diff options
| -rw-r--r-- | features/aufs/aufs-bugfix-opts-Fix-missing-break-statement.patch | 32 | ||||
| -rw-r--r-- | features/aufs/aufs-opts-Fix-missing-fallthrough.patch | 43 | ||||
| -rw-r--r-- | features/aufs/aufs.scc | 9 | ||||
| -rw-r--r-- | features/aufs/aufs5-base-support.patch | 345 | ||||
| -rw-r--r-- | features/aufs/aufs5-core-support.patch | 38587 | ||||
| -rw-r--r-- | features/aufs/aufs5-fix-build-on-v5.3.patch | 30 | ||||
| -rw-r--r-- | features/aufs/aufs5-kbuild-support.patch | 37 | ||||
| -rw-r--r-- | features/aufs/aufs5-mmap-support.patch | 422 | ||||
| -rw-r--r-- | features/aufs/aufs5-standalone-support.patch | 397 | ||||
| -rw-r--r-- | features/perf/perf-force-include-of-stdbool.h.patch | 17 | ||||
| -rw-r--r-- | kver | 2 | ||||
| -rw-r--r-- | patches/misc/linux-yocto-Handle-bin-awk-issues.patch | 22 |
12 files changed, 10 insertions, 39933 deletions
diff --git a/features/aufs/aufs-bugfix-opts-Fix-missing-break-statement.patch b/features/aufs/aufs-bugfix-opts-Fix-missing-break-statement.patch deleted file mode 100644 index 7313d14d..00000000 --- a/features/aufs/aufs-bugfix-opts-Fix-missing-break-statement.patch +++ /dev/null @@ -1,32 +0,0 @@ -From 36d415080900e558b30c312c93c5ffcaab996682 Mon Sep 17 00:00:00 2001 -From: He Zhe <zhe.he@windriver.com> -Date: Tue, 3 Sep 2019 15:28:03 +0800 -Subject: [PATCH 1/2] aufs: bugfix, opts: Fix missing break statement - -commit 4a80018d718f6be2e862d0c70bb11cd6e6d1fae5 upstream - -Add missing break statement for case Opt_wsum in au_opt_simple. - -Signed-off-by: He Zhe <zhe.he@windriver.com> -See-also: https://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg05684.html -(cherry picked from commit 9e7d29356ab57fa5db7e92e51267176e50c1497c) -Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> ---- - fs/aufs/opts.c | 1 + - 1 file changed, 1 insertion(+) - -diff --git a/fs/aufs/opts.c b/fs/aufs/opts.c -index c92ca14574ff..a825549c029a 100644 ---- a/fs/aufs/opts.c -+++ b/fs/aufs/opts.c -@@ -1386,6 +1386,7 @@ static int au_opt_simple(struct super_block *sb, struct au_opt *opt, - case Opt_wsum: - au_opt_clr(sbinfo->si_mntflags, SUM); - au_opt_set(sbinfo->si_mntflags, SUM_W); -+ break; - case Opt_nosum: - au_opt_clr(sbinfo->si_mntflags, SUM); - au_opt_clr(sbinfo->si_mntflags, SUM_W); --- -2.19.1 - diff --git a/features/aufs/aufs-opts-Fix-missing-fallthrough.patch b/features/aufs/aufs-opts-Fix-missing-fallthrough.patch deleted file mode 100644 index 31ddf1f9..00000000 --- a/features/aufs/aufs-opts-Fix-missing-fallthrough.patch +++ /dev/null @@ -1,43 +0,0 @@ -From eb303f5dab8100336ca7619d99591b5ed98d01cb Mon Sep 17 00:00:00 2001 -From: He Zhe <zhe.he@windriver.com> -Date: Tue, 3 Sep 2019 15:28:04 +0800 -Subject: [PATCH 2/2] aufs: opts: Fix missing fallthrough - -commit 8d7b6374d5af2c31ce9501d3502808e3c7a9ea68 upstream - -A compilation -Wimplicit-fallthrough warning was enabled by commit -a035d552a93b ("Makefile: Globally enable fall-through warning") -and triggers the following warning. - -fs/aufs/opts.h:78:11: -warning: this statement may fall through [-Wimplicit-fallthrough=] - -This patch adds comments according GNU manual. -https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#Warning-Options - -Signed-off-by: He Zhe <zhe.he@windriver.com> -See-also: https://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg05685.html -(cherry picked from commit e7619996b014c5d8fd2f6ad89542c545a207667f) -Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> ---- - fs/aufs/opts.c | 2 ++ - 1 file changed, 2 insertions(+) - -diff --git a/fs/aufs/opts.c b/fs/aufs/opts.c -index a825549c029a..77e17d7b3bdf 100644 ---- a/fs/aufs/opts.c -+++ b/fs/aufs/opts.c -@@ -1512,8 +1512,10 @@ static int au_opt_br(struct super_block *sb, struct au_opt *opt, - if (opt->add.bindex < 0) - opt->add.bindex = 0; - goto add; -+ /* Always goto add, not fallthrough */ - case Opt_prepend: - opt->add.bindex = 0; -+ /* fallthrough */ - add: /* indented label */ - case Opt_add: - err = au_br_add(sb, &opt->add, --- -2.19.1 - diff --git a/features/aufs/aufs.scc b/features/aufs/aufs.scc index e919b07a..e084ec60 100644 --- a/features/aufs/aufs.scc +++ b/features/aufs/aufs.scc @@ -1,9 +1,2 @@ # SPDX-License-Identifier: MIT -patch aufs5-kbuild-support.patch -patch aufs5-base-support.patch -patch aufs5-mmap-support.patch -patch aufs5-standalone-support.patch -patch aufs5-core-support.patch -patch aufs5-fix-build-on-v5.3.patch -patch aufs-bugfix-opts-Fix-missing-break-statement.patch -patch aufs-opts-Fix-missing-fallthrough.patch +# diff --git a/features/aufs/aufs5-base-support.patch b/features/aufs/aufs5-base-support.patch deleted file mode 100644 index 337222de..00000000 --- a/features/aufs/aufs5-base-support.patch +++ /dev/null @@ -1,345 +0,0 @@ -From c622fca67954cced819fe38247f8ff2aa75814f1 Mon Sep 17 00:00:00 2001 -From: Bruce Ashfield <bruce.ashfield@gmail.com> -Date: Wed, 3 Jul 2019 10:54:31 -0400 -Subject: [PATCH 2/5] aufs5: base support - -Application of aufs5-base.patch - -Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> ---- - MAINTAINERS | 13 +++++++++++++ - drivers/block/loop.c | 18 ++++++++++++++++++ - fs/dcache.c | 2 +- - fs/fcntl.c | 4 +++- - fs/inode.c | 2 +- - fs/namespace.c | 6 ++++++ - fs/read_write.c | 22 ++++++++++++++++++++++ - fs/splice.c | 10 +++++----- - fs/sync.c | 2 +- - include/linux/fs.h | 10 ++++++++++ - include/linux/lockdep.h | 3 +++ - include/linux/mnt_namespace.h | 3 +++ - include/linux/splice.h | 6 ++++++ - kernel/locking/lockdep.c | 3 ++- - 14 files changed, 94 insertions(+), 10 deletions(-) - -diff --git a/MAINTAINERS b/MAINTAINERS -index 01a52fc964da..abf52c12b830 100644 ---- a/MAINTAINERS -+++ b/MAINTAINERS -@@ -2769,6 +2769,19 @@ F: include/linux/audit.h - F: include/uapi/linux/audit.h - F: kernel/audit* - -+AUFS (advanced multi layered unification filesystem) FILESYSTEM -+M: "J. R. Okajima" <hooanon05g@gmail.com> -+L: aufs-users@lists.sourceforge.net (members only) -+L: linux-unionfs@vger.kernel.org -+W: http://aufs.sourceforge.net -+T: git://github.com/sfjro/aufs4-linux.git -+S: Supported -+F: Documentation/filesystems/aufs/ -+F: Documentation/ABI/testing/debugfs-aufs -+F: Documentation/ABI/testing/sysfs-aufs -+F: fs/aufs/ -+F: include/uapi/linux/aufs_type.h -+ - AUXILIARY DISPLAY DRIVERS - M: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com> - S: Maintained -diff --git a/drivers/block/loop.c b/drivers/block/loop.c -index f11b7dc16e9d..1b723737592b 100644 ---- a/drivers/block/loop.c -+++ b/drivers/block/loop.c -@@ -746,6 +746,24 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, - return error; - } - -+/* -+ * for AUFS -+ * no get/put for file. -+ */ -+struct file *loop_backing_file(struct super_block *sb) -+{ -+ struct file *ret; -+ struct loop_device *l; -+ -+ ret = NULL; -+ if (MAJOR(sb->s_dev) == LOOP_MAJOR) { -+ l = sb->s_bdev->bd_disk->private_data; -+ ret = l->lo_backing_file; -+ } -+ return ret; -+} -+EXPORT_SYMBOL_GPL(loop_backing_file); -+ - /* loop sysfs attributes */ - - static ssize_t loop_attr_show(struct device *dev, char *page, -diff --git a/fs/dcache.c b/fs/dcache.c -index c435398f2c81..a688a042d022 100644 ---- a/fs/dcache.c -+++ b/fs/dcache.c -@@ -1247,7 +1247,7 @@ enum d_walk_ret { - * - * The @enter() callbacks are called with d_lock held. - */ --static void d_walk(struct dentry *parent, void *data, -+void d_walk(struct dentry *parent, void *data, - enum d_walk_ret (*enter)(void *, struct dentry *)) - { - struct dentry *this_parent; -diff --git a/fs/fcntl.c b/fs/fcntl.c -index 3d40771e8e7c..d62303c5472a 100644 ---- a/fs/fcntl.c -+++ b/fs/fcntl.c -@@ -32,7 +32,7 @@ - - #define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME) - --static int setfl(int fd, struct file * filp, unsigned long arg) -+int setfl(int fd, struct file * filp, unsigned long arg) - { - struct inode * inode = file_inode(filp); - int error = 0; -@@ -63,6 +63,8 @@ static int setfl(int fd, struct file * filp, unsigned long arg) - - if (filp->f_op->check_flags) - error = filp->f_op->check_flags(arg); -+ if (!error && filp->f_op->setfl) -+ error = filp->f_op->setfl(filp, arg); - if (error) - return error; - -diff --git a/fs/inode.c b/fs/inode.c -index 2bf21e2c90fc..9b908c37971f 100644 ---- a/fs/inode.c -+++ b/fs/inode.c -@@ -1670,7 +1670,7 @@ EXPORT_SYMBOL(generic_update_time); - * This does the actual work of updating an inodes time or version. Must have - * had called mnt_want_write() before calling this. - */ --static int update_time(struct inode *inode, struct timespec64 *time, int flags) -+int update_time(struct inode *inode, struct timespec64 *time, int flags) - { - int (*update_time)(struct inode *, struct timespec64 *, int); - -diff --git a/fs/namespace.c b/fs/namespace.c -index 7660c2749c96..d6e9681f044d 100644 ---- a/fs/namespace.c -+++ b/fs/namespace.c -@@ -770,6 +770,12 @@ static inline int check_mnt(struct mount *mnt) - return mnt->mnt_ns == current->nsproxy->mnt_ns; - } - -+/* for aufs, CONFIG_AUFS_BR_FUSE */ -+int is_current_mnt_ns(struct vfsmount *mnt) -+{ -+ return check_mnt(real_mount(mnt)); -+} -+ - /* - * vfsmount lock must be held for write - */ -diff --git a/fs/read_write.c b/fs/read_write.c -index c543d965e288..35ab54e0a994 100644 ---- a/fs/read_write.c -+++ b/fs/read_write.c -@@ -498,6 +498,28 @@ static ssize_t __vfs_write(struct file *file, const char __user *p, - return -EINVAL; - } - -+vfs_readf_t vfs_readf(struct file *file) -+{ -+ const struct file_operations *fop = file->f_op; -+ -+ if (fop->read) -+ return fop->read; -+ if (fop->read_iter) -+ return new_sync_read; -+ return ERR_PTR(-ENOSYS); -+} -+ -+vfs_writef_t vfs_writef(struct file *file) -+{ -+ const struct file_operations *fop = file->f_op; -+ -+ if (fop->write) -+ return fop->write; -+ if (fop->write_iter) -+ return new_sync_write; -+ return ERR_PTR(-ENOSYS); -+} -+ - ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos) - { - mm_segment_t old_fs; -diff --git a/fs/splice.c b/fs/splice.c -index 14cb602d9a2f..58d2692c5f30 100644 ---- a/fs/splice.c -+++ b/fs/splice.c -@@ -834,8 +834,8 @@ EXPORT_SYMBOL(generic_splice_sendpage); - /* - * Attempt to initiate a splice from pipe to file. - */ --static long do_splice_from(struct pipe_inode_info *pipe, struct file *out, -- loff_t *ppos, size_t len, unsigned int flags) -+long do_splice_from(struct pipe_inode_info *pipe, struct file *out, -+ loff_t *ppos, size_t len, unsigned int flags) - { - ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, - loff_t *, size_t, unsigned int); -@@ -851,9 +851,9 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out, - /* - * Attempt to initiate a splice from a file to a pipe. - */ --static long do_splice_to(struct file *in, loff_t *ppos, -- struct pipe_inode_info *pipe, size_t len, -- unsigned int flags) -+long do_splice_to(struct file *in, loff_t *ppos, -+ struct pipe_inode_info *pipe, size_t len, -+ unsigned int flags) - { - ssize_t (*splice_read)(struct file *, loff_t *, - struct pipe_inode_info *, size_t, unsigned int); -diff --git a/fs/sync.c b/fs/sync.c -index 4d1ff010bc5a..457f4e4a5cc1 100644 ---- a/fs/sync.c -+++ b/fs/sync.c -@@ -28,7 +28,7 @@ - * wait == 1 case since in that case write_inode() functions do - * sync_dirty_buffer() and thus effectively write one block at a time. - */ --static int __sync_filesystem(struct super_block *sb, int wait) -+int __sync_filesystem(struct super_block *sb, int wait) - { - if (wait) - sync_inodes_sb(sb); -diff --git a/include/linux/fs.h b/include/linux/fs.h -index f7fdfe93e25d..28593b894e7b 100644 ---- a/include/linux/fs.h -+++ b/include/linux/fs.h -@@ -1333,6 +1333,7 @@ extern void fasync_free(struct fasync_struct *); - /* can be called from interrupts */ - extern void kill_fasync(struct fasync_struct **, int, int); - -+extern int setfl(int fd, struct file * filp, unsigned long arg); - extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force); - extern int f_setown(struct file *filp, unsigned long arg, int force); - extern void f_delown(struct file *filp); -@@ -1812,6 +1813,7 @@ struct file_operations { - ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); - unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); - int (*check_flags)(int); -+ int (*setfl)(struct file *, unsigned long); - int (*flock) (struct file *, int, struct file_lock *); - ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); - ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); -@@ -1882,6 +1884,12 @@ ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, - struct iovec *fast_pointer, - struct iovec **ret_pointer); - -+typedef ssize_t (*vfs_readf_t)(struct file *, char __user *, size_t, loff_t *); -+typedef ssize_t (*vfs_writef_t)(struct file *, const char __user *, size_t, -+ loff_t *); -+vfs_readf_t vfs_readf(struct file *file); -+vfs_writef_t vfs_writef(struct file *file); -+ - extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *); - extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); - extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); -@@ -2315,6 +2323,7 @@ extern int current_umask(void); - extern void ihold(struct inode * inode); - extern void iput(struct inode *); - extern int generic_update_time(struct inode *, struct timespec64 *, int); -+extern int update_time(struct inode *, struct timespec64 *, int); - - /* /sys/fs */ - extern struct kobject *fs_kobj; -@@ -2603,6 +2612,7 @@ static inline bool sb_is_blkdev_sb(struct super_block *sb) - return false; - } - #endif -+extern int __sync_filesystem(struct super_block *, int); - extern int sync_filesystem(struct super_block *); - extern const struct file_operations def_blk_fops; - extern const struct file_operations def_chr_fops; -diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h -index 6e2377e6c1d6..5a945d18a72a 100644 ---- a/include/linux/lockdep.h -+++ b/include/linux/lockdep.h -@@ -325,6 +325,8 @@ static inline int lockdep_match_key(struct lockdep_map *lock, - return lock->key == key; - } - -+struct lock_class *lockdep_hlock_class(struct held_lock *hlock); -+ - /* - * Acquire a lock. - * -@@ -463,6 +465,7 @@ struct lockdep_map { }; - - #define lockdep_depth(tsk) (0) - -+#define lockdep_is_held(lock) (1) - #define lockdep_is_held_type(l, r) (1) - - #define lockdep_assert_held(l) do { (void)(l); } while (0) -diff --git a/include/linux/mnt_namespace.h b/include/linux/mnt_namespace.h -index 35942084cd40..24f5fd1a789d 100644 ---- a/include/linux/mnt_namespace.h -+++ b/include/linux/mnt_namespace.h -@@ -6,11 +6,14 @@ - struct mnt_namespace; - struct fs_struct; - struct user_namespace; -+struct vfsmount; - - extern struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *, - struct user_namespace *, struct fs_struct *); - extern void put_mnt_ns(struct mnt_namespace *ns); - -+extern int is_current_mnt_ns(struct vfsmount *mnt); -+ - extern const struct file_operations proc_mounts_operations; - extern const struct file_operations proc_mountinfo_operations; - extern const struct file_operations proc_mountstats_operations; -diff --git a/include/linux/splice.h b/include/linux/splice.h -index 74b4911ac16d..19789fbea567 100644 ---- a/include/linux/splice.h -+++ b/include/linux/splice.h -@@ -87,4 +87,10 @@ extern void splice_shrink_spd(struct splice_pipe_desc *); - - extern const struct pipe_buf_operations page_cache_pipe_buf_ops; - extern const struct pipe_buf_operations default_pipe_buf_ops; -+ -+extern long do_splice_from(struct pipe_inode_info *pipe, struct file *out, -+ loff_t *ppos, size_t len, unsigned int flags); -+extern long do_splice_to(struct file *in, loff_t *ppos, -+ struct pipe_inode_info *pipe, size_t len, -+ unsigned int flags); - #endif -diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c -index c47788fa85f9..3c35a1059890 100644 ---- a/kernel/locking/lockdep.c -+++ b/kernel/locking/lockdep.c -@@ -152,7 +152,7 @@ static - #endif - struct lock_class lock_classes[MAX_LOCKDEP_KEYS]; - --static inline struct lock_class *hlock_class(struct held_lock *hlock) -+inline struct lock_class *lockdep_hlock_class(struct held_lock *hlock) - { - if (!hlock->class_idx) { - /* -@@ -163,6 +163,7 @@ static inline struct lock_class *hlock_class(struct held_lock *hlock) - } - return lock_classes + hlock->class_idx - 1; - } -+#define hlock_class(hlock) lockdep_hlock_class(hlock) - - #ifdef CONFIG_LOCK_STAT - static DEFINE_PER_CPU(struct lock_class_stats[MAX_LOCKDEP_KEYS], cpu_lock_stats); --- -2.19.1 - diff --git a/features/aufs/aufs5-core-support.patch b/features/aufs/aufs5-core-support.patch deleted file mode 100644 index 1f772d06..00000000 --- a/features/aufs/aufs5-core-support.patch +++ /dev/null @@ -1,38587 +0,0 @@ -From 8880af69d321a901f1c728e0d9c8fabaf97c7fd1 Mon Sep 17 00:00:00 2001 -From: Bruce Ashfield <bruce.ashfield@gmail.com> -Date: Wed, 3 Jul 2019 10:56:53 -0400 -Subject: [PATCH 5/5] aufs5: core support - -Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> ---- - Documentation/ABI/testing/debugfs-aufs | 55 + - Documentation/ABI/testing/sysfs-aufs | 31 + - Documentation/filesystems/aufs/README | 399 ++++ - .../filesystems/aufs/design/01intro.txt | 171 ++ - .../filesystems/aufs/design/02struct.txt | 258 +++ - .../filesystems/aufs/design/03atomic_open.txt | 85 + - .../filesystems/aufs/design/03lookup.txt | 113 + - .../filesystems/aufs/design/04branch.txt | 74 + - .../filesystems/aufs/design/05wbr_policy.txt | 64 + - .../filesystems/aufs/design/06dirren.dot | 31 + - .../filesystems/aufs/design/06dirren.txt | 102 + - .../filesystems/aufs/design/06fhsm.txt | 120 + - .../filesystems/aufs/design/06mmap.txt | 72 + - .../filesystems/aufs/design/06xattr.txt | 96 + - .../filesystems/aufs/design/07export.txt | 58 + - .../filesystems/aufs/design/08shwh.txt | 52 + - .../filesystems/aufs/design/10dynop.txt | 47 + - fs/aufs/Kconfig | 199 ++ - fs/aufs/Makefile | 46 + - fs/aufs/aufs.h | 62 + - fs/aufs/branch.c | 1423 ++++++++++++ - fs/aufs/branch.h | 366 +++ - fs/aufs/conf.mk | 40 + - fs/aufs/cpup.c | 1458 ++++++++++++ - fs/aufs/cpup.h | 100 + - fs/aufs/dbgaufs.c | 526 +++++ - fs/aufs/dbgaufs.h | 53 + - fs/aufs/dcsub.c | 225 ++ - fs/aufs/dcsub.h | 137 ++ - fs/aufs/debug.c | 441 ++++ - fs/aufs/debug.h | 226 ++ - fs/aufs/dentry.c | 1154 ++++++++++ - fs/aufs/dentry.h | 268 +++ - fs/aufs/dinfo.c | 554 +++++ - fs/aufs/dir.c | 763 +++++++ - fs/aufs/dir.h | 134 ++ - fs/aufs/dirren.c | 1316 +++++++++++ - fs/aufs/dirren.h | 140 ++ - fs/aufs/dynop.c | 367 +++ - fs/aufs/dynop.h | 77 + - fs/aufs/export.c | 838 +++++++ - fs/aufs/f_op.c | 819 +++++++ - fs/aufs/fhsm.c | 427 ++++ - fs/aufs/file.c | 863 ++++++++ - fs/aufs/file.h | 342 +++ - fs/aufs/finfo.c | 149 ++ - fs/aufs/fstype.h | 401 ++++ - fs/aufs/hbl.h | 65 + - fs/aufs/hfsnotify.c | 288 +++ - fs/aufs/hfsplus.c | 60 + - fs/aufs/hnotify.c | 721 ++++++ - fs/aufs/i_op.c | 1507 +++++++++++++ - fs/aufs/i_op_add.c | 936 ++++++++ - fs/aufs/i_op_del.c | 513 +++++ - fs/aufs/i_op_ren.c | 1250 +++++++++++ - fs/aufs/iinfo.c | 286 +++ - fs/aufs/inode.c | 529 +++++ - fs/aufs/inode.h | 698 ++++++ - fs/aufs/ioctl.c | 220 ++ - fs/aufs/lcnt.h | 186 ++ - fs/aufs/loop.c | 148 ++ - fs/aufs/loop.h | 55 + - fs/aufs/magic.mk | 31 + - fs/aufs/module.c | 273 +++ - fs/aufs/module.h | 166 ++ - fs/aufs/mvdown.c | 706 ++++++ - fs/aufs/opts.c | 1877 ++++++++++++++++ - fs/aufs/opts.h | 225 ++ - fs/aufs/plink.c | 516 +++++ - fs/aufs/poll.c | 51 + - fs/aufs/posix_acl.c | 103 + - fs/aufs/procfs.c | 171 ++ - fs/aufs/rdu.c | 384 ++++ - fs/aufs/rwsem.h | 73 + - fs/aufs/sbinfo.c | 314 +++ - fs/aufs/super.c | 1047 +++++++++ - fs/aufs/super.h | 589 +++++ - fs/aufs/sysaufs.c | 93 + - fs/aufs/sysaufs.h | 102 + - fs/aufs/sysfs.c | 374 ++++ - fs/aufs/sysrq.c | 160 ++ - fs/aufs/vdir.c | 896 ++++++++ - fs/aufs/vfsub.c | 902 ++++++++ - fs/aufs/vfsub.h | 354 +++ - fs/aufs/wbr_policy.c | 830 +++++++ - fs/aufs/whout.c | 1062 +++++++++ - fs/aufs/whout.h | 86 + - fs/aufs/wkq.c | 392 ++++ - fs/aufs/wkq.h | 89 + - fs/aufs/xattr.c | 356 +++ - fs/aufs/xino.c | 1965 +++++++++++++++++ - include/uapi/linux/aufs_type.h | 448 ++++ - 92 files changed, 37839 insertions(+) - create mode 100644 Documentation/ABI/testing/debugfs-aufs - create mode 100644 Documentation/ABI/testing/sysfs-aufs - create mode 100644 Documentation/filesystems/aufs/README - create mode 100644 Documentation/filesystems/aufs/design/01intro.txt - create mode 100644 Documentation/filesystems/aufs/design/02struct.txt - create mode 100644 Documentation/filesystems/aufs/design/03atomic_open.txt - create mode 100644 Documentation/filesystems/aufs/design/03lookup.txt - create mode 100644 Documentation/filesystems/aufs/design/04branch.txt - create mode 100644 Documentation/filesystems/aufs/design/05wbr_policy.txt - create mode 100644 Documentation/filesystems/aufs/design/06dirren.dot - create mode 100644 Documentation/filesystems/aufs/design/06dirren.txt - create mode 100644 Documentation/filesystems/aufs/design/06fhsm.txt - create mode 100644 Documentation/filesystems/aufs/design/06mmap.txt - create mode 100644 Documentation/filesystems/aufs/design/06xattr.txt - create mode 100644 Documentation/filesystems/aufs/design/07export.txt - create mode 100644 Documentation/filesystems/aufs/design/08shwh.txt - create mode 100644 Documentation/filesystems/aufs/design/10dynop.txt - create mode 100644 fs/aufs/Kconfig - create mode 100644 fs/aufs/Makefile - create mode 100644 fs/aufs/aufs.h - create mode 100644 fs/aufs/branch.c - create mode 100644 fs/aufs/branch.h - create mode 100644 fs/aufs/conf.mk - create mode 100644 fs/aufs/cpup.c - create mode 100644 fs/aufs/cpup.h - create mode 100644 fs/aufs/dbgaufs.c - create mode 100644 fs/aufs/dbgaufs.h - create mode 100644 fs/aufs/dcsub.c - create mode 100644 fs/aufs/dcsub.h - create mode 100644 fs/aufs/debug.c - create mode 100644 fs/aufs/debug.h - create mode 100644 fs/aufs/dentry.c - create mode 100644 fs/aufs/dentry.h - create mode 100644 fs/aufs/dinfo.c - create mode 100644 fs/aufs/dir.c - create mode 100644 fs/aufs/dir.h - create mode 100644 fs/aufs/dirren.c - create mode 100644 fs/aufs/dirren.h - create mode 100644 fs/aufs/dynop.c - create mode 100644 fs/aufs/dynop.h - create mode 100644 fs/aufs/export.c - create mode 100644 fs/aufs/f_op.c - create mode 100644 fs/aufs/fhsm.c - create mode 100644 fs/aufs/file.c - create mode 100644 fs/aufs/file.h - create mode 100644 fs/aufs/finfo.c - create mode 100644 fs/aufs/fstype.h - create mode 100644 fs/aufs/hbl.h - create mode 100644 fs/aufs/hfsnotify.c - create mode 100644 fs/aufs/hfsplus.c - create mode 100644 fs/aufs/hnotify.c - create mode 100644 fs/aufs/i_op.c - create mode 100644 fs/aufs/i_op_add.c - create mode 100644 fs/aufs/i_op_del.c - create mode 100644 fs/aufs/i_op_ren.c - create mode 100644 fs/aufs/iinfo.c - create mode 100644 fs/aufs/inode.c - create mode 100644 fs/aufs/inode.h - create mode 100644 fs/aufs/ioctl.c - create mode 100644 fs/aufs/lcnt.h - create mode 100644 fs/aufs/loop.c - create mode 100644 fs/aufs/loop.h - create mode 100644 fs/aufs/magic.mk - create mode 100644 fs/aufs/module.c - create mode 100644 fs/aufs/module.h - create mode 100644 fs/aufs/mvdown.c - create mode 100644 fs/aufs/opts.c - create mode 100644 fs/aufs/opts.h - create mode 100644 fs/aufs/plink.c - create mode 100644 fs/aufs/poll.c - create mode 100644 fs/aufs/posix_acl.c - create mode 100644 fs/aufs/procfs.c - create mode 100644 fs/aufs/rdu.c - create mode 100644 fs/aufs/rwsem.h - create mode 100644 fs/aufs/sbinfo.c - create mode 100644 fs/aufs/super.c - create mode 100644 fs/aufs/super.h - create mode 100644 fs/aufs/sysaufs.c - create mode 100644 fs/aufs/sysaufs.h - create mode 100644 fs/aufs/sysfs.c - create mode 100644 fs/aufs/sysrq.c - create mode 100644 fs/aufs/vdir.c - create mode 100644 fs/aufs/vfsub.c - create mode 100644 fs/aufs/vfsub.h - create mode 100644 fs/aufs/wbr_policy.c - create mode 100644 fs/aufs/whout.c - create mode 100644 fs/aufs/whout.h - create mode 100644 fs/aufs/wkq.c - create mode 100644 fs/aufs/wkq.h - create mode 100644 fs/aufs/xattr.c - create mode 100644 fs/aufs/xino.c - create mode 100644 include/uapi/linux/aufs_type.h - -diff --git a/Documentation/ABI/testing/debugfs-aufs b/Documentation/ABI/testing/debugfs-aufs -new file mode 100644 -index 000000000000..4a6694194ba6 ---- /dev/null -+++ b/Documentation/ABI/testing/debugfs-aufs -@@ -0,0 +1,55 @@ -+What: /debug/aufs/si_<id>/ -+Date: March 2009 -+Contact: J. R. Okajima <hooanon05g@gmail.com> -+Description: -+ Under /debug/aufs, a directory named si_<id> is created -+ per aufs mount, where <id> is a unique id generated -+ internally. -+ -+What: /debug/aufs/si_<id>/plink -+Date: Apr 2013 -+Contact: J. R. Okajima <hooanon05g@gmail.com> -+Description: -+ It has three lines and shows the information about the -+ pseudo-link. The first line is a single number -+ representing a number of buckets. The second line is a -+ number of pseudo-links per buckets (separated by a -+ blank). The last line is a single number representing a -+ total number of psedo-links. -+ When the aufs mount option 'noplink' is specified, it -+ will show "1\n0\n0\n". -+ -+What: /debug/aufs/si_<id>/xib -+Date: March 2009 -+Contact: J. R. Okajima <hooanon05g@gmail.com> -+Description: -+ It shows the consumed blocks by xib (External Inode Number -+ Bitmap), its block size and file size. -+ When the aufs mount option 'noxino' is specified, it -+ will be empty. About XINO files, see the aufs manual. -+ -+What: /debug/aufs/si_<id>/xi0, xi1 ... xiN and xiN-N -+Date: March 2009 -+Contact: J. R. Okajima <hooanon05g@gmail.com> -+Description: -+ It shows the consumed blocks by xino (External Inode Number -+ Translation Table), its link count, block size and file -+ size. -+ Due to the file size limit, there may exist multiple -+ xino files per branch. In this case, "-N" is added to -+ the filename and it corresponds to the index of the -+ internal xino array. "-0" is omitted. -+ When the aufs mount option 'noxino' is specified, Those -+ entries won't exist. About XINO files, see the aufs -+ manual. -+ -+What: /debug/aufs/si_<id>/xigen -+Date: March 2009 -+Contact: J. R. Okajima <hooanon05g@gmail.com> -+Description: -+ It shows the consumed blocks by xigen (External Inode -+ Generation Table), its block size and file size. -+ If CONFIG_AUFS_EXPORT is disabled, this entry will not -+ be created. -+ When the aufs mount option 'noxino' is specified, it -+ will be empty. About XINO files, see the aufs manual. -diff --git a/Documentation/ABI/testing/sysfs-aufs b/Documentation/ABI/testing/sysfs-aufs -new file mode 100644 -index 000000000000..82f9518495ea ---- /dev/null -+++ b/Documentation/ABI/testing/sysfs-aufs -@@ -0,0 +1,31 @@ -+What: /sys/fs/aufs/si_<id>/ -+Date: March 2009 -+Contact: J. R. Okajima <hooanon05g@gmail.com> -+Description: -+ Under /sys/fs/aufs, a directory named si_<id> is created -+ per aufs mount, where <id> is a unique id generated -+ internally. -+ -+What: /sys/fs/aufs/si_<id>/br0, br1 ... brN -+Date: March 2009 -+Contact: J. R. Okajima <hooanon05g@gmail.com> -+Description: -+ It shows the abolute path of a member directory (which -+ is called branch) in aufs, and its permission. -+ -+What: /sys/fs/aufs/si_<id>/brid0, brid1 ... bridN -+Date: July 2013 -+Contact: J. R. Okajima <hooanon05g@gmail.com> -+Description: -+ It shows the id of a member directory (which is called -+ branch) in aufs. -+ -+What: /sys/fs/aufs/si_<id>/xi_path -+Date: March 2009 -+Contact: J. R. Okajima <hooanon05g@gmail.com> -+Description: -+ It shows the abolute path of XINO (External Inode Number -+ Bitmap, Translation Table and Generation Table) file -+ even if it is the default path. -+ When the aufs mount option 'noxino' is specified, it -+ will be empty. About XINO files, see the aufs manual. -diff --git a/Documentation/filesystems/aufs/README b/Documentation/filesystems/aufs/README -new file mode 100644 -index 000000000000..6e6774fbf602 ---- /dev/null -+++ b/Documentation/filesystems/aufs/README -@@ -0,0 +1,399 @@ -+ -+Aufs5 -- advanced multi layered unification filesystem version 5.x -+http://aufs.sf.net -+Junjiro R. Okajima -+ -+ -+0. Introduction -+---------------------------------------- -+In the early days, aufs was entirely re-designed and re-implemented -+Unionfs Version 1.x series. Adding many original ideas, approaches, -+improvements and implementations, it became totally different from -+Unionfs while keeping the basic features. -+Later, Unionfs Version 2.x series began taking some of the same -+approaches to aufs1's. -+Unionfs was being developed by Professor Erez Zadok at Stony Brook -+University and his team. -+ -+Aufs5 supports linux-v5.0 and later, If you want older kernel version -+support, -+- for linux-v4.x series, try aufs4-linux.git or aufs4-standalone.git -+- for linux-v3.x series, try aufs3-linux.git or aufs3-standalone.git -+- for linux-v2.6.16 and later, try aufs2-2.6.git, aufs2-standalone.git -+ or aufs1 from CVS on SourceForge. -+ -+Note: it becomes clear that "Aufs was rejected. Let's give it up." -+ According to Christoph Hellwig, linux rejects all union-type -+ filesystems but UnionMount. -+<http://marc.info/?l=linux-kernel&m=123938533724484&w=2> -+ -+PS. Al Viro seems have a plan to merge aufs as well as overlayfs and -+ UnionMount, and he pointed out an issue around a directory mutex -+ lock and aufs addressed it. But it is still unsure whether aufs will -+ be merged (or any other union solution). -+<http://marc.info/?l=linux-kernel&m=136312705029295&w=1> -+ -+ -+1. Features -+---------------------------------------- -+- unite several directories into a single virtual filesystem. The member -+ directory is called as a branch. -+- you can specify the permission flags to the branch, which are 'readonly', -+ 'readwrite' and 'whiteout-able.' -+- by upper writable branch, internal copyup and whiteout, files/dirs on -+ readonly branch are modifiable logically. -+- dynamic branch manipulation, add, del. -+- etc... -+ -+Also there are many enhancements in aufs, such as: -+- test only the highest one for the directory permission (dirperm1) -+- copyup on open (coo=) -+- 'move' policy for copy-up between two writable branches, after -+ checking free space. -+- xattr, acl -+- readdir(3) in userspace. -+- keep inode number by external inode number table -+- keep the timestamps of file/dir in internal copyup operation -+- seekable directory, supporting NFS readdir. -+- whiteout is hardlinked in order to reduce the consumption of inodes -+ on branch -+- do not copyup, nor create a whiteout when it is unnecessary -+- revert a single systemcall when an error occurs in aufs -+- remount interface instead of ioctl -+- maintain /etc/mtab by an external command, /sbin/mount.aufs. -+- loopback mounted filesystem as a branch -+- kernel thread for removing the dir who has a plenty of whiteouts -+- support copyup sparse file (a file which has a 'hole' in it) -+- default permission flags for branches -+- selectable permission flags for ro branch, whether whiteout can -+ exist or not -+- export via NFS. -+- support <sysfs>/fs/aufs and <debugfs>/aufs. -+- support multiple writable branches, some policies to select one -+ among multiple writable branches. -+- a new semantics for link(2) and rename(2) to support multiple -+ writable branches. -+- no glibc changes are required. -+- pseudo hardlink (hardlink over branches) -+- allow a direct access manually to a file on branch, e.g. bypassing aufs. -+ including NFS or remote filesystem branch. -+- userspace wrapper for pathconf(3)/fpathconf(3) with _PC_LINK_MAX. -+- and more... -+ -+Currently these features are dropped temporary from aufs5. -+See design/08plan.txt in detail. -+- nested mount, i.e. aufs as readonly no-whiteout branch of another aufs -+ (robr) -+- statistics of aufs thread (/sys/fs/aufs/stat) -+ -+Features or just an idea in the future (see also design/*.txt), -+- reorder the branch index without del/re-add. -+- permanent xino files for NFSD -+- an option for refreshing the opened files after add/del branches -+- light version, without branch manipulation. (unnecessary?) -+- copyup in userspace -+- inotify in userspace -+- readv/writev -+ -+ -+2. Download -+---------------------------------------- -+There are three GIT trees for aufs5, aufs5-linux.git, -+aufs5-standalone.git, and aufs-util.git. Note that there is no "5" in -+"aufs-util.git." -+While the aufs-util is always necessary, you need either of aufs5-linux -+or aufs5-standalone. -+ -+The aufs5-linux tree includes the whole linux mainline GIT tree, -+git://git.kernel.org/.../torvalds/linux.git. -+And you cannot select CONFIG_AUFS_FS=m for this version, eg. you cannot -+build aufs5 as an external kernel module. -+Several extra patches are not included in this tree. Only -+aufs5-standalone tree contains them. They are described in the later -+section "Configuration and Compilation." -+ -+On the other hand, the aufs5-standalone tree has only aufs source files -+and necessary patches, and you can select CONFIG_AUFS_FS=m. -+But you need to apply all aufs patches manually. -+ -+You will find GIT branches whose name is in form of "aufs5.x" where "x" -+represents the linux kernel version, "linux-5.x". For instance, -+"aufs5.0" is for linux-5.0. For latest "linux-5.x-rcN", use -+"aufs5.x-rcN" branch. -+ -+o aufs5-linux tree -+$ git clone --reference /your/linux/git/tree \ -+ git://github.com/sfjro/aufs5-linux.git aufs5-linux.git -+- if you don't have linux GIT tree, then remove "--reference ..." -+$ cd aufs5-linux.git -+$ git checkout origin/aufs5.0 -+ -+Or You may want to directly git-pull aufs into your linux GIT tree, and -+leave the patch-work to GIT. -+$ cd /your/linux/git/tree -+$ git remote add aufs5 git://github.com/sfjro/aufs5-linux.git -+$ git fetch aufs5 -+$ git checkout -b my5.0 v5.0 -+$ (add your local change...) -+$ git pull aufs5 aufs5.0 -+- now you have v5.0 + your_changes + aufs5.0 in you my5.0 branch. -+- you may need to solve some conflicts between your_changes and -+ aufs5.0. in this case, git-rerere is recommended so that you can -+ solve the similar conflicts automatically when you upgrade to 5.1 or -+ later in the future. -+ -+o aufs5-standalone tree -+$ git clone git://github.com/sfjro/aufs5-standalone.git aufs5-standalone.git -+$ cd aufs5-standalone.git -+$ git checkout origin/aufs5.0 -+ -+o aufs-util tree -+$ git clone git://git.code.sf.net/p/aufs/aufs-util aufs-util.git -+- note that the public aufs-util.git is on SourceForge instead of -+ GitHUB. -+$ cd aufs-util.git -+$ git checkout origin/aufs5.0 -+ -+Note: The 5.x-rcN branch is to be used with `rc' kernel versions ONLY. -+The minor version number, 'x' in '5.x', of aufs may not always -+follow the minor version number of the kernel. -+Because changes in the kernel that cause the use of a new -+minor version number do not always require changes to aufs-util. -+ -+Since aufs-util has its own minor version number, you may not be -+able to find a GIT branch in aufs-util for your kernel's -+exact minor version number. -+In this case, you should git-checkout the branch for the -+nearest lower number. -+ -+For (an unreleased) example: -+If you are using "linux-5.10" and the "aufs5.10" branch -+does not exist in aufs-util repository, then "aufs5.9", "aufs5.8" -+or something numerically smaller is the branch for your kernel. -+ -+Also you can view all branches by -+ $ git branch -a -+ -+ -+3. Configuration and Compilation -+---------------------------------------- -+Make sure you have git-checkout'ed the correct branch. -+ -+For aufs5-linux tree, -+- enable CONFIG_AUFS_FS. -+- set other aufs configurations if necessary. -+ -+For aufs5-standalone tree, -+There are several ways to build. -+ -+1. -+- apply ./aufs5-kbuild.patch to your kernel source files. -+- apply ./aufs5-base.patch too. -+- apply ./aufs5-mmap.patch too. -+- apply ./aufs5-standalone.patch too, if you have a plan to set -+ CONFIG_AUFS_FS=m. otherwise you don't need ./aufs5-standalone.patch. -+- copy ./{Documentation,fs,include/uapi/linux/aufs_type.h} files to your -+ kernel source tree. Never copy $PWD/include/uapi/linux/Kbuild. -+- enable CONFIG_AUFS_FS, you can select either -+ =m or =y. -+- and build your kernel as usual. -+- install the built kernel. -+- install the header files too by "make headers_install" to the -+ directory where you specify. By default, it is $PWD/usr. -+ "make help" shows a brief note for headers_install. -+- and reboot your system. -+ -+2. -+- module only (CONFIG_AUFS_FS=m). -+- apply ./aufs5-base.patch to your kernel source files. -+- apply ./aufs5-mmap.patch too. -+- apply ./aufs5-standalone.patch too. -+- build your kernel, don't forget "make headers_install", and reboot. -+- edit ./config.mk and set other aufs configurations if necessary. -+ Note: You should read $PWD/fs/aufs/Kconfig carefully which describes -+ every aufs configurations. -+- build the module by simple "make". -+- you can specify ${KDIR} make variable which points to your kernel -+ source tree. -+- install the files -+ + run "make install" to install the aufs module, or copy the built -+ $PWD/aufs.ko to /lib/modules/... and run depmod -a (or reboot simply). -+ + run "make install_headers" (instead of headers_install) to install -+ the modified aufs header file (you can specify DESTDIR which is -+ available in aufs standalone version's Makefile only), or copy -+ $PWD/usr/include/linux/aufs_type.h to /usr/include/linux or wherever -+ you like manually. By default, the target directory is $PWD/usr. -+- no need to apply aufs5-kbuild.patch, nor copying source files to your -+ kernel source tree. -+ -+Note: The header file aufs_type.h is necessary to build aufs-util -+ as well as "make headers_install" in the kernel source tree. -+ headers_install is subject to be forgotten, but it is essentially -+ necessary, not only for building aufs-util. -+ You may not meet problems without headers_install in some older -+ version though. -+ -+And then, -+- read README in aufs-util, build and install it -+- note that your distribution may contain an obsoleted version of -+ aufs_type.h in /usr/include/linux or something. When you build aufs -+ utilities, make sure that your compiler refers the correct aufs header -+ file which is built by "make headers_install." -+- if you want to use readdir(3) in userspace or pathconf(3) wrapper, -+ then run "make install_ulib" too. And refer to the aufs manual in -+ detail. -+ -+There several other patches in aufs5-standalone.git. They are all -+optional. When you meet some problems, they will help you. -+- aufs5-loopback.patch -+ Supports a nested loopback mount in a branch-fs. This patch is -+ unnecessary until aufs produces a message like "you may want to try -+ another patch for loopback file". -+- proc_mounts.patch -+ When there are many mountpoints and many mount(2)/umount(2) are -+ running, then /proc/mounts may not show the all mountpoints. This -+ patch makes /proc/mounts always show the full mountpoints list. -+ If you don't want to apply this patch and meet such problem, then you -+ need to increase the value of 'ProcMounts_Times' make-variable in -+ aufs-util.git as a second best solution. -+- vfs-ino.patch -+ Modifies a system global kernel internal function get_next_ino() in -+ order to stop assigning 0 for an inode-number. Not directly related to -+ aufs, but recommended generally. -+- tmpfs-idr.patch -+ Keeps the tmpfs inode number as the lowest value. Effective to reduce -+ the size of aufs XINO files for tmpfs branch. Also it prevents the -+ duplication of inode number, which is important for backup tools and -+ other utilities. When you find aufs XINO files for tmpfs branch -+ growing too much, try this patch. -+- lockdep-debug.patch -+ Because aufs is not only an ordinary filesystem (callee of VFS), but -+ also a caller of VFS functions for branch filesystems, subclassing of -+ the internal locks for LOCKDEP is necessary. LOCKDEP is a debugging -+ feature of linux kernel. If you enable CONFIG_LOCKDEP, then you will -+ need to apply this debug patch to expand several constant values. -+ If don't know what LOCKDEP is, then you don't have apply this patch. -+ -+ -+4. Usage -+---------------------------------------- -+At first, make sure aufs-util are installed, and please read the aufs -+manual, aufs.5 in aufs-util.git tree. -+$ man -l aufs.5 -+ -+And then, -+$ mkdir /tmp/rw /tmp/aufs -+# mount -t aufs -o br=/tmp/rw:${HOME} none /tmp/aufs -+ -+Here is another example. The result is equivalent. -+# mount -t aufs -o br=/tmp/rw=rw:${HOME}=ro none /tmp/aufs -+ Or -+# mount -t aufs -o br:/tmp/rw none /tmp/aufs -+# mount -o remount,append:${HOME} /tmp/aufs -+ -+Then, you can see whole tree of your home dir through /tmp/aufs. If -+you modify a file under /tmp/aufs, the one on your home directory is -+not affected, instead the same named file will be newly created under -+/tmp/rw. And all of your modification to a file will be applied to -+the one under /tmp/rw. This is called the file based Copy on Write -+(COW) method. -+Aufs mount options are described in aufs.5. -+If you run chroot or something and make your aufs as a root directory, -+then you need to customize the shutdown script. See the aufs manual in -+detail. -+ -+Additionally, there are some sample usages of aufs which are a -+diskless system with network booting, and LiveCD over NFS. -+See sample dir in CVS tree on SourceForge. -+ -+ -+5. Contact -+---------------------------------------- -+When you have any problems or strange behaviour in aufs, please let me -+know with: -+- /proc/mounts (instead of the output of mount(8)) -+- /sys/module/aufs/* -+- /sys/fs/aufs/* (if you have them) -+- /debug/aufs/* (if you have them) -+- linux kernel version -+ if your kernel is not plain, for example modified by distributor, -+ the url where i can download its source is necessary too. -+- aufs version which was printed at loading the module or booting the -+ system, instead of the date you downloaded. -+- configuration (define/undefine CONFIG_AUFS_xxx) -+- kernel configuration or /proc/config.gz (if you have it) -+- behaviour which you think to be incorrect -+- actual operation, reproducible one is better -+- mailto: aufs-users at lists.sourceforge.net -+ -+Usually, I don't watch the Public Areas(Bugs, Support Requests, Patches, -+and Feature Requests) on SourceForge. Please join and write to -+aufs-users ML. -+ -+ -+6. Acknowledgements -+---------------------------------------- -+Thanks to everyone who have tried and are using aufs, whoever -+have reported a bug or any feedback. -+ -+Especially donators: -+Tomas Matejicek(slax.org) made a donation (much more than once). -+ Since Apr 2010, Tomas M (the author of Slax and Linux Live -+ scripts) is making "doubling" donations. -+ Unfortunately I cannot list all of the donators, but I really -+ appreciate. -+ It ends Aug 2010, but the ordinary donation URL is still available. -+ <http://sourceforge.net/donate/index.php?group_id=167503> -+Dai Itasaka made a donation (2007/8). -+Chuck Smith made a donation (2008/4, 10 and 12). -+Henk Schoneveld made a donation (2008/9). -+Chih-Wei Huang, ASUS, CTC donated Eee PC 4G (2008/10). -+Francois Dupoux made a donation (2008/11). -+Bruno Cesar Ribas and Luis Carlos Erpen de Bona, C3SL serves public -+ aufs2 GIT tree (2009/2). -+William Grant made a donation (2009/3). -+Patrick Lane made a donation (2009/4). -+The Mail Archive (mail-archive.com) made donations (2009/5). -+Nippy Networks (Ed Wildgoose) made a donation (2009/7). -+New Dream Network, LLC (www.dreamhost.com) made a donation (2009/11). -+Pavel Pronskiy made a donation (2011/2). -+Iridium and Inmarsat satellite phone retailer (www.mailasail.com), Nippy -+ Networks (Ed Wildgoose) made a donation for hardware (2011/3). -+Max Lekomcev (DOM-TV project) made a donation (2011/7, 12, 2012/3, 6 and -+11). -+Sam Liddicott made a donation (2011/9). -+Era Scarecrow made a donation (2013/4). -+Bor Ratajc made a donation (2013/4). -+Alessandro Gorreta made a donation (2013/4). -+POIRETTE Marc made a donation (2013/4). -+Alessandro Gorreta made a donation (2013/4). -+lauri kasvandik made a donation (2013/5). -+"pemasu from Finland" made a donation (2013/7). -+The Parted Magic Project made a donation (2013/9 and 11). -+Pavel Barta made a donation (2013/10). -+Nikolay Pertsev made a donation (2014/5). -+James B made a donation (2014/7 and 2015/7). -+Stefano Di Biase made a donation (2014/8). -+Daniel Epellei made a donation (2015/1). -+OmegaPhil made a donation (2016/1, 2018/4). -+Tomasz Szewczyk made a donation (2016/4). -+James Burry made a donation (2016/12). -+Carsten Rose made a donation (2018/9). -+Porteus Kiosk made a donation (2018/10). -+ -+Thank you very much. -+Donations are always, including future donations, very important and -+helpful for me to keep on developing aufs. -+ -+ -+7. -+---------------------------------------- -+If you are an experienced user, no explanation is needed. Aufs is -+just a linux filesystem. -+ -+ -+Enjoy! -+ -+# Local variables: ; -+# mode: text; -+# End: ; -diff --git a/Documentation/filesystems/aufs/design/01intro.txt b/Documentation/filesystems/aufs/design/01intro.txt -new file mode 100644 -index 000000000000..609bf0e9b93a ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/01intro.txt -@@ -0,0 +1,171 @@ -+ -+# Copyright (C) 2005-2019 Junjiro R. Okajima -+# -+# This program is free software; you can redistribute it and/or modify -+# it under the terms of the GNU General Public License as published by -+# the Free Software Foundation; either version 2 of the License, or -+# (at your option) any later version. -+# -+# This program is distributed in the hope that it will be useful, -+# but WITHOUT ANY WARRANTY; without even the implied warranty of -+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+# GNU General Public License for more details. -+# -+# You should have received a copy of the GNU General Public License -+# along with this program. If not, see <http://www.gnu.org/licenses/>. -+ -+Introduction -+---------------------------------------- -+ -+aufs [ei ju: ef es] | /ey-yoo-ef-es/ | [a u f s] -+1. abbrev. for "advanced multi-layered unification filesystem". -+2. abbrev. for "another unionfs". -+3. abbrev. for "auf das" in German which means "on the" in English. -+ Ex. "Butter aufs Brot"(G) means "butter onto bread"(E). -+ But "Filesystem aufs Filesystem" is hard to understand. -+4. abbrev. for "African Urban Fashion Show". -+ -+AUFS is a filesystem with features: -+- multi layered stackable unification filesystem, the member directory -+ is called as a branch. -+- branch permission and attribute, 'readonly', 'real-readonly', -+ 'readwrite', 'whiteout-able', 'link-able whiteout', etc. and their -+ combination. -+- internal "file copy-on-write". -+- logical deletion, whiteout. -+- dynamic branch manipulation, adding, deleting and changing permission. -+- allow bypassing aufs, user's direct branch access. -+- external inode number translation table and bitmap which maintains the -+ persistent aufs inode number. -+- seekable directory, including NFS readdir. -+- file mapping, mmap and sharing pages. -+- pseudo-link, hardlink over branches. -+- loopback mounted filesystem as a branch. -+- several policies to select one among multiple writable branches. -+- revert a single systemcall when an error occurs in aufs. -+- and more... -+ -+ -+Multi Layered Stackable Unification Filesystem -+---------------------------------------------------------------------- -+Most people already knows what it is. -+It is a filesystem which unifies several directories and provides a -+merged single directory. When users access a file, the access will be -+passed/re-directed/converted (sorry, I am not sure which English word is -+correct) to the real file on the member filesystem. The member -+filesystem is called 'lower filesystem' or 'branch' and has a mode -+'readonly' and 'readwrite.' And the deletion for a file on the lower -+readonly branch is handled by creating 'whiteout' on the upper writable -+branch. -+ -+On LKML, there have been discussions about UnionMount (Jan Blunck, -+Bharata B Rao and Valerie Aurora) and Unionfs (Erez Zadok). They took -+different approaches to implement the merged-view. -+The former tries putting it into VFS, and the latter implements as a -+separate filesystem. -+(If I misunderstand about these implementations, please let me know and -+I shall correct it. Because it is a long time ago when I read their -+source files last time). -+ -+UnionMount's approach will be able to small, but may be hard to share -+branches between several UnionMount since the whiteout in it is -+implemented in the inode on branch filesystem and always -+shared. According to Bharata's post, readdir does not seems to be -+finished yet. -+There are several missing features known in this implementations such as -+- for users, the inode number may change silently. eg. copy-up. -+- link(2) may break by copy-up. -+- read(2) may get an obsoleted filedata (fstat(2) too). -+- fcntl(F_SETLK) may be broken by copy-up. -+- unnecessary copy-up may happen, for example mmap(MAP_PRIVATE) after -+ open(O_RDWR). -+ -+In linux-3.18, "overlay" filesystem (formerly known as "overlayfs") was -+merged into mainline. This is another implementation of UnionMount as a -+separated filesystem. All the limitations and known problems which -+UnionMount are equally inherited to "overlay" filesystem. -+ -+Unionfs has a longer history. When I started implementing a stackable -+filesystem (Aug 2005), it already existed. It has virtual super_block, -+inode, dentry and file objects and they have an array pointing lower -+same kind objects. After contributing many patches for Unionfs, I -+re-started my project AUFS (Jun 2006). -+ -+In AUFS, the structure of filesystem resembles to Unionfs, but I -+implemented my own ideas, approaches and enhancements and it became -+totally different one. -+ -+Comparing DM snapshot and fs based implementation -+- the number of bytes to be copied between devices is much smaller. -+- the type of filesystem must be one and only. -+- the fs must be writable, no readonly fs, even for the lower original -+ device. so the compression fs will not be usable. but if we use -+ loopback mount, we may address this issue. -+ for instance, -+ mount /cdrom/squashfs.img /sq -+ losetup /sq/ext2.img -+ losetup /somewhere/cow -+ dmsetup "snapshot /dev/loop0 /dev/loop1 ..." -+- it will be difficult (or needs more operations) to extract the -+ difference between the original device and COW. -+- DM snapshot-merge may help a lot when users try merging. in the -+ fs-layer union, users will use rsync(1). -+ -+You may want to read my old paper "Filesystems in LiveCD" -+(http://aufs.sourceforge.net/aufs2/report/sq/sq.pdf). -+ -+ -+Several characters/aspects/persona of aufs -+---------------------------------------------------------------------- -+ -+Aufs has several characters, aspects or persona. -+1. a filesystem, callee of VFS helper -+2. sub-VFS, caller of VFS helper for branches -+3. a virtual filesystem which maintains persistent inode number -+4. reader/writer of files on branches such like an application -+ -+1. Callee of VFS Helper -+As an ordinary linux filesystem, aufs is a callee of VFS. For instance, -+unlink(2) from an application reaches sys_unlink() kernel function and -+then vfs_unlink() is called. vfs_unlink() is one of VFS helper and it -+calls filesystem specific unlink operation. Actually aufs implements the -+unlink operation but it behaves like a redirector. -+ -+2. Caller of VFS Helper for Branches -+aufs_unlink() passes the unlink request to the branch filesystem as if -+it were called from VFS. So the called unlink operation of the branch -+filesystem acts as usual. As a caller of VFS helper, aufs should handle -+every necessary pre/post operation for the branch filesystem. -+- acquire the lock for the parent dir on a branch -+- lookup in a branch -+- revalidate dentry on a branch -+- mnt_want_write() for a branch -+- vfs_unlink() for a branch -+- mnt_drop_write() for a branch -+- release the lock on a branch -+ -+3. Persistent Inode Number -+One of the most important issue for a filesystem is to maintain inode -+numbers. This is particularly important to support exporting a -+filesystem via NFS. Aufs is a virtual filesystem which doesn't have a -+backend block device for its own. But some storage is necessary to -+keep and maintain the inode numbers. It may be a large space and may not -+suit to keep in memory. Aufs rents some space from its first writable -+branch filesystem (by default) and creates file(s) on it. These files -+are created by aufs internally and removed soon (currently) keeping -+opened. -+Note: Because these files are removed, they are totally gone after -+ unmounting aufs. It means the inode numbers are not persistent -+ across unmount or reboot. I have a plan to make them really -+ persistent which will be important for aufs on NFS server. -+ -+4. Read/Write Files Internally (copy-on-write) -+Because a branch can be readonly, when you write a file on it, aufs will -+"copy-up" it to the upper writable branch internally. And then write the -+originally requested thing to the file. Generally kernel doesn't -+open/read/write file actively. In aufs, even a single write may cause a -+internal "file copy". This behaviour is very similar to cp(1) command. -+ -+Some people may think it is better to pass such work to user space -+helper, instead of doing in kernel space. Actually I am still thinking -+about it. But currently I have implemented it in kernel space. -diff --git a/Documentation/filesystems/aufs/design/02struct.txt b/Documentation/filesystems/aufs/design/02struct.txt -new file mode 100644 -index 000000000000..2467788c7f10 ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/02struct.txt -@@ -0,0 +1,258 @@ -+ -+# Copyright (C) 2005-2019 Junjiro R. Okajima -+# -+# This program is free software; you can redistribute it and/or modify -+# it under the terms of the GNU General Public License as published by -+# the Free Software Foundation; either version 2 of the License, or -+# (at your option) any later version. -+# -+# This program is distributed in the hope that it will be useful, -+# but WITHOUT ANY WARRANTY; without even the implied warranty of -+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+# GNU General Public License for more details. -+# -+# You should have received a copy of the GNU General Public License -+# along with this program. If not, see <http://www.gnu.org/licenses/>. -+ -+Basic Aufs Internal Structure -+ -+Superblock/Inode/Dentry/File Objects -+---------------------------------------------------------------------- -+As like an ordinary filesystem, aufs has its own -+superblock/inode/dentry/file objects. All these objects have a -+dynamically allocated array and store the same kind of pointers to the -+lower filesystem, branch. -+For example, when you build a union with one readwrite branch and one -+readonly, mounted /au, /rw and /ro respectively. -+- /au = /rw + /ro -+- /ro/fileA exists but /rw/fileA -+ -+Aufs lookup operation finds /ro/fileA and gets dentry for that. These -+pointers are stored in a aufs dentry. The array in aufs dentry will be, -+- [0] = NULL (because /rw/fileA doesn't exist) -+- [1] = /ro/fileA -+ -+This style of an array is essentially same to the aufs -+superblock/inode/dentry/file objects. -+ -+Because aufs supports manipulating branches, ie. add/delete/change -+branches dynamically, these objects has its own generation. When -+branches are changed, the generation in aufs superblock is -+incremented. And a generation in other object are compared when it is -+accessed. When a generation in other objects are obsoleted, aufs -+refreshes the internal array. -+ -+ -+Superblock -+---------------------------------------------------------------------- -+Additionally aufs superblock has some data for policies to select one -+among multiple writable branches, XIB files, pseudo-links and kobject. -+See below in detail. -+About the policies which supports copy-down a directory, see -+wbr_policy.txt too. -+ -+ -+Branch and XINO(External Inode Number Translation Table) -+---------------------------------------------------------------------- -+Every branch has its own xino (external inode number translation table) -+file. The xino file is created and unlinked by aufs internally. When two -+members of a union exist on the same filesystem, they share the single -+xino file. -+The struct of a xino file is simple, just a sequence of aufs inode -+numbers which is indexed by the lower inode number. -+In the above sample, assume the inode number of /ro/fileA is i111 and -+aufs assigns the inode number i999 for fileA. Then aufs writes 999 as -+4(8) bytes at 111 * 4(8) bytes offset in the xino file. -+ -+When the inode numbers are not contiguous, the xino file will be sparse -+which has a hole in it and doesn't consume as much disk space as it -+might appear. If your branch filesystem consumes disk space for such -+holes, then you should specify 'xino=' option at mounting aufs. -+ -+Aufs has a mount option to free the disk blocks for such holes in XINO -+files on tmpfs or ramdisk. But it is not so effective actually. If you -+meet a problem of disk shortage due to XINO files, then you should try -+"tmpfs-ino.patch" (and "vfs-ino.patch" too) in aufs4-standalone.git. -+The patch localizes the assignment inumbers per tmpfs-mount and avoid -+the holes in XINO files. -+ -+Also a writable branch has three kinds of "whiteout bases". All these -+are existed when the branch is joined to aufs, and their names are -+whiteout-ed doubly, so that users will never see their names in aufs -+hierarchy. -+1. a regular file which will be hardlinked to all whiteouts. -+2. a directory to store a pseudo-link. -+3. a directory to store an "orphan"-ed file temporary. -+ -+1. Whiteout Base -+ When you remove a file on a readonly branch, aufs handles it as a -+ logical deletion and creates a whiteout on the upper writable branch -+ as a hardlink of this file in order not to consume inode on the -+ writable branch. -+2. Pseudo-link Dir -+ See below, Pseudo-link. -+3. Step-Parent Dir -+ When "fileC" exists on the lower readonly branch only and it is -+ opened and removed with its parent dir, and then user writes -+ something into it, then aufs copies-up fileC to this -+ directory. Because there is no other dir to store fileC. After -+ creating a file under this dir, the file is unlinked. -+ -+Because aufs supports manipulating branches, ie. add/delete/change -+dynamically, a branch has its own id. When the branch order changes, -+aufs finds the new index by searching the branch id. -+ -+ -+Pseudo-link -+---------------------------------------------------------------------- -+Assume "fileA" exists on the lower readonly branch only and it is -+hardlinked to "fileB" on the branch. When you write something to fileA, -+aufs copies-up it to the upper writable branch. Additionally aufs -+creates a hardlink under the Pseudo-link Directory of the writable -+branch. The inode of a pseudo-link is kept in aufs super_block as a -+simple list. If fileB is read after unlinking fileA, aufs returns -+filedata from the pseudo-link instead of the lower readonly -+branch. Because the pseudo-link is based upon the inode, to keep the -+inode number by xino (see above) is essentially necessary. -+ -+All the hardlinks under the Pseudo-link Directory of the writable branch -+should be restored in a proper location later. Aufs provides a utility -+to do this. The userspace helpers executed at remounting and unmounting -+aufs by default. -+During this utility is running, it puts aufs into the pseudo-link -+maintenance mode. In this mode, only the process which began the -+maintenance mode (and its child processes) is allowed to operate in -+aufs. Some other processes which are not related to the pseudo-link will -+be allowed to run too, but the rest have to return an error or wait -+until the maintenance mode ends. If a process already acquires an inode -+mutex (in VFS), it has to return an error. -+ -+ -+XIB(external inode number bitmap) -+---------------------------------------------------------------------- -+Addition to the xino file per a branch, aufs has an external inode number -+bitmap in a superblock object. It is also an internal file such like a -+xino file. -+It is a simple bitmap to mark whether the aufs inode number is in-use or -+not. -+To reduce the file I/O, aufs prepares a single memory page to cache xib. -+ -+As well as XINO files, aufs has a feature to truncate/refresh XIB to -+reduce the number of consumed disk blocks for these files. -+ -+ -+Virtual or Vertical Dir, and Readdir in Userspace -+---------------------------------------------------------------------- -+In order to support multiple layers (branches), aufs readdir operation -+constructs a virtual dir block on memory. For readdir, aufs calls -+vfs_readdir() internally for each dir on branches, merges their entries -+with eliminating the whiteout-ed ones, and sets it to file (dir) -+object. So the file object has its entry list until it is closed. The -+entry list will be updated when the file position is zero and becomes -+obsoleted. This decision is made in aufs automatically. -+ -+The dynamically allocated memory block for the name of entries has a -+unit of 512 bytes (by default) and stores the names contiguously (no -+padding). Another block for each entry is handled by kmem_cache too. -+During building dir blocks, aufs creates hash list and judging whether -+the entry is whiteouted by its upper branch or already listed. -+The merged result is cached in the corresponding inode object and -+maintained by a customizable life-time option. -+ -+Some people may call it can be a security hole or invite DoS attack -+since the opened and once readdir-ed dir (file object) holds its entry -+list and becomes a pressure for system memory. But I'd say it is similar -+to files under /proc or /sys. The virtual files in them also holds a -+memory page (generally) while they are opened. When an idea to reduce -+memory for them is introduced, it will be applied to aufs too. -+For those who really hate this situation, I've developed readdir(3) -+library which operates this merging in userspace. You just need to set -+LD_PRELOAD environment variable, and aufs will not consume no memory in -+kernel space for readdir(3). -+ -+ -+Workqueue -+---------------------------------------------------------------------- -+Aufs sometimes requires privilege access to a branch. For instance, -+in copy-up/down operation. When a user process is going to make changes -+to a file which exists in the lower readonly branch only, and the mode -+of one of ancestor directories may not be writable by a user -+process. Here aufs copy-up the file with its ancestors and they may -+require privilege to set its owner/group/mode/etc. -+This is a typical case of a application character of aufs (see -+Introduction). -+ -+Aufs uses workqueue synchronously for this case. It creates its own -+workqueue. The workqueue is a kernel thread and has privilege. Aufs -+passes the request to call mkdir or write (for example), and wait for -+its completion. This approach solves a problem of a signal handler -+simply. -+If aufs didn't adopt the workqueue and changed the privilege of the -+process, then the process may receive the unexpected SIGXFSZ or other -+signals. -+ -+Also aufs uses the system global workqueue ("events" kernel thread) too -+for asynchronous tasks, such like handling inotify/fsnotify, re-creating a -+whiteout base and etc. This is unrelated to a privilege. -+Most of aufs operation tries acquiring a rw_semaphore for aufs -+superblock at the beginning, at the same time waits for the completion -+of all queued asynchronous tasks. -+ -+ -+Whiteout -+---------------------------------------------------------------------- -+The whiteout in aufs is very similar to Unionfs's. That is represented -+by its filename. UnionMount takes an approach of a file mode, but I am -+afraid several utilities (find(1) or something) will have to support it. -+ -+Basically the whiteout represents "logical deletion" which stops aufs to -+lookup further, but also it represents "dir is opaque" which also stop -+further lookup. -+ -+In aufs, rmdir(2) and rename(2) for dir uses whiteout alternatively. -+In order to make several functions in a single systemcall to be -+revertible, aufs adopts an approach to rename a directory to a temporary -+unique whiteouted name. -+For example, in rename(2) dir where the target dir already existed, aufs -+renames the target dir to a temporary unique whiteouted name before the -+actual rename on a branch, and then handles other actions (make it opaque, -+update the attributes, etc). If an error happens in these actions, aufs -+simply renames the whiteouted name back and returns an error. If all are -+succeeded, aufs registers a function to remove the whiteouted unique -+temporary name completely and asynchronously to the system global -+workqueue. -+ -+ -+Copy-up -+---------------------------------------------------------------------- -+It is a well-known feature or concept. -+When user modifies a file on a readonly branch, aufs operate "copy-up" -+internally and makes change to the new file on the upper writable branch. -+When the trigger systemcall does not update the timestamps of the parent -+dir, aufs reverts it after copy-up. -+ -+ -+Move-down (aufs3.9 and later) -+---------------------------------------------------------------------- -+"Copy-up" is one of the essential feature in aufs. It copies a file from -+the lower readonly branch to the upper writable branch when a user -+changes something about the file. -+"Move-down" is an opposite action of copy-up. Basically this action is -+ran manually instead of automatically and internally. -+For desgin and implementation, aufs has to consider these issues. -+- whiteout for the file may exist on the lower branch. -+- ancestor directories may not exist on the lower branch. -+- diropq for the ancestor directories may exist on the upper branch. -+- free space on the lower branch will reduce. -+- another access to the file may happen during moving-down, including -+ UDBA (see "Revalidate Dentry and UDBA"). -+- the file should not be hard-linked nor pseudo-linked. they should be -+ handled by auplink utility later. -+ -+Sometimes users want to move-down a file from the upper writable branch -+to the lower readonly or writable branch. For instance, -+- the free space of the upper writable branch is going to run out. -+- create a new intermediate branch between the upper and lower branch. -+- etc. -+ -+For this purpose, use "aumvdown" command in aufs-util.git. -diff --git a/Documentation/filesystems/aufs/design/03atomic_open.txt b/Documentation/filesystems/aufs/design/03atomic_open.txt -new file mode 100644 -index 000000000000..9f16ac1e0173 ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/03atomic_open.txt -@@ -0,0 +1,85 @@ -+ -+# Copyright (C) 2015-2019 Junjiro R. Okajima -+# -+# This program is free software; you can redistribute it and/or modify -+# it under the terms of the GNU General Public License as published by -+# the Free Software Foundation; either version 2 of the License, or -+# (at your option) any later version. -+# -+# This program is distributed in the hope that it will be useful, -+# but WITHOUT ANY WARRANTY; without even the implied warranty of -+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+# GNU General Public License for more details. -+# -+# You should have received a copy of the GNU General Public License -+# along with this program. If not, see <http://www.gnu.org/licenses/>. -+ -+Support for a branch who has its ->atomic_open() -+---------------------------------------------------------------------- -+The filesystems who implement its ->atomic_open() are not majority. For -+example NFSv4 does, and aufs should call NFSv4 ->atomic_open, -+particularly for open(O_CREAT|O_EXCL, 0400) case. Other than -+->atomic_open(), NFSv4 returns an error for this open(2). While I am not -+sure whether all filesystems who have ->atomic_open() behave like this, -+but NFSv4 surely returns the error. -+ -+In order to support ->atomic_open() for aufs, there are a few -+approaches. -+ -+A. Introduce aufs_atomic_open() -+ - calls one of VFS:do_last(), lookup_open() or atomic_open() for -+ branch fs. -+B. Introduce aufs_atomic_open() calling create, open and chmod. this is -+ an aufs user Pip Cet's approach -+ - calls aufs_create(), VFS finish_open() and notify_change(). -+ - pass fake-mode to finish_open(), and then correct the mode by -+ notify_change(). -+C. Extend aufs_open() to call branch fs's ->atomic_open() -+ - no aufs_atomic_open(). -+ - aufs_lookup() registers the TID to an aufs internal object. -+ - aufs_create() does nothing when the matching TID is registered, but -+ registers the mode. -+ - aufs_open() calls branch fs's ->atomic_open() when the matching -+ TID is registered. -+D. Extend aufs_open() to re-try branch fs's ->open() with superuser's -+ credential -+ - no aufs_atomic_open(). -+ - aufs_create() registers the TID to an internal object. this info -+ represents "this process created this file just now." -+ - when aufs gets EACCES from branch fs's ->open(), then confirm the -+ registered TID and re-try open() with superuser's credential. -+ -+Pros and cons for each approach. -+ -+A. -+ - straightforward but highly depends upon VFS internal. -+ - the atomic behavaiour is kept. -+ - some of parameters such as nameidata are hard to reproduce for -+ branch fs. -+ - large overhead. -+B. -+ - easy to implement. -+ - the atomic behavaiour is lost. -+C. -+ - the atomic behavaiour is kept. -+ - dirty and tricky. -+ - VFS checks whether the file is created correctly after calling -+ ->create(), which means this approach doesn't work. -+D. -+ - easy to implement. -+ - the atomic behavaiour is lost. -+ - to open a file with superuser's credential and give it to a user -+ process is a bad idea, since the file object keeps the credential -+ in it. It may affect LSM or something. This approach doesn't work -+ either. -+ -+The approach A is ideal, but it hard to implement. So here is a -+variation of A, which is to be implemented. -+ -+A-1. Introduce aufs_atomic_open() -+ - calls branch fs ->atomic_open() if exists. otherwise calls -+ vfs_create() and finish_open(). -+ - the demerit is that the several checks after branch fs -+ ->atomic_open() are lost. in the ordinary case, the checks are -+ done by VFS:do_last(), lookup_open() and atomic_open(). some can -+ be implemented in aufs, but not all I am afraid. -diff --git a/Documentation/filesystems/aufs/design/03lookup.txt b/Documentation/filesystems/aufs/design/03lookup.txt -new file mode 100644 -index 000000000000..08b443d94dfa ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/03lookup.txt -@@ -0,0 +1,113 @@ -+ -+# Copyright (C) 2005-2019 Junjiro R. Okajima -+# -+# This program is free software; you can redistribute it and/or modify -+# it under the terms of the GNU General Public License as published by -+# the Free Software Foundation; either version 2 of the License, or -+# (at your option) any later version. -+# -+# This program is distributed in the hope that it will be useful, -+# but WITHOUT ANY WARRANTY; without even the implied warranty of -+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+# GNU General Public License for more details. -+# -+# You should have received a copy of the GNU General Public License -+# along with this program. If not, see <http://www.gnu.org/licenses/>. -+ -+Lookup in a Branch -+---------------------------------------------------------------------- -+Since aufs has a character of sub-VFS (see Introduction), it operates -+lookup for branches as VFS does. It may be a heavy work. But almost all -+lookup operation in aufs is the simplest case, ie. lookup only an entry -+directly connected to its parent. Digging down the directory hierarchy -+is unnecessary. VFS has a function lookup_one_len() for that use, and -+aufs calls it. -+ -+When a branch is a remote filesystem, aufs basically relies upon its -+->d_revalidate(), also aufs forces the hardest revalidate tests for -+them. -+For d_revalidate, aufs implements three levels of revalidate tests. See -+"Revalidate Dentry and UDBA" in detail. -+ -+ -+Test Only the Highest One for the Directory Permission (dirperm1 option) -+---------------------------------------------------------------------- -+Let's try case study. -+- aufs has two branches, upper readwrite and lower readonly. -+ /au = /rw + /ro -+- "dirA" exists under /ro, but /rw. and its mode is 0700. -+- user invoked "chmod a+rx /au/dirA" -+- the internal copy-up is activated and "/rw/dirA" is created and its -+ permission bits are set to world readable. -+- then "/au/dirA" becomes world readable? -+ -+In this case, /ro/dirA is still 0700 since it exists in readonly branch, -+or it may be a natively readonly filesystem. If aufs respects the lower -+branch, it should not respond readdir request from other users. But user -+allowed it by chmod. Should really aufs rejects showing the entries -+under /ro/dirA? -+ -+To be honest, I don't have a good solution for this case. So aufs -+implements 'dirperm1' and 'nodirperm1' mount options, and leave it to -+users. -+When dirperm1 is specified, aufs checks only the highest one for the -+directory permission, and shows the entries. Otherwise, as usual, checks -+every dir existing on all branches and rejects the request. -+ -+As a side effect, dirperm1 option improves the performance of aufs -+because the number of permission check is reduced when the number of -+branch is many. -+ -+ -+Revalidate Dentry and UDBA (User's Direct Branch Access) -+---------------------------------------------------------------------- -+Generally VFS helpers re-validate a dentry as a part of lookup. -+0. digging down the directory hierarchy. -+1. lock the parent dir by its i_mutex. -+2. lookup the final (child) entry. -+3. revalidate it. -+4. call the actual operation (create, unlink, etc.) -+5. unlock the parent dir -+ -+If the filesystem implements its ->d_revalidate() (step 3), then it is -+called. Actually aufs implements it and checks the dentry on a branch is -+still valid. -+But it is not enough. Because aufs has to release the lock for the -+parent dir on a branch at the end of ->lookup() (step 2) and -+->d_revalidate() (step 3) while the i_mutex of the aufs dir is still -+held by VFS. -+If the file on a branch is changed directly, eg. bypassing aufs, after -+aufs released the lock, then the subsequent operation may cause -+something unpleasant result. -+ -+This situation is a result of VFS architecture, ->lookup() and -+->d_revalidate() is separated. But I never say it is wrong. It is a good -+design from VFS's point of view. It is just not suitable for sub-VFS -+character in aufs. -+ -+Aufs supports such case by three level of revalidation which is -+selectable by user. -+1. Simple Revalidate -+ Addition to the native flow in VFS's, confirm the child-parent -+ relationship on the branch just after locking the parent dir on the -+ branch in the "actual operation" (step 4). When this validation -+ fails, aufs returns EBUSY. ->d_revalidate() (step 3) in aufs still -+ checks the validation of the dentry on branches. -+2. Monitor Changes Internally by Inotify/Fsnotify -+ Addition to above, in the "actual operation" (step 4) aufs re-lookup -+ the dentry on the branch, and returns EBUSY if it finds different -+ dentry. -+ Additionally, aufs sets the inotify/fsnotify watch for every dir on branches -+ during it is in cache. When the event is notified, aufs registers a -+ function to kernel 'events' thread by schedule_work(). And the -+ function sets some special status to the cached aufs dentry and inode -+ private data. If they are not cached, then aufs has nothing to -+ do. When the same file is accessed through aufs (step 0-3) later, -+ aufs will detect the status and refresh all necessary data. -+ In this mode, aufs has to ignore the event which is fired by aufs -+ itself. -+3. No Extra Validation -+ This is the simplest test and doesn't add any additional revalidation -+ test, and skip the revalidation in step 4. It is useful and improves -+ aufs performance when system surely hide the aufs branches from user, -+ by over-mounting something (or another method). -diff --git a/Documentation/filesystems/aufs/design/04branch.txt b/Documentation/filesystems/aufs/design/04branch.txt -new file mode 100644 -index 000000000000..3ab3682a42b4 ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/04branch.txt -@@ -0,0 +1,74 @@ -+ -+# Copyright (C) 2005-2019 Junjiro R. Okajima -+# -+# This program is free software; you can redistribute it and/or modify -+# it under the terms of the GNU General Public License as published by -+# the Free Software Foundation; either version 2 of the License, or -+# (at your option) any later version. -+# -+# This program is distributed in the hope that it will be useful, -+# but WITHOUT ANY WARRANTY; without even the implied warranty of -+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+# GNU General Public License for more details. -+# -+# You should have received a copy of the GNU General Public License -+# along with this program. If not, see <http://www.gnu.org/licenses/>. -+ -+Branch Manipulation -+ -+Since aufs supports dynamic branch manipulation, ie. add/remove a branch -+and changing its permission/attribute, there are a lot of works to do. -+ -+ -+Add a Branch -+---------------------------------------------------------------------- -+o Confirm the adding dir exists outside of aufs, including loopback -+ mount, and its various attributes. -+o Initialize the xino file and whiteout bases if necessary. -+ See struct.txt. -+ -+o Check the owner/group/mode of the directory -+ When the owner/group/mode of the adding directory differs from the -+ existing branch, aufs issues a warning because it may impose a -+ security risk. -+ For example, when a upper writable branch has a world writable empty -+ top directory, a malicious user can create any files on the writable -+ branch directly, like copy-up and modify manually. If something like -+ /etc/{passwd,shadow} exists on the lower readonly branch but the upper -+ writable branch, and the writable branch is world-writable, then a -+ malicious guy may create /etc/passwd on the writable branch directly -+ and the infected file will be valid in aufs. -+ I am afraid it can be a security issue, but aufs can do nothing except -+ producing a warning. -+ -+ -+Delete a Branch -+---------------------------------------------------------------------- -+o Confirm the deleting branch is not busy -+ To be general, there is one merit to adopt "remount" interface to -+ manipulate branches. It is to discard caches. At deleting a branch, -+ aufs checks the still cached (and connected) dentries and inodes. If -+ there are any, then they are all in-use. An inode without its -+ corresponding dentry can be alive alone (for example, inotify/fsnotify case). -+ -+ For the cached one, aufs checks whether the same named entry exists on -+ other branches. -+ If the cached one is a directory, because aufs provides a merged view -+ to users, as long as one dir is left on any branch aufs can show the -+ dir to users. In this case, the branch can be removed from aufs. -+ Otherwise aufs rejects deleting the branch. -+ -+ If any file on the deleting branch is opened by aufs, then aufs -+ rejects deleting. -+ -+ -+Modify the Permission of a Branch -+---------------------------------------------------------------------- -+o Re-initialize or remove the xino file and whiteout bases if necessary. -+ See struct.txt. -+ -+o rw --> ro: Confirm the modifying branch is not busy -+ Aufs rejects the request if any of these conditions are true. -+ - a file on the branch is mmap-ed. -+ - a regular file on the branch is opened for write and there is no -+ same named entry on the upper branch. -diff --git a/Documentation/filesystems/aufs/design/05wbr_policy.txt b/Documentation/filesystems/aufs/design/05wbr_policy.txt -new file mode 100644 -index 000000000000..1f9b86bc6a3e ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/05wbr_policy.txt -@@ -0,0 +1,64 @@ -+ -+# Copyright (C) 2005-2019 Junjiro R. Okajima -+# -+# This program is free software; you can redistribute it and/or modify -+# it under the terms of the GNU General Public License as published by -+# the Free Software Foundation; either version 2 of the License, or -+# (at your option) any later version. -+# -+# This program is distributed in the hope that it will be useful, -+# but WITHOUT ANY WARRANTY; without even the implied warranty of -+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+# GNU General Public License for more details. -+# -+# You should have received a copy of the GNU General Public License -+# along with this program. If not, see <http://www.gnu.org/licenses/>. -+ -+Policies to Select One among Multiple Writable Branches -+---------------------------------------------------------------------- -+When the number of writable branch is more than one, aufs has to decide -+the target branch for file creation or copy-up. By default, the highest -+writable branch which has the parent (or ancestor) dir of the target -+file is chosen (top-down-parent policy). -+By user's request, aufs implements some other policies to select the -+writable branch, for file creation several policies, round-robin, -+most-free-space, and other policies. For copy-up, top-down-parent, -+bottom-up-parent, bottom-up and others. -+ -+As expected, the round-robin policy selects the branch in circular. When -+you have two writable branches and creates 10 new files, 5 files will be -+created for each branch. mkdir(2) systemcall is an exception. When you -+create 10 new directories, all will be created on the same branch. -+And the most-free-space policy selects the one which has most free -+space among the writable branches. The amount of free space will be -+checked by aufs internally, and users can specify its time interval. -+ -+The policies for copy-up is more simple, -+top-down-parent is equivalent to the same named on in create policy, -+bottom-up-parent selects the writable branch where the parent dir -+exists and the nearest upper one from the copyup-source, -+bottom-up selects the nearest upper writable branch from the -+copyup-source, regardless the existence of the parent dir. -+ -+There are some rules or exceptions to apply these policies. -+- If there is a readonly branch above the policy-selected branch and -+ the parent dir is marked as opaque (a variation of whiteout), or the -+ target (creating) file is whiteout-ed on the upper readonly branch, -+ then the result of the policy is ignored and the target file will be -+ created on the nearest upper writable branch than the readonly branch. -+- If there is a writable branch above the policy-selected branch and -+ the parent dir is marked as opaque or the target file is whiteouted -+ on the branch, then the result of the policy is ignored and the target -+ file will be created on the highest one among the upper writable -+ branches who has diropq or whiteout. In case of whiteout, aufs removes -+ it as usual. -+- link(2) and rename(2) systemcalls are exceptions in every policy. -+ They try selecting the branch where the source exists as possible -+ since copyup a large file will take long time. If it can't be, -+ ie. the branch where the source exists is readonly, then they will -+ follow the copyup policy. -+- There is an exception for rename(2) when the target exists. -+ If the rename target exists, aufs compares the index of the branches -+ where the source and the target exists and selects the higher -+ one. If the selected branch is readonly, then aufs follows the -+ copyup policy. -diff --git a/Documentation/filesystems/aufs/design/06dirren.dot b/Documentation/filesystems/aufs/design/06dirren.dot -new file mode 100644 -index 000000000000..2d62bb6dd55f ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/06dirren.dot -@@ -0,0 +1,31 @@ -+ -+// to view this graph, run dot(1) command in GRAPHVIZ. -+ -+digraph G { -+node [shape=box]; -+whinfo [label="detailed info file\n(lower_brid_root-hinum, h_inum, namelen, old name)"]; -+ -+node [shape=oval]; -+ -+aufs_rename -> whinfo [label="store/remove"]; -+ -+node [shape=oval]; -+inode_list [label="h_inum list in branch\ncache"]; -+ -+node [shape=box]; -+whinode [label="h_inum list file"]; -+ -+node [shape=oval]; -+brmgmt [label="br_add/del/mod/umount"]; -+ -+brmgmt -> inode_list [label="create/remove"]; -+brmgmt -> whinode [label="load/store"]; -+ -+inode_list -> whinode [style=dashed,dir=both]; -+ -+aufs_rename -> inode_list [label="add/del"]; -+ -+aufs_lookup -> inode_list [label="search"]; -+ -+aufs_lookup -> whinfo [label="load/remove"]; -+} -diff --git a/Documentation/filesystems/aufs/design/06dirren.txt b/Documentation/filesystems/aufs/design/06dirren.txt -new file mode 100644 -index 000000000000..3b80f8659b3e ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/06dirren.txt -@@ -0,0 +1,102 @@ -+ -+# Copyright (C) 2017-2019 Junjiro R. Okajima -+# -+# This program is free software; you can redistribute it and/or modify -+# it under the terms of the GNU General Public License as published by -+# the Free Software Foundation; either version 2 of the License, or -+# (at your option) any later version. -+# -+# This program is distributed in the hope that it will be useful, -+# but WITHOUT ANY WARRANTY; without even the implied warranty of -+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+# GNU General Public License for more details. -+# -+# You should have received a copy of the GNU General Public License -+# along with this program. If not, see <http://www.gnu.org/licenses/>. -+ -+Special handling for renaming a directory (DIRREN) -+---------------------------------------------------------------------- -+First, let's assume we have a simple usecase. -+ -+- /u = /rw + /ro -+- /rw/dirA exists -+- /ro/dirA and /ro/dirA/file exist too -+- there is no dirB on both branches -+- a user issues rename("dirA", "dirB") -+ -+Now, what should aufs behave against this rename(2)? -+There are a few possible cases. -+ -+A. returns EROFS. -+ since dirA exists on a readonly branch which cannot be renamed. -+B. returns EXDEV. -+ it is possible to copy-up dirA (only the dir itself), but the child -+ entries ("file" in this case) should not be. it must be a bad -+ approach to copy-up recursively. -+C. returns a success. -+ even the branch /ro is readonly, aufs tries renaming it. Obviously it -+ is a violation of aufs' policy. -+D. construct an extra information which indicates that /ro/dirA should -+ be handled as the name of dirB. -+ overlayfs has a similar feature called REDIRECT. -+ -+Until now, aufs implements the case B only which returns EXDEV, and -+expects the userspace application behaves like mv(1) which tries -+issueing rename(2) recursively. -+ -+A new aufs feature called DIRREN is introduced which implements the case -+D. There are several "extra information" added. -+ -+1. detailed info per renamed directory -+ path: /rw/dirB/$AUFS_WH_DR_INFO_PFX.<lower branch-id> -+2. the inode-number list of directories on a branch -+ path: /rw/dirB/$AUFS_WH_DR_BRHINO -+ -+The filename of "detailed info per directory" represents the lower -+branch, and its format is -+- a type of the branch id -+ one of these. -+ + uuid (not implemented yet) -+ + fsid -+ + dev -+- the inode-number of the branch root dir -+ -+And it contains these info in a single regular file. -+- magic number -+- branch's inode-number of the logically renamed dir -+- the name of the before-renamed dir -+ -+The "detailed info per directory" file is created in aufs rename(2), and -+loaded in any lookup. -+The info is considered in lookup for the matching case only. Here -+"matching" means that the root of branch (in the info filename) is same -+to the current looking-up branch. After looking-up the before-renamed -+name, the inode-number is compared. And the matched dentry is used. -+ -+The "inode-number list of directories" is a regular file which contains -+simply the inode-numbers on the branch. The file is created or updated -+in removing the branch, and loaded in adding the branch. Its lifetime is -+equal to the branch. -+The list is refered in lookup, and when the current target inode is -+found in the list, the aufs tries loading the "detailed info per -+directory" and get the changed and valid name of the dir. -+ -+Theoretically these "extra informaiton" may be able to be put into XATTR -+in the dir inode. But aufs doesn't choose this way because -+1. XATTR may not be supported by the branch (or its configuration) -+2. XATTR may have its size limit. -+3. XATTR may be less easy to convert than a regular file, when the -+ format of the info is changed in the future. -+At the same time, I agree that the regular file approach is much slower -+than XATTR approach. So, in the future, aufs may take the XATTR or other -+better approach. -+ -+This DIRREN feature is enabled by aufs configuration, and is activated -+by a new mount option. -+ -+For the more complicated case, there is a work with UDBA option, which -+is to dected the direct access to the branches (by-passing aufs) and to -+maintain the cashes in aufs. Since a single cached aufs dentry may -+contains two names, before- and after-rename, the name comparision in -+UDBA handler may not work correctly. In this case, the behaviour will be -+equivalen to udba=reval case. -diff --git a/Documentation/filesystems/aufs/design/06fhsm.txt b/Documentation/filesystems/aufs/design/06fhsm.txt -new file mode 100644 -index 000000000000..8b498d0af812 ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/06fhsm.txt -@@ -0,0 +1,120 @@ -+ -+# Copyright (C) 2011-2019 Junjiro R. Okajima -+# -+# This program is free software; you can redistribute it and/or modify -+# it under the terms of the GNU General Public License as published by -+# the Free Software Foundation; either version 2 of the License, or -+# (at your option) any later version. -+# -+# This program is distributed in the hope that it will be useful, -+# but WITHOUT ANY WARRANTY; without even the implied warranty of -+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+# GNU General Public License for more details. -+# -+# You should have received a copy of the GNU General Public License -+# along with this program; if not, write to the Free Software -+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA -+ -+ -+File-based Hierarchical Storage Management (FHSM) -+---------------------------------------------------------------------- -+Hierarchical Storage Management (or HSM) is a well-known feature in the -+storage world. Aufs provides this feature as file-based with multiple -+writable branches, based upon the principle of "Colder, the Lower". -+Here the word "colder" means that the less used files, and "lower" means -+that the position in the order of the stacked branches vertically. -+These multiple writable branches are prioritized, ie. the topmost one -+should be the fastest drive and be used heavily. -+ -+o Characters in aufs FHSM story -+- aufs itself and a new branch attribute. -+- a new ioctl interface to move-down and to establish a connection with -+ the daemon ("move-down" is a converse of "copy-up"). -+- userspace tool and daemon. -+ -+The userspace daemon establishes a connection with aufs and waits for -+the notification. The notified information is very similar to struct -+statfs containing the number of consumed blocks and inodes. -+When the consumed blocks/inodes of a branch exceeds the user-specified -+upper watermark, the daemon activates its move-down process until the -+consumed blocks/inodes reaches the user-specified lower watermark. -+ -+The actual move-down is done by aufs based upon the request from -+user-space since we need to maintain the inode number and the internal -+pointer arrays in aufs. -+ -+Currently aufs FHSM handles the regular files only. Additionally they -+must not be hard-linked nor pseudo-linked. -+ -+ -+o Cowork of aufs and the user-space daemon -+ During the userspace daemon established the connection, aufs sends a -+ small notification to it whenever aufs writes something into the -+ writable branch. But it may cost high since aufs issues statfs(2) -+ internally. So user can specify a new option to cache the -+ info. Actually the notification is controlled by these factors. -+ + the specified cache time. -+ + classified as "force" by aufs internally. -+ Until the specified time expires, aufs doesn't send the info -+ except the forced cases. When aufs decide forcing, the info is always -+ notified to userspace. -+ For example, the number of free inodes is generally large enough and -+ the shortage of it happens rarely. So aufs doesn't force the -+ notification when creating a new file, directory and others. This is -+ the typical case which aufs doesn't force. -+ When aufs writes the actual filedata and the files consumes any of new -+ blocks, the aufs forces notifying. -+ -+ -+o Interfaces in aufs -+- New branch attribute. -+ + fhsm -+ Specifies that the branch is managed by FHSM feature. In other word, -+ participant in the FHSM. -+ When nofhsm is set to the branch, it will not be the source/target -+ branch of the move-down operation. This attribute is set -+ independently from coo and moo attributes, and if you want full -+ FHSM, you should specify them as well. -+- New mount option. -+ + fhsm_sec -+ Specifies a second to suppress many less important info to be -+ notified. -+- New ioctl. -+ + AUFS_CTL_FHSM_FD -+ create a new file descriptor which userspace can read the notification -+ (a subset of struct statfs) from aufs. -+- Module parameter 'brs' -+ It has to be set to 1. Otherwise the new mount option 'fhsm' will not -+ be set. -+- mount helpers /sbin/mount.aufs and /sbin/umount.aufs -+ When there are two or more branches with fhsm attributes, -+ /sbin/mount.aufs invokes the user-space daemon and /sbin/umount.aufs -+ terminates it. As a result of remounting and branch-manipulation, the -+ number of branches with fhsm attribute can be one. In this case, -+ /sbin/mount.aufs will terminate the user-space daemon. -+ -+ -+Finally the operation is done as these steps in kernel-space. -+- make sure that, -+ + no one else is using the file. -+ + the file is not hard-linked. -+ + the file is not pseudo-linked. -+ + the file is a regular file. -+ + the parent dir is not opaqued. -+- find the target writable branch. -+- make sure the file is not whiteout-ed by the upper (than the target) -+ branch. -+- make the parent dir on the target branch. -+- mutex lock the inode on the branch. -+- unlink the whiteout on the target branch (if exists). -+- lookup and create the whiteout-ed temporary name on the target branch. -+- copy the file as the whiteout-ed temporary name on the target branch. -+- rename the whiteout-ed temporary name to the original name. -+- unlink the file on the source branch. -+- maintain the internal pointer array and the external inode number -+ table (XINO). -+- maintain the timestamps and other attributes of the parent dir and the -+ file. -+ -+And of course, in every step, an error may happen. So the operation -+should restore the original file state after an error happens. -diff --git a/Documentation/filesystems/aufs/design/06mmap.txt b/Documentation/filesystems/aufs/design/06mmap.txt -new file mode 100644 -index 000000000000..cdd84ea777fc ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/06mmap.txt -@@ -0,0 +1,72 @@ -+ -+# Copyright (C) 2005-2019 Junjiro R. Okajima -+# -+# This program is free software; you can redistribute it and/or modify -+# it under the terms of the GNU General Public License as published by -+# the Free Software Foundation; either version 2 of the License, or -+# (at your option) any later version. -+# -+# This program is distributed in the hope that it will be useful, -+# but WITHOUT ANY WARRANTY; without even the implied warranty of -+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+# GNU General Public License for more details. -+# -+# You should have received a copy of the GNU General Public License -+# along with this program. If not, see <http://www.gnu.org/licenses/>. -+ -+mmap(2) -- File Memory Mapping -+---------------------------------------------------------------------- -+In aufs, the file-mapped pages are handled by a branch fs directly, no -+interaction with aufs. It means aufs_mmap() calls the branch fs's -+->mmap(). -+This approach is simple and good, but there is one problem. -+Under /proc, several entries show the mmapped files by its path (with -+device and inode number), and the printed path will be the path on the -+branch fs's instead of virtual aufs's. -+This is not a problem in most cases, but some utilities lsof(1) (and its -+user) may expect the path on aufs. -+ -+To address this issue, aufs adds a new member called vm_prfile in struct -+vm_area_struct (and struct vm_region). The original vm_file points to -+the file on the branch fs in order to handle everything correctly as -+usual. The new vm_prfile points to a virtual file in aufs, and the -+show-functions in procfs refers to vm_prfile if it is set. -+Also we need to maintain several other places where touching vm_file -+such like -+- fork()/clone() copies vma and the reference count of vm_file is -+ incremented. -+- merging vma maintains the ref count too. -+ -+This is not a good approach. It just fakes the printed path. But it -+leaves all behaviour around f_mapping unchanged. This is surely an -+advantage. -+Actually aufs had adopted another complicated approach which calls -+generic_file_mmap() and handles struct vm_operations_struct. In this -+approach, aufs met a hard problem and I could not solve it without -+switching the approach. -+ -+There may be one more another approach which is -+- bind-mount the branch-root onto the aufs-root internally -+- grab the new vfsmount (ie. struct mount) -+- lazy-umount the branch-root internally -+- in open(2) the aufs-file, open the branch-file with the hidden -+ vfsmount (instead of the original branch's vfsmount) -+- ideally this "bind-mount and lazy-umount" should be done atomically, -+ but it may be possible from userspace by the mount helper. -+ -+Adding the internal hidden vfsmount and using it in opening a file, the -+file path under /proc will be printed correctly. This approach looks -+smarter, but is not possible I am afraid. -+- aufs-root may be bind-mount later. when it happens, another hidden -+ vfsmount will be required. -+- it is hard to get the chance to bind-mount and lazy-umount -+ + in kernel-space, FS can have vfsmount in open(2) via -+ file->f_path, and aufs can know its vfsmount. But several locks are -+ already acquired, and if aufs tries to bind-mount and lazy-umount -+ here, then it may cause a deadlock. -+ + in user-space, bind-mount doesn't invoke the mount helper. -+- since /proc shows dev and ino, aufs has to give vma these info. it -+ means a new member vm_prinode will be necessary. this is essentially -+ equivalent to vm_prfile described above. -+ -+I have to give up this "looks-smater" approach. -diff --git a/Documentation/filesystems/aufs/design/06xattr.txt b/Documentation/filesystems/aufs/design/06xattr.txt -new file mode 100644 -index 000000000000..edd7553f3289 ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/06xattr.txt -@@ -0,0 +1,96 @@ -+ -+# Copyright (C) 2014-2019 Junjiro R. Okajima -+# -+# This program is free software; you can redistribute it and/or modify -+# it under the terms of the GNU General Public License as published by -+# the Free Software Foundation; either version 2 of the License, or -+# (at your option) any later version. -+# -+# This program is distributed in the hope that it will be useful, -+# but WITHOUT ANY WARRANTY; without even the implied warranty of -+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+# GNU General Public License for more details. -+# -+# You should have received a copy of the GNU General Public License -+# along with this program; if not, write to the Free Software -+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA -+ -+ -+Listing XATTR/EA and getting the value -+---------------------------------------------------------------------- -+For the inode standard attributes (owner, group, timestamps, etc.), aufs -+shows the values from the topmost existing file. This behaviour is good -+for the non-dir entries since the bahaviour exactly matches the shown -+information. But for the directories, aufs considers all the same named -+entries on the lower branches. Which means, if one of the lower entry -+rejects readdir call, then aufs returns an error even if the topmost -+entry allows it. This behaviour is necessary to respect the branch fs's -+security, but can make users confused since the user-visible standard -+attributes don't match the behaviour. -+To address this issue, aufs has a mount option called dirperm1 which -+checks the permission for the topmost entry only, and ignores the lower -+entry's permission. -+ -+A similar issue can happen around XATTR. -+getxattr(2) and listxattr(2) families behave as if dirperm1 option is -+always set. Otherwise these very unpleasant situation would happen. -+- listxattr(2) may return the duplicated entries. -+- users may not be able to remove or reset the XATTR forever, -+ -+ -+XATTR/EA support in the internal (copy,move)-(up,down) -+---------------------------------------------------------------------- -+Generally the extended attributes of inode are categorized as these. -+- "security" for LSM and capability. -+- "system" for posix ACL, 'acl' mount option is required for the branch -+ fs generally. -+- "trusted" for userspace, CAP_SYS_ADMIN is required. -+- "user" for userspace, 'user_xattr' mount option is required for the -+ branch fs generally. -+ -+Moreover there are some other categories. Aufs handles these rather -+unpopular categories as the ordinary ones, ie. there is no special -+condition nor exception. -+ -+In copy-up, the support for XATTR on the dst branch may differ from the -+src branch. In this case, the copy-up operation will get an error and -+the original user operation which triggered the copy-up will fail. It -+can happen that even all copy-up will fail. -+When both of src and dst branches support XATTR and if an error occurs -+during copying XATTR, then the copy-up should fail obviously. That is a -+good reason and aufs should return an error to userspace. But when only -+the src branch support that XATTR, aufs should not return an error. -+For example, the src branch supports ACL but the dst branch doesn't -+because the dst branch may natively un-support it or temporary -+un-support it due to "noacl" mount option. Of course, the dst branch fs -+may NOT return an error even if the XATTR is not supported. It is -+totally up to the branch fs. -+ -+Anyway when the aufs internal copy-up gets an error from the dst branch -+fs, then aufs tries removing the just copied entry and returns the error -+to the userspace. The worst case of this situation will be all copy-up -+will fail. -+ -+For the copy-up operation, there two basic approaches. -+- copy the specified XATTR only (by category above), and return the -+ error unconditionally if it happens. -+- copy all XATTR, and ignore the error on the specified category only. -+ -+In order to support XATTR and to implement the correct behaviour, aufs -+chooses the latter approach and introduces some new branch attributes, -+"icexsec", "icexsys", "icextr", "icexusr", and "icexoth". -+They correspond to the XATTR namespaces (see above). Additionally, to be -+convenient, "icex" is also provided which means all "icex*" attributes -+are set (here the word "icex" stands for "ignore copy-error on XATTR"). -+ -+The meaning of these attributes is to ignore the error from setting -+XATTR on that branch. -+Note that aufs tries copying all XATTR unconditionally, and ignores the -+error from the dst branch according to the specified attributes. -+ -+Some XATTR may have its default value. The default value may come from -+the parent dir or the environment. If the default value is set at the -+file creating-time, it will be overwritten by copy-up. -+Some contradiction may happen I am afraid. -+Do we need another attribute to stop copying XATTR? I am unsure. For -+now, aufs implements the branch attributes to ignore the error. -diff --git a/Documentation/filesystems/aufs/design/07export.txt b/Documentation/filesystems/aufs/design/07export.txt -new file mode 100644 -index 000000000000..9b983f3dd78a ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/07export.txt -@@ -0,0 +1,58 @@ -+ -+# Copyright (C) 2005-2019 Junjiro R. Okajima -+# -+# This program is free software; you can redistribute it and/or modify -+# it under the terms of the GNU General Public License as published by -+# the Free Software Foundation; either version 2 of the License, or -+# (at your option) any later version. -+# -+# This program is distributed in the hope that it will be useful, -+# but WITHOUT ANY WARRANTY; without even the implied warranty of -+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+# GNU General Public License for more details. -+# -+# You should have received a copy of the GNU General Public License -+# along with this program. If not, see <http://www.gnu.org/licenses/>. -+ -+Export Aufs via NFS -+---------------------------------------------------------------------- -+Here is an approach. -+- like xino/xib, add a new file 'xigen' which stores aufs inode -+ generation. -+- iget_locked(): initialize aufs inode generation for a new inode, and -+ store it in xigen file. -+- destroy_inode(): increment aufs inode generation and store it in xigen -+ file. it is necessary even if it is not unlinked, because any data of -+ inode may be changed by UDBA. -+- encode_fh(): for a root dir, simply return FILEID_ROOT. otherwise -+ build file handle by -+ + branch id (4 bytes) -+ + superblock generation (4 bytes) -+ + inode number (4 or 8 bytes) -+ + parent dir inode number (4 or 8 bytes) -+ + inode generation (4 bytes)) -+ + return value of exportfs_encode_fh() for the parent on a branch (4 -+ bytes) -+ + file handle for a branch (by exportfs_encode_fh()) -+- fh_to_dentry(): -+ + find the index of a branch from its id in handle, and check it is -+ still exist in aufs. -+ + 1st level: get the inode number from handle and search it in cache. -+ + 2nd level: if not found in cache, get the parent inode number from -+ the handle and search it in cache. and then open the found parent -+ dir, find the matching inode number by vfs_readdir() and get its -+ name, and call lookup_one_len() for the target dentry. -+ + 3rd level: if the parent dir is not cached, call -+ exportfs_decode_fh() for a branch and get the parent on a branch, -+ build a pathname of it, convert it a pathname in aufs, call -+ path_lookup(). now aufs gets a parent dir dentry, then handle it as -+ the 2nd level. -+ + to open the dir, aufs needs struct vfsmount. aufs keeps vfsmount -+ for every branch, but not itself. to get this, (currently) aufs -+ searches in current->nsproxy->mnt_ns list. it may not be a good -+ idea, but I didn't get other approach. -+ + test the generation of the gotten inode. -+- every inode operation: they may get EBUSY due to UDBA. in this case, -+ convert it into ESTALE for NFSD. -+- readdir(): call lockdep_on/off() because filldir in NFSD calls -+ lookup_one_len(), vfs_getattr(), encode_fh() and others. -diff --git a/Documentation/filesystems/aufs/design/08shwh.txt b/Documentation/filesystems/aufs/design/08shwh.txt -new file mode 100644 -index 000000000000..647a86a65db7 ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/08shwh.txt -@@ -0,0 +1,52 @@ -+ -+# Copyright (C) 2005-2019 Junjiro R. Okajima -+# -+# This program is free software; you can redistribute it and/or modify -+# it under the terms of the GNU General Public License as published by -+# the Free Software Foundation; either version 2 of the License, or -+# (at your option) any later version. -+# -+# This program is distributed in the hope that it will be useful, -+# but WITHOUT ANY WARRANTY; without even the implied warranty of -+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+# GNU General Public License for more details. -+# -+# You should have received a copy of the GNU General Public License -+# along with this program. If not, see <http://www.gnu.org/licenses/>. -+ -+Show Whiteout Mode (shwh) -+---------------------------------------------------------------------- -+Generally aufs hides the name of whiteouts. But in some cases, to show -+them is very useful for users. For instance, creating a new middle layer -+(branch) by merging existing layers. -+ -+(borrowing aufs1 HOW-TO from a user, Michael Towers) -+When you have three branches, -+- Bottom: 'system', squashfs (underlying base system), read-only -+- Middle: 'mods', squashfs, read-only -+- Top: 'overlay', ram (tmpfs), read-write -+ -+The top layer is loaded at boot time and saved at shutdown, to preserve -+the changes made to the system during the session. -+When larger changes have been made, or smaller changes have accumulated, -+the size of the saved top layer data grows. At this point, it would be -+nice to be able to merge the two overlay branches ('mods' and 'overlay') -+and rewrite the 'mods' squashfs, clearing the top layer and thus -+restoring save and load speed. -+ -+This merging is simplified by the use of another aufs mount, of just the -+two overlay branches using the 'shwh' option. -+# mount -t aufs -o ro,shwh,br:/livesys/overlay=ro+wh:/livesys/mods=rr+wh \ -+ aufs /livesys/merge_union -+ -+A merged view of these two branches is then available at -+/livesys/merge_union, and the new feature is that the whiteouts are -+visible! -+Note that in 'shwh' mode the aufs mount must be 'ro', which will disable -+writing to all branches. Also the default mode for all branches is 'ro'. -+It is now possible to save the combined contents of the two overlay -+branches to a new squashfs, e.g.: -+# mksquashfs /livesys/merge_union /path/to/newmods.squash -+ -+This new squashfs archive can be stored on the boot device and the -+initramfs will use it to replace the old one at the next boot. -diff --git a/Documentation/filesystems/aufs/design/10dynop.txt b/Documentation/filesystems/aufs/design/10dynop.txt -new file mode 100644 -index 000000000000..13e8583f2b91 ---- /dev/null -+++ b/Documentation/filesystems/aufs/design/10dynop.txt -@@ -0,0 +1,47 @@ -+ -+# Copyright (C) 2010-2019 Junjiro R. Okajima -+# -+# This program is free software; you can redistribute it and/or modify -+# it under the terms of the GNU General Public License as published by -+# the Free Software Foundation; either version 2 of the License, or -+# (at your option) any later version. -+# -+# This program is distributed in the hope that it will be useful, -+# but WITHOUT ANY WARRANTY; without even the implied warranty of -+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+# GNU General Public License for more details. -+# -+# You should have received a copy of the GNU General Public License -+# along with this program. If not, see <http://www.gnu.org/licenses/>. -+ -+Dynamically customizable FS operations -+---------------------------------------------------------------------- -+Generally FS operations (struct inode_operations, struct -+address_space_operations, struct file_operations, etc.) are defined as -+"static const", but it never means that FS have only one set of -+operation. Some FS have multiple sets of them. For instance, ext2 has -+three sets, one for XIP, for NOBH, and for normal. -+Since aufs overrides and redirects these operations, sometimes aufs has -+to change its behaviour according to the branch FS type. More importantly -+VFS acts differently if a function (member in the struct) is set or -+not. It means aufs should have several sets of operations and select one -+among them according to the branch FS definition. -+ -+In order to solve this problem and not to affect the behaviour of VFS, -+aufs defines these operations dynamically. For instance, aufs defines -+dummy direct_IO function for struct address_space_operations, but it may -+not be set to the address_space_operations actually. When the branch FS -+doesn't have it, aufs doesn't set it to its address_space_operations -+while the function definition itself is still alive. So the behaviour -+itself will not change, and it will return an error when direct_IO is -+not set. -+ -+The lifetime of these dynamically generated operation object is -+maintained by aufs branch object. When the branch is removed from aufs, -+the reference counter of the object is decremented. When it reaches -+zero, the dynamically generated operation object will be freed. -+ -+This approach is designed to support AIO (io_submit), Direct I/O and -+XIP (DAX) mainly. -+Currently this approach is applied to address_space_operations for -+regular files only. -diff --git a/fs/aufs/Kconfig b/fs/aufs/Kconfig -new file mode 100644 -index 000000000000..9f436425716a ---- /dev/null -+++ b/fs/aufs/Kconfig -@@ -0,0 +1,199 @@ -+# SPDX-License-Identifier: GPL-2.0 -+config AUFS_FS -+ tristate "Aufs (Advanced multi layered unification filesystem) support" -+ help -+ Aufs is a stackable unification filesystem such as Unionfs, -+ which unifies several directories and provides a merged single -+ directory. -+ In the early days, aufs was entirely re-designed and -+ re-implemented Unionfs Version 1.x series. Introducing many -+ original ideas, approaches and improvements, it becomes totally -+ different from Unionfs while keeping the basic features. -+ -+if AUFS_FS -+choice -+ prompt "Maximum number of branches" -+ default AUFS_BRANCH_MAX_127 -+ help -+ Specifies the maximum number of branches (or member directories) -+ in a single aufs. The larger value consumes more system -+ resources and has a minor impact to performance. -+config AUFS_BRANCH_MAX_127 -+ bool "127" -+ help -+ Specifies the maximum number of branches (or member directories) -+ in a single aufs. The larger value consumes more system -+ resources and has a minor impact to performance. -+config AUFS_BRANCH_MAX_511 -+ bool "511" -+ help -+ Specifies the maximum number of branches (or member directories) -+ in a single aufs. The larger value consumes more system -+ resources and has a minor impact to performance. -+config AUFS_BRANCH_MAX_1023 -+ bool "1023" -+ help -+ Specifies the maximum number of branches (or member directories) -+ in a single aufs. The larger value consumes more system -+ resources and has a minor impact to performance. -+config AUFS_BRANCH_MAX_32767 -+ bool "32767" -+ help -+ Specifies the maximum number of branches (or member directories) -+ in a single aufs. The larger value consumes more system -+ resources and has a minor impact to performance. -+endchoice -+ -+config AUFS_SBILIST -+ bool -+ depends on AUFS_MAGIC_SYSRQ || PROC_FS -+ default y -+ help -+ Automatic configuration for internal use. -+ When aufs supports Magic SysRq or /proc, enabled automatically. -+ -+config AUFS_HNOTIFY -+ bool "Detect direct branch access (bypassing aufs)" -+ help -+ If you want to modify files on branches directly, eg. bypassing aufs, -+ and want aufs to detect the changes of them fully, then enable this -+ option and use 'udba=notify' mount option. -+ Currently there is only one available configuration, "fsnotify". -+ It will have a negative impact to the performance. -+ See detail in aufs.5. -+ -+choice -+ prompt "method" if AUFS_HNOTIFY -+ default AUFS_HFSNOTIFY -+config AUFS_HFSNOTIFY -+ bool "fsnotify" -+ select FSNOTIFY -+endchoice -+ -+config AUFS_EXPORT -+ bool "NFS-exportable aufs" -+ depends on EXPORTFS -+ help -+ If you want to export your mounted aufs via NFS, then enable this -+ option. There are several requirements for this configuration. -+ See detail in aufs.5. -+ -+config AUFS_INO_T_64 -+ bool -+ depends on AUFS_EXPORT -+ depends on 64BIT && !(ALPHA || S390) -+ default y -+ help -+ Automatic configuration for internal use. -+ /* typedef unsigned long/int __kernel_ino_t */ -+ /* alpha and s390x are int */ -+ -+config AUFS_XATTR -+ bool "support for XATTR/EA (including Security Labels)" -+ help -+ If your branch fs supports XATTR/EA and you want to make them -+ available in aufs too, then enable this opsion and specify the -+ branch attributes for EA. -+ See detail in aufs.5. -+ -+config AUFS_FHSM -+ bool "File-based Hierarchical Storage Management" -+ help -+ Hierarchical Storage Management (or HSM) is a well-known feature -+ in the storage world. Aufs provides this feature as file-based. -+ with multiple branches. -+ These multiple branches are prioritized, ie. the topmost one -+ should be the fastest drive and be used heavily. -+ -+config AUFS_RDU -+ bool "Readdir in userspace" -+ help -+ Aufs has two methods to provide a merged view for a directory, -+ by a user-space library and by kernel-space natively. The latter -+ is always enabled but sometimes large and slow. -+ If you enable this option, install the library in aufs2-util -+ package, and set some environment variables for your readdir(3), -+ then the work will be handled in user-space which generally -+ shows better performance in most cases. -+ See detail in aufs.5. -+ -+config AUFS_DIRREN -+ bool "Workaround for rename(2)-ing a directory" -+ help -+ By default, aufs returns EXDEV error in renameing a dir who has -+ his child on the lower branch, since it is a bad idea to issue -+ rename(2) internally for every lower branch. But user may not -+ accept this behaviour. So here is a workaround to allow such -+ rename(2) and store some extra infromation on the writable -+ branch. Obviously this costs high (and I don't like it). -+ To use this feature, you need to enable this configuration AND -+ to specify the mount option `dirren.' -+ See details in aufs.5 and the design documents. -+ -+config AUFS_SHWH -+ bool "Show whiteouts" -+ help -+ If you want to make the whiteouts in aufs visible, then enable -+ this option and specify 'shwh' mount option. Although it may -+ sounds like philosophy or something, but in technically it -+ simply shows the name of whiteout with keeping its behaviour. -+ -+config AUFS_BR_RAMFS -+ bool "Ramfs (initramfs/rootfs) as an aufs branch" -+ help -+ If you want to use ramfs as an aufs branch fs, then enable this -+ option. Generally tmpfs is recommended. -+ Aufs prohibited them to be a branch fs by default, because -+ initramfs becomes unusable after switch_root or something -+ generally. If you sets initramfs as an aufs branch and boot your -+ system by switch_root, you will meet a problem easily since the -+ files in initramfs may be inaccessible. -+ Unless you are going to use ramfs as an aufs branch fs without -+ switch_root or something, leave it N. -+ -+config AUFS_BR_FUSE -+ bool "Fuse fs as an aufs branch" -+ depends on FUSE_FS -+ select AUFS_POLL -+ help -+ If you want to use fuse-based userspace filesystem as an aufs -+ branch fs, then enable this option. -+ It implements the internal poll(2) operation which is -+ implemented by fuse only (curretnly). -+ -+config AUFS_POLL -+ bool -+ help -+ Automatic configuration for internal use. -+ -+config AUFS_BR_HFSPLUS -+ bool "Hfsplus as an aufs branch" -+ depends on HFSPLUS_FS -+ default y -+ help -+ If you want to use hfsplus fs as an aufs branch fs, then enable -+ this option. This option introduces a small overhead at -+ copying-up a file on hfsplus. -+ -+config AUFS_BDEV_LOOP -+ bool -+ depends on BLK_DEV_LOOP -+ default y -+ help -+ Automatic configuration for internal use. -+ Convert =[ym] into =y. -+ -+config AUFS_DEBUG -+ bool "Debug aufs" -+ help -+ Enable this to compile aufs internal debug code. -+ It will have a negative impact to the performance. -+ -+config AUFS_MAGIC_SYSRQ -+ bool -+ depends on AUFS_DEBUG && MAGIC_SYSRQ -+ default y -+ help -+ Automatic configuration for internal use. -+ When aufs supports Magic SysRq, enabled automatically. -+endif -diff --git a/fs/aufs/Makefile b/fs/aufs/Makefile -new file mode 100644 -index 000000000000..2c819a64935e ---- /dev/null -+++ b/fs/aufs/Makefile -@@ -0,0 +1,46 @@ -+# SPDX-License-Identifier: GPL-2.0 -+ -+include ${src}/magic.mk -+ifeq (${CONFIG_AUFS_FS},m) -+include ${src}/conf.mk -+endif -+-include ${src}/priv_def.mk -+ -+# cf. include/linux/kernel.h -+# enable pr_debug -+ccflags-y += -DDEBUG -+# sparse requires the full pathname -+ifdef M -+ccflags-y += -include ${M}/../../include/uapi/linux/aufs_type.h -+else -+ccflags-y += -include ${srctree}/include/uapi/linux/aufs_type.h -+endif -+ -+obj-$(CONFIG_AUFS_FS) += aufs.o -+aufs-y := module.o sbinfo.o super.o branch.o xino.o sysaufs.o opts.o \ -+ wkq.o vfsub.o dcsub.o \ -+ cpup.o whout.o wbr_policy.o \ -+ dinfo.o dentry.o \ -+ dynop.o \ -+ finfo.o file.o f_op.o \ -+ dir.o vdir.o \ -+ iinfo.o inode.o i_op.o i_op_add.o i_op_del.o i_op_ren.o \ -+ mvdown.o ioctl.o -+ -+# all are boolean -+aufs-$(CONFIG_PROC_FS) += procfs.o plink.o -+aufs-$(CONFIG_SYSFS) += sysfs.o -+aufs-$(CONFIG_DEBUG_FS) += dbgaufs.o -+aufs-$(CONFIG_AUFS_BDEV_LOOP) += loop.o -+aufs-$(CONFIG_AUFS_HNOTIFY) += hnotify.o -+aufs-$(CONFIG_AUFS_HFSNOTIFY) += hfsnotify.o -+aufs-$(CONFIG_AUFS_EXPORT) += export.o -+aufs-$(CONFIG_AUFS_XATTR) += xattr.o -+aufs-$(CONFIG_FS_POSIX_ACL) += posix_acl.o -+aufs-$(CONFIG_AUFS_DIRREN) += dirren.o -+aufs-$(CONFIG_AUFS_FHSM) += fhsm.o -+aufs-$(CONFIG_AUFS_POLL) += poll.o -+aufs-$(CONFIG_AUFS_RDU) += rdu.o -+aufs-$(CONFIG_AUFS_BR_HFSPLUS) += hfsplus.o -+aufs-$(CONFIG_AUFS_DEBUG) += debug.o -+aufs-$(CONFIG_AUFS_MAGIC_SYSRQ) += sysrq.o -diff --git a/fs/aufs/aufs.h b/fs/aufs/aufs.h -new file mode 100644 -index 000000000000..a62a85211b88 ---- /dev/null -+++ b/fs/aufs/aufs.h -@@ -0,0 +1,62 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * all header files -+ */ -+ -+#ifndef __AUFS_H__ -+#define __AUFS_H__ -+ -+#ifdef __KERNEL__ -+ -+#define AuStub(type, name, body, ...) \ -+ static inline type name(__VA_ARGS__) { body; } -+ -+#define AuStubVoid(name, ...) \ -+ AuStub(void, name, , __VA_ARGS__) -+#define AuStubInt0(name, ...) \ -+ AuStub(int, name, return 0, __VA_ARGS__) -+ -+#include "debug.h" -+ -+#include "branch.h" -+#include "cpup.h" -+#include "dcsub.h" -+#include "dbgaufs.h" -+#include "dentry.h" -+#include "dir.h" -+#include "dirren.h" -+#include "dynop.h" -+#include "file.h" -+#include "fstype.h" -+#include "hbl.h" -+#include "inode.h" -+#include "lcnt.h" -+#include "loop.h" -+#include "module.h" -+#include "opts.h" -+#include "rwsem.h" -+#include "super.h" -+#include "sysaufs.h" -+#include "vfsub.h" -+#include "whout.h" -+#include "wkq.h" -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_H__ */ -diff --git a/fs/aufs/branch.c b/fs/aufs/branch.c -new file mode 100644 -index 000000000000..fb388a049940 ---- /dev/null -+++ b/fs/aufs/branch.c -@@ -0,0 +1,1423 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * branch management -+ */ -+ -+#include <linux/compat.h> -+#include <linux/statfs.h> -+#include "aufs.h" -+ -+/* -+ * free a single branch -+ */ -+static void au_br_do_free(struct au_branch *br) -+{ -+ int i; -+ struct au_wbr *wbr; -+ struct au_dykey **key; -+ -+ au_hnotify_fin_br(br); -+ /* always, regardless the mount option */ -+ au_dr_hino_free(&br->br_dirren); -+ au_xino_put(br); -+ -+ AuLCntZero(au_lcnt_read(&br->br_nfiles, /*do_rev*/0)); -+ au_lcnt_fin(&br->br_nfiles, /*do_sync*/0); -+ AuLCntZero(au_lcnt_read(&br->br_count, /*do_rev*/0)); -+ au_lcnt_fin(&br->br_count, /*do_sync*/0); -+ -+ wbr = br->br_wbr; -+ if (wbr) { -+ for (i = 0; i < AuBrWh_Last; i++) -+ dput(wbr->wbr_wh[i]); -+ AuDebugOn(atomic_read(&wbr->wbr_wh_running)); -+ AuRwDestroy(&wbr->wbr_wh_rwsem); -+ } -+ -+ if (br->br_fhsm) { -+ au_br_fhsm_fin(br->br_fhsm); -+ au_kfree_try_rcu(br->br_fhsm); -+ } -+ -+ key = br->br_dykey; -+ for (i = 0; i < AuBrDynOp; i++, key++) -+ if (*key) -+ au_dy_put(*key); -+ else -+ break; -+ -+ /* recursive lock, s_umount of branch's */ -+ /* synchronize_rcu(); */ /* why? */ -+ lockdep_off(); -+ path_put(&br->br_path); -+ lockdep_on(); -+ au_kfree_rcu(wbr); -+ au_lcnt_wait_for_fin(&br->br_nfiles); -+ au_lcnt_wait_for_fin(&br->br_count); -+ /* I don't know why, but percpu_refcount requires this */ -+ /* synchronize_rcu(); */ -+ au_kfree_rcu(br); -+} -+ -+/* -+ * frees all branches -+ */ -+void au_br_free(struct au_sbinfo *sbinfo) -+{ -+ aufs_bindex_t bmax; -+ struct au_branch **br; -+ -+ AuRwMustWriteLock(&sbinfo->si_rwsem); -+ -+ bmax = sbinfo->si_bbot + 1; -+ br = sbinfo->si_branch; -+ while (bmax--) -+ au_br_do_free(*br++); -+} -+ -+/* -+ * find the index of a branch which is specified by @br_id. -+ */ -+int au_br_index(struct super_block *sb, aufs_bindex_t br_id) -+{ -+ aufs_bindex_t bindex, bbot; -+ -+ bbot = au_sbbot(sb); -+ for (bindex = 0; bindex <= bbot; bindex++) -+ if (au_sbr_id(sb, bindex) == br_id) -+ return bindex; -+ return -1; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * add a branch -+ */ -+ -+static int test_overlap(struct super_block *sb, struct dentry *h_adding, -+ struct dentry *h_root) -+{ -+ if (unlikely(h_adding == h_root -+ || au_test_loopback_overlap(sb, h_adding))) -+ return 1; -+ if (h_adding->d_sb != h_root->d_sb) -+ return 0; -+ return au_test_subdir(h_adding, h_root) -+ || au_test_subdir(h_root, h_adding); -+} -+ -+/* -+ * returns a newly allocated branch. @new_nbranch is a number of branches -+ * after adding a branch. -+ */ -+static struct au_branch *au_br_alloc(struct super_block *sb, int new_nbranch, -+ int perm) -+{ -+ struct au_branch *add_branch; -+ struct dentry *root; -+ struct inode *inode; -+ int err; -+ -+ err = -ENOMEM; -+ add_branch = kzalloc(sizeof(*add_branch), GFP_NOFS); -+ if (unlikely(!add_branch)) -+ goto out; -+ add_branch->br_xino = au_xino_alloc(/*nfile*/1); -+ if (unlikely(!add_branch->br_xino)) -+ goto out_br; -+ err = au_hnotify_init_br(add_branch, perm); -+ if (unlikely(err)) -+ goto out_xino; -+ -+ if (au_br_writable(perm)) { -+ /* may be freed separately at changing the branch permission */ -+ add_branch->br_wbr = kzalloc(sizeof(*add_branch->br_wbr), -+ GFP_NOFS); -+ if (unlikely(!add_branch->br_wbr)) -+ goto out_hnotify; -+ } -+ -+ if (au_br_fhsm(perm)) { -+ err = au_fhsm_br_alloc(add_branch); -+ if (unlikely(err)) -+ goto out_wbr; -+ } -+ -+ root = sb->s_root; -+ err = au_sbr_realloc(au_sbi(sb), new_nbranch, /*may_shrink*/0); -+ if (!err) -+ err = au_di_realloc(au_di(root), new_nbranch, /*may_shrink*/0); -+ if (!err) { -+ inode = d_inode(root); -+ err = au_hinode_realloc(au_ii(inode), new_nbranch, -+ /*may_shrink*/0); -+ } -+ if (!err) -+ return add_branch; /* success */ -+ -+out_wbr: -+ au_kfree_rcu(add_branch->br_wbr); -+out_hnotify: -+ au_hnotify_fin_br(add_branch); -+out_xino: -+ au_xino_put(add_branch); -+out_br: -+ au_kfree_rcu(add_branch); -+out: -+ return ERR_PTR(err); -+} -+ -+/* -+ * test if the branch permission is legal or not. -+ */ -+static int test_br(struct inode *inode, int brperm, char *path) -+{ -+ int err; -+ -+ err = (au_br_writable(brperm) && IS_RDONLY(inode)); -+ if (!err) -+ goto out; -+ -+ err = -EINVAL; -+ pr_err("write permission for readonly mount or inode, %s\n", path); -+ -+out: -+ return err; -+} -+ -+/* -+ * returns: -+ * 0: success, the caller will add it -+ * plus: success, it is already unified, the caller should ignore it -+ * minus: error -+ */ -+static int test_add(struct super_block *sb, struct au_opt_add *add, int remount) -+{ -+ int err; -+ aufs_bindex_t bbot, bindex; -+ struct dentry *root, *h_dentry; -+ struct inode *inode, *h_inode; -+ -+ root = sb->s_root; -+ bbot = au_sbbot(sb); -+ if (unlikely(bbot >= 0 -+ && au_find_dbindex(root, add->path.dentry) >= 0)) { -+ err = 1; -+ if (!remount) { -+ err = -EINVAL; -+ pr_err("%s duplicated\n", add->pathname); -+ } -+ goto out; -+ } -+ -+ err = -ENOSPC; /* -E2BIG; */ -+ if (unlikely(AUFS_BRANCH_MAX <= add->bindex -+ || AUFS_BRANCH_MAX - 1 <= bbot)) { -+ pr_err("number of branches exceeded %s\n", add->pathname); -+ goto out; -+ } -+ -+ err = -EDOM; -+ if (unlikely(add->bindex < 0 || bbot + 1 < add->bindex)) { -+ pr_err("bad index %d\n", add->bindex); -+ goto out; -+ } -+ -+ inode = d_inode(add->path.dentry); -+ err = -ENOENT; -+ if (unlikely(!inode->i_nlink)) { -+ pr_err("no existence %s\n", add->pathname); -+ goto out; -+ } -+ -+ err = -EINVAL; -+ if (unlikely(inode->i_sb == sb)) { -+ pr_err("%s must be outside\n", add->pathname); -+ goto out; -+ } -+ -+ if (unlikely(au_test_fs_unsuppoted(inode->i_sb))) { -+ pr_err("unsupported filesystem, %s (%s)\n", -+ add->pathname, au_sbtype(inode->i_sb)); -+ goto out; -+ } -+ -+ if (unlikely(inode->i_sb->s_stack_depth)) { -+ pr_err("already stacked, %s (%s)\n", -+ add->pathname, au_sbtype(inode->i_sb)); -+ goto out; -+ } -+ -+ err = test_br(d_inode(add->path.dentry), add->perm, add->pathname); -+ if (unlikely(err)) -+ goto out; -+ -+ if (bbot < 0) -+ return 0; /* success */ -+ -+ err = -EINVAL; -+ for (bindex = 0; bindex <= bbot; bindex++) -+ if (unlikely(test_overlap(sb, add->path.dentry, -+ au_h_dptr(root, bindex)))) { -+ pr_err("%s is overlapped\n", add->pathname); -+ goto out; -+ } -+ -+ err = 0; -+ if (au_opt_test(au_mntflags(sb), WARN_PERM)) { -+ h_dentry = au_h_dptr(root, 0); -+ h_inode = d_inode(h_dentry); -+ if ((h_inode->i_mode & S_IALLUGO) != (inode->i_mode & S_IALLUGO) -+ || !uid_eq(h_inode->i_uid, inode->i_uid) -+ || !gid_eq(h_inode->i_gid, inode->i_gid)) -+ pr_warn("uid/gid/perm %s %u/%u/0%o, %u/%u/0%o\n", -+ add->pathname, -+ i_uid_read(inode), i_gid_read(inode), -+ (inode->i_mode & S_IALLUGO), -+ i_uid_read(h_inode), i_gid_read(h_inode), -+ (h_inode->i_mode & S_IALLUGO)); -+ } -+ -+out: -+ return err; -+} -+ -+/* -+ * initialize or clean the whiteouts for an adding branch -+ */ -+static int au_br_init_wh(struct super_block *sb, struct au_branch *br, -+ int new_perm) -+{ -+ int err, old_perm; -+ aufs_bindex_t bindex; -+ struct inode *h_inode; -+ struct au_wbr *wbr; -+ struct au_hinode *hdir; -+ struct dentry *h_dentry; -+ -+ err = vfsub_mnt_want_write(au_br_mnt(br)); -+ if (unlikely(err)) -+ goto out; -+ -+ wbr = br->br_wbr; -+ old_perm = br->br_perm; -+ br->br_perm = new_perm; -+ hdir = NULL; -+ h_inode = NULL; -+ bindex = au_br_index(sb, br->br_id); -+ if (0 <= bindex) { -+ hdir = au_hi(d_inode(sb->s_root), bindex); -+ au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); -+ } else { -+ h_dentry = au_br_dentry(br); -+ h_inode = d_inode(h_dentry); -+ inode_lock_nested(h_inode, AuLsc_I_PARENT); -+ } -+ if (!wbr) -+ err = au_wh_init(br, sb); -+ else { -+ wbr_wh_write_lock(wbr); -+ err = au_wh_init(br, sb); -+ wbr_wh_write_unlock(wbr); -+ } -+ if (hdir) -+ au_hn_inode_unlock(hdir); -+ else -+ inode_unlock(h_inode); -+ vfsub_mnt_drop_write(au_br_mnt(br)); -+ br->br_perm = old_perm; -+ -+ if (!err && wbr && !au_br_writable(new_perm)) { -+ au_kfree_rcu(wbr); -+ br->br_wbr = NULL; -+ } -+ -+out: -+ return err; -+} -+ -+static int au_wbr_init(struct au_branch *br, struct super_block *sb, -+ int perm) -+{ -+ int err; -+ struct kstatfs kst; -+ struct au_wbr *wbr; -+ -+ wbr = br->br_wbr; -+ au_rw_init(&wbr->wbr_wh_rwsem); -+ atomic_set(&wbr->wbr_wh_running, 0); -+ -+ /* -+ * a limit for rmdir/rename a dir -+ * cf. AUFS_MAX_NAMELEN in include/uapi/linux/aufs_type.h -+ */ -+ err = vfs_statfs(&br->br_path, &kst); -+ if (unlikely(err)) -+ goto out; -+ err = -EINVAL; -+ if (kst.f_namelen >= NAME_MAX) -+ err = au_br_init_wh(sb, br, perm); -+ else -+ pr_err("%pd(%s), unsupported namelen %ld\n", -+ au_br_dentry(br), -+ au_sbtype(au_br_dentry(br)->d_sb), kst.f_namelen); -+ -+out: -+ return err; -+} -+ -+/* initialize a new branch */ -+static int au_br_init(struct au_branch *br, struct super_block *sb, -+ struct au_opt_add *add) -+{ -+ int err; -+ struct au_branch *brbase; -+ struct file *xf; -+ struct inode *h_inode; -+ -+ err = 0; -+ br->br_perm = add->perm; -+ br->br_path = add->path; /* set first, path_get() later */ -+ spin_lock_init(&br->br_dykey_lock); -+ au_lcnt_init(&br->br_nfiles, /*release*/NULL); -+ au_lcnt_init(&br->br_count, /*release*/NULL); -+ br->br_id = au_new_br_id(sb); -+ AuDebugOn(br->br_id < 0); -+ -+ /* always, regardless the given option */ -+ err = au_dr_br_init(sb, br, &add->path); -+ if (unlikely(err)) -+ goto out_err; -+ -+ if (au_br_writable(add->perm)) { -+ err = au_wbr_init(br, sb, add->perm); -+ if (unlikely(err)) -+ goto out_err; -+ } -+ -+ if (au_opt_test(au_mntflags(sb), XINO)) { -+ brbase = au_sbr(sb, 0); -+ xf = au_xino_file(brbase->br_xino, /*idx*/-1); -+ AuDebugOn(!xf); -+ h_inode = d_inode(add->path.dentry); -+ err = au_xino_init_br(sb, br, h_inode->i_ino, &xf->f_path); -+ if (unlikely(err)) { -+ AuDebugOn(au_xino_file(br->br_xino, /*idx*/-1)); -+ goto out_err; -+ } -+ } -+ -+ sysaufs_br_init(br); -+ path_get(&br->br_path); -+ goto out; /* success */ -+ -+out_err: -+ memset(&br->br_path, 0, sizeof(br->br_path)); -+out: -+ return err; -+} -+ -+static void au_br_do_add_brp(struct au_sbinfo *sbinfo, aufs_bindex_t bindex, -+ struct au_branch *br, aufs_bindex_t bbot, -+ aufs_bindex_t amount) -+{ -+ struct au_branch **brp; -+ -+ AuRwMustWriteLock(&sbinfo->si_rwsem); -+ -+ brp = sbinfo->si_branch + bindex; -+ memmove(brp + 1, brp, sizeof(*brp) * amount); -+ *brp = br; -+ sbinfo->si_bbot++; -+ if (unlikely(bbot < 0)) -+ sbinfo->si_bbot = 0; -+} -+ -+static void au_br_do_add_hdp(struct au_dinfo *dinfo, aufs_bindex_t bindex, -+ aufs_bindex_t bbot, aufs_bindex_t amount) -+{ -+ struct au_hdentry *hdp; -+ -+ AuRwMustWriteLock(&dinfo->di_rwsem); -+ -+ hdp = au_hdentry(dinfo, bindex); -+ memmove(hdp + 1, hdp, sizeof(*hdp) * amount); -+ au_h_dentry_init(hdp); -+ dinfo->di_bbot++; -+ if (unlikely(bbot < 0)) -+ dinfo->di_btop = 0; -+} -+ -+static void au_br_do_add_hip(struct au_iinfo *iinfo, aufs_bindex_t bindex, -+ aufs_bindex_t bbot, aufs_bindex_t amount) -+{ -+ struct au_hinode *hip; -+ -+ AuRwMustWriteLock(&iinfo->ii_rwsem); -+ -+ hip = au_hinode(iinfo, bindex); -+ memmove(hip + 1, hip, sizeof(*hip) * amount); -+ au_hinode_init(hip); -+ iinfo->ii_bbot++; -+ if (unlikely(bbot < 0)) -+ iinfo->ii_btop = 0; -+} -+ -+static void au_br_do_add(struct super_block *sb, struct au_branch *br, -+ aufs_bindex_t bindex) -+{ -+ struct dentry *root, *h_dentry; -+ struct inode *root_inode, *h_inode; -+ aufs_bindex_t bbot, amount; -+ -+ root = sb->s_root; -+ root_inode = d_inode(root); -+ bbot = au_sbbot(sb); -+ amount = bbot + 1 - bindex; -+ h_dentry = au_br_dentry(br); -+ au_sbilist_lock(); -+ au_br_do_add_brp(au_sbi(sb), bindex, br, bbot, amount); -+ au_br_do_add_hdp(au_di(root), bindex, bbot, amount); -+ au_br_do_add_hip(au_ii(root_inode), bindex, bbot, amount); -+ au_set_h_dptr(root, bindex, dget(h_dentry)); -+ h_inode = d_inode(h_dentry); -+ au_set_h_iptr(root_inode, bindex, au_igrab(h_inode), /*flags*/0); -+ au_sbilist_unlock(); -+} -+ -+int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount) -+{ -+ int err; -+ aufs_bindex_t bbot, add_bindex; -+ struct dentry *root, *h_dentry; -+ struct inode *root_inode; -+ struct au_branch *add_branch; -+ -+ root = sb->s_root; -+ root_inode = d_inode(root); -+ IMustLock(root_inode); -+ IiMustWriteLock(root_inode); -+ err = test_add(sb, add, remount); -+ if (unlikely(err < 0)) -+ goto out; -+ if (err) { -+ err = 0; -+ goto out; /* success */ -+ } -+ -+ bbot = au_sbbot(sb); -+ add_branch = au_br_alloc(sb, bbot + 2, add->perm); -+ err = PTR_ERR(add_branch); -+ if (IS_ERR(add_branch)) -+ goto out; -+ -+ err = au_br_init(add_branch, sb, add); -+ if (unlikely(err)) { -+ au_br_do_free(add_branch); -+ goto out; -+ } -+ -+ add_bindex = add->bindex; -+ sysaufs_brs_del(sb, add_bindex); /* remove successors */ -+ au_br_do_add(sb, add_branch, add_bindex); -+ sysaufs_brs_add(sb, add_bindex); /* append successors */ -+ dbgaufs_brs_add(sb, add_bindex, /*topdown*/0); /* rename successors */ -+ -+ h_dentry = add->path.dentry; -+ if (!add_bindex) { -+ au_cpup_attr_all(root_inode, /*force*/1); -+ sb->s_maxbytes = h_dentry->d_sb->s_maxbytes; -+ } else -+ au_add_nlink(root_inode, d_inode(h_dentry)); -+ -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static unsigned long long au_farray_cb(struct super_block *sb, void *a, -+ unsigned long long max __maybe_unused, -+ void *arg) -+{ -+ unsigned long long n; -+ struct file **p, *f; -+ struct hlist_bl_head *files; -+ struct hlist_bl_node *pos; -+ struct au_finfo *finfo; -+ -+ n = 0; -+ p = a; -+ files = &au_sbi(sb)->si_files; -+ hlist_bl_lock(files); -+ hlist_bl_for_each_entry(finfo, pos, files, fi_hlist) { -+ f = finfo->fi_file; -+ if (file_count(f) -+ && !special_file(file_inode(f)->i_mode)) { -+ get_file(f); -+ *p++ = f; -+ n++; -+ AuDebugOn(n > max); -+ } -+ } -+ hlist_bl_unlock(files); -+ -+ return n; -+} -+ -+static struct file **au_farray_alloc(struct super_block *sb, -+ unsigned long long *max) -+{ -+ struct au_sbinfo *sbi; -+ -+ sbi = au_sbi(sb); -+ *max = au_lcnt_read(&sbi->si_nfiles, /*do_rev*/1); -+ return au_array_alloc(max, au_farray_cb, sb, /*arg*/NULL); -+} -+ -+static void au_farray_free(struct file **a, unsigned long long max) -+{ -+ unsigned long long ull; -+ -+ for (ull = 0; ull < max; ull++) -+ if (a[ull]) -+ fput(a[ull]); -+ kvfree(a); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * delete a branch -+ */ -+ -+/* to show the line number, do not make it inlined function */ -+#define AuVerbose(do_info, fmt, ...) do { \ -+ if (do_info) \ -+ pr_info(fmt, ##__VA_ARGS__); \ -+} while (0) -+ -+static int au_test_ibusy(struct inode *inode, aufs_bindex_t btop, -+ aufs_bindex_t bbot) -+{ -+ return (inode && !S_ISDIR(inode->i_mode)) || btop == bbot; -+} -+ -+static int au_test_dbusy(struct dentry *dentry, aufs_bindex_t btop, -+ aufs_bindex_t bbot) -+{ -+ return au_test_ibusy(d_inode(dentry), btop, bbot); -+} -+ -+/* -+ * test if the branch is deletable or not. -+ */ -+static int test_dentry_busy(struct dentry *root, aufs_bindex_t bindex, -+ unsigned int sigen, const unsigned int verbose) -+{ -+ int err, i, j, ndentry; -+ aufs_bindex_t btop, bbot; -+ struct au_dcsub_pages dpages; -+ struct au_dpage *dpage; -+ struct dentry *d; -+ -+ err = au_dpages_init(&dpages, GFP_NOFS); -+ if (unlikely(err)) -+ goto out; -+ err = au_dcsub_pages(&dpages, root, NULL, NULL); -+ if (unlikely(err)) -+ goto out_dpages; -+ -+ for (i = 0; !err && i < dpages.ndpage; i++) { -+ dpage = dpages.dpages + i; -+ ndentry = dpage->ndentry; -+ for (j = 0; !err && j < ndentry; j++) { -+ d = dpage->dentries[j]; -+ AuDebugOn(au_dcount(d) <= 0); -+ if (!au_digen_test(d, sigen)) { -+ di_read_lock_child(d, AuLock_IR); -+ if (unlikely(au_dbrange_test(d))) { -+ di_read_unlock(d, AuLock_IR); -+ continue; -+ } -+ } else { -+ di_write_lock_child(d); -+ if (unlikely(au_dbrange_test(d))) { -+ di_write_unlock(d); -+ continue; -+ } -+ err = au_reval_dpath(d, sigen); -+ if (!err) -+ di_downgrade_lock(d, AuLock_IR); -+ else { -+ di_write_unlock(d); -+ break; -+ } -+ } -+ -+ /* AuDbgDentry(d); */ -+ btop = au_dbtop(d); -+ bbot = au_dbbot(d); -+ if (btop <= bindex -+ && bindex <= bbot -+ && au_h_dptr(d, bindex) -+ && au_test_dbusy(d, btop, bbot)) { -+ err = -EBUSY; -+ AuVerbose(verbose, "busy %pd\n", d); -+ AuDbgDentry(d); -+ } -+ di_read_unlock(d, AuLock_IR); -+ } -+ } -+ -+out_dpages: -+ au_dpages_free(&dpages); -+out: -+ return err; -+} -+ -+static int test_inode_busy(struct super_block *sb, aufs_bindex_t bindex, -+ unsigned int sigen, const unsigned int verbose) -+{ -+ int err; -+ unsigned long long max, ull; -+ struct inode *i, **array; -+ aufs_bindex_t btop, bbot; -+ -+ array = au_iarray_alloc(sb, &max); -+ err = PTR_ERR(array); -+ if (IS_ERR(array)) -+ goto out; -+ -+ err = 0; -+ AuDbg("b%d\n", bindex); -+ for (ull = 0; !err && ull < max; ull++) { -+ i = array[ull]; -+ if (unlikely(!i)) -+ break; -+ if (i->i_ino == AUFS_ROOT_INO) -+ continue; -+ -+ /* AuDbgInode(i); */ -+ if (au_iigen(i, NULL) == sigen) -+ ii_read_lock_child(i); -+ else { -+ ii_write_lock_child(i); -+ err = au_refresh_hinode_self(i); -+ au_iigen_dec(i); -+ if (!err) -+ ii_downgrade_lock(i); -+ else { -+ ii_write_unlock(i); -+ break; -+ } -+ } -+ -+ btop = au_ibtop(i); -+ bbot = au_ibbot(i); -+ if (btop <= bindex -+ && bindex <= bbot -+ && au_h_iptr(i, bindex) -+ && au_test_ibusy(i, btop, bbot)) { -+ err = -EBUSY; -+ AuVerbose(verbose, "busy i%lu\n", i->i_ino); -+ AuDbgInode(i); -+ } -+ ii_read_unlock(i); -+ } -+ au_iarray_free(array, max); -+ -+out: -+ return err; -+} -+ -+static int test_children_busy(struct dentry *root, aufs_bindex_t bindex, -+ const unsigned int verbose) -+{ -+ int err; -+ unsigned int sigen; -+ -+ sigen = au_sigen(root->d_sb); -+ DiMustNoWaiters(root); -+ IiMustNoWaiters(d_inode(root)); -+ di_write_unlock(root); -+ err = test_dentry_busy(root, bindex, sigen, verbose); -+ if (!err) -+ err = test_inode_busy(root->d_sb, bindex, sigen, verbose); -+ di_write_lock_child(root); /* aufs_write_lock() calls ..._child() */ -+ -+ return err; -+} -+ -+static int test_dir_busy(struct file *file, aufs_bindex_t br_id, -+ struct file **to_free, int *idx) -+{ -+ int err; -+ unsigned char matched, root; -+ aufs_bindex_t bindex, bbot; -+ struct au_fidir *fidir; -+ struct au_hfile *hfile; -+ -+ err = 0; -+ root = IS_ROOT(file->f_path.dentry); -+ if (root) { -+ get_file(file); -+ to_free[*idx] = file; -+ (*idx)++; -+ goto out; -+ } -+ -+ matched = 0; -+ fidir = au_fi(file)->fi_hdir; -+ AuDebugOn(!fidir); -+ bbot = au_fbbot_dir(file); -+ for (bindex = au_fbtop(file); bindex <= bbot; bindex++) { -+ hfile = fidir->fd_hfile + bindex; -+ if (!hfile->hf_file) -+ continue; -+ -+ if (hfile->hf_br->br_id == br_id) { -+ matched = 1; -+ break; -+ } -+ } -+ if (matched) -+ err = -EBUSY; -+ -+out: -+ return err; -+} -+ -+static int test_file_busy(struct super_block *sb, aufs_bindex_t br_id, -+ struct file **to_free, int opened) -+{ -+ int err, idx; -+ unsigned long long ull, max; -+ aufs_bindex_t btop; -+ struct file *file, **array; -+ struct dentry *root; -+ struct au_hfile *hfile; -+ -+ array = au_farray_alloc(sb, &max); -+ err = PTR_ERR(array); -+ if (IS_ERR(array)) -+ goto out; -+ -+ err = 0; -+ idx = 0; -+ root = sb->s_root; -+ di_write_unlock(root); -+ for (ull = 0; ull < max; ull++) { -+ file = array[ull]; -+ if (unlikely(!file)) -+ break; -+ -+ /* AuDbg("%pD\n", file); */ -+ fi_read_lock(file); -+ btop = au_fbtop(file); -+ if (!d_is_dir(file->f_path.dentry)) { -+ hfile = &au_fi(file)->fi_htop; -+ if (hfile->hf_br->br_id == br_id) -+ err = -EBUSY; -+ } else -+ err = test_dir_busy(file, br_id, to_free, &idx); -+ fi_read_unlock(file); -+ if (unlikely(err)) -+ break; -+ } -+ di_write_lock_child(root); -+ au_farray_free(array, max); -+ AuDebugOn(idx > opened); -+ -+out: -+ return err; -+} -+ -+static void br_del_file(struct file **to_free, unsigned long long opened, -+ aufs_bindex_t br_id) -+{ -+ unsigned long long ull; -+ aufs_bindex_t bindex, btop, bbot, bfound; -+ struct file *file; -+ struct au_fidir *fidir; -+ struct au_hfile *hfile; -+ -+ for (ull = 0; ull < opened; ull++) { -+ file = to_free[ull]; -+ if (unlikely(!file)) -+ break; -+ -+ /* AuDbg("%pD\n", file); */ -+ AuDebugOn(!d_is_dir(file->f_path.dentry)); -+ bfound = -1; -+ fidir = au_fi(file)->fi_hdir; -+ AuDebugOn(!fidir); -+ fi_write_lock(file); -+ btop = au_fbtop(file); -+ bbot = au_fbbot_dir(file); -+ for (bindex = btop; bindex <= bbot; bindex++) { -+ hfile = fidir->fd_hfile + bindex; -+ if (!hfile->hf_file) -+ continue; -+ -+ if (hfile->hf_br->br_id == br_id) { -+ bfound = bindex; -+ break; -+ } -+ } -+ AuDebugOn(bfound < 0); -+ au_set_h_fptr(file, bfound, NULL); -+ if (bfound == btop) { -+ for (btop++; btop <= bbot; btop++) -+ if (au_hf_dir(file, btop)) { -+ au_set_fbtop(file, btop); -+ break; -+ } -+ } -+ fi_write_unlock(file); -+ } -+} -+ -+static void au_br_do_del_brp(struct au_sbinfo *sbinfo, -+ const aufs_bindex_t bindex, -+ const aufs_bindex_t bbot) -+{ -+ struct au_branch **brp, **p; -+ -+ AuRwMustWriteLock(&sbinfo->si_rwsem); -+ -+ brp = sbinfo->si_branch + bindex; -+ if (bindex < bbot) -+ memmove(brp, brp + 1, sizeof(*brp) * (bbot - bindex)); -+ sbinfo->si_branch[0 + bbot] = NULL; -+ sbinfo->si_bbot--; -+ -+ p = au_krealloc(sbinfo->si_branch, sizeof(*p) * bbot, AuGFP_SBILIST, -+ /*may_shrink*/1); -+ if (p) -+ sbinfo->si_branch = p; -+ /* harmless error */ -+} -+ -+static void au_br_do_del_hdp(struct au_dinfo *dinfo, const aufs_bindex_t bindex, -+ const aufs_bindex_t bbot) -+{ -+ struct au_hdentry *hdp, *p; -+ -+ AuRwMustWriteLock(&dinfo->di_rwsem); -+ -+ hdp = au_hdentry(dinfo, bindex); -+ if (bindex < bbot) -+ memmove(hdp, hdp + 1, sizeof(*hdp) * (bbot - bindex)); -+ /* au_h_dentry_init(au_hdentry(dinfo, bbot); */ -+ dinfo->di_bbot--; -+ -+ p = au_krealloc(dinfo->di_hdentry, sizeof(*p) * bbot, AuGFP_SBILIST, -+ /*may_shrink*/1); -+ if (p) -+ dinfo->di_hdentry = p; -+ /* harmless error */ -+} -+ -+static void au_br_do_del_hip(struct au_iinfo *iinfo, const aufs_bindex_t bindex, -+ const aufs_bindex_t bbot) -+{ -+ struct au_hinode *hip, *p; -+ -+ AuRwMustWriteLock(&iinfo->ii_rwsem); -+ -+ hip = au_hinode(iinfo, bindex); -+ if (bindex < bbot) -+ memmove(hip, hip + 1, sizeof(*hip) * (bbot - bindex)); -+ /* au_hinode_init(au_hinode(iinfo, bbot)); */ -+ iinfo->ii_bbot--; -+ -+ p = au_krealloc(iinfo->ii_hinode, sizeof(*p) * bbot, AuGFP_SBILIST, -+ /*may_shrink*/1); -+ if (p) -+ iinfo->ii_hinode = p; -+ /* harmless error */ -+} -+ -+static void au_br_do_del(struct super_block *sb, aufs_bindex_t bindex, -+ struct au_branch *br) -+{ -+ aufs_bindex_t bbot; -+ struct au_sbinfo *sbinfo; -+ struct dentry *root, *h_root; -+ struct inode *inode, *h_inode; -+ struct au_hinode *hinode; -+ -+ SiMustWriteLock(sb); -+ -+ root = sb->s_root; -+ inode = d_inode(root); -+ sbinfo = au_sbi(sb); -+ bbot = sbinfo->si_bbot; -+ -+ h_root = au_h_dptr(root, bindex); -+ hinode = au_hi(inode, bindex); -+ h_inode = au_igrab(hinode->hi_inode); -+ au_hiput(hinode); -+ -+ au_sbilist_lock(); -+ au_br_do_del_brp(sbinfo, bindex, bbot); -+ au_br_do_del_hdp(au_di(root), bindex, bbot); -+ au_br_do_del_hip(au_ii(inode), bindex, bbot); -+ au_sbilist_unlock(); -+ -+ /* ignore an error */ -+ au_dr_br_fin(sb, br); /* always, regardless the mount option */ -+ -+ dput(h_root); -+ iput(h_inode); -+ au_br_do_free(br); -+} -+ -+static unsigned long long empty_cb(struct super_block *sb, void *array, -+ unsigned long long max, void *arg) -+{ -+ return max; -+} -+ -+int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount) -+{ -+ int err, rerr, i; -+ unsigned long long opened; -+ unsigned int mnt_flags; -+ aufs_bindex_t bindex, bbot, br_id; -+ unsigned char do_wh, verbose; -+ struct au_branch *br; -+ struct au_wbr *wbr; -+ struct dentry *root; -+ struct file **to_free; -+ -+ err = 0; -+ opened = 0; -+ to_free = NULL; -+ root = sb->s_root; -+ bindex = au_find_dbindex(root, del->h_path.dentry); -+ if (bindex < 0) { -+ if (remount) -+ goto out; /* success */ -+ err = -ENOENT; -+ pr_err("%s no such branch\n", del->pathname); -+ goto out; -+ } -+ AuDbg("bindex b%d\n", bindex); -+ -+ err = -EBUSY; -+ mnt_flags = au_mntflags(sb); -+ verbose = !!au_opt_test(mnt_flags, VERBOSE); -+ bbot = au_sbbot(sb); -+ if (unlikely(!bbot)) { -+ AuVerbose(verbose, "no more branches left\n"); -+ goto out; -+ } -+ -+ br = au_sbr(sb, bindex); -+ AuDebugOn(!path_equal(&br->br_path, &del->h_path)); -+ if (unlikely(au_lcnt_read(&br->br_count, /*do_rev*/1))) { -+ AuVerbose(verbose, "br %pd2 is busy now\n", del->h_path.dentry); -+ goto out; -+ } -+ -+ br_id = br->br_id; -+ opened = au_lcnt_read(&br->br_nfiles, /*do_rev*/1); -+ if (unlikely(opened)) { -+ to_free = au_array_alloc(&opened, empty_cb, sb, NULL); -+ err = PTR_ERR(to_free); -+ if (IS_ERR(to_free)) -+ goto out; -+ -+ err = test_file_busy(sb, br_id, to_free, opened); -+ if (unlikely(err)) { -+ AuVerbose(verbose, "%llu file(s) opened\n", opened); -+ goto out; -+ } -+ } -+ -+ wbr = br->br_wbr; -+ do_wh = wbr && (wbr->wbr_whbase || wbr->wbr_plink || wbr->wbr_orph); -+ if (do_wh) { -+ /* instead of WbrWhMustWriteLock(wbr) */ -+ SiMustWriteLock(sb); -+ for (i = 0; i < AuBrWh_Last; i++) { -+ dput(wbr->wbr_wh[i]); -+ wbr->wbr_wh[i] = NULL; -+ } -+ } -+ -+ err = test_children_busy(root, bindex, verbose); -+ if (unlikely(err)) { -+ if (do_wh) -+ goto out_wh; -+ goto out; -+ } -+ -+ err = 0; -+ if (to_free) { -+ /* -+ * now we confirmed the branch is deletable. -+ * let's free the remaining opened dirs on the branch. -+ */ -+ di_write_unlock(root); -+ br_del_file(to_free, opened, br_id); -+ di_write_lock_child(root); -+ } -+ -+ sysaufs_brs_del(sb, bindex); /* remove successors */ -+ dbgaufs_xino_del(br); /* remove one */ -+ au_br_do_del(sb, bindex, br); -+ sysaufs_brs_add(sb, bindex); /* append successors */ -+ dbgaufs_brs_add(sb, bindex, /*topdown*/1); /* rename successors */ -+ -+ if (!bindex) { -+ au_cpup_attr_all(d_inode(root), /*force*/1); -+ sb->s_maxbytes = au_sbr_sb(sb, 0)->s_maxbytes; -+ } else -+ au_sub_nlink(d_inode(root), d_inode(del->h_path.dentry)); -+ if (au_opt_test(mnt_flags, PLINK)) -+ au_plink_half_refresh(sb, br_id); -+ -+ goto out; /* success */ -+ -+out_wh: -+ /* revert */ -+ rerr = au_br_init_wh(sb, br, br->br_perm); -+ if (rerr) -+ pr_warn("failed re-creating base whiteout, %s. (%d)\n", -+ del->pathname, rerr); -+out: -+ if (to_free) -+ au_farray_free(to_free, opened); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_ibusy(struct super_block *sb, struct aufs_ibusy __user *arg) -+{ -+ int err; -+ aufs_bindex_t btop, bbot; -+ struct aufs_ibusy ibusy; -+ struct inode *inode, *h_inode; -+ -+ err = -EPERM; -+ if (unlikely(!capable(CAP_SYS_ADMIN))) -+ goto out; -+ -+ err = copy_from_user(&ibusy, arg, sizeof(ibusy)); -+ if (!err) -+ /* VERIFY_WRITE */ -+ err = !access_ok(&arg->h_ino, sizeof(arg->h_ino)); -+ if (unlikely(err)) { -+ err = -EFAULT; -+ AuTraceErr(err); -+ goto out; -+ } -+ -+ err = -EINVAL; -+ si_read_lock(sb, AuLock_FLUSH); -+ if (unlikely(ibusy.bindex < 0 || ibusy.bindex > au_sbbot(sb))) -+ goto out_unlock; -+ -+ err = 0; -+ ibusy.h_ino = 0; /* invalid */ -+ inode = ilookup(sb, ibusy.ino); -+ if (!inode -+ || inode->i_ino == AUFS_ROOT_INO -+ || au_is_bad_inode(inode)) -+ goto out_unlock; -+ -+ ii_read_lock_child(inode); -+ btop = au_ibtop(inode); -+ bbot = au_ibbot(inode); -+ if (btop <= ibusy.bindex && ibusy.bindex <= bbot) { -+ h_inode = au_h_iptr(inode, ibusy.bindex); -+ if (h_inode && au_test_ibusy(inode, btop, bbot)) -+ ibusy.h_ino = h_inode->i_ino; -+ } -+ ii_read_unlock(inode); -+ iput(inode); -+ -+out_unlock: -+ si_read_unlock(sb); -+ if (!err) { -+ err = __put_user(ibusy.h_ino, &arg->h_ino); -+ if (unlikely(err)) { -+ err = -EFAULT; -+ AuTraceErr(err); -+ } -+ } -+out: -+ return err; -+} -+ -+long au_ibusy_ioctl(struct file *file, unsigned long arg) -+{ -+ return au_ibusy(file->f_path.dentry->d_sb, (void __user *)arg); -+} -+ -+#ifdef CONFIG_COMPAT -+long au_ibusy_compat_ioctl(struct file *file, unsigned long arg) -+{ -+ return au_ibusy(file->f_path.dentry->d_sb, compat_ptr(arg)); -+} -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * change a branch permission -+ */ -+ -+static void au_warn_ima(void) -+{ -+#ifdef CONFIG_IMA -+ /* since it doesn't support mark_files_ro() */ -+ AuWarn1("RW -> RO makes IMA to produce wrong message\n"); -+#endif -+} -+ -+static int do_need_sigen_inc(int a, int b) -+{ -+ return au_br_whable(a) && !au_br_whable(b); -+} -+ -+static int need_sigen_inc(int old, int new) -+{ -+ return do_need_sigen_inc(old, new) -+ || do_need_sigen_inc(new, old); -+} -+ -+static int au_br_mod_files_ro(struct super_block *sb, aufs_bindex_t bindex) -+{ -+ int err, do_warn; -+ unsigned int mnt_flags; -+ unsigned long long ull, max; -+ aufs_bindex_t br_id; -+ unsigned char verbose, writer; -+ struct file *file, *hf, **array; -+ struct au_hfile *hfile; -+ -+ mnt_flags = au_mntflags(sb); -+ verbose = !!au_opt_test(mnt_flags, VERBOSE); -+ -+ array = au_farray_alloc(sb, &max); -+ err = PTR_ERR(array); -+ if (IS_ERR(array)) -+ goto out; -+ -+ do_warn = 0; -+ br_id = au_sbr_id(sb, bindex); -+ for (ull = 0; ull < max; ull++) { -+ file = array[ull]; -+ if (unlikely(!file)) -+ break; -+ -+ /* AuDbg("%pD\n", file); */ -+ fi_read_lock(file); -+ if (unlikely(au_test_mmapped(file))) { -+ err = -EBUSY; -+ AuVerbose(verbose, "mmapped %pD\n", file); -+ AuDbgFile(file); -+ FiMustNoWaiters(file); -+ fi_read_unlock(file); -+ goto out_array; -+ } -+ -+ hfile = &au_fi(file)->fi_htop; -+ hf = hfile->hf_file; -+ if (!d_is_reg(file->f_path.dentry) -+ || !(file->f_mode & FMODE_WRITE) -+ || hfile->hf_br->br_id != br_id -+ || !(hf->f_mode & FMODE_WRITE)) -+ array[ull] = NULL; -+ else { -+ do_warn = 1; -+ get_file(file); -+ } -+ -+ FiMustNoWaiters(file); -+ fi_read_unlock(file); -+ fput(file); -+ } -+ -+ err = 0; -+ if (do_warn) -+ au_warn_ima(); -+ -+ for (ull = 0; ull < max; ull++) { -+ file = array[ull]; -+ if (!file) -+ continue; -+ -+ /* todo: already flushed? */ -+ /* -+ * fs/super.c:mark_files_ro() is gone, but aufs keeps its -+ * approach which resets f_mode and calls mnt_drop_write() and -+ * file_release_write() for each file, because the branch -+ * attribute in aufs world is totally different from the native -+ * fs rw/ro mode. -+ */ -+ /* fi_read_lock(file); */ -+ hfile = &au_fi(file)->fi_htop; -+ hf = hfile->hf_file; -+ /* fi_read_unlock(file); */ -+ spin_lock(&hf->f_lock); -+ writer = !!(hf->f_mode & FMODE_WRITER); -+ hf->f_mode &= ~(FMODE_WRITE | FMODE_WRITER); -+ spin_unlock(&hf->f_lock); -+ if (writer) { -+ put_write_access(file_inode(hf)); -+ __mnt_drop_write(hf->f_path.mnt); -+ } -+ } -+ -+out_array: -+ au_farray_free(array, max); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount, -+ int *do_refresh) -+{ -+ int err, rerr; -+ aufs_bindex_t bindex; -+ struct dentry *root; -+ struct au_branch *br; -+ struct au_br_fhsm *bf; -+ -+ root = sb->s_root; -+ bindex = au_find_dbindex(root, mod->h_root); -+ if (bindex < 0) { -+ if (remount) -+ return 0; /* success */ -+ err = -ENOENT; -+ pr_err("%s no such branch\n", mod->path); -+ goto out; -+ } -+ AuDbg("bindex b%d\n", bindex); -+ -+ err = test_br(d_inode(mod->h_root), mod->perm, mod->path); -+ if (unlikely(err)) -+ goto out; -+ -+ br = au_sbr(sb, bindex); -+ AuDebugOn(mod->h_root != au_br_dentry(br)); -+ if (br->br_perm == mod->perm) -+ return 0; /* success */ -+ -+ /* pre-allocate for non-fhsm --> fhsm */ -+ bf = NULL; -+ if (!au_br_fhsm(br->br_perm) && au_br_fhsm(mod->perm)) { -+ err = au_fhsm_br_alloc(br); -+ if (unlikely(err)) -+ goto out; -+ bf = br->br_fhsm; -+ br->br_fhsm = NULL; -+ } -+ -+ if (au_br_writable(br->br_perm)) { -+ /* remove whiteout base */ -+ err = au_br_init_wh(sb, br, mod->perm); -+ if (unlikely(err)) -+ goto out_bf; -+ -+ if (!au_br_writable(mod->perm)) { -+ /* rw --> ro, file might be mmapped */ -+ DiMustNoWaiters(root); -+ IiMustNoWaiters(d_inode(root)); -+ di_write_unlock(root); -+ err = au_br_mod_files_ro(sb, bindex); -+ /* aufs_write_lock() calls ..._child() */ -+ di_write_lock_child(root); -+ -+ if (unlikely(err)) { -+ rerr = -ENOMEM; -+ br->br_wbr = kzalloc(sizeof(*br->br_wbr), -+ GFP_NOFS); -+ if (br->br_wbr) -+ rerr = au_wbr_init(br, sb, br->br_perm); -+ if (unlikely(rerr)) { -+ AuIOErr("nested error %d (%d)\n", -+ rerr, err); -+ br->br_perm = mod->perm; -+ } -+ } -+ } -+ } else if (au_br_writable(mod->perm)) { -+ /* ro --> rw */ -+ err = -ENOMEM; -+ br->br_wbr = kzalloc(sizeof(*br->br_wbr), GFP_NOFS); -+ if (br->br_wbr) { -+ err = au_wbr_init(br, sb, mod->perm); -+ if (unlikely(err)) { -+ au_kfree_rcu(br->br_wbr); -+ br->br_wbr = NULL; -+ } -+ } -+ } -+ if (unlikely(err)) -+ goto out_bf; -+ -+ if (au_br_fhsm(br->br_perm)) { -+ if (!au_br_fhsm(mod->perm)) { -+ /* fhsm --> non-fhsm */ -+ au_br_fhsm_fin(br->br_fhsm); -+ au_kfree_rcu(br->br_fhsm); -+ br->br_fhsm = NULL; -+ } -+ } else if (au_br_fhsm(mod->perm)) -+ /* non-fhsm --> fhsm */ -+ br->br_fhsm = bf; -+ -+ *do_refresh |= need_sigen_inc(br->br_perm, mod->perm); -+ br->br_perm = mod->perm; -+ goto out; /* success */ -+ -+out_bf: -+ au_kfree_try_rcu(bf); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int au_br_stfs(struct au_branch *br, struct aufs_stfs *stfs) -+{ -+ int err; -+ struct kstatfs kstfs; -+ -+ err = vfs_statfs(&br->br_path, &kstfs); -+ if (!err) { -+ stfs->f_blocks = kstfs.f_blocks; -+ stfs->f_bavail = kstfs.f_bavail; -+ stfs->f_files = kstfs.f_files; -+ stfs->f_ffree = kstfs.f_ffree; -+ } -+ -+ return err; -+} -diff --git a/fs/aufs/branch.h b/fs/aufs/branch.h -new file mode 100644 -index 000000000000..012459ad57f3 ---- /dev/null -+++ b/fs/aufs/branch.h -@@ -0,0 +1,366 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * branch filesystems and xino for them -+ */ -+ -+#ifndef __AUFS_BRANCH_H__ -+#define __AUFS_BRANCH_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/mount.h> -+#include "dirren.h" -+#include "dynop.h" -+#include "lcnt.h" -+#include "rwsem.h" -+#include "super.h" -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* a xino file */ -+struct au_xino { -+ struct file **xi_file; -+ unsigned int xi_nfile; -+ -+ struct { -+ spinlock_t spin; -+ ino_t *array; -+ int total; -+ /* reserved for future use */ -+ /* unsigned long *bitmap; */ -+ wait_queue_head_t wqh; -+ } xi_nondir; -+ -+ struct mutex xi_mtx; /* protects xi_file array */ -+ struct hlist_bl_head xi_writing; -+ -+ atomic_t xi_truncating; -+ -+ struct kref xi_kref; -+}; -+ -+/* File-based Hierarchical Storage Management */ -+struct au_br_fhsm { -+#ifdef CONFIG_AUFS_FHSM -+ struct mutex bf_lock; -+ unsigned long bf_jiffy; -+ struct aufs_stfs bf_stfs; -+ int bf_readable; -+#endif -+}; -+ -+/* members for writable branch only */ -+enum {AuBrWh_BASE, AuBrWh_PLINK, AuBrWh_ORPH, AuBrWh_Last}; -+struct au_wbr { -+ struct au_rwsem wbr_wh_rwsem; -+ struct dentry *wbr_wh[AuBrWh_Last]; -+ atomic_t wbr_wh_running; -+#define wbr_whbase wbr_wh[AuBrWh_BASE] /* whiteout base */ -+#define wbr_plink wbr_wh[AuBrWh_PLINK] /* pseudo-link dir */ -+#define wbr_orph wbr_wh[AuBrWh_ORPH] /* dir for orphans */ -+ -+ /* mfs mode */ -+ unsigned long long wbr_bytes; -+}; -+ -+/* ext2 has 3 types of operations at least, ext3 has 4 */ -+#define AuBrDynOp (AuDyLast * 4) -+ -+#ifdef CONFIG_AUFS_HFSNOTIFY -+/* support for asynchronous destruction */ -+struct au_br_hfsnotify { -+ struct fsnotify_group *hfsn_group; -+}; -+#endif -+ -+/* sysfs entries */ -+struct au_brsysfs { -+ char name[16]; -+ struct attribute attr; -+}; -+ -+enum { -+ AuBrSysfs_BR, -+ AuBrSysfs_BRID, -+ AuBrSysfs_Last -+}; -+ -+/* protected by superblock rwsem */ -+struct au_branch { -+ struct au_xino *br_xino; -+ -+ aufs_bindex_t br_id; -+ -+ int br_perm; -+ struct path br_path; -+ spinlock_t br_dykey_lock; -+ struct au_dykey *br_dykey[AuBrDynOp]; -+ au_lcnt_t br_nfiles; /* opened files */ -+ au_lcnt_t br_count; /* in-use for other */ -+ -+ struct au_wbr *br_wbr; -+ struct au_br_fhsm *br_fhsm; -+ -+#ifdef CONFIG_AUFS_HFSNOTIFY -+ struct au_br_hfsnotify *br_hfsn; -+#endif -+ -+#ifdef CONFIG_SYSFS -+ /* entries under sysfs per mount-point */ -+ struct au_brsysfs br_sysfs[AuBrSysfs_Last]; -+#endif -+ -+#ifdef CONFIG_DEBUG_FS -+ struct dentry *br_dbgaufs; /* xino */ -+#endif -+ -+ struct au_dr_br br_dirren; -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline struct vfsmount *au_br_mnt(struct au_branch *br) -+{ -+ return br->br_path.mnt; -+} -+ -+static inline struct dentry *au_br_dentry(struct au_branch *br) -+{ -+ return br->br_path.dentry; -+} -+ -+static inline struct super_block *au_br_sb(struct au_branch *br) -+{ -+ return au_br_mnt(br)->mnt_sb; -+} -+ -+static inline int au_br_rdonly(struct au_branch *br) -+{ -+ return (sb_rdonly(au_br_sb(br)) -+ || !au_br_writable(br->br_perm)) -+ ? -EROFS : 0; -+} -+ -+static inline int au_br_hnotifyable(int brperm __maybe_unused) -+{ -+#ifdef CONFIG_AUFS_HNOTIFY -+ return !(brperm & AuBrPerm_RR); -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_br_test_oflag(int oflag, struct au_branch *br) -+{ -+ int err, exec_flag; -+ -+ err = 0; -+ exec_flag = oflag & __FMODE_EXEC; -+ if (unlikely(exec_flag && path_noexec(&br->br_path))) -+ err = -EACCES; -+ -+ return err; -+} -+ -+static inline void au_xino_get(struct au_branch *br) -+{ -+ struct au_xino *xi; -+ -+ xi = br->br_xino; -+ if (xi) -+ kref_get(&xi->xi_kref); -+} -+ -+static inline int au_xino_count(struct au_branch *br) -+{ -+ int v; -+ struct au_xino *xi; -+ -+ v = 0; -+ xi = br->br_xino; -+ if (xi) -+ v = kref_read(&xi->xi_kref); -+ -+ return v; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* branch.c */ -+struct au_sbinfo; -+void au_br_free(struct au_sbinfo *sinfo); -+int au_br_index(struct super_block *sb, aufs_bindex_t br_id); -+struct au_opt_add; -+int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount); -+struct au_opt_del; -+int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount); -+long au_ibusy_ioctl(struct file *file, unsigned long arg); -+#ifdef CONFIG_COMPAT -+long au_ibusy_compat_ioctl(struct file *file, unsigned long arg); -+#endif -+struct au_opt_mod; -+int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount, -+ int *do_refresh); -+struct aufs_stfs; -+int au_br_stfs(struct au_branch *br, struct aufs_stfs *stfs); -+ -+/* xino.c */ -+static const loff_t au_loff_max = LLONG_MAX; -+ -+aufs_bindex_t au_xi_root(struct super_block *sb, struct dentry *dentry); -+struct file *au_xino_create(struct super_block *sb, char *fpath, int silent, -+ int wbrtop); -+struct file *au_xino_create2(struct super_block *sb, struct path *base, -+ struct file *copy_src); -+struct au_xi_new { -+ struct au_xino *xi; /* switch between xino and xigen */ -+ int idx; -+ struct path *base; -+ struct file *copy_src; -+}; -+struct file *au_xi_new(struct super_block *sb, struct au_xi_new *xinew); -+ -+int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, -+ ino_t *ino); -+int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, -+ ino_t ino); -+ssize_t xino_fread(vfs_readf_t func, struct file *file, void *buf, size_t size, -+ loff_t *pos); -+ssize_t xino_fwrite(vfs_writef_t func, struct file *file, void *buf, -+ size_t size, loff_t *pos); -+ -+int au_xib_trunc(struct super_block *sb); -+int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex, int idx_begin); -+ -+struct au_xino *au_xino_alloc(unsigned int nfile); -+int au_xino_put(struct au_branch *br); -+struct file *au_xino_file1(struct au_xino *xi); -+ -+struct au_opt_xino; -+void au_xino_clr(struct super_block *sb); -+int au_xino_set(struct super_block *sb, struct au_opt_xino *xiopt, int remount); -+struct file *au_xino_def(struct super_block *sb); -+int au_xino_init_br(struct super_block *sb, struct au_branch *br, ino_t hino, -+ struct path *base); -+ -+ino_t au_xino_new_ino(struct super_block *sb); -+void au_xino_delete_inode(struct inode *inode, const int unlinked); -+ -+void au_xinondir_leave(struct super_block *sb, aufs_bindex_t bindex, -+ ino_t h_ino, int idx); -+int au_xinondir_enter(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, -+ int *idx); -+ -+int au_xino_path(struct seq_file *seq, struct file *file); -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* @idx is signed to accept -1 meaning the first file */ -+static inline struct file *au_xino_file(struct au_xino *xi, int idx) -+{ -+ struct file *file; -+ -+ file = NULL; -+ if (!xi) -+ goto out; -+ -+ if (idx >= 0) { -+ if (idx < xi->xi_nfile) -+ file = xi->xi_file[idx]; -+ } else -+ file = au_xino_file1(xi); -+ -+out: -+ return file; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* Superblock to branch */ -+static inline -+aufs_bindex_t au_sbr_id(struct super_block *sb, aufs_bindex_t bindex) -+{ -+ return au_sbr(sb, bindex)->br_id; -+} -+ -+static inline -+struct vfsmount *au_sbr_mnt(struct super_block *sb, aufs_bindex_t bindex) -+{ -+ return au_br_mnt(au_sbr(sb, bindex)); -+} -+ -+static inline -+struct super_block *au_sbr_sb(struct super_block *sb, aufs_bindex_t bindex) -+{ -+ return au_br_sb(au_sbr(sb, bindex)); -+} -+ -+static inline int au_sbr_perm(struct super_block *sb, aufs_bindex_t bindex) -+{ -+ return au_sbr(sb, bindex)->br_perm; -+} -+ -+static inline int au_sbr_whable(struct super_block *sb, aufs_bindex_t bindex) -+{ -+ return au_br_whable(au_sbr_perm(sb, bindex)); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+#define wbr_wh_read_lock(wbr) au_rw_read_lock(&(wbr)->wbr_wh_rwsem) -+#define wbr_wh_write_lock(wbr) au_rw_write_lock(&(wbr)->wbr_wh_rwsem) -+#define wbr_wh_read_trylock(wbr) au_rw_read_trylock(&(wbr)->wbr_wh_rwsem) -+#define wbr_wh_write_trylock(wbr) au_rw_write_trylock(&(wbr)->wbr_wh_rwsem) -+/* -+#define wbr_wh_read_trylock_nested(wbr) \ -+ au_rw_read_trylock_nested(&(wbr)->wbr_wh_rwsem) -+#define wbr_wh_write_trylock_nested(wbr) \ -+ au_rw_write_trylock_nested(&(wbr)->wbr_wh_rwsem) -+*/ -+ -+#define wbr_wh_read_unlock(wbr) au_rw_read_unlock(&(wbr)->wbr_wh_rwsem) -+#define wbr_wh_write_unlock(wbr) au_rw_write_unlock(&(wbr)->wbr_wh_rwsem) -+#define wbr_wh_downgrade_lock(wbr) au_rw_dgrade_lock(&(wbr)->wbr_wh_rwsem) -+ -+#define WbrWhMustNoWaiters(wbr) AuRwMustNoWaiters(&(wbr)->wbr_wh_rwsem) -+#define WbrWhMustAnyLock(wbr) AuRwMustAnyLock(&(wbr)->wbr_wh_rwsem) -+#define WbrWhMustWriteLock(wbr) AuRwMustWriteLock(&(wbr)->wbr_wh_rwsem) -+ -+/* ---------------------------------------------------------------------- */ -+ -+#ifdef CONFIG_AUFS_FHSM -+static inline void au_br_fhsm_init(struct au_br_fhsm *brfhsm) -+{ -+ mutex_init(&brfhsm->bf_lock); -+ brfhsm->bf_jiffy = 0; -+ brfhsm->bf_readable = 0; -+} -+ -+static inline void au_br_fhsm_fin(struct au_br_fhsm *brfhsm) -+{ -+ mutex_destroy(&brfhsm->bf_lock); -+} -+#else -+AuStubVoid(au_br_fhsm_init, struct au_br_fhsm *brfhsm) -+AuStubVoid(au_br_fhsm_fin, struct au_br_fhsm *brfhsm) -+#endif -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_BRANCH_H__ */ -diff --git a/fs/aufs/conf.mk b/fs/aufs/conf.mk -new file mode 100644 -index 000000000000..12782f8e0f38 ---- /dev/null -+++ b/fs/aufs/conf.mk -@@ -0,0 +1,40 @@ -+# SPDX-License-Identifier: GPL-2.0 -+ -+AuConfStr = CONFIG_AUFS_FS=${CONFIG_AUFS_FS} -+ -+define AuConf -+ifdef ${1} -+AuConfStr += ${1}=${${1}} -+endif -+endef -+ -+AuConfAll = BRANCH_MAX_127 BRANCH_MAX_511 BRANCH_MAX_1023 BRANCH_MAX_32767 \ -+ SBILIST \ -+ HNOTIFY HFSNOTIFY \ -+ EXPORT INO_T_64 \ -+ XATTR \ -+ FHSM \ -+ RDU \ -+ DIRREN \ -+ SHWH \ -+ BR_RAMFS \ -+ BR_FUSE POLL \ -+ BR_HFSPLUS \ -+ BDEV_LOOP \ -+ DEBUG MAGIC_SYSRQ -+$(foreach i, ${AuConfAll}, \ -+ $(eval $(call AuConf,CONFIG_AUFS_${i}))) -+ -+AuConfName = ${obj}/conf.str -+${AuConfName}.tmp: FORCE -+ @echo ${AuConfStr} | tr ' ' '\n' | sed -e 's/^/"/' -e 's/$$/\\n"/' > $@ -+${AuConfName}: ${AuConfName}.tmp -+ @diff -q $< $@ > /dev/null 2>&1 || { \ -+ echo ' GEN ' $@; \ -+ cp -p $< $@; \ -+ } -+FORCE: -+clean-files += ${AuConfName} ${AuConfName}.tmp -+${obj}/sysfs.o: ${AuConfName} -+ -+-include ${srctree}/${src}/conf_priv.mk -diff --git a/fs/aufs/cpup.c b/fs/aufs/cpup.c -new file mode 100644 -index 000000000000..21134b448967 ---- /dev/null -+++ b/fs/aufs/cpup.c -@@ -0,0 +1,1458 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * copy-up functions, see wbr_policy.c for copy-down -+ */ -+ -+#include <linux/fs_stack.h> -+#include <linux/mm.h> -+#include <linux/task_work.h> -+#include "aufs.h" -+ -+void au_cpup_attr_flags(struct inode *dst, unsigned int iflags) -+{ -+ const unsigned int mask = S_DEAD | S_SWAPFILE | S_PRIVATE -+ | S_NOATIME | S_NOCMTIME | S_AUTOMOUNT; -+ -+ BUILD_BUG_ON(sizeof(iflags) != sizeof(dst->i_flags)); -+ -+ dst->i_flags |= iflags & ~mask; -+ if (au_test_fs_notime(dst->i_sb)) -+ dst->i_flags |= S_NOATIME | S_NOCMTIME; -+} -+ -+void au_cpup_attr_timesizes(struct inode *inode) -+{ -+ struct inode *h_inode; -+ -+ h_inode = au_h_iptr(inode, au_ibtop(inode)); -+ fsstack_copy_attr_times(inode, h_inode); -+ fsstack_copy_inode_size(inode, h_inode); -+} -+ -+void au_cpup_attr_nlink(struct inode *inode, int force) -+{ -+ struct inode *h_inode; -+ struct super_block *sb; -+ aufs_bindex_t bindex, bbot; -+ -+ sb = inode->i_sb; -+ bindex = au_ibtop(inode); -+ h_inode = au_h_iptr(inode, bindex); -+ if (!force -+ && !S_ISDIR(h_inode->i_mode) -+ && au_opt_test(au_mntflags(sb), PLINK) -+ && au_plink_test(inode)) -+ return; -+ -+ /* -+ * 0 can happen in revalidating. -+ * h_inode->i_mutex may not be held here, but it is harmless since once -+ * i_nlink reaches 0, it will never become positive except O_TMPFILE -+ * case. -+ * todo: O_TMPFILE+linkat(AT_SYMLINK_FOLLOW) bypassing aufs may cause -+ * the incorrect link count. -+ */ -+ set_nlink(inode, h_inode->i_nlink); -+ -+ /* -+ * fewer nlink makes find(1) noisy, but larger nlink doesn't. -+ * it may includes whplink directory. -+ */ -+ if (S_ISDIR(h_inode->i_mode)) { -+ bbot = au_ibbot(inode); -+ for (bindex++; bindex <= bbot; bindex++) { -+ h_inode = au_h_iptr(inode, bindex); -+ if (h_inode) -+ au_add_nlink(inode, h_inode); -+ } -+ } -+} -+ -+void au_cpup_attr_changeable(struct inode *inode) -+{ -+ struct inode *h_inode; -+ -+ h_inode = au_h_iptr(inode, au_ibtop(inode)); -+ inode->i_mode = h_inode->i_mode; -+ inode->i_uid = h_inode->i_uid; -+ inode->i_gid = h_inode->i_gid; -+ au_cpup_attr_timesizes(inode); -+ au_cpup_attr_flags(inode, h_inode->i_flags); -+} -+ -+void au_cpup_igen(struct inode *inode, struct inode *h_inode) -+{ -+ struct au_iinfo *iinfo = au_ii(inode); -+ -+ IiMustWriteLock(inode); -+ -+ iinfo->ii_higen = h_inode->i_generation; -+ iinfo->ii_hsb1 = h_inode->i_sb; -+} -+ -+void au_cpup_attr_all(struct inode *inode, int force) -+{ -+ struct inode *h_inode; -+ -+ h_inode = au_h_iptr(inode, au_ibtop(inode)); -+ au_cpup_attr_changeable(inode); -+ if (inode->i_nlink > 0) -+ au_cpup_attr_nlink(inode, force); -+ inode->i_rdev = h_inode->i_rdev; -+ inode->i_blkbits = h_inode->i_blkbits; -+ au_cpup_igen(inode, h_inode); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* Note: dt_dentry and dt_h_dentry are not dget/dput-ed */ -+ -+/* keep the timestamps of the parent dir when cpup */ -+void au_dtime_store(struct au_dtime *dt, struct dentry *dentry, -+ struct path *h_path) -+{ -+ struct inode *h_inode; -+ -+ dt->dt_dentry = dentry; -+ dt->dt_h_path = *h_path; -+ h_inode = d_inode(h_path->dentry); -+ dt->dt_atime = h_inode->i_atime; -+ dt->dt_mtime = h_inode->i_mtime; -+ /* smp_mb(); */ -+} -+ -+void au_dtime_revert(struct au_dtime *dt) -+{ -+ struct iattr attr; -+ int err; -+ -+ attr.ia_atime = dt->dt_atime; -+ attr.ia_mtime = dt->dt_mtime; -+ attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET -+ | ATTR_ATIME | ATTR_ATIME_SET; -+ -+ /* no delegation since this is a directory */ -+ err = vfsub_notify_change(&dt->dt_h_path, &attr, /*delegated*/NULL); -+ if (unlikely(err)) -+ pr_warn("restoring timestamps failed(%d). ignored\n", err); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* internal use only */ -+struct au_cpup_reg_attr { -+ int valid; -+ struct kstat st; -+ unsigned int iflags; /* inode->i_flags */ -+}; -+ -+static noinline_for_stack -+int cpup_iattr(struct dentry *dst, aufs_bindex_t bindex, struct dentry *h_src, -+ struct au_cpup_reg_attr *h_src_attr) -+{ -+ int err, sbits, icex; -+ unsigned int mnt_flags; -+ unsigned char verbose; -+ struct iattr ia; -+ struct path h_path; -+ struct inode *h_isrc, *h_idst; -+ struct kstat *h_st; -+ struct au_branch *br; -+ -+ h_path.dentry = au_h_dptr(dst, bindex); -+ h_idst = d_inode(h_path.dentry); -+ br = au_sbr(dst->d_sb, bindex); -+ h_path.mnt = au_br_mnt(br); -+ h_isrc = d_inode(h_src); -+ ia.ia_valid = ATTR_FORCE | ATTR_UID | ATTR_GID -+ | ATTR_ATIME | ATTR_MTIME -+ | ATTR_ATIME_SET | ATTR_MTIME_SET; -+ if (h_src_attr && h_src_attr->valid) { -+ h_st = &h_src_attr->st; -+ ia.ia_uid = h_st->uid; -+ ia.ia_gid = h_st->gid; -+ ia.ia_atime = h_st->atime; -+ ia.ia_mtime = h_st->mtime; -+ if (h_idst->i_mode != h_st->mode -+ && !S_ISLNK(h_idst->i_mode)) { -+ ia.ia_valid |= ATTR_MODE; -+ ia.ia_mode = h_st->mode; -+ } -+ sbits = !!(h_st->mode & (S_ISUID | S_ISGID)); -+ au_cpup_attr_flags(h_idst, h_src_attr->iflags); -+ } else { -+ ia.ia_uid = h_isrc->i_uid; -+ ia.ia_gid = h_isrc->i_gid; -+ ia.ia_atime = h_isrc->i_atime; -+ ia.ia_mtime = h_isrc->i_mtime; -+ if (h_idst->i_mode != h_isrc->i_mode -+ && !S_ISLNK(h_idst->i_mode)) { -+ ia.ia_valid |= ATTR_MODE; -+ ia.ia_mode = h_isrc->i_mode; -+ } -+ sbits = !!(h_isrc->i_mode & (S_ISUID | S_ISGID)); -+ au_cpup_attr_flags(h_idst, h_isrc->i_flags); -+ } -+ /* no delegation since it is just created */ -+ err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL); -+ -+ /* is this nfs only? */ -+ if (!err && sbits && au_test_nfs(h_path.dentry->d_sb)) { -+ ia.ia_valid = ATTR_FORCE | ATTR_MODE; -+ ia.ia_mode = h_isrc->i_mode; -+ err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL); -+ } -+ -+ icex = br->br_perm & AuBrAttr_ICEX; -+ if (!err) { -+ mnt_flags = au_mntflags(dst->d_sb); -+ verbose = !!au_opt_test(mnt_flags, VERBOSE); -+ err = au_cpup_xattr(h_path.dentry, h_src, icex, verbose); -+ } -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_do_copy_file(struct file *dst, struct file *src, loff_t len, -+ char *buf, unsigned long blksize) -+{ -+ int err; -+ size_t sz, rbytes, wbytes; -+ unsigned char all_zero; -+ char *p, *zp; -+ struct inode *h_inode; -+ /* reduce stack usage */ -+ struct iattr *ia; -+ -+ zp = page_address(ZERO_PAGE(0)); -+ if (unlikely(!zp)) -+ return -ENOMEM; /* possible? */ -+ -+ err = 0; -+ all_zero = 0; -+ while (len) { -+ AuDbg("len %lld\n", len); -+ sz = blksize; -+ if (len < blksize) -+ sz = len; -+ -+ rbytes = 0; -+ /* todo: signal_pending? */ -+ while (!rbytes || err == -EAGAIN || err == -EINTR) { -+ rbytes = vfsub_read_k(src, buf, sz, &src->f_pos); -+ err = rbytes; -+ } -+ if (unlikely(err < 0)) -+ break; -+ -+ all_zero = 0; -+ if (len >= rbytes && rbytes == blksize) -+ all_zero = !memcmp(buf, zp, rbytes); -+ if (!all_zero) { -+ wbytes = rbytes; -+ p = buf; -+ while (wbytes) { -+ size_t b; -+ -+ b = vfsub_write_k(dst, p, wbytes, &dst->f_pos); -+ err = b; -+ /* todo: signal_pending? */ -+ if (unlikely(err == -EAGAIN || err == -EINTR)) -+ continue; -+ if (unlikely(err < 0)) -+ break; -+ wbytes -= b; -+ p += b; -+ } -+ if (unlikely(err < 0)) -+ break; -+ } else { -+ loff_t res; -+ -+ AuLabel(hole); -+ res = vfsub_llseek(dst, rbytes, SEEK_CUR); -+ err = res; -+ if (unlikely(res < 0)) -+ break; -+ } -+ len -= rbytes; -+ err = 0; -+ } -+ -+ /* the last block may be a hole */ -+ if (!err && all_zero) { -+ AuLabel(last hole); -+ -+ err = 1; -+ if (au_test_nfs(dst->f_path.dentry->d_sb)) { -+ /* nfs requires this step to make last hole */ -+ /* is this only nfs? */ -+ do { -+ /* todo: signal_pending? */ -+ err = vfsub_write_k(dst, "\0", 1, &dst->f_pos); -+ } while (err == -EAGAIN || err == -EINTR); -+ if (err == 1) -+ dst->f_pos--; -+ } -+ -+ if (err == 1) { -+ ia = (void *)buf; -+ ia->ia_size = dst->f_pos; -+ ia->ia_valid = ATTR_SIZE | ATTR_FILE; -+ ia->ia_file = dst; -+ h_inode = file_inode(dst); -+ inode_lock_nested(h_inode, AuLsc_I_CHILD2); -+ /* no delegation since it is just created */ -+ err = vfsub_notify_change(&dst->f_path, ia, -+ /*delegated*/NULL); -+ inode_unlock(h_inode); -+ } -+ } -+ -+ return err; -+} -+ -+int au_copy_file(struct file *dst, struct file *src, loff_t len) -+{ -+ int err; -+ unsigned long blksize; -+ unsigned char do_kfree; -+ char *buf; -+ struct super_block *h_sb; -+ -+ err = -ENOMEM; -+ h_sb = file_inode(dst)->i_sb; -+ blksize = h_sb->s_blocksize; -+ if (!blksize || PAGE_SIZE < blksize) -+ blksize = PAGE_SIZE; -+ AuDbg("blksize %lu\n", blksize); -+ do_kfree = (blksize != PAGE_SIZE && blksize >= sizeof(struct iattr *)); -+ if (do_kfree) -+ buf = kmalloc(blksize, GFP_NOFS); -+ else -+ buf = (void *)__get_free_page(GFP_NOFS); -+ if (unlikely(!buf)) -+ goto out; -+ -+ if (len > (1 << 22)) -+ AuDbg("copying a large file %lld\n", (long long)len); -+ -+ src->f_pos = 0; -+ dst->f_pos = 0; -+ err = au_do_copy_file(dst, src, len, buf, blksize); -+ if (do_kfree) { -+ AuDebugOn(!au_kfree_do_sz_test(blksize)); -+ au_kfree_do_rcu(buf); -+ } else -+ free_page((unsigned long)buf); -+ -+out: -+ return err; -+} -+ -+static int au_do_copy(struct file *dst, struct file *src, loff_t len) -+{ -+ int err; -+ struct super_block *h_src_sb; -+ struct inode *h_src_inode; -+ -+ h_src_inode = file_inode(src); -+ h_src_sb = h_src_inode->i_sb; -+ -+ /* XFS acquires inode_lock */ -+ if (!au_test_xfs(h_src_sb)) -+ err = au_copy_file(dst, src, len); -+ else { -+ inode_unlock_shared(h_src_inode); -+ err = au_copy_file(dst, src, len); -+ inode_lock_shared_nested(h_src_inode, AuLsc_I_CHILD); -+ } -+ -+ return err; -+} -+ -+static int au_clone_or_copy(struct file *dst, struct file *src, loff_t len) -+{ -+ int err; -+ loff_t lo; -+ struct super_block *h_src_sb; -+ struct inode *h_src_inode; -+ -+ h_src_inode = file_inode(src); -+ h_src_sb = h_src_inode->i_sb; -+ if (h_src_sb != file_inode(dst)->i_sb -+ || !dst->f_op->remap_file_range) { -+ err = au_do_copy(dst, src, len); -+ goto out; -+ } -+ -+ if (!au_test_nfs(h_src_sb)) { -+ inode_unlock_shared(h_src_inode); -+ lo = vfsub_clone_file_range(src, dst, len); -+ inode_lock_shared_nested(h_src_inode, AuLsc_I_CHILD); -+ } else -+ lo = vfsub_clone_file_range(src, dst, len); -+ if (lo == len) { -+ err = 0; -+ goto out; /* success */ -+ } else if (lo >= 0) -+ /* todo: possible? */ -+ /* paritially succeeded */ -+ AuDbg("lo %lld, len %lld. Retrying.\n", lo, len); -+ else if (lo != -EOPNOTSUPP) { -+ /* older XFS has a condition in cloning */ -+ err = lo; -+ goto out; -+ } -+ -+ /* the backend fs on NFS may not support cloning */ -+ err = au_do_copy(dst, src, len); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* -+ * to support a sparse file which is opened with O_APPEND, -+ * we need to close the file. -+ */ -+static int au_cp_regular(struct au_cp_generic *cpg) -+{ -+ int err, i; -+ enum { SRC, DST }; -+ struct { -+ aufs_bindex_t bindex; -+ unsigned int flags; -+ struct dentry *dentry; -+ int force_wr; -+ struct file *file; -+ } *f, file[] = { -+ { -+ .bindex = cpg->bsrc, -+ .flags = O_RDONLY | O_NOATIME | O_LARGEFILE, -+ }, -+ { -+ .bindex = cpg->bdst, -+ .flags = O_WRONLY | O_NOATIME | O_LARGEFILE, -+ .force_wr = !!au_ftest_cpup(cpg->flags, RWDST), -+ } -+ }; -+ struct au_branch *br; -+ struct super_block *sb, *h_src_sb; -+ struct inode *h_src_inode; -+ struct task_struct *tsk = current; -+ -+ /* bsrc branch can be ro/rw. */ -+ sb = cpg->dentry->d_sb; -+ f = file; -+ for (i = 0; i < 2; i++, f++) { -+ f->dentry = au_h_dptr(cpg->dentry, f->bindex); -+ f->file = au_h_open(cpg->dentry, f->bindex, f->flags, -+ /*file*/NULL, f->force_wr); -+ if (IS_ERR(f->file)) { -+ err = PTR_ERR(f->file); -+ if (i == SRC) -+ goto out; -+ else -+ goto out_src; -+ } -+ } -+ -+ /* try stopping to update while we copyup */ -+ h_src_inode = d_inode(file[SRC].dentry); -+ h_src_sb = h_src_inode->i_sb; -+ if (!au_test_nfs(h_src_sb)) -+ IMustLock(h_src_inode); -+ err = au_clone_or_copy(file[DST].file, file[SRC].file, cpg->len); -+ -+ /* i wonder if we had O_NO_DELAY_FPUT flag */ -+ if (tsk->flags & PF_KTHREAD) -+ __fput_sync(file[DST].file); -+ else { -+ /* it happened actually */ -+ fput(file[DST].file); -+ /* -+ * too bad. -+ * we have to call both since we don't know which place the file -+ * was added to. -+ */ -+ task_work_run(); -+ flush_delayed_fput(); -+ } -+ br = au_sbr(sb, file[DST].bindex); -+ au_lcnt_dec(&br->br_nfiles); -+ -+out_src: -+ fput(file[SRC].file); -+ br = au_sbr(sb, file[SRC].bindex); -+ au_lcnt_dec(&br->br_nfiles); -+out: -+ return err; -+} -+ -+static int au_do_cpup_regular(struct au_cp_generic *cpg, -+ struct au_cpup_reg_attr *h_src_attr) -+{ -+ int err, rerr; -+ loff_t l; -+ struct path h_path; -+ struct inode *h_src_inode, *h_dst_inode; -+ -+ err = 0; -+ h_src_inode = au_h_iptr(d_inode(cpg->dentry), cpg->bsrc); -+ l = i_size_read(h_src_inode); -+ if (cpg->len == -1 || l < cpg->len) -+ cpg->len = l; -+ if (cpg->len) { -+ /* try stopping to update while we are referencing */ -+ inode_lock_shared_nested(h_src_inode, AuLsc_I_CHILD); -+ au_pin_hdir_unlock(cpg->pin); -+ -+ h_path.dentry = au_h_dptr(cpg->dentry, cpg->bsrc); -+ h_path.mnt = au_sbr_mnt(cpg->dentry->d_sb, cpg->bsrc); -+ h_src_attr->iflags = h_src_inode->i_flags; -+ if (!au_test_nfs(h_src_inode->i_sb)) -+ err = vfsub_getattr(&h_path, &h_src_attr->st); -+ else { -+ inode_unlock_shared(h_src_inode); -+ err = vfsub_getattr(&h_path, &h_src_attr->st); -+ inode_lock_shared_nested(h_src_inode, AuLsc_I_CHILD); -+ } -+ if (unlikely(err)) { -+ inode_unlock_shared(h_src_inode); -+ goto out; -+ } -+ h_src_attr->valid = 1; -+ if (!au_test_nfs(h_src_inode->i_sb)) { -+ err = au_cp_regular(cpg); -+ inode_unlock_shared(h_src_inode); -+ } else { -+ inode_unlock_shared(h_src_inode); -+ err = au_cp_regular(cpg); -+ } -+ rerr = au_pin_hdir_relock(cpg->pin); -+ if (!err && rerr) -+ err = rerr; -+ } -+ if (!err && (h_src_inode->i_state & I_LINKABLE)) { -+ h_path.dentry = au_h_dptr(cpg->dentry, cpg->bdst); -+ h_dst_inode = d_inode(h_path.dentry); -+ spin_lock(&h_dst_inode->i_lock); -+ h_dst_inode->i_state |= I_LINKABLE; -+ spin_unlock(&h_dst_inode->i_lock); -+ } -+ -+out: -+ return err; -+} -+ -+static int au_do_cpup_symlink(struct path *h_path, struct dentry *h_src, -+ struct inode *h_dir) -+{ -+ int err, symlen; -+ mm_segment_t old_fs; -+ union { -+ char *k; -+ char __user *u; -+ } sym; -+ -+ err = -ENOMEM; -+ sym.k = (void *)__get_free_page(GFP_NOFS); -+ if (unlikely(!sym.k)) -+ goto out; -+ -+ /* unnecessary to support mmap_sem since symlink is not mmap-able */ -+ old_fs = get_fs(); -+ set_fs(KERNEL_DS); -+ symlen = vfs_readlink(h_src, sym.u, PATH_MAX); -+ err = symlen; -+ set_fs(old_fs); -+ -+ if (symlen > 0) { -+ sym.k[symlen] = 0; -+ err = vfsub_symlink(h_dir, h_path, sym.k); -+ } -+ free_page((unsigned long)sym.k); -+ -+out: -+ return err; -+} -+ -+/* -+ * regardless 'acl' option, reset all ACL. -+ * All ACL will be copied up later from the original entry on the lower branch. -+ */ -+static int au_reset_acl(struct inode *h_dir, struct path *h_path, umode_t mode) -+{ -+ int err; -+ struct dentry *h_dentry; -+ struct inode *h_inode; -+ -+ h_dentry = h_path->dentry; -+ h_inode = d_inode(h_dentry); -+ /* forget_all_cached_acls(h_inode)); */ -+ err = vfsub_removexattr(h_dentry, XATTR_NAME_POSIX_ACL_ACCESS); -+ AuTraceErr(err); -+ if (err == -EOPNOTSUPP) -+ err = 0; -+ if (!err) -+ err = vfsub_acl_chmod(h_inode, mode); -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+static int au_do_cpup_dir(struct au_cp_generic *cpg, struct dentry *dst_parent, -+ struct inode *h_dir, struct path *h_path) -+{ -+ int err; -+ struct inode *dir, *inode; -+ -+ err = vfsub_removexattr(h_path->dentry, XATTR_NAME_POSIX_ACL_DEFAULT); -+ AuTraceErr(err); -+ if (err == -EOPNOTSUPP) -+ err = 0; -+ if (unlikely(err)) -+ goto out; -+ -+ /* -+ * strange behaviour from the users view, -+ * particularly setattr case -+ */ -+ dir = d_inode(dst_parent); -+ if (au_ibtop(dir) == cpg->bdst) -+ au_cpup_attr_nlink(dir, /*force*/1); -+ inode = d_inode(cpg->dentry); -+ au_cpup_attr_nlink(inode, /*force*/1); -+ -+out: -+ return err; -+} -+ -+static noinline_for_stack -+int cpup_entry(struct au_cp_generic *cpg, struct dentry *dst_parent, -+ struct au_cpup_reg_attr *h_src_attr) -+{ -+ int err; -+ umode_t mode; -+ unsigned int mnt_flags; -+ unsigned char isdir, isreg, force; -+ const unsigned char do_dt = !!au_ftest_cpup(cpg->flags, DTIME); -+ struct au_dtime dt; -+ struct path h_path; -+ struct dentry *h_src, *h_dst, *h_parent; -+ struct inode *h_inode, *h_dir; -+ struct super_block *sb; -+ -+ /* bsrc branch can be ro/rw. */ -+ h_src = au_h_dptr(cpg->dentry, cpg->bsrc); -+ h_inode = d_inode(h_src); -+ AuDebugOn(h_inode != au_h_iptr(d_inode(cpg->dentry), cpg->bsrc)); -+ -+ /* try stopping to be referenced while we are creating */ -+ h_dst = au_h_dptr(cpg->dentry, cpg->bdst); -+ if (au_ftest_cpup(cpg->flags, RENAME)) -+ AuDebugOn(strncmp(h_dst->d_name.name, AUFS_WH_PFX, -+ AUFS_WH_PFX_LEN)); -+ h_parent = h_dst->d_parent; /* dir inode is locked */ -+ h_dir = d_inode(h_parent); -+ IMustLock(h_dir); -+ AuDebugOn(h_parent != h_dst->d_parent); -+ -+ sb = cpg->dentry->d_sb; -+ h_path.mnt = au_sbr_mnt(sb, cpg->bdst); -+ if (do_dt) { -+ h_path.dentry = h_parent; -+ au_dtime_store(&dt, dst_parent, &h_path); -+ } -+ h_path.dentry = h_dst; -+ -+ isreg = 0; -+ isdir = 0; -+ mode = h_inode->i_mode; -+ switch (mode & S_IFMT) { -+ case S_IFREG: -+ isreg = 1; -+ err = vfsub_create(h_dir, &h_path, 0600, /*want_excl*/true); -+ if (!err) -+ err = au_do_cpup_regular(cpg, h_src_attr); -+ break; -+ case S_IFDIR: -+ isdir = 1; -+ err = vfsub_mkdir(h_dir, &h_path, mode); -+ if (!err) -+ err = au_do_cpup_dir(cpg, dst_parent, h_dir, &h_path); -+ break; -+ case S_IFLNK: -+ err = au_do_cpup_symlink(&h_path, h_src, h_dir); -+ break; -+ case S_IFCHR: -+ case S_IFBLK: -+ AuDebugOn(!capable(CAP_MKNOD)); -+ /*FALLTHROUGH*/ -+ case S_IFIFO: -+ case S_IFSOCK: -+ err = vfsub_mknod(h_dir, &h_path, mode, h_inode->i_rdev); -+ break; -+ default: -+ AuIOErr("Unknown inode type 0%o\n", mode); -+ err = -EIO; -+ } -+ if (!err) -+ err = au_reset_acl(h_dir, &h_path, mode); -+ -+ mnt_flags = au_mntflags(sb); -+ if (!au_opt_test(mnt_flags, UDBA_NONE) -+ && !isdir -+ && au_opt_test(mnt_flags, XINO) -+ && (h_inode->i_nlink == 1 -+ || (h_inode->i_state & I_LINKABLE)) -+ /* todo: unnecessary? */ -+ /* && d_inode(cpg->dentry)->i_nlink == 1 */ -+ && cpg->bdst < cpg->bsrc -+ && !au_ftest_cpup(cpg->flags, KEEPLINO)) -+ au_xino_write(sb, cpg->bsrc, h_inode->i_ino, /*ino*/0); -+ /* ignore this error */ -+ -+ if (!err) { -+ force = 0; -+ if (isreg) { -+ force = !!cpg->len; -+ if (cpg->len == -1) -+ force = !!i_size_read(h_inode); -+ } -+ au_fhsm_wrote(sb, cpg->bdst, force); -+ } -+ -+ if (do_dt) -+ au_dtime_revert(&dt); -+ return err; -+} -+ -+static int au_do_ren_after_cpup(struct au_cp_generic *cpg, struct path *h_path) -+{ -+ int err; -+ struct dentry *dentry, *h_dentry, *h_parent, *parent; -+ struct inode *h_dir; -+ aufs_bindex_t bdst; -+ -+ dentry = cpg->dentry; -+ bdst = cpg->bdst; -+ h_dentry = au_h_dptr(dentry, bdst); -+ if (!au_ftest_cpup(cpg->flags, OVERWRITE)) { -+ dget(h_dentry); -+ au_set_h_dptr(dentry, bdst, NULL); -+ err = au_lkup_neg(dentry, bdst, /*wh*/0); -+ if (!err) -+ h_path->dentry = dget(au_h_dptr(dentry, bdst)); -+ au_set_h_dptr(dentry, bdst, h_dentry); -+ } else { -+ err = 0; -+ parent = dget_parent(dentry); -+ h_parent = au_h_dptr(parent, bdst); -+ dput(parent); -+ h_path->dentry = vfsub_lkup_one(&dentry->d_name, h_parent); -+ if (IS_ERR(h_path->dentry)) -+ err = PTR_ERR(h_path->dentry); -+ } -+ if (unlikely(err)) -+ goto out; -+ -+ h_parent = h_dentry->d_parent; /* dir inode is locked */ -+ h_dir = d_inode(h_parent); -+ IMustLock(h_dir); -+ AuDbg("%pd %pd\n", h_dentry, h_path->dentry); -+ /* no delegation since it is just created */ -+ err = vfsub_rename(h_dir, h_dentry, h_dir, h_path, /*delegated*/NULL, -+ /*flags*/0); -+ dput(h_path->dentry); -+ -+out: -+ return err; -+} -+ -+/* -+ * copyup the @dentry from @bsrc to @bdst. -+ * the caller must set the both of lower dentries. -+ * @len is for truncating when it is -1 copyup the entire file. -+ * in link/rename cases, @dst_parent may be different from the real one. -+ * basic->bsrc can be larger than basic->bdst. -+ * aufs doesn't touch the credential so -+ * security_inode_copy_up{,_xattr}() are unnecessary. -+ */ -+static int au_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent) -+{ -+ int err, rerr; -+ aufs_bindex_t old_ibtop; -+ unsigned char isdir, plink; -+ struct dentry *h_src, *h_dst, *h_parent; -+ struct inode *dst_inode, *h_dir, *inode, *delegated, *src_inode; -+ struct super_block *sb; -+ struct au_branch *br; -+ /* to reduce stack size */ -+ struct { -+ struct au_dtime dt; -+ struct path h_path; -+ struct au_cpup_reg_attr h_src_attr; -+ } *a; -+ -+ err = -ENOMEM; -+ a = kmalloc(sizeof(*a), GFP_NOFS); -+ if (unlikely(!a)) -+ goto out; -+ a->h_src_attr.valid = 0; -+ -+ sb = cpg->dentry->d_sb; -+ br = au_sbr(sb, cpg->bdst); -+ a->h_path.mnt = au_br_mnt(br); -+ h_dst = au_h_dptr(cpg->dentry, cpg->bdst); -+ h_parent = h_dst->d_parent; /* dir inode is locked */ -+ h_dir = d_inode(h_parent); -+ IMustLock(h_dir); -+ -+ h_src = au_h_dptr(cpg->dentry, cpg->bsrc); -+ inode = d_inode(cpg->dentry); -+ -+ if (!dst_parent) -+ dst_parent = dget_parent(cpg->dentry); -+ else -+ dget(dst_parent); -+ -+ plink = !!au_opt_test(au_mntflags(sb), PLINK); -+ dst_inode = au_h_iptr(inode, cpg->bdst); -+ if (dst_inode) { -+ if (unlikely(!plink)) { -+ err = -EIO; -+ AuIOErr("hi%lu(i%lu) exists on b%d " -+ "but plink is disabled\n", -+ dst_inode->i_ino, inode->i_ino, cpg->bdst); -+ goto out_parent; -+ } -+ -+ if (dst_inode->i_nlink) { -+ const int do_dt = au_ftest_cpup(cpg->flags, DTIME); -+ -+ h_src = au_plink_lkup(inode, cpg->bdst); -+ err = PTR_ERR(h_src); -+ if (IS_ERR(h_src)) -+ goto out_parent; -+ if (unlikely(d_is_negative(h_src))) { -+ err = -EIO; -+ AuIOErr("i%lu exists on b%d " -+ "but not pseudo-linked\n", -+ inode->i_ino, cpg->bdst); -+ dput(h_src); -+ goto out_parent; -+ } -+ -+ if (do_dt) { -+ a->h_path.dentry = h_parent; -+ au_dtime_store(&a->dt, dst_parent, &a->h_path); -+ } -+ -+ a->h_path.dentry = h_dst; -+ delegated = NULL; -+ err = vfsub_link(h_src, h_dir, &a->h_path, &delegated); -+ if (!err && au_ftest_cpup(cpg->flags, RENAME)) -+ err = au_do_ren_after_cpup(cpg, &a->h_path); -+ if (do_dt) -+ au_dtime_revert(&a->dt); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal link\n"); -+ iput(delegated); -+ } -+ dput(h_src); -+ goto out_parent; -+ } else -+ /* todo: cpup_wh_file? */ -+ /* udba work */ -+ au_update_ibrange(inode, /*do_put_zero*/1); -+ } -+ -+ isdir = S_ISDIR(inode->i_mode); -+ old_ibtop = au_ibtop(inode); -+ err = cpup_entry(cpg, dst_parent, &a->h_src_attr); -+ if (unlikely(err)) -+ goto out_rev; -+ dst_inode = d_inode(h_dst); -+ inode_lock_nested(dst_inode, AuLsc_I_CHILD2); -+ /* todo: necessary? */ -+ /* au_pin_hdir_unlock(cpg->pin); */ -+ -+ err = cpup_iattr(cpg->dentry, cpg->bdst, h_src, &a->h_src_attr); -+ if (unlikely(err)) { -+ /* todo: necessary? */ -+ /* au_pin_hdir_relock(cpg->pin); */ /* ignore an error */ -+ inode_unlock(dst_inode); -+ goto out_rev; -+ } -+ -+ if (cpg->bdst < old_ibtop) { -+ if (S_ISREG(inode->i_mode)) { -+ err = au_dy_iaop(inode, cpg->bdst, dst_inode); -+ if (unlikely(err)) { -+ /* ignore an error */ -+ /* au_pin_hdir_relock(cpg->pin); */ -+ inode_unlock(dst_inode); -+ goto out_rev; -+ } -+ } -+ au_set_ibtop(inode, cpg->bdst); -+ } else -+ au_set_ibbot(inode, cpg->bdst); -+ au_set_h_iptr(inode, cpg->bdst, au_igrab(dst_inode), -+ au_hi_flags(inode, isdir)); -+ -+ /* todo: necessary? */ -+ /* err = au_pin_hdir_relock(cpg->pin); */ -+ inode_unlock(dst_inode); -+ if (unlikely(err)) -+ goto out_rev; -+ -+ src_inode = d_inode(h_src); -+ if (!isdir -+ && (src_inode->i_nlink > 1 -+ || src_inode->i_state & I_LINKABLE) -+ && plink) -+ au_plink_append(inode, cpg->bdst, h_dst); -+ -+ if (au_ftest_cpup(cpg->flags, RENAME)) { -+ a->h_path.dentry = h_dst; -+ err = au_do_ren_after_cpup(cpg, &a->h_path); -+ } -+ if (!err) -+ goto out_parent; /* success */ -+ -+ /* revert */ -+out_rev: -+ a->h_path.dentry = h_parent; -+ au_dtime_store(&a->dt, dst_parent, &a->h_path); -+ a->h_path.dentry = h_dst; -+ rerr = 0; -+ if (d_is_positive(h_dst)) { -+ if (!isdir) { -+ /* no delegation since it is just created */ -+ rerr = vfsub_unlink(h_dir, &a->h_path, -+ /*delegated*/NULL, /*force*/0); -+ } else -+ rerr = vfsub_rmdir(h_dir, &a->h_path); -+ } -+ au_dtime_revert(&a->dt); -+ if (rerr) { -+ AuIOErr("failed removing broken entry(%d, %d)\n", err, rerr); -+ err = -EIO; -+ } -+out_parent: -+ dput(dst_parent); -+ au_kfree_rcu(a); -+out: -+ return err; -+} -+ -+#if 0 /* reserved */ -+struct au_cpup_single_args { -+ int *errp; -+ struct au_cp_generic *cpg; -+ struct dentry *dst_parent; -+}; -+ -+static void au_call_cpup_single(void *args) -+{ -+ struct au_cpup_single_args *a = args; -+ -+ au_pin_hdir_acquire_nest(a->cpg->pin); -+ *a->errp = au_cpup_single(a->cpg, a->dst_parent); -+ au_pin_hdir_release(a->cpg->pin); -+} -+#endif -+ -+/* -+ * prevent SIGXFSZ in copy-up. -+ * testing CAP_MKNOD is for generic fs, -+ * but CAP_FSETID is for xfs only, currently. -+ */ -+static int au_cpup_sio_test(struct au_pin *pin, umode_t mode) -+{ -+ int do_sio; -+ struct super_block *sb; -+ struct inode *h_dir; -+ -+ do_sio = 0; -+ sb = au_pinned_parent(pin)->d_sb; -+ if (!au_wkq_test() -+ && (!au_sbi(sb)->si_plink_maint_pid -+ || au_plink_maint(sb, AuLock_NOPLM))) { -+ switch (mode & S_IFMT) { -+ case S_IFREG: -+ /* no condition about RLIMIT_FSIZE and the file size */ -+ do_sio = 1; -+ break; -+ case S_IFCHR: -+ case S_IFBLK: -+ do_sio = !capable(CAP_MKNOD); -+ break; -+ } -+ if (!do_sio) -+ do_sio = ((mode & (S_ISUID | S_ISGID)) -+ && !capable(CAP_FSETID)); -+ /* this workaround may be removed in the future */ -+ if (!do_sio) { -+ h_dir = au_pinned_h_dir(pin); -+ do_sio = h_dir->i_mode & S_ISVTX; -+ } -+ } -+ -+ return do_sio; -+} -+ -+#if 0 /* reserved */ -+int au_sio_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent) -+{ -+ int err, wkq_err; -+ struct dentry *h_dentry; -+ -+ h_dentry = au_h_dptr(cpg->dentry, cpg->bsrc); -+ if (!au_cpup_sio_test(pin, d_inode(h_dentry)->i_mode)) -+ err = au_cpup_single(cpg, dst_parent); -+ else { -+ struct au_cpup_single_args args = { -+ .errp = &err, -+ .cpg = cpg, -+ .dst_parent = dst_parent -+ }; -+ wkq_err = au_wkq_wait(au_call_cpup_single, &args); -+ if (unlikely(wkq_err)) -+ err = wkq_err; -+ } -+ -+ return err; -+} -+#endif -+ -+/* -+ * copyup the @dentry from the first active lower branch to @bdst, -+ * using au_cpup_single(). -+ */ -+static int au_cpup_simple(struct au_cp_generic *cpg) -+{ -+ int err; -+ unsigned int flags_orig; -+ struct dentry *dentry; -+ -+ AuDebugOn(cpg->bsrc < 0); -+ -+ dentry = cpg->dentry; -+ DiMustWriteLock(dentry); -+ -+ err = au_lkup_neg(dentry, cpg->bdst, /*wh*/1); -+ if (!err) { -+ flags_orig = cpg->flags; -+ au_fset_cpup(cpg->flags, RENAME); -+ err = au_cpup_single(cpg, NULL); -+ cpg->flags = flags_orig; -+ if (!err) -+ return 0; /* success */ -+ -+ /* revert */ -+ au_set_h_dptr(dentry, cpg->bdst, NULL); -+ au_set_dbtop(dentry, cpg->bsrc); -+ } -+ -+ return err; -+} -+ -+struct au_cpup_simple_args { -+ int *errp; -+ struct au_cp_generic *cpg; -+}; -+ -+static void au_call_cpup_simple(void *args) -+{ -+ struct au_cpup_simple_args *a = args; -+ -+ au_pin_hdir_acquire_nest(a->cpg->pin); -+ *a->errp = au_cpup_simple(a->cpg); -+ au_pin_hdir_release(a->cpg->pin); -+} -+ -+static int au_do_sio_cpup_simple(struct au_cp_generic *cpg) -+{ -+ int err, wkq_err; -+ struct dentry *dentry, *parent; -+ struct file *h_file; -+ struct inode *h_dir; -+ -+ dentry = cpg->dentry; -+ h_file = NULL; -+ if (au_ftest_cpup(cpg->flags, HOPEN)) { -+ AuDebugOn(cpg->bsrc < 0); -+ h_file = au_h_open_pre(dentry, cpg->bsrc, /*force_wr*/0); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out; -+ } -+ -+ parent = dget_parent(dentry); -+ h_dir = au_h_iptr(d_inode(parent), cpg->bdst); -+ if (!au_test_h_perm_sio(h_dir, MAY_EXEC | MAY_WRITE) -+ && !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode)) -+ err = au_cpup_simple(cpg); -+ else { -+ struct au_cpup_simple_args args = { -+ .errp = &err, -+ .cpg = cpg -+ }; -+ wkq_err = au_wkq_wait(au_call_cpup_simple, &args); -+ if (unlikely(wkq_err)) -+ err = wkq_err; -+ } -+ -+ dput(parent); -+ if (h_file) -+ au_h_open_post(dentry, cpg->bsrc, h_file); -+ -+out: -+ return err; -+} -+ -+int au_sio_cpup_simple(struct au_cp_generic *cpg) -+{ -+ aufs_bindex_t bsrc, bbot; -+ struct dentry *dentry, *h_dentry; -+ -+ if (cpg->bsrc < 0) { -+ dentry = cpg->dentry; -+ bbot = au_dbbot(dentry); -+ for (bsrc = cpg->bdst + 1; bsrc <= bbot; bsrc++) { -+ h_dentry = au_h_dptr(dentry, bsrc); -+ if (h_dentry) { -+ AuDebugOn(d_is_negative(h_dentry)); -+ break; -+ } -+ } -+ AuDebugOn(bsrc > bbot); -+ cpg->bsrc = bsrc; -+ } -+ AuDebugOn(cpg->bsrc <= cpg->bdst); -+ return au_do_sio_cpup_simple(cpg); -+} -+ -+int au_sio_cpdown_simple(struct au_cp_generic *cpg) -+{ -+ AuDebugOn(cpg->bdst <= cpg->bsrc); -+ return au_do_sio_cpup_simple(cpg); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * copyup the deleted file for writing. -+ */ -+static int au_do_cpup_wh(struct au_cp_generic *cpg, struct dentry *wh_dentry, -+ struct file *file) -+{ -+ int err; -+ unsigned int flags_orig; -+ aufs_bindex_t bsrc_orig; -+ struct au_dinfo *dinfo; -+ struct { -+ struct au_hdentry *hd; -+ struct dentry *h_dentry; -+ } hdst, hsrc; -+ -+ dinfo = au_di(cpg->dentry); -+ AuRwMustWriteLock(&dinfo->di_rwsem); -+ -+ bsrc_orig = cpg->bsrc; -+ cpg->bsrc = dinfo->di_btop; -+ hdst.hd = au_hdentry(dinfo, cpg->bdst); -+ hdst.h_dentry = hdst.hd->hd_dentry; -+ hdst.hd->hd_dentry = wh_dentry; -+ dinfo->di_btop = cpg->bdst; -+ -+ hsrc.h_dentry = NULL; -+ if (file) { -+ hsrc.hd = au_hdentry(dinfo, cpg->bsrc); -+ hsrc.h_dentry = hsrc.hd->hd_dentry; -+ hsrc.hd->hd_dentry = au_hf_top(file)->f_path.dentry; -+ } -+ flags_orig = cpg->flags; -+ cpg->flags = !AuCpup_DTIME; -+ err = au_cpup_single(cpg, /*h_parent*/NULL); -+ cpg->flags = flags_orig; -+ if (file) { -+ if (!err) -+ err = au_reopen_nondir(file); -+ hsrc.hd->hd_dentry = hsrc.h_dentry; -+ } -+ hdst.hd->hd_dentry = hdst.h_dentry; -+ dinfo->di_btop = cpg->bsrc; -+ cpg->bsrc = bsrc_orig; -+ -+ return err; -+} -+ -+static int au_cpup_wh(struct au_cp_generic *cpg, struct file *file) -+{ -+ int err; -+ aufs_bindex_t bdst; -+ struct au_dtime dt; -+ struct dentry *dentry, *parent, *h_parent, *wh_dentry; -+ struct au_branch *br; -+ struct path h_path; -+ -+ dentry = cpg->dentry; -+ bdst = cpg->bdst; -+ br = au_sbr(dentry->d_sb, bdst); -+ parent = dget_parent(dentry); -+ h_parent = au_h_dptr(parent, bdst); -+ wh_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name); -+ err = PTR_ERR(wh_dentry); -+ if (IS_ERR(wh_dentry)) -+ goto out; -+ -+ h_path.dentry = h_parent; -+ h_path.mnt = au_br_mnt(br); -+ au_dtime_store(&dt, parent, &h_path); -+ err = au_do_cpup_wh(cpg, wh_dentry, file); -+ if (unlikely(err)) -+ goto out_wh; -+ -+ dget(wh_dentry); -+ h_path.dentry = wh_dentry; -+ if (!d_is_dir(wh_dentry)) { -+ /* no delegation since it is just created */ -+ err = vfsub_unlink(d_inode(h_parent), &h_path, -+ /*delegated*/NULL, /*force*/0); -+ } else -+ err = vfsub_rmdir(d_inode(h_parent), &h_path); -+ if (unlikely(err)) { -+ AuIOErr("failed remove copied-up tmp file %pd(%d)\n", -+ wh_dentry, err); -+ err = -EIO; -+ } -+ au_dtime_revert(&dt); -+ au_set_hi_wh(d_inode(dentry), bdst, wh_dentry); -+ -+out_wh: -+ dput(wh_dentry); -+out: -+ dput(parent); -+ return err; -+} -+ -+struct au_cpup_wh_args { -+ int *errp; -+ struct au_cp_generic *cpg; -+ struct file *file; -+}; -+ -+static void au_call_cpup_wh(void *args) -+{ -+ struct au_cpup_wh_args *a = args; -+ -+ au_pin_hdir_acquire_nest(a->cpg->pin); -+ *a->errp = au_cpup_wh(a->cpg, a->file); -+ au_pin_hdir_release(a->cpg->pin); -+} -+ -+int au_sio_cpup_wh(struct au_cp_generic *cpg, struct file *file) -+{ -+ int err, wkq_err; -+ aufs_bindex_t bdst; -+ struct dentry *dentry, *parent, *h_orph, *h_parent; -+ struct inode *dir, *h_dir, *h_tmpdir; -+ struct au_wbr *wbr; -+ struct au_pin wh_pin, *pin_orig; -+ -+ dentry = cpg->dentry; -+ bdst = cpg->bdst; -+ parent = dget_parent(dentry); -+ dir = d_inode(parent); -+ h_orph = NULL; -+ h_parent = NULL; -+ h_dir = au_igrab(au_h_iptr(dir, bdst)); -+ h_tmpdir = h_dir; -+ pin_orig = NULL; -+ if (!h_dir->i_nlink) { -+ wbr = au_sbr(dentry->d_sb, bdst)->br_wbr; -+ h_orph = wbr->wbr_orph; -+ -+ h_parent = dget(au_h_dptr(parent, bdst)); -+ au_set_h_dptr(parent, bdst, dget(h_orph)); -+ h_tmpdir = d_inode(h_orph); -+ au_set_h_iptr(dir, bdst, au_igrab(h_tmpdir), /*flags*/0); -+ -+ inode_lock_nested(h_tmpdir, AuLsc_I_PARENT3); -+ /* todo: au_h_open_pre()? */ -+ -+ pin_orig = cpg->pin; -+ au_pin_init(&wh_pin, dentry, bdst, AuLsc_DI_PARENT, -+ AuLsc_I_PARENT3, cpg->pin->udba, AuPin_DI_LOCKED); -+ cpg->pin = &wh_pin; -+ } -+ -+ if (!au_test_h_perm_sio(h_tmpdir, MAY_EXEC | MAY_WRITE) -+ && !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode)) -+ err = au_cpup_wh(cpg, file); -+ else { -+ struct au_cpup_wh_args args = { -+ .errp = &err, -+ .cpg = cpg, -+ .file = file -+ }; -+ wkq_err = au_wkq_wait(au_call_cpup_wh, &args); -+ if (unlikely(wkq_err)) -+ err = wkq_err; -+ } -+ -+ if (h_orph) { -+ inode_unlock(h_tmpdir); -+ /* todo: au_h_open_post()? */ -+ au_set_h_iptr(dir, bdst, au_igrab(h_dir), /*flags*/0); -+ au_set_h_dptr(parent, bdst, h_parent); -+ AuDebugOn(!pin_orig); -+ cpg->pin = pin_orig; -+ } -+ iput(h_dir); -+ dput(parent); -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * generic routine for both of copy-up and copy-down. -+ */ -+/* cf. revalidate function in file.c */ -+int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst, -+ int (*cp)(struct dentry *dentry, aufs_bindex_t bdst, -+ struct au_pin *pin, -+ struct dentry *h_parent, void *arg), -+ void *arg) -+{ -+ int err; -+ struct au_pin pin; -+ struct dentry *d, *parent, *h_parent, *real_parent, *h_dentry; -+ -+ err = 0; -+ parent = dget_parent(dentry); -+ if (IS_ROOT(parent)) -+ goto out; -+ -+ au_pin_init(&pin, dentry, bdst, AuLsc_DI_PARENT2, AuLsc_I_PARENT2, -+ au_opt_udba(dentry->d_sb), AuPin_MNT_WRITE); -+ -+ /* do not use au_dpage */ -+ real_parent = parent; -+ while (1) { -+ dput(parent); -+ parent = dget_parent(dentry); -+ h_parent = au_h_dptr(parent, bdst); -+ if (h_parent) -+ goto out; /* success */ -+ -+ /* find top dir which is necessary to cpup */ -+ do { -+ d = parent; -+ dput(parent); -+ parent = dget_parent(d); -+ di_read_lock_parent3(parent, !AuLock_IR); -+ h_parent = au_h_dptr(parent, bdst); -+ di_read_unlock(parent, !AuLock_IR); -+ } while (!h_parent); -+ -+ if (d != real_parent) -+ di_write_lock_child3(d); -+ -+ /* somebody else might create while we were sleeping */ -+ h_dentry = au_h_dptr(d, bdst); -+ if (!h_dentry || d_is_negative(h_dentry)) { -+ if (h_dentry) -+ au_update_dbtop(d); -+ -+ au_pin_set_dentry(&pin, d); -+ err = au_do_pin(&pin); -+ if (!err) { -+ err = cp(d, bdst, &pin, h_parent, arg); -+ au_unpin(&pin); -+ } -+ } -+ -+ if (d != real_parent) -+ di_write_unlock(d); -+ if (unlikely(err)) -+ break; -+ } -+ -+out: -+ dput(parent); -+ return err; -+} -+ -+static int au_cpup_dir(struct dentry *dentry, aufs_bindex_t bdst, -+ struct au_pin *pin, -+ struct dentry *h_parent __maybe_unused, -+ void *arg __maybe_unused) -+{ -+ struct au_cp_generic cpg = { -+ .dentry = dentry, -+ .bdst = bdst, -+ .bsrc = -1, -+ .len = 0, -+ .pin = pin, -+ .flags = AuCpup_DTIME -+ }; -+ return au_sio_cpup_simple(&cpg); -+} -+ -+int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst) -+{ -+ return au_cp_dirs(dentry, bdst, au_cpup_dir, NULL); -+} -+ -+int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst) -+{ -+ int err; -+ struct dentry *parent; -+ struct inode *dir; -+ -+ parent = dget_parent(dentry); -+ dir = d_inode(parent); -+ err = 0; -+ if (au_h_iptr(dir, bdst)) -+ goto out; -+ -+ di_read_unlock(parent, AuLock_IR); -+ di_write_lock_parent(parent); -+ /* someone else might change our inode while we were sleeping */ -+ if (!au_h_iptr(dir, bdst)) -+ err = au_cpup_dirs(dentry, bdst); -+ di_downgrade_lock(parent, AuLock_IR); -+ -+out: -+ dput(parent); -+ return err; -+} -diff --git a/fs/aufs/cpup.h b/fs/aufs/cpup.h -new file mode 100644 -index 000000000000..abcbfbc55a5c ---- /dev/null -+++ b/fs/aufs/cpup.h -@@ -0,0 +1,100 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * copy-up/down functions -+ */ -+ -+#ifndef __AUFS_CPUP_H__ -+#define __AUFS_CPUP_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/path.h> -+ -+struct inode; -+struct file; -+struct au_pin; -+ -+void au_cpup_attr_flags(struct inode *dst, unsigned int iflags); -+void au_cpup_attr_timesizes(struct inode *inode); -+void au_cpup_attr_nlink(struct inode *inode, int force); -+void au_cpup_attr_changeable(struct inode *inode); -+void au_cpup_igen(struct inode *inode, struct inode *h_inode); -+void au_cpup_attr_all(struct inode *inode, int force); -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct au_cp_generic { -+ struct dentry *dentry; -+ aufs_bindex_t bdst, bsrc; -+ loff_t len; -+ struct au_pin *pin; -+ unsigned int flags; -+}; -+ -+/* cpup flags */ -+#define AuCpup_DTIME 1 /* do dtime_store/revert */ -+#define AuCpup_KEEPLINO (1 << 1) /* do not clear the lower xino, -+ for link(2) */ -+#define AuCpup_RENAME (1 << 2) /* rename after cpup */ -+#define AuCpup_HOPEN (1 << 3) /* call h_open_pre/post() in -+ cpup */ -+#define AuCpup_OVERWRITE (1 << 4) /* allow overwriting the -+ existing entry */ -+#define AuCpup_RWDST (1 << 5) /* force write target even if -+ the branch is marked as RO */ -+ -+#ifndef CONFIG_AUFS_BR_HFSPLUS -+#undef AuCpup_HOPEN -+#define AuCpup_HOPEN 0 -+#endif -+ -+#define au_ftest_cpup(flags, name) ((flags) & AuCpup_##name) -+#define au_fset_cpup(flags, name) \ -+ do { (flags) |= AuCpup_##name; } while (0) -+#define au_fclr_cpup(flags, name) \ -+ do { (flags) &= ~AuCpup_##name; } while (0) -+ -+int au_copy_file(struct file *dst, struct file *src, loff_t len); -+int au_sio_cpup_simple(struct au_cp_generic *cpg); -+int au_sio_cpdown_simple(struct au_cp_generic *cpg); -+int au_sio_cpup_wh(struct au_cp_generic *cpg, struct file *file); -+ -+int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst, -+ int (*cp)(struct dentry *dentry, aufs_bindex_t bdst, -+ struct au_pin *pin, -+ struct dentry *h_parent, void *arg), -+ void *arg); -+int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst); -+int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst); -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* keep timestamps when copyup */ -+struct au_dtime { -+ struct dentry *dt_dentry; -+ struct path dt_h_path; -+ struct timespec64 dt_atime, dt_mtime; -+}; -+void au_dtime_store(struct au_dtime *dt, struct dentry *dentry, -+ struct path *h_path); -+void au_dtime_revert(struct au_dtime *dt); -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_CPUP_H__ */ -diff --git a/fs/aufs/dbgaufs.c b/fs/aufs/dbgaufs.c -new file mode 100644 -index 000000000000..e32d91d1f638 ---- /dev/null -+++ b/fs/aufs/dbgaufs.c -@@ -0,0 +1,526 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * debugfs interface -+ */ -+ -+#include <linux/debugfs.h> -+#include "aufs.h" -+ -+#ifndef CONFIG_SYSFS -+#error DEBUG_FS depends upon SYSFS -+#endif -+ -+static struct dentry *dbgaufs; -+static const mode_t dbgaufs_mode = 0444; -+ -+/* 20 is max digits length of ulong 64 */ -+struct dbgaufs_arg { -+ int n; -+ char a[20 * 4]; -+}; -+ -+/* -+ * common function for all XINO files -+ */ -+static int dbgaufs_xi_release(struct inode *inode __maybe_unused, -+ struct file *file) -+{ -+ void *p; -+ -+ p = file->private_data; -+ if (p) { -+ /* this is struct dbgaufs_arg */ -+ AuDebugOn(!au_kfree_sz_test(p)); -+ au_kfree_do_rcu(p); -+ } -+ return 0; -+} -+ -+static int dbgaufs_xi_open(struct file *xf, struct file *file, int do_fcnt, -+ int cnt) -+{ -+ int err; -+ struct kstat st; -+ struct dbgaufs_arg *p; -+ -+ err = -ENOMEM; -+ p = kmalloc(sizeof(*p), GFP_NOFS); -+ if (unlikely(!p)) -+ goto out; -+ -+ err = 0; -+ p->n = 0; -+ file->private_data = p; -+ if (!xf) -+ goto out; -+ -+ err = vfsub_getattr(&xf->f_path, &st); -+ if (!err) { -+ if (do_fcnt) -+ p->n = snprintf -+ (p->a, sizeof(p->a), "%d, %llux%u %lld\n", -+ cnt, st.blocks, st.blksize, -+ (long long)st.size); -+ else -+ p->n = snprintf(p->a, sizeof(p->a), "%llux%u %lld\n", -+ st.blocks, st.blksize, -+ (long long)st.size); -+ AuDebugOn(p->n >= sizeof(p->a)); -+ } else { -+ p->n = snprintf(p->a, sizeof(p->a), "err %d\n", err); -+ err = 0; -+ } -+ -+out: -+ return err; -+} -+ -+static ssize_t dbgaufs_xi_read(struct file *file, char __user *buf, -+ size_t count, loff_t *ppos) -+{ -+ struct dbgaufs_arg *p; -+ -+ p = file->private_data; -+ return simple_read_from_buffer(buf, count, ppos, p->a, p->n); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct dbgaufs_plink_arg { -+ int n; -+ char a[]; -+}; -+ -+static int dbgaufs_plink_release(struct inode *inode __maybe_unused, -+ struct file *file) -+{ -+ free_page((unsigned long)file->private_data); -+ return 0; -+} -+ -+static int dbgaufs_plink_open(struct inode *inode, struct file *file) -+{ -+ int err, i, limit; -+ unsigned long n, sum; -+ struct dbgaufs_plink_arg *p; -+ struct au_sbinfo *sbinfo; -+ struct super_block *sb; -+ struct hlist_bl_head *hbl; -+ -+ err = -ENOMEM; -+ p = (void *)get_zeroed_page(GFP_NOFS); -+ if (unlikely(!p)) -+ goto out; -+ -+ err = -EFBIG; -+ sbinfo = inode->i_private; -+ sb = sbinfo->si_sb; -+ si_noflush_read_lock(sb); -+ if (au_opt_test(au_mntflags(sb), PLINK)) { -+ limit = PAGE_SIZE - sizeof(p->n); -+ -+ /* the number of buckets */ -+ n = snprintf(p->a + p->n, limit, "%d\n", AuPlink_NHASH); -+ p->n += n; -+ limit -= n; -+ -+ sum = 0; -+ for (i = 0, hbl = sbinfo->si_plink; i < AuPlink_NHASH; -+ i++, hbl++) { -+ n = au_hbl_count(hbl); -+ sum += n; -+ -+ n = snprintf(p->a + p->n, limit, "%lu ", n); -+ p->n += n; -+ limit -= n; -+ if (unlikely(limit <= 0)) -+ goto out_free; -+ } -+ p->a[p->n - 1] = '\n'; -+ -+ /* the sum of plinks */ -+ n = snprintf(p->a + p->n, limit, "%lu\n", sum); -+ p->n += n; -+ limit -= n; -+ if (unlikely(limit <= 0)) -+ goto out_free; -+ } else { -+#define str "1\n0\n0\n" -+ p->n = sizeof(str) - 1; -+ strcpy(p->a, str); -+#undef str -+ } -+ si_read_unlock(sb); -+ -+ err = 0; -+ file->private_data = p; -+ goto out; /* success */ -+ -+out_free: -+ free_page((unsigned long)p); -+out: -+ return err; -+} -+ -+static ssize_t dbgaufs_plink_read(struct file *file, char __user *buf, -+ size_t count, loff_t *ppos) -+{ -+ struct dbgaufs_plink_arg *p; -+ -+ p = file->private_data; -+ return simple_read_from_buffer(buf, count, ppos, p->a, p->n); -+} -+ -+static const struct file_operations dbgaufs_plink_fop = { -+ .owner = THIS_MODULE, -+ .open = dbgaufs_plink_open, -+ .release = dbgaufs_plink_release, -+ .read = dbgaufs_plink_read -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int dbgaufs_xib_open(struct inode *inode, struct file *file) -+{ -+ int err; -+ struct au_sbinfo *sbinfo; -+ struct super_block *sb; -+ -+ sbinfo = inode->i_private; -+ sb = sbinfo->si_sb; -+ si_noflush_read_lock(sb); -+ err = dbgaufs_xi_open(sbinfo->si_xib, file, /*do_fcnt*/0, /*cnt*/0); -+ si_read_unlock(sb); -+ return err; -+} -+ -+static const struct file_operations dbgaufs_xib_fop = { -+ .owner = THIS_MODULE, -+ .open = dbgaufs_xib_open, -+ .release = dbgaufs_xi_release, -+ .read = dbgaufs_xi_read -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+#define DbgaufsXi_PREFIX "xi" -+ -+static int dbgaufs_xino_open(struct inode *inode, struct file *file) -+{ -+ int err, idx; -+ long l; -+ aufs_bindex_t bindex; -+ char *p, a[sizeof(DbgaufsXi_PREFIX) + 8]; -+ struct au_sbinfo *sbinfo; -+ struct super_block *sb; -+ struct au_xino *xi; -+ struct file *xf; -+ struct qstr *name; -+ struct au_branch *br; -+ -+ err = -ENOENT; -+ name = &file->f_path.dentry->d_name; -+ if (unlikely(name->len < sizeof(DbgaufsXi_PREFIX) -+ || memcmp(name->name, DbgaufsXi_PREFIX, -+ sizeof(DbgaufsXi_PREFIX) - 1))) -+ goto out; -+ -+ AuDebugOn(name->len >= sizeof(a)); -+ memcpy(a, name->name, name->len); -+ a[name->len] = '\0'; -+ p = strchr(a, '-'); -+ if (p) -+ *p = '\0'; -+ err = kstrtol(a + sizeof(DbgaufsXi_PREFIX) - 1, 10, &l); -+ if (unlikely(err)) -+ goto out; -+ bindex = l; -+ idx = 0; -+ if (p) { -+ err = kstrtol(p + 1, 10, &l); -+ if (unlikely(err)) -+ goto out; -+ idx = l; -+ } -+ -+ err = -ENOENT; -+ sbinfo = inode->i_private; -+ sb = sbinfo->si_sb; -+ si_noflush_read_lock(sb); -+ if (unlikely(bindex < 0 || bindex > au_sbbot(sb))) -+ goto out_si; -+ br = au_sbr(sb, bindex); -+ xi = br->br_xino; -+ if (unlikely(idx >= xi->xi_nfile)) -+ goto out_si; -+ xf = au_xino_file(xi, idx); -+ if (xf) -+ err = dbgaufs_xi_open(xf, file, /*do_fcnt*/1, -+ au_xino_count(br)); -+ -+out_si: -+ si_read_unlock(sb); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+static const struct file_operations dbgaufs_xino_fop = { -+ .owner = THIS_MODULE, -+ .open = dbgaufs_xino_open, -+ .release = dbgaufs_xi_release, -+ .read = dbgaufs_xi_read -+}; -+ -+void dbgaufs_xino_del(struct au_branch *br) -+{ -+ struct dentry *dbgaufs; -+ -+ dbgaufs = br->br_dbgaufs; -+ if (!dbgaufs) -+ return; -+ -+ br->br_dbgaufs = NULL; -+ /* debugfs acquires the parent i_mutex */ -+ lockdep_off(); -+ debugfs_remove(dbgaufs); -+ lockdep_on(); -+} -+ -+void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex) -+{ -+ aufs_bindex_t bbot; -+ struct au_branch *br; -+ -+ if (!au_sbi(sb)->si_dbgaufs) -+ return; -+ -+ bbot = au_sbbot(sb); -+ for (; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ dbgaufs_xino_del(br); -+ } -+} -+ -+static void dbgaufs_br_do_add(struct super_block *sb, aufs_bindex_t bindex, -+ unsigned int idx, struct dentry *parent, -+ struct au_sbinfo *sbinfo) -+{ -+ struct au_branch *br; -+ struct dentry *d; -+ /* "xi" bindex(5) "-" idx(2) NULL */ -+ char name[sizeof(DbgaufsXi_PREFIX) + 8]; -+ -+ if (!idx) -+ snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d", bindex); -+ else -+ snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d-%u", -+ bindex, idx); -+ br = au_sbr(sb, bindex); -+ if (br->br_dbgaufs) { -+ struct qstr qstr = QSTR_INIT(name, strlen(name)); -+ -+ if (!au_qstreq(&br->br_dbgaufs->d_name, &qstr)) { -+ /* debugfs acquires the parent i_mutex */ -+ lockdep_off(); -+ d = debugfs_rename(parent, br->br_dbgaufs, parent, -+ name); -+ lockdep_on(); -+ if (unlikely(!d)) -+ pr_warn("failed renaming %pd/%s, ignored.\n", -+ parent, name); -+ } -+ } else { -+ lockdep_off(); -+ br->br_dbgaufs = debugfs_create_file(name, dbgaufs_mode, parent, -+ sbinfo, &dbgaufs_xino_fop); -+ lockdep_on(); -+ if (unlikely(!br->br_dbgaufs)) -+ pr_warn("failed creating %pd/%s, ignored.\n", -+ parent, name); -+ } -+} -+ -+static void dbgaufs_br_add(struct super_block *sb, aufs_bindex_t bindex, -+ struct dentry *parent, struct au_sbinfo *sbinfo) -+{ -+ struct au_branch *br; -+ struct au_xino *xi; -+ unsigned int u; -+ -+ br = au_sbr(sb, bindex); -+ xi = br->br_xino; -+ for (u = 0; u < xi->xi_nfile; u++) -+ dbgaufs_br_do_add(sb, bindex, u, parent, sbinfo); -+} -+ -+void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex, int topdown) -+{ -+ struct au_sbinfo *sbinfo; -+ struct dentry *parent; -+ aufs_bindex_t bbot; -+ -+ if (!au_opt_test(au_mntflags(sb), XINO)) -+ return; -+ -+ sbinfo = au_sbi(sb); -+ parent = sbinfo->si_dbgaufs; -+ if (!parent) -+ return; -+ -+ bbot = au_sbbot(sb); -+ if (topdown) -+ for (; bindex <= bbot; bindex++) -+ dbgaufs_br_add(sb, bindex, parent, sbinfo); -+ else -+ for (; bbot >= bindex; bbot--) -+ dbgaufs_br_add(sb, bbot, parent, sbinfo); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+#ifdef CONFIG_AUFS_EXPORT -+static int dbgaufs_xigen_open(struct inode *inode, struct file *file) -+{ -+ int err; -+ struct au_sbinfo *sbinfo; -+ struct super_block *sb; -+ -+ sbinfo = inode->i_private; -+ sb = sbinfo->si_sb; -+ si_noflush_read_lock(sb); -+ err = dbgaufs_xi_open(sbinfo->si_xigen, file, /*do_fcnt*/0, /*cnt*/0); -+ si_read_unlock(sb); -+ return err; -+} -+ -+static const struct file_operations dbgaufs_xigen_fop = { -+ .owner = THIS_MODULE, -+ .open = dbgaufs_xigen_open, -+ .release = dbgaufs_xi_release, -+ .read = dbgaufs_xi_read -+}; -+ -+static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo) -+{ -+ int err; -+ -+ /* -+ * This function is a dynamic '__init' function actually, -+ * so the tiny check for si_rwsem is unnecessary. -+ */ -+ /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ -+ -+ err = -EIO; -+ sbinfo->si_dbgaufs_xigen = debugfs_create_file -+ ("xigen", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo, -+ &dbgaufs_xigen_fop); -+ if (sbinfo->si_dbgaufs_xigen) -+ err = 0; -+ -+ return err; -+} -+#else -+static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo) -+{ -+ return 0; -+} -+#endif /* CONFIG_AUFS_EXPORT */ -+ -+/* ---------------------------------------------------------------------- */ -+ -+void dbgaufs_si_fin(struct au_sbinfo *sbinfo) -+{ -+ /* -+ * This function is a dynamic '__fin' function actually, -+ * so the tiny check for si_rwsem is unnecessary. -+ */ -+ /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ -+ -+ debugfs_remove_recursive(sbinfo->si_dbgaufs); -+ sbinfo->si_dbgaufs = NULL; -+} -+ -+int dbgaufs_si_init(struct au_sbinfo *sbinfo) -+{ -+ int err; -+ char name[SysaufsSiNameLen]; -+ -+ /* -+ * This function is a dynamic '__init' function actually, -+ * so the tiny check for si_rwsem is unnecessary. -+ */ -+ /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ -+ -+ err = -ENOENT; -+ if (!dbgaufs) { -+ AuErr1("/debug/aufs is uninitialized\n"); -+ goto out; -+ } -+ -+ err = -EIO; -+ sysaufs_name(sbinfo, name); -+ sbinfo->si_dbgaufs = debugfs_create_dir(name, dbgaufs); -+ if (unlikely(!sbinfo->si_dbgaufs)) -+ goto out; -+ -+ /* regardless plink/noplink option */ -+ sbinfo->si_dbgaufs_plink = debugfs_create_file -+ ("plink", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo, -+ &dbgaufs_plink_fop); -+ if (unlikely(!sbinfo->si_dbgaufs_plink)) -+ goto out_dir; -+ -+ /* regardless xino/noxino option */ -+ sbinfo->si_dbgaufs_xib = debugfs_create_file -+ ("xib", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo, -+ &dbgaufs_xib_fop); -+ if (unlikely(!sbinfo->si_dbgaufs_xib)) -+ goto out_dir; -+ -+ err = dbgaufs_xigen_init(sbinfo); -+ if (!err) -+ goto out; /* success */ -+ -+out_dir: -+ dbgaufs_si_fin(sbinfo); -+out: -+ if (unlikely(err)) -+ pr_err("debugfs/aufs failed\n"); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+void dbgaufs_fin(void) -+{ -+ debugfs_remove(dbgaufs); -+} -+ -+int __init dbgaufs_init(void) -+{ -+ int err; -+ -+ err = -EIO; -+ dbgaufs = debugfs_create_dir(AUFS_NAME, NULL); -+ if (dbgaufs) -+ err = 0; -+ return err; -+} -diff --git a/fs/aufs/dbgaufs.h b/fs/aufs/dbgaufs.h -new file mode 100644 -index 000000000000..1ea241bf0234 ---- /dev/null -+++ b/fs/aufs/dbgaufs.h -@@ -0,0 +1,53 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * debugfs interface -+ */ -+ -+#ifndef __DBGAUFS_H__ -+#define __DBGAUFS_H__ -+ -+#ifdef __KERNEL__ -+ -+struct super_block; -+struct au_sbinfo; -+struct au_branch; -+ -+#ifdef CONFIG_DEBUG_FS -+/* dbgaufs.c */ -+void dbgaufs_xino_del(struct au_branch *br); -+void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex); -+void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex, int topdown); -+void dbgaufs_si_fin(struct au_sbinfo *sbinfo); -+int dbgaufs_si_init(struct au_sbinfo *sbinfo); -+void dbgaufs_fin(void); -+int __init dbgaufs_init(void); -+#else -+AuStubVoid(dbgaufs_xino_del, struct au_branch *br) -+AuStubVoid(dbgaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex) -+AuStubVoid(dbgaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex, -+ int topdown) -+AuStubVoid(dbgaufs_si_fin, struct au_sbinfo *sbinfo) -+AuStubInt0(dbgaufs_si_init, struct au_sbinfo *sbinfo) -+AuStubVoid(dbgaufs_fin, void) -+AuStubInt0(__init dbgaufs_init, void) -+#endif /* CONFIG_DEBUG_FS */ -+ -+#endif /* __KERNEL__ */ -+#endif /* __DBGAUFS_H__ */ -diff --git a/fs/aufs/dcsub.c b/fs/aufs/dcsub.c -new file mode 100644 -index 000000000000..0b9122307667 ---- /dev/null -+++ b/fs/aufs/dcsub.c -@@ -0,0 +1,225 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * sub-routines for dentry cache -+ */ -+ -+#include "aufs.h" -+ -+static void au_dpage_free(struct au_dpage *dpage) -+{ -+ int i; -+ struct dentry **p; -+ -+ p = dpage->dentries; -+ for (i = 0; i < dpage->ndentry; i++) -+ dput(*p++); -+ free_page((unsigned long)dpage->dentries); -+} -+ -+int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp) -+{ -+ int err; -+ void *p; -+ -+ err = -ENOMEM; -+ dpages->dpages = kmalloc(sizeof(*dpages->dpages), gfp); -+ if (unlikely(!dpages->dpages)) -+ goto out; -+ -+ p = (void *)__get_free_page(gfp); -+ if (unlikely(!p)) -+ goto out_dpages; -+ -+ dpages->dpages[0].ndentry = 0; -+ dpages->dpages[0].dentries = p; -+ dpages->ndpage = 1; -+ return 0; /* success */ -+ -+out_dpages: -+ au_kfree_try_rcu(dpages->dpages); -+out: -+ return err; -+} -+ -+void au_dpages_free(struct au_dcsub_pages *dpages) -+{ -+ int i; -+ struct au_dpage *p; -+ -+ p = dpages->dpages; -+ for (i = 0; i < dpages->ndpage; i++) -+ au_dpage_free(p++); -+ au_kfree_try_rcu(dpages->dpages); -+} -+ -+static int au_dpages_append(struct au_dcsub_pages *dpages, -+ struct dentry *dentry, gfp_t gfp) -+{ -+ int err, sz; -+ struct au_dpage *dpage; -+ void *p; -+ -+ dpage = dpages->dpages + dpages->ndpage - 1; -+ sz = PAGE_SIZE / sizeof(dentry); -+ if (unlikely(dpage->ndentry >= sz)) { -+ AuLabel(new dpage); -+ err = -ENOMEM; -+ sz = dpages->ndpage * sizeof(*dpages->dpages); -+ p = au_kzrealloc(dpages->dpages, sz, -+ sz + sizeof(*dpages->dpages), gfp, -+ /*may_shrink*/0); -+ if (unlikely(!p)) -+ goto out; -+ -+ dpages->dpages = p; -+ dpage = dpages->dpages + dpages->ndpage; -+ p = (void *)__get_free_page(gfp); -+ if (unlikely(!p)) -+ goto out; -+ -+ dpage->ndentry = 0; -+ dpage->dentries = p; -+ dpages->ndpage++; -+ } -+ -+ AuDebugOn(au_dcount(dentry) <= 0); -+ dpage->dentries[dpage->ndentry++] = dget_dlock(dentry); -+ return 0; /* success */ -+ -+out: -+ return err; -+} -+ -+/* todo: BAD approach */ -+/* copied from linux/fs/dcache.c */ -+enum d_walk_ret { -+ D_WALK_CONTINUE, -+ D_WALK_QUIT, -+ D_WALK_NORETRY, -+ D_WALK_SKIP, -+}; -+ -+extern void d_walk(struct dentry *parent, void *data, -+ enum d_walk_ret (*enter)(void *, struct dentry *)); -+ -+struct ac_dpages_arg { -+ int err; -+ struct au_dcsub_pages *dpages; -+ struct super_block *sb; -+ au_dpages_test test; -+ void *arg; -+}; -+ -+static enum d_walk_ret au_call_dpages_append(void *_arg, struct dentry *dentry) -+{ -+ enum d_walk_ret ret; -+ struct ac_dpages_arg *arg = _arg; -+ -+ ret = D_WALK_CONTINUE; -+ if (dentry->d_sb == arg->sb -+ && !IS_ROOT(dentry) -+ && au_dcount(dentry) > 0 -+ && au_di(dentry) -+ && (!arg->test || arg->test(dentry, arg->arg))) { -+ arg->err = au_dpages_append(arg->dpages, dentry, GFP_ATOMIC); -+ if (unlikely(arg->err)) -+ ret = D_WALK_QUIT; -+ } -+ -+ return ret; -+} -+ -+int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root, -+ au_dpages_test test, void *arg) -+{ -+ struct ac_dpages_arg args = { -+ .err = 0, -+ .dpages = dpages, -+ .sb = root->d_sb, -+ .test = test, -+ .arg = arg -+ }; -+ -+ d_walk(root, &args, au_call_dpages_append); -+ -+ return args.err; -+} -+ -+int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry, -+ int do_include, au_dpages_test test, void *arg) -+{ -+ int err; -+ -+ err = 0; -+ write_seqlock(&rename_lock); -+ spin_lock(&dentry->d_lock); -+ if (do_include -+ && au_dcount(dentry) > 0 -+ && (!test || test(dentry, arg))) -+ err = au_dpages_append(dpages, dentry, GFP_ATOMIC); -+ spin_unlock(&dentry->d_lock); -+ if (unlikely(err)) -+ goto out; -+ -+ /* -+ * RCU for vfsmount is unnecessary since this is a traverse in a single -+ * mount -+ */ -+ while (!IS_ROOT(dentry)) { -+ dentry = dentry->d_parent; /* rename_lock is locked */ -+ spin_lock(&dentry->d_lock); -+ if (au_dcount(dentry) > 0 -+ && (!test || test(dentry, arg))) -+ err = au_dpages_append(dpages, dentry, GFP_ATOMIC); -+ spin_unlock(&dentry->d_lock); -+ if (unlikely(err)) -+ break; -+ } -+ -+out: -+ write_sequnlock(&rename_lock); -+ return err; -+} -+ -+static inline int au_dcsub_dpages_aufs(struct dentry *dentry, void *arg) -+{ -+ return au_di(dentry) && dentry->d_sb == arg; -+} -+ -+int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages, -+ struct dentry *dentry, int do_include) -+{ -+ return au_dcsub_pages_rev(dpages, dentry, do_include, -+ au_dcsub_dpages_aufs, dentry->d_sb); -+} -+ -+int au_test_subdir(struct dentry *d1, struct dentry *d2) -+{ -+ struct path path[2] = { -+ { -+ .dentry = d1 -+ }, -+ { -+ .dentry = d2 -+ } -+ }; -+ -+ return path_is_under(path + 0, path + 1); -+} -diff --git a/fs/aufs/dcsub.h b/fs/aufs/dcsub.h -new file mode 100644 -index 000000000000..5e578995c256 ---- /dev/null -+++ b/fs/aufs/dcsub.h -@@ -0,0 +1,137 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * sub-routines for dentry cache -+ */ -+ -+#ifndef __AUFS_DCSUB_H__ -+#define __AUFS_DCSUB_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/dcache.h> -+#include <linux/fs.h> -+ -+struct au_dpage { -+ int ndentry; -+ struct dentry **dentries; -+}; -+ -+struct au_dcsub_pages { -+ int ndpage; -+ struct au_dpage *dpages; -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* dcsub.c */ -+int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp); -+void au_dpages_free(struct au_dcsub_pages *dpages); -+typedef int (*au_dpages_test)(struct dentry *dentry, void *arg); -+int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root, -+ au_dpages_test test, void *arg); -+int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry, -+ int do_include, au_dpages_test test, void *arg); -+int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages, -+ struct dentry *dentry, int do_include); -+int au_test_subdir(struct dentry *d1, struct dentry *d2); -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * todo: in linux-3.13, several similar (but faster) helpers are added to -+ * include/linux/dcache.h. Try them (in the future). -+ */ -+ -+static inline int au_d_hashed_positive(struct dentry *d) -+{ -+ int err; -+ struct inode *inode = d_inode(d); -+ -+ err = 0; -+ if (unlikely(d_unhashed(d) -+ || d_is_negative(d) -+ || !inode->i_nlink)) -+ err = -ENOENT; -+ return err; -+} -+ -+static inline int au_d_linkable(struct dentry *d) -+{ -+ int err; -+ struct inode *inode = d_inode(d); -+ -+ err = au_d_hashed_positive(d); -+ if (err -+ && d_is_positive(d) -+ && (inode->i_state & I_LINKABLE)) -+ err = 0; -+ return err; -+} -+ -+static inline int au_d_alive(struct dentry *d) -+{ -+ int err; -+ struct inode *inode; -+ -+ err = 0; -+ if (!IS_ROOT(d)) -+ err = au_d_hashed_positive(d); -+ else { -+ inode = d_inode(d); -+ if (unlikely(d_unlinked(d) -+ || d_is_negative(d) -+ || !inode->i_nlink)) -+ err = -ENOENT; -+ } -+ return err; -+} -+ -+static inline int au_alive_dir(struct dentry *d) -+{ -+ int err; -+ -+ err = au_d_alive(d); -+ if (unlikely(err || IS_DEADDIR(d_inode(d)))) -+ err = -ENOENT; -+ return err; -+} -+ -+static inline int au_qstreq(struct qstr *a, struct qstr *b) -+{ -+ return a->len == b->len -+ && !memcmp(a->name, b->name, a->len); -+} -+ -+/* -+ * by the commit -+ * 360f547 2015-01-25 dcache: let the dentry count go down to zero without -+ * taking d_lock -+ * the type of d_lockref.count became int, but the inlined function d_count() -+ * still returns unsigned int. -+ * I don't know why. Maybe it is for every d_count() users? -+ * Anyway au_dcount() lives on. -+ */ -+static inline int au_dcount(struct dentry *d) -+{ -+ return (int)d_count(d); -+} -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_DCSUB_H__ */ -diff --git a/fs/aufs/debug.c b/fs/aufs/debug.c -new file mode 100644 -index 000000000000..b93bb4f565bf ---- /dev/null -+++ b/fs/aufs/debug.c -@@ -0,0 +1,441 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * debug print functions -+ */ -+ -+#include <linux/iversion.h> -+#include "aufs.h" -+ -+/* Returns 0, or -errno. arg is in kp->arg. */ -+static int param_atomic_t_set(const char *val, const struct kernel_param *kp) -+{ -+ int err, n; -+ -+ err = kstrtoint(val, 0, &n); -+ if (!err) { -+ if (n > 0) -+ au_debug_on(); -+ else -+ au_debug_off(); -+ } -+ return err; -+} -+ -+/* Returns length written or -errno. Buffer is 4k (ie. be short!) */ -+static int param_atomic_t_get(char *buffer, const struct kernel_param *kp) -+{ -+ atomic_t *a; -+ -+ a = kp->arg; -+ return sprintf(buffer, "%d", atomic_read(a)); -+} -+ -+static struct kernel_param_ops param_ops_atomic_t = { -+ .set = param_atomic_t_set, -+ .get = param_atomic_t_get -+ /* void (*free)(void *arg) */ -+}; -+ -+atomic_t aufs_debug = ATOMIC_INIT(0); -+MODULE_PARM_DESC(debug, "debug print"); -+module_param_named(debug, aufs_debug, atomic_t, 0664); -+ -+DEFINE_MUTEX(au_dbg_mtx); /* just to serialize the dbg msgs */ -+char *au_plevel = KERN_DEBUG; -+#define dpri(fmt, ...) do { \ -+ if ((au_plevel \ -+ && strcmp(au_plevel, KERN_DEBUG)) \ -+ || au_debug_test()) \ -+ printk("%s" fmt, au_plevel, ##__VA_ARGS__); \ -+} while (0) -+ -+/* ---------------------------------------------------------------------- */ -+ -+void au_dpri_whlist(struct au_nhash *whlist) -+{ -+ unsigned long ul, n; -+ struct hlist_head *head; -+ struct au_vdir_wh *pos; -+ -+ n = whlist->nh_num; -+ head = whlist->nh_head; -+ for (ul = 0; ul < n; ul++) { -+ hlist_for_each_entry(pos, head, wh_hash) -+ dpri("b%d, %.*s, %d\n", -+ pos->wh_bindex, -+ pos->wh_str.len, pos->wh_str.name, -+ pos->wh_str.len); -+ head++; -+ } -+} -+ -+void au_dpri_vdir(struct au_vdir *vdir) -+{ -+ unsigned long ul; -+ union au_vdir_deblk_p p; -+ unsigned char *o; -+ -+ if (!vdir || IS_ERR(vdir)) { -+ dpri("err %ld\n", PTR_ERR(vdir)); -+ return; -+ } -+ -+ dpri("deblk %u, nblk %lu, deblk %p, last{%lu, %p}, ver %llu\n", -+ vdir->vd_deblk_sz, vdir->vd_nblk, vdir->vd_deblk, -+ vdir->vd_last.ul, vdir->vd_last.p.deblk, vdir->vd_version); -+ for (ul = 0; ul < vdir->vd_nblk; ul++) { -+ p.deblk = vdir->vd_deblk[ul]; -+ o = p.deblk; -+ dpri("[%lu]: %p\n", ul, o); -+ } -+} -+ -+static int do_pri_inode(aufs_bindex_t bindex, struct inode *inode, int hn, -+ struct dentry *wh) -+{ -+ char *n = NULL; -+ int l = 0; -+ -+ if (!inode || IS_ERR(inode)) { -+ dpri("i%d: err %ld\n", bindex, PTR_ERR(inode)); -+ return -1; -+ } -+ -+ /* the type of i_blocks depends upon CONFIG_LBDAF */ -+ BUILD_BUG_ON(sizeof(inode->i_blocks) != sizeof(unsigned long) -+ && sizeof(inode->i_blocks) != sizeof(u64)); -+ if (wh) { -+ n = (void *)wh->d_name.name; -+ l = wh->d_name.len; -+ } -+ -+ dpri("i%d: %p, i%lu, %s, cnt %d, nl %u, 0%o, sz %llu, blk %llu," -+ " hn %d, ct %lld, np %lu, st 0x%lx, f 0x%x, v %llu, g %x%s%.*s\n", -+ bindex, inode, -+ inode->i_ino, inode->i_sb ? au_sbtype(inode->i_sb) : "??", -+ atomic_read(&inode->i_count), inode->i_nlink, inode->i_mode, -+ i_size_read(inode), (unsigned long long)inode->i_blocks, -+ hn, (long long)timespec64_to_ns(&inode->i_ctime) & 0x0ffff, -+ inode->i_mapping ? inode->i_mapping->nrpages : 0, -+ inode->i_state, inode->i_flags, inode_peek_iversion(inode), -+ inode->i_generation, -+ l ? ", wh " : "", l, n); -+ return 0; -+} -+ -+void au_dpri_inode(struct inode *inode) -+{ -+ struct au_iinfo *iinfo; -+ struct au_hinode *hi; -+ aufs_bindex_t bindex; -+ int err, hn; -+ -+ err = do_pri_inode(-1, inode, -1, NULL); -+ if (err || !au_test_aufs(inode->i_sb) || au_is_bad_inode(inode)) -+ return; -+ -+ iinfo = au_ii(inode); -+ dpri("i-1: btop %d, bbot %d, gen %d\n", -+ iinfo->ii_btop, iinfo->ii_bbot, au_iigen(inode, NULL)); -+ if (iinfo->ii_btop < 0) -+ return; -+ hn = 0; -+ for (bindex = iinfo->ii_btop; bindex <= iinfo->ii_bbot; bindex++) { -+ hi = au_hinode(iinfo, bindex); -+ hn = !!au_hn(hi); -+ do_pri_inode(bindex, hi->hi_inode, hn, hi->hi_whdentry); -+ } -+} -+ -+void au_dpri_dalias(struct inode *inode) -+{ -+ struct dentry *d; -+ -+ spin_lock(&inode->i_lock); -+ hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias) -+ au_dpri_dentry(d); -+ spin_unlock(&inode->i_lock); -+} -+ -+static int do_pri_dentry(aufs_bindex_t bindex, struct dentry *dentry) -+{ -+ struct dentry *wh = NULL; -+ int hn; -+ struct inode *inode; -+ struct au_iinfo *iinfo; -+ struct au_hinode *hi; -+ -+ if (!dentry || IS_ERR(dentry)) { -+ dpri("d%d: err %ld\n", bindex, PTR_ERR(dentry)); -+ return -1; -+ } -+ /* do not call dget_parent() here */ -+ /* note: access d_xxx without d_lock */ -+ dpri("d%d: %p, %pd2?, %s, cnt %d, flags 0x%x, %shashed\n", -+ bindex, dentry, dentry, -+ dentry->d_sb ? au_sbtype(dentry->d_sb) : "??", -+ au_dcount(dentry), dentry->d_flags, -+ d_unhashed(dentry) ? "un" : ""); -+ hn = -1; -+ inode = NULL; -+ if (d_is_positive(dentry)) -+ inode = d_inode(dentry); -+ if (inode -+ && au_test_aufs(dentry->d_sb) -+ && bindex >= 0 -+ && !au_is_bad_inode(inode)) { -+ iinfo = au_ii(inode); -+ hi = au_hinode(iinfo, bindex); -+ hn = !!au_hn(hi); -+ wh = hi->hi_whdentry; -+ } -+ do_pri_inode(bindex, inode, hn, wh); -+ return 0; -+} -+ -+void au_dpri_dentry(struct dentry *dentry) -+{ -+ struct au_dinfo *dinfo; -+ aufs_bindex_t bindex; -+ int err; -+ -+ err = do_pri_dentry(-1, dentry); -+ if (err || !au_test_aufs(dentry->d_sb)) -+ return; -+ -+ dinfo = au_di(dentry); -+ if (!dinfo) -+ return; -+ dpri("d-1: btop %d, bbot %d, bwh %d, bdiropq %d, gen %d, tmp %d\n", -+ dinfo->di_btop, dinfo->di_bbot, -+ dinfo->di_bwh, dinfo->di_bdiropq, au_digen(dentry), -+ dinfo->di_tmpfile); -+ if (dinfo->di_btop < 0) -+ return; -+ for (bindex = dinfo->di_btop; bindex <= dinfo->di_bbot; bindex++) -+ do_pri_dentry(bindex, au_hdentry(dinfo, bindex)->hd_dentry); -+} -+ -+static int do_pri_file(aufs_bindex_t bindex, struct file *file) -+{ -+ char a[32]; -+ -+ if (!file || IS_ERR(file)) { -+ dpri("f%d: err %ld\n", bindex, PTR_ERR(file)); -+ return -1; -+ } -+ a[0] = 0; -+ if (bindex < 0 -+ && !IS_ERR_OR_NULL(file->f_path.dentry) -+ && au_test_aufs(file->f_path.dentry->d_sb) -+ && au_fi(file)) -+ snprintf(a, sizeof(a), ", gen %d, mmapped %d", -+ au_figen(file), atomic_read(&au_fi(file)->fi_mmapped)); -+ dpri("f%d: mode 0x%x, flags 0%o, cnt %ld, v %llu, pos %llu%s\n", -+ bindex, file->f_mode, file->f_flags, (long)file_count(file), -+ file->f_version, file->f_pos, a); -+ if (!IS_ERR_OR_NULL(file->f_path.dentry)) -+ do_pri_dentry(bindex, file->f_path.dentry); -+ return 0; -+} -+ -+void au_dpri_file(struct file *file) -+{ -+ struct au_finfo *finfo; -+ struct au_fidir *fidir; -+ struct au_hfile *hfile; -+ aufs_bindex_t bindex; -+ int err; -+ -+ err = do_pri_file(-1, file); -+ if (err -+ || IS_ERR_OR_NULL(file->f_path.dentry) -+ || !au_test_aufs(file->f_path.dentry->d_sb)) -+ return; -+ -+ finfo = au_fi(file); -+ if (!finfo) -+ return; -+ if (finfo->fi_btop < 0) -+ return; -+ fidir = finfo->fi_hdir; -+ if (!fidir) -+ do_pri_file(finfo->fi_btop, finfo->fi_htop.hf_file); -+ else -+ for (bindex = finfo->fi_btop; -+ bindex >= 0 && bindex <= fidir->fd_bbot; -+ bindex++) { -+ hfile = fidir->fd_hfile + bindex; -+ do_pri_file(bindex, hfile ? hfile->hf_file : NULL); -+ } -+} -+ -+static int do_pri_br(aufs_bindex_t bindex, struct au_branch *br) -+{ -+ struct vfsmount *mnt; -+ struct super_block *sb; -+ -+ if (!br || IS_ERR(br)) -+ goto out; -+ mnt = au_br_mnt(br); -+ if (!mnt || IS_ERR(mnt)) -+ goto out; -+ sb = mnt->mnt_sb; -+ if (!sb || IS_ERR(sb)) -+ goto out; -+ -+ dpri("s%d: {perm 0x%x, id %d, wbr %p}, " -+ "%s, dev 0x%02x%02x, flags 0x%lx, cnt %d, active %d, " -+ "xino %d\n", -+ bindex, br->br_perm, br->br_id, br->br_wbr, -+ au_sbtype(sb), MAJOR(sb->s_dev), MINOR(sb->s_dev), -+ sb->s_flags, sb->s_count, -+ atomic_read(&sb->s_active), -+ !!au_xino_file(br->br_xino, /*idx*/-1)); -+ return 0; -+ -+out: -+ dpri("s%d: err %ld\n", bindex, PTR_ERR(br)); -+ return -1; -+} -+ -+void au_dpri_sb(struct super_block *sb) -+{ -+ struct au_sbinfo *sbinfo; -+ aufs_bindex_t bindex; -+ int err; -+ /* to reduce stack size */ -+ struct { -+ struct vfsmount mnt; -+ struct au_branch fake; -+ } *a; -+ -+ /* this function can be called from magic sysrq */ -+ a = kzalloc(sizeof(*a), GFP_ATOMIC); -+ if (unlikely(!a)) { -+ dpri("no memory\n"); -+ return; -+ } -+ -+ a->mnt.mnt_sb = sb; -+ a->fake.br_path.mnt = &a->mnt; -+ err = do_pri_br(-1, &a->fake); -+ au_kfree_rcu(a); -+ dpri("dev 0x%x\n", sb->s_dev); -+ if (err || !au_test_aufs(sb)) -+ return; -+ -+ sbinfo = au_sbi(sb); -+ if (!sbinfo) -+ return; -+ dpri("nw %d, gen %u, kobj %d\n", -+ atomic_read(&sbinfo->si_nowait.nw_len), sbinfo->si_generation, -+ kref_read(&sbinfo->si_kobj.kref)); -+ for (bindex = 0; bindex <= sbinfo->si_bbot; bindex++) -+ do_pri_br(bindex, sbinfo->si_branch[0 + bindex]); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line) -+{ -+ struct inode *h_inode, *inode = d_inode(dentry); -+ struct dentry *h_dentry; -+ aufs_bindex_t bindex, bbot, bi; -+ -+ if (!inode /* || au_di(dentry)->di_lsc == AuLsc_DI_TMP */) -+ return; -+ -+ bbot = au_dbbot(dentry); -+ bi = au_ibbot(inode); -+ if (bi < bbot) -+ bbot = bi; -+ bindex = au_dbtop(dentry); -+ bi = au_ibtop(inode); -+ if (bi > bindex) -+ bindex = bi; -+ -+ for (; bindex <= bbot; bindex++) { -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (!h_dentry) -+ continue; -+ h_inode = au_h_iptr(inode, bindex); -+ if (unlikely(h_inode != d_inode(h_dentry))) { -+ au_debug_on(); -+ AuDbg("b%d, %s:%d\n", bindex, func, line); -+ AuDbgDentry(dentry); -+ AuDbgInode(inode); -+ au_debug_off(); -+ BUG(); -+ } -+ } -+} -+ -+void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen) -+{ -+ int err, i, j; -+ struct au_dcsub_pages dpages; -+ struct au_dpage *dpage; -+ struct dentry **dentries; -+ -+ err = au_dpages_init(&dpages, GFP_NOFS); -+ AuDebugOn(err); -+ err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/1); -+ AuDebugOn(err); -+ for (i = dpages.ndpage - 1; !err && i >= 0; i--) { -+ dpage = dpages.dpages + i; -+ dentries = dpage->dentries; -+ for (j = dpage->ndentry - 1; !err && j >= 0; j--) -+ AuDebugOn(au_digen_test(dentries[j], sigen)); -+ } -+ au_dpages_free(&dpages); -+} -+ -+void au_dbg_verify_kthread(void) -+{ -+ if (au_wkq_test()) { -+ au_dbg_blocked(); -+ /* -+ * It may be recursive, but udba=notify between two aufs mounts, -+ * where a single ro branch is shared, is not a problem. -+ */ -+ /* WARN_ON(1); */ -+ } -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int __init au_debug_init(void) -+{ -+ aufs_bindex_t bindex; -+ struct au_vdir_destr destr; -+ -+ bindex = -1; -+ AuDebugOn(bindex >= 0); -+ -+ destr.len = -1; -+ AuDebugOn(destr.len < NAME_MAX); -+ -+#ifdef CONFIG_4KSTACKS -+ pr_warn("CONFIG_4KSTACKS is defined.\n"); -+#endif -+ -+ return 0; -+} -diff --git a/fs/aufs/debug.h b/fs/aufs/debug.h -new file mode 100644 -index 000000000000..9c52470a61fb ---- /dev/null -+++ b/fs/aufs/debug.h -@@ -0,0 +1,226 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * debug print functions -+ */ -+ -+#ifndef __AUFS_DEBUG_H__ -+#define __AUFS_DEBUG_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/atomic.h> -+#include <linux/module.h> -+#include <linux/kallsyms.h> -+#include <linux/sysrq.h> -+ -+#ifdef CONFIG_AUFS_DEBUG -+#define AuDebugOn(a) BUG_ON(a) -+ -+/* module parameter */ -+extern atomic_t aufs_debug; -+static inline void au_debug_on(void) -+{ -+ atomic_inc(&aufs_debug); -+} -+static inline void au_debug_off(void) -+{ -+ atomic_dec_if_positive(&aufs_debug); -+} -+ -+static inline int au_debug_test(void) -+{ -+ return atomic_read(&aufs_debug) > 0; -+} -+#else -+#define AuDebugOn(a) do {} while (0) -+AuStubVoid(au_debug_on, void) -+AuStubVoid(au_debug_off, void) -+AuStubInt0(au_debug_test, void) -+#endif /* CONFIG_AUFS_DEBUG */ -+ -+#define param_check_atomic_t(name, p) __param_check(name, p, atomic_t) -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* debug print */ -+ -+#define AuDbg(fmt, ...) do { \ -+ if (au_debug_test()) \ -+ pr_debug("DEBUG: " fmt, ##__VA_ARGS__); \ -+} while (0) -+#define AuLabel(l) AuDbg(#l "\n") -+#define AuIOErr(fmt, ...) pr_err("I/O Error, " fmt, ##__VA_ARGS__) -+#define AuWarn1(fmt, ...) do { \ -+ static unsigned char _c; \ -+ if (!_c++) \ -+ pr_warn(fmt, ##__VA_ARGS__); \ -+} while (0) -+ -+#define AuErr1(fmt, ...) do { \ -+ static unsigned char _c; \ -+ if (!_c++) \ -+ pr_err(fmt, ##__VA_ARGS__); \ -+} while (0) -+ -+#define AuIOErr1(fmt, ...) do { \ -+ static unsigned char _c; \ -+ if (!_c++) \ -+ AuIOErr(fmt, ##__VA_ARGS__); \ -+} while (0) -+ -+#define AuUnsupportMsg "This operation is not supported." \ -+ " Please report this application to aufs-users ML." -+#define AuUnsupport(fmt, ...) do { \ -+ pr_err(AuUnsupportMsg "\n" fmt, ##__VA_ARGS__); \ -+ dump_stack(); \ -+} while (0) -+ -+#define AuTraceErr(e) do { \ -+ if (unlikely((e) < 0)) \ -+ AuDbg("err %d\n", (int)(e)); \ -+} while (0) -+ -+#define AuTraceErrPtr(p) do { \ -+ if (IS_ERR(p)) \ -+ AuDbg("err %ld\n", PTR_ERR(p)); \ -+} while (0) -+ -+/* dirty macros for debug print, use with "%.*s" and caution */ -+#define AuLNPair(qstr) (qstr)->len, (qstr)->name -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct dentry; -+#ifdef CONFIG_AUFS_DEBUG -+extern struct mutex au_dbg_mtx; -+extern char *au_plevel; -+struct au_nhash; -+void au_dpri_whlist(struct au_nhash *whlist); -+struct au_vdir; -+void au_dpri_vdir(struct au_vdir *vdir); -+struct inode; -+void au_dpri_inode(struct inode *inode); -+void au_dpri_dalias(struct inode *inode); -+void au_dpri_dentry(struct dentry *dentry); -+struct file; -+void au_dpri_file(struct file *filp); -+struct super_block; -+void au_dpri_sb(struct super_block *sb); -+ -+#define au_dbg_verify_dinode(d) __au_dbg_verify_dinode(d, __func__, __LINE__) -+void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line); -+void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen); -+void au_dbg_verify_kthread(void); -+ -+int __init au_debug_init(void); -+ -+#define AuDbgWhlist(w) do { \ -+ mutex_lock(&au_dbg_mtx); \ -+ AuDbg(#w "\n"); \ -+ au_dpri_whlist(w); \ -+ mutex_unlock(&au_dbg_mtx); \ -+} while (0) -+ -+#define AuDbgVdir(v) do { \ -+ mutex_lock(&au_dbg_mtx); \ -+ AuDbg(#v "\n"); \ -+ au_dpri_vdir(v); \ -+ mutex_unlock(&au_dbg_mtx); \ -+} while (0) -+ -+#define AuDbgInode(i) do { \ -+ mutex_lock(&au_dbg_mtx); \ -+ AuDbg(#i "\n"); \ -+ au_dpri_inode(i); \ -+ mutex_unlock(&au_dbg_mtx); \ -+} while (0) -+ -+#define AuDbgDAlias(i) do { \ -+ mutex_lock(&au_dbg_mtx); \ -+ AuDbg(#i "\n"); \ -+ au_dpri_dalias(i); \ -+ mutex_unlock(&au_dbg_mtx); \ -+} while (0) -+ -+#define AuDbgDentry(d) do { \ -+ mutex_lock(&au_dbg_mtx); \ -+ AuDbg(#d "\n"); \ -+ au_dpri_dentry(d); \ -+ mutex_unlock(&au_dbg_mtx); \ -+} while (0) -+ -+#define AuDbgFile(f) do { \ -+ mutex_lock(&au_dbg_mtx); \ -+ AuDbg(#f "\n"); \ -+ au_dpri_file(f); \ -+ mutex_unlock(&au_dbg_mtx); \ -+} while (0) -+ -+#define AuDbgSb(sb) do { \ -+ mutex_lock(&au_dbg_mtx); \ -+ AuDbg(#sb "\n"); \ -+ au_dpri_sb(sb); \ -+ mutex_unlock(&au_dbg_mtx); \ -+} while (0) -+ -+#define AuDbgSym(addr) do { \ -+ char sym[KSYM_SYMBOL_LEN]; \ -+ sprint_symbol(sym, (unsigned long)addr); \ -+ AuDbg("%s\n", sym); \ -+} while (0) -+#else -+AuStubVoid(au_dbg_verify_dinode, struct dentry *dentry) -+AuStubVoid(au_dbg_verify_gen, struct dentry *parent, unsigned int sigen) -+AuStubVoid(au_dbg_verify_kthread, void) -+AuStubInt0(__init au_debug_init, void) -+ -+#define AuDbgWhlist(w) do {} while (0) -+#define AuDbgVdir(v) do {} while (0) -+#define AuDbgInode(i) do {} while (0) -+#define AuDbgDAlias(i) do {} while (0) -+#define AuDbgDentry(d) do {} while (0) -+#define AuDbgFile(f) do {} while (0) -+#define AuDbgSb(sb) do {} while (0) -+#define AuDbgSym(addr) do {} while (0) -+#endif /* CONFIG_AUFS_DEBUG */ -+ -+/* ---------------------------------------------------------------------- */ -+ -+#ifdef CONFIG_AUFS_MAGIC_SYSRQ -+int __init au_sysrq_init(void); -+void au_sysrq_fin(void); -+ -+#ifdef CONFIG_HW_CONSOLE -+#define au_dbg_blocked() do { \ -+ WARN_ON(1); \ -+ handle_sysrq('w'); \ -+} while (0) -+#else -+AuStubVoid(au_dbg_blocked, void) -+#endif -+ -+#else -+AuStubInt0(__init au_sysrq_init, void) -+AuStubVoid(au_sysrq_fin, void) -+AuStubVoid(au_dbg_blocked, void) -+#endif /* CONFIG_AUFS_MAGIC_SYSRQ */ -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_DEBUG_H__ */ -diff --git a/fs/aufs/dentry.c b/fs/aufs/dentry.c -new file mode 100644 -index 000000000000..faf664508e64 ---- /dev/null -+++ b/fs/aufs/dentry.c -@@ -0,0 +1,1154 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * lookup and dentry operations -+ */ -+ -+#include <linux/iversion.h> -+#include <linux/namei.h> -+#include "aufs.h" -+ -+/* -+ * returns positive/negative dentry, NULL or an error. -+ * NULL means whiteout-ed or not-found. -+ */ -+static struct dentry* -+au_do_lookup(struct dentry *h_parent, struct dentry *dentry, -+ aufs_bindex_t bindex, struct au_do_lookup_args *args) -+{ -+ struct dentry *h_dentry; -+ struct inode *h_inode; -+ struct au_branch *br; -+ int wh_found, opq; -+ unsigned char wh_able; -+ const unsigned char allow_neg = !!au_ftest_lkup(args->flags, ALLOW_NEG); -+ const unsigned char ignore_perm = !!au_ftest_lkup(args->flags, -+ IGNORE_PERM); -+ -+ wh_found = 0; -+ br = au_sbr(dentry->d_sb, bindex); -+ wh_able = !!au_br_whable(br->br_perm); -+ if (wh_able) -+ wh_found = au_wh_test(h_parent, &args->whname, ignore_perm); -+ h_dentry = ERR_PTR(wh_found); -+ if (!wh_found) -+ goto real_lookup; -+ if (unlikely(wh_found < 0)) -+ goto out; -+ -+ /* We found a whiteout */ -+ /* au_set_dbbot(dentry, bindex); */ -+ au_set_dbwh(dentry, bindex); -+ if (!allow_neg) -+ return NULL; /* success */ -+ -+real_lookup: -+ if (!ignore_perm) -+ h_dentry = vfsub_lkup_one(args->name, h_parent); -+ else -+ h_dentry = au_sio_lkup_one(args->name, h_parent); -+ if (IS_ERR(h_dentry)) { -+ if (PTR_ERR(h_dentry) == -ENAMETOOLONG -+ && !allow_neg) -+ h_dentry = NULL; -+ goto out; -+ } -+ -+ h_inode = d_inode(h_dentry); -+ if (d_is_negative(h_dentry)) { -+ if (!allow_neg) -+ goto out_neg; -+ } else if (wh_found -+ || (args->type && args->type != (h_inode->i_mode & S_IFMT))) -+ goto out_neg; -+ else if (au_ftest_lkup(args->flags, DIRREN) -+ /* && h_inode */ -+ && !au_dr_lkup_h_ino(args, bindex, h_inode->i_ino)) { -+ AuDbg("b%d %pd ignored hi%llu\n", bindex, h_dentry, -+ (unsigned long long)h_inode->i_ino); -+ goto out_neg; -+ } -+ -+ if (au_dbbot(dentry) <= bindex) -+ au_set_dbbot(dentry, bindex); -+ if (au_dbtop(dentry) < 0 || bindex < au_dbtop(dentry)) -+ au_set_dbtop(dentry, bindex); -+ au_set_h_dptr(dentry, bindex, h_dentry); -+ -+ if (!d_is_dir(h_dentry) -+ || !wh_able -+ || (d_really_is_positive(dentry) && !d_is_dir(dentry))) -+ goto out; /* success */ -+ -+ inode_lock_shared_nested(h_inode, AuLsc_I_CHILD); -+ opq = au_diropq_test(h_dentry); -+ inode_unlock_shared(h_inode); -+ if (opq > 0) -+ au_set_dbdiropq(dentry, bindex); -+ else if (unlikely(opq < 0)) { -+ au_set_h_dptr(dentry, bindex, NULL); -+ h_dentry = ERR_PTR(opq); -+ } -+ goto out; -+ -+out_neg: -+ dput(h_dentry); -+ h_dentry = NULL; -+out: -+ return h_dentry; -+} -+ -+static int au_test_shwh(struct super_block *sb, const struct qstr *name) -+{ -+ if (unlikely(!au_opt_test(au_mntflags(sb), SHWH) -+ && !strncmp(name->name, AUFS_WH_PFX, AUFS_WH_PFX_LEN))) -+ return -EPERM; -+ return 0; -+} -+ -+/* -+ * returns the number of lower positive dentries, -+ * otherwise an error. -+ * can be called at unlinking with @type is zero. -+ */ -+int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t btop, -+ unsigned int flags) -+{ -+ int npositive, err; -+ aufs_bindex_t bindex, btail, bdiropq; -+ unsigned char isdir, dirperm1, dirren; -+ struct au_do_lookup_args args = { -+ .flags = flags, -+ .name = &dentry->d_name -+ }; -+ struct dentry *parent; -+ struct super_block *sb; -+ -+ sb = dentry->d_sb; -+ err = au_test_shwh(sb, args.name); -+ if (unlikely(err)) -+ goto out; -+ -+ err = au_wh_name_alloc(&args.whname, args.name); -+ if (unlikely(err)) -+ goto out; -+ -+ isdir = !!d_is_dir(dentry); -+ dirperm1 = !!au_opt_test(au_mntflags(sb), DIRPERM1); -+ dirren = !!au_opt_test(au_mntflags(sb), DIRREN); -+ if (dirren) -+ au_fset_lkup(args.flags, DIRREN); -+ -+ npositive = 0; -+ parent = dget_parent(dentry); -+ btail = au_dbtaildir(parent); -+ for (bindex = btop; bindex <= btail; bindex++) { -+ struct dentry *h_parent, *h_dentry; -+ struct inode *h_inode, *h_dir; -+ struct au_branch *br; -+ -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (h_dentry) { -+ if (d_is_positive(h_dentry)) -+ npositive++; -+ break; -+ } -+ h_parent = au_h_dptr(parent, bindex); -+ if (!h_parent || !d_is_dir(h_parent)) -+ continue; -+ -+ if (dirren) { -+ /* if the inum matches, then use the prepared name */ -+ err = au_dr_lkup_name(&args, bindex); -+ if (unlikely(err)) -+ goto out_parent; -+ } -+ -+ h_dir = d_inode(h_parent); -+ inode_lock_shared_nested(h_dir, AuLsc_I_PARENT); -+ h_dentry = au_do_lookup(h_parent, dentry, bindex, &args); -+ inode_unlock_shared(h_dir); -+ err = PTR_ERR(h_dentry); -+ if (IS_ERR(h_dentry)) -+ goto out_parent; -+ if (h_dentry) -+ au_fclr_lkup(args.flags, ALLOW_NEG); -+ if (dirperm1) -+ au_fset_lkup(args.flags, IGNORE_PERM); -+ -+ if (au_dbwh(dentry) == bindex) -+ break; -+ if (!h_dentry) -+ continue; -+ if (d_is_negative(h_dentry)) -+ continue; -+ h_inode = d_inode(h_dentry); -+ npositive++; -+ if (!args.type) -+ args.type = h_inode->i_mode & S_IFMT; -+ if (args.type != S_IFDIR) -+ break; -+ else if (isdir) { -+ /* the type of lower may be different */ -+ bdiropq = au_dbdiropq(dentry); -+ if (bdiropq >= 0 && bdiropq <= bindex) -+ break; -+ } -+ br = au_sbr(sb, bindex); -+ if (dirren -+ && au_dr_hino_test_add(&br->br_dirren, h_inode->i_ino, -+ /*add_ent*/NULL)) { -+ /* prepare next name to lookup */ -+ err = au_dr_lkup(&args, dentry, bindex); -+ if (unlikely(err)) -+ goto out_parent; -+ } -+ } -+ -+ if (npositive) { -+ AuLabel(positive); -+ au_update_dbtop(dentry); -+ } -+ err = npositive; -+ if (unlikely(!au_opt_test(au_mntflags(sb), UDBA_NONE) -+ && au_dbtop(dentry) < 0)) { -+ err = -EIO; -+ AuIOErr("both of real entry and whiteout found, %pd, err %d\n", -+ dentry, err); -+ } -+ -+out_parent: -+ dput(parent); -+ au_kfree_try_rcu(args.whname.name); -+ if (dirren) -+ au_dr_lkup_fin(&args); -+out: -+ return err; -+} -+ -+struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent) -+{ -+ struct dentry *dentry; -+ int wkq_err; -+ -+ if (!au_test_h_perm_sio(d_inode(parent), MAY_EXEC)) -+ dentry = vfsub_lkup_one(name, parent); -+ else { -+ struct vfsub_lkup_one_args args = { -+ .errp = &dentry, -+ .name = name, -+ .parent = parent -+ }; -+ -+ wkq_err = au_wkq_wait(vfsub_call_lkup_one, &args); -+ if (unlikely(wkq_err)) -+ dentry = ERR_PTR(wkq_err); -+ } -+ -+ return dentry; -+} -+ -+/* -+ * lookup @dentry on @bindex which should be negative. -+ */ -+int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex, int wh) -+{ -+ int err; -+ struct dentry *parent, *h_parent, *h_dentry; -+ struct au_branch *br; -+ -+ parent = dget_parent(dentry); -+ h_parent = au_h_dptr(parent, bindex); -+ br = au_sbr(dentry->d_sb, bindex); -+ if (wh) -+ h_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name); -+ else -+ h_dentry = au_sio_lkup_one(&dentry->d_name, h_parent); -+ err = PTR_ERR(h_dentry); -+ if (IS_ERR(h_dentry)) -+ goto out; -+ if (unlikely(d_is_positive(h_dentry))) { -+ err = -EIO; -+ AuIOErr("%pd should be negative on b%d.\n", h_dentry, bindex); -+ dput(h_dentry); -+ goto out; -+ } -+ -+ err = 0; -+ if (bindex < au_dbtop(dentry)) -+ au_set_dbtop(dentry, bindex); -+ if (au_dbbot(dentry) < bindex) -+ au_set_dbbot(dentry, bindex); -+ au_set_h_dptr(dentry, bindex, h_dentry); -+ -+out: -+ dput(parent); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* subset of struct inode */ -+struct au_iattr { -+ unsigned long i_ino; -+ /* unsigned int i_nlink; */ -+ kuid_t i_uid; -+ kgid_t i_gid; -+ u64 i_version; -+/* -+ loff_t i_size; -+ blkcnt_t i_blocks; -+*/ -+ umode_t i_mode; -+}; -+ -+static void au_iattr_save(struct au_iattr *ia, struct inode *h_inode) -+{ -+ ia->i_ino = h_inode->i_ino; -+ /* ia->i_nlink = h_inode->i_nlink; */ -+ ia->i_uid = h_inode->i_uid; -+ ia->i_gid = h_inode->i_gid; -+ ia->i_version = inode_query_iversion(h_inode); -+/* -+ ia->i_size = h_inode->i_size; -+ ia->i_blocks = h_inode->i_blocks; -+*/ -+ ia->i_mode = (h_inode->i_mode & S_IFMT); -+} -+ -+static int au_iattr_test(struct au_iattr *ia, struct inode *h_inode) -+{ -+ return ia->i_ino != h_inode->i_ino -+ /* || ia->i_nlink != h_inode->i_nlink */ -+ || !uid_eq(ia->i_uid, h_inode->i_uid) -+ || !gid_eq(ia->i_gid, h_inode->i_gid) -+ || !inode_eq_iversion(h_inode, ia->i_version) -+/* -+ || ia->i_size != h_inode->i_size -+ || ia->i_blocks != h_inode->i_blocks -+*/ -+ || ia->i_mode != (h_inode->i_mode & S_IFMT); -+} -+ -+static int au_h_verify_dentry(struct dentry *h_dentry, struct dentry *h_parent, -+ struct au_branch *br) -+{ -+ int err; -+ struct au_iattr ia; -+ struct inode *h_inode; -+ struct dentry *h_d; -+ struct super_block *h_sb; -+ -+ err = 0; -+ memset(&ia, -1, sizeof(ia)); -+ h_sb = h_dentry->d_sb; -+ h_inode = NULL; -+ if (d_is_positive(h_dentry)) { -+ h_inode = d_inode(h_dentry); -+ au_iattr_save(&ia, h_inode); -+ } else if (au_test_nfs(h_sb) || au_test_fuse(h_sb)) -+ /* nfs d_revalidate may return 0 for negative dentry */ -+ /* fuse d_revalidate always return 0 for negative dentry */ -+ goto out; -+ -+ /* main purpose is namei.c:cached_lookup() and d_revalidate */ -+ h_d = vfsub_lkup_one(&h_dentry->d_name, h_parent); -+ err = PTR_ERR(h_d); -+ if (IS_ERR(h_d)) -+ goto out; -+ -+ err = 0; -+ if (unlikely(h_d != h_dentry -+ || d_inode(h_d) != h_inode -+ || (h_inode && au_iattr_test(&ia, h_inode)))) -+ err = au_busy_or_stale(); -+ dput(h_d); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir, -+ struct dentry *h_parent, struct au_branch *br) -+{ -+ int err; -+ -+ err = 0; -+ if (udba == AuOpt_UDBA_REVAL -+ && !au_test_fs_remote(h_dentry->d_sb)) { -+ IMustLock(h_dir); -+ err = (d_inode(h_dentry->d_parent) != h_dir); -+ } else if (udba != AuOpt_UDBA_NONE) -+ err = au_h_verify_dentry(h_dentry, h_parent, br); -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_do_refresh_hdentry(struct dentry *dentry, struct dentry *parent) -+{ -+ int err; -+ aufs_bindex_t new_bindex, bindex, bbot, bwh, bdiropq; -+ struct au_hdentry tmp, *p, *q; -+ struct au_dinfo *dinfo; -+ struct super_block *sb; -+ -+ DiMustWriteLock(dentry); -+ -+ sb = dentry->d_sb; -+ dinfo = au_di(dentry); -+ bbot = dinfo->di_bbot; -+ bwh = dinfo->di_bwh; -+ bdiropq = dinfo->di_bdiropq; -+ bindex = dinfo->di_btop; -+ p = au_hdentry(dinfo, bindex); -+ for (; bindex <= bbot; bindex++, p++) { -+ if (!p->hd_dentry) -+ continue; -+ -+ new_bindex = au_br_index(sb, p->hd_id); -+ if (new_bindex == bindex) -+ continue; -+ -+ if (dinfo->di_bwh == bindex) -+ bwh = new_bindex; -+ if (dinfo->di_bdiropq == bindex) -+ bdiropq = new_bindex; -+ if (new_bindex < 0) { -+ au_hdput(p); -+ p->hd_dentry = NULL; -+ continue; -+ } -+ -+ /* swap two lower dentries, and loop again */ -+ q = au_hdentry(dinfo, new_bindex); -+ tmp = *q; -+ *q = *p; -+ *p = tmp; -+ if (tmp.hd_dentry) { -+ bindex--; -+ p--; -+ } -+ } -+ -+ dinfo->di_bwh = -1; -+ if (bwh >= 0 && bwh <= au_sbbot(sb) && au_sbr_whable(sb, bwh)) -+ dinfo->di_bwh = bwh; -+ -+ dinfo->di_bdiropq = -1; -+ if (bdiropq >= 0 -+ && bdiropq <= au_sbbot(sb) -+ && au_sbr_whable(sb, bdiropq)) -+ dinfo->di_bdiropq = bdiropq; -+ -+ err = -EIO; -+ dinfo->di_btop = -1; -+ dinfo->di_bbot = -1; -+ bbot = au_dbbot(parent); -+ bindex = 0; -+ p = au_hdentry(dinfo, bindex); -+ for (; bindex <= bbot; bindex++, p++) -+ if (p->hd_dentry) { -+ dinfo->di_btop = bindex; -+ break; -+ } -+ -+ if (dinfo->di_btop >= 0) { -+ bindex = bbot; -+ p = au_hdentry(dinfo, bindex); -+ for (; bindex >= 0; bindex--, p--) -+ if (p->hd_dentry) { -+ dinfo->di_bbot = bindex; -+ err = 0; -+ break; -+ } -+ } -+ -+ return err; -+} -+ -+static void au_do_hide(struct dentry *dentry) -+{ -+ struct inode *inode; -+ -+ if (d_really_is_positive(dentry)) { -+ inode = d_inode(dentry); -+ if (!d_is_dir(dentry)) { -+ if (inode->i_nlink && !d_unhashed(dentry)) -+ drop_nlink(inode); -+ } else { -+ clear_nlink(inode); -+ /* stop next lookup */ -+ inode->i_flags |= S_DEAD; -+ } -+ smp_mb(); /* necessary? */ -+ } -+ d_drop(dentry); -+} -+ -+static int au_hide_children(struct dentry *parent) -+{ -+ int err, i, j, ndentry; -+ struct au_dcsub_pages dpages; -+ struct au_dpage *dpage; -+ struct dentry *dentry; -+ -+ err = au_dpages_init(&dpages, GFP_NOFS); -+ if (unlikely(err)) -+ goto out; -+ err = au_dcsub_pages(&dpages, parent, NULL, NULL); -+ if (unlikely(err)) -+ goto out_dpages; -+ -+ /* in reverse order */ -+ for (i = dpages.ndpage - 1; i >= 0; i--) { -+ dpage = dpages.dpages + i; -+ ndentry = dpage->ndentry; -+ for (j = ndentry - 1; j >= 0; j--) { -+ dentry = dpage->dentries[j]; -+ if (dentry != parent) -+ au_do_hide(dentry); -+ } -+ } -+ -+out_dpages: -+ au_dpages_free(&dpages); -+out: -+ return err; -+} -+ -+static void au_hide(struct dentry *dentry) -+{ -+ int err; -+ -+ AuDbgDentry(dentry); -+ if (d_is_dir(dentry)) { -+ /* shrink_dcache_parent(dentry); */ -+ err = au_hide_children(dentry); -+ if (unlikely(err)) -+ AuIOErr("%pd, failed hiding children, ignored %d\n", -+ dentry, err); -+ } -+ au_do_hide(dentry); -+} -+ -+/* -+ * By adding a dirty branch, a cached dentry may be affected in various ways. -+ * -+ * a dirty branch is added -+ * - on the top of layers -+ * - in the middle of layers -+ * - to the bottom of layers -+ * -+ * on the added branch there exists -+ * - a whiteout -+ * - a diropq -+ * - a same named entry -+ * + exist -+ * * negative --> positive -+ * * positive --> positive -+ * - type is unchanged -+ * - type is changed -+ * + doesn't exist -+ * * negative --> negative -+ * * positive --> negative (rejected by au_br_del() for non-dir case) -+ * - none -+ */ -+static int au_refresh_by_dinfo(struct dentry *dentry, struct au_dinfo *dinfo, -+ struct au_dinfo *tmp) -+{ -+ int err; -+ aufs_bindex_t bindex, bbot; -+ struct { -+ struct dentry *dentry; -+ struct inode *inode; -+ mode_t mode; -+ } orig_h, tmp_h = { -+ .dentry = NULL -+ }; -+ struct au_hdentry *hd; -+ struct inode *inode, *h_inode; -+ struct dentry *h_dentry; -+ -+ err = 0; -+ AuDebugOn(dinfo->di_btop < 0); -+ orig_h.mode = 0; -+ orig_h.dentry = au_hdentry(dinfo, dinfo->di_btop)->hd_dentry; -+ orig_h.inode = NULL; -+ if (d_is_positive(orig_h.dentry)) { -+ orig_h.inode = d_inode(orig_h.dentry); -+ orig_h.mode = orig_h.inode->i_mode & S_IFMT; -+ } -+ if (tmp->di_btop >= 0) { -+ tmp_h.dentry = au_hdentry(tmp, tmp->di_btop)->hd_dentry; -+ if (d_is_positive(tmp_h.dentry)) { -+ tmp_h.inode = d_inode(tmp_h.dentry); -+ tmp_h.mode = tmp_h.inode->i_mode & S_IFMT; -+ } -+ } -+ -+ inode = NULL; -+ if (d_really_is_positive(dentry)) -+ inode = d_inode(dentry); -+ if (!orig_h.inode) { -+ AuDbg("negative originally\n"); -+ if (inode) { -+ au_hide(dentry); -+ goto out; -+ } -+ AuDebugOn(inode); -+ AuDebugOn(dinfo->di_btop != dinfo->di_bbot); -+ AuDebugOn(dinfo->di_bdiropq != -1); -+ -+ if (!tmp_h.inode) { -+ AuDbg("negative --> negative\n"); -+ /* should have only one negative lower */ -+ if (tmp->di_btop >= 0 -+ && tmp->di_btop < dinfo->di_btop) { -+ AuDebugOn(tmp->di_btop != tmp->di_bbot); -+ AuDebugOn(dinfo->di_btop != dinfo->di_bbot); -+ au_set_h_dptr(dentry, dinfo->di_btop, NULL); -+ au_di_cp(dinfo, tmp); -+ hd = au_hdentry(tmp, tmp->di_btop); -+ au_set_h_dptr(dentry, tmp->di_btop, -+ dget(hd->hd_dentry)); -+ } -+ au_dbg_verify_dinode(dentry); -+ } else { -+ AuDbg("negative --> positive\n"); -+ /* -+ * similar to the behaviour of creating with bypassing -+ * aufs. -+ * unhash it in order to force an error in the -+ * succeeding create operation. -+ * we should not set S_DEAD here. -+ */ -+ d_drop(dentry); -+ /* au_di_swap(tmp, dinfo); */ -+ au_dbg_verify_dinode(dentry); -+ } -+ } else { -+ AuDbg("positive originally\n"); -+ /* inode may be NULL */ -+ AuDebugOn(inode && (inode->i_mode & S_IFMT) != orig_h.mode); -+ if (!tmp_h.inode) { -+ AuDbg("positive --> negative\n"); -+ /* or bypassing aufs */ -+ au_hide(dentry); -+ if (tmp->di_bwh >= 0 && tmp->di_bwh <= dinfo->di_btop) -+ dinfo->di_bwh = tmp->di_bwh; -+ if (inode) -+ err = au_refresh_hinode_self(inode); -+ au_dbg_verify_dinode(dentry); -+ } else if (orig_h.mode == tmp_h.mode) { -+ AuDbg("positive --> positive, same type\n"); -+ if (!S_ISDIR(orig_h.mode) -+ && dinfo->di_btop > tmp->di_btop) { -+ /* -+ * similar to the behaviour of removing and -+ * creating. -+ */ -+ au_hide(dentry); -+ if (inode) -+ err = au_refresh_hinode_self(inode); -+ au_dbg_verify_dinode(dentry); -+ } else { -+ /* fill empty slots */ -+ if (dinfo->di_btop > tmp->di_btop) -+ dinfo->di_btop = tmp->di_btop; -+ if (dinfo->di_bbot < tmp->di_bbot) -+ dinfo->di_bbot = tmp->di_bbot; -+ dinfo->di_bwh = tmp->di_bwh; -+ dinfo->di_bdiropq = tmp->di_bdiropq; -+ bbot = dinfo->di_bbot; -+ bindex = tmp->di_btop; -+ hd = au_hdentry(tmp, bindex); -+ for (; bindex <= bbot; bindex++, hd++) { -+ if (au_h_dptr(dentry, bindex)) -+ continue; -+ h_dentry = hd->hd_dentry; -+ if (!h_dentry) -+ continue; -+ AuDebugOn(d_is_negative(h_dentry)); -+ h_inode = d_inode(h_dentry); -+ AuDebugOn(orig_h.mode -+ != (h_inode->i_mode -+ & S_IFMT)); -+ au_set_h_dptr(dentry, bindex, -+ dget(h_dentry)); -+ } -+ if (inode) -+ err = au_refresh_hinode(inode, dentry); -+ au_dbg_verify_dinode(dentry); -+ } -+ } else { -+ AuDbg("positive --> positive, different type\n"); -+ /* similar to the behaviour of removing and creating */ -+ au_hide(dentry); -+ if (inode) -+ err = au_refresh_hinode_self(inode); -+ au_dbg_verify_dinode(dentry); -+ } -+ } -+ -+out: -+ return err; -+} -+ -+void au_refresh_dop(struct dentry *dentry, int force_reval) -+{ -+ const struct dentry_operations *dop -+ = force_reval ? &aufs_dop : dentry->d_sb->s_d_op; -+ static const unsigned int mask -+ = DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE; -+ -+ BUILD_BUG_ON(sizeof(mask) != sizeof(dentry->d_flags)); -+ -+ if (dentry->d_op == dop) -+ return; -+ -+ AuDbg("%pd\n", dentry); -+ spin_lock(&dentry->d_lock); -+ if (dop == &aufs_dop) -+ dentry->d_flags |= mask; -+ else -+ dentry->d_flags &= ~mask; -+ dentry->d_op = dop; -+ spin_unlock(&dentry->d_lock); -+} -+ -+int au_refresh_dentry(struct dentry *dentry, struct dentry *parent) -+{ -+ int err, ebrange, nbr; -+ unsigned int sigen; -+ struct au_dinfo *dinfo, *tmp; -+ struct super_block *sb; -+ struct inode *inode; -+ -+ DiMustWriteLock(dentry); -+ AuDebugOn(IS_ROOT(dentry)); -+ AuDebugOn(d_really_is_negative(parent)); -+ -+ sb = dentry->d_sb; -+ sigen = au_sigen(sb); -+ err = au_digen_test(parent, sigen); -+ if (unlikely(err)) -+ goto out; -+ -+ nbr = au_sbbot(sb) + 1; -+ dinfo = au_di(dentry); -+ err = au_di_realloc(dinfo, nbr, /*may_shrink*/0); -+ if (unlikely(err)) -+ goto out; -+ ebrange = au_dbrange_test(dentry); -+ if (!ebrange) -+ ebrange = au_do_refresh_hdentry(dentry, parent); -+ -+ if (d_unhashed(dentry) || ebrange /* || dinfo->di_tmpfile */) { -+ AuDebugOn(au_dbtop(dentry) < 0 && au_dbbot(dentry) >= 0); -+ if (d_really_is_positive(dentry)) { -+ inode = d_inode(dentry); -+ err = au_refresh_hinode_self(inode); -+ } -+ au_dbg_verify_dinode(dentry); -+ if (!err) -+ goto out_dgen; /* success */ -+ goto out; -+ } -+ -+ /* temporary dinfo */ -+ AuDbgDentry(dentry); -+ err = -ENOMEM; -+ tmp = au_di_alloc(sb, AuLsc_DI_TMP); -+ if (unlikely(!tmp)) -+ goto out; -+ au_di_swap(tmp, dinfo); -+ /* returns the number of positive dentries */ -+ /* -+ * if current working dir is removed, it returns an error. -+ * but the dentry is legal. -+ */ -+ err = au_lkup_dentry(dentry, /*btop*/0, AuLkup_ALLOW_NEG); -+ AuDbgDentry(dentry); -+ au_di_swap(tmp, dinfo); -+ if (err == -ENOENT) -+ err = 0; -+ if (err >= 0) { -+ /* compare/refresh by dinfo */ -+ AuDbgDentry(dentry); -+ err = au_refresh_by_dinfo(dentry, dinfo, tmp); -+ au_dbg_verify_dinode(dentry); -+ AuTraceErr(err); -+ } -+ au_di_realloc(dinfo, nbr, /*may_shrink*/1); /* harmless if err */ -+ au_rw_write_unlock(&tmp->di_rwsem); -+ au_di_free(tmp); -+ if (unlikely(err)) -+ goto out; -+ -+out_dgen: -+ au_update_digen(dentry); -+out: -+ if (unlikely(err && !(dentry->d_flags & DCACHE_NFSFS_RENAMED))) { -+ AuIOErr("failed refreshing %pd, %d\n", dentry, err); -+ AuDbgDentry(dentry); -+ } -+ AuTraceErr(err); -+ return err; -+} -+ -+static int au_do_h_d_reval(struct dentry *h_dentry, unsigned int flags, -+ struct dentry *dentry, aufs_bindex_t bindex) -+{ -+ int err, valid; -+ -+ err = 0; -+ if (!(h_dentry->d_flags & DCACHE_OP_REVALIDATE)) -+ goto out; -+ -+ AuDbg("b%d\n", bindex); -+ /* -+ * gave up supporting LOOKUP_CREATE/OPEN for lower fs, -+ * due to whiteout and branch permission. -+ */ -+ flags &= ~(/*LOOKUP_PARENT |*/ LOOKUP_OPEN | LOOKUP_CREATE -+ | LOOKUP_FOLLOW | LOOKUP_EXCL); -+ /* it may return tri-state */ -+ valid = h_dentry->d_op->d_revalidate(h_dentry, flags); -+ -+ if (unlikely(valid < 0)) -+ err = valid; -+ else if (!valid) -+ err = -EINVAL; -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* todo: remove this */ -+static int h_d_revalidate(struct dentry *dentry, struct inode *inode, -+ unsigned int flags, int do_udba, int dirren) -+{ -+ int err; -+ umode_t mode, h_mode; -+ aufs_bindex_t bindex, btail, btop, ibs, ibe; -+ unsigned char plus, unhashed, is_root, h_plus, h_nfs, tmpfile; -+ struct inode *h_inode, *h_cached_inode; -+ struct dentry *h_dentry; -+ struct qstr *name, *h_name; -+ -+ err = 0; -+ plus = 0; -+ mode = 0; -+ ibs = -1; -+ ibe = -1; -+ unhashed = !!d_unhashed(dentry); -+ is_root = !!IS_ROOT(dentry); -+ name = &dentry->d_name; -+ tmpfile = au_di(dentry)->di_tmpfile; -+ -+ /* -+ * Theoretically, REVAL test should be unnecessary in case of -+ * {FS,I}NOTIFY. -+ * But {fs,i}notify doesn't fire some necessary events, -+ * IN_ATTRIB for atime/nlink/pageio -+ * Let's do REVAL test too. -+ */ -+ if (do_udba && inode) { -+ mode = (inode->i_mode & S_IFMT); -+ plus = (inode->i_nlink > 0); -+ ibs = au_ibtop(inode); -+ ibe = au_ibbot(inode); -+ } -+ -+ btop = au_dbtop(dentry); -+ btail = btop; -+ if (inode && S_ISDIR(inode->i_mode)) -+ btail = au_dbtaildir(dentry); -+ for (bindex = btop; bindex <= btail; bindex++) { -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (!h_dentry) -+ continue; -+ -+ AuDbg("b%d, %pd\n", bindex, h_dentry); -+ h_nfs = !!au_test_nfs(h_dentry->d_sb); -+ spin_lock(&h_dentry->d_lock); -+ h_name = &h_dentry->d_name; -+ if (unlikely(do_udba -+ && !is_root -+ && ((!h_nfs -+ && (unhashed != !!d_unhashed(h_dentry) -+ || (!tmpfile && !dirren -+ && !au_qstreq(name, h_name)) -+ )) -+ || (h_nfs -+ && !(flags & LOOKUP_OPEN) -+ && (h_dentry->d_flags -+ & DCACHE_NFSFS_RENAMED))) -+ )) { -+ int h_unhashed; -+ -+ h_unhashed = d_unhashed(h_dentry); -+ spin_unlock(&h_dentry->d_lock); -+ AuDbg("unhash 0x%x 0x%x, %pd %pd\n", -+ unhashed, h_unhashed, dentry, h_dentry); -+ goto err; -+ } -+ spin_unlock(&h_dentry->d_lock); -+ -+ err = au_do_h_d_reval(h_dentry, flags, dentry, bindex); -+ if (unlikely(err)) -+ /* do not goto err, to keep the errno */ -+ break; -+ -+ /* todo: plink too? */ -+ if (!do_udba) -+ continue; -+ -+ /* UDBA tests */ -+ if (unlikely(!!inode != d_is_positive(h_dentry))) -+ goto err; -+ -+ h_inode = NULL; -+ if (d_is_positive(h_dentry)) -+ h_inode = d_inode(h_dentry); -+ h_plus = plus; -+ h_mode = mode; -+ h_cached_inode = h_inode; -+ if (h_inode) { -+ h_mode = (h_inode->i_mode & S_IFMT); -+ h_plus = (h_inode->i_nlink > 0); -+ } -+ if (inode && ibs <= bindex && bindex <= ibe) -+ h_cached_inode = au_h_iptr(inode, bindex); -+ -+ if (!h_nfs) { -+ if (unlikely(plus != h_plus && !tmpfile)) -+ goto err; -+ } else { -+ if (unlikely(!(h_dentry->d_flags & DCACHE_NFSFS_RENAMED) -+ && !is_root -+ && !IS_ROOT(h_dentry) -+ && unhashed != d_unhashed(h_dentry))) -+ goto err; -+ } -+ if (unlikely(mode != h_mode -+ || h_cached_inode != h_inode)) -+ goto err; -+ continue; -+ -+err: -+ err = -EINVAL; -+ break; -+ } -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+/* todo: consolidate with do_refresh() and au_reval_for_attr() */ -+static int simple_reval_dpath(struct dentry *dentry, unsigned int sigen) -+{ -+ int err; -+ struct dentry *parent; -+ -+ if (!au_digen_test(dentry, sigen)) -+ return 0; -+ -+ parent = dget_parent(dentry); -+ di_read_lock_parent(parent, AuLock_IR); -+ AuDebugOn(au_digen_test(parent, sigen)); -+ au_dbg_verify_gen(parent, sigen); -+ err = au_refresh_dentry(dentry, parent); -+ di_read_unlock(parent, AuLock_IR); -+ dput(parent); -+ AuTraceErr(err); -+ return err; -+} -+ -+int au_reval_dpath(struct dentry *dentry, unsigned int sigen) -+{ -+ int err; -+ struct dentry *d, *parent; -+ -+ if (!au_ftest_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR)) -+ return simple_reval_dpath(dentry, sigen); -+ -+ /* slow loop, keep it simple and stupid */ -+ /* cf: au_cpup_dirs() */ -+ err = 0; -+ parent = NULL; -+ while (au_digen_test(dentry, sigen)) { -+ d = dentry; -+ while (1) { -+ dput(parent); -+ parent = dget_parent(d); -+ if (!au_digen_test(parent, sigen)) -+ break; -+ d = parent; -+ } -+ -+ if (d != dentry) -+ di_write_lock_child2(d); -+ -+ /* someone might update our dentry while we were sleeping */ -+ if (au_digen_test(d, sigen)) { -+ /* -+ * todo: consolidate with simple_reval_dpath(), -+ * do_refresh() and au_reval_for_attr(). -+ */ -+ di_read_lock_parent(parent, AuLock_IR); -+ err = au_refresh_dentry(d, parent); -+ di_read_unlock(parent, AuLock_IR); -+ } -+ -+ if (d != dentry) -+ di_write_unlock(d); -+ dput(parent); -+ if (unlikely(err)) -+ break; -+ } -+ -+ return err; -+} -+ -+/* -+ * if valid returns 1, otherwise 0. -+ */ -+static int aufs_d_revalidate(struct dentry *dentry, unsigned int flags) -+{ -+ int valid, err; -+ unsigned int sigen; -+ unsigned char do_udba, dirren; -+ struct super_block *sb; -+ struct inode *inode; -+ -+ /* todo: support rcu-walk? */ -+ if (flags & LOOKUP_RCU) -+ return -ECHILD; -+ -+ valid = 0; -+ if (unlikely(!au_di(dentry))) -+ goto out; -+ -+ valid = 1; -+ sb = dentry->d_sb; -+ /* -+ * todo: very ugly -+ * i_mutex of parent dir may be held, -+ * but we should not return 'invalid' due to busy. -+ */ -+ err = aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW | AuLock_NOPLM); -+ if (unlikely(err)) { -+ valid = err; -+ AuTraceErr(err); -+ goto out; -+ } -+ inode = NULL; -+ if (d_really_is_positive(dentry)) -+ inode = d_inode(dentry); -+ if (unlikely(inode && au_is_bad_inode(inode))) { -+ err = -EINVAL; -+ AuTraceErr(err); -+ goto out_dgrade; -+ } -+ if (unlikely(au_dbrange_test(dentry))) { -+ err = -EINVAL; -+ AuTraceErr(err); -+ goto out_dgrade; -+ } -+ -+ sigen = au_sigen(sb); -+ if (au_digen_test(dentry, sigen)) { -+ AuDebugOn(IS_ROOT(dentry)); -+ err = au_reval_dpath(dentry, sigen); -+ if (unlikely(err)) { -+ AuTraceErr(err); -+ goto out_dgrade; -+ } -+ } -+ di_downgrade_lock(dentry, AuLock_IR); -+ -+ err = -EINVAL; -+ if (!(flags & (LOOKUP_OPEN | LOOKUP_EMPTY)) -+ && inode -+ && !(inode->i_state && I_LINKABLE) -+ && (IS_DEADDIR(inode) || !inode->i_nlink)) { -+ AuTraceErr(err); -+ goto out_inval; -+ } -+ -+ do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE); -+ if (do_udba && inode) { -+ aufs_bindex_t btop = au_ibtop(inode); -+ struct inode *h_inode; -+ -+ if (btop >= 0) { -+ h_inode = au_h_iptr(inode, btop); -+ if (h_inode && au_test_higen(inode, h_inode)) { -+ AuTraceErr(err); -+ goto out_inval; -+ } -+ } -+ } -+ -+ dirren = !!au_opt_test(au_mntflags(sb), DIRREN); -+ err = h_d_revalidate(dentry, inode, flags, do_udba, dirren); -+ if (unlikely(!err && do_udba && au_dbtop(dentry) < 0)) { -+ err = -EIO; -+ AuDbg("both of real entry and whiteout found, %p, err %d\n", -+ dentry, err); -+ } -+ goto out_inval; -+ -+out_dgrade: -+ di_downgrade_lock(dentry, AuLock_IR); -+out_inval: -+ aufs_read_unlock(dentry, AuLock_IR); -+ AuTraceErr(err); -+ valid = !err; -+out: -+ if (!valid) { -+ AuDbg("%pd invalid, %d\n", dentry, valid); -+ d_drop(dentry); -+ } -+ return valid; -+} -+ -+static void aufs_d_release(struct dentry *dentry) -+{ -+ if (au_di(dentry)) { -+ au_di_fin(dentry); -+ au_hn_di_reinit(dentry); -+ } -+} -+ -+const struct dentry_operations aufs_dop = { -+ .d_revalidate = aufs_d_revalidate, -+ .d_weak_revalidate = aufs_d_revalidate, -+ .d_release = aufs_d_release -+}; -+ -+/* aufs_dop without d_revalidate */ -+const struct dentry_operations aufs_dop_noreval = { -+ .d_release = aufs_d_release -+}; -diff --git a/fs/aufs/dentry.h b/fs/aufs/dentry.h -new file mode 100644 -index 000000000000..3b443fc7eef0 ---- /dev/null -+++ b/fs/aufs/dentry.h -@@ -0,0 +1,268 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * lookup and dentry operations -+ */ -+ -+#ifndef __AUFS_DENTRY_H__ -+#define __AUFS_DENTRY_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/dcache.h> -+#include "dirren.h" -+#include "rwsem.h" -+ -+struct au_hdentry { -+ struct dentry *hd_dentry; -+ aufs_bindex_t hd_id; -+}; -+ -+struct au_dinfo { -+ atomic_t di_generation; -+ -+ struct au_rwsem di_rwsem; -+ aufs_bindex_t di_btop, di_bbot, di_bwh, di_bdiropq; -+ unsigned char di_tmpfile; /* to allow the different name */ -+ struct au_hdentry *di_hdentry; -+ struct rcu_head rcu; -+} ____cacheline_aligned_in_smp; -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* flags for au_lkup_dentry() */ -+#define AuLkup_ALLOW_NEG 1 -+#define AuLkup_IGNORE_PERM (1 << 1) -+#define AuLkup_DIRREN (1 << 2) -+#define au_ftest_lkup(flags, name) ((flags) & AuLkup_##name) -+#define au_fset_lkup(flags, name) \ -+ do { (flags) |= AuLkup_##name; } while (0) -+#define au_fclr_lkup(flags, name) \ -+ do { (flags) &= ~AuLkup_##name; } while (0) -+ -+#ifndef CONFIG_AUFS_DIRREN -+#undef AuLkup_DIRREN -+#define AuLkup_DIRREN 0 -+#endif -+ -+struct au_do_lookup_args { -+ unsigned int flags; -+ mode_t type; -+ struct qstr whname, *name; -+ struct au_dr_lookup dirren; -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* dentry.c */ -+extern const struct dentry_operations aufs_dop, aufs_dop_noreval; -+struct au_branch; -+struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent); -+int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir, -+ struct dentry *h_parent, struct au_branch *br); -+ -+int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t btop, -+ unsigned int flags); -+int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex, int wh); -+int au_refresh_dentry(struct dentry *dentry, struct dentry *parent); -+int au_reval_dpath(struct dentry *dentry, unsigned int sigen); -+void au_refresh_dop(struct dentry *dentry, int force_reval); -+ -+/* dinfo.c */ -+void au_di_init_once(void *_di); -+struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc); -+void au_di_free(struct au_dinfo *dinfo); -+void au_di_swap(struct au_dinfo *a, struct au_dinfo *b); -+void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src); -+int au_di_init(struct dentry *dentry); -+void au_di_fin(struct dentry *dentry); -+int au_di_realloc(struct au_dinfo *dinfo, int nbr, int may_shrink); -+ -+void di_read_lock(struct dentry *d, int flags, unsigned int lsc); -+void di_read_unlock(struct dentry *d, int flags); -+void di_downgrade_lock(struct dentry *d, int flags); -+void di_write_lock(struct dentry *d, unsigned int lsc); -+void di_write_unlock(struct dentry *d); -+void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir); -+void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir); -+void di_write_unlock2(struct dentry *d1, struct dentry *d2); -+ -+struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex); -+struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex); -+aufs_bindex_t au_dbtail(struct dentry *dentry); -+aufs_bindex_t au_dbtaildir(struct dentry *dentry); -+ -+void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex, -+ struct dentry *h_dentry); -+int au_digen_test(struct dentry *dentry, unsigned int sigen); -+int au_dbrange_test(struct dentry *dentry); -+void au_update_digen(struct dentry *dentry); -+void au_update_dbrange(struct dentry *dentry, int do_put_zero); -+void au_update_dbtop(struct dentry *dentry); -+void au_update_dbbot(struct dentry *dentry); -+int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry); -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline struct au_dinfo *au_di(struct dentry *dentry) -+{ -+ return dentry->d_fsdata; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* lock subclass for dinfo */ -+enum { -+ AuLsc_DI_CHILD, /* child first */ -+ AuLsc_DI_CHILD2, /* rename(2), link(2), and cpup at hnotify */ -+ AuLsc_DI_CHILD3, /* copyup dirs */ -+ AuLsc_DI_PARENT, -+ AuLsc_DI_PARENT2, -+ AuLsc_DI_PARENT3, -+ AuLsc_DI_TMP /* temp for replacing dinfo */ -+}; -+ -+/* -+ * di_read_lock_child, di_write_lock_child, -+ * di_read_lock_child2, di_write_lock_child2, -+ * di_read_lock_child3, di_write_lock_child3, -+ * di_read_lock_parent, di_write_lock_parent, -+ * di_read_lock_parent2, di_write_lock_parent2, -+ * di_read_lock_parent3, di_write_lock_parent3, -+ */ -+#define AuReadLockFunc(name, lsc) \ -+static inline void di_read_lock_##name(struct dentry *d, int flags) \ -+{ di_read_lock(d, flags, AuLsc_DI_##lsc); } -+ -+#define AuWriteLockFunc(name, lsc) \ -+static inline void di_write_lock_##name(struct dentry *d) \ -+{ di_write_lock(d, AuLsc_DI_##lsc); } -+ -+#define AuRWLockFuncs(name, lsc) \ -+ AuReadLockFunc(name, lsc) \ -+ AuWriteLockFunc(name, lsc) -+ -+AuRWLockFuncs(child, CHILD); -+AuRWLockFuncs(child2, CHILD2); -+AuRWLockFuncs(child3, CHILD3); -+AuRWLockFuncs(parent, PARENT); -+AuRWLockFuncs(parent2, PARENT2); -+AuRWLockFuncs(parent3, PARENT3); -+ -+#undef AuReadLockFunc -+#undef AuWriteLockFunc -+#undef AuRWLockFuncs -+ -+#define DiMustNoWaiters(d) AuRwMustNoWaiters(&au_di(d)->di_rwsem) -+#define DiMustAnyLock(d) AuRwMustAnyLock(&au_di(d)->di_rwsem) -+#define DiMustWriteLock(d) AuRwMustWriteLock(&au_di(d)->di_rwsem) -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* todo: memory barrier? */ -+static inline unsigned int au_digen(struct dentry *d) -+{ -+ return atomic_read(&au_di(d)->di_generation); -+} -+ -+static inline void au_h_dentry_init(struct au_hdentry *hdentry) -+{ -+ hdentry->hd_dentry = NULL; -+} -+ -+static inline struct au_hdentry *au_hdentry(struct au_dinfo *di, -+ aufs_bindex_t bindex) -+{ -+ return di->di_hdentry + bindex; -+} -+ -+static inline void au_hdput(struct au_hdentry *hd) -+{ -+ if (hd) -+ dput(hd->hd_dentry); -+} -+ -+static inline aufs_bindex_t au_dbtop(struct dentry *dentry) -+{ -+ DiMustAnyLock(dentry); -+ return au_di(dentry)->di_btop; -+} -+ -+static inline aufs_bindex_t au_dbbot(struct dentry *dentry) -+{ -+ DiMustAnyLock(dentry); -+ return au_di(dentry)->di_bbot; -+} -+ -+static inline aufs_bindex_t au_dbwh(struct dentry *dentry) -+{ -+ DiMustAnyLock(dentry); -+ return au_di(dentry)->di_bwh; -+} -+ -+static inline aufs_bindex_t au_dbdiropq(struct dentry *dentry) -+{ -+ DiMustAnyLock(dentry); -+ return au_di(dentry)->di_bdiropq; -+} -+ -+/* todo: hard/soft set? */ -+static inline void au_set_dbtop(struct dentry *dentry, aufs_bindex_t bindex) -+{ -+ DiMustWriteLock(dentry); -+ au_di(dentry)->di_btop = bindex; -+} -+ -+static inline void au_set_dbbot(struct dentry *dentry, aufs_bindex_t bindex) -+{ -+ DiMustWriteLock(dentry); -+ au_di(dentry)->di_bbot = bindex; -+} -+ -+static inline void au_set_dbwh(struct dentry *dentry, aufs_bindex_t bindex) -+{ -+ DiMustWriteLock(dentry); -+ /* dbwh can be outside of btop - bbot range */ -+ au_di(dentry)->di_bwh = bindex; -+} -+ -+static inline void au_set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex) -+{ -+ DiMustWriteLock(dentry); -+ au_di(dentry)->di_bdiropq = bindex; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+#ifdef CONFIG_AUFS_HNOTIFY -+static inline void au_digen_dec(struct dentry *d) -+{ -+ atomic_dec(&au_di(d)->di_generation); -+} -+ -+static inline void au_hn_di_reinit(struct dentry *dentry) -+{ -+ dentry->d_fsdata = NULL; -+} -+#else -+AuStubVoid(au_hn_di_reinit, struct dentry *dentry __maybe_unused) -+#endif /* CONFIG_AUFS_HNOTIFY */ -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_DENTRY_H__ */ -diff --git a/fs/aufs/dinfo.c b/fs/aufs/dinfo.c -new file mode 100644 -index 000000000000..86140548f046 ---- /dev/null -+++ b/fs/aufs/dinfo.c -@@ -0,0 +1,554 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * dentry private data -+ */ -+ -+#include "aufs.h" -+ -+void au_di_init_once(void *_dinfo) -+{ -+ struct au_dinfo *dinfo = _dinfo; -+ -+ au_rw_init(&dinfo->di_rwsem); -+} -+ -+struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc) -+{ -+ struct au_dinfo *dinfo; -+ int nbr, i; -+ -+ dinfo = au_cache_alloc_dinfo(); -+ if (unlikely(!dinfo)) -+ goto out; -+ -+ nbr = au_sbbot(sb) + 1; -+ if (nbr <= 0) -+ nbr = 1; -+ dinfo->di_hdentry = kcalloc(nbr, sizeof(*dinfo->di_hdentry), GFP_NOFS); -+ if (dinfo->di_hdentry) { -+ au_rw_write_lock_nested(&dinfo->di_rwsem, lsc); -+ dinfo->di_btop = -1; -+ dinfo->di_bbot = -1; -+ dinfo->di_bwh = -1; -+ dinfo->di_bdiropq = -1; -+ dinfo->di_tmpfile = 0; -+ for (i = 0; i < nbr; i++) -+ dinfo->di_hdentry[i].hd_id = -1; -+ goto out; -+ } -+ -+ au_cache_free_dinfo(dinfo); -+ dinfo = NULL; -+ -+out: -+ return dinfo; -+} -+ -+void au_di_free(struct au_dinfo *dinfo) -+{ -+ struct au_hdentry *p; -+ aufs_bindex_t bbot, bindex; -+ -+ /* dentry may not be revalidated */ -+ bindex = dinfo->di_btop; -+ if (bindex >= 0) { -+ bbot = dinfo->di_bbot; -+ p = au_hdentry(dinfo, bindex); -+ while (bindex++ <= bbot) -+ au_hdput(p++); -+ } -+ au_kfree_try_rcu(dinfo->di_hdentry); -+ au_cache_free_dinfo(dinfo); -+} -+ -+void au_di_swap(struct au_dinfo *a, struct au_dinfo *b) -+{ -+ struct au_hdentry *p; -+ aufs_bindex_t bi; -+ -+ AuRwMustWriteLock(&a->di_rwsem); -+ AuRwMustWriteLock(&b->di_rwsem); -+ -+#define DiSwap(v, name) \ -+ do { \ -+ v = a->di_##name; \ -+ a->di_##name = b->di_##name; \ -+ b->di_##name = v; \ -+ } while (0) -+ -+ DiSwap(p, hdentry); -+ DiSwap(bi, btop); -+ DiSwap(bi, bbot); -+ DiSwap(bi, bwh); -+ DiSwap(bi, bdiropq); -+ /* smp_mb(); */ -+ -+#undef DiSwap -+} -+ -+void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src) -+{ -+ AuRwMustWriteLock(&dst->di_rwsem); -+ AuRwMustWriteLock(&src->di_rwsem); -+ -+ dst->di_btop = src->di_btop; -+ dst->di_bbot = src->di_bbot; -+ dst->di_bwh = src->di_bwh; -+ dst->di_bdiropq = src->di_bdiropq; -+ /* smp_mb(); */ -+} -+ -+int au_di_init(struct dentry *dentry) -+{ -+ int err; -+ struct super_block *sb; -+ struct au_dinfo *dinfo; -+ -+ err = 0; -+ sb = dentry->d_sb; -+ dinfo = au_di_alloc(sb, AuLsc_DI_CHILD); -+ if (dinfo) { -+ atomic_set(&dinfo->di_generation, au_sigen(sb)); -+ /* smp_mb(); */ /* atomic_set */ -+ dentry->d_fsdata = dinfo; -+ } else -+ err = -ENOMEM; -+ -+ return err; -+} -+ -+void au_di_fin(struct dentry *dentry) -+{ -+ struct au_dinfo *dinfo; -+ -+ dinfo = au_di(dentry); -+ AuRwDestroy(&dinfo->di_rwsem); -+ au_di_free(dinfo); -+} -+ -+int au_di_realloc(struct au_dinfo *dinfo, int nbr, int may_shrink) -+{ -+ int err, sz; -+ struct au_hdentry *hdp; -+ -+ AuRwMustWriteLock(&dinfo->di_rwsem); -+ -+ err = -ENOMEM; -+ sz = sizeof(*hdp) * (dinfo->di_bbot + 1); -+ if (!sz) -+ sz = sizeof(*hdp); -+ hdp = au_kzrealloc(dinfo->di_hdentry, sz, sizeof(*hdp) * nbr, GFP_NOFS, -+ may_shrink); -+ if (hdp) { -+ dinfo->di_hdentry = hdp; -+ err = 0; -+ } -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static void do_ii_write_lock(struct inode *inode, unsigned int lsc) -+{ -+ switch (lsc) { -+ case AuLsc_DI_CHILD: -+ ii_write_lock_child(inode); -+ break; -+ case AuLsc_DI_CHILD2: -+ ii_write_lock_child2(inode); -+ break; -+ case AuLsc_DI_CHILD3: -+ ii_write_lock_child3(inode); -+ break; -+ case AuLsc_DI_PARENT: -+ ii_write_lock_parent(inode); -+ break; -+ case AuLsc_DI_PARENT2: -+ ii_write_lock_parent2(inode); -+ break; -+ case AuLsc_DI_PARENT3: -+ ii_write_lock_parent3(inode); -+ break; -+ default: -+ BUG(); -+ } -+} -+ -+static void do_ii_read_lock(struct inode *inode, unsigned int lsc) -+{ -+ switch (lsc) { -+ case AuLsc_DI_CHILD: -+ ii_read_lock_child(inode); -+ break; -+ case AuLsc_DI_CHILD2: -+ ii_read_lock_child2(inode); -+ break; -+ case AuLsc_DI_CHILD3: -+ ii_read_lock_child3(inode); -+ break; -+ case AuLsc_DI_PARENT: -+ ii_read_lock_parent(inode); -+ break; -+ case AuLsc_DI_PARENT2: -+ ii_read_lock_parent2(inode); -+ break; -+ case AuLsc_DI_PARENT3: -+ ii_read_lock_parent3(inode); -+ break; -+ default: -+ BUG(); -+ } -+} -+ -+void di_read_lock(struct dentry *d, int flags, unsigned int lsc) -+{ -+ struct inode *inode; -+ -+ au_rw_read_lock_nested(&au_di(d)->di_rwsem, lsc); -+ if (d_really_is_positive(d)) { -+ inode = d_inode(d); -+ if (au_ftest_lock(flags, IW)) -+ do_ii_write_lock(inode, lsc); -+ else if (au_ftest_lock(flags, IR)) -+ do_ii_read_lock(inode, lsc); -+ } -+} -+ -+void di_read_unlock(struct dentry *d, int flags) -+{ -+ struct inode *inode; -+ -+ if (d_really_is_positive(d)) { -+ inode = d_inode(d); -+ if (au_ftest_lock(flags, IW)) { -+ au_dbg_verify_dinode(d); -+ ii_write_unlock(inode); -+ } else if (au_ftest_lock(flags, IR)) { -+ au_dbg_verify_dinode(d); -+ ii_read_unlock(inode); -+ } -+ } -+ au_rw_read_unlock(&au_di(d)->di_rwsem); -+} -+ -+void di_downgrade_lock(struct dentry *d, int flags) -+{ -+ if (d_really_is_positive(d) && au_ftest_lock(flags, IR)) -+ ii_downgrade_lock(d_inode(d)); -+ au_rw_dgrade_lock(&au_di(d)->di_rwsem); -+} -+ -+void di_write_lock(struct dentry *d, unsigned int lsc) -+{ -+ au_rw_write_lock_nested(&au_di(d)->di_rwsem, lsc); -+ if (d_really_is_positive(d)) -+ do_ii_write_lock(d_inode(d), lsc); -+} -+ -+void di_write_unlock(struct dentry *d) -+{ -+ au_dbg_verify_dinode(d); -+ if (d_really_is_positive(d)) -+ ii_write_unlock(d_inode(d)); -+ au_rw_write_unlock(&au_di(d)->di_rwsem); -+} -+ -+void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir) -+{ -+ AuDebugOn(d1 == d2 -+ || d_inode(d1) == d_inode(d2) -+ || d1->d_sb != d2->d_sb); -+ -+ if ((isdir && au_test_subdir(d1, d2)) -+ || d1 < d2) { -+ di_write_lock_child(d1); -+ di_write_lock_child2(d2); -+ } else { -+ di_write_lock_child(d2); -+ di_write_lock_child2(d1); -+ } -+} -+ -+void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir) -+{ -+ AuDebugOn(d1 == d2 -+ || d_inode(d1) == d_inode(d2) -+ || d1->d_sb != d2->d_sb); -+ -+ if ((isdir && au_test_subdir(d1, d2)) -+ || d1 < d2) { -+ di_write_lock_parent(d1); -+ di_write_lock_parent2(d2); -+ } else { -+ di_write_lock_parent(d2); -+ di_write_lock_parent2(d1); -+ } -+} -+ -+void di_write_unlock2(struct dentry *d1, struct dentry *d2) -+{ -+ di_write_unlock(d1); -+ if (d_inode(d1) == d_inode(d2)) -+ au_rw_write_unlock(&au_di(d2)->di_rwsem); -+ else -+ di_write_unlock(d2); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex) -+{ -+ struct dentry *d; -+ -+ DiMustAnyLock(dentry); -+ -+ if (au_dbtop(dentry) < 0 || bindex < au_dbtop(dentry)) -+ return NULL; -+ AuDebugOn(bindex < 0); -+ d = au_hdentry(au_di(dentry), bindex)->hd_dentry; -+ AuDebugOn(d && au_dcount(d) <= 0); -+ return d; -+} -+ -+/* -+ * extended version of au_h_dptr(). -+ * returns a hashed and positive (or linkable) h_dentry in bindex, NULL, or -+ * error. -+ */ -+struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex) -+{ -+ struct dentry *h_dentry; -+ struct inode *inode, *h_inode; -+ -+ AuDebugOn(d_really_is_negative(dentry)); -+ -+ h_dentry = NULL; -+ if (au_dbtop(dentry) <= bindex -+ && bindex <= au_dbbot(dentry)) -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (h_dentry && !au_d_linkable(h_dentry)) { -+ dget(h_dentry); -+ goto out; /* success */ -+ } -+ -+ inode = d_inode(dentry); -+ AuDebugOn(bindex < au_ibtop(inode)); -+ AuDebugOn(au_ibbot(inode) < bindex); -+ h_inode = au_h_iptr(inode, bindex); -+ h_dentry = d_find_alias(h_inode); -+ if (h_dentry) { -+ if (!IS_ERR(h_dentry)) { -+ if (!au_d_linkable(h_dentry)) -+ goto out; /* success */ -+ dput(h_dentry); -+ } else -+ goto out; -+ } -+ -+ if (au_opt_test(au_mntflags(dentry->d_sb), PLINK)) { -+ h_dentry = au_plink_lkup(inode, bindex); -+ AuDebugOn(!h_dentry); -+ if (!IS_ERR(h_dentry)) { -+ if (!au_d_hashed_positive(h_dentry)) -+ goto out; /* success */ -+ dput(h_dentry); -+ h_dentry = NULL; -+ } -+ } -+ -+out: -+ AuDbgDentry(h_dentry); -+ return h_dentry; -+} -+ -+aufs_bindex_t au_dbtail(struct dentry *dentry) -+{ -+ aufs_bindex_t bbot, bwh; -+ -+ bbot = au_dbbot(dentry); -+ if (0 <= bbot) { -+ bwh = au_dbwh(dentry); -+ if (!bwh) -+ return bwh; -+ if (0 < bwh && bwh < bbot) -+ return bwh - 1; -+ } -+ return bbot; -+} -+ -+aufs_bindex_t au_dbtaildir(struct dentry *dentry) -+{ -+ aufs_bindex_t bbot, bopq; -+ -+ bbot = au_dbtail(dentry); -+ if (0 <= bbot) { -+ bopq = au_dbdiropq(dentry); -+ if (0 <= bopq && bopq < bbot) -+ bbot = bopq; -+ } -+ return bbot; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex, -+ struct dentry *h_dentry) -+{ -+ struct au_dinfo *dinfo; -+ struct au_hdentry *hd; -+ struct au_branch *br; -+ -+ DiMustWriteLock(dentry); -+ -+ dinfo = au_di(dentry); -+ hd = au_hdentry(dinfo, bindex); -+ au_hdput(hd); -+ hd->hd_dentry = h_dentry; -+ if (h_dentry) { -+ br = au_sbr(dentry->d_sb, bindex); -+ hd->hd_id = br->br_id; -+ } -+} -+ -+int au_dbrange_test(struct dentry *dentry) -+{ -+ int err; -+ aufs_bindex_t btop, bbot; -+ -+ err = 0; -+ btop = au_dbtop(dentry); -+ bbot = au_dbbot(dentry); -+ if (btop >= 0) -+ AuDebugOn(bbot < 0 && btop > bbot); -+ else { -+ err = -EIO; -+ AuDebugOn(bbot >= 0); -+ } -+ -+ return err; -+} -+ -+int au_digen_test(struct dentry *dentry, unsigned int sigen) -+{ -+ int err; -+ -+ err = 0; -+ if (unlikely(au_digen(dentry) != sigen -+ || au_iigen_test(d_inode(dentry), sigen))) -+ err = -EIO; -+ -+ return err; -+} -+ -+void au_update_digen(struct dentry *dentry) -+{ -+ atomic_set(&au_di(dentry)->di_generation, au_sigen(dentry->d_sb)); -+ /* smp_mb(); */ /* atomic_set */ -+} -+ -+void au_update_dbrange(struct dentry *dentry, int do_put_zero) -+{ -+ struct au_dinfo *dinfo; -+ struct dentry *h_d; -+ struct au_hdentry *hdp; -+ aufs_bindex_t bindex, bbot; -+ -+ DiMustWriteLock(dentry); -+ -+ dinfo = au_di(dentry); -+ if (!dinfo || dinfo->di_btop < 0) -+ return; -+ -+ if (do_put_zero) { -+ bbot = dinfo->di_bbot; -+ bindex = dinfo->di_btop; -+ hdp = au_hdentry(dinfo, bindex); -+ for (; bindex <= bbot; bindex++, hdp++) { -+ h_d = hdp->hd_dentry; -+ if (h_d && d_is_negative(h_d)) -+ au_set_h_dptr(dentry, bindex, NULL); -+ } -+ } -+ -+ dinfo->di_btop = 0; -+ hdp = au_hdentry(dinfo, dinfo->di_btop); -+ for (; dinfo->di_btop <= dinfo->di_bbot; dinfo->di_btop++, hdp++) -+ if (hdp->hd_dentry) -+ break; -+ if (dinfo->di_btop > dinfo->di_bbot) { -+ dinfo->di_btop = -1; -+ dinfo->di_bbot = -1; -+ return; -+ } -+ -+ hdp = au_hdentry(dinfo, dinfo->di_bbot); -+ for (; dinfo->di_bbot >= 0; dinfo->di_bbot--, hdp--) -+ if (hdp->hd_dentry) -+ break; -+ AuDebugOn(dinfo->di_btop > dinfo->di_bbot || dinfo->di_bbot < 0); -+} -+ -+void au_update_dbtop(struct dentry *dentry) -+{ -+ aufs_bindex_t bindex, bbot; -+ struct dentry *h_dentry; -+ -+ bbot = au_dbbot(dentry); -+ for (bindex = au_dbtop(dentry); bindex <= bbot; bindex++) { -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (!h_dentry) -+ continue; -+ if (d_is_positive(h_dentry)) { -+ au_set_dbtop(dentry, bindex); -+ return; -+ } -+ au_set_h_dptr(dentry, bindex, NULL); -+ } -+} -+ -+void au_update_dbbot(struct dentry *dentry) -+{ -+ aufs_bindex_t bindex, btop; -+ struct dentry *h_dentry; -+ -+ btop = au_dbtop(dentry); -+ for (bindex = au_dbbot(dentry); bindex >= btop; bindex--) { -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (!h_dentry) -+ continue; -+ if (d_is_positive(h_dentry)) { -+ au_set_dbbot(dentry, bindex); -+ return; -+ } -+ au_set_h_dptr(dentry, bindex, NULL); -+ } -+} -+ -+int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry) -+{ -+ aufs_bindex_t bindex, bbot; -+ -+ bbot = au_dbbot(dentry); -+ for (bindex = au_dbtop(dentry); bindex <= bbot; bindex++) -+ if (au_h_dptr(dentry, bindex) == h_dentry) -+ return bindex; -+ return -1; -+} -diff --git a/fs/aufs/dir.c b/fs/aufs/dir.c -new file mode 100644 -index 000000000000..68e87d6f287e ---- /dev/null -+++ b/fs/aufs/dir.c -@@ -0,0 +1,763 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * directory operations -+ */ -+ -+#include <linux/fs_stack.h> -+#include <linux/iversion.h> -+#include "aufs.h" -+ -+void au_add_nlink(struct inode *dir, struct inode *h_dir) -+{ -+ unsigned int nlink; -+ -+ AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode)); -+ -+ nlink = dir->i_nlink; -+ nlink += h_dir->i_nlink - 2; -+ if (h_dir->i_nlink < 2) -+ nlink += 2; -+ smp_mb(); /* for i_nlink */ -+ /* 0 can happen in revaliding */ -+ set_nlink(dir, nlink); -+} -+ -+void au_sub_nlink(struct inode *dir, struct inode *h_dir) -+{ -+ unsigned int nlink; -+ -+ AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode)); -+ -+ nlink = dir->i_nlink; -+ nlink -= h_dir->i_nlink - 2; -+ if (h_dir->i_nlink < 2) -+ nlink -= 2; -+ smp_mb(); /* for i_nlink */ -+ /* nlink == 0 means the branch-fs is broken */ -+ set_nlink(dir, nlink); -+} -+ -+loff_t au_dir_size(struct file *file, struct dentry *dentry) -+{ -+ loff_t sz; -+ aufs_bindex_t bindex, bbot; -+ struct file *h_file; -+ struct dentry *h_dentry; -+ -+ sz = 0; -+ if (file) { -+ AuDebugOn(!d_is_dir(file->f_path.dentry)); -+ -+ bbot = au_fbbot_dir(file); -+ for (bindex = au_fbtop(file); -+ bindex <= bbot && sz < KMALLOC_MAX_SIZE; -+ bindex++) { -+ h_file = au_hf_dir(file, bindex); -+ if (h_file && file_inode(h_file)) -+ sz += vfsub_f_size_read(h_file); -+ } -+ } else { -+ AuDebugOn(!dentry); -+ AuDebugOn(!d_is_dir(dentry)); -+ -+ bbot = au_dbtaildir(dentry); -+ for (bindex = au_dbtop(dentry); -+ bindex <= bbot && sz < KMALLOC_MAX_SIZE; -+ bindex++) { -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (h_dentry && d_is_positive(h_dentry)) -+ sz += i_size_read(d_inode(h_dentry)); -+ } -+ } -+ if (sz < KMALLOC_MAX_SIZE) -+ sz = roundup_pow_of_two(sz); -+ if (sz > KMALLOC_MAX_SIZE) -+ sz = KMALLOC_MAX_SIZE; -+ else if (sz < NAME_MAX) { -+ BUILD_BUG_ON(AUFS_RDBLK_DEF < NAME_MAX); -+ sz = AUFS_RDBLK_DEF; -+ } -+ return sz; -+} -+ -+struct au_dir_ts_arg { -+ struct dentry *dentry; -+ aufs_bindex_t brid; -+}; -+ -+static void au_do_dir_ts(void *arg) -+{ -+ struct au_dir_ts_arg *a = arg; -+ struct au_dtime dt; -+ struct path h_path; -+ struct inode *dir, *h_dir; -+ struct super_block *sb; -+ struct au_branch *br; -+ struct au_hinode *hdir; -+ int err; -+ aufs_bindex_t btop, bindex; -+ -+ sb = a->dentry->d_sb; -+ if (d_really_is_negative(a->dentry)) -+ goto out; -+ /* no dir->i_mutex lock */ -+ aufs_read_lock(a->dentry, AuLock_DW); /* noflush */ -+ -+ dir = d_inode(a->dentry); -+ btop = au_ibtop(dir); -+ bindex = au_br_index(sb, a->brid); -+ if (bindex < btop) -+ goto out_unlock; -+ -+ br = au_sbr(sb, bindex); -+ h_path.dentry = au_h_dptr(a->dentry, bindex); -+ if (!h_path.dentry) -+ goto out_unlock; -+ h_path.mnt = au_br_mnt(br); -+ au_dtime_store(&dt, a->dentry, &h_path); -+ -+ br = au_sbr(sb, btop); -+ if (!au_br_writable(br->br_perm)) -+ goto out_unlock; -+ h_path.dentry = au_h_dptr(a->dentry, btop); -+ h_path.mnt = au_br_mnt(br); -+ err = vfsub_mnt_want_write(h_path.mnt); -+ if (err) -+ goto out_unlock; -+ hdir = au_hi(dir, btop); -+ au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); -+ h_dir = au_h_iptr(dir, btop); -+ if (h_dir->i_nlink -+ && timespec64_compare(&h_dir->i_mtime, &dt.dt_mtime) < 0) { -+ dt.dt_h_path = h_path; -+ au_dtime_revert(&dt); -+ } -+ au_hn_inode_unlock(hdir); -+ vfsub_mnt_drop_write(h_path.mnt); -+ au_cpup_attr_timesizes(dir); -+ -+out_unlock: -+ aufs_read_unlock(a->dentry, AuLock_DW); -+out: -+ dput(a->dentry); -+ au_nwt_done(&au_sbi(sb)->si_nowait); -+ au_kfree_try_rcu(arg); -+} -+ -+void au_dir_ts(struct inode *dir, aufs_bindex_t bindex) -+{ -+ int perm, wkq_err; -+ aufs_bindex_t btop; -+ struct au_dir_ts_arg *arg; -+ struct dentry *dentry; -+ struct super_block *sb; -+ -+ IMustLock(dir); -+ -+ dentry = d_find_any_alias(dir); -+ AuDebugOn(!dentry); -+ sb = dentry->d_sb; -+ btop = au_ibtop(dir); -+ if (btop == bindex) { -+ au_cpup_attr_timesizes(dir); -+ goto out; -+ } -+ -+ perm = au_sbr_perm(sb, btop); -+ if (!au_br_writable(perm)) -+ goto out; -+ -+ arg = kmalloc(sizeof(*arg), GFP_NOFS); -+ if (!arg) -+ goto out; -+ -+ arg->dentry = dget(dentry); /* will be dput-ted by au_do_dir_ts() */ -+ arg->brid = au_sbr_id(sb, bindex); -+ wkq_err = au_wkq_nowait(au_do_dir_ts, arg, sb, /*flags*/0); -+ if (unlikely(wkq_err)) { -+ pr_err("wkq %d\n", wkq_err); -+ dput(dentry); -+ au_kfree_try_rcu(arg); -+ } -+ -+out: -+ dput(dentry); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int reopen_dir(struct file *file) -+{ -+ int err; -+ unsigned int flags; -+ aufs_bindex_t bindex, btail, btop; -+ struct dentry *dentry, *h_dentry; -+ struct file *h_file; -+ -+ /* open all lower dirs */ -+ dentry = file->f_path.dentry; -+ btop = au_dbtop(dentry); -+ for (bindex = au_fbtop(file); bindex < btop; bindex++) -+ au_set_h_fptr(file, bindex, NULL); -+ au_set_fbtop(file, btop); -+ -+ btail = au_dbtaildir(dentry); -+ for (bindex = au_fbbot_dir(file); btail < bindex; bindex--) -+ au_set_h_fptr(file, bindex, NULL); -+ au_set_fbbot_dir(file, btail); -+ -+ flags = vfsub_file_flags(file); -+ for (bindex = btop; bindex <= btail; bindex++) { -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (!h_dentry) -+ continue; -+ h_file = au_hf_dir(file, bindex); -+ if (h_file) -+ continue; -+ -+ h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out; /* close all? */ -+ au_set_h_fptr(file, bindex, h_file); -+ } -+ au_update_figen(file); -+ /* todo: necessary? */ -+ /* file->f_ra = h_file->f_ra; */ -+ err = 0; -+ -+out: -+ return err; -+} -+ -+static int do_open_dir(struct file *file, int flags, struct file *h_file) -+{ -+ int err; -+ aufs_bindex_t bindex, btail; -+ struct dentry *dentry, *h_dentry; -+ struct vfsmount *mnt; -+ -+ FiMustWriteLock(file); -+ AuDebugOn(h_file); -+ -+ err = 0; -+ mnt = file->f_path.mnt; -+ dentry = file->f_path.dentry; -+ file->f_version = inode_query_iversion(d_inode(dentry)); -+ bindex = au_dbtop(dentry); -+ au_set_fbtop(file, bindex); -+ btail = au_dbtaildir(dentry); -+ au_set_fbbot_dir(file, btail); -+ for (; !err && bindex <= btail; bindex++) { -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (!h_dentry) -+ continue; -+ -+ err = vfsub_test_mntns(mnt, h_dentry->d_sb); -+ if (unlikely(err)) -+ break; -+ h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0); -+ if (IS_ERR(h_file)) { -+ err = PTR_ERR(h_file); -+ break; -+ } -+ au_set_h_fptr(file, bindex, h_file); -+ } -+ au_update_figen(file); -+ /* todo: necessary? */ -+ /* file->f_ra = h_file->f_ra; */ -+ if (!err) -+ return 0; /* success */ -+ -+ /* close all */ -+ for (bindex = au_fbtop(file); bindex <= btail; bindex++) -+ au_set_h_fptr(file, bindex, NULL); -+ au_set_fbtop(file, -1); -+ au_set_fbbot_dir(file, -1); -+ -+ return err; -+} -+ -+static int aufs_open_dir(struct inode *inode __maybe_unused, -+ struct file *file) -+{ -+ int err; -+ struct super_block *sb; -+ struct au_fidir *fidir; -+ -+ err = -ENOMEM; -+ sb = file->f_path.dentry->d_sb; -+ si_read_lock(sb, AuLock_FLUSH); -+ fidir = au_fidir_alloc(sb); -+ if (fidir) { -+ struct au_do_open_args args = { -+ .open = do_open_dir, -+ .fidir = fidir -+ }; -+ err = au_do_open(file, &args); -+ if (unlikely(err)) -+ au_kfree_rcu(fidir); -+ } -+ si_read_unlock(sb); -+ return err; -+} -+ -+static int aufs_release_dir(struct inode *inode __maybe_unused, -+ struct file *file) -+{ -+ struct au_vdir *vdir_cache; -+ struct au_finfo *finfo; -+ struct au_fidir *fidir; -+ struct au_hfile *hf; -+ aufs_bindex_t bindex, bbot; -+ -+ finfo = au_fi(file); -+ fidir = finfo->fi_hdir; -+ if (fidir) { -+ au_hbl_del(&finfo->fi_hlist, -+ &au_sbi(file->f_path.dentry->d_sb)->si_files); -+ vdir_cache = fidir->fd_vdir_cache; /* lock-free */ -+ if (vdir_cache) -+ au_vdir_free(vdir_cache); -+ -+ bindex = finfo->fi_btop; -+ if (bindex >= 0) { -+ hf = fidir->fd_hfile + bindex; -+ /* -+ * calls fput() instead of filp_close(), -+ * since no dnotify or lock for the lower file. -+ */ -+ bbot = fidir->fd_bbot; -+ for (; bindex <= bbot; bindex++, hf++) -+ if (hf->hf_file) -+ au_hfput(hf, /*execed*/0); -+ } -+ au_kfree_rcu(fidir); -+ finfo->fi_hdir = NULL; -+ } -+ au_finfo_fin(file); -+ return 0; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_do_flush_dir(struct file *file, fl_owner_t id) -+{ -+ int err; -+ aufs_bindex_t bindex, bbot; -+ struct file *h_file; -+ -+ err = 0; -+ bbot = au_fbbot_dir(file); -+ for (bindex = au_fbtop(file); !err && bindex <= bbot; bindex++) { -+ h_file = au_hf_dir(file, bindex); -+ if (h_file) -+ err = vfsub_flush(h_file, id); -+ } -+ return err; -+} -+ -+static int aufs_flush_dir(struct file *file, fl_owner_t id) -+{ -+ return au_do_flush(file, id, au_do_flush_dir); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_do_fsync_dir_no_file(struct dentry *dentry, int datasync) -+{ -+ int err; -+ aufs_bindex_t bbot, bindex; -+ struct inode *inode; -+ struct super_block *sb; -+ -+ err = 0; -+ sb = dentry->d_sb; -+ inode = d_inode(dentry); -+ IMustLock(inode); -+ bbot = au_dbbot(dentry); -+ for (bindex = au_dbtop(dentry); !err && bindex <= bbot; bindex++) { -+ struct path h_path; -+ -+ if (au_test_ro(sb, bindex, inode)) -+ continue; -+ h_path.dentry = au_h_dptr(dentry, bindex); -+ if (!h_path.dentry) -+ continue; -+ -+ h_path.mnt = au_sbr_mnt(sb, bindex); -+ err = vfsub_fsync(NULL, &h_path, datasync); -+ } -+ -+ return err; -+} -+ -+static int au_do_fsync_dir(struct file *file, int datasync) -+{ -+ int err; -+ aufs_bindex_t bbot, bindex; -+ struct file *h_file; -+ struct super_block *sb; -+ struct inode *inode; -+ -+ err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1, /*fi_lsc*/0); -+ if (unlikely(err)) -+ goto out; -+ -+ inode = file_inode(file); -+ sb = inode->i_sb; -+ bbot = au_fbbot_dir(file); -+ for (bindex = au_fbtop(file); !err && bindex <= bbot; bindex++) { -+ h_file = au_hf_dir(file, bindex); -+ if (!h_file || au_test_ro(sb, bindex, inode)) -+ continue; -+ -+ err = vfsub_fsync(h_file, &h_file->f_path, datasync); -+ } -+ -+out: -+ return err; -+} -+ -+/* -+ * @file may be NULL -+ */ -+static int aufs_fsync_dir(struct file *file, loff_t start, loff_t end, -+ int datasync) -+{ -+ int err; -+ struct dentry *dentry; -+ struct inode *inode; -+ struct super_block *sb; -+ -+ err = 0; -+ dentry = file->f_path.dentry; -+ inode = d_inode(dentry); -+ inode_lock(inode); -+ sb = dentry->d_sb; -+ si_noflush_read_lock(sb); -+ if (file) -+ err = au_do_fsync_dir(file, datasync); -+ else { -+ di_write_lock_child(dentry); -+ err = au_do_fsync_dir_no_file(dentry, datasync); -+ } -+ au_cpup_attr_timesizes(inode); -+ di_write_unlock(dentry); -+ if (file) -+ fi_write_unlock(file); -+ -+ si_read_unlock(sb); -+ inode_unlock(inode); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int aufs_iterate_shared(struct file *file, struct dir_context *ctx) -+{ -+ int err; -+ struct dentry *dentry; -+ struct inode *inode, *h_inode; -+ struct super_block *sb; -+ -+ AuDbg("%pD, ctx{%ps, %llu}\n", file, ctx->actor, ctx->pos); -+ -+ dentry = file->f_path.dentry; -+ inode = d_inode(dentry); -+ IMustLock(inode); -+ -+ sb = dentry->d_sb; -+ si_read_lock(sb, AuLock_FLUSH); -+ err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1, /*fi_lsc*/0); -+ if (unlikely(err)) -+ goto out; -+ err = au_alive_dir(dentry); -+ if (!err) -+ err = au_vdir_init(file); -+ di_downgrade_lock(dentry, AuLock_IR); -+ if (unlikely(err)) -+ goto out_unlock; -+ -+ h_inode = au_h_iptr(inode, au_ibtop(inode)); -+ if (!au_test_nfsd()) { -+ err = au_vdir_fill_de(file, ctx); -+ fsstack_copy_attr_atime(inode, h_inode); -+ } else { -+ /* -+ * nfsd filldir may call lookup_one_len(), vfs_getattr(), -+ * encode_fh() and others. -+ */ -+ atomic_inc(&h_inode->i_count); -+ di_read_unlock(dentry, AuLock_IR); -+ si_read_unlock(sb); -+ err = au_vdir_fill_de(file, ctx); -+ fsstack_copy_attr_atime(inode, h_inode); -+ fi_write_unlock(file); -+ iput(h_inode); -+ -+ AuTraceErr(err); -+ return err; -+ } -+ -+out_unlock: -+ di_read_unlock(dentry, AuLock_IR); -+ fi_write_unlock(file); -+out: -+ si_read_unlock(sb); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+#define AuTestEmpty_WHONLY 1 -+#define AuTestEmpty_CALLED (1 << 1) -+#define AuTestEmpty_SHWH (1 << 2) -+#define au_ftest_testempty(flags, name) ((flags) & AuTestEmpty_##name) -+#define au_fset_testempty(flags, name) \ -+ do { (flags) |= AuTestEmpty_##name; } while (0) -+#define au_fclr_testempty(flags, name) \ -+ do { (flags) &= ~AuTestEmpty_##name; } while (0) -+ -+#ifndef CONFIG_AUFS_SHWH -+#undef AuTestEmpty_SHWH -+#define AuTestEmpty_SHWH 0 -+#endif -+ -+struct test_empty_arg { -+ struct dir_context ctx; -+ struct au_nhash *whlist; -+ unsigned int flags; -+ int err; -+ aufs_bindex_t bindex; -+}; -+ -+static int test_empty_cb(struct dir_context *ctx, const char *__name, -+ int namelen, loff_t offset __maybe_unused, u64 ino, -+ unsigned int d_type) -+{ -+ struct test_empty_arg *arg = container_of(ctx, struct test_empty_arg, -+ ctx); -+ char *name = (void *)__name; -+ -+ arg->err = 0; -+ au_fset_testempty(arg->flags, CALLED); -+ /* smp_mb(); */ -+ if (name[0] == '.' -+ && (namelen == 1 || (name[1] == '.' && namelen == 2))) -+ goto out; /* success */ -+ -+ if (namelen <= AUFS_WH_PFX_LEN -+ || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { -+ if (au_ftest_testempty(arg->flags, WHONLY) -+ && !au_nhash_test_known_wh(arg->whlist, name, namelen)) -+ arg->err = -ENOTEMPTY; -+ goto out; -+ } -+ -+ name += AUFS_WH_PFX_LEN; -+ namelen -= AUFS_WH_PFX_LEN; -+ if (!au_nhash_test_known_wh(arg->whlist, name, namelen)) -+ arg->err = au_nhash_append_wh -+ (arg->whlist, name, namelen, ino, d_type, arg->bindex, -+ au_ftest_testempty(arg->flags, SHWH)); -+ -+out: -+ /* smp_mb(); */ -+ AuTraceErr(arg->err); -+ return arg->err; -+} -+ -+static int do_test_empty(struct dentry *dentry, struct test_empty_arg *arg) -+{ -+ int err; -+ struct file *h_file; -+ struct au_branch *br; -+ -+ h_file = au_h_open(dentry, arg->bindex, -+ O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_LARGEFILE, -+ /*file*/NULL, /*force_wr*/0); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out; -+ -+ err = 0; -+ if (!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE) -+ && !file_inode(h_file)->i_nlink) -+ goto out_put; -+ -+ do { -+ arg->err = 0; -+ au_fclr_testempty(arg->flags, CALLED); -+ /* smp_mb(); */ -+ err = vfsub_iterate_dir(h_file, &arg->ctx); -+ if (err >= 0) -+ err = arg->err; -+ } while (!err && au_ftest_testempty(arg->flags, CALLED)); -+ -+out_put: -+ fput(h_file); -+ br = au_sbr(dentry->d_sb, arg->bindex); -+ au_lcnt_dec(&br->br_nfiles); -+out: -+ return err; -+} -+ -+struct do_test_empty_args { -+ int *errp; -+ struct dentry *dentry; -+ struct test_empty_arg *arg; -+}; -+ -+static void call_do_test_empty(void *args) -+{ -+ struct do_test_empty_args *a = args; -+ *a->errp = do_test_empty(a->dentry, a->arg); -+} -+ -+static int sio_test_empty(struct dentry *dentry, struct test_empty_arg *arg) -+{ -+ int err, wkq_err; -+ struct dentry *h_dentry; -+ struct inode *h_inode; -+ -+ h_dentry = au_h_dptr(dentry, arg->bindex); -+ h_inode = d_inode(h_dentry); -+ /* todo: i_mode changes anytime? */ -+ inode_lock_shared_nested(h_inode, AuLsc_I_CHILD); -+ err = au_test_h_perm_sio(h_inode, MAY_EXEC | MAY_READ); -+ inode_unlock_shared(h_inode); -+ if (!err) -+ err = do_test_empty(dentry, arg); -+ else { -+ struct do_test_empty_args args = { -+ .errp = &err, -+ .dentry = dentry, -+ .arg = arg -+ }; -+ unsigned int flags = arg->flags; -+ -+ wkq_err = au_wkq_wait(call_do_test_empty, &args); -+ if (unlikely(wkq_err)) -+ err = wkq_err; -+ arg->flags = flags; -+ } -+ -+ return err; -+} -+ -+int au_test_empty_lower(struct dentry *dentry) -+{ -+ int err; -+ unsigned int rdhash; -+ aufs_bindex_t bindex, btop, btail; -+ struct au_nhash whlist; -+ struct test_empty_arg arg = { -+ .ctx = { -+ .actor = test_empty_cb -+ } -+ }; -+ int (*test_empty)(struct dentry *dentry, struct test_empty_arg *arg); -+ -+ SiMustAnyLock(dentry->d_sb); -+ -+ rdhash = au_sbi(dentry->d_sb)->si_rdhash; -+ if (!rdhash) -+ rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, dentry)); -+ err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS); -+ if (unlikely(err)) -+ goto out; -+ -+ arg.flags = 0; -+ arg.whlist = &whlist; -+ btop = au_dbtop(dentry); -+ if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)) -+ au_fset_testempty(arg.flags, SHWH); -+ test_empty = do_test_empty; -+ if (au_opt_test(au_mntflags(dentry->d_sb), DIRPERM1)) -+ test_empty = sio_test_empty; -+ arg.bindex = btop; -+ err = test_empty(dentry, &arg); -+ if (unlikely(err)) -+ goto out_whlist; -+ -+ au_fset_testempty(arg.flags, WHONLY); -+ btail = au_dbtaildir(dentry); -+ for (bindex = btop + 1; !err && bindex <= btail; bindex++) { -+ struct dentry *h_dentry; -+ -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (h_dentry && d_is_positive(h_dentry)) { -+ arg.bindex = bindex; -+ err = test_empty(dentry, &arg); -+ } -+ } -+ -+out_whlist: -+ au_nhash_wh_free(&whlist); -+out: -+ return err; -+} -+ -+int au_test_empty(struct dentry *dentry, struct au_nhash *whlist) -+{ -+ int err; -+ struct test_empty_arg arg = { -+ .ctx = { -+ .actor = test_empty_cb -+ } -+ }; -+ aufs_bindex_t bindex, btail; -+ -+ err = 0; -+ arg.whlist = whlist; -+ arg.flags = AuTestEmpty_WHONLY; -+ if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)) -+ au_fset_testempty(arg.flags, SHWH); -+ btail = au_dbtaildir(dentry); -+ for (bindex = au_dbtop(dentry); !err && bindex <= btail; bindex++) { -+ struct dentry *h_dentry; -+ -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (h_dentry && d_is_positive(h_dentry)) { -+ arg.bindex = bindex; -+ err = sio_test_empty(dentry, &arg); -+ } -+ } -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+const struct file_operations aufs_dir_fop = { -+ .owner = THIS_MODULE, -+ .llseek = default_llseek, -+ .read = generic_read_dir, -+ .iterate_shared = aufs_iterate_shared, -+ .unlocked_ioctl = aufs_ioctl_dir, -+#ifdef CONFIG_COMPAT -+ .compat_ioctl = aufs_compat_ioctl_dir, -+#endif -+ .open = aufs_open_dir, -+ .release = aufs_release_dir, -+ .flush = aufs_flush_dir, -+ .fsync = aufs_fsync_dir -+}; -diff --git a/fs/aufs/dir.h b/fs/aufs/dir.h -new file mode 100644 -index 000000000000..5c8065d258bf ---- /dev/null -+++ b/fs/aufs/dir.h -@@ -0,0 +1,134 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * directory operations -+ */ -+ -+#ifndef __AUFS_DIR_H__ -+#define __AUFS_DIR_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/fs.h> -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* need to be faster and smaller */ -+ -+struct au_nhash { -+ unsigned int nh_num; -+ struct hlist_head *nh_head; -+}; -+ -+struct au_vdir_destr { -+ unsigned char len; -+ unsigned char name[0]; -+} __packed; -+ -+struct au_vdir_dehstr { -+ struct hlist_node hash; -+ struct au_vdir_destr *str; -+ struct rcu_head rcu; -+} ____cacheline_aligned_in_smp; -+ -+struct au_vdir_de { -+ ino_t de_ino; -+ unsigned char de_type; -+ /* caution: packed */ -+ struct au_vdir_destr de_str; -+} __packed; -+ -+struct au_vdir_wh { -+ struct hlist_node wh_hash; -+#ifdef CONFIG_AUFS_SHWH -+ ino_t wh_ino; -+ aufs_bindex_t wh_bindex; -+ unsigned char wh_type; -+#else -+ aufs_bindex_t wh_bindex; -+#endif -+ /* caution: packed */ -+ struct au_vdir_destr wh_str; -+} __packed; -+ -+union au_vdir_deblk_p { -+ unsigned char *deblk; -+ struct au_vdir_de *de; -+}; -+ -+struct au_vdir { -+ unsigned char **vd_deblk; -+ unsigned long vd_nblk; -+ struct { -+ unsigned long ul; -+ union au_vdir_deblk_p p; -+ } vd_last; -+ -+ u64 vd_version; -+ unsigned int vd_deblk_sz; -+ unsigned long vd_jiffy; -+ struct rcu_head rcu; -+} ____cacheline_aligned_in_smp; -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* dir.c */ -+extern const struct file_operations aufs_dir_fop; -+void au_add_nlink(struct inode *dir, struct inode *h_dir); -+void au_sub_nlink(struct inode *dir, struct inode *h_dir); -+loff_t au_dir_size(struct file *file, struct dentry *dentry); -+void au_dir_ts(struct inode *dir, aufs_bindex_t bsrc); -+int au_test_empty_lower(struct dentry *dentry); -+int au_test_empty(struct dentry *dentry, struct au_nhash *whlist); -+ -+/* vdir.c */ -+unsigned int au_rdhash_est(loff_t sz); -+int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp); -+void au_nhash_wh_free(struct au_nhash *whlist); -+int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt, -+ int limit); -+int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen); -+int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino, -+ unsigned int d_type, aufs_bindex_t bindex, -+ unsigned char shwh); -+void au_vdir_free(struct au_vdir *vdir); -+int au_vdir_init(struct file *file); -+int au_vdir_fill_de(struct file *file, struct dir_context *ctx); -+ -+/* ioctl.c */ -+long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg); -+ -+#ifdef CONFIG_AUFS_RDU -+/* rdu.c */ -+long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg); -+#ifdef CONFIG_COMPAT -+long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, -+ unsigned long arg); -+#endif -+#else -+AuStub(long, au_rdu_ioctl, return -EINVAL, struct file *file, -+ unsigned int cmd, unsigned long arg) -+#ifdef CONFIG_COMPAT -+AuStub(long, au_rdu_compat_ioctl, return -EINVAL, struct file *file, -+ unsigned int cmd, unsigned long arg) -+#endif -+#endif -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_DIR_H__ */ -diff --git a/fs/aufs/dirren.c b/fs/aufs/dirren.c -new file mode 100644 -index 000000000000..0bd412ab68c9 ---- /dev/null -+++ b/fs/aufs/dirren.c -@@ -0,0 +1,1316 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2017-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * special handling in renaming a directory -+ * in order to support looking-up the before-renamed name on the lower readonly -+ * branches -+ */ -+ -+#include <linux/byteorder/generic.h> -+#include "aufs.h" -+ -+static void au_dr_hino_del(struct au_dr_br *dr, struct au_dr_hino *ent) -+{ -+ int idx; -+ -+ idx = au_dr_ihash(ent->dr_h_ino); -+ au_hbl_del(&ent->dr_hnode, dr->dr_h_ino + idx); -+} -+ -+static int au_dr_hino_test_empty(struct au_dr_br *dr) -+{ -+ int ret, i; -+ struct hlist_bl_head *hbl; -+ -+ ret = 1; -+ for (i = 0; ret && i < AuDirren_NHASH; i++) { -+ hbl = dr->dr_h_ino + i; -+ hlist_bl_lock(hbl); -+ ret &= hlist_bl_empty(hbl); -+ hlist_bl_unlock(hbl); -+ } -+ -+ return ret; -+} -+ -+static struct au_dr_hino *au_dr_hino_find(struct au_dr_br *dr, ino_t ino) -+{ -+ struct au_dr_hino *found, *ent; -+ struct hlist_bl_head *hbl; -+ struct hlist_bl_node *pos; -+ int idx; -+ -+ found = NULL; -+ idx = au_dr_ihash(ino); -+ hbl = dr->dr_h_ino + idx; -+ hlist_bl_lock(hbl); -+ hlist_bl_for_each_entry(ent, pos, hbl, dr_hnode) -+ if (ent->dr_h_ino == ino) { -+ found = ent; -+ break; -+ } -+ hlist_bl_unlock(hbl); -+ -+ return found; -+} -+ -+int au_dr_hino_test_add(struct au_dr_br *dr, ino_t ino, -+ struct au_dr_hino *add_ent) -+{ -+ int found, idx; -+ struct hlist_bl_head *hbl; -+ struct hlist_bl_node *pos; -+ struct au_dr_hino *ent; -+ -+ found = 0; -+ idx = au_dr_ihash(ino); -+ hbl = dr->dr_h_ino + idx; -+#if 0 -+ { -+ struct hlist_bl_node *tmp; -+ -+ hlist_bl_for_each_entry_safe(ent, pos, tmp, hbl, dr_hnode) -+ AuDbg("hi%llu\n", (unsigned long long)ent->dr_h_ino); -+ } -+#endif -+ hlist_bl_lock(hbl); -+ hlist_bl_for_each_entry(ent, pos, hbl, dr_hnode) -+ if (ent->dr_h_ino == ino) { -+ found = 1; -+ break; -+ } -+ if (!found && add_ent) -+ hlist_bl_add_head(&add_ent->dr_hnode, hbl); -+ hlist_bl_unlock(hbl); -+ -+ if (!found && add_ent) -+ AuDbg("i%llu added\n", (unsigned long long)add_ent->dr_h_ino); -+ -+ return found; -+} -+ -+void au_dr_hino_free(struct au_dr_br *dr) -+{ -+ int i; -+ struct hlist_bl_head *hbl; -+ struct hlist_bl_node *pos, *tmp; -+ struct au_dr_hino *ent; -+ -+ /* SiMustWriteLock(sb); */ -+ -+ for (i = 0; i < AuDirren_NHASH; i++) { -+ hbl = dr->dr_h_ino + i; -+ /* no spinlock since sbinfo must be write-locked */ -+ hlist_bl_for_each_entry_safe(ent, pos, tmp, hbl, dr_hnode) -+ au_kfree_rcu(ent); -+ INIT_HLIST_BL_HEAD(hbl); -+ } -+} -+ -+/* returns the number of inodes or an error */ -+static int au_dr_hino_store(struct super_block *sb, struct au_branch *br, -+ struct file *hinofile) -+{ -+ int err, i; -+ ssize_t ssz; -+ loff_t pos, oldsize; -+ __be64 u64; -+ struct inode *hinoinode; -+ struct hlist_bl_head *hbl; -+ struct hlist_bl_node *n1, *n2; -+ struct au_dr_hino *ent; -+ -+ SiMustWriteLock(sb); -+ AuDebugOn(!au_br_writable(br->br_perm)); -+ -+ hinoinode = file_inode(hinofile); -+ oldsize = i_size_read(hinoinode); -+ -+ err = 0; -+ pos = 0; -+ hbl = br->br_dirren.dr_h_ino; -+ for (i = 0; !err && i < AuDirren_NHASH; i++, hbl++) { -+ /* no bit-lock since sbinfo must be write-locked */ -+ hlist_bl_for_each_entry_safe(ent, n1, n2, hbl, dr_hnode) { -+ AuDbg("hi%llu, %pD2\n", -+ (unsigned long long)ent->dr_h_ino, hinofile); -+ u64 = cpu_to_be64(ent->dr_h_ino); -+ ssz = vfsub_write_k(hinofile, &u64, sizeof(u64), &pos); -+ if (ssz == sizeof(u64)) -+ continue; -+ -+ /* write error */ -+ pr_err("ssz %zd, %pD2\n", ssz, hinofile); -+ err = -ENOSPC; -+ if (ssz < 0) -+ err = ssz; -+ break; -+ } -+ } -+ /* regardless the error */ -+ if (pos < oldsize) { -+ err = vfsub_trunc(&hinofile->f_path, pos, /*attr*/0, hinofile); -+ AuTraceErr(err); -+ } -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+static int au_dr_hino_load(struct au_dr_br *dr, struct file *hinofile) -+{ -+ int err, hidx; -+ ssize_t ssz; -+ size_t sz, n; -+ loff_t pos; -+ uint64_t u64; -+ struct au_dr_hino *ent; -+ struct inode *hinoinode; -+ struct hlist_bl_head *hbl; -+ -+ err = 0; -+ pos = 0; -+ hbl = dr->dr_h_ino; -+ hinoinode = file_inode(hinofile); -+ sz = i_size_read(hinoinode); -+ AuDebugOn(sz % sizeof(u64)); -+ n = sz / sizeof(u64); -+ while (n--) { -+ ssz = vfsub_read_k(hinofile, &u64, sizeof(u64), &pos); -+ if (unlikely(ssz != sizeof(u64))) { -+ pr_err("ssz %zd, %pD2\n", ssz, hinofile); -+ err = -EINVAL; -+ if (ssz < 0) -+ err = ssz; -+ goto out_free; -+ } -+ -+ ent = kmalloc(sizeof(*ent), GFP_NOFS); -+ if (!ent) { -+ err = -ENOMEM; -+ AuTraceErr(err); -+ goto out_free; -+ } -+ ent->dr_h_ino = be64_to_cpu((__force __be64)u64); -+ AuDbg("hi%llu, %pD2\n", -+ (unsigned long long)ent->dr_h_ino, hinofile); -+ hidx = au_dr_ihash(ent->dr_h_ino); -+ au_hbl_add(&ent->dr_hnode, hbl + hidx); -+ } -+ goto out; /* success */ -+ -+out_free: -+ au_dr_hino_free(dr); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* -+ * @bindex/@br is a switch to distinguish whether suspending hnotify or not. -+ * @path is a switch to distinguish load and store. -+ */ -+static int au_dr_hino(struct super_block *sb, aufs_bindex_t bindex, -+ struct au_branch *br, const struct path *path) -+{ -+ int err, flags; -+ unsigned char load, suspend; -+ struct file *hinofile; -+ struct au_hinode *hdir; -+ struct inode *dir, *delegated; -+ struct path hinopath; -+ struct qstr hinoname = QSTR_INIT(AUFS_WH_DR_BRHINO, -+ sizeof(AUFS_WH_DR_BRHINO) - 1); -+ -+ AuDebugOn(bindex < 0 && !br); -+ AuDebugOn(bindex >= 0 && br); -+ -+ err = -EINVAL; -+ suspend = !br; -+ if (suspend) -+ br = au_sbr(sb, bindex); -+ load = !!path; -+ if (!load) { -+ path = &br->br_path; -+ AuDebugOn(!au_br_writable(br->br_perm)); -+ if (unlikely(!au_br_writable(br->br_perm))) -+ goto out; -+ } -+ -+ hdir = NULL; -+ if (suspend) { -+ dir = d_inode(sb->s_root); -+ hdir = au_hinode(au_ii(dir), bindex); -+ dir = hdir->hi_inode; -+ au_hn_inode_lock_nested(hdir, AuLsc_I_CHILD); -+ } else { -+ dir = d_inode(path->dentry); -+ inode_lock_nested(dir, AuLsc_I_CHILD); -+ } -+ hinopath.dentry = vfsub_lkup_one(&hinoname, path->dentry); -+ err = PTR_ERR(hinopath.dentry); -+ if (IS_ERR(hinopath.dentry)) -+ goto out_unlock; -+ -+ err = 0; -+ flags = O_RDONLY; -+ if (load) { -+ if (d_is_negative(hinopath.dentry)) -+ goto out_dput; /* success */ -+ } else { -+ if (au_dr_hino_test_empty(&br->br_dirren)) { -+ if (d_is_positive(hinopath.dentry)) { -+ delegated = NULL; -+ err = vfsub_unlink(dir, &hinopath, &delegated, -+ /*force*/0); -+ AuTraceErr(err); -+ if (unlikely(err)) -+ pr_err("ignored err %d, %pd2\n", -+ err, hinopath.dentry); -+ if (unlikely(err == -EWOULDBLOCK)) -+ iput(delegated); -+ err = 0; -+ } -+ goto out_dput; -+ } else if (!d_is_positive(hinopath.dentry)) { -+ err = vfsub_create(dir, &hinopath, 0600, -+ /*want_excl*/false); -+ AuTraceErr(err); -+ if (unlikely(err)) -+ goto out_dput; -+ } -+ flags = O_WRONLY; -+ } -+ hinopath.mnt = path->mnt; -+ hinofile = vfsub_dentry_open(&hinopath, flags); -+ if (suspend) -+ au_hn_inode_unlock(hdir); -+ else -+ inode_unlock(dir); -+ dput(hinopath.dentry); -+ AuTraceErrPtr(hinofile); -+ if (IS_ERR(hinofile)) { -+ err = PTR_ERR(hinofile); -+ goto out; -+ } -+ -+ if (load) -+ err = au_dr_hino_load(&br->br_dirren, hinofile); -+ else -+ err = au_dr_hino_store(sb, br, hinofile); -+ fput(hinofile); -+ goto out; -+ -+out_dput: -+ dput(hinopath.dentry); -+out_unlock: -+ if (suspend) -+ au_hn_inode_unlock(hdir); -+ else -+ inode_unlock(dir); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_dr_brid_init(struct au_dr_brid *brid, const struct path *path) -+{ -+ int err; -+ struct kstatfs kstfs; -+ dev_t dev; -+ struct dentry *dentry; -+ struct super_block *sb; -+ -+ err = vfs_statfs((void *)path, &kstfs); -+ AuTraceErr(err); -+ if (unlikely(err)) -+ goto out; -+ -+ /* todo: support for UUID */ -+ -+ if (kstfs.f_fsid.val[0] || kstfs.f_fsid.val[1]) { -+ brid->type = AuBrid_FSID; -+ brid->fsid = kstfs.f_fsid; -+ } else { -+ dentry = path->dentry; -+ sb = dentry->d_sb; -+ dev = sb->s_dev; -+ if (dev) { -+ brid->type = AuBrid_DEV; -+ brid->dev = dev; -+ } -+ } -+ -+out: -+ return err; -+} -+ -+int au_dr_br_init(struct super_block *sb, struct au_branch *br, -+ const struct path *path) -+{ -+ int err, i; -+ struct au_dr_br *dr; -+ struct hlist_bl_head *hbl; -+ -+ dr = &br->br_dirren; -+ hbl = dr->dr_h_ino; -+ for (i = 0; i < AuDirren_NHASH; i++, hbl++) -+ INIT_HLIST_BL_HEAD(hbl); -+ -+ err = au_dr_brid_init(&dr->dr_brid, path); -+ if (unlikely(err)) -+ goto out; -+ -+ if (au_opt_test(au_mntflags(sb), DIRREN)) -+ err = au_dr_hino(sb, /*bindex*/-1, br, path); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+int au_dr_br_fin(struct super_block *sb, struct au_branch *br) -+{ -+ int err; -+ -+ err = 0; -+ if (au_br_writable(br->br_perm)) -+ err = au_dr_hino(sb, /*bindex*/-1, br, /*path*/NULL); -+ if (!err) -+ au_dr_hino_free(&br->br_dirren); -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_brid_str(struct au_dr_brid *brid, struct inode *h_inode, -+ char *buf, size_t sz) -+{ -+ int err; -+ unsigned int major, minor; -+ char *p; -+ -+ p = buf; -+ err = snprintf(p, sz, "%d_", brid->type); -+ AuDebugOn(err > sz); -+ p += err; -+ sz -= err; -+ switch (brid->type) { -+ case AuBrid_Unset: -+ return -EINVAL; -+ case AuBrid_UUID: -+ err = snprintf(p, sz, "%pU", brid->uuid.b); -+ break; -+ case AuBrid_FSID: -+ err = snprintf(p, sz, "%08x-%08x", -+ brid->fsid.val[0], brid->fsid.val[1]); -+ break; -+ case AuBrid_DEV: -+ major = MAJOR(brid->dev); -+ minor = MINOR(brid->dev); -+ if (major <= 0xff && minor <= 0xff) -+ err = snprintf(p, sz, "%02x%02x", major, minor); -+ else -+ err = snprintf(p, sz, "%03x:%05x", major, minor); -+ break; -+ } -+ AuDebugOn(err > sz); -+ p += err; -+ sz -= err; -+ err = snprintf(p, sz, "_%llu", (unsigned long long)h_inode->i_ino); -+ AuDebugOn(err > sz); -+ p += err; -+ sz -= err; -+ -+ return p - buf; -+} -+ -+static int au_drinfo_name(struct au_branch *br, char *name, int len) -+{ -+ int rlen; -+ struct dentry *br_dentry; -+ struct inode *br_inode; -+ -+ br_dentry = au_br_dentry(br); -+ br_inode = d_inode(br_dentry); -+ rlen = au_brid_str(&br->br_dirren.dr_brid, br_inode, name, len); -+ AuDebugOn(rlen >= AUFS_DIRREN_ENV_VAL_SZ); -+ AuDebugOn(rlen > len); -+ -+ return rlen; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * from the given @h_dentry, construct drinfo at @*fdata. -+ * when the size of @*fdata is not enough, reallocate and return new @fdata and -+ * @allocated. -+ */ -+static int au_drinfo_construct(struct au_drinfo_fdata **fdata, -+ struct dentry *h_dentry, -+ unsigned char *allocated) -+{ -+ int err, v; -+ struct au_drinfo_fdata *f, *p; -+ struct au_drinfo *drinfo; -+ struct inode *h_inode; -+ struct qstr *qname; -+ -+ err = 0; -+ f = *fdata; -+ h_inode = d_inode(h_dentry); -+ qname = &h_dentry->d_name; -+ drinfo = &f->drinfo; -+ drinfo->ino = (__force uint64_t)cpu_to_be64(h_inode->i_ino); -+ drinfo->oldnamelen = qname->len; -+ if (*allocated < sizeof(*f) + qname->len) { -+ v = roundup_pow_of_two(*allocated + qname->len); -+ p = au_krealloc(f, v, GFP_NOFS, /*may_shrink*/0); -+ if (unlikely(!p)) { -+ err = -ENOMEM; -+ AuTraceErr(err); -+ goto out; -+ } -+ f = p; -+ *fdata = f; -+ *allocated = v; -+ drinfo = &f->drinfo; -+ } -+ memcpy(drinfo->oldname, qname->name, qname->len); -+ AuDbg("i%llu, %.*s\n", -+ be64_to_cpu((__force __be64)drinfo->ino), drinfo->oldnamelen, -+ drinfo->oldname); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* callers have to free the return value */ -+static struct au_drinfo *au_drinfo_read_k(struct file *file, ino_t h_ino) -+{ -+ struct au_drinfo *ret, *drinfo; -+ struct au_drinfo_fdata fdata; -+ int len; -+ loff_t pos; -+ ssize_t ssz; -+ -+ ret = ERR_PTR(-EIO); -+ pos = 0; -+ ssz = vfsub_read_k(file, &fdata, sizeof(fdata), &pos); -+ if (unlikely(ssz != sizeof(fdata))) { -+ AuIOErr("ssz %zd, %u, %pD2\n", -+ ssz, (unsigned int)sizeof(fdata), file); -+ goto out; -+ } -+ -+ fdata.magic = ntohl((__force __be32)fdata.magic); -+ switch (fdata.magic) { -+ case AUFS_DRINFO_MAGIC_V1: -+ break; -+ default: -+ AuIOErr("magic-num 0x%x, 0x%x, %pD2\n", -+ fdata.magic, AUFS_DRINFO_MAGIC_V1, file); -+ goto out; -+ } -+ -+ drinfo = &fdata.drinfo; -+ len = drinfo->oldnamelen; -+ if (!len) { -+ AuIOErr("broken drinfo %pD2\n", file); -+ goto out; -+ } -+ -+ ret = NULL; -+ drinfo->ino = be64_to_cpu((__force __be64)drinfo->ino); -+ if (unlikely(h_ino && drinfo->ino != h_ino)) { -+ AuDbg("ignored i%llu, i%llu, %pD2\n", -+ (unsigned long long)drinfo->ino, -+ (unsigned long long)h_ino, file); -+ goto out; /* success */ -+ } -+ -+ ret = kmalloc(sizeof(*ret) + len, GFP_NOFS); -+ if (unlikely(!ret)) { -+ ret = ERR_PTR(-ENOMEM); -+ AuTraceErrPtr(ret); -+ goto out; -+ } -+ -+ *ret = *drinfo; -+ ssz = vfsub_read_k(file, (void *)ret->oldname, len, &pos); -+ if (unlikely(ssz != len)) { -+ au_kfree_rcu(ret); -+ ret = ERR_PTR(-EIO); -+ AuIOErr("ssz %zd, %u, %pD2\n", ssz, len, file); -+ goto out; -+ } -+ -+ AuDbg("oldname %.*s\n", ret->oldnamelen, ret->oldname); -+ -+out: -+ return ret; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* in order to be revertible */ -+struct au_drinfo_rev_elm { -+ int created; -+ struct dentry *info_dentry; -+ struct au_drinfo *info_last; -+}; -+ -+struct au_drinfo_rev { -+ unsigned char already; -+ aufs_bindex_t nelm; -+ struct au_drinfo_rev_elm elm[0]; -+}; -+ -+/* todo: isn't it too large? */ -+struct au_drinfo_store { -+ struct path h_ppath; -+ struct dentry *h_dentry; -+ struct au_drinfo_fdata *fdata; -+ char *infoname; /* inside of whname, just after PFX */ -+ char whname[sizeof(AUFS_WH_DR_INFO_PFX) + AUFS_DIRREN_ENV_VAL_SZ]; -+ aufs_bindex_t btgt, btail; -+ unsigned char no_sio, -+ allocated, /* current size of *fdata */ -+ infonamelen, /* room size for p */ -+ whnamelen, /* length of the generated name */ -+ renameback; /* renamed back */ -+}; -+ -+/* on rename(2) error, the caller should revert it using @elm */ -+static int au_drinfo_do_store(struct au_drinfo_store *w, -+ struct au_drinfo_rev_elm *elm) -+{ -+ int err, len; -+ ssize_t ssz; -+ loff_t pos; -+ struct path infopath = { -+ .mnt = w->h_ppath.mnt -+ }; -+ struct inode *h_dir, *h_inode, *delegated; -+ struct file *infofile; -+ struct qstr *qname; -+ -+ AuDebugOn(elm -+ && memcmp(elm, page_address(ZERO_PAGE(0)), sizeof(*elm))); -+ -+ infopath.dentry = vfsub_lookup_one_len(w->whname, w->h_ppath.dentry, -+ w->whnamelen); -+ AuTraceErrPtr(infopath.dentry); -+ if (IS_ERR(infopath.dentry)) { -+ err = PTR_ERR(infopath.dentry); -+ goto out; -+ } -+ -+ err = 0; -+ h_dir = d_inode(w->h_ppath.dentry); -+ if (elm && d_is_negative(infopath.dentry)) { -+ err = vfsub_create(h_dir, &infopath, 0600, /*want_excl*/true); -+ AuTraceErr(err); -+ if (unlikely(err)) -+ goto out_dput; -+ elm->created = 1; -+ elm->info_dentry = dget(infopath.dentry); -+ } -+ -+ infofile = vfsub_dentry_open(&infopath, O_RDWR); -+ AuTraceErrPtr(infofile); -+ if (IS_ERR(infofile)) { -+ err = PTR_ERR(infofile); -+ goto out_dput; -+ } -+ -+ h_inode = d_inode(infopath.dentry); -+ if (elm && i_size_read(h_inode)) { -+ h_inode = d_inode(w->h_dentry); -+ elm->info_last = au_drinfo_read_k(infofile, h_inode->i_ino); -+ AuTraceErrPtr(elm->info_last); -+ if (IS_ERR(elm->info_last)) { -+ err = PTR_ERR(elm->info_last); -+ elm->info_last = NULL; -+ AuDebugOn(elm->info_dentry); -+ goto out_fput; -+ } -+ } -+ -+ if (elm && w->renameback) { -+ delegated = NULL; -+ err = vfsub_unlink(h_dir, &infopath, &delegated, /*force*/0); -+ AuTraceErr(err); -+ if (unlikely(err == -EWOULDBLOCK)) -+ iput(delegated); -+ goto out_fput; -+ } -+ -+ pos = 0; -+ qname = &w->h_dentry->d_name; -+ len = sizeof(*w->fdata) + qname->len; -+ if (!elm) -+ len = sizeof(*w->fdata) + w->fdata->drinfo.oldnamelen; -+ ssz = vfsub_write_k(infofile, w->fdata, len, &pos); -+ if (ssz == len) { -+ AuDbg("hi%llu, %.*s\n", w->fdata->drinfo.ino, -+ w->fdata->drinfo.oldnamelen, w->fdata->drinfo.oldname); -+ goto out_fput; /* success */ -+ } else { -+ err = -EIO; -+ if (ssz < 0) -+ err = ssz; -+ /* the caller should revert it using @elm */ -+ } -+ -+out_fput: -+ fput(infofile); -+out_dput: -+ dput(infopath.dentry); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+struct au_call_drinfo_do_store_args { -+ int *errp; -+ struct au_drinfo_store *w; -+ struct au_drinfo_rev_elm *elm; -+}; -+ -+static void au_call_drinfo_do_store(void *args) -+{ -+ struct au_call_drinfo_do_store_args *a = args; -+ -+ *a->errp = au_drinfo_do_store(a->w, a->elm); -+} -+ -+static int au_drinfo_store_sio(struct au_drinfo_store *w, -+ struct au_drinfo_rev_elm *elm) -+{ -+ int err, wkq_err; -+ -+ if (w->no_sio) -+ err = au_drinfo_do_store(w, elm); -+ else { -+ struct au_call_drinfo_do_store_args a = { -+ .errp = &err, -+ .w = w, -+ .elm = elm -+ }; -+ wkq_err = au_wkq_wait(au_call_drinfo_do_store, &a); -+ if (unlikely(wkq_err)) -+ err = wkq_err; -+ } -+ AuTraceErr(err); -+ -+ return err; -+} -+ -+static int au_drinfo_store_work_init(struct au_drinfo_store *w, -+ aufs_bindex_t btgt) -+{ -+ int err; -+ -+ memset(w, 0, sizeof(*w)); -+ w->allocated = roundup_pow_of_two(sizeof(*w->fdata) + 40); -+ strcpy(w->whname, AUFS_WH_DR_INFO_PFX); -+ w->infoname = w->whname + sizeof(AUFS_WH_DR_INFO_PFX) - 1; -+ w->infonamelen = sizeof(w->whname) - sizeof(AUFS_WH_DR_INFO_PFX); -+ w->btgt = btgt; -+ w->no_sio = !!uid_eq(current_fsuid(), GLOBAL_ROOT_UID); -+ -+ err = -ENOMEM; -+ w->fdata = kcalloc(1, w->allocated, GFP_NOFS); -+ if (unlikely(!w->fdata)) { -+ AuTraceErr(err); -+ goto out; -+ } -+ w->fdata->magic = (__force uint32_t)htonl(AUFS_DRINFO_MAGIC_V1); -+ err = 0; -+ -+out: -+ return err; -+} -+ -+static void au_drinfo_store_work_fin(struct au_drinfo_store *w) -+{ -+ au_kfree_rcu(w->fdata); -+} -+ -+static void au_drinfo_store_rev(struct au_drinfo_rev *rev, -+ struct au_drinfo_store *w) -+{ -+ struct au_drinfo_rev_elm *elm; -+ struct inode *h_dir, *delegated; -+ int err, nelm; -+ struct path infopath = { -+ .mnt = w->h_ppath.mnt -+ }; -+ -+ h_dir = d_inode(w->h_ppath.dentry); -+ IMustLock(h_dir); -+ -+ err = 0; -+ elm = rev->elm; -+ for (nelm = rev->nelm; nelm > 0; nelm--, elm++) { -+ AuDebugOn(elm->created && elm->info_last); -+ if (elm->created) { -+ AuDbg("here\n"); -+ delegated = NULL; -+ infopath.dentry = elm->info_dentry; -+ err = vfsub_unlink(h_dir, &infopath, &delegated, -+ !w->no_sio); -+ AuTraceErr(err); -+ if (unlikely(err == -EWOULDBLOCK)) -+ iput(delegated); -+ dput(elm->info_dentry); -+ } else if (elm->info_last) { -+ AuDbg("here\n"); -+ w->fdata->drinfo = *elm->info_last; -+ memcpy(w->fdata->drinfo.oldname, -+ elm->info_last->oldname, -+ elm->info_last->oldnamelen); -+ err = au_drinfo_store_sio(w, /*elm*/NULL); -+ au_kfree_rcu(elm->info_last); -+ } -+ if (unlikely(err)) -+ AuIOErr("%d, %s\n", err, w->whname); -+ /* go on even if err */ -+ } -+} -+ -+/* caller has to call au_dr_rename_fin() later */ -+static int au_drinfo_store(struct dentry *dentry, aufs_bindex_t btgt, -+ struct qstr *dst_name, void *_rev) -+{ -+ int err, sz, nelm; -+ aufs_bindex_t bindex, btail; -+ struct au_drinfo_store work; -+ struct au_drinfo_rev *rev, **p; -+ struct au_drinfo_rev_elm *elm; -+ struct super_block *sb; -+ struct au_branch *br; -+ struct au_hinode *hdir; -+ -+ err = au_drinfo_store_work_init(&work, btgt); -+ AuTraceErr(err); -+ if (unlikely(err)) -+ goto out; -+ -+ err = -ENOMEM; -+ btail = au_dbtaildir(dentry); -+ nelm = btail - btgt; -+ sz = sizeof(*rev) + sizeof(*elm) * nelm; -+ rev = kcalloc(1, sz, GFP_NOFS); -+ if (unlikely(!rev)) { -+ AuTraceErr(err); -+ goto out_args; -+ } -+ rev->nelm = nelm; -+ elm = rev->elm; -+ p = _rev; -+ *p = rev; -+ -+ err = 0; -+ sb = dentry->d_sb; -+ work.h_ppath.dentry = au_h_dptr(dentry, btgt); -+ work.h_ppath.mnt = au_sbr_mnt(sb, btgt); -+ hdir = au_hi(d_inode(dentry), btgt); -+ au_hn_inode_lock_nested(hdir, AuLsc_I_CHILD); -+ for (bindex = btgt + 1; bindex <= btail; bindex++, elm++) { -+ work.h_dentry = au_h_dptr(dentry, bindex); -+ if (!work.h_dentry) -+ continue; -+ -+ err = au_drinfo_construct(&work.fdata, work.h_dentry, -+ &work.allocated); -+ AuTraceErr(err); -+ if (unlikely(err)) -+ break; -+ -+ work.renameback = au_qstreq(&work.h_dentry->d_name, dst_name); -+ br = au_sbr(sb, bindex); -+ work.whnamelen = sizeof(AUFS_WH_DR_INFO_PFX) - 1; -+ work.whnamelen += au_drinfo_name(br, work.infoname, -+ work.infonamelen); -+ AuDbg("whname %.*s, i%llu, %.*s\n", -+ work.whnamelen, work.whname, -+ be64_to_cpu((__force __be64)work.fdata->drinfo.ino), -+ work.fdata->drinfo.oldnamelen, -+ work.fdata->drinfo.oldname); -+ -+ err = au_drinfo_store_sio(&work, elm); -+ AuTraceErr(err); -+ if (unlikely(err)) -+ break; -+ } -+ if (unlikely(err)) { -+ /* revert all drinfo */ -+ au_drinfo_store_rev(rev, &work); -+ au_kfree_try_rcu(rev); -+ *p = NULL; -+ } -+ au_hn_inode_unlock(hdir); -+ -+out_args: -+ au_drinfo_store_work_fin(&work); -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int au_dr_rename(struct dentry *src, aufs_bindex_t bindex, -+ struct qstr *dst_name, void *_rev) -+{ -+ int err, already; -+ ino_t ino; -+ struct super_block *sb; -+ struct au_branch *br; -+ struct au_dr_br *dr; -+ struct dentry *h_dentry; -+ struct inode *h_inode; -+ struct au_dr_hino *ent; -+ struct au_drinfo_rev *rev, **p; -+ -+ AuDbg("bindex %d\n", bindex); -+ -+ err = -ENOMEM; -+ ent = kmalloc(sizeof(*ent), GFP_NOFS); -+ if (unlikely(!ent)) -+ goto out; -+ -+ sb = src->d_sb; -+ br = au_sbr(sb, bindex); -+ dr = &br->br_dirren; -+ h_dentry = au_h_dptr(src, bindex); -+ h_inode = d_inode(h_dentry); -+ ino = h_inode->i_ino; -+ ent->dr_h_ino = ino; -+ already = au_dr_hino_test_add(dr, ino, ent); -+ AuDbg("b%d, hi%llu, already %d\n", -+ bindex, (unsigned long long)ino, already); -+ -+ err = au_drinfo_store(src, bindex, dst_name, _rev); -+ AuTraceErr(err); -+ if (!err) { -+ p = _rev; -+ rev = *p; -+ rev->already = already; -+ goto out; /* success */ -+ } -+ -+ /* revert */ -+ if (!already) -+ au_dr_hino_del(dr, ent); -+ au_kfree_rcu(ent); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+void au_dr_rename_fin(struct dentry *src, aufs_bindex_t btgt, void *_rev) -+{ -+ struct au_drinfo_rev *rev; -+ struct au_drinfo_rev_elm *elm; -+ int nelm; -+ -+ rev = _rev; -+ elm = rev->elm; -+ for (nelm = rev->nelm; nelm > 0; nelm--, elm++) { -+ dput(elm->info_dentry); -+ au_kfree_rcu(elm->info_last); -+ } -+ au_kfree_try_rcu(rev); -+} -+ -+void au_dr_rename_rev(struct dentry *src, aufs_bindex_t btgt, void *_rev) -+{ -+ int err; -+ struct au_drinfo_store work; -+ struct au_drinfo_rev *rev = _rev; -+ struct super_block *sb; -+ struct au_branch *br; -+ struct inode *h_inode; -+ struct au_dr_br *dr; -+ struct au_dr_hino *ent; -+ -+ err = au_drinfo_store_work_init(&work, btgt); -+ if (unlikely(err)) -+ goto out; -+ -+ sb = src->d_sb; -+ br = au_sbr(sb, btgt); -+ work.h_ppath.dentry = au_h_dptr(src, btgt); -+ work.h_ppath.mnt = au_br_mnt(br); -+ au_drinfo_store_rev(rev, &work); -+ au_drinfo_store_work_fin(&work); -+ if (rev->already) -+ goto out; -+ -+ dr = &br->br_dirren; -+ h_inode = d_inode(work.h_ppath.dentry); -+ ent = au_dr_hino_find(dr, h_inode->i_ino); -+ BUG_ON(!ent); -+ au_dr_hino_del(dr, ent); -+ au_kfree_rcu(ent); -+ -+out: -+ au_kfree_try_rcu(rev); -+ if (unlikely(err)) -+ pr_err("failed to remove dirren info\n"); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static struct au_drinfo *au_drinfo_do_load(struct path *h_ppath, -+ char *whname, int whnamelen, -+ struct dentry **info_dentry) -+{ -+ struct au_drinfo *drinfo; -+ struct file *f; -+ struct inode *h_dir; -+ struct path infopath; -+ int unlocked; -+ -+ AuDbg("%pd/%.*s\n", h_ppath->dentry, whnamelen, whname); -+ -+ *info_dentry = NULL; -+ drinfo = NULL; -+ unlocked = 0; -+ h_dir = d_inode(h_ppath->dentry); -+ inode_lock_shared_nested(h_dir, AuLsc_I_PARENT); -+ infopath.dentry = vfsub_lookup_one_len(whname, h_ppath->dentry, -+ whnamelen); -+ if (IS_ERR(infopath.dentry)) { -+ drinfo = (void *)infopath.dentry; -+ goto out; -+ } -+ -+ if (d_is_negative(infopath.dentry)) -+ goto out_dput; /* success */ -+ -+ infopath.mnt = h_ppath->mnt; -+ f = vfsub_dentry_open(&infopath, O_RDONLY); -+ inode_unlock_shared(h_dir); -+ unlocked = 1; -+ if (IS_ERR(f)) { -+ drinfo = (void *)f; -+ goto out_dput; -+ } -+ -+ drinfo = au_drinfo_read_k(f, /*h_ino*/0); -+ if (IS_ERR_OR_NULL(drinfo)) -+ goto out_fput; -+ -+ AuDbg("oldname %.*s\n", drinfo->oldnamelen, drinfo->oldname); -+ *info_dentry = dget(infopath.dentry); /* keep it alive */ -+ -+out_fput: -+ fput(f); -+out_dput: -+ dput(infopath.dentry); -+out: -+ if (!unlocked) -+ inode_unlock_shared(h_dir); -+ AuTraceErrPtr(drinfo); -+ return drinfo; -+} -+ -+struct au_drinfo_do_load_args { -+ struct au_drinfo **drinfop; -+ struct path *h_ppath; -+ char *whname; -+ int whnamelen; -+ struct dentry **info_dentry; -+}; -+ -+static void au_call_drinfo_do_load(void *args) -+{ -+ struct au_drinfo_do_load_args *a = args; -+ -+ *a->drinfop = au_drinfo_do_load(a->h_ppath, a->whname, a->whnamelen, -+ a->info_dentry); -+} -+ -+struct au_drinfo_load { -+ struct path h_ppath; -+ struct qstr *qname; -+ unsigned char no_sio; -+ -+ aufs_bindex_t ninfo; -+ struct au_drinfo **drinfo; -+}; -+ -+static int au_drinfo_load(struct au_drinfo_load *w, aufs_bindex_t bindex, -+ struct au_branch *br) -+{ -+ int err, wkq_err, whnamelen, e; -+ char whname[sizeof(AUFS_WH_DR_INFO_PFX) + AUFS_DIRREN_ENV_VAL_SZ] -+ = AUFS_WH_DR_INFO_PFX; -+ struct au_drinfo *drinfo; -+ struct qstr oldname; -+ struct inode *h_dir, *delegated; -+ struct dentry *info_dentry; -+ struct path infopath; -+ -+ whnamelen = sizeof(AUFS_WH_DR_INFO_PFX) - 1; -+ whnamelen += au_drinfo_name(br, whname + whnamelen, -+ sizeof(whname) - whnamelen); -+ if (w->no_sio) -+ drinfo = au_drinfo_do_load(&w->h_ppath, whname, whnamelen, -+ &info_dentry); -+ else { -+ struct au_drinfo_do_load_args args = { -+ .drinfop = &drinfo, -+ .h_ppath = &w->h_ppath, -+ .whname = whname, -+ .whnamelen = whnamelen, -+ .info_dentry = &info_dentry -+ }; -+ wkq_err = au_wkq_wait(au_call_drinfo_do_load, &args); -+ if (unlikely(wkq_err)) -+ drinfo = ERR_PTR(wkq_err); -+ } -+ err = PTR_ERR(drinfo); -+ if (IS_ERR_OR_NULL(drinfo)) -+ goto out; -+ -+ err = 0; -+ oldname.len = drinfo->oldnamelen; -+ oldname.name = drinfo->oldname; -+ if (au_qstreq(w->qname, &oldname)) { -+ /* the name is renamed back */ -+ au_kfree_rcu(drinfo); -+ drinfo = NULL; -+ -+ infopath.dentry = info_dentry; -+ infopath.mnt = w->h_ppath.mnt; -+ h_dir = d_inode(w->h_ppath.dentry); -+ delegated = NULL; -+ inode_lock_nested(h_dir, AuLsc_I_PARENT); -+ e = vfsub_unlink(h_dir, &infopath, &delegated, !w->no_sio); -+ inode_unlock(h_dir); -+ if (unlikely(e)) -+ AuIOErr("ignored %d, %pd2\n", e, &infopath.dentry); -+ if (unlikely(e == -EWOULDBLOCK)) -+ iput(delegated); -+ } -+ au_kfree_rcu(w->drinfo[bindex]); -+ w->drinfo[bindex] = drinfo; -+ dput(info_dentry); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static void au_dr_lkup_free(struct au_drinfo **drinfo, int n) -+{ -+ struct au_drinfo **p = drinfo; -+ -+ while (n-- > 0) -+ au_kfree_rcu(*drinfo++); -+ au_kfree_try_rcu(p); -+} -+ -+int au_dr_lkup(struct au_do_lookup_args *lkup, struct dentry *dentry, -+ aufs_bindex_t btgt) -+{ -+ int err, ninfo; -+ struct au_drinfo_load w; -+ aufs_bindex_t bindex, bbot; -+ struct au_branch *br; -+ struct inode *h_dir; -+ struct au_dr_hino *ent; -+ struct super_block *sb; -+ -+ AuDbg("%.*s, name %.*s, whname %.*s, b%d\n", -+ AuLNPair(&dentry->d_name), AuLNPair(&lkup->dirren.dr_name), -+ AuLNPair(&lkup->whname), btgt); -+ -+ sb = dentry->d_sb; -+ bbot = au_sbbot(sb); -+ w.ninfo = bbot + 1; -+ if (!lkup->dirren.drinfo) { -+ lkup->dirren.drinfo = kcalloc(w.ninfo, -+ sizeof(*lkup->dirren.drinfo), -+ GFP_NOFS); -+ if (unlikely(!lkup->dirren.drinfo)) { -+ err = -ENOMEM; -+ goto out; -+ } -+ lkup->dirren.ninfo = w.ninfo; -+ } -+ w.drinfo = lkup->dirren.drinfo; -+ w.no_sio = !!uid_eq(current_fsuid(), GLOBAL_ROOT_UID); -+ w.h_ppath.dentry = au_h_dptr(dentry, btgt); -+ AuDebugOn(!w.h_ppath.dentry); -+ w.h_ppath.mnt = au_sbr_mnt(sb, btgt); -+ w.qname = &dentry->d_name; -+ -+ ninfo = 0; -+ for (bindex = btgt + 1; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ err = au_drinfo_load(&w, bindex, br); -+ if (unlikely(err)) -+ goto out_free; -+ if (w.drinfo[bindex]) -+ ninfo++; -+ } -+ if (!ninfo) { -+ br = au_sbr(sb, btgt); -+ h_dir = d_inode(w.h_ppath.dentry); -+ ent = au_dr_hino_find(&br->br_dirren, h_dir->i_ino); -+ AuDebugOn(!ent); -+ au_dr_hino_del(&br->br_dirren, ent); -+ au_kfree_rcu(ent); -+ } -+ goto out; /* success */ -+ -+out_free: -+ au_dr_lkup_free(lkup->dirren.drinfo, lkup->dirren.ninfo); -+ lkup->dirren.ninfo = 0; -+ lkup->dirren.drinfo = NULL; -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+void au_dr_lkup_fin(struct au_do_lookup_args *lkup) -+{ -+ au_dr_lkup_free(lkup->dirren.drinfo, lkup->dirren.ninfo); -+} -+ -+int au_dr_lkup_name(struct au_do_lookup_args *lkup, aufs_bindex_t btgt) -+{ -+ int err; -+ struct au_drinfo *drinfo; -+ -+ err = 0; -+ if (!lkup->dirren.drinfo) -+ goto out; -+ AuDebugOn(lkup->dirren.ninfo < btgt + 1); -+ drinfo = lkup->dirren.drinfo[btgt + 1]; -+ if (!drinfo) -+ goto out; -+ -+ au_kfree_try_rcu(lkup->whname.name); -+ lkup->whname.name = NULL; -+ lkup->dirren.dr_name.len = drinfo->oldnamelen; -+ lkup->dirren.dr_name.name = drinfo->oldname; -+ lkup->name = &lkup->dirren.dr_name; -+ err = au_wh_name_alloc(&lkup->whname, lkup->name); -+ if (!err) -+ AuDbg("name %.*s, whname %.*s, b%d\n", -+ AuLNPair(lkup->name), AuLNPair(&lkup->whname), -+ btgt); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+int au_dr_lkup_h_ino(struct au_do_lookup_args *lkup, aufs_bindex_t bindex, -+ ino_t h_ino) -+{ -+ int match; -+ struct au_drinfo *drinfo; -+ -+ match = 1; -+ if (!lkup->dirren.drinfo) -+ goto out; -+ AuDebugOn(lkup->dirren.ninfo < bindex + 1); -+ drinfo = lkup->dirren.drinfo[bindex + 1]; -+ if (!drinfo) -+ goto out; -+ -+ match = (drinfo->ino == h_ino); -+ AuDbg("match %d\n", match); -+ -+out: -+ return match; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int au_dr_opt_set(struct super_block *sb) -+{ -+ int err; -+ aufs_bindex_t bindex, bbot; -+ struct au_branch *br; -+ -+ err = 0; -+ bbot = au_sbbot(sb); -+ for (bindex = 0; !err && bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ err = au_dr_hino(sb, bindex, /*br*/NULL, &br->br_path); -+ } -+ -+ return err; -+} -+ -+int au_dr_opt_flush(struct super_block *sb) -+{ -+ int err; -+ aufs_bindex_t bindex, bbot; -+ struct au_branch *br; -+ -+ err = 0; -+ bbot = au_sbbot(sb); -+ for (bindex = 0; !err && bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ if (au_br_writable(br->br_perm)) -+ err = au_dr_hino(sb, bindex, /*br*/NULL, /*path*/NULL); -+ } -+ -+ return err; -+} -+ -+int au_dr_opt_clr(struct super_block *sb, int no_flush) -+{ -+ int err; -+ aufs_bindex_t bindex, bbot; -+ struct au_branch *br; -+ -+ err = 0; -+ if (!no_flush) { -+ err = au_dr_opt_flush(sb); -+ if (unlikely(err)) -+ goto out; -+ } -+ -+ bbot = au_sbbot(sb); -+ for (bindex = 0; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ au_dr_hino_free(&br->br_dirren); -+ } -+ -+out: -+ return err; -+} -diff --git a/fs/aufs/dirren.h b/fs/aufs/dirren.h -new file mode 100644 -index 000000000000..a986736462c3 ---- /dev/null -+++ b/fs/aufs/dirren.h -@@ -0,0 +1,140 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2017-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * renamed dir info -+ */ -+ -+#ifndef __AUFS_DIRREN_H__ -+#define __AUFS_DIRREN_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/dcache.h> -+#include <linux/statfs.h> -+#include <linux/uuid.h> -+#include "hbl.h" -+ -+#define AuDirren_NHASH 100 -+ -+#ifdef CONFIG_AUFS_DIRREN -+enum au_brid_type { -+ AuBrid_Unset, -+ AuBrid_UUID, -+ AuBrid_FSID, -+ AuBrid_DEV -+}; -+ -+struct au_dr_brid { -+ enum au_brid_type type; -+ union { -+ uuid_t uuid; /* unimplemented yet */ -+ fsid_t fsid; -+ dev_t dev; -+ }; -+}; -+ -+/* 20 is the max digits length of ulong 64 */ -+/* brid-type "_" uuid "_" inum */ -+#define AUFS_DIRREN_FNAME_SZ (1 + 1 + UUID_STRING_LEN + 20) -+#define AUFS_DIRREN_ENV_VAL_SZ (AUFS_DIRREN_FNAME_SZ + 1 + 20) -+ -+struct au_dr_hino { -+ struct hlist_bl_node dr_hnode; -+ ino_t dr_h_ino; -+}; -+ -+struct au_dr_br { -+ struct hlist_bl_head dr_h_ino[AuDirren_NHASH]; -+ struct au_dr_brid dr_brid; -+}; -+ -+struct au_dr_lookup { -+ /* dr_name is pointed by struct au_do_lookup_args.name */ -+ struct qstr dr_name; /* subset of dr_info */ -+ aufs_bindex_t ninfo; -+ struct au_drinfo **drinfo; -+}; -+#else -+struct au_dr_hino; -+/* empty */ -+struct au_dr_br { }; -+struct au_dr_lookup { }; -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct au_branch; -+struct au_do_lookup_args; -+struct au_hinode; -+#ifdef CONFIG_AUFS_DIRREN -+int au_dr_hino_test_add(struct au_dr_br *dr, ino_t h_ino, -+ struct au_dr_hino *add_ent); -+void au_dr_hino_free(struct au_dr_br *dr); -+int au_dr_br_init(struct super_block *sb, struct au_branch *br, -+ const struct path *path); -+int au_dr_br_fin(struct super_block *sb, struct au_branch *br); -+int au_dr_rename(struct dentry *src, aufs_bindex_t bindex, -+ struct qstr *dst_name, void *_rev); -+void au_dr_rename_fin(struct dentry *src, aufs_bindex_t btgt, void *rev); -+void au_dr_rename_rev(struct dentry *src, aufs_bindex_t bindex, void *rev); -+int au_dr_lkup(struct au_do_lookup_args *lkup, struct dentry *dentry, -+ aufs_bindex_t bindex); -+int au_dr_lkup_name(struct au_do_lookup_args *lkup, aufs_bindex_t btgt); -+int au_dr_lkup_h_ino(struct au_do_lookup_args *lkup, aufs_bindex_t bindex, -+ ino_t h_ino); -+void au_dr_lkup_fin(struct au_do_lookup_args *lkup); -+int au_dr_opt_set(struct super_block *sb); -+int au_dr_opt_flush(struct super_block *sb); -+int au_dr_opt_clr(struct super_block *sb, int no_flush); -+#else -+AuStubInt0(au_dr_hino_test_add, struct au_dr_br *dr, ino_t h_ino, -+ struct au_dr_hino *add_ent); -+AuStubVoid(au_dr_hino_free, struct au_dr_br *dr); -+AuStubInt0(au_dr_br_init, struct super_block *sb, struct au_branch *br, -+ const struct path *path); -+AuStubInt0(au_dr_br_fin, struct super_block *sb, struct au_branch *br); -+AuStubInt0(au_dr_rename, struct dentry *src, aufs_bindex_t bindex, -+ struct qstr *dst_name, void *_rev); -+AuStubVoid(au_dr_rename_fin, struct dentry *src, aufs_bindex_t btgt, void *rev); -+AuStubVoid(au_dr_rename_rev, struct dentry *src, aufs_bindex_t bindex, -+ void *rev); -+AuStubInt0(au_dr_lkup, struct au_do_lookup_args *lkup, struct dentry *dentry, -+ aufs_bindex_t bindex); -+AuStubInt0(au_dr_lkup_name, struct au_do_lookup_args *lkup, aufs_bindex_t btgt); -+AuStubInt0(au_dr_lkup_h_ino, struct au_do_lookup_args *lkup, -+ aufs_bindex_t bindex, ino_t h_ino); -+AuStubVoid(au_dr_lkup_fin, struct au_do_lookup_args *lkup); -+AuStubInt0(au_dr_opt_set, struct super_block *sb); -+AuStubInt0(au_dr_opt_flush, struct super_block *sb); -+AuStubInt0(au_dr_opt_clr, struct super_block *sb, int no_flush); -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+#ifdef CONFIG_AUFS_DIRREN -+static inline int au_dr_ihash(ino_t h_ino) -+{ -+ return h_ino % AuDirren_NHASH; -+} -+#else -+AuStubInt0(au_dr_ihash, ino_t h_ino); -+#endif -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_DIRREN_H__ */ -diff --git a/fs/aufs/dynop.c b/fs/aufs/dynop.c -new file mode 100644 -index 000000000000..ed79f8255a8f ---- /dev/null -+++ b/fs/aufs/dynop.c -@@ -0,0 +1,367 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2010-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * dynamically customizable operations for regular files -+ */ -+ -+#include "aufs.h" -+ -+#define DyPrSym(key) AuDbgSym(key->dk_op.dy_hop) -+ -+/* -+ * How large will these lists be? -+ * Usually just a few elements, 20-30 at most for each, I guess. -+ */ -+static struct hlist_bl_head dynop[AuDyLast]; -+ -+static struct au_dykey *dy_gfind_get(struct hlist_bl_head *hbl, -+ const void *h_op) -+{ -+ struct au_dykey *key, *tmp; -+ struct hlist_bl_node *pos; -+ -+ key = NULL; -+ hlist_bl_lock(hbl); -+ hlist_bl_for_each_entry(tmp, pos, hbl, dk_hnode) -+ if (tmp->dk_op.dy_hop == h_op) { -+ if (kref_get_unless_zero(&tmp->dk_kref)) -+ key = tmp; -+ break; -+ } -+ hlist_bl_unlock(hbl); -+ -+ return key; -+} -+ -+static struct au_dykey *dy_bradd(struct au_branch *br, struct au_dykey *key) -+{ -+ struct au_dykey **k, *found; -+ const void *h_op = key->dk_op.dy_hop; -+ int i; -+ -+ found = NULL; -+ k = br->br_dykey; -+ for (i = 0; i < AuBrDynOp; i++) -+ if (k[i]) { -+ if (k[i]->dk_op.dy_hop == h_op) { -+ found = k[i]; -+ break; -+ } -+ } else -+ break; -+ if (!found) { -+ spin_lock(&br->br_dykey_lock); -+ for (; i < AuBrDynOp; i++) -+ if (k[i]) { -+ if (k[i]->dk_op.dy_hop == h_op) { -+ found = k[i]; -+ break; -+ } -+ } else { -+ k[i] = key; -+ break; -+ } -+ spin_unlock(&br->br_dykey_lock); -+ BUG_ON(i == AuBrDynOp); /* expand the array */ -+ } -+ -+ return found; -+} -+ -+/* kref_get() if @key is already added */ -+static struct au_dykey *dy_gadd(struct hlist_bl_head *hbl, struct au_dykey *key) -+{ -+ struct au_dykey *tmp, *found; -+ struct hlist_bl_node *pos; -+ const void *h_op = key->dk_op.dy_hop; -+ -+ found = NULL; -+ hlist_bl_lock(hbl); -+ hlist_bl_for_each_entry(tmp, pos, hbl, dk_hnode) -+ if (tmp->dk_op.dy_hop == h_op) { -+ if (kref_get_unless_zero(&tmp->dk_kref)) -+ found = tmp; -+ break; -+ } -+ if (!found) -+ hlist_bl_add_head(&key->dk_hnode, hbl); -+ hlist_bl_unlock(hbl); -+ -+ if (!found) -+ DyPrSym(key); -+ return found; -+} -+ -+static void dy_free_rcu(struct rcu_head *rcu) -+{ -+ struct au_dykey *key; -+ -+ key = container_of(rcu, struct au_dykey, dk_rcu); -+ DyPrSym(key); -+ kfree(key); -+} -+ -+static void dy_free(struct kref *kref) -+{ -+ struct au_dykey *key; -+ struct hlist_bl_head *hbl; -+ -+ key = container_of(kref, struct au_dykey, dk_kref); -+ hbl = dynop + key->dk_op.dy_type; -+ au_hbl_del(&key->dk_hnode, hbl); -+ call_rcu(&key->dk_rcu, dy_free_rcu); -+} -+ -+void au_dy_put(struct au_dykey *key) -+{ -+ kref_put(&key->dk_kref, dy_free); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+#define DyDbgSize(cnt, op) AuDebugOn(cnt != sizeof(op)/sizeof(void *)) -+ -+#ifdef CONFIG_AUFS_DEBUG -+#define DyDbgDeclare(cnt) unsigned int cnt = 0 -+#define DyDbgInc(cnt) do { cnt++; } while (0) -+#else -+#define DyDbgDeclare(cnt) do {} while (0) -+#define DyDbgInc(cnt) do {} while (0) -+#endif -+ -+#define DySet(func, dst, src, h_op, h_sb) do { \ -+ DyDbgInc(cnt); \ -+ if (h_op->func) { \ -+ if (src.func) \ -+ dst.func = src.func; \ -+ else \ -+ AuDbg("%s %s\n", au_sbtype(h_sb), #func); \ -+ } \ -+} while (0) -+ -+#define DySetForce(func, dst, src) do { \ -+ AuDebugOn(!src.func); \ -+ DyDbgInc(cnt); \ -+ dst.func = src.func; \ -+} while (0) -+ -+#define DySetAop(func) \ -+ DySet(func, dyaop->da_op, aufs_aop, h_aop, h_sb) -+#define DySetAopForce(func) \ -+ DySetForce(func, dyaop->da_op, aufs_aop) -+ -+static void dy_aop(struct au_dykey *key, const void *h_op, -+ struct super_block *h_sb __maybe_unused) -+{ -+ struct au_dyaop *dyaop = (void *)key; -+ const struct address_space_operations *h_aop = h_op; -+ DyDbgDeclare(cnt); -+ -+ AuDbg("%s\n", au_sbtype(h_sb)); -+ -+ DySetAop(writepage); -+ DySetAopForce(readpage); /* force */ -+ DySetAop(writepages); -+ DySetAop(set_page_dirty); -+ DySetAop(readpages); -+ DySetAop(write_begin); -+ DySetAop(write_end); -+ DySetAop(bmap); -+ DySetAop(invalidatepage); -+ DySetAop(releasepage); -+ DySetAop(freepage); -+ /* this one will be changed according to an aufs mount option */ -+ DySetAop(direct_IO); -+ DySetAop(migratepage); -+ DySetAop(isolate_page); -+ DySetAop(putback_page); -+ DySetAop(launder_page); -+ DySetAop(is_partially_uptodate); -+ DySetAop(is_dirty_writeback); -+ DySetAop(error_remove_page); -+ DySetAop(swap_activate); -+ DySetAop(swap_deactivate); -+ -+ DyDbgSize(cnt, *h_aop); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static void dy_bug(struct kref *kref) -+{ -+ BUG(); -+} -+ -+static struct au_dykey *dy_get(struct au_dynop *op, struct au_branch *br) -+{ -+ struct au_dykey *key, *old; -+ struct hlist_bl_head *hbl; -+ struct op { -+ unsigned int sz; -+ void (*set)(struct au_dykey *key, const void *h_op, -+ struct super_block *h_sb __maybe_unused); -+ }; -+ static const struct op a[] = { -+ [AuDy_AOP] = { -+ .sz = sizeof(struct au_dyaop), -+ .set = dy_aop -+ } -+ }; -+ const struct op *p; -+ -+ hbl = dynop + op->dy_type; -+ key = dy_gfind_get(hbl, op->dy_hop); -+ if (key) -+ goto out_add; /* success */ -+ -+ p = a + op->dy_type; -+ key = kzalloc(p->sz, GFP_NOFS); -+ if (unlikely(!key)) { -+ key = ERR_PTR(-ENOMEM); -+ goto out; -+ } -+ -+ key->dk_op.dy_hop = op->dy_hop; -+ kref_init(&key->dk_kref); -+ p->set(key, op->dy_hop, au_br_sb(br)); -+ old = dy_gadd(hbl, key); -+ if (old) { -+ au_kfree_rcu(key); -+ key = old; -+ } -+ -+out_add: -+ old = dy_bradd(br, key); -+ if (old) -+ /* its ref-count should never be zero here */ -+ kref_put(&key->dk_kref, dy_bug); -+out: -+ return key; -+} -+ -+/* ---------------------------------------------------------------------- */ -+/* -+ * Aufs prohibits O_DIRECT by default even if the branch supports it. -+ * This behaviour is necessary to return an error from open(O_DIRECT) instead -+ * of the succeeding I/O. The dio mount option enables O_DIRECT and makes -+ * open(O_DIRECT) always succeed, but the succeeding I/O may return an error. -+ * See the aufs manual in detail. -+ */ -+static void dy_adx(struct au_dyaop *dyaop, int do_dx) -+{ -+ if (!do_dx) -+ dyaop->da_op.direct_IO = NULL; -+ else -+ dyaop->da_op.direct_IO = aufs_aop.direct_IO; -+} -+ -+static struct au_dyaop *dy_aget(struct au_branch *br, -+ const struct address_space_operations *h_aop, -+ int do_dx) -+{ -+ struct au_dyaop *dyaop; -+ struct au_dynop op; -+ -+ op.dy_type = AuDy_AOP; -+ op.dy_haop = h_aop; -+ dyaop = (void *)dy_get(&op, br); -+ if (IS_ERR(dyaop)) -+ goto out; -+ dy_adx(dyaop, do_dx); -+ -+out: -+ return dyaop; -+} -+ -+int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex, -+ struct inode *h_inode) -+{ -+ int err, do_dx; -+ struct super_block *sb; -+ struct au_branch *br; -+ struct au_dyaop *dyaop; -+ -+ AuDebugOn(!S_ISREG(h_inode->i_mode)); -+ IiMustWriteLock(inode); -+ -+ sb = inode->i_sb; -+ br = au_sbr(sb, bindex); -+ do_dx = !!au_opt_test(au_mntflags(sb), DIO); -+ dyaop = dy_aget(br, h_inode->i_mapping->a_ops, do_dx); -+ err = PTR_ERR(dyaop); -+ if (IS_ERR(dyaop)) -+ /* unnecessary to call dy_fput() */ -+ goto out; -+ -+ err = 0; -+ inode->i_mapping->a_ops = &dyaop->da_op; -+ -+out: -+ return err; -+} -+ -+/* -+ * Is it safe to replace a_ops during the inode/file is in operation? -+ * Yes, I hope so. -+ */ -+int au_dy_irefresh(struct inode *inode) -+{ -+ int err; -+ aufs_bindex_t btop; -+ struct inode *h_inode; -+ -+ err = 0; -+ if (S_ISREG(inode->i_mode)) { -+ btop = au_ibtop(inode); -+ h_inode = au_h_iptr(inode, btop); -+ err = au_dy_iaop(inode, btop, h_inode); -+ } -+ return err; -+} -+ -+void au_dy_arefresh(int do_dx) -+{ -+ struct hlist_bl_head *hbl; -+ struct hlist_bl_node *pos; -+ struct au_dykey *key; -+ -+ hbl = dynop + AuDy_AOP; -+ hlist_bl_lock(hbl); -+ hlist_bl_for_each_entry(key, pos, hbl, dk_hnode) -+ dy_adx((void *)key, do_dx); -+ hlist_bl_unlock(hbl); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+void __init au_dy_init(void) -+{ -+ int i; -+ -+ for (i = 0; i < AuDyLast; i++) -+ INIT_HLIST_BL_HEAD(dynop + i); -+} -+ -+void au_dy_fin(void) -+{ -+ int i; -+ -+ for (i = 0; i < AuDyLast; i++) -+ WARN_ON(!hlist_bl_empty(dynop + i)); -+} -diff --git a/fs/aufs/dynop.h b/fs/aufs/dynop.h -new file mode 100644 -index 000000000000..5d0b36559425 ---- /dev/null -+++ b/fs/aufs/dynop.h -@@ -0,0 +1,77 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2010-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * dynamically customizable operations (for regular files only) -+ */ -+ -+#ifndef __AUFS_DYNOP_H__ -+#define __AUFS_DYNOP_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/fs.h> -+#include <linux/kref.h> -+ -+enum {AuDy_AOP, AuDyLast}; -+ -+struct au_dynop { -+ int dy_type; -+ union { -+ const void *dy_hop; -+ const struct address_space_operations *dy_haop; -+ }; -+}; -+ -+struct au_dykey { -+ union { -+ struct hlist_bl_node dk_hnode; -+ struct rcu_head dk_rcu; -+ }; -+ struct au_dynop dk_op; -+ -+ /* -+ * during I am in the branch local array, kref is gotten. when the -+ * branch is removed, kref is put. -+ */ -+ struct kref dk_kref; -+}; -+ -+/* stop unioning since their sizes are very different from each other */ -+struct au_dyaop { -+ struct au_dykey da_key; -+ struct address_space_operations da_op; /* not const */ -+}; -+/* make sure that 'struct au_dykey *' can be any type */ -+static_assert(!offsetof(struct au_dyaop, da_key)); -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* dynop.c */ -+struct au_branch; -+void au_dy_put(struct au_dykey *key); -+int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex, -+ struct inode *h_inode); -+int au_dy_irefresh(struct inode *inode); -+void au_dy_arefresh(int do_dio); -+ -+void __init au_dy_init(void); -+void au_dy_fin(void); -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_DYNOP_H__ */ -diff --git a/fs/aufs/export.c b/fs/aufs/export.c -new file mode 100644 -index 000000000000..1da2ca0a969b ---- /dev/null -+++ b/fs/aufs/export.c -@@ -0,0 +1,838 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * export via nfs -+ */ -+ -+#include <linux/exportfs.h> -+#include <linux/fs_struct.h> -+#include <linux/namei.h> -+#include <linux/nsproxy.h> -+#include <linux/random.h> -+#include <linux/writeback.h> -+#include "aufs.h" -+ -+union conv { -+#ifdef CONFIG_AUFS_INO_T_64 -+ __u32 a[2]; -+#else -+ __u32 a[1]; -+#endif -+ ino_t ino; -+}; -+ -+static ino_t decode_ino(__u32 *a) -+{ -+ union conv u; -+ -+ BUILD_BUG_ON(sizeof(u.ino) != sizeof(u.a)); -+ u.a[0] = a[0]; -+#ifdef CONFIG_AUFS_INO_T_64 -+ u.a[1] = a[1]; -+#endif -+ return u.ino; -+} -+ -+static void encode_ino(__u32 *a, ino_t ino) -+{ -+ union conv u; -+ -+ u.ino = ino; -+ a[0] = u.a[0]; -+#ifdef CONFIG_AUFS_INO_T_64 -+ a[1] = u.a[1]; -+#endif -+} -+ -+/* NFS file handle */ -+enum { -+ Fh_br_id, -+ Fh_sigen, -+#ifdef CONFIG_AUFS_INO_T_64 -+ /* support 64bit inode number */ -+ Fh_ino1, -+ Fh_ino2, -+ Fh_dir_ino1, -+ Fh_dir_ino2, -+#else -+ Fh_ino1, -+ Fh_dir_ino1, -+#endif -+ Fh_igen, -+ Fh_h_type, -+ Fh_tail, -+ -+ Fh_ino = Fh_ino1, -+ Fh_dir_ino = Fh_dir_ino1 -+}; -+ -+static int au_test_anon(struct dentry *dentry) -+{ -+ /* note: read d_flags without d_lock */ -+ return !!(dentry->d_flags & DCACHE_DISCONNECTED); -+} -+ -+int au_test_nfsd(void) -+{ -+ int ret; -+ struct task_struct *tsk = current; -+ char comm[sizeof(tsk->comm)]; -+ -+ ret = 0; -+ if (tsk->flags & PF_KTHREAD) { -+ get_task_comm(comm, tsk); -+ ret = !strcmp(comm, "nfsd"); -+ } -+ -+ return ret; -+} -+ -+/* ---------------------------------------------------------------------- */ -+/* inode generation external table */ -+ -+void au_xigen_inc(struct inode *inode) -+{ -+ loff_t pos; -+ ssize_t sz; -+ __u32 igen; -+ struct super_block *sb; -+ struct au_sbinfo *sbinfo; -+ -+ sb = inode->i_sb; -+ AuDebugOn(!au_opt_test(au_mntflags(sb), XINO)); -+ -+ sbinfo = au_sbi(sb); -+ pos = inode->i_ino; -+ pos *= sizeof(igen); -+ igen = inode->i_generation + 1; -+ sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xigen, &igen, -+ sizeof(igen), &pos); -+ if (sz == sizeof(igen)) -+ return; /* success */ -+ -+ if (unlikely(sz >= 0)) -+ AuIOErr("xigen error (%zd)\n", sz); -+} -+ -+int au_xigen_new(struct inode *inode) -+{ -+ int err; -+ loff_t pos; -+ ssize_t sz; -+ struct super_block *sb; -+ struct au_sbinfo *sbinfo; -+ struct file *file; -+ -+ err = 0; -+ /* todo: dirty, at mount time */ -+ if (inode->i_ino == AUFS_ROOT_INO) -+ goto out; -+ sb = inode->i_sb; -+ SiMustAnyLock(sb); -+ if (unlikely(!au_opt_test(au_mntflags(sb), XINO))) -+ goto out; -+ -+ err = -EFBIG; -+ pos = inode->i_ino; -+ if (unlikely(au_loff_max / sizeof(inode->i_generation) - 1 < pos)) { -+ AuIOErr1("too large i%lld\n", pos); -+ goto out; -+ } -+ pos *= sizeof(inode->i_generation); -+ -+ err = 0; -+ sbinfo = au_sbi(sb); -+ file = sbinfo->si_xigen; -+ BUG_ON(!file); -+ -+ if (vfsub_f_size_read(file) -+ < pos + sizeof(inode->i_generation)) { -+ inode->i_generation = atomic_inc_return(&sbinfo->si_xigen_next); -+ sz = xino_fwrite(sbinfo->si_xwrite, file, &inode->i_generation, -+ sizeof(inode->i_generation), &pos); -+ } else -+ sz = xino_fread(sbinfo->si_xread, file, &inode->i_generation, -+ sizeof(inode->i_generation), &pos); -+ if (sz == sizeof(inode->i_generation)) -+ goto out; /* success */ -+ -+ err = sz; -+ if (unlikely(sz >= 0)) { -+ err = -EIO; -+ AuIOErr("xigen error (%zd)\n", sz); -+ } -+ -+out: -+ return err; -+} -+ -+int au_xigen_set(struct super_block *sb, struct path *path) -+{ -+ int err; -+ struct au_sbinfo *sbinfo; -+ struct file *file; -+ -+ SiMustWriteLock(sb); -+ -+ sbinfo = au_sbi(sb); -+ file = au_xino_create2(sb, path, sbinfo->si_xigen); -+ err = PTR_ERR(file); -+ if (IS_ERR(file)) -+ goto out; -+ err = 0; -+ if (sbinfo->si_xigen) -+ fput(sbinfo->si_xigen); -+ sbinfo->si_xigen = file; -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+void au_xigen_clr(struct super_block *sb) -+{ -+ struct au_sbinfo *sbinfo; -+ -+ SiMustWriteLock(sb); -+ -+ sbinfo = au_sbi(sb); -+ if (sbinfo->si_xigen) { -+ fput(sbinfo->si_xigen); -+ sbinfo->si_xigen = NULL; -+ } -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static struct dentry *decode_by_ino(struct super_block *sb, ino_t ino, -+ ino_t dir_ino) -+{ -+ struct dentry *dentry, *d; -+ struct inode *inode; -+ unsigned int sigen; -+ -+ dentry = NULL; -+ inode = ilookup(sb, ino); -+ if (!inode) -+ goto out; -+ -+ dentry = ERR_PTR(-ESTALE); -+ sigen = au_sigen(sb); -+ if (unlikely(au_is_bad_inode(inode) -+ || IS_DEADDIR(inode) -+ || sigen != au_iigen(inode, NULL))) -+ goto out_iput; -+ -+ dentry = NULL; -+ if (!dir_ino || S_ISDIR(inode->i_mode)) -+ dentry = d_find_alias(inode); -+ else { -+ spin_lock(&inode->i_lock); -+ hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias) { -+ spin_lock(&d->d_lock); -+ if (!au_test_anon(d) -+ && d_inode(d->d_parent)->i_ino == dir_ino) { -+ dentry = dget_dlock(d); -+ spin_unlock(&d->d_lock); -+ break; -+ } -+ spin_unlock(&d->d_lock); -+ } -+ spin_unlock(&inode->i_lock); -+ } -+ if (unlikely(dentry && au_digen_test(dentry, sigen))) { -+ /* need to refresh */ -+ dput(dentry); -+ dentry = NULL; -+ } -+ -+out_iput: -+ iput(inode); -+out: -+ AuTraceErrPtr(dentry); -+ return dentry; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* todo: dirty? */ -+/* if exportfs_decode_fh() passed vfsmount*, we could be happy */ -+ -+struct au_compare_mnt_args { -+ /* input */ -+ struct super_block *sb; -+ -+ /* output */ -+ struct vfsmount *mnt; -+}; -+ -+static int au_compare_mnt(struct vfsmount *mnt, void *arg) -+{ -+ struct au_compare_mnt_args *a = arg; -+ -+ if (mnt->mnt_sb != a->sb) -+ return 0; -+ a->mnt = mntget(mnt); -+ return 1; -+} -+ -+static struct vfsmount *au_mnt_get(struct super_block *sb) -+{ -+ int err; -+ struct path root; -+ struct au_compare_mnt_args args = { -+ .sb = sb -+ }; -+ -+ get_fs_root(current->fs, &root); -+ rcu_read_lock(); -+ err = iterate_mounts(au_compare_mnt, &args, root.mnt); -+ rcu_read_unlock(); -+ path_put(&root); -+ AuDebugOn(!err); -+ AuDebugOn(!args.mnt); -+ return args.mnt; -+} -+ -+struct au_nfsd_si_lock { -+ unsigned int sigen; -+ aufs_bindex_t bindex, br_id; -+ unsigned char force_lock; -+}; -+ -+static int si_nfsd_read_lock(struct super_block *sb, -+ struct au_nfsd_si_lock *nsi_lock) -+{ -+ int err; -+ aufs_bindex_t bindex; -+ -+ si_read_lock(sb, AuLock_FLUSH); -+ -+ /* branch id may be wrapped around */ -+ err = 0; -+ bindex = au_br_index(sb, nsi_lock->br_id); -+ if (bindex >= 0 && nsi_lock->sigen + AUFS_BRANCH_MAX > au_sigen(sb)) -+ goto out; /* success */ -+ -+ err = -ESTALE; -+ bindex = -1; -+ if (!nsi_lock->force_lock) -+ si_read_unlock(sb); -+ -+out: -+ nsi_lock->bindex = bindex; -+ return err; -+} -+ -+struct find_name_by_ino { -+ struct dir_context ctx; -+ int called, found; -+ ino_t ino; -+ char *name; -+ int namelen; -+}; -+ -+static int -+find_name_by_ino(struct dir_context *ctx, const char *name, int namelen, -+ loff_t offset, u64 ino, unsigned int d_type) -+{ -+ struct find_name_by_ino *a = container_of(ctx, struct find_name_by_ino, -+ ctx); -+ -+ a->called++; -+ if (a->ino != ino) -+ return 0; -+ -+ memcpy(a->name, name, namelen); -+ a->namelen = namelen; -+ a->found = 1; -+ return 1; -+} -+ -+static struct dentry *au_lkup_by_ino(struct path *path, ino_t ino, -+ struct au_nfsd_si_lock *nsi_lock) -+{ -+ struct dentry *dentry, *parent; -+ struct file *file; -+ struct inode *dir; -+ struct find_name_by_ino arg = { -+ .ctx = { -+ .actor = find_name_by_ino -+ } -+ }; -+ int err; -+ -+ parent = path->dentry; -+ if (nsi_lock) -+ si_read_unlock(parent->d_sb); -+ file = vfsub_dentry_open(path, au_dir_roflags); -+ dentry = (void *)file; -+ if (IS_ERR(file)) -+ goto out; -+ -+ dentry = ERR_PTR(-ENOMEM); -+ arg.name = (void *)__get_free_page(GFP_NOFS); -+ if (unlikely(!arg.name)) -+ goto out_file; -+ arg.ino = ino; -+ arg.found = 0; -+ do { -+ arg.called = 0; -+ /* smp_mb(); */ -+ err = vfsub_iterate_dir(file, &arg.ctx); -+ } while (!err && !arg.found && arg.called); -+ dentry = ERR_PTR(err); -+ if (unlikely(err)) -+ goto out_name; -+ /* instead of ENOENT */ -+ dentry = ERR_PTR(-ESTALE); -+ if (!arg.found) -+ goto out_name; -+ -+ /* do not call vfsub_lkup_one() */ -+ dir = d_inode(parent); -+ dentry = vfsub_lookup_one_len_unlocked(arg.name, parent, arg.namelen); -+ AuTraceErrPtr(dentry); -+ if (IS_ERR(dentry)) -+ goto out_name; -+ AuDebugOn(au_test_anon(dentry)); -+ if (unlikely(d_really_is_negative(dentry))) { -+ dput(dentry); -+ dentry = ERR_PTR(-ENOENT); -+ } -+ -+out_name: -+ free_page((unsigned long)arg.name); -+out_file: -+ fput(file); -+out: -+ if (unlikely(nsi_lock -+ && si_nfsd_read_lock(parent->d_sb, nsi_lock) < 0)) -+ if (!IS_ERR(dentry)) { -+ dput(dentry); -+ dentry = ERR_PTR(-ESTALE); -+ } -+ AuTraceErrPtr(dentry); -+ return dentry; -+} -+ -+static struct dentry *decode_by_dir_ino(struct super_block *sb, ino_t ino, -+ ino_t dir_ino, -+ struct au_nfsd_si_lock *nsi_lock) -+{ -+ struct dentry *dentry; -+ struct path path; -+ -+ if (dir_ino != AUFS_ROOT_INO) { -+ path.dentry = decode_by_ino(sb, dir_ino, 0); -+ dentry = path.dentry; -+ if (!path.dentry || IS_ERR(path.dentry)) -+ goto out; -+ AuDebugOn(au_test_anon(path.dentry)); -+ } else -+ path.dentry = dget(sb->s_root); -+ -+ path.mnt = au_mnt_get(sb); -+ dentry = au_lkup_by_ino(&path, ino, nsi_lock); -+ path_put(&path); -+ -+out: -+ AuTraceErrPtr(dentry); -+ return dentry; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int h_acceptable(void *expv, struct dentry *dentry) -+{ -+ return 1; -+} -+ -+static char *au_build_path(struct dentry *h_parent, struct path *h_rootpath, -+ char *buf, int len, struct super_block *sb) -+{ -+ char *p; -+ int n; -+ struct path path; -+ -+ p = d_path(h_rootpath, buf, len); -+ if (IS_ERR(p)) -+ goto out; -+ n = strlen(p); -+ -+ path.mnt = h_rootpath->mnt; -+ path.dentry = h_parent; -+ p = d_path(&path, buf, len); -+ if (IS_ERR(p)) -+ goto out; -+ if (n != 1) -+ p += n; -+ -+ path.mnt = au_mnt_get(sb); -+ path.dentry = sb->s_root; -+ p = d_path(&path, buf, len - strlen(p)); -+ mntput(path.mnt); -+ if (IS_ERR(p)) -+ goto out; -+ if (n != 1) -+ p[strlen(p)] = '/'; -+ -+out: -+ AuTraceErrPtr(p); -+ return p; -+} -+ -+static -+struct dentry *decode_by_path(struct super_block *sb, ino_t ino, __u32 *fh, -+ int fh_len, struct au_nfsd_si_lock *nsi_lock) -+{ -+ struct dentry *dentry, *h_parent, *root; -+ struct super_block *h_sb; -+ char *pathname, *p; -+ struct vfsmount *h_mnt; -+ struct au_branch *br; -+ int err; -+ struct path path; -+ -+ br = au_sbr(sb, nsi_lock->bindex); -+ h_mnt = au_br_mnt(br); -+ h_sb = h_mnt->mnt_sb; -+ /* todo: call lower fh_to_dentry()? fh_to_parent()? */ -+ lockdep_off(); -+ h_parent = exportfs_decode_fh(h_mnt, (void *)(fh + Fh_tail), -+ fh_len - Fh_tail, fh[Fh_h_type], -+ h_acceptable, /*context*/NULL); -+ lockdep_on(); -+ dentry = h_parent; -+ if (unlikely(!h_parent || IS_ERR(h_parent))) { -+ AuWarn1("%s decode_fh failed, %ld\n", -+ au_sbtype(h_sb), PTR_ERR(h_parent)); -+ goto out; -+ } -+ dentry = NULL; -+ if (unlikely(au_test_anon(h_parent))) { -+ AuWarn1("%s decode_fh returned a disconnected dentry\n", -+ au_sbtype(h_sb)); -+ goto out_h_parent; -+ } -+ -+ dentry = ERR_PTR(-ENOMEM); -+ pathname = (void *)__get_free_page(GFP_NOFS); -+ if (unlikely(!pathname)) -+ goto out_h_parent; -+ -+ root = sb->s_root; -+ path.mnt = h_mnt; -+ di_read_lock_parent(root, !AuLock_IR); -+ path.dentry = au_h_dptr(root, nsi_lock->bindex); -+ di_read_unlock(root, !AuLock_IR); -+ p = au_build_path(h_parent, &path, pathname, PAGE_SIZE, sb); -+ dentry = (void *)p; -+ if (IS_ERR(p)) -+ goto out_pathname; -+ -+ si_read_unlock(sb); -+ err = vfsub_kern_path(p, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path); -+ dentry = ERR_PTR(err); -+ if (unlikely(err)) -+ goto out_relock; -+ -+ dentry = ERR_PTR(-ENOENT); -+ AuDebugOn(au_test_anon(path.dentry)); -+ if (unlikely(d_really_is_negative(path.dentry))) -+ goto out_path; -+ -+ if (ino != d_inode(path.dentry)->i_ino) -+ dentry = au_lkup_by_ino(&path, ino, /*nsi_lock*/NULL); -+ else -+ dentry = dget(path.dentry); -+ -+out_path: -+ path_put(&path); -+out_relock: -+ if (unlikely(si_nfsd_read_lock(sb, nsi_lock) < 0)) -+ if (!IS_ERR(dentry)) { -+ dput(dentry); -+ dentry = ERR_PTR(-ESTALE); -+ } -+out_pathname: -+ free_page((unsigned long)pathname); -+out_h_parent: -+ dput(h_parent); -+out: -+ AuTraceErrPtr(dentry); -+ return dentry; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static struct dentry * -+aufs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, -+ int fh_type) -+{ -+ struct dentry *dentry; -+ __u32 *fh = fid->raw; -+ struct au_branch *br; -+ ino_t ino, dir_ino; -+ struct au_nfsd_si_lock nsi_lock = { -+ .force_lock = 0 -+ }; -+ -+ dentry = ERR_PTR(-ESTALE); -+ /* it should never happen, but the file handle is unreliable */ -+ if (unlikely(fh_len < Fh_tail)) -+ goto out; -+ nsi_lock.sigen = fh[Fh_sigen]; -+ nsi_lock.br_id = fh[Fh_br_id]; -+ -+ /* branch id may be wrapped around */ -+ br = NULL; -+ if (unlikely(si_nfsd_read_lock(sb, &nsi_lock))) -+ goto out; -+ nsi_lock.force_lock = 1; -+ -+ /* is this inode still cached? */ -+ ino = decode_ino(fh + Fh_ino); -+ /* it should never happen */ -+ if (unlikely(ino == AUFS_ROOT_INO)) -+ goto out_unlock; -+ -+ dir_ino = decode_ino(fh + Fh_dir_ino); -+ dentry = decode_by_ino(sb, ino, dir_ino); -+ if (IS_ERR(dentry)) -+ goto out_unlock; -+ if (dentry) -+ goto accept; -+ -+ /* is the parent dir cached? */ -+ br = au_sbr(sb, nsi_lock.bindex); -+ au_lcnt_inc(&br->br_nfiles); -+ dentry = decode_by_dir_ino(sb, ino, dir_ino, &nsi_lock); -+ if (IS_ERR(dentry)) -+ goto out_unlock; -+ if (dentry) -+ goto accept; -+ -+ /* lookup path */ -+ dentry = decode_by_path(sb, ino, fh, fh_len, &nsi_lock); -+ if (IS_ERR(dentry)) -+ goto out_unlock; -+ if (unlikely(!dentry)) -+ /* todo?: make it ESTALE */ -+ goto out_unlock; -+ -+accept: -+ if (!au_digen_test(dentry, au_sigen(sb)) -+ && d_inode(dentry)->i_generation == fh[Fh_igen]) -+ goto out_unlock; /* success */ -+ -+ dput(dentry); -+ dentry = ERR_PTR(-ESTALE); -+out_unlock: -+ if (br) -+ au_lcnt_dec(&br->br_nfiles); -+ si_read_unlock(sb); -+out: -+ AuTraceErrPtr(dentry); -+ return dentry; -+} -+ -+#if 0 /* reserved for future use */ -+/* support subtreecheck option */ -+static struct dentry *aufs_fh_to_parent(struct super_block *sb, struct fid *fid, -+ int fh_len, int fh_type) -+{ -+ struct dentry *parent; -+ __u32 *fh = fid->raw; -+ ino_t dir_ino; -+ -+ dir_ino = decode_ino(fh + Fh_dir_ino); -+ parent = decode_by_ino(sb, dir_ino, 0); -+ if (IS_ERR(parent)) -+ goto out; -+ if (!parent) -+ parent = decode_by_path(sb, au_br_index(sb, fh[Fh_br_id]), -+ dir_ino, fh, fh_len); -+ -+out: -+ AuTraceErrPtr(parent); -+ return parent; -+} -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int aufs_encode_fh(struct inode *inode, __u32 *fh, int *max_len, -+ struct inode *dir) -+{ -+ int err; -+ aufs_bindex_t bindex; -+ struct super_block *sb, *h_sb; -+ struct dentry *dentry, *parent, *h_parent; -+ struct inode *h_dir; -+ struct au_branch *br; -+ -+ err = -ENOSPC; -+ if (unlikely(*max_len <= Fh_tail)) { -+ AuWarn1("NFSv2 client (max_len %d)?\n", *max_len); -+ goto out; -+ } -+ -+ err = FILEID_ROOT; -+ if (inode->i_ino == AUFS_ROOT_INO) { -+ AuDebugOn(inode->i_ino != AUFS_ROOT_INO); -+ goto out; -+ } -+ -+ h_parent = NULL; -+ sb = inode->i_sb; -+ err = si_read_lock(sb, AuLock_FLUSH); -+ if (unlikely(err)) -+ goto out; -+ -+#ifdef CONFIG_AUFS_DEBUG -+ if (unlikely(!au_opt_test(au_mntflags(sb), XINO))) -+ AuWarn1("NFS-exporting requires xino\n"); -+#endif -+ err = -EIO; -+ parent = NULL; -+ ii_read_lock_child(inode); -+ bindex = au_ibtop(inode); -+ if (!dir) { -+ dentry = d_find_any_alias(inode); -+ if (unlikely(!dentry)) -+ goto out_unlock; -+ AuDebugOn(au_test_anon(dentry)); -+ parent = dget_parent(dentry); -+ dput(dentry); -+ if (unlikely(!parent)) -+ goto out_unlock; -+ if (d_really_is_positive(parent)) -+ dir = d_inode(parent); -+ } -+ -+ ii_read_lock_parent(dir); -+ h_dir = au_h_iptr(dir, bindex); -+ ii_read_unlock(dir); -+ if (unlikely(!h_dir)) -+ goto out_parent; -+ h_parent = d_find_any_alias(h_dir); -+ if (unlikely(!h_parent)) -+ goto out_hparent; -+ -+ err = -EPERM; -+ br = au_sbr(sb, bindex); -+ h_sb = au_br_sb(br); -+ if (unlikely(!h_sb->s_export_op)) { -+ AuErr1("%s branch is not exportable\n", au_sbtype(h_sb)); -+ goto out_hparent; -+ } -+ -+ fh[Fh_br_id] = br->br_id; -+ fh[Fh_sigen] = au_sigen(sb); -+ encode_ino(fh + Fh_ino, inode->i_ino); -+ encode_ino(fh + Fh_dir_ino, dir->i_ino); -+ fh[Fh_igen] = inode->i_generation; -+ -+ *max_len -= Fh_tail; -+ fh[Fh_h_type] = exportfs_encode_fh(h_parent, (void *)(fh + Fh_tail), -+ max_len, -+ /*connectable or subtreecheck*/0); -+ err = fh[Fh_h_type]; -+ *max_len += Fh_tail; -+ /* todo: macros? */ -+ if (err != FILEID_INVALID) -+ err = 99; -+ else -+ AuWarn1("%s encode_fh failed\n", au_sbtype(h_sb)); -+ -+out_hparent: -+ dput(h_parent); -+out_parent: -+ dput(parent); -+out_unlock: -+ ii_read_unlock(inode); -+ si_read_unlock(sb); -+out: -+ if (unlikely(err < 0)) -+ err = FILEID_INVALID; -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int aufs_commit_metadata(struct inode *inode) -+{ -+ int err; -+ aufs_bindex_t bindex; -+ struct super_block *sb; -+ struct inode *h_inode; -+ int (*f)(struct inode *inode); -+ -+ sb = inode->i_sb; -+ si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); -+ ii_write_lock_child(inode); -+ bindex = au_ibtop(inode); -+ AuDebugOn(bindex < 0); -+ h_inode = au_h_iptr(inode, bindex); -+ -+ f = h_inode->i_sb->s_export_op->commit_metadata; -+ if (f) -+ err = f(h_inode); -+ else { -+ struct writeback_control wbc = { -+ .sync_mode = WB_SYNC_ALL, -+ .nr_to_write = 0 /* metadata only */ -+ }; -+ -+ err = sync_inode(h_inode, &wbc); -+ } -+ -+ au_cpup_attr_timesizes(inode); -+ ii_write_unlock(inode); -+ si_read_unlock(sb); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static struct export_operations aufs_export_op = { -+ .fh_to_dentry = aufs_fh_to_dentry, -+ /* .fh_to_parent = aufs_fh_to_parent, */ -+ .encode_fh = aufs_encode_fh, -+ .commit_metadata = aufs_commit_metadata -+}; -+ -+void au_export_init(struct super_block *sb) -+{ -+ struct au_sbinfo *sbinfo; -+ __u32 u; -+ -+ BUILD_BUG_ON_MSG(IS_BUILTIN(CONFIG_AUFS_FS) -+ && IS_MODULE(CONFIG_EXPORTFS), -+ AUFS_NAME ": unsupported configuration " -+ "CONFIG_EXPORTFS=m and CONFIG_AUFS_FS=y"); -+ -+ sb->s_export_op = &aufs_export_op; -+ sbinfo = au_sbi(sb); -+ sbinfo->si_xigen = NULL; -+ get_random_bytes(&u, sizeof(u)); -+ BUILD_BUG_ON(sizeof(u) != sizeof(int)); -+ atomic_set(&sbinfo->si_xigen_next, u); -+} -diff --git a/fs/aufs/f_op.c b/fs/aufs/f_op.c -new file mode 100644 -index 000000000000..5254b5cd3942 ---- /dev/null -+++ b/fs/aufs/f_op.c -@@ -0,0 +1,819 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * file and vm operations -+ */ -+ -+#include <linux/aio.h> -+#include <linux/fs_stack.h> -+#include <linux/mman.h> -+#include <linux/security.h> -+#include "aufs.h" -+ -+int au_do_open_nondir(struct file *file, int flags, struct file *h_file) -+{ -+ int err; -+ aufs_bindex_t bindex; -+ struct dentry *dentry, *h_dentry; -+ struct au_finfo *finfo; -+ struct inode *h_inode; -+ -+ FiMustWriteLock(file); -+ -+ err = 0; -+ dentry = file->f_path.dentry; -+ AuDebugOn(IS_ERR_OR_NULL(dentry)); -+ finfo = au_fi(file); -+ memset(&finfo->fi_htop, 0, sizeof(finfo->fi_htop)); -+ atomic_set(&finfo->fi_mmapped, 0); -+ bindex = au_dbtop(dentry); -+ if (!h_file) { -+ h_dentry = au_h_dptr(dentry, bindex); -+ err = vfsub_test_mntns(file->f_path.mnt, h_dentry->d_sb); -+ if (unlikely(err)) -+ goto out; -+ h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0); -+ if (IS_ERR(h_file)) { -+ err = PTR_ERR(h_file); -+ goto out; -+ } -+ } else { -+ h_dentry = h_file->f_path.dentry; -+ err = vfsub_test_mntns(file->f_path.mnt, h_dentry->d_sb); -+ if (unlikely(err)) -+ goto out; -+ /* br ref is already inc-ed */ -+ } -+ -+ if ((flags & __O_TMPFILE) -+ && !(flags & O_EXCL)) { -+ h_inode = file_inode(h_file); -+ spin_lock(&h_inode->i_lock); -+ h_inode->i_state |= I_LINKABLE; -+ spin_unlock(&h_inode->i_lock); -+ } -+ au_set_fbtop(file, bindex); -+ au_set_h_fptr(file, bindex, h_file); -+ au_update_figen(file); -+ /* todo: necessary? */ -+ /* file->f_ra = h_file->f_ra; */ -+ -+out: -+ return err; -+} -+ -+static int aufs_open_nondir(struct inode *inode __maybe_unused, -+ struct file *file) -+{ -+ int err; -+ struct super_block *sb; -+ struct au_do_open_args args = { -+ .open = au_do_open_nondir -+ }; -+ -+ AuDbg("%pD, f_flags 0x%x, f_mode 0x%x\n", -+ file, vfsub_file_flags(file), file->f_mode); -+ -+ sb = file->f_path.dentry->d_sb; -+ si_read_lock(sb, AuLock_FLUSH); -+ err = au_do_open(file, &args); -+ si_read_unlock(sb); -+ return err; -+} -+ -+int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file) -+{ -+ struct au_finfo *finfo; -+ aufs_bindex_t bindex; -+ -+ finfo = au_fi(file); -+ au_hbl_del(&finfo->fi_hlist, -+ &au_sbi(file->f_path.dentry->d_sb)->si_files); -+ bindex = finfo->fi_btop; -+ if (bindex >= 0) -+ au_set_h_fptr(file, bindex, NULL); -+ -+ au_finfo_fin(file); -+ return 0; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_do_flush_nondir(struct file *file, fl_owner_t id) -+{ -+ int err; -+ struct file *h_file; -+ -+ err = 0; -+ h_file = au_hf_top(file); -+ if (h_file) -+ err = vfsub_flush(h_file, id); -+ return err; -+} -+ -+static int aufs_flush_nondir(struct file *file, fl_owner_t id) -+{ -+ return au_do_flush(file, id, au_do_flush_nondir); -+} -+ -+/* ---------------------------------------------------------------------- */ -+/* -+ * read and write functions acquire [fdi]_rwsem once, but release before -+ * mmap_sem. This is because to stop a race condition between mmap(2). -+ * Releasing these aufs-rwsem should be safe, no branch-management (by keeping -+ * si_rwsem), no harmful copy-up should happen. Actually copy-up may happen in -+ * read functions after [fdi]_rwsem are released, but it should be harmless. -+ */ -+ -+/* Callers should call au_read_post() or fput() in the end */ -+struct file *au_read_pre(struct file *file, int keep_fi, unsigned int lsc) -+{ -+ struct file *h_file; -+ int err; -+ -+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0, lsc); -+ if (!err) { -+ di_read_unlock(file->f_path.dentry, AuLock_IR); -+ h_file = au_hf_top(file); -+ get_file(h_file); -+ if (!keep_fi) -+ fi_read_unlock(file); -+ } else -+ h_file = ERR_PTR(err); -+ -+ return h_file; -+} -+ -+static void au_read_post(struct inode *inode, struct file *h_file) -+{ -+ /* update without lock, I don't think it a problem */ -+ fsstack_copy_attr_atime(inode, file_inode(h_file)); -+ fput(h_file); -+} -+ -+struct au_write_pre { -+ /* input */ -+ unsigned int lsc; -+ -+ /* output */ -+ blkcnt_t blks; -+ aufs_bindex_t btop; -+}; -+ -+/* -+ * return with iinfo is write-locked -+ * callers should call au_write_post() or iinfo_write_unlock() + fput() in the -+ * end -+ */ -+static struct file *au_write_pre(struct file *file, int do_ready, -+ struct au_write_pre *wpre) -+{ -+ struct file *h_file; -+ struct dentry *dentry; -+ int err; -+ unsigned int lsc; -+ struct au_pin pin; -+ -+ lsc = 0; -+ if (wpre) -+ lsc = wpre->lsc; -+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1, lsc); -+ h_file = ERR_PTR(err); -+ if (unlikely(err)) -+ goto out; -+ -+ dentry = file->f_path.dentry; -+ if (do_ready) { -+ err = au_ready_to_write(file, -1, &pin); -+ if (unlikely(err)) { -+ h_file = ERR_PTR(err); -+ di_write_unlock(dentry); -+ goto out_fi; -+ } -+ } -+ -+ di_downgrade_lock(dentry, /*flags*/0); -+ if (wpre) -+ wpre->btop = au_fbtop(file); -+ h_file = au_hf_top(file); -+ get_file(h_file); -+ if (wpre) -+ wpre->blks = file_inode(h_file)->i_blocks; -+ if (do_ready) -+ au_unpin(&pin); -+ di_read_unlock(dentry, /*flags*/0); -+ -+out_fi: -+ fi_write_unlock(file); -+out: -+ return h_file; -+} -+ -+static void au_write_post(struct inode *inode, struct file *h_file, -+ struct au_write_pre *wpre, ssize_t written) -+{ -+ struct inode *h_inode; -+ -+ au_cpup_attr_timesizes(inode); -+ AuDebugOn(au_ibtop(inode) != wpre->btop); -+ h_inode = file_inode(h_file); -+ inode->i_mode = h_inode->i_mode; -+ ii_write_unlock(inode); -+ /* AuDbg("blks %llu, %llu\n", (u64)blks, (u64)h_inode->i_blocks); */ -+ if (written > 0) -+ au_fhsm_wrote(inode->i_sb, wpre->btop, -+ /*force*/h_inode->i_blocks > wpre->blks); -+ fput(h_file); -+} -+ -+static ssize_t aufs_read(struct file *file, char __user *buf, size_t count, -+ loff_t *ppos) -+{ -+ ssize_t err; -+ struct inode *inode; -+ struct file *h_file; -+ struct super_block *sb; -+ -+ inode = file_inode(file); -+ sb = inode->i_sb; -+ si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); -+ -+ h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out; -+ -+ /* filedata may be obsoleted by concurrent copyup, but no problem */ -+ err = vfsub_read_u(h_file, buf, count, ppos); -+ /* todo: necessary? */ -+ /* file->f_ra = h_file->f_ra; */ -+ au_read_post(inode, h_file); -+ -+out: -+ si_read_unlock(sb); -+ return err; -+} -+ -+/* -+ * todo: very ugly -+ * it locks both of i_mutex and si_rwsem for read in safe. -+ * if the plink maintenance mode continues forever (that is the problem), -+ * may loop forever. -+ */ -+static void au_mtx_and_read_lock(struct inode *inode) -+{ -+ int err; -+ struct super_block *sb = inode->i_sb; -+ -+ while (1) { -+ inode_lock(inode); -+ err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); -+ if (!err) -+ break; -+ inode_unlock(inode); -+ si_read_lock(sb, AuLock_NOPLMW); -+ si_read_unlock(sb); -+ } -+} -+ -+static ssize_t aufs_write(struct file *file, const char __user *ubuf, -+ size_t count, loff_t *ppos) -+{ -+ ssize_t err; -+ struct au_write_pre wpre; -+ struct inode *inode; -+ struct file *h_file; -+ char __user *buf = (char __user *)ubuf; -+ -+ inode = file_inode(file); -+ au_mtx_and_read_lock(inode); -+ -+ wpre.lsc = 0; -+ h_file = au_write_pre(file, /*do_ready*/1, &wpre); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out; -+ -+ err = vfsub_write_u(h_file, buf, count, ppos); -+ au_write_post(inode, h_file, &wpre, err); -+ -+out: -+ si_read_unlock(inode->i_sb); -+ inode_unlock(inode); -+ return err; -+} -+ -+static ssize_t au_do_iter(struct file *h_file, int rw, struct kiocb *kio, -+ struct iov_iter *iov_iter) -+{ -+ ssize_t err; -+ struct file *file; -+ ssize_t (*iter)(struct kiocb *, struct iov_iter *); -+ -+ err = security_file_permission(h_file, rw); -+ if (unlikely(err)) -+ goto out; -+ -+ err = -ENOSYS; -+ iter = NULL; -+ if (rw == MAY_READ) -+ iter = h_file->f_op->read_iter; -+ else if (rw == MAY_WRITE) -+ iter = h_file->f_op->write_iter; -+ -+ file = kio->ki_filp; -+ kio->ki_filp = h_file; -+ if (iter) { -+ lockdep_off(); -+ err = iter(kio, iov_iter); -+ lockdep_on(); -+ } else -+ /* currently there is no such fs */ -+ WARN_ON_ONCE(1); -+ kio->ki_filp = file; -+ -+out: -+ return err; -+} -+ -+static ssize_t aufs_read_iter(struct kiocb *kio, struct iov_iter *iov_iter) -+{ -+ ssize_t err; -+ struct file *file, *h_file; -+ struct inode *inode; -+ struct super_block *sb; -+ -+ file = kio->ki_filp; -+ inode = file_inode(file); -+ sb = inode->i_sb; -+ si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); -+ -+ h_file = au_read_pre(file, /*keep_fi*/1, /*lsc*/0); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out; -+ -+ if (au_test_loopback_kthread()) { -+ au_warn_loopback(h_file->f_path.dentry->d_sb); -+ if (file->f_mapping != h_file->f_mapping) { -+ file->f_mapping = h_file->f_mapping; -+ smp_mb(); /* unnecessary? */ -+ } -+ } -+ fi_read_unlock(file); -+ -+ err = au_do_iter(h_file, MAY_READ, kio, iov_iter); -+ /* todo: necessary? */ -+ /* file->f_ra = h_file->f_ra; */ -+ au_read_post(inode, h_file); -+ -+out: -+ si_read_unlock(sb); -+ return err; -+} -+ -+static ssize_t aufs_write_iter(struct kiocb *kio, struct iov_iter *iov_iter) -+{ -+ ssize_t err; -+ struct au_write_pre wpre; -+ struct inode *inode; -+ struct file *file, *h_file; -+ -+ file = kio->ki_filp; -+ inode = file_inode(file); -+ au_mtx_and_read_lock(inode); -+ -+ wpre.lsc = 0; -+ h_file = au_write_pre(file, /*do_ready*/1, &wpre); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out; -+ -+ err = au_do_iter(h_file, MAY_WRITE, kio, iov_iter); -+ au_write_post(inode, h_file, &wpre, err); -+ -+out: -+ si_read_unlock(inode->i_sb); -+ inode_unlock(inode); -+ return err; -+} -+ -+static ssize_t aufs_splice_read(struct file *file, loff_t *ppos, -+ struct pipe_inode_info *pipe, size_t len, -+ unsigned int flags) -+{ -+ ssize_t err; -+ struct file *h_file; -+ struct inode *inode; -+ struct super_block *sb; -+ -+ inode = file_inode(file); -+ sb = inode->i_sb; -+ si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); -+ -+ h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out; -+ -+ err = vfsub_splice_to(h_file, ppos, pipe, len, flags); -+ /* todo: necessary? */ -+ /* file->f_ra = h_file->f_ra; */ -+ au_read_post(inode, h_file); -+ -+out: -+ si_read_unlock(sb); -+ return err; -+} -+ -+static ssize_t -+aufs_splice_write(struct pipe_inode_info *pipe, struct file *file, loff_t *ppos, -+ size_t len, unsigned int flags) -+{ -+ ssize_t err; -+ struct au_write_pre wpre; -+ struct inode *inode; -+ struct file *h_file; -+ -+ inode = file_inode(file); -+ au_mtx_and_read_lock(inode); -+ -+ wpre.lsc = 0; -+ h_file = au_write_pre(file, /*do_ready*/1, &wpre); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out; -+ -+ err = vfsub_splice_from(pipe, h_file, ppos, len, flags); -+ au_write_post(inode, h_file, &wpre, err); -+ -+out: -+ si_read_unlock(inode->i_sb); -+ inode_unlock(inode); -+ return err; -+} -+ -+static long aufs_fallocate(struct file *file, int mode, loff_t offset, -+ loff_t len) -+{ -+ long err; -+ struct au_write_pre wpre; -+ struct inode *inode; -+ struct file *h_file; -+ -+ inode = file_inode(file); -+ au_mtx_and_read_lock(inode); -+ -+ wpre.lsc = 0; -+ h_file = au_write_pre(file, /*do_ready*/1, &wpre); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out; -+ -+ lockdep_off(); -+ err = vfs_fallocate(h_file, mode, offset, len); -+ lockdep_on(); -+ au_write_post(inode, h_file, &wpre, /*written*/1); -+ -+out: -+ si_read_unlock(inode->i_sb); -+ inode_unlock(inode); -+ return err; -+} -+ -+static ssize_t aufs_copy_file_range(struct file *src, loff_t src_pos, -+ struct file *dst, loff_t dst_pos, -+ size_t len, unsigned int flags) -+{ -+ ssize_t err; -+ struct au_write_pre wpre; -+ enum { SRC, DST }; -+ struct { -+ struct inode *inode; -+ struct file *h_file; -+ struct super_block *h_sb; -+ } a[2]; -+#define a_src a[SRC] -+#define a_dst a[DST] -+ -+ err = -EINVAL; -+ a_src.inode = file_inode(src); -+ if (unlikely(!S_ISREG(a_src.inode->i_mode))) -+ goto out; -+ a_dst.inode = file_inode(dst); -+ if (unlikely(!S_ISREG(a_dst.inode->i_mode))) -+ goto out; -+ -+ au_mtx_and_read_lock(a_dst.inode); -+ /* -+ * in order to match the order in di_write_lock2_{child,parent}(), -+ * use f_path.dentry for this comparison. -+ */ -+ if (src->f_path.dentry < dst->f_path.dentry) { -+ a_src.h_file = au_read_pre(src, /*keep_fi*/1, AuLsc_FI_1); -+ err = PTR_ERR(a_src.h_file); -+ if (IS_ERR(a_src.h_file)) -+ goto out_si; -+ -+ wpre.lsc = AuLsc_FI_2; -+ a_dst.h_file = au_write_pre(dst, /*do_ready*/1, &wpre); -+ err = PTR_ERR(a_dst.h_file); -+ if (IS_ERR(a_dst.h_file)) { -+ au_read_post(a_src.inode, a_src.h_file); -+ goto out_si; -+ } -+ } else { -+ wpre.lsc = AuLsc_FI_1; -+ a_dst.h_file = au_write_pre(dst, /*do_ready*/1, &wpre); -+ err = PTR_ERR(a_dst.h_file); -+ if (IS_ERR(a_dst.h_file)) -+ goto out_si; -+ -+ a_src.h_file = au_read_pre(src, /*keep_fi*/1, AuLsc_FI_2); -+ err = PTR_ERR(a_src.h_file); -+ if (IS_ERR(a_src.h_file)) { -+ au_write_post(a_dst.inode, a_dst.h_file, &wpre, -+ /*written*/0); -+ goto out_si; -+ } -+ } -+ -+ err = -EXDEV; -+ a_src.h_sb = file_inode(a_src.h_file)->i_sb; -+ a_dst.h_sb = file_inode(a_dst.h_file)->i_sb; -+ if (unlikely(a_src.h_sb != a_dst.h_sb)) { -+ AuDbgFile(src); -+ AuDbgFile(dst); -+ goto out_file; -+ } -+ -+ err = vfsub_copy_file_range(a_src.h_file, src_pos, a_dst.h_file, -+ dst_pos, len, flags); -+ -+out_file: -+ au_write_post(a_dst.inode, a_dst.h_file, &wpre, err); -+ fi_read_unlock(src); -+ au_read_post(a_src.inode, a_src.h_file); -+out_si: -+ si_read_unlock(a_dst.inode->i_sb); -+ inode_unlock(a_dst.inode); -+out: -+ return err; -+#undef a_src -+#undef a_dst -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * The locking order around current->mmap_sem. -+ * - in most and regular cases -+ * file I/O syscall -- aufs_read() or something -+ * -- si_rwsem for read -- mmap_sem -+ * (Note that [fdi]i_rwsem are released before mmap_sem). -+ * - in mmap case -+ * mmap(2) -- mmap_sem -- aufs_mmap() -- si_rwsem for read -- [fdi]i_rwsem -+ * This AB-BA order is definitely bad, but is not a problem since "si_rwsem for -+ * read" allows multiple processes to acquire it and [fdi]i_rwsem are not held -+ * in file I/O. Aufs needs to stop lockdep in aufs_mmap() though. -+ * It means that when aufs acquires si_rwsem for write, the process should never -+ * acquire mmap_sem. -+ * -+ * Actually aufs_iterate() holds [fdi]i_rwsem before mmap_sem, but this is not a -+ * problem either since any directory is not able to be mmap-ed. -+ * The similar scenario is applied to aufs_readlink() too. -+ */ -+ -+#if 0 /* stop calling security_file_mmap() */ -+/* cf. linux/include/linux/mman.h: calc_vm_prot_bits() */ -+#define AuConv_VM_PROT(f, b) _calc_vm_trans(f, VM_##b, PROT_##b) -+ -+static unsigned long au_arch_prot_conv(unsigned long flags) -+{ -+ /* currently ppc64 only */ -+#ifdef CONFIG_PPC64 -+ /* cf. linux/arch/powerpc/include/asm/mman.h */ -+ AuDebugOn(arch_calc_vm_prot_bits(-1) != VM_SAO); -+ return AuConv_VM_PROT(flags, SAO); -+#else -+ AuDebugOn(arch_calc_vm_prot_bits(-1)); -+ return 0; -+#endif -+} -+ -+static unsigned long au_prot_conv(unsigned long flags) -+{ -+ return AuConv_VM_PROT(flags, READ) -+ | AuConv_VM_PROT(flags, WRITE) -+ | AuConv_VM_PROT(flags, EXEC) -+ | au_arch_prot_conv(flags); -+} -+ -+/* cf. linux/include/linux/mman.h: calc_vm_flag_bits() */ -+#define AuConv_VM_MAP(f, b) _calc_vm_trans(f, VM_##b, MAP_##b) -+ -+static unsigned long au_flag_conv(unsigned long flags) -+{ -+ return AuConv_VM_MAP(flags, GROWSDOWN) -+ | AuConv_VM_MAP(flags, DENYWRITE) -+ | AuConv_VM_MAP(flags, LOCKED); -+} -+#endif -+ -+static int aufs_mmap(struct file *file, struct vm_area_struct *vma) -+{ -+ int err; -+ const unsigned char wlock -+ = (file->f_mode & FMODE_WRITE) && (vma->vm_flags & VM_SHARED); -+ struct super_block *sb; -+ struct file *h_file; -+ struct inode *inode; -+ -+ AuDbgVmRegion(file, vma); -+ -+ inode = file_inode(file); -+ sb = inode->i_sb; -+ lockdep_off(); -+ si_read_lock(sb, AuLock_NOPLMW); -+ -+ h_file = au_write_pre(file, wlock, /*wpre*/NULL); -+ lockdep_on(); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out; -+ -+ err = 0; -+ au_set_mmapped(file); -+ au_vm_file_reset(vma, h_file); -+ /* -+ * we cannot call security_mmap_file() here since it may acquire -+ * mmap_sem or i_mutex. -+ * -+ * err = security_mmap_file(h_file, au_prot_conv(vma->vm_flags), -+ * au_flag_conv(vma->vm_flags)); -+ */ -+ if (!err) -+ err = call_mmap(h_file, vma); -+ if (!err) { -+ au_vm_prfile_set(vma, file); -+ fsstack_copy_attr_atime(inode, file_inode(h_file)); -+ goto out_fput; /* success */ -+ } -+ au_unset_mmapped(file); -+ au_vm_file_reset(vma, file); -+ -+out_fput: -+ lockdep_off(); -+ ii_write_unlock(inode); -+ lockdep_on(); -+ fput(h_file); -+out: -+ lockdep_off(); -+ si_read_unlock(sb); -+ lockdep_on(); -+ AuTraceErr(err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int aufs_fsync_nondir(struct file *file, loff_t start, loff_t end, -+ int datasync) -+{ -+ int err; -+ struct au_write_pre wpre; -+ struct inode *inode; -+ struct file *h_file; -+ -+ err = 0; /* -EBADF; */ /* posix? */ -+ if (unlikely(!(file->f_mode & FMODE_WRITE))) -+ goto out; -+ -+ inode = file_inode(file); -+ au_mtx_and_read_lock(inode); -+ -+ wpre.lsc = 0; -+ h_file = au_write_pre(file, /*do_ready*/1, &wpre); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out_unlock; -+ -+ err = vfsub_fsync(h_file, &h_file->f_path, datasync); -+ au_write_post(inode, h_file, &wpre, /*written*/0); -+ -+out_unlock: -+ si_read_unlock(inode->i_sb); -+ inode_unlock(inode); -+out: -+ return err; -+} -+ -+static int aufs_fasync(int fd, struct file *file, int flag) -+{ -+ int err; -+ struct file *h_file; -+ struct super_block *sb; -+ -+ sb = file->f_path.dentry->d_sb; -+ si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); -+ -+ h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out; -+ -+ if (h_file->f_op->fasync) -+ err = h_file->f_op->fasync(fd, h_file, flag); -+ fput(h_file); /* instead of au_read_post() */ -+ -+out: -+ si_read_unlock(sb); -+ return err; -+} -+ -+static int aufs_setfl(struct file *file, unsigned long arg) -+{ -+ int err; -+ struct file *h_file; -+ struct super_block *sb; -+ -+ sb = file->f_path.dentry->d_sb; -+ si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); -+ -+ h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out; -+ -+ /* stop calling h_file->fasync */ -+ arg |= vfsub_file_flags(file) & FASYNC; -+ err = setfl(/*unused fd*/-1, h_file, arg); -+ fput(h_file); /* instead of au_read_post() */ -+ -+out: -+ si_read_unlock(sb); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* no one supports this operation, currently */ -+#if 0 -+static ssize_t aufs_sendpage(struct file *file, struct page *page, int offset, -+ size_t len, loff_t *pos, int more) -+{ -+} -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+const struct file_operations aufs_file_fop = { -+ .owner = THIS_MODULE, -+ -+ .llseek = default_llseek, -+ -+ .read = aufs_read, -+ .write = aufs_write, -+ .read_iter = aufs_read_iter, -+ .write_iter = aufs_write_iter, -+ -+#ifdef CONFIG_AUFS_POLL -+ .poll = aufs_poll, -+#endif -+ .unlocked_ioctl = aufs_ioctl_nondir, -+#ifdef CONFIG_COMPAT -+ .compat_ioctl = aufs_compat_ioctl_nondir, -+#endif -+ .mmap = aufs_mmap, -+ .open = aufs_open_nondir, -+ .flush = aufs_flush_nondir, -+ .release = aufs_release_nondir, -+ .fsync = aufs_fsync_nondir, -+ .fasync = aufs_fasync, -+ /* .sendpage = aufs_sendpage, */ -+ .setfl = aufs_setfl, -+ .splice_write = aufs_splice_write, -+ .splice_read = aufs_splice_read, -+#if 0 -+ .aio_splice_write = aufs_aio_splice_write, -+ .aio_splice_read = aufs_aio_splice_read, -+#endif -+ .fallocate = aufs_fallocate, -+ .copy_file_range = aufs_copy_file_range -+}; -diff --git a/fs/aufs/fhsm.c b/fs/aufs/fhsm.c -new file mode 100644 -index 000000000000..f86a4c24fb26 ---- /dev/null -+++ b/fs/aufs/fhsm.c -@@ -0,0 +1,427 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2011-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program; if not, write to the Free Software -+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA -+ */ -+ -+/* -+ * File-based Hierarchy Storage Management -+ */ -+ -+#include <linux/anon_inodes.h> -+#include <linux/poll.h> -+#include <linux/seq_file.h> -+#include <linux/statfs.h> -+#include "aufs.h" -+ -+static aufs_bindex_t au_fhsm_bottom(struct super_block *sb) -+{ -+ struct au_sbinfo *sbinfo; -+ struct au_fhsm *fhsm; -+ -+ SiMustAnyLock(sb); -+ -+ sbinfo = au_sbi(sb); -+ fhsm = &sbinfo->si_fhsm; -+ AuDebugOn(!fhsm); -+ return fhsm->fhsm_bottom; -+} -+ -+void au_fhsm_set_bottom(struct super_block *sb, aufs_bindex_t bindex) -+{ -+ struct au_sbinfo *sbinfo; -+ struct au_fhsm *fhsm; -+ -+ SiMustWriteLock(sb); -+ -+ sbinfo = au_sbi(sb); -+ fhsm = &sbinfo->si_fhsm; -+ AuDebugOn(!fhsm); -+ fhsm->fhsm_bottom = bindex; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_fhsm_test_jiffy(struct au_sbinfo *sbinfo, struct au_branch *br) -+{ -+ struct au_br_fhsm *bf; -+ -+ bf = br->br_fhsm; -+ MtxMustLock(&bf->bf_lock); -+ -+ return !bf->bf_readable -+ || time_after(jiffies, -+ bf->bf_jiffy + sbinfo->si_fhsm.fhsm_expire); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static void au_fhsm_notify(struct super_block *sb, int val) -+{ -+ struct au_sbinfo *sbinfo; -+ struct au_fhsm *fhsm; -+ -+ SiMustAnyLock(sb); -+ -+ sbinfo = au_sbi(sb); -+ fhsm = &sbinfo->si_fhsm; -+ if (au_fhsm_pid(fhsm) -+ && atomic_read(&fhsm->fhsm_readable) != -1) { -+ atomic_set(&fhsm->fhsm_readable, val); -+ if (val) -+ wake_up(&fhsm->fhsm_wqh); -+ } -+} -+ -+static int au_fhsm_stfs(struct super_block *sb, aufs_bindex_t bindex, -+ struct aufs_stfs *rstfs, int do_lock, int do_notify) -+{ -+ int err; -+ struct au_branch *br; -+ struct au_br_fhsm *bf; -+ -+ br = au_sbr(sb, bindex); -+ AuDebugOn(au_br_rdonly(br)); -+ bf = br->br_fhsm; -+ AuDebugOn(!bf); -+ -+ if (do_lock) -+ mutex_lock(&bf->bf_lock); -+ else -+ MtxMustLock(&bf->bf_lock); -+ -+ /* sb->s_root for NFS is unreliable */ -+ err = au_br_stfs(br, &bf->bf_stfs); -+ if (unlikely(err)) { -+ AuErr1("FHSM failed (%d), b%d, ignored.\n", bindex, err); -+ goto out; -+ } -+ -+ bf->bf_jiffy = jiffies; -+ bf->bf_readable = 1; -+ if (do_notify) -+ au_fhsm_notify(sb, /*val*/1); -+ if (rstfs) -+ *rstfs = bf->bf_stfs; -+ -+out: -+ if (do_lock) -+ mutex_unlock(&bf->bf_lock); -+ au_fhsm_notify(sb, /*val*/1); -+ -+ return err; -+} -+ -+void au_fhsm_wrote(struct super_block *sb, aufs_bindex_t bindex, int force) -+{ -+ int err; -+ struct au_sbinfo *sbinfo; -+ struct au_fhsm *fhsm; -+ struct au_branch *br; -+ struct au_br_fhsm *bf; -+ -+ AuDbg("b%d, force %d\n", bindex, force); -+ SiMustAnyLock(sb); -+ -+ sbinfo = au_sbi(sb); -+ fhsm = &sbinfo->si_fhsm; -+ if (!au_ftest_si(sbinfo, FHSM) -+ || fhsm->fhsm_bottom == bindex) -+ return; -+ -+ br = au_sbr(sb, bindex); -+ bf = br->br_fhsm; -+ AuDebugOn(!bf); -+ mutex_lock(&bf->bf_lock); -+ if (force -+ || au_fhsm_pid(fhsm) -+ || au_fhsm_test_jiffy(sbinfo, br)) -+ err = au_fhsm_stfs(sb, bindex, /*rstfs*/NULL, /*do_lock*/0, -+ /*do_notify*/1); -+ mutex_unlock(&bf->bf_lock); -+} -+ -+void au_fhsm_wrote_all(struct super_block *sb, int force) -+{ -+ aufs_bindex_t bindex, bbot; -+ struct au_branch *br; -+ -+ /* exclude the bottom */ -+ bbot = au_fhsm_bottom(sb); -+ for (bindex = 0; bindex < bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ if (au_br_fhsm(br->br_perm)) -+ au_fhsm_wrote(sb, bindex, force); -+ } -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static __poll_t au_fhsm_poll(struct file *file, struct poll_table_struct *wait) -+{ -+ __poll_t mask; -+ struct au_sbinfo *sbinfo; -+ struct au_fhsm *fhsm; -+ -+ mask = 0; -+ sbinfo = file->private_data; -+ fhsm = &sbinfo->si_fhsm; -+ poll_wait(file, &fhsm->fhsm_wqh, wait); -+ if (atomic_read(&fhsm->fhsm_readable)) -+ mask = EPOLLIN /* | EPOLLRDNORM */; -+ -+ if (!mask) -+ AuDbg("mask 0x%x\n", mask); -+ return mask; -+} -+ -+static int au_fhsm_do_read_one(struct aufs_stbr __user *stbr, -+ struct aufs_stfs *stfs, __s16 brid) -+{ -+ int err; -+ -+ err = copy_to_user(&stbr->stfs, stfs, sizeof(*stfs)); -+ if (!err) -+ err = __put_user(brid, &stbr->brid); -+ if (unlikely(err)) -+ err = -EFAULT; -+ -+ return err; -+} -+ -+static ssize_t au_fhsm_do_read(struct super_block *sb, -+ struct aufs_stbr __user *stbr, size_t count) -+{ -+ ssize_t err; -+ int nstbr; -+ aufs_bindex_t bindex, bbot; -+ struct au_branch *br; -+ struct au_br_fhsm *bf; -+ -+ /* except the bottom branch */ -+ err = 0; -+ nstbr = 0; -+ bbot = au_fhsm_bottom(sb); -+ for (bindex = 0; !err && bindex < bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ if (!au_br_fhsm(br->br_perm)) -+ continue; -+ -+ bf = br->br_fhsm; -+ mutex_lock(&bf->bf_lock); -+ if (bf->bf_readable) { -+ err = -EFAULT; -+ if (count >= sizeof(*stbr)) -+ err = au_fhsm_do_read_one(stbr++, &bf->bf_stfs, -+ br->br_id); -+ if (!err) { -+ bf->bf_readable = 0; -+ count -= sizeof(*stbr); -+ nstbr++; -+ } -+ } -+ mutex_unlock(&bf->bf_lock); -+ } -+ if (!err) -+ err = sizeof(*stbr) * nstbr; -+ -+ return err; -+} -+ -+static ssize_t au_fhsm_read(struct file *file, char __user *buf, size_t count, -+ loff_t *pos) -+{ -+ ssize_t err; -+ int readable; -+ aufs_bindex_t nfhsm, bindex, bbot; -+ struct au_sbinfo *sbinfo; -+ struct au_fhsm *fhsm; -+ struct au_branch *br; -+ struct super_block *sb; -+ -+ err = 0; -+ sbinfo = file->private_data; -+ fhsm = &sbinfo->si_fhsm; -+need_data: -+ spin_lock_irq(&fhsm->fhsm_wqh.lock); -+ if (!atomic_read(&fhsm->fhsm_readable)) { -+ if (vfsub_file_flags(file) & O_NONBLOCK) -+ err = -EAGAIN; -+ else -+ err = wait_event_interruptible_locked_irq -+ (fhsm->fhsm_wqh, -+ atomic_read(&fhsm->fhsm_readable)); -+ } -+ spin_unlock_irq(&fhsm->fhsm_wqh.lock); -+ if (unlikely(err)) -+ goto out; -+ -+ /* sb may already be dead */ -+ au_rw_read_lock(&sbinfo->si_rwsem); -+ readable = atomic_read(&fhsm->fhsm_readable); -+ if (readable > 0) { -+ sb = sbinfo->si_sb; -+ AuDebugOn(!sb); -+ /* exclude the bottom branch */ -+ nfhsm = 0; -+ bbot = au_fhsm_bottom(sb); -+ for (bindex = 0; bindex < bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ if (au_br_fhsm(br->br_perm)) -+ nfhsm++; -+ } -+ err = -EMSGSIZE; -+ if (nfhsm * sizeof(struct aufs_stbr) <= count) { -+ atomic_set(&fhsm->fhsm_readable, 0); -+ err = au_fhsm_do_read(sbinfo->si_sb, (void __user *)buf, -+ count); -+ } -+ } -+ au_rw_read_unlock(&sbinfo->si_rwsem); -+ if (!readable) -+ goto need_data; -+ -+out: -+ return err; -+} -+ -+static int au_fhsm_release(struct inode *inode, struct file *file) -+{ -+ struct au_sbinfo *sbinfo; -+ struct au_fhsm *fhsm; -+ -+ /* sb may already be dead */ -+ sbinfo = file->private_data; -+ fhsm = &sbinfo->si_fhsm; -+ spin_lock(&fhsm->fhsm_spin); -+ fhsm->fhsm_pid = 0; -+ spin_unlock(&fhsm->fhsm_spin); -+ kobject_put(&sbinfo->si_kobj); -+ -+ return 0; -+} -+ -+static const struct file_operations au_fhsm_fops = { -+ .owner = THIS_MODULE, -+ .llseek = noop_llseek, -+ .read = au_fhsm_read, -+ .poll = au_fhsm_poll, -+ .release = au_fhsm_release -+}; -+ -+int au_fhsm_fd(struct super_block *sb, int oflags) -+{ -+ int err, fd; -+ struct au_sbinfo *sbinfo; -+ struct au_fhsm *fhsm; -+ -+ err = -EPERM; -+ if (unlikely(!capable(CAP_SYS_ADMIN))) -+ goto out; -+ -+ err = -EINVAL; -+ if (unlikely(oflags & ~(O_CLOEXEC | O_NONBLOCK))) -+ goto out; -+ -+ err = 0; -+ sbinfo = au_sbi(sb); -+ fhsm = &sbinfo->si_fhsm; -+ spin_lock(&fhsm->fhsm_spin); -+ if (!fhsm->fhsm_pid) -+ fhsm->fhsm_pid = current->pid; -+ else -+ err = -EBUSY; -+ spin_unlock(&fhsm->fhsm_spin); -+ if (unlikely(err)) -+ goto out; -+ -+ oflags |= O_RDONLY; -+ /* oflags |= FMODE_NONOTIFY; */ -+ fd = anon_inode_getfd("[aufs_fhsm]", &au_fhsm_fops, sbinfo, oflags); -+ err = fd; -+ if (unlikely(fd < 0)) -+ goto out_pid; -+ -+ /* succeed regardless 'fhsm' status */ -+ kobject_get(&sbinfo->si_kobj); -+ si_noflush_read_lock(sb); -+ if (au_ftest_si(sbinfo, FHSM)) -+ au_fhsm_wrote_all(sb, /*force*/0); -+ si_read_unlock(sb); -+ goto out; /* success */ -+ -+out_pid: -+ spin_lock(&fhsm->fhsm_spin); -+ fhsm->fhsm_pid = 0; -+ spin_unlock(&fhsm->fhsm_spin); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int au_fhsm_br_alloc(struct au_branch *br) -+{ -+ int err; -+ -+ err = 0; -+ br->br_fhsm = kmalloc(sizeof(*br->br_fhsm), GFP_NOFS); -+ if (br->br_fhsm) -+ au_br_fhsm_init(br->br_fhsm); -+ else -+ err = -ENOMEM; -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+void au_fhsm_fin(struct super_block *sb) -+{ -+ au_fhsm_notify(sb, /*val*/-1); -+} -+ -+void au_fhsm_init(struct au_sbinfo *sbinfo) -+{ -+ struct au_fhsm *fhsm; -+ -+ fhsm = &sbinfo->si_fhsm; -+ spin_lock_init(&fhsm->fhsm_spin); -+ init_waitqueue_head(&fhsm->fhsm_wqh); -+ atomic_set(&fhsm->fhsm_readable, 0); -+ fhsm->fhsm_expire -+ = msecs_to_jiffies(AUFS_FHSM_CACHE_DEF_SEC * MSEC_PER_SEC); -+ fhsm->fhsm_bottom = -1; -+} -+ -+void au_fhsm_set(struct au_sbinfo *sbinfo, unsigned int sec) -+{ -+ sbinfo->si_fhsm.fhsm_expire -+ = msecs_to_jiffies(sec * MSEC_PER_SEC); -+} -+ -+void au_fhsm_show(struct seq_file *seq, struct au_sbinfo *sbinfo) -+{ -+ unsigned int u; -+ -+ if (!au_ftest_si(sbinfo, FHSM)) -+ return; -+ -+ u = jiffies_to_msecs(sbinfo->si_fhsm.fhsm_expire) / MSEC_PER_SEC; -+ if (u != AUFS_FHSM_CACHE_DEF_SEC) -+ seq_printf(seq, ",fhsm_sec=%u", u); -+} -diff --git a/fs/aufs/file.c b/fs/aufs/file.c -new file mode 100644 -index 000000000000..dbb33855d226 ---- /dev/null -+++ b/fs/aufs/file.c -@@ -0,0 +1,863 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * handling file/dir, and address_space operation -+ */ -+ -+#ifdef CONFIG_AUFS_DEBUG -+#include <linux/migrate.h> -+#endif -+#include <linux/pagemap.h> -+#include "aufs.h" -+ -+/* drop flags for writing */ -+unsigned int au_file_roflags(unsigned int flags) -+{ -+ flags &= ~(O_WRONLY | O_RDWR | O_APPEND | O_CREAT | O_TRUNC); -+ flags |= O_RDONLY | O_NOATIME; -+ return flags; -+} -+ -+/* common functions to regular file and dir */ -+struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags, -+ struct file *file, int force_wr) -+{ -+ struct file *h_file; -+ struct dentry *h_dentry; -+ struct inode *h_inode; -+ struct super_block *sb; -+ struct au_branch *br; -+ struct path h_path; -+ int err; -+ -+ /* a race condition can happen between open and unlink/rmdir */ -+ h_file = ERR_PTR(-ENOENT); -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (au_test_nfsd() && (!h_dentry || d_is_negative(h_dentry))) -+ goto out; -+ h_inode = d_inode(h_dentry); -+ spin_lock(&h_dentry->d_lock); -+ err = (!d_unhashed(dentry) && d_unlinked(h_dentry)) -+ /* || !d_inode(dentry)->i_nlink */ -+ ; -+ spin_unlock(&h_dentry->d_lock); -+ if (unlikely(err)) -+ goto out; -+ -+ sb = dentry->d_sb; -+ br = au_sbr(sb, bindex); -+ err = au_br_test_oflag(flags, br); -+ h_file = ERR_PTR(err); -+ if (unlikely(err)) -+ goto out; -+ -+ /* drop flags for writing */ -+ if (au_test_ro(sb, bindex, d_inode(dentry))) { -+ if (force_wr && !(flags & O_WRONLY)) -+ force_wr = 0; -+ flags = au_file_roflags(flags); -+ if (force_wr) { -+ h_file = ERR_PTR(-EROFS); -+ flags = au_file_roflags(flags); -+ if (unlikely(vfsub_native_ro(h_inode) -+ || IS_APPEND(h_inode))) -+ goto out; -+ flags &= ~O_ACCMODE; -+ flags |= O_WRONLY; -+ } -+ } -+ flags &= ~O_CREAT; -+ au_lcnt_inc(&br->br_nfiles); -+ h_path.dentry = h_dentry; -+ h_path.mnt = au_br_mnt(br); -+ h_file = vfsub_dentry_open(&h_path, flags); -+ if (IS_ERR(h_file)) -+ goto out_br; -+ -+ if (flags & __FMODE_EXEC) { -+ err = deny_write_access(h_file); -+ if (unlikely(err)) { -+ fput(h_file); -+ h_file = ERR_PTR(err); -+ goto out_br; -+ } -+ } -+ fsnotify_open(h_file); -+ goto out; /* success */ -+ -+out_br: -+ au_lcnt_dec(&br->br_nfiles); -+out: -+ return h_file; -+} -+ -+static int au_cmoo(struct dentry *dentry) -+{ -+ int err, cmoo, matched; -+ unsigned int udba; -+ struct path h_path; -+ struct au_pin pin; -+ struct au_cp_generic cpg = { -+ .dentry = dentry, -+ .bdst = -1, -+ .bsrc = -1, -+ .len = -1, -+ .pin = &pin, -+ .flags = AuCpup_DTIME | AuCpup_HOPEN -+ }; -+ struct inode *delegated; -+ struct super_block *sb; -+ struct au_sbinfo *sbinfo; -+ struct au_fhsm *fhsm; -+ pid_t pid; -+ struct au_branch *br; -+ struct dentry *parent; -+ struct au_hinode *hdir; -+ -+ DiMustWriteLock(dentry); -+ IiMustWriteLock(d_inode(dentry)); -+ -+ err = 0; -+ if (IS_ROOT(dentry)) -+ goto out; -+ cpg.bsrc = au_dbtop(dentry); -+ if (!cpg.bsrc) -+ goto out; -+ -+ sb = dentry->d_sb; -+ sbinfo = au_sbi(sb); -+ fhsm = &sbinfo->si_fhsm; -+ pid = au_fhsm_pid(fhsm); -+ rcu_read_lock(); -+ matched = (pid -+ && (current->pid == pid -+ || rcu_dereference(current->real_parent)->pid == pid)); -+ rcu_read_unlock(); -+ if (matched) -+ goto out; -+ -+ br = au_sbr(sb, cpg.bsrc); -+ cmoo = au_br_cmoo(br->br_perm); -+ if (!cmoo) -+ goto out; -+ if (!d_is_reg(dentry)) -+ cmoo &= AuBrAttr_COO_ALL; -+ if (!cmoo) -+ goto out; -+ -+ parent = dget_parent(dentry); -+ di_write_lock_parent(parent); -+ err = au_wbr_do_copyup_bu(dentry, cpg.bsrc - 1); -+ cpg.bdst = err; -+ if (unlikely(err < 0)) { -+ err = 0; /* there is no upper writable branch */ -+ goto out_dgrade; -+ } -+ AuDbg("bsrc %d, bdst %d\n", cpg.bsrc, cpg.bdst); -+ -+ /* do not respect the coo attrib for the target branch */ -+ err = au_cpup_dirs(dentry, cpg.bdst); -+ if (unlikely(err)) -+ goto out_dgrade; -+ -+ di_downgrade_lock(parent, AuLock_IR); -+ udba = au_opt_udba(sb); -+ err = au_pin(&pin, dentry, cpg.bdst, udba, -+ AuPin_DI_LOCKED | AuPin_MNT_WRITE); -+ if (unlikely(err)) -+ goto out_parent; -+ -+ err = au_sio_cpup_simple(&cpg); -+ au_unpin(&pin); -+ if (unlikely(err)) -+ goto out_parent; -+ if (!(cmoo & AuBrWAttr_MOO)) -+ goto out_parent; /* success */ -+ -+ err = au_pin(&pin, dentry, cpg.bsrc, udba, -+ AuPin_DI_LOCKED | AuPin_MNT_WRITE); -+ if (unlikely(err)) -+ goto out_parent; -+ -+ h_path.mnt = au_br_mnt(br); -+ h_path.dentry = au_h_dptr(dentry, cpg.bsrc); -+ hdir = au_hi(d_inode(parent), cpg.bsrc); -+ delegated = NULL; -+ err = vfsub_unlink(hdir->hi_inode, &h_path, &delegated, /*force*/1); -+ au_unpin(&pin); -+ /* todo: keep h_dentry or not? */ -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal unlink\n"); -+ iput(delegated); -+ } -+ if (unlikely(err)) { -+ pr_err("unlink %pd after coo failed (%d), ignored\n", -+ dentry, err); -+ err = 0; -+ } -+ goto out_parent; /* success */ -+ -+out_dgrade: -+ di_downgrade_lock(parent, AuLock_IR); -+out_parent: -+ di_read_unlock(parent, AuLock_IR); -+ dput(parent); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+int au_do_open(struct file *file, struct au_do_open_args *args) -+{ -+ int err, aopen = args->aopen; -+ struct dentry *dentry; -+ struct au_finfo *finfo; -+ -+ if (!aopen) -+ err = au_finfo_init(file, args->fidir); -+ else { -+ lockdep_off(); -+ err = au_finfo_init(file, args->fidir); -+ lockdep_on(); -+ } -+ if (unlikely(err)) -+ goto out; -+ -+ dentry = file->f_path.dentry; -+ AuDebugOn(IS_ERR_OR_NULL(dentry)); -+ di_write_lock_child(dentry); -+ err = au_cmoo(dentry); -+ di_downgrade_lock(dentry, AuLock_IR); -+ if (!err) { -+ if (!aopen) -+ err = args->open(file, vfsub_file_flags(file), NULL); -+ else { -+ lockdep_off(); -+ err = args->open(file, vfsub_file_flags(file), -+ args->h_file); -+ lockdep_on(); -+ } -+ } -+ di_read_unlock(dentry, AuLock_IR); -+ -+ finfo = au_fi(file); -+ if (!err) { -+ finfo->fi_file = file; -+ au_hbl_add(&finfo->fi_hlist, -+ &au_sbi(file->f_path.dentry->d_sb)->si_files); -+ } -+ if (!aopen) -+ fi_write_unlock(file); -+ else { -+ lockdep_off(); -+ fi_write_unlock(file); -+ lockdep_on(); -+ } -+ if (unlikely(err)) { -+ finfo->fi_hdir = NULL; -+ au_finfo_fin(file); -+ } -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+int au_reopen_nondir(struct file *file) -+{ -+ int err; -+ aufs_bindex_t btop; -+ struct dentry *dentry; -+ struct au_branch *br; -+ struct file *h_file, *h_file_tmp; -+ -+ dentry = file->f_path.dentry; -+ btop = au_dbtop(dentry); -+ br = au_sbr(dentry->d_sb, btop); -+ h_file_tmp = NULL; -+ if (au_fbtop(file) == btop) { -+ h_file = au_hf_top(file); -+ if (file->f_mode == h_file->f_mode) -+ return 0; /* success */ -+ h_file_tmp = h_file; -+ get_file(h_file_tmp); -+ au_lcnt_inc(&br->br_nfiles); -+ au_set_h_fptr(file, btop, NULL); -+ } -+ AuDebugOn(au_fi(file)->fi_hdir); -+ /* -+ * it can happen -+ * file exists on both of rw and ro -+ * open --> dbtop and fbtop are both 0 -+ * prepend a branch as rw, "rw" become ro -+ * remove rw/file -+ * delete the top branch, "rw" becomes rw again -+ * --> dbtop is 1, fbtop is still 0 -+ * write --> fbtop is 0 but dbtop is 1 -+ */ -+ /* AuDebugOn(au_fbtop(file) < btop); */ -+ -+ h_file = au_h_open(dentry, btop, vfsub_file_flags(file) & ~O_TRUNC, -+ file, /*force_wr*/0); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) { -+ if (h_file_tmp) { -+ /* revert */ -+ au_set_h_fptr(file, btop, h_file_tmp); -+ h_file_tmp = NULL; -+ } -+ goto out; /* todo: close all? */ -+ } -+ -+ err = 0; -+ au_set_fbtop(file, btop); -+ au_set_h_fptr(file, btop, h_file); -+ au_update_figen(file); -+ /* todo: necessary? */ -+ /* file->f_ra = h_file->f_ra; */ -+ -+out: -+ if (h_file_tmp) { -+ fput(h_file_tmp); -+ au_lcnt_dec(&br->br_nfiles); -+ } -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_reopen_wh(struct file *file, aufs_bindex_t btgt, -+ struct dentry *hi_wh) -+{ -+ int err; -+ aufs_bindex_t btop; -+ struct au_dinfo *dinfo; -+ struct dentry *h_dentry; -+ struct au_hdentry *hdp; -+ -+ dinfo = au_di(file->f_path.dentry); -+ AuRwMustWriteLock(&dinfo->di_rwsem); -+ -+ btop = dinfo->di_btop; -+ dinfo->di_btop = btgt; -+ hdp = au_hdentry(dinfo, btgt); -+ h_dentry = hdp->hd_dentry; -+ hdp->hd_dentry = hi_wh; -+ err = au_reopen_nondir(file); -+ hdp->hd_dentry = h_dentry; -+ dinfo->di_btop = btop; -+ -+ return err; -+} -+ -+static int au_ready_to_write_wh(struct file *file, loff_t len, -+ aufs_bindex_t bcpup, struct au_pin *pin) -+{ -+ int err; -+ struct inode *inode, *h_inode; -+ struct dentry *h_dentry, *hi_wh; -+ struct au_cp_generic cpg = { -+ .dentry = file->f_path.dentry, -+ .bdst = bcpup, -+ .bsrc = -1, -+ .len = len, -+ .pin = pin -+ }; -+ -+ au_update_dbtop(cpg.dentry); -+ inode = d_inode(cpg.dentry); -+ h_inode = NULL; -+ if (au_dbtop(cpg.dentry) <= bcpup -+ && au_dbbot(cpg.dentry) >= bcpup) { -+ h_dentry = au_h_dptr(cpg.dentry, bcpup); -+ if (h_dentry && d_is_positive(h_dentry)) -+ h_inode = d_inode(h_dentry); -+ } -+ hi_wh = au_hi_wh(inode, bcpup); -+ if (!hi_wh && !h_inode) -+ err = au_sio_cpup_wh(&cpg, file); -+ else -+ /* already copied-up after unlink */ -+ err = au_reopen_wh(file, bcpup, hi_wh); -+ -+ if (!err -+ && (inode->i_nlink > 1 -+ || (inode->i_state & I_LINKABLE)) -+ && au_opt_test(au_mntflags(cpg.dentry->d_sb), PLINK)) -+ au_plink_append(inode, bcpup, au_h_dptr(cpg.dentry, bcpup)); -+ -+ return err; -+} -+ -+/* -+ * prepare the @file for writing. -+ */ -+int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin) -+{ -+ int err; -+ aufs_bindex_t dbtop; -+ struct dentry *parent; -+ struct inode *inode; -+ struct super_block *sb; -+ struct file *h_file; -+ struct au_cp_generic cpg = { -+ .dentry = file->f_path.dentry, -+ .bdst = -1, -+ .bsrc = -1, -+ .len = len, -+ .pin = pin, -+ .flags = AuCpup_DTIME -+ }; -+ -+ sb = cpg.dentry->d_sb; -+ inode = d_inode(cpg.dentry); -+ cpg.bsrc = au_fbtop(file); -+ err = au_test_ro(sb, cpg.bsrc, inode); -+ if (!err && (au_hf_top(file)->f_mode & FMODE_WRITE)) { -+ err = au_pin(pin, cpg.dentry, cpg.bsrc, AuOpt_UDBA_NONE, -+ /*flags*/0); -+ goto out; -+ } -+ -+ /* need to cpup or reopen */ -+ parent = dget_parent(cpg.dentry); -+ di_write_lock_parent(parent); -+ err = AuWbrCopyup(au_sbi(sb), cpg.dentry); -+ cpg.bdst = err; -+ if (unlikely(err < 0)) -+ goto out_dgrade; -+ err = 0; -+ -+ if (!d_unhashed(cpg.dentry) && !au_h_dptr(parent, cpg.bdst)) { -+ err = au_cpup_dirs(cpg.dentry, cpg.bdst); -+ if (unlikely(err)) -+ goto out_dgrade; -+ } -+ -+ err = au_pin(pin, cpg.dentry, cpg.bdst, AuOpt_UDBA_NONE, -+ AuPin_DI_LOCKED | AuPin_MNT_WRITE); -+ if (unlikely(err)) -+ goto out_dgrade; -+ -+ dbtop = au_dbtop(cpg.dentry); -+ if (dbtop <= cpg.bdst) -+ cpg.bsrc = cpg.bdst; -+ -+ if (dbtop <= cpg.bdst /* just reopen */ -+ || !d_unhashed(cpg.dentry) /* copyup and reopen */ -+ ) { -+ h_file = au_h_open_pre(cpg.dentry, cpg.bsrc, /*force_wr*/0); -+ if (IS_ERR(h_file)) -+ err = PTR_ERR(h_file); -+ else { -+ di_downgrade_lock(parent, AuLock_IR); -+ if (dbtop > cpg.bdst) -+ err = au_sio_cpup_simple(&cpg); -+ if (!err) -+ err = au_reopen_nondir(file); -+ au_h_open_post(cpg.dentry, cpg.bsrc, h_file); -+ } -+ } else { /* copyup as wh and reopen */ -+ /* -+ * since writable hfsplus branch is not supported, -+ * h_open_pre/post() are unnecessary. -+ */ -+ err = au_ready_to_write_wh(file, len, cpg.bdst, pin); -+ di_downgrade_lock(parent, AuLock_IR); -+ } -+ -+ if (!err) { -+ au_pin_set_parent_lflag(pin, /*lflag*/0); -+ goto out_dput; /* success */ -+ } -+ au_unpin(pin); -+ goto out_unlock; -+ -+out_dgrade: -+ di_downgrade_lock(parent, AuLock_IR); -+out_unlock: -+ di_read_unlock(parent, AuLock_IR); -+out_dput: -+ dput(parent); -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int au_do_flush(struct file *file, fl_owner_t id, -+ int (*flush)(struct file *file, fl_owner_t id)) -+{ -+ int err; -+ struct super_block *sb; -+ struct inode *inode; -+ -+ inode = file_inode(file); -+ sb = inode->i_sb; -+ si_noflush_read_lock(sb); -+ fi_read_lock(file); -+ ii_read_lock_child(inode); -+ -+ err = flush(file, id); -+ au_cpup_attr_timesizes(inode); -+ -+ ii_read_unlock(inode); -+ fi_read_unlock(file); -+ si_read_unlock(sb); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_file_refresh_by_inode(struct file *file, int *need_reopen) -+{ -+ int err; -+ struct au_pin pin; -+ struct au_finfo *finfo; -+ struct dentry *parent, *hi_wh; -+ struct inode *inode; -+ struct super_block *sb; -+ struct au_cp_generic cpg = { -+ .dentry = file->f_path.dentry, -+ .bdst = -1, -+ .bsrc = -1, -+ .len = -1, -+ .pin = &pin, -+ .flags = AuCpup_DTIME -+ }; -+ -+ FiMustWriteLock(file); -+ -+ err = 0; -+ finfo = au_fi(file); -+ sb = cpg.dentry->d_sb; -+ inode = d_inode(cpg.dentry); -+ cpg.bdst = au_ibtop(inode); -+ if (cpg.bdst == finfo->fi_btop || IS_ROOT(cpg.dentry)) -+ goto out; -+ -+ parent = dget_parent(cpg.dentry); -+ if (au_test_ro(sb, cpg.bdst, inode)) { -+ di_read_lock_parent(parent, !AuLock_IR); -+ err = AuWbrCopyup(au_sbi(sb), cpg.dentry); -+ cpg.bdst = err; -+ di_read_unlock(parent, !AuLock_IR); -+ if (unlikely(err < 0)) -+ goto out_parent; -+ err = 0; -+ } -+ -+ di_read_lock_parent(parent, AuLock_IR); -+ hi_wh = au_hi_wh(inode, cpg.bdst); -+ if (!S_ISDIR(inode->i_mode) -+ && au_opt_test(au_mntflags(sb), PLINK) -+ && au_plink_test(inode) -+ && !d_unhashed(cpg.dentry) -+ && cpg.bdst < au_dbtop(cpg.dentry)) { -+ err = au_test_and_cpup_dirs(cpg.dentry, cpg.bdst); -+ if (unlikely(err)) -+ goto out_unlock; -+ -+ /* always superio. */ -+ err = au_pin(&pin, cpg.dentry, cpg.bdst, AuOpt_UDBA_NONE, -+ AuPin_DI_LOCKED | AuPin_MNT_WRITE); -+ if (!err) { -+ err = au_sio_cpup_simple(&cpg); -+ au_unpin(&pin); -+ } -+ } else if (hi_wh) { -+ /* already copied-up after unlink */ -+ err = au_reopen_wh(file, cpg.bdst, hi_wh); -+ *need_reopen = 0; -+ } -+ -+out_unlock: -+ di_read_unlock(parent, AuLock_IR); -+out_parent: -+ dput(parent); -+out: -+ return err; -+} -+ -+static void au_do_refresh_dir(struct file *file) -+{ -+ aufs_bindex_t bindex, bbot, new_bindex, brid; -+ struct au_hfile *p, tmp, *q; -+ struct au_finfo *finfo; -+ struct super_block *sb; -+ struct au_fidir *fidir; -+ -+ FiMustWriteLock(file); -+ -+ sb = file->f_path.dentry->d_sb; -+ finfo = au_fi(file); -+ fidir = finfo->fi_hdir; -+ AuDebugOn(!fidir); -+ p = fidir->fd_hfile + finfo->fi_btop; -+ brid = p->hf_br->br_id; -+ bbot = fidir->fd_bbot; -+ for (bindex = finfo->fi_btop; bindex <= bbot; bindex++, p++) { -+ if (!p->hf_file) -+ continue; -+ -+ new_bindex = au_br_index(sb, p->hf_br->br_id); -+ if (new_bindex == bindex) -+ continue; -+ if (new_bindex < 0) { -+ au_set_h_fptr(file, bindex, NULL); -+ continue; -+ } -+ -+ /* swap two lower inode, and loop again */ -+ q = fidir->fd_hfile + new_bindex; -+ tmp = *q; -+ *q = *p; -+ *p = tmp; -+ if (tmp.hf_file) { -+ bindex--; -+ p--; -+ } -+ } -+ -+ p = fidir->fd_hfile; -+ if (!au_test_mmapped(file) && !d_unlinked(file->f_path.dentry)) { -+ bbot = au_sbbot(sb); -+ for (finfo->fi_btop = 0; finfo->fi_btop <= bbot; -+ finfo->fi_btop++, p++) -+ if (p->hf_file) { -+ if (file_inode(p->hf_file)) -+ break; -+ au_hfput(p, /*execed*/0); -+ } -+ } else { -+ bbot = au_br_index(sb, brid); -+ for (finfo->fi_btop = 0; finfo->fi_btop < bbot; -+ finfo->fi_btop++, p++) -+ if (p->hf_file) -+ au_hfput(p, /*execed*/0); -+ bbot = au_sbbot(sb); -+ } -+ -+ p = fidir->fd_hfile + bbot; -+ for (fidir->fd_bbot = bbot; fidir->fd_bbot >= finfo->fi_btop; -+ fidir->fd_bbot--, p--) -+ if (p->hf_file) { -+ if (file_inode(p->hf_file)) -+ break; -+ au_hfput(p, /*execed*/0); -+ } -+ AuDebugOn(fidir->fd_bbot < finfo->fi_btop); -+} -+ -+/* -+ * after branch manipulating, refresh the file. -+ */ -+static int refresh_file(struct file *file, int (*reopen)(struct file *file)) -+{ -+ int err, need_reopen, nbr; -+ aufs_bindex_t bbot, bindex; -+ struct dentry *dentry; -+ struct super_block *sb; -+ struct au_finfo *finfo; -+ struct au_hfile *hfile; -+ -+ dentry = file->f_path.dentry; -+ sb = dentry->d_sb; -+ nbr = au_sbbot(sb) + 1; -+ finfo = au_fi(file); -+ if (!finfo->fi_hdir) { -+ hfile = &finfo->fi_htop; -+ AuDebugOn(!hfile->hf_file); -+ bindex = au_br_index(sb, hfile->hf_br->br_id); -+ AuDebugOn(bindex < 0); -+ if (bindex != finfo->fi_btop) -+ au_set_fbtop(file, bindex); -+ } else { -+ err = au_fidir_realloc(finfo, nbr, /*may_shrink*/0); -+ if (unlikely(err)) -+ goto out; -+ au_do_refresh_dir(file); -+ } -+ -+ err = 0; -+ need_reopen = 1; -+ if (!au_test_mmapped(file)) -+ err = au_file_refresh_by_inode(file, &need_reopen); -+ if (finfo->fi_hdir) -+ /* harmless if err */ -+ au_fidir_realloc(finfo, nbr, /*may_shrink*/1); -+ if (!err && need_reopen && !d_unlinked(dentry)) -+ err = reopen(file); -+ if (!err) { -+ au_update_figen(file); -+ goto out; /* success */ -+ } -+ -+ /* error, close all lower files */ -+ if (finfo->fi_hdir) { -+ bbot = au_fbbot_dir(file); -+ for (bindex = au_fbtop(file); bindex <= bbot; bindex++) -+ au_set_h_fptr(file, bindex, NULL); -+ } -+ -+out: -+ return err; -+} -+ -+/* common function to regular file and dir */ -+int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file), -+ int wlock, unsigned int fi_lsc) -+{ -+ int err; -+ unsigned int sigen, figen; -+ aufs_bindex_t btop; -+ unsigned char pseudo_link; -+ struct dentry *dentry; -+ struct inode *inode; -+ -+ err = 0; -+ dentry = file->f_path.dentry; -+ inode = d_inode(dentry); -+ sigen = au_sigen(dentry->d_sb); -+ fi_write_lock_nested(file, fi_lsc); -+ figen = au_figen(file); -+ if (!fi_lsc) -+ di_write_lock_child(dentry); -+ else -+ di_write_lock_child2(dentry); -+ btop = au_dbtop(dentry); -+ pseudo_link = (btop != au_ibtop(inode)); -+ if (sigen == figen && !pseudo_link && au_fbtop(file) == btop) { -+ if (!wlock) { -+ di_downgrade_lock(dentry, AuLock_IR); -+ fi_downgrade_lock(file); -+ } -+ goto out; /* success */ -+ } -+ -+ AuDbg("sigen %d, figen %d\n", sigen, figen); -+ if (au_digen_test(dentry, sigen)) { -+ err = au_reval_dpath(dentry, sigen); -+ AuDebugOn(!err && au_digen_test(dentry, sigen)); -+ } -+ -+ if (!err) -+ err = refresh_file(file, reopen); -+ if (!err) { -+ if (!wlock) { -+ di_downgrade_lock(dentry, AuLock_IR); -+ fi_downgrade_lock(file); -+ } -+ } else { -+ di_write_unlock(dentry); -+ fi_write_unlock(file); -+ } -+ -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* cf. aufs_nopage() */ -+/* for madvise(2) */ -+static int aufs_readpage(struct file *file __maybe_unused, struct page *page) -+{ -+ unlock_page(page); -+ return 0; -+} -+ -+/* it will never be called, but necessary to support O_DIRECT */ -+static ssize_t aufs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) -+{ BUG(); return 0; } -+ -+/* they will never be called. */ -+#ifdef CONFIG_AUFS_DEBUG -+static int aufs_write_begin(struct file *file, struct address_space *mapping, -+ loff_t pos, unsigned len, unsigned flags, -+ struct page **pagep, void **fsdata) -+{ AuUnsupport(); return 0; } -+static int aufs_write_end(struct file *file, struct address_space *mapping, -+ loff_t pos, unsigned len, unsigned copied, -+ struct page *page, void *fsdata) -+{ AuUnsupport(); return 0; } -+static int aufs_writepage(struct page *page, struct writeback_control *wbc) -+{ AuUnsupport(); return 0; } -+ -+static int aufs_set_page_dirty(struct page *page) -+{ AuUnsupport(); return 0; } -+static void aufs_invalidatepage(struct page *page, unsigned int offset, -+ unsigned int length) -+{ AuUnsupport(); } -+static int aufs_releasepage(struct page *page, gfp_t gfp) -+{ AuUnsupport(); return 0; } -+#if 0 /* called by memory compaction regardless file */ -+static int aufs_migratepage(struct address_space *mapping, struct page *newpage, -+ struct page *page, enum migrate_mode mode) -+{ AuUnsupport(); return 0; } -+#endif -+static bool aufs_isolate_page(struct page *page, isolate_mode_t mode) -+{ AuUnsupport(); return true; } -+static void aufs_putback_page(struct page *page) -+{ AuUnsupport(); } -+static int aufs_launder_page(struct page *page) -+{ AuUnsupport(); return 0; } -+static int aufs_is_partially_uptodate(struct page *page, -+ unsigned long from, -+ unsigned long count) -+{ AuUnsupport(); return 0; } -+static void aufs_is_dirty_writeback(struct page *page, bool *dirty, -+ bool *writeback) -+{ AuUnsupport(); } -+static int aufs_error_remove_page(struct address_space *mapping, -+ struct page *page) -+{ AuUnsupport(); return 0; } -+static int aufs_swap_activate(struct swap_info_struct *sis, struct file *file, -+ sector_t *span) -+{ AuUnsupport(); return 0; } -+static void aufs_swap_deactivate(struct file *file) -+{ AuUnsupport(); } -+#endif /* CONFIG_AUFS_DEBUG */ -+ -+const struct address_space_operations aufs_aop = { -+ .readpage = aufs_readpage, -+ .direct_IO = aufs_direct_IO, -+#ifdef CONFIG_AUFS_DEBUG -+ .writepage = aufs_writepage, -+ /* no writepages, because of writepage */ -+ .set_page_dirty = aufs_set_page_dirty, -+ /* no readpages, because of readpage */ -+ .write_begin = aufs_write_begin, -+ .write_end = aufs_write_end, -+ /* no bmap, no block device */ -+ .invalidatepage = aufs_invalidatepage, -+ .releasepage = aufs_releasepage, -+ /* is fallback_migrate_page ok? */ -+ /* .migratepage = aufs_migratepage, */ -+ .isolate_page = aufs_isolate_page, -+ .putback_page = aufs_putback_page, -+ .launder_page = aufs_launder_page, -+ .is_partially_uptodate = aufs_is_partially_uptodate, -+ .is_dirty_writeback = aufs_is_dirty_writeback, -+ .error_remove_page = aufs_error_remove_page, -+ .swap_activate = aufs_swap_activate, -+ .swap_deactivate = aufs_swap_deactivate -+#endif /* CONFIG_AUFS_DEBUG */ -+}; -diff --git a/fs/aufs/file.h b/fs/aufs/file.h -new file mode 100644 -index 000000000000..c679a19df528 ---- /dev/null -+++ b/fs/aufs/file.h -@@ -0,0 +1,342 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * file operations -+ */ -+ -+#ifndef __AUFS_FILE_H__ -+#define __AUFS_FILE_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/file.h> -+#include <linux/fs.h> -+#include <linux/mm_types.h> -+#include <linux/poll.h> -+#include "rwsem.h" -+ -+struct au_branch; -+struct au_hfile { -+ struct file *hf_file; -+ struct au_branch *hf_br; -+}; -+ -+struct au_vdir; -+struct au_fidir { -+ aufs_bindex_t fd_bbot; -+ aufs_bindex_t fd_nent; -+ struct au_vdir *fd_vdir_cache; -+ struct au_hfile fd_hfile[]; -+}; -+ -+static inline int au_fidir_sz(int nent) -+{ -+ AuDebugOn(nent < 0); -+ return sizeof(struct au_fidir) + sizeof(struct au_hfile) * nent; -+} -+ -+struct au_finfo { -+ atomic_t fi_generation; -+ -+ struct au_rwsem fi_rwsem; -+ aufs_bindex_t fi_btop; -+ -+ /* do not union them */ -+ struct { /* for non-dir */ -+ struct au_hfile fi_htop; -+ atomic_t fi_mmapped; -+ }; -+ struct au_fidir *fi_hdir; /* for dir only */ -+ -+ struct hlist_bl_node fi_hlist; -+ struct file *fi_file; /* very ugly */ -+ struct rcu_head rcu; -+} ____cacheline_aligned_in_smp; -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* file.c */ -+extern const struct address_space_operations aufs_aop; -+unsigned int au_file_roflags(unsigned int flags); -+struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags, -+ struct file *file, int force_wr); -+struct au_do_open_args { -+ int aopen; -+ int (*open)(struct file *file, int flags, -+ struct file *h_file); -+ struct au_fidir *fidir; -+ struct file *h_file; -+}; -+int au_do_open(struct file *file, struct au_do_open_args *args); -+int au_reopen_nondir(struct file *file); -+struct au_pin; -+int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin); -+int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file), -+ int wlock, unsigned int fi_lsc); -+int au_do_flush(struct file *file, fl_owner_t id, -+ int (*flush)(struct file *file, fl_owner_t id)); -+ -+/* poll.c */ -+#ifdef CONFIG_AUFS_POLL -+__poll_t aufs_poll(struct file *file, struct poll_table_struct *pt); -+#endif -+ -+#ifdef CONFIG_AUFS_BR_HFSPLUS -+/* hfsplus.c */ -+struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex, -+ int force_wr); -+void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex, -+ struct file *h_file); -+#else -+AuStub(struct file *, au_h_open_pre, return NULL, struct dentry *dentry, -+ aufs_bindex_t bindex, int force_wr) -+AuStubVoid(au_h_open_post, struct dentry *dentry, aufs_bindex_t bindex, -+ struct file *h_file); -+#endif -+ -+/* f_op.c */ -+extern const struct file_operations aufs_file_fop; -+int au_do_open_nondir(struct file *file, int flags, struct file *h_file); -+int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file); -+struct file *au_read_pre(struct file *file, int keep_fi, unsigned int lsc); -+ -+/* finfo.c */ -+void au_hfput(struct au_hfile *hf, int execed); -+void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, -+ struct file *h_file); -+ -+void au_update_figen(struct file *file); -+struct au_fidir *au_fidir_alloc(struct super_block *sb); -+int au_fidir_realloc(struct au_finfo *finfo, int nbr, int may_shrink); -+ -+void au_fi_init_once(void *_fi); -+void au_finfo_fin(struct file *file); -+int au_finfo_init(struct file *file, struct au_fidir *fidir); -+ -+/* ioctl.c */ -+long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg); -+#ifdef CONFIG_COMPAT -+long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd, -+ unsigned long arg); -+long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd, -+ unsigned long arg); -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline struct au_finfo *au_fi(struct file *file) -+{ -+ return file->private_data; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+#define fi_read_lock(f) au_rw_read_lock(&au_fi(f)->fi_rwsem) -+#define fi_write_lock(f) au_rw_write_lock(&au_fi(f)->fi_rwsem) -+#define fi_read_trylock(f) au_rw_read_trylock(&au_fi(f)->fi_rwsem) -+#define fi_write_trylock(f) au_rw_write_trylock(&au_fi(f)->fi_rwsem) -+/* -+#define fi_read_trylock_nested(f) \ -+ au_rw_read_trylock_nested(&au_fi(f)->fi_rwsem) -+#define fi_write_trylock_nested(f) \ -+ au_rw_write_trylock_nested(&au_fi(f)->fi_rwsem) -+*/ -+ -+#define fi_read_unlock(f) au_rw_read_unlock(&au_fi(f)->fi_rwsem) -+#define fi_write_unlock(f) au_rw_write_unlock(&au_fi(f)->fi_rwsem) -+#define fi_downgrade_lock(f) au_rw_dgrade_lock(&au_fi(f)->fi_rwsem) -+ -+/* lock subclass for finfo */ -+enum { -+ AuLsc_FI_1, -+ AuLsc_FI_2 -+}; -+ -+static inline void fi_read_lock_nested(struct file *f, unsigned int lsc) -+{ -+ au_rw_read_lock_nested(&au_fi(f)->fi_rwsem, lsc); -+} -+ -+static inline void fi_write_lock_nested(struct file *f, unsigned int lsc) -+{ -+ au_rw_write_lock_nested(&au_fi(f)->fi_rwsem, lsc); -+} -+ -+/* -+ * fi_read_lock_1, fi_write_lock_1, -+ * fi_read_lock_2, fi_write_lock_2 -+ */ -+#define AuReadLockFunc(name) \ -+static inline void fi_read_lock_##name(struct file *f) \ -+{ fi_read_lock_nested(f, AuLsc_FI_##name); } -+ -+#define AuWriteLockFunc(name) \ -+static inline void fi_write_lock_##name(struct file *f) \ -+{ fi_write_lock_nested(f, AuLsc_FI_##name); } -+ -+#define AuRWLockFuncs(name) \ -+ AuReadLockFunc(name) \ -+ AuWriteLockFunc(name) -+ -+AuRWLockFuncs(1); -+AuRWLockFuncs(2); -+ -+#undef AuReadLockFunc -+#undef AuWriteLockFunc -+#undef AuRWLockFuncs -+ -+#define FiMustNoWaiters(f) AuRwMustNoWaiters(&au_fi(f)->fi_rwsem) -+#define FiMustAnyLock(f) AuRwMustAnyLock(&au_fi(f)->fi_rwsem) -+#define FiMustWriteLock(f) AuRwMustWriteLock(&au_fi(f)->fi_rwsem) -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* todo: hard/soft set? */ -+static inline aufs_bindex_t au_fbtop(struct file *file) -+{ -+ FiMustAnyLock(file); -+ return au_fi(file)->fi_btop; -+} -+ -+static inline aufs_bindex_t au_fbbot_dir(struct file *file) -+{ -+ FiMustAnyLock(file); -+ AuDebugOn(!au_fi(file)->fi_hdir); -+ return au_fi(file)->fi_hdir->fd_bbot; -+} -+ -+static inline struct au_vdir *au_fvdir_cache(struct file *file) -+{ -+ FiMustAnyLock(file); -+ AuDebugOn(!au_fi(file)->fi_hdir); -+ return au_fi(file)->fi_hdir->fd_vdir_cache; -+} -+ -+static inline void au_set_fbtop(struct file *file, aufs_bindex_t bindex) -+{ -+ FiMustWriteLock(file); -+ au_fi(file)->fi_btop = bindex; -+} -+ -+static inline void au_set_fbbot_dir(struct file *file, aufs_bindex_t bindex) -+{ -+ FiMustWriteLock(file); -+ AuDebugOn(!au_fi(file)->fi_hdir); -+ au_fi(file)->fi_hdir->fd_bbot = bindex; -+} -+ -+static inline void au_set_fvdir_cache(struct file *file, -+ struct au_vdir *vdir_cache) -+{ -+ FiMustWriteLock(file); -+ AuDebugOn(!au_fi(file)->fi_hdir); -+ au_fi(file)->fi_hdir->fd_vdir_cache = vdir_cache; -+} -+ -+static inline struct file *au_hf_top(struct file *file) -+{ -+ FiMustAnyLock(file); -+ AuDebugOn(au_fi(file)->fi_hdir); -+ return au_fi(file)->fi_htop.hf_file; -+} -+ -+static inline struct file *au_hf_dir(struct file *file, aufs_bindex_t bindex) -+{ -+ FiMustAnyLock(file); -+ AuDebugOn(!au_fi(file)->fi_hdir); -+ return au_fi(file)->fi_hdir->fd_hfile[0 + bindex].hf_file; -+} -+ -+/* todo: memory barrier? */ -+static inline unsigned int au_figen(struct file *f) -+{ -+ return atomic_read(&au_fi(f)->fi_generation); -+} -+ -+static inline void au_set_mmapped(struct file *f) -+{ -+ if (atomic_inc_return(&au_fi(f)->fi_mmapped)) -+ return; -+ pr_warn("fi_mmapped wrapped around\n"); -+ while (!atomic_inc_return(&au_fi(f)->fi_mmapped)) -+ ; -+} -+ -+static inline void au_unset_mmapped(struct file *f) -+{ -+ atomic_dec(&au_fi(f)->fi_mmapped); -+} -+ -+static inline int au_test_mmapped(struct file *f) -+{ -+ return atomic_read(&au_fi(f)->fi_mmapped); -+} -+ -+/* customize vma->vm_file */ -+ -+static inline void au_do_vm_file_reset(struct vm_area_struct *vma, -+ struct file *file) -+{ -+ struct file *f; -+ -+ f = vma->vm_file; -+ get_file(file); -+ vma->vm_file = file; -+ fput(f); -+} -+ -+#ifdef CONFIG_MMU -+#define AuDbgVmRegion(file, vma) do {} while (0) -+ -+static inline void au_vm_file_reset(struct vm_area_struct *vma, -+ struct file *file) -+{ -+ au_do_vm_file_reset(vma, file); -+} -+#else -+#define AuDbgVmRegion(file, vma) \ -+ AuDebugOn((vma)->vm_region && (vma)->vm_region->vm_file != (file)) -+ -+static inline void au_vm_file_reset(struct vm_area_struct *vma, -+ struct file *file) -+{ -+ struct file *f; -+ -+ au_do_vm_file_reset(vma, file); -+ f = vma->vm_region->vm_file; -+ get_file(file); -+ vma->vm_region->vm_file = file; -+ fput(f); -+} -+#endif /* CONFIG_MMU */ -+ -+/* handle vma->vm_prfile */ -+static inline void au_vm_prfile_set(struct vm_area_struct *vma, -+ struct file *file) -+{ -+ get_file(file); -+ vma->vm_prfile = file; -+#ifndef CONFIG_MMU -+ get_file(file); -+ vma->vm_region->vm_prfile = file; -+#endif -+} -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_FILE_H__ */ -diff --git a/fs/aufs/finfo.c b/fs/aufs/finfo.c -new file mode 100644 -index 000000000000..448c5e9cd85d ---- /dev/null -+++ b/fs/aufs/finfo.c -@@ -0,0 +1,149 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * file private data -+ */ -+ -+#include "aufs.h" -+ -+void au_hfput(struct au_hfile *hf, int execed) -+{ -+ if (execed) -+ allow_write_access(hf->hf_file); -+ fput(hf->hf_file); -+ hf->hf_file = NULL; -+ au_lcnt_dec(&hf->hf_br->br_nfiles); -+ hf->hf_br = NULL; -+} -+ -+void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *val) -+{ -+ struct au_finfo *finfo = au_fi(file); -+ struct au_hfile *hf; -+ struct au_fidir *fidir; -+ -+ fidir = finfo->fi_hdir; -+ if (!fidir) { -+ AuDebugOn(finfo->fi_btop != bindex); -+ hf = &finfo->fi_htop; -+ } else -+ hf = fidir->fd_hfile + bindex; -+ -+ if (hf && hf->hf_file) -+ au_hfput(hf, vfsub_file_execed(file)); -+ if (val) { -+ FiMustWriteLock(file); -+ AuDebugOn(IS_ERR_OR_NULL(file->f_path.dentry)); -+ hf->hf_file = val; -+ hf->hf_br = au_sbr(file->f_path.dentry->d_sb, bindex); -+ } -+} -+ -+void au_update_figen(struct file *file) -+{ -+ atomic_set(&au_fi(file)->fi_generation, au_digen(file->f_path.dentry)); -+ /* smp_mb(); */ /* atomic_set */ -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct au_fidir *au_fidir_alloc(struct super_block *sb) -+{ -+ struct au_fidir *fidir; -+ int nbr; -+ -+ nbr = au_sbbot(sb) + 1; -+ if (nbr < 2) -+ nbr = 2; /* initial allocate for 2 branches */ -+ fidir = kzalloc(au_fidir_sz(nbr), GFP_NOFS); -+ if (fidir) { -+ fidir->fd_bbot = -1; -+ fidir->fd_nent = nbr; -+ } -+ -+ return fidir; -+} -+ -+int au_fidir_realloc(struct au_finfo *finfo, int nbr, int may_shrink) -+{ -+ int err; -+ struct au_fidir *fidir, *p; -+ -+ AuRwMustWriteLock(&finfo->fi_rwsem); -+ fidir = finfo->fi_hdir; -+ AuDebugOn(!fidir); -+ -+ err = -ENOMEM; -+ p = au_kzrealloc(fidir, au_fidir_sz(fidir->fd_nent), au_fidir_sz(nbr), -+ GFP_NOFS, may_shrink); -+ if (p) { -+ p->fd_nent = nbr; -+ finfo->fi_hdir = p; -+ err = 0; -+ } -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+void au_finfo_fin(struct file *file) -+{ -+ struct au_finfo *finfo; -+ -+ au_lcnt_dec(&au_sbi(file->f_path.dentry->d_sb)->si_nfiles); -+ -+ finfo = au_fi(file); -+ AuDebugOn(finfo->fi_hdir); -+ AuRwDestroy(&finfo->fi_rwsem); -+ au_cache_free_finfo(finfo); -+} -+ -+void au_fi_init_once(void *_finfo) -+{ -+ struct au_finfo *finfo = _finfo; -+ -+ au_rw_init(&finfo->fi_rwsem); -+} -+ -+int au_finfo_init(struct file *file, struct au_fidir *fidir) -+{ -+ int err; -+ struct au_finfo *finfo; -+ struct dentry *dentry; -+ -+ err = -ENOMEM; -+ dentry = file->f_path.dentry; -+ finfo = au_cache_alloc_finfo(); -+ if (unlikely(!finfo)) -+ goto out; -+ -+ err = 0; -+ au_lcnt_inc(&au_sbi(dentry->d_sb)->si_nfiles); -+ au_rw_write_lock(&finfo->fi_rwsem); -+ finfo->fi_btop = -1; -+ finfo->fi_hdir = fidir; -+ atomic_set(&finfo->fi_generation, au_digen(dentry)); -+ /* smp_mb(); */ /* atomic_set */ -+ -+ file->private_data = finfo; -+ -+out: -+ return err; -+} -diff --git a/fs/aufs/fstype.h b/fs/aufs/fstype.h -new file mode 100644 -index 000000000000..510bd87e9404 ---- /dev/null -+++ b/fs/aufs/fstype.h -@@ -0,0 +1,401 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * judging filesystem type -+ */ -+ -+#ifndef __AUFS_FSTYPE_H__ -+#define __AUFS_FSTYPE_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/fs.h> -+#include <linux/magic.h> -+#include <linux/nfs_fs.h> -+#include <linux/romfs_fs.h> -+ -+static inline int au_test_aufs(struct super_block *sb) -+{ -+ return sb->s_magic == AUFS_SUPER_MAGIC; -+} -+ -+static inline const char *au_sbtype(struct super_block *sb) -+{ -+ return sb->s_type->name; -+} -+ -+static inline int au_test_iso9660(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_ISO9660_FS) -+ return sb->s_magic == ISOFS_SUPER_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_romfs(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_ROMFS_FS) -+ return sb->s_magic == ROMFS_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_cramfs(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_CRAMFS) -+ return sb->s_magic == CRAMFS_MAGIC; -+#endif -+ return 0; -+} -+ -+static inline int au_test_nfs(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_NFS_FS) -+ return sb->s_magic == NFS_SUPER_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_fuse(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_FUSE_FS) -+ return sb->s_magic == FUSE_SUPER_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_xfs(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_XFS_FS) -+ return sb->s_magic == XFS_SB_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_tmpfs(struct super_block *sb __maybe_unused) -+{ -+#ifdef CONFIG_TMPFS -+ return sb->s_magic == TMPFS_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_ecryptfs(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_ECRYPT_FS) -+ return !strcmp(au_sbtype(sb), "ecryptfs"); -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_ramfs(struct super_block *sb) -+{ -+ return sb->s_magic == RAMFS_MAGIC; -+} -+ -+static inline int au_test_ubifs(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_UBIFS_FS) -+ return sb->s_magic == UBIFS_SUPER_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_procfs(struct super_block *sb __maybe_unused) -+{ -+#ifdef CONFIG_PROC_FS -+ return sb->s_magic == PROC_SUPER_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_sysfs(struct super_block *sb __maybe_unused) -+{ -+#ifdef CONFIG_SYSFS -+ return sb->s_magic == SYSFS_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_configfs(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_CONFIGFS_FS) -+ return sb->s_magic == CONFIGFS_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_minix(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_MINIX_FS) -+ return sb->s_magic == MINIX3_SUPER_MAGIC -+ || sb->s_magic == MINIX2_SUPER_MAGIC -+ || sb->s_magic == MINIX2_SUPER_MAGIC2 -+ || sb->s_magic == MINIX_SUPER_MAGIC -+ || sb->s_magic == MINIX_SUPER_MAGIC2; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_fat(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_FAT_FS) -+ return sb->s_magic == MSDOS_SUPER_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_msdos(struct super_block *sb) -+{ -+ return au_test_fat(sb); -+} -+ -+static inline int au_test_vfat(struct super_block *sb) -+{ -+ return au_test_fat(sb); -+} -+ -+static inline int au_test_securityfs(struct super_block *sb __maybe_unused) -+{ -+#ifdef CONFIG_SECURITYFS -+ return sb->s_magic == SECURITYFS_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_squashfs(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_SQUASHFS) -+ return sb->s_magic == SQUASHFS_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_btrfs(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_BTRFS_FS) -+ return sb->s_magic == BTRFS_SUPER_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_xenfs(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_XENFS) -+ return sb->s_magic == XENFS_SUPER_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_debugfs(struct super_block *sb __maybe_unused) -+{ -+#ifdef CONFIG_DEBUG_FS -+ return sb->s_magic == DEBUGFS_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_nilfs(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_NILFS) -+ return sb->s_magic == NILFS_SUPER_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+static inline int au_test_hfsplus(struct super_block *sb __maybe_unused) -+{ -+#if IS_ENABLED(CONFIG_HFSPLUS_FS) -+ return sb->s_magic == HFSPLUS_SUPER_MAGIC; -+#else -+ return 0; -+#endif -+} -+ -+/* ---------------------------------------------------------------------- */ -+/* -+ * they can't be an aufs branch. -+ */ -+static inline int au_test_fs_unsuppoted(struct super_block *sb) -+{ -+ return -+#ifndef CONFIG_AUFS_BR_RAMFS -+ au_test_ramfs(sb) || -+#endif -+ au_test_procfs(sb) -+ || au_test_sysfs(sb) -+ || au_test_configfs(sb) -+ || au_test_debugfs(sb) -+ || au_test_securityfs(sb) -+ || au_test_xenfs(sb) -+ || au_test_ecryptfs(sb) -+ /* || !strcmp(au_sbtype(sb), "unionfs") */ -+ || au_test_aufs(sb); /* will be supported in next version */ -+} -+ -+static inline int au_test_fs_remote(struct super_block *sb) -+{ -+ return !au_test_tmpfs(sb) -+#ifdef CONFIG_AUFS_BR_RAMFS -+ && !au_test_ramfs(sb) -+#endif -+ && !(sb->s_type->fs_flags & FS_REQUIRES_DEV); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * Note: these functions (below) are created after reading ->getattr() in all -+ * filesystems under linux/fs. it means we have to do so in every update... -+ */ -+ -+/* -+ * some filesystems require getattr to refresh the inode attributes before -+ * referencing. -+ * in most cases, we can rely on the inode attribute in NFS (or every remote fs) -+ * and leave the work for d_revalidate() -+ */ -+static inline int au_test_fs_refresh_iattr(struct super_block *sb) -+{ -+ return au_test_nfs(sb) -+ || au_test_fuse(sb) -+ /* || au_test_btrfs(sb) */ /* untested */ -+ ; -+} -+ -+/* -+ * filesystems which don't maintain i_size or i_blocks. -+ */ -+static inline int au_test_fs_bad_iattr_size(struct super_block *sb) -+{ -+ return au_test_xfs(sb) -+ || au_test_btrfs(sb) -+ || au_test_ubifs(sb) -+ || au_test_hfsplus(sb) /* maintained, but incorrect */ -+ /* || au_test_minix(sb) */ /* untested */ -+ ; -+} -+ -+/* -+ * filesystems which don't store the correct value in some of their inode -+ * attributes. -+ */ -+static inline int au_test_fs_bad_iattr(struct super_block *sb) -+{ -+ return au_test_fs_bad_iattr_size(sb) -+ || au_test_fat(sb) -+ || au_test_msdos(sb) -+ || au_test_vfat(sb); -+} -+ -+/* they don't check i_nlink in link(2) */ -+static inline int au_test_fs_no_limit_nlink(struct super_block *sb) -+{ -+ return au_test_tmpfs(sb) -+#ifdef CONFIG_AUFS_BR_RAMFS -+ || au_test_ramfs(sb) -+#endif -+ || au_test_ubifs(sb) -+ || au_test_hfsplus(sb); -+} -+ -+/* -+ * filesystems which sets S_NOATIME and S_NOCMTIME. -+ */ -+static inline int au_test_fs_notime(struct super_block *sb) -+{ -+ return au_test_nfs(sb) -+ || au_test_fuse(sb) -+ || au_test_ubifs(sb) -+ ; -+} -+ -+/* temporary support for i#1 in cramfs */ -+static inline int au_test_fs_unique_ino(struct inode *inode) -+{ -+ if (au_test_cramfs(inode->i_sb)) -+ return inode->i_ino != 1; -+ return 1; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * the filesystem where the xino files placed must support i/o after unlink and -+ * maintain i_size and i_blocks. -+ */ -+static inline int au_test_fs_bad_xino(struct super_block *sb) -+{ -+ return au_test_fs_remote(sb) -+ || au_test_fs_bad_iattr_size(sb) -+ /* don't want unnecessary work for xino */ -+ || au_test_aufs(sb) -+ || au_test_ecryptfs(sb) -+ || au_test_nilfs(sb); -+} -+ -+static inline int au_test_fs_trunc_xino(struct super_block *sb) -+{ -+ return au_test_tmpfs(sb) -+ || au_test_ramfs(sb); -+} -+ -+/* -+ * test if the @sb is real-readonly. -+ */ -+static inline int au_test_fs_rr(struct super_block *sb) -+{ -+ return au_test_squashfs(sb) -+ || au_test_iso9660(sb) -+ || au_test_cramfs(sb) -+ || au_test_romfs(sb); -+} -+ -+/* -+ * test if the @inode is nfs with 'noacl' option -+ * NFS always sets SB_POSIXACL regardless its mount option 'noacl.' -+ */ -+static inline int au_test_nfs_noacl(struct inode *inode) -+{ -+ return au_test_nfs(inode->i_sb) -+ /* && IS_POSIXACL(inode) */ -+ && !nfs_server_capable(inode, NFS_CAP_ACLS); -+} -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_FSTYPE_H__ */ -diff --git a/fs/aufs/hbl.h b/fs/aufs/hbl.h -new file mode 100644 -index 000000000000..6db65b16b08a ---- /dev/null -+++ b/fs/aufs/hbl.h -@@ -0,0 +1,65 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2017-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * helpers for hlist_bl.h -+ */ -+ -+#ifndef __AUFS_HBL_H__ -+#define __AUFS_HBL_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/list_bl.h> -+ -+static inline void au_hbl_add(struct hlist_bl_node *node, -+ struct hlist_bl_head *hbl) -+{ -+ hlist_bl_lock(hbl); -+ hlist_bl_add_head(node, hbl); -+ hlist_bl_unlock(hbl); -+} -+ -+static inline void au_hbl_del(struct hlist_bl_node *node, -+ struct hlist_bl_head *hbl) -+{ -+ hlist_bl_lock(hbl); -+ hlist_bl_del(node); -+ hlist_bl_unlock(hbl); -+} -+ -+#define au_hbl_for_each(pos, head) \ -+ for (pos = hlist_bl_first(head); \ -+ pos; \ -+ pos = pos->next) -+ -+static inline unsigned long au_hbl_count(struct hlist_bl_head *hbl) -+{ -+ unsigned long cnt; -+ struct hlist_bl_node *pos; -+ -+ cnt = 0; -+ hlist_bl_lock(hbl); -+ au_hbl_for_each(pos, hbl) -+ cnt++; -+ hlist_bl_unlock(hbl); -+ return cnt; -+} -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_HBL_H__ */ -diff --git a/fs/aufs/hfsnotify.c b/fs/aufs/hfsnotify.c -new file mode 100644 -index 000000000000..7945ae3ca073 ---- /dev/null -+++ b/fs/aufs/hfsnotify.c -@@ -0,0 +1,288 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * fsnotify for the lower directories -+ */ -+ -+#include "aufs.h" -+ -+/* FS_IN_IGNORED is unnecessary */ -+static const __u32 AuHfsnMask = (FS_MOVED_TO | FS_MOVED_FROM | FS_DELETE -+ | FS_CREATE | FS_EVENT_ON_CHILD); -+static DECLARE_WAIT_QUEUE_HEAD(au_hfsn_wq); -+static __cacheline_aligned_in_smp atomic64_t au_hfsn_ifree = ATOMIC64_INIT(0); -+ -+static void au_hfsn_free_mark(struct fsnotify_mark *mark) -+{ -+ struct au_hnotify *hn = container_of(mark, struct au_hnotify, -+ hn_mark); -+ /* AuDbg("here\n"); */ -+ au_cache_free_hnotify(hn); -+ smp_mb__before_atomic(); /* for atomic64_dec */ -+ if (atomic64_dec_and_test(&au_hfsn_ifree)) -+ wake_up(&au_hfsn_wq); -+} -+ -+static int au_hfsn_alloc(struct au_hinode *hinode) -+{ -+ int err; -+ struct au_hnotify *hn; -+ struct super_block *sb; -+ struct au_branch *br; -+ struct fsnotify_mark *mark; -+ aufs_bindex_t bindex; -+ -+ hn = hinode->hi_notify; -+ sb = hn->hn_aufs_inode->i_sb; -+ bindex = au_br_index(sb, hinode->hi_id); -+ br = au_sbr(sb, bindex); -+ AuDebugOn(!br->br_hfsn); -+ -+ mark = &hn->hn_mark; -+ fsnotify_init_mark(mark, br->br_hfsn->hfsn_group); -+ mark->mask = AuHfsnMask; -+ /* -+ * by udba rename or rmdir, aufs assign a new inode to the known -+ * h_inode, so specify 1 to allow dups. -+ */ -+ lockdep_off(); -+ err = fsnotify_add_inode_mark(mark, hinode->hi_inode, /*allow_dups*/1); -+ lockdep_on(); -+ -+ return err; -+} -+ -+static int au_hfsn_free(struct au_hinode *hinode, struct au_hnotify *hn) -+{ -+ struct fsnotify_mark *mark; -+ unsigned long long ull; -+ struct fsnotify_group *group; -+ -+ ull = atomic64_inc_return(&au_hfsn_ifree); -+ BUG_ON(!ull); -+ -+ mark = &hn->hn_mark; -+ spin_lock(&mark->lock); -+ group = mark->group; -+ fsnotify_get_group(group); -+ spin_unlock(&mark->lock); -+ lockdep_off(); -+ fsnotify_destroy_mark(mark, group); -+ fsnotify_put_mark(mark); -+ fsnotify_put_group(group); -+ lockdep_on(); -+ -+ /* free hn by myself */ -+ return 0; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static void au_hfsn_ctl(struct au_hinode *hinode, int do_set) -+{ -+ struct fsnotify_mark *mark; -+ -+ mark = &hinode->hi_notify->hn_mark; -+ spin_lock(&mark->lock); -+ if (do_set) { -+ AuDebugOn(mark->mask & AuHfsnMask); -+ mark->mask |= AuHfsnMask; -+ } else { -+ AuDebugOn(!(mark->mask & AuHfsnMask)); -+ mark->mask &= ~AuHfsnMask; -+ } -+ spin_unlock(&mark->lock); -+ /* fsnotify_recalc_inode_mask(hinode->hi_inode); */ -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* #define AuDbgHnotify */ -+#ifdef AuDbgHnotify -+static char *au_hfsn_name(u32 mask) -+{ -+#ifdef CONFIG_AUFS_DEBUG -+#define test_ret(flag) \ -+ do { \ -+ if (mask & flag) \ -+ return #flag; \ -+ } while (0) -+ test_ret(FS_ACCESS); -+ test_ret(FS_MODIFY); -+ test_ret(FS_ATTRIB); -+ test_ret(FS_CLOSE_WRITE); -+ test_ret(FS_CLOSE_NOWRITE); -+ test_ret(FS_OPEN); -+ test_ret(FS_MOVED_FROM); -+ test_ret(FS_MOVED_TO); -+ test_ret(FS_CREATE); -+ test_ret(FS_DELETE); -+ test_ret(FS_DELETE_SELF); -+ test_ret(FS_MOVE_SELF); -+ test_ret(FS_UNMOUNT); -+ test_ret(FS_Q_OVERFLOW); -+ test_ret(FS_IN_IGNORED); -+ test_ret(FS_ISDIR); -+ test_ret(FS_IN_ONESHOT); -+ test_ret(FS_EVENT_ON_CHILD); -+ return ""; -+#undef test_ret -+#else -+ return "??"; -+#endif -+} -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+static void au_hfsn_free_group(struct fsnotify_group *group) -+{ -+ struct au_br_hfsnotify *hfsn = group->private; -+ -+ /* AuDbg("here\n"); */ -+ au_kfree_try_rcu(hfsn); -+} -+ -+static int au_hfsn_handle_event(struct fsnotify_group *group, -+ struct inode *inode, -+ u32 mask, const void *data, int data_type, -+ const struct qstr *file_name, u32 cookie, -+ struct fsnotify_iter_info *iter_info) -+{ -+ int err; -+ struct au_hnotify *hnotify; -+ struct inode *h_dir, *h_inode; -+ struct fsnotify_mark *inode_mark; -+ -+ AuDebugOn(data_type != FSNOTIFY_EVENT_INODE); -+ -+ err = 0; -+ /* if FS_UNMOUNT happens, there must be another bug */ -+ AuDebugOn(mask & FS_UNMOUNT); -+ if (mask & (FS_IN_IGNORED | FS_UNMOUNT)) -+ goto out; -+ -+ h_dir = inode; -+ h_inode = NULL; -+#ifdef AuDbgHnotify -+ au_debug_on(); -+ if (1 || h_child_qstr.len != sizeof(AUFS_XINO_FNAME) - 1 -+ || strncmp(h_child_qstr.name, AUFS_XINO_FNAME, h_child_qstr.len)) { -+ AuDbg("i%lu, mask 0x%x %s, hcname %.*s, hi%lu\n", -+ h_dir->i_ino, mask, au_hfsn_name(mask), -+ AuLNPair(&h_child_qstr), h_inode ? h_inode->i_ino : 0); -+ /* WARN_ON(1); */ -+ } -+ au_debug_off(); -+#endif -+ -+ inode_mark = fsnotify_iter_inode_mark(iter_info); -+ AuDebugOn(!inode_mark); -+ hnotify = container_of(inode_mark, struct au_hnotify, hn_mark); -+ err = au_hnotify(h_dir, hnotify, mask, file_name, h_inode); -+ -+out: -+ return err; -+} -+ -+static struct fsnotify_ops au_hfsn_ops = { -+ .handle_event = au_hfsn_handle_event, -+ .free_group_priv = au_hfsn_free_group, -+ .free_mark = au_hfsn_free_mark -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+static void au_hfsn_fin_br(struct au_branch *br) -+{ -+ struct au_br_hfsnotify *hfsn; -+ -+ hfsn = br->br_hfsn; -+ if (hfsn) { -+ lockdep_off(); -+ fsnotify_put_group(hfsn->hfsn_group); -+ lockdep_on(); -+ } -+} -+ -+static int au_hfsn_init_br(struct au_branch *br, int perm) -+{ -+ int err; -+ struct fsnotify_group *group; -+ struct au_br_hfsnotify *hfsn; -+ -+ err = 0; -+ br->br_hfsn = NULL; -+ if (!au_br_hnotifyable(perm)) -+ goto out; -+ -+ err = -ENOMEM; -+ hfsn = kmalloc(sizeof(*hfsn), GFP_NOFS); -+ if (unlikely(!hfsn)) -+ goto out; -+ -+ err = 0; -+ group = fsnotify_alloc_group(&au_hfsn_ops); -+ if (IS_ERR(group)) { -+ err = PTR_ERR(group); -+ pr_err("fsnotify_alloc_group() failed, %d\n", err); -+ goto out_hfsn; -+ } -+ -+ group->private = hfsn; -+ hfsn->hfsn_group = group; -+ br->br_hfsn = hfsn; -+ goto out; /* success */ -+ -+out_hfsn: -+ au_kfree_try_rcu(hfsn); -+out: -+ return err; -+} -+ -+static int au_hfsn_reset_br(unsigned int udba, struct au_branch *br, int perm) -+{ -+ int err; -+ -+ err = 0; -+ if (!br->br_hfsn) -+ err = au_hfsn_init_br(br, perm); -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static void au_hfsn_fin(void) -+{ -+ AuDbg("au_hfsn_ifree %lld\n", (long long)atomic64_read(&au_hfsn_ifree)); -+ wait_event(au_hfsn_wq, !atomic64_read(&au_hfsn_ifree)); -+} -+ -+const struct au_hnotify_op au_hnotify_op = { -+ .ctl = au_hfsn_ctl, -+ .alloc = au_hfsn_alloc, -+ .free = au_hfsn_free, -+ -+ .fin = au_hfsn_fin, -+ -+ .reset_br = au_hfsn_reset_br, -+ .fin_br = au_hfsn_fin_br, -+ .init_br = au_hfsn_init_br -+}; -diff --git a/fs/aufs/hfsplus.c b/fs/aufs/hfsplus.c -new file mode 100644 -index 000000000000..3bd869a69c8f ---- /dev/null -+++ b/fs/aufs/hfsplus.c -@@ -0,0 +1,60 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2010-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * special support for filesystems which acquires an inode mutex -+ * at final closing a file, eg, hfsplus. -+ * -+ * This trick is very simple and stupid, just to open the file before really -+ * necessary open to tell hfsplus that this is not the final closing. -+ * The caller should call au_h_open_pre() after acquiring the inode mutex, -+ * and au_h_open_post() after releasing it. -+ */ -+ -+#include "aufs.h" -+ -+struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex, -+ int force_wr) -+{ -+ struct file *h_file; -+ struct dentry *h_dentry; -+ -+ h_dentry = au_h_dptr(dentry, bindex); -+ AuDebugOn(!h_dentry); -+ AuDebugOn(d_is_negative(h_dentry)); -+ -+ h_file = NULL; -+ if (au_test_hfsplus(h_dentry->d_sb) -+ && d_is_reg(h_dentry)) -+ h_file = au_h_open(dentry, bindex, -+ O_RDONLY | O_NOATIME | O_LARGEFILE, -+ /*file*/NULL, force_wr); -+ return h_file; -+} -+ -+void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex, -+ struct file *h_file) -+{ -+ struct au_branch *br; -+ -+ if (h_file) { -+ fput(h_file); -+ br = au_sbr(dentry->d_sb, bindex); -+ au_lcnt_dec(&br->br_nfiles); -+ } -+} -diff --git a/fs/aufs/hnotify.c b/fs/aufs/hnotify.c -new file mode 100644 -index 000000000000..2e7c2cdb8202 ---- /dev/null -+++ b/fs/aufs/hnotify.c -@@ -0,0 +1,721 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * abstraction to notify the direct changes on lower directories -+ */ -+ -+/* #include <linux/iversion.h> */ -+#include "aufs.h" -+ -+int au_hn_alloc(struct au_hinode *hinode, struct inode *inode) -+{ -+ int err; -+ struct au_hnotify *hn; -+ -+ err = -ENOMEM; -+ hn = au_cache_alloc_hnotify(); -+ if (hn) { -+ hn->hn_aufs_inode = inode; -+ hinode->hi_notify = hn; -+ err = au_hnotify_op.alloc(hinode); -+ AuTraceErr(err); -+ if (unlikely(err)) { -+ hinode->hi_notify = NULL; -+ au_cache_free_hnotify(hn); -+ /* -+ * The upper dir was removed by udba, but the same named -+ * dir left. In this case, aufs assigns a new inode -+ * number and set the monitor again. -+ * For the lower dir, the old monitor is still left. -+ */ -+ if (err == -EEXIST) -+ err = 0; -+ } -+ } -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+void au_hn_free(struct au_hinode *hinode) -+{ -+ struct au_hnotify *hn; -+ -+ hn = hinode->hi_notify; -+ if (hn) { -+ hinode->hi_notify = NULL; -+ if (au_hnotify_op.free(hinode, hn)) -+ au_cache_free_hnotify(hn); -+ } -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+void au_hn_ctl(struct au_hinode *hinode, int do_set) -+{ -+ if (hinode->hi_notify) -+ au_hnotify_op.ctl(hinode, do_set); -+} -+ -+void au_hn_reset(struct inode *inode, unsigned int flags) -+{ -+ aufs_bindex_t bindex, bbot; -+ struct inode *hi; -+ struct dentry *iwhdentry; -+ -+ bbot = au_ibbot(inode); -+ for (bindex = au_ibtop(inode); bindex <= bbot; bindex++) { -+ hi = au_h_iptr(inode, bindex); -+ if (!hi) -+ continue; -+ -+ /* inode_lock_nested(hi, AuLsc_I_CHILD); */ -+ iwhdentry = au_hi_wh(inode, bindex); -+ if (iwhdentry) -+ dget(iwhdentry); -+ au_igrab(hi); -+ au_set_h_iptr(inode, bindex, NULL, 0); -+ au_set_h_iptr(inode, bindex, au_igrab(hi), -+ flags & ~AuHi_XINO); -+ iput(hi); -+ dput(iwhdentry); -+ /* inode_unlock(hi); */ -+ } -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int hn_xino(struct inode *inode, struct inode *h_inode) -+{ -+ int err; -+ aufs_bindex_t bindex, bbot, bfound, btop; -+ struct inode *h_i; -+ -+ err = 0; -+ if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { -+ pr_warn("branch root dir was changed\n"); -+ goto out; -+ } -+ -+ bfound = -1; -+ bbot = au_ibbot(inode); -+ btop = au_ibtop(inode); -+#if 0 /* reserved for future use */ -+ if (bindex == bbot) { -+ /* keep this ino in rename case */ -+ goto out; -+ } -+#endif -+ for (bindex = btop; bindex <= bbot; bindex++) -+ if (au_h_iptr(inode, bindex) == h_inode) { -+ bfound = bindex; -+ break; -+ } -+ if (bfound < 0) -+ goto out; -+ -+ for (bindex = btop; bindex <= bbot; bindex++) { -+ h_i = au_h_iptr(inode, bindex); -+ if (!h_i) -+ continue; -+ -+ err = au_xino_write(inode->i_sb, bindex, h_i->i_ino, /*ino*/0); -+ /* ignore this error */ -+ /* bad action? */ -+ } -+ -+ /* children inode number will be broken */ -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+static int hn_gen_tree(struct dentry *dentry) -+{ -+ int err, i, j, ndentry; -+ struct au_dcsub_pages dpages; -+ struct au_dpage *dpage; -+ struct dentry **dentries; -+ -+ err = au_dpages_init(&dpages, GFP_NOFS); -+ if (unlikely(err)) -+ goto out; -+ err = au_dcsub_pages(&dpages, dentry, NULL, NULL); -+ if (unlikely(err)) -+ goto out_dpages; -+ -+ for (i = 0; i < dpages.ndpage; i++) { -+ dpage = dpages.dpages + i; -+ dentries = dpage->dentries; -+ ndentry = dpage->ndentry; -+ for (j = 0; j < ndentry; j++) { -+ struct dentry *d; -+ -+ d = dentries[j]; -+ if (IS_ROOT(d)) -+ continue; -+ -+ au_digen_dec(d); -+ if (d_really_is_positive(d)) -+ /* todo: reset children xino? -+ cached children only? */ -+ au_iigen_dec(d_inode(d)); -+ } -+ } -+ -+out_dpages: -+ au_dpages_free(&dpages); -+ -+#if 0 -+ /* discard children */ -+ dentry_unhash(dentry); -+ dput(dentry); -+#endif -+out: -+ return err; -+} -+ -+/* -+ * return 0 if processed. -+ */ -+static int hn_gen_by_inode(char *name, unsigned int nlen, struct inode *inode, -+ const unsigned int isdir) -+{ -+ int err; -+ struct dentry *d; -+ struct qstr *dname; -+ -+ err = 1; -+ if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { -+ pr_warn("branch root dir was changed\n"); -+ err = 0; -+ goto out; -+ } -+ -+ if (!isdir) { -+ AuDebugOn(!name); -+ au_iigen_dec(inode); -+ spin_lock(&inode->i_lock); -+ hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias) { -+ spin_lock(&d->d_lock); -+ dname = &d->d_name; -+ if (dname->len != nlen -+ && memcmp(dname->name, name, nlen)) { -+ spin_unlock(&d->d_lock); -+ continue; -+ } -+ err = 0; -+ au_digen_dec(d); -+ spin_unlock(&d->d_lock); -+ break; -+ } -+ spin_unlock(&inode->i_lock); -+ } else { -+ au_fset_si(au_sbi(inode->i_sb), FAILED_REFRESH_DIR); -+ d = d_find_any_alias(inode); -+ if (!d) { -+ au_iigen_dec(inode); -+ goto out; -+ } -+ -+ spin_lock(&d->d_lock); -+ dname = &d->d_name; -+ if (dname->len == nlen && !memcmp(dname->name, name, nlen)) { -+ spin_unlock(&d->d_lock); -+ err = hn_gen_tree(d); -+ spin_lock(&d->d_lock); -+ } -+ spin_unlock(&d->d_lock); -+ dput(d); -+ } -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+static int hn_gen_by_name(struct dentry *dentry, const unsigned int isdir) -+{ -+ int err; -+ -+ if (IS_ROOT(dentry)) { -+ pr_warn("branch root dir was changed\n"); -+ return 0; -+ } -+ -+ err = 0; -+ if (!isdir) { -+ au_digen_dec(dentry); -+ if (d_really_is_positive(dentry)) -+ au_iigen_dec(d_inode(dentry)); -+ } else { -+ au_fset_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR); -+ if (d_really_is_positive(dentry)) -+ err = hn_gen_tree(dentry); -+ } -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* hnotify job flags */ -+#define AuHnJob_XINO0 1 -+#define AuHnJob_GEN (1 << 1) -+#define AuHnJob_DIRENT (1 << 2) -+#define AuHnJob_ISDIR (1 << 3) -+#define AuHnJob_TRYXINO0 (1 << 4) -+#define AuHnJob_MNTPNT (1 << 5) -+#define au_ftest_hnjob(flags, name) ((flags) & AuHnJob_##name) -+#define au_fset_hnjob(flags, name) \ -+ do { (flags) |= AuHnJob_##name; } while (0) -+#define au_fclr_hnjob(flags, name) \ -+ do { (flags) &= ~AuHnJob_##name; } while (0) -+ -+enum { -+ AuHn_CHILD, -+ AuHn_PARENT, -+ AuHnLast -+}; -+ -+struct au_hnotify_args { -+ struct inode *h_dir, *dir, *h_child_inode; -+ u32 mask; -+ unsigned int flags[AuHnLast]; -+ unsigned int h_child_nlen; -+ char h_child_name[]; -+}; -+ -+struct hn_job_args { -+ unsigned int flags; -+ struct inode *inode, *h_inode, *dir, *h_dir; -+ struct dentry *dentry; -+ char *h_name; -+ int h_nlen; -+}; -+ -+static int hn_job(struct hn_job_args *a) -+{ -+ const unsigned int isdir = au_ftest_hnjob(a->flags, ISDIR); -+ int e; -+ -+ /* reset xino */ -+ if (au_ftest_hnjob(a->flags, XINO0) && a->inode) -+ hn_xino(a->inode, a->h_inode); /* ignore this error */ -+ -+ if (au_ftest_hnjob(a->flags, TRYXINO0) -+ && a->inode -+ && a->h_inode) { -+ inode_lock_shared_nested(a->h_inode, AuLsc_I_CHILD); -+ if (!a->h_inode->i_nlink -+ && !(a->h_inode->i_state & I_LINKABLE)) -+ hn_xino(a->inode, a->h_inode); /* ignore this error */ -+ inode_unlock_shared(a->h_inode); -+ } -+ -+ /* make the generation obsolete */ -+ if (au_ftest_hnjob(a->flags, GEN)) { -+ e = -1; -+ if (a->inode) -+ e = hn_gen_by_inode(a->h_name, a->h_nlen, a->inode, -+ isdir); -+ if (e && a->dentry) -+ hn_gen_by_name(a->dentry, isdir); -+ /* ignore this error */ -+ } -+ -+ /* make dir entries obsolete */ -+ if (au_ftest_hnjob(a->flags, DIRENT) && a->inode) { -+ struct au_vdir *vdir; -+ -+ vdir = au_ivdir(a->inode); -+ if (vdir) -+ vdir->vd_jiffy = 0; -+ /* IMustLock(a->inode); */ -+ /* inode_inc_iversion(a->inode); */ -+ } -+ -+ /* can do nothing but warn */ -+ if (au_ftest_hnjob(a->flags, MNTPNT) -+ && a->dentry -+ && d_mountpoint(a->dentry)) -+ pr_warn("mount-point %pd is removed or renamed\n", a->dentry); -+ -+ return 0; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static struct dentry *lookup_wlock_by_name(char *name, unsigned int nlen, -+ struct inode *dir) -+{ -+ struct dentry *dentry, *d, *parent; -+ struct qstr *dname; -+ -+ parent = d_find_any_alias(dir); -+ if (!parent) -+ return NULL; -+ -+ dentry = NULL; -+ spin_lock(&parent->d_lock); -+ list_for_each_entry(d, &parent->d_subdirs, d_child) { -+ /* AuDbg("%pd\n", d); */ -+ spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED); -+ dname = &d->d_name; -+ if (dname->len != nlen || memcmp(dname->name, name, nlen)) -+ goto cont_unlock; -+ if (au_di(d)) -+ au_digen_dec(d); -+ else -+ goto cont_unlock; -+ if (au_dcount(d) > 0) { -+ dentry = dget_dlock(d); -+ spin_unlock(&d->d_lock); -+ break; -+ } -+ -+cont_unlock: -+ spin_unlock(&d->d_lock); -+ } -+ spin_unlock(&parent->d_lock); -+ dput(parent); -+ -+ if (dentry) -+ di_write_lock_child(dentry); -+ -+ return dentry; -+} -+ -+static struct inode *lookup_wlock_by_ino(struct super_block *sb, -+ aufs_bindex_t bindex, ino_t h_ino) -+{ -+ struct inode *inode; -+ ino_t ino; -+ int err; -+ -+ inode = NULL; -+ err = au_xino_read(sb, bindex, h_ino, &ino); -+ if (!err && ino) -+ inode = ilookup(sb, ino); -+ if (!inode) -+ goto out; -+ -+ if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { -+ pr_warn("wrong root branch\n"); -+ iput(inode); -+ inode = NULL; -+ goto out; -+ } -+ -+ ii_write_lock_child(inode); -+ -+out: -+ return inode; -+} -+ -+static void au_hn_bh(void *_args) -+{ -+ struct au_hnotify_args *a = _args; -+ struct super_block *sb; -+ aufs_bindex_t bindex, bbot, bfound; -+ unsigned char xino, try_iput; -+ int err; -+ struct inode *inode; -+ ino_t h_ino; -+ struct hn_job_args args; -+ struct dentry *dentry; -+ struct au_sbinfo *sbinfo; -+ -+ AuDebugOn(!_args); -+ AuDebugOn(!a->h_dir); -+ AuDebugOn(!a->dir); -+ AuDebugOn(!a->mask); -+ AuDbg("mask 0x%x, i%lu, hi%lu, hci%lu\n", -+ a->mask, a->dir->i_ino, a->h_dir->i_ino, -+ a->h_child_inode ? a->h_child_inode->i_ino : 0); -+ -+ inode = NULL; -+ dentry = NULL; -+ /* -+ * do not lock a->dir->i_mutex here -+ * because of d_revalidate() may cause a deadlock. -+ */ -+ sb = a->dir->i_sb; -+ AuDebugOn(!sb); -+ sbinfo = au_sbi(sb); -+ AuDebugOn(!sbinfo); -+ si_write_lock(sb, AuLock_NOPLMW); -+ -+ if (au_opt_test(sbinfo->si_mntflags, DIRREN)) -+ switch (a->mask & FS_EVENTS_POSS_ON_CHILD) { -+ case FS_MOVED_FROM: -+ case FS_MOVED_TO: -+ AuWarn1("DIRREN with UDBA may not work correctly " -+ "for the direct rename(2)\n"); -+ } -+ -+ ii_read_lock_parent(a->dir); -+ bfound = -1; -+ bbot = au_ibbot(a->dir); -+ for (bindex = au_ibtop(a->dir); bindex <= bbot; bindex++) -+ if (au_h_iptr(a->dir, bindex) == a->h_dir) { -+ bfound = bindex; -+ break; -+ } -+ ii_read_unlock(a->dir); -+ if (unlikely(bfound < 0)) -+ goto out; -+ -+ xino = !!au_opt_test(au_mntflags(sb), XINO); -+ h_ino = 0; -+ if (a->h_child_inode) -+ h_ino = a->h_child_inode->i_ino; -+ -+ if (a->h_child_nlen -+ && (au_ftest_hnjob(a->flags[AuHn_CHILD], GEN) -+ || au_ftest_hnjob(a->flags[AuHn_CHILD], MNTPNT))) -+ dentry = lookup_wlock_by_name(a->h_child_name, a->h_child_nlen, -+ a->dir); -+ try_iput = 0; -+ if (dentry && d_really_is_positive(dentry)) -+ inode = d_inode(dentry); -+ if (xino && !inode && h_ino -+ && (au_ftest_hnjob(a->flags[AuHn_CHILD], XINO0) -+ || au_ftest_hnjob(a->flags[AuHn_CHILD], TRYXINO0) -+ || au_ftest_hnjob(a->flags[AuHn_CHILD], GEN))) { -+ inode = lookup_wlock_by_ino(sb, bfound, h_ino); -+ try_iput = 1; -+ } -+ -+ args.flags = a->flags[AuHn_CHILD]; -+ args.dentry = dentry; -+ args.inode = inode; -+ args.h_inode = a->h_child_inode; -+ args.dir = a->dir; -+ args.h_dir = a->h_dir; -+ args.h_name = a->h_child_name; -+ args.h_nlen = a->h_child_nlen; -+ err = hn_job(&args); -+ if (dentry) { -+ if (au_di(dentry)) -+ di_write_unlock(dentry); -+ dput(dentry); -+ } -+ if (inode && try_iput) { -+ ii_write_unlock(inode); -+ iput(inode); -+ } -+ -+ ii_write_lock_parent(a->dir); -+ args.flags = a->flags[AuHn_PARENT]; -+ args.dentry = NULL; -+ args.inode = a->dir; -+ args.h_inode = a->h_dir; -+ args.dir = NULL; -+ args.h_dir = NULL; -+ args.h_name = NULL; -+ args.h_nlen = 0; -+ err = hn_job(&args); -+ ii_write_unlock(a->dir); -+ -+out: -+ iput(a->h_child_inode); -+ iput(a->h_dir); -+ iput(a->dir); -+ si_write_unlock(sb); -+ au_nwt_done(&sbinfo->si_nowait); -+ au_kfree_rcu(a); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask, -+ const struct qstr *h_child_qstr, struct inode *h_child_inode) -+{ -+ int err, len; -+ unsigned int flags[AuHnLast], f; -+ unsigned char isdir, isroot, wh; -+ struct inode *dir; -+ struct au_hnotify_args *args; -+ char *p, *h_child_name; -+ -+ err = 0; -+ AuDebugOn(!hnotify || !hnotify->hn_aufs_inode); -+ dir = igrab(hnotify->hn_aufs_inode); -+ if (!dir) -+ goto out; -+ -+ isroot = (dir->i_ino == AUFS_ROOT_INO); -+ wh = 0; -+ h_child_name = (void *)h_child_qstr->name; -+ len = h_child_qstr->len; -+ if (h_child_name) { -+ if (len > AUFS_WH_PFX_LEN -+ && !memcmp(h_child_name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { -+ h_child_name += AUFS_WH_PFX_LEN; -+ len -= AUFS_WH_PFX_LEN; -+ wh = 1; -+ } -+ } -+ -+ isdir = 0; -+ if (h_child_inode) -+ isdir = !!S_ISDIR(h_child_inode->i_mode); -+ flags[AuHn_PARENT] = AuHnJob_ISDIR; -+ flags[AuHn_CHILD] = 0; -+ if (isdir) -+ flags[AuHn_CHILD] = AuHnJob_ISDIR; -+ au_fset_hnjob(flags[AuHn_PARENT], DIRENT); -+ au_fset_hnjob(flags[AuHn_CHILD], GEN); -+ switch (mask & ALL_FSNOTIFY_DIRENT_EVENTS) { -+ case FS_MOVED_FROM: -+ case FS_MOVED_TO: -+ au_fset_hnjob(flags[AuHn_CHILD], XINO0); -+ au_fset_hnjob(flags[AuHn_CHILD], MNTPNT); -+ /*FALLTHROUGH*/ -+ case FS_CREATE: -+ AuDebugOn(!h_child_name); -+ break; -+ -+ case FS_DELETE: -+ /* -+ * aufs never be able to get this child inode. -+ * revalidation should be in d_revalidate() -+ * by checking i_nlink, i_generation or d_unhashed(). -+ */ -+ AuDebugOn(!h_child_name); -+ au_fset_hnjob(flags[AuHn_CHILD], TRYXINO0); -+ au_fset_hnjob(flags[AuHn_CHILD], MNTPNT); -+ break; -+ -+ default: -+ AuDebugOn(1); -+ } -+ -+ if (wh) -+ h_child_inode = NULL; -+ -+ err = -ENOMEM; -+ /* iput() and kfree() will be called in au_hnotify() */ -+ args = kmalloc(sizeof(*args) + len + 1, GFP_NOFS); -+ if (unlikely(!args)) { -+ AuErr1("no memory\n"); -+ iput(dir); -+ goto out; -+ } -+ args->flags[AuHn_PARENT] = flags[AuHn_PARENT]; -+ args->flags[AuHn_CHILD] = flags[AuHn_CHILD]; -+ args->mask = mask; -+ args->dir = dir; -+ args->h_dir = igrab(h_dir); -+ if (h_child_inode) -+ h_child_inode = igrab(h_child_inode); /* can be NULL */ -+ args->h_child_inode = h_child_inode; -+ args->h_child_nlen = len; -+ if (len) { -+ p = (void *)args; -+ p += sizeof(*args); -+ memcpy(p, h_child_name, len); -+ p[len] = 0; -+ } -+ -+ /* NFS fires the event for silly-renamed one from kworker */ -+ f = 0; -+ if (!dir->i_nlink -+ || (au_test_nfs(h_dir->i_sb) && (mask & FS_DELETE))) -+ f = AuWkq_NEST; -+ err = au_wkq_nowait(au_hn_bh, args, dir->i_sb, f); -+ if (unlikely(err)) { -+ pr_err("wkq %d\n", err); -+ iput(args->h_child_inode); -+ iput(args->h_dir); -+ iput(args->dir); -+ au_kfree_rcu(args); -+ } -+ -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm) -+{ -+ int err; -+ -+ AuDebugOn(!(udba & AuOptMask_UDBA)); -+ -+ err = 0; -+ if (au_hnotify_op.reset_br) -+ err = au_hnotify_op.reset_br(udba, br, perm); -+ -+ return err; -+} -+ -+int au_hnotify_init_br(struct au_branch *br, int perm) -+{ -+ int err; -+ -+ err = 0; -+ if (au_hnotify_op.init_br) -+ err = au_hnotify_op.init_br(br, perm); -+ -+ return err; -+} -+ -+void au_hnotify_fin_br(struct au_branch *br) -+{ -+ if (au_hnotify_op.fin_br) -+ au_hnotify_op.fin_br(br); -+} -+ -+static void au_hn_destroy_cache(void) -+{ -+ kmem_cache_destroy(au_cache[AuCache_HNOTIFY]); -+ au_cache[AuCache_HNOTIFY] = NULL; -+} -+ -+int __init au_hnotify_init(void) -+{ -+ int err; -+ -+ err = -ENOMEM; -+ au_cache[AuCache_HNOTIFY] = AuCache(au_hnotify); -+ if (au_cache[AuCache_HNOTIFY]) { -+ err = 0; -+ if (au_hnotify_op.init) -+ err = au_hnotify_op.init(); -+ if (unlikely(err)) -+ au_hn_destroy_cache(); -+ } -+ AuTraceErr(err); -+ return err; -+} -+ -+void au_hnotify_fin(void) -+{ -+ if (au_hnotify_op.fin) -+ au_hnotify_op.fin(); -+ -+ /* cf. au_cache_fin() */ -+ if (au_cache[AuCache_HNOTIFY]) -+ au_hn_destroy_cache(); -+} -diff --git a/fs/aufs/i_op.c b/fs/aufs/i_op.c -new file mode 100644 -index 000000000000..4f5001ebd0f4 ---- /dev/null -+++ b/fs/aufs/i_op.c -@@ -0,0 +1,1507 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * inode operations (except add/del/rename) -+ */ -+ -+#include <linux/device_cgroup.h> -+#include <linux/fs_stack.h> -+#include <linux/iversion.h> -+#include <linux/namei.h> -+#include <linux/security.h> -+#include "aufs.h" -+ -+static int h_permission(struct inode *h_inode, int mask, -+ struct path *h_path, int brperm) -+{ -+ int err; -+ const unsigned char write_mask = !!(mask & (MAY_WRITE | MAY_APPEND)); -+ -+ err = -EPERM; -+ if (write_mask && IS_IMMUTABLE(h_inode)) -+ goto out; -+ -+ err = -EACCES; -+ if (((mask & MAY_EXEC) -+ && S_ISREG(h_inode->i_mode) -+ && (path_noexec(h_path) -+ || !(h_inode->i_mode & 0111)))) -+ goto out; -+ -+ /* -+ * - skip the lower fs test in the case of write to ro branch. -+ * - nfs dir permission write check is optimized, but a policy for -+ * link/rename requires a real check. -+ * - nfs always sets SB_POSIXACL regardless its mount option 'noacl.' -+ * in this case, generic_permission() returns -EOPNOTSUPP. -+ */ -+ if ((write_mask && !au_br_writable(brperm)) -+ || (au_test_nfs(h_inode->i_sb) && S_ISDIR(h_inode->i_mode) -+ && write_mask && !(mask & MAY_READ)) -+ || !h_inode->i_op->permission) { -+ /* AuLabel(generic_permission); */ -+ /* AuDbg("get_acl %ps\n", h_inode->i_op->get_acl); */ -+ err = generic_permission(h_inode, mask); -+ if (err == -EOPNOTSUPP && au_test_nfs_noacl(h_inode)) -+ err = h_inode->i_op->permission(h_inode, mask); -+ AuTraceErr(err); -+ } else { -+ /* AuLabel(h_inode->permission); */ -+ err = h_inode->i_op->permission(h_inode, mask); -+ AuTraceErr(err); -+ } -+ -+ if (!err) -+ err = devcgroup_inode_permission(h_inode, mask); -+ if (!err) -+ err = security_inode_permission(h_inode, mask); -+ -+#if 0 -+ if (!err) { -+ /* todo: do we need to call ima_path_check()? */ -+ struct path h_path = { -+ .dentry = -+ .mnt = h_mnt -+ }; -+ err = ima_path_check(&h_path, -+ mask & (MAY_READ | MAY_WRITE | MAY_EXEC), -+ IMA_COUNT_LEAVE); -+ } -+#endif -+ -+out: -+ return err; -+} -+ -+static int aufs_permission(struct inode *inode, int mask) -+{ -+ int err; -+ aufs_bindex_t bindex, bbot; -+ const unsigned char isdir = !!S_ISDIR(inode->i_mode), -+ write_mask = !!(mask & (MAY_WRITE | MAY_APPEND)); -+ struct inode *h_inode; -+ struct super_block *sb; -+ struct au_branch *br; -+ -+ /* todo: support rcu-walk? */ -+ if (mask & MAY_NOT_BLOCK) -+ return -ECHILD; -+ -+ sb = inode->i_sb; -+ si_read_lock(sb, AuLock_FLUSH); -+ ii_read_lock_child(inode); -+#if 0 -+ err = au_iigen_test(inode, au_sigen(sb)); -+ if (unlikely(err)) -+ goto out; -+#endif -+ -+ if (!isdir -+ || write_mask -+ || au_opt_test(au_mntflags(sb), DIRPERM1)) { -+ err = au_busy_or_stale(); -+ h_inode = au_h_iptr(inode, au_ibtop(inode)); -+ if (unlikely(!h_inode -+ || (h_inode->i_mode & S_IFMT) -+ != (inode->i_mode & S_IFMT))) -+ goto out; -+ -+ err = 0; -+ bindex = au_ibtop(inode); -+ br = au_sbr(sb, bindex); -+ err = h_permission(h_inode, mask, &br->br_path, br->br_perm); -+ if (write_mask -+ && !err -+ && !special_file(h_inode->i_mode)) { -+ /* test whether the upper writable branch exists */ -+ err = -EROFS; -+ for (; bindex >= 0; bindex--) -+ if (!au_br_rdonly(au_sbr(sb, bindex))) { -+ err = 0; -+ break; -+ } -+ } -+ goto out; -+ } -+ -+ /* non-write to dir */ -+ err = 0; -+ bbot = au_ibbot(inode); -+ for (bindex = au_ibtop(inode); !err && bindex <= bbot; bindex++) { -+ h_inode = au_h_iptr(inode, bindex); -+ if (h_inode) { -+ err = au_busy_or_stale(); -+ if (unlikely(!S_ISDIR(h_inode->i_mode))) -+ break; -+ -+ br = au_sbr(sb, bindex); -+ err = h_permission(h_inode, mask, &br->br_path, -+ br->br_perm); -+ } -+ } -+ -+out: -+ ii_read_unlock(inode); -+ si_read_unlock(sb); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry, -+ unsigned int flags) -+{ -+ struct dentry *ret, *parent; -+ struct inode *inode; -+ struct super_block *sb; -+ int err, npositive; -+ -+ IMustLock(dir); -+ -+ /* todo: support rcu-walk? */ -+ ret = ERR_PTR(-ECHILD); -+ if (flags & LOOKUP_RCU) -+ goto out; -+ -+ ret = ERR_PTR(-ENAMETOOLONG); -+ if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) -+ goto out; -+ -+ sb = dir->i_sb; -+ err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); -+ ret = ERR_PTR(err); -+ if (unlikely(err)) -+ goto out; -+ -+ err = au_di_init(dentry); -+ ret = ERR_PTR(err); -+ if (unlikely(err)) -+ goto out_si; -+ -+ inode = NULL; -+ npositive = 0; /* suppress a warning */ -+ parent = dentry->d_parent; /* dir inode is locked */ -+ di_read_lock_parent(parent, AuLock_IR); -+ err = au_alive_dir(parent); -+ if (!err) -+ err = au_digen_test(parent, au_sigen(sb)); -+ if (!err) { -+ /* regardless LOOKUP_CREATE, always ALLOW_NEG */ -+ npositive = au_lkup_dentry(dentry, au_dbtop(parent), -+ AuLkup_ALLOW_NEG); -+ err = npositive; -+ } -+ di_read_unlock(parent, AuLock_IR); -+ ret = ERR_PTR(err); -+ if (unlikely(err < 0)) -+ goto out_unlock; -+ -+ if (npositive) { -+ inode = au_new_inode(dentry, /*must_new*/0); -+ if (IS_ERR(inode)) { -+ ret = (void *)inode; -+ inode = NULL; -+ goto out_unlock; -+ } -+ } -+ -+ if (inode) -+ atomic_inc(&inode->i_count); -+ ret = d_splice_alias(inode, dentry); -+#if 0 -+ if (unlikely(d_need_lookup(dentry))) { -+ spin_lock(&dentry->d_lock); -+ dentry->d_flags &= ~DCACHE_NEED_LOOKUP; -+ spin_unlock(&dentry->d_lock); -+ } else -+#endif -+ if (inode) { -+ if (!IS_ERR(ret)) { -+ iput(inode); -+ if (ret && ret != dentry) -+ ii_write_unlock(inode); -+ } else { -+ ii_write_unlock(inode); -+ iput(inode); -+ inode = NULL; -+ } -+ } -+ -+out_unlock: -+ di_write_unlock(dentry); -+out_si: -+ si_read_unlock(sb); -+out: -+ return ret; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * very dirty and complicated aufs ->atomic_open(). -+ * aufs_atomic_open() -+ * + au_aopen_or_create() -+ * + add_simple() -+ * + vfsub_atomic_open() -+ * + branch fs ->atomic_open() -+ * may call the actual 'open' for h_file -+ * + inc br_nfiles only if opened -+ * + au_aopen_no_open() or au_aopen_do_open() -+ * -+ * au_aopen_do_open() -+ * + finish_open() -+ * + au_do_aopen() -+ * + au_do_open() the body of all 'open' -+ * + au_do_open_nondir() -+ * set the passed h_file -+ * -+ * au_aopen_no_open() -+ * + finish_no_open() -+ */ -+ -+struct aopen_node { -+ struct hlist_bl_node hblist; -+ struct file *file, *h_file; -+}; -+ -+static int au_do_aopen(struct inode *inode, struct file *file) -+{ -+ struct hlist_bl_head *aopen; -+ struct hlist_bl_node *pos; -+ struct aopen_node *node; -+ struct au_do_open_args args = { -+ .aopen = 1, -+ .open = au_do_open_nondir -+ }; -+ -+ aopen = &au_sbi(inode->i_sb)->si_aopen; -+ hlist_bl_lock(aopen); -+ hlist_bl_for_each_entry(node, pos, aopen, hblist) -+ if (node->file == file) { -+ args.h_file = node->h_file; -+ break; -+ } -+ hlist_bl_unlock(aopen); -+ /* AuDebugOn(!args.h_file); */ -+ -+ return au_do_open(file, &args); -+} -+ -+static int au_aopen_do_open(struct file *file, struct dentry *dentry, -+ struct aopen_node *aopen_node) -+{ -+ int err; -+ struct hlist_bl_head *aopen; -+ -+ AuLabel(here); -+ aopen = &au_sbi(dentry->d_sb)->si_aopen; -+ au_hbl_add(&aopen_node->hblist, aopen); -+ err = finish_open(file, dentry, au_do_aopen); -+ au_hbl_del(&aopen_node->hblist, aopen); -+ /* AuDbgFile(file); */ -+ AuDbg("%pd%s%s\n", dentry, -+ (file->f_mode & FMODE_CREATED) ? " created" : "", -+ (file->f_mode & FMODE_OPENED) ? " opened" : ""); -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+static int au_aopen_no_open(struct file *file, struct dentry *dentry) -+{ -+ int err; -+ -+ AuLabel(here); -+ dget(dentry); -+ err = finish_no_open(file, dentry); -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+static int aufs_atomic_open(struct inode *dir, struct dentry *dentry, -+ struct file *file, unsigned int open_flag, -+ umode_t create_mode) -+{ -+ int err, did_open; -+ unsigned int lkup_flags; -+ aufs_bindex_t bindex; -+ struct super_block *sb; -+ struct dentry *parent, *d; -+ struct vfsub_aopen_args args = { -+ .open_flag = open_flag, -+ .create_mode = create_mode -+ }; -+ struct aopen_node aopen_node = { -+ .file = file -+ }; -+ -+ IMustLock(dir); -+ AuDbg("open_flag 0%o\n", open_flag); -+ AuDbgDentry(dentry); -+ -+ err = 0; -+ if (!au_di(dentry)) { -+ lkup_flags = LOOKUP_OPEN; -+ if (open_flag & O_CREAT) -+ lkup_flags |= LOOKUP_CREATE; -+ d = aufs_lookup(dir, dentry, lkup_flags); -+ if (IS_ERR(d)) { -+ err = PTR_ERR(d); -+ AuTraceErr(err); -+ goto out; -+ } else if (d) { -+ /* -+ * obsoleted dentry found. -+ * another error will be returned later. -+ */ -+ d_drop(d); -+ AuDbgDentry(d); -+ dput(d); -+ } -+ AuDbgDentry(dentry); -+ } -+ -+ if (d_is_positive(dentry) -+ || d_unhashed(dentry) -+ || d_unlinked(dentry) -+ || !(open_flag & O_CREAT)) { -+ err = au_aopen_no_open(file, dentry); -+ goto out; /* success */ -+ } -+ -+ err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN); -+ if (unlikely(err)) -+ goto out; -+ -+ sb = dentry->d_sb; -+ parent = dentry->d_parent; /* dir is locked */ -+ di_write_lock_parent(parent); -+ err = au_lkup_dentry(dentry, /*btop*/0, AuLkup_ALLOW_NEG); -+ if (unlikely(err < 0)) -+ goto out_parent; -+ -+ AuDbgDentry(dentry); -+ if (d_is_positive(dentry)) { -+ err = au_aopen_no_open(file, dentry); -+ goto out_parent; /* success */ -+ } -+ -+ args.file = alloc_empty_file(file->f_flags, current_cred()); -+ err = PTR_ERR(args.file); -+ if (IS_ERR(args.file)) -+ goto out_parent; -+ -+ bindex = au_dbtop(dentry); -+ err = au_aopen_or_create(dir, dentry, &args); -+ AuTraceErr(err); -+ AuDbgFile(args.file); -+ file->f_mode = args.file->f_mode & ~FMODE_OPENED; -+ did_open = !!(args.file->f_mode & FMODE_OPENED); -+ if (!did_open) { -+ fput(args.file); -+ args.file = NULL; -+ } -+ di_write_unlock(parent); -+ di_write_unlock(dentry); -+ if (unlikely(err < 0)) { -+ if (args.file) -+ fput(args.file); -+ goto out_sb; -+ } -+ -+ if (!did_open) -+ err = au_aopen_no_open(file, dentry); -+ else { -+ aopen_node.h_file = args.file; -+ err = au_aopen_do_open(file, dentry, &aopen_node); -+ } -+ if (unlikely(err < 0)) { -+ if (args.file) -+ fput(args.file); -+ if (did_open) -+ au_lcnt_dec(&args.br->br_nfiles); -+ } -+ goto out_sb; /* success */ -+ -+out_parent: -+ di_write_unlock(parent); -+ di_write_unlock(dentry); -+out_sb: -+ si_read_unlock(sb); -+out: -+ AuTraceErr(err); -+ AuDbgFile(file); -+ return err; -+} -+ -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_wr_dir_cpup(struct dentry *dentry, struct dentry *parent, -+ const unsigned char add_entry, aufs_bindex_t bcpup, -+ aufs_bindex_t btop) -+{ -+ int err; -+ struct dentry *h_parent; -+ struct inode *h_dir; -+ -+ if (add_entry) -+ IMustLock(d_inode(parent)); -+ else -+ di_write_lock_parent(parent); -+ -+ err = 0; -+ if (!au_h_dptr(parent, bcpup)) { -+ if (btop > bcpup) -+ err = au_cpup_dirs(dentry, bcpup); -+ else if (btop < bcpup) -+ err = au_cpdown_dirs(dentry, bcpup); -+ else -+ BUG(); -+ } -+ if (!err && add_entry && !au_ftest_wrdir(add_entry, TMPFILE)) { -+ h_parent = au_h_dptr(parent, bcpup); -+ h_dir = d_inode(h_parent); -+ inode_lock_shared_nested(h_dir, AuLsc_I_PARENT); -+ err = au_lkup_neg(dentry, bcpup, /*wh*/0); -+ /* todo: no unlock here */ -+ inode_unlock_shared(h_dir); -+ -+ AuDbg("bcpup %d\n", bcpup); -+ if (!err) { -+ if (d_really_is_negative(dentry)) -+ au_set_h_dptr(dentry, btop, NULL); -+ au_update_dbrange(dentry, /*do_put_zero*/0); -+ } -+ } -+ -+ if (!add_entry) -+ di_write_unlock(parent); -+ if (!err) -+ err = bcpup; /* success */ -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+/* -+ * decide the branch and the parent dir where we will create a new entry. -+ * returns new bindex or an error. -+ * copyup the parent dir if needed. -+ */ -+int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry, -+ struct au_wr_dir_args *args) -+{ -+ int err; -+ unsigned int flags; -+ aufs_bindex_t bcpup, btop, src_btop; -+ const unsigned char add_entry -+ = au_ftest_wrdir(args->flags, ADD_ENTRY) -+ | au_ftest_wrdir(args->flags, TMPFILE); -+ struct super_block *sb; -+ struct dentry *parent; -+ struct au_sbinfo *sbinfo; -+ -+ sb = dentry->d_sb; -+ sbinfo = au_sbi(sb); -+ parent = dget_parent(dentry); -+ btop = au_dbtop(dentry); -+ bcpup = btop; -+ if (args->force_btgt < 0) { -+ if (src_dentry) { -+ src_btop = au_dbtop(src_dentry); -+ if (src_btop < btop) -+ bcpup = src_btop; -+ } else if (add_entry) { -+ flags = 0; -+ if (au_ftest_wrdir(args->flags, ISDIR)) -+ au_fset_wbr(flags, DIR); -+ err = AuWbrCreate(sbinfo, dentry, flags); -+ bcpup = err; -+ } -+ -+ if (bcpup < 0 || au_test_ro(sb, bcpup, d_inode(dentry))) { -+ if (add_entry) -+ err = AuWbrCopyup(sbinfo, dentry); -+ else { -+ if (!IS_ROOT(dentry)) { -+ di_read_lock_parent(parent, !AuLock_IR); -+ err = AuWbrCopyup(sbinfo, dentry); -+ di_read_unlock(parent, !AuLock_IR); -+ } else -+ err = AuWbrCopyup(sbinfo, dentry); -+ } -+ bcpup = err; -+ if (unlikely(err < 0)) -+ goto out; -+ } -+ } else { -+ bcpup = args->force_btgt; -+ AuDebugOn(au_test_ro(sb, bcpup, d_inode(dentry))); -+ } -+ -+ AuDbg("btop %d, bcpup %d\n", btop, bcpup); -+ err = bcpup; -+ if (bcpup == btop) -+ goto out; /* success */ -+ -+ /* copyup the new parent into the branch we process */ -+ err = au_wr_dir_cpup(dentry, parent, add_entry, bcpup, btop); -+ if (err >= 0) { -+ if (d_really_is_negative(dentry)) { -+ au_set_h_dptr(dentry, btop, NULL); -+ au_set_dbtop(dentry, bcpup); -+ au_set_dbbot(dentry, bcpup); -+ } -+ AuDebugOn(add_entry -+ && !au_ftest_wrdir(args->flags, TMPFILE) -+ && !au_h_dptr(dentry, bcpup)); -+ } -+ -+out: -+ dput(parent); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+void au_pin_hdir_unlock(struct au_pin *p) -+{ -+ if (p->hdir) -+ au_hn_inode_unlock(p->hdir); -+} -+ -+int au_pin_hdir_lock(struct au_pin *p) -+{ -+ int err; -+ -+ err = 0; -+ if (!p->hdir) -+ goto out; -+ -+ /* even if an error happens later, keep this lock */ -+ au_hn_inode_lock_nested(p->hdir, p->lsc_hi); -+ -+ err = -EBUSY; -+ if (unlikely(p->hdir->hi_inode != d_inode(p->h_parent))) -+ goto out; -+ -+ err = 0; -+ if (p->h_dentry) -+ err = au_h_verify(p->h_dentry, p->udba, p->hdir->hi_inode, -+ p->h_parent, p->br); -+ -+out: -+ return err; -+} -+ -+int au_pin_hdir_relock(struct au_pin *p) -+{ -+ int err, i; -+ struct inode *h_i; -+ struct dentry *h_d[] = { -+ p->h_dentry, -+ p->h_parent -+ }; -+ -+ err = au_pin_hdir_lock(p); -+ if (unlikely(err)) -+ goto out; -+ -+ for (i = 0; !err && i < sizeof(h_d)/sizeof(*h_d); i++) { -+ if (!h_d[i]) -+ continue; -+ if (d_is_positive(h_d[i])) { -+ h_i = d_inode(h_d[i]); -+ err = !h_i->i_nlink; -+ } -+ } -+ -+out: -+ return err; -+} -+ -+static void au_pin_hdir_set_owner(struct au_pin *p, struct task_struct *task) -+{ -+#if !defined(CONFIG_RWSEM_GENERIC_SPINLOCK) && defined(CONFIG_RWSEM_SPIN_ON_OWNER) -+ p->hdir->hi_inode->i_rwsem.owner = task; -+#endif -+} -+ -+void au_pin_hdir_acquire_nest(struct au_pin *p) -+{ -+ if (p->hdir) { -+ rwsem_acquire_nest(&p->hdir->hi_inode->i_rwsem.dep_map, -+ p->lsc_hi, 0, NULL, _RET_IP_); -+ au_pin_hdir_set_owner(p, current); -+ } -+} -+ -+void au_pin_hdir_release(struct au_pin *p) -+{ -+ if (p->hdir) { -+ au_pin_hdir_set_owner(p, p->task); -+ rwsem_release(&p->hdir->hi_inode->i_rwsem.dep_map, 1, _RET_IP_); -+ } -+} -+ -+struct dentry *au_pinned_h_parent(struct au_pin *pin) -+{ -+ if (pin && pin->parent) -+ return au_h_dptr(pin->parent, pin->bindex); -+ return NULL; -+} -+ -+void au_unpin(struct au_pin *p) -+{ -+ if (p->hdir) -+ au_pin_hdir_unlock(p); -+ if (p->h_mnt && au_ftest_pin(p->flags, MNT_WRITE)) -+ vfsub_mnt_drop_write(p->h_mnt); -+ if (!p->hdir) -+ return; -+ -+ if (!au_ftest_pin(p->flags, DI_LOCKED)) -+ di_read_unlock(p->parent, AuLock_IR); -+ iput(p->hdir->hi_inode); -+ dput(p->parent); -+ p->parent = NULL; -+ p->hdir = NULL; -+ p->h_mnt = NULL; -+ /* do not clear p->task */ -+} -+ -+int au_do_pin(struct au_pin *p) -+{ -+ int err; -+ struct super_block *sb; -+ struct inode *h_dir; -+ -+ err = 0; -+ sb = p->dentry->d_sb; -+ p->br = au_sbr(sb, p->bindex); -+ if (IS_ROOT(p->dentry)) { -+ if (au_ftest_pin(p->flags, MNT_WRITE)) { -+ p->h_mnt = au_br_mnt(p->br); -+ err = vfsub_mnt_want_write(p->h_mnt); -+ if (unlikely(err)) { -+ au_fclr_pin(p->flags, MNT_WRITE); -+ goto out_err; -+ } -+ } -+ goto out; -+ } -+ -+ p->h_dentry = NULL; -+ if (p->bindex <= au_dbbot(p->dentry)) -+ p->h_dentry = au_h_dptr(p->dentry, p->bindex); -+ -+ p->parent = dget_parent(p->dentry); -+ if (!au_ftest_pin(p->flags, DI_LOCKED)) -+ di_read_lock(p->parent, AuLock_IR, p->lsc_di); -+ -+ h_dir = NULL; -+ p->h_parent = au_h_dptr(p->parent, p->bindex); -+ p->hdir = au_hi(d_inode(p->parent), p->bindex); -+ if (p->hdir) -+ h_dir = p->hdir->hi_inode; -+ -+ /* -+ * udba case, or -+ * if DI_LOCKED is not set, then p->parent may be different -+ * and h_parent can be NULL. -+ */ -+ if (unlikely(!p->hdir || !h_dir || !p->h_parent)) { -+ err = -EBUSY; -+ if (!au_ftest_pin(p->flags, DI_LOCKED)) -+ di_read_unlock(p->parent, AuLock_IR); -+ dput(p->parent); -+ p->parent = NULL; -+ goto out_err; -+ } -+ -+ if (au_ftest_pin(p->flags, MNT_WRITE)) { -+ p->h_mnt = au_br_mnt(p->br); -+ err = vfsub_mnt_want_write(p->h_mnt); -+ if (unlikely(err)) { -+ au_fclr_pin(p->flags, MNT_WRITE); -+ if (!au_ftest_pin(p->flags, DI_LOCKED)) -+ di_read_unlock(p->parent, AuLock_IR); -+ dput(p->parent); -+ p->parent = NULL; -+ goto out_err; -+ } -+ } -+ -+ au_igrab(h_dir); -+ err = au_pin_hdir_lock(p); -+ if (!err) -+ goto out; /* success */ -+ -+ au_unpin(p); -+ -+out_err: -+ pr_err("err %d\n", err); -+ err = au_busy_or_stale(); -+out: -+ return err; -+} -+ -+void au_pin_init(struct au_pin *p, struct dentry *dentry, -+ aufs_bindex_t bindex, int lsc_di, int lsc_hi, -+ unsigned int udba, unsigned char flags) -+{ -+ p->dentry = dentry; -+ p->udba = udba; -+ p->lsc_di = lsc_di; -+ p->lsc_hi = lsc_hi; -+ p->flags = flags; -+ p->bindex = bindex; -+ -+ p->parent = NULL; -+ p->hdir = NULL; -+ p->h_mnt = NULL; -+ -+ p->h_dentry = NULL; -+ p->h_parent = NULL; -+ p->br = NULL; -+ p->task = current; -+} -+ -+int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex, -+ unsigned int udba, unsigned char flags) -+{ -+ au_pin_init(pin, dentry, bindex, AuLsc_DI_PARENT, AuLsc_I_PARENT2, -+ udba, flags); -+ return au_do_pin(pin); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * ->setattr() and ->getattr() are called in various cases. -+ * chmod, stat: dentry is revalidated. -+ * fchmod, fstat: file and dentry are not revalidated, additionally they may be -+ * unhashed. -+ * for ->setattr(), ia->ia_file is passed from ftruncate only. -+ */ -+/* todo: consolidate with do_refresh() and simple_reval_dpath() */ -+int au_reval_for_attr(struct dentry *dentry, unsigned int sigen) -+{ -+ int err; -+ struct dentry *parent; -+ -+ err = 0; -+ if (au_digen_test(dentry, sigen)) { -+ parent = dget_parent(dentry); -+ di_read_lock_parent(parent, AuLock_IR); -+ err = au_refresh_dentry(dentry, parent); -+ di_read_unlock(parent, AuLock_IR); -+ dput(parent); -+ } -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia, -+ struct au_icpup_args *a) -+{ -+ int err; -+ loff_t sz; -+ aufs_bindex_t btop, ibtop; -+ struct dentry *hi_wh, *parent; -+ struct inode *inode; -+ struct au_wr_dir_args wr_dir_args = { -+ .force_btgt = -1, -+ .flags = 0 -+ }; -+ -+ if (d_is_dir(dentry)) -+ au_fset_wrdir(wr_dir_args.flags, ISDIR); -+ /* plink or hi_wh() case */ -+ btop = au_dbtop(dentry); -+ inode = d_inode(dentry); -+ ibtop = au_ibtop(inode); -+ if (btop != ibtop && !au_test_ro(inode->i_sb, ibtop, inode)) -+ wr_dir_args.force_btgt = ibtop; -+ err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args); -+ if (unlikely(err < 0)) -+ goto out; -+ a->btgt = err; -+ if (err != btop) -+ au_fset_icpup(a->flags, DID_CPUP); -+ -+ err = 0; -+ a->pin_flags = AuPin_MNT_WRITE; -+ parent = NULL; -+ if (!IS_ROOT(dentry)) { -+ au_fset_pin(a->pin_flags, DI_LOCKED); -+ parent = dget_parent(dentry); -+ di_write_lock_parent(parent); -+ } -+ -+ err = au_pin(&a->pin, dentry, a->btgt, a->udba, a->pin_flags); -+ if (unlikely(err)) -+ goto out_parent; -+ -+ sz = -1; -+ a->h_path.dentry = au_h_dptr(dentry, btop); -+ a->h_inode = d_inode(a->h_path.dentry); -+ if (ia && (ia->ia_valid & ATTR_SIZE)) { -+ inode_lock_shared_nested(a->h_inode, AuLsc_I_CHILD); -+ if (ia->ia_size < i_size_read(a->h_inode)) -+ sz = ia->ia_size; -+ inode_unlock_shared(a->h_inode); -+ } -+ -+ hi_wh = NULL; -+ if (au_ftest_icpup(a->flags, DID_CPUP) && d_unlinked(dentry)) { -+ hi_wh = au_hi_wh(inode, a->btgt); -+ if (!hi_wh) { -+ struct au_cp_generic cpg = { -+ .dentry = dentry, -+ .bdst = a->btgt, -+ .bsrc = -1, -+ .len = sz, -+ .pin = &a->pin -+ }; -+ err = au_sio_cpup_wh(&cpg, /*file*/NULL); -+ if (unlikely(err)) -+ goto out_unlock; -+ hi_wh = au_hi_wh(inode, a->btgt); -+ /* todo: revalidate hi_wh? */ -+ } -+ } -+ -+ if (parent) { -+ au_pin_set_parent_lflag(&a->pin, /*lflag*/0); -+ di_downgrade_lock(parent, AuLock_IR); -+ dput(parent); -+ parent = NULL; -+ } -+ if (!au_ftest_icpup(a->flags, DID_CPUP)) -+ goto out; /* success */ -+ -+ if (!d_unhashed(dentry)) { -+ struct au_cp_generic cpg = { -+ .dentry = dentry, -+ .bdst = a->btgt, -+ .bsrc = btop, -+ .len = sz, -+ .pin = &a->pin, -+ .flags = AuCpup_DTIME | AuCpup_HOPEN -+ }; -+ err = au_sio_cpup_simple(&cpg); -+ if (!err) -+ a->h_path.dentry = au_h_dptr(dentry, a->btgt); -+ } else if (!hi_wh) -+ a->h_path.dentry = au_h_dptr(dentry, a->btgt); -+ else -+ a->h_path.dentry = hi_wh; /* do not dget here */ -+ -+out_unlock: -+ a->h_inode = d_inode(a->h_path.dentry); -+ if (!err) -+ goto out; /* success */ -+ au_unpin(&a->pin); -+out_parent: -+ if (parent) { -+ di_write_unlock(parent); -+ dput(parent); -+ } -+out: -+ if (!err) -+ inode_lock_nested(a->h_inode, AuLsc_I_CHILD); -+ return err; -+} -+ -+static int aufs_setattr(struct dentry *dentry, struct iattr *ia) -+{ -+ int err; -+ struct inode *inode, *delegated; -+ struct super_block *sb; -+ struct file *file; -+ struct au_icpup_args *a; -+ -+ inode = d_inode(dentry); -+ IMustLock(inode); -+ -+ err = setattr_prepare(dentry, ia); -+ if (unlikely(err)) -+ goto out; -+ -+ err = -ENOMEM; -+ a = kzalloc(sizeof(*a), GFP_NOFS); -+ if (unlikely(!a)) -+ goto out; -+ -+ if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) -+ ia->ia_valid &= ~ATTR_MODE; -+ -+ file = NULL; -+ sb = dentry->d_sb; -+ err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); -+ if (unlikely(err)) -+ goto out_kfree; -+ -+ if (ia->ia_valid & ATTR_FILE) { -+ /* currently ftruncate(2) only */ -+ AuDebugOn(!d_is_reg(dentry)); -+ file = ia->ia_file; -+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1, -+ /*fi_lsc*/0); -+ if (unlikely(err)) -+ goto out_si; -+ ia->ia_file = au_hf_top(file); -+ a->udba = AuOpt_UDBA_NONE; -+ } else { -+ /* fchmod() doesn't pass ia_file */ -+ a->udba = au_opt_udba(sb); -+ di_write_lock_child(dentry); -+ /* no d_unlinked(), to set UDBA_NONE for root */ -+ if (d_unhashed(dentry)) -+ a->udba = AuOpt_UDBA_NONE; -+ if (a->udba != AuOpt_UDBA_NONE) { -+ AuDebugOn(IS_ROOT(dentry)); -+ err = au_reval_for_attr(dentry, au_sigen(sb)); -+ if (unlikely(err)) -+ goto out_dentry; -+ } -+ } -+ -+ err = au_pin_and_icpup(dentry, ia, a); -+ if (unlikely(err < 0)) -+ goto out_dentry; -+ if (au_ftest_icpup(a->flags, DID_CPUP)) { -+ ia->ia_file = NULL; -+ ia->ia_valid &= ~ATTR_FILE; -+ } -+ -+ a->h_path.mnt = au_sbr_mnt(sb, a->btgt); -+ if ((ia->ia_valid & (ATTR_MODE | ATTR_CTIME)) -+ == (ATTR_MODE | ATTR_CTIME)) { -+ err = security_path_chmod(&a->h_path, ia->ia_mode); -+ if (unlikely(err)) -+ goto out_unlock; -+ } else if ((ia->ia_valid & (ATTR_UID | ATTR_GID)) -+ && (ia->ia_valid & ATTR_CTIME)) { -+ err = security_path_chown(&a->h_path, ia->ia_uid, ia->ia_gid); -+ if (unlikely(err)) -+ goto out_unlock; -+ } -+ -+ if (ia->ia_valid & ATTR_SIZE) { -+ struct file *f; -+ -+ if (ia->ia_size < i_size_read(inode)) -+ /* unmap only */ -+ truncate_setsize(inode, ia->ia_size); -+ -+ f = NULL; -+ if (ia->ia_valid & ATTR_FILE) -+ f = ia->ia_file; -+ inode_unlock(a->h_inode); -+ err = vfsub_trunc(&a->h_path, ia->ia_size, ia->ia_valid, f); -+ inode_lock_nested(a->h_inode, AuLsc_I_CHILD); -+ } else { -+ delegated = NULL; -+ while (1) { -+ err = vfsub_notify_change(&a->h_path, ia, &delegated); -+ if (delegated) { -+ err = break_deleg_wait(&delegated); -+ if (!err) -+ continue; -+ } -+ break; -+ } -+ } -+ /* -+ * regardless aufs 'acl' option setting. -+ * why don't all acl-aware fs call this func from their ->setattr()? -+ */ -+ if (!err && (ia->ia_valid & ATTR_MODE)) -+ err = vfsub_acl_chmod(a->h_inode, ia->ia_mode); -+ if (!err) -+ au_cpup_attr_changeable(inode); -+ -+out_unlock: -+ inode_unlock(a->h_inode); -+ au_unpin(&a->pin); -+ if (unlikely(err)) -+ au_update_dbtop(dentry); -+out_dentry: -+ di_write_unlock(dentry); -+ if (file) { -+ fi_write_unlock(file); -+ ia->ia_file = file; -+ ia->ia_valid |= ATTR_FILE; -+ } -+out_si: -+ si_read_unlock(sb); -+out_kfree: -+ au_kfree_rcu(a); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+#if IS_ENABLED(CONFIG_AUFS_XATTR) || IS_ENABLED(CONFIG_FS_POSIX_ACL) -+static int au_h_path_to_set_attr(struct dentry *dentry, -+ struct au_icpup_args *a, struct path *h_path) -+{ -+ int err; -+ struct super_block *sb; -+ -+ sb = dentry->d_sb; -+ a->udba = au_opt_udba(sb); -+ /* no d_unlinked(), to set UDBA_NONE for root */ -+ if (d_unhashed(dentry)) -+ a->udba = AuOpt_UDBA_NONE; -+ if (a->udba != AuOpt_UDBA_NONE) { -+ AuDebugOn(IS_ROOT(dentry)); -+ err = au_reval_for_attr(dentry, au_sigen(sb)); -+ if (unlikely(err)) -+ goto out; -+ } -+ err = au_pin_and_icpup(dentry, /*ia*/NULL, a); -+ if (unlikely(err < 0)) -+ goto out; -+ -+ h_path->dentry = a->h_path.dentry; -+ h_path->mnt = au_sbr_mnt(sb, a->btgt); -+ -+out: -+ return err; -+} -+ -+ssize_t au_sxattr(struct dentry *dentry, struct inode *inode, -+ struct au_sxattr *arg) -+{ -+ int err; -+ struct path h_path; -+ struct super_block *sb; -+ struct au_icpup_args *a; -+ struct inode *h_inode; -+ -+ IMustLock(inode); -+ -+ err = -ENOMEM; -+ a = kzalloc(sizeof(*a), GFP_NOFS); -+ if (unlikely(!a)) -+ goto out; -+ -+ sb = dentry->d_sb; -+ err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); -+ if (unlikely(err)) -+ goto out_kfree; -+ -+ h_path.dentry = NULL; /* silence gcc */ -+ di_write_lock_child(dentry); -+ err = au_h_path_to_set_attr(dentry, a, &h_path); -+ if (unlikely(err)) -+ goto out_di; -+ -+ inode_unlock(a->h_inode); -+ switch (arg->type) { -+ case AU_XATTR_SET: -+ AuDebugOn(d_is_negative(h_path.dentry)); -+ err = vfsub_setxattr(h_path.dentry, -+ arg->u.set.name, arg->u.set.value, -+ arg->u.set.size, arg->u.set.flags); -+ break; -+ case AU_ACL_SET: -+ err = -EOPNOTSUPP; -+ h_inode = d_inode(h_path.dentry); -+ if (h_inode->i_op->set_acl) -+ /* this will call posix_acl_update_mode */ -+ err = h_inode->i_op->set_acl(h_inode, -+ arg->u.acl_set.acl, -+ arg->u.acl_set.type); -+ break; -+ } -+ if (!err) -+ au_cpup_attr_timesizes(inode); -+ -+ au_unpin(&a->pin); -+ if (unlikely(err)) -+ au_update_dbtop(dentry); -+ -+out_di: -+ di_write_unlock(dentry); -+ si_read_unlock(sb); -+out_kfree: -+ au_kfree_rcu(a); -+out: -+ AuTraceErr(err); -+ return err; -+} -+#endif -+ -+static void au_refresh_iattr(struct inode *inode, struct kstat *st, -+ unsigned int nlink) -+{ -+ unsigned int n; -+ -+ inode->i_mode = st->mode; -+ /* don't i_[ug]id_write() here */ -+ inode->i_uid = st->uid; -+ inode->i_gid = st->gid; -+ inode->i_atime = st->atime; -+ inode->i_mtime = st->mtime; -+ inode->i_ctime = st->ctime; -+ -+ au_cpup_attr_nlink(inode, /*force*/0); -+ if (S_ISDIR(inode->i_mode)) { -+ n = inode->i_nlink; -+ n -= nlink; -+ n += st->nlink; -+ smp_mb(); /* for i_nlink */ -+ /* 0 can happen */ -+ set_nlink(inode, n); -+ } -+ -+ spin_lock(&inode->i_lock); -+ inode->i_blocks = st->blocks; -+ i_size_write(inode, st->size); -+ spin_unlock(&inode->i_lock); -+} -+ -+/* -+ * common routine for aufs_getattr() and au_getxattr(). -+ * returns zero or negative (an error). -+ * @dentry will be read-locked in success. -+ */ -+int au_h_path_getattr(struct dentry *dentry, int force, struct path *h_path, -+ int locked) -+{ -+ int err; -+ unsigned int mnt_flags, sigen; -+ unsigned char udba_none; -+ aufs_bindex_t bindex; -+ struct super_block *sb, *h_sb; -+ struct inode *inode; -+ -+ h_path->mnt = NULL; -+ h_path->dentry = NULL; -+ -+ err = 0; -+ sb = dentry->d_sb; -+ mnt_flags = au_mntflags(sb); -+ udba_none = !!au_opt_test(mnt_flags, UDBA_NONE); -+ -+ if (unlikely(locked)) -+ goto body; /* skip locking dinfo */ -+ -+ /* support fstat(2) */ -+ if (!d_unlinked(dentry) && !udba_none) { -+ sigen = au_sigen(sb); -+ err = au_digen_test(dentry, sigen); -+ if (!err) { -+ di_read_lock_child(dentry, AuLock_IR); -+ err = au_dbrange_test(dentry); -+ if (unlikely(err)) { -+ di_read_unlock(dentry, AuLock_IR); -+ goto out; -+ } -+ } else { -+ AuDebugOn(IS_ROOT(dentry)); -+ di_write_lock_child(dentry); -+ err = au_dbrange_test(dentry); -+ if (!err) -+ err = au_reval_for_attr(dentry, sigen); -+ if (!err) -+ di_downgrade_lock(dentry, AuLock_IR); -+ else { -+ di_write_unlock(dentry); -+ goto out; -+ } -+ } -+ } else -+ di_read_lock_child(dentry, AuLock_IR); -+ -+body: -+ inode = d_inode(dentry); -+ bindex = au_ibtop(inode); -+ h_path->mnt = au_sbr_mnt(sb, bindex); -+ h_sb = h_path->mnt->mnt_sb; -+ if (!force -+ && !au_test_fs_bad_iattr(h_sb) -+ && udba_none) -+ goto out; /* success */ -+ -+ if (au_dbtop(dentry) == bindex) -+ h_path->dentry = au_h_dptr(dentry, bindex); -+ else if (au_opt_test(mnt_flags, PLINK) && au_plink_test(inode)) { -+ h_path->dentry = au_plink_lkup(inode, bindex); -+ if (IS_ERR(h_path->dentry)) -+ /* pretending success */ -+ h_path->dentry = NULL; -+ else -+ dput(h_path->dentry); -+ } -+ -+out: -+ return err; -+} -+ -+static int aufs_getattr(const struct path *path, struct kstat *st, -+ u32 request, unsigned int query) -+{ -+ int err; -+ unsigned char positive; -+ struct path h_path; -+ struct dentry *dentry; -+ struct inode *inode; -+ struct super_block *sb; -+ -+ dentry = path->dentry; -+ inode = d_inode(dentry); -+ sb = dentry->d_sb; -+ err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); -+ if (unlikely(err)) -+ goto out; -+ err = au_h_path_getattr(dentry, /*force*/0, &h_path, /*locked*/0); -+ if (unlikely(err)) -+ goto out_si; -+ if (unlikely(!h_path.dentry)) -+ /* illegally overlapped or something */ -+ goto out_fill; /* pretending success */ -+ -+ positive = d_is_positive(h_path.dentry); -+ if (positive) -+ /* no vfsub version */ -+ err = vfs_getattr(&h_path, st, request, query); -+ if (!err) { -+ if (positive) -+ au_refresh_iattr(inode, st, -+ d_inode(h_path.dentry)->i_nlink); -+ goto out_fill; /* success */ -+ } -+ AuTraceErr(err); -+ goto out_di; -+ -+out_fill: -+ generic_fillattr(inode, st); -+out_di: -+ di_read_unlock(dentry, AuLock_IR); -+out_si: -+ si_read_unlock(sb); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static const char *aufs_get_link(struct dentry *dentry, struct inode *inode, -+ struct delayed_call *done) -+{ -+ const char *ret; -+ struct dentry *h_dentry; -+ struct inode *h_inode; -+ int err; -+ aufs_bindex_t bindex; -+ -+ ret = NULL; /* suppress a warning */ -+ err = -ECHILD; -+ if (!dentry) -+ goto out; -+ -+ err = aufs_read_lock(dentry, AuLock_IR | AuLock_GEN); -+ if (unlikely(err)) -+ goto out; -+ -+ err = au_d_hashed_positive(dentry); -+ if (unlikely(err)) -+ goto out_unlock; -+ -+ err = -EINVAL; -+ inode = d_inode(dentry); -+ bindex = au_ibtop(inode); -+ h_inode = au_h_iptr(inode, bindex); -+ if (unlikely(!h_inode->i_op->get_link)) -+ goto out_unlock; -+ -+ err = -EBUSY; -+ h_dentry = NULL; -+ if (au_dbtop(dentry) <= bindex) { -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (h_dentry) -+ dget(h_dentry); -+ } -+ if (!h_dentry) { -+ h_dentry = d_find_any_alias(h_inode); -+ if (IS_ERR(h_dentry)) { -+ err = PTR_ERR(h_dentry); -+ goto out_unlock; -+ } -+ } -+ if (unlikely(!h_dentry)) -+ goto out_unlock; -+ -+ err = 0; -+ AuDbg("%ps\n", h_inode->i_op->get_link); -+ AuDbgDentry(h_dentry); -+ ret = vfs_get_link(h_dentry, done); -+ dput(h_dentry); -+ if (IS_ERR(ret)) -+ err = PTR_ERR(ret); -+ -+out_unlock: -+ aufs_read_unlock(dentry, AuLock_IR); -+out: -+ if (unlikely(err)) -+ ret = ERR_PTR(err); -+ AuTraceErrPtr(ret); -+ return ret; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_is_special(struct inode *inode) -+{ -+ return (inode->i_mode & (S_IFBLK | S_IFCHR | S_IFIFO | S_IFSOCK)); -+} -+ -+static int aufs_update_time(struct inode *inode, struct timespec64 *ts, -+ int flags) -+{ -+ int err; -+ aufs_bindex_t bindex; -+ struct super_block *sb; -+ struct inode *h_inode; -+ struct vfsmount *h_mnt; -+ -+ sb = inode->i_sb; -+ WARN_ONCE((flags & S_ATIME) && !IS_NOATIME(inode), -+ "unexpected s_flags 0x%lx", sb->s_flags); -+ -+ /* mmap_sem might be acquired already, cf. aufs_mmap() */ -+ lockdep_off(); -+ si_read_lock(sb, AuLock_FLUSH); -+ ii_write_lock_child(inode); -+ -+ err = 0; -+ bindex = au_ibtop(inode); -+ h_inode = au_h_iptr(inode, bindex); -+ if (!au_test_ro(sb, bindex, inode)) { -+ h_mnt = au_sbr_mnt(sb, bindex); -+ err = vfsub_mnt_want_write(h_mnt); -+ if (!err) { -+ err = vfsub_update_time(h_inode, ts, flags); -+ vfsub_mnt_drop_write(h_mnt); -+ } -+ } else if (au_is_special(h_inode)) { -+ /* -+ * Never copy-up here. -+ * These special files may already be opened and used for -+ * communicating. If we copied it up, then the communication -+ * would be corrupted. -+ */ -+ AuWarn1("timestamps for i%lu are ignored " -+ "since it is on readonly branch (hi%lu).\n", -+ inode->i_ino, h_inode->i_ino); -+ } else if (flags & ~S_ATIME) { -+ err = -EIO; -+ AuIOErr1("unexpected flags 0x%x\n", flags); -+ AuDebugOn(1); -+ } -+ -+ if (!err) -+ au_cpup_attr_timesizes(inode); -+ ii_write_unlock(inode); -+ si_read_unlock(sb); -+ lockdep_on(); -+ -+ if (!err && (flags & S_VERSION)) -+ inode_inc_iversion(inode); -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* no getattr version will be set by module.c:aufs_init() */ -+struct inode_operations aufs_iop_nogetattr[AuIop_Last], -+ aufs_iop[] = { -+ [AuIop_SYMLINK] = { -+ .permission = aufs_permission, -+#ifdef CONFIG_FS_POSIX_ACL -+ .get_acl = aufs_get_acl, -+ .set_acl = aufs_set_acl, /* unsupport for symlink? */ -+#endif -+ -+ .setattr = aufs_setattr, -+ .getattr = aufs_getattr, -+ -+#ifdef CONFIG_AUFS_XATTR -+ .listxattr = aufs_listxattr, -+#endif -+ -+ .get_link = aufs_get_link, -+ -+ /* .update_time = aufs_update_time */ -+ }, -+ [AuIop_DIR] = { -+ .create = aufs_create, -+ .lookup = aufs_lookup, -+ .link = aufs_link, -+ .unlink = aufs_unlink, -+ .symlink = aufs_symlink, -+ .mkdir = aufs_mkdir, -+ .rmdir = aufs_rmdir, -+ .mknod = aufs_mknod, -+ .rename = aufs_rename, -+ -+ .permission = aufs_permission, -+#ifdef CONFIG_FS_POSIX_ACL -+ .get_acl = aufs_get_acl, -+ .set_acl = aufs_set_acl, -+#endif -+ -+ .setattr = aufs_setattr, -+ .getattr = aufs_getattr, -+ -+#ifdef CONFIG_AUFS_XATTR -+ .listxattr = aufs_listxattr, -+#endif -+ -+ .update_time = aufs_update_time, -+ .atomic_open = aufs_atomic_open, -+ .tmpfile = aufs_tmpfile -+ }, -+ [AuIop_OTHER] = { -+ .permission = aufs_permission, -+#ifdef CONFIG_FS_POSIX_ACL -+ .get_acl = aufs_get_acl, -+ .set_acl = aufs_set_acl, -+#endif -+ -+ .setattr = aufs_setattr, -+ .getattr = aufs_getattr, -+ -+#ifdef CONFIG_AUFS_XATTR -+ .listxattr = aufs_listxattr, -+#endif -+ -+ .update_time = aufs_update_time -+ } -+}; -diff --git a/fs/aufs/i_op_add.c b/fs/aufs/i_op_add.c -new file mode 100644 -index 000000000000..af6893e61066 ---- /dev/null -+++ b/fs/aufs/i_op_add.c -@@ -0,0 +1,936 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * inode operations (add entry) -+ */ -+ -+#include <linux/iversion.h> -+#include "aufs.h" -+ -+/* -+ * final procedure of adding a new entry, except link(2). -+ * remove whiteout, instantiate, copyup the parent dir's times and size -+ * and update version. -+ * if it failed, re-create the removed whiteout. -+ */ -+static int epilog(struct inode *dir, aufs_bindex_t bindex, -+ struct dentry *wh_dentry, struct dentry *dentry) -+{ -+ int err, rerr; -+ aufs_bindex_t bwh; -+ struct path h_path; -+ struct super_block *sb; -+ struct inode *inode, *h_dir; -+ struct dentry *wh; -+ -+ bwh = -1; -+ sb = dir->i_sb; -+ if (wh_dentry) { -+ h_dir = d_inode(wh_dentry->d_parent); /* dir inode is locked */ -+ IMustLock(h_dir); -+ AuDebugOn(au_h_iptr(dir, bindex) != h_dir); -+ bwh = au_dbwh(dentry); -+ h_path.dentry = wh_dentry; -+ h_path.mnt = au_sbr_mnt(sb, bindex); -+ err = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, -+ dentry); -+ if (unlikely(err)) -+ goto out; -+ } -+ -+ inode = au_new_inode(dentry, /*must_new*/1); -+ if (!IS_ERR(inode)) { -+ d_instantiate(dentry, inode); -+ dir = d_inode(dentry->d_parent); /* dir inode is locked */ -+ IMustLock(dir); -+ au_dir_ts(dir, bindex); -+ inode_inc_iversion(dir); -+ au_fhsm_wrote(sb, bindex, /*force*/0); -+ return 0; /* success */ -+ } -+ -+ err = PTR_ERR(inode); -+ if (!wh_dentry) -+ goto out; -+ -+ /* revert */ -+ /* dir inode is locked */ -+ wh = au_wh_create(dentry, bwh, wh_dentry->d_parent); -+ rerr = PTR_ERR(wh); -+ if (IS_ERR(wh)) { -+ AuIOErr("%pd reverting whiteout failed(%d, %d)\n", -+ dentry, err, rerr); -+ err = -EIO; -+ } else -+ dput(wh); -+ -+out: -+ return err; -+} -+ -+static int au_d_may_add(struct dentry *dentry) -+{ -+ int err; -+ -+ err = 0; -+ if (unlikely(d_unhashed(dentry))) -+ err = -ENOENT; -+ if (unlikely(d_really_is_positive(dentry))) -+ err = -EEXIST; -+ return err; -+} -+ -+/* -+ * simple tests for the adding inode operations. -+ * following the checks in vfs, plus the parent-child relationship. -+ */ -+int au_may_add(struct dentry *dentry, aufs_bindex_t bindex, -+ struct dentry *h_parent, int isdir) -+{ -+ int err; -+ umode_t h_mode; -+ struct dentry *h_dentry; -+ struct inode *h_inode; -+ -+ err = -ENAMETOOLONG; -+ if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) -+ goto out; -+ -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (d_really_is_negative(dentry)) { -+ err = -EEXIST; -+ if (unlikely(d_is_positive(h_dentry))) -+ goto out; -+ } else { -+ /* rename(2) case */ -+ err = -EIO; -+ if (unlikely(d_is_negative(h_dentry))) -+ goto out; -+ h_inode = d_inode(h_dentry); -+ if (unlikely(!h_inode->i_nlink)) -+ goto out; -+ -+ h_mode = h_inode->i_mode; -+ if (!isdir) { -+ err = -EISDIR; -+ if (unlikely(S_ISDIR(h_mode))) -+ goto out; -+ } else if (unlikely(!S_ISDIR(h_mode))) { -+ err = -ENOTDIR; -+ goto out; -+ } -+ } -+ -+ err = 0; -+ /* expected parent dir is locked */ -+ if (unlikely(h_parent != h_dentry->d_parent)) -+ err = -EIO; -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* -+ * initial procedure of adding a new entry. -+ * prepare writable branch and the parent dir, lock it, -+ * and lookup whiteout for the new entry. -+ */ -+static struct dentry* -+lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt, -+ struct dentry *src_dentry, struct au_pin *pin, -+ struct au_wr_dir_args *wr_dir_args) -+{ -+ struct dentry *wh_dentry, *h_parent; -+ struct super_block *sb; -+ struct au_branch *br; -+ int err; -+ unsigned int udba; -+ aufs_bindex_t bcpup; -+ -+ AuDbg("%pd\n", dentry); -+ -+ err = au_wr_dir(dentry, src_dentry, wr_dir_args); -+ bcpup = err; -+ wh_dentry = ERR_PTR(err); -+ if (unlikely(err < 0)) -+ goto out; -+ -+ sb = dentry->d_sb; -+ udba = au_opt_udba(sb); -+ err = au_pin(pin, dentry, bcpup, udba, -+ AuPin_DI_LOCKED | AuPin_MNT_WRITE); -+ wh_dentry = ERR_PTR(err); -+ if (unlikely(err)) -+ goto out; -+ -+ h_parent = au_pinned_h_parent(pin); -+ if (udba != AuOpt_UDBA_NONE -+ && au_dbtop(dentry) == bcpup) -+ err = au_may_add(dentry, bcpup, h_parent, -+ au_ftest_wrdir(wr_dir_args->flags, ISDIR)); -+ else if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) -+ err = -ENAMETOOLONG; -+ wh_dentry = ERR_PTR(err); -+ if (unlikely(err)) -+ goto out_unpin; -+ -+ br = au_sbr(sb, bcpup); -+ if (dt) { -+ struct path tmp = { -+ .dentry = h_parent, -+ .mnt = au_br_mnt(br) -+ }; -+ au_dtime_store(dt, au_pinned_parent(pin), &tmp); -+ } -+ -+ wh_dentry = NULL; -+ if (bcpup != au_dbwh(dentry)) -+ goto out; /* success */ -+ -+ /* -+ * ENAMETOOLONG here means that if we allowed create such name, then it -+ * would not be able to removed in the future. So we don't allow such -+ * name here and we don't handle ENAMETOOLONG differently here. -+ */ -+ wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, br); -+ -+out_unpin: -+ if (IS_ERR(wh_dentry)) -+ au_unpin(pin); -+out: -+ return wh_dentry; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+enum { Mknod, Symlink, Creat }; -+struct simple_arg { -+ int type; -+ union { -+ struct { -+ umode_t mode; -+ bool want_excl; -+ bool try_aopen; -+ struct vfsub_aopen_args *aopen; -+ } c; -+ struct { -+ const char *symname; -+ } s; -+ struct { -+ umode_t mode; -+ dev_t dev; -+ } m; -+ } u; -+}; -+ -+static int add_simple(struct inode *dir, struct dentry *dentry, -+ struct simple_arg *arg) -+{ -+ int err, rerr; -+ aufs_bindex_t btop; -+ unsigned char created; -+ const unsigned char try_aopen -+ = (arg->type == Creat && arg->u.c.try_aopen); -+ struct vfsub_aopen_args *aopen = arg->u.c.aopen; -+ struct dentry *wh_dentry, *parent; -+ struct inode *h_dir; -+ struct super_block *sb; -+ struct au_branch *br; -+ /* to reduce stack size */ -+ struct { -+ struct au_dtime dt; -+ struct au_pin pin; -+ struct path h_path; -+ struct au_wr_dir_args wr_dir_args; -+ } *a; -+ -+ AuDbg("%pd\n", dentry); -+ IMustLock(dir); -+ -+ err = -ENOMEM; -+ a = kmalloc(sizeof(*a), GFP_NOFS); -+ if (unlikely(!a)) -+ goto out; -+ a->wr_dir_args.force_btgt = -1; -+ a->wr_dir_args.flags = AuWrDir_ADD_ENTRY; -+ -+ parent = dentry->d_parent; /* dir inode is locked */ -+ if (!try_aopen) { -+ err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); -+ if (unlikely(err)) -+ goto out_free; -+ } -+ err = au_d_may_add(dentry); -+ if (unlikely(err)) -+ goto out_unlock; -+ if (!try_aopen) -+ di_write_lock_parent(parent); -+ wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL, -+ &a->pin, &a->wr_dir_args); -+ err = PTR_ERR(wh_dentry); -+ if (IS_ERR(wh_dentry)) -+ goto out_parent; -+ -+ btop = au_dbtop(dentry); -+ sb = dentry->d_sb; -+ br = au_sbr(sb, btop); -+ a->h_path.dentry = au_h_dptr(dentry, btop); -+ a->h_path.mnt = au_br_mnt(br); -+ h_dir = au_pinned_h_dir(&a->pin); -+ switch (arg->type) { -+ case Creat: -+ if (!try_aopen || !h_dir->i_op->atomic_open) { -+ err = vfsub_create(h_dir, &a->h_path, arg->u.c.mode, -+ arg->u.c.want_excl); -+ created = !err; -+ if (!err && try_aopen) -+ aopen->file->f_mode |= FMODE_CREATED; -+ } else { -+ aopen->br = br; -+ err = vfsub_atomic_open(h_dir, a->h_path.dentry, aopen); -+ AuDbg("err %d\n", err); -+ AuDbgFile(aopen->file); -+ created = err >= 0 -+ && !!(aopen->file->f_mode & FMODE_CREATED); -+ } -+ break; -+ case Symlink: -+ err = vfsub_symlink(h_dir, &a->h_path, arg->u.s.symname); -+ created = !err; -+ break; -+ case Mknod: -+ err = vfsub_mknod(h_dir, &a->h_path, arg->u.m.mode, -+ arg->u.m.dev); -+ created = !err; -+ break; -+ default: -+ BUG(); -+ } -+ if (unlikely(err < 0)) -+ goto out_unpin; -+ -+ err = epilog(dir, btop, wh_dentry, dentry); -+ if (!err) -+ goto out_unpin; /* success */ -+ -+ /* revert */ -+ if (created /* && d_is_positive(a->h_path.dentry) */) { -+ /* no delegation since it is just created */ -+ rerr = vfsub_unlink(h_dir, &a->h_path, /*delegated*/NULL, -+ /*force*/0); -+ if (rerr) { -+ AuIOErr("%pd revert failure(%d, %d)\n", -+ dentry, err, rerr); -+ err = -EIO; -+ } -+ au_dtime_revert(&a->dt); -+ } -+ if (try_aopen && h_dir->i_op->atomic_open -+ && (aopen->file->f_mode & FMODE_OPENED)) -+ /* aopen->file is still opened */ -+ au_lcnt_dec(&aopen->br->br_nfiles); -+ -+out_unpin: -+ au_unpin(&a->pin); -+ dput(wh_dentry); -+out_parent: -+ if (!try_aopen) -+ di_write_unlock(parent); -+out_unlock: -+ if (unlikely(err)) { -+ au_update_dbtop(dentry); -+ d_drop(dentry); -+ } -+ if (!try_aopen) -+ aufs_read_unlock(dentry, AuLock_DW); -+out_free: -+ au_kfree_rcu(a); -+out: -+ return err; -+} -+ -+int aufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, -+ dev_t dev) -+{ -+ struct simple_arg arg = { -+ .type = Mknod, -+ .u.m = { -+ .mode = mode, -+ .dev = dev -+ } -+ }; -+ return add_simple(dir, dentry, &arg); -+} -+ -+int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) -+{ -+ struct simple_arg arg = { -+ .type = Symlink, -+ .u.s.symname = symname -+ }; -+ return add_simple(dir, dentry, &arg); -+} -+ -+int aufs_create(struct inode *dir, struct dentry *dentry, umode_t mode, -+ bool want_excl) -+{ -+ struct simple_arg arg = { -+ .type = Creat, -+ .u.c = { -+ .mode = mode, -+ .want_excl = want_excl -+ } -+ }; -+ return add_simple(dir, dentry, &arg); -+} -+ -+int au_aopen_or_create(struct inode *dir, struct dentry *dentry, -+ struct vfsub_aopen_args *aopen_args) -+{ -+ struct simple_arg arg = { -+ .type = Creat, -+ .u.c = { -+ .mode = aopen_args->create_mode, -+ .want_excl = aopen_args->open_flag & O_EXCL, -+ .try_aopen = true, -+ .aopen = aopen_args -+ } -+ }; -+ return add_simple(dir, dentry, &arg); -+} -+ -+int aufs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) -+{ -+ int err; -+ aufs_bindex_t bindex; -+ struct super_block *sb; -+ struct dentry *parent, *h_parent, *h_dentry; -+ struct inode *h_dir, *inode; -+ struct vfsmount *h_mnt; -+ struct au_wr_dir_args wr_dir_args = { -+ .force_btgt = -1, -+ .flags = AuWrDir_TMPFILE -+ }; -+ -+ /* copy-up may happen */ -+ inode_lock(dir); -+ -+ sb = dir->i_sb; -+ err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); -+ if (unlikely(err)) -+ goto out; -+ -+ err = au_di_init(dentry); -+ if (unlikely(err)) -+ goto out_si; -+ -+ err = -EBUSY; -+ parent = d_find_any_alias(dir); -+ AuDebugOn(!parent); -+ di_write_lock_parent(parent); -+ if (unlikely(d_inode(parent) != dir)) -+ goto out_parent; -+ -+ err = au_digen_test(parent, au_sigen(sb)); -+ if (unlikely(err)) -+ goto out_parent; -+ -+ bindex = au_dbtop(parent); -+ au_set_dbtop(dentry, bindex); -+ au_set_dbbot(dentry, bindex); -+ err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args); -+ bindex = err; -+ if (unlikely(err < 0)) -+ goto out_parent; -+ -+ err = -EOPNOTSUPP; -+ h_dir = au_h_iptr(dir, bindex); -+ if (unlikely(!h_dir->i_op->tmpfile)) -+ goto out_parent; -+ -+ h_mnt = au_sbr_mnt(sb, bindex); -+ err = vfsub_mnt_want_write(h_mnt); -+ if (unlikely(err)) -+ goto out_parent; -+ -+ h_parent = au_h_dptr(parent, bindex); -+ h_dentry = vfs_tmpfile(h_parent, mode, /*open_flag*/0); -+ if (IS_ERR(h_dentry)) { -+ err = PTR_ERR(h_dentry); -+ goto out_mnt; -+ } -+ -+ au_set_dbtop(dentry, bindex); -+ au_set_dbbot(dentry, bindex); -+ au_set_h_dptr(dentry, bindex, dget(h_dentry)); -+ inode = au_new_inode(dentry, /*must_new*/1); -+ if (IS_ERR(inode)) { -+ err = PTR_ERR(inode); -+ au_set_h_dptr(dentry, bindex, NULL); -+ au_set_dbtop(dentry, -1); -+ au_set_dbbot(dentry, -1); -+ } else { -+ if (!inode->i_nlink) -+ set_nlink(inode, 1); -+ d_tmpfile(dentry, inode); -+ au_di(dentry)->di_tmpfile = 1; -+ -+ /* update without i_mutex */ -+ if (au_ibtop(dir) == au_dbtop(dentry)) -+ au_cpup_attr_timesizes(dir); -+ } -+ dput(h_dentry); -+ -+out_mnt: -+ vfsub_mnt_drop_write(h_mnt); -+out_parent: -+ di_write_unlock(parent); -+ dput(parent); -+ di_write_unlock(dentry); -+ if (unlikely(err)) { -+ au_di_fin(dentry); -+ dentry->d_fsdata = NULL; -+ } -+out_si: -+ si_read_unlock(sb); -+out: -+ inode_unlock(dir); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct au_link_args { -+ aufs_bindex_t bdst, bsrc; -+ struct au_pin pin; -+ struct path h_path; -+ struct dentry *src_parent, *parent; -+}; -+ -+static int au_cpup_before_link(struct dentry *src_dentry, -+ struct au_link_args *a) -+{ -+ int err; -+ struct dentry *h_src_dentry; -+ struct au_cp_generic cpg = { -+ .dentry = src_dentry, -+ .bdst = a->bdst, -+ .bsrc = a->bsrc, -+ .len = -1, -+ .pin = &a->pin, -+ .flags = AuCpup_DTIME | AuCpup_HOPEN /* | AuCpup_KEEPLINO */ -+ }; -+ -+ di_read_lock_parent(a->src_parent, AuLock_IR); -+ err = au_test_and_cpup_dirs(src_dentry, a->bdst); -+ if (unlikely(err)) -+ goto out; -+ -+ h_src_dentry = au_h_dptr(src_dentry, a->bsrc); -+ err = au_pin(&a->pin, src_dentry, a->bdst, -+ au_opt_udba(src_dentry->d_sb), -+ AuPin_DI_LOCKED | AuPin_MNT_WRITE); -+ if (unlikely(err)) -+ goto out; -+ -+ err = au_sio_cpup_simple(&cpg); -+ au_unpin(&a->pin); -+ -+out: -+ di_read_unlock(a->src_parent, AuLock_IR); -+ return err; -+} -+ -+static int au_cpup_or_link(struct dentry *src_dentry, struct dentry *dentry, -+ struct au_link_args *a) -+{ -+ int err; -+ unsigned char plink; -+ aufs_bindex_t bbot; -+ struct dentry *h_src_dentry; -+ struct inode *h_inode, *inode, *delegated; -+ struct super_block *sb; -+ struct file *h_file; -+ -+ plink = 0; -+ h_inode = NULL; -+ sb = src_dentry->d_sb; -+ inode = d_inode(src_dentry); -+ if (au_ibtop(inode) <= a->bdst) -+ h_inode = au_h_iptr(inode, a->bdst); -+ if (!h_inode || !h_inode->i_nlink) { -+ /* copyup src_dentry as the name of dentry. */ -+ bbot = au_dbbot(dentry); -+ if (bbot < a->bsrc) -+ au_set_dbbot(dentry, a->bsrc); -+ au_set_h_dptr(dentry, a->bsrc, -+ dget(au_h_dptr(src_dentry, a->bsrc))); -+ dget(a->h_path.dentry); -+ au_set_h_dptr(dentry, a->bdst, NULL); -+ AuDbg("temporary d_inode...\n"); -+ spin_lock(&dentry->d_lock); -+ dentry->d_inode = d_inode(src_dentry); /* tmp */ -+ spin_unlock(&dentry->d_lock); -+ h_file = au_h_open_pre(dentry, a->bsrc, /*force_wr*/0); -+ if (IS_ERR(h_file)) -+ err = PTR_ERR(h_file); -+ else { -+ struct au_cp_generic cpg = { -+ .dentry = dentry, -+ .bdst = a->bdst, -+ .bsrc = -1, -+ .len = -1, -+ .pin = &a->pin, -+ .flags = AuCpup_KEEPLINO -+ }; -+ err = au_sio_cpup_simple(&cpg); -+ au_h_open_post(dentry, a->bsrc, h_file); -+ if (!err) { -+ dput(a->h_path.dentry); -+ a->h_path.dentry = au_h_dptr(dentry, a->bdst); -+ } else -+ au_set_h_dptr(dentry, a->bdst, -+ a->h_path.dentry); -+ } -+ spin_lock(&dentry->d_lock); -+ dentry->d_inode = NULL; /* restore */ -+ spin_unlock(&dentry->d_lock); -+ AuDbg("temporary d_inode...done\n"); -+ au_set_h_dptr(dentry, a->bsrc, NULL); -+ au_set_dbbot(dentry, bbot); -+ } else { -+ /* the inode of src_dentry already exists on a.bdst branch */ -+ h_src_dentry = d_find_alias(h_inode); -+ if (!h_src_dentry && au_plink_test(inode)) { -+ plink = 1; -+ h_src_dentry = au_plink_lkup(inode, a->bdst); -+ err = PTR_ERR(h_src_dentry); -+ if (IS_ERR(h_src_dentry)) -+ goto out; -+ -+ if (unlikely(d_is_negative(h_src_dentry))) { -+ dput(h_src_dentry); -+ h_src_dentry = NULL; -+ } -+ -+ } -+ if (h_src_dentry) { -+ delegated = NULL; -+ err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin), -+ &a->h_path, &delegated); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal link\n"); -+ iput(delegated); -+ } -+ dput(h_src_dentry); -+ } else { -+ AuIOErr("no dentry found for hi%lu on b%d\n", -+ h_inode->i_ino, a->bdst); -+ err = -EIO; -+ } -+ } -+ -+ if (!err && !plink) -+ au_plink_append(inode, a->bdst, a->h_path.dentry); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+int aufs_link(struct dentry *src_dentry, struct inode *dir, -+ struct dentry *dentry) -+{ -+ int err, rerr; -+ struct au_dtime dt; -+ struct au_link_args *a; -+ struct dentry *wh_dentry, *h_src_dentry; -+ struct inode *inode, *delegated; -+ struct super_block *sb; -+ struct au_wr_dir_args wr_dir_args = { -+ /* .force_btgt = -1, */ -+ .flags = AuWrDir_ADD_ENTRY -+ }; -+ -+ IMustLock(dir); -+ inode = d_inode(src_dentry); -+ IMustLock(inode); -+ -+ err = -ENOMEM; -+ a = kzalloc(sizeof(*a), GFP_NOFS); -+ if (unlikely(!a)) -+ goto out; -+ -+ a->parent = dentry->d_parent; /* dir inode is locked */ -+ err = aufs_read_and_write_lock2(dentry, src_dentry, -+ AuLock_NOPLM | AuLock_GEN); -+ if (unlikely(err)) -+ goto out_kfree; -+ err = au_d_linkable(src_dentry); -+ if (unlikely(err)) -+ goto out_unlock; -+ err = au_d_may_add(dentry); -+ if (unlikely(err)) -+ goto out_unlock; -+ -+ a->src_parent = dget_parent(src_dentry); -+ wr_dir_args.force_btgt = au_ibtop(inode); -+ -+ di_write_lock_parent(a->parent); -+ wr_dir_args.force_btgt = au_wbr(dentry, wr_dir_args.force_btgt); -+ wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, &a->pin, -+ &wr_dir_args); -+ err = PTR_ERR(wh_dentry); -+ if (IS_ERR(wh_dentry)) -+ goto out_parent; -+ -+ err = 0; -+ sb = dentry->d_sb; -+ a->bdst = au_dbtop(dentry); -+ a->h_path.dentry = au_h_dptr(dentry, a->bdst); -+ a->h_path.mnt = au_sbr_mnt(sb, a->bdst); -+ a->bsrc = au_ibtop(inode); -+ h_src_dentry = au_h_d_alias(src_dentry, a->bsrc); -+ if (!h_src_dentry && au_di(src_dentry)->di_tmpfile) -+ h_src_dentry = dget(au_hi_wh(inode, a->bsrc)); -+ if (!h_src_dentry) { -+ a->bsrc = au_dbtop(src_dentry); -+ h_src_dentry = au_h_d_alias(src_dentry, a->bsrc); -+ AuDebugOn(!h_src_dentry); -+ } else if (IS_ERR(h_src_dentry)) { -+ err = PTR_ERR(h_src_dentry); -+ goto out_parent; -+ } -+ -+ /* -+ * aufs doesn't touch the credential so -+ * security_dentry_create_files_as() is unnecessary. -+ */ -+ if (au_opt_test(au_mntflags(sb), PLINK)) { -+ if (a->bdst < a->bsrc -+ /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) -+ err = au_cpup_or_link(src_dentry, dentry, a); -+ else { -+ delegated = NULL; -+ err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin), -+ &a->h_path, &delegated); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal link\n"); -+ iput(delegated); -+ } -+ } -+ dput(h_src_dentry); -+ } else { -+ /* -+ * copyup src_dentry to the branch we process, -+ * and then link(2) to it. -+ */ -+ dput(h_src_dentry); -+ if (a->bdst < a->bsrc -+ /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) { -+ au_unpin(&a->pin); -+ di_write_unlock(a->parent); -+ err = au_cpup_before_link(src_dentry, a); -+ di_write_lock_parent(a->parent); -+ if (!err) -+ err = au_pin(&a->pin, dentry, a->bdst, -+ au_opt_udba(sb), -+ AuPin_DI_LOCKED | AuPin_MNT_WRITE); -+ if (unlikely(err)) -+ goto out_wh; -+ } -+ if (!err) { -+ h_src_dentry = au_h_dptr(src_dentry, a->bdst); -+ err = -ENOENT; -+ if (h_src_dentry && d_is_positive(h_src_dentry)) { -+ delegated = NULL; -+ err = vfsub_link(h_src_dentry, -+ au_pinned_h_dir(&a->pin), -+ &a->h_path, &delegated); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry" -+ " for NFSv4 delegation" -+ " for an internal link\n"); -+ iput(delegated); -+ } -+ } -+ } -+ } -+ if (unlikely(err)) -+ goto out_unpin; -+ -+ if (wh_dentry) { -+ a->h_path.dentry = wh_dentry; -+ err = au_wh_unlink_dentry(au_pinned_h_dir(&a->pin), &a->h_path, -+ dentry); -+ if (unlikely(err)) -+ goto out_revert; -+ } -+ -+ au_dir_ts(dir, a->bdst); -+ inode_inc_iversion(dir); -+ inc_nlink(inode); -+ inode->i_ctime = dir->i_ctime; -+ d_instantiate(dentry, au_igrab(inode)); -+ if (d_unhashed(a->h_path.dentry)) -+ /* some filesystem calls d_drop() */ -+ d_drop(dentry); -+ /* some filesystems consume an inode even hardlink */ -+ au_fhsm_wrote(sb, a->bdst, /*force*/0); -+ goto out_unpin; /* success */ -+ -+out_revert: -+ /* no delegation since it is just created */ -+ rerr = vfsub_unlink(au_pinned_h_dir(&a->pin), &a->h_path, -+ /*delegated*/NULL, /*force*/0); -+ if (unlikely(rerr)) { -+ AuIOErr("%pd reverting failed(%d, %d)\n", dentry, err, rerr); -+ err = -EIO; -+ } -+ au_dtime_revert(&dt); -+out_unpin: -+ au_unpin(&a->pin); -+out_wh: -+ dput(wh_dentry); -+out_parent: -+ di_write_unlock(a->parent); -+ dput(a->src_parent); -+out_unlock: -+ if (unlikely(err)) { -+ au_update_dbtop(dentry); -+ d_drop(dentry); -+ } -+ aufs_read_and_write_unlock2(dentry, src_dentry); -+out_kfree: -+ au_kfree_rcu(a); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+int aufs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) -+{ -+ int err, rerr; -+ aufs_bindex_t bindex; -+ unsigned char diropq; -+ struct path h_path; -+ struct dentry *wh_dentry, *parent, *opq_dentry; -+ struct inode *h_inode; -+ struct super_block *sb; -+ struct { -+ struct au_pin pin; -+ struct au_dtime dt; -+ } *a; /* reduce the stack usage */ -+ struct au_wr_dir_args wr_dir_args = { -+ .force_btgt = -1, -+ .flags = AuWrDir_ADD_ENTRY | AuWrDir_ISDIR -+ }; -+ -+ IMustLock(dir); -+ -+ err = -ENOMEM; -+ a = kmalloc(sizeof(*a), GFP_NOFS); -+ if (unlikely(!a)) -+ goto out; -+ -+ err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); -+ if (unlikely(err)) -+ goto out_free; -+ err = au_d_may_add(dentry); -+ if (unlikely(err)) -+ goto out_unlock; -+ -+ parent = dentry->d_parent; /* dir inode is locked */ -+ di_write_lock_parent(parent); -+ wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL, -+ &a->pin, &wr_dir_args); -+ err = PTR_ERR(wh_dentry); -+ if (IS_ERR(wh_dentry)) -+ goto out_parent; -+ -+ sb = dentry->d_sb; -+ bindex = au_dbtop(dentry); -+ h_path.dentry = au_h_dptr(dentry, bindex); -+ h_path.mnt = au_sbr_mnt(sb, bindex); -+ err = vfsub_mkdir(au_pinned_h_dir(&a->pin), &h_path, mode); -+ if (unlikely(err)) -+ goto out_unpin; -+ -+ /* make the dir opaque */ -+ diropq = 0; -+ h_inode = d_inode(h_path.dentry); -+ if (wh_dentry -+ || au_opt_test(au_mntflags(sb), ALWAYS_DIROPQ)) { -+ inode_lock_nested(h_inode, AuLsc_I_CHILD); -+ opq_dentry = au_diropq_create(dentry, bindex); -+ inode_unlock(h_inode); -+ err = PTR_ERR(opq_dentry); -+ if (IS_ERR(opq_dentry)) -+ goto out_dir; -+ dput(opq_dentry); -+ diropq = 1; -+ } -+ -+ err = epilog(dir, bindex, wh_dentry, dentry); -+ if (!err) { -+ inc_nlink(dir); -+ goto out_unpin; /* success */ -+ } -+ -+ /* revert */ -+ if (diropq) { -+ AuLabel(revert opq); -+ inode_lock_nested(h_inode, AuLsc_I_CHILD); -+ rerr = au_diropq_remove(dentry, bindex); -+ inode_unlock(h_inode); -+ if (rerr) { -+ AuIOErr("%pd reverting diropq failed(%d, %d)\n", -+ dentry, err, rerr); -+ err = -EIO; -+ } -+ } -+ -+out_dir: -+ AuLabel(revert dir); -+ rerr = vfsub_rmdir(au_pinned_h_dir(&a->pin), &h_path); -+ if (rerr) { -+ AuIOErr("%pd reverting dir failed(%d, %d)\n", -+ dentry, err, rerr); -+ err = -EIO; -+ } -+ au_dtime_revert(&a->dt); -+out_unpin: -+ au_unpin(&a->pin); -+ dput(wh_dentry); -+out_parent: -+ di_write_unlock(parent); -+out_unlock: -+ if (unlikely(err)) { -+ au_update_dbtop(dentry); -+ d_drop(dentry); -+ } -+ aufs_read_unlock(dentry, AuLock_DW); -+out_free: -+ au_kfree_rcu(a); -+out: -+ return err; -+} -diff --git a/fs/aufs/i_op_del.c b/fs/aufs/i_op_del.c -new file mode 100644 -index 000000000000..1c459dbea5db ---- /dev/null -+++ b/fs/aufs/i_op_del.c -@@ -0,0 +1,513 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * inode operations (del entry) -+ */ -+ -+#include <linux/iversion.h> -+#include "aufs.h" -+ -+/* -+ * decide if a new whiteout for @dentry is necessary or not. -+ * when it is necessary, prepare the parent dir for the upper branch whose -+ * branch index is @bcpup for creation. the actual creation of the whiteout will -+ * be done by caller. -+ * return value: -+ * 0: wh is unnecessary -+ * plus: wh is necessary -+ * minus: error -+ */ -+int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup) -+{ -+ int need_wh, err; -+ aufs_bindex_t btop; -+ struct super_block *sb; -+ -+ sb = dentry->d_sb; -+ btop = au_dbtop(dentry); -+ if (*bcpup < 0) { -+ *bcpup = btop; -+ if (au_test_ro(sb, btop, d_inode(dentry))) { -+ err = AuWbrCopyup(au_sbi(sb), dentry); -+ *bcpup = err; -+ if (unlikely(err < 0)) -+ goto out; -+ } -+ } else -+ AuDebugOn(btop < *bcpup -+ || au_test_ro(sb, *bcpup, d_inode(dentry))); -+ AuDbg("bcpup %d, btop %d\n", *bcpup, btop); -+ -+ if (*bcpup != btop) { -+ err = au_cpup_dirs(dentry, *bcpup); -+ if (unlikely(err)) -+ goto out; -+ need_wh = 1; -+ } else { -+ struct au_dinfo *dinfo, *tmp; -+ -+ need_wh = -ENOMEM; -+ dinfo = au_di(dentry); -+ tmp = au_di_alloc(sb, AuLsc_DI_TMP); -+ if (tmp) { -+ au_di_cp(tmp, dinfo); -+ au_di_swap(tmp, dinfo); -+ /* returns the number of positive dentries */ -+ need_wh = au_lkup_dentry(dentry, btop + 1, -+ /* AuLkup_IGNORE_PERM */ 0); -+ au_di_swap(tmp, dinfo); -+ au_rw_write_unlock(&tmp->di_rwsem); -+ au_di_free(tmp); -+ } -+ } -+ AuDbg("need_wh %d\n", need_wh); -+ err = need_wh; -+ -+out: -+ return err; -+} -+ -+/* -+ * simple tests for the del-entry operations. -+ * following the checks in vfs, plus the parent-child relationship. -+ */ -+int au_may_del(struct dentry *dentry, aufs_bindex_t bindex, -+ struct dentry *h_parent, int isdir) -+{ -+ int err; -+ umode_t h_mode; -+ struct dentry *h_dentry, *h_latest; -+ struct inode *h_inode; -+ -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (d_really_is_positive(dentry)) { -+ err = -ENOENT; -+ if (unlikely(d_is_negative(h_dentry))) -+ goto out; -+ h_inode = d_inode(h_dentry); -+ if (unlikely(!h_inode->i_nlink)) -+ goto out; -+ -+ h_mode = h_inode->i_mode; -+ if (!isdir) { -+ err = -EISDIR; -+ if (unlikely(S_ISDIR(h_mode))) -+ goto out; -+ } else if (unlikely(!S_ISDIR(h_mode))) { -+ err = -ENOTDIR; -+ goto out; -+ } -+ } else { -+ /* rename(2) case */ -+ err = -EIO; -+ if (unlikely(d_is_positive(h_dentry))) -+ goto out; -+ } -+ -+ err = -ENOENT; -+ /* expected parent dir is locked */ -+ if (unlikely(h_parent != h_dentry->d_parent)) -+ goto out; -+ err = 0; -+ -+ /* -+ * rmdir a dir may break the consistency on some filesystem. -+ * let's try heavy test. -+ */ -+ err = -EACCES; -+ if (unlikely(!au_opt_test(au_mntflags(dentry->d_sb), DIRPERM1) -+ && au_test_h_perm(d_inode(h_parent), -+ MAY_EXEC | MAY_WRITE))) -+ goto out; -+ -+ h_latest = au_sio_lkup_one(&dentry->d_name, h_parent); -+ err = -EIO; -+ if (IS_ERR(h_latest)) -+ goto out; -+ if (h_latest == h_dentry) -+ err = 0; -+ dput(h_latest); -+ -+out: -+ return err; -+} -+ -+/* -+ * decide the branch where we operate for @dentry. the branch index will be set -+ * @rbcpup. after deciding it, 'pin' it and store the timestamps of the parent -+ * dir for reverting. -+ * when a new whiteout is necessary, create it. -+ */ -+static struct dentry* -+lock_hdir_create_wh(struct dentry *dentry, int isdir, aufs_bindex_t *rbcpup, -+ struct au_dtime *dt, struct au_pin *pin) -+{ -+ struct dentry *wh_dentry; -+ struct super_block *sb; -+ struct path h_path; -+ int err, need_wh; -+ unsigned int udba; -+ aufs_bindex_t bcpup; -+ -+ need_wh = au_wr_dir_need_wh(dentry, isdir, rbcpup); -+ wh_dentry = ERR_PTR(need_wh); -+ if (unlikely(need_wh < 0)) -+ goto out; -+ -+ sb = dentry->d_sb; -+ udba = au_opt_udba(sb); -+ bcpup = *rbcpup; -+ err = au_pin(pin, dentry, bcpup, udba, -+ AuPin_DI_LOCKED | AuPin_MNT_WRITE); -+ wh_dentry = ERR_PTR(err); -+ if (unlikely(err)) -+ goto out; -+ -+ h_path.dentry = au_pinned_h_parent(pin); -+ if (udba != AuOpt_UDBA_NONE -+ && au_dbtop(dentry) == bcpup) { -+ err = au_may_del(dentry, bcpup, h_path.dentry, isdir); -+ wh_dentry = ERR_PTR(err); -+ if (unlikely(err)) -+ goto out_unpin; -+ } -+ -+ h_path.mnt = au_sbr_mnt(sb, bcpup); -+ au_dtime_store(dt, au_pinned_parent(pin), &h_path); -+ wh_dentry = NULL; -+ if (!need_wh) -+ goto out; /* success, no need to create whiteout */ -+ -+ wh_dentry = au_wh_create(dentry, bcpup, h_path.dentry); -+ if (IS_ERR(wh_dentry)) -+ goto out_unpin; -+ -+ /* returns with the parent is locked and wh_dentry is dget-ed */ -+ goto out; /* success */ -+ -+out_unpin: -+ au_unpin(pin); -+out: -+ return wh_dentry; -+} -+ -+/* -+ * when removing a dir, rename it to a unique temporary whiteout-ed name first -+ * in order to be revertible and save time for removing many child whiteouts -+ * under the dir. -+ * returns 1 when there are too many child whiteout and caller should remove -+ * them asynchronously. returns 0 when the number of children is enough small to -+ * remove now or the branch fs is a remote fs. -+ * otherwise return an error. -+ */ -+static int renwh_and_rmdir(struct dentry *dentry, aufs_bindex_t bindex, -+ struct au_nhash *whlist, struct inode *dir) -+{ -+ int rmdir_later, err, dirwh; -+ struct dentry *h_dentry; -+ struct super_block *sb; -+ struct inode *inode; -+ -+ sb = dentry->d_sb; -+ SiMustAnyLock(sb); -+ h_dentry = au_h_dptr(dentry, bindex); -+ err = au_whtmp_ren(h_dentry, au_sbr(sb, bindex)); -+ if (unlikely(err)) -+ goto out; -+ -+ /* stop monitoring */ -+ inode = d_inode(dentry); -+ au_hn_free(au_hi(inode, bindex)); -+ -+ if (!au_test_fs_remote(h_dentry->d_sb)) { -+ dirwh = au_sbi(sb)->si_dirwh; -+ rmdir_later = (dirwh <= 1); -+ if (!rmdir_later) -+ rmdir_later = au_nhash_test_longer_wh(whlist, bindex, -+ dirwh); -+ if (rmdir_later) -+ return rmdir_later; -+ } -+ -+ err = au_whtmp_rmdir(dir, bindex, h_dentry, whlist); -+ if (unlikely(err)) { -+ AuIOErr("rmdir %pd, b%d failed, %d. ignored\n", -+ h_dentry, bindex, err); -+ err = 0; -+ } -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* -+ * final procedure for deleting a entry. -+ * maintain dentry and iattr. -+ */ -+static void epilog(struct inode *dir, struct dentry *dentry, -+ aufs_bindex_t bindex) -+{ -+ struct inode *inode; -+ -+ inode = d_inode(dentry); -+ d_drop(dentry); -+ inode->i_ctime = dir->i_ctime; -+ -+ au_dir_ts(dir, bindex); -+ inode_inc_iversion(dir); -+} -+ -+/* -+ * when an error happened, remove the created whiteout and revert everything. -+ */ -+static int do_revert(int err, struct inode *dir, aufs_bindex_t bindex, -+ aufs_bindex_t bwh, struct dentry *wh_dentry, -+ struct dentry *dentry, struct au_dtime *dt) -+{ -+ int rerr; -+ struct path h_path = { -+ .dentry = wh_dentry, -+ .mnt = au_sbr_mnt(dir->i_sb, bindex) -+ }; -+ -+ rerr = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, dentry); -+ if (!rerr) { -+ au_set_dbwh(dentry, bwh); -+ au_dtime_revert(dt); -+ return 0; -+ } -+ -+ AuIOErr("%pd reverting whiteout failed(%d, %d)\n", dentry, err, rerr); -+ return -EIO; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int aufs_unlink(struct inode *dir, struct dentry *dentry) -+{ -+ int err; -+ aufs_bindex_t bwh, bindex, btop; -+ struct inode *inode, *h_dir, *delegated; -+ struct dentry *parent, *wh_dentry; -+ /* to reduce stack size */ -+ struct { -+ struct au_dtime dt; -+ struct au_pin pin; -+ struct path h_path; -+ } *a; -+ -+ IMustLock(dir); -+ -+ err = -ENOMEM; -+ a = kmalloc(sizeof(*a), GFP_NOFS); -+ if (unlikely(!a)) -+ goto out; -+ -+ err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); -+ if (unlikely(err)) -+ goto out_free; -+ err = au_d_hashed_positive(dentry); -+ if (unlikely(err)) -+ goto out_unlock; -+ inode = d_inode(dentry); -+ IMustLock(inode); -+ err = -EISDIR; -+ if (unlikely(d_is_dir(dentry))) -+ goto out_unlock; /* possible? */ -+ -+ btop = au_dbtop(dentry); -+ bwh = au_dbwh(dentry); -+ bindex = -1; -+ parent = dentry->d_parent; /* dir inode is locked */ -+ di_write_lock_parent(parent); -+ wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &a->dt, -+ &a->pin); -+ err = PTR_ERR(wh_dentry); -+ if (IS_ERR(wh_dentry)) -+ goto out_parent; -+ -+ a->h_path.mnt = au_sbr_mnt(dentry->d_sb, btop); -+ a->h_path.dentry = au_h_dptr(dentry, btop); -+ dget(a->h_path.dentry); -+ if (bindex == btop) { -+ h_dir = au_pinned_h_dir(&a->pin); -+ delegated = NULL; -+ err = vfsub_unlink(h_dir, &a->h_path, &delegated, /*force*/0); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal unlink\n"); -+ iput(delegated); -+ } -+ } else { -+ /* dir inode is locked */ -+ h_dir = d_inode(wh_dentry->d_parent); -+ IMustLock(h_dir); -+ err = 0; -+ } -+ -+ if (!err) { -+ vfsub_drop_nlink(inode); -+ epilog(dir, dentry, bindex); -+ -+ /* update target timestamps */ -+ if (bindex == btop) { -+ vfsub_update_h_iattr(&a->h_path, /*did*/NULL); -+ /*ignore*/ -+ inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime; -+ } else -+ /* todo: this timestamp may be reverted later */ -+ inode->i_ctime = h_dir->i_ctime; -+ goto out_unpin; /* success */ -+ } -+ -+ /* revert */ -+ if (wh_dentry) { -+ int rerr; -+ -+ rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, -+ &a->dt); -+ if (rerr) -+ err = rerr; -+ } -+ -+out_unpin: -+ au_unpin(&a->pin); -+ dput(wh_dentry); -+ dput(a->h_path.dentry); -+out_parent: -+ di_write_unlock(parent); -+out_unlock: -+ aufs_read_unlock(dentry, AuLock_DW); -+out_free: -+ au_kfree_rcu(a); -+out: -+ return err; -+} -+ -+int aufs_rmdir(struct inode *dir, struct dentry *dentry) -+{ -+ int err, rmdir_later; -+ aufs_bindex_t bwh, bindex, btop; -+ struct inode *inode; -+ struct dentry *parent, *wh_dentry, *h_dentry; -+ struct au_whtmp_rmdir *args; -+ /* to reduce stack size */ -+ struct { -+ struct au_dtime dt; -+ struct au_pin pin; -+ } *a; -+ -+ IMustLock(dir); -+ -+ err = -ENOMEM; -+ a = kmalloc(sizeof(*a), GFP_NOFS); -+ if (unlikely(!a)) -+ goto out; -+ -+ err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN); -+ if (unlikely(err)) -+ goto out_free; -+ err = au_alive_dir(dentry); -+ if (unlikely(err)) -+ goto out_unlock; -+ inode = d_inode(dentry); -+ IMustLock(inode); -+ err = -ENOTDIR; -+ if (unlikely(!d_is_dir(dentry))) -+ goto out_unlock; /* possible? */ -+ -+ err = -ENOMEM; -+ args = au_whtmp_rmdir_alloc(dir->i_sb, GFP_NOFS); -+ if (unlikely(!args)) -+ goto out_unlock; -+ -+ parent = dentry->d_parent; /* dir inode is locked */ -+ di_write_lock_parent(parent); -+ err = au_test_empty(dentry, &args->whlist); -+ if (unlikely(err)) -+ goto out_parent; -+ -+ btop = au_dbtop(dentry); -+ bwh = au_dbwh(dentry); -+ bindex = -1; -+ wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/1, &bindex, &a->dt, -+ &a->pin); -+ err = PTR_ERR(wh_dentry); -+ if (IS_ERR(wh_dentry)) -+ goto out_parent; -+ -+ h_dentry = au_h_dptr(dentry, btop); -+ dget(h_dentry); -+ rmdir_later = 0; -+ if (bindex == btop) { -+ err = renwh_and_rmdir(dentry, btop, &args->whlist, dir); -+ if (err > 0) { -+ rmdir_later = err; -+ err = 0; -+ } -+ } else { -+ /* stop monitoring */ -+ au_hn_free(au_hi(inode, btop)); -+ -+ /* dir inode is locked */ -+ IMustLock(d_inode(wh_dentry->d_parent)); -+ err = 0; -+ } -+ -+ if (!err) { -+ vfsub_dead_dir(inode); -+ au_set_dbdiropq(dentry, -1); -+ epilog(dir, dentry, bindex); -+ -+ if (rmdir_later) { -+ au_whtmp_kick_rmdir(dir, btop, h_dentry, args); -+ args = NULL; -+ } -+ -+ goto out_unpin; /* success */ -+ } -+ -+ /* revert */ -+ AuLabel(revert); -+ if (wh_dentry) { -+ int rerr; -+ -+ rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, -+ &a->dt); -+ if (rerr) -+ err = rerr; -+ } -+ -+out_unpin: -+ au_unpin(&a->pin); -+ dput(wh_dentry); -+ dput(h_dentry); -+out_parent: -+ di_write_unlock(parent); -+ if (args) -+ au_whtmp_rmdir_free(args); -+out_unlock: -+ aufs_read_unlock(dentry, AuLock_DW); -+out_free: -+ au_kfree_rcu(a); -+out: -+ AuTraceErr(err); -+ return err; -+} -diff --git a/fs/aufs/i_op_ren.c b/fs/aufs/i_op_ren.c -new file mode 100644 -index 000000000000..91aa66594a42 ---- /dev/null -+++ b/fs/aufs/i_op_ren.c -@@ -0,0 +1,1250 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * inode operation (rename entry) -+ * todo: this is crazy monster -+ */ -+ -+#include <linux/iversion.h> -+#include "aufs.h" -+ -+enum { AuSRC, AuDST, AuSrcDst }; -+enum { AuPARENT, AuCHILD, AuParentChild }; -+ -+#define AuRen_ISDIR_SRC 1 -+#define AuRen_ISDIR_DST (1 << 1) -+#define AuRen_ISSAMEDIR (1 << 2) -+#define AuRen_WHSRC (1 << 3) -+#define AuRen_WHDST (1 << 4) -+#define AuRen_MNT_WRITE (1 << 5) -+#define AuRen_DT_DSTDIR (1 << 6) -+#define AuRen_DIROPQ_SRC (1 << 7) -+#define AuRen_DIROPQ_DST (1 << 8) -+#define AuRen_DIRREN (1 << 9) -+#define AuRen_DROPPED_SRC (1 << 10) -+#define AuRen_DROPPED_DST (1 << 11) -+#define au_ftest_ren(flags, name) ((flags) & AuRen_##name) -+#define au_fset_ren(flags, name) \ -+ do { (flags) |= AuRen_##name; } while (0) -+#define au_fclr_ren(flags, name) \ -+ do { (flags) &= ~AuRen_##name; } while (0) -+ -+#ifndef CONFIG_AUFS_DIRREN -+#undef AuRen_DIRREN -+#define AuRen_DIRREN 0 -+#endif -+ -+struct au_ren_args { -+ struct { -+ struct dentry *dentry, *h_dentry, *parent, *h_parent, -+ *wh_dentry; -+ struct inode *dir, *inode; -+ struct au_hinode *hdir, *hinode; -+ struct au_dtime dt[AuParentChild]; -+ aufs_bindex_t btop, bdiropq; -+ } sd[AuSrcDst]; -+ -+#define src_dentry sd[AuSRC].dentry -+#define src_dir sd[AuSRC].dir -+#define src_inode sd[AuSRC].inode -+#define src_h_dentry sd[AuSRC].h_dentry -+#define src_parent sd[AuSRC].parent -+#define src_h_parent sd[AuSRC].h_parent -+#define src_wh_dentry sd[AuSRC].wh_dentry -+#define src_hdir sd[AuSRC].hdir -+#define src_hinode sd[AuSRC].hinode -+#define src_h_dir sd[AuSRC].hdir->hi_inode -+#define src_dt sd[AuSRC].dt -+#define src_btop sd[AuSRC].btop -+#define src_bdiropq sd[AuSRC].bdiropq -+ -+#define dst_dentry sd[AuDST].dentry -+#define dst_dir sd[AuDST].dir -+#define dst_inode sd[AuDST].inode -+#define dst_h_dentry sd[AuDST].h_dentry -+#define dst_parent sd[AuDST].parent -+#define dst_h_parent sd[AuDST].h_parent -+#define dst_wh_dentry sd[AuDST].wh_dentry -+#define dst_hdir sd[AuDST].hdir -+#define dst_hinode sd[AuDST].hinode -+#define dst_h_dir sd[AuDST].hdir->hi_inode -+#define dst_dt sd[AuDST].dt -+#define dst_btop sd[AuDST].btop -+#define dst_bdiropq sd[AuDST].bdiropq -+ -+ struct dentry *h_trap; -+ struct au_branch *br; -+ struct path h_path; -+ struct au_nhash whlist; -+ aufs_bindex_t btgt, src_bwh; -+ -+ struct { -+ unsigned short auren_flags; -+ unsigned char flags; /* syscall parameter */ -+ unsigned char exchange; -+ } __packed; -+ -+ struct au_whtmp_rmdir *thargs; -+ struct dentry *h_dst; -+ struct au_hinode *h_root; -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * functions for reverting. -+ * when an error happened in a single rename systemcall, we should revert -+ * everything as if nothing happened. -+ * we don't need to revert the copied-up/down the parent dir since they are -+ * harmless. -+ */ -+ -+#define RevertFailure(fmt, ...) do { \ -+ AuIOErr("revert failure: " fmt " (%d, %d)\n", \ -+ ##__VA_ARGS__, err, rerr); \ -+ err = -EIO; \ -+} while (0) -+ -+static void au_ren_do_rev_diropq(int err, struct au_ren_args *a, int idx) -+{ -+ int rerr; -+ struct dentry *d; -+#define src_or_dst(member) a->sd[idx].member -+ -+ d = src_or_dst(dentry); /* {src,dst}_dentry */ -+ au_hn_inode_lock_nested(src_or_dst(hinode), AuLsc_I_CHILD); -+ rerr = au_diropq_remove(d, a->btgt); -+ au_hn_inode_unlock(src_or_dst(hinode)); -+ au_set_dbdiropq(d, src_or_dst(bdiropq)); -+ if (rerr) -+ RevertFailure("remove diropq %pd", d); -+ -+#undef src_or_dst_ -+} -+ -+static void au_ren_rev_diropq(int err, struct au_ren_args *a) -+{ -+ if (au_ftest_ren(a->auren_flags, DIROPQ_SRC)) -+ au_ren_do_rev_diropq(err, a, AuSRC); -+ if (au_ftest_ren(a->auren_flags, DIROPQ_DST)) -+ au_ren_do_rev_diropq(err, a, AuDST); -+} -+ -+static void au_ren_rev_rename(int err, struct au_ren_args *a) -+{ -+ int rerr; -+ struct inode *delegated; -+ -+ a->h_path.dentry = vfsub_lkup_one(&a->src_dentry->d_name, -+ a->src_h_parent); -+ rerr = PTR_ERR(a->h_path.dentry); -+ if (IS_ERR(a->h_path.dentry)) { -+ RevertFailure("lkup one %pd", a->src_dentry); -+ return; -+ } -+ -+ delegated = NULL; -+ rerr = vfsub_rename(a->dst_h_dir, -+ au_h_dptr(a->src_dentry, a->btgt), -+ a->src_h_dir, &a->h_path, &delegated, a->flags); -+ if (unlikely(rerr == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal rename\n"); -+ iput(delegated); -+ } -+ d_drop(a->h_path.dentry); -+ dput(a->h_path.dentry); -+ /* au_set_h_dptr(a->src_dentry, a->btgt, NULL); */ -+ if (rerr) -+ RevertFailure("rename %pd", a->src_dentry); -+} -+ -+static void au_ren_rev_whtmp(int err, struct au_ren_args *a) -+{ -+ int rerr; -+ struct inode *delegated; -+ -+ a->h_path.dentry = vfsub_lkup_one(&a->dst_dentry->d_name, -+ a->dst_h_parent); -+ rerr = PTR_ERR(a->h_path.dentry); -+ if (IS_ERR(a->h_path.dentry)) { -+ RevertFailure("lkup one %pd", a->dst_dentry); -+ return; -+ } -+ if (d_is_positive(a->h_path.dentry)) { -+ d_drop(a->h_path.dentry); -+ dput(a->h_path.dentry); -+ return; -+ } -+ -+ delegated = NULL; -+ rerr = vfsub_rename(a->dst_h_dir, a->h_dst, a->dst_h_dir, &a->h_path, -+ &delegated, a->flags); -+ if (unlikely(rerr == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal rename\n"); -+ iput(delegated); -+ } -+ d_drop(a->h_path.dentry); -+ dput(a->h_path.dentry); -+ if (!rerr) -+ au_set_h_dptr(a->dst_dentry, a->btgt, dget(a->h_dst)); -+ else -+ RevertFailure("rename %pd", a->h_dst); -+} -+ -+static void au_ren_rev_whsrc(int err, struct au_ren_args *a) -+{ -+ int rerr; -+ -+ a->h_path.dentry = a->src_wh_dentry; -+ rerr = au_wh_unlink_dentry(a->src_h_dir, &a->h_path, a->src_dentry); -+ au_set_dbwh(a->src_dentry, a->src_bwh); -+ if (rerr) -+ RevertFailure("unlink %pd", a->src_wh_dentry); -+} -+#undef RevertFailure -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * when we have to copyup the renaming entry, do it with the rename-target name -+ * in order to minimize the cost (the later actual rename is unnecessary). -+ * otherwise rename it on the target branch. -+ */ -+static int au_ren_or_cpup(struct au_ren_args *a) -+{ -+ int err; -+ struct dentry *d; -+ struct inode *delegated; -+ -+ d = a->src_dentry; -+ if (au_dbtop(d) == a->btgt) { -+ a->h_path.dentry = a->dst_h_dentry; -+ AuDebugOn(au_dbtop(d) != a->btgt); -+ delegated = NULL; -+ err = vfsub_rename(a->src_h_dir, au_h_dptr(d, a->btgt), -+ a->dst_h_dir, &a->h_path, &delegated, -+ a->flags); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal rename\n"); -+ iput(delegated); -+ } -+ } else -+ BUG(); -+ -+ if (!err && a->h_dst) -+ /* it will be set to dinfo later */ -+ dget(a->h_dst); -+ -+ return err; -+} -+ -+/* cf. aufs_rmdir() */ -+static int au_ren_del_whtmp(struct au_ren_args *a) -+{ -+ int err; -+ struct inode *dir; -+ -+ dir = a->dst_dir; -+ SiMustAnyLock(dir->i_sb); -+ if (!au_nhash_test_longer_wh(&a->whlist, a->btgt, -+ au_sbi(dir->i_sb)->si_dirwh) -+ || au_test_fs_remote(a->h_dst->d_sb)) { -+ err = au_whtmp_rmdir(dir, a->btgt, a->h_dst, &a->whlist); -+ if (unlikely(err)) -+ pr_warn("failed removing whtmp dir %pd (%d), " -+ "ignored.\n", a->h_dst, err); -+ } else { -+ au_nhash_wh_free(&a->thargs->whlist); -+ a->thargs->whlist = a->whlist; -+ a->whlist.nh_num = 0; -+ au_whtmp_kick_rmdir(dir, a->btgt, a->h_dst, a->thargs); -+ dput(a->h_dst); -+ a->thargs = NULL; -+ } -+ -+ return 0; -+} -+ -+/* make it 'opaque' dir. */ -+static int au_ren_do_diropq(struct au_ren_args *a, int idx) -+{ -+ int err; -+ struct dentry *d, *diropq; -+#define src_or_dst(member) a->sd[idx].member -+ -+ err = 0; -+ d = src_or_dst(dentry); /* {src,dst}_dentry */ -+ src_or_dst(bdiropq) = au_dbdiropq(d); -+ src_or_dst(hinode) = au_hi(src_or_dst(inode), a->btgt); -+ au_hn_inode_lock_nested(src_or_dst(hinode), AuLsc_I_CHILD); -+ diropq = au_diropq_create(d, a->btgt); -+ au_hn_inode_unlock(src_or_dst(hinode)); -+ if (IS_ERR(diropq)) -+ err = PTR_ERR(diropq); -+ else -+ dput(diropq); -+ -+#undef src_or_dst_ -+ return err; -+} -+ -+static int au_ren_diropq(struct au_ren_args *a) -+{ -+ int err; -+ unsigned char always; -+ struct dentry *d; -+ -+ err = 0; -+ d = a->dst_dentry; /* already renamed on the branch */ -+ always = !!au_opt_test(au_mntflags(d->d_sb), ALWAYS_DIROPQ); -+ if (au_ftest_ren(a->auren_flags, ISDIR_SRC) -+ && !au_ftest_ren(a->auren_flags, DIRREN) -+ && a->btgt != au_dbdiropq(a->src_dentry) -+ && (a->dst_wh_dentry -+ || a->btgt <= au_dbdiropq(d) -+ /* hide the lower to keep xino */ -+ /* the lowers may not be a dir, but we hide them anyway */ -+ || a->btgt < au_dbbot(d) -+ || always)) { -+ AuDbg("here\n"); -+ err = au_ren_do_diropq(a, AuSRC); -+ if (unlikely(err)) -+ goto out; -+ au_fset_ren(a->auren_flags, DIROPQ_SRC); -+ } -+ if (!a->exchange) -+ goto out; /* success */ -+ -+ d = a->src_dentry; /* already renamed on the branch */ -+ if (au_ftest_ren(a->auren_flags, ISDIR_DST) -+ && a->btgt != au_dbdiropq(a->dst_dentry) -+ && (a->btgt < au_dbdiropq(d) -+ || a->btgt < au_dbbot(d) -+ || always)) { -+ AuDbgDentry(a->src_dentry); -+ AuDbgDentry(a->dst_dentry); -+ err = au_ren_do_diropq(a, AuDST); -+ if (unlikely(err)) -+ goto out_rev_src; -+ au_fset_ren(a->auren_flags, DIROPQ_DST); -+ } -+ goto out; /* success */ -+ -+out_rev_src: -+ AuDbg("err %d, reverting src\n", err); -+ au_ren_rev_diropq(err, a); -+out: -+ return err; -+} -+ -+static int do_rename(struct au_ren_args *a) -+{ -+ int err; -+ struct dentry *d, *h_d; -+ -+ if (!a->exchange) { -+ /* prepare workqueue args for asynchronous rmdir */ -+ h_d = a->dst_h_dentry; -+ if (au_ftest_ren(a->auren_flags, ISDIR_DST) -+ /* && !au_ftest_ren(a->auren_flags, DIRREN) */ -+ && d_is_positive(h_d)) { -+ err = -ENOMEM; -+ a->thargs = au_whtmp_rmdir_alloc(a->src_dentry->d_sb, -+ GFP_NOFS); -+ if (unlikely(!a->thargs)) -+ goto out; -+ a->h_dst = dget(h_d); -+ } -+ -+ /* create whiteout for src_dentry */ -+ if (au_ftest_ren(a->auren_flags, WHSRC)) { -+ a->src_bwh = au_dbwh(a->src_dentry); -+ AuDebugOn(a->src_bwh >= 0); -+ a->src_wh_dentry = au_wh_create(a->src_dentry, a->btgt, -+ a->src_h_parent); -+ err = PTR_ERR(a->src_wh_dentry); -+ if (IS_ERR(a->src_wh_dentry)) -+ goto out_thargs; -+ } -+ -+ /* lookup whiteout for dentry */ -+ if (au_ftest_ren(a->auren_flags, WHDST)) { -+ h_d = au_wh_lkup(a->dst_h_parent, -+ &a->dst_dentry->d_name, a->br); -+ err = PTR_ERR(h_d); -+ if (IS_ERR(h_d)) -+ goto out_whsrc; -+ if (d_is_negative(h_d)) -+ dput(h_d); -+ else -+ a->dst_wh_dentry = h_d; -+ } -+ -+ /* rename dentry to tmpwh */ -+ if (a->thargs) { -+ err = au_whtmp_ren(a->dst_h_dentry, a->br); -+ if (unlikely(err)) -+ goto out_whdst; -+ -+ d = a->dst_dentry; -+ au_set_h_dptr(d, a->btgt, NULL); -+ err = au_lkup_neg(d, a->btgt, /*wh*/0); -+ if (unlikely(err)) -+ goto out_whtmp; -+ a->dst_h_dentry = au_h_dptr(d, a->btgt); -+ } -+ } -+ -+ BUG_ON(d_is_positive(a->dst_h_dentry) && a->src_btop != a->btgt); -+#if 0 -+ BUG_ON(!au_ftest_ren(a->auren_flags, DIRREN) -+ && d_is_positive(a->dst_h_dentry) -+ && a->src_btop != a->btgt); -+#endif -+ -+ /* rename by vfs_rename or cpup */ -+ err = au_ren_or_cpup(a); -+ if (unlikely(err)) -+ /* leave the copied-up one */ -+ goto out_whtmp; -+ -+ /* make dir opaque */ -+ err = au_ren_diropq(a); -+ if (unlikely(err)) -+ goto out_rename; -+ -+ /* update target timestamps */ -+ if (a->exchange) { -+ AuDebugOn(au_dbtop(a->dst_dentry) != a->btgt); -+ a->h_path.dentry = au_h_dptr(a->dst_dentry, a->btgt); -+ vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/ -+ a->dst_inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime; -+ } -+ AuDebugOn(au_dbtop(a->src_dentry) != a->btgt); -+ a->h_path.dentry = au_h_dptr(a->src_dentry, a->btgt); -+ vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/ -+ a->src_inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime; -+ -+ if (!a->exchange) { -+ /* remove whiteout for dentry */ -+ if (a->dst_wh_dentry) { -+ a->h_path.dentry = a->dst_wh_dentry; -+ err = au_wh_unlink_dentry(a->dst_h_dir, &a->h_path, -+ a->dst_dentry); -+ if (unlikely(err)) -+ goto out_diropq; -+ } -+ -+ /* remove whtmp */ -+ if (a->thargs) -+ au_ren_del_whtmp(a); /* ignore this error */ -+ -+ au_fhsm_wrote(a->src_dentry->d_sb, a->btgt, /*force*/0); -+ } -+ err = 0; -+ goto out_success; -+ -+out_diropq: -+ au_ren_rev_diropq(err, a); -+out_rename: -+ au_ren_rev_rename(err, a); -+ dput(a->h_dst); -+out_whtmp: -+ if (a->thargs) -+ au_ren_rev_whtmp(err, a); -+out_whdst: -+ dput(a->dst_wh_dentry); -+ a->dst_wh_dentry = NULL; -+out_whsrc: -+ if (a->src_wh_dentry) -+ au_ren_rev_whsrc(err, a); -+out_success: -+ dput(a->src_wh_dentry); -+ dput(a->dst_wh_dentry); -+out_thargs: -+ if (a->thargs) { -+ dput(a->h_dst); -+ au_whtmp_rmdir_free(a->thargs); -+ a->thargs = NULL; -+ } -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * test if @dentry dir can be rename destination or not. -+ * success means, it is a logically empty dir. -+ */ -+static int may_rename_dstdir(struct dentry *dentry, struct au_nhash *whlist) -+{ -+ return au_test_empty(dentry, whlist); -+} -+ -+/* -+ * test if @a->src_dentry dir can be rename source or not. -+ * if it can, return 0. -+ * success means, -+ * - it is a logically empty dir. -+ * - or, it exists on writable branch and has no children including whiteouts -+ * on the lower branch unless DIRREN is on. -+ */ -+static int may_rename_srcdir(struct au_ren_args *a) -+{ -+ int err; -+ unsigned int rdhash; -+ aufs_bindex_t btop, btgt; -+ struct dentry *dentry; -+ struct super_block *sb; -+ struct au_sbinfo *sbinfo; -+ -+ dentry = a->src_dentry; -+ sb = dentry->d_sb; -+ sbinfo = au_sbi(sb); -+ if (au_opt_test(sbinfo->si_mntflags, DIRREN)) -+ au_fset_ren(a->auren_flags, DIRREN); -+ -+ btgt = a->btgt; -+ btop = au_dbtop(dentry); -+ if (btop != btgt) { -+ struct au_nhash whlist; -+ -+ SiMustAnyLock(sb); -+ rdhash = sbinfo->si_rdhash; -+ if (!rdhash) -+ rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, -+ dentry)); -+ err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS); -+ if (unlikely(err)) -+ goto out; -+ err = au_test_empty(dentry, &whlist); -+ au_nhash_wh_free(&whlist); -+ goto out; -+ } -+ -+ if (btop == au_dbtaildir(dentry)) -+ return 0; /* success */ -+ -+ err = au_test_empty_lower(dentry); -+ -+out: -+ if (err == -ENOTEMPTY) { -+ if (au_ftest_ren(a->auren_flags, DIRREN)) { -+ err = 0; -+ } else { -+ AuWarn1("renaming dir who has child(ren) on multiple " -+ "branches, is not supported\n"); -+ err = -EXDEV; -+ } -+ } -+ return err; -+} -+ -+/* side effect: sets whlist and h_dentry */ -+static int au_ren_may_dir(struct au_ren_args *a) -+{ -+ int err; -+ unsigned int rdhash; -+ struct dentry *d; -+ -+ d = a->dst_dentry; -+ SiMustAnyLock(d->d_sb); -+ -+ err = 0; -+ if (au_ftest_ren(a->auren_flags, ISDIR_DST) && a->dst_inode) { -+ rdhash = au_sbi(d->d_sb)->si_rdhash; -+ if (!rdhash) -+ rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, d)); -+ err = au_nhash_alloc(&a->whlist, rdhash, GFP_NOFS); -+ if (unlikely(err)) -+ goto out; -+ -+ if (!a->exchange) { -+ au_set_dbtop(d, a->dst_btop); -+ err = may_rename_dstdir(d, &a->whlist); -+ au_set_dbtop(d, a->btgt); -+ } else -+ err = may_rename_srcdir(a); -+ } -+ a->dst_h_dentry = au_h_dptr(d, au_dbtop(d)); -+ if (unlikely(err)) -+ goto out; -+ -+ d = a->src_dentry; -+ a->src_h_dentry = au_h_dptr(d, au_dbtop(d)); -+ if (au_ftest_ren(a->auren_flags, ISDIR_SRC)) { -+ err = may_rename_srcdir(a); -+ if (unlikely(err)) { -+ au_nhash_wh_free(&a->whlist); -+ a->whlist.nh_num = 0; -+ } -+ } -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * simple tests for rename. -+ * following the checks in vfs, plus the parent-child relationship. -+ */ -+static int au_may_ren(struct au_ren_args *a) -+{ -+ int err, isdir; -+ struct inode *h_inode; -+ -+ if (a->src_btop == a->btgt) { -+ err = au_may_del(a->src_dentry, a->btgt, a->src_h_parent, -+ au_ftest_ren(a->auren_flags, ISDIR_SRC)); -+ if (unlikely(err)) -+ goto out; -+ err = -EINVAL; -+ if (unlikely(a->src_h_dentry == a->h_trap)) -+ goto out; -+ } -+ -+ err = 0; -+ if (a->dst_btop != a->btgt) -+ goto out; -+ -+ err = -ENOTEMPTY; -+ if (unlikely(a->dst_h_dentry == a->h_trap)) -+ goto out; -+ -+ err = -EIO; -+ isdir = !!au_ftest_ren(a->auren_flags, ISDIR_DST); -+ if (d_really_is_negative(a->dst_dentry)) { -+ if (d_is_negative(a->dst_h_dentry)) -+ err = au_may_add(a->dst_dentry, a->btgt, -+ a->dst_h_parent, isdir); -+ } else { -+ if (unlikely(d_is_negative(a->dst_h_dentry))) -+ goto out; -+ h_inode = d_inode(a->dst_h_dentry); -+ if (h_inode->i_nlink) -+ err = au_may_del(a->dst_dentry, a->btgt, -+ a->dst_h_parent, isdir); -+ } -+ -+out: -+ if (unlikely(err == -ENOENT || err == -EEXIST)) -+ err = -EIO; -+ AuTraceErr(err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * locking order -+ * (VFS) -+ * - src_dir and dir by lock_rename() -+ * - inode if exists -+ * (aufs) -+ * - lock all -+ * + src_dentry and dentry by aufs_read_and_write_lock2() which calls, -+ * + si_read_lock -+ * + di_write_lock2_child() -+ * + di_write_lock_child() -+ * + ii_write_lock_child() -+ * + di_write_lock_child2() -+ * + ii_write_lock_child2() -+ * + src_parent and parent -+ * + di_write_lock_parent() -+ * + ii_write_lock_parent() -+ * + di_write_lock_parent2() -+ * + ii_write_lock_parent2() -+ * + lower src_dir and dir by vfsub_lock_rename() -+ * + verify the every relationships between child and parent. if any -+ * of them failed, unlock all and return -EBUSY. -+ */ -+static void au_ren_unlock(struct au_ren_args *a) -+{ -+ vfsub_unlock_rename(a->src_h_parent, a->src_hdir, -+ a->dst_h_parent, a->dst_hdir); -+ if (au_ftest_ren(a->auren_flags, DIRREN) -+ && a->h_root) -+ au_hn_inode_unlock(a->h_root); -+ if (au_ftest_ren(a->auren_flags, MNT_WRITE)) -+ vfsub_mnt_drop_write(au_br_mnt(a->br)); -+} -+ -+static int au_ren_lock(struct au_ren_args *a) -+{ -+ int err; -+ unsigned int udba; -+ -+ err = 0; -+ a->src_h_parent = au_h_dptr(a->src_parent, a->btgt); -+ a->src_hdir = au_hi(a->src_dir, a->btgt); -+ a->dst_h_parent = au_h_dptr(a->dst_parent, a->btgt); -+ a->dst_hdir = au_hi(a->dst_dir, a->btgt); -+ -+ err = vfsub_mnt_want_write(au_br_mnt(a->br)); -+ if (unlikely(err)) -+ goto out; -+ au_fset_ren(a->auren_flags, MNT_WRITE); -+ if (au_ftest_ren(a->auren_flags, DIRREN)) { -+ struct dentry *root; -+ struct inode *dir; -+ -+ /* -+ * sbinfo is already locked, so this ii_read_lock is -+ * unnecessary. but our debugging feature checks it. -+ */ -+ root = a->src_inode->i_sb->s_root; -+ if (root != a->src_parent && root != a->dst_parent) { -+ dir = d_inode(root); -+ ii_read_lock_parent3(dir); -+ a->h_root = au_hi(dir, a->btgt); -+ ii_read_unlock(dir); -+ au_hn_inode_lock_nested(a->h_root, AuLsc_I_PARENT3); -+ } -+ } -+ a->h_trap = vfsub_lock_rename(a->src_h_parent, a->src_hdir, -+ a->dst_h_parent, a->dst_hdir); -+ udba = au_opt_udba(a->src_dentry->d_sb); -+ if (unlikely(a->src_hdir->hi_inode != d_inode(a->src_h_parent) -+ || a->dst_hdir->hi_inode != d_inode(a->dst_h_parent))) -+ err = au_busy_or_stale(); -+ if (!err && au_dbtop(a->src_dentry) == a->btgt) -+ err = au_h_verify(a->src_h_dentry, udba, -+ d_inode(a->src_h_parent), a->src_h_parent, -+ a->br); -+ if (!err && au_dbtop(a->dst_dentry) == a->btgt) -+ err = au_h_verify(a->dst_h_dentry, udba, -+ d_inode(a->dst_h_parent), a->dst_h_parent, -+ a->br); -+ if (!err) -+ goto out; /* success */ -+ -+ err = au_busy_or_stale(); -+ au_ren_unlock(a); -+ -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static void au_ren_refresh_dir(struct au_ren_args *a) -+{ -+ struct inode *dir; -+ -+ dir = a->dst_dir; -+ inode_inc_iversion(dir); -+ if (au_ftest_ren(a->auren_flags, ISDIR_SRC)) { -+ /* is this updating defined in POSIX? */ -+ au_cpup_attr_timesizes(a->src_inode); -+ au_cpup_attr_nlink(dir, /*force*/1); -+ } -+ au_dir_ts(dir, a->btgt); -+ -+ if (a->exchange) { -+ dir = a->src_dir; -+ inode_inc_iversion(dir); -+ if (au_ftest_ren(a->auren_flags, ISDIR_DST)) { -+ /* is this updating defined in POSIX? */ -+ au_cpup_attr_timesizes(a->dst_inode); -+ au_cpup_attr_nlink(dir, /*force*/1); -+ } -+ au_dir_ts(dir, a->btgt); -+ } -+ -+ if (au_ftest_ren(a->auren_flags, ISSAMEDIR)) -+ return; -+ -+ dir = a->src_dir; -+ inode_inc_iversion(dir); -+ if (au_ftest_ren(a->auren_flags, ISDIR_SRC)) -+ au_cpup_attr_nlink(dir, /*force*/1); -+ au_dir_ts(dir, a->btgt); -+} -+ -+static void au_ren_refresh(struct au_ren_args *a) -+{ -+ aufs_bindex_t bbot, bindex; -+ struct dentry *d, *h_d; -+ struct inode *i, *h_i; -+ struct super_block *sb; -+ -+ d = a->dst_dentry; -+ d_drop(d); -+ if (a->h_dst) -+ /* already dget-ed by au_ren_or_cpup() */ -+ au_set_h_dptr(d, a->btgt, a->h_dst); -+ -+ i = a->dst_inode; -+ if (i) { -+ if (!a->exchange) { -+ if (!au_ftest_ren(a->auren_flags, ISDIR_DST)) -+ vfsub_drop_nlink(i); -+ else { -+ vfsub_dead_dir(i); -+ au_cpup_attr_timesizes(i); -+ } -+ au_update_dbrange(d, /*do_put_zero*/1); -+ } else -+ au_cpup_attr_nlink(i, /*force*/1); -+ } else { -+ bbot = a->btgt; -+ for (bindex = au_dbtop(d); bindex < bbot; bindex++) -+ au_set_h_dptr(d, bindex, NULL); -+ bbot = au_dbbot(d); -+ for (bindex = a->btgt + 1; bindex <= bbot; bindex++) -+ au_set_h_dptr(d, bindex, NULL); -+ au_update_dbrange(d, /*do_put_zero*/0); -+ } -+ -+ if (a->exchange -+ || au_ftest_ren(a->auren_flags, DIRREN)) { -+ d_drop(a->src_dentry); -+ if (au_ftest_ren(a->auren_flags, DIRREN)) -+ au_set_dbwh(a->src_dentry, -1); -+ return; -+ } -+ -+ d = a->src_dentry; -+ au_set_dbwh(d, -1); -+ bbot = au_dbbot(d); -+ for (bindex = a->btgt + 1; bindex <= bbot; bindex++) { -+ h_d = au_h_dptr(d, bindex); -+ if (h_d) -+ au_set_h_dptr(d, bindex, NULL); -+ } -+ au_set_dbbot(d, a->btgt); -+ -+ sb = d->d_sb; -+ i = a->src_inode; -+ if (au_opt_test(au_mntflags(sb), PLINK) && au_plink_test(i)) -+ return; /* success */ -+ -+ bbot = au_ibbot(i); -+ for (bindex = a->btgt + 1; bindex <= bbot; bindex++) { -+ h_i = au_h_iptr(i, bindex); -+ if (h_i) { -+ au_xino_write(sb, bindex, h_i->i_ino, /*ino*/0); -+ /* ignore this error */ -+ au_set_h_iptr(i, bindex, NULL, 0); -+ } -+ } -+ au_set_ibbot(i, a->btgt); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* mainly for link(2) and rename(2) */ -+int au_wbr(struct dentry *dentry, aufs_bindex_t btgt) -+{ -+ aufs_bindex_t bdiropq, bwh; -+ struct dentry *parent; -+ struct au_branch *br; -+ -+ parent = dentry->d_parent; -+ IMustLock(d_inode(parent)); /* dir is locked */ -+ -+ bdiropq = au_dbdiropq(parent); -+ bwh = au_dbwh(dentry); -+ br = au_sbr(dentry->d_sb, btgt); -+ if (au_br_rdonly(br) -+ || (0 <= bdiropq && bdiropq < btgt) -+ || (0 <= bwh && bwh < btgt)) -+ btgt = -1; -+ -+ AuDbg("btgt %d\n", btgt); -+ return btgt; -+} -+ -+/* sets src_btop, dst_btop and btgt */ -+static int au_ren_wbr(struct au_ren_args *a) -+{ -+ int err; -+ struct au_wr_dir_args wr_dir_args = { -+ /* .force_btgt = -1, */ -+ .flags = AuWrDir_ADD_ENTRY -+ }; -+ -+ a->src_btop = au_dbtop(a->src_dentry); -+ a->dst_btop = au_dbtop(a->dst_dentry); -+ if (au_ftest_ren(a->auren_flags, ISDIR_SRC) -+ || au_ftest_ren(a->auren_flags, ISDIR_DST)) -+ au_fset_wrdir(wr_dir_args.flags, ISDIR); -+ wr_dir_args.force_btgt = a->src_btop; -+ if (a->dst_inode && a->dst_btop < a->src_btop) -+ wr_dir_args.force_btgt = a->dst_btop; -+ wr_dir_args.force_btgt = au_wbr(a->dst_dentry, wr_dir_args.force_btgt); -+ err = au_wr_dir(a->dst_dentry, a->src_dentry, &wr_dir_args); -+ a->btgt = err; -+ if (a->exchange) -+ au_update_dbtop(a->dst_dentry); -+ -+ return err; -+} -+ -+static void au_ren_dt(struct au_ren_args *a) -+{ -+ a->h_path.dentry = a->src_h_parent; -+ au_dtime_store(a->src_dt + AuPARENT, a->src_parent, &a->h_path); -+ if (!au_ftest_ren(a->auren_flags, ISSAMEDIR)) { -+ a->h_path.dentry = a->dst_h_parent; -+ au_dtime_store(a->dst_dt + AuPARENT, a->dst_parent, &a->h_path); -+ } -+ -+ au_fclr_ren(a->auren_flags, DT_DSTDIR); -+ if (!au_ftest_ren(a->auren_flags, ISDIR_SRC) -+ && !a->exchange) -+ return; -+ -+ a->h_path.dentry = a->src_h_dentry; -+ au_dtime_store(a->src_dt + AuCHILD, a->src_dentry, &a->h_path); -+ if (d_is_positive(a->dst_h_dentry)) { -+ au_fset_ren(a->auren_flags, DT_DSTDIR); -+ a->h_path.dentry = a->dst_h_dentry; -+ au_dtime_store(a->dst_dt + AuCHILD, a->dst_dentry, &a->h_path); -+ } -+} -+ -+static void au_ren_rev_dt(int err, struct au_ren_args *a) -+{ -+ struct dentry *h_d; -+ struct inode *h_inode; -+ -+ au_dtime_revert(a->src_dt + AuPARENT); -+ if (!au_ftest_ren(a->auren_flags, ISSAMEDIR)) -+ au_dtime_revert(a->dst_dt + AuPARENT); -+ -+ if (au_ftest_ren(a->auren_flags, ISDIR_SRC) && err != -EIO) { -+ h_d = a->src_dt[AuCHILD].dt_h_path.dentry; -+ h_inode = d_inode(h_d); -+ inode_lock_nested(h_inode, AuLsc_I_CHILD); -+ au_dtime_revert(a->src_dt + AuCHILD); -+ inode_unlock(h_inode); -+ -+ if (au_ftest_ren(a->auren_flags, DT_DSTDIR)) { -+ h_d = a->dst_dt[AuCHILD].dt_h_path.dentry; -+ h_inode = d_inode(h_d); -+ inode_lock_nested(h_inode, AuLsc_I_CHILD); -+ au_dtime_revert(a->dst_dt + AuCHILD); -+ inode_unlock(h_inode); -+ } -+ } -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int aufs_rename(struct inode *_src_dir, struct dentry *_src_dentry, -+ struct inode *_dst_dir, struct dentry *_dst_dentry, -+ unsigned int _flags) -+{ -+ int err, lock_flags; -+ void *rev; -+ /* reduce stack space */ -+ struct au_ren_args *a; -+ struct au_pin pin; -+ -+ AuDbg("%pd, %pd, 0x%x\n", _src_dentry, _dst_dentry, _flags); -+ IMustLock(_src_dir); -+ IMustLock(_dst_dir); -+ -+ err = -EINVAL; -+ if (unlikely(_flags & RENAME_WHITEOUT)) -+ goto out; -+ -+ err = -ENOMEM; -+ BUILD_BUG_ON(sizeof(*a) > PAGE_SIZE); -+ a = kzalloc(sizeof(*a), GFP_NOFS); -+ if (unlikely(!a)) -+ goto out; -+ -+ a->flags = _flags; -+ BUILD_BUG_ON(sizeof(a->exchange) == sizeof(u8) -+ && RENAME_EXCHANGE > U8_MAX); -+ a->exchange = _flags & RENAME_EXCHANGE; -+ a->src_dir = _src_dir; -+ a->src_dentry = _src_dentry; -+ a->src_inode = NULL; -+ if (d_really_is_positive(a->src_dentry)) -+ a->src_inode = d_inode(a->src_dentry); -+ a->src_parent = a->src_dentry->d_parent; /* dir inode is locked */ -+ a->dst_dir = _dst_dir; -+ a->dst_dentry = _dst_dentry; -+ a->dst_inode = NULL; -+ if (d_really_is_positive(a->dst_dentry)) -+ a->dst_inode = d_inode(a->dst_dentry); -+ a->dst_parent = a->dst_dentry->d_parent; /* dir inode is locked */ -+ if (a->dst_inode) { -+ /* -+ * if EXCHANGE && src is non-dir && dst is dir, -+ * dst is not locked. -+ */ -+ /* IMustLock(a->dst_inode); */ -+ au_igrab(a->dst_inode); -+ } -+ -+ err = -ENOTDIR; -+ lock_flags = AuLock_FLUSH | AuLock_NOPLM | AuLock_GEN; -+ if (d_is_dir(a->src_dentry)) { -+ au_fset_ren(a->auren_flags, ISDIR_SRC); -+ if (unlikely(!a->exchange -+ && d_really_is_positive(a->dst_dentry) -+ && !d_is_dir(a->dst_dentry))) -+ goto out_free; -+ lock_flags |= AuLock_DIRS; -+ } -+ if (a->dst_inode && d_is_dir(a->dst_dentry)) { -+ au_fset_ren(a->auren_flags, ISDIR_DST); -+ if (unlikely(!a->exchange -+ && d_really_is_positive(a->src_dentry) -+ && !d_is_dir(a->src_dentry))) -+ goto out_free; -+ lock_flags |= AuLock_DIRS; -+ } -+ err = aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry, -+ lock_flags); -+ if (unlikely(err)) -+ goto out_free; -+ -+ err = au_d_hashed_positive(a->src_dentry); -+ if (unlikely(err)) -+ goto out_unlock; -+ err = -ENOENT; -+ if (a->dst_inode) { -+ /* -+ * If it is a dir, VFS unhash it before this -+ * function. It means we cannot rely upon d_unhashed(). -+ */ -+ if (unlikely(!a->dst_inode->i_nlink)) -+ goto out_unlock; -+ if (!au_ftest_ren(a->auren_flags, ISDIR_DST)) { -+ err = au_d_hashed_positive(a->dst_dentry); -+ if (unlikely(err && !a->exchange)) -+ goto out_unlock; -+ } else if (unlikely(IS_DEADDIR(a->dst_inode))) -+ goto out_unlock; -+ } else if (unlikely(d_unhashed(a->dst_dentry))) -+ goto out_unlock; -+ -+ /* -+ * is it possible? -+ * yes, it happened (in linux-3.3-rcN) but I don't know why. -+ * there may exist a problem somewhere else. -+ */ -+ err = -EINVAL; -+ if (unlikely(d_inode(a->dst_parent) == d_inode(a->src_dentry))) -+ goto out_unlock; -+ -+ au_fset_ren(a->auren_flags, ISSAMEDIR); /* temporary */ -+ di_write_lock_parent(a->dst_parent); -+ -+ /* which branch we process */ -+ err = au_ren_wbr(a); -+ if (unlikely(err < 0)) -+ goto out_parent; -+ a->br = au_sbr(a->dst_dentry->d_sb, a->btgt); -+ a->h_path.mnt = au_br_mnt(a->br); -+ -+ /* are they available to be renamed */ -+ err = au_ren_may_dir(a); -+ if (unlikely(err)) -+ goto out_children; -+ -+ /* prepare the writable parent dir on the same branch */ -+ if (a->dst_btop == a->btgt) { -+ au_fset_ren(a->auren_flags, WHDST); -+ } else { -+ err = au_cpup_dirs(a->dst_dentry, a->btgt); -+ if (unlikely(err)) -+ goto out_children; -+ } -+ -+ err = 0; -+ if (!a->exchange) { -+ if (a->src_dir != a->dst_dir) { -+ /* -+ * this temporary unlock is safe, -+ * because both dir->i_mutex are locked. -+ */ -+ di_write_unlock(a->dst_parent); -+ di_write_lock_parent(a->src_parent); -+ err = au_wr_dir_need_wh(a->src_dentry, -+ au_ftest_ren(a->auren_flags, -+ ISDIR_SRC), -+ &a->btgt); -+ di_write_unlock(a->src_parent); -+ di_write_lock2_parent(a->src_parent, a->dst_parent, -+ /*isdir*/1); -+ au_fclr_ren(a->auren_flags, ISSAMEDIR); -+ } else -+ err = au_wr_dir_need_wh(a->src_dentry, -+ au_ftest_ren(a->auren_flags, -+ ISDIR_SRC), -+ &a->btgt); -+ } -+ if (unlikely(err < 0)) -+ goto out_children; -+ if (err) -+ au_fset_ren(a->auren_flags, WHSRC); -+ -+ /* cpup src */ -+ if (a->src_btop != a->btgt) { -+ err = au_pin(&pin, a->src_dentry, a->btgt, -+ au_opt_udba(a->src_dentry->d_sb), -+ AuPin_DI_LOCKED | AuPin_MNT_WRITE); -+ if (!err) { -+ struct au_cp_generic cpg = { -+ .dentry = a->src_dentry, -+ .bdst = a->btgt, -+ .bsrc = a->src_btop, -+ .len = -1, -+ .pin = &pin, -+ .flags = AuCpup_DTIME | AuCpup_HOPEN -+ }; -+ AuDebugOn(au_dbtop(a->src_dentry) != a->src_btop); -+ err = au_sio_cpup_simple(&cpg); -+ au_unpin(&pin); -+ } -+ if (unlikely(err)) -+ goto out_children; -+ a->src_btop = a->btgt; -+ a->src_h_dentry = au_h_dptr(a->src_dentry, a->btgt); -+ if (!a->exchange) -+ au_fset_ren(a->auren_flags, WHSRC); -+ } -+ -+ /* cpup dst */ -+ if (a->exchange && a->dst_inode -+ && a->dst_btop != a->btgt) { -+ err = au_pin(&pin, a->dst_dentry, a->btgt, -+ au_opt_udba(a->dst_dentry->d_sb), -+ AuPin_DI_LOCKED | AuPin_MNT_WRITE); -+ if (!err) { -+ struct au_cp_generic cpg = { -+ .dentry = a->dst_dentry, -+ .bdst = a->btgt, -+ .bsrc = a->dst_btop, -+ .len = -1, -+ .pin = &pin, -+ .flags = AuCpup_DTIME | AuCpup_HOPEN -+ }; -+ err = au_sio_cpup_simple(&cpg); -+ au_unpin(&pin); -+ } -+ if (unlikely(err)) -+ goto out_children; -+ a->dst_btop = a->btgt; -+ a->dst_h_dentry = au_h_dptr(a->dst_dentry, a->btgt); -+ } -+ -+ /* lock them all */ -+ err = au_ren_lock(a); -+ if (unlikely(err)) -+ /* leave the copied-up one */ -+ goto out_children; -+ -+ if (!a->exchange) { -+ if (!au_opt_test(au_mntflags(a->dst_dir->i_sb), UDBA_NONE)) -+ err = au_may_ren(a); -+ else if (unlikely(a->dst_dentry->d_name.len > AUFS_MAX_NAMELEN)) -+ err = -ENAMETOOLONG; -+ if (unlikely(err)) -+ goto out_hdir; -+ } -+ -+ /* store timestamps to be revertible */ -+ au_ren_dt(a); -+ -+ /* store dirren info */ -+ if (au_ftest_ren(a->auren_flags, DIRREN)) { -+ err = au_dr_rename(a->src_dentry, a->btgt, -+ &a->dst_dentry->d_name, &rev); -+ AuTraceErr(err); -+ if (unlikely(err)) -+ goto out_dt; -+ } -+ -+ /* here we go */ -+ err = do_rename(a); -+ if (unlikely(err)) -+ goto out_dirren; -+ -+ if (au_ftest_ren(a->auren_flags, DIRREN)) -+ au_dr_rename_fin(a->src_dentry, a->btgt, rev); -+ -+ /* update dir attributes */ -+ au_ren_refresh_dir(a); -+ -+ /* dput/iput all lower dentries */ -+ au_ren_refresh(a); -+ -+ goto out_hdir; /* success */ -+ -+out_dirren: -+ if (au_ftest_ren(a->auren_flags, DIRREN)) -+ au_dr_rename_rev(a->src_dentry, a->btgt, rev); -+out_dt: -+ au_ren_rev_dt(err, a); -+out_hdir: -+ au_ren_unlock(a); -+out_children: -+ au_nhash_wh_free(&a->whlist); -+ if (err && a->dst_inode && a->dst_btop != a->btgt) { -+ AuDbg("btop %d, btgt %d\n", a->dst_btop, a->btgt); -+ au_set_h_dptr(a->dst_dentry, a->btgt, NULL); -+ au_set_dbtop(a->dst_dentry, a->dst_btop); -+ } -+out_parent: -+ if (!err) { -+ if (d_unhashed(a->src_dentry)) -+ au_fset_ren(a->auren_flags, DROPPED_SRC); -+ if (d_unhashed(a->dst_dentry)) -+ au_fset_ren(a->auren_flags, DROPPED_DST); -+ if (!a->exchange) -+ d_move(a->src_dentry, a->dst_dentry); -+ else { -+ d_exchange(a->src_dentry, a->dst_dentry); -+ if (au_ftest_ren(a->auren_flags, DROPPED_DST)) -+ d_drop(a->dst_dentry); -+ } -+ if (au_ftest_ren(a->auren_flags, DROPPED_SRC)) -+ d_drop(a->src_dentry); -+ } else { -+ au_update_dbtop(a->dst_dentry); -+ if (!a->dst_inode) -+ d_drop(a->dst_dentry); -+ } -+ if (au_ftest_ren(a->auren_flags, ISSAMEDIR)) -+ di_write_unlock(a->dst_parent); -+ else -+ di_write_unlock2(a->src_parent, a->dst_parent); -+out_unlock: -+ aufs_read_and_write_unlock2(a->dst_dentry, a->src_dentry); -+out_free: -+ iput(a->dst_inode); -+ if (a->thargs) -+ au_whtmp_rmdir_free(a->thargs); -+ au_kfree_rcu(a); -+out: -+ AuTraceErr(err); -+ return err; -+} -diff --git a/fs/aufs/iinfo.c b/fs/aufs/iinfo.c -new file mode 100644 -index 000000000000..098fd115052a ---- /dev/null -+++ b/fs/aufs/iinfo.c -@@ -0,0 +1,286 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * inode private data -+ */ -+ -+#include "aufs.h" -+ -+struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex) -+{ -+ struct inode *h_inode; -+ struct au_hinode *hinode; -+ -+ IiMustAnyLock(inode); -+ -+ hinode = au_hinode(au_ii(inode), bindex); -+ h_inode = hinode->hi_inode; -+ AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0); -+ return h_inode; -+} -+ -+/* todo: hard/soft set? */ -+void au_hiput(struct au_hinode *hinode) -+{ -+ au_hn_free(hinode); -+ dput(hinode->hi_whdentry); -+ iput(hinode->hi_inode); -+} -+ -+unsigned int au_hi_flags(struct inode *inode, int isdir) -+{ -+ unsigned int flags; -+ const unsigned int mnt_flags = au_mntflags(inode->i_sb); -+ -+ flags = 0; -+ if (au_opt_test(mnt_flags, XINO)) -+ au_fset_hi(flags, XINO); -+ if (isdir && au_opt_test(mnt_flags, UDBA_HNOTIFY)) -+ au_fset_hi(flags, HNOTIFY); -+ return flags; -+} -+ -+void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex, -+ struct inode *h_inode, unsigned int flags) -+{ -+ struct au_hinode *hinode; -+ struct inode *hi; -+ struct au_iinfo *iinfo = au_ii(inode); -+ -+ IiMustWriteLock(inode); -+ -+ hinode = au_hinode(iinfo, bindex); -+ hi = hinode->hi_inode; -+ AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0); -+ -+ if (hi) -+ au_hiput(hinode); -+ hinode->hi_inode = h_inode; -+ if (h_inode) { -+ int err; -+ struct super_block *sb = inode->i_sb; -+ struct au_branch *br; -+ -+ AuDebugOn(inode->i_mode -+ && (h_inode->i_mode & S_IFMT) -+ != (inode->i_mode & S_IFMT)); -+ if (bindex == iinfo->ii_btop) -+ au_cpup_igen(inode, h_inode); -+ br = au_sbr(sb, bindex); -+ hinode->hi_id = br->br_id; -+ if (au_ftest_hi(flags, XINO)) { -+ err = au_xino_write(sb, bindex, h_inode->i_ino, -+ inode->i_ino); -+ if (unlikely(err)) -+ AuIOErr1("failed au_xino_write() %d\n", err); -+ } -+ -+ if (au_ftest_hi(flags, HNOTIFY) -+ && au_br_hnotifyable(br->br_perm)) { -+ err = au_hn_alloc(hinode, inode); -+ if (unlikely(err)) -+ AuIOErr1("au_hn_alloc() %d\n", err); -+ } -+ } -+} -+ -+void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex, -+ struct dentry *h_wh) -+{ -+ struct au_hinode *hinode; -+ -+ IiMustWriteLock(inode); -+ -+ hinode = au_hinode(au_ii(inode), bindex); -+ AuDebugOn(hinode->hi_whdentry); -+ hinode->hi_whdentry = h_wh; -+} -+ -+void au_update_iigen(struct inode *inode, int half) -+{ -+ struct au_iinfo *iinfo; -+ struct au_iigen *iigen; -+ unsigned int sigen; -+ -+ sigen = au_sigen(inode->i_sb); -+ iinfo = au_ii(inode); -+ iigen = &iinfo->ii_generation; -+ spin_lock(&iigen->ig_spin); -+ iigen->ig_generation = sigen; -+ if (half) -+ au_ig_fset(iigen->ig_flags, HALF_REFRESHED); -+ else -+ au_ig_fclr(iigen->ig_flags, HALF_REFRESHED); -+ spin_unlock(&iigen->ig_spin); -+} -+ -+/* it may be called at remount time, too */ -+void au_update_ibrange(struct inode *inode, int do_put_zero) -+{ -+ struct au_iinfo *iinfo; -+ aufs_bindex_t bindex, bbot; -+ -+ AuDebugOn(au_is_bad_inode(inode)); -+ IiMustWriteLock(inode); -+ -+ iinfo = au_ii(inode); -+ if (do_put_zero && iinfo->ii_btop >= 0) { -+ for (bindex = iinfo->ii_btop; bindex <= iinfo->ii_bbot; -+ bindex++) { -+ struct inode *h_i; -+ -+ h_i = au_hinode(iinfo, bindex)->hi_inode; -+ if (h_i -+ && !h_i->i_nlink -+ && !(h_i->i_state & I_LINKABLE)) -+ au_set_h_iptr(inode, bindex, NULL, 0); -+ } -+ } -+ -+ iinfo->ii_btop = -1; -+ iinfo->ii_bbot = -1; -+ bbot = au_sbbot(inode->i_sb); -+ for (bindex = 0; bindex <= bbot; bindex++) -+ if (au_hinode(iinfo, bindex)->hi_inode) { -+ iinfo->ii_btop = bindex; -+ break; -+ } -+ if (iinfo->ii_btop >= 0) -+ for (bindex = bbot; bindex >= iinfo->ii_btop; bindex--) -+ if (au_hinode(iinfo, bindex)->hi_inode) { -+ iinfo->ii_bbot = bindex; -+ break; -+ } -+ AuDebugOn(iinfo->ii_btop > iinfo->ii_bbot); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+void au_icntnr_init_once(void *_c) -+{ -+ struct au_icntnr *c = _c; -+ struct au_iinfo *iinfo = &c->iinfo; -+ -+ spin_lock_init(&iinfo->ii_generation.ig_spin); -+ au_rw_init(&iinfo->ii_rwsem); -+ inode_init_once(&c->vfs_inode); -+} -+ -+void au_hinode_init(struct au_hinode *hinode) -+{ -+ hinode->hi_inode = NULL; -+ hinode->hi_id = -1; -+ au_hn_init(hinode); -+ hinode->hi_whdentry = NULL; -+} -+ -+int au_iinfo_init(struct inode *inode) -+{ -+ struct au_iinfo *iinfo; -+ struct super_block *sb; -+ struct au_hinode *hi; -+ int nbr, i; -+ -+ sb = inode->i_sb; -+ iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo); -+ nbr = au_sbbot(sb) + 1; -+ if (unlikely(nbr <= 0)) -+ nbr = 1; -+ hi = kmalloc_array(nbr, sizeof(*iinfo->ii_hinode), GFP_NOFS); -+ if (hi) { -+ au_lcnt_inc(&au_sbi(sb)->si_ninodes); -+ -+ iinfo->ii_hinode = hi; -+ for (i = 0; i < nbr; i++, hi++) -+ au_hinode_init(hi); -+ -+ iinfo->ii_generation.ig_generation = au_sigen(sb); -+ iinfo->ii_btop = -1; -+ iinfo->ii_bbot = -1; -+ iinfo->ii_vdir = NULL; -+ return 0; -+ } -+ return -ENOMEM; -+} -+ -+int au_hinode_realloc(struct au_iinfo *iinfo, int nbr, int may_shrink) -+{ -+ int err, i; -+ struct au_hinode *hip; -+ -+ AuRwMustWriteLock(&iinfo->ii_rwsem); -+ -+ err = -ENOMEM; -+ hip = au_krealloc(iinfo->ii_hinode, sizeof(*hip) * nbr, GFP_NOFS, -+ may_shrink); -+ if (hip) { -+ iinfo->ii_hinode = hip; -+ i = iinfo->ii_bbot + 1; -+ hip += i; -+ for (; i < nbr; i++, hip++) -+ au_hinode_init(hip); -+ err = 0; -+ } -+ -+ return err; -+} -+ -+void au_iinfo_fin(struct inode *inode) -+{ -+ struct au_iinfo *iinfo; -+ struct au_hinode *hi; -+ struct super_block *sb; -+ aufs_bindex_t bindex, bbot; -+ const unsigned char unlinked = !inode->i_nlink; -+ -+ AuDebugOn(au_is_bad_inode(inode)); -+ -+ sb = inode->i_sb; -+ au_lcnt_dec(&au_sbi(sb)->si_ninodes); -+ if (si_pid_test(sb)) -+ au_xino_delete_inode(inode, unlinked); -+ else { -+ /* -+ * it is safe to hide the dependency between sbinfo and -+ * sb->s_umount. -+ */ -+ lockdep_off(); -+ si_noflush_read_lock(sb); -+ au_xino_delete_inode(inode, unlinked); -+ si_read_unlock(sb); -+ lockdep_on(); -+ } -+ -+ iinfo = au_ii(inode); -+ if (iinfo->ii_vdir) -+ au_vdir_free(iinfo->ii_vdir); -+ -+ bindex = iinfo->ii_btop; -+ if (bindex >= 0) { -+ hi = au_hinode(iinfo, bindex); -+ bbot = iinfo->ii_bbot; -+ while (bindex++ <= bbot) { -+ if (hi->hi_inode) -+ au_hiput(hi); -+ hi++; -+ } -+ } -+ au_kfree_rcu(iinfo->ii_hinode); -+ AuRwDestroy(&iinfo->ii_rwsem); -+} -diff --git a/fs/aufs/inode.c b/fs/aufs/inode.c -new file mode 100644 -index 000000000000..985377d9bf66 ---- /dev/null -+++ b/fs/aufs/inode.c -@@ -0,0 +1,529 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * inode functions -+ */ -+ -+#include <linux/iversion.h> -+#include "aufs.h" -+ -+struct inode *au_igrab(struct inode *inode) -+{ -+ if (inode) { -+ AuDebugOn(!atomic_read(&inode->i_count)); -+ ihold(inode); -+ } -+ return inode; -+} -+ -+static void au_refresh_hinode_attr(struct inode *inode, int do_version) -+{ -+ au_cpup_attr_all(inode, /*force*/0); -+ au_update_iigen(inode, /*half*/1); -+ if (do_version) -+ inode_inc_iversion(inode); -+} -+ -+static int au_ii_refresh(struct inode *inode, int *update) -+{ -+ int err, e, nbr; -+ umode_t type; -+ aufs_bindex_t bindex, new_bindex; -+ struct super_block *sb; -+ struct au_iinfo *iinfo; -+ struct au_hinode *p, *q, tmp; -+ -+ AuDebugOn(au_is_bad_inode(inode)); -+ IiMustWriteLock(inode); -+ -+ *update = 0; -+ sb = inode->i_sb; -+ nbr = au_sbbot(sb) + 1; -+ type = inode->i_mode & S_IFMT; -+ iinfo = au_ii(inode); -+ err = au_hinode_realloc(iinfo, nbr, /*may_shrink*/0); -+ if (unlikely(err)) -+ goto out; -+ -+ AuDebugOn(iinfo->ii_btop < 0); -+ p = au_hinode(iinfo, iinfo->ii_btop); -+ for (bindex = iinfo->ii_btop; bindex <= iinfo->ii_bbot; -+ bindex++, p++) { -+ if (!p->hi_inode) -+ continue; -+ -+ AuDebugOn(type != (p->hi_inode->i_mode & S_IFMT)); -+ new_bindex = au_br_index(sb, p->hi_id); -+ if (new_bindex == bindex) -+ continue; -+ -+ if (new_bindex < 0) { -+ *update = 1; -+ au_hiput(p); -+ p->hi_inode = NULL; -+ continue; -+ } -+ -+ if (new_bindex < iinfo->ii_btop) -+ iinfo->ii_btop = new_bindex; -+ if (iinfo->ii_bbot < new_bindex) -+ iinfo->ii_bbot = new_bindex; -+ /* swap two lower inode, and loop again */ -+ q = au_hinode(iinfo, new_bindex); -+ tmp = *q; -+ *q = *p; -+ *p = tmp; -+ if (tmp.hi_inode) { -+ bindex--; -+ p--; -+ } -+ } -+ au_update_ibrange(inode, /*do_put_zero*/0); -+ au_hinode_realloc(iinfo, nbr, /*may_shrink*/1); /* harmless if err */ -+ e = au_dy_irefresh(inode); -+ if (unlikely(e && !err)) -+ err = e; -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+void au_refresh_iop(struct inode *inode, int force_getattr) -+{ -+ int type; -+ struct au_sbinfo *sbi = au_sbi(inode->i_sb); -+ const struct inode_operations *iop -+ = force_getattr ? aufs_iop : sbi->si_iop_array; -+ -+ if (inode->i_op == iop) -+ return; -+ -+ switch (inode->i_mode & S_IFMT) { -+ case S_IFDIR: -+ type = AuIop_DIR; -+ break; -+ case S_IFLNK: -+ type = AuIop_SYMLINK; -+ break; -+ default: -+ type = AuIop_OTHER; -+ break; -+ } -+ -+ inode->i_op = iop + type; -+ /* unnecessary smp_wmb() */ -+} -+ -+int au_refresh_hinode_self(struct inode *inode) -+{ -+ int err, update; -+ -+ err = au_ii_refresh(inode, &update); -+ if (!err) -+ au_refresh_hinode_attr(inode, update && S_ISDIR(inode->i_mode)); -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+int au_refresh_hinode(struct inode *inode, struct dentry *dentry) -+{ -+ int err, e, update; -+ unsigned int flags; -+ umode_t mode; -+ aufs_bindex_t bindex, bbot; -+ unsigned char isdir; -+ struct au_hinode *p; -+ struct au_iinfo *iinfo; -+ -+ err = au_ii_refresh(inode, &update); -+ if (unlikely(err)) -+ goto out; -+ -+ update = 0; -+ iinfo = au_ii(inode); -+ p = au_hinode(iinfo, iinfo->ii_btop); -+ mode = (inode->i_mode & S_IFMT); -+ isdir = S_ISDIR(mode); -+ flags = au_hi_flags(inode, isdir); -+ bbot = au_dbbot(dentry); -+ for (bindex = au_dbtop(dentry); bindex <= bbot; bindex++) { -+ struct inode *h_i, *h_inode; -+ struct dentry *h_d; -+ -+ h_d = au_h_dptr(dentry, bindex); -+ if (!h_d || d_is_negative(h_d)) -+ continue; -+ -+ h_inode = d_inode(h_d); -+ AuDebugOn(mode != (h_inode->i_mode & S_IFMT)); -+ if (iinfo->ii_btop <= bindex && bindex <= iinfo->ii_bbot) { -+ h_i = au_h_iptr(inode, bindex); -+ if (h_i) { -+ if (h_i == h_inode) -+ continue; -+ err = -EIO; -+ break; -+ } -+ } -+ if (bindex < iinfo->ii_btop) -+ iinfo->ii_btop = bindex; -+ if (iinfo->ii_bbot < bindex) -+ iinfo->ii_bbot = bindex; -+ au_set_h_iptr(inode, bindex, au_igrab(h_inode), flags); -+ update = 1; -+ } -+ au_update_ibrange(inode, /*do_put_zero*/0); -+ e = au_dy_irefresh(inode); -+ if (unlikely(e && !err)) -+ err = e; -+ if (!err) -+ au_refresh_hinode_attr(inode, update && isdir); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+static int set_inode(struct inode *inode, struct dentry *dentry) -+{ -+ int err; -+ unsigned int flags; -+ umode_t mode; -+ aufs_bindex_t bindex, btop, btail; -+ unsigned char isdir; -+ struct dentry *h_dentry; -+ struct inode *h_inode; -+ struct au_iinfo *iinfo; -+ struct inode_operations *iop; -+ -+ IiMustWriteLock(inode); -+ -+ err = 0; -+ isdir = 0; -+ iop = au_sbi(inode->i_sb)->si_iop_array; -+ btop = au_dbtop(dentry); -+ h_dentry = au_h_dptr(dentry, btop); -+ h_inode = d_inode(h_dentry); -+ mode = h_inode->i_mode; -+ switch (mode & S_IFMT) { -+ case S_IFREG: -+ btail = au_dbtail(dentry); -+ inode->i_op = iop + AuIop_OTHER; -+ inode->i_fop = &aufs_file_fop; -+ err = au_dy_iaop(inode, btop, h_inode); -+ if (unlikely(err)) -+ goto out; -+ break; -+ case S_IFDIR: -+ isdir = 1; -+ btail = au_dbtaildir(dentry); -+ inode->i_op = iop + AuIop_DIR; -+ inode->i_fop = &aufs_dir_fop; -+ break; -+ case S_IFLNK: -+ btail = au_dbtail(dentry); -+ inode->i_op = iop + AuIop_SYMLINK; -+ break; -+ case S_IFBLK: -+ case S_IFCHR: -+ case S_IFIFO: -+ case S_IFSOCK: -+ btail = au_dbtail(dentry); -+ inode->i_op = iop + AuIop_OTHER; -+ init_special_inode(inode, mode, h_inode->i_rdev); -+ break; -+ default: -+ AuIOErr("Unknown file type 0%o\n", mode); -+ err = -EIO; -+ goto out; -+ } -+ -+ /* do not set hnotify for whiteouted dirs (SHWH mode) */ -+ flags = au_hi_flags(inode, isdir); -+ if (au_opt_test(au_mntflags(dentry->d_sb), SHWH) -+ && au_ftest_hi(flags, HNOTIFY) -+ && dentry->d_name.len > AUFS_WH_PFX_LEN -+ && !memcmp(dentry->d_name.name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) -+ au_fclr_hi(flags, HNOTIFY); -+ iinfo = au_ii(inode); -+ iinfo->ii_btop = btop; -+ iinfo->ii_bbot = btail; -+ for (bindex = btop; bindex <= btail; bindex++) { -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (h_dentry) -+ au_set_h_iptr(inode, bindex, -+ au_igrab(d_inode(h_dentry)), flags); -+ } -+ au_cpup_attr_all(inode, /*force*/1); -+ /* -+ * to force calling aufs_get_acl() every time, -+ * do not call cache_no_acl() for aufs inode. -+ */ -+ -+out: -+ return err; -+} -+ -+/* -+ * successful returns with iinfo write_locked -+ * minus: errno -+ * zero: success, matched -+ * plus: no error, but unmatched -+ */ -+static int reval_inode(struct inode *inode, struct dentry *dentry) -+{ -+ int err; -+ unsigned int gen, igflags; -+ aufs_bindex_t bindex, bbot; -+ struct inode *h_inode, *h_dinode; -+ struct dentry *h_dentry; -+ -+ /* -+ * before this function, if aufs got any iinfo lock, it must be only -+ * one, the parent dir. -+ * it can happen by UDBA and the obsoleted inode number. -+ */ -+ err = -EIO; -+ if (unlikely(inode->i_ino == parent_ino(dentry))) -+ goto out; -+ -+ err = 1; -+ ii_write_lock_new_child(inode); -+ h_dentry = au_h_dptr(dentry, au_dbtop(dentry)); -+ h_dinode = d_inode(h_dentry); -+ bbot = au_ibbot(inode); -+ for (bindex = au_ibtop(inode); bindex <= bbot; bindex++) { -+ h_inode = au_h_iptr(inode, bindex); -+ if (!h_inode || h_inode != h_dinode) -+ continue; -+ -+ err = 0; -+ gen = au_iigen(inode, &igflags); -+ if (gen == au_digen(dentry) -+ && !au_ig_ftest(igflags, HALF_REFRESHED)) -+ break; -+ -+ /* fully refresh inode using dentry */ -+ err = au_refresh_hinode(inode, dentry); -+ if (!err) -+ au_update_iigen(inode, /*half*/0); -+ break; -+ } -+ -+ if (unlikely(err)) -+ ii_write_unlock(inode); -+out: -+ return err; -+} -+ -+int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, -+ unsigned int d_type, ino_t *ino) -+{ -+ int err, idx; -+ const int isnondir = d_type != DT_DIR; -+ -+ /* prevent hardlinked inode number from race condition */ -+ if (isnondir) { -+ err = au_xinondir_enter(sb, bindex, h_ino, &idx); -+ if (unlikely(err)) -+ goto out; -+ } -+ -+ err = au_xino_read(sb, bindex, h_ino, ino); -+ if (unlikely(err)) -+ goto out_xinondir; -+ -+ if (!*ino) { -+ err = -EIO; -+ *ino = au_xino_new_ino(sb); -+ if (unlikely(!*ino)) -+ goto out_xinondir; -+ err = au_xino_write(sb, bindex, h_ino, *ino); -+ if (unlikely(err)) -+ goto out_xinondir; -+ } -+ -+out_xinondir: -+ if (isnondir && idx >= 0) -+ au_xinondir_leave(sb, bindex, h_ino, idx); -+out: -+ return err; -+} -+ -+/* successful returns with iinfo write_locked */ -+/* todo: return with unlocked? */ -+struct inode *au_new_inode(struct dentry *dentry, int must_new) -+{ -+ struct inode *inode, *h_inode; -+ struct dentry *h_dentry; -+ struct super_block *sb; -+ ino_t h_ino, ino; -+ int err, idx, hlinked; -+ aufs_bindex_t btop; -+ -+ sb = dentry->d_sb; -+ btop = au_dbtop(dentry); -+ h_dentry = au_h_dptr(dentry, btop); -+ h_inode = d_inode(h_dentry); -+ h_ino = h_inode->i_ino; -+ hlinked = !d_is_dir(h_dentry) && h_inode->i_nlink > 1; -+ -+new_ino: -+ /* -+ * stop 'race'-ing between hardlinks under different -+ * parents. -+ */ -+ if (hlinked) { -+ err = au_xinondir_enter(sb, btop, h_ino, &idx); -+ inode = ERR_PTR(err); -+ if (unlikely(err)) -+ goto out; -+ } -+ -+ err = au_xino_read(sb, btop, h_ino, &ino); -+ inode = ERR_PTR(err); -+ if (unlikely(err)) -+ goto out_xinondir; -+ -+ if (!ino) { -+ ino = au_xino_new_ino(sb); -+ if (unlikely(!ino)) { -+ inode = ERR_PTR(-EIO); -+ goto out_xinondir; -+ } -+ } -+ -+ AuDbg("i%lu\n", (unsigned long)ino); -+ inode = au_iget_locked(sb, ino); -+ err = PTR_ERR(inode); -+ if (IS_ERR(inode)) -+ goto out_xinondir; -+ -+ AuDbg("%lx, new %d\n", inode->i_state, !!(inode->i_state & I_NEW)); -+ if (inode->i_state & I_NEW) { -+ ii_write_lock_new_child(inode); -+ err = set_inode(inode, dentry); -+ if (!err) { -+ unlock_new_inode(inode); -+ goto out_xinondir; /* success */ -+ } -+ -+ /* -+ * iget_failed() calls iput(), but we need to call -+ * ii_write_unlock() after iget_failed(). so dirty hack for -+ * i_count. -+ */ -+ atomic_inc(&inode->i_count); -+ iget_failed(inode); -+ ii_write_unlock(inode); -+ au_xino_write(sb, btop, h_ino, /*ino*/0); -+ /* ignore this error */ -+ goto out_iput; -+ } else if (!must_new && !IS_DEADDIR(inode) && inode->i_nlink) { -+ /* -+ * horrible race condition between lookup, readdir and copyup -+ * (or something). -+ */ -+ if (hlinked && idx >= 0) -+ au_xinondir_leave(sb, btop, h_ino, idx); -+ err = reval_inode(inode, dentry); -+ if (unlikely(err < 0)) { -+ hlinked = 0; -+ goto out_iput; -+ } -+ if (!err) -+ goto out; /* success */ -+ else if (hlinked && idx >= 0) { -+ err = au_xinondir_enter(sb, btop, h_ino, &idx); -+ if (unlikely(err)) { -+ iput(inode); -+ inode = ERR_PTR(err); -+ goto out; -+ } -+ } -+ } -+ -+ if (unlikely(au_test_fs_unique_ino(h_inode))) -+ AuWarn1("Warning: Un-notified UDBA or repeatedly renamed dir," -+ " b%d, %s, %pd, hi%lu, i%lu.\n", -+ btop, au_sbtype(h_dentry->d_sb), dentry, -+ (unsigned long)h_ino, (unsigned long)ino); -+ ino = 0; -+ err = au_xino_write(sb, btop, h_ino, /*ino*/0); -+ if (!err) { -+ iput(inode); -+ if (hlinked && idx >= 0) -+ au_xinondir_leave(sb, btop, h_ino, idx); -+ goto new_ino; -+ } -+ -+out_iput: -+ iput(inode); -+ inode = ERR_PTR(err); -+out_xinondir: -+ if (hlinked && idx >= 0) -+ au_xinondir_leave(sb, btop, h_ino, idx); -+out: -+ return inode; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int au_test_ro(struct super_block *sb, aufs_bindex_t bindex, -+ struct inode *inode) -+{ -+ int err; -+ struct inode *hi; -+ -+ err = au_br_rdonly(au_sbr(sb, bindex)); -+ -+ /* pseudo-link after flushed may happen out of bounds */ -+ if (!err -+ && inode -+ && au_ibtop(inode) <= bindex -+ && bindex <= au_ibbot(inode)) { -+ /* -+ * permission check is unnecessary since vfsub routine -+ * will be called later -+ */ -+ hi = au_h_iptr(inode, bindex); -+ if (hi) -+ err = IS_IMMUTABLE(hi) ? -EROFS : 0; -+ } -+ -+ return err; -+} -+ -+int au_test_h_perm(struct inode *h_inode, int mask) -+{ -+ if (uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) -+ return 0; -+ return inode_permission(h_inode, mask); -+} -+ -+int au_test_h_perm_sio(struct inode *h_inode, int mask) -+{ -+ if (au_test_nfs(h_inode->i_sb) -+ && (mask & MAY_WRITE) -+ && S_ISDIR(h_inode->i_mode)) -+ mask |= MAY_READ; /* force permission check */ -+ return au_test_h_perm(h_inode, mask); -+} -diff --git a/fs/aufs/inode.h b/fs/aufs/inode.h -new file mode 100644 -index 000000000000..e387ef16e999 ---- /dev/null -+++ b/fs/aufs/inode.h -@@ -0,0 +1,698 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * inode operations -+ */ -+ -+#ifndef __AUFS_INODE_H__ -+#define __AUFS_INODE_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/fsnotify.h> -+#include "rwsem.h" -+ -+struct vfsmount; -+ -+struct au_hnotify { -+#ifdef CONFIG_AUFS_HNOTIFY -+#ifdef CONFIG_AUFS_HFSNOTIFY -+ /* never use fsnotify_add_vfsmount_mark() */ -+ struct fsnotify_mark hn_mark; -+#endif -+ struct inode *hn_aufs_inode; /* no get/put */ -+ struct rcu_head rcu; -+#endif -+} ____cacheline_aligned_in_smp; -+ -+struct au_hinode { -+ struct inode *hi_inode; -+ aufs_bindex_t hi_id; -+#ifdef CONFIG_AUFS_HNOTIFY -+ struct au_hnotify *hi_notify; -+#endif -+ -+ /* reference to the copied-up whiteout with get/put */ -+ struct dentry *hi_whdentry; -+}; -+ -+/* ig_flags */ -+#define AuIG_HALF_REFRESHED 1 -+#define au_ig_ftest(flags, name) ((flags) & AuIG_##name) -+#define au_ig_fset(flags, name) \ -+ do { (flags) |= AuIG_##name; } while (0) -+#define au_ig_fclr(flags, name) \ -+ do { (flags) &= ~AuIG_##name; } while (0) -+ -+struct au_iigen { -+ spinlock_t ig_spin; -+ __u32 ig_generation, ig_flags; -+}; -+ -+struct au_vdir; -+struct au_iinfo { -+ struct au_iigen ii_generation; -+ struct super_block *ii_hsb1; /* no get/put */ -+ -+ struct au_rwsem ii_rwsem; -+ aufs_bindex_t ii_btop, ii_bbot; -+ __u32 ii_higen; -+ struct au_hinode *ii_hinode; -+ struct au_vdir *ii_vdir; -+}; -+ -+struct au_icntnr { -+ struct au_iinfo iinfo; -+ struct inode vfs_inode; -+ struct hlist_bl_node plink; -+ struct rcu_head rcu; -+} ____cacheline_aligned_in_smp; -+ -+/* au_pin flags */ -+#define AuPin_DI_LOCKED 1 -+#define AuPin_MNT_WRITE (1 << 1) -+#define au_ftest_pin(flags, name) ((flags) & AuPin_##name) -+#define au_fset_pin(flags, name) \ -+ do { (flags) |= AuPin_##name; } while (0) -+#define au_fclr_pin(flags, name) \ -+ do { (flags) &= ~AuPin_##name; } while (0) -+ -+struct au_pin { -+ /* input */ -+ struct dentry *dentry; -+ unsigned int udba; -+ unsigned char lsc_di, lsc_hi, flags; -+ aufs_bindex_t bindex; -+ -+ /* output */ -+ struct dentry *parent; -+ struct au_hinode *hdir; -+ struct vfsmount *h_mnt; -+ -+ /* temporary unlock/relock for copyup */ -+ struct dentry *h_dentry, *h_parent; -+ struct au_branch *br; -+ struct task_struct *task; -+}; -+ -+void au_pin_hdir_unlock(struct au_pin *p); -+int au_pin_hdir_lock(struct au_pin *p); -+int au_pin_hdir_relock(struct au_pin *p); -+void au_pin_hdir_acquire_nest(struct au_pin *p); -+void au_pin_hdir_release(struct au_pin *p); -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline struct au_iinfo *au_ii(struct inode *inode) -+{ -+ BUG_ON(is_bad_inode(inode)); -+ return &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* inode.c */ -+struct inode *au_igrab(struct inode *inode); -+void au_refresh_iop(struct inode *inode, int force_getattr); -+int au_refresh_hinode_self(struct inode *inode); -+int au_refresh_hinode(struct inode *inode, struct dentry *dentry); -+int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, -+ unsigned int d_type, ino_t *ino); -+struct inode *au_new_inode(struct dentry *dentry, int must_new); -+int au_test_ro(struct super_block *sb, aufs_bindex_t bindex, -+ struct inode *inode); -+int au_test_h_perm(struct inode *h_inode, int mask); -+int au_test_h_perm_sio(struct inode *h_inode, int mask); -+ -+static inline int au_wh_ino(struct super_block *sb, aufs_bindex_t bindex, -+ ino_t h_ino, unsigned int d_type, ino_t *ino) -+{ -+#ifdef CONFIG_AUFS_SHWH -+ return au_ino(sb, bindex, h_ino, d_type, ino); -+#else -+ return 0; -+#endif -+} -+ -+/* i_op.c */ -+enum { -+ AuIop_SYMLINK, -+ AuIop_DIR, -+ AuIop_OTHER, -+ AuIop_Last -+}; -+extern struct inode_operations aufs_iop[AuIop_Last], -+ aufs_iop_nogetattr[AuIop_Last]; -+ -+/* au_wr_dir flags */ -+#define AuWrDir_ADD_ENTRY 1 -+#define AuWrDir_ISDIR (1 << 1) -+#define AuWrDir_TMPFILE (1 << 2) -+#define au_ftest_wrdir(flags, name) ((flags) & AuWrDir_##name) -+#define au_fset_wrdir(flags, name) \ -+ do { (flags) |= AuWrDir_##name; } while (0) -+#define au_fclr_wrdir(flags, name) \ -+ do { (flags) &= ~AuWrDir_##name; } while (0) -+ -+struct au_wr_dir_args { -+ aufs_bindex_t force_btgt; -+ unsigned char flags; -+}; -+int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry, -+ struct au_wr_dir_args *args); -+ -+struct dentry *au_pinned_h_parent(struct au_pin *pin); -+void au_pin_init(struct au_pin *pin, struct dentry *dentry, -+ aufs_bindex_t bindex, int lsc_di, int lsc_hi, -+ unsigned int udba, unsigned char flags); -+int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex, -+ unsigned int udba, unsigned char flags) __must_check; -+int au_do_pin(struct au_pin *pin) __must_check; -+void au_unpin(struct au_pin *pin); -+int au_reval_for_attr(struct dentry *dentry, unsigned int sigen); -+ -+#define AuIcpup_DID_CPUP 1 -+#define au_ftest_icpup(flags, name) ((flags) & AuIcpup_##name) -+#define au_fset_icpup(flags, name) \ -+ do { (flags) |= AuIcpup_##name; } while (0) -+#define au_fclr_icpup(flags, name) \ -+ do { (flags) &= ~AuIcpup_##name; } while (0) -+ -+struct au_icpup_args { -+ unsigned char flags; -+ unsigned char pin_flags; -+ aufs_bindex_t btgt; -+ unsigned int udba; -+ struct au_pin pin; -+ struct path h_path; -+ struct inode *h_inode; -+}; -+ -+int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia, -+ struct au_icpup_args *a); -+ -+int au_h_path_getattr(struct dentry *dentry, int force, struct path *h_path, -+ int locked); -+ -+/* i_op_add.c */ -+int au_may_add(struct dentry *dentry, aufs_bindex_t bindex, -+ struct dentry *h_parent, int isdir); -+int aufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, -+ dev_t dev); -+int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname); -+int aufs_create(struct inode *dir, struct dentry *dentry, umode_t mode, -+ bool want_excl); -+struct vfsub_aopen_args; -+int au_aopen_or_create(struct inode *dir, struct dentry *dentry, -+ struct vfsub_aopen_args *args); -+int aufs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode); -+int aufs_link(struct dentry *src_dentry, struct inode *dir, -+ struct dentry *dentry); -+int aufs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); -+ -+/* i_op_del.c */ -+int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup); -+int au_may_del(struct dentry *dentry, aufs_bindex_t bindex, -+ struct dentry *h_parent, int isdir); -+int aufs_unlink(struct inode *dir, struct dentry *dentry); -+int aufs_rmdir(struct inode *dir, struct dentry *dentry); -+ -+/* i_op_ren.c */ -+int au_wbr(struct dentry *dentry, aufs_bindex_t btgt); -+int aufs_rename(struct inode *src_dir, struct dentry *src_dentry, -+ struct inode *dir, struct dentry *dentry, -+ unsigned int flags); -+ -+/* iinfo.c */ -+struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex); -+void au_hiput(struct au_hinode *hinode); -+void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex, -+ struct dentry *h_wh); -+unsigned int au_hi_flags(struct inode *inode, int isdir); -+ -+/* hinode flags */ -+#define AuHi_XINO 1 -+#define AuHi_HNOTIFY (1 << 1) -+#define au_ftest_hi(flags, name) ((flags) & AuHi_##name) -+#define au_fset_hi(flags, name) \ -+ do { (flags) |= AuHi_##name; } while (0) -+#define au_fclr_hi(flags, name) \ -+ do { (flags) &= ~AuHi_##name; } while (0) -+ -+#ifndef CONFIG_AUFS_HNOTIFY -+#undef AuHi_HNOTIFY -+#define AuHi_HNOTIFY 0 -+#endif -+ -+void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex, -+ struct inode *h_inode, unsigned int flags); -+ -+void au_update_iigen(struct inode *inode, int half); -+void au_update_ibrange(struct inode *inode, int do_put_zero); -+ -+void au_icntnr_init_once(void *_c); -+void au_hinode_init(struct au_hinode *hinode); -+int au_iinfo_init(struct inode *inode); -+void au_iinfo_fin(struct inode *inode); -+int au_hinode_realloc(struct au_iinfo *iinfo, int nbr, int may_shrink); -+ -+#ifdef CONFIG_PROC_FS -+/* plink.c */ -+int au_plink_maint(struct super_block *sb, int flags); -+struct au_sbinfo; -+void au_plink_maint_leave(struct au_sbinfo *sbinfo); -+int au_plink_maint_enter(struct super_block *sb); -+#ifdef CONFIG_AUFS_DEBUG -+void au_plink_list(struct super_block *sb); -+#else -+AuStubVoid(au_plink_list, struct super_block *sb) -+#endif -+int au_plink_test(struct inode *inode); -+struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex); -+void au_plink_append(struct inode *inode, aufs_bindex_t bindex, -+ struct dentry *h_dentry); -+void au_plink_put(struct super_block *sb, int verbose); -+void au_plink_clean(struct super_block *sb, int verbose); -+void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id); -+#else -+AuStubInt0(au_plink_maint, struct super_block *sb, int flags); -+AuStubVoid(au_plink_maint_leave, struct au_sbinfo *sbinfo); -+AuStubInt0(au_plink_maint_enter, struct super_block *sb); -+AuStubVoid(au_plink_list, struct super_block *sb); -+AuStubInt0(au_plink_test, struct inode *inode); -+AuStub(struct dentry *, au_plink_lkup, return NULL, -+ struct inode *inode, aufs_bindex_t bindex); -+AuStubVoid(au_plink_append, struct inode *inode, aufs_bindex_t bindex, -+ struct dentry *h_dentry); -+AuStubVoid(au_plink_put, struct super_block *sb, int verbose); -+AuStubVoid(au_plink_clean, struct super_block *sb, int verbose); -+AuStubVoid(au_plink_half_refresh, struct super_block *sb, aufs_bindex_t br_id); -+#endif /* CONFIG_PROC_FS */ -+ -+#ifdef CONFIG_AUFS_XATTR -+/* xattr.c */ -+int au_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, int ignore_flags, -+ unsigned int verbose); -+ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t size); -+void au_xattr_init(struct super_block *sb); -+#else -+AuStubInt0(au_cpup_xattr, struct dentry *h_dst, struct dentry *h_src, -+ int ignore_flags, unsigned int verbose); -+AuStubVoid(au_xattr_init, struct super_block *sb); -+#endif -+ -+#ifdef CONFIG_FS_POSIX_ACL -+struct posix_acl *aufs_get_acl(struct inode *inode, int type); -+int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type); -+#endif -+ -+#if IS_ENABLED(CONFIG_AUFS_XATTR) || IS_ENABLED(CONFIG_FS_POSIX_ACL) -+enum { -+ AU_XATTR_SET, -+ AU_ACL_SET -+}; -+ -+struct au_sxattr { -+ int type; -+ union { -+ struct { -+ const char *name; -+ const void *value; -+ size_t size; -+ int flags; -+ } set; -+ struct { -+ struct posix_acl *acl; -+ int type; -+ } acl_set; -+ } u; -+}; -+ssize_t au_sxattr(struct dentry *dentry, struct inode *inode, -+ struct au_sxattr *arg); -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* lock subclass for iinfo */ -+enum { -+ AuLsc_II_CHILD, /* child first */ -+ AuLsc_II_CHILD2, /* rename(2), link(2), and cpup at hnotify */ -+ AuLsc_II_CHILD3, /* copyup dirs */ -+ AuLsc_II_PARENT, /* see AuLsc_I_PARENT in vfsub.h */ -+ AuLsc_II_PARENT2, -+ AuLsc_II_PARENT3, /* copyup dirs */ -+ AuLsc_II_NEW_CHILD -+}; -+ -+/* -+ * ii_read_lock_child, ii_write_lock_child, -+ * ii_read_lock_child2, ii_write_lock_child2, -+ * ii_read_lock_child3, ii_write_lock_child3, -+ * ii_read_lock_parent, ii_write_lock_parent, -+ * ii_read_lock_parent2, ii_write_lock_parent2, -+ * ii_read_lock_parent3, ii_write_lock_parent3, -+ * ii_read_lock_new_child, ii_write_lock_new_child, -+ */ -+#define AuReadLockFunc(name, lsc) \ -+static inline void ii_read_lock_##name(struct inode *i) \ -+{ \ -+ au_rw_read_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \ -+} -+ -+#define AuWriteLockFunc(name, lsc) \ -+static inline void ii_write_lock_##name(struct inode *i) \ -+{ \ -+ au_rw_write_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \ -+} -+ -+#define AuRWLockFuncs(name, lsc) \ -+ AuReadLockFunc(name, lsc) \ -+ AuWriteLockFunc(name, lsc) -+ -+AuRWLockFuncs(child, CHILD); -+AuRWLockFuncs(child2, CHILD2); -+AuRWLockFuncs(child3, CHILD3); -+AuRWLockFuncs(parent, PARENT); -+AuRWLockFuncs(parent2, PARENT2); -+AuRWLockFuncs(parent3, PARENT3); -+AuRWLockFuncs(new_child, NEW_CHILD); -+ -+#undef AuReadLockFunc -+#undef AuWriteLockFunc -+#undef AuRWLockFuncs -+ -+#define ii_read_unlock(i) au_rw_read_unlock(&au_ii(i)->ii_rwsem) -+#define ii_write_unlock(i) au_rw_write_unlock(&au_ii(i)->ii_rwsem) -+#define ii_downgrade_lock(i) au_rw_dgrade_lock(&au_ii(i)->ii_rwsem) -+ -+#define IiMustNoWaiters(i) AuRwMustNoWaiters(&au_ii(i)->ii_rwsem) -+#define IiMustAnyLock(i) AuRwMustAnyLock(&au_ii(i)->ii_rwsem) -+#define IiMustWriteLock(i) AuRwMustWriteLock(&au_ii(i)->ii_rwsem) -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline void au_icntnr_init(struct au_icntnr *c) -+{ -+#ifdef CONFIG_AUFS_DEBUG -+ c->vfs_inode.i_mode = 0; -+#endif -+} -+ -+static inline unsigned int au_iigen(struct inode *inode, unsigned int *igflags) -+{ -+ unsigned int gen; -+ struct au_iinfo *iinfo; -+ struct au_iigen *iigen; -+ -+ iinfo = au_ii(inode); -+ iigen = &iinfo->ii_generation; -+ spin_lock(&iigen->ig_spin); -+ if (igflags) -+ *igflags = iigen->ig_flags; -+ gen = iigen->ig_generation; -+ spin_unlock(&iigen->ig_spin); -+ -+ return gen; -+} -+ -+/* tiny test for inode number */ -+/* tmpfs generation is too rough */ -+static inline int au_test_higen(struct inode *inode, struct inode *h_inode) -+{ -+ struct au_iinfo *iinfo; -+ -+ iinfo = au_ii(inode); -+ AuRwMustAnyLock(&iinfo->ii_rwsem); -+ return !(iinfo->ii_hsb1 == h_inode->i_sb -+ && iinfo->ii_higen == h_inode->i_generation); -+} -+ -+static inline void au_iigen_dec(struct inode *inode) -+{ -+ struct au_iinfo *iinfo; -+ struct au_iigen *iigen; -+ -+ iinfo = au_ii(inode); -+ iigen = &iinfo->ii_generation; -+ spin_lock(&iigen->ig_spin); -+ iigen->ig_generation--; -+ spin_unlock(&iigen->ig_spin); -+} -+ -+static inline int au_iigen_test(struct inode *inode, unsigned int sigen) -+{ -+ int err; -+ -+ err = 0; -+ if (unlikely(inode && au_iigen(inode, NULL) != sigen)) -+ err = -EIO; -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline struct au_hinode *au_hinode(struct au_iinfo *iinfo, -+ aufs_bindex_t bindex) -+{ -+ return iinfo->ii_hinode + bindex; -+} -+ -+static inline int au_is_bad_inode(struct inode *inode) -+{ -+ return !!(is_bad_inode(inode) || !au_hinode(au_ii(inode), 0)); -+} -+ -+static inline aufs_bindex_t au_ii_br_id(struct inode *inode, -+ aufs_bindex_t bindex) -+{ -+ IiMustAnyLock(inode); -+ return au_hinode(au_ii(inode), bindex)->hi_id; -+} -+ -+static inline aufs_bindex_t au_ibtop(struct inode *inode) -+{ -+ IiMustAnyLock(inode); -+ return au_ii(inode)->ii_btop; -+} -+ -+static inline aufs_bindex_t au_ibbot(struct inode *inode) -+{ -+ IiMustAnyLock(inode); -+ return au_ii(inode)->ii_bbot; -+} -+ -+static inline struct au_vdir *au_ivdir(struct inode *inode) -+{ -+ IiMustAnyLock(inode); -+ return au_ii(inode)->ii_vdir; -+} -+ -+static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex) -+{ -+ IiMustAnyLock(inode); -+ return au_hinode(au_ii(inode), bindex)->hi_whdentry; -+} -+ -+static inline void au_set_ibtop(struct inode *inode, aufs_bindex_t bindex) -+{ -+ IiMustWriteLock(inode); -+ au_ii(inode)->ii_btop = bindex; -+} -+ -+static inline void au_set_ibbot(struct inode *inode, aufs_bindex_t bindex) -+{ -+ IiMustWriteLock(inode); -+ au_ii(inode)->ii_bbot = bindex; -+} -+ -+static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir) -+{ -+ IiMustWriteLock(inode); -+ au_ii(inode)->ii_vdir = vdir; -+} -+ -+static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex) -+{ -+ IiMustAnyLock(inode); -+ return au_hinode(au_ii(inode), bindex); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline struct dentry *au_pinned_parent(struct au_pin *pin) -+{ -+ if (pin) -+ return pin->parent; -+ return NULL; -+} -+ -+static inline struct inode *au_pinned_h_dir(struct au_pin *pin) -+{ -+ if (pin && pin->hdir) -+ return pin->hdir->hi_inode; -+ return NULL; -+} -+ -+static inline struct au_hinode *au_pinned_hdir(struct au_pin *pin) -+{ -+ if (pin) -+ return pin->hdir; -+ return NULL; -+} -+ -+static inline void au_pin_set_dentry(struct au_pin *pin, struct dentry *dentry) -+{ -+ if (pin) -+ pin->dentry = dentry; -+} -+ -+static inline void au_pin_set_parent_lflag(struct au_pin *pin, -+ unsigned char lflag) -+{ -+ if (pin) { -+ if (lflag) -+ au_fset_pin(pin->flags, DI_LOCKED); -+ else -+ au_fclr_pin(pin->flags, DI_LOCKED); -+ } -+} -+ -+#if 0 /* reserved */ -+static inline void au_pin_set_parent(struct au_pin *pin, struct dentry *parent) -+{ -+ if (pin) { -+ dput(pin->parent); -+ pin->parent = dget(parent); -+ } -+} -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct au_branch; -+#ifdef CONFIG_AUFS_HNOTIFY -+struct au_hnotify_op { -+ void (*ctl)(struct au_hinode *hinode, int do_set); -+ int (*alloc)(struct au_hinode *hinode); -+ -+ /* -+ * if it returns true, the the caller should free hinode->hi_notify, -+ * otherwise ->free() frees it. -+ */ -+ int (*free)(struct au_hinode *hinode, -+ struct au_hnotify *hn) __must_check; -+ -+ void (*fin)(void); -+ int (*init)(void); -+ -+ int (*reset_br)(unsigned int udba, struct au_branch *br, int perm); -+ void (*fin_br)(struct au_branch *br); -+ int (*init_br)(struct au_branch *br, int perm); -+}; -+ -+/* hnotify.c */ -+int au_hn_alloc(struct au_hinode *hinode, struct inode *inode); -+void au_hn_free(struct au_hinode *hinode); -+void au_hn_ctl(struct au_hinode *hinode, int do_set); -+void au_hn_reset(struct inode *inode, unsigned int flags); -+int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask, -+ const struct qstr *h_child_qstr, struct inode *h_child_inode); -+int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm); -+int au_hnotify_init_br(struct au_branch *br, int perm); -+void au_hnotify_fin_br(struct au_branch *br); -+int __init au_hnotify_init(void); -+void au_hnotify_fin(void); -+ -+/* hfsnotify.c */ -+extern const struct au_hnotify_op au_hnotify_op; -+ -+static inline -+void au_hn_init(struct au_hinode *hinode) -+{ -+ hinode->hi_notify = NULL; -+} -+ -+static inline struct au_hnotify *au_hn(struct au_hinode *hinode) -+{ -+ return hinode->hi_notify; -+} -+ -+#else -+AuStub(int, au_hn_alloc, return -EOPNOTSUPP, -+ struct au_hinode *hinode __maybe_unused, -+ struct inode *inode __maybe_unused) -+AuStub(struct au_hnotify *, au_hn, return NULL, struct au_hinode *hinode) -+AuStubVoid(au_hn_free, struct au_hinode *hinode __maybe_unused) -+AuStubVoid(au_hn_ctl, struct au_hinode *hinode __maybe_unused, -+ int do_set __maybe_unused) -+AuStubVoid(au_hn_reset, struct inode *inode __maybe_unused, -+ unsigned int flags __maybe_unused) -+AuStubInt0(au_hnotify_reset_br, unsigned int udba __maybe_unused, -+ struct au_branch *br __maybe_unused, -+ int perm __maybe_unused) -+AuStubInt0(au_hnotify_init_br, struct au_branch *br __maybe_unused, -+ int perm __maybe_unused) -+AuStubVoid(au_hnotify_fin_br, struct au_branch *br __maybe_unused) -+AuStubInt0(__init au_hnotify_init, void) -+AuStubVoid(au_hnotify_fin, void) -+AuStubVoid(au_hn_init, struct au_hinode *hinode __maybe_unused) -+#endif /* CONFIG_AUFS_HNOTIFY */ -+ -+static inline void au_hn_suspend(struct au_hinode *hdir) -+{ -+ au_hn_ctl(hdir, /*do_set*/0); -+} -+ -+static inline void au_hn_resume(struct au_hinode *hdir) -+{ -+ au_hn_ctl(hdir, /*do_set*/1); -+} -+ -+static inline void au_hn_inode_lock(struct au_hinode *hdir) -+{ -+ inode_lock(hdir->hi_inode); -+ au_hn_suspend(hdir); -+} -+ -+static inline void au_hn_inode_lock_nested(struct au_hinode *hdir, -+ unsigned int sc __maybe_unused) -+{ -+ inode_lock_nested(hdir->hi_inode, sc); -+ au_hn_suspend(hdir); -+} -+ -+#if 0 /* unused */ -+#include "vfsub.h" -+static inline void au_hn_inode_lock_shared_nested(struct au_hinode *hdir, -+ unsigned int sc) -+{ -+ inode_lock_shared_nested(hdir->hi_inode, sc); -+ au_hn_suspend(hdir); -+} -+#endif -+ -+static inline void au_hn_inode_unlock(struct au_hinode *hdir) -+{ -+ au_hn_resume(hdir); -+ inode_unlock(hdir->hi_inode); -+} -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_INODE_H__ */ -diff --git a/fs/aufs/ioctl.c b/fs/aufs/ioctl.c -new file mode 100644 -index 000000000000..fb2fb758283e ---- /dev/null -+++ b/fs/aufs/ioctl.c -@@ -0,0 +1,220 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * ioctl -+ * plink-management and readdir in userspace. -+ * assist the pathconf(3) wrapper library. -+ * move-down -+ * File-based Hierarchical Storage Management. -+ */ -+ -+#include <linux/compat.h> -+#include <linux/file.h> -+#include "aufs.h" -+ -+static int au_wbr_fd(struct path *path, struct aufs_wbr_fd __user *arg) -+{ -+ int err, fd; -+ aufs_bindex_t wbi, bindex, bbot; -+ struct file *h_file; -+ struct super_block *sb; -+ struct dentry *root; -+ struct au_branch *br; -+ struct aufs_wbr_fd wbrfd = { -+ .oflags = au_dir_roflags, -+ .brid = -1 -+ }; -+ const int valid = O_RDONLY | O_NONBLOCK | O_LARGEFILE | O_DIRECTORY -+ | O_NOATIME | O_CLOEXEC; -+ -+ AuDebugOn(wbrfd.oflags & ~valid); -+ -+ if (arg) { -+ err = copy_from_user(&wbrfd, arg, sizeof(wbrfd)); -+ if (unlikely(err)) { -+ err = -EFAULT; -+ goto out; -+ } -+ -+ err = -EINVAL; -+ AuDbg("wbrfd{0%o, %d}\n", wbrfd.oflags, wbrfd.brid); -+ wbrfd.oflags |= au_dir_roflags; -+ AuDbg("0%o\n", wbrfd.oflags); -+ if (unlikely(wbrfd.oflags & ~valid)) -+ goto out; -+ } -+ -+ fd = get_unused_fd_flags(0); -+ err = fd; -+ if (unlikely(fd < 0)) -+ goto out; -+ -+ h_file = ERR_PTR(-EINVAL); -+ wbi = 0; -+ br = NULL; -+ sb = path->dentry->d_sb; -+ root = sb->s_root; -+ aufs_read_lock(root, AuLock_IR); -+ bbot = au_sbbot(sb); -+ if (wbrfd.brid >= 0) { -+ wbi = au_br_index(sb, wbrfd.brid); -+ if (unlikely(wbi < 0 || wbi > bbot)) -+ goto out_unlock; -+ } -+ -+ h_file = ERR_PTR(-ENOENT); -+ br = au_sbr(sb, wbi); -+ if (!au_br_writable(br->br_perm)) { -+ if (arg) -+ goto out_unlock; -+ -+ bindex = wbi + 1; -+ wbi = -1; -+ for (; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ if (au_br_writable(br->br_perm)) { -+ wbi = bindex; -+ br = au_sbr(sb, wbi); -+ break; -+ } -+ } -+ } -+ AuDbg("wbi %d\n", wbi); -+ if (wbi >= 0) -+ h_file = au_h_open(root, wbi, wbrfd.oflags, NULL, -+ /*force_wr*/0); -+ -+out_unlock: -+ aufs_read_unlock(root, AuLock_IR); -+ err = PTR_ERR(h_file); -+ if (IS_ERR(h_file)) -+ goto out_fd; -+ -+ au_lcnt_dec(&br->br_nfiles); /* cf. au_h_open() */ -+ fd_install(fd, h_file); -+ err = fd; -+ goto out; /* success */ -+ -+out_fd: -+ put_unused_fd(fd); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg) -+{ -+ long err; -+ struct dentry *dentry; -+ -+ switch (cmd) { -+ case AUFS_CTL_RDU: -+ case AUFS_CTL_RDU_INO: -+ err = au_rdu_ioctl(file, cmd, arg); -+ break; -+ -+ case AUFS_CTL_WBR_FD: -+ err = au_wbr_fd(&file->f_path, (void __user *)arg); -+ break; -+ -+ case AUFS_CTL_IBUSY: -+ err = au_ibusy_ioctl(file, arg); -+ break; -+ -+ case AUFS_CTL_BRINFO: -+ err = au_brinfo_ioctl(file, arg); -+ break; -+ -+ case AUFS_CTL_FHSM_FD: -+ dentry = file->f_path.dentry; -+ if (IS_ROOT(dentry)) -+ err = au_fhsm_fd(dentry->d_sb, arg); -+ else -+ err = -ENOTTY; -+ break; -+ -+ default: -+ /* do not call the lower */ -+ AuDbg("0x%x\n", cmd); -+ err = -ENOTTY; -+ } -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg) -+{ -+ long err; -+ -+ switch (cmd) { -+ case AUFS_CTL_MVDOWN: -+ err = au_mvdown(file->f_path.dentry, (void __user *)arg); -+ break; -+ -+ case AUFS_CTL_WBR_FD: -+ err = au_wbr_fd(&file->f_path, (void __user *)arg); -+ break; -+ -+ default: -+ /* do not call the lower */ -+ AuDbg("0x%x\n", cmd); -+ err = -ENOTTY; -+ } -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+#ifdef CONFIG_COMPAT -+long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd, -+ unsigned long arg) -+{ -+ long err; -+ -+ switch (cmd) { -+ case AUFS_CTL_RDU: -+ case AUFS_CTL_RDU_INO: -+ err = au_rdu_compat_ioctl(file, cmd, arg); -+ break; -+ -+ case AUFS_CTL_IBUSY: -+ err = au_ibusy_compat_ioctl(file, arg); -+ break; -+ -+ case AUFS_CTL_BRINFO: -+ err = au_brinfo_compat_ioctl(file, arg); -+ break; -+ -+ default: -+ err = aufs_ioctl_dir(file, cmd, arg); -+ } -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd, -+ unsigned long arg) -+{ -+ return aufs_ioctl_nondir(file, cmd, (unsigned long)compat_ptr(arg)); -+} -+#endif -diff --git a/fs/aufs/lcnt.h b/fs/aufs/lcnt.h -new file mode 100644 -index 000000000000..d8508f875f28 ---- /dev/null -+++ b/fs/aufs/lcnt.h -@@ -0,0 +1,186 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2018-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * simple long counter wrapper -+ */ -+ -+#ifndef __AUFS_LCNT_H__ -+#define __AUFS_LCNT_H__ -+ -+#ifdef __KERNEL__ -+ -+#include "debug.h" -+ -+#define AuLCntATOMIC 1 -+#define AuLCntPCPUCNT 2 -+/* -+ * why does percpu_refcount require extra synchronize_rcu()s in -+ * au_br_do_free() -+ */ -+#define AuLCntPCPUREF 3 -+ -+/* #define AuLCntChosen AuLCntATOMIC */ -+#define AuLCntChosen AuLCntPCPUCNT -+/* #define AuLCntChosen AuLCntPCPUREF */ -+ -+#if AuLCntChosen == AuLCntATOMIC -+#include <linux/atomic.h> -+ -+typedef atomic_long_t au_lcnt_t; -+ -+static inline int au_lcnt_init(au_lcnt_t *cnt, void *release __maybe_unused) -+{ -+ atomic_long_set(cnt, 0); -+ return 0; -+} -+ -+static inline void au_lcnt_wait_for_fin(au_lcnt_t *cnt __maybe_unused) -+{ -+ /* empty */ -+} -+ -+static inline void au_lcnt_fin(au_lcnt_t *cnt __maybe_unused, -+ int do_sync __maybe_unused) -+{ -+ /* empty */ -+} -+ -+static inline void au_lcnt_inc(au_lcnt_t *cnt) -+{ -+ atomic_long_inc(cnt); -+} -+ -+static inline void au_lcnt_dec(au_lcnt_t *cnt) -+{ -+ atomic_long_dec(cnt); -+} -+ -+static inline long au_lcnt_read(au_lcnt_t *cnt, int do_rev __maybe_unused) -+{ -+ return atomic_long_read(cnt); -+} -+#endif -+ -+#if AuLCntChosen == AuLCntPCPUCNT -+#include <linux/percpu_counter.h> -+ -+typedef struct percpu_counter au_lcnt_t; -+ -+static inline int au_lcnt_init(au_lcnt_t *cnt, void *release __maybe_unused) -+{ -+ return percpu_counter_init(cnt, 0, GFP_NOFS); -+} -+ -+static inline void au_lcnt_wait_for_fin(au_lcnt_t *cnt __maybe_unused) -+{ -+ /* empty */ -+} -+ -+static inline void au_lcnt_fin(au_lcnt_t *cnt, int do_sync __maybe_unused) -+{ -+ percpu_counter_destroy(cnt); -+} -+ -+static inline void au_lcnt_inc(au_lcnt_t *cnt) -+{ -+ percpu_counter_inc(cnt); -+} -+ -+static inline void au_lcnt_dec(au_lcnt_t *cnt) -+{ -+ percpu_counter_dec(cnt); -+} -+ -+static inline long au_lcnt_read(au_lcnt_t *cnt, int do_rev __maybe_unused) -+{ -+ s64 n; -+ -+ n = percpu_counter_sum(cnt); -+ BUG_ON(n < 0); -+ if (LONG_MAX != LLONG_MAX -+ && n > LONG_MAX) -+ AuWarn1("%s\n", "wrap-around"); -+ -+ return n; -+} -+#endif -+ -+#if AuLCntChosen == AuLCntPCPUREF -+#include <linux/percpu-refcount.h> -+ -+typedef struct percpu_ref au_lcnt_t; -+ -+static inline int au_lcnt_init(au_lcnt_t *cnt, percpu_ref_func_t *release) -+{ -+ if (!release) -+ release = percpu_ref_exit; -+ return percpu_ref_init(cnt, release, /*percpu mode*/0, GFP_NOFS); -+} -+ -+static inline void au_lcnt_wait_for_fin(au_lcnt_t *cnt __maybe_unused) -+{ -+ synchronize_rcu(); -+} -+ -+static inline void au_lcnt_fin(au_lcnt_t *cnt, int do_sync) -+{ -+ percpu_ref_kill(cnt); -+ if (do_sync) -+ au_lcnt_wait_for_fin(cnt); -+} -+ -+static inline void au_lcnt_inc(au_lcnt_t *cnt) -+{ -+ percpu_ref_get(cnt); -+} -+ -+static inline void au_lcnt_dec(au_lcnt_t *cnt) -+{ -+ percpu_ref_put(cnt); -+} -+ -+/* -+ * avoid calling this func as possible. -+ */ -+static inline long au_lcnt_read(au_lcnt_t *cnt, int do_rev) -+{ -+ long l; -+ -+ percpu_ref_switch_to_atomic_sync(cnt); -+ l = atomic_long_read(&cnt->count); -+ if (do_rev) -+ percpu_ref_switch_to_percpu(cnt); -+ -+ /* percpu_ref is initialized by 1 instead of 0 */ -+ return l - 1; -+} -+#endif -+ -+#ifdef CONFIG_AUFS_DEBUG -+#define AuLCntZero(val) do { \ -+ long l = val; \ -+ if (l) \ -+ AuDbg("%s = %ld\n", #val, l); \ -+} while (0) -+#else -+#define AuLCntZero(val) do {} while (0) -+#endif -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_LCNT_H__ */ -diff --git a/fs/aufs/loop.c b/fs/aufs/loop.c -new file mode 100644 -index 000000000000..bfcb9f994c2d ---- /dev/null -+++ b/fs/aufs/loop.c -@@ -0,0 +1,148 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * support for loopback block device as a branch -+ */ -+ -+#include "aufs.h" -+ -+/* added into drivers/block/loop.c */ -+static struct file *(*backing_file_func)(struct super_block *sb); -+ -+/* -+ * test if two lower dentries have overlapping branches. -+ */ -+int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding) -+{ -+ struct super_block *h_sb; -+ struct file *backing_file; -+ -+ if (unlikely(!backing_file_func)) { -+ /* don't load "loop" module here */ -+ backing_file_func = symbol_get(loop_backing_file); -+ if (unlikely(!backing_file_func)) -+ /* "loop" module is not loaded */ -+ return 0; -+ } -+ -+ h_sb = h_adding->d_sb; -+ backing_file = backing_file_func(h_sb); -+ if (!backing_file) -+ return 0; -+ -+ h_adding = backing_file->f_path.dentry; -+ /* -+ * h_adding can be local NFS. -+ * in this case aufs cannot detect the loop. -+ */ -+ if (unlikely(h_adding->d_sb == sb)) -+ return 1; -+ return !!au_test_subdir(h_adding, sb->s_root); -+} -+ -+/* true if a kernel thread named 'loop[0-9].*' accesses a file */ -+int au_test_loopback_kthread(void) -+{ -+ int ret; -+ struct task_struct *tsk = current; -+ char c, comm[sizeof(tsk->comm)]; -+ -+ ret = 0; -+ if (tsk->flags & PF_KTHREAD) { -+ get_task_comm(comm, tsk); -+ c = comm[4]; -+ ret = ('0' <= c && c <= '9' -+ && !strncmp(comm, "loop", 4)); -+ } -+ -+ return ret; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+#define au_warn_loopback_step 16 -+static int au_warn_loopback_nelem = au_warn_loopback_step; -+static unsigned long *au_warn_loopback_array; -+ -+void au_warn_loopback(struct super_block *h_sb) -+{ -+ int i, new_nelem; -+ unsigned long *a, magic; -+ static DEFINE_SPINLOCK(spin); -+ -+ magic = h_sb->s_magic; -+ spin_lock(&spin); -+ a = au_warn_loopback_array; -+ for (i = 0; i < au_warn_loopback_nelem && *a; i++) -+ if (a[i] == magic) { -+ spin_unlock(&spin); -+ return; -+ } -+ -+ /* h_sb is new to us, print it */ -+ if (i < au_warn_loopback_nelem) { -+ a[i] = magic; -+ goto pr; -+ } -+ -+ /* expand the array */ -+ new_nelem = au_warn_loopback_nelem + au_warn_loopback_step; -+ a = au_kzrealloc(au_warn_loopback_array, -+ au_warn_loopback_nelem * sizeof(unsigned long), -+ new_nelem * sizeof(unsigned long), GFP_ATOMIC, -+ /*may_shrink*/0); -+ if (a) { -+ au_warn_loopback_nelem = new_nelem; -+ au_warn_loopback_array = a; -+ a[i] = magic; -+ goto pr; -+ } -+ -+ spin_unlock(&spin); -+ AuWarn1("realloc failed, ignored\n"); -+ return; -+ -+pr: -+ spin_unlock(&spin); -+ pr_warn("you may want to try another patch for loopback file " -+ "on %s(0x%lx) branch\n", au_sbtype(h_sb), magic); -+} -+ -+int au_loopback_init(void) -+{ -+ int err; -+ struct super_block *sb __maybe_unused; -+ -+ BUILD_BUG_ON(sizeof(sb->s_magic) != sizeof(*au_warn_loopback_array)); -+ -+ err = 0; -+ au_warn_loopback_array = kcalloc(au_warn_loopback_step, -+ sizeof(unsigned long), GFP_NOFS); -+ if (unlikely(!au_warn_loopback_array)) -+ err = -ENOMEM; -+ -+ return err; -+} -+ -+void au_loopback_fin(void) -+{ -+ if (backing_file_func) -+ symbol_put(loop_backing_file); -+ au_kfree_try_rcu(au_warn_loopback_array); -+} -diff --git a/fs/aufs/loop.h b/fs/aufs/loop.h -new file mode 100644 -index 000000000000..7fc394e72d75 ---- /dev/null -+++ b/fs/aufs/loop.h -@@ -0,0 +1,55 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * support for loopback mount as a branch -+ */ -+ -+#ifndef __AUFS_LOOP_H__ -+#define __AUFS_LOOP_H__ -+ -+#ifdef __KERNEL__ -+ -+struct dentry; -+struct super_block; -+ -+#ifdef CONFIG_AUFS_BDEV_LOOP -+/* drivers/block/loop.c */ -+struct file *loop_backing_file(struct super_block *sb); -+ -+/* loop.c */ -+int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding); -+int au_test_loopback_kthread(void); -+void au_warn_loopback(struct super_block *h_sb); -+ -+int au_loopback_init(void); -+void au_loopback_fin(void); -+#else -+AuStub(struct file *, loop_backing_file, return NULL, struct super_block *sb) -+ -+AuStubInt0(au_test_loopback_overlap, struct super_block *sb, -+ struct dentry *h_adding) -+AuStubInt0(au_test_loopback_kthread, void) -+AuStubVoid(au_warn_loopback, struct super_block *h_sb) -+ -+AuStubInt0(au_loopback_init, void) -+AuStubVoid(au_loopback_fin, void) -+#endif /* BLK_DEV_LOOP */ -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_LOOP_H__ */ -diff --git a/fs/aufs/magic.mk b/fs/aufs/magic.mk -new file mode 100644 -index 000000000000..7bc9eef3ffec ---- /dev/null -+++ b/fs/aufs/magic.mk -@@ -0,0 +1,31 @@ -+# SPDX-License-Identifier: GPL-2.0 -+ -+# defined in ${srctree}/fs/fuse/inode.c -+# tristate -+ifdef CONFIG_FUSE_FS -+ccflags-y += -DFUSE_SUPER_MAGIC=0x65735546 -+endif -+ -+# defined in ${srctree}/fs/xfs/xfs_sb.h -+# tristate -+ifdef CONFIG_XFS_FS -+ccflags-y += -DXFS_SB_MAGIC=0x58465342 -+endif -+ -+# defined in ${srctree}/fs/configfs/mount.c -+# tristate -+ifdef CONFIG_CONFIGFS_FS -+ccflags-y += -DCONFIGFS_MAGIC=0x62656570 -+endif -+ -+# defined in ${srctree}/fs/ubifs/ubifs.h -+# tristate -+ifdef CONFIG_UBIFS_FS -+ccflags-y += -DUBIFS_SUPER_MAGIC=0x24051905 -+endif -+ -+# defined in ${srctree}/fs/hfsplus/hfsplus_raw.h -+# tristate -+ifdef CONFIG_HFSPLUS_FS -+ccflags-y += -DHFSPLUS_SUPER_MAGIC=0x482b -+endif -diff --git a/fs/aufs/module.c b/fs/aufs/module.c -new file mode 100644 -index 000000000000..295736adfc3c ---- /dev/null -+++ b/fs/aufs/module.c -@@ -0,0 +1,273 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * module global variables and operations -+ */ -+ -+#include <linux/module.h> -+#include <linux/seq_file.h> -+#include "aufs.h" -+ -+/* shrinkable realloc */ -+void *au_krealloc(void *p, unsigned int new_sz, gfp_t gfp, int may_shrink) -+{ -+ size_t sz; -+ int diff; -+ -+ sz = 0; -+ diff = -1; -+ if (p) { -+#if 0 /* unused */ -+ if (!new_sz) { -+ au_kfree_rcu(p); -+ p = NULL; -+ goto out; -+ } -+#else -+ AuDebugOn(!new_sz); -+#endif -+ sz = ksize(p); -+ diff = au_kmidx_sub(sz, new_sz); -+ } -+ if (sz && !diff) -+ goto out; -+ -+ if (sz < new_sz) -+ /* expand or SLOB */ -+ p = krealloc(p, new_sz, gfp); -+ else if (new_sz < sz && may_shrink) { -+ /* shrink */ -+ void *q; -+ -+ q = kmalloc(new_sz, gfp); -+ if (q) { -+ if (p) { -+ memcpy(q, p, new_sz); -+ au_kfree_try_rcu(p); -+ } -+ p = q; -+ } else -+ p = NULL; -+ } -+ -+out: -+ return p; -+} -+ -+void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp, -+ int may_shrink) -+{ -+ p = au_krealloc(p, new_sz, gfp, may_shrink); -+ if (p && new_sz > nused) -+ memset(p + nused, 0, new_sz - nused); -+ return p; -+} -+ -+/* ---------------------------------------------------------------------- */ -+/* -+ * aufs caches -+ */ -+struct kmem_cache *au_cache[AuCache_Last]; -+ -+static void au_cache_fin(void) -+{ -+ int i; -+ -+ /* -+ * Make sure all delayed rcu free inodes are flushed before we -+ * destroy cache. -+ */ -+ rcu_barrier(); -+ -+ /* excluding AuCache_HNOTIFY */ -+ BUILD_BUG_ON(AuCache_HNOTIFY + 1 != AuCache_Last); -+ for (i = 0; i < AuCache_HNOTIFY; i++) { -+ kmem_cache_destroy(au_cache[i]); -+ au_cache[i] = NULL; -+ } -+} -+ -+static int __init au_cache_init(void) -+{ -+ au_cache[AuCache_DINFO] = AuCacheCtor(au_dinfo, au_di_init_once); -+ if (au_cache[AuCache_DINFO]) -+ /* SLAB_DESTROY_BY_RCU */ -+ au_cache[AuCache_ICNTNR] = AuCacheCtor(au_icntnr, -+ au_icntnr_init_once); -+ if (au_cache[AuCache_ICNTNR]) -+ au_cache[AuCache_FINFO] = AuCacheCtor(au_finfo, -+ au_fi_init_once); -+ if (au_cache[AuCache_FINFO]) -+ au_cache[AuCache_VDIR] = AuCache(au_vdir); -+ if (au_cache[AuCache_VDIR]) -+ au_cache[AuCache_DEHSTR] = AuCache(au_vdir_dehstr); -+ if (au_cache[AuCache_DEHSTR]) -+ return 0; -+ -+ au_cache_fin(); -+ return -ENOMEM; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int au_dir_roflags; -+ -+#ifdef CONFIG_AUFS_SBILIST -+/* -+ * iterate_supers_type() doesn't protect us from -+ * remounting (branch management) -+ */ -+struct hlist_bl_head au_sbilist; -+#endif -+ -+/* -+ * functions for module interface. -+ */ -+MODULE_LICENSE("GPL"); -+/* MODULE_LICENSE("GPL v2"); */ -+MODULE_AUTHOR("Junjiro R. Okajima <aufs-users@lists.sourceforge.net>"); -+MODULE_DESCRIPTION(AUFS_NAME -+ " -- Advanced multi layered unification filesystem"); -+MODULE_VERSION(AUFS_VERSION); -+MODULE_ALIAS_FS(AUFS_NAME); -+ -+/* this module parameter has no meaning when SYSFS is disabled */ -+int sysaufs_brs = 1; -+MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/si_*/brN"); -+module_param_named(brs, sysaufs_brs, int, 0444); -+ -+/* this module parameter has no meaning when USER_NS is disabled */ -+bool au_userns; -+MODULE_PARM_DESC(allow_userns, "allow unprivileged to mount under userns"); -+module_param_named(allow_userns, au_userns, bool, 0444); -+ -+/* ---------------------------------------------------------------------- */ -+ -+static char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */ -+ -+int au_seq_path(struct seq_file *seq, struct path *path) -+{ -+ int err; -+ -+ err = seq_path(seq, path, au_esc_chars); -+ if (err >= 0) -+ err = 0; -+ else -+ err = -ENOMEM; -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int __init aufs_init(void) -+{ -+ int err, i; -+ char *p; -+ -+ p = au_esc_chars; -+ for (i = 1; i <= ' '; i++) -+ *p++ = i; -+ *p++ = '\\'; -+ *p++ = '\x7f'; -+ *p = 0; -+ -+ au_dir_roflags = au_file_roflags(O_DIRECTORY | O_LARGEFILE); -+ -+ memcpy(aufs_iop_nogetattr, aufs_iop, sizeof(aufs_iop)); -+ for (i = 0; i < AuIop_Last; i++) -+ aufs_iop_nogetattr[i].getattr = NULL; -+ -+ memset(au_cache, 0, sizeof(au_cache)); /* including hnotify */ -+ -+ au_sbilist_init(); -+ sysaufs_brs_init(); -+ au_debug_init(); -+ au_dy_init(); -+ err = sysaufs_init(); -+ if (unlikely(err)) -+ goto out; -+ err = dbgaufs_init(); -+ if (unlikely(err)) -+ goto out_sysaufs; -+ err = au_procfs_init(); -+ if (unlikely(err)) -+ goto out_dbgaufs; -+ err = au_wkq_init(); -+ if (unlikely(err)) -+ goto out_procfs; -+ err = au_loopback_init(); -+ if (unlikely(err)) -+ goto out_wkq; -+ err = au_hnotify_init(); -+ if (unlikely(err)) -+ goto out_loopback; -+ err = au_sysrq_init(); -+ if (unlikely(err)) -+ goto out_hin; -+ err = au_cache_init(); -+ if (unlikely(err)) -+ goto out_sysrq; -+ -+ aufs_fs_type.fs_flags |= au_userns ? FS_USERNS_MOUNT : 0; -+ err = register_filesystem(&aufs_fs_type); -+ if (unlikely(err)) -+ goto out_cache; -+ -+ /* since we define pr_fmt, call printk directly */ -+ printk(KERN_INFO AUFS_NAME " " AUFS_VERSION "\n"); -+ goto out; /* success */ -+ -+out_cache: -+ au_cache_fin(); -+out_sysrq: -+ au_sysrq_fin(); -+out_hin: -+ au_hnotify_fin(); -+out_loopback: -+ au_loopback_fin(); -+out_wkq: -+ au_wkq_fin(); -+out_procfs: -+ au_procfs_fin(); -+out_dbgaufs: -+ dbgaufs_fin(); -+out_sysaufs: -+ sysaufs_fin(); -+ au_dy_fin(); -+out: -+ return err; -+} -+ -+static void __exit aufs_exit(void) -+{ -+ unregister_filesystem(&aufs_fs_type); -+ au_cache_fin(); -+ au_sysrq_fin(); -+ au_hnotify_fin(); -+ au_loopback_fin(); -+ au_wkq_fin(); -+ au_procfs_fin(); -+ dbgaufs_fin(); -+ sysaufs_fin(); -+ au_dy_fin(); -+} -+ -+module_init(aufs_init); -+module_exit(aufs_exit); -diff --git a/fs/aufs/module.h b/fs/aufs/module.h -new file mode 100644 -index 000000000000..3036754b90d0 ---- /dev/null -+++ b/fs/aufs/module.h -@@ -0,0 +1,166 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * module initialization and module-global -+ */ -+ -+#ifndef __AUFS_MODULE_H__ -+#define __AUFS_MODULE_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/slab.h> -+#include "debug.h" -+#include "dentry.h" -+#include "dir.h" -+#include "file.h" -+#include "inode.h" -+ -+struct path; -+struct seq_file; -+ -+/* module parameters */ -+extern int sysaufs_brs; -+extern bool au_userns; -+ -+/* ---------------------------------------------------------------------- */ -+ -+extern int au_dir_roflags; -+ -+void *au_krealloc(void *p, unsigned int new_sz, gfp_t gfp, int may_shrink); -+void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp, -+ int may_shrink); -+ -+/* -+ * Comparing the size of the object with sizeof(struct rcu_head) -+ * case 1: object is always larger -+ * --> au_kfree_rcu() or au_kfree_do_rcu() -+ * case 2: object is always smaller -+ * --> au_kfree_small() -+ * case 3: object can be any size -+ * --> au_kfree_try_rcu() -+ */ -+ -+static inline void au_kfree_do_rcu(const void *p) -+{ -+ struct { -+ struct rcu_head rcu; -+ } *a = (void *)p; -+ -+ kfree_rcu(a, rcu); -+} -+ -+#define au_kfree_rcu(_p) do { \ -+ typeof(_p) p = (_p); \ -+ BUILD_BUG_ON(sizeof(*p) < sizeof(struct rcu_head)); \ -+ if (p) \ -+ au_kfree_do_rcu(p); \ -+ } while (0) -+ -+#define au_kfree_do_sz_test(sz) (sz >= sizeof(struct rcu_head)) -+#define au_kfree_sz_test(p) (p && au_kfree_do_sz_test(ksize(p))) -+ -+static inline void au_kfree_try_rcu(const void *p) -+{ -+ if (!p) -+ return; -+ if (au_kfree_sz_test(p)) -+ au_kfree_do_rcu(p); -+ else -+ kfree(p); -+} -+ -+static inline void au_kfree_small(const void *p) -+{ -+ if (!p) -+ return; -+ AuDebugOn(au_kfree_sz_test(p)); -+ kfree(p); -+} -+ -+static inline int au_kmidx_sub(size_t sz, size_t new_sz) -+{ -+#ifndef CONFIG_SLOB -+ return kmalloc_index(sz) - kmalloc_index(new_sz); -+#else -+ return -1; /* SLOB is untested */ -+#endif -+} -+ -+int au_seq_path(struct seq_file *seq, struct path *path); -+ -+#ifdef CONFIG_PROC_FS -+/* procfs.c */ -+int __init au_procfs_init(void); -+void au_procfs_fin(void); -+#else -+AuStubInt0(au_procfs_init, void); -+AuStubVoid(au_procfs_fin, void); -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* kmem cache */ -+enum { -+ AuCache_DINFO, -+ AuCache_ICNTNR, -+ AuCache_FINFO, -+ AuCache_VDIR, -+ AuCache_DEHSTR, -+ AuCache_HNOTIFY, /* must be last */ -+ AuCache_Last -+}; -+ -+extern struct kmem_cache *au_cache[AuCache_Last]; -+ -+#define AuCacheFlags (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD) -+#define AuCache(type) KMEM_CACHE(type, AuCacheFlags) -+#define AuCacheCtor(type, ctor) \ -+ kmem_cache_create(#type, sizeof(struct type), \ -+ __alignof__(struct type), AuCacheFlags, ctor) -+ -+#define AuCacheFuncs(name, index) \ -+ static inline struct au_##name *au_cache_alloc_##name(void) \ -+ { return kmem_cache_alloc(au_cache[AuCache_##index], GFP_NOFS); } \ -+ static inline void au_cache_free_##name##_norcu(struct au_##name *p) \ -+ { kmem_cache_free(au_cache[AuCache_##index], p); } \ -+ \ -+ static inline void au_cache_free_##name##_rcu_cb(struct rcu_head *rcu) \ -+ { void *p = rcu; \ -+ p -= offsetof(struct au_##name, rcu); \ -+ kmem_cache_free(au_cache[AuCache_##index], p); } \ -+ static inline void au_cache_free_##name##_rcu(struct au_##name *p) \ -+ { BUILD_BUG_ON(sizeof(struct au_##name) < sizeof(struct rcu_head)); \ -+ call_rcu(&p->rcu, au_cache_free_##name##_rcu_cb); } \ -+ \ -+ static inline void au_cache_free_##name(struct au_##name *p) \ -+ { /* au_cache_free_##name##_norcu(p); */ \ -+ au_cache_free_##name##_rcu(p); } -+ -+AuCacheFuncs(dinfo, DINFO); -+AuCacheFuncs(icntnr, ICNTNR); -+AuCacheFuncs(finfo, FINFO); -+AuCacheFuncs(vdir, VDIR); -+AuCacheFuncs(vdir_dehstr, DEHSTR); -+#ifdef CONFIG_AUFS_HNOTIFY -+AuCacheFuncs(hnotify, HNOTIFY); -+#endif -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_MODULE_H__ */ -diff --git a/fs/aufs/mvdown.c b/fs/aufs/mvdown.c -new file mode 100644 -index 000000000000..cbac849ead31 ---- /dev/null -+++ b/fs/aufs/mvdown.c -@@ -0,0 +1,706 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2011-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * move-down, opposite of copy-up -+ */ -+ -+#include "aufs.h" -+ -+struct au_mvd_args { -+ struct { -+ struct super_block *h_sb; -+ struct dentry *h_parent; -+ struct au_hinode *hdir; -+ struct inode *h_dir, *h_inode; -+ struct au_pin pin; -+ } info[AUFS_MVDOWN_NARRAY]; -+ -+ struct aufs_mvdown mvdown; -+ struct dentry *dentry, *parent; -+ struct inode *inode, *dir; -+ struct super_block *sb; -+ aufs_bindex_t bopq, bwh, bfound; -+ unsigned char rename_lock; -+}; -+ -+#define mvd_errno mvdown.au_errno -+#define mvd_bsrc mvdown.stbr[AUFS_MVDOWN_UPPER].bindex -+#define mvd_src_brid mvdown.stbr[AUFS_MVDOWN_UPPER].brid -+#define mvd_bdst mvdown.stbr[AUFS_MVDOWN_LOWER].bindex -+#define mvd_dst_brid mvdown.stbr[AUFS_MVDOWN_LOWER].brid -+ -+#define mvd_h_src_sb info[AUFS_MVDOWN_UPPER].h_sb -+#define mvd_h_src_parent info[AUFS_MVDOWN_UPPER].h_parent -+#define mvd_hdir_src info[AUFS_MVDOWN_UPPER].hdir -+#define mvd_h_src_dir info[AUFS_MVDOWN_UPPER].h_dir -+#define mvd_h_src_inode info[AUFS_MVDOWN_UPPER].h_inode -+#define mvd_pin_src info[AUFS_MVDOWN_UPPER].pin -+ -+#define mvd_h_dst_sb info[AUFS_MVDOWN_LOWER].h_sb -+#define mvd_h_dst_parent info[AUFS_MVDOWN_LOWER].h_parent -+#define mvd_hdir_dst info[AUFS_MVDOWN_LOWER].hdir -+#define mvd_h_dst_dir info[AUFS_MVDOWN_LOWER].h_dir -+#define mvd_h_dst_inode info[AUFS_MVDOWN_LOWER].h_inode -+#define mvd_pin_dst info[AUFS_MVDOWN_LOWER].pin -+ -+#define AU_MVD_PR(flag, ...) do { \ -+ if (flag) \ -+ pr_err(__VA_ARGS__); \ -+ } while (0) -+ -+static int find_lower_writable(struct au_mvd_args *a) -+{ -+ struct super_block *sb; -+ aufs_bindex_t bindex, bbot; -+ struct au_branch *br; -+ -+ sb = a->sb; -+ bindex = a->mvd_bsrc; -+ bbot = au_sbbot(sb); -+ if (a->mvdown.flags & AUFS_MVDOWN_FHSM_LOWER) -+ for (bindex++; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ if (au_br_fhsm(br->br_perm) -+ && !sb_rdonly(au_br_sb(br))) -+ return bindex; -+ } -+ else if (!(a->mvdown.flags & AUFS_MVDOWN_ROLOWER)) -+ for (bindex++; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ if (!au_br_rdonly(br)) -+ return bindex; -+ } -+ else -+ for (bindex++; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ if (!sb_rdonly(au_br_sb(br))) { -+ if (au_br_rdonly(br)) -+ a->mvdown.flags -+ |= AUFS_MVDOWN_ROLOWER_R; -+ return bindex; -+ } -+ } -+ -+ return -1; -+} -+ -+/* make the parent dir on bdst */ -+static int au_do_mkdir(const unsigned char dmsg, struct au_mvd_args *a) -+{ -+ int err; -+ -+ err = 0; -+ a->mvd_hdir_src = au_hi(a->dir, a->mvd_bsrc); -+ a->mvd_hdir_dst = au_hi(a->dir, a->mvd_bdst); -+ a->mvd_h_src_parent = au_h_dptr(a->parent, a->mvd_bsrc); -+ a->mvd_h_dst_parent = NULL; -+ if (au_dbbot(a->parent) >= a->mvd_bdst) -+ a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst); -+ if (!a->mvd_h_dst_parent) { -+ err = au_cpdown_dirs(a->dentry, a->mvd_bdst); -+ if (unlikely(err)) { -+ AU_MVD_PR(dmsg, "cpdown_dirs failed\n"); -+ goto out; -+ } -+ a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst); -+ } -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* lock them all */ -+static int au_do_lock(const unsigned char dmsg, struct au_mvd_args *a) -+{ -+ int err; -+ struct dentry *h_trap; -+ -+ a->mvd_h_src_sb = au_sbr_sb(a->sb, a->mvd_bsrc); -+ a->mvd_h_dst_sb = au_sbr_sb(a->sb, a->mvd_bdst); -+ err = au_pin(&a->mvd_pin_dst, a->dentry, a->mvd_bdst, -+ au_opt_udba(a->sb), -+ AuPin_MNT_WRITE | AuPin_DI_LOCKED); -+ AuTraceErr(err); -+ if (unlikely(err)) { -+ AU_MVD_PR(dmsg, "pin_dst failed\n"); -+ goto out; -+ } -+ -+ if (a->mvd_h_src_sb != a->mvd_h_dst_sb) { -+ a->rename_lock = 0; -+ au_pin_init(&a->mvd_pin_src, a->dentry, a->mvd_bsrc, -+ AuLsc_DI_PARENT, AuLsc_I_PARENT3, -+ au_opt_udba(a->sb), -+ AuPin_MNT_WRITE | AuPin_DI_LOCKED); -+ err = au_do_pin(&a->mvd_pin_src); -+ AuTraceErr(err); -+ a->mvd_h_src_dir = d_inode(a->mvd_h_src_parent); -+ if (unlikely(err)) { -+ AU_MVD_PR(dmsg, "pin_src failed\n"); -+ goto out_dst; -+ } -+ goto out; /* success */ -+ } -+ -+ a->rename_lock = 1; -+ au_pin_hdir_unlock(&a->mvd_pin_dst); -+ err = au_pin(&a->mvd_pin_src, a->dentry, a->mvd_bsrc, -+ au_opt_udba(a->sb), -+ AuPin_MNT_WRITE | AuPin_DI_LOCKED); -+ AuTraceErr(err); -+ a->mvd_h_src_dir = d_inode(a->mvd_h_src_parent); -+ if (unlikely(err)) { -+ AU_MVD_PR(dmsg, "pin_src failed\n"); -+ au_pin_hdir_lock(&a->mvd_pin_dst); -+ goto out_dst; -+ } -+ au_pin_hdir_unlock(&a->mvd_pin_src); -+ h_trap = vfsub_lock_rename(a->mvd_h_src_parent, a->mvd_hdir_src, -+ a->mvd_h_dst_parent, a->mvd_hdir_dst); -+ if (h_trap) { -+ err = (h_trap != a->mvd_h_src_parent); -+ if (err) -+ err = (h_trap != a->mvd_h_dst_parent); -+ } -+ BUG_ON(err); /* it should never happen */ -+ if (unlikely(a->mvd_h_src_dir != au_pinned_h_dir(&a->mvd_pin_src))) { -+ err = -EBUSY; -+ AuTraceErr(err); -+ vfsub_unlock_rename(a->mvd_h_src_parent, a->mvd_hdir_src, -+ a->mvd_h_dst_parent, a->mvd_hdir_dst); -+ au_pin_hdir_lock(&a->mvd_pin_src); -+ au_unpin(&a->mvd_pin_src); -+ au_pin_hdir_lock(&a->mvd_pin_dst); -+ goto out_dst; -+ } -+ goto out; /* success */ -+ -+out_dst: -+ au_unpin(&a->mvd_pin_dst); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+static void au_do_unlock(const unsigned char dmsg, struct au_mvd_args *a) -+{ -+ if (!a->rename_lock) -+ au_unpin(&a->mvd_pin_src); -+ else { -+ vfsub_unlock_rename(a->mvd_h_src_parent, a->mvd_hdir_src, -+ a->mvd_h_dst_parent, a->mvd_hdir_dst); -+ au_pin_hdir_lock(&a->mvd_pin_src); -+ au_unpin(&a->mvd_pin_src); -+ au_pin_hdir_lock(&a->mvd_pin_dst); -+ } -+ au_unpin(&a->mvd_pin_dst); -+} -+ -+/* copy-down the file */ -+static int au_do_cpdown(const unsigned char dmsg, struct au_mvd_args *a) -+{ -+ int err; -+ struct au_cp_generic cpg = { -+ .dentry = a->dentry, -+ .bdst = a->mvd_bdst, -+ .bsrc = a->mvd_bsrc, -+ .len = -1, -+ .pin = &a->mvd_pin_dst, -+ .flags = AuCpup_DTIME | AuCpup_HOPEN -+ }; -+ -+ AuDbg("b%d, b%d\n", cpg.bsrc, cpg.bdst); -+ if (a->mvdown.flags & AUFS_MVDOWN_OWLOWER) -+ au_fset_cpup(cpg.flags, OVERWRITE); -+ if (a->mvdown.flags & AUFS_MVDOWN_ROLOWER) -+ au_fset_cpup(cpg.flags, RWDST); -+ err = au_sio_cpdown_simple(&cpg); -+ if (unlikely(err)) -+ AU_MVD_PR(dmsg, "cpdown failed\n"); -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+/* -+ * unlink the whiteout on bdst if exist which may be created by UDBA while we -+ * were sleeping -+ */ -+static int au_do_unlink_wh(const unsigned char dmsg, struct au_mvd_args *a) -+{ -+ int err; -+ struct path h_path; -+ struct au_branch *br; -+ struct inode *delegated; -+ -+ br = au_sbr(a->sb, a->mvd_bdst); -+ h_path.dentry = au_wh_lkup(a->mvd_h_dst_parent, &a->dentry->d_name, br); -+ err = PTR_ERR(h_path.dentry); -+ if (IS_ERR(h_path.dentry)) { -+ AU_MVD_PR(dmsg, "wh_lkup failed\n"); -+ goto out; -+ } -+ -+ err = 0; -+ if (d_is_positive(h_path.dentry)) { -+ h_path.mnt = au_br_mnt(br); -+ delegated = NULL; -+ err = vfsub_unlink(d_inode(a->mvd_h_dst_parent), &h_path, -+ &delegated, /*force*/0); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal unlink\n"); -+ iput(delegated); -+ } -+ if (unlikely(err)) -+ AU_MVD_PR(dmsg, "wh_unlink failed\n"); -+ } -+ dput(h_path.dentry); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* -+ * unlink the topmost h_dentry -+ */ -+static int au_do_unlink(const unsigned char dmsg, struct au_mvd_args *a) -+{ -+ int err; -+ struct path h_path; -+ struct inode *delegated; -+ -+ h_path.mnt = au_sbr_mnt(a->sb, a->mvd_bsrc); -+ h_path.dentry = au_h_dptr(a->dentry, a->mvd_bsrc); -+ delegated = NULL; -+ err = vfsub_unlink(a->mvd_h_src_dir, &h_path, &delegated, /*force*/0); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal unlink\n"); -+ iput(delegated); -+ } -+ if (unlikely(err)) -+ AU_MVD_PR(dmsg, "unlink failed\n"); -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+/* Since mvdown succeeded, we ignore an error of this function */ -+static void au_do_stfs(const unsigned char dmsg, struct au_mvd_args *a) -+{ -+ int err; -+ struct au_branch *br; -+ -+ a->mvdown.flags |= AUFS_MVDOWN_STFS_FAILED; -+ br = au_sbr(a->sb, a->mvd_bsrc); -+ err = au_br_stfs(br, &a->mvdown.stbr[AUFS_MVDOWN_UPPER].stfs); -+ if (!err) { -+ br = au_sbr(a->sb, a->mvd_bdst); -+ a->mvdown.stbr[AUFS_MVDOWN_LOWER].brid = br->br_id; -+ err = au_br_stfs(br, &a->mvdown.stbr[AUFS_MVDOWN_LOWER].stfs); -+ } -+ if (!err) -+ a->mvdown.flags &= ~AUFS_MVDOWN_STFS_FAILED; -+ else -+ AU_MVD_PR(dmsg, "statfs failed (%d), ignored\n", err); -+} -+ -+/* -+ * copy-down the file and unlink the bsrc file. -+ * - unlink the bdst whout if exist -+ * - copy-down the file (with whtmp name and rename) -+ * - unlink the bsrc file -+ */ -+static int au_do_mvdown(const unsigned char dmsg, struct au_mvd_args *a) -+{ -+ int err; -+ -+ err = au_do_mkdir(dmsg, a); -+ if (!err) -+ err = au_do_lock(dmsg, a); -+ if (unlikely(err)) -+ goto out; -+ -+ /* -+ * do not revert the activities we made on bdst since they should be -+ * harmless in aufs. -+ */ -+ -+ err = au_do_cpdown(dmsg, a); -+ if (!err) -+ err = au_do_unlink_wh(dmsg, a); -+ if (!err && !(a->mvdown.flags & AUFS_MVDOWN_KUPPER)) -+ err = au_do_unlink(dmsg, a); -+ if (unlikely(err)) -+ goto out_unlock; -+ -+ AuDbg("%pd2, 0x%x, %d --> %d\n", -+ a->dentry, a->mvdown.flags, a->mvd_bsrc, a->mvd_bdst); -+ if (find_lower_writable(a) < 0) -+ a->mvdown.flags |= AUFS_MVDOWN_BOTTOM; -+ -+ if (a->mvdown.flags & AUFS_MVDOWN_STFS) -+ au_do_stfs(dmsg, a); -+ -+ /* maintain internal array */ -+ if (!(a->mvdown.flags & AUFS_MVDOWN_KUPPER)) { -+ au_set_h_dptr(a->dentry, a->mvd_bsrc, NULL); -+ au_set_dbtop(a->dentry, a->mvd_bdst); -+ au_set_h_iptr(a->inode, a->mvd_bsrc, NULL, /*flags*/0); -+ au_set_ibtop(a->inode, a->mvd_bdst); -+ } else { -+ /* hide the lower */ -+ au_set_h_dptr(a->dentry, a->mvd_bdst, NULL); -+ au_set_dbbot(a->dentry, a->mvd_bsrc); -+ au_set_h_iptr(a->inode, a->mvd_bdst, NULL, /*flags*/0); -+ au_set_ibbot(a->inode, a->mvd_bsrc); -+ } -+ if (au_dbbot(a->dentry) < a->mvd_bdst) -+ au_set_dbbot(a->dentry, a->mvd_bdst); -+ if (au_ibbot(a->inode) < a->mvd_bdst) -+ au_set_ibbot(a->inode, a->mvd_bdst); -+ -+out_unlock: -+ au_do_unlock(dmsg, a); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* make sure the file is idle */ -+static int au_mvd_args_busy(const unsigned char dmsg, struct au_mvd_args *a) -+{ -+ int err, plinked; -+ -+ err = 0; -+ plinked = !!au_opt_test(au_mntflags(a->sb), PLINK); -+ if (au_dbtop(a->dentry) == a->mvd_bsrc -+ && au_dcount(a->dentry) == 1 -+ && atomic_read(&a->inode->i_count) == 1 -+ /* && a->mvd_h_src_inode->i_nlink == 1 */ -+ && (!plinked || !au_plink_test(a->inode)) -+ && a->inode->i_nlink == 1) -+ goto out; -+ -+ err = -EBUSY; -+ AU_MVD_PR(dmsg, -+ "b%d, d{b%d, c%d?}, i{c%d?, l%u}, hi{l%u}, p{%d, %d}\n", -+ a->mvd_bsrc, au_dbtop(a->dentry), au_dcount(a->dentry), -+ atomic_read(&a->inode->i_count), a->inode->i_nlink, -+ a->mvd_h_src_inode->i_nlink, -+ plinked, plinked ? au_plink_test(a->inode) : 0); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* make sure the parent dir is fine */ -+static int au_mvd_args_parent(const unsigned char dmsg, -+ struct au_mvd_args *a) -+{ -+ int err; -+ aufs_bindex_t bindex; -+ -+ err = 0; -+ if (unlikely(au_alive_dir(a->parent))) { -+ err = -ENOENT; -+ AU_MVD_PR(dmsg, "parent dir is dead\n"); -+ goto out; -+ } -+ -+ a->bopq = au_dbdiropq(a->parent); -+ bindex = au_wbr_nonopq(a->dentry, a->mvd_bdst); -+ AuDbg("b%d\n", bindex); -+ if (unlikely((bindex >= 0 && bindex < a->mvd_bdst) -+ || (a->bopq != -1 && a->bopq < a->mvd_bdst))) { -+ err = -EINVAL; -+ a->mvd_errno = EAU_MVDOWN_OPAQUE; -+ AU_MVD_PR(dmsg, "ancestor is opaque b%d, b%d\n", -+ a->bopq, a->mvd_bdst); -+ } -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+static int au_mvd_args_intermediate(const unsigned char dmsg, -+ struct au_mvd_args *a) -+{ -+ int err; -+ struct au_dinfo *dinfo, *tmp; -+ -+ /* lookup the next lower positive entry */ -+ err = -ENOMEM; -+ tmp = au_di_alloc(a->sb, AuLsc_DI_TMP); -+ if (unlikely(!tmp)) -+ goto out; -+ -+ a->bfound = -1; -+ a->bwh = -1; -+ dinfo = au_di(a->dentry); -+ au_di_cp(tmp, dinfo); -+ au_di_swap(tmp, dinfo); -+ -+ /* returns the number of positive dentries */ -+ err = au_lkup_dentry(a->dentry, a->mvd_bsrc + 1, -+ /* AuLkup_IGNORE_PERM */ 0); -+ if (!err) -+ a->bwh = au_dbwh(a->dentry); -+ else if (err > 0) -+ a->bfound = au_dbtop(a->dentry); -+ -+ au_di_swap(tmp, dinfo); -+ au_rw_write_unlock(&tmp->di_rwsem); -+ au_di_free(tmp); -+ if (unlikely(err < 0)) -+ AU_MVD_PR(dmsg, "failed look-up lower\n"); -+ -+ /* -+ * here, we have these cases. -+ * bfound == -1 -+ * no positive dentry under bsrc. there are more sub-cases. -+ * bwh < 0 -+ * there no whiteout, we can safely move-down. -+ * bwh <= bsrc -+ * impossible -+ * bsrc < bwh && bwh < bdst -+ * there is a whiteout on RO branch. cannot proceed. -+ * bwh == bdst -+ * there is a whiteout on the RW target branch. it should -+ * be removed. -+ * bdst < bwh -+ * there is a whiteout somewhere unrelated branch. -+ * -1 < bfound && bfound <= bsrc -+ * impossible. -+ * bfound < bdst -+ * found, but it is on RO branch between bsrc and bdst. cannot -+ * proceed. -+ * bfound == bdst -+ * found, replace it if AUFS_MVDOWN_FORCE is set. otherwise return -+ * error. -+ * bdst < bfound -+ * found, after we create the file on bdst, it will be hidden. -+ */ -+ -+ AuDebugOn(a->bfound == -1 -+ && a->bwh != -1 -+ && a->bwh <= a->mvd_bsrc); -+ AuDebugOn(-1 < a->bfound -+ && a->bfound <= a->mvd_bsrc); -+ -+ err = -EINVAL; -+ if (a->bfound == -1 -+ && a->mvd_bsrc < a->bwh -+ && a->bwh != -1 -+ && a->bwh < a->mvd_bdst) { -+ a->mvd_errno = EAU_MVDOWN_WHITEOUT; -+ AU_MVD_PR(dmsg, "bsrc %d, bdst %d, bfound %d, bwh %d\n", -+ a->mvd_bsrc, a->mvd_bdst, a->bfound, a->bwh); -+ goto out; -+ } else if (a->bfound != -1 && a->bfound < a->mvd_bdst) { -+ a->mvd_errno = EAU_MVDOWN_UPPER; -+ AU_MVD_PR(dmsg, "bdst %d, bfound %d\n", -+ a->mvd_bdst, a->bfound); -+ goto out; -+ } -+ -+ err = 0; /* success */ -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+static int au_mvd_args_exist(const unsigned char dmsg, struct au_mvd_args *a) -+{ -+ int err; -+ -+ err = 0; -+ if (!(a->mvdown.flags & AUFS_MVDOWN_OWLOWER) -+ && a->bfound == a->mvd_bdst) -+ err = -EEXIST; -+ AuTraceErr(err); -+ return err; -+} -+ -+static int au_mvd_args(const unsigned char dmsg, struct au_mvd_args *a) -+{ -+ int err; -+ struct au_branch *br; -+ -+ err = -EISDIR; -+ if (unlikely(S_ISDIR(a->inode->i_mode))) -+ goto out; -+ -+ err = -EINVAL; -+ if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_UPPER)) -+ a->mvd_bsrc = au_ibtop(a->inode); -+ else { -+ a->mvd_bsrc = au_br_index(a->sb, a->mvd_src_brid); -+ if (unlikely(a->mvd_bsrc < 0 -+ || (a->mvd_bsrc < au_dbtop(a->dentry) -+ || au_dbbot(a->dentry) < a->mvd_bsrc -+ || !au_h_dptr(a->dentry, a->mvd_bsrc)) -+ || (a->mvd_bsrc < au_ibtop(a->inode) -+ || au_ibbot(a->inode) < a->mvd_bsrc -+ || !au_h_iptr(a->inode, a->mvd_bsrc)))) { -+ a->mvd_errno = EAU_MVDOWN_NOUPPER; -+ AU_MVD_PR(dmsg, "no upper\n"); -+ goto out; -+ } -+ } -+ if (unlikely(a->mvd_bsrc == au_sbbot(a->sb))) { -+ a->mvd_errno = EAU_MVDOWN_BOTTOM; -+ AU_MVD_PR(dmsg, "on the bottom\n"); -+ goto out; -+ } -+ a->mvd_h_src_inode = au_h_iptr(a->inode, a->mvd_bsrc); -+ br = au_sbr(a->sb, a->mvd_bsrc); -+ err = au_br_rdonly(br); -+ if (!(a->mvdown.flags & AUFS_MVDOWN_ROUPPER)) { -+ if (unlikely(err)) -+ goto out; -+ } else if (!(vfsub_native_ro(a->mvd_h_src_inode) -+ || IS_APPEND(a->mvd_h_src_inode))) { -+ if (err) -+ a->mvdown.flags |= AUFS_MVDOWN_ROUPPER_R; -+ /* go on */ -+ } else -+ goto out; -+ -+ err = -EINVAL; -+ if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_LOWER)) { -+ a->mvd_bdst = find_lower_writable(a); -+ if (unlikely(a->mvd_bdst < 0)) { -+ a->mvd_errno = EAU_MVDOWN_BOTTOM; -+ AU_MVD_PR(dmsg, "no writable lower branch\n"); -+ goto out; -+ } -+ } else { -+ a->mvd_bdst = au_br_index(a->sb, a->mvd_dst_brid); -+ if (unlikely(a->mvd_bdst < 0 -+ || au_sbbot(a->sb) < a->mvd_bdst)) { -+ a->mvd_errno = EAU_MVDOWN_NOLOWERBR; -+ AU_MVD_PR(dmsg, "no lower brid\n"); -+ goto out; -+ } -+ } -+ -+ err = au_mvd_args_busy(dmsg, a); -+ if (!err) -+ err = au_mvd_args_parent(dmsg, a); -+ if (!err) -+ err = au_mvd_args_intermediate(dmsg, a); -+ if (!err) -+ err = au_mvd_args_exist(dmsg, a); -+ if (!err) -+ AuDbg("b%d, b%d\n", a->mvd_bsrc, a->mvd_bdst); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+int au_mvdown(struct dentry *dentry, struct aufs_mvdown __user *uarg) -+{ -+ int err, e; -+ unsigned char dmsg; -+ struct au_mvd_args *args; -+ struct inode *inode; -+ -+ inode = d_inode(dentry); -+ err = -EPERM; -+ if (unlikely(!capable(CAP_SYS_ADMIN))) -+ goto out; -+ -+ err = -ENOMEM; -+ args = kmalloc(sizeof(*args), GFP_NOFS); -+ if (unlikely(!args)) -+ goto out; -+ -+ err = copy_from_user(&args->mvdown, uarg, sizeof(args->mvdown)); -+ if (!err) -+ /* VERIFY_WRITE */ -+ err = !access_ok(uarg, sizeof(*uarg)); -+ if (unlikely(err)) { -+ err = -EFAULT; -+ AuTraceErr(err); -+ goto out_free; -+ } -+ AuDbg("flags 0x%x\n", args->mvdown.flags); -+ args->mvdown.flags &= ~(AUFS_MVDOWN_ROLOWER_R | AUFS_MVDOWN_ROUPPER_R); -+ args->mvdown.au_errno = 0; -+ args->dentry = dentry; -+ args->inode = inode; -+ args->sb = dentry->d_sb; -+ -+ err = -ENOENT; -+ dmsg = !!(args->mvdown.flags & AUFS_MVDOWN_DMSG); -+ args->parent = dget_parent(dentry); -+ args->dir = d_inode(args->parent); -+ inode_lock_nested(args->dir, I_MUTEX_PARENT); -+ dput(args->parent); -+ if (unlikely(args->parent != dentry->d_parent)) { -+ AU_MVD_PR(dmsg, "parent dir is moved\n"); -+ goto out_dir; -+ } -+ -+ inode_lock_nested(inode, I_MUTEX_CHILD); -+ err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_NOPLMW); -+ if (unlikely(err)) -+ goto out_inode; -+ -+ di_write_lock_parent(args->parent); -+ err = au_mvd_args(dmsg, args); -+ if (unlikely(err)) -+ goto out_parent; -+ -+ err = au_do_mvdown(dmsg, args); -+ if (unlikely(err)) -+ goto out_parent; -+ -+ au_cpup_attr_timesizes(args->dir); -+ au_cpup_attr_timesizes(inode); -+ if (!(args->mvdown.flags & AUFS_MVDOWN_KUPPER)) -+ au_cpup_igen(inode, au_h_iptr(inode, args->mvd_bdst)); -+ /* au_digen_dec(dentry); */ -+ -+out_parent: -+ di_write_unlock(args->parent); -+ aufs_read_unlock(dentry, AuLock_DW); -+out_inode: -+ inode_unlock(inode); -+out_dir: -+ inode_unlock(args->dir); -+out_free: -+ e = copy_to_user(uarg, &args->mvdown, sizeof(args->mvdown)); -+ if (unlikely(e)) -+ err = -EFAULT; -+ au_kfree_rcu(args); -+out: -+ AuTraceErr(err); -+ return err; -+} -diff --git a/fs/aufs/opts.c b/fs/aufs/opts.c -new file mode 100644 -index 000000000000..c92ca14574ff ---- /dev/null -+++ b/fs/aufs/opts.c -@@ -0,0 +1,1877 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * mount options/flags -+ */ -+ -+#include <linux/namei.h> -+#include <linux/types.h> /* a distribution requires */ -+#include <linux/parser.h> -+#include "aufs.h" -+ -+/* ---------------------------------------------------------------------- */ -+ -+enum { -+ Opt_br, -+ Opt_add, Opt_del, Opt_mod, Opt_append, Opt_prepend, -+ Opt_idel, Opt_imod, -+ Opt_dirwh, Opt_rdcache, Opt_rdblk, Opt_rdhash, -+ Opt_rdblk_def, Opt_rdhash_def, -+ Opt_xino, Opt_noxino, -+ Opt_trunc_xino, Opt_trunc_xino_v, Opt_notrunc_xino, -+ Opt_trunc_xino_path, Opt_itrunc_xino, -+ Opt_trunc_xib, Opt_notrunc_xib, -+ Opt_shwh, Opt_noshwh, -+ Opt_plink, Opt_noplink, Opt_list_plink, -+ Opt_udba, -+ Opt_dio, Opt_nodio, -+ Opt_diropq_a, Opt_diropq_w, -+ Opt_warn_perm, Opt_nowarn_perm, -+ Opt_wbr_copyup, Opt_wbr_create, -+ Opt_fhsm_sec, -+ Opt_verbose, Opt_noverbose, -+ Opt_sum, Opt_nosum, Opt_wsum, -+ Opt_dirperm1, Opt_nodirperm1, -+ Opt_dirren, Opt_nodirren, -+ Opt_acl, Opt_noacl, -+ Opt_tail, Opt_ignore, Opt_ignore_silent, Opt_err -+}; -+ -+static match_table_t options = { -+ {Opt_br, "br=%s"}, -+ {Opt_br, "br:%s"}, -+ -+ {Opt_add, "add=%d:%s"}, -+ {Opt_add, "add:%d:%s"}, -+ {Opt_add, "ins=%d:%s"}, -+ {Opt_add, "ins:%d:%s"}, -+ {Opt_append, "append=%s"}, -+ {Opt_append, "append:%s"}, -+ {Opt_prepend, "prepend=%s"}, -+ {Opt_prepend, "prepend:%s"}, -+ -+ {Opt_del, "del=%s"}, -+ {Opt_del, "del:%s"}, -+ /* {Opt_idel, "idel:%d"}, */ -+ {Opt_mod, "mod=%s"}, -+ {Opt_mod, "mod:%s"}, -+ /* {Opt_imod, "imod:%d:%s"}, */ -+ -+ {Opt_dirwh, "dirwh=%d"}, -+ -+ {Opt_xino, "xino=%s"}, -+ {Opt_noxino, "noxino"}, -+ {Opt_trunc_xino, "trunc_xino"}, -+ {Opt_trunc_xino_v, "trunc_xino_v=%d:%d"}, -+ {Opt_notrunc_xino, "notrunc_xino"}, -+ {Opt_trunc_xino_path, "trunc_xino=%s"}, -+ {Opt_itrunc_xino, "itrunc_xino=%d"}, -+ /* {Opt_zxino, "zxino=%s"}, */ -+ {Opt_trunc_xib, "trunc_xib"}, -+ {Opt_notrunc_xib, "notrunc_xib"}, -+ -+#ifdef CONFIG_PROC_FS -+ {Opt_plink, "plink"}, -+#else -+ {Opt_ignore_silent, "plink"}, -+#endif -+ -+ {Opt_noplink, "noplink"}, -+ -+#ifdef CONFIG_AUFS_DEBUG -+ {Opt_list_plink, "list_plink"}, -+#endif -+ -+ {Opt_udba, "udba=%s"}, -+ -+ {Opt_dio, "dio"}, -+ {Opt_nodio, "nodio"}, -+ -+#ifdef CONFIG_AUFS_DIRREN -+ {Opt_dirren, "dirren"}, -+ {Opt_nodirren, "nodirren"}, -+#else -+ {Opt_ignore, "dirren"}, -+ {Opt_ignore_silent, "nodirren"}, -+#endif -+ -+#ifdef CONFIG_AUFS_FHSM -+ {Opt_fhsm_sec, "fhsm_sec=%d"}, -+#else -+ {Opt_ignore, "fhsm_sec=%d"}, -+#endif -+ -+ {Opt_diropq_a, "diropq=always"}, -+ {Opt_diropq_a, "diropq=a"}, -+ {Opt_diropq_w, "diropq=whiteouted"}, -+ {Opt_diropq_w, "diropq=w"}, -+ -+ {Opt_warn_perm, "warn_perm"}, -+ {Opt_nowarn_perm, "nowarn_perm"}, -+ -+ /* keep them temporary */ -+ {Opt_ignore_silent, "nodlgt"}, -+ {Opt_ignore, "clean_plink"}, -+ -+#ifdef CONFIG_AUFS_SHWH -+ {Opt_shwh, "shwh"}, -+#endif -+ {Opt_noshwh, "noshwh"}, -+ -+ {Opt_dirperm1, "dirperm1"}, -+ {Opt_nodirperm1, "nodirperm1"}, -+ -+ {Opt_verbose, "verbose"}, -+ {Opt_verbose, "v"}, -+ {Opt_noverbose, "noverbose"}, -+ {Opt_noverbose, "quiet"}, -+ {Opt_noverbose, "q"}, -+ {Opt_noverbose, "silent"}, -+ -+ {Opt_sum, "sum"}, -+ {Opt_nosum, "nosum"}, -+ {Opt_wsum, "wsum"}, -+ -+ {Opt_rdcache, "rdcache=%d"}, -+ {Opt_rdblk, "rdblk=%d"}, -+ {Opt_rdblk_def, "rdblk=def"}, -+ {Opt_rdhash, "rdhash=%d"}, -+ {Opt_rdhash_def, "rdhash=def"}, -+ -+ {Opt_wbr_create, "create=%s"}, -+ {Opt_wbr_create, "create_policy=%s"}, -+ {Opt_wbr_copyup, "cpup=%s"}, -+ {Opt_wbr_copyup, "copyup=%s"}, -+ {Opt_wbr_copyup, "copyup_policy=%s"}, -+ -+ /* generic VFS flag */ -+#ifdef CONFIG_FS_POSIX_ACL -+ {Opt_acl, "acl"}, -+ {Opt_noacl, "noacl"}, -+#else -+ {Opt_ignore, "acl"}, -+ {Opt_ignore_silent, "noacl"}, -+#endif -+ -+ /* internal use for the scripts */ -+ {Opt_ignore_silent, "si=%s"}, -+ -+ {Opt_br, "dirs=%s"}, -+ {Opt_ignore, "debug=%d"}, -+ {Opt_ignore, "delete=whiteout"}, -+ {Opt_ignore, "delete=all"}, -+ {Opt_ignore, "imap=%s"}, -+ -+ /* temporary workaround, due to old mount(8)? */ -+ {Opt_ignore_silent, "relatime"}, -+ -+ {Opt_err, NULL} -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+static const char *au_parser_pattern(int val, match_table_t tbl) -+{ -+ struct match_token *p; -+ -+ p = tbl; -+ while (p->pattern) { -+ if (p->token == val) -+ return p->pattern; -+ p++; -+ } -+ BUG(); -+ return "??"; -+} -+ -+static const char *au_optstr(int *val, match_table_t tbl) -+{ -+ struct match_token *p; -+ int v; -+ -+ v = *val; -+ if (!v) -+ goto out; -+ p = tbl; -+ while (p->pattern) { -+ if (p->token -+ && (v & p->token) == p->token) { -+ *val &= ~p->token; -+ return p->pattern; -+ } -+ p++; -+ } -+ -+out: -+ return NULL; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static match_table_t brperm = { -+ {AuBrPerm_RO, AUFS_BRPERM_RO}, -+ {AuBrPerm_RR, AUFS_BRPERM_RR}, -+ {AuBrPerm_RW, AUFS_BRPERM_RW}, -+ {0, NULL} -+}; -+ -+static match_table_t brattr = { -+ /* general */ -+ {AuBrAttr_COO_REG, AUFS_BRATTR_COO_REG}, -+ {AuBrAttr_COO_ALL, AUFS_BRATTR_COO_ALL}, -+ /* 'unpin' attrib is meaningless since linux-3.18-rc1 */ -+ {AuBrAttr_UNPIN, AUFS_BRATTR_UNPIN}, -+#ifdef CONFIG_AUFS_FHSM -+ {AuBrAttr_FHSM, AUFS_BRATTR_FHSM}, -+#endif -+#ifdef CONFIG_AUFS_XATTR -+ {AuBrAttr_ICEX, AUFS_BRATTR_ICEX}, -+ {AuBrAttr_ICEX_SEC, AUFS_BRATTR_ICEX_SEC}, -+ {AuBrAttr_ICEX_SYS, AUFS_BRATTR_ICEX_SYS}, -+ {AuBrAttr_ICEX_TR, AUFS_BRATTR_ICEX_TR}, -+ {AuBrAttr_ICEX_USR, AUFS_BRATTR_ICEX_USR}, -+ {AuBrAttr_ICEX_OTH, AUFS_BRATTR_ICEX_OTH}, -+#endif -+ -+ /* ro/rr branch */ -+ {AuBrRAttr_WH, AUFS_BRRATTR_WH}, -+ -+ /* rw branch */ -+ {AuBrWAttr_MOO, AUFS_BRWATTR_MOO}, -+ {AuBrWAttr_NoLinkWH, AUFS_BRWATTR_NLWH}, -+ -+ {0, NULL} -+}; -+ -+static int br_attr_val(char *str, match_table_t table, substring_t args[]) -+{ -+ int attr, v; -+ char *p; -+ -+ attr = 0; -+ do { -+ p = strchr(str, '+'); -+ if (p) -+ *p = 0; -+ v = match_token(str, table, args); -+ if (v) { -+ if (v & AuBrAttr_CMOO_Mask) -+ attr &= ~AuBrAttr_CMOO_Mask; -+ attr |= v; -+ } else { -+ if (p) -+ *p = '+'; -+ pr_warn("ignored branch attribute %s\n", str); -+ break; -+ } -+ if (p) -+ str = p + 1; -+ } while (p); -+ -+ return attr; -+} -+ -+static int au_do_optstr_br_attr(au_br_perm_str_t *str, int perm) -+{ -+ int sz; -+ const char *p; -+ char *q; -+ -+ q = str->a; -+ *q = 0; -+ p = au_optstr(&perm, brattr); -+ if (p) { -+ sz = strlen(p); -+ memcpy(q, p, sz + 1); -+ q += sz; -+ } else -+ goto out; -+ -+ do { -+ p = au_optstr(&perm, brattr); -+ if (p) { -+ *q++ = '+'; -+ sz = strlen(p); -+ memcpy(q, p, sz + 1); -+ q += sz; -+ } -+ } while (p); -+ -+out: -+ return q - str->a; -+} -+ -+static int noinline_for_stack br_perm_val(char *perm) -+{ -+ int val, bad, sz; -+ char *p; -+ substring_t args[MAX_OPT_ARGS]; -+ au_br_perm_str_t attr; -+ -+ p = strchr(perm, '+'); -+ if (p) -+ *p = 0; -+ val = match_token(perm, brperm, args); -+ if (!val) { -+ if (p) -+ *p = '+'; -+ pr_warn("ignored branch permission %s\n", perm); -+ val = AuBrPerm_RO; -+ goto out; -+ } -+ if (!p) -+ goto out; -+ -+ val |= br_attr_val(p + 1, brattr, args); -+ -+ bad = 0; -+ switch (val & AuBrPerm_Mask) { -+ case AuBrPerm_RO: -+ case AuBrPerm_RR: -+ bad = val & AuBrWAttr_Mask; -+ val &= ~AuBrWAttr_Mask; -+ break; -+ case AuBrPerm_RW: -+ bad = val & AuBrRAttr_Mask; -+ val &= ~AuBrRAttr_Mask; -+ break; -+ } -+ -+ /* -+ * 'unpin' attrib becomes meaningless since linux-3.18-rc1, but aufs -+ * does not treat it as an error, just warning. -+ * this is a tiny guard for the user operation. -+ */ -+ if (val & AuBrAttr_UNPIN) { -+ bad |= AuBrAttr_UNPIN; -+ val &= ~AuBrAttr_UNPIN; -+ } -+ -+ if (unlikely(bad)) { -+ sz = au_do_optstr_br_attr(&attr, bad); -+ AuDebugOn(!sz); -+ pr_warn("ignored branch attribute %s\n", attr.a); -+ } -+ -+out: -+ return val; -+} -+ -+void au_optstr_br_perm(au_br_perm_str_t *str, int perm) -+{ -+ au_br_perm_str_t attr; -+ const char *p; -+ char *q; -+ int sz; -+ -+ q = str->a; -+ p = au_optstr(&perm, brperm); -+ AuDebugOn(!p || !*p); -+ sz = strlen(p); -+ memcpy(q, p, sz + 1); -+ q += sz; -+ -+ sz = au_do_optstr_br_attr(&attr, perm); -+ if (sz) { -+ *q++ = '+'; -+ memcpy(q, attr.a, sz + 1); -+ } -+ -+ AuDebugOn(strlen(str->a) >= sizeof(str->a)); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static match_table_t udbalevel = { -+ {AuOpt_UDBA_REVAL, "reval"}, -+ {AuOpt_UDBA_NONE, "none"}, -+#ifdef CONFIG_AUFS_HNOTIFY -+ {AuOpt_UDBA_HNOTIFY, "notify"}, /* abstraction */ -+#ifdef CONFIG_AUFS_HFSNOTIFY -+ {AuOpt_UDBA_HNOTIFY, "fsnotify"}, -+#endif -+#endif -+ {-1, NULL} -+}; -+ -+static int noinline_for_stack udba_val(char *str) -+{ -+ substring_t args[MAX_OPT_ARGS]; -+ -+ return match_token(str, udbalevel, args); -+} -+ -+const char *au_optstr_udba(int udba) -+{ -+ return au_parser_pattern(udba, udbalevel); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static match_table_t au_wbr_create_policy = { -+ {AuWbrCreate_TDP, "tdp"}, -+ {AuWbrCreate_TDP, "top-down-parent"}, -+ {AuWbrCreate_RR, "rr"}, -+ {AuWbrCreate_RR, "round-robin"}, -+ {AuWbrCreate_MFS, "mfs"}, -+ {AuWbrCreate_MFS, "most-free-space"}, -+ {AuWbrCreate_MFSV, "mfs:%d"}, -+ {AuWbrCreate_MFSV, "most-free-space:%d"}, -+ -+ /* top-down regardless the parent, and then mfs */ -+ {AuWbrCreate_TDMFS, "tdmfs:%d"}, -+ {AuWbrCreate_TDMFSV, "tdmfs:%d:%d"}, -+ -+ {AuWbrCreate_MFSRR, "mfsrr:%d"}, -+ {AuWbrCreate_MFSRRV, "mfsrr:%d:%d"}, -+ {AuWbrCreate_PMFS, "pmfs"}, -+ {AuWbrCreate_PMFSV, "pmfs:%d"}, -+ {AuWbrCreate_PMFSRR, "pmfsrr:%d"}, -+ {AuWbrCreate_PMFSRRV, "pmfsrr:%d:%d"}, -+ -+ {-1, NULL} -+}; -+ -+static int au_wbr_mfs_wmark(substring_t *arg, char *str, -+ struct au_opt_wbr_create *create) -+{ -+ int err; -+ unsigned long long ull; -+ -+ err = 0; -+ if (!match_u64(arg, &ull)) -+ create->mfsrr_watermark = ull; -+ else { -+ pr_err("bad integer in %s\n", str); -+ err = -EINVAL; -+ } -+ -+ return err; -+} -+ -+static int au_wbr_mfs_sec(substring_t *arg, char *str, -+ struct au_opt_wbr_create *create) -+{ -+ int n, err; -+ -+ err = 0; -+ if (!match_int(arg, &n) && 0 <= n && n <= AUFS_MFS_MAX_SEC) -+ create->mfs_second = n; -+ else { -+ pr_err("bad integer in %s\n", str); -+ err = -EINVAL; -+ } -+ -+ return err; -+} -+ -+static int noinline_for_stack -+au_wbr_create_val(char *str, struct au_opt_wbr_create *create) -+{ -+ int err, e; -+ substring_t args[MAX_OPT_ARGS]; -+ -+ err = match_token(str, au_wbr_create_policy, args); -+ create->wbr_create = err; -+ switch (err) { -+ case AuWbrCreate_MFSRRV: -+ case AuWbrCreate_TDMFSV: -+ case AuWbrCreate_PMFSRRV: -+ e = au_wbr_mfs_wmark(&args[0], str, create); -+ if (!e) -+ e = au_wbr_mfs_sec(&args[1], str, create); -+ if (unlikely(e)) -+ err = e; -+ break; -+ case AuWbrCreate_MFSRR: -+ case AuWbrCreate_TDMFS: -+ case AuWbrCreate_PMFSRR: -+ e = au_wbr_mfs_wmark(&args[0], str, create); -+ if (unlikely(e)) { -+ err = e; -+ break; -+ } -+ /*FALLTHROUGH*/ -+ case AuWbrCreate_MFS: -+ case AuWbrCreate_PMFS: -+ create->mfs_second = AUFS_MFS_DEF_SEC; -+ break; -+ case AuWbrCreate_MFSV: -+ case AuWbrCreate_PMFSV: -+ e = au_wbr_mfs_sec(&args[0], str, create); -+ if (unlikely(e)) -+ err = e; -+ break; -+ } -+ -+ return err; -+} -+ -+const char *au_optstr_wbr_create(int wbr_create) -+{ -+ return au_parser_pattern(wbr_create, au_wbr_create_policy); -+} -+ -+static match_table_t au_wbr_copyup_policy = { -+ {AuWbrCopyup_TDP, "tdp"}, -+ {AuWbrCopyup_TDP, "top-down-parent"}, -+ {AuWbrCopyup_BUP, "bup"}, -+ {AuWbrCopyup_BUP, "bottom-up-parent"}, -+ {AuWbrCopyup_BU, "bu"}, -+ {AuWbrCopyup_BU, "bottom-up"}, -+ {-1, NULL} -+}; -+ -+static int noinline_for_stack au_wbr_copyup_val(char *str) -+{ -+ substring_t args[MAX_OPT_ARGS]; -+ -+ return match_token(str, au_wbr_copyup_policy, args); -+} -+ -+const char *au_optstr_wbr_copyup(int wbr_copyup) -+{ -+ return au_parser_pattern(wbr_copyup, au_wbr_copyup_policy); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY; -+ -+static void dump_opts(struct au_opts *opts) -+{ -+#ifdef CONFIG_AUFS_DEBUG -+ /* reduce stack space */ -+ union { -+ struct au_opt_add *add; -+ struct au_opt_del *del; -+ struct au_opt_mod *mod; -+ struct au_opt_xino *xino; -+ struct au_opt_xino_itrunc *xino_itrunc; -+ struct au_opt_wbr_create *create; -+ } u; -+ struct au_opt *opt; -+ -+ opt = opts->opt; -+ while (opt->type != Opt_tail) { -+ switch (opt->type) { -+ case Opt_add: -+ u.add = &opt->add; -+ AuDbg("add {b%d, %s, 0x%x, %p}\n", -+ u.add->bindex, u.add->pathname, u.add->perm, -+ u.add->path.dentry); -+ break; -+ case Opt_del: -+ case Opt_idel: -+ u.del = &opt->del; -+ AuDbg("del {%s, %p}\n", -+ u.del->pathname, u.del->h_path.dentry); -+ break; -+ case Opt_mod: -+ case Opt_imod: -+ u.mod = &opt->mod; -+ AuDbg("mod {%s, 0x%x, %p}\n", -+ u.mod->path, u.mod->perm, u.mod->h_root); -+ break; -+ case Opt_append: -+ u.add = &opt->add; -+ AuDbg("append {b%d, %s, 0x%x, %p}\n", -+ u.add->bindex, u.add->pathname, u.add->perm, -+ u.add->path.dentry); -+ break; -+ case Opt_prepend: -+ u.add = &opt->add; -+ AuDbg("prepend {b%d, %s, 0x%x, %p}\n", -+ u.add->bindex, u.add->pathname, u.add->perm, -+ u.add->path.dentry); -+ break; -+ case Opt_dirwh: -+ AuDbg("dirwh %d\n", opt->dirwh); -+ break; -+ case Opt_rdcache: -+ AuDbg("rdcache %d\n", opt->rdcache); -+ break; -+ case Opt_rdblk: -+ AuDbg("rdblk %u\n", opt->rdblk); -+ break; -+ case Opt_rdblk_def: -+ AuDbg("rdblk_def\n"); -+ break; -+ case Opt_rdhash: -+ AuDbg("rdhash %u\n", opt->rdhash); -+ break; -+ case Opt_rdhash_def: -+ AuDbg("rdhash_def\n"); -+ break; -+ case Opt_xino: -+ u.xino = &opt->xino; -+ AuDbg("xino {%s %pD}\n", u.xino->path, u.xino->file); -+ break; -+ case Opt_trunc_xino: -+ AuLabel(trunc_xino); -+ break; -+ case Opt_notrunc_xino: -+ AuLabel(notrunc_xino); -+ break; -+ case Opt_trunc_xino_path: -+ case Opt_itrunc_xino: -+ u.xino_itrunc = &opt->xino_itrunc; -+ AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex); -+ break; -+ case Opt_noxino: -+ AuLabel(noxino); -+ break; -+ case Opt_trunc_xib: -+ AuLabel(trunc_xib); -+ break; -+ case Opt_notrunc_xib: -+ AuLabel(notrunc_xib); -+ break; -+ case Opt_shwh: -+ AuLabel(shwh); -+ break; -+ case Opt_noshwh: -+ AuLabel(noshwh); -+ break; -+ case Opt_dirperm1: -+ AuLabel(dirperm1); -+ break; -+ case Opt_nodirperm1: -+ AuLabel(nodirperm1); -+ break; -+ case Opt_plink: -+ AuLabel(plink); -+ break; -+ case Opt_noplink: -+ AuLabel(noplink); -+ break; -+ case Opt_list_plink: -+ AuLabel(list_plink); -+ break; -+ case Opt_udba: -+ AuDbg("udba %d, %s\n", -+ opt->udba, au_optstr_udba(opt->udba)); -+ break; -+ case Opt_dio: -+ AuLabel(dio); -+ break; -+ case Opt_nodio: -+ AuLabel(nodio); -+ break; -+ case Opt_diropq_a: -+ AuLabel(diropq_a); -+ break; -+ case Opt_diropq_w: -+ AuLabel(diropq_w); -+ break; -+ case Opt_warn_perm: -+ AuLabel(warn_perm); -+ break; -+ case Opt_nowarn_perm: -+ AuLabel(nowarn_perm); -+ break; -+ case Opt_verbose: -+ AuLabel(verbose); -+ break; -+ case Opt_noverbose: -+ AuLabel(noverbose); -+ break; -+ case Opt_sum: -+ AuLabel(sum); -+ break; -+ case Opt_nosum: -+ AuLabel(nosum); -+ break; -+ case Opt_wsum: -+ AuLabel(wsum); -+ break; -+ case Opt_wbr_create: -+ u.create = &opt->wbr_create; -+ AuDbg("create %d, %s\n", u.create->wbr_create, -+ au_optstr_wbr_create(u.create->wbr_create)); -+ switch (u.create->wbr_create) { -+ case AuWbrCreate_MFSV: -+ case AuWbrCreate_PMFSV: -+ AuDbg("%d sec\n", u.create->mfs_second); -+ break; -+ case AuWbrCreate_MFSRR: -+ case AuWbrCreate_TDMFS: -+ AuDbg("%llu watermark\n", -+ u.create->mfsrr_watermark); -+ break; -+ case AuWbrCreate_MFSRRV: -+ case AuWbrCreate_TDMFSV: -+ case AuWbrCreate_PMFSRRV: -+ AuDbg("%llu watermark, %d sec\n", -+ u.create->mfsrr_watermark, -+ u.create->mfs_second); -+ break; -+ } -+ break; -+ case Opt_wbr_copyup: -+ AuDbg("copyup %d, %s\n", opt->wbr_copyup, -+ au_optstr_wbr_copyup(opt->wbr_copyup)); -+ break; -+ case Opt_fhsm_sec: -+ AuDbg("fhsm_sec %u\n", opt->fhsm_second); -+ break; -+ case Opt_dirren: -+ AuLabel(dirren); -+ break; -+ case Opt_nodirren: -+ AuLabel(nodirren); -+ break; -+ case Opt_acl: -+ AuLabel(acl); -+ break; -+ case Opt_noacl: -+ AuLabel(noacl); -+ break; -+ default: -+ BUG(); -+ } -+ opt++; -+ } -+#endif -+} -+ -+void au_opts_free(struct au_opts *opts) -+{ -+ struct au_opt *opt; -+ -+ opt = opts->opt; -+ while (opt->type != Opt_tail) { -+ switch (opt->type) { -+ case Opt_add: -+ case Opt_append: -+ case Opt_prepend: -+ path_put(&opt->add.path); -+ break; -+ case Opt_del: -+ case Opt_idel: -+ path_put(&opt->del.h_path); -+ break; -+ case Opt_mod: -+ case Opt_imod: -+ dput(opt->mod.h_root); -+ break; -+ case Opt_xino: -+ fput(opt->xino.file); -+ break; -+ } -+ opt++; -+ } -+} -+ -+static int opt_add(struct au_opt *opt, char *opt_str, unsigned long sb_flags, -+ aufs_bindex_t bindex) -+{ -+ int err; -+ struct au_opt_add *add = &opt->add; -+ char *p; -+ -+ add->bindex = bindex; -+ add->perm = AuBrPerm_RO; -+ add->pathname = opt_str; -+ p = strchr(opt_str, '='); -+ if (p) { -+ *p++ = 0; -+ if (*p) -+ add->perm = br_perm_val(p); -+ } -+ -+ err = vfsub_kern_path(add->pathname, lkup_dirflags, &add->path); -+ if (!err) { -+ if (!p) { -+ add->perm = AuBrPerm_RO; -+ if (au_test_fs_rr(add->path.dentry->d_sb)) -+ add->perm = AuBrPerm_RR; -+ else if (!bindex && !(sb_flags & SB_RDONLY)) -+ add->perm = AuBrPerm_RW; -+ } -+ opt->type = Opt_add; -+ goto out; -+ } -+ pr_err("lookup failed %s (%d)\n", add->pathname, err); -+ err = -EINVAL; -+ -+out: -+ return err; -+} -+ -+static int au_opts_parse_del(struct au_opt_del *del, substring_t args[]) -+{ -+ int err; -+ -+ del->pathname = args[0].from; -+ AuDbg("del path %s\n", del->pathname); -+ -+ err = vfsub_kern_path(del->pathname, lkup_dirflags, &del->h_path); -+ if (unlikely(err)) -+ pr_err("lookup failed %s (%d)\n", del->pathname, err); -+ -+ return err; -+} -+ -+#if 0 /* reserved for future use */ -+static int au_opts_parse_idel(struct super_block *sb, aufs_bindex_t bindex, -+ struct au_opt_del *del, substring_t args[]) -+{ -+ int err; -+ struct dentry *root; -+ -+ err = -EINVAL; -+ root = sb->s_root; -+ aufs_read_lock(root, AuLock_FLUSH); -+ if (bindex < 0 || au_sbbot(sb) < bindex) { -+ pr_err("out of bounds, %d\n", bindex); -+ goto out; -+ } -+ -+ err = 0; -+ del->h_path.dentry = dget(au_h_dptr(root, bindex)); -+ del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex)); -+ -+out: -+ aufs_read_unlock(root, !AuLock_IR); -+ return err; -+} -+#endif -+ -+static int noinline_for_stack -+au_opts_parse_mod(struct au_opt_mod *mod, substring_t args[]) -+{ -+ int err; -+ struct path path; -+ char *p; -+ -+ err = -EINVAL; -+ mod->path = args[0].from; -+ p = strchr(mod->path, '='); -+ if (unlikely(!p)) { -+ pr_err("no permission %s\n", args[0].from); -+ goto out; -+ } -+ -+ *p++ = 0; -+ err = vfsub_kern_path(mod->path, lkup_dirflags, &path); -+ if (unlikely(err)) { -+ pr_err("lookup failed %s (%d)\n", mod->path, err); -+ goto out; -+ } -+ -+ mod->perm = br_perm_val(p); -+ AuDbg("mod path %s, perm 0x%x, %s\n", mod->path, mod->perm, p); -+ mod->h_root = dget(path.dentry); -+ path_put(&path); -+ -+out: -+ return err; -+} -+ -+#if 0 /* reserved for future use */ -+static int au_opts_parse_imod(struct super_block *sb, aufs_bindex_t bindex, -+ struct au_opt_mod *mod, substring_t args[]) -+{ -+ int err; -+ struct dentry *root; -+ -+ err = -EINVAL; -+ root = sb->s_root; -+ aufs_read_lock(root, AuLock_FLUSH); -+ if (bindex < 0 || au_sbbot(sb) < bindex) { -+ pr_err("out of bounds, %d\n", bindex); -+ goto out; -+ } -+ -+ err = 0; -+ mod->perm = br_perm_val(args[1].from); -+ AuDbg("mod path %s, perm 0x%x, %s\n", -+ mod->path, mod->perm, args[1].from); -+ mod->h_root = dget(au_h_dptr(root, bindex)); -+ -+out: -+ aufs_read_unlock(root, !AuLock_IR); -+ return err; -+} -+#endif -+ -+static int au_opts_parse_xino(struct super_block *sb, struct au_opt_xino *xino, -+ substring_t args[]) -+{ -+ int err; -+ struct file *file; -+ -+ file = au_xino_create(sb, args[0].from, /*silent*/0, /*wbrtop*/0); -+ err = PTR_ERR(file); -+ if (IS_ERR(file)) -+ goto out; -+ -+ err = -EINVAL; -+ if (unlikely(file->f_path.dentry->d_sb == sb)) { -+ fput(file); -+ pr_err("%s must be outside\n", args[0].from); -+ goto out; -+ } -+ -+ err = 0; -+ xino->file = file; -+ xino->path = args[0].from; -+ -+out: -+ return err; -+} -+ -+static int noinline_for_stack -+au_opts_parse_xino_itrunc_path(struct super_block *sb, -+ struct au_opt_xino_itrunc *xino_itrunc, -+ substring_t args[]) -+{ -+ int err; -+ aufs_bindex_t bbot, bindex; -+ struct path path; -+ struct dentry *root; -+ -+ err = vfsub_kern_path(args[0].from, lkup_dirflags, &path); -+ if (unlikely(err)) { -+ pr_err("lookup failed %s (%d)\n", args[0].from, err); -+ goto out; -+ } -+ -+ xino_itrunc->bindex = -1; -+ root = sb->s_root; -+ aufs_read_lock(root, AuLock_FLUSH); -+ bbot = au_sbbot(sb); -+ for (bindex = 0; bindex <= bbot; bindex++) { -+ if (au_h_dptr(root, bindex) == path.dentry) { -+ xino_itrunc->bindex = bindex; -+ break; -+ } -+ } -+ aufs_read_unlock(root, !AuLock_IR); -+ path_put(&path); -+ -+ if (unlikely(xino_itrunc->bindex < 0)) { -+ pr_err("no such branch %s\n", args[0].from); -+ err = -EINVAL; -+ } -+ -+out: -+ return err; -+} -+ -+/* called without aufs lock */ -+int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts) -+{ -+ int err, n, token; -+ aufs_bindex_t bindex; -+ unsigned char skipped; -+ struct dentry *root; -+ struct au_opt *opt, *opt_tail; -+ char *opt_str; -+ /* reduce the stack space */ -+ union { -+ struct au_opt_xino_itrunc *xino_itrunc; -+ struct au_opt_wbr_create *create; -+ } u; -+ struct { -+ substring_t args[MAX_OPT_ARGS]; -+ } *a; -+ -+ err = -ENOMEM; -+ a = kmalloc(sizeof(*a), GFP_NOFS); -+ if (unlikely(!a)) -+ goto out; -+ -+ root = sb->s_root; -+ err = 0; -+ bindex = 0; -+ opt = opts->opt; -+ opt_tail = opt + opts->max_opt - 1; -+ opt->type = Opt_tail; -+ while (!err && (opt_str = strsep(&str, ",")) && *opt_str) { -+ err = -EINVAL; -+ skipped = 0; -+ token = match_token(opt_str, options, a->args); -+ switch (token) { -+ case Opt_br: -+ err = 0; -+ while (!err && (opt_str = strsep(&a->args[0].from, ":")) -+ && *opt_str) { -+ err = opt_add(opt, opt_str, opts->sb_flags, -+ bindex++); -+ if (unlikely(!err && ++opt > opt_tail)) { -+ err = -E2BIG; -+ break; -+ } -+ opt->type = Opt_tail; -+ skipped = 1; -+ } -+ break; -+ case Opt_add: -+ if (unlikely(match_int(&a->args[0], &n))) { -+ pr_err("bad integer in %s\n", opt_str); -+ break; -+ } -+ bindex = n; -+ err = opt_add(opt, a->args[1].from, opts->sb_flags, -+ bindex); -+ if (!err) -+ opt->type = token; -+ break; -+ case Opt_append: -+ err = opt_add(opt, a->args[0].from, opts->sb_flags, -+ /*dummy bindex*/1); -+ if (!err) -+ opt->type = token; -+ break; -+ case Opt_prepend: -+ err = opt_add(opt, a->args[0].from, opts->sb_flags, -+ /*bindex*/0); -+ if (!err) -+ opt->type = token; -+ break; -+ case Opt_del: -+ err = au_opts_parse_del(&opt->del, a->args); -+ if (!err) -+ opt->type = token; -+ break; -+#if 0 /* reserved for future use */ -+ case Opt_idel: -+ del->pathname = "(indexed)"; -+ if (unlikely(match_int(&args[0], &n))) { -+ pr_err("bad integer in %s\n", opt_str); -+ break; -+ } -+ err = au_opts_parse_idel(sb, n, &opt->del, a->args); -+ if (!err) -+ opt->type = token; -+ break; -+#endif -+ case Opt_mod: -+ err = au_opts_parse_mod(&opt->mod, a->args); -+ if (!err) -+ opt->type = token; -+ break; -+#ifdef IMOD /* reserved for future use */ -+ case Opt_imod: -+ u.mod->path = "(indexed)"; -+ if (unlikely(match_int(&a->args[0], &n))) { -+ pr_err("bad integer in %s\n", opt_str); -+ break; -+ } -+ err = au_opts_parse_imod(sb, n, &opt->mod, a->args); -+ if (!err) -+ opt->type = token; -+ break; -+#endif -+ case Opt_xino: -+ err = au_opts_parse_xino(sb, &opt->xino, a->args); -+ if (!err) -+ opt->type = token; -+ break; -+ -+ case Opt_trunc_xino_path: -+ err = au_opts_parse_xino_itrunc_path -+ (sb, &opt->xino_itrunc, a->args); -+ if (!err) -+ opt->type = token; -+ break; -+ -+ case Opt_itrunc_xino: -+ u.xino_itrunc = &opt->xino_itrunc; -+ if (unlikely(match_int(&a->args[0], &n))) { -+ pr_err("bad integer in %s\n", opt_str); -+ break; -+ } -+ u.xino_itrunc->bindex = n; -+ aufs_read_lock(root, AuLock_FLUSH); -+ if (n < 0 || au_sbbot(sb) < n) { -+ pr_err("out of bounds, %d\n", n); -+ aufs_read_unlock(root, !AuLock_IR); -+ break; -+ } -+ aufs_read_unlock(root, !AuLock_IR); -+ err = 0; -+ opt->type = token; -+ break; -+ -+ case Opt_dirwh: -+ if (unlikely(match_int(&a->args[0], &opt->dirwh))) -+ break; -+ err = 0; -+ opt->type = token; -+ break; -+ -+ case Opt_rdcache: -+ if (unlikely(match_int(&a->args[0], &n))) { -+ pr_err("bad integer in %s\n", opt_str); -+ break; -+ } -+ if (unlikely(n > AUFS_RDCACHE_MAX)) { -+ pr_err("rdcache must be smaller than %d\n", -+ AUFS_RDCACHE_MAX); -+ break; -+ } -+ opt->rdcache = n; -+ err = 0; -+ opt->type = token; -+ break; -+ case Opt_rdblk: -+ if (unlikely(match_int(&a->args[0], &n) -+ || n < 0 -+ || n > KMALLOC_MAX_SIZE)) { -+ pr_err("bad integer in %s\n", opt_str); -+ break; -+ } -+ if (unlikely(n && n < NAME_MAX)) { -+ pr_err("rdblk must be larger than %d\n", -+ NAME_MAX); -+ break; -+ } -+ opt->rdblk = n; -+ err = 0; -+ opt->type = token; -+ break; -+ case Opt_rdhash: -+ if (unlikely(match_int(&a->args[0], &n) -+ || n < 0 -+ || n * sizeof(struct hlist_head) -+ > KMALLOC_MAX_SIZE)) { -+ pr_err("bad integer in %s\n", opt_str); -+ break; -+ } -+ opt->rdhash = n; -+ err = 0; -+ opt->type = token; -+ break; -+ -+ case Opt_trunc_xino: -+ case Opt_notrunc_xino: -+ case Opt_noxino: -+ case Opt_trunc_xib: -+ case Opt_notrunc_xib: -+ case Opt_shwh: -+ case Opt_noshwh: -+ case Opt_dirperm1: -+ case Opt_nodirperm1: -+ case Opt_plink: -+ case Opt_noplink: -+ case Opt_list_plink: -+ case Opt_dio: -+ case Opt_nodio: -+ case Opt_diropq_a: -+ case Opt_diropq_w: -+ case Opt_warn_perm: -+ case Opt_nowarn_perm: -+ case Opt_verbose: -+ case Opt_noverbose: -+ case Opt_sum: -+ case Opt_nosum: -+ case Opt_wsum: -+ case Opt_rdblk_def: -+ case Opt_rdhash_def: -+ case Opt_dirren: -+ case Opt_nodirren: -+ case Opt_acl: -+ case Opt_noacl: -+ err = 0; -+ opt->type = token; -+ break; -+ -+ case Opt_udba: -+ opt->udba = udba_val(a->args[0].from); -+ if (opt->udba >= 0) { -+ err = 0; -+ opt->type = token; -+ } else -+ pr_err("wrong value, %s\n", opt_str); -+ break; -+ -+ case Opt_wbr_create: -+ u.create = &opt->wbr_create; -+ u.create->wbr_create -+ = au_wbr_create_val(a->args[0].from, u.create); -+ if (u.create->wbr_create >= 0) { -+ err = 0; -+ opt->type = token; -+ } else -+ pr_err("wrong value, %s\n", opt_str); -+ break; -+ case Opt_wbr_copyup: -+ opt->wbr_copyup = au_wbr_copyup_val(a->args[0].from); -+ if (opt->wbr_copyup >= 0) { -+ err = 0; -+ opt->type = token; -+ } else -+ pr_err("wrong value, %s\n", opt_str); -+ break; -+ -+ case Opt_fhsm_sec: -+ if (unlikely(match_int(&a->args[0], &n) -+ || n < 0)) { -+ pr_err("bad integer in %s\n", opt_str); -+ break; -+ } -+ if (sysaufs_brs) { -+ opt->fhsm_second = n; -+ opt->type = token; -+ } else -+ pr_warn("ignored %s\n", opt_str); -+ err = 0; -+ break; -+ -+ case Opt_ignore: -+ pr_warn("ignored %s\n", opt_str); -+ /*FALLTHROUGH*/ -+ case Opt_ignore_silent: -+ skipped = 1; -+ err = 0; -+ break; -+ case Opt_err: -+ pr_err("unknown option %s\n", opt_str); -+ break; -+ } -+ -+ if (!err && !skipped) { -+ if (unlikely(++opt > opt_tail)) { -+ err = -E2BIG; -+ opt--; -+ opt->type = Opt_tail; -+ break; -+ } -+ opt->type = Opt_tail; -+ } -+ } -+ -+ au_kfree_rcu(a); -+ dump_opts(opts); -+ if (unlikely(err)) -+ au_opts_free(opts); -+ -+out: -+ return err; -+} -+ -+static int au_opt_wbr_create(struct super_block *sb, -+ struct au_opt_wbr_create *create) -+{ -+ int err; -+ struct au_sbinfo *sbinfo; -+ -+ SiMustWriteLock(sb); -+ -+ err = 1; /* handled */ -+ sbinfo = au_sbi(sb); -+ if (sbinfo->si_wbr_create_ops->fin) { -+ err = sbinfo->si_wbr_create_ops->fin(sb); -+ if (!err) -+ err = 1; -+ } -+ -+ sbinfo->si_wbr_create = create->wbr_create; -+ sbinfo->si_wbr_create_ops = au_wbr_create_ops + create->wbr_create; -+ switch (create->wbr_create) { -+ case AuWbrCreate_MFSRRV: -+ case AuWbrCreate_MFSRR: -+ case AuWbrCreate_TDMFS: -+ case AuWbrCreate_TDMFSV: -+ case AuWbrCreate_PMFSRR: -+ case AuWbrCreate_PMFSRRV: -+ sbinfo->si_wbr_mfs.mfsrr_watermark = create->mfsrr_watermark; -+ /*FALLTHROUGH*/ -+ case AuWbrCreate_MFS: -+ case AuWbrCreate_MFSV: -+ case AuWbrCreate_PMFS: -+ case AuWbrCreate_PMFSV: -+ sbinfo->si_wbr_mfs.mfs_expire -+ = msecs_to_jiffies(create->mfs_second * MSEC_PER_SEC); -+ break; -+ } -+ -+ if (sbinfo->si_wbr_create_ops->init) -+ sbinfo->si_wbr_create_ops->init(sb); /* ignore */ -+ -+ return err; -+} -+ -+/* -+ * returns, -+ * plus: processed without an error -+ * zero: unprocessed -+ */ -+static int au_opt_simple(struct super_block *sb, struct au_opt *opt, -+ struct au_opts *opts) -+{ -+ int err; -+ struct au_sbinfo *sbinfo; -+ -+ SiMustWriteLock(sb); -+ -+ err = 1; /* handled */ -+ sbinfo = au_sbi(sb); -+ switch (opt->type) { -+ case Opt_udba: -+ sbinfo->si_mntflags &= ~AuOptMask_UDBA; -+ sbinfo->si_mntflags |= opt->udba; -+ opts->given_udba |= opt->udba; -+ break; -+ -+ case Opt_plink: -+ au_opt_set(sbinfo->si_mntflags, PLINK); -+ break; -+ case Opt_noplink: -+ if (au_opt_test(sbinfo->si_mntflags, PLINK)) -+ au_plink_put(sb, /*verbose*/1); -+ au_opt_clr(sbinfo->si_mntflags, PLINK); -+ break; -+ case Opt_list_plink: -+ if (au_opt_test(sbinfo->si_mntflags, PLINK)) -+ au_plink_list(sb); -+ break; -+ -+ case Opt_dio: -+ au_opt_set(sbinfo->si_mntflags, DIO); -+ au_fset_opts(opts->flags, REFRESH_DYAOP); -+ break; -+ case Opt_nodio: -+ au_opt_clr(sbinfo->si_mntflags, DIO); -+ au_fset_opts(opts->flags, REFRESH_DYAOP); -+ break; -+ -+ case Opt_fhsm_sec: -+ au_fhsm_set(sbinfo, opt->fhsm_second); -+ break; -+ -+ case Opt_diropq_a: -+ au_opt_set(sbinfo->si_mntflags, ALWAYS_DIROPQ); -+ break; -+ case Opt_diropq_w: -+ au_opt_clr(sbinfo->si_mntflags, ALWAYS_DIROPQ); -+ break; -+ -+ case Opt_warn_perm: -+ au_opt_set(sbinfo->si_mntflags, WARN_PERM); -+ break; -+ case Opt_nowarn_perm: -+ au_opt_clr(sbinfo->si_mntflags, WARN_PERM); -+ break; -+ -+ case Opt_verbose: -+ au_opt_set(sbinfo->si_mntflags, VERBOSE); -+ break; -+ case Opt_noverbose: -+ au_opt_clr(sbinfo->si_mntflags, VERBOSE); -+ break; -+ -+ case Opt_sum: -+ au_opt_set(sbinfo->si_mntflags, SUM); -+ break; -+ case Opt_wsum: -+ au_opt_clr(sbinfo->si_mntflags, SUM); -+ au_opt_set(sbinfo->si_mntflags, SUM_W); -+ case Opt_nosum: -+ au_opt_clr(sbinfo->si_mntflags, SUM); -+ au_opt_clr(sbinfo->si_mntflags, SUM_W); -+ break; -+ -+ case Opt_wbr_create: -+ err = au_opt_wbr_create(sb, &opt->wbr_create); -+ break; -+ case Opt_wbr_copyup: -+ sbinfo->si_wbr_copyup = opt->wbr_copyup; -+ sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + opt->wbr_copyup; -+ break; -+ -+ case Opt_dirwh: -+ sbinfo->si_dirwh = opt->dirwh; -+ break; -+ -+ case Opt_rdcache: -+ sbinfo->si_rdcache -+ = msecs_to_jiffies(opt->rdcache * MSEC_PER_SEC); -+ break; -+ case Opt_rdblk: -+ sbinfo->si_rdblk = opt->rdblk; -+ break; -+ case Opt_rdblk_def: -+ sbinfo->si_rdblk = AUFS_RDBLK_DEF; -+ break; -+ case Opt_rdhash: -+ sbinfo->si_rdhash = opt->rdhash; -+ break; -+ case Opt_rdhash_def: -+ sbinfo->si_rdhash = AUFS_RDHASH_DEF; -+ break; -+ -+ case Opt_shwh: -+ au_opt_set(sbinfo->si_mntflags, SHWH); -+ break; -+ case Opt_noshwh: -+ au_opt_clr(sbinfo->si_mntflags, SHWH); -+ break; -+ -+ case Opt_dirperm1: -+ au_opt_set(sbinfo->si_mntflags, DIRPERM1); -+ break; -+ case Opt_nodirperm1: -+ au_opt_clr(sbinfo->si_mntflags, DIRPERM1); -+ break; -+ -+ case Opt_trunc_xino: -+ au_opt_set(sbinfo->si_mntflags, TRUNC_XINO); -+ break; -+ case Opt_notrunc_xino: -+ au_opt_clr(sbinfo->si_mntflags, TRUNC_XINO); -+ break; -+ -+ case Opt_trunc_xino_path: -+ case Opt_itrunc_xino: -+ err = au_xino_trunc(sb, opt->xino_itrunc.bindex, -+ /*idx_begin*/0); -+ if (!err) -+ err = 1; -+ break; -+ -+ case Opt_trunc_xib: -+ au_fset_opts(opts->flags, TRUNC_XIB); -+ break; -+ case Opt_notrunc_xib: -+ au_fclr_opts(opts->flags, TRUNC_XIB); -+ break; -+ -+ case Opt_dirren: -+ err = 1; -+ if (!au_opt_test(sbinfo->si_mntflags, DIRREN)) { -+ err = au_dr_opt_set(sb); -+ if (!err) -+ err = 1; -+ } -+ if (err == 1) -+ au_opt_set(sbinfo->si_mntflags, DIRREN); -+ break; -+ case Opt_nodirren: -+ err = 1; -+ if (au_opt_test(sbinfo->si_mntflags, DIRREN)) { -+ err = au_dr_opt_clr(sb, au_ftest_opts(opts->flags, -+ DR_FLUSHED)); -+ if (!err) -+ err = 1; -+ } -+ if (err == 1) -+ au_opt_clr(sbinfo->si_mntflags, DIRREN); -+ break; -+ -+ case Opt_acl: -+ sb->s_flags |= SB_POSIXACL; -+ break; -+ case Opt_noacl: -+ sb->s_flags &= ~SB_POSIXACL; -+ break; -+ -+ default: -+ err = 0; -+ break; -+ } -+ -+ return err; -+} -+ -+/* -+ * returns tri-state. -+ * plus: processed without an error -+ * zero: unprocessed -+ * minus: error -+ */ -+static int au_opt_br(struct super_block *sb, struct au_opt *opt, -+ struct au_opts *opts) -+{ -+ int err, do_refresh; -+ -+ err = 0; -+ switch (opt->type) { -+ case Opt_append: -+ opt->add.bindex = au_sbbot(sb) + 1; -+ if (opt->add.bindex < 0) -+ opt->add.bindex = 0; -+ goto add; -+ case Opt_prepend: -+ opt->add.bindex = 0; -+ add: /* indented label */ -+ case Opt_add: -+ err = au_br_add(sb, &opt->add, -+ au_ftest_opts(opts->flags, REMOUNT)); -+ if (!err) { -+ err = 1; -+ au_fset_opts(opts->flags, REFRESH); -+ } -+ break; -+ -+ case Opt_del: -+ case Opt_idel: -+ err = au_br_del(sb, &opt->del, -+ au_ftest_opts(opts->flags, REMOUNT)); -+ if (!err) { -+ err = 1; -+ au_fset_opts(opts->flags, TRUNC_XIB); -+ au_fset_opts(opts->flags, REFRESH); -+ } -+ break; -+ -+ case Opt_mod: -+ case Opt_imod: -+ err = au_br_mod(sb, &opt->mod, -+ au_ftest_opts(opts->flags, REMOUNT), -+ &do_refresh); -+ if (!err) { -+ err = 1; -+ if (do_refresh) -+ au_fset_opts(opts->flags, REFRESH); -+ } -+ break; -+ } -+ return err; -+} -+ -+static int au_opt_xino(struct super_block *sb, struct au_opt *opt, -+ struct au_opt_xino **opt_xino, -+ struct au_opts *opts) -+{ -+ int err; -+ -+ err = 0; -+ switch (opt->type) { -+ case Opt_xino: -+ err = au_xino_set(sb, &opt->xino, -+ !!au_ftest_opts(opts->flags, REMOUNT)); -+ if (unlikely(err)) -+ break; -+ -+ *opt_xino = &opt->xino; -+ break; -+ -+ case Opt_noxino: -+ au_xino_clr(sb); -+ *opt_xino = (void *)-1; -+ break; -+ } -+ -+ return err; -+} -+ -+int au_opts_verify(struct super_block *sb, unsigned long sb_flags, -+ unsigned int pending) -+{ -+ int err, fhsm; -+ aufs_bindex_t bindex, bbot; -+ unsigned char do_plink, skip, do_free, can_no_dreval; -+ struct au_branch *br; -+ struct au_wbr *wbr; -+ struct dentry *root, *dentry; -+ struct inode *dir, *h_dir; -+ struct au_sbinfo *sbinfo; -+ struct au_hinode *hdir; -+ -+ SiMustAnyLock(sb); -+ -+ sbinfo = au_sbi(sb); -+ AuDebugOn(!(sbinfo->si_mntflags & AuOptMask_UDBA)); -+ -+ if (!(sb_flags & SB_RDONLY)) { -+ if (unlikely(!au_br_writable(au_sbr_perm(sb, 0)))) -+ pr_warn("first branch should be rw\n"); -+ if (unlikely(au_opt_test(sbinfo->si_mntflags, SHWH))) -+ pr_warn_once("shwh should be used with ro\n"); -+ } -+ -+ if (au_opt_test((sbinfo->si_mntflags | pending), UDBA_HNOTIFY) -+ && !au_opt_test(sbinfo->si_mntflags, XINO)) -+ pr_warn_once("udba=*notify requires xino\n"); -+ -+ if (au_opt_test(sbinfo->si_mntflags, DIRPERM1)) -+ pr_warn_once("dirperm1 breaks the protection" -+ " by the permission bits on the lower branch\n"); -+ -+ err = 0; -+ fhsm = 0; -+ root = sb->s_root; -+ dir = d_inode(root); -+ do_plink = !!au_opt_test(sbinfo->si_mntflags, PLINK); -+ can_no_dreval = !!au_opt_test((sbinfo->si_mntflags | pending), -+ UDBA_NONE); -+ bbot = au_sbbot(sb); -+ for (bindex = 0; !err && bindex <= bbot; bindex++) { -+ skip = 0; -+ h_dir = au_h_iptr(dir, bindex); -+ br = au_sbr(sb, bindex); -+ -+ if ((br->br_perm & AuBrAttr_ICEX) -+ && !h_dir->i_op->listxattr) -+ br->br_perm &= ~AuBrAttr_ICEX; -+#if 0 -+ if ((br->br_perm & AuBrAttr_ICEX_SEC) -+ && (au_br_sb(br)->s_flags & SB_NOSEC)) -+ br->br_perm &= ~AuBrAttr_ICEX_SEC; -+#endif -+ -+ do_free = 0; -+ wbr = br->br_wbr; -+ if (wbr) -+ wbr_wh_read_lock(wbr); -+ -+ if (!au_br_writable(br->br_perm)) { -+ do_free = !!wbr; -+ skip = (!wbr -+ || (!wbr->wbr_whbase -+ && !wbr->wbr_plink -+ && !wbr->wbr_orph)); -+ } else if (!au_br_wh_linkable(br->br_perm)) { -+ /* skip = (!br->br_whbase && !br->br_orph); */ -+ skip = (!wbr || !wbr->wbr_whbase); -+ if (skip && wbr) { -+ if (do_plink) -+ skip = !!wbr->wbr_plink; -+ else -+ skip = !wbr->wbr_plink; -+ } -+ } else { -+ /* skip = (br->br_whbase && br->br_ohph); */ -+ skip = (wbr && wbr->wbr_whbase); -+ if (skip) { -+ if (do_plink) -+ skip = !!wbr->wbr_plink; -+ else -+ skip = !wbr->wbr_plink; -+ } -+ } -+ if (wbr) -+ wbr_wh_read_unlock(wbr); -+ -+ if (can_no_dreval) { -+ dentry = br->br_path.dentry; -+ spin_lock(&dentry->d_lock); -+ if (dentry->d_flags & -+ (DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE)) -+ can_no_dreval = 0; -+ spin_unlock(&dentry->d_lock); -+ } -+ -+ if (au_br_fhsm(br->br_perm)) { -+ fhsm++; -+ AuDebugOn(!br->br_fhsm); -+ } -+ -+ if (skip) -+ continue; -+ -+ hdir = au_hi(dir, bindex); -+ au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); -+ if (wbr) -+ wbr_wh_write_lock(wbr); -+ err = au_wh_init(br, sb); -+ if (wbr) -+ wbr_wh_write_unlock(wbr); -+ au_hn_inode_unlock(hdir); -+ -+ if (!err && do_free) { -+ au_kfree_rcu(wbr); -+ br->br_wbr = NULL; -+ } -+ } -+ -+ if (can_no_dreval) -+ au_fset_si(sbinfo, NO_DREVAL); -+ else -+ au_fclr_si(sbinfo, NO_DREVAL); -+ -+ if (fhsm >= 2) { -+ au_fset_si(sbinfo, FHSM); -+ for (bindex = bbot; bindex >= 0; bindex--) { -+ br = au_sbr(sb, bindex); -+ if (au_br_fhsm(br->br_perm)) { -+ au_fhsm_set_bottom(sb, bindex); -+ break; -+ } -+ } -+ } else { -+ au_fclr_si(sbinfo, FHSM); -+ au_fhsm_set_bottom(sb, -1); -+ } -+ -+ return err; -+} -+ -+int au_opts_mount(struct super_block *sb, struct au_opts *opts) -+{ -+ int err; -+ unsigned int tmp; -+ aufs_bindex_t bindex, bbot; -+ struct au_opt *opt; -+ struct au_opt_xino *opt_xino, xino; -+ struct au_sbinfo *sbinfo; -+ struct au_branch *br; -+ struct inode *dir; -+ -+ SiMustWriteLock(sb); -+ -+ err = 0; -+ opt_xino = NULL; -+ opt = opts->opt; -+ while (err >= 0 && opt->type != Opt_tail) -+ err = au_opt_simple(sb, opt++, opts); -+ if (err > 0) -+ err = 0; -+ else if (unlikely(err < 0)) -+ goto out; -+ -+ /* disable xino and udba temporary */ -+ sbinfo = au_sbi(sb); -+ tmp = sbinfo->si_mntflags; -+ au_opt_clr(sbinfo->si_mntflags, XINO); -+ au_opt_set_udba(sbinfo->si_mntflags, UDBA_REVAL); -+ -+ opt = opts->opt; -+ while (err >= 0 && opt->type != Opt_tail) -+ err = au_opt_br(sb, opt++, opts); -+ if (err > 0) -+ err = 0; -+ else if (unlikely(err < 0)) -+ goto out; -+ -+ bbot = au_sbbot(sb); -+ if (unlikely(bbot < 0)) { -+ err = -EINVAL; -+ pr_err("no branches\n"); -+ goto out; -+ } -+ -+ if (au_opt_test(tmp, XINO)) -+ au_opt_set(sbinfo->si_mntflags, XINO); -+ opt = opts->opt; -+ while (!err && opt->type != Opt_tail) -+ err = au_opt_xino(sb, opt++, &opt_xino, opts); -+ if (unlikely(err)) -+ goto out; -+ -+ err = au_opts_verify(sb, sb->s_flags, tmp); -+ if (unlikely(err)) -+ goto out; -+ -+ /* restore xino */ -+ if (au_opt_test(tmp, XINO) && !opt_xino) { -+ xino.file = au_xino_def(sb); -+ err = PTR_ERR(xino.file); -+ if (IS_ERR(xino.file)) -+ goto out; -+ -+ err = au_xino_set(sb, &xino, /*remount*/0); -+ fput(xino.file); -+ if (unlikely(err)) -+ goto out; -+ } -+ -+ /* restore udba */ -+ tmp &= AuOptMask_UDBA; -+ sbinfo->si_mntflags &= ~AuOptMask_UDBA; -+ sbinfo->si_mntflags |= tmp; -+ bbot = au_sbbot(sb); -+ for (bindex = 0; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ err = au_hnotify_reset_br(tmp, br, br->br_perm); -+ if (unlikely(err)) -+ AuIOErr("hnotify failed on br %d, %d, ignored\n", -+ bindex, err); -+ /* go on even if err */ -+ } -+ if (au_opt_test(tmp, UDBA_HNOTIFY)) { -+ dir = d_inode(sb->s_root); -+ au_hn_reset(dir, au_hi_flags(dir, /*isdir*/1) & ~AuHi_XINO); -+ } -+ -+out: -+ return err; -+} -+ -+int au_opts_remount(struct super_block *sb, struct au_opts *opts) -+{ -+ int err, rerr; -+ unsigned char no_dreval; -+ struct inode *dir; -+ struct au_opt_xino *opt_xino; -+ struct au_opt *opt; -+ struct au_sbinfo *sbinfo; -+ -+ SiMustWriteLock(sb); -+ -+ err = au_dr_opt_flush(sb); -+ if (unlikely(err)) -+ goto out; -+ au_fset_opts(opts->flags, DR_FLUSHED); -+ -+ dir = d_inode(sb->s_root); -+ sbinfo = au_sbi(sb); -+ opt_xino = NULL; -+ opt = opts->opt; -+ while (err >= 0 && opt->type != Opt_tail) { -+ err = au_opt_simple(sb, opt, opts); -+ if (!err) -+ err = au_opt_br(sb, opt, opts); -+ if (!err) -+ err = au_opt_xino(sb, opt, &opt_xino, opts); -+ opt++; -+ } -+ if (err > 0) -+ err = 0; -+ AuTraceErr(err); -+ /* go on even err */ -+ -+ no_dreval = !!au_ftest_si(sbinfo, NO_DREVAL); -+ rerr = au_opts_verify(sb, opts->sb_flags, /*pending*/0); -+ if (unlikely(rerr && !err)) -+ err = rerr; -+ -+ if (no_dreval != !!au_ftest_si(sbinfo, NO_DREVAL)) -+ au_fset_opts(opts->flags, REFRESH_IDOP); -+ -+ if (au_ftest_opts(opts->flags, TRUNC_XIB)) { -+ rerr = au_xib_trunc(sb); -+ if (unlikely(rerr && !err)) -+ err = rerr; -+ } -+ -+ /* will be handled by the caller */ -+ if (!au_ftest_opts(opts->flags, REFRESH) -+ && (opts->given_udba -+ || au_opt_test(sbinfo->si_mntflags, XINO) -+ || au_ftest_opts(opts->flags, REFRESH_IDOP) -+ )) -+ au_fset_opts(opts->flags, REFRESH); -+ -+ AuDbg("status 0x%x\n", opts->flags); -+ -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+unsigned int au_opt_udba(struct super_block *sb) -+{ -+ return au_mntflags(sb) & AuOptMask_UDBA; -+} -diff --git a/fs/aufs/opts.h b/fs/aufs/opts.h -new file mode 100644 -index 000000000000..6326b54340c7 ---- /dev/null -+++ b/fs/aufs/opts.h -@@ -0,0 +1,225 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * mount options/flags -+ */ -+ -+#ifndef __AUFS_OPTS_H__ -+#define __AUFS_OPTS_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/path.h> -+ -+struct file; -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* mount flags */ -+#define AuOpt_XINO 1 /* external inode number bitmap -+ and translation table */ -+#define AuOpt_TRUNC_XINO (1 << 1) /* truncate xino files */ -+#define AuOpt_UDBA_NONE (1 << 2) /* users direct branch access */ -+#define AuOpt_UDBA_REVAL (1 << 3) -+#define AuOpt_UDBA_HNOTIFY (1 << 4) -+#define AuOpt_SHWH (1 << 5) /* show whiteout */ -+#define AuOpt_PLINK (1 << 6) /* pseudo-link */ -+#define AuOpt_DIRPERM1 (1 << 7) /* ignore the lower dir's perm -+ bits */ -+#define AuOpt_ALWAYS_DIROPQ (1 << 9) /* policy to creating diropq */ -+#define AuOpt_SUM (1 << 10) /* summation for statfs(2) */ -+#define AuOpt_SUM_W (1 << 11) /* unimplemented */ -+#define AuOpt_WARN_PERM (1 << 12) /* warn when add-branch */ -+#define AuOpt_VERBOSE (1 << 13) /* print the cause of error */ -+#define AuOpt_DIO (1 << 14) /* direct io */ -+#define AuOpt_DIRREN (1 << 15) /* directory rename */ -+ -+#ifndef CONFIG_AUFS_HNOTIFY -+#undef AuOpt_UDBA_HNOTIFY -+#define AuOpt_UDBA_HNOTIFY 0 -+#endif -+#ifndef CONFIG_AUFS_DIRREN -+#undef AuOpt_DIRREN -+#define AuOpt_DIRREN 0 -+#endif -+#ifndef CONFIG_AUFS_SHWH -+#undef AuOpt_SHWH -+#define AuOpt_SHWH 0 -+#endif -+ -+#define AuOpt_Def (AuOpt_XINO \ -+ | AuOpt_UDBA_REVAL \ -+ | AuOpt_PLINK \ -+ /* | AuOpt_DIRPERM1 */ \ -+ | AuOpt_WARN_PERM) -+#define AuOptMask_UDBA (AuOpt_UDBA_NONE \ -+ | AuOpt_UDBA_REVAL \ -+ | AuOpt_UDBA_HNOTIFY) -+ -+#define au_opt_test(flags, name) (flags & AuOpt_##name) -+#define au_opt_set(flags, name) do { \ -+ BUILD_BUG_ON(AuOpt_##name & AuOptMask_UDBA); \ -+ ((flags) |= AuOpt_##name); \ -+} while (0) -+#define au_opt_set_udba(flags, name) do { \ -+ (flags) &= ~AuOptMask_UDBA; \ -+ ((flags) |= AuOpt_##name); \ -+} while (0) -+#define au_opt_clr(flags, name) do { \ -+ ((flags) &= ~AuOpt_##name); \ -+} while (0) -+ -+static inline unsigned int au_opts_plink(unsigned int mntflags) -+{ -+#ifdef CONFIG_PROC_FS -+ return mntflags; -+#else -+ return mntflags & ~AuOpt_PLINK; -+#endif -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* policies to select one among multiple writable branches */ -+enum { -+ AuWbrCreate_TDP, /* top down parent */ -+ AuWbrCreate_RR, /* round robin */ -+ AuWbrCreate_MFS, /* most free space */ -+ AuWbrCreate_MFSV, /* mfs with seconds */ -+ AuWbrCreate_MFSRR, /* mfs then rr */ -+ AuWbrCreate_MFSRRV, /* mfs then rr with seconds */ -+ AuWbrCreate_TDMFS, /* top down regardless parent and mfs */ -+ AuWbrCreate_TDMFSV, /* top down regardless parent and mfs */ -+ AuWbrCreate_PMFS, /* parent and mfs */ -+ AuWbrCreate_PMFSV, /* parent and mfs with seconds */ -+ AuWbrCreate_PMFSRR, /* parent, mfs and round-robin */ -+ AuWbrCreate_PMFSRRV, /* plus seconds */ -+ -+ AuWbrCreate_Def = AuWbrCreate_TDP -+}; -+ -+enum { -+ AuWbrCopyup_TDP, /* top down parent */ -+ AuWbrCopyup_BUP, /* bottom up parent */ -+ AuWbrCopyup_BU, /* bottom up */ -+ -+ AuWbrCopyup_Def = AuWbrCopyup_TDP -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct au_opt_add { -+ aufs_bindex_t bindex; -+ char *pathname; -+ int perm; -+ struct path path; -+}; -+ -+struct au_opt_del { -+ char *pathname; -+ struct path h_path; -+}; -+ -+struct au_opt_mod { -+ char *path; -+ int perm; -+ struct dentry *h_root; -+}; -+ -+struct au_opt_xino { -+ char *path; -+ struct file *file; -+}; -+ -+struct au_opt_xino_itrunc { -+ aufs_bindex_t bindex; -+}; -+ -+struct au_opt_wbr_create { -+ int wbr_create; -+ int mfs_second; -+ unsigned long long mfsrr_watermark; -+}; -+ -+struct au_opt { -+ int type; -+ union { -+ struct au_opt_xino xino; -+ struct au_opt_xino_itrunc xino_itrunc; -+ struct au_opt_add add; -+ struct au_opt_del del; -+ struct au_opt_mod mod; -+ int dirwh; -+ int rdcache; -+ unsigned int rdblk; -+ unsigned int rdhash; -+ int udba; -+ struct au_opt_wbr_create wbr_create; -+ int wbr_copyup; -+ unsigned int fhsm_second; -+ }; -+}; -+ -+/* opts flags */ -+#define AuOpts_REMOUNT 1 -+#define AuOpts_REFRESH (1 << 1) -+#define AuOpts_TRUNC_XIB (1 << 2) -+#define AuOpts_REFRESH_DYAOP (1 << 3) -+#define AuOpts_REFRESH_IDOP (1 << 4) -+#define AuOpts_DR_FLUSHED (1 << 5) -+#define au_ftest_opts(flags, name) ((flags) & AuOpts_##name) -+#define au_fset_opts(flags, name) \ -+ do { (flags) |= AuOpts_##name; } while (0) -+#define au_fclr_opts(flags, name) \ -+ do { (flags) &= ~AuOpts_##name; } while (0) -+ -+#ifndef CONFIG_AUFS_DIRREN -+#undef AuOpts_DR_FLUSHED -+#define AuOpts_DR_FLUSHED 0 -+#endif -+ -+struct au_opts { -+ struct au_opt *opt; -+ int max_opt; -+ -+ unsigned int given_udba; -+ unsigned int flags; -+ unsigned long sb_flags; -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* opts.c */ -+void au_optstr_br_perm(au_br_perm_str_t *str, int perm); -+const char *au_optstr_udba(int udba); -+const char *au_optstr_wbr_copyup(int wbr_copyup); -+const char *au_optstr_wbr_create(int wbr_create); -+ -+void au_opts_free(struct au_opts *opts); -+struct super_block; -+int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts); -+int au_opts_verify(struct super_block *sb, unsigned long sb_flags, -+ unsigned int pending); -+int au_opts_mount(struct super_block *sb, struct au_opts *opts); -+int au_opts_remount(struct super_block *sb, struct au_opts *opts); -+ -+unsigned int au_opt_udba(struct super_block *sb); -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_OPTS_H__ */ -diff --git a/fs/aufs/plink.c b/fs/aufs/plink.c -new file mode 100644 -index 000000000000..718edb8827a3 ---- /dev/null -+++ b/fs/aufs/plink.c -@@ -0,0 +1,516 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * pseudo-link -+ */ -+ -+#include "aufs.h" -+ -+/* -+ * the pseudo-link maintenance mode. -+ * during a user process maintains the pseudo-links, -+ * prohibit adding a new plink and branch manipulation. -+ * -+ * Flags -+ * NOPLM: -+ * For entry functions which will handle plink, and i_mutex is already held -+ * in VFS. -+ * They cannot wait and should return an error at once. -+ * Callers has to check the error. -+ * NOPLMW: -+ * For entry functions which will handle plink, but i_mutex is not held -+ * in VFS. -+ * They can wait the plink maintenance mode to finish. -+ * -+ * They behave like F_SETLK and F_SETLKW. -+ * If the caller never handle plink, then both flags are unnecessary. -+ */ -+ -+int au_plink_maint(struct super_block *sb, int flags) -+{ -+ int err; -+ pid_t pid, ppid; -+ struct task_struct *parent, *prev; -+ struct au_sbinfo *sbi; -+ -+ SiMustAnyLock(sb); -+ -+ err = 0; -+ if (!au_opt_test(au_mntflags(sb), PLINK)) -+ goto out; -+ -+ sbi = au_sbi(sb); -+ pid = sbi->si_plink_maint_pid; -+ if (!pid || pid == current->pid) -+ goto out; -+ -+ /* todo: it highly depends upon /sbin/mount.aufs */ -+ prev = NULL; -+ parent = current; -+ ppid = 0; -+ rcu_read_lock(); -+ while (1) { -+ parent = rcu_dereference(parent->real_parent); -+ if (parent == prev) -+ break; -+ ppid = task_pid_vnr(parent); -+ if (pid == ppid) { -+ rcu_read_unlock(); -+ goto out; -+ } -+ prev = parent; -+ } -+ rcu_read_unlock(); -+ -+ if (au_ftest_lock(flags, NOPLMW)) { -+ /* if there is no i_mutex lock in VFS, we don't need to wait */ -+ /* AuDebugOn(!lockdep_depth(current)); */ -+ while (sbi->si_plink_maint_pid) { -+ si_read_unlock(sb); -+ /* gave up wake_up_bit() */ -+ wait_event(sbi->si_plink_wq, !sbi->si_plink_maint_pid); -+ -+ if (au_ftest_lock(flags, FLUSH)) -+ au_nwt_flush(&sbi->si_nowait); -+ si_noflush_read_lock(sb); -+ } -+ } else if (au_ftest_lock(flags, NOPLM)) { -+ AuDbg("ppid %d, pid %d\n", ppid, pid); -+ err = -EAGAIN; -+ } -+ -+out: -+ return err; -+} -+ -+void au_plink_maint_leave(struct au_sbinfo *sbinfo) -+{ -+ spin_lock(&sbinfo->si_plink_maint_lock); -+ sbinfo->si_plink_maint_pid = 0; -+ spin_unlock(&sbinfo->si_plink_maint_lock); -+ wake_up_all(&sbinfo->si_plink_wq); -+} -+ -+int au_plink_maint_enter(struct super_block *sb) -+{ -+ int err; -+ struct au_sbinfo *sbinfo; -+ -+ err = 0; -+ sbinfo = au_sbi(sb); -+ /* make sure i am the only one in this fs */ -+ si_write_lock(sb, AuLock_FLUSH); -+ if (au_opt_test(au_mntflags(sb), PLINK)) { -+ spin_lock(&sbinfo->si_plink_maint_lock); -+ if (!sbinfo->si_plink_maint_pid) -+ sbinfo->si_plink_maint_pid = current->pid; -+ else -+ err = -EBUSY; -+ spin_unlock(&sbinfo->si_plink_maint_lock); -+ } -+ si_write_unlock(sb); -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+#ifdef CONFIG_AUFS_DEBUG -+void au_plink_list(struct super_block *sb) -+{ -+ int i; -+ struct au_sbinfo *sbinfo; -+ struct hlist_bl_head *hbl; -+ struct hlist_bl_node *pos; -+ struct au_icntnr *icntnr; -+ -+ SiMustAnyLock(sb); -+ -+ sbinfo = au_sbi(sb); -+ AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); -+ AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); -+ -+ for (i = 0; i < AuPlink_NHASH; i++) { -+ hbl = sbinfo->si_plink + i; -+ hlist_bl_lock(hbl); -+ hlist_bl_for_each_entry(icntnr, pos, hbl, plink) -+ AuDbg("%lu\n", icntnr->vfs_inode.i_ino); -+ hlist_bl_unlock(hbl); -+ } -+} -+#endif -+ -+/* is the inode pseudo-linked? */ -+int au_plink_test(struct inode *inode) -+{ -+ int found, i; -+ struct au_sbinfo *sbinfo; -+ struct hlist_bl_head *hbl; -+ struct hlist_bl_node *pos; -+ struct au_icntnr *icntnr; -+ -+ sbinfo = au_sbi(inode->i_sb); -+ AuRwMustAnyLock(&sbinfo->si_rwsem); -+ AuDebugOn(!au_opt_test(au_mntflags(inode->i_sb), PLINK)); -+ AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM)); -+ -+ found = 0; -+ i = au_plink_hash(inode->i_ino); -+ hbl = sbinfo->si_plink + i; -+ hlist_bl_lock(hbl); -+ hlist_bl_for_each_entry(icntnr, pos, hbl, plink) -+ if (&icntnr->vfs_inode == inode) { -+ found = 1; -+ break; -+ } -+ hlist_bl_unlock(hbl); -+ return found; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * generate a name for plink. -+ * the file will be stored under AUFS_WH_PLINKDIR. -+ */ -+/* 20 is max digits length of ulong 64 */ -+#define PLINK_NAME_LEN ((20 + 1) * 2) -+ -+static int plink_name(char *name, int len, struct inode *inode, -+ aufs_bindex_t bindex) -+{ -+ int rlen; -+ struct inode *h_inode; -+ -+ h_inode = au_h_iptr(inode, bindex); -+ rlen = snprintf(name, len, "%lu.%lu", inode->i_ino, h_inode->i_ino); -+ return rlen; -+} -+ -+struct au_do_plink_lkup_args { -+ struct dentry **errp; -+ struct qstr *tgtname; -+ struct dentry *h_parent; -+ struct au_branch *br; -+}; -+ -+static struct dentry *au_do_plink_lkup(struct qstr *tgtname, -+ struct dentry *h_parent, -+ struct au_branch *br) -+{ -+ struct dentry *h_dentry; -+ struct inode *h_inode; -+ -+ h_inode = d_inode(h_parent); -+ inode_lock_shared_nested(h_inode, AuLsc_I_CHILD2); -+ h_dentry = vfsub_lkup_one(tgtname, h_parent); -+ inode_unlock_shared(h_inode); -+ return h_dentry; -+} -+ -+static void au_call_do_plink_lkup(void *args) -+{ -+ struct au_do_plink_lkup_args *a = args; -+ *a->errp = au_do_plink_lkup(a->tgtname, a->h_parent, a->br); -+} -+ -+/* lookup the plink-ed @inode under the branch at @bindex */ -+struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex) -+{ -+ struct dentry *h_dentry, *h_parent; -+ struct au_branch *br; -+ int wkq_err; -+ char a[PLINK_NAME_LEN]; -+ struct qstr tgtname = QSTR_INIT(a, 0); -+ -+ AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM)); -+ -+ br = au_sbr(inode->i_sb, bindex); -+ h_parent = br->br_wbr->wbr_plink; -+ tgtname.len = plink_name(a, sizeof(a), inode, bindex); -+ -+ if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) { -+ struct au_do_plink_lkup_args args = { -+ .errp = &h_dentry, -+ .tgtname = &tgtname, -+ .h_parent = h_parent, -+ .br = br -+ }; -+ -+ wkq_err = au_wkq_wait(au_call_do_plink_lkup, &args); -+ if (unlikely(wkq_err)) -+ h_dentry = ERR_PTR(wkq_err); -+ } else -+ h_dentry = au_do_plink_lkup(&tgtname, h_parent, br); -+ -+ return h_dentry; -+} -+ -+/* create a pseudo-link */ -+static int do_whplink(struct qstr *tgt, struct dentry *h_parent, -+ struct dentry *h_dentry, struct au_branch *br) -+{ -+ int err; -+ struct path h_path = { -+ .mnt = au_br_mnt(br) -+ }; -+ struct inode *h_dir, *delegated; -+ -+ h_dir = d_inode(h_parent); -+ inode_lock_nested(h_dir, AuLsc_I_CHILD2); -+again: -+ h_path.dentry = vfsub_lkup_one(tgt, h_parent); -+ err = PTR_ERR(h_path.dentry); -+ if (IS_ERR(h_path.dentry)) -+ goto out; -+ -+ err = 0; -+ /* wh.plink dir is not monitored */ -+ /* todo: is it really safe? */ -+ if (d_is_positive(h_path.dentry) -+ && d_inode(h_path.dentry) != d_inode(h_dentry)) { -+ delegated = NULL; -+ err = vfsub_unlink(h_dir, &h_path, &delegated, /*force*/0); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal unlink\n"); -+ iput(delegated); -+ } -+ dput(h_path.dentry); -+ h_path.dentry = NULL; -+ if (!err) -+ goto again; -+ } -+ if (!err && d_is_negative(h_path.dentry)) { -+ delegated = NULL; -+ err = vfsub_link(h_dentry, h_dir, &h_path, &delegated); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal link\n"); -+ iput(delegated); -+ } -+ } -+ dput(h_path.dentry); -+ -+out: -+ inode_unlock(h_dir); -+ return err; -+} -+ -+struct do_whplink_args { -+ int *errp; -+ struct qstr *tgt; -+ struct dentry *h_parent; -+ struct dentry *h_dentry; -+ struct au_branch *br; -+}; -+ -+static void call_do_whplink(void *args) -+{ -+ struct do_whplink_args *a = args; -+ *a->errp = do_whplink(a->tgt, a->h_parent, a->h_dentry, a->br); -+} -+ -+static int whplink(struct dentry *h_dentry, struct inode *inode, -+ aufs_bindex_t bindex, struct au_branch *br) -+{ -+ int err, wkq_err; -+ struct au_wbr *wbr; -+ struct dentry *h_parent; -+ char a[PLINK_NAME_LEN]; -+ struct qstr tgtname = QSTR_INIT(a, 0); -+ -+ wbr = au_sbr(inode->i_sb, bindex)->br_wbr; -+ h_parent = wbr->wbr_plink; -+ tgtname.len = plink_name(a, sizeof(a), inode, bindex); -+ -+ /* always superio. */ -+ if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) { -+ struct do_whplink_args args = { -+ .errp = &err, -+ .tgt = &tgtname, -+ .h_parent = h_parent, -+ .h_dentry = h_dentry, -+ .br = br -+ }; -+ wkq_err = au_wkq_wait(call_do_whplink, &args); -+ if (unlikely(wkq_err)) -+ err = wkq_err; -+ } else -+ err = do_whplink(&tgtname, h_parent, h_dentry, br); -+ -+ return err; -+} -+ -+/* -+ * create a new pseudo-link for @h_dentry on @bindex. -+ * the linked inode is held in aufs @inode. -+ */ -+void au_plink_append(struct inode *inode, aufs_bindex_t bindex, -+ struct dentry *h_dentry) -+{ -+ struct super_block *sb; -+ struct au_sbinfo *sbinfo; -+ struct hlist_bl_head *hbl; -+ struct hlist_bl_node *pos; -+ struct au_icntnr *icntnr; -+ int found, err, cnt, i; -+ -+ sb = inode->i_sb; -+ sbinfo = au_sbi(sb); -+ AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); -+ AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); -+ -+ found = au_plink_test(inode); -+ if (found) -+ return; -+ -+ i = au_plink_hash(inode->i_ino); -+ hbl = sbinfo->si_plink + i; -+ au_igrab(inode); -+ -+ hlist_bl_lock(hbl); -+ hlist_bl_for_each_entry(icntnr, pos, hbl, plink) { -+ if (&icntnr->vfs_inode == inode) { -+ found = 1; -+ break; -+ } -+ } -+ if (!found) { -+ icntnr = container_of(inode, struct au_icntnr, vfs_inode); -+ hlist_bl_add_head(&icntnr->plink, hbl); -+ } -+ hlist_bl_unlock(hbl); -+ if (!found) { -+ cnt = au_hbl_count(hbl); -+#define msg "unexpectedly unbalanced or too many pseudo-links" -+ if (cnt > AUFS_PLINK_WARN) -+ AuWarn1(msg ", %d\n", cnt); -+#undef msg -+ err = whplink(h_dentry, inode, bindex, au_sbr(sb, bindex)); -+ if (unlikely(err)) { -+ pr_warn("err %d, damaged pseudo link.\n", err); -+ au_hbl_del(&icntnr->plink, hbl); -+ iput(&icntnr->vfs_inode); -+ } -+ } else -+ iput(&icntnr->vfs_inode); -+} -+ -+/* free all plinks */ -+void au_plink_put(struct super_block *sb, int verbose) -+{ -+ int i, warned; -+ struct au_sbinfo *sbinfo; -+ struct hlist_bl_head *hbl; -+ struct hlist_bl_node *pos, *tmp; -+ struct au_icntnr *icntnr; -+ -+ SiMustWriteLock(sb); -+ -+ sbinfo = au_sbi(sb); -+ AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); -+ AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); -+ -+ /* no spin_lock since sbinfo is write-locked */ -+ warned = 0; -+ for (i = 0; i < AuPlink_NHASH; i++) { -+ hbl = sbinfo->si_plink + i; -+ if (!warned && verbose && !hlist_bl_empty(hbl)) { -+ pr_warn("pseudo-link is not flushed"); -+ warned = 1; -+ } -+ hlist_bl_for_each_entry_safe(icntnr, pos, tmp, hbl, plink) -+ iput(&icntnr->vfs_inode); -+ INIT_HLIST_BL_HEAD(hbl); -+ } -+} -+ -+void au_plink_clean(struct super_block *sb, int verbose) -+{ -+ struct dentry *root; -+ -+ root = sb->s_root; -+ aufs_write_lock(root); -+ if (au_opt_test(au_mntflags(sb), PLINK)) -+ au_plink_put(sb, verbose); -+ aufs_write_unlock(root); -+} -+ -+static int au_plink_do_half_refresh(struct inode *inode, aufs_bindex_t br_id) -+{ -+ int do_put; -+ aufs_bindex_t btop, bbot, bindex; -+ -+ do_put = 0; -+ btop = au_ibtop(inode); -+ bbot = au_ibbot(inode); -+ if (btop >= 0) { -+ for (bindex = btop; bindex <= bbot; bindex++) { -+ if (!au_h_iptr(inode, bindex) -+ || au_ii_br_id(inode, bindex) != br_id) -+ continue; -+ au_set_h_iptr(inode, bindex, NULL, 0); -+ do_put = 1; -+ break; -+ } -+ if (do_put) -+ for (bindex = btop; bindex <= bbot; bindex++) -+ if (au_h_iptr(inode, bindex)) { -+ do_put = 0; -+ break; -+ } -+ } else -+ do_put = 1; -+ -+ return do_put; -+} -+ -+/* free the plinks on a branch specified by @br_id */ -+void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id) -+{ -+ struct au_sbinfo *sbinfo; -+ struct hlist_bl_head *hbl; -+ struct hlist_bl_node *pos, *tmp; -+ struct au_icntnr *icntnr; -+ struct inode *inode; -+ int i, do_put; -+ -+ SiMustWriteLock(sb); -+ -+ sbinfo = au_sbi(sb); -+ AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); -+ AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); -+ -+ /* no bit_lock since sbinfo is write-locked */ -+ for (i = 0; i < AuPlink_NHASH; i++) { -+ hbl = sbinfo->si_plink + i; -+ hlist_bl_for_each_entry_safe(icntnr, pos, tmp, hbl, plink) { -+ inode = au_igrab(&icntnr->vfs_inode); -+ ii_write_lock_child(inode); -+ do_put = au_plink_do_half_refresh(inode, br_id); -+ if (do_put) { -+ hlist_bl_del(&icntnr->plink); -+ iput(inode); -+ } -+ ii_write_unlock(inode); -+ iput(inode); -+ } -+ } -+} -diff --git a/fs/aufs/poll.c b/fs/aufs/poll.c -new file mode 100644 -index 000000000000..c48c6cb6491f ---- /dev/null -+++ b/fs/aufs/poll.c -@@ -0,0 +1,51 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * poll operation -+ * There is only one filesystem which implements ->poll operation, currently. -+ */ -+ -+#include "aufs.h" -+ -+__poll_t aufs_poll(struct file *file, struct poll_table_struct *pt) -+{ -+ __poll_t mask; -+ struct file *h_file; -+ struct super_block *sb; -+ -+ /* We should pretend an error happened. */ -+ mask = EPOLLERR /* | EPOLLIN | EPOLLOUT */; -+ sb = file->f_path.dentry->d_sb; -+ si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); -+ -+ h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); -+ if (IS_ERR(h_file)) { -+ AuDbg("h_file %ld\n", PTR_ERR(h_file)); -+ goto out; -+ } -+ -+ mask = vfs_poll(h_file, pt); -+ fput(h_file); /* instead of au_read_post() */ -+ -+out: -+ si_read_unlock(sb); -+ if (mask & EPOLLERR) -+ AuDbg("mask 0x%x\n", mask); -+ return mask; -+} -diff --git a/fs/aufs/posix_acl.c b/fs/aufs/posix_acl.c -new file mode 100644 -index 000000000000..67a4bbffdf5f ---- /dev/null -+++ b/fs/aufs/posix_acl.c -@@ -0,0 +1,103 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2014-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * posix acl operations -+ */ -+ -+#include <linux/fs.h> -+#include "aufs.h" -+ -+struct posix_acl *aufs_get_acl(struct inode *inode, int type) -+{ -+ struct posix_acl *acl; -+ int err; -+ aufs_bindex_t bindex; -+ struct inode *h_inode; -+ struct super_block *sb; -+ -+ acl = NULL; -+ sb = inode->i_sb; -+ si_read_lock(sb, AuLock_FLUSH); -+ ii_read_lock_child(inode); -+ if (!(sb->s_flags & SB_POSIXACL)) -+ goto out; -+ -+ bindex = au_ibtop(inode); -+ h_inode = au_h_iptr(inode, bindex); -+ if (unlikely(!h_inode -+ || ((h_inode->i_mode & S_IFMT) -+ != (inode->i_mode & S_IFMT)))) { -+ err = au_busy_or_stale(); -+ acl = ERR_PTR(err); -+ goto out; -+ } -+ -+ /* always topmost only */ -+ acl = get_acl(h_inode, type); -+ if (!IS_ERR_OR_NULL(acl)) -+ set_cached_acl(inode, type, acl); -+ -+out: -+ ii_read_unlock(inode); -+ si_read_unlock(sb); -+ -+ AuTraceErrPtr(acl); -+ return acl; -+} -+ -+int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type) -+{ -+ int err; -+ ssize_t ssz; -+ struct dentry *dentry; -+ struct au_sxattr arg = { -+ .type = AU_ACL_SET, -+ .u.acl_set = { -+ .acl = acl, -+ .type = type -+ }, -+ }; -+ -+ IMustLock(inode); -+ -+ if (inode->i_ino == AUFS_ROOT_INO) -+ dentry = dget(inode->i_sb->s_root); -+ else { -+ dentry = d_find_alias(inode); -+ if (!dentry) -+ dentry = d_find_any_alias(inode); -+ if (!dentry) { -+ pr_warn("cannot handle this inode, " -+ "please report to aufs-users ML\n"); -+ err = -ENOENT; -+ goto out; -+ } -+ } -+ -+ ssz = au_sxattr(dentry, inode, &arg); -+ dput(dentry); -+ err = ssz; -+ if (ssz >= 0) { -+ err = 0; -+ set_cached_acl(inode, type, acl); -+ } -+ -+out: -+ return err; -+} -diff --git a/fs/aufs/procfs.c b/fs/aufs/procfs.c -new file mode 100644 -index 000000000000..582dd486fcd3 ---- /dev/null -+++ b/fs/aufs/procfs.c -@@ -0,0 +1,171 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2010-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * procfs interfaces -+ */ -+ -+#include <linux/proc_fs.h> -+#include "aufs.h" -+ -+static int au_procfs_plm_release(struct inode *inode, struct file *file) -+{ -+ struct au_sbinfo *sbinfo; -+ -+ sbinfo = file->private_data; -+ if (sbinfo) { -+ au_plink_maint_leave(sbinfo); -+ kobject_put(&sbinfo->si_kobj); -+ } -+ -+ return 0; -+} -+ -+static void au_procfs_plm_write_clean(struct file *file) -+{ -+ struct au_sbinfo *sbinfo; -+ -+ sbinfo = file->private_data; -+ if (sbinfo) -+ au_plink_clean(sbinfo->si_sb, /*verbose*/0); -+} -+ -+static int au_procfs_plm_write_si(struct file *file, unsigned long id) -+{ -+ int err; -+ struct super_block *sb; -+ struct au_sbinfo *sbinfo; -+ struct hlist_bl_node *pos; -+ -+ err = -EBUSY; -+ if (unlikely(file->private_data)) -+ goto out; -+ -+ sb = NULL; -+ /* don't use au_sbilist_lock() here */ -+ hlist_bl_lock(&au_sbilist); -+ hlist_bl_for_each_entry(sbinfo, pos, &au_sbilist, si_list) -+ if (id == sysaufs_si_id(sbinfo)) { -+ if (kobject_get_unless_zero(&sbinfo->si_kobj)) -+ sb = sbinfo->si_sb; -+ break; -+ } -+ hlist_bl_unlock(&au_sbilist); -+ -+ err = -EINVAL; -+ if (unlikely(!sb)) -+ goto out; -+ -+ err = au_plink_maint_enter(sb); -+ if (!err) -+ /* keep kobject_get() */ -+ file->private_data = sbinfo; -+ else -+ kobject_put(&sbinfo->si_kobj); -+out: -+ return err; -+} -+ -+/* -+ * Accept a valid "si=xxxx" only. -+ * Once it is accepted successfully, accept "clean" too. -+ */ -+static ssize_t au_procfs_plm_write(struct file *file, const char __user *ubuf, -+ size_t count, loff_t *ppos) -+{ -+ ssize_t err; -+ unsigned long id; -+ /* last newline is allowed */ -+ char buf[3 + sizeof(unsigned long) * 2 + 1]; -+ -+ err = -EACCES; -+ if (unlikely(!capable(CAP_SYS_ADMIN))) -+ goto out; -+ -+ err = -EINVAL; -+ if (unlikely(count > sizeof(buf))) -+ goto out; -+ -+ err = copy_from_user(buf, ubuf, count); -+ if (unlikely(err)) { -+ err = -EFAULT; -+ goto out; -+ } -+ buf[count] = 0; -+ -+ err = -EINVAL; -+ if (!strcmp("clean", buf)) { -+ au_procfs_plm_write_clean(file); -+ goto out_success; -+ } else if (unlikely(strncmp("si=", buf, 3))) -+ goto out; -+ -+ err = kstrtoul(buf + 3, 16, &id); -+ if (unlikely(err)) -+ goto out; -+ -+ err = au_procfs_plm_write_si(file, id); -+ if (unlikely(err)) -+ goto out; -+ -+out_success: -+ err = count; /* success */ -+out: -+ return err; -+} -+ -+static const struct file_operations au_procfs_plm_fop = { -+ .write = au_procfs_plm_write, -+ .release = au_procfs_plm_release, -+ .owner = THIS_MODULE -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+static struct proc_dir_entry *au_procfs_dir; -+ -+void au_procfs_fin(void) -+{ -+ remove_proc_entry(AUFS_PLINK_MAINT_NAME, au_procfs_dir); -+ remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL); -+} -+ -+int __init au_procfs_init(void) -+{ -+ int err; -+ struct proc_dir_entry *entry; -+ -+ err = -ENOMEM; -+ au_procfs_dir = proc_mkdir(AUFS_PLINK_MAINT_DIR, NULL); -+ if (unlikely(!au_procfs_dir)) -+ goto out; -+ -+ entry = proc_create(AUFS_PLINK_MAINT_NAME, S_IFREG | 0200, -+ au_procfs_dir, &au_procfs_plm_fop); -+ if (unlikely(!entry)) -+ goto out_dir; -+ -+ err = 0; -+ goto out; /* success */ -+ -+ -+out_dir: -+ remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL); -+out: -+ return err; -+} -diff --git a/fs/aufs/rdu.c b/fs/aufs/rdu.c -new file mode 100644 -index 000000000000..3805e79627eb ---- /dev/null -+++ b/fs/aufs/rdu.c -@@ -0,0 +1,384 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * readdir in userspace. -+ */ -+ -+#include <linux/compat.h> -+#include <linux/fs_stack.h> -+#include <linux/security.h> -+#include "aufs.h" -+ -+/* bits for struct aufs_rdu.flags */ -+#define AuRdu_CALLED 1 -+#define AuRdu_CONT (1 << 1) -+#define AuRdu_FULL (1 << 2) -+#define au_ftest_rdu(flags, name) ((flags) & AuRdu_##name) -+#define au_fset_rdu(flags, name) \ -+ do { (flags) |= AuRdu_##name; } while (0) -+#define au_fclr_rdu(flags, name) \ -+ do { (flags) &= ~AuRdu_##name; } while (0) -+ -+struct au_rdu_arg { -+ struct dir_context ctx; -+ struct aufs_rdu *rdu; -+ union au_rdu_ent_ul ent; -+ unsigned long end; -+ -+ struct super_block *sb; -+ int err; -+}; -+ -+static int au_rdu_fill(struct dir_context *ctx, const char *name, int nlen, -+ loff_t offset, u64 h_ino, unsigned int d_type) -+{ -+ int err, len; -+ struct au_rdu_arg *arg = container_of(ctx, struct au_rdu_arg, ctx); -+ struct aufs_rdu *rdu = arg->rdu; -+ struct au_rdu_ent ent; -+ -+ err = 0; -+ arg->err = 0; -+ au_fset_rdu(rdu->cookie.flags, CALLED); -+ len = au_rdu_len(nlen); -+ if (arg->ent.ul + len < arg->end) { -+ ent.ino = h_ino; -+ ent.bindex = rdu->cookie.bindex; -+ ent.type = d_type; -+ ent.nlen = nlen; -+ if (unlikely(nlen > AUFS_MAX_NAMELEN)) -+ ent.type = DT_UNKNOWN; -+ -+ /* unnecessary to support mmap_sem since this is a dir */ -+ err = -EFAULT; -+ if (copy_to_user(arg->ent.e, &ent, sizeof(ent))) -+ goto out; -+ if (copy_to_user(arg->ent.e->name, name, nlen)) -+ goto out; -+ /* the terminating NULL */ -+ if (__put_user(0, arg->ent.e->name + nlen)) -+ goto out; -+ err = 0; -+ /* AuDbg("%p, %.*s\n", arg->ent.p, nlen, name); */ -+ arg->ent.ul += len; -+ rdu->rent++; -+ } else { -+ err = -EFAULT; -+ au_fset_rdu(rdu->cookie.flags, FULL); -+ rdu->full = 1; -+ rdu->tail = arg->ent; -+ } -+ -+out: -+ /* AuTraceErr(err); */ -+ return err; -+} -+ -+static int au_rdu_do(struct file *h_file, struct au_rdu_arg *arg) -+{ -+ int err; -+ loff_t offset; -+ struct au_rdu_cookie *cookie = &arg->rdu->cookie; -+ -+ /* we don't have to care (FMODE_32BITHASH | FMODE_64BITHASH) for ext4 */ -+ offset = vfsub_llseek(h_file, cookie->h_pos, SEEK_SET); -+ err = offset; -+ if (unlikely(offset != cookie->h_pos)) -+ goto out; -+ -+ err = 0; -+ do { -+ arg->err = 0; -+ au_fclr_rdu(cookie->flags, CALLED); -+ /* smp_mb(); */ -+ err = vfsub_iterate_dir(h_file, &arg->ctx); -+ if (err >= 0) -+ err = arg->err; -+ } while (!err -+ && au_ftest_rdu(cookie->flags, CALLED) -+ && !au_ftest_rdu(cookie->flags, FULL)); -+ cookie->h_pos = h_file->f_pos; -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+static int au_rdu(struct file *file, struct aufs_rdu *rdu) -+{ -+ int err; -+ aufs_bindex_t bbot; -+ struct au_rdu_arg arg = { -+ .ctx = { -+ .actor = au_rdu_fill -+ } -+ }; -+ struct dentry *dentry; -+ struct inode *inode; -+ struct file *h_file; -+ struct au_rdu_cookie *cookie = &rdu->cookie; -+ -+ /* VERIFY_WRITE */ -+ err = !access_ok(rdu->ent.e, rdu->sz); -+ if (unlikely(err)) { -+ err = -EFAULT; -+ AuTraceErr(err); -+ goto out; -+ } -+ rdu->rent = 0; -+ rdu->tail = rdu->ent; -+ rdu->full = 0; -+ arg.rdu = rdu; -+ arg.ent = rdu->ent; -+ arg.end = arg.ent.ul; -+ arg.end += rdu->sz; -+ -+ err = -ENOTDIR; -+ if (unlikely(!file->f_op->iterate && !file->f_op->iterate_shared)) -+ goto out; -+ -+ err = security_file_permission(file, MAY_READ); -+ AuTraceErr(err); -+ if (unlikely(err)) -+ goto out; -+ -+ dentry = file->f_path.dentry; -+ inode = d_inode(dentry); -+ inode_lock_shared(inode); -+ -+ arg.sb = inode->i_sb; -+ err = si_read_lock(arg.sb, AuLock_FLUSH | AuLock_NOPLM); -+ if (unlikely(err)) -+ goto out_mtx; -+ err = au_alive_dir(dentry); -+ if (unlikely(err)) -+ goto out_si; -+ /* todo: reval? */ -+ fi_read_lock(file); -+ -+ err = -EAGAIN; -+ if (unlikely(au_ftest_rdu(cookie->flags, CONT) -+ && cookie->generation != au_figen(file))) -+ goto out_unlock; -+ -+ err = 0; -+ if (!rdu->blk) { -+ rdu->blk = au_sbi(arg.sb)->si_rdblk; -+ if (!rdu->blk) -+ rdu->blk = au_dir_size(file, /*dentry*/NULL); -+ } -+ bbot = au_fbtop(file); -+ if (cookie->bindex < bbot) -+ cookie->bindex = bbot; -+ bbot = au_fbbot_dir(file); -+ /* AuDbg("b%d, b%d\n", cookie->bindex, bbot); */ -+ for (; !err && cookie->bindex <= bbot; -+ cookie->bindex++, cookie->h_pos = 0) { -+ h_file = au_hf_dir(file, cookie->bindex); -+ if (!h_file) -+ continue; -+ -+ au_fclr_rdu(cookie->flags, FULL); -+ err = au_rdu_do(h_file, &arg); -+ AuTraceErr(err); -+ if (unlikely(au_ftest_rdu(cookie->flags, FULL) || err)) -+ break; -+ } -+ AuDbg("rent %llu\n", rdu->rent); -+ -+ if (!err && !au_ftest_rdu(cookie->flags, CONT)) { -+ rdu->shwh = !!au_opt_test(au_sbi(arg.sb)->si_mntflags, SHWH); -+ au_fset_rdu(cookie->flags, CONT); -+ cookie->generation = au_figen(file); -+ } -+ -+ ii_read_lock_child(inode); -+ fsstack_copy_attr_atime(inode, au_h_iptr(inode, au_ibtop(inode))); -+ ii_read_unlock(inode); -+ -+out_unlock: -+ fi_read_unlock(file); -+out_si: -+ si_read_unlock(arg.sb); -+out_mtx: -+ inode_unlock_shared(inode); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+static int au_rdu_ino(struct file *file, struct aufs_rdu *rdu) -+{ -+ int err; -+ ino_t ino; -+ unsigned long long nent; -+ union au_rdu_ent_ul *u; -+ struct au_rdu_ent ent; -+ struct super_block *sb; -+ -+ err = 0; -+ nent = rdu->nent; -+ u = &rdu->ent; -+ sb = file->f_path.dentry->d_sb; -+ si_read_lock(sb, AuLock_FLUSH); -+ while (nent-- > 0) { -+ /* unnecessary to support mmap_sem since this is a dir */ -+ err = copy_from_user(&ent, u->e, sizeof(ent)); -+ if (!err) -+ /* VERIFY_WRITE */ -+ err = !access_ok(&u->e->ino, sizeof(ino)); -+ if (unlikely(err)) { -+ err = -EFAULT; -+ AuTraceErr(err); -+ break; -+ } -+ -+ /* AuDbg("b%d, i%llu\n", ent.bindex, ent.ino); */ -+ if (!ent.wh) -+ err = au_ino(sb, ent.bindex, ent.ino, ent.type, &ino); -+ else -+ err = au_wh_ino(sb, ent.bindex, ent.ino, ent.type, -+ &ino); -+ if (unlikely(err)) { -+ AuTraceErr(err); -+ break; -+ } -+ -+ err = __put_user(ino, &u->e->ino); -+ if (unlikely(err)) { -+ err = -EFAULT; -+ AuTraceErr(err); -+ break; -+ } -+ u->ul += au_rdu_len(ent.nlen); -+ } -+ si_read_unlock(sb); -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_rdu_verify(struct aufs_rdu *rdu) -+{ -+ AuDbg("rdu{%llu, %p, %u | %u | %llu, %u, %u | " -+ "%llu, b%d, 0x%x, g%u}\n", -+ rdu->sz, rdu->ent.e, rdu->verify[AufsCtlRduV_SZ], -+ rdu->blk, -+ rdu->rent, rdu->shwh, rdu->full, -+ rdu->cookie.h_pos, rdu->cookie.bindex, rdu->cookie.flags, -+ rdu->cookie.generation); -+ -+ if (rdu->verify[AufsCtlRduV_SZ] == sizeof(*rdu)) -+ return 0; -+ -+ AuDbg("%u:%u\n", -+ rdu->verify[AufsCtlRduV_SZ], (unsigned int)sizeof(*rdu)); -+ return -EINVAL; -+} -+ -+long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -+{ -+ long err, e; -+ struct aufs_rdu rdu; -+ void __user *p = (void __user *)arg; -+ -+ err = copy_from_user(&rdu, p, sizeof(rdu)); -+ if (unlikely(err)) { -+ err = -EFAULT; -+ AuTraceErr(err); -+ goto out; -+ } -+ err = au_rdu_verify(&rdu); -+ if (unlikely(err)) -+ goto out; -+ -+ switch (cmd) { -+ case AUFS_CTL_RDU: -+ err = au_rdu(file, &rdu); -+ if (unlikely(err)) -+ break; -+ -+ e = copy_to_user(p, &rdu, sizeof(rdu)); -+ if (unlikely(e)) { -+ err = -EFAULT; -+ AuTraceErr(err); -+ } -+ break; -+ case AUFS_CTL_RDU_INO: -+ err = au_rdu_ino(file, &rdu); -+ break; -+ -+ default: -+ /* err = -ENOTTY; */ -+ err = -EINVAL; -+ } -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+#ifdef CONFIG_COMPAT -+long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -+{ -+ long err, e; -+ struct aufs_rdu rdu; -+ void __user *p = compat_ptr(arg); -+ -+ /* todo: get_user()? */ -+ err = copy_from_user(&rdu, p, sizeof(rdu)); -+ if (unlikely(err)) { -+ err = -EFAULT; -+ AuTraceErr(err); -+ goto out; -+ } -+ rdu.ent.e = compat_ptr(rdu.ent.ul); -+ err = au_rdu_verify(&rdu); -+ if (unlikely(err)) -+ goto out; -+ -+ switch (cmd) { -+ case AUFS_CTL_RDU: -+ err = au_rdu(file, &rdu); -+ if (unlikely(err)) -+ break; -+ -+ rdu.ent.ul = ptr_to_compat(rdu.ent.e); -+ rdu.tail.ul = ptr_to_compat(rdu.tail.e); -+ e = copy_to_user(p, &rdu, sizeof(rdu)); -+ if (unlikely(e)) { -+ err = -EFAULT; -+ AuTraceErr(err); -+ } -+ break; -+ case AUFS_CTL_RDU_INO: -+ err = au_rdu_ino(file, &rdu); -+ break; -+ -+ default: -+ /* err = -ENOTTY; */ -+ err = -EINVAL; -+ } -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+#endif -diff --git a/fs/aufs/rwsem.h b/fs/aufs/rwsem.h -new file mode 100644 -index 000000000000..2f8988fa1bda ---- /dev/null -+++ b/fs/aufs/rwsem.h -@@ -0,0 +1,73 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * simple read-write semaphore wrappers -+ */ -+ -+#ifndef __AUFS_RWSEM_H__ -+#define __AUFS_RWSEM_H__ -+ -+#ifdef __KERNEL__ -+ -+#include "debug.h" -+ -+/* in the future, the name 'au_rwsem' will be totally gone */ -+#define au_rwsem rw_semaphore -+ -+/* to debug easier, do not make them inlined functions */ -+#define AuRwMustNoWaiters(rw) AuDebugOn(rwsem_is_contended(rw)) -+/* rwsem_is_locked() is unusable */ -+#define AuRwMustReadLock(rw) AuDebugOn(!lockdep_recursing(current) \ -+ && debug_locks \ -+ && !lockdep_is_held_type(rw, 1)) -+#define AuRwMustWriteLock(rw) AuDebugOn(!lockdep_recursing(current) \ -+ && debug_locks \ -+ && !lockdep_is_held_type(rw, 0)) -+#define AuRwMustAnyLock(rw) AuDebugOn(!lockdep_recursing(current) \ -+ && debug_locks \ -+ && !lockdep_is_held(rw)) -+#define AuRwDestroy(rw) AuDebugOn(!lockdep_recursing(current) \ -+ && debug_locks \ -+ && lockdep_is_held(rw)) -+ -+#define au_rw_init(rw) init_rwsem(rw) -+ -+#define au_rw_init_wlock(rw) do { \ -+ au_rw_init(rw); \ -+ down_write(rw); \ -+ } while (0) -+ -+#define au_rw_init_wlock_nested(rw, lsc) do { \ -+ au_rw_init(rw); \ -+ down_write_nested(rw, lsc); \ -+ } while (0) -+ -+#define au_rw_read_lock(rw) down_read(rw) -+#define au_rw_read_lock_nested(rw, lsc) down_read_nested(rw, lsc) -+#define au_rw_read_unlock(rw) up_read(rw) -+#define au_rw_dgrade_lock(rw) downgrade_write(rw) -+#define au_rw_write_lock(rw) down_write(rw) -+#define au_rw_write_lock_nested(rw, lsc) down_write_nested(rw, lsc) -+#define au_rw_write_unlock(rw) up_write(rw) -+/* why is not _nested version defined? */ -+#define au_rw_read_trylock(rw) down_read_trylock(rw) -+#define au_rw_write_trylock(rw) down_write_trylock(rw) -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_RWSEM_H__ */ -diff --git a/fs/aufs/sbinfo.c b/fs/aufs/sbinfo.c -new file mode 100644 -index 000000000000..500a920b4ea1 ---- /dev/null -+++ b/fs/aufs/sbinfo.c -@@ -0,0 +1,314 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * superblock private data -+ */ -+ -+#include <linux/iversion.h> -+#include "aufs.h" -+ -+/* -+ * they are necessary regardless sysfs is disabled. -+ */ -+void au_si_free(struct kobject *kobj) -+{ -+ int i; -+ struct au_sbinfo *sbinfo; -+ char *locked __maybe_unused; /* debug only */ -+ -+ sbinfo = container_of(kobj, struct au_sbinfo, si_kobj); -+ for (i = 0; i < AuPlink_NHASH; i++) -+ AuDebugOn(!hlist_bl_empty(sbinfo->si_plink + i)); -+ AuDebugOn(atomic_read(&sbinfo->si_nowait.nw_len)); -+ -+ AuLCntZero(au_lcnt_read(&sbinfo->si_ninodes, /*do_rev*/0)); -+ au_lcnt_fin(&sbinfo->si_ninodes, /*do_sync*/0); -+ AuLCntZero(au_lcnt_read(&sbinfo->si_nfiles, /*do_rev*/0)); -+ au_lcnt_fin(&sbinfo->si_nfiles, /*do_sync*/0); -+ -+ dbgaufs_si_fin(sbinfo); -+ au_rw_write_lock(&sbinfo->si_rwsem); -+ au_br_free(sbinfo); -+ au_rw_write_unlock(&sbinfo->si_rwsem); -+ -+ au_kfree_try_rcu(sbinfo->si_branch); -+ mutex_destroy(&sbinfo->si_xib_mtx); -+ AuRwDestroy(&sbinfo->si_rwsem); -+ -+ au_lcnt_wait_for_fin(&sbinfo->si_ninodes); -+ /* si_nfiles is waited too */ -+ au_kfree_rcu(sbinfo); -+} -+ -+int au_si_alloc(struct super_block *sb) -+{ -+ int err, i; -+ struct au_sbinfo *sbinfo; -+ -+ err = -ENOMEM; -+ sbinfo = kzalloc(sizeof(*sbinfo), GFP_NOFS); -+ if (unlikely(!sbinfo)) -+ goto out; -+ -+ /* will be reallocated separately */ -+ sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_NOFS); -+ if (unlikely(!sbinfo->si_branch)) -+ goto out_sbinfo; -+ -+ err = sysaufs_si_init(sbinfo); -+ if (!err) { -+ dbgaufs_si_null(sbinfo); -+ err = dbgaufs_si_init(sbinfo); -+ if (unlikely(err)) -+ kobject_put(&sbinfo->si_kobj); -+ } -+ if (unlikely(err)) -+ goto out_br; -+ -+ au_nwt_init(&sbinfo->si_nowait); -+ au_rw_init_wlock(&sbinfo->si_rwsem); -+ -+ au_lcnt_init(&sbinfo->si_ninodes, /*release*/NULL); -+ au_lcnt_init(&sbinfo->si_nfiles, /*release*/NULL); -+ -+ sbinfo->si_bbot = -1; -+ sbinfo->si_last_br_id = AUFS_BRANCH_MAX / 2; -+ -+ sbinfo->si_wbr_copyup = AuWbrCopyup_Def; -+ sbinfo->si_wbr_create = AuWbrCreate_Def; -+ sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + sbinfo->si_wbr_copyup; -+ sbinfo->si_wbr_create_ops = au_wbr_create_ops + sbinfo->si_wbr_create; -+ -+ au_fhsm_init(sbinfo); -+ -+ sbinfo->si_mntflags = au_opts_plink(AuOpt_Def); -+ -+ sbinfo->si_xino_jiffy = jiffies; -+ sbinfo->si_xino_expire -+ = msecs_to_jiffies(AUFS_XINO_DEF_SEC * MSEC_PER_SEC); -+ mutex_init(&sbinfo->si_xib_mtx); -+ /* leave si_xib_last_pindex and si_xib_next_bit */ -+ -+ INIT_HLIST_BL_HEAD(&sbinfo->si_aopen); -+ -+ sbinfo->si_rdcache = msecs_to_jiffies(AUFS_RDCACHE_DEF * MSEC_PER_SEC); -+ sbinfo->si_rdblk = AUFS_RDBLK_DEF; -+ sbinfo->si_rdhash = AUFS_RDHASH_DEF; -+ sbinfo->si_dirwh = AUFS_DIRWH_DEF; -+ -+ for (i = 0; i < AuPlink_NHASH; i++) -+ INIT_HLIST_BL_HEAD(sbinfo->si_plink + i); -+ init_waitqueue_head(&sbinfo->si_plink_wq); -+ spin_lock_init(&sbinfo->si_plink_maint_lock); -+ -+ INIT_HLIST_BL_HEAD(&sbinfo->si_files); -+ -+ /* with getattr by default */ -+ sbinfo->si_iop_array = aufs_iop; -+ -+ /* leave other members for sysaufs and si_mnt. */ -+ sbinfo->si_sb = sb; -+ sb->s_fs_info = sbinfo; -+ si_pid_set(sb); -+ return 0; /* success */ -+ -+out_br: -+ au_kfree_try_rcu(sbinfo->si_branch); -+out_sbinfo: -+ au_kfree_rcu(sbinfo); -+out: -+ return err; -+} -+ -+int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr, int may_shrink) -+{ -+ int err, sz; -+ struct au_branch **brp; -+ -+ AuRwMustWriteLock(&sbinfo->si_rwsem); -+ -+ err = -ENOMEM; -+ sz = sizeof(*brp) * (sbinfo->si_bbot + 1); -+ if (unlikely(!sz)) -+ sz = sizeof(*brp); -+ brp = au_kzrealloc(sbinfo->si_branch, sz, sizeof(*brp) * nbr, GFP_NOFS, -+ may_shrink); -+ if (brp) { -+ sbinfo->si_branch = brp; -+ err = 0; -+ } -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+unsigned int au_sigen_inc(struct super_block *sb) -+{ -+ unsigned int gen; -+ struct inode *inode; -+ -+ SiMustWriteLock(sb); -+ -+ gen = ++au_sbi(sb)->si_generation; -+ au_update_digen(sb->s_root); -+ inode = d_inode(sb->s_root); -+ au_update_iigen(inode, /*half*/0); -+ inode_inc_iversion(inode); -+ return gen; -+} -+ -+aufs_bindex_t au_new_br_id(struct super_block *sb) -+{ -+ aufs_bindex_t br_id; -+ int i; -+ struct au_sbinfo *sbinfo; -+ -+ SiMustWriteLock(sb); -+ -+ sbinfo = au_sbi(sb); -+ for (i = 0; i <= AUFS_BRANCH_MAX; i++) { -+ br_id = ++sbinfo->si_last_br_id; -+ AuDebugOn(br_id < 0); -+ if (br_id && au_br_index(sb, br_id) < 0) -+ return br_id; -+ } -+ -+ return -1; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* it is ok that new 'nwt' tasks are appended while we are sleeping */ -+int si_read_lock(struct super_block *sb, int flags) -+{ -+ int err; -+ -+ err = 0; -+ if (au_ftest_lock(flags, FLUSH)) -+ au_nwt_flush(&au_sbi(sb)->si_nowait); -+ -+ si_noflush_read_lock(sb); -+ err = au_plink_maint(sb, flags); -+ if (unlikely(err)) -+ si_read_unlock(sb); -+ -+ return err; -+} -+ -+int si_write_lock(struct super_block *sb, int flags) -+{ -+ int err; -+ -+ if (au_ftest_lock(flags, FLUSH)) -+ au_nwt_flush(&au_sbi(sb)->si_nowait); -+ -+ si_noflush_write_lock(sb); -+ err = au_plink_maint(sb, flags); -+ if (unlikely(err)) -+ si_write_unlock(sb); -+ -+ return err; -+} -+ -+/* dentry and super_block lock. call at entry point */ -+int aufs_read_lock(struct dentry *dentry, int flags) -+{ -+ int err; -+ struct super_block *sb; -+ -+ sb = dentry->d_sb; -+ err = si_read_lock(sb, flags); -+ if (unlikely(err)) -+ goto out; -+ -+ if (au_ftest_lock(flags, DW)) -+ di_write_lock_child(dentry); -+ else -+ di_read_lock_child(dentry, flags); -+ -+ if (au_ftest_lock(flags, GEN)) { -+ err = au_digen_test(dentry, au_sigen(sb)); -+ if (!au_opt_test(au_mntflags(sb), UDBA_NONE)) -+ AuDebugOn(!err && au_dbrange_test(dentry)); -+ else if (!err) -+ err = au_dbrange_test(dentry); -+ if (unlikely(err)) -+ aufs_read_unlock(dentry, flags); -+ } -+ -+out: -+ return err; -+} -+ -+void aufs_read_unlock(struct dentry *dentry, int flags) -+{ -+ if (au_ftest_lock(flags, DW)) -+ di_write_unlock(dentry); -+ else -+ di_read_unlock(dentry, flags); -+ si_read_unlock(dentry->d_sb); -+} -+ -+void aufs_write_lock(struct dentry *dentry) -+{ -+ si_write_lock(dentry->d_sb, AuLock_FLUSH | AuLock_NOPLMW); -+ di_write_lock_child(dentry); -+} -+ -+void aufs_write_unlock(struct dentry *dentry) -+{ -+ di_write_unlock(dentry); -+ si_write_unlock(dentry->d_sb); -+} -+ -+int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags) -+{ -+ int err; -+ unsigned int sigen; -+ struct super_block *sb; -+ -+ sb = d1->d_sb; -+ err = si_read_lock(sb, flags); -+ if (unlikely(err)) -+ goto out; -+ -+ di_write_lock2_child(d1, d2, au_ftest_lock(flags, DIRS)); -+ -+ if (au_ftest_lock(flags, GEN)) { -+ sigen = au_sigen(sb); -+ err = au_digen_test(d1, sigen); -+ AuDebugOn(!err && au_dbrange_test(d1)); -+ if (!err) { -+ err = au_digen_test(d2, sigen); -+ AuDebugOn(!err && au_dbrange_test(d2)); -+ } -+ if (unlikely(err)) -+ aufs_read_and_write_unlock2(d1, d2); -+ } -+ -+out: -+ return err; -+} -+ -+void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2) -+{ -+ di_write_unlock2(d1, d2); -+ si_read_unlock(d1->d_sb); -+} -diff --git a/fs/aufs/super.c b/fs/aufs/super.c -new file mode 100644 -index 000000000000..44ee4685b218 ---- /dev/null -+++ b/fs/aufs/super.c -@@ -0,0 +1,1047 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * mount and super_block operations -+ */ -+ -+#include <linux/iversion.h> -+#include <linux/mm.h> -+#include <linux/seq_file.h> -+#include <linux/statfs.h> -+#include <linux/vmalloc.h> -+#include "aufs.h" -+ -+/* -+ * super_operations -+ */ -+static struct inode *aufs_alloc_inode(struct super_block *sb __maybe_unused) -+{ -+ struct au_icntnr *c; -+ -+ c = au_cache_alloc_icntnr(); -+ if (c) { -+ au_icntnr_init(c); -+ inode_set_iversion(&c->vfs_inode, 1); /* sigen(sb); */ -+ c->iinfo.ii_hinode = NULL; -+ return &c->vfs_inode; -+ } -+ return NULL; -+} -+ -+static void aufs_destroy_inode(struct inode *inode) -+{ -+ if (!au_is_bad_inode(inode)) -+ au_iinfo_fin(inode); -+} -+ -+static void aufs_free_inode(struct inode *inode) -+{ -+ au_cache_free_icntnr(container_of(inode, struct au_icntnr, vfs_inode)); -+} -+ -+struct inode *au_iget_locked(struct super_block *sb, ino_t ino) -+{ -+ struct inode *inode; -+ int err; -+ -+ inode = iget_locked(sb, ino); -+ if (unlikely(!inode)) { -+ inode = ERR_PTR(-ENOMEM); -+ goto out; -+ } -+ if (!(inode->i_state & I_NEW)) -+ goto out; -+ -+ err = au_xigen_new(inode); -+ if (!err) -+ err = au_iinfo_init(inode); -+ if (!err) -+ inode_inc_iversion(inode); -+ else { -+ iget_failed(inode); -+ inode = ERR_PTR(err); -+ } -+ -+out: -+ /* never return NULL */ -+ AuDebugOn(!inode); -+ AuTraceErrPtr(inode); -+ return inode; -+} -+ -+/* lock free root dinfo */ -+static int au_show_brs(struct seq_file *seq, struct super_block *sb) -+{ -+ int err; -+ aufs_bindex_t bindex, bbot; -+ struct path path; -+ struct au_hdentry *hdp; -+ struct au_branch *br; -+ au_br_perm_str_t perm; -+ -+ err = 0; -+ bbot = au_sbbot(sb); -+ bindex = 0; -+ hdp = au_hdentry(au_di(sb->s_root), bindex); -+ for (; !err && bindex <= bbot; bindex++, hdp++) { -+ br = au_sbr(sb, bindex); -+ path.mnt = au_br_mnt(br); -+ path.dentry = hdp->hd_dentry; -+ err = au_seq_path(seq, &path); -+ if (!err) { -+ au_optstr_br_perm(&perm, br->br_perm); -+ seq_printf(seq, "=%s", perm.a); -+ if (bindex != bbot) -+ seq_putc(seq, ':'); -+ } -+ } -+ if (unlikely(err || seq_has_overflowed(seq))) -+ err = -E2BIG; -+ -+ return err; -+} -+ -+static void au_gen_fmt(char *fmt, int len __maybe_unused, const char *pat, -+ const char *append) -+{ -+ char *p; -+ -+ p = fmt; -+ while (*pat != ':') -+ *p++ = *pat++; -+ *p++ = *pat++; -+ strcpy(p, append); -+ AuDebugOn(strlen(fmt) >= len); -+} -+ -+static void au_show_wbr_create(struct seq_file *m, int v, -+ struct au_sbinfo *sbinfo) -+{ -+ const char *pat; -+ char fmt[32]; -+ struct au_wbr_mfs *mfs; -+ -+ AuRwMustAnyLock(&sbinfo->si_rwsem); -+ -+ seq_puts(m, ",create="); -+ pat = au_optstr_wbr_create(v); -+ mfs = &sbinfo->si_wbr_mfs; -+ switch (v) { -+ case AuWbrCreate_TDP: -+ case AuWbrCreate_RR: -+ case AuWbrCreate_MFS: -+ case AuWbrCreate_PMFS: -+ seq_puts(m, pat); -+ break; -+ case AuWbrCreate_MFSRR: -+ case AuWbrCreate_TDMFS: -+ case AuWbrCreate_PMFSRR: -+ au_gen_fmt(fmt, sizeof(fmt), pat, "%llu"); -+ seq_printf(m, fmt, mfs->mfsrr_watermark); -+ break; -+ case AuWbrCreate_MFSV: -+ case AuWbrCreate_PMFSV: -+ au_gen_fmt(fmt, sizeof(fmt), pat, "%lu"); -+ seq_printf(m, fmt, -+ jiffies_to_msecs(mfs->mfs_expire) -+ / MSEC_PER_SEC); -+ break; -+ case AuWbrCreate_MFSRRV: -+ case AuWbrCreate_TDMFSV: -+ case AuWbrCreate_PMFSRRV: -+ au_gen_fmt(fmt, sizeof(fmt), pat, "%llu:%lu"); -+ seq_printf(m, fmt, mfs->mfsrr_watermark, -+ jiffies_to_msecs(mfs->mfs_expire) / MSEC_PER_SEC); -+ break; -+ default: -+ BUG(); -+ } -+} -+ -+static int au_show_xino(struct seq_file *seq, struct super_block *sb) -+{ -+#ifdef CONFIG_SYSFS -+ return 0; -+#else -+ int err; -+ const int len = sizeof(AUFS_XINO_FNAME) - 1; -+ aufs_bindex_t bindex, brid; -+ struct qstr *name; -+ struct file *f; -+ struct dentry *d, *h_root; -+ struct au_branch *br; -+ -+ AuRwMustAnyLock(&sbinfo->si_rwsem); -+ -+ err = 0; -+ f = au_sbi(sb)->si_xib; -+ if (!f) -+ goto out; -+ -+ /* stop printing the default xino path on the first writable branch */ -+ h_root = NULL; -+ bindex = au_xi_root(sb, f->f_path.dentry); -+ if (bindex >= 0) { -+ br = au_sbr_sb(sb, bindex); -+ h_root = au_br_dentry(br); -+ } -+ -+ d = f->f_path.dentry; -+ name = &d->d_name; -+ /* safe ->d_parent because the file is unlinked */ -+ if (d->d_parent == h_root -+ && name->len == len -+ && !memcmp(name->name, AUFS_XINO_FNAME, len)) -+ goto out; -+ -+ seq_puts(seq, ",xino="); -+ err = au_xino_path(seq, f); -+ -+out: -+ return err; -+#endif -+} -+ -+/* seq_file will re-call me in case of too long string */ -+static int aufs_show_options(struct seq_file *m, struct dentry *dentry) -+{ -+ int err; -+ unsigned int mnt_flags, v; -+ struct super_block *sb; -+ struct au_sbinfo *sbinfo; -+ -+#define AuBool(name, str) do { \ -+ v = au_opt_test(mnt_flags, name); \ -+ if (v != au_opt_test(AuOpt_Def, name)) \ -+ seq_printf(m, ",%s" #str, v ? "" : "no"); \ -+} while (0) -+ -+#define AuStr(name, str) do { \ -+ v = mnt_flags & AuOptMask_##name; \ -+ if (v != (AuOpt_Def & AuOptMask_##name)) \ -+ seq_printf(m, "," #str "=%s", au_optstr_##str(v)); \ -+} while (0) -+ -+#define AuUInt(name, str, val) do { \ -+ if (val != AUFS_##name##_DEF) \ -+ seq_printf(m, "," #str "=%u", val); \ -+} while (0) -+ -+ sb = dentry->d_sb; -+ if (sb->s_flags & SB_POSIXACL) -+ seq_puts(m, ",acl"); -+#if 0 -+ if (sb->s_flags & SB_I_VERSION) -+ seq_puts(m, ",i_version"); -+#endif -+ -+ /* lock free root dinfo */ -+ si_noflush_read_lock(sb); -+ sbinfo = au_sbi(sb); -+ seq_printf(m, ",si=%lx", sysaufs_si_id(sbinfo)); -+ -+ mnt_flags = au_mntflags(sb); -+ if (au_opt_test(mnt_flags, XINO)) { -+ err = au_show_xino(m, sb); -+ if (unlikely(err)) -+ goto out; -+ } else -+ seq_puts(m, ",noxino"); -+ -+ AuBool(TRUNC_XINO, trunc_xino); -+ AuStr(UDBA, udba); -+ AuBool(SHWH, shwh); -+ AuBool(PLINK, plink); -+ AuBool(DIO, dio); -+ AuBool(DIRPERM1, dirperm1); -+ -+ v = sbinfo->si_wbr_create; -+ if (v != AuWbrCreate_Def) -+ au_show_wbr_create(m, v, sbinfo); -+ -+ v = sbinfo->si_wbr_copyup; -+ if (v != AuWbrCopyup_Def) -+ seq_printf(m, ",cpup=%s", au_optstr_wbr_copyup(v)); -+ -+ v = au_opt_test(mnt_flags, ALWAYS_DIROPQ); -+ if (v != au_opt_test(AuOpt_Def, ALWAYS_DIROPQ)) -+ seq_printf(m, ",diropq=%c", v ? 'a' : 'w'); -+ -+ AuUInt(DIRWH, dirwh, sbinfo->si_dirwh); -+ -+ v = jiffies_to_msecs(sbinfo->si_rdcache) / MSEC_PER_SEC; -+ AuUInt(RDCACHE, rdcache, v); -+ -+ AuUInt(RDBLK, rdblk, sbinfo->si_rdblk); -+ AuUInt(RDHASH, rdhash, sbinfo->si_rdhash); -+ -+ au_fhsm_show(m, sbinfo); -+ -+ AuBool(DIRREN, dirren); -+ AuBool(SUM, sum); -+ /* AuBool(SUM_W, wsum); */ -+ AuBool(WARN_PERM, warn_perm); -+ AuBool(VERBOSE, verbose); -+ -+out: -+ /* be sure to print "br:" last */ -+ if (!sysaufs_brs) { -+ seq_puts(m, ",br:"); -+ au_show_brs(m, sb); -+ } -+ si_read_unlock(sb); -+ return 0; -+ -+#undef AuBool -+#undef AuStr -+#undef AuUInt -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* sum mode which returns the summation for statfs(2) */ -+ -+static u64 au_add_till_max(u64 a, u64 b) -+{ -+ u64 old; -+ -+ old = a; -+ a += b; -+ if (old <= a) -+ return a; -+ return ULLONG_MAX; -+} -+ -+static u64 au_mul_till_max(u64 a, long mul) -+{ -+ u64 old; -+ -+ old = a; -+ a *= mul; -+ if (old <= a) -+ return a; -+ return ULLONG_MAX; -+} -+ -+static int au_statfs_sum(struct super_block *sb, struct kstatfs *buf) -+{ -+ int err; -+ long bsize, factor; -+ u64 blocks, bfree, bavail, files, ffree; -+ aufs_bindex_t bbot, bindex, i; -+ unsigned char shared; -+ struct path h_path; -+ struct super_block *h_sb; -+ -+ err = 0; -+ bsize = LONG_MAX; -+ files = 0; -+ ffree = 0; -+ blocks = 0; -+ bfree = 0; -+ bavail = 0; -+ bbot = au_sbbot(sb); -+ for (bindex = 0; bindex <= bbot; bindex++) { -+ h_path.mnt = au_sbr_mnt(sb, bindex); -+ h_sb = h_path.mnt->mnt_sb; -+ shared = 0; -+ for (i = 0; !shared && i < bindex; i++) -+ shared = (au_sbr_sb(sb, i) == h_sb); -+ if (shared) -+ continue; -+ -+ /* sb->s_root for NFS is unreliable */ -+ h_path.dentry = h_path.mnt->mnt_root; -+ err = vfs_statfs(&h_path, buf); -+ if (unlikely(err)) -+ goto out; -+ -+ if (bsize > buf->f_bsize) { -+ /* -+ * we will reduce bsize, so we have to expand blocks -+ * etc. to match them again -+ */ -+ factor = (bsize / buf->f_bsize); -+ blocks = au_mul_till_max(blocks, factor); -+ bfree = au_mul_till_max(bfree, factor); -+ bavail = au_mul_till_max(bavail, factor); -+ bsize = buf->f_bsize; -+ } -+ -+ factor = (buf->f_bsize / bsize); -+ blocks = au_add_till_max(blocks, -+ au_mul_till_max(buf->f_blocks, factor)); -+ bfree = au_add_till_max(bfree, -+ au_mul_till_max(buf->f_bfree, factor)); -+ bavail = au_add_till_max(bavail, -+ au_mul_till_max(buf->f_bavail, factor)); -+ files = au_add_till_max(files, buf->f_files); -+ ffree = au_add_till_max(ffree, buf->f_ffree); -+ } -+ -+ buf->f_bsize = bsize; -+ buf->f_blocks = blocks; -+ buf->f_bfree = bfree; -+ buf->f_bavail = bavail; -+ buf->f_files = files; -+ buf->f_ffree = ffree; -+ buf->f_frsize = 0; -+ -+out: -+ return err; -+} -+ -+static int aufs_statfs(struct dentry *dentry, struct kstatfs *buf) -+{ -+ int err; -+ struct path h_path; -+ struct super_block *sb; -+ -+ /* lock free root dinfo */ -+ sb = dentry->d_sb; -+ si_noflush_read_lock(sb); -+ if (!au_opt_test(au_mntflags(sb), SUM)) { -+ /* sb->s_root for NFS is unreliable */ -+ h_path.mnt = au_sbr_mnt(sb, 0); -+ h_path.dentry = h_path.mnt->mnt_root; -+ err = vfs_statfs(&h_path, buf); -+ } else -+ err = au_statfs_sum(sb, buf); -+ si_read_unlock(sb); -+ -+ if (!err) { -+ buf->f_type = AUFS_SUPER_MAGIC; -+ buf->f_namelen = AUFS_MAX_NAMELEN; -+ memset(&buf->f_fsid, 0, sizeof(buf->f_fsid)); -+ } -+ /* buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; */ -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int aufs_sync_fs(struct super_block *sb, int wait) -+{ -+ int err, e; -+ aufs_bindex_t bbot, bindex; -+ struct au_branch *br; -+ struct super_block *h_sb; -+ -+ err = 0; -+ si_noflush_read_lock(sb); -+ bbot = au_sbbot(sb); -+ for (bindex = 0; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ if (!au_br_writable(br->br_perm)) -+ continue; -+ -+ h_sb = au_sbr_sb(sb, bindex); -+ e = vfsub_sync_filesystem(h_sb, wait); -+ if (unlikely(e && !err)) -+ err = e; -+ /* go on even if an error happens */ -+ } -+ si_read_unlock(sb); -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* final actions when unmounting a file system */ -+static void aufs_put_super(struct super_block *sb) -+{ -+ struct au_sbinfo *sbinfo; -+ -+ sbinfo = au_sbi(sb); -+ if (sbinfo) -+ kobject_put(&sbinfo->si_kobj); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, -+ struct super_block *sb, void *arg) -+{ -+ void *array; -+ unsigned long long n, sz; -+ -+ array = NULL; -+ n = 0; -+ if (!*hint) -+ goto out; -+ -+ if (*hint > ULLONG_MAX / sizeof(array)) { -+ array = ERR_PTR(-EMFILE); -+ pr_err("hint %llu\n", *hint); -+ goto out; -+ } -+ -+ sz = sizeof(array) * *hint; -+ array = kzalloc(sz, GFP_NOFS); -+ if (unlikely(!array)) -+ array = vzalloc(sz); -+ if (unlikely(!array)) { -+ array = ERR_PTR(-ENOMEM); -+ goto out; -+ } -+ -+ n = cb(sb, array, *hint, arg); -+ AuDebugOn(n > *hint); -+ -+out: -+ *hint = n; -+ return array; -+} -+ -+static unsigned long long au_iarray_cb(struct super_block *sb, void *a, -+ unsigned long long max __maybe_unused, -+ void *arg) -+{ -+ unsigned long long n; -+ struct inode **p, *inode; -+ struct list_head *head; -+ -+ n = 0; -+ p = a; -+ head = arg; -+ spin_lock(&sb->s_inode_list_lock); -+ list_for_each_entry(inode, head, i_sb_list) { -+ if (!au_is_bad_inode(inode) -+ && au_ii(inode)->ii_btop >= 0) { -+ spin_lock(&inode->i_lock); -+ if (atomic_read(&inode->i_count)) { -+ au_igrab(inode); -+ *p++ = inode; -+ n++; -+ AuDebugOn(n > max); -+ } -+ spin_unlock(&inode->i_lock); -+ } -+ } -+ spin_unlock(&sb->s_inode_list_lock); -+ -+ return n; -+} -+ -+struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max) -+{ -+ struct au_sbinfo *sbi; -+ -+ sbi = au_sbi(sb); -+ *max = au_lcnt_read(&sbi->si_ninodes, /*do_rev*/1); -+ return au_array_alloc(max, au_iarray_cb, sb, &sb->s_inodes); -+} -+ -+void au_iarray_free(struct inode **a, unsigned long long max) -+{ -+ unsigned long long ull; -+ -+ for (ull = 0; ull < max; ull++) -+ iput(a[ull]); -+ kvfree(a); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * refresh dentry and inode at remount time. -+ */ -+/* todo: consolidate with simple_reval_dpath() and au_reval_for_attr() */ -+static int au_do_refresh(struct dentry *dentry, unsigned int dir_flags, -+ struct dentry *parent) -+{ -+ int err; -+ -+ di_write_lock_child(dentry); -+ di_read_lock_parent(parent, AuLock_IR); -+ err = au_refresh_dentry(dentry, parent); -+ if (!err && dir_flags) -+ au_hn_reset(d_inode(dentry), dir_flags); -+ di_read_unlock(parent, AuLock_IR); -+ di_write_unlock(dentry); -+ -+ return err; -+} -+ -+static int au_do_refresh_d(struct dentry *dentry, unsigned int sigen, -+ struct au_sbinfo *sbinfo, -+ const unsigned int dir_flags, unsigned int do_idop) -+{ -+ int err; -+ struct dentry *parent; -+ -+ err = 0; -+ parent = dget_parent(dentry); -+ if (!au_digen_test(parent, sigen) && au_digen_test(dentry, sigen)) { -+ if (d_really_is_positive(dentry)) { -+ if (!d_is_dir(dentry)) -+ err = au_do_refresh(dentry, /*dir_flags*/0, -+ parent); -+ else { -+ err = au_do_refresh(dentry, dir_flags, parent); -+ if (unlikely(err)) -+ au_fset_si(sbinfo, FAILED_REFRESH_DIR); -+ } -+ } else -+ err = au_do_refresh(dentry, /*dir_flags*/0, parent); -+ AuDbgDentry(dentry); -+ } -+ dput(parent); -+ -+ if (!err) { -+ if (do_idop) -+ au_refresh_dop(dentry, /*force_reval*/0); -+ } else -+ au_refresh_dop(dentry, /*force_reval*/1); -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+static int au_refresh_d(struct super_block *sb, unsigned int do_idop) -+{ -+ int err, i, j, ndentry, e; -+ unsigned int sigen; -+ struct au_dcsub_pages dpages; -+ struct au_dpage *dpage; -+ struct dentry **dentries, *d; -+ struct au_sbinfo *sbinfo; -+ struct dentry *root = sb->s_root; -+ const unsigned int dir_flags = au_hi_flags(d_inode(root), /*isdir*/1); -+ -+ if (do_idop) -+ au_refresh_dop(root, /*force_reval*/0); -+ -+ err = au_dpages_init(&dpages, GFP_NOFS); -+ if (unlikely(err)) -+ goto out; -+ err = au_dcsub_pages(&dpages, root, NULL, NULL); -+ if (unlikely(err)) -+ goto out_dpages; -+ -+ sigen = au_sigen(sb); -+ sbinfo = au_sbi(sb); -+ for (i = 0; i < dpages.ndpage; i++) { -+ dpage = dpages.dpages + i; -+ dentries = dpage->dentries; -+ ndentry = dpage->ndentry; -+ for (j = 0; j < ndentry; j++) { -+ d = dentries[j]; -+ e = au_do_refresh_d(d, sigen, sbinfo, dir_flags, -+ do_idop); -+ if (unlikely(e && !err)) -+ err = e; -+ /* go on even err */ -+ } -+ } -+ -+out_dpages: -+ au_dpages_free(&dpages); -+out: -+ return err; -+} -+ -+static int au_refresh_i(struct super_block *sb, unsigned int do_idop) -+{ -+ int err, e; -+ unsigned int sigen; -+ unsigned long long max, ull; -+ struct inode *inode, **array; -+ -+ array = au_iarray_alloc(sb, &max); -+ err = PTR_ERR(array); -+ if (IS_ERR(array)) -+ goto out; -+ -+ err = 0; -+ sigen = au_sigen(sb); -+ for (ull = 0; ull < max; ull++) { -+ inode = array[ull]; -+ if (unlikely(!inode)) -+ break; -+ -+ e = 0; -+ ii_write_lock_child(inode); -+ if (au_iigen(inode, NULL) != sigen) { -+ e = au_refresh_hinode_self(inode); -+ if (unlikely(e)) { -+ au_refresh_iop(inode, /*force_getattr*/1); -+ pr_err("error %d, i%lu\n", e, inode->i_ino); -+ if (!err) -+ err = e; -+ /* go on even if err */ -+ } -+ } -+ if (!e && do_idop) -+ au_refresh_iop(inode, /*force_getattr*/0); -+ ii_write_unlock(inode); -+ } -+ -+ au_iarray_free(array, max); -+ -+out: -+ return err; -+} -+ -+static void au_remount_refresh(struct super_block *sb, unsigned int do_idop) -+{ -+ int err, e; -+ unsigned int udba; -+ aufs_bindex_t bindex, bbot; -+ struct dentry *root; -+ struct inode *inode; -+ struct au_branch *br; -+ struct au_sbinfo *sbi; -+ -+ au_sigen_inc(sb); -+ sbi = au_sbi(sb); -+ au_fclr_si(sbi, FAILED_REFRESH_DIR); -+ -+ root = sb->s_root; -+ DiMustNoWaiters(root); -+ inode = d_inode(root); -+ IiMustNoWaiters(inode); -+ -+ udba = au_opt_udba(sb); -+ bbot = au_sbbot(sb); -+ for (bindex = 0; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ err = au_hnotify_reset_br(udba, br, br->br_perm); -+ if (unlikely(err)) -+ AuIOErr("hnotify failed on br %d, %d, ignored\n", -+ bindex, err); -+ /* go on even if err */ -+ } -+ au_hn_reset(inode, au_hi_flags(inode, /*isdir*/1)); -+ -+ if (do_idop) { -+ if (au_ftest_si(sbi, NO_DREVAL)) { -+ AuDebugOn(sb->s_d_op == &aufs_dop_noreval); -+ sb->s_d_op = &aufs_dop_noreval; -+ AuDebugOn(sbi->si_iop_array == aufs_iop_nogetattr); -+ sbi->si_iop_array = aufs_iop_nogetattr; -+ } else { -+ AuDebugOn(sb->s_d_op == &aufs_dop); -+ sb->s_d_op = &aufs_dop; -+ AuDebugOn(sbi->si_iop_array == aufs_iop); -+ sbi->si_iop_array = aufs_iop; -+ } -+ pr_info("reset to %ps and %ps\n", -+ sb->s_d_op, sbi->si_iop_array); -+ } -+ -+ di_write_unlock(root); -+ err = au_refresh_d(sb, do_idop); -+ e = au_refresh_i(sb, do_idop); -+ if (unlikely(e && !err)) -+ err = e; -+ /* aufs_write_lock() calls ..._child() */ -+ di_write_lock_child(root); -+ -+ au_cpup_attr_all(inode, /*force*/1); -+ -+ if (unlikely(err)) -+ AuIOErr("refresh failed, ignored, %d\n", err); -+} -+ -+/* stop extra interpretation of errno in mount(8), and strange error messages */ -+static int cvt_err(int err) -+{ -+ AuTraceErr(err); -+ -+ switch (err) { -+ case -ENOENT: -+ case -ENOTDIR: -+ case -EEXIST: -+ case -EIO: -+ err = -EINVAL; -+ } -+ return err; -+} -+ -+static int aufs_remount_fs(struct super_block *sb, int *flags, char *data) -+{ -+ int err, do_dx; -+ unsigned int mntflags; -+ struct au_opts opts = { -+ .opt = NULL -+ }; -+ struct dentry *root; -+ struct inode *inode; -+ struct au_sbinfo *sbinfo; -+ -+ err = 0; -+ root = sb->s_root; -+ if (!data || !*data) { -+ err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM); -+ if (!err) { -+ di_write_lock_child(root); -+ err = au_opts_verify(sb, *flags, /*pending*/0); -+ aufs_write_unlock(root); -+ } -+ goto out; -+ } -+ -+ err = -ENOMEM; -+ opts.opt = (void *)__get_free_page(GFP_NOFS); -+ if (unlikely(!opts.opt)) -+ goto out; -+ opts.max_opt = PAGE_SIZE / sizeof(*opts.opt); -+ opts.flags = AuOpts_REMOUNT; -+ opts.sb_flags = *flags; -+ -+ /* parse it before aufs lock */ -+ err = au_opts_parse(sb, data, &opts); -+ if (unlikely(err)) -+ goto out_opts; -+ -+ sbinfo = au_sbi(sb); -+ inode = d_inode(root); -+ inode_lock(inode); -+ err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM); -+ if (unlikely(err)) -+ goto out_mtx; -+ di_write_lock_child(root); -+ -+ /* au_opts_remount() may return an error */ -+ err = au_opts_remount(sb, &opts); -+ au_opts_free(&opts); -+ -+ if (au_ftest_opts(opts.flags, REFRESH)) -+ au_remount_refresh(sb, au_ftest_opts(opts.flags, REFRESH_IDOP)); -+ -+ if (au_ftest_opts(opts.flags, REFRESH_DYAOP)) { -+ mntflags = au_mntflags(sb); -+ do_dx = !!au_opt_test(mntflags, DIO); -+ au_dy_arefresh(do_dx); -+ } -+ -+ au_fhsm_wrote_all(sb, /*force*/1); /* ?? */ -+ aufs_write_unlock(root); -+ -+out_mtx: -+ inode_unlock(inode); -+out_opts: -+ free_page((unsigned long)opts.opt); -+out: -+ err = cvt_err(err); -+ AuTraceErr(err); -+ return err; -+} -+ -+static const struct super_operations aufs_sop = { -+ .alloc_inode = aufs_alloc_inode, -+ .destroy_inode = aufs_destroy_inode, -+ .free_inode = aufs_free_inode, -+ /* always deleting, no clearing */ -+ .drop_inode = generic_delete_inode, -+ .show_options = aufs_show_options, -+ .statfs = aufs_statfs, -+ .put_super = aufs_put_super, -+ .sync_fs = aufs_sync_fs, -+ .remount_fs = aufs_remount_fs -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int alloc_root(struct super_block *sb) -+{ -+ int err; -+ struct inode *inode; -+ struct dentry *root; -+ -+ err = -ENOMEM; -+ inode = au_iget_locked(sb, AUFS_ROOT_INO); -+ err = PTR_ERR(inode); -+ if (IS_ERR(inode)) -+ goto out; -+ -+ inode->i_op = aufs_iop + AuIop_DIR; /* with getattr by default */ -+ inode->i_fop = &aufs_dir_fop; -+ inode->i_mode = S_IFDIR; -+ set_nlink(inode, 2); -+ unlock_new_inode(inode); -+ -+ root = d_make_root(inode); -+ if (unlikely(!root)) -+ goto out; -+ err = PTR_ERR(root); -+ if (IS_ERR(root)) -+ goto out; -+ -+ err = au_di_init(root); -+ if (!err) { -+ sb->s_root = root; -+ return 0; /* success */ -+ } -+ dput(root); -+ -+out: -+ return err; -+} -+ -+static int aufs_fill_super(struct super_block *sb, void *raw_data, -+ int silent __maybe_unused) -+{ -+ int err; -+ struct au_opts opts = { -+ .opt = NULL -+ }; -+ struct au_sbinfo *sbinfo; -+ struct dentry *root; -+ struct inode *inode; -+ char *arg = raw_data; -+ -+ if (unlikely(!arg || !*arg)) { -+ err = -EINVAL; -+ pr_err("no arg\n"); -+ goto out; -+ } -+ -+ err = -ENOMEM; -+ opts.opt = (void *)__get_free_page(GFP_NOFS); -+ if (unlikely(!opts.opt)) -+ goto out; -+ opts.max_opt = PAGE_SIZE / sizeof(*opts.opt); -+ opts.sb_flags = sb->s_flags; -+ -+ err = au_si_alloc(sb); -+ if (unlikely(err)) -+ goto out_opts; -+ sbinfo = au_sbi(sb); -+ -+ /* all timestamps always follow the ones on the branch */ -+ sb->s_flags |= SB_NOATIME | SB_NODIRATIME; -+ sb->s_flags |= SB_I_VERSION; /* do we really need this? */ -+ sb->s_op = &aufs_sop; -+ sb->s_d_op = &aufs_dop; -+ sb->s_magic = AUFS_SUPER_MAGIC; -+ sb->s_maxbytes = 0; -+ sb->s_stack_depth = 1; -+ au_export_init(sb); -+ au_xattr_init(sb); -+ -+ err = alloc_root(sb); -+ if (unlikely(err)) { -+ si_write_unlock(sb); -+ goto out_info; -+ } -+ root = sb->s_root; -+ inode = d_inode(root); -+ -+ /* -+ * actually we can parse options regardless aufs lock here. -+ * but at remount time, parsing must be done before aufs lock. -+ * so we follow the same rule. -+ */ -+ ii_write_lock_parent(inode); -+ aufs_write_unlock(root); -+ err = au_opts_parse(sb, arg, &opts); -+ if (unlikely(err)) -+ goto out_root; -+ -+ /* lock vfs_inode first, then aufs. */ -+ inode_lock(inode); -+ aufs_write_lock(root); -+ err = au_opts_mount(sb, &opts); -+ au_opts_free(&opts); -+ if (!err && au_ftest_si(sbinfo, NO_DREVAL)) { -+ sb->s_d_op = &aufs_dop_noreval; -+ pr_info("%ps\n", sb->s_d_op); -+ au_refresh_dop(root, /*force_reval*/0); -+ sbinfo->si_iop_array = aufs_iop_nogetattr; -+ au_refresh_iop(inode, /*force_getattr*/0); -+ } -+ aufs_write_unlock(root); -+ inode_unlock(inode); -+ if (!err) -+ goto out_opts; /* success */ -+ -+out_root: -+ dput(root); -+ sb->s_root = NULL; -+out_info: -+ kobject_put(&sbinfo->si_kobj); -+ sb->s_fs_info = NULL; -+out_opts: -+ free_page((unsigned long)opts.opt); -+out: -+ AuTraceErr(err); -+ err = cvt_err(err); -+ AuTraceErr(err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static struct dentry *aufs_mount(struct file_system_type *fs_type, int flags, -+ const char *dev_name __maybe_unused, -+ void *raw_data) -+{ -+ struct dentry *root; -+ -+ /* all timestamps always follow the ones on the branch */ -+ /* mnt->mnt_flags |= MNT_NOATIME | MNT_NODIRATIME; */ -+ root = mount_nodev(fs_type, flags, raw_data, aufs_fill_super); -+ if (IS_ERR(root)) -+ goto out; -+ -+ au_sbilist_add(root->d_sb); -+ -+out: -+ return root; -+} -+ -+static void aufs_kill_sb(struct super_block *sb) -+{ -+ struct au_sbinfo *sbinfo; -+ -+ sbinfo = au_sbi(sb); -+ if (sbinfo) { -+ au_sbilist_del(sb); -+ aufs_write_lock(sb->s_root); -+ au_fhsm_fin(sb); -+ if (sbinfo->si_wbr_create_ops->fin) -+ sbinfo->si_wbr_create_ops->fin(sb); -+ if (au_opt_test(sbinfo->si_mntflags, UDBA_HNOTIFY)) { -+ au_opt_set_udba(sbinfo->si_mntflags, UDBA_NONE); -+ au_remount_refresh(sb, /*do_idop*/0); -+ } -+ if (au_opt_test(sbinfo->si_mntflags, PLINK)) -+ au_plink_put(sb, /*verbose*/1); -+ au_xino_clr(sb); -+ au_dr_opt_flush(sb); -+ sbinfo->si_sb = NULL; -+ aufs_write_unlock(sb->s_root); -+ au_nwt_flush(&sbinfo->si_nowait); -+ } -+ kill_anon_super(sb); -+} -+ -+struct file_system_type aufs_fs_type = { -+ .name = AUFS_FSTYPE, -+ /* a race between rename and others */ -+ .fs_flags = FS_RENAME_DOES_D_MOVE, -+ .mount = aufs_mount, -+ .kill_sb = aufs_kill_sb, -+ /* no need to __module_get() and module_put(). */ -+ .owner = THIS_MODULE, -+}; -diff --git a/fs/aufs/super.h b/fs/aufs/super.h -new file mode 100644 -index 000000000000..37f02bb21324 ---- /dev/null -+++ b/fs/aufs/super.h -@@ -0,0 +1,589 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * super_block operations -+ */ -+ -+#ifndef __AUFS_SUPER_H__ -+#define __AUFS_SUPER_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/fs.h> -+#include <linux/kobject.h> -+#include "hbl.h" -+#include "lcnt.h" -+#include "rwsem.h" -+#include "wkq.h" -+ -+/* policies to select one among multiple writable branches */ -+struct au_wbr_copyup_operations { -+ int (*copyup)(struct dentry *dentry); -+}; -+ -+#define AuWbr_DIR 1 /* target is a dir */ -+#define AuWbr_PARENT (1 << 1) /* always require a parent */ -+ -+#define au_ftest_wbr(flags, name) ((flags) & AuWbr_##name) -+#define au_fset_wbr(flags, name) { (flags) |= AuWbr_##name; } -+#define au_fclr_wbr(flags, name) { (flags) &= ~AuWbr_##name; } -+ -+struct au_wbr_create_operations { -+ int (*create)(struct dentry *dentry, unsigned int flags); -+ int (*init)(struct super_block *sb); -+ int (*fin)(struct super_block *sb); -+}; -+ -+struct au_wbr_mfs { -+ struct mutex mfs_lock; /* protect this structure */ -+ unsigned long mfs_jiffy; -+ unsigned long mfs_expire; -+ aufs_bindex_t mfs_bindex; -+ -+ unsigned long long mfsrr_bytes; -+ unsigned long long mfsrr_watermark; -+}; -+ -+#define AuPlink_NHASH 100 -+static inline int au_plink_hash(ino_t ino) -+{ -+ return ino % AuPlink_NHASH; -+} -+ -+/* File-based Hierarchical Storage Management */ -+struct au_fhsm { -+#ifdef CONFIG_AUFS_FHSM -+ /* allow only one process who can receive the notification */ -+ spinlock_t fhsm_spin; -+ pid_t fhsm_pid; -+ wait_queue_head_t fhsm_wqh; -+ atomic_t fhsm_readable; -+ -+ /* these are protected by si_rwsem */ -+ unsigned long fhsm_expire; -+ aufs_bindex_t fhsm_bottom; -+#endif -+}; -+ -+struct au_branch; -+struct au_sbinfo { -+ /* nowait tasks in the system-wide workqueue */ -+ struct au_nowait_tasks si_nowait; -+ -+ /* -+ * tried sb->s_umount, but failed due to the dependency between i_mutex. -+ * rwsem for au_sbinfo is necessary. -+ */ -+ struct au_rwsem si_rwsem; -+ -+ /* -+ * dirty approach to protect sb->sb_inodes and ->s_files (gone) from -+ * remount. -+ */ -+ au_lcnt_t si_ninodes, si_nfiles; -+ -+ /* branch management */ -+ unsigned int si_generation; -+ -+ /* see AuSi_ flags */ -+ unsigned char au_si_status; -+ -+ aufs_bindex_t si_bbot; -+ -+ /* dirty trick to keep br_id plus */ -+ unsigned int si_last_br_id : -+ sizeof(aufs_bindex_t) * BITS_PER_BYTE - 1; -+ struct au_branch **si_branch; -+ -+ /* policy to select a writable branch */ -+ unsigned char si_wbr_copyup; -+ unsigned char si_wbr_create; -+ struct au_wbr_copyup_operations *si_wbr_copyup_ops; -+ struct au_wbr_create_operations *si_wbr_create_ops; -+ -+ /* round robin */ -+ atomic_t si_wbr_rr_next; -+ -+ /* most free space */ -+ struct au_wbr_mfs si_wbr_mfs; -+ -+ /* File-based Hierarchical Storage Management */ -+ struct au_fhsm si_fhsm; -+ -+ /* mount flags */ -+ /* include/asm-ia64/siginfo.h defines a macro named si_flags */ -+ unsigned int si_mntflags; -+ -+ /* external inode number (bitmap and translation table) */ -+ vfs_readf_t si_xread; -+ vfs_writef_t si_xwrite; -+ loff_t si_ximaxent; /* max entries in a xino */ -+ -+ struct file *si_xib; -+ struct mutex si_xib_mtx; /* protect xib members */ -+ unsigned long *si_xib_buf; -+ unsigned long si_xib_last_pindex; -+ int si_xib_next_bit; -+ -+ unsigned long si_xino_jiffy; -+ unsigned long si_xino_expire; -+ /* reserved for future use */ -+ /* unsigned long long si_xib_limit; */ /* Max xib file size */ -+ -+#ifdef CONFIG_AUFS_EXPORT -+ /* i_generation */ -+ /* todo: make xigen file an array to support many inode numbers */ -+ struct file *si_xigen; -+ atomic_t si_xigen_next; -+#endif -+ -+ /* dirty trick to support atomic_open */ -+ struct hlist_bl_head si_aopen; -+ -+ /* vdir parameters */ -+ unsigned long si_rdcache; /* max cache time in jiffies */ -+ unsigned int si_rdblk; /* deblk size */ -+ unsigned int si_rdhash; /* hash size */ -+ -+ /* -+ * If the number of whiteouts are larger than si_dirwh, leave all of -+ * them after au_whtmp_ren to reduce the cost of rmdir(2). -+ * future fsck.aufs or kernel thread will remove them later. -+ * Otherwise, remove all whiteouts and the dir in rmdir(2). -+ */ -+ unsigned int si_dirwh; -+ -+ /* pseudo_link list */ -+ struct hlist_bl_head si_plink[AuPlink_NHASH]; -+ wait_queue_head_t si_plink_wq; -+ spinlock_t si_plink_maint_lock; -+ pid_t si_plink_maint_pid; -+ -+ /* file list */ -+ struct hlist_bl_head si_files; -+ -+ /* with/without getattr, brother of sb->s_d_op */ -+ struct inode_operations *si_iop_array; -+ -+ /* -+ * sysfs and lifetime management. -+ * this is not a small structure and it may be a waste of memory in case -+ * of sysfs is disabled, particularly when many aufs-es are mounted. -+ * but using sysfs is majority. -+ */ -+ struct kobject si_kobj; -+#ifdef CONFIG_DEBUG_FS -+ struct dentry *si_dbgaufs; -+ struct dentry *si_dbgaufs_plink; -+ struct dentry *si_dbgaufs_xib; -+#ifdef CONFIG_AUFS_EXPORT -+ struct dentry *si_dbgaufs_xigen; -+#endif -+#endif -+ -+#ifdef CONFIG_AUFS_SBILIST -+ struct hlist_bl_node si_list; -+#endif -+ -+ /* dirty, necessary for unmounting, sysfs and sysrq */ -+ struct super_block *si_sb; -+}; -+ -+/* sbinfo status flags */ -+/* -+ * set true when refresh_dirs() failed at remount time. -+ * then try refreshing dirs at access time again. -+ * if it is false, refreshing dirs at access time is unnecessary -+ */ -+#define AuSi_FAILED_REFRESH_DIR 1 -+#define AuSi_FHSM (1 << 1) /* fhsm is active now */ -+#define AuSi_NO_DREVAL (1 << 2) /* disable all d_revalidate */ -+ -+#ifndef CONFIG_AUFS_FHSM -+#undef AuSi_FHSM -+#define AuSi_FHSM 0 -+#endif -+ -+static inline unsigned char au_do_ftest_si(struct au_sbinfo *sbi, -+ unsigned int flag) -+{ -+ AuRwMustAnyLock(&sbi->si_rwsem); -+ return sbi->au_si_status & flag; -+} -+#define au_ftest_si(sbinfo, name) au_do_ftest_si(sbinfo, AuSi_##name) -+#define au_fset_si(sbinfo, name) do { \ -+ AuRwMustWriteLock(&(sbinfo)->si_rwsem); \ -+ (sbinfo)->au_si_status |= AuSi_##name; \ -+} while (0) -+#define au_fclr_si(sbinfo, name) do { \ -+ AuRwMustWriteLock(&(sbinfo)->si_rwsem); \ -+ (sbinfo)->au_si_status &= ~AuSi_##name; \ -+} while (0) -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* policy to select one among writable branches */ -+#define AuWbrCopyup(sbinfo, ...) \ -+ ((sbinfo)->si_wbr_copyup_ops->copyup(__VA_ARGS__)) -+#define AuWbrCreate(sbinfo, ...) \ -+ ((sbinfo)->si_wbr_create_ops->create(__VA_ARGS__)) -+ -+/* flags for si_read_lock()/aufs_read_lock()/di_read_lock() */ -+#define AuLock_DW 1 /* write-lock dentry */ -+#define AuLock_IR (1 << 1) /* read-lock inode */ -+#define AuLock_IW (1 << 2) /* write-lock inode */ -+#define AuLock_FLUSH (1 << 3) /* wait for 'nowait' tasks */ -+#define AuLock_DIRS (1 << 4) /* target is a pair of dirs */ -+ /* except RENAME_EXCHANGE */ -+#define AuLock_NOPLM (1 << 5) /* return err in plm mode */ -+#define AuLock_NOPLMW (1 << 6) /* wait for plm mode ends */ -+#define AuLock_GEN (1 << 7) /* test digen/iigen */ -+#define au_ftest_lock(flags, name) ((flags) & AuLock_##name) -+#define au_fset_lock(flags, name) \ -+ do { (flags) |= AuLock_##name; } while (0) -+#define au_fclr_lock(flags, name) \ -+ do { (flags) &= ~AuLock_##name; } while (0) -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* super.c */ -+extern struct file_system_type aufs_fs_type; -+struct inode *au_iget_locked(struct super_block *sb, ino_t ino); -+typedef unsigned long long (*au_arraycb_t)(struct super_block *sb, void *array, -+ unsigned long long max, void *arg); -+void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, -+ struct super_block *sb, void *arg); -+struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max); -+void au_iarray_free(struct inode **a, unsigned long long max); -+ -+/* sbinfo.c */ -+void au_si_free(struct kobject *kobj); -+int au_si_alloc(struct super_block *sb); -+int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr, int may_shrink); -+ -+unsigned int au_sigen_inc(struct super_block *sb); -+aufs_bindex_t au_new_br_id(struct super_block *sb); -+ -+int si_read_lock(struct super_block *sb, int flags); -+int si_write_lock(struct super_block *sb, int flags); -+int aufs_read_lock(struct dentry *dentry, int flags); -+void aufs_read_unlock(struct dentry *dentry, int flags); -+void aufs_write_lock(struct dentry *dentry); -+void aufs_write_unlock(struct dentry *dentry); -+int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags); -+void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2); -+ -+/* wbr_policy.c */ -+extern struct au_wbr_copyup_operations au_wbr_copyup_ops[]; -+extern struct au_wbr_create_operations au_wbr_create_ops[]; -+int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst); -+int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex); -+int au_wbr_do_copyup_bu(struct dentry *dentry, aufs_bindex_t btop); -+ -+/* mvdown.c */ -+int au_mvdown(struct dentry *dentry, struct aufs_mvdown __user *arg); -+ -+#ifdef CONFIG_AUFS_FHSM -+/* fhsm.c */ -+ -+static inline pid_t au_fhsm_pid(struct au_fhsm *fhsm) -+{ -+ pid_t pid; -+ -+ spin_lock(&fhsm->fhsm_spin); -+ pid = fhsm->fhsm_pid; -+ spin_unlock(&fhsm->fhsm_spin); -+ -+ return pid; -+} -+ -+void au_fhsm_wrote(struct super_block *sb, aufs_bindex_t bindex, int force); -+void au_fhsm_wrote_all(struct super_block *sb, int force); -+int au_fhsm_fd(struct super_block *sb, int oflags); -+int au_fhsm_br_alloc(struct au_branch *br); -+void au_fhsm_set_bottom(struct super_block *sb, aufs_bindex_t bindex); -+void au_fhsm_fin(struct super_block *sb); -+void au_fhsm_init(struct au_sbinfo *sbinfo); -+void au_fhsm_set(struct au_sbinfo *sbinfo, unsigned int sec); -+void au_fhsm_show(struct seq_file *seq, struct au_sbinfo *sbinfo); -+#else -+AuStubVoid(au_fhsm_wrote, struct super_block *sb, aufs_bindex_t bindex, -+ int force) -+AuStubVoid(au_fhsm_wrote_all, struct super_block *sb, int force) -+AuStub(int, au_fhsm_fd, return -EOPNOTSUPP, struct super_block *sb, int oflags) -+AuStub(pid_t, au_fhsm_pid, return 0, struct au_fhsm *fhsm) -+AuStubInt0(au_fhsm_br_alloc, struct au_branch *br) -+AuStubVoid(au_fhsm_set_bottom, struct super_block *sb, aufs_bindex_t bindex) -+AuStubVoid(au_fhsm_fin, struct super_block *sb) -+AuStubVoid(au_fhsm_init, struct au_sbinfo *sbinfo) -+AuStubVoid(au_fhsm_set, struct au_sbinfo *sbinfo, unsigned int sec) -+AuStubVoid(au_fhsm_show, struct seq_file *seq, struct au_sbinfo *sbinfo) -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline struct au_sbinfo *au_sbi(struct super_block *sb) -+{ -+ return sb->s_fs_info; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+#ifdef CONFIG_AUFS_EXPORT -+int au_test_nfsd(void); -+void au_export_init(struct super_block *sb); -+void au_xigen_inc(struct inode *inode); -+int au_xigen_new(struct inode *inode); -+int au_xigen_set(struct super_block *sb, struct path *path); -+void au_xigen_clr(struct super_block *sb); -+ -+static inline int au_busy_or_stale(void) -+{ -+ if (!au_test_nfsd()) -+ return -EBUSY; -+ return -ESTALE; -+} -+#else -+AuStubInt0(au_test_nfsd, void) -+AuStubVoid(au_export_init, struct super_block *sb) -+AuStubVoid(au_xigen_inc, struct inode *inode) -+AuStubInt0(au_xigen_new, struct inode *inode) -+AuStubInt0(au_xigen_set, struct super_block *sb, struct path *path) -+AuStubVoid(au_xigen_clr, struct super_block *sb) -+AuStub(int, au_busy_or_stale, return -EBUSY, void) -+#endif /* CONFIG_AUFS_EXPORT */ -+ -+/* ---------------------------------------------------------------------- */ -+ -+#ifdef CONFIG_AUFS_SBILIST -+/* module.c */ -+extern struct hlist_bl_head au_sbilist; -+ -+static inline void au_sbilist_init(void) -+{ -+ INIT_HLIST_BL_HEAD(&au_sbilist); -+} -+ -+static inline void au_sbilist_add(struct super_block *sb) -+{ -+ au_hbl_add(&au_sbi(sb)->si_list, &au_sbilist); -+} -+ -+static inline void au_sbilist_del(struct super_block *sb) -+{ -+ au_hbl_del(&au_sbi(sb)->si_list, &au_sbilist); -+} -+ -+#ifdef CONFIG_AUFS_MAGIC_SYSRQ -+static inline void au_sbilist_lock(void) -+{ -+ hlist_bl_lock(&au_sbilist); -+} -+ -+static inline void au_sbilist_unlock(void) -+{ -+ hlist_bl_unlock(&au_sbilist); -+} -+#define AuGFP_SBILIST GFP_ATOMIC -+#else -+AuStubVoid(au_sbilist_lock, void) -+AuStubVoid(au_sbilist_unlock, void) -+#define AuGFP_SBILIST GFP_NOFS -+#endif /* CONFIG_AUFS_MAGIC_SYSRQ */ -+#else -+AuStubVoid(au_sbilist_init, void) -+AuStubVoid(au_sbilist_add, struct super_block *sb) -+AuStubVoid(au_sbilist_del, struct super_block *sb) -+AuStubVoid(au_sbilist_lock, void) -+AuStubVoid(au_sbilist_unlock, void) -+#define AuGFP_SBILIST GFP_NOFS -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline void dbgaufs_si_null(struct au_sbinfo *sbinfo) -+{ -+ /* -+ * This function is a dynamic '__init' function actually, -+ * so the tiny check for si_rwsem is unnecessary. -+ */ -+ /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ -+#ifdef CONFIG_DEBUG_FS -+ sbinfo->si_dbgaufs = NULL; -+ sbinfo->si_dbgaufs_plink = NULL; -+ sbinfo->si_dbgaufs_xib = NULL; -+#ifdef CONFIG_AUFS_EXPORT -+ sbinfo->si_dbgaufs_xigen = NULL; -+#endif -+#endif -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* current->atomic_flags */ -+/* this value should never corrupt the ones defined in linux/sched.h */ -+#define PFA_AUFS 0x10 -+ -+TASK_PFA_TEST(AUFS, test_aufs) /* task_test_aufs */ -+TASK_PFA_SET(AUFS, aufs) /* task_set_aufs */ -+TASK_PFA_CLEAR(AUFS, aufs) /* task_clear_aufs */ -+ -+static inline int si_pid_test(struct super_block *sb) -+{ -+ return !!task_test_aufs(current); -+} -+ -+static inline void si_pid_clr(struct super_block *sb) -+{ -+ AuDebugOn(!task_test_aufs(current)); -+ task_clear_aufs(current); -+} -+ -+static inline void si_pid_set(struct super_block *sb) -+{ -+ AuDebugOn(task_test_aufs(current)); -+ task_set_aufs(current); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* lock superblock. mainly for entry point functions */ -+#define __si_read_lock(sb) au_rw_read_lock(&au_sbi(sb)->si_rwsem) -+#define __si_write_lock(sb) au_rw_write_lock(&au_sbi(sb)->si_rwsem) -+#define __si_read_trylock(sb) au_rw_read_trylock(&au_sbi(sb)->si_rwsem) -+#define __si_write_trylock(sb) au_rw_write_trylock(&au_sbi(sb)->si_rwsem) -+/* -+#define __si_read_trylock_nested(sb) \ -+ au_rw_read_trylock_nested(&au_sbi(sb)->si_rwsem) -+#define __si_write_trylock_nested(sb) \ -+ au_rw_write_trylock_nested(&au_sbi(sb)->si_rwsem) -+*/ -+ -+#define __si_read_unlock(sb) au_rw_read_unlock(&au_sbi(sb)->si_rwsem) -+#define __si_write_unlock(sb) au_rw_write_unlock(&au_sbi(sb)->si_rwsem) -+#define __si_downgrade_lock(sb) au_rw_dgrade_lock(&au_sbi(sb)->si_rwsem) -+ -+#define SiMustNoWaiters(sb) AuRwMustNoWaiters(&au_sbi(sb)->si_rwsem) -+#define SiMustAnyLock(sb) AuRwMustAnyLock(&au_sbi(sb)->si_rwsem) -+#define SiMustWriteLock(sb) AuRwMustWriteLock(&au_sbi(sb)->si_rwsem) -+ -+static inline void si_noflush_read_lock(struct super_block *sb) -+{ -+ __si_read_lock(sb); -+ si_pid_set(sb); -+} -+ -+static inline int si_noflush_read_trylock(struct super_block *sb) -+{ -+ int locked; -+ -+ locked = __si_read_trylock(sb); -+ if (locked) -+ si_pid_set(sb); -+ return locked; -+} -+ -+static inline void si_noflush_write_lock(struct super_block *sb) -+{ -+ __si_write_lock(sb); -+ si_pid_set(sb); -+} -+ -+static inline int si_noflush_write_trylock(struct super_block *sb) -+{ -+ int locked; -+ -+ locked = __si_write_trylock(sb); -+ if (locked) -+ si_pid_set(sb); -+ return locked; -+} -+ -+#if 0 /* reserved */ -+static inline int si_read_trylock(struct super_block *sb, int flags) -+{ -+ if (au_ftest_lock(flags, FLUSH)) -+ au_nwt_flush(&au_sbi(sb)->si_nowait); -+ return si_noflush_read_trylock(sb); -+} -+#endif -+ -+static inline void si_read_unlock(struct super_block *sb) -+{ -+ si_pid_clr(sb); -+ __si_read_unlock(sb); -+} -+ -+#if 0 /* reserved */ -+static inline int si_write_trylock(struct super_block *sb, int flags) -+{ -+ if (au_ftest_lock(flags, FLUSH)) -+ au_nwt_flush(&au_sbi(sb)->si_nowait); -+ return si_noflush_write_trylock(sb); -+} -+#endif -+ -+static inline void si_write_unlock(struct super_block *sb) -+{ -+ si_pid_clr(sb); -+ __si_write_unlock(sb); -+} -+ -+#if 0 /* reserved */ -+static inline void si_downgrade_lock(struct super_block *sb) -+{ -+ __si_downgrade_lock(sb); -+} -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline aufs_bindex_t au_sbbot(struct super_block *sb) -+{ -+ SiMustAnyLock(sb); -+ return au_sbi(sb)->si_bbot; -+} -+ -+static inline unsigned int au_mntflags(struct super_block *sb) -+{ -+ SiMustAnyLock(sb); -+ return au_sbi(sb)->si_mntflags; -+} -+ -+static inline unsigned int au_sigen(struct super_block *sb) -+{ -+ SiMustAnyLock(sb); -+ return au_sbi(sb)->si_generation; -+} -+ -+static inline struct au_branch *au_sbr(struct super_block *sb, -+ aufs_bindex_t bindex) -+{ -+ SiMustAnyLock(sb); -+ return au_sbi(sb)->si_branch[0 + bindex]; -+} -+ -+static inline loff_t au_xi_maxent(struct super_block *sb) -+{ -+ SiMustAnyLock(sb); -+ return au_sbi(sb)->si_ximaxent; -+} -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_SUPER_H__ */ -diff --git a/fs/aufs/sysaufs.c b/fs/aufs/sysaufs.c -new file mode 100644 -index 000000000000..32a0811c54de ---- /dev/null -+++ b/fs/aufs/sysaufs.c -@@ -0,0 +1,93 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * sysfs interface and lifetime management -+ * they are necessary regardless sysfs is disabled. -+ */ -+ -+#include <linux/random.h> -+#include "aufs.h" -+ -+unsigned long sysaufs_si_mask; -+struct kset *sysaufs_kset; -+ -+#define AuSiAttr(_name) { \ -+ .attr = { .name = __stringify(_name), .mode = 0444 }, \ -+ .show = sysaufs_si_##_name, \ -+} -+ -+static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path); -+struct attribute *sysaufs_si_attrs[] = { -+ &sysaufs_si_attr_xi_path.attr, -+ NULL, -+}; -+ -+static const struct sysfs_ops au_sbi_ops = { -+ .show = sysaufs_si_show -+}; -+ -+static struct kobj_type au_sbi_ktype = { -+ .release = au_si_free, -+ .sysfs_ops = &au_sbi_ops, -+ .default_attrs = sysaufs_si_attrs -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+int sysaufs_si_init(struct au_sbinfo *sbinfo) -+{ -+ int err; -+ -+ sbinfo->si_kobj.kset = sysaufs_kset; -+ /* cf. sysaufs_name() */ -+ err = kobject_init_and_add -+ (&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_kset->kobj*/NULL, -+ SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo)); -+ -+ return err; -+} -+ -+void sysaufs_fin(void) -+{ -+ sysfs_remove_group(&sysaufs_kset->kobj, sysaufs_attr_group); -+ kset_unregister(sysaufs_kset); -+} -+ -+int __init sysaufs_init(void) -+{ -+ int err; -+ -+ do { -+ get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask)); -+ } while (!sysaufs_si_mask); -+ -+ err = -EINVAL; -+ sysaufs_kset = kset_create_and_add(AUFS_NAME, NULL, fs_kobj); -+ if (unlikely(!sysaufs_kset)) -+ goto out; -+ err = PTR_ERR(sysaufs_kset); -+ if (IS_ERR(sysaufs_kset)) -+ goto out; -+ err = sysfs_create_group(&sysaufs_kset->kobj, sysaufs_attr_group); -+ if (unlikely(err)) -+ kset_unregister(sysaufs_kset); -+ -+out: -+ return err; -+} -diff --git a/fs/aufs/sysaufs.h b/fs/aufs/sysaufs.h -new file mode 100644 -index 000000000000..195fe279b820 ---- /dev/null -+++ b/fs/aufs/sysaufs.h -@@ -0,0 +1,102 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * sysfs interface and mount lifetime management -+ */ -+ -+#ifndef __SYSAUFS_H__ -+#define __SYSAUFS_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/sysfs.h> -+#include "module.h" -+ -+struct super_block; -+struct au_sbinfo; -+ -+struct sysaufs_si_attr { -+ struct attribute attr; -+ int (*show)(struct seq_file *seq, struct super_block *sb); -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* sysaufs.c */ -+extern unsigned long sysaufs_si_mask; -+extern struct kset *sysaufs_kset; -+extern struct attribute *sysaufs_si_attrs[]; -+int sysaufs_si_init(struct au_sbinfo *sbinfo); -+int __init sysaufs_init(void); -+void sysaufs_fin(void); -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* some people doesn't like to show a pointer in kernel */ -+static inline unsigned long sysaufs_si_id(struct au_sbinfo *sbinfo) -+{ -+ return sysaufs_si_mask ^ (unsigned long)sbinfo; -+} -+ -+#define SysaufsSiNamePrefix "si_" -+#define SysaufsSiNameLen (sizeof(SysaufsSiNamePrefix) + 16) -+static inline void sysaufs_name(struct au_sbinfo *sbinfo, char *name) -+{ -+ snprintf(name, SysaufsSiNameLen, SysaufsSiNamePrefix "%lx", -+ sysaufs_si_id(sbinfo)); -+} -+ -+struct au_branch; -+#ifdef CONFIG_SYSFS -+/* sysfs.c */ -+extern struct attribute_group *sysaufs_attr_group; -+ -+int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb); -+ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr, -+ char *buf); -+long au_brinfo_ioctl(struct file *file, unsigned long arg); -+#ifdef CONFIG_COMPAT -+long au_brinfo_compat_ioctl(struct file *file, unsigned long arg); -+#endif -+ -+void sysaufs_br_init(struct au_branch *br); -+void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex); -+void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex); -+ -+#define sysaufs_brs_init() do {} while (0) -+ -+#else -+#define sysaufs_attr_group NULL -+ -+AuStubInt0(sysaufs_si_xi_path, struct seq_file *seq, struct super_block *sb) -+AuStub(ssize_t, sysaufs_si_show, return 0, struct kobject *kobj, -+ struct attribute *attr, char *buf) -+AuStubVoid(sysaufs_br_init, struct au_branch *br) -+AuStubVoid(sysaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex) -+AuStubVoid(sysaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex) -+ -+static inline void sysaufs_brs_init(void) -+{ -+ sysaufs_brs = 0; -+} -+ -+#endif /* CONFIG_SYSFS */ -+ -+#endif /* __KERNEL__ */ -+#endif /* __SYSAUFS_H__ */ -diff --git a/fs/aufs/sysfs.c b/fs/aufs/sysfs.c -new file mode 100644 -index 000000000000..eda987628dbb ---- /dev/null -+++ b/fs/aufs/sysfs.c -@@ -0,0 +1,374 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * sysfs interface -+ */ -+ -+#include <linux/compat.h> -+#include <linux/seq_file.h> -+#include "aufs.h" -+ -+#ifdef CONFIG_AUFS_FS_MODULE -+/* this entry violates the "one line per file" policy of sysfs */ -+static ssize_t config_show(struct kobject *kobj, struct kobj_attribute *attr, -+ char *buf) -+{ -+ ssize_t err; -+ static char *conf = -+/* this file is generated at compiling */ -+#include "conf.str" -+ ; -+ -+ err = snprintf(buf, PAGE_SIZE, conf); -+ if (unlikely(err >= PAGE_SIZE)) -+ err = -EFBIG; -+ return err; -+} -+ -+static struct kobj_attribute au_config_attr = __ATTR_RO(config); -+#endif -+ -+static struct attribute *au_attr[] = { -+#ifdef CONFIG_AUFS_FS_MODULE -+ &au_config_attr.attr, -+#endif -+ NULL, /* need to NULL terminate the list of attributes */ -+}; -+ -+static struct attribute_group sysaufs_attr_group_body = { -+ .attrs = au_attr -+}; -+ -+struct attribute_group *sysaufs_attr_group = &sysaufs_attr_group_body; -+ -+/* ---------------------------------------------------------------------- */ -+ -+int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb) -+{ -+ int err; -+ -+ SiMustAnyLock(sb); -+ -+ err = 0; -+ if (au_opt_test(au_mntflags(sb), XINO)) { -+ err = au_xino_path(seq, au_sbi(sb)->si_xib); -+ seq_putc(seq, '\n'); -+ } -+ return err; -+} -+ -+/* -+ * the lifetime of branch is independent from the entry under sysfs. -+ * sysfs handles the lifetime of the entry, and never call ->show() after it is -+ * unlinked. -+ */ -+static int sysaufs_si_br(struct seq_file *seq, struct super_block *sb, -+ aufs_bindex_t bindex, int idx) -+{ -+ int err; -+ struct path path; -+ struct dentry *root; -+ struct au_branch *br; -+ au_br_perm_str_t perm; -+ -+ AuDbg("b%d\n", bindex); -+ -+ err = 0; -+ root = sb->s_root; -+ di_read_lock_parent(root, !AuLock_IR); -+ br = au_sbr(sb, bindex); -+ -+ switch (idx) { -+ case AuBrSysfs_BR: -+ path.mnt = au_br_mnt(br); -+ path.dentry = au_h_dptr(root, bindex); -+ err = au_seq_path(seq, &path); -+ if (!err) { -+ au_optstr_br_perm(&perm, br->br_perm); -+ seq_printf(seq, "=%s\n", perm.a); -+ } -+ break; -+ case AuBrSysfs_BRID: -+ seq_printf(seq, "%d\n", br->br_id); -+ break; -+ } -+ di_read_unlock(root, !AuLock_IR); -+ if (unlikely(err || seq_has_overflowed(seq))) -+ err = -E2BIG; -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static struct seq_file *au_seq(char *p, ssize_t len) -+{ -+ struct seq_file *seq; -+ -+ seq = kzalloc(sizeof(*seq), GFP_NOFS); -+ if (seq) { -+ /* mutex_init(&seq.lock); */ -+ seq->buf = p; -+ seq->size = len; -+ return seq; /* success */ -+ } -+ -+ seq = ERR_PTR(-ENOMEM); -+ return seq; -+} -+ -+#define SysaufsBr_PREFIX "br" -+#define SysaufsBrid_PREFIX "brid" -+ -+/* todo: file size may exceed PAGE_SIZE */ -+ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr, -+ char *buf) -+{ -+ ssize_t err; -+ int idx; -+ long l; -+ aufs_bindex_t bbot; -+ struct au_sbinfo *sbinfo; -+ struct super_block *sb; -+ struct seq_file *seq; -+ char *name; -+ struct attribute **cattr; -+ -+ sbinfo = container_of(kobj, struct au_sbinfo, si_kobj); -+ sb = sbinfo->si_sb; -+ -+ /* -+ * prevent a race condition between sysfs and aufs. -+ * for instance, sysfs_file_read() calls sysfs_get_active_two() which -+ * prohibits maintaining the sysfs entries. -+ * hew we acquire read lock after sysfs_get_active_two(). -+ * on the other hand, the remount process may maintain the sysfs/aufs -+ * entries after acquiring write lock. -+ * it can cause a deadlock. -+ * simply we gave up processing read here. -+ */ -+ err = -EBUSY; -+ if (unlikely(!si_noflush_read_trylock(sb))) -+ goto out; -+ -+ seq = au_seq(buf, PAGE_SIZE); -+ err = PTR_ERR(seq); -+ if (IS_ERR(seq)) -+ goto out_unlock; -+ -+ name = (void *)attr->name; -+ cattr = sysaufs_si_attrs; -+ while (*cattr) { -+ if (!strcmp(name, (*cattr)->name)) { -+ err = container_of(*cattr, struct sysaufs_si_attr, attr) -+ ->show(seq, sb); -+ goto out_seq; -+ } -+ cattr++; -+ } -+ -+ if (!strncmp(name, SysaufsBrid_PREFIX, -+ sizeof(SysaufsBrid_PREFIX) - 1)) { -+ idx = AuBrSysfs_BRID; -+ name += sizeof(SysaufsBrid_PREFIX) - 1; -+ } else if (!strncmp(name, SysaufsBr_PREFIX, -+ sizeof(SysaufsBr_PREFIX) - 1)) { -+ idx = AuBrSysfs_BR; -+ name += sizeof(SysaufsBr_PREFIX) - 1; -+ } else -+ BUG(); -+ -+ err = kstrtol(name, 10, &l); -+ if (!err) { -+ bbot = au_sbbot(sb); -+ if (l <= bbot) -+ err = sysaufs_si_br(seq, sb, (aufs_bindex_t)l, idx); -+ else -+ err = -ENOENT; -+ } -+ -+out_seq: -+ if (!err) { -+ err = seq->count; -+ /* sysfs limit */ -+ if (unlikely(err == PAGE_SIZE)) -+ err = -EFBIG; -+ } -+ au_kfree_rcu(seq); -+out_unlock: -+ si_read_unlock(sb); -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_brinfo(struct super_block *sb, union aufs_brinfo __user *arg) -+{ -+ int err; -+ int16_t brid; -+ aufs_bindex_t bindex, bbot; -+ size_t sz; -+ char *buf; -+ struct seq_file *seq; -+ struct au_branch *br; -+ -+ si_read_lock(sb, AuLock_FLUSH); -+ bbot = au_sbbot(sb); -+ err = bbot + 1; -+ if (!arg) -+ goto out; -+ -+ err = -ENOMEM; -+ buf = (void *)__get_free_page(GFP_NOFS); -+ if (unlikely(!buf)) -+ goto out; -+ -+ seq = au_seq(buf, PAGE_SIZE); -+ err = PTR_ERR(seq); -+ if (IS_ERR(seq)) -+ goto out_buf; -+ -+ sz = sizeof(*arg) - offsetof(union aufs_brinfo, path); -+ for (bindex = 0; bindex <= bbot; bindex++, arg++) { -+ /* VERIFY_WRITE */ -+ err = !access_ok(arg, sizeof(*arg)); -+ if (unlikely(err)) -+ break; -+ -+ br = au_sbr(sb, bindex); -+ brid = br->br_id; -+ BUILD_BUG_ON(sizeof(brid) != sizeof(arg->id)); -+ err = __put_user(brid, &arg->id); -+ if (unlikely(err)) -+ break; -+ -+ BUILD_BUG_ON(sizeof(br->br_perm) != sizeof(arg->perm)); -+ err = __put_user(br->br_perm, &arg->perm); -+ if (unlikely(err)) -+ break; -+ -+ err = au_seq_path(seq, &br->br_path); -+ if (unlikely(err)) -+ break; -+ seq_putc(seq, '\0'); -+ if (!seq_has_overflowed(seq)) { -+ err = copy_to_user(arg->path, seq->buf, seq->count); -+ seq->count = 0; -+ if (unlikely(err)) -+ break; -+ } else { -+ err = -E2BIG; -+ goto out_seq; -+ } -+ } -+ if (unlikely(err)) -+ err = -EFAULT; -+ -+out_seq: -+ au_kfree_rcu(seq); -+out_buf: -+ free_page((unsigned long)buf); -+out: -+ si_read_unlock(sb); -+ return err; -+} -+ -+long au_brinfo_ioctl(struct file *file, unsigned long arg) -+{ -+ return au_brinfo(file->f_path.dentry->d_sb, (void __user *)arg); -+} -+ -+#ifdef CONFIG_COMPAT -+long au_brinfo_compat_ioctl(struct file *file, unsigned long arg) -+{ -+ return au_brinfo(file->f_path.dentry->d_sb, compat_ptr(arg)); -+} -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+void sysaufs_br_init(struct au_branch *br) -+{ -+ int i; -+ struct au_brsysfs *br_sysfs; -+ struct attribute *attr; -+ -+ br_sysfs = br->br_sysfs; -+ for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) { -+ attr = &br_sysfs->attr; -+ sysfs_attr_init(attr); -+ attr->name = br_sysfs->name; -+ attr->mode = 0444; -+ br_sysfs++; -+ } -+} -+ -+void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex) -+{ -+ struct au_branch *br; -+ struct kobject *kobj; -+ struct au_brsysfs *br_sysfs; -+ int i; -+ aufs_bindex_t bbot; -+ -+ if (!sysaufs_brs) -+ return; -+ -+ kobj = &au_sbi(sb)->si_kobj; -+ bbot = au_sbbot(sb); -+ for (; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ br_sysfs = br->br_sysfs; -+ for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) { -+ sysfs_remove_file(kobj, &br_sysfs->attr); -+ br_sysfs++; -+ } -+ } -+} -+ -+void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex) -+{ -+ int err, i; -+ aufs_bindex_t bbot; -+ struct kobject *kobj; -+ struct au_branch *br; -+ struct au_brsysfs *br_sysfs; -+ -+ if (!sysaufs_brs) -+ return; -+ -+ kobj = &au_sbi(sb)->si_kobj; -+ bbot = au_sbbot(sb); -+ for (; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ br_sysfs = br->br_sysfs; -+ snprintf(br_sysfs[AuBrSysfs_BR].name, sizeof(br_sysfs->name), -+ SysaufsBr_PREFIX "%d", bindex); -+ snprintf(br_sysfs[AuBrSysfs_BRID].name, sizeof(br_sysfs->name), -+ SysaufsBrid_PREFIX "%d", bindex); -+ for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) { -+ err = sysfs_create_file(kobj, &br_sysfs->attr); -+ if (unlikely(err)) -+ pr_warn("failed %s under sysfs(%d)\n", -+ br_sysfs->name, err); -+ br_sysfs++; -+ } -+ } -+} -diff --git a/fs/aufs/sysrq.c b/fs/aufs/sysrq.c -new file mode 100644 -index 000000000000..db10ec528f5d ---- /dev/null -+++ b/fs/aufs/sysrq.c -@@ -0,0 +1,160 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * magic sysrq handler -+ */ -+ -+/* #include <linux/sysrq.h> */ -+#include <linux/writeback.h> -+#include "aufs.h" -+ -+/* ---------------------------------------------------------------------- */ -+ -+static void sysrq_sb(struct super_block *sb) -+{ -+ char *plevel; -+ struct au_sbinfo *sbinfo; -+ struct file *file; -+ struct hlist_bl_head *files; -+ struct hlist_bl_node *pos; -+ struct au_finfo *finfo; -+ -+ plevel = au_plevel; -+ au_plevel = KERN_WARNING; -+ -+ /* since we define pr_fmt, call printk directly */ -+#define pr(str) printk(KERN_WARNING AUFS_NAME ": " str) -+ -+ sbinfo = au_sbi(sb); -+ printk(KERN_WARNING "si=%lx\n", sysaufs_si_id(sbinfo)); -+ pr("superblock\n"); -+ au_dpri_sb(sb); -+ -+#if 0 -+ pr("root dentry\n"); -+ au_dpri_dentry(sb->s_root); -+ pr("root inode\n"); -+ au_dpri_inode(d_inode(sb->s_root)); -+#endif -+ -+#if 0 -+ do { -+ int err, i, j, ndentry; -+ struct au_dcsub_pages dpages; -+ struct au_dpage *dpage; -+ -+ err = au_dpages_init(&dpages, GFP_ATOMIC); -+ if (unlikely(err)) -+ break; -+ err = au_dcsub_pages(&dpages, sb->s_root, NULL, NULL); -+ if (!err) -+ for (i = 0; i < dpages.ndpage; i++) { -+ dpage = dpages.dpages + i; -+ ndentry = dpage->ndentry; -+ for (j = 0; j < ndentry; j++) -+ au_dpri_dentry(dpage->dentries[j]); -+ } -+ au_dpages_free(&dpages); -+ } while (0); -+#endif -+ -+#if 1 -+ { -+ struct inode *i; -+ -+ pr("isolated inode\n"); -+ spin_lock(&sb->s_inode_list_lock); -+ list_for_each_entry(i, &sb->s_inodes, i_sb_list) { -+ spin_lock(&i->i_lock); -+ if (1 || hlist_empty(&i->i_dentry)) -+ au_dpri_inode(i); -+ spin_unlock(&i->i_lock); -+ } -+ spin_unlock(&sb->s_inode_list_lock); -+ } -+#endif -+ pr("files\n"); -+ files = &au_sbi(sb)->si_files; -+ hlist_bl_lock(files); -+ hlist_bl_for_each_entry(finfo, pos, files, fi_hlist) { -+ umode_t mode; -+ -+ file = finfo->fi_file; -+ mode = file_inode(file)->i_mode; -+ if (!special_file(mode)) -+ au_dpri_file(file); -+ } -+ hlist_bl_unlock(files); -+ pr("done\n"); -+ -+#undef pr -+ au_plevel = plevel; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* module parameter */ -+static char *aufs_sysrq_key = "a"; -+module_param_named(sysrq, aufs_sysrq_key, charp, 0444); -+MODULE_PARM_DESC(sysrq, "MagicSysRq key for " AUFS_NAME); -+ -+static void au_sysrq(int key __maybe_unused) -+{ -+ struct au_sbinfo *sbinfo; -+ struct hlist_bl_node *pos; -+ -+ lockdep_off(); -+ au_sbilist_lock(); -+ hlist_bl_for_each_entry(sbinfo, pos, &au_sbilist, si_list) -+ sysrq_sb(sbinfo->si_sb); -+ au_sbilist_unlock(); -+ lockdep_on(); -+} -+ -+static struct sysrq_key_op au_sysrq_op = { -+ .handler = au_sysrq, -+ .help_msg = "Aufs", -+ .action_msg = "Aufs", -+ .enable_mask = SYSRQ_ENABLE_DUMP -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+int __init au_sysrq_init(void) -+{ -+ int err; -+ char key; -+ -+ err = -1; -+ key = *aufs_sysrq_key; -+ if ('a' <= key && key <= 'z') -+ err = register_sysrq_key(key, &au_sysrq_op); -+ if (unlikely(err)) -+ pr_err("err %d, sysrq=%c\n", err, key); -+ return err; -+} -+ -+void au_sysrq_fin(void) -+{ -+ int err; -+ -+ err = unregister_sysrq_key(*aufs_sysrq_key, &au_sysrq_op); -+ if (unlikely(err)) -+ pr_err("err %d (ignored)\n", err); -+} -diff --git a/fs/aufs/vdir.c b/fs/aufs/vdir.c -new file mode 100644 -index 000000000000..dc768f5d90c6 ---- /dev/null -+++ b/fs/aufs/vdir.c -@@ -0,0 +1,896 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * virtual or vertical directory -+ */ -+ -+#include <linux/iversion.h> -+#include "aufs.h" -+ -+static unsigned int calc_size(int nlen) -+{ -+ return ALIGN(sizeof(struct au_vdir_de) + nlen, sizeof(ino_t)); -+} -+ -+static int set_deblk_end(union au_vdir_deblk_p *p, -+ union au_vdir_deblk_p *deblk_end) -+{ -+ if (calc_size(0) <= deblk_end->deblk - p->deblk) { -+ p->de->de_str.len = 0; -+ /* smp_mb(); */ -+ return 0; -+ } -+ return -1; /* error */ -+} -+ -+/* returns true or false */ -+static int is_deblk_end(union au_vdir_deblk_p *p, -+ union au_vdir_deblk_p *deblk_end) -+{ -+ if (calc_size(0) <= deblk_end->deblk - p->deblk) -+ return !p->de->de_str.len; -+ return 1; -+} -+ -+static unsigned char *last_deblk(struct au_vdir *vdir) -+{ -+ return vdir->vd_deblk[vdir->vd_nblk - 1]; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* estimate the appropriate size for name hash table */ -+unsigned int au_rdhash_est(loff_t sz) -+{ -+ unsigned int n; -+ -+ n = UINT_MAX; -+ sz >>= 10; -+ if (sz < n) -+ n = sz; -+ if (sz < AUFS_RDHASH_DEF) -+ n = AUFS_RDHASH_DEF; -+ /* pr_info("n %u\n", n); */ -+ return n; -+} -+ -+/* -+ * the allocated memory has to be freed by -+ * au_nhash_wh_free() or au_nhash_de_free(). -+ */ -+int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp) -+{ -+ struct hlist_head *head; -+ unsigned int u; -+ size_t sz; -+ -+ sz = sizeof(*nhash->nh_head) * num_hash; -+ head = kmalloc(sz, gfp); -+ if (head) { -+ nhash->nh_num = num_hash; -+ nhash->nh_head = head; -+ for (u = 0; u < num_hash; u++) -+ INIT_HLIST_HEAD(head++); -+ return 0; /* success */ -+ } -+ -+ return -ENOMEM; -+} -+ -+static void nhash_count(struct hlist_head *head) -+{ -+#if 0 -+ unsigned long n; -+ struct hlist_node *pos; -+ -+ n = 0; -+ hlist_for_each(pos, head) -+ n++; -+ pr_info("%lu\n", n); -+#endif -+} -+ -+static void au_nhash_wh_do_free(struct hlist_head *head) -+{ -+ struct au_vdir_wh *pos; -+ struct hlist_node *node; -+ -+ hlist_for_each_entry_safe(pos, node, head, wh_hash) -+ au_kfree_rcu(pos); -+} -+ -+static void au_nhash_de_do_free(struct hlist_head *head) -+{ -+ struct au_vdir_dehstr *pos; -+ struct hlist_node *node; -+ -+ hlist_for_each_entry_safe(pos, node, head, hash) -+ au_cache_free_vdir_dehstr(pos); -+} -+ -+static void au_nhash_do_free(struct au_nhash *nhash, -+ void (*free)(struct hlist_head *head)) -+{ -+ unsigned int n; -+ struct hlist_head *head; -+ -+ n = nhash->nh_num; -+ if (!n) -+ return; -+ -+ head = nhash->nh_head; -+ while (n-- > 0) { -+ nhash_count(head); -+ free(head++); -+ } -+ au_kfree_try_rcu(nhash->nh_head); -+} -+ -+void au_nhash_wh_free(struct au_nhash *whlist) -+{ -+ au_nhash_do_free(whlist, au_nhash_wh_do_free); -+} -+ -+static void au_nhash_de_free(struct au_nhash *delist) -+{ -+ au_nhash_do_free(delist, au_nhash_de_do_free); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt, -+ int limit) -+{ -+ int num; -+ unsigned int u, n; -+ struct hlist_head *head; -+ struct au_vdir_wh *pos; -+ -+ num = 0; -+ n = whlist->nh_num; -+ head = whlist->nh_head; -+ for (u = 0; u < n; u++, head++) -+ hlist_for_each_entry(pos, head, wh_hash) -+ if (pos->wh_bindex == btgt && ++num > limit) -+ return 1; -+ return 0; -+} -+ -+static struct hlist_head *au_name_hash(struct au_nhash *nhash, -+ unsigned char *name, -+ unsigned int len) -+{ -+ unsigned int v; -+ /* const unsigned int magic_bit = 12; */ -+ -+ AuDebugOn(!nhash->nh_num || !nhash->nh_head); -+ -+ v = 0; -+ if (len > 8) -+ len = 8; -+ while (len--) -+ v += *name++; -+ /* v = hash_long(v, magic_bit); */ -+ v %= nhash->nh_num; -+ return nhash->nh_head + v; -+} -+ -+static int au_nhash_test_name(struct au_vdir_destr *str, const char *name, -+ int nlen) -+{ -+ return str->len == nlen && !memcmp(str->name, name, nlen); -+} -+ -+/* returns found or not */ -+int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen) -+{ -+ struct hlist_head *head; -+ struct au_vdir_wh *pos; -+ struct au_vdir_destr *str; -+ -+ head = au_name_hash(whlist, name, nlen); -+ hlist_for_each_entry(pos, head, wh_hash) { -+ str = &pos->wh_str; -+ AuDbg("%.*s\n", str->len, str->name); -+ if (au_nhash_test_name(str, name, nlen)) -+ return 1; -+ } -+ return 0; -+} -+ -+/* returns found(true) or not */ -+static int test_known(struct au_nhash *delist, char *name, int nlen) -+{ -+ struct hlist_head *head; -+ struct au_vdir_dehstr *pos; -+ struct au_vdir_destr *str; -+ -+ head = au_name_hash(delist, name, nlen); -+ hlist_for_each_entry(pos, head, hash) { -+ str = pos->str; -+ AuDbg("%.*s\n", str->len, str->name); -+ if (au_nhash_test_name(str, name, nlen)) -+ return 1; -+ } -+ return 0; -+} -+ -+static void au_shwh_init_wh(struct au_vdir_wh *wh, ino_t ino, -+ unsigned char d_type) -+{ -+#ifdef CONFIG_AUFS_SHWH -+ wh->wh_ino = ino; -+ wh->wh_type = d_type; -+#endif -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino, -+ unsigned int d_type, aufs_bindex_t bindex, -+ unsigned char shwh) -+{ -+ int err; -+ struct au_vdir_destr *str; -+ struct au_vdir_wh *wh; -+ -+ AuDbg("%.*s\n", nlen, name); -+ AuDebugOn(!whlist->nh_num || !whlist->nh_head); -+ -+ err = -ENOMEM; -+ wh = kmalloc(sizeof(*wh) + nlen, GFP_NOFS); -+ if (unlikely(!wh)) -+ goto out; -+ -+ err = 0; -+ wh->wh_bindex = bindex; -+ if (shwh) -+ au_shwh_init_wh(wh, ino, d_type); -+ str = &wh->wh_str; -+ str->len = nlen; -+ memcpy(str->name, name, nlen); -+ hlist_add_head(&wh->wh_hash, au_name_hash(whlist, name, nlen)); -+ /* smp_mb(); */ -+ -+out: -+ return err; -+} -+ -+static int append_deblk(struct au_vdir *vdir) -+{ -+ int err; -+ unsigned long ul; -+ const unsigned int deblk_sz = vdir->vd_deblk_sz; -+ union au_vdir_deblk_p p, deblk_end; -+ unsigned char **o; -+ -+ err = -ENOMEM; -+ o = au_krealloc(vdir->vd_deblk, sizeof(*o) * (vdir->vd_nblk + 1), -+ GFP_NOFS, /*may_shrink*/0); -+ if (unlikely(!o)) -+ goto out; -+ -+ vdir->vd_deblk = o; -+ p.deblk = kmalloc(deblk_sz, GFP_NOFS); -+ if (p.deblk) { -+ ul = vdir->vd_nblk++; -+ vdir->vd_deblk[ul] = p.deblk; -+ vdir->vd_last.ul = ul; -+ vdir->vd_last.p.deblk = p.deblk; -+ deblk_end.deblk = p.deblk + deblk_sz; -+ err = set_deblk_end(&p, &deblk_end); -+ } -+ -+out: -+ return err; -+} -+ -+static int append_de(struct au_vdir *vdir, char *name, int nlen, ino_t ino, -+ unsigned int d_type, struct au_nhash *delist) -+{ -+ int err; -+ unsigned int sz; -+ const unsigned int deblk_sz = vdir->vd_deblk_sz; -+ union au_vdir_deblk_p p, *room, deblk_end; -+ struct au_vdir_dehstr *dehstr; -+ -+ p.deblk = last_deblk(vdir); -+ deblk_end.deblk = p.deblk + deblk_sz; -+ room = &vdir->vd_last.p; -+ AuDebugOn(room->deblk < p.deblk || deblk_end.deblk <= room->deblk -+ || !is_deblk_end(room, &deblk_end)); -+ -+ sz = calc_size(nlen); -+ if (unlikely(sz > deblk_end.deblk - room->deblk)) { -+ err = append_deblk(vdir); -+ if (unlikely(err)) -+ goto out; -+ -+ p.deblk = last_deblk(vdir); -+ deblk_end.deblk = p.deblk + deblk_sz; -+ /* smp_mb(); */ -+ AuDebugOn(room->deblk != p.deblk); -+ } -+ -+ err = -ENOMEM; -+ dehstr = au_cache_alloc_vdir_dehstr(); -+ if (unlikely(!dehstr)) -+ goto out; -+ -+ dehstr->str = &room->de->de_str; -+ hlist_add_head(&dehstr->hash, au_name_hash(delist, name, nlen)); -+ room->de->de_ino = ino; -+ room->de->de_type = d_type; -+ room->de->de_str.len = nlen; -+ memcpy(room->de->de_str.name, name, nlen); -+ -+ err = 0; -+ room->deblk += sz; -+ if (unlikely(set_deblk_end(room, &deblk_end))) -+ err = append_deblk(vdir); -+ /* smp_mb(); */ -+ -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+void au_vdir_free(struct au_vdir *vdir) -+{ -+ unsigned char **deblk; -+ -+ deblk = vdir->vd_deblk; -+ while (vdir->vd_nblk--) -+ au_kfree_try_rcu(*deblk++); -+ au_kfree_try_rcu(vdir->vd_deblk); -+ au_cache_free_vdir(vdir); -+} -+ -+static struct au_vdir *alloc_vdir(struct file *file) -+{ -+ struct au_vdir *vdir; -+ struct super_block *sb; -+ int err; -+ -+ sb = file->f_path.dentry->d_sb; -+ SiMustAnyLock(sb); -+ -+ err = -ENOMEM; -+ vdir = au_cache_alloc_vdir(); -+ if (unlikely(!vdir)) -+ goto out; -+ -+ vdir->vd_deblk = kzalloc(sizeof(*vdir->vd_deblk), GFP_NOFS); -+ if (unlikely(!vdir->vd_deblk)) -+ goto out_free; -+ -+ vdir->vd_deblk_sz = au_sbi(sb)->si_rdblk; -+ if (!vdir->vd_deblk_sz) { -+ /* estimate the appropriate size for deblk */ -+ vdir->vd_deblk_sz = au_dir_size(file, /*dentry*/NULL); -+ /* pr_info("vd_deblk_sz %u\n", vdir->vd_deblk_sz); */ -+ } -+ vdir->vd_nblk = 0; -+ vdir->vd_version = 0; -+ vdir->vd_jiffy = 0; -+ err = append_deblk(vdir); -+ if (!err) -+ return vdir; /* success */ -+ -+ au_kfree_try_rcu(vdir->vd_deblk); -+ -+out_free: -+ au_cache_free_vdir(vdir); -+out: -+ vdir = ERR_PTR(err); -+ return vdir; -+} -+ -+static int reinit_vdir(struct au_vdir *vdir) -+{ -+ int err; -+ union au_vdir_deblk_p p, deblk_end; -+ -+ while (vdir->vd_nblk > 1) { -+ au_kfree_try_rcu(vdir->vd_deblk[vdir->vd_nblk - 1]); -+ /* vdir->vd_deblk[vdir->vd_nblk - 1] = NULL; */ -+ vdir->vd_nblk--; -+ } -+ p.deblk = vdir->vd_deblk[0]; -+ deblk_end.deblk = p.deblk + vdir->vd_deblk_sz; -+ err = set_deblk_end(&p, &deblk_end); -+ /* keep vd_dblk_sz */ -+ vdir->vd_last.ul = 0; -+ vdir->vd_last.p.deblk = vdir->vd_deblk[0]; -+ vdir->vd_version = 0; -+ vdir->vd_jiffy = 0; -+ /* smp_mb(); */ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+#define AuFillVdir_CALLED 1 -+#define AuFillVdir_WHABLE (1 << 1) -+#define AuFillVdir_SHWH (1 << 2) -+#define au_ftest_fillvdir(flags, name) ((flags) & AuFillVdir_##name) -+#define au_fset_fillvdir(flags, name) \ -+ do { (flags) |= AuFillVdir_##name; } while (0) -+#define au_fclr_fillvdir(flags, name) \ -+ do { (flags) &= ~AuFillVdir_##name; } while (0) -+ -+#ifndef CONFIG_AUFS_SHWH -+#undef AuFillVdir_SHWH -+#define AuFillVdir_SHWH 0 -+#endif -+ -+struct fillvdir_arg { -+ struct dir_context ctx; -+ struct file *file; -+ struct au_vdir *vdir; -+ struct au_nhash delist; -+ struct au_nhash whlist; -+ aufs_bindex_t bindex; -+ unsigned int flags; -+ int err; -+}; -+ -+static int fillvdir(struct dir_context *ctx, const char *__name, int nlen, -+ loff_t offset __maybe_unused, u64 h_ino, -+ unsigned int d_type) -+{ -+ struct fillvdir_arg *arg = container_of(ctx, struct fillvdir_arg, ctx); -+ char *name = (void *)__name; -+ struct super_block *sb; -+ ino_t ino; -+ const unsigned char shwh = !!au_ftest_fillvdir(arg->flags, SHWH); -+ -+ arg->err = 0; -+ sb = arg->file->f_path.dentry->d_sb; -+ au_fset_fillvdir(arg->flags, CALLED); -+ /* smp_mb(); */ -+ if (nlen <= AUFS_WH_PFX_LEN -+ || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { -+ if (test_known(&arg->delist, name, nlen) -+ || au_nhash_test_known_wh(&arg->whlist, name, nlen)) -+ goto out; /* already exists or whiteouted */ -+ -+ arg->err = au_ino(sb, arg->bindex, h_ino, d_type, &ino); -+ if (!arg->err) { -+ if (unlikely(nlen > AUFS_MAX_NAMELEN)) -+ d_type = DT_UNKNOWN; -+ arg->err = append_de(arg->vdir, name, nlen, ino, -+ d_type, &arg->delist); -+ } -+ } else if (au_ftest_fillvdir(arg->flags, WHABLE)) { -+ name += AUFS_WH_PFX_LEN; -+ nlen -= AUFS_WH_PFX_LEN; -+ if (au_nhash_test_known_wh(&arg->whlist, name, nlen)) -+ goto out; /* already whiteouted */ -+ -+ ino = 0; /* just to suppress a warning */ -+ if (shwh) -+ arg->err = au_wh_ino(sb, arg->bindex, h_ino, d_type, -+ &ino); -+ if (!arg->err) { -+ if (nlen <= AUFS_MAX_NAMELEN + AUFS_WH_PFX_LEN) -+ d_type = DT_UNKNOWN; -+ arg->err = au_nhash_append_wh -+ (&arg->whlist, name, nlen, ino, d_type, -+ arg->bindex, shwh); -+ } -+ } -+ -+out: -+ if (!arg->err) -+ arg->vdir->vd_jiffy = jiffies; -+ /* smp_mb(); */ -+ AuTraceErr(arg->err); -+ return arg->err; -+} -+ -+static int au_handle_shwh(struct super_block *sb, struct au_vdir *vdir, -+ struct au_nhash *whlist, struct au_nhash *delist) -+{ -+#ifdef CONFIG_AUFS_SHWH -+ int err; -+ unsigned int nh, u; -+ struct hlist_head *head; -+ struct au_vdir_wh *pos; -+ struct hlist_node *n; -+ char *p, *o; -+ struct au_vdir_destr *destr; -+ -+ AuDebugOn(!au_opt_test(au_mntflags(sb), SHWH)); -+ -+ err = -ENOMEM; -+ o = p = (void *)__get_free_page(GFP_NOFS); -+ if (unlikely(!p)) -+ goto out; -+ -+ err = 0; -+ nh = whlist->nh_num; -+ memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); -+ p += AUFS_WH_PFX_LEN; -+ for (u = 0; u < nh; u++) { -+ head = whlist->nh_head + u; -+ hlist_for_each_entry_safe(pos, n, head, wh_hash) { -+ destr = &pos->wh_str; -+ memcpy(p, destr->name, destr->len); -+ err = append_de(vdir, o, destr->len + AUFS_WH_PFX_LEN, -+ pos->wh_ino, pos->wh_type, delist); -+ if (unlikely(err)) -+ break; -+ } -+ } -+ -+ free_page((unsigned long)o); -+ -+out: -+ AuTraceErr(err); -+ return err; -+#else -+ return 0; -+#endif -+} -+ -+static int au_do_read_vdir(struct fillvdir_arg *arg) -+{ -+ int err; -+ unsigned int rdhash; -+ loff_t offset; -+ aufs_bindex_t bbot, bindex, btop; -+ unsigned char shwh; -+ struct file *hf, *file; -+ struct super_block *sb; -+ -+ file = arg->file; -+ sb = file->f_path.dentry->d_sb; -+ SiMustAnyLock(sb); -+ -+ rdhash = au_sbi(sb)->si_rdhash; -+ if (!rdhash) -+ rdhash = au_rdhash_est(au_dir_size(file, /*dentry*/NULL)); -+ err = au_nhash_alloc(&arg->delist, rdhash, GFP_NOFS); -+ if (unlikely(err)) -+ goto out; -+ err = au_nhash_alloc(&arg->whlist, rdhash, GFP_NOFS); -+ if (unlikely(err)) -+ goto out_delist; -+ -+ err = 0; -+ arg->flags = 0; -+ shwh = 0; -+ if (au_opt_test(au_mntflags(sb), SHWH)) { -+ shwh = 1; -+ au_fset_fillvdir(arg->flags, SHWH); -+ } -+ btop = au_fbtop(file); -+ bbot = au_fbbot_dir(file); -+ for (bindex = btop; !err && bindex <= bbot; bindex++) { -+ hf = au_hf_dir(file, bindex); -+ if (!hf) -+ continue; -+ -+ offset = vfsub_llseek(hf, 0, SEEK_SET); -+ err = offset; -+ if (unlikely(offset)) -+ break; -+ -+ arg->bindex = bindex; -+ au_fclr_fillvdir(arg->flags, WHABLE); -+ if (shwh -+ || (bindex != bbot -+ && au_br_whable(au_sbr_perm(sb, bindex)))) -+ au_fset_fillvdir(arg->flags, WHABLE); -+ do { -+ arg->err = 0; -+ au_fclr_fillvdir(arg->flags, CALLED); -+ /* smp_mb(); */ -+ err = vfsub_iterate_dir(hf, &arg->ctx); -+ if (err >= 0) -+ err = arg->err; -+ } while (!err && au_ftest_fillvdir(arg->flags, CALLED)); -+ -+ /* -+ * dir_relax() may be good for concurrency, but aufs should not -+ * use it since it will cause a lockdep problem. -+ */ -+ } -+ -+ if (!err && shwh) -+ err = au_handle_shwh(sb, arg->vdir, &arg->whlist, &arg->delist); -+ -+ au_nhash_wh_free(&arg->whlist); -+ -+out_delist: -+ au_nhash_de_free(&arg->delist); -+out: -+ return err; -+} -+ -+static int read_vdir(struct file *file, int may_read) -+{ -+ int err; -+ unsigned long expire; -+ unsigned char do_read; -+ struct fillvdir_arg arg = { -+ .ctx = { -+ .actor = fillvdir -+ } -+ }; -+ struct inode *inode; -+ struct au_vdir *vdir, *allocated; -+ -+ err = 0; -+ inode = file_inode(file); -+ IMustLock(inode); -+ IiMustWriteLock(inode); -+ SiMustAnyLock(inode->i_sb); -+ -+ allocated = NULL; -+ do_read = 0; -+ expire = au_sbi(inode->i_sb)->si_rdcache; -+ vdir = au_ivdir(inode); -+ if (!vdir) { -+ do_read = 1; -+ vdir = alloc_vdir(file); -+ err = PTR_ERR(vdir); -+ if (IS_ERR(vdir)) -+ goto out; -+ err = 0; -+ allocated = vdir; -+ } else if (may_read -+ && (!inode_eq_iversion(inode, vdir->vd_version) -+ || time_after(jiffies, vdir->vd_jiffy + expire))) { -+ do_read = 1; -+ err = reinit_vdir(vdir); -+ if (unlikely(err)) -+ goto out; -+ } -+ -+ if (!do_read) -+ return 0; /* success */ -+ -+ arg.file = file; -+ arg.vdir = vdir; -+ err = au_do_read_vdir(&arg); -+ if (!err) { -+ /* file->f_pos = 0; */ /* todo: ctx->pos? */ -+ vdir->vd_version = inode_query_iversion(inode); -+ vdir->vd_last.ul = 0; -+ vdir->vd_last.p.deblk = vdir->vd_deblk[0]; -+ if (allocated) -+ au_set_ivdir(inode, allocated); -+ } else if (allocated) -+ au_vdir_free(allocated); -+ -+out: -+ return err; -+} -+ -+static int copy_vdir(struct au_vdir *tgt, struct au_vdir *src) -+{ -+ int err, rerr; -+ unsigned long ul, n; -+ const unsigned int deblk_sz = src->vd_deblk_sz; -+ -+ AuDebugOn(tgt->vd_nblk != 1); -+ -+ err = -ENOMEM; -+ if (tgt->vd_nblk < src->vd_nblk) { -+ unsigned char **p; -+ -+ p = au_krealloc(tgt->vd_deblk, sizeof(*p) * src->vd_nblk, -+ GFP_NOFS, /*may_shrink*/0); -+ if (unlikely(!p)) -+ goto out; -+ tgt->vd_deblk = p; -+ } -+ -+ if (tgt->vd_deblk_sz != deblk_sz) { -+ unsigned char *p; -+ -+ tgt->vd_deblk_sz = deblk_sz; -+ p = au_krealloc(tgt->vd_deblk[0], deblk_sz, GFP_NOFS, -+ /*may_shrink*/1); -+ if (unlikely(!p)) -+ goto out; -+ tgt->vd_deblk[0] = p; -+ } -+ memcpy(tgt->vd_deblk[0], src->vd_deblk[0], deblk_sz); -+ tgt->vd_version = src->vd_version; -+ tgt->vd_jiffy = src->vd_jiffy; -+ -+ n = src->vd_nblk; -+ for (ul = 1; ul < n; ul++) { -+ tgt->vd_deblk[ul] = kmemdup(src->vd_deblk[ul], deblk_sz, -+ GFP_NOFS); -+ if (unlikely(!tgt->vd_deblk[ul])) -+ goto out; -+ tgt->vd_nblk++; -+ } -+ tgt->vd_nblk = n; -+ tgt->vd_last.ul = tgt->vd_last.ul; -+ tgt->vd_last.p.deblk = tgt->vd_deblk[tgt->vd_last.ul]; -+ tgt->vd_last.p.deblk += src->vd_last.p.deblk -+ - src->vd_deblk[src->vd_last.ul]; -+ /* smp_mb(); */ -+ return 0; /* success */ -+ -+out: -+ rerr = reinit_vdir(tgt); -+ BUG_ON(rerr); -+ return err; -+} -+ -+int au_vdir_init(struct file *file) -+{ -+ int err; -+ struct inode *inode; -+ struct au_vdir *vdir_cache, *allocated; -+ -+ /* test file->f_pos here instead of ctx->pos */ -+ err = read_vdir(file, !file->f_pos); -+ if (unlikely(err)) -+ goto out; -+ -+ allocated = NULL; -+ vdir_cache = au_fvdir_cache(file); -+ if (!vdir_cache) { -+ vdir_cache = alloc_vdir(file); -+ err = PTR_ERR(vdir_cache); -+ if (IS_ERR(vdir_cache)) -+ goto out; -+ allocated = vdir_cache; -+ } else if (!file->f_pos && vdir_cache->vd_version != file->f_version) { -+ /* test file->f_pos here instead of ctx->pos */ -+ err = reinit_vdir(vdir_cache); -+ if (unlikely(err)) -+ goto out; -+ } else -+ return 0; /* success */ -+ -+ inode = file_inode(file); -+ err = copy_vdir(vdir_cache, au_ivdir(inode)); -+ if (!err) { -+ file->f_version = inode_query_iversion(inode); -+ if (allocated) -+ au_set_fvdir_cache(file, allocated); -+ } else if (allocated) -+ au_vdir_free(allocated); -+ -+out: -+ return err; -+} -+ -+static loff_t calc_offset(struct au_vdir *vdir) -+{ -+ loff_t offset; -+ union au_vdir_deblk_p p; -+ -+ p.deblk = vdir->vd_deblk[vdir->vd_last.ul]; -+ offset = vdir->vd_last.p.deblk - p.deblk; -+ offset += vdir->vd_deblk_sz * vdir->vd_last.ul; -+ return offset; -+} -+ -+/* returns true or false */ -+static int seek_vdir(struct file *file, struct dir_context *ctx) -+{ -+ int valid; -+ unsigned int deblk_sz; -+ unsigned long ul, n; -+ loff_t offset; -+ union au_vdir_deblk_p p, deblk_end; -+ struct au_vdir *vdir_cache; -+ -+ valid = 1; -+ vdir_cache = au_fvdir_cache(file); -+ offset = calc_offset(vdir_cache); -+ AuDbg("offset %lld\n", offset); -+ if (ctx->pos == offset) -+ goto out; -+ -+ vdir_cache->vd_last.ul = 0; -+ vdir_cache->vd_last.p.deblk = vdir_cache->vd_deblk[0]; -+ if (!ctx->pos) -+ goto out; -+ -+ valid = 0; -+ deblk_sz = vdir_cache->vd_deblk_sz; -+ ul = div64_u64(ctx->pos, deblk_sz); -+ AuDbg("ul %lu\n", ul); -+ if (ul >= vdir_cache->vd_nblk) -+ goto out; -+ -+ n = vdir_cache->vd_nblk; -+ for (; ul < n; ul++) { -+ p.deblk = vdir_cache->vd_deblk[ul]; -+ deblk_end.deblk = p.deblk + deblk_sz; -+ offset = ul; -+ offset *= deblk_sz; -+ while (!is_deblk_end(&p, &deblk_end) && offset < ctx->pos) { -+ unsigned int l; -+ -+ l = calc_size(p.de->de_str.len); -+ offset += l; -+ p.deblk += l; -+ } -+ if (!is_deblk_end(&p, &deblk_end)) { -+ valid = 1; -+ vdir_cache->vd_last.ul = ul; -+ vdir_cache->vd_last.p = p; -+ break; -+ } -+ } -+ -+out: -+ /* smp_mb(); */ -+ if (!valid) -+ AuDbg("valid %d\n", !valid); -+ return valid; -+} -+ -+int au_vdir_fill_de(struct file *file, struct dir_context *ctx) -+{ -+ unsigned int l, deblk_sz; -+ union au_vdir_deblk_p deblk_end; -+ struct au_vdir *vdir_cache; -+ struct au_vdir_de *de; -+ -+ if (!seek_vdir(file, ctx)) -+ return 0; -+ -+ vdir_cache = au_fvdir_cache(file); -+ deblk_sz = vdir_cache->vd_deblk_sz; -+ while (1) { -+ deblk_end.deblk = vdir_cache->vd_deblk[vdir_cache->vd_last.ul]; -+ deblk_end.deblk += deblk_sz; -+ while (!is_deblk_end(&vdir_cache->vd_last.p, &deblk_end)) { -+ de = vdir_cache->vd_last.p.de; -+ AuDbg("%.*s, off%lld, i%lu, dt%d\n", -+ de->de_str.len, de->de_str.name, ctx->pos, -+ (unsigned long)de->de_ino, de->de_type); -+ if (unlikely(!dir_emit(ctx, de->de_str.name, -+ de->de_str.len, de->de_ino, -+ de->de_type))) { -+ /* todo: ignore the error caused by udba? */ -+ /* return err; */ -+ return 0; -+ } -+ -+ l = calc_size(de->de_str.len); -+ vdir_cache->vd_last.p.deblk += l; -+ ctx->pos += l; -+ } -+ if (vdir_cache->vd_last.ul < vdir_cache->vd_nblk - 1) { -+ vdir_cache->vd_last.ul++; -+ vdir_cache->vd_last.p.deblk -+ = vdir_cache->vd_deblk[vdir_cache->vd_last.ul]; -+ ctx->pos = deblk_sz * vdir_cache->vd_last.ul; -+ continue; -+ } -+ break; -+ } -+ -+ /* smp_mb(); */ -+ return 0; -+} -diff --git a/fs/aufs/vfsub.c b/fs/aufs/vfsub.c -new file mode 100644 -index 000000000000..d6945e22593e ---- /dev/null -+++ b/fs/aufs/vfsub.c -@@ -0,0 +1,902 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * sub-routines for VFS -+ */ -+ -+#include <linux/mnt_namespace.h> -+#include <linux/namei.h> -+#include <linux/nsproxy.h> -+#include <linux/security.h> -+#include <linux/splice.h> -+#include "aufs.h" -+ -+#ifdef CONFIG_AUFS_BR_FUSE -+int vfsub_test_mntns(struct vfsmount *mnt, struct super_block *h_sb) -+{ -+ if (!au_test_fuse(h_sb) || !au_userns) -+ return 0; -+ -+ return is_current_mnt_ns(mnt) ? 0 : -EACCES; -+} -+#endif -+ -+int vfsub_sync_filesystem(struct super_block *h_sb, int wait) -+{ -+ int err; -+ -+ lockdep_off(); -+ down_read(&h_sb->s_umount); -+ err = __sync_filesystem(h_sb, wait); -+ up_read(&h_sb->s_umount); -+ lockdep_on(); -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int vfsub_update_h_iattr(struct path *h_path, int *did) -+{ -+ int err; -+ struct kstat st; -+ struct super_block *h_sb; -+ -+ /* for remote fs, leave work for its getattr or d_revalidate */ -+ /* for bad i_attr fs, handle them in aufs_getattr() */ -+ /* still some fs may acquire i_mutex. we need to skip them */ -+ err = 0; -+ if (!did) -+ did = &err; -+ h_sb = h_path->dentry->d_sb; -+ *did = (!au_test_fs_remote(h_sb) && au_test_fs_refresh_iattr(h_sb)); -+ if (*did) -+ err = vfsub_getattr(h_path, &st); -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct file *vfsub_dentry_open(struct path *path, int flags) -+{ -+ struct file *file; -+ -+ file = dentry_open(path, flags /* | __FMODE_NONOTIFY */, -+ current_cred()); -+ if (!IS_ERR_OR_NULL(file) -+ && (file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) -+ i_readcount_inc(d_inode(path->dentry)); -+ -+ return file; -+} -+ -+struct file *vfsub_filp_open(const char *path, int oflags, int mode) -+{ -+ struct file *file; -+ -+ lockdep_off(); -+ file = filp_open(path, -+ oflags /* | __FMODE_NONOTIFY */, -+ mode); -+ lockdep_on(); -+ if (IS_ERR(file)) -+ goto out; -+ vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ -+ -+out: -+ return file; -+} -+ -+/* -+ * Ideally this function should call VFS:do_last() in order to keep all its -+ * checkings. But it is very hard for aufs to regenerate several VFS internal -+ * structure such as nameidata. This is a second (or third) best approach. -+ * cf. linux/fs/namei.c:do_last(), lookup_open() and atomic_open(). -+ */ -+int vfsub_atomic_open(struct inode *dir, struct dentry *dentry, -+ struct vfsub_aopen_args *args) -+{ -+ int err; -+ struct au_branch *br = args->br; -+ struct file *file = args->file; -+ /* copied from linux/fs/namei.c:atomic_open() */ -+ struct dentry *const DENTRY_NOT_SET = (void *)-1UL; -+ -+ IMustLock(dir); -+ AuDebugOn(!dir->i_op->atomic_open); -+ -+ err = au_br_test_oflag(args->open_flag, br); -+ if (unlikely(err)) -+ goto out; -+ -+ au_lcnt_inc(&br->br_nfiles); -+ file->f_path.dentry = DENTRY_NOT_SET; -+ file->f_path.mnt = au_br_mnt(br); -+ AuDbg("%ps\n", dir->i_op->atomic_open); -+ err = dir->i_op->atomic_open(dir, dentry, file, args->open_flag, -+ args->create_mode); -+ if (unlikely(err < 0)) { -+ au_lcnt_dec(&br->br_nfiles); -+ goto out; -+ } -+ -+ /* temporary workaround for nfsv4 branch */ -+ if (au_test_nfs(dir->i_sb)) -+ nfs_mark_for_revalidate(dir); -+ -+ if (file->f_mode & FMODE_CREATED) -+ fsnotify_create(dir, dentry); -+ if (!(file->f_mode & FMODE_OPENED)) { -+ au_lcnt_dec(&br->br_nfiles); -+ goto out; -+ } -+ -+ /* todo: call VFS:may_open() here */ -+ /* todo: ima_file_check() too? */ -+ if (!err && (args->open_flag & __FMODE_EXEC)) -+ err = deny_write_access(file); -+ if (!err) -+ fsnotify_open(file); -+ else -+ au_lcnt_dec(&br->br_nfiles); -+ /* note that the file is created and still opened */ -+ -+out: -+ return err; -+} -+ -+int vfsub_kern_path(const char *name, unsigned int flags, struct path *path) -+{ -+ int err; -+ -+ err = kern_path(name, flags, path); -+ if (!err && d_is_positive(path->dentry)) -+ vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/ -+ return err; -+} -+ -+struct dentry *vfsub_lookup_one_len_unlocked(const char *name, -+ struct dentry *parent, int len) -+{ -+ struct path path = { -+ .mnt = NULL -+ }; -+ -+ path.dentry = lookup_one_len_unlocked(name, parent, len); -+ if (IS_ERR(path.dentry)) -+ goto out; -+ if (d_is_positive(path.dentry)) -+ vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/ -+ -+out: -+ AuTraceErrPtr(path.dentry); -+ return path.dentry; -+} -+ -+struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent, -+ int len) -+{ -+ struct path path = { -+ .mnt = NULL -+ }; -+ -+ /* VFS checks it too, but by WARN_ON_ONCE() */ -+ IMustLock(d_inode(parent)); -+ -+ path.dentry = lookup_one_len(name, parent, len); -+ if (IS_ERR(path.dentry)) -+ goto out; -+ if (d_is_positive(path.dentry)) -+ vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/ -+ -+out: -+ AuTraceErrPtr(path.dentry); -+ return path.dentry; -+} -+ -+void vfsub_call_lkup_one(void *args) -+{ -+ struct vfsub_lkup_one_args *a = args; -+ *a->errp = vfsub_lkup_one(a->name, a->parent); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1, -+ struct dentry *d2, struct au_hinode *hdir2) -+{ -+ struct dentry *d; -+ -+ lockdep_off(); -+ d = lock_rename(d1, d2); -+ lockdep_on(); -+ au_hn_suspend(hdir1); -+ if (hdir1 != hdir2) -+ au_hn_suspend(hdir2); -+ -+ return d; -+} -+ -+void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1, -+ struct dentry *d2, struct au_hinode *hdir2) -+{ -+ au_hn_resume(hdir1); -+ if (hdir1 != hdir2) -+ au_hn_resume(hdir2); -+ lockdep_off(); -+ unlock_rename(d1, d2); -+ lockdep_on(); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int vfsub_create(struct inode *dir, struct path *path, int mode, bool want_excl) -+{ -+ int err; -+ struct dentry *d; -+ -+ IMustLock(dir); -+ -+ d = path->dentry; -+ path->dentry = d->d_parent; -+ err = security_path_mknod(path, d, mode, 0); -+ path->dentry = d; -+ if (unlikely(err)) -+ goto out; -+ -+ lockdep_off(); -+ err = vfs_create(dir, path->dentry, mode, want_excl); -+ lockdep_on(); -+ if (!err) { -+ struct path tmp = *path; -+ int did; -+ -+ vfsub_update_h_iattr(&tmp, &did); -+ if (did) { -+ tmp.dentry = path->dentry->d_parent; -+ vfsub_update_h_iattr(&tmp, /*did*/NULL); -+ } -+ /*ignore*/ -+ } -+ -+out: -+ return err; -+} -+ -+int vfsub_symlink(struct inode *dir, struct path *path, const char *symname) -+{ -+ int err; -+ struct dentry *d; -+ -+ IMustLock(dir); -+ -+ d = path->dentry; -+ path->dentry = d->d_parent; -+ err = security_path_symlink(path, d, symname); -+ path->dentry = d; -+ if (unlikely(err)) -+ goto out; -+ -+ lockdep_off(); -+ err = vfs_symlink(dir, path->dentry, symname); -+ lockdep_on(); -+ if (!err) { -+ struct path tmp = *path; -+ int did; -+ -+ vfsub_update_h_iattr(&tmp, &did); -+ if (did) { -+ tmp.dentry = path->dentry->d_parent; -+ vfsub_update_h_iattr(&tmp, /*did*/NULL); -+ } -+ /*ignore*/ -+ } -+ -+out: -+ return err; -+} -+ -+int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev) -+{ -+ int err; -+ struct dentry *d; -+ -+ IMustLock(dir); -+ -+ d = path->dentry; -+ path->dentry = d->d_parent; -+ err = security_path_mknod(path, d, mode, new_encode_dev(dev)); -+ path->dentry = d; -+ if (unlikely(err)) -+ goto out; -+ -+ lockdep_off(); -+ err = vfs_mknod(dir, path->dentry, mode, dev); -+ lockdep_on(); -+ if (!err) { -+ struct path tmp = *path; -+ int did; -+ -+ vfsub_update_h_iattr(&tmp, &did); -+ if (did) { -+ tmp.dentry = path->dentry->d_parent; -+ vfsub_update_h_iattr(&tmp, /*did*/NULL); -+ } -+ /*ignore*/ -+ } -+ -+out: -+ return err; -+} -+ -+static int au_test_nlink(struct inode *inode) -+{ -+ const unsigned int link_max = UINT_MAX >> 1; /* rough margin */ -+ -+ if (!au_test_fs_no_limit_nlink(inode->i_sb) -+ || inode->i_nlink < link_max) -+ return 0; -+ return -EMLINK; -+} -+ -+int vfsub_link(struct dentry *src_dentry, struct inode *dir, struct path *path, -+ struct inode **delegated_inode) -+{ -+ int err; -+ struct dentry *d; -+ -+ IMustLock(dir); -+ -+ err = au_test_nlink(d_inode(src_dentry)); -+ if (unlikely(err)) -+ return err; -+ -+ /* we don't call may_linkat() */ -+ d = path->dentry; -+ path->dentry = d->d_parent; -+ err = security_path_link(src_dentry, path, d); -+ path->dentry = d; -+ if (unlikely(err)) -+ goto out; -+ -+ lockdep_off(); -+ err = vfs_link(src_dentry, dir, path->dentry, delegated_inode); -+ lockdep_on(); -+ if (!err) { -+ struct path tmp = *path; -+ int did; -+ -+ /* fuse has different memory inode for the same inumber */ -+ vfsub_update_h_iattr(&tmp, &did); -+ if (did) { -+ tmp.dentry = path->dentry->d_parent; -+ vfsub_update_h_iattr(&tmp, /*did*/NULL); -+ tmp.dentry = src_dentry; -+ vfsub_update_h_iattr(&tmp, /*did*/NULL); -+ } -+ /*ignore*/ -+ } -+ -+out: -+ return err; -+} -+ -+int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry, -+ struct inode *dir, struct path *path, -+ struct inode **delegated_inode, unsigned int flags) -+{ -+ int err; -+ struct path tmp = { -+ .mnt = path->mnt -+ }; -+ struct dentry *d; -+ -+ IMustLock(dir); -+ IMustLock(src_dir); -+ -+ d = path->dentry; -+ path->dentry = d->d_parent; -+ tmp.dentry = src_dentry->d_parent; -+ err = security_path_rename(&tmp, src_dentry, path, d, /*flags*/0); -+ path->dentry = d; -+ if (unlikely(err)) -+ goto out; -+ -+ lockdep_off(); -+ err = vfs_rename(src_dir, src_dentry, dir, path->dentry, -+ delegated_inode, flags); -+ lockdep_on(); -+ if (!err) { -+ int did; -+ -+ tmp.dentry = d->d_parent; -+ vfsub_update_h_iattr(&tmp, &did); -+ if (did) { -+ tmp.dentry = src_dentry; -+ vfsub_update_h_iattr(&tmp, /*did*/NULL); -+ tmp.dentry = src_dentry->d_parent; -+ vfsub_update_h_iattr(&tmp, /*did*/NULL); -+ } -+ /*ignore*/ -+ } -+ -+out: -+ return err; -+} -+ -+int vfsub_mkdir(struct inode *dir, struct path *path, int mode) -+{ -+ int err; -+ struct dentry *d; -+ -+ IMustLock(dir); -+ -+ d = path->dentry; -+ path->dentry = d->d_parent; -+ err = security_path_mkdir(path, d, mode); -+ path->dentry = d; -+ if (unlikely(err)) -+ goto out; -+ -+ lockdep_off(); -+ err = vfs_mkdir(dir, path->dentry, mode); -+ lockdep_on(); -+ if (!err) { -+ struct path tmp = *path; -+ int did; -+ -+ vfsub_update_h_iattr(&tmp, &did); -+ if (did) { -+ tmp.dentry = path->dentry->d_parent; -+ vfsub_update_h_iattr(&tmp, /*did*/NULL); -+ } -+ /*ignore*/ -+ } -+ -+out: -+ return err; -+} -+ -+int vfsub_rmdir(struct inode *dir, struct path *path) -+{ -+ int err; -+ struct dentry *d; -+ -+ IMustLock(dir); -+ -+ d = path->dentry; -+ path->dentry = d->d_parent; -+ err = security_path_rmdir(path, d); -+ path->dentry = d; -+ if (unlikely(err)) -+ goto out; -+ -+ lockdep_off(); -+ err = vfs_rmdir(dir, path->dentry); -+ lockdep_on(); -+ if (!err) { -+ struct path tmp = { -+ .dentry = path->dentry->d_parent, -+ .mnt = path->mnt -+ }; -+ -+ vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/ -+ } -+ -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* todo: support mmap_sem? */ -+ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count, -+ loff_t *ppos) -+{ -+ ssize_t err; -+ -+ lockdep_off(); -+ err = vfs_read(file, ubuf, count, ppos); -+ lockdep_on(); -+ if (err >= 0) -+ vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ -+ return err; -+} -+ -+/* todo: kernel_read()? */ -+ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, -+ loff_t *ppos) -+{ -+ ssize_t err; -+ mm_segment_t oldfs; -+ union { -+ void *k; -+ char __user *u; -+ } buf; -+ -+ buf.k = kbuf; -+ oldfs = get_fs(); -+ set_fs(KERNEL_DS); -+ err = vfsub_read_u(file, buf.u, count, ppos); -+ set_fs(oldfs); -+ return err; -+} -+ -+ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count, -+ loff_t *ppos) -+{ -+ ssize_t err; -+ -+ lockdep_off(); -+ err = vfs_write(file, ubuf, count, ppos); -+ lockdep_on(); -+ if (err >= 0) -+ vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ -+ return err; -+} -+ -+ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos) -+{ -+ ssize_t err; -+ mm_segment_t oldfs; -+ union { -+ void *k; -+ const char __user *u; -+ } buf; -+ -+ buf.k = kbuf; -+ oldfs = get_fs(); -+ set_fs(KERNEL_DS); -+ err = vfsub_write_u(file, buf.u, count, ppos); -+ set_fs(oldfs); -+ return err; -+} -+ -+int vfsub_flush(struct file *file, fl_owner_t id) -+{ -+ int err; -+ -+ err = 0; -+ if (file->f_op->flush) { -+ if (!au_test_nfs(file->f_path.dentry->d_sb)) -+ err = file->f_op->flush(file, id); -+ else { -+ lockdep_off(); -+ err = file->f_op->flush(file, id); -+ lockdep_on(); -+ } -+ if (!err) -+ vfsub_update_h_iattr(&file->f_path, /*did*/NULL); -+ /*ignore*/ -+ } -+ return err; -+} -+ -+int vfsub_iterate_dir(struct file *file, struct dir_context *ctx) -+{ -+ int err; -+ -+ AuDbg("%pD, ctx{%ps, %llu}\n", file, ctx->actor, ctx->pos); -+ -+ lockdep_off(); -+ err = iterate_dir(file, ctx); -+ lockdep_on(); -+ if (err >= 0) -+ vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ -+ -+ return err; -+} -+ -+long vfsub_splice_to(struct file *in, loff_t *ppos, -+ struct pipe_inode_info *pipe, size_t len, -+ unsigned int flags) -+{ -+ long err; -+ -+ lockdep_off(); -+ err = do_splice_to(in, ppos, pipe, len, flags); -+ lockdep_on(); -+ file_accessed(in); -+ if (err >= 0) -+ vfsub_update_h_iattr(&in->f_path, /*did*/NULL); /*ignore*/ -+ return err; -+} -+ -+long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out, -+ loff_t *ppos, size_t len, unsigned int flags) -+{ -+ long err; -+ -+ lockdep_off(); -+ err = do_splice_from(pipe, out, ppos, len, flags); -+ lockdep_on(); -+ if (err >= 0) -+ vfsub_update_h_iattr(&out->f_path, /*did*/NULL); /*ignore*/ -+ return err; -+} -+ -+int vfsub_fsync(struct file *file, struct path *path, int datasync) -+{ -+ int err; -+ -+ /* file can be NULL */ -+ lockdep_off(); -+ err = vfs_fsync(file, datasync); -+ lockdep_on(); -+ if (!err) { -+ if (!path) { -+ AuDebugOn(!file); -+ path = &file->f_path; -+ } -+ vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/ -+ } -+ return err; -+} -+ -+/* cf. open.c:do_sys_truncate() and do_sys_ftruncate() */ -+int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr, -+ struct file *h_file) -+{ -+ int err; -+ struct inode *h_inode; -+ struct super_block *h_sb; -+ -+ if (!h_file) { -+ err = vfsub_truncate(h_path, length); -+ goto out; -+ } -+ -+ h_inode = d_inode(h_path->dentry); -+ h_sb = h_inode->i_sb; -+ lockdep_off(); -+ sb_start_write(h_sb); -+ lockdep_on(); -+ err = locks_verify_truncate(h_inode, h_file, length); -+ if (!err) -+ err = security_path_truncate(h_path); -+ if (!err) { -+ lockdep_off(); -+ err = do_truncate(h_path->dentry, length, attr, h_file); -+ lockdep_on(); -+ } -+ lockdep_off(); -+ sb_end_write(h_sb); -+ lockdep_on(); -+ -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct au_vfsub_mkdir_args { -+ int *errp; -+ struct inode *dir; -+ struct path *path; -+ int mode; -+}; -+ -+static void au_call_vfsub_mkdir(void *args) -+{ -+ struct au_vfsub_mkdir_args *a = args; -+ *a->errp = vfsub_mkdir(a->dir, a->path, a->mode); -+} -+ -+int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode) -+{ -+ int err, do_sio, wkq_err; -+ -+ do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE); -+ if (!do_sio) { -+ lockdep_off(); -+ err = vfsub_mkdir(dir, path, mode); -+ lockdep_on(); -+ } else { -+ struct au_vfsub_mkdir_args args = { -+ .errp = &err, -+ .dir = dir, -+ .path = path, -+ .mode = mode -+ }; -+ wkq_err = au_wkq_wait(au_call_vfsub_mkdir, &args); -+ if (unlikely(wkq_err)) -+ err = wkq_err; -+ } -+ -+ return err; -+} -+ -+struct au_vfsub_rmdir_args { -+ int *errp; -+ struct inode *dir; -+ struct path *path; -+}; -+ -+static void au_call_vfsub_rmdir(void *args) -+{ -+ struct au_vfsub_rmdir_args *a = args; -+ *a->errp = vfsub_rmdir(a->dir, a->path); -+} -+ -+int vfsub_sio_rmdir(struct inode *dir, struct path *path) -+{ -+ int err, do_sio, wkq_err; -+ -+ do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE); -+ if (!do_sio) { -+ lockdep_off(); -+ err = vfsub_rmdir(dir, path); -+ lockdep_on(); -+ } else { -+ struct au_vfsub_rmdir_args args = { -+ .errp = &err, -+ .dir = dir, -+ .path = path -+ }; -+ wkq_err = au_wkq_wait(au_call_vfsub_rmdir, &args); -+ if (unlikely(wkq_err)) -+ err = wkq_err; -+ } -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct notify_change_args { -+ int *errp; -+ struct path *path; -+ struct iattr *ia; -+ struct inode **delegated_inode; -+}; -+ -+static void call_notify_change(void *args) -+{ -+ struct notify_change_args *a = args; -+ struct inode *h_inode; -+ -+ h_inode = d_inode(a->path->dentry); -+ IMustLock(h_inode); -+ -+ *a->errp = -EPERM; -+ if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) { -+ lockdep_off(); -+ *a->errp = notify_change(a->path->dentry, a->ia, -+ a->delegated_inode); -+ lockdep_on(); -+ if (!*a->errp) -+ vfsub_update_h_iattr(a->path, /*did*/NULL); /*ignore*/ -+ } -+ AuTraceErr(*a->errp); -+} -+ -+int vfsub_notify_change(struct path *path, struct iattr *ia, -+ struct inode **delegated_inode) -+{ -+ int err; -+ struct notify_change_args args = { -+ .errp = &err, -+ .path = path, -+ .ia = ia, -+ .delegated_inode = delegated_inode -+ }; -+ -+ call_notify_change(&args); -+ -+ return err; -+} -+ -+int vfsub_sio_notify_change(struct path *path, struct iattr *ia, -+ struct inode **delegated_inode) -+{ -+ int err, wkq_err; -+ struct notify_change_args args = { -+ .errp = &err, -+ .path = path, -+ .ia = ia, -+ .delegated_inode = delegated_inode -+ }; -+ -+ wkq_err = au_wkq_wait(call_notify_change, &args); -+ if (unlikely(wkq_err)) -+ err = wkq_err; -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct unlink_args { -+ int *errp; -+ struct inode *dir; -+ struct path *path; -+ struct inode **delegated_inode; -+}; -+ -+static void call_unlink(void *args) -+{ -+ struct unlink_args *a = args; -+ struct dentry *d = a->path->dentry; -+ struct inode *h_inode; -+ const int stop_sillyrename = (au_test_nfs(d->d_sb) -+ && au_dcount(d) == 1); -+ -+ IMustLock(a->dir); -+ -+ a->path->dentry = d->d_parent; -+ *a->errp = security_path_unlink(a->path, d); -+ a->path->dentry = d; -+ if (unlikely(*a->errp)) -+ return; -+ -+ if (!stop_sillyrename) -+ dget(d); -+ h_inode = NULL; -+ if (d_is_positive(d)) { -+ h_inode = d_inode(d); -+ ihold(h_inode); -+ } -+ -+ lockdep_off(); -+ *a->errp = vfs_unlink(a->dir, d, a->delegated_inode); -+ lockdep_on(); -+ if (!*a->errp) { -+ struct path tmp = { -+ .dentry = d->d_parent, -+ .mnt = a->path->mnt -+ }; -+ vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/ -+ } -+ -+ if (!stop_sillyrename) -+ dput(d); -+ if (h_inode) -+ iput(h_inode); -+ -+ AuTraceErr(*a->errp); -+} -+ -+/* -+ * @dir: must be locked. -+ * @dentry: target dentry. -+ */ -+int vfsub_unlink(struct inode *dir, struct path *path, -+ struct inode **delegated_inode, int force) -+{ -+ int err; -+ struct unlink_args args = { -+ .errp = &err, -+ .dir = dir, -+ .path = path, -+ .delegated_inode = delegated_inode -+ }; -+ -+ if (!force) -+ call_unlink(&args); -+ else { -+ int wkq_err; -+ -+ wkq_err = au_wkq_wait(call_unlink, &args); -+ if (unlikely(wkq_err)) -+ err = wkq_err; -+ } -+ -+ return err; -+} -diff --git a/fs/aufs/vfsub.h b/fs/aufs/vfsub.h -new file mode 100644 -index 000000000000..51e677c7f6b7 ---- /dev/null -+++ b/fs/aufs/vfsub.h -@@ -0,0 +1,354 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * sub-routines for VFS -+ */ -+ -+#ifndef __AUFS_VFSUB_H__ -+#define __AUFS_VFSUB_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/fs.h> -+#include <linux/mount.h> -+#include <linux/posix_acl.h> -+#include <linux/xattr.h> -+#include "debug.h" -+ -+/* copied from linux/fs/internal.h */ -+/* todo: BAD approach!! */ -+extern void __mnt_drop_write(struct vfsmount *); -+extern struct file *alloc_empty_file(int, const struct cred *); -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* lock subclass for lower inode */ -+/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */ -+/* reduce? gave up. */ -+enum { -+ AuLsc_I_Begin = I_MUTEX_PARENT2, /* 5 */ -+ AuLsc_I_PARENT, /* lower inode, parent first */ -+ AuLsc_I_PARENT2, /* copyup dirs */ -+ AuLsc_I_PARENT3, /* copyup wh */ -+ AuLsc_I_CHILD, -+ AuLsc_I_CHILD2, -+ AuLsc_I_End -+}; -+ -+/* to debug easier, do not make them inlined functions */ -+#define MtxMustLock(mtx) AuDebugOn(!mutex_is_locked(mtx)) -+#define IMustLock(i) AuDebugOn(!inode_is_locked(i)) -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline void vfsub_drop_nlink(struct inode *inode) -+{ -+ AuDebugOn(!inode->i_nlink); -+ drop_nlink(inode); -+} -+ -+static inline void vfsub_dead_dir(struct inode *inode) -+{ -+ AuDebugOn(!S_ISDIR(inode->i_mode)); -+ inode->i_flags |= S_DEAD; -+ clear_nlink(inode); -+} -+ -+static inline int vfsub_native_ro(struct inode *inode) -+{ -+ return sb_rdonly(inode->i_sb) -+ || IS_RDONLY(inode) -+ /* || IS_APPEND(inode) */ -+ || IS_IMMUTABLE(inode); -+} -+ -+#ifdef CONFIG_AUFS_BR_FUSE -+int vfsub_test_mntns(struct vfsmount *mnt, struct super_block *h_sb); -+#else -+AuStubInt0(vfsub_test_mntns, struct vfsmount *mnt, struct super_block *h_sb); -+#endif -+ -+int vfsub_sync_filesystem(struct super_block *h_sb, int wait); -+ -+/* ---------------------------------------------------------------------- */ -+ -+int vfsub_update_h_iattr(struct path *h_path, int *did); -+struct file *vfsub_dentry_open(struct path *path, int flags); -+struct file *vfsub_filp_open(const char *path, int oflags, int mode); -+struct au_branch; -+struct vfsub_aopen_args { -+ struct file *file; -+ unsigned int open_flag; -+ umode_t create_mode; -+ struct au_branch *br; -+}; -+int vfsub_atomic_open(struct inode *dir, struct dentry *dentry, -+ struct vfsub_aopen_args *args); -+int vfsub_kern_path(const char *name, unsigned int flags, struct path *path); -+ -+struct dentry *vfsub_lookup_one_len_unlocked(const char *name, -+ struct dentry *parent, int len); -+struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent, -+ int len); -+ -+struct vfsub_lkup_one_args { -+ struct dentry **errp; -+ struct qstr *name; -+ struct dentry *parent; -+}; -+ -+static inline struct dentry *vfsub_lkup_one(struct qstr *name, -+ struct dentry *parent) -+{ -+ return vfsub_lookup_one_len(name->name, parent, name->len); -+} -+ -+void vfsub_call_lkup_one(void *args); -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline int vfsub_mnt_want_write(struct vfsmount *mnt) -+{ -+ int err; -+ -+ lockdep_off(); -+ err = mnt_want_write(mnt); -+ lockdep_on(); -+ return err; -+} -+ -+static inline void vfsub_mnt_drop_write(struct vfsmount *mnt) -+{ -+ lockdep_off(); -+ mnt_drop_write(mnt); -+ lockdep_on(); -+} -+ -+#if 0 /* reserved */ -+static inline void vfsub_mnt_drop_write_file(struct file *file) -+{ -+ lockdep_off(); -+ mnt_drop_write_file(file); -+ lockdep_on(); -+} -+#endif -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct au_hinode; -+struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1, -+ struct dentry *d2, struct au_hinode *hdir2); -+void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1, -+ struct dentry *d2, struct au_hinode *hdir2); -+ -+int vfsub_create(struct inode *dir, struct path *path, int mode, -+ bool want_excl); -+int vfsub_symlink(struct inode *dir, struct path *path, -+ const char *symname); -+int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev); -+int vfsub_link(struct dentry *src_dentry, struct inode *dir, -+ struct path *path, struct inode **delegated_inode); -+int vfsub_rename(struct inode *src_hdir, struct dentry *src_dentry, -+ struct inode *hdir, struct path *path, -+ struct inode **delegated_inode, unsigned int flags); -+int vfsub_mkdir(struct inode *dir, struct path *path, int mode); -+int vfsub_rmdir(struct inode *dir, struct path *path); -+ -+/* ---------------------------------------------------------------------- */ -+ -+ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count, -+ loff_t *ppos); -+ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, -+ loff_t *ppos); -+ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count, -+ loff_t *ppos); -+ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, -+ loff_t *ppos); -+int vfsub_flush(struct file *file, fl_owner_t id); -+int vfsub_iterate_dir(struct file *file, struct dir_context *ctx); -+ -+static inline loff_t vfsub_f_size_read(struct file *file) -+{ -+ return i_size_read(file_inode(file)); -+} -+ -+static inline unsigned int vfsub_file_flags(struct file *file) -+{ -+ unsigned int flags; -+ -+ spin_lock(&file->f_lock); -+ flags = file->f_flags; -+ spin_unlock(&file->f_lock); -+ -+ return flags; -+} -+ -+static inline int vfsub_file_execed(struct file *file) -+{ -+ /* todo: direct access f_flags */ -+ return !!(vfsub_file_flags(file) & __FMODE_EXEC); -+} -+ -+#if 0 /* reserved */ -+static inline void vfsub_file_accessed(struct file *h_file) -+{ -+ file_accessed(h_file); -+ vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); /*ignore*/ -+} -+#endif -+ -+#if 0 /* reserved */ -+static inline void vfsub_touch_atime(struct vfsmount *h_mnt, -+ struct dentry *h_dentry) -+{ -+ struct path h_path = { -+ .dentry = h_dentry, -+ .mnt = h_mnt -+ }; -+ touch_atime(&h_path); -+ vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/ -+} -+#endif -+ -+static inline int vfsub_update_time(struct inode *h_inode, -+ struct timespec64 *ts, int flags) -+{ -+ return update_time(h_inode, ts, flags); -+ /* no vfsub_update_h_iattr() since we don't have struct path */ -+} -+ -+#ifdef CONFIG_FS_POSIX_ACL -+static inline int vfsub_acl_chmod(struct inode *h_inode, umode_t h_mode) -+{ -+ int err; -+ -+ err = posix_acl_chmod(h_inode, h_mode); -+ if (err == -EOPNOTSUPP) -+ err = 0; -+ return err; -+} -+#else -+AuStubInt0(vfsub_acl_chmod, struct inode *h_inode, umode_t h_mode); -+#endif -+ -+long vfsub_splice_to(struct file *in, loff_t *ppos, -+ struct pipe_inode_info *pipe, size_t len, -+ unsigned int flags); -+long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out, -+ loff_t *ppos, size_t len, unsigned int flags); -+ -+static inline long vfsub_truncate(struct path *path, loff_t length) -+{ -+ long err; -+ -+ lockdep_off(); -+ err = vfs_truncate(path, length); -+ lockdep_on(); -+ return err; -+} -+ -+int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr, -+ struct file *h_file); -+int vfsub_fsync(struct file *file, struct path *path, int datasync); -+ -+/* -+ * re-use branch fs's ioctl(FICLONE) while aufs itself doesn't support such -+ * ioctl. -+ */ -+static inline loff_t vfsub_clone_file_range(struct file *src, struct file *dst, -+ loff_t len) -+{ -+ loff_t err; -+ -+ lockdep_off(); -+ err = vfs_clone_file_range(src, 0, dst, 0, len, /*remap_flags*/0); -+ lockdep_on(); -+ -+ return err; -+} -+ -+/* copy_file_range(2) is a systemcall */ -+static inline ssize_t vfsub_copy_file_range(struct file *src, loff_t src_pos, -+ struct file *dst, loff_t dst_pos, -+ size_t len, unsigned int flags) -+{ -+ ssize_t ssz; -+ -+ lockdep_off(); -+ ssz = vfs_copy_file_range(src, src_pos, dst, dst_pos, len, flags); -+ lockdep_on(); -+ -+ return ssz; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin) -+{ -+ loff_t err; -+ -+ lockdep_off(); -+ err = vfs_llseek(file, offset, origin); -+ lockdep_on(); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode); -+int vfsub_sio_rmdir(struct inode *dir, struct path *path); -+int vfsub_sio_notify_change(struct path *path, struct iattr *ia, -+ struct inode **delegated_inode); -+int vfsub_notify_change(struct path *path, struct iattr *ia, -+ struct inode **delegated_inode); -+int vfsub_unlink(struct inode *dir, struct path *path, -+ struct inode **delegated_inode, int force); -+ -+static inline int vfsub_getattr(const struct path *path, struct kstat *st) -+{ -+ return vfs_getattr(path, st, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline int vfsub_setxattr(struct dentry *dentry, const char *name, -+ const void *value, size_t size, int flags) -+{ -+ int err; -+ -+ lockdep_off(); -+ err = vfs_setxattr(dentry, name, value, size, flags); -+ lockdep_on(); -+ -+ return err; -+} -+ -+static inline int vfsub_removexattr(struct dentry *dentry, const char *name) -+{ -+ int err; -+ -+ lockdep_off(); -+ err = vfs_removexattr(dentry, name); -+ lockdep_on(); -+ -+ return err; -+} -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_VFSUB_H__ */ -diff --git a/fs/aufs/wbr_policy.c b/fs/aufs/wbr_policy.c -new file mode 100644 -index 000000000000..64954145c0ec ---- /dev/null -+++ b/fs/aufs/wbr_policy.c -@@ -0,0 +1,830 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * policies for selecting one among multiple writable branches -+ */ -+ -+#include <linux/statfs.h> -+#include "aufs.h" -+ -+/* subset of cpup_attr() */ -+static noinline_for_stack -+int au_cpdown_attr(struct path *h_path, struct dentry *h_src) -+{ -+ int err, sbits; -+ struct iattr ia; -+ struct inode *h_isrc; -+ -+ h_isrc = d_inode(h_src); -+ ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID; -+ ia.ia_mode = h_isrc->i_mode; -+ ia.ia_uid = h_isrc->i_uid; -+ ia.ia_gid = h_isrc->i_gid; -+ sbits = !!(ia.ia_mode & (S_ISUID | S_ISGID)); -+ au_cpup_attr_flags(d_inode(h_path->dentry), h_isrc->i_flags); -+ /* no delegation since it is just created */ -+ err = vfsub_sio_notify_change(h_path, &ia, /*delegated*/NULL); -+ -+ /* is this nfs only? */ -+ if (!err && sbits && au_test_nfs(h_path->dentry->d_sb)) { -+ ia.ia_valid = ATTR_FORCE | ATTR_MODE; -+ ia.ia_mode = h_isrc->i_mode; -+ err = vfsub_sio_notify_change(h_path, &ia, /*delegated*/NULL); -+ } -+ -+ return err; -+} -+ -+#define AuCpdown_PARENT_OPQ 1 -+#define AuCpdown_WHED (1 << 1) -+#define AuCpdown_MADE_DIR (1 << 2) -+#define AuCpdown_DIROPQ (1 << 3) -+#define au_ftest_cpdown(flags, name) ((flags) & AuCpdown_##name) -+#define au_fset_cpdown(flags, name) \ -+ do { (flags) |= AuCpdown_##name; } while (0) -+#define au_fclr_cpdown(flags, name) \ -+ do { (flags) &= ~AuCpdown_##name; } while (0) -+ -+static int au_cpdown_dir_opq(struct dentry *dentry, aufs_bindex_t bdst, -+ unsigned int *flags) -+{ -+ int err; -+ struct dentry *opq_dentry; -+ -+ opq_dentry = au_diropq_create(dentry, bdst); -+ err = PTR_ERR(opq_dentry); -+ if (IS_ERR(opq_dentry)) -+ goto out; -+ dput(opq_dentry); -+ au_fset_cpdown(*flags, DIROPQ); -+ -+out: -+ return err; -+} -+ -+static int au_cpdown_dir_wh(struct dentry *dentry, struct dentry *h_parent, -+ struct inode *dir, aufs_bindex_t bdst) -+{ -+ int err; -+ struct path h_path; -+ struct au_branch *br; -+ -+ br = au_sbr(dentry->d_sb, bdst); -+ h_path.dentry = au_wh_lkup(h_parent, &dentry->d_name, br); -+ err = PTR_ERR(h_path.dentry); -+ if (IS_ERR(h_path.dentry)) -+ goto out; -+ -+ err = 0; -+ if (d_is_positive(h_path.dentry)) { -+ h_path.mnt = au_br_mnt(br); -+ err = au_wh_unlink_dentry(au_h_iptr(dir, bdst), &h_path, -+ dentry); -+ } -+ dput(h_path.dentry); -+ -+out: -+ return err; -+} -+ -+static int au_cpdown_dir(struct dentry *dentry, aufs_bindex_t bdst, -+ struct au_pin *pin, -+ struct dentry *h_parent, void *arg) -+{ -+ int err, rerr; -+ aufs_bindex_t bopq, btop; -+ struct path h_path; -+ struct dentry *parent; -+ struct inode *h_dir, *h_inode, *inode, *dir; -+ unsigned int *flags = arg; -+ -+ btop = au_dbtop(dentry); -+ /* dentry is di-locked */ -+ parent = dget_parent(dentry); -+ dir = d_inode(parent); -+ h_dir = d_inode(h_parent); -+ AuDebugOn(h_dir != au_h_iptr(dir, bdst)); -+ IMustLock(h_dir); -+ -+ err = au_lkup_neg(dentry, bdst, /*wh*/0); -+ if (unlikely(err < 0)) -+ goto out; -+ h_path.dentry = au_h_dptr(dentry, bdst); -+ h_path.mnt = au_sbr_mnt(dentry->d_sb, bdst); -+ err = vfsub_sio_mkdir(au_h_iptr(dir, bdst), &h_path, 0755); -+ if (unlikely(err)) -+ goto out_put; -+ au_fset_cpdown(*flags, MADE_DIR); -+ -+ bopq = au_dbdiropq(dentry); -+ au_fclr_cpdown(*flags, WHED); -+ au_fclr_cpdown(*flags, DIROPQ); -+ if (au_dbwh(dentry) == bdst) -+ au_fset_cpdown(*flags, WHED); -+ if (!au_ftest_cpdown(*flags, PARENT_OPQ) && bopq <= bdst) -+ au_fset_cpdown(*flags, PARENT_OPQ); -+ h_inode = d_inode(h_path.dentry); -+ inode_lock_nested(h_inode, AuLsc_I_CHILD); -+ if (au_ftest_cpdown(*flags, WHED)) { -+ err = au_cpdown_dir_opq(dentry, bdst, flags); -+ if (unlikely(err)) { -+ inode_unlock(h_inode); -+ goto out_dir; -+ } -+ } -+ -+ err = au_cpdown_attr(&h_path, au_h_dptr(dentry, btop)); -+ inode_unlock(h_inode); -+ if (unlikely(err)) -+ goto out_opq; -+ -+ if (au_ftest_cpdown(*flags, WHED)) { -+ err = au_cpdown_dir_wh(dentry, h_parent, dir, bdst); -+ if (unlikely(err)) -+ goto out_opq; -+ } -+ -+ inode = d_inode(dentry); -+ if (au_ibbot(inode) < bdst) -+ au_set_ibbot(inode, bdst); -+ au_set_h_iptr(inode, bdst, au_igrab(h_inode), -+ au_hi_flags(inode, /*isdir*/1)); -+ au_fhsm_wrote(dentry->d_sb, bdst, /*force*/0); -+ goto out; /* success */ -+ -+ /* revert */ -+out_opq: -+ if (au_ftest_cpdown(*flags, DIROPQ)) { -+ inode_lock_nested(h_inode, AuLsc_I_CHILD); -+ rerr = au_diropq_remove(dentry, bdst); -+ inode_unlock(h_inode); -+ if (unlikely(rerr)) { -+ AuIOErr("failed removing diropq for %pd b%d (%d)\n", -+ dentry, bdst, rerr); -+ err = -EIO; -+ goto out; -+ } -+ } -+out_dir: -+ if (au_ftest_cpdown(*flags, MADE_DIR)) { -+ rerr = vfsub_sio_rmdir(au_h_iptr(dir, bdst), &h_path); -+ if (unlikely(rerr)) { -+ AuIOErr("failed removing %pd b%d (%d)\n", -+ dentry, bdst, rerr); -+ err = -EIO; -+ } -+ } -+out_put: -+ au_set_h_dptr(dentry, bdst, NULL); -+ if (au_dbbot(dentry) == bdst) -+ au_update_dbbot(dentry); -+out: -+ dput(parent); -+ return err; -+} -+ -+int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst) -+{ -+ int err; -+ unsigned int flags; -+ -+ flags = 0; -+ err = au_cp_dirs(dentry, bdst, au_cpdown_dir, &flags); -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* policies for create */ -+ -+int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex) -+{ -+ int err, i, j, ndentry; -+ aufs_bindex_t bopq; -+ struct au_dcsub_pages dpages; -+ struct au_dpage *dpage; -+ struct dentry **dentries, *parent, *d; -+ -+ err = au_dpages_init(&dpages, GFP_NOFS); -+ if (unlikely(err)) -+ goto out; -+ parent = dget_parent(dentry); -+ err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/0); -+ if (unlikely(err)) -+ goto out_free; -+ -+ err = bindex; -+ for (i = 0; i < dpages.ndpage; i++) { -+ dpage = dpages.dpages + i; -+ dentries = dpage->dentries; -+ ndentry = dpage->ndentry; -+ for (j = 0; j < ndentry; j++) { -+ d = dentries[j]; -+ di_read_lock_parent2(d, !AuLock_IR); -+ bopq = au_dbdiropq(d); -+ di_read_unlock(d, !AuLock_IR); -+ if (bopq >= 0 && bopq < err) -+ err = bopq; -+ } -+ } -+ -+out_free: -+ dput(parent); -+ au_dpages_free(&dpages); -+out: -+ return err; -+} -+ -+static int au_wbr_bu(struct super_block *sb, aufs_bindex_t bindex) -+{ -+ for (; bindex >= 0; bindex--) -+ if (!au_br_rdonly(au_sbr(sb, bindex))) -+ return bindex; -+ return -EROFS; -+} -+ -+/* top down parent */ -+static int au_wbr_create_tdp(struct dentry *dentry, -+ unsigned int flags __maybe_unused) -+{ -+ int err; -+ aufs_bindex_t btop, bindex; -+ struct super_block *sb; -+ struct dentry *parent, *h_parent; -+ -+ sb = dentry->d_sb; -+ btop = au_dbtop(dentry); -+ err = btop; -+ if (!au_br_rdonly(au_sbr(sb, btop))) -+ goto out; -+ -+ err = -EROFS; -+ parent = dget_parent(dentry); -+ for (bindex = au_dbtop(parent); bindex < btop; bindex++) { -+ h_parent = au_h_dptr(parent, bindex); -+ if (!h_parent || d_is_negative(h_parent)) -+ continue; -+ -+ if (!au_br_rdonly(au_sbr(sb, bindex))) { -+ err = bindex; -+ break; -+ } -+ } -+ dput(parent); -+ -+ /* bottom up here */ -+ if (unlikely(err < 0)) { -+ err = au_wbr_bu(sb, btop - 1); -+ if (err >= 0) -+ err = au_wbr_nonopq(dentry, err); -+ } -+ -+out: -+ AuDbg("b%d\n", err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* an exception for the policy other than tdp */ -+static int au_wbr_create_exp(struct dentry *dentry) -+{ -+ int err; -+ aufs_bindex_t bwh, bdiropq; -+ struct dentry *parent; -+ -+ err = -1; -+ bwh = au_dbwh(dentry); -+ parent = dget_parent(dentry); -+ bdiropq = au_dbdiropq(parent); -+ if (bwh >= 0) { -+ if (bdiropq >= 0) -+ err = min(bdiropq, bwh); -+ else -+ err = bwh; -+ AuDbg("%d\n", err); -+ } else if (bdiropq >= 0) { -+ err = bdiropq; -+ AuDbg("%d\n", err); -+ } -+ dput(parent); -+ -+ if (err >= 0) -+ err = au_wbr_nonopq(dentry, err); -+ -+ if (err >= 0 && au_br_rdonly(au_sbr(dentry->d_sb, err))) -+ err = -1; -+ -+ AuDbg("%d\n", err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* round robin */ -+static int au_wbr_create_init_rr(struct super_block *sb) -+{ -+ int err; -+ -+ err = au_wbr_bu(sb, au_sbbot(sb)); -+ atomic_set(&au_sbi(sb)->si_wbr_rr_next, -err); /* less important */ -+ /* smp_mb(); */ -+ -+ AuDbg("b%d\n", err); -+ return err; -+} -+ -+static int au_wbr_create_rr(struct dentry *dentry, unsigned int flags) -+{ -+ int err, nbr; -+ unsigned int u; -+ aufs_bindex_t bindex, bbot; -+ struct super_block *sb; -+ atomic_t *next; -+ -+ err = au_wbr_create_exp(dentry); -+ if (err >= 0) -+ goto out; -+ -+ sb = dentry->d_sb; -+ next = &au_sbi(sb)->si_wbr_rr_next; -+ bbot = au_sbbot(sb); -+ nbr = bbot + 1; -+ for (bindex = 0; bindex <= bbot; bindex++) { -+ if (!au_ftest_wbr(flags, DIR)) { -+ err = atomic_dec_return(next) + 1; -+ /* modulo for 0 is meaningless */ -+ if (unlikely(!err)) -+ err = atomic_dec_return(next) + 1; -+ } else -+ err = atomic_read(next); -+ AuDbg("%d\n", err); -+ u = err; -+ err = u % nbr; -+ AuDbg("%d\n", err); -+ if (!au_br_rdonly(au_sbr(sb, err))) -+ break; -+ err = -EROFS; -+ } -+ -+ if (err >= 0) -+ err = au_wbr_nonopq(dentry, err); -+ -+out: -+ AuDbg("%d\n", err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* most free space */ -+static void au_mfs(struct dentry *dentry, struct dentry *parent) -+{ -+ struct super_block *sb; -+ struct au_branch *br; -+ struct au_wbr_mfs *mfs; -+ struct dentry *h_parent; -+ aufs_bindex_t bindex, bbot; -+ int err; -+ unsigned long long b, bavail; -+ struct path h_path; -+ /* reduce the stack usage */ -+ struct kstatfs *st; -+ -+ st = kmalloc(sizeof(*st), GFP_NOFS); -+ if (unlikely(!st)) { -+ AuWarn1("failed updating mfs(%d), ignored\n", -ENOMEM); -+ return; -+ } -+ -+ bavail = 0; -+ sb = dentry->d_sb; -+ mfs = &au_sbi(sb)->si_wbr_mfs; -+ MtxMustLock(&mfs->mfs_lock); -+ mfs->mfs_bindex = -EROFS; -+ mfs->mfsrr_bytes = 0; -+ if (!parent) { -+ bindex = 0; -+ bbot = au_sbbot(sb); -+ } else { -+ bindex = au_dbtop(parent); -+ bbot = au_dbtaildir(parent); -+ } -+ -+ for (; bindex <= bbot; bindex++) { -+ if (parent) { -+ h_parent = au_h_dptr(parent, bindex); -+ if (!h_parent || d_is_negative(h_parent)) -+ continue; -+ } -+ br = au_sbr(sb, bindex); -+ if (au_br_rdonly(br)) -+ continue; -+ -+ /* sb->s_root for NFS is unreliable */ -+ h_path.mnt = au_br_mnt(br); -+ h_path.dentry = h_path.mnt->mnt_root; -+ err = vfs_statfs(&h_path, st); -+ if (unlikely(err)) { -+ AuWarn1("failed statfs, b%d, %d\n", bindex, err); -+ continue; -+ } -+ -+ /* when the available size is equal, select the lower one */ -+ BUILD_BUG_ON(sizeof(b) < sizeof(st->f_bavail) -+ || sizeof(b) < sizeof(st->f_bsize)); -+ b = st->f_bavail * st->f_bsize; -+ br->br_wbr->wbr_bytes = b; -+ if (b >= bavail) { -+ bavail = b; -+ mfs->mfs_bindex = bindex; -+ mfs->mfs_jiffy = jiffies; -+ } -+ } -+ -+ mfs->mfsrr_bytes = bavail; -+ AuDbg("b%d\n", mfs->mfs_bindex); -+ au_kfree_rcu(st); -+} -+ -+static int au_wbr_create_mfs(struct dentry *dentry, unsigned int flags) -+{ -+ int err; -+ struct dentry *parent; -+ struct super_block *sb; -+ struct au_wbr_mfs *mfs; -+ -+ err = au_wbr_create_exp(dentry); -+ if (err >= 0) -+ goto out; -+ -+ sb = dentry->d_sb; -+ parent = NULL; -+ if (au_ftest_wbr(flags, PARENT)) -+ parent = dget_parent(dentry); -+ mfs = &au_sbi(sb)->si_wbr_mfs; -+ mutex_lock(&mfs->mfs_lock); -+ if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire) -+ || mfs->mfs_bindex < 0 -+ || au_br_rdonly(au_sbr(sb, mfs->mfs_bindex))) -+ au_mfs(dentry, parent); -+ mutex_unlock(&mfs->mfs_lock); -+ err = mfs->mfs_bindex; -+ dput(parent); -+ -+ if (err >= 0) -+ err = au_wbr_nonopq(dentry, err); -+ -+out: -+ AuDbg("b%d\n", err); -+ return err; -+} -+ -+static int au_wbr_create_init_mfs(struct super_block *sb) -+{ -+ struct au_wbr_mfs *mfs; -+ -+ mfs = &au_sbi(sb)->si_wbr_mfs; -+ mutex_init(&mfs->mfs_lock); -+ mfs->mfs_jiffy = 0; -+ mfs->mfs_bindex = -EROFS; -+ -+ return 0; -+} -+ -+static int au_wbr_create_fin_mfs(struct super_block *sb __maybe_unused) -+{ -+ mutex_destroy(&au_sbi(sb)->si_wbr_mfs.mfs_lock); -+ return 0; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* top down regardless parent, and then mfs */ -+static int au_wbr_create_tdmfs(struct dentry *dentry, -+ unsigned int flags __maybe_unused) -+{ -+ int err; -+ aufs_bindex_t bwh, btail, bindex, bfound, bmfs; -+ unsigned long long watermark; -+ struct super_block *sb; -+ struct au_wbr_mfs *mfs; -+ struct au_branch *br; -+ struct dentry *parent; -+ -+ sb = dentry->d_sb; -+ mfs = &au_sbi(sb)->si_wbr_mfs; -+ mutex_lock(&mfs->mfs_lock); -+ if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire) -+ || mfs->mfs_bindex < 0) -+ au_mfs(dentry, /*parent*/NULL); -+ watermark = mfs->mfsrr_watermark; -+ bmfs = mfs->mfs_bindex; -+ mutex_unlock(&mfs->mfs_lock); -+ -+ /* another style of au_wbr_create_exp() */ -+ bwh = au_dbwh(dentry); -+ parent = dget_parent(dentry); -+ btail = au_dbtaildir(parent); -+ if (bwh >= 0 && bwh < btail) -+ btail = bwh; -+ -+ err = au_wbr_nonopq(dentry, btail); -+ if (unlikely(err < 0)) -+ goto out; -+ btail = err; -+ bfound = -1; -+ for (bindex = 0; bindex <= btail; bindex++) { -+ br = au_sbr(sb, bindex); -+ if (au_br_rdonly(br)) -+ continue; -+ if (br->br_wbr->wbr_bytes > watermark) { -+ bfound = bindex; -+ break; -+ } -+ } -+ err = bfound; -+ if (err < 0) -+ err = bmfs; -+ -+out: -+ dput(parent); -+ AuDbg("b%d\n", err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* most free space and then round robin */ -+static int au_wbr_create_mfsrr(struct dentry *dentry, unsigned int flags) -+{ -+ int err; -+ struct au_wbr_mfs *mfs; -+ -+ err = au_wbr_create_mfs(dentry, flags); -+ if (err >= 0) { -+ mfs = &au_sbi(dentry->d_sb)->si_wbr_mfs; -+ mutex_lock(&mfs->mfs_lock); -+ if (mfs->mfsrr_bytes < mfs->mfsrr_watermark) -+ err = au_wbr_create_rr(dentry, flags); -+ mutex_unlock(&mfs->mfs_lock); -+ } -+ -+ AuDbg("b%d\n", err); -+ return err; -+} -+ -+static int au_wbr_create_init_mfsrr(struct super_block *sb) -+{ -+ int err; -+ -+ au_wbr_create_init_mfs(sb); /* ignore */ -+ err = au_wbr_create_init_rr(sb); -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* top down parent and most free space */ -+static int au_wbr_create_pmfs(struct dentry *dentry, unsigned int flags) -+{ -+ int err, e2; -+ unsigned long long b; -+ aufs_bindex_t bindex, btop, bbot; -+ struct super_block *sb; -+ struct dentry *parent, *h_parent; -+ struct au_branch *br; -+ -+ err = au_wbr_create_tdp(dentry, flags); -+ if (unlikely(err < 0)) -+ goto out; -+ parent = dget_parent(dentry); -+ btop = au_dbtop(parent); -+ bbot = au_dbtaildir(parent); -+ if (btop == bbot) -+ goto out_parent; /* success */ -+ -+ e2 = au_wbr_create_mfs(dentry, flags); -+ if (e2 < 0) -+ goto out_parent; /* success */ -+ -+ /* when the available size is equal, select upper one */ -+ sb = dentry->d_sb; -+ br = au_sbr(sb, err); -+ b = br->br_wbr->wbr_bytes; -+ AuDbg("b%d, %llu\n", err, b); -+ -+ for (bindex = btop; bindex <= bbot; bindex++) { -+ h_parent = au_h_dptr(parent, bindex); -+ if (!h_parent || d_is_negative(h_parent)) -+ continue; -+ -+ br = au_sbr(sb, bindex); -+ if (!au_br_rdonly(br) && br->br_wbr->wbr_bytes > b) { -+ b = br->br_wbr->wbr_bytes; -+ err = bindex; -+ AuDbg("b%d, %llu\n", err, b); -+ } -+ } -+ -+ if (err >= 0) -+ err = au_wbr_nonopq(dentry, err); -+ -+out_parent: -+ dput(parent); -+out: -+ AuDbg("b%d\n", err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * - top down parent -+ * - most free space with parent -+ * - most free space round-robin regardless parent -+ */ -+static int au_wbr_create_pmfsrr(struct dentry *dentry, unsigned int flags) -+{ -+ int err; -+ unsigned long long watermark; -+ struct super_block *sb; -+ struct au_branch *br; -+ struct au_wbr_mfs *mfs; -+ -+ err = au_wbr_create_pmfs(dentry, flags | AuWbr_PARENT); -+ if (unlikely(err < 0)) -+ goto out; -+ -+ sb = dentry->d_sb; -+ br = au_sbr(sb, err); -+ mfs = &au_sbi(sb)->si_wbr_mfs; -+ mutex_lock(&mfs->mfs_lock); -+ watermark = mfs->mfsrr_watermark; -+ mutex_unlock(&mfs->mfs_lock); -+ if (br->br_wbr->wbr_bytes < watermark) -+ /* regardless the parent dir */ -+ err = au_wbr_create_mfsrr(dentry, flags); -+ -+out: -+ AuDbg("b%d\n", err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* policies for copyup */ -+ -+/* top down parent */ -+static int au_wbr_copyup_tdp(struct dentry *dentry) -+{ -+ return au_wbr_create_tdp(dentry, /*flags, anything is ok*/0); -+} -+ -+/* bottom up parent */ -+static int au_wbr_copyup_bup(struct dentry *dentry) -+{ -+ int err; -+ aufs_bindex_t bindex, btop; -+ struct dentry *parent, *h_parent; -+ struct super_block *sb; -+ -+ err = -EROFS; -+ sb = dentry->d_sb; -+ parent = dget_parent(dentry); -+ btop = au_dbtop(parent); -+ for (bindex = au_dbtop(dentry); bindex >= btop; bindex--) { -+ h_parent = au_h_dptr(parent, bindex); -+ if (!h_parent || d_is_negative(h_parent)) -+ continue; -+ -+ if (!au_br_rdonly(au_sbr(sb, bindex))) { -+ err = bindex; -+ break; -+ } -+ } -+ dput(parent); -+ -+ /* bottom up here */ -+ if (unlikely(err < 0)) -+ err = au_wbr_bu(sb, btop - 1); -+ -+ AuDbg("b%d\n", err); -+ return err; -+} -+ -+/* bottom up */ -+int au_wbr_do_copyup_bu(struct dentry *dentry, aufs_bindex_t btop) -+{ -+ int err; -+ -+ err = au_wbr_bu(dentry->d_sb, btop); -+ AuDbg("b%d\n", err); -+ if (err > btop) -+ err = au_wbr_nonopq(dentry, err); -+ -+ AuDbg("b%d\n", err); -+ return err; -+} -+ -+static int au_wbr_copyup_bu(struct dentry *dentry) -+{ -+ int err; -+ aufs_bindex_t btop; -+ -+ btop = au_dbtop(dentry); -+ err = au_wbr_do_copyup_bu(dentry, btop); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct au_wbr_copyup_operations au_wbr_copyup_ops[] = { -+ [AuWbrCopyup_TDP] = { -+ .copyup = au_wbr_copyup_tdp -+ }, -+ [AuWbrCopyup_BUP] = { -+ .copyup = au_wbr_copyup_bup -+ }, -+ [AuWbrCopyup_BU] = { -+ .copyup = au_wbr_copyup_bu -+ } -+}; -+ -+struct au_wbr_create_operations au_wbr_create_ops[] = { -+ [AuWbrCreate_TDP] = { -+ .create = au_wbr_create_tdp -+ }, -+ [AuWbrCreate_RR] = { -+ .create = au_wbr_create_rr, -+ .init = au_wbr_create_init_rr -+ }, -+ [AuWbrCreate_MFS] = { -+ .create = au_wbr_create_mfs, -+ .init = au_wbr_create_init_mfs, -+ .fin = au_wbr_create_fin_mfs -+ }, -+ [AuWbrCreate_MFSV] = { -+ .create = au_wbr_create_mfs, -+ .init = au_wbr_create_init_mfs, -+ .fin = au_wbr_create_fin_mfs -+ }, -+ [AuWbrCreate_MFSRR] = { -+ .create = au_wbr_create_mfsrr, -+ .init = au_wbr_create_init_mfsrr, -+ .fin = au_wbr_create_fin_mfs -+ }, -+ [AuWbrCreate_MFSRRV] = { -+ .create = au_wbr_create_mfsrr, -+ .init = au_wbr_create_init_mfsrr, -+ .fin = au_wbr_create_fin_mfs -+ }, -+ [AuWbrCreate_TDMFS] = { -+ .create = au_wbr_create_tdmfs, -+ .init = au_wbr_create_init_mfs, -+ .fin = au_wbr_create_fin_mfs -+ }, -+ [AuWbrCreate_TDMFSV] = { -+ .create = au_wbr_create_tdmfs, -+ .init = au_wbr_create_init_mfs, -+ .fin = au_wbr_create_fin_mfs -+ }, -+ [AuWbrCreate_PMFS] = { -+ .create = au_wbr_create_pmfs, -+ .init = au_wbr_create_init_mfs, -+ .fin = au_wbr_create_fin_mfs -+ }, -+ [AuWbrCreate_PMFSV] = { -+ .create = au_wbr_create_pmfs, -+ .init = au_wbr_create_init_mfs, -+ .fin = au_wbr_create_fin_mfs -+ }, -+ [AuWbrCreate_PMFSRR] = { -+ .create = au_wbr_create_pmfsrr, -+ .init = au_wbr_create_init_mfsrr, -+ .fin = au_wbr_create_fin_mfs -+ }, -+ [AuWbrCreate_PMFSRRV] = { -+ .create = au_wbr_create_pmfsrr, -+ .init = au_wbr_create_init_mfsrr, -+ .fin = au_wbr_create_fin_mfs -+ } -+}; -diff --git a/fs/aufs/whout.c b/fs/aufs/whout.c -new file mode 100644 -index 000000000000..6c9c8501562a ---- /dev/null -+++ b/fs/aufs/whout.c -@@ -0,0 +1,1062 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * whiteout for logical deletion and opaque directory -+ */ -+ -+#include "aufs.h" -+ -+#define WH_MASK 0444 -+ -+/* -+ * If a directory contains this file, then it is opaque. We start with the -+ * .wh. flag so that it is blocked by lookup. -+ */ -+static struct qstr diropq_name = QSTR_INIT(AUFS_WH_DIROPQ, -+ sizeof(AUFS_WH_DIROPQ) - 1); -+ -+/* -+ * generate whiteout name, which is NOT terminated by NULL. -+ * @name: original d_name.name -+ * @len: original d_name.len -+ * @wh: whiteout qstr -+ * returns zero when succeeds, otherwise error. -+ * succeeded value as wh->name should be freed by kfree(). -+ */ -+int au_wh_name_alloc(struct qstr *wh, const struct qstr *name) -+{ -+ char *p; -+ -+ if (unlikely(name->len > PATH_MAX - AUFS_WH_PFX_LEN)) -+ return -ENAMETOOLONG; -+ -+ wh->len = name->len + AUFS_WH_PFX_LEN; -+ p = kmalloc(wh->len, GFP_NOFS); -+ wh->name = p; -+ if (p) { -+ memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); -+ memcpy(p + AUFS_WH_PFX_LEN, name->name, name->len); -+ /* smp_mb(); */ -+ return 0; -+ } -+ return -ENOMEM; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * test if the @wh_name exists under @h_parent. -+ * @try_sio specifies the necessary of super-io. -+ */ -+int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, int try_sio) -+{ -+ int err; -+ struct dentry *wh_dentry; -+ -+ if (!try_sio) -+ wh_dentry = vfsub_lkup_one(wh_name, h_parent); -+ else -+ wh_dentry = au_sio_lkup_one(wh_name, h_parent); -+ err = PTR_ERR(wh_dentry); -+ if (IS_ERR(wh_dentry)) { -+ if (err == -ENAMETOOLONG) -+ err = 0; -+ goto out; -+ } -+ -+ err = 0; -+ if (d_is_negative(wh_dentry)) -+ goto out_wh; /* success */ -+ -+ err = 1; -+ if (d_is_reg(wh_dentry)) -+ goto out_wh; /* success */ -+ -+ err = -EIO; -+ AuIOErr("%pd Invalid whiteout entry type 0%o.\n", -+ wh_dentry, d_inode(wh_dentry)->i_mode); -+ -+out_wh: -+ dput(wh_dentry); -+out: -+ return err; -+} -+ -+/* -+ * test if the @h_dentry sets opaque or not. -+ */ -+int au_diropq_test(struct dentry *h_dentry) -+{ -+ int err; -+ struct inode *h_dir; -+ -+ h_dir = d_inode(h_dentry); -+ err = au_wh_test(h_dentry, &diropq_name, -+ au_test_h_perm_sio(h_dir, MAY_EXEC)); -+ return err; -+} -+ -+/* -+ * returns a negative dentry whose name is unique and temporary. -+ */ -+struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br, -+ struct qstr *prefix) -+{ -+ struct dentry *dentry; -+ int i; -+ char defname[NAME_MAX - AUFS_MAX_NAMELEN + DNAME_INLINE_LEN + 1], -+ *name, *p; -+ /* strict atomic_t is unnecessary here */ -+ static unsigned short cnt; -+ struct qstr qs; -+ -+ BUILD_BUG_ON(sizeof(cnt) * 2 > AUFS_WH_TMP_LEN); -+ -+ name = defname; -+ qs.len = sizeof(defname) - DNAME_INLINE_LEN + prefix->len - 1; -+ if (unlikely(prefix->len > DNAME_INLINE_LEN)) { -+ dentry = ERR_PTR(-ENAMETOOLONG); -+ if (unlikely(qs.len > NAME_MAX)) -+ goto out; -+ dentry = ERR_PTR(-ENOMEM); -+ name = kmalloc(qs.len + 1, GFP_NOFS); -+ if (unlikely(!name)) -+ goto out; -+ } -+ -+ /* doubly whiteout-ed */ -+ memcpy(name, AUFS_WH_PFX AUFS_WH_PFX, AUFS_WH_PFX_LEN * 2); -+ p = name + AUFS_WH_PFX_LEN * 2; -+ memcpy(p, prefix->name, prefix->len); -+ p += prefix->len; -+ *p++ = '.'; -+ AuDebugOn(name + qs.len + 1 - p <= AUFS_WH_TMP_LEN); -+ -+ qs.name = name; -+ for (i = 0; i < 3; i++) { -+ sprintf(p, "%.*x", AUFS_WH_TMP_LEN, cnt++); -+ dentry = au_sio_lkup_one(&qs, h_parent); -+ if (IS_ERR(dentry) || d_is_negative(dentry)) -+ goto out_name; -+ dput(dentry); -+ } -+ /* pr_warn("could not get random name\n"); */ -+ dentry = ERR_PTR(-EEXIST); -+ AuDbg("%.*s\n", AuLNPair(&qs)); -+ BUG(); -+ -+out_name: -+ if (name != defname) -+ au_kfree_try_rcu(name); -+out: -+ AuTraceErrPtr(dentry); -+ return dentry; -+} -+ -+/* -+ * rename the @h_dentry on @br to the whiteouted temporary name. -+ */ -+int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br) -+{ -+ int err; -+ struct path h_path = { -+ .mnt = au_br_mnt(br) -+ }; -+ struct inode *h_dir, *delegated; -+ struct dentry *h_parent; -+ -+ h_parent = h_dentry->d_parent; /* dir inode is locked */ -+ h_dir = d_inode(h_parent); -+ IMustLock(h_dir); -+ -+ h_path.dentry = au_whtmp_lkup(h_parent, br, &h_dentry->d_name); -+ err = PTR_ERR(h_path.dentry); -+ if (IS_ERR(h_path.dentry)) -+ goto out; -+ -+ /* under the same dir, no need to lock_rename() */ -+ delegated = NULL; -+ err = vfsub_rename(h_dir, h_dentry, h_dir, &h_path, &delegated, -+ /*flags*/0); -+ AuTraceErr(err); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal rename\n"); -+ iput(delegated); -+ } -+ dput(h_path.dentry); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+/* -+ * functions for removing a whiteout -+ */ -+ -+static int do_unlink_wh(struct inode *h_dir, struct path *h_path) -+{ -+ int err, force; -+ struct inode *delegated; -+ -+ /* -+ * forces superio when the dir has a sticky bit. -+ * this may be a violation of unix fs semantics. -+ */ -+ force = (h_dir->i_mode & S_ISVTX) -+ && !uid_eq(current_fsuid(), d_inode(h_path->dentry)->i_uid); -+ delegated = NULL; -+ err = vfsub_unlink(h_dir, h_path, &delegated, force); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal unlink\n"); -+ iput(delegated); -+ } -+ return err; -+} -+ -+int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path, -+ struct dentry *dentry) -+{ -+ int err; -+ -+ err = do_unlink_wh(h_dir, h_path); -+ if (!err && dentry) -+ au_set_dbwh(dentry, -1); -+ -+ return err; -+} -+ -+static int unlink_wh_name(struct dentry *h_parent, struct qstr *wh, -+ struct au_branch *br) -+{ -+ int err; -+ struct path h_path = { -+ .mnt = au_br_mnt(br) -+ }; -+ -+ err = 0; -+ h_path.dentry = vfsub_lkup_one(wh, h_parent); -+ if (IS_ERR(h_path.dentry)) -+ err = PTR_ERR(h_path.dentry); -+ else { -+ if (d_is_reg(h_path.dentry)) -+ err = do_unlink_wh(d_inode(h_parent), &h_path); -+ dput(h_path.dentry); -+ } -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+/* -+ * initialize/clean whiteout for a branch -+ */ -+ -+static void au_wh_clean(struct inode *h_dir, struct path *whpath, -+ const int isdir) -+{ -+ int err; -+ struct inode *delegated; -+ -+ if (d_is_negative(whpath->dentry)) -+ return; -+ -+ if (isdir) -+ err = vfsub_rmdir(h_dir, whpath); -+ else { -+ delegated = NULL; -+ err = vfsub_unlink(h_dir, whpath, &delegated, /*force*/0); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal unlink\n"); -+ iput(delegated); -+ } -+ } -+ if (unlikely(err)) -+ pr_warn("failed removing %pd (%d), ignored.\n", -+ whpath->dentry, err); -+} -+ -+static int test_linkable(struct dentry *h_root) -+{ -+ struct inode *h_dir = d_inode(h_root); -+ -+ if (h_dir->i_op->link) -+ return 0; -+ -+ pr_err("%pd (%s) doesn't support link(2), use noplink and rw+nolwh\n", -+ h_root, au_sbtype(h_root->d_sb)); -+ return -ENOSYS; -+} -+ -+/* todo: should this mkdir be done in /sbin/mount.aufs helper? */ -+static int au_whdir(struct inode *h_dir, struct path *path) -+{ -+ int err; -+ -+ err = -EEXIST; -+ if (d_is_negative(path->dentry)) { -+ int mode = 0700; -+ -+ if (au_test_nfs(path->dentry->d_sb)) -+ mode |= 0111; -+ err = vfsub_mkdir(h_dir, path, mode); -+ } else if (d_is_dir(path->dentry)) -+ err = 0; -+ else -+ pr_err("unknown %pd exists\n", path->dentry); -+ -+ return err; -+} -+ -+struct au_wh_base { -+ const struct qstr *name; -+ struct dentry *dentry; -+}; -+ -+static void au_wh_init_ro(struct inode *h_dir, struct au_wh_base base[], -+ struct path *h_path) -+{ -+ h_path->dentry = base[AuBrWh_BASE].dentry; -+ au_wh_clean(h_dir, h_path, /*isdir*/0); -+ h_path->dentry = base[AuBrWh_PLINK].dentry; -+ au_wh_clean(h_dir, h_path, /*isdir*/1); -+ h_path->dentry = base[AuBrWh_ORPH].dentry; -+ au_wh_clean(h_dir, h_path, /*isdir*/1); -+} -+ -+/* -+ * returns tri-state, -+ * minus: error, caller should print the message -+ * zero: success -+ * plus: error, caller should NOT print the message -+ */ -+static int au_wh_init_rw_nolink(struct dentry *h_root, struct au_wbr *wbr, -+ int do_plink, struct au_wh_base base[], -+ struct path *h_path) -+{ -+ int err; -+ struct inode *h_dir; -+ -+ h_dir = d_inode(h_root); -+ h_path->dentry = base[AuBrWh_BASE].dentry; -+ au_wh_clean(h_dir, h_path, /*isdir*/0); -+ h_path->dentry = base[AuBrWh_PLINK].dentry; -+ if (do_plink) { -+ err = test_linkable(h_root); -+ if (unlikely(err)) { -+ err = 1; -+ goto out; -+ } -+ -+ err = au_whdir(h_dir, h_path); -+ if (unlikely(err)) -+ goto out; -+ wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry); -+ } else -+ au_wh_clean(h_dir, h_path, /*isdir*/1); -+ h_path->dentry = base[AuBrWh_ORPH].dentry; -+ err = au_whdir(h_dir, h_path); -+ if (unlikely(err)) -+ goto out; -+ wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry); -+ -+out: -+ return err; -+} -+ -+/* -+ * for the moment, aufs supports the branch filesystem which does not support -+ * link(2). testing on FAT which does not support i_op->setattr() fully either, -+ * copyup failed. finally, such filesystem will not be used as the writable -+ * branch. -+ * -+ * returns tri-state, see above. -+ */ -+static int au_wh_init_rw(struct dentry *h_root, struct au_wbr *wbr, -+ int do_plink, struct au_wh_base base[], -+ struct path *h_path) -+{ -+ int err; -+ struct inode *h_dir; -+ -+ WbrWhMustWriteLock(wbr); -+ -+ err = test_linkable(h_root); -+ if (unlikely(err)) { -+ err = 1; -+ goto out; -+ } -+ -+ /* -+ * todo: should this create be done in /sbin/mount.aufs helper? -+ */ -+ err = -EEXIST; -+ h_dir = d_inode(h_root); -+ if (d_is_negative(base[AuBrWh_BASE].dentry)) { -+ h_path->dentry = base[AuBrWh_BASE].dentry; -+ err = vfsub_create(h_dir, h_path, WH_MASK, /*want_excl*/true); -+ } else if (d_is_reg(base[AuBrWh_BASE].dentry)) -+ err = 0; -+ else -+ pr_err("unknown %pd2 exists\n", base[AuBrWh_BASE].dentry); -+ if (unlikely(err)) -+ goto out; -+ -+ h_path->dentry = base[AuBrWh_PLINK].dentry; -+ if (do_plink) { -+ err = au_whdir(h_dir, h_path); -+ if (unlikely(err)) -+ goto out; -+ wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry); -+ } else -+ au_wh_clean(h_dir, h_path, /*isdir*/1); -+ wbr->wbr_whbase = dget(base[AuBrWh_BASE].dentry); -+ -+ h_path->dentry = base[AuBrWh_ORPH].dentry; -+ err = au_whdir(h_dir, h_path); -+ if (unlikely(err)) -+ goto out; -+ wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry); -+ -+out: -+ return err; -+} -+ -+/* -+ * initialize the whiteout base file/dir for @br. -+ */ -+int au_wh_init(struct au_branch *br, struct super_block *sb) -+{ -+ int err, i; -+ const unsigned char do_plink -+ = !!au_opt_test(au_mntflags(sb), PLINK); -+ struct inode *h_dir; -+ struct path path = br->br_path; -+ struct dentry *h_root = path.dentry; -+ struct au_wbr *wbr = br->br_wbr; -+ static const struct qstr base_name[] = { -+ [AuBrWh_BASE] = QSTR_INIT(AUFS_BASE_NAME, -+ sizeof(AUFS_BASE_NAME) - 1), -+ [AuBrWh_PLINK] = QSTR_INIT(AUFS_PLINKDIR_NAME, -+ sizeof(AUFS_PLINKDIR_NAME) - 1), -+ [AuBrWh_ORPH] = QSTR_INIT(AUFS_ORPHDIR_NAME, -+ sizeof(AUFS_ORPHDIR_NAME) - 1) -+ }; -+ struct au_wh_base base[] = { -+ [AuBrWh_BASE] = { -+ .name = base_name + AuBrWh_BASE, -+ .dentry = NULL -+ }, -+ [AuBrWh_PLINK] = { -+ .name = base_name + AuBrWh_PLINK, -+ .dentry = NULL -+ }, -+ [AuBrWh_ORPH] = { -+ .name = base_name + AuBrWh_ORPH, -+ .dentry = NULL -+ } -+ }; -+ -+ if (wbr) -+ WbrWhMustWriteLock(wbr); -+ -+ for (i = 0; i < AuBrWh_Last; i++) { -+ /* doubly whiteouted */ -+ struct dentry *d; -+ -+ d = au_wh_lkup(h_root, (void *)base[i].name, br); -+ err = PTR_ERR(d); -+ if (IS_ERR(d)) -+ goto out; -+ -+ base[i].dentry = d; -+ AuDebugOn(wbr -+ && wbr->wbr_wh[i] -+ && wbr->wbr_wh[i] != base[i].dentry); -+ } -+ -+ if (wbr) -+ for (i = 0; i < AuBrWh_Last; i++) { -+ dput(wbr->wbr_wh[i]); -+ wbr->wbr_wh[i] = NULL; -+ } -+ -+ err = 0; -+ if (!au_br_writable(br->br_perm)) { -+ h_dir = d_inode(h_root); -+ au_wh_init_ro(h_dir, base, &path); -+ } else if (!au_br_wh_linkable(br->br_perm)) { -+ err = au_wh_init_rw_nolink(h_root, wbr, do_plink, base, &path); -+ if (err > 0) -+ goto out; -+ else if (err) -+ goto out_err; -+ } else { -+ err = au_wh_init_rw(h_root, wbr, do_plink, base, &path); -+ if (err > 0) -+ goto out; -+ else if (err) -+ goto out_err; -+ } -+ goto out; /* success */ -+ -+out_err: -+ pr_err("an error(%d) on the writable branch %pd(%s)\n", -+ err, h_root, au_sbtype(h_root->d_sb)); -+out: -+ for (i = 0; i < AuBrWh_Last; i++) -+ dput(base[i].dentry); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+/* -+ * whiteouts are all hard-linked usually. -+ * when its link count reaches a ceiling, we create a new whiteout base -+ * asynchronously. -+ */ -+ -+struct reinit_br_wh { -+ struct super_block *sb; -+ struct au_branch *br; -+}; -+ -+static void reinit_br_wh(void *arg) -+{ -+ int err; -+ aufs_bindex_t bindex; -+ struct path h_path; -+ struct reinit_br_wh *a = arg; -+ struct au_wbr *wbr; -+ struct inode *dir, *delegated; -+ struct dentry *h_root; -+ struct au_hinode *hdir; -+ -+ err = 0; -+ wbr = a->br->br_wbr; -+ /* big aufs lock */ -+ si_noflush_write_lock(a->sb); -+ if (!au_br_writable(a->br->br_perm)) -+ goto out; -+ bindex = au_br_index(a->sb, a->br->br_id); -+ if (unlikely(bindex < 0)) -+ goto out; -+ -+ di_read_lock_parent(a->sb->s_root, AuLock_IR); -+ dir = d_inode(a->sb->s_root); -+ hdir = au_hi(dir, bindex); -+ h_root = au_h_dptr(a->sb->s_root, bindex); -+ AuDebugOn(h_root != au_br_dentry(a->br)); -+ -+ au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); -+ wbr_wh_write_lock(wbr); -+ err = au_h_verify(wbr->wbr_whbase, au_opt_udba(a->sb), hdir->hi_inode, -+ h_root, a->br); -+ if (!err) { -+ h_path.dentry = wbr->wbr_whbase; -+ h_path.mnt = au_br_mnt(a->br); -+ delegated = NULL; -+ err = vfsub_unlink(hdir->hi_inode, &h_path, &delegated, -+ /*force*/0); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal unlink\n"); -+ iput(delegated); -+ } -+ } else { -+ pr_warn("%pd is moved, ignored\n", wbr->wbr_whbase); -+ err = 0; -+ } -+ dput(wbr->wbr_whbase); -+ wbr->wbr_whbase = NULL; -+ if (!err) -+ err = au_wh_init(a->br, a->sb); -+ wbr_wh_write_unlock(wbr); -+ au_hn_inode_unlock(hdir); -+ di_read_unlock(a->sb->s_root, AuLock_IR); -+ if (!err) -+ au_fhsm_wrote(a->sb, bindex, /*force*/0); -+ -+out: -+ if (wbr) -+ atomic_dec(&wbr->wbr_wh_running); -+ au_lcnt_dec(&a->br->br_count); -+ si_write_unlock(a->sb); -+ au_nwt_done(&au_sbi(a->sb)->si_nowait); -+ au_kfree_rcu(a); -+ if (unlikely(err)) -+ AuIOErr("err %d\n", err); -+} -+ -+static void kick_reinit_br_wh(struct super_block *sb, struct au_branch *br) -+{ -+ int do_dec, wkq_err; -+ struct reinit_br_wh *arg; -+ -+ do_dec = 1; -+ if (atomic_inc_return(&br->br_wbr->wbr_wh_running) != 1) -+ goto out; -+ -+ /* ignore ENOMEM */ -+ arg = kmalloc(sizeof(*arg), GFP_NOFS); -+ if (arg) { -+ /* -+ * dec(wh_running), kfree(arg) and dec(br_count) -+ * in reinit function -+ */ -+ arg->sb = sb; -+ arg->br = br; -+ au_lcnt_inc(&br->br_count); -+ wkq_err = au_wkq_nowait(reinit_br_wh, arg, sb, /*flags*/0); -+ if (unlikely(wkq_err)) { -+ atomic_dec(&br->br_wbr->wbr_wh_running); -+ au_lcnt_dec(&br->br_count); -+ au_kfree_rcu(arg); -+ } -+ do_dec = 0; -+ } -+ -+out: -+ if (do_dec) -+ atomic_dec(&br->br_wbr->wbr_wh_running); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * create the whiteout @wh. -+ */ -+static int link_or_create_wh(struct super_block *sb, aufs_bindex_t bindex, -+ struct dentry *wh) -+{ -+ int err; -+ struct path h_path = { -+ .dentry = wh -+ }; -+ struct au_branch *br; -+ struct au_wbr *wbr; -+ struct dentry *h_parent; -+ struct inode *h_dir, *delegated; -+ -+ h_parent = wh->d_parent; /* dir inode is locked */ -+ h_dir = d_inode(h_parent); -+ IMustLock(h_dir); -+ -+ br = au_sbr(sb, bindex); -+ h_path.mnt = au_br_mnt(br); -+ wbr = br->br_wbr; -+ wbr_wh_read_lock(wbr); -+ if (wbr->wbr_whbase) { -+ delegated = NULL; -+ err = vfsub_link(wbr->wbr_whbase, h_dir, &h_path, &delegated); -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal link\n"); -+ iput(delegated); -+ } -+ if (!err || err != -EMLINK) -+ goto out; -+ -+ /* link count full. re-initialize br_whbase. */ -+ kick_reinit_br_wh(sb, br); -+ } -+ -+ /* return this error in this context */ -+ err = vfsub_create(h_dir, &h_path, WH_MASK, /*want_excl*/true); -+ if (!err) -+ au_fhsm_wrote(sb, bindex, /*force*/0); -+ -+out: -+ wbr_wh_read_unlock(wbr); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * create or remove the diropq. -+ */ -+static struct dentry *do_diropq(struct dentry *dentry, aufs_bindex_t bindex, -+ unsigned int flags) -+{ -+ struct dentry *opq_dentry, *h_dentry; -+ struct super_block *sb; -+ struct au_branch *br; -+ int err; -+ -+ sb = dentry->d_sb; -+ br = au_sbr(sb, bindex); -+ h_dentry = au_h_dptr(dentry, bindex); -+ opq_dentry = vfsub_lkup_one(&diropq_name, h_dentry); -+ if (IS_ERR(opq_dentry)) -+ goto out; -+ -+ if (au_ftest_diropq(flags, CREATE)) { -+ err = link_or_create_wh(sb, bindex, opq_dentry); -+ if (!err) { -+ au_set_dbdiropq(dentry, bindex); -+ goto out; /* success */ -+ } -+ } else { -+ struct path tmp = { -+ .dentry = opq_dentry, -+ .mnt = au_br_mnt(br) -+ }; -+ err = do_unlink_wh(au_h_iptr(d_inode(dentry), bindex), &tmp); -+ if (!err) -+ au_set_dbdiropq(dentry, -1); -+ } -+ dput(opq_dentry); -+ opq_dentry = ERR_PTR(err); -+ -+out: -+ return opq_dentry; -+} -+ -+struct do_diropq_args { -+ struct dentry **errp; -+ struct dentry *dentry; -+ aufs_bindex_t bindex; -+ unsigned int flags; -+}; -+ -+static void call_do_diropq(void *args) -+{ -+ struct do_diropq_args *a = args; -+ *a->errp = do_diropq(a->dentry, a->bindex, a->flags); -+} -+ -+struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex, -+ unsigned int flags) -+{ -+ struct dentry *diropq, *h_dentry; -+ -+ h_dentry = au_h_dptr(dentry, bindex); -+ if (!au_test_h_perm_sio(d_inode(h_dentry), MAY_EXEC | MAY_WRITE)) -+ diropq = do_diropq(dentry, bindex, flags); -+ else { -+ int wkq_err; -+ struct do_diropq_args args = { -+ .errp = &diropq, -+ .dentry = dentry, -+ .bindex = bindex, -+ .flags = flags -+ }; -+ -+ wkq_err = au_wkq_wait(call_do_diropq, &args); -+ if (unlikely(wkq_err)) -+ diropq = ERR_PTR(wkq_err); -+ } -+ -+ return diropq; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * lookup whiteout dentry. -+ * @h_parent: lower parent dentry which must exist and be locked -+ * @base_name: name of dentry which will be whiteouted -+ * returns dentry for whiteout. -+ */ -+struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name, -+ struct au_branch *br) -+{ -+ int err; -+ struct qstr wh_name; -+ struct dentry *wh_dentry; -+ -+ err = au_wh_name_alloc(&wh_name, base_name); -+ wh_dentry = ERR_PTR(err); -+ if (!err) { -+ wh_dentry = vfsub_lkup_one(&wh_name, h_parent); -+ au_kfree_try_rcu(wh_name.name); -+ } -+ return wh_dentry; -+} -+ -+/* -+ * link/create a whiteout for @dentry on @bindex. -+ */ -+struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex, -+ struct dentry *h_parent) -+{ -+ struct dentry *wh_dentry; -+ struct super_block *sb; -+ int err; -+ -+ sb = dentry->d_sb; -+ wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, au_sbr(sb, bindex)); -+ if (!IS_ERR(wh_dentry) && d_is_negative(wh_dentry)) { -+ err = link_or_create_wh(sb, bindex, wh_dentry); -+ if (!err) { -+ au_set_dbwh(dentry, bindex); -+ au_fhsm_wrote(sb, bindex, /*force*/0); -+ } else { -+ dput(wh_dentry); -+ wh_dentry = ERR_PTR(err); -+ } -+ } -+ -+ return wh_dentry; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* Delete all whiteouts in this directory on branch bindex. */ -+static int del_wh_children(struct dentry *h_dentry, struct au_nhash *whlist, -+ aufs_bindex_t bindex, struct au_branch *br) -+{ -+ int err; -+ unsigned long ul, n; -+ struct qstr wh_name; -+ char *p; -+ struct hlist_head *head; -+ struct au_vdir_wh *pos; -+ struct au_vdir_destr *str; -+ -+ err = -ENOMEM; -+ p = (void *)__get_free_page(GFP_NOFS); -+ wh_name.name = p; -+ if (unlikely(!wh_name.name)) -+ goto out; -+ -+ err = 0; -+ memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); -+ p += AUFS_WH_PFX_LEN; -+ n = whlist->nh_num; -+ head = whlist->nh_head; -+ for (ul = 0; !err && ul < n; ul++, head++) { -+ hlist_for_each_entry(pos, head, wh_hash) { -+ if (pos->wh_bindex != bindex) -+ continue; -+ -+ str = &pos->wh_str; -+ if (str->len + AUFS_WH_PFX_LEN <= PATH_MAX) { -+ memcpy(p, str->name, str->len); -+ wh_name.len = AUFS_WH_PFX_LEN + str->len; -+ err = unlink_wh_name(h_dentry, &wh_name, br); -+ if (!err) -+ continue; -+ break; -+ } -+ AuIOErr("whiteout name too long %.*s\n", -+ str->len, str->name); -+ err = -EIO; -+ break; -+ } -+ } -+ free_page((unsigned long)wh_name.name); -+ -+out: -+ return err; -+} -+ -+struct del_wh_children_args { -+ int *errp; -+ struct dentry *h_dentry; -+ struct au_nhash *whlist; -+ aufs_bindex_t bindex; -+ struct au_branch *br; -+}; -+ -+static void call_del_wh_children(void *args) -+{ -+ struct del_wh_children_args *a = args; -+ *a->errp = del_wh_children(a->h_dentry, a->whlist, a->bindex, a->br); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp) -+{ -+ struct au_whtmp_rmdir *whtmp; -+ int err; -+ unsigned int rdhash; -+ -+ SiMustAnyLock(sb); -+ -+ whtmp = kzalloc(sizeof(*whtmp), gfp); -+ if (unlikely(!whtmp)) { -+ whtmp = ERR_PTR(-ENOMEM); -+ goto out; -+ } -+ -+ /* no estimation for dir size */ -+ rdhash = au_sbi(sb)->si_rdhash; -+ if (!rdhash) -+ rdhash = AUFS_RDHASH_DEF; -+ err = au_nhash_alloc(&whtmp->whlist, rdhash, gfp); -+ if (unlikely(err)) { -+ au_kfree_rcu(whtmp); -+ whtmp = ERR_PTR(err); -+ } -+ -+out: -+ return whtmp; -+} -+ -+void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp) -+{ -+ if (whtmp->br) -+ au_lcnt_dec(&whtmp->br->br_count); -+ dput(whtmp->wh_dentry); -+ iput(whtmp->dir); -+ au_nhash_wh_free(&whtmp->whlist); -+ au_kfree_rcu(whtmp); -+} -+ -+/* -+ * rmdir the whiteouted temporary named dir @h_dentry. -+ * @whlist: whiteouted children. -+ */ -+int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex, -+ struct dentry *wh_dentry, struct au_nhash *whlist) -+{ -+ int err; -+ unsigned int h_nlink; -+ struct path h_tmp; -+ struct inode *wh_inode, *h_dir; -+ struct au_branch *br; -+ -+ h_dir = d_inode(wh_dentry->d_parent); /* dir inode is locked */ -+ IMustLock(h_dir); -+ -+ br = au_sbr(dir->i_sb, bindex); -+ wh_inode = d_inode(wh_dentry); -+ inode_lock_nested(wh_inode, AuLsc_I_CHILD); -+ -+ /* -+ * someone else might change some whiteouts while we were sleeping. -+ * it means this whlist may have an obsoleted entry. -+ */ -+ if (!au_test_h_perm_sio(wh_inode, MAY_EXEC | MAY_WRITE)) -+ err = del_wh_children(wh_dentry, whlist, bindex, br); -+ else { -+ int wkq_err; -+ struct del_wh_children_args args = { -+ .errp = &err, -+ .h_dentry = wh_dentry, -+ .whlist = whlist, -+ .bindex = bindex, -+ .br = br -+ }; -+ -+ wkq_err = au_wkq_wait(call_del_wh_children, &args); -+ if (unlikely(wkq_err)) -+ err = wkq_err; -+ } -+ inode_unlock(wh_inode); -+ -+ if (!err) { -+ h_tmp.dentry = wh_dentry; -+ h_tmp.mnt = au_br_mnt(br); -+ h_nlink = h_dir->i_nlink; -+ err = vfsub_rmdir(h_dir, &h_tmp); -+ /* some fs doesn't change the parent nlink in some cases */ -+ h_nlink -= h_dir->i_nlink; -+ } -+ -+ if (!err) { -+ if (au_ibtop(dir) == bindex) { -+ /* todo: dir->i_mutex is necessary */ -+ au_cpup_attr_timesizes(dir); -+ if (h_nlink) -+ vfsub_drop_nlink(dir); -+ } -+ return 0; /* success */ -+ } -+ -+ pr_warn("failed removing %pd(%d), ignored\n", wh_dentry, err); -+ return err; -+} -+ -+static void call_rmdir_whtmp(void *args) -+{ -+ int err; -+ aufs_bindex_t bindex; -+ struct au_whtmp_rmdir *a = args; -+ struct super_block *sb; -+ struct dentry *h_parent; -+ struct inode *h_dir; -+ struct au_hinode *hdir; -+ -+ /* rmdir by nfsd may cause deadlock with this i_mutex */ -+ /* inode_lock(a->dir); */ -+ err = -EROFS; -+ sb = a->dir->i_sb; -+ si_read_lock(sb, !AuLock_FLUSH); -+ if (!au_br_writable(a->br->br_perm)) -+ goto out; -+ bindex = au_br_index(sb, a->br->br_id); -+ if (unlikely(bindex < 0)) -+ goto out; -+ -+ err = -EIO; -+ ii_write_lock_parent(a->dir); -+ h_parent = dget_parent(a->wh_dentry); -+ h_dir = d_inode(h_parent); -+ hdir = au_hi(a->dir, bindex); -+ err = vfsub_mnt_want_write(au_br_mnt(a->br)); -+ if (unlikely(err)) -+ goto out_mnt; -+ au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); -+ err = au_h_verify(a->wh_dentry, au_opt_udba(sb), h_dir, h_parent, -+ a->br); -+ if (!err) -+ err = au_whtmp_rmdir(a->dir, bindex, a->wh_dentry, &a->whlist); -+ au_hn_inode_unlock(hdir); -+ vfsub_mnt_drop_write(au_br_mnt(a->br)); -+ -+out_mnt: -+ dput(h_parent); -+ ii_write_unlock(a->dir); -+out: -+ /* inode_unlock(a->dir); */ -+ au_whtmp_rmdir_free(a); -+ si_read_unlock(sb); -+ au_nwt_done(&au_sbi(sb)->si_nowait); -+ if (unlikely(err)) -+ AuIOErr("err %d\n", err); -+} -+ -+void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex, -+ struct dentry *wh_dentry, struct au_whtmp_rmdir *args) -+{ -+ int wkq_err; -+ struct super_block *sb; -+ -+ IMustLock(dir); -+ -+ /* all post-process will be done in do_rmdir_whtmp(). */ -+ sb = dir->i_sb; -+ args->dir = au_igrab(dir); -+ args->br = au_sbr(sb, bindex); -+ au_lcnt_inc(&args->br->br_count); -+ args->wh_dentry = dget(wh_dentry); -+ wkq_err = au_wkq_nowait(call_rmdir_whtmp, args, sb, /*flags*/0); -+ if (unlikely(wkq_err)) { -+ pr_warn("rmdir error %pd (%d), ignored\n", wh_dentry, wkq_err); -+ au_whtmp_rmdir_free(args); -+ } -+} -diff --git a/fs/aufs/whout.h b/fs/aufs/whout.h -new file mode 100644 -index 000000000000..06f69b24e5c1 ---- /dev/null -+++ b/fs/aufs/whout.h -@@ -0,0 +1,86 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * whiteout for logical deletion and opaque directory -+ */ -+ -+#ifndef __AUFS_WHOUT_H__ -+#define __AUFS_WHOUT_H__ -+ -+#ifdef __KERNEL__ -+ -+#include "dir.h" -+ -+/* whout.c */ -+int au_wh_name_alloc(struct qstr *wh, const struct qstr *name); -+int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, int try_sio); -+int au_diropq_test(struct dentry *h_dentry); -+struct au_branch; -+struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br, -+ struct qstr *prefix); -+int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br); -+int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path, -+ struct dentry *dentry); -+int au_wh_init(struct au_branch *br, struct super_block *sb); -+ -+/* diropq flags */ -+#define AuDiropq_CREATE 1 -+#define au_ftest_diropq(flags, name) ((flags) & AuDiropq_##name) -+#define au_fset_diropq(flags, name) \ -+ do { (flags) |= AuDiropq_##name; } while (0) -+#define au_fclr_diropq(flags, name) \ -+ do { (flags) &= ~AuDiropq_##name; } while (0) -+ -+struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex, -+ unsigned int flags); -+struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name, -+ struct au_branch *br); -+struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex, -+ struct dentry *h_parent); -+ -+/* real rmdir for the whiteout-ed dir */ -+struct au_whtmp_rmdir { -+ struct inode *dir; -+ struct au_branch *br; -+ struct dentry *wh_dentry; -+ struct au_nhash whlist; -+}; -+ -+struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp); -+void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp); -+int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex, -+ struct dentry *wh_dentry, struct au_nhash *whlist); -+void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex, -+ struct dentry *wh_dentry, struct au_whtmp_rmdir *args); -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline struct dentry *au_diropq_create(struct dentry *dentry, -+ aufs_bindex_t bindex) -+{ -+ return au_diropq_sio(dentry, bindex, AuDiropq_CREATE); -+} -+ -+static inline int au_diropq_remove(struct dentry *dentry, aufs_bindex_t bindex) -+{ -+ return PTR_ERR(au_diropq_sio(dentry, bindex, !AuDiropq_CREATE)); -+} -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_WHOUT_H__ */ -diff --git a/fs/aufs/wkq.c b/fs/aufs/wkq.c -new file mode 100644 -index 000000000000..b0dd8df4e414 ---- /dev/null -+++ b/fs/aufs/wkq.c -@@ -0,0 +1,392 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * workqueue for asynchronous/super-io operations -+ * todo: try new credential scheme -+ */ -+ -+#include <linux/module.h> -+#include "aufs.h" -+ -+/* internal workqueue named AUFS_WKQ_NAME */ -+ -+static struct workqueue_struct *au_wkq; -+ -+struct au_wkinfo { -+ struct work_struct wk; -+ struct kobject *kobj; -+ -+ unsigned int flags; /* see wkq.h */ -+ -+ au_wkq_func_t func; -+ void *args; -+ -+#ifdef CONFIG_LOCKDEP -+ int dont_check; -+ struct held_lock **hlock; -+#endif -+ -+ struct completion *comp; -+}; -+ -+/* ---------------------------------------------------------------------- */ -+/* -+ * Aufs passes some operations to the workqueue such as the internal copyup. -+ * This scheme looks rather unnatural for LOCKDEP debugging feature, since the -+ * job run by workqueue depends upon the locks acquired in the other task. -+ * Delegating a small operation to the workqueue, aufs passes its lockdep -+ * information too. And the job in the workqueue restores the info in order to -+ * pretend as if it acquired those locks. This is just to make LOCKDEP work -+ * correctly and expectedly. -+ */ -+ -+#ifndef CONFIG_LOCKDEP -+AuStubInt0(au_wkq_lockdep_alloc, struct au_wkinfo *wkinfo); -+AuStubVoid(au_wkq_lockdep_free, struct au_wkinfo *wkinfo); -+AuStubVoid(au_wkq_lockdep_pre, struct au_wkinfo *wkinfo); -+AuStubVoid(au_wkq_lockdep_post, struct au_wkinfo *wkinfo); -+AuStubVoid(au_wkq_lockdep_init, struct au_wkinfo *wkinfo); -+#else -+static void au_wkq_lockdep_init(struct au_wkinfo *wkinfo) -+{ -+ wkinfo->hlock = NULL; -+ wkinfo->dont_check = 0; -+} -+ -+/* -+ * 1: matched -+ * 0: unmatched -+ */ -+static int au_wkq_lockdep_test(struct lock_class_key *key, const char *name) -+{ -+ static DEFINE_SPINLOCK(spin); -+ static struct { -+ char *name; -+ struct lock_class_key *key; -+ } a[] = { -+ { .name = "&sbinfo->si_rwsem" }, -+ { .name = "&finfo->fi_rwsem" }, -+ { .name = "&dinfo->di_rwsem" }, -+ { .name = "&iinfo->ii_rwsem" } -+ }; -+ static int set; -+ int i; -+ -+ /* lockless read from 'set.' see below */ -+ if (set == ARRAY_SIZE(a)) { -+ for (i = 0; i < ARRAY_SIZE(a); i++) -+ if (a[i].key == key) -+ goto match; -+ goto unmatch; -+ } -+ -+ spin_lock(&spin); -+ if (set) -+ for (i = 0; i < ARRAY_SIZE(a); i++) -+ if (a[i].key == key) { -+ spin_unlock(&spin); -+ goto match; -+ } -+ for (i = 0; i < ARRAY_SIZE(a); i++) { -+ if (a[i].key) { -+ if (unlikely(a[i].key == key)) { /* rare but possible */ -+ spin_unlock(&spin); -+ goto match; -+ } else -+ continue; -+ } -+ if (strstr(a[i].name, name)) { -+ /* -+ * the order of these three lines is important for the -+ * lockless read above. -+ */ -+ a[i].key = key; -+ spin_unlock(&spin); -+ set++; -+ /* AuDbg("%d, %s\n", set, name); */ -+ goto match; -+ } -+ } -+ spin_unlock(&spin); -+ goto unmatch; -+ -+match: -+ return 1; -+unmatch: -+ return 0; -+} -+ -+static int au_wkq_lockdep_alloc(struct au_wkinfo *wkinfo) -+{ -+ int err, n; -+ struct task_struct *curr; -+ struct held_lock **hl, *held_locks, *p; -+ -+ err = 0; -+ curr = current; -+ wkinfo->dont_check = lockdep_recursing(curr); -+ if (wkinfo->dont_check) -+ goto out; -+ n = curr->lockdep_depth; -+ if (!n) -+ goto out; -+ -+ err = -ENOMEM; -+ wkinfo->hlock = kmalloc_array(n + 1, sizeof(*wkinfo->hlock), GFP_NOFS); -+ if (unlikely(!wkinfo->hlock)) -+ goto out; -+ -+ err = 0; -+#if 0 -+ if (0 && au_debug_test()) /* left for debugging */ -+ lockdep_print_held_locks(curr); -+#endif -+ held_locks = curr->held_locks; -+ hl = wkinfo->hlock; -+ while (n--) { -+ p = held_locks++; -+ if (au_wkq_lockdep_test(p->instance->key, p->instance->name)) -+ *hl++ = p; -+ } -+ *hl = NULL; -+ -+out: -+ return err; -+} -+ -+static void au_wkq_lockdep_free(struct au_wkinfo *wkinfo) -+{ -+ au_kfree_try_rcu(wkinfo->hlock); -+} -+ -+static void au_wkq_lockdep_pre(struct au_wkinfo *wkinfo) -+{ -+ struct held_lock *p, **hl = wkinfo->hlock; -+ int subclass; -+ -+ if (wkinfo->dont_check) -+ lockdep_off(); -+ if (!hl) -+ return; -+ while ((p = *hl++)) { /* assignment */ -+ subclass = lockdep_hlock_class(p)->subclass; -+ /* AuDbg("%s, %d\n", p->instance->name, subclass); */ -+ if (p->read) -+ rwsem_acquire_read(p->instance, subclass, 0, -+ /*p->acquire_ip*/_RET_IP_); -+ else -+ rwsem_acquire(p->instance, subclass, 0, -+ /*p->acquire_ip*/_RET_IP_); -+ } -+} -+ -+static void au_wkq_lockdep_post(struct au_wkinfo *wkinfo) -+{ -+ struct held_lock *p, **hl = wkinfo->hlock; -+ -+ if (wkinfo->dont_check) -+ lockdep_on(); -+ if (!hl) -+ return; -+ while ((p = *hl++)) /* assignment */ -+ rwsem_release(p->instance, 0, /*p->acquire_ip*/_RET_IP_); -+} -+#endif -+ -+static void wkq_func(struct work_struct *wk) -+{ -+ struct au_wkinfo *wkinfo = container_of(wk, struct au_wkinfo, wk); -+ -+ AuDebugOn(!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)); -+ AuDebugOn(rlimit(RLIMIT_FSIZE) != RLIM_INFINITY); -+ -+ au_wkq_lockdep_pre(wkinfo); -+ wkinfo->func(wkinfo->args); -+ au_wkq_lockdep_post(wkinfo); -+ if (au_ftest_wkq(wkinfo->flags, WAIT)) -+ complete(wkinfo->comp); -+ else { -+ kobject_put(wkinfo->kobj); -+ module_put(THIS_MODULE); /* todo: ?? */ -+ au_kfree_rcu(wkinfo); -+ } -+} -+ -+/* -+ * Since struct completion is large, try allocating it dynamically. -+ */ -+#if 1 /* defined(CONFIG_4KSTACKS) || defined(AuTest4KSTACKS) */ -+#define AuWkqCompDeclare(name) struct completion *comp = NULL -+ -+static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp) -+{ -+ *comp = kmalloc(sizeof(**comp), GFP_NOFS); -+ if (*comp) { -+ init_completion(*comp); -+ wkinfo->comp = *comp; -+ return 0; -+ } -+ return -ENOMEM; -+} -+ -+static void au_wkq_comp_free(struct completion *comp) -+{ -+ au_kfree_rcu(comp); -+} -+ -+#else -+ -+/* no braces */ -+#define AuWkqCompDeclare(name) \ -+ DECLARE_COMPLETION_ONSTACK(_ ## name); \ -+ struct completion *comp = &_ ## name -+ -+static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp) -+{ -+ wkinfo->comp = *comp; -+ return 0; -+} -+ -+static void au_wkq_comp_free(struct completion *comp __maybe_unused) -+{ -+ /* empty */ -+} -+#endif /* 4KSTACKS */ -+ -+static void au_wkq_run(struct au_wkinfo *wkinfo) -+{ -+ if (au_ftest_wkq(wkinfo->flags, NEST)) { -+ if (au_wkq_test()) { -+ AuWarn1("wkq from wkq, unless silly-rename on NFS," -+ " due to a dead dir by UDBA," -+ " or async xino write?\n"); -+ AuDebugOn(au_ftest_wkq(wkinfo->flags, WAIT)); -+ } -+ } else -+ au_dbg_verify_kthread(); -+ -+ if (au_ftest_wkq(wkinfo->flags, WAIT)) { -+ INIT_WORK_ONSTACK(&wkinfo->wk, wkq_func); -+ queue_work(au_wkq, &wkinfo->wk); -+ } else { -+ INIT_WORK(&wkinfo->wk, wkq_func); -+ schedule_work(&wkinfo->wk); -+ } -+} -+ -+/* -+ * Be careful. It is easy to make deadlock happen. -+ * processA: lock, wkq and wait -+ * processB: wkq and wait, lock in wkq -+ * --> deadlock -+ */ -+int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args) -+{ -+ int err; -+ AuWkqCompDeclare(comp); -+ struct au_wkinfo wkinfo = { -+ .flags = flags, -+ .func = func, -+ .args = args -+ }; -+ -+ err = au_wkq_comp_alloc(&wkinfo, &comp); -+ if (unlikely(err)) -+ goto out; -+ err = au_wkq_lockdep_alloc(&wkinfo); -+ if (unlikely(err)) -+ goto out_comp; -+ if (!err) { -+ au_wkq_run(&wkinfo); -+ /* no timeout, no interrupt */ -+ wait_for_completion(wkinfo.comp); -+ } -+ au_wkq_lockdep_free(&wkinfo); -+ -+out_comp: -+ au_wkq_comp_free(comp); -+out: -+ destroy_work_on_stack(&wkinfo.wk); -+ return err; -+} -+ -+/* -+ * Note: dget/dput() in func for aufs dentries are not supported. It will be a -+ * problem in a concurrent umounting. -+ */ -+int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb, -+ unsigned int flags) -+{ -+ int err; -+ struct au_wkinfo *wkinfo; -+ -+ atomic_inc(&au_sbi(sb)->si_nowait.nw_len); -+ -+ /* -+ * wkq_func() must free this wkinfo. -+ * it highly depends upon the implementation of workqueue. -+ */ -+ err = 0; -+ wkinfo = kmalloc(sizeof(*wkinfo), GFP_NOFS); -+ if (wkinfo) { -+ wkinfo->kobj = &au_sbi(sb)->si_kobj; -+ wkinfo->flags = flags & ~AuWkq_WAIT; -+ wkinfo->func = func; -+ wkinfo->args = args; -+ wkinfo->comp = NULL; -+ au_wkq_lockdep_init(wkinfo); -+ kobject_get(wkinfo->kobj); -+ __module_get(THIS_MODULE); /* todo: ?? */ -+ -+ au_wkq_run(wkinfo); -+ } else { -+ err = -ENOMEM; -+ au_nwt_done(&au_sbi(sb)->si_nowait); -+ } -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+void au_nwt_init(struct au_nowait_tasks *nwt) -+{ -+ atomic_set(&nwt->nw_len, 0); -+ /* smp_mb(); */ /* atomic_set */ -+ init_waitqueue_head(&nwt->nw_wq); -+} -+ -+void au_wkq_fin(void) -+{ -+ destroy_workqueue(au_wkq); -+} -+ -+int __init au_wkq_init(void) -+{ -+ int err; -+ -+ err = 0; -+ au_wkq = alloc_workqueue(AUFS_WKQ_NAME, 0, WQ_DFL_ACTIVE); -+ if (IS_ERR(au_wkq)) -+ err = PTR_ERR(au_wkq); -+ else if (!au_wkq) -+ err = -ENOMEM; -+ -+ return err; -+} -diff --git a/fs/aufs/wkq.h b/fs/aufs/wkq.h -new file mode 100644 -index 000000000000..235370d91693 ---- /dev/null -+++ b/fs/aufs/wkq.h -@@ -0,0 +1,89 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * workqueue for asynchronous/super-io operations -+ * todo: try new credentials management scheme -+ */ -+ -+#ifndef __AUFS_WKQ_H__ -+#define __AUFS_WKQ_H__ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/wait.h> -+ -+struct super_block; -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * in the next operation, wait for the 'nowait' tasks in system-wide workqueue -+ */ -+struct au_nowait_tasks { -+ atomic_t nw_len; -+ wait_queue_head_t nw_wq; -+}; -+ -+/* ---------------------------------------------------------------------- */ -+ -+typedef void (*au_wkq_func_t)(void *args); -+ -+/* wkq flags */ -+#define AuWkq_WAIT 1 -+#define AuWkq_NEST (1 << 1) -+#define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name) -+#define au_fset_wkq(flags, name) \ -+ do { (flags) |= AuWkq_##name; } while (0) -+#define au_fclr_wkq(flags, name) \ -+ do { (flags) &= ~AuWkq_##name; } while (0) -+ -+/* wkq.c */ -+int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args); -+int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb, -+ unsigned int flags); -+void au_nwt_init(struct au_nowait_tasks *nwt); -+int __init au_wkq_init(void); -+void au_wkq_fin(void); -+ -+/* ---------------------------------------------------------------------- */ -+ -+static inline int au_wkq_test(void) -+{ -+ return current->flags & PF_WQ_WORKER; -+} -+ -+static inline int au_wkq_wait(au_wkq_func_t func, void *args) -+{ -+ return au_wkq_do_wait(AuWkq_WAIT, func, args); -+} -+ -+static inline void au_nwt_done(struct au_nowait_tasks *nwt) -+{ -+ if (atomic_dec_and_test(&nwt->nw_len)) -+ wake_up_all(&nwt->nw_wq); -+} -+ -+static inline int au_nwt_flush(struct au_nowait_tasks *nwt) -+{ -+ wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len)); -+ return 0; -+} -+ -+#endif /* __KERNEL__ */ -+#endif /* __AUFS_WKQ_H__ */ -diff --git a/fs/aufs/xattr.c b/fs/aufs/xattr.c -new file mode 100644 -index 000000000000..8e56b15c53b5 ---- /dev/null -+++ b/fs/aufs/xattr.c -@@ -0,0 +1,356 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2014-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * handling xattr functions -+ */ -+ -+#include <linux/fs.h> -+#include <linux/posix_acl_xattr.h> -+#include <linux/xattr.h> -+#include "aufs.h" -+ -+static int au_xattr_ignore(int err, char *name, unsigned int ignore_flags) -+{ -+ if (!ignore_flags) -+ goto out; -+ switch (err) { -+ case -ENOMEM: -+ case -EDQUOT: -+ goto out; -+ } -+ -+ if ((ignore_flags & AuBrAttr_ICEX) == AuBrAttr_ICEX) { -+ err = 0; -+ goto out; -+ } -+ -+#define cmp(brattr, prefix) do { \ -+ if (!strncmp(name, XATTR_##prefix##_PREFIX, \ -+ XATTR_##prefix##_PREFIX_LEN)) { \ -+ if (ignore_flags & AuBrAttr_ICEX_##brattr) \ -+ err = 0; \ -+ goto out; \ -+ } \ -+ } while (0) -+ -+ cmp(SEC, SECURITY); -+ cmp(SYS, SYSTEM); -+ cmp(TR, TRUSTED); -+ cmp(USR, USER); -+#undef cmp -+ -+ if (ignore_flags & AuBrAttr_ICEX_OTH) -+ err = 0; -+ -+out: -+ return err; -+} -+ -+static const int au_xattr_out_of_list = AuBrAttr_ICEX_OTH << 1; -+ -+static int au_do_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, -+ char *name, char **buf, unsigned int ignore_flags, -+ unsigned int verbose) -+{ -+ int err; -+ ssize_t ssz; -+ struct inode *h_idst; -+ -+ ssz = vfs_getxattr_alloc(h_src, name, buf, 0, GFP_NOFS); -+ err = ssz; -+ if (unlikely(err <= 0)) { -+ if (err == -ENODATA -+ || (err == -EOPNOTSUPP -+ && ((ignore_flags & au_xattr_out_of_list) -+ || (au_test_nfs_noacl(d_inode(h_src)) -+ && (!strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) -+ || !strcmp(name, -+ XATTR_NAME_POSIX_ACL_DEFAULT)))) -+ )) -+ err = 0; -+ if (err && (verbose || au_debug_test())) -+ pr_err("%s, err %d\n", name, err); -+ goto out; -+ } -+ -+ /* unlock it temporary */ -+ h_idst = d_inode(h_dst); -+ inode_unlock(h_idst); -+ err = vfsub_setxattr(h_dst, name, *buf, ssz, /*flags*/0); -+ inode_lock_nested(h_idst, AuLsc_I_CHILD2); -+ if (unlikely(err)) { -+ if (verbose || au_debug_test()) -+ pr_err("%s, err %d\n", name, err); -+ err = au_xattr_ignore(err, name, ignore_flags); -+ } -+ -+out: -+ return err; -+} -+ -+int au_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, int ignore_flags, -+ unsigned int verbose) -+{ -+ int err, unlocked, acl_access, acl_default; -+ ssize_t ssz; -+ struct inode *h_isrc, *h_idst; -+ char *value, *p, *o, *e; -+ -+ /* try stopping to update the source inode while we are referencing */ -+ /* there should not be the parent-child relationship between them */ -+ h_isrc = d_inode(h_src); -+ h_idst = d_inode(h_dst); -+ inode_unlock(h_idst); -+ inode_lock_shared_nested(h_isrc, AuLsc_I_CHILD); -+ inode_lock_nested(h_idst, AuLsc_I_CHILD2); -+ unlocked = 0; -+ -+ /* some filesystems don't list POSIX ACL, for example tmpfs */ -+ ssz = vfs_listxattr(h_src, NULL, 0); -+ err = ssz; -+ if (unlikely(err < 0)) { -+ AuTraceErr(err); -+ if (err == -ENODATA -+ || err == -EOPNOTSUPP) -+ err = 0; /* ignore */ -+ goto out; -+ } -+ -+ err = 0; -+ p = NULL; -+ o = NULL; -+ if (ssz) { -+ err = -ENOMEM; -+ p = kmalloc(ssz, GFP_NOFS); -+ o = p; -+ if (unlikely(!p)) -+ goto out; -+ err = vfs_listxattr(h_src, p, ssz); -+ } -+ inode_unlock_shared(h_isrc); -+ unlocked = 1; -+ AuDbg("err %d, ssz %zd\n", err, ssz); -+ if (unlikely(err < 0)) -+ goto out_free; -+ -+ err = 0; -+ e = p + ssz; -+ value = NULL; -+ acl_access = 0; -+ acl_default = 0; -+ while (!err && p < e) { -+ acl_access |= !strncmp(p, XATTR_NAME_POSIX_ACL_ACCESS, -+ sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1); -+ acl_default |= !strncmp(p, XATTR_NAME_POSIX_ACL_DEFAULT, -+ sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) -+ - 1); -+ err = au_do_cpup_xattr(h_dst, h_src, p, &value, ignore_flags, -+ verbose); -+ p += strlen(p) + 1; -+ } -+ AuTraceErr(err); -+ ignore_flags |= au_xattr_out_of_list; -+ if (!err && !acl_access) { -+ err = au_do_cpup_xattr(h_dst, h_src, -+ XATTR_NAME_POSIX_ACL_ACCESS, &value, -+ ignore_flags, verbose); -+ AuTraceErr(err); -+ } -+ if (!err && !acl_default) { -+ err = au_do_cpup_xattr(h_dst, h_src, -+ XATTR_NAME_POSIX_ACL_DEFAULT, &value, -+ ignore_flags, verbose); -+ AuTraceErr(err); -+ } -+ -+ au_kfree_try_rcu(value); -+ -+out_free: -+ au_kfree_try_rcu(o); -+out: -+ if (!unlocked) -+ inode_unlock_shared(h_isrc); -+ AuTraceErr(err); -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_smack_reentering(struct super_block *sb) -+{ -+#if IS_ENABLED(CONFIG_SECURITY_SMACK) -+ /* -+ * as a part of lookup, smack_d_instantiate() is called, and it calls -+ * i_op->getxattr(). ouch. -+ */ -+ return si_pid_test(sb); -+#else -+ return 0; -+#endif -+} -+ -+enum { -+ AU_XATTR_LIST, -+ AU_XATTR_GET -+}; -+ -+struct au_lgxattr { -+ int type; -+ union { -+ struct { -+ char *list; -+ size_t size; -+ } list; -+ struct { -+ const char *name; -+ void *value; -+ size_t size; -+ } get; -+ } u; -+}; -+ -+static ssize_t au_lgxattr(struct dentry *dentry, struct au_lgxattr *arg) -+{ -+ ssize_t err; -+ int reenter; -+ struct path h_path; -+ struct super_block *sb; -+ -+ sb = dentry->d_sb; -+ reenter = au_smack_reentering(sb); -+ if (!reenter) { -+ err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); -+ if (unlikely(err)) -+ goto out; -+ } -+ err = au_h_path_getattr(dentry, /*force*/1, &h_path, reenter); -+ if (unlikely(err)) -+ goto out_si; -+ if (unlikely(!h_path.dentry)) -+ /* illegally overlapped or something */ -+ goto out_di; /* pretending success */ -+ -+ /* always topmost entry only */ -+ switch (arg->type) { -+ case AU_XATTR_LIST: -+ err = vfs_listxattr(h_path.dentry, -+ arg->u.list.list, arg->u.list.size); -+ break; -+ case AU_XATTR_GET: -+ AuDebugOn(d_is_negative(h_path.dentry)); -+ err = vfs_getxattr(h_path.dentry, -+ arg->u.get.name, arg->u.get.value, -+ arg->u.get.size); -+ break; -+ } -+ -+out_di: -+ if (!reenter) -+ di_read_unlock(dentry, AuLock_IR); -+out_si: -+ if (!reenter) -+ si_read_unlock(sb); -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t size) -+{ -+ struct au_lgxattr arg = { -+ .type = AU_XATTR_LIST, -+ .u.list = { -+ .list = list, -+ .size = size -+ }, -+ }; -+ -+ return au_lgxattr(dentry, &arg); -+} -+ -+static ssize_t au_getxattr(struct dentry *dentry, -+ struct inode *inode __maybe_unused, -+ const char *name, void *value, size_t size) -+{ -+ struct au_lgxattr arg = { -+ .type = AU_XATTR_GET, -+ .u.get = { -+ .name = name, -+ .value = value, -+ .size = size -+ }, -+ }; -+ -+ return au_lgxattr(dentry, &arg); -+} -+ -+static int au_setxattr(struct dentry *dentry, struct inode *inode, -+ const char *name, const void *value, size_t size, -+ int flags) -+{ -+ struct au_sxattr arg = { -+ .type = AU_XATTR_SET, -+ .u.set = { -+ .name = name, -+ .value = value, -+ .size = size, -+ .flags = flags -+ }, -+ }; -+ -+ return au_sxattr(dentry, inode, &arg); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_xattr_get(const struct xattr_handler *handler, -+ struct dentry *dentry, struct inode *inode, -+ const char *name, void *buffer, size_t size) -+{ -+ return au_getxattr(dentry, inode, name, buffer, size); -+} -+ -+static int au_xattr_set(const struct xattr_handler *handler, -+ struct dentry *dentry, struct inode *inode, -+ const char *name, const void *value, size_t size, -+ int flags) -+{ -+ return au_setxattr(dentry, inode, name, value, size, flags); -+} -+ -+static const struct xattr_handler au_xattr_handler = { -+ .name = "", -+ .prefix = "", -+ .get = au_xattr_get, -+ .set = au_xattr_set -+}; -+ -+static const struct xattr_handler *au_xattr_handlers[] = { -+#ifdef CONFIG_FS_POSIX_ACL -+ &posix_acl_access_xattr_handler, -+ &posix_acl_default_xattr_handler, -+#endif -+ &au_xattr_handler, /* must be last */ -+ NULL -+}; -+ -+void au_xattr_init(struct super_block *sb) -+{ -+ sb->s_xattr = au_xattr_handlers; -+} -diff --git a/fs/aufs/xino.c b/fs/aufs/xino.c -new file mode 100644 -index 000000000000..35ea33469d36 ---- /dev/null -+++ b/fs/aufs/xino.c -@@ -0,0 +1,1965 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+/* -+ * external inode number translation table and bitmap -+ * -+ * things to consider -+ * - the lifetime -+ * + au_xino object -+ * + XINO files (xino, xib, xigen) -+ * + dynamic debugfs entries (xiN) -+ * + static debugfs entries (xib, xigen) -+ * + static sysfs entry (xi_path) -+ * - several entry points to handle them. -+ * + mount(2) without xino option (default) -+ * + mount(2) with xino option -+ * + mount(2) with noxino option -+ * + umount(2) -+ * + remount with add/del branches -+ * + remount with xino/noxino options -+ */ -+ -+#include <linux/seq_file.h> -+#include <linux/statfs.h> -+#include "aufs.h" -+ -+static aufs_bindex_t sbr_find_shared(struct super_block *sb, aufs_bindex_t btop, -+ aufs_bindex_t bbot, -+ struct super_block *h_sb) -+{ -+ /* todo: try binary-search if the branches are many */ -+ for (; btop <= bbot; btop++) -+ if (h_sb == au_sbr_sb(sb, btop)) -+ return btop; -+ return -1; -+} -+ -+/* -+ * find another branch who is on the same filesystem of the specified -+ * branch{@btgt}. search until @bbot. -+ */ -+static aufs_bindex_t is_sb_shared(struct super_block *sb, aufs_bindex_t btgt, -+ aufs_bindex_t bbot) -+{ -+ aufs_bindex_t bindex; -+ struct super_block *tgt_sb; -+ -+ tgt_sb = au_sbr_sb(sb, btgt); -+ bindex = sbr_find_shared(sb, /*btop*/0, btgt - 1, tgt_sb); -+ if (bindex < 0) -+ bindex = sbr_find_shared(sb, btgt + 1, bbot, tgt_sb); -+ -+ return bindex; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * stop unnecessary notify events at creating xino files -+ */ -+ -+aufs_bindex_t au_xi_root(struct super_block *sb, struct dentry *dentry) -+{ -+ aufs_bindex_t bfound, bindex, bbot; -+ struct dentry *parent; -+ struct au_branch *br; -+ -+ bfound = -1; -+ parent = dentry->d_parent; /* safe d_parent access */ -+ bbot = au_sbbot(sb); -+ for (bindex = 0; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ if (au_br_dentry(br) == parent) { -+ bfound = bindex; -+ break; -+ } -+ } -+ -+ AuDbg("bfound b%d\n", bfound); -+ return bfound; -+} -+ -+struct au_xino_lock_dir { -+ struct au_hinode *hdir; -+ struct dentry *parent; -+ struct inode *dir; -+}; -+ -+static struct dentry *au_dget_parent_lock(struct dentry *dentry, -+ unsigned int lsc) -+{ -+ struct dentry *parent; -+ struct inode *dir; -+ -+ parent = dget_parent(dentry); -+ dir = d_inode(parent); -+ inode_lock_nested(dir, lsc); -+#if 0 /* it should not happen */ -+ spin_lock(&dentry->d_lock); -+ if (unlikely(dentry->d_parent != parent)) { -+ spin_unlock(&dentry->d_lock); -+ inode_unlock(dir); -+ dput(parent); -+ parent = NULL; -+ goto out; -+ } -+ spin_unlock(&dentry->d_lock); -+ -+out: -+#endif -+ return parent; -+} -+ -+static void au_xino_lock_dir(struct super_block *sb, struct path *xipath, -+ struct au_xino_lock_dir *ldir) -+{ -+ aufs_bindex_t bindex; -+ -+ ldir->hdir = NULL; -+ bindex = au_xi_root(sb, xipath->dentry); -+ if (bindex >= 0) { -+ /* rw branch root */ -+ ldir->hdir = au_hi(d_inode(sb->s_root), bindex); -+ au_hn_inode_lock_nested(ldir->hdir, AuLsc_I_PARENT); -+ } else { -+ /* other */ -+ ldir->parent = au_dget_parent_lock(xipath->dentry, -+ AuLsc_I_PARENT); -+ ldir->dir = d_inode(ldir->parent); -+ } -+} -+ -+static void au_xino_unlock_dir(struct au_xino_lock_dir *ldir) -+{ -+ if (ldir->hdir) -+ au_hn_inode_unlock(ldir->hdir); -+ else { -+ inode_unlock(ldir->dir); -+ dput(ldir->parent); -+ } -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * create and set a new xino file -+ */ -+struct file *au_xino_create(struct super_block *sb, char *fpath, int silent, -+ int wbrtop) -+{ -+ struct file *file; -+ struct dentry *h_parent, *d; -+ struct inode *h_dir, *inode; -+ int err; -+ static DEFINE_MUTEX(mtx); -+ -+ /* -+ * at mount-time, and the xino file is the default path, -+ * hnotify is disabled so we have no notify events to ignore. -+ * when a user specified the xino, we cannot get au_hdir to be ignored. -+ */ -+ if (!wbrtop) -+ mutex_lock(&mtx); -+ file = vfsub_filp_open(fpath, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE -+ /* | __FMODE_NONOTIFY */, -+ 0666); -+ if (IS_ERR(file)) { -+ if (!wbrtop) -+ mutex_unlock(&mtx); -+ if (!silent) -+ pr_err("open %s(%ld)\n", fpath, PTR_ERR(file)); -+ return file; -+ } -+ -+ /* keep file count */ -+ err = 0; -+ d = file->f_path.dentry; -+ h_parent = au_dget_parent_lock(d, AuLsc_I_PARENT); -+ if (!wbrtop) -+ mutex_unlock(&mtx); -+ /* mnt_want_write() is unnecessary here */ -+ h_dir = d_inode(h_parent); -+ inode = file_inode(file); -+ /* no delegation since it is just created */ -+ if (inode->i_nlink) -+ err = vfsub_unlink(h_dir, &file->f_path, /*delegated*/NULL, -+ /*force*/0); -+ inode_unlock(h_dir); -+ dput(h_parent); -+ if (unlikely(err)) { -+ if (!silent) -+ pr_err("unlink %s(%d)\n", fpath, err); -+ goto out; -+ } -+ -+ err = -EINVAL; -+ if (unlikely(sb == d->d_sb)) { -+ if (!silent) -+ pr_err("%s must be outside\n", fpath); -+ goto out; -+ } -+ if (unlikely(au_test_fs_bad_xino(d->d_sb))) { -+ if (!silent) -+ pr_err("xino doesn't support %s(%s)\n", -+ fpath, au_sbtype(d->d_sb)); -+ goto out; -+ } -+ return file; /* success */ -+ -+out: -+ fput(file); -+ file = ERR_PTR(err); -+ return file; -+} -+ -+/* -+ * create a new xinofile at the same place/path as @base. -+ */ -+struct file *au_xino_create2(struct super_block *sb, struct path *base, -+ struct file *copy_src) -+{ -+ struct file *file; -+ struct dentry *dentry, *parent; -+ struct inode *dir, *delegated; -+ struct qstr *name; -+ struct path path; -+ int err, do_unlock; -+ struct au_xino_lock_dir ldir; -+ -+ do_unlock = 1; -+ au_xino_lock_dir(sb, base, &ldir); -+ dentry = base->dentry; -+ parent = dentry->d_parent; /* dir inode is locked */ -+ dir = d_inode(parent); -+ IMustLock(dir); -+ -+ name = &dentry->d_name; -+ path.dentry = vfsub_lookup_one_len(name->name, parent, name->len); -+ if (IS_ERR(path.dentry)) { -+ file = (void *)path.dentry; -+ pr_err("%pd lookup err %ld\n", dentry, PTR_ERR(path.dentry)); -+ goto out; -+ } -+ -+ /* no need to mnt_want_write() since we call dentry_open() later */ -+ err = vfs_create(dir, path.dentry, 0666, NULL); -+ if (unlikely(err)) { -+ file = ERR_PTR(err); -+ pr_err("%pd create err %d\n", dentry, err); -+ goto out_dput; -+ } -+ -+ path.mnt = base->mnt; -+ file = vfsub_dentry_open(&path, -+ O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE -+ /* | __FMODE_NONOTIFY */); -+ if (IS_ERR(file)) { -+ pr_err("%pd open err %ld\n", dentry, PTR_ERR(file)); -+ goto out_dput; -+ } -+ -+ delegated = NULL; -+ err = vfsub_unlink(dir, &file->f_path, &delegated, /*force*/0); -+ au_xino_unlock_dir(&ldir); -+ do_unlock = 0; -+ if (unlikely(err == -EWOULDBLOCK)) { -+ pr_warn("cannot retry for NFSv4 delegation" -+ " for an internal unlink\n"); -+ iput(delegated); -+ } -+ if (unlikely(err)) { -+ pr_err("%pd unlink err %d\n", dentry, err); -+ goto out_fput; -+ } -+ -+ if (copy_src) { -+ /* no one can touch copy_src xino */ -+ err = au_copy_file(file, copy_src, vfsub_f_size_read(copy_src)); -+ if (unlikely(err)) { -+ pr_err("%pd copy err %d\n", dentry, err); -+ goto out_fput; -+ } -+ } -+ goto out_dput; /* success */ -+ -+out_fput: -+ fput(file); -+ file = ERR_PTR(err); -+out_dput: -+ dput(path.dentry); -+out: -+ if (do_unlock) -+ au_xino_unlock_dir(&ldir); -+ return file; -+} -+ -+struct file *au_xino_file1(struct au_xino *xi) -+{ -+ struct file *file; -+ unsigned int u, nfile; -+ -+ file = NULL; -+ nfile = xi->xi_nfile; -+ for (u = 0; u < nfile; u++) { -+ file = xi->xi_file[u]; -+ if (file) -+ break; -+ } -+ -+ return file; -+} -+ -+static int au_xino_file_set(struct au_xino *xi, int idx, struct file *file) -+{ -+ int err; -+ struct file *f; -+ void *p; -+ -+ if (file) -+ get_file(file); -+ -+ err = 0; -+ f = NULL; -+ if (idx < xi->xi_nfile) { -+ f = xi->xi_file[idx]; -+ if (f) -+ fput(f); -+ } else { -+ p = au_kzrealloc(xi->xi_file, -+ sizeof(*xi->xi_file) * xi->xi_nfile, -+ sizeof(*xi->xi_file) * (idx + 1), -+ GFP_NOFS, /*may_shrink*/0); -+ if (p) { -+ MtxMustLock(&xi->xi_mtx); -+ xi->xi_file = p; -+ xi->xi_nfile = idx + 1; -+ } else { -+ err = -ENOMEM; -+ if (file) -+ fput(file); -+ goto out; -+ } -+ } -+ xi->xi_file[idx] = file; -+ -+out: -+ return err; -+} -+ -+/* -+ * if @xinew->xi is not set, then create new xigen file. -+ */ -+struct file *au_xi_new(struct super_block *sb, struct au_xi_new *xinew) -+{ -+ struct file *file; -+ int err; -+ -+ SiMustAnyLock(sb); -+ -+ file = au_xino_create2(sb, xinew->base, xinew->copy_src); -+ if (IS_ERR(file)) { -+ err = PTR_ERR(file); -+ pr_err("%s[%d], err %d\n", -+ xinew->xi ? "xino" : "xigen", -+ xinew->idx, err); -+ goto out; -+ } -+ -+ if (xinew->xi) -+ err = au_xino_file_set(xinew->xi, xinew->idx, file); -+ else { -+ BUG(); -+ /* todo: make xigen file an array */ -+ /* err = au_xigen_file_set(sb, xinew->idx, file); */ -+ } -+ fput(file); -+ if (unlikely(err)) -+ file = ERR_PTR(err); -+ -+out: -+ return file; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * truncate xino files -+ */ -+static int au_xino_do_trunc(struct super_block *sb, aufs_bindex_t bindex, -+ int idx, struct kstatfs *st) -+{ -+ int err; -+ blkcnt_t blocks; -+ struct file *file, *new_xino; -+ struct au_xi_new xinew = { -+ .idx = idx -+ }; -+ -+ err = 0; -+ xinew.xi = au_sbr(sb, bindex)->br_xino; -+ file = au_xino_file(xinew.xi, idx); -+ if (!file) -+ goto out; -+ -+ xinew.base = &file->f_path; -+ err = vfs_statfs(xinew.base, st); -+ if (unlikely(err)) { -+ AuErr1("statfs err %d, ignored\n", err); -+ err = 0; -+ goto out; -+ } -+ -+ blocks = file_inode(file)->i_blocks; -+ pr_info("begin truncating xino(b%d-%d), ib%llu, %llu/%llu free blks\n", -+ bindex, idx, (u64)blocks, st->f_bfree, st->f_blocks); -+ -+ xinew.copy_src = file; -+ new_xino = au_xi_new(sb, &xinew); -+ if (IS_ERR(new_xino)) { -+ err = PTR_ERR(new_xino); -+ pr_err("xino(b%d-%d), err %d, ignored\n", bindex, idx, err); -+ goto out; -+ } -+ -+ err = vfs_statfs(&new_xino->f_path, st); -+ if (!err) -+ pr_info("end truncating xino(b%d-%d), ib%llu, %llu/%llu free blks\n", -+ bindex, idx, (u64)file_inode(new_xino)->i_blocks, -+ st->f_bfree, st->f_blocks); -+ else { -+ AuErr1("statfs err %d, ignored\n", err); -+ err = 0; -+ } -+ -+out: -+ return err; -+} -+ -+int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex, int idx_begin) -+{ -+ int err, i; -+ unsigned long jiffy; -+ aufs_bindex_t bbot; -+ struct kstatfs *st; -+ struct au_branch *br; -+ struct au_xino *xi; -+ -+ err = -ENOMEM; -+ st = kmalloc(sizeof(*st), GFP_NOFS); -+ if (unlikely(!st)) -+ goto out; -+ -+ err = -EINVAL; -+ bbot = au_sbbot(sb); -+ if (unlikely(bindex < 0 || bbot < bindex)) -+ goto out_st; -+ -+ err = 0; -+ jiffy = jiffies; -+ br = au_sbr(sb, bindex); -+ xi = br->br_xino; -+ for (i = idx_begin; !err && i < xi->xi_nfile; i++) -+ err = au_xino_do_trunc(sb, bindex, i, st); -+ if (!err) -+ au_sbi(sb)->si_xino_jiffy = jiffy; -+ -+out_st: -+ au_kfree_rcu(st); -+out: -+ return err; -+} -+ -+struct xino_do_trunc_args { -+ struct super_block *sb; -+ struct au_branch *br; -+ int idx; -+}; -+ -+static void xino_do_trunc(void *_args) -+{ -+ struct xino_do_trunc_args *args = _args; -+ struct super_block *sb; -+ struct au_branch *br; -+ struct inode *dir; -+ int err, idx; -+ aufs_bindex_t bindex; -+ -+ err = 0; -+ sb = args->sb; -+ dir = d_inode(sb->s_root); -+ br = args->br; -+ idx = args->idx; -+ -+ si_noflush_write_lock(sb); -+ ii_read_lock_parent(dir); -+ bindex = au_br_index(sb, br->br_id); -+ err = au_xino_trunc(sb, bindex, idx); -+ ii_read_unlock(dir); -+ if (unlikely(err)) -+ pr_warn("err b%d, (%d)\n", bindex, err); -+ atomic_dec(&br->br_xino->xi_truncating); -+ au_lcnt_dec(&br->br_count); -+ si_write_unlock(sb); -+ au_nwt_done(&au_sbi(sb)->si_nowait); -+ au_kfree_rcu(args); -+} -+ -+/* -+ * returns the index in the xi_file array whose corresponding file is necessary -+ * to truncate, or -1 which means no need to truncate. -+ */ -+static int xino_trunc_test(struct super_block *sb, struct au_branch *br) -+{ -+ int err; -+ unsigned int u; -+ struct kstatfs st; -+ struct au_sbinfo *sbinfo; -+ struct au_xino *xi; -+ struct file *file; -+ -+ /* todo: si_xino_expire and the ratio should be customizable */ -+ sbinfo = au_sbi(sb); -+ if (time_before(jiffies, -+ sbinfo->si_xino_jiffy + sbinfo->si_xino_expire)) -+ return -1; -+ -+ /* truncation border */ -+ xi = br->br_xino; -+ for (u = 0; u < xi->xi_nfile; u++) { -+ file = au_xino_file(xi, u); -+ if (!file) -+ continue; -+ -+ err = vfs_statfs(&file->f_path, &st); -+ if (unlikely(err)) { -+ AuErr1("statfs err %d, ignored\n", err); -+ return -1; -+ } -+ if (div64_u64(st.f_bfree * 100, st.f_blocks) -+ >= AUFS_XINO_DEF_TRUNC) -+ return u; -+ } -+ -+ return -1; -+} -+ -+static void xino_try_trunc(struct super_block *sb, struct au_branch *br) -+{ -+ int idx; -+ struct xino_do_trunc_args *args; -+ int wkq_err; -+ -+ idx = xino_trunc_test(sb, br); -+ if (idx < 0) -+ return; -+ -+ if (atomic_inc_return(&br->br_xino->xi_truncating) > 1) -+ goto out; -+ -+ /* lock and kfree() will be called in trunc_xino() */ -+ args = kmalloc(sizeof(*args), GFP_NOFS); -+ if (unlikely(!args)) { -+ AuErr1("no memory\n"); -+ goto out; -+ } -+ -+ au_lcnt_inc(&br->br_count); -+ args->sb = sb; -+ args->br = br; -+ args->idx = idx; -+ wkq_err = au_wkq_nowait(xino_do_trunc, args, sb, /*flags*/0); -+ if (!wkq_err) -+ return; /* success */ -+ -+ pr_err("wkq %d\n", wkq_err); -+ au_lcnt_dec(&br->br_count); -+ au_kfree_rcu(args); -+ -+out: -+ atomic_dec(&br->br_xino->xi_truncating); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct au_xi_calc { -+ int idx; -+ loff_t pos; -+}; -+ -+static void au_xi_calc(struct super_block *sb, ino_t h_ino, -+ struct au_xi_calc *calc) -+{ -+ loff_t maxent; -+ -+ maxent = au_xi_maxent(sb); -+ calc->idx = div64_u64_rem(h_ino, maxent, &calc->pos); -+ calc->pos *= sizeof(ino_t); -+} -+ -+static int au_xino_do_new_async(struct super_block *sb, struct au_branch *br, -+ struct au_xi_calc *calc) -+{ -+ int err; -+ struct file *file; -+ struct au_xino *xi = br->br_xino; -+ struct au_xi_new xinew = { -+ .xi = xi -+ }; -+ -+ SiMustAnyLock(sb); -+ -+ err = 0; -+ if (!xi) -+ goto out; -+ -+ mutex_lock(&xi->xi_mtx); -+ file = au_xino_file(xi, calc->idx); -+ if (file) -+ goto out_mtx; -+ -+ file = au_xino_file(xi, /*idx*/-1); -+ AuDebugOn(!file); -+ xinew.idx = calc->idx; -+ xinew.base = &file->f_path; -+ /* xinew.copy_src = NULL; */ -+ file = au_xi_new(sb, &xinew); -+ if (IS_ERR(file)) -+ err = PTR_ERR(file); -+ -+out_mtx: -+ mutex_unlock(&xi->xi_mtx); -+out: -+ return err; -+} -+ -+struct au_xino_do_new_async_args { -+ struct super_block *sb; -+ struct au_branch *br; -+ struct au_xi_calc calc; -+ ino_t ino; -+}; -+ -+struct au_xi_writing { -+ struct hlist_bl_node node; -+ ino_t h_ino, ino; -+}; -+ -+static int au_xino_do_write(vfs_writef_t write, struct file *file, -+ struct au_xi_calc *calc, ino_t ino); -+ -+static void au_xino_call_do_new_async(void *args) -+{ -+ struct au_xino_do_new_async_args *a = args; -+ struct au_branch *br; -+ struct super_block *sb; -+ struct au_sbinfo *sbi; -+ struct inode *root; -+ struct file *file; -+ struct au_xi_writing *del, *p; -+ struct hlist_bl_head *hbl; -+ struct hlist_bl_node *pos; -+ int err; -+ -+ br = a->br; -+ sb = a->sb; -+ sbi = au_sbi(sb); -+ si_noflush_read_lock(sb); -+ root = d_inode(sb->s_root); -+ ii_read_lock_child(root); -+ err = au_xino_do_new_async(sb, br, &a->calc); -+ if (unlikely(err)) { -+ AuIOErr("err %d\n", err); -+ goto out; -+ } -+ -+ file = au_xino_file(br->br_xino, a->calc.idx); -+ AuDebugOn(!file); -+ err = au_xino_do_write(sbi->si_xwrite, file, &a->calc, a->ino); -+ if (unlikely(err)) { -+ AuIOErr("err %d\n", err); -+ goto out; -+ } -+ -+ del = NULL; -+ hbl = &br->br_xino->xi_writing; -+ hlist_bl_lock(hbl); -+ au_hbl_for_each(pos, hbl) { -+ p = container_of(pos, struct au_xi_writing, node); -+ if (p->ino == a->ino) { -+ del = p; -+ hlist_bl_del(&p->node); -+ break; -+ } -+ } -+ hlist_bl_unlock(hbl); -+ au_kfree_rcu(del); -+ -+out: -+ au_lcnt_dec(&br->br_count); -+ ii_read_unlock(root); -+ si_read_unlock(sb); -+ au_nwt_done(&sbi->si_nowait); -+ au_kfree_rcu(a); -+} -+ -+/* -+ * create a new xino file asynchronously -+ */ -+static int au_xino_new_async(struct super_block *sb, struct au_branch *br, -+ struct au_xi_calc *calc, ino_t ino) -+{ -+ int err; -+ struct au_xino_do_new_async_args *arg; -+ -+ err = -ENOMEM; -+ arg = kmalloc(sizeof(*arg), GFP_NOFS); -+ if (unlikely(!arg)) -+ goto out; -+ -+ arg->sb = sb; -+ arg->br = br; -+ arg->calc = *calc; -+ arg->ino = ino; -+ au_lcnt_inc(&br->br_count); -+ err = au_wkq_nowait(au_xino_call_do_new_async, arg, sb, AuWkq_NEST); -+ if (unlikely(err)) { -+ pr_err("wkq %d\n", err); -+ au_lcnt_dec(&br->br_count); -+ au_kfree_rcu(arg); -+ } -+ -+out: -+ return err; -+} -+ -+/* -+ * read @ino from xinofile for the specified branch{@sb, @bindex} -+ * at the position of @h_ino. -+ */ -+int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, -+ ino_t *ino) -+{ -+ int err; -+ ssize_t sz; -+ struct au_xi_calc calc; -+ struct au_sbinfo *sbinfo; -+ struct file *file; -+ struct au_xino *xi; -+ struct hlist_bl_head *hbl; -+ struct hlist_bl_node *pos; -+ struct au_xi_writing *p; -+ -+ *ino = 0; -+ if (!au_opt_test(au_mntflags(sb), XINO)) -+ return 0; /* no xino */ -+ -+ err = 0; -+ au_xi_calc(sb, h_ino, &calc); -+ xi = au_sbr(sb, bindex)->br_xino; -+ file = au_xino_file(xi, calc.idx); -+ if (!file) { -+ hbl = &xi->xi_writing; -+ hlist_bl_lock(hbl); -+ au_hbl_for_each(pos, hbl) { -+ p = container_of(pos, struct au_xi_writing, node); -+ if (p->h_ino == h_ino) { -+ AuDbg("hi%llu, i%llu, found\n", -+ (u64)p->h_ino, (u64)p->ino); -+ *ino = p->ino; -+ break; -+ } -+ } -+ hlist_bl_unlock(hbl); -+ return 0; -+ } else if (vfsub_f_size_read(file) < calc.pos + sizeof(*ino)) -+ return 0; /* no xino */ -+ -+ sbinfo = au_sbi(sb); -+ sz = xino_fread(sbinfo->si_xread, file, ino, sizeof(*ino), &calc.pos); -+ if (sz == sizeof(*ino)) -+ return 0; /* success */ -+ -+ err = sz; -+ if (unlikely(sz >= 0)) { -+ err = -EIO; -+ AuIOErr("xino read error (%zd)\n", sz); -+ } -+ return err; -+} -+ -+static int au_xino_do_write(vfs_writef_t write, struct file *file, -+ struct au_xi_calc *calc, ino_t ino) -+{ -+ ssize_t sz; -+ -+ sz = xino_fwrite(write, file, &ino, sizeof(ino), &calc->pos); -+ if (sz == sizeof(ino)) -+ return 0; /* success */ -+ -+ AuIOErr("write failed (%zd)\n", sz); -+ return -EIO; -+} -+ -+/* -+ * write @ino to the xinofile for the specified branch{@sb, @bindex} -+ * at the position of @h_ino. -+ * even if @ino is zero, it is written to the xinofile and means no entry. -+ * if the size of the xino file on a specific filesystem exceeds the watermark, -+ * try truncating it. -+ */ -+int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, -+ ino_t ino) -+{ -+ int err; -+ unsigned int mnt_flags; -+ struct au_xi_calc calc; -+ struct file *file; -+ struct au_branch *br; -+ struct au_xino *xi; -+ struct au_xi_writing *p; -+ -+ SiMustAnyLock(sb); -+ -+ mnt_flags = au_mntflags(sb); -+ if (!au_opt_test(mnt_flags, XINO)) -+ return 0; -+ -+ au_xi_calc(sb, h_ino, &calc); -+ br = au_sbr(sb, bindex); -+ xi = br->br_xino; -+ file = au_xino_file(xi, calc.idx); -+ if (!file) { -+ /* store the inum pair into the list */ -+ p = kmalloc(sizeof(*p), GFP_NOFS | __GFP_NOFAIL); -+ p->h_ino = h_ino; -+ p->ino = ino; -+ au_hbl_add(&p->node, &xi->xi_writing); -+ -+ /* create and write a new xino file asynchronously */ -+ err = au_xino_new_async(sb, br, &calc, ino); -+ if (!err) -+ return 0; /* success */ -+ goto out; -+ } -+ -+ err = au_xino_do_write(au_sbi(sb)->si_xwrite, file, &calc, ino); -+ if (!err) { -+ br = au_sbr(sb, bindex); -+ if (au_opt_test(mnt_flags, TRUNC_XINO) -+ && au_test_fs_trunc_xino(au_br_sb(br))) -+ xino_try_trunc(sb, br); -+ return 0; /* success */ -+ } -+ -+out: -+ AuIOErr("write failed (%d)\n", err); -+ return -EIO; -+} -+ -+static ssize_t xino_fread_wkq(vfs_readf_t func, struct file *file, void *buf, -+ size_t size, loff_t *pos); -+ -+/* todo: unnecessary to support mmap_sem since kernel-space? */ -+ssize_t xino_fread(vfs_readf_t func, struct file *file, void *kbuf, size_t size, -+ loff_t *pos) -+{ -+ ssize_t err; -+ mm_segment_t oldfs; -+ union { -+ void *k; -+ char __user *u; -+ } buf; -+ int i; -+ const int prevent_endless = 10; -+ -+ i = 0; -+ buf.k = kbuf; -+ oldfs = get_fs(); -+ set_fs(KERNEL_DS); -+ do { -+ err = func(file, buf.u, size, pos); -+ if (err == -EINTR -+ && !au_wkq_test() -+ && fatal_signal_pending(current)) { -+ set_fs(oldfs); -+ err = xino_fread_wkq(func, file, kbuf, size, pos); -+ BUG_ON(err == -EINTR); -+ oldfs = get_fs(); -+ set_fs(KERNEL_DS); -+ } -+ } while (i++ < prevent_endless -+ && (err == -EAGAIN || err == -EINTR)); -+ set_fs(oldfs); -+ -+#if 0 /* reserved for future use */ -+ if (err > 0) -+ fsnotify_access(file->f_path.dentry); -+#endif -+ -+ return err; -+} -+ -+struct xino_fread_args { -+ ssize_t *errp; -+ vfs_readf_t func; -+ struct file *file; -+ void *buf; -+ size_t size; -+ loff_t *pos; -+}; -+ -+static void call_xino_fread(void *args) -+{ -+ struct xino_fread_args *a = args; -+ *a->errp = xino_fread(a->func, a->file, a->buf, a->size, a->pos); -+} -+ -+static ssize_t xino_fread_wkq(vfs_readf_t func, struct file *file, void *buf, -+ size_t size, loff_t *pos) -+{ -+ ssize_t err; -+ int wkq_err; -+ struct xino_fread_args args = { -+ .errp = &err, -+ .func = func, -+ .file = file, -+ .buf = buf, -+ .size = size, -+ .pos = pos -+ }; -+ -+ wkq_err = au_wkq_wait(call_xino_fread, &args); -+ if (unlikely(wkq_err)) -+ err = wkq_err; -+ -+ return err; -+} -+ -+static ssize_t xino_fwrite_wkq(vfs_writef_t func, struct file *file, void *buf, -+ size_t size, loff_t *pos); -+ -+static ssize_t do_xino_fwrite(vfs_writef_t func, struct file *file, void *kbuf, -+ size_t size, loff_t *pos) -+{ -+ ssize_t err; -+ mm_segment_t oldfs; -+ union { -+ void *k; -+ const char __user *u; -+ } buf; -+ int i; -+ const int prevent_endless = 10; -+ -+ i = 0; -+ buf.k = kbuf; -+ oldfs = get_fs(); -+ set_fs(KERNEL_DS); -+ do { -+ err = func(file, buf.u, size, pos); -+ if (err == -EINTR -+ && !au_wkq_test() -+ && fatal_signal_pending(current)) { -+ set_fs(oldfs); -+ err = xino_fwrite_wkq(func, file, kbuf, size, pos); -+ BUG_ON(err == -EINTR); -+ oldfs = get_fs(); -+ set_fs(KERNEL_DS); -+ } -+ } while (i++ < prevent_endless -+ && (err == -EAGAIN || err == -EINTR)); -+ set_fs(oldfs); -+ -+#if 0 /* reserved for future use */ -+ if (err > 0) -+ fsnotify_modify(file->f_path.dentry); -+#endif -+ -+ return err; -+} -+ -+struct do_xino_fwrite_args { -+ ssize_t *errp; -+ vfs_writef_t func; -+ struct file *file; -+ void *buf; -+ size_t size; -+ loff_t *pos; -+}; -+ -+static void call_do_xino_fwrite(void *args) -+{ -+ struct do_xino_fwrite_args *a = args; -+ *a->errp = do_xino_fwrite(a->func, a->file, a->buf, a->size, a->pos); -+} -+ -+static ssize_t xino_fwrite_wkq(vfs_writef_t func, struct file *file, void *buf, -+ size_t size, loff_t *pos) -+{ -+ ssize_t err; -+ int wkq_err; -+ struct do_xino_fwrite_args args = { -+ .errp = &err, -+ .func = func, -+ .file = file, -+ .buf = buf, -+ .size = size, -+ .pos = pos -+ }; -+ -+ /* -+ * it breaks RLIMIT_FSIZE and normal user's limit, -+ * users should care about quota and real 'filesystem full.' -+ */ -+ wkq_err = au_wkq_wait(call_do_xino_fwrite, &args); -+ if (unlikely(wkq_err)) -+ err = wkq_err; -+ -+ return err; -+} -+ -+ssize_t xino_fwrite(vfs_writef_t func, struct file *file, void *buf, -+ size_t size, loff_t *pos) -+{ -+ ssize_t err; -+ -+ if (rlimit(RLIMIT_FSIZE) == RLIM_INFINITY) { -+ lockdep_off(); -+ err = do_xino_fwrite(func, file, buf, size, pos); -+ lockdep_on(); -+ } else { -+ lockdep_off(); -+ err = xino_fwrite_wkq(func, file, buf, size, pos); -+ lockdep_on(); -+ } -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * inode number bitmap -+ */ -+static const int page_bits = (int)PAGE_SIZE * BITS_PER_BYTE; -+static ino_t xib_calc_ino(unsigned long pindex, int bit) -+{ -+ ino_t ino; -+ -+ AuDebugOn(bit < 0 || page_bits <= bit); -+ ino = AUFS_FIRST_INO + pindex * page_bits + bit; -+ return ino; -+} -+ -+static void xib_calc_bit(ino_t ino, unsigned long *pindex, int *bit) -+{ -+ AuDebugOn(ino < AUFS_FIRST_INO); -+ ino -= AUFS_FIRST_INO; -+ *pindex = ino / page_bits; -+ *bit = ino % page_bits; -+} -+ -+static int xib_pindex(struct super_block *sb, unsigned long pindex) -+{ -+ int err; -+ loff_t pos; -+ ssize_t sz; -+ struct au_sbinfo *sbinfo; -+ struct file *xib; -+ unsigned long *p; -+ -+ sbinfo = au_sbi(sb); -+ MtxMustLock(&sbinfo->si_xib_mtx); -+ AuDebugOn(pindex > ULONG_MAX / PAGE_SIZE -+ || !au_opt_test(sbinfo->si_mntflags, XINO)); -+ -+ if (pindex == sbinfo->si_xib_last_pindex) -+ return 0; -+ -+ xib = sbinfo->si_xib; -+ p = sbinfo->si_xib_buf; -+ pos = sbinfo->si_xib_last_pindex; -+ pos *= PAGE_SIZE; -+ sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos); -+ if (unlikely(sz != PAGE_SIZE)) -+ goto out; -+ -+ pos = pindex; -+ pos *= PAGE_SIZE; -+ if (vfsub_f_size_read(xib) >= pos + PAGE_SIZE) -+ sz = xino_fread(sbinfo->si_xread, xib, p, PAGE_SIZE, &pos); -+ else { -+ memset(p, 0, PAGE_SIZE); -+ sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos); -+ } -+ if (sz == PAGE_SIZE) { -+ sbinfo->si_xib_last_pindex = pindex; -+ return 0; /* success */ -+ } -+ -+out: -+ AuIOErr1("write failed (%zd)\n", sz); -+ err = sz; -+ if (sz >= 0) -+ err = -EIO; -+ return err; -+} -+ -+static void au_xib_clear_bit(struct inode *inode) -+{ -+ int err, bit; -+ unsigned long pindex; -+ struct super_block *sb; -+ struct au_sbinfo *sbinfo; -+ -+ AuDebugOn(inode->i_nlink); -+ -+ sb = inode->i_sb; -+ xib_calc_bit(inode->i_ino, &pindex, &bit); -+ AuDebugOn(page_bits <= bit); -+ sbinfo = au_sbi(sb); -+ mutex_lock(&sbinfo->si_xib_mtx); -+ err = xib_pindex(sb, pindex); -+ if (!err) { -+ clear_bit(bit, sbinfo->si_xib_buf); -+ sbinfo->si_xib_next_bit = bit; -+ } -+ mutex_unlock(&sbinfo->si_xib_mtx); -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * truncate a xino bitmap file -+ */ -+ -+/* todo: slow */ -+static int do_xib_restore(struct super_block *sb, struct file *file, void *page) -+{ -+ int err, bit; -+ ssize_t sz; -+ unsigned long pindex; -+ loff_t pos, pend; -+ struct au_sbinfo *sbinfo; -+ vfs_readf_t func; -+ ino_t *ino; -+ unsigned long *p; -+ -+ err = 0; -+ sbinfo = au_sbi(sb); -+ MtxMustLock(&sbinfo->si_xib_mtx); -+ p = sbinfo->si_xib_buf; -+ func = sbinfo->si_xread; -+ pend = vfsub_f_size_read(file); -+ pos = 0; -+ while (pos < pend) { -+ sz = xino_fread(func, file, page, PAGE_SIZE, &pos); -+ err = sz; -+ if (unlikely(sz <= 0)) -+ goto out; -+ -+ err = 0; -+ for (ino = page; sz > 0; ino++, sz -= sizeof(ino)) { -+ if (unlikely(*ino < AUFS_FIRST_INO)) -+ continue; -+ -+ xib_calc_bit(*ino, &pindex, &bit); -+ AuDebugOn(page_bits <= bit); -+ err = xib_pindex(sb, pindex); -+ if (!err) -+ set_bit(bit, p); -+ else -+ goto out; -+ } -+ } -+ -+out: -+ return err; -+} -+ -+static int xib_restore(struct super_block *sb) -+{ -+ int err, i; -+ unsigned int nfile; -+ aufs_bindex_t bindex, bbot; -+ void *page; -+ struct au_branch *br; -+ struct au_xino *xi; -+ struct file *file; -+ -+ err = -ENOMEM; -+ page = (void *)__get_free_page(GFP_NOFS); -+ if (unlikely(!page)) -+ goto out; -+ -+ err = 0; -+ bbot = au_sbbot(sb); -+ for (bindex = 0; !err && bindex <= bbot; bindex++) -+ if (!bindex || is_sb_shared(sb, bindex, bindex - 1) < 0) { -+ br = au_sbr(sb, bindex); -+ xi = br->br_xino; -+ nfile = xi->xi_nfile; -+ for (i = 0; i < nfile; i++) { -+ file = au_xino_file(xi, i); -+ if (file) -+ err = do_xib_restore(sb, file, page); -+ } -+ } else -+ AuDbg("skip shared b%d\n", bindex); -+ free_page((unsigned long)page); -+ -+out: -+ return err; -+} -+ -+int au_xib_trunc(struct super_block *sb) -+{ -+ int err; -+ ssize_t sz; -+ loff_t pos; -+ struct au_sbinfo *sbinfo; -+ unsigned long *p; -+ struct file *file; -+ -+ SiMustWriteLock(sb); -+ -+ err = 0; -+ sbinfo = au_sbi(sb); -+ if (!au_opt_test(sbinfo->si_mntflags, XINO)) -+ goto out; -+ -+ file = sbinfo->si_xib; -+ if (vfsub_f_size_read(file) <= PAGE_SIZE) -+ goto out; -+ -+ file = au_xino_create2(sb, &sbinfo->si_xib->f_path, NULL); -+ err = PTR_ERR(file); -+ if (IS_ERR(file)) -+ goto out; -+ fput(sbinfo->si_xib); -+ sbinfo->si_xib = file; -+ -+ p = sbinfo->si_xib_buf; -+ memset(p, 0, PAGE_SIZE); -+ pos = 0; -+ sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xib, p, PAGE_SIZE, &pos); -+ if (unlikely(sz != PAGE_SIZE)) { -+ err = sz; -+ AuIOErr("err %d\n", err); -+ if (sz >= 0) -+ err = -EIO; -+ goto out; -+ } -+ -+ mutex_lock(&sbinfo->si_xib_mtx); -+ /* mnt_want_write() is unnecessary here */ -+ err = xib_restore(sb); -+ mutex_unlock(&sbinfo->si_xib_mtx); -+ -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct au_xino *au_xino_alloc(unsigned int nfile) -+{ -+ struct au_xino *xi; -+ -+ xi = kzalloc(sizeof(*xi), GFP_NOFS); -+ if (unlikely(!xi)) -+ goto out; -+ xi->xi_nfile = nfile; -+ xi->xi_file = kcalloc(nfile, sizeof(*xi->xi_file), GFP_NOFS); -+ if (unlikely(!xi->xi_file)) -+ goto out_free; -+ -+ xi->xi_nondir.total = 8; /* initial size */ -+ xi->xi_nondir.array = kcalloc(xi->xi_nondir.total, sizeof(ino_t), -+ GFP_NOFS); -+ if (unlikely(!xi->xi_nondir.array)) -+ goto out_file; -+ -+ spin_lock_init(&xi->xi_nondir.spin); -+ init_waitqueue_head(&xi->xi_nondir.wqh); -+ mutex_init(&xi->xi_mtx); -+ INIT_HLIST_BL_HEAD(&xi->xi_writing); -+ atomic_set(&xi->xi_truncating, 0); -+ kref_init(&xi->xi_kref); -+ goto out; /* success */ -+ -+out_file: -+ au_kfree_try_rcu(xi->xi_file); -+out_free: -+ au_kfree_rcu(xi); -+ xi = NULL; -+out: -+ return xi; -+} -+ -+static int au_xino_init(struct au_branch *br, int idx, struct file *file) -+{ -+ int err; -+ struct au_xino *xi; -+ -+ err = 0; -+ xi = au_xino_alloc(idx + 1); -+ if (unlikely(!xi)) { -+ err = -ENOMEM; -+ goto out; -+ } -+ -+ if (file) -+ get_file(file); -+ xi->xi_file[idx] = file; -+ AuDebugOn(br->br_xino); -+ br->br_xino = xi; -+ -+out: -+ return err; -+} -+ -+static void au_xino_release(struct kref *kref) -+{ -+ struct au_xino *xi; -+ int i; -+ unsigned long ul; -+ struct hlist_bl_head *hbl; -+ struct hlist_bl_node *pos, *n; -+ struct au_xi_writing *p; -+ -+ xi = container_of(kref, struct au_xino, xi_kref); -+ for (i = 0; i < xi->xi_nfile; i++) -+ if (xi->xi_file[i]) -+ fput(xi->xi_file[i]); -+ for (i = xi->xi_nondir.total - 1; i >= 0; i--) -+ AuDebugOn(xi->xi_nondir.array[i]); -+ mutex_destroy(&xi->xi_mtx); -+ hbl = &xi->xi_writing; -+ ul = au_hbl_count(hbl); -+ if (unlikely(ul)) { -+ pr_warn("xi_writing %lu\n", ul); -+ hlist_bl_lock(hbl); -+ hlist_bl_for_each_entry_safe (p, pos, n, hbl, node) { -+ hlist_bl_del(&p->node); -+ au_kfree_rcu(p); -+ } -+ hlist_bl_unlock(hbl); -+ } -+ au_kfree_try_rcu(xi->xi_file); -+ au_kfree_try_rcu(xi->xi_nondir.array); -+ au_kfree_rcu(xi); -+} -+ -+int au_xino_put(struct au_branch *br) -+{ -+ int ret; -+ struct au_xino *xi; -+ -+ ret = 0; -+ xi = br->br_xino; -+ if (xi) { -+ br->br_xino = NULL; -+ ret = kref_put(&xi->xi_kref, au_xino_release); -+ } -+ -+ return ret; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * xino mount option handlers -+ */ -+ -+/* xino bitmap */ -+static void xino_clear_xib(struct super_block *sb) -+{ -+ struct au_sbinfo *sbinfo; -+ -+ SiMustWriteLock(sb); -+ -+ sbinfo = au_sbi(sb); -+ /* unnecessary to clear sbinfo->si_xread and ->si_xwrite */ -+ if (sbinfo->si_xib) -+ fput(sbinfo->si_xib); -+ sbinfo->si_xib = NULL; -+ if (sbinfo->si_xib_buf) -+ free_page((unsigned long)sbinfo->si_xib_buf); -+ sbinfo->si_xib_buf = NULL; -+} -+ -+static int au_xino_set_xib(struct super_block *sb, struct path *path) -+{ -+ int err; -+ loff_t pos; -+ struct au_sbinfo *sbinfo; -+ struct file *file; -+ struct super_block *xi_sb; -+ -+ SiMustWriteLock(sb); -+ -+ sbinfo = au_sbi(sb); -+ file = au_xino_create2(sb, path, sbinfo->si_xib); -+ err = PTR_ERR(file); -+ if (IS_ERR(file)) -+ goto out; -+ if (sbinfo->si_xib) -+ fput(sbinfo->si_xib); -+ sbinfo->si_xib = file; -+ sbinfo->si_xread = vfs_readf(file); -+ sbinfo->si_xwrite = vfs_writef(file); -+ xi_sb = file_inode(file)->i_sb; -+ sbinfo->si_ximaxent = xi_sb->s_maxbytes; -+ if (unlikely(sbinfo->si_ximaxent < PAGE_SIZE)) { -+ err = -EIO; -+ pr_err("s_maxbytes(%llu) on %s is too small\n", -+ (u64)sbinfo->si_ximaxent, au_sbtype(xi_sb)); -+ goto out_unset; -+ } -+ sbinfo->si_ximaxent /= sizeof(ino_t); -+ -+ err = -ENOMEM; -+ if (!sbinfo->si_xib_buf) -+ sbinfo->si_xib_buf = (void *)get_zeroed_page(GFP_NOFS); -+ if (unlikely(!sbinfo->si_xib_buf)) -+ goto out_unset; -+ -+ sbinfo->si_xib_last_pindex = 0; -+ sbinfo->si_xib_next_bit = 0; -+ if (vfsub_f_size_read(file) < PAGE_SIZE) { -+ pos = 0; -+ err = xino_fwrite(sbinfo->si_xwrite, file, sbinfo->si_xib_buf, -+ PAGE_SIZE, &pos); -+ if (unlikely(err != PAGE_SIZE)) -+ goto out_free; -+ } -+ err = 0; -+ goto out; /* success */ -+ -+out_free: -+ if (sbinfo->si_xib_buf) -+ free_page((unsigned long)sbinfo->si_xib_buf); -+ sbinfo->si_xib_buf = NULL; -+ if (err >= 0) -+ err = -EIO; -+out_unset: -+ fput(sbinfo->si_xib); -+ sbinfo->si_xib = NULL; -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+/* xino for each branch */ -+static void xino_clear_br(struct super_block *sb) -+{ -+ aufs_bindex_t bindex, bbot; -+ struct au_branch *br; -+ -+ bbot = au_sbbot(sb); -+ for (bindex = 0; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ AuDebugOn(!br); -+ au_xino_put(br); -+ } -+} -+ -+static void au_xino_set_br_shared(struct super_block *sb, struct au_branch *br, -+ aufs_bindex_t bshared) -+{ -+ struct au_branch *brshared; -+ -+ brshared = au_sbr(sb, bshared); -+ AuDebugOn(!brshared->br_xino); -+ AuDebugOn(!brshared->br_xino->xi_file); -+ if (br->br_xino != brshared->br_xino) { -+ au_xino_get(brshared); -+ au_xino_put(br); -+ br->br_xino = brshared->br_xino; -+ } -+} -+ -+struct au_xino_do_set_br { -+ vfs_writef_t writef; -+ struct au_branch *br; -+ ino_t h_ino; -+ aufs_bindex_t bshared; -+}; -+ -+static int au_xino_do_set_br(struct super_block *sb, struct path *path, -+ struct au_xino_do_set_br *args) -+{ -+ int err; -+ struct au_xi_calc calc; -+ struct file *file; -+ struct au_branch *br; -+ struct au_xi_new xinew = { -+ .base = path -+ }; -+ -+ br = args->br; -+ xinew.xi = br->br_xino; -+ au_xi_calc(sb, args->h_ino, &calc); -+ xinew.copy_src = au_xino_file(xinew.xi, calc.idx); -+ if (args->bshared >= 0) -+ /* shared xino */ -+ au_xino_set_br_shared(sb, br, args->bshared); -+ else if (!xinew.xi) { -+ /* new xino */ -+ err = au_xino_init(br, calc.idx, xinew.copy_src); -+ if (unlikely(err)) -+ goto out; -+ } -+ -+ /* force re-creating */ -+ xinew.xi = br->br_xino; -+ xinew.idx = calc.idx; -+ mutex_lock(&xinew.xi->xi_mtx); -+ file = au_xi_new(sb, &xinew); -+ mutex_unlock(&xinew.xi->xi_mtx); -+ err = PTR_ERR(file); -+ if (IS_ERR(file)) -+ goto out; -+ AuDebugOn(!file); -+ -+ err = au_xino_do_write(args->writef, file, &calc, AUFS_ROOT_INO); -+ if (unlikely(err)) -+ au_xino_put(br); -+ -+out: -+ AuTraceErr(err); -+ return err; -+} -+ -+static int au_xino_set_br(struct super_block *sb, struct path *path) -+{ -+ int err; -+ aufs_bindex_t bindex, bbot; -+ struct au_xino_do_set_br args; -+ struct inode *inode; -+ -+ SiMustWriteLock(sb); -+ -+ bbot = au_sbbot(sb); -+ inode = d_inode(sb->s_root); -+ args.writef = au_sbi(sb)->si_xwrite; -+ for (bindex = 0; bindex <= bbot; bindex++) { -+ args.h_ino = au_h_iptr(inode, bindex)->i_ino; -+ args.br = au_sbr(sb, bindex); -+ args.bshared = is_sb_shared(sb, bindex, bindex - 1); -+ err = au_xino_do_set_br(sb, path, &args); -+ if (unlikely(err)) -+ break; -+ } -+ -+ AuTraceErr(err); -+ return err; -+} -+ -+void au_xino_clr(struct super_block *sb) -+{ -+ struct au_sbinfo *sbinfo; -+ -+ au_xigen_clr(sb); -+ xino_clear_xib(sb); -+ xino_clear_br(sb); -+ dbgaufs_brs_del(sb, 0); -+ sbinfo = au_sbi(sb); -+ /* lvalue, do not call au_mntflags() */ -+ au_opt_clr(sbinfo->si_mntflags, XINO); -+} -+ -+int au_xino_set(struct super_block *sb, struct au_opt_xino *xiopt, int remount) -+{ -+ int err, skip; -+ struct dentry *dentry, *parent, *cur_dentry, *cur_parent; -+ struct qstr *dname, *cur_name; -+ struct file *cur_xino; -+ struct au_sbinfo *sbinfo; -+ struct path *path, *cur_path; -+ -+ SiMustWriteLock(sb); -+ -+ err = 0; -+ sbinfo = au_sbi(sb); -+ path = &xiopt->file->f_path; -+ dentry = path->dentry; -+ parent = dget_parent(dentry); -+ if (remount) { -+ skip = 0; -+ cur_xino = sbinfo->si_xib; -+ if (cur_xino) { -+ cur_path = &cur_xino->f_path; -+ cur_dentry = cur_path->dentry; -+ cur_parent = dget_parent(cur_dentry); -+ cur_name = &cur_dentry->d_name; -+ dname = &dentry->d_name; -+ skip = (cur_parent == parent -+ && au_qstreq(dname, cur_name)); -+ dput(cur_parent); -+ } -+ if (skip) -+ goto out; -+ } -+ -+ au_opt_set(sbinfo->si_mntflags, XINO); -+ err = au_xino_set_xib(sb, path); -+ /* si_x{read,write} are set */ -+ if (!err) -+ err = au_xigen_set(sb, path); -+ if (!err) -+ err = au_xino_set_br(sb, path); -+ if (!err) { -+ dbgaufs_brs_add(sb, 0, /*topdown*/1); -+ goto out; /* success */ -+ } -+ -+ /* reset all */ -+ AuIOErr("failed setting xino(%d).\n", err); -+ au_xino_clr(sb); -+ -+out: -+ dput(parent); -+ return err; -+} -+ -+/* -+ * create a xinofile at the default place/path. -+ */ -+struct file *au_xino_def(struct super_block *sb) -+{ -+ struct file *file; -+ char *page, *p; -+ struct au_branch *br; -+ struct super_block *h_sb; -+ struct path path; -+ aufs_bindex_t bbot, bindex, bwr; -+ -+ br = NULL; -+ bbot = au_sbbot(sb); -+ bwr = -1; -+ for (bindex = 0; bindex <= bbot; bindex++) { -+ br = au_sbr(sb, bindex); -+ if (au_br_writable(br->br_perm) -+ && !au_test_fs_bad_xino(au_br_sb(br))) { -+ bwr = bindex; -+ break; -+ } -+ } -+ -+ if (bwr >= 0) { -+ file = ERR_PTR(-ENOMEM); -+ page = (void *)__get_free_page(GFP_NOFS); -+ if (unlikely(!page)) -+ goto out; -+ path.mnt = au_br_mnt(br); -+ path.dentry = au_h_dptr(sb->s_root, bwr); -+ p = d_path(&path, page, PATH_MAX - sizeof(AUFS_XINO_FNAME)); -+ file = (void *)p; -+ if (!IS_ERR(p)) { -+ strcat(p, "/" AUFS_XINO_FNAME); -+ AuDbg("%s\n", p); -+ file = au_xino_create(sb, p, /*silent*/0, /*wbrtop*/1); -+ } -+ free_page((unsigned long)page); -+ } else { -+ file = au_xino_create(sb, AUFS_XINO_DEFPATH, /*silent*/0, -+ /*wbrtop*/0); -+ if (IS_ERR(file)) -+ goto out; -+ h_sb = file->f_path.dentry->d_sb; -+ if (unlikely(au_test_fs_bad_xino(h_sb))) { -+ pr_err("xino doesn't support %s(%s)\n", -+ AUFS_XINO_DEFPATH, au_sbtype(h_sb)); -+ fput(file); -+ file = ERR_PTR(-EINVAL); -+ } -+ } -+ -+out: -+ return file; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * initialize the xinofile for the specified branch @br -+ * at the place/path where @base_file indicates. -+ * test whether another branch is on the same filesystem or not, -+ * if found then share the xinofile with another branch. -+ */ -+int au_xino_init_br(struct super_block *sb, struct au_branch *br, ino_t h_ino, -+ struct path *base) -+{ -+ int err; -+ struct au_xino_do_set_br args = { -+ .h_ino = h_ino, -+ .br = br -+ }; -+ -+ args.writef = au_sbi(sb)->si_xwrite; -+ args.bshared = sbr_find_shared(sb, /*btop*/0, au_sbbot(sb), -+ au_br_sb(br)); -+ err = au_xino_do_set_br(sb, base, &args); -+ if (unlikely(err)) -+ au_xino_put(br); -+ -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* -+ * get an unused inode number from bitmap -+ */ -+ino_t au_xino_new_ino(struct super_block *sb) -+{ -+ ino_t ino; -+ unsigned long *p, pindex, ul, pend; -+ struct au_sbinfo *sbinfo; -+ struct file *file; -+ int free_bit, err; -+ -+ if (!au_opt_test(au_mntflags(sb), XINO)) -+ return iunique(sb, AUFS_FIRST_INO); -+ -+ sbinfo = au_sbi(sb); -+ mutex_lock(&sbinfo->si_xib_mtx); -+ p = sbinfo->si_xib_buf; -+ free_bit = sbinfo->si_xib_next_bit; -+ if (free_bit < page_bits && !test_bit(free_bit, p)) -+ goto out; /* success */ -+ free_bit = find_first_zero_bit(p, page_bits); -+ if (free_bit < page_bits) -+ goto out; /* success */ -+ -+ pindex = sbinfo->si_xib_last_pindex; -+ for (ul = pindex - 1; ul < ULONG_MAX; ul--) { -+ err = xib_pindex(sb, ul); -+ if (unlikely(err)) -+ goto out_err; -+ free_bit = find_first_zero_bit(p, page_bits); -+ if (free_bit < page_bits) -+ goto out; /* success */ -+ } -+ -+ file = sbinfo->si_xib; -+ pend = vfsub_f_size_read(file) / PAGE_SIZE; -+ for (ul = pindex + 1; ul <= pend; ul++) { -+ err = xib_pindex(sb, ul); -+ if (unlikely(err)) -+ goto out_err; -+ free_bit = find_first_zero_bit(p, page_bits); -+ if (free_bit < page_bits) -+ goto out; /* success */ -+ } -+ BUG(); -+ -+out: -+ set_bit(free_bit, p); -+ sbinfo->si_xib_next_bit = free_bit + 1; -+ pindex = sbinfo->si_xib_last_pindex; -+ mutex_unlock(&sbinfo->si_xib_mtx); -+ ino = xib_calc_ino(pindex, free_bit); -+ AuDbg("i%lu\n", (unsigned long)ino); -+ return ino; -+out_err: -+ mutex_unlock(&sbinfo->si_xib_mtx); -+ AuDbg("i0\n"); -+ return 0; -+} -+ -+/* for s_op->delete_inode() */ -+void au_xino_delete_inode(struct inode *inode, const int unlinked) -+{ -+ int err; -+ unsigned int mnt_flags; -+ aufs_bindex_t bindex, bbot, bi; -+ unsigned char try_trunc; -+ struct au_iinfo *iinfo; -+ struct super_block *sb; -+ struct au_hinode *hi; -+ struct inode *h_inode; -+ struct au_branch *br; -+ vfs_writef_t xwrite; -+ struct au_xi_calc calc; -+ struct file *file; -+ -+ AuDebugOn(au_is_bad_inode(inode)); -+ -+ sb = inode->i_sb; -+ mnt_flags = au_mntflags(sb); -+ if (!au_opt_test(mnt_flags, XINO) -+ || inode->i_ino == AUFS_ROOT_INO) -+ return; -+ -+ if (unlinked) { -+ au_xigen_inc(inode); -+ au_xib_clear_bit(inode); -+ } -+ -+ iinfo = au_ii(inode); -+ bindex = iinfo->ii_btop; -+ if (bindex < 0) -+ return; -+ -+ xwrite = au_sbi(sb)->si_xwrite; -+ try_trunc = !!au_opt_test(mnt_flags, TRUNC_XINO); -+ hi = au_hinode(iinfo, bindex); -+ bbot = iinfo->ii_bbot; -+ for (; bindex <= bbot; bindex++, hi++) { -+ h_inode = hi->hi_inode; -+ if (!h_inode -+ || (!unlinked && h_inode->i_nlink)) -+ continue; -+ -+ /* inode may not be revalidated */ -+ bi = au_br_index(sb, hi->hi_id); -+ if (bi < 0) -+ continue; -+ -+ br = au_sbr(sb, bi); -+ au_xi_calc(sb, h_inode->i_ino, &calc); -+ file = au_xino_file(br->br_xino, calc.idx); -+ if (IS_ERR_OR_NULL(file)) -+ continue; -+ -+ err = au_xino_do_write(xwrite, file, &calc, /*ino*/0); -+ if (!err && try_trunc -+ && au_test_fs_trunc_xino(au_br_sb(br))) -+ xino_try_trunc(sb, br); -+ } -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+static int au_xinondir_find(struct au_xino *xi, ino_t h_ino) -+{ -+ int found, total, i; -+ -+ found = -1; -+ total = xi->xi_nondir.total; -+ for (i = 0; i < total; i++) { -+ if (xi->xi_nondir.array[i] != h_ino) -+ continue; -+ found = i; -+ break; -+ } -+ -+ return found; -+} -+ -+static int au_xinondir_expand(struct au_xino *xi) -+{ -+ int err, sz; -+ ino_t *p; -+ -+ BUILD_BUG_ON(KMALLOC_MAX_SIZE > INT_MAX); -+ -+ err = -ENOMEM; -+ sz = xi->xi_nondir.total * sizeof(ino_t); -+ if (unlikely(sz > KMALLOC_MAX_SIZE / 2)) -+ goto out; -+ p = au_kzrealloc(xi->xi_nondir.array, sz, sz << 1, GFP_ATOMIC, -+ /*may_shrink*/0); -+ if (p) { -+ xi->xi_nondir.array = p; -+ xi->xi_nondir.total <<= 1; -+ AuDbg("xi_nondir.total %d\n", xi->xi_nondir.total); -+ err = 0; -+ } -+ -+out: -+ return err; -+} -+ -+void au_xinondir_leave(struct super_block *sb, aufs_bindex_t bindex, -+ ino_t h_ino, int idx) -+{ -+ struct au_xino *xi; -+ -+ AuDebugOn(!au_opt_test(au_mntflags(sb), XINO)); -+ xi = au_sbr(sb, bindex)->br_xino; -+ AuDebugOn(idx < 0 || xi->xi_nondir.total <= idx); -+ -+ spin_lock(&xi->xi_nondir.spin); -+ AuDebugOn(xi->xi_nondir.array[idx] != h_ino); -+ xi->xi_nondir.array[idx] = 0; -+ spin_unlock(&xi->xi_nondir.spin); -+ wake_up_all(&xi->xi_nondir.wqh); -+} -+ -+int au_xinondir_enter(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, -+ int *idx) -+{ -+ int err, found, empty; -+ struct au_xino *xi; -+ -+ err = 0; -+ *idx = -1; -+ if (!au_opt_test(au_mntflags(sb), XINO)) -+ goto out; /* no xino */ -+ -+ xi = au_sbr(sb, bindex)->br_xino; -+ -+again: -+ spin_lock(&xi->xi_nondir.spin); -+ found = au_xinondir_find(xi, h_ino); -+ if (found == -1) { -+ empty = au_xinondir_find(xi, /*h_ino*/0); -+ if (empty == -1) { -+ empty = xi->xi_nondir.total; -+ err = au_xinondir_expand(xi); -+ if (unlikely(err)) -+ goto out_unlock; -+ } -+ xi->xi_nondir.array[empty] = h_ino; -+ *idx = empty; -+ } else { -+ spin_unlock(&xi->xi_nondir.spin); -+ wait_event(xi->xi_nondir.wqh, -+ xi->xi_nondir.array[found] != h_ino); -+ goto again; -+ } -+ -+out_unlock: -+ spin_unlock(&xi->xi_nondir.spin); -+out: -+ return err; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+int au_xino_path(struct seq_file *seq, struct file *file) -+{ -+ int err; -+ -+ err = au_seq_path(seq, &file->f_path); -+ if (unlikely(err)) -+ goto out; -+ -+#define Deleted "\\040(deleted)" -+ seq->count -= sizeof(Deleted) - 1; -+ AuDebugOn(memcmp(seq->buf + seq->count, Deleted, -+ sizeof(Deleted) - 1)); -+#undef Deleted -+ -+out: -+ return err; -+} -diff --git a/include/uapi/linux/aufs_type.h b/include/uapi/linux/aufs_type.h -new file mode 100644 -index 000000000000..0e3e2b175f7a ---- /dev/null -+++ b/include/uapi/linux/aufs_type.h -@@ -0,0 +1,448 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Copyright (C) 2005-2019 Junjiro R. Okajima -+ * -+ * This program, aufs is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+#ifndef __AUFS_TYPE_H__ -+#define __AUFS_TYPE_H__ -+ -+#define AUFS_NAME "aufs" -+ -+#ifdef __KERNEL__ -+/* -+ * define it before including all other headers. -+ * sched.h may use pr_* macros before defining "current", so define the -+ * no-current version first, and re-define later. -+ */ -+#define pr_fmt(fmt) AUFS_NAME " %s:%d: " fmt, __func__, __LINE__ -+#include <linux/sched.h> -+#undef pr_fmt -+#define pr_fmt(fmt) \ -+ AUFS_NAME " %s:%d:%.*s[%d]: " fmt, __func__, __LINE__, \ -+ (int)sizeof(current->comm), current->comm, current->pid -+#else -+#include <stdint.h> -+#include <sys/types.h> -+#endif /* __KERNEL__ */ -+ -+#include <linux/limits.h> -+ -+#define AUFS_VERSION "5.x-rcN-20190610" -+ -+/* todo? move this to linux-2.6.19/include/magic.h */ -+#define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's') -+ -+/* ---------------------------------------------------------------------- */ -+ -+#ifdef CONFIG_AUFS_BRANCH_MAX_127 -+typedef int8_t aufs_bindex_t; -+#define AUFS_BRANCH_MAX 127 -+#else -+typedef int16_t aufs_bindex_t; -+#ifdef CONFIG_AUFS_BRANCH_MAX_511 -+#define AUFS_BRANCH_MAX 511 -+#elif defined(CONFIG_AUFS_BRANCH_MAX_1023) -+#define AUFS_BRANCH_MAX 1023 -+#elif defined(CONFIG_AUFS_BRANCH_MAX_32767) -+#define AUFS_BRANCH_MAX 32767 -+#endif -+#endif -+ -+#ifdef __KERNEL__ -+#ifndef AUFS_BRANCH_MAX -+#error unknown CONFIG_AUFS_BRANCH_MAX value -+#endif -+#endif /* __KERNEL__ */ -+ -+/* ---------------------------------------------------------------------- */ -+ -+#define AUFS_FSTYPE AUFS_NAME -+ -+#define AUFS_ROOT_INO 2 -+#define AUFS_FIRST_INO 11 -+ -+#define AUFS_WH_PFX ".wh." -+#define AUFS_WH_PFX_LEN ((int)sizeof(AUFS_WH_PFX) - 1) -+#define AUFS_WH_TMP_LEN 4 -+/* a limit for rmdir/rename a dir and copyup */ -+#define AUFS_MAX_NAMELEN (NAME_MAX \ -+ - AUFS_WH_PFX_LEN * 2 /* doubly whiteouted */\ -+ - 1 /* dot */\ -+ - AUFS_WH_TMP_LEN) /* hex */ -+#define AUFS_XINO_FNAME "." AUFS_NAME ".xino" -+#define AUFS_XINO_DEFPATH "/tmp/" AUFS_XINO_FNAME -+#define AUFS_XINO_DEF_SEC 30 /* seconds */ -+#define AUFS_XINO_DEF_TRUNC 45 /* percentage */ -+#define AUFS_DIRWH_DEF 3 -+#define AUFS_RDCACHE_DEF 10 /* seconds */ -+#define AUFS_RDCACHE_MAX 3600 /* seconds */ -+#define AUFS_RDBLK_DEF 512 /* bytes */ -+#define AUFS_RDHASH_DEF 32 -+#define AUFS_WKQ_NAME AUFS_NAME "d" -+#define AUFS_MFS_DEF_SEC 30 /* seconds */ -+#define AUFS_MFS_MAX_SEC 3600 /* seconds */ -+#define AUFS_FHSM_CACHE_DEF_SEC 30 /* seconds */ -+#define AUFS_PLINK_WARN 50 /* number of plinks in a single bucket */ -+ -+/* pseudo-link maintenace under /proc */ -+#define AUFS_PLINK_MAINT_NAME "plink_maint" -+#define AUFS_PLINK_MAINT_DIR "fs/" AUFS_NAME -+#define AUFS_PLINK_MAINT_PATH AUFS_PLINK_MAINT_DIR "/" AUFS_PLINK_MAINT_NAME -+ -+/* dirren, renamed dir */ -+#define AUFS_DR_INFO_PFX AUFS_WH_PFX ".dr." -+#define AUFS_DR_BRHINO_NAME AUFS_WH_PFX "hino" -+/* whiteouted doubly */ -+#define AUFS_WH_DR_INFO_PFX AUFS_WH_PFX AUFS_DR_INFO_PFX -+#define AUFS_WH_DR_BRHINO AUFS_WH_PFX AUFS_DR_BRHINO_NAME -+ -+#define AUFS_DIROPQ_NAME AUFS_WH_PFX ".opq" /* whiteouted doubly */ -+#define AUFS_WH_DIROPQ AUFS_WH_PFX AUFS_DIROPQ_NAME -+ -+#define AUFS_BASE_NAME AUFS_WH_PFX AUFS_NAME -+#define AUFS_PLINKDIR_NAME AUFS_WH_PFX "plnk" -+#define AUFS_ORPHDIR_NAME AUFS_WH_PFX "orph" -+ -+/* doubly whiteouted */ -+#define AUFS_WH_BASE AUFS_WH_PFX AUFS_BASE_NAME -+#define AUFS_WH_PLINKDIR AUFS_WH_PFX AUFS_PLINKDIR_NAME -+#define AUFS_WH_ORPHDIR AUFS_WH_PFX AUFS_ORPHDIR_NAME -+ -+/* branch permissions and attributes */ -+#define AUFS_BRPERM_RW "rw" -+#define AUFS_BRPERM_RO "ro" -+#define AUFS_BRPERM_RR "rr" -+#define AUFS_BRATTR_COO_REG "coo_reg" -+#define AUFS_BRATTR_COO_ALL "coo_all" -+#define AUFS_BRATTR_FHSM "fhsm" -+#define AUFS_BRATTR_UNPIN "unpin" -+#define AUFS_BRATTR_ICEX "icex" -+#define AUFS_BRATTR_ICEX_SEC "icexsec" -+#define AUFS_BRATTR_ICEX_SYS "icexsys" -+#define AUFS_BRATTR_ICEX_TR "icextr" -+#define AUFS_BRATTR_ICEX_USR "icexusr" -+#define AUFS_BRATTR_ICEX_OTH "icexoth" -+#define AUFS_BRRATTR_WH "wh" -+#define AUFS_BRWATTR_NLWH "nolwh" -+#define AUFS_BRWATTR_MOO "moo" -+ -+#define AuBrPerm_RW 1 /* writable, hardlinkable wh */ -+#define AuBrPerm_RO (1 << 1) /* readonly */ -+#define AuBrPerm_RR (1 << 2) /* natively readonly */ -+#define AuBrPerm_Mask (AuBrPerm_RW | AuBrPerm_RO | AuBrPerm_RR) -+ -+#define AuBrAttr_COO_REG (1 << 3) /* copy-up on open */ -+#define AuBrAttr_COO_ALL (1 << 4) -+#define AuBrAttr_COO_Mask (AuBrAttr_COO_REG | AuBrAttr_COO_ALL) -+ -+#define AuBrAttr_FHSM (1 << 5) /* file-based hsm */ -+#define AuBrAttr_UNPIN (1 << 6) /* rename-able top dir of -+ branch. meaningless since -+ linux-3.18-rc1 */ -+ -+/* ignore error in copying XATTR */ -+#define AuBrAttr_ICEX_SEC (1 << 7) -+#define AuBrAttr_ICEX_SYS (1 << 8) -+#define AuBrAttr_ICEX_TR (1 << 9) -+#define AuBrAttr_ICEX_USR (1 << 10) -+#define AuBrAttr_ICEX_OTH (1 << 11) -+#define AuBrAttr_ICEX (AuBrAttr_ICEX_SEC \ -+ | AuBrAttr_ICEX_SYS \ -+ | AuBrAttr_ICEX_TR \ -+ | AuBrAttr_ICEX_USR \ -+ | AuBrAttr_ICEX_OTH) -+ -+#define AuBrRAttr_WH (1 << 12) /* whiteout-able */ -+#define AuBrRAttr_Mask AuBrRAttr_WH -+ -+#define AuBrWAttr_NoLinkWH (1 << 13) /* un-hardlinkable whiteouts */ -+#define AuBrWAttr_MOO (1 << 14) /* move-up on open */ -+#define AuBrWAttr_Mask (AuBrWAttr_NoLinkWH | AuBrWAttr_MOO) -+ -+#define AuBrAttr_CMOO_Mask (AuBrAttr_COO_Mask | AuBrWAttr_MOO) -+ -+/* #warning test userspace */ -+#ifdef __KERNEL__ -+#ifndef CONFIG_AUFS_FHSM -+#undef AuBrAttr_FHSM -+#define AuBrAttr_FHSM 0 -+#endif -+#ifndef CONFIG_AUFS_XATTR -+#undef AuBrAttr_ICEX -+#define AuBrAttr_ICEX 0 -+#undef AuBrAttr_ICEX_SEC -+#define AuBrAttr_ICEX_SEC 0 -+#undef AuBrAttr_ICEX_SYS -+#define AuBrAttr_ICEX_SYS 0 -+#undef AuBrAttr_ICEX_TR -+#define AuBrAttr_ICEX_TR 0 -+#undef AuBrAttr_ICEX_USR -+#define AuBrAttr_ICEX_USR 0 -+#undef AuBrAttr_ICEX_OTH -+#define AuBrAttr_ICEX_OTH 0 -+#endif -+#endif -+ -+/* the longest combination */ -+/* AUFS_BRATTR_ICEX and AUFS_BRATTR_ICEX_TR don't affect here */ -+#define AuBrPermStrSz sizeof(AUFS_BRPERM_RW \ -+ "+" AUFS_BRATTR_COO_REG \ -+ "+" AUFS_BRATTR_FHSM \ -+ "+" AUFS_BRATTR_UNPIN \ -+ "+" AUFS_BRATTR_ICEX_SEC \ -+ "+" AUFS_BRATTR_ICEX_SYS \ -+ "+" AUFS_BRATTR_ICEX_USR \ -+ "+" AUFS_BRATTR_ICEX_OTH \ -+ "+" AUFS_BRWATTR_NLWH) -+ -+typedef struct { -+ char a[AuBrPermStrSz]; -+} au_br_perm_str_t; -+ -+static inline int au_br_writable(int brperm) -+{ -+ return brperm & AuBrPerm_RW; -+} -+ -+static inline int au_br_whable(int brperm) -+{ -+ return brperm & (AuBrPerm_RW | AuBrRAttr_WH); -+} -+ -+static inline int au_br_wh_linkable(int brperm) -+{ -+ return !(brperm & AuBrWAttr_NoLinkWH); -+} -+ -+static inline int au_br_cmoo(int brperm) -+{ -+ return brperm & AuBrAttr_CMOO_Mask; -+} -+ -+static inline int au_br_fhsm(int brperm) -+{ -+ return brperm & AuBrAttr_FHSM; -+} -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* ioctl */ -+enum { -+ /* readdir in userspace */ -+ AuCtl_RDU, -+ AuCtl_RDU_INO, -+ -+ AuCtl_WBR_FD, /* pathconf wrapper */ -+ AuCtl_IBUSY, /* busy inode */ -+ AuCtl_MVDOWN, /* move-down */ -+ AuCtl_BR, /* info about branches */ -+ AuCtl_FHSM_FD /* connection for fhsm */ -+}; -+ -+/* borrowed from linux/include/linux/kernel.h */ -+#ifndef ALIGN -+#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1) -+#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask)) -+#endif -+ -+/* borrowed from linux/include/linux/compiler-gcc3.h */ -+#ifndef __aligned -+#define __aligned(x) __attribute__((aligned(x))) -+#endif -+ -+#ifdef __KERNEL__ -+#ifndef __packed -+#define __packed __attribute__((packed)) -+#endif -+#endif -+ -+struct au_rdu_cookie { -+ uint64_t h_pos; -+ int16_t bindex; -+ uint8_t flags; -+ uint8_t pad; -+ uint32_t generation; -+} __aligned(8); -+ -+struct au_rdu_ent { -+ uint64_t ino; -+ int16_t bindex; -+ uint8_t type; -+ uint8_t nlen; -+ uint8_t wh; -+ char name[0]; -+} __aligned(8); -+ -+static inline int au_rdu_len(int nlen) -+{ -+ /* include the terminating NULL */ -+ return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1, -+ sizeof(uint64_t)); -+} -+ -+union au_rdu_ent_ul { -+ struct au_rdu_ent __user *e; -+ uint64_t ul; -+}; -+ -+enum { -+ AufsCtlRduV_SZ, -+ AufsCtlRduV_End -+}; -+ -+struct aufs_rdu { -+ /* input */ -+ union { -+ uint64_t sz; /* AuCtl_RDU */ -+ uint64_t nent; /* AuCtl_RDU_INO */ -+ }; -+ union au_rdu_ent_ul ent; -+ uint16_t verify[AufsCtlRduV_End]; -+ -+ /* input/output */ -+ uint32_t blk; -+ -+ /* output */ -+ union au_rdu_ent_ul tail; -+ /* number of entries which were added in a single call */ -+ uint64_t rent; -+ uint8_t full; -+ uint8_t shwh; -+ -+ struct au_rdu_cookie cookie; -+} __aligned(8); -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* dirren. the branch is identified by the filename who contains this */ -+struct au_drinfo { -+ uint64_t ino; -+ union { -+ uint8_t oldnamelen; -+ uint64_t _padding; -+ }; -+ uint8_t oldname[0]; -+} __aligned(8); -+ -+struct au_drinfo_fdata { -+ uint32_t magic; -+ struct au_drinfo drinfo; -+} __aligned(8); -+ -+#define AUFS_DRINFO_MAGIC_V1 ('a' << 24 | 'd' << 16 | 'r' << 8 | 0x01) -+/* future */ -+#define AUFS_DRINFO_MAGIC_V2 ('a' << 24 | 'd' << 16 | 'r' << 8 | 0x02) -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct aufs_wbr_fd { -+ uint32_t oflags; -+ int16_t brid; -+} __aligned(8); -+ -+/* ---------------------------------------------------------------------- */ -+ -+struct aufs_ibusy { -+ uint64_t ino, h_ino; -+ int16_t bindex; -+} __aligned(8); -+ -+/* ---------------------------------------------------------------------- */ -+ -+/* error code for move-down */ -+/* the actual message strings are implemented in aufs-util.git */ -+enum { -+ EAU_MVDOWN_OPAQUE = 1, -+ EAU_MVDOWN_WHITEOUT, -+ EAU_MVDOWN_UPPER, -+ EAU_MVDOWN_BOTTOM, -+ EAU_MVDOWN_NOUPPER, -+ EAU_MVDOWN_NOLOWERBR, -+ EAU_Last -+}; -+ -+/* flags for move-down */ -+#define AUFS_MVDOWN_DMSG 1 -+#define AUFS_MVDOWN_OWLOWER (1 << 1) /* overwrite lower */ -+#define AUFS_MVDOWN_KUPPER (1 << 2) /* keep upper */ -+#define AUFS_MVDOWN_ROLOWER (1 << 3) /* do even if lower is RO */ -+#define AUFS_MVDOWN_ROLOWER_R (1 << 4) /* did on lower RO */ -+#define AUFS_MVDOWN_ROUPPER (1 << 5) /* do even if upper is RO */ -+#define AUFS_MVDOWN_ROUPPER_R (1 << 6) /* did on upper RO */ -+#define AUFS_MVDOWN_BRID_UPPER (1 << 7) /* upper brid */ -+#define AUFS_MVDOWN_BRID_LOWER (1 << 8) /* lower brid */ -+#define AUFS_MVDOWN_FHSM_LOWER (1 << 9) /* find fhsm attr for lower */ -+#define AUFS_MVDOWN_STFS (1 << 10) /* req. stfs */ -+#define AUFS_MVDOWN_STFS_FAILED (1 << 11) /* output: stfs is unusable */ -+#define AUFS_MVDOWN_BOTTOM (1 << 12) /* output: no more lowers */ -+ -+/* index for move-down */ -+enum { -+ AUFS_MVDOWN_UPPER, -+ AUFS_MVDOWN_LOWER, -+ AUFS_MVDOWN_NARRAY -+}; -+ -+/* -+ * additional info of move-down -+ * number of free blocks and inodes. -+ * subset of struct kstatfs, but smaller and always 64bit. -+ */ -+struct aufs_stfs { -+ uint64_t f_blocks; -+ uint64_t f_bavail; -+ uint64_t f_files; -+ uint64_t f_ffree; -+}; -+ -+struct aufs_stbr { -+ int16_t brid; /* optional input */ -+ int16_t bindex; /* output */ -+ struct aufs_stfs stfs; /* output when AUFS_MVDOWN_STFS set */ -+} __aligned(8); -+ -+struct aufs_mvdown { -+ uint32_t flags; /* input/output */ -+ struct aufs_stbr stbr[AUFS_MVDOWN_NARRAY]; /* input/output */ -+ int8_t au_errno; /* output */ -+} __aligned(8); -+ -+/* ---------------------------------------------------------------------- */ -+ -+union aufs_brinfo { -+ /* PATH_MAX may differ between kernel-space and user-space */ -+ char _spacer[4096]; -+ struct { -+ int16_t id; -+ int perm; -+ char path[0]; -+ }; -+} __aligned(8); -+ -+/* ---------------------------------------------------------------------- */ -+ -+#define AuCtlType 'A' -+#define AUFS_CTL_RDU _IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu) -+#define AUFS_CTL_RDU_INO _IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu) -+#define AUFS_CTL_WBR_FD _IOW(AuCtlType, AuCtl_WBR_FD, \ -+ struct aufs_wbr_fd) -+#define AUFS_CTL_IBUSY _IOWR(AuCtlType, AuCtl_IBUSY, struct aufs_ibusy) -+#define AUFS_CTL_MVDOWN _IOWR(AuCtlType, AuCtl_MVDOWN, \ -+ struct aufs_mvdown) -+#define AUFS_CTL_BRINFO _IOW(AuCtlType, AuCtl_BR, union aufs_brinfo) -+#define AUFS_CTL_FHSM_FD _IOW(AuCtlType, AuCtl_FHSM_FD, int) -+ -+#endif /* __AUFS_TYPE_H__ */ --- -2.19.1 - diff --git a/features/aufs/aufs5-fix-build-on-v5.3.patch b/features/aufs/aufs5-fix-build-on-v5.3.patch deleted file mode 100644 index cbcc369e..00000000 --- a/features/aufs/aufs5-fix-build-on-v5.3.patch +++ /dev/null @@ -1,30 +0,0 @@ -From 73625e20eaf6a41d5c39bc667c67f9e7fdaebdfe Mon Sep 17 00:00:00 2001 -From: Bruce Ashfield <bruce.ashfield@gmail.com> -Date: Mon, 22 Jul 2019 23:14:41 -0400 -Subject: [PATCH] aufs5: fix build on v5.3+ - -commit 9af0f1a46bbb6ad9ee8b35957251f4aa826b023f changes the rw_sem -task owner to an atomic type. We switch to using the introduced -helper function to get aufs compiling against 5.3 - -Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> ---- - fs/aufs/i_op.c | 2 +- - 1 file changed, 1 insertion(+), 1 deletion(-) - -diff --git a/fs/aufs/i_op.c b/fs/aufs/i_op.c -index 4f5001ebd0f4..3455f2ecb407 100644 ---- a/fs/aufs/i_op.c -+++ b/fs/aufs/i_op.c -@@ -641,7 +641,7 @@ int au_pin_hdir_relock(struct au_pin *p) - static void au_pin_hdir_set_owner(struct au_pin *p, struct task_struct *task) - { - #if !defined(CONFIG_RWSEM_GENERIC_SPINLOCK) && defined(CONFIG_RWSEM_SPIN_ON_OWNER) -- p->hdir->hi_inode->i_rwsem.owner = task; -+ atomic_long_set(&p->hdir->hi_inode->i_rwsem.owner, (long)task); - #endif - } - --- -2.19.1 - diff --git a/features/aufs/aufs5-kbuild-support.patch b/features/aufs/aufs5-kbuild-support.patch deleted file mode 100644 index a4ded452..00000000 --- a/features/aufs/aufs5-kbuild-support.patch +++ /dev/null @@ -1,37 +0,0 @@ -From 2cd5e59710c95982b25db96ca7aa2d676ff3a66c Mon Sep 17 00:00:00 2001 -From: Bruce Ashfield <bruce.ashfield@gmail.com> -Date: Wed, 3 Jul 2019 10:53:33 -0400 -Subject: [PATCH 1/5] aufs5: kbuild support - -Application of aufs5-kbuild.patch - -Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> ---- - fs/Kconfig | 1 + - fs/Makefile | 1 + - 2 files changed, 2 insertions(+) - -diff --git a/fs/Kconfig b/fs/Kconfig -index bfebc84805a3..dae56c7f33fb 100644 ---- a/fs/Kconfig -+++ b/fs/Kconfig -@@ -263,6 +263,7 @@ source "fs/romfs/Kconfig" - source "fs/pstore/Kconfig" - source "fs/sysv/Kconfig" - source "fs/ufs/Kconfig" -+source "fs/aufs/Kconfig" - - endif # MISC_FILESYSTEMS - -diff --git a/fs/Makefile b/fs/Makefile -index a64e5b9c9d90..99d54d031b24 100644 ---- a/fs/Makefile -+++ b/fs/Makefile -@@ -131,3 +131,4 @@ obj-$(CONFIG_CEPH_FS) += ceph/ - obj-$(CONFIG_PSTORE) += pstore/ - obj-$(CONFIG_EFIVAR_FS) += efivarfs/ - obj-$(CONFIG_YAFFS_FS) += yaffs2/ -+obj-$(CONFIG_AUFS_FS) += aufs/ --- -2.19.1 - diff --git a/features/aufs/aufs5-mmap-support.patch b/features/aufs/aufs5-mmap-support.patch deleted file mode 100644 index 88cf25d1..00000000 --- a/features/aufs/aufs5-mmap-support.patch +++ /dev/null @@ -1,422 +0,0 @@ -From a2e902a4f19b3b5d3dfab511bdec517b2457ba9c Mon Sep 17 00:00:00 2001 -From: Bruce Ashfield <bruce.ashfield@gmail.com> -Date: Wed, 3 Jul 2019 10:55:03 -0400 -Subject: [PATCH] aufs5: mmap support - -Application of; aufs5-mmap.patch - -Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> ---- - fs/proc/base.c | 2 +- - fs/proc/nommu.c | 5 ++- - fs/proc/task_mmu.c | 7 +++- - fs/proc/task_nommu.c | 5 ++- - include/linux/mm.h | 22 ++++++++++ - include/linux/mm_types.h | 2 + - kernel/fork.c | 2 +- - mm/Makefile | 2 +- - mm/filemap.c | 2 +- - mm/mmap.c | 33 +++++++++++---- - mm/nommu.c | 10 ++--- - mm/prfile.c | 86 ++++++++++++++++++++++++++++++++++++++++ - 12 files changed, 157 insertions(+), 21 deletions(-) - create mode 100644 mm/prfile.c - -diff --git a/fs/proc/base.c b/fs/proc/base.c -index ebea9501afb8..dc7edc5f7267 100644 ---- a/fs/proc/base.c -+++ b/fs/proc/base.c -@@ -2037,7 +2037,7 @@ static int map_files_get_link(struct dentry *dentry, struct path *path) - rc = -ENOENT; - vma = find_exact_vma(mm, vm_start, vm_end); - if (vma && vma->vm_file) { -- *path = vma->vm_file->f_path; -+ *path = vma_pr_or_file(vma)->f_path; - path_get(path); - rc = 0; - } -diff --git a/fs/proc/nommu.c b/fs/proc/nommu.c -index 14c2badb8fd9..65afe5287e43 100644 ---- a/fs/proc/nommu.c -+++ b/fs/proc/nommu.c -@@ -41,7 +41,10 @@ static int nommu_region_show(struct seq_file *m, struct vm_region *region) - file = region->vm_file; - - if (file) { -- struct inode *inode = file_inode(region->vm_file); -+ struct inode *inode; -+ -+ file = vmr_pr_or_file(region); -+ inode = file_inode(file); - dev = inode->i_sb->s_dev; - ino = inode->i_ino; - } -diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c -index 731642e0f5a0..e8d6259de65b 100644 ---- a/fs/proc/task_mmu.c -+++ b/fs/proc/task_mmu.c -@@ -309,7 +309,10 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma) - const char *name = NULL; - - if (file) { -- struct inode *inode = file_inode(vma->vm_file); -+ struct inode *inode; -+ -+ file = vma_pr_or_file(vma); -+ inode = file_inode(file); - dev = inode->i_sb->s_dev; - ino = inode->i_ino; - pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; -@@ -1807,7 +1810,7 @@ static int show_numa_map(struct seq_file *m, void *v) - struct proc_maps_private *proc_priv = &numa_priv->proc_maps; - struct vm_area_struct *vma = v; - struct numa_maps *md = &numa_priv->md; -- struct file *file = vma->vm_file; -+ struct file *file = vma_pr_or_file(vma); - struct mm_struct *mm = vma->vm_mm; - struct mm_walk walk = { - .hugetlb_entry = gather_hugetlb_stats, -diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c -index 7907e6419e57..d17209cf52bc 100644 ---- a/fs/proc/task_nommu.c -+++ b/fs/proc/task_nommu.c -@@ -155,7 +155,10 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma) - file = vma->vm_file; - - if (file) { -- struct inode *inode = file_inode(vma->vm_file); -+ struct inode *inode; -+ -+ file = vma_pr_or_file(vma); -+ inode = file_inode(file); - dev = inode->i_sb->s_dev; - ino = inode->i_ino; - pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT; -diff --git a/include/linux/mm.h b/include/linux/mm.h -index 0334ca97c584..3bdae823daee 100644 ---- a/include/linux/mm.h -+++ b/include/linux/mm.h -@@ -1538,6 +1538,28 @@ static inline void unmap_shared_mapping_range(struct address_space *mapping, - unmap_mapping_range(mapping, holebegin, holelen, 0); - } - -+extern void vma_do_file_update_time(struct vm_area_struct *, const char[], int); -+extern struct file *vma_do_pr_or_file(struct vm_area_struct *, const char[], -+ int); -+extern void vma_do_get_file(struct vm_area_struct *, const char[], int); -+extern void vma_do_fput(struct vm_area_struct *, const char[], int); -+ -+#define vma_file_update_time(vma) vma_do_file_update_time(vma, __func__, \ -+ __LINE__) -+#define vma_pr_or_file(vma) vma_do_pr_or_file(vma, __func__, \ -+ __LINE__) -+#define vma_get_file(vma) vma_do_get_file(vma, __func__, __LINE__) -+#define vma_fput(vma) vma_do_fput(vma, __func__, __LINE__) -+ -+#ifndef CONFIG_MMU -+extern struct file *vmr_do_pr_or_file(struct vm_region *, const char[], int); -+extern void vmr_do_fput(struct vm_region *, const char[], int); -+ -+#define vmr_pr_or_file(region) vmr_do_pr_or_file(region, __func__, \ -+ __LINE__) -+#define vmr_fput(region) vmr_do_fput(region, __func__, __LINE__) -+#endif /* !CONFIG_MMU */ -+ - extern int access_process_vm(struct task_struct *tsk, unsigned long addr, - void *buf, int len, unsigned int gup_flags); - extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, -diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h -index 3a37a89eb7a7..cb5e5ebe4dcf 100644 ---- a/include/linux/mm_types.h -+++ b/include/linux/mm_types.h -@@ -253,6 +253,7 @@ struct vm_region { - unsigned long vm_top; /* region allocated to here */ - unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */ - struct file *vm_file; /* the backing file or NULL */ -+ struct file *vm_prfile; /* the virtual backing file or NULL */ - - int vm_usage; /* region usage count (access under nommu_region_sem) */ - bool vm_icache_flushed : 1; /* true if the icache has been flushed for -@@ -327,6 +328,7 @@ struct vm_area_struct { - unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE - units */ - struct file * vm_file; /* File we map to (can be NULL). */ -+ struct file *vm_prfile; /* shadow of vm_file */ - void * vm_private_data; /* was vm_pte (shared mem) */ - - #ifdef CONFIG_SWAP -diff --git a/kernel/fork.c b/kernel/fork.c -index d8ae0f1b4148..1ce91c08a2b0 100644 ---- a/kernel/fork.c -+++ b/kernel/fork.c -@@ -553,7 +553,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, - struct inode *inode = file_inode(file); - struct address_space *mapping = file->f_mapping; - -- get_file(file); -+ vma_get_file(tmp); - if (tmp->vm_flags & VM_DENYWRITE) - atomic_dec(&inode->i_writecount); - i_mmap_lock_write(mapping); -diff --git a/mm/Makefile b/mm/Makefile -index 338e528ad436..ee91e8c78606 100644 ---- a/mm/Makefile -+++ b/mm/Makefile -@@ -39,7 +39,7 @@ obj-y := filemap.o mempool.o oom_kill.o fadvise.o \ - mm_init.o mmu_context.o percpu.o slab_common.o \ - compaction.o vmacache.o \ - interval_tree.o list_lru.o workingset.o \ -- debug.o gup.o $(mmu-y) -+ prfile.o debug.o gup.o $(mmu-y) - - # Give 'page_alloc' its own module-parameter namespace - page-alloc-y := page_alloc.o -diff --git a/mm/filemap.c b/mm/filemap.c -index d0cf700bf201..5cac93e7bf67 100644 ---- a/mm/filemap.c -+++ b/mm/filemap.c -@@ -2721,7 +2721,7 @@ vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf) - vm_fault_t ret = VM_FAULT_LOCKED; - - sb_start_pagefault(inode->i_sb); -- file_update_time(vmf->vma->vm_file); -+ vma_file_update_time(vmf->vma); - lock_page(page); - if (page->mapping != inode->i_mapping) { - unlock_page(page); -diff --git a/mm/mmap.c b/mm/mmap.c -index 7e8c3e8ae75f..d8a903f61262 100644 ---- a/mm/mmap.c -+++ b/mm/mmap.c -@@ -182,7 +182,7 @@ static struct vm_area_struct *remove_vma(struct vm_area_struct *vma) - if (vma->vm_ops && vma->vm_ops->close) - vma->vm_ops->close(vma); - if (vma->vm_file) -- fput(vma->vm_file); -+ vma_fput(vma); - mpol_put(vma_policy(vma)); - vm_area_free(vma); - return next; -@@ -931,7 +931,7 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start, - if (remove_next) { - if (file) { - uprobe_munmap(next, next->vm_start, next->vm_end); -- fput(file); -+ vma_fput(vma); - } - if (next->anon_vma) - anon_vma_merge(vma, next); -@@ -1847,8 +1847,8 @@ unsigned long mmap_region(struct file *file, unsigned long addr, - return addr; - - unmap_and_free_vma: -+ vma_fput(vma); - vma->vm_file = NULL; -- fput(file); - - /* Undo any partial mapping done by a device driver. */ - unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end); -@@ -2680,7 +2680,7 @@ int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma, - goto out_free_mpol; - - if (new->vm_file) -- get_file(new->vm_file); -+ vma_get_file(new); - - if (new->vm_ops && new->vm_ops->open) - new->vm_ops->open(new); -@@ -2699,7 +2699,7 @@ int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma, - if (new->vm_ops && new->vm_ops->close) - new->vm_ops->close(new); - if (new->vm_file) -- fput(new->vm_file); -+ vma_fput(new); - unlink_anon_vmas(new); - out_free_mpol: - mpol_put(vma_policy(new)); -@@ -2890,7 +2890,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, - struct vm_area_struct *vma; - unsigned long populate = 0; - unsigned long ret = -EINVAL; -- struct file *file; -+ struct file *file, *prfile; - - pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.rst.\n", - current->comm, current->pid); -@@ -2965,10 +2965,27 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, - } - } - -- file = get_file(vma->vm_file); -+ vma_get_file(vma); -+ file = vma->vm_file; -+ prfile = vma->vm_prfile; - ret = do_mmap_pgoff(vma->vm_file, start, size, - prot, flags, pgoff, &populate, NULL); -+ if (!IS_ERR_VALUE(ret) && file && prfile) { -+ struct vm_area_struct *new_vma; -+ -+ new_vma = find_vma(mm, ret); -+ if (!new_vma->vm_prfile) -+ new_vma->vm_prfile = prfile; -+ if (new_vma != vma) -+ get_file(prfile); -+ } -+ /* -+ * two fput()s instead of vma_fput(vma), -+ * coz vma may not be available anymore. -+ */ - fput(file); -+ if (prfile) -+ fput(prfile); - out: - up_write(&mm->mmap_sem); - if (populate) -@@ -3258,7 +3275,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap, - if (anon_vma_clone(new_vma, vma)) - goto out_free_mempol; - if (new_vma->vm_file) -- get_file(new_vma->vm_file); -+ vma_get_file(new_vma); - if (new_vma->vm_ops && new_vma->vm_ops->open) - new_vma->vm_ops->open(new_vma); - vma_link(mm, new_vma, prev, rb_link, rb_parent); -diff --git a/mm/nommu.c b/mm/nommu.c -index fed1b6e9c89b..0d43b248ed54 100644 ---- a/mm/nommu.c -+++ b/mm/nommu.c -@@ -552,7 +552,7 @@ static void __put_nommu_region(struct vm_region *region) - up_write(&nommu_region_sem); - - if (region->vm_file) -- fput(region->vm_file); -+ vmr_fput(region); - - /* IO memory and memory shared directly out of the pagecache - * from ramfs/tmpfs mustn't be released here */ -@@ -690,7 +690,7 @@ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma) - if (vma->vm_ops && vma->vm_ops->close) - vma->vm_ops->close(vma); - if (vma->vm_file) -- fput(vma->vm_file); -+ vma_fput(vma); - put_nommu_region(vma->vm_region); - vm_area_free(vma); - } -@@ -1213,7 +1213,7 @@ unsigned long do_mmap(struct file *file, - goto error_just_free; - } - } -- fput(region->vm_file); -+ vmr_fput(region); - kmem_cache_free(vm_region_jar, region); - region = pregion; - result = start; -@@ -1290,10 +1290,10 @@ unsigned long do_mmap(struct file *file, - up_write(&nommu_region_sem); - error: - if (region->vm_file) -- fput(region->vm_file); -+ vmr_fput(region); - kmem_cache_free(vm_region_jar, region); - if (vma->vm_file) -- fput(vma->vm_file); -+ vma_fput(vma); - vm_area_free(vma); - return ret; - -diff --git a/mm/prfile.c b/mm/prfile.c -new file mode 100644 -index 000000000000..024cdcfae1b1 ---- /dev/null -+++ b/mm/prfile.c -@@ -0,0 +1,86 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Mainly for aufs which mmap(2) different file and wants to print different -+ * path in /proc/PID/maps. -+ * Call these functions via macros defined in linux/mm.h. -+ * -+ * See Documentation/filesystems/aufs/design/06mmap.txt -+ * -+ * Copyright (c) 2014-2019 Junjro R. Okajima -+ * Copyright (c) 2014 Ian Campbell -+ */ -+ -+#include <linux/mm.h> -+#include <linux/file.h> -+#include <linux/fs.h> -+ -+/* #define PRFILE_TRACE */ -+static inline void prfile_trace(struct file *f, struct file *pr, -+ const char func[], int line, const char func2[]) -+{ -+#ifdef PRFILE_TRACE -+ if (pr) -+ pr_info("%s:%d: %s, %pD2\n", func, line, func2, f); -+#endif -+} -+ -+void vma_do_file_update_time(struct vm_area_struct *vma, const char func[], -+ int line) -+{ -+ struct file *f = vma->vm_file, *pr = vma->vm_prfile; -+ -+ prfile_trace(f, pr, func, line, __func__); -+ file_update_time(f); -+ if (f && pr) -+ file_update_time(pr); -+} -+ -+struct file *vma_do_pr_or_file(struct vm_area_struct *vma, const char func[], -+ int line) -+{ -+ struct file *f = vma->vm_file, *pr = vma->vm_prfile; -+ -+ prfile_trace(f, pr, func, line, __func__); -+ return (f && pr) ? pr : f; -+} -+ -+void vma_do_get_file(struct vm_area_struct *vma, const char func[], int line) -+{ -+ struct file *f = vma->vm_file, *pr = vma->vm_prfile; -+ -+ prfile_trace(f, pr, func, line, __func__); -+ get_file(f); -+ if (f && pr) -+ get_file(pr); -+} -+ -+void vma_do_fput(struct vm_area_struct *vma, const char func[], int line) -+{ -+ struct file *f = vma->vm_file, *pr = vma->vm_prfile; -+ -+ prfile_trace(f, pr, func, line, __func__); -+ fput(f); -+ if (f && pr) -+ fput(pr); -+} -+ -+#ifndef CONFIG_MMU -+struct file *vmr_do_pr_or_file(struct vm_region *region, const char func[], -+ int line) -+{ -+ struct file *f = region->vm_file, *pr = region->vm_prfile; -+ -+ prfile_trace(f, pr, func, line, __func__); -+ return (f && pr) ? pr : f; -+} -+ -+void vmr_do_fput(struct vm_region *region, const char func[], int line) -+{ -+ struct file *f = region->vm_file, *pr = region->vm_prfile; -+ -+ prfile_trace(f, pr, func, line, __func__); -+ fput(f); -+ if (f && pr) -+ fput(pr); -+} -+#endif /* !CONFIG_MMU */ --- -2.19.1 - diff --git a/features/aufs/aufs5-standalone-support.patch b/features/aufs/aufs5-standalone-support.patch deleted file mode 100644 index 220c9056..00000000 --- a/features/aufs/aufs5-standalone-support.patch +++ /dev/null @@ -1,397 +0,0 @@ -From 9f6e3107b4296d9c553ec78c7ee54b10cce15a9a Mon Sep 17 00:00:00 2001 -From: Bruce Ashfield <bruce.ashfield@gmail.com> -Date: Wed, 3 Jul 2019 10:55:36 -0400 -Subject: [PATCH 4/5] aufs5: standalone support - -Application of: aufs5-standalone.patch - -Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> ---- - fs/dcache.c | 2 ++ - fs/exec.c | 1 + - fs/fcntl.c | 1 + - fs/file_table.c | 3 +++ - fs/inode.c | 1 + - fs/namespace.c | 3 +++ - fs/notify/group.c | 3 +++ - fs/notify/mark.c | 4 ++++ - fs/open.c | 1 + - fs/read_write.c | 4 ++++ - fs/splice.c | 2 ++ - fs/sync.c | 1 + - fs/xattr.c | 1 + - kernel/locking/lockdep.c | 1 + - kernel/task_work.c | 1 + - security/device_cgroup.c | 1 + - security/security.c | 8 ++++++++ - 17 files changed, 38 insertions(+) - -diff --git a/fs/dcache.c b/fs/dcache.c -index a688a042d022..3fc74e471924 100644 ---- a/fs/dcache.c -+++ b/fs/dcache.c -@@ -1352,6 +1352,7 @@ void d_walk(struct dentry *parent, void *data, - seq = 1; - goto again; - } -+EXPORT_SYMBOL_GPL(d_walk); - - struct check_mount { - struct vfsmount *mnt; -@@ -2850,6 +2851,7 @@ void d_exchange(struct dentry *dentry1, struct dentry *dentry2) - - write_sequnlock(&rename_lock); - } -+EXPORT_SYMBOL_GPL(d_exchange); - - /** - * d_ancestor - search for an ancestor -diff --git a/fs/exec.c b/fs/exec.c -index 89a500bb897a..1a722915ed77 100644 ---- a/fs/exec.c -+++ b/fs/exec.c -@@ -110,6 +110,7 @@ bool path_noexec(const struct path *path) - return (path->mnt->mnt_flags & MNT_NOEXEC) || - (path->mnt->mnt_sb->s_iflags & SB_I_NOEXEC); - } -+EXPORT_SYMBOL_GPL(path_noexec); - - #ifdef CONFIG_USELIB - /* -diff --git a/fs/fcntl.c b/fs/fcntl.c -index d62303c5472a..d4ad34463848 100644 ---- a/fs/fcntl.c -+++ b/fs/fcntl.c -@@ -85,6 +85,7 @@ int setfl(int fd, struct file * filp, unsigned long arg) - out: - return error; - } -+EXPORT_SYMBOL_GPL(setfl); - - static void f_modown(struct file *filp, struct pid *pid, enum pid_type type, - int force) -diff --git a/fs/file_table.c b/fs/file_table.c -index b07b53f24ff5..34b9bbf4c556 100644 ---- a/fs/file_table.c -+++ b/fs/file_table.c -@@ -162,6 +162,7 @@ struct file *alloc_empty_file(int flags, const struct cred *cred) - } - return ERR_PTR(-ENFILE); - } -+EXPORT_SYMBOL_GPL(alloc_empty_file); - - /* - * Variant of alloc_empty_file() that doesn't check and modify nr_files. -@@ -327,6 +328,7 @@ void flush_delayed_fput(void) - { - delayed_fput(NULL); - } -+EXPORT_SYMBOL_GPL(flush_delayed_fput); - - static DECLARE_DELAYED_WORK(delayed_fput_work, delayed_fput); - -@@ -374,6 +376,7 @@ void __fput_sync(struct file *file) - } - - EXPORT_SYMBOL(fput); -+EXPORT_SYMBOL_GPL(__fput_sync); - - void __init files_init(void) - { -diff --git a/fs/inode.c b/fs/inode.c -index 9b908c37971f..ed54d3759219 100644 ---- a/fs/inode.c -+++ b/fs/inode.c -@@ -1679,6 +1679,7 @@ int update_time(struct inode *inode, struct timespec64 *time, int flags) - - return update_time(inode, time, flags); - } -+EXPORT_SYMBOL_GPL(update_time); - - /** - * touch_atime - update the access time -diff --git a/fs/namespace.c b/fs/namespace.c -index d6e9681f044d..3e9e0ba7980b 100644 ---- a/fs/namespace.c -+++ b/fs/namespace.c -@@ -436,6 +436,7 @@ void __mnt_drop_write(struct vfsmount *mnt) - mnt_dec_writers(real_mount(mnt)); - preempt_enable(); - } -+EXPORT_SYMBOL_GPL(__mnt_drop_write); - - /** - * mnt_drop_write - give up write access to a mount -@@ -775,6 +776,7 @@ int is_current_mnt_ns(struct vfsmount *mnt) - { - return check_mnt(real_mount(mnt)); - } -+EXPORT_SYMBOL_GPL(is_current_mnt_ns); - - /* - * vfsmount lock must be held for write -@@ -1908,6 +1910,7 @@ int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg, - } - return 0; - } -+EXPORT_SYMBOL_GPL(iterate_mounts); - - static void lock_mnt_tree(struct mount *mnt) - { -diff --git a/fs/notify/group.c b/fs/notify/group.c -index 0391190305cc..0b9f7f6d8390 100644 ---- a/fs/notify/group.c -+++ b/fs/notify/group.c -@@ -99,6 +99,7 @@ void fsnotify_get_group(struct fsnotify_group *group) - { - refcount_inc(&group->refcnt); - } -+EXPORT_SYMBOL_GPL(fsnotify_get_group); - - /* - * Drop a reference to a group. Free it if it's through. -@@ -108,6 +109,7 @@ void fsnotify_put_group(struct fsnotify_group *group) - if (refcount_dec_and_test(&group->refcnt)) - fsnotify_final_destroy_group(group); - } -+EXPORT_SYMBOL_GPL(fsnotify_put_group); - - /* - * Create a new fsnotify_group and hold a reference for the group returned. -@@ -137,6 +139,7 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops) - - return group; - } -+EXPORT_SYMBOL_GPL(fsnotify_alloc_group); - - int fsnotify_fasync(int fd, struct file *file, int on) - { -diff --git a/fs/notify/mark.c b/fs/notify/mark.c -index 99ddd126f6f0..2154d69a2c7a 100644 ---- a/fs/notify/mark.c -+++ b/fs/notify/mark.c -@@ -276,6 +276,7 @@ void fsnotify_put_mark(struct fsnotify_mark *mark) - queue_delayed_work(system_unbound_wq, &reaper_work, - FSNOTIFY_REAPER_DELAY); - } -+EXPORT_SYMBOL_GPL(fsnotify_put_mark); - - /* - * Get mark reference when we found the mark via lockless traversal of object -@@ -430,6 +431,7 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark, - mutex_unlock(&group->mark_mutex); - fsnotify_free_mark(mark); - } -+EXPORT_SYMBOL_GPL(fsnotify_destroy_mark); - - /* - * Sorting function for lists of fsnotify marks. -@@ -685,6 +687,7 @@ int fsnotify_add_mark(struct fsnotify_mark *mark, fsnotify_connp_t *connp, - mutex_unlock(&group->mark_mutex); - return ret; - } -+EXPORT_SYMBOL_GPL(fsnotify_add_mark); - - /* - * Given a list of marks, find the mark associated with given group. If found -@@ -809,6 +812,7 @@ void fsnotify_init_mark(struct fsnotify_mark *mark, - mark->group = group; - WRITE_ONCE(mark->connector, NULL); - } -+EXPORT_SYMBOL_GPL(fsnotify_init_mark); - - /* - * Destroy all marks in destroy_list, waits for SRCU period to finish before -diff --git a/fs/open.c b/fs/open.c -index b5b80469b93d..eb818f6b9519 100644 ---- a/fs/open.c -+++ b/fs/open.c -@@ -65,6 +65,7 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs, - inode_unlock(dentry->d_inode); - return ret; - } -+EXPORT_SYMBOL_GPL(do_truncate); - - long vfs_truncate(const struct path *path, loff_t length) - { -diff --git a/fs/read_write.c b/fs/read_write.c -index 35ab54e0a994..9da238d64ea4 100644 ---- a/fs/read_write.c -+++ b/fs/read_write.c -@@ -468,6 +468,7 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) - - return ret; - } -+EXPORT_SYMBOL_GPL(vfs_read); - - static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) - { -@@ -508,6 +509,7 @@ vfs_readf_t vfs_readf(struct file *file) - return new_sync_read; - return ERR_PTR(-ENOSYS); - } -+EXPORT_SYMBOL_GPL(vfs_readf); - - vfs_writef_t vfs_writef(struct file *file) - { -@@ -519,6 +521,7 @@ vfs_writef_t vfs_writef(struct file *file) - return new_sync_write; - return ERR_PTR(-ENOSYS); - } -+EXPORT_SYMBOL_GPL(vfs_writef); - - ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos) - { -@@ -588,6 +591,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_ - - return ret; - } -+EXPORT_SYMBOL_GPL(vfs_write); - - /* file_ppos returns &file->f_pos or NULL if file is stream */ - static inline loff_t *file_ppos(struct file *file) -diff --git a/fs/splice.c b/fs/splice.c -index 58d2692c5f30..4fe4afa7f6b1 100644 ---- a/fs/splice.c -+++ b/fs/splice.c -@@ -847,6 +847,7 @@ long do_splice_from(struct pipe_inode_info *pipe, struct file *out, - - return splice_write(pipe, out, ppos, len, flags); - } -+EXPORT_SYMBOL_GPL(do_splice_from); - - /* - * Attempt to initiate a splice from a file to a pipe. -@@ -876,6 +877,7 @@ long do_splice_to(struct file *in, loff_t *ppos, - - return splice_read(in, ppos, pipe, len, flags); - } -+EXPORT_SYMBOL_GPL(do_splice_to); - - /** - * splice_direct_to_actor - splices data directly between two non-pipes -diff --git a/fs/sync.c b/fs/sync.c -index 457f4e4a5cc1..67c66358f3fe 100644 ---- a/fs/sync.c -+++ b/fs/sync.c -@@ -39,6 +39,7 @@ int __sync_filesystem(struct super_block *sb, int wait) - sb->s_op->sync_fs(sb, wait); - return __sync_blockdev(sb->s_bdev, wait); - } -+EXPORT_SYMBOL_GPL(__sync_filesystem); - - /* - * Write out and wait upon all dirty data associated with this -diff --git a/fs/xattr.c b/fs/xattr.c -index 90dd78f0eb27..40b01dd1b14a 100644 ---- a/fs/xattr.c -+++ b/fs/xattr.c -@@ -296,6 +296,7 @@ vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value, - *xattr_value = value; - return error; - } -+EXPORT_SYMBOL_GPL(vfs_getxattr_alloc); - - ssize_t - __vfs_getxattr(struct dentry *dentry, struct inode *inode, const char *name, -diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c -index 3c35a1059890..67dccde036a2 100644 ---- a/kernel/locking/lockdep.c -+++ b/kernel/locking/lockdep.c -@@ -163,6 +163,7 @@ inline struct lock_class *lockdep_hlock_class(struct held_lock *hlock) - } - return lock_classes + hlock->class_idx - 1; - } -+EXPORT_SYMBOL_GPL(lockdep_hlock_class); - #define hlock_class(hlock) lockdep_hlock_class(hlock) - - #ifdef CONFIG_LOCK_STAT -diff --git a/kernel/task_work.c b/kernel/task_work.c -index 0fef395662a6..83fb1ecfc33d 100644 ---- a/kernel/task_work.c -+++ b/kernel/task_work.c -@@ -116,3 +116,4 @@ void task_work_run(void) - } while (work); - } - } -+EXPORT_SYMBOL_GPL(task_work_run); -diff --git a/security/device_cgroup.c b/security/device_cgroup.c -index dc28914fa72e..c2ddfea2b280 100644 ---- a/security/device_cgroup.c -+++ b/security/device_cgroup.c -@@ -824,3 +824,4 @@ int __devcgroup_check_permission(short type, u32 major, u32 minor, - - return 0; - } -+EXPORT_SYMBOL_GPL(__devcgroup_check_permission); -diff --git a/security/security.c b/security/security.c -index f493db0bf62a..96f118be469f 100644 ---- a/security/security.c -+++ b/security/security.c -@@ -993,6 +993,7 @@ int security_path_rmdir(const struct path *dir, struct dentry *dentry) - return 0; - return call_int_hook(path_rmdir, 0, dir, dentry); - } -+EXPORT_SYMBOL_GPL(security_path_rmdir); - - int security_path_unlink(const struct path *dir, struct dentry *dentry) - { -@@ -1009,6 +1010,7 @@ int security_path_symlink(const struct path *dir, struct dentry *dentry, - return 0; - return call_int_hook(path_symlink, 0, dir, dentry, old_name); - } -+EXPORT_SYMBOL_GPL(security_path_symlink); - - int security_path_link(struct dentry *old_dentry, const struct path *new_dir, - struct dentry *new_dentry) -@@ -1017,6 +1019,7 @@ int security_path_link(struct dentry *old_dentry, const struct path *new_dir, - return 0; - return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry); - } -+EXPORT_SYMBOL_GPL(security_path_link); - - int security_path_rename(const struct path *old_dir, struct dentry *old_dentry, - const struct path *new_dir, struct dentry *new_dentry, -@@ -1044,6 +1047,7 @@ int security_path_truncate(const struct path *path) - return 0; - return call_int_hook(path_truncate, 0, path); - } -+EXPORT_SYMBOL_GPL(security_path_truncate); - - int security_path_chmod(const struct path *path, umode_t mode) - { -@@ -1051,6 +1055,7 @@ int security_path_chmod(const struct path *path, umode_t mode) - return 0; - return call_int_hook(path_chmod, 0, path, mode); - } -+EXPORT_SYMBOL_GPL(security_path_chmod); - - int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid) - { -@@ -1058,6 +1063,7 @@ int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid) - return 0; - return call_int_hook(path_chown, 0, path, uid, gid); - } -+EXPORT_SYMBOL_GPL(security_path_chown); - - int security_path_chroot(const struct path *path) - { -@@ -1158,6 +1164,7 @@ int security_inode_permission(struct inode *inode, int mask) - return 0; - return call_int_hook(inode_permission, 0, inode, mask); - } -+EXPORT_SYMBOL_GPL(security_inode_permission); - - int security_inode_setattr(struct dentry *dentry, struct iattr *attr) - { -@@ -1335,6 +1342,7 @@ int security_file_permission(struct file *file, int mask) - - return fsnotify_perm(file, mask); - } -+EXPORT_SYMBOL_GPL(security_file_permission); - - int security_file_alloc(struct file *file) - { --- -2.19.1 - diff --git a/features/perf/perf-force-include-of-stdbool.h.patch b/features/perf/perf-force-include-of-stdbool.h.patch index 1e337632..fd18d748 100644 --- a/features/perf/perf-force-include-of-stdbool.h.patch +++ b/features/perf/perf-force-include-of-stdbool.h.patch @@ -1,4 +1,4 @@ -From 8a04f3eaba96d66a189a31a8dde0e6922a825fdb Mon Sep 17 00:00:00 2001 +From 401ba82924e3715098a2db70127fca754f4f3dc4 Mon Sep 17 00:00:00 2001 From: Bruce Ashfield <bruce.ashfield@windriver.com> Date: Thu, 19 Aug 2010 11:24:45 -0400 Subject: [PATCH] perf: force include of <stdbool.h> @@ -13,18 +13,17 @@ Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com> 1 file changed, 2 insertions(+) diff --git a/tools/perf/perf.h b/tools/perf/perf.h -index 510c65f72858..650e9a1c68c2 100644 +index 74014033df60..3031e2850000 100644 --- a/tools/perf/perf.h +++ b/tools/perf/perf.h -@@ -11,6 +11,8 @@ void test_attr__init(void); - void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu, - int fd, int group_fd, unsigned long flags); - +@@ -1,5 +1,7 @@ + /* SPDX-License-Identifier: GPL-2.0 */ + #ifndef _PERF_PERF_H +#include <stdbool.h> + - #define HAVE_ATTR_TEST - #include "perf-sys.h" + #define _PERF_PERF_H + #include <stdbool.h> -- -1.8.1.2 +2.19.1 @@ -1 +1 @@ -v5.3-rc7 +v5.4-rc3 diff --git a/patches/misc/linux-yocto-Handle-bin-awk-issues.patch b/patches/misc/linux-yocto-Handle-bin-awk-issues.patch index c9afd0c7..d95490a1 100644 --- a/patches/misc/linux-yocto-Handle-bin-awk-issues.patch +++ b/patches/misc/linux-yocto-Handle-bin-awk-issues.patch @@ -14,9 +14,7 @@ Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> arch/arm/tools/gen-mach-types | 2 +- arch/sh/tools/gen-mach-types | 2 +- arch/x86/tools/gen-insn-attr-x86.awk | 2 +- - tools/objtool/arch/x86/tools/gen-insn-attr-x86.awk | 2 +- tools/perf/arch/x86/tests/gen-insn-x86-dat.awk | 2 +- - tools/perf/util/intel-pt-decoder/gen-insn-attr-x86.awk | 2 +- .../selftests/rcutorture/formal/srcu-cbmc/modify_srcu.awk | 2 +- 7 files changed, 7 insertions(+), 7 deletions(-) mode change 100755 => 100644 tools/testing/selftests/rcutorture/formal/srcu-cbmc/modify_srcu.awk @@ -51,16 +49,6 @@ index b02a36b2c14f..9166a071484c 100644 # SPDX-License-Identifier: GPL-2.0 # gen-insn-attr-x86.awk: Instruction attribute table generator # Written by Masami Hiramatsu <mhiramat@redhat.com> -diff --git a/tools/objtool/arch/x86/tools/gen-insn-attr-x86.awk b/tools/objtool/arch/x86/tools/gen-insn-attr-x86.awk -index b02a36b2c14f..9166a071484c 100644 ---- a/tools/objtool/arch/x86/tools/gen-insn-attr-x86.awk -+++ b/tools/objtool/arch/x86/tools/gen-insn-attr-x86.awk -@@ -1,4 +1,4 @@ --#!/bin/awk -f -+#!/usr/bin/awk -f - # SPDX-License-Identifier: GPL-2.0 - # gen-insn-attr-x86.awk: Instruction attribute table generator - # Written by Masami Hiramatsu <mhiramat@redhat.com> diff --git a/tools/perf/arch/x86/tests/gen-insn-x86-dat.awk b/tools/perf/arch/x86/tests/gen-insn-x86-dat.awk index 1a29f6379bde..6285ff7158a5 100644 --- a/tools/perf/arch/x86/tests/gen-insn-x86-dat.awk @@ -71,16 +59,6 @@ index 1a29f6379bde..6285ff7158a5 100644 # SPDX-License-Identifier: GPL-2.0-only # gen-insn-x86-dat.awk: script to convert data for the insn-x86 test # Copyright (c) 2015, Intel Corporation. -diff --git a/tools/perf/util/intel-pt-decoder/gen-insn-attr-x86.awk b/tools/perf/util/intel-pt-decoder/gen-insn-attr-x86.awk -index ddd5c4c21129..d236058fc4e2 100644 ---- a/tools/perf/util/intel-pt-decoder/gen-insn-attr-x86.awk -+++ b/tools/perf/util/intel-pt-decoder/gen-insn-attr-x86.awk -@@ -1,4 +1,4 @@ --#!/bin/awk -f -+#!/usr/bin/awk -f - # SPDX-License-Identifier: GPL-2.0 - # gen-insn-attr-x86.awk: Instruction attribute table generator - # Written by Masami Hiramatsu <mhiramat@redhat.com> diff --git a/tools/testing/selftests/rcutorture/formal/srcu-cbmc/modify_srcu.awk b/tools/testing/selftests/rcutorture/formal/srcu-cbmc/modify_srcu.awk old mode 100755 new mode 100644 |