diff options
Diffstat (limited to 'features/aufs/aufs6-mmap.patch')
| -rw-r--r-- | features/aufs/aufs6-mmap.patch | 450 |
1 files changed, 450 insertions, 0 deletions
diff --git a/features/aufs/aufs6-mmap.patch b/features/aufs/aufs6-mmap.patch new file mode 100644 index 00000000..d1e5168f --- /dev/null +++ b/features/aufs/aufs6-mmap.patch @@ -0,0 +1,450 @@ +From 550fbd6a226ed0b04b497dd4dcf5e14c7cd113f1 Mon Sep 17 00:00:00 2001 +From: Bruce Ashfield <bruce.ashfield@gmail.com> +Date: Thu, 21 Sep 2023 17:49:39 -0400 +Subject: [PATCH] aufs6: mmap + +Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> +--- + fs/proc/base.c | 2 +- + fs/proc/nommu.c | 5 ++- + fs/proc/task_mmu.c | 6 ++- + fs/proc/task_nommu.c | 5 ++- + include/linux/mm.h | 37 +++++++++++++++++ + include/linux/mm_types.h | 6 +++ + kernel/fork.c | 2 +- + mm/Makefile | 1 + + mm/filemap.c | 2 +- + mm/mmap.c | 41 +++++++++++++++---- + mm/nommu.c | 10 ++--- + mm/prfile.c | 86 ++++++++++++++++++++++++++++++++++++++++ + 12 files changed, 184 insertions(+), 19 deletions(-) + create mode 100644 mm/prfile.c + +diff --git a/fs/proc/base.c b/fs/proc/base.c +index 98a031ac2648..9cd1d25f9fc0 100644 +--- a/fs/proc/base.c ++++ b/fs/proc/base.c +@@ -2215,7 +2215,7 @@ 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 = *file_user_path(vma->vm_file); ++ *path = *file_user_path(vma_pr_or_file(vma)); + path_get(path); + rc = 0; + } +diff --git a/fs/proc/nommu.c b/fs/proc/nommu.c +index c6e7ebc63756..d7ccfd909764 100644 +--- a/fs/proc/nommu.c ++++ b/fs/proc/nommu.c +@@ -39,7 +39,10 @@ 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 3f78ebbb795f..32f9aaf5345e 100644 +--- a/fs/proc/task_mmu.c ++++ b/fs/proc/task_mmu.c +@@ -273,8 +273,10 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma) + const char *name = NULL; + + if (file) { +- const struct inode *inode = file_user_inode(vma->vm_file); ++ struct inode *inode; + ++ file = vma_pr_or_file(vma); ++ inode = file_user_inode(vma->vm_file); + dev = inode->i_sb->s_dev; + ino = inode->i_ino; + pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; +@@ -2701,7 +2703,7 @@ 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; + char buffer[64]; + struct mempolicy *pol; +diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c +index bce674533000..b12b5a75c799 100644 +--- a/fs/proc/task_nommu.c ++++ b/fs/proc/task_nommu.c +@@ -137,7 +137,10 @@ 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 f5a97dec5169..dc908f541ce9 100644 +--- a/include/linux/mm.h ++++ b/include/linux/mm.h +@@ -2432,6 +2432,43 @@ static inline void unmap_shared_mapping_range(struct address_space *mapping, + static inline struct vm_area_struct *vma_lookup(struct mm_struct *mm, + unsigned long addr); + ++#if 1 /* IS_ENABLED(CONFIG_AUFS_FS) */ ++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 */ ++ ++#else ++ ++#define vma_file_update_time(vma) file_update_time((vma)->vm_file) ++#define vma_pr_or_file(vma) (vma)->vm_file ++#define vma_get_file(vma) get_file((vma)->vm_file) ++#define vma_fput(vma) fput((vma)->vm_file) ++ ++#ifndef CONFIG_MMU ++#define vmr_pr_or_file(region) (region)->vm_file ++#define vmr_fput(region) fput((region)->vm_file) ++#endif /* !CONFIG_MMU */ ++ ++#endif /* CONFIG_AUFS_FS */ ++ + 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 8b611e13153e..f5f10bfa5b63 100644 +--- a/include/linux/mm_types.h ++++ b/include/linux/mm_types.h +@@ -527,6 +527,9 @@ 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 */ ++#if 1 /* IS_ENABLED(CONFIG_AUFS_FS) */ ++ struct file *vm_prfile; /* the virtual backing file or NULL */ ++#endif + + int vm_usage; /* region usage count (access under nommu_region_sem) */ + bool vm_icache_flushed : 1; /* true if the icache has been flushed for +@@ -691,6 +694,9 @@ 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). */ ++#if 1 /* IS_ENABLED(CONFIG_AUFS_FS) */ ++ struct file *vm_prfile; /* shadow of vm_file */ ++#endif + void * vm_private_data; /* was vm_pte (shared mem) */ + + #ifdef CONFIG_ANON_VMA_NAME +diff --git a/kernel/fork.c b/kernel/fork.c +index 47ff3b35352e..41a80f248514 100644 +--- a/kernel/fork.c ++++ b/kernel/fork.c +@@ -716,7 +716,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, + if (file) { + struct address_space *mapping = file->f_mapping; + +- get_file(file); ++ vma_get_file(tmp); + i_mmap_lock_write(mapping); + if (vma_is_shared_maywrite(tmp)) + mapping_allow_writable(mapping); +diff --git a/mm/Makefile b/mm/Makefile +index e4b5b75aaec9..d69ba9efb769 100644 +--- a/mm/Makefile ++++ b/mm/Makefile +@@ -134,3 +134,4 @@ obj-$(CONFIG_IO_MAPPING) += io-mapping.o + obj-$(CONFIG_HAVE_BOOTMEM_INFO_NODE) += bootmem_info.o + obj-$(CONFIG_GENERIC_IOREMAP) += ioremap.o + obj-$(CONFIG_SHRINKER_DEBUG) += shrinker_debug.o ++obj-y += prfile.o +diff --git a/mm/filemap.c b/mm/filemap.c +index 750e779c23db..b84a752ff676 100644 +--- a/mm/filemap.c ++++ b/mm/filemap.c +@@ -3587,7 +3587,7 @@ vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf) + vm_fault_t ret = VM_FAULT_LOCKED; + + sb_start_pagefault(mapping->host->i_sb); +- file_update_time(vmf->vma->vm_file); ++ vma_file_update_time(vmf->vma); + folio_lock(folio); + if (folio->mapping != mapping) { + folio_unlock(folio); +diff --git a/mm/mmap.c b/mm/mmap.c +index b78e83d351d2..e2ae3999a51c 100644 +--- a/mm/mmap.c ++++ b/mm/mmap.c +@@ -140,7 +140,7 @@ static void remove_vma(struct vm_area_struct *vma, bool unreachable) + 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)); + if (unreachable) + __vm_area_free(vma); +@@ -554,7 +554,7 @@ static inline void vma_complete(struct vma_prepare *vp, + if (vp->file) { + uprobe_munmap(vp->remove, vp->remove->vm_start, + vp->remove->vm_end); +- fput(vp->file); ++ vma_fput(vp->vma); + } + if (vp->remove->anon_vma) + anon_vma_merge(vp->vma, vp->remove); +@@ -2355,7 +2355,7 @@ static int __split_vma(struct vma_iterator *vmi, 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); +@@ -2853,7 +2853,7 @@ unsigned long mmap_region(struct file *file, unsigned long addr, + * and cause general protection fault + * ultimately. + */ +- fput(vma->vm_file); ++ vma_fput(vma); + vm_area_free(vma); + vma = merge; + /* Update vm_flags to pick up the change. */ +@@ -2948,7 +2948,7 @@ unsigned long mmap_region(struct file *file, unsigned long addr, + + if (file || vma->vm_file) { + unmap_and_free_vma: +- fput(vma->vm_file); ++ vma_fput(vma); + vma->vm_file = NULL; + + vma_iter_set(&vmi, vma->vm_end); +@@ -3010,6 +3010,9 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, + unsigned long populate = 0; + unsigned long ret = -EINVAL; + struct file *file; ++#if 1 /* IS_ENABLED(CONFIG_AUFS_FS) */ ++ struct file *prfile; ++#endif + + pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. See Documentation/mm/remap_file_pages.rst.\n", + current->comm, current->pid); +@@ -3068,10 +3071,34 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, + if (vma->vm_flags & VM_LOCKED) + flags |= MAP_LOCKED; + ++#if 1 /* IS_ENABLED(CONFIG_AUFS_FS) */ ++ vma_get_file(vma); ++ file = vma->vm_file; ++ prfile = vma->vm_prfile; ++ ret = do_mmap(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 (prfile) ++ get_file(prfile); ++ } ++ /* ++ * two fput()s instead of vma_fput(vma), ++ * coz vma may not be available anymore. ++ */ ++ fput(file); ++ if (prfile) ++ fput(prfile); ++#else + file = get_file(vma->vm_file); + ret = do_mmap(vma->vm_file, start, size, + prot, flags, 0, pgoff, &populate, NULL); + fput(file); ++#endif /* CONFIG_AUFS_FS */ + out: + mmap_write_unlock(mm); + if (populate) +@@ -3418,7 +3445,7 @@ 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); + if (vma_link(mm, new_vma)) +@@ -3432,7 +3459,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap, + new_vma->vm_ops->close(new_vma); + + if (new_vma->vm_file) +- fput(new_vma->vm_file); ++ vma_fput(new_vma); + + unlink_anon_vmas(new_vma); + out_free_mempol: +diff --git a/mm/nommu.c b/mm/nommu.c +index b6dc558d3144..d96655486468 100644 +--- a/mm/nommu.c ++++ b/mm/nommu.c +@@ -523,7 +523,7 @@ 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 */ +@@ -603,7 +603,7 @@ 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); + } +@@ -1135,7 +1135,7 @@ 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; +@@ -1221,10 +1221,10 @@ unsigned long do_mmap(struct file *file, + error: + vma_iter_free(&vmi); + 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..8f820a235364 +--- /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) 2014-2022 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 */ +-- +2.39.2 + |