1 files changed, 286 insertions, 0 deletions
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);
+}