If we failed to add new entry on rename whiteout, we cannot reset the
old->de entry directly, because the old->de could have moved from under
us during make indexed dir. So find the old entry again before reset is
needed, otherwise it may corrupt the filesystem as below.
/dev/sda: Entry '00000001' in ??? (12) has deleted/unused inode 15. CLEARED.
/dev/sda: Unattached inode 75
/dev/sda: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.
Fixes: 6b4b8e6b4ad ("ext4: fix bug for rename with RENAME_WHITEOUT")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: zhangyi (F) <yi.zhang@xxxxxxxxxx>
---
fs/ext4/namei.c | 29 +++++++++++++++++++++++++++--
1 file changed, 27 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index cf652ba3e74d..17d9400563fa 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3602,6 +3602,31 @@ static int ext4_setent(handle_t *handle, struct ext4_renament *ent,
return retval;
}
+static void ext4_resetent(handle_t *handle, struct ext4_renament *ent,
+ unsigned ino, unsigned file_type)
+{
+ struct ext4_renament old = *ent;
+ int retval = 0;
+
+ /*
+ * old->de could have moved from under us during make indexed dir,
+ * so the old->de may no longer valid and need to find it again
+ * before reset old inode info.
+ */
+ old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL);
+ if (IS_ERR(old.bh))
+ retval = PTR_ERR(old.bh);
+ if (!old.bh)
+ retval = -ENOENT;
+ if (retval) {
+ ext4_std_error(old.dir->i_sb, retval);
+ return;
+ }
+
+ ext4_setent(handle, &old, ino, file_type);
+ brelse(old.bh);
+}
+
static int ext4_find_delete_entry(handle_t *handle, struct inode *dir,
const struct qstr *d_name)
{
@@ -3924,8 +3949,8 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
end_rename:
if (whiteout) {
if (retval) {
- ext4_setent(handle, &old,
- old.inode->i_ino, old_file_type);
+ ext4_resetent(handle, &old,
+ old.inode->i_ino, old_file_type);
drop_nlink(whiteout);
}
unlock_new_inode(whiteout);
--
2.25.4
