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ocfs2: Avoid touching renamed directory if parent does not change 

The VFS will not be locking moved directory if its parent does not
change. Change ocfs2 rename code to avoid touching renamed directory if
its parent does not change as without locking that can corrupt the
filesystem.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Jan Kara 2023-10-12 23:14:21 +02:00 committed by Al Viro
parent 49db9b1b86
commit 9d618d19b2
1 changed files with 5 additions and 3 deletions
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8
fs/ocfs2/namei.c
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@ -1336,7 +1336,7 @@ static int ocfs2_rename(struct mnt_idmap *idmap,
goto bail;
}
if (S_ISDIR(old_inode->i_mode)) {
if (S_ISDIR(old_inode->i_mode) && new_dir != old_dir) {
u64 old_inode_parent;
update_dot_dot = 1;
@ -1353,8 +1353,7 @@ static int ocfs2_rename(struct mnt_idmap *idmap,
goto bail;
}
if (!new_inode && new_dir != old_dir &&
new_dir->i_nlink >= ocfs2_link_max(osb)) {
if (!new_inode && new_dir->i_nlink >= ocfs2_link_max(osb)) {
status = -EMLINK;
goto bail;
}
@ -1601,6 +1600,9 @@ static int ocfs2_rename(struct mnt_idmap *idmap,
mlog_errno(status);
goto bail;
}
}
if (S_ISDIR(old_inode->i_mode)) {
drop_nlink(old_dir);
if (new_inode) {
drop_nlink(new_inode);