[PATCH 6.4 746/800] ext4: Remove ext4 locking of moved directory

Greg Kroah-Hartman
2023-07-16T20:27:46Z

From: Jan Kara <jack@suse.cz>

commit 3658840cd363f2be094f5dfd2f0b174a9055dd0f upstream.

Remove locking of moved directory in ext4_rename2(). We will take care
of it in VFS instead. This effectively reverts commit 0813299c586b
("ext4: Fix possible corruption when moving a directory") and followup
fixes.

CC: Ted Tso <tytso@mit.edu>
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20230601105830.13168-1-jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/ext4/namei.c | 17 ++---------------
1 file changed, 2 insertions(+), 15 deletions(-)

--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3834,19 +3834,10 @@ static int ext4_rename(struct mnt_idmap
return retval;
}

- /*
- * We need to protect against old.inode directory getting converted
- * from inline directory format into a normal one.
- */
- if (S_ISDIR(old.inode->i_mode))
- inode_lock_nested(old.inode, I_MUTEX_NONDIR2);
-
old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de,
&old.inlined);
- if (IS_ERR(old.bh)) {
- retval = PTR_ERR(old.bh);
- goto unlock_moved_dir;
- }
+ if (IS_ERR(old.bh))
+ return PTR_ERR(old.bh);

/*
* Check for inode number is _not_ due to possible IO errors.
@@ -4043,10 +4034,6 @@ release_bh:
brelse(old.bh);
brelse(new.bh);

-unlock_moved_dir:
- if (S_ISDIR(old.inode->i_mode))
- inode_unlock(old.inode);
-
return retval;
}