linux-ext4 - [PATCH v2 1/6] ext4: Remove ext4 locking of moved directory

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Message-Id: <20230601105830.13168-1-jack@suse.cz>
Date:   Thu,  1 Jun 2023 12:58:21 +0200
From:   Jan Kara <jack@...e.cz>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     <linux-fsdevel@...r.kernel.org>,
        Christian Brauner <brauner@...nel.org>,
        Miklos Szeredi <miklos@...redi.hu>,
        "Darrick J. Wong" <djwong@...nel.org>, Ted Tso <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>, <linux-ext4@...r.kernel.org>,
        <linux-xfs@...r.kernel.org>,
        linux-f2fs-devel@...ts.sourceforge.net, Jan Kara <jack@...e.cz>,
        stable@...r.kernel.org
Subject: [PATCH v2 1/6] ext4: Remove ext4 locking of moved directory

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@....edu>
CC: stable@...r.kernel.org
Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/namei.c | 17 ++---------------
 1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 45b579805c95..0caf6c730ce3 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3834,19 +3834,10 @@ static int ext4_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 			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 @@ static int ext4_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 	brelse(old.bh);
 	brelse(new.bh);
 
-unlock_moved_dir:
-	if (S_ISDIR(old.inode->i_mode))
-		inode_unlock(old.inode);
-
 	return retval;
 }
 
-- 
2.35.3