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btrfs: use btrfs_record_snapshot_destroy() during rmdir

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We are setting the parent directory's last_unlink_trans directly which
may result in a concurrent task starting to log the directory not see the
update and therefore can log the directory after we removed a child
directory which had a snapshot within instead of falling back to a
transaction commit. Replaying such a log tree would result in a mount
failure since we can't currently delete snapshots (and subvolumes) during
log replay. This is the type of failure described in commit 1ec9a1ae1e
("Btrfs: fix unreplayable log after snapshot delete + parent dir fsync").

Fix this by using btrfs_record_snapshot_destroy() which updates the
last_unlink_trans field while holding the inode's log_mutex lock.

Fixes: 44f714dae5 ("Btrfs: improve performance on fsync against new inode after rename/unlink")
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2025-06-20 16:37:01 +01:00 committed by David Sterba
parent c466e33e72
commit 157501b046
1 changed files with 1 additions and 1 deletions
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fs/btrfs/inode.c
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@ -4750,7 +4750,7 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
* deletes for directory foo. * deletes for directory foo.
*/ */
if (BTRFS_I(inode)->last_unlink_trans >= trans->transid) if (BTRFS_I(inode)->last_unlink_trans >= trans->transid)
BTRFS_I(dir)->last_unlink_trans = BTRFS_I(inode)->last_unlink_trans; btrfs_record_snapshot_destroy(trans, BTRFS_I(dir));
if (unlikely(btrfs_ino(BTRFS_I(inode)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { if (unlikely(btrfs_ino(BTRFS_I(inode)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
ret = btrfs_unlink_subvol(trans, BTRFS_I(dir), dentry); ret = btrfs_unlink_subvol(trans, BTRFS_I(dir), dentry);