Merge tag 'for-6.14-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:

 - add lockdep annotation for relocation root to fix a splat warning
   while merging roots

 - fix assertion failure when splitting ordered extent after transaction
   abort

 - don't print 'qgroup inconsistent' message when rescan process updates
   qgroup data sooner than the subvolume deletion process

 - fix use-after-free (accessing the error number) when attempting to
   join an aborted transaction

 - avoid starting new transaction if not necessary when cleaning qgroup
   during subvolume drop

* tag 'for-6.14-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: avoid starting new transaction when cleaning qgroup during subvolume drop
  btrfs: fix use-after-free when attempting to join an aborted transaction
  btrfs: do not output error message if a qgroup has been already cleaned up
  btrfs: fix assertion failure when splitting ordered extent after transaction abort
  btrfs: fix lockdep splat while merging a relocation root

Author: torvalds

fs/btrfs/ctree.c

@@ -1496,6 +1496,7 @@ read_block_for_search(struct btrfs_root *root, struct btrfs_path *p,
 
 		if (!p->skip_locking) {
 			btrfs_unlock_up_safe(p, parent_level + 1);
+			btrfs_maybe_reset_lockdep_class(root, tmp);
 			tmp_locked = true;
 			btrfs_tree_read_lock(tmp);
 			btrfs_release_path(p);
@@ -1539,6 +1540,7 @@ read_block_for_search(struct btrfs_root *root, struct btrfs_path *p,
 
 	if (!p->skip_locking) {
 		ASSERT(ret == -EAGAIN);
+		btrfs_maybe_reset_lockdep_class(root, tmp);
 		tmp_locked = true;
 		btrfs_tree_read_lock(tmp);
 		btrfs_release_path(p);

fs/btrfs/ordered-data.c

@@ -1229,6 +1229,18 @@ struct btrfs_ordered_extent *btrfs_split_ordered_extent(
 	 */
 	if (WARN_ON_ONCE(len >= ordered->num_bytes))
 		return ERR_PTR(-EINVAL);
+	/*
+	 * If our ordered extent had an error there's no point in continuing.
+	 * The error may have come from a transaction abort done either by this
+	 * task or some other concurrent task, and the transaction abort path
+	 * iterates over all existing ordered extents and sets the flag
+	 * BTRFS_ORDERED_IOERR on them.
+	 */
+	if (unlikely(flags & (1U << BTRFS_ORDERED_IOERR))) {
+		const int fs_error = BTRFS_FS_ERROR(fs_info);
+
+		return fs_error ? ERR_PTR(fs_error) : ERR_PTR(-EIO);
+	}
 	/* We cannot split partially completed ordered extents. */
 	if (ordered->bytes_left) {
 		ASSERT(!(flags & ~BTRFS_ORDERED_TYPE_FLAGS));

fs/btrfs/qgroup.c

@@ -1880,11 +1880,7 @@ int btrfs_qgroup_cleanup_dropped_subvolume(struct btrfs_fs_info *fs_info, u64 su
 	 * Commit current transaction to make sure all the rfer/excl numbers
 	 * get updated.
 	 */
-	trans = btrfs_start_transaction(fs_info->quota_root, 0);
-	if (IS_ERR(trans))
-		return PTR_ERR(trans);
-
-	ret = btrfs_commit_transaction(trans);
+	ret = btrfs_commit_current_transaction(fs_info->quota_root);
 	if (ret < 0)
 		return ret;
 
@@ -1897,8 +1893,11 @@ int btrfs_qgroup_cleanup_dropped_subvolume(struct btrfs_fs_info *fs_info, u64 su
 	/*
 	 * It's squota and the subvolume still has numbers needed for future
 	 * accounting, in this case we can not delete it.  Just skip it.
+	 *
+	 * Or the qgroup is already removed by a qgroup rescan. For both cases we're
+	 * safe to ignore them.
 	 */
-	if (ret == -EBUSY)
+	if (ret == -EBUSY || ret == -ENOENT)
 		ret = 0;
 	return ret;
 }

fs/btrfs/transaction.c

@@ -274,8 +274,10 @@ static noinline int join_transaction(struct btrfs_fs_info *fs_info,
 	cur_trans = fs_info->running_transaction;
 	if (cur_trans) {
 		if (TRANS_ABORTED(cur_trans)) {
+			const int abort_error = cur_trans->aborted;
+
 			spin_unlock(&fs_info->trans_lock);
-			return cur_trans->aborted;
+			return abort_error;
 		}
 		if (btrfs_blocked_trans_types[cur_trans->state] & type) {
 			spin_unlock(&fs_info->trans_lock);