Btrfs: fix missed transaction->aborted check (2cba30f1) · Commits · 戴 / test

First, though the current transaction->aborted check can stop the commit early and avoid unnecessary operations, it is too early, and some transaction handles don't end, those handles may set transaction->aborted after the check. Second, when we commit the transaction, we will wake up some worker threads to flush the space cache and inode cache. Those threads also allocate some transaction handles and may set transaction->aborted if some serious error happens. So we need more check for ->aborted when committing the transaction. Fix it. Signed-off-by:

Miao Xie <miaox@cn.fujitsu.com> Signed-off-by:

Josef Bacik <jbacik@fusionio.com>

fs/btrfs/transaction.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -1575,6 +1575,11 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
		wait_event(cur_trans->writer_wait,
		atomic_read(&cur_trans->num_writers) == 1);

		/* ->aborted might be set after the previous check, so check it */
		if (unlikely(ACCESS_ONCE(cur_trans->aborted))) {
		ret = cur_trans->aborted;
		goto cleanup_transaction;
		}
		/*
		* the reloc mutex makes sure that we stop
		* the balancing code from coming in and moving
		@@ -1658,6 +1663,17 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
		goto cleanup_transaction;
		}

		/*
		* The tasks which save the space cache and inode cache may also
		* update ->aborted, check it.
		*/
		if (unlikely(ACCESS_ONCE(cur_trans->aborted))) {
		ret = cur_trans->aborted;
		mutex_unlock(&root->fs_info->tree_log_mutex);
		mutex_unlock(&root->fs_info->reloc_mutex);
		goto cleanup_transaction;
		}

		btrfs_prepare_extent_commit(trans, root);

		cur_trans = root->fs_info->running_transaction;

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