[PATCH] Btrfs: avoid deadlock in btrfs_async_run_delayed_root

[Liu Bo <bo.li.liu@oracle.com>]

Here %path is set with ->leave_spinning=1, thus it'll hold the rwlock
after btrfs_search_slot(), however, when processing delayed items in
__btrfs_commit_inode_delayed_items(), it goes to acquire node->mutex
which might sleep, that is, it may sleep under spin_lock.

Given node->mutex is necessary to avoid race between async works, this
remove the ->leave_spining setting.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
---
 fs/btrfs/delayed-inode.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index 19e4ad2..a857a2f 100644
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -1331,7 +1331,6 @@ static void btrfs_async_run_delayed_root(struct btrfs_work *work)
 	if (!delayed_node)
 		goto free_path;
 
-	path->leave_spinning = 1;
 	root = delayed_node->root;
 
 	trans = btrfs_join_transaction(root);
-- 
2.9.4