[PATCH] Btrfs: try to avoid acquiring free space ctl's lock

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

We don't need to take the lock if the block group has not been cached.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
---
 fs/btrfs/extent-tree.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index b2b0b82..6832047 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -7715,18 +7715,19 @@ static noinline int find_free_extent(struct btrfs_root *orig_root,
 			last_ptr->fragmented = 1;
 			spin_unlock(&last_ptr->lock);
 		}
-		spin_lock(&block_group->free_space_ctl->tree_lock);
-		if (cached &&
-		    block_group->free_space_ctl->free_space <
-		    num_bytes + empty_cluster + empty_size) {
-			if (block_group->free_space_ctl->free_space >
-			    max_extent_size)
-				max_extent_size =
-					block_group->free_space_ctl->free_space;
-			spin_unlock(&block_group->free_space_ctl->tree_lock);
-			goto loop;
+		if (cached) {
+			struct btrfs_free_space_ctl *ctl =
+				block_group->free_space_ctl;
+			spin_lock(&ctl->tree_lock);
+			if (ctl->free_space <
+			    num_bytes + empty_cluster + empty_size) {
+				if (ctl->free_space > max_extent_size)
+					max_extent_size = ctl->free_space;
+				spin_unlock(&ctl->tree_lock);
+				goto loop;
+			}
+			spin_unlock(&ctl->tree_lock);
 		}
-		spin_unlock(&block_group->free_space_ctl->tree_lock);
 
 		offset = btrfs_find_space_for_alloc(block_group, search_start,
 						    num_bytes, empty_size,
-- 
2.5.5