We don't need to take the lock if the block group has not been cached.
Signed-off-by: Liu Bo <bo.li....@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
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