btrfs: reada: reduce additional fs_info->reada_lock in reada_find_zone
We can avoid additional locking-acquirment and one pair of
kref_get/put by combine two condition.
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index 49b3fb7..7448080 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -260,18 +260,14 @@
spin_lock(&fs_info->reada_lock);
ret = radix_tree_gang_lookup(&dev->reada_zones, (void **)&zone,
logical >> PAGE_CACHE_SHIFT, 1);
- if (ret == 1)
+ if (ret == 1 && logical >= zone->start && logical <= zone->end) {
kref_get(&zone->refcnt);
- spin_unlock(&fs_info->reada_lock);
-
- if (ret == 1) {
- if (logical >= zone->start && logical <= zone->end)
- return zone;
- spin_lock(&fs_info->reada_lock);
- kref_put(&zone->refcnt, reada_zone_release);
spin_unlock(&fs_info->reada_lock);
+ return zone;
}
+ spin_unlock(&fs_info->reada_lock);
+
cache = btrfs_lookup_block_group(fs_info, logical);
if (!cache)
return NULL;