1 files changed, 1 insertions, 0 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 117090995e7c..caa860a1c3e5 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -544,6 +544,7 @@ struct btrfs_space_info {
         /* for block groups in our same type */
         struct list_head block_groups;
         spinlock_t lock;
+        struct rw_semaphore groups_sem;
 };
 
 struct btrfs_free_space {