diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 7158c97..a924274 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1659,6 +1659,10 @@
 	spinlock_t reada_lock;
 	struct radix_tree_root reada_tree;
 
+	/* Extent buffer radix tree */
+	spinlock_t buffer_lock;
+	struct radix_tree_root buffer_radix;
+
 	/* next backup root to be overwritten */
 	int backup_root_index;