1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/crush/crush.h b/include/linux/crush/crush.h
index 158a4d25ca83..7c4750811b96 100644
--- a/include/linux/crush/crush.h
+++ b/include/linux/crush/crush.h
@@ -166,4 +166,9 @@ extern void crush_destroy_bucket_straw(struct crush_bucket_straw *b);
 extern void crush_destroy_bucket(struct crush_bucket *b);
 extern void crush_destroy(struct crush_map *map);
 
+static inline int crush_calc_tree_node(int i)
+{
+        return ((i+1) << 1)-1;
+}
+
 #endif