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-rw-r--r--include/linux/crush/crush.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/crush/crush.h b/include/linux/crush/crush.h
index 3f50369a50e8..e7a8c9055cb2 100644
--- a/include/linux/crush/crush.h
+++ b/include/linux/crush/crush.h
@@ -177,4 +177,9 @@ 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