crush: fix tree node weight lookup

Fix the node weight lookup for tree buckets by using a correct accessor.

Reflects ceph.git commit d287ade5bcbdca82a3aef145b92924cf1e856733.

Reviewed-by: Alex Elder <elder@inktank.com>
Signed-off-by: Sage Weil <sage@inktank.com>

diff --git a/include/linux/crush/crush.h b/include/linux/crush/crush.h
index 158a4d25ca83f2f36dec50ba69e845f433385676..7c4750811b966e7d865484c2cf7020199c628164 100644 (file)
--- 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

diff --git a/net/ceph/crush/crush.c b/net/ceph/crush/crush.c
index 2160791acf03e6207dd909f3742efbb0757e3219..b93575f4eb13bcee249f0c9df9c9247a9a7905ff 100644 (file)
--- a/net/ceph/crush/crush.c
+++ b/net/ceph/crush/crush.c
@@ -37,9 +37,7 @@ int crush_get_bucket_item_weight(const struct crush_bucket *b, int p)
        case CRUSH_BUCKET_LIST:
                return ((struct crush_bucket_list *)b)->item_weights[p];
        case CRUSH_BUCKET_TREE:
-               if (p & 1)
-                       return ((struct crush_bucket_tree *)b)->node_weights[p];
-               return 0;
+               return ((struct crush_bucket_tree *)b)->node_weights[crush_calc_tree_node(p)];
        case CRUSH_BUCKET_STRAW:
                return ((struct crush_bucket_straw *)b)->item_weights[p];
        }