extend vlist code to allow keeping the old data structure instead of the new one on updates

1 files changed, 5 insertions, 0 deletions

diff --git a/utils.c b/utils.c
index 42d3176..a67a8c9 100644
--- a/utils.c
+++ b/utils.c
@@ -37,11 +37,16 @@ vlist_add(struct vlist_tree *tree, struct vlist_node *node)
 
 	anode = avl_find(&tree->avl, key);
 	if (anode) {
+		if (tree->keep_old)
+			goto update_only;
+
 		old_node = container_of(anode, struct vlist_node, avl);
 		avl_delete(&tree->avl, anode);
 	}
 
 	avl_insert(&tree->avl, &node->avl);
+
+update_only:
 	tree->update(tree, node, old_node);
 }