merge = rb_entry(rb, struct extent_map, rb_node);
if (rb && mergable_maps(em, merge)) {
em->len += merge->len;
- em->block_len += merge->len;
+ em->block_len += merge->block_len;
rb_erase(&merge->rb_node, &tree->map);
merge->in_tree = 0;
em->mod_len = (merge->mod_start + merge->mod_len) - em->mod_start;