space_reftree_add_seg
space_reftree_add_seg(t, rs_get_start(rs, rt), rs_get_end(rs,
void space_reftree_add_seg(avl_tree_t *t, uint64_t start, uint64_t end,
space_reftree_add_seg(&reftree, 0, scrub_txg, -1);