blk_map_iter_next
} while (blk_map_iter_next(req, &iter->iter, vec));
if (!blk_map_iter_next(req, &iter->iter, &vec))
if (!blk_map_iter_next(req, &iter->iter, &vec))
while (blk_map_iter_next(rq, &iter, &vec)) {
if (!blk_map_iter_next(req, &iter->iter, &vec))
while (blk_map_iter_next(rq, &iter, &vec)) {