nvme_identify_ns
ret = nvme_identify_ns(ctrl, info->nsid, &id);
ret = nvme_identify_ns(ns->ctrl, info->nsid, &id);
int nvme_identify_ns(struct nvme_ctrl *ctrl, unsigned nsid,
ret = nvme_identify_ns(ns->ctrl, head->ns_id, &id);
ret = nvme_identify_ns(ns->ctrl, ns->head->ns_id, &id);