NVME_REQ_USERCMD
if (rq->q == ctrl->admin_q && (req->flags & NVME_REQ_USERCMD))
nvme_req(req)->flags |= NVME_REQ_USERCMD;
(entries == 1 && !(nvme_req(req)->flags & NVME_REQ_USERCMD))) {
nvme_req(req)->flags & NVME_REQ_USERCMD;
nvme_req(req)->flags & NVME_REQ_USERCMD ||