blk_status_t nvme_setup_cmd()

in host/core.c [991:1043]

• 49 lines of code
• 15 McCabe index (conditional complexity)

blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req)
{
	struct nvme_command *cmd = nvme_req(req)->cmd;
	blk_status_t ret = BLK_STS_OK;

	if (!(req->rq_flags & RQF_DONTPREP))
		nvme_clear_nvme_request(req);

	switch (req_op(req)) {
	case REQ_OP_DRV_IN:
	case REQ_OP_DRV_OUT:
		/* these are setup prior to execution in nvme_init_request() */
		break;
	case REQ_OP_FLUSH:
		nvme_setup_flush(ns, cmd);
		break;
	case REQ_OP_ZONE_RESET_ALL:
	case REQ_OP_ZONE_RESET:
		ret = nvme_setup_zone_mgmt_send(ns, req, cmd, NVME_ZONE_RESET);
		break;
	case REQ_OP_ZONE_OPEN:
		ret = nvme_setup_zone_mgmt_send(ns, req, cmd, NVME_ZONE_OPEN);
		break;
	case REQ_OP_ZONE_CLOSE:
		ret = nvme_setup_zone_mgmt_send(ns, req, cmd, NVME_ZONE_CLOSE);
		break;
	case REQ_OP_ZONE_FINISH:
		ret = nvme_setup_zone_mgmt_send(ns, req, cmd, NVME_ZONE_FINISH);
		break;
	case REQ_OP_WRITE_ZEROES:
		ret = nvme_setup_write_zeroes(ns, req, cmd);
		break;
	case REQ_OP_DISCARD:
		ret = nvme_setup_discard(ns, req, cmd);
		break;
	case REQ_OP_READ:
		ret = nvme_setup_rw(ns, req, cmd, nvme_cmd_read);
		break;
	case REQ_OP_WRITE:
		ret = nvme_setup_rw(ns, req, cmd, nvme_cmd_write);
		break;
	case REQ_OP_ZONE_APPEND:
		ret = nvme_setup_rw(ns, req, cmd, nvme_cmd_zone_append);
		break;
	default:
		WARN_ON_ONCE(1);
		return BLK_STS_IOERR;
	}

	cmd->common.command_id = nvme_cid(req);
	trace_nvme_setup_cmd(req, cmd);
	return ret;
}