nvmet: remove extra variable in identify ns

We remove the extra local variable struct nvmet_ns in
nvmet_execute_identify_ns() since req already has ns member that can be
reused, this also eliminates the explicit call to nvmet_put_namespace()
which is already present in the request completion path.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/target/admin-cmd.c

@@ -467,7 +467,6 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
 static void nvmet_execute_identify_ns(struct nvmet_req *req)
 {
 	struct nvmet_ctrl *ctrl = req->sq->ctrl;
-	struct nvmet_ns *ns;
 	struct nvme_id_ns *id;
 	u16 status = 0;
 
@@ -484,20 +483,21 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req)
 	}
 
 	/* return an all zeroed buffer if we can't find an active namespace */
-	ns = nvmet_find_namespace(ctrl, req->cmd->identify.nsid);
-	if (!ns) {
+	req->ns = nvmet_find_namespace(ctrl, req->cmd->identify.nsid);
+	if (!req->ns) {
 		status = NVME_SC_INVALID_NS;
 		goto done;
 	}
 
-	nvmet_ns_revalidate(ns);
+	nvmet_ns_revalidate(req->ns);
 
 	/*
 	 * nuse = ncap = nsze isn't always true, but we have no way to find
 	 * that out from the underlying device.
 	 */
-	id->ncap = id->nsze = cpu_to_le64(ns->size >> ns->blksize_shift);
-	switch (req->port->ana_state[ns->anagrpid]) {
+	id->ncap = id->nsze =
+		cpu_to_le64(req->ns->size >> req->ns->blksize_shift);
+	switch (req->port->ana_state[req->ns->anagrpid]) {
 	case NVME_ANA_INACCESSIBLE:
 	case NVME_ANA_PERSISTENT_LOSS:
 		break;
@@ -506,8 +506,8 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req)
 		break;
         }
 
-	if (ns->bdev)
-		nvmet_bdev_set_limits(ns->bdev, id);
+	if (req->ns->bdev)
+		nvmet_bdev_set_limits(req->ns->bdev, id);
 
 	/*
 	 * We just provide a single LBA format that matches what the
@@ -521,25 +521,24 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req)
 	 * controllers, but also with any other user of the block device.
 	 */
 	id->nmic = (1 << 0);
-	id->anagrpid = cpu_to_le32(ns->anagrpid);
+	id->anagrpid = cpu_to_le32(req->ns->anagrpid);
 
-	memcpy(&id->nguid, &ns->nguid, sizeof(id->nguid));
+	memcpy(&id->nguid, &req->ns->nguid, sizeof(id->nguid));
 
-	id->lbaf[0].ds = ns->blksize_shift;
+	id->lbaf[0].ds = req->ns->blksize_shift;
 
-	if (ctrl->pi_support && nvmet_ns_has_pi(ns)) {
+	if (ctrl->pi_support && nvmet_ns_has_pi(req->ns)) {
 		id->dpc = NVME_NS_DPC_PI_FIRST | NVME_NS_DPC_PI_LAST |
 			  NVME_NS_DPC_PI_TYPE1 | NVME_NS_DPC_PI_TYPE2 |
 			  NVME_NS_DPC_PI_TYPE3;
 		id->mc = NVME_MC_EXTENDED_LBA;
-		id->dps = ns->pi_type;
+		id->dps = req->ns->pi_type;
 		id->flbas = NVME_NS_FLBAS_META_EXT;
-		id->lbaf[0].ms = cpu_to_le16(ns->metadata_size);
+		id->lbaf[0].ms = cpu_to_le16(req->ns->metadata_size);
 	}
 
-	if (ns->readonly)
+	if (req->ns->readonly)
 		id->nsattr |= (1 << 0);
-	nvmet_put_namespace(ns);
 done:
 	if (!status)
 		status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));