[PATCH V4 3/9] nvmet: trim down id-desclist to use req->ns

[Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>]

In this prep patch we remove the extra local variable struct nvmet_ns
in nvmet_execute_identify_desclist() since req already has the member
that can be reused, this also eliminates the explicit call to
nvmet_put_namespace() which is already present in the request
completion path.

This reduces the arguments to the function in the following patch to
implement the ZNS for bdev-ns so we can get away with passing the req
argument instead of req and ns.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>
---
 drivers/nvme/target/admin-cmd.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 509fd8dcca0c..c64b40c631e0 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -603,37 +603,35 @@ u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len,
 
 static void nvmet_execute_identify_desclist(struct nvmet_req *req)
 {
-	struct nvmet_ns *ns;
 	u16 status = 0;
 	off_t off = 0;
 
-	ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
-	if (!ns) {
+	req->ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
+	if (!req->ns) {
 		req->error_loc = offsetof(struct nvme_identify, nsid);
 		status = NVME_SC_INVALID_NS | NVME_SC_DNR;
 		goto out;
 	}
 
-	if (memchr_inv(&ns->uuid, 0, sizeof(ns->uuid))) {
+	if (memchr_inv(&req->ns->uuid, 0, sizeof(req->ns->uuid))) {
 		status = nvmet_copy_ns_identifier(req, NVME_NIDT_UUID,
 						  NVME_NIDT_UUID_LEN,
-						  &ns->uuid, &off);
+						  &req->ns->uuid, &off);
 		if (status)
-			goto out_put_ns;
+			goto out;
 	}
-	if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid))) {
+	if (memchr_inv(req->ns->nguid, 0, sizeof(req->ns->nguid))) {
 		status = nvmet_copy_ns_identifier(req, NVME_NIDT_NGUID,
 						  NVME_NIDT_NGUID_LEN,
-						  &ns->nguid, &off);
+						  &req->ns->nguid, &off);
 		if (status)
-			goto out_put_ns;
+			goto out;
 	}
 
 	if (sg_zero_buffer(req->sg, req->sg_cnt, NVME_IDENTIFY_DATA_SIZE - off,
 			off) != NVME_IDENTIFY_DATA_SIZE - off)
 		status = NVME_SC_INTERNAL | NVME_SC_DNR;
-out_put_ns:
-	nvmet_put_namespace(ns);
+
 out:
 	nvmet_req_complete(req, status);
 }
-- 
2.22.1