[PATCH 4/4] nvmet: set right status on error in id-ns handler

[Chaitanya Kulkarni]

The function nvmet_execute_identify_ns() does't set the status
if call to nvmet_find_namespace() fails. In that case we set the
status of the request to the value return by the nvmet_copy_sgl().

Set the status to NVME_SC_INVALID_NS and adjust the code such that
request will have the right status on nvmet_find_namespace() failure.

Without this patch :-
# nvme id-ns /dev/nvme1 -n 3
NVME Identify Namespace 3:
nsze    : 0
ncap    : 0
nuse    : 0
nsfeat  : 0
nlbaf   : 0
flbas   : 0
mc      : 0
dpc     : 0
dps     : 0
nmic    : 0
rescap  : 0
fpi     : 0
dlfeat  : 0
nawun   : 0
nawupf  : 0
nacwu   : 0
nabsn   : 0
nabo    : 0
nabspf  : 0
noiob   : 0
nvmcap  : 0
mssrl   : 0
mcl     : 0
msrc    : 0
nsattr	: 0
nvmsetid: 0
anagrpid: 0
endgid  : 0
nguid   : 00000000000000000000000000000000
eui64   : 0000000000000000
lbaf  0 : ms:0   lbads:0  rp:0 (in use)

With this patch-series :-
	
# gitlog -4 
3fd4a1736f35 (HEAD -> nvme-5.11) nvmet: set right status on error in id-ns handler
4d8a9ebec05e nvmet: remove extra variable in id-desclist
de9e611ac167 nvmet: remove extra variable in identify ns
54165b5c1ca3 nvmet: remove extra variable in smart log nsid
# nvme id-ns /dev/nvme1 -n 3
NVMe status: INVALID_NS: The namespace or the format of that namespace is invalid(0xb)

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
---
 drivers/nvme/target/admin-cmd.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 29438ecfecae..74620240ac47 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -485,8 +485,10 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req)
 
 	/* return an all zeroed buffer if we can't find an active namespace */
 	req->ns = nvmet_find_namespace(ctrl, req->cmd->identify.nsid);
-	if (!req->ns)
+	if (!req->ns) {
+		status = NVME_SC_INVALID_NS;
 		goto done;
+	}
 
 	nvmet_ns_revalidate(req->ns);
 
@@ -539,7 +541,11 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req)
 	if (req->ns->readonly)
 		id->nsattr |= (1 << 0);
 done:
-	status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
+	if (nvmet_copy_to_sgl(req, 0, id, sizeof(*id))) {
+		if (!status)
+			status = NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
+	}
+
 	kfree(id);
 out:
 	nvmet_req_complete(req, status);
-- 
2.22.1