[PATCH v2 1/2] nvmet: return Invalid Field for invalid NSIDs in Set Features 82h

[Guixin Liu <kanie@linux.alibaba.com>]

The Reservation Notification Mask feature (FID 82h) defines its own
status code for namespaces that do not support reservations:

  "If a Set Features command or a Get Features command attempts to
  access the Reservation Notification Mask on a namespace that does
  not support reservations or is invalid, then that command is
  aborted with status code of Invalid Field in Command."

  -- NVMe Base Specification, section 5.2.26.1.33

The Set Features handler routes the namespace lookup through
nvmet_req_find_ns(), which returns Invalid Namespace or Format for an
unknown NSID.  That is the correct status for the generic
namespace-scoped admin commands, but not for this feature: a Set
Features 82h naming a nonexistent NSID is aborted with Invalid
Namespace or Format instead of Invalid Field in Command.

Translate the lookup failure to Invalid Field in Command.  The
broadcast NSID, the namespace-without-reservations case and everything
else keep their current behavior.

Fixes: 5a47c2080a73 ("nvmet: support reservation feature")
Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
---
 drivers/nvme/target/pr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/target/pr.c b/drivers/nvme/target/pr.c
index 0948a690a1c0..a36c732883d4 100644
--- a/drivers/nvme/target/pr.c
+++ b/drivers/nvme/target/pr.c
@@ -51,6 +51,8 @@ u16 nvmet_set_feat_resv_notif_mask(struct nvmet_req *req, u32 mask)
 
 	if (nsid != U32_MAX) {
 		status = nvmet_req_find_ns(req);
+		if (status == (NVME_SC_INVALID_NS | NVME_STATUS_DNR))
+			return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
 		if (status)
 			return status;
 		if (!req->ns->pr.enable)
-- 
2.43.7