[PATCHv4 09/13] nvmet: implement csi identify ns

[Keith Busch <kbusch@meta.com>]

From: Keith Busch <kbusch@kernel.org>

Implements reporting the I/O Command Set Independent Identify Namespace
command.

Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 drivers/nvme/target/admin-cmd.c | 32 ++++++++++++++++++++++++++++++++
 include/linux/nvme.h            |  1 +
 2 files changed, 33 insertions(+)

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 6d3a1d2103bf3..516af7b419189 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -893,6 +893,35 @@ static void nvme_execute_identify_ns_nvm(struct nvmet_req *req)
 	nvmet_req_complete(req, status);
 }
 
+static void nvmet_execute_id_cs_indep(struct nvmet_req *req)
+{
+	struct nvme_id_ns_cs_indep *id;
+	u16 status;
+
+	status = nvmet_req_find_ns(req);
+	if (status)
+		goto out;
+
+	id = kzalloc(sizeof(*id), GFP_KERNEL);
+	if (!id) {
+		status = NVME_SC_INTERNAL;
+		goto out;
+	}
+
+	id->nstat = NVME_NSTAT_NRDY;
+	id->anagrpid = req->ns->anagrpid;
+	id->nmic = NVME_NS_NMIC_SHARED;
+	if (req->ns->readonly)
+		id->nsattr |= NVME_NS_ATTR_RO;
+	if (req->ns->bdev && !bdev_nonrot(req->ns->bdev))
+		id->nsfeat |= NVME_NS_ROTATIONAL;
+
+	status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
+	kfree(id);
+out:
+	nvmet_req_complete(req, status);
+}
+
 static void nvmet_execute_identify(struct nvmet_req *req)
 {
 	if (!nvmet_check_transfer_len(req, NVME_IDENTIFY_DATA_SIZE))
@@ -940,6 +969,9 @@ static void nvmet_execute_identify(struct nvmet_req *req)
 	case NVME_ID_CNS_NS_ACTIVE_LIST_CS:
 		nvmet_execute_identify_nslist(req, true);
 		return;
+	case NVME_ID_CNS_NS_CS_INDEP:
+		nvmet_execute_id_cs_indep(req);
+		return;
 	case NVME_ID_CNS_ENDGRP_LIST:
 		nvmet_execute_identify_endgrp_list(req);
 		return;
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 93a0abfab5b0e..22375c87591a2 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -563,6 +563,7 @@ enum {
 	NVME_NS_FLBAS_LBA_SHIFT	= 1,
 	NVME_NS_FLBAS_META_EXT	= 0x10,
 	NVME_NS_NMIC_SHARED	= 1 << 0,
+	NVME_NS_ROTATIONAL	= 1 << 4,
 	NVME_LBAF_RP_BEST	= 0,
 	NVME_LBAF_RP_BETTER	= 1,
 	NVME_LBAF_RP_GOOD	= 2,
-- 
2.43.5