[PATCH v4 2/2] nvme: identify-namespace without CAP_SYS_ADMIN

[Kanchan Joshi]

Allow all identify-namespace variants (CNS 00h, 05h and 08h) without
requiring CAP_SYS_ADMIN. The information (retrieved using id-ns) is
needed to form IO commands for passthrough interface.

Signed-off-by: Kanchan Joshi <joshi.k at samsung.com>
Reviewed-by: Keith Busch <kbusch at kernel.org>
Reviewed-by: Jens Axboe <axboe at kernel.dk>
---
 drivers/nvme/host/ioctl.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index 9c581b1a8956..4b11e247063e 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -15,9 +15,17 @@ bool nvme_cmd_allowed(struct nvme_ns *ns, struct nvme_command *c, fmode_t mode)
 	if (capable(CAP_SYS_ADMIN))
 		return true;
 
-	/* admin commands are not allowed */
-	if (!ns)
+	if (!ns) {
+		if (opcode == nvme_admin_identify) {
+			switch (c->identify.cns) {
+			case NVME_ID_CNS_NS:
+			case NVME_ID_CNS_CS_NS:
+			case NVME_ID_CNS_NS_CS_INDEP:
+				return true;
+			}
+		}
 		return false;
+	}
 
 	/* exclude vendor-specific io and fabrics commands */
 	if (opcode >= nvme_cmd_vendor_start || opcode == nvme_fabrics_command)
-- 
2.25.1