nvme.h: add an enum for cns values

Ported over from nvme-cli.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NGabriel Krisman Bertazi <krisman@linux.vnet.ibm.com>
Reviewed-by: NKeith Busch <keith.busch@intel.com>
Signed-off-by: NJens Axboe <axboe@fb.com>

include/linux/nvme.h

@@ -281,6 +281,16 @@ struct nvme_id_ns {
 	__u8			vs[3712];
 };
 
+enum {
+	NVME_ID_CNS_NS			= 0x00,
+	NVME_ID_CNS_CTRL		= 0x01,
+	NVME_ID_CNS_NS_ACTIVE_LIST	= 0x02,
+	NVME_ID_CNS_NS_PRESENT_LIST	= 0x10,
+	NVME_ID_CNS_NS_PRESENT		= 0x11,
+	NVME_ID_CNS_CTRL_NS_LIST	= 0x12,
+	NVME_ID_CNS_CTRL_LIST		= 0x13,
+};
+
 enum {
 	NVME_NS_FEAT_THIN	= 1 << 0,
 	NVME_NS_FLBAS_LBA_MASK	= 0xf,