NVMe: Make nvme_common_command more featureful

Add prp1, prp2 and the metadata prp to the common command, since the
fields are generally used this way.
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

include/linux/nvme.h

@@ -142,6 +142,18 @@ enum nvme_opcode {
 	nvme_cmd_dsm		= 0x09,
 };
 
+struct nvme_common_command {
+	__u8			opcode;
+	__u8			flags;
+	__u16			command_id;
+	__le32			nsid;
+	__u64			rsvd2;
+	__le64			metadata;
+	__le64			prp1;
+	__le64			prp2;
+	__u32			rsvd10[6];
+};
+
 struct nvme_rw_command {
 	__u8			opcode;
 	__u8			flags;
@@ -284,14 +296,6 @@ struct nvme_delete_queue {
 	__le32			rsvd11[5];
 };
 
-struct nvme_common_command {
-	__u8			opcode;
-	__u8			flags;
-	__u16			command_id;
-	__le32			nsid;
-	__u32			rsvd2[14];
-};
-
 struct nvme_command {
 	union {
 		struct nvme_common_command common;