[PATCH v7 1/3] ublk: add opcode offsets for DRV_IN/DRV_OUT

[Andreas Hindborg <nmi@metaspace.dk>]

From: Andreas Hindborg <a.hindborg@samsung.com>

Ublk zoned storage support relies on DRV_IN handling for zone report.
Prepare for this change by adding offsets for the DRV_IN/DRV_OUT commands.

Suggested-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Andreas Hindborg <a.hindborg@samsung.com>
---
 include/uapi/linux/ublk_cmd.h | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/include/uapi/linux/ublk_cmd.h b/include/uapi/linux/ublk_cmd.h
index 4b8558db90e1..521a0d2fbc06 100644
--- a/include/uapi/linux/ublk_cmd.h
+++ b/include/uapi/linux/ublk_cmd.h
@@ -229,12 +229,23 @@ struct ublksrv_ctrl_dev_info {
 	__u64   reserved2;
 };
 
-#define		UBLK_IO_OP_READ		0
+#define		UBLK_IO_OP_READ			0
 #define		UBLK_IO_OP_WRITE		1
 #define		UBLK_IO_OP_FLUSH		2
-#define		UBLK_IO_OP_DISCARD	3
-#define		UBLK_IO_OP_WRITE_SAME	4
-#define		UBLK_IO_OP_WRITE_ZEROES	5
+#define		UBLK_IO_OP_DISCARD		3
+#define		UBLK_IO_OP_WRITE_SAME		4
+#define		UBLK_IO_OP_WRITE_ZEROES		5
+/*
+ * Ublk passthrough operation code ranges, and each passthrough operation
+ * provides generic interface between ublk kernel driver and ublk userspace, and
+ * this interface is usually used for handling generic block layer request, such
+ * as command of zoned report zones. Passthrough operation is only needed iff
+ * ublk kernel driver has to be involved for handling this operation.
+ */
+#define		__UBLK_IO_OP_DRV_IN_START	32
+#define		__UBLK_IO_OP_DRV_IN_END		96
+#define		__UBLK_IO_OP_DRV_OUT_START	__UBLK_IO_OP_DRV_IN_END
+#define		__UBLK_IO_OP_DRV_OUT_END	160
 
 #define		UBLK_IO_F_FAILFAST_DEV		(1U << 8)
 #define		UBLK_IO_F_FAILFAST_TRANSPORT	(1U << 9)
-- 
2.41.0