From bef24514648fa5028cca25de43e773c685905627 Mon Sep 17 00:00:00 2001
From: Alex Bligh <alex@alex.org.uk>
Date: Tue, 17 May 2011 12:02:37 +0100
Subject: [PATCH 1/1] move NBD_FLAGS from cliserv.h to nbd.h as they will be
 used in the kernel when we have the ioctl. Add
 NBD_CMD_FLUSH.

---
 cliserv.h |    4 ----
 nbd.h     |   14 +++++++++++++-
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/cliserv.h b/cliserv.h
index 51c8bd1..b32626f 100644
--- a/cliserv.h
+++ b/cliserv.h
@@ -132,10 +132,6 @@ u64 ntohll(u64 a) {
 #endif
 #define htonll ntohll
 
-/* Flags used between the client and server */
-#define NBD_FLAG_HAS_FLAGS	(1 << 0)	/* Flags are there */
-#define NBD_FLAG_READ_ONLY	(1 << 1)	/* Device is read-only */
-
 #define NBD_DEFAULT_PORT	"10809"	/* Port on which named exports are
 					 * served */
 
diff --git a/nbd.h b/nbd.h
index 451f50c..875c215 100644
--- a/nbd.h
+++ b/nbd.h
@@ -27,13 +27,25 @@
 #define NBD_SET_SIZE_BLOCKS	_IO( 0xab, 7 )
 #define NBD_DISCONNECT  _IO( 0xab, 8 )
 #define NBD_SET_TIMEOUT _IO( 0xab, 9 )
+#define NBD_SET_FLAGS _IO( 0xab, 10 )
 
 enum {
 	NBD_CMD_READ = 0,
 	NBD_CMD_WRITE = 1,
-	NBD_CMD_DISC = 2
+	NBD_CMD_DISC = 2,
+	NBD_CMD_FLUSH = 3
 };
 
+#define NBD_CMD_MASK_COMMAND 0x0000ffff
+#define NBD_CMD_FLAG_FUA (1<<16)
+
+/* values for flags field */
+#define NBD_FLAG_HAS_FLAGS	(1 << 0)	/* Flags are there */
+#define NBD_FLAG_READ_ONLY	(1 << 1)	/* Device is read-only */
+#define NBD_FLAG_SEND_FLUSH	(1 << 2)	/* Send FLUSH */
+#define NBD_FLAG_SEND_FUA	(1 << 3)	/* Send FUA (Force Unit Access) */
+#define NBD_FLAG_ROTATIONAL	(1 << 4)	/* Use elevator algorithm - rotational media */
+
 #define nbd_cmd(req) ((req)->cmd[0])
 
 /* userspace doesn't need the nbd_device structure */
-- 
1.7.10.4