X-Git-Url: http://git.alex.org.uk

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 */