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-rw-r--r--include/uapi/linux/nbd.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/uapi/linux/nbd.h b/include/uapi/linux/nbd.h
index dfb5144..4f52549 100644
--- a/include/uapi/linux/nbd.h
+++ b/include/uapi/linux/nbd.h
@@ -33,13 +33,14 @@ enum {
NBD_CMD_READ = 0,
NBD_CMD_WRITE = 1,
NBD_CMD_DISC = 2,
- /* there is a gap here to match userspace */
+ NBD_CMD_FLUSH = 3,
NBD_CMD_TRIM = 4
};
/* values for flags field */
#define NBD_FLAG_HAS_FLAGS (1 << 0) /* nbd-server supports flags */
#define NBD_FLAG_READ_ONLY (1 << 1) /* device is read-only */
+#define NBD_FLAG_SEND_FLUSH (1 << 2) /* can flush writeback cache */
/* there is a gap here to match userspace */
#define NBD_FLAG_SEND_TRIM (1 << 5) /* send trim/discard */
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