diff --git a/include/linux/virtio_blk.h b/include/linux/virtio_blk.h
index e0edb40..e2aba15 100644
--- a/include/linux/virtio_blk.h
+++ b/include/linux/virtio_blk.h
@@ -37,8 +37,9 @@
 #define VIRTIO_BLK_F_RO		5	/* Disk is read-only */
 #define VIRTIO_BLK_F_BLK_SIZE	6	/* Block size of disk is available*/
 #define VIRTIO_BLK_F_SCSI	7	/* Supports scsi command passthru */
-#define VIRTIO_BLK_F_FLUSH	9	/* Cache flush command support */
+#define VIRTIO_BLK_F_WCE	9	/* Writeback mode enabled after reset */
 #define VIRTIO_BLK_F_TOPOLOGY	10	/* Topology information is available */
+#define VIRTIO_BLK_F_CONFIG_WCE	11	/* Writeback mode available in config */
 
 #define VIRTIO_BLK_ID_BYTES	20	/* ID string length */
 
@@ -69,6 +70,8 @@
 	/* optimal sustained I/O size in logical blocks. */
 	__u32 opt_io_size;
 
+	/* writeback mode (if VIRTIO_BLK_F_CONFIG_WCE) */
+	__u8 wce;
 } __attribute__((packed));
 
 /*