diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 26ececb..727886d 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -81,6 +81,7 @@
 	 */
 	REQ_LB_OP_EJECT	= 0x40,		/* eject request */
 	REQ_LB_OP_FLUSH = 0x41,		/* flush device */
+	REQ_LB_OP_DISCARD = 0x42,	/* discard sectors */
 };
 
 /*