diff --git a/include/linux/fs.h b/include/linux/fs.h
index 88358ca..860689f 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -87,7 +87,8 @@
 #define WRITE_SYNC	(WRITE | (1 << BIO_RW_SYNC))
 #define SWRITE_SYNC	(SWRITE | (1 << BIO_RW_SYNC))
 #define WRITE_BARRIER	(WRITE | (1 << BIO_RW_BARRIER))
-#define WRITE_DISCARD	(WRITE | (1 << BIO_RW_DISCARD))
+#define DISCARD_NOBARRIER (1 << BIO_RW_DISCARD)
+#define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (1 << BIO_RW_BARRIER))
 
 #define SEL_IN		1
 #define SEL_OUT		2