Fix up comments about matching flags between bio and rq

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/bio.h b/include/linux/bio.h
index dbeb66f813ab..17f1fbdb31bf 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -150,8 +150,8 @@ struct bio {
  * bit 3 -- fail fast, don't want low level driver retries
  * bit 4 -- synchronous I/O hint: the block layer will unplug immediately
  */
-#define BIO_RW          0
-#define BIO_RW_AHEAD    1
+#define BIO_RW          0       /* Must match RW in req flags (blkdev.h) */
+#define BIO_RW_AHEAD    1       /* Must match FAILFAST in req flags */
 #define BIO_RW_BARRIER  2
 #define BIO_RW_FAILFAST 3
 #define BIO_RW_SYNC     4