block/fs/drivers: remove rw argument from submit_bio

This has callers of submit_bio/submit_bio_wait set the bio->bi_rw
instead of passing it in. This makes that use the same as
generic_make_request and how we set the other bio fields.

Signed-off-by: Mike Christie <mchristi@redhat.com>

Fixed up fs/ext4/crypto.c

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fs/buffer.c b/fs/buffer.c
index 754813a..9a55e7f 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3030,8 +3030,9 @@
 		rw |= REQ_META;
 	if (buffer_prio(bh))
 		rw |= REQ_PRIO;
+	bio->bi_rw = rw;
 
-	submit_bio(rw, bio);
+	submit_bio(bio);
 	return 0;
 }