[PATCH] AS barrier bug

There's a bug in AS, it sets HARDBARRIER on a request when it should be
setting it as a softbarrier. IO scheduler has no business using that
bit, if it needs to put barriers there they should be soft. Hard
barriers involve hardware operations.

drivers/block/as-iosched.c

@@ -1249,7 +1249,7 @@ static int as_dispatch_request(struct as_data *ad)
 			ad->changed_batch = 0;
 		} else
 			ad->changed_batch = 2;
-		arq->request->flags |= REQ_HARDBARRIER;
+		arq->request->flags |= REQ_SOFTBARRIER;
 	}
 
 	/*