block: permit PREFLUSH and POSTFLUSH without prepare_flush_fn

This is preparation for removing q->prepare_flush_fn.

Temporarily, blk_queue_ordered() permits QUEUE_ORDERED_DO_PREFLUSH and
QUEUE_ORDERED_DO_POSTFLUSH without prepare_flush_fn.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 2 insertions, 7 deletions

diff --git a/block/blk-barrier.c b/block/blk-barrier.c
index a3482425c507..7ce0a32a21fd 100644
--- a/block/blk-barrier.c
+++ b/block/blk-barrier.c
@@ -25,12 +25,6 @@
 int blk_queue_ordered(struct request_queue *q, unsigned ordered,
                       prepare_flush_fn *prepare_flush_fn)
 {
-        if (!prepare_flush_fn && (ordered & (QUEUE_ORDERED_DO_PREFLUSH |
-                                             QUEUE_ORDERED_DO_POSTFLUSH))) {
-                printk(KERN_ERR "%s: prepare_flush_fn required\n", __func__);
-                return -EINVAL;
-        }
-
         if (ordered != QUEUE_ORDERED_NONE &&
             ordered != QUEUE_ORDERED_DRAIN &&
             ordered != QUEUE_ORDERED_DRAIN_FLUSH &&
@@ -146,7 +140,8 @@ static void queue_flush(struct request_queue *q, unsigned which)
         rq->cmd_flags = REQ_HARDBARRIER | REQ_FLUSH;
         rq->rq_disk = q->bar_rq.rq_disk;
         rq->end_io = end_io;
-        q->prepare_flush_fn(q, rq);
+        if (q->prepare_flush_fn)
+                q->prepare_flush_fn(q, rq);
 
         elv_insert(q, rq, ELEVATOR_INSERT_FRONT);
 }