linux-kernel - [PATCH 2/9] block: permit PREFLUSH and POSTFLUSH without prepare_flush

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Date:	Sat,  3 Jul 2010 17:45:33 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	axboe@...nel.dk
Cc:	hch@...radead.org, linux-kernel@...r.kernel.org,
	fujita.tomonori@....ntt.co.jp
Subject: [PATCH 2/9] 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@....ntt.co.jp>
---
 block/blk-barrier.c |    9 ++-------
 1 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/block/blk-barrier.c b/block/blk-barrier.c
index a348242..7ce0a32 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);
 }
-- 
1.6.5

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