linux-kernel - [PATCH 3/3] md/raid5: For stripe with R5_ReadNoMerge, we replace REQ_FLUSH with REQ

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Date:	Wed, 30 Oct 2013 10:41:46 +0800
From:	majianpeng <majianpeng@...il.com>
To:	axboe <axboe@...nel.dk>, NeilBrown <neilb@...e.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-raid <linux-raid@...r.kernel.org>
Subject: [PATCH 3/3] md/raid5: For stripe with R5_ReadNoMerge, we replace REQ_FLUSH with REQ_NOMERGE.

For R5_ReadNoMerge,it mean this bio can't merge with other bios or
request.It used REQ_FLUSH to achieve this. But REQ_NOMERGE can do the
same work.

Signed-off-by: Jianpeng Ma <majianpeng@...il.com>
---
 drivers/md/raid5.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index f8b9068..8e0aeaa 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -772,7 +772,7 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
 				bi->bi_sector = (sh->sector
 						 + rdev->data_offset);
 			if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags))
-				bi->bi_rw |= REQ_FLUSH;
+				bi->bi_rw |= REQ_NOMERGE;
 
 			bi->bi_vcnt = 1;
 			bi->bi_io_vec[0].bv_len = STRIPE_SIZE;
-- 
1.8.4