From: majianpeng <majianpeng@gmail.com>
To: axboe <axboe@kernel.dk>, NeilBrown <neilb@suse.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
linux-raid <linux-raid@vger.kernel.org>
Subject: [PATCH 3/3] md/raid5: For stripe with R5_ReadNoMerge, we replace REQ_FLUSH with REQ_NOMERGE.
Date: Wed, 30 Oct 2013 10:41:46 +0800 [thread overview]
Message-ID: <2013103010414134402615@gmail.com> (raw)
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@gmail.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
next reply other threads:[~2013-10-30 2:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-30 2:41 majianpeng [this message]
2013-10-31 3:10 ` [PATCH 3/3] md/raid5: For stripe with R5_ReadNoMerge, we replace REQ_FLUSH with REQ_NOMERGE NeilBrown
2013-10-31 5:24 ` kedacomkernel
2013-10-31 14:10 ` axboe
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