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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@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
majianpeng 2013-11-14 15:16:19 +11:00 committed by NeilBrown
parent c0f8bd146a
commit e59aa23f4c
1 changed files with 1 additions and 1 deletions
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2
drivers/md/raid5.c
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@ -874,7 +874,7 @@ 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;