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MD: make bio mergeable

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blk_queue_split marks bio unmergeable, which makes sense for normal bio.
But if dispatching the bio to underlayer disk, the blk_queue_split
checks are invalid, hence it's possible the bio becomes mergeable.

In the reported bug, this bug causes trim against raid0 performance slash
https://bugzilla.kernel.org/show_bug.cgi?id=117051

Reported-and-tested-by: Park Ju Hyung <[email protected]>
Fixes: 6ac45aeb6bca(block: avoid to merge splitted bio)
Cc: [email protected] (v4.3+)
Cc: Ming Lei <[email protected]>
Cc: Neil Brown <[email protected]>
Reviewed-by: Jens Axboe <[email protected]>
Signed-off-by: Shaohua Li <[email protected]>
This commit is contained in:
Shaohua Li 2016-04-25 16:52:38 -07:00
commit 9c573de328
1 changed files with 2 additions and 0 deletions
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2
drivers/md/md.c
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@ -284,6 +284,8 @@ static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
* go away inside make_request
*/
sectors = bio_sectors(bio);
/* bio could be mergeable after passing to underlayer */
bio->bi_rw &= ~REQ_NOMERGE;
mddev->pers->make_request(mddev, bio);
cpu = part_stat_lock();