MD: make bio mergeable
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 <qkrwngud825@gmail.com> Fixes: 6ac45aeb6bca(block: avoid to merge splitted bio) Cc: stable@vger.kernel.org (v4.3+) Cc: Ming Lei <ming.lei@canonical.com> Cc: Neil Brown <neilb@suse.de> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
parent
b297874a2d
commit
9c573de328
|
@ -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();
|
||||
|
|
Loading…
Reference in a new issue