Unverified Commit 760a57c6 authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!5517 dm: revert partial fix for redundant bio-based IO accounting 

Merge Pull Request from: @ci-robot 
 
PR sync from: Li Nan <linan122@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/W7SXMMS2BRTF3CO5J4QJKCQ77SAQTWB5/ 
 
https://gitee.com/openeuler/kernel/issues/I9BD67 
 
Link:https://gitee.com/openeuler/kernel/pulls/5517

 

Reviewed-by: default avatarYu Kuai <yukuai3@huawei.com>
Reviewed-by: default avatarLiu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: default avatarZhang Changzhong <zhangchangzhong@huawei.com>
parents 95316ac2 3830dbee

drivers/md/dm.c

+0 −14
Original line number Diff line number Diff line
@@ -1638,8 +1638,6 @@ static void init_clone_info(struct clone_info *ci, struct mapped_device *md, 
	ci->sector = bio->bi_iter.bi_sector;

}



#define __dm_part_stat_sub(part, field, subnd) \

	(part_stat_get(part, field) -= (subnd))

/*

 * Entry point to split a bio into clones and submit them to the targets.

 */
@@ -1689,18 +1687,6 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md, 
							  GFP_NOIO, &md->queue->bio_split);

				ci.io->orig_bio = b;



				/*

				 * Adjust IO stats for each split, otherwise upon queue

				 * reentry there will be redundant IO accounting.

				 * NOTE: this is a stop-gap fix, a proper fix involves

				 * significant refactoring of DM core's bio splitting

				 * (by eliminating DM's splitting and just using bio_split)

				 */

				part_stat_lock();

				__dm_part_stat_sub(&dm_disk(md)->part0,

						sectors[op_stat_group(bio_op(bio))], ci.sector_count);

				part_stat_unlock();



				bio_chain(b, bio);

				ret = generic_make_request(bio);

				break;