Commit 93f5bea7 authored by Li Nan's avatar Li Nan
Browse files

dm: switch to precise io accounting 

hulk inclusion
category: bugfix
bugzilla: 188421, https://gitee.com/openeuler/kernel/issues/I7WMMI


CVE: NA

--------------------------------

'ios' and 'sectors' is counted in bio_start_io_acct() while io is
started insted of io is done. Hence switch to precise io accounting to
count them when io is done.

Signed-off-by: default avatarLi Nan <linan122@huawei.com>
parent 5a9bf845

drivers/md/dm.c

+2 −2
Original line number Diff line number Diff line
@@ -587,7 +587,7 @@ static void start_io_acct(struct dm_io *io) 
	struct mapped_device *md = io->md;

	struct bio *bio = io->orig_bio;



	io->start_time = bio_start_io_acct(bio);

	io->start_time = bio_start_precise_io_acct(bio);

	if (unlikely(dm_stats_used(&md->stats)))

		dm_stats_account_io(&md->stats, bio_data_dir(bio),

				    bio->bi_iter.bi_sector, bio_sectors(bio),
@@ -606,7 +606,7 @@ static void end_io_acct(struct mapped_device *md, struct bio *bio, 


	smp_wmb();



	bio_end_io_acct(bio, start_time);

	bio_end_precise_io_acct(bio, start_time);



	/* nudge anyone waiting on suspend queue */

	if (unlikely(wq_has_sleeper(&md->wait)))