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blkcg: fix incorrect read/write sync/async stat accounting 

While unifying how blkcg stats are collected, 77ea733884 ("blkcg:
move io_service_bytes and io_serviced stats into blkcg_gq")
incorrectly used bio->flags instead of bio->rw to tell the IO type.
This made IOs to be accounted as the wrong type.  Fix it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: 77ea733884 ("blkcg: move io_service_bytes and io_serviced stats into blkcg_gq")
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tejun Heo 2015-10-22 09:27:12 +09:00 committed by Jens Axboe
parent 858e904bd7
commit 174fd8d369
1 changed files with 2 additions and 2 deletions
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4
include/linux/blk-cgroup.h
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@ -713,9 +713,9 @@ static inline bool blkcg_bio_issue_check(struct request_queue *q,
if (!throtl) {
blkg = blkg ?: q->root_blkg;
blkg_rwstat_add(&blkg->stat_bytes, bio->bi_flags,
blkg_rwstat_add(&blkg->stat_bytes, bio->bi_rw,
bio->bi_iter.bi_size);
blkg_rwstat_add(&blkg->stat_ios, bio->bi_flags, 1);
blkg_rwstat_add(&blkg->stat_ios, bio->bi_rw, 1);
}
rcu_read_unlock();