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

While unifying how blkcg stats are collected, 77ea733884eb ("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: 77ea733884eb ("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>

diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index 0a5cc7a1109b9b2c655020c6c849960506f1cbc6..c02e669945e9279bceb796eb9a1adb938ebf863b 100644 (file)
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -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();