From: Mikulas Patocka <mpatocka@redhat.com> mainline inclusion from mainline-v7.0-rc1 commit 2df8b310bcfe76827fd71092f58a2493ee6590b0 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/13467 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- The origin bio carries blk-cgroup information which could be set from foreground(task_css(css) - wbc->wb->blkcg_css), so the blkcg won't control buffer io since commit ca522482e3eaf ("dm: pass NULL bdev to bio_alloc_clone"). The synchronous io is still under control by blkcg, because 'bio->bi_blkg' is set by io submitting task which has been added into 'cgroup.procs'. Fix it by using bio_clone_blkg_association when submitting a cloned bio. Link: https://bugzilla.kernel.org/show_bug.cgi?id=220985 Fixes: ca522482e3eaf ("dm: pass NULL bdev to bio_alloc_clone") Reported-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Tested-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> --- drivers/md/dm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 96f050891ec0..670460ade280 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1365,6 +1365,8 @@ void dm_submit_bio_remap(struct bio *clone, struct bio *tgt_clone) if (!tgt_clone) tgt_clone = clone; + bio_clone_blkg_association(tgt_clone, io->orig_bio); + /* * Account io->origin_bio to DM dev on behalf of target * that took ownership of IO with DM_MAPIO_SUBMITTED. -- 2.52.0