diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2026-01-26 17:36:22 +0300 |
|---|---|---|
| committer | Mikulas Patocka <mpatocka@redhat.com> | 2026-01-26 17:36:22 +0300 |
| commit | 2df8b310bcfe76827fd71092f58a2493ee6590b0 (patch) | |
| tree | 2321ef73e5ce47090026551ecedd6472b83c62c4 | |
| parent | d6d0e6b9d54532264761405a1ba8ea5bd293acb1 (diff) | |
| download | linux-2df8b310bcfe76827fd71092f58a2493ee6590b0.tar.xz | |
dm: use bio_clone_blkg_association
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>
| -rw-r--r-- | drivers/md/dm.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index ea2c43cddde1..e178fe19973e 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1364,6 +1364,8 @@ 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. |