tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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>

Mikulas Patocka 2df8b310 d6d0e6b9

+2
+2
drivers/md/dm.c
··· 1364 1364 if (!tgt_clone) 1365 1365 tgt_clone = clone; 1366 1366 1367 + bio_clone_blkg_association(tgt_clone, io->orig_bio); 1368 + 1367 1369 /* 1368 1370 * Account io->origin_bio to DM dev on behalf of target 1369 1371 * that took ownership of IO with DM_MAPIO_SUBMITTED.