tree 1e3c7ab62c68cd37e81a13f46bceba374c5ea5ae
parent af551fb3be26a22b7a6b345b3b7e7e6acfc41758
author Shaohua Li <shli@fb.com> 1505422926 -0700
committer Jens Axboe <axboe@kernel.dk> 1506433282 -0600

block: make blkcg aware of kthread stored original cgroup info

bio_blkcg is the only API to get cgroup info for a bio right now. If
bio_blkcg finds current task is a kthread and has original blkcg
associated, it will use the css instead of associating the bio to
current task. This makes it possible that kthread dispatches bios on
behalf of other threads.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>