tree cd073c26cb66e6d2f8640c3aabb412ff22946b63
parent 55872c5a3c01f0fe7b5298d19e24e237f5b5ff06
author Tejun Heo <tj@kernel.org> 1410131720 +0900
committer Jens Axboe <axboe@fb.com> 1410191737 -0600

blkcg: remove blkcg->id

blkcg->id is a unique id given to each blkcg; however, the
cgroup_subsys_state which each blkcg embeds already has ->serial_nr
which can be used for the same purpose.  Drop blkcg->id and replace
its uses with blkcg->css.serial_nr.  Rename cfq_cgroup->blkcg_id to
->blkcg_serial_nr and @id in check_blkcg_changed() to @serial_nr for
consistency.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>