blkio: Take care of cgroup deletion and cfq group reference counting
o One can choose to change elevator or delete a cgroup. Implement group reference counting so that both elevator exit and cgroup deletion can take place gracefully. Signed-off-by: NVivek Goyal <vgoyal@redhat.com> Signed-off-by: NNauman Rafique <nauman@google.com> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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