blk-stat: export helpers for modifying blk_rq_stat
We need to use blk_rq_stat in the blkcg qos stuff, so export some of these helpers so they can be used by other things. Signed-off-by: Josef Bacik <jbacik@fb.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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