blk-mq: export setting request completion state
This is preparing for drivers that want to directly alter the state of their requests. No functional change here. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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2 changed files with 15 additions and 3 deletions
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@ -558,10 +558,8 @@ static void __blk_mq_complete_request(struct request *rq)
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bool shared = false;
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int cpu;
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if (cmpxchg(&rq->state, MQ_RQ_IN_FLIGHT, MQ_RQ_COMPLETE) !=
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MQ_RQ_IN_FLIGHT)
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if (!blk_mq_mark_complete(rq))
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return;
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if (rq->internal_tag != -1)
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blk_mq_sched_completed_request(rq);
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@ -287,6 +287,20 @@ void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
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void blk_mq_quiesce_queue_nowait(struct request_queue *q);
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/**
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* blk_mq_mark_complete() - Set request state to complete
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* @rq: request to set to complete state
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*
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* Returns true if request state was successfully set to complete. If
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* successful, the caller is responsibile for seeing this request is ended, as
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* blk_mq_complete_request will not work again.
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*/
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static inline bool blk_mq_mark_complete(struct request *rq)
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{
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return cmpxchg(&rq->state, MQ_RQ_IN_FLIGHT, MQ_RQ_COMPLETE) ==
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MQ_RQ_IN_FLIGHT;
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}
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/*
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* Driver command data is immediately after the request. So subtract request
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* size to get back to the original request, add request size to get the PDU.
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