blk-mq: Export blk_mq_freeze_queue_wait
Drivers can start a freeze, so this provides a way to wait for frozen. Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
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@ -75,10 +75,11 @@ void blk_mq_freeze_queue_start(struct request_queue *q)
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}
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EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_start);
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static void blk_mq_freeze_queue_wait(struct request_queue *q)
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void blk_mq_freeze_queue_wait(struct request_queue *q)
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{
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wait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->q_usage_counter));
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}
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EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_wait);
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/*
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* Guarantee no request is in use, so we can change any data structure of
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@ -245,6 +245,7 @@ void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
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void blk_mq_freeze_queue(struct request_queue *q);
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void blk_mq_unfreeze_queue(struct request_queue *q);
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void blk_mq_freeze_queue_start(struct request_queue *q);
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void blk_mq_freeze_queue_wait(struct request_queue *q);
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int blk_mq_reinit_tagset(struct blk_mq_tag_set *set);
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int blk_mq_map_queues(struct blk_mq_tag_set *set);
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