blk-mq: Export freeze/unfreeze functions
Let drivers prevent entering a queue that isn't available. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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@ -107,7 +107,7 @@ static void blk_mq_usage_counter_release(struct percpu_ref *ref)
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wake_up_all(&q->mq_freeze_wq);
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}
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static void blk_mq_freeze_queue_start(struct request_queue *q)
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void blk_mq_freeze_queue_start(struct request_queue *q)
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{
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bool freeze;
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@ -120,6 +120,7 @@ static void blk_mq_freeze_queue_start(struct request_queue *q)
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blk_mq_run_queues(q, false);
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}
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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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{
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@ -136,7 +137,7 @@ void blk_mq_freeze_queue(struct request_queue *q)
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blk_mq_freeze_queue_wait(q);
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}
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static void blk_mq_unfreeze_queue(struct request_queue *q)
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void blk_mq_unfreeze_queue(struct request_queue *q)
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{
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bool wake;
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@ -149,6 +150,7 @@ static void blk_mq_unfreeze_queue(struct request_queue *q)
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wake_up_all(&q->mq_freeze_wq);
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}
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}
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EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue);
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bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx)
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{
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@ -212,6 +212,8 @@ void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
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void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
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void blk_mq_tag_busy_iter(struct blk_mq_hw_ctx *hctx, busy_iter_fn *fn,
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void *priv);
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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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/*
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* Driver command data is immediately after the request. So subtract request
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