Commit b4c6a028 authored by Keith Busch's avatar Keith Busch Committed by Jens Axboe
Browse files

blk-mq: Export freeze/unfreeze functions 



Let drivers prevent entering a queue that isn't available.

Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent c76541a9

block/blk-mq.c

+4 −2
Original line number Diff line number Diff line
@@ -107,7 +107,7 @@ static void blk_mq_usage_counter_release(struct percpu_ref *ref) 
	wake_up_all(&q->mq_freeze_wq);

}



static void blk_mq_freeze_queue_start(struct request_queue *q)

void blk_mq_freeze_queue_start(struct request_queue *q)

{

	bool freeze;
@@ -120,6 +120,7 @@ static void blk_mq_freeze_queue_start(struct request_queue *q) 
		blk_mq_run_queues(q, false);

	}

}

EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_start);



static void blk_mq_freeze_queue_wait(struct request_queue *q)

{
@@ -136,7 +137,7 @@ void blk_mq_freeze_queue(struct request_queue *q) 
	blk_mq_freeze_queue_wait(q);

}



static void blk_mq_unfreeze_queue(struct request_queue *q)

void blk_mq_unfreeze_queue(struct request_queue *q)

{

	bool wake;
@@ -149,6 +150,7 @@ static void blk_mq_unfreeze_queue(struct request_queue *q) 
		wake_up_all(&q->mq_freeze_wq);

	}

}

EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue);



bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx)

{

include/linux/blk-mq.h

+2 −0
Original line number Diff line number Diff line
@@ -212,6 +212,8 @@ void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async); 
void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);

void blk_mq_tag_busy_iter(struct blk_mq_hw_ctx *hctx, busy_iter_fn *fn,

		void *priv);

void blk_mq_unfreeze_queue(struct request_queue *q);

void blk_mq_freeze_queue_start(struct request_queue *q);



/*

 * Driver command data is immediately after the request. So subtract request