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Commit f91328c4 authored by Keith Busch's avatar Keith Busch Committed by Jens Axboe
Browse files

blk-mq: Provide freeze queue timeout 



A driver may wish to take corrective action if queued requests do not
complete within a set time.

Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 6bae363e

block/blk-mq.c

+9 −0
Original line number Diff line number Diff line
@@ -81,6 +81,15 @@ void blk_mq_freeze_queue_wait(struct request_queue *q) 
}

EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_wait);



int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,

				     unsigned long timeout)

{

	return wait_event_timeout(q->mq_freeze_wq,

					percpu_ref_is_zero(&q->q_usage_counter),

					timeout);

}

EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_wait_timeout);



/*

 * Guarantee no request is in use, so we can change any data structure of

 * the queue afterward.

include/linux/blk-mq.h

+2 −0
Original line number Diff line number Diff line
@@ -246,6 +246,8 @@ void blk_mq_freeze_queue(struct request_queue *q); 
void blk_mq_unfreeze_queue(struct request_queue *q);

void blk_mq_freeze_queue_start(struct request_queue *q);

void blk_mq_freeze_queue_wait(struct request_queue *q);

int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,

				     unsigned long timeout);

int blk_mq_reinit_tagset(struct blk_mq_tag_set *set);



int blk_mq_map_queues(struct blk_mq_tag_set *set);