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Commit e0c10752 authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm rq: introduce dm_mq_kick_requeue_list() 



Make it possible for a request-based target to kick the DM device's
blk-mq request_queue's requeue_list.

Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
parent fbc39b4c

drivers/md/dm-rq.c

+13 −4
Original line number Diff line number Diff line
@@ -336,19 +336,28 @@ static void dm_old_requeue_request(struct request *rq) 
	spin_unlock_irqrestore(q->queue_lock, flags);

}



static void dm_mq_delay_requeue_request(struct request *rq, unsigned long msecs)

static void __dm_mq_kick_requeue_list(struct request_queue *q, unsigned long msecs)

{

	struct request_queue *q = rq->q;

	unsigned long flags;



	blk_mq_requeue_request(rq);



	spin_lock_irqsave(q->queue_lock, flags);

	if (!blk_queue_stopped(q))

		blk_mq_delay_kick_requeue_list(q, msecs);

	spin_unlock_irqrestore(q->queue_lock, flags);

}



void dm_mq_kick_requeue_list(struct mapped_device *md)

{

	__dm_mq_kick_requeue_list(dm_get_md_queue(md), 0);

}

EXPORT_SYMBOL(dm_mq_kick_requeue_list);



static void dm_mq_delay_requeue_request(struct request *rq, unsigned long msecs)

{

	blk_mq_requeue_request(rq);

	__dm_mq_kick_requeue_list(rq->q, msecs);

}



static void dm_requeue_original_request(struct dm_rq_target_io *tio, bool delay_requeue)

{

	struct mapped_device *md = tio->md;

drivers/md/dm-rq.h

+2 −0
Original line number Diff line number Diff line
@@ -55,6 +55,8 @@ void dm_mq_cleanup_mapped_device(struct mapped_device *md); 
void dm_start_queue(struct request_queue *q);

void dm_stop_queue(struct request_queue *q);



void dm_mq_kick_requeue_list(struct mapped_device *md);



unsigned dm_get_reserved_rq_based_ios(void);



ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf);