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Commit 9974fa2c authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm table: add dm_table_run_md_queue_async 



Introduce dm_table_run_md_queue_async() to run the request_queue of the
mapped_device associated with a request-based DM table.

Also add dm_md_get_queue() wrapper to extract the request_queue from a
mapped_device.

Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarHannes Reinecke <hare@suse.de>
Reviewed-by: default avatarJun'ichi Nomura <j-nomura@ce.jp.nec.com>
parent 17f4ff45

drivers/md/dm-table.c

+19 −0
Original line number Diff line number Diff line
@@ -1618,6 +1618,25 @@ struct mapped_device *dm_table_get_md(struct dm_table *t) 
}

EXPORT_SYMBOL(dm_table_get_md);



void dm_table_run_md_queue_async(struct dm_table *t)

{

	struct mapped_device *md;

	struct request_queue *queue;

	unsigned long flags;



	if (!dm_table_request_based(t))

		return;



	md = dm_table_get_md(t);

	queue = dm_get_md_queue(md);

	if (queue) {

		spin_lock_irqsave(queue->queue_lock, flags);

		blk_run_queue_async(queue);

		spin_unlock_irqrestore(queue->queue_lock, flags);

	}

}

EXPORT_SYMBOL(dm_table_run_md_queue_async);



static int device_discard_capable(struct dm_target *ti, struct dm_dev *dev,

				  sector_t start, sector_t len, void *data)

{

drivers/md/dm.c

+5 −0
Original line number Diff line number Diff line
@@ -468,6 +468,11 @@ sector_t dm_get_size(struct mapped_device *md) 
	return get_capacity(md->disk);

}



struct request_queue *dm_get_md_queue(struct mapped_device *md)

{

	return md->queue;

}



struct dm_stats *dm_get_stats(struct mapped_device *md)

{

	return &md->stats;

drivers/md/dm.h

+1 −0
Original line number Diff line number Diff line
@@ -188,6 +188,7 @@ int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only 
int dm_cancel_deferred_remove(struct mapped_device *md);

int dm_request_based(struct mapped_device *md);

sector_t dm_get_size(struct mapped_device *md);

struct request_queue *dm_get_md_queue(struct mapped_device *md);

struct dm_stats *dm_get_stats(struct mapped_device *md);



int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,

include/linux/device-mapper.h

+5 −0
Original line number Diff line number Diff line
@@ -462,6 +462,11 @@ struct mapped_device *dm_table_get_md(struct dm_table *t); 
 */

void dm_table_event(struct dm_table *t);



/*

 * Run the queue for request-based targets.

 */

void dm_table_run_md_queue_async(struct dm_table *t);



/*

 * The device must be suspended before calling this method.

 * Returns the previous table, which the caller must destroy.