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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: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
This commit is contained in:
Mike Snitzer 2014-02-28 15:33:43 +01:00
parent 17f4ff45b5
commit 9974fa2c6a
4 changed files with 30 additions and 0 deletions
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19
drivers/md/dm-table.c
View File

@ -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)
{

5
drivers/md/dm.c
View File

@ -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;

1
drivers/md/dm.h
View File

@ -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,

5
include/linux/device-mapper.h
View File

@ -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.