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>
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 2ae35b2..50601ec 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1618,6 +1618,25 @@
}
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)
{