summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorMike Snitzer <snitzer@redhat.com>2014-02-28 15:33:43 +0100
committerMike Snitzer <snitzer@redhat.com>2014-03-27 16:56:24 -0400
commit9974fa2c6a7d470ca3c201fe7dbac64bf4dd8d2a (patch)
tree623ceaee0342585c95c0eca67ab3e6c4f03bb9e2
parent17f4ff45b58742e2cb32fce6e406dbdb4b32a1e7 (diff)
downloadlinux-9974fa2c6a7d470ca3c201fe7dbac64bf4dd8d2a.tar.gz
linux-9974fa2c6a7d470ca3c201fe7dbac64bf4dd8d2a.tar.bz2
linux-9974fa2c6a7d470ca3c201fe7dbac64bf4dd8d2a.zip
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>
-rw-r--r--drivers/md/dm-table.c19
-rw-r--r--drivers/md/dm.c5
-rw-r--r--drivers/md/dm.h1
-rw-r--r--include/linux/device-mapper.h5
4 files changed, 30 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 2ae35b2f80fd..50601ec7017a 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -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)
{
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 6382213dbd88..455e64916498 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -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;
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 88cc58c5871a..ed76126aac54 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -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,
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 5eeeab470cfd..63da56ed9796 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -463,6 +463,11 @@ 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.
*/