md/plug: optionally use plugger to unplug an array during resync/recovery.
If an array doesn't have a 'queue' then md_do_sync cannot
unplug it.
In that case it will have a 'plugger', so make that available
to the mddev, and use it to unplug the array if needed.
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 5be0d69..57eb864 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -328,6 +328,8 @@
struct list_head all_mddevs;
struct attribute_group *to_remove;
+ struct plug_handle *plug; /* if used by personality */
+
/* Generic barrier handling.
* If there is a pending barrier request, all other
* writes are blocked while the devices are flushed.
