drbd: Fix the WO=drain implementation for multiple volumes
Wait until IO is drained in all volumes.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 6675e2c..be8f469 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1334,6 +1334,22 @@
wake_up(&mdev->misc_wait);
}
+void conn_wait_active_ee_empty(struct drbd_tconn *tconn)
+{
+ struct drbd_conf *mdev;
+ int vnr;
+
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, mdev, vnr) {
+ kref_get(&mdev->kref);
+ rcu_read_unlock();
+ drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
+ kref_put(&mdev->kref, &drbd_minor_destroy);
+ rcu_read_lock();
+ }
+ rcu_read_unlock();
+}
+
static int receive_Barrier(struct drbd_tconn *tconn, struct packet_info *pi)
{
struct drbd_conf *mdev;
@@ -1372,7 +1388,7 @@
case WO_bdev_flush:
case WO_drain_io:
- drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
+ conn_wait_active_ee_empty(tconn);
drbd_flush(tconn);
if (atomic_read(&tconn->current_epoch->epoch_size)) {