drbd: Call drbd_md_sync() explicitly after a state change on the connection

Without this, the meta-data gets updates after 5 seconds by the
md_sync_timer. Better to do it immeditaly after a state change.

If the asender detects a network failure, it may take a bit until
the worker processes the according after-conn-state-change work item.

  The worker might be blocked in sending something, i.e. it
  takes until it gets into its timeout. That is 6 seconds by
  default which is longer than the 5 seconds of the md_sync_timer.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 732053de1db..5e5a6abb281 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2820,6 +2820,22 @@ void drbd_free_sock(struct drbd_tconn *tconn)
 
 /* meta data management */
 
+void conn_md_sync(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_md_sync(mdev);
+                kref_put(&mdev->kref, &drbd_minor_destroy);
+                rcu_read_lock();
+        }
+        rcu_read_unlock();
+}
+
 struct meta_data_on_disk {
         u64 la_size;           /* last agreed size. */
         u64 uuid[UI_SIZE];   /* UUIDs. */