drbd: drbd_md_sync before calling user space helpers
Just in case we have some pending meta data changes to sync, do it before we call our userland helper, as that may take some time, or even cause a hard reboot. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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