drbd: separate out __al_write_transaction helper function
To be able to "force out" an activity log transaction, even if there are no pending updates. This will be used to relocate the on-disk activity log, if the on-disk offsets have to be changed, without the need to empty the activity log first. While at it, move the definition, so we can drop the forward declaration of a static helper. Signed-off-by: NPhilipp Reisner <philipp.reisner@linbit.com> Signed-off-by: NLars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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