private function removeFromCache(ICachedMountInfo $mount)
{
$builder = $this->connection->getQueryBuilder();
$query = $builder->delete('mounts')->where($builder->expr()->eq('user_id', $builder->createNamedParameter($mount->getUser()->getUID())))->andWhere($builder->expr()->eq('root_id', $builder->createNamedParameter($mount->getRootId(), IQueryBuilder::PARAM_INT)));
$query->execute();
}