+sub doc_storage_enabled {
+  return 0 unless $::instance_conf->get_doc_storage;
+  return 1 if     $::instance_conf->get_doc_storage_for_documents eq 'Filesystem' && $::instance_conf->get_doc_files;
+  return 1 if     $::instance_conf->get_doc_storage_for_documents eq 'Webdav'     && $::instance_conf->get_doc_webdav;
+  return 0;
+}
+