surf_workstation_model->extension.workstation.ls = ws_action_ls;
surf_workstation_model->extension.workstation.get_size = ws_file_get_size;
surf_workstation_model->extension.workstation.get_free_size = ws_storage_get_free_size;
surf_workstation_model->extension.workstation.ls = ws_action_ls;
surf_workstation_model->extension.workstation.get_size = ws_file_get_size;
surf_workstation_model->extension.workstation.get_free_size = ws_storage_get_free_size;