* given by \a arg_obj, and the combined buffer is made available to the afs
* process via the callback method. See \ref send_callback_request for details.
*
* \return Negative on errors, the return value of the underlying call to
* send_callback_request() otherwise.
*/
* given by \a arg_obj, and the combined buffer is made available to the afs
* process via the callback method. See \ref send_callback_request for details.
*
* \return Negative on errors, the return value of the underlying call to
* send_callback_request() otherwise.
*/