{
{    This request will allocate space from a volume.  The volume from which
{  to allocate space is a parameter to the request.  The number of allocation
{  units to allocate and the requested allocation style are parameters to
{  the request.  As much space as can be obtained will be allocated from the
{  volume.  The actual number of allocation units obtained is returned as a
{  parameter.
{
{        DMP$ALLOCATE_FILE_SPACE (ALLOCATE_REQUEST_BLOCK)
{
{  ALLOCATE_REQUEST_BLOCK : (input/output)  This parameter specifies an allocate
{       request block.
{
