{
{   The purpose of this procedure is to assign mass storage to
{ the segment specified. If this is the initial mass storage
{ assignment for this segment, device management will assign
{ a disk_file_descriptor to this segment, and the media field
{ of the file_descriptor_entry for this segment will be modified
{ from gfc$fm_transient_segment to gfc$fm_mass_storage_file.
{
{   MMP$ASSIGN_MASS_STORAGE (segment_number, minimum_allocation_length, status)
{
{ SEGMENT_NUMBER: (input) This parameter specifies the segment number of
{        the segment which requires disk space allocation.
{
{ MINIMUM_ALLOCATION_LENGTH: (input) This parameter specifies the minimum
{        amount of space which needs to be allocated.
{
{ STATUS: (output) This parameter specifies the request status.
{
