{
{   The purpose of this request is to obtain the permanent file root as stored
{ in the master volume set table.  The master volume set table is assumed open
{ prior  to  this request, and the volume set table is assumed to be that of a
{ master volume.
{
{       STP$OBTAIN_VST_PF_ROOT (P_MASTER_VST, PF_ROOT, STATUS)
{
{ P_MASTER_VOL: (input) This parameter  specifies  a  pointer  to  the  master
{       volume set table that is to be read to obtain the pf root.
{
{ PF_ROOT:  (input,  output)  This  parameter provides a container in which to
{       store the permanent file root.
{
{ STATUS: (output) This parameter returns the request status.
{
{       CONDITIONS: ste$incorrect_root_size
{                   ste$pf_root_not_stored
{
{       IDENTIFIER: stc$set_management_id
{
