{
{   The purpose of this request is to allow volume management to notify set
{ management that a disk volume has become inactive.  Volume management must
{ issue this request for all disk volumes that become inactive or unenabled.
{ Set management can then update its tables, so that on future
{ requests from volume management the volume
{ list returned will be correct.
{ If there are still permanent file users on the set, an attempt will be made
{ to mount the inactive volume.
{
{       STP$DISK_VOLUME_INACTIVE (INACTIVE_VOL, INTERNAL_VSN, SET_ORDINAL,
{          DM_PACKET, STATUS)
{
{ INACTIVE_VOL: (input) This parameter specifies the recorded vsn of the
{       volume that has just been inactivated or become unavailable.
{
{ INTERNAL_VSN: (input) This parameter specifies the internal vsn of the
{       new active volume.
{
{ SET_ORDINAL: (input) This parameter specifies the set ordinal
{       associated with the volume.  The set ordinal was originally placed
{       in the active volume table as a result of a stp$disk_volume_active,
{       or dmp$store_set_ordinal.
{
{ DM_PACKET: (input) This parameter specifies a 'packet' of information
{       that the device manager expects the set manager to store away
{       and retrieve when asked.
{       The set manager is not concerned with the contents of this packet.
{
{ STATUS: (output) This parameter returns the request status.
{
{        CONDITIONS: ste$down_vol_used
{                    ste$dm_ast_mismatch
{                    ste$attach_df_error
{                    ste$open_error
{                    ste$dm_mel_mismatch
{                    ste$internal_vsn_mismatch
{                       OTHERS
{
{        IDENTIFIER: stc$set_management_id
{
