code: def cli(env, volume_id, reason, immediate):
      
  
      file_storage_manager = SoftLayer.FileStorageManager(env.client)
  
      if not (env.skip_confirmations or formatting.no_going_back(volume_id)):
          raise exceptions.CLIAbort('Aborted')
  
      cancelled = file_storage_manager.cancel_snapshot_space(
          volume_id, reason, immediate)
  
      if cancelled:
          if immediate:
              click.echo('File volume with id %s has been marked'
                         ' for immediate snapshot cancellation' % volume_id)
          else:
              click.echo('File volume with id %s has been marked'
                         ' for snapshot cancellation' % volume_id)
      else:
          click.echo('Unable to cancel snapshot space for file volume %s'
                     % volume_id)
docs: Cancel existing snapshot space for a given volume.