def set_description(self, dbg, sr, key, new_description):
     VHDVolume.set_description(
         dbg,
         sr,
         key,
         new_description,
         gfs2.Callbacks()
     )
 def set_description(self, dbg, sr, key, new_description):
     VHDVolume.set_description(key, new_description, gfs2BaseCallbacks)
     return None