code: def _getUniqueDev(self, devpath):
          
          realpath = os.path.realpath(devpath)
          mobj = re.match('\/dev\/(.*)$', realpath)
          if mobj:
              dev = mobj.group(1)
              if dev in self._diskStats:
                  return dev
              else:
                  try:
                      (major, minor) = self._getDevMajorMinor(realpath)
                  except:
                      return None
                  return self._mapMajorMinor2dev.get((major, minor))
          return None
docs: Return unique device for any block device path.
          
          @param devpath: Full path for block device.
          @return:        Unique device string without the /dev prefix.