<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _initFilesystemInfo(self):
 """Initialize filesystem to device mappings."""

        self._mapFSpathDev = {}
        fsinfo = FilesystemInfo()
        for fs in fsinfo.getFSlist():
            devpath = fsinfo.getFSdev(fs)
            dev = self._getUniqueDev(devpath)
            if dev is not None:
                self._mapFSpathDev[fs] = dev