'Mount the device into the file system.'

def mnt_dev(self):

    LOG.debug('Mount    %(dev)s    on    %(dir)s', {'dev': self.mapped_device, 'dir': self.mount_dir})
    (_out, err) = utils.trycmd('mount', self.mapped_device, self.mount_dir, discard_warnings=True, run_as_root=True)
    if err:
        self.error = (_('Failed    to    mount    filesystem:    %s') % err)
        LOG.debug(self.error)
        return False
    self.mounted = True
    return True
