A wrapper of JFS.getObject(), with some tweaks that make sense in a file system.

def _getpath(self, path):
        "A wrapper of JFS.getObject(), with some tweaks that make sense in a file system."
        if is_blacklisted(path):
            raise JottaFuseError('Blacklisted file, refusing to retrieve it')

        return self.client.getObject(path)