def __init__(self, pool, dataset, mountpoint=None, size=None,
                 reactor=None):
        self.pool = pool
        self.dataset = dataset
        self._mountpoint = mountpoint
        self.size = size
        if reactor is None:
            from twisted.internet import reactor
        self._reactor = reactor
:param pool: The filesystem's pool name, e.g. ``b"hpool"``.
dataset/ETHPy150Open ClusterHQ/flocker/flocker/volume/filesystems/zfs.py/Filesystem.__init__