def __init__(self):
        vstruct.VStruct.__init__(self)
        self.SizeOfFsFilterCallbackData = v_uint32()
        self.Operation = v_uint8()
        self.Reserved = v_uint8()
        self._pad0008 = v_bytes(size=2)
        self.DeviceObject = v_ptr32()
        self.FileObject = v_ptr32()
        self.Parameters = FS_FILTER_PARAMETERS()