WRITE_TO_IO_REQUEST_REPLY
WriteToIORequestReply() : ReplyRequest(WRITE_TO_IO_REQUEST_REPLY) {}
case WRITE_TO_IO_REQUEST_REPLY:
case WRITE_TO_IO_REQUEST_REPLY:
case WRITE_TO_IO_REQUEST_REPLY:
UserlandRequestHandler handler(fileSystem, WRITE_TO_IO_REQUEST_REPLY);