DLM_DEVICE_VERSION_MAJOR
if (req->version[0] != DLM_DEVICE_VERSION_MAJOR ||
(req->version[0] == DLM_DEVICE_VERSION_MAJOR &&
DLM_DEVICE_VERSION_MAJOR,
result.version[0] = DLM_DEVICE_VERSION_MAJOR;
ver.version[0] = DLM_DEVICE_VERSION_MAJOR;