How to make IO Manager call my AddDevice routine in my driver?

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Windows

driver

Hi all!
I am a new guy for driver development. I had written a drive to implement a virtual disk through file. The DriverEntry routine is as below:

NTSTATUS DriverEntry(PDRIVER_OBJECT drvObject, PUNICODE_STRING usRegPath)
{
	PKEY_VALUE_PARTIAL_INFORMATION startKeyValue;
	ULONG version;
	int i;
 
	Dump("DriverEntry " DRIVER_NAME " " DRIVER_VERSION "\n");
 
	memset(&OsVersion, 0, sizeof(RTL_OSVERSIONINFOW));
	OsVersion.dwOSVersionInfoSize = sizeof(RTL_OSVERSIONINFOW);
	RtlGetVersion(&OsVersion);
	//Dump("RtlGetVersion:%d,%d\r\n", OsVersion.dwMajorVersion, OsVersion.dwMinorVersion);
	// Load dump filter if the main driver is already loaded
	if (NT_SUCCESS (FDDeviceIoControl (NT_ROOT_PREFIX, FD_IOCTL_GET_DRIVER_VERSION, NULL, 0, &version, sizeof (version))))
		return DumpFilterEntry ((PFILTER_EXTENSION) drvObject, (PFILTER_INITIALIZATION_DATA) usRegPath);
 
	FDDriverObject = drvObject;
	memset(VirtualVolumeDeviceObjects, 0, sizeof(VirtualVolumeDeviceObjects));
 
	if(NT_SUCCESS(FDReadRegistryKey(usRegPath, L"Start", &startKeyValue)))
	{
		if(startKeyValue->Type == REG_DWORD && *((uint32 *)startKeyValue->Data) == SERVICE_BOOT_START)
		{
			LoadBootArguments();
		}
		FDfree(startKeyValue);
	}
	else
	{
		Dump("Read registry key value failure!\n");
	}
 
	VolumeClassFilterRegistered = IsVolumeClassFilterRegistered();
	ReportBOOL("VolumeClassFilterRegistered", VolumeClassFilterRegistered);
 
	for (i = 0; i <= IRP_MJ_MAXIMUM_FUNCTION; ++i)
	{
		FDDriverObject->MajorFunction[i] = FDDispatchQueueIRP;
	}
	FDDriverObject->DriverExtension->AddDevice = FileDiskAddDevice;
 
	drvObject->DriverUnload = UnloadDriver;
 
	return FDCreateRootDeviceObject(FDDriverObject);
}

In the code above, I had register a AddDevice routine named FileDiskAddDevice. Through the message output by DebugPrint, I look my driver can be loaded successfully by system. Next, I want to make IO manager call my AddDevice routine. But I don't know how to do it. My driver is just for a virtual device. No real device fits it. So I can't add device by unplug and plug again. I hope someone can be kind to tell me what I should do. Thank you! Smile | :)

Be regards!