win32 文件过滤驱动中如何获得硬盘的大小

[月竹影]

Hi，各位大侠，
我最近遇到一个比较头痛的问题，我在一个文件驱动中在设备加载的时候想获得硬盘的大小
我往下传IOCTL_DISK_GET_DRIVE_GEOMETRY_EX控制命令，成功了，但是返回值都是0，大家有什么好的解决方法不？

NTSTATUS GetDiskGeometry(IN PDEVICE_OBJECT pDiskDevObj, 
						 OUT LARGE_INTEGER * pDiskSize)
{
    IO_STATUS_BLOCK IoStatusBlock;
    KEVENT Event;
    PIRP pIrp;
    NTSTATUS status;
	DISK_GEOMETRY_EX       diskGeo;
	PDISK_GEOMETRY_EX      diskGeometry;
	ULONG size ;


	/* allocate memory
   */
    size = sizeof (DISK_GEOMETRY_EX);
    diskGeometry =&diskGeo; 

    RtlZeroMemory(diskGeometry, sizeof(DISK_GEOMETRY_EX));
    KeInitializeEvent(&Event, NotificationEvent, FALSE);

	while(true)
	{
		/* Request for the device geometry
		   */
	  pIrp = IoBuildDeviceIoControlRequest (IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
										   pDiskDevObj,
										   NULL,
										   0,
										   (PVOID)diskGeometry,
										   size,
										   FALSE,
										   &Event,
										   &IoStatusBlock);
	
		if (!pIrp) 
		{
			//return STATUS_INSUFFICIENT_RESOURCES;
			KeResetEvent(&Event);
			break;
		}

		status = IoCallDriver(pDiskDevObj, pIrp);
		if (status == STATUS_PENDING) 
		{
			KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
			status = IoStatusBlock.Status;
		}

		if (NT_SUCCESS(status))
		{
			pDiskSize->QuadPart = diskGeometry->DiskSize.QuadPart;
			if(pDiskSize->QuadPart!=0)
			{
				return status;
			}
		}

		break;
	}

    pIrp = IoBuildDeviceIoControlRequest(
        IOCTL_DISK_GET_DRIVE_GEOMETRY,
        pDiskDevObj,
        NULL,
        0, 
        &diskGeometry->Geometry,
        sizeof(DISK_GEOMETRY),
        FALSE, 
        &Event,
        &IoStatusBlock);

    if (!pIrp) 
    {
        return STATUS_INSUFFICIENT_RESOURCES;
    }
    status = IoCallDriver(pDiskDevObj, pIrp);
    if (status == STATUS_PENDING) 
    {
        KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
        status = IoStatusBlock.Status;
    }

	if (NT_SUCCESS(status))
	{
		pDiskSize->QuadPart = diskGeometry->Geometry.Cylinders.QuadPart*diskGeometry->Geometry.SectorsPerTrack*diskGeometry->Geometry.TracksPerCylinder;
	}
    return status;
}

[毕健]