Win7上sfilter的SfFsControlMountVolumeComplete代码 里的有关问题

Win7下sfilter的SfFsControlMountVolumeComplete代码 里的问题
一楼先贴代码

NTSTATUS SfFsControlMountVolumeComplete (

    IN PDEVICE_OBJECT DeviceObject,

    IN PIRP Irp,

    IN PDEVICE_OBJECT NewDeviceObject)

{

    PVPB vpb;

    PSFILTER_DEVICE_EXTENSION newDevExt;

    PIO_STACK_LOCATION irpSp;

    PDEVICE_OBJECT attachedDeviceObject;

    NTSTATUS status;

    BOOLEAN justAttached = FALSE;


#if 1  // 要在底层文件系统mount完后，检测其是否是移动设备的

	DWORD dwPos = 0;

	char buf[256] = {0,0};

	WCHAR wzLocalDrive[256] = {0, 0};

	HANDLE ntFileHandle;

	OBJECT_ATTRIBUTES  oaVolumeDeviceAttributes;

	STORAGE_DEVICE_DESCRIPTOR *pDevDesc = (STORAGE_DEVICE_DESCRIPTOR*)buf;

	IO_STATUS_BLOCK IoStatusBlock;

	BOOL bFindLocalDisk = FALSE;

#endif


    PAGED_CODE();

    newDevExt = NewDeviceObject->DeviceExtension;

    irpSp = IoGetCurrentIrpStackLocation( Irp );


    vpb = newDevExt->NLExtHeader.StorageStackDeviceObject->Vpb;


    if (vpb != irpSp->Parameters.MountVolume.Vpb) 

	{

        SF_LOG_PRINT( SFDEBUG_DISPLAY_ATTACHMENT_NAMES,

                      ("SFilter!SfFsControlMountVolume:    VPB in IRP stack changed  %p IRPVPB=%p VPB=%p\n",

                       vpb->DeviceObject,

                       irpSp->Parameters.MountVolume.Vpb,

                       vpb) );

    }


    //  看看是否mount成功.

    if (NT_SUCCESS( Irp->IoStatus.Status )) 

	{

        SF_LOG_PRINT( SFDEBUG_DISPLAY_ATTACHMENT_NAMES,

                      ("SFilter!SfFsControlMountVolume:    Mount volume success for  %p \"%wZ\", status=%08x\n",

                       DeviceObject,

                       &newDevExt->NLExtHeader.DeviceName,

                       Irp->IoStatus.Status) );


        ExAcquireFastMutex( &gSfilterAttachLock );


        if (!SfIsAttachedToDevice( vpb->DeviceObject, &attachedDeviceObject )) 

		{

			if(IS_WINDOWSVISTA_OR_LATER()) {

				// 在这里加入判断介质类型

				SF_LOG_PRINT_VISTA( SFDEBUG_DISPLAY_JIM1, \