filemon中一段代码，百思不得其解，望大家帮忙

//----------------------------------------------------------------------
//
// FilemonQueryFile
//
// This function retrieves the \"standard\" information for the
// underlying file system, asking for the filename in particular.
//
//----------------------------------------------------------------------

BOOLEAN
FilemonQueryFile(
    PDEVICE_OBJECT DeviceObject,
    PFILE_OBJECT FileObject,
    FILE_INFORMATION_CLASS FileInformationClass,
    PVOID FileQueryBuffer,
    ULONG FileQueryBufferLength
    )
{
    PIRP irp;
    KEVENT Queryevent;
    IO_STATUS_BLOCK IoStatusBlock;
    PIO_STACK_LOCATION ioStackLocation;

    DbgPrint((\"Getting file name for %x\\n\", FileObject));

    //
    // Initialize the event
    //
    KeInitializeEvent(&Queryevent, SynchronizationEvent, FALSE);

    //
    // Allocate an irp for this request.  This could also come from a
    // private pool, for instance.
    //
    irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);
    if(!irp) {

        //
        // Failure!
        //
        return FALSE;
    }
  
    //
    // Build the IRP\'s main body
    //  
    irp->AssociatedIrp.SystemBuffer = FileQueryBuffer;
    irp->UserEvent = &Queryevent;
    irp->UserIosb = &IoStatusBlock;
    irp->Tail.Overlay.Thread = PsGetCurrentThread();
    irp->Tail.Overlay.OriginalFileObject = FileObject;
    irp->RequestorMode = KernelMode;
    irp->Flags = 0;

    //
    // Set up the I/O stack location.
    //
    ioStackLocation = IoGetNextIrpStackLocation(irp);
    //ioStackLocation->MajorFunction = IRP_MJ_QUERY_INFORMATION;
ioStackLocation->MajorFunction = IRP_MJ_READ;
    ioStackLocation->DeviceObject = DeviceObject;
    ioStackLocation->FileObject = FileObject;
ioStackLocation->Parameters.Read.Length = 64;
ioStackLocation->Parameters.Read.ByteOffset.QuadPart = (LONGLONG) 0;
    //ioStackLocation->Parameters.QueryFile.Length = FileQueryBufferLength;
    //ioStackLocation->Parameters.QueryFile.FileInformationClass = FileInformationClass;

    //
    // Set the completion routine.
    //
    IoSetCompletionRoutine(irp, QueryFileComplete, 0, TRUE, TRUE, TRUE);

    //
    // Send it to the FSD
    //
    (void) IoCallDriver(DeviceObject, irp);

    //
    // Wait for the I/O
    //
    KeWaitForSingleObject(&Queryevent, Executive, KernelMode, TRUE, 0);

    //
    // Done! Note that since our completion routine frees the IRP we cannot
    // touch the IRP now.
    //
    return NT_SUCCESS( IoStatusBlock.Status );
}
此代码是我变形厚的代码，改为READ，注释掉的是原代码部分，放在FILEMONGETFULLPATH函数中FILEMONQUERYFILE后，IOCALLDRIVER后返回0XC000000D，查得好象是参数错误，但是我真不知参数哪里有错，请大家指教。如用其原代码不会出错，但是，如果把其原代码放在FILEMONGETFULLPATH函数外，我放在CREATE中，也得到0XC000000D错误，敬请指教。
希望大家能给出创建IRP的好的例子代码。THX

换成IRP_MJ_READ后后的错误是明显的：对于不同类型的IRP，其参数设置是不同的，该段代码对应于API函数GetFileAttributes，如果想都数据的话好多参数得重新设置，如果没有参考资料并且又不是系统调试高手的话基本上是设不对的。想读数据的话用IoBuildAsynchronousFsdRequest构造IRP，这样参数设置会简单些，但也不容易。

谢谢sijun