简单的过滤驱动测试为何通不过

【求助】简单的过滤驱动测试为何通不过

以下是一个简单的过滤驱动，简单将所有irp转发到下一层。我把它注册为卷过滤驱动，当只有1个卷的时候，运行正常，当有2个卷的时候就蓝屏了，为什么？
如果把它注册为磁盘过滤驱动，则不管1个磁盘还是2个磁盘，都蓝屏，为什么？
求驱动大牛指教。

#include <ntddk.h>
#include <wdm.h>

typedef struct MYFILTER_DEV_EXTENSION_
{
  PDEVICE_OBJECT      FltDevObj;
  PDEVICE_OBJECT      LowerDevObj;
  PDEVICE_OBJECT      PhyDevObj;

} MYFILTER_DEV_EXTENSION, *PMYFILTER_DEV_EXTENSION;

NTSTATUS
myAddDevice(
    IN  PDRIVER_OBJECT  DriverObject,
    IN  PDEVICE_OBJECT  PhysicalDeviceObject
    )
{
  NTSTATUS        ntStatus = STATUS_SUCCESS;
  PMYFILTER_DEV_EXTENSION MyFlt_Ext;
  PDEVICE_OBJECT  FltDevObj = NULL;
  PDEVICE_OBJECT  LowerDevObj = NULL;
  ntStatus = IoCreateDevice(
    DriverObject,
    sizeof(MYFILTER_DEV_EXTENSION),
    NULL,
    FILE_DEVICE_DISK,
    FILE_DEVICE_SECURE_OPEN,
    FALSE,
    &FltDevObj);
  ntStatus = IoAttachDeviceToDeviceStackSafe(
    FltDevObj,
    PhysicalDeviceObject,
    &LowerDevObj);
  MyFlt_Ext=(PMYFILTER_DEV_EXTENSION)FltDevObj->DeviceExtension;
  MyFlt_Ext->LowerDevObj=LowerDevObj;
  return STATUS_SUCCESS;
}

VOID
myUnload(
  IN  PDRIVER_OBJECT  DriverObject
  )
{
  UNREFERENCED_PARAMETER(DriverObject);
  return;
}

NTSTATUS myDispatchAny( IN PDEVICE_OBJECT  DeviceObject, IN PIRP  Irp )
{
        PMYFILTER_DEV_EXTENSION MyFlt_Ext;
        PDEVICE_OBJECT lowdev;
        IoSkipCurrentIrpStackLocation(Irp);
        MyFlt_Ext=PMYFILTER_DEV_EXTENSION (DeviceObject->DeviceExtension);
  lowdev=MyFlt_Ext->LowerDevObj;
        return(IoCallDriver(lowdev, Irp));
}

NTSTATUS
DriverEntry(
    IN  PDRIVER_OBJECT  DriverObject,
    IN  PUNICODE_STRING  RegistryPath
    )
{
  int i;
  for (i = 0; i <= IRP_MJ_MAXIMUM_FUNCTION; i++)
  {
    DriverObject->MajorFunction[i] = myDispatchAny;
  }

        DriverObject->DriverExtension->AddDevice = myAddDevice;
  DriverObject->DriverUnload = myUnload;
        return STATUS_SUCCESS;
}

------解决方案--------------------
注册成卷过滤驱动（Volume，你懂得）；
要注意的地方：
对Pnp请求，必须对分页请求进行计数，设置相关的设备对象Flag标记。
你上面的代码，在AddDevice例程中对设备对象的重要标志位都没处理，自己去看看MSDN或书吧。

简单的过滤驱动测试为何通不过

相关推荐