ScsiClass2分析

我感觉磁盘驱动是mini driver+class driver。

其中class2.sys就是类驱动
而disk.sys就是mini driver

mini driver的DriverEntry调用

NTSTATUS STDCALL
DriverEntry(IN PDRIVER_OBJECT DriverObject,
	    IN PUNICODE_STRING RegistryPath)
{
  CLASS_INIT_DATA InitData;

  RtlZeroMemory(&InitData,
		sizeof(CLASS_INIT_DATA));

  InitData.InitializationDataSize = sizeof(CLASS_INIT_DATA);
  InitData.DeviceExtensionSize = sizeof(DEVICE_EXTENSION) + sizeof(DISK_DATA);
  InitData.DeviceType = FILE_DEVICE_DISK;
  InitData.DeviceCharacteristics = 0;

  InitData.ClassError = NULL;	// DiskClassProcessError;
  InitData.ClassReadWriteVerification = DiskClassCheckReadWrite;
  InitData.ClassFindDeviceCallBack = DiskClassCheckDevice;
  InitData.ClassFindDevices = DiskClassFindDevices;
  InitData.ClassDeviceControl = DiskClassDeviceControl;
  InitData.ClassShutdownFlush = DiskClassShutdownFlush;
  InitData.ClassCreateClose = NULL;
  InitData.ClassStartIo = NULL;

  return(ScsiClassInitialize(DriverObject,
			     RegistryPath,
			     &InitData));
}

在ScsiClassInitialize中，它利用\Device\ScsiPort0或\Device\ScsiPort1读取磁盘资料。

	  /* check scsi port for attached disk drives */
	  if (InitializationData->ClassFindDevices(DriverObject,
						   Argument2,
						   InitializationData,
						   PortDeviceObject,
						   PortNumber))
	    {
	      DiskFound = TRUE;
	    }

下面是disk.sys中的DiskClassFindDevices