typedef struct _IO_STACK_LOCATION {
  UCHAR  MajorFunction;
  UCHAR  MinorFunction;
  UCHAR  Flags;
  UCHAR  Control;
  union {
        //
        // Parameters for IRP_MJ_CREATE 
        //
        struct {
            PIO_SECURITY_CONTEXT SecurityContext;
            ULONG Options;
            USHORT POINTER_ALIGNMENT FileAttributes;
            USHORT ShareAccess;
            ULONG POINTER_ALIGNMENT EaLength;
        } Create;
        //
        // Parameters for IRP_MJ_READ 
        //
        struct {
            ULONG Length;
            ULONG POINTER_ALIGNMENT Key;
            LARGE_INTEGER ByteOffset;
        } Read;
        //
        // Parameters for IRP_MJ_WRITE 
        //
        struct {
            ULONG Length;
            ULONG POINTER_ALIGNMENT Key;
            LARGE_INTEGER ByteOffset;
        } Write;
        //
        // Parameters for IRP_MJ_QUERY_INFORMATION 
        //
        struct {
            ULONG Length;
            FILE_INFORMATION_CLASS POINTER_ALIGNMENT FileInformationClass;
        } QueryFile;
        //
        // Parameters for IRP_MJ_SET_INFORMATION 
        //
        struct {
            ULONG Length;
            FILE_INFORMATION_CLASS POINTER_ALIGNMENT FileInformationClass;
            PFILE_OBJECT FileObject;
            union {
                struct {
                    BOOLEAN ReplaceIfExists;
                    BOOLEAN AdvanceOnly;
                };
                ULONG ClusterCount;
                HANDLE DeleteHandle;
            };
        } SetFile;
        //
        // Parameters for IRP_MJ_QUERY_VOLUME_INFORMATION 
        //
        struct {
            ULONG Length;
            FS_INFORMATION_CLASS POINTER_ALIGNMENT FsInformationClass;
        } QueryVolume;
        //
        // Parameters for IRP_MJ_DEVICE_CONTROL and IRP_MJ_INTERNAL_DEVICE_CONTROL 
        //
        struct {
            ULONG OutputBufferLength;
            ULONG POINTER_ALIGNMENT InputBufferLength;
            ULONG POINTER_ALIGNMENT IoControlCode;
            PVOID Type3InputBuffer;
        } DeviceIoControl;
        //
        // Nonsystem service parameters.
        //
        // Parameters for IRP_MN_MOUNT_VOLUME 
        //
        struct {
            PVOID DoNotUse1;
            PDEVICE_OBJECT DeviceObject;
        } MountVolume;
        //
        // Parameters for IRP_MN_VERIFY_VOLUME 
        //
        struct {
            PVOID DoNotUse1;
            PDEVICE_OBJECT DeviceObject;
        } VerifyVolume;
        //
        // Parameters for Scsi using IRP_MJ_INTERNAL_DEVICE_CONTROL 
        //
        struct {
            struct _SCSI_REQUEST_BLOCK *Srb;
        } Scsi;
        //
        // Parameters for IRP_MN_QUERY_DEVICE_RELATIONS 
        //
        struct {
            DEVICE_RELATION_TYPE Type;
        } QueryDeviceRelations;
        //
        // Parameters for IRP_MN_QUERY_INTERFACE 
        //
        struct {
            CONST GUID *InterfaceType;
            USHORT Size;
            USHORT Version;
            PINTERFACE Interface;
            PVOID InterfaceSpecificData;
        } QueryInterface;
        //
        // Parameters for IRP_MN_QUERY_CAPABILITIES 
        //
        struct {
            PDEVICE_CAPABILITIES Capabilities;
        } DeviceCapabilities;
        //
        // Parameters for IRP_MN_FILTER_RESOURCE_REQUIREMENTS 
        //
        struct {
            PIO_RESOURCE_REQUIREMENTS_LIST IoResourceRequirementList;
        } FilterResourceRequirements;
        //
        // Parameters for IRP_MN_READ_CONFIG and IRP_MN_WRITE_CONFIG 
        //
        struct {
            ULONG WhichSpace;
            PVOID Buffer;
            ULONG Offset;
            ULONG POINTER_ALIGNMENT Length;
        } ReadWriteConfig;
        //
        // Parameters for IRP_MN_SET_LOCK 
        //
        struct {
            BOOLEAN Lock;
        } SetLock;
        //
        // Parameters for IRP_MN_QUERY_ID 
        //
        struct {
            BUS_QUERY_ID_TYPE IdType;
        } QueryId;
        //
        // Parameters for IRP_MN_QUERY_DEVICE_TEXT 
        //
        struct {
            DEVICE_TEXT_TYPE DeviceTextType;
            LCID POINTER_ALIGNMENT LocaleId;
        } QueryDeviceText;
        //
        // Parameters for IRP_MN_DEVICE_USAGE_NOTIFICATION 
        //
        struct {
            BOOLEAN InPath;
            BOOLEAN Reserved[3];
            DEVICE_USAGE_NOTIFICATION_TYPE POINTER_ALIGNMENT Type;
        } UsageNotification;
        //
        // Parameters for IRP_MN_WAIT_WAKE 
        //
        struct {
            SYSTEM_POWER_STATE PowerState;
        } WaitWake;
        //
        // Parameter for IRP_MN_POWER_SEQUENCE 
        //
        struct {
            PPOWER_SEQUENCE PowerSequence;
        } PowerSequence;
        //
        // Parameters for IRP_MN_SET_POWER and IRP_MN_QUERY_POWER 
        //
        struct {
            ULONG SystemContext;
            POWER_STATE_TYPE POINTER_ALIGNMENT Type;
            POWER_STATE POINTER_ALIGNMENT State;
            POWER_ACTION POINTER_ALIGNMENT ShutdownType;
        } Power;
        //
        // Parameters for IRP_MN_START_DEVICE 
        //
        struct {
            PCM_RESOURCE_LIST AllocatedResources;
            PCM_RESOURCE_LIST AllocatedResourcesTranslated;
        } StartDevice;
        //
        // Parameters for WMI Minor IRPs 
        //
        struct {
            ULONG_PTR ProviderId;
            PVOID DataPath;
            ULONG BufferSize;
            PVOID Buffer;
        } WMI;
        //
        // Others - driver-specific
        //
        struct {
            PVOID Argument1;
            PVOID Argument2;
            PVOID Argument3;
            PVOID Argument4;
        } Others;
    } Parameters;
  PDEVICE_OBJECT  DeviceObject;
  PFILE_OBJECT  FileObject;
  .
  .
} IO_STACK_LOCATION, *PIO_STACK_LOCATION;