fxdefaultirphandler.cpp

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/*++

Copyright (c) Microsoft Corporation

Module Name:

    FxDefaultIrpHandler.cpp

Abstract:

    This module implements the default handler for IRPs that WDF does not handle
    automatically for an FxDevice

Author:



Environment:

    Both kernel and user mode

Revision History:

--*/

#if ((FX_CORE_MODE)==(FX_CORE_USER_MODE))
#define FX_IS_USER_MODE (TRUE)
#define FX_IS_KERNEL_MODE (FALSE)
#elif ((FX_CORE_MODE)==(FX_CORE_KERNEL_MODE))
#define FX_IS_USER_MODE (FALSE)
#define FX_IS_KERNEL_MODE (TRUE)
#endif

extern "C" {
#include "mx.h"
}
#include "fxmin.hpp"

extern "C" {
// #include "FxDefaultIrpHandler.tmh"
}

FxDefaultIrpHandler::FxDefaultIrpHandler(
    __in PFX_DRIVER_GLOBALS FxDriverGlobals,
    __in CfxDevice *Device
    ) :
    FxPackage(FxDriverGlobals, Device, FX_TYPE_DEFAULT_IRP_HANDLER)
{
}

_Must_inspect_result_
NTSTATUS
FxDefaultIrpHandler::Dispatch(
    __in MdIrp Irp
    )
{
    UCHAR major, minor;
    FxIrp fxIrp(Irp);

    major = fxIrp.GetMajorFunction();
    minor = fxIrp.GetMinorFunction();

    if (FxDevice::_RequiresRemLock(major, minor) == FxDeviceRemLockRequired) {
        if (major == IRP_MJ_POWER) {
            //
            // Required to be called before the power irp is completed
            //
            fxIrp.StartNextPowerIrp();
        }

        fxIrp.SetStatus(STATUS_INVALID_DEVICE_REQUEST);
        fxIrp.SetInformation(0);

        fxIrp.CompleteRequest(IO_NO_INCREMENT);

        //
        // If we are in this function, m_Device is still valid, so we can use it
        // to get the WDM remove lock and not have to get it out of the
        // device object from current irp stack location.
        //
        Mx::MxReleaseRemoveLock(m_Device->GetRemoveLock(), Irp);

        return STATUS_INVALID_DEVICE_REQUEST;
    }

    if (m_Device->IsFilter()) {
        fxIrp.SkipCurrentIrpStackLocation();
        return fxIrp.CallDriver(m_Device->GetAttachedDevice());
    }
    else {
        fxIrp.SetStatus(STATUS_INVALID_DEVICE_REQUEST);
        fxIrp.SetInformation(0);

        fxIrp.CompleteRequest(IO_NO_INCREMENT);
        return STATUS_INVALID_DEVICE_REQUEST;
    }
}