C++ (Cpp) FatIsTopLevelIrp示例

示例#1

文件： lock.c 项目： HBelusca/NasuTek-Odyssey

NTSTATUS
NTAPI
FatLockControl(PDEVICE_OBJECT DeviceObject, PIRP Irp)
{
    PFAT_IRP_CONTEXT IrpContext;
    NTSTATUS Status;
    BOOLEAN TopLevel;

    DPRINT1("FatLockControl()\n");

    /* Enter FsRtl critical region */
    FsRtlEnterFileSystem();

    /* Set Top Level IRP if not set */
    TopLevel = FatIsTopLevelIrp(Irp);

    /* Build an irp context */
    IrpContext = FatBuildIrpContext(Irp, IoIsOperationSynchronous(Irp));

    /* Call internal function */
    Status = FatiLockControl(IrpContext, Irp);

    /* Reset Top Level IRP */
    if (TopLevel) IoSetTopLevelIrp(NULL);

    /* Leave FsRtl critical region */
    FsRtlExitFileSystem();

    return Status;
}

示例#2

文件： rw.c 项目： hoangduit/reactos

NTSTATUS
NTAPI
FatRead(PDEVICE_OBJECT DeviceObject, PIRP Irp)
{
    NTSTATUS Status;
    BOOLEAN TopLevel, CanWait;
    PFAT_IRP_CONTEXT IrpContext;

    CanWait = TRUE;
    TopLevel = FALSE;
    Status = STATUS_INVALID_DEVICE_REQUEST;
    /* Get CanWait flag */
    if (IoGetCurrentIrpStackLocation(Irp)->FileObject != NULL)
        CanWait = IoIsOperationSynchronous(Irp);

    /* Enter FsRtl critical region */
    FsRtlEnterFileSystem();

    if (DeviceObject != FatGlobalData.DiskDeviceObject)
    {
        /* Set Top Level IRP if not set */
        TopLevel = FatIsTopLevelIrp(Irp);

        /* Build an irp context */
        IrpContext = FatBuildIrpContext(Irp, CanWait);

        /* Perform the actual read */
        Status = FatiRead(IrpContext);

        /* Restore top level Irp */
        if (TopLevel)
            IoSetTopLevelIrp(NULL);
    }
    /* Leave FsRtl critical region */
    FsRtlExitFileSystem();

    return Status;
}