startio.c

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/*
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 *  Copyright 2004 Spiro Trikaliotis
 *
 */

#include <wdm.h>
#include "cbm_driver.h"

NTSTATUS
cbm_startio(IN PDEVICE_OBJECT Fdo, IN PIRP Irp)
{
    PIO_STACK_LOCATION irpSp;
    PDEVICE_EXTENSION pdx;
    NTSTATUS ntStatus;

    FUNC_ENTER();

    // get current stack location

    irpSp = IoGetCurrentIrpStackLocation(Irp);

    // get device extension

    pdx = Fdo->DeviceExtension;

    PERF_EVENT_STARTIO(Irp);

    // Execute the appropriate IRP

    switch (irpSp->MajorFunction)
    {
        case IRP_MJ_CREATE:
            ntStatus = cbm_execute_createopen(pdx, Irp);
            break;

        case IRP_MJ_CLOSE:
            ntStatus = cbm_execute_close(pdx, Irp);
            break;

        case IRP_MJ_READ:
            /* FALL THROUGH */

        case IRP_MJ_WRITE:
            ntStatus = cbm_execute_readwrite(pdx, Irp);
            break;

        case IRP_MJ_DEVICE_CONTROL:
        case IRP_MJ_INTERNAL_DEVICE_CONTROL:
            ntStatus = cbm_execute_devicecontrol(pdx, Irp);
            break;

        default:
            DBG_ERROR((DBG_PREFIX "THIS SHOULD NOT HAPPEN: UNKNOWN MAJORFUNCTION %08x", 
                irpSp->MajorFunction));
            DBG_ASSERT(1==0);
            ntStatus = STATUS_NOT_SUPPORTED;
    }

    FUNC_LEAVE_NTSTATUS(ntStatus);
}