fxioqueuekm.hpp

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/*++
 
  Copyright (c) Microsoft Corporation
 
  Module Name:
 
  FxIoQueueKm.hpp
 
  Abstract:
 
  This module implements km specific functions for FxIoQueue.
 
  Author:
 
 
 
  Environment:
 
  Kernel mode only
 
  Revision History:
 
  --*/
 
#ifndef _FXIOQUEUEKM_HPP_
#define _FXIOQUEUEKM_HPP_
 
__inline
BOOLEAN
FxIoQueue::IsPagingIo(
    __in MdIrp Irp
    )
/*++
 
  Routine Description:
  Paging IO is treated especially depending on what Forward Progress policy
  was set on the Queue
  --*/
{
    //
    // NOTE: IRP_INPUT_OPERATION has the same value as IRP_SYNCHRONOUS_PAGING_IO
    // and IRP_MOUNT_COMPLETION the same as  IRP_PAGING_IO  so how does one know if
    // the IO is a paging IO ?
    //
 
    // One can assume that if IRP_PAGING_IO is set and the MJ code is not
    // FILE_SYSTEM_CONTROL then it is a paging I/O.
    //
    if (Irp->Flags & IRP_PAGING_IO) {
      if (IoGetCurrentIrpStackLocation(Irp)->MajorFunction
    != IRP_MJ_FILE_SYSTEM_CONTROL) {
        return  TRUE;
      }
    }
 
    return FALSE;
}
 
#endif // _FXIOQUEUEKM_HPP