drivers/filesystems/ntfs/misc.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 2008 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
  18  *
  19  * COPYRIGHT:        See COPYING in the top level directory
  20  * PROJECT:          ReactOS kernel
  21  * FILE:             drivers/filesystem/ntfs/misc.c
  22  * PURPOSE:          NTFS filesystem driver
  23  * PROGRAMMER:       Pierre Schweitzer
  24  * UPDATE HISTORY:
  25  */
  26
  27 /* INCLUDES *****************************************************************/
  28
  29 #include "ntfs.h"
  30
  31 #define NDEBUG
  32 #include <debug.h>
  33
  34 /* GLOBALS *****************************************************************/
  35
  36
  37 /* FUNCTIONS ****************************************************************/
  38
  39 /*
  40  * FUNCTION: Used with IRP to set them to TopLevelIrp field
  41  * ARGUMENTS:
  42  *           Irp = The IRP to set
  43  * RETURNS: TRUE if top level was null, else FALSE
  44  */
  45 BOOLEAN
  46 NtfsIsIrpTopLevel(PIRP Irp)
  47 {
  48   BOOLEAN       ReturnCode = FALSE;
  49
  50   TRACE_(NTFS, "NtfsIsIrpTopLevel()\n");
  51
  52   if (IoGetTopLevelIrp() == NULL)
  53   {
  54     IoSetTopLevelIrp(Irp);
  55     ReturnCode = TRUE;
  56   }
  57
  58   return ReturnCode;
  59 }
  60
  61 /*
  62  * FUNCTION: Allocate and fill an NTFS_IRP_CONTEXT struct in order to use it for IRP
  63  * ARGUMENTS:
  64  *           DeviceObject = Used to fill in struct
  65  *           Irp = The IRP that need IRP_CONTEXT struct
  66  * RETURNS: NULL or PNTFS_IRP_CONTEXT
  67  */
  68 PNTFS_IRP_CONTEXT
  69 NtfsAllocateIrpContext(PDEVICE_OBJECT DeviceObject,
  70                        PIRP Irp)
  71 {
  72   PNTFS_IRP_CONTEXT IrpContext;
  73   PIO_STACK_LOCATION IoStackLocation;
  74
  75   TRACE_(NTFS, "NtfsAllocateIrpContext()\n");
  76
  77   IrpContext = (PNTFS_IRP_CONTEXT)ExAllocatePoolWithTag(NonPagedPool, sizeof(NTFS_IRP_CONTEXT), 'PRIN');
  78   if (IrpContext == NULL)
  79     return NULL;
  80   RtlZeroMemory(IrpContext, sizeof(NTFS_IRP_CONTEXT));
  81
  82   IrpContext->Identifier.Type = NTFS_TYPE_IRP_CONTEST;
  83   IrpContext->Identifier.Size = sizeof(NTFS_IRP_CONTEXT);
  84   IrpContext->Irp = Irp;
  85   IrpContext->DeviceObject = DeviceObject;
  86   if (Irp)
  87   {
  88     IoStackLocation = IoGetCurrentIrpStackLocation(Irp);
  89     ASSERT(IoStackLocation);
  90
  91     IrpContext->MajorFunction = IoStackLocation->MajorFunction;
  92     IrpContext->MinorFunction = IoStackLocation->MinorFunction;
  93     IrpContext->IsTopLevel = (IoGetTopLevelIrp() == Irp);
  94   }
  95
  96   return IrpContext;
  97 }