reactos/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 /* FUNCTIONS ****************************************************************/
  35
  36 /*
  37  * FUNCTION: Used with IRP to set them to TopLevelIrp field
  38  * ARGUMENTS:
  39  *           Irp = The IRP to set
  40  * RETURNS: TRUE if top level was null, else FALSE
  41  */
  42 BOOLEAN
  43 NtfsIsIrpTopLevel(PIRP Irp)
  44 {
  45     BOOLEAN ReturnCode = FALSE;
  46
  47     TRACE_(NTFS, "NtfsIsIrpTopLevel()\n");
  48
  49     if (IoGetTopLevelIrp() == NULL)
  50     {
  51         IoSetTopLevelIrp(Irp);
  52         ReturnCode = TRUE;
  53     }
  54
  55     return ReturnCode;
  56 }
  57
  58 /*
  59  * FUNCTION: Allocate and fill an NTFS_IRP_CONTEXT struct in order to use it for IRP
  60  * ARGUMENTS:
  61  *           DeviceObject = Used to fill in struct
  62  *           Irp = The IRP that need IRP_CONTEXT struct
  63  * RETURNS: NULL or PNTFS_IRP_CONTEXT
  64  */
  65 PNTFS_IRP_CONTEXT
  66 NtfsAllocateIrpContext(PDEVICE_OBJECT DeviceObject,
  67                        PIRP Irp)
  68 {
  69     PNTFS_IRP_CONTEXT IrpContext;
  70     PIO_STACK_LOCATION IoStackLocation;
  71
  72     TRACE_(NTFS, "NtfsAllocateIrpContext()\n");
  73
  74     IrpContext = (PNTFS_IRP_CONTEXT)ExAllocatePoolWithTag(NonPagedPool,
  75                                                           sizeof(NTFS_IRP_CONTEXT),
  76                                                           'PRIN');
  77     if (IrpContext == NULL)
  78         return NULL;
  79
  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
  87     if (Irp)
  88     {
  89         IoStackLocation = IoGetCurrentIrpStackLocation(Irp);
  90         ASSERT(IoStackLocation);
  91
  92         IrpContext->MajorFunction = IoStackLocation->MajorFunction;
  93         IrpContext->MinorFunction = IoStackLocation->MinorFunction;
  94         IrpContext->IsTopLevel = (IoGetTopLevelIrp() == Irp);
  95     }
  96
  97     return IrpContext;
  98 }
  99
 100 /* See:
 101  -> http://msdn.microsoft.com/en-us/library/ms724228
 102  -> http://bos.asmhackers.net/docs/filesystems/ntfs/standard.html#layout
 103  */
 104 VOID
 105 NtfsDateTimeToFileTime(ULONGLONG NtfsTime,
 106                        PLARGE_INTEGER SystemTime)
 107 {
 108
 109     SystemTime->QuadPart = NtfsTime + 116444736000000000;
 110 }
 111
 112 /* EOF */