drivers/filesystems/ntfs/create.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 2002 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/create.c
  22  * PURPOSE:          NTFS filesystem driver
  23  * PROGRAMMER:       Eric Kohl
  24  */
  25
  26 /* INCLUDES *****************************************************************/
  27
  28 #include "ntfs.h"
  29
  30 #define NDEBUG
  31 #include <debug.h>
  32
  33 /* GLOBALS *****************************************************************/
  34
  35
  36 /* FUNCTIONS ****************************************************************/
  37
  38 static NTSTATUS
  39 NtfsMakeAbsoluteFilename(PFILE_OBJECT pFileObject,
  40                          PWSTR pRelativeFileName,
  41                          PWSTR *pAbsoluteFilename)
  42 {
  43   PWSTR rcName;
  44   PNTFS_FCB Fcb;
  45
  46   DPRINT("try related for %S\n", pRelativeFileName);
  47   Fcb = pFileObject->FsContext;
  48   ASSERT(Fcb);
  49
  50   /* verify related object is a directory and target name
  51      don't start with \. */
  52   if (NtfsFCBIsDirectory(Fcb) == FALSE ||
  53       pRelativeFileName[0] == L'\\')
  54     {
  55       return(STATUS_INVALID_PARAMETER);
  56     }
  57
  58   /* construct absolute path name */
  59   ASSERT(wcslen (Fcb->PathName) + 1 + wcslen (pRelativeFileName) + 1
  60           <= MAX_PATH);
  61   rcName = ExAllocatePoolWithTag(NonPagedPool, MAX_PATH * sizeof(WCHAR), TAG_NTFS);
  62   if (!rcName)
  63     {
  64       return(STATUS_INSUFFICIENT_RESOURCES);
  65     }
  66
  67   wcscpy(rcName, Fcb->PathName);
  68   if (!NtfsFCBIsRoot(Fcb))
  69     wcscat (rcName, L"\\");
  70   wcscat (rcName, pRelativeFileName);
  71   *pAbsoluteFilename = rcName;
  72
  73   return(STATUS_SUCCESS);
  74 }
  75
  76
  77 static NTSTATUS
  78 NtfsOpenFile(PDEVICE_EXTENSION DeviceExt,
  79              PFILE_OBJECT FileObject,
  80              PWSTR FileName)
  81 /*
  82  * FUNCTION: Opens a file
  83  */
  84 {
  85   PNTFS_FCB ParentFcb;
  86   PNTFS_FCB Fcb;
  87   NTSTATUS Status;
  88   PWSTR AbsFileName = NULL;
  89
  90   DPRINT("NtfsOpenFile(%p, %p, %S)\n", DeviceExt, FileObject, FileName);
  91
  92   if (FileObject->RelatedFileObject)
  93     {
  94       DPRINT("Converting relative filename to absolute filename\n");
  95
  96       Status = NtfsMakeAbsoluteFilename(FileObject->RelatedFileObject,
  97                                         FileName,
  98                                         &AbsFileName);
  99       FileName = AbsFileName;
 100       if (!NT_SUCCESS(Status))
 101         {
 102           return(Status);
 103         }
 104       return(STATUS_UNSUCCESSFUL);
 105     }
 106
 107   //FIXME: Get cannonical path name (remove .'s, ..'s and extra separators)
 108
 109   DPRINT("PathName to open: %S\n", FileName);
 110
 111   /*  try first to find an existing FCB in memory  */
 112   DPRINT("Checking for existing FCB in memory\n");
 113   Fcb = NtfsGrabFCBFromTable(DeviceExt,
 114                              FileName);
 115   if (Fcb == NULL)
 116     {
 117       DPRINT("No existing FCB found, making a new one if file exists.\n");
 118       Status = NtfsGetFCBForFile(DeviceExt,
 119                                  &ParentFcb,
 120                                  &Fcb,
 121                                  FileName);
 122       if (ParentFcb != NULL)
 123         {
 124           NtfsReleaseFCB(DeviceExt,
 125                          ParentFcb);
 126         }
 127
 128       if (!NT_SUCCESS (Status))
 129         {
 130           DPRINT("Could not make a new FCB, status: %x\n", Status);
 131
 132           if (AbsFileName)
 133             ExFreePool(AbsFileName);
 134
 135           return(Status);
 136         }
 137     }
 138
 139   DPRINT("Attaching FCB to fileObject\n");
 140   Status = NtfsAttachFCBToFileObject(DeviceExt,
 141                                      Fcb,
 142                                      FileObject);
 143
 144   if (AbsFileName)
 145     ExFreePool (AbsFileName);
 146
 147   return(Status);
 148 }
 149
 150
 151 static NTSTATUS
 152 NtfsCreateFile(PDEVICE_OBJECT DeviceObject,
 153                PIRP Irp)
 154 /*
 155  * FUNCTION: Opens a file
 156  */
 157 {
 158   PDEVICE_EXTENSION DeviceExt;
 159   PIO_STACK_LOCATION Stack;
 160   PFILE_OBJECT FileObject;
 161   ULONG RequestedDisposition;
 162 //  ULONG RequestedOptions;
 163 //  PFCB Fcb;
 164 //  PWSTR FileName;
 165   NTSTATUS Status;
 166
 167   DPRINT("NtfsCreateFile() called\n");
 168
 169   DeviceExt = DeviceObject->DeviceExtension;
 170   ASSERT(DeviceExt);
 171   Stack = IoGetCurrentIrpStackLocation (Irp);
 172   ASSERT(Stack);
 173
 174   RequestedDisposition = ((Stack->Parameters.Create.Options >> 24) & 0xff);
 175 //  RequestedOptions =
 176 //    Stack->Parameters.Create.Options & FILE_VALID_OPTION_FLAGS;
 177 //  PagingFileCreate = (Stack->Flags & SL_OPEN_PAGING_FILE) ? TRUE : FALSE;
 178 //  if ((RequestedOptions & FILE_DIRECTORY_FILE)
 179 //      && RequestedDisposition == FILE_SUPERSEDE)
 180 //    return STATUS_INVALID_PARAMETER;
 181
 182   FileObject = Stack->FileObject;
 183
 184   if (RequestedDisposition == FILE_CREATE ||
 185       RequestedDisposition == FILE_OVERWRITE_IF ||
 186       RequestedDisposition == FILE_SUPERSEDE)
 187     {
 188       return(STATUS_ACCESS_DENIED);
 189     }
 190
 191   Status = NtfsOpenFile(DeviceExt,
 192                         FileObject,
 193                         FileObject->FileName.Buffer);
 194
 195   /*
 196    * If the directory containing the file to open doesn't exist then
 197    * fail immediately
 198    */
 199   Irp->IoStatus.Information = (NT_SUCCESS(Status)) ? FILE_OPENED : 0;
 200   Irp->IoStatus.Status = Status;
 201
 202   return(Status);
 203 }
 204
 205
 206 NTSTATUS NTAPI
 207 NtfsFsdCreate(PDEVICE_OBJECT DeviceObject,
 208            PIRP Irp)
 209 {
 210   PDEVICE_EXTENSION DeviceExt;
 211   NTSTATUS Status;
 212
 213   if (DeviceObject == NtfsGlobalData->DeviceObject)
 214     {
 215       /* DeviceObject represents FileSystem instead of logical volume */
 216       DPRINT("Opening file system\n");
 217       Irp->IoStatus.Information = FILE_OPENED;
 218       Status = STATUS_SUCCESS;
 219       goto ByeBye;
 220     }
 221
 222   DeviceExt = DeviceObject->DeviceExtension;
 223
 224   FsRtlEnterFileSystem();
 225   ExAcquireResourceExclusiveLite(&DeviceExt->DirResource,
 226                                  TRUE);
 227   Status = NtfsCreateFile(DeviceObject,
 228                           Irp);
 229   ExReleaseResourceLite(&DeviceExt->DirResource);
 230   FsRtlExitFileSystem();
 231
 232 ByeBye:
 233   Irp->IoStatus.Status = Status;
 234   IoCompleteRequest(Irp,
 235                     NT_SUCCESS(Status) ? IO_DISK_INCREMENT : IO_NO_INCREMENT);
 236
 237   return(Status);
 238 }
 239
 240 /* EOF */