reactos/drivers/fs/cdfs/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., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id: create.c,v 1.3 2002/05/09 15:53:02 ekohl Exp $
  20  *
  21  * COPYRIGHT:        See COPYING in the top level directory
  22  * PROJECT:          ReactOS kernel
  23  * FILE:             services/fs/cdfs/cdfs.c
  24  * PURPOSE:          CDROM (ISO 9660) filesystem driver
  25  * PROGRAMMER:       Art Yerkes
  26  * UPDATE HISTORY:
  27  */
  28
  29 /* INCLUDES *****************************************************************/
  30
  31 #include <ddk/ntddk.h>
  32
  33 #define NDEBUG
  34 #include <debug.h>
  35
  36 #include "cdfs.h"
  37
  38
  39 /* FUNCTIONS ****************************************************************/
  40
  41 static NTSTATUS
  42 CdfsMakeAbsoluteFilename(PFILE_OBJECT pFileObject,
  43                          PWSTR pRelativeFileName,
  44                          PWSTR *pAbsoluteFilename)
  45 {
  46   PWSTR rcName;
  47   PFCB Fcb;
  48   PCCB Ccb;
  49
  50   DPRINT("try related for %S\n", pRelativeFileName);
  51   Ccb = pFileObject->FsContext2;
  52   assert(Ccb);
  53   Fcb = Ccb->Fcb;
  54   assert(Fcb);
  55
  56   /* verify related object is a directory and target name
  57      don't start with \. */
  58   if (Fcb->Entry.FileFlags & 0x02 == 0 ||
  59       pRelativeFileName[0] == L'\\')
  60     {
  61       return(STATUS_INVALID_PARAMETER);
  62     }
  63
  64   /* construct absolute path name */
  65   assert(wcslen (Fcb->PathName) + 1 + wcslen (pRelativeFileName) + 1
  66           <= MAX_PATH);
  67   rcName = ExAllocatePool(NonPagedPool, MAX_PATH * sizeof(WCHAR));
  68   if (!rcName)
  69     {
  70       return(STATUS_INSUFFICIENT_RESOURCES);
  71     }
  72
  73   wcscpy(rcName, Fcb->PathName);
  74   if (!CdfsFCBIsRoot(Fcb))
  75     wcscat (rcName, L"\\");
  76   wcscat (rcName, pRelativeFileName);
  77   *pAbsoluteFilename = rcName;
  78
  79   return(STATUS_SUCCESS);
  80 }
  81
  82
  83 static NTSTATUS
  84 CdfsOpenFile(PDEVICE_EXTENSION DeviceExt,
  85              PFILE_OBJECT FileObject,
  86              PWSTR FileName)
  87 /*
  88  * FUNCTION: Opens a file
  89  */
  90 {
  91   PFCB ParentFcb;
  92   PFCB Fcb;
  93   NTSTATUS Status;
  94   PWSTR AbsFileName = NULL;
  95
  96   DPRINT("CdfsOpenFile(%08lx, %08lx, %S)\n", DeviceExt, FileObject, FileName);
  97
  98   if (FileObject->RelatedFileObject)
  99     {
 100       DPRINT("Converting relative filename to absolute filename\n");
 101
 102       Status = CdfsMakeAbsoluteFilename(FileObject->RelatedFileObject,
 103                                         FileName,
 104                                         &AbsFileName);
 105       FileName = AbsFileName;
 106       if (!NT_SUCCESS(Status))
 107         {
 108           return(Status);
 109         }
 110       return(STATUS_UNSUCCESSFUL);
 111     }
 112
 113   //FIXME: Get cannonical path name (remove .'s, ..'s and extra separators)
 114
 115   DPRINT("PathName to open: %S\n", FileName);
 116
 117   /*  try first to find an existing FCB in memory  */
 118   DPRINT("Checking for existing FCB in memory\n");
 119   Fcb = CdfsGrabFCBFromTable(DeviceExt,
 120                              FileName);
 121   if (Fcb == NULL)
 122     {
 123       DPRINT("No existing FCB found, making a new one if file exists.\n");
 124       Status = CdfsGetFCBForFile(DeviceExt,
 125                                  &ParentFcb,
 126                                  &Fcb,
 127                                  FileName);
 128       if (ParentFcb != NULL)
 129         {
 130           CdfsReleaseFCB(DeviceExt,
 131                          ParentFcb);
 132         }
 133
 134       if (!NT_SUCCESS (Status))
 135         {
 136           DPRINT("Could not make a new FCB, status: %x\n", Status);
 137
 138           if (AbsFileName)
 139             ExFreePool(AbsFileName);
 140
 141           return(Status);
 142         }
 143     }
 144
 145   DPRINT("Attaching FCB to fileObject\n");
 146   Status = CdfsAttachFCBToFileObject(DeviceExt,
 147                                      Fcb,
 148                                      FileObject);
 149
 150   if (AbsFileName)
 151     ExFreePool (AbsFileName);
 152
 153   return  Status;
 154 }
 155
 156
 157
 158
 159 static NTSTATUS
 160 CdfsCreateFile(PDEVICE_OBJECT DeviceObject,
 161                PIRP Irp)
 162 /*
 163  * FUNCTION: Opens a file
 164  */
 165 {
 166   PDEVICE_EXTENSION DeviceExt;
 167   PIO_STACK_LOCATION Stack;
 168   PFILE_OBJECT FileObject;
 169   ULONG RequestedDisposition;
 170   ULONG RequestedOptions;
 171   PFCB Fcb;
 172 //  PWSTR FileName;
 173   NTSTATUS Status;
 174
 175   DPRINT("CdfsCreateFile() called\n");
 176
 177   DeviceExt = DeviceObject->DeviceExtension;
 178   assert (DeviceExt);
 179   Stack = IoGetCurrentIrpStackLocation (Irp);
 180   assert (Stack);
 181
 182   RequestedDisposition = ((Stack->Parameters.Create.Options >> 24) & 0xff);
 183 //  RequestedOptions =
 184 //    Stack->Parameters.Create.Options & FILE_VALID_OPTION_FLAGS;
 185 //  PagingFileCreate = (Stack->Flags & SL_OPEN_PAGING_FILE) ? TRUE : FALSE;
 186 //  if ((RequestedOptions & FILE_DIRECTORY_FILE)
 187 //      && RequestedDisposition == FILE_SUPERSEDE)
 188 //    return STATUS_INVALID_PARAMETER;
 189
 190   FileObject = Stack->FileObject;
 191
 192   if (RequestedDisposition == FILE_CREATE ||
 193       RequestedDisposition == FILE_OVERWRITE_IF ||
 194       RequestedDisposition == FILE_SUPERSEDE)
 195     {
 196       return(STATUS_ACCESS_DENIED);
 197     }
 198
 199   Status = CdfsOpenFile(DeviceExt,
 200                         FileObject,
 201                         FileObject->FileName.Buffer);
 202
 203   /*
 204    * If the directory containing the file to open doesn't exist then
 205    * fail immediately
 206    */
 207   Irp->IoStatus.Information = (NT_SUCCESS(Status)) ? FILE_OPENED : 0;
 208   Irp->IoStatus.Status = Status;
 209
 210   return(Status);
 211 }
 212
 213
 214 NTSTATUS STDCALL
 215 CdfsCreate(PDEVICE_OBJECT DeviceObject,
 216            PIRP Irp)
 217 {
 218   PDEVICE_EXTENSION DeviceExt;
 219   NTSTATUS Status;
 220
 221   if (DeviceObject->Size == sizeof(DEVICE_OBJECT))
 222     {
 223       /* DeviceObject represents FileSystem instead of logical volume */
 224       DPRINT("FsdCreate called with file system\n");
 225       Irp->IoStatus.Information = FILE_OPENED;
 226       Status = STATUS_SUCCESS;
 227       goto ByeBye;
 228     }
 229
 230   DeviceExt = DeviceObject->DeviceExtension;
 231
 232   ExAcquireResourceExclusiveLite(&DeviceExt->DirResource,
 233                                  TRUE);
 234   Status = CdfsCreateFile(DeviceObject,
 235                           Irp);
 236   ExReleaseResourceLite(&DeviceExt->DirResource);
 237
 238
 239 ByeBye:
 240   Irp->IoStatus.Status = Status;
 241   IoCompleteRequest(Irp,
 242                     NT_SUCCESS(Status) ? IO_DISK_INCREMENT : IO_NO_INCREMENT);
 243
 244   return(Status);
 245 }
 246
 247 /* EOF */