reactos/drivers/fs/cdfs/create.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 2002, 2003 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 1.11 2003/11/13 15:25:08 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  *                   Eric Kohl
  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
  49   DPRINT("try related for %S\n", pRelativeFileName);
  50   Fcb = pFileObject->FsContext;
  51   assert(Fcb);
  52
  53   /* verify related object is a directory and target name
  54      don't start with \. */
  55   if ((Fcb->Entry.FileFlags & 0x02) == 0 ||
  56       pRelativeFileName[0] == L'\\')
  57     {
  58       return(STATUS_INVALID_PARAMETER);
  59     }
  60
  61   /* construct absolute path name */
  62   assert(wcslen (Fcb->PathName) + 1 + wcslen (pRelativeFileName) + 1
  63           <= MAX_PATH);
  64   rcName = ExAllocatePool(NonPagedPool, MAX_PATH * sizeof(WCHAR));
  65   if (!rcName)
  66     {
  67       return(STATUS_INSUFFICIENT_RESOURCES);
  68     }
  69
  70   wcscpy(rcName, Fcb->PathName);
  71   if (!CdfsFCBIsRoot(Fcb))
  72     wcscat (rcName, L"\\");
  73   wcscat (rcName, pRelativeFileName);
  74   *pAbsoluteFilename = rcName;
  75
  76   return(STATUS_SUCCESS);
  77 }
  78
  79
  80 static NTSTATUS
  81 CdfsOpenFile(PDEVICE_EXTENSION DeviceExt,
  82              PFILE_OBJECT FileObject,
  83              PWSTR FileName)
  84 /*
  85  * FUNCTION: Opens a file
  86  */
  87 {
  88   PFCB ParentFcb;
  89   PFCB Fcb;
  90   NTSTATUS Status;
  91   PWSTR AbsFileName = NULL;
  92
  93   DPRINT("CdfsOpenFile(%08lx, %08lx, %S)\n", DeviceExt, FileObject, FileName);
  94
  95   if (FileObject->RelatedFileObject)
  96     {
  97       DPRINT("Converting relative filename to absolute filename\n");
  98
  99       Status = CdfsMakeAbsoluteFilename(FileObject->RelatedFileObject,
 100                                         FileName,
 101                                         &AbsFileName);
 102       FileName = AbsFileName;
 103       if (!NT_SUCCESS(Status))
 104         {
 105           return Status;
 106         }
 107
 108       return STATUS_UNSUCCESSFUL;
 109     }
 110
 111   Status = CdfsDeviceIoControl (DeviceExt->StorageDevice,
 112                                 IOCTL_CDROM_CHECK_VERIFY,
 113                                 NULL,
 114                                 0,
 115                                 NULL,
 116                                 0,
 117                                 TRUE);
 118   DPRINT ("Status %lx\n", Status);
 119   if (Status == STATUS_VERIFY_REQUIRED)
 120     {
 121       PDEVICE_OBJECT DeviceToVerify;
 122
 123       DPRINT1 ("Media change detected!\n");
 124       DPRINT1 ("Device %p\n", DeviceExt->VolumeDevice);
 125
 126       DeviceToVerify = IoGetDeviceToVerify (PsGetCurrentThread ());
 127       IoSetDeviceToVerify (PsGetCurrentThread (),
 128                            NULL);
 129
 130       Status = IoVerifyVolume (DeviceToVerify,
 131                                FALSE);
 132       if (!NT_SUCCESS(Status))
 133         {
 134           DPRINT1 ("Status %lx\n", Status);
 135           return Status;
 136         }
 137     }
 138   else if (!NT_SUCCESS(Status))
 139     {
 140       DPRINT1 ("Status %lx\n", Status);
 141       return Status;
 142     }
 143
 144   //FIXME: Get cannonical path name (remove .'s, ..'s and extra separators)
 145
 146   DPRINT("PathName to open: %S\n", FileName);
 147
 148   /*  try first to find an existing FCB in memory  */
 149   DPRINT("Checking for existing FCB in memory\n");
 150   Fcb = CdfsGrabFCBFromTable(DeviceExt,
 151                              FileName);
 152   if (Fcb == NULL)
 153     {
 154       DPRINT("No existing FCB found, making a new one if file exists.\n");
 155       Status = CdfsGetFCBForFile(DeviceExt,
 156                                  &ParentFcb,
 157                                  &Fcb,
 158                                  FileName);
 159       if (ParentFcb != NULL)
 160         {
 161           CdfsReleaseFCB(DeviceExt,
 162                          ParentFcb);
 163         }
 164
 165       if (!NT_SUCCESS (Status))
 166         {
 167           DPRINT("Could not make a new FCB, status: %x\n", Status);
 168
 169           if (AbsFileName)
 170             ExFreePool(AbsFileName);
 171
 172           return(Status);
 173         }
 174     }
 175
 176   DPRINT("Attaching FCB to fileObject\n");
 177   Status = CdfsAttachFCBToFileObject(DeviceExt,
 178                                      Fcb,
 179                                      FileObject);
 180
 181   if (AbsFileName)
 182     ExFreePool (AbsFileName);
 183
 184   return Status;
 185 }
 186
 187
 188 static NTSTATUS
 189 CdfsCreateFile(PDEVICE_OBJECT DeviceObject,
 190                PIRP Irp)
 191 /*
 192  * FUNCTION: Opens a file
 193  */
 194 {
 195   PDEVICE_EXTENSION DeviceExt;
 196   PIO_STACK_LOCATION Stack;
 197   PFILE_OBJECT FileObject;
 198   ULONG RequestedDisposition;
 199   ULONG RequestedOptions;
 200   PFCB Fcb;
 201 //  PWSTR FileName;
 202   NTSTATUS Status;
 203
 204   DPRINT("CdfsCreateFile() called\n");
 205
 206   DeviceExt = DeviceObject->DeviceExtension;
 207   assert (DeviceExt);
 208   Stack = IoGetCurrentIrpStackLocation (Irp);
 209   assert (Stack);
 210
 211   RequestedDisposition = ((Stack->Parameters.Create.Options >> 24) & 0xff);
 212   RequestedOptions = Stack->Parameters.Create.Options & FILE_VALID_OPTION_FLAGS;
 213   DPRINT("RequestedDisposition %x, RequestedOptions %x\n",
 214          RequestedDisposition, RequestedOptions);
 215
 216   FileObject = Stack->FileObject;
 217
 218   if (RequestedDisposition == FILE_CREATE ||
 219       RequestedDisposition == FILE_OVERWRITE_IF ||
 220       RequestedDisposition == FILE_SUPERSEDE)
 221     {
 222       return(STATUS_ACCESS_DENIED);
 223     }
 224
 225   Status = CdfsOpenFile(DeviceExt,
 226                         FileObject,
 227                         FileObject->FileName.Buffer);
 228
 229   if (NT_SUCCESS(Status))
 230     {
 231       Fcb = FileObject->FsContext;
 232
 233       /* Check whether the file has the requested attributes */
 234       if (RequestedOptions & FILE_NON_DIRECTORY_FILE && CdfsFCBIsDirectory(Fcb))
 235         {
 236           CdfsCloseFile (DeviceExt, FileObject);
 237           return STATUS_FILE_IS_A_DIRECTORY;
 238         }
 239
 240       if (RequestedOptions & FILE_DIRECTORY_FILE && !CdfsFCBIsDirectory(Fcb))
 241         {
 242           CdfsCloseFile (DeviceExt, FileObject);
 243           return STATUS_NOT_A_DIRECTORY;
 244         }
 245   }
 246
 247   /*
 248    * If the directory containing the file to open doesn't exist then
 249    * fail immediately
 250    */
 251   Irp->IoStatus.Information = (NT_SUCCESS(Status)) ? FILE_OPENED : 0;
 252   Irp->IoStatus.Status = Status;
 253
 254   return Status;
 255 }
 256
 257
 258 NTSTATUS STDCALL
 259 CdfsCreate(PDEVICE_OBJECT DeviceObject,
 260            PIRP Irp)
 261 {
 262   PDEVICE_EXTENSION DeviceExt;
 263   NTSTATUS Status;
 264
 265   if (DeviceObject == CdfsGlobalData->DeviceObject)
 266     {
 267       /* DeviceObject represents FileSystem instead of logical volume */
 268       DPRINT("Opening file system\n");
 269       Irp->IoStatus.Information = FILE_OPENED;
 270       Status = STATUS_SUCCESS;
 271       goto ByeBye;
 272     }
 273
 274   DeviceExt = DeviceObject->DeviceExtension;
 275
 276   ExAcquireResourceExclusiveLite(&DeviceExt->DirResource,
 277                                  TRUE);
 278   Status = CdfsCreateFile(DeviceObject,
 279                           Irp);
 280   ExReleaseResourceLite(&DeviceExt->DirResource);
 281
 282 ByeBye:
 283   Irp->IoStatus.Status = Status;
 284   IoCompleteRequest(Irp,
 285                     NT_SUCCESS(Status) ? IO_DISK_INCREMENT : IO_NO_INCREMENT);
 286
 287   return Status;
 288 }
 289
 290 /* EOF */