drivers/filesystems/ntfs/create.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 2002, 2014 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  * PROGRAMMERS:      Eric Kohl
  24  *                   Pierre Schweitzer (pierre@reactos.org)
  25  */
  26
  27 /* INCLUDES *****************************************************************/
  28
  29 #include "ntfs.h"
  30
  31 #define NDEBUG
  32 #include <debug.h>
  33
  34 /* FUNCTIONS ****************************************************************/
  35
  36 static
  37 NTSTATUS
  38 NtfsMakeAbsoluteFilename(PFILE_OBJECT pFileObject,
  39                          PWSTR pRelativeFileName,
  40                          PWSTR *pAbsoluteFilename)
  41 {
  42     PWSTR rcName;
  43     PNTFS_FCB Fcb;
  44
  45     DPRINT("try related for %S\n", pRelativeFileName);
  46     Fcb = pFileObject->FsContext;
  47     ASSERT(Fcb);
  48
  49     /* verify related object is a directory and target name
  50        don't start with \. */
  51     if (NtfsFCBIsDirectory(Fcb) == FALSE ||
  52         pRelativeFileName[0] == L'\\')
  53     {
  54         return STATUS_INVALID_PARAMETER;
  55     }
  56
  57     /* construct absolute path name */
  58     ASSERT(wcslen (Fcb->PathName) + 1 + wcslen (pRelativeFileName) + 1 <= MAX_PATH);
  59     rcName = ExAllocatePoolWithTag(NonPagedPool, MAX_PATH * sizeof(WCHAR), TAG_NTFS);
  60     if (!rcName)
  61     {
  62         return STATUS_INSUFFICIENT_RESOURCES;
  63     }
  64
  65     wcscpy(rcName, Fcb->PathName);
  66     if (!NtfsFCBIsRoot(Fcb))
  67         wcscat (rcName, L"\\");
  68     wcscat (rcName, pRelativeFileName);
  69     *pAbsoluteFilename = rcName;
  70
  71     return STATUS_SUCCESS;
  72 }
  73
  74
  75 /*
  76  * FUNCTION: Opens a file
  77  */
  78 static
  79 NTSTATUS
  80 NtfsOpenFile(PDEVICE_EXTENSION DeviceExt,
  81              PFILE_OBJECT FileObject,
  82              PWSTR FileName,
  83              PNTFS_FCB * FoundFCB)
  84 {
  85     PNTFS_FCB ParentFcb;
  86     PNTFS_FCB Fcb;
  87     NTSTATUS Status;
  88     PWSTR AbsFileName = NULL;
  89
  90     DPRINT1("NtfsOpenFile(%p, %p, %S, %p)\n", DeviceExt, FileObject, FileName, FoundFCB);
  91
  92     *FoundFCB = NULL;
  93
  94     if (FileObject->RelatedFileObject)
  95     {
  96         DPRINT("Converting relative filename to absolute filename\n");
  97
  98         Status = NtfsMakeAbsoluteFilename(FileObject->RelatedFileObject,
  99                                           FileName,
 100                                           &AbsFileName);
 101         FileName = AbsFileName;
 102         if (!NT_SUCCESS(Status))
 103         {
 104             return Status;
 105         }
 106
 107         return STATUS_UNSUCCESSFUL;
 108     }
 109
 110     //FIXME: Get cannonical path name (remove .'s, ..'s and extra separators)
 111
 112     DPRINT("PathName to open: %S\n", FileName);
 113
 114     /*  try first to find an existing FCB in memory  */
 115     DPRINT("Checking for existing FCB in memory\n");
 116     Fcb = NtfsGrabFCBFromTable(DeviceExt,
 117                                FileName);
 118     if (Fcb == NULL)
 119     {
 120         DPRINT("No existing FCB found, making a new one if file exists.\n");
 121         Status = NtfsGetFCBForFile(DeviceExt,
 122                                    &ParentFcb,
 123                                    &Fcb,
 124                                    FileName);
 125         if (ParentFcb != NULL)
 126         {
 127             NtfsReleaseFCB(DeviceExt,
 128                            ParentFcb);
 129         }
 130
 131         if (!NT_SUCCESS (Status))
 132         {
 133             DPRINT("Could not make a new FCB, status: %x\n", Status);
 134
 135             if (AbsFileName)
 136                 ExFreePool(AbsFileName);
 137
 138             return Status;
 139         }
 140     }
 141
 142     DPRINT("Attaching FCB to fileObject\n");
 143     Status = NtfsAttachFCBToFileObject(DeviceExt,
 144                                        Fcb,
 145                                        FileObject);
 146
 147     if (AbsFileName)
 148         ExFreePool(AbsFileName);
 149
 150     *FoundFCB = Fcb;
 151
 152     return Status;
 153 }
 154
 155
 156 /*
 157  * FUNCTION: Opens a file
 158  */
 159 static
 160 NTSTATUS
 161 NtfsCreateFile(PDEVICE_OBJECT DeviceObject,
 162                PIRP Irp)
 163 {
 164     PDEVICE_EXTENSION DeviceExt;
 165     PIO_STACK_LOCATION Stack;
 166     PFILE_OBJECT FileObject;
 167     ULONG RequestedDisposition;
 168     ULONG RequestedOptions;
 169     PNTFS_FCB Fcb;
 170 //    PWSTR FileName;
 171     NTSTATUS Status;
 172
 173     DPRINT1("NtfsCreateFile(%p, %p) called\n", DeviceObject, Irp);
 174
 175     DeviceExt = DeviceObject->DeviceExtension;
 176     ASSERT(DeviceExt);
 177     Stack = IoGetCurrentIrpStackLocation (Irp);
 178     ASSERT(Stack);
 179
 180     RequestedDisposition = ((Stack->Parameters.Create.Options >> 24) & 0xff);
 181     RequestedOptions = Stack->Parameters.Create.Options & FILE_VALID_OPTION_FLAGS;
 182 //  PagingFileCreate = (Stack->Flags & SL_OPEN_PAGING_FILE) ? TRUE : FALSE;
 183     if (RequestedOptions & FILE_DIRECTORY_FILE &&
 184         RequestedDisposition == FILE_SUPERSEDE)
 185     {
 186         return STATUS_INVALID_PARAMETER;
 187     }
 188
 189     FileObject = Stack->FileObject;
 190
 191     if (RequestedDisposition == FILE_CREATE ||
 192         RequestedDisposition == FILE_OVERWRITE_IF ||
 193         RequestedDisposition == FILE_SUPERSEDE)
 194     {
 195         return STATUS_ACCESS_DENIED;
 196     }
 197
 198     /* This a open operation for the volume itself */
 199     if (FileObject->FileName.Length == 0 &&
 200         (FileObject->RelatedFileObject == NULL || FileObject->RelatedFileObject->FsContext2 != NULL))
 201     {
 202         if (RequestedDisposition != FILE_OPEN &&
 203             RequestedDisposition != FILE_OPEN_IF)
 204         {
 205             return STATUS_ACCESS_DENIED;
 206         }
 207
 208         if (RequestedOptions & FILE_DIRECTORY_FILE)
 209         {
 210             return STATUS_NOT_A_DIRECTORY;
 211         }
 212
 213         NtfsAttachFCBToFileObject(DeviceExt, DeviceExt->VolumeFcb, FileObject);
 214         DeviceExt->VolumeFcb->RefCount++;
 215
 216         Irp->IoStatus.Information = FILE_OPENED;
 217         return STATUS_SUCCESS;
 218     }
 219
 220     Status = NtfsOpenFile(DeviceExt,
 221                           FileObject,
 222                           FileObject->FileName.Buffer,
 223                           &Fcb);
 224
 225     if (NT_SUCCESS(Status))
 226     {
 227         if (RequestedDisposition == FILE_CREATE)
 228         {
 229             Irp->IoStatus.Information = FILE_EXISTS;
 230             NtfsCloseFile(DeviceExt, FileObject);
 231             return STATUS_OBJECT_NAME_COLLISION;
 232         }
 233
 234         if (RequestedOptions & FILE_NON_DIRECTORY_FILE &&
 235             NtfsFCBIsDirectory(Fcb))
 236         {
 237             NtfsCloseFile(DeviceExt, FileObject);
 238             return STATUS_FILE_IS_A_DIRECTORY;
 239         }
 240
 241         if (RequestedOptions & FILE_DIRECTORY_FILE &&
 242             !NtfsFCBIsDirectory(Fcb))
 243         {
 244             NtfsCloseFile(DeviceExt, FileObject);
 245             return STATUS_NOT_A_DIRECTORY;
 246         }
 247
 248         /* HUGLY HACK: remain RO so far... */
 249         if (RequestedDisposition == FILE_OVERWRITE ||
 250             RequestedDisposition == FILE_OVERWRITE_IF ||
 251             RequestedDisposition == FILE_SUPERSEDE)
 252         {
 253             DPRINT1("Denying write request on NTFS volume\n");
 254             NtfsCloseFile(DeviceExt, FileObject);
 255             return STATUS_ACCESS_DENIED;
 256         }
 257     }
 258     else
 259     {
 260         /* HUGLY HACK: remain RO so far... */
 261         if (RequestedDisposition == FILE_CREATE ||
 262             RequestedDisposition == FILE_OPEN_IF ||
 263             RequestedDisposition == FILE_OVERWRITE_IF ||
 264             RequestedDisposition == FILE_SUPERSEDE)
 265         {
 266             DPRINT1("Denying write request on NTFS volume\n");
 267             return STATUS_ACCESS_DENIED;
 268         }
 269     }
 270
 271     /*
 272      * If the directory containing the file to open doesn't exist then
 273      * fail immediately
 274      */
 275     Irp->IoStatus.Information = (NT_SUCCESS(Status)) ? FILE_OPENED : 0;
 276     Irp->IoStatus.Status = Status;
 277
 278     return Status;
 279 }
 280
 281
 282 NTSTATUS
 283 NTAPI
 284 NtfsFsdCreate(PDEVICE_OBJECT DeviceObject,
 285               PIRP Irp)
 286 {
 287     PDEVICE_EXTENSION DeviceExt;
 288     NTSTATUS Status;
 289
 290     if (DeviceObject == NtfsGlobalData->DeviceObject)
 291     {
 292         /* DeviceObject represents FileSystem instead of logical volume */
 293         DPRINT("Opening file system\n");
 294         Irp->IoStatus.Information = FILE_OPENED;
 295         Status = STATUS_SUCCESS;
 296         goto ByeBye;
 297     }
 298
 299     DeviceExt = DeviceObject->DeviceExtension;
 300
 301     FsRtlEnterFileSystem();
 302     ExAcquireResourceExclusiveLite(&DeviceExt->DirResource,
 303                                    TRUE);
 304     Status = NtfsCreateFile(DeviceObject,
 305                             Irp);
 306     ExReleaseResourceLite(&DeviceExt->DirResource);
 307     FsRtlExitFileSystem();
 308
 309 ByeBye:
 310     Irp->IoStatus.Status = Status;
 311     IoCompleteRequest(Irp,
 312                       NT_SUCCESS(Status) ? IO_DISK_INCREMENT : IO_NO_INCREMENT);
 313
 314     return Status;
 315 }
 316
 317 /* EOF */