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 /* FUNCTIONS ****************************************************************/
  34
  35 static
  36 NTSTATUS
  37 NtfsMakeAbsoluteFilename(PFILE_OBJECT pFileObject,
  38                          PWSTR pRelativeFileName,
  39                          PWSTR *pAbsoluteFilename)
  40 {
  41     PWSTR rcName;
  42     PNTFS_FCB Fcb;
  43
  44     DPRINT("try related for %S\n", pRelativeFileName);
  45     Fcb = pFileObject->FsContext;
  46     ASSERT(Fcb);
  47
  48     /* verify related object is a directory and target name
  49        don't start with \. */
  50     if (NtfsFCBIsDirectory(Fcb) == FALSE ||
  51         pRelativeFileName[0] == L'\\')
  52     {
  53         return STATUS_INVALID_PARAMETER;
  54     }
  55
  56     /* construct absolute path name */
  57     ASSERT(wcslen (Fcb->PathName) + 1 + wcslen (pRelativeFileName) + 1 <= MAX_PATH);
  58     rcName = ExAllocatePoolWithTag(NonPagedPool, MAX_PATH * sizeof(WCHAR), TAG_NTFS);
  59     if (!rcName)
  60     {
  61         return STATUS_INSUFFICIENT_RESOURCES;
  62     }
  63
  64     wcscpy(rcName, Fcb->PathName);
  65     if (!NtfsFCBIsRoot(Fcb))
  66         wcscat (rcName, L"\\");
  67     wcscat (rcName, pRelativeFileName);
  68     *pAbsoluteFilename = rcName;
  69
  70     return STATUS_SUCCESS;
  71 }
  72
  73
  74 /*
  75  * FUNCTION: Opens a file
  76  */
  77 static
  78 NTSTATUS
  79 NtfsOpenFile(PDEVICE_EXTENSION DeviceExt,
  80              PFILE_OBJECT FileObject,
  81              PWSTR FileName)
  82 {
  83     PNTFS_FCB ParentFcb;
  84     PNTFS_FCB Fcb;
  85     NTSTATUS Status;
  86     PWSTR AbsFileName = NULL;
  87
  88     DPRINT("NtfsOpenFile(%p, %p, %S)\n", DeviceExt, FileObject, FileName);
  89
  90     if (FileObject->RelatedFileObject)
  91     {
  92         DPRINT("Converting relative filename to absolute filename\n");
  93
  94         Status = NtfsMakeAbsoluteFilename(FileObject->RelatedFileObject,
  95                                           FileName,
  96                                           &AbsFileName);
  97         FileName = AbsFileName;
  98         if (!NT_SUCCESS(Status))
  99         {
 100             return Status;
 101         }
 102
 103         return STATUS_UNSUCCESSFUL;
 104     }
 105
 106     //FIXME: Get cannonical path name (remove .'s, ..'s and extra separators)
 107
 108     DPRINT("PathName to open: %S\n", FileName);
 109
 110     /*  try first to find an existing FCB in memory  */
 111     DPRINT("Checking for existing FCB in memory\n");
 112     Fcb = NtfsGrabFCBFromTable(DeviceExt,
 113                                FileName);
 114     if (Fcb == NULL)
 115     {
 116         DPRINT("No existing FCB found, making a new one if file exists.\n");
 117         Status = NtfsGetFCBForFile(DeviceExt,
 118                                    &ParentFcb,
 119                                    &Fcb,
 120                                    FileName);
 121         if (ParentFcb != NULL)
 122         {
 123             NtfsReleaseFCB(DeviceExt,
 124                            ParentFcb);
 125         }
 126
 127         if (!NT_SUCCESS (Status))
 128         {
 129             DPRINT("Could not make a new FCB, status: %x\n", Status);
 130
 131             if (AbsFileName)
 132                 ExFreePool(AbsFileName);
 133
 134             return Status;
 135         }
 136     }
 137
 138     DPRINT("Attaching FCB to fileObject\n");
 139     Status = NtfsAttachFCBToFileObject(DeviceExt,
 140                                        Fcb,
 141                                        FileObject);
 142
 143     if (AbsFileName)
 144         ExFreePool(AbsFileName);
 145
 146     return Status;
 147 }
 148
 149
 150 /*
 151  * FUNCTION: Opens a file
 152  */
 153 static
 154 NTSTATUS
 155 NtfsCreateFile(PDEVICE_OBJECT DeviceObject,
 156                PIRP Irp)
 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
 207 NTAPI
 208 NtfsFsdCreate(PDEVICE_OBJECT DeviceObject,
 209               PIRP Irp)
 210 {
 211     PDEVICE_EXTENSION DeviceExt;
 212     NTSTATUS Status;
 213
 214     if (DeviceObject == NtfsGlobalData->DeviceObject)
 215     {
 216         /* DeviceObject represents FileSystem instead of logical volume */
 217         DPRINT("Opening file system\n");
 218         Irp->IoStatus.Information = FILE_OPENED;
 219         Status = STATUS_SUCCESS;
 220         goto ByeBye;
 221     }
 222
 223     DeviceExt = DeviceObject->DeviceExtension;
 224
 225     FsRtlEnterFileSystem();
 226     ExAcquireResourceExclusiveLite(&DeviceExt->DirResource,
 227                                    TRUE);
 228     Status = NtfsCreateFile(DeviceObject,
 229                             Irp);
 230     ExReleaseResourceLite(&DeviceExt->DirResource);
 231     FsRtlExitFileSystem();
 232
 233 ByeBye:
 234     Irp->IoStatus.Status = Status;
 235     IoCompleteRequest(Irp,
 236                       NT_SUCCESS(Status) ? IO_DISK_INCREMENT : IO_NO_INCREMENT);
 237
 238     return Status;
 239 }
 240
 241 /* EOF */