reactos/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              PNTFS_FCB * FoundFCB)
  83 {
  84     PNTFS_FCB ParentFcb;
  85     PNTFS_FCB Fcb;
  86     NTSTATUS Status;
  87     PWSTR AbsFileName = NULL;
  88
  89     DPRINT1("NtfsOpenFile(%p, %p, %S, %p)\n", DeviceExt, FileObject, FileName, FoundFCB);
  90
  91     *FoundFCB = NULL;
  92
  93     if (FileObject->RelatedFileObject)
  94     {
  95         DPRINT("Converting relative filename to absolute filename\n");
  96
  97         Status = NtfsMakeAbsoluteFilename(FileObject->RelatedFileObject,
  98                                           FileName,
  99                                           &AbsFileName);
 100         FileName = AbsFileName;
 101         if (!NT_SUCCESS(Status))
 102         {
 103             return Status;
 104         }
 105
 106         return STATUS_UNSUCCESSFUL;
 107     }
 108
 109     //FIXME: Get cannonical path name (remove .'s, ..'s and extra separators)
 110
 111     DPRINT("PathName to open: %S\n", FileName);
 112
 113     /*  try first to find an existing FCB in memory  */
 114     DPRINT("Checking for existing FCB in memory\n");
 115     Fcb = NtfsGrabFCBFromTable(DeviceExt,
 116                                FileName);
 117     if (Fcb == NULL)
 118     {
 119         DPRINT("No existing FCB found, making a new one if file exists.\n");
 120         Status = NtfsGetFCBForFile(DeviceExt,
 121                                    &ParentFcb,
 122                                    &Fcb,
 123                                    FileName);
 124         if (ParentFcb != NULL)
 125         {
 126             NtfsReleaseFCB(DeviceExt,
 127                            ParentFcb);
 128         }
 129
 130         if (!NT_SUCCESS (Status))
 131         {
 132             DPRINT("Could not make a new FCB, status: %x\n", Status);
 133
 134             if (AbsFileName)
 135                 ExFreePool(AbsFileName);
 136
 137             return Status;
 138         }
 139     }
 140
 141     DPRINT("Attaching FCB to fileObject\n");
 142     Status = NtfsAttachFCBToFileObject(DeviceExt,
 143                                        Fcb,
 144                                        FileObject);
 145
 146     if (AbsFileName)
 147         ExFreePool(AbsFileName);
 148
 149     *FoundFCB = Fcb;
 150
 151     return Status;
 152 }
 153
 154
 155 /*
 156  * FUNCTION: Opens a file
 157  */
 158 static
 159 NTSTATUS
 160 NtfsCreateFile(PDEVICE_OBJECT DeviceObject,
 161                PIRP Irp)
 162 {
 163     PDEVICE_EXTENSION DeviceExt;
 164     PIO_STACK_LOCATION Stack;
 165     PFILE_OBJECT FileObject;
 166     ULONG RequestedDisposition;
 167     ULONG RequestedOptions;
 168     PNTFS_FCB Fcb;
 169 //    PWSTR FileName;
 170     NTSTATUS Status;
 171
 172     DPRINT1("NtfsCreateFile(%p, %p) called\n", DeviceObject, Irp);
 173
 174     DeviceExt = DeviceObject->DeviceExtension;
 175     ASSERT(DeviceExt);
 176     Stack = IoGetCurrentIrpStackLocation (Irp);
 177     ASSERT(Stack);
 178
 179     RequestedDisposition = ((Stack->Parameters.Create.Options >> 24) & 0xff);
 180     RequestedOptions = Stack->Parameters.Create.Options & FILE_VALID_OPTION_FLAGS;
 181 //  PagingFileCreate = (Stack->Flags & SL_OPEN_PAGING_FILE) ? TRUE : FALSE;
 182     if (RequestedOptions & FILE_DIRECTORY_FILE &&
 183         RequestedDisposition == FILE_SUPERSEDE)
 184     {
 185         return STATUS_INVALID_PARAMETER;
 186     }
 187
 188     FileObject = Stack->FileObject;
 189
 190     if (RequestedDisposition == FILE_CREATE ||
 191         RequestedDisposition == FILE_OVERWRITE_IF ||
 192         RequestedDisposition == FILE_SUPERSEDE)
 193     {
 194         return STATUS_ACCESS_DENIED;
 195     }
 196
 197     /* This a open operation for the volume itself */
 198     if (FileObject->FileName.Length == 0 &&
 199         (FileObject->RelatedFileObject == NULL || FileObject->RelatedFileObject->FsContext2 != NULL))
 200     {
 201         if (RequestedDisposition != FILE_OPEN &&
 202             RequestedDisposition != FILE_OPEN_IF)
 203         {
 204             return STATUS_ACCESS_DENIED;
 205         }
 206
 207         if (RequestedOptions & FILE_DIRECTORY_FILE)
 208         {
 209             return STATUS_NOT_A_DIRECTORY;
 210         }
 211
 212         NtfsAttachFCBToFileObject(DeviceExt, DeviceExt->VolumeFcb, FileObject);
 213         DeviceExt->VolumeFcb->RefCount++;
 214
 215         Irp->IoStatus.Information = FILE_OPENED;
 216         return STATUS_SUCCESS;
 217     }
 218
 219     Status = NtfsOpenFile(DeviceExt,
 220                           FileObject,
 221                           FileObject->FileName.Buffer,
 222                           &Fcb);
 223
 224     /*
 225      * If the directory containing the file to open doesn't exist then
 226      * fail immediately
 227      */
 228     Irp->IoStatus.Information = (NT_SUCCESS(Status)) ? FILE_OPENED : 0;
 229     Irp->IoStatus.Status = Status;
 230
 231     return Status;
 232 }
 233
 234
 235 NTSTATUS
 236 NTAPI
 237 NtfsFsdCreate(PDEVICE_OBJECT DeviceObject,
 238               PIRP Irp)
 239 {
 240     PDEVICE_EXTENSION DeviceExt;
 241     NTSTATUS Status;
 242
 243     if (DeviceObject == NtfsGlobalData->DeviceObject)
 244     {
 245         /* DeviceObject represents FileSystem instead of logical volume */
 246         DPRINT("Opening file system\n");
 247         Irp->IoStatus.Information = FILE_OPENED;
 248         Status = STATUS_SUCCESS;
 249         goto ByeBye;
 250     }
 251
 252     DeviceExt = DeviceObject->DeviceExtension;
 253
 254     FsRtlEnterFileSystem();
 255     ExAcquireResourceExclusiveLite(&DeviceExt->DirResource,
 256                                    TRUE);
 257     Status = NtfsCreateFile(DeviceObject,
 258                             Irp);
 259     ExReleaseResourceLite(&DeviceExt->DirResource);
 260     FsRtlExitFileSystem();
 261
 262 ByeBye:
 263     Irp->IoStatus.Status = Status;
 264     IoCompleteRequest(Irp,
 265                       NT_SUCCESS(Status) ? IO_DISK_INCREMENT : IO_NO_INCREMENT);
 266
 267     return Status;
 268 }
 269
 270 /* EOF */