reactos/drivers/fs/vfat/create.c

   1 /* $Id: create.c,v 1.34 2001/11/02 22:44:34 hbirr Exp $
   2  *
   3  * COPYRIGHT:        See COPYING in the top level directory
   4  * PROJECT:          ReactOS kernel
   5  * FILE:             services/fs/vfat/create.c
   6  * PURPOSE:          VFAT Filesystem
   7  * PROGRAMMER:       Jason Filby (jasonfilby@yahoo.com)
   8
   9  */
  10
  11 /* INCLUDES *****************************************************************/
  12
  13 #include <ddk/ntddk.h>
  14 #include <wchar.h>
  15 #include <limits.h>
  16
  17 #define NDEBUG
  18 #include <debug.h>
  19
  20 #include "vfat.h"
  21
  22 /* GLOBALS *******************************************************************/
  23
  24 #define ENTRIES_PER_PAGE   (PAGESIZE / sizeof (FATDirEntry))
  25
  26 /* FUNCTIONS *****************************************************************/
  27
  28 BOOLEAN
  29 IsLastEntry (PVOID Block, ULONG Offset)
  30 /*
  31  * FUNCTION: Determine if the given directory entry is the last
  32  */
  33 {
  34   return (((FATDirEntry *) Block)[Offset].Filename[0] == 0);
  35 }
  36
  37 BOOLEAN
  38 IsVolEntry (PVOID Block, ULONG Offset)
  39 /*
  40  * FUNCTION: Determine if the given directory entry is a vol entry
  41  */
  42 {
  43   if ((((FATDirEntry *) Block)[Offset].Attrib) == 0x28)
  44     return TRUE;
  45   else
  46     return FALSE;
  47 }
  48
  49 BOOLEAN
  50 IsDeletedEntry (PVOID Block, ULONG Offset)
  51 /*
  52  * FUNCTION: Determines if the given entry is a deleted one
  53  */
  54 {
  55   /* Checks special character */
  56
  57   return ((((FATDirEntry *) Block)[Offset].Filename[0] == 0xe5) ||
  58           (((FATDirEntry *) Block)[Offset].Filename[0] == 0));
  59 }
  60
  61 void  vfat8Dot3ToString (PCHAR pBasename, PCHAR pExtension, PWSTR pName)
  62 {
  63   int  fromIndex, toIndex;
  64
  65   fromIndex = toIndex = 0;
  66   while (fromIndex < 8 && pBasename [fromIndex] != ' ')
  67   {
  68     pName [toIndex++] = pBasename [fromIndex++];
  69   }
  70   if (pExtension [0] != ' ')
  71   {
  72     pName [toIndex++] = L'.';
  73     fromIndex = 0;
  74     while (fromIndex < 3 && pExtension [fromIndex] != ' ')
  75     {
  76       pName [toIndex++] = pExtension [fromIndex++];
  77     }
  78   }
  79   pName [toIndex] = L'\0';
  80 }
  81
  82 static void  vfat8Dot3ToVolumeLabel (PCHAR pBasename, PCHAR pExtension, PWSTR pName)
  83 {
  84   int  fromIndex, toIndex;
  85
  86   fromIndex = toIndex = 0;
  87   while (fromIndex < 8 && pBasename [fromIndex] != ' ')
  88   {
  89     pName [toIndex++] = pBasename [fromIndex++];
  90   }
  91   if (pExtension [0] != ' ')
  92   {
  93     fromIndex = 0;
  94     while (fromIndex < 3 && pBasename [fromIndex] != ' ')
  95     {
  96       pName [toIndex++] = pExtension [fromIndex++];
  97     }
  98   }
  99   pName [toIndex] = L'\0';
 100 }
 101
 102 NTSTATUS
 103 GetEntryName(PVOID *pContext,
 104              PVOID *Block,
 105              PFILE_OBJECT FileObject,
 106              PWSTR Name,
 107              PULONG pIndex,
 108              PULONG pIndex2)
 109 /*
 110  * FUNCTION: Retrieves the file name, be it in short or long file name format
 111  */
 112 {
 113   NTSTATUS Status;
 114   FATDirEntry * test;
 115   slot * test2;
 116   ULONG cpos;
 117   ULONG Offset = *pIndex % ENTRIES_PER_PAGE;
 118   ULONG Read;
 119   LARGE_INTEGER FileOffset;
 120
 121   *Name = 0;
 122   while (TRUE)
 123   {
 124     test = (FATDirEntry *) *Block;
 125     test2 = (slot *) *Block;
 126     if (vfatIsDirEntryEndMarker(&test[Offset]))
 127     {
 128       return STATUS_NO_MORE_ENTRIES;
 129     }
 130     if (test2[Offset].attr == 0x0f && !vfatIsDirEntryDeleted(&test[Offset]))
 131     {
 132       *Name = 0;
 133       if (pIndex2)
 134         *pIndex2 = *pIndex; // start of dir entry
 135
 136       DPRINT ("  long name entry found at %d\n", *pIndex);
 137
 138       DPRINT ("  name chunk1:[%.*S] chunk2:[%.*S] chunk3:[%.*S]\n",
 139               5, test2 [Offset].name0_4,
 140               6, test2 [Offset].name5_10,
 141               2, test2 [Offset].name11_12);
 142
 143       vfat_initstr (Name, 255);
 144       vfat_wcsncpy (Name, test2[Offset].name0_4, 5);
 145       vfat_wcsncat (Name, test2[Offset].name5_10, 5, 6);
 146       vfat_wcsncat (Name, test2[Offset].name11_12, 11, 2);
 147
 148       DPRINT ("  longName: [%S]\n", Name);
 149       cpos = 0;
 150       while ((test2[Offset].id != 0x41) && (test2[Offset].id != 0x01) &&
 151         (test2[Offset].attr > 0))
 152           {
 153             (*pIndex)++;
 154         Offset++;
 155
 156             if (Offset == ENTRIES_PER_PAGE)
 157         {
 158           Offset = 0;
 159           CcUnpinData(*pContext);
 160           FileOffset.QuadPart = *pIndex * sizeof(FATDirEntry);
 161           if(!CcMapData(FileObject, &FileOffset, PAGESIZE, TRUE, pContext, Block))
 162           {
 163             *pContext = NULL;
 164             return STATUS_NO_MORE_ENTRIES;
 165           }
 166               test2 = (slot *) *Block;
 167         }
 168         DPRINT ("  long name entry found at %d\n", *pIndex);
 169
 170         DPRINT ("  name chunk1:[%.*S] chunk2:[%.*S] chunk3:[%.*S]\n",
 171                  5, test2 [Offset].name0_4,
 172                  6, test2 [Offset].name5_10,
 173                  2, test2 [Offset].name11_12);
 174
 175             cpos++;
 176             vfat_movstr (Name, 13, 0, cpos * 13);
 177             vfat_wcsncpy (Name, test2[Offset].name0_4, 5);
 178             vfat_wcsncat (Name, test2[Offset].name5_10, 5, 6);
 179             vfat_wcsncat (Name, test2[Offset].name11_12, 11, 2);
 180
 181         DPRINT ("  longName: [%S]\n", Name);
 182           }
 183       (*pIndex)++;
 184       Offset++;
 185           if (Offset == ENTRIES_PER_PAGE)
 186       {
 187         Offset = 0;
 188         CcUnpinData(*pContext);
 189         FileOffset.QuadPart = *pIndex * sizeof(FATDirEntry);
 190         if(!CcMapData(FileObject, &FileOffset, PAGESIZE, TRUE, pContext, Block))
 191          {
 192           *pContext = NULL;
 193           return STATUS_NO_MORE_ENTRIES;
 194         }
 195             test2 = (slot *) *Block;
 196         test = (FATDirEntry*) *Block;
 197       }
 198     }
 199     else
 200     {
 201       if (vfatIsDirEntryEndMarker(&test[Offset]))
 202         return STATUS_NO_MORE_ENTRIES;
 203       if (vfatIsDirEntryDeleted(&test[Offset]))
 204         return STATUS_UNSUCCESSFUL;
 205       if (*Name == 0)
 206       {
 207         vfat8Dot3ToString (test[Offset].Filename, test[Offset].Ext, Name);
 208         if (pIndex2)
 209           *pIndex2 = *pIndex;
 210       }
 211       break;
 212     }
 213   }
 214   return STATUS_SUCCESS;
 215 }
 216
 217 NTSTATUS
 218 ReadVolumeLabel (PDEVICE_EXTENSION DeviceExt, PVPB Vpb)
 219 /*
 220  * FUNCTION: Read the volume label
 221  */
 222 {
 223   ULONG i = 0;
 224   ULONG j;
 225   ULONG Size;
 226   char *block;
 227   ULONG StartingSector;
 228   ULONG NextCluster;
 229   NTSTATUS Status;
 230
 231   Size = DeviceExt->rootDirectorySectors;      /* FIXME : in fat32, no limit */
 232   StartingSector = DeviceExt->rootStart;
 233   NextCluster = 0;
 234
 235   block = ExAllocatePool (NonPagedPool, BLOCKSIZE);
 236   DPRINT ("ReadVolumeLabel : start at sector %lx, entry %ld\n", StartingSector, i);
 237   for (j = 0; j < Size; j++)
 238     {
 239       /* FIXME: Check status */
 240       Status = VfatReadSectors (DeviceExt->StorageDevice, StartingSector, 1, block);
 241       if (!NT_SUCCESS(Status))
 242         {
 243           *(Vpb->VolumeLabel) = 0;
 244           Vpb->VolumeLabelLength = 0;
 245           ExFreePool(block);
 246           return(Status);
 247         }
 248
 249       for (i = 0; i < ENTRIES_PER_SECTOR; i++)
 250         {
 251           if (IsVolEntry ((PVOID) block, i))
 252             {
 253               FATDirEntry *test = (FATDirEntry *) block;
 254
 255               /* copy volume label */
 256               vfat8Dot3ToVolumeLabel (test[i].Filename, test[i].Ext, Vpb->VolumeLabel);
 257               Vpb->VolumeLabelLength = wcslen (Vpb->VolumeLabel);
 258
 259               ExFreePool (block);
 260               return (STATUS_SUCCESS);
 261             }
 262           if (IsLastEntry ((PVOID) block, i))
 263             {
 264               *(Vpb->VolumeLabel) = 0;
 265               Vpb->VolumeLabelLength = 0;
 266               ExFreePool (block);
 267               return (STATUS_UNSUCCESSFUL);
 268             }
 269         }
 270       /* not found in this sector, try next : */
 271
 272       /* directory can be fragmented although it is best to keep them
 273          unfragmented.*/
 274       StartingSector++;
 275
 276       if (DeviceExt->FatType == FAT32)
 277         {
 278           if (StartingSector == ClusterToSector (DeviceExt, NextCluster + 1))
 279             {
 280               Status = GetNextCluster (DeviceExt, NextCluster, &NextCluster,
 281                                        FALSE);
 282               if (NextCluster == 0 || NextCluster == 0xffffffff)
 283                 {
 284                   *(Vpb->VolumeLabel) = 0;
 285                   Vpb->VolumeLabelLength = 0;
 286                   ExFreePool (block);
 287                   return (STATUS_UNSUCCESSFUL);
 288                 }
 289               StartingSector = ClusterToSector (DeviceExt, NextCluster);
 290             }
 291         }
 292     }
 293   *(Vpb->VolumeLabel) = 0;
 294   Vpb->VolumeLabelLength = 0;
 295   ExFreePool (block);
 296   return (STATUS_UNSUCCESSFUL);
 297 }
 298
 299 NTSTATUS
 300 FindFile (PDEVICE_EXTENSION DeviceExt,
 301           PVFATFCB Fcb,
 302           PVFATFCB Parent,
 303           PWSTR FileToFind,
 304           ULONG *pDirIndex,
 305           ULONG *pDirIndex2)
 306 /*
 307  * FUNCTION: Find a file
 308  */
 309 {
 310   WCHAR name[256];
 311   WCHAR name2[14];
 312   char * block;
 313   WCHAR TempStr[2];
 314   NTSTATUS Status;
 315   ULONG len;
 316   ULONG DirIndex;
 317   ULONG Offset;
 318   ULONG FirstCluster;
 319   ULONG Read;
 320   BOOL isRoot;
 321   LARGE_INTEGER FileOffset;
 322   PVOID Context = NULL;
 323
 324   DPRINT ("FindFile(Parent %x, FileToFind '%S', DirIndex: %d)\n", Parent, FileToFind, pDirIndex ? *pDirIndex : 0);
 325   DPRINT ("FindFile: old Pathname %x, old Objectname %x)\n",Fcb->PathName, Fcb->ObjectName);
 326
 327   isRoot = FALSE;
 328   DirIndex = 0;
 329   if (wcslen (FileToFind) == 0)
 330   {
 331     CHECKPOINT;
 332     TempStr[0] = (WCHAR) '.';
 333     TempStr[1] = 0;
 334     FileToFind = (PWSTR)&TempStr;
 335   }
 336   if (Parent)
 337   {
 338     FirstCluster = vfatDirEntryGetFirstCluster(DeviceExt, &Parent->entry);
 339     if (DeviceExt->FatType == FAT32)
 340     {
 341       if (FirstCluster == ((struct _BootSector32*)(DeviceExt->Boot))->RootCluster)
 342         isRoot = TRUE;
 343     }
 344     else
 345     {
 346       if (FirstCluster == 1)
 347         isRoot = TRUE;
 348     }
 349   }
 350   else
 351     isRoot = TRUE;
 352   if (isRoot)
 353   {
 354     if (DeviceExt->FatType == FAT32)
 355       FirstCluster = ((struct _BootSector32*)(DeviceExt->Boot))->RootCluster;
 356     else
 357       FirstCluster = 1;
 358
 359     if (FileToFind[0] == 0 || (FileToFind[0] == '\\' && FileToFind[1] == 0)
 360             || (FileToFind[0] == '.' && FileToFind[1] == 0))
 361         {
 362           /* it's root : complete essentials fields then return ok */
 363           CHECKPOINT;
 364           memset (Fcb, 0, sizeof (VFATFCB));
 365           memset (Fcb->entry.Filename, ' ', 11);
 366           CHECKPOINT;
 367           Fcb->PathName[0]='\\';
 368           Fcb->ObjectName = &Fcb->PathName[1];
 369           Fcb->entry.FileSize = DeviceExt->rootDirectorySectors * BLOCKSIZE;
 370           Fcb->entry.Attrib = FILE_ATTRIBUTE_DIRECTORY;
 371           if (DeviceExt->FatType == FAT32)
 372       {
 373             Fcb->entry.FirstCluster = ((PUSHORT)FirstCluster)[0];
 374         Fcb->entry.FirstClusterHigh = ((PUSHORT)FirstCluster)[1];
 375       }
 376           else
 377             Fcb->entry.FirstCluster = 1;
 378           if (pDirIndex)
 379             *pDirIndex = 0;
 380       if (pDirIndex2)
 381         *pDirIndex2 = 0;
 382           DPRINT("FindFile: new Pathname %S, new Objectname %S)\n",Fcb->PathName, Fcb->ObjectName);
 383           return (STATUS_SUCCESS);
 384         }
 385   }
 386   else
 387   {
 388     DPRINT ("Parent->entry.FileSize %x\n", Parent->entry.FileSize);
 389     FirstCluster = vfatDirEntryGetFirstCluster (DeviceExt, &Parent->entry);
 390   }
 391   if (pDirIndex && (*pDirIndex))
 392     DirIndex = *pDirIndex;
 393
 394   Offset = DirIndex % ENTRIES_PER_PAGE;
 395   while(TRUE)
 396   {
 397     if (Context == NULL || Offset == ENTRIES_PER_PAGE)
 398     {
 399       if (Offset == ENTRIES_PER_PAGE)
 400         Offset = 0;
 401       if (Context)
 402       {
 403         CcUnpinData(Context);
 404       }
 405       FileOffset.QuadPart = (DirIndex - Offset) * sizeof(FATDirEntry);
 406       if (!CcMapData(Parent->FileObject, &FileOffset, PAGESIZE, TRUE,
 407              &Context, (PVOID*)&block))
 408       {
 409          Context = NULL;
 410          break;
 411       }
 412     }
 413         if (vfatIsDirEntryVolume(&((FATDirEntry*)block)[Offset]))
 414     {
 415       Offset++;
 416       DirIndex++;
 417           continue;
 418     }
 419     Status = GetEntryName (&Context, (PVOID*)&block, Parent->FileObject, name,
 420                            &DirIndex, pDirIndex2);
 421     if (Status == STATUS_NO_MORE_ENTRIES)
 422       break;
 423     Offset = DirIndex % ENTRIES_PER_PAGE;
 424     if (NT_SUCCESS(Status))
 425         {
 426       vfat8Dot3ToString(((FATDirEntry *) block)[Offset].Filename,((FATDirEntry *) block)[Offset].Ext, name2);
 427           if (wstrcmpjoki (name, FileToFind) || wstrcmpjoki (name2, FileToFind))
 428           {
 429             if (Parent && Parent->PathName)
 430                 {
 431                   len = wcslen(Parent->PathName);
 432                   CHECKPOINT;
 433                   memcpy(Fcb->PathName, Parent->PathName, len*sizeof(WCHAR));
 434                   Fcb->ObjectName=&Fcb->PathName[len];
 435                   if (len != 1 || Fcb->PathName[0] != '\\')
 436                   {
 437                     Fcb->ObjectName[0] = '\\';
 438                         Fcb->ObjectName = &Fcb->ObjectName[1];
 439                   }
 440                 }
 441                 else
 442                 {
 443                   Fcb->ObjectName=Fcb->PathName;
 444                   Fcb->ObjectName[0]='\\';
 445                   Fcb->ObjectName=&Fcb->ObjectName[1];
 446                 }
 447
 448                 memcpy (&Fcb->entry, &((FATDirEntry *) block)[Offset],
 449                              sizeof (FATDirEntry));
 450                 vfat_wcsncpy (Fcb->ObjectName, name, MAX_PATH);
 451                 if (pDirIndex)
 452                   *pDirIndex = DirIndex;
 453          DPRINT("FindFile: new Pathname %S, new Objectname %S, DirIndex %d\n",Fcb->PathName, Fcb->ObjectName, DirIndex);
 454                 if (Context)
 455                   CcUnpinData(Context);
 456                 return STATUS_SUCCESS;
 457           }
 458     }
 459     Offset++;
 460     DirIndex++;
 461   }
 462   if (pDirIndex)
 463         *pDirIndex = DirIndex;
 464   if (Context)
 465     CcUnpinData(Context);
 466   return (STATUS_UNSUCCESSFUL);
 467 }
 468
 469 NTSTATUS
 470 vfatMakeAbsoluteFilename (PFILE_OBJECT pFileObject,
 471                           PWSTR pRelativeFileName,
 472                           PWSTR *pAbsoluteFilename)
 473 {
 474   PWSTR  rcName;
 475   PVFATFCB  fcb;
 476   PVFATCCB  ccb;
 477
 478   DbgPrint ("try related for %S\n", pRelativeFileName);
 479   ccb = pFileObject->FsContext2;
 480   assert (ccb);
 481   fcb = ccb->pFcb;
 482   assert (fcb);
 483
 484   /* verify related object is a directory and target name
 485      don't start with \. */
 486   if (!(fcb->entry.Attrib & FILE_ATTRIBUTE_DIRECTORY)
 487       || (pRelativeFileName[0] != '\\'))
 488   {
 489     return  STATUS_INVALID_PARAMETER;
 490   }
 491
 492   /* construct absolute path name */
 493   assert (wcslen (fcb->PathName) + 1 + wcslen (pRelativeFileName) + 1
 494           <= MAX_PATH);
 495   rcName = ExAllocatePool (NonPagedPool, MAX_PATH);
 496   wcscpy (rcName, fcb->PathName);
 497   wcscat (rcName, L"\\");
 498   wcscat (rcName, pRelativeFileName);
 499   *pAbsoluteFilename = rcName;
 500
 501   return  STATUS_SUCCESS;
 502 }
 503
 504 NTSTATUS
 505 VfatOpenFile (PDEVICE_EXTENSION DeviceExt, PFILE_OBJECT FileObject,
 506              PWSTR FileName)
 507 /*
 508  * FUNCTION: Opens a file
 509  */
 510 {
 511   PVFATFCB ParentFcb;
 512   PVFATFCB Fcb;
 513   NTSTATUS Status;
 514   PWSTR AbsFileName = NULL;
 515
 516   DPRINT ("VfatOpenFile(%08lx, %08lx, %S)\n", DeviceExt, FileObject, FileName);
 517
 518   if (FileObject->RelatedFileObject)
 519     {
 520       DPRINT ("Converting relative filename to absolute filename\n");
 521       Status = vfatMakeAbsoluteFilename (FileObject->RelatedFileObject,
 522                                          FileName,
 523                                          &AbsFileName);
 524       FileName = AbsFileName;
 525     }
 526
 527   //FIXME: Get cannonical path name (remove .'s, ..'s and extra separators)
 528
 529   DPRINT ("PathName to open: %S\n", FileName);
 530
 531   /*  try first to find an existing FCB in memory  */
 532   DPRINT ("Checking for existing FCB in memory\n");
 533   Fcb = vfatGrabFCBFromTable (DeviceExt, FileName);
 534   if (Fcb == NULL)
 535   {
 536     DPRINT ("No existing FCB found, making a new one if file exists.\n");
 537     Status = vfatGetFCBForFile (DeviceExt, &ParentFcb, &Fcb, FileName);
 538     if (ParentFcb != NULL)
 539     {
 540       vfatReleaseFCB (DeviceExt, ParentFcb);
 541     }
 542     if (!NT_SUCCESS (Status))
 543     {
 544       DPRINT ("Could not make a new FCB, status: %x\n", Status);
 545
 546       if (AbsFileName)
 547         ExFreePool (AbsFileName);
 548
 549       return  Status;
 550     }
 551   }
 552   if (Fcb->Flags & FCB_DELETE_PENDING)
 553   {
 554     vfatReleaseFCB (DeviceExt, Fcb);
 555     if (AbsFileName)
 556       ExFreePool (AbsFileName);
 557     return STATUS_DELETE_PENDING;
 558   }
 559   DPRINT ("Attaching FCB to fileObject\n");
 560   Status = vfatAttachFCBToFileObject (DeviceExt, Fcb, FileObject);
 561
 562   if (AbsFileName)
 563     ExFreePool (AbsFileName);
 564
 565   return  Status;
 566 }
 567
 568 NTSTATUS
 569 VfatCreateFile (PDEVICE_OBJECT DeviceObject, PIRP Irp)
 570 /*
 571  * FUNCTION: Create or open a file
 572  */
 573 {
 574   PIO_STACK_LOCATION Stack;
 575   PFILE_OBJECT FileObject;
 576   NTSTATUS Status = STATUS_SUCCESS;
 577   PDEVICE_EXTENSION DeviceExt;
 578   ULONG RequestedDisposition, RequestedOptions;
 579   PVFATCCB pCcb;
 580   PVFATFCB pFcb;
 581   PWCHAR c;
 582
 583   Stack = IoGetCurrentIrpStackLocation (Irp);
 584   assert (Stack);
 585   RequestedDisposition = ((Stack->Parameters.Create.Options >> 24) & 0xff);
 586   RequestedOptions =
 587     Stack->Parameters.Create.Options & FILE_VALID_OPTION_FLAGS;
 588   if ((RequestedOptions & FILE_DIRECTORY_FILE)
 589       && RequestedDisposition == FILE_SUPERSEDE)
 590     return STATUS_INVALID_PARAMETER;
 591   FileObject = Stack->FileObject;
 592   DeviceExt = DeviceObject->DeviceExtension;
 593   assert (DeviceExt);
 594
 595   /*
 596    * Check for illegal characters in the file name
 597    */
 598   c = FileObject->FileName.Buffer;
 599   while (*c != 0)
 600     {
 601       if (*c == L'*' || *c == L'?' || (*c == L'\\' && c[1] == L'\\'))
 602         {
 603           Irp->IoStatus.Information = 0;
 604           Irp->IoStatus.Status = STATUS_OBJECT_NAME_INVALID;
 605           return(STATUS_OBJECT_NAME_INVALID);
 606         }
 607       c++;
 608     }
 609
 610   Status = VfatOpenFile (DeviceExt, FileObject, FileObject->FileName.Buffer);
 611
 612   /*
 613    * If the directory containing the file to open doesn't exist then
 614    * fail immediately
 615    */
 616   Irp->IoStatus.Information = 0;
 617   if (Status == STATUS_OBJECT_PATH_NOT_FOUND)
 618     {
 619       Irp->IoStatus.Status = Status;
 620       return Status;
 621     }
 622
 623   if (Status == STATUS_DELETE_PENDING)
 624   {
 625     Irp->IoStatus.Status = Status;
 626     return Status;
 627   }
 628   if (!NT_SUCCESS (Status))
 629     {
 630       /*
 631        * If the file open failed then create the required file
 632        */
 633       if (RequestedDisposition == FILE_CREATE ||
 634           RequestedDisposition == FILE_OPEN_IF ||
 635           RequestedDisposition == FILE_OVERWRITE_IF ||
 636           RequestedDisposition == FILE_SUPERSEDE)
 637         {
 638           CHECKPOINT;
 639           Status =
 640             addEntry (DeviceExt, FileObject, RequestedOptions,
 641                       (Stack->Parameters.
 642                        Create.FileAttributes & FILE_ATTRIBUTE_VALID_FLAGS));
 643           if (NT_SUCCESS (Status))
 644             Irp->IoStatus.Information = FILE_CREATED;
 645           /* FIXME set size if AllocationSize requested */
 646           /* FIXME set extended attributes? */
 647           /* FIXME set share access */
 648           /* IoSetShareAccess(DesiredAccess,ShareAccess,FileObject,
 649            * ((PVfatCCB)(FileObject->FsContext2))->pFcb->FCBShareAccess);
 650            */
 651         }
 652     }
 653   else
 654   {
 655     /*
 656      * Otherwise fail if the caller wanted to create a new file
 657      */
 658     if (RequestedDisposition == FILE_CREATE)
 659         {
 660           Irp->IoStatus.Information = FILE_EXISTS;
 661           Status = STATUS_OBJECT_NAME_COLLISION;
 662         }
 663     pCcb = FileObject->FsContext2;
 664     pFcb = pCcb->pFcb;
 665     /*
 666      * If requested then delete the file and create a new one with the
 667      * same name
 668      */
 669     if (RequestedDisposition == FILE_SUPERSEDE)
 670     {
 671        ULONG Cluster, NextCluster;
 672        /* FIXME set size to 0 and free clusters */
 673        pFcb->entry.FileSize = 0;
 674        if (DeviceExt->FatType == FAT32)
 675             Cluster = pFcb->entry.FirstCluster
 676               + pFcb->entry.FirstClusterHigh * 65536;
 677        else
 678          Cluster = pFcb->entry.FirstCluster;
 679        pFcb->entry.FirstCluster = 0;
 680        pFcb->entry.FirstClusterHigh = 0;
 681        updEntry (DeviceExt, FileObject);
 682        if ((ULONG)pFcb->RFCB.FileSize.QuadPart > 0)
 683        {
 684          pFcb->RFCB.AllocationSize.QuadPart = 0;
 685          pFcb->RFCB.FileSize.QuadPart = 0;
 686          pFcb->RFCB.ValidDataLength.QuadPart = 0;
 687          CcSetFileSizes(FileObject, (PCC_FILE_SIZES)&pFcb->RFCB.AllocationSize);
 688        }
 689        while (Cluster != 0xffffffff && Cluster > 1)
 690        {
 691          Status = GetNextCluster (DeviceExt, Cluster, &NextCluster, FALSE);
 692          WriteCluster (DeviceExt, Cluster, 0);
 693          Cluster = NextCluster;
 694        }
 695     }
 696
 697     /*
 698      * Check the file has the requested attributes
 699      */
 700     if ((RequestedOptions & FILE_NON_DIRECTORY_FILE)
 701           && (pFcb->entry.Attrib & FILE_ATTRIBUTE_DIRECTORY))
 702         {
 703           Status = STATUS_FILE_IS_A_DIRECTORY;
 704         }
 705     if ((RequestedOptions & FILE_DIRECTORY_FILE)
 706           && !(pFcb->entry.Attrib & FILE_ATTRIBUTE_DIRECTORY))
 707         {
 708           Status = STATUS_NOT_A_DIRECTORY;
 709         }
 710     /* FIXME : test share access */
 711       /* FIXME : test write access if requested */
 712     if (!NT_SUCCESS (Status))
 713           VfatCloseFile (DeviceExt, FileObject);
 714     else
 715           Irp->IoStatus.Information = FILE_OPENED;
 716       /* FIXME : make supersed or overwrite if requested */
 717   }
 718
 719   Irp->IoStatus.Status = Status;
 720
 721   return Status;
 722 }
 723
 724
 725 NTSTATUS VfatCreate (PVFAT_IRP_CONTEXT IrpContext)
 726 /*
 727  * FUNCTION: Create or open a file
 728  */
 729 {
 730   NTSTATUS Status;
 731
 732   assert (IrpContext);
 733
 734   if (IrpContext->DeviceObject->Size == sizeof (DEVICE_OBJECT))
 735   {
 736      /* DeviceObject represents FileSystem instead of logical volume */
 737      DbgPrint ("FsdCreate called with file system\n");
 738      IrpContext->Irp->IoStatus.Information = FILE_OPENED;
 739      Status = STATUS_SUCCESS;
 740      goto ByeBye;
 741   }
 742
 743   if (!(IrpContext->Flags & IRPCONTEXT_CANWAIT))
 744   {
 745      return VfatQueueRequest (IrpContext);
 746   }
 747
 748   ExAcquireResourceExclusiveLite (&IrpContext->DeviceExt->DirResource, TRUE);
 749   Status = VfatCreateFile (IrpContext->DeviceObject, IrpContext->Irp);
 750   ExReleaseResourceLite (&IrpContext->DeviceExt->DirResource);
 751
 752 ByeBye:
 753   IrpContext->Irp->IoStatus.Status = Status;
 754   IoCompleteRequest (IrpContext->Irp, NT_SUCCESS(Status) ? IO_DISK_INCREMENT : IO_NO_INCREMENT);
 755   VfatFreeIrpContext(IrpContext);
 756   return Status;
 757 }
 758
 759 /* EOF */