reactos/drivers/filesystems/fastfat/fcb.c

   1 /*
   2 * FILE:             drivers/filesystems/fastfat/fcb.c
   3 * PURPOSE:          Routines to manipulate FCBs.
   4 * COPYRIGHT:        See COPYING in the top level directory
   5 * PROJECT:          ReactOS kernel
   6 * PROGRAMMER:       Jason Filby (jasonfilby@yahoo.com)
   7 *                   Rex Jolliff (rex@lvcablemodem.com)
   8 *                   Herve Poussineau (reactos@poussine.freesurf.fr)
   9 *                   Pierre Schweitzer (pierre@reactos.org)
  10 */
  11
  12 /*  -------------------------------------------------------  INCLUDES  */
  13
  14 #include "vfat.h"
  15
  16 #define NDEBUG
  17 #include <debug.h>
  18
  19 #ifdef __GNUC__
  20 #include <wctype.h> /* towlower prototype */
  21 #endif
  22
  23 /*  --------------------------------------------------------  DEFINES  */
  24
  25 #define TAG_FCB 'BCFV'
  26
  27 /*  --------------------------------------------------------  PUBLICS  */
  28
  29 static
  30 ULONG
  31 vfatNameHash(
  32     ULONG hash,
  33     PUNICODE_STRING NameU)
  34 {
  35     PWCHAR last;
  36     PWCHAR curr;
  37     register WCHAR c;
  38
  39     // LFN could start from "."
  40     //ASSERT(NameU->Buffer[0] != L'.');
  41     curr = NameU->Buffer;
  42     last = NameU->Buffer + NameU->Length / sizeof(WCHAR);
  43
  44     while(curr < last)
  45     {
  46         c = towlower(*curr++);
  47         hash = (hash + (c << 4) + (c >> 4)) * 11;
  48     }
  49     return hash;
  50 }
  51
  52 VOID
  53 vfatSplitPathName(
  54     PUNICODE_STRING PathNameU,
  55     PUNICODE_STRING DirNameU,
  56     PUNICODE_STRING FileNameU)
  57 {
  58     PWCHAR pName;
  59     USHORT Length = 0;
  60     pName = PathNameU->Buffer + PathNameU->Length / sizeof(WCHAR) - 1;
  61     while (*pName != L'\\' && pName >= PathNameU->Buffer)
  62     {
  63         pName--;
  64         Length++;
  65     }
  66     ASSERT(*pName == L'\\' || pName < PathNameU->Buffer);
  67     if (FileNameU)
  68     {
  69         FileNameU->Buffer = pName + 1;
  70         FileNameU->Length = FileNameU->MaximumLength = Length * sizeof(WCHAR);
  71     }
  72     if (DirNameU)
  73     {
  74         DirNameU->Buffer = PathNameU->Buffer;
  75         DirNameU->Length = (pName + 1 - PathNameU->Buffer) * sizeof(WCHAR);
  76         DirNameU->MaximumLength = DirNameU->Length;
  77     }
  78 }
  79
  80 static
  81 VOID
  82 vfatInitFcb(
  83     PVFATFCB Fcb,
  84     PUNICODE_STRING NameU)
  85 {
  86     USHORT PathNameBufferLength;
  87
  88     if (NameU)
  89         PathNameBufferLength = NameU->Length + sizeof(WCHAR);
  90     else
  91         PathNameBufferLength = 0;
  92
  93     Fcb->PathNameBuffer = ExAllocatePoolWithTag(NonPagedPool, PathNameBufferLength, TAG_FCB);
  94     if (!Fcb->PathNameBuffer)
  95     {
  96         /* FIXME: what to do if no more memory? */
  97         DPRINT1("Unable to initialize FCB for filename '%wZ'\n", NameU);
  98         KeBugCheckEx(FAT_FILE_SYSTEM, (ULONG_PTR)Fcb, (ULONG_PTR)NameU, 0, 0);
  99     }
 100
 101     Fcb->PathNameU.Length = 0;
 102     Fcb->PathNameU.Buffer = Fcb->PathNameBuffer;
 103     Fcb->PathNameU.MaximumLength = PathNameBufferLength;
 104     Fcb->ShortNameU.Length = 0;
 105     Fcb->ShortNameU.Buffer = Fcb->ShortNameBuffer;
 106     Fcb->ShortNameU.MaximumLength = sizeof(Fcb->ShortNameBuffer);
 107     Fcb->DirNameU.Buffer = Fcb->PathNameU.Buffer;
 108     if (NameU && NameU->Length)
 109     {
 110         RtlCopyUnicodeString(&Fcb->PathNameU, NameU);
 111         vfatSplitPathName(&Fcb->PathNameU, &Fcb->DirNameU, &Fcb->LongNameU);
 112     }
 113     else
 114     {
 115         Fcb->DirNameU.Buffer = Fcb->LongNameU.Buffer = NULL;
 116         Fcb->DirNameU.MaximumLength = Fcb->DirNameU.Length = 0;
 117         Fcb->LongNameU.MaximumLength = Fcb->LongNameU.Length = 0;
 118     }
 119     RtlZeroMemory(&Fcb->FCBShareAccess, sizeof(SHARE_ACCESS));
 120     Fcb->OpenHandleCount = 0;
 121 }
 122
 123 PVFATFCB
 124 vfatNewFCB(
 125     PDEVICE_EXTENSION pVCB,
 126     PUNICODE_STRING pFileNameU)
 127 {
 128     PVFATFCB  rcFCB;
 129
 130     DPRINT("'%wZ'\n", pFileNameU);
 131
 132     rcFCB = ExAllocateFromNPagedLookasideList(&VfatGlobalData->FcbLookasideList);
 133     if (rcFCB == NULL)
 134     {
 135         return NULL;
 136     }
 137     RtlZeroMemory(rcFCB, sizeof(VFATFCB));
 138     vfatInitFcb(rcFCB, pFileNameU);
 139     if (pVCB->Flags & VCB_IS_FATX)
 140     {
 141         rcFCB->Flags |= FCB_IS_FATX_ENTRY;
 142         rcFCB->Attributes = &rcFCB->entry.FatX.Attrib;
 143     }
 144     else
 145         rcFCB->Attributes = &rcFCB->entry.Fat.Attrib;
 146     rcFCB->Hash.Hash = vfatNameHash(0, &rcFCB->PathNameU);
 147     rcFCB->Hash.self = rcFCB;
 148     rcFCB->ShortHash.self = rcFCB;
 149     ExInitializeResourceLite(&rcFCB->PagingIoResource);
 150     ExInitializeResourceLite(&rcFCB->MainResource);
 151     FsRtlInitializeFileLock(&rcFCB->FileLock, NULL, NULL);
 152     ExInitializeFastMutex(&rcFCB->LastMutex);
 153     rcFCB->RFCB.PagingIoResource = &rcFCB->PagingIoResource;
 154     rcFCB->RFCB.Resource = &rcFCB->MainResource;
 155     rcFCB->RFCB.IsFastIoPossible = FastIoIsNotPossible;
 156
 157     return  rcFCB;
 158 }
 159
 160 static
 161 VOID
 162 vfatDelFCBFromTable(
 163     PDEVICE_EXTENSION pVCB,
 164     PVFATFCB pFCB)
 165 {
 166     ULONG Index;
 167     ULONG ShortIndex;
 168     HASHENTRY* entry;
 169
 170     Index = pFCB->Hash.Hash % pVCB->HashTableSize;
 171     ShortIndex = pFCB->ShortHash.Hash % pVCB->HashTableSize;
 172
 173     if (pFCB->Hash.Hash != pFCB->ShortHash.Hash)
 174     {
 175         entry = pVCB->FcbHashTable[ShortIndex];
 176         if (entry->self == pFCB)
 177         {
 178             pVCB->FcbHashTable[ShortIndex] = entry->next;
 179         }
 180         else
 181         {
 182             while (entry->next->self != pFCB)
 183             {
 184                 entry = entry->next;
 185             }
 186             entry->next = pFCB->ShortHash.next;
 187         }
 188     }
 189     entry = pVCB->FcbHashTable[Index];
 190     if (entry->self == pFCB)
 191     {
 192         pVCB->FcbHashTable[Index] = entry->next;
 193     }
 194     else
 195     {
 196         while (entry->next->self != pFCB)
 197         {
 198             entry = entry->next;
 199         }
 200         entry->next = pFCB->Hash.next;
 201     }
 202
 203     RemoveEntryList(&pFCB->FcbListEntry);
 204 }
 205
 206 static
 207 NTSTATUS
 208 vfatMakeFullName(
 209     PVFATFCB directoryFCB,
 210     PUNICODE_STRING LongNameU,
 211     PUNICODE_STRING ShortNameU,
 212     PUNICODE_STRING NameU)
 213 {
 214     PWCHAR PathNameBuffer;
 215     USHORT PathNameLength;
 216
 217     PathNameLength = directoryFCB->PathNameU.Length + max(LongNameU->Length, ShortNameU->Length);
 218     if (!vfatFCBIsRoot(directoryFCB))
 219     {
 220         PathNameLength += sizeof(WCHAR);
 221     }
 222
 223     if (PathNameLength > LONGNAME_MAX_LENGTH * sizeof(WCHAR))
 224     {
 225         return  STATUS_OBJECT_NAME_INVALID;
 226     }
 227     PathNameBuffer = ExAllocatePoolWithTag(NonPagedPool, PathNameLength + sizeof(WCHAR), TAG_FCB);
 228     if (!PathNameBuffer)
 229     {
 230         return STATUS_INSUFFICIENT_RESOURCES;
 231     }
 232     NameU->Buffer = PathNameBuffer;
 233     NameU->Length = 0;
 234     NameU->MaximumLength = PathNameLength;
 235
 236     RtlCopyUnicodeString(NameU, &directoryFCB->PathNameU);
 237     if (!vfatFCBIsRoot(directoryFCB))
 238     {
 239         RtlAppendUnicodeToString(NameU, L"\\");
 240     }
 241     if (LongNameU->Length > 0)
 242     {
 243         RtlAppendUnicodeStringToString(NameU, LongNameU);
 244     }
 245     else
 246     {
 247         RtlAppendUnicodeStringToString(NameU, ShortNameU);
 248     }
 249     NameU->Buffer[NameU->Length / sizeof(WCHAR)] = 0;
 250
 251     return STATUS_SUCCESS;
 252 }
 253
 254 VOID
 255 vfatDestroyCCB(
 256     PVFATCCB pCcb)
 257 {
 258     if (pCcb->SearchPattern.Buffer)
 259     {
 260         ExFreePoolWithTag(pCcb->SearchPattern.Buffer, TAG_VFAT);
 261     }
 262     ExFreeToNPagedLookasideList(&VfatGlobalData->CcbLookasideList, pCcb);
 263 }
 264
 265 VOID
 266 vfatDestroyFCB(
 267     PVFATFCB pFCB)
 268 {
 269     FsRtlUninitializeFileLock(&pFCB->FileLock);
 270     ExFreePool(pFCB->PathNameBuffer);
 271     ExDeleteResourceLite(&pFCB->PagingIoResource);
 272     ExDeleteResourceLite(&pFCB->MainResource);
 273     ExFreeToNPagedLookasideList(&VfatGlobalData->FcbLookasideList, pFCB);
 274 }
 275
 276 BOOLEAN
 277 vfatFCBIsDirectory(
 278     PVFATFCB FCB)
 279 {
 280     return ((*FCB->Attributes & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY);
 281 }
 282
 283 BOOLEAN
 284 vfatFCBIsRoot(
 285     PVFATFCB FCB)
 286 {
 287     return FCB->PathNameU.Length == sizeof(WCHAR) && FCB->PathNameU.Buffer[0] == L'\\' ? TRUE : FALSE;
 288 }
 289
 290 VOID
 291 vfatGrabFCB(
 292     PDEVICE_EXTENSION pVCB,
 293     PVFATFCB pFCB)
 294 {
 295     ASSERT(ExIsResourceAcquiredExclusive(&pVCB->DirResource));
 296
 297     ++pFCB->RefCount;
 298 }
 299
 300 VOID
 301 vfatReleaseFCB(
 302     PDEVICE_EXTENSION pVCB,
 303     PVFATFCB pFCB)
 304 {
 305     PVFATFCB tmpFcb;
 306
 307     DPRINT("releasing FCB at %p: %wZ, refCount:%d\n",
 308            pFCB, &pFCB->PathNameU, pFCB->RefCount);
 309
 310     ASSERT(ExIsResourceAcquiredExclusive(&pVCB->DirResource));
 311
 312     while (pFCB)
 313     {
 314         pFCB->RefCount--;
 315         if (pFCB->RefCount == 0)
 316         {
 317             ASSERT(pFCB->OpenHandleCount == 0);
 318             tmpFcb = pFCB->parentFcb;
 319             vfatDelFCBFromTable(pVCB, pFCB);
 320             vfatDestroyFCB(pFCB);
 321         }
 322         else
 323         {
 324             tmpFcb = NULL;
 325         }
 326         pFCB = tmpFcb;
 327     }
 328 }
 329
 330 static
 331 VOID
 332 vfatAddFCBToTable(
 333     PDEVICE_EXTENSION pVCB,
 334     PVFATFCB pFCB)
 335 {
 336     ULONG Index;
 337     ULONG ShortIndex;
 338
 339     Index = pFCB->Hash.Hash % pVCB->HashTableSize;
 340     ShortIndex = pFCB->ShortHash.Hash % pVCB->HashTableSize;
 341
 342     InsertTailList(&pVCB->FcbListHead, &pFCB->FcbListEntry);
 343
 344     pFCB->Hash.next = pVCB->FcbHashTable[Index];
 345     pVCB->FcbHashTable[Index] = &pFCB->Hash;
 346     if (pFCB->Hash.Hash != pFCB->ShortHash.Hash)
 347     {
 348         pFCB->ShortHash.next = pVCB->FcbHashTable[ShortIndex];
 349         pVCB->FcbHashTable[ShortIndex] = &pFCB->ShortHash;
 350     }
 351     if (pFCB->parentFcb)
 352     {
 353         vfatGrabFCB(pVCB, pFCB->parentFcb);
 354     }
 355 }
 356
 357 NTSTATUS
 358 vfatUpdateFCB(
 359     PDEVICE_EXTENSION pVCB,
 360     PVFATFCB Fcb,
 361     PUNICODE_STRING LongName,
 362     PUNICODE_STRING ShortName,
 363     PVFATFCB ParentFcb)
 364 {
 365     NTSTATUS Status;
 366     PVFATFCB OldParent;
 367
 368     DPRINT("vfatUpdateFCB(%p, %p, %wZ, %wZ, %p)\n", pVCB, Fcb, LongName, ShortName, ParentFcb);
 369
 370     /* Delete old name */
 371     if (Fcb->PathNameBuffer)
 372     {
 373         ExFreePoolWithTag(Fcb->PathNameBuffer, TAG_FCB);
 374     }
 375
 376     /* Delete from table */
 377     vfatDelFCBFromTable(pVCB, Fcb);
 378
 379     /* Get full path name */
 380     Status = vfatMakeFullName(ParentFcb, LongName, ShortName, &Fcb->PathNameU);
 381     if (!NT_SUCCESS(Status))
 382     {
 383         return Status;
 384     }
 385
 386     /* Split it properly */
 387     Fcb->PathNameBuffer = Fcb->PathNameU.Buffer;
 388     Fcb->DirNameU.Buffer = Fcb->PathNameU.Buffer;
 389     vfatSplitPathName(&Fcb->PathNameU, &Fcb->DirNameU, &Fcb->LongNameU);
 390
 391     /* Copy short name */
 392     RtlCopyUnicodeString(&Fcb->ShortNameU, ShortName);
 393
 394     /* Recompute hashes */
 395     Fcb->Hash.Hash = vfatNameHash(0, &Fcb->PathNameU);
 396     if (pVCB->Flags & VCB_IS_FATX)
 397     {
 398         Fcb->ShortHash.Hash = Fcb->Hash.Hash;
 399     }
 400     else
 401     {
 402         Fcb->ShortHash.Hash = vfatNameHash(0, &Fcb->DirNameU);
 403         Fcb->ShortHash.Hash = vfatNameHash(Fcb->ShortHash.Hash, &Fcb->ShortNameU);
 404     }
 405
 406     /* Set parent */
 407     OldParent = Fcb->parentFcb;
 408     Fcb->parentFcb = ParentFcb;
 409
 410     /* Add to the table */
 411     vfatAddFCBToTable(pVCB, Fcb);
 412
 413     /* If we moved accross directories, dereferenced our old parent
 414      * We also derefence in case we're just renaming since AddFCBToTable references it
 415      */
 416     vfatReleaseFCB(pVCB, OldParent);
 417
 418     return STATUS_SUCCESS;
 419 }
 420
 421 PVFATFCB
 422 vfatGrabFCBFromTable(
 423     PDEVICE_EXTENSION pVCB,
 424     PUNICODE_STRING PathNameU)
 425 {
 426     PVFATFCB  rcFCB;
 427     ULONG Hash;
 428     UNICODE_STRING DirNameU;
 429     UNICODE_STRING FileNameU;
 430     PUNICODE_STRING FcbNameU;
 431
 432     HASHENTRY* entry;
 433
 434     DPRINT("'%wZ'\n", PathNameU);
 435
 436     Hash = vfatNameHash(0, PathNameU);
 437
 438     entry = pVCB->FcbHashTable[Hash % pVCB->HashTableSize];
 439     if (entry)
 440     {
 441         vfatSplitPathName(PathNameU, &DirNameU, &FileNameU);
 442     }
 443
 444     while (entry)
 445     {
 446         if (entry->Hash == Hash)
 447         {
 448             rcFCB = entry->self;
 449             DPRINT("'%wZ' '%wZ'\n", &DirNameU, &rcFCB->DirNameU);
 450             if (RtlEqualUnicodeString(&DirNameU, &rcFCB->DirNameU, TRUE))
 451             {
 452                 if (rcFCB->Hash.Hash == Hash)
 453                 {
 454                     FcbNameU = &rcFCB->LongNameU;
 455                 }
 456                 else
 457                 {
 458                     FcbNameU = &rcFCB->ShortNameU;
 459                 }
 460                 /* compare the file name */
 461                 DPRINT("'%wZ' '%wZ'\n", &FileNameU, FcbNameU);
 462                 if (RtlEqualUnicodeString(&FileNameU, FcbNameU, TRUE))
 463                 {
 464                     vfatGrabFCB(pVCB, rcFCB);
 465                     return rcFCB;
 466                 }
 467             }
 468         }
 469         entry = entry->next;
 470     }
 471     return NULL;
 472 }
 473
 474 static
 475 NTSTATUS
 476 vfatFCBInitializeCacheFromVolume(
 477     PVCB vcb,
 478     PVFATFCB fcb)
 479 {
 480     PFILE_OBJECT fileObject;
 481     PVFATCCB newCCB;
 482     NTSTATUS status;
 483
 484     fileObject = IoCreateStreamFileObject (NULL, vcb->StorageDevice);
 485
 486     newCCB = ExAllocateFromNPagedLookasideList(&VfatGlobalData->CcbLookasideList);
 487     if (newCCB == NULL)
 488     {
 489         ObDereferenceObject(fileObject);
 490         return STATUS_INSUFFICIENT_RESOURCES;
 491     }
 492     RtlZeroMemory(newCCB, sizeof (VFATCCB));
 493
 494     fileObject->SectionObjectPointer = &fcb->SectionObjectPointers;
 495     fileObject->FsContext = fcb;
 496     fileObject->FsContext2 = newCCB;
 497     fcb->FileObject = fileObject;
 498     vfatGrabFCB(vcb, fcb);
 499
 500     _SEH2_TRY
 501     {
 502         CcInitializeCacheMap(fileObject,
 503                              (PCC_FILE_SIZES)(&fcb->RFCB.AllocationSize),
 504                              TRUE,
 505                              &VfatGlobalData->CacheMgrCallbacks,
 506                              fcb);
 507     }
 508     _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 509     {
 510         status = _SEH2_GetExceptionCode();
 511         fcb->RefCount--;
 512         fcb->FileObject = NULL;
 513         ExFreeToNPagedLookasideList(&VfatGlobalData->CcbLookasideList, newCCB);
 514         ObDereferenceObject(fileObject);
 515         return status;
 516     }
 517     _SEH2_END;
 518
 519     fcb->Flags |= FCB_CACHE_INITIALIZED;
 520     return STATUS_SUCCESS;
 521 }
 522
 523 PVFATFCB
 524 vfatMakeRootFCB(
 525     PDEVICE_EXTENSION pVCB)
 526 {
 527     PVFATFCB FCB;
 528     ULONG FirstCluster, CurrentCluster, Size = 0;
 529     NTSTATUS Status = STATUS_SUCCESS;
 530     UNICODE_STRING NameU = RTL_CONSTANT_STRING(L"\\");
 531
 532     FCB = vfatNewFCB(pVCB, &NameU);
 533     if (FCB->Flags & FCB_IS_FATX_ENTRY)
 534     {
 535         memset(FCB->entry.FatX.Filename, ' ', 42);
 536         FCB->entry.FatX.FileSize = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
 537         FCB->entry.FatX.Attrib = FILE_ATTRIBUTE_DIRECTORY;
 538         FCB->entry.FatX.FirstCluster = 1;
 539         Size = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
 540     }
 541     else
 542     {
 543         memset(FCB->entry.Fat.ShortName, ' ', 11);
 544         FCB->entry.Fat.FileSize = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
 545         FCB->entry.Fat.Attrib = FILE_ATTRIBUTE_DIRECTORY;
 546         if (pVCB->FatInfo.FatType == FAT32)
 547         {
 548             CurrentCluster = FirstCluster = pVCB->FatInfo.RootCluster;
 549             FCB->entry.Fat.FirstCluster = (unsigned short)(FirstCluster & 0xffff);
 550             FCB->entry.Fat.FirstClusterHigh = (unsigned short)(FirstCluster >> 16);
 551
 552             while (CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
 553             {
 554                 Size += pVCB->FatInfo.BytesPerCluster;
 555                 Status = NextCluster (pVCB, FirstCluster, &CurrentCluster, FALSE);
 556             }
 557         }
 558         else
 559         {
 560             FCB->entry.Fat.FirstCluster = 1;
 561             Size = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
 562         }
 563     }
 564     FCB->ShortHash.Hash = FCB->Hash.Hash;
 565     FCB->RefCount = 2;
 566     FCB->dirIndex = 0;
 567     FCB->RFCB.FileSize.QuadPart = Size;
 568     FCB->RFCB.ValidDataLength.QuadPart = Size;
 569     FCB->RFCB.AllocationSize.QuadPart = Size;
 570     FCB->RFCB.IsFastIoPossible = FastIoIsNotPossible;
 571
 572     vfatFCBInitializeCacheFromVolume(pVCB, FCB);
 573     vfatAddFCBToTable(pVCB, FCB);
 574
 575     return FCB;
 576 }
 577
 578 PVFATFCB
 579 vfatOpenRootFCB(
 580     PDEVICE_EXTENSION pVCB)
 581 {
 582     PVFATFCB FCB;
 583     UNICODE_STRING NameU = RTL_CONSTANT_STRING(L"\\");
 584
 585     FCB = vfatGrabFCBFromTable(pVCB, &NameU);
 586     if (FCB == NULL)
 587     {
 588         FCB = vfatMakeRootFCB(pVCB);
 589     }
 590
 591     return FCB;
 592 }
 593
 594 NTSTATUS
 595 vfatMakeFCBFromDirEntry(
 596     PVCB vcb,
 597     PVFATFCB directoryFCB,
 598     PVFAT_DIRENTRY_CONTEXT DirContext,
 599     PVFATFCB *fileFCB)
 600 {
 601     PVFATFCB rcFCB;
 602     ULONG Size;
 603     UNICODE_STRING NameU;
 604     NTSTATUS Status;
 605
 606     Status = vfatMakeFullName(directoryFCB, &DirContext->LongNameU, &DirContext->ShortNameU, &NameU);
 607     if (!NT_SUCCESS(Status))
 608     {
 609         return Status;
 610     }
 611
 612     rcFCB = vfatNewFCB(vcb, &NameU);
 613     RtlCopyMemory(&rcFCB->entry, &DirContext->DirEntry, sizeof (DIR_ENTRY));
 614     RtlCopyUnicodeString(&rcFCB->ShortNameU, &DirContext->ShortNameU);
 615     if (vcb->Flags & VCB_IS_FATX)
 616     {
 617         rcFCB->ShortHash.Hash = rcFCB->Hash.Hash;
 618     }
 619     else
 620     {
 621         rcFCB->ShortHash.Hash = vfatNameHash(0, &rcFCB->DirNameU);
 622         rcFCB->ShortHash.Hash = vfatNameHash(rcFCB->ShortHash.Hash, &rcFCB->ShortNameU);
 623     }
 624
 625     if (vfatFCBIsDirectory(rcFCB))
 626     {
 627         ULONG FirstCluster, CurrentCluster;
 628         NTSTATUS Status = STATUS_SUCCESS;
 629         Size = 0;
 630         FirstCluster = vfatDirEntryGetFirstCluster(vcb, &rcFCB->entry);
 631         if (FirstCluster == 1)
 632         {
 633             Size = vcb->FatInfo.rootDirectorySectors * vcb->FatInfo.BytesPerSector;
 634         }
 635         else if (FirstCluster != 0)
 636         {
 637             CurrentCluster = FirstCluster;
 638             while (CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
 639             {
 640                 Size += vcb->FatInfo.BytesPerCluster;
 641                 Status = NextCluster(vcb, FirstCluster, &CurrentCluster, FALSE);
 642             }
 643         }
 644     }
 645     else if (rcFCB->Flags & FCB_IS_FATX_ENTRY)
 646     {
 647         Size = rcFCB->entry.FatX.FileSize;
 648     }
 649     else
 650     {
 651         Size = rcFCB->entry.Fat.FileSize;
 652     }
 653     rcFCB->dirIndex = DirContext->DirIndex;
 654     rcFCB->startIndex = DirContext->StartIndex;
 655     if ((rcFCB->Flags & FCB_IS_FATX_ENTRY) && !vfatFCBIsRoot(directoryFCB))
 656     {
 657         ASSERT(DirContext->DirIndex >= 2 && DirContext->StartIndex >= 2);
 658         rcFCB->dirIndex = DirContext->DirIndex-2;
 659         rcFCB->startIndex = DirContext->StartIndex-2;
 660     }
 661     rcFCB->RFCB.FileSize.QuadPart = Size;
 662     rcFCB->RFCB.ValidDataLength.QuadPart = Size;
 663     rcFCB->RFCB.AllocationSize.QuadPart = ROUND_UP(Size, vcb->FatInfo.BytesPerCluster);
 664     vfatGrabFCB(vcb, rcFCB);
 665     if (vfatFCBIsDirectory(rcFCB))
 666     {
 667         vfatFCBInitializeCacheFromVolume(vcb, rcFCB);
 668     }
 669     rcFCB->parentFcb = directoryFCB;
 670     vfatAddFCBToTable(vcb, rcFCB);
 671     *fileFCB = rcFCB;
 672
 673     ExFreePool(NameU.Buffer);
 674     return STATUS_SUCCESS;
 675 }
 676
 677 NTSTATUS
 678 vfatAttachFCBToFileObject(
 679     PDEVICE_EXTENSION vcb,
 680     PVFATFCB fcb,
 681     PFILE_OBJECT fileObject)
 682 {
 683     PVFATCCB newCCB;
 684
 685     UNREFERENCED_PARAMETER(vcb);
 686
 687     newCCB = ExAllocateFromNPagedLookasideList(&VfatGlobalData->CcbLookasideList);
 688     if (newCCB == NULL)
 689     {
 690         return  STATUS_INSUFFICIENT_RESOURCES;
 691     }
 692     RtlZeroMemory(newCCB, sizeof (VFATCCB));
 693
 694     fileObject->SectionObjectPointer = &fcb->SectionObjectPointers;
 695     fileObject->FsContext = fcb;
 696     fileObject->FsContext2 = newCCB;
 697     DPRINT("file open: fcb:%p PathName:%wZ\n", fcb, &fcb->PathNameU);
 698
 699     return STATUS_SUCCESS;
 700 }
 701
 702 NTSTATUS
 703 vfatDirFindFile(
 704     PDEVICE_EXTENSION pDeviceExt,
 705     PVFATFCB pDirectoryFCB,
 706     PUNICODE_STRING FileToFindU,
 707     PVFATFCB *pFoundFCB)
 708 {
 709     NTSTATUS status;
 710     PVOID Context = NULL;
 711     PVOID Page = NULL;
 712     BOOLEAN First = TRUE;
 713     VFAT_DIRENTRY_CONTEXT DirContext;
 714     /* This buffer must have a size of 260 characters, because
 715     vfatMakeFCBFromDirEntry can copy 20 name entries with 13 characters. */
 716     WCHAR LongNameBuffer[260];
 717     WCHAR ShortNameBuffer[13];
 718     BOOLEAN FoundLong = FALSE;
 719     BOOLEAN FoundShort = FALSE;
 720
 721     ASSERT(pDeviceExt);
 722     ASSERT(pDirectoryFCB);
 723     ASSERT(FileToFindU);
 724
 725     DPRINT("vfatDirFindFile(VCB:%p, dirFCB:%p, File:%wZ)\n",
 726            pDeviceExt, pDirectoryFCB, FileToFindU);
 727     DPRINT("Dir Path:%wZ\n", &pDirectoryFCB->PathNameU);
 728
 729     DirContext.DirIndex = 0;
 730     DirContext.LongNameU.Buffer = LongNameBuffer;
 731     DirContext.LongNameU.Length = 0;
 732     DirContext.LongNameU.MaximumLength = sizeof(LongNameBuffer);
 733     DirContext.ShortNameU.Buffer = ShortNameBuffer;
 734     DirContext.ShortNameU.Length = 0;
 735     DirContext.ShortNameU.MaximumLength = sizeof(ShortNameBuffer);
 736
 737     while (TRUE)
 738     {
 739         status = pDeviceExt->GetNextDirEntry(&Context,
 740             &Page,
 741             pDirectoryFCB,
 742             &DirContext,
 743             First);
 744         First = FALSE;
 745         if (status == STATUS_NO_MORE_ENTRIES)
 746         {
 747             return STATUS_OBJECT_NAME_NOT_FOUND;
 748         }
 749         if (!NT_SUCCESS(status))
 750         {
 751             return status;
 752         }
 753
 754         DPRINT("  Index:%u  longName:%wZ\n",
 755                DirContext.DirIndex, &DirContext.LongNameU);
 756
 757         if (!ENTRY_VOLUME(pDeviceExt, &DirContext.DirEntry))
 758         {
 759             FoundLong = RtlEqualUnicodeString(FileToFindU, &DirContext.LongNameU, TRUE);
 760             if (FoundLong == FALSE)
 761             {
 762                 FoundShort = RtlEqualUnicodeString(FileToFindU, &DirContext.ShortNameU, TRUE);
 763             }
 764             if (FoundLong || FoundShort)
 765             {
 766                 status = vfatMakeFCBFromDirEntry(pDeviceExt,
 767                     pDirectoryFCB,
 768                     &DirContext,
 769                     pFoundFCB);
 770                 CcUnpinData(Context);
 771                 return status;
 772             }
 773         }
 774         DirContext.DirIndex++;
 775     }
 776
 777     return STATUS_OBJECT_NAME_NOT_FOUND;
 778 }
 779
 780 NTSTATUS
 781 vfatGetFCBForFile(
 782     PDEVICE_EXTENSION pVCB,
 783     PVFATFCB *pParentFCB,
 784     PVFATFCB *pFCB,
 785     PUNICODE_STRING pFileNameU)
 786 {
 787     NTSTATUS status;
 788     PVFATFCB FCB = NULL;
 789     PVFATFCB parentFCB;
 790     UNICODE_STRING NameU;
 791     UNICODE_STRING RootNameU = RTL_CONSTANT_STRING(L"\\");
 792     UNICODE_STRING FileNameU;
 793     WCHAR NameBuffer[260];
 794     PWCHAR curr, prev, last;
 795     ULONG Length;
 796
 797     DPRINT("vfatGetFCBForFile (%p,%p,%p,%wZ)\n",
 798            pVCB, pParentFCB, pFCB, pFileNameU);
 799
 800     FileNameU.Buffer = NameBuffer;
 801     FileNameU.MaximumLength = sizeof(NameBuffer);
 802     RtlCopyUnicodeString(&FileNameU, pFileNameU);
 803
 804     parentFCB = *pParentFCB;
 805
 806     if (parentFCB == NULL)
 807     {
 808         //  Trivial case, open of the root directory on volume
 809         if (RtlEqualUnicodeString(&FileNameU, &RootNameU, FALSE))
 810         {
 811             DPRINT("returning root FCB\n");
 812
 813             FCB = vfatOpenRootFCB(pVCB);
 814             *pFCB = FCB;
 815             *pParentFCB = NULL;
 816
 817             return (FCB != NULL) ? STATUS_SUCCESS : STATUS_OBJECT_PATH_NOT_FOUND;
 818         }
 819
 820         /* Check for an existing FCB */
 821         FCB = vfatGrabFCBFromTable(pVCB, &FileNameU);
 822         if (FCB)
 823         {
 824             *pFCB = FCB;
 825             *pParentFCB = FCB->parentFcb;
 826             vfatGrabFCB(pVCB, *pParentFCB);
 827             return STATUS_SUCCESS;
 828         }
 829
 830         last = curr = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
 831         while (*curr != L'\\' && curr > FileNameU.Buffer)
 832         {
 833             curr--;
 834         }
 835
 836         if (curr > FileNameU.Buffer)
 837         {
 838             NameU.Buffer = FileNameU.Buffer;
 839             NameU.MaximumLength = NameU.Length = (curr - FileNameU.Buffer) * sizeof(WCHAR);
 840             FCB = vfatGrabFCBFromTable(pVCB, &NameU);
 841             if (FCB)
 842             {
 843                 Length = (curr - FileNameU.Buffer) * sizeof(WCHAR);
 844                 if (Length != FCB->PathNameU.Length)
 845                 {
 846                     if (FileNameU.Length + FCB->PathNameU.Length - Length > FileNameU.MaximumLength)
 847                     {
 848                         vfatReleaseFCB(pVCB, FCB);
 849                         return STATUS_OBJECT_NAME_INVALID;
 850                     }
 851                     RtlMoveMemory(FileNameU.Buffer + FCB->PathNameU.Length / sizeof(WCHAR),
 852                         curr, FileNameU.Length - Length);
 853                     FileNameU.Length += (USHORT)(FCB->PathNameU.Length - Length);
 854                     curr = FileNameU.Buffer + FCB->PathNameU.Length / sizeof(WCHAR);
 855                     last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
 856                 }
 857                 RtlCopyMemory(FileNameU.Buffer, FCB->PathNameU.Buffer, FCB->PathNameU.Length);
 858             }
 859         }
 860         else
 861         {
 862             FCB = NULL;
 863         }
 864
 865         if (FCB == NULL)
 866         {
 867             FCB = vfatOpenRootFCB(pVCB);
 868             curr = FileNameU.Buffer;
 869         }
 870
 871         parentFCB = NULL;
 872         prev = curr;
 873     }
 874     else
 875     {
 876         FCB = parentFCB;
 877         parentFCB = NULL;
 878         prev = curr = FileNameU.Buffer - 1;
 879         last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
 880     }
 881
 882     while (curr <= last)
 883     {
 884         if (parentFCB)
 885         {
 886             vfatReleaseFCB(pVCB, parentFCB);
 887             parentFCB = 0;
 888         }
 889         //  fail if element in FCB is not a directory
 890         if (!vfatFCBIsDirectory(FCB))
 891         {
 892             DPRINT ("Element in requested path is not a directory\n");
 893
 894             vfatReleaseFCB(pVCB, FCB);
 895             FCB = NULL;
 896             *pParentFCB = NULL;
 897             *pFCB = NULL;
 898
 899             return  STATUS_OBJECT_PATH_NOT_FOUND;
 900         }
 901         parentFCB = FCB;
 902         if (prev < curr)
 903         {
 904             Length = (curr - prev) * sizeof(WCHAR);
 905             if (Length != parentFCB->LongNameU.Length)
 906             {
 907                 if (FileNameU.Length + parentFCB->LongNameU.Length - Length > FileNameU.MaximumLength)
 908                 {
 909                     vfatReleaseFCB(pVCB, parentFCB);
 910                     return STATUS_OBJECT_NAME_INVALID;
 911                 }
 912                 RtlMoveMemory(prev + parentFCB->LongNameU.Length / sizeof(WCHAR), curr,
 913                     FileNameU.Length - (curr - FileNameU.Buffer) * sizeof(WCHAR));
 914                 FileNameU.Length += (USHORT)(parentFCB->LongNameU.Length - Length);
 915                 curr = prev + parentFCB->LongNameU.Length / sizeof(WCHAR);
 916                 last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
 917             }
 918             RtlCopyMemory(prev, parentFCB->LongNameU.Buffer, parentFCB->LongNameU.Length);
 919         }
 920         curr++;
 921         prev = curr;
 922         while (*curr != L'\\' && curr <= last)
 923         {
 924             curr++;
 925         }
 926         NameU.Buffer = FileNameU.Buffer;
 927         NameU.Length = (curr - NameU.Buffer) * sizeof(WCHAR);
 928         NameU.MaximumLength = FileNameU.MaximumLength;
 929         DPRINT("%wZ\n", &NameU);
 930         FCB = vfatGrabFCBFromTable(pVCB, &NameU);
 931         if (FCB == NULL)
 932         {
 933             NameU.Buffer = prev;
 934             NameU.MaximumLength = NameU.Length = (curr - prev) * sizeof(WCHAR);
 935             status = vfatDirFindFile(pVCB, parentFCB, &NameU, &FCB);
 936             if (status == STATUS_OBJECT_NAME_NOT_FOUND)
 937             {
 938                 *pFCB = NULL;
 939                 if (curr > last)
 940                 {
 941                     *pParentFCB = parentFCB;
 942                     return STATUS_OBJECT_NAME_NOT_FOUND;
 943                 }
 944                 else
 945                 {
 946                     vfatReleaseFCB(pVCB, parentFCB);
 947                     *pParentFCB = NULL;
 948                     return STATUS_OBJECT_PATH_NOT_FOUND;
 949                 }
 950             }
 951             else if (!NT_SUCCESS(status))
 952             {
 953                 vfatReleaseFCB(pVCB, parentFCB);
 954                 *pParentFCB = NULL;
 955                 *pFCB = NULL;
 956
 957                 return status;
 958             }
 959         }
 960     }
 961
 962     *pParentFCB = parentFCB;
 963     *pFCB = FCB;
 964
 965     return STATUS_SUCCESS;
 966 }