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     ASSERT(pFCB != pVCB->VolumeFcb);
 298     ASSERT(pFCB->RefCount > 0);
 299     ++pFCB->RefCount;
 300 }
 301
 302 VOID
 303 vfatReleaseFCB(
 304     PDEVICE_EXTENSION pVCB,
 305     PVFATFCB pFCB)
 306 {
 307     PVFATFCB tmpFcb;
 308
 309     DPRINT("releasing FCB at %p: %wZ, refCount:%d\n",
 310            pFCB, &pFCB->PathNameU, pFCB->RefCount);
 311
 312     ASSERT(ExIsResourceAcquiredExclusive(&pVCB->DirResource));
 313
 314     while (pFCB)
 315     {
 316         ASSERT(pFCB != pVCB->VolumeFcb);
 317         ASSERT(pFCB->RefCount > 0);
 318         pFCB->RefCount--;
 319         if (pFCB->RefCount == 0)
 320         {
 321             ASSERT(pFCB->OpenHandleCount == 0);
 322             tmpFcb = pFCB->parentFcb;
 323             vfatDelFCBFromTable(pVCB, pFCB);
 324             vfatDestroyFCB(pFCB);
 325         }
 326         else
 327         {
 328             tmpFcb = NULL;
 329         }
 330         pFCB = tmpFcb;
 331     }
 332 }
 333
 334 static
 335 VOID
 336 vfatAddFCBToTable(
 337     PDEVICE_EXTENSION pVCB,
 338     PVFATFCB pFCB)
 339 {
 340     ULONG Index;
 341     ULONG ShortIndex;
 342
 343     Index = pFCB->Hash.Hash % pVCB->HashTableSize;
 344     ShortIndex = pFCB->ShortHash.Hash % pVCB->HashTableSize;
 345
 346     InsertTailList(&pVCB->FcbListHead, &pFCB->FcbListEntry);
 347
 348     pFCB->Hash.next = pVCB->FcbHashTable[Index];
 349     pVCB->FcbHashTable[Index] = &pFCB->Hash;
 350     if (pFCB->Hash.Hash != pFCB->ShortHash.Hash)
 351     {
 352         pFCB->ShortHash.next = pVCB->FcbHashTable[ShortIndex];
 353         pVCB->FcbHashTable[ShortIndex] = &pFCB->ShortHash;
 354     }
 355     if (pFCB->parentFcb)
 356     {
 357         vfatGrabFCB(pVCB, pFCB->parentFcb);
 358     }
 359 }
 360
 361 NTSTATUS
 362 vfatUpdateFCB(
 363     PDEVICE_EXTENSION pVCB,
 364     PVFATFCB Fcb,
 365     PUNICODE_STRING LongName,
 366     PUNICODE_STRING ShortName,
 367     PVFATFCB ParentFcb)
 368 {
 369     NTSTATUS Status;
 370     PVFATFCB OldParent;
 371
 372     DPRINT("vfatUpdateFCB(%p, %p, %wZ, %wZ, %p)\n", pVCB, Fcb, LongName, ShortName, ParentFcb);
 373
 374     /* Get full path name */
 375     Status = vfatMakeFullName(ParentFcb, LongName, ShortName, &Fcb->PathNameU);
 376     if (!NT_SUCCESS(Status))
 377     {
 378         return Status;
 379     }
 380
 381     /* Delete old name */
 382     if (Fcb->PathNameBuffer)
 383     {
 384         ExFreePoolWithTag(Fcb->PathNameBuffer, TAG_FCB);
 385     }
 386
 387     /* Delete from table */
 388     vfatDelFCBFromTable(pVCB, Fcb);
 389
 390     /* Split it properly */
 391     Fcb->PathNameBuffer = Fcb->PathNameU.Buffer;
 392     Fcb->DirNameU.Buffer = Fcb->PathNameU.Buffer;
 393     vfatSplitPathName(&Fcb->PathNameU, &Fcb->DirNameU, &Fcb->LongNameU);
 394
 395     /* Copy short name */
 396     RtlCopyUnicodeString(&Fcb->ShortNameU, ShortName);
 397
 398     /* Recompute hashes */
 399     Fcb->Hash.Hash = vfatNameHash(0, &Fcb->PathNameU);
 400     if (pVCB->Flags & VCB_IS_FATX)
 401     {
 402         Fcb->ShortHash.Hash = Fcb->Hash.Hash;
 403     }
 404     else
 405     {
 406         Fcb->ShortHash.Hash = vfatNameHash(0, &Fcb->DirNameU);
 407         Fcb->ShortHash.Hash = vfatNameHash(Fcb->ShortHash.Hash, &Fcb->ShortNameU);
 408     }
 409
 410     /* Set parent */
 411     OldParent = Fcb->parentFcb;
 412     Fcb->parentFcb = ParentFcb;
 413
 414     /* Add to the table */
 415     vfatAddFCBToTable(pVCB, Fcb);
 416
 417     /* If we moved across directories, dereference our old parent
 418      * We also dereference in case we're just renaming since AddFCBToTable references it
 419      */
 420     vfatReleaseFCB(pVCB, OldParent);
 421
 422     return STATUS_SUCCESS;
 423 }
 424
 425 PVFATFCB
 426 vfatGrabFCBFromTable(
 427     PDEVICE_EXTENSION pVCB,
 428     PUNICODE_STRING PathNameU)
 429 {
 430     PVFATFCB  rcFCB;
 431     ULONG Hash;
 432     UNICODE_STRING DirNameU;
 433     UNICODE_STRING FileNameU;
 434     PUNICODE_STRING FcbNameU;
 435
 436     HASHENTRY* entry;
 437
 438     DPRINT("'%wZ'\n", PathNameU);
 439
 440     Hash = vfatNameHash(0, PathNameU);
 441
 442     entry = pVCB->FcbHashTable[Hash % pVCB->HashTableSize];
 443     if (entry)
 444     {
 445         vfatSplitPathName(PathNameU, &DirNameU, &FileNameU);
 446     }
 447
 448     while (entry)
 449     {
 450         if (entry->Hash == Hash)
 451         {
 452             rcFCB = entry->self;
 453             DPRINT("'%wZ' '%wZ'\n", &DirNameU, &rcFCB->DirNameU);
 454             if (RtlEqualUnicodeString(&DirNameU, &rcFCB->DirNameU, TRUE))
 455             {
 456                 if (rcFCB->Hash.Hash == Hash)
 457                 {
 458                     FcbNameU = &rcFCB->LongNameU;
 459                 }
 460                 else
 461                 {
 462                     FcbNameU = &rcFCB->ShortNameU;
 463                 }
 464                 /* compare the file name */
 465                 DPRINT("'%wZ' '%wZ'\n", &FileNameU, FcbNameU);
 466                 if (RtlEqualUnicodeString(&FileNameU, FcbNameU, TRUE))
 467                 {
 468                     vfatGrabFCB(pVCB, rcFCB);
 469                     return rcFCB;
 470                 }
 471             }
 472         }
 473         entry = entry->next;
 474     }
 475     return NULL;
 476 }
 477
 478 static
 479 NTSTATUS
 480 vfatFCBInitializeCacheFromVolume(
 481     PVCB vcb,
 482     PVFATFCB fcb)
 483 {
 484     PFILE_OBJECT fileObject;
 485     PVFATCCB newCCB;
 486     NTSTATUS status;
 487
 488     fileObject = IoCreateStreamFileObject (NULL, vcb->StorageDevice);
 489
 490     newCCB = ExAllocateFromNPagedLookasideList(&VfatGlobalData->CcbLookasideList);
 491     if (newCCB == NULL)
 492     {
 493         ObDereferenceObject(fileObject);
 494         return STATUS_INSUFFICIENT_RESOURCES;
 495     }
 496     RtlZeroMemory(newCCB, sizeof (VFATCCB));
 497
 498     fileObject->SectionObjectPointer = &fcb->SectionObjectPointers;
 499     fileObject->FsContext = fcb;
 500     fileObject->FsContext2 = newCCB;
 501     fcb->FileObject = fileObject;
 502
 503     _SEH2_TRY
 504     {
 505         CcInitializeCacheMap(fileObject,
 506                              (PCC_FILE_SIZES)(&fcb->RFCB.AllocationSize),
 507                              TRUE,
 508                              &VfatGlobalData->CacheMgrCallbacks,
 509                              fcb);
 510     }
 511     _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 512     {
 513         status = _SEH2_GetExceptionCode();
 514         fcb->FileObject = NULL;
 515         ExFreeToNPagedLookasideList(&VfatGlobalData->CcbLookasideList, newCCB);
 516         ObDereferenceObject(fileObject);
 517         return status;
 518     }
 519     _SEH2_END;
 520
 521     vfatGrabFCB(vcb, fcb);
 522     fcb->Flags |= FCB_CACHE_INITIALIZED;
 523     return STATUS_SUCCESS;
 524 }
 525
 526 PVFATFCB
 527 vfatMakeRootFCB(
 528     PDEVICE_EXTENSION pVCB)
 529 {
 530     PVFATFCB FCB;
 531     ULONG FirstCluster, CurrentCluster, Size = 0;
 532     NTSTATUS Status = STATUS_SUCCESS;
 533     UNICODE_STRING NameU = RTL_CONSTANT_STRING(L"\\");
 534
 535     FCB = vfatNewFCB(pVCB, &NameU);
 536     if (FCB->Flags & FCB_IS_FATX_ENTRY)
 537     {
 538         memset(FCB->entry.FatX.Filename, ' ', 42);
 539         FCB->entry.FatX.FileSize = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
 540         FCB->entry.FatX.Attrib = FILE_ATTRIBUTE_DIRECTORY;
 541         FCB->entry.FatX.FirstCluster = 1;
 542         Size = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
 543     }
 544     else
 545     {
 546         memset(FCB->entry.Fat.ShortName, ' ', 11);
 547         FCB->entry.Fat.FileSize = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
 548         FCB->entry.Fat.Attrib = FILE_ATTRIBUTE_DIRECTORY;
 549         if (pVCB->FatInfo.FatType == FAT32)
 550         {
 551             CurrentCluster = FirstCluster = pVCB->FatInfo.RootCluster;
 552             FCB->entry.Fat.FirstCluster = (unsigned short)(FirstCluster & 0xffff);
 553             FCB->entry.Fat.FirstClusterHigh = (unsigned short)(FirstCluster >> 16);
 554
 555             while (CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
 556             {
 557                 Size += pVCB->FatInfo.BytesPerCluster;
 558                 Status = NextCluster (pVCB, FirstCluster, &CurrentCluster, FALSE);
 559             }
 560         }
 561         else
 562         {
 563             FCB->entry.Fat.FirstCluster = 1;
 564             Size = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
 565         }
 566     }
 567     FCB->ShortHash.Hash = FCB->Hash.Hash;
 568     FCB->RefCount = 2;
 569     FCB->dirIndex = 0;
 570     FCB->RFCB.FileSize.QuadPart = Size;
 571     FCB->RFCB.ValidDataLength.QuadPart = Size;
 572     FCB->RFCB.AllocationSize.QuadPart = Size;
 573     FCB->RFCB.IsFastIoPossible = FastIoIsNotPossible;
 574
 575     vfatFCBInitializeCacheFromVolume(pVCB, FCB);
 576     vfatAddFCBToTable(pVCB, FCB);
 577
 578     return FCB;
 579 }
 580
 581 PVFATFCB
 582 vfatOpenRootFCB(
 583     PDEVICE_EXTENSION pVCB)
 584 {
 585     PVFATFCB FCB;
 586     UNICODE_STRING NameU = RTL_CONSTANT_STRING(L"\\");
 587
 588     FCB = vfatGrabFCBFromTable(pVCB, &NameU);
 589     if (FCB == NULL)
 590     {
 591         FCB = vfatMakeRootFCB(pVCB);
 592     }
 593
 594     return FCB;
 595 }
 596
 597 NTSTATUS
 598 vfatMakeFCBFromDirEntry(
 599     PVCB vcb,
 600     PVFATFCB directoryFCB,
 601     PVFAT_DIRENTRY_CONTEXT DirContext,
 602     PVFATFCB *fileFCB)
 603 {
 604     PVFATFCB rcFCB;
 605     ULONG Size;
 606     UNICODE_STRING NameU;
 607     NTSTATUS Status;
 608
 609     Status = vfatMakeFullName(directoryFCB, &DirContext->LongNameU, &DirContext->ShortNameU, &NameU);
 610     if (!NT_SUCCESS(Status))
 611     {
 612         return Status;
 613     }
 614
 615     rcFCB = vfatNewFCB(vcb, &NameU);
 616     RtlCopyMemory(&rcFCB->entry, &DirContext->DirEntry, sizeof (DIR_ENTRY));
 617     RtlCopyUnicodeString(&rcFCB->ShortNameU, &DirContext->ShortNameU);
 618     if (vcb->Flags & VCB_IS_FATX)
 619     {
 620         rcFCB->ShortHash.Hash = rcFCB->Hash.Hash;
 621     }
 622     else
 623     {
 624         rcFCB->ShortHash.Hash = vfatNameHash(0, &rcFCB->DirNameU);
 625         rcFCB->ShortHash.Hash = vfatNameHash(rcFCB->ShortHash.Hash, &rcFCB->ShortNameU);
 626     }
 627
 628     if (vfatFCBIsDirectory(rcFCB))
 629     {
 630         ULONG FirstCluster, CurrentCluster;
 631         NTSTATUS Status = STATUS_SUCCESS;
 632         Size = 0;
 633         FirstCluster = vfatDirEntryGetFirstCluster(vcb, &rcFCB->entry);
 634         if (FirstCluster == 1)
 635         {
 636             Size = vcb->FatInfo.rootDirectorySectors * vcb->FatInfo.BytesPerSector;
 637         }
 638         else if (FirstCluster != 0)
 639         {
 640             CurrentCluster = FirstCluster;
 641             while (CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
 642             {
 643                 Size += vcb->FatInfo.BytesPerCluster;
 644                 Status = NextCluster(vcb, FirstCluster, &CurrentCluster, FALSE);
 645             }
 646         }
 647     }
 648     else if (rcFCB->Flags & FCB_IS_FATX_ENTRY)
 649     {
 650         Size = rcFCB->entry.FatX.FileSize;
 651     }
 652     else
 653     {
 654         Size = rcFCB->entry.Fat.FileSize;
 655     }
 656     rcFCB->dirIndex = DirContext->DirIndex;
 657     rcFCB->startIndex = DirContext->StartIndex;
 658     if ((rcFCB->Flags & FCB_IS_FATX_ENTRY) && !vfatFCBIsRoot(directoryFCB))
 659     {
 660         ASSERT(DirContext->DirIndex >= 2 && DirContext->StartIndex >= 2);
 661         rcFCB->dirIndex = DirContext->DirIndex-2;
 662         rcFCB->startIndex = DirContext->StartIndex-2;
 663     }
 664     rcFCB->RFCB.FileSize.QuadPart = Size;
 665     rcFCB->RFCB.ValidDataLength.QuadPart = Size;
 666     rcFCB->RFCB.AllocationSize.QuadPart = ROUND_UP(Size, vcb->FatInfo.BytesPerCluster);
 667     rcFCB->RefCount = 1;
 668     if (vfatFCBIsDirectory(rcFCB))
 669     {
 670         vfatFCBInitializeCacheFromVolume(vcb, rcFCB);
 671     }
 672     rcFCB->parentFcb = directoryFCB;
 673     vfatAddFCBToTable(vcb, rcFCB);
 674     *fileFCB = rcFCB;
 675
 676     ExFreePool(NameU.Buffer);
 677     return STATUS_SUCCESS;
 678 }
 679
 680 NTSTATUS
 681 vfatAttachFCBToFileObject(
 682     PDEVICE_EXTENSION vcb,
 683     PVFATFCB fcb,
 684     PFILE_OBJECT fileObject)
 685 {
 686     PVFATCCB newCCB;
 687
 688     UNREFERENCED_PARAMETER(vcb);
 689
 690     newCCB = ExAllocateFromNPagedLookasideList(&VfatGlobalData->CcbLookasideList);
 691     if (newCCB == NULL)
 692     {
 693         return  STATUS_INSUFFICIENT_RESOURCES;
 694     }
 695     RtlZeroMemory(newCCB, sizeof (VFATCCB));
 696
 697     fileObject->SectionObjectPointer = &fcb->SectionObjectPointers;
 698     fileObject->FsContext = fcb;
 699     fileObject->FsContext2 = newCCB;
 700     DPRINT("file open: fcb:%p PathName:%wZ\n", fcb, &fcb->PathNameU);
 701
 702     return STATUS_SUCCESS;
 703 }
 704
 705 NTSTATUS
 706 vfatDirFindFile(
 707     PDEVICE_EXTENSION pDeviceExt,
 708     PVFATFCB pDirectoryFCB,
 709     PUNICODE_STRING FileToFindU,
 710     PVFATFCB *pFoundFCB)
 711 {
 712     NTSTATUS status;
 713     PVOID Context = NULL;
 714     PVOID Page = NULL;
 715     BOOLEAN First = TRUE;
 716     VFAT_DIRENTRY_CONTEXT DirContext;
 717     /* This buffer must have a size of 260 characters, because
 718     vfatMakeFCBFromDirEntry can copy 20 name entries with 13 characters. */
 719     WCHAR LongNameBuffer[260];
 720     WCHAR ShortNameBuffer[13];
 721     BOOLEAN FoundLong = FALSE;
 722     BOOLEAN FoundShort = FALSE;
 723
 724     ASSERT(pDeviceExt);
 725     ASSERT(pDirectoryFCB);
 726     ASSERT(FileToFindU);
 727
 728     DPRINT("vfatDirFindFile(VCB:%p, dirFCB:%p, File:%wZ)\n",
 729            pDeviceExt, pDirectoryFCB, FileToFindU);
 730     DPRINT("Dir Path:%wZ\n", &pDirectoryFCB->PathNameU);
 731
 732     DirContext.DirIndex = 0;
 733     DirContext.LongNameU.Buffer = LongNameBuffer;
 734     DirContext.LongNameU.Length = 0;
 735     DirContext.LongNameU.MaximumLength = sizeof(LongNameBuffer);
 736     DirContext.ShortNameU.Buffer = ShortNameBuffer;
 737     DirContext.ShortNameU.Length = 0;
 738     DirContext.ShortNameU.MaximumLength = sizeof(ShortNameBuffer);
 739
 740     while (TRUE)
 741     {
 742         status = pDeviceExt->GetNextDirEntry(&Context,
 743             &Page,
 744             pDirectoryFCB,
 745             &DirContext,
 746             First);
 747         First = FALSE;
 748         if (status == STATUS_NO_MORE_ENTRIES)
 749         {
 750             return STATUS_OBJECT_NAME_NOT_FOUND;
 751         }
 752         if (!NT_SUCCESS(status))
 753         {
 754             return status;
 755         }
 756
 757         DPRINT("  Index:%u  longName:%wZ\n",
 758                DirContext.DirIndex, &DirContext.LongNameU);
 759
 760         if (!ENTRY_VOLUME(pDeviceExt, &DirContext.DirEntry))
 761         {
 762             FoundLong = RtlEqualUnicodeString(FileToFindU, &DirContext.LongNameU, TRUE);
 763             if (FoundLong == FALSE)
 764             {
 765                 FoundShort = RtlEqualUnicodeString(FileToFindU, &DirContext.ShortNameU, TRUE);
 766             }
 767             if (FoundLong || FoundShort)
 768             {
 769                 status = vfatMakeFCBFromDirEntry(pDeviceExt,
 770                     pDirectoryFCB,
 771                     &DirContext,
 772                     pFoundFCB);
 773                 CcUnpinData(Context);
 774                 return status;
 775             }
 776         }
 777         DirContext.DirIndex++;
 778     }
 779
 780     return STATUS_OBJECT_NAME_NOT_FOUND;
 781 }
 782
 783 NTSTATUS
 784 vfatGetFCBForFile(
 785     PDEVICE_EXTENSION pVCB,
 786     PVFATFCB *pParentFCB,
 787     PVFATFCB *pFCB,
 788     PUNICODE_STRING pFileNameU)
 789 {
 790     NTSTATUS status;
 791     PVFATFCB FCB = NULL;
 792     PVFATFCB parentFCB;
 793     UNICODE_STRING NameU;
 794     UNICODE_STRING RootNameU = RTL_CONSTANT_STRING(L"\\");
 795     UNICODE_STRING FileNameU;
 796     WCHAR NameBuffer[260];
 797     PWCHAR curr, prev, last;
 798     ULONG Length;
 799
 800     DPRINT("vfatGetFCBForFile (%p,%p,%p,%wZ)\n",
 801            pVCB, pParentFCB, pFCB, pFileNameU);
 802
 803     FileNameU.Buffer = NameBuffer;
 804     FileNameU.MaximumLength = sizeof(NameBuffer);
 805     RtlCopyUnicodeString(&FileNameU, pFileNameU);
 806
 807     parentFCB = *pParentFCB;
 808
 809     if (parentFCB == NULL)
 810     {
 811         //  Trivial case, open of the root directory on volume
 812         if (RtlEqualUnicodeString(&FileNameU, &RootNameU, FALSE))
 813         {
 814             DPRINT("returning root FCB\n");
 815
 816             FCB = vfatOpenRootFCB(pVCB);
 817             *pFCB = FCB;
 818             *pParentFCB = NULL;
 819
 820             return (FCB != NULL) ? STATUS_SUCCESS : STATUS_OBJECT_PATH_NOT_FOUND;
 821         }
 822
 823         /* Check for an existing FCB */
 824         FCB = vfatGrabFCBFromTable(pVCB, &FileNameU);
 825         if (FCB)
 826         {
 827             *pFCB = FCB;
 828             *pParentFCB = FCB->parentFcb;
 829             vfatGrabFCB(pVCB, *pParentFCB);
 830             return STATUS_SUCCESS;
 831         }
 832
 833         last = curr = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
 834         while (*curr != L'\\' && curr > FileNameU.Buffer)
 835         {
 836             curr--;
 837         }
 838
 839         if (curr > FileNameU.Buffer)
 840         {
 841             NameU.Buffer = FileNameU.Buffer;
 842             NameU.MaximumLength = NameU.Length = (curr - FileNameU.Buffer) * sizeof(WCHAR);
 843             FCB = vfatGrabFCBFromTable(pVCB, &NameU);
 844             if (FCB)
 845             {
 846                 Length = (curr - FileNameU.Buffer) * sizeof(WCHAR);
 847                 if (Length != FCB->PathNameU.Length)
 848                 {
 849                     if (FileNameU.Length + FCB->PathNameU.Length - Length > FileNameU.MaximumLength)
 850                     {
 851                         vfatReleaseFCB(pVCB, FCB);
 852                         return STATUS_OBJECT_NAME_INVALID;
 853                     }
 854                     RtlMoveMemory(FileNameU.Buffer + FCB->PathNameU.Length / sizeof(WCHAR),
 855                         curr, FileNameU.Length - Length);
 856                     FileNameU.Length += (USHORT)(FCB->PathNameU.Length - Length);
 857                     curr = FileNameU.Buffer + FCB->PathNameU.Length / sizeof(WCHAR);
 858                     last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
 859                 }
 860                 RtlCopyMemory(FileNameU.Buffer, FCB->PathNameU.Buffer, FCB->PathNameU.Length);
 861             }
 862         }
 863         else
 864         {
 865             FCB = NULL;
 866         }
 867
 868         if (FCB == NULL)
 869         {
 870             FCB = vfatOpenRootFCB(pVCB);
 871             curr = FileNameU.Buffer;
 872         }
 873
 874         parentFCB = NULL;
 875         prev = curr;
 876     }
 877     else
 878     {
 879         FCB = parentFCB;
 880         parentFCB = NULL;
 881         prev = curr = FileNameU.Buffer - 1;
 882         last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
 883     }
 884
 885     while (curr <= last)
 886     {
 887         if (parentFCB)
 888         {
 889             vfatReleaseFCB(pVCB, parentFCB);
 890             parentFCB = NULL;
 891         }
 892         //  fail if element in FCB is not a directory
 893         if (!vfatFCBIsDirectory(FCB))
 894         {
 895             DPRINT ("Element in requested path is not a directory\n");
 896
 897             vfatReleaseFCB(pVCB, FCB);
 898             FCB = NULL;
 899             *pParentFCB = NULL;
 900             *pFCB = NULL;
 901
 902             return  STATUS_OBJECT_PATH_NOT_FOUND;
 903         }
 904         parentFCB = FCB;
 905         if (prev < curr)
 906         {
 907             Length = (curr - prev) * sizeof(WCHAR);
 908             if (Length != parentFCB->LongNameU.Length)
 909             {
 910                 if (FileNameU.Length + parentFCB->LongNameU.Length - Length > FileNameU.MaximumLength)
 911                 {
 912                     vfatReleaseFCB(pVCB, parentFCB);
 913                     *pParentFCB = NULL;
 914                     *pFCB = NULL;
 915                     return STATUS_OBJECT_NAME_INVALID;
 916                 }
 917                 RtlMoveMemory(prev + parentFCB->LongNameU.Length / sizeof(WCHAR), curr,
 918                     FileNameU.Length - (curr - FileNameU.Buffer) * sizeof(WCHAR));
 919                 FileNameU.Length += (USHORT)(parentFCB->LongNameU.Length - Length);
 920                 curr = prev + parentFCB->LongNameU.Length / sizeof(WCHAR);
 921                 last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
 922             }
 923             RtlCopyMemory(prev, parentFCB->LongNameU.Buffer, parentFCB->LongNameU.Length);
 924         }
 925         curr++;
 926         prev = curr;
 927         while (*curr != L'\\' && curr <= last)
 928         {
 929             curr++;
 930         }
 931         NameU.Buffer = FileNameU.Buffer;
 932         NameU.Length = (curr - NameU.Buffer) * sizeof(WCHAR);
 933         NameU.MaximumLength = FileNameU.MaximumLength;
 934         DPRINT("%wZ\n", &NameU);
 935         FCB = vfatGrabFCBFromTable(pVCB, &NameU);
 936         if (FCB == NULL)
 937         {
 938             NameU.Buffer = prev;
 939             NameU.MaximumLength = NameU.Length = (curr - prev) * sizeof(WCHAR);
 940             status = vfatDirFindFile(pVCB, parentFCB, &NameU, &FCB);
 941             if (status == STATUS_OBJECT_NAME_NOT_FOUND)
 942             {
 943                 *pFCB = NULL;
 944                 if (curr > last)
 945                 {
 946                     *pParentFCB = parentFCB;
 947                     return STATUS_OBJECT_NAME_NOT_FOUND;
 948                 }
 949                 else
 950                 {
 951                     vfatReleaseFCB(pVCB, parentFCB);
 952                     *pParentFCB = NULL;
 953                     return STATUS_OBJECT_PATH_NOT_FOUND;
 954                 }
 955             }
 956             else if (!NT_SUCCESS(status))
 957             {
 958                 vfatReleaseFCB(pVCB, parentFCB);
 959                 *pParentFCB = NULL;
 960                 *pFCB = NULL;
 961
 962                 return status;
 963             }
 964         }
 965     }
 966
 967     *pParentFCB = parentFCB;
 968     *pFCB = FCB;
 969
 970     return STATUS_SUCCESS;
 971 }