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