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->RFCB.NodeTypeCode = NODE_TYPE_FCB;
 102     Fcb->RFCB.NodeByteSize = sizeof(VFATFCB);
 103
 104     Fcb->PathNameU.Length = 0;
 105     Fcb->PathNameU.Buffer = Fcb->PathNameBuffer;
 106     Fcb->PathNameU.MaximumLength = PathNameBufferLength;
 107     Fcb->ShortNameU.Length = 0;
 108     Fcb->ShortNameU.Buffer = Fcb->ShortNameBuffer;
 109     Fcb->ShortNameU.MaximumLength = sizeof(Fcb->ShortNameBuffer);
 110     Fcb->DirNameU.Buffer = Fcb->PathNameU.Buffer;
 111     if (NameU && NameU->Length)
 112     {
 113         RtlCopyUnicodeString(&Fcb->PathNameU, NameU);
 114         vfatSplitPathName(&Fcb->PathNameU, &Fcb->DirNameU, &Fcb->LongNameU);
 115     }
 116     else
 117     {
 118         Fcb->DirNameU.Buffer = Fcb->LongNameU.Buffer = NULL;
 119         Fcb->DirNameU.MaximumLength = Fcb->DirNameU.Length = 0;
 120         Fcb->LongNameU.MaximumLength = Fcb->LongNameU.Length = 0;
 121     }
 122     RtlZeroMemory(&Fcb->FCBShareAccess, sizeof(SHARE_ACCESS));
 123     Fcb->OpenHandleCount = 0;
 124 }
 125
 126 PVFATFCB
 127 vfatNewFCB(
 128     PDEVICE_EXTENSION pVCB,
 129     PUNICODE_STRING pFileNameU)
 130 {
 131     PVFATFCB  rcFCB;
 132
 133     DPRINT("'%wZ'\n", pFileNameU);
 134
 135     rcFCB = ExAllocateFromNPagedLookasideList(&VfatGlobalData->FcbLookasideList);
 136     if (rcFCB == NULL)
 137     {
 138         return NULL;
 139     }
 140     RtlZeroMemory(rcFCB, sizeof(VFATFCB));
 141     vfatInitFcb(rcFCB, pFileNameU);
 142     if (vfatVolumeIsFatX(pVCB))
 143         rcFCB->Attributes = &rcFCB->entry.FatX.Attrib;
 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     InitializeListHead(&rcFCB->ParentListHead);
 157
 158     return  rcFCB;
 159 }
 160
 161 static
 162 VOID
 163 vfatDelFCBFromTable(
 164     PDEVICE_EXTENSION pVCB,
 165     PVFATFCB pFCB)
 166 {
 167     ULONG Index;
 168     ULONG ShortIndex;
 169     HASHENTRY* entry;
 170
 171     Index = pFCB->Hash.Hash % pVCB->HashTableSize;
 172     ShortIndex = pFCB->ShortHash.Hash % pVCB->HashTableSize;
 173
 174     if (pFCB->Hash.Hash != pFCB->ShortHash.Hash)
 175     {
 176         entry = pVCB->FcbHashTable[ShortIndex];
 177         if (entry->self == pFCB)
 178         {
 179             pVCB->FcbHashTable[ShortIndex] = entry->next;
 180         }
 181         else
 182         {
 183             while (entry->next->self != pFCB)
 184             {
 185                 entry = entry->next;
 186             }
 187             entry->next = pFCB->ShortHash.next;
 188         }
 189     }
 190     entry = pVCB->FcbHashTable[Index];
 191     if (entry->self == pFCB)
 192     {
 193         pVCB->FcbHashTable[Index] = entry->next;
 194     }
 195     else
 196     {
 197         while (entry->next->self != pFCB)
 198         {
 199             entry = entry->next;
 200         }
 201         entry->next = pFCB->Hash.next;
 202     }
 203
 204     RemoveEntryList(&pFCB->FcbListEntry);
 205 }
 206
 207 static
 208 NTSTATUS
 209 vfatMakeFullName(
 210     PVFATFCB directoryFCB,
 211     PUNICODE_STRING LongNameU,
 212     PUNICODE_STRING ShortNameU,
 213     PUNICODE_STRING NameU)
 214 {
 215     PWCHAR PathNameBuffer;
 216     USHORT PathNameLength;
 217
 218     PathNameLength = directoryFCB->PathNameU.Length + max(LongNameU->Length, ShortNameU->Length);
 219     if (!vfatFCBIsRoot(directoryFCB))
 220     {
 221         PathNameLength += sizeof(WCHAR);
 222     }
 223
 224     if (PathNameLength > LONGNAME_MAX_LENGTH * sizeof(WCHAR))
 225     {
 226         return  STATUS_OBJECT_NAME_INVALID;
 227     }
 228     PathNameBuffer = ExAllocatePoolWithTag(NonPagedPool, PathNameLength + sizeof(WCHAR), TAG_FCB);
 229     if (!PathNameBuffer)
 230     {
 231         return STATUS_INSUFFICIENT_RESOURCES;
 232     }
 233     NameU->Buffer = PathNameBuffer;
 234     NameU->Length = 0;
 235     NameU->MaximumLength = PathNameLength;
 236
 237     RtlCopyUnicodeString(NameU, &directoryFCB->PathNameU);
 238     if (!vfatFCBIsRoot(directoryFCB))
 239     {
 240         RtlAppendUnicodeToString(NameU, L"\\");
 241     }
 242     if (LongNameU->Length > 0)
 243     {
 244         RtlAppendUnicodeStringToString(NameU, LongNameU);
 245     }
 246     else
 247     {
 248         RtlAppendUnicodeStringToString(NameU, ShortNameU);
 249     }
 250     NameU->Buffer[NameU->Length / sizeof(WCHAR)] = 0;
 251
 252     return STATUS_SUCCESS;
 253 }
 254
 255 VOID
 256 vfatDestroyCCB(
 257     PVFATCCB pCcb)
 258 {
 259     if (pCcb->SearchPattern.Buffer)
 260     {
 261         ExFreePoolWithTag(pCcb->SearchPattern.Buffer, TAG_VFAT);
 262     }
 263     ExFreeToNPagedLookasideList(&VfatGlobalData->CcbLookasideList, pCcb);
 264 }
 265
 266 VOID
 267 vfatDestroyFCB(
 268     PVFATFCB pFCB)
 269 {
 270     FsRtlUninitializeFileLock(&pFCB->FileLock);
 271     if (!vfatFCBIsRoot(pFCB) &&
 272         !BooleanFlagOn(pFCB->Flags, FCB_IS_FAT) && !BooleanFlagOn(pFCB->Flags, FCB_IS_VOLUME))
 273     {
 274         RemoveEntryList(&pFCB->ParentListEntry);
 275     }
 276     ExFreePool(pFCB->PathNameBuffer);
 277     ExDeleteResourceLite(&pFCB->PagingIoResource);
 278     ExDeleteResourceLite(&pFCB->MainResource);
 279     ASSERT(IsListEmpty(&pFCB->ParentListHead));
 280     ExFreeToNPagedLookasideList(&VfatGlobalData->FcbLookasideList, pFCB);
 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     ASSERT(pFCB->Hash.Hash == vfatNameHash(0, &pFCB->PathNameU));
 344     Index = pFCB->Hash.Hash % pVCB->HashTableSize;
 345     ShortIndex = pFCB->ShortHash.Hash % pVCB->HashTableSize;
 346
 347     InsertTailList(&pVCB->FcbListHead, &pFCB->FcbListEntry);
 348
 349     pFCB->Hash.next = pVCB->FcbHashTable[Index];
 350     pVCB->FcbHashTable[Index] = &pFCB->Hash;
 351     if (pFCB->Hash.Hash != pFCB->ShortHash.Hash)
 352     {
 353         pFCB->ShortHash.next = pVCB->FcbHashTable[ShortIndex];
 354         pVCB->FcbHashTable[ShortIndex] = &pFCB->ShortHash;
 355     }
 356     if (pFCB->parentFcb)
 357     {
 358         vfatGrabFCB(pVCB, pFCB->parentFcb);
 359     }
 360 }
 361
 362 static
 363 VOID
 364 vfatInitFCBFromDirEntry(
 365     PDEVICE_EXTENSION Vcb,
 366     PVFATFCB Fcb,
 367     PVFAT_DIRENTRY_CONTEXT DirContext)
 368 {
 369     ULONG Size;
 370
 371     RtlCopyMemory(&Fcb->entry, &DirContext->DirEntry, sizeof (DIR_ENTRY));
 372     RtlCopyUnicodeString(&Fcb->ShortNameU, &DirContext->ShortNameU);
 373     Fcb->Hash.Hash = vfatNameHash(0, &Fcb->PathNameU);
 374     if (vfatVolumeIsFatX(Vcb))
 375     {
 376         Fcb->ShortHash.Hash = Fcb->Hash.Hash;
 377     }
 378     else
 379     {
 380         Fcb->ShortHash.Hash = vfatNameHash(0, &Fcb->DirNameU);
 381         Fcb->ShortHash.Hash = vfatNameHash(Fcb->ShortHash.Hash, &Fcb->ShortNameU);
 382     }
 383
 384     if (vfatFCBIsDirectory(Fcb))
 385     {
 386         ULONG FirstCluster, CurrentCluster;
 387         NTSTATUS Status = STATUS_SUCCESS;
 388         Size = 0;
 389         FirstCluster = vfatDirEntryGetFirstCluster(Vcb, &Fcb->entry);
 390         if (FirstCluster == 1)
 391         {
 392             Size = Vcb->FatInfo.rootDirectorySectors * Vcb->FatInfo.BytesPerSector;
 393         }
 394         else if (FirstCluster != 0)
 395         {
 396             CurrentCluster = FirstCluster;
 397             while (CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
 398             {
 399                 Size += Vcb->FatInfo.BytesPerCluster;
 400                 Status = NextCluster(Vcb, FirstCluster, &CurrentCluster, FALSE);
 401             }
 402         }
 403     }
 404     else if (vfatVolumeIsFatX(Vcb))
 405     {
 406         Size = Fcb->entry.FatX.FileSize;
 407     }
 408     else
 409     {
 410         Size = Fcb->entry.Fat.FileSize;
 411     }
 412     Fcb->dirIndex = DirContext->DirIndex;
 413     Fcb->startIndex = DirContext->StartIndex;
 414     if (vfatVolumeIsFatX(Vcb) && !vfatFCBIsRoot(Fcb))
 415     {
 416         ASSERT(DirContext->DirIndex >= 2 && DirContext->StartIndex >= 2);
 417         Fcb->dirIndex = DirContext->DirIndex-2;
 418         Fcb->startIndex = DirContext->StartIndex-2;
 419     }
 420     Fcb->RFCB.FileSize.QuadPart = Size;
 421     Fcb->RFCB.ValidDataLength.QuadPart = Size;
 422     Fcb->RFCB.AllocationSize.QuadPart = ROUND_UP_64(Size, Vcb->FatInfo.BytesPerCluster);
 423 }
 424
 425 NTSTATUS
 426 vfatSetFCBNewDirName(
 427     PDEVICE_EXTENSION pVCB,
 428     PVFATFCB Fcb,
 429     PVFATFCB ParentFcb)
 430 {
 431     NTSTATUS Status;
 432     UNICODE_STRING NewNameU;
 433
 434     /* Get full path name */
 435     Status = vfatMakeFullName(ParentFcb, &Fcb->LongNameU, &Fcb->ShortNameU, &NewNameU);
 436     if (!NT_SUCCESS(Status))
 437     {
 438         return Status;
 439     }
 440
 441     /* Delete old name */
 442     if (Fcb->PathNameBuffer)
 443     {
 444         ExFreePoolWithTag(Fcb->PathNameBuffer, TAG_FCB);
 445     }
 446     Fcb->PathNameU = NewNameU;
 447
 448     /* Delete from table */
 449     vfatDelFCBFromTable(pVCB, Fcb);
 450
 451     /* Split it properly */
 452     Fcb->PathNameBuffer = Fcb->PathNameU.Buffer;
 453     Fcb->DirNameU.Buffer = Fcb->PathNameU.Buffer;
 454     vfatSplitPathName(&Fcb->PathNameU, &Fcb->DirNameU, &Fcb->LongNameU);
 455     Fcb->Hash.Hash = vfatNameHash(0, &Fcb->PathNameU);
 456     if (vfatVolumeIsFatX(pVCB))
 457     {
 458         Fcb->ShortHash.Hash = Fcb->Hash.Hash;
 459     }
 460     else
 461     {
 462         Fcb->ShortHash.Hash = vfatNameHash(0, &Fcb->DirNameU);
 463         Fcb->ShortHash.Hash = vfatNameHash(Fcb->ShortHash.Hash, &Fcb->ShortNameU);
 464     }
 465
 466     vfatAddFCBToTable(pVCB, Fcb);
 467     vfatReleaseFCB(pVCB, ParentFcb);
 468
 469     return STATUS_SUCCESS;
 470 }
 471
 472 NTSTATUS
 473 vfatUpdateFCB(
 474     PDEVICE_EXTENSION pVCB,
 475     PVFATFCB Fcb,
 476     PVFAT_DIRENTRY_CONTEXT DirContext,
 477     PVFATFCB ParentFcb)
 478 {
 479     NTSTATUS Status;
 480     PVFATFCB OldParent;
 481
 482     DPRINT("vfatUpdateFCB(%p, %p, %p, %p)\n", pVCB, Fcb, DirContext, ParentFcb);
 483
 484     /* Get full path name */
 485     Status = vfatMakeFullName(ParentFcb, &DirContext->LongNameU, &DirContext->ShortNameU, &Fcb->PathNameU);
 486     if (!NT_SUCCESS(Status))
 487     {
 488         return Status;
 489     }
 490
 491     /* Delete old name */
 492     if (Fcb->PathNameBuffer)
 493     {
 494         ExFreePoolWithTag(Fcb->PathNameBuffer, TAG_FCB);
 495     }
 496
 497     /* Delete from table */
 498     vfatDelFCBFromTable(pVCB, Fcb);
 499
 500     /* Split it properly */
 501     Fcb->PathNameBuffer = Fcb->PathNameU.Buffer;
 502     Fcb->DirNameU.Buffer = Fcb->PathNameU.Buffer;
 503     vfatSplitPathName(&Fcb->PathNameU, &Fcb->DirNameU, &Fcb->LongNameU);
 504
 505     /* Save old parent */
 506     OldParent = Fcb->parentFcb;
 507     RemoveEntryList(&Fcb->ParentListEntry);
 508
 509     /* Reinit FCB */
 510     vfatInitFCBFromDirEntry(pVCB, Fcb, DirContext);
 511
 512     if (vfatFCBIsDirectory(Fcb))
 513     {
 514         CcFlushCache(&Fcb->SectionObjectPointers, NULL, 0, NULL);
 515     }
 516     Fcb->parentFcb = ParentFcb;
 517     InsertTailList(&ParentFcb->ParentListHead, &Fcb->ParentListEntry);
 518     vfatAddFCBToTable(pVCB, Fcb);
 519
 520     /* If we moved across directories, dereference our old parent
 521      * We also dereference in case we're just renaming since AddFCBToTable references it
 522      */
 523     vfatReleaseFCB(pVCB, OldParent);
 524
 525     return STATUS_SUCCESS;
 526 }
 527
 528 PVFATFCB
 529 vfatGrabFCBFromTable(
 530     PDEVICE_EXTENSION pVCB,
 531     PUNICODE_STRING PathNameU)
 532 {
 533     PVFATFCB  rcFCB;
 534     ULONG Hash;
 535     UNICODE_STRING DirNameU;
 536     UNICODE_STRING FileNameU;
 537     PUNICODE_STRING FcbNameU;
 538
 539     HASHENTRY* entry;
 540
 541     DPRINT("'%wZ'\n", PathNameU);
 542
 543     ASSERT(PathNameU->Length >= sizeof(WCHAR) && PathNameU->Buffer[0] == L'\\');
 544     Hash = vfatNameHash(0, PathNameU);
 545
 546     entry = pVCB->FcbHashTable[Hash % pVCB->HashTableSize];
 547     if (entry)
 548     {
 549         vfatSplitPathName(PathNameU, &DirNameU, &FileNameU);
 550     }
 551
 552     while (entry)
 553     {
 554         if (entry->Hash == Hash)
 555         {
 556             rcFCB = entry->self;
 557             DPRINT("'%wZ' '%wZ'\n", &DirNameU, &rcFCB->DirNameU);
 558             if (RtlEqualUnicodeString(&DirNameU, &rcFCB->DirNameU, TRUE))
 559             {
 560                 if (rcFCB->Hash.Hash == Hash)
 561                 {
 562                     FcbNameU = &rcFCB->LongNameU;
 563                 }
 564                 else
 565                 {
 566                     FcbNameU = &rcFCB->ShortNameU;
 567                 }
 568                 /* compare the file name */
 569                 DPRINT("'%wZ' '%wZ'\n", &FileNameU, FcbNameU);
 570                 if (RtlEqualUnicodeString(&FileNameU, FcbNameU, TRUE))
 571                 {
 572                     vfatGrabFCB(pVCB, rcFCB);
 573                     return rcFCB;
 574                 }
 575             }
 576         }
 577         entry = entry->next;
 578     }
 579     return NULL;
 580 }
 581
 582 static
 583 NTSTATUS
 584 vfatFCBInitializeCacheFromVolume(
 585     PVCB vcb,
 586     PVFATFCB fcb)
 587 {
 588     PFILE_OBJECT fileObject;
 589     PVFATCCB newCCB;
 590     NTSTATUS status;
 591
 592     fileObject = IoCreateStreamFileObject (NULL, vcb->StorageDevice);
 593
 594     newCCB = ExAllocateFromNPagedLookasideList(&VfatGlobalData->CcbLookasideList);
 595     if (newCCB == NULL)
 596     {
 597         ObDereferenceObject(fileObject);
 598         return STATUS_INSUFFICIENT_RESOURCES;
 599     }
 600     RtlZeroMemory(newCCB, sizeof (VFATCCB));
 601
 602     fileObject->SectionObjectPointer = &fcb->SectionObjectPointers;
 603     fileObject->FsContext = fcb;
 604     fileObject->FsContext2 = newCCB;
 605     fcb->FileObject = fileObject;
 606
 607     _SEH2_TRY
 608     {
 609         CcInitializeCacheMap(fileObject,
 610                              (PCC_FILE_SIZES)(&fcb->RFCB.AllocationSize),
 611                              TRUE,
 612                              &VfatGlobalData->CacheMgrCallbacks,
 613                              fcb);
 614     }
 615     _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 616     {
 617         status = _SEH2_GetExceptionCode();
 618         fcb->FileObject = NULL;
 619         ExFreeToNPagedLookasideList(&VfatGlobalData->CcbLookasideList, newCCB);
 620         ObDereferenceObject(fileObject);
 621         return status;
 622     }
 623     _SEH2_END;
 624
 625     vfatGrabFCB(vcb, fcb);
 626     fcb->Flags |= FCB_CACHE_INITIALIZED;
 627     return STATUS_SUCCESS;
 628 }
 629
 630 PVFATFCB
 631 vfatMakeRootFCB(
 632     PDEVICE_EXTENSION pVCB)
 633 {
 634     PVFATFCB FCB;
 635     ULONG FirstCluster, CurrentCluster, Size = 0;
 636     NTSTATUS Status = STATUS_SUCCESS;
 637     UNICODE_STRING NameU = RTL_CONSTANT_STRING(L"\\");
 638
 639     FCB = vfatNewFCB(pVCB, &NameU);
 640     if (vfatVolumeIsFatX(pVCB))
 641     {
 642         memset(FCB->entry.FatX.Filename, ' ', 42);
 643         FCB->entry.FatX.FileSize = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
 644         FCB->entry.FatX.Attrib = FILE_ATTRIBUTE_DIRECTORY;
 645         FCB->entry.FatX.FirstCluster = 1;
 646         Size = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
 647     }
 648     else
 649     {
 650         memset(FCB->entry.Fat.ShortName, ' ', 11);
 651         FCB->entry.Fat.FileSize = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
 652         FCB->entry.Fat.Attrib = FILE_ATTRIBUTE_DIRECTORY;
 653         if (pVCB->FatInfo.FatType == FAT32)
 654         {
 655             CurrentCluster = FirstCluster = pVCB->FatInfo.RootCluster;
 656             FCB->entry.Fat.FirstCluster = (unsigned short)(FirstCluster & 0xffff);
 657             FCB->entry.Fat.FirstClusterHigh = (unsigned short)(FirstCluster >> 16);
 658
 659             while (CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
 660             {
 661                 Size += pVCB->FatInfo.BytesPerCluster;
 662                 Status = NextCluster (pVCB, FirstCluster, &CurrentCluster, FALSE);
 663             }
 664         }
 665         else
 666         {
 667             FCB->entry.Fat.FirstCluster = 1;
 668             Size = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
 669         }
 670     }
 671     FCB->ShortHash.Hash = FCB->Hash.Hash;
 672     FCB->RefCount = 2;
 673     FCB->dirIndex = 0;
 674     FCB->RFCB.FileSize.QuadPart = Size;
 675     FCB->RFCB.ValidDataLength.QuadPart = Size;
 676     FCB->RFCB.AllocationSize.QuadPart = Size;
 677     FCB->RFCB.IsFastIoPossible = FastIoIsNotPossible;
 678
 679     vfatFCBInitializeCacheFromVolume(pVCB, FCB);
 680     vfatAddFCBToTable(pVCB, FCB);
 681
 682     return FCB;
 683 }
 684
 685 PVFATFCB
 686 vfatOpenRootFCB(
 687     PDEVICE_EXTENSION pVCB)
 688 {
 689     PVFATFCB FCB;
 690     UNICODE_STRING NameU = RTL_CONSTANT_STRING(L"\\");
 691
 692     FCB = vfatGrabFCBFromTable(pVCB, &NameU);
 693     if (FCB == NULL)
 694     {
 695         FCB = vfatMakeRootFCB(pVCB);
 696     }
 697
 698     return FCB;
 699 }
 700
 701 NTSTATUS
 702 vfatMakeFCBFromDirEntry(
 703     PVCB vcb,
 704     PVFATFCB directoryFCB,
 705     PVFAT_DIRENTRY_CONTEXT DirContext,
 706     PVFATFCB *fileFCB)
 707 {
 708     PVFATFCB rcFCB;
 709     UNICODE_STRING NameU;
 710     NTSTATUS Status;
 711
 712     Status = vfatMakeFullName(directoryFCB, &DirContext->LongNameU, &DirContext->ShortNameU, &NameU);
 713     if (!NT_SUCCESS(Status))
 714     {
 715         return Status;
 716     }
 717
 718     rcFCB = vfatNewFCB(vcb, &NameU);
 719     vfatInitFCBFromDirEntry(vcb, rcFCB, DirContext);
 720
 721     rcFCB->RefCount = 1;
 722     if (vfatFCBIsDirectory(rcFCB))
 723     {
 724         Status = vfatFCBInitializeCacheFromVolume(vcb, rcFCB);
 725         if (!NT_SUCCESS(Status))
 726         {
 727             vfatReleaseFCB(vcb, rcFCB);
 728             ExFreePoolWithTag(NameU.Buffer, TAG_FCB);
 729             return Status;
 730         }
 731     }
 732     rcFCB->parentFcb = directoryFCB;
 733     InsertTailList(&directoryFCB->ParentListHead, &rcFCB->ParentListEntry);
 734     vfatAddFCBToTable(vcb, rcFCB);
 735     *fileFCB = rcFCB;
 736
 737     ExFreePoolWithTag(NameU.Buffer, TAG_FCB);
 738     return STATUS_SUCCESS;
 739 }
 740
 741 NTSTATUS
 742 vfatAttachFCBToFileObject(
 743     PDEVICE_EXTENSION vcb,
 744     PVFATFCB fcb,
 745     PFILE_OBJECT fileObject)
 746 {
 747     PVFATCCB newCCB;
 748
 749     UNREFERENCED_PARAMETER(vcb);
 750
 751     newCCB = ExAllocateFromNPagedLookasideList(&VfatGlobalData->CcbLookasideList);
 752     if (newCCB == NULL)
 753     {
 754         return  STATUS_INSUFFICIENT_RESOURCES;
 755     }
 756     RtlZeroMemory(newCCB, sizeof (VFATCCB));
 757
 758     fileObject->SectionObjectPointer = &fcb->SectionObjectPointers;
 759     fileObject->FsContext = fcb;
 760     fileObject->FsContext2 = newCCB;
 761     DPRINT("file open: fcb:%p PathName:%wZ\n", fcb, &fcb->PathNameU);
 762
 763     return STATUS_SUCCESS;
 764 }
 765
 766 NTSTATUS
 767 vfatDirFindFile(
 768     PDEVICE_EXTENSION pDeviceExt,
 769     PVFATFCB pDirectoryFCB,
 770     PUNICODE_STRING FileToFindU,
 771     PVFATFCB *pFoundFCB)
 772 {
 773     NTSTATUS status;
 774     PVOID Context = NULL;
 775     PVOID Page = NULL;
 776     BOOLEAN First = TRUE;
 777     VFAT_DIRENTRY_CONTEXT DirContext;
 778     /* This buffer must have a size of 260 characters, because
 779     vfatMakeFCBFromDirEntry can copy 20 name entries with 13 characters. */
 780     WCHAR LongNameBuffer[260];
 781     WCHAR ShortNameBuffer[13];
 782     BOOLEAN FoundLong = FALSE;
 783     BOOLEAN FoundShort = FALSE;
 784     BOOLEAN IsFatX = vfatVolumeIsFatX(pDeviceExt);
 785
 786     ASSERT(pDeviceExt);
 787     ASSERT(pDirectoryFCB);
 788     ASSERT(FileToFindU);
 789
 790     DPRINT("vfatDirFindFile(VCB:%p, dirFCB:%p, File:%wZ)\n",
 791            pDeviceExt, pDirectoryFCB, FileToFindU);
 792     DPRINT("Dir Path:%wZ\n", &pDirectoryFCB->PathNameU);
 793
 794     DirContext.DirIndex = 0;
 795     DirContext.LongNameU.Buffer = LongNameBuffer;
 796     DirContext.LongNameU.Length = 0;
 797     DirContext.LongNameU.MaximumLength = sizeof(LongNameBuffer);
 798     DirContext.ShortNameU.Buffer = ShortNameBuffer;
 799     DirContext.ShortNameU.Length = 0;
 800     DirContext.ShortNameU.MaximumLength = sizeof(ShortNameBuffer);
 801
 802     while (TRUE)
 803     {
 804         status = VfatGetNextDirEntry(pDeviceExt,
 805             &Context,
 806             &Page,
 807             pDirectoryFCB,
 808             &DirContext,
 809             First);
 810         First = FALSE;
 811         if (status == STATUS_NO_MORE_ENTRIES)
 812         {
 813             return STATUS_OBJECT_NAME_NOT_FOUND;
 814         }
 815         if (!NT_SUCCESS(status))
 816         {
 817             return status;
 818         }
 819
 820         DPRINT("  Index:%u  longName:%wZ\n",
 821                DirContext.DirIndex, &DirContext.LongNameU);
 822
 823         if (!ENTRY_VOLUME(IsFatX, &DirContext.DirEntry))
 824         {
 825             if (DirContext.LongNameU.Length == 0 ||
 826                 DirContext.ShortNameU.Length == 0)
 827             {
 828                 DPRINT1("WARNING: File system corruption detected. You may need to run a disk repair utility.\n");
 829                 if (VfatGlobalData->Flags & VFAT_BREAK_ON_CORRUPTION)
 830                 {
 831                     ASSERT(DirContext.LongNameU.Length != 0 &&
 832                            DirContext.ShortNameU.Length != 0);
 833                 }
 834                 DirContext.DirIndex++;
 835                 continue;
 836             }
 837             FoundLong = RtlEqualUnicodeString(FileToFindU, &DirContext.LongNameU, TRUE);
 838             if (FoundLong == FALSE)
 839             {
 840                 FoundShort = RtlEqualUnicodeString(FileToFindU, &DirContext.ShortNameU, TRUE);
 841             }
 842             if (FoundLong || FoundShort)
 843             {
 844                 status = vfatMakeFCBFromDirEntry(pDeviceExt,
 845                     pDirectoryFCB,
 846                     &DirContext,
 847                     pFoundFCB);
 848                 CcUnpinData(Context);
 849                 return status;
 850             }
 851         }
 852         DirContext.DirIndex++;
 853     }
 854
 855     return STATUS_OBJECT_NAME_NOT_FOUND;
 856 }
 857
 858 NTSTATUS
 859 vfatGetFCBForFile(
 860     PDEVICE_EXTENSION pVCB,
 861     PVFATFCB *pParentFCB,
 862     PVFATFCB *pFCB,
 863     PUNICODE_STRING pFileNameU)
 864 {
 865     NTSTATUS status;
 866     PVFATFCB FCB = NULL;
 867     PVFATFCB parentFCB;
 868     UNICODE_STRING NameU;
 869     UNICODE_STRING RootNameU = RTL_CONSTANT_STRING(L"\\");
 870     UNICODE_STRING FileNameU;
 871     WCHAR NameBuffer[260];
 872     PWCHAR curr, prev, last;
 873     ULONG Length;
 874
 875     DPRINT("vfatGetFCBForFile (%p,%p,%p,%wZ)\n",
 876            pVCB, pParentFCB, pFCB, pFileNameU);
 877
 878     RtlInitEmptyUnicodeString(&FileNameU, NameBuffer, sizeof(NameBuffer));
 879
 880     parentFCB = *pParentFCB;
 881
 882     if (parentFCB == NULL)
 883     {
 884         /* Passed-in name is the full name */
 885         RtlCopyUnicodeString(&FileNameU, pFileNameU);
 886
 887         //  Trivial case, open of the root directory on volume
 888         if (RtlEqualUnicodeString(&FileNameU, &RootNameU, FALSE))
 889         {
 890             DPRINT("returning root FCB\n");
 891
 892             FCB = vfatOpenRootFCB(pVCB);
 893             *pFCB = FCB;
 894             *pParentFCB = NULL;
 895
 896             return (FCB != NULL) ? STATUS_SUCCESS : STATUS_OBJECT_PATH_NOT_FOUND;
 897         }
 898
 899         /* Check for an existing FCB */
 900         FCB = vfatGrabFCBFromTable(pVCB, &FileNameU);
 901         if (FCB)
 902         {
 903             *pFCB = FCB;
 904             *pParentFCB = FCB->parentFcb;
 905             vfatGrabFCB(pVCB, *pParentFCB);
 906             return STATUS_SUCCESS;
 907         }
 908
 909         last = curr = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
 910         while (*curr != L'\\' && curr > FileNameU.Buffer)
 911         {
 912             curr--;
 913         }
 914
 915         if (curr > FileNameU.Buffer)
 916         {
 917             NameU.Buffer = FileNameU.Buffer;
 918             NameU.MaximumLength = NameU.Length = (curr - FileNameU.Buffer) * sizeof(WCHAR);
 919             FCB = vfatGrabFCBFromTable(pVCB, &NameU);
 920             if (FCB)
 921             {
 922                 Length = (curr - FileNameU.Buffer) * sizeof(WCHAR);
 923                 if (Length != FCB->PathNameU.Length)
 924                 {
 925                     if (FileNameU.Length + FCB->PathNameU.Length - Length > FileNameU.MaximumLength)
 926                     {
 927                         vfatReleaseFCB(pVCB, FCB);
 928                         return STATUS_OBJECT_NAME_INVALID;
 929                     }
 930                     RtlMoveMemory(FileNameU.Buffer + FCB->PathNameU.Length / sizeof(WCHAR),
 931                         curr, FileNameU.Length - Length);
 932                     FileNameU.Length += (USHORT)(FCB->PathNameU.Length - Length);
 933                     curr = FileNameU.Buffer + FCB->PathNameU.Length / sizeof(WCHAR);
 934                     last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
 935                 }
 936                 RtlCopyMemory(FileNameU.Buffer, FCB->PathNameU.Buffer, FCB->PathNameU.Length);
 937             }
 938         }
 939         else
 940         {
 941             FCB = NULL;
 942         }
 943
 944         if (FCB == NULL)
 945         {
 946             FCB = vfatOpenRootFCB(pVCB);
 947             curr = FileNameU.Buffer;
 948         }
 949
 950         parentFCB = NULL;
 951         prev = curr;
 952     }
 953     else
 954     {
 955         /* Make absolute path */
 956         RtlCopyUnicodeString(&FileNameU, &parentFCB->PathNameU);
 957         curr = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
 958         if (*curr != L'\\')
 959         {
 960             RtlAppendUnicodeToString(&FileNameU, L"\\");
 961             curr++;
 962         }
 963         ASSERT(*curr == L'\\');
 964         RtlAppendUnicodeStringToString(&FileNameU, pFileNameU);
 965
 966         FCB = parentFCB;
 967         parentFCB = NULL;
 968         prev = curr;
 969         last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
 970     }
 971
 972     while (curr <= last)
 973     {
 974         if (parentFCB)
 975         {
 976             vfatReleaseFCB(pVCB, parentFCB);
 977             parentFCB = NULL;
 978         }
 979         //  fail if element in FCB is not a directory
 980         if (!vfatFCBIsDirectory(FCB))
 981         {
 982             DPRINT ("Element in requested path is not a directory\n");
 983
 984             vfatReleaseFCB(pVCB, FCB);
 985             FCB = NULL;
 986             *pParentFCB = NULL;
 987             *pFCB = NULL;
 988
 989             return  STATUS_OBJECT_PATH_NOT_FOUND;
 990         }
 991         parentFCB = FCB;
 992         if (prev < curr)
 993         {
 994             Length = (curr - prev) * sizeof(WCHAR);
 995             if (Length != parentFCB->LongNameU.Length)
 996             {
 997                 if (FileNameU.Length + parentFCB->LongNameU.Length - Length > FileNameU.MaximumLength)
 998                 {
 999                     vfatReleaseFCB(pVCB, parentFCB);
1000                     *pParentFCB = NULL;
1001                     *pFCB = NULL;
1002                     return STATUS_OBJECT_NAME_INVALID;
1003                 }
1004                 RtlMoveMemory(prev + parentFCB->LongNameU.Length / sizeof(WCHAR), curr,
1005                     FileNameU.Length - (curr - FileNameU.Buffer) * sizeof(WCHAR));
1006                 FileNameU.Length += (USHORT)(parentFCB->LongNameU.Length - Length);
1007                 curr = prev + parentFCB->LongNameU.Length / sizeof(WCHAR);
1008                 last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
1009             }
1010             RtlCopyMemory(prev, parentFCB->LongNameU.Buffer, parentFCB->LongNameU.Length);
1011         }
1012         curr++;
1013         prev = curr;
1014         while (*curr != L'\\' && curr <= last)
1015         {
1016             curr++;
1017         }
1018         NameU.Buffer = FileNameU.Buffer;
1019         NameU.Length = (curr - NameU.Buffer) * sizeof(WCHAR);
1020         NameU.MaximumLength = FileNameU.MaximumLength;
1021         DPRINT("%wZ\n", &NameU);
1022         FCB = vfatGrabFCBFromTable(pVCB, &NameU);
1023         if (FCB == NULL)
1024         {
1025             NameU.Buffer = prev;
1026             NameU.MaximumLength = NameU.Length = (curr - prev) * sizeof(WCHAR);
1027             status = vfatDirFindFile(pVCB, parentFCB, &NameU, &FCB);
1028             if (status == STATUS_OBJECT_NAME_NOT_FOUND)
1029             {
1030                 *pFCB = NULL;
1031                 if (curr > last)
1032                 {
1033                     *pParentFCB = parentFCB;
1034                     return STATUS_OBJECT_NAME_NOT_FOUND;
1035                 }
1036                 else
1037                 {
1038                     vfatReleaseFCB(pVCB, parentFCB);
1039                     *pParentFCB = NULL;
1040                     return STATUS_OBJECT_PATH_NOT_FOUND;
1041                 }
1042             }
1043             else if (!NT_SUCCESS(status))
1044             {
1045                 vfatReleaseFCB(pVCB, parentFCB);
1046                 *pParentFCB = NULL;
1047                 *pFCB = NULL;
1048
1049                 return status;
1050             }
1051         }
1052     }
1053
1054     *pParentFCB = parentFCB;
1055     *pFCB = FCB;
1056
1057     return STATUS_SUCCESS;
1058 }