reactos/drivers/filesystems/ntfs/mft.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 2002 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
  18  *
  19  * COPYRIGHT:        See COPYING in the top level directory
  20  * PROJECT:          ReactOS kernel
  21  * FILE:             drivers/filesystem/ntfs/mft.c
  22  * PURPOSE:          NTFS filesystem driver
  23  * PROGRAMMER:       Eric Kohl
  24  *                   Updated by Valentin Verkhovsky  2003/09/12
  25  */
  26
  27 /* INCLUDES *****************************************************************/
  28
  29 #include "ntfs.h"
  30
  31 #define NDEBUG
  32 #include <debug.h>
  33
  34 /* FUNCTIONS ****************************************************************/
  35
  36 PNTFS_ATTR_CONTEXT
  37 PrepareAttributeContext(PNTFS_ATTR_RECORD AttrRecord)
  38 {
  39     PNTFS_ATTR_CONTEXT Context;
  40
  41     Context = ExAllocatePoolWithTag(NonPagedPool,
  42                                     FIELD_OFFSET(NTFS_ATTR_CONTEXT, Record) + AttrRecord->Length,
  43                                     TAG_NTFS);
  44     RtlCopyMemory(&Context->Record, AttrRecord, AttrRecord->Length);
  45     if (AttrRecord->IsNonResident)
  46     {
  47         LONGLONG DataRunOffset;
  48         ULONGLONG DataRunLength;
  49
  50         Context->CacheRun = (PUCHAR)&Context->Record + Context->Record.NonResident.MappingPairsOffset;
  51         Context->CacheRunOffset = 0;
  52         Context->CacheRun = DecodeRun(Context->CacheRun, &DataRunOffset, &DataRunLength);
  53         Context->CacheRunLength = DataRunLength;
  54         if (DataRunOffset != -1)
  55         {
  56             /* Normal run. */
  57             Context->CacheRunStartLCN =
  58             Context->CacheRunLastLCN = DataRunOffset;
  59         }
  60         else
  61         {
  62             /* Sparse run. */
  63             Context->CacheRunStartLCN = -1;
  64             Context->CacheRunLastLCN = 0;
  65         }
  66         Context->CacheRunCurrentOffset = 0;
  67     }
  68
  69     return Context;
  70 }
  71
  72
  73 VOID
  74 ReleaseAttributeContext(PNTFS_ATTR_CONTEXT Context)
  75 {
  76     ExFreePoolWithTag(Context, TAG_NTFS);
  77 }
  78
  79
  80 PNTFS_ATTR_CONTEXT
  81 FindAttributeHelper(PDEVICE_EXTENSION Vcb,
  82                     PNTFS_ATTR_RECORD AttrRecord,
  83                     PNTFS_ATTR_RECORD AttrRecordEnd,
  84                     ULONG Type,
  85                     PCWSTR Name,
  86                     ULONG NameLength)
  87 {
  88     DPRINT("FindAttributeHelper(%p, %p, %p, 0x%x, %S, %u)\n", Vcb, AttrRecord, AttrRecordEnd, Type, Name, NameLength);
  89
  90     while (AttrRecord < AttrRecordEnd)
  91     {
  92         DPRINT("AttrRecord->Type = 0x%x\n", AttrRecord->Type);
  93
  94         if (AttrRecord->Type == AttributeEnd)
  95             break;
  96
  97         if (AttrRecord->Type == AttributeAttributeList)
  98         {
  99             PNTFS_ATTR_CONTEXT Context;
 100             PNTFS_ATTR_CONTEXT ListContext;
 101             PVOID ListBuffer;
 102             ULONGLONG ListSize;
 103             PNTFS_ATTR_RECORD ListAttrRecord;
 104             PNTFS_ATTR_RECORD ListAttrRecordEnd;
 105
 106             // Do not handle non-resident yet
 107             ASSERT(!(AttrRecord->IsNonResident & 1));
 108
 109             ListContext = PrepareAttributeContext(AttrRecord);
 110
 111             ListSize = AttributeDataLength(&ListContext->Record);
 112             if(ListSize <= 0xFFFFFFFF)
 113                 ListBuffer = ExAllocatePoolWithTag(NonPagedPool, (ULONG)ListSize, TAG_NTFS);
 114             else
 115                 ListBuffer = NULL;
 116
 117             if(!ListBuffer)
 118             {
 119                 DPRINT("Failed to allocate memory: %x\n", (ULONG)ListSize);
 120                 continue;
 121             }
 122
 123             ListAttrRecord = (PNTFS_ATTR_RECORD)ListBuffer;
 124             ListAttrRecordEnd = (PNTFS_ATTR_RECORD)((PCHAR)ListBuffer + ListSize);
 125
 126             if (ReadAttribute(Vcb, ListContext, 0, ListBuffer, (ULONG)ListSize) == ListSize)
 127             {
 128                 Context = FindAttributeHelper(Vcb, ListAttrRecord, ListAttrRecordEnd,
 129                                               Type, Name, NameLength);
 130
 131                 ReleaseAttributeContext(ListContext);
 132                 ExFreePoolWithTag(ListBuffer, TAG_NTFS);
 133
 134                 if (Context != NULL)
 135                 {
 136                     DPRINT("Found context = %p\n", Context);
 137                     return Context;
 138                 }
 139             }
 140         }
 141
 142         if (AttrRecord->Type == Type)
 143         {
 144             if (AttrRecord->NameLength == NameLength)
 145             {
 146                 PWCHAR AttrName;
 147
 148                 AttrName = (PWCHAR)((PCHAR)AttrRecord + AttrRecord->NameOffset);
 149                 DPRINT("%.*S, %.*S\n", AttrRecord->NameLength, AttrName, NameLength, Name);
 150                 if (RtlCompareMemory(AttrName, Name, NameLength << 1) == (NameLength << 1))
 151                 {
 152                     /* Found it, fill up the context and return. */
 153                     DPRINT("Found context\n");
 154                     return PrepareAttributeContext(AttrRecord);
 155                 }
 156             }
 157         }
 158
 159         if (AttrRecord->Length == 0)
 160         {
 161             DPRINT("Null length attribute record\n");
 162             return NULL;
 163         }
 164         AttrRecord = (PNTFS_ATTR_RECORD)((PCHAR)AttrRecord + AttrRecord->Length);
 165     }
 166
 167     DPRINT("Ended\n");
 168     return NULL;
 169 }
 170
 171
 172 NTSTATUS
 173 FindAttribute(PDEVICE_EXTENSION Vcb,
 174               PFILE_RECORD_HEADER MftRecord,
 175               ULONG Type,
 176               PCWSTR Name,
 177               ULONG NameLength,
 178               PNTFS_ATTR_CONTEXT * AttrCtx)
 179 {
 180     PNTFS_ATTR_RECORD AttrRecord;
 181     PNTFS_ATTR_RECORD AttrRecordEnd;
 182
 183     DPRINT("FindAttribute(%p, %p, 0x%x, %S, %u, %p)\n", Vcb, MftRecord, Type, Name, NameLength, AttrCtx);
 184
 185     AttrRecord = (PNTFS_ATTR_RECORD)((PCHAR)MftRecord + MftRecord->AttributeOffset);
 186     AttrRecordEnd = (PNTFS_ATTR_RECORD)((PCHAR)MftRecord + Vcb->NtfsInfo.BytesPerFileRecord);
 187
 188     *AttrCtx = FindAttributeHelper(Vcb, AttrRecord, AttrRecordEnd, Type, Name, NameLength);
 189     if (*AttrCtx == NULL)
 190     {
 191         return STATUS_OBJECT_NAME_NOT_FOUND;
 192     }
 193
 194     return STATUS_SUCCESS;
 195 }
 196
 197
 198 ULONG
 199 AttributeAllocatedLength(PNTFS_ATTR_RECORD AttrRecord)
 200 {
 201     if (AttrRecord->IsNonResident)
 202         return AttrRecord->NonResident.AllocatedSize;
 203     else
 204         return AttrRecord->Resident.ValueLength;
 205 }
 206
 207
 208 ULONGLONG
 209 AttributeDataLength(PNTFS_ATTR_RECORD AttrRecord)
 210 {
 211     if (AttrRecord->IsNonResident)
 212         return AttrRecord->NonResident.DataSize;
 213     else
 214         return AttrRecord->Resident.ValueLength;
 215 }
 216
 217
 218 ULONG
 219 ReadAttribute(PDEVICE_EXTENSION Vcb,
 220               PNTFS_ATTR_CONTEXT Context,
 221               ULONGLONG Offset,
 222               PCHAR Buffer,
 223               ULONG Length)
 224 {
 225     ULONGLONG LastLCN;
 226     PUCHAR DataRun;
 227     LONGLONG DataRunOffset;
 228     ULONGLONG DataRunLength;
 229     LONGLONG DataRunStartLCN;
 230     ULONGLONG CurrentOffset;
 231     ULONG ReadLength;
 232     ULONG AlreadyRead;
 233     NTSTATUS Status;
 234
 235     if (!Context->Record.IsNonResident)
 236     {
 237         if (Offset > Context->Record.Resident.ValueLength)
 238             return 0;
 239         if (Offset + Length > Context->Record.Resident.ValueLength)
 240             Length = (ULONG)(Context->Record.Resident.ValueLength - Offset);
 241         RtlCopyMemory(Buffer, (PCHAR)&Context->Record + Context->Record.Resident.ValueOffset + Offset, Length);
 242         return Length;
 243     }
 244
 245     /*
 246      * Non-resident attribute
 247      */
 248
 249     /*
 250      * I. Find the corresponding start data run.
 251      */
 252
 253     AlreadyRead = 0;
 254
 255     // FIXME: Cache seems to be non-working. Disable it for now
 256     //if(Context->CacheRunOffset <= Offset && Offset < Context->CacheRunOffset + Context->CacheRunLength * Volume->ClusterSize)
 257     if (0)
 258     {
 259         DataRun = Context->CacheRun;
 260         LastLCN = Context->CacheRunLastLCN;
 261         DataRunStartLCN = Context->CacheRunStartLCN;
 262         DataRunLength = Context->CacheRunLength;
 263         CurrentOffset = Context->CacheRunCurrentOffset;
 264     }
 265     else
 266     {
 267         LastLCN = 0;
 268         DataRun = (PUCHAR)&Context->Record + Context->Record.NonResident.MappingPairsOffset;
 269         CurrentOffset = 0;
 270
 271         while (1)
 272         {
 273             DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
 274             if (DataRunOffset != -1)
 275             {
 276                 /* Normal data run. */
 277                 DataRunStartLCN = LastLCN + DataRunOffset;
 278                 LastLCN = DataRunStartLCN;
 279             }
 280             else
 281             {
 282                 /* Sparse data run. */
 283                 DataRunStartLCN = -1;
 284             }
 285
 286             if (Offset >= CurrentOffset &&
 287                 Offset < CurrentOffset + (DataRunLength * Vcb->NtfsInfo.BytesPerCluster))
 288             {
 289                 break;
 290             }
 291
 292             if (*DataRun == 0)
 293             {
 294                 return AlreadyRead;
 295             }
 296
 297             CurrentOffset += DataRunLength * Vcb->NtfsInfo.BytesPerCluster;
 298         }
 299     }
 300
 301     /*
 302      * II. Go through the run list and read the data
 303      */
 304
 305     ReadLength = (ULONG)min(DataRunLength * Vcb->NtfsInfo.BytesPerCluster - (Offset - CurrentOffset), Length);
 306     if (DataRunStartLCN == -1)
 307         RtlZeroMemory(Buffer, ReadLength);
 308     Status = NtfsReadDisk(Vcb->StorageDevice,
 309                           DataRunStartLCN * Vcb->NtfsInfo.BytesPerCluster + Offset - CurrentOffset,
 310                           ReadLength,
 311                           (PVOID)Buffer,
 312                           FALSE);
 313     if (NT_SUCCESS(Status))
 314     {
 315         Length -= ReadLength;
 316         Buffer += ReadLength;
 317         AlreadyRead += ReadLength;
 318
 319         if (ReadLength == DataRunLength * Vcb->NtfsInfo.BytesPerCluster - (Offset - CurrentOffset))
 320         {
 321             CurrentOffset += DataRunLength * Vcb->NtfsInfo.BytesPerCluster;
 322             DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
 323             if (DataRunLength != (ULONGLONG)-1)
 324             {
 325                 DataRunStartLCN = LastLCN + DataRunOffset;
 326                 LastLCN = DataRunStartLCN;
 327             }
 328             else
 329                 DataRunStartLCN = -1;
 330
 331             if (*DataRun == 0)
 332                 return AlreadyRead;
 333         }
 334
 335         while (Length > 0)
 336         {
 337             ReadLength = (ULONG)min(DataRunLength * Vcb->NtfsInfo.BytesPerCluster, Length);
 338             if (DataRunStartLCN == -1)
 339                 RtlZeroMemory(Buffer, ReadLength);
 340             else
 341             {
 342                 Status = NtfsReadDisk(Vcb->StorageDevice,
 343                                       DataRunStartLCN * Vcb->NtfsInfo.BytesPerCluster,
 344                                       ReadLength,
 345                                       (PVOID)Buffer,
 346                                       FALSE);
 347                 if (!NT_SUCCESS(Status))
 348                     break;
 349             }
 350
 351             Length -= ReadLength;
 352             Buffer += ReadLength;
 353             AlreadyRead += ReadLength;
 354
 355             /* We finished this request, but there still data in this data run. */
 356             if (Length == 0 && ReadLength != DataRunLength * Vcb->NtfsInfo.BytesPerCluster)
 357                 break;
 358
 359             /*
 360              * Go to next run in the list.
 361              */
 362
 363             if (*DataRun == 0)
 364                 break;
 365             CurrentOffset += DataRunLength * Vcb->NtfsInfo.BytesPerCluster;
 366             DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
 367             if (DataRunOffset != -1)
 368             {
 369                 /* Normal data run. */
 370                 DataRunStartLCN = LastLCN + DataRunOffset;
 371                 LastLCN = DataRunStartLCN;
 372             }
 373             else
 374             {
 375                 /* Sparse data run. */
 376                 DataRunStartLCN = -1;
 377             }
 378         } /* while */
 379
 380     } /* if Disk */
 381
 382     Context->CacheRun = DataRun;
 383     Context->CacheRunOffset = Offset + AlreadyRead;
 384     Context->CacheRunStartLCN = DataRunStartLCN;
 385     Context->CacheRunLength = DataRunLength;
 386     Context->CacheRunLastLCN = LastLCN;
 387     Context->CacheRunCurrentOffset = CurrentOffset;
 388
 389     return AlreadyRead;
 390 }
 391
 392
 393 NTSTATUS
 394 ReadFileRecord(PDEVICE_EXTENSION Vcb,
 395                ULONGLONG index,
 396                PFILE_RECORD_HEADER file)
 397 {
 398     ULONGLONG BytesRead;
 399
 400     DPRINT("ReadFileRecord(%p, %I64x, %p)\n", Vcb, index, file);
 401
 402     BytesRead = ReadAttribute(Vcb, Vcb->MFTContext, index * Vcb->NtfsInfo.BytesPerFileRecord, (PCHAR)file, Vcb->NtfsInfo.BytesPerFileRecord);
 403     if (BytesRead != Vcb->NtfsInfo.BytesPerFileRecord)
 404     {
 405         DPRINT1("ReadFileRecord failed: %I64u read, %u expected\n", BytesRead, Vcb->NtfsInfo.BytesPerFileRecord);
 406         return STATUS_PARTIAL_COPY;
 407     }
 408
 409     /* Apply update sequence array fixups. */
 410     return FixupUpdateSequenceArray(Vcb, &file->Ntfs);
 411 }
 412
 413
 414 NTSTATUS
 415 FixupUpdateSequenceArray(PDEVICE_EXTENSION Vcb,
 416                          PNTFS_RECORD_HEADER Record)
 417 {
 418     USHORT *USA;
 419     USHORT USANumber;
 420     USHORT USACount;
 421     USHORT *Block;
 422
 423     USA = (USHORT*)((PCHAR)Record + Record->UsaOffset);
 424     USANumber = *(USA++);
 425     USACount = Record->UsaCount - 1; /* Exclude the USA Number. */
 426     Block = (USHORT*)((PCHAR)Record + Vcb->NtfsInfo.BytesPerSector - 2);
 427
 428     while (USACount)
 429     {
 430         if (*Block != USANumber)
 431         {
 432             DPRINT1("Mismatch with USA: %u read, %u expected\n" , *Block, USANumber);
 433             return STATUS_UNSUCCESSFUL;
 434         }
 435         *Block = *(USA++);
 436         Block = (USHORT*)((PCHAR)Block + Vcb->NtfsInfo.BytesPerSector);
 437         USACount--;
 438     }
 439
 440     return STATUS_SUCCESS;
 441 }
 442
 443
 444 NTSTATUS
 445 ReadLCN(PDEVICE_EXTENSION Vcb,
 446         ULONGLONG lcn,
 447         ULONG count,
 448         PVOID buffer)
 449 {
 450     LARGE_INTEGER DiskSector;
 451
 452     DiskSector.QuadPart = lcn;
 453
 454     return NtfsReadSectors(Vcb->StorageDevice,
 455                            DiskSector.u.LowPart * Vcb->NtfsInfo.SectorsPerCluster,
 456                            count * Vcb->NtfsInfo.SectorsPerCluster,
 457                            Vcb->NtfsInfo.BytesPerSector,
 458                            buffer,
 459                            FALSE);
 460 }
 461
 462
 463 BOOLEAN
 464 CompareFileName(PUNICODE_STRING FileName,
 465                 PINDEX_ENTRY_ATTRIBUTE IndexEntry,
 466                 BOOLEAN DirSearch)
 467 {
 468     UNICODE_STRING EntryName;
 469
 470     EntryName.Buffer = IndexEntry->FileName.Name;
 471     EntryName.Length =
 472     EntryName.MaximumLength = IndexEntry->FileName.NameLength;
 473
 474     if (DirSearch)
 475     {
 476         return FsRtlIsNameInExpression(FileName, &EntryName, (IndexEntry->FileName.NameType != NTFS_FILE_NAME_POSIX), NULL);
 477     }
 478     else
 479     {
 480         return (RtlCompareUnicodeString(FileName, &EntryName, (IndexEntry->FileName.NameType != NTFS_FILE_NAME_POSIX)) == TRUE);
 481     }
 482 }
 483
 484
 485 NTSTATUS
 486 NtfsFindMftRecord(PDEVICE_EXTENSION Vcb,
 487                   ULONGLONG MFTIndex,
 488                   PUNICODE_STRING FileName,
 489                   PULONG FirstEntry,
 490                   BOOLEAN DirSearch,
 491                   ULONGLONG *OutMFTIndex)
 492 {
 493     PFILE_RECORD_HEADER MftRecord;
 494     //ULONG Magic;
 495     PNTFS_ATTR_CONTEXT IndexRootCtx;
 496     PNTFS_ATTR_CONTEXT IndexBitmapCtx;
 497     PNTFS_ATTR_CONTEXT IndexAllocationCtx;
 498     PINDEX_ROOT_ATTRIBUTE IndexRoot;
 499     PINDEX_BUFFER IndexBuffer;
 500     ULONGLONG BitmapDataSize;
 501     ULONGLONG IndexAllocationSize;
 502     PCHAR BitmapData;
 503     PCHAR IndexRecord;
 504     PINDEX_ENTRY_ATTRIBUTE IndexEntry, IndexEntryEnd;
 505     ULONG RecordOffset;
 506     ULONG IndexBlockSize;
 507     NTSTATUS Status;
 508     ULONG CurrentEntry = 0;
 509
 510     DPRINT("NtfsFindMftRecord(%p, %I64d, %wZ, %p, %u, %p)\n", Vcb, MFTIndex, FileName, FirstEntry, DirSearch, OutMFTIndex);
 511
 512     MftRecord = ExAllocatePoolWithTag(NonPagedPool,
 513                                       Vcb->NtfsInfo.BytesPerFileRecord,
 514                                       TAG_NTFS);
 515     if (MftRecord == NULL)
 516     {
 517         return STATUS_INSUFFICIENT_RESOURCES;
 518     }
 519
 520     if (NT_SUCCESS(ReadFileRecord(Vcb, MFTIndex, MftRecord)))
 521     {
 522         //Magic = MftRecord->Magic;
 523
 524         Status = FindAttribute(Vcb, MftRecord, AttributeIndexRoot, L"$I30", 4, &IndexRootCtx);
 525         if (!NT_SUCCESS(Status))
 526         {
 527             ExFreePoolWithTag(MftRecord, TAG_NTFS);
 528             return Status;
 529         }
 530
 531         IndexRecord = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerIndexRecord, TAG_NTFS);
 532         if (IndexRecord == NULL)
 533         {
 534             ExFreePoolWithTag(MftRecord, TAG_NTFS);
 535             return STATUS_INSUFFICIENT_RESOURCES;
 536         }
 537
 538         ReadAttribute(Vcb, IndexRootCtx, 0, IndexRecord, Vcb->NtfsInfo.BytesPerIndexRecord);
 539         IndexRoot = (PINDEX_ROOT_ATTRIBUTE)IndexRecord;
 540         IndexEntry = (PINDEX_ENTRY_ATTRIBUTE)((PCHAR)&IndexRoot->Header + IndexRoot->Header.FirstEntryOffset);
 541         /* Index root is always resident. */
 542         IndexEntryEnd = (PINDEX_ENTRY_ATTRIBUTE)(IndexRecord + IndexRootCtx->Record.Resident.ValueLength);
 543         ReleaseAttributeContext(IndexRootCtx);
 544
 545         DPRINT("IndexRecordSize: %x IndexBlockSize: %x\n", Vcb->NtfsInfo.BytesPerIndexRecord, IndexRoot->SizeOfEntry);
 546
 547         while (IndexEntry < IndexEntryEnd &&
 548                !(IndexEntry->Flags & NTFS_INDEX_ENTRY_END))
 549         {
 550             if ((IndexEntry->Data.Directory.IndexedFile & NTFS_MFT_MASK) > 0x10 &&
 551                 CurrentEntry >= *FirstEntry &&
 552                 CompareFileName(FileName, IndexEntry, DirSearch))
 553             {
 554                 *OutMFTIndex = (IndexEntry->Data.Directory.IndexedFile & NTFS_MFT_MASK);
 555                 *FirstEntry = CurrentEntry;
 556                 ExFreePoolWithTag(IndexRecord, TAG_NTFS);
 557                 ExFreePoolWithTag(MftRecord, TAG_NTFS);
 558                 return STATUS_SUCCESS;
 559             }
 560
 561             ++CurrentEntry;
 562             IndexEntry = (PINDEX_ENTRY_ATTRIBUTE)((PCHAR)IndexEntry + IndexEntry->Length);
 563         }
 564
 565         if (IndexRoot->Header.Flags & INDEX_ROOT_LARGE)
 566         {
 567             DPRINT("Large Index!\n");
 568
 569             IndexBlockSize = IndexRoot->SizeOfEntry;
 570
 571             Status = FindAttribute(Vcb, MftRecord, AttributeBitmap, L"$I30", 4, &IndexBitmapCtx);
 572             if (!NT_SUCCESS(Status))
 573             {
 574                 DPRINT1("Corrupted filesystem!\n");
 575                 ExFreePoolWithTag(MftRecord, TAG_NTFS);
 576                 return Status;
 577             }
 578             BitmapDataSize = AttributeDataLength(&IndexBitmapCtx->Record);
 579             DPRINT("BitmapDataSize: %x\n", (ULONG)BitmapDataSize);
 580             if(BitmapDataSize <= 0xFFFFFFFF)
 581                 BitmapData = ExAllocatePoolWithTag(NonPagedPool, (ULONG)BitmapDataSize, TAG_NTFS);
 582             else
 583                 BitmapData = NULL;
 584
 585             if (BitmapData == NULL)
 586             {
 587                 ExFreePoolWithTag(IndexRecord, TAG_NTFS);
 588                 ExFreePoolWithTag(MftRecord, TAG_NTFS);
 589                 return STATUS_INSUFFICIENT_RESOURCES;
 590             }
 591             ReadAttribute(Vcb, IndexBitmapCtx, 0, BitmapData, (ULONG)BitmapDataSize);
 592             ReleaseAttributeContext(IndexBitmapCtx);
 593
 594             Status = FindAttribute(Vcb, MftRecord, AttributeIndexAllocation, L"$I30", 4, &IndexAllocationCtx);
 595             if (!NT_SUCCESS(Status))
 596             {
 597                 DPRINT("Corrupted filesystem!\n");
 598                 ExFreePoolWithTag(BitmapData, TAG_NTFS);
 599                 ExFreePoolWithTag(IndexRecord, TAG_NTFS);
 600                 ExFreePoolWithTag(MftRecord, TAG_NTFS);
 601                 return Status;
 602             }
 603             IndexAllocationSize = AttributeDataLength(&IndexAllocationCtx->Record);
 604
 605             RecordOffset = 0;
 606
 607             for (;;)
 608             {
 609                 DPRINT("RecordOffset: %x IndexAllocationSize: %x\n", RecordOffset, IndexAllocationSize);
 610                 for (; RecordOffset < IndexAllocationSize;)
 611                 {
 612                     UCHAR Bit = 1 << ((RecordOffset / IndexBlockSize) & 7);
 613                     ULONG Byte = (RecordOffset / IndexBlockSize) >> 3;
 614                     if ((BitmapData[Byte] & Bit))
 615                         break;
 616                     RecordOffset += IndexBlockSize;
 617                 }
 618
 619                 if (RecordOffset >= IndexAllocationSize)
 620                 {
 621                     break;
 622                 }
 623
 624                 ReadAttribute(Vcb, IndexAllocationCtx, RecordOffset, IndexRecord, IndexBlockSize);
 625
 626                 if (!NT_SUCCESS(FixupUpdateSequenceArray(Vcb, &((PFILE_RECORD_HEADER)IndexRecord)->Ntfs)))
 627                 {
 628                     break;
 629                 }
 630
 631                 IndexBuffer = (PINDEX_BUFFER)IndexRecord;
 632                 ASSERT(IndexBuffer->Ntfs.Type == 'XDNI');
 633                 ASSERT(IndexBuffer->Header.AllocatedSize + 0x18 == IndexBlockSize);
 634                 IndexEntry = (PINDEX_ENTRY_ATTRIBUTE)(&IndexBuffer->Header + IndexBuffer->Header.FirstEntryOffset);
 635                 IndexEntryEnd = (PINDEX_ENTRY_ATTRIBUTE)(&IndexBuffer->Header + IndexBuffer->Header.TotalSizeOfEntries);
 636                 //ASSERT(IndexEntryEnd <= (PINDEX_ENTRY_ATTRIBUTE)((ULONG_PTR)IndexBuffer + IndexBlockSize)); FIXME: Why doesn't it work?
 637
 638                 while (IndexEntry < IndexEntryEnd &&
 639                        !(IndexEntry->Flags & NTFS_INDEX_ENTRY_END))
 640                 {
 641                     if ((IndexEntry->Data.Directory.IndexedFile & NTFS_MFT_MASK) > 0x10 &&
 642                         CurrentEntry >= *FirstEntry &&
 643                         CompareFileName(FileName, IndexEntry, DirSearch))
 644                     {
 645                         DPRINT("File found\n");
 646                         *OutMFTIndex = (IndexEntry->Data.Directory.IndexedFile & NTFS_MFT_MASK);
 647                         *FirstEntry = CurrentEntry;
 648                         ExFreePoolWithTag(BitmapData, TAG_NTFS);
 649                         ExFreePoolWithTag(IndexRecord, TAG_NTFS);
 650                         ExFreePoolWithTag(MftRecord, TAG_NTFS);
 651                         ReleaseAttributeContext(IndexAllocationCtx);
 652                         return STATUS_SUCCESS;
 653                     }
 654
 655                     ++CurrentEntry;
 656                     IndexEntry = (PINDEX_ENTRY_ATTRIBUTE)((PCHAR)IndexEntry + IndexEntry->Length);
 657                 }
 658
 659                 RecordOffset += IndexBlockSize;
 660             }
 661
 662             ReleaseAttributeContext(IndexAllocationCtx);
 663             ExFreePoolWithTag(BitmapData, TAG_NTFS);
 664         }
 665
 666         ExFreePoolWithTag(IndexRecord, TAG_NTFS);
 667     }
 668     else
 669     {
 670         DPRINT("Can't read MFT record\n");
 671     }
 672     ExFreePoolWithTag(MftRecord, TAG_NTFS);
 673
 674     return STATUS_OBJECT_PATH_NOT_FOUND;
 675 }
 676
 677 NTSTATUS
 678 NtfsLookupFileAt(PDEVICE_EXTENSION Vcb,
 679                  PUNICODE_STRING PathName,
 680                  PFILE_RECORD_HEADER *FileRecord,
 681                  PNTFS_ATTR_CONTEXT *DataContext,
 682                  PULONGLONG MFTIndex,
 683                  ULONGLONG CurrentMFTIndex)
 684 {
 685     UNICODE_STRING Current, Remaining;
 686     NTSTATUS Status;
 687     ULONG FirstEntry = 0;
 688
 689     DPRINT("NtfsLookupFileAt(%p, %wZ, %p, %p, %I64x)\n", Vcb, PathName, FileRecord, DataContext, CurrentMFTIndex);
 690
 691     FsRtlDissectName(*PathName, &Current, &Remaining);
 692
 693     while (Current.Length != 0)
 694     {
 695         DPRINT("Current: %wZ\n", &Current);
 696
 697         Status = NtfsFindMftRecord(Vcb, CurrentMFTIndex, &Current, &FirstEntry, FALSE, &CurrentMFTIndex);
 698         if (!NT_SUCCESS(Status))
 699         {
 700             return Status;
 701         }
 702
 703         if (Remaining.Length == 0)
 704             return STATUS_OBJECT_PATH_NOT_FOUND;
 705
 706         FsRtlDissectName(Current, &Current, &Remaining);
 707     }
 708
 709     *FileRecord = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
 710     if (*FileRecord == NULL)
 711     {
 712         DPRINT("NtfsLookupFileAt: Can't allocate MFT record\n");
 713         return STATUS_INSUFFICIENT_RESOURCES;
 714     }
 715
 716     Status = ReadFileRecord(Vcb, CurrentMFTIndex, *FileRecord);
 717     if (!NT_SUCCESS(Status))
 718     {
 719         DPRINT("NtfsLookupFileAt: Can't read MFT record\n");
 720         ExFreePoolWithTag(*FileRecord, TAG_NTFS);
 721         return Status;
 722     }
 723
 724     if (!((*FileRecord)->Flags & FRH_DIRECTORY))
 725     {
 726         Status = FindAttribute(Vcb, *FileRecord, AttributeData, L"", 0, DataContext);
 727         if (!NT_SUCCESS(Status))
 728         {
 729             DPRINT("NtfsLookupFileAt: Can't find data attribute\n");
 730             ExFreePoolWithTag(*FileRecord, TAG_NTFS);
 731             return Status;
 732         }
 733     }
 734     else
 735     {
 736         *DataContext = NULL;
 737     }
 738
 739     *MFTIndex = CurrentMFTIndex;
 740
 741     return STATUS_SUCCESS;
 742 }
 743
 744 NTSTATUS
 745 NtfsLookupFile(PDEVICE_EXTENSION Vcb,
 746                PUNICODE_STRING PathName,
 747                PFILE_RECORD_HEADER *FileRecord,
 748                PNTFS_ATTR_CONTEXT *DataContext,
 749                PULONGLONG MFTIndex)
 750 {
 751     return NtfsLookupFileAt(Vcb, PathName, FileRecord, DataContext, MFTIndex, NTFS_FILE_ROOT);
 752 }
 753
 754 NTSTATUS
 755 NtfsFindFileAt(PDEVICE_EXTENSION Vcb,
 756                PUNICODE_STRING SearchPattern,
 757                PULONG FirstEntry,
 758                PFILE_RECORD_HEADER *FileRecord,
 759                PNTFS_ATTR_CONTEXT *DataContext,
 760                PULONGLONG MFTIndex,
 761                ULONGLONG CurrentMFTIndex)
 762 {
 763     NTSTATUS Status;
 764
 765     DPRINT("NtfsFindFileAt(%p, %wZ, %p, %p, %p, %p, %I64x)\n", Vcb, SearchPattern, FirstEntry, FileRecord, DataContext, MFTIndex, CurrentMFTIndex);
 766
 767     Status = NtfsFindMftRecord(Vcb, CurrentMFTIndex, SearchPattern, FirstEntry, TRUE, &CurrentMFTIndex);
 768     if (!NT_SUCCESS(Status))
 769     {
 770         DPRINT("NtfsFindFileAt: NtfsFindMftRecord() failed with status 0x%08lx\n", Status);
 771         return Status;
 772     }
 773
 774     *FileRecord = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
 775     if (*FileRecord == NULL)
 776     {
 777         DPRINT("NtfsFindFileAt: Can't allocate MFT record\n");
 778         return STATUS_INSUFFICIENT_RESOURCES;
 779     }
 780
 781     Status = ReadFileRecord(Vcb, CurrentMFTIndex, *FileRecord);
 782     if (!NT_SUCCESS(Status))
 783     {
 784         DPRINT("NtfsFindFileAt: Can't read MFT record\n");
 785         ExFreePoolWithTag(*FileRecord, TAG_NTFS);
 786         return Status;
 787     }
 788
 789     if (!((*FileRecord)->Flags & FRH_DIRECTORY))
 790     {
 791         Status = FindAttribute(Vcb, *FileRecord, AttributeData, L"", 0, DataContext);
 792         if (!NT_SUCCESS(Status))
 793         {
 794             DPRINT("NtfsFindFileAt: Can't find data attribute\n");
 795             ExFreePoolWithTag(*FileRecord, TAG_NTFS);
 796             return Status;
 797         }
 798     }
 799     else
 800     {
 801         *DataContext = NULL;
 802     }
 803
 804     *MFTIndex = CurrentMFTIndex;
 805
 806     return STATUS_SUCCESS;
 807 }
 808
 809 /* EOF */