reactos/drivers/filesystems/fastfat/dirwr.c

   1 /*
   2  * COPYRIGHT:        See COPYING in the top level directory
   3  * PROJECT:          ReactOS kernel
   4  * FILE:             drivers/filesystems/fastfat/dirwr.c
   5  * PURPOSE:          VFAT Filesystem : write in directory
   6  * PROGRAMMER:       Rex Jolliff (rex@lvcablemodem.com)
   7  *                   Herve Poussineau (reactos@poussine.freesurf.fr)
   8  *                   Pierre Schweitzer (pierre@reactos.org)
   9  *
  10  */
  11
  12 /* INCLUDES *****************************************************************/
  13
  14 #include "vfat.h"
  15
  16 #define NDEBUG
  17 #include <debug.h>
  18
  19 /*
  20  * update an existing FAT entry
  21  */
  22 NTSTATUS
  23 VfatUpdateEntry(
  24     IN PVFATFCB pFcb)
  25 {
  26     PVOID Context;
  27     PDIR_ENTRY PinEntry;
  28     LARGE_INTEGER Offset;
  29     ULONG SizeDirEntry;
  30     ULONG dirIndex;
  31
  32     ASSERT(pFcb);
  33
  34     if (pFcb->Flags & FCB_IS_FATX_ENTRY)
  35     {
  36         SizeDirEntry = sizeof(FATX_DIR_ENTRY);
  37         dirIndex = pFcb->startIndex;
  38     }
  39     else
  40     {
  41         SizeDirEntry = sizeof(FAT_DIR_ENTRY);
  42         dirIndex = pFcb->dirIndex;
  43     }
  44
  45     DPRINT("updEntry dirIndex %u, PathName \'%wZ\'\n", dirIndex, &pFcb->PathNameU);
  46
  47     if (vfatFCBIsRoot(pFcb) || (pFcb->Flags & (FCB_IS_FAT|FCB_IS_VOLUME)))
  48     {
  49         return STATUS_SUCCESS;
  50     }
  51
  52     ASSERT(pFcb->parentFcb);
  53
  54     Offset.u.HighPart = 0;
  55     Offset.u.LowPart = dirIndex * SizeDirEntry;
  56     if (CcPinRead(pFcb->parentFcb->FileObject, &Offset, SizeDirEntry,
  57         TRUE, &Context, (PVOID*)&PinEntry))
  58     {
  59         pFcb->Flags &= ~FCB_IS_DIRTY;
  60         RtlCopyMemory(PinEntry, &pFcb->entry, SizeDirEntry);
  61         CcSetDirtyPinnedData(Context, NULL);
  62         CcUnpinData(Context);
  63         return STATUS_SUCCESS;
  64     }
  65     else
  66     {
  67         DPRINT1("Failed write to \'%wZ\'.\n", &pFcb->parentFcb->PathNameU);
  68         return STATUS_UNSUCCESSFUL;
  69     }
  70 }
  71
  72 /*
  73  * rename an existing FAT entry
  74  */
  75 NTSTATUS
  76 vfatRenameEntry(
  77     IN PDEVICE_EXTENSION DeviceExt,
  78     IN PVFATFCB pFcb,
  79     IN PUNICODE_STRING FileName,
  80     IN BOOLEAN CaseChangeOnly)
  81 {
  82     OEM_STRING NameA;
  83     ULONG StartIndex;
  84     PVOID Context = NULL;
  85     LARGE_INTEGER Offset;
  86     PFATX_DIR_ENTRY pDirEntry;
  87     NTSTATUS Status;
  88
  89     DPRINT("vfatRenameEntry(%p, %p, %wZ, %d)\n", DeviceExt, pFcb, FileName, CaseChangeOnly);
  90
  91     if (pFcb->Flags & FCB_IS_FATX_ENTRY)
  92     {
  93         VFAT_DIRENTRY_CONTEXT DirContext;
  94
  95         /* Open associated dir entry */
  96         StartIndex = pFcb->startIndex;
  97         Offset.u.HighPart = 0;
  98         Offset.u.LowPart = (StartIndex * sizeof(FATX_DIR_ENTRY) / PAGE_SIZE) * PAGE_SIZE;
  99         if (!CcPinRead(pFcb->parentFcb->FileObject, &Offset, sizeof(FATX_DIR_ENTRY), TRUE,
 100                        &Context, (PVOID*)&pDirEntry))
 101         {
 102             DPRINT1("CcPinRead(Offset %x:%x, Length %d) failed\n", Offset.u.HighPart, Offset.u.LowPart, PAGE_SIZE);
 103             return STATUS_UNSUCCESSFUL;
 104         }
 105
 106         pDirEntry = &pDirEntry[StartIndex % (PAGE_SIZE / sizeof(FATX_DIR_ENTRY))];
 107
 108         /* Set file name */
 109         NameA.Buffer = (PCHAR)pDirEntry->Filename;
 110         NameA.Length = 0;
 111         NameA.MaximumLength = 42;
 112         RtlUnicodeStringToOemString(&NameA, FileName, FALSE);
 113         pDirEntry->FilenameLength = (unsigned char)NameA.Length;
 114
 115         CcSetDirtyPinnedData(Context, NULL);
 116         CcUnpinData(Context);
 117
 118         /* Update FCB */
 119         DirContext.ShortNameU.Length = 0;
 120         DirContext.ShortNameU.MaximumLength = 0;
 121         DirContext.ShortNameU.Buffer = NULL;
 122         DirContext.LongNameU = *FileName;
 123         DirContext.DirEntry.FatX = *pDirEntry;
 124         Status = vfatUpdateFCB(DeviceExt, pFcb, &DirContext, pFcb->parentFcb);
 125         if (NT_SUCCESS(Status))
 126         {
 127             CcPurgeCacheSection(&pFcb->parentFcb->SectionObjectPointers, NULL, 0, FALSE);
 128         }
 129
 130         return Status;
 131     }
 132     else
 133     {
 134         /* This we cannot handle properly, move file - would likely need love */
 135         return VfatMoveEntry(DeviceExt, pFcb, FileName, pFcb->parentFcb);
 136     }
 137 }
 138
 139 /*
 140  * try to find contiguous entries frees in directory,
 141  * extend a directory if is neccesary
 142  */
 143 BOOLEAN
 144 vfatFindDirSpace(
 145     IN PDEVICE_EXTENSION DeviceExt,
 146     IN PVFATFCB pDirFcb,
 147     IN ULONG nbSlots,
 148     OUT PULONG start)
 149 {
 150     LARGE_INTEGER FileOffset;
 151     ULONG i, count, size, nbFree = 0;
 152     PDIR_ENTRY pFatEntry = NULL;
 153     PVOID Context = NULL;
 154     NTSTATUS Status;
 155     ULONG SizeDirEntry;
 156     FileOffset.QuadPart = 0;
 157
 158     if (DeviceExt->Flags & VCB_IS_FATX)
 159         SizeDirEntry = sizeof(FATX_DIR_ENTRY);
 160     else
 161         SizeDirEntry = sizeof(FAT_DIR_ENTRY);
 162
 163     count = pDirFcb->RFCB.FileSize.u.LowPart / SizeDirEntry;
 164     size = DeviceExt->FatInfo.BytesPerCluster / SizeDirEntry;
 165     for (i = 0; i < count; i++, pFatEntry = (PDIR_ENTRY)((ULONG_PTR)pFatEntry + SizeDirEntry))
 166     {
 167         if (Context == NULL || (i % size) == 0)
 168         {
 169             if (Context)
 170             {
 171                 CcUnpinData(Context);
 172             }
 173             if (!CcPinRead(pDirFcb->FileObject, &FileOffset, DeviceExt->FatInfo.BytesPerCluster,
 174                       TRUE, &Context, (PVOID*)&pFatEntry))
 175             {
 176                 return FALSE;
 177             }
 178             FileOffset.u.LowPart += DeviceExt->FatInfo.BytesPerCluster;
 179         }
 180         if (ENTRY_END(DeviceExt, pFatEntry))
 181         {
 182             break;
 183         }
 184         if (ENTRY_DELETED(DeviceExt, pFatEntry))
 185         {
 186             nbFree++;
 187         }
 188         else
 189         {
 190             nbFree = 0;
 191         }
 192         if (nbFree == nbSlots)
 193         {
 194             break;
 195         }
 196     }
 197     if (Context)
 198     {
 199         CcUnpinData(Context);
 200         Context = NULL;
 201     }
 202     if (nbFree == nbSlots)
 203     {
 204         /* found enough contiguous free slots */
 205         *start = i - nbSlots + 1;
 206     }
 207     else
 208     {
 209         *start = i - nbFree;
 210         if (*start + nbSlots > count)
 211         {
 212             LARGE_INTEGER AllocationSize;
 213             /* extend the directory */
 214             if (vfatFCBIsRoot(pDirFcb) && DeviceExt->FatInfo.FatType != FAT32)
 215             {
 216                 /* We can't extend a root directory on a FAT12/FAT16/FATX partition */
 217                 return FALSE;
 218             }
 219             AllocationSize.QuadPart = pDirFcb->RFCB.FileSize.u.LowPart + DeviceExt->FatInfo.BytesPerCluster;
 220             Status = VfatSetAllocationSizeInformation(pDirFcb->FileObject, pDirFcb,
 221                                                       DeviceExt, &AllocationSize);
 222             if (!NT_SUCCESS(Status))
 223             {
 224                 return FALSE;
 225             }
 226             /* clear the new dir cluster */
 227             FileOffset.u.LowPart = (ULONG)(pDirFcb->RFCB.FileSize.QuadPart -
 228                                            DeviceExt->FatInfo.BytesPerCluster);
 229             if (!CcPinRead(pDirFcb->FileObject, &FileOffset, DeviceExt->FatInfo.BytesPerCluster,
 230                       TRUE, &Context, (PVOID*)&pFatEntry))
 231             {
 232                 return FALSE;
 233             }
 234             if (DeviceExt->Flags & VCB_IS_FATX)
 235                 memset(pFatEntry, 0xff, DeviceExt->FatInfo.BytesPerCluster);
 236             else
 237                 RtlZeroMemory(pFatEntry, DeviceExt->FatInfo.BytesPerCluster);
 238         }
 239         else if (*start + nbSlots < count)
 240         {
 241             /* clear the entry after the last new entry */
 242             FileOffset.u.LowPart = (*start + nbSlots) * SizeDirEntry;
 243             if (!CcPinRead(pDirFcb->FileObject, &FileOffset, SizeDirEntry,
 244                 TRUE, &Context, (PVOID*)&pFatEntry))
 245             {
 246                 return FALSE;
 247             }
 248             if (DeviceExt->Flags & VCB_IS_FATX)
 249                 memset(pFatEntry, 0xff, SizeDirEntry);
 250             else
 251                 RtlZeroMemory(pFatEntry, SizeDirEntry);
 252         }
 253         if (Context)
 254         {
 255             CcSetDirtyPinnedData(Context, NULL);
 256             CcUnpinData(Context);
 257         }
 258     }
 259     DPRINT("nbSlots %u nbFree %u, entry number %u\n", nbSlots, nbFree, *start);
 260     return TRUE;
 261 }
 262
 263 /*
 264   create a new FAT entry
 265 */
 266 static NTSTATUS
 267 FATAddEntry(
 268     IN PDEVICE_EXTENSION DeviceExt,
 269     IN PUNICODE_STRING NameU,
 270     IN PVFATFCB* Fcb,
 271     IN PVFATFCB ParentFcb,
 272     IN ULONG RequestedOptions,
 273     IN UCHAR ReqAttr,
 274     IN PVFAT_MOVE_CONTEXT MoveContext)
 275 {
 276     PVOID Context = NULL;
 277     PFAT_DIR_ENTRY pFatEntry;
 278     slot *pSlots;
 279     USHORT nbSlots = 0, j, posCar;
 280     PUCHAR Buffer;
 281     BOOLEAN needTilde = FALSE, needLong = FALSE;
 282     BOOLEAN lCaseBase = FALSE, uCaseBase, lCaseExt = FALSE, uCaseExt;
 283     ULONG CurrentCluster;
 284     LARGE_INTEGER SystemTime, FileOffset;
 285     NTSTATUS Status = STATUS_SUCCESS;
 286     ULONG size;
 287     long i;
 288
 289     OEM_STRING NameA;
 290     CHAR aName[13];
 291     BOOLEAN IsNameLegal;
 292     BOOLEAN SpacesFound;
 293
 294     VFAT_DIRENTRY_CONTEXT DirContext;
 295     WCHAR LongNameBuffer[LONGNAME_MAX_LENGTH + 1];
 296     WCHAR ShortNameBuffer[13];
 297
 298     DPRINT("addEntry: Name='%wZ', Dir='%wZ'\n", NameU, &ParentFcb->PathNameU);
 299
 300     DirContext.LongNameU = *NameU;
 301
 302     /* nb of entry needed for long name+normal entry */
 303     nbSlots = (DirContext.LongNameU.Length / sizeof(WCHAR) + 12) / 13 + 1;
 304     DPRINT("NameLen= %u, nbSlots =%u\n", DirContext.LongNameU.Length / sizeof(WCHAR), nbSlots);
 305     Buffer = ExAllocatePoolWithTag(NonPagedPool, (nbSlots - 1) * sizeof(FAT_DIR_ENTRY), TAG_VFAT);
 306     if (Buffer == NULL)
 307     {
 308         return STATUS_INSUFFICIENT_RESOURCES;
 309     }
 310     RtlZeroMemory(Buffer, (nbSlots - 1) * sizeof(FAT_DIR_ENTRY));
 311     pSlots = (slot *) Buffer;
 312
 313     NameA.Buffer = aName;
 314     NameA.Length = 0;
 315     NameA.MaximumLength = sizeof(aName);
 316
 317     DirContext.ShortNameU.Buffer = ShortNameBuffer;
 318     DirContext.ShortNameU.Length = 0;
 319     DirContext.ShortNameU.MaximumLength = sizeof(ShortNameBuffer);
 320
 321     RtlZeroMemory(&DirContext.DirEntry.Fat, sizeof(FAT_DIR_ENTRY));
 322
 323     IsNameLegal = RtlIsNameLegalDOS8Dot3(&DirContext.LongNameU, &NameA, &SpacesFound);
 324
 325     if (!IsNameLegal || SpacesFound)
 326     {
 327         GENERATE_NAME_CONTEXT NameContext;
 328         VFAT_DIRENTRY_CONTEXT SearchContext;
 329         WCHAR ShortSearchName[13];
 330         needTilde = TRUE;
 331         needLong = TRUE;
 332         RtlZeroMemory(&NameContext, sizeof(GENERATE_NAME_CONTEXT));
 333         SearchContext.LongNameU.Buffer = LongNameBuffer;
 334         SearchContext.LongNameU.MaximumLength = sizeof(LongNameBuffer);
 335         SearchContext.ShortNameU.Buffer = ShortSearchName;
 336         SearchContext.ShortNameU.MaximumLength = sizeof(ShortSearchName);
 337
 338         for (i = 0; i < 100; i++)
 339         {
 340             RtlGenerate8dot3Name(&DirContext.LongNameU, FALSE, &NameContext, &DirContext.ShortNameU);
 341             DirContext.ShortNameU.Buffer[DirContext.ShortNameU.Length / sizeof(WCHAR)] = 0;
 342                                          SearchContext.DirIndex = 0;
 343             Status = FindFile(DeviceExt, ParentFcb, &DirContext.ShortNameU, &SearchContext, TRUE);
 344             if (!NT_SUCCESS(Status))
 345             {
 346                 break;
 347             }
 348         }
 349         if (i == 100) /* FIXME : what to do after this ? */
 350         {
 351             ExFreePoolWithTag(Buffer, TAG_VFAT);
 352             return STATUS_UNSUCCESSFUL;
 353         }
 354         IsNameLegal = RtlIsNameLegalDOS8Dot3(&DirContext.ShortNameU, &NameA, &SpacesFound);
 355         aName[NameA.Length]=0;
 356     }
 357     else
 358     {
 359         aName[NameA.Length] = 0;
 360         for (posCar = 0; posCar < DirContext.LongNameU.Length / sizeof(WCHAR); posCar++)
 361         {
 362             if (DirContext.LongNameU.Buffer[posCar] == L'.')
 363             {
 364                 break;
 365             }
 366         }
 367         /* check if the name and the extension contains upper case characters */
 368         RtlDowncaseUnicodeString(&DirContext.ShortNameU, &DirContext.LongNameU, FALSE);
 369         DirContext.ShortNameU.Buffer[DirContext.ShortNameU.Length / sizeof(WCHAR)] = 0;
 370         uCaseBase = wcsncmp(DirContext.LongNameU.Buffer,
 371                             DirContext.ShortNameU.Buffer, posCar) ? TRUE : FALSE;
 372         if (posCar < DirContext.LongNameU.Length/sizeof(WCHAR))
 373         {
 374             i = DirContext.LongNameU.Length / sizeof(WCHAR) - posCar;
 375             uCaseExt = wcsncmp(DirContext.LongNameU.Buffer + posCar,
 376                                DirContext.ShortNameU.Buffer + posCar, i) ? TRUE : FALSE;
 377         }
 378         else
 379         {
 380             uCaseExt = FALSE;
 381         }
 382         /* check if the name and the extension contains lower case characters */
 383         RtlUpcaseUnicodeString(&DirContext.ShortNameU, &DirContext.LongNameU, FALSE);
 384         DirContext.ShortNameU.Buffer[DirContext.ShortNameU.Length / sizeof(WCHAR)] = 0;
 385         lCaseBase = wcsncmp(DirContext.LongNameU.Buffer,
 386                             DirContext.ShortNameU.Buffer, posCar) ? TRUE : FALSE;
 387         if (posCar < DirContext.LongNameU.Length / sizeof(WCHAR))
 388         {
 389             i = DirContext.LongNameU.Length / sizeof(WCHAR) - posCar;
 390             lCaseExt = wcsncmp(DirContext.LongNameU.Buffer + posCar,
 391                                DirContext.ShortNameU.Buffer + posCar, i) ? TRUE : FALSE;
 392         }
 393         else
 394         {
 395             lCaseExt = FALSE;
 396         }
 397         if ((lCaseBase && uCaseBase) || (lCaseExt && uCaseExt))
 398         {
 399             needLong = TRUE;
 400         }
 401     }
 402     DPRINT("'%s', '%wZ', needTilde=%u, needLong=%u\n",
 403            aName, &DirContext.LongNameU, needTilde, needLong);
 404     memset(DirContext.DirEntry.Fat.ShortName, ' ', 11);
 405     for (i = 0; i < 8 && aName[i] && aName[i] != '.'; i++)
 406     {
 407         DirContext.DirEntry.Fat.Filename[i] = aName[i];
 408     }
 409     if (aName[i] == '.')
 410     {
 411         i++;
 412         for (j = 0; j < 3 && aName[i]; j++, i++)
 413         {
 414             DirContext.DirEntry.Fat.Ext[j] = aName[i];
 415         }
 416     }
 417     if (DirContext.DirEntry.Fat.Filename[0] == 0xe5)
 418     {
 419         DirContext.DirEntry.Fat.Filename[0] = 0x05;
 420     }
 421
 422     if (needLong)
 423     {
 424         RtlCopyMemory(LongNameBuffer, DirContext.LongNameU.Buffer, DirContext.LongNameU.Length);
 425         DirContext.LongNameU.Buffer = LongNameBuffer;
 426         DirContext.LongNameU.MaximumLength = sizeof(LongNameBuffer);
 427         DirContext.LongNameU.Buffer[DirContext.LongNameU.Length / sizeof(WCHAR)] = 0;
 428         memset(DirContext.LongNameU.Buffer + DirContext.LongNameU.Length / sizeof(WCHAR) + 1, 0xff,
 429                DirContext.LongNameU.MaximumLength - DirContext.LongNameU.Length - sizeof(WCHAR));
 430     }
 431     else
 432     {
 433         nbSlots = 1;
 434         if (lCaseBase)
 435         {
 436             DirContext.DirEntry.Fat.lCase |= VFAT_CASE_LOWER_BASE;
 437         }
 438         if (lCaseExt)
 439         {
 440             DirContext.DirEntry.Fat.lCase |= VFAT_CASE_LOWER_EXT;
 441         }
 442     }
 443
 444     DPRINT ("dos name=%11.11s\n", DirContext.DirEntry.Fat.Filename);
 445
 446     /* set attributes */
 447     DirContext.DirEntry.Fat.Attrib = ReqAttr;
 448     if (RequestedOptions & FILE_DIRECTORY_FILE)
 449     {
 450         DirContext.DirEntry.Fat.Attrib |= FILE_ATTRIBUTE_DIRECTORY;
 451     }
 452     /* set dates and times */
 453     KeQuerySystemTime(&SystemTime);
 454     FsdSystemTimeToDosDateTime(DeviceExt, &SystemTime, &DirContext.DirEntry.Fat.CreationDate,
 455                                &DirContext.DirEntry.Fat.CreationTime);
 456     DirContext.DirEntry.Fat.UpdateDate = DirContext.DirEntry.Fat.CreationDate;
 457     DirContext.DirEntry.Fat.UpdateTime = DirContext.DirEntry.Fat.CreationTime;
 458     DirContext.DirEntry.Fat.AccessDate = DirContext.DirEntry.Fat.CreationDate;
 459     /* If it's moving, preserve creation time and file size */
 460     if (MoveContext != NULL)
 461     {
 462         DirContext.DirEntry.Fat.CreationDate = MoveContext->CreationDate;
 463         DirContext.DirEntry.Fat.CreationTime = MoveContext->CreationTime;
 464         DirContext.DirEntry.Fat.FileSize = MoveContext->FileSize;
 465     }
 466
 467     if (needLong)
 468     {
 469         /* calculate checksum for 8.3 name */
 470         for (pSlots[0].alias_checksum = 0, i = 0; i < 11; i++)
 471         {
 472             pSlots[0].alias_checksum = (((pSlots[0].alias_checksum & 1) << 7
 473                                      | ((pSlots[0].alias_checksum & 0xfe) >> 1))
 474                                      + DirContext.DirEntry.Fat.ShortName[i]);
 475         }
 476         /* construct slots and entry */
 477         for (i = nbSlots - 2; i >= 0; i--)
 478         {
 479             DPRINT("construct slot %d\n", i);
 480             pSlots[i].attr = 0xf;
 481             if (i)
 482             {
 483                 pSlots[i].id = (unsigned char)(nbSlots - i - 1);
 484             }
 485             else
 486             {
 487                 pSlots[i].id = (unsigned char)(nbSlots - i - 1 + 0x40);
 488             }
 489             pSlots[i].alias_checksum = pSlots[0].alias_checksum;
 490             RtlCopyMemory(pSlots[i].name0_4, DirContext.LongNameU.Buffer + (nbSlots - i - 2) * 13, 10);
 491             RtlCopyMemory(pSlots[i].name5_10, DirContext.LongNameU.Buffer + (nbSlots - i - 2) * 13 + 5, 12);
 492             RtlCopyMemory(pSlots[i].name11_12, DirContext.LongNameU.Buffer + (nbSlots - i - 2) * 13 + 11, 4);
 493         }
 494     }
 495     /* try to find nbSlots contiguous entries frees in directory */
 496     if (!vfatFindDirSpace(DeviceExt, ParentFcb, nbSlots, &DirContext.StartIndex))
 497     {
 498         ExFreePoolWithTag(Buffer, TAG_VFAT);
 499         return STATUS_DISK_FULL;
 500     }
 501     DirContext.DirIndex = DirContext.StartIndex + nbSlots - 1;
 502     if (RequestedOptions & FILE_DIRECTORY_FILE)
 503     {
 504         /* If we aren't moving, use next */
 505         if (MoveContext == NULL)
 506         {
 507             CurrentCluster = 0;
 508             Status = NextCluster(DeviceExt, 0, &CurrentCluster, TRUE);
 509             if (CurrentCluster == 0xffffffff || !NT_SUCCESS(Status))
 510             {
 511                 ExFreePoolWithTag(Buffer, TAG_VFAT);
 512                 if (!NT_SUCCESS(Status))
 513                 {
 514                     return Status;
 515                 }
 516                 return STATUS_DISK_FULL;
 517             }
 518         }
 519         else
 520         {
 521             CurrentCluster = MoveContext->FirstCluster;
 522         }
 523
 524         if (DeviceExt->FatInfo.FatType == FAT32)
 525         {
 526             DirContext.DirEntry.Fat.FirstClusterHigh = (unsigned short)(CurrentCluster >> 16);
 527         }
 528         DirContext.DirEntry.Fat.FirstCluster = (unsigned short)CurrentCluster;
 529     }
 530     else if (MoveContext != NULL)
 531     {
 532         CurrentCluster = MoveContext->FirstCluster;
 533
 534         if (DeviceExt->FatInfo.FatType == FAT32)
 535         {
 536             DirContext.DirEntry.Fat.FirstClusterHigh = (unsigned short)(CurrentCluster >> 16);
 537         }
 538         DirContext.DirEntry.Fat.FirstCluster = (unsigned short)CurrentCluster;
 539     }
 540
 541     i = DeviceExt->FatInfo.BytesPerCluster / sizeof(FAT_DIR_ENTRY);
 542     FileOffset.u.HighPart = 0;
 543     FileOffset.u.LowPart = DirContext.StartIndex * sizeof(FAT_DIR_ENTRY);
 544     if (DirContext.StartIndex / i == DirContext.DirIndex / i)
 545     {
 546         /* one cluster */
 547         if (!CcPinRead(ParentFcb->FileObject, &FileOffset, nbSlots * sizeof(FAT_DIR_ENTRY),
 548                   TRUE, &Context, (PVOID*)&pFatEntry))
 549         {
 550             ExFreePoolWithTag(Buffer, TAG_VFAT);
 551             return STATUS_UNSUCCESSFUL;
 552         }
 553         if (nbSlots > 1)
 554         {
 555             RtlCopyMemory(pFatEntry, Buffer, (nbSlots - 1) * sizeof(FAT_DIR_ENTRY));
 556         }
 557         RtlCopyMemory(pFatEntry + (nbSlots - 1), &DirContext.DirEntry.Fat, sizeof(FAT_DIR_ENTRY));
 558     }
 559     else
 560     {
 561         /* two clusters */
 562         size = DeviceExt->FatInfo.BytesPerCluster -
 563                (DirContext.StartIndex * sizeof(FAT_DIR_ENTRY)) % DeviceExt->FatInfo.BytesPerCluster;
 564         i = size / sizeof(FAT_DIR_ENTRY);
 565         if (!CcPinRead(ParentFcb->FileObject, &FileOffset, size, TRUE,
 566                   &Context, (PVOID*)&pFatEntry))
 567         {
 568             ExFreePoolWithTag(Buffer, TAG_VFAT);
 569             return STATUS_UNSUCCESSFUL;
 570         }
 571         RtlCopyMemory(pFatEntry, Buffer, size);
 572         CcSetDirtyPinnedData(Context, NULL);
 573         CcUnpinData(Context);
 574         FileOffset.u.LowPart += size;
 575         if (!CcPinRead(ParentFcb->FileObject, &FileOffset,
 576                   nbSlots * sizeof(FAT_DIR_ENTRY) - size,
 577                   TRUE, &Context, (PVOID*)&pFatEntry))
 578         {
 579             ExFreePoolWithTag(Buffer, TAG_VFAT);
 580             return STATUS_UNSUCCESSFUL;
 581         }
 582         if (nbSlots - 1 > i)
 583         {
 584             RtlCopyMemory(pFatEntry, (PVOID)(Buffer + size), (nbSlots - 1 - i) * sizeof(FAT_DIR_ENTRY));
 585         }
 586         RtlCopyMemory(pFatEntry + nbSlots - 1 - i, &DirContext.DirEntry.Fat, sizeof(FAT_DIR_ENTRY));
 587     }
 588     CcSetDirtyPinnedData(Context, NULL);
 589     CcUnpinData(Context);
 590
 591     if (MoveContext != NULL)
 592     {
 593         /* We're modifying an existing FCB - likely rename/move */
 594         Status = vfatUpdateFCB(DeviceExt, *Fcb, &DirContext, ParentFcb);
 595         (*Fcb)->dirIndex = DirContext.DirIndex;
 596         (*Fcb)->startIndex = DirContext.StartIndex;
 597     }
 598     else
 599     {
 600         Status = vfatMakeFCBFromDirEntry(DeviceExt, ParentFcb, &DirContext, Fcb);
 601     }
 602     if (!NT_SUCCESS(Status))
 603     {
 604         ExFreePoolWithTag(Buffer, TAG_VFAT);
 605         return Status;
 606     }
 607
 608     DPRINT("new : entry=%11.11s\n", (*Fcb)->entry.Fat.Filename);
 609     DPRINT("new : entry=%11.11s\n", DirContext.DirEntry.Fat.Filename);
 610
 611     if (RequestedOptions & FILE_DIRECTORY_FILE)
 612     {
 613         FileOffset.QuadPart = 0;
 614         if (!CcPinRead((*Fcb)->FileObject, &FileOffset, DeviceExt->FatInfo.BytesPerCluster, TRUE,
 615                   &Context, (PVOID*)&pFatEntry))
 616         {
 617             ExFreePoolWithTag(Buffer, TAG_VFAT);
 618             return STATUS_UNSUCCESSFUL;
 619         }
 620         /* clear the new directory cluster if not moving */
 621         if (MoveContext == NULL)
 622         {
 623             RtlZeroMemory(pFatEntry, DeviceExt->FatInfo.BytesPerCluster);
 624             /* create '.' and '..' */
 625             RtlCopyMemory(&pFatEntry[0].Attrib, &DirContext.DirEntry.Fat.Attrib, sizeof(FAT_DIR_ENTRY) - 11);
 626             RtlCopyMemory(pFatEntry[0].ShortName, ".          ", 11);
 627             RtlCopyMemory(&pFatEntry[1].Attrib, &DirContext.DirEntry.Fat.Attrib, sizeof(FAT_DIR_ENTRY) - 11);
 628             RtlCopyMemory(pFatEntry[1].ShortName, "..         ", 11);
 629         }
 630
 631         pFatEntry[1].FirstCluster = ParentFcb->entry.Fat.FirstCluster;
 632         pFatEntry[1].FirstClusterHigh = ParentFcb->entry.Fat.FirstClusterHigh;
 633         if (vfatFCBIsRoot(ParentFcb))
 634         {
 635             pFatEntry[1].FirstCluster = 0;
 636             pFatEntry[1].FirstClusterHigh = 0;
 637         }
 638         CcSetDirtyPinnedData(Context, NULL);
 639         CcUnpinData(Context);
 640     }
 641     ExFreePoolWithTag(Buffer, TAG_VFAT);
 642     DPRINT("addentry ok\n");
 643     return STATUS_SUCCESS;
 644 }
 645
 646 /*
 647   create a new FAT entry
 648 */
 649 static NTSTATUS
 650 FATXAddEntry(
 651     IN PDEVICE_EXTENSION DeviceExt,
 652     IN PUNICODE_STRING NameU,
 653     IN PVFATFCB* Fcb,
 654     IN PVFATFCB ParentFcb,
 655     IN ULONG RequestedOptions,
 656     IN UCHAR ReqAttr,
 657     IN PVFAT_MOVE_CONTEXT MoveContext)
 658 {
 659     PVOID Context = NULL;
 660     LARGE_INTEGER SystemTime, FileOffset;
 661     OEM_STRING NameA;
 662     VFAT_DIRENTRY_CONTEXT DirContext;
 663     PFATX_DIR_ENTRY pFatXDirEntry;
 664     ULONG Index;
 665
 666     DPRINT("addEntry: Name='%wZ', Dir='%wZ'\n", NameU, &ParentFcb->PathNameU);
 667
 668     DirContext.LongNameU = *NameU;
 669
 670     if (DirContext.LongNameU.Length / sizeof(WCHAR) > 42)
 671     {
 672         /* name too long */
 673         return STATUS_NAME_TOO_LONG;
 674     }
 675
 676     /* try to find 1 entry free in directory */
 677     if (!vfatFindDirSpace(DeviceExt, ParentFcb, 1, &DirContext.StartIndex))
 678     {
 679         return STATUS_DISK_FULL;
 680     }
 681     Index = DirContext.DirIndex = DirContext.StartIndex;
 682     if (!vfatFCBIsRoot(ParentFcb))
 683     {
 684         DirContext.DirIndex += 2;
 685         DirContext.StartIndex += 2;
 686     }
 687
 688     DirContext.ShortNameU.Buffer = 0;
 689     DirContext.ShortNameU.Length = 0;
 690     DirContext.ShortNameU.MaximumLength = 0;
 691     RtlZeroMemory(&DirContext.DirEntry.FatX, sizeof(FATX_DIR_ENTRY));
 692     memset(DirContext.DirEntry.FatX.Filename, 0xff, 42);
 693     /* Use cluster, if moving */
 694     if (MoveContext != NULL)
 695     {
 696         DirContext.DirEntry.FatX.FirstCluster = MoveContext->FirstCluster;
 697     }
 698     else
 699     {
 700         DirContext.DirEntry.FatX.FirstCluster = 0;
 701     }
 702     DirContext.DirEntry.FatX.FileSize = 0;
 703
 704     /* set file name */
 705     NameA.Buffer = (PCHAR)DirContext.DirEntry.FatX.Filename;
 706     NameA.Length = 0;
 707     NameA.MaximumLength = 42;
 708     RtlUnicodeStringToOemString(&NameA, &DirContext.LongNameU, FALSE);
 709     DirContext.DirEntry.FatX.FilenameLength = (unsigned char)NameA.Length;
 710
 711     /* set attributes */
 712     DirContext.DirEntry.FatX.Attrib = ReqAttr;
 713     if (RequestedOptions & FILE_DIRECTORY_FILE)
 714     {
 715         DirContext.DirEntry.FatX.Attrib |= FILE_ATTRIBUTE_DIRECTORY;
 716     }
 717
 718     /* set dates and times */
 719     KeQuerySystemTime(&SystemTime);
 720     FsdSystemTimeToDosDateTime(DeviceExt, &SystemTime, &DirContext.DirEntry.FatX.CreationDate,
 721                                &DirContext.DirEntry.FatX.CreationTime);
 722     DirContext.DirEntry.FatX.UpdateDate = DirContext.DirEntry.FatX.CreationDate;
 723     DirContext.DirEntry.FatX.UpdateTime = DirContext.DirEntry.FatX.CreationTime;
 724     DirContext.DirEntry.FatX.AccessDate = DirContext.DirEntry.FatX.CreationDate;
 725     DirContext.DirEntry.FatX.AccessTime = DirContext.DirEntry.FatX.CreationTime;
 726     /* If it's moving, preserve creation time and file size */
 727     if (MoveContext != NULL)
 728     {
 729         DirContext.DirEntry.FatX.CreationDate = MoveContext->CreationDate;
 730         DirContext.DirEntry.FatX.CreationTime = MoveContext->CreationTime;
 731         DirContext.DirEntry.FatX.FileSize = MoveContext->FileSize;
 732     }
 733
 734     /* add entry into parent directory */
 735     FileOffset.u.HighPart = 0;
 736     FileOffset.u.LowPart = Index * sizeof(FATX_DIR_ENTRY);
 737     if (!CcPinRead(ParentFcb->FileObject, &FileOffset, sizeof(FATX_DIR_ENTRY),
 738               TRUE, &Context, (PVOID*)&pFatXDirEntry))
 739     {
 740         return STATUS_UNSUCCESSFUL;
 741     }
 742     RtlCopyMemory(pFatXDirEntry, &DirContext.DirEntry.FatX, sizeof(FATX_DIR_ENTRY));
 743     CcSetDirtyPinnedData(Context, NULL);
 744     CcUnpinData(Context);
 745
 746     if (MoveContext != NULL)
 747     {
 748         /* We're modifying an existing FCB - likely rename/move */
 749         /* FIXME: check status */
 750         vfatUpdateFCB(DeviceExt, *Fcb, &DirContext, ParentFcb);
 751         (*Fcb)->dirIndex = DirContext.DirIndex;
 752         (*Fcb)->startIndex = DirContext.StartIndex;
 753     }
 754     else
 755     {
 756         /* FIXME: check status */
 757         vfatMakeFCBFromDirEntry(DeviceExt, ParentFcb, &DirContext, Fcb);
 758     }
 759
 760     DPRINT("addentry ok\n");
 761     return STATUS_SUCCESS;
 762 }
 763
 764 NTSTATUS
 765 VfatAddEntry(
 766     IN PDEVICE_EXTENSION DeviceExt,
 767     IN PUNICODE_STRING NameU,
 768     IN PVFATFCB *Fcb,
 769     IN PVFATFCB ParentFcb,
 770     IN ULONG RequestedOptions,
 771     IN UCHAR ReqAttr,
 772     IN PVFAT_MOVE_CONTEXT MoveContext)
 773 {
 774     if (DeviceExt->Flags & VCB_IS_FATX)
 775         return FATXAddEntry(DeviceExt, NameU, Fcb, ParentFcb, RequestedOptions, ReqAttr, MoveContext);
 776     else
 777         return FATAddEntry(DeviceExt, NameU, Fcb, ParentFcb, RequestedOptions, ReqAttr, MoveContext);
 778 }
 779
 780 /*
 781  * deleting an existing FAT entry
 782  */
 783 static NTSTATUS
 784 FATDelEntry(
 785     IN PDEVICE_EXTENSION DeviceExt,
 786     IN PVFATFCB pFcb,
 787     OUT PVFAT_MOVE_CONTEXT MoveContext)
 788 {
 789     ULONG CurrentCluster = 0, NextCluster, i;
 790     PVOID Context = NULL;
 791     LARGE_INTEGER Offset;
 792     PFAT_DIR_ENTRY pDirEntry = NULL;
 793
 794     ASSERT(pFcb);
 795     ASSERT(pFcb->parentFcb);
 796
 797     DPRINT("delEntry PathName \'%wZ\'\n", &pFcb->PathNameU);
 798     DPRINT("delete entry: %u to %u\n", pFcb->startIndex, pFcb->dirIndex);
 799     Offset.u.HighPart = 0;
 800     for (i = pFcb->startIndex; i <= pFcb->dirIndex; i++)
 801     {
 802         if (Context == NULL || ((i * sizeof(FAT_DIR_ENTRY)) % PAGE_SIZE) == 0)
 803         {
 804             if (Context)
 805             {
 806                 CcSetDirtyPinnedData(Context, NULL);
 807                 CcUnpinData(Context);
 808             }
 809             Offset.u.LowPart = (i * sizeof(FAT_DIR_ENTRY) / PAGE_SIZE) * PAGE_SIZE;
 810             if (!CcPinRead(pFcb->parentFcb->FileObject, &Offset, sizeof(FAT_DIR_ENTRY), TRUE,
 811                       &Context, (PVOID*)&pDirEntry))
 812             {
 813                 return STATUS_UNSUCCESSFUL;
 814             }
 815         }
 816         pDirEntry[i % (PAGE_SIZE / sizeof(FAT_DIR_ENTRY))].Filename[0] = 0xe5;
 817         if (i == pFcb->dirIndex)
 818         {
 819             CurrentCluster =
 820             vfatDirEntryGetFirstCluster(DeviceExt,
 821                                         (PDIR_ENTRY)&pDirEntry[i % (PAGE_SIZE / sizeof(FAT_DIR_ENTRY))]);
 822         }
 823     }
 824     if (Context)
 825     {
 826         CcSetDirtyPinnedData(Context, NULL);
 827         CcUnpinData(Context);
 828     }
 829
 830     /* In case of moving, don't delete data */
 831     if (MoveContext != NULL)
 832     {
 833         pDirEntry = &pDirEntry[pFcb->dirIndex % (PAGE_SIZE / sizeof(FAT_DIR_ENTRY))];
 834         MoveContext->FirstCluster = CurrentCluster;
 835         MoveContext->FileSize = pDirEntry->FileSize;
 836         MoveContext->CreationTime = pDirEntry->CreationTime;
 837         MoveContext->CreationDate = pDirEntry->CreationDate;
 838     }
 839     else
 840     {
 841         while (CurrentCluster && CurrentCluster != 0xffffffff)
 842         {
 843             GetNextCluster(DeviceExt, CurrentCluster, &NextCluster);
 844             /* FIXME: check status */
 845             WriteCluster(DeviceExt, CurrentCluster, 0);
 846             CurrentCluster = NextCluster;
 847         }
 848     }
 849
 850     return STATUS_SUCCESS;
 851 }
 852
 853 /*
 854  * deleting an existing FAT entry
 855  */
 856 static NTSTATUS
 857 FATXDelEntry(
 858     IN PDEVICE_EXTENSION DeviceExt,
 859     IN PVFATFCB pFcb,
 860     OUT PVFAT_MOVE_CONTEXT MoveContext)
 861 {
 862     ULONG CurrentCluster = 0, NextCluster;
 863     PVOID Context = NULL;
 864     LARGE_INTEGER Offset;
 865     PFATX_DIR_ENTRY pDirEntry;
 866     ULONG StartIndex;
 867
 868     ASSERT(pFcb);
 869     ASSERT(pFcb->parentFcb);
 870     ASSERT(pFcb->Flags & FCB_IS_FATX_ENTRY);
 871
 872     StartIndex = pFcb->startIndex;
 873
 874     DPRINT("delEntry PathName \'%wZ\'\n", &pFcb->PathNameU);
 875     DPRINT("delete entry: %u\n", StartIndex);
 876     Offset.u.HighPart = 0;
 877     Offset.u.LowPart = (StartIndex * sizeof(FATX_DIR_ENTRY) / PAGE_SIZE) * PAGE_SIZE;
 878     if (!CcPinRead(pFcb->parentFcb->FileObject, &Offset, sizeof(FATX_DIR_ENTRY), TRUE,
 879                    &Context, (PVOID*)&pDirEntry))
 880     {
 881         DPRINT1("CcPinRead(Offset %x:%x, Length %d) failed\n", Offset.u.HighPart, Offset.u.LowPart, PAGE_SIZE);
 882         return STATUS_UNSUCCESSFUL;
 883     }
 884     pDirEntry = &pDirEntry[StartIndex % (PAGE_SIZE / sizeof(FATX_DIR_ENTRY))];
 885     pDirEntry->FilenameLength = 0xe5;
 886     CurrentCluster = vfatDirEntryGetFirstCluster(DeviceExt,
 887                                                  (PDIR_ENTRY)pDirEntry);
 888     CcSetDirtyPinnedData(Context, NULL);
 889     CcUnpinData(Context);
 890
 891     /* In case of moving, don't delete data */
 892     if (MoveContext != NULL)
 893     {
 894         MoveContext->FirstCluster = CurrentCluster;
 895         MoveContext->FileSize = pDirEntry->FileSize;
 896         MoveContext->CreationTime = pDirEntry->CreationTime;
 897         MoveContext->CreationDate = pDirEntry->CreationDate;
 898     }
 899     else
 900     {
 901         while (CurrentCluster && CurrentCluster != 0xffffffff)
 902         {
 903             GetNextCluster(DeviceExt, CurrentCluster, &NextCluster);
 904             /* FIXME: check status */
 905             WriteCluster(DeviceExt, CurrentCluster, 0);
 906             CurrentCluster = NextCluster;
 907         }
 908     }
 909
 910     return STATUS_SUCCESS;
 911 }
 912
 913 NTSTATUS
 914 VfatDelEntry(
 915     IN PDEVICE_EXTENSION DeviceExt,
 916     IN PVFATFCB pFcb,
 917     OUT PVFAT_MOVE_CONTEXT MoveContext)
 918 {
 919     if (DeviceExt->Flags & VCB_IS_FATX)
 920         return FATXDelEntry(DeviceExt, pFcb, MoveContext);
 921     else
 922         return FATDelEntry(DeviceExt, pFcb, MoveContext);
 923 }
 924
 925 /*
 926  * move an existing FAT entry
 927  */
 928 NTSTATUS
 929 VfatMoveEntry(
 930     IN PDEVICE_EXTENSION DeviceExt,
 931     IN PVFATFCB pFcb,
 932     IN PUNICODE_STRING FileName,
 933     IN PVFATFCB ParentFcb)
 934 {
 935     NTSTATUS Status;
 936     PVFATFCB OldParent;
 937     VFAT_MOVE_CONTEXT MoveContext;
 938
 939     DPRINT("VfatMoveEntry(%p, %p, %wZ, %p)\n", DeviceExt, pFcb, FileName, ParentFcb);
 940
 941     /* Delete old entry while keeping data */
 942     Status = VfatDelEntry(DeviceExt, pFcb, &MoveContext);
 943     if (!NT_SUCCESS(Status))
 944     {
 945         return Status;
 946     }
 947
 948     OldParent = pFcb->parentFcb;
 949     CcPurgeCacheSection(&OldParent->SectionObjectPointers, NULL, 0, FALSE);
 950
 951     /* Add our new entry with our cluster */
 952     Status = VfatAddEntry(DeviceExt,
 953                           FileName,
 954                           &pFcb,
 955                           ParentFcb,
 956                           (vfatFCBIsDirectory(pFcb) ? FILE_DIRECTORY_FILE : 0),
 957                           *pFcb->Attributes,
 958                           &MoveContext);
 959
 960     CcPurgeCacheSection(&pFcb->parentFcb->SectionObjectPointers, NULL, 0, FALSE);
 961
 962     return Status;
 963 }
 964
 965 /* EOF */