reactos/drivers/filesystems/fastfat/fsctl.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 along
  16  *  with this program; if not, write to the Free Software Foundation, Inc.,
  17  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19 /*
  20  * COPYRIGHT:        See COPYING in the top level directory
  21  * PROJECT:          ReactOS kernel
  22  * FILE:             drivers/fs/vfat/fsctl.c
  23  * PURPOSE:          VFAT Filesystem
  24  */
  25
  26 /* INCLUDES *****************************************************************/
  27
  28 #include "vfat.h"
  29
  30 #define NDEBUG
  31 #include <debug.h>
  32
  33 /* FUNCTIONS ****************************************************************/
  34
  35 #define  CACHEPAGESIZE(pDeviceExt) ((pDeviceExt)->FatInfo.BytesPerCluster > PAGE_SIZE ? \
  36                                     (pDeviceExt)->FatInfo.BytesPerCluster : PAGE_SIZE)
  37
  38 static
  39 NTSTATUS
  40 VfatHasFileSystem(
  41     PDEVICE_OBJECT DeviceToMount,
  42     PBOOLEAN RecognizedFS,
  43     PFATINFO pFatInfo,
  44     BOOLEAN Override)
  45 {
  46     NTSTATUS Status;
  47     PARTITION_INFORMATION PartitionInfo;
  48     DISK_GEOMETRY DiskGeometry;
  49     FATINFO FatInfo;
  50     ULONG Size;
  51     ULONG Sectors;
  52     LARGE_INTEGER Offset;
  53     struct _BootSector* Boot;
  54     struct _BootSectorFatX* BootFatX;
  55     BOOLEAN PartitionInfoIsValid = FALSE;
  56
  57     DPRINT("VfatHasFileSystem\n");
  58
  59     *RecognizedFS = FALSE;
  60
  61     Size = sizeof(DISK_GEOMETRY);
  62     Status = VfatBlockDeviceIoControl(DeviceToMount,
  63                                       IOCTL_DISK_GET_DRIVE_GEOMETRY,
  64                                       NULL,
  65                                       0,
  66                                       &DiskGeometry,
  67                                       &Size,
  68                                       Override);
  69     if (!NT_SUCCESS(Status))
  70     {
  71         DPRINT("VfatBlockDeviceIoControl failed (%x)\n", Status);
  72         return Status;
  73     }
  74
  75     FatInfo.FixedMedia = DiskGeometry.MediaType == FixedMedia ? TRUE : FALSE;
  76     if (DiskGeometry.MediaType == FixedMedia || DiskGeometry.MediaType == RemovableMedia)
  77     {
  78         // We have found a hard disk
  79         Size = sizeof(PARTITION_INFORMATION);
  80         Status = VfatBlockDeviceIoControl(DeviceToMount,
  81                                           IOCTL_DISK_GET_PARTITION_INFO,
  82                                           NULL,
  83                                           0,
  84                                           &PartitionInfo,
  85                                           &Size,
  86                                           Override);
  87         if (!NT_SUCCESS(Status))
  88         {
  89             DPRINT("VfatBlockDeviceIoControl failed (%x)\n", Status);
  90             return Status;
  91         }
  92
  93         DPRINT("Partition Information:\n");
  94         DPRINT("StartingOffset      %I64x\n", PartitionInfo.StartingOffset.QuadPart  / 512);
  95         DPRINT("PartitionLength     %I64x\n", PartitionInfo.PartitionLength.QuadPart / 512);
  96         DPRINT("HiddenSectors       %u\n", PartitionInfo.HiddenSectors);
  97         DPRINT("PartitionNumber     %u\n", PartitionInfo.PartitionNumber);
  98         DPRINT("PartitionType       %u\n", PartitionInfo.PartitionType);
  99         DPRINT("BootIndicator       %u\n", PartitionInfo.BootIndicator);
 100         DPRINT("RecognizedPartition %u\n", PartitionInfo.RecognizedPartition);
 101         DPRINT("RewritePartition    %u\n", PartitionInfo.RewritePartition);
 102         if (PartitionInfo.PartitionType)
 103         {
 104             if (PartitionInfo.PartitionType == PARTITION_FAT_12       ||
 105                 PartitionInfo.PartitionType == PARTITION_FAT_16       ||
 106                 PartitionInfo.PartitionType == PARTITION_HUGE         ||
 107                 PartitionInfo.PartitionType == PARTITION_FAT32        ||
 108                 PartitionInfo.PartitionType == PARTITION_FAT32_XINT13 ||
 109                 PartitionInfo.PartitionType == PARTITION_XINT13)
 110             {
 111                  PartitionInfoIsValid = TRUE;
 112                 *RecognizedFS = TRUE;
 113             }
 114         }
 115         else if (DiskGeometry.MediaType == RemovableMedia &&
 116                  PartitionInfo.PartitionNumber > 0 &&
 117                  PartitionInfo.StartingOffset.QuadPart == 0 &&
 118                  PartitionInfo.PartitionLength.QuadPart > 0)
 119         {
 120             /* This is possible a removable media formated as super floppy */
 121             PartitionInfoIsValid = TRUE;
 122             *RecognizedFS = TRUE;
 123         }
 124     }
 125     else
 126     {
 127         *RecognizedFS = TRUE;
 128     }
 129
 130     if (*RecognizedFS)
 131     {
 132         Boot = ExAllocatePoolWithTag(NonPagedPool, DiskGeometry.BytesPerSector, TAG_VFAT);
 133         if (Boot == NULL)
 134         {
 135            return STATUS_INSUFFICIENT_RESOURCES;
 136         }
 137
 138         Offset.QuadPart = 0;
 139
 140         /* Try to recognize FAT12/FAT16/FAT32 partitions */
 141         Status = VfatReadDisk(DeviceToMount, &Offset, DiskGeometry.BytesPerSector, (PUCHAR) Boot, Override);
 142         if (NT_SUCCESS(Status))
 143         {
 144             if (Boot->Signatur1 != 0xaa55)
 145             {
 146                 *RecognizedFS = FALSE;
 147             }
 148
 149             if (*RecognizedFS &&
 150                 Boot->BytesPerSector != 512 &&
 151                 Boot->BytesPerSector != 1024 &&
 152                 Boot->BytesPerSector != 2048 &&
 153                 Boot->BytesPerSector != 4096)
 154             {
 155                 DPRINT1("BytesPerSector %u\n", Boot->BytesPerSector);
 156                 *RecognizedFS = FALSE;
 157             }
 158
 159             if (*RecognizedFS &&
 160                 Boot->FATCount != 1 &&
 161                 Boot->FATCount != 2)
 162             {
 163                 DPRINT1("FATCount %u\n", Boot->FATCount);
 164                 *RecognizedFS = FALSE;
 165             }
 166
 167             if (*RecognizedFS &&
 168                 Boot->Media != 0xf0 &&
 169                 Boot->Media != 0xf8 &&
 170                 Boot->Media != 0xf9 &&
 171                 Boot->Media != 0xfa &&
 172                 Boot->Media != 0xfb &&
 173                 Boot->Media != 0xfc &&
 174                 Boot->Media != 0xfd &&
 175                 Boot->Media != 0xfe &&
 176                 Boot->Media != 0xff)
 177             {
 178                 DPRINT1("Media             %02x\n", Boot->Media);
 179                 *RecognizedFS = FALSE;
 180             }
 181
 182             if (*RecognizedFS &&
 183                 Boot->SectorsPerCluster != 1 &&
 184                 Boot->SectorsPerCluster != 2 &&
 185                 Boot->SectorsPerCluster != 4 &&
 186                 Boot->SectorsPerCluster != 8 &&
 187                 Boot->SectorsPerCluster != 16 &&
 188                 Boot->SectorsPerCluster != 32 &&
 189                 Boot->SectorsPerCluster != 64 &&
 190                 Boot->SectorsPerCluster != 128)
 191             {
 192                 DPRINT1("SectorsPerCluster %02x\n", Boot->SectorsPerCluster);
 193                 *RecognizedFS = FALSE;
 194             }
 195
 196             if (*RecognizedFS &&
 197                 Boot->BytesPerSector * Boot->SectorsPerCluster > 32 * 1024)
 198             {
 199                 DPRINT1("ClusterSize %dx\n", Boot->BytesPerSector * Boot->SectorsPerCluster);
 200                 *RecognizedFS = FALSE;
 201             }
 202
 203             if (*RecognizedFS)
 204             {
 205                 FatInfo.VolumeID = Boot->VolumeID;
 206                 FatInfo.FATStart = Boot->ReservedSectors;
 207                 FatInfo.FATCount = Boot->FATCount;
 208                 FatInfo.FATSectors = Boot->FATSectors ? Boot->FATSectors : ((struct _BootSector32*) Boot)->FATSectors32;
 209                 FatInfo.BytesPerSector = Boot->BytesPerSector;
 210                 FatInfo.SectorsPerCluster = Boot->SectorsPerCluster;
 211                 FatInfo.BytesPerCluster = FatInfo.BytesPerSector * FatInfo.SectorsPerCluster;
 212                 FatInfo.rootDirectorySectors = ((Boot->RootEntries * 32) + Boot->BytesPerSector - 1) / Boot->BytesPerSector;
 213                 FatInfo.rootStart = FatInfo.FATStart + FatInfo.FATCount * FatInfo.FATSectors;
 214                 FatInfo.dataStart = FatInfo.rootStart + FatInfo.rootDirectorySectors;
 215                 FatInfo.Sectors = Sectors = Boot->Sectors ? Boot->Sectors : Boot->SectorsHuge;
 216                 Sectors -= Boot->ReservedSectors + FatInfo.FATCount * FatInfo.FATSectors + FatInfo.rootDirectorySectors;
 217                 FatInfo.NumberOfClusters = Sectors / Boot->SectorsPerCluster;
 218                 if (FatInfo.NumberOfClusters < 4085)
 219                 {
 220                     DPRINT("FAT12\n");
 221                     FatInfo.FatType = FAT12;
 222                     FatInfo.RootCluster = (FatInfo.rootStart - 1) / FatInfo.SectorsPerCluster;
 223                     RtlCopyMemory(&FatInfo.VolumeLabel, &Boot->VolumeLabel, sizeof(FatInfo.VolumeLabel));
 224                 }
 225                 else if (FatInfo.NumberOfClusters >= 65525)
 226                 {
 227                     DPRINT("FAT32\n");
 228                     FatInfo.FatType = FAT32;
 229                     FatInfo.RootCluster = ((struct _BootSector32*) Boot)->RootCluster;
 230                     FatInfo.rootStart = FatInfo.dataStart + ((FatInfo.RootCluster - 2) * FatInfo.SectorsPerCluster);
 231                     FatInfo.VolumeID = ((struct _BootSector32*) Boot)->VolumeID;
 232                     RtlCopyMemory(&FatInfo.VolumeLabel, &((struct _BootSector32*)Boot)->VolumeLabel, sizeof(FatInfo.VolumeLabel));
 233                 }
 234                 else
 235                 {
 236                     DPRINT("FAT16\n");
 237                     FatInfo.FatType = FAT16;
 238                     FatInfo.RootCluster = FatInfo.rootStart / FatInfo.SectorsPerCluster;
 239                     RtlCopyMemory(&FatInfo.VolumeLabel, &Boot->VolumeLabel, sizeof(FatInfo.VolumeLabel));
 240                 }
 241
 242                 if (PartitionInfoIsValid &&
 243                     FatInfo.Sectors > PartitionInfo.PartitionLength.QuadPart / FatInfo.BytesPerSector)
 244                 {
 245                     *RecognizedFS = FALSE;
 246                 }
 247
 248                 if (pFatInfo && *RecognizedFS)
 249                 {
 250                     *pFatInfo = FatInfo;
 251                 }
 252             }
 253         }
 254
 255         ExFreePool(Boot);
 256     }
 257
 258     if (!*RecognizedFS && PartitionInfoIsValid)
 259     {
 260         BootFatX = ExAllocatePoolWithTag(NonPagedPool, sizeof(struct _BootSectorFatX), TAG_VFAT);
 261         if (BootFatX == NULL)
 262         {
 263             *RecognizedFS=FALSE;
 264             return STATUS_INSUFFICIENT_RESOURCES;
 265         }
 266
 267         Offset.QuadPart = 0;
 268
 269         /* Try to recognize FATX16/FATX32 partitions (Xbox) */
 270         Status = VfatReadDisk(DeviceToMount, &Offset, sizeof(struct _BootSectorFatX), (PUCHAR) BootFatX, Override);
 271         if (NT_SUCCESS(Status))
 272         {
 273             *RecognizedFS = TRUE;
 274             if (BootFatX->SysType[0] != 'F' ||
 275                 BootFatX->SysType[1] != 'A' ||
 276                 BootFatX->SysType[2] != 'T' ||
 277                 BootFatX->SysType[3] != 'X')
 278             {
 279                 DPRINT1("SysType %c%c%c%c\n", BootFatX->SysType[0], BootFatX->SysType[1], BootFatX->SysType[2], BootFatX->SysType[3]);
 280                 *RecognizedFS=FALSE;
 281             }
 282
 283             if (*RecognizedFS &&
 284                 BootFatX->SectorsPerCluster != 1 &&
 285                 BootFatX->SectorsPerCluster != 2 &&
 286                 BootFatX->SectorsPerCluster != 4 &&
 287                 BootFatX->SectorsPerCluster != 8 &&
 288                 BootFatX->SectorsPerCluster != 16 &&
 289                 BootFatX->SectorsPerCluster != 32 &&
 290                 BootFatX->SectorsPerCluster != 64 &&
 291                 BootFatX->SectorsPerCluster != 128)
 292             {
 293                 DPRINT1("SectorsPerCluster %lu\n", BootFatX->SectorsPerCluster);
 294                 *RecognizedFS=FALSE;
 295             }
 296
 297             if (*RecognizedFS)
 298             {
 299                 FatInfo.BytesPerSector = DiskGeometry.BytesPerSector;
 300                 FatInfo.SectorsPerCluster = BootFatX->SectorsPerCluster;
 301                 FatInfo.rootDirectorySectors = BootFatX->SectorsPerCluster;
 302                 FatInfo.BytesPerCluster = BootFatX->SectorsPerCluster * DiskGeometry.BytesPerSector;
 303                 FatInfo.Sectors = (ULONG)(PartitionInfo.PartitionLength.QuadPart / DiskGeometry.BytesPerSector);
 304                 if (FatInfo.Sectors / FatInfo.SectorsPerCluster < 65525)
 305                 {
 306                     DPRINT("FATX16\n");
 307                     FatInfo.FatType = FATX16;
 308                 }
 309                 else
 310                 {
 311                     DPRINT("FATX32\n");
 312                     FatInfo.FatType = FATX32;
 313                 }
 314                 FatInfo.VolumeID = BootFatX->VolumeID;
 315                 FatInfo.FATStart = sizeof(struct _BootSectorFatX) / DiskGeometry.BytesPerSector;
 316                 FatInfo.FATCount = BootFatX->FATCount;
 317                 FatInfo.FATSectors =
 318                     ROUND_UP(FatInfo.Sectors / FatInfo.SectorsPerCluster * (FatInfo.FatType == FATX16 ? 2 : 4), 4096) /
 319                     FatInfo.BytesPerSector;
 320                 FatInfo.rootStart = FatInfo.FATStart + FatInfo.FATCount * FatInfo.FATSectors;
 321                 FatInfo.RootCluster = (FatInfo.rootStart - 1) / FatInfo.SectorsPerCluster;
 322                 FatInfo.dataStart = FatInfo.rootStart + FatInfo.rootDirectorySectors;
 323                 FatInfo.NumberOfClusters = (FatInfo.Sectors - FatInfo.dataStart) / FatInfo.SectorsPerCluster;
 324
 325                 if (pFatInfo && *RecognizedFS)
 326                 {
 327                     *pFatInfo = FatInfo;
 328                 }
 329             }
 330         }
 331         ExFreePool(BootFatX);
 332     }
 333
 334     DPRINT("VfatHasFileSystem done\n");
 335     return Status;
 336 }
 337
 338
 339 /*
 340  * FUNCTION: Mount the filesystem
 341  */
 342 static
 343 NTSTATUS
 344 VfatMount(
 345     PVFAT_IRP_CONTEXT IrpContext)
 346 {
 347     PDEVICE_OBJECT DeviceObject = NULL;
 348     PDEVICE_EXTENSION DeviceExt = NULL;
 349     BOOLEAN RecognizedFS;
 350     NTSTATUS Status;
 351     PVFATFCB Fcb = NULL;
 352     PVFATFCB VolumeFcb = NULL;
 353     PVFATCCB Ccb = NULL;
 354     PDEVICE_OBJECT DeviceToMount;
 355     PVPB Vpb;
 356     UNICODE_STRING NameU = RTL_CONSTANT_STRING(L"\\$$Fat$$");
 357     UNICODE_STRING VolumeNameU = RTL_CONSTANT_STRING(L"\\$$Volume$$");
 358     ULONG HashTableSize;
 359     ULONG eocMark;
 360     FATINFO FatInfo;
 361
 362     DPRINT("VfatMount(IrpContext %p)\n", IrpContext);
 363
 364     ASSERT(IrpContext);
 365
 366     if (IrpContext->DeviceObject != VfatGlobalData->DeviceObject)
 367     {
 368         Status = STATUS_INVALID_DEVICE_REQUEST;
 369         goto ByeBye;
 370     }
 371
 372     DeviceToMount = IrpContext->Stack->Parameters.MountVolume.DeviceObject;
 373     Vpb = IrpContext->Stack->Parameters.MountVolume.Vpb;
 374
 375     Status = VfatHasFileSystem(DeviceToMount, &RecognizedFS, &FatInfo, FALSE);
 376     if (!NT_SUCCESS(Status))
 377     {
 378         goto ByeBye;
 379     }
 380
 381     if (RecognizedFS == FALSE)
 382     {
 383         DPRINT("VFAT: Unrecognized Volume\n");
 384         Status = STATUS_UNRECOGNIZED_VOLUME;
 385         goto ByeBye;
 386     }
 387
 388     /* Use prime numbers for the table size */
 389     if (FatInfo.FatType == FAT12)
 390     {
 391         HashTableSize = 4099; // 4096 = 4 * 1024
 392     }
 393     else if (FatInfo.FatType == FAT16 ||
 394              FatInfo.FatType == FATX16)
 395     {
 396         HashTableSize = 16411; // 16384 = 16 * 1024
 397     }
 398     else
 399     {
 400         HashTableSize = 65537; // 65536 = 64 * 1024;
 401     }
 402     DPRINT("VFAT: Recognized volume\n");
 403     Status = IoCreateDevice(VfatGlobalData->DriverObject,
 404                             ROUND_UP(sizeof (DEVICE_EXTENSION), sizeof(ULONG)) + sizeof(HASHENTRY*) * HashTableSize,
 405                             NULL,
 406                             FILE_DEVICE_DISK_FILE_SYSTEM,
 407                             DeviceToMount->Characteristics,
 408                             FALSE,
 409                             &DeviceObject);
 410     if (!NT_SUCCESS(Status))
 411     {
 412         goto ByeBye;
 413     }
 414
 415     DeviceExt = DeviceObject->DeviceExtension;
 416     RtlZeroMemory(DeviceExt, ROUND_UP(sizeof(DEVICE_EXTENSION), sizeof(ULONG)) + sizeof(HASHENTRY*) * HashTableSize);
 417     DeviceExt->FcbHashTable = (HASHENTRY**)((ULONG_PTR)DeviceExt + ROUND_UP(sizeof(DEVICE_EXTENSION), sizeof(ULONG)));
 418     DeviceExt->HashTableSize = HashTableSize;
 419     DeviceExt->VolumeDevice = DeviceObject;
 420
 421     /* use same vpb as device disk */
 422     DeviceObject->Vpb = Vpb;
 423     DeviceToMount->Vpb = Vpb;
 424
 425     RtlCopyMemory(&DeviceExt->FatInfo, &FatInfo, sizeof(FATINFO));
 426
 427     DPRINT("BytesPerSector:     %u\n", DeviceExt->FatInfo.BytesPerSector);
 428     DPRINT("SectorsPerCluster:  %u\n", DeviceExt->FatInfo.SectorsPerCluster);
 429     DPRINT("FATCount:           %u\n", DeviceExt->FatInfo.FATCount);
 430     DPRINT("FATSectors:         %u\n", DeviceExt->FatInfo.FATSectors);
 431     DPRINT("RootStart:          %u\n", DeviceExt->FatInfo.rootStart);
 432     DPRINT("DataStart:          %u\n", DeviceExt->FatInfo.dataStart);
 433     if (DeviceExt->FatInfo.FatType == FAT32)
 434     {
 435         DPRINT("RootCluster:        %u\n", DeviceExt->FatInfo.RootCluster);
 436     }
 437
 438     switch (DeviceExt->FatInfo.FatType)
 439     {
 440         case FAT12:
 441             DeviceExt->GetNextCluster = FAT12GetNextCluster;
 442             DeviceExt->FindAndMarkAvailableCluster = FAT12FindAndMarkAvailableCluster;
 443             DeviceExt->WriteCluster = FAT12WriteCluster;
 444             DeviceExt->CleanShutBitMask = 0;
 445             break;
 446
 447         case FAT16:
 448         case FATX16:
 449             DeviceExt->GetNextCluster = FAT16GetNextCluster;
 450             DeviceExt->FindAndMarkAvailableCluster = FAT16FindAndMarkAvailableCluster;
 451             DeviceExt->WriteCluster = FAT16WriteCluster;
 452             DeviceExt->CleanShutBitMask = 0x8000;
 453             break;
 454
 455         case FAT32:
 456         case FATX32:
 457             DeviceExt->GetNextCluster = FAT32GetNextCluster;
 458             DeviceExt->FindAndMarkAvailableCluster = FAT32FindAndMarkAvailableCluster;
 459             DeviceExt->WriteCluster = FAT32WriteCluster;
 460             DeviceExt->CleanShutBitMask = 0x80000000;
 461             break;
 462     }
 463
 464     if (DeviceExt->FatInfo.FatType == FATX16 ||
 465         DeviceExt->FatInfo.FatType == FATX32)
 466     {
 467         DeviceExt->Flags |= VCB_IS_FATX;
 468         DeviceExt->GetNextDirEntry = FATXGetNextDirEntry;
 469         DeviceExt->BaseDateYear = 2000;
 470     }
 471     else
 472     {
 473         DeviceExt->GetNextDirEntry = FATGetNextDirEntry;
 474         DeviceExt->BaseDateYear = 1980;
 475     }
 476
 477     DeviceExt->StorageDevice = DeviceToMount;
 478     DeviceExt->StorageDevice->Vpb->DeviceObject = DeviceObject;
 479     DeviceExt->StorageDevice->Vpb->RealDevice = DeviceExt->StorageDevice;
 480     DeviceExt->StorageDevice->Vpb->Flags |= VPB_MOUNTED;
 481     DeviceObject->StackSize = DeviceExt->StorageDevice->StackSize + 1;
 482     DeviceObject->Flags &= ~DO_DEVICE_INITIALIZING;
 483
 484     DPRINT("FsDeviceObject %p\n", DeviceObject);
 485
 486     /* Initialize this resource early ... it's used in VfatCleanup */
 487     ExInitializeResourceLite(&DeviceExt->DirResource);
 488
 489     DeviceExt->IoVPB = DeviceObject->Vpb;
 490     DeviceExt->SpareVPB = ExAllocatePoolWithTag(NonPagedPool, sizeof(VPB), TAG_VFAT);
 491     if (DeviceExt->SpareVPB == NULL)
 492     {
 493         Status = STATUS_INSUFFICIENT_RESOURCES;
 494         goto ByeBye;
 495     }
 496
 497     DeviceExt->FATFileObject = IoCreateStreamFileObject(NULL, DeviceExt->StorageDevice);
 498     Fcb = vfatNewFCB(DeviceExt, &NameU);
 499     if (Fcb == NULL)
 500     {
 501         Status = STATUS_INSUFFICIENT_RESOURCES;
 502         goto ByeBye;
 503     }
 504
 505     Ccb = ExAllocateFromNPagedLookasideList(&VfatGlobalData->CcbLookasideList);
 506     if (Ccb == NULL)
 507     {
 508         Status =  STATUS_INSUFFICIENT_RESOURCES;
 509         goto ByeBye;
 510     }
 511
 512     RtlZeroMemory(Ccb, sizeof (VFATCCB));
 513     DeviceExt->FATFileObject->FsContext = Fcb;
 514     DeviceExt->FATFileObject->FsContext2 = Ccb;
 515     DeviceExt->FATFileObject->SectionObjectPointer = &Fcb->SectionObjectPointers;
 516     DeviceExt->FATFileObject->PrivateCacheMap = NULL;
 517     DeviceExt->FATFileObject->Vpb = DeviceObject->Vpb;
 518     Fcb->FileObject = DeviceExt->FATFileObject;
 519
 520     Fcb->Flags |= FCB_IS_FAT;
 521
 522     Fcb->RFCB.FileSize.QuadPart = DeviceExt->FatInfo.FATSectors * DeviceExt->FatInfo.BytesPerSector;
 523     Fcb->RFCB.ValidDataLength = Fcb->RFCB.FileSize;
 524     Fcb->RFCB.AllocationSize = Fcb->RFCB.FileSize;
 525
 526     _SEH2_TRY
 527     {
 528         CcInitializeCacheMap(DeviceExt->FATFileObject,
 529                              (PCC_FILE_SIZES)(&Fcb->RFCB.AllocationSize),
 530                              TRUE,
 531                              &VfatGlobalData->CacheMgrCallbacks,
 532                              Fcb);
 533     }
 534     _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 535     {
 536         Status = _SEH2_GetExceptionCode();
 537         goto ByeBye;
 538     }
 539     _SEH2_END;
 540
 541     DeviceExt->LastAvailableCluster = 2;
 542     ExInitializeResourceLite(&DeviceExt->FatResource);
 543
 544     InitializeListHead(&DeviceExt->FcbListHead);
 545
 546     VolumeFcb = vfatNewFCB(DeviceExt, &VolumeNameU);
 547     if (VolumeFcb == NULL)
 548     {
 549         Status = STATUS_INSUFFICIENT_RESOURCES;
 550         goto ByeBye;
 551     }
 552
 553     VolumeFcb->Flags = FCB_IS_VOLUME;
 554     VolumeFcb->RFCB.FileSize.QuadPart = (LONGLONG) DeviceExt->FatInfo.Sectors * DeviceExt->FatInfo.BytesPerSector;
 555     VolumeFcb->RFCB.ValidDataLength = VolumeFcb->RFCB.FileSize;
 556     VolumeFcb->RFCB.AllocationSize = VolumeFcb->RFCB.FileSize;
 557     DeviceExt->VolumeFcb = VolumeFcb;
 558
 559     ExAcquireResourceExclusiveLite(&VfatGlobalData->VolumeListLock, TRUE);
 560     InsertHeadList(&VfatGlobalData->VolumeListHead, &DeviceExt->VolumeListEntry);
 561     ExReleaseResourceLite(&VfatGlobalData->VolumeListLock);
 562
 563     /* read serial number */
 564     DeviceObject->Vpb->SerialNumber = DeviceExt->FatInfo.VolumeID;
 565
 566     /* read volume label */
 567     ReadVolumeLabel(DeviceExt,  DeviceObject->Vpb);
 568
 569     /* read clean shutdown bit status */
 570     Status = GetNextCluster(DeviceExt, 1, &eocMark);
 571     if (NT_SUCCESS(Status))
 572     {
 573         if (eocMark & DeviceExt->CleanShutBitMask)
 574         {
 575             /* unset clean shutdown bit */
 576             eocMark &= ~DeviceExt->CleanShutBitMask;
 577             WriteCluster(DeviceExt, 1, eocMark);
 578             VolumeFcb->Flags |= VCB_CLEAR_DIRTY;
 579         }
 580     }
 581
 582     VolumeFcb->Flags |= VCB_IS_DIRTY;
 583
 584     FsRtlNotifyVolumeEvent(DeviceExt->FATFileObject, FSRTL_VOLUME_MOUNT);
 585     FsRtlNotifyInitializeSync(&DeviceExt->NotifySync);
 586     InitializeListHead(&DeviceExt->NotifyList);
 587
 588     DPRINT("Mount success\n");
 589
 590     Status = STATUS_SUCCESS;
 591
 592 ByeBye:
 593     if (!NT_SUCCESS(Status))
 594     {
 595         /* Cleanup */
 596         if (DeviceExt && DeviceExt->FATFileObject)
 597             ObDereferenceObject (DeviceExt->FATFileObject);
 598         if (DeviceExt && DeviceExt->SpareVPB)
 599             ExFreePoolWithTag(DeviceExt->SpareVPB, TAG_VFAT);
 600         if (Fcb)
 601             vfatDestroyFCB(Fcb);
 602         if (Ccb)
 603             vfatDestroyCCB(Ccb);
 604         if (DeviceObject)
 605             IoDeleteDevice(DeviceObject);
 606     }
 607
 608     return Status;
 609 }
 610
 611
 612 /*
 613  * FUNCTION: Verify the filesystem
 614  */
 615 static
 616 NTSTATUS
 617 VfatVerify(
 618     PVFAT_IRP_CONTEXT IrpContext)
 619 {
 620     PDEVICE_OBJECT DeviceToVerify;
 621     NTSTATUS Status = STATUS_SUCCESS;
 622     FATINFO FatInfo;
 623     BOOLEAN RecognizedFS;
 624     PDEVICE_EXTENSION DeviceExt;
 625
 626     DPRINT("VfatVerify(IrpContext %p)\n", IrpContext);
 627
 628     DeviceToVerify = IrpContext->Stack->Parameters.VerifyVolume.DeviceObject;
 629     DeviceExt = DeviceToVerify->DeviceExtension;
 630     Status = VfatBlockDeviceIoControl(DeviceExt->StorageDevice,
 631                                       IOCTL_DISK_CHECK_VERIFY,
 632                                       NULL,
 633                                       0,
 634                                       NULL,
 635                                       0,
 636                                       TRUE);
 637     if (!NT_SUCCESS(Status) && Status != STATUS_VERIFY_REQUIRED)
 638     {
 639         DPRINT("VfatBlockDeviceIoControl() failed (Status %lx)\n", Status);
 640         Status = STATUS_WRONG_VOLUME;
 641     }
 642     else
 643     {
 644         Status = VfatHasFileSystem(DeviceExt->StorageDevice, &RecognizedFS, &FatInfo, TRUE);
 645         if (!NT_SUCCESS(Status) || RecognizedFS == FALSE)
 646         {
 647             Status = STATUS_WRONG_VOLUME;
 648         }
 649         else if (sizeof(FATINFO) == RtlCompareMemory(&FatInfo, &DeviceExt->FatInfo, sizeof(FATINFO)))
 650         {
 651             DPRINT1("Same volume\n");
 652             /*
 653              * FIXME:
 654              *   Preformatted floppy disks have very often a serial number of 0000:0000.
 655              *   We should calculate a crc sum over the sectors from the root directory as secondary volume number.
 656              *   Each write to the root directory must update this crc sum.
 657              */
 658             /* HACK */
 659             if (!FatInfo.FixedMedia && FatInfo.FatType >= FATX16)
 660             {
 661                 Status = STATUS_WRONG_VOLUME;
 662             }
 663         }
 664         else
 665         {
 666             Status = STATUS_WRONG_VOLUME;
 667         }
 668     }
 669
 670     IrpContext->Stack->Parameters.VerifyVolume.Vpb->RealDevice->Flags &= ~DO_VERIFY_VOLUME;
 671
 672     return Status;
 673 }
 674
 675
 676 static
 677 NTSTATUS
 678 VfatGetVolumeBitmap(
 679     PVFAT_IRP_CONTEXT IrpContext)
 680 {
 681     DPRINT("VfatGetVolumeBitmap (IrpContext %p)\n", IrpContext);
 682     return STATUS_INVALID_DEVICE_REQUEST;
 683 }
 684
 685
 686 static
 687 NTSTATUS
 688 VfatGetRetrievalPointers(
 689     PVFAT_IRP_CONTEXT IrpContext)
 690 {
 691     PIO_STACK_LOCATION Stack;
 692     LARGE_INTEGER Vcn;
 693     PRETRIEVAL_POINTERS_BUFFER RetrievalPointers;
 694     PFILE_OBJECT FileObject;
 695     ULONG MaxExtentCount;
 696     PVFATFCB Fcb;
 697     PDEVICE_EXTENSION DeviceExt;
 698     ULONG FirstCluster;
 699     ULONG CurrentCluster;
 700     ULONG LastCluster;
 701     NTSTATUS Status;
 702
 703     DPRINT("VfatGetRetrievalPointers(IrpContext %p)\n", IrpContext);
 704
 705     DeviceExt = IrpContext->DeviceExt;
 706     FileObject = IrpContext->FileObject;
 707     Stack = IrpContext->Stack;
 708     if (Stack->Parameters.DeviceIoControl.InputBufferLength < sizeof(STARTING_VCN_INPUT_BUFFER) ||
 709         Stack->Parameters.DeviceIoControl.Type3InputBuffer == NULL)
 710     {
 711         return STATUS_INVALID_PARAMETER;
 712     }
 713
 714     if (IrpContext->Irp->UserBuffer == NULL ||
 715         Stack->Parameters.DeviceIoControl.OutputBufferLength < sizeof(RETRIEVAL_POINTERS_BUFFER))
 716     {
 717         return STATUS_BUFFER_TOO_SMALL;
 718     }
 719
 720     Fcb = FileObject->FsContext;
 721
 722     ExAcquireResourceSharedLite(&Fcb->MainResource, TRUE);
 723
 724     Vcn = ((PSTARTING_VCN_INPUT_BUFFER)Stack->Parameters.DeviceIoControl.Type3InputBuffer)->StartingVcn;
 725     RetrievalPointers = IrpContext->Irp->UserBuffer;
 726
 727     MaxExtentCount = ((Stack->Parameters.DeviceIoControl.OutputBufferLength - sizeof(RetrievalPointers->ExtentCount) - sizeof(RetrievalPointers->StartingVcn)) / sizeof(RetrievalPointers->Extents[0]));
 728
 729     if (Vcn.QuadPart >= Fcb->RFCB.AllocationSize.QuadPart / DeviceExt->FatInfo.BytesPerCluster)
 730     {
 731         Status = STATUS_INVALID_PARAMETER;
 732         goto ByeBye;
 733     }
 734
 735     CurrentCluster = FirstCluster = vfatDirEntryGetFirstCluster(DeviceExt, &Fcb->entry);
 736     Status = OffsetToCluster(DeviceExt, FirstCluster,
 737                              Vcn.u.LowPart * DeviceExt->FatInfo.BytesPerCluster,
 738                              &CurrentCluster, FALSE);
 739     if (!NT_SUCCESS(Status))
 740     {
 741         goto ByeBye;
 742     }
 743
 744     RetrievalPointers->StartingVcn = Vcn;
 745     RetrievalPointers->ExtentCount = 0;
 746     RetrievalPointers->Extents[0].Lcn.u.HighPart = 0;
 747     RetrievalPointers->Extents[0].Lcn.u.LowPart = CurrentCluster - 2;
 748     LastCluster = 0;
 749     while (CurrentCluster != 0xffffffff && RetrievalPointers->ExtentCount < MaxExtentCount)
 750     {
 751         LastCluster = CurrentCluster;
 752         Status = NextCluster(DeviceExt, CurrentCluster, &CurrentCluster, FALSE);
 753         Vcn.QuadPart++;
 754         if (!NT_SUCCESS(Status))
 755         {
 756             goto ByeBye;
 757         }
 758
 759         if (LastCluster + 1 != CurrentCluster)
 760         {
 761             RetrievalPointers->Extents[RetrievalPointers->ExtentCount].NextVcn = Vcn;
 762             RetrievalPointers->ExtentCount++;
 763             if (RetrievalPointers->ExtentCount < MaxExtentCount)
 764             {
 765                 RetrievalPointers->Extents[RetrievalPointers->ExtentCount].Lcn.u.HighPart = 0;
 766                 RetrievalPointers->Extents[RetrievalPointers->ExtentCount].Lcn.u.LowPart = CurrentCluster - 2;
 767             }
 768         }
 769     }
 770
 771     IrpContext->Irp->IoStatus.Information = sizeof(RETRIEVAL_POINTERS_BUFFER) + (sizeof(RetrievalPointers->Extents[0]) * (RetrievalPointers->ExtentCount - 1));
 772     Status = STATUS_SUCCESS;
 773
 774 ByeBye:
 775     ExReleaseResourceLite(&Fcb->MainResource);
 776
 777     return Status;
 778 }
 779
 780 static
 781 NTSTATUS
 782 VfatMoveFile(
 783     PVFAT_IRP_CONTEXT IrpContext)
 784 {
 785     DPRINT("VfatMoveFile(IrpContext %p)\n", IrpContext);
 786     return STATUS_INVALID_DEVICE_REQUEST;
 787 }
 788
 789 static
 790 NTSTATUS
 791 VfatIsVolumeDirty(
 792     PVFAT_IRP_CONTEXT IrpContext)
 793 {
 794     PULONG Flags;
 795
 796     DPRINT("VfatIsVolumeDirty(IrpContext %p)\n", IrpContext);
 797
 798     if (IrpContext->Stack->Parameters.FileSystemControl.OutputBufferLength != sizeof(ULONG))
 799         return STATUS_INVALID_BUFFER_SIZE;
 800     else if (!IrpContext->Irp->AssociatedIrp.SystemBuffer)
 801         return STATUS_INVALID_USER_BUFFER;
 802
 803     Flags = (PULONG)IrpContext->Irp->AssociatedIrp.SystemBuffer;
 804     *Flags = 0;
 805
 806     if ((IrpContext->DeviceExt->VolumeFcb->Flags & VCB_IS_DIRTY) &&
 807         !(IrpContext->DeviceExt->VolumeFcb->Flags & VCB_CLEAR_DIRTY))
 808     {
 809         *Flags |= VOLUME_IS_DIRTY;
 810     }
 811
 812     return STATUS_SUCCESS;
 813 }
 814
 815 static
 816 NTSTATUS
 817 VfatMarkVolumeDirty(
 818     PVFAT_IRP_CONTEXT IrpContext)
 819 {
 820     ULONG eocMark;
 821     PDEVICE_EXTENSION DeviceExt;
 822     NTSTATUS Status = STATUS_SUCCESS;
 823
 824     DPRINT("VfatMarkVolumeDirty(IrpContext %p)\n", IrpContext);
 825     DeviceExt = IrpContext->DeviceExt;
 826
 827     if (!(DeviceExt->VolumeFcb->Flags & VCB_IS_DIRTY))
 828     {
 829         Status = GetNextCluster(DeviceExt, 1, &eocMark);
 830         if (NT_SUCCESS(Status))
 831         {
 832             /* unset clean shutdown bit */
 833             eocMark &= ~DeviceExt->CleanShutBitMask;
 834             Status = WriteCluster(DeviceExt, 1, eocMark);
 835         }
 836     }
 837
 838     DeviceExt->VolumeFcb->Flags &= ~VCB_CLEAR_DIRTY;
 839
 840     return Status;
 841 }
 842
 843 static
 844 NTSTATUS
 845 VfatLockOrUnlockVolume(
 846     PVFAT_IRP_CONTEXT IrpContext,
 847     BOOLEAN Lock)
 848 {
 849     PFILE_OBJECT FileObject;
 850     PDEVICE_EXTENSION DeviceExt;
 851     PVFATFCB Fcb;
 852
 853     DPRINT("VfatLockOrUnlockVolume(%p, %d)\n", IrpContext, Lock);
 854
 855     DeviceExt = IrpContext->DeviceExt;
 856     FileObject = IrpContext->FileObject;
 857     Fcb = FileObject->FsContext;
 858
 859     /* Only allow locking with the volume open */
 860     if (!(Fcb->Flags & FCB_IS_VOLUME))
 861     {
 862         return STATUS_ACCESS_DENIED;
 863     }
 864
 865     /* Bail out if it's already in the demanded state */
 866     if (((DeviceExt->Flags & VCB_VOLUME_LOCKED) && Lock) ||
 867         (!(DeviceExt->Flags & VCB_VOLUME_LOCKED) && !Lock))
 868     {
 869         return STATUS_ACCESS_DENIED;
 870     }
 871
 872     /* Deny locking if we're not alone */
 873     if (Lock && DeviceExt->OpenHandleCount != 1)
 874     {
 875         return STATUS_ACCESS_DENIED;
 876     }
 877
 878     /* Finally, proceed */
 879     if (Lock)
 880     {
 881         DeviceExt->Flags |= VCB_VOLUME_LOCKED;
 882     }
 883     else
 884     {
 885         DeviceExt->Flags &= ~VCB_VOLUME_LOCKED;
 886     }
 887
 888     return STATUS_SUCCESS;
 889 }
 890
 891 static
 892 NTSTATUS
 893 VfatDismountVolume(
 894     PVFAT_IRP_CONTEXT IrpContext)
 895 {
 896     PDEVICE_EXTENSION DeviceExt;
 897     PLIST_ENTRY NextEntry;
 898     PVFATFCB Fcb;
 899     PFILE_OBJECT FileObject;
 900     ULONG eocMark;
 901     NTSTATUS Status;
 902
 903     DPRINT("VfatDismountVolume(%p)\n", IrpContext);
 904
 905     DeviceExt = IrpContext->DeviceExt;
 906     FileObject = IrpContext->FileObject;
 907
 908     /* We HAVE to be locked. Windows also allows dismount with no lock
 909      * but we're here mainly for 1st stage, so KISS
 910      */
 911     if (!(DeviceExt->Flags & VCB_VOLUME_LOCKED))
 912     {
 913         return STATUS_ACCESS_DENIED;
 914     }
 915
 916     /* Race condition? */
 917     if (DeviceExt->Flags & VCB_DISMOUNT_PENDING)
 918     {
 919         return STATUS_VOLUME_DISMOUNTED;
 920     }
 921
 922     /* Notify we'll dismount. Pass that point there's no reason we fail */
 923     FsRtlNotifyVolumeEvent(IrpContext->Stack->FileObject, FSRTL_VOLUME_DISMOUNT);
 924
 925     ExAcquireResourceExclusiveLite(&DeviceExt->FatResource, TRUE);
 926
 927     if (DeviceExt->VolumeFcb->Flags & VCB_CLEAR_DIRTY)
 928     {
 929         /* Set clean shutdown bit */
 930         Status = GetNextCluster(DeviceExt, 1, &eocMark);
 931         if (NT_SUCCESS(Status))
 932         {
 933             eocMark |= DeviceExt->CleanShutBitMask;
 934             if (NT_SUCCESS(WriteCluster(DeviceExt, 1, eocMark)))
 935                 DeviceExt->VolumeFcb->Flags &= ~VCB_IS_DIRTY;
 936         }
 937     }
 938
 939     /* Flush volume & files */
 940     VfatFlushVolume(DeviceExt, (PVFATFCB)FileObject->FsContext);
 941
 942     /* Rebrowse the FCB in order to free them now */
 943     while (!IsListEmpty(&DeviceExt->FcbListHead))
 944     {
 945         NextEntry = RemoveHeadList(&DeviceExt->FcbListHead);
 946         Fcb = CONTAINING_RECORD(NextEntry, VFATFCB, FcbListEntry);
 947         vfatDestroyFCB(Fcb);
 948     }
 949
 950     /* Mark we're being dismounted */
 951     DeviceExt->Flags |= VCB_DISMOUNT_PENDING;
 952 #ifndef ENABLE_SWAPOUT
 953     IrpContext->DeviceObject->Vpb->Flags &= ~VPB_MOUNTED;
 954 #endif
 955
 956     ExReleaseResourceLite(&DeviceExt->FatResource);
 957
 958     /* Release a few resources and quit, we're done */
 959     ExDeleteResourceLite(&DeviceExt->DirResource);
 960     ExDeleteResourceLite(&DeviceExt->FatResource);
 961     ObDereferenceObject(DeviceExt->FATFileObject);
 962
 963     return STATUS_SUCCESS;
 964 }
 965
 966 /*
 967  * FUNCTION: File system control
 968  */
 969 NTSTATUS
 970 VfatFileSystemControl(
 971     PVFAT_IRP_CONTEXT IrpContext)
 972 {
 973     NTSTATUS Status;
 974
 975     DPRINT("VfatFileSystemControl(IrpContext %p)\n", IrpContext);
 976
 977     ASSERT(IrpContext);
 978     ASSERT(IrpContext->Irp);
 979     ASSERT(IrpContext->Stack);
 980
 981     IrpContext->Irp->IoStatus.Information = 0;
 982
 983     switch (IrpContext->MinorFunction)
 984     {
 985         case IRP_MN_KERNEL_CALL:
 986         case IRP_MN_USER_FS_REQUEST:
 987             switch(IrpContext->Stack->Parameters.DeviceIoControl.IoControlCode)
 988             {
 989                 case FSCTL_GET_VOLUME_BITMAP:
 990                     Status = VfatGetVolumeBitmap(IrpContext);
 991                     break;
 992
 993                 case FSCTL_GET_RETRIEVAL_POINTERS:
 994                     Status = VfatGetRetrievalPointers(IrpContext);
 995                     break;
 996
 997                 case FSCTL_MOVE_FILE:
 998                     Status = VfatMoveFile(IrpContext);
 999                     break;
1000
1001                 case FSCTL_IS_VOLUME_DIRTY:
1002                     Status = VfatIsVolumeDirty(IrpContext);
1003                     break;
1004
1005                 case FSCTL_MARK_VOLUME_DIRTY:
1006                     Status = VfatMarkVolumeDirty(IrpContext);
1007                     break;
1008
1009                 case FSCTL_LOCK_VOLUME:
1010                     Status = VfatLockOrUnlockVolume(IrpContext, TRUE);
1011                     break;
1012
1013                 case FSCTL_UNLOCK_VOLUME:
1014                     Status = VfatLockOrUnlockVolume(IrpContext, FALSE);
1015                     break;
1016
1017                 case FSCTL_DISMOUNT_VOLUME:
1018                     Status = VfatDismountVolume(IrpContext);
1019                     break;
1020
1021                 default:
1022                     Status = STATUS_INVALID_DEVICE_REQUEST;
1023             }
1024             break;
1025
1026         case IRP_MN_MOUNT_VOLUME:
1027             Status = VfatMount(IrpContext);
1028             break;
1029
1030         case IRP_MN_VERIFY_VOLUME:
1031             DPRINT("VFATFS: IRP_MN_VERIFY_VOLUME\n");
1032             Status = VfatVerify(IrpContext);
1033             break;
1034
1035         default:
1036             DPRINT("VFAT FSC: MinorFunction %u\n", IrpContext->MinorFunction);
1037             Status = STATUS_INVALID_DEVICE_REQUEST;
1038             break;
1039     }
1040
1041     return Status;
1042 }