ntoskrnl/io/fs.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            ntoskrnl/io/fs.c
   6  * PURPOSE:         Filesystem functions
   7  * PROGRAMMER:      David Welch (welch@mcmail.com)
   8  * UPDATE HISTORY:
   9  *                  Created 22/05/98
  10  */
  11
  12 /* INCLUDES *****************************************************************/
  13
  14 #include <ddk/ntddk.h>
  15 #include <internal/io.h>
  16 #include <internal/ps.h>
  17 #include <internal/pool.h>
  18
  19 #define NDEBUG
  20 #include <internal/debug.h>
  21
  22
  23 /* TYPES *******************************************************************/
  24
  25 typedef struct _FILE_SYSTEM_OBJECT
  26 {
  27   PDEVICE_OBJECT DeviceObject;
  28   LIST_ENTRY Entry;
  29 } FILE_SYSTEM_OBJECT, *PFILE_SYSTEM_OBJECT;
  30
  31 typedef struct _FS_CHANGE_NOTIFY_ENTRY
  32 {
  33   LIST_ENTRY FsChangeNotifyList;
  34   PDRIVER_OBJECT DriverObject;
  35   PFSDNOTIFICATIONPROC FSDNotificationProc;
  36 } FS_CHANGE_NOTIFY_ENTRY, *PFS_CHANGE_NOTIFY_ENTRY;
  37
  38
  39 /* GLOBALS ******************************************************************/
  40
  41 static KSPIN_LOCK FileSystemListLock;
  42 static LIST_ENTRY FileSystemListHead;
  43
  44 #ifndef LIBCAPTIVE
  45 static KSPIN_LOCK FsChangeNotifyListLock;
  46 static LIST_ENTRY FsChangeNotifyListHead;
  47 #endif /* LIBCAPTIVE */
  48
  49 #define TAG_FILE_SYSTEM       TAG('F', 'S', 'Y', 'S')
  50 #ifndef LIBCAPTIVE
  51 #define TAG_FS_CHANGE_NOTIFY  TAG('F', 'S', 'C', 'N')
  52
  53
  54 static VOID
  55 IopNotifyFileSystemChange(PDEVICE_OBJECT DeviceObject,
  56                           BOOLEAN DriverActive);
  57 #endif /* LIBCAPTIVE */
  58
  59
  60 /* FUNCTIONS *****************************************************************/
  61
  62 #ifndef LIBCAPTIVE
  63
  64 NTSTATUS STDCALL
  65 NtFsControlFile (
  66         IN      HANDLE                  DeviceHandle,
  67         IN      HANDLE                  EventHandle     OPTIONAL,
  68         IN      PIO_APC_ROUTINE         ApcRoutine      OPTIONAL,
  69         IN      PVOID                   ApcContext      OPTIONAL,
  70         OUT     PIO_STATUS_BLOCK        IoStatusBlock,
  71         IN      ULONG                   IoControlCode,
  72         IN      PVOID                   InputBuffer,
  73         IN      ULONG                   InputBufferSize,
  74         OUT     PVOID                   OutputBuffer,
  75         IN      ULONG                   OutputBufferSize
  76         )
  77 {
  78    NTSTATUS Status;
  79    PFILE_OBJECT FileObject;
  80    PDEVICE_OBJECT DeviceObject;
  81    PIRP Irp;
  82    PIO_STACK_LOCATION StackPtr;
  83    PKEVENT ptrEvent;
  84    IO_STATUS_BLOCK IoSB;
  85
  86    DPRINT("NtFsControlFile(DeviceHandle %x EventHandle %x ApcRoutine %x "
  87           "ApcContext %x IoStatusBlock %x IoControlCode %x "
  88           "InputBuffer %x InputBufferSize %x OutputBuffer %x "
  89           "OutputBufferSize %x)\n",
  90           DeviceHandle,EventHandle,ApcRoutine,ApcContext,IoStatusBlock,
  91           IoControlCode,InputBuffer,InputBufferSize,OutputBuffer,
  92           OutputBufferSize);
  93
  94    Status = ObReferenceObjectByHandle(DeviceHandle,
  95                                       FILE_READ_DATA | FILE_WRITE_DATA,
  96                                       NULL,
  97                                       KernelMode,
  98                                       (PVOID *) &FileObject,
  99                                       NULL);
 100
 101    if (!NT_SUCCESS(Status))
 102      {
 103         return(Status);
 104      }
 105
 106    if (EventHandle != NULL)
 107      {
 108         Status = ObReferenceObjectByHandle (EventHandle,
 109                                             SYNCHRONIZE,
 110                                             ExEventObjectType,
 111                                             UserMode,
 112                                             (PVOID*)&ptrEvent,
 113                                             NULL);
 114         if (!NT_SUCCESS(Status))
 115           {
 116             ObDereferenceObject(FileObject);
 117             return Status;
 118           }
 119       }
 120     else
 121       {
 122          KeResetEvent (&FileObject->Event);
 123          ptrEvent = &FileObject->Event;
 124       }
 125
 126
 127    DeviceObject = FileObject->DeviceObject;
 128
 129    Irp = IoBuildDeviceIoControlRequest(IoControlCode,
 130                                        DeviceObject,
 131                                        InputBuffer,
 132                                        InputBufferSize,
 133                                        OutputBuffer,
 134                                        OutputBufferSize,
 135                                        FALSE,
 136                                        ptrEvent,
 137                                        &IoSB);
 138
 139    Irp->Overlay.AsynchronousParameters.UserApcRoutine = ApcRoutine;
 140    Irp->Overlay.AsynchronousParameters.UserApcContext = ApcContext;
 141
 142    StackPtr = IoGetNextIrpStackLocation(Irp);
 143    StackPtr->FileObject = FileObject;
 144    StackPtr->DeviceObject = DeviceObject;
 145    StackPtr->Parameters.FileSystemControl.InputBufferLength = InputBufferSize;
 146    StackPtr->Parameters.FileSystemControl.OutputBufferLength =
 147      OutputBufferSize;
 148    StackPtr->MajorFunction = IRP_MJ_FILE_SYSTEM_CONTROL;
 149
 150    Status = IoCallDriver(DeviceObject,Irp);
 151    if (Status == STATUS_PENDING && !(FileObject->Flags & FO_SYNCHRONOUS_IO))
 152      {
 153         KeWaitForSingleObject(ptrEvent,Executive,KernelMode,FALSE,NULL);
 154         Status = IoSB.Status;
 155      }
 156    if (IoStatusBlock)
 157      {
 158         *IoStatusBlock = IoSB;
 159      }
 160    return(Status);
 161 }
 162
 163 #endif /* LIBCAPTIVE */
 164
 165 VOID
 166 IoInitFileSystemImplementation(VOID)
 167 {
 168   InitializeListHead(&FileSystemListHead);
 169   KeInitializeSpinLock(&FileSystemListLock);
 170
 171 #ifndef LIBCAPTIVE
 172   InitializeListHead(&FsChangeNotifyListHead);
 173   KeInitializeSpinLock(&FsChangeNotifyListLock);
 174 #endif /* LIBCAPTIVE */
 175 }
 176
 177
 178 VOID
 179 IoShutdownRegisteredFileSystems(VOID)
 180 {
 181    KIRQL oldlvl;
 182    PLIST_ENTRY current_entry;
 183    FILE_SYSTEM_OBJECT* current;
 184    PIRP Irp;
 185    KEVENT Event;
 186    IO_STATUS_BLOCK IoStatusBlock;
 187    NTSTATUS Status;
 188
 189    DPRINT("IoShutdownRegisteredFileSystems()\n");
 190
 191 #ifndef LIBCAPTIVE
 192    /* filesystems cannot be called at DISPATCH_LEVEL */
 193    KeAcquireSpinLock(&FileSystemListLock,&oldlvl);
 194 #endif /* LIBCAPTIVE */
 195    KeInitializeEvent(&Event,NotificationEvent,FALSE);
 196
 197    /* 'current' will get IoDeleteDevice()ed by IRP_MJ_SHUTDOWN! */
 198    /* FIXME: deadlock loop detection */
 199    while ((current_entry = FileSystemListHead.Flink)!=(&FileSystemListHead))
 200      {
 201         current = CONTAINING_RECORD(current_entry,FILE_SYSTEM_OBJECT,Entry);
 202
 203         /* send IRP_MJ_SHUTDOWN */
 204         Irp = IoBuildSynchronousFsdRequest(IRP_MJ_SHUTDOWN,
 205                                            current->DeviceObject,
 206                                            NULL,
 207                                            0,
 208                                            0,
 209                                            &Event,
 210                                            &IoStatusBlock);
 211
 212         Status = IoCallDriver(current->DeviceObject,Irp);
 213         if (Status==STATUS_PENDING)
 214           {
 215              KeWaitForSingleObject(&Event,Executive,KernelMode,FALSE,NULL);
 216           }
 217      }
 218
 219 #ifndef LIBCAPTIVE
 220    /* filesystems cannot be called at DISPATCH_LEVEL */
 221    KeReleaseSpinLock(&FileSystemListLock,oldlvl);
 222 #endif /* LIBCAPTIVE */
 223 }
 224
 225
 226 static NTSTATUS
 227 IopMountFileSystem(PDEVICE_OBJECT DeviceObject,
 228                    PDEVICE_OBJECT DeviceToMount)
 229 {
 230   IO_STATUS_BLOCK IoStatusBlock;
 231   PIO_STACK_LOCATION StackPtr;
 232   PKEVENT Event;
 233   PIRP Irp;
 234   NTSTATUS Status;
 235
 236   DPRINT("IoAskFileSystemToMountDevice(DeviceObject %x, DeviceToMount %x)\n",
 237          DeviceObject,DeviceToMount);
 238
 239   assert_irql(PASSIVE_LEVEL);
 240   Event = ExAllocatePool(NonPagedPool, sizeof(KEVENT));
 241   if (Event == NULL)
 242     {
 243       return(STATUS_INSUFFICIENT_RESOURCES);
 244     }
 245   KeInitializeEvent(Event, NotificationEvent, FALSE);
 246
 247   Irp = IoAllocateIrp(DeviceObject->StackSize, TRUE);
 248   if (Irp==NULL)
 249     {
 250       ExFreePool(Event);
 251       return(STATUS_INSUFFICIENT_RESOURCES);
 252     }
 253
 254   Irp->UserIosb = &IoStatusBlock;
 255   DPRINT("Irp->UserIosb %x\n", Irp->UserIosb);
 256   Irp->UserEvent = Event;
 257   Irp->Tail.Overlay.Thread = PsGetCurrentThread();
 258
 259   StackPtr = IoGetNextIrpStackLocation(Irp);
 260   StackPtr->MajorFunction = IRP_MJ_FILE_SYSTEM_CONTROL;
 261   StackPtr->MinorFunction = IRP_MN_MOUNT_VOLUME;
 262   StackPtr->Flags = 0;
 263   StackPtr->Control = 0;
 264   StackPtr->DeviceObject = DeviceObject;
 265   StackPtr->FileObject = NULL;
 266   StackPtr->CompletionRoutine = NULL;
 267
 268   StackPtr->Parameters.MountVolume.Vpb = DeviceToMount->Vpb;
 269   StackPtr->Parameters.MountVolume.DeviceObject = DeviceToMount;
 270
 271   Status = IoCallDriver(DeviceObject,Irp);
 272   if (Status==STATUS_PENDING)
 273     {
 274       KeWaitForSingleObject(Event,Executive,KernelMode,FALSE,NULL);
 275       Status = IoStatusBlock.Status;
 276     }
 277
 278   ExFreePool(Event);
 279
 280   return(Status);
 281 }
 282
 283
 284 static NTSTATUS
 285 IopLoadFileSystem(IN PDEVICE_OBJECT DeviceObject)
 286 {
 287   IO_STATUS_BLOCK IoStatusBlock;
 288   PIO_STACK_LOCATION StackPtr;
 289   PKEVENT Event;
 290   PIRP Irp;
 291   NTSTATUS Status;
 292
 293   DPRINT("IopLoadFileSystem(DeviceObject %x)\n", DeviceObject);
 294
 295   assert_irql(PASSIVE_LEVEL);
 296   Event = ExAllocatePool(NonPagedPool, sizeof(KEVENT));
 297   if (Event == NULL)
 298     {
 299       return(STATUS_INSUFFICIENT_RESOURCES);
 300     }
 301   KeInitializeEvent(Event, NotificationEvent, FALSE);
 302
 303   Irp = IoAllocateIrp(DeviceObject->StackSize, TRUE);
 304   if (Irp==NULL)
 305     {
 306       ExFreePool(Event);
 307       return(STATUS_INSUFFICIENT_RESOURCES);
 308     }
 309
 310   Irp->UserIosb = &IoStatusBlock;
 311   DPRINT("Irp->UserIosb %x\n", Irp->UserIosb);
 312   Irp->UserEvent = Event;
 313   Irp->Tail.Overlay.Thread = PsGetCurrentThread();
 314
 315   StackPtr = IoGetNextIrpStackLocation(Irp);
 316   StackPtr->MajorFunction = IRP_MJ_FILE_SYSTEM_CONTROL;
 317   StackPtr->MinorFunction = IRP_MN_LOAD_FILE_SYSTEM;
 318   StackPtr->Flags = 0;
 319   StackPtr->Control = 0;
 320   StackPtr->DeviceObject = DeviceObject;
 321   StackPtr->FileObject = NULL;
 322   StackPtr->CompletionRoutine = NULL;
 323
 324   Status = IoCallDriver(DeviceObject,Irp);
 325   if (Status==STATUS_PENDING)
 326     {
 327       KeWaitForSingleObject(Event,Executive,KernelMode,FALSE,NULL);
 328       Status = IoStatusBlock.Status;
 329     }
 330
 331   ExFreePool(Event);
 332
 333   return(Status);
 334 }
 335
 336
 337 NTSTATUS
 338 IoMountVolume(IN PDEVICE_OBJECT DeviceObject,
 339               IN BOOLEAN AllowRawMount)
 340 /*
 341  * FUNCTION: Mounts a logical volume
 342  * ARGUMENTS:
 343  *         DeviceObject = Device to mount
 344  * RETURNS: Status
 345  */
 346 {
 347   KIRQL oldlvl;
 348   PLIST_ENTRY current_entry;
 349   FILE_SYSTEM_OBJECT* current;
 350   NTSTATUS Status;
 351   DEVICE_TYPE MatchingDeviceType;
 352
 353   assert_irql(PASSIVE_LEVEL);
 354
 355   DPRINT("IoMountVolume(DeviceObject %x  AllowRawMount %x)\n",
 356          DeviceObject, AllowRawMount);
 357
 358   switch (DeviceObject->DeviceType)
 359     {
 360       case FILE_DEVICE_DISK:
 361       case FILE_DEVICE_VIRTUAL_DISK: /* ?? */
 362         MatchingDeviceType = FILE_DEVICE_DISK_FILE_SYSTEM;
 363         break;
 364
 365       case FILE_DEVICE_CD_ROM:
 366         MatchingDeviceType = FILE_DEVICE_CD_ROM_FILE_SYSTEM;
 367         break;
 368
 369       case FILE_DEVICE_NETWORK:
 370         MatchingDeviceType = FILE_DEVICE_NETWORK_FILE_SYSTEM;
 371         break;
 372
 373       case FILE_DEVICE_TAPE:
 374         MatchingDeviceType = FILE_DEVICE_TAPE_FILE_SYSTEM;
 375         break;
 376
 377       default:
 378         CPRINT("No matching file system type found for device type: %x\n",
 379                DeviceObject->DeviceType);
 380         return(STATUS_UNRECOGNIZED_VOLUME);
 381     }
 382
 383   KeAcquireSpinLock(&FileSystemListLock,&oldlvl);
 384   current_entry = FileSystemListHead.Flink;
 385   while (current_entry!=(&FileSystemListHead))
 386     {
 387       current = CONTAINING_RECORD(current_entry,FILE_SYSTEM_OBJECT,Entry);
 388       if (current->DeviceObject->DeviceType != MatchingDeviceType)
 389         {
 390           current_entry = current_entry->Flink;
 391           continue;
 392         }
 393       KeReleaseSpinLock(&FileSystemListLock,oldlvl);
 394       Status = IopMountFileSystem(current->DeviceObject,
 395                                   DeviceObject);
 396       KeAcquireSpinLock(&FileSystemListLock,&oldlvl);
 397       switch (Status)
 398         {
 399           case STATUS_FS_DRIVER_REQUIRED:
 400             KeReleaseSpinLock(&FileSystemListLock,oldlvl);
 401             Status = IopLoadFileSystem(current->DeviceObject);
 402             if (!NT_SUCCESS(Status))
 403               {
 404                 return(Status);
 405               }
 406             KeAcquireSpinLock(&FileSystemListLock,&oldlvl);
 407             current_entry = FileSystemListHead.Flink;
 408             continue;
 409
 410           case STATUS_SUCCESS:
 411             DeviceObject->Vpb->Flags = DeviceObject->Vpb->Flags |
 412                                        VPB_MOUNTED;
 413             KeReleaseSpinLock(&FileSystemListLock,oldlvl);
 414             return(STATUS_SUCCESS);
 415
 416           case STATUS_UNRECOGNIZED_VOLUME:
 417           default:
 418             current_entry = current_entry->Flink;
 419         }
 420     }
 421   KeReleaseSpinLock(&FileSystemListLock,oldlvl);
 422
 423   return(STATUS_UNRECOGNIZED_VOLUME);
 424 }
 425
 426 #ifndef LIBCAPTIVE
 427
 428 /**********************************************************************
 429  * NAME                                                 EXPORTED
 430  *      IoVerifyVolume
 431  *
 432  * DESCRIPTION
 433  *      Verify the file system type and volume information or mount
 434  *      a file system.
 435  *
 436  * ARGUMENTS
 437  *      DeviceObject
 438  *              Device to verify or mount
 439  *
 440  *      AllowRawMount
 441  *              ...
 442  *
 443  * RETURN VALUE
 444  *      Status
 445  */
 446 NTSTATUS STDCALL
 447 IoVerifyVolume(IN PDEVICE_OBJECT DeviceObject,
 448                IN BOOLEAN AllowRawMount)
 449 {
 450   IO_STATUS_BLOCK IoStatusBlock;
 451   PIO_STACK_LOCATION StackPtr;
 452   PKEVENT Event;
 453   PIRP Irp;
 454   NTSTATUS Status;
 455
 456   DPRINT("IoVerifyVolume(DeviceObject %x  AllowRawMount %x)\n",
 457          DeviceObject, AllowRawMount);
 458
 459   Status = STATUS_SUCCESS;
 460
 461   KeWaitForSingleObject(&DeviceObject->DeviceLock,
 462                         Executive,
 463                         KernelMode,
 464                         FALSE,
 465                         NULL);
 466
 467   DeviceObject->Flags &= ~DO_VERIFY_VOLUME;
 468
 469   if (DeviceObject->Vpb->Flags & VPB_MOUNTED)
 470     {
 471       /* Issue verify request to the FSD */
 472       Event = ExAllocatePool(NonPagedPool,
 473                              sizeof(KEVENT));
 474       if (Event == NULL)
 475         return(STATUS_INSUFFICIENT_RESOURCES);
 476
 477       KeInitializeEvent(Event,
 478                         NotificationEvent,
 479                         FALSE);
 480
 481       Irp = IoAllocateIrp(DeviceObject->StackSize, TRUE);
 482       if (Irp==NULL)
 483         {
 484           ExFreePool(Event);
 485           return(STATUS_INSUFFICIENT_RESOURCES);
 486         }
 487
 488       Irp->UserIosb = &IoStatusBlock;
 489       Irp->UserEvent = Event;
 490       Irp->Tail.Overlay.Thread = PsGetCurrentThread();
 491
 492       StackPtr = IoGetNextIrpStackLocation(Irp);
 493       StackPtr->MajorFunction = IRP_MJ_FILE_SYSTEM_CONTROL;
 494       StackPtr->MinorFunction = IRP_MN_VERIFY_VOLUME;
 495       StackPtr->Flags = 0;
 496       StackPtr->Control = 0;
 497       StackPtr->DeviceObject = DeviceObject;
 498       StackPtr->FileObject = NULL;
 499       StackPtr->CompletionRoutine = NULL;
 500
 501       StackPtr->Parameters.VerifyVolume.Vpb = DeviceObject->Vpb;
 502       StackPtr->Parameters.VerifyVolume.DeviceObject = DeviceObject;
 503
 504       Status = IoCallDriver(DeviceObject,
 505                             Irp);
 506       if (Status==STATUS_PENDING)
 507         {
 508           KeWaitForSingleObject(Event,Executive,KernelMode,FALSE,NULL);
 509           Status = IoStatusBlock.Status;
 510         }
 511       ExFreePool(Event);
 512
 513       if (NT_SUCCESS(Status))
 514         {
 515           KeSetEvent(&DeviceObject->DeviceLock,
 516                      IO_NO_INCREMENT,
 517                      FALSE);
 518           return(STATUS_SUCCESS);
 519         }
 520     }
 521
 522   if (Status == STATUS_WRONG_VOLUME)
 523     {
 524       /* Clean existing VPB. This unmounts the filesystem (in an ugly way). */
 525       DPRINT("Wrong volume!\n");
 526
 527       DeviceObject->Vpb->DeviceObject = NULL;
 528       DeviceObject->Vpb->Flags &= ~VPB_MOUNTED;
 529     }
 530
 531   /* Start mount sequence */
 532   Status = IoMountVolume(DeviceObject,
 533                          AllowRawMount);
 534
 535   KeSetEvent(&DeviceObject->DeviceLock,
 536              IO_NO_INCREMENT,
 537              FALSE);
 538
 539   return(Status);
 540 }
 541
 542
 543 PDEVICE_OBJECT STDCALL
 544 IoGetDeviceToVerify(IN PETHREAD Thread)
 545 /*
 546  * FUNCTION: Returns a pointer to the device, representing a removable-media
 547  * device, that is the target of the given thread's I/O request
 548  */
 549 {
 550   return(Thread->DeviceToVerify);
 551 }
 552
 553
 554 VOID STDCALL
 555 IoSetDeviceToVerify(IN PETHREAD Thread,
 556                     IN PDEVICE_OBJECT DeviceObject)
 557 {
 558   Thread->DeviceToVerify = DeviceObject;
 559 }
 560
 561 #endif /* LIBCAPTIVE */
 562
 563 VOID STDCALL
 564 IoSetHardErrorOrVerifyDevice(IN PIRP Irp,
 565                              IN PDEVICE_OBJECT DeviceObject)
 566 {
 567   Irp->Tail.Overlay.Thread->DeviceToVerify = DeviceObject;
 568 }
 569
 570
 571 VOID STDCALL
 572 IoRegisterFileSystem(IN PDEVICE_OBJECT DeviceObject)
 573 {
 574   PFILE_SYSTEM_OBJECT Fs;
 575
 576   DPRINT("IoRegisterFileSystem(DeviceObject %x)\n",DeviceObject);
 577
 578   Fs = ExAllocatePoolWithTag(NonPagedPool,
 579                              sizeof(FILE_SYSTEM_OBJECT),
 580                              TAG_FILE_SYSTEM);
 581   assert(Fs!=NULL);
 582
 583   Fs->DeviceObject = DeviceObject;
 584   ExInterlockedInsertTailList(&FileSystemListHead,
 585                               &Fs->Entry,
 586                               &FileSystemListLock);
 587 #ifndef LIBCAPTIVE
 588   IopNotifyFileSystemChange(DeviceObject,
 589                             TRUE);
 590 #endif /* LIBCAPTIVE */
 591 }
 592
 593
 594 VOID STDCALL
 595 IoUnregisterFileSystem(IN PDEVICE_OBJECT DeviceObject)
 596 {
 597   KIRQL oldlvl;
 598   PLIST_ENTRY current_entry;
 599   PFILE_SYSTEM_OBJECT current;
 600
 601   DPRINT("IoUnregisterFileSystem(DeviceObject %x)\n",DeviceObject);
 602
 603   KeAcquireSpinLock(&FileSystemListLock,&oldlvl);
 604   current_entry = FileSystemListHead.Flink;
 605   while (current_entry!=(&FileSystemListHead))
 606     {
 607       current = CONTAINING_RECORD(current_entry,FILE_SYSTEM_OBJECT,Entry);
 608       if (current->DeviceObject == DeviceObject)
 609         {
 610           RemoveEntryList(current_entry);
 611           ExFreePool(current);
 612           KeReleaseSpinLock(&FileSystemListLock,oldlvl);
 613 #ifndef LIBCAPTIVE
 614           IopNotifyFileSystemChange(DeviceObject, FALSE);
 615 #endif /* LIBCAPTIVE */
 616           return;
 617         }
 618       current_entry = current_entry->Flink;
 619     }
 620   KeReleaseSpinLock(&FileSystemListLock,oldlvl);
 621 }
 622
 623
 624 #ifndef LIBCAPTIVE
 625
 626 /**********************************************************************
 627  * NAME                                                 EXPORTED
 628  *      IoGetBaseFileSystemDeviceObject@4
 629  *
 630  * DESCRIPTION
 631  *      Get the DEVICE_OBJECT associated to
 632  *      a FILE_OBJECT.
 633  *
 634  * ARGUMENTS
 635  *      FileObject
 636  *
 637  * RETURN VALUE
 638  *
 639  * NOTE
 640  *      From Bo Branten's ntifs.h v13.
 641  */
 642 PDEVICE_OBJECT STDCALL
 643 IoGetBaseFileSystemDeviceObject(IN PFILE_OBJECT FileObject)
 644 {
 645         PDEVICE_OBJECT  DeviceObject = NULL;
 646         PVPB            Vpb = NULL;
 647
 648         /*
 649          * If the FILE_OBJECT's VPB is defined,
 650          * get the device from it.
 651          */
 652         if (NULL != (Vpb = FileObject->Vpb))
 653         {
 654                 if (NULL != (DeviceObject = Vpb->DeviceObject))
 655                 {
 656                         /* Vpb->DeviceObject DEFINED! */
 657                         return DeviceObject;
 658                 }
 659         }
 660         /*
 661          * If that failed, try the VPB
 662          * in the FILE_OBJECT's DeviceObject.
 663          */
 664         DeviceObject = FileObject->DeviceObject;
 665         if (NULL == (Vpb = DeviceObject->Vpb))
 666         {
 667                 /* DeviceObject->Vpb UNDEFINED! */
 668                 return DeviceObject;
 669         }
 670         /*
 671          * If that pointer to the VPB is again
 672          * undefined, return directly the
 673          * device object from the FILE_OBJECT.
 674          */
 675         return (
 676                 (NULL == Vpb->DeviceObject)
 677                         ? DeviceObject
 678                         : Vpb->DeviceObject
 679                 );
 680 }
 681
 682
 683 static VOID
 684 IopNotifyFileSystemChange(PDEVICE_OBJECT DeviceObject,
 685                           BOOLEAN DriverActive)
 686 {
 687   PFS_CHANGE_NOTIFY_ENTRY ChangeEntry;
 688   PLIST_ENTRY Entry;
 689   KIRQL oldlvl;
 690
 691   KeAcquireSpinLock(&FsChangeNotifyListLock,&oldlvl);
 692   Entry = FsChangeNotifyListHead.Flink;
 693   while (Entry != &FsChangeNotifyListHead)
 694     {
 695       ChangeEntry = CONTAINING_RECORD(Entry, FS_CHANGE_NOTIFY_ENTRY, FsChangeNotifyList);
 696
 697       (ChangeEntry->FSDNotificationProc)(DeviceObject, DriverActive);
 698
 699       Entry = Entry->Flink;
 700     }
 701   KeReleaseSpinLock(&FsChangeNotifyListLock,oldlvl);
 702 }
 703
 704
 705 NTSTATUS STDCALL
 706 IoRegisterFsRegistrationChange(IN PDRIVER_OBJECT DriverObject,
 707                                IN PFSDNOTIFICATIONPROC FSDNotificationProc)
 708 {
 709   PFS_CHANGE_NOTIFY_ENTRY Entry;
 710
 711   Entry = ExAllocatePoolWithTag(NonPagedPool,
 712                                 sizeof(FS_CHANGE_NOTIFY_ENTRY),
 713                                 TAG_FS_CHANGE_NOTIFY);
 714   if (Entry == NULL)
 715     return(STATUS_INSUFFICIENT_RESOURCES);
 716
 717   Entry->DriverObject = DriverObject;
 718   Entry->FSDNotificationProc = FSDNotificationProc;
 719
 720   ExInterlockedInsertHeadList(&FsChangeNotifyListHead,
 721                               &Entry->FsChangeNotifyList,
 722                               &FsChangeNotifyListLock);
 723
 724   return(STATUS_SUCCESS);
 725 }
 726
 727
 728 VOID STDCALL
 729 IoUnregisterFsRegistrationChange(IN PDRIVER_OBJECT DriverObject,
 730                                  IN PFSDNOTIFICATIONPROC FSDNotificationProc)
 731 {
 732   PFS_CHANGE_NOTIFY_ENTRY ChangeEntry;
 733   PLIST_ENTRY Entry;
 734   KIRQL oldlvl;
 735
 736   Entry = FsChangeNotifyListHead.Flink;
 737   while (Entry != &FsChangeNotifyListHead)
 738     {
 739       ChangeEntry = CONTAINING_RECORD(Entry, FS_CHANGE_NOTIFY_ENTRY, FsChangeNotifyList);
 740       if (ChangeEntry->DriverObject == DriverObject &&
 741           ChangeEntry->FSDNotificationProc == FSDNotificationProc)
 742         {
 743           KeAcquireSpinLock(&FsChangeNotifyListLock,&oldlvl);
 744           RemoveEntryList(Entry);
 745           KeReleaseSpinLock(&FsChangeNotifyListLock,oldlvl);
 746
 747           ExFreePool(Entry);
 748           return;
 749         }
 750
 751       Entry = Entry->Flink;
 752     }
 753 }
 754
 755 #endif /* LIBCAPTIVE */
 756
 757 /* EOF */