C++ ExReleaseResourceLite函数代码示例

//.........这里部分代码省略.........
	pIrpSp = IoGetCurrentIrpStackLocation(pIrp);
	ASSERT(pIrp);

	pFileObject = pIrpSp->FileObject;
	ASSERT(pFileObject);

	TypeOfOpen = xixfs_DecodeFileObject( pFileObject, &pFCB, &pCCB );

    if (TypeOfOpen == UnopenedFileObject) {
		RC = STATUS_INVALID_PARAMETER;
        xixfs_CompleteRequest( pIrpContext, STATUS_INVALID_PARAMETER, 0 );
        return RC;
    }


	DebugTrace(DEBUG_LEVEL_CRITICAL, DEBUG_TARGET_ALL, 
					("!!!!VolumeInformation  pCCB(%p)\n", pCCB));

	pVCB = pFCB->PtrVCB;
	ASSERT_VCB(pVCB);


	Wait = XIXCORE_TEST_FLAGS(pIrpContext->IrpContextFlags, XIFSD_IRP_CONTEXT_WAIT);
	




	if(!ExAcquireResourceSharedLite(&(pVCB->VCBResource), Wait)){
		DebugTrace(DEBUG_LEVEL_INFO, (DEBUG_TARGET_VOLINFO|DEBUG_TARGET_IRPCONTEXT),
					("PostRequest IrpContext(%p) Irp(%p)\n", pIrpContext, pIrp));
		RC = xixfs_PostRequest(pIrpContext, pIrp);
		return RC;
	}

	try{


		Length = pIrpSp->Parameters.QueryVolume.Length ;


		DebugTrace(DEBUG_LEVEL_INFO, (DEBUG_TARGET_VOLINFO|DEBUG_TARGET_IRPCONTEXT),
					 ("pIrpSp->Parameters.QueryVolume.FsInformationClass (0x%x)\n", 
					 pIrpSp->Parameters.QueryVolume.FsInformationClass));
	

		switch (pIrpSp->Parameters.QueryVolume.FsInformationClass) {

		case FileFsSizeInformation:
		{
	

			RC = xixfs_QueryFsSizeInfo( pIrpContext, pVCB, pIrp->AssociatedIrp.SystemBuffer, Length, &BytesToReturn );
			xixfs_CompleteRequest(pIrpContext, RC, BytesToReturn);
			break;
		}
		case FileFsVolumeInformation:
		{

			RC = xixfs_QueryFsVolumeInfo( pIrpContext, pVCB, pIrp->AssociatedIrp.SystemBuffer, Length, &BytesToReturn );
			xixfs_CompleteRequest(pIrpContext, RC, BytesToReturn);
			break;
		}
		case FileFsDeviceInformation:
		{

			RC = xixfs_QueryFsDeviceInfo( pIrpContext, pVCB, pIrp->AssociatedIrp.SystemBuffer, Length, &BytesToReturn );
			xixfs_CompleteRequest(pIrpContext, RC, BytesToReturn);
			break;
		}
		case FileFsAttributeInformation:
		{

			RC = xixfs_QueryFsAttributeInfo( pIrpContext, pVCB, pIrp->AssociatedIrp.SystemBuffer, Length, &BytesToReturn );
			xixfs_CompleteRequest(pIrpContext, RC, BytesToReturn);
			break;
		}		
		case FileFsFullSizeInformation:
		{
			RC = xixfs_QueryFsFullSizeInfo(pIrpContext, pVCB, pIrp->AssociatedIrp.SystemBuffer, Length, &BytesToReturn);
			xixfs_CompleteRequest(pIrpContext, RC, BytesToReturn);
			break;
		}
		default:
			DebugTrace( DEBUG_LEVEL_ERROR, DEBUG_TARGET_ALL,
				("default Not supported Volume Info %ld\n",pIrpSp->Parameters.QueryVolume.FsInformationClass));
			RC = STATUS_INVALID_PARAMETER;
			xixfs_CompleteRequest(pIrpContext, RC, 0);
		break;
		 }

		

	}finally{
		ExReleaseResourceLite(&(pVCB->VCBResource));
	}
	DebugTrace(DEBUG_LEVEL_TRACE, (DEBUG_TARGET_VOLINFO|DEBUG_TARGET_IRPCONTEXT),
		("Exit xixfs_CommonQueryVolumeInformation \n"));
	return RC;	
}

VOID
DokanCompleteSetInformation(
	__in PIRP_ENTRY		IrpEntry,
	__in PEVENT_INFORMATION EventInfo
	)
{
	PIRP				irp;
	PIO_STACK_LOCATION	irpSp;
	NTSTATUS			status;
	ULONG				info	 = 0;
	PDokanCCB			ccb;
	PDokanFCB			fcb;
	UNICODE_STRING		oldFileName;

	FILE_INFORMATION_CLASS infoClass;

	__try {

		DDbgPrint("==> DokanCompleteSetInformation\n");

		irp = IrpEntry->Irp;
		irpSp = IrpEntry->IrpSp;

		ccb = IrpEntry->FileObject->FsContext2;
		ASSERT(ccb != NULL);

		ExAcquireResourceExclusiveLite(&ccb->Resource, TRUE);

		fcb = ccb->Fcb;
		ASSERT(fcb != NULL);

		ccb->UserContext = EventInfo->Context;

		status = EventInfo->Status;
		info = EventInfo->BufferLength;

		infoClass = irpSp->Parameters.SetFile.FileInformationClass;

		RtlZeroMemory(&oldFileName, sizeof(UNICODE_STRING));

		if (NT_SUCCESS(status)) {
			
			if (infoClass == FileDispositionInformation) {

				if (EventInfo->Delete.DeleteOnClose) {

					if (!MmFlushImageSection(
						&fcb->SectionObjectPointers,
						MmFlushForDelete)) {
						DDbgPrint("  Cannot delete user mapped image\n");
						status = STATUS_CANNOT_DELETE;
					} else {
						ccb->Flags |= DOKAN_DELETE_ON_CLOSE;
						fcb->Flags |= DOKAN_DELETE_ON_CLOSE;
						DDbgPrint("   FileObject->DeletePending = TRUE\n");
						IrpEntry->FileObject->DeletePending = TRUE;
					}

				} else {
					ccb->Flags &= ~DOKAN_DELETE_ON_CLOSE;
					fcb->Flags &= ~DOKAN_DELETE_ON_CLOSE;
					DDbgPrint("   FileObject->DeletePending = FALSE\n");
					IrpEntry->FileObject->DeletePending = FALSE;
				}
			}

			// if rename is executed, reassign the file name
			if(infoClass == FileRenameInformation) {
				PVOID buffer = NULL;

				ExAcquireResourceExclusiveLite(&fcb->Resource, TRUE);

				// this is used to inform rename in the bellow switch case
				oldFileName.Buffer = fcb->FileName.Buffer;
				oldFileName.Length = (USHORT)fcb->FileName.Length;
				oldFileName.MaximumLength = (USHORT)fcb->FileName.Length;

				// copy new file name
				buffer = ExAllocatePool(EventInfo->BufferLength+sizeof(WCHAR));

				if (buffer == NULL) {
					status = STATUS_INSUFFICIENT_RESOURCES;
					ExReleaseResourceLite(&fcb->Resource);
					ExReleaseResourceLite(&ccb->Resource);
					__leave;
				}

				fcb->FileName.Buffer = buffer;

				ASSERT(fcb->FileName.Buffer != NULL);

				RtlZeroMemory(fcb->FileName.Buffer, EventInfo->BufferLength+sizeof(WCHAR));
				RtlCopyMemory(fcb->FileName.Buffer, EventInfo->Buffer, EventInfo->BufferLength);

				fcb->FileName.Length = (USHORT)EventInfo->BufferLength;
				fcb->FileName.MaximumLength = (USHORT)EventInfo->BufferLength;

				ExReleaseResourceLite(&fcb->Resource);
			}
		}
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    }

    NonPagedCcb = Ccb->NonPagedCcb;
    ExAcquireResourceExclusiveLite(&NonPagedCcb->Lock, TRUE);

    if (Ccb->NamedPipeState == FILE_PIPE_DISCONNECTED_STATE || Ccb->NamedPipeState == FILE_PIPE_LISTENING_STATE)
    {
        IoStatus->Status = Ccb->NamedPipeState != FILE_PIPE_DISCONNECTED_STATE ? STATUS_PIPE_LISTENING : STATUS_PIPE_DISCONNECTED;
        ReadOk = TRUE;
        goto Quickie;
    }

    ASSERT((Ccb->NamedPipeState == FILE_PIPE_CONNECTED_STATE) || (Ccb->NamedPipeState == FILE_PIPE_CLOSING_STATE));

    if ((NamedPipeEnd == FILE_PIPE_SERVER_END && Ccb->Fcb->NamedPipeConfiguration == FILE_PIPE_OUTBOUND) ||
        (NamedPipeEnd == FILE_PIPE_CLIENT_END && Ccb->Fcb->NamedPipeConfiguration == FILE_PIPE_INBOUND))
    {
        IoStatus->Status = STATUS_INVALID_PARAMETER;
        ReadOk = TRUE;
        goto Quickie;
    }

    if (NamedPipeEnd == FILE_PIPE_SERVER_END)
    {
        ReadQueue = &Ccb->DataQueue[FILE_PIPE_INBOUND];
    }
    else
    {
        ReadQueue = &Ccb->DataQueue[FILE_PIPE_OUTBOUND];
    }

    EventBuffer = NonPagedCcb->EventBuffer[NamedPipeEnd];

    if (ReadQueue->QueueState == WriteEntries)
    {
        *IoStatus = NpReadDataQueue(ReadQueue,
                                    FALSE,
                                    FALSE,
                                    Buffer,
                                    BufferSize,
                                    Ccb->ReadMode[NamedPipeEnd],
                                    Ccb,
                                    List);
        if (!NT_SUCCESS(IoStatus->Status))
        {
            ReadOk = TRUE;
            goto Quickie;
        }

        ReadOk = TRUE;
        if (EventBuffer) KeSetEvent(EventBuffer->Event, IO_NO_INCREMENT, FALSE);
        goto Quickie;
    }

    if (Ccb->NamedPipeState == FILE_PIPE_CLOSING_STATE)
    {
        IoStatus->Status = STATUS_PIPE_BROKEN;
        ReadOk = TRUE;
        if (EventBuffer) KeSetEvent(EventBuffer->Event, IO_NO_INCREMENT, FALSE);
        goto Quickie;
    }

    if (Ccb->CompletionMode[NamedPipeEnd] == FILE_PIPE_COMPLETE_OPERATION)
    {
        IoStatus->Status = STATUS_PIPE_EMPTY;
        ReadOk = TRUE;
        if (EventBuffer) KeSetEvent(EventBuffer->Event, IO_NO_INCREMENT, FALSE);
        goto Quickie;
    }

    if (!Irp)
    {
        ReadOk = FALSE;
        goto Quickie;
    }

    Status = NpAddDataQueueEntry(NamedPipeEnd,
                                 Ccb,
                                 ReadQueue,
                                 ReadEntries,
                                 Buffered,
                                 BufferSize,
                                 Irp,
                                 NULL,
                                 0);
    IoStatus->Status = Status;
    if (!NT_SUCCESS(Status))
    {
        ReadOk = FALSE;
    }
    else
    {
        ReadOk = TRUE;
        if (EventBuffer) KeSetEvent(EventBuffer->Event, IO_NO_INCREMENT, FALSE);
    }

Quickie:
    ExReleaseResourceLite(&Ccb->NonPagedCcb->Lock);
    return ReadOk;
}

//.........这里部分代码省略.........

   /* Initialize this resource early ... it's used in VfatCleanup */
   ExInitializeResourceLite(&DeviceExt->DirResource);

   DeviceExt->FATFileObject = IoCreateStreamFileObject(NULL, DeviceExt->StorageDevice);
   Fcb = vfatNewFCB(DeviceExt, &NameU);
   if (Fcb == NULL)
   {
      Status = STATUS_INSUFFICIENT_RESOURCES;
      goto ByeBye;
   }
   Ccb = ExAllocateFromNPagedLookasideList(&VfatGlobalData->CcbLookasideList);
   if (Ccb == NULL)
   {
      Status =  STATUS_INSUFFICIENT_RESOURCES;
      goto ByeBye;
   }

   RtlZeroMemory(Ccb, sizeof (VFATCCB));
   DeviceExt->FATFileObject->FsContext = Fcb;
   DeviceExt->FATFileObject->FsContext2 = Ccb;
   DeviceExt->FATFileObject->SectionObjectPointer = &Fcb->SectionObjectPointers;
   DeviceExt->FATFileObject->PrivateCacheMap = NULL;
   DeviceExt->FATFileObject->Vpb = DeviceObject->Vpb;
   Fcb->FileObject = DeviceExt->FATFileObject;

   Fcb->Flags |= FCB_IS_FAT;

   Fcb->RFCB.FileSize.QuadPart = DeviceExt->FatInfo.FATSectors * DeviceExt->FatInfo.BytesPerSector;
   Fcb->RFCB.ValidDataLength = Fcb->RFCB.FileSize;
   Fcb->RFCB.AllocationSize = Fcb->RFCB.FileSize;

   CcInitializeCacheMap(DeviceExt->FATFileObject,
                        (PCC_FILE_SIZES)(&Fcb->RFCB.AllocationSize),
                        TRUE,
                        &VfatGlobalData->CacheMgrCallbacks,
                        Fcb);

   DeviceExt->LastAvailableCluster = 2;
   ExInitializeResourceLite(&DeviceExt->FatResource);

   InitializeListHead(&DeviceExt->FcbListHead);

   VolumeFcb = vfatNewFCB(DeviceExt, &VolumeNameU);
   if (VolumeFcb == NULL)
   {
      Status = STATUS_INSUFFICIENT_RESOURCES;
      goto ByeBye;
   }
   VolumeFcb->Flags = FCB_IS_VOLUME;
   VolumeFcb->RFCB.FileSize.QuadPart = DeviceExt->FatInfo.Sectors * DeviceExt->FatInfo.BytesPerSector;
   VolumeFcb->RFCB.ValidDataLength = VolumeFcb->RFCB.FileSize;
   VolumeFcb->RFCB.AllocationSize = VolumeFcb->RFCB.FileSize;
   DeviceExt->VolumeFcb = VolumeFcb;

   ExAcquireResourceExclusiveLite(&VfatGlobalData->VolumeListLock, TRUE);
   InsertHeadList(&VfatGlobalData->VolumeListHead, &DeviceExt->VolumeListEntry);
   ExReleaseResourceLite(&VfatGlobalData->VolumeListLock);

   /* read serial number */
   DeviceObject->Vpb->SerialNumber = DeviceExt->FatInfo.VolumeID;

   /* read volume label */
   ReadVolumeLabel(DeviceExt,  DeviceObject->Vpb);

   /* read clean shutdown bit status */
   Status = GetNextCluster(DeviceExt, 1, &eocMark);
   if (NT_SUCCESS(Status))
   {
      if (eocMark & DeviceExt->CleanShutBitMask)
      {
         /* unset clean shutdown bit */
         eocMark &= ~DeviceExt->CleanShutBitMask;
         WriteCluster(DeviceExt, 1, eocMark);
         VolumeFcb->Flags |= VCB_CLEAR_DIRTY;
      }
   }
   VolumeFcb->Flags |= VCB_IS_DIRTY;

   FsRtlNotifyVolumeEvent(DeviceExt->FATFileObject, FSRTL_VOLUME_MOUNT);

   Status = STATUS_SUCCESS;
ByeBye:

  if (!NT_SUCCESS(Status))
  {
     // cleanup
     if (DeviceExt && DeviceExt->FATFileObject)
        ObDereferenceObject (DeviceExt->FATFileObject);
     if (Fcb)
        vfatDestroyFCB(Fcb);
     if (Ccb)
        vfatDestroyCCB(Ccb);
     if (DeviceObject)
       IoDeleteDevice(DeviceObject);
     if (VolumeFcb)
        vfatDestroyFCB(VolumeFcb);
  }
  return Status;
}

NTSTATUS
DokanDispatchDeviceControl(__in PDEVICE_OBJECT DeviceObject, __in PIRP Irp)

/*++

Routine Description:

        This device control dispatcher handles IOCTLs.

Arguments:

        DeviceObject - Context for the activity.
        Irp 		 - The device control argument block.

Return Value:

        NTSTATUS

--*/

{
  PDokanVCB vcb;
  PDokanDCB dcb;
  PIO_STACK_LOCATION irpSp;
  NTSTATUS status = STATUS_NOT_IMPLEMENTED;
  ULONG controlCode = 0;
  ULONG outputLength = 0;
  // {DCA0E0A5-D2CA-4f0f-8416-A6414657A77A}
  // GUID dokanGUID = { 0xdca0e0a5, 0xd2ca, 0x4f0f, { 0x84, 0x16, 0xa6, 0x41,
  // 0x46, 0x57, 0xa7, 0x7a } };

  __try {
    Irp->IoStatus.Information = 0;

    irpSp = IoGetCurrentIrpStackLocation(Irp);
    outputLength = irpSp->Parameters.DeviceIoControl.OutputBufferLength;

    controlCode = irpSp->Parameters.DeviceIoControl.IoControlCode;

    if (controlCode != IOCTL_EVENT_WAIT && controlCode != IOCTL_EVENT_INFO &&
        controlCode != IOCTL_KEEPALIVE) {

      DDbgPrint("==> DokanDispatchIoControl\n");
      DDbgPrint("  ProcessId %lu\n", IoGetRequestorProcessId(Irp));
    }

    vcb = DeviceObject->DeviceExtension;
    PrintIdType(vcb);
    if (GetIdentifierType(vcb) == DGL) {
      status = GlobalDeviceControl(DeviceObject, Irp);
      __leave;
    } else if (GetIdentifierType(vcb) == DCB) {
      status = DiskDeviceControl(DeviceObject, Irp);
      __leave;
    } else if (GetIdentifierType(vcb) != VCB) {
      status = STATUS_INVALID_PARAMETER;
      __leave;
    }
    dcb = vcb->Dcb;

    switch (irpSp->Parameters.DeviceIoControl.IoControlCode) {
    case IOCTL_EVENT_WAIT:
      DDbgPrint("  IOCTL_EVENT_WAIT\n");
      status = DokanRegisterPendingIrpForEvent(DeviceObject, Irp);
      break;

    case IOCTL_EVENT_INFO:
      // DDbgPrint("  IOCTL_EVENT_INFO\n");
      status = DokanCompleteIrp(DeviceObject, Irp);
      break;

    case IOCTL_EVENT_RELEASE:
      DDbgPrint("  IOCTL_EVENT_RELEASE\n");
      status = DokanEventRelease(DeviceObject);
      break;

    case IOCTL_EVENT_WRITE:
      DDbgPrint("  IOCTL_EVENT_WRITE\n");
      status = DokanEventWrite(DeviceObject, Irp);
      break;

    case IOCTL_KEEPALIVE:
      DDbgPrint("  IOCTL_KEEPALIVE\n");
      if (dcb->Mounted) {
        ExAcquireResourceExclusiveLite(&dcb->Resource, TRUE);
        DokanUpdateTimeout(&dcb->TickCount, DOKAN_KEEPALIVE_TIMEOUT);
        ExReleaseResourceLite(&dcb->Resource);
        status = STATUS_SUCCESS;
      } else {
        DDbgPrint(" device is not mounted\n");
        status = STATUS_INSUFFICIENT_RESOURCES;
      }
      break;

    case IOCTL_RESET_TIMEOUT:
      status = DokanResetPendingIrpTimeout(DeviceObject, Irp);
      break;

    case IOCTL_GET_ACCESS_TOKEN:
      status = DokanGetAccessToken(DeviceObject, Irp);
//.........这里部分代码省略.........

// start event dispatching
NTSTATUS
DokanEventStart(
    __in PDEVICE_OBJECT DeviceObject,
    __in PIRP Irp
   )
{
	ULONG				outBufferLen;
	ULONG				inBufferLen;
	PVOID				buffer;
	PIO_STACK_LOCATION	irpSp;
	EVENT_START			eventStart;
	PEVENT_DRIVER_INFO	driverInfo;
	PDOKAN_GLOBAL		dokanGlobal;
	PDokanDCB			dcb;
	NTSTATUS			status;
	DEVICE_TYPE			deviceType;
	ULONG				deviceCharacteristics;
	WCHAR				baseGuidString[64];
	GUID				baseGuid = DOKAN_BASE_GUID;
	UNICODE_STRING		unicodeGuid;
	ULONG				deviceNamePos;
	

	DDbgPrint("==> DokanEventStart\n");

	dokanGlobal = DeviceObject->DeviceExtension;
	if (GetIdentifierType(dokanGlobal) != DGL) {
		return STATUS_INVALID_PARAMETER;
	}

	irpSp = IoGetCurrentIrpStackLocation(Irp);

	outBufferLen = irpSp->Parameters.DeviceIoControl.OutputBufferLength;
	inBufferLen = irpSp->Parameters.DeviceIoControl.InputBufferLength;

	if (outBufferLen != sizeof(EVENT_DRIVER_INFO) ||
		inBufferLen != sizeof(EVENT_START)) {
		return STATUS_INSUFFICIENT_RESOURCES;
	}

	RtlCopyMemory(&eventStart, Irp->AssociatedIrp.SystemBuffer, sizeof(EVENT_START));
	driverInfo = Irp->AssociatedIrp.SystemBuffer;

	if (eventStart.UserVersion != DOKAN_DRIVER_VERSION) {
		driverInfo->DriverVersion = DOKAN_DRIVER_VERSION;
		driverInfo->Status = DOKAN_START_FAILED;
		Irp->IoStatus.Status = STATUS_SUCCESS;
		Irp->IoStatus.Information = sizeof(EVENT_DRIVER_INFO);
		return STATUS_SUCCESS;
	}

	deviceCharacteristics = FILE_DEVICE_IS_MOUNTED;

	switch (eventStart.DeviceType) {
	case DOKAN_DISK_FILE_SYSTEM:
		deviceType = FILE_DEVICE_DISK_FILE_SYSTEM;
		break;
	case DOKAN_NETWORK_FILE_SYSTEM:
		deviceType = FILE_DEVICE_NETWORK_FILE_SYSTEM;
		deviceCharacteristics |= FILE_REMOTE_DEVICE;
		break;
	default:
		DDbgPrint("  Unknown device type: %d\n", eventStart.DeviceType);
		deviceType = FILE_DEVICE_DISK_FILE_SYSTEM;
	}

	if (eventStart.Flags & DOKAN_EVENT_REMOVABLE) {
		DDbgPrint("  DeviceCharacteristics |= FILE_REMOVABLE_MEDIA\n");
		deviceCharacteristics |= FILE_REMOVABLE_MEDIA;
	}

	baseGuid.Data2 = (USHORT)(dokanGlobal->MountId & 0xFFFF) ^ baseGuid.Data2;
	baseGuid.Data3 = (USHORT)(dokanGlobal->MountId >> 16) ^ baseGuid.Data3;

	status = RtlStringFromGUID(&baseGuid, &unicodeGuid);
	if (!NT_SUCCESS(status)) {
		return status;
	}
	RtlZeroMemory(baseGuidString, sizeof(baseGuidString));
	RtlStringCchCopyW(baseGuidString, sizeof(baseGuidString) / sizeof(WCHAR), unicodeGuid.Buffer);
	RtlFreeUnicodeString(&unicodeGuid);

	InterlockedIncrement(&dokanGlobal->MountId);

	KeEnterCriticalRegion();
	ExAcquireResourceExclusiveLite(&dokanGlobal->Resource, TRUE);

	status = DokanCreateDiskDevice(
				DeviceObject->DriverObject,
				dokanGlobal->MountId,
				baseGuidString,
				dokanGlobal,
				deviceType,
				deviceCharacteristics,
				&dcb);

	if (!NT_SUCCESS(status)) {
		ExReleaseResourceLite(&dokanGlobal->Resource);
		KeLeaveCriticalRegion();
//.........这里部分代码省略.........

/*
 * @implemented
 */
VOID
NTAPI
IoRegisterFileSystem(IN PDEVICE_OBJECT DeviceObject)
{
    PLIST_ENTRY FsList = NULL;
    PAGED_CODE();

    /* Acquire the FS lock */
    KeEnterCriticalRegion();
    ExAcquireResourceExclusiveLite(&IopDatabaseResource, TRUE);

    /* Check what kind of FS this is */
    if (DeviceObject->DeviceType == FILE_DEVICE_DISK_FILE_SYSTEM)
    {
        /* Use the disk list */
        FsList = &IopDiskFileSystemQueueHead;
    }
    else if (DeviceObject->DeviceType == FILE_DEVICE_NETWORK_FILE_SYSTEM)
    {
        /* Use the network device list */
        FsList = &IopNetworkFileSystemQueueHead;
    }
    else if (DeviceObject->DeviceType == FILE_DEVICE_CD_ROM_FILE_SYSTEM)
    {
        /* Use the CD-ROM list */
        FsList = &IopCdRomFileSystemQueueHead;
    }
    else if (DeviceObject->DeviceType == FILE_DEVICE_TAPE_FILE_SYSTEM)
    {
        /* Use the tape list */
        FsList = &IopTapeFileSystemQueueHead;
    }

    /* Make sure that we have a valid list */
    if (FsList)
    {
        /* Check if we should insert it at the top or bottom of the list */
        if (DeviceObject->Flags & DO_LOW_PRIORITY_FILESYSTEM)
        {
            /* At the bottom */
            InsertTailList(FsList->Blink, &DeviceObject->Queue.ListEntry);
        }
        else
        {
            /* On top */
            InsertHeadList(FsList, &DeviceObject->Queue.ListEntry);
        }
    }

    /* Update operations counter */
    IopFsRegistrationOps++;

    /* Clear the initializing flag */
    DeviceObject->Flags &= ~DO_DEVICE_INITIALIZING;

    /* Notify file systems of the addition */
    IopNotifyFileSystemChange(DeviceObject, TRUE);

    /* Release the FS Lock */
    ExReleaseResourceLite(&IopDatabaseResource);
    KeLeaveCriticalRegion();

    /* Ensure driver won't be unloaded */
    IopInterlockedIncrementUlong(LockQueueIoDatabaseLock, (PULONG)&DeviceObject->ReferenceCount);
}

NTSTATUS
VfatFlushVolume(
    PDEVICE_EXTENSION DeviceExt,
    PVFATFCB VolumeFcb)
{
    PLIST_ENTRY ListEntry;
    PVFATFCB Fcb;
    NTSTATUS Status, ReturnStatus = STATUS_SUCCESS;
    PIRP Irp;
    KEVENT Event;
    IO_STATUS_BLOCK IoStatusBlock;

    DPRINT("VfatFlushVolume(DeviceExt %p, VolumeFcb %p)\n", DeviceExt, VolumeFcb);

    ASSERT(VolumeFcb == DeviceExt->VolumeFcb);

    ListEntry = DeviceExt->FcbListHead.Flink;
    while (ListEntry != &DeviceExt->FcbListHead)
    {
        Fcb = CONTAINING_RECORD(ListEntry, VFATFCB, FcbListEntry);
        ListEntry = ListEntry->Flink;
        if (!vfatFCBIsDirectory(Fcb))
        {
            ExAcquireResourceExclusiveLite(&Fcb->MainResource, TRUE);
            Status = VfatFlushFile(DeviceExt, Fcb);
            ExReleaseResourceLite (&Fcb->MainResource);
            if (!NT_SUCCESS(Status))
            {
                DPRINT1("VfatFlushFile failed, status = %x\n", Status);
                ReturnStatus = Status;
            }
        }
        /* FIXME: Stop flushing if this is a removable media and the media was removed */
    }

    ListEntry = DeviceExt->FcbListHead.Flink;
    while (ListEntry != &DeviceExt->FcbListHead)
    {
        Fcb = CONTAINING_RECORD(ListEntry, VFATFCB, FcbListEntry);
        ListEntry = ListEntry->Flink;
        if (vfatFCBIsDirectory(Fcb))
        {
            ExAcquireResourceExclusiveLite(&Fcb->MainResource, TRUE);
            Status = VfatFlushFile(DeviceExt, Fcb);
            ExReleaseResourceLite (&Fcb->MainResource);
            if (!NT_SUCCESS(Status))
            {
                DPRINT1("VfatFlushFile failed, status = %x\n", Status);
                ReturnStatus = Status;
            }
        }
        /* FIXME: Stop flushing if this is a removable media and the media was removed */
    }

    Fcb = (PVFATFCB) DeviceExt->FATFileObject->FsContext;

    ExAcquireResourceExclusiveLite(&DeviceExt->FatResource, TRUE);
    Status = VfatFlushFile(DeviceExt, Fcb);
    ExReleaseResourceLite(&DeviceExt->FatResource);

    /* Prepare an IRP to flush device buffers */
    Irp = IoBuildSynchronousFsdRequest(IRP_MJ_FLUSH_BUFFERS,
                                       DeviceExt->StorageDevice,
                                       NULL, 0, NULL, &Event,
                                       &IoStatusBlock);
    if (Irp != NULL)
    {
        KeInitializeEvent(&Event, NotificationEvent, FALSE);

        Status = IoCallDriver(DeviceExt->StorageDevice, Irp);
        if (Status == STATUS_PENDING)
        {
            KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
            Status = IoStatusBlock.Status;
        }

        /* Ignore device not supporting flush operation */
        if (Status == STATUS_INVALID_DEVICE_REQUEST)
        {
            DPRINT1("Flush not supported, ignored\n");
            Status = STATUS_SUCCESS;

        }
    }
    else
    {
        Status = STATUS_INSUFFICIENT_RESOURCES;
    }

    if (!NT_SUCCESS(Status))
    {
        DPRINT1("VfatFlushFile failed, status = %x\n", Status);
        ReturnStatus = Status;
    }

    return ReturnStatus;
}

/*
 * @implemented
 */
NTSTATUS
NTAPI
IoRegisterFsRegistrationChange(IN PDRIVER_OBJECT DriverObject,
                               IN PDRIVER_FS_NOTIFICATION DriverNotificationRoutine)
{
    PFS_CHANGE_NOTIFY_ENTRY Entry;
    PAGED_CODE();

    /* Acquire the list lock */
    KeEnterCriticalRegion();
    ExAcquireResourceExclusiveLite(&IopDatabaseResource, TRUE);

    /* Check if that driver is already registered (successive calls)
     * See MSDN note: http://msdn.microsoft.com/en-us/library/ff548499%28v=vs.85%29.aspx
     */
    if (!IsListEmpty(&IopFsNotifyChangeQueueHead))
    {
        Entry = CONTAINING_RECORD(IopFsNotifyChangeQueueHead.Blink,
                                  FS_CHANGE_NOTIFY_ENTRY,
                                  FsChangeNotifyList);

        if (Entry->DriverObject == DriverObject &&
            Entry->FSDNotificationProc == DriverNotificationRoutine)
        {
            /* Release the lock */
            ExReleaseResourceLite(&IopDatabaseResource);

            return STATUS_DEVICE_ALREADY_ATTACHED;
        }
    }

    /* Allocate a notification entry */
    Entry = ExAllocatePoolWithTag(PagedPool,
                                  sizeof(FS_CHANGE_NOTIFY_ENTRY),
                                  TAG_FS_CHANGE_NOTIFY);
    if (!Entry)
    {
        /* Release the lock */
        ExReleaseResourceLite(&IopDatabaseResource);

        return STATUS_INSUFFICIENT_RESOURCES;
    }

    /* Save the driver object and notification routine */
    Entry->DriverObject = DriverObject;
    Entry->FSDNotificationProc = DriverNotificationRoutine;

    /* Insert it into the notification list */
    InsertTailList(&IopFsNotifyChangeQueueHead, &Entry->FsChangeNotifyList);

    /* Start notifying all already present FS */
    IopNotifyAlreadyRegisteredFileSystems(&IopNetworkFileSystemQueueHead, DriverNotificationRoutine, FALSE);
    IopNotifyAlreadyRegisteredFileSystems(&IopCdRomFileSystemQueueHead, DriverNotificationRoutine, TRUE);
    IopNotifyAlreadyRegisteredFileSystems(&IopDiskFileSystemQueueHead, DriverNotificationRoutine, TRUE);
    IopNotifyAlreadyRegisteredFileSystems(&IopTapeFileSystemQueueHead, DriverNotificationRoutine, TRUE);

    /* Release the lock */
    ExReleaseResourceLite(&IopDatabaseResource);
    KeLeaveCriticalRegion();

    /* Reference the driver */
    ObReferenceObject(DriverObject);
    return STATUS_SUCCESS;
}

//.........这里部分代码省略.........

            /* Allocate the IRP */
            Irp = IoAllocateIrp(AttachedDeviceObject->StackSize +
                                (UCHAR)FsStackOverhead,
                                TRUE);
            if (!Irp)
            {
                /* Fail */
                Status =  STATUS_INSUFFICIENT_RESOURCES;
                break;
            }

            /* Setup the IRP */
            Irp->UserIosb = &IoStatusBlock;
            Irp->UserEvent = &Event;
            Irp->Tail.Overlay.Thread = PsGetCurrentThread();
            Irp->Flags = IRP_MOUNT_COMPLETION | IRP_SYNCHRONOUS_PAGING_IO;
            Irp->RequestorMode = KernelMode;

            /* Get the I/O Stack location and set it up */
            StackPtr = IoGetNextIrpStackLocation(Irp);
            StackPtr->MajorFunction = IRP_MJ_FILE_SYSTEM_CONTROL;
            StackPtr->MinorFunction = IRP_MN_MOUNT_VOLUME;
            StackPtr->Flags = AllowRawMount;
            StackPtr->Parameters.MountVolume.Vpb = DeviceObject->Vpb;
            StackPtr->Parameters.MountVolume.DeviceObject =
                AttachedDeviceObject;

            /* Save registration operations */
            RegistrationOps = IopFsRegistrationOps;

            /* Release locks */
            IopInterlockedIncrementUlong(LockQueueIoDatabaseLock, (PULONG)&DeviceObject->ReferenceCount);
            ExReleaseResourceLite(&IopDatabaseResource);

            /* Call the driver */
            Status = IoCallDriver(FileSystemDeviceObject, Irp);
            if (Status == STATUS_PENDING)
            {
                /* Wait on it */
                KeWaitForSingleObject(&Event,
                                      Executive,
                                      KernelMode,
                                      FALSE,
                                      NULL);
                Status = IoStatusBlock.Status;
            }

            ExAcquireResourceSharedLite(&IopDatabaseResource, TRUE);
            IopInterlockedDecrementUlong(LockQueueIoDatabaseLock, (PULONG)&DeviceObject->ReferenceCount);

            /* Check if mounting was successful */
            if (NT_SUCCESS(Status))
            {
                /* Mount the VPB */
                *Vpb = IopMountInitializeVpb(DeviceObject,
                                             AttachedDeviceObject,
                                             (DeviceObject->Vpb->Flags &
                                              VPB_RAW_MOUNT));
            }
            else
            {
                /* Check if we failed because of the user */
                if ((IoIsErrorUserInduced(Status)) &&
                    (IoStatusBlock.Information == 1))
                {

//.........这里部分代码省略.........
                Vcb->PartitionInformation.PartitionLength.QuadPart  ) {
            Irp->IoStatus.Information = 0;
            Status = STATUS_END_OF_FILE;
            __leave;
        }

        if (ByteOffset.QuadPart + Length > Vcb->Header.FileSize.QuadPart) {
            Length = (ULONG)(Vcb->Header.FileSize.QuadPart - ByteOffset.QuadPart);
        }

        /*
         *  User direct volume access
         */

        if (Ccb != NULL && !PagingIo) {

            if (!ExAcquireResourceExclusiveLite(
                        &Vcb->MainResource,
                        IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT) )) {
                Status = STATUS_PENDING;
                __leave;
            }
            MainResourceAcquired = TRUE;

            if (!FlagOn(Ccb->Flags, CCB_VOLUME_DASD_PURGE)) {

                if (!FlagOn(Vcb->Flags, VCB_VOLUME_LOCKED)) {
                    Ext2FlushVolume(IrpContext, Vcb, FALSE);
                }

                SetFlag(Ccb->Flags, CCB_VOLUME_DASD_PURGE);
            }

            ExReleaseResourceLite(&Vcb->MainResource);
            MainResourceAcquired = FALSE;

            /* will do Nocache i/o */
        }

        /*
         *  I/O to volume StreamObject
         */

        if (!Nocache) {

            if (IsFlagOn(IrpContext->MinorFunction, IRP_MN_MDL)) {

                CcMdlRead(
                    Vcb->Volume,
                    &ByteOffset,
                    Length,
                    &Irp->MdlAddress,
                    &Irp->IoStatus );

                Status = Irp->IoStatus.Status;

            } else {

                Buffer = Ext2GetUserBuffer(Irp);
                if (Buffer == NULL) {
                    DbgBreak();
                    Status = STATUS_INVALID_USER_BUFFER;
                    __leave;
                }

                if (!CcCopyRead(

//.........这里部分代码省略.........
                    }
                }
            }

            Status = Ext2LockUserBuffer(
                         IrpContext->Irp,
                         BytesRead,
                         IoReadAccess );

            if (!NT_SUCCESS(Status)) {
                __leave;
            }

            Status = Ext2ReadInode(
                         IrpContext,
                         Vcb,
                         Fcb->Mcb,
                         ByteOffset.QuadPart,
                         NULL,
                         BytesRead,
                         TRUE,
                         NULL );

            /* we need re-queue this request in case STATUS_CANT_WAIT
               and fail it in other failure cases  */
            if (!NT_SUCCESS(Status)) {
                __leave;
            }

            /* pended by low level device */
            if (Status == STATUS_PENDING) {
                IrpContext->Irp = Irp = NULL;
                __leave;
            }

            Irp = IrpContext->Irp;
            ASSERT(Irp);
            Status = Irp->IoStatus.Status;

            if (!NT_SUCCESS(Status)) {
                Ext2NormalizeAndRaiseStatus(IrpContext, Status);
            }
        }

        Irp->IoStatus.Information = ReturnedLength;

    } __finally {

        if (Irp) {
            if (PagingIoResourceAcquired) {
                ExReleaseResourceLite(&Fcb->PagingIoResource);
            }

            if (MainResourceAcquired) {
                ExReleaseResourceLite(&Fcb->MainResource);
            }
        }

        if (!OpPostIrp && !IrpContext->ExceptionInProgress) {

            if (Irp) {
                if ( Status == STATUS_PENDING ||
                     Status == STATUS_CANT_WAIT) {

                    Status = Ext2LockUserBuffer(
                                 IrpContext->Irp,
                                 Length,
                                 IoWriteAccess );

                    if (NT_SUCCESS(Status)) {
                        Status = Ext2QueueRequest(IrpContext);
                    } else {
                        Ext2CompleteIrpContext(IrpContext, Status);
                    }
                } else {
                    if (NT_SUCCESS(Status)) {
                        if (!PagingIo) {
                            if (SynchronousIo) {
                                FileObject->CurrentByteOffset.QuadPart =
                                    ByteOffset.QuadPart + Irp->IoStatus.Information;
                            }
                            FileObject->Flags |= FO_FILE_FAST_IO_READ;
                        }
                    }

                    Ext2CompleteIrpContext(IrpContext, Status);
                }

            } else {

                Ext2FreeIrpContext(IrpContext);
            }
        }
    }

    DEBUG(DL_IO, ("Ext2ReadFile: %wZ fetch at Off=%I64xh Len=%xh Paging=%xh Nocache=%xh Returned=%xh Status=%xh\n",
                  &Fcb->Mcb->ShortName, ByteOffset.QuadPart, Length, PagingIo, Nocache, ReturnedLength, Status));
    return Status;

}

//.........这里部分代码省略.........
                IoGetRequestorProcess(Irp),
                NULL  );

            //
            // If there are no byte range locks owned by other processes on the
            // file the fast I/O read/write functions doesn't have to check for
            // locks so we set IsFastIoPossible to FastIoIsPossible again.
            //
            if (!FsRtlGetNextFileLock(&Fcb->FileLockAnchor, TRUE)) {
                if (Fcb->Header.IsFastIoPossible != FastIoIsPossible) {
                    RfsdPrint((
                        DBG_INFO, ": %-16.16s %-31s %s\n",
                        RfsdGetCurrentProcessName(),
                        "FastIoIsPossible",
                        Fcb->AnsiFileName.Buffer
                        ));

                    Fcb->Header.IsFastIoPossible = FastIoIsPossible;
                }
            }
        }

        if ( IsFlagOn( FileObject->Flags, FO_CACHE_SUPPORTED) &&
             (Fcb->NonCachedOpenCount != 0) &&
             (Fcb->NonCachedOpenCount == Fcb->ReferenceCount) &&
             (Fcb->SectionObject.DataSectionObject != NULL)) {

            if( !IsFlagOn(Vcb->Flags, VCB_READ_ONLY) &&
                !IsFlagOn(Vcb->Flags, VCB_WRITE_PROTECTED)) {
                CcFlushCache(&Fcb->SectionObject, NULL, 0, NULL);
            }

            ExAcquireResourceExclusiveLite(&(Fcb->PagingIoResource), TRUE);
            ExReleaseResourceLite(&(Fcb->PagingIoResource));

            CcPurgeCacheSection( &Fcb->SectionObject,
                                 NULL,
                                 0,
                                 FALSE );
        }

        if (Fcb->OpenHandleCount == 0) {

            if (IsFlagOn(Fcb->Flags, FCB_DELETE_PENDING)) {
                //
                //  Have to delete this file...
                //

#ifdef _MSC_VER
#pragma prefast( suppress: 28137, "by design" )
#endif
                if (!ExAcquireResourceExclusiveLite(
                         &Fcb->PagingIoResource,
                         IrpContext->IsSynchronous
                         )) {
                    Status = STATUS_PENDING;
                    _SEH2_LEAVE;
                }

                FcbPagingIoAcquired = TRUE;
DbgBreak();
#if DISABLED
                Status = RfsdDeleteFile(IrpContext, Vcb, Fcb);

                if (NT_SUCCESS(Status)) {
                    if (IsDirectory(Fcb)) {

NTSTATUS
RegisterPendingIrpMain(__in PDEVICE_OBJECT DeviceObject, __in PIRP Irp,
                       __in ULONG SerialNumber, __in PIRP_LIST IrpList,
                       __in ULONG Flags, __in ULONG CheckMount) {
  PIRP_ENTRY irpEntry;
  PIO_STACK_LOCATION irpSp;
  KIRQL oldIrql;
  PDokanVCB vcb = NULL;

  DDbgPrint("==> DokanRegisterPendingIrpMain\n");

  if (GetIdentifierType(DeviceObject->DeviceExtension) == VCB) {
    vcb = DeviceObject->DeviceExtension;
    if (CheckMount && IsUnmountPendingVcb(vcb)) {
      DDbgPrint(" device is not mounted\n");
      return STATUS_NO_SUCH_DEVICE;
    }
  }

  irpSp = IoGetCurrentIrpStackLocation(Irp);

  // Allocate a record and save all the event context.
  irpEntry = DokanAllocateIrpEntry();

  if (NULL == irpEntry) {
    DDbgPrint("  can't allocate IRP_ENTRY\n");
    return STATUS_INSUFFICIENT_RESOURCES;
  }

  RtlZeroMemory(irpEntry, sizeof(IRP_ENTRY));

  InitializeListHead(&irpEntry->ListEntry);

  irpEntry->SerialNumber = SerialNumber;
  irpEntry->FileObject = irpSp->FileObject;
  irpEntry->Irp = Irp;
  irpEntry->IrpSp = irpSp;
  irpEntry->IrpList = IrpList;
  irpEntry->Flags = Flags;

  // Update the irp timeout for the entry
  if (vcb) {
    ExAcquireResourceExclusiveLite(&vcb->Dcb->Resource, TRUE);
    DokanUpdateTimeout(&irpEntry->TickCount, vcb->Dcb->IrpTimeout);
    ExReleaseResourceLite(&vcb->Dcb->Resource);
  } else {
    DokanUpdateTimeout(&irpEntry->TickCount, DOKAN_IRP_PENDING_TIMEOUT);
  }

  // DDbgPrint("  Lock IrpList.ListLock\n");
  ASSERT(KeGetCurrentIrql() <= DISPATCH_LEVEL);
  KeAcquireSpinLock(&IrpList->ListLock, &oldIrql);

  IoSetCancelRoutine(Irp, DokanIrpCancelRoutine);

  if (Irp->Cancel) {
    if (IoSetCancelRoutine(Irp, NULL) != NULL) {
      // DDbgPrint("  Release IrpList.ListLock %d\n", __LINE__);
      KeReleaseSpinLock(&IrpList->ListLock, oldIrql);

      DokanFreeIrpEntry(irpEntry);

      return STATUS_CANCELLED;
    }
  }

  IoMarkIrpPending(Irp);

  InsertTailList(&IrpList->ListHead, &irpEntry->ListEntry);

  irpEntry->CancelRoutineFreeMemory = FALSE;

  // save the pointer in order to be accessed by cancel routine
  Irp->Tail.Overlay.DriverContext[DRIVER_CONTEXT_IRP_ENTRY] = irpEntry;

  KeSetEvent(&IrpList->NotEmpty, IO_NO_INCREMENT, FALSE);

  // DDbgPrint("  Release IrpList.ListLock\n");
  KeReleaseSpinLock(&IrpList->ListLock, oldIrql);

  DDbgPrint("<== DokanRegisterPendingIrpMain\n");
  return STATUS_PENDING;
}

//.........这里部分代码省略.........
    DDbgPrint("  Mounting on current session only\n");
    mountGlobally = FALSE;
  }

  if (eventStart->Flags & DOKAN_EVENT_FILELOCK_USER_MODE) {
    DDbgPrint("  FileLock in User Mode\n");
    fileLockUserMode = TRUE;
  }

  KeEnterCriticalRegion();
  ExAcquireResourceExclusiveLite(&dokanGlobal->Resource, TRUE);

  DOKAN_CONTROL dokanControl;
  RtlZeroMemory(&dokanControl, sizeof(dokanControl));
  RtlStringCchCopyW(dokanControl.MountPoint, MAXIMUM_FILENAME_LENGTH,
                    L"\\DosDevices\\");
  if (wcslen(eventStart->MountPoint) == 1) {
    dokanControl.MountPoint[12] = towupper(eventStart->MountPoint[0]);
    dokanControl.MountPoint[13] = L':';
    dokanControl.MountPoint[14] = L'\0';
  } else {
    RtlStringCchCatW(dokanControl.MountPoint, MAXIMUM_FILENAME_LENGTH,
                     eventStart->MountPoint);
  }

  DDbgPrint("  Checking for MountPoint %ls \n", dokanControl.MountPoint);
  PMOUNT_ENTRY foundEntry = FindMountEntry(dokanGlobal, &dokanControl, FALSE);
  if (foundEntry != NULL) {
    DDbgPrint("  MountPoint exists already %ls \n", dokanControl.MountPoint);
    driverInfo->DriverVersion = DOKAN_DRIVER_VERSION;
    driverInfo->Status = DOKAN_START_FAILED;
    Irp->IoStatus.Status = STATUS_SUCCESS;
    Irp->IoStatus.Information = sizeof(EVENT_DRIVER_INFO);
    ExReleaseResourceLite(&dokanGlobal->Resource);
    KeLeaveCriticalRegion();
    ExFreePool(eventStart);
    ExFreePool(baseGuidString);
    return STATUS_SUCCESS;
  }

  baseGuid.Data2 = (USHORT)(dokanGlobal->MountId & 0xFFFF) ^ baseGuid.Data2;
  baseGuid.Data3 = (USHORT)(dokanGlobal->MountId >> 16) ^ baseGuid.Data3;

  status = RtlStringFromGUID(&baseGuid, &unicodeGuid);
  if (!NT_SUCCESS(status)) {
    ExReleaseResourceLite(&dokanGlobal->Resource);
    KeLeaveCriticalRegion();
    ExFreePool(eventStart);
    ExFreePool(baseGuidString);
    return status;
  }
  RtlZeroMemory(baseGuidString, 64 * sizeof(WCHAR));
  RtlStringCchCopyW(baseGuidString, 64,
                    unicodeGuid.Buffer);
  RtlFreeUnicodeString(&unicodeGuid);

  InterlockedIncrement((LONG *)&dokanGlobal->MountId);

  status = DokanCreateDiskDevice(
      DeviceObject->DriverObject, dokanGlobal->MountId, eventStart->MountPoint,
      eventStart->UNCName, baseGuidString, dokanGlobal, deviceType,
      deviceCharacteristics, mountGlobally, useMountManager, &dcb);

  if (!NT_SUCCESS(status)) {
    ExReleaseResourceLite(&dokanGlobal->Resource);
    KeLeaveCriticalRegion();