public BitmapData(NTFSVolume volume, FileRecord fileRecord, AttributeRecord attributeRecord, long numberOfUsableBits) : base(volume, fileRecord, attributeRecord)
{
m_numberOfUsableBits = numberOfUsableBits;
}
protected internal virtual void UpdateFileRecord(FileRecord fileRecord)
{
m_mft.UpdateFileRecord(fileRecord);
}
public NTFSFile(NTFSVolume volume, FileRecord fileRecord) : this(volume, fileRecord, String.Empty)
{
}
public override Stream OpenFile(string path, FileMode mode, FileAccess access, FileShare share, FileOptions options)
{
string streamName = GetStreamName(path);
path = GetFilePath(path);
FileRecord fileRecord = null;
AttributeRecord dataRecord = null;
if (mode == FileMode.CreateNew || mode == FileMode.Create || mode == FileMode.OpenOrCreate)
{
bool fileExists = false;
try
{
fileRecord = m_volume.GetFileRecord(path);
fileExists = true;
}
catch (FileNotFoundException)
{
}
catch (DirectoryNotFoundException)
{
}
if (fileExists)
{
if (mode == FileMode.CreateNew)
{
if (streamName == String.Empty)
{
throw new AlreadyExistsException();
}
else
{
dataRecord = fileRecord.GetAttributeRecord(AttributeType.Data, streamName);
if (dataRecord != null)
{
throw new AlreadyExistsException();
}
}
}
if (streamName != String.Empty && dataRecord == null)
{
// We might need to allocate an additional FileRecordSegment so we have to make sure we can extend the MFT if it is full
if (m_volume.NumberOfFreeClusters < m_volume.NumberOfClustersRequiredToExtendMft)
{
throw new DiskFullException();
}
fileRecord.CreateAttributeRecord(AttributeType.Data, streamName);
m_volume.UpdateFileRecord(fileRecord);
}
if (mode == FileMode.Create)
{
mode = FileMode.Truncate;
}
}
else
{
string directoryPath = Path.GetDirectoryName(path);
string fileName = Path.GetFileName(path);
FileRecord directoryRecord = m_volume.GetFileRecord(directoryPath);
fileRecord = m_volume.CreateFile(directoryRecord.BaseSegmentReference, fileName, false);
if (streamName != String.Empty)
{
fileRecord.CreateAttributeRecord(AttributeType.Data, streamName);
m_volume.UpdateFileRecord(fileRecord);
}
}
}
else // Open, Truncate or Append
{
fileRecord = m_volume.GetFileRecord(path);
dataRecord = fileRecord.GetAttributeRecord(AttributeType.Data, streamName);
if (streamName != String.Empty && dataRecord == null)
{
throw new FileNotFoundException(String.Format("The file '{0}' does not contain a stream named '{1}'", path, streamName));
}
}
if (fileRecord.IsDirectory)
{
throw new UnauthorizedAccessException();
}
List <NTFSFileStream> openStreams;
lock (m_openStreams)
{
if (m_openStreams.TryGetValue(fileRecord.BaseSegmentNumber, out openStreams))
{
if ((access & FileAccess.Write) != 0)
{
// Currently we only support opening a file stream for write access if no other stream is opened for that file
throw new SharingViolationException();
}
else if ((access & FileAccess.Read) != 0)
{
foreach (NTFSFileStream openStream in openStreams)
{
if (openStream.CanWrite && ((share & FileShare.Write) == 0))
{
throw new SharingViolationException();
}
}
}
}
else
{
openStreams = new List <NTFSFileStream>();
m_openStreams.Add(fileRecord.BaseSegmentNumber, openStreams);
}
}
NTFSFile file = new NTFSFile(m_volume, fileRecord, streamName);
NTFSFileStream stream = new NTFSFileStream(file, access);
openStreams.Add(stream);
stream.Closed += delegate(object sender, EventArgs e)
{
openStreams.Remove(stream);
if (openStreams.Count == 0)
{
lock (m_openStreams)
{
m_openStreams.Remove(fileRecord.BaseSegmentNumber);
}
}
};
if (mode == FileMode.Truncate)
{
stream.SetLength(0);
}
else if (mode == FileMode.Append)
{
stream.Seek((long)file.Length, SeekOrigin.Begin);
}
return(stream);
}
internal VolumeInformationRecord GetVolumeInformationRecord()
{
FileRecord volumeRecord = m_mft.GetVolumeRecord();
return((VolumeInformationRecord)volumeRecord.GetAttributeRecord(AttributeType.VolumeInformation, String.Empty));
}
public NonResidentAttributeData(NTFSVolume volume, FileRecord fileRecord, NonResidentAttributeRecord attributeRecord)
{
m_volume = volume;
m_fileRecord = fileRecord;
m_attributeRecord = attributeRecord;
}
protected internal void UpdateFileRecord(FileRecord fileRecord)
{
UpdateFileRecord(fileRecord, null);
}
public virtual void MoveFile(FileRecord fileRecord, MftSegmentReference newParentDirectory, string newFileName)
{
// Worst case scenrario: the new parent directory index requires multiple splits.
// We assume IndexData.ExtendGranularity is bigger than or equal to the number of splits.
if (NumberOfFreeClusters < NumberOfClustersRequiredToExtendIndex)
{
throw new DiskFullException();
}
lock (m_mftLock)
{
FileRecord oldParentDirectoryRecord = GetFileRecord(fileRecord.ParentDirectoryReference);
IndexData oldParentDirectoryIndex = new IndexData(this, oldParentDirectoryRecord, AttributeType.FileName);
IndexData newParentDirectoryIndex;
if (fileRecord.ParentDirectoryReference == newParentDirectory)
{
newParentDirectoryIndex = oldParentDirectoryIndex;
}
else
{
FileRecord newParentDirectoryRecord = GetFileRecord(newParentDirectory);
newParentDirectoryIndex = new IndexData(this, newParentDirectoryRecord, AttributeType.FileName);
}
if (newParentDirectoryIndex.ContainsFileName(newFileName))
{
throw new AlreadyExistsException();
}
List <FileNameRecord> fileNameRecords = fileRecord.FileNameRecords;
uint transactionID = m_logClient.AllocateTransactionID();
foreach (FileNameRecord fileNameRecord in fileNameRecords)
{
oldParentDirectoryIndex.RemoveEntry(fileNameRecord.GetBytes());
}
// Windows will not update the dates and FileAttributes in $File_Name as often as their counterparts in $STANDARD_INFORMATION.
DateTime creationTime = fileRecord.StandardInformation.CreationTime;
DateTime modificationTime = fileRecord.StandardInformation.ModificationTime;
DateTime mftModificationTime = fileRecord.StandardInformation.MftModificationTime;
DateTime lastAccessTime = fileRecord.StandardInformation.LastAccessTime;
ulong allocatedLength = fileRecord.FileNameRecord.AllocatedLength;
FileAttributes fileAttributes = fileRecord.StandardInformation.FileAttributes;
ushort packedEASize = fileRecord.FileNameRecord.PackedEASize;
// Windows NTFS v5.1 driver does not usually update the value of the FileSize field belonging to the FileNameRecords that are stored in the FileRecord.
// The driver does update the value during a rename, which is inconsistent file creation and is likely to be incidental rather than intentional.
// We will set the value to 0 to be consistent with file creation.
fileNameRecords = IndexHelper.GenerateFileNameRecords(newParentDirectory, newFileName, fileRecord.IsDirectory, GenerateDosNames, newParentDirectoryIndex, creationTime, modificationTime, mftModificationTime, lastAccessTime, allocatedLength, 0, fileAttributes, packedEASize);
fileRecord.RemoveAttributeRecords(AttributeType.FileName, String.Empty);
foreach (FileNameRecord fileNameRecord in fileNameRecords)
{
FileNameAttributeRecord fileNameAttribute = (FileNameAttributeRecord)fileRecord.CreateAttributeRecord(AttributeType.FileName, String.Empty);
fileNameAttribute.IsIndexed = true;
fileNameAttribute.Record = fileNameRecord;
}
UpdateFileRecord(fileRecord, transactionID);
foreach (FileNameRecord fileNameRecord in fileNameRecords)
{
if (!fileRecord.IsDirectory)
{
fileNameRecord.FileSize = fileRecord.DataRecord.DataLength;
}
newParentDirectoryIndex.AddEntry(fileRecord.BaseSegmentReference, fileNameRecord.GetBytes());
}
m_logClient.WriteForgetTransactionRecord(transactionID);
m_logClient.WriteRestartRecord(true);
}
}
public virtual void MoveFile(FileRecord fileRecord, MftSegmentReference newParentDirectory, string newFileName)
{
// Worst case scenrario: the new parent directory index requires multiple splits
if (NumberOfFreeClusters < 4)
{
throw new DiskFullException();
}
FileRecord oldParentDirectoryRecord = GetFileRecord(fileRecord.ParentDirectoryReference);
m_mftLock.AcquireWriterLock(Timeout.Infinite);
IndexData oldParentDirectoryIndex = new IndexData(this, oldParentDirectoryRecord, AttributeType.FileName);
IndexData newParentDirectoryIndex;
if (fileRecord.ParentDirectoryReference == newParentDirectory)
{
newParentDirectoryIndex = oldParentDirectoryIndex;
}
else
{
FileRecord newParentDirectoryRecord = GetFileRecord(newParentDirectory);
newParentDirectoryIndex = new IndexData(this, newParentDirectoryRecord, AttributeType.FileName);
if (newParentDirectoryIndex.ContainsFileName(newFileName))
{
m_mftLock.ReleaseWriterLock();
throw new AlreadyExistsException();
}
}
List <FileNameRecord> fileNameRecords = fileRecord.FileNameRecords;
uint transactionID = m_logClient.AllocateTransactionID();
foreach (FileNameRecord fileNameRecord in fileNameRecords)
{
oldParentDirectoryIndex.RemoveEntry(fileNameRecord.GetBytes());
}
DateTime creationTime = fileRecord.FileNameRecord.CreationTime;
DateTime modificationTime = fileRecord.FileNameRecord.ModificationTime;
DateTime mftModificationTime = fileRecord.FileNameRecord.MftModificationTime;
DateTime lastAccessTime = fileRecord.FileNameRecord.LastAccessTime;
ulong allocatedLength = fileRecord.FileNameRecord.AllocatedLength;
ulong fileSize = fileRecord.FileNameRecord.FileSize;
FileAttributes fileAttributes = fileRecord.FileNameRecord.FileAttributes;
ushort packedEASize = fileRecord.FileNameRecord.PackedEASize;
fileNameRecords = IndexHelper.GenerateFileNameRecords(newParentDirectory, newFileName, fileRecord.IsDirectory, m_generateDosNames, newParentDirectoryIndex, creationTime, modificationTime, mftModificationTime, lastAccessTime, allocatedLength, fileSize, fileAttributes, packedEASize);
fileRecord.RemoveAttributeRecords(AttributeType.FileName, String.Empty);
foreach (FileNameRecord fileNameRecord in fileNameRecords)
{
FileNameAttributeRecord fileNameAttribute = (FileNameAttributeRecord)fileRecord.CreateAttributeRecord(AttributeType.FileName, String.Empty);
fileNameAttribute.IsIndexed = true;
fileNameAttribute.Record = fileNameRecord;
}
UpdateFileRecord(fileRecord, transactionID);
foreach (FileNameRecord fileNameRecord in fileNameRecords)
{
newParentDirectoryIndex.AddEntry(fileRecord.BaseSegmentReference, fileNameRecord.GetBytes());
}
m_logClient.WriteForgetTransactionRecord(transactionID);
m_logClient.WriteRestartRecord(this.MajorVersion, true);
m_mftLock.ReleaseWriterLock();
}
public NTFSFile(NTFSVolume volume, FileRecord fileRecord)
{
m_volume = volume;
m_fileRecord = fileRecord;
}
public NTFSFile(NTFSVolume volume, MftSegmentReference fileReference)
{
m_volume = volume;
m_fileRecord = m_volume.GetFileRecord(fileReference);
}
public AttributeData(NTFSVolume volume, FileRecord fileRecord, AttributeRecord attributeRecord)
{
m_volume = volume;
m_fileRecord = fileRecord;
m_attributeRecord = attributeRecord;
}
public void UpdateFileRecord(FileRecord fileRecord, uint transactionID)
{
Dictionary <MftSegmentReference, byte[]> undoDictionary = new Dictionary <MftSegmentReference, byte[]>();
foreach (FileRecordSegment segment in fileRecord.Segments)
{
byte[] segmentBytes = segment.GetBytes(m_volume.BytesPerFileRecordSegment, m_volume.MinorVersion, false);
undoDictionary.Add(segment.SegmentReference, segmentBytes);
}
AttributeRecord oldAttributeList = fileRecord.BaseSegment.GetImmediateAttributeRecord(AttributeType.AttributeList, String.Empty);
fileRecord.UpdateSegments(m_volume.BytesPerFileRecordSegment, m_volume.MinorVersion);
FileRecordSegment baseSegment = fileRecord.BaseSegment;
for (int segmentIndex = 1; segmentIndex < fileRecord.Segments.Count; segmentIndex++)
{
FileRecordSegment segment = fileRecord.Segments[segmentIndex];
if (segment.SegmentReference == MftSegmentReference.NullReference)
{
// New segment, we must allocate space for it
MftSegmentReference segmentReference;
if (baseSegment.SegmentNumber == MasterFileTable.MasterFileTableSegmentNumber)
{
segmentReference = AllocateReservedFileRecordSegment(transactionID);
}
else
{
segmentReference = AllocateFileRecordSegment(transactionID);
}
FileRecordSegment newSegment = new FileRecordSegment(segmentReference.SegmentNumber, segmentReference.SequenceNumber, baseSegment.SegmentReference);
newSegment.IsInUse = true;
newSegment.IsDirectory = fileRecord.IsDirectory;
newSegment.NextAttributeInstance = segment.NextAttributeInstance;
newSegment.ImmediateAttributes.AddRange(segment.ImmediateAttributes);
fileRecord.Segments[segmentIndex] = newSegment;
}
else if (segment.ImmediateAttributes.Count == 0)
{
byte[] undoData = undoDictionary[segment.SegmentReference];
ulong streamOffset = (ulong)(segment.SegmentNumber * m_volume.BytesPerFileRecordSegment);
m_volume.LogClient.WriteLogRecord(m_mftRecord.BaseSegmentReference, m_mftRecord.DataRecord, streamOffset, m_volume.BytesPerFileRecordSegment, NTFSLogOperation.DeallocateFileRecordSegment, new byte[0], NTFSLogOperation.InitializeFileRecordSegment, undoData, transactionID);
DeallocateFileRecordSegment(segment, transactionID);
fileRecord.Segments.RemoveAt(segmentIndex);
segmentIndex--;
}
}
for (int segmentIndex = 1; segmentIndex < fileRecord.Segments.Count; segmentIndex++)
{
FileRecordSegment segment = fileRecord.Segments[segmentIndex];
byte[] undoData;
byte[] redoData = segment.GetBytes(m_volume.BytesPerFileRecordSegment, m_volume.MinorVersion, false);
ulong streamOffset = (ulong)(segment.SegmentNumber * m_volume.BytesPerFileRecordSegment);
if (undoDictionary.TryGetValue(segment.SegmentReference, out undoData))
{
m_volume.LogClient.WriteLogRecord(m_mftRecord.BaseSegmentReference, m_mftRecord.DataRecord, streamOffset, m_volume.BytesPerFileRecordSegment, NTFSLogOperation.InitializeFileRecordSegment, redoData, NTFSLogOperation.InitializeFileRecordSegment, undoData, transactionID);
}
else
{
// New segment
m_volume.LogClient.WriteLogRecord(m_mftRecord.BaseSegmentReference, m_mftRecord.DataRecord, streamOffset, m_volume.BytesPerFileRecordSegment, NTFSLogOperation.InitializeFileRecordSegment, redoData, NTFSLogOperation.DeallocateFileRecordSegment, new byte[0], transactionID);
}
UpdateFileRecordSegment(segment);
}
if (oldAttributeList is NonResidentAttributeRecord)
{
new NonResidentAttributeData(m_volume, null, (NonResidentAttributeRecord)oldAttributeList).Truncate(0);
}
bool needsAttributeList = (fileRecord.Segments.Count > 1);
if (needsAttributeList)
{
List <AttributeListEntry> entries = FileRecordHelper.BuildAttributeList(fileRecord.Segments, m_volume.BytesPerFileRecordSegment, m_volume.MinorVersion);
int dataLength = AttributeList.GetLength(entries);
int attributeListRecordLength = ResidentAttributeRecord.GetRecordLength(0, dataLength);
int numberOfBytesFreeInBaseSegment = baseSegment.GetNumberOfBytesFree(m_volume.BytesPerFileRecordSegment, m_volume.MinorVersion);
bool isResident = (attributeListRecordLength <= numberOfBytesFreeInBaseSegment);
AttributeRecord attributeListRecord = baseSegment.CreateAttributeListRecord(isResident);
AttributeList attributeList = new AttributeList(m_volume, attributeListRecord);
attributeList.WriteEntries(entries);
}
byte[] baseRecordUndoData = undoDictionary[baseSegment.SegmentReference];
byte[] baseRecordRedoData = baseSegment.GetBytes(m_volume.BytesPerFileRecordSegment, m_volume.MinorVersion, false);
ulong baseRecordStreamOffset = (ulong)(baseSegment.SegmentNumber * m_volume.BytesPerFileRecordSegment);
m_volume.LogClient.WriteLogRecord(m_mftRecord.BaseSegmentReference, m_mftRecord.DataRecord, baseRecordStreamOffset, m_volume.BytesPerFileRecordSegment, NTFSLogOperation.InitializeFileRecordSegment, baseRecordRedoData, NTFSLogOperation.InitializeFileRecordSegment, baseRecordUndoData, transactionID);
UpdateFileRecordSegment(baseSegment);
}