private FileRecord ReadMftRecord(bool useMftMirror, bool readMftMirror)
{
NTFSBootRecord bootRecord = m_volume.BootRecord;
long mftStartLCN = useMftMirror ? (long)bootRecord.MftMirrorStartLCN : (long)bootRecord.MftStartLCN;
long mftSegmentNumber = readMftMirror ? MftMirrorSegmentNumber : MasterFileTableSegmentNumber;
FileRecordSegment mftRecordSegment;
try
{
mftRecordSegment = ReadMftRecordSegment(mftStartLCN, mftSegmentNumber);
}
catch (InvalidDataException)
{
throw new InvalidDataException("Invalid MFT base record segment");
}
if (!mftRecordSegment.IsBaseFileRecord)
{
throw new InvalidDataException("Invalid MFT file record, MFT segment number did not correspond to a base file record segment");
}
AttributeRecord attributeListRecord = mftRecordSegment.GetImmediateAttributeRecord(AttributeType.AttributeList, String.Empty);
if (attributeListRecord == null)
{
return(new FileRecord(mftRecordSegment));
}
else
{
AttributeList attributeList = new AttributeList(m_volume, attributeListRecord);
List <AttributeListEntry> entries = attributeList.ReadEntries();
List <MftSegmentReference> references = AttributeList.GetSegmentReferenceList(entries);
int baseSegmentIndex = MftSegmentReference.IndexOfSegmentNumber(references, MasterFileTableSegmentNumber);
if (baseSegmentIndex >= 0)
{
references.RemoveAt(baseSegmentIndex);
}
List <FileRecordSegment> recordSegments = new List <FileRecordSegment>();
// we want the base record segment first
recordSegments.Add(mftRecordSegment);
foreach (MftSegmentReference reference in references)
{
FileRecordSegment segment;
try
{
segment = ReadMftRecordSegment(mftStartLCN, reference);
}
catch (InvalidDataException)
{
throw new InvalidDataException("Invalid MFT file record, referenced segment is invalid");
}
recordSegments.Add(segment);
}
return(new FileRecord(recordSegments));
}
}
private FileRecord ReadMftRecord(bool useMftMirror, bool readMftMirror)
{
NTFSBootRecord bootRecord = m_volume.BootRecord;
if (bootRecord != null)
{
long mftStartLCN = useMftMirror ? (long)bootRecord.MftMirrorStartLCN : (long)bootRecord.MftStartLCN;
long mftSegmentNumber = readMftMirror ? MftMirrorSegmentNumber : MasterFileTableSegmentNumber;
FileRecordSegment mftRecordSegment = ReadFileRecordSegment(mftStartLCN, mftSegmentNumber);
if (!mftRecordSegment.IsBaseFileRecord)
{
throw new InvalidDataException("Invalid MFT record, not a base record");
}
AttributeRecord attributeListRecord = mftRecordSegment.GetImmediateAttributeRecord(AttributeType.AttributeList, String.Empty);
if (attributeListRecord == null)
{
return(new FileRecord(mftRecordSegment));
}
else
{
// I have never personally seen an MFT with an attribute list
AttributeList attributeList = new AttributeList(m_volume, attributeListRecord);
List <AttributeListEntry> entries = attributeList.ReadEntries();
List <MftSegmentReference> references = AttributeList.GetSegmentReferenceList(entries);
int baseSegmentIndex = MftSegmentReference.IndexOfSegmentNumber(references, MasterFileTableSegmentNumber);
if (baseSegmentIndex >= 0)
{
references.RemoveAt(baseSegmentIndex);
}
List <FileRecordSegment> recordSegments = new List <FileRecordSegment>();
// we want the base record segment first
recordSegments.Add(mftRecordSegment);
foreach (MftSegmentReference reference in references)
{
FileRecordSegment segment = ReadFileRecordSegment(mftStartLCN, reference);
if (segment != null)
{
recordSegments.Add(segment);
}
else
{
throw new InvalidDataException("Invalid MFT record, missing segment");
}
}
return(new FileRecord(recordSegments));
}
}
else
{
return(null);
}
}
public FileRecord GetFileRecord(long baseSegmentNumber)
{
FileRecordSegment baseSegment = GetFileRecordSegment(baseSegmentNumber);
if (baseSegment != null && baseSegment.IsBaseFileRecord)
{
AttributeRecord attributeListRecord = baseSegment.GetImmediateAttributeRecord(AttributeType.AttributeList, String.Empty);
if (attributeListRecord == null)
{
return(new FileRecord(baseSegment));
}
else
{
// The attribute list contains entries for every attribute the record has (excluding the attribute list),
// including attributes that reside within the base record segment.
AttributeList attributeList = new AttributeList(m_volume, attributeListRecord);
List <AttributeListEntry> entries = attributeList.ReadEntries();
List <MftSegmentReference> references = AttributeList.GetSegmentReferenceList(entries);
int baseSegmentIndex = MftSegmentReference.IndexOfSegmentNumber(references, baseSegmentNumber);
if (baseSegmentIndex >= 0)
{
references.RemoveAt(baseSegmentIndex);
}
List <FileRecordSegment> recordSegments = new List <FileRecordSegment>();
// we want the base record segment first
recordSegments.Add(baseSegment);
foreach (MftSegmentReference reference in references)
{
FileRecordSegment segment = GetFileRecordSegment(reference);
if (segment != null)
{
recordSegments.Add(segment);
}
else
{
// record is invalid
return(null);
}
}
return(new FileRecord(recordSegments));
}
}
else
{
return(null);
}
}
public void UpdateFileRecord(FileRecord fileRecord)
{
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();
}
else
{
segmentReference = AllocateFileRecordSegment();
}
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)
{
DeallocateFileRecordSegment(segment);
fileRecord.Segments.RemoveAt(segmentIndex);
segmentIndex--;
}
}
foreach (FileRecordSegment segment in fileRecord.Segments)
{
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);
UpdateFileRecordSegment(baseSegment);
}
}
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);
}
