public List <TransactionEntry> ReadTransactionTable(NTFSRestartRecord restartRecord)
{
ulong transactionTableLsn = restartRecord.TransactionTableLsn;
if (transactionTableLsn != 0)
{
NTFSLogRecord record = ReadLogRecord(transactionTableLsn);
if (record.RedoOperation != NTFSLogOperation.TransactionTableDump)
{
string message = String.Format("Restart record TransactionTableLsn points to a record with RedoOperation {0}", record.RedoOperation);
throw new InvalidDataException(message);
}
if (restartRecord.TransactionTableLength != record.RedoData.Length)
{
throw new InvalidDataException("Transcation table length does not match restart record");
}
return(RestartTableHelper.ReadTable <TransactionEntry>(record.RedoData, restartRecord.MajorVersion));
}
else
{
return(null);
}
}
public List <AttributeNameEntry> ReadAttributeNamesTable(NTFSRestartRecord restartRecord)
{
ulong attributeNamesLsn = restartRecord.AttributeNamesLsn;
if (attributeNamesLsn != 0)
{
NTFSLogRecord record = ReadLogRecord(attributeNamesLsn);
if (record.RedoOperation != NTFSLogOperation.AttributeNamesDump)
{
string message = String.Format("Restart record AttributeNamesLsn points to a record with RedoOperation {0}", record.RedoOperation);
throw new InvalidDataException(message);
}
if (restartRecord.AttributeNamesLength != record.RedoData.Length)
{
throw new InvalidDataException("Open attribute table length does not match restart record");
}
return(AttributeNameEntry.ReadTable(record.RedoData));
}
else
{
return(null);
}
}
private LfsRecord WriteLogRecord(NTFSLogRecord ntfsLogRecord, uint transactionID, bool flushToDisk)
{
LfsClientRecord clientRecord = m_logFile.GetClientRecord(m_clientIndex);
byte[] clientData = ntfsLogRecord.GetBytes();
int transactionIndex = IndexOfTransaction(transactionID);
ulong lastLsnToUndo = m_transactions[transactionIndex].LastLsnToUndo;
LfsRecord result = m_logFile.WriteRecord(m_clientIndex, LfsRecordType.ClientRecord, m_lastClientLsn, lastLsnToUndo, transactionID, clientData, flushToDisk);
m_lastClientLsn = result.ThisLsn;
m_transactions[transactionIndex].LastLsnToUndo = result.ThisLsn;
if (m_transactions[transactionIndex].OldestLsn == 0)
{
m_transactions[transactionIndex].OldestLsn = result.ThisLsn;
}
return(result);
}
private LfsRecord WriteLogRecord(int openAttributeOffset, ulong streamOffset, int recordOffset, int attributeOffset, List <long> lcnList, NTFSLogOperation redoOperation, byte[] redoData, NTFSLogOperation undoOperation, byte[] undoData, uint transactionID, bool flushToDisk)
{
NTFSLogRecord ntfsLogRecord = new NTFSLogRecord();
ntfsLogRecord.TargetAttributeOffset = (ushort)openAttributeOffset;
ntfsLogRecord.RedoOperation = redoOperation;
ntfsLogRecord.RedoData = redoData;
ntfsLogRecord.UndoOperation = undoOperation;
ntfsLogRecord.UndoData = undoData;
ntfsLogRecord.TargetVCN = (long)(streamOffset / (uint)Volume.BytesPerCluster);
ntfsLogRecord.LCNsForPage.AddRange(lcnList);
int offsetInCluster = (int)(streamOffset % (uint)Volume.BytesPerCluster);
ntfsLogRecord.RecordOffset = (ushort)recordOffset;
ntfsLogRecord.AttributeOffset = (ushort)attributeOffset;
ntfsLogRecord.ClusterBlockOffset = (ushort)(offsetInCluster / NTFSLogRecord.BytesPerLogBlock);
return(WriteLogRecord(ntfsLogRecord, transactionID, flushToDisk));
}
public LfsRecord WriteForgetTransactionRecord(uint transactionID, bool flushToDisk)
{
NTFSLogRecord ntfsLogRecord = new NTFSLogRecord();
ntfsLogRecord.RedoOperation = NTFSLogOperation.ForgetTransaction;
ntfsLogRecord.UndoOperation = NTFSLogOperation.CompensationLogRecord;
LfsRecord result = WriteLogRecord(ntfsLogRecord, transactionID, flushToDisk);
DeallocateTransactionID(transactionID);
// Update the open attribute table and remove any open attribute that no longer has an associated transaction
for (int index = 0; index < m_openAttributes.Count; index++)
{
OpenAttribute openAttribute = m_openAttributes[index];
openAttribute.AssociatedTransactions.Remove(transactionID);
if (openAttribute.AssociatedTransactions.Count == 0)
{
m_openAttributes.RemoveAt(index);
index--;
}
}
return(result);
}
public List <NTFSLogRecord> FindRecordsToRedo()
{
NTFSRestartRecord restartRecord = ReadCurrentRestartRecord();
List <DirtyPageEntry> dirtyPageTable = ReadDirtyPageTable(restartRecord);
ulong redoLsn = FindRedoLsn(dirtyPageTable);
LfsRecord firstRecord = m_logFile.ReadRecord(redoLsn);
List <LfsRecord> records = m_logFile.FindNextRecords(redoLsn, m_clientIndex);
records.Insert(0, firstRecord);
List <NTFSLogRecord> result = new List <NTFSLogRecord>();
foreach (LfsRecord record in records)
{
if (record.RecordType == LfsRecordType.ClientRecord)
{
NTFSLogRecord clientRecord = new NTFSLogRecord(record.Data);
switch (clientRecord.RedoOperation)
{
case NTFSLogOperation.Noop:
case NTFSLogOperation.OpenAttributeTableDump:
case NTFSLogOperation.AttributeNamesDump:
case NTFSLogOperation.DirtyPageTableDump:
case NTFSLogOperation.TransactionTableDump:
{
continue;
}
default:
{
result.Add(clientRecord);
break;
}
}
}
}
return(result);
}
