public LfsRestartArea(byte[] buffer, int offset)
{
CurrentLsn = LittleEndianConverter.ToUInt64(buffer, offset + 0x00);
ushort logClients = LittleEndianConverter.ToUInt16(buffer, offset + 0x08);
ClientFreeList = LittleEndianConverter.ToUInt16(buffer, offset + 0x0A);
ClientInUseList = LittleEndianConverter.ToUInt16(buffer, offset + 0x0C);
Flags = (LfsRestartFlags)LittleEndianConverter.ToUInt16(buffer, offset + 0x0E);
SeqNumberBits = LittleEndianConverter.ToUInt32(buffer, offset + 0x10);
RestartAreaLength = LittleEndianConverter.ToUInt16(buffer, offset + 0x14);
ushort clientArrayOffset = LittleEndianConverter.ToUInt16(buffer, offset + 0x16);
FileSize = LittleEndianConverter.ToUInt32(buffer, offset + 0x18);
LastLsnDataLength = LittleEndianConverter.ToUInt32(buffer, offset + 0x20);
RecordHeaderLength = LittleEndianConverter.ToUInt16(buffer, offset + 0x24);
LogPageDataOffset = LittleEndianConverter.ToUInt16(buffer, offset + 0x26);
if (clientArrayOffset >= 0x30)
{
RevisionNumber = LittleEndianConverter.ToUInt32(buffer, offset + 0x28);
}
int position = offset + clientArrayOffset;
for (int index = 0; index < logClients; index++)
{
LfsClientRecord clientRecord = new LfsClientRecord(buffer, position);
LogClientArray.Add(clientRecord);
position += clientRecord.Length;
}
}
private LfsRecord WriteRestartRecord(ulong usnJournalUnknown1, ulong previousRestartRecordLsn, MftSegmentReference usnJournal, ulong usnJournalUnknown2, bool isClean)
{
NTFSRestartRecord restartRecord = new NTFSRestartRecord(m_majorVersion, m_minorVersion);
restartRecord.StartOfCheckpointLsn = m_lastClientLsn;
restartRecord.UsnJournalUnknown1 = usnJournalUnknown1;
restartRecord.PreviousRestartRecordLsn = previousRestartRecordLsn;
restartRecord.BytesPerCluster = (uint)Volume.BytesPerCluster;
restartRecord.UsnJournal = usnJournal;
restartRecord.UsnJournalUnknown2 = usnJournalUnknown2;
if (isClean)
{
if (m_transactions.Count > 0)
{
throw new InvalidOperationException("All TransactionIDs must be deallocated before writing a clean restart record");
}
}
else
{
foreach (Transaction transaction in m_transactions)
{
if (transaction.OldestLsn != 0 && transaction.OldestLsn < restartRecord.StartOfCheckpointLsn)
{
restartRecord.StartOfCheckpointLsn = transaction.OldestLsn;
}
}
if (m_openAttributes.Count > 0)
{
byte[] attributeNameTableBytes;
byte[] openAttributeTableBytes = GetOpenAttributeTableBytes(out attributeNameTableBytes);
m_lastClientLsn = 0;
uint transactionID = AllocateTransactionID(); // These records must have a valid transactionID
LfsRecord openAttributeTableRecord = WriteLogRecord(null, null, 0, 0, 0, 0, NTFSLogOperation.OpenAttributeTableDump, openAttributeTableBytes, NTFSLogOperation.Noop, new byte[0], transactionID, false);
restartRecord.OpenAttributeTableLsn = openAttributeTableRecord.ThisLsn;
restartRecord.OpenAttributeTableLength = (uint)openAttributeTableBytes.Length;
if (attributeNameTableBytes != null)
{
LfsRecord attributeNameTableRecord = WriteLogRecord(null, null, 0, 0, 0, 0, NTFSLogOperation.AttributeNamesDump, attributeNameTableBytes, NTFSLogOperation.Noop, new byte[0], transactionID, false);
restartRecord.AttributeNamesLsn = attributeNameTableRecord.ThisLsn;
restartRecord.AttributeNamesLength = (uint)attributeNameTableBytes.Length;
}
DeallocateTransactionID(transactionID);
}
}
byte[] clientData = restartRecord.GetBytes(Volume.MajorVersion);
LfsRecord result = m_logFile.WriteRecord(m_clientIndex, LfsRecordType.ClientRestart, 0, 0, 0, clientData, true);
m_lastClientLsn = result.ThisLsn;
LfsClientRecord clientRecord = m_logFile.GetClientRecord(m_clientIndex);
clientRecord.OldestLsn = restartRecord.StartOfCheckpointLsn;
clientRecord.ClientRestartLsn = result.ThisLsn;
// Note that writing a client restart record without also updating ClientRestartLsn has no effect.
// During the analysis pass, the NTFS v5.1 driver will use ClientRestartLsn in the most recent restart page to determine
// the StartOfCheckpointLsn that the scan should start from, any client restart record that is found during the scan will be ignored.
m_logFile.WriteRestartPage(isClean);
m_currentRestartRecord = restartRecord;
return(result);
}
private LfsRecord WriteRestartRecord(ulong previousRestartRecordLsn, MftSegmentReference usnJournal, ushort majorNTFSVersion, bool isClean)
{
NTFSRestartRecord restartRecord = new NTFSRestartRecord(m_majorVersion, m_minorVersion);
restartRecord.StartOfCheckpointLsn = m_lastClientLsn;
restartRecord.PreviousRestartRecordLsn = previousRestartRecordLsn;
if (isClean)
{
if (m_transactions.Count > 0)
{
throw new InvalidOperationException("All TransactionIDs must be deallocated before writing a clean restart record");
}
}
else if (m_openAttributes.Count > 0)
{
byte[] attributeNameTableBytes;
byte[] openAttributeTableBytes = GetOpenAttributeTableBytes(out attributeNameTableBytes);
m_lastClientLsn = 0;
uint transactionID = AllocateTransactionID(); // These records must have a valid transactionID
LfsRecord openAttributeTableRecord = WriteLogRecord(null, null, 0, NTFSLogOperation.OpenAttributeTableDump, openAttributeTableBytes, NTFSLogOperation.Noop, new byte[0], transactionID);
restartRecord.OpenAttributeTableLsn = openAttributeTableRecord.ThisLsn;
restartRecord.OpenAttributeTableLength = (uint)openAttributeTableBytes.Length;
if (attributeNameTableBytes != null)
{
LfsRecord attributeNameTableRecord = WriteLogRecord(null, null, 0, NTFSLogOperation.AttributeNamesDump, openAttributeTableBytes, NTFSLogOperation.Noop, new byte[0], transactionID);
restartRecord.AttributeNamesLsn = attributeNameTableRecord.ThisLsn;
restartRecord.AttributeNamesLength = (uint)attributeNameTableBytes.Length;
}
DeallocateTransactionID(transactionID);
}
restartRecord.BytesPerCluster = (uint)Volume.BytesPerCluster;
restartRecord.UsnJournal = usnJournal;
byte[] clientData = restartRecord.GetBytes(majorNTFSVersion);
LfsRecord result = m_logFile.WriteRecord(m_clientIndex, LfsRecordType.ClientRestart, 0, 0, 0, clientData);
m_lastClientLsn = result.ThisLsn;
LfsClientRecord clientRecord = m_logFile.GetClientRecord(m_clientIndex);
if (isClean)
{
clientRecord.OldestLsn = restartRecord.StartOfCheckpointLsn;
}
else
{
ulong oldestLsn = restartRecord.StartOfCheckpointLsn;
foreach (Transaction transaction in m_transactions)
{
if (transaction.OldestLsn != 0 && transaction.OldestLsn < oldestLsn)
{
oldestLsn = transaction.OldestLsn;
}
}
clientRecord.OldestLsn = oldestLsn;
}
clientRecord.ClientRestartLsn = result.ThisLsn;
m_logFile.WriteRestartPage(isClean);
return(result);
}
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 static void WriteLogFile(Volume volume, long logFileStartSector, long logFileSize, int bytesPerLogPage)
{
const int BytesPerSystemPage = 4096;
LfsClientRecord ntfsClientRecord = new LfsClientRecord(NTFSLogClient.ClientName);
LfsRestartPage restartPage = LfsRestartPage.Create(logFileSize, BytesPerSystemPage, bytesPerLogPage, ntfsClientRecord);
long secondRestartPageStartSector = logFileStartSector + BytesPerSystemPage / volume.BytesPerSector;
long firstRecordPageStartSector = logFileStartSector + 2 * BytesPerSystemPage / volume.BytesPerSector;
byte[] restartPageBytes = restartPage.GetBytes(BytesPerSystemPage, true);
volume.WriteSectors(logFileStartSector, restartPageBytes);
volume.WriteSectors(secondRestartPageStartSector, restartPageBytes);
byte[] recordPagesBytes = new byte[logFileSize - 2 * BytesPerSystemPage];
for (int index = 0; index < recordPagesBytes.Length; index += 4)
{
LittleEndianWriter.WriteUInt32(recordPagesBytes, index, LfsRecordPage.UninitializedPageSignature);
}
volume.WriteSectors(firstRecordPageStartSector, recordPagesBytes);
}
