public static KernelUpdateLogPage ReadFromDisk(Disk disk, PrivateHeader privateHeader, TOCBlock tocBlock, int kLogIndex)
{
ulong sectorIndex = privateHeader.PrivateRegionStartLBA + tocBlock.LogStart + (uint)kLogIndex;
byte[] sector = disk.ReadSector((long)sectorIndex);
KernelUpdateLogPage result = new KernelUpdateLogPage(sector);
return(result);
}
public static KernelUpdateLog ReadFromDisk(Disk disk, PrivateHeader privateHeader, TOCBlock tocBlock)
{
List <KernelUpdateLogPage> pages = new List <KernelUpdateLogPage>();
KernelUpdateLogPage firstPage = KernelUpdateLogPage.ReadFromDisk(disk, privateHeader, tocBlock, 0);
pages.Add(firstPage);
for (int index = 2; index < firstPage.NumberOfPages; index++)
{
KernelUpdateLogPage page = KernelUpdateLogPage.ReadFromDisk(disk, privateHeader, tocBlock, index);
pages.Add(page);
}
return(new KernelUpdateLog(pages));
}
public static KernelUpdateLogPage ReadFromDisk(Disk disk, PrivateHeader privateHeader, TOCBlock tocBlock, int pageIndex)
{
ulong sectorIndex = privateHeader.PrivateRegionStartLBA + tocBlock.LogStart + (uint)(pageIndex * Length / disk.BytesPerSector);
int pageOffset = (pageIndex * Length) % disk.BytesPerSector;
byte[] sector = disk.ReadSector((long)sectorIndex);
if (pageOffset > 0)
{
sector = ByteReader.ReadBytes(sector, pageOffset, Length);
}
KernelUpdateLogPage result = new KernelUpdateLogPage(sector);
return(result);
}
public void SetLastEntry(Disk disk, PrivateHeader privateHeader, TOCBlock tocBlock, ulong committedTransactionID, ulong pendingTransactionID)
{
if (m_pages.Count > 0)
{
m_pages[0].SetLastEntry(committedTransactionID, pendingTransactionID);
// Windows kernel stores the last committedTransactionID / pendingTransactionID in memory,
// and it will overwrite the values we write as soon as dmadmin is started,
// However, it doesn't seem to cause any issues
KernelUpdateLogPage.WriteToDisk(disk, privateHeader, tocBlock, m_pages[0]);
}
else
{
throw new InvalidOperationException("KLog records have not been previously read from disk");
}
}
public static void WriteToDisk(Disk disk, PrivateHeader privateHeader, TOCBlock tocBlock, KernelUpdateLogPage page)
{
ulong sectorIndex = privateHeader.PrivateRegionStartLBA + tocBlock.LogStart + (uint)(page.PageIndex * Length / disk.BytesPerSector);
int pageOffset = ((int)page.PageIndex * Length) % disk.BytesPerSector;
byte[] pageBytes = page.GetBytes();
if (disk.BytesPerSector > Length)
{
byte[] sectorBytes = disk.ReadSector((long)sectorIndex);
ByteWriter.WriteBytes(sectorBytes, pageOffset, pageBytes);
disk.WriteSectors((long)sectorIndex, sectorBytes);
}
else
{
disk.WriteSectors((long)sectorIndex, pageBytes);
}
}
public static void WriteToDisk(Disk disk, PrivateHeader privateHeader, TOCBlock tocBlock, KernelUpdateLogPage record)
{
ulong sectorIndex = privateHeader.PrivateRegionStartLBA + tocBlock.LogStart + record.PageIndex;
byte[] sector = record.GetBytes();
disk.WriteSectors((long)sectorIndex, sector);
}