/// <summary>
/// Constructs a new USN helper instance
/// </summary>
/// <param name="path">The path to the folder to perform USN services</param>
/// <param name="volumeRoot">The root volume where the USN lookup is performed</param>
internal USNHelper(string path, string volumeRoot)
{
if (Utility.Utility.IsClientLinux)
{
throw new Duplicati.Library.Interface.UserInformationException(Strings.USNHelper.LinuxNotSupportedError, "UsnOnLinuxNotSupported");
}
if (!System.IO.Path.IsPathRooted(path))
{
throw new Exception(string.Format("Path {0} is not rooted", path));
}
m_path = Utility.Utility.AppendDirSeparator(path);
try
{
string devicename = @"\\.\" + System.IO.Path.GetPathRoot(path).TrimEnd('\\');
if (volumeRoot != null)
{
volumeRoot = volumeRoot.TrimEnd('\\');
}
m_volumeHandle = Win32USN.CreateFile(volumeRoot == null ? devicename : volumeRoot, Win32USN.EFileAccess.GenericRead, Win32USN.EFileShare.ReadWrite, IntPtr.Zero, Win32USN.ECreationDisposition.OpenExisting, Win32USN.EFileAttributes.BackupSemantics, IntPtr.Zero);
if (m_volumeHandle == null || m_volumeHandle.IsInvalid)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
uint bytesReturned = 0;
if (!Win32USN.DeviceIoControl(m_volumeHandle, Win32USN.EIOControlCode.FsctlQueryUsnJournal, null, 0, out m_journal, (uint)Marshal.SizeOf(typeof(Win32USN.USN_JOURNAL_DATA)), ref bytesReturned, IntPtr.Zero))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
Win32USN.BY_HANDLE_FILE_INFORMATION fileInfo;
using (SafeFileHandle driveHandle = Win32USN.CreateFile(System.IO.Path.GetPathRoot(path), Win32USN.EFileAccess.GenericRead, Win32USN.EFileShare.ReadWrite, IntPtr.Zero, Win32USN.ECreationDisposition.OpenExisting, Win32USN.EFileAttributes.BackupSemantics, IntPtr.Zero))
if (!Win32USN.GetFileInformationByHandle(driveHandle, out fileInfo))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
m_volumeRootFileNameReferenceNumber = ((ulong)fileInfo.FileIndexHigh << 32) | ((ulong)fileInfo.FileIndexLow);
}
catch
{
if (m_volumeHandle != null)
{
m_volumeHandle.Dispose();
m_volumeHandle = null;
}
throw;
}
if (this.FileSystemEntries.Count == 0)
{
throw new Exception(Strings.USNHelper.SafeGuardError);
}
}
/// <summary>
/// Get NTFS file reference number (FRN) from path
/// </summary>
/// <param name="filePath">Input path</param>
/// <returns>NTFS file reference number</returns>
private static ulong GetFileRefNumber(string filePath)
{
Win32USN.BY_HANDLE_FILE_INFORMATION fileInfo;
using (var driveHandle = Win32USN.CreateFile(filePath, Win32USN.FileAccess.GenericRead,
Win32USN.FileShare.ReadWrite, IntPtr.Zero, Win32USN.CreationDisposition.OpenExisting,
Win32USN.FileAttributes.BackupSemantics, IntPtr.Zero))
{
if (!Win32USN.GetFileInformationByHandle(driveHandle, out fileInfo))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
return(((ulong)fileInfo.FileIndexHigh << 32) | fileInfo.FileIndexLow);
}
