/// <summary>[AlphaFS] Creates an NTFS directory junction (similar to CMD command: "MKLINK /J").</summary>
internal static void CreateDirectoryJunction(SafeFileHandle safeHandle, string directoryPath)
{
var targetDirBytes = Encoding.Unicode.GetBytes(Path.NonInterpretedPathPrefix + Path.GetRegularPathCore(directoryPath, GetFullPathOptions.AddTrailingDirectorySeparator, false));
var header = new NativeMethods.ReparseDataBufferHeader
{
ReparseTag = ReparsePointTag.MountPoint,
ReparseDataLength = (ushort)(targetDirBytes.Length + 12)
};
var mountPoint = new NativeMethods.MountPointReparseBuffer
{
SubstituteNameOffset = 0,
SubstituteNameLength = (ushort)targetDirBytes.Length,
PrintNameOffset = (ushort)(targetDirBytes.Length + UnicodeEncoding.CharSize),
PrintNameLength = 0
};
var reparseDataBuffer = new NativeMethods.REPARSE_DATA_BUFFER
{
ReparseTag = header.ReparseTag,
ReparseDataLength = header.ReparseDataLength,
SubstituteNameOffset = mountPoint.SubstituteNameOffset,
SubstituteNameLength = mountPoint.SubstituteNameLength,
PrintNameOffset = mountPoint.PrintNameOffset,
PrintNameLength = mountPoint.PrintNameLength,
PathBuffer = new byte[NativeMethods.MAXIMUM_REPARSE_DATA_BUFFER_SIZE - 16] // 16368
};
targetDirBytes.CopyTo(reparseDataBuffer.PathBuffer, 0);
using (var safeBuffer = new SafeGlobalMemoryBufferHandle(Marshal.SizeOf(reparseDataBuffer)))
{
safeBuffer.StructureToPtr(reparseDataBuffer, false);
uint bytesReturned;
var succes = NativeMethods.DeviceIoControl2(safeHandle, NativeMethods.FSCTL_SET_REPARSE_POINT, safeBuffer, (uint)(targetDirBytes.Length + 20), IntPtr.Zero, 0, out bytesReturned, IntPtr.Zero);
var lastError = Marshal.GetLastWin32Error();
if (!succes)
{
NativeError.ThrowException(lastError, directoryPath);
}
}
}
/// <summary>[AlphaFS] Deletes an NTFS directory junction.</summary>
internal static void DeleteDirectoryJunction(SafeFileHandle safeHandle)
{
var reparseDataBuffer = new NativeMethods.REPARSE_DATA_BUFFER
{
ReparseTag = ReparsePointTag.MountPoint,
ReparseDataLength = 0,
PathBuffer = new byte[NativeMethods.MAXIMUM_REPARSE_DATA_BUFFER_SIZE - 16] // 16368
};
using (var safeBuffer = new SafeGlobalMemoryBufferHandle(Marshal.SizeOf(reparseDataBuffer)))
{
safeBuffer.StructureToPtr(reparseDataBuffer, false);
uint bytesReturned;
var success = NativeMethods.DeviceIoControl2(safeHandle, NativeMethods.FSCTL_DELETE_REPARSE_POINT, safeBuffer, NativeMethods.REPARSE_DATA_BUFFER_HEADER_SIZE, IntPtr.Zero, 0, out bytesReturned, IntPtr.Zero);
var lastError = Marshal.GetLastWin32Error();
if (!success)
{
NativeError.ThrowException(lastError);
}
}
}
