/// <summary>
/// Updates the commit context and writes it to a file, signifying that all
/// the file systems have been provisionally committed.
/// </summary>
/// <returns>The <see cref="Result"/> of the operation.</returns>
public Result CommitProvisionallyDone()
{
IFile contextFile = null;
try
{
Result rc = _fileSystem.OpenFile(out contextFile, CommitContextFileName, OpenMode.ReadWrite);
if (rc.IsFailure())
{
return(rc);
}
_context.State = CommitState.ProvisionallyCommitted;
rc = contextFile.Write(0, SpanHelpers.AsByteSpan(ref _context), WriteOption.None);
if (rc.IsFailure())
{
return(rc);
}
rc = contextFile.Flush();
if (rc.IsFailure())
{
return(rc);
}
}
finally
{
contextFile?.Dispose();
}
return(_fileSystem.Commit());
}
/// <summary>
/// Creates and writes the initial commit context to a file.
/// </summary>
/// <param name="commitCount">The counter.</param>
/// <param name="fileSystemCount">The number of file systems being committed.</param>
/// <returns>The <see cref="Result"/> of the operation.</returns>
public Result Create(long commitCount, int fileSystemCount)
{
IFile contextFile = null;
try
{
// Open context file and create if it doesn't exist
Result rc = _fileSystem.OpenFile(out contextFile, CommitContextFileName, OpenMode.Read);
if (rc.IsFailure())
{
if (!ResultFs.PathNotFound.Includes(rc))
{
return(rc);
}
rc = _fileSystem.CreateFile(CommitContextFileName, CommitContextFileSize, CreateFileOptions.None);
if (rc.IsFailure())
{
return(rc);
}
rc = _fileSystem.OpenFile(out contextFile, CommitContextFileName, OpenMode.Read);
if (rc.IsFailure())
{
return(rc);
}
}
}
finally
{
contextFile?.Dispose();
}
try
{
Result rc = _fileSystem.OpenFile(out contextFile, CommitContextFileName, OpenMode.ReadWrite);
if (rc.IsFailure())
{
return(rc);
}
_context.Version = CurrentCommitContextVersion;
_context.State = CommitState.NotCommitted;
_context.FileSystemCount = fileSystemCount;
_context.Counter = commitCount;
// Write the initial context to the file
rc = contextFile.Write(0, SpanHelpers.AsByteSpan(ref _context), WriteOption.None);
if (rc.IsFailure())
{
return(rc);
}
rc = contextFile.Flush();
if (rc.IsFailure())
{
return(rc);
}
}
finally
{
contextFile?.Dispose();
}
return(_fileSystem.Commit());
}