Logfs

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Logfs is a new flash-based file system currently under development. The main author is Jörn Engel.

There are early design documents at http://wh.fh-wedel.de/~joern/logfs.pdf.

Later additions not covered in that document include:

  • block compression,
  • jffs2-style subblock writes in the journal,
  • advanced block allocation methods to separate write-once data from write-often data.
  • block caching (useful for metadata)
  • delta storage - having an on-flash cache of recent changes without updating the wandering tree yet.