We have a 95% finished filesystem for linux which involves transactions and journalling for small sized mediums (CF for example)
The final thing that is missing is completing the transactions code(the low-level is done, only the high level is unfinished), and modifying the code so it can compile in a monolithic kernel(since it's currently only as a module) + probably some bugfixing.
The transactions we are speaking about is that the filesystem will atomically write modifications on multiple files in one pass or not at all. Like mentioned the low level part is already written since it's used also with the other parts of the filesystem. There will be access to our developer wich made the code for any questions regarding the code (he is currently working on a higher priority code, and will probably be busy for a while, that's why we are trying to get the job done this way).
For any questions contact us freely!
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Linux 2.4, kernel module and monolithic.