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Extending the Operating System at the User Level: the Ufo Global File System

Albert D. Alexandrov, Maximilian Ibel, Klaus E. Schauser, and Chris J. Scheiman, UCSB

One-line summary: Generalization of JANUS to allow arbitrary user-level OS extensions, in this case for filesystem that supports /http/... and /ftp/... paths directly.

Overview/Main Points


Another technique for extending/customizing the OS, but probably more limited since you can only modify behavior that is accessed by a particular syscall (i.e. can't easily use it to implement policy) and overhead is pretty high.


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