Hans
Albert D. Cahalan writes:
> Acy James Stapp writes:
>
> > "Reparse points" or filters could be even more easily (and perhaps
> > more fruitfully) implemented as part of the standard library.
>
> It is amazing how the sub-file issues resemble sub-process issues.
> Threads could be more easily implemented as part of libc, but
> performance and correctness would suffer.
>
> > This introduces another directory access on every open (to
> > see if a directory has an .albod entry and hence should be treated
> > as a file) even for non-albod aware apps. This might be a noticeable
> > performance hit for certain apps.
>
> No kidding. You won't use this. I won't use this. Nobody will use this.
> I think you are proposing "solutions" to brush away the problem.
>
> > Other advantages of a user-space implementation are fewer
> > security concerns and portability to other OSs.
>
> Fewer security concerns? When a setuid app runs a user-space filter...
> (and it must, since the system won't work otherwise)
>
> > However, the above directory structure wouldn't allow a file to
> > impersonate a directory.
>
> There goes the correctness.
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