Re: BSD XFS Port & BSD VFS Rewrite

[Michael Hancock]

> > Have you tried Heidemann's student's stacking layers?  There is one
> > encryption, and one per-file compression with namespace hiding, that
> > I think it would be hard pressed to keep up with.  But I'll give it
> > the benefit of the doubt.  8-).
> 
> Nope. The problem is that while stacking (null, umap, and overlay fs's)
> work, we don't have the coherency issues worked out so that upper layers
> can cache data. i.e. so that the lower fs knows it has to ask the uper
> layers to give pages back. :-) But multiple ls -lR's work fine. :-)

Interesting, have you read the Heidemann paper that outlines a solution
that uses a cache manager?

You can probably find it somewhere here,
http://www.isi.edu/~johnh/SOFTWARE/UCLA_STACKING/





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