> > 3. A known ideal solution for this problem is sharing of the cached pages
> > between file systems. We attempted to do it for Tracefs but the
> > resulting code is not beautiful and is potentially racy:
> > <http://marc.theaimsgroup.com/?l=linux-fsdevel&m=113193082115222&w=2>
> > Unfortunately, for fan-out file systems this solution requires even
> > more support from the OS. However, this is what most OSs do
> > (including BSD and Windows) but unfortunately not Linux :-(
>
> VFS-hooks seem to be the cleanest solution not only for a stacked-fs, but
> also for many other situations. It's rather sad that linux hasn't seen the
> light yet.
Jeff Sipek just got his proposal for a paper/discussion topic accepted to
the Linux Storage and Filesystems workshop, co-located with FAST. The
topic for discussion will be what "surgery" the Linux kernel needs to
support stackable file systems properly. I hope it is an indicator that
the situation with support of the stackable file systems in Linux may
improve soon.
Nikolai.
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