> > 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. - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
