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SubjectRe: Overlay writable filesystem over r/o partition [long]
> I've been thinking about a number of ways to implement
> an ``overlay'' filesystem for Linux -- a filesystem
> that you could mount over ordinary r/o media like CD-ROMs
> and NFS r/o partitions, which would allow you to write
> and just store the diffs to the original data.

Someone did something like this awhile back:

http://sunsite.unc.edu/pub/Linux/system/filesystems/ifs-5.1a-module-for-1.1.88.gz
___
Trevor Johnson


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