changes-only filesystem

[Tzafrir Cohen]

On Sun, Sep 25, 2011 at 02:07:30PM +0300, Baruch Siach wrote:
> Hi Erez,
> 
> On Sun, Sep 25, 2011 at 01:19:18PM +0300, Erez D wrote:
> > There used to be a filesystem which one would mount over a read-only
> > filesystem, and that filesystem would only hold the changes.
> > 
> > anyone remembers which filesystem it was ?
> 
> See http://en.wikipedia.org/wiki/UnionFS. This feature is not in the mainline 
> Linux kernel yet. See also http://lwn.net/Kernel/Index/, under 
> Filesystems/Union.

While not in mainline, the standard Debian kernel includes aufs that is
used by e.g. the Debian live CD.

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