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[Gnu-arch-users] Re: give us a hand with arch


From: Pau Aliagas
Subject: [Gnu-arch-users] Re: give us a hand with arch
Date: Sun, 28 Sep 2003 09:54:31 +0200 (CEST)

On Sun, 28 Sep 2003, Florian Weimer wrote:

> On Sat, Sep 27, 2003 at 02:19:37PM -0700, David Brown wrote:
> 
> > Have you seen plasticFS
> > <http://plasticfs.sourceforge.net/plasticfs.html> by Peter Miller.  It
> > does shadow directories at user level on systems that support
> > LD_PRELOAD.  Actually, it currently works on GNU libc systems, but I
> > have heard of people working on getting it to work elsewhere.
> 
> Newer versions of GNU libc have to be recompiled before you can use them
> with PlasticFS, IIRC.

In user-mode-linux there's something called COW filesystems(copy-on-write).
See http://user-mode-linux.sourceforge.net/UserModeLinux-HOWTO-7.html

It looks like the perfect solution for this problem: you share the 
filesystem data til you change it and perform the write. You still share 
the unmodified parts, but the new ones are stored in a COW file.

Pau





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