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From: Herbert Poetzl (herbert_at_13thfloor.at)
Date: Wed 18 Jun 2003 - 16:20:42 BST


On Wed, Jun 18, 2003 at 05:11:17AM +0000, ragnar_at_this.is wrote:
> Hi,
>
> > anyway, there is something called IMMUTABLE-LINK-INVERSION
>
> >From - vserver 0.6 changes log
> http://www.solucorp.qc.ca/changes.hc?projet=vserver&version=0.6
> it looks like this is now part of the ctx patch
> but probably only for ext2

hmm, currently ext2, ext3 and reiserfs are
supported, jfs is broken, rest unknown ...

> Does anyone maintain the modified e2fsprogs package?
> Sam's patch is for version 1.25.

maybe a fs independant solution would be
advantageous ... Sam?

> > it can be used, although it's not copy on write, as you
> > will know now ...
>
> copy on write would be better, then one could blindly unify
> all files that are the same. If you can work that out, e.g.
> using VFS or something you would make many people happy.

please, before you start implementing it *G*
have a look at http://www.13thfloor.at/TBVFS/

> Interesting comment from
> GCFS: a Garbage-Collected Filesystem for Linux
> http://www.eleves.ens.fr:8080/home/madore/linux/gcfs/
> .....
> This “copy on write” idea is also completely independent
> from the GCFS. I should be asking myself whether it could
> be implemented in a traditional (gc-less) filesystem, but
> every time I try to think about this question,
> my mind seems to go bezerk.
> .....
>
> > > If I knew the APIs, I'd be happy to write such a tool myself.
>
> You can look at:
> fdupes - install with dselect
>
> or a perl script fast-dupemerge
> http://www.furryterror.org/~zblaxell/dupemerge/

hmm, maybe I should release my fsum utility
(this could speed up file hashing)

thanks for the additional infos/links ...

best,
Herbert

> > there where several proposals, and as far as I remember
> > Sam is actually maintaining (at least from time to time)
> > a tool to unify on debian and similar systems ...
>
> I found unify-dirs at
> http://mirrors.paul.sladen.org/sam.vilain.net/vserver/
>
> ---
> Also interesting to look at User-mode Linux
>
> -- Sharing Filesystems between Virtual Machines
> http://user-mode-linux.sourceforge.net/shared_fs.html
>
> -- Host file access
> http://user-mode-linux.sourceforge.net/hostfs.html
>
> best
> ragnar


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