Re: [RFC] Filesystem with multiple mount-points

[GNU/Dizzy]

On Sun, 2 May 2004, Guennadi Liakhovetski wrote:

> Hi
Hi

> 
> Disclaimer: I am not a filesystem expert, so, what's below might be
> absolute nonsense.
> 
> There are systems, where it is desirable to make some partitions,
> possibly, including root, read-only, and some other, like, e.g., /var,
> /home, /lib/modules read-writable. Those writable filesystems may be quite
> small, so, putting them on separate partitions creates too much overhead
> for filesystem metadata, journals... Making those directories soft-links
> into one writable partition would work, but is not too nice.
> 
> So, how about adding a multiple mount-point option to some filesystem?
> They would share metadata, journals, would be represented by several
> directory-trees, and be mountable with, e.g.

How about mounting the big volume somewhere and using -o bind to mount 
some paths within it in different places of your needs ? I know that -o 
bind doesnt honor -o ro yet but if you really needed maybe you can make a 
patch for that, I for one would be very interested about that.
check "man mount" about more information about "bind"

Also notice that linux (starting with some 2.3.x version if I remember 
well) already supports multiple mount points for a given "source" like
mount /dev/hda1 /mnt1
mount /dev/hda1 /mnt2 and so on

-- 
Mihai RUSU                                    Email: dizzy@xxxxxxxxx
GPG : http://dizzy.roedu.net/dizzy-gpg.txt    WWW: http://dizzy.roedu.net
                       "Linux is obsolete" -- AST
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