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From: Rusty Russell <rusty@linuxcare.com.au>
To: Keith Owens <kaos@ocs.com.au>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Persistent module storage - modutils design 
In-Reply-To: Your message of "Wed, 08 Nov 2000 00:51:33 +1100."
             <14032.973605093@ocs3.ocs-net> 
Date: Thu, 09 Nov 2000 15:52:47 +1100
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In message <14032.973605093@ocs3.ocs-net> you write:
> On Tue, 07 Nov 2000 10:30:39 -0300, 
> Horst von Brand <vonbrand@inf.utfsm.cl> wrote:
> >Note! This _has_ to be in the / filesystem so it works before mounting the
> >rest of the stuff (if ever). This would rule out /var, and leave just
> >/lib/modules/<version>. Makes me quite unhappy...
> 
> Modules are loaded before non-root file systems are mounted, damn!

modules.conf already breaks FHS lib/ badly enough.  Modules loaded
before /var is mounted won't get persistant data.  Too bad; they
have to do something sane when it doesn't exist anyway.

> Looks like persistent data has to be stored in /lib/modules/persist (no
> <version>, see earlier mail).

You need versions: binary data is too prone to change (proven kernel
history).  It's the kernel installer's duty to know which ones can be
safely linked/copied to the new version.

Otherwise every data change requires a new symbol name: and this will
happen all the time.

Rusty.
--
Hacking time.
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