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Date:      Mon, 9 Mar 1998 08:20:56 +0100
From:      Ollivier Robert <roberto@keltia.freenix.fr>
To:        current@FreeBSD.ORG
Subject:   Re: vnode_pager: *** WARNING *** stale FS code in system
Message-ID:  <19980309082056.A13758@keltia.freenix.fr>
In-Reply-To: <199803090356.UAA14668@mt.sri.com>; from Nate Williams on Sun, Mar 08, 1998 at 08:56:26PM -0700
References:  <199803090300.UAA13920@mt.sri.com> <199803090344.UAA17601@usr08.primenet.com> <199803090356.UAA14668@mt.sri.com>

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According to Nate Williams:
> What's the difference?  Aren't all FS's stackable?

No. If you stack B on top of A but B calls direct VM functions (like FFS
does), than A will not see them and it will screw something up. The purpose 
of stacking is that every function not implemented in B will be bypassed
and executed inside A.
 
> What effort?  Yours?  I dont see anyone working on the FS stacking
> effort.

Terry does. I would if I could understand all this.
 
> They were broken when we got them.  Their brokeness continued and was at
> times made worse due to changes made around them.  If they had been used
> by someone, then they would have been maintained.

Uh ? Using something can be done without knowing anything about it. Nullfs
has very interesting uses but you should not have to be able to write the
code in order to use it.

> appreciate you taking the time to answer my questions.  I'm attempting
> to learn wherever I can, and since FS-101 died I'm learning wherever I
> can. :)

Ditto. Terry makes sense here.
-- 
Ollivier ROBERT -=- FreeBSD: The Power to Serve! -=- roberto@keltia.freenix.fr
FreeBSD keltia.freenix.fr 3.0-CURRENT #0: Sun Mar  1 18:50:39 CET 1998

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