linux-kernel - Re: "Why Reuser 4 still is not in" doc

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Date:	Mon, 17 Jul 2006 14:41:47 -0400
From:	Horst von Brand <vonbrand@....utfsm.cl>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
cc:	Al Boldi <a1426z@...ab.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: "Why Reuser 4 still is not in" doc 

Jan Engelhardt <jengelh@...ux01.gwdg.de> wrote:
> >Using this as an argument against plug-ins is a bit strange.  I suppose 
> >somebody could go overboard and use plug-ins to implement a subKernel.  
> >Would this then imply that plug-ins are wrong?

> Ok, I've read some other threads too and so this claim should be adjusted:

> Writing a plugin (not necessarily r4 specific) that changes the semantics 
> of objects based on context (i.e. turning a file into a dir) is a bad idea 
> IMHO.

Right.

> Actually, BSD has this double-semantic to a limited degree: you can call 
> `/usr/bin/vi /usr/bin` and get some binary representation of readdir.

How is that useful? read(2) errors out on a directory, and that is fine
with me. If xemacs wants to do funky stuff when opening a directory, it is
free to notice that special case and do something (readdir(3) and its ilk
are quite useful here) about it.

[Yes, I did work on some boxen where you could read directories, but with
 the current variety of filesystems (and corresponding directory formats!)
 in Linux this way lies utter madnes.]
-- 
Dr. Horst H. von Brand                   User #22616 counter.li.org
Departamento de Informatica                     Fono: +56 32 654431
Universidad Tecnica Federico Santa Maria              +56 32 654239
Casilla 110-V, Valparaiso, Chile                Fax:  +56 32 797513
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