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Date: Tue, 08 Jan 2002 19:47:28 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Richard Gooch <rgooch@ras.ucalgary.ca>
CC: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] DevFS support for /dev/cpu/X/(cpuid|msr)
In-Reply-To: <20020106181749.A714@butterlicious.bodgit-n-scarper.com>	<20020108201451.088f7f99.rusty@rustcorp.com.au>	<a1f9j9$5i9$1@cesium.transmeta.com>	<20020109120108.39bcf7ad.rusty@rustcorp.com.au>	<a1gcme$18t$1@cesium.transmeta.com> <200201090330.g093UB427696@vindaloo.ras.ucalgary.ca>
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Richard Gooch wrote:

>>>
>>So you chown an entry, then a module is unloaded and reloaded, now
>>what happens?
>>
>>It's the old "virtual filesystem which really wants persistence"
>>issue again...
>>
> 
> Works beautifully with devfs+devfsd :-)
> 
> Permissions get saved elsewhere in the namespace (perhaps even to the
> underlying /dev) as you chown(2)/chmod(2)/mknod(2), and are restored
> when entries are (re)created and/or at startup.
> 
> My /dev has persistence behaviour which looks like a FS with backing
> store.
> 


Yes, after quite a few years it finally got in there.  This is a Good 
Thing[TM].  Now apply the same problem to /proc.

	-hpa


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