From owner-freebsd-current  Fri Oct  4 23:15:28 2002
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To: Ian Dowse <iedowse@maths.tcd.ie>
Cc: Robert Watson <rwatson@FreeBSD.ORG>,
	Terry Lambert <tlambert2@mindspring.com>,
	Emiel Kollof <coolvibe@hackerheaven.org>,
	Peter Wemm <peter@wemm.org>, n0go013 <ttz@blahdeblah.demon.co.uk>,
	current <freebsd-current@FreeBSD.ORG>
Subject: Re: [ GEOM tests ] disklabel warnings and vinum drives lost 
In-Reply-To: Your message of "Sat, 05 Oct 2002 03:10:12 BST."
             <200210050310.ab54012@salmon.maths.tcd.ie> 
Date: Sat, 05 Oct 2002 08:15:04 +0200
Message-ID: <81130.1033798504@critter.freebsd.dk>
From: Poul-Henning Kamp <phk@critter.freebsd.dk>
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In message <200210050310.ab54012@salmon.maths.tcd.ie>, Ian Dowse writes:
>In message <Pine.NEB.3.96L.1021004200338.70577U-100000@fledge.watson.org>, Robe
>rt Watson writes:
>>However, here's a patch that makes Vinum use namei() to rely on devfs to
>>locate requested devices instead of parsing the device name and guessing
>>the device number (incorrectly with GEOM).  Unfortunately, I almost
>>immediately run into a divide by zero due to a zero sector size.  Jeff
>>Roberson mentioned to me he had a fix for this bug that he sent to Greg,
>>but that was never committed.
>
>The divide by zero problem seems to be caused by an interaction
>between two bugs:

Make that _three_ bugs:  vinum opens devices directly at the cdevsw
level, bypassing in the process the vnodes and specfs.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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