Date: Wed, 22 Jan 2003 13:17:39 +0100 From: Bernd Walter <ticso@cicely8.cicely.de> To: phk@FreeBSD.ORG Cc: Joerg Wunsch <joerg_wunsch@uriah.heep.sax.de>, freebsd-current@FreeBSD.ORG Subject: Re: I want a sysctl kern.allow_shooting_into_my_foot! Message-ID: <20030122121739.GA758@cicely8.cicely.de> In-Reply-To: <18699.1043186765@critter.freebsd.dk> References: <20030121225940.G37868@uriah.heep.sax.de> <18699.1043186765@critter.freebsd.dk>
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On Tue, Jan 21, 2003 at 11:06:05PM +0100, phk@FreeBSD.ORG wrote:
> In message <20030121225940.G37868@uriah.heep.sax.de>, Joerg Wunsch writes:
> >As phk@freebsd.org wrote:
> >
> >> Hang on.
> >>
> >> If no disk partitions of any kind are open, there is nothing which
> >> prevents you from doing a "dd if=/dev/zero of=/dev/da0 bs=64k".
> >
> >My guess is that vinum scanned the disks when starting, but found
> >nothing on it.
>
> And forgot to close them again ? Well, you know where to look
> for that bug then :-)
>
> (If you look in the "sysctl -b kern.geom.confxml" output, you will
> be able to see the read/write/exclusive open counts, look for
> "r%dw%de%d" strings.)
Interesting sysctl.
[...]
<geom id="0xc2c55400">
<class ref="0xc0314160"/>
<name>da13e</name>
<rank>3</rank>
<consumer id="0xc2b53b80">
<geom ref="0xc2c55400"/>
<provider ref="0xc2c4c800"/>
<mode>r1w1e0</mode>
</consumer>
</geom>
<geom id="0xc2c55600">
<class ref="0xc0314160"/>
<name>da13c</name>
<rank>3</rank>
<consumer id="0xc2c3b6c0">
<geom ref="0xc2c55600"/>
<provider ref="0xc2c4d680"/>
<mode>r0w0e0</mode>
</consumer>
</geom>
[...]
<geom id="0xc2c4c480">
<class ref="0xc0314160"/>
<name>da13</name>
<rank>2</rank>
<consumer id="0xc2c4f880">
<geom ref="0xc2c4c480"/>
<provider ref="0xc2c35380"/>
<mode>r0w0e0</mode>
</consumer>
</geom>
[...]
<geom id="0xc2c4d300">
<class ref="0xc03337a0"/>
<name>da13</name>
<rank>2</rank>
<config>
<frontstuff>16384</frontstuff>
<labeloffset>1024</labeloffset>
<rawoffset>0</rawoffset>
<mbroffset>0</mbroffset>
</config>
<consumer id="0xc2c4f780">
<geom ref="0xc2c4d300"/>
<provider ref="0xc2c35380"/>
<mode>r1w1e1</mode>
<config>
</config>
</consumer>
<provider id="0xc2c4c800">
<geom ref="0xc2c4d300"/>
<mode>r1w1e0</mode>
<name>da13e</name>
<mediasize>652329984</mediasize>
<sectorsize>1024</sectorsize>
<config>
<index>4</index>
<length>652329984</length>
<seclength>1274082</seclength>
<offset>0</offset>
<secoffset>0</secoffset>
</config>
</provider>
<provider id="0xc2c4d680">
<geom ref="0xc2c4d300"/>
<mode>r0w0e0</mode>
<name>da13c</name>
<mediasize>652329984</mediasize>
<sectorsize>1024</sectorsize>
<config>
<index>2</index>
<length>652329984</length>
<seclength>1274082</seclength>
<offset>0</offset>
<secoffset>0</secoffset>
</config>
</provider>
</geom>
[...]
If I got it right it tells me, that da13e is opened for read/write.
da13 is an MO driver and I can't eject the media, because it's locked.
The media was never mounted since booting.
I never complained about this, because the system is rather old
(2002-11-15) and I believed it was already fixed.
But it sounds like Joergs situation may be triggered by the same bug.
Mmmm - I'm using vinum too.
Is there any way to find out which ones open it was?
--
B.Walter COSMO-Project http://www.cosmo-project.de
ticso@cicely.de Usergroup info@cosmo-project.de
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