From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: xl create should refuse to share block devices RW
	between domains
Date: Tue, 27 Jul 2010 08:18:50 -0700
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	<1280218738.5872.8148.camel@zakaz.uk.xensource.com>	
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To: Ian Campbell <Ian.Campbell@eu.citrix.com>
Cc: Xen-devel@lists.xensource.com, Ian Jackson <Ian.Jackson@eu.citrix.com>, Daniel Stodden <Daniel.Stodden@citrix.com>, Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
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  On 07/27/2010 03:55 AM, Ian Campbell wrote:
>> I also think that tap_ctl_create is the right place to do these checks,
>> not a script called by udev after the device has been created.
> Agreed. tapdisk should be taking out a flock() or something similar on
> any vhd files it is going to write to and should fail if it can't lock
> the file.

I'm not sure that would work for physical device/lvm backing.

     J