From mboxrd@z Thu Jan  1 00:00:00 1970
From: George Dunlap <george.dunlap@eu.citrix.com>
Subject: Re: [PATCH] Don't use tapdisk for cd-roms
Date: Thu, 2 May 2013 12:04:59 +0100
Message-ID: <5182485B.2000704@eu.citrix.com>
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Cc: Fabio Fantoni <fabio.fantoni@heliman.it>, Ian Jackson <Ian.Jackson@eu.citrix.com>, Ian Campbell <Ian.Campbell@citrix.com>, Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
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On 02/05/13 12:03, George Dunlap wrote:
> blktap does not support the insert / eject commands, and so is not
> suitable for cd-roms.
>
> This fixes the bug where libxl uses tapdisk as a cdrom back-end, causing
> subsequent eject / insert commands to fail.

This is also a candidate for backport to 4.2, as the same issue is 
present there.

  -George