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Date: Mon, 04 Apr 2011 23:42:57 -0600
From: David Ahern <dsahern@gmail.com>
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Subject: Re: [Qemu-devel] [PATCH v2 3/3] raw-posix: Re-open host CD-ROM after
	media change
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To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>, Juan Quintela <quintela@redhat.com>, libvir-list@redhat.com, qemu-devel@nongnu.org, Ryan Harper <ryanh@us.ibm.com>, Avi Kivity <avi@redhat.com>, Amit Shah <amit.shah@redhat.com>

On 04/04/11 23:33, Stefan Hajnoczi wrote:
> On Mon, Apr 4, 2011 at 6:54 PM, David Ahern <dsahern@gmail.com> wrote:
>> On 04/04/11 07:38, Anthony Liguori wrote:
>>> On 04/04/2011 08:22 AM, Avi Kivity wrote:
>>>> On 04/03/2011 02:57 PM, Stefan Hajnoczi wrote:
>>>>> In order for media change to work with Linux host CD-ROM it is
>>>>> necessary to reopen the file (otherwise the inode size will not
>>>>> refresh, this is an issue with existing kernels).
>>>>>
>>>>
>>>> Maybe we should fix the bug in Linux (and backport as necessary)?
>>>>
>>>> I think cd-rom assignment is sufficiently obscure that we can require
>>>> a fixed kernel instead of providing a workaround.
>>>
>>> Do reads fail after CD change?  Or do they succeed and the size is just
>>> reported incorrectly?
>>>
>>> If it's the later, I'd agree that it needs fixing in the kernel.  If
>>> it's the former, I'd say it's clearly a feature.
>>
>> In January 2010 I was seeing old data -- data from the prior CD -- in
>> the guest after the media change.
> 
> Yikes.  Is there a bug report for this?  What are the steps to reproduce it?

Not that I know of. It is reported by someone else last year as well:
http://www.mail-archive.com/kvm@vger.kernel.org/msg32999.html

> 
> Stefan