[libvirt] [Qemu-devel] [PATCH v2 3/3] raw-posix: Re-open host CD-ROM after media change

[Stefan Hajnoczi]

On Mon, Apr 4, 2011 at 6:54 PM, David Ahern <dsahern at 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?

Stefan