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

On 04/04/11 23:33, Stefan Hajnoczi wrote: > On Mon, Apr 4, 2011 at 6:54 PM, David Ahern <dsahern(a)gmail.com&gt; 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