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

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?

Stefan