Re: [Qemu-devel] [PATCH] qcow2: Change default for new images to compat=1.1

[Kevin Wolf <kwolf@redhat.com>]

Am 23.08.2013 um 13:05 hat Ján Tomko geschrieben:
> On 08/19/2013 11:25 AM, Kevin Wolf wrote:
> > By the time that qemu 1.7 will be released, enough time will has passed
> > since qemu 1.1, which is the first version to understand version 3
> > images, that changing the default shouldn't hurt many people any more
> > and the benefits of using the new format outweigh the pain.
> > 
> > qemu-iotests already runs with compat=1.1 by default.
> > 
> > Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> > ---
> >  block/qcow2.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/block/qcow2.c b/block/qcow2.c
> > index 3376901..42ea7ec 100644
> > --- a/block/qcow2.c
> > +++ b/block/qcow2.c
> > @@ -1402,7 +1402,7 @@ static int qcow2_create(const char *filename, QEMUOptionParameter *options)
> >      int flags = 0;
> >      size_t cluster_size = DEFAULT_CLUSTER_SIZE;
> >      int prealloc = 0;
> > -    int version = 2;
> > +    int version = 3;
> >  
> >      /* Read out options */
> >      while (options && options->name) {
> >
> 
> This does not affect qemu-img (or bdrv_img_create), as it gets overwritten
> with 2 when BLOCK_OPT_COMPAT_LEVEL is present in options, but the value is NULL.

Whoops... Thanks for catching this, I'll send a v2.

> Should this go into qcow2_create_options[] as well?

Not sure what you want to change in the options array? It doesn't seem
to denote a default.

Kevin