Re: [Qemu-devel] [PATCH v3 7/8] add mirroring to transaction

[Eric Blake]

On 03/05/2012 10:34 AM, Paolo Bonzini wrote:
> With it comes a new image creation mode, "no-backing-file", that can
> be used to stream an image so that the destination does not need the
> original image's backing file(s).
> 
> Both bdrv_append and blkmirror will set the backing_hd on the target,
> even if the image is created without one, so that both streaming and
> copy-on-write work properly (at least with qcow2 or qed, not raw).
> 
> Streaming mode works with the following gotchas:
> 
> - streaming will rewrite every bit of the source image;
> 
> - zero writes are not supported by the blkmirror driver, hence both
>   the source and the destination image will grow to full size.
> 
> @@ -1159,7 +1175,8 @@
>  ##
>  { 'union': 'BlockdevAction',
>    'data': {
> -       'blockdev-snapshot-sync': 'BlockdevSnapshot'
> +       'blockdev-snapshot-sync': 'BlockdevSnapshot',

Minor nit - should we rebase this trailing comma earlier in the series,
to make it obvious that BlockdevAction will grow and for less churn in
this patch?

-- 
Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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