Re: [Qemu-devel] [PATCH v2 2/3] block: resize backing image during active layer commit, if needed

[Eric Blake]

On 01/21/2014 09:31 AM, Jeff Cody wrote:
> If the top image to commit is the active layer, and also larger than
> the base image, then an I/O error will likely be returned during
> block-commit.
> 
> For instance, if we have a base image with a virtual size 10G, and a
> active layer image of size 20G, then committing the snapshot via
> 'block-commit' will likely fail.
> 
> This will automatically attempt to resize the base image, if the
> active layer image to be committed is larger.
> 
> Signed-off-by: Jeff Cody <address@hidden>
> ---
>  block/mirror.c | 36 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 

> +    if (length > base_length) {
> +        if (bdrv_truncate(base, length) < 0) {
> +            error_setg(errp, "Top image %s is larger than base image %s, and 
> "
> +                             "resize of base image failed.",

We typically don't use trailing '.' in error messages.

But that's small enough that I'm okay adding:

Reviewed-by: Eric Blake <address@hidden>

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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