Re: [Qemu-devel] [PATCH 3/5] vmdk: Add option to create zeroed-grain image

[Stefan Hajnoczi]

On Fri, Apr 19, 2013 at 11:48:43AM +0800, Fam Zheng wrote:
> @@ -1714,6 +1719,11 @@ static QEMUOptionParameter vmdk_create_options[] = {
>              "VMDK flat extent format, can be one of "
>              "{monolithicSparse (default) | monolithicFlat | 
> twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} "
>      },
> +    {
> +        .name = BLOCK_OPT_ZEROED_GRAIN,

This option should be #defined in this patch.

> +        .type = OPT_FLAG,
> +        .help = "Enable zeroed-grain featur (implies header.version = 2)"

This message doesn't help the user.  Maybe something like this?

"Enable efficient zero writes using the zeroed-grain GTE feature"

I think header.version = 2 isn't relevant to users.  People who care
will have read the VMDK specification already.