Re: [Qemu-devel] [PATCH v2 5/5] block: add header update capability for VHDX images.

[Fam Zheng]

On Tue, 04/23 10:24, Jeff Cody wrote:
>      if (flags & BDRV_O_RDWR) {
> -        ret = -ENOTSUP;
> -        goto fail;
> +        vhdx_update_headers(bs, s, false);

Do we really have to update the header immediately on RW open? I assume
when implementing vhdx_co_writev, this is guaranteed to get called
before other write. In that case we don't need it here, which means we
don't change anything if no user write, even for RW opened file.

-- 
Fam