Re: [Qemu-devel] [PATCH v2 09/21] qcow2: Open images with refcount order != 4

[Eric Blake]

On 11/14/2014 06:06 AM, Max Reitz wrote:
> No longer refuse to open images with a different refcount entry width
> than 16 bits; only reject images with a refcount width larger than 64
> bits (which is prohibited by the specification).
> 
> Signed-off-by: Max Reitz <address@hidden>
> ---
>  block/qcow2.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

> 
> diff --git a/block/qcow2.c b/block/qcow2.c
> index d70e927..528d696 100644
> --- a/block/qcow2.c
> +++ b/block/qcow2.c
> @@ -677,10 +677,10 @@ static int qcow2_open(BlockDriverState *bs, QDict 
> *options, int flags,
>      }
>  
>      /* Check support for various header values */
> -    if (header.refcount_order != 4) {
> -        report_unsupported(bs, errp, "%d bit reference counts",
> -                           1 << header.refcount_order);
> -        ret = -ENOTSUP;
> +    if (header.refcount_order > 6) {
> +        error_setg(errp, "Reference count entry width too large; may not "
> +                   "exceed 64 bit");

s/bit/bits/

Maintainer can make that tweak, so:

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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