Re: [PATCH] iotests/197: Fix for compat=0.10

[Eric Blake <eblake@redhat.com>]

On 7/27/20 8:52 AM, Max Reitz wrote:
> Writing zeroes to a qcow2 v2 images without a backing file results in an
> unallocated cluster as of 61b3043965.  197 has a test for COR-ing a
> cluster on an image without a backing file, which means that the data
> will be zero, so now on a v2 image that cluster will just stay
> unallocated, and so the test fails.  Just force compat=1.1 for that
> particular case to enforce the cluster to get allocated.
> 
> Fixes: 61b3043965fe3552ee2684a97e7cc809ca7a71b3
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
>   tests/qemu-iotests/197 | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)

Reviewed-by: Eric Blake <eblake@redhat.com>

> 
> diff --git a/tests/qemu-iotests/197 b/tests/qemu-iotests/197
> index 95f05b0e34..121959a09c 100755
> --- a/tests/qemu-iotests/197
> +++ b/tests/qemu-iotests/197
> @@ -112,7 +112,9 @@ echo
>   echo '=== Partial final cluster ==='
>   echo
>   
> -_make_test_img 1024
> +# Force compat=1.1, because writing zeroes on a v2 image without a
> +# backing file would just result in an unallocated cluster
> +_make_test_img -o compat=1.1 1024
>   $QEMU_IO -f $IMGFMT -C -c 'read 0 1024' "$TEST_IMG" | _filter_qemu_io
>   $QEMU_IO -f $IMGFMT -c map "$TEST_IMG"
>   _check_test_img
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org