On Mon, Mar 27, 2017 at 05:38:08PM +0300, Denis V. Lunev wrote:
> Parallels driver should not call bdrv_truncate if the image was opened
> in the read-only mode. Without the patch
>     qemu-img check harddisk.hds
> asserts with
>     bdrv_truncate: Assertion `child->perm & BLK_PERM_RESIZE' failed.
> 
> Parameters used on the write path are not needed if the image is opened
> in the read-only mode.
> 
> Signed-off-by: Denis V. Lunev <den@openvz.org>
> Reported-by: Edgar Kaziahmedov <edos@virtuozzo.mipt.ru>
> CC: Stefan Hajnoczi <stefanha@redhat.com>
> ---
>  block/parallels.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Thanks, applied to my block tree:
https://github.com/stefanha/qemu/commits/block

Stefan