On Fri 31 Jan 2020 06:44:25 PM CET, Eric Blake wrote:
> When we added bdrv_has_zero_init_truncate(), we chose to blindly
> return 0 if a backing file was present, because we knew of the corner
> case where a backing layer larger than the current layer might leak
> the tail of the backing layer into
When we added bdrv_has_zero_init_truncate(), we chose to blindly
return 0 if a backing file was present, because we knew of the corner
case where a backing layer larger than the current layer might leak
the tail of the backing layer into the resized region. But as this
setup is rare, it penalizes
