Re: [PATCH 06/17] block: Improve bdrv_has_zero_init_truncate with backing file

[Alberto Garcia]

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 the resized region.  But as this
> setup is rare, it penalizes the more common case of a backing layer
> smaller than the current layer.
>
> Signed-off-by: Eric Blake <address@hidden>

Reviewed-by: Alberto Garcia <address@hidden>

Berto