On 8 June 2014 19:37, Charles Forsyth <charles.forsyth@gmail.com> wrote:

> On 8 June 2014 19:15, erik quanstrom <quanstro@quanstro.net> wrote:
>
>> i think it is in the image cache, but .ref >1.
>
>
> but in that case it will still not pio, but make a local writable copy.


in fact ref > 1 is the copy-on-write case and in a sense the usual one,
where the copy is needed.