Thanks for your review, Eric.
Yes, the wr_highest_offset can tell the end offset at runtime, and
write_threshold similar to it. But in my situation, I need to know
the allocated end without a vm running.
Eric Blake 于2018年5月2日周三 下午10:02写道：
> On 05/02/2018 08:34 AM, Ivan Ren wrote:
> > qemu-img in
> The whole implementation reminds me a lot of qcow2's check function,
> which basically just recalculates the refcounts. So I'm wondering
> whether you could just count how many clusters with non-0 refcount there
> are and thus simplify the implementation dramatically.
Thanks for your review, Ma
