Re: [Qemu-devel] active block commit bug?

[Markus Armbruster <armbru@redhat.com>]

Eric Blake <eblake@redhat.com> writes:

> On 06/04/2014 08:09 PM, Fam Zheng wrote:
>
>>> Sounds like we have an off-by-one condition if empty files behave
>>> differently from other files.  We ought to fix that bug (not that your
>>> normal guest will ever have a 0-length backing file, but this was what I
>>> was trying to use for libvirt's probing of whether active commit is
>>> supported)
>>>
>> 
>> Yes, agreed, this special case is only going to make management confused. I
>> will send a patch to fix this.
>
> Thanks.
>
>> 
>> Eric, is this a good way to probe the active commit? I was expecting full
>> instrospection of QMP could do it, but I don't know about the status of that
>> piece of work. Amos, any ideas?
>
> Introspection already missed qemu 2.0 when active commit was added; and
> we're close enough to soft freeze for 2.1 that I'm guessing it will miss
> 2.1 as well :(

Almost certainly.  It has non-trivial design issues.  To have a chance
to make it into 2.x, it needs to be posted for review early in the 2.x
cycle.

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