[Qemu-devel] Re: [PATCH] ceph/rbd block driver for qemu-kvm (v7)

[Yehuda Sadeh Weinraub <yehudasa@gmail.com>]

On Mon, Nov 15, 2010 at 9:04 AM, Christian Brunner
<c.m.brunner@gmail.com> wrote:
> Hi Stefan,
>
> thanks for your feedback. Yehuda and Sage have already committed some
> pathes to our git repository.
>
> What I'm not sure about is the rados_(de)initialization for multiple
> rbd images. I suspect that _deinitialize should only be called for the
> last rbd image.
>
> Yehuda and Sage know librados a lot better than me. I pretty sure,
> that they will give some feedback about this remaining issue. After
> that we will send an updated patch.
>
> Regards,
> Christian
>
> 2010/11/11 Stefan Hajnoczi <stefanha@gmail.com>:
>> On Fri, Oct 15, 2010 at 8:54 PM, Christian Brunner <chb@muc.de> wrote:
>>> [...]
>>> +
>>> +    if ((r = rados_initialize(0, NULL)) < 0) {
>>> +        error_report("error initializing");
>>> +        return r;
>>> +    }
>>
>> Does rados_initialize() work when called multiple times?  This would happen if
>> the VM has several rbd devices attached.
>>
>> [...]
>>
>> Stefan
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The rados (de)initialization is refcounted and it is safe to call it
multiple times.