Re: [Qemu-devel] [PATCH] ceph/rbd block driver for qemu-kvm (v4)

[Anthony Liguori]

On 10/07/2010 03:47 PM, Yehuda Sadeh Weinraub wrote:
> > How is that possible?  Are the callbacks delivered in the context of a
> > different thread?  If so, don't you need locking?
> >      
> Not sure I'm completely following you. The callbacks are delivered in
> the context of a different thread, but won't run concurrently.

Concurrently to what?  How do you prevent them from running concurrently 
with qemu?

If you saw lock ups, I bet that's what it was from.

Regards,

Anthony Liguori

>   Do you
> see any specific concurrency issue? We can add some mutex protection
> around at the aio callback, so that if librados turns multithreaded at
> this point we're covered.
>
>
> Thanks,
> Yehuda
>
>