Re: [Qemu-block] [Qemu-devel] [PATCH 1/2] block/io: allow AIOCB without callback

[Peter Lieven]

Am 21.08.2015 um 08:12 schrieb Eric Blake:
> On 08/20/2015 01:14 AM, Peter Lieven wrote:
> > If the backend storage is unresponsive and we cancel a request due to
> > a timeout we cannot immediately destroy the AIOCB because the storage
> > might complete the original request laster if it is responsive again.
> s/laster/later/
>
> > For this purpose allow to set the callback to NULL and ignore it in
> > this case.
> >
> > Signed-off-by: Peter Lieven <address@hidden>
> > ---
> I'll leave the technical review to others, I'm just pointing out grammar.


I am using this one for quite some time now. It seems a good step into solving 
the deadlock
problem. The issue is we still need to make the ATAPI calls async. The OS is 
only spending 2-3 Minutes
with DMA cancelling and then issues reads again so we still deadlock at the end.

Peter