Re: [Qemu-devel] [PATCH v2 2/2] block: move the bdrv_dev_change_media_cb()

[Luiz Capitulino <lcapitulino@redhat.com>]

On Mon, 17 Jun 2013 15:46:52 +0200
Kevin Wolf <kwolf@redhat.com> wrote:

> Am 17.06.2013 um 15:38 hat Pavel Hrdina geschrieben:
> > >>>>>It's just a warning, that you used a password for a block device that
> > >>>>>doesn't require it. The device is opened successfully and should be
> > >>>>>handled correctly (call the bdrv_dev_change_media_cb() ).
> > >>>>
> > >>>>Yep, IMO it's worth a comment that this isn't an "error" just a
> > >>>>"warning".
> > >>>
> > >>>Actually, you can't have such a warning in QMP. You either fail or you
> > >>>succeed. We should just do what the current code does.
> > >>>
> > >>
> > >>This is the same logic as the old one. The device is loaded but the
> > >>error is emitted.
> > >
> > >That's a bug if the operation succeeded.
> > >
> > 
> > In that case, how do you think, that we should handle the situation
> > that user is trying to open device that isn't require the password, but
> > user will provide the password?
> > 
> > I don't think that we should fail and abort that operation.
> 
> I think we should. The image and the options passed for it don't fit
> together, this is an error condition. Probably the user meant to pass a
> different image.

I agree in principle, but I fear this might be an incompatible change as
there might be clients out there assuming the VM is up and running (because
it's what ends up happening).

Thinking about this again though, the client does get an error...