Re: [Xen-devel] Re: Timeout connecting to device

[Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>]

On Mon, Aug 29, 2005 at 10:17:18AM +1000, Rusty Russell wrote:
> On Fri, 2005-08-26 at 11:37 +0100, Christian Limpach wrote:
> > On Fri, Aug 26, 2005 at 10:27:06AM +1000, Rusty Russell wrote:
> > > A slight variation on this would be to have the tools create the
> > > "setting-up" node, and the driver delete it when it's happy.
> > > 
> > > I want to leave the error node on every error, so that way you can tell
> > > if it can't read the backend because of permission problem or something,
> > > even if during setup.
> > 
> > How do you tell if an error is final though?  Removing the setting-up
> > node sounds kind of misleading since the device is not done setting-up.
> > I think we need to indicate somehow whether an error is final or
> > transient, but I don't think we should require the format of the
> > error message to somehow indicate this.
> 
> I don't think the frontend can, in general, tell the difference between
> a final error and a transient one.  The problem may simply be that the
> backend never creates a node we need.  If we're completely giving up, we
> could remove the setting-up node, but I'm not sure it's worth it?

There are error which are final, like a node which holds data which doesn't
make sense (like when scanf "%d" fails).  Yes, there are some where you
can't tell if they are transient or final...  I guess the fatal ones I
think about are not very likely if the frontend and backend are matched
and not broken...

    christian


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