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Re: [Linux-cluster] GFS 2 node hang in rm test



On Fri, Dec 10, 2004 at 01:45:45PM -0500, Daniel Phillips wrote:
> Hi Patrick,
> 
> On Friday 10 December 2004 04:14, Patrick Caulfield wrote:
> > On Thu, Dec 09, 2004 at 04:52:42PM -0500, Daniel Phillips wrote:
> > If you call dlm_lock() with the same parameters twice then you will get
> > two seperate locks - in that case the CR will wait for the PW to get out
> > of the way. What is really confusing the issue is that both locks are
> > sharing a lock status block - so it's possible that one lock is being
> > marked INPROGRESS immediately after the first has completed, in that case
> > the library will have a lot of difficulty in digging you out of your own
> > hole I'm afraid as it can't disentangle the status of your two locks.
> 
> For robustness, dlm_unlock(_wait) ought to return an error in that case.
> 
> But are these locks supposed to be recursive or not?

It's not a question of recursive or non-recursive locks, it's a question of the
user re-using the same status block for two different locks. That is most
certainly NOT supported. But if it's possible for the library code to behave
better in that circumstance then I think it should.

-- 

patrick


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