[Linux-cluster] DLM user API for blocking AST

Jean-Marc Saffroy saffroy at gmail.com
Tue Dec 20 01:15:28 UTC 2016

On Mon, 19 Dec 2016, David Teigland wrote:

> As a workaround to avoid an unwanted bast callback after a completion, I
> wonder if you could make a no-op call with NULL astaddr/astarg to prevent
> any further callback using those?

I assume that what you call a no-op is a lock conversion towards the same 
mode as before, correct?

Then I think for this to work we need the second assumption I made, ie. 
the kernel should not deliver the bast event to userland after it 
delivered the cast for the last conversion.

[... assumptions ...]
> That also sounds like it should be true.
> To say with more certainty would require closer study of the code, because
> whatever rules exist are a function of the current implemention, and not
> derived from higher design rules per se.

Ok, I understand.

Thank you David!


saffroy at gmail.com

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