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From: Ingo Oeser <ioe-lkml@rameria.de>
To: Ian Turner <vectro@vectro.org>
Subject: Re: waiting for MNT_DETACH
Date: Tue, 4 Jul 2006 00:43:10 +0200
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Hi Ian,

On Sunday, 2. July 2006 20:51, Ian Turner wrote:
> I administer a two-node high-availability cluster using DRBD and heartbeat. 
> 
> So, here's the question: Is there a way to check if a call to umount2(..., 
> MNT_DETACH) has completed or not?

Check the usage count (refcount) of the DRBD module. It should be as low as
you would expect with a normal umount.

"cat /sys/module/drbd/refcnt" should be the right command.


Regards

Ingo Oeser