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Date: Fri, 26 Sep 2008 11:26:38 +1000
From: Lachlan McIlroy <lachlan@sgi.com>
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Subject: Re: [PATCH v2] Use atomic_t and wait_event to track dquot pincount
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To: Peter Leckie <pleckie@sgi.com>
Cc: xfs@oss.sgi.com, xfs-dev@sgi.com

Peter Leckie wrote:
> Dave Chinner wrote:
>> but it doesn't fix the underlying problem that was causing the
>> spurious wakeups, which is the fact that xfs_qm_dqflush() is not
>> obeying non-blocking flush directions. The patch below should fix
>> that. Can you please test it before you add your patch?
>>   
> Yeah I already had this idea I  just have not posted a patch because 
> Lachlan though
> it might introduce a deadlock.
I suggested some changes a while back to make tail pushing non-blocking
and Dave thought it might cause a deadlock.

http://oss.sgi.com/archives/xfs/2008-07/msg00472.html

I actually did hit a deadlock with this change but could not figure out
why.  It may have been the same issue Pete is trying to fix here.

> If you think this is a good Idea I will 
> update my patch
> to  be non blocking.
>