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Re: [PATCH 8/8] xfs: fix dquot shaker deadlock

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 8/8] xfs: fix dquot shaker deadlock
From: Alex Elder <aelder@xxxxxxx>
Date: Thu, 27 Jan 2011 09:29:01 -0600
Cc: xfs@xxxxxxxxxxx
In-reply-to: <1296100401-17135-9-git-send-email-david@xxxxxxxxxxxxx>
References: <1296100401-17135-1-git-send-email-david@xxxxxxxxxxxxx> <1296100401-17135-9-git-send-email-david@xxxxxxxxxxxxx>
Reply-to: aelder@xxxxxxx
On Thu, 2011-01-27 at 14:53 +1100, Dave Chinner wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
> 
> Commit 368e136 ("xfs: remove duplicate code from dquot reclaim") fails
> to unlock the dquot freelist when the number of loop restarts is
> exceeded in xfs_qm_dqreclaim_one(). This causes hangs in memory
> reclaim. Remove the bogus loop exit check that causes the problem.
> 
> Reported-by: Malcolm Scott <lkml@xxxxxxxxxxx>
> Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>

Still not a pretty loop (and I have no suggestions
to improve it).  But it looks correct.

Please add a mention in the description that the
double-increment issue in the qi_dqlist_lock case
has been fixed.

Reviewed-by: Alex Elder <aelder@xxxxxxx>



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