netdev - Re: [PATCH v2 0/2] gfs2: Stop using rhashtable_walk

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Message-ID: <20180329123544.GA22551@gondor.apana.org.au>
Date:   Thu, 29 Mar 2018 20:35:44 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Andreas Gruenbacher <agruenba@...hat.com>
Cc:     cluster-devel@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, NeilBrown <neilb@...e.com>,
        Thomas Graf <tgraf@...g.ch>, Tom Herbert <tom@...ntonium.net>
Subject: Re: [PATCH v2 0/2] gfs2: Stop using rhashtable_walk_peek

On Thu, Mar 29, 2018 at 02:06:10PM +0200, Andreas Gruenbacher wrote:
> Here's a second version of the patch (now a patch set) to eliminate
> rhashtable_walk_peek in gfs2.
> 
> The first patch introduces lockref_put_not_zero, the inverse of
> lockref_get_not_zero.
> 
> The second patch eliminates rhashtable_walk_peek in gfs2.  In
> gfs2_glock_iter_next, the new lockref function from patch one is used to
> drop a lockref count as long as the count doesn't drop to zero.  This is
> almost always the case; if there is a risk of dropping the last
> reference, we must defer that to a work queue because dropping the last
> reference may sleep.

In light of Neil's latest patch, do we still need this?

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt