linux-kernel - [PATCH v2 0/2] gfs2: Stop using rhashtable_walk

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Message-Id: <20180329120612.6104-1-agruenba@redhat.com>
Date:   Thu, 29 Mar 2018 14:06:10 +0200
From:   Andreas Gruenbacher <agruenba@...hat.com>
To:     cluster-devel@...hat.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        NeilBrown <neilb@...e.com>, Thomas Graf <tgraf@...g.ch>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Tom Herbert <tom@...ntonium.net>,
        Andreas Gruenbacher <agruenba@...hat.com>
Subject: [PATCH v2 0/2] gfs2: Stop using rhashtable_walk_peek

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.

Thanks,
Andreas

Andreas Gruenbacher (2):
  lockref: Add lockref_put_not_zero
  gfs2: Stop using rhashtable_walk_peek

 fs/gfs2/glock.c         | 47 ++++++++++++++++++++++++++++-------------------
 include/linux/lockref.h |  1 +
 lib/lockref.c           | 28 ++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+), 19 deletions(-)

-- 
2.14.3