[PATCH v2 0/2] gfs2: Stop using rhashtable_walk_peek

[Andreas Gruenbacher <agruenba@redhat.com>]

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(-)

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2.14.3