gfs2: Add missing rcu locking for glock lookup
We must hold the rcu read lock across looking up glocks and trying to bump their refcount to prevent the glocks from being freed in between. Cc: <stable@vger.kernel.org> # 4.3+ Signed-off-by: NAndrew Price <anprice@redhat.com> Signed-off-by: NAndreas Gruenbacher <agruenba@redhat.com> Signed-off-by: NBob Peterson <rpeterso@redhat.com>
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