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H A Drecovery.cdiff c9ebc4b737999ab1f3264c42431f7be80ac2efbf Mon Feb 17 14:15:05 CST 2020 Bob Peterson <rpeterso@redhat.com> gfs2: allow journal replay to hold sd_log_flush_lock

Before this patch, journal replays could stomp on log flushes
and each other because both log flushes and journal replays used
the same sd_log_bio. Function gfs2_log_flush prevents other log
flushes from interfering by taking the sd_log_flush_lock rwsem
during the flush. However, it does not protect against journal
replays. This patch allows the journal replay to take the same
sd_log_flush_lock rwsem so use of the sd_log_bio is not stomped.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>