os/bluestore: reuse zombie OpSequencers by collection id
We can get a sequence that deletes and then recreates a collection where
the transaction removing the collection is delayed (due to pending IO on
its sequencer) but colleciton create is not (new sequencer).
Avoid any such reordering by recycling the old collection's sequencer if
the zombie_osr has not been reaped yet.
Fixes: http://tracker.ceph.com/issues/24550 Signed-off-by: Sage Weil <sage@redhat.com>
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