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osd: cancel_flush requeues blocked events after blocking event #4041
If we have request A (say, cache-flush) that blocks things, and then request B that gets blocked on it, and we have an interval change, then we need to requeue B first, then A, so that the resulting queue will keep A before B and preserve the order. This was observed on this firefly run: ubuntu@teuthology:/a/sage-2015-01-09_21:43:43-rados-firefly-distro-basic-multi/694675 Backport: giant, firefly Fixes: #10512 Signed-off-by: Sage Weil <firstname.lastname@example.org> (cherry picked from commit 11bdfb4)
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