Ceph

The dirty_info flag was added ages ago to avoid stuff done during advance*N + activate_map from rewriting the pg info zillions of times. Now some of the stuff called from that path is also called from other paths which don't check dirty_info (generate_past_intervals(), for one).

I think we want something similar to this, but i'm not sure if it should be pushed up into OSD.cc (any handle_*() is followed by if (dirty_info)...) or whether the osdmap refactoring will push the N advance_map's into PG.cc and it'll be best handled there. Hopefully the latter...

But in any case, that this needs an audit.