Merge pull request #14053 from jdurgin/wip-19191

osd/PG: reset the missing set when restarting backfill

Reviewed-by: David Zafman <dzafman@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>

src/osd/PG.cc

@@ -2230,6 +2230,10 @@ void PG::split_into(pg_t child_pgid, PG *child, unsigned split_bits)
     // in the future).
     info.set_last_backfill(hobject_t());
     child->info.set_last_backfill(hobject_t());
+    // restarting backfill implies that the missing set is empty,
+    // since it is only used for objects prior to last_backfill
+    pg_log.reset_backfill();
+    child->pg_log.reset_backfill();
   }
 
   child->info.stats = info.stats;