ceph/ceph — pull request #1348 by guangyy (2014-03-03 11:31:58+00:00)
Title: Fix the lock contention issue during scrubbing

Fix the lock contention issue during scrubbing by:
1. Only make primary PG register itself to the scrub list
2. When role changes, explicitly refresh the list

Signed-off-by: Guang Yang (yguang@yahoo-inc.com)