ceph/ceph — pull request #2782 by boydc2014 (2014-10-23 08:44:38+00:00)
Title: fix can not disable max_size quota

Currently if we enable quota and set max_size = -1 trying to disable max size quota, it turns out to be max_size_kb = 0 and it will cause we can not write any object. The root cause is rgw_rounded_kb returns 0 for -1. We should not convert negative value to uint64_t.