Ceph

we set pool's target_max_bytes to 89000000000000(89TB),
but when the pool use 29561632420936B,
the "ceph health detail" reports "cache pool 'myEC1-autocache' with 27531GB at/near target max 82887GB"
after add some extra output info, we get this:
2015-07-20 09:40:48.704394 7f623868e700 0 mon.lab8101@0(leader).pg v357987 cache pool 'myEC1-autocache' with 29561632420936B at/near target max 89000000000000B ratio 932000 cache_target_full_ratio_micro 800000 mon_cache_target_full_warn_ratio 0.66 target_max_bytes*ratio/1000000 9161023705161

it seems the uint64_t can not hold "89000000000000*932000" which large than 2^64;