CHANGELOG of v2.2 Feature curvefs: support curvebs as data backend curvefs/metaserver: now we support rocksdb storage Optimization optimize copyset creation curvefs/client: s3 adaptor unit test optimization curvefs: xattr summary info support hard link Bugfix curvefs/client: fix waitIntervalSec_ is not init metaserver: fix empty configuration after load snapshot curvefs-mds: fix an uninitialized that spawn infinite threads