when setting a built-in xattr (like read/write freshness), push to the MS.
when setting a built-in xattr (like read/write freshness), push to the
MS.

syndicate-storage/syndicate-core,syndicate-storage/syndicate-core,iychoi/syndicate-core,iychoi/syndicate-core,syndicate-storage/syndicate-core,syndicate-storage/syndicate-core,iychoi/syndicate-core,iychoi/syndicate-core