Given that disks, disk controllers, and disk array controllers all have big RAM buffers and report writes as done long before they actually are complete, I'd say: let's flush both sync-file and sync-file-system from SRFI 170.  That disposes of the question of which is the most useful (or least broken) scsh implementation.

John Cowan          http://vrici.lojban.org/~cowan        xxxxxx@ccil.org
The whole of Gaul is quartered into three halves.
        --Julius Caesar