On Fri, Apr 06, 2012 at 04:24:54PM +0200, Fran?ois Legal wrote: > Anyway, I gave a test drive on this, and seem to be having locking > issues (users on both side can modify the same file without anything > preventing this). > > Can anybody comment on this. That's just POSIX semantics. You could even have two users on the same machine accessing the same file and modifying it concurrently. If you want locks then (a) your application has to ask for them, and (b) other applications must also respect them [unless you're talking about mandatory locks, which are an unusual feature]