sync() not implemented by rumpfs

[a3an]

Hello,

while experimenting with rumpfs I noticed that sync() is not supported 
by rumpfs.

I added a sync() call in ../test/libc_ffat/main.cc and executed make 
run/rump_ext2. I got the following message:

[init -> test-libc_vfs] DUMMY sync(): sync called, not implemented

I guess, a filesystem not supporting sync() is of greatly reduced value.
Has this call been blocked on purpose ?

Regards, Adrian Schuur