> > I can see space reduction up to 4% using this feature. Considering the > > fact that it comes at no cost, it would be stupid to remove it. > > Okay, looks like it's useful but not a huge win. > > In the NBD approach pipelining writes (or discards) ought to make 4 KB zero > blocks usable without overhead.
But you need to re-asemble 64KB block from that - I guess that is the difficult part here?
