RE: PATCH zero-copy send completion callback

In addition to that I'm pretty sure I remember that some clusterfs
person already posted these patches a while ago and got ripped apart
in the same way.

Yes - unfortunately I didn't submit my patch personally.  And I've
rewritten it since to to avoid the obvious criticisms.  This time
around, I find the comments much more to the point.

                Cheers,
                        Eric