newnfs client and statfs

[Rick Macklem]

Hi,

I have attached a version of the patch that I intend to commit
unless it doesn't work for Kostik's test case. Kostik, could
you please test this one.

Yes, Bruce, I realize you won't like it, but I
have put some comments in it
to try and clarify why it is coded the way it is.
(The arithmetic seems to work the way I would expect it to for
 i386, which is the only arch I have for testing.)

If the "collective concensus" is to "cheat" and put the negative
values in the uint64_t on the wire, then I can commit a change
to handle that later. If anyone has input w.r.t. this, please post
it under the Subject heading "NFS server handling of negative f_bavail?"
on freebsd-fs at freebsd.org.

I basically need to move onto other issues, rick
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