It would have been a significant surprise if it worked, too - see
http://www.freebsd.org/~eivind/FixNULL.patch for a start on fixing
this. (There are some locking issues that I haven't had time to sort
out yet, so that patch will not give you a 100% functional NULLFS.
I'll look at this as soon as my testbox is free again.)
Bill Studenmund in NetBSD is doing major surgery wrt locking and NullFS.
Maybe you'd like to coordinate with him?
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