I see; thanks for the explanation.

It would be really nice if this could be hooked into FUSE, to avoid
library hackery.  It would seem to be that the upcalls into the FUSE
handler are more or less equivalent to the system call intercepts, so I
don't see why this would be super hard.

In NetBSD, the coda kernel module works correctly, I believe.  But it is
somewhat difficult to maintain.  There are so few coda users and (aren't
good automated regression tests) that I can see how an OS would not keep
it working.  It's only because of Brett and me that it works ok on
NetbSD.