[Bug 260894] Nonexportable file systems are usable over NFSv4

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260894

--- Comment #5 from Rick Macklem <rmacklem@FreeBSD.org> ---
Take a look at usr.sbin/mountd/mountd.c, around line#3205-3264.
If I read it correctly, a return from nmount(2) of EINVAL indicates
"this is not a mount point". The loop then moves up a directory level and
tries again.

I have a hunch that what you did was export the underlying/parent
file system and you were looking at "/mnt" in this parent file system.

Short answer, try EPERM instead of EINVAL.

Another issue is that nmount(2) is also used by mountd.c to delete
exports, and that will fail too, if you have VFS_MOUNT() return
a failure for that case.
--> Might not matter if it has never been exported.

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