arto.huusko@utu.fi said:
> with the new kernel the /mnt/nfs/usr directory appears empty. However,
> df(1), for example, shows that /mnt/nfs/usr is mounted. Attempting to
> umount the directory, I get "Invalid argument" error. 

I've fixed this last week. Some vnode vs. nfsnode lifecycle mismatch...
Try sys/nfs/nfs_node.c rev. 1.60.

I believe this is not ideal yet - directory caching is still
broken probably. Needs investigation...

best regards
Matthias