I'm trying to track down whether the client address is ever being set in a NFS request. I've checked with build 117, 112, 109, 85, and now I'm trying 79a. I've got a VMWare image running on a laptop. But for some reason my probe isn't loading:

# ./req.d
dtrace: failed to compile script ./req.d: line 3: probe description ::rfs_dispatch:entry does not match any probes
# dtrace -f rfs_dispatch
dtrace: invalid probe specifier rfs_dispatch: probe description ::rfs_dispatch: does not match any probes

A clue can be found here:

# share
#

The clue is that with no shares loaded, then the 'nfssrv' module is not loaded. If we create a share, we see:

# share -F nfs -o rw,anon=0 /export/home
# dtrace -f rfs_dispatch
dtrace: description 'rfs_dispatch' matched 2 probes
^C

# ./req.d
dtrace: script './req.d' matched 1 probe

We have success!