Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
probe::nfsd.lookup - NFS server opening or searching file for a file for client
SYNOPSIS
nfsd.lookup
VALUES
fh
file handle of parent dir(the first part is the length of the file handle)
client_ip
the ip address of client
filelen
the length of file name
filename
file name
SystemTap Tapset Reference March 2016 PROBE::NFSD.LOOKUP(3stap)