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

NAME
probe::nfsd.open - NFS server opening a file for client
SYNOPSIS
nfsd.open
VALUES
access
indicates the type of open (read/write/commit/readdir...)
type
type of file (regular file or dir)
fh
file handle (the first part is the length of the file handle)
client_ip
the ip address of client
SystemTap Tapset Reference March 2016 PROBE::NFSD.OPEN(3stap)