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

NAME
probe::nfs.proc.release - NFS client releases file read/write context information
SYNOPSIS
nfs.proc.release
VALUES
mode
file mode
filename
file name
prot
transfer protocol
version
NFS version (the function is used for all NFS version)
flag
file flag
server_ip
IP address of server
DESCRIPTION
Release file read/write context information
SystemTap Tapset Reference March 2016 PROBE::NFS.PROC.(3stap)