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

NAME
probe::nfs.proc.lookup - NFS client opens/searches a file on server
SYNOPSIS
nfs.proc.lookup
VALUES
name_len
the length of file name
prot
transfer protocol
bitmask1
V4 bitmask representing the set of attributes supported on this filesystem
filename
the name of file which client opens/searches on server
bitmask0
V4 bitmask representing the set of attributes supported on this filesystem
version
NFS version
server_ip
IP address of server
SystemTap Tapset Reference March 2016 PROBE::NFS.PROC.(3stap)