Provided by: systemtap-doc_2.9-2ubuntu2_all 

NAME
probe::nfs.proc.open - NFS client allocates file read/write context information
SYNOPSIS
nfs.proc.open
VALUES
server_ip
IP address of server
flag
file flag
prot
transfer protocol
filename
file name
version
NFS version (the function is used for all NFS version)
mode
file mode
DESCRIPTION
Allocate file read/write context information
SEE ALSO
tapset::nfs_proc(3stap)
SystemTap Tapset Reference April 2016 PROBE::NFS.PROC.(3stap)