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

NAME
probe::nfs.proc.read_setup - NFS client setting up a read RPC task
SYNOPSIS
nfs.proc.read_setup
VALUES
prot
transfer protocol
size
read bytes in this execution
server_ip
IP address of server
version
NFS version
offset
the file offset
count
read bytes in this execution
DESCRIPTION
The read_setup function is used to setup a read RPC task. It is not doing the actual read operation.
SystemTap Tapset Reference March 2016 PROBE::NFS.PROC.(3stap)