Provided by: systemtap-doc_4.2-3ubuntu0.1_all 

NAME
probe::nfsd.read - NFS server reading data from a file for client
SYNOPSIS
nfsd.read
VALUES
client_ip
the ip address of client
size
read bytes
fh
file handle (the first part is the length of the file handle)
vec
struct kvec, includes buf address in kernel address and length of each buffer
file
argument file, indicates if the file has been opened.
vlen
read blocks
offset
the offset of file
count
read bytes
SEE ALSO
tapset::nfsd(3stap)
SystemTap Tapset Reference November 2019 PROBE::NFSD.READ(3stap)