probe::nfsd.read — NFS server reading data from a file for client
nfsd.read
fhfile handle (the first part is the length of the file handle)
vecstruct kvec, includes buf address in kernel address and length of each buffer
fileargument file, indicates if the file has been opened.
client_ipthe ip address of client
offsetthe offset of file
countread bytes
vlenread blocks
sizeread bytes