probe::nfs.fop.read_iter — NFS client read_iter file operation
nfs.fop.read_iter
cache_time
when we started read-caching this inode
file_name
file name
ino
inode number
cache_valid
cache related bit mask flag
parent_name
parent dir name
pos
current position of file
dev
device identifier
count
read bytes
attrtimeo
how long the cached information is assumed to be valid. We need to revalidate the cached attrs for this inode if jiffies - read_cache_jiffies > attrtimeo.