probe::nfs.fop.sendfile — NFS client send file operation
nfs.fop.sendfile
ino
inode number
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.
ppos
current position of file
cache_valid
cache related bit mask flag
dev
device identifier
cache_time
when we started read-caching this inode