probe::nfs.fop.sendfile — NFS client send file operation
nfs.fop.sendfile
cache_validcache related bit mask flag
cache_timewhen we started read-caching this inode
countread bytes
pposcurrent position of file
inoinode number
devdevice identifier
attrtimeohow 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.