probe::nfs.fop.aio_read — NFS client aio_read file operation
nfs.fop.aio_read
cache_valid
cache related bit mask flag
count
read bytes
file_name
file name
pos
current position of file
parent_name
parent dir name
buf
the address of buf in user space
ino
inode number
cache_time
when we started read-caching this inode
dev
device identifier
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.