cache related bit mask flag

inode number

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.

device identifier

start address within vm_mm

parent dir name

when we started read-caching this inode

the first byte after end address within vm_mm

file name

the address of buf in user space

vm flags