Re: Finegrained a/c/mtime was Re: Directory notification problem

[Andi Kleen]

> >Another advantage of using the real time instead of a counter is that 
> >you can easily merge the both values into a single 64bit value and do
> >arithmetic on it in user space. With a generation counter you would need 
> >to work with number pairs, which is much more complex. 
> >
> ??
> if (file->mtime != mtime || file->gen_count != gen_count)
>      file_changed=1;

And how would you implement "newer than" and "older than" with a generation
count that doesn't reset in a always fixed time interval (=requiring
additional timestamps in kernel)?  

-Andi