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

[Padraig Brady <padraig@antefacto.com>]

Andi Kleen wrote:

>>>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
>
Well IMHO "newer than", "older than" applications have until now
done with second resolution, and that's all that's required?

Padraig.