From: "Petr Vandrovec" <VANDROVE@vc.cvut.cz>
Organization: CC CTU Prague
To: Padraig Brady <padraig@antefacto.com>
Date: Fri, 5 Oct 2001 15:27:39 MET-1
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Subject: Re: Finegrained a/c/mtime was Re: Directory notification pr
CC: Alex Larsson <alexl@redhat.com>, Ulrich Drepper <drepper@cygnus.com>,
        linux-kernel@vger.kernel.org
Message-ID: <567F3237EED@vcnet.vc.cvut.cz>
Sender: linux-kernel-owner@vger.kernel.org

On  5 Oct 01 at 14:15, Padraig Brady 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;

make needs comparing timestamps between two files. I cannot imagine
how you can get this working (without network filesystem you can
have global gen_count, but with network filesystem each server has
its own gen_count... and using world-wide nanoseconds instead of world-wide
gen_count looks much simpler to me ;-) )
                                                Best regards,
                                                    Petr Vandrovec
                                                    vandrove@vc.cvut.cz
                                                    
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