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Re: querying the ext3 journal

On Fri, 2002-09-13 at 17:11, Marc Wrona wrote:
> I'm not sure if this question makes sense, but here goes.  We have the need
> to periodically check for newly created/modified files in a rather elaborate
> and well populated directory structure.  I don't believe that simply walking
> the directory and checking stat's is the answer, given that I need a process
> that will impose minimal performance degredation on the system.  Would it be
> possible to query the journal itself for these changes?  Is there an API (or
> better yet, an app) to do so?
> Direct replies would be welcomed.  

Maybe fam (file alteration monitor) will suit your needs. It has kernel
cooperation for detection file/directory modifications. Many modern
distributions bundle it (for example RedHat 7.3). The nautilus file
manager uses that to automatically update the directory views.

Otherwise you can try the dnotify kernel facility (fam uses that if
present). Check the dnotify.txt file in the kernel sources.



> Thanks in advance for any assistance on this,
> Marc Wrona
> Senior Software Engineer
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Diego Santa Cruz
PhD. student
Publications available at http://ltswww.epfl.ch/~dsanta
Signal Processing Institute (LTS1 / ITS / STI)
Swiss Federal Institute of Technology (EPFL)
EPFL - STI - ITS, CH-1015 Lausanne, Switzerland
E-mail:     Diego SantaCruz epfl ch
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