From: Eric Sandeen <esandeen@redhat.com>
Subject: Re: ext4: Onchange?
Date: Mon, 1 May 2017 15:16:49 -0500
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To: Dietrich Hoppe <dietrich.hoppe@arcor.de>,
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On 5/1/17 2:51 PM, Dietrich Hoppe wrote:
> Hi,
> 
> is there any way to register an OnChange-function, that is called by
> the ext4 file system whenever a change occurs (i.e. create, delete,
> rename, move a file).
> 
> Regards Dietrich Hoppe
> 

Take a look at inotify in the linux kernel

https://lwn.net/Articles/604686/
https://en.wikipedia.org/wiki/Inotify
http://www.lanedo.com/filesystem-monitoring-linux-kernel/

etc

-Eric