linux-kernel - Re: [RFC][PATCH 0/2] fsnotify: super block watch

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Date:   Wed, 21 Dec 2016 12:15:26 +0200
From:   Marko Rauhamaa <marko.rauhamaa@...ecure.com>
To:     Amir Goldstein <amir73il@...il.com>
CC:     Jan Kara <jack@...e.cz>, Al Viro <viro@...iv.linux.org.uk>,
        Eric Paris <eparis@...hat.com>,
        <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 0/2] fsnotify: super block watch

Amir Goldstein <amir73il@...il.com>:

> On the Oct 10 posting you asked me about the use case and it was hard
> to explain the use case with only part of the work done.
>
> The issue, which this work sets to solve, is the poor scalability of
> recursive inotify watches.

On my [employer's] part, the fanotify API suffers from leakage through
namespaces.

If you need to monitor files in a filesystem, the current fanotify
FAN_MARK_MOUNT flag does not give you a notification if you execute a
command like

   unshare -m touch xyz

inside the file system.

Amir's patch addresses this increasingly critical issue.


Marko