linux-kernel - Re: [PATCH 3/7] vfs: Add a mount-notification facility

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Message-ID: <15839.1559128587@warthog.procyon.org.uk>
Date:   Wed, 29 May 2019 12:16:27 +0100
From:   David Howells <dhowells@...hat.com>
To:     Jann Horn <jannh@...gle.com>
Cc:     dhowells@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
        raven@...maw.net, linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        linux-block@...r.kernel.org, keyrings@...r.kernel.org,
        linux-security-module <linux-security-module@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/7] vfs: Add a mount-notification facility

Jann Horn <jannh@...gle.com> wrote:

> I don't really know. I guess it depends on how it's being used? If
> someone decides to e.g. make a file browser that installs watches for
> a bunch of mountpoints for some fancy sidebar showing the device
> mounts on the system, or something like that, that probably shouldn't
> inhibit unmounting... I don't know if that's a realistic use case.

In such a use case, I would envision the browser putting a watch on "/".  A
watch sees all events in the subtree rooted at that point and you must apply a
filter that filters them out if you're not interested (filter on
WATCH_INFO_IN_SUBTREE using info_filter and info_mask).

David