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From:   Miklos Szeredi <miklos@szeredi.hu>
Date:   Thu, 2 Apr 2020 17:35:54 +0200
Message-ID: <CAJfpegum_PsCfnar8+V2f_VO3k8CJN1LOFJV5OkHRDbQKR=EHg@mail.gmail.com>
Subject: Re: Upcoming: Notifications, FS notifications and fsinfo()
To:     Lennart Poettering <mzxreary@0pointer.de>
Cc:     Ian Kent <raven@themaw.net>, David Howells <dhowells@redhat.com>,
        Christian Brauner <christian.brauner@ubuntu.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Al Viro <viro@zeniv.linux.org.uk>, dray@redhat.com,
        Karel Zak <kzak@redhat.com>,
        Miklos Szeredi <mszeredi@redhat.com>,
        Steven Whitehouse <swhiteho@redhat.com>,
        Jeff Layton <jlayton@redhat.com>, andres@anarazel.de,
        keyrings@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org, Aleksa Sarai <cyphar@cyphar.com>
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On Thu, Apr 2, 2020 at 5:28 PM Lennart Poettering <mzxreary@0pointer.de> wrote:
>
> On Do, 02.04.20 17:22, Miklos Szeredi (miklos@szeredi.hu) wrote:
>
> > On Thu, Apr 2, 2020 at 4:36 PM Lennart Poettering <mzxreary@0pointer.de> wrote:
> >
> > > You appear to be thinking about the "udisks" project or so?
> >
> > Probably.
> >
> > The real question is: is there a sane way to filter mount
> > notifications so that systemd receives only those which it is
> > interested in, rather than the tens of thousands that for example
> > autofs is managing and has nothing to do with systemd?
>
> systemd cares about all mount points in PID1's mount namespace.
>
> The fact that mount tables can grow large is why we want something
> better than constantly reparsing the whole /proc/self/mountinfo. But
> filtering subsets of that is something we don't really care about.

I can accept that, but you haven't given a reason why that's so.

What does it do with the fact that an automount point was crossed, for
example?  How does that affect the operation of systemd?

Thanks,
Miklos