linux-kernel - Re: Upcoming: Notifications, FS notifications and fsinfo()

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Message-ID: <CAJfpegv4=wAi+mH32pHM9g8gk+JGESWa25n04BwfnkhVBf=3rA@mail.gmail.com>
Date:   Thu, 2 Apr 2020 17:24:32 +0200
From:   Miklos Szeredi <miklos@...redi.hu>
To:     David Howells <dhowells@...hat.com>
Cc:     Karel Zak <kzak@...hat.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>, dray@...hat.com,
        Miklos Szeredi <mszeredi@...hat.com>,
        Steven Whitehouse <swhiteho@...hat.com>,
        Jeff Layton <jlayton@...hat.com>, Ian Kent <raven@...maw.net>,
        andres@...razel.de, keyrings@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lennart Poettering <lennart@...ttering.net>,
        Aleksa Sarai <cyphar@...har.com>
Subject: Re: Upcoming: Notifications, FS notifications and fsinfo()

On Thu, Apr 2, 2020 at 5:23 PM David Howells <dhowells@...hat.com> wrote:
>
> Miklos Szeredi <miklos@...redi.hu> wrote:
>
> > > > Not sure what you mean.  I think it shows precisely the information
> > > > Karel asked for.
> > >
> > > It's not atomic.
> >
> > Yes it is.
>
> No, it really isn't - though it could be made so.
>
> ext4_show_mount(), for example, doesn't lock against "mount -o remount", so
> the configuration can be changing whilst it's being rendered to text.

Does s_umount nest inside namespace_sem?  I really don't see the
relation of those locks.

Thanks,
Miklos