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

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Message-ID: <2488734.1585749502@warthog.procyon.org.uk>
Date:   Wed, 01 Apr 2020 14:58:22 +0100
From:   David Howells <dhowells@...hat.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     dhowells@...hat.com, Miklos Szeredi <miklos@...redi.hu>,
        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()

David Howells <dhowells@...hat.com> wrote:

> > Attached patch applies against readfile patch.
> 
> But doesn't actually do what Karel asked for.  show_mountinfo() itself does
> not give you what Karel asked for.  Plus there's more information you need to
> add to it.

And arguably, it's worse than just reading /proc/mounts.  If you get a
notification that something changed (ie. you poll /proc/mounts or mount
notifications gives you an overrun) you now have to read *every*
/mountfs/*/info file.  That is way more expensive.

David