linux-kernel - Re: [PATCH 13/17] watch_queue: Implement mount topology and attribute change notifications [ver #5]

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Message-ID: <1576646.1596455376@warthog.procyon.org.uk>
Date:   Mon, 03 Aug 2020 12:49:36 +0100
From:   David Howells <dhowells@...hat.com>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     dhowells@...hat.com, Ian Kent <raven@...maw.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        Christian Brauner <christian@...uner.io>, andres@...razel.de,
        Jeff Layton <jlayton@...hat.com>, dray@...hat.com,
        Karel Zak <kzak@...hat.com>, keyrings@...r.kernel.org,
        Linux API <linux-api@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org,
        LSM <linux-security-module@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 13/17] watch_queue: Implement mount topology and attribute change notifications [ver #5]

Miklos Szeredi <miklos@...redi.hu> wrote:

> OTOH mount notification is way smaller and IMO a more mature
> interface.  So just picking the unique ID patch into this set might
> make sense.

But userspace can't retrieve the unique ID without fsinfo() as things stand.

I'm changing it so that the fields are 64-bit, but initialised with the
existing mount ID in the notifications set.  The fsinfo set changes that to a
unique ID.  I'm tempted to make the unique IDs start at UINT_MAX+1 to
disambiguate them.

David