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

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Message-ID: <CAJfpegvT-UznTC5CT1kjVF=Gr+DfTJXKj5CEkP67G9zFhjLMEg@mail.gmail.com>
Date:   Wed, 5 Aug 2020 13:56:01 +0200
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Ian Kent <raven@...maw.net>
Cc:     David Howells <dhowells@...hat.com>,
        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]

On Wed, Aug 5, 2020 at 1:36 PM Ian Kent <raven@...maw.net> wrote:
>

> I can see in the kernel code that an error is returned if the message
> buffer is full when trying to add a message, I just can't see where
> to get it in the libmount code.
>
> That's not really a communication protocol problem.
>
> Still I need to work out how to detect it, maybe it is seen by
> the code in libmount already and I simply can't see what I need
> to do to recognise it ...
>
> So I'm stuck wanting to verify I have got everything that was
> sent and am having trouble moving on from that.

This is the commit that should add the overrun detection capability:

e7d553d69cf6 ("pipe: Add notification lossage handling")

Thanks,
Miklos