linux-kernel - Re: [PATCH 05/11] UAPI: coda: Don't use internal kernel structs in UAPI

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Date:   Wed, 5 Sep 2018 13:28:58 -0400
From:   Jan Harkes <jaharkes@...cmu.edu>
To:     Yann Droneaud <ydroneaud@...eya.com>
Cc:     David Howells <dhowells@...hat.com>, linux-api@...r.kernel.org,
        linux-kbuild@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/11] UAPI: coda: Don't use internal kernel structs in
 UAPI

On Wed, Sep 05, 2018 at 07:12:37PM +0200, Yann Droneaud wrote:
> Le mercredi 05 septembre 2018 à 16:55 +0100, David Howells a écrit :
> > The size and layout of internal kernel structures may not be relied
> > upon outside of the kernel and may even change in a containerised
> > environment if a container image is frozen and shifted to another
> > machine.
> > 
> > Excise these from Coda's upc_req struct.
...
> 
> This structure should not have been exposed to userspace in the first
> place: it's unusable by userspace as it is. It was incorrect to have it
> outside of #ifdef __KERNEL__ before commit 607ca46e97a1b ... 
...
> So the structure can be moved back to <linux/coda_psdev.h>.

I found a year old patch that clearly fell through the cracks that
fixes this exact thing.

    https://lkml.org/lkml/2017/8/6/186

Jan