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

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Date:   Thu, 06 Sep 2018 13:52:29 +0200
From:   Yann Droneaud <ydroneaud@...eya.com>
To:     David Howells <dhowells@...hat.com>
Cc:     linux-api@...r.kernel.org, linux-kbuild@...r.kernel.org,
        Jan Harkes <jaharkes@...cmu.edu>, coda@...cmu.edu,
        codalist@...a.cs.cmu.edu, 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

Hi,

Le jeudi 06 septembre 2018 à 08:13 +0100, David Howells a écrit :
> Yann Droneaud <ydroneaud@...eya.com> wrote:
> 
> > 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 ... 
> > ...
> > All CODA_REQ_* defines internals to kernel side and not exchanged
> > with
> > userspace.
> > 
> > Please move them back to <linux/coda_psdev.h>
> 
> Is there any reason coda_psdev.h needs to be in include/linux/ rather
> than fs/coda/?
> 

It's a valid concern.

At first I thought the first lines (see below) could have been useful
for userspace:

  #define CODA_PSDEV_MAJOR 67
  #define MAX_CODADEVS  5    /* how many do we allow */


But the file was unsuable for a long long time so we can assume it's
usage by userspace is deprecated, then we could remove it from UAPI,
and moves its content back to include/linux.

As one could see include/linux/coda_psdev.h is not used outside of
fs/coda, moving the header here as you suggests seems to be the correct
solution.

Regards.

-- 
Yann Droneaud
OPTEYA