linux-kernel - Re: [PATCH v2 5/5] staging: lustre: headers: use proper byteorder functions in lustre

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Message-ID: <73FD0668-EDE9-4757-98ED-8A15CE5DA17C@intel.com>
Date:   Tue, 13 Dec 2016 00:55:01 +0000
From:   "Dilger, Andreas" <andreas.dilger@...el.com>
To:     James Simmons <jsimmons@...radead.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        James Simmons <uja.ornl@...oo.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Drokin, Oleg" <oleg.drokin@...el.com>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: Re: [PATCH v2 5/5] staging: lustre: headers: use proper byteorder
 functions in lustre_idl.h

On Dec 12, 2016, at 13:00, James Simmons <jsimmons@...radead.org> wrote:
> 
> 
>> On Sat, Dec 10, 2016 at 01:06:01PM -0500, James Simmons wrote:
>>> In order for lustre_idl.h to be usable for both user
>>> land and kernel space it has to use the proper
>>> byteorder functions.
>> 
>> Why would userspace need/want all of these inline functions?  A uapi
>> header file should just have a the structures that are passed
>> user/kernel and any needed ioctls.  Why would they ever care about
>> strange byte flip functions and a ton of inline functions?
>> 
>> I don't think this is needed, of if it is, I really don't want to see
>> your crazy userspace code...
> 
> Sigh. More cleanups were done based on the idea this was okay. The
> reason this was does was when you look at the headers in
> include/uapi/linux you see a huge number of headers containing a bunch
> of inline function. To an outside project looking to merge their work
> into the kernel they would think this is okay. Hopefully all those
> broken headers will be cleaned up in the near future.
> Alright I will look to fixing up our tools to handle this requirement. 

These accessor functions are used by both the kernel and userspace
tools, and keeping them in the lustre_idl.h header avoids duplication
of code.  Similar usage exists in other filesystem related uapi headers
(e.g. auto_fs4.h, bcache.h, btrfs_tree.h, nilfs2_ondisk.h, swab.h, etc.).

That said, if there is an objection to keeping these macros/inline funcs
in the uapi headers, they still need to exist in the kernel and should
be kept in the lustre/include/lustre directory and we'll keep a separate
copy of the macros for userspace.

Cheers, Andreas