linux-kernel - Re: [PATCH 16/16] fs: switch ->s_uuid to uuid

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Message-ID: <20170511075825.GB19837@lst.de>
Date:   Thu, 11 May 2017 09:58:25 +0200
From:   Christoph Hellwig <hch@....de>
To:     Amir Goldstein <amir73il@...il.com>
Cc:     Christoph Hellwig <hch@....de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Shaohua Li <shli@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        David Howells <dhowells@...hat.com>,
        Steven Whitehouse <swhiteho@...hat.com>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        linux-raid@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 16/16] fs: switch ->s_uuid to uuid_t

On Wed, May 10, 2017 at 10:08:25PM +0300, Amir Goldstein wrote:
> On Wed, May 10, 2017 at 9:02 PM, Christoph Hellwig <hch@....de> wrote:
> > For some file systems we still memcpy into it, but in various places this
> > already allows us to use the proper uuid helpers.  More to come..
> > Signed-off-by: Christoph Hellwig <hch@....de>
> > ---
> 
> Series looks good!
> 
> My main concern is that filesystems with char uuid[16] are here to stay,
> or maybe, will be converted slowly.

I'll take a stab to convert them ASAP, and add s_uuid support for you
to more file systems once this initial series is done.

> 
> Considering this, perhaps we should have a helper/macro to copy from
> char[16] to *uuid_t and maybe  BUILD_BUG_ON the size comparison?
> #define bytes_to_uuid(dst, src) ...

If the mix of proper types and u8 arrays was to stay that'd be the way
to go, but I'd rather fix things up in a merge window or two instead
of leaving us in a transitionary state forever.