linux-kernel - Re: [PATCH V10 01/19] block: introduce multi-page page bvec helpers

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Date:   Mon, 19 Nov 2018 11:35:14 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Christoph Hellwig <hch@....de>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Dave Chinner <dchinner@...hat.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, Shaohua Li <shli@...nel.org>,
        linux-raid@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org, Gao Xiang <gaoxiang25@...wei.com>,
        Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org,
        Coly Li <colyli@...e.de>, linux-bcache@...r.kernel.org,
        Boaz Harrosh <ooo@...ctrozaur.com>,
        Bob Peterson <rpeterso@...hat.com>, cluster-devel@...hat.com
Subject: Re: [PATCH V10 01/19] block: introduce multi-page page bvec helpers

On Sun, Nov 18, 2018 at 08:10:14PM -0700, Jens Axboe wrote:
> On 11/18/18 7:23 PM, Ming Lei wrote:
> > On Fri, Nov 16, 2018 at 02:13:05PM +0100, Christoph Hellwig wrote:
> >>> -#define bvec_iter_page(bvec, iter)				\
> >>> +#define mp_bvec_iter_page(bvec, iter)				\
> >>>  	(__bvec_iter_bvec((bvec), (iter))->bv_page)
> >>>  
> >>> -#define bvec_iter_len(bvec, iter)				\
> >>> +#define mp_bvec_iter_len(bvec, iter)				\
> >>
> >> I'd much prefer if we would stick to the segment naming that
> >> we also use in the higher level helper.
> >>
> >> So segment_iter_page, segment_iter_len, etc.
> > 
> > We discussed the naming problem before, one big problem is that the 'segment'
> > in bio_for_each_segment*() means one single page segment actually.
> > 
> > If we use segment_iter_page() here for multi-page segment, it may
> > confuse people.
> > 
> > Of course, I prefer to the naming of segment/page, 
> > 
> > And Jens didn't agree to rename bio_for_each_segment*() before.
> 
> I didn't like frivolous renaming (and I still don't), but mp_
> is horrible imho. Don't name these after the fact that they
> are done in conjunction with supporting multipage bvecs. That
> very fact will be irrelevant very soon

OK, so what is your suggestion for the naming issue?

Are you fine to use segment_iter_page() here? Then the term of 'segment'
may be interpreted as multi-page segment here, but as single-page in
bio_for_each_segment*().

thanks
Ming