linux-ext4 - Re: [PATCH V10 01/19] block: introduce multi-page page bvec helpers

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Message-ID: <20181119022327.GC10838@ming.t460p>
Date:   Mon, 19 Nov 2018 10:23:28 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>, 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 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.

So what is the solution we should take for moving on?

> 
> > + * This helpers are for building sp bvec in flight.
> 
> Please spell out single page, sp is not easy understandable.

OK.

Thanks,
Ming