linux-kernel - Re: [PATCH V6 00/30] block: support multipage bvec

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Date:   Mon, 11 Jun 2018 09:48:06 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...com>, Christoph Hellwig <hch@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Kent Overstreet <kent.overstreet@...il.com>,
        David Sterba <dsterba@...e.cz>,
        Huang Ying <ying.huang@...el.com>,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        Theodore Ts'o <tytso@....edu>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Coly Li <colyli@...e.de>, Filipe Manana <fdmanana@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH V6 00/30] block: support multipage bvec

І think the new naming scheme in this series is a nightmare.  It
confuses the heck out of me, and that is despite knowing many bits of
the block layer inside out, and reviewing previous series.

I think we need to take a step back and figure out what names what we
want in the end, and how we get there separately.

For the end result using bio_for_each_page in some form for the per-page
iteration seems like the only sensible idea, as that is what it does.

For the bio-vec iteration I'm fine with either bio_for_each_bvec as that
exactly explains what it does, or bio_for_each_segment to keep the
change at a minimum.

And in terms of how to get there: maybe we need to move all the drivers
and file systems to the new names first before the actual changes to
document all the intent.  For that using the bio_for_each_bvec variant
might be benefitial as it allows to seasily see the difference between
old uncovered code and the already converted one.