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Date: Mon, 31 Oct 2016 08:11:23 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Theodore Ts'o <tytso@mit.edu>, Ming Lei <tom.leiming@gmail.com>,
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Subject: Re: [PATCH 45/60] block: bio: introduce
 bio_for_each_segment_all_rd() and its write pair
Message-ID: <20161031151123.GA3193@infradead.org>
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 <1477728600-12938-46-git-send-email-tom.leiming@gmail.com>
 <20161031135943.36crigad55hwmmrl@thunk.org>
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On Mon, Oct 31, 2016 at 09:59:43AM -0400, Theodore Ts'o wrote:
> What is _rd and _wt supposed to stand for?

I think it's read and write, but I think the naming is highly
unfortunate.  I started dabbling around with the patches a bit,
and to keep my sanity a started reaming it to _pages and _bvec
which is the real semantics - the _rd or _pages gives you a synthetic
bvec for each page, and the other one gives you the full bvec.