Re: [PATCH 45/60] block: bio: introduce bio_for_each_segment_all_rd() and its write pair

[Christoph Hellwig]

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.