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

[Ming Lei]

On Mon, Oct 31, 2016 at 11:11 PM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> 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.

Looks _pages & _bvec is better and still a little confusing and not reflect
its real purpose from user view, since both points to real bvec. Could we
just rename _rd as bio_for_each_segment_all_ro() which means the pointed
bvec is readonly and not introduce _wt?


Thanks,
Ming Lei