Re: [PATCH v3 04/49] mm: page_io.c: comment on direct access to bvec table

To: Ming Lei <ming.lei@xxxxxxxxxx>
Subject: Re: [PATCH v3 04/49] mm: page_io.c: comment on direct access to bvec table
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 10 Aug 2017 04:14:43 -0700
Cc: Jens Axboe <axboe@xxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Huang Ying <ying.huang@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx
In-reply-to: <20170808084548.18963-5-ming.lei@redhat.com>
User-agent: Mutt/1.8.3 (2017-05-23)

Can we just add a bio_first_page macro that always return the first
page in the bio?

References:
- [PATCH v3 00/49] block: support multipage bvec
  - From: Ming Lei
- [PATCH v3 04/49] mm: page_io.c: comment on direct access to bvec table
  - From: Ming Lei