linux-kernel - Re: [PATCH v3 09/49] block: comment on bio_iov_iter_get

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Message-ID: <20170810112805.GE20308@infradead.org>
Date:   Thu, 10 Aug 2017 04:28:05 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...com>, Christoph Hellwig <hch@...radead.org>,
        Huang Ying <ying.huang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v3 09/49] block: comment on bio_iov_iter_get_pages()

> + * The hacking way of using bvec table as page pointer array is safe
> + * even after multipage bvec is introduced because that space can be
> + * thought as unused by bio_add_page().

I'm not sure what value this comment adds.

Note that once we have multi-page biovecs this could should change
to take advantage of multipage biovecs, so adding a comment before
that doesn't seem too helpful.