linux-kernel - Re: [PATCH 09/60] dm: dm.c: replace 'bio->bi_vcnt == 1' with !bio_multiple

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Message-ID: <20161031152901.GD30919@infradead.org>
Date:   Mon, 31 Oct 2016 08:29:01 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Ming Lei <tom.leiming@...il.com>
Cc:     Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        "maintainer:DEVICE-MAPPER (LVM)" <dm-devel@...hat.com>,
        Shaohua Li <shli@...nel.org>,
        "open list:SOFTWARE RAID (Multiple Disks) SUPPORT" 
        <linux-raid@...r.kernel.org>
Subject: Re: [PATCH 09/60] dm: dm.c: replace 'bio->bi_vcnt == 1' with
 !bio_multiple_segments

On Sat, Oct 29, 2016 at 04:08:08PM +0800, Ming Lei wrote:
> Avoid to access .bi_vcnt directly, because it may be not what
> the driver expected any more after supporting multipage bvec.
> 
> Signed-off-by: Ming Lei <tom.leiming@...il.com>

It would be really nice to have a comment in the code why it's
even checking for multiple segments.