linux-kernel - Re: [PATCH v1 01/14] block: introduce bio_segments

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Message-ID: <CACVXFVMjf0trmc8jggdYUm8k1HS+vHa26=godzJ-jQ_23yha0w@mail.gmail.com>
Date:   Tue, 28 Feb 2017 20:15:37 +0800
From:   Ming Lei <tom.leiming@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Shaohua Li <shli@...nel.org>, Jens Axboe <axboe@...com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:SOFTWARE RAID (Multiple Disks) SUPPORT" 
        <linux-raid@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>
Subject: Re: [PATCH v1 01/14] block: introduce bio_segments_all()

On Sun, Feb 26, 2017 at 2:22 AM, Christoph Hellwig <hch@...radead.org> wrote:
>> +static inline unsigned bio_segments_all(struct bio *bio)
>> +{
>> +     WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));
>> +
>> +     return bio->bi_vcnt;
>> +}
>
> I don't think this helpers really adds any benefit.

IMO the first benefit is that misusing of .bi_vcnt can be warned, and
another one is that we have to introduce this helper if multipage bvec
is supported.

Thanks,
Ming Lei