linux-kernel - Re: [PATCH V6 12/30] block: introduce bio

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Date:   Wed, 13 Jun 2018 07:47:41 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...com>, Christoph Hellwig <hch@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Kent Overstreet <kent.overstreet@...il.com>,
        David Sterba <dsterba@...e.cz>,
        Huang Ying <ying.huang@...el.com>,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        Theodore Ts'o <tytso@....edu>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Coly Li <colyli@...e.de>, Filipe Manana <fdmanana@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH V6 12/30] block: introduce bio_chunks()

> +static inline unsigned bio_chunks(struct bio *bio)
> +{
> +	unsigned chunks = 0;
> +	struct bio_vec bv;
> +	struct bvec_iter iter;
>  
> -	return segs;
> +	/*
> +	 * We special case discard/write same/write zeroes, because they
> +	 * interpret bi_size differently:
> +	 */
> +	switch (bio_op(bio)) {
> +	case REQ_OP_DISCARD:
> +	case REQ_OP_SECURE_ERASE:
> +	case REQ_OP_WRITE_ZEROES:
> +		return 0;
> +	case REQ_OP_WRITE_SAME:
> +		return 1;
> +	default:
> +		bio_for_each_chunk(bv, bio, iter)
> +			chunks++;
> +		return chunks;

Shouldn't this just return bio->bi_vcnt?