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Date: Thu, 10 Aug 2017 04:29:59 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Ming Lei <ming.lei@redhat.com>
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Subject: Re: [PATCH v3 11/49] btrfs: avoid access to .bi_vcnt directly
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 <20170808084548.18963-12-ming.lei@redhat.com>
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> +static unsigned int get_bio_pages(struct bio *bio)
> +{
> +	unsigned i;
> +	struct bio_vec *bv;
> +
> +	bio_for_each_segment_all(bv, bio, i)
> +		;
> +
> +	return i;
> +}

s/get_bio_pages/bio_nr_pages/ ?

Also this seems like a useful helper for bio.h