linux-kernel - Re: [RFC PATCH 08/17] block: refactor __bio_copy

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Date:	Tue, 23 Dec 2014 02:45:51 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Dongsu Park <dongsu.park@...fitbricks.com>
Cc:	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	Kent Overstreet <kmo@...erainc.com>,
	Ming Lin <mlin@...ggr.net>, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC PATCH 08/17] block: refactor __bio_copy_iov()

>  static int __bio_copy_iov(struct bio *bio, const struct iov_iter *iter,
> +			  int to_iov)
>  {
> +	int i;
>  	struct bio_vec *bvec;
>  	struct iov_iter iov_iter = *iter;

Why not pass the iov_iter by value?

>  	bio_for_each_segment_all(bvec, bio, i) {
> +		ssize_t ret;
> +
> +		if (to_iov == WRITE)
> +			ret = copy_page_to_iter(bvec->bv_page,
> +						bvec->bv_offset,
> +						bvec->bv_len,
> +						&iov_iter);
> +		else
> +			ret = copy_page_from_iter(bvec->bv_page,
> +						  bvec->bv_offset,
> +						  bvec->bv_len,
> +						  &iov_iter);
> +
> +		if (!iov_iter_count(&iov_iter))
> +			break;
>  
> +		if (ret < bvec->bv_len)
> +			return -EFAULT;
>  	}
>  
> +	return 0;

Seems like this should be split into two functions for the read
and write cases?

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