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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20141223104551.GC27600@infradead.org>
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?

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/