netdev - Re: [RFC] situation with csum_and_copy

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Message-ID: <CA+55aFy4d1uii5078NxT7E9cTCbHfpgMitA4goHJadRGM8pshg@mail.gmail.com>
Date:	Fri, 21 Nov 2014 11:40:49 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	David Laight <David.Laight@...lab.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"target-devel@...r.kernel.org" <target-devel@...r.kernel.org>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFC] situation with csum_and_copy_... API

On Fri, Nov 21, 2014 at 11:39 AM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> I'm not at all sure that _anything_ has valid reasons for draining iovecs.
> Maintaining a struct iov_iter and modifying it is easy and actually faster...

For new code, I agree. But the whole "draining iovec's" is a fairly
common old model.

                  Linus
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