linux-kernel - Re: [PATCH 1/4] inet: Add skb_copy_datagram

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Message-ID: <20141104145538.GA14944@gondor.apana.org.au>
Date:	Tue, 4 Nov 2014 22:55:38 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Benjamin LaHaise <bcrl@...ck.org>
Subject: Re: [PATCH 1/4] inet: Add skb_copy_datagram_iter

On Tue, Nov 04, 2014 at 02:52:22PM +0000, Al Viro wrote:
>
> > Hmm if that is your concern then I don't see how skb_copy_datagram_msg
> > changes things as you'd still have to convert every existing caller
> > of skb_copy_datagram_iovec.  Colour me confused.
> 
> Fewer places having to even think of iovec/iov_iter...

Well it's the difference between

	skb_copy_datagram_iter(..., &kmsghdr->iov_iter, ...)

and

	skb_copy_datagram_msg(..., kmsghdr, ...)

Heck we could even make skb_copy_datagram_msg an inline wrapper
around skb_copy_datagram_iter if you like.

Anyway, the point is that not everything comes with a kmsghdr.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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