netdev - RE: [PATCH][CFT] Saner error handling in skb_copy_datagram

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6DCFE6C974@AcuExch.aculab.com>
Date:   Tue, 21 Feb 2017 13:25:03 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Al Viro' <viro@...IV.linux.org.uk>,
        David Miller <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "eric.dumazet@...il.com" <eric.dumazet@...il.com>,
        "rlwinm@....org" <rlwinm@....org>,
        "alexmcwhirter@...adic.us" <alexmcwhirter@...adic.us>,
        "chunkeey@...glemail.com" <chunkeey@...glemail.com>
Subject: RE: [PATCH][CFT] Saner error handling in skb_copy_datagram_iter()
 et.al.

From: Al Viro
> Sent: 18 February 2017 00:02
...
> Actually, I've a better solution.  Namely, analogue of iov_iter_advance()
> for going backwards.  The restriction is that you should never unroll
> further than where you've initially started *or* have the iovec, etc.
> array modified under you
...
> +void iov_iter_unroll(struct iov_iter *i, size_t unroll)
...

I'm sure there is a better name, maybe iov_iter_backup() ?

	David