put iov_iter into msghdr

Note that the code _using_ ->msg_iter at that point will be very
unhappy with anything other than unshifted iovec-backed iov_iter.
We still need to convert users to proper primitives.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index cdedcf1..b50861b 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -755,11 +755,13 @@
 	struct msghdr *msg = from;
 
 	if (skb->ip_summed == CHECKSUM_PARTIAL) {
-		if (memcpy_fromiovecend(to, msg->msg_iov, offset, len) < 0)
+		/* XXX: stripping const */
+		if (memcpy_fromiovecend(to, (struct iovec *)msg->msg_iter.iov, offset, len) < 0)
 			return -EFAULT;
 	} else {
 		__wsum csum = 0;
-		if (csum_partial_copy_fromiovecend(to, msg->msg_iov, offset, len, &csum) < 0)
+		/* XXX: stripping const */
+		if (csum_partial_copy_fromiovecend(to, (struct iovec *)msg->msg_iter.iov, offset, len, &csum) < 0)
 			return -EFAULT;
 		skb->csum = csum_block_add(skb->csum, csum, odd);
 	}
diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index 8dd4ae0..c0d82f7 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -811,7 +811,8 @@
 	pfh.icmph.checksum = 0;
 	pfh.icmph.un.echo.id = inet->inet_sport;
 	pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
-	pfh.iov = msg->msg_iov;
+	/* XXX: stripping const */
+	pfh.iov = (struct iovec *)msg->msg_iter.iov;
 	pfh.wcheck = 0;
 	pfh.family = AF_INET;
 
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 5d83bd2..0bb68df 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -625,7 +625,8 @@
 back_from_confirm:
 
 	if (inet->hdrincl)
-		err = raw_send_hdrinc(sk, &fl4, msg->msg_iov, len,
+		/* XXX: stripping const */
+		err = raw_send_hdrinc(sk, &fl4, (struct iovec *)msg->msg_iter.iov, len,
 				      &rt, msg->msg_flags);
 
 	 else {
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 4a96f37..54ba620 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1085,7 +1085,7 @@
 int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 		size_t size)
 {
-	struct iovec *iov;
+	const struct iovec *iov;
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct sk_buff *skb;
 	int iovlen, flags, err, copied = 0;
@@ -1136,8 +1136,8 @@
 	mss_now = tcp_send_mss(sk, &size_goal, flags);
 
 	/* Ok commence sending. */
-	iovlen = msg->msg_iovlen;
-	iov = msg->msg_iov;
+	iovlen = msg->msg_iter.nr_segs;
+	iov = msg->msg_iter.iov;
 	copied = 0;
 
 	err = -EPIPE;
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index f5bd4bd..3e225b0 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -3050,7 +3050,7 @@
 	syn_data->ip_summed = CHECKSUM_PARTIAL;
 	memcpy(syn_data->cb, syn->cb, sizeof(syn->cb));
 	if (unlikely(memcpy_fromiovecend(skb_put(syn_data, space),
-					 fo->data->msg_iov, 0, space))) {
+					 fo->data->msg_iter.iov, 0, space))) {
 		kfree_skb(syn_data);
 		goto fallback;
 	}