net: Add and use skb_copy_datagram_msg() helper.

This encapsulates all of the skb_copy_datagram_iovec() callers
with call argument signature "skb, offset, msghdr->msg_iov, length".

When we move to iov_iters in the networking, the iov_iter object will
sit in the msghdr.

Having a helper like this means there will be less places to touch
during that transformation.

Based upon descriptions and patch from Al Viro.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 075a0fb400e7..0cbcf98f2cab 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -486,11 +486,11 @@ static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
         }
 
         if (skb_csum_unnecessary(skb)) {
-                err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+                err = skb_copy_datagram_msg(skb, 0, msg, copied);
         } else if (msg->msg_flags&MSG_TRUNC) {
                 if (__skb_checksum_complete(skb))
                         goto csum_copy_err;
-                err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+                err = skb_copy_datagram_msg(skb, 0, msg, copied);
         } else {
                 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
                 if (err == -EINVAL)