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, 3 insertions, 3 deletions

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index e96884380732..5eee625d113f 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1825,7 +1825,7 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
         else if (size < skb->len - skip)
                 msg->msg_flags |= MSG_TRUNC;
 
-        err = skb_copy_datagram_iovec(skb, skip, msg->msg_iov, size);
+        err = skb_copy_datagram_msg(skb, skip, msg, size);
         if (err)
                 goto out_free;
 
@@ -2030,8 +2030,8 @@ again:
                 }
 
                 chunk = min_t(unsigned int, unix_skb_len(skb) - skip, size);
-                if (skb_copy_datagram_iovec(skb, UNIXCB(skb).consumed + skip,
-                                            msg->msg_iov, chunk)) {
+                if (skb_copy_datagram_msg(skb, UNIXCB(skb).consumed + skip,
+                                          msg, chunk)) {
                         if (copied == 0)
                                 copied = -EFAULT;
                         break;