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, 4 deletions

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index ad8a1a1e2275..591bbfa082a0 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1372,8 +1372,7 @@ restart:
                         sz = buf_len;
                         m->msg_flags |= MSG_TRUNC;
                 }
-                res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg),
-                                              m->msg_iov, sz);
+                res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg), m, sz);
                 if (res)
                         goto exit;
                 res = sz;
@@ -1473,8 +1472,8 @@ restart:
                 needed = (buf_len - sz_copied);
                 sz_to_copy = (sz <= needed) ? sz : needed;
 
-                res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset,
-                                              m->msg_iov, sz_to_copy);
+                res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg) + offset,
+                                            m, sz_to_copy);
                 if (res)
                         goto exit;