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>
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index e968843..5eee625 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1825,7 +1825,7 @@
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 @@
}
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;