net: skb_copy_datagram_const_iovec()
There's an skb_copy_datagram_iovec() to copy out of a paged skb,
but it modifies the iovec, and does not support starting
at an offset in the destination. We want both in tun.c, so let's
add the function.
It's a carbon copy of skb_copy_datagram_iovec() with enough changes to
be annoying.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 5fd3891..af2b21b 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1717,6 +1717,11 @@
int offset,
struct iovec *from,
int len);
+extern int skb_copy_datagram_const_iovec(const struct sk_buff *from,
+ int offset,
+ const struct iovec *to,
+ int to_offset,
+ int size);
extern void skb_free_datagram(struct sock *sk, struct sk_buff *skb);
extern int skb_kill_datagram(struct sock *sk, struct sk_buff *skb,
unsigned int flags);