[INET]: Fix truesize setting in ip_append_data

As it is ip_append_data only counts page fragments to the skb that
allocated it.  As such it means that the first skb gets hit with a
4K charge even though it might have only used a fraction of it while
all subsequent skb's that use the same page gets away with no charge
at all.

This bug was exposed by the UDP accounting patch.

[ The wmem_alloc bumping needs to be moved with the truesize,
  noticed by Takahiro Yasui.  -DaveM ]

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 480469b92aa7..bc9e57550e86 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1016,8 +1016,6 @@ alloc_new_skb:
 
                                 skb_fill_page_desc(skb, i, page, 0, 0);
                                 frag = &skb_shinfo(skb)->frags[i];
-                                skb->truesize += PAGE_SIZE;
-                                atomic_add(PAGE_SIZE, &sk->sk_wmem_alloc);
                         } else {
                                 err = -EMSGSIZE;
                                 goto error;
@@ -1030,6 +1028,8 @@ alloc_new_skb:
                         frag->size += copy;
                         skb->len += copy;
                         skb->data_len += copy;
+                        skb->truesize += copy;
+                        atomic_add(copy, &sk->sk_wmem_alloc);
                 }
                 offset += copy;
                 length -= copy;