tree f0a9f05ad00b8a506abeb3b42cb3346cef7d2155
parent e081e1e3ef4682802ac63b1e5e26158fb9ca9e90
author Herbert Xu <herbert@gondor.apana.org.au> 1189984876 -0700
committer David S. Miller <davem@davemloft.net> 1189984876 -0700

[NET] skbuff: Add skb_cow_head

This patch adds an optimised version of skb_cow that avoids the copy if
the header can be modified even if the rest of the payload is cloned.

This can be used in encapsulating paths where we only need to modify the
header.  As it is, this can be used in PPPOE and bridging.

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