From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Tue, 20 Oct 2009 15:19:18 +0900

quoted text
> When doing network IO on behalf of guests, a Xen dom0 kernel gets granted
> pages from guests.  These pages cannot be released normally, so we must
> handle releasing them specially, which can do with a skb_destructor.
> 
> This is complicated by the fact that the lifetime of an skb's
> frags can be extended via cloning.  To address this, this patch adds
> alloc_skb_mustcopy() which allocates an skb with fclone==SKB_MUST_COPY.
> If skb_clone() sees an skb with this set, it simply calls skb_copy
> instead so that there are no aliases to the granted pages.
> 
> /* Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> */

This looks perfectly fine to me.

Let me know if it actually works out for you and we can merge
this.
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