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net: Stop decapitating clones that have a head_frag

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This change is meant ot prevent stealing the skb->head to use as a page in
the event that the skb->head was cloned.  This allows the other clones to
track each other via shinfo->dataref.

Without this we break down to two methods for tracking the reference count,
one being dataref, the other being the page count.  As a result it becomes
difficult to track how many references there are to skb->head.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2012-05-02 18:18:42 +00:00 • committed by David S. Miller
parent b081f85c29
commit 2996d31f9f
2 changed files with 7 additions and 11 deletions
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9
net/ipv4/tcp_input.c
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@ -4589,7 +4589,7 @@ copyfrags:
to->data_len += len;
goto merge;
}
if (from->head_frag) {
if (from->head_frag && !skb_cloned(from)) {
struct page *page;
unsigned int offset;
@ -4599,12 +4599,7 @@ copyfrags:
offset = from->data - (unsigned char *)page_address(page);
skb_fill_page_desc(to, skb_shinfo(to)->nr_frags,
page, offset, skb_headlen(from));
if (skb_cloned(from))
get_page(page);
else
*fragstolen = true;
*fragstolen = true;
delta = len; /* we dont know real truesize... */
goto copyfrags;
}