diff options
| author |   Alexander Duyck <alexander.h.duyck@intel.com> | 2012-05-02 18:18:42 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-05-03 01:34:37 -0400 |
| commit | 2996d31f9f292cce67cd9105dc0a4a5ee43d2f14 (patch) | |
| tree | 4368e35e13d083a40530c88de554de8d88c0aa41 /net/ipv4 | |
| parent | net: implement tcp coalescing in tcp_queue_rcv() (diff) | |
| download | linux-dev-2996d31f9f292cce67cd9105dc0a4a5ee43d2f14.tar.xz linux-dev-2996d31f9f292cce67cd9105dc0a4a5ee43d2f14.zip | |
net: Stop decapitating clones that have a head_frag
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>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp_input.c | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 2f696ef13dcd..c6f78e2b590f 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -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; } |