netdev - Re: Data corruption issue with splice() on 2.6.27.10

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Date:	Mon, 12 Jan 2009 13:15:17 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Jens Axboe <jens.axboe@...cle.com>, Willy Tarreau <w@....eu>,
	Changli Gao <xiaosuo@...il.com>,
	Evgeniy Polyakov <zbr@...emap.net>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Data corruption issue with splice() on 2.6.27.10

On Mon, Jan 12, 2009 at 11:02:57PM +1100, Herbert Xu wrote:
> On Wed, Jan 07, 2009 at 11:52:17PM +1100, Herbert Xu wrote:
> > On Wed, Jan 07, 2009 at 12:49:46PM +0000, Jarek Poplawski wrote:
> > > 
> > > Hmm... in any case: take 3
> > 
> > Yes this should fix the corruption but it kind of defeats the
> > purpose of splice by copying the data.
> 
> However, as we don't have a better fix yet, we probably should
> take Jarek's patch for now since data corruption is bad.
> 

I've wondered if something like this could work as a temporary hack?

!!! not compiled/tested !!!
---

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index ce572f9..99b0876 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -264,6 +264,7 @@
 #include <linux/cache.h>
 #include <linux/err.h>
 #include <linux/crypto.h>
+#include <linux/page-flags.h>
 
 #include <net/icmp.h>
 #include <net/tcp.h>
@@ -776,7 +777,8 @@ ssize_t tcp_sendpage(struct socket *sock, struct page *page, int offset,
 	struct sock *sk = sock->sk;
 
 	if (!(sk->sk_route_caps & NETIF_F_SG) ||
-	    !(sk->sk_route_caps & NETIF_F_ALL_CSUM))
+	    !(sk->sk_route_caps & NETIF_F_ALL_CSUM) ||
+	    PageSlab(page))
 		return sock_no_sendpage(sock, page, offset, size, flags);
 
 	lock_sock(sk);
--
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