From e66e9a31474dcce5be6f1186dc933d8a991c707b Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@google.com>
Date: Thu, 19 Apr 2012 09:38:17 +0000
Subject: [PATCH] net: allow better page reuse in splice(sock -> pipe)
splice() from socket to pipe needs linear_to_page() helper to transfert
skb header to part of page.
We can reset the offset in the current sk->sk_sndmsg_page if we are the
last user of the page.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/core/skbuff.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 43c490d52df6..bf257de95d26 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1565,6 +1565,9 @@ static inline struct page *linear_to_page(struct page *page, unsigned int *len,
} else {
unsigned int mlen;
+ /* If we are the only user of the page, we can reset offset */
+ if (page_count(p) == 1)
+ sk->sk_sndmsg_off = 0;
off = sk->sk_sndmsg_off;
mlen = PAGE_SIZE - off;
if (mlen < 64 && mlen < *len) {
--
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