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Commit e66e9a31 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

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: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent acd69962

net/core/skbuff.c

+3 −0
Original line number Diff line number Diff line
@@ -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) {