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

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
...@@ -1565,6 +1565,9 @@ static inline struct page *linear_to_page(struct page *page, unsigned int *len, ...@@ -1565,6 +1565,9 @@ static inline struct page *linear_to_page(struct page *page, unsigned int *len,
} else { } else {
unsigned int mlen; 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; off = sk->sk_sndmsg_off;
mlen = PAGE_SIZE - off; mlen = PAGE_SIZE - off;
if (mlen < 64 && mlen < *len) { if (mlen < 64 && mlen < *len) {
......
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