linux-kernel - [PATCH 3.2 110/185] net: update consumers of MSG_MORE to recognize MSG_SENDPAGE

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Message-ID: <lsq.1388282924.401792882@decadent.org.uk>
Date:	Sun, 29 Dec 2013 03:08:44 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Shawn Landden" <shawn@...rchofgit.com>,
	"Eric Dumazet" <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Tom Herbert" <therbert@...gle.com>
Subject: [PATCH 3.2 110/185] net: update consumers of MSG_MORE to
 recognize MSG_SENDPAGE_NOTLAST

3.2.54-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Shawn Landden <shawn@...rchofgit.com>

commit d3f7d56a7a4671d395e8af87071068a195257bf6 upstream.

Commit 35f9c09fe (tcp: tcp_sendpages() should call tcp_push() once)
added an internal flag MSG_SENDPAGE_NOTLAST, similar to
MSG_MORE.

algif_hash, algif_skcipher, and udp used MSG_MORE from tcp_sendpages()
and need to see the new flag as identical to MSG_MORE.

This fixes sendfile() on AF_ALG.

v3: also fix udp

Cc: Tom Herbert <therbert@...gle.com>
Cc: Eric Dumazet <eric.dumazet@...il.com>
Cc: David S. Miller <davem@...emloft.net>
Reported-and-tested-by: Shawn Landden <shawnlandden@...il.com>
Original-patch: Richard Weinberger <richard@....at>
Signed-off-by: Shawn Landden <shawn@...rchofgit.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 crypto/algif_hash.c     | 3 +++
 crypto/algif_skcipher.c | 3 +++
 net/ipv4/udp.c          | 3 +++
 3 files changed, 9 insertions(+)

--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -114,6 +114,9 @@ static ssize_t hash_sendpage(struct sock
 	struct hash_ctx *ctx = ask->private;
 	int err;
 
+	if (flags & MSG_SENDPAGE_NOTLAST)
+		flags |= MSG_MORE;
+
 	lock_sock(sk);
 	sg_init_table(ctx->sgl.sg, 1);
 	sg_set_page(ctx->sgl.sg, page, size, offset);
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -378,6 +378,9 @@ static ssize_t skcipher_sendpage(struct
 	struct skcipher_sg_list *sgl;
 	int err = -EINVAL;
 
+	if (flags & MSG_SENDPAGE_NOTLAST)
+		flags |= MSG_MORE;
+
 	lock_sock(sk);
 	if (!ctx->more && ctx->used)
 		goto unlock;
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1036,6 +1036,9 @@ int udp_sendpage(struct sock *sk, struct
 	struct udp_sock *up = udp_sk(sk);
 	int ret;
 
+	if (flags & MSG_SENDPAGE_NOTLAST)
+		flags |= MSG_MORE;
+
 	if (!up->pending) {
 		struct msghdr msg = {	.msg_flags = flags|MSG_MORE };
 

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