[3.5.y.z,extended,stable] Patch "tcp: fix MSG_SENDPAGE_NOTLAST logic" has been added to staging queue

Message ID 1358197093-17823-1-git-send-email-herton.krzesinski@canonical.com
State New
Headers show

Commit Message

Herton Ronaldo Krzesinski Jan. 14, 2013, 8:58 p.m.
This is a note to let you know that I have just added a patch titled

    tcp: fix MSG_SENDPAGE_NOTLAST logic

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



From 663ba304005ac179f361078a607ecfec2b88ccc1 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@google.com>
Date: Sun, 6 Jan 2013 18:21:49 +0000
Subject: [PATCH] tcp: fix MSG_SENDPAGE_NOTLAST logic

commit ae62ca7b03217be5e74759dc6d7698c95df498b3 upstream.

commit 35f9c09fe9c72e (tcp: tcp_sendpages() should call tcp_push() once)
added an internal flag : MSG_SENDPAGE_NOTLAST meant to be set on all
frags but the last one for a splice() call.

The condition used to set the flag in pipe_to_sendpage() relied on
splice() user passing the exact number of bytes present in the pipe,
or a smaller one.

But some programs pass an arbitrary high value, and the test fails.

The effect of this bug is a lack of tcp_push() at the end of a
splice(pipe -> socket) call, and possibly very slow or erratic TCP

We should both test sd->total_len and fact that another fragment
is in the pipe (pipe->nrbufs > 1)

Many thanks to Willy for providing very clear bug report, bisection
and test programs.

Reported-by: Willy Tarreau <w@1wt.eu>
Bisected-by: Willy Tarreau <w@1wt.eu>
Tested-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
 fs/splice.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)



diff --git a/fs/splice.c b/fs/splice.c
index 7bf08fa..6cb3acb 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -696,8 +696,10 @@  static int pipe_to_sendpage(struct pipe_inode_info *pipe,
 		return -EINVAL;

 	more = (sd->flags & SPLICE_F_MORE) ? MSG_MORE : 0;
-	if (sd->len < sd->total_len)
+	if (sd->len < sd->total_len && pipe->nrbufs > 1)
 	return file->f_op->sendpage(file, buf->page, buf->offset,
 				    sd->len, &pos, more);