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authorEric Dumazet <edumazet@google.com>2013-01-06 18:21:49 +0000
committerDavid S. Miller <davem@davemloft.net>2013-01-06 20:58:13 -0800
commitae62ca7b03217be5e74759dc6d7698c95df498b3 (patch)
tree417481b4ddfbd7f05589ae331b41f20939391b50 /fs/splice.c
parentnet/ipv4/ipconfig: really display the BOOTP/DHCP server's address. (diff)
downloadlinux-dev-ae62ca7b03217be5e74759dc6d7698c95df498b3.tar.xz
linux-dev-ae62ca7b03217be5e74759dc6d7698c95df498b3.zip
tcp: fix MSG_SENDPAGE_NOTLAST logic
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 sessions. 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>
Diffstat (limited to 'fs/splice.c')
-rw-r--r--fs/splice.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/splice.c b/fs/splice.c
index 8890604e3fcd..6909d89d0da5 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)
more |= MSG_SENDPAGE_NOTLAST;
+
return file->f_op->sendpage(file, buf->page, buf->offset,
sd->len, &pos, more);
}