From owner-svn-src-all@FreeBSD.ORG  Sun Jan 18 20:19:55 2009
Return-Path: <owner-svn-src-all@FreeBSD.ORG>
Delivered-To: svn-src-all@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 9C7DE10656F4;
	Sun, 18 Jan 2009 20:19:55 +0000 (UTC) (envelope-from mav@FreeBSD.org)
Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c])
	by mx1.freebsd.org (Postfix) with ESMTP id 8BFD68FC1E;
	Sun, 18 Jan 2009 20:19:55 +0000 (UTC) (envelope-from mav@FreeBSD.org)
Received: from svn.freebsd.org (localhost [127.0.0.1])
	by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id n0IKJt8W086223;
	Sun, 18 Jan 2009 20:19:55 GMT (envelope-from mav@svn.freebsd.org)
Received: (from mav@localhost)
	by svn.freebsd.org (8.14.3/8.14.3/Submit) id n0IKJtIQ086222;
	Sun, 18 Jan 2009 20:19:55 GMT (envelope-from mav@svn.freebsd.org)
Message-Id: <200901182019.n0IKJtIQ086222@svn.freebsd.org>
From: Alexander Motin <mav@FreeBSD.org>
Date: Sun, 18 Jan 2009 20:19:55 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
	svn-src-head@freebsd.org
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: 
Subject: svn commit: r187409 - head/sys/kern
X-BeenThere: svn-src-all@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "SVN commit messages for the entire src tree \(except for &quot;
	user&quot; and &quot; projects&quot; \)" <svn-src-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-all>
List-Post: <mailto:svn-src-all@freebsd.org>
List-Help: <mailto:svn-src-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 18 Jan 2009 20:19:56 -0000

Author: mav
Date: Sun Jan 18 20:19:55 2009
New Revision: 187409
URL: http://svn.freebsd.org/changeset/base/187409

Log:
  Teach m_copyback() to use trailing space of the last mbuf in chain.

Modified:
  head/sys/kern/uipc_mbuf.c

Modified: head/sys/kern/uipc_mbuf.c
==============================================================================
--- head/sys/kern/uipc_mbuf.c	Sun Jan 18 19:56:13 2009	(r187408)
+++ head/sys/kern/uipc_mbuf.c	Sun Jan 18 20:19:55 2009	(r187409)
@@ -1271,6 +1271,10 @@ m_copyback(struct mbuf *m0, int off, int
 		m = m->m_next;
 	}
 	while (len > 0) {
+		if (m->m_next == NULL && (len > m->m_len - off)) {
+			m->m_len += min(len - (m->m_len - off),
+			    M_TRAILINGSPACE(m));
+		}
 		mlen = min (m->m_len - off, len);
 		bcopy(cp, off + mtod(m, caddr_t), (u_int)mlen);
 		cp += mlen;