From 0c33f36dd83c00ff764d2c1479f51c8e5d5deb53 Mon Sep 17 00:00:00 2001
From: Jeffrey Hsu <hsu@dragonflybsd.org>
Date: Sat, 27 Mar 2004 11:50:45 +0000
Subject: [PATCH] Pull out m_uiomove() functionality from sosend().

---
 sys/kern/uipc_mbuf.c | 63 +++++++++++++++++++++++++++++++++++++++++++-
 sys/sys/mbuf.h       |  5 +++-
 2 files changed, 66 insertions(+), 2 deletions(-)

diff --git a/sys/kern/uipc_mbuf.c b/sys/kern/uipc_mbuf.c
index 25c706291b..c78537403c 100644
--- a/sys/kern/uipc_mbuf.c
+++ b/sys/kern/uipc_mbuf.c
@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2004 Jeffrey M. Hsu.  All rights reserved.
  * Copyright (c) 1982, 1986, 1988, 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
@@ -32,7 +33,7 @@
  *
  *	@(#)uipc_mbuf.c	8.2 (Berkeley) 1/4/94
  * $FreeBSD: src/sys/kern/uipc_mbuf.c,v 1.51.2.24 2003/04/15 06:59:29 silby Exp $
- * $DragonFly: src/sys/kern/uipc_mbuf.c,v 1.14 2003/12/28 06:11:32 dillon Exp $
+ * $DragonFly: src/sys/kern/uipc_mbuf.c,v 1.15 2004/03/27 11:50:45 hsu Exp $
  */
 
 #include "opt_param.h"
@@ -45,6 +46,7 @@
 #include <sys/sysctl.h>
 #include <sys/domain.h>
 #include <sys/protosw.h>
+#include <sys/uio.h>
 #include <sys/thread.h>
 #include <sys/globaldata.h>
 
@@ -1674,3 +1676,62 @@ nospace:
 		m_freem(m_final);
 	return (NULL);
 }
+
+/*
+ * Move data from uio into mbufs.
+ * A length of zero means copy the whole uio.
+ */
+struct mbuf *
+m_uiomove(struct uio *uio, int wait, int len0)
+{
+	struct mbuf *head;		/* result mbuf chain */
+	struct mbuf *m;			/* current working mbuf */
+	struct mbuf **mp;
+	int resid, datalen, error;
+
+	resid = (len0 == 0) ? uio->uio_resid : min(len0, uio->uio_resid);
+
+	head = NULL;
+	mp = &head;
+	do {
+		if (resid > MHLEN) {
+			m = m_getcl(wait, MT_DATA, head == NULL ? M_PKTHDR : 0);
+			if (m == NULL)
+				goto failed;
+			if (m->m_flags & M_PKTHDR)
+				m->m_pkthdr.len = 0;
+		} else {
+			if (head == NULL) {
+				MGETHDR(m, wait, MT_DATA);
+				if (m == NULL)
+					goto failed;
+				m->m_pkthdr.len = 0;
+				/* Leave room for protocol headers. */
+				if (resid < MHLEN)
+					MH_ALIGN(m, resid);
+			} else {
+				MGET(m, wait, MT_DATA);
+				if (m == NULL)
+					goto failed;
+			}
+		}
+		datalen = min(MCLBYTES, resid);
+		error = uiomove(mtod(m, caddr_t), datalen, uio);
+		if (error) {
+			m_free(m);
+			goto failed;
+		}
+		m->m_len = datalen;
+		*mp = m;
+		mp = &m->m_next;
+		head->m_pkthdr.len += datalen;
+		resid -= datalen;
+	} while (resid > 0);
+
+	return (head);
+
+failed:
+	if (head)
+		m_freem(head);
+	return (NULL);
+}
diff --git a/sys/sys/mbuf.h b/sys/sys/mbuf.h
index 9581dbbab6..92aab7599a 100644
--- a/sys/sys/mbuf.h
+++ b/sys/sys/mbuf.h
@@ -32,7 +32,7 @@
  *
  *	@(#)mbuf.h	8.5 (Berkeley) 2/19/95
  * $FreeBSD: src/sys/sys/mbuf.h,v 1.44.2.17 2003/04/15 06:15:02 silby Exp $
- * $DragonFly: src/sys/sys/mbuf.h,v 1.8 2003/12/28 06:11:33 dillon Exp $
+ * $DragonFly: src/sys/sys/mbuf.h,v 1.9 2004/03/27 11:50:45 hsu Exp $
  */
 
 #ifndef _SYS_MBUF_H_
@@ -459,6 +459,8 @@ extern	struct mbuf	*mmbfree;
 extern	int		 nmbclusters;
 extern	int		 nmbufs;
 
+struct uio;
+
 void		 m_adj(struct mbuf *, int);
 void		 m_cat(struct mbuf *, struct mbuf *);
 int		 m_clalloc(int, int);
@@ -489,6 +491,7 @@ struct	mbuf	*m_pullup(struct mbuf *, int);
 struct	mbuf	*m_retry(int, int);
 struct	mbuf	*m_retryhdr(int, int);
 struct	mbuf	*m_split(struct mbuf *, int, int);
+struct	mbuf 	*m_uiomove(struct uio *, int, int);
 caddr_t		m_mclalloc(int how);
 void		m_mclget(struct mbuf *m, int how);
 void		m_mclfree(caddr_t data);
-- 
2.41.0