Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

m_copyback0: add comments and assertions.

This commit is contained in:
yamt 2006-03-15 10:40:30 +00:00
parent 37b7f4fbd8
commit 2ff5a7c85c
1 changed files with 12 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
sys/kern/uipc_mbuf.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: uipc_mbuf.c,v 1.105 2006/01/24 13:02:58 yamt Exp $ */
/* $NetBSD: uipc_mbuf.c,v 1.106 2006/03/15 10:40:30 yamt Exp $ */
/*-
* Copyright (c) 1999, 2001 The NetBSD Foundation, Inc.
@ -69,7 +69,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uipc_mbuf.c,v 1.105 2006/01/24 13:02:58 yamt Exp $");
__KERNEL_RCSID(0, "$NetBSD: uipc_mbuf.c,v 1.106 2006/03/15 10:40:30 yamt Exp $");
#include "opt_mbuftrace.h"
#include "opt_ddb.h"
@ -1152,6 +1152,13 @@ m_copyback0(struct mbuf **mp0, int off, int len, const void *vp, int flags,
KASSERT((flags & M_COPYBACK0_PRESERVE) == 0 || cp == NULL);
KASSERT((flags & M_COPYBACK0_COPYBACK) == 0 || cp != NULL);
/*
* we don't bother to update "totlen" in the case of M_COPYBACK0_COW,
* assuming that M_COPYBACK0_EXTEND and M_COPYBACK0_COW are exclusive.
*/
KASSERT((~flags & (M_COPYBACK0_EXTEND|M_COPYBACK0_COW)) != 0);
mp = mp0;
m = *mp;
while (off > (mlen = m->m_len)) {
@ -1288,8 +1295,10 @@ m_copyback0(struct mbuf **mp0, int off, int len, const void *vp, int flags,
mp = &m->m_next;
m = m->m_next;
}
out: if (((m = *mp0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen))
out: if (((m = *mp0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen)) {
KASSERT((flags & M_COPYBACK0_EXTEND) != 0);
m->m_pkthdr.len = totlen;
}
return 0;