Date: Sun, 18 Jan 2009 20:19:55 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r187409 - head/sys/kern Message-ID: <200901182019.n0IKJtIQ086222@svn.freebsd.org>
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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;
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