From owner-svn-src-all@FreeBSD.ORG Thu Aug 29 23:46:39 2013 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id C9BE6E9A; Thu, 29 Aug 2013 23:46:39 +0000 (UTC) (envelope-from np@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id B6664235C; Thu, 29 Aug 2013 23:46:39 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.7/8.14.7) with ESMTP id r7TNkd0b085559; Thu, 29 Aug 2013 23:46:39 GMT (envelope-from np@svn.freebsd.org) Received: (from np@localhost) by svn.freebsd.org (8.14.7/8.14.5/Submit) id r7TNkde1085558; Thu, 29 Aug 2013 23:46:39 GMT (envelope-from np@svn.freebsd.org) Message-Id: <201308292346.r7TNkde1085558@svn.freebsd.org> From: Navdeep Parhar Date: Thu, 29 Aug 2013 23:46:39 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r255047 - head/sys/sys X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 23:46:39 -0000 Author: np Date: Thu Aug 29 23:46:38 2013 New Revision: 255047 URL: http://svnweb.freebsd.org/changeset/base/255047 Log: Add a routine for attaching an mbuf to a buffer with an external refcount. This one is willing to work with buffers that may already be referenced. MEXTADD/m_extadd are suitable only for the first attachment to a cluster -- they initialize the refcount to 1. Modified: head/sys/sys/mbuf.h Modified: head/sys/sys/mbuf.h ============================================================================== --- head/sys/sys/mbuf.h Thu Aug 29 23:11:58 2013 (r255046) +++ head/sys/sys/mbuf.h Thu Aug 29 23:46:38 2013 (r255047) @@ -545,6 +545,28 @@ m_gettype(int size) return (type); } +/* + * Associated an external reference counted buffer with an mbuf. + */ +static __inline void +m_extaddref(struct mbuf *m, caddr_t buf, u_int size, u_int *ref_cnt, + int (*freef)(struct mbuf *, void *, void *), void *arg1, void *arg2) +{ + + KASSERT(ref_cnt != NULL, ("%s: ref_cnt not provided", __func__)); + + atomic_add_int(ref_cnt, 1); + m->m_flags |= M_EXT; + m->m_ext.ext_buf = buf; + m->m_ext.ref_cnt = ref_cnt; + m->m_data = m->m_ext.ext_buf; + m->m_ext.ext_size = size; + m->m_ext.ext_free = freef; + m->m_ext.ext_arg1 = arg1; + m->m_ext.ext_arg2 = arg2; + m->m_ext.ext_type = EXT_EXTREF; +} + static __inline uma_zone_t m_getzone(int size) {