From owner-svn-src-all@FreeBSD.ORG Sun Aug 31 21:43:29 2014 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 0647C561; Sun, 31 Aug 2014 21:43:29 +0000 (UTC) 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)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id CCB8A1D8C; Sun, 31 Aug 2014 21:43:28 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.9/8.14.9) with ESMTP id s7VLhSiU086755; Sun, 31 Aug 2014 21:43:28 GMT (envelope-from trasz@FreeBSD.org) Received: (from trasz@localhost) by svn.freebsd.org (8.14.9/8.14.9/Submit) id s7VLhSFV086754; Sun, 31 Aug 2014 21:43:28 GMT (envelope-from trasz@FreeBSD.org) Message-Id: <201408312143.s7VLhSFV086754@svn.freebsd.org> X-Authentication-Warning: svn.freebsd.org: trasz set sender to trasz@FreeBSD.org using -f From: Edward Tomasz Napierala Date: Sun, 31 Aug 2014 21:43:28 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r270894 - stable/10/sys/fs/autofs X-SVN-Group: stable-10 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: 2.1.18-1 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: Sun, 31 Aug 2014 21:43:29 -0000 Author: trasz Date: Sun Aug 31 21:43:28 2014 New Revision: 270894 URL: http://svnweb.freebsd.org/changeset/base/270894 Log: MFC r270207: Rework ".." lookup; previous one failed to properly busy the mountpoint. Reviewed by: kib@ Sponsored by: The FreeBSD Foundation Modified: stable/10/sys/fs/autofs/autofs_vnops.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/fs/autofs/autofs_vnops.c ============================================================================== --- stable/10/sys/fs/autofs/autofs_vnops.c Sun Aug 31 21:38:03 2014 (r270893) +++ stable/10/sys/fs/autofs/autofs_vnops.c Sun Aug 31 21:43:28 2014 (r270894) @@ -198,6 +198,15 @@ mounted: } static int +autofs_vget_callback(struct mount *mp, void *arg, int lkflags __unused, + struct vnode **vpp) +{ + + + return (autofs_node_vn(arg, mp, vpp)); +} + +static int autofs_lookup(struct vop_lookup_args *ap) { struct vnode *dvp, *newvp, **vpp; @@ -217,24 +226,19 @@ autofs_lookup(struct vop_lookup_args *ap if (cnp->cn_flags & ISDOTDOT) { KASSERT(anp->an_parent != NULL, ("NULL parent")); /* - * Note that in this case, dvp is the child vnode, and we are - * looking up the parent vnode - exactly reverse from normal - * operation. To preserve lock order, we unlock the child - * (dvp), obtain the lock on parent (*vpp) in autofs_node_vn(), - * then relock the child. We use vhold()/vdrop() to prevent - * dvp from being freed in the meantime. + * Note that in this case, dvp is the child vnode, and we + * are looking up the parent vnode - exactly reverse from + * normal operation. Unlocking dvp requires some rather + * tricky unlock/relock dance to prevent mp from being freed; + * use vn_vget_ino_gen() which takes care of all that. */ - lock_flags = VOP_ISLOCKED(dvp); - vhold(dvp); - VOP_UNLOCK(dvp, 0); - error = autofs_node_vn(anp->an_parent, mp, vpp); + error = vn_vget_ino_gen(dvp, autofs_vget_callback, + anp->an_parent, 0, vpp); if (error != 0) { - AUTOFS_WARN("autofs_node_vn() failed with error %d", + AUTOFS_WARN("vn_vget_ino_gen() failed with error %d", error); + return (error); } - vn_lock(dvp, lock_flags | LK_RETRY); - vdrop(dvp); - return (error); }