From owner-svn-src-all@freebsd.org Sat Mar 10 22:07:58 2018 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 78337F3805E; Sat, 10 Mar 2018 22:07:58 +0000 (UTC) (envelope-from ian@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 1F20885DDF; Sat, 10 Mar 2018 22:07:58 +0000 (UTC) (envelope-from ian@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 14CF913A82; Sat, 10 Mar 2018 22:07:58 +0000 (UTC) (envelope-from ian@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w2AM7vYa093820; Sat, 10 Mar 2018 22:07:57 GMT (envelope-from ian@FreeBSD.org) Received: (from ian@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w2AM7vKk093818; Sat, 10 Mar 2018 22:07:57 GMT (envelope-from ian@FreeBSD.org) Message-Id: <201803102207.w2AM7vKk093818@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: ian set sender to ian@FreeBSD.org using -f From: Ian Lepore Date: Sat, 10 Mar 2018 22:07:57 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r330745 - head/sys/kern X-SVN-Group: head X-SVN-Commit-Author: ian X-SVN-Commit-Paths: head/sys/kern X-SVN-Commit-Revision: 330745 X-SVN-Commit-Repository: base 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: 2.1.25 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: Sat, 10 Mar 2018 22:07:58 -0000 Author: ian Date: Sat Mar 10 22:07:57 2018 New Revision: 330745 URL: https://svnweb.freebsd.org/changeset/base/330745 Log: Make root mount timeout logic work for filesystems other than ufs. The vfs.mountroot.timeout tunable and .timeout directive in a mount.conf(5) file allow specifying a wait timeout for the device(s) hosting the root filesystem to become usable. The current mechanism for waiting for devices and detecting their availability can't be used for zfs-hosted filesystems. See the comment #20 in the PR for some expanded detail on these points. This change adds retry logic to the actual root filesystem mount. That is, insted of relying on device availability using device name lookups, it uses the kernel_mount() call itself to detect whether the filesystem can be mounted, and loops until it succeeds or the configured timeout is exceeded. These changes are based on the patch attached to the PR, but it's rewritten enough that all mistakes belong to me. PR: 208882 X-MFC after: sufficient testing, and hopefully in time for 11.1 Modified: head/sys/kern/vfs_mountroot.c Modified: head/sys/kern/vfs_mountroot.c ============================================================================== --- head/sys/kern/vfs_mountroot.c Sat Mar 10 20:46:36 2018 (r330744) +++ head/sys/kern/vfs_mountroot.c Sat Mar 10 22:07:57 2018 (r330745) @@ -714,7 +714,7 @@ parse_mount(char **conf) char *errmsg; struct mntarg *ma; char *dev, *fs, *opts, *tok; - int error; + int delay, error, timeout; error = parse_token(conf, &tok); if (error) @@ -755,15 +755,31 @@ parse_mount(char **conf) if (error != 0) goto out; - ma = NULL; - ma = mount_arg(ma, "fstype", fs, -1); - ma = mount_arg(ma, "fspath", "/", -1); - ma = mount_arg(ma, "from", dev, -1); - ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); - ma = mount_arg(ma, "ro", NULL, 0); - ma = parse_mountroot_options(ma, opts); - error = kernel_mount(ma, MNT_ROOTFS); + delay = hz / 10; + timeout = root_mount_timeout * hz; + for (;;) { + ma = NULL; + ma = mount_arg(ma, "fstype", fs, -1); + ma = mount_arg(ma, "fspath", "/", -1); + ma = mount_arg(ma, "from", dev, -1); + ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); + ma = mount_arg(ma, "ro", NULL, 0); + ma = parse_mountroot_options(ma, opts); + + error = kernel_mount(ma, MNT_ROOTFS); + if (error == 0 || timeout <= 0) + break; + + if (root_mount_timeout * hz == timeout || + (bootverbose && timeout % hz == 0)) { + printf("Mounting from %s:%s failed with error %d; " + "retrying for %d more second%s\n", fs, dev, error, + timeout / hz, (timeout / hz > 1) ? "s" : ""); + } + pause("rmretry", delay); + timeout -= delay; + } out: if (error) { printf("Mounting from %s:%s failed with error %d",