From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2BE5CC433E1 for ; Wed, 8 Jul 2020 15:42:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F2E0F20720 for ; Wed, 8 Jul 2020 15:42:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594222948; bh=Omz0Ovx6CsN5da7ebApUbvfEwPd65fRIoSDN7S/hJeI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=cU1eLv4yCZndpMrSh0BbY1owEJqscig07OJY0aXTpWLqrVOtD2XBpDjl/OGx4SfUD 8k+leLNC0GnQdCHRXQy8iXc4nM1bI/KkN9XmbzgUHN9kXX4Qwm/wyOUWUBOBY2MRox 5hTM1YdAA/3FWUp5Ts1GiO2UkuvV+u5x1sRfUyLE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730720AbgGHPmX (ORCPT ); Wed, 8 Jul 2020 11:42:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:49642 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730364AbgGHPmO (ORCPT ); Wed, 8 Jul 2020 11:42:14 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 92C86206DF; Wed, 8 Jul 2020 15:42:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594222934; bh=Omz0Ovx6CsN5da7ebApUbvfEwPd65fRIoSDN7S/hJeI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OD1adXrRzcH9GeDKa+5FEJRy7Ok7IPaPqz2qTlPSmlQ4n8NhINs6tGIkMs5p1vmA5 vi0bSbHMWlQTs/vAGaZBtmCzLgOZZgf8gTmNWu8Zq5BYw3/zP++U4G/REJ6Wy/Hvuk 7eVIWrmFHAtzW0NZR6M+C76qXEjH2zVSIOv+Ptbo= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Bob Peterson , Sasha Levin , cluster-devel@redhat.com Subject: [PATCH AUTOSEL 4.14 4/5] gfs2: read-only mounts should grab the sd_freeze_gl glock Date: Wed, 8 Jul 2020 11:42:07 -0400 Message-Id: <20200708154208.3200232-4-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200708154208.3200232-1-sashal@kernel.org> References: <20200708154208.3200232-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bob Peterson [ Upstream commit b780cc615ba4795a7ef0e93b19424828a5ad456a ] Before this patch, only read-write mounts would grab the freeze glock in read-only mode, as part of gfs2_make_fs_rw. So the freeze glock was never initialized. That meant requests to freeze, which request the glock in EX, were granted without any state transition. That meant you could mount a gfs2 file system, which is currently frozen on a different cluster node, in read-only mode. This patch makes read-only mounts lock the freeze glock in SH mode, which will block for file systems that are frozen on another node. Signed-off-by: Bob Peterson Signed-off-by: Sasha Levin --- fs/gfs2/ops_fstype.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c index 7ed0359ebac61..2de67588ac2d8 100644 --- a/fs/gfs2/ops_fstype.c +++ b/fs/gfs2/ops_fstype.c @@ -1179,7 +1179,17 @@ static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent goto fail_per_node; } - if (!sb_rdonly(sb)) { + if (sb_rdonly(sb)) { + struct gfs2_holder freeze_gh; + + error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, + GL_EXACT, &freeze_gh); + if (error) { + fs_err(sdp, "can't make FS RO: %d\n", error); + goto fail_per_node; + } + gfs2_glock_dq_uninit(&freeze_gh); + } else { error = gfs2_make_fs_rw(sdp); if (error) { fs_err(sdp, "can't make FS RW: %d\n", error); -- 2.25.1