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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 D1A17C6778C for ; Sun, 1 Jul 2018 16:43:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8ECC1253E8 for ; Sun, 1 Jul 2018 16:43:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8ECC1253E8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1032356AbeGAQnZ (ORCPT ); Sun, 1 Jul 2018 12:43:25 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:37798 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1032077AbeGAQnQ (ORCPT ); Sun, 1 Jul 2018 12:43:16 -0400 Received: from localhost (LFbn-1-12247-202.w90-92.abo.wanadoo.fr [90.92.61.202]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 4085CA73; Sun, 1 Jul 2018 16:43:15 +0000 (UTC) From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Robert Elliott , Dan Williams Subject: [PATCH 4.17 145/220] linvdimm, pmem: Preserve read-only setting for pmem devices Date: Sun, 1 Jul 2018 18:22:49 +0200 Message-Id: <20180701160914.368620326@linuxfoundation.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180701160908.272447118@linuxfoundation.org> References: <20180701160908.272447118@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Robert Elliott commit 254a4cd50b9fe2291a12b8902e08e56dcc4e9b10 upstream. The pmem driver does not honor a forced read-only setting for very long: $ blockdev --setro /dev/pmem0 $ blockdev --getro /dev/pmem0 1 followed by various commands like these: $ blockdev --rereadpt /dev/pmem0 or $ mkfs.ext4 /dev/pmem0 results in this in the kernel serial log: nd_pmem namespace0.0: region0 read-write, marking pmem0 read-write with the read-only setting lost: $ blockdev --getro /dev/pmem0 0 That's from bus.c nvdimm_revalidate_disk(), which always applies the setting from nd_region (which is initially based on the ACPI NFIT NVDIMM state flags not_armed bit). In contrast, commit 20bd1d026aac ("scsi: sd: Keep disk read-only when re-reading partition") fixed this issue for SCSI devices to preserve the previous setting if it was set to read-only. This patch modifies bus.c to preserve any previous read-only setting. It also eliminates the kernel serial log print except for cases where read-write is changed to read-only, so it doesn't print read-only to read-only non-changes. Cc: Fixes: 581388209405 ("libnvdimm, nfit: handle unarmed dimms, mark namespaces read-only") Signed-off-by: Robert Elliott Signed-off-by: Dan Williams Signed-off-by: Greg Kroah-Hartman --- drivers/nvdimm/bus.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) --- a/drivers/nvdimm/bus.c +++ b/drivers/nvdimm/bus.c @@ -566,14 +566,18 @@ int nvdimm_revalidate_disk(struct gendis { struct device *dev = disk_to_dev(disk)->parent; struct nd_region *nd_region = to_nd_region(dev->parent); - const char *pol = nd_region->ro ? "only" : "write"; + int disk_ro = get_disk_ro(disk); - if (nd_region->ro == get_disk_ro(disk)) + /* + * Upgrade to read-only if the region is read-only preserve as + * read-only if the disk is already read-only. + */ + if (disk_ro || nd_region->ro == disk_ro) return 0; - dev_info(dev, "%s read-%s, marking %s read-%s\n", - dev_name(&nd_region->dev), pol, disk->disk_name, pol); - set_disk_ro(disk, nd_region->ro); + dev_info(dev, "%s read-only, marking %s read-only\n", + dev_name(&nd_region->dev), disk->disk_name); + set_disk_ro(disk, 1); return 0;