From patchwork Mon May 11 08:08:51 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 6373931 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id CA0CBBEEE1 for ; Mon, 11 May 2015 08:09:29 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E612D2035E for ; Mon, 11 May 2015 08:09:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 03076203C4 for ; Mon, 11 May 2015 08:09:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752742AbbEKIJ0 (ORCPT ); Mon, 11 May 2015 04:09:26 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:6243 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752664AbbEKIJG (ORCPT ); Mon, 11 May 2015 04:09:06 -0400 X-IronPort-AV: E=Sophos;i="5.04,848,1406563200"; d="scan'208";a="91967357" Received: from unknown (HELO edo.cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 11 May 2015 16:05:09 +0800 Received: from G08CNEXCHPEKD02.g08.fujitsu.local (localhost.localdomain [127.0.0.1]) by edo.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id t4B87i16028779 for ; Mon, 11 May 2015 16:07:44 +0800 Received: from localhost.localdomain (10.167.226.33) by G08CNEXCHPEKD02.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.181.6; Mon, 11 May 2015 16:09:07 +0800 From: Qu Wenruo To: Subject: [PATCH v2 10/13] btrfs-progs: Introduce change_id_prepare() and change_id_done() functions. Date: Mon, 11 May 2015 16:08:51 +0800 Message-ID: <1431331734-11714-11-git-send-email-quwenruo@cn.fujitsu.com> X-Mailer: git-send-email 2.4.0 In-Reply-To: <1431331734-11714-1-git-send-email-quwenruo@cn.fujitsu.com> References: <1431331734-11714-1-git-send-email-quwenruo@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.33] Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP These two functions will write flags to all supers before and after fsid/chunk tree id change, informing kernel not to mount a inconsistent fs. Signed-off-by: Qu Wenruo --- v2: Newly introduced to inform kernel and progs not to open fs with unfinished uuid change. --- props.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/props.c b/props.c index 59e09b3..0a1bc1e 100644 --- a/props.c +++ b/props.c @@ -351,6 +351,38 @@ out: return ret; } +static int change_id_prepare(struct btrfs_fs_info *fs_info) +{ + u64 flags = btrfs_super_flags(fs_info->super_copy); + + if (!fs_info->new_fsid && !fs_info->new_chunk_tree_uuid) + return 0; + + if (fs_info->new_fsid) + flags |= BTRFS_SUPER_FLAG_CHANGING_FSID; + if (fs_info->new_chunk_tree_uuid) + flags |= BTRFS_SUPER_FLAG_CHANGING_CHUNK_TREE_ID; + btrfs_set_super_flags(fs_info->super_copy, flags); + + return write_all_supers(fs_info->tree_root); +} + +static int change_id_done(struct btrfs_fs_info *fs_info) +{ + u64 flags = btrfs_super_flags(fs_info->super_copy); + + if (!fs_info->new_fsid && !fs_info->new_chunk_tree_uuid) + return 0; + + if (fs_info->new_fsid) + flags &= ~BTRFS_SUPER_FLAG_CHANGING_FSID; + if (fs_info->new_chunk_tree_uuid) + flags &= ~BTRFS_SUPER_FLAG_CHANGING_CHUNK_TREE_ID; + btrfs_set_super_flags(fs_info->super_copy, flags); + + return write_all_supers(fs_info->tree_root); +} + const struct prop_handler prop_handlers[] = { {"ro", "Set/get read-only flag of subvolume.", 0, prop_object_subvol, prop_read_only},