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[23.128.96.18]) by mx.google.com with ESMTP id d5si18197021ilr.23.2021.07.19.02.05.05; Mon, 19 Jul 2021 02:05:16 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=Wi22x+Sk; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235896AbhGSIXs (ORCPT + 99 others); Mon, 19 Jul 2021 04:23:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:41442 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235831AbhGSIXr (ORCPT ); Mon, 19 Jul 2021 04:23:47 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 250FE61220; Mon, 19 Jul 2021 08:54:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1626684882; bh=PNDJ3yy1GPRXY9a7Ib41rhUp0LSubtpNKhCmo000WW0=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=Wi22x+SkuOH27vAvSGfrA9zM/OPV2VsSbhqMH1RZBuH6r6mpLmE9Pt/Y4oo9Owpb8 IeQKkqM4xvS/wlUO4yxfF8XdiE+pLv/4Hricg5yMANx2Jh4ewrotwg48XdP2SvnEY8 PulIlWTHFgVWmV/Kp3whindn+ApSH6ol3ivPTKONkXr8SFAMBXugXZ6agtM/UJSGqt 28ScV9MZ9Cn7DGpYht48nQ3mEqHSVf/B3/NFW1Uf2t9PDpqIDjARamFOQhpPaReUpD 5t7o/ytjri2aLr9ojxBjlDClX6IZEedJv0QndKNlFSn9V8K98ebJDHnjerFOAGO9Wv D/qdcm+cYhg3g== Subject: Re: [f2fs-dev] [PATCH] f2fs: reset free segment to prefree status when do_checkpoint() fail To: Yangtao Li , jaegeuk@kernel.org Cc: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net References: <20210427082106.2755-1-frank.li@vivo.com> <12ae52df-bc5e-82c3-4f78-1eafe7723f93@huawei.com> From: Chao Yu Message-ID: <5f37995c-2390-e8ca-d002-3639ad39e0d3@kernel.org> Date: Mon, 19 Jul 2021 16:54:40 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <12ae52df-bc5e-82c3-4f78-1eafe7723f93@huawei.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021/4/27 20:37, Chao Yu wrote: > I think just reverting dirty/free bitmap is not enough if checkpoint fails, > due to we have updated sbi->cur_cp_pack and nat/sit bitmap, next CP tries > to overwrite last valid meta/node/data, then filesystem will be corrupted. > > So I suggest to set cp_error if do_checkpoint() fails until we can handle > all cases, which is not so easy. > > How do you think? Let's add below patch first before you figure out the patch which covers all things. From 3af957c98e9e04259f8bb93ca0b74ba164f3f27e Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Mon, 19 Jul 2021 16:37:44 +0800 Subject: [PATCH] f2fs: fix to stop filesystem update once CP failed During f2fs_write_checkpoint(), once we failed in f2fs_flush_nat_entries() or do_checkpoint(), metadata of filesystem such as prefree bitmap, nat/sit version bitmap won't be recovered, it may cause f2fs image to be inconsistent, let's just set CP error flag to avoid further updates until we figure out a scheme to rollback all metadatas in such condition. Reported-by: Yangtao Li Signed-off-by: Yangtao Li Signed-off-by: Chao Yu --- fs/f2fs/checkpoint.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index 6c208108d69c..096c85022f62 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -1639,8 +1639,10 @@ int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc) /* write cached NAT/SIT entries to NAT/SIT area */ err = f2fs_flush_nat_entries(sbi, cpc); - if (err) + if (err) { + f2fs_stop_checkpoint(sbi, false); goto stop; + } f2fs_flush_sit_entries(sbi, cpc); @@ -1648,10 +1650,12 @@ int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc) f2fs_save_inmem_curseg(sbi); err = do_checkpoint(sbi, cpc); - if (err) + if (err) { + f2fs_stop_checkpoint(sbi, false); f2fs_release_discard_addrs(sbi); - else + } else { f2fs_clear_prefree_segments(sbi, cpc); + } f2fs_restore_inmem_curseg(sbi); stop: -- 2.22.1