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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 BAA84C46464 for ; Fri, 10 Aug 2018 08:41:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 72175223EA for ; Fri, 10 Aug 2018 08:41:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 72175223EA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com 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 S1727656AbeHJLJx (ORCPT ); Fri, 10 Aug 2018 07:09:53 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:10655 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725832AbeHJLJx (ORCPT ); Fri, 10 Aug 2018 07:09:53 -0400 Received: from DGGEMS401-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 8F455265CF87; Fri, 10 Aug 2018 16:40:56 +0800 (CST) Received: from [127.0.0.1] (10.134.22.195) by DGGEMS401-HUB.china.huawei.com (10.3.19.201) with Microsoft SMTP Server id 14.3.399.0; Fri, 10 Aug 2018 16:40:55 +0800 Subject: Re: [PATCH v3] f2fs: checkpoint disabling To: Daniel Rosenberg , Jaegeuk Kim , Jonathan Corbet , CC: , , , References: <20180807234843.129387-1-drosen@google.com> From: Chao Yu Message-ID: Date: Fri, 10 Aug 2018 16:40:53 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180807234843.129387-1-drosen@google.com> Content-Type: text/plain; charset="windows-1252" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.134.22.195] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Daniel, On 2018/8/8 7:48, Daniel Rosenberg wrote: > This adds a lightweight non-persistent snapshotting scheme to f2fs. > > To use, mount with the option checkpoint=disable, and to return to > normal operation, remount with checkpoint=enable. If the filesystem > is shut down before remounting with checkpoint=enable, it will revert > back to its apparent state when it was first mounted with > checkpoint=disable. This is useful for situations where you wish to be > able to roll back the state of the disk in case of some critical > failure. When filesystem is full, statfs shown abnormally as below: /dev/zram0 2095104 -17177769548 17179864652 - /mnt/f2fs I guess it's related to this patch, could you have a look at this? Thanks,