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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 6851FC2BA1A for ; Tue, 7 Apr 2020 02:16:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 41FD5206C0 for ; Tue, 7 Apr 2020 02:16:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726619AbgDGCQl (ORCPT ); Mon, 6 Apr 2020 22:16:41 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:12682 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726287AbgDGCQk (ORCPT ); Mon, 6 Apr 2020 22:16:40 -0400 Received: from DGGEMS413-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 4A90F7B786DD6BC6961; Tue, 7 Apr 2020 10:16:34 +0800 (CST) Received: from [10.134.22.195] (10.134.22.195) by smtp.huawei.com (10.3.19.213) with Microsoft SMTP Server (TLS) id 14.3.487.0; Tue, 7 Apr 2020 10:16:24 +0800 Subject: Re: [f2fs-dev] [PATCH] f2fs: introduce sysfs/data_io_flag to attach REQ_META/FUA To: Jaegeuk Kim , , , References: <20200403161249.68385-1-jaegeuk@kernel.org> From: Chao Yu Message-ID: <0e627c29-7fb0-5bd6-c1d9-b96a94df62ae@huawei.com> Date: Tue, 7 Apr 2020 10:16:22 +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: <20200403161249.68385-1-jaegeuk@kernel.org> 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 On 2020/4/4 0:12, Jaegeuk Kim wrote: > This patch introduces a way to attach REQ_META/FUA explicitly > to all the data writes given temperature. > > -> attach REQ_FUA to Hot Data writes > > -> attach REQ_FUA to Hot|Warm Data writes > > -> attach REQ_FUA to Hot|Warm|Cold Data writes > > -> attach REQ_FUA to Hot|Warm|Cold Data writes as well as > REQ_META to Hot Data writes Out of curiosity, what scenario it is used for? Thanks,