Received: by 2002:a25:8b12:0:0:0:0:0 with SMTP id i18csp1164824ybl; Thu, 22 Aug 2019 10:14:59 -0700 (PDT) X-Google-Smtp-Source: APXvYqz0VuWB4b30BzqwMlJhfOHKLolUIuVkwqcfqeEb4PoojSF7phO7Lrj6J2sy9YJ+cYMPRP2x X-Received: by 2002:a17:902:9b8f:: with SMTP id y15mr40335676plp.194.1566494099883; Thu, 22 Aug 2019 10:14:59 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1566494099; cv=none; d=google.com; s=arc-20160816; b=qdFXF00Qx5oo4Etr5Jr+nPGVBSJQZzAvoD4Q4S0xKZ5Rb/3CbQcbm9BArKMVHYnsp5 QsTCUy6ZbfZbuKrBOguim/5kiQsXoAYgF2L04DQHSJBedSc3Vx+xAxNgvvdXp3nnQhev iQA9dHK9ypSisbJNWnarqz/teuuqWha58BJbssBmTi6iPksBg6wTnxys37AczH/DSsyX v7bxfwMDyOW6oH45FYLj2LDKJ1O94+ds6fUwo6XtTTIquFqCX8LmMyw8StjIsVJ+M+1o gfAtjd2G0PWV7U6TfpjWQg3HER3jiw+p8/gB8a+SP5vAVjuHeqLEdXijOH10z9jNR/kA Bw7A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date; bh=ko4OZieW12pF9jBbh+LcVnY78CVHjhu2K33NybXP47c=; b=qQAU/c08ouAR9kzzU3Ylj5obPGHte55pEMJ42FHwLapbZyFS7/4N5lmuhL3b7wDABJ 0fsIafhe9IxBY0zJ7h2EP/6OAdUqeqMaBAbD/ukKB1AEgOv80RRflALHAR5LGBY6Qmnb dMHUIJR1qGUnKEsWpjcpqZEtJ/mNrQtLaWjQeAEkDnnO2jETUqeq0vNj7Ql+/6nGrFIU htoCFIS6kW+Mghbdivm9s44Ed6amyvFE4YxpS1zAkjVOBbZTcTsbGF7o4/VK6BIQ47SU VttnsHvswISK3N/C2J3DPRWyECk/TQP69XVrZfHZzoZizHqcJFIqtM/797XhHfT+xlhX Tagw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id b74si149071pfb.281.2019.08.22.10.14.45; Thu, 22 Aug 2019 10:14:59 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388474AbfHVOj0 (ORCPT + 99 others); Thu, 22 Aug 2019 10:39:26 -0400 Received: from szxga01-in.huawei.com ([45.249.212.187]:3948 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1731487AbfHVOj0 (ORCPT ); Thu, 22 Aug 2019 10:39:26 -0400 Received: from DGGEMM403-HUB.china.huawei.com (unknown [172.30.72.56]) by Forcepoint Email with ESMTP id 04F91F4E5300D576654F; Thu, 22 Aug 2019 22:39:23 +0800 (CST) Received: from dggeme762-chm.china.huawei.com (10.3.19.108) by DGGEMM403-HUB.china.huawei.com (10.3.20.211) with Microsoft SMTP Server (TLS) id 14.3.439.0; Thu, 22 Aug 2019 22:39:22 +0800 Received: from architecture4 (10.140.130.215) by dggeme762-chm.china.huawei.com (10.3.19.108) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1591.10; Thu, 22 Aug 2019 22:39:22 +0800 Date: Thu, 22 Aug 2019 22:38:42 +0800 From: Gao Xiang To: Richard Weinberger CC: "Theodore Y. Ts'o" , Gao Xiang , "Richard Weinberger" , linux-fsdevel , , linux-kernel Subject: Re: erofs: Question on unused fields in on-disk structs Message-ID: <20190822143841.GC195034@architecture4> References: <1323459733.69859.1566234633793.JavaMail.zimbra@nod.at> <20190819204504.GB10075@hsiangkao-HP-ZHAN-66-Pro-G1> <20190821220251.GA3954@hsiangkao-HP-ZHAN-66-Pro-G1> <20190822142142.GB2730@mit.edu> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-Originating-IP: [10.140.130.215] X-ClientProxiedBy: dggeme709-chm.china.huawei.com (10.1.199.105) To dggeme762-chm.china.huawei.com (10.3.19.108) X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Richard, On Thu, Aug 22, 2019 at 04:29:44PM +0200, Richard Weinberger wrote: > On Thu, Aug 22, 2019 at 4:21 PM Theodore Y. Ts'o wrote: > > It might make life easier for other kernel developers if "features" > > was named "compat_features" and "requirements" were named > > "incompat_features", just because of the long-standing use of that in > > ext2, ext3, ext4, ocfs2, etc. But that naming scheme really is a > > legacy of ext2 and its descendents, and there's no real reason why it > > has to be that way on other file systems. > > Yes, the naming confused me a little. :-) Sorry for confusing... And thanks, I'm happy that you give us those reports. and sorry about my poor English... Thanks, Gao Xiang > > -- > Thanks, > //richard