Received: by 2002:a05:6a10:f347:0:0:0:0 with SMTP id d7csp5624445pxu; Wed, 23 Dec 2020 00:57:31 -0800 (PST) X-Google-Smtp-Source: ABdhPJxAyGyYl1X64nTluqdKjrzAcSPX2U8KfqLFNwlBQWXrBWvfVb64HzmKdSyMP1ykk2PSUdmv X-Received: by 2002:a17:906:a415:: with SMTP id l21mr22983604ejz.2.1608713850826; Wed, 23 Dec 2020 00:57:30 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1608713850; cv=none; d=google.com; s=arc-20160816; b=JtgaQIPMLfGLqd2vbpl0BuiWPKdOMUXTEkHSosU8Ee2lNBSJhhs/8KHuBGywStx/S9 mpYktCljl7zgKJgT9h1/skLpXqPG3GtBAtNQyMFrG/6SiAJExIbN4tXosxpa/Oav7pyC p7SCliNkE1DvQ8FJOJIsi1ke4CwJDiDufegFW2lwy08lEES7NhVeabHf0J2/giF12wN6 /NfKKgP82+7tMHGC37AvaH5hYKUot39LJjYy3rvkuQMkqyHtNoP/a/YCF6HftHCF4YDS klPSa9fcbLoLbvtrHudyyHRWafb3QrBYCm56XJrI9ATGY0toUYVjAVgW7vMfweW6dwum 8c7g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:dkim-signature; bh=HKLhSP0AX849qe/seOGRQIG2LuIaRgQixYFEE7TpKGw=; b=B2NCvkp8CrqlSRr3zMrh1xV9Q5VYUFGv7e8NyRHQn7mtNFo8PquXYASjMjEbxPiIcz DRGhGJ4BKOw+2CmqLTzDVES4AAt5WgruSe+8FsginDX4X3dL0PdwVQd/vyr8mhzkQXjG wKhA3oBgHR+Kq533YfRkFZMfNfpjBzIctJ02Ahr8nTOHFWm6R7t6sroDv/Hxe9CLq1YB vaCDgJumdvq1UURvukhyPvRj3o+8gQwCd/TerkySvgBV2BviTFOyVBspY92CIQ6w3aNF +xY95PtzDgK3TyqJBg6wHIBjtxfKkDhhg5bzTl7YDS6IL9U5hYoZiE35CJ3rePcuFIDA BHUA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=jqhmPAN1; 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 Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id h16si11652078ejt.260.2020.12.23.00.57.08; Wed, 23 Dec 2020 00:57:30 -0800 (PST) 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=@infradead.org header.s=casper.20170209 header.b=jqhmPAN1; 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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727995AbgLWIys (ORCPT + 99 others); Wed, 23 Dec 2020 03:54:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40086 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727050AbgLWIys (ORCPT ); Wed, 23 Dec 2020 03:54:48 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A0331C0613D3 for ; Wed, 23 Dec 2020 00:54:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=HKLhSP0AX849qe/seOGRQIG2LuIaRgQixYFEE7TpKGw=; b=jqhmPAN1ReUqMHRqF0T4Vd6e0q VLXL2XDuEDFIsDLVdCkvl8aHB4ZakK2ifrR9rSbsbiymIby144YrZWxZebkuAft7UINfIY5QYzQ+o KTTe7p24Nw6A6Ao+pIWfmi0la6gxevNOWLVlaakQYSDiADhO9f6eBtwFze32YhAP7Z+AgDdOELenT psPpmWbmS2BAZyRy6+xgPeF6YLiFSXVdpuXXj70ffdvnVg2TLAgObQF4QAd9+AytZ4ODQh2ozJaJ5 9d6GyTTdodIYbOvpJSEyAO07wgmTaN9/lJkyZOify4TgG5d4/93uWynlZyP3qjhZwEWhBWeEdZUCv h1So9lkw==; Received: from hch by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1krzuD-00006T-Qs; Wed, 23 Dec 2020 08:54:01 +0000 Date: Wed, 23 Dec 2020 08:54:01 +0000 From: Christoph Hellwig To: Huang Jianan Cc: Christoph Hellwig , Gao Xiang , guoweichao@oppo.com, linux-erofs@lists.ozlabs.org, zhangshiming@oppo.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH] erofs: support direct IO for uncompressed file Message-ID: <20201223085401.GA336@infradead.org> References: <20201214140428.44944-1-huangjianan@oppo.com> <20201222142234.GB17056@infradead.org> <20201222193901.GA1892159@xiangao.remote.csb> <20201223074455.GA14729@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Dec 23, 2020 at 04:48:20PM +0800, Huang Jianan wrote: > Hi Christoph, > > The reason we use dio is because we need to deploy the patch on some early > kernel versions, and we don't pay much attention to the change of iomap. No, that is never an excuse for upstream development.