Received: by 2002:a25:f815:0:0:0:0:0 with SMTP id u21csp3462270ybd; Fri, 28 Jun 2019 09:03:12 -0700 (PDT) X-Google-Smtp-Source: APXvYqyf/o60HZbu4JsYn4liWjAYguAWiRQ+oNXUNZLj+RDrFgDKyUu30vXgedOkayvkj+SzehB7 X-Received: by 2002:a17:902:ac86:: with SMTP id h6mr11656236plr.98.1561737792054; Fri, 28 Jun 2019 09:03:12 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1561737792; cv=none; d=google.com; s=arc-20160816; b=a6ZXx3ySSCsXyZo3AV5KoEiZP7Q3EzWcOtm/Q21U2A5ODafCxqEY0TBOTMCyzkjBkN kC5v+SKXm238+5yPXpkZT5fLmCfkofe/fzuJWJgSsqTTcDNZctWo9O+H9KrP4gjgEoVR H0MiCcWnkYuYiYm/0tlVJc9N7ZslClbsTwIdxdd8o7asYTx2r4PzwRxZNpDOzIjbsVjB 1oHyPKD9cBxlChWhhw94gpCu66lXVG+140wIOhoJnu8IlaV7RQCcnmWHZLQkgFhlQQD3 JKIi1gk3t7yItqM/9EVMtIZ/YofkOPu3qFG+sVG0dL7UXS6kdGPxFmXo6csbjcihmGAG tS1A== 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:dkim-signature; bh=GyhiC5rh5R/SA3JdFPBdp/fqKIvCDnAaiwOHr5+37xI=; b=SsGfwQ5uyxwkCpQLfLe//BwzKYA5PkfaKeENxdMpJ9pzb1pO9AIJc1HznpWeJ6i+37 yOOIiJZ0iqK2lJpNvcS40nmjIpyTK1TJxU40KAPgFFbYsBvCGBWM67AigFHDfTXWmLrQ 3mXxVi36I15jjDDt20NIkDKGw7oLY6IkU5rS5SK1eKpLNywEL16gHybIqvJ2R/mru8SX sYvN+cAKJAd05FFv6jp6CxoOz9fo6j7g2YS/aYyYD0rX0U2QsRloGSLhD3j8S5/QfS2O RPjs/+BOUDCmuDz4Y2CElEkO+zLHs+xK+bvjs2OGqwvWmcJw2N6NDAFQWB+61u89V/IJ URfA== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=sJFGMpBO; 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 l1si2316365pgi.25.2019.06.28.09.02.51; Fri, 28 Jun 2019 09:03:12 -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; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=sJFGMpBO; 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 S1726909AbfF1QCc (ORCPT + 99 others); Fri, 28 Jun 2019 12:02:32 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:37522 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726863AbfF1QCc (ORCPT ); Fri, 28 Jun 2019 12:02:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.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:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=GyhiC5rh5R/SA3JdFPBdp/fqKIvCDnAaiwOHr5+37xI=; b=sJFGMpBOwecab1Pbl4HEXHNu2 /wBUXjIy6p22D3vgPvvlNhozFXM+KVKACnPL2NbJPVrAZFuKp+3HDfOYnL1Mc7LHP8DLAzdTCKL/M jtQ4Y3JO+eMQlOMEbamh/I0lbFBEmJ/iyZ9EL953YZEt+lcnut1AuQAOJt6eyq3Y4XJvw/K/hS0f2 6B7ffZYBcXBu2DeKaHMcFjnO0S5AVIUHx5MiNwuUgl2xWqOhrvhifabag26uh6oHjTBDee+1w7g9a 70GpxMVxu0L9Q8NCfgXV5BtLdzrFawxxAHWGZdac3NONSLG0sPJ4Y1oZWTuR2A96BAs07erkqYY/P oibYd4g9w==; Received: from hch by bombadil.infradead.org with local (Exim 4.92 #3 (Red Hat Linux)) id 1hgtKY-0006oo-Om; Fri, 28 Jun 2019 16:02:30 +0000 Date: Fri, 28 Jun 2019 09:02:30 -0700 From: Christoph Hellwig To: OGAWA Hirofumi Cc: Christoph Hellwig , Andrew Morton , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH] fat: Add nobarrier to workaround the strange behavior of device Message-ID: <20190628160230.GA24232@infradead.org> References: <871rzdrdxw.fsf@mail.parknet.co.jp> <20190628143216.GA538@infradead.org> <87pnmxpx9p.fsf@mail.parknet.co.jp> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87pnmxpx9p.fsf@mail.parknet.co.jp> User-Agent: Mutt/1.11.4 (2019-03-13) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Jun 29, 2019 at 12:03:46AM +0900, OGAWA Hirofumi wrote: > I see, sounds like good though. Does it work for all stable versions? > Can it disable only flush command without other effect? And it would be > better to be normal user controllable easily. The option was added in 2.6.17, so it's been around forever. But no, it obviously is not user exposed as using it on a normal drive can lead to data loss.