Received: by 2002:a25:f815:0:0:0:0:0 with SMTP id u21csp3374256ybd; Fri, 28 Jun 2019 07:33:45 -0700 (PDT) X-Google-Smtp-Source: APXvYqwBi4GTaNk/fZ6f5QQAfBHZLgof7Oj481biLfa2oaZV8si76uL10wSOwcsRQhuXAIaSx/b8 X-Received: by 2002:a63:da52:: with SMTP id l18mr9683961pgj.131.1561732425395; Fri, 28 Jun 2019 07:33:45 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1561732425; cv=none; d=google.com; s=arc-20160816; b=aGyiHWKTOqSeu301ubHIGKGoANYN20Yb34Q13vPEKBcL20ziJNpmu6h3EZf+JI4Maj V/B78vHfSHGMLaZYYHhhtHmFswuWJGkfu06nafp+rJhu90i3R7Vr04WNocHApmVp+omk EG+cT4ehaIbSEzbldKEkHG3KJgE90cItdjZD/v8kKhRBpMdrtDeMgUABwfUmXwUpkX2/ gb0T/An0EBj6g4at+abAagUT6p2s8UDBrVe1/vX4IgnV67FQ+3kscnjOj/sYrnKolSlL gsp6x5XI+6TPQuEOXCCmMCHrBr+dzqQKWwOOlNymxaYYL2dayeTVkda5BPvpx2hx1aXM B8WQ== 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=z59db2q7R3Qs4jp6ksud3JOvoxe9K7xlif6grC7p/kQ=; b=b1pXuBqsjyDbWtuYSrnJ0Du5as4ZAJACi9kuToR7L5VliRHB1L3cdmLWsQSvi41UL+ 1MRj3DddR7j+w4j+/i2/f/P7JRBaOBZ70M5MdSEr4LkXVvM0Tt0DXDL8/E21jpzXMojr IE5N59EVzh1k80q8c0rGYnueeUSoifXJmTLKUt6N49xd8QUbZOdPgM3n0VL4AkxtEqYX 6u6HTgj/TcA4cfl+WWcSMQBL3a3xjeDpdSXCSe6aQlV4U3Onq/swwSSRmnX5lAuBo1/9 LgfuaReCxw9osJyYzJ49EV47OwOIc9LFOm6IZ6bP1+HCZrUtKxFxl/OIEYXqI9clRfoy JrkQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b="lTxr/EJA"; 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 q133si2262758pgq.410.2019.06.28.07.33.29; Fri, 28 Jun 2019 07:33:45 -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="lTxr/EJA"; 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 S1726907AbfF1OcS (ORCPT + 99 others); Fri, 28 Jun 2019 10:32:18 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:44652 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726657AbfF1OcS (ORCPT ); Fri, 28 Jun 2019 10:32:18 -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=z59db2q7R3Qs4jp6ksud3JOvoxe9K7xlif6grC7p/kQ=; b=lTxr/EJA0YdHAqSEH5qzLBFLP 42jOlBpT1JbuRG1wvwBpQ1qa/LBkUgDyp0fRyqB8o7sd7EqPfyrEM0WLXHygnty5VH2cmYV4+Z92O OYS5NAee8o2LgdZkFFeLtBEtyCczqi8Fj3ouPyTEnoTX2bkEL6xOByS5DFV8wulLt5WOrzz80KPoY 1Fr240ld04fT4A1O5Cn6HNomln9tUVmVtT72MgirYml/jWFeYldqHdU4lDRP08MP1MTpPnhJRZYwI 6N/HeiuZdzewgesoTQVrYFRrSG8hpRrPB0WsPnGngrIvd9FKAaAYRV8SJCfUIywKaotBoJbImlXaQ IKQmfjCwg==; Received: from hch by bombadil.infradead.org with local (Exim 4.92 #3 (Red Hat Linux)) id 1hgrvE-0001us-LS; Fri, 28 Jun 2019 14:32:16 +0000 Date: Fri, 28 Jun 2019 07:32:16 -0700 From: Christoph Hellwig To: OGAWA Hirofumi Cc: 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: <20190628143216.GA538@infradead.org> References: <871rzdrdxw.fsf@mail.parknet.co.jp> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <871rzdrdxw.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 Fri, Jun 28, 2019 at 11:18:19PM +0900, OGAWA Hirofumi wrote: > To workaround those devices and provide flexibility, this adds > "barrier"/"nobarrier" mount options to fat driver. We have deprecated these rather misnamed options, and now instead allow tweaking the 'cache_type' attribute on the SCSI device. That being said if the device behave this buggy you should also report it to to the usb-storage and scsi maintainers so that we can add a quirk for it.