From owner-freebsd-fs@FreeBSD.ORG Fri Apr 8 15:20:51 2011 Return-Path: Delivered-To: freebsd-fs@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 44EA51065670; Fri, 8 Apr 2011 15:20:51 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140]) by mx1.freebsd.org (Postfix) with ESMTP id 5E47C8FC0A; Fri, 8 Apr 2011 15:20:49 +0000 (UTC) Received: from odyssey.starpoint.kiev.ua (alpha-e.starpoint.kiev.ua [212.40.38.101]) by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id SAA07956; Fri, 08 Apr 2011 18:20:35 +0300 (EEST) (envelope-from avg@FreeBSD.org) Message-ID: <4D9F27C3.5030306@FreeBSD.org> Date: Fri, 08 Apr 2011 18:20:35 +0300 From: Andriy Gapon User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US; rv:1.9.2.15) Gecko/20110309 Lightning/1.0b2 Thunderbird/3.1.9 MIME-Version: 1.0 To: Bruce Evans References: <4D9DF375.4080506@FreeBSD.org> <20110408000025.GA16252@icarus.home.lan> <4D9EF55C.5070300@FreeBSD.org> <20110408214920.I1265@besplex.bde.org> In-Reply-To: <20110408214920.I1265@besplex.bde.org> X-Enigmail-Version: 1.1.2 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: freebsd-fs@FreeBSD.org, FreeBSD Hackers Subject: Re: retry mounting with ro when rw fails X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 08 Apr 2011 15:20:51 -0000 on 08/04/2011 15:20 Bruce Evans said the following: > But the default behaviour is backwards, especially for read-mostly > removable media. The default should be ro, possibly with an automagic > upgrade to rw iff the media really needs to be written too. Writing > timestamps for file system and inode access times doesn't count as > "really needs to be written to". > > I think I prefer requiring an explicit upgrade to rw. rw implies > writing access times unless you also use noatime, and I wouldn't want > noatime to be set automagically depending on whether rw is set explicitly, > so I would want noatime to be set explicitly, and once you do that > then you can easily set rw or ro at the same time. A new rm (read mostly) > or "rwa" (read or write automagically) flag could give automatic upgrade > from ro to rw. I'd also like automatic downgrade to ro after a file > system has not been written to for some time (this would avoid fscks > in most cases for read-mostly file systems. The ro flag should be > per-cylinder-group in ffs so that on big disks, most parts are read-only > most of the time and don't need to be checked). This is a very good idea, I would like to get that too, but it's a bit more work than the "auto"-mounting. -- Andriy Gapon