From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6E82ECE58E for ; Tue, 15 Oct 2019 08:01:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 92EE620873 for ; Tue, 15 Oct 2019 08:01:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="L6p5C1wC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727975AbfJOIBM (ORCPT ); Tue, 15 Oct 2019 04:01:12 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:37824 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727295AbfJOIBM (ORCPT ); Tue, 15 Oct 2019 04:01:12 -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=QQ9QN/iK5ai9ajNOdo+9OkqRPuRUL2eL7TDow4sjeu4=; b=L6p5C1wC28xb4xV/ytStImi/n SV2iv4Hjrb+zQYIjHC5OIRoQt2FCR3rotBnYGdihUInJs5Y+lXexNKAZKw1XhTXXTzxcqSL5L86hZ kKgdo28rNBbi+hPf8BlLlY9trWgIHMU7EaYEgNuVg6jq/rwQBiZ3mmyUVqJHmJd7/TJG3voH/jXr+ zoR3ladcSEOvo1Z1l2E1eXyZ7+edNMBda6a9KuH0FIWk2RjvsWzNKuNbegHEMx+3j6EHdx7SwAMUH NmdlCkggWdeE6ObgGfQ8L6DYKa0sYuW7P5cGl/Snou5v4lh8+gKAe1LIaN5lLQ6IffEfoucjqR71U /kODYccaA==; Received: from hch by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1iKHlO-0002Ht-4T; Tue, 15 Oct 2019 08:01:02 +0000 Date: Tue, 15 Oct 2019 01:01:02 -0700 From: Christoph Hellwig To: Eric Sandeen Cc: Jan Kara , Pingfan Liu , "Darrick J. Wong" , Hari Bathini , linuxppc-dev@lists.ozlabs.org, Dave Chinner , Eric Sandeen , Jan Kara , linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org Subject: Re: [PATCH] xfs: introduce "metasync" api to sync metadata to fsblock Message-ID: <20191015080102.GB3055@infradead.org> References: <1570977420-3944-1-git-send-email-kernelfans@gmail.com> <20191013163417.GQ13108@magnolia> <20191014083315.GA10091@mypc> <20191014094311.GD5939@quack2.suse.cz> <20191014200303.GF5939@quack2.suse.cz> <5796090e-6206-1bd7-174e-58798c9af052@sandeen.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5796090e-6206-1bd7-174e-58798c9af052@sandeen.net> User-Agent: Mutt/1.12.1 (2019-06-15) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Mon, Oct 14, 2019 at 03:09:48PM -0500, Eric Sandeen wrote: > We're in agreement here. ;) I only worry about implementing things like this > which sound like guarantees, but aren't, and end up encouraging bad behavior > or promoting misconceptions. > > More and more, I think we should reconsider Darrick's "bootfs" (ext2 by another > name, but with extra-sync-iness) proposal... Having a separate simple file system for the boot loader makes a lot of sense. Note that vfat of EFI is the best choice, but at least it is something. SysV Unix from the 90s actually had a special file system just for that, and fs/bfs/ in Linux supports that. So this isn't really a new thing either.