Received: by 2002:a05:7412:cfc7:b0:fc:a2b0:25d7 with SMTP id by7csp2608426rdb; Wed, 21 Feb 2024 13:12:03 -0800 (PST) X-Forwarded-Encrypted: i=3; AJvYcCUnCZfMhEn4FbQXlRSgMe1ee/NJPhwI7yREzUVDicKV2lJvSS1I+zoKjVze0MGGvkfQgWkfPf4uNbAoTn1HGg8STTRnkvdcTnMR4mvRGA== X-Google-Smtp-Source: AGHT+IEQeKFOzy2VBNk1X5papsfvLu2Uqrzbfq6FyRyRKER7BXuYG+8zm+vFbtEdBZRkwdwJajOl X-Received: by 2002:a05:6870:d8d1:b0:21e:5733:f6fa with SMTP id of17-20020a056870d8d100b0021e5733f6famr18310817oac.54.1708549922774; Wed, 21 Feb 2024 13:12:02 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1708549922; cv=pass; d=google.com; s=arc-20160816; b=BTA9wIiEYohJenLCpT7Xo8AKLeTLNhHulS3PJdj+8thSD13n4X24BUMxPo81vZ2TZQ TpLiWMTLVshKNW4uW1T7+/j1bI68A849gCyt3hsrxSwfhr1PAQgKAiuIxwsdmQEJTGqD ffrAg2APeQxVuLCON5F0EVOtTOf7/519oO025SqbIzZcBree7URfMbhhT9ziUNQsxvUP HaW14WMdSIZgCwcUPclu3iiF5prDZLW51bKHecDeMVKBvhLyPdpysW4ceCtpdA3ogdyb n84ueTP89LuYd02NGs2GZoAGv84amU4avAPGvoTQZoverei6yg4KUq81FXdTTn+UTUUq J9Pg== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=in-reply-to:content-disposition:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:references:message-id:subject:cc :to:from:date:dkim-signature; bh=4IF/TDEtjz8qAqYX7SwNgWqDwz8pWojSp1bTx/j4EbU=; fh=esM7g2RWjoel1m7aacxwE0uK8lUYaaYpqRk4o7VqjLA=; b=0DqKEGicRqsG+I4t4G3CctVVQuvwbDmzC7VVe/0/HaPR7y9AHn6duMElXujwl0o0fD nA/Zc04JkaJVyPcDHkdn27azZ/ZcjhTvsX/e1GcP5TMAPMSo6Xv8gROwQ8EfN6FhuZx8 UnGGNcIL2B9gkVPCsJTW7PfI5AKlssEpK6Y5kxnAjt40/V0Kwl6cs9o1q+VxvMJAJ0Nb PyefMI4Ey7dSdTZ+4QZOJzMeZG1G7f1ksT1HAnaeQSb9v+W4HoHaKgd6KjUI4c/szj5u 9rgwGTLrTBv6RZl9RnKIPoVH0fUvZoBH1FO0ClmSTr/lbqQllY0wuN7XS2vCUtAr4/S4 gIRQ==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@mit.edu header.s=outgoing header.b=jZB4DMWP; arc=pass (i=1 spf=pass spfdomain=mit.edu dkim=pass dkdomain=mit.edu dmarc=pass fromdomain=mit.edu); spf=pass (google.com: domain of linux-ext4+bounces-1353-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) smtp.mailfrom="linux-ext4+bounces-1353-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=mit.edu Return-Path: Received: from ny.mirrors.kernel.org (ny.mirrors.kernel.org. [147.75.199.223]) by mx.google.com with ESMTPS id x4-20020a05620a0b4400b007873da4ab7bsi11123087qkg.630.2024.02.21.13.12.02 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Feb 2024 13:12:02 -0800 (PST) Received-SPF: pass (google.com: domain of linux-ext4+bounces-1353-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223; Authentication-Results: mx.google.com; dkim=pass header.i=@mit.edu header.s=outgoing header.b=jZB4DMWP; arc=pass (i=1 spf=pass spfdomain=mit.edu dkim=pass dkdomain=mit.edu dmarc=pass fromdomain=mit.edu); spf=pass (google.com: domain of linux-ext4+bounces-1353-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) smtp.mailfrom="linux-ext4+bounces-1353-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=mit.edu Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ny.mirrors.kernel.org (Postfix) with ESMTPS id 7CC561C211F4 for ; Wed, 21 Feb 2024 21:12:02 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 17B041272DE; Wed, 21 Feb 2024 21:11:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mit.edu header.i=@mit.edu header.b="jZB4DMWP" X-Original-To: linux-ext4@vger.kernel.org Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B08F2126F37 for ; Wed, 21 Feb 2024 21:11:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=18.9.28.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708549906; cv=none; b=P4/hisnKZhWO1W2VimcHgfGVuCeszJGS4zJUFFGmJEGSwQotKzE8pZwjq4qevONODlhmWC2pmyk/KenaKXVBy1SsvzwNU4KqaNIaDuT08Nsvgyj8r5Gfkjvj5p3443YPo5gdNI+X+fkmTlM19EuIsLmCMKCl+RMjrs0qa23BhME= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708549906; c=relaxed/simple; bh=rAu5hXr+IvzK37PAMawmi9KH/zsDUxlgco15ekjwJT8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ircfz+WGWYz8OZc3PFeH+JUbRQJDEgXnPu3SDTW52j9UEtYVvHrqNCK6FdBSX7rspcRx0t4ZbW9OGicM3KDpFb5nLKezIzTqDjFRWFwVxn8Trxy3pl0KzCGrR3iHRQCqoxDSGy6H/MWHdCx5AQQM4J86A6yjcm0ezUTqcxWJOTM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mit.edu; spf=pass smtp.mailfrom=mit.edu; dkim=pass (2048-bit key) header.d=mit.edu header.i=@mit.edu header.b=jZB4DMWP; arc=none smtp.client-ip=18.9.28.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mit.edu Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mit.edu Received: from cwcc.thunk.org (pool-173-48-102-198.bstnma.fios.verizon.net [173.48.102.198]) (authenticated bits=0) (User authenticated as tytso@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id 41LLBaOf020463 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 21 Feb 2024 16:11:38 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mit.edu; s=outgoing; t=1708549898; bh=4IF/TDEtjz8qAqYX7SwNgWqDwz8pWojSp1bTx/j4EbU=; h=Date:From:Subject:Message-ID:MIME-Version:Content-Type; b=jZB4DMWP69jlCM/e4U4e7+qKnmkgA2EEM3Oa4BDGQLneJA1CdPBxHPIxA9nNELB8p g1Hae55HBsj2v0/ckDnBLI0BYrPN2kD6wk+8x9IX3ol8QdTrv5gHfM5YXNVee5x7eg y3LdPlEmBpjyx8rYqokHVfOmnqjGO6ZYsWihBRppN+5Fkoz2O0iawxmCFQKybb267i XAFAeyPrAc4D6ZjD9txeE5ZUngBf3JFrCjdNTJSnu/82uAT36SXXjg76S6CaWQLCD0 z3ppkcppVm/8GOuMO71XQVxpRPz4VV60lgT8Cq+FhqByakMeqE1zURrPQHli4bfnUO ebuU0QXoqYICQ== Received: by cwcc.thunk.org (Postfix, from userid 15806) id 4F59215C0336; Wed, 21 Feb 2024 16:11:36 -0500 (EST) Date: Wed, 21 Feb 2024 16:11:36 -0500 From: "Theodore Ts'o" To: Jan Kara Cc: Michael Opdenacker , linux-ext4@vger.kernel.org Subject: Re: Why isn't ext2 deprecated over ext4? Message-ID: <20240221211136.GA633176@mit.edu> References: <20240221110043.mj4v25a2mtmo54bw@quack3> <192cb320-2ded-4761-b0c9-3e273931f6f6@bootlin.com> <20240221165805.plnkvymjzqts2l6r@quack3> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240221165805.plnkvymjzqts2l6r@quack3> On Wed, Feb 21, 2024 at 05:58:05PM +0100, Jan Kara wrote: > Hum, so I didn't quite think through my comment about on disk format :). > When you create filesystem with larger inodes, mke2fs will indeed create > inodes with extra timestamp fields etc. ext4 driver will recognize them > and use them, however ext2 driver happily ignores them (I thought we refuse > to mount such filesystem but we don't because of the way how large inodes > were defined in the ondisk format). Well, if we *cared* we could backport the support for the expanded timestamps to ext2. I'm not sure it's worth the effort, but it's not that hard.... - Ted