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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 103A1E728CA for ; Fri, 29 Sep 2023 15:36:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Date:Cc:To:From:Subject:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=UK6ARABbLbpfeXSTpExZQ8uuceg9oGHzIOtrBTeqgPI=; b=gGihuAvglf1uuE XAe/ZAjqCemqlJuWJj8ep5mts23fJkeLeeIyIOSpkhJGi0BBodD7njGBrjEkAr7vQcleuq3xhv2gw upuhtiWPRA7YwgIfLpJOH8HI//xz8DpsXNw7BAEG8/QVXBzulpjHFx5v7HuvKxIeH5Ia8v1yToH0Y IHVERR3wdErNSEPCfUPsThU1g1ySGUwlJl076NG/P6ukpPJS0JeNRvLJS7CkKdk37N6csdAd06AEb kX7grGVj7P5tGPdcGcLTzMr0lvEPeuC7W1EyvTRVbzNHrf+MpDwqCfBHZR4DHDKhjr8U2jpj2LZfg I973OMKl0U42fSZwGkEQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qmFXl-008Ce8-23; Fri, 29 Sep 2023 15:36:41 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qmAYd-007Wp2-1J; Fri, 29 Sep 2023 10:17:17 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by ams.source.kernel.org (Postfix) with ESMTP id 8BAA9B81E85; Fri, 29 Sep 2023 10:17:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C55EAC433C7; Fri, 29 Sep 2023 10:16:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1695982632; bh=P0eff07RhtpS5UOcz3JkNsf+Ld6yeT/W26VJM0WDCPo=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=XzS9mEvGo34Ng6IbV0phy7oFkBghevr6TXQtKuvgCZiNk6sipSIK1ybdV8fiZNmJi ryG2oocKEqZZKJ0Qpanb9xZf3XPiR4Bq6wmT9EMmf0fleXLKV9fNEg9/bkdRQXUeb0 6CCRA5VO7ZThmTCkkfWYanznw4Z3cZqE/s5mMA3tjLRXwYn9bn1bqt+qj2Mv3mg9Lj pTssK95Hwcb1T8QjlazVp2JhItPwZmMqN2Vq1pnJqTnlHDG5dK0bcBFAZ33vjsFaWl leIqxKSfZkutf2lGQF/4jFFb0IVmQg0er/lH6TmX4JwaSuIbh4XkLnYFCd3nLSRRA6 40ODyX835zJVA== Message-ID: Subject: Re: [PATCH 86/87] fs: switch timespec64 fields in inode to discrete integers From: Jeff Layton To: Christian Brauner Cc: Arnd Bergmann , Alexander Viro , Linus Torvalds , David Sterba , Amir Goldstein , Theodore Ts'o , "Eric W. Biederman" , Kees Cook , Jeremy Kerr , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Greg Kroah-Hartman , Arve =?ISO-8859-1?Q?Hj=F8nnev=E5g?= , Todd Kjos , Martijn Coenen , Joel Fernandes , Carlos Llamas , Suren Baghdasaryan , Mattia Dongili , Dennis Dalessandro , Jason Gunthorpe , Leon Romanovsky , Brad Warrum , Ritu Agarwal , Hans de Goede , Ilpo =?ISO-8859-1?Q?J=E4rvinen?= , Mark Gross , Jiri Slaby , Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , David Sterba , David Howells , Marc Dionne , Ian Kent , Luis de Bethencourt , Salah Triki , "Tigran A. Aivazian" , Chris Mason , Josef Bacik , Xiubo Li , Ilya Dryomov , Jan Harkes , coda@cs.cmu.edu, Joel Becker , Christoph Hellwig , Nicolas Pitre , "Rafael J . Wysocki" , Ard Biesheuvel , Gao Xiang , Chao Yu , Yue Hu , Jeffle Xu , Namjae Jeon , Sungjong Seo , Jan Kara , Andreas Dilger , Jaegeuk Kim , OGAWA Hirofumi , Christoph Hellwig , Miklos Szeredi , Bob Peterson , Andreas Gruenbacher , Richard Weinberger , Anton Ivanov , Johannes Berg , Mikulas Patocka , Mike Kravetz , Muchun Song , Jan Kara , David Woodhouse , Dave Kleikamp , Tejun Heo , Trond Myklebust , Anna Schumaker , Chuck Lever , Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Ryusuke Konishi , Anton Altaparmakov , Konstantin Komarov , Mark Fasheh , Joseph Qi , Bob Copeland , Mike Marshall , Martin Brandenburg , Luis Chamberlain , Iurii Zaikin , Tony Luck , "Guilherme G. Piccoli" , Anders Larsen , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Sergey Senozhatsky , Phillip Lougher , Steven Rostedt , Masami Hiramatsu , Evgeniy Dushistov , Chandan Babu R , "Darrick J. Wong" , Damien Le Moal , Naohiro Aota , Johannes Thumshirn , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Hugh Dickins , Andrew Morton , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , John Johansen , Paul Moore , James Morris , "Serge E. Hallyn" , Stephen Smalley , Eric Paris , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-rdma@vger.kernel.org, linux-serial@vger.kernel.org, linux-usb@vger.kernel.org, v9fs@lists.linux.dev, linux-afs@lists.infradead.org, autofs@vger.kernel.org, linux-btrfs@vger.kernel.org, ceph-devel@vger.kernel.org, codalist@coda.cs.cmu.edu, linux-efi@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, gfs2@lists.linux.dev, linux-um@lists.infradead.org, linux-mtd@lists.infradead.org, jfs-discussion@lists.sourceforge.net, linux-nfs@vger.kernel.org, linux-nilfs@vger.kernel.org, linux-ntfs-dev@lists.sourceforge.net, ntfs3@lists.linux.dev, ocfs2-devel@lists.linux.dev, linux-karma-devel@lists.sourceforge.net, devel@lists.orangefs.org, linux-unionfs@vger.kernel.org, linux-hardening@vger.kernel.org, reiserfs-devel@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-trace-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, bpf@vger.kernel.org, Netdev , apparmor@lists.ubuntu.com, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Date: Fri, 29 Sep 2023 06:16:57 -0400 In-Reply-To: <20230929-yuppie-unzweifelhaft-434bf13bc964@brauner> References: <20230928110554.34758-1-jlayton@kernel.org> <20230928110554.34758-2-jlayton@kernel.org> <6020d6e7-b187-4abb-bf38-dc09d8bd0f6d@app.fastmail.com> <20230929-yuppie-unzweifelhaft-434bf13bc964@brauner> User-Agent: Evolution 3.48.4 (3.48.4-1.fc38) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230929_031715_758668_74D88EF2 X-CRM114-Status: GOOD ( 20.27 ) X-Mailman-Approved-At: Fri, 29 Sep 2023 08:36:32 -0700 X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org On Fri, 2023-09-29 at 11:44 +0200, Christian Brauner wrote: > > It is a lot of churn though. > > I think that i_{a,c,m}time shouldn't be accessed directly by > filesystems same as no filesystem should really access i_{g,u}id which > we also provide i_{g,u}id_{read,write}() accessors for. The mode is > another example where really most often should use helpers because of all > the set*id stripping that we need to do (and the bugs that we had > because of this...). > > The interdependency between ctime and mtime is enough to hide this in > accessors. The other big advantage is simply grepability. So really I > would like to see this change even without the type switch. > > In other words, there's no need to lump the two changes together. Do the > conversion part and we can argue about the switch to discrete integers > separately. > > The other adavantage is that we have a cycle to see any possible > regression from the conversion. > > Thoughts anyone? That works for me, and sort of what I was planning anyway. I mostly just did the change to timestamp storage to see what it would look like afterward. FWIW, I'm planning to do a v2 patchbomb early next week, with the changes that Chuck suggested (specific helpers for fetching the _sec and _nsec fields). For now, I'll drop the change from timespec64 to discrete fields. We can do that in a separate follow-on set. -- Jeff Layton _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um