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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6DB5CC83F24 for ; Wed, 30 Aug 2023 00:24:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241416AbjH3AXm (ORCPT ); Tue, 29 Aug 2023 20:23:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239507AbjH3AX0 (ORCPT ); Tue, 29 Aug 2023 20:23:26 -0400 Received: from zeniv.linux.org.uk (zeniv.linux.org.uk [IPv6:2a03:a000:7:0:5054:ff:fe1c:15ff]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 496C7EA; Tue, 29 Aug 2023 17:23:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=linux.org.uk; s=zeniv-20220401; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=zZxZUyqerb7julFXQ03Jti/01WDk420m8vSi4C3S7Zg=; b=C+B8K/E0jwmlP3x0ynEg/wW0oT 8W+g7CEhf7EdCVJx+aCWMaLZ8rDm21ORLwQNEzBBlnKI8nSnQEIfBUqrKOBnjUNllXW768GzG3qB7 +cpJ/jhntfWbFQ/3QFzCMkG1sg2st+PpzLnPrKtYydQR6EDaMR8Bc+aEbQhcPGU53TF4NXxBCLwrJ Y+Cse/dfbORxx77QJVsCQ4BCKysmxvXtFDzxb882a/rtaocFDwQw24nZDPRB3CytP/MOuWTM+mTfa +8MJ/m4rwupUEXN1Mh5oBPLgZehFHGmgz56mU9Gh95pn90zVDOFdIxrpzwqUqcKtUFnurzTC7a4a3 phr8qPBQ==; Received: from viro by zeniv.linux.org.uk with local (Exim 4.96 #2 (Red Hat Linux)) id 1qb8vV-001xXV-0L; Wed, 30 Aug 2023 00:19:17 +0000 Date: Wed, 30 Aug 2023 01:19:17 +0100 From: Al Viro To: Jeff Layton Cc: jk@ozlabs.org, arnd@arndb.de, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, gregkh@linuxfoundation.org, arve@android.com, tkjos@android.com, maco@android.com, joel@joelfernandes.org, brauner@kernel.org, cmllamas@google.com, surenb@google.com, dennis.dalessandro@cornelisnetworks.com, jgg@ziepe.ca, leon@kernel.org, bwarrum@linux.ibm.com, rituagar@linux.ibm.com, ericvh@kernel.org, lucho@ionkov.net, asmadeus@codewreck.org, linux_oss@crudebyte.com, dsterba@suse.com, dhowells@redhat.com, marc.dionne@auristor.com, raven@themaw.net, luisbg@kernel.org, salah.triki@gmail.com, aivazian.tigran@gmail.com, ebiederm@xmission.com, keescook@chromium.org, clm@fb.com, josef@toxicpanda.com, xiubli@redhat.com, idryomov@gmail.com, jaharkes@cs.cmu.edu, coda@cs.cmu.edu, jlbec@evilplan.org, hch@lst.de, nico@fluxnic.net, rafael@kernel.org, code@tyhicks.com, ardb@kernel.org, xiang@kernel.org, chao@kernel.org, huyue2@coolpad.com, jefflexu@linux.alibaba.com, linkinjeon@kernel.org, sj1557.seo@samsung.com, jack@suse.com, tytso@mit.edu, adilger.kernel@dilger.ca, jaegeuk@kernel.org, hirofumi@mail.parknet.co.jp, miklos@szeredi.hu, rpeterso@redhat.com, agruenba@redhat.com, richard@nod.at, anton.ivanov@cambridgegreys.com, johannes@sipsolutions.net, mikulas@artax.karlin.mff.cuni.cz, mike.kravetz@oracle.com, muchun.song@linux.dev, dwmw2@infradead.org, shaggy@kernel.org, tj@kernel.org, trond.myklebust@hammerspace.com, anna@kernel.org, chuck.lever@oracle.com, neilb@suse.de, kolga@netapp.com, Dai.Ngo@oracle.com, tom@talpey.com, konishi.ryusuke@gmail.com, anton@tuxera.com, almaz.alexandrovich@paragon-software.com, mark@fasheh.com, joseph.qi@linux.alibaba.com, me@bobcopeland.com, hubcap@omnibond.com, martin@omnibond.com, amir73il@gmail.com, mcgrof@kernel.org, yzaikin@google.com, tony.luck@intel.com, gpiccoli@igalia.com, al@alarsen.net, sfrench@samba.org, pc@manguebit.com, lsahlber@redhat.com, sprasad@microsoft.com, senozhatsky@chromium.org, phillip@squashfs.org.uk, rostedt@goodmis.org, mhiramat@kernel.org, dushistov@mail.ru, hdegoede@redhat.com, djwong@kernel.org, dlemoal@kernel.org, naohiro.aota@wdc.com, jth@kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, hughd@google.com, akpm@linux-foundation.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, john.johansen@canonical.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, stephen.smalley.work@gmail.com, eparis@parisplace.org, jgross@suse.com, stern@rowland.harvard.edu, lrh2000@pku.edu.cn, sebastian.reichel@collabora.com, wsa+renesas@sang-engineering.com, quic_ugoswami@quicinc.com, quic_linyyuan@quicinc.com, john@keeping.me.uk, error27@gmail.com, quic_uaggarwa@quicinc.com, hayama@lineo.co.jp, jomajm@gmail.com, axboe@kernel.dk, dhavale@google.com, dchinner@redhat.com, hannes@cmpxchg.org, zhangpeng362@huawei.com, slava@dubeyko.com, gargaditya08@live.com, penguin-kernel@i-love.sakura.ne.jp, yifeliu@cs.stonybrook.edu, madkar@cs.stonybrook.edu, ezk@cs.stonybrook.edu, yuzhe@nfschina.com, willy@infradead.org, okanatov@gmail.com, jeffxu@chromium.org, linux@treblig.org, mirimmad17@gmail.com, yijiangshan@kylinos.cn, yang.yang29@zte.com.cn, xu.xin16@zte.com.cn, chengzhihao1@huawei.com, shr@devkernel.io, Liam.Howlett@oracle.com, adobriyan@gmail.com, chi.minghao@zte.com.cn, roberto.sassu@huawei.com, linuszeng@tencent.com, bvanassche@acm.org, zohar@linux.ibm.com, yi.zhang@huawei.com, trix@redhat.com, fmdefrancesco@gmail.com, ebiggers@google.com, princekumarmaurya06@gmail.com, chenzhongjin@huawei.com, riel@surriel.com, shaozhengchao@huawei.com, jingyuwang_vip@163.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-rdma@vger.kernel.org, linux-usb@vger.kernel.org, v9fs@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-afs@lists.infradead.org, autofs@vger.kernel.org, linux-mm@kvack.org, linux-btrfs@vger.kernel.org, ceph-devel@vger.kernel.org, codalist@coda.cs.cmu.edu, ecryptfs@vger.kernel.org, linux-efi@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, 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@vger.kernel.org, apparmor@lists.ubuntu.com, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Subject: Re: [PATCH v2 08/92] fs: new helper: simple_rename_timestamp Message-ID: <20230830001917.GC461907@ZenIV> References: <20230705185812.579118-1-jlayton@kernel.org> <20230705185812.579118-3-jlayton@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230705185812.579118-3-jlayton@kernel.org> Sender: Al Viro Precedence: bulk List-ID: On Wed, Jul 05, 2023 at 02:58:11PM -0400, Jeff Layton wrote: > + * POSIX mandates that the old and new parent directories have their ctime and > + * mtime updated, and that inodes of @old_dentry and @new_dentry (if any), have > + * their ctime updated. APPLICATION USAGE Some implementations mark for update the last file status change timestamp of renamed files and some do not. Applications which make use of the last file status change timestamp may behave differently with respect to renamed files unless they are designed to allow for either behavior. So for children POSIX permits rather than mandates. Doesn't really matter; Linux behaviour had been to touch ctime on children since way back, if not since the very beginning.