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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 96FBEC6FA8F for ; Wed, 30 Aug 2023 03:57:48 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=linux.org.uk header.i=@linux.org.uk header.a=rsa-sha256 header.s=zeniv-20220401 header.b=C+B8K/E0; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Rb9Vf72g0z2y1Y for ; Wed, 30 Aug 2023 13:57:46 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=linux.org.uk header.i=@linux.org.uk header.a=rsa-sha256 header.s=zeniv-20220401 header.b=C+B8K/E0; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=ftp.linux.org.uk (client-ip=2a03:a000:7:0:5054:ff:fe1c:15ff; helo=zeniv.linux.org.uk; envelope-from=viro@ftp.linux.org.uk; receiver=lists.ozlabs.org) Received: from zeniv.linux.org.uk (zeniv.linux.org.uk [IPv6:2a03:a000:7:0:5054:ff:fe1c:15ff]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Rb4lL0WBBz2yKy; Wed, 30 Aug 2023 10:23:25 +1000 (AEST) 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 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> X-Mailman-Approved-At: Wed, 30 Aug 2023 13:57:00 +1000 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lucho@ionkov.net, rafael@kernel.org, djwong@kernel.org, al@alarsen.net, cmllamas@google.com, andrii@kernel.org, hughd@google.com, john.johansen@canonical.com, agordeev@linux.ibm.com, hch@lst.de, hubcap@omnibond.com, pc@manguebit.com, linux-xfs@vger.kernel.org, bvanassche@acm.org, jeffxu@chromium.org, john@keeping.me.uk, yi.zhang@huawei.com, jmorris@namei.org, code@tyhicks.com, stern@rowland.harvard.edu, borntraeger@linux.ibm.com, devel@lists.orangefs.org, mirimmad17@gmail.com, sprasad@microsoft.com, jaharkes@cs.cmu.edu, linux-um@lists.infradead.org, npiggin@gmail.com, jlbec@evilplan.org, ericvh@kernel.org, surenb@google.com, trond.myklebust@hammerspace.com, anton@tuxera.com, brauner@kernel.org, wsa+renesas@sang-engineering.com, gregkh@linuxfoundation.org, stephen.smalley.work@gmail.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, lsahlber@redhat.com, senozhatsky@chromium.org, arve@android.com, chuck.lever@oracle.com, svens@linux.ibm.com, jolsa@kernel.org, jack@suse.c om, tj@kernel.org, akpm@linux-foundation.org, linux-trace-kernel@vger.kernel.org, xu.xin16@zte.com.cn, shaggy@kernel.org, dhavale@google.com, penguin-kernel@i-love.sakura.ne.jp, zohar@linux.ibm.com, linux-mm@kvack.org, joel@joelfernandes.org, edumazet@google.com, sdf@google.com, jomajm@gmail.com, linux-s390@vger.kernel.org, linux-nilfs@vger.kernel.org, paul@paul-moore.com, leon@kernel.org, john.fastabend@gmail.com, mcgrof@kernel.org, chi.minghao@zte.com.cn, codalist@coda.cs.cmu.edu, selinux@vger.kernel.org, zhangpeng362@huawei.com, quic_ugoswami@quicinc.com, yhs@fb.com, yzaikin@google.com, linkinjeon@kernel.org, mhiramat@kernel.org, ecryptfs@vger.kernel.org, tkjos@android.com, madkar@cs.stonybrook.edu, gor@linux.ibm.com, yuzhe@nfschina.com, linuxppc-dev@lists.ozlabs.org, reiserfs-devel@vger.kernel.org, miklos@szeredi.hu, huyue2@coolpad.com, jaegeuk@kernel.org, gargaditya08@live.com, maco@android.com, hirofumi@mail.parknet.co.jp, haoluo@google.com, tony.luck@intel.com, tytso@mit.edu, nico@fluxnic.net, linux-ntfs-dev@lists.sourceforge.net, muchun.song@linux.dev, roberto.sassu@huawei.com, linux-f2fs-devel@lists.sourceforge.net, yang.yang29@zte.com.cn, gpiccoli@igalia.com, ebiederm@xmission.com, anna@kernel.org, quic_uaggarwa@quicinc.com, bwarrum@linux.ibm.com, mike.kravetz@oracle.com, jingyuwang_vip@163.com, linux-efi@vger.kernel.org, error27@gmail.com, martin@omnibond.com, trix@redhat.com, ocfs2-devel@lists.linux.dev, ast@kernel.org, sebastian.reichel@collabora.com, clm@fb.com, linux-mtd@lists.infradead.org, willy@infradead.org, marc.dionne@auristor.com, linux-afs@lists.infradead.org, raven@themaw.net, naohiro.aota@wdc.com, daniel@iogearbox.net, dennis.dalessandro@cornelisnetworks.com, linux-rdma@vger.kernel.org, quic_linyyuan@quicinc.com, coda@cs.cmu.edu, slava@dubeyko.com, idryomov@gmail.com, pabeni@redhat.com, adobriyan@gmail.com, serge@hallyn.com, chengzhihao1@huawei.com, axboe@kernel.dk, amir73il@gmail.com, linuszeng@tencent.com, keescook@chromium.org, arnd @arndb.de, autofs@vger.kernel.org, rostedt@goodmis.org, yifeliu@cs.stonybrook.edu, dlemoal@kernel.org, eparis@parisplace.org, ceph-devel@vger.kernel.org, xiang@kernel.org, yijiangshan@kylinos.cn, dhowells@redhat.com, linux-nfs@vger.kernel.org, linux-ext4@vger.kernel.org, kolga@netapp.com, song@kernel.org, samba-technical@lists.samba.org, sfrench@samba.org, jk@ozlabs.org, netdev@vger.kernel.org, rpeterso@redhat.com, linux-fsdevel@vger.kernel.org, bpf@vger.kernel.org, ntfs3@lists.linux.dev, linux-erofs@lists.ozlabs.org, davem@davemloft.net, jfs-discussion@lists.sourceforge.net, princekumarmaurya06@gmail.com, ebiggers@google.com, neilb@suse.de, asmadeus@codewreck.org, linux_oss@crudebyte.com, me@bobcopeland.com, kpsingh@kernel.org, okanatov@gmail.com, almaz.alexandrovich@paragon-software.com, joseph.qi@linux.alibaba.com, hayama@lineo.co.jp, adilger.kernel@dilger.ca, mikulas@artax.karlin.mff.cuni.cz, shaozhengchao@huawei.com, chenzhongjin@huawei.com, ardb@kernel.org, anton.ivanov@cambri dgegreys.com, agruenba@redhat.com, richard@nod.at, mark@fasheh.com, shr@devkernel.io, Dai.Ngo@oracle.com, cluster-devel@redhat.com, jgg@ziepe.ca, kuba@kernel.org, riel@surriel.com, salah.triki@gmail.com, dushistov@mail.ru, linux-cifs@vger.kernel.org, hca@linux.ibm.com, chao@kernel.org, apparmor@lists.ubuntu.com, josef@toxicpanda.com, Liam.Howlett@oracle.com, tom@talpey.com, hdegoede@redhat.com, linux-hardening@vger.kernel.org, aivazian.tigran@gmail.com, dchinner@redhat.com, dsterba@suse.com, xiubli@redhat.com, konishi.ryusuke@gmail.com, jgross@suse.com, jth@kernel.org, rituagar@linux.ibm.com, luisbg@kernel.org, martin.lau@linux.dev, v9fs@lists.linux.dev, fmdefrancesco@gmail.com, linux-unionfs@vger.kernel.org, lrh2000@pku.edu.cn, linux-security-module@vger.kernel.org, ezk@cs.stonybrook.edu, jefflexu@linux.alibaba.com, linux@treblig.org, hannes@cmpxchg.org, phillip@squashfs.org.uk, johannes@sipsolutions.net, sj1557.seo@samsung.com, dwmw2@infradead.org, linux-karma-devel@lists.sourcefo rge.net, linux-btrfs@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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.