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Message-ID: <20231001050156.GA3366643@gp-workstation.iram.es> Date: Sun, 1 Oct 2023 07:01:56 +0200 From: Gabriel Paubert <paubert@...m.es> To: Steve French <smfrench@...il.com> Cc: David Howells <dhowells@...hat.com>, Latchesar Ionkov <lucho@...kov.net>, "Rafael J . Wysocki" <rafael@...nel.org>, "Darrick J. Wong" <djwong@...nel.org>, Anders Larsen <al@...rsen.net>, Carlos Llamas <cmllamas@...gle.com>, Sven Schnelle <svens@...ux.ibm.com>, Mattia Dongili <malattia@...ux.it>, Yonghong Song <yonghong.song@...ux.dev>, Alexander Gordeev <agordeev@...ux.ibm.com>, Christoph Hellwig <hch@....de>, Mike Marshall <hubcap@...ibond.com>, Paulo Alcantara <pc@...guebit.com>, Jason Gunthorpe <jgg@...pe.ca>, James Morris <jmorris@...ei.org>, Christian Borntraeger <borntraeger@...ux.ibm.com>, devel@...ts.orangefs.org, Shyam Prasad N <sprasad@...rosoft.com>, Jan Harkes <jaharkes@...cmu.edu>, linux-um@...ts.infradead.org, Nicholas Piggin <npiggin@...il.com>, Alexander Viro <viro@...iv.linux.org.uk>, Eric Van Hensbergen <ericvh@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>, Trond Myklebust <trond.myklebust@...merspace.com>, Anton Altaparmakov <anton@...era.com>, Christian Brauner <brauner@...nel.org>, Greg Kr oah-Hartman <gregkh@...uxfoundation.org>, Stephen Smalley <stephen.smalley.work@...il.com>, linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, Ronnie Sahlberg <lsahlber@...hat.com>, Sergey Senozhatsky <senozhatsky@...omium.org>, Luis Chamberlain <mcgrof@...nel.org>, Chuck Lever <chuck.lever@...cle.com>, Masami Hiramatsu <mhiramat@...nel.org>, Jiri Olsa <jolsa@...nel.org>, Jan Kara <jack@...e.com>, Tejun Heo <tj@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Dave Kleikamp <shaggy@...nel.org>, samba-technical@...ts.samba.org, Marc Dionne <marc.dionne@...istor.com>, Eric Dumazet <edumazet@...gle.com>, Stanislav Fomichev <sdf@...gle.com>, linux-s390@...r.kernel.org, linux-nilfs@...r.kernel.org, Paul Moore <paul@...l-moore.com>, Leon Romanovsky <leon@...nel.org>, Hugh Dickins <hughd@...gle.com>, Andrii Nakryiko <andrii@...nel.org>, codalist@...a.cs.cmu.edu, Iurii Zaikin <yzaikin@...gle.com>, Namjae Jeon <linkinjeon@...nel.org>, linux-trace-kernel@...r.kernel.org, Todd Kjos <tkjos@...roid.com>, Vasily Gorbik <gor@...ux.ibm.com>, selinux@...r.kernel.org, reiserfs-devel@...r.kernel.org, Sungjong Seo <sj1557.seo@...sung.com>, ocfs2-devel@...ts.linux.dev, Yue Hu <huyue2@...lpad.com>, Jaegeuk Kim <jaegeuk@...nel.org>, Martijn Coenen <maco@...roid.com>, OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>, Hao Luo <haoluo@...gle.com>, Tony Luck <tony.luck@...el.com>, Theodore Ts'o <tytso@....edu>, Nicolas Pitre <nico@...xnic.net>, linux-ntfs-dev@...ts.sourceforge.net, Muchun Song <muchun.song@...ux.dev>, linux-f2fs-devel@...ts.sourceforge.net, "Guilherme G. Piccoli" <gpiccoli@...lia.com>, "Eric W. Biederman" <ebiederm@...ssion.com>, Anna Schumaker <anna@...nel.org>, David Woodhouse <dwmw2@...radead.org>, Brad Warrum <bwarrum@...ux.ibm.com>, Mike Kravetz <mike.kravetz@...cle.com>, linux-efi@...r.kernel.org, Martin Brandenburg <martin@...ibond.com>, Alexei Starovoitov <ast@...nel.org>, platform-driver-x86@...r.kernel.or.g, Joseph Qi <joseph.qi@...ux.alibaba.com>, Chris Mason <clm@...com>, linux-mtd@...ts.infradead.org, linux-hardening@...r.kernel.org, Joel Fernandes <joel@...lfernandes.org>, Jiri Slaby <jirislaby@...nel.org>, linux-afs@...ts.infradead.org, Ian Kent <raven@...maw.net>, Naohiro Aota <naohiro.aota@....com>, Daniel Borkmann <daniel@...earbox.net>, Miklos Szeredi <miklos@...redi.hu>, linux-rdma@...r.kernel.org, coda@...cmu.edu, Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, Ilya Dryomov <idryomov@...il.com>, Paolo Abeni <pabeni@...hat.com>, "Serge E. Hallyn" <serge@...lyn.com>, Amir Goldstein <amir73il@...il.com>, Kees Cook <keescook@...omium.org>, Arnd Bergmann <arnd@...db.de>, autofs@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>, Mark Gross <markgross@...nel.org>, Damien Le Moal <dlemoal@...nel.org>, Eric Paris <eparis@...isplace.org>, ceph-devel@...r.kernel.org, Gao Xiang <xiang@...nel.org>, gfs2@...ts.linux.dev, linux-nfs@...r.kernel.org, linux-ext4@...r.ker.nel.org, Olga Kornievskaia <kolga@...app.com>, Song Liu <song@...nel.org>, Jeff Layton <jlayton@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, linux-xfs@...r.kernel.org, Jeremy Kerr <jk@...abs.org>, Bob Peterson <rpeterso@...hat.com>, linux-fsdevel@...r.kernel.org, bpf@...r.kernel.org, ntfs3@...ts.linux.dev, linux-erofs@...ts.ozlabs.org, "David S . Miller" <davem@...emloft.net>, Chandan Babu R <chandan.babu@...cle.com>, jfs-discussion@...ts.sourceforge.net, Jan Kara <jack@...e.cz>, Neil Brown <neilb@...e.de>, Dominique Martinet <asmadeus@...ewreck.org>, Christian Schoenebeck <linux_oss@...debyte.com>, Bob Copeland <me@...copeland.com>, KP Singh <kpsingh@...nel.org>, David Sterba <dsterba@...e.cz>, Konstantin Komarov <almaz.alexandrovich@...agon-software.com>, linux-mm@...ck.org, Andreas Dilger <adilger.kernel@...ger.ca>, Arve Hjønnevåg <arve@...roid.com>, Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>, Ard Biesheuvel <ardb@...nel.org>, Anton Ivanov <anton.ivanov@...bridgegreys.com>, Andreas Gruenbacher <agruenba@...hat.com>, Richard Weinberger <richard@....at>, Mark Fasheh <mark@...heh.com>, Dai Ngo <Dai.Ngo@...cle.com>, Steve French <sfrench@...ba.org>, linux-serial@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>, Salah Triki <salah.triki@...il.com>, John Fastabend <john.fastabend@...il.com>, Evgeniy Dushistov <dushistov@...l.ru>, linux-cifs@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>, Chao Yu <chao@...nel.org>, apparmor@...ts.ubuntu.com, Josef Bacik <josef@...icpanda.com>, Tom Talpey <tom@...pey.com>, Hans de Goede <hdegoede@...hat.com>, "Tigran A. Aivazian" <aivazian.tigran@...il.com>, David Sterba <dsterba@...e.com>, Xiubo Li <xiubli@...hat.com>, Ryusuke Konishi <konishi.ryusuke@...il.com>, Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>, John Johansen <john.johansen@...onical.com>, Ritu Agarwal <rituagar@...ux.ibm.com>, Luis de Bethencourt <luisbg@...nel.org>, Netdev <netdev@...r.kernel.org>, v9fs@...sts.linux.dev, linux-unionfs@...r.kernel.org, linux-security-module@...r.kernel.org, Jeffle Xu <jefflexu@...ux.alibaba.com>, Phillip Lougher <phillip@...ashfs.org.uk>, Johannes Berg <johannes@...solutions.net>, Johannes Thumshirn <jth@...nel.org>, linuxppc-dev@...ts.ozlabs.org, linux-karma-devel@...ts.sourceforge.net, linux-btrfs@...r.kernel.org, Joel Becker <jlbec@...lplan.org> Subject: [OT] Re: [PATCH 86/87] fs: switch timespec64 fields in inode to discrete integers On Sat, Sep 30, 2023 at 09:50:41AM -0500, Steve French wrote: > On Fri, Sep 29, 2023 at 3:06 AM David Howells via samba-technical > <samba-technical@...ts.samba.org> wrote: > > > > > > Jeff Layton <jlayton@...nel.org> wrote: > > > > > Correct. We'd lose some fidelity in currently stored timestamps, but as > > > Linus and Ted pointed out, anything below ~100ns granularity is > > > effectively just noise, as that's the floor overhead for calling into > > > the kernel. It's hard to argue that any application needs that sort of > > > timestamp resolution, at least with contemporary hardware. > > > > Albeit with the danger of making Steve French very happy;-), would it make > > sense to switch internally to Microsoft-style 64-bit timestamps with their > > 100ns granularity? > > 100ns granularity does seem to make sense and IIRC was used by various > DCE standards in the 90s and 2000s (not just used for SMB2/SMB3 protocol and > various Windows filesystems) Historically it probably comes from VMS, where system time and file timestamps were a 64 bit integer counting in 100ns units starting on MJD 2400000.5 (Nov 17th 1858). Gabriel > > > -- > Thanks, > > Steve
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