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From: Arnd Bergmann <arnd@arndb.de>
To: linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org, joseph@codesourcery.com,
	john.stultz@linaro.org, hch@infradead.org, tglx@linutronix.de,
	geert@linux-m68k.org, lftan@altera.com, hpa@zytor.com,
	linux-fsdevel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
	ceph-devel@vger.kernel.org, cluster-devel@redhat.com,
	coda@cs.cmu.edu, codalist@TELEMANN.coda.cs.cmu.edu,
	fuse-devel@lists.sourceforge.net, linux-afs@lists.infradead.org,
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	linux-ext4@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net,
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	logfs@logfs.org, ocfs2-devel@oss.oracle.com,
	reiserfs-devel@vger.kernel.org, samba-technical@lists.samba.org,
	xfs@oss.sgi.com
Subject: [RFC 00/32] making inode time stamps y2038 ready
Date: Fri, 30 May 2014 22:01:24 +0200
Message-ID: <1401480116-1973111-1-git-send-email-arnd@arndb.de> (raw)

Based on the recent discussion about 64-bit time_t for new
architectures, and for solving the year 2038 problem in general,
I decided to try out what it would take to solve part of the
kernel side of things.

This is a proof-of-concept work to get us to the point where
two system calls (utimes and stat) provide a working interface
to user space to pass 64-bit inode time stamps in and out of
the kernel all the way to the file systems.

I picked this because it is a fairly isolated problem, as the
inode time stamps are rarely assigned to any other time values.
As a byproduct of this work, I documented for each of the file
systems we support how long the on-disk format can work[1].

Obviously we also need to convert all the other syscalls and
have a proper libc implementation using those for this to
be really useful, but it's a start and it can be tested
independently (I didn't so far, want to wait for initial
feedback).

All the interesting stuff is in the first five patches here,
the rest is the straightforward conversion of all file systems
that use 'timespec' values internally.

There are of course a number of open questions:

a) is this the right approach in general? The previous discussion
   pointed this way, but there may be other opinions.
b) what type should we use internally to represent inode time
   stamps? The code contains three different versions that would
   all work, we just have to pick a good tradeoff between
   efficiency and the range of times we want to cover.
c) Should we continue this way for all 32-bit platforms for
   consistency, including future ones, or should we go to
   different 64-bit types right away? My feeling is that the
   second approach would complicate this work.

	Arnd

[1] http://kernelnewbies.org/y2038

Arnd Bergmann (32):
  fs: introduce new 'struct inode_time'
  uapi: add struct __kernel_timespec{32,64}
  fs: introduce sys_utimens64at
  fs: introduce sys_newfstat64/sys_newfstatat64
  arch: hook up new stat and utimes syscalls
  isofs: fix timestamps beyond 2027
  fs/nfs: convert to struct inode_time
  fs/ceph: convert to 'struct inode_time'
  fs/pstore: convert to struct inode_time
  fs/coda: convert to struct inode_time
  xfs: convert to struct inode_time
  btrfs: convert to struct inode_time
  ext3: convert to struct inode_time
  ext4: convert to struct inode_time
  cifs: convert to struct inode_time
  ntfs: convert to struct inode_time
  ubifs: convert to struct inode_time
  ocfs2: convert to struct inode_time
  fs/fat: convert to struct inode_time
  afs: convert to struct inode_time
  udf: convert to struct inode_time
  fs: convert simple fs to inode_time
  logfs: convert to struct inode_time
  hfs, hfsplus: convert to struct inode_time
  gfs2: convert to struct inode_time
  reiserfs: convert to struct inode_time
  jffs2: convert to struct inode_time
  adfs: convert to struct inode_time
  f2fs: convert to struct inode_time
  fuse: convert to struct inode_time
  scsi: fnic: use current_kernel_time() for timestamp
  fs: use new inode_time definition unconditionally

 arch/alpha/kernel/osf_sys.c        |  2 +-
 arch/arm/include/asm/unistd.h      |  2 +-
 arch/arm/include/uapi/asm/stat.h   | 25 +++++++++++++++++
 arch/arm/include/uapi/asm/unistd.h |  3 +++
 arch/arm/kernel/calls.S            |  3 +++
 arch/arm64/include/asm/unistd32.h  |  5 +++-
 arch/x86/include/uapi/asm/stat.h   | 28 +++++++++++++++++++
 arch/x86/syscalls/syscall_32.tbl   |  3 +++
 drivers/block/rbd.c                |  2 +-
 drivers/firmware/efi/efi-pstore.c  | 28 +++++++++----------
 drivers/scsi/fnic/fnic_trace.c     |  2 +-
 drivers/tty/tty_io.c               |  2 +-
 drivers/usb/gadget/f_fs.c          |  2 +-
 fs/adfs/inode.c                    |  4 +--
 fs/afs/afs.h                       |  6 ++---
 fs/afs/fsclient.c                  |  2 +-
 fs/attr.c                          |  8 +++---
 fs/btrfs/file.c                    |  6 ++---
 fs/btrfs/inode.c                   |  4 +--
 fs/btrfs/ioctl.c                   |  4 +--
 fs/btrfs/root-tree.c               |  2 +-
 fs/btrfs/transaction.c             |  2 +-
 fs/ceph/cache.c                    |  2 +-
 fs/ceph/caps.c                     |  6 ++---
 fs/ceph/file.c                     |  4 +--
 fs/ceph/inode.c                    | 20 +++++++-------
 fs/ceph/super.h                    |  8 +++---
 fs/cifs/cache.c                    |  6 ++---
 fs/cifs/cifsglob.h                 |  6 ++---
 fs/cifs/cifsproto.h                |  6 ++---
 fs/cifs/cifssmb.c                  |  5 ++--
 fs/cifs/inode.c                    |  2 +-
 fs/cifs/netmisc.c                  | 15 ++++++-----
 fs/coda/coda_linux.c               | 18 ++++++++-----
 fs/compat.c                        | 19 ++-----------
 fs/configfs/inode.c                |  6 ++---
 fs/cramfs/inode.c                  |  2 +-
 fs/ext3/inode.c                    |  4 +--
 fs/ext4/ext4.h                     | 10 +++----
 fs/ext4/extents.c                  |  2 +-
 fs/f2fs/file.c                     |  6 ++---
 fs/fat/dir.c                       |  2 +-
 fs/fat/fat.h                       |  6 ++---
 fs/fat/misc.c                      |  4 +--
 fs/fat/namei_msdos.c               |  8 +++---
 fs/fat/namei_vfat.c                | 10 +++----
 fs/fuse/inode.c                    |  6 ++---
 fs/gfs2/dir.c                      |  6 ++---
 fs/gfs2/glops.c                    |  4 +--
 fs/hfs/hfs_fs.h                    |  2 +-
 fs/hfsplus/hfsplus_fs.h            |  2 +-
 fs/inode.c                         | 18 ++++++-------
 fs/isofs/util.c                    |  2 +-
 fs/jffs2/os-linux.h                |  2 +-
 fs/locks.c                         |  4 +--
 fs/logfs/readwrite.c               | 18 ++++++-------
 fs/nfs/callback.h                  |  4 +--
 fs/nfs/callback_xdr.c              |  6 ++---
 fs/nfs/file.c                      |  2 +-
 fs/nfs/fscache-index.c             |  8 +++---
 fs/nfs/inode.c                     | 10 +++----
 fs/nfs/internal.h                  |  4 +--
 fs/nfs/netns.h                     |  2 +-
 fs/nfs/nfs2xdr.c                   |  8 +++---
 fs/nfs/nfs3xdr.c                   | 10 +++----
 fs/nfs/nfs4xdr.c                   | 20 +++++++-------
 fs/nfsd/nfs3xdr.c                  |  6 ++---
 fs/nfsd/nfsfh.h                    |  4 +--
 fs/nfsd/nfsxdr.c                   |  2 +-
 fs/ntfs/inode.c                    | 12 ++++-----
 fs/ntfs/time.h                     |  8 +++---
 fs/ocfs2/dlmglue.c                 | 16 +++++------
 fs/ocfs2/file.c                    |  6 ++---
 fs/ocfs2/ocfs2.h                   |  2 +-
 fs/pstore/inode.c                  |  2 +-
 fs/pstore/internal.h               |  2 +-
 fs/pstore/platform.c               |  2 +-
 fs/pstore/ram.c                    | 18 +++++++------
 fs/reiserfs/namei.c                |  2 +-
 fs/reiserfs/xattr.c                |  4 +--
 fs/stat.c                          | 55 ++++++++++++++++++++++++++++++++++++++
 fs/ubifs/dir.c                     |  2 +-
 fs/ubifs/file.c                    | 16 +++++------
 fs/ubifs/misc.h                    |  2 +-
 fs/udf/udf_i.h                     |  2 +-
 fs/udf/udf_sb.h                    |  2 +-
 fs/udf/udfdecl.h                   |  7 ++---
 fs/udf/udftime.c                   |  7 ++---
 fs/utimes.c                        | 47 +++++++++++++++++++++++++++-----
 fs/xfs/time.h                      |  4 +--
 fs/xfs/xfs_inode.c                 |  2 +-
 fs/xfs/xfs_iops.c                  |  2 +-
 fs/xfs/xfs_trans_inode.c           |  6 ++---
 include/linux/ceph/decode.h        |  8 +++---
 include/linux/ceph/osd_client.h    |  4 +--
 include/linux/compat.h             |  2 +-
 include/linux/fs.h                 | 32 +++++++++++-----------
 include/linux/nfs_fs_sb.h          |  2 +-
 include/linux/nfs_xdr.h            | 14 +++++-----
 include/linux/pstore.h             |  4 +--
 include/linux/stat.h               |  6 ++---
 include/linux/syscalls.h           |  9 ++++++-
 include/linux/time.h               | 44 +++++++++++++++++++++++++++---
 include/uapi/asm-generic/stat.h    | 29 ++++++++++++++++++--
 include/uapi/asm-generic/unistd.h  |  8 +++++-
 include/uapi/linux/coda.h          |  1 +
 include/uapi/linux/time.h          | 40 ++++++++++++++++++++++++++-
 init/initramfs.c                   |  2 +-
 kernel/audit.c                     |  2 +-
 kernel/auditsc.c                   |  2 +-
 kernel/time.c                      | 44 +++++++++++++++++++++++++-----
 kernel/time/timekeeping.c          | 16 +++++++++++
 net/ceph/auth_x.c                  |  2 +-
 net/ceph/osd_client.c              |  4 +--
 114 files changed, 642 insertions(+), 333 deletions(-)

-- 
1.8.3.2

Bcc: "J. Bruce Fields" <bfields@fieldses.org>
Bcc: "Theodore Ts'o" <tytso@mit.edu>
Bcc: Adrian Hunter <adrian.hunter@intel.com>
Bcc: Andreas Dilger <adilger.kernel@dilger.ca>
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Cc: ceph-devel@vger.kernel.org
Cc: cluster-devel@redhat.com
Cc: coda@cs.cmu.edu
Cc: codalist@coda.cs.cmu.edu
Cc: fuse-devel@lists.sourceforge.net
Cc: linux-afs@lists.infradead.org
Cc: linux-btrfs@vger.kernel.org
Cc: linux-cifs@vger.kernel.org
Cc: linux-ext4@vger.kernel.org
Cc: linux-f2fs-devel@lists.sourceforge.net
Cc: linux-mtd@lists.infradead.org
Cc: linux-nfs@vger.kernel.org
Cc: linux-ntfs-dev@lists.sourceforge.net
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Cc: ocfs2-devel@oss.oracle.com
Cc: reiserfs-devel@vger.kernel.org
Cc: samba-technical@lists.samba.org
Cc: xfs@oss.sgi.com

             reply index

Thread overview: 124+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-30 20:01 Arnd Bergmann [this message]
2014-05-30 20:01 ` [RFC 01/32] fs: introduce new 'struct inode_time' Arnd Bergmann
2014-05-31  7:56   ` Geert Uytterhoeven
2014-05-31  8:39     ` Andreas Schwab
2014-05-31 13:19       ` Geert Uytterhoeven
2014-05-31 13:46         ` Andreas Schwab
2014-05-31 14:54       ` Arnd Bergmann
2014-05-31 16:15         ` Geert Uytterhoeven
2014-05-31  9:03   ` H. Peter Anvin
2014-05-31 14:53     ` Arnd Bergmann
2014-05-31 14:55       ` H. Peter Anvin
2014-05-30 20:01 ` [RFC 02/32] uapi: add struct __kernel_timespec{32,64} Arnd Bergmann
2014-05-30 20:18   ` H. Peter Anvin
2014-05-31 15:09     ` Arnd Bergmann
2014-05-30 20:01 ` [RFC 03/32] fs: introduce sys_utimens64at Arnd Bergmann
2014-05-31  9:22   ` Andreas Schwab
2014-05-31 14:55     ` Arnd Bergmann
2014-05-30 20:01 ` [RFC 04/32] fs: introduce sys_newfstat64/sys_newfstatat64 Arnd Bergmann
2014-05-30 20:01 ` [RFC 05/32] arch: hook up new stat and utimes syscalls Arnd Bergmann
2014-05-30 20:01 ` [RFC 06/32] isofs: fix timestamps beyond 2027 Arnd Bergmann
2014-05-31  7:59   ` Geert Uytterhoeven
2014-05-31  8:47     ` H. Peter Anvin
2014-05-30 20:01 ` [RFC 07/32] fs/nfs: convert to struct inode_time Arnd Bergmann
2014-05-30 20:01 ` [RFC 08/32] fs/ceph: convert to 'struct inode_time' Arnd Bergmann
2014-05-30 20:01 ` [RFC 09/32] fs/pstore: convert to struct inode_time Arnd Bergmann
2014-05-30 21:14   ` Kees Cook
2014-05-30 20:01 ` [RFC 10/32] fs/coda: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 11/32] xfs: " Arnd Bergmann
2014-05-31  0:37   ` Dave Chinner
2014-05-31  0:41     ` H. Peter Anvin
2014-05-31  1:14       ` Dave Chinner
2014-05-31  1:22         ` H. Peter Anvin
2014-05-31  5:54           ` Dave Chinner
2014-05-31  8:41             ` H. Peter Anvin
2014-05-31 15:46               ` Nicolas Pitre
2014-06-01 19:56                 ` Arnd Bergmann
2014-06-01 20:26                   ` H. Peter Anvin
2014-06-02 11:02                     ` Arnd Bergmann
2014-06-02  1:36                   ` Nicolas Pitre
2014-06-02  2:22                     ` Dave Chinner
2014-06-02  7:09                       ` Geert Uytterhoeven
2014-06-02 10:56                     ` Arnd Bergmann
2014-06-02 11:57                       ` Theodore Ts'o
2014-06-02 12:38                         ` Arnd Bergmann
2014-06-02 13:15                           ` Theodore Ts'o
2014-06-02 12:52                         ` Arnd Bergmann
2014-06-02 13:07                           ` Theodore Ts'o
2014-06-02 15:01                             ` Arnd Bergmann
2014-06-02 14:52                         ` H. Peter Anvin
2014-06-02 15:04                       ` Chuck Lever
2014-06-02 15:31                         ` Theodore Ts'o
2014-06-02 17:12                           ` H. Peter Anvin
2014-06-02 18:50                             ` Arnd Bergmann
2014-06-02 22:29                             ` Theodore Ts'o
2014-06-02 22:32                               ` H. Peter Anvin
2014-06-02 23:32                                 ` Theodore Ts'o
2014-06-02 23:33                                   ` H. Peter Anvin
2014-06-03 13:09                                   ` Roger Willcocks
2014-06-02 18:52                         ` Arnd Bergmann
2014-06-02 18:58                         ` Roger Willcocks
2014-06-02 19:04                           ` Chuck Lever
2014-06-02 19:10                             ` Arnd Bergmann
2014-06-01  0:39               ` Dave Chinner
2014-06-02 14:00             ` Joseph S. Myers
2014-05-31 15:37         ` Arnd Bergmann
2014-06-01  0:24           ` Dave Chinner
2014-06-02  0:28             ` Dave Chinner
2014-06-02 11:35               ` Roger Willcocks
2014-06-02 11:43               ` Arnd Bergmann
2014-06-03  0:32                 ` Dave Chinner
2014-06-03  7:33                   ` Arnd Bergmann
2014-06-03  8:41                     ` Dave Chinner
2014-06-03  9:16                       ` Arnd Bergmann
2014-05-30 20:01 ` [RFC 12/32] btrfs: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 13/32] ext3: " Arnd Bergmann
2014-05-31  9:10   ` H. Peter Anvin
2014-05-31 14:32     ` Arnd Bergmann
2014-05-30 20:01 ` [RFC 14/32] ext4: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 15/32] cifs: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 16/32] ntfs: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 17/32] ubifs: " Arnd Bergmann
2014-06-02  7:54   ` Artem Bityutskiy
2014-05-30 20:01 ` [RFC 18/32] ocfs2: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 19/32] fs/fat: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 20/32] afs: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 21/32] udf: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 22/32] fs: convert simple fs to inode_time Arnd Bergmann
2014-05-30 23:06   ` Greg Kroah-Hartman
2014-05-30 20:01 ` [RFC 23/32] logfs: convert to struct inode_time Arnd Bergmann
2014-05-30 20:01 ` [RFC 24/32] hfs, hfsplus: " Arnd Bergmann
2014-05-31 14:23   ` Vyacheslav Dubeyko
2014-05-30 20:01 ` [RFC 25/32] gfs2: " Arnd Bergmann
2014-06-02  9:52   ` Steven Whitehouse
2014-05-30 20:01 ` [RFC 26/32] reiserfs: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 27/32] jffs2: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 28/32] adfs: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 29/32] f2fs: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 30/32] fuse: " Arnd Bergmann
2014-05-30 20:01 ` [RFC 31/32] scsi: fnic: use current_kernel_time() for timestamp Arnd Bergmann
2014-05-30 20:01 ` [RFC 32/32] fs: use new inode_time definition unconditionally Arnd Bergmann
2014-05-31 14:30 ` [RFC 00/32] making inode time stamps y2038 ready Vyacheslav Dubeyko
2014-06-03 12:21   ` Arnd Bergmann
2014-05-31 14:51 ` Richard Cochran
2014-05-31 15:23   ` Arnd Bergmann
2014-05-31 18:22     ` Richard Cochran
2014-05-31 19:34       ` H. Peter Anvin
2014-06-01  4:46         ` Richard Cochran
2014-06-01  4:44     ` Richard Cochran
2014-06-02 13:52 ` Joseph S. Myers
2014-06-02 19:19   ` Arnd Bergmann
2014-06-02 19:26     ` H. Peter Anvin
2014-06-02 19:55       ` Arnd Bergmann
2014-06-02 21:57         ` H. Peter Anvin
2014-06-03 14:22           ` Arnd Bergmann
2014-06-03 14:33             ` Joseph S. Myers
2014-06-03 14:37               ` Arnd Bergmann
2014-06-03 21:38             ` Dave Chinner
2014-06-04 15:03               ` Arnd Bergmann
2014-06-04 17:30                 ` Nicolas Pitre
2014-06-04 19:24                   ` Arnd Bergmann
2014-06-05  0:10                     ` H. Peter Anvin
2014-06-10  9:54                       ` Arnd Bergmann
2014-06-02 21:02     ` Joseph S. Myers
2014-06-04 15:05       ` Arnd Bergmann

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