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From: Omar Sandoval <osandov@osandov.com>
To: linux-fsdevel@vger.kernel.org, Al Viro <viro@zeniv.linux.org.uk>
Cc: kernel-team@fb.com, linux-api@vger.kernel.org,
	linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net,
	linux-xfs@vger.kernel.org
Subject: [RFC PATCH 0/6] Allow setting file birth time with utimensat()
Date: Thu, 14 Feb 2019 02:00:07 -0800	[thread overview]
Message-ID: <cover.1550136164.git.osandov@fb.com> (raw)

From: Omar Sandoval <osandov@fb.com>

Hi,

Since statx was added in 4.11, userspace has had an interface for
reading btime (file creation time), but no way to set it. This RFC patch
series adds support for changing btime with utimensat(). Patch 1 adds
the VFS infrastructure, patch 2 adds the support to utimensat() with a
new flag, and the rest of the patches add filesystem support; I excluded
CIFS for now because I don't have a CIFS setup to test it on.

Updating btime is useful for at least a couple of use cases:

- Backup/restore programs (my motivation for this feature is btrfs send)
- File servers which interoperate with operating systems that allow
  updating file creation time, including Mac OS [1] and Windows [2]

I've also included a man page patch, xfs_io support, and an xfstest.

Thoughts on the implementation or the interface?

Thanks!

1: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setattrlist.2.html
2: https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-setfiletime

Omar Sandoval (6):
  fs: add btime to struct iattr
  fs: add AT_UTIME_BTIME for utimensat()
  Btrfs: add support for setting btime
  ext4: add support for setting btime
  f2fs: add support for setting btime
  xfs: add support for setting btime

 fs/attr.c                      |  6 +++
 fs/btrfs/inode.c               |  2 +
 fs/btrfs/super.c               |  4 +-
 fs/ext4/inode.c                | 15 +++++-
 fs/ext4/super.c                |  2 +-
 fs/f2fs/file.c                 | 19 ++++++--
 fs/f2fs/super.c                |  2 +-
 fs/utimes.c                    | 86 +++++++++++++++++++++-------------
 fs/xfs/libxfs/xfs_format.h     |  2 +-
 fs/xfs/libxfs/xfs_log_format.h |  2 +-
 fs/xfs/xfs_iops.c              | 11 ++++-
 fs/xfs/xfs_super.c             |  2 +-
 include/linux/fs.h             |  4 ++
 include/uapi/linux/fcntl.h     |  2 +
 14 files changed, 111 insertions(+), 48 deletions(-)

-- 
2.20.1


             reply	other threads:[~2019-02-14 10:01 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-14 10:00 Omar Sandoval [this message]
2019-02-14 10:00 ` [RFC PATCH 1/6] fs: add btime to struct iattr Omar Sandoval
2019-02-14 10:00 ` [RFC PATCH 2/6] fs: add AT_UTIME_BTIME for utimensat() Omar Sandoval
2019-02-14 10:00 ` [RFC PATCH 3/6] Btrfs: add support for setting btime Omar Sandoval
2019-02-14 10:00 ` [RFC PATCH 4/6] ext4: " Omar Sandoval
2019-02-14 10:00 ` [RFC PATCH 5/6] f2fs: " Omar Sandoval
2019-02-14 10:00 ` [RFC PATCH 6/6] xfs: " Omar Sandoval
2019-02-14 10:00 ` [PATCH] generic: add a test for AT_UTIME_BTIME Omar Sandoval
2019-02-14 10:00 ` [PATCH] utimensat2: document AT_UTIME_BTIME Omar Sandoval
2019-02-14 10:00 ` [PATCH] xfs_io: add AT_UTIME_BTIME support Omar Sandoval
2019-02-14 22:06 ` [RFC PATCH 0/6] Allow setting file birth time with utimensat() Dave Chinner
2019-02-14 23:14   ` Omar Sandoval
2019-02-15  0:16     ` Dave Chinner
2019-02-15  6:59       ` Omar Sandoval
2019-02-15 13:57         ` David Disseldorp
2019-02-17  1:57         ` Andreas Dilger
2019-02-18 22:18           ` Dave Chinner
2019-02-22 19:00             ` Omar Sandoval
2019-02-23 18:32               ` Andreas Dilger
2019-02-17 16:35   ` Boaz Harrosh
2019-02-17 17:54     ` Adam Borowski
2019-02-17 20:40       ` Andy Lutomirski
2019-02-19  4:04         ` Matthew Wilcox
2019-02-19  4:28           ` Dave Chinner
2019-02-20  7:47     ` Andreas Dilger
2019-02-15  1:57 ` Hans van Kranenburg
2019-02-15  5:39   ` Omar Sandoval
2019-02-15 18:25     ` Hans van Kranenburg
2019-02-22 15:02 ` David Sterba

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