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@xxxxxxxxxxxx> Bcc: "Theodore Ts'o" <tytso@xxxxxxx> Bcc: Adrian Hunter <adrian.hunter@xxxxxxxxx> Bcc: Andreas Dilger <adilger.kernel@xxxxxxxxx> Bcc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Bcc: Anton Altaparmakov <anton@xxxxxxxxxx> Bcc: Anton Vorontsov <anton@xxxxxxxxxx> Bcc: Artem Bityutskiy <dedekind1@xxxxxxxxx> Bcc: Brian Uchino <buchino@xxxxxxxxx> Bcc: Chris Mason <clm@xxxxxx> Bcc: Colin Cross <ccross@xxxxxxxxxxx> Bcc: Dave Chinner <david@xxxxxxxxxxxxx> Bcc: David Howells <dhowells@xxxxxxxxxx> Bcc: David Woodhouse <dwmw2@xxxxxxxxxxxxx> Bcc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Bcc: Hiral Patel <hiralpat@xxxxxxxxx> Bcc: Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx> Bcc: Jan Harkes <jaharkes@xxxxxxxxxx> Bcc: Jan Kara <jack@xxxxxxx> Bcc: Joel Becker <jlbec@xxxxxxxxxxxx> Bcc: Joern Engel <joern@xxxxxxxxx> Bcc: Josef Bacik <jbacik@xxxxxx> Bcc: Kees Cook <keescook@xxxxxxxxxxxx> Bcc: Mark Fasheh <mfasheh@xxxxxxxx> Bcc: Miklos Szeredi <miklos@xxxxxxxxxx> Bcc: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx> Bcc: Prasad Joshi <prasadjoshi.linux@xxxxxxxxx> Bcc: Sage Weil <sage@xxxxxxxxxxx> Bcc: Steve French <sfrench@xxxxxxxxx> Bcc: Steven Whitehouse <swhiteho@xxxxxxxxxx> Bcc: Suma Ramars <sramars@xxxxxxxxx> Bcc: Tony Luck <tony.luck@xxxxxxxxx> Cc: ceph-devel@xxxxxxxxxxxxxxx Cc: cluster-devel@xxxxxxxxxx Cc: coda@xxxxxxxxxx Cc: codalist@xxxxxxxxxxxxxxx Cc: fuse-devel@xxxxxxxxxxxxxxxxxxxxx Cc: linux-afs@xxxxxxxxxxxxxxxxxxx Cc: linux-btrfs@xxxxxxxxxxxxxxx Cc: linux-cifs@xxxxxxxxxxxxxxx Cc: linux-ext4@xxxxxxxxxxxxxxx Cc: linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx Cc: linux-mtd@xxxxxxxxxxxxxxxxxxx Cc: linux-nfs@xxxxxxxxxxxxxxx Cc: linux-ntfs-dev@xxxxxxxxxxxxxxxxxxxxx Cc: linux-scsi@xxxxxxxxxxxxxxx Cc: logfs@xxxxxxxxx Cc: ocfs2-devel@xxxxxxxxxxxxxx Cc: reiserfs-devel@xxxxxxxxxxxxxxx Cc: samba-technical@xxxxxxxxxxxxxxx Cc: xfs@xxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
