linux/fs/hfs
Arnd Bergmann 4ddfc3dc60 hfs/hfsplus: use 64-bit inode timestamps
The interpretation of on-disk timestamps in HFS and HFS+ differs
between 32-bit and 64-bit kernels at the moment. Use 64-bit timestamps
consistently so apply the current 64-bit behavior everyhere.

According to the official documentation for HFS+ [1], inode timestamps
are supposed to cover the time range from 1904 to 2040 as originally
used in classic MacOS.

The traditional Linux usage is to convert the timestamps into an unsigned
32-bit number based on the Unix epoch and from there to a time_t. On
32-bit systems, that wraps the time from 2038 to 1902, so the last
two years of the valid time range become garbled. On 64-bit systems,
all times before 1970 get turned into timestamps between 2038 and 2106,
which is more convenient but also different from the documented behavior.

Looking at the Darwin sources [2], it seems that MacOS is inconsistent in
yet another way: all timestamps are wrapped around to a 32-bit unsigned
number when written to the disk, but when read back, all numeric values
lower than 2082844800U are assumed to be invalid, so we cannot represent
the times before 1970 or the times after 2040.

While all implementations seem to agree on the interpretation of values
between 1970 and 2038, they often differ on the exact range they support
when reading back values outside of the common range:

MacOS (traditional):		1904-2040
Apple Documentation:		1904-2040
MacOS X source comments:	1970-2040
MacOS X source code:		1970-2038
32-bit Linux:			1902-2038
64-bit Linux:			1970-2106
hfsfuse:			1970-2040
hfsutils (32 bit, old libc)	1902-2038
hfsutils (32 bit, new libc)	1970-2106
hfsutils (64 bit)		1904-2040
hfsplus-utils			1904-2040
hfsexplorer			1904-2040
7-zip				1904-2040

Out of the above, the range from 1970 to 2106 seems to be the most useful,
as it allows using HFS and HFS+ beyond year 2038, and this matches the
behavior that most users would see today on Linux, as few people run
32-bit kernels any more.

Link: [1] https://developer.apple.com/library/archive/technotes/tn/tn1150.html
Link: [2] https://opensource.apple.com/source/hfs/hfs-407.30.1/core/MacOSStubs.c.auto.html
Link: https://lore.kernel.org/lkml/20180711224625.airwna6gzyatoowe@eaf/
Suggested-by: "Ernesto A. Fernández" <ernesto.mnd.fernandez@gmail.com>
Reviewed-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Reviewed-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
v3: revert back to 1970-2106 time range
    fix bugs found in review
    merge both patches into one
    drop cc:stable tag
v2: treat pre-1970 dates as invalid following MacOS X behavior,
    reword and expand changelog text
2019-12-18 18:07:32 +01:00
..
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
attr.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
bfind.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
bitmap.c hfs/hfsplus: convert dprint to hfs_dbg 2013-04-30 17:04:05 -07:00
bnode.c hfs/hfsplus: clean up unused variables in bnode.c 2017-11-17 16:10:03 -08:00
brec.c hfs: fix BUG on bnode parent update 2018-10-31 08:54:13 -07:00
btree.c hfs: do not free node before using 2018-11-30 14:56:14 -08:00
btree.h hfs: prevent btree data loss on ENOSPC 2018-10-31 08:54:13 -07:00
catalog.c hfs: prevent btree data loss on ENOSPC 2018-10-31 08:54:13 -07:00
dir.c hfs: use d_splice_alias() 2018-05-22 14:27:59 -04:00
extent.c fs/hfs/extent.c: fix array out of bounds read of array extent 2018-10-31 08:54:13 -07:00
hfs.h address hfs on-disk corruption robustness review comments 2008-02-06 10:41:05 -08:00
hfs_fs.h hfs/hfsplus: use 64-bit inode timestamps 2019-12-18 18:07:32 +01:00
inode.c hfs/hfsplus: use 64-bit inode timestamps 2019-12-18 18:07:32 +01:00
mdb.c Rename superblock flags (MS_xyz -> SB_xyz) 2017-11-27 13:05:09 -08:00
part_tbl.c
string.c get rid of 'parent' argument of ->d_compare() 2016-07-31 16:37:25 -04:00
super.c hfs: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
sysdep.c VFS: normal filesystems (and lustre): d_inode() annotations 2015-04-15 15:06:57 -04:00
trans.c qstr: constify instances in hfs 2016-07-20 23:30:06 -04:00