diff options
| author | Chung-Chiang Cheng <cccheng@synology.com> | 2022-04-06 12:55:52 +0300 |
|---|---|---|
| committer | Namjae Jeon <linkinjeon@kernel.org> | 2022-05-23 05:17:29 +0300 |
| commit | 9b002894b4c252169abc26720452bf3746114b20 (patch) | |
| tree | 079800f257f77d6057d9d4b917159d6754a957eb /fs/exfat/misc.c | |
| parent | d8dad2588addd1d861ce19e7df3b702330f0c7e3 (diff) | |
| download | linux-9b002894b4c252169abc26720452bf3746114b20.tar.xz | |
exfat: introduce mount option 'sys_tz'
EXFAT_TZ_VALID bit in {create,modify,access}_tz is corresponding to
OffsetValid field in exfat specification [1]. When this bit isn't
set, timestamps should be treated as having the same UTC offset as
the current local time.
Currently, there is an option 'time_offset' for users to specify the
UTC offset for this issue. This patch introduces a new mount option
'sys_tz' to use system timezone as time offset.
Link: [1] https://docs.microsoft.com/en-us/windows/win32/fileio/exfat-specification#74102-offsetvalid-field
Signed-off-by: Chung-Chiang Cheng <cccheng@synology.com>
Acked-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Diffstat (limited to 'fs/exfat/misc.c')
| -rw-r--r-- | fs/exfat/misc.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/exfat/misc.c b/fs/exfat/misc.c index d5bd8e6d9741..9380e0188b55 100644 --- a/fs/exfat/misc.c +++ b/fs/exfat/misc.c @@ -74,6 +74,13 @@ static void exfat_adjust_tz(struct timespec64 *ts, u8 tz_off) ts->tv_sec += TIMEZONE_SEC(0x80 - tz_off); } +static inline int exfat_tz_offset(struct exfat_sb_info *sbi) +{ + if (sbi->options.sys_tz) + return -sys_tz.tz_minuteswest; + return sbi->options.time_offset; +} + /* Convert a EXFAT time/date pair to a UNIX date (seconds since 1 1 70). */ void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, u8 tz, __le16 time, __le16 date, u8 time_cs) @@ -96,8 +103,7 @@ void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, /* Adjust timezone to UTC0. */ exfat_adjust_tz(ts, tz & ~EXFAT_TZ_VALID); else - /* Convert from local time to UTC using time_offset. */ - ts->tv_sec -= sbi->options.time_offset * SECS_PER_MIN; + ts->tv_sec -= exfat_tz_offset(sbi) * SECS_PER_MIN; } /* Convert linear UNIX date to a EXFAT time/date pair. */ |