I think I found the bug in the linux 5.4, but I have no idea whether or how to
submit a patch...
The handling of exfat changes completely in the following (but not LTS)
versions.
In the file drivers/staging/exfat/exfat_super.c, in lines 60-
static void exfat_time_fat2unix(struct timespec64 *ts, struct date_time_t *tp)
{
ts->tv_sec = mktime64(tp->Year + 1980, tp->Month + 1, tp->Day, //
shouldn't it be tp->Month, tp->Day .... ?????!!!
tp->Hour, tp->Minute, tp->Second);
ts->tv_nsec = tp->MilliSecond * NSEC_PER_MSEC;
}
static void exfat_time_unix2fat(struct timespec64 *ts, struct date_time_t *tp)
{
time64_t second = ts->tv_sec;
struct tm tm;
time64_to_tm(second, 0, &tm);
[...]
tp->MilliSecond = ts->tv_nsec / NSEC_PER_MSEC;
tp->Second = tm.tm_sec;
tp->Minute = tm.tm_min;
tp->Hour = tm.tm_hour;
tp->Day = tm.tm_mday;
tp->Month = tm.tm_mon + 1;
tp->Year = tm.tm_year + 1900 - 1980;
}
The meaning of the field Month in struct date_time_t has no
documentation in the header exfat.h, but the function unix2fat produces
a month from 1-12 in date_time_t by adding 1 to the result of
time64_to_tm.
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https://bugs.launchpad.net/bugs/1872504
Title:
date modified is wrong for files on an exfat formatted drive
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