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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Touch seeded packages, which is subscribed to ubuntu-meta in Ubuntu.
https://bugs.launchpad.net/bugs/1872504
Title:
date modified is wrong for files on an exfat formatted drive
Status in ubuntu-meta package in Ubuntu:
Confirmed
Bug description:
When using exfat formatted drives (e.g. my camera card) with focal
fossa any access causes the date modified to be set, even when it
would not normally be set, and it is set a month into the future.
Installing exfat-fuse and exfat-utils results in the correct
behaviour.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.18
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
ApportVersion: 2.20.11-0ubuntu26
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 13 17:27:30 2020
InstallationDate: Installed on 2020-04-12 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200409)
PackageArchitecture: all
ProcEnviron:
LANGUAGE=en_GB:en
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_GB.UTF-8
SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/ubuntu/+source/ubuntu-meta/+bug/1872504/+subscriptions
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