linux-kernel - RE: [PATCH v2 09/13] exfat: add misc operations

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Message-ID: <001f01d5c745$7d0a3730$771ea590$@samsung.com>
Date:   Fri, 10 Jan 2020 08:35:34 +0900
From:   "Namjae Jeon" <namjae.jeon@...sung.com>
To:     "'Arnd Bergmann'" <arnd@...db.de>
Cc:     <linux-kernel@...r.kernel.org>,
        "'Linux FS-devel Mailing List'" <linux-fsdevel@...r.kernel.org>,
        "'gregkh'" <gregkh@...uxfoundation.org>,
        "'Valdis Kletnieks'" <valdis.kletnieks@...edu>,
        "'Christoph Hellwig'" <hch@....de>, <linkinjeon@...il.com>,
        <Markus.Elfring@....de>, <sj1557.seo@...sung.com>
Subject: RE: [PATCH v2 09/13] exfat: add misc operations

> On Tue, Nov 19, 2019 at 8:16 AM Namjae Jeon <namjae.jeon@...sung.com>
> wrote:
> 
> > +/* <linux/time.h> externs sys_tz
> > + * extern struct timezone sys_tz;
> > + */
> > +#define UNIX_SECS_1980    315532800L
> > +
> > +#if BITS_PER_LONG == 64
> > +#define UNIX_SECS_2108    4354819200L
> > +#endif
> > +
> > +/* days between 1970/01/01 and 1980/01/01 (2 leap days) */
> > +#define DAYS_DELTA_DECADE    (365 * 10 + 2)
> > +/* 120 (2100 - 1980) isn't leap year */
> > +#define NO_LEAP_YEAR_2100    (120)
> > +#define IS_LEAP_YEAR(y)    (!((y) & 0x3) && (y) != NO_LEAP_YEAR_2100)
> > +
> > +#define SECS_PER_MIN    (60)
> > +#define SECS_PER_HOUR   (60 * SECS_PER_MIN)
> > +#define SECS_PER_DAY    (24 * SECS_PER_HOUR)
> 
> None of this code should exist, just use time64_to_tm() and tm_to_time64()
Okay, Will use them.
> 
> > +       if (!sbi->options.tz_utc)
> > +               ts->tv_sec += sys_tz.tz_minuteswest * SECS_PER_MIN;
> 
> I would make tz_utc the default here. Not sure what windows uses or what
> the specification says, but sys_tz is a rather unreliable interface, and
> it's better to not use that at all if it can be avoided.
> 
> It may be useful to have a mount option for the time zone offset instead.
Okay, Will add a time_zone_offset mount option.
> 
> > +       ts->tv_nsec = 0;
> > +}
> > +
> > +/* Convert linear UNIX date to a FAT time/date pair. */ void
> > +exfat_time_unix2fat(struct exfat_sb_info *sbi, struct timespec64 *ts,
> > +               struct exfat_date_time *tp)
> 
> This is basically time64_to_tm(), just be careful about to check whether
> months are counted from 1 or 0.
Okay.

Thanks for your review!
> 
>        Arnd