From: "Pali Rohár" <pali.rohar@gmail.com>
To: Namjae Jeon <linkinjeon@gmail.com>
Cc: Namjae Jeon <namjae.jeon@samsung.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
gregkh@linuxfoundation.org, valdis.kletnieks@vt.edu, hch@lst.de,
sj1557.seo@samsung.com
Subject: Re: [PATCH v9 09/13] exfat: add misc operations
Date: Fri, 3 Jan 2020 19:36:04 +0100 [thread overview]
Message-ID: <20200103183604.xzfvnu2qivqnqkkx@pali> (raw)
In-Reply-To: <20200102114034.bjezqs45xecz4atd@pali>
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On Thursday 02 January 2020 12:40:34 Pali Rohár wrote:
> On Thursday 02 January 2020 20:30:03 Namjae Jeon wrote:
> > 2020-01-02 18:19 GMT+09:00, Pali Rohár <pali.rohar@gmail.com>:
> > > On Thursday 02 January 2020 16:20:32 Namjae Jeon wrote:
> > >> This adds the implementation of misc operations for exfat.
> > >>
> > >> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
> > >> Signed-off-by: Sungjong Seo <sj1557.seo@samsung.com>
> > >> ---
> > >> fs/exfat/misc.c | 253 ++++++++++++++++++++++++++++++++++++++++++++++++
> > >> 1 file changed, 253 insertions(+)
> > >> create mode 100644 fs/exfat/misc.c
> > >>
> > >> diff --git a/fs/exfat/misc.c b/fs/exfat/misc.c
> > >> new file mode 100644
> > >> index 000000000000..7f533bcb3b3f
> > >> --- /dev/null
> > >> +++ b/fs/exfat/misc.c
> > >
> > > ...
> > >
> > >> +/* <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
> > >
> > > ...
> > >
> > >> +#define TIMEZONE_CUR_OFFSET() ((sys_tz.tz_minuteswest / (-15)) & 0x7F)
> > >> +/* 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)
> > >> +{
> > >> + time_t second = ts->tv_sec;
> > >> + time_t day, month, year;
> > >> + time_t ld; /* leap day */
> > >
> > > Question for other maintainers: Has kernel code already time_t defined
> > > as 64bit? Or it is still just 32bit and 32bit systems and some time64_t
> > > needs to be used? I remember that there was discussion about these
> > > problems, but do not know if it was changed/fixed or not... Just a
> > > pointer for possible Y2038 problem. As "ts" is of type timespec64, but
> > > "second" of type time_t.
> > My bad, I will change it with time64_t.
>
> Now I have looked into sources and time_t is just typedef from
> __kernel_old_time_t type. So it looks like that time64_t is the type
> which should be used in new code.
>
> But somebody else should confirm this information.
>
> > >
> > >> +
> > >> + /* Treats as local time with proper time */
> > >> + second -= sys_tz.tz_minuteswest * SECS_PER_MIN;
> > >> + tp->timezone.valid = 1;
> > >> + tp->timezone.off = TIMEZONE_CUR_OFFSET();
> > >> +
> > >> + /* Jan 1 GMT 00:00:00 1980. But what about another time zone? */
> > >> + if (second < UNIX_SECS_1980) {
> > >> + tp->second = 0;
> > >> + tp->minute = 0;
> > >> + tp->hour = 0;
> > >> + tp->day = 1;
> > >> + tp->month = 1;
> > >> + tp->year = 0;
> > >> + return;
> > >> + }
> > >> +
> > >> + if (second >= UNIX_SECS_2108) {
> > >
> > > Hello, this code cause compile errors on 32bit systems as UNIX_SECS_2108
> > > macro is not defined when BITS_PER_LONG == 32.
> > >
> > > Value 4354819200 really cannot fit into 32bit signed integer, so you
> > > should use 64bit signed integer. I would suggest to define this macro
> > > value via LL not just L suffix (and it would work on both 32 and 64bit)
> > Okay.
> > >
> > > #define UNIX_SECS_2108 4354819200LL
> > >
> > >> + tp->second = 59;
> > >> + tp->minute = 59;
> > >> + tp->hour = 23;
> > >> + tp->day = 31;
> > >> + tp->month = 12;
> > >> + tp->year = 127;
> > >> + return;
> > >> + }
> > Okay, I will check it.
> > Thanks for your review!
Also I think that you should apply this Arnd's patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=44f6b40c225eb8e82eba8fd96d8f3fb843bc5a09
And maybe it is a good idea to look at applied staging patches:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/drivers/staging/exfat
--
Pali Rohár
pali.rohar@gmail.com
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next prev parent reply other threads:[~2020-01-03 18:36 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200102082359epcas1p2aa1eca9729a6ec54ec3b8140615dca6e@epcas1p2.samsung.com>
2020-01-02 8:20 ` [PATCH v9 00/13] add the latest exfat driver Namjae Jeon
[not found] ` <CGME20200102082400epcas1p4cd0ad14967bd8d231fc0efcede8bd99c@epcas1p4.samsung.com>
2020-01-02 8:20 ` [PATCH v9 01/13] exfat: add in-memory and on-disk structures and headers Namjae Jeon
2020-01-08 17:08 ` Christoph Hellwig
2020-01-09 22:43 ` Namjae Jeon
[not found] ` <CGME20200102082401epcas1p2f33f3c11ecedabff2165ba216854d8fe@epcas1p2.samsung.com>
2020-01-02 8:20 ` [PATCH v9 02/13] exfat: add super block operations Namjae Jeon
2020-01-08 17:21 ` Christoph Hellwig
2020-01-09 23:21 ` Namjae Jeon
[not found] ` <CGME20200102082402epcas1p47cdc0873473f99c5d81f56865bb94abc@epcas1p4.samsung.com>
2020-01-02 8:20 ` [PATCH v9 03/13] exfat: add inode operations Namjae Jeon
2020-01-08 17:50 ` Christoph Hellwig
2020-01-09 23:23 ` Namjae Jeon
[not found] ` <CGME20200102082402epcas1p22cdd763b3c72166c0a91f9ba8db6a9b8@epcas1p2.samsung.com>
2020-01-02 8:20 ` [PATCH v9 04/13] exfat: add directory operations Namjae Jeon
2020-01-08 17:52 ` Christoph Hellwig
[not found] ` <CGME20200102082403epcas1p432813ab4fd8ed07075e89e48a0ce34d7@epcas1p4.samsung.com>
2020-01-02 8:20 ` [PATCH v9 05/13] exfat: add file operations Namjae Jeon
2020-01-08 17:56 ` Christoph Hellwig
[not found] ` <CGME20200102082404epcas1p4a28c34799df317165ddf8bd5a0b433e9@epcas1p4.samsung.com>
2020-01-02 8:20 ` [PATCH v9 06/13] exfat: add exfat entry operations Namjae Jeon
2020-01-08 18:00 ` Christoph Hellwig
2020-01-09 23:24 ` Namjae Jeon
[not found] ` <CGME20200102082405epcas1p41dd62d00104cb0daa4fe85641cb8ee22@epcas1p4.samsung.com>
2020-01-02 8:20 ` [PATCH v9 07/13] exfat: add bitmap operations Namjae Jeon
2020-01-08 18:01 ` Christoph Hellwig
[not found] ` <CGME20200102082405epcas1p160f24165fc8ae8f51080e75bb585e0c7@epcas1p1.samsung.com>
2020-01-02 8:20 ` [PATCH v9 08/13] exfat: add exfat cache Namjae Jeon
2020-01-08 18:02 ` Christoph Hellwig
[not found] ` <CGME20200102082406epcas1p268f260d90213bdaabee25a7518f86625@epcas1p2.samsung.com>
2020-01-02 8:20 ` [PATCH v9 09/13] exfat: add misc operations Namjae Jeon
2020-01-02 9:19 ` Pali Rohár
2020-01-02 11:30 ` Namjae Jeon
2020-01-02 11:40 ` Pali Rohár
2020-01-03 18:36 ` Pali Rohár [this message]
2020-01-03 23:28 ` Namjae Jeon
2020-01-08 18:03 ` Christoph Hellwig
2020-01-08 19:40 ` Arnd Bergmann
2020-01-09 23:32 ` Namjae Jeon
[not found] ` <CGME20200102082407epcas1p4cf10cd3d0ca2903707ab01b1cc523a05@epcas1p4.samsung.com>
2020-01-02 8:20 ` [PATCH v9 10/13] exfat: add nls operations Namjae Jeon
2020-01-02 13:55 ` Pali Rohár
2020-01-03 7:06 ` Namjae Jeon
2020-01-03 8:44 ` Pali Rohár
2020-01-02 14:20 ` Pali Rohár
2020-01-03 4:44 ` Namjae Jeon
2020-01-03 9:40 ` Pali Rohár
2020-01-03 12:31 ` Pali Rohár
2020-01-09 22:35 ` Namjae Jeon
2020-01-05 15:24 ` Pali Rohár
2020-01-05 16:51 ` Pali Rohár
2020-01-06 19:46 ` Gabriel Krisman Bertazi
2020-01-07 11:52 ` Pali Rohár
2020-01-09 22:04 ` [PATCH v9 09/13] exfat: add misc operations Valdis Klētnieks
2020-01-09 23:41 ` Namjae Jeon
2020-01-09 22:37 ` [PATCH v9 10/13] exfat: add nls operations Namjae Jeon
[not found] ` <CGME20200102082408epcas1p28d46af675103d2cd92232a4f7b712c46@epcas1p2.samsung.com>
2020-01-02 8:20 ` [PATCH v9 11/13] exfat: add Kconfig and Makefile Namjae Jeon
2020-01-02 12:53 ` Pali Rohár
[not found] ` <CGME20200102082408epcas1p194621a6aa6729011703f0c5a076a7396@epcas1p1.samsung.com>
2020-01-02 8:20 ` [PATCH v9 12/13] exfat: add exfat in fs/Kconfig and fs/Makefile Namjae Jeon
2020-01-02 12:58 ` Pali Rohár
2020-01-02 13:07 ` Namjae Jeon
2020-01-02 13:10 ` Pali Rohár
2020-01-02 14:19 ` Greg KH
2020-01-02 23:48 ` Namjae Jeon
2020-01-04 5:22 ` kbuild test robot
[not found] ` <CGME20200102082409epcas1p4210cf0ea40d23689c4a5ba18b50979cf@epcas1p4.samsung.com>
2020-01-02 8:20 ` [PATCH v9 13/13] MAINTAINERS: add exfat filesystem Namjae Jeon
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