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fatfs: use common time_to_tm in fat_time_unix2fat()

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It is not necessary to write custom code for convert calendar time to
broken-down time.  time_to_tm() is more generic to do that.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Zhaolei 2009-12-15 16:46:57 -08:00 committed by Linus Torvalds
parent f4c54fcf3a
commit 1d81a181e0
1 changed files with 15 additions and 42 deletions
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57
fs/fat/misc.c
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@ -9,6 +9,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/buffer_head.h> #include <linux/buffer_head.h>
#include <linux/time.h>
#include "fat.h" #include "fat.h"
/* /*
@ -157,10 +158,6 @@ extern struct timezone sys_tz;
#define SECS_PER_MIN 60 #define SECS_PER_MIN 60
#define SECS_PER_HOUR (60 * 60) #define SECS_PER_HOUR (60 * 60)
#define SECS_PER_DAY (SECS_PER_HOUR * 24) #define SECS_PER_DAY (SECS_PER_HOUR * 24)
#define UNIX_SECS_1980 315532800L
#if BITS_PER_LONG == 64
#define UNIX_SECS_2108 4354819200L
#endif
/* days between 1.1.70 and 1.1.80 (2 leap days) */ /* days between 1.1.70 and 1.1.80 (2 leap days) */
#define DAYS_DELTA (365 * 10 + 2) #define DAYS_DELTA (365 * 10 + 2)
/* 120 (2100 - 1980) isn't leap year */ /* 120 (2100 - 1980) isn't leap year */
@ -213,58 +210,35 @@ void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts, void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts,
__le16 *time, __le16 *date, u8 *time_cs) __le16 *time, __le16 *date, u8 *time_cs)
{ {
time_t second = ts->tv_sec; struct tm tm;
time_t day, leap_day, month, year; time_to_tm(ts->tv_sec, sbi->options.tz_utc ? 0 :
-sys_tz.tz_minuteswest * 60, &tm);
if (!sbi->options.tz_utc) /* FAT can only support year between 1980 to 2107 */
second -= sys_tz.tz_minuteswest * SECS_PER_MIN; if (tm.tm_year < 1980 - 1900) {
/* Jan 1 GMT 00:00:00 1980. But what about another time zone? */
if (second < UNIX_SECS_1980) {
*time = 0; *time = 0;
*date = cpu_to_le16((0 << 9) | (1 << 5) | 1); *date = cpu_to_le16((0 << 9) | (1 << 5) | 1);
if (time_cs) if (time_cs)
*time_cs = 0; *time_cs = 0;
return; return;
} }
#if BITS_PER_LONG == 64 if (tm.tm_year > 2107 - 1900) {
if (second >= UNIX_SECS_2108) {
*time = cpu_to_le16((23 << 11) | (59 << 5) | 29); *time = cpu_to_le16((23 << 11) | (59 << 5) | 29);
*date = cpu_to_le16((127 << 9) | (12 << 5) | 31); *date = cpu_to_le16((127 << 9) | (12 << 5) | 31);
if (time_cs) if (time_cs)
*time_cs = 199; *time_cs = 199;
return; return;
} }
#endif
day = second / SECS_PER_DAY - DAYS_DELTA; /* from 1900 -> from 1980 */
year = day / 365; tm.tm_year -= 80;
leap_day = (year + 3) / 4; /* 0~11 -> 1~12 */
if (year > YEAR_2100) /* 2100 isn't leap year */ tm.tm_mon++;
leap_day--; /* 0~59 -> 0~29(2sec counts) */
if (year * 365 + leap_day > day) tm.tm_sec >>= 1;
year--;
leap_day = (year + 3) / 4;
if (year > YEAR_2100) /* 2100 isn't leap year */
leap_day--;
day -= year * 365 + leap_day;
if (IS_LEAP_YEAR(year) && day == days_in_year[3]) { *time = cpu_to_le16(tm.tm_hour << 11 | tm.tm_min << 5 | tm.tm_sec);
month = 2; *date = cpu_to_le16(tm.tm_year << 9 | tm.tm_mon << 5 | tm.tm_mday);
} else {
if (IS_LEAP_YEAR(year) && day > days_in_year[3])
day--;
for (month = 1; month < 12; month++) {
if (days_in_year[month + 1] > day)
break;
}
}
day -= days_in_year[month];
*time = cpu_to_le16(((second / SECS_PER_HOUR) % 24) << 11
| ((second / SECS_PER_MIN) % 60) << 5
| (second % SECS_PER_MIN) >> 1);
*date = cpu_to_le16((year << 9) | (month << 5) | (day + 1));
if (time_cs) if (time_cs)
*time_cs = (ts->tv_sec & 1) * 100 + ts->tv_nsec / 10000000; *time_cs = (ts->tv_sec & 1) * 100 + ts->tv_nsec / 10000000;
} }
@ -285,4 +259,3 @@ int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs)
} }
return err; return err;
} }