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From: Frank Sorenson <sorenson@redhat.com>
To: linux-fsdevel@vger.kernel.org
Cc: hirofumi@mail.parknet.co.jp
Subject: [PATCH V5 1/4] fat: create a function to calculate the timezone offest
Date: Sun, 30 Sep 2018 22:33:50 -0500	[thread overview]
Message-ID: <3671ff8cff5eeedbb85ebda5e4de0728920db4f6.1538363961.git.sorenson@redhat.com> (raw)
In-Reply-To: <cover.1538363961.git.sorenson@redhat.com>
In-Reply-To: <cover.1538363961.git.sorenson@redhat.com>

Move the calculation of the number of seconds in the timezone
offset to a common function.

Signed-off-by: Frank Sorenson <sorenson@redhat.com>
---
 fs/fat/misc.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index 573836dcaefc..2eca073fe785 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -185,6 +185,13 @@ static long days_in_year[] = {
 	0,   0,  31,  59,  90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0,
 };
 
+static inline int fat_tz_offset(struct msdos_sb_info *sbi)
+{
+	return (sbi->options.tz_set ?
+	       -sbi->options.time_offset :
+	       sys_tz.tz_minuteswest) * SECS_PER_MIN;
+}
+
 /* Convert a FAT time/date pair to a UNIX date (seconds since 1 1 70). */
 void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec64 *ts,
 		       __le16 __time, __le16 __date, u8 time_cs)
@@ -210,10 +217,7 @@ void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec64 *ts,
 		   + days_in_year[month] + day
 		   + DAYS_DELTA) * SECS_PER_DAY;
 
-	if (!sbi->options.tz_set)
-		second += sys_tz.tz_minuteswest * SECS_PER_MIN;
-	else
-		second -= sbi->options.time_offset * SECS_PER_MIN;
+	second += fat_tz_offset(sbi);
 
 	if (time_cs) {
 		ts->tv_sec = second + (time_cs / 100);
@@ -229,9 +233,7 @@ void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec64 *ts,
 		       __le16 *time, __le16 *date, u8 *time_cs)
 {
 	struct tm tm;
-	time64_to_tm(ts->tv_sec,
-		   (sbi->options.tz_set ? sbi->options.time_offset :
-		   -sys_tz.tz_minuteswest) * SECS_PER_MIN, &tm);
+	time64_to_tm(ts->tv_sec, -fat_tz_offset(sbi), &tm);
 
 	/*  FAT can only support year between 1980 to 2107 */
 	if (tm.tm_year < 1980 - 1900) {
-- 
2.13.6

  reply	other threads:[~2018-10-01 10:09 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-01  3:33 [PATCH V5 0/4] fat: timestamp updates Frank Sorenson
2018-10-01  3:33 ` Frank Sorenson [this message]
2018-10-01  3:33 ` [PATCH V5 2/4] fat: add functions to update and truncate timestamps appropriately Frank Sorenson
2018-10-01  3:33 ` [PATCH V5 3/4] fat: change timestamp updates to use fat_truncate_time Frank Sorenson
2018-10-01  3:33 ` [PATCH V5 4/4] fat: truncate inode timestamp updates in setattr Frank Sorenson
2018-10-01  8:14 ` [PATCH V5 0/4] fat: timestamp updates OGAWA Hirofumi

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