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-rw-r--r--fs/fat/fat.h3
-rw-r--r--fs/fat/inode.c25
-rw-r--r--fs/fat/misc.c9
3 files changed, 28 insertions, 9 deletions
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index 623f36f0423b..12701a567752 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -29,6 +29,7 @@ struct fat_mount_options {
unsigned short fs_fmask;
unsigned short fs_dmask;
unsigned short codepage; /* Codepage for shortname conversions */
+ int time_offset; /* Offset of timestamps from UTC (in minutes) */
char *iocharset; /* Charset used for filename input/display */
unsigned short shortname; /* flags for shortname display/create rule */
unsigned char name_check; /* r = relaxed, n = normal, s = strict */
@@ -45,7 +46,7 @@ struct fat_mount_options {
flush:1, /* write things quickly */
nocase:1, /* Does this need case conversion? 0=need case conversion*/
usefree:1, /* Use free_clusters for FAT32 */
- tz_utc:1, /* Filesystem timestamps are in UTC */
+ tz_set:1, /* Filesystem timestamps' offset set */
rodir:1, /* allow ATTR_RO for directory */
discard:1, /* Issue discard requests on deletions */
nfs:1; /* Do extra work needed for NFS export */
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 7b186a5d51b1..59ac83be2d5b 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -778,8 +778,12 @@ static int fat_show_options(struct seq_file *m, struct dentry *root)
}
if (opts->flush)
seq_puts(m, ",flush");
- if (opts->tz_utc)
- seq_puts(m, ",tz=UTC");
+ if (opts->tz_set) {
+ if (opts->time_offset)
+ seq_printf(m, ",time_offset=%d", opts->time_offset);
+ else
+ seq_puts(m, ",tz=UTC");
+ }
if (opts->errors == FAT_ERRORS_CONT)
seq_puts(m, ",errors=continue");
else if (opts->errors == FAT_ERRORS_PANIC)
@@ -801,7 +805,8 @@ enum {
Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
Opt_obsolete, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont,
- Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_err,
+ Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_time_offset,
+ Opt_err,
};
static const match_table_t fat_tokens = {
@@ -826,6 +831,7 @@ static const match_table_t fat_tokens = {
{Opt_immutable, "sys_immutable"},
{Opt_flush, "flush"},
{Opt_tz_utc, "tz=UTC"},
+ {Opt_time_offset, "time_offset=%d"},
{Opt_err_cont, "errors=continue"},
{Opt_err_panic, "errors=panic"},
{Opt_err_ro, "errors=remount-ro"},
@@ -910,7 +916,7 @@ static int parse_options(struct super_block *sb, char *options, int is_vfat,
opts->utf8 = opts->unicode_xlate = 0;
opts->numtail = 1;
opts->usefree = opts->nocase = 0;
- opts->tz_utc = 0;
+ opts->tz_set = 0;
opts->nfs = 0;
opts->errors = FAT_ERRORS_RO;
*debug = 0;
@@ -1006,8 +1012,17 @@ static int parse_options(struct super_block *sb, char *options, int is_vfat,
case Opt_flush:
opts->flush = 1;
break;
+ case Opt_time_offset:
+ if (match_int(&args[0], &option))
+ return 0;
+ if (option < -12 * 60 || option > 12 * 60)
+ return 0;
+ opts->tz_set = 1;
+ opts->time_offset = option;
+ break;
case Opt_tz_utc:
- opts->tz_utc = 1;
+ opts->tz_set = 1;
+ opts->time_offset = 0;
break;
case Opt_err_cont:
opts->errors = FAT_ERRORS_CONT;
diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index 6d93360ca0cc..5eb600dc43a9 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -212,8 +212,10 @@ void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
+ days_in_year[month] + day
+ DAYS_DELTA) * SECS_PER_DAY;
- if (!sbi->options.tz_utc)
+ if (!sbi->options.tz_set)
second += sys_tz.tz_minuteswest * SECS_PER_MIN;
+ else
+ second -= sbi->options.time_offset * SECS_PER_MIN;
if (time_cs) {
ts->tv_sec = second + (time_cs / 100);
@@ -229,8 +231,9 @@ void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts,
__le16 *time, __le16 *date, u8 *time_cs)
{
struct tm tm;
- time_to_tm(ts->tv_sec, sbi->options.tz_utc ? 0 :
- -sys_tz.tz_minuteswest * 60, &tm);
+ time_to_tm(ts->tv_sec,
+ (sbi->options.tz_set ? sbi->options.time_offset :
+ -sys_tz.tz_minuteswest) * SECS_PER_MIN, &tm);
/* FAT can only support year between 1980 to 2107 */
if (tm.tm_year < 1980 - 1900) {