6 files changed, 35 insertions, 17 deletions

diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index 4c35477bc94c..cd4a0162e10d 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -1101,7 +1101,7 @@ int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
                 goto error_free;
         }
 
-        fat_date_unix2dos(ts->tv_sec, &time, &date);
+        fat_date_unix2dos(ts->tv_sec, &time, &date, sbi->options.tz_utc);
 
         de = (struct msdos_dir_entry *)bhs[0]->b_data;
         /* filling the new directory slots ("." and ".." entries) */
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 60deb5fd1188..23676f9d79ce 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -382,17 +382,20 @@ static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
         inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
                            & ~((loff_t)sbi->cluster_size - 1)) >> 9;
         inode->i_mtime.tv_sec =
-                date_dos2unix(le16_to_cpu(de->time), le16_to_cpu(de->date));
+                date_dos2unix(le16_to_cpu(de->time), le16_to_cpu(de->date),
+                              sbi->options.tz_utc);
         inode->i_mtime.tv_nsec = 0;
         if (sbi->options.isvfat) {
                 int secs = de->ctime_cs / 100;
                 int csecs = de->ctime_cs % 100;
                 inode->i_ctime.tv_sec  =
                         date_dos2unix(le16_to_cpu(de->ctime),
-                                      le16_to_cpu(de->cdate)) + secs;
+                                      le16_to_cpu(de->cdate),
+                                      sbi->options.tz_utc) + secs;
                 inode->i_ctime.tv_nsec = csecs * 10000000;
                 inode->i_atime.tv_sec =
-                        date_dos2unix(0, le16_to_cpu(de->adate));
+                        date_dos2unix(0, le16_to_cpu(de->adate),
+                                      sbi->options.tz_utc);
                 inode->i_atime.tv_nsec = 0;
         } else
                 inode->i_ctime = inode->i_atime = inode->i_mtime;
@@ -591,11 +594,14 @@ retry:
         raw_entry->attr = fat_attr(inode);
         raw_entry->start = cpu_to_le16(MSDOS_I(inode)->i_logstart);
         raw_entry->starthi = cpu_to_le16(MSDOS_I(inode)->i_logstart >> 16);
-        fat_date_unix2dos(inode->i_mtime.tv_sec, &raw_entry->time, &raw_entry->date);
+        fat_date_unix2dos(inode->i_mtime.tv_sec, &raw_entry->time,
+                          &raw_entry->date, sbi->options.tz_utc);
         if (sbi->options.isvfat) {
                 __le16 atime;
-                fat_date_unix2dos(inode->i_ctime.tv_sec,&raw_entry->ctime,&raw_entry->cdate);
-                fat_date_unix2dos(inode->i_atime.tv_sec,&atime,&raw_entry->adate);
+                fat_date_unix2dos(inode->i_ctime.tv_sec, &raw_entry->ctime,
+                                  &raw_entry->cdate, sbi->options.tz_utc);
+                fat_date_unix2dos(inode->i_atime.tv_sec, &atime,
+                                  &raw_entry->adate, sbi->options.tz_utc);
                 raw_entry->ctime_cs = (inode->i_ctime.tv_sec & 1) * 100 +
                         inode->i_ctime.tv_nsec / 10000000;
         }
@@ -836,6 +842,8 @@ static int fat_show_options(struct seq_file *m, struct vfsmount *mnt)
         }
         if (sbi->options.flush)
                 seq_puts(m, ",flush");
+        if (opts->tz_utc)
+                seq_puts(m, ",tz=UTC");
 
         return 0;
 }
@@ -848,7 +856,7 @@ enum {
         Opt_charset, Opt_shortname_lower, Opt_shortname_win95,
         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_obsolate, Opt_flush, Opt_err,
+        Opt_obsolate, Opt_flush, Opt_tz_utc, Opt_err,
 };
 
 static match_table_t fat_tokens = {
@@ -883,6 +891,7 @@ static match_table_t fat_tokens = {
         {Opt_obsolate, "cvf_options=%100s"},
         {Opt_obsolate, "posix"},
         {Opt_flush, "flush"},
+        {Opt_tz_utc, "tz=UTC"},
         {Opt_err, NULL},
 };
 static match_table_t msdos_tokens = {
@@ -947,6 +956,7 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
         opts->utf8 = opts->unicode_xlate = 0;
         opts->numtail = 1;
         opts->usefree = opts->nocase = 0;
+        opts->tz_utc = 0;
         *debug = 0;
 
         if (!options)
@@ -1036,6 +1046,9 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
                 case Opt_flush:
                         opts->flush = 1;
                         break;
+                case Opt_tz_utc:
+                        opts->tz_utc = 1;
+                        break;
 
                 /* msdos specific */
                 case Opt_dots:
diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index 61f23511eacf..79fb98ad36d4 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -142,7 +142,7 @@ static int day_n[] = {
 };
 
 /* Convert a MS-DOS time/date pair to a UNIX date (seconds since 1 1 70). */
-int date_dos2unix(unsigned short time, unsigned short date)
+int date_dos2unix(unsigned short time, unsigned short date, int tz_utc)
 {
         int month, year, secs;
 
@@ -156,16 +156,18 @@ int date_dos2unix(unsigned short time, unsigned short date)
             ((date & 31)-1+day_n[month]+(year/4)+year*365-((year & 3) == 0 &&
             month < 2 ? 1 : 0)+3653);
                         /* days since 1.1.70 plus 80's leap day */
-        secs += sys_tz.tz_minuteswest*60;
+        if (!tz_utc)
+                secs += sys_tz.tz_minuteswest*60;
         return secs;
 }
 
 /* Convert linear UNIX date to a MS-DOS time/date pair. */
-void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date)
+void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date, int tz_utc)
 {
         int day, year, nl_day, month;
 
-        unix_date -= sys_tz.tz_minuteswest*60;
+        if (!tz_utc)
+                unix_date -= sys_tz.tz_minuteswest*60;
 
         /* Jan 1 GMT 00:00:00 1980. But what about another time zone? */
         if (unix_date < 315532800)
diff --git a/fs/msdos/namei.c b/fs/msdos/namei.c
index e4ad6c6b753e..e844b9809d27 100644
--- a/fs/msdos/namei.c
+++ b/fs/msdos/namei.c
@@ -237,6 +237,7 @@ static int msdos_add_entry(struct inode *dir, const unsigned char *name,
                            int is_dir, int is_hid, int cluster,
                            struct timespec *ts, struct fat_slot_info *sinfo)
 {
+        struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
         struct msdos_dir_entry de;
         __le16 time, date;
         int err;
@@ -246,7 +247,7 @@ static int msdos_add_entry(struct inode *dir, const unsigned char *name,
         if (is_hid)
                 de.attr |= ATTR_HIDDEN;
         de.lcase = 0;
-        fat_date_unix2dos(ts->tv_sec, &time, &date);
+        fat_date_unix2dos(ts->tv_sec, &time, &date, sbi->options.tz_utc);
         de.cdate = de.adate = 0;
         de.ctime = 0;
         de.ctime_cs = 0;
diff --git a/fs/vfat/namei.c b/fs/vfat/namei.c
index b546ba69be82..155c10b4adbd 100644
--- a/fs/vfat/namei.c
+++ b/fs/vfat/namei.c
@@ -621,7 +621,7 @@ shortname:
         memcpy(de->name, msdos_name, MSDOS_NAME);
         de->attr = is_dir ? ATTR_DIR : ATTR_ARCH;
         de->lcase = lcase;
-        fat_date_unix2dos(ts->tv_sec, &time, &date);
+        fat_date_unix2dos(ts->tv_sec, &time, &date, sbi->options.tz_utc);
         de->time = de->ctime = time;
         de->date = de->cdate = de->adate = date;
         de->ctime_cs = 0;
diff --git a/include/linux/msdos_fs.h b/include/linux/msdos_fs.h
index 3346c9c8f17a..ba63858056c7 100644
--- a/include/linux/msdos_fs.h
+++ b/include/linux/msdos_fs.h
@@ -203,7 +203,8 @@ struct fat_mount_options {
                  numtail:1,       /* Does first alias have a numeric '~1' type tail? */
                  flush:1,         /* write things quickly */
                  nocase:1,        /* Does this need case conversion? 0=need case conversion*/
-                 usefree:1;       /* Use free_clusters for FAT32 */
+                 usefree:1,       /* Use free_clusters for FAT32 */
+                 tz_utc:1;        /* Filesystem timestamps are in UTC */
 };
 
 #define FAT_HASH_BITS   8
@@ -434,8 +435,9 @@ extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
 extern void fat_fs_panic(struct super_block *s, const char *fmt, ...);
 extern void fat_clusters_flush(struct super_block *sb);
 extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
-extern int date_dos2unix(unsigned short time, unsigned short date);
-extern void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date);
+extern int date_dos2unix(unsigned short time, unsigned short date, int tz_utc);
+extern void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date,
+                              int tz_utc);
 extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);
 
 int fat_cache_init(void);