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authorJoe Peterson <joe@skyrush.com>2008-07-25 04:46:47 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 13:53:34 -0400
commitb271e067c896ad4082b15e96077675d08db40625 (patch)
tree1837d1c988226116e277c4f71b7f57aed5a7df05 /fs/fat/dir.c
parente8938a62a85d1f487e02c3b01955b47c9598f6d2 (diff)
fatfs: add UTC timestamp option
Provide a new mount option ("tz=UTC") for DOS (vfat/msdos) filesystems, allowing timestamps to be in coordinated universal time (UTC) rather than local time in applications where doing this is advantageous. In particular, portable devices that use fat/vfat (such as digital cameras) can benefit from using UTC in their internal clocks, thus avoiding daylight saving time errors and general time ambiguity issues. The user of the device does not have to worry about changing the time when moving from place or when daylight saving changes. The new mount option, when set, disables the counter-adjustment that Linux currently makes to FAT timestamp info in anticipation of the normal userspace time zone correction. When used in this new mode, all daylight saving time and time zone handling is done in userspace as is normal for many other filesystems (like ext3). The default mode, which remains unchanged, is still appropriate when mounting volumes written in Windows (because of its use of local time). I originally based this patch on one submitted last year by Paul Collins, but I updated it to work with current source and changed variable/option naming. Ogawa Hirofumi (who maintains these filesystems) and I discussed this patch at length on lkml, and he suggested using the option name in the attached version of the patch. Barry Bouwsma pointed out a good addition to the patch as well. Signed-off-by: Joe Peterson <joe@skyrush.com> Signed-off-by: Paul Collins <paul@ondioline.org> Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Barry Bouwsma <free_beer_for_all@yahoo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fat/dir.c')
-rw-r--r--fs/fat/dir.c2
1 files changed, 1 insertions, 1 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)
1101 goto error_free; 1101 goto error_free;
1102 } 1102 }
1103 1103
1104 fat_date_unix2dos(ts->tv_sec, &time, &date); 1104 fat_date_unix2dos(ts->tv_sec, &time, &date, sbi->options.tz_utc);
1105 1105
1106 de = (struct msdos_dir_entry *)bhs[0]->b_data; 1106 de = (struct msdos_dir_entry *)bhs[0]->b_data;
1107 /* filling the new directory slots ("." and ".." entries) */ 1107 /* filling the new directory slots ("." and ".." entries) */