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Joe Peterson b271e067c8 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>
2008-07-25 10:53:34 -07:00
..
9p 9p: fix O_APPEND in legacy mode 2008-07-03 09:59:03 -05:00
adfs fs: replace remaining __FUNCTION__ occurrences 2008-04-30 08:29:54 -07:00
affs [PATCH] fix reservation discarding in affs 2008-05-06 13:45:33 -04:00
afs Fix various old email addresses for dwmw2 2008-06-06 11:29:10 -07:00
autofs
autofs4 autofs4: remove unused ioctls 2008-07-24 10:47:33 -07:00
befs byteorder: don't directly include linux/byteorder/generic.h 2008-05-16 12:01:45 -07:00
bfs fs: replace remaining __FUNCTION__ occurrences 2008-04-30 08:29:54 -07:00
cifs Merge commit 'v2.6.26' into bkl-removal 2008-07-14 15:29:34 -06:00
coda coda: remove CODA_FS_OLD_API 2008-07-25 10:53:33 -07:00
configfs configfs: Allow ->make_item() and ->make_group() to return detailed errors. 2008-07-17 15:21:29 -07:00
cramfs fs: Remove unnecessary inclusions of asm/semaphore.h 2008-04-18 22:16:44 -04:00
debugfs debugfs: Implement debugfs_remove_recursive() 2008-07-21 21:54:59 -07:00
devpts devpts: factor out PTY index allocation 2008-04-30 08:29:48 -07:00
dlm configfs: Allow ->make_item() and ->make_group() to return detailed errors. 2008-07-17 15:21:29 -07:00
ecryptfs eCryptfs: Make all persistent file opens delayed 2008-07-24 10:47:31 -07:00
efs
exportfs fs: replace remaining __FUNCTION__ occurrences 2008-04-30 08:29:54 -07:00
ext2 ext2: remove double definitions of xattr macros 2008-07-25 10:53:31 -07:00
ext3 ext3: validate directory entry data before use 2008-07-25 10:53:33 -07:00
ext4 ext4: do not set extents feature from the kernel 2008-07-11 19:27:31 -04:00
fat fatfs: add UTC timestamp option 2008-07-25 10:53:34 -07:00
freevxfs fs/freevxfs/: proper externs 2008-04-29 08:06:00 -07:00
fuse fuse: fix thinko in max I/O size calucation 2008-06-17 18:08:10 -07:00
gfs2 Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw 2008-07-15 10:38:46 -07:00
hfs hfs: convert extents_lock in a mutex 2008-07-25 10:53:33 -07:00
hfsplus hfsplus: convert the extents_lock in a mutex 2008-07-25 10:53:33 -07:00
hostfs
hpfs
hppfs fix hppfs Makefile breakage 2008-05-21 16:55:58 -07:00
hugetlbfs hugetlbfs: per mount huge page sizes 2008-07-24 10:47:17 -07:00
isofs isofs: fix minor filesystem corruption 2008-07-25 10:53:33 -07:00
jbd jbd: don't abort if flushing file data failed 2008-07-25 10:53:32 -07:00
jbd2 ext4: Add ordered mode support for delalloc 2008-07-11 19:27:31 -04:00
jffs2 Merge git://git.infradead.org/mtd-2.6 2008-05-01 11:15:28 -07:00
jfs jfs: remove DIRENTSIZ 2008-06-10 15:12:58 -05:00
lockd Merge branch 'for-2.6.27' of git://linux-nfs.org/~bfields/linux 2008-07-20 21:21:46 -07:00
minix minix: remove !NO_TRUNCATE code 2008-07-25 10:53:30 -07:00
msdos fatfs: add UTC timestamp option 2008-07-25 10:53:34 -07:00
ncpfs Remove BKL from remote_llseek v2 2008-07-02 15:06:27 -06:00
nfs fix fs/nfs/nfsroot.c compilation 2008-07-24 17:32:41 -07:00
nfs_common
nfsd Merge branch 'for-2.6.27' of git://linux-nfs.org/~bfields/linux 2008-07-20 21:21:46 -07:00
nls
ntfs ntfs: le*_add_cpu conversion 2008-05-24 09:56:08 -07:00
ocfs2 configfs: Allow ->make_item() and ->make_group() to return detailed errors. 2008-07-17 15:21:29 -07:00
openpromfs
partitions fs: ldm.[ch] use get_unaligned_* helpers 2008-07-25 10:53:26 -07:00
proc vmallocinfo: add NUMA information 2008-07-24 10:47:17 -07:00
qnx4
ramfs ramfs: enable splice write 2008-07-04 09:52:14 +02:00
reiserfs reiserfs: remove double definitions of xattr macros 2008-07-25 10:53:33 -07:00
romfs
smbfs remove unused #include <linux/dirent.h>'s 2008-07-25 10:53:34 -07:00
sysfs driver core: Suppress sysfs warnings for device_rename(). 2008-07-21 21:55:01 -07:00
sysv sysv: [bl]e*_add_cpu conversion 2008-04-30 08:29:52 -07:00
ubifs UBIFS: include to compilation 2008-07-15 17:35:24 +03:00
udf udf: Fix regression in UDF anchor block detection 2008-06-24 11:38:03 +02:00
ufs UFS: add const to parser token table 2008-07-24 11:50:15 -07:00
vfat fatfs: add UTC timestamp option 2008-07-25 10:53:34 -07:00
xfs Fix reference counting race on log buffers 2008-07-11 11:37:18 -07:00
aio.c uml: activate_mm: remove the dead PF_BORROWED_MM check 2008-06-06 11:36:22 -07:00
anon_inodes.c flag parameters: NONBLOCK in anon_inode_getfd 2008-07-24 10:47:28 -07:00
attr.c
bad_inode.c
binfmt_aout.c fs/binfmt_aout.c: use printk_ratelimit() 2008-04-29 08:06:04 -07:00
binfmt_elf_fdpic.c nommu: fix ksize() abuse 2008-06-06 11:29:13 -07:00
binfmt_elf.c execve filename: document and export via auxiliary vector 2008-07-22 09:59:40 -07:00
binfmt_em86.c binfmt_misc.c: avoid potential kernel stack overflow 2008-04-29 08:06:04 -07:00
binfmt_flat.c nommu: fix ksize() abuse 2008-06-06 11:29:13 -07:00
binfmt_misc.c binfmt_misc: use simple_read_from_buffer() 2008-07-24 10:47:27 -07:00
binfmt_script.c binfmt_misc.c: avoid potential kernel stack overflow 2008-04-29 08:06:04 -07:00
binfmt_som.c [PATCH] sanitize handling of shared descriptor tables in failing execve() 2008-04-25 09:23:53 -04:00
bio-integrity.c block: integrity checkpatch cleanups 2008-07-03 13:21:13 +02:00
bio.c Add bvec_merge_data to handle stacked devices and ->merge_bvec() 2008-07-03 13:21:15 +02:00
block_dev.c [PATCH] fix cgroup-inflicted breakage in block_dev.c 2008-06-23 08:30:55 -04:00
buffer.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
char_dev.c Remove the lock_kernel() call from chrdev_open() 2008-06-20 14:05:53 -06:00
compat_binfmt_elf.c
compat_ioctl.c remove unused #include <linux/dirent.h>'s 2008-07-25 10:53:34 -07:00
compat.c flag parameters: signalfd 2008-07-24 10:47:27 -07:00
dcache.c fix soft lock up at NFS mount via per-SB LRU-list of unused dentries 2008-07-24 10:47:15 -07:00
dcookies.c
direct-io.c
dnotify.c [PATCH] split linux/file.h 2008-05-01 13:08:16 -04:00
dquot.c quota: don't call sync_fs() from vfs_quota_off() when there's no quota turn off 2008-05-13 08:02:23 -07:00
drop_caches.c vfs: skip inodes without pages to free in drop_pagecache_sb() 2008-04-29 08:06:05 -07:00
eventfd.c flag parameters: check magic constants 2008-07-24 10:47:29 -07:00
eventpoll.c flag parameters add-on: remove epoll_create size param 2008-07-24 10:47:29 -07:00
exec.c exec: remove some includes 2008-07-25 10:53:28 -07:00
fcntl.c flag parameters: dup2 2008-07-24 10:47:28 -07:00
fifo.c
file_table.c [PATCH] split linux/file.h 2008-05-01 13:08:16 -04:00
file.c [PATCH] avoid multiplication overflows and signedness issues for max_fds 2008-05-16 17:22:52 -04:00
filesystems.c
fs-writeback.c VFS: export sync_sb_inodes 2008-07-14 19:10:52 +03:00
generic_acl.c
inode.c VFS: fix unused variable warning 2008-05-06 13:13:37 -07:00
inotify_user.c flag parameters: check magic constants 2008-07-24 10:47:29 -07:00
inotify.c
internal.h [PATCH] move a bunch of declarations to fs/internal.h 2008-04-21 23:11:01 -04:00
ioctl.c make vfs_ioctl() static 2008-04-29 08:06:00 -07:00
ioprio.c
Kconfig coda: remove CODA_FS_OLD_API 2008-07-25 10:53:33 -07:00
Kconfig.binfmt frv: don't offer BINFMT_FLAT 2008-06-06 11:29:08 -07:00
libfs.c add kernel-doc for simple_read_from_buffer and memory_read_from_buffer 2008-07-04 10:40:07 -07:00
locks.c [patch 4/4] flock: remove unused fields from file_lock_operations 2008-06-23 11:52:30 -04:00
Makefile Merge branch 'for_linus' of git://git.infradead.org/~dedekind/ubifs-2.6 2008-07-16 15:02:57 -07:00
mbcache.c
mpage.c vfs: add hooks for ext4's delayed allocation support 2008-07-11 19:27:31 -04:00
namei.c [patch 3/4] vfs: fix ERR_PTR abuse in generic_readlink 2008-06-23 11:52:30 -04:00
namespace.c LSM/SELinux: show LSM mount options in /proc/mounts 2008-07-14 15:02:05 +10:00
nfsctl.c
no-block.c
open.c fs: check for statfs overflow 2008-07-24 10:47:19 -07:00
pipe.c flag parameters: NONBLOCK in pipe 2008-07-24 10:47:29 -07:00
pnode.c [patch 7/7] vfs: mountinfo: show dominating group id 2008-04-23 00:05:09 -04:00
pnode.h [patch 7/7] vfs: mountinfo: show dominating group id 2008-04-23 00:05:09 -04:00
posix_acl.c
quota_v1.c quota: do not allow setting of quota limits to too high values 2008-04-28 08:58:32 -07:00
quota_v2.c quota: le*_add_cpu conversion 2008-04-30 08:29:51 -07:00
quota.c quota: quota core changes for quotaon on remount 2008-04-28 08:58:33 -07:00
read_write.c Remove BKL from remote_llseek v2 2008-07-02 15:06:27 -06:00
read_write.h
readdir.c
select.c Fix performance regression on lmbench select benchmark 2008-06-22 12:23:15 -07:00
seq_file.c [patch 2/7] vfs: mountinfo: add seq_file_root() 2008-04-23 00:04:38 -04:00
signalfd.c flag parameters: check magic constants 2008-07-24 10:47:29 -07:00
splice.c splice: fix generic_file_splice_read() race with page invalidation 2008-07-04 09:52:14 +02:00
stack.c
stat.c
super.c fix soft lock up at NFS mount via per-SB LRU-list of unused dentries 2008-07-24 10:47:15 -07:00
sync.c SYNC_FILE_RANGE_WRITE may and will block. Document that. 2008-07-24 10:47:17 -07:00
timerfd.c flag parameters: check magic constants 2008-07-24 10:47:29 -07:00
utimes.c [patch for 2.6.26 4/4] vfs: utimensat(): fix write access check for futimens() 2008-06-23 08:43:52 -04:00
xattr_acl.c
xattr.c xattr: add missing consts to function arguments 2008-04-29 08:06:06 -07:00