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authorArnd Bergmann <arnd@arndb.de>2018-08-17 15:43:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-17 16:20:27 -0700
commitf08957d0ffe91f346c47cef95139c54aa7275cfe (patch)
tree16d260a7e3354f56e00d1227be8aabac84f97ef0 /fs/hpfs/hpfs_fn.h
parentbcf451ecfc8d45618d13c9e4abcbbd770af20cc9 (diff)
fs/hpfs: extend gmt_to_local() conversion to 64-bit times
The VFS timestamps are all 64-bit now, the only missing piece for hpfs is the internal conversion function. One interesting bit about hpfs is that it can already deal with moving the 136 year window of its timestamps to support a much wider range than other file systems with 32-bit timestamps. It also treats the timestamps as 'unsigned' on 64-bit architectures (but signed on 32-bit, because time_t always around to negative numbers in 2038). Changing the conversion to use time64_t makes 32-bit architectures behave the same way as 64-bit. For completeness, this also adds a clamp_t call for each conversion, so we don't wrap the timestamps but instead stay within the [0..U32_MAX] range of the on-disk timestamps. Link: http://lkml.kernel.org/r/20180718115017.742609-3-arnd@arndb.de Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/hpfs/hpfs_fn.h')
-rw-r--r--fs/hpfs/hpfs_fn.h13
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/hpfs/hpfs_fn.h b/fs/hpfs/hpfs_fn.h
index 2a153aed4c19..ab2e7cc2ff33 100644
--- a/fs/hpfs/hpfs_fn.h
+++ b/fs/hpfs/hpfs_fn.h
@@ -334,16 +334,23 @@ long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg);
* local time (HPFS) to GMT (Unix)
*/
-static inline time_t local_to_gmt(struct super_block *s, time32_t t)
+static inline time64_t local_to_gmt(struct super_block *s, time32_t t)
{
extern struct timezone sys_tz;
return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
}
-static inline time32_t gmt_to_local(struct super_block *s, time_t t)
+static inline time32_t gmt_to_local(struct super_block *s, time64_t t)
{
extern struct timezone sys_tz;
- return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
+ t = t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
+
+ return clamp_t(time64_t, t, 0, U32_MAX);
+}
+
+static inline time32_t local_get_seconds(struct super_block *s)
+{
+ return gmt_to_local(s, ktime_get_real_seconds());
}
/*