fs/ntfs: use timespec64 directly for timestamp conversion

Now that the VFS has been converted from timespec to timespec64
timestamps, only the conversion to/from ntfs timestamps uses 32-bit
seconds.

This changes that last missing piece to get the ntfs implementation
y2038 safe on 32-bit architectures.

Link: http://lkml.kernel.org/r/20180718115017.742609-2-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Anton Altaparmakov <anton@tuxera.com>
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>

1 files changed, 15 insertions, 12 deletions

diff --git a/fs/ntfs/time.h b/fs/ntfs/time.h
index 01233989d5d1..24cd719f1fd2 100644
--- a/fs/ntfs/time.h
+++ b/fs/ntfs/time.h
@@ -36,16 +36,16 @@
  * Convert the Linux UTC time @ts to its corresponding NTFS time and return
  * that in little endian format.
  *
- * Linux stores time in a struct timespec consisting of a time_t (long at
- * present) tv_sec and a long tv_nsec where tv_sec is the number of 1-second
- * intervals since 1st January 1970, 00:00:00 UTC and tv_nsec is the number of
- * 1-nano-second intervals since the value of tv_sec.
+ * Linux stores time in a struct timespec64 consisting of a time64_t tv_sec
+ * and a long tv_nsec where tv_sec is the number of 1-second intervals since
+ * 1st January 1970, 00:00:00 UTC and tv_nsec is the number of 1-nano-second
+ * intervals since the value of tv_sec.
  *
  * NTFS uses Microsoft's standard time format which is stored in a s64 and is
  * measured as the number of 100-nano-second intervals since 1st January 1601,
  * 00:00:00 UTC.
  */
-static inline sle64 utc2ntfs(const struct timespec ts)
+static inline sle64 utc2ntfs(const struct timespec64 ts)
 {
 	/*
 	 * Convert the seconds to 100ns intervals, add the nano-seconds
@@ -63,7 +63,10 @@ static inline sle64 utc2ntfs(const struct timespec ts)
  */
 static inline sle64 get_current_ntfs_time(void)
 {
-	return utc2ntfs(current_kernel_time());
+	struct timespec64 ts;
+
+	ktime_get_coarse_real_ts64(&ts);
+	return utc2ntfs(ts);
 }
 
 /**
@@ -73,18 +76,18 @@ static inline sle64 get_current_ntfs_time(void)
  * Convert the little endian NTFS time @time to its corresponding Linux UTC
  * time and return that in cpu format.
  *
- * Linux stores time in a struct timespec consisting of a time_t (long at
- * present) tv_sec and a long tv_nsec where tv_sec is the number of 1-second
- * intervals since 1st January 1970, 00:00:00 UTC and tv_nsec is the number of
- * 1-nano-second intervals since the value of tv_sec.
+ * Linux stores time in a struct timespec64 consisting of a time64_t tv_sec
+ * and a long tv_nsec where tv_sec is the number of 1-second intervals since
+ * 1st January 1970, 00:00:00 UTC and tv_nsec is the number of 1-nano-second
+ * intervals since the value of tv_sec.
  *
  * NTFS uses Microsoft's standard time format which is stored in a s64 and is
  * measured as the number of 100 nano-second intervals since 1st January 1601,
  * 00:00:00 UTC.
  */
-static inline struct timespec ntfs2utc(const sle64 time)
+static inline struct timespec64 ntfs2utc(const sle64 time)
 {
-	struct timespec ts;
+	struct timespec64 ts;
 
 	/* Subtract the NTFS time offset. */
 	u64 t = (u64)(sle64_to_cpu(time) - NTFS_TIME_OFFSET);