NTFS: - Modify fs/ntfs/time.c::ntfs2utc(), get_current_ntfs_time(), and

        utc2ntfs() to work with struct timespec instead of time_t on the
        Linux UTC time side thus preserving the full precision of the NTFS
        time and only loosing up to 99 nano-seconds in the Linux UTC time.
      - Move fs/ntfs/time.c to fs/ntfs/time.h and make the time functions
        static inline.

fs/ntfs/ChangeLog

@@ -22,6 +22,12 @@ ToDo:
 2.1.8 - WIP.
 
 	- Use get_bh() instead of manual atomic_inc() in fs/ntfs/compress.c.
+	- Modify fs/ntfs/time.c::ntfs2utc(), get_current_ntfs_time(), and
+	  utc2ntfs() to work with struct timespec instead of time_t on the
+	  Linux UTC time side thus preserving the full precision of the NTFS
+	  time and only loosing up to 99 nano-seconds in the Linux UTC time.
+	- Move fs/ntfs/time.c to fs/ntfs/time.h and make the time functions
+	  static inline.
 
 2.1.7 - Enable NFS exporting of mounted NTFS volumes.
 

fs/ntfs/Makefile

@@ -3,7 +3,7 @@
 obj-$(CONFIG_NTFS_FS) += ntfs.o
 
 ntfs-objs := aops.o attrib.o compress.o debug.o dir.o file.o inode.o mft.o \
-	     mst.o namei.o super.o sysctl.o time.o unistr.o upcase.o
+	     mst.o namei.o super.o sysctl.o unistr.o upcase.o
 
 EXTRA_CFLAGS = -DNTFS_VERSION=\"2.1.8-WIP\"
 

fs/ntfs/inode.c

@@ -29,6 +29,7 @@
 #include "dir.h"
 #include "inode.h"
 #include "attrib.h"
+#include "time.h"
 
 /**
  * ntfs_attr - ntfs in memory attribute structure
@@ -590,21 +591,18 @@ static int ntfs_read_locked_inode(struct inode *vi)
 	 * mtime is the last change of the data within the file. Not changed
 	 * when only metadata is changed, e.g. a rename doesn't affect mtime.
 	 */
-	vi->i_mtime.tv_sec = ntfs2utc(si->last_data_change_time);
-	vi->i_mtime.tv_nsec = 0;
+	vi->i_mtime = ntfs2utc(si->last_data_change_time);
 	/*
 	 * ctime is the last change of the metadata of the file. This obviously
 	 * always changes, when mtime is changed. ctime can be changed on its
 	 * own, mtime is then not changed, e.g. when a file is renamed.
 	 */
-	vi->i_ctime.tv_sec = ntfs2utc(si->last_mft_change_time);
-	vi->i_ctime.tv_nsec = 0;
+	vi->i_ctime = ntfs2utc(si->last_mft_change_time);
 	/*
 	 * Last access to the data within the file. Not changed during a rename
 	 * for example but changed whenever the file is written to.
 	 */
-	vi->i_atime.tv_sec = ntfs2utc(si->last_access_time);
-	vi->i_atime.tv_nsec = 0;
+	vi->i_atime = ntfs2utc(si->last_access_time);
 
 	/* Find the attribute list attribute if present. */
 	reinit_attr_search_ctx(ctx);
@@ -2029,4 +2027,3 @@ int ntfs_setattr(struct dentry *dentry, struct iattr *attr)
 }
 
 #endif
-

fs/ntfs/ntfs.h

@@ -2,7 +2,7 @@
  * ntfs.h - Defines for NTFS Linux kernel driver. Part of the Linux-NTFS
  *	    project.
  *
- * Copyright (c) 2001,2002 Anton Altaparmakov.
+ * Copyright (c) 2001-2004 Anton Altaparmakov.
  * Copyright (C) 2002 Richard Russon.
  *
  * This program/include file is free software; you can redistribute it and/or
@@ -180,11 +180,6 @@ extern int post_read_mst_fixup(NTFS_RECORD *b, const u32 size);
 extern int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size);
 extern void post_write_mst_fixup(NTFS_RECORD *b);
 
-/* From fs/ntfs/time.c */
-extern inline s64 utc2ntfs(const time_t time);
-extern inline s64 get_current_ntfs_time(void);
-extern time_t ntfs2utc(const s64 time);
-
 /* From fs/ntfs/unistr.c */
 extern BOOL ntfs_are_names_equal(const uchar_t *s1, size_t s1_len,
 		const uchar_t *s2, size_t s2_len,

fs/ntfs/time.c → fs/ntfs/time.h

 /*
- * time.c - NTFS time conversion functions. Part of the Linux-NTFS project.
+ * time.h - NTFS time conversion functions.  Part of the Linux-NTFS project.
  *
- * Copyright (c) 2001 Anton Altaparmakov.
+ * Copyright (c) 2001-2004 Anton Altaparmakov.
  *
  * This program/include file is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as published
@@ -19,31 +19,40 @@
  * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#include <linux/sched.h>	/* For CURRENT_TIME. */
+#ifndef _LINUX_NTFS_TIME_H
+#define _LINUX_NTFS_TIME_H
+
+#include <linux/time.h>		/* For current_kernel_time(). */
 #include <asm/div64.h>		/* For do_div(). */
 
-#include "ntfs.h"
+#include "endian.h"
 
 #define NTFS_TIME_OFFSET ((s64)(369 * 365 + 89) * 24 * 3600 * 10000000)
 
 /**
- * utc2ntfs - convert Linux time to NTFS time
- * @time:		Linux time to convert to NTFS
+ * utc2ntfs - convert Linux UTC time to NTFS time
+ * @ts:		Linux UTC time to convert to NTFS time
  *
- * Convert the Linux time @time to its corresponding NTFS time and return that
- * in little endian format.
+ * Convert the Linux UTC time @ts to its corresponding NTFS time and return
+ * that in little endian format.
  *
- * Linux stores time in a long at present and measures it as the number of
- * 1-second intervals since 1st January 1970, 00:00:00 UTC.
+ * 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.
  *
  * 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,
+ * measured as the number of 100-nano-second intervals since 1st January 1601,
  * 00:00:00 UTC.
  */
-inline s64 utc2ntfs(const time_t time)
+static inline s64 utc2ntfs(const struct timespec ts)
 {
-	/* Convert to 100ns intervals and then add the NTFS time offset. */
-	return cpu_to_sle64((s64)time * 10000000 + NTFS_TIME_OFFSET);
+	/*
+	 * Convert the seconds to 100ns intervals, add the nano-seconds
+	 * converted to 100ns intervals, and then add the NTFS time offset.
+	 */
+	return cpu_to_sle64((s64)ts.tv_sec * 10000000 + ts.tv_nsec / 100 +
+			NTFS_TIME_OFFSET);
 }
 
 /**
@@ -52,31 +61,40 @@ inline s64 utc2ntfs(const time_t time)
  * Get the current time from the Linux kernel, convert it to its corresponding
  * NTFS time and return that in little endian format.
  */
-inline s64 get_current_ntfs_time(void)
+static inline s64 get_current_ntfs_time(void)
 {
-	/* ignores leap second */
-	return utc2ntfs(get_seconds()) + xtime.tv_nsec/1000;
+	return utc2ntfs(current_kernel_time());
 }
 
 /**
  * ntfs2utc - convert NTFS time to Linux time
- * @time:		NTFS time (little endian) to convert to Linux
+ * @time:	NTFS time (little endian) to convert to Linux UTC
  *
- * Convert the little endian NTFS time @time to its corresponding Linux time
- * and return that in cpu format.
+ * Convert the little endian NTFS time @time to its corresponding Linux UTC
+ * time and return that in cpu format.
  *
- * Linux stores time in a long at present and measures it as the number of
- * 1-second intervals since 1st January 1970, 00:00:00 UTC.
+ * 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.
  *
  * 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.
  */
-inline time_t ntfs2utc(const s64 time)
+static inline struct timespec ntfs2utc(const s64 time)
 {
-	/* Subtract the NTFS time offset, then convert to 1s intervals. */
+	struct timespec ts;
+
+	/* Subtract the NTFS time offset. */
 	s64 t = sle64_to_cpu(time) - NTFS_TIME_OFFSET;
-	do_div(t, 10000000);
-	return (time_t)t;
+	/*
+	 * Convert the time to 1-second intervals and the remainder to
+	 * 1-nano-second intervals.
+	 */
+	ts.tv_nsec = do_div(t, 10000000) * 100;
+	ts.tv_sec = t;
+	return ts;
 }
 
+#endif /* _LINUX_NTFS_TIME_H */