[RFC 13/15] kernel: time: change inode_timespec to timespec64

[Deepa Dinamani]

Substitute inode_timespec aliases with timespec64.
Since CONFIG_FS_USES_64BIT_TIME is enabled, internally
all inode_timespec references are using timespec64
already.

Signed-off-by: Deepa Dinamani <deepa.kernel@xxxxxxxxx>

Conflicts:
	kernel/time/time.c

Conflicts:
	kernel/time/time.c
---
 kernel/time/time.c | 130 +++++++++++++++++++++++++++++++----------------------
 1 file changed, 76 insertions(+), 54 deletions(-)

diff --git a/kernel/time/time.c b/kernel/time/time.c
index 24ca258..87d9a4c 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -230,6 +230,76 @@ SYSCALL_DEFINE1(adjtimex, struct timex __user *, txc_p)
 	return copy_to_user(txc_p, &txc, sizeof(struct timex)) ? -EFAULT : ret;
 }
 
+<<<<<<< HEAD
+=======
+/**
+ * current_fs_time - Return FS time
+ * @sb: Superblock.
+ *
+ * Return the current time truncated to the time granularity supported by
+ * the fs.
+ */
+struct timespec64 current_fs_time(struct super_block *sb)
+{
+	struct timespec64 now = current_kernel_time64();
+
+	return fs_time_trunc(now, sb);
+}
+EXPORT_SYMBOL(current_fs_time);
+
+struct timespec64 current_fs_time_sec(struct super_block *sb)
+{
+	struct timespec64 ts = {ktime_get_real_seconds(), 0};
+
+	/* range check for time. */
+	fs_time_range_check(sb, &ts);
+
+	return ts;
+}
+EXPORT_SYMBOL(current_fs_time_sec);
+
+/*
+ * Convert jiffies to milliseconds and back.
+ *
+ * Avoid unnecessary multiplications/divisions in the
+ * two most common HZ cases:
+ */
+unsigned int jiffies_to_msecs(const unsigned long j)
+{
+#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
+	return (MSEC_PER_SEC / HZ) * j;
+#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
+	return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);
+#else
+# if BITS_PER_LONG == 32
+	return (HZ_TO_MSEC_MUL32 * j) >> HZ_TO_MSEC_SHR32;
+# else
+	return (j * HZ_TO_MSEC_NUM) / HZ_TO_MSEC_DEN;
+# endif
+#endif
+}
+EXPORT_SYMBOL(jiffies_to_msecs);
+
+unsigned int jiffies_to_usecs(const unsigned long j)
+{
+	/*
+	 * Hz usually doesn't go much further MSEC_PER_SEC.
+	 * jiffies_to_usecs() and usecs_to_jiffies() depend on that.
+	 */
+	BUILD_BUG_ON(HZ > USEC_PER_SEC);
+
+#if !(USEC_PER_SEC % HZ)
+	return (USEC_PER_SEC / HZ) * j;
+#else
+# if BITS_PER_LONG == 32
+	return (HZ_TO_USEC_MUL32 * j) >> HZ_TO_USEC_SHR32;
+# else
+	return (j * HZ_TO_USEC_NUM) / HZ_TO_USEC_DEN;
+# endif
+#endif
+}
+EXPORT_SYMBOL(jiffies_to_usecs);
+
 /* fs_time_range_check:
  * Function to check if a given timestamp is in the range allowed for a
  * filesystem.
@@ -240,7 +310,7 @@ SYSCALL_DEFINE1(adjtimex, struct timex __user *, txc_p)
  * nsec is set to 0 if not in allowed range.
  */
 static void
-fs_time_range_check(struct super_block *sb, struct inode_timespec *ts)
+fs_time_range_check(struct super_block *sb, struct timespec64 *ts)
 {
 	if (unlikely(sb->s_time_max < ts->tv_sec ||
 		sb->s_time_min > ts->tv_sec)) {
@@ -257,7 +327,7 @@ fs_time_range_check(struct super_block *sb, struct inode_timespec *ts)
  * fs_time_range_check.
  * returns 0 otherwise.
  */
-int is_fs_timestamp_bad(struct inode_timespec ts)
+int is_fs_timestamp_bad(struct timespec64 ts)
 {
 	if (ts.tv_nsec == FS_TIMESTAMP_NSEC_NOT_VALID)
 		return -1;
@@ -267,16 +337,16 @@ int is_fs_timestamp_bad(struct inode_timespec ts)
 EXPORT_SYMBOL(is_fs_timestamp_bad);
 
 /*
- * fs_time_trunc - Truncate inode_timespec to a granularity
- * @t: inode_timespec
+ * fs_time_trunc - Truncate timespec64 to a granularity
+ * @t: timespec64
  * @sb: Super block.
  *
  * Truncate a timespec to a granularity. Always rounds down. Granularity
  * must * not be 0 nor greater than a second (NSEC_PER_SEC, or 10^9 ns).
  * Returns 1 on error, 0 otherwise.
  */
-struct inode_timespec
-fs_time_trunc(struct inode_timespec t, struct super_block *sb)
+struct timespec64
+fs_time_trunc(struct timespec64 t, struct super_block *sb)
 {
 	u32 gran = sb->s_time_gran;
 
@@ -300,34 +370,6 @@ fs_time_trunc(struct inode_timespec t, struct super_block *sb)
 EXPORT_SYMBOL(fs_time_trunc);
 
 /**
- * timespec_trunc - Truncate timespec to a granularity
- * @t: Timespec
- * @gran: Granularity in ns.
- *
- * Truncate a timespec to a granularity. Always rounds down. gran must
- * not be 0 nor greater than a second (NSEC_PER_SEC, or 10^9 ns).
- *
- * This function is deprecated and should no longer be used for filesystems.
- * fs_time_trunc should be used instead.
- */
-struct timespec timespec_trunc(struct timespec t, unsigned gran)
-{
-
-	/* Avoid division in the common cases 1 ns and 1 s. */
-	if (gran == 1) {
-		/* nothing */
-	} else if (gran == NSEC_PER_SEC) {
-		t.tv_nsec = 0;
-	} else if (gran > 1 && gran < NSEC_PER_SEC) {
-		t.tv_nsec -= t.tv_nsec % gran;
-	} else {
-		WARN(1, "illegal file time granularity: %u", gran);
-	}
-	return t;
-}
-EXPORT_SYMBOL(timespec_trunc);
-
-/**
  * current_fs_time - Return FS time
  * @sb: Superblock.
  *
@@ -353,26 +395,6 @@ struct timespec64 current_fs_time_sec(struct super_block *sb)
 	return ts;
 }
 EXPORT_SYMBOL(current_fs_time_sec);
-#else
-struct timespec current_fs_time(struct super_block *sb)
-{
-	struct timespec now = current_kernel_time();
-
-	return fs_time_trunc(now, sb);
-}
-EXPORT_SYMBOL(current_fs_time);
-
-struct timespec current_fs_time_sec(struct super_block *sb)
-{
-	struct timespec ts = { get_seconds(), 0 };
-
-	/* range check for time. */
-	fs_time_range_check(sb, &ts);
-
-	return ts;
-}
-EXPORT_SYMBOL(current_fs_time_sec);
-#endif
 
 /*
  * Convert jiffies to milliseconds and back.
-- 
1.9.1

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