add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/hfs/hfs_fs.h
..
..
@@ -242,19 +242,35 @@
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 /*
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  * There are two time systems.  Both are based on seconds since
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  * a particular time/date.
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- *	Unix:	unsigned lil-endian since 00:00 GMT, Jan. 1, 1970
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+ *	Unix:	signed little-endian since 00:00 GMT, Jan. 1, 1970
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  *	mac:	unsigned big-endian since 00:00 GMT, Jan. 1, 1904
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  *
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+ * HFS implementations are highly inconsistent, this one matches the
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+ * traditional behavior of 64-bit Linux, giving the most useful
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+ * time range between 1970 and 2106, by treating any on-disk timestamp
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+ * under HFS_UTC_OFFSET (Jan 1 1970) as a time between 2040 and 2106.
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  */
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-#define __hfs_u_to_mtime(sec)	cpu_to_be32(sec + 2082844800U - sys_tz.tz_minuteswest * 60)
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-#define __hfs_m_to_utime(sec)	(be32_to_cpu(sec) - 2082844800U  + sys_tz.tz_minuteswest * 60)
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+#define HFS_UTC_OFFSET 2082844800U
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+static inline time64_t __hfs_m_to_utime(__be32 mt)
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+{
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+	time64_t ut = (u32)(be32_to_cpu(mt) - HFS_UTC_OFFSET);
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+
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+	return ut + sys_tz.tz_minuteswest * 60;
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+}
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+
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+static inline __be32 __hfs_u_to_mtime(time64_t ut)
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+{
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+	ut -= sys_tz.tz_minuteswest * 60;
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+
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+	return cpu_to_be32(lower_32_bits(ut) + HFS_UTC_OFFSET);
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+}
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 #define HFS_I(inode)	(container_of(inode, struct hfs_inode_info, vfs_inode))
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 #define HFS_SB(sb)	((struct hfs_sb_info *)(sb)->s_fs_info)
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-#define hfs_m_to_utime(time)	(struct timespec){ .tv_sec = __hfs_m_to_utime(time) }
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-#define hfs_u_to_mtime(time)	__hfs_u_to_mtime((time).tv_sec)
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-#define hfs_mtime()		__hfs_u_to_mtime(get_seconds())
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+#define hfs_m_to_utime(time)   (struct timespec64){ .tv_sec = __hfs_m_to_utime(time) }
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+#define hfs_u_to_mtime(time)   __hfs_u_to_mtime((time).tv_sec)
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+#define hfs_mtime()		__hfs_u_to_mtime(ktime_get_real_seconds())
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 static inline const char *hfs_mdb_name(struct super_block *sb)
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 {