@@ -93,4 +93,8 @@ struct timespec64 {
long tv_nsec; /* nanoseconds */
};
+#define U32_MAX ((uint32_t)~0U)
+#define S32_MAX ((int32_t)(U32_MAX >> 1))
+#define S32_MIN ((int32_t)(-S32_MAX - 1))
+
#endif /* __XFS_FS_COMPAT_H__ */
@@ -848,11 +848,33 @@ struct xfs_agfl {
ASSERT(xfs_daddr_to_agno(mp, d) == \
xfs_daddr_to_agno(mp, (d) + (len) - 1)))
+/*
+ * XFS Timestamps
+ * ==============
+ *
+ * Traditional ondisk inode timestamps consist of signed 32-bit counters for
+ * seconds and nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC
+ * 1970, which means that the timestamp epoch is the same as the Unix epoch.
+ * Therefore, the ondisk min and max defined here can be used directly to
+ * constrain the incore timestamps on a Unix system.
+ */
typedef struct xfs_timestamp {
__be32 t_sec; /* timestamp seconds */
__be32 t_nsec; /* timestamp nanoseconds */
} xfs_timestamp_t;
+/*
+ * Smallest possible ondisk seconds value with traditional timestamps. This
+ * corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901.
+ */
+#define XFS_LEGACY_TIME_MIN ((int64_t)S32_MIN)
+
+/*
+ * Largest possible ondisk seconds value with traditional timestamps. This
+ * corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038.
+ */
+#define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX)
+
/*
* On-disk inode structure.
*