LU-7340 mdd: changelogs garbage collection

[fs/lustre-release.git] / lustre / include / lustre_compat.h

diff --git a/lustre/include/lustre_compat.h b/lustre/include/lustre_compat.h
index 237d7b8..9bb08dd 100644 (file)
--- a/lustre/include/lustre_compat.h
+++ b/lustre/include/lustre_compat.h
@@ -651,4 +651,22 @@ static inline struct timespec current_time(struct inode *inode)
 }
 #endif
 
 }
 #endif
 

+#ifndef time_after32
+/**
+ * time_after32 - compare two 32-bit relative times
+ * @a: the time which may be after @b
+ * @b: the time which may be before @a
+ *
+ * time_after32(a, b) returns true if the time @a is after time @b.
+ * time_before32(b, a) returns true if the time @b is before time @a.
+ *
+ * Similar to time_after(), compare two 32-bit timestamps for relative
+ * times.  This is useful for comparing 32-bit seconds values that can't
+ * be converted to 64-bit values (e.g. due to disk format or wire protocol
+ * issues) when it is known that the times are less than 68 years apart.
+ */
+#define time_after32(a, b)     ((s32)((u32)(b) - (u32)(a)) < 0)
+#define time_before32(b, a)    time_after32(a, b)
+#endif
+

 #endif /* _LUSTRE_COMPAT_H */
 #endif /* _LUSTRE_COMPAT_H */