X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Finclude%2Flustre_compat.h;h=9bb08dd7e93766cb30f82776db3c936b7e1511df;hp=237d7b81647d37c25617ec6d29a118bcd9ad2109;hb=3442db6faf685fbdbd092bdfdc8d273e4990a141;hpb=11aae875be5fb30a88281ab47e491b75447b299b

diff --git a/lustre/include/lustre_compat.h b/lustre/include/lustre_compat.h
index 237d7b8..9bb08dd 100644
--- 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
 
+#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 */