- support relatime / norelatime

include/platform.h

@@ -350,7 +350,9 @@ static ALWAYS_INLINE char* strchrnul(const char *s, char c)
 #ifndef MS_SHARED
 #define MS_SHARED      (1<<20)
 #endif
-
+#ifndef MS_RELATIME
+#define MS_RELATIME   (1 << 21)
+#endif
 
 #if !defined(BLKSSZGET)
 #define BLKSSZGET _IO(0x12, 104)

include/usage.h

@@ -2661,6 +2661,7 @@
        "	[a]sync		Writes are asynchronous / synchronous\n" \
        "	[no]atime	Disable / enable updates to inode access times\n" \
        "	[no]diratime	Disable / enable atime updates to directories\n" \
+       "	[no]relatime	Disable / enable atime updates relative to modification time\n" \
        "	[no]dev		Allow use of special device files / disallow them\n" \
        "	[no]exec	Allow use of executable files / disallow them\n" \
        "	[no]suid	Allow set-user-id-root programs / disallow them\n" \