+#ifndef MS_RELATIME
+#define MS_RELATIME 0x200000 /* 200000: Update access times relative
+ to mtime/ctime */
+#endif
+/*
+ * NFS fs-specific mount option flags
+ *
+ * MS_DUMMY is assigned to mount options that are not to be
+ * passed to the kernel via the "flags" argument. These are
+ * generally ignored or handled entirely in user space.
+ */
+#define MS_DUMMY 0x00000000
+#define MS_USERS 0x40000000
+#define MS_USER 0x80000000
+