add MAX_HANDLE_SZ

include/fcntl.h

@@ -288,6 +288,8 @@ struct file_handle {
 	unsigned char f_handle[];
 };
 
+#define MAX_HANDLE_SZ  128
+
 int name_to_handle_at(int dirfd, const char *pathname,
 	struct file_handle *handle, int *mount_id, int flags);
 int open_by_handle_at(int mount_fd, struct file_handle *handle, int flags);