int nad_open(char *path, int openflags, struct FHeader *fh, int options);
int nad_header_read(struct FHeader *fh);
int nad_header_write(struct FHeader *fh);
int nad_open(char *path, int openflags, struct FHeader *fh, int options);
int nad_header_read(struct FHeader *fh);
int nad_header_write(struct FHeader *fh);