struct fastbuf *sbuck_read(struct sort_bucket *b);
struct fastbuf *sbuck_write(struct sort_bucket *b);
void sbuck_swap_out(struct sort_bucket *b);
struct fastbuf *sbuck_read(struct sort_bucket *b);
struct fastbuf *sbuck_write(struct sort_bucket *b);
void sbuck_swap_out(struct sort_bucket *b);