blist
bl = malloc(offsetof(struct blist, bl_root[nodes]), M_SWAP, flags |
void blist_stats(blist_t blist, struct sbuf *s);
daddr_t blist_alloc(blist_t blist, int *count, int maxcount);
daddr_t blist_avail(blist_t blist);
void blist_destroy(blist_t blist);
void blist_free(blist_t blist, daddr_t blkno, daddr_t count);
void blist_print(blist_t blist);
struct blist *sw_blist;