di_lnode
typedef struct di_lnode *di_lnode_t; /* endpoint */
struct di_lnode *melnode;
struct di_lnode *me;
(data->lnode_count * sizeof (struct di_lnode));
size = sizeof (struct di_lnode) * st->lnode_count;
#define DI_LNODE(addr) ((struct di_lnode *)((void *)(addr)))
struct di_lnode;