dmu_set_bonus
VERIFY0(dmu_set_bonus(db, lr->lr_size, tx));
VERIFY(0 == dmu_set_bonus(hdl->sa_bonus, spilling ?
int dmu_set_bonus(dmu_buf_t *, int, dmu_tx_t *);
VERIFY0(dmu_set_bonus(db, len + ZFS_OLD_ZNODE_PHYS_SIZE, tx));
VERIFY(dmu_set_bonus(db, len, tx) == 0);