nlm_vhold_find_locked
nvp = nlm_vhold_find_locked(hostp, vp);
nvp = nlm_vhold_find_locked(hostp, vp);
nvp = nlm_vhold_find_locked(hostp, vp);
struct nlm_vhold *nlm_vhold_find_locked(struct nlm_host *, const vnode_t *);