vn_copy_file_range
nd->nd_repstat = vn_copy_file_range(vp, &inoff, tovp, &outoff,
nd->nd_repstat = vn_copy_file_range(vp, &inoff, tovp, &outoff,
error = vn_copy_file_range(invp, &inoff, outvp, &outoff, &retlen,
int vn_copy_file_range(struct vnode *invp, off_t *inoffp,