Function cache_prehash

freebsd/kern/vfs_cache.c:711–716

* TODO: With the value stored we can do better than computing the hash based * on the address. The choice of FNV should also be revisited. */

 * on the address. The choice of FNV should also be revisited.
 */
static void
cache_prehash(struct vnode *vp)
{

	vp->v_nchash = fnv_32_buf(&vp, sizeof(vp), FNV1_32_INIT);
}

static uint32_t
cache_get_hash(char *name, u_char len, struct vnode *dvp)