Function cache_zap_locked

freebsd/kern/vfs_cache.c:1442–1480

* cache_zap_locked(): * * Removes a namecache entry from cache, whether it contains an actual * pointer to a vnode or if it is just a negative cache entry. */

 *   pointer to a vnode or if it is just a negative cache entry.
 */
static void
cache_zap_locked(struct namecache *ncp)
{
	struct nchashhead *ncpp;
	struct vnode *dvp, *vp;

	dvp = ncp->nc_dvp;
	vp = ncp->nc_vp;

	if (!(ncp->nc_flag & NCF_NEGATIVE))
		cache_assert_vnode_locked(vp);
	cache_assert_vnode_locked(dvp);
	cache_assert_bucket_locked(ncp);

	cache_ncp_invalidate(ncp);

	ncpp = NCP2BUCKET(ncp);
	CK_SLIST_REMOVE(ncpp, ncp, namecache, nc_hash);
	if (!(ncp->nc_flag & NCF_NEGATIVE)) {
		SDT_PROBE3(vfs, namecache, zap, done, dvp, ncp->nc_name, vp);
		TAILQ_REMOVE(&vp->v_cache_dst, ncp, nc_dst);
		if (ncp == vp->v_cache_dd) {
			atomic_store_ptr(&vp->v_cache_dd, NULL);
		}
	} else {
		SDT_PROBE2(vfs, namecache, zap_negative, done, dvp, ncp->nc_name);
		cache_neg_remove(ncp);
	}
	if (ncp->nc_flag & NCF_ISDOTDOT) {
		if (ncp == dvp->v_cache_dd) {
			atomic_store_ptr(&dvp->v_cache_dd, NULL);
		}
	} else {
		LIST_REMOVE(ncp, nc_src);
		if (LIST_EMPTY(&dvp->v_cache_src)) {
			ncp->nc_flag |= NCF_DVDROP;
		}
	}
}

static void
cache_zap_negative_locked_vnode_kl(struct namecache *ncp, struct vnode *vp)