+ if (time_after_eq(jiffies, next_gc))
+ nlm_gc_hosts();
+
+ chain = &nlm_server_hosts[nlm_hash_address(ni.sap)];
+ hlist_for_each_entry(host, pos, chain, h_hash) {
+ if (!rpc_cmp_addr(nlm_addr(host), ni.sap))
+ continue;
+
+ /* Same address. Share an NSM handle if we already have one */
+ if (nsm == NULL)
+ nsm = host->h_nsmhandle;
+
+ if (host->h_proto != ni.protocol)
+ continue;
+ if (host->h_version != ni.version)
+ continue;
+ if (!rpc_cmp_addr(nlm_srcaddr(host), src_sap))
+ continue;
+
+ /* Move to head of hash chain. */
+ hlist_del(&host->h_hash);
+ hlist_add_head(&host->h_hash, chain);
+
+ nlm_get_host(host);
+ dprintk("lockd: %s found host %s (%s)\n",
+ __func__, host->h_name, host->h_addrbuf);
+ goto out;
+ }
+
+ host = nlm_alloc_host(&ni, nsm);
+ if (unlikely(host == NULL))
+ goto out;
+
+ memcpy(nlm_srcaddr(host), src_sap, src_len);
+ host->h_srcaddrlen = src_len;
+ hlist_add_head(&host->h_hash, chain);
+ nrhosts++;
+
+ dprintk("lockd: %s created host %s (%s)\n",
+ __func__, host->h_name, host->h_addrbuf);
+
+out:
+ mutex_unlock(&nlm_host_mutex);
+ return host;
+}
+
+/**
+ * nlmsvc_release_host - release server nlm_host
+ * @host: nlm_host to release
+ *
+ * Host is destroyed later in nlm_gc_host().
+ */
+void nlmsvc_release_host(struct nlm_host *host)
+{
+ if (host == NULL)
+ return;
+
+ dprintk("lockd: release server host %s\n", host->h_name);
+
+ BUG_ON(atomic_read(&host->h_count) < 0);
+ BUG_ON(!host->h_server);
+ atomic_dec(&host->h_count);