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lockd: Clean up nlmsvc_lookup_host()
Clean up. Change nlmsvc_lookup_host() to be purpose-built for server-side nlm_host management. This replaces the generic nlm_lookup_host() helper function, just like on the client side. The lookup logic is specialized for server host lookups. The server side cache also gets its own specialized equivalent of the nlm_release_host() function. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever
Trond Myklebust
parent
8ea6ecc8b0
commit
67216b94d4
@ -383,6 +383,10 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
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const char *hostname,
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const size_t hostname_len)
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{
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struct hlist_head *chain;
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struct hlist_node *pos;
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struct nlm_host *host = NULL;
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struct nsm_handle *nsm = NULL;
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struct sockaddr_in sin = {
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.sin_family = AF_INET,
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};
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@ -404,6 +408,8 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
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(int)hostname_len, hostname, rqstp->rq_vers,
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(rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp"));
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mutex_lock(&nlm_host_mutex);
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switch (ni.sap->sa_family) {
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case AF_INET:
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sin.sin_addr.s_addr = rqstp->rq_daddr.addr.s_addr;
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@ -414,10 +420,73 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
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ni.src_sap = (struct sockaddr *)&sin6;
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break;
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default:
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return NULL;
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dprintk("lockd: %s failed; unrecognized address family\n",
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__func__);
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goto out;
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}
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return nlm_lookup_host(&ni);
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if (time_after_eq(jiffies, next_gc))
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nlm_gc_hosts();
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chain = &nlm_hosts[nlm_hash_address(ni.sap)];
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hlist_for_each_entry(host, pos, chain, h_hash) {
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if (!rpc_cmp_addr(nlm_addr(host), ni.sap))
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continue;
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/* Same address. Share an NSM handle if we already have one */
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if (nsm == NULL)
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nsm = host->h_nsmhandle;
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if (host->h_proto != ni.protocol)
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continue;
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if (host->h_version != ni.version)
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continue;
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if (!rpc_cmp_addr(nlm_srcaddr(host), ni.src_sap))
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continue;
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/* Move to head of hash chain. */
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hlist_del(&host->h_hash);
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hlist_add_head(&host->h_hash, chain);
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nlm_get_host(host);
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dprintk("lockd: %s found host %s (%s)\n",
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__func__, host->h_name, host->h_addrbuf);
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goto out;
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}
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host = nlm_alloc_host(&ni, nsm);
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if (unlikely(host == NULL))
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goto out;
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memcpy(nlm_srcaddr(host), ni.src_sap, ni.src_len);
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host->h_srcaddrlen = ni.src_len;
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hlist_add_head(&host->h_hash, chain);
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nrhosts++;
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dprintk("lockd: %s created host %s (%s)\n",
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__func__, host->h_name, host->h_addrbuf);
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out:
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mutex_unlock(&nlm_host_mutex);
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return host;
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}
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/**
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* nlmsvc_release_host - release server nlm_host
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* @host: nlm_host to release
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*
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* Host is destroyed later in nlm_gc_host().
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*/
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void nlmsvc_release_host(struct nlm_host *host)
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{
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if (host == NULL)
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return;
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dprintk("lockd: release server host %s\n", host->h_name);
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BUG_ON(atomic_read(&host->h_count) < 0);
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BUG_ON(!host->h_server);
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atomic_dec(&host->h_count);
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}
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/*
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@ -517,22 +586,6 @@ struct nlm_host * nlm_get_host(struct nlm_host *host)
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return host;
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}
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/*
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* Release NLM host after use
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*/
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void nlm_release_host(struct nlm_host *host)
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{
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if (host != NULL) {
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dprintk("lockd: release host %s\n", host->h_name);
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BUG_ON(atomic_read(&host->h_count) < 0);
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if (atomic_dec_and_test(&host->h_count)) {
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BUG_ON(!list_empty(&host->h_lockowners));
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BUG_ON(!list_empty(&host->h_granted));
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BUG_ON(!list_empty(&host->h_reclaim));
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}
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}
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}
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static struct nlm_host *next_host_state(struct hlist_head *cache,
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struct nsm_handle *nsm,
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const struct nlm_reboot *info)
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@ -581,7 +634,7 @@ void nlm_host_rebooted(const struct nlm_reboot *info)
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*/
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while ((host = next_host_state(nlm_hosts, nsm, info)) != NULL) {
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nlmsvc_free_host_resources(host);
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nlm_release_host(host);
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nlmsvc_release_host(host);
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}
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while ((host = next_host_state(nlm_client_hosts, nsm, info)) != NULL) {
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nlmclnt_recovery(host);
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@ -51,7 +51,7 @@ nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
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return 0;
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no_locks:
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nlm_release_host(host);
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nlmsvc_release_host(host);
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if (error)
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return error;
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return nlm_lck_denied_nolocks;
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@ -92,7 +92,7 @@ nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
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else
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dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rc;
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}
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@ -134,7 +134,7 @@ nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
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else
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dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rc;
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}
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@ -164,7 +164,7 @@ nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
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resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
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dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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@ -197,7 +197,7 @@ nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
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resp->status = nlmsvc_unlock(file, &argp->lock);
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dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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@ -334,7 +334,7 @@ nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
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resp->status = nlmsvc_share_file(host, file, argp);
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dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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@ -367,7 +367,7 @@ nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
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resp->status = nlmsvc_unshare_file(host, file, argp);
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dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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@ -399,7 +399,7 @@ nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
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return rpc_success;
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nlmsvc_free_host_resources(host);
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nlm_release_host(host);
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nlmsvc_release_host(host);
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return rpc_success;
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}
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@ -80,7 +80,7 @@ nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
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return 0;
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no_locks:
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nlm_release_host(host);
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nlmsvc_release_host(host);
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if (error)
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return error;
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return nlm_lck_denied_nolocks;
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@ -122,7 +122,7 @@ nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
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dprintk("lockd: TEST status %d vers %d\n",
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ntohl(resp->status), rqstp->rq_vers);
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nlm_release_host(host);
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rc;
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}
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@ -164,7 +164,7 @@ nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
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else
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dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rc;
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}
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@ -194,7 +194,7 @@ nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
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resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
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dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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@ -227,7 +227,7 @@ nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
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resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
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dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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@ -261,7 +261,7 @@ void nlmsvc_release_call(struct nlm_rqst *call)
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{
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if (!atomic_dec_and_test(&call->a_count))
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return;
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nlm_release_host(call->a_host);
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nlmsvc_release_host(call->a_host);
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kfree(call);
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}
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@ -374,7 +374,7 @@ nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
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resp->status = cast_status(nlmsvc_share_file(host, file, argp));
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dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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@ -407,7 +407,7 @@ nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
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resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
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dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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@ -439,7 +439,7 @@ nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
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return rpc_success;
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nlmsvc_free_host_resources(host);
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nlm_release_host(host);
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nlmsvc_release_host(host);
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return rpc_success;
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}
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@ -227,10 +227,10 @@ void nlmclnt_release_host(struct nlm_host *);
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struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
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const char *hostname,
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const size_t hostname_len);
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void nlmsvc_release_host(struct nlm_host *);
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struct rpc_clnt * nlm_bind_host(struct nlm_host *);
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void nlm_rebind_host(struct nlm_host *);
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struct nlm_host * nlm_get_host(struct nlm_host *);
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void nlm_release_host(struct nlm_host *);
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void nlm_shutdown_hosts(void);
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void nlm_host_rebooted(const struct nlm_reboot *);
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