#define NLM_HOST_EXPIRE (300 * HZ)
#define NLM_HOST_COLLECT (120 * HZ)
-static struct hlist_head nlm_hosts[NLM_HOST_NRHASH];
+static struct hlist_head nlm_server_hosts[NLM_HOST_NRHASH];
+static struct hlist_head nlm_client_hosts[NLM_HOST_NRHASH];
#define for_each_host(host, pos, chain, table) \
for ((chain) = (table); \
(chain), h_hash)
static unsigned long next_gc;
-static int nrhosts;
+static unsigned long nrhosts;
static DEFINE_MUTEX(nlm_host_mutex);
static void nlm_gc_hosts(void);
const u32 version; /* NLM version to search for */
const char *hostname; /* remote's hostname */
const size_t hostname_len; /* it's length */
- const struct sockaddr *src_sap; /* our address (optional) */
- const size_t src_len; /* it's length */
const int noresvport; /* use non-priv port */
};
}
/*
- * Common host lookup routine for server & client
- */
-static struct nlm_host *nlm_lookup_host(struct nlm_lookup_host_info *ni)
-{
- struct hlist_head *chain;
- struct hlist_node *pos;
- struct nlm_host *host;
- struct nsm_handle *nsm = NULL;
-
- mutex_lock(&nlm_host_mutex);
-
- if (time_after_eq(jiffies, next_gc))
- nlm_gc_hosts();
-
- /* We may keep several nlm_host objects for a peer, because each
- * nlm_host is identified by
- * (address, protocol, version, server/client)
- * We could probably simplify this a little by putting all those
- * different NLM rpc_clients into one single nlm_host object.
- * This would allow us to have one nlm_host per address.
- */
- chain = &nlm_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;
-
- /* See if we have an NSM handle for this client */
- if (!nsm)
- nsm = host->h_nsmhandle;
-
- if (host->h_proto != ni->protocol)
- continue;
- if (host->h_version != ni->version)
- continue;
- if (host->h_server != ni->server)
- continue;
- if (ni->server && ni->src_len != 0 &&
- !rpc_cmp_addr(nlm_srcaddr(host), ni->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: nlm_lookup_host found host %s (%s)\n",
- host->h_name, host->h_addrbuf);
- goto out;
- }
-
- host = nlm_alloc_host(ni, nsm);
- if (unlikely(host == NULL))
- goto out;
-
- memcpy(nlm_srcaddr(host), ni->src_sap, ni->src_len);
- host->h_srcaddrlen = ni->src_len;
- hlist_add_head(&host->h_hash, chain);
-
- nrhosts++;
-
- dprintk("lockd: nlm_lookup_host created host %s\n",
- host->h_name);
-
-out:
- mutex_unlock(&nlm_host_mutex);
- return host;
-}
-
-/*
- * Destroy a host
+ * Destroy an nlm_host and free associated resources
+ *
+ * Caller must hold nlm_host_mutex.
*/
-static void
-nlm_destroy_host(struct nlm_host *host)
+static void nlm_destroy_host_locked(struct nlm_host *host)
{
struct rpc_clnt *clnt;
+ dprintk("lockd: destroy host %s\n", host->h_name);
+
BUG_ON(!list_empty(&host->h_lockowners));
BUG_ON(atomic_read(&host->h_count));
+ hlist_del_init(&host->h_hash);
+
nsm_unmonitor(host);
nsm_release(host->h_nsmhandle);
if (clnt != NULL)
rpc_shutdown_client(clnt);
kfree(host);
+
+ nrhosts--;
}
/**
.hostname_len = strlen(hostname),
.noresvport = noresvport,
};
+ struct hlist_head *chain;
+ struct hlist_node *pos;
+ struct nlm_host *host;
+ struct nsm_handle *nsm = NULL;
dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__,
(hostname ? hostname : "<none>"), version,
(protocol == IPPROTO_UDP ? "udp" : "tcp"));
- return nlm_lookup_host(&ni);
+ mutex_lock(&nlm_host_mutex);
+
+ chain = &nlm_client_hosts[nlm_hash_address(sap)];
+ hlist_for_each_entry(host, pos, chain, h_hash) {
+ if (!rpc_cmp_addr(nlm_addr(host), sap))
+ continue;
+
+ /* Same address. Share an NSM handle if we already have one */
+ if (nsm == NULL)
+ nsm = host->h_nsmhandle;
+
+ if (host->h_proto != protocol)
+ continue;
+ if (host->h_version != version)
+ continue;
+
+ 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;
+
+ 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;
+}
+
+/**
+ * nlmclnt_release_host - release client nlm_host
+ * @host: nlm_host to release
+ *
+ */
+void nlmclnt_release_host(struct nlm_host *host)
+{
+ if (host == NULL)
+ return;
+
+ dprintk("lockd: release client host %s\n", host->h_name);
+
+ BUG_ON(atomic_read(&host->h_count) < 0);
+ BUG_ON(host->h_server);
+
+ if (atomic_dec_and_test(&host->h_count)) {
+ BUG_ON(!list_empty(&host->h_lockowners));
+ BUG_ON(!list_empty(&host->h_granted));
+ BUG_ON(!list_empty(&host->h_reclaim));
+
+ mutex_lock(&nlm_host_mutex);
+ nlm_destroy_host_locked(host);
+ mutex_unlock(&nlm_host_mutex);
+ }
}
/**
const char *hostname,
const size_t hostname_len)
{
+ struct hlist_head *chain;
+ struct hlist_node *pos;
+ struct nlm_host *host = NULL;
+ struct nsm_handle *nsm = NULL;
struct sockaddr_in sin = {
.sin_family = AF_INET,
};
struct sockaddr_in6 sin6 = {
.sin6_family = AF_INET6,
};
+ struct sockaddr *src_sap;
+ size_t src_len = rqstp->rq_addrlen;
struct nlm_lookup_host_info ni = {
.server = 1,
.sap = svc_addr(rqstp),
.version = rqstp->rq_vers,
.hostname = hostname,
.hostname_len = hostname_len,
- .src_len = rqstp->rq_addrlen,
};
dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__,
(int)hostname_len, hostname, rqstp->rq_vers,
(rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp"));
+ mutex_lock(&nlm_host_mutex);
+
switch (ni.sap->sa_family) {
case AF_INET:
sin.sin_addr.s_addr = rqstp->rq_daddr.addr.s_addr;
- ni.src_sap = (struct sockaddr *)&sin;
+ src_sap = (struct sockaddr *)&sin;
break;
case AF_INET6:
ipv6_addr_copy(&sin6.sin6_addr, &rqstp->rq_daddr.addr6);
- ni.src_sap = (struct sockaddr *)&sin6;
+ src_sap = (struct sockaddr *)&sin6;
break;
default:
- return NULL;
+ dprintk("lockd: %s failed; unrecognized address family\n",
+ __func__);
+ goto out;
}
- return nlm_lookup_host(&ni);
+ 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);
}
/*
return host;
}
-/*
- * Release NLM host after use
- */
-void nlm_release_host(struct nlm_host *host)
-{
- if (host != NULL) {
- dprintk("lockd: release host %s\n", host->h_name);
- BUG_ON(atomic_read(&host->h_count) < 0);
- if (atomic_dec_and_test(&host->h_count)) {
- BUG_ON(!list_empty(&host->h_lockowners));
- BUG_ON(!list_empty(&host->h_granted));
- BUG_ON(!list_empty(&host->h_reclaim));
- }
- }
-}
-
static struct nlm_host *next_host_state(struct hlist_head *cache,
struct nsm_handle *nsm,
const struct nlm_reboot *info)
* lock for this.
* To avoid processing a host several times, we match the nsmstate.
*/
- while ((host = next_host_state(nlm_hosts, nsm, info)) != NULL) {
- if (host->h_server) {
- /* We're server for this guy, just ditch
- * all the locks he held. */
- nlmsvc_free_host_resources(host);
- } else {
- /* He's the server, initiate lock recovery. */
- nlmclnt_recovery(host);
- }
- nlm_release_host(host);
+ while ((host = next_host_state(nlm_server_hosts, nsm, info)) != NULL) {
+ nlmsvc_free_host_resources(host);
+ nlmsvc_release_host(host);
+ }
+ while ((host = next_host_state(nlm_client_hosts, nsm, info)) != NULL) {
+ nlmclnt_recovery(host);
+ nlmclnt_release_host(host);
}
+
nsm_release(nsm);
}
/* First, make all hosts eligible for gc */
dprintk("lockd: nuking all hosts...\n");
- for_each_host(host, pos, chain, nlm_hosts) {
+ for_each_host(host, pos, chain, nlm_server_hosts) {
host->h_expires = jiffies - 1;
if (host->h_rpcclnt) {
rpc_shutdown_client(host->h_rpcclnt);
mutex_unlock(&nlm_host_mutex);
/* complain if any hosts are left */
- if (nrhosts) {
+ if (nrhosts != 0) {
printk(KERN_WARNING "lockd: couldn't shutdown host module!\n");
- dprintk("lockd: %d hosts left:\n", nrhosts);
- for_each_host(host, pos, chain, nlm_hosts) {
+ dprintk("lockd: %lu hosts left:\n", nrhosts);
+ for_each_host(host, pos, chain, nlm_server_hosts) {
dprintk(" %s (cnt %d use %d exp %ld)\n",
host->h_name, atomic_read(&host->h_count),
host->h_inuse, host->h_expires);
struct nlm_host *host;
dprintk("lockd: host garbage collection\n");
- for_each_host(host, pos, chain, nlm_hosts)
+ for_each_host(host, pos, chain, nlm_server_hosts)
host->h_inuse = 0;
/* Mark all hosts that hold locks, blocks or shares */
nlmsvc_mark_resources();
- for_each_host_safe(host, pos, next, chain, nlm_hosts) {
+ for_each_host_safe(host, pos, next, chain, nlm_server_hosts) {
if (atomic_read(&host->h_count) || host->h_inuse
|| time_before(jiffies, host->h_expires)) {
dprintk("nlm_gc_hosts skipping %s "
host->h_inuse, host->h_expires);
continue;
}
- dprintk("lockd: delete host %s\n", host->h_name);
- hlist_del_init(&host->h_hash);
-
- nlm_destroy_host(host);
- nrhosts--;
+ nlm_destroy_host_locked(host);
}
next_gc = jiffies + NLM_HOST_COLLECT;