#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); \
return hash & (NLM_HOST_NRHASH - 1);
}
+/*
+ * Allocate and initialize an nlm_host. Common to both client and server.
+ */
+static struct nlm_host *nlm_alloc_host(struct nlm_lookup_host_info *ni,
+ struct nsm_handle *nsm)
+{
+ struct nlm_host *host = NULL;
+ unsigned long now = jiffies;
+
+ if (nsm != NULL)
+ atomic_inc(&nsm->sm_count);
+ else {
+ host = NULL;
+ nsm = nsm_get_handle(ni->sap, ni->salen,
+ ni->hostname, ni->hostname_len);
+ if (unlikely(nsm == NULL)) {
+ dprintk("lockd: %s failed; no nsm handle\n",
+ __func__);
+ goto out;
+ }
+ }
+
+ host = kmalloc(sizeof(*host), GFP_KERNEL);
+ if (unlikely(host == NULL)) {
+ dprintk("lockd: %s failed; no memory\n", __func__);
+ nsm_release(nsm);
+ goto out;
+ }
+
+ memcpy(nlm_addr(host), ni->sap, ni->salen);
+ host->h_addrlen = ni->salen;
+ rpc_set_port(nlm_addr(host), 0);
+ host->h_srcaddrlen = 0;
+
+ host->h_rpcclnt = NULL;
+ host->h_name = nsm->sm_name;
+ host->h_version = ni->version;
+ host->h_proto = ni->protocol;
+ host->h_reclaiming = 0;
+ host->h_server = ni->server;
+ host->h_noresvport = ni->noresvport;
+ host->h_inuse = 0;
+ init_waitqueue_head(&host->h_gracewait);
+ init_rwsem(&host->h_rwsem);
+ host->h_state = 0;
+ host->h_nsmstate = 0;
+ host->h_pidcount = 0;
+ atomic_set(&host->h_count, 1);
+ mutex_init(&host->h_mutex);
+ host->h_nextrebind = now + NLM_HOST_REBIND;
+ host->h_expires = now + NLM_HOST_EXPIRE;
+ INIT_LIST_HEAD(&host->h_lockowners);
+ spin_lock_init(&host->h_lock);
+ INIT_LIST_HEAD(&host->h_granted);
+ INIT_LIST_HEAD(&host->h_reclaim);
+ host->h_nsmhandle = nsm;
+ host->h_addrbuf = nsm->sm_addrbuf;
+
+out:
+ return host;
+}
+
/*
* Common host lookup routine for server & client
*/
* 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)];
+ 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;
goto out;
}
- /*
- * The host wasn't in our hash table. If we don't
- * have an NSM handle for it yet, create one.
- */
- if (nsm)
- atomic_inc(&nsm->sm_count);
- else {
- host = NULL;
- nsm = nsm_get_handle(ni->sap, ni->salen,
- ni->hostname, ni->hostname_len);
- if (!nsm) {
- dprintk("lockd: nlm_lookup_host failed; "
- "no nsm handle\n");
- goto out;
- }
- }
-
- host = kzalloc(sizeof(*host), GFP_KERNEL);
- if (!host) {
- nsm_release(nsm);
- dprintk("lockd: nlm_lookup_host failed; no memory\n");
+ host = nlm_alloc_host(ni, nsm);
+ if (unlikely(host == NULL))
goto out;
- }
- host->h_name = nsm->sm_name;
- host->h_addrbuf = nsm->sm_addrbuf;
- memcpy(nlm_addr(host), ni->sap, ni->salen);
- host->h_addrlen = ni->salen;
- rpc_set_port(nlm_addr(host), 0);
+
memcpy(nlm_srcaddr(host), ni->src_sap, ni->src_len);
host->h_srcaddrlen = ni->src_len;
- host->h_version = ni->version;
- host->h_proto = ni->protocol;
- host->h_rpcclnt = NULL;
- mutex_init(&host->h_mutex);
- host->h_nextrebind = jiffies + NLM_HOST_REBIND;
- host->h_expires = jiffies + NLM_HOST_EXPIRE;
- atomic_set(&host->h_count, 1);
- init_waitqueue_head(&host->h_gracewait);
- init_rwsem(&host->h_rwsem);
- host->h_state = 0; /* pseudo NSM state */
- host->h_nsmstate = 0; /* real NSM state */
- host->h_nsmhandle = nsm;
- host->h_server = ni->server;
- host->h_noresvport = ni->noresvport;
hlist_add_head(&host->h_hash, chain);
- INIT_LIST_HEAD(&host->h_lockowners);
- spin_lock_init(&host->h_lock);
- INIT_LIST_HEAD(&host->h_granted);
- INIT_LIST_HEAD(&host->h_reclaim);
nrhosts++;
}
/*
- * 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,
};
(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 *)&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), 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: %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), ni.src_sap, ni.src_len);
+ host->h_srcaddrlen = ni.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);
if (nrhosts) {
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) {
+ 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;
projects / firefly-linux-kernel-4.4.55.git / blobdiff