#define NLM_HOST_EXPIRE ((nrhosts > NLM_HOST_MAX)? 300 * HZ : 120 * HZ)
#define NLM_HOST_COLLECT ((nrhosts > NLM_HOST_MAX)? 120 * HZ : 60 * HZ)
-static struct nlm_host * nlm_hosts[NLM_HOST_NRHASH];
+static struct hlist_head nlm_hosts[NLM_HOST_NRHASH];
static unsigned long next_gc;
static int nrhosts;
static DEFINE_MUTEX(nlm_host_mutex);
static void nlm_gc_hosts(void);
-
-/*
- * Find an NLM server handle in the cache. If there is none, create it.
- */
-struct nlm_host *
-nlmclnt_lookup_host(struct sockaddr_in *sin, int proto, int version)
-{
- return nlm_lookup_host(0, sin, proto, version);
-}
-
-/*
- * Find an NLM client handle in the cache. If there is none, create it.
- */
-struct nlm_host *
-nlmsvc_lookup_host(struct svc_rqst *rqstp)
-{
- return nlm_lookup_host(1, &rqstp->rq_addr,
- rqstp->rq_prot, rqstp->rq_vers);
-}
+static struct nsm_handle * __nsm_find(const struct sockaddr_in *,
+ const char *, int, int);
+static struct nsm_handle * nsm_find(const struct sockaddr_in *sin,
+ const char *hostname,
+ int hostname_len);
/*
* Common host lookup routine for server & client
*/
-struct nlm_host *
-nlm_lookup_host(int server, struct sockaddr_in *sin,
- int proto, int version)
+static struct nlm_host *
+nlm_lookup_host(int server, const struct sockaddr_in *sin,
+ int proto, int version,
+ const char *hostname,
+ int hostname_len)
{
- struct nlm_host *host, **hp;
- u32 addr;
+ struct hlist_head *chain;
+ struct hlist_node *pos;
+ struct nlm_host *host;
+ struct nsm_handle *nsm = NULL;
int hash;
- dprintk("lockd: nlm_lookup_host(%08x, p=%d, v=%d)\n",
- (unsigned)(sin? ntohl(sin->sin_addr.s_addr) : 0), proto, version);
+ dprintk("lockd: nlm_lookup_host(%u.%u.%u.%u, p=%d, v=%d, my role=%s, name=%.*s)\n",
+ NIPQUAD(sin->sin_addr.s_addr), proto, version,
+ server? "server" : "client",
+ hostname_len,
+ hostname? hostname : "<none>");
+
hash = NLM_ADDRHASH(sin->sin_addr.s_addr);
if (time_after_eq(jiffies, next_gc))
nlm_gc_hosts();
- for (hp = &nlm_hosts[hash]; (host = *hp) != 0; hp = &host->h_next) {
+ /* 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[hash];
+ hlist_for_each_entry(host, pos, chain, h_hash) {
+ if (!nlm_cmp_addr(&host->h_addr, sin))
+ continue;
+
+ /* See if we have an NSM handle for this client */
+ if (!nsm)
+ nsm = host->h_nsmhandle;
+
if (host->h_proto != proto)
continue;
if (host->h_version != version)
if (host->h_server != server)
continue;
- if (nlm_cmp_addr(&host->h_addr, sin)) {
- if (hp != nlm_hosts + hash) {
- *hp = host->h_next;
- host->h_next = nlm_hosts[hash];
- nlm_hosts[hash] = host;
- }
- nlm_get_host(host);
- mutex_unlock(&nlm_host_mutex);
- return host;
- }
- }
+ /* Move to head of hash chain. */
+ hlist_del(&host->h_hash);
+ hlist_add_head(&host->h_hash, chain);
- /* Ooops, no host found, create it */
- dprintk("lockd: creating host entry\n");
+ nlm_get_host(host);
+ goto out;
+ }
+ if (nsm)
+ atomic_inc(&nsm->sm_count);
- if (!(host = (struct nlm_host *) kmalloc(sizeof(*host), GFP_KERNEL)))
- goto nohost;
- memset(host, 0, sizeof(*host));
+ host = NULL;
- addr = sin->sin_addr.s_addr;
- sprintf(host->h_name, "%u.%u.%u.%u", NIPQUAD(addr));
+ /* Sadly, the host isn't in our hash table yet. See if
+ * we have an NSM handle for it. If not, create one.
+ */
+ if (!nsm && !(nsm = nsm_find(sin, hostname, hostname_len)))
+ goto out;
+ host = kzalloc(sizeof(*host), GFP_KERNEL);
+ if (!host) {
+ nsm_release(nsm);
+ goto out;
+ }
+ host->h_name = nsm->sm_name;
host->h_addr = *sin;
host->h_addr.sin_port = 0; /* ouch! */
host->h_version = version;
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 = server;
- host->h_next = nlm_hosts[hash];
- nlm_hosts[hash] = host;
+ 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);
if (++nrhosts > NLM_HOST_MAX)
next_gc = 0;
-nohost:
+out:
mutex_unlock(&nlm_host_mutex);
return host;
}
-struct nlm_host *
-nlm_find_client(void)
+/*
+ * Destroy a host
+ */
+static void
+nlm_destroy_host(struct nlm_host *host)
{
- /* find a nlm_host for a client for which h_killed == 0.
- * and return it
+ struct rpc_clnt *clnt;
+
+ BUG_ON(!list_empty(&host->h_lockowners));
+ BUG_ON(atomic_read(&host->h_count));
+
+ /*
+ * Release NSM handle and unmonitor host.
*/
- int hash;
- mutex_lock(&nlm_host_mutex);
- for (hash = 0 ; hash < NLM_HOST_NRHASH; hash++) {
- struct nlm_host *host, **hp;
- for (hp = &nlm_hosts[hash]; (host = *hp) != 0; hp = &host->h_next) {
- if (host->h_server &&
- host->h_killed == 0) {
- nlm_get_host(host);
- mutex_unlock(&nlm_host_mutex);
- return host;
- }
+ nsm_unmonitor(host);
+
+ if ((clnt = host->h_rpcclnt) != NULL) {
+ if (atomic_read(&clnt->cl_users)) {
+ printk(KERN_WARNING
+ "lockd: active RPC handle\n");
+ clnt->cl_dead = 1;
+ } else {
+ rpc_destroy_client(host->h_rpcclnt);
}
}
- mutex_unlock(&nlm_host_mutex);
- return NULL;
+ kfree(host);
+}
+
+/*
+ * Find an NLM server handle in the cache. If there is none, create it.
+ */
+struct nlm_host *
+nlmclnt_lookup_host(const struct sockaddr_in *sin, int proto, int version,
+ const char *hostname, int hostname_len)
+{
+ return nlm_lookup_host(0, sin, proto, version,
+ hostname, hostname_len);
+}
+
+/*
+ * Find an NLM client handle in the cache. If there is none, create it.
+ */
+struct nlm_host *
+nlmsvc_lookup_host(struct svc_rqst *rqstp,
+ const char *hostname, int hostname_len)
+{
+ return nlm_lookup_host(1, &rqstp->rq_addr,
+ rqstp->rq_prot, rqstp->rq_vers,
+ hostname, hostname_len);
}
-
/*
* Create the NLM RPC client for an NLM peer
*/
}
}
+/*
+ * We were notified that the host indicated by address &sin
+ * has rebooted.
+ * Release all resources held by that peer.
+ */
+void nlm_host_rebooted(const struct sockaddr_in *sin,
+ const char *hostname, int hostname_len,
+ u32 new_state)
+{
+ struct hlist_head *chain;
+ struct hlist_node *pos;
+ struct nsm_handle *nsm;
+ struct nlm_host *host;
+
+ dprintk("lockd: nlm_host_rebooted(%s, %u.%u.%u.%u)\n",
+ hostname, NIPQUAD(sin->sin_addr));
+
+ /* Find the NSM handle for this peer */
+ if (!(nsm = __nsm_find(sin, hostname, hostname_len, 0)))
+ return;
+
+ /* When reclaiming locks on this peer, make sure that
+ * we set up a new notification */
+ nsm->sm_monitored = 0;
+
+ /* Mark all hosts tied to this NSM state as having rebooted.
+ * We run the loop repeatedly, because we drop the host table
+ * lock for this.
+ * To avoid processing a host several times, we match the nsmstate.
+ */
+again: mutex_lock(&nlm_host_mutex);
+ for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
+ hlist_for_each_entry(host, pos, chain, h_hash) {
+ if (host->h_nsmhandle == nsm
+ && host->h_nsmstate != new_state) {
+ host->h_nsmstate = new_state;
+ host->h_state++;
+
+ nlm_get_host(host);
+ mutex_unlock(&nlm_host_mutex);
+
+ 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);
+ goto again;
+ }
+ }
+ }
+
+ mutex_unlock(&nlm_host_mutex);
+}
+
/*
* Shut down the hosts module.
* Note that this routine is called only at server shutdown time.
void
nlm_shutdown_hosts(void)
{
+ struct hlist_head *chain;
+ struct hlist_node *pos;
struct nlm_host *host;
- int i;
dprintk("lockd: shutting down host module\n");
mutex_lock(&nlm_host_mutex);
/* First, make all hosts eligible for gc */
dprintk("lockd: nuking all hosts...\n");
- for (i = 0; i < NLM_HOST_NRHASH; i++) {
- for (host = nlm_hosts[i]; host; host = host->h_next)
+ for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
+ hlist_for_each_entry(host, pos, chain, h_hash)
host->h_expires = jiffies - 1;
}
if (nrhosts) {
printk(KERN_WARNING "lockd: couldn't shutdown host module!\n");
dprintk("lockd: %d hosts left:\n", nrhosts);
- for (i = 0; i < NLM_HOST_NRHASH; i++) {
- for (host = nlm_hosts[i]; host; host = host->h_next) {
+ for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
+ hlist_for_each_entry(host, pos, chain, h_hash) {
dprintk(" %s (cnt %d use %d exp %ld)\n",
host->h_name, atomic_read(&host->h_count),
host->h_inuse, host->h_expires);
static void
nlm_gc_hosts(void)
{
- struct nlm_host **q, *host;
- struct rpc_clnt *clnt;
- int i;
+ struct hlist_head *chain;
+ struct hlist_node *pos, *next;
+ struct nlm_host *host;
dprintk("lockd: host garbage collection\n");
- for (i = 0; i < NLM_HOST_NRHASH; i++) {
- for (host = nlm_hosts[i]; host; host = host->h_next)
+ for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
+ hlist_for_each_entry(host, pos, chain, h_hash)
host->h_inuse = 0;
}
/* Mark all hosts that hold locks, blocks or shares */
nlmsvc_mark_resources();
- for (i = 0; i < NLM_HOST_NRHASH; i++) {
- q = &nlm_hosts[i];
- while ((host = *q) != NULL) {
+ for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
+ hlist_for_each_entry_safe(host, pos, next, chain, h_hash) {
if (atomic_read(&host->h_count) || host->h_inuse
|| time_before(jiffies, host->h_expires)) {
dprintk("nlm_gc_hosts skipping %s (cnt %d use %d exp %ld)\n",
host->h_name, atomic_read(&host->h_count),
host->h_inuse, host->h_expires);
- q = &host->h_next;
continue;
}
dprintk("lockd: delete host %s\n", host->h_name);
- *q = host->h_next;
- /* Don't unmonitor hosts that have been invalidated */
- if (host->h_monitored && !host->h_killed)
- nsm_unmonitor(host);
- if ((clnt = host->h_rpcclnt) != NULL) {
- if (atomic_read(&clnt->cl_users)) {
- printk(KERN_WARNING
- "lockd: active RPC handle\n");
- clnt->cl_dead = 1;
- } else {
- rpc_destroy_client(host->h_rpcclnt);
- }
- }
- kfree(host);
+ hlist_del_init(&host->h_hash);
+
+ nlm_destroy_host(host);
nrhosts--;
}
}
next_gc = jiffies + NLM_HOST_COLLECT;
}
+
+/*
+ * Manage NSM handles
+ */
+static LIST_HEAD(nsm_handles);
+static DEFINE_MUTEX(nsm_mutex);
+
+static struct nsm_handle *
+__nsm_find(const struct sockaddr_in *sin,
+ const char *hostname, int hostname_len,
+ int create)
+{
+ struct nsm_handle *nsm = NULL;
+ struct list_head *pos;
+
+ if (!sin)
+ return NULL;
+
+ if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
+ if (printk_ratelimit()) {
+ printk(KERN_WARNING "Invalid hostname \"%.*s\" "
+ "in NFS lock request\n",
+ hostname_len, hostname);
+ }
+ return NULL;
+ }
+
+ mutex_lock(&nsm_mutex);
+ list_for_each(pos, &nsm_handles) {
+ nsm = list_entry(pos, struct nsm_handle, sm_link);
+
+ if (hostname && nsm_use_hostnames) {
+ if (strlen(nsm->sm_name) != hostname_len
+ || memcmp(nsm->sm_name, hostname, hostname_len))
+ continue;
+ } else if (!nlm_cmp_addr(&nsm->sm_addr, sin))
+ continue;
+ atomic_inc(&nsm->sm_count);
+ goto out;
+ }
+
+ if (!create) {
+ nsm = NULL;
+ goto out;
+ }
+
+ nsm = kzalloc(sizeof(*nsm) + hostname_len + 1, GFP_KERNEL);
+ if (nsm != NULL) {
+ nsm->sm_addr = *sin;
+ nsm->sm_name = (char *) (nsm + 1);
+ memcpy(nsm->sm_name, hostname, hostname_len);
+ nsm->sm_name[hostname_len] = '\0';
+ atomic_set(&nsm->sm_count, 1);
+
+ list_add(&nsm->sm_link, &nsm_handles);
+ }
+
+out:
+ mutex_unlock(&nsm_mutex);
+ return nsm;
+}
+
+static struct nsm_handle *
+nsm_find(const struct sockaddr_in *sin, const char *hostname, int hostname_len)
+{
+ return __nsm_find(sin, hostname, hostname_len, 1);
+}
+
+/*
+ * Release an NSM handle
+ */
+void
+nsm_release(struct nsm_handle *nsm)
+{
+ if (!nsm)
+ return;
+ if (atomic_dec_and_test(&nsm->sm_count)) {
+ mutex_lock(&nsm_mutex);
+ if (atomic_read(&nsm->sm_count) == 0) {
+ list_del(&nsm->sm_link);
+ kfree(nsm);
+ }
+ mutex_unlock(&nsm_mutex);
+ }
+}
git.openpandora.org / pandora-kernel.git / blobdiff