#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);
static struct nsm_handle * __nsm_find(const struct sockaddr_in *,
const char *, int, int);
-
-/*
- * 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);
-}
+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 *
+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;
+ struct hlist_head *chain;
+ struct hlist_node *pos;
+ struct nlm_host *host;
struct nsm_handle *nsm = NULL;
int hash;
* different NLM rpc_clients into one single nlm_host object.
* This would allow us to have one nlm_host per address.
*/
- for (hp = &nlm_hosts[hash]; (host = *hp) != 0; hp = &host->h_next) {
+ 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) != 0)
- atomic_inc(&nsm->sm_count);
+ if (!nsm)
+ nsm = host->h_nsmhandle;
if (host->h_proto != proto)
continue;
if (host->h_server != server)
continue;
- {
- 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);
+
+ nlm_get_host(host);
+ goto out;
}
+ if (nsm)
+ atomic_inc(&nsm->sm_count);
+
+ host = NULL;
/* Sadly, the host isn't in our hash table yet. See if
* we have an NSM handle for it. If not, create one.
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);
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
*/
* has rebooted.
* Release all resources held by that peer.
*/
-void nlm_host_rebooted(const struct sockaddr_in *sin, const struct nlm_reboot *argp)
+void nlm_host_rebooted(const struct sockaddr_in *sin,
+ const char *hostname, int hostname_len,
+ u32 new_state)
{
- struct nlm_host *host;
- int server;
+ struct hlist_head *chain;
+ struct hlist_node *pos;
+ struct nsm_handle *nsm;
+ struct nlm_host *host;
- /* Obtain the host pointer for this NFS server and try to
- * reclaim all locks we hold on this server.
- */
- server = (argp->proto & 1)? 1 : 0;
- host = nlm_lookup_host(server, sin, argp->proto >> 1, argp->vers,
- argp->mon, argp->len);
- if (host == NULL)
+ 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;
- if (server == 0) {
- /* We are client, he's the server: try to reclaim all locks. */
- nlmclnt_recovery(host, argp->state);
- } else {
- /* He's the client, we're the server: delete all locks held by the client */
- nlmsvc_free_host_resources(host);
+ /* 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;
+ }
+ }
}
- nlm_release_host(host);
+
+ mutex_unlock(&nlm_host_mutex);
}
/*
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;
-
- /*
- * Unmonitor unless host was invalidated (i.e. lockd restarted)
- */
- 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--;
}
}
* Manage NSM handles
*/
static LIST_HEAD(nsm_handles);
-static DECLARE_MUTEX(nsm_sema);
+static DEFINE_MUTEX(nsm_mutex);
static struct nsm_handle *
__nsm_find(const struct sockaddr_in *sin,
return NULL;
}
- down(&nsm_sema);
+ mutex_lock(&nsm_mutex);
list_for_each(pos, &nsm_handles) {
nsm = list_entry(pos, struct nsm_handle, sm_link);
- if (!nlm_cmp_addr(&nsm->sm_addr, sin))
+ 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;
list_add(&nsm->sm_link, &nsm_handles);
}
-out: up(&nsm_sema);
+out:
+ mutex_unlock(&nsm_mutex);
return nsm;
}
-struct nsm_handle *
+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);
if (!nsm)
return;
if (atomic_dec_and_test(&nsm->sm_count)) {
- down(&nsm_sema);
+ mutex_lock(&nsm_mutex);
if (atomic_read(&nsm->sm_count) == 0) {
list_del(&nsm->sm_link);
kfree(nsm);
}
- up(&nsm_sema);
+ mutex_unlock(&nsm_mutex);
}
}
git.openpandora.org / pandora-kernel.git / blobdiff