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[PATCH] knfsd: lockd: make the hash chains use a hlist_node
Get rid of the home-grown singly linked lists for the nlm_host hash table. Signed-off-by: Olaf Kirch <okir@suse.de> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
parent
9502c52259
commit
0cea32761a
2 changed files with 40 additions and 33 deletions
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@ -27,7 +27,7 @@
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#define NLM_HOST_EXPIRE ((nrhosts > NLM_HOST_MAX)? 300 * HZ : 120 * HZ)
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#define NLM_HOST_COLLECT ((nrhosts > NLM_HOST_MAX)? 120 * HZ : 60 * HZ)
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static struct nlm_host * nlm_hosts[NLM_HOST_NRHASH];
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static struct hlist_head nlm_hosts[NLM_HOST_NRHASH];
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static unsigned long next_gc;
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static int nrhosts;
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static DEFINE_MUTEX(nlm_host_mutex);
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@ -69,7 +69,9 @@ nlm_lookup_host(int server, const struct sockaddr_in *sin,
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const char *hostname,
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int hostname_len)
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{
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struct nlm_host *host, **hp;
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struct hlist_head *chain;
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struct hlist_node *pos;
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struct nlm_host *host;
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struct nsm_handle *nsm = NULL;
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int hash;
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@ -95,7 +97,8 @@ nlm_lookup_host(int server, const struct sockaddr_in *sin,
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* different NLM rpc_clients into one single nlm_host object.
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* This would allow us to have one nlm_host per address.
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*/
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for (hp = &nlm_hosts[hash]; (host = *hp) != 0; hp = &host->h_next) {
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chain = &nlm_hosts[hash];
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hlist_for_each_entry(host, pos, chain, h_hash) {
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if (!nlm_cmp_addr(&host->h_addr, sin))
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continue;
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@ -110,15 +113,16 @@ nlm_lookup_host(int server, const struct sockaddr_in *sin,
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if (host->h_server != server)
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continue;
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if (hp != nlm_hosts + hash) {
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*hp = host->h_next;
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host->h_next = nlm_hosts[hash];
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nlm_hosts[hash] = host;
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}
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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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goto out;
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}
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host = NULL;
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/* Sadly, the host isn't in our hash table yet. See if
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* we have an NSM handle for it. If not, create one.
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*/
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@ -146,8 +150,7 @@ nlm_lookup_host(int server, const struct sockaddr_in *sin,
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host->h_nsmstate = 0; /* real NSM state */
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host->h_nsmhandle = nsm;
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host->h_server = server;
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host->h_next = nlm_hosts[hash];
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nlm_hosts[hash] = host;
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hlist_add_head(&host->h_hash, chain);
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INIT_LIST_HEAD(&host->h_lockowners);
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spin_lock_init(&host->h_lock);
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INIT_LIST_HEAD(&host->h_granted);
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@ -164,14 +167,17 @@ nlm_lookup_host(int server, const struct sockaddr_in *sin,
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struct nlm_host *
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nlm_find_client(void)
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{
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struct hlist_head *chain;
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struct hlist_node *pos;
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/* find a nlm_host for a client for which h_killed == 0.
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* and return it
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*/
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int hash;
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mutex_lock(&nlm_host_mutex);
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for (hash = 0 ; hash < NLM_HOST_NRHASH; hash++) {
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struct nlm_host *host, **hp;
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for (hp = &nlm_hosts[hash]; (host = *hp) != 0; hp = &host->h_next) {
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for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
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struct nlm_host *host;
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hlist_for_each_entry(host, pos, chain, h_hash) {
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if (host->h_server &&
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host->h_killed == 0) {
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nlm_get_host(host);
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@ -294,9 +300,10 @@ void nlm_host_rebooted(const struct sockaddr_in *sin,
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const char *hostname, int hostname_len,
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u32 new_state)
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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 nsm_handle *nsm;
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struct nlm_host *host, **hp;
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int hash;
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struct nlm_host *host;
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dprintk("lockd: nlm_host_rebooted(%s, %u.%u.%u.%u)\n",
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hostname, NIPQUAD(sin->sin_addr));
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@ -315,8 +322,8 @@ void nlm_host_rebooted(const struct sockaddr_in *sin,
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* To avoid processing a host several times, we match the nsmstate.
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*/
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again: mutex_lock(&nlm_host_mutex);
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for (hash = 0; hash < NLM_HOST_NRHASH; hash++) {
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for (hp = &nlm_hosts[hash]; (host = *hp); hp = &host->h_next) {
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for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
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hlist_for_each_entry(host, pos, chain, h_hash) {
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if (host->h_nsmhandle == nsm
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&& host->h_nsmstate != new_state) {
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host->h_nsmstate = new_state;
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@ -350,16 +357,17 @@ again: mutex_lock(&nlm_host_mutex);
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void
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nlm_shutdown_hosts(void)
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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;
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int i;
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dprintk("lockd: shutting down host module\n");
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mutex_lock(&nlm_host_mutex);
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/* First, make all hosts eligible for gc */
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dprintk("lockd: nuking all hosts...\n");
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for (i = 0; i < NLM_HOST_NRHASH; i++) {
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for (host = nlm_hosts[i]; host; host = host->h_next)
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for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
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hlist_for_each_entry(host, pos, chain, h_hash)
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host->h_expires = jiffies - 1;
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}
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@ -371,8 +379,8 @@ nlm_shutdown_hosts(void)
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if (nrhosts) {
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printk(KERN_WARNING "lockd: couldn't shutdown host module!\n");
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dprintk("lockd: %d hosts left:\n", nrhosts);
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for (i = 0; i < NLM_HOST_NRHASH; i++) {
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for (host = nlm_hosts[i]; host; host = host->h_next) {
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for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
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hlist_for_each_entry(host, pos, chain, h_hash) {
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dprintk(" %s (cnt %d use %d exp %ld)\n",
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host->h_name, atomic_read(&host->h_count),
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host->h_inuse, host->h_expires);
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@ -389,32 +397,31 @@ nlm_shutdown_hosts(void)
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static void
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nlm_gc_hosts(void)
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{
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struct nlm_host **q, *host;
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struct hlist_head *chain;
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struct hlist_node *pos, *next;
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struct nlm_host *host;
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struct rpc_clnt *clnt;
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int i;
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dprintk("lockd: host garbage collection\n");
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for (i = 0; i < NLM_HOST_NRHASH; i++) {
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for (host = nlm_hosts[i]; host; host = host->h_next)
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for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
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hlist_for_each_entry(host, pos, chain, h_hash)
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host->h_inuse = 0;
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}
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/* Mark all hosts that hold locks, blocks or shares */
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nlmsvc_mark_resources();
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for (i = 0; i < NLM_HOST_NRHASH; i++) {
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q = &nlm_hosts[i];
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while ((host = *q) != NULL) {
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for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
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hlist_for_each_entry_safe(host, pos, next, chain, h_hash) {
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if (atomic_read(&host->h_count) || host->h_inuse
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|| time_before(jiffies, host->h_expires)) {
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dprintk("nlm_gc_hosts skipping %s (cnt %d use %d exp %ld)\n",
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host->h_name, atomic_read(&host->h_count),
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host->h_inuse, host->h_expires);
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q = &host->h_next;
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continue;
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}
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dprintk("lockd: delete host %s\n", host->h_name);
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*q = host->h_next;
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hlist_del_init(&host->h_hash);
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/*
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* Unmonitor unless host was invalidated (i.e. lockd restarted)
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@ -37,7 +37,7 @@
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* Lockd host handle (used both by the client and server personality).
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*/
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struct nlm_host {
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struct nlm_host * h_next; /* linked list (hash table) */
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struct hlist_node h_hash; /* doubly linked list */
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struct sockaddr_in h_addr; /* peer address */
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struct rpc_clnt * h_rpcclnt; /* RPC client to talk to peer */
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char * h_name; /* remote hostname */
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