Expand the rq_addr field to allow it to contain larger addresses. Specifically, we replace a 'sockaddr_in' with a 'sockaddr_storage', then everywhere the 'sockaddr_in' was referenced, we use instead an accessor function (svc_addr_in) which safely casts the _storage to _in. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Cc: Aurelien Charbon <aurelien.charbon@ext.bull.net> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
523 lines
13 KiB
C
523 lines
13 KiB
C
/*
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* linux/fs/lockd/host.c
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*
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* Management for NLM peer hosts. The nlm_host struct is shared
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* between client and server implementation. The only reason to
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* do so is to reduce code bloat.
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/in.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/lockd/lockd.h>
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#include <linux/lockd/sm_inter.h>
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#include <linux/mutex.h>
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#define NLMDBG_FACILITY NLMDBG_HOSTCACHE
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#define NLM_HOST_MAX 64
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#define NLM_HOST_NRHASH 32
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#define NLM_ADDRHASH(addr) (ntohl(addr) & (NLM_HOST_NRHASH-1))
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#define NLM_HOST_REBIND (60 * HZ)
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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 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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static void nlm_gc_hosts(void);
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static struct nsm_handle * __nsm_find(const struct sockaddr_in *,
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const char *, int, int);
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static struct nsm_handle * nsm_find(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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* Common host lookup routine for server & client
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*/
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static struct nlm_host *
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nlm_lookup_host(int server, const struct sockaddr_in *sin,
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int proto, int version,
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const char *hostname,
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int hostname_len)
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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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struct nsm_handle *nsm = NULL;
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int hash;
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dprintk("lockd: nlm_lookup_host(%u.%u.%u.%u, p=%d, v=%d, my role=%s, name=%.*s)\n",
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NIPQUAD(sin->sin_addr.s_addr), proto, version,
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server? "server" : "client",
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hostname_len,
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hostname? hostname : "<none>");
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hash = NLM_ADDRHASH(sin->sin_addr.s_addr);
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/* Lock hash table */
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mutex_lock(&nlm_host_mutex);
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if (time_after_eq(jiffies, next_gc))
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nlm_gc_hosts();
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/* We may keep several nlm_host objects for a peer, because each
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* nlm_host is identified by
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* (address, protocol, version, server/client)
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* We could probably simplify this a little by putting all those
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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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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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/* See if we have an NSM handle for this client */
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if (!nsm)
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nsm = host->h_nsmhandle;
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if (host->h_proto != proto)
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continue;
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if (host->h_version != version)
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continue;
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if (host->h_server != server)
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continue;
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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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if (nsm)
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atomic_inc(&nsm->sm_count);
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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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if (!nsm && !(nsm = nsm_find(sin, hostname, hostname_len)))
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goto out;
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host = kzalloc(sizeof(*host), GFP_KERNEL);
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if (!host) {
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nsm_release(nsm);
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goto out;
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}
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host->h_name = nsm->sm_name;
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host->h_addr = *sin;
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host->h_addr.sin_port = 0; /* ouch! */
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host->h_version = version;
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host->h_proto = proto;
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host->h_rpcclnt = NULL;
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mutex_init(&host->h_mutex);
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host->h_nextrebind = jiffies + NLM_HOST_REBIND;
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host->h_expires = jiffies + NLM_HOST_EXPIRE;
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atomic_set(&host->h_count, 1);
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init_waitqueue_head(&host->h_gracewait);
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init_rwsem(&host->h_rwsem);
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host->h_state = 0; /* pseudo NSM state */
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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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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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INIT_LIST_HEAD(&host->h_reclaim);
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if (++nrhosts > NLM_HOST_MAX)
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next_gc = 0;
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out:
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mutex_unlock(&nlm_host_mutex);
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return host;
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}
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/*
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* Destroy a host
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*/
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static void
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nlm_destroy_host(struct nlm_host *host)
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{
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struct rpc_clnt *clnt;
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BUG_ON(!list_empty(&host->h_lockowners));
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BUG_ON(atomic_read(&host->h_count));
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/*
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* Release NSM handle and unmonitor host.
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*/
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nsm_unmonitor(host);
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if ((clnt = host->h_rpcclnt) != NULL) {
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if (atomic_read(&clnt->cl_users)) {
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printk(KERN_WARNING
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"lockd: active RPC handle\n");
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clnt->cl_dead = 1;
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} else {
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rpc_destroy_client(host->h_rpcclnt);
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}
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}
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kfree(host);
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}
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/*
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* Find an NLM server handle in the cache. If there is none, create it.
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*/
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struct nlm_host *
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nlmclnt_lookup_host(const struct sockaddr_in *sin, int proto, int version,
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const char *hostname, int hostname_len)
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{
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return nlm_lookup_host(0, sin, proto, version,
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hostname, hostname_len);
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}
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/*
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* Find an NLM client handle in the cache. If there is none, create it.
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*/
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struct nlm_host *
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nlmsvc_lookup_host(struct svc_rqst *rqstp,
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const char *hostname, int hostname_len)
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{
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return nlm_lookup_host(1, svc_addr_in(rqstp),
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rqstp->rq_prot, rqstp->rq_vers,
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hostname, hostname_len);
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}
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/*
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* Create the NLM RPC client for an NLM peer
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*/
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struct rpc_clnt *
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nlm_bind_host(struct nlm_host *host)
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{
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struct rpc_clnt *clnt;
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dprintk("lockd: nlm_bind_host(%08x)\n",
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(unsigned)ntohl(host->h_addr.sin_addr.s_addr));
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/* Lock host handle */
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mutex_lock(&host->h_mutex);
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/* If we've already created an RPC client, check whether
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* RPC rebind is required
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*/
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if ((clnt = host->h_rpcclnt) != NULL) {
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if (time_after_eq(jiffies, host->h_nextrebind)) {
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rpc_force_rebind(clnt);
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host->h_nextrebind = jiffies + NLM_HOST_REBIND;
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dprintk("lockd: next rebind in %ld jiffies\n",
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host->h_nextrebind - jiffies);
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}
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} else {
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unsigned long increment = nlmsvc_timeout * HZ;
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struct rpc_timeout timeparms = {
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.to_initval = increment,
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.to_increment = increment,
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.to_maxval = increment * 6UL,
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.to_retries = 5U,
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};
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struct rpc_create_args args = {
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.protocol = host->h_proto,
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.address = (struct sockaddr *)&host->h_addr,
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.addrsize = sizeof(host->h_addr),
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.timeout = &timeparms,
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.servername = host->h_name,
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.program = &nlm_program,
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.version = host->h_version,
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.authflavor = RPC_AUTH_UNIX,
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.flags = (RPC_CLNT_CREATE_HARDRTRY |
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RPC_CLNT_CREATE_AUTOBIND),
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};
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clnt = rpc_create(&args);
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if (!IS_ERR(clnt))
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host->h_rpcclnt = clnt;
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else {
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printk("lockd: couldn't create RPC handle for %s\n", host->h_name);
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clnt = NULL;
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}
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}
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mutex_unlock(&host->h_mutex);
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return clnt;
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}
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/*
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* Force a portmap lookup of the remote lockd port
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*/
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void
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nlm_rebind_host(struct nlm_host *host)
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{
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dprintk("lockd: rebind host %s\n", host->h_name);
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if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) {
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rpc_force_rebind(host->h_rpcclnt);
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host->h_nextrebind = jiffies + NLM_HOST_REBIND;
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}
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}
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/*
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* Increment NLM host count
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*/
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struct nlm_host * nlm_get_host(struct nlm_host *host)
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{
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if (host) {
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dprintk("lockd: get host %s\n", host->h_name);
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atomic_inc(&host->h_count);
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host->h_expires = jiffies + NLM_HOST_EXPIRE;
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}
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return host;
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}
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/*
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* Release NLM host after use
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*/
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void nlm_release_host(struct nlm_host *host)
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{
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if (host != NULL) {
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dprintk("lockd: release host %s\n", host->h_name);
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BUG_ON(atomic_read(&host->h_count) < 0);
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if (atomic_dec_and_test(&host->h_count)) {
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BUG_ON(!list_empty(&host->h_lockowners));
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BUG_ON(!list_empty(&host->h_granted));
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BUG_ON(!list_empty(&host->h_reclaim));
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}
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}
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}
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/*
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* We were notified that the host indicated by address &sin
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* has rebooted.
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* Release all resources held by that peer.
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*/
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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;
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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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/* Find the NSM handle for this peer */
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if (!(nsm = __nsm_find(sin, hostname, hostname_len, 0)))
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return;
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/* When reclaiming locks on this peer, make sure that
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* we set up a new notification */
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nsm->sm_monitored = 0;
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/* Mark all hosts tied to this NSM state as having rebooted.
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* We run the loop repeatedly, because we drop the host table
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* lock for this.
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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 (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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host->h_state++;
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nlm_get_host(host);
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mutex_unlock(&nlm_host_mutex);
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if (host->h_server) {
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/* We're server for this guy, just ditch
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* all the locks he held. */
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nlmsvc_free_host_resources(host);
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} else {
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/* He's the server, initiate lock recovery. */
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nlmclnt_recovery(host);
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}
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nlm_release_host(host);
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goto again;
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}
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}
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}
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mutex_unlock(&nlm_host_mutex);
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}
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/*
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* Shut down the hosts module.
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* Note that this routine is called only at server shutdown time.
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*/
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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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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 (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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/* Then, perform a garbage collection pass */
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nlm_gc_hosts();
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mutex_unlock(&nlm_host_mutex);
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/* complain if any hosts are left */
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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 (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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}
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}
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}
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}
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/*
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* Garbage collect any unused NLM hosts.
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* This GC combines reference counting for async operations with
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* mark & sweep for resources held by remote clients.
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*/
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static void
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nlm_gc_hosts(void)
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{
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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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dprintk("lockd: host garbage collection\n");
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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 (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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continue;
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}
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dprintk("lockd: delete host %s\n", host->h_name);
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hlist_del_init(&host->h_hash);
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nlm_destroy_host(host);
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nrhosts--;
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}
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}
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next_gc = jiffies + NLM_HOST_COLLECT;
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}
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/*
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* Manage NSM handles
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*/
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static LIST_HEAD(nsm_handles);
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static DEFINE_MUTEX(nsm_mutex);
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static struct nsm_handle *
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__nsm_find(const struct sockaddr_in *sin,
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const char *hostname, int hostname_len,
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int create)
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{
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struct nsm_handle *nsm = NULL;
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struct list_head *pos;
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if (!sin)
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return NULL;
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if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
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if (printk_ratelimit()) {
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printk(KERN_WARNING "Invalid hostname \"%.*s\" "
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"in NFS lock request\n",
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hostname_len, hostname);
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}
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return NULL;
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}
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mutex_lock(&nsm_mutex);
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list_for_each(pos, &nsm_handles) {
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nsm = list_entry(pos, struct nsm_handle, sm_link);
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if (hostname && nsm_use_hostnames) {
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if (strlen(nsm->sm_name) != hostname_len
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|| memcmp(nsm->sm_name, hostname, hostname_len))
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continue;
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} else if (!nlm_cmp_addr(&nsm->sm_addr, sin))
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continue;
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atomic_inc(&nsm->sm_count);
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goto out;
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}
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if (!create) {
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nsm = NULL;
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goto out;
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}
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nsm = kzalloc(sizeof(*nsm) + hostname_len + 1, GFP_KERNEL);
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if (nsm != NULL) {
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nsm->sm_addr = *sin;
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nsm->sm_name = (char *) (nsm + 1);
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memcpy(nsm->sm_name, hostname, hostname_len);
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nsm->sm_name[hostname_len] = '\0';
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atomic_set(&nsm->sm_count, 1);
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list_add(&nsm->sm_link, &nsm_handles);
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}
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out:
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mutex_unlock(&nsm_mutex);
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return nsm;
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}
|
|
|
|
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);
|
|
}
|
|
}
|