sunrpc: Make the ip_map_cache be per-net

Everything that is required for that already exists:
* the per-net cache registration with respective proc entries
* the context (struct net) is available in all the users

Signed-off-by: Pavel Emelyanov <[e-mail]>
Signed-off-by: J. Bruce Fields <[e-mail]>

net/sunrpc/netns.h

···
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
 
+struct cache_detail;
+
 struct sunrpc_net {
 	struct proc_dir_entry *proc_net_rpc;
+	struct cache_detail *ip_map_cache;
 };
 
 extern int sunrpc_net_id;
+
+int ip_map_cache_create(struct net *);
+void ip_map_cache_destroy(struct net *);
 
 #endif

net/sunrpc/sunrpc_syms.c

···
 	if (err)
 		goto err_proc;
 
+	err = ip_map_cache_create(net);
+	if (err)
+		goto err_ipmap;
+
 	return 0;
 
+err_ipmap:
+	rpc_proc_exit(net);
 err_proc:
 	return err;
 }
 
 static __net_exit void sunrpc_exit_net(struct net *net)
 {
+	ip_map_cache_destroy(net);
 	rpc_proc_exit(net);
 }
 
···
 	.size = sizeof(struct sunrpc_net),
 };
 
-extern struct cache_detail ip_map_cache, unix_gid_cache;
+extern struct cache_detail unix_gid_cache;
 
 extern void cleanup_rpcb_clnt(void);
 
···
 #ifdef RPC_DEBUG
 	rpc_register_sysctl();
 #endif
-	cache_register(&ip_map_cache);
 	cache_register(&unix_gid_cache);
 	svc_init_xprt_sock();	/* svc sock transport */
 	init_socket_xprt();	/* clnt sock transport */
···
 	svc_cleanup_xprt_sock();
 	unregister_rpc_pipefs();
 	rpc_destroy_mempool();
-	cache_unregister(&ip_map_cache);
 	cache_unregister(&unix_gid_cache);
 	unregister_pernet_subsys(&sunrpc_net_ops);
 #ifdef RPC_DEBUG

net/sunrpc/svcauth_unix.c

···
 
 #include <linux/sunrpc/clnt.h>
 
+#include "netns.h"
+
 /*
  * AUTHUNIX and AUTHNULL credentials are both handled here.
  * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
···
 	struct unix_domain	*m_client;
 	int			m_add_change;
 };
-static struct cache_head	*ip_table[IP_HASHMAX];
 
 static void ip_map_put(struct kref *kref)
 {
···
 }
 
 
-struct cache_detail ip_map_cache = {
-	.owner		= THIS_MODULE,
-	.hash_size	= IP_HASHMAX,
-	.hash_table	= ip_table,
-	.name		= "auth.unix.ip",
-	.cache_put	= ip_map_put,
-	.cache_upcall	= ip_map_upcall,
-	.cache_parse	= ip_map_parse,
-	.cache_show	= ip_map_show,
-	.match		= ip_map_match,
-	.init		= ip_map_init,
-	.update		= update,
-	.alloc		= ip_map_alloc,
-};
-
 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
 		struct in6_addr *addr)
 {
···
 static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
 		struct in6_addr *addr)
 {
-	return __ip_map_lookup(&ip_map_cache, class, addr);
+	struct sunrpc_net *sn;
+
+	sn = net_generic(net, sunrpc_net_id);
+	return __ip_map_lookup(sn->ip_map_cache, class, addr);
 }
 
 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
···
 static inline int ip_map_update(struct net *net, struct ip_map *ipm,
 		struct unix_domain *udom, time_t expiry)
 {
-	return __ip_map_update(&ip_map_cache, ipm, udom, expiry);
+	struct sunrpc_net *sn;
+
+	sn = net_generic(net, sunrpc_net_id);
+	return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
 }
 
 int auth_unix_add_addr(struct net *net, struct in6_addr *addr, struct auth_domain *dom)
···
 {
 	struct ip_map *ipm;
 	struct auth_domain *rv;
+	struct sunrpc_net *sn;
 
+	sn = net_generic(net, sunrpc_net_id);
 	ipm = ip_map_lookup(net, "nfsd", addr);
 
 	if (!ipm)
 		return NULL;
-	if (cache_check(&ip_map_cache, &ipm->h, NULL))
+	if (cache_check(sn->ip_map_cache, &ipm->h, NULL))
 		return NULL;
 
 	if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
···
 		rv = &ipm->m_client->h;
 		kref_get(&rv->ref);
 	}
-	cache_put(&ipm->h, &ip_map_cache);
+	cache_put(&ipm->h, sn->ip_map_cache);
 	return rv;
 }
 EXPORT_SYMBOL_GPL(auth_unix_lookup);
 
 void svcauth_unix_purge(void)
 {
-	cache_purge(&ip_map_cache);
+	struct net *net;
+
+	for_each_net(net) {
+		struct sunrpc_net *sn;
+
+		sn = net_generic(net, sunrpc_net_id);
+		cache_purge(sn->ip_map_cache);
+	}
 }
 EXPORT_SYMBOL_GPL(svcauth_unix_purge);
 
···
 ip_map_cached_get(struct svc_xprt *xprt)
 {
 	struct ip_map *ipm = NULL;
+	struct sunrpc_net *sn;
 
 	if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
 		spin_lock(&xprt->xpt_lock);
···
 				 * remembered, e.g. by a second mount from the
 				 * same IP address.
 				 */
+				sn = net_generic(xprt->xpt_net, sunrpc_net_id);
 				xprt->xpt_auth_cache = NULL;
 				spin_unlock(&xprt->xpt_lock);
-				cache_put(&ipm->h, &ip_map_cache);
+				cache_put(&ipm->h, sn->ip_map_cache);
 				return NULL;
 			}
 			cache_get(&ipm->h);
···
 		}
 		spin_unlock(&xprt->xpt_lock);
 	}
-	if (ipm)
-		cache_put(&ipm->h, &ip_map_cache);
+	if (ipm) {
+		struct sunrpc_net *sn;
+
+		sn = net_generic(xprt->xpt_net, sunrpc_net_id);
+		cache_put(&ipm->h, sn->ip_map_cache);
+	}
 }
 
 void
···
 	struct ip_map *ipm;
 
 	ipm = xpt->xpt_auth_cache;
-	if (ipm != NULL)
-		cache_put(&ipm->h, &ip_map_cache);
+	if (ipm != NULL) {
+		struct sunrpc_net *sn;
+
+		sn = net_generic(xpt->xpt_net, sunrpc_net_id);
+		cache_put(&ipm->h, sn->ip_map_cache);
+	}
 }
 
 /****************************************************************************
···
 	struct group_info *gi;
 	struct svc_cred *cred = &rqstp->rq_cred;
 	struct svc_xprt *xprt = rqstp->rq_xprt;
+	struct net *net = xprt->xpt_net;
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 
 	switch (rqstp->rq_addr.ss_family) {
 	case AF_INET:
···
 
 	ipm = ip_map_cached_get(xprt);
 	if (ipm == NULL)
-		ipm = ip_map_lookup(&init_net, rqstp->rq_server->sv_program->pg_class,
+		ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
 				    &sin6->sin6_addr);
 
 	if (ipm == NULL)
 		return SVC_DENIED;
 
-	switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
+	switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
 		default:
 			BUG();
 		case -ETIMEDOUT:
···
 	.set_client	= svcauth_unix_set_client,
 };
 
+int ip_map_cache_create(struct net *net)
+{
+	int err = -ENOMEM;
+	struct cache_detail *cd;
+	struct cache_head **tbl;
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	cd = kzalloc(sizeof(struct cache_detail), GFP_KERNEL);
+	if (cd == NULL)
+		goto err_cd;
+
+	tbl = kzalloc(IP_HASHMAX * sizeof(struct cache_head *), GFP_KERNEL);
+	if (tbl == NULL)
+		goto err_tbl;
+
+	cd->owner = THIS_MODULE,
+	cd->hash_size = IP_HASHMAX,
+	cd->hash_table = tbl,
+	cd->name = "auth.unix.ip",
+	cd->cache_put = ip_map_put,
+	cd->cache_upcall = ip_map_upcall,
+	cd->cache_parse = ip_map_parse,
+	cd->cache_show = ip_map_show,
+	cd->match = ip_map_match,
+	cd->init = ip_map_init,
+	cd->update = update,
+	cd->alloc = ip_map_alloc,
+
+	err = cache_register_net(cd, net);
+	if (err)
+		goto err_reg;
+
+	sn->ip_map_cache = cd;
+	return 0;
+
+err_reg:
+	kfree(tbl);
+err_tbl:
+	kfree(cd);
+err_cd:
+	return err;
+}
+
+void ip_map_cache_destroy(struct net *net)
+{
+	struct sunrpc_net *sn;
+
+	sn = net_generic(net, sunrpc_net_id);
+	cache_purge(sn->ip_map_cache);
+	cache_unregister_net(sn->ip_map_cache, net);
+	kfree(sn->ip_map_cache->hash_table);
+	kfree(sn->ip_map_cache);
+}