11d8206b9STom Tucker /* 21d8206b9STom Tucker * linux/net/sunrpc/svc_xprt.c 31d8206b9STom Tucker * 41d8206b9STom Tucker * Author: Tom Tucker <tom@opengridcomputing.com> 51d8206b9STom Tucker */ 61d8206b9STom Tucker 71d8206b9STom Tucker #include <linux/sched.h> 81d8206b9STom Tucker #include <linux/errno.h> 91d8206b9STom Tucker #include <linux/freezer.h> 107086721fSJeff Layton #include <linux/kthread.h> 115a0e3ad6STejun Heo #include <linux/slab.h> 121d8206b9STom Tucker #include <net/sock.h> 131d8206b9STom Tucker #include <linux/sunrpc/stats.h> 141d8206b9STom Tucker #include <linux/sunrpc/svc_xprt.h> 15dcf1a357SH Hartley Sweeten #include <linux/sunrpc/svcsock.h> 1699de8ea9SJ. Bruce Fields #include <linux/sunrpc/xprt.h> 173a9a231dSPaul Gortmaker #include <linux/module.h> 181d8206b9STom Tucker 191d8206b9STom Tucker #define RPCDBG_FACILITY RPCDBG_SVCXPRT 201d8206b9STom Tucker 210f0257eaSTom Tucker static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt); 220f0257eaSTom Tucker static int svc_deferred_recv(struct svc_rqst *rqstp); 230f0257eaSTom Tucker static struct cache_deferred_req *svc_defer(struct cache_req *req); 240f0257eaSTom Tucker static void svc_age_temp_xprts(unsigned long closure); 257710ec36SJ. Bruce Fields static void svc_delete_xprt(struct svc_xprt *xprt); 260f0257eaSTom Tucker 270f0257eaSTom Tucker /* apparently the "standard" is that clients close 280f0257eaSTom Tucker * idle connections after 5 minutes, servers after 290f0257eaSTom Tucker * 6 minutes 300f0257eaSTom Tucker * http://www.connectathon.org/talks96/nfstcp.pdf 310f0257eaSTom Tucker */ 320f0257eaSTom Tucker static int svc_conn_age_period = 6*60; 330f0257eaSTom Tucker 341d8206b9STom Tucker /* List of registered transport classes */ 351d8206b9STom Tucker static DEFINE_SPINLOCK(svc_xprt_class_lock); 361d8206b9STom Tucker static LIST_HEAD(svc_xprt_class_list); 371d8206b9STom Tucker 380f0257eaSTom Tucker /* SMP locking strategy: 390f0257eaSTom Tucker * 400f0257eaSTom Tucker * svc_pool->sp_lock protects most of the fields of that pool. 410f0257eaSTom Tucker * svc_serv->sv_lock protects sv_tempsocks, sv_permsocks, sv_tmpcnt. 420f0257eaSTom Tucker * when both need to be taken (rare), svc_serv->sv_lock is first. 430f0257eaSTom Tucker * BKL protects svc_serv->sv_nrthread. 440f0257eaSTom Tucker * svc_sock->sk_lock protects the svc_sock->sk_deferred list 450f0257eaSTom Tucker * and the ->sk_info_authunix cache. 460f0257eaSTom Tucker * 470f0257eaSTom Tucker * The XPT_BUSY bit in xprt->xpt_flags prevents a transport being 480f0257eaSTom Tucker * enqueued multiply. During normal transport processing this bit 490f0257eaSTom Tucker * is set by svc_xprt_enqueue and cleared by svc_xprt_received. 500f0257eaSTom Tucker * Providers should not manipulate this bit directly. 510f0257eaSTom Tucker * 520f0257eaSTom Tucker * Some flags can be set to certain values at any time 530f0257eaSTom Tucker * providing that certain rules are followed: 540f0257eaSTom Tucker * 550f0257eaSTom Tucker * XPT_CONN, XPT_DATA: 560f0257eaSTom Tucker * - Can be set or cleared at any time. 570f0257eaSTom Tucker * - After a set, svc_xprt_enqueue must be called to enqueue 580f0257eaSTom Tucker * the transport for processing. 590f0257eaSTom Tucker * - After a clear, the transport must be read/accepted. 600f0257eaSTom Tucker * If this succeeds, it must be set again. 610f0257eaSTom Tucker * XPT_CLOSE: 620f0257eaSTom Tucker * - Can set at any time. It is never cleared. 630f0257eaSTom Tucker * XPT_DEAD: 640f0257eaSTom Tucker * - Can only be set while XPT_BUSY is held which ensures 650f0257eaSTom Tucker * that no other thread will be using the transport or will 660f0257eaSTom Tucker * try to set XPT_DEAD. 670f0257eaSTom Tucker */ 680f0257eaSTom Tucker 691d8206b9STom Tucker int svc_reg_xprt_class(struct svc_xprt_class *xcl) 701d8206b9STom Tucker { 711d8206b9STom Tucker struct svc_xprt_class *cl; 721d8206b9STom Tucker int res = -EEXIST; 731d8206b9STom Tucker 741d8206b9STom Tucker dprintk("svc: Adding svc transport class '%s'\n", xcl->xcl_name); 751d8206b9STom Tucker 761d8206b9STom Tucker INIT_LIST_HEAD(&xcl->xcl_list); 771d8206b9STom Tucker spin_lock(&svc_xprt_class_lock); 781d8206b9STom Tucker /* Make sure there isn't already a class with the same name */ 791d8206b9STom Tucker list_for_each_entry(cl, &svc_xprt_class_list, xcl_list) { 801d8206b9STom Tucker if (strcmp(xcl->xcl_name, cl->xcl_name) == 0) 811d8206b9STom Tucker goto out; 821d8206b9STom Tucker } 831d8206b9STom Tucker list_add_tail(&xcl->xcl_list, &svc_xprt_class_list); 841d8206b9STom Tucker res = 0; 851d8206b9STom Tucker out: 861d8206b9STom Tucker spin_unlock(&svc_xprt_class_lock); 871d8206b9STom Tucker return res; 881d8206b9STom Tucker } 891d8206b9STom Tucker EXPORT_SYMBOL_GPL(svc_reg_xprt_class); 901d8206b9STom Tucker 911d8206b9STom Tucker void svc_unreg_xprt_class(struct svc_xprt_class *xcl) 921d8206b9STom Tucker { 931d8206b9STom Tucker dprintk("svc: Removing svc transport class '%s'\n", xcl->xcl_name); 941d8206b9STom Tucker spin_lock(&svc_xprt_class_lock); 951d8206b9STom Tucker list_del_init(&xcl->xcl_list); 961d8206b9STom Tucker spin_unlock(&svc_xprt_class_lock); 971d8206b9STom Tucker } 981d8206b9STom Tucker EXPORT_SYMBOL_GPL(svc_unreg_xprt_class); 991d8206b9STom Tucker 100dc9a16e4STom Tucker /* 101dc9a16e4STom Tucker * Format the transport list for printing 102dc9a16e4STom Tucker */ 103dc9a16e4STom Tucker int svc_print_xprts(char *buf, int maxlen) 104dc9a16e4STom Tucker { 1058f3a6de3SPavel Emelyanov struct svc_xprt_class *xcl; 106dc9a16e4STom Tucker char tmpstr[80]; 107dc9a16e4STom Tucker int len = 0; 108dc9a16e4STom Tucker buf[0] = '\0'; 109dc9a16e4STom Tucker 110dc9a16e4STom Tucker spin_lock(&svc_xprt_class_lock); 1118f3a6de3SPavel Emelyanov list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) { 112dc9a16e4STom Tucker int slen; 113dc9a16e4STom Tucker 114dc9a16e4STom Tucker sprintf(tmpstr, "%s %d\n", xcl->xcl_name, xcl->xcl_max_payload); 115dc9a16e4STom Tucker slen = strlen(tmpstr); 116dc9a16e4STom Tucker if (len + slen > maxlen) 117dc9a16e4STom Tucker break; 118dc9a16e4STom Tucker len += slen; 119dc9a16e4STom Tucker strcat(buf, tmpstr); 120dc9a16e4STom Tucker } 121dc9a16e4STom Tucker spin_unlock(&svc_xprt_class_lock); 122dc9a16e4STom Tucker 123dc9a16e4STom Tucker return len; 124dc9a16e4STom Tucker } 125dc9a16e4STom Tucker 126e1b3157fSTom Tucker static void svc_xprt_free(struct kref *kref) 127e1b3157fSTom Tucker { 128e1b3157fSTom Tucker struct svc_xprt *xprt = 129e1b3157fSTom Tucker container_of(kref, struct svc_xprt, xpt_ref); 130e1b3157fSTom Tucker struct module *owner = xprt->xpt_class->xcl_owner; 131e3bfca01SPavel Emelyanov if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) 132e3bfca01SPavel Emelyanov svcauth_unix_info_release(xprt); 1334fb8518bSPavel Emelyanov put_net(xprt->xpt_net); 13499de8ea9SJ. Bruce Fields /* See comment on corresponding get in xs_setup_bc_tcp(): */ 13599de8ea9SJ. Bruce Fields if (xprt->xpt_bc_xprt) 13699de8ea9SJ. Bruce Fields xprt_put(xprt->xpt_bc_xprt); 137e1b3157fSTom Tucker xprt->xpt_ops->xpo_free(xprt); 138e1b3157fSTom Tucker module_put(owner); 139e1b3157fSTom Tucker } 140e1b3157fSTom Tucker 141e1b3157fSTom Tucker void svc_xprt_put(struct svc_xprt *xprt) 142e1b3157fSTom Tucker { 143e1b3157fSTom Tucker kref_put(&xprt->xpt_ref, svc_xprt_free); 144e1b3157fSTom Tucker } 145e1b3157fSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_put); 146e1b3157fSTom Tucker 1471d8206b9STom Tucker /* 1481d8206b9STom Tucker * Called by transport drivers to initialize the transport independent 1491d8206b9STom Tucker * portion of the transport instance. 1501d8206b9STom Tucker */ 151bd4620ddSStanislav Kinsbursky void svc_xprt_init(struct net *net, struct svc_xprt_class *xcl, 152bd4620ddSStanislav Kinsbursky struct svc_xprt *xprt, struct svc_serv *serv) 1531d8206b9STom Tucker { 1541d8206b9STom Tucker memset(xprt, 0, sizeof(*xprt)); 1551d8206b9STom Tucker xprt->xpt_class = xcl; 1561d8206b9STom Tucker xprt->xpt_ops = xcl->xcl_ops; 157e1b3157fSTom Tucker kref_init(&xprt->xpt_ref); 158bb5cf160STom Tucker xprt->xpt_server = serv; 1597a182083STom Tucker INIT_LIST_HEAD(&xprt->xpt_list); 1607a182083STom Tucker INIT_LIST_HEAD(&xprt->xpt_ready); 1618c7b0172STom Tucker INIT_LIST_HEAD(&xprt->xpt_deferred); 162edc7a894SJ. Bruce Fields INIT_LIST_HEAD(&xprt->xpt_users); 163a50fea26STom Tucker mutex_init(&xprt->xpt_mutex); 164def13d74STom Tucker spin_lock_init(&xprt->xpt_lock); 1654e5caaa5STom Tucker set_bit(XPT_BUSY, &xprt->xpt_flags); 1664cfc7e60SRahul Iyer rpc_init_wait_queue(&xprt->xpt_bc_pending, "xpt_bc_pending"); 167bd4620ddSStanislav Kinsbursky xprt->xpt_net = get_net(net); 1681d8206b9STom Tucker } 1691d8206b9STom Tucker EXPORT_SYMBOL_GPL(svc_xprt_init); 170b700cbb1STom Tucker 1715dd248f6SChuck Lever static struct svc_xprt *__svc_xpo_create(struct svc_xprt_class *xcl, 1725dd248f6SChuck Lever struct svc_serv *serv, 17362832c03SPavel Emelyanov struct net *net, 1749652ada3SChuck Lever const int family, 1759652ada3SChuck Lever const unsigned short port, 1769652ada3SChuck Lever int flags) 177b700cbb1STom Tucker { 178b700cbb1STom Tucker struct sockaddr_in sin = { 179b700cbb1STom Tucker .sin_family = AF_INET, 180e6f1cebfSAl Viro .sin_addr.s_addr = htonl(INADDR_ANY), 181b700cbb1STom Tucker .sin_port = htons(port), 182b700cbb1STom Tucker }; 183dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 1845dd248f6SChuck Lever struct sockaddr_in6 sin6 = { 1855dd248f6SChuck Lever .sin6_family = AF_INET6, 1865dd248f6SChuck Lever .sin6_addr = IN6ADDR_ANY_INIT, 1875dd248f6SChuck Lever .sin6_port = htons(port), 1885dd248f6SChuck Lever }; 189dfd56b8bSEric Dumazet #endif 1905dd248f6SChuck Lever struct sockaddr *sap; 1915dd248f6SChuck Lever size_t len; 1925dd248f6SChuck Lever 1939652ada3SChuck Lever switch (family) { 1949652ada3SChuck Lever case PF_INET: 1955dd248f6SChuck Lever sap = (struct sockaddr *)&sin; 1965dd248f6SChuck Lever len = sizeof(sin); 1975dd248f6SChuck Lever break; 198dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 1999652ada3SChuck Lever case PF_INET6: 2005dd248f6SChuck Lever sap = (struct sockaddr *)&sin6; 2015dd248f6SChuck Lever len = sizeof(sin6); 2025dd248f6SChuck Lever break; 203dfd56b8bSEric Dumazet #endif 2045dd248f6SChuck Lever default: 2055dd248f6SChuck Lever return ERR_PTR(-EAFNOSUPPORT); 2065dd248f6SChuck Lever } 2075dd248f6SChuck Lever 20862832c03SPavel Emelyanov return xcl->xcl_ops->xpo_create(serv, net, sap, len, flags); 2095dd248f6SChuck Lever } 2105dd248f6SChuck Lever 2119652ada3SChuck Lever int svc_create_xprt(struct svc_serv *serv, const char *xprt_name, 212fc5d00b0SPavel Emelyanov struct net *net, const int family, 213fc5d00b0SPavel Emelyanov const unsigned short port, int flags) 2145dd248f6SChuck Lever { 2155dd248f6SChuck Lever struct svc_xprt_class *xcl; 2165dd248f6SChuck Lever 217b700cbb1STom Tucker dprintk("svc: creating transport %s[%d]\n", xprt_name, port); 218b700cbb1STom Tucker spin_lock(&svc_xprt_class_lock); 219b700cbb1STom Tucker list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) { 220b700cbb1STom Tucker struct svc_xprt *newxprt; 221ed2849d3SNeilBrown unsigned short newport; 2224e5caaa5STom Tucker 2234e5caaa5STom Tucker if (strcmp(xprt_name, xcl->xcl_name)) 2244e5caaa5STom Tucker continue; 2254e5caaa5STom Tucker 2264e5caaa5STom Tucker if (!try_module_get(xcl->xcl_owner)) 2274e5caaa5STom Tucker goto err; 2284e5caaa5STom Tucker 2294e5caaa5STom Tucker spin_unlock(&svc_xprt_class_lock); 23062832c03SPavel Emelyanov newxprt = __svc_xpo_create(xcl, serv, net, family, port, flags); 231b700cbb1STom Tucker if (IS_ERR(newxprt)) { 232b700cbb1STom Tucker module_put(xcl->xcl_owner); 2334e5caaa5STom Tucker return PTR_ERR(newxprt); 234b700cbb1STom Tucker } 2354e5caaa5STom Tucker 2364e5caaa5STom Tucker clear_bit(XPT_TEMP, &newxprt->xpt_flags); 2374e5caaa5STom Tucker spin_lock_bh(&serv->sv_lock); 2384e5caaa5STom Tucker list_add(&newxprt->xpt_list, &serv->sv_permsocks); 2394e5caaa5STom Tucker spin_unlock_bh(&serv->sv_lock); 240ed2849d3SNeilBrown newport = svc_xprt_local_port(newxprt); 2414e5caaa5STom Tucker clear_bit(XPT_BUSY, &newxprt->xpt_flags); 242ed2849d3SNeilBrown return newport; 243b700cbb1STom Tucker } 2444e5caaa5STom Tucker err: 245b700cbb1STom Tucker spin_unlock(&svc_xprt_class_lock); 246b700cbb1STom Tucker dprintk("svc: transport %s not found\n", xprt_name); 24768717908SChuck Lever 24868717908SChuck Lever /* This errno is exposed to user space. Provide a reasonable 24968717908SChuck Lever * perror msg for a bad transport. */ 25068717908SChuck Lever return -EPROTONOSUPPORT; 251b700cbb1STom Tucker } 252b700cbb1STom Tucker EXPORT_SYMBOL_GPL(svc_create_xprt); 2539dbc240fSTom Tucker 2549dbc240fSTom Tucker /* 2559dbc240fSTom Tucker * Copy the local and remote xprt addresses to the rqstp structure 2569dbc240fSTom Tucker */ 2579dbc240fSTom Tucker void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt) 2589dbc240fSTom Tucker { 2599dbc240fSTom Tucker memcpy(&rqstp->rq_addr, &xprt->xpt_remote, xprt->xpt_remotelen); 2609dbc240fSTom Tucker rqstp->rq_addrlen = xprt->xpt_remotelen; 2619dbc240fSTom Tucker 2629dbc240fSTom Tucker /* 2639dbc240fSTom Tucker * Destination address in request is needed for binding the 2649dbc240fSTom Tucker * source address in RPC replies/callbacks later. 2659dbc240fSTom Tucker */ 266849a1cf1SMi Jinlong memcpy(&rqstp->rq_daddr, &xprt->xpt_local, xprt->xpt_locallen); 267849a1cf1SMi Jinlong rqstp->rq_daddrlen = xprt->xpt_locallen; 2689dbc240fSTom Tucker } 2699dbc240fSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs); 2709dbc240fSTom Tucker 2710f0257eaSTom Tucker /** 2720f0257eaSTom Tucker * svc_print_addr - Format rq_addr field for printing 2730f0257eaSTom Tucker * @rqstp: svc_rqst struct containing address to print 2740f0257eaSTom Tucker * @buf: target buffer for formatted address 2750f0257eaSTom Tucker * @len: length of target buffer 2760f0257eaSTom Tucker * 2770f0257eaSTom Tucker */ 2780f0257eaSTom Tucker char *svc_print_addr(struct svc_rqst *rqstp, char *buf, size_t len) 2790f0257eaSTom Tucker { 2800f0257eaSTom Tucker return __svc_print_addr(svc_addr(rqstp), buf, len); 2810f0257eaSTom Tucker } 2820f0257eaSTom Tucker EXPORT_SYMBOL_GPL(svc_print_addr); 2830f0257eaSTom Tucker 2840f0257eaSTom Tucker /* 2850f0257eaSTom Tucker * Queue up an idle server thread. Must have pool->sp_lock held. 2860f0257eaSTom Tucker * Note: this is really a stack rather than a queue, so that we only 2870f0257eaSTom Tucker * use as many different threads as we need, and the rest don't pollute 2880f0257eaSTom Tucker * the cache. 2890f0257eaSTom Tucker */ 2900f0257eaSTom Tucker static void svc_thread_enqueue(struct svc_pool *pool, struct svc_rqst *rqstp) 2910f0257eaSTom Tucker { 2920f0257eaSTom Tucker list_add(&rqstp->rq_list, &pool->sp_threads); 2930f0257eaSTom Tucker } 2940f0257eaSTom Tucker 2950f0257eaSTom Tucker /* 2960f0257eaSTom Tucker * Dequeue an nfsd thread. Must have pool->sp_lock held. 2970f0257eaSTom Tucker */ 2980f0257eaSTom Tucker static void svc_thread_dequeue(struct svc_pool *pool, struct svc_rqst *rqstp) 2990f0257eaSTom Tucker { 3000f0257eaSTom Tucker list_del(&rqstp->rq_list); 3010f0257eaSTom Tucker } 3020f0257eaSTom Tucker 3039c335c0bSJ. Bruce Fields static bool svc_xprt_has_something_to_do(struct svc_xprt *xprt) 3049c335c0bSJ. Bruce Fields { 3059c335c0bSJ. Bruce Fields if (xprt->xpt_flags & ((1<<XPT_CONN)|(1<<XPT_CLOSE))) 3069c335c0bSJ. Bruce Fields return true; 3079c335c0bSJ. Bruce Fields if (xprt->xpt_flags & ((1<<XPT_DATA)|(1<<XPT_DEFERRED))) 3089c335c0bSJ. Bruce Fields return xprt->xpt_ops->xpo_has_wspace(xprt); 3099c335c0bSJ. Bruce Fields return false; 3109c335c0bSJ. Bruce Fields } 3119c335c0bSJ. Bruce Fields 3120f0257eaSTom Tucker /* 3130f0257eaSTom Tucker * Queue up a transport with data pending. If there are idle nfsd 3140f0257eaSTom Tucker * processes, wake 'em up. 3150f0257eaSTom Tucker * 3160f0257eaSTom Tucker */ 3170f0257eaSTom Tucker void svc_xprt_enqueue(struct svc_xprt *xprt) 3180f0257eaSTom Tucker { 3190f0257eaSTom Tucker struct svc_serv *serv = xprt->xpt_server; 3200f0257eaSTom Tucker struct svc_pool *pool; 3210f0257eaSTom Tucker struct svc_rqst *rqstp; 3220f0257eaSTom Tucker int cpu; 3230f0257eaSTom Tucker 3249c335c0bSJ. Bruce Fields if (!svc_xprt_has_something_to_do(xprt)) 3250f0257eaSTom Tucker return; 3260f0257eaSTom Tucker 3270f0257eaSTom Tucker cpu = get_cpu(); 3280f0257eaSTom Tucker pool = svc_pool_for_cpu(xprt->xpt_server, cpu); 3290f0257eaSTom Tucker put_cpu(); 3300f0257eaSTom Tucker 3310f0257eaSTom Tucker spin_lock_bh(&pool->sp_lock); 3320f0257eaSTom Tucker 33378c210efSJ. Bruce Fields if (!list_empty(&pool->sp_threads) && 33478c210efSJ. Bruce Fields !list_empty(&pool->sp_sockets)) 33578c210efSJ. Bruce Fields printk(KERN_ERR 33678c210efSJ. Bruce Fields "svc_xprt_enqueue: " 33778c210efSJ. Bruce Fields "threads and transports both waiting??\n"); 33878c210efSJ. Bruce Fields 33903cf6c9fSGreg Banks pool->sp_stats.packets++; 34003cf6c9fSGreg Banks 3410f0257eaSTom Tucker /* Mark transport as busy. It will remain in this state until 3420f0257eaSTom Tucker * the provider calls svc_xprt_received. We update XPT_BUSY 3430f0257eaSTom Tucker * atomically because it also guards against trying to enqueue 3440f0257eaSTom Tucker * the transport twice. 3450f0257eaSTom Tucker */ 3460f0257eaSTom Tucker if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) { 3470f0257eaSTom Tucker /* Don't enqueue transport while already enqueued */ 3480f0257eaSTom Tucker dprintk("svc: transport %p busy, not enqueued\n", xprt); 3490f0257eaSTom Tucker goto out_unlock; 3500f0257eaSTom Tucker } 3510f0257eaSTom Tucker 35278c210efSJ. Bruce Fields if (!list_empty(&pool->sp_threads)) { 3530f0257eaSTom Tucker rqstp = list_entry(pool->sp_threads.next, 3540f0257eaSTom Tucker struct svc_rqst, 3550f0257eaSTom Tucker rq_list); 3560f0257eaSTom Tucker dprintk("svc: transport %p served by daemon %p\n", 3570f0257eaSTom Tucker xprt, rqstp); 3580f0257eaSTom Tucker svc_thread_dequeue(pool, rqstp); 3590f0257eaSTom Tucker if (rqstp->rq_xprt) 3600f0257eaSTom Tucker printk(KERN_ERR 3610f0257eaSTom Tucker "svc_xprt_enqueue: server %p, rq_xprt=%p!\n", 3620f0257eaSTom Tucker rqstp, rqstp->rq_xprt); 3630f0257eaSTom Tucker rqstp->rq_xprt = xprt; 3640f0257eaSTom Tucker svc_xprt_get(xprt); 3650f0257eaSTom Tucker rqstp->rq_reserved = serv->sv_max_mesg; 3660f0257eaSTom Tucker atomic_add(rqstp->rq_reserved, &xprt->xpt_reserved); 36703cf6c9fSGreg Banks pool->sp_stats.threads_woken++; 3680f0257eaSTom Tucker wake_up(&rqstp->rq_wait); 3690f0257eaSTom Tucker } else { 3700f0257eaSTom Tucker dprintk("svc: transport %p put into queue\n", xprt); 3710f0257eaSTom Tucker list_add_tail(&xprt->xpt_ready, &pool->sp_sockets); 37203cf6c9fSGreg Banks pool->sp_stats.sockets_queued++; 3730f0257eaSTom Tucker } 3740f0257eaSTom Tucker 3750f0257eaSTom Tucker out_unlock: 3760f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 3770f0257eaSTom Tucker } 3780f0257eaSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_enqueue); 3790f0257eaSTom Tucker 3800f0257eaSTom Tucker /* 3810f0257eaSTom Tucker * Dequeue the first transport. Must be called with the pool->sp_lock held. 3820f0257eaSTom Tucker */ 3830f0257eaSTom Tucker static struct svc_xprt *svc_xprt_dequeue(struct svc_pool *pool) 3840f0257eaSTom Tucker { 3850f0257eaSTom Tucker struct svc_xprt *xprt; 3860f0257eaSTom Tucker 3870f0257eaSTom Tucker if (list_empty(&pool->sp_sockets)) 3880f0257eaSTom Tucker return NULL; 3890f0257eaSTom Tucker 3900f0257eaSTom Tucker xprt = list_entry(pool->sp_sockets.next, 3910f0257eaSTom Tucker struct svc_xprt, xpt_ready); 3920f0257eaSTom Tucker list_del_init(&xprt->xpt_ready); 3930f0257eaSTom Tucker 3940f0257eaSTom Tucker dprintk("svc: transport %p dequeued, inuse=%d\n", 3950f0257eaSTom Tucker xprt, atomic_read(&xprt->xpt_ref.refcount)); 3960f0257eaSTom Tucker 3970f0257eaSTom Tucker return xprt; 3980f0257eaSTom Tucker } 3990f0257eaSTom Tucker 4000f0257eaSTom Tucker /* 4010f0257eaSTom Tucker * svc_xprt_received conditionally queues the transport for processing 4020f0257eaSTom Tucker * by another thread. The caller must hold the XPT_BUSY bit and must 4030f0257eaSTom Tucker * not thereafter touch transport data. 4040f0257eaSTom Tucker * 4050f0257eaSTom Tucker * Note: XPT_DATA only gets cleared when a read-attempt finds no (or 4060f0257eaSTom Tucker * insufficient) data. 4070f0257eaSTom Tucker */ 4080f0257eaSTom Tucker void svc_xprt_received(struct svc_xprt *xprt) 4090f0257eaSTom Tucker { 4100f0257eaSTom Tucker BUG_ON(!test_bit(XPT_BUSY, &xprt->xpt_flags)); 411ed2849d3SNeilBrown /* As soon as we clear busy, the xprt could be closed and 412ed2849d3SNeilBrown * 'put', so we need a reference to call svc_xprt_enqueue with: 413ed2849d3SNeilBrown */ 414ed2849d3SNeilBrown svc_xprt_get(xprt); 4150f0257eaSTom Tucker clear_bit(XPT_BUSY, &xprt->xpt_flags); 4160f0257eaSTom Tucker svc_xprt_enqueue(xprt); 417ed2849d3SNeilBrown svc_xprt_put(xprt); 4180f0257eaSTom Tucker } 4190f0257eaSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_received); 4200f0257eaSTom Tucker 4210f0257eaSTom Tucker /** 4220f0257eaSTom Tucker * svc_reserve - change the space reserved for the reply to a request. 4230f0257eaSTom Tucker * @rqstp: The request in question 4240f0257eaSTom Tucker * @space: new max space to reserve 4250f0257eaSTom Tucker * 4260f0257eaSTom Tucker * Each request reserves some space on the output queue of the transport 4270f0257eaSTom Tucker * to make sure the reply fits. This function reduces that reserved 4280f0257eaSTom Tucker * space to be the amount of space used already, plus @space. 4290f0257eaSTom Tucker * 4300f0257eaSTom Tucker */ 4310f0257eaSTom Tucker void svc_reserve(struct svc_rqst *rqstp, int space) 4320f0257eaSTom Tucker { 4330f0257eaSTom Tucker space += rqstp->rq_res.head[0].iov_len; 4340f0257eaSTom Tucker 4350f0257eaSTom Tucker if (space < rqstp->rq_reserved) { 4360f0257eaSTom Tucker struct svc_xprt *xprt = rqstp->rq_xprt; 4370f0257eaSTom Tucker atomic_sub((rqstp->rq_reserved - space), &xprt->xpt_reserved); 4380f0257eaSTom Tucker rqstp->rq_reserved = space; 4390f0257eaSTom Tucker 4400f0257eaSTom Tucker svc_xprt_enqueue(xprt); 4410f0257eaSTom Tucker } 4420f0257eaSTom Tucker } 44324c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_reserve); 4440f0257eaSTom Tucker 4450f0257eaSTom Tucker static void svc_xprt_release(struct svc_rqst *rqstp) 4460f0257eaSTom Tucker { 4470f0257eaSTom Tucker struct svc_xprt *xprt = rqstp->rq_xprt; 4480f0257eaSTom Tucker 4490f0257eaSTom Tucker rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); 4500f0257eaSTom Tucker 4512779e3aeSTom Tucker kfree(rqstp->rq_deferred); 4522779e3aeSTom Tucker rqstp->rq_deferred = NULL; 4532779e3aeSTom Tucker 4540f0257eaSTom Tucker svc_free_res_pages(rqstp); 4550f0257eaSTom Tucker rqstp->rq_res.page_len = 0; 4560f0257eaSTom Tucker rqstp->rq_res.page_base = 0; 4570f0257eaSTom Tucker 4580f0257eaSTom Tucker /* Reset response buffer and release 4590f0257eaSTom Tucker * the reservation. 4600f0257eaSTom Tucker * But first, check that enough space was reserved 4610f0257eaSTom Tucker * for the reply, otherwise we have a bug! 4620f0257eaSTom Tucker */ 4630f0257eaSTom Tucker if ((rqstp->rq_res.len) > rqstp->rq_reserved) 4640f0257eaSTom Tucker printk(KERN_ERR "RPC request reserved %d but used %d\n", 4650f0257eaSTom Tucker rqstp->rq_reserved, 4660f0257eaSTom Tucker rqstp->rq_res.len); 4670f0257eaSTom Tucker 4680f0257eaSTom Tucker rqstp->rq_res.head[0].iov_len = 0; 4690f0257eaSTom Tucker svc_reserve(rqstp, 0); 4700f0257eaSTom Tucker rqstp->rq_xprt = NULL; 4710f0257eaSTom Tucker 4720f0257eaSTom Tucker svc_xprt_put(xprt); 4730f0257eaSTom Tucker } 4740f0257eaSTom Tucker 4750f0257eaSTom Tucker /* 4760f0257eaSTom Tucker * External function to wake up a server waiting for data 4770f0257eaSTom Tucker * This really only makes sense for services like lockd 4780f0257eaSTom Tucker * which have exactly one thread anyway. 4790f0257eaSTom Tucker */ 4800f0257eaSTom Tucker void svc_wake_up(struct svc_serv *serv) 4810f0257eaSTom Tucker { 4820f0257eaSTom Tucker struct svc_rqst *rqstp; 4830f0257eaSTom Tucker unsigned int i; 4840f0257eaSTom Tucker struct svc_pool *pool; 4850f0257eaSTom Tucker 4860f0257eaSTom Tucker for (i = 0; i < serv->sv_nrpools; i++) { 4870f0257eaSTom Tucker pool = &serv->sv_pools[i]; 4880f0257eaSTom Tucker 4890f0257eaSTom Tucker spin_lock_bh(&pool->sp_lock); 4900f0257eaSTom Tucker if (!list_empty(&pool->sp_threads)) { 4910f0257eaSTom Tucker rqstp = list_entry(pool->sp_threads.next, 4920f0257eaSTom Tucker struct svc_rqst, 4930f0257eaSTom Tucker rq_list); 4940f0257eaSTom Tucker dprintk("svc: daemon %p woken up.\n", rqstp); 4950f0257eaSTom Tucker /* 4960f0257eaSTom Tucker svc_thread_dequeue(pool, rqstp); 4970f0257eaSTom Tucker rqstp->rq_xprt = NULL; 4980f0257eaSTom Tucker */ 4990f0257eaSTom Tucker wake_up(&rqstp->rq_wait); 5000f0257eaSTom Tucker } 5010f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 5020f0257eaSTom Tucker } 5030f0257eaSTom Tucker } 50424c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_wake_up); 5050f0257eaSTom Tucker 5060f0257eaSTom Tucker int svc_port_is_privileged(struct sockaddr *sin) 5070f0257eaSTom Tucker { 5080f0257eaSTom Tucker switch (sin->sa_family) { 5090f0257eaSTom Tucker case AF_INET: 5100f0257eaSTom Tucker return ntohs(((struct sockaddr_in *)sin)->sin_port) 5110f0257eaSTom Tucker < PROT_SOCK; 5120f0257eaSTom Tucker case AF_INET6: 5130f0257eaSTom Tucker return ntohs(((struct sockaddr_in6 *)sin)->sin6_port) 5140f0257eaSTom Tucker < PROT_SOCK; 5150f0257eaSTom Tucker default: 5160f0257eaSTom Tucker return 0; 5170f0257eaSTom Tucker } 5180f0257eaSTom Tucker } 5190f0257eaSTom Tucker 5200f0257eaSTom Tucker /* 521c9233eb7SJeff Layton * Make sure that we don't have too many active connections. If we have, 522c9233eb7SJeff Layton * something must be dropped. It's not clear what will happen if we allow 523c9233eb7SJeff Layton * "too many" connections, but when dealing with network-facing software, 524c9233eb7SJeff Layton * we have to code defensively. Here we do that by imposing hard limits. 5250f0257eaSTom Tucker * 5260f0257eaSTom Tucker * There's no point in trying to do random drop here for DoS 5270f0257eaSTom Tucker * prevention. The NFS clients does 1 reconnect in 15 seconds. An 5280f0257eaSTom Tucker * attacker can easily beat that. 5290f0257eaSTom Tucker * 5300f0257eaSTom Tucker * The only somewhat efficient mechanism would be if drop old 5310f0257eaSTom Tucker * connections from the same IP first. But right now we don't even 5320f0257eaSTom Tucker * record the client IP in svc_sock. 533c9233eb7SJeff Layton * 534c9233eb7SJeff Layton * single-threaded services that expect a lot of clients will probably 535c9233eb7SJeff Layton * need to set sv_maxconn to override the default value which is based 536c9233eb7SJeff Layton * on the number of threads 5370f0257eaSTom Tucker */ 5380f0257eaSTom Tucker static void svc_check_conn_limits(struct svc_serv *serv) 5390f0257eaSTom Tucker { 540c9233eb7SJeff Layton unsigned int limit = serv->sv_maxconn ? serv->sv_maxconn : 541c9233eb7SJeff Layton (serv->sv_nrthreads+3) * 20; 542c9233eb7SJeff Layton 543c9233eb7SJeff Layton if (serv->sv_tmpcnt > limit) { 5440f0257eaSTom Tucker struct svc_xprt *xprt = NULL; 5450f0257eaSTom Tucker spin_lock_bh(&serv->sv_lock); 5460f0257eaSTom Tucker if (!list_empty(&serv->sv_tempsocks)) { 5470f0257eaSTom Tucker if (net_ratelimit()) { 5480f0257eaSTom Tucker /* Try to help the admin */ 5490f0257eaSTom Tucker printk(KERN_NOTICE "%s: too many open " 550c9233eb7SJeff Layton "connections, consider increasing %s\n", 551c9233eb7SJeff Layton serv->sv_name, serv->sv_maxconn ? 552c9233eb7SJeff Layton "the max number of connections." : 553c9233eb7SJeff Layton "the number of threads."); 5540f0257eaSTom Tucker } 5550f0257eaSTom Tucker /* 5560f0257eaSTom Tucker * Always select the oldest connection. It's not fair, 5570f0257eaSTom Tucker * but so is life 5580f0257eaSTom Tucker */ 5590f0257eaSTom Tucker xprt = list_entry(serv->sv_tempsocks.prev, 5600f0257eaSTom Tucker struct svc_xprt, 5610f0257eaSTom Tucker xpt_list); 5620f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 5630f0257eaSTom Tucker svc_xprt_get(xprt); 5640f0257eaSTom Tucker } 5650f0257eaSTom Tucker spin_unlock_bh(&serv->sv_lock); 5660f0257eaSTom Tucker 5670f0257eaSTom Tucker if (xprt) { 5680f0257eaSTom Tucker svc_xprt_enqueue(xprt); 5690f0257eaSTom Tucker svc_xprt_put(xprt); 5700f0257eaSTom Tucker } 5710f0257eaSTom Tucker } 5720f0257eaSTom Tucker } 5730f0257eaSTom Tucker 5740f0257eaSTom Tucker /* 5750f0257eaSTom Tucker * Receive the next request on any transport. This code is carefully 5760f0257eaSTom Tucker * organised not to touch any cachelines in the shared svc_serv 5770f0257eaSTom Tucker * structure, only cachelines in the local svc_pool. 5780f0257eaSTom Tucker */ 5790f0257eaSTom Tucker int svc_recv(struct svc_rqst *rqstp, long timeout) 5800f0257eaSTom Tucker { 5810f0257eaSTom Tucker struct svc_xprt *xprt = NULL; 5820f0257eaSTom Tucker struct svc_serv *serv = rqstp->rq_server; 5830f0257eaSTom Tucker struct svc_pool *pool = rqstp->rq_pool; 5840f0257eaSTom Tucker int len, i; 5850f0257eaSTom Tucker int pages; 5860f0257eaSTom Tucker struct xdr_buf *arg; 5870f0257eaSTom Tucker DECLARE_WAITQUEUE(wait, current); 58803cf6c9fSGreg Banks long time_left; 5890f0257eaSTom Tucker 5900f0257eaSTom Tucker dprintk("svc: server %p waiting for data (to = %ld)\n", 5910f0257eaSTom Tucker rqstp, timeout); 5920f0257eaSTom Tucker 5930f0257eaSTom Tucker if (rqstp->rq_xprt) 5940f0257eaSTom Tucker printk(KERN_ERR 5950f0257eaSTom Tucker "svc_recv: service %p, transport not NULL!\n", 5960f0257eaSTom Tucker rqstp); 5970f0257eaSTom Tucker if (waitqueue_active(&rqstp->rq_wait)) 5980f0257eaSTom Tucker printk(KERN_ERR 5990f0257eaSTom Tucker "svc_recv: service %p, wait queue active!\n", 6000f0257eaSTom Tucker rqstp); 6010f0257eaSTom Tucker 6020f0257eaSTom Tucker /* now allocate needed pages. If we get a failure, sleep briefly */ 6030f0257eaSTom Tucker pages = (serv->sv_max_mesg + PAGE_SIZE) / PAGE_SIZE; 6040f0257eaSTom Tucker for (i = 0; i < pages ; i++) 6050f0257eaSTom Tucker while (rqstp->rq_pages[i] == NULL) { 6060f0257eaSTom Tucker struct page *p = alloc_page(GFP_KERNEL); 6070f0257eaSTom Tucker if (!p) { 6087b54fe61SJeff Layton set_current_state(TASK_INTERRUPTIBLE); 6097b54fe61SJeff Layton if (signalled() || kthread_should_stop()) { 6107b54fe61SJeff Layton set_current_state(TASK_RUNNING); 6117086721fSJeff Layton return -EINTR; 6127b54fe61SJeff Layton } 6137b54fe61SJeff Layton schedule_timeout(msecs_to_jiffies(500)); 6140f0257eaSTom Tucker } 6150f0257eaSTom Tucker rqstp->rq_pages[i] = p; 6160f0257eaSTom Tucker } 6170f0257eaSTom Tucker rqstp->rq_pages[i++] = NULL; /* this might be seen in nfs_read_actor */ 6180f0257eaSTom Tucker BUG_ON(pages >= RPCSVC_MAXPAGES); 6190f0257eaSTom Tucker 6200f0257eaSTom Tucker /* Make arg->head point to first page and arg->pages point to rest */ 6210f0257eaSTom Tucker arg = &rqstp->rq_arg; 6220f0257eaSTom Tucker arg->head[0].iov_base = page_address(rqstp->rq_pages[0]); 6230f0257eaSTom Tucker arg->head[0].iov_len = PAGE_SIZE; 6240f0257eaSTom Tucker arg->pages = rqstp->rq_pages + 1; 6250f0257eaSTom Tucker arg->page_base = 0; 6260f0257eaSTom Tucker /* save at least one page for response */ 6270f0257eaSTom Tucker arg->page_len = (pages-2)*PAGE_SIZE; 6280f0257eaSTom Tucker arg->len = (pages-1)*PAGE_SIZE; 6290f0257eaSTom Tucker arg->tail[0].iov_len = 0; 6300f0257eaSTom Tucker 6310f0257eaSTom Tucker try_to_freeze(); 6320f0257eaSTom Tucker cond_resched(); 6337086721fSJeff Layton if (signalled() || kthread_should_stop()) 6340f0257eaSTom Tucker return -EINTR; 6350f0257eaSTom Tucker 636f16b6e8dSNeilBrown /* Normally we will wait up to 5 seconds for any required 637f16b6e8dSNeilBrown * cache information to be provided. 638f16b6e8dSNeilBrown */ 639f16b6e8dSNeilBrown rqstp->rq_chandle.thread_wait = 5*HZ; 640f16b6e8dSNeilBrown 6410f0257eaSTom Tucker spin_lock_bh(&pool->sp_lock); 6420f0257eaSTom Tucker xprt = svc_xprt_dequeue(pool); 6430f0257eaSTom Tucker if (xprt) { 6440f0257eaSTom Tucker rqstp->rq_xprt = xprt; 6450f0257eaSTom Tucker svc_xprt_get(xprt); 6460f0257eaSTom Tucker rqstp->rq_reserved = serv->sv_max_mesg; 6470f0257eaSTom Tucker atomic_add(rqstp->rq_reserved, &xprt->xpt_reserved); 648f16b6e8dSNeilBrown 649f16b6e8dSNeilBrown /* As there is a shortage of threads and this request 6506610f720SJ. Bruce Fields * had to be queued, don't allow the thread to wait so 651f16b6e8dSNeilBrown * long for cache updates. 652f16b6e8dSNeilBrown */ 653f16b6e8dSNeilBrown rqstp->rq_chandle.thread_wait = 1*HZ; 6540f0257eaSTom Tucker } else { 6550f0257eaSTom Tucker /* No data pending. Go to sleep */ 6560f0257eaSTom Tucker svc_thread_enqueue(pool, rqstp); 6570f0257eaSTom Tucker 6580f0257eaSTom Tucker /* 6590f0257eaSTom Tucker * We have to be able to interrupt this wait 6600f0257eaSTom Tucker * to bring down the daemons ... 6610f0257eaSTom Tucker */ 6620f0257eaSTom Tucker set_current_state(TASK_INTERRUPTIBLE); 6637086721fSJeff Layton 6647086721fSJeff Layton /* 6657086721fSJeff Layton * checking kthread_should_stop() here allows us to avoid 6667086721fSJeff Layton * locking and signalling when stopping kthreads that call 6677086721fSJeff Layton * svc_recv. If the thread has already been woken up, then 6687086721fSJeff Layton * we can exit here without sleeping. If not, then it 6697086721fSJeff Layton * it'll be woken up quickly during the schedule_timeout 6707086721fSJeff Layton */ 6717086721fSJeff Layton if (kthread_should_stop()) { 6727086721fSJeff Layton set_current_state(TASK_RUNNING); 6737086721fSJeff Layton spin_unlock_bh(&pool->sp_lock); 6747086721fSJeff Layton return -EINTR; 6757086721fSJeff Layton } 6767086721fSJeff Layton 6770f0257eaSTom Tucker add_wait_queue(&rqstp->rq_wait, &wait); 6780f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 6790f0257eaSTom Tucker 68003cf6c9fSGreg Banks time_left = schedule_timeout(timeout); 6810f0257eaSTom Tucker 6820f0257eaSTom Tucker try_to_freeze(); 6830f0257eaSTom Tucker 6840f0257eaSTom Tucker spin_lock_bh(&pool->sp_lock); 6850f0257eaSTom Tucker remove_wait_queue(&rqstp->rq_wait, &wait); 68603cf6c9fSGreg Banks if (!time_left) 68703cf6c9fSGreg Banks pool->sp_stats.threads_timedout++; 6880f0257eaSTom Tucker 6890f0257eaSTom Tucker xprt = rqstp->rq_xprt; 6900f0257eaSTom Tucker if (!xprt) { 6910f0257eaSTom Tucker svc_thread_dequeue(pool, rqstp); 6920f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 6930f0257eaSTom Tucker dprintk("svc: server %p, no data yet\n", rqstp); 6947086721fSJeff Layton if (signalled() || kthread_should_stop()) 6957086721fSJeff Layton return -EINTR; 6967086721fSJeff Layton else 6977086721fSJeff Layton return -EAGAIN; 6980f0257eaSTom Tucker } 6990f0257eaSTom Tucker } 7000f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 7010f0257eaSTom Tucker 7020f0257eaSTom Tucker len = 0; 7031b644b6eSJ. Bruce Fields if (test_bit(XPT_CLOSE, &xprt->xpt_flags)) { 7041b644b6eSJ. Bruce Fields dprintk("svc_recv: found XPT_CLOSE\n"); 7051b644b6eSJ. Bruce Fields svc_delete_xprt(xprt); 706ca7896cdSJ. Bruce Fields /* Leave XPT_BUSY set on the dead xprt: */ 707ca7896cdSJ. Bruce Fields goto out; 708ca7896cdSJ. Bruce Fields } 709ca7896cdSJ. Bruce Fields if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) { 7100f0257eaSTom Tucker struct svc_xprt *newxpt; 7110f0257eaSTom Tucker newxpt = xprt->xpt_ops->xpo_accept(xprt); 7120f0257eaSTom Tucker if (newxpt) { 7130f0257eaSTom Tucker /* 7140f0257eaSTom Tucker * We know this module_get will succeed because the 7150f0257eaSTom Tucker * listener holds a reference too 7160f0257eaSTom Tucker */ 7170f0257eaSTom Tucker __module_get(newxpt->xpt_class->xcl_owner); 7180f0257eaSTom Tucker svc_check_conn_limits(xprt->xpt_server); 7190f0257eaSTom Tucker spin_lock_bh(&serv->sv_lock); 7200f0257eaSTom Tucker set_bit(XPT_TEMP, &newxpt->xpt_flags); 7210f0257eaSTom Tucker list_add(&newxpt->xpt_list, &serv->sv_tempsocks); 7220f0257eaSTom Tucker serv->sv_tmpcnt++; 7230f0257eaSTom Tucker if (serv->sv_temptimer.function == NULL) { 7240f0257eaSTom Tucker /* setup timer to age temp transports */ 7250f0257eaSTom Tucker setup_timer(&serv->sv_temptimer, 7260f0257eaSTom Tucker svc_age_temp_xprts, 7270f0257eaSTom Tucker (unsigned long)serv); 7280f0257eaSTom Tucker mod_timer(&serv->sv_temptimer, 7290f0257eaSTom Tucker jiffies + svc_conn_age_period * HZ); 7300f0257eaSTom Tucker } 7310f0257eaSTom Tucker spin_unlock_bh(&serv->sv_lock); 7320f0257eaSTom Tucker svc_xprt_received(newxpt); 7330f0257eaSTom Tucker } 7349c335c0bSJ. Bruce Fields } else if (xprt->xpt_ops->xpo_has_wspace(xprt)) { 7350f0257eaSTom Tucker dprintk("svc: server %p, pool %u, transport %p, inuse=%d\n", 7360f0257eaSTom Tucker rqstp, pool->sp_id, xprt, 7370f0257eaSTom Tucker atomic_read(&xprt->xpt_ref.refcount)); 7380f0257eaSTom Tucker rqstp->rq_deferred = svc_deferred_dequeue(xprt); 739ca7896cdSJ. Bruce Fields if (rqstp->rq_deferred) 7400f0257eaSTom Tucker len = svc_deferred_recv(rqstp); 741ca7896cdSJ. Bruce Fields else 7420f0257eaSTom Tucker len = xprt->xpt_ops->xpo_recvfrom(rqstp); 7430f0257eaSTom Tucker dprintk("svc: got len=%d\n", len); 7440f0257eaSTom Tucker } 745ca7896cdSJ. Bruce Fields svc_xprt_received(xprt); 7460f0257eaSTom Tucker 7470f0257eaSTom Tucker /* No data, incomplete (TCP) read, or accept() */ 748ca7896cdSJ. Bruce Fields if (len == 0 || len == -EAGAIN) 749ca7896cdSJ. Bruce Fields goto out; 750ca7896cdSJ. Bruce Fields 7510f0257eaSTom Tucker clear_bit(XPT_OLD, &xprt->xpt_flags); 7520f0257eaSTom Tucker 7530f0257eaSTom Tucker rqstp->rq_secure = svc_port_is_privileged(svc_addr(rqstp)); 7540f0257eaSTom Tucker rqstp->rq_chandle.defer = svc_defer; 7550f0257eaSTom Tucker 7560f0257eaSTom Tucker if (serv->sv_stats) 7570f0257eaSTom Tucker serv->sv_stats->netcnt++; 7580f0257eaSTom Tucker return len; 759ca7896cdSJ. Bruce Fields out: 760ca7896cdSJ. Bruce Fields rqstp->rq_res.len = 0; 761ca7896cdSJ. Bruce Fields svc_xprt_release(rqstp); 762ca7896cdSJ. Bruce Fields return -EAGAIN; 7630f0257eaSTom Tucker } 76424c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_recv); 7650f0257eaSTom Tucker 7660f0257eaSTom Tucker /* 7670f0257eaSTom Tucker * Drop request 7680f0257eaSTom Tucker */ 7690f0257eaSTom Tucker void svc_drop(struct svc_rqst *rqstp) 7700f0257eaSTom Tucker { 7710f0257eaSTom Tucker dprintk("svc: xprt %p dropped request\n", rqstp->rq_xprt); 7720f0257eaSTom Tucker svc_xprt_release(rqstp); 7730f0257eaSTom Tucker } 77424c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_drop); 7750f0257eaSTom Tucker 7760f0257eaSTom Tucker /* 7770f0257eaSTom Tucker * Return reply to client. 7780f0257eaSTom Tucker */ 7790f0257eaSTom Tucker int svc_send(struct svc_rqst *rqstp) 7800f0257eaSTom Tucker { 7810f0257eaSTom Tucker struct svc_xprt *xprt; 7820f0257eaSTom Tucker int len; 7830f0257eaSTom Tucker struct xdr_buf *xb; 7840f0257eaSTom Tucker 7850f0257eaSTom Tucker xprt = rqstp->rq_xprt; 7860f0257eaSTom Tucker if (!xprt) 7870f0257eaSTom Tucker return -EFAULT; 7880f0257eaSTom Tucker 7890f0257eaSTom Tucker /* release the receive skb before sending the reply */ 7900f0257eaSTom Tucker rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); 7910f0257eaSTom Tucker 7920f0257eaSTom Tucker /* calculate over-all length */ 7930f0257eaSTom Tucker xb = &rqstp->rq_res; 7940f0257eaSTom Tucker xb->len = xb->head[0].iov_len + 7950f0257eaSTom Tucker xb->page_len + 7960f0257eaSTom Tucker xb->tail[0].iov_len; 7970f0257eaSTom Tucker 7980f0257eaSTom Tucker /* Grab mutex to serialize outgoing data. */ 7990f0257eaSTom Tucker mutex_lock(&xprt->xpt_mutex); 8000f0257eaSTom Tucker if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 8010f0257eaSTom Tucker len = -ENOTCONN; 8020f0257eaSTom Tucker else 8030f0257eaSTom Tucker len = xprt->xpt_ops->xpo_sendto(rqstp); 8040f0257eaSTom Tucker mutex_unlock(&xprt->xpt_mutex); 8054cfc7e60SRahul Iyer rpc_wake_up(&xprt->xpt_bc_pending); 8060f0257eaSTom Tucker svc_xprt_release(rqstp); 8070f0257eaSTom Tucker 8080f0257eaSTom Tucker if (len == -ECONNREFUSED || len == -ENOTCONN || len == -EAGAIN) 8090f0257eaSTom Tucker return 0; 8100f0257eaSTom Tucker return len; 8110f0257eaSTom Tucker } 8120f0257eaSTom Tucker 8130f0257eaSTom Tucker /* 8140f0257eaSTom Tucker * Timer function to close old temporary transports, using 8150f0257eaSTom Tucker * a mark-and-sweep algorithm. 8160f0257eaSTom Tucker */ 8170f0257eaSTom Tucker static void svc_age_temp_xprts(unsigned long closure) 8180f0257eaSTom Tucker { 8190f0257eaSTom Tucker struct svc_serv *serv = (struct svc_serv *)closure; 8200f0257eaSTom Tucker struct svc_xprt *xprt; 8210f0257eaSTom Tucker struct list_head *le, *next; 8220f0257eaSTom Tucker LIST_HEAD(to_be_aged); 8230f0257eaSTom Tucker 8240f0257eaSTom Tucker dprintk("svc_age_temp_xprts\n"); 8250f0257eaSTom Tucker 8260f0257eaSTom Tucker if (!spin_trylock_bh(&serv->sv_lock)) { 8270f0257eaSTom Tucker /* busy, try again 1 sec later */ 8280f0257eaSTom Tucker dprintk("svc_age_temp_xprts: busy\n"); 8290f0257eaSTom Tucker mod_timer(&serv->sv_temptimer, jiffies + HZ); 8300f0257eaSTom Tucker return; 8310f0257eaSTom Tucker } 8320f0257eaSTom Tucker 8330f0257eaSTom Tucker list_for_each_safe(le, next, &serv->sv_tempsocks) { 8340f0257eaSTom Tucker xprt = list_entry(le, struct svc_xprt, xpt_list); 8350f0257eaSTom Tucker 8360f0257eaSTom Tucker /* First time through, just mark it OLD. Second time 8370f0257eaSTom Tucker * through, close it. */ 8380f0257eaSTom Tucker if (!test_and_set_bit(XPT_OLD, &xprt->xpt_flags)) 8390f0257eaSTom Tucker continue; 840f64f9e71SJoe Perches if (atomic_read(&xprt->xpt_ref.refcount) > 1 || 841f64f9e71SJoe Perches test_bit(XPT_BUSY, &xprt->xpt_flags)) 8420f0257eaSTom Tucker continue; 8430f0257eaSTom Tucker svc_xprt_get(xprt); 8440f0257eaSTom Tucker list_move(le, &to_be_aged); 8450f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 8460f0257eaSTom Tucker set_bit(XPT_DETACHED, &xprt->xpt_flags); 8470f0257eaSTom Tucker } 8480f0257eaSTom Tucker spin_unlock_bh(&serv->sv_lock); 8490f0257eaSTom Tucker 8500f0257eaSTom Tucker while (!list_empty(&to_be_aged)) { 8510f0257eaSTom Tucker le = to_be_aged.next; 8520f0257eaSTom Tucker /* fiddling the xpt_list node is safe 'cos we're XPT_DETACHED */ 8530f0257eaSTom Tucker list_del_init(le); 8540f0257eaSTom Tucker xprt = list_entry(le, struct svc_xprt, xpt_list); 8550f0257eaSTom Tucker 8560f0257eaSTom Tucker dprintk("queuing xprt %p for closing\n", xprt); 8570f0257eaSTom Tucker 8580f0257eaSTom Tucker /* a thread will dequeue and close it soon */ 8590f0257eaSTom Tucker svc_xprt_enqueue(xprt); 8600f0257eaSTom Tucker svc_xprt_put(xprt); 8610f0257eaSTom Tucker } 8620f0257eaSTom Tucker 8630f0257eaSTom Tucker mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ); 8640f0257eaSTom Tucker } 8650f0257eaSTom Tucker 866edc7a894SJ. Bruce Fields static void call_xpt_users(struct svc_xprt *xprt) 867edc7a894SJ. Bruce Fields { 868edc7a894SJ. Bruce Fields struct svc_xpt_user *u; 869edc7a894SJ. Bruce Fields 870edc7a894SJ. Bruce Fields spin_lock(&xprt->xpt_lock); 871edc7a894SJ. Bruce Fields while (!list_empty(&xprt->xpt_users)) { 872edc7a894SJ. Bruce Fields u = list_first_entry(&xprt->xpt_users, struct svc_xpt_user, list); 873edc7a894SJ. Bruce Fields list_del(&u->list); 874edc7a894SJ. Bruce Fields u->callback(u); 875edc7a894SJ. Bruce Fields } 876edc7a894SJ. Bruce Fields spin_unlock(&xprt->xpt_lock); 877edc7a894SJ. Bruce Fields } 878edc7a894SJ. Bruce Fields 8790f0257eaSTom Tucker /* 8800f0257eaSTom Tucker * Remove a dead transport 8810f0257eaSTom Tucker */ 8827710ec36SJ. Bruce Fields static void svc_delete_xprt(struct svc_xprt *xprt) 8830f0257eaSTom Tucker { 8840f0257eaSTom Tucker struct svc_serv *serv = xprt->xpt_server; 88522945e4aSTom Tucker struct svc_deferred_req *dr; 88622945e4aSTom Tucker 88722945e4aSTom Tucker /* Only do this once */ 88822945e4aSTom Tucker if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags)) 889ac9303ebSJ. Bruce Fields BUG(); 8900f0257eaSTom Tucker 8910f0257eaSTom Tucker dprintk("svc: svc_delete_xprt(%p)\n", xprt); 8920f0257eaSTom Tucker xprt->xpt_ops->xpo_detach(xprt); 8930f0257eaSTom Tucker 8940f0257eaSTom Tucker spin_lock_bh(&serv->sv_lock); 8950f0257eaSTom Tucker if (!test_and_set_bit(XPT_DETACHED, &xprt->xpt_flags)) 8960f0257eaSTom Tucker list_del_init(&xprt->xpt_list); 897b4f36f88SJ. Bruce Fields BUG_ON(!list_empty(&xprt->xpt_ready)); 8980f0257eaSTom Tucker if (test_bit(XPT_TEMP, &xprt->xpt_flags)) 8990f0257eaSTom Tucker serv->sv_tmpcnt--; 900788e69e5SJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 90122945e4aSTom Tucker 902ab1b18f7SNeil Brown while ((dr = svc_deferred_dequeue(xprt)) != NULL) 90322945e4aSTom Tucker kfree(dr); 90422945e4aSTom Tucker 905edc7a894SJ. Bruce Fields call_xpt_users(xprt); 90622945e4aSTom Tucker svc_xprt_put(xprt); 9070f0257eaSTom Tucker } 9080f0257eaSTom Tucker 9090f0257eaSTom Tucker void svc_close_xprt(struct svc_xprt *xprt) 9100f0257eaSTom Tucker { 9110f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 9120f0257eaSTom Tucker if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) 9130f0257eaSTom Tucker /* someone else will have to effect the close */ 9140f0257eaSTom Tucker return; 915b1763316SJ. Bruce Fields /* 916b1763316SJ. Bruce Fields * We expect svc_close_xprt() to work even when no threads are 917b1763316SJ. Bruce Fields * running (e.g., while configuring the server before starting 918b1763316SJ. Bruce Fields * any threads), so if the transport isn't busy, we delete 919b1763316SJ. Bruce Fields * it ourself: 920b1763316SJ. Bruce Fields */ 9210f0257eaSTom Tucker svc_delete_xprt(xprt); 9220f0257eaSTom Tucker } 923a217813fSTom Tucker EXPORT_SYMBOL_GPL(svc_close_xprt); 9240f0257eaSTom Tucker 9257b147f1fSStanislav Kinsbursky static void svc_close_list(struct list_head *xprt_list, struct net *net) 9260f0257eaSTom Tucker { 9270f0257eaSTom Tucker struct svc_xprt *xprt; 9280f0257eaSTom Tucker 929b4f36f88SJ. Bruce Fields list_for_each_entry(xprt, xprt_list, xpt_list) { 9307b147f1fSStanislav Kinsbursky if (xprt->xpt_net != net) 9317b147f1fSStanislav Kinsbursky continue; 9320f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 933b4f36f88SJ. Bruce Fields set_bit(XPT_BUSY, &xprt->xpt_flags); 9340f0257eaSTom Tucker } 9350f0257eaSTom Tucker } 9360f0257eaSTom Tucker 9377b147f1fSStanislav Kinsbursky static void svc_clear_pools(struct svc_serv *serv, struct net *net) 9382fefb8a0SJ. Bruce Fields { 939b4f36f88SJ. Bruce Fields struct svc_pool *pool; 940b4f36f88SJ. Bruce Fields struct svc_xprt *xprt; 941b4f36f88SJ. Bruce Fields struct svc_xprt *tmp; 942b4f36f88SJ. Bruce Fields int i; 943b4f36f88SJ. Bruce Fields 944b4f36f88SJ. Bruce Fields for (i = 0; i < serv->sv_nrpools; i++) { 945b4f36f88SJ. Bruce Fields pool = &serv->sv_pools[i]; 946b4f36f88SJ. Bruce Fields 947b4f36f88SJ. Bruce Fields spin_lock_bh(&pool->sp_lock); 9486f513365SStanislav Kinsbursky list_for_each_entry_safe(xprt, tmp, &pool->sp_sockets, xpt_ready) { 9497b147f1fSStanislav Kinsbursky if (xprt->xpt_net != net) 9507b147f1fSStanislav Kinsbursky continue; 951b4f36f88SJ. Bruce Fields list_del_init(&xprt->xpt_ready); 952b4f36f88SJ. Bruce Fields } 953b4f36f88SJ. Bruce Fields spin_unlock_bh(&pool->sp_lock); 954b4f36f88SJ. Bruce Fields } 9556f513365SStanislav Kinsbursky } 9566f513365SStanislav Kinsbursky 9577b147f1fSStanislav Kinsbursky static void svc_clear_list(struct list_head *xprt_list, struct net *net) 9586f513365SStanislav Kinsbursky { 9596f513365SStanislav Kinsbursky struct svc_xprt *xprt; 9606f513365SStanislav Kinsbursky struct svc_xprt *tmp; 9616f513365SStanislav Kinsbursky 9623a22bf50SStanislav Kinsbursky list_for_each_entry_safe(xprt, tmp, xprt_list, xpt_list) { 9637b147f1fSStanislav Kinsbursky if (xprt->xpt_net != net) 9647b147f1fSStanislav Kinsbursky continue; 9653a22bf50SStanislav Kinsbursky svc_delete_xprt(xprt); 9663a22bf50SStanislav Kinsbursky } 9677b147f1fSStanislav Kinsbursky list_for_each_entry(xprt, xprt_list, xpt_list) 9687b147f1fSStanislav Kinsbursky BUG_ON(xprt->xpt_net == net); 9693a22bf50SStanislav Kinsbursky } 9703a22bf50SStanislav Kinsbursky 9717b147f1fSStanislav Kinsbursky void svc_close_net(struct svc_serv *serv, struct net *net) 9723a22bf50SStanislav Kinsbursky { 9737b147f1fSStanislav Kinsbursky svc_close_list(&serv->sv_tempsocks, net); 9747b147f1fSStanislav Kinsbursky svc_close_list(&serv->sv_permsocks, net); 9756f513365SStanislav Kinsbursky 9767b147f1fSStanislav Kinsbursky svc_clear_pools(serv, net); 977b4f36f88SJ. Bruce Fields /* 978b4f36f88SJ. Bruce Fields * At this point the sp_sockets lists will stay empty, since 979b4f36f88SJ. Bruce Fields * svc_enqueue will not add new entries without taking the 980b4f36f88SJ. Bruce Fields * sp_lock and checking XPT_BUSY. 981b4f36f88SJ. Bruce Fields */ 9827b147f1fSStanislav Kinsbursky svc_clear_list(&serv->sv_tempsocks, net); 9837b147f1fSStanislav Kinsbursky svc_clear_list(&serv->sv_permsocks, net); 9842fefb8a0SJ. Bruce Fields } 9852fefb8a0SJ. Bruce Fields 9860f0257eaSTom Tucker /* 9870f0257eaSTom Tucker * Handle defer and revisit of requests 9880f0257eaSTom Tucker */ 9890f0257eaSTom Tucker 9900f0257eaSTom Tucker static void svc_revisit(struct cache_deferred_req *dreq, int too_many) 9910f0257eaSTom Tucker { 9920f0257eaSTom Tucker struct svc_deferred_req *dr = 9930f0257eaSTom Tucker container_of(dreq, struct svc_deferred_req, handle); 9940f0257eaSTom Tucker struct svc_xprt *xprt = dr->xprt; 9950f0257eaSTom Tucker 99622945e4aSTom Tucker spin_lock(&xprt->xpt_lock); 99722945e4aSTom Tucker set_bit(XPT_DEFERRED, &xprt->xpt_flags); 99822945e4aSTom Tucker if (too_many || test_bit(XPT_DEAD, &xprt->xpt_flags)) { 99922945e4aSTom Tucker spin_unlock(&xprt->xpt_lock); 100022945e4aSTom Tucker dprintk("revisit canceled\n"); 10010f0257eaSTom Tucker svc_xprt_put(xprt); 10020f0257eaSTom Tucker kfree(dr); 10030f0257eaSTom Tucker return; 10040f0257eaSTom Tucker } 10050f0257eaSTom Tucker dprintk("revisit queued\n"); 10060f0257eaSTom Tucker dr->xprt = NULL; 10070f0257eaSTom Tucker list_add(&dr->handle.recent, &xprt->xpt_deferred); 10080f0257eaSTom Tucker spin_unlock(&xprt->xpt_lock); 10090f0257eaSTom Tucker svc_xprt_enqueue(xprt); 10100f0257eaSTom Tucker svc_xprt_put(xprt); 10110f0257eaSTom Tucker } 10120f0257eaSTom Tucker 1013260c1d12STom Tucker /* 1014260c1d12STom Tucker * Save the request off for later processing. The request buffer looks 1015260c1d12STom Tucker * like this: 1016260c1d12STom Tucker * 1017260c1d12STom Tucker * <xprt-header><rpc-header><rpc-pagelist><rpc-tail> 1018260c1d12STom Tucker * 1019260c1d12STom Tucker * This code can only handle requests that consist of an xprt-header 1020260c1d12STom Tucker * and rpc-header. 1021260c1d12STom Tucker */ 10220f0257eaSTom Tucker static struct cache_deferred_req *svc_defer(struct cache_req *req) 10230f0257eaSTom Tucker { 10240f0257eaSTom Tucker struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle); 10250f0257eaSTom Tucker struct svc_deferred_req *dr; 10260f0257eaSTom Tucker 10272f425878SAndy Adamson if (rqstp->rq_arg.page_len || !rqstp->rq_usedeferral) 10280f0257eaSTom Tucker return NULL; /* if more than a page, give up FIXME */ 10290f0257eaSTom Tucker if (rqstp->rq_deferred) { 10300f0257eaSTom Tucker dr = rqstp->rq_deferred; 10310f0257eaSTom Tucker rqstp->rq_deferred = NULL; 10320f0257eaSTom Tucker } else { 1033260c1d12STom Tucker size_t skip; 1034260c1d12STom Tucker size_t size; 10350f0257eaSTom Tucker /* FIXME maybe discard if size too large */ 1036260c1d12STom Tucker size = sizeof(struct svc_deferred_req) + rqstp->rq_arg.len; 10370f0257eaSTom Tucker dr = kmalloc(size, GFP_KERNEL); 10380f0257eaSTom Tucker if (dr == NULL) 10390f0257eaSTom Tucker return NULL; 10400f0257eaSTom Tucker 10410f0257eaSTom Tucker dr->handle.owner = rqstp->rq_server; 10420f0257eaSTom Tucker dr->prot = rqstp->rq_prot; 10430f0257eaSTom Tucker memcpy(&dr->addr, &rqstp->rq_addr, rqstp->rq_addrlen); 10440f0257eaSTom Tucker dr->addrlen = rqstp->rq_addrlen; 10450f0257eaSTom Tucker dr->daddr = rqstp->rq_daddr; 10460f0257eaSTom Tucker dr->argslen = rqstp->rq_arg.len >> 2; 1047260c1d12STom Tucker dr->xprt_hlen = rqstp->rq_xprt_hlen; 1048260c1d12STom Tucker 1049260c1d12STom Tucker /* back up head to the start of the buffer and copy */ 1050260c1d12STom Tucker skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; 10510f0257eaSTom Tucker memcpy(dr->args, rqstp->rq_arg.head[0].iov_base - skip, 10520f0257eaSTom Tucker dr->argslen << 2); 10530f0257eaSTom Tucker } 10540f0257eaSTom Tucker svc_xprt_get(rqstp->rq_xprt); 10550f0257eaSTom Tucker dr->xprt = rqstp->rq_xprt; 10569e701c61SJ. Bruce Fields rqstp->rq_dropme = true; 10570f0257eaSTom Tucker 10580f0257eaSTom Tucker dr->handle.revisit = svc_revisit; 10590f0257eaSTom Tucker return &dr->handle; 10600f0257eaSTom Tucker } 10610f0257eaSTom Tucker 10620f0257eaSTom Tucker /* 10630f0257eaSTom Tucker * recv data from a deferred request into an active one 10640f0257eaSTom Tucker */ 10650f0257eaSTom Tucker static int svc_deferred_recv(struct svc_rqst *rqstp) 10660f0257eaSTom Tucker { 10670f0257eaSTom Tucker struct svc_deferred_req *dr = rqstp->rq_deferred; 10680f0257eaSTom Tucker 1069260c1d12STom Tucker /* setup iov_base past transport header */ 1070260c1d12STom Tucker rqstp->rq_arg.head[0].iov_base = dr->args + (dr->xprt_hlen>>2); 1071260c1d12STom Tucker /* The iov_len does not include the transport header bytes */ 1072260c1d12STom Tucker rqstp->rq_arg.head[0].iov_len = (dr->argslen<<2) - dr->xprt_hlen; 10730f0257eaSTom Tucker rqstp->rq_arg.page_len = 0; 1074260c1d12STom Tucker /* The rq_arg.len includes the transport header bytes */ 10750f0257eaSTom Tucker rqstp->rq_arg.len = dr->argslen<<2; 10760f0257eaSTom Tucker rqstp->rq_prot = dr->prot; 10770f0257eaSTom Tucker memcpy(&rqstp->rq_addr, &dr->addr, dr->addrlen); 10780f0257eaSTom Tucker rqstp->rq_addrlen = dr->addrlen; 1079260c1d12STom Tucker /* Save off transport header len in case we get deferred again */ 1080260c1d12STom Tucker rqstp->rq_xprt_hlen = dr->xprt_hlen; 10810f0257eaSTom Tucker rqstp->rq_daddr = dr->daddr; 10820f0257eaSTom Tucker rqstp->rq_respages = rqstp->rq_pages; 1083260c1d12STom Tucker return (dr->argslen<<2) - dr->xprt_hlen; 10840f0257eaSTom Tucker } 10850f0257eaSTom Tucker 10860f0257eaSTom Tucker 10870f0257eaSTom Tucker static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt) 10880f0257eaSTom Tucker { 10890f0257eaSTom Tucker struct svc_deferred_req *dr = NULL; 10900f0257eaSTom Tucker 10910f0257eaSTom Tucker if (!test_bit(XPT_DEFERRED, &xprt->xpt_flags)) 10920f0257eaSTom Tucker return NULL; 10930f0257eaSTom Tucker spin_lock(&xprt->xpt_lock); 10940f0257eaSTom Tucker if (!list_empty(&xprt->xpt_deferred)) { 10950f0257eaSTom Tucker dr = list_entry(xprt->xpt_deferred.next, 10960f0257eaSTom Tucker struct svc_deferred_req, 10970f0257eaSTom Tucker handle.recent); 10980f0257eaSTom Tucker list_del_init(&dr->handle.recent); 109962bac4afSJ. Bruce Fields } else 110062bac4afSJ. Bruce Fields clear_bit(XPT_DEFERRED, &xprt->xpt_flags); 11010f0257eaSTom Tucker spin_unlock(&xprt->xpt_lock); 11020f0257eaSTom Tucker return dr; 11030f0257eaSTom Tucker } 11047fcb98d5STom Tucker 1105156e6209SChuck Lever /** 1106156e6209SChuck Lever * svc_find_xprt - find an RPC transport instance 1107156e6209SChuck Lever * @serv: pointer to svc_serv to search 1108156e6209SChuck Lever * @xcl_name: C string containing transport's class name 11094cb54ca2SStanislav Kinsbursky * @net: owner net pointer 1110156e6209SChuck Lever * @af: Address family of transport's local address 1111156e6209SChuck Lever * @port: transport's IP port number 1112156e6209SChuck Lever * 11137fcb98d5STom Tucker * Return the transport instance pointer for the endpoint accepting 11147fcb98d5STom Tucker * connections/peer traffic from the specified transport class, 11157fcb98d5STom Tucker * address family and port. 11167fcb98d5STom Tucker * 11177fcb98d5STom Tucker * Specifying 0 for the address family or port is effectively a 11187fcb98d5STom Tucker * wild-card, and will result in matching the first transport in the 11197fcb98d5STom Tucker * service's list that has a matching class name. 11207fcb98d5STom Tucker */ 1121156e6209SChuck Lever struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name, 11224cb54ca2SStanislav Kinsbursky struct net *net, const sa_family_t af, 11234cb54ca2SStanislav Kinsbursky const unsigned short port) 11247fcb98d5STom Tucker { 11257fcb98d5STom Tucker struct svc_xprt *xprt; 11267fcb98d5STom Tucker struct svc_xprt *found = NULL; 11277fcb98d5STom Tucker 11287fcb98d5STom Tucker /* Sanity check the args */ 1129156e6209SChuck Lever if (serv == NULL || xcl_name == NULL) 11307fcb98d5STom Tucker return found; 11317fcb98d5STom Tucker 11327fcb98d5STom Tucker spin_lock_bh(&serv->sv_lock); 11337fcb98d5STom Tucker list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { 11344cb54ca2SStanislav Kinsbursky if (xprt->xpt_net != net) 11354cb54ca2SStanislav Kinsbursky continue; 11367fcb98d5STom Tucker if (strcmp(xprt->xpt_class->xcl_name, xcl_name)) 11377fcb98d5STom Tucker continue; 11387fcb98d5STom Tucker if (af != AF_UNSPEC && af != xprt->xpt_local.ss_family) 11397fcb98d5STom Tucker continue; 1140156e6209SChuck Lever if (port != 0 && port != svc_xprt_local_port(xprt)) 11417fcb98d5STom Tucker continue; 11427fcb98d5STom Tucker found = xprt; 1143a217813fSTom Tucker svc_xprt_get(xprt); 11447fcb98d5STom Tucker break; 11457fcb98d5STom Tucker } 11467fcb98d5STom Tucker spin_unlock_bh(&serv->sv_lock); 11477fcb98d5STom Tucker return found; 11487fcb98d5STom Tucker } 11497fcb98d5STom Tucker EXPORT_SYMBOL_GPL(svc_find_xprt); 11509571af18STom Tucker 1151335c54bdSChuck Lever static int svc_one_xprt_name(const struct svc_xprt *xprt, 1152335c54bdSChuck Lever char *pos, int remaining) 1153335c54bdSChuck Lever { 1154335c54bdSChuck Lever int len; 1155335c54bdSChuck Lever 1156335c54bdSChuck Lever len = snprintf(pos, remaining, "%s %u\n", 1157335c54bdSChuck Lever xprt->xpt_class->xcl_name, 1158335c54bdSChuck Lever svc_xprt_local_port(xprt)); 1159335c54bdSChuck Lever if (len >= remaining) 1160335c54bdSChuck Lever return -ENAMETOOLONG; 1161335c54bdSChuck Lever return len; 1162335c54bdSChuck Lever } 1163335c54bdSChuck Lever 1164335c54bdSChuck Lever /** 1165335c54bdSChuck Lever * svc_xprt_names - format a buffer with a list of transport names 1166335c54bdSChuck Lever * @serv: pointer to an RPC service 1167335c54bdSChuck Lever * @buf: pointer to a buffer to be filled in 1168335c54bdSChuck Lever * @buflen: length of buffer to be filled in 1169335c54bdSChuck Lever * 1170335c54bdSChuck Lever * Fills in @buf with a string containing a list of transport names, 1171335c54bdSChuck Lever * each name terminated with '\n'. 1172335c54bdSChuck Lever * 1173335c54bdSChuck Lever * Returns positive length of the filled-in string on success; otherwise 1174335c54bdSChuck Lever * a negative errno value is returned if an error occurs. 11759571af18STom Tucker */ 1176335c54bdSChuck Lever int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen) 11779571af18STom Tucker { 11789571af18STom Tucker struct svc_xprt *xprt; 1179335c54bdSChuck Lever int len, totlen; 1180335c54bdSChuck Lever char *pos; 11819571af18STom Tucker 11829571af18STom Tucker /* Sanity check args */ 11839571af18STom Tucker if (!serv) 11849571af18STom Tucker return 0; 11859571af18STom Tucker 11869571af18STom Tucker spin_lock_bh(&serv->sv_lock); 1187335c54bdSChuck Lever 1188335c54bdSChuck Lever pos = buf; 1189335c54bdSChuck Lever totlen = 0; 11909571af18STom Tucker list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { 1191335c54bdSChuck Lever len = svc_one_xprt_name(xprt, pos, buflen - totlen); 1192335c54bdSChuck Lever if (len < 0) { 1193335c54bdSChuck Lever *buf = '\0'; 1194335c54bdSChuck Lever totlen = len; 1195335c54bdSChuck Lever } 1196335c54bdSChuck Lever if (len <= 0) 11979571af18STom Tucker break; 1198335c54bdSChuck Lever 1199335c54bdSChuck Lever pos += len; 12009571af18STom Tucker totlen += len; 12019571af18STom Tucker } 1202335c54bdSChuck Lever 12039571af18STom Tucker spin_unlock_bh(&serv->sv_lock); 12049571af18STom Tucker return totlen; 12059571af18STom Tucker } 12069571af18STom Tucker EXPORT_SYMBOL_GPL(svc_xprt_names); 120703cf6c9fSGreg Banks 120803cf6c9fSGreg Banks 120903cf6c9fSGreg Banks /*----------------------------------------------------------------------------*/ 121003cf6c9fSGreg Banks 121103cf6c9fSGreg Banks static void *svc_pool_stats_start(struct seq_file *m, loff_t *pos) 121203cf6c9fSGreg Banks { 121303cf6c9fSGreg Banks unsigned int pidx = (unsigned int)*pos; 121403cf6c9fSGreg Banks struct svc_serv *serv = m->private; 121503cf6c9fSGreg Banks 121603cf6c9fSGreg Banks dprintk("svc_pool_stats_start, *pidx=%u\n", pidx); 121703cf6c9fSGreg Banks 121803cf6c9fSGreg Banks if (!pidx) 121903cf6c9fSGreg Banks return SEQ_START_TOKEN; 122003cf6c9fSGreg Banks return (pidx > serv->sv_nrpools ? NULL : &serv->sv_pools[pidx-1]); 122103cf6c9fSGreg Banks } 122203cf6c9fSGreg Banks 122303cf6c9fSGreg Banks static void *svc_pool_stats_next(struct seq_file *m, void *p, loff_t *pos) 122403cf6c9fSGreg Banks { 122503cf6c9fSGreg Banks struct svc_pool *pool = p; 122603cf6c9fSGreg Banks struct svc_serv *serv = m->private; 122703cf6c9fSGreg Banks 122803cf6c9fSGreg Banks dprintk("svc_pool_stats_next, *pos=%llu\n", *pos); 122903cf6c9fSGreg Banks 123003cf6c9fSGreg Banks if (p == SEQ_START_TOKEN) { 123103cf6c9fSGreg Banks pool = &serv->sv_pools[0]; 123203cf6c9fSGreg Banks } else { 123303cf6c9fSGreg Banks unsigned int pidx = (pool - &serv->sv_pools[0]); 123403cf6c9fSGreg Banks if (pidx < serv->sv_nrpools-1) 123503cf6c9fSGreg Banks pool = &serv->sv_pools[pidx+1]; 123603cf6c9fSGreg Banks else 123703cf6c9fSGreg Banks pool = NULL; 123803cf6c9fSGreg Banks } 123903cf6c9fSGreg Banks ++*pos; 124003cf6c9fSGreg Banks return pool; 124103cf6c9fSGreg Banks } 124203cf6c9fSGreg Banks 124303cf6c9fSGreg Banks static void svc_pool_stats_stop(struct seq_file *m, void *p) 124403cf6c9fSGreg Banks { 124503cf6c9fSGreg Banks } 124603cf6c9fSGreg Banks 124703cf6c9fSGreg Banks static int svc_pool_stats_show(struct seq_file *m, void *p) 124803cf6c9fSGreg Banks { 124903cf6c9fSGreg Banks struct svc_pool *pool = p; 125003cf6c9fSGreg Banks 125103cf6c9fSGreg Banks if (p == SEQ_START_TOKEN) { 125278c210efSJ. Bruce Fields seq_puts(m, "# pool packets-arrived sockets-enqueued threads-woken threads-timedout\n"); 125303cf6c9fSGreg Banks return 0; 125403cf6c9fSGreg Banks } 125503cf6c9fSGreg Banks 125678c210efSJ. Bruce Fields seq_printf(m, "%u %lu %lu %lu %lu\n", 125703cf6c9fSGreg Banks pool->sp_id, 125803cf6c9fSGreg Banks pool->sp_stats.packets, 125903cf6c9fSGreg Banks pool->sp_stats.sockets_queued, 126003cf6c9fSGreg Banks pool->sp_stats.threads_woken, 126103cf6c9fSGreg Banks pool->sp_stats.threads_timedout); 126203cf6c9fSGreg Banks 126303cf6c9fSGreg Banks return 0; 126403cf6c9fSGreg Banks } 126503cf6c9fSGreg Banks 126603cf6c9fSGreg Banks static const struct seq_operations svc_pool_stats_seq_ops = { 126703cf6c9fSGreg Banks .start = svc_pool_stats_start, 126803cf6c9fSGreg Banks .next = svc_pool_stats_next, 126903cf6c9fSGreg Banks .stop = svc_pool_stats_stop, 127003cf6c9fSGreg Banks .show = svc_pool_stats_show, 127103cf6c9fSGreg Banks }; 127203cf6c9fSGreg Banks 127303cf6c9fSGreg Banks int svc_pool_stats_open(struct svc_serv *serv, struct file *file) 127403cf6c9fSGreg Banks { 127503cf6c9fSGreg Banks int err; 127603cf6c9fSGreg Banks 127703cf6c9fSGreg Banks err = seq_open(file, &svc_pool_stats_seq_ops); 127803cf6c9fSGreg Banks if (!err) 127903cf6c9fSGreg Banks ((struct seq_file *) file->private_data)->private = serv; 128003cf6c9fSGreg Banks return err; 128103cf6c9fSGreg Banks } 128203cf6c9fSGreg Banks EXPORT_SYMBOL(svc_pool_stats_open); 128303cf6c9fSGreg Banks 128403cf6c9fSGreg Banks /*----------------------------------------------------------------------------*/ 1285