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 2116741019cSJ. Bruce Fields /* 2126741019cSJ. Bruce Fields * svc_xprt_received conditionally queues the transport for processing 2136741019cSJ. Bruce Fields * by another thread. The caller must hold the XPT_BUSY bit and must 2146741019cSJ. Bruce Fields * not thereafter touch transport data. 2156741019cSJ. Bruce Fields * 2166741019cSJ. Bruce Fields * Note: XPT_DATA only gets cleared when a read-attempt finds no (or 2176741019cSJ. Bruce Fields * insufficient) data. 2186741019cSJ. Bruce Fields */ 2196741019cSJ. Bruce Fields static void svc_xprt_received(struct svc_xprt *xprt) 2206741019cSJ. Bruce Fields { 221ff1fdb9bSWeston Andros Adamson WARN_ON_ONCE(!test_bit(XPT_BUSY, &xprt->xpt_flags)); 222ff1fdb9bSWeston Andros Adamson if (!test_bit(XPT_BUSY, &xprt->xpt_flags)) 223ff1fdb9bSWeston Andros Adamson return; 2246741019cSJ. Bruce Fields /* As soon as we clear busy, the xprt could be closed and 2256741019cSJ. Bruce Fields * 'put', so we need a reference to call svc_xprt_enqueue with: 2266741019cSJ. Bruce Fields */ 2276741019cSJ. Bruce Fields svc_xprt_get(xprt); 2286741019cSJ. Bruce Fields clear_bit(XPT_BUSY, &xprt->xpt_flags); 2296741019cSJ. Bruce Fields svc_xprt_enqueue(xprt); 2306741019cSJ. Bruce Fields svc_xprt_put(xprt); 2316741019cSJ. Bruce Fields } 2326741019cSJ. Bruce Fields 23339b55301SJ. Bruce Fields void svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *new) 23439b55301SJ. Bruce Fields { 23539b55301SJ. Bruce Fields clear_bit(XPT_TEMP, &new->xpt_flags); 23639b55301SJ. Bruce Fields spin_lock_bh(&serv->sv_lock); 23739b55301SJ. Bruce Fields list_add(&new->xpt_list, &serv->sv_permsocks); 23839b55301SJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 23939b55301SJ. Bruce Fields svc_xprt_received(new); 24039b55301SJ. Bruce Fields } 24139b55301SJ. Bruce Fields 2429652ada3SChuck Lever int svc_create_xprt(struct svc_serv *serv, const char *xprt_name, 243fc5d00b0SPavel Emelyanov struct net *net, const int family, 244fc5d00b0SPavel Emelyanov const unsigned short port, int flags) 2455dd248f6SChuck Lever { 2465dd248f6SChuck Lever struct svc_xprt_class *xcl; 2475dd248f6SChuck Lever 248b700cbb1STom Tucker dprintk("svc: creating transport %s[%d]\n", xprt_name, port); 249b700cbb1STom Tucker spin_lock(&svc_xprt_class_lock); 250b700cbb1STom Tucker list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) { 251b700cbb1STom Tucker struct svc_xprt *newxprt; 252ed2849d3SNeilBrown unsigned short newport; 2534e5caaa5STom Tucker 2544e5caaa5STom Tucker if (strcmp(xprt_name, xcl->xcl_name)) 2554e5caaa5STom Tucker continue; 2564e5caaa5STom Tucker 2574e5caaa5STom Tucker if (!try_module_get(xcl->xcl_owner)) 2584e5caaa5STom Tucker goto err; 2594e5caaa5STom Tucker 2604e5caaa5STom Tucker spin_unlock(&svc_xprt_class_lock); 26162832c03SPavel Emelyanov newxprt = __svc_xpo_create(xcl, serv, net, family, port, flags); 262b700cbb1STom Tucker if (IS_ERR(newxprt)) { 263b700cbb1STom Tucker module_put(xcl->xcl_owner); 2644e5caaa5STom Tucker return PTR_ERR(newxprt); 265b700cbb1STom Tucker } 26639b55301SJ. Bruce Fields svc_add_new_perm_xprt(serv, newxprt); 267ed2849d3SNeilBrown newport = svc_xprt_local_port(newxprt); 268ed2849d3SNeilBrown return newport; 269b700cbb1STom Tucker } 2704e5caaa5STom Tucker err: 271b700cbb1STom Tucker spin_unlock(&svc_xprt_class_lock); 272b700cbb1STom Tucker dprintk("svc: transport %s not found\n", xprt_name); 27368717908SChuck Lever 27468717908SChuck Lever /* This errno is exposed to user space. Provide a reasonable 27568717908SChuck Lever * perror msg for a bad transport. */ 27668717908SChuck Lever return -EPROTONOSUPPORT; 277b700cbb1STom Tucker } 278b700cbb1STom Tucker EXPORT_SYMBOL_GPL(svc_create_xprt); 2799dbc240fSTom Tucker 2809dbc240fSTom Tucker /* 2819dbc240fSTom Tucker * Copy the local and remote xprt addresses to the rqstp structure 2829dbc240fSTom Tucker */ 2839dbc240fSTom Tucker void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt) 2849dbc240fSTom Tucker { 2859dbc240fSTom Tucker memcpy(&rqstp->rq_addr, &xprt->xpt_remote, xprt->xpt_remotelen); 2869dbc240fSTom Tucker rqstp->rq_addrlen = xprt->xpt_remotelen; 2879dbc240fSTom Tucker 2889dbc240fSTom Tucker /* 2899dbc240fSTom Tucker * Destination address in request is needed for binding the 2909dbc240fSTom Tucker * source address in RPC replies/callbacks later. 2919dbc240fSTom Tucker */ 292849a1cf1SMi Jinlong memcpy(&rqstp->rq_daddr, &xprt->xpt_local, xprt->xpt_locallen); 293849a1cf1SMi Jinlong rqstp->rq_daddrlen = xprt->xpt_locallen; 2949dbc240fSTom Tucker } 2959dbc240fSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs); 2969dbc240fSTom Tucker 2970f0257eaSTom Tucker /** 2980f0257eaSTom Tucker * svc_print_addr - Format rq_addr field for printing 2990f0257eaSTom Tucker * @rqstp: svc_rqst struct containing address to print 3000f0257eaSTom Tucker * @buf: target buffer for formatted address 3010f0257eaSTom Tucker * @len: length of target buffer 3020f0257eaSTom Tucker * 3030f0257eaSTom Tucker */ 3040f0257eaSTom Tucker char *svc_print_addr(struct svc_rqst *rqstp, char *buf, size_t len) 3050f0257eaSTom Tucker { 3060f0257eaSTom Tucker return __svc_print_addr(svc_addr(rqstp), buf, len); 3070f0257eaSTom Tucker } 3080f0257eaSTom Tucker EXPORT_SYMBOL_GPL(svc_print_addr); 3090f0257eaSTom Tucker 3100f0257eaSTom Tucker /* 3110f0257eaSTom Tucker * Queue up an idle server thread. Must have pool->sp_lock held. 3120f0257eaSTom Tucker * Note: this is really a stack rather than a queue, so that we only 3130f0257eaSTom Tucker * use as many different threads as we need, and the rest don't pollute 3140f0257eaSTom Tucker * the cache. 3150f0257eaSTom Tucker */ 3160f0257eaSTom Tucker static void svc_thread_enqueue(struct svc_pool *pool, struct svc_rqst *rqstp) 3170f0257eaSTom Tucker { 3180f0257eaSTom Tucker list_add(&rqstp->rq_list, &pool->sp_threads); 3190f0257eaSTom Tucker } 3200f0257eaSTom Tucker 3210f0257eaSTom Tucker /* 3220f0257eaSTom Tucker * Dequeue an nfsd thread. Must have pool->sp_lock held. 3230f0257eaSTom Tucker */ 3240f0257eaSTom Tucker static void svc_thread_dequeue(struct svc_pool *pool, struct svc_rqst *rqstp) 3250f0257eaSTom Tucker { 3260f0257eaSTom Tucker list_del(&rqstp->rq_list); 3270f0257eaSTom Tucker } 3280f0257eaSTom Tucker 3299c335c0bSJ. Bruce Fields static bool svc_xprt_has_something_to_do(struct svc_xprt *xprt) 3309c335c0bSJ. Bruce Fields { 3319c335c0bSJ. Bruce Fields if (xprt->xpt_flags & ((1<<XPT_CONN)|(1<<XPT_CLOSE))) 3329c335c0bSJ. Bruce Fields return true; 3339c335c0bSJ. Bruce Fields if (xprt->xpt_flags & ((1<<XPT_DATA)|(1<<XPT_DEFERRED))) 3349c335c0bSJ. Bruce Fields return xprt->xpt_ops->xpo_has_wspace(xprt); 3359c335c0bSJ. Bruce Fields return false; 3369c335c0bSJ. Bruce Fields } 3379c335c0bSJ. Bruce Fields 3380f0257eaSTom Tucker /* 3390f0257eaSTom Tucker * Queue up a transport with data pending. If there are idle nfsd 3400f0257eaSTom Tucker * processes, wake 'em up. 3410f0257eaSTom Tucker * 3420f0257eaSTom Tucker */ 3430f0257eaSTom Tucker void svc_xprt_enqueue(struct svc_xprt *xprt) 3440f0257eaSTom Tucker { 3450f0257eaSTom Tucker struct svc_pool *pool; 3460f0257eaSTom Tucker struct svc_rqst *rqstp; 3470f0257eaSTom Tucker int cpu; 3480f0257eaSTom Tucker 3499c335c0bSJ. Bruce Fields if (!svc_xprt_has_something_to_do(xprt)) 3500f0257eaSTom Tucker return; 3510f0257eaSTom Tucker 3520f0257eaSTom Tucker cpu = get_cpu(); 3530f0257eaSTom Tucker pool = svc_pool_for_cpu(xprt->xpt_server, cpu); 3540f0257eaSTom Tucker put_cpu(); 3550f0257eaSTom Tucker 3560f0257eaSTom Tucker spin_lock_bh(&pool->sp_lock); 3570f0257eaSTom Tucker 35878c210efSJ. Bruce Fields if (!list_empty(&pool->sp_threads) && 35978c210efSJ. Bruce Fields !list_empty(&pool->sp_sockets)) 36078c210efSJ. Bruce Fields printk(KERN_ERR 36178c210efSJ. Bruce Fields "svc_xprt_enqueue: " 36278c210efSJ. Bruce Fields "threads and transports both waiting??\n"); 36378c210efSJ. Bruce Fields 36403cf6c9fSGreg Banks pool->sp_stats.packets++; 36503cf6c9fSGreg Banks 3660f0257eaSTom Tucker /* Mark transport as busy. It will remain in this state until 3670f0257eaSTom Tucker * the provider calls svc_xprt_received. We update XPT_BUSY 3680f0257eaSTom Tucker * atomically because it also guards against trying to enqueue 3690f0257eaSTom Tucker * the transport twice. 3700f0257eaSTom Tucker */ 3710f0257eaSTom Tucker if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) { 3720f0257eaSTom Tucker /* Don't enqueue transport while already enqueued */ 3730f0257eaSTom Tucker dprintk("svc: transport %p busy, not enqueued\n", xprt); 3740f0257eaSTom Tucker goto out_unlock; 3750f0257eaSTom Tucker } 3760f0257eaSTom Tucker 37778c210efSJ. Bruce Fields if (!list_empty(&pool->sp_threads)) { 3780f0257eaSTom Tucker rqstp = list_entry(pool->sp_threads.next, 3790f0257eaSTom Tucker struct svc_rqst, 3800f0257eaSTom Tucker rq_list); 3810f0257eaSTom Tucker dprintk("svc: transport %p served by daemon %p\n", 3820f0257eaSTom Tucker xprt, rqstp); 3830f0257eaSTom Tucker svc_thread_dequeue(pool, rqstp); 3840f0257eaSTom Tucker if (rqstp->rq_xprt) 3850f0257eaSTom Tucker printk(KERN_ERR 3860f0257eaSTom Tucker "svc_xprt_enqueue: server %p, rq_xprt=%p!\n", 3870f0257eaSTom Tucker rqstp, rqstp->rq_xprt); 3880f0257eaSTom Tucker rqstp->rq_xprt = xprt; 3890f0257eaSTom Tucker svc_xprt_get(xprt); 39003cf6c9fSGreg Banks pool->sp_stats.threads_woken++; 3910f0257eaSTom Tucker wake_up(&rqstp->rq_wait); 3920f0257eaSTom Tucker } else { 3930f0257eaSTom Tucker dprintk("svc: transport %p put into queue\n", xprt); 3940f0257eaSTom Tucker list_add_tail(&xprt->xpt_ready, &pool->sp_sockets); 39503cf6c9fSGreg Banks pool->sp_stats.sockets_queued++; 3960f0257eaSTom Tucker } 3970f0257eaSTom Tucker 3980f0257eaSTom Tucker out_unlock: 3990f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 4000f0257eaSTom Tucker } 4010f0257eaSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_enqueue); 4020f0257eaSTom Tucker 4030f0257eaSTom Tucker /* 4040f0257eaSTom Tucker * Dequeue the first transport. Must be called with the pool->sp_lock held. 4050f0257eaSTom Tucker */ 4060f0257eaSTom Tucker static struct svc_xprt *svc_xprt_dequeue(struct svc_pool *pool) 4070f0257eaSTom Tucker { 4080f0257eaSTom Tucker struct svc_xprt *xprt; 4090f0257eaSTom Tucker 4100f0257eaSTom Tucker if (list_empty(&pool->sp_sockets)) 4110f0257eaSTom Tucker return NULL; 4120f0257eaSTom Tucker 4130f0257eaSTom Tucker xprt = list_entry(pool->sp_sockets.next, 4140f0257eaSTom Tucker struct svc_xprt, xpt_ready); 4150f0257eaSTom Tucker list_del_init(&xprt->xpt_ready); 4160f0257eaSTom Tucker 4170f0257eaSTom Tucker dprintk("svc: transport %p dequeued, inuse=%d\n", 4180f0257eaSTom Tucker xprt, atomic_read(&xprt->xpt_ref.refcount)); 4190f0257eaSTom Tucker 4200f0257eaSTom Tucker return xprt; 4210f0257eaSTom Tucker } 4220f0257eaSTom Tucker 4230f0257eaSTom Tucker /** 4240f0257eaSTom Tucker * svc_reserve - change the space reserved for the reply to a request. 4250f0257eaSTom Tucker * @rqstp: The request in question 4260f0257eaSTom Tucker * @space: new max space to reserve 4270f0257eaSTom Tucker * 4280f0257eaSTom Tucker * Each request reserves some space on the output queue of the transport 4290f0257eaSTom Tucker * to make sure the reply fits. This function reduces that reserved 4300f0257eaSTom Tucker * space to be the amount of space used already, plus @space. 4310f0257eaSTom Tucker * 4320f0257eaSTom Tucker */ 4330f0257eaSTom Tucker void svc_reserve(struct svc_rqst *rqstp, int space) 4340f0257eaSTom Tucker { 4350f0257eaSTom Tucker space += rqstp->rq_res.head[0].iov_len; 4360f0257eaSTom Tucker 4370f0257eaSTom Tucker if (space < rqstp->rq_reserved) { 4380f0257eaSTom Tucker struct svc_xprt *xprt = rqstp->rq_xprt; 4390f0257eaSTom Tucker atomic_sub((rqstp->rq_reserved - space), &xprt->xpt_reserved); 4400f0257eaSTom Tucker rqstp->rq_reserved = space; 4410f0257eaSTom Tucker 4420f0257eaSTom Tucker svc_xprt_enqueue(xprt); 4430f0257eaSTom Tucker } 4440f0257eaSTom Tucker } 44524c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_reserve); 4460f0257eaSTom Tucker 4470f0257eaSTom Tucker static void svc_xprt_release(struct svc_rqst *rqstp) 4480f0257eaSTom Tucker { 4490f0257eaSTom Tucker struct svc_xprt *xprt = rqstp->rq_xprt; 4500f0257eaSTom Tucker 4510f0257eaSTom Tucker rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); 4520f0257eaSTom Tucker 4532779e3aeSTom Tucker kfree(rqstp->rq_deferred); 4542779e3aeSTom Tucker rqstp->rq_deferred = NULL; 4552779e3aeSTom Tucker 4560f0257eaSTom Tucker svc_free_res_pages(rqstp); 4570f0257eaSTom Tucker rqstp->rq_res.page_len = 0; 4580f0257eaSTom Tucker rqstp->rq_res.page_base = 0; 4590f0257eaSTom Tucker 4600f0257eaSTom Tucker /* Reset response buffer and release 4610f0257eaSTom Tucker * the reservation. 4620f0257eaSTom Tucker * But first, check that enough space was reserved 4630f0257eaSTom Tucker * for the reply, otherwise we have a bug! 4640f0257eaSTom Tucker */ 4650f0257eaSTom Tucker if ((rqstp->rq_res.len) > rqstp->rq_reserved) 4660f0257eaSTom Tucker printk(KERN_ERR "RPC request reserved %d but used %d\n", 4670f0257eaSTom Tucker rqstp->rq_reserved, 4680f0257eaSTom Tucker rqstp->rq_res.len); 4690f0257eaSTom Tucker 4700f0257eaSTom Tucker rqstp->rq_res.head[0].iov_len = 0; 4710f0257eaSTom Tucker svc_reserve(rqstp, 0); 4720f0257eaSTom Tucker rqstp->rq_xprt = NULL; 4730f0257eaSTom Tucker 4740f0257eaSTom Tucker svc_xprt_put(xprt); 4750f0257eaSTom Tucker } 4760f0257eaSTom Tucker 4770f0257eaSTom Tucker /* 4780f0257eaSTom Tucker * External function to wake up a server waiting for data 4790f0257eaSTom Tucker * This really only makes sense for services like lockd 4800f0257eaSTom Tucker * which have exactly one thread anyway. 4810f0257eaSTom Tucker */ 4820f0257eaSTom Tucker void svc_wake_up(struct svc_serv *serv) 4830f0257eaSTom Tucker { 4840f0257eaSTom Tucker struct svc_rqst *rqstp; 4850f0257eaSTom Tucker unsigned int i; 4860f0257eaSTom Tucker struct svc_pool *pool; 4870f0257eaSTom Tucker 4880f0257eaSTom Tucker for (i = 0; i < serv->sv_nrpools; i++) { 4890f0257eaSTom Tucker pool = &serv->sv_pools[i]; 4900f0257eaSTom Tucker 4910f0257eaSTom Tucker spin_lock_bh(&pool->sp_lock); 4920f0257eaSTom Tucker if (!list_empty(&pool->sp_threads)) { 4930f0257eaSTom Tucker rqstp = list_entry(pool->sp_threads.next, 4940f0257eaSTom Tucker struct svc_rqst, 4950f0257eaSTom Tucker rq_list); 4960f0257eaSTom Tucker dprintk("svc: daemon %p woken up.\n", rqstp); 4970f0257eaSTom Tucker /* 4980f0257eaSTom Tucker svc_thread_dequeue(pool, rqstp); 4990f0257eaSTom Tucker rqstp->rq_xprt = NULL; 5000f0257eaSTom Tucker */ 5010f0257eaSTom Tucker wake_up(&rqstp->rq_wait); 50235525b79SAndriy Skulysh } else 50335525b79SAndriy Skulysh pool->sp_task_pending = 1; 5040f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 5050f0257eaSTom Tucker } 5060f0257eaSTom Tucker } 50724c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_wake_up); 5080f0257eaSTom Tucker 5090f0257eaSTom Tucker int svc_port_is_privileged(struct sockaddr *sin) 5100f0257eaSTom Tucker { 5110f0257eaSTom Tucker switch (sin->sa_family) { 5120f0257eaSTom Tucker case AF_INET: 5130f0257eaSTom Tucker return ntohs(((struct sockaddr_in *)sin)->sin_port) 5140f0257eaSTom Tucker < PROT_SOCK; 5150f0257eaSTom Tucker case AF_INET6: 5160f0257eaSTom Tucker return ntohs(((struct sockaddr_in6 *)sin)->sin6_port) 5170f0257eaSTom Tucker < PROT_SOCK; 5180f0257eaSTom Tucker default: 5190f0257eaSTom Tucker return 0; 5200f0257eaSTom Tucker } 5210f0257eaSTom Tucker } 5220f0257eaSTom Tucker 5230f0257eaSTom Tucker /* 524c9233eb7SJeff Layton * Make sure that we don't have too many active connections. If we have, 525c9233eb7SJeff Layton * something must be dropped. It's not clear what will happen if we allow 526c9233eb7SJeff Layton * "too many" connections, but when dealing with network-facing software, 527c9233eb7SJeff Layton * we have to code defensively. Here we do that by imposing hard limits. 5280f0257eaSTom Tucker * 5290f0257eaSTom Tucker * There's no point in trying to do random drop here for DoS 5300f0257eaSTom Tucker * prevention. The NFS clients does 1 reconnect in 15 seconds. An 5310f0257eaSTom Tucker * attacker can easily beat that. 5320f0257eaSTom Tucker * 5330f0257eaSTom Tucker * The only somewhat efficient mechanism would be if drop old 5340f0257eaSTom Tucker * connections from the same IP first. But right now we don't even 5350f0257eaSTom Tucker * record the client IP in svc_sock. 536c9233eb7SJeff Layton * 537c9233eb7SJeff Layton * single-threaded services that expect a lot of clients will probably 538c9233eb7SJeff Layton * need to set sv_maxconn to override the default value which is based 539c9233eb7SJeff Layton * on the number of threads 5400f0257eaSTom Tucker */ 5410f0257eaSTom Tucker static void svc_check_conn_limits(struct svc_serv *serv) 5420f0257eaSTom Tucker { 543c9233eb7SJeff Layton unsigned int limit = serv->sv_maxconn ? serv->sv_maxconn : 544c9233eb7SJeff Layton (serv->sv_nrthreads+3) * 20; 545c9233eb7SJeff Layton 546c9233eb7SJeff Layton if (serv->sv_tmpcnt > limit) { 5470f0257eaSTom Tucker struct svc_xprt *xprt = NULL; 5480f0257eaSTom Tucker spin_lock_bh(&serv->sv_lock); 5490f0257eaSTom Tucker if (!list_empty(&serv->sv_tempsocks)) { 5500f0257eaSTom Tucker /* Try to help the admin */ 551e87cc472SJoe Perches net_notice_ratelimited("%s: too many open connections, consider increasing the %s\n", 552c9233eb7SJeff Layton serv->sv_name, serv->sv_maxconn ? 553e87cc472SJoe Perches "max number of connections" : 554e87cc472SJoe Perches "number of threads"); 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 5746797fa5aSJ. Bruce Fields int svc_alloc_arg(struct svc_rqst *rqstp) 5750f0257eaSTom Tucker { 5760f0257eaSTom Tucker struct svc_serv *serv = rqstp->rq_server; 5770f0257eaSTom Tucker struct xdr_buf *arg; 5786797fa5aSJ. Bruce Fields int pages; 5796797fa5aSJ. Bruce Fields int i; 5800f0257eaSTom Tucker 5810f0257eaSTom Tucker /* now allocate needed pages. If we get a failure, sleep briefly */ 5820f0257eaSTom Tucker pages = (serv->sv_max_mesg + PAGE_SIZE) / PAGE_SIZE; 583b25cd058SWeston Andros Adamson WARN_ON_ONCE(pages >= RPCSVC_MAXPAGES); 584b25cd058SWeston Andros Adamson if (pages >= RPCSVC_MAXPAGES) 585b25cd058SWeston Andros Adamson /* use as many pages as possible */ 586b25cd058SWeston Andros Adamson pages = RPCSVC_MAXPAGES - 1; 5870f0257eaSTom Tucker for (i = 0; i < pages ; i++) 5880f0257eaSTom Tucker while (rqstp->rq_pages[i] == NULL) { 5890f0257eaSTom Tucker struct page *p = alloc_page(GFP_KERNEL); 5900f0257eaSTom Tucker if (!p) { 5917b54fe61SJeff Layton set_current_state(TASK_INTERRUPTIBLE); 5927b54fe61SJeff Layton if (signalled() || kthread_should_stop()) { 5937b54fe61SJeff Layton set_current_state(TASK_RUNNING); 5947086721fSJeff Layton return -EINTR; 5957b54fe61SJeff Layton } 5967b54fe61SJeff Layton schedule_timeout(msecs_to_jiffies(500)); 5970f0257eaSTom Tucker } 5980f0257eaSTom Tucker rqstp->rq_pages[i] = p; 5990f0257eaSTom Tucker } 6000f0257eaSTom Tucker rqstp->rq_pages[i++] = NULL; /* this might be seen in nfs_read_actor */ 6010f0257eaSTom Tucker 6020f0257eaSTom Tucker /* Make arg->head point to first page and arg->pages point to rest */ 6030f0257eaSTom Tucker arg = &rqstp->rq_arg; 6040f0257eaSTom Tucker arg->head[0].iov_base = page_address(rqstp->rq_pages[0]); 6050f0257eaSTom Tucker arg->head[0].iov_len = PAGE_SIZE; 6060f0257eaSTom Tucker arg->pages = rqstp->rq_pages + 1; 6070f0257eaSTom Tucker arg->page_base = 0; 6080f0257eaSTom Tucker /* save at least one page for response */ 6090f0257eaSTom Tucker arg->page_len = (pages-2)*PAGE_SIZE; 6100f0257eaSTom Tucker arg->len = (pages-1)*PAGE_SIZE; 6110f0257eaSTom Tucker arg->tail[0].iov_len = 0; 6126797fa5aSJ. Bruce Fields return 0; 6136797fa5aSJ. Bruce Fields } 6140f0257eaSTom Tucker 6156797fa5aSJ. Bruce Fields struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout) 6166797fa5aSJ. Bruce Fields { 6176797fa5aSJ. Bruce Fields struct svc_xprt *xprt; 6186797fa5aSJ. Bruce Fields struct svc_pool *pool = rqstp->rq_pool; 6196797fa5aSJ. Bruce Fields DECLARE_WAITQUEUE(wait, current); 6206797fa5aSJ. Bruce Fields long time_left; 6210f0257eaSTom Tucker 622f16b6e8dSNeilBrown /* Normally we will wait up to 5 seconds for any required 623f16b6e8dSNeilBrown * cache information to be provided. 624f16b6e8dSNeilBrown */ 625f16b6e8dSNeilBrown rqstp->rq_chandle.thread_wait = 5*HZ; 626f16b6e8dSNeilBrown 6270f0257eaSTom Tucker spin_lock_bh(&pool->sp_lock); 6280f0257eaSTom Tucker xprt = svc_xprt_dequeue(pool); 6290f0257eaSTom Tucker if (xprt) { 6300f0257eaSTom Tucker rqstp->rq_xprt = xprt; 6310f0257eaSTom Tucker svc_xprt_get(xprt); 632f16b6e8dSNeilBrown 633f16b6e8dSNeilBrown /* As there is a shortage of threads and this request 6346610f720SJ. Bruce Fields * had to be queued, don't allow the thread to wait so 635f16b6e8dSNeilBrown * long for cache updates. 636f16b6e8dSNeilBrown */ 637f16b6e8dSNeilBrown rqstp->rq_chandle.thread_wait = 1*HZ; 63835525b79SAndriy Skulysh pool->sp_task_pending = 0; 6390f0257eaSTom Tucker } else { 64035525b79SAndriy Skulysh if (pool->sp_task_pending) { 64135525b79SAndriy Skulysh pool->sp_task_pending = 0; 64235525b79SAndriy Skulysh spin_unlock_bh(&pool->sp_lock); 64335525b79SAndriy Skulysh return ERR_PTR(-EAGAIN); 64435525b79SAndriy Skulysh } 6450f0257eaSTom Tucker /* No data pending. Go to sleep */ 6460f0257eaSTom Tucker svc_thread_enqueue(pool, rqstp); 6470f0257eaSTom Tucker 6480f0257eaSTom Tucker /* 6490f0257eaSTom Tucker * We have to be able to interrupt this wait 6500f0257eaSTom Tucker * to bring down the daemons ... 6510f0257eaSTom Tucker */ 6520f0257eaSTom Tucker set_current_state(TASK_INTERRUPTIBLE); 6537086721fSJeff Layton 6547086721fSJeff Layton /* 6557086721fSJeff Layton * checking kthread_should_stop() here allows us to avoid 6567086721fSJeff Layton * locking and signalling when stopping kthreads that call 6577086721fSJeff Layton * svc_recv. If the thread has already been woken up, then 6587086721fSJeff Layton * we can exit here without sleeping. If not, then it 6597086721fSJeff Layton * it'll be woken up quickly during the schedule_timeout 6607086721fSJeff Layton */ 6617086721fSJeff Layton if (kthread_should_stop()) { 6627086721fSJeff Layton set_current_state(TASK_RUNNING); 6637086721fSJeff Layton spin_unlock_bh(&pool->sp_lock); 6646797fa5aSJ. Bruce Fields return ERR_PTR(-EINTR); 6657086721fSJeff Layton } 6667086721fSJeff Layton 6670f0257eaSTom Tucker add_wait_queue(&rqstp->rq_wait, &wait); 6680f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 6690f0257eaSTom Tucker 67003cf6c9fSGreg Banks time_left = schedule_timeout(timeout); 6710f0257eaSTom Tucker 6720f0257eaSTom Tucker try_to_freeze(); 6730f0257eaSTom Tucker 6740f0257eaSTom Tucker spin_lock_bh(&pool->sp_lock); 6750f0257eaSTom Tucker remove_wait_queue(&rqstp->rq_wait, &wait); 67603cf6c9fSGreg Banks if (!time_left) 67703cf6c9fSGreg Banks pool->sp_stats.threads_timedout++; 6780f0257eaSTom Tucker 6790f0257eaSTom Tucker xprt = rqstp->rq_xprt; 6800f0257eaSTom Tucker if (!xprt) { 6810f0257eaSTom Tucker svc_thread_dequeue(pool, rqstp); 6820f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 6830f0257eaSTom Tucker dprintk("svc: server %p, no data yet\n", rqstp); 6847086721fSJeff Layton if (signalled() || kthread_should_stop()) 6856797fa5aSJ. Bruce Fields return ERR_PTR(-EINTR); 6867086721fSJeff Layton else 6876797fa5aSJ. Bruce Fields return ERR_PTR(-EAGAIN); 6880f0257eaSTom Tucker } 6890f0257eaSTom Tucker } 6900f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 6916797fa5aSJ. Bruce Fields return xprt; 6926797fa5aSJ. Bruce Fields } 6930f0257eaSTom Tucker 69465b2e665SJ. Bruce Fields void svc_add_new_temp_xprt(struct svc_serv *serv, struct svc_xprt *newxpt) 69565b2e665SJ. Bruce Fields { 69665b2e665SJ. Bruce Fields spin_lock_bh(&serv->sv_lock); 69765b2e665SJ. Bruce Fields set_bit(XPT_TEMP, &newxpt->xpt_flags); 69865b2e665SJ. Bruce Fields list_add(&newxpt->xpt_list, &serv->sv_tempsocks); 69965b2e665SJ. Bruce Fields serv->sv_tmpcnt++; 70065b2e665SJ. Bruce Fields if (serv->sv_temptimer.function == NULL) { 70165b2e665SJ. Bruce Fields /* setup timer to age temp transports */ 70265b2e665SJ. Bruce Fields setup_timer(&serv->sv_temptimer, svc_age_temp_xprts, 70365b2e665SJ. Bruce Fields (unsigned long)serv); 70465b2e665SJ. Bruce Fields mod_timer(&serv->sv_temptimer, 70565b2e665SJ. Bruce Fields jiffies + svc_conn_age_period * HZ); 70665b2e665SJ. Bruce Fields } 70765b2e665SJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 70865b2e665SJ. Bruce Fields svc_xprt_received(newxpt); 70965b2e665SJ. Bruce Fields } 71065b2e665SJ. Bruce Fields 7116797fa5aSJ. Bruce Fields static int svc_handle_xprt(struct svc_rqst *rqstp, struct svc_xprt *xprt) 7126797fa5aSJ. Bruce Fields { 7136797fa5aSJ. Bruce Fields struct svc_serv *serv = rqstp->rq_server; 7146797fa5aSJ. Bruce Fields int len = 0; 7156797fa5aSJ. Bruce Fields 7161b644b6eSJ. Bruce Fields if (test_bit(XPT_CLOSE, &xprt->xpt_flags)) { 7171b644b6eSJ. Bruce Fields dprintk("svc_recv: found XPT_CLOSE\n"); 7181b644b6eSJ. Bruce Fields svc_delete_xprt(xprt); 719ca7896cdSJ. Bruce Fields /* Leave XPT_BUSY set on the dead xprt: */ 7206797fa5aSJ. Bruce Fields return 0; 721ca7896cdSJ. Bruce Fields } 722ca7896cdSJ. Bruce Fields if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) { 7230f0257eaSTom Tucker struct svc_xprt *newxpt; 7240f0257eaSTom Tucker /* 7250f0257eaSTom Tucker * We know this module_get will succeed because the 7260f0257eaSTom Tucker * listener holds a reference too 7270f0257eaSTom Tucker */ 72865b2e665SJ. Bruce Fields __module_get(xprt->xpt_class->xcl_owner); 7290f0257eaSTom Tucker svc_check_conn_limits(xprt->xpt_server); 73065b2e665SJ. Bruce Fields newxpt = xprt->xpt_ops->xpo_accept(xprt); 73165b2e665SJ. Bruce Fields if (newxpt) 73265b2e665SJ. Bruce Fields svc_add_new_temp_xprt(serv, newxpt); 7339c335c0bSJ. Bruce Fields } else if (xprt->xpt_ops->xpo_has_wspace(xprt)) { 7346797fa5aSJ. Bruce Fields /* XPT_DATA|XPT_DEFERRED case: */ 7350f0257eaSTom Tucker dprintk("svc: server %p, pool %u, transport %p, inuse=%d\n", 7366797fa5aSJ. Bruce Fields rqstp, rqstp->rq_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); 744d10f27a7SJ. Bruce Fields rqstp->rq_reserved = serv->sv_max_mesg; 745d10f27a7SJ. Bruce Fields atomic_add(rqstp->rq_reserved, &xprt->xpt_reserved); 7460f0257eaSTom Tucker } 7476797fa5aSJ. Bruce Fields /* clear XPT_BUSY: */ 748ca7896cdSJ. Bruce Fields svc_xprt_received(xprt); 7496797fa5aSJ. Bruce Fields return len; 7506797fa5aSJ. Bruce Fields } 7516797fa5aSJ. Bruce Fields 7526797fa5aSJ. Bruce Fields /* 7536797fa5aSJ. Bruce Fields * Receive the next request on any transport. This code is carefully 7546797fa5aSJ. Bruce Fields * organised not to touch any cachelines in the shared svc_serv 7556797fa5aSJ. Bruce Fields * structure, only cachelines in the local svc_pool. 7566797fa5aSJ. Bruce Fields */ 7576797fa5aSJ. Bruce Fields int svc_recv(struct svc_rqst *rqstp, long timeout) 7586797fa5aSJ. Bruce Fields { 7596797fa5aSJ. Bruce Fields struct svc_xprt *xprt = NULL; 7606797fa5aSJ. Bruce Fields struct svc_serv *serv = rqstp->rq_server; 7616797fa5aSJ. Bruce Fields int len, err; 7626797fa5aSJ. Bruce Fields 7636797fa5aSJ. Bruce Fields dprintk("svc: server %p waiting for data (to = %ld)\n", 7646797fa5aSJ. Bruce Fields rqstp, timeout); 7656797fa5aSJ. Bruce Fields 7666797fa5aSJ. Bruce Fields if (rqstp->rq_xprt) 7676797fa5aSJ. Bruce Fields printk(KERN_ERR 7686797fa5aSJ. Bruce Fields "svc_recv: service %p, transport not NULL!\n", 7696797fa5aSJ. Bruce Fields rqstp); 7706797fa5aSJ. Bruce Fields if (waitqueue_active(&rqstp->rq_wait)) 7716797fa5aSJ. Bruce Fields printk(KERN_ERR 7726797fa5aSJ. Bruce Fields "svc_recv: service %p, wait queue active!\n", 7736797fa5aSJ. Bruce Fields rqstp); 7746797fa5aSJ. Bruce Fields 7756797fa5aSJ. Bruce Fields err = svc_alloc_arg(rqstp); 7766797fa5aSJ. Bruce Fields if (err) 7776797fa5aSJ. Bruce Fields return err; 7786797fa5aSJ. Bruce Fields 7796797fa5aSJ. Bruce Fields try_to_freeze(); 7806797fa5aSJ. Bruce Fields cond_resched(); 7816797fa5aSJ. Bruce Fields if (signalled() || kthread_should_stop()) 7826797fa5aSJ. Bruce Fields return -EINTR; 7836797fa5aSJ. Bruce Fields 7846797fa5aSJ. Bruce Fields xprt = svc_get_next_xprt(rqstp, timeout); 7856797fa5aSJ. Bruce Fields if (IS_ERR(xprt)) 7866797fa5aSJ. Bruce Fields return PTR_ERR(xprt); 7876797fa5aSJ. Bruce Fields 7886797fa5aSJ. Bruce Fields len = svc_handle_xprt(rqstp, xprt); 7890f0257eaSTom Tucker 7900f0257eaSTom Tucker /* No data, incomplete (TCP) read, or accept() */ 7919f9d2ebeSJ. Bruce Fields if (len <= 0) 792ca7896cdSJ. Bruce Fields goto out; 793ca7896cdSJ. Bruce Fields 7940f0257eaSTom Tucker clear_bit(XPT_OLD, &xprt->xpt_flags); 7950f0257eaSTom Tucker 7960f0257eaSTom Tucker rqstp->rq_secure = svc_port_is_privileged(svc_addr(rqstp)); 7970f0257eaSTom Tucker rqstp->rq_chandle.defer = svc_defer; 7980f0257eaSTom Tucker 7990f0257eaSTom Tucker if (serv->sv_stats) 8000f0257eaSTom Tucker serv->sv_stats->netcnt++; 8010f0257eaSTom Tucker return len; 802ca7896cdSJ. Bruce Fields out: 803ca7896cdSJ. Bruce Fields rqstp->rq_res.len = 0; 804ca7896cdSJ. Bruce Fields svc_xprt_release(rqstp); 805ca7896cdSJ. Bruce Fields return -EAGAIN; 8060f0257eaSTom Tucker } 80724c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_recv); 8080f0257eaSTom Tucker 8090f0257eaSTom Tucker /* 8100f0257eaSTom Tucker * Drop request 8110f0257eaSTom Tucker */ 8120f0257eaSTom Tucker void svc_drop(struct svc_rqst *rqstp) 8130f0257eaSTom Tucker { 8140f0257eaSTom Tucker dprintk("svc: xprt %p dropped request\n", rqstp->rq_xprt); 8150f0257eaSTom Tucker svc_xprt_release(rqstp); 8160f0257eaSTom Tucker } 81724c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_drop); 8180f0257eaSTom Tucker 8190f0257eaSTom Tucker /* 8200f0257eaSTom Tucker * Return reply to client. 8210f0257eaSTom Tucker */ 8220f0257eaSTom Tucker int svc_send(struct svc_rqst *rqstp) 8230f0257eaSTom Tucker { 8240f0257eaSTom Tucker struct svc_xprt *xprt; 8250f0257eaSTom Tucker int len; 8260f0257eaSTom Tucker struct xdr_buf *xb; 8270f0257eaSTom Tucker 8280f0257eaSTom Tucker xprt = rqstp->rq_xprt; 8290f0257eaSTom Tucker if (!xprt) 8300f0257eaSTom Tucker return -EFAULT; 8310f0257eaSTom Tucker 8320f0257eaSTom Tucker /* release the receive skb before sending the reply */ 8330f0257eaSTom Tucker rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); 8340f0257eaSTom Tucker 8350f0257eaSTom Tucker /* calculate over-all length */ 8360f0257eaSTom Tucker xb = &rqstp->rq_res; 8370f0257eaSTom Tucker xb->len = xb->head[0].iov_len + 8380f0257eaSTom Tucker xb->page_len + 8390f0257eaSTom Tucker xb->tail[0].iov_len; 8400f0257eaSTom Tucker 8410f0257eaSTom Tucker /* Grab mutex to serialize outgoing data. */ 8420f0257eaSTom Tucker mutex_lock(&xprt->xpt_mutex); 843f06f00a2SJ. Bruce Fields if (test_bit(XPT_DEAD, &xprt->xpt_flags) 844f06f00a2SJ. Bruce Fields || test_bit(XPT_CLOSE, &xprt->xpt_flags)) 8450f0257eaSTom Tucker len = -ENOTCONN; 8460f0257eaSTom Tucker else 8470f0257eaSTom Tucker len = xprt->xpt_ops->xpo_sendto(rqstp); 8480f0257eaSTom Tucker mutex_unlock(&xprt->xpt_mutex); 8494cfc7e60SRahul Iyer rpc_wake_up(&xprt->xpt_bc_pending); 8500f0257eaSTom Tucker svc_xprt_release(rqstp); 8510f0257eaSTom Tucker 8520f0257eaSTom Tucker if (len == -ECONNREFUSED || len == -ENOTCONN || len == -EAGAIN) 8530f0257eaSTom Tucker return 0; 8540f0257eaSTom Tucker return len; 8550f0257eaSTom Tucker } 8560f0257eaSTom Tucker 8570f0257eaSTom Tucker /* 8580f0257eaSTom Tucker * Timer function to close old temporary transports, using 8590f0257eaSTom Tucker * a mark-and-sweep algorithm. 8600f0257eaSTom Tucker */ 8610f0257eaSTom Tucker static void svc_age_temp_xprts(unsigned long closure) 8620f0257eaSTom Tucker { 8630f0257eaSTom Tucker struct svc_serv *serv = (struct svc_serv *)closure; 8640f0257eaSTom Tucker struct svc_xprt *xprt; 8650f0257eaSTom Tucker struct list_head *le, *next; 8660f0257eaSTom Tucker 8670f0257eaSTom Tucker dprintk("svc_age_temp_xprts\n"); 8680f0257eaSTom Tucker 8690f0257eaSTom Tucker if (!spin_trylock_bh(&serv->sv_lock)) { 8700f0257eaSTom Tucker /* busy, try again 1 sec later */ 8710f0257eaSTom Tucker dprintk("svc_age_temp_xprts: busy\n"); 8720f0257eaSTom Tucker mod_timer(&serv->sv_temptimer, jiffies + HZ); 8730f0257eaSTom Tucker return; 8740f0257eaSTom Tucker } 8750f0257eaSTom Tucker 8760f0257eaSTom Tucker list_for_each_safe(le, next, &serv->sv_tempsocks) { 8770f0257eaSTom Tucker xprt = list_entry(le, struct svc_xprt, xpt_list); 8780f0257eaSTom Tucker 8790f0257eaSTom Tucker /* First time through, just mark it OLD. Second time 8800f0257eaSTom Tucker * through, close it. */ 8810f0257eaSTom Tucker if (!test_and_set_bit(XPT_OLD, &xprt->xpt_flags)) 8820f0257eaSTom Tucker continue; 883f64f9e71SJoe Perches if (atomic_read(&xprt->xpt_ref.refcount) > 1 || 884f64f9e71SJoe Perches test_bit(XPT_BUSY, &xprt->xpt_flags)) 8850f0257eaSTom Tucker continue; 886e75bafbfSJ. Bruce Fields list_del_init(le); 8870f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 8880f0257eaSTom Tucker set_bit(XPT_DETACHED, &xprt->xpt_flags); 8890f0257eaSTom Tucker dprintk("queuing xprt %p for closing\n", xprt); 8900f0257eaSTom Tucker 8910f0257eaSTom Tucker /* a thread will dequeue and close it soon */ 8920f0257eaSTom Tucker svc_xprt_enqueue(xprt); 8930f0257eaSTom Tucker } 894e75bafbfSJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 8950f0257eaSTom Tucker 8960f0257eaSTom Tucker mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ); 8970f0257eaSTom Tucker } 8980f0257eaSTom Tucker 899edc7a894SJ. Bruce Fields static void call_xpt_users(struct svc_xprt *xprt) 900edc7a894SJ. Bruce Fields { 901edc7a894SJ. Bruce Fields struct svc_xpt_user *u; 902edc7a894SJ. Bruce Fields 903edc7a894SJ. Bruce Fields spin_lock(&xprt->xpt_lock); 904edc7a894SJ. Bruce Fields while (!list_empty(&xprt->xpt_users)) { 905edc7a894SJ. Bruce Fields u = list_first_entry(&xprt->xpt_users, struct svc_xpt_user, list); 906edc7a894SJ. Bruce Fields list_del(&u->list); 907edc7a894SJ. Bruce Fields u->callback(u); 908edc7a894SJ. Bruce Fields } 909edc7a894SJ. Bruce Fields spin_unlock(&xprt->xpt_lock); 910edc7a894SJ. Bruce Fields } 911edc7a894SJ. Bruce Fields 9120f0257eaSTom Tucker /* 9130f0257eaSTom Tucker * Remove a dead transport 9140f0257eaSTom Tucker */ 9157710ec36SJ. Bruce Fields static void svc_delete_xprt(struct svc_xprt *xprt) 9160f0257eaSTom Tucker { 9170f0257eaSTom Tucker struct svc_serv *serv = xprt->xpt_server; 91822945e4aSTom Tucker struct svc_deferred_req *dr; 91922945e4aSTom Tucker 92022945e4aSTom Tucker /* Only do this once */ 92122945e4aSTom Tucker if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags)) 922ac9303ebSJ. Bruce Fields BUG(); 9230f0257eaSTom Tucker 9240f0257eaSTom Tucker dprintk("svc: svc_delete_xprt(%p)\n", xprt); 9250f0257eaSTom Tucker xprt->xpt_ops->xpo_detach(xprt); 9260f0257eaSTom Tucker 9270f0257eaSTom Tucker spin_lock_bh(&serv->sv_lock); 9280f0257eaSTom Tucker if (!test_and_set_bit(XPT_DETACHED, &xprt->xpt_flags)) 9290f0257eaSTom Tucker list_del_init(&xprt->xpt_list); 93001047298SWeston Andros Adamson WARN_ON_ONCE(!list_empty(&xprt->xpt_ready)); 9310f0257eaSTom Tucker if (test_bit(XPT_TEMP, &xprt->xpt_flags)) 9320f0257eaSTom Tucker serv->sv_tmpcnt--; 933788e69e5SJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 93422945e4aSTom Tucker 935ab1b18f7SNeil Brown while ((dr = svc_deferred_dequeue(xprt)) != NULL) 93622945e4aSTom Tucker kfree(dr); 93722945e4aSTom Tucker 938edc7a894SJ. Bruce Fields call_xpt_users(xprt); 93922945e4aSTom Tucker svc_xprt_put(xprt); 9400f0257eaSTom Tucker } 9410f0257eaSTom Tucker 9420f0257eaSTom Tucker void svc_close_xprt(struct svc_xprt *xprt) 9430f0257eaSTom Tucker { 9440f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 9450f0257eaSTom Tucker if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) 9460f0257eaSTom Tucker /* someone else will have to effect the close */ 9470f0257eaSTom Tucker return; 948b1763316SJ. Bruce Fields /* 949b1763316SJ. Bruce Fields * We expect svc_close_xprt() to work even when no threads are 950b1763316SJ. Bruce Fields * running (e.g., while configuring the server before starting 951b1763316SJ. Bruce Fields * any threads), so if the transport isn't busy, we delete 952b1763316SJ. Bruce Fields * it ourself: 953b1763316SJ. Bruce Fields */ 9540f0257eaSTom Tucker svc_delete_xprt(xprt); 9550f0257eaSTom Tucker } 956a217813fSTom Tucker EXPORT_SYMBOL_GPL(svc_close_xprt); 9570f0257eaSTom Tucker 958719f8bccSJ. Bruce Fields static void svc_close_list(struct svc_serv *serv, struct list_head *xprt_list, struct net *net) 9590f0257eaSTom Tucker { 9600f0257eaSTom Tucker struct svc_xprt *xprt; 9610f0257eaSTom Tucker 962719f8bccSJ. Bruce Fields spin_lock(&serv->sv_lock); 963b4f36f88SJ. Bruce Fields list_for_each_entry(xprt, xprt_list, xpt_list) { 9647b147f1fSStanislav Kinsbursky if (xprt->xpt_net != net) 9657b147f1fSStanislav Kinsbursky continue; 9660f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 967b4f36f88SJ. Bruce Fields set_bit(XPT_BUSY, &xprt->xpt_flags); 9680f0257eaSTom Tucker } 969719f8bccSJ. Bruce Fields spin_unlock(&serv->sv_lock); 9700f0257eaSTom Tucker } 9710f0257eaSTom Tucker 9727b147f1fSStanislav Kinsbursky static void svc_clear_pools(struct svc_serv *serv, struct net *net) 9732fefb8a0SJ. Bruce Fields { 974b4f36f88SJ. Bruce Fields struct svc_pool *pool; 975b4f36f88SJ. Bruce Fields struct svc_xprt *xprt; 976b4f36f88SJ. Bruce Fields struct svc_xprt *tmp; 977b4f36f88SJ. Bruce Fields int i; 978b4f36f88SJ. Bruce Fields 979b4f36f88SJ. Bruce Fields for (i = 0; i < serv->sv_nrpools; i++) { 980b4f36f88SJ. Bruce Fields pool = &serv->sv_pools[i]; 981b4f36f88SJ. Bruce Fields 982b4f36f88SJ. Bruce Fields spin_lock_bh(&pool->sp_lock); 9836f513365SStanislav Kinsbursky list_for_each_entry_safe(xprt, tmp, &pool->sp_sockets, xpt_ready) { 9847b147f1fSStanislav Kinsbursky if (xprt->xpt_net != net) 9857b147f1fSStanislav Kinsbursky continue; 986b4f36f88SJ. Bruce Fields list_del_init(&xprt->xpt_ready); 987b4f36f88SJ. Bruce Fields } 988b4f36f88SJ. Bruce Fields spin_unlock_bh(&pool->sp_lock); 989b4f36f88SJ. Bruce Fields } 9906f513365SStanislav Kinsbursky } 9916f513365SStanislav Kinsbursky 992719f8bccSJ. Bruce Fields static void svc_clear_list(struct svc_serv *serv, struct list_head *xprt_list, struct net *net) 9936f513365SStanislav Kinsbursky { 9946f513365SStanislav Kinsbursky struct svc_xprt *xprt; 9956f513365SStanislav Kinsbursky struct svc_xprt *tmp; 996719f8bccSJ. Bruce Fields LIST_HEAD(victims); 9976f513365SStanislav Kinsbursky 998719f8bccSJ. Bruce Fields spin_lock(&serv->sv_lock); 9993a22bf50SStanislav Kinsbursky list_for_each_entry_safe(xprt, tmp, xprt_list, xpt_list) { 10007b147f1fSStanislav Kinsbursky if (xprt->xpt_net != net) 10017b147f1fSStanislav Kinsbursky continue; 1002719f8bccSJ. Bruce Fields list_move(&xprt->xpt_list, &victims); 10033a22bf50SStanislav Kinsbursky } 1004719f8bccSJ. Bruce Fields spin_unlock(&serv->sv_lock); 1005719f8bccSJ. Bruce Fields 1006719f8bccSJ. Bruce Fields list_for_each_entry_safe(xprt, tmp, &victims, xpt_list) 1007719f8bccSJ. Bruce Fields svc_delete_xprt(xprt); 10083a22bf50SStanislav Kinsbursky } 10093a22bf50SStanislav Kinsbursky 10107b147f1fSStanislav Kinsbursky void svc_close_net(struct svc_serv *serv, struct net *net) 10113a22bf50SStanislav Kinsbursky { 1012719f8bccSJ. Bruce Fields svc_close_list(serv, &serv->sv_tempsocks, net); 1013719f8bccSJ. Bruce Fields svc_close_list(serv, &serv->sv_permsocks, net); 10146f513365SStanislav Kinsbursky 10157b147f1fSStanislav Kinsbursky svc_clear_pools(serv, net); 1016b4f36f88SJ. Bruce Fields /* 1017b4f36f88SJ. Bruce Fields * At this point the sp_sockets lists will stay empty, since 10183ddbe879SJ. Bruce Fields * svc_xprt_enqueue will not add new entries without taking the 1019b4f36f88SJ. Bruce Fields * sp_lock and checking XPT_BUSY. 1020b4f36f88SJ. Bruce Fields */ 1021719f8bccSJ. Bruce Fields svc_clear_list(serv, &serv->sv_tempsocks, net); 1022719f8bccSJ. Bruce Fields svc_clear_list(serv, &serv->sv_permsocks, net); 10232fefb8a0SJ. Bruce Fields } 10242fefb8a0SJ. Bruce Fields 10250f0257eaSTom Tucker /* 10260f0257eaSTom Tucker * Handle defer and revisit of requests 10270f0257eaSTom Tucker */ 10280f0257eaSTom Tucker 10290f0257eaSTom Tucker static void svc_revisit(struct cache_deferred_req *dreq, int too_many) 10300f0257eaSTom Tucker { 10310f0257eaSTom Tucker struct svc_deferred_req *dr = 10320f0257eaSTom Tucker container_of(dreq, struct svc_deferred_req, handle); 10330f0257eaSTom Tucker struct svc_xprt *xprt = dr->xprt; 10340f0257eaSTom Tucker 103522945e4aSTom Tucker spin_lock(&xprt->xpt_lock); 103622945e4aSTom Tucker set_bit(XPT_DEFERRED, &xprt->xpt_flags); 103722945e4aSTom Tucker if (too_many || test_bit(XPT_DEAD, &xprt->xpt_flags)) { 103822945e4aSTom Tucker spin_unlock(&xprt->xpt_lock); 103922945e4aSTom Tucker dprintk("revisit canceled\n"); 10400f0257eaSTom Tucker svc_xprt_put(xprt); 10410f0257eaSTom Tucker kfree(dr); 10420f0257eaSTom Tucker return; 10430f0257eaSTom Tucker } 10440f0257eaSTom Tucker dprintk("revisit queued\n"); 10450f0257eaSTom Tucker dr->xprt = NULL; 10460f0257eaSTom Tucker list_add(&dr->handle.recent, &xprt->xpt_deferred); 10470f0257eaSTom Tucker spin_unlock(&xprt->xpt_lock); 10480f0257eaSTom Tucker svc_xprt_enqueue(xprt); 10490f0257eaSTom Tucker svc_xprt_put(xprt); 10500f0257eaSTom Tucker } 10510f0257eaSTom Tucker 1052260c1d12STom Tucker /* 1053260c1d12STom Tucker * Save the request off for later processing. The request buffer looks 1054260c1d12STom Tucker * like this: 1055260c1d12STom Tucker * 1056260c1d12STom Tucker * <xprt-header><rpc-header><rpc-pagelist><rpc-tail> 1057260c1d12STom Tucker * 1058260c1d12STom Tucker * This code can only handle requests that consist of an xprt-header 1059260c1d12STom Tucker * and rpc-header. 1060260c1d12STom Tucker */ 10610f0257eaSTom Tucker static struct cache_deferred_req *svc_defer(struct cache_req *req) 10620f0257eaSTom Tucker { 10630f0257eaSTom Tucker struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle); 10640f0257eaSTom Tucker struct svc_deferred_req *dr; 10650f0257eaSTom Tucker 10662f425878SAndy Adamson if (rqstp->rq_arg.page_len || !rqstp->rq_usedeferral) 10670f0257eaSTom Tucker return NULL; /* if more than a page, give up FIXME */ 10680f0257eaSTom Tucker if (rqstp->rq_deferred) { 10690f0257eaSTom Tucker dr = rqstp->rq_deferred; 10700f0257eaSTom Tucker rqstp->rq_deferred = NULL; 10710f0257eaSTom Tucker } else { 1072260c1d12STom Tucker size_t skip; 1073260c1d12STom Tucker size_t size; 10740f0257eaSTom Tucker /* FIXME maybe discard if size too large */ 1075260c1d12STom Tucker size = sizeof(struct svc_deferred_req) + rqstp->rq_arg.len; 10760f0257eaSTom Tucker dr = kmalloc(size, GFP_KERNEL); 10770f0257eaSTom Tucker if (dr == NULL) 10780f0257eaSTom Tucker return NULL; 10790f0257eaSTom Tucker 10800f0257eaSTom Tucker dr->handle.owner = rqstp->rq_server; 10810f0257eaSTom Tucker dr->prot = rqstp->rq_prot; 10820f0257eaSTom Tucker memcpy(&dr->addr, &rqstp->rq_addr, rqstp->rq_addrlen); 10830f0257eaSTom Tucker dr->addrlen = rqstp->rq_addrlen; 10840f0257eaSTom Tucker dr->daddr = rqstp->rq_daddr; 10850f0257eaSTom Tucker dr->argslen = rqstp->rq_arg.len >> 2; 1086260c1d12STom Tucker dr->xprt_hlen = rqstp->rq_xprt_hlen; 1087260c1d12STom Tucker 1088260c1d12STom Tucker /* back up head to the start of the buffer and copy */ 1089260c1d12STom Tucker skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; 10900f0257eaSTom Tucker memcpy(dr->args, rqstp->rq_arg.head[0].iov_base - skip, 10910f0257eaSTom Tucker dr->argslen << 2); 10920f0257eaSTom Tucker } 10930f0257eaSTom Tucker svc_xprt_get(rqstp->rq_xprt); 10940f0257eaSTom Tucker dr->xprt = rqstp->rq_xprt; 10959e701c61SJ. Bruce Fields rqstp->rq_dropme = true; 10960f0257eaSTom Tucker 10970f0257eaSTom Tucker dr->handle.revisit = svc_revisit; 10980f0257eaSTom Tucker return &dr->handle; 10990f0257eaSTom Tucker } 11000f0257eaSTom Tucker 11010f0257eaSTom Tucker /* 11020f0257eaSTom Tucker * recv data from a deferred request into an active one 11030f0257eaSTom Tucker */ 11040f0257eaSTom Tucker static int svc_deferred_recv(struct svc_rqst *rqstp) 11050f0257eaSTom Tucker { 11060f0257eaSTom Tucker struct svc_deferred_req *dr = rqstp->rq_deferred; 11070f0257eaSTom Tucker 1108260c1d12STom Tucker /* setup iov_base past transport header */ 1109260c1d12STom Tucker rqstp->rq_arg.head[0].iov_base = dr->args + (dr->xprt_hlen>>2); 1110260c1d12STom Tucker /* The iov_len does not include the transport header bytes */ 1111260c1d12STom Tucker rqstp->rq_arg.head[0].iov_len = (dr->argslen<<2) - dr->xprt_hlen; 11120f0257eaSTom Tucker rqstp->rq_arg.page_len = 0; 1113260c1d12STom Tucker /* The rq_arg.len includes the transport header bytes */ 11140f0257eaSTom Tucker rqstp->rq_arg.len = dr->argslen<<2; 11150f0257eaSTom Tucker rqstp->rq_prot = dr->prot; 11160f0257eaSTom Tucker memcpy(&rqstp->rq_addr, &dr->addr, dr->addrlen); 11170f0257eaSTom Tucker rqstp->rq_addrlen = dr->addrlen; 1118260c1d12STom Tucker /* Save off transport header len in case we get deferred again */ 1119260c1d12STom Tucker rqstp->rq_xprt_hlen = dr->xprt_hlen; 11200f0257eaSTom Tucker rqstp->rq_daddr = dr->daddr; 11210f0257eaSTom Tucker rqstp->rq_respages = rqstp->rq_pages; 1122260c1d12STom Tucker return (dr->argslen<<2) - dr->xprt_hlen; 11230f0257eaSTom Tucker } 11240f0257eaSTom Tucker 11250f0257eaSTom Tucker 11260f0257eaSTom Tucker static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt) 11270f0257eaSTom Tucker { 11280f0257eaSTom Tucker struct svc_deferred_req *dr = NULL; 11290f0257eaSTom Tucker 11300f0257eaSTom Tucker if (!test_bit(XPT_DEFERRED, &xprt->xpt_flags)) 11310f0257eaSTom Tucker return NULL; 11320f0257eaSTom Tucker spin_lock(&xprt->xpt_lock); 11330f0257eaSTom Tucker if (!list_empty(&xprt->xpt_deferred)) { 11340f0257eaSTom Tucker dr = list_entry(xprt->xpt_deferred.next, 11350f0257eaSTom Tucker struct svc_deferred_req, 11360f0257eaSTom Tucker handle.recent); 11370f0257eaSTom Tucker list_del_init(&dr->handle.recent); 113862bac4afSJ. Bruce Fields } else 113962bac4afSJ. Bruce Fields clear_bit(XPT_DEFERRED, &xprt->xpt_flags); 11400f0257eaSTom Tucker spin_unlock(&xprt->xpt_lock); 11410f0257eaSTom Tucker return dr; 11420f0257eaSTom Tucker } 11437fcb98d5STom Tucker 1144156e6209SChuck Lever /** 1145156e6209SChuck Lever * svc_find_xprt - find an RPC transport instance 1146156e6209SChuck Lever * @serv: pointer to svc_serv to search 1147156e6209SChuck Lever * @xcl_name: C string containing transport's class name 11484cb54ca2SStanislav Kinsbursky * @net: owner net pointer 1149156e6209SChuck Lever * @af: Address family of transport's local address 1150156e6209SChuck Lever * @port: transport's IP port number 1151156e6209SChuck Lever * 11527fcb98d5STom Tucker * Return the transport instance pointer for the endpoint accepting 11537fcb98d5STom Tucker * connections/peer traffic from the specified transport class, 11547fcb98d5STom Tucker * address family and port. 11557fcb98d5STom Tucker * 11567fcb98d5STom Tucker * Specifying 0 for the address family or port is effectively a 11577fcb98d5STom Tucker * wild-card, and will result in matching the first transport in the 11587fcb98d5STom Tucker * service's list that has a matching class name. 11597fcb98d5STom Tucker */ 1160156e6209SChuck Lever struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name, 11614cb54ca2SStanislav Kinsbursky struct net *net, const sa_family_t af, 11624cb54ca2SStanislav Kinsbursky const unsigned short port) 11637fcb98d5STom Tucker { 11647fcb98d5STom Tucker struct svc_xprt *xprt; 11657fcb98d5STom Tucker struct svc_xprt *found = NULL; 11667fcb98d5STom Tucker 11677fcb98d5STom Tucker /* Sanity check the args */ 1168156e6209SChuck Lever if (serv == NULL || xcl_name == NULL) 11697fcb98d5STom Tucker return found; 11707fcb98d5STom Tucker 11717fcb98d5STom Tucker spin_lock_bh(&serv->sv_lock); 11727fcb98d5STom Tucker list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { 11734cb54ca2SStanislav Kinsbursky if (xprt->xpt_net != net) 11744cb54ca2SStanislav Kinsbursky continue; 11757fcb98d5STom Tucker if (strcmp(xprt->xpt_class->xcl_name, xcl_name)) 11767fcb98d5STom Tucker continue; 11777fcb98d5STom Tucker if (af != AF_UNSPEC && af != xprt->xpt_local.ss_family) 11787fcb98d5STom Tucker continue; 1179156e6209SChuck Lever if (port != 0 && port != svc_xprt_local_port(xprt)) 11807fcb98d5STom Tucker continue; 11817fcb98d5STom Tucker found = xprt; 1182a217813fSTom Tucker svc_xprt_get(xprt); 11837fcb98d5STom Tucker break; 11847fcb98d5STom Tucker } 11857fcb98d5STom Tucker spin_unlock_bh(&serv->sv_lock); 11867fcb98d5STom Tucker return found; 11877fcb98d5STom Tucker } 11887fcb98d5STom Tucker EXPORT_SYMBOL_GPL(svc_find_xprt); 11899571af18STom Tucker 1190335c54bdSChuck Lever static int svc_one_xprt_name(const struct svc_xprt *xprt, 1191335c54bdSChuck Lever char *pos, int remaining) 1192335c54bdSChuck Lever { 1193335c54bdSChuck Lever int len; 1194335c54bdSChuck Lever 1195335c54bdSChuck Lever len = snprintf(pos, remaining, "%s %u\n", 1196335c54bdSChuck Lever xprt->xpt_class->xcl_name, 1197335c54bdSChuck Lever svc_xprt_local_port(xprt)); 1198335c54bdSChuck Lever if (len >= remaining) 1199335c54bdSChuck Lever return -ENAMETOOLONG; 1200335c54bdSChuck Lever return len; 1201335c54bdSChuck Lever } 1202335c54bdSChuck Lever 1203335c54bdSChuck Lever /** 1204335c54bdSChuck Lever * svc_xprt_names - format a buffer with a list of transport names 1205335c54bdSChuck Lever * @serv: pointer to an RPC service 1206335c54bdSChuck Lever * @buf: pointer to a buffer to be filled in 1207335c54bdSChuck Lever * @buflen: length of buffer to be filled in 1208335c54bdSChuck Lever * 1209335c54bdSChuck Lever * Fills in @buf with a string containing a list of transport names, 1210335c54bdSChuck Lever * each name terminated with '\n'. 1211335c54bdSChuck Lever * 1212335c54bdSChuck Lever * Returns positive length of the filled-in string on success; otherwise 1213335c54bdSChuck Lever * a negative errno value is returned if an error occurs. 12149571af18STom Tucker */ 1215335c54bdSChuck Lever int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen) 12169571af18STom Tucker { 12179571af18STom Tucker struct svc_xprt *xprt; 1218335c54bdSChuck Lever int len, totlen; 1219335c54bdSChuck Lever char *pos; 12209571af18STom Tucker 12219571af18STom Tucker /* Sanity check args */ 12229571af18STom Tucker if (!serv) 12239571af18STom Tucker return 0; 12249571af18STom Tucker 12259571af18STom Tucker spin_lock_bh(&serv->sv_lock); 1226335c54bdSChuck Lever 1227335c54bdSChuck Lever pos = buf; 1228335c54bdSChuck Lever totlen = 0; 12299571af18STom Tucker list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { 1230335c54bdSChuck Lever len = svc_one_xprt_name(xprt, pos, buflen - totlen); 1231335c54bdSChuck Lever if (len < 0) { 1232335c54bdSChuck Lever *buf = '\0'; 1233335c54bdSChuck Lever totlen = len; 1234335c54bdSChuck Lever } 1235335c54bdSChuck Lever if (len <= 0) 12369571af18STom Tucker break; 1237335c54bdSChuck Lever 1238335c54bdSChuck Lever pos += len; 12399571af18STom Tucker totlen += len; 12409571af18STom Tucker } 1241335c54bdSChuck Lever 12429571af18STom Tucker spin_unlock_bh(&serv->sv_lock); 12439571af18STom Tucker return totlen; 12449571af18STom Tucker } 12459571af18STom Tucker EXPORT_SYMBOL_GPL(svc_xprt_names); 124603cf6c9fSGreg Banks 124703cf6c9fSGreg Banks 124803cf6c9fSGreg Banks /*----------------------------------------------------------------------------*/ 124903cf6c9fSGreg Banks 125003cf6c9fSGreg Banks static void *svc_pool_stats_start(struct seq_file *m, loff_t *pos) 125103cf6c9fSGreg Banks { 125203cf6c9fSGreg Banks unsigned int pidx = (unsigned int)*pos; 125303cf6c9fSGreg Banks struct svc_serv *serv = m->private; 125403cf6c9fSGreg Banks 125503cf6c9fSGreg Banks dprintk("svc_pool_stats_start, *pidx=%u\n", pidx); 125603cf6c9fSGreg Banks 125703cf6c9fSGreg Banks if (!pidx) 125803cf6c9fSGreg Banks return SEQ_START_TOKEN; 125903cf6c9fSGreg Banks return (pidx > serv->sv_nrpools ? NULL : &serv->sv_pools[pidx-1]); 126003cf6c9fSGreg Banks } 126103cf6c9fSGreg Banks 126203cf6c9fSGreg Banks static void *svc_pool_stats_next(struct seq_file *m, void *p, loff_t *pos) 126303cf6c9fSGreg Banks { 126403cf6c9fSGreg Banks struct svc_pool *pool = p; 126503cf6c9fSGreg Banks struct svc_serv *serv = m->private; 126603cf6c9fSGreg Banks 126703cf6c9fSGreg Banks dprintk("svc_pool_stats_next, *pos=%llu\n", *pos); 126803cf6c9fSGreg Banks 126903cf6c9fSGreg Banks if (p == SEQ_START_TOKEN) { 127003cf6c9fSGreg Banks pool = &serv->sv_pools[0]; 127103cf6c9fSGreg Banks } else { 127203cf6c9fSGreg Banks unsigned int pidx = (pool - &serv->sv_pools[0]); 127303cf6c9fSGreg Banks if (pidx < serv->sv_nrpools-1) 127403cf6c9fSGreg Banks pool = &serv->sv_pools[pidx+1]; 127503cf6c9fSGreg Banks else 127603cf6c9fSGreg Banks pool = NULL; 127703cf6c9fSGreg Banks } 127803cf6c9fSGreg Banks ++*pos; 127903cf6c9fSGreg Banks return pool; 128003cf6c9fSGreg Banks } 128103cf6c9fSGreg Banks 128203cf6c9fSGreg Banks static void svc_pool_stats_stop(struct seq_file *m, void *p) 128303cf6c9fSGreg Banks { 128403cf6c9fSGreg Banks } 128503cf6c9fSGreg Banks 128603cf6c9fSGreg Banks static int svc_pool_stats_show(struct seq_file *m, void *p) 128703cf6c9fSGreg Banks { 128803cf6c9fSGreg Banks struct svc_pool *pool = p; 128903cf6c9fSGreg Banks 129003cf6c9fSGreg Banks if (p == SEQ_START_TOKEN) { 129178c210efSJ. Bruce Fields seq_puts(m, "# pool packets-arrived sockets-enqueued threads-woken threads-timedout\n"); 129203cf6c9fSGreg Banks return 0; 129303cf6c9fSGreg Banks } 129403cf6c9fSGreg Banks 129578c210efSJ. Bruce Fields seq_printf(m, "%u %lu %lu %lu %lu\n", 129603cf6c9fSGreg Banks pool->sp_id, 129703cf6c9fSGreg Banks pool->sp_stats.packets, 129803cf6c9fSGreg Banks pool->sp_stats.sockets_queued, 129903cf6c9fSGreg Banks pool->sp_stats.threads_woken, 130003cf6c9fSGreg Banks pool->sp_stats.threads_timedout); 130103cf6c9fSGreg Banks 130203cf6c9fSGreg Banks return 0; 130303cf6c9fSGreg Banks } 130403cf6c9fSGreg Banks 130503cf6c9fSGreg Banks static const struct seq_operations svc_pool_stats_seq_ops = { 130603cf6c9fSGreg Banks .start = svc_pool_stats_start, 130703cf6c9fSGreg Banks .next = svc_pool_stats_next, 130803cf6c9fSGreg Banks .stop = svc_pool_stats_stop, 130903cf6c9fSGreg Banks .show = svc_pool_stats_show, 131003cf6c9fSGreg Banks }; 131103cf6c9fSGreg Banks 131203cf6c9fSGreg Banks int svc_pool_stats_open(struct svc_serv *serv, struct file *file) 131303cf6c9fSGreg Banks { 131403cf6c9fSGreg Banks int err; 131503cf6c9fSGreg Banks 131603cf6c9fSGreg Banks err = seq_open(file, &svc_pool_stats_seq_ops); 131703cf6c9fSGreg Banks if (!err) 131803cf6c9fSGreg Banks ((struct seq_file *) file->private_data)->private = serv; 131903cf6c9fSGreg Banks return err; 132003cf6c9fSGreg Banks } 132103cf6c9fSGreg Banks EXPORT_SYMBOL(svc_pool_stats_open); 132203cf6c9fSGreg Banks 132303cf6c9fSGreg Banks /*----------------------------------------------------------------------------*/ 1324