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> 18860a0d9eSJeff Layton #include <trace/events/sunrpc.h> 191d8206b9STom Tucker 201d8206b9STom Tucker #define RPCDBG_FACILITY RPCDBG_SVCXPRT 211d8206b9STom Tucker 220f0257eaSTom Tucker static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt); 230f0257eaSTom Tucker static int svc_deferred_recv(struct svc_rqst *rqstp); 240f0257eaSTom Tucker static struct cache_deferred_req *svc_defer(struct cache_req *req); 250f0257eaSTom Tucker static void svc_age_temp_xprts(unsigned long closure); 267710ec36SJ. Bruce Fields static void svc_delete_xprt(struct svc_xprt *xprt); 270971374eSTrond Myklebust static void svc_xprt_do_enqueue(struct svc_xprt *xprt); 280f0257eaSTom Tucker 290f0257eaSTom Tucker /* apparently the "standard" is that clients close 300f0257eaSTom Tucker * idle connections after 5 minutes, servers after 310f0257eaSTom Tucker * 6 minutes 320f0257eaSTom Tucker * http://www.connectathon.org/talks96/nfstcp.pdf 330f0257eaSTom Tucker */ 340f0257eaSTom Tucker static int svc_conn_age_period = 6*60; 350f0257eaSTom Tucker 361d8206b9STom Tucker /* List of registered transport classes */ 371d8206b9STom Tucker static DEFINE_SPINLOCK(svc_xprt_class_lock); 381d8206b9STom Tucker static LIST_HEAD(svc_xprt_class_list); 391d8206b9STom Tucker 400f0257eaSTom Tucker /* SMP locking strategy: 410f0257eaSTom Tucker * 420f0257eaSTom Tucker * svc_pool->sp_lock protects most of the fields of that pool. 430f0257eaSTom Tucker * svc_serv->sv_lock protects sv_tempsocks, sv_permsocks, sv_tmpcnt. 440f0257eaSTom Tucker * when both need to be taken (rare), svc_serv->sv_lock is first. 450f0257eaSTom Tucker * BKL protects svc_serv->sv_nrthread. 460f0257eaSTom Tucker * svc_sock->sk_lock protects the svc_sock->sk_deferred list 470f0257eaSTom Tucker * and the ->sk_info_authunix cache. 480f0257eaSTom Tucker * 490f0257eaSTom Tucker * The XPT_BUSY bit in xprt->xpt_flags prevents a transport being 500f0257eaSTom Tucker * enqueued multiply. During normal transport processing this bit 510f0257eaSTom Tucker * is set by svc_xprt_enqueue and cleared by svc_xprt_received. 520f0257eaSTom Tucker * Providers should not manipulate this bit directly. 530f0257eaSTom Tucker * 540f0257eaSTom Tucker * Some flags can be set to certain values at any time 550f0257eaSTom Tucker * providing that certain rules are followed: 560f0257eaSTom Tucker * 570f0257eaSTom Tucker * XPT_CONN, XPT_DATA: 580f0257eaSTom Tucker * - Can be set or cleared at any time. 590f0257eaSTom Tucker * - After a set, svc_xprt_enqueue must be called to enqueue 600f0257eaSTom Tucker * the transport for processing. 610f0257eaSTom Tucker * - After a clear, the transport must be read/accepted. 620f0257eaSTom Tucker * If this succeeds, it must be set again. 630f0257eaSTom Tucker * XPT_CLOSE: 640f0257eaSTom Tucker * - Can set at any time. It is never cleared. 650f0257eaSTom Tucker * XPT_DEAD: 660f0257eaSTom Tucker * - Can only be set while XPT_BUSY is held which ensures 670f0257eaSTom Tucker * that no other thread will be using the transport or will 680f0257eaSTom Tucker * try to set XPT_DEAD. 690f0257eaSTom Tucker */ 700f0257eaSTom Tucker 711d8206b9STom Tucker int svc_reg_xprt_class(struct svc_xprt_class *xcl) 721d8206b9STom Tucker { 731d8206b9STom Tucker struct svc_xprt_class *cl; 741d8206b9STom Tucker int res = -EEXIST; 751d8206b9STom Tucker 761d8206b9STom Tucker dprintk("svc: Adding svc transport class '%s'\n", xcl->xcl_name); 771d8206b9STom Tucker 781d8206b9STom Tucker INIT_LIST_HEAD(&xcl->xcl_list); 791d8206b9STom Tucker spin_lock(&svc_xprt_class_lock); 801d8206b9STom Tucker /* Make sure there isn't already a class with the same name */ 811d8206b9STom Tucker list_for_each_entry(cl, &svc_xprt_class_list, xcl_list) { 821d8206b9STom Tucker if (strcmp(xcl->xcl_name, cl->xcl_name) == 0) 831d8206b9STom Tucker goto out; 841d8206b9STom Tucker } 851d8206b9STom Tucker list_add_tail(&xcl->xcl_list, &svc_xprt_class_list); 861d8206b9STom Tucker res = 0; 871d8206b9STom Tucker out: 881d8206b9STom Tucker spin_unlock(&svc_xprt_class_lock); 891d8206b9STom Tucker return res; 901d8206b9STom Tucker } 911d8206b9STom Tucker EXPORT_SYMBOL_GPL(svc_reg_xprt_class); 921d8206b9STom Tucker 931d8206b9STom Tucker void svc_unreg_xprt_class(struct svc_xprt_class *xcl) 941d8206b9STom Tucker { 951d8206b9STom Tucker dprintk("svc: Removing svc transport class '%s'\n", xcl->xcl_name); 961d8206b9STom Tucker spin_lock(&svc_xprt_class_lock); 971d8206b9STom Tucker list_del_init(&xcl->xcl_list); 981d8206b9STom Tucker spin_unlock(&svc_xprt_class_lock); 991d8206b9STom Tucker } 1001d8206b9STom Tucker EXPORT_SYMBOL_GPL(svc_unreg_xprt_class); 1011d8206b9STom Tucker 102dc9a16e4STom Tucker /* 103dc9a16e4STom Tucker * Format the transport list for printing 104dc9a16e4STom Tucker */ 105dc9a16e4STom Tucker int svc_print_xprts(char *buf, int maxlen) 106dc9a16e4STom Tucker { 1078f3a6de3SPavel Emelyanov struct svc_xprt_class *xcl; 108dc9a16e4STom Tucker char tmpstr[80]; 109dc9a16e4STom Tucker int len = 0; 110dc9a16e4STom Tucker buf[0] = '\0'; 111dc9a16e4STom Tucker 112dc9a16e4STom Tucker spin_lock(&svc_xprt_class_lock); 1138f3a6de3SPavel Emelyanov list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) { 114dc9a16e4STom Tucker int slen; 115dc9a16e4STom Tucker 116dc9a16e4STom Tucker sprintf(tmpstr, "%s %d\n", xcl->xcl_name, xcl->xcl_max_payload); 117dc9a16e4STom Tucker slen = strlen(tmpstr); 118dc9a16e4STom Tucker if (len + slen > maxlen) 119dc9a16e4STom Tucker break; 120dc9a16e4STom Tucker len += slen; 121dc9a16e4STom Tucker strcat(buf, tmpstr); 122dc9a16e4STom Tucker } 123dc9a16e4STom Tucker spin_unlock(&svc_xprt_class_lock); 124dc9a16e4STom Tucker 125dc9a16e4STom Tucker return len; 126dc9a16e4STom Tucker } 127dc9a16e4STom Tucker 128e1b3157fSTom Tucker static void svc_xprt_free(struct kref *kref) 129e1b3157fSTom Tucker { 130e1b3157fSTom Tucker struct svc_xprt *xprt = 131e1b3157fSTom Tucker container_of(kref, struct svc_xprt, xpt_ref); 132e1b3157fSTom Tucker struct module *owner = xprt->xpt_class->xcl_owner; 133e3bfca01SPavel Emelyanov if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) 134e3bfca01SPavel Emelyanov svcauth_unix_info_release(xprt); 1354fb8518bSPavel Emelyanov put_net(xprt->xpt_net); 13699de8ea9SJ. Bruce Fields /* See comment on corresponding get in xs_setup_bc_tcp(): */ 13799de8ea9SJ. Bruce Fields if (xprt->xpt_bc_xprt) 13899de8ea9SJ. Bruce Fields xprt_put(xprt->xpt_bc_xprt); 139e1b3157fSTom Tucker xprt->xpt_ops->xpo_free(xprt); 140e1b3157fSTom Tucker module_put(owner); 141e1b3157fSTom Tucker } 142e1b3157fSTom Tucker 143e1b3157fSTom Tucker void svc_xprt_put(struct svc_xprt *xprt) 144e1b3157fSTom Tucker { 145e1b3157fSTom Tucker kref_put(&xprt->xpt_ref, svc_xprt_free); 146e1b3157fSTom Tucker } 147e1b3157fSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_put); 148e1b3157fSTom Tucker 1491d8206b9STom Tucker /* 1501d8206b9STom Tucker * Called by transport drivers to initialize the transport independent 1511d8206b9STom Tucker * portion of the transport instance. 1521d8206b9STom Tucker */ 153bd4620ddSStanislav Kinsbursky void svc_xprt_init(struct net *net, struct svc_xprt_class *xcl, 154bd4620ddSStanislav Kinsbursky struct svc_xprt *xprt, struct svc_serv *serv) 1551d8206b9STom Tucker { 1561d8206b9STom Tucker memset(xprt, 0, sizeof(*xprt)); 1571d8206b9STom Tucker xprt->xpt_class = xcl; 1581d8206b9STom Tucker xprt->xpt_ops = xcl->xcl_ops; 159e1b3157fSTom Tucker kref_init(&xprt->xpt_ref); 160bb5cf160STom Tucker xprt->xpt_server = serv; 1617a182083STom Tucker INIT_LIST_HEAD(&xprt->xpt_list); 1627a182083STom Tucker INIT_LIST_HEAD(&xprt->xpt_ready); 1638c7b0172STom Tucker INIT_LIST_HEAD(&xprt->xpt_deferred); 164edc7a894SJ. Bruce Fields INIT_LIST_HEAD(&xprt->xpt_users); 165a50fea26STom Tucker mutex_init(&xprt->xpt_mutex); 166def13d74STom Tucker spin_lock_init(&xprt->xpt_lock); 1674e5caaa5STom Tucker set_bit(XPT_BUSY, &xprt->xpt_flags); 1684cfc7e60SRahul Iyer rpc_init_wait_queue(&xprt->xpt_bc_pending, "xpt_bc_pending"); 169bd4620ddSStanislav Kinsbursky xprt->xpt_net = get_net(net); 1701d8206b9STom Tucker } 1711d8206b9STom Tucker EXPORT_SYMBOL_GPL(svc_xprt_init); 172b700cbb1STom Tucker 1735dd248f6SChuck Lever static struct svc_xprt *__svc_xpo_create(struct svc_xprt_class *xcl, 1745dd248f6SChuck Lever struct svc_serv *serv, 17562832c03SPavel Emelyanov struct net *net, 1769652ada3SChuck Lever const int family, 1779652ada3SChuck Lever const unsigned short port, 1789652ada3SChuck Lever int flags) 179b700cbb1STom Tucker { 180b700cbb1STom Tucker struct sockaddr_in sin = { 181b700cbb1STom Tucker .sin_family = AF_INET, 182e6f1cebfSAl Viro .sin_addr.s_addr = htonl(INADDR_ANY), 183b700cbb1STom Tucker .sin_port = htons(port), 184b700cbb1STom Tucker }; 185dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 1865dd248f6SChuck Lever struct sockaddr_in6 sin6 = { 1875dd248f6SChuck Lever .sin6_family = AF_INET6, 1885dd248f6SChuck Lever .sin6_addr = IN6ADDR_ANY_INIT, 1895dd248f6SChuck Lever .sin6_port = htons(port), 1905dd248f6SChuck Lever }; 191dfd56b8bSEric Dumazet #endif 1925dd248f6SChuck Lever struct sockaddr *sap; 1935dd248f6SChuck Lever size_t len; 1945dd248f6SChuck Lever 1959652ada3SChuck Lever switch (family) { 1969652ada3SChuck Lever case PF_INET: 1975dd248f6SChuck Lever sap = (struct sockaddr *)&sin; 1985dd248f6SChuck Lever len = sizeof(sin); 1995dd248f6SChuck Lever break; 200dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 2019652ada3SChuck Lever case PF_INET6: 2025dd248f6SChuck Lever sap = (struct sockaddr *)&sin6; 2035dd248f6SChuck Lever len = sizeof(sin6); 2045dd248f6SChuck Lever break; 205dfd56b8bSEric Dumazet #endif 2065dd248f6SChuck Lever default: 2075dd248f6SChuck Lever return ERR_PTR(-EAFNOSUPPORT); 2085dd248f6SChuck Lever } 2095dd248f6SChuck Lever 21062832c03SPavel Emelyanov return xcl->xcl_ops->xpo_create(serv, net, sap, len, flags); 2115dd248f6SChuck Lever } 2125dd248f6SChuck Lever 2136741019cSJ. Bruce Fields /* 2146741019cSJ. Bruce Fields * svc_xprt_received conditionally queues the transport for processing 2156741019cSJ. Bruce Fields * by another thread. The caller must hold the XPT_BUSY bit and must 2166741019cSJ. Bruce Fields * not thereafter touch transport data. 2176741019cSJ. Bruce Fields * 2186741019cSJ. Bruce Fields * Note: XPT_DATA only gets cleared when a read-attempt finds no (or 2196741019cSJ. Bruce Fields * insufficient) data. 2206741019cSJ. Bruce Fields */ 2216741019cSJ. Bruce Fields static void svc_xprt_received(struct svc_xprt *xprt) 2226741019cSJ. Bruce Fields { 223ff1fdb9bSWeston Andros Adamson WARN_ON_ONCE(!test_bit(XPT_BUSY, &xprt->xpt_flags)); 224ff1fdb9bSWeston Andros Adamson if (!test_bit(XPT_BUSY, &xprt->xpt_flags)) 225ff1fdb9bSWeston Andros Adamson return; 2266741019cSJ. Bruce Fields /* As soon as we clear busy, the xprt could be closed and 2270971374eSTrond Myklebust * 'put', so we need a reference to call svc_xprt_do_enqueue with: 2286741019cSJ. Bruce Fields */ 2296741019cSJ. Bruce Fields svc_xprt_get(xprt); 2300971374eSTrond Myklebust smp_mb__before_atomic(); 2316741019cSJ. Bruce Fields clear_bit(XPT_BUSY, &xprt->xpt_flags); 2320971374eSTrond Myklebust svc_xprt_do_enqueue(xprt); 2336741019cSJ. Bruce Fields svc_xprt_put(xprt); 2346741019cSJ. Bruce Fields } 2356741019cSJ. Bruce Fields 23639b55301SJ. Bruce Fields void svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *new) 23739b55301SJ. Bruce Fields { 23839b55301SJ. Bruce Fields clear_bit(XPT_TEMP, &new->xpt_flags); 23939b55301SJ. Bruce Fields spin_lock_bh(&serv->sv_lock); 24039b55301SJ. Bruce Fields list_add(&new->xpt_list, &serv->sv_permsocks); 24139b55301SJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 24239b55301SJ. Bruce Fields svc_xprt_received(new); 24339b55301SJ. Bruce Fields } 24439b55301SJ. Bruce Fields 2459652ada3SChuck Lever int svc_create_xprt(struct svc_serv *serv, const char *xprt_name, 246fc5d00b0SPavel Emelyanov struct net *net, const int family, 247fc5d00b0SPavel Emelyanov const unsigned short port, int flags) 2485dd248f6SChuck Lever { 2495dd248f6SChuck Lever struct svc_xprt_class *xcl; 2505dd248f6SChuck Lever 251b700cbb1STom Tucker dprintk("svc: creating transport %s[%d]\n", xprt_name, port); 252b700cbb1STom Tucker spin_lock(&svc_xprt_class_lock); 253b700cbb1STom Tucker list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) { 254b700cbb1STom Tucker struct svc_xprt *newxprt; 255ed2849d3SNeilBrown unsigned short newport; 2564e5caaa5STom Tucker 2574e5caaa5STom Tucker if (strcmp(xprt_name, xcl->xcl_name)) 2584e5caaa5STom Tucker continue; 2594e5caaa5STom Tucker 2604e5caaa5STom Tucker if (!try_module_get(xcl->xcl_owner)) 2614e5caaa5STom Tucker goto err; 2624e5caaa5STom Tucker 2634e5caaa5STom Tucker spin_unlock(&svc_xprt_class_lock); 26462832c03SPavel Emelyanov newxprt = __svc_xpo_create(xcl, serv, net, family, port, flags); 265b700cbb1STom Tucker if (IS_ERR(newxprt)) { 266b700cbb1STom Tucker module_put(xcl->xcl_owner); 2674e5caaa5STom Tucker return PTR_ERR(newxprt); 268b700cbb1STom Tucker } 26939b55301SJ. Bruce Fields svc_add_new_perm_xprt(serv, newxprt); 270ed2849d3SNeilBrown newport = svc_xprt_local_port(newxprt); 271ed2849d3SNeilBrown return newport; 272b700cbb1STom Tucker } 2734e5caaa5STom Tucker err: 274b700cbb1STom Tucker spin_unlock(&svc_xprt_class_lock); 275b700cbb1STom Tucker dprintk("svc: transport %s not found\n", xprt_name); 27668717908SChuck Lever 27768717908SChuck Lever /* This errno is exposed to user space. Provide a reasonable 27868717908SChuck Lever * perror msg for a bad transport. */ 27968717908SChuck Lever return -EPROTONOSUPPORT; 280b700cbb1STom Tucker } 281b700cbb1STom Tucker EXPORT_SYMBOL_GPL(svc_create_xprt); 2829dbc240fSTom Tucker 2839dbc240fSTom Tucker /* 2849dbc240fSTom Tucker * Copy the local and remote xprt addresses to the rqstp structure 2859dbc240fSTom Tucker */ 2869dbc240fSTom Tucker void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt) 2879dbc240fSTom Tucker { 2889dbc240fSTom Tucker memcpy(&rqstp->rq_addr, &xprt->xpt_remote, xprt->xpt_remotelen); 2899dbc240fSTom Tucker rqstp->rq_addrlen = xprt->xpt_remotelen; 2909dbc240fSTom Tucker 2919dbc240fSTom Tucker /* 2929dbc240fSTom Tucker * Destination address in request is needed for binding the 2939dbc240fSTom Tucker * source address in RPC replies/callbacks later. 2949dbc240fSTom Tucker */ 295849a1cf1SMi Jinlong memcpy(&rqstp->rq_daddr, &xprt->xpt_local, xprt->xpt_locallen); 296849a1cf1SMi Jinlong rqstp->rq_daddrlen = xprt->xpt_locallen; 2979dbc240fSTom Tucker } 2989dbc240fSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs); 2999dbc240fSTom Tucker 3000f0257eaSTom Tucker /** 3010f0257eaSTom Tucker * svc_print_addr - Format rq_addr field for printing 3020f0257eaSTom Tucker * @rqstp: svc_rqst struct containing address to print 3030f0257eaSTom Tucker * @buf: target buffer for formatted address 3040f0257eaSTom Tucker * @len: length of target buffer 3050f0257eaSTom Tucker * 3060f0257eaSTom Tucker */ 3070f0257eaSTom Tucker char *svc_print_addr(struct svc_rqst *rqstp, char *buf, size_t len) 3080f0257eaSTom Tucker { 3090f0257eaSTom Tucker return __svc_print_addr(svc_addr(rqstp), buf, len); 3100f0257eaSTom Tucker } 3110f0257eaSTom Tucker EXPORT_SYMBOL_GPL(svc_print_addr); 3120f0257eaSTom Tucker 3130f0257eaSTom Tucker /* 3140f0257eaSTom Tucker * Queue up an idle server thread. Must have pool->sp_lock held. 3150f0257eaSTom Tucker * Note: this is really a stack rather than a queue, so that we only 3160f0257eaSTom Tucker * use as many different threads as we need, and the rest don't pollute 3170f0257eaSTom Tucker * the cache. 3180f0257eaSTom Tucker */ 3190f0257eaSTom Tucker static void svc_thread_enqueue(struct svc_pool *pool, struct svc_rqst *rqstp) 3200f0257eaSTom Tucker { 3210f0257eaSTom Tucker list_add(&rqstp->rq_list, &pool->sp_threads); 3220f0257eaSTom Tucker } 3230f0257eaSTom Tucker 3240f0257eaSTom Tucker /* 3250f0257eaSTom Tucker * Dequeue an nfsd thread. Must have pool->sp_lock held. 3260f0257eaSTom Tucker */ 3270f0257eaSTom Tucker static void svc_thread_dequeue(struct svc_pool *pool, struct svc_rqst *rqstp) 3280f0257eaSTom Tucker { 3290f0257eaSTom Tucker list_del(&rqstp->rq_list); 3300f0257eaSTom Tucker } 3310f0257eaSTom Tucker 3329c335c0bSJ. Bruce Fields static bool svc_xprt_has_something_to_do(struct svc_xprt *xprt) 3339c335c0bSJ. Bruce Fields { 3349c335c0bSJ. Bruce Fields if (xprt->xpt_flags & ((1<<XPT_CONN)|(1<<XPT_CLOSE))) 3359c335c0bSJ. Bruce Fields return true; 3369c335c0bSJ. Bruce Fields if (xprt->xpt_flags & ((1<<XPT_DATA)|(1<<XPT_DEFERRED))) 3379c335c0bSJ. Bruce Fields return xprt->xpt_ops->xpo_has_wspace(xprt); 3389c335c0bSJ. Bruce Fields return false; 3399c335c0bSJ. Bruce Fields } 3409c335c0bSJ. Bruce Fields 3410971374eSTrond Myklebust static void svc_xprt_do_enqueue(struct svc_xprt *xprt) 3420f0257eaSTom Tucker { 3430f0257eaSTom Tucker struct svc_pool *pool; 3440f0257eaSTom Tucker struct svc_rqst *rqstp; 3450f0257eaSTom Tucker int cpu; 3460f0257eaSTom Tucker 3479c335c0bSJ. Bruce Fields if (!svc_xprt_has_something_to_do(xprt)) 3480f0257eaSTom Tucker return; 3490f0257eaSTom Tucker 3500f0257eaSTom Tucker /* Mark transport as busy. It will remain in this state until 3510f0257eaSTom Tucker * the provider calls svc_xprt_received. We update XPT_BUSY 3520f0257eaSTom Tucker * atomically because it also guards against trying to enqueue 3530f0257eaSTom Tucker * the transport twice. 3540f0257eaSTom Tucker */ 3550f0257eaSTom Tucker if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) { 3560f0257eaSTom Tucker /* Don't enqueue transport while already enqueued */ 3570f0257eaSTom Tucker dprintk("svc: transport %p busy, not enqueued\n", xprt); 3580c0746d0STrond Myklebust return; 3590f0257eaSTom Tucker } 3600f0257eaSTom Tucker 3610c0746d0STrond Myklebust cpu = get_cpu(); 3620c0746d0STrond Myklebust pool = svc_pool_for_cpu(xprt->xpt_server, cpu); 3630c0746d0STrond Myklebust spin_lock_bh(&pool->sp_lock); 3640c0746d0STrond Myklebust 3650c0746d0STrond Myklebust pool->sp_stats.packets++; 3660c0746d0STrond Myklebust 36778c210efSJ. Bruce Fields if (!list_empty(&pool->sp_threads)) { 3680f0257eaSTom Tucker rqstp = list_entry(pool->sp_threads.next, 3690f0257eaSTom Tucker struct svc_rqst, 3700f0257eaSTom Tucker rq_list); 3710f0257eaSTom Tucker dprintk("svc: transport %p served by daemon %p\n", 3720f0257eaSTom Tucker xprt, rqstp); 3730f0257eaSTom Tucker svc_thread_dequeue(pool, rqstp); 3740f0257eaSTom Tucker if (rqstp->rq_xprt) 3750f0257eaSTom Tucker printk(KERN_ERR 3760f0257eaSTom Tucker "svc_xprt_enqueue: server %p, rq_xprt=%p!\n", 3770f0257eaSTom Tucker rqstp, rqstp->rq_xprt); 378983c6844STrond Myklebust /* Note the order of the following 3 lines: 379983c6844STrond Myklebust * We want to assign xprt to rqstp->rq_xprt only _after_ 380983c6844STrond Myklebust * we've woken up the process, so that we don't race with 381983c6844STrond Myklebust * the lockless check in svc_get_next_xprt(). 382983c6844STrond Myklebust */ 3830f0257eaSTom Tucker svc_xprt_get(xprt); 384983c6844STrond Myklebust wake_up_process(rqstp->rq_task); 385983c6844STrond Myklebust rqstp->rq_xprt = xprt; 38603cf6c9fSGreg Banks pool->sp_stats.threads_woken++; 3870f0257eaSTom Tucker } else { 3880f0257eaSTom Tucker dprintk("svc: transport %p put into queue\n", xprt); 3890f0257eaSTom Tucker list_add_tail(&xprt->xpt_ready, &pool->sp_sockets); 39003cf6c9fSGreg Banks pool->sp_stats.sockets_queued++; 3910f0257eaSTom Tucker } 3920f0257eaSTom Tucker 3930f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 394983c6844STrond Myklebust put_cpu(); 3950f0257eaSTom Tucker } 3960971374eSTrond Myklebust 3970971374eSTrond Myklebust /* 3980971374eSTrond Myklebust * Queue up a transport with data pending. If there are idle nfsd 3990971374eSTrond Myklebust * processes, wake 'em up. 4000971374eSTrond Myklebust * 4010971374eSTrond Myklebust */ 4020971374eSTrond Myklebust void svc_xprt_enqueue(struct svc_xprt *xprt) 4030971374eSTrond Myklebust { 4040971374eSTrond Myklebust if (test_bit(XPT_BUSY, &xprt->xpt_flags)) 4050971374eSTrond Myklebust return; 4060971374eSTrond Myklebust svc_xprt_do_enqueue(xprt); 4070971374eSTrond Myklebust } 4080f0257eaSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_enqueue); 4090f0257eaSTom Tucker 4100f0257eaSTom Tucker /* 4110f0257eaSTom Tucker * Dequeue the first transport. Must be called with the pool->sp_lock held. 4120f0257eaSTom Tucker */ 4130f0257eaSTom Tucker static struct svc_xprt *svc_xprt_dequeue(struct svc_pool *pool) 4140f0257eaSTom Tucker { 4150f0257eaSTom Tucker struct svc_xprt *xprt; 4160f0257eaSTom Tucker 4170f0257eaSTom Tucker if (list_empty(&pool->sp_sockets)) 4180f0257eaSTom Tucker return NULL; 4190f0257eaSTom Tucker 4200f0257eaSTom Tucker xprt = list_entry(pool->sp_sockets.next, 4210f0257eaSTom Tucker struct svc_xprt, xpt_ready); 4220f0257eaSTom Tucker list_del_init(&xprt->xpt_ready); 4230f0257eaSTom Tucker 4240f0257eaSTom Tucker dprintk("svc: transport %p dequeued, inuse=%d\n", 4250f0257eaSTom Tucker xprt, atomic_read(&xprt->xpt_ref.refcount)); 4260f0257eaSTom Tucker 4270f0257eaSTom Tucker return xprt; 4280f0257eaSTom Tucker } 4290f0257eaSTom Tucker 4300f0257eaSTom Tucker /** 4310f0257eaSTom Tucker * svc_reserve - change the space reserved for the reply to a request. 4320f0257eaSTom Tucker * @rqstp: The request in question 4330f0257eaSTom Tucker * @space: new max space to reserve 4340f0257eaSTom Tucker * 4350f0257eaSTom Tucker * Each request reserves some space on the output queue of the transport 4360f0257eaSTom Tucker * to make sure the reply fits. This function reduces that reserved 4370f0257eaSTom Tucker * space to be the amount of space used already, plus @space. 4380f0257eaSTom Tucker * 4390f0257eaSTom Tucker */ 4400f0257eaSTom Tucker void svc_reserve(struct svc_rqst *rqstp, int space) 4410f0257eaSTom Tucker { 4420f0257eaSTom Tucker space += rqstp->rq_res.head[0].iov_len; 4430f0257eaSTom Tucker 4440f0257eaSTom Tucker if (space < rqstp->rq_reserved) { 4450f0257eaSTom Tucker struct svc_xprt *xprt = rqstp->rq_xprt; 4460f0257eaSTom Tucker atomic_sub((rqstp->rq_reserved - space), &xprt->xpt_reserved); 4470f0257eaSTom Tucker rqstp->rq_reserved = space; 4480f0257eaSTom Tucker 44951877680STrond Myklebust if (xprt->xpt_ops->xpo_adjust_wspace) 45051877680STrond Myklebust xprt->xpt_ops->xpo_adjust_wspace(xprt); 4510f0257eaSTom Tucker svc_xprt_enqueue(xprt); 4520f0257eaSTom Tucker } 4530f0257eaSTom Tucker } 45424c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_reserve); 4550f0257eaSTom Tucker 4560f0257eaSTom Tucker static void svc_xprt_release(struct svc_rqst *rqstp) 4570f0257eaSTom Tucker { 4580f0257eaSTom Tucker struct svc_xprt *xprt = rqstp->rq_xprt; 4590f0257eaSTom Tucker 4600f0257eaSTom Tucker rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); 4610f0257eaSTom Tucker 4622779e3aeSTom Tucker kfree(rqstp->rq_deferred); 4632779e3aeSTom Tucker rqstp->rq_deferred = NULL; 4642779e3aeSTom Tucker 4650f0257eaSTom Tucker svc_free_res_pages(rqstp); 4660f0257eaSTom Tucker rqstp->rq_res.page_len = 0; 4670f0257eaSTom Tucker rqstp->rq_res.page_base = 0; 4680f0257eaSTom Tucker 4690f0257eaSTom Tucker /* Reset response buffer and release 4700f0257eaSTom Tucker * the reservation. 4710f0257eaSTom Tucker * But first, check that enough space was reserved 4720f0257eaSTom Tucker * for the reply, otherwise we have a bug! 4730f0257eaSTom Tucker */ 4740f0257eaSTom Tucker if ((rqstp->rq_res.len) > rqstp->rq_reserved) 4750f0257eaSTom Tucker printk(KERN_ERR "RPC request reserved %d but used %d\n", 4760f0257eaSTom Tucker rqstp->rq_reserved, 4770f0257eaSTom Tucker rqstp->rq_res.len); 4780f0257eaSTom Tucker 4790f0257eaSTom Tucker rqstp->rq_res.head[0].iov_len = 0; 4800f0257eaSTom Tucker svc_reserve(rqstp, 0); 4810f0257eaSTom Tucker rqstp->rq_xprt = NULL; 4820f0257eaSTom Tucker 4830f0257eaSTom Tucker svc_xprt_put(xprt); 4840f0257eaSTom Tucker } 4850f0257eaSTom Tucker 4860f0257eaSTom Tucker /* 4870f0257eaSTom Tucker * External function to wake up a server waiting for data 4880f0257eaSTom Tucker * This really only makes sense for services like lockd 4890f0257eaSTom Tucker * which have exactly one thread anyway. 4900f0257eaSTom Tucker */ 4910f0257eaSTom Tucker void svc_wake_up(struct svc_serv *serv) 4920f0257eaSTom Tucker { 4930f0257eaSTom Tucker struct svc_rqst *rqstp; 4940f0257eaSTom Tucker unsigned int i; 4950f0257eaSTom Tucker struct svc_pool *pool; 4960f0257eaSTom Tucker 4970f0257eaSTom Tucker for (i = 0; i < serv->sv_nrpools; i++) { 4980f0257eaSTom Tucker pool = &serv->sv_pools[i]; 4990f0257eaSTom Tucker 5000f0257eaSTom Tucker spin_lock_bh(&pool->sp_lock); 5010f0257eaSTom Tucker if (!list_empty(&pool->sp_threads)) { 5020f0257eaSTom Tucker rqstp = list_entry(pool->sp_threads.next, 5030f0257eaSTom Tucker struct svc_rqst, 5040f0257eaSTom Tucker rq_list); 5050f0257eaSTom Tucker dprintk("svc: daemon %p woken up.\n", rqstp); 5060f0257eaSTom Tucker /* 5070f0257eaSTom Tucker svc_thread_dequeue(pool, rqstp); 5080f0257eaSTom Tucker rqstp->rq_xprt = NULL; 5090f0257eaSTom Tucker */ 510983c6844STrond Myklebust wake_up_process(rqstp->rq_task); 51135525b79SAndriy Skulysh } else 51235525b79SAndriy Skulysh pool->sp_task_pending = 1; 5130f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 5140f0257eaSTom Tucker } 5150f0257eaSTom Tucker } 51624c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_wake_up); 5170f0257eaSTom Tucker 5180f0257eaSTom Tucker int svc_port_is_privileged(struct sockaddr *sin) 5190f0257eaSTom Tucker { 5200f0257eaSTom Tucker switch (sin->sa_family) { 5210f0257eaSTom Tucker case AF_INET: 5220f0257eaSTom Tucker return ntohs(((struct sockaddr_in *)sin)->sin_port) 5230f0257eaSTom Tucker < PROT_SOCK; 5240f0257eaSTom Tucker case AF_INET6: 5250f0257eaSTom Tucker return ntohs(((struct sockaddr_in6 *)sin)->sin6_port) 5260f0257eaSTom Tucker < PROT_SOCK; 5270f0257eaSTom Tucker default: 5280f0257eaSTom Tucker return 0; 5290f0257eaSTom Tucker } 5300f0257eaSTom Tucker } 5310f0257eaSTom Tucker 5320f0257eaSTom Tucker /* 533c9233eb7SJeff Layton * Make sure that we don't have too many active connections. If we have, 534c9233eb7SJeff Layton * something must be dropped. It's not clear what will happen if we allow 535c9233eb7SJeff Layton * "too many" connections, but when dealing with network-facing software, 536c9233eb7SJeff Layton * we have to code defensively. Here we do that by imposing hard limits. 5370f0257eaSTom Tucker * 5380f0257eaSTom Tucker * There's no point in trying to do random drop here for DoS 5390f0257eaSTom Tucker * prevention. The NFS clients does 1 reconnect in 15 seconds. An 5400f0257eaSTom Tucker * attacker can easily beat that. 5410f0257eaSTom Tucker * 5420f0257eaSTom Tucker * The only somewhat efficient mechanism would be if drop old 5430f0257eaSTom Tucker * connections from the same IP first. But right now we don't even 5440f0257eaSTom Tucker * record the client IP in svc_sock. 545c9233eb7SJeff Layton * 546c9233eb7SJeff Layton * single-threaded services that expect a lot of clients will probably 547c9233eb7SJeff Layton * need to set sv_maxconn to override the default value which is based 548c9233eb7SJeff Layton * on the number of threads 5490f0257eaSTom Tucker */ 5500f0257eaSTom Tucker static void svc_check_conn_limits(struct svc_serv *serv) 5510f0257eaSTom Tucker { 552c9233eb7SJeff Layton unsigned int limit = serv->sv_maxconn ? serv->sv_maxconn : 553c9233eb7SJeff Layton (serv->sv_nrthreads+3) * 20; 554c9233eb7SJeff Layton 555c9233eb7SJeff Layton if (serv->sv_tmpcnt > limit) { 5560f0257eaSTom Tucker struct svc_xprt *xprt = NULL; 5570f0257eaSTom Tucker spin_lock_bh(&serv->sv_lock); 5580f0257eaSTom Tucker if (!list_empty(&serv->sv_tempsocks)) { 5590f0257eaSTom Tucker /* Try to help the admin */ 560e87cc472SJoe Perches net_notice_ratelimited("%s: too many open connections, consider increasing the %s\n", 561c9233eb7SJeff Layton serv->sv_name, serv->sv_maxconn ? 562e87cc472SJoe Perches "max number of connections" : 563e87cc472SJoe Perches "number of threads"); 5640f0257eaSTom Tucker /* 5650f0257eaSTom Tucker * Always select the oldest connection. It's not fair, 5660f0257eaSTom Tucker * but so is life 5670f0257eaSTom Tucker */ 5680f0257eaSTom Tucker xprt = list_entry(serv->sv_tempsocks.prev, 5690f0257eaSTom Tucker struct svc_xprt, 5700f0257eaSTom Tucker xpt_list); 5710f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 5720f0257eaSTom Tucker svc_xprt_get(xprt); 5730f0257eaSTom Tucker } 5740f0257eaSTom Tucker spin_unlock_bh(&serv->sv_lock); 5750f0257eaSTom Tucker 5760f0257eaSTom Tucker if (xprt) { 5770f0257eaSTom Tucker svc_xprt_enqueue(xprt); 5780f0257eaSTom Tucker svc_xprt_put(xprt); 5790f0257eaSTom Tucker } 5800f0257eaSTom Tucker } 5810f0257eaSTom Tucker } 5820f0257eaSTom Tucker 583e1d83ee6SRashika Kheria static int svc_alloc_arg(struct svc_rqst *rqstp) 5840f0257eaSTom Tucker { 5850f0257eaSTom Tucker struct svc_serv *serv = rqstp->rq_server; 5860f0257eaSTom Tucker struct xdr_buf *arg; 5876797fa5aSJ. Bruce Fields int pages; 5886797fa5aSJ. Bruce Fields int i; 5890f0257eaSTom Tucker 5900f0257eaSTom Tucker /* now allocate needed pages. If we get a failure, sleep briefly */ 5910f0257eaSTom Tucker pages = (serv->sv_max_mesg + PAGE_SIZE) / PAGE_SIZE; 592b25cd058SWeston Andros Adamson WARN_ON_ONCE(pages >= RPCSVC_MAXPAGES); 593b25cd058SWeston Andros Adamson if (pages >= RPCSVC_MAXPAGES) 594b25cd058SWeston Andros Adamson /* use as many pages as possible */ 595b25cd058SWeston Andros Adamson pages = RPCSVC_MAXPAGES - 1; 5960f0257eaSTom Tucker for (i = 0; i < pages ; i++) 5970f0257eaSTom Tucker while (rqstp->rq_pages[i] == NULL) { 5980f0257eaSTom Tucker struct page *p = alloc_page(GFP_KERNEL); 5990f0257eaSTom Tucker if (!p) { 6007b54fe61SJeff Layton set_current_state(TASK_INTERRUPTIBLE); 6017b54fe61SJeff Layton if (signalled() || kthread_should_stop()) { 6027b54fe61SJeff Layton set_current_state(TASK_RUNNING); 6037086721fSJeff Layton return -EINTR; 6047b54fe61SJeff Layton } 6057b54fe61SJeff Layton schedule_timeout(msecs_to_jiffies(500)); 6060f0257eaSTom Tucker } 6070f0257eaSTom Tucker rqstp->rq_pages[i] = p; 6080f0257eaSTom Tucker } 6092825a7f9SJ. Bruce Fields rqstp->rq_page_end = &rqstp->rq_pages[i]; 6100f0257eaSTom Tucker rqstp->rq_pages[i++] = NULL; /* this might be seen in nfs_read_actor */ 6110f0257eaSTom Tucker 6120f0257eaSTom Tucker /* Make arg->head point to first page and arg->pages point to rest */ 6130f0257eaSTom Tucker arg = &rqstp->rq_arg; 6140f0257eaSTom Tucker arg->head[0].iov_base = page_address(rqstp->rq_pages[0]); 6150f0257eaSTom Tucker arg->head[0].iov_len = PAGE_SIZE; 6160f0257eaSTom Tucker arg->pages = rqstp->rq_pages + 1; 6170f0257eaSTom Tucker arg->page_base = 0; 6180f0257eaSTom Tucker /* save at least one page for response */ 6190f0257eaSTom Tucker arg->page_len = (pages-2)*PAGE_SIZE; 6200f0257eaSTom Tucker arg->len = (pages-1)*PAGE_SIZE; 6210f0257eaSTom Tucker arg->tail[0].iov_len = 0; 6226797fa5aSJ. Bruce Fields return 0; 6236797fa5aSJ. Bruce Fields } 6240f0257eaSTom Tucker 625e1d83ee6SRashika Kheria static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout) 6266797fa5aSJ. Bruce Fields { 6276797fa5aSJ. Bruce Fields struct svc_xprt *xprt; 6286797fa5aSJ. Bruce Fields struct svc_pool *pool = rqstp->rq_pool; 629a4aa8054STrond Myklebust long time_left = 0; 6300f0257eaSTom Tucker 631f16b6e8dSNeilBrown /* Normally we will wait up to 5 seconds for any required 632f16b6e8dSNeilBrown * cache information to be provided. 633f16b6e8dSNeilBrown */ 634f16b6e8dSNeilBrown rqstp->rq_chandle.thread_wait = 5*HZ; 635f16b6e8dSNeilBrown 6360f0257eaSTom Tucker spin_lock_bh(&pool->sp_lock); 6370f0257eaSTom Tucker xprt = svc_xprt_dequeue(pool); 6380f0257eaSTom Tucker if (xprt) { 6390f0257eaSTom Tucker rqstp->rq_xprt = xprt; 6400f0257eaSTom Tucker svc_xprt_get(xprt); 641f16b6e8dSNeilBrown 642f16b6e8dSNeilBrown /* As there is a shortage of threads and this request 6436610f720SJ. Bruce Fields * had to be queued, don't allow the thread to wait so 644f16b6e8dSNeilBrown * long for cache updates. 645f16b6e8dSNeilBrown */ 646f16b6e8dSNeilBrown rqstp->rq_chandle.thread_wait = 1*HZ; 64735525b79SAndriy Skulysh pool->sp_task_pending = 0; 6480f0257eaSTom Tucker } else { 64935525b79SAndriy Skulysh if (pool->sp_task_pending) { 65035525b79SAndriy Skulysh pool->sp_task_pending = 0; 651106f359cSTrond Myklebust xprt = ERR_PTR(-EAGAIN); 652106f359cSTrond Myklebust goto out; 65335525b79SAndriy Skulysh } 6540f0257eaSTom Tucker /* 6550f0257eaSTom Tucker * We have to be able to interrupt this wait 6560f0257eaSTom Tucker * to bring down the daemons ... 6570f0257eaSTom Tucker */ 6580f0257eaSTom Tucker set_current_state(TASK_INTERRUPTIBLE); 6597086721fSJeff Layton 660983c6844STrond Myklebust /* No data pending. Go to sleep */ 661983c6844STrond Myklebust svc_thread_enqueue(pool, rqstp); 6620f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 6630f0257eaSTom Tucker 664a4aa8054STrond Myklebust if (!(signalled() || kthread_should_stop())) { 66503cf6c9fSGreg Banks time_left = schedule_timeout(timeout); 666983c6844STrond Myklebust __set_current_state(TASK_RUNNING); 6670f0257eaSTom Tucker 6680f0257eaSTom Tucker try_to_freeze(); 6690f0257eaSTom Tucker 670106f359cSTrond Myklebust xprt = rqstp->rq_xprt; 671106f359cSTrond Myklebust if (xprt != NULL) 672106f359cSTrond Myklebust return xprt; 673a4aa8054STrond Myklebust } else 674a4aa8054STrond Myklebust __set_current_state(TASK_RUNNING); 675106f359cSTrond Myklebust 676106f359cSTrond Myklebust spin_lock_bh(&pool->sp_lock); 67703cf6c9fSGreg Banks if (!time_left) 67803cf6c9fSGreg Banks pool->sp_stats.threads_timedout++; 6790f0257eaSTom Tucker 6800f0257eaSTom Tucker xprt = rqstp->rq_xprt; 6810f0257eaSTom Tucker if (!xprt) { 6820f0257eaSTom Tucker svc_thread_dequeue(pool, rqstp); 6830f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 6840f0257eaSTom Tucker dprintk("svc: server %p, no data yet\n", rqstp); 6857086721fSJeff Layton if (signalled() || kthread_should_stop()) 6866797fa5aSJ. Bruce Fields return ERR_PTR(-EINTR); 6877086721fSJeff Layton else 6886797fa5aSJ. Bruce Fields return ERR_PTR(-EAGAIN); 6890f0257eaSTom Tucker } 6900f0257eaSTom Tucker } 691106f359cSTrond Myklebust out: 6920f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 6936797fa5aSJ. Bruce Fields return xprt; 6946797fa5aSJ. Bruce Fields } 6950f0257eaSTom Tucker 696e1d83ee6SRashika Kheria static void svc_add_new_temp_xprt(struct svc_serv *serv, struct svc_xprt *newxpt) 69765b2e665SJ. Bruce Fields { 69865b2e665SJ. Bruce Fields spin_lock_bh(&serv->sv_lock); 69965b2e665SJ. Bruce Fields set_bit(XPT_TEMP, &newxpt->xpt_flags); 70065b2e665SJ. Bruce Fields list_add(&newxpt->xpt_list, &serv->sv_tempsocks); 70165b2e665SJ. Bruce Fields serv->sv_tmpcnt++; 70265b2e665SJ. Bruce Fields if (serv->sv_temptimer.function == NULL) { 70365b2e665SJ. Bruce Fields /* setup timer to age temp transports */ 70465b2e665SJ. Bruce Fields setup_timer(&serv->sv_temptimer, svc_age_temp_xprts, 70565b2e665SJ. Bruce Fields (unsigned long)serv); 70665b2e665SJ. Bruce Fields mod_timer(&serv->sv_temptimer, 70765b2e665SJ. Bruce Fields jiffies + svc_conn_age_period * HZ); 70865b2e665SJ. Bruce Fields } 70965b2e665SJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 71065b2e665SJ. Bruce Fields svc_xprt_received(newxpt); 71165b2e665SJ. Bruce Fields } 71265b2e665SJ. Bruce Fields 7136797fa5aSJ. Bruce Fields static int svc_handle_xprt(struct svc_rqst *rqstp, struct svc_xprt *xprt) 7146797fa5aSJ. Bruce Fields { 7156797fa5aSJ. Bruce Fields struct svc_serv *serv = rqstp->rq_server; 7166797fa5aSJ. Bruce Fields int len = 0; 7176797fa5aSJ. Bruce Fields 7181b644b6eSJ. Bruce Fields if (test_bit(XPT_CLOSE, &xprt->xpt_flags)) { 7191b644b6eSJ. Bruce Fields dprintk("svc_recv: found XPT_CLOSE\n"); 7201b644b6eSJ. Bruce Fields svc_delete_xprt(xprt); 721ca7896cdSJ. Bruce Fields /* Leave XPT_BUSY set on the dead xprt: */ 7226797fa5aSJ. Bruce Fields return 0; 723ca7896cdSJ. Bruce Fields } 724ca7896cdSJ. Bruce Fields if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) { 7250f0257eaSTom Tucker struct svc_xprt *newxpt; 7260f0257eaSTom Tucker /* 7270f0257eaSTom Tucker * We know this module_get will succeed because the 7280f0257eaSTom Tucker * listener holds a reference too 7290f0257eaSTom Tucker */ 73065b2e665SJ. Bruce Fields __module_get(xprt->xpt_class->xcl_owner); 7310f0257eaSTom Tucker svc_check_conn_limits(xprt->xpt_server); 73265b2e665SJ. Bruce Fields newxpt = xprt->xpt_ops->xpo_accept(xprt); 73365b2e665SJ. Bruce Fields if (newxpt) 73465b2e665SJ. Bruce Fields svc_add_new_temp_xprt(serv, newxpt); 735c789102cSTrond Myklebust else 736c789102cSTrond Myklebust module_put(xprt->xpt_class->xcl_owner); 7379e5b208dSTrond Myklebust } else { 7386797fa5aSJ. Bruce Fields /* XPT_DATA|XPT_DEFERRED case: */ 7390f0257eaSTom Tucker dprintk("svc: server %p, pool %u, transport %p, inuse=%d\n", 7406797fa5aSJ. Bruce Fields rqstp, rqstp->rq_pool->sp_id, xprt, 7410f0257eaSTom Tucker atomic_read(&xprt->xpt_ref.refcount)); 7420f0257eaSTom Tucker rqstp->rq_deferred = svc_deferred_dequeue(xprt); 743ca7896cdSJ. Bruce Fields if (rqstp->rq_deferred) 7440f0257eaSTom Tucker len = svc_deferred_recv(rqstp); 745ca7896cdSJ. Bruce Fields else 7460f0257eaSTom Tucker len = xprt->xpt_ops->xpo_recvfrom(rqstp); 7470f0257eaSTom Tucker dprintk("svc: got len=%d\n", len); 748d10f27a7SJ. Bruce Fields rqstp->rq_reserved = serv->sv_max_mesg; 749d10f27a7SJ. Bruce Fields atomic_add(rqstp->rq_reserved, &xprt->xpt_reserved); 7500f0257eaSTom Tucker } 7516797fa5aSJ. Bruce Fields /* clear XPT_BUSY: */ 752ca7896cdSJ. Bruce Fields svc_xprt_received(xprt); 7536797fa5aSJ. Bruce Fields return len; 7546797fa5aSJ. Bruce Fields } 7556797fa5aSJ. Bruce Fields 7566797fa5aSJ. Bruce Fields /* 7576797fa5aSJ. Bruce Fields * Receive the next request on any transport. This code is carefully 7586797fa5aSJ. Bruce Fields * organised not to touch any cachelines in the shared svc_serv 7596797fa5aSJ. Bruce Fields * structure, only cachelines in the local svc_pool. 7606797fa5aSJ. Bruce Fields */ 7616797fa5aSJ. Bruce Fields int svc_recv(struct svc_rqst *rqstp, long timeout) 7626797fa5aSJ. Bruce Fields { 7636797fa5aSJ. Bruce Fields struct svc_xprt *xprt = NULL; 7646797fa5aSJ. Bruce Fields struct svc_serv *serv = rqstp->rq_server; 7656797fa5aSJ. Bruce Fields int len, err; 7666797fa5aSJ. Bruce Fields 7676797fa5aSJ. Bruce Fields dprintk("svc: server %p waiting for data (to = %ld)\n", 7686797fa5aSJ. Bruce Fields rqstp, timeout); 7696797fa5aSJ. Bruce Fields 7706797fa5aSJ. Bruce Fields if (rqstp->rq_xprt) 7716797fa5aSJ. Bruce Fields printk(KERN_ERR 7726797fa5aSJ. Bruce Fields "svc_recv: service %p, transport not NULL!\n", 7736797fa5aSJ. Bruce Fields rqstp); 774983c6844STrond Myklebust 7756797fa5aSJ. Bruce Fields err = svc_alloc_arg(rqstp); 7766797fa5aSJ. Bruce Fields if (err) 777860a0d9eSJeff Layton goto out; 7786797fa5aSJ. Bruce Fields 7796797fa5aSJ. Bruce Fields try_to_freeze(); 7806797fa5aSJ. Bruce Fields cond_resched(); 781860a0d9eSJeff Layton err = -EINTR; 7826797fa5aSJ. Bruce Fields if (signalled() || kthread_should_stop()) 783860a0d9eSJeff Layton goto out; 7846797fa5aSJ. Bruce Fields 7856797fa5aSJ. Bruce Fields xprt = svc_get_next_xprt(rqstp, timeout); 786860a0d9eSJeff Layton if (IS_ERR(xprt)) { 787860a0d9eSJeff Layton err = PTR_ERR(xprt); 788860a0d9eSJeff Layton goto out; 789860a0d9eSJeff Layton } 7906797fa5aSJ. Bruce Fields 7916797fa5aSJ. Bruce Fields len = svc_handle_xprt(rqstp, xprt); 7920f0257eaSTom Tucker 7930f0257eaSTom Tucker /* No data, incomplete (TCP) read, or accept() */ 794860a0d9eSJeff Layton err = -EAGAIN; 7959f9d2ebeSJ. Bruce Fields if (len <= 0) 796860a0d9eSJeff Layton goto out_release; 797ca7896cdSJ. Bruce Fields 7980f0257eaSTom Tucker clear_bit(XPT_OLD, &xprt->xpt_flags); 7990f0257eaSTom Tucker 8004d152e2cSJeff Layton if (xprt->xpt_ops->xpo_secure_port(rqstp)) 8014d152e2cSJeff Layton set_bit(RQ_SECURE, &rqstp->rq_flags); 8024d152e2cSJeff Layton else 8034d152e2cSJeff Layton clear_bit(RQ_SECURE, &rqstp->rq_flags); 8040f0257eaSTom Tucker rqstp->rq_chandle.defer = svc_defer; 805860a0d9eSJeff Layton rqstp->rq_xid = svc_getu32(&rqstp->rq_arg.head[0]); 8060f0257eaSTom Tucker 8070f0257eaSTom Tucker if (serv->sv_stats) 8080f0257eaSTom Tucker serv->sv_stats->netcnt++; 809860a0d9eSJeff Layton trace_svc_recv(rqstp, len); 8100f0257eaSTom Tucker return len; 811860a0d9eSJeff Layton out_release: 812ca7896cdSJ. Bruce Fields rqstp->rq_res.len = 0; 813ca7896cdSJ. Bruce Fields svc_xprt_release(rqstp); 814860a0d9eSJeff Layton out: 815860a0d9eSJeff Layton trace_svc_recv(rqstp, err); 816860a0d9eSJeff Layton return err; 8170f0257eaSTom Tucker } 81824c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_recv); 8190f0257eaSTom Tucker 8200f0257eaSTom Tucker /* 8210f0257eaSTom Tucker * Drop request 8220f0257eaSTom Tucker */ 8230f0257eaSTom Tucker void svc_drop(struct svc_rqst *rqstp) 8240f0257eaSTom Tucker { 8250f0257eaSTom Tucker dprintk("svc: xprt %p dropped request\n", rqstp->rq_xprt); 8260f0257eaSTom Tucker svc_xprt_release(rqstp); 8270f0257eaSTom Tucker } 82824c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_drop); 8290f0257eaSTom Tucker 8300f0257eaSTom Tucker /* 8310f0257eaSTom Tucker * Return reply to client. 8320f0257eaSTom Tucker */ 8330f0257eaSTom Tucker int svc_send(struct svc_rqst *rqstp) 8340f0257eaSTom Tucker { 8350f0257eaSTom Tucker struct svc_xprt *xprt; 836860a0d9eSJeff Layton int len = -EFAULT; 8370f0257eaSTom Tucker struct xdr_buf *xb; 8380f0257eaSTom Tucker 8390f0257eaSTom Tucker xprt = rqstp->rq_xprt; 8400f0257eaSTom Tucker if (!xprt) 841860a0d9eSJeff Layton goto out; 8420f0257eaSTom Tucker 8430f0257eaSTom Tucker /* release the receive skb before sending the reply */ 8440f0257eaSTom Tucker rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); 8450f0257eaSTom Tucker 8460f0257eaSTom Tucker /* calculate over-all length */ 8470f0257eaSTom Tucker xb = &rqstp->rq_res; 8480f0257eaSTom Tucker xb->len = xb->head[0].iov_len + 8490f0257eaSTom Tucker xb->page_len + 8500f0257eaSTom Tucker xb->tail[0].iov_len; 8510f0257eaSTom Tucker 8520f0257eaSTom Tucker /* Grab mutex to serialize outgoing data. */ 8530f0257eaSTom Tucker mutex_lock(&xprt->xpt_mutex); 854f06f00a2SJ. Bruce Fields if (test_bit(XPT_DEAD, &xprt->xpt_flags) 855f06f00a2SJ. Bruce Fields || test_bit(XPT_CLOSE, &xprt->xpt_flags)) 8560f0257eaSTom Tucker len = -ENOTCONN; 8570f0257eaSTom Tucker else 8580f0257eaSTom Tucker len = xprt->xpt_ops->xpo_sendto(rqstp); 8590f0257eaSTom Tucker mutex_unlock(&xprt->xpt_mutex); 8604cfc7e60SRahul Iyer rpc_wake_up(&xprt->xpt_bc_pending); 8610f0257eaSTom Tucker svc_xprt_release(rqstp); 8620f0257eaSTom Tucker 8630f0257eaSTom Tucker if (len == -ECONNREFUSED || len == -ENOTCONN || len == -EAGAIN) 864860a0d9eSJeff Layton len = 0; 865860a0d9eSJeff Layton out: 866860a0d9eSJeff Layton trace_svc_send(rqstp, len); 8670f0257eaSTom Tucker return len; 8680f0257eaSTom Tucker } 8690f0257eaSTom Tucker 8700f0257eaSTom Tucker /* 8710f0257eaSTom Tucker * Timer function to close old temporary transports, using 8720f0257eaSTom Tucker * a mark-and-sweep algorithm. 8730f0257eaSTom Tucker */ 8740f0257eaSTom Tucker static void svc_age_temp_xprts(unsigned long closure) 8750f0257eaSTom Tucker { 8760f0257eaSTom Tucker struct svc_serv *serv = (struct svc_serv *)closure; 8770f0257eaSTom Tucker struct svc_xprt *xprt; 8780f0257eaSTom Tucker struct list_head *le, *next; 8790f0257eaSTom Tucker 8800f0257eaSTom Tucker dprintk("svc_age_temp_xprts\n"); 8810f0257eaSTom Tucker 8820f0257eaSTom Tucker if (!spin_trylock_bh(&serv->sv_lock)) { 8830f0257eaSTom Tucker /* busy, try again 1 sec later */ 8840f0257eaSTom Tucker dprintk("svc_age_temp_xprts: busy\n"); 8850f0257eaSTom Tucker mod_timer(&serv->sv_temptimer, jiffies + HZ); 8860f0257eaSTom Tucker return; 8870f0257eaSTom Tucker } 8880f0257eaSTom Tucker 8890f0257eaSTom Tucker list_for_each_safe(le, next, &serv->sv_tempsocks) { 8900f0257eaSTom Tucker xprt = list_entry(le, struct svc_xprt, xpt_list); 8910f0257eaSTom Tucker 8920f0257eaSTom Tucker /* First time through, just mark it OLD. Second time 8930f0257eaSTom Tucker * through, close it. */ 8940f0257eaSTom Tucker if (!test_and_set_bit(XPT_OLD, &xprt->xpt_flags)) 8950f0257eaSTom Tucker continue; 896f64f9e71SJoe Perches if (atomic_read(&xprt->xpt_ref.refcount) > 1 || 897f64f9e71SJoe Perches test_bit(XPT_BUSY, &xprt->xpt_flags)) 8980f0257eaSTom Tucker continue; 899e75bafbfSJ. Bruce Fields list_del_init(le); 9000f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 9010f0257eaSTom Tucker dprintk("queuing xprt %p for closing\n", xprt); 9020f0257eaSTom Tucker 9030f0257eaSTom Tucker /* a thread will dequeue and close it soon */ 9040f0257eaSTom Tucker svc_xprt_enqueue(xprt); 9050f0257eaSTom Tucker } 906e75bafbfSJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 9070f0257eaSTom Tucker 9080f0257eaSTom Tucker mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ); 9090f0257eaSTom Tucker } 9100f0257eaSTom Tucker 911edc7a894SJ. Bruce Fields static void call_xpt_users(struct svc_xprt *xprt) 912edc7a894SJ. Bruce Fields { 913edc7a894SJ. Bruce Fields struct svc_xpt_user *u; 914edc7a894SJ. Bruce Fields 915edc7a894SJ. Bruce Fields spin_lock(&xprt->xpt_lock); 916edc7a894SJ. Bruce Fields while (!list_empty(&xprt->xpt_users)) { 917edc7a894SJ. Bruce Fields u = list_first_entry(&xprt->xpt_users, struct svc_xpt_user, list); 918edc7a894SJ. Bruce Fields list_del(&u->list); 919edc7a894SJ. Bruce Fields u->callback(u); 920edc7a894SJ. Bruce Fields } 921edc7a894SJ. Bruce Fields spin_unlock(&xprt->xpt_lock); 922edc7a894SJ. Bruce Fields } 923edc7a894SJ. Bruce Fields 9240f0257eaSTom Tucker /* 9250f0257eaSTom Tucker * Remove a dead transport 9260f0257eaSTom Tucker */ 9277710ec36SJ. Bruce Fields static void svc_delete_xprt(struct svc_xprt *xprt) 9280f0257eaSTom Tucker { 9290f0257eaSTom Tucker struct svc_serv *serv = xprt->xpt_server; 93022945e4aSTom Tucker struct svc_deferred_req *dr; 93122945e4aSTom Tucker 93222945e4aSTom Tucker /* Only do this once */ 93322945e4aSTom Tucker if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags)) 934ac9303ebSJ. Bruce Fields BUG(); 9350f0257eaSTom Tucker 9360f0257eaSTom Tucker dprintk("svc: svc_delete_xprt(%p)\n", xprt); 9370f0257eaSTom Tucker xprt->xpt_ops->xpo_detach(xprt); 9380f0257eaSTom Tucker 9390f0257eaSTom Tucker spin_lock_bh(&serv->sv_lock); 9400f0257eaSTom Tucker list_del_init(&xprt->xpt_list); 94101047298SWeston Andros Adamson WARN_ON_ONCE(!list_empty(&xprt->xpt_ready)); 9420f0257eaSTom Tucker if (test_bit(XPT_TEMP, &xprt->xpt_flags)) 9430f0257eaSTom Tucker serv->sv_tmpcnt--; 944788e69e5SJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 94522945e4aSTom Tucker 946ab1b18f7SNeil Brown while ((dr = svc_deferred_dequeue(xprt)) != NULL) 94722945e4aSTom Tucker kfree(dr); 94822945e4aSTom Tucker 949edc7a894SJ. Bruce Fields call_xpt_users(xprt); 95022945e4aSTom Tucker svc_xprt_put(xprt); 9510f0257eaSTom Tucker } 9520f0257eaSTom Tucker 9530f0257eaSTom Tucker void svc_close_xprt(struct svc_xprt *xprt) 9540f0257eaSTom Tucker { 9550f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 9560f0257eaSTom Tucker if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) 9570f0257eaSTom Tucker /* someone else will have to effect the close */ 9580f0257eaSTom Tucker return; 959b1763316SJ. Bruce Fields /* 960b1763316SJ. Bruce Fields * We expect svc_close_xprt() to work even when no threads are 961b1763316SJ. Bruce Fields * running (e.g., while configuring the server before starting 962b1763316SJ. Bruce Fields * any threads), so if the transport isn't busy, we delete 963b1763316SJ. Bruce Fields * it ourself: 964b1763316SJ. Bruce Fields */ 9650f0257eaSTom Tucker svc_delete_xprt(xprt); 9660f0257eaSTom Tucker } 967a217813fSTom Tucker EXPORT_SYMBOL_GPL(svc_close_xprt); 9680f0257eaSTom Tucker 969cc630d9fSJ. Bruce Fields static int svc_close_list(struct svc_serv *serv, struct list_head *xprt_list, struct net *net) 9700f0257eaSTom Tucker { 9710f0257eaSTom Tucker struct svc_xprt *xprt; 972cc630d9fSJ. Bruce Fields int ret = 0; 9730f0257eaSTom Tucker 974719f8bccSJ. Bruce Fields spin_lock(&serv->sv_lock); 975b4f36f88SJ. Bruce Fields list_for_each_entry(xprt, xprt_list, xpt_list) { 9767b147f1fSStanislav Kinsbursky if (xprt->xpt_net != net) 9777b147f1fSStanislav Kinsbursky continue; 978cc630d9fSJ. Bruce Fields ret++; 9790f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 980cc630d9fSJ. Bruce Fields svc_xprt_enqueue(xprt); 9810f0257eaSTom Tucker } 982719f8bccSJ. Bruce Fields spin_unlock(&serv->sv_lock); 983cc630d9fSJ. Bruce Fields return ret; 9840f0257eaSTom Tucker } 9850f0257eaSTom Tucker 986cc630d9fSJ. Bruce Fields static struct svc_xprt *svc_dequeue_net(struct svc_serv *serv, struct net *net) 9872fefb8a0SJ. Bruce Fields { 988b4f36f88SJ. Bruce Fields struct svc_pool *pool; 989b4f36f88SJ. Bruce Fields struct svc_xprt *xprt; 990b4f36f88SJ. Bruce Fields struct svc_xprt *tmp; 991b4f36f88SJ. Bruce Fields int i; 992b4f36f88SJ. Bruce Fields 993b4f36f88SJ. Bruce Fields for (i = 0; i < serv->sv_nrpools; i++) { 994b4f36f88SJ. Bruce Fields pool = &serv->sv_pools[i]; 995b4f36f88SJ. Bruce Fields 996b4f36f88SJ. Bruce Fields spin_lock_bh(&pool->sp_lock); 9976f513365SStanislav Kinsbursky list_for_each_entry_safe(xprt, tmp, &pool->sp_sockets, xpt_ready) { 9987b147f1fSStanislav Kinsbursky if (xprt->xpt_net != net) 9997b147f1fSStanislav Kinsbursky continue; 1000b4f36f88SJ. Bruce Fields list_del_init(&xprt->xpt_ready); 1001cc630d9fSJ. Bruce Fields spin_unlock_bh(&pool->sp_lock); 1002cc630d9fSJ. Bruce Fields return xprt; 1003b4f36f88SJ. Bruce Fields } 1004b4f36f88SJ. Bruce Fields spin_unlock_bh(&pool->sp_lock); 1005b4f36f88SJ. Bruce Fields } 1006cc630d9fSJ. Bruce Fields return NULL; 10076f513365SStanislav Kinsbursky } 10086f513365SStanislav Kinsbursky 1009cc630d9fSJ. Bruce Fields static void svc_clean_up_xprts(struct svc_serv *serv, struct net *net) 10106f513365SStanislav Kinsbursky { 10116f513365SStanislav Kinsbursky struct svc_xprt *xprt; 10126f513365SStanislav Kinsbursky 1013cc630d9fSJ. Bruce Fields while ((xprt = svc_dequeue_net(serv, net))) { 1014cc630d9fSJ. Bruce Fields set_bit(XPT_CLOSE, &xprt->xpt_flags); 1015719f8bccSJ. Bruce Fields svc_delete_xprt(xprt); 10163a22bf50SStanislav Kinsbursky } 1017cc630d9fSJ. Bruce Fields } 10183a22bf50SStanislav Kinsbursky 1019cc630d9fSJ. Bruce Fields /* 1020cc630d9fSJ. Bruce Fields * Server threads may still be running (especially in the case where the 1021cc630d9fSJ. Bruce Fields * service is still running in other network namespaces). 1022cc630d9fSJ. Bruce Fields * 1023cc630d9fSJ. Bruce Fields * So we shut down sockets the same way we would on a running server, by 1024cc630d9fSJ. Bruce Fields * setting XPT_CLOSE, enqueuing, and letting a thread pick it up to do 1025cc630d9fSJ. Bruce Fields * the close. In the case there are no such other threads, 1026cc630d9fSJ. Bruce Fields * threads running, svc_clean_up_xprts() does a simple version of a 1027cc630d9fSJ. Bruce Fields * server's main event loop, and in the case where there are other 1028cc630d9fSJ. Bruce Fields * threads, we may need to wait a little while and then check again to 1029cc630d9fSJ. Bruce Fields * see if they're done. 1030cc630d9fSJ. Bruce Fields */ 10317b147f1fSStanislav Kinsbursky void svc_close_net(struct svc_serv *serv, struct net *net) 10323a22bf50SStanislav Kinsbursky { 1033cc630d9fSJ. Bruce Fields int delay = 0; 10346f513365SStanislav Kinsbursky 1035cc630d9fSJ. Bruce Fields while (svc_close_list(serv, &serv->sv_permsocks, net) + 1036cc630d9fSJ. Bruce Fields svc_close_list(serv, &serv->sv_tempsocks, net)) { 1037cc630d9fSJ. Bruce Fields 1038cc630d9fSJ. Bruce Fields svc_clean_up_xprts(serv, net); 1039cc630d9fSJ. Bruce Fields msleep(delay++); 1040cc630d9fSJ. Bruce Fields } 10412fefb8a0SJ. Bruce Fields } 10422fefb8a0SJ. Bruce Fields 10430f0257eaSTom Tucker /* 10440f0257eaSTom Tucker * Handle defer and revisit of requests 10450f0257eaSTom Tucker */ 10460f0257eaSTom Tucker 10470f0257eaSTom Tucker static void svc_revisit(struct cache_deferred_req *dreq, int too_many) 10480f0257eaSTom Tucker { 10490f0257eaSTom Tucker struct svc_deferred_req *dr = 10500f0257eaSTom Tucker container_of(dreq, struct svc_deferred_req, handle); 10510f0257eaSTom Tucker struct svc_xprt *xprt = dr->xprt; 10520f0257eaSTom Tucker 105322945e4aSTom Tucker spin_lock(&xprt->xpt_lock); 105422945e4aSTom Tucker set_bit(XPT_DEFERRED, &xprt->xpt_flags); 105522945e4aSTom Tucker if (too_many || test_bit(XPT_DEAD, &xprt->xpt_flags)) { 105622945e4aSTom Tucker spin_unlock(&xprt->xpt_lock); 105722945e4aSTom Tucker dprintk("revisit canceled\n"); 10580f0257eaSTom Tucker svc_xprt_put(xprt); 10590f0257eaSTom Tucker kfree(dr); 10600f0257eaSTom Tucker return; 10610f0257eaSTom Tucker } 10620f0257eaSTom Tucker dprintk("revisit queued\n"); 10630f0257eaSTom Tucker dr->xprt = NULL; 10640f0257eaSTom Tucker list_add(&dr->handle.recent, &xprt->xpt_deferred); 10650f0257eaSTom Tucker spin_unlock(&xprt->xpt_lock); 10660f0257eaSTom Tucker svc_xprt_enqueue(xprt); 10670f0257eaSTom Tucker svc_xprt_put(xprt); 10680f0257eaSTom Tucker } 10690f0257eaSTom Tucker 1070260c1d12STom Tucker /* 1071260c1d12STom Tucker * Save the request off for later processing. The request buffer looks 1072260c1d12STom Tucker * like this: 1073260c1d12STom Tucker * 1074260c1d12STom Tucker * <xprt-header><rpc-header><rpc-pagelist><rpc-tail> 1075260c1d12STom Tucker * 1076260c1d12STom Tucker * This code can only handle requests that consist of an xprt-header 1077260c1d12STom Tucker * and rpc-header. 1078260c1d12STom Tucker */ 10790f0257eaSTom Tucker static struct cache_deferred_req *svc_defer(struct cache_req *req) 10800f0257eaSTom Tucker { 10810f0257eaSTom Tucker struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle); 10820f0257eaSTom Tucker struct svc_deferred_req *dr; 10830f0257eaSTom Tucker 108430660e04SJeff Layton if (rqstp->rq_arg.page_len || !test_bit(RQ_USEDEFERRAL, &rqstp->rq_flags)) 10850f0257eaSTom Tucker return NULL; /* if more than a page, give up FIXME */ 10860f0257eaSTom Tucker if (rqstp->rq_deferred) { 10870f0257eaSTom Tucker dr = rqstp->rq_deferred; 10880f0257eaSTom Tucker rqstp->rq_deferred = NULL; 10890f0257eaSTom Tucker } else { 1090260c1d12STom Tucker size_t skip; 1091260c1d12STom Tucker size_t size; 10920f0257eaSTom Tucker /* FIXME maybe discard if size too large */ 1093260c1d12STom Tucker size = sizeof(struct svc_deferred_req) + rqstp->rq_arg.len; 10940f0257eaSTom Tucker dr = kmalloc(size, GFP_KERNEL); 10950f0257eaSTom Tucker if (dr == NULL) 10960f0257eaSTom Tucker return NULL; 10970f0257eaSTom Tucker 10980f0257eaSTom Tucker dr->handle.owner = rqstp->rq_server; 10990f0257eaSTom Tucker dr->prot = rqstp->rq_prot; 11000f0257eaSTom Tucker memcpy(&dr->addr, &rqstp->rq_addr, rqstp->rq_addrlen); 11010f0257eaSTom Tucker dr->addrlen = rqstp->rq_addrlen; 11020f0257eaSTom Tucker dr->daddr = rqstp->rq_daddr; 11030f0257eaSTom Tucker dr->argslen = rqstp->rq_arg.len >> 2; 1104260c1d12STom Tucker dr->xprt_hlen = rqstp->rq_xprt_hlen; 1105260c1d12STom Tucker 1106260c1d12STom Tucker /* back up head to the start of the buffer and copy */ 1107260c1d12STom Tucker skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; 11080f0257eaSTom Tucker memcpy(dr->args, rqstp->rq_arg.head[0].iov_base - skip, 11090f0257eaSTom Tucker dr->argslen << 2); 11100f0257eaSTom Tucker } 11110f0257eaSTom Tucker svc_xprt_get(rqstp->rq_xprt); 11120f0257eaSTom Tucker dr->xprt = rqstp->rq_xprt; 111378b65eb3SJeff Layton set_bit(RQ_DROPME, &rqstp->rq_flags); 11140f0257eaSTom Tucker 11150f0257eaSTom Tucker dr->handle.revisit = svc_revisit; 11160f0257eaSTom Tucker return &dr->handle; 11170f0257eaSTom Tucker } 11180f0257eaSTom Tucker 11190f0257eaSTom Tucker /* 11200f0257eaSTom Tucker * recv data from a deferred request into an active one 11210f0257eaSTom Tucker */ 11220f0257eaSTom Tucker static int svc_deferred_recv(struct svc_rqst *rqstp) 11230f0257eaSTom Tucker { 11240f0257eaSTom Tucker struct svc_deferred_req *dr = rqstp->rq_deferred; 11250f0257eaSTom Tucker 1126260c1d12STom Tucker /* setup iov_base past transport header */ 1127260c1d12STom Tucker rqstp->rq_arg.head[0].iov_base = dr->args + (dr->xprt_hlen>>2); 1128260c1d12STom Tucker /* The iov_len does not include the transport header bytes */ 1129260c1d12STom Tucker rqstp->rq_arg.head[0].iov_len = (dr->argslen<<2) - dr->xprt_hlen; 11300f0257eaSTom Tucker rqstp->rq_arg.page_len = 0; 1131260c1d12STom Tucker /* The rq_arg.len includes the transport header bytes */ 11320f0257eaSTom Tucker rqstp->rq_arg.len = dr->argslen<<2; 11330f0257eaSTom Tucker rqstp->rq_prot = dr->prot; 11340f0257eaSTom Tucker memcpy(&rqstp->rq_addr, &dr->addr, dr->addrlen); 11350f0257eaSTom Tucker rqstp->rq_addrlen = dr->addrlen; 1136260c1d12STom Tucker /* Save off transport header len in case we get deferred again */ 1137260c1d12STom Tucker rqstp->rq_xprt_hlen = dr->xprt_hlen; 11380f0257eaSTom Tucker rqstp->rq_daddr = dr->daddr; 11390f0257eaSTom Tucker rqstp->rq_respages = rqstp->rq_pages; 1140260c1d12STom Tucker return (dr->argslen<<2) - dr->xprt_hlen; 11410f0257eaSTom Tucker } 11420f0257eaSTom Tucker 11430f0257eaSTom Tucker 11440f0257eaSTom Tucker static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt) 11450f0257eaSTom Tucker { 11460f0257eaSTom Tucker struct svc_deferred_req *dr = NULL; 11470f0257eaSTom Tucker 11480f0257eaSTom Tucker if (!test_bit(XPT_DEFERRED, &xprt->xpt_flags)) 11490f0257eaSTom Tucker return NULL; 11500f0257eaSTom Tucker spin_lock(&xprt->xpt_lock); 11510f0257eaSTom Tucker if (!list_empty(&xprt->xpt_deferred)) { 11520f0257eaSTom Tucker dr = list_entry(xprt->xpt_deferred.next, 11530f0257eaSTom Tucker struct svc_deferred_req, 11540f0257eaSTom Tucker handle.recent); 11550f0257eaSTom Tucker list_del_init(&dr->handle.recent); 115662bac4afSJ. Bruce Fields } else 115762bac4afSJ. Bruce Fields clear_bit(XPT_DEFERRED, &xprt->xpt_flags); 11580f0257eaSTom Tucker spin_unlock(&xprt->xpt_lock); 11590f0257eaSTom Tucker return dr; 11600f0257eaSTom Tucker } 11617fcb98d5STom Tucker 1162156e6209SChuck Lever /** 1163156e6209SChuck Lever * svc_find_xprt - find an RPC transport instance 1164156e6209SChuck Lever * @serv: pointer to svc_serv to search 1165156e6209SChuck Lever * @xcl_name: C string containing transport's class name 11664cb54ca2SStanislav Kinsbursky * @net: owner net pointer 1167156e6209SChuck Lever * @af: Address family of transport's local address 1168156e6209SChuck Lever * @port: transport's IP port number 1169156e6209SChuck Lever * 11707fcb98d5STom Tucker * Return the transport instance pointer for the endpoint accepting 11717fcb98d5STom Tucker * connections/peer traffic from the specified transport class, 11727fcb98d5STom Tucker * address family and port. 11737fcb98d5STom Tucker * 11747fcb98d5STom Tucker * Specifying 0 for the address family or port is effectively a 11757fcb98d5STom Tucker * wild-card, and will result in matching the first transport in the 11767fcb98d5STom Tucker * service's list that has a matching class name. 11777fcb98d5STom Tucker */ 1178156e6209SChuck Lever struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name, 11794cb54ca2SStanislav Kinsbursky struct net *net, const sa_family_t af, 11804cb54ca2SStanislav Kinsbursky const unsigned short port) 11817fcb98d5STom Tucker { 11827fcb98d5STom Tucker struct svc_xprt *xprt; 11837fcb98d5STom Tucker struct svc_xprt *found = NULL; 11847fcb98d5STom Tucker 11857fcb98d5STom Tucker /* Sanity check the args */ 1186156e6209SChuck Lever if (serv == NULL || xcl_name == NULL) 11877fcb98d5STom Tucker return found; 11887fcb98d5STom Tucker 11897fcb98d5STom Tucker spin_lock_bh(&serv->sv_lock); 11907fcb98d5STom Tucker list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { 11914cb54ca2SStanislav Kinsbursky if (xprt->xpt_net != net) 11924cb54ca2SStanislav Kinsbursky continue; 11937fcb98d5STom Tucker if (strcmp(xprt->xpt_class->xcl_name, xcl_name)) 11947fcb98d5STom Tucker continue; 11957fcb98d5STom Tucker if (af != AF_UNSPEC && af != xprt->xpt_local.ss_family) 11967fcb98d5STom Tucker continue; 1197156e6209SChuck Lever if (port != 0 && port != svc_xprt_local_port(xprt)) 11987fcb98d5STom Tucker continue; 11997fcb98d5STom Tucker found = xprt; 1200a217813fSTom Tucker svc_xprt_get(xprt); 12017fcb98d5STom Tucker break; 12027fcb98d5STom Tucker } 12037fcb98d5STom Tucker spin_unlock_bh(&serv->sv_lock); 12047fcb98d5STom Tucker return found; 12057fcb98d5STom Tucker } 12067fcb98d5STom Tucker EXPORT_SYMBOL_GPL(svc_find_xprt); 12079571af18STom Tucker 1208335c54bdSChuck Lever static int svc_one_xprt_name(const struct svc_xprt *xprt, 1209335c54bdSChuck Lever char *pos, int remaining) 1210335c54bdSChuck Lever { 1211335c54bdSChuck Lever int len; 1212335c54bdSChuck Lever 1213335c54bdSChuck Lever len = snprintf(pos, remaining, "%s %u\n", 1214335c54bdSChuck Lever xprt->xpt_class->xcl_name, 1215335c54bdSChuck Lever svc_xprt_local_port(xprt)); 1216335c54bdSChuck Lever if (len >= remaining) 1217335c54bdSChuck Lever return -ENAMETOOLONG; 1218335c54bdSChuck Lever return len; 1219335c54bdSChuck Lever } 1220335c54bdSChuck Lever 1221335c54bdSChuck Lever /** 1222335c54bdSChuck Lever * svc_xprt_names - format a buffer with a list of transport names 1223335c54bdSChuck Lever * @serv: pointer to an RPC service 1224335c54bdSChuck Lever * @buf: pointer to a buffer to be filled in 1225335c54bdSChuck Lever * @buflen: length of buffer to be filled in 1226335c54bdSChuck Lever * 1227335c54bdSChuck Lever * Fills in @buf with a string containing a list of transport names, 1228335c54bdSChuck Lever * each name terminated with '\n'. 1229335c54bdSChuck Lever * 1230335c54bdSChuck Lever * Returns positive length of the filled-in string on success; otherwise 1231335c54bdSChuck Lever * a negative errno value is returned if an error occurs. 12329571af18STom Tucker */ 1233335c54bdSChuck Lever int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen) 12349571af18STom Tucker { 12359571af18STom Tucker struct svc_xprt *xprt; 1236335c54bdSChuck Lever int len, totlen; 1237335c54bdSChuck Lever char *pos; 12389571af18STom Tucker 12399571af18STom Tucker /* Sanity check args */ 12409571af18STom Tucker if (!serv) 12419571af18STom Tucker return 0; 12429571af18STom Tucker 12439571af18STom Tucker spin_lock_bh(&serv->sv_lock); 1244335c54bdSChuck Lever 1245335c54bdSChuck Lever pos = buf; 1246335c54bdSChuck Lever totlen = 0; 12479571af18STom Tucker list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { 1248335c54bdSChuck Lever len = svc_one_xprt_name(xprt, pos, buflen - totlen); 1249335c54bdSChuck Lever if (len < 0) { 1250335c54bdSChuck Lever *buf = '\0'; 1251335c54bdSChuck Lever totlen = len; 1252335c54bdSChuck Lever } 1253335c54bdSChuck Lever if (len <= 0) 12549571af18STom Tucker break; 1255335c54bdSChuck Lever 1256335c54bdSChuck Lever pos += len; 12579571af18STom Tucker totlen += len; 12589571af18STom Tucker } 1259335c54bdSChuck Lever 12609571af18STom Tucker spin_unlock_bh(&serv->sv_lock); 12619571af18STom Tucker return totlen; 12629571af18STom Tucker } 12639571af18STom Tucker EXPORT_SYMBOL_GPL(svc_xprt_names); 126403cf6c9fSGreg Banks 126503cf6c9fSGreg Banks 126603cf6c9fSGreg Banks /*----------------------------------------------------------------------------*/ 126703cf6c9fSGreg Banks 126803cf6c9fSGreg Banks static void *svc_pool_stats_start(struct seq_file *m, loff_t *pos) 126903cf6c9fSGreg Banks { 127003cf6c9fSGreg Banks unsigned int pidx = (unsigned int)*pos; 127103cf6c9fSGreg Banks struct svc_serv *serv = m->private; 127203cf6c9fSGreg Banks 127303cf6c9fSGreg Banks dprintk("svc_pool_stats_start, *pidx=%u\n", pidx); 127403cf6c9fSGreg Banks 127503cf6c9fSGreg Banks if (!pidx) 127603cf6c9fSGreg Banks return SEQ_START_TOKEN; 127703cf6c9fSGreg Banks return (pidx > serv->sv_nrpools ? NULL : &serv->sv_pools[pidx-1]); 127803cf6c9fSGreg Banks } 127903cf6c9fSGreg Banks 128003cf6c9fSGreg Banks static void *svc_pool_stats_next(struct seq_file *m, void *p, loff_t *pos) 128103cf6c9fSGreg Banks { 128203cf6c9fSGreg Banks struct svc_pool *pool = p; 128303cf6c9fSGreg Banks struct svc_serv *serv = m->private; 128403cf6c9fSGreg Banks 128503cf6c9fSGreg Banks dprintk("svc_pool_stats_next, *pos=%llu\n", *pos); 128603cf6c9fSGreg Banks 128703cf6c9fSGreg Banks if (p == SEQ_START_TOKEN) { 128803cf6c9fSGreg Banks pool = &serv->sv_pools[0]; 128903cf6c9fSGreg Banks } else { 129003cf6c9fSGreg Banks unsigned int pidx = (pool - &serv->sv_pools[0]); 129103cf6c9fSGreg Banks if (pidx < serv->sv_nrpools-1) 129203cf6c9fSGreg Banks pool = &serv->sv_pools[pidx+1]; 129303cf6c9fSGreg Banks else 129403cf6c9fSGreg Banks pool = NULL; 129503cf6c9fSGreg Banks } 129603cf6c9fSGreg Banks ++*pos; 129703cf6c9fSGreg Banks return pool; 129803cf6c9fSGreg Banks } 129903cf6c9fSGreg Banks 130003cf6c9fSGreg Banks static void svc_pool_stats_stop(struct seq_file *m, void *p) 130103cf6c9fSGreg Banks { 130203cf6c9fSGreg Banks } 130303cf6c9fSGreg Banks 130403cf6c9fSGreg Banks static int svc_pool_stats_show(struct seq_file *m, void *p) 130503cf6c9fSGreg Banks { 130603cf6c9fSGreg Banks struct svc_pool *pool = p; 130703cf6c9fSGreg Banks 130803cf6c9fSGreg Banks if (p == SEQ_START_TOKEN) { 130978c210efSJ. Bruce Fields seq_puts(m, "# pool packets-arrived sockets-enqueued threads-woken threads-timedout\n"); 131003cf6c9fSGreg Banks return 0; 131103cf6c9fSGreg Banks } 131203cf6c9fSGreg Banks 131378c210efSJ. Bruce Fields seq_printf(m, "%u %lu %lu %lu %lu\n", 131403cf6c9fSGreg Banks pool->sp_id, 131503cf6c9fSGreg Banks pool->sp_stats.packets, 131603cf6c9fSGreg Banks pool->sp_stats.sockets_queued, 131703cf6c9fSGreg Banks pool->sp_stats.threads_woken, 131803cf6c9fSGreg Banks pool->sp_stats.threads_timedout); 131903cf6c9fSGreg Banks 132003cf6c9fSGreg Banks return 0; 132103cf6c9fSGreg Banks } 132203cf6c9fSGreg Banks 132303cf6c9fSGreg Banks static const struct seq_operations svc_pool_stats_seq_ops = { 132403cf6c9fSGreg Banks .start = svc_pool_stats_start, 132503cf6c9fSGreg Banks .next = svc_pool_stats_next, 132603cf6c9fSGreg Banks .stop = svc_pool_stats_stop, 132703cf6c9fSGreg Banks .show = svc_pool_stats_show, 132803cf6c9fSGreg Banks }; 132903cf6c9fSGreg Banks 133003cf6c9fSGreg Banks int svc_pool_stats_open(struct svc_serv *serv, struct file *file) 133103cf6c9fSGreg Banks { 133203cf6c9fSGreg Banks int err; 133303cf6c9fSGreg Banks 133403cf6c9fSGreg Banks err = seq_open(file, &svc_pool_stats_seq_ops); 133503cf6c9fSGreg Banks if (!err) 133603cf6c9fSGreg Banks ((struct seq_file *) file->private_data)->private = serv; 133703cf6c9fSGreg Banks return err; 133803cf6c9fSGreg Banks } 133903cf6c9fSGreg Banks EXPORT_SYMBOL(svc_pool_stats_open); 134003cf6c9fSGreg Banks 134103cf6c9fSGreg Banks /*----------------------------------------------------------------------------*/ 1342