1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21d8206b9STom Tucker /* 31d8206b9STom Tucker * linux/net/sunrpc/svc_xprt.c 41d8206b9STom Tucker * 51d8206b9STom Tucker * Author: Tom Tucker <tom@opengridcomputing.com> 61d8206b9STom Tucker */ 71d8206b9STom Tucker 81d8206b9STom Tucker #include <linux/sched.h> 94034247aSNeilBrown #include <linux/sched/mm.h> 101d8206b9STom Tucker #include <linux/errno.h> 111d8206b9STom Tucker #include <linux/freezer.h> 127086721fSJeff Layton #include <linux/kthread.h> 135a0e3ad6STejun Heo #include <linux/slab.h> 141d8206b9STom Tucker #include <net/sock.h> 15c3d4879eSScott Mayhew #include <linux/sunrpc/addr.h> 161d8206b9STom Tucker #include <linux/sunrpc/stats.h> 171d8206b9STom Tucker #include <linux/sunrpc/svc_xprt.h> 18dcf1a357SH Hartley Sweeten #include <linux/sunrpc/svcsock.h> 1999de8ea9SJ. Bruce Fields #include <linux/sunrpc/xprt.h> 203a9a231dSPaul Gortmaker #include <linux/module.h> 21c3d4879eSScott Mayhew #include <linux/netdevice.h> 22860a0d9eSJeff Layton #include <trace/events/sunrpc.h> 231d8206b9STom Tucker 241d8206b9STom Tucker #define RPCDBG_FACILITY RPCDBG_SVCXPRT 251d8206b9STom Tucker 26ff3ac5c3STrond Myklebust static unsigned int svc_rpc_per_connection_limit __read_mostly; 27ff3ac5c3STrond Myklebust module_param(svc_rpc_per_connection_limit, uint, 0644); 28ff3ac5c3STrond Myklebust 29ff3ac5c3STrond Myklebust 300f0257eaSTom Tucker static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt); 310f0257eaSTom Tucker static int svc_deferred_recv(struct svc_rqst *rqstp); 320f0257eaSTom Tucker static struct cache_deferred_req *svc_defer(struct cache_req *req); 33ff861c4dSKees Cook static void svc_age_temp_xprts(struct timer_list *t); 347710ec36SJ. Bruce Fields static void svc_delete_xprt(struct svc_xprt *xprt); 350f0257eaSTom Tucker 360f0257eaSTom Tucker /* apparently the "standard" is that clients close 370f0257eaSTom Tucker * idle connections after 5 minutes, servers after 380f0257eaSTom Tucker * 6 minutes 39855c9e76SJ. Bruce Fields * http://nfsv4bat.org/Documents/ConnectAThon/1996/nfstcp.pdf 400f0257eaSTom Tucker */ 410f0257eaSTom Tucker static int svc_conn_age_period = 6*60; 420f0257eaSTom Tucker 431d8206b9STom Tucker /* List of registered transport classes */ 441d8206b9STom Tucker static DEFINE_SPINLOCK(svc_xprt_class_lock); 451d8206b9STom Tucker static LIST_HEAD(svc_xprt_class_list); 461d8206b9STom Tucker 470f0257eaSTom Tucker /* SMP locking strategy: 480f0257eaSTom Tucker * 490f0257eaSTom Tucker * svc_pool->sp_lock protects most of the fields of that pool. 500f0257eaSTom Tucker * svc_serv->sv_lock protects sv_tempsocks, sv_permsocks, sv_tmpcnt. 510f0257eaSTom Tucker * when both need to be taken (rare), svc_serv->sv_lock is first. 523c519914SJeff Layton * The "service mutex" protects svc_serv->sv_nrthread. 530f0257eaSTom Tucker * svc_sock->sk_lock protects the svc_sock->sk_deferred list 540f0257eaSTom Tucker * and the ->sk_info_authunix cache. 550f0257eaSTom Tucker * 560f0257eaSTom Tucker * The XPT_BUSY bit in xprt->xpt_flags prevents a transport being 570f0257eaSTom Tucker * enqueued multiply. During normal transport processing this bit 580f0257eaSTom Tucker * is set by svc_xprt_enqueue and cleared by svc_xprt_received. 590f0257eaSTom Tucker * Providers should not manipulate this bit directly. 600f0257eaSTom Tucker * 610f0257eaSTom Tucker * Some flags can be set to certain values at any time 620f0257eaSTom Tucker * providing that certain rules are followed: 630f0257eaSTom Tucker * 640f0257eaSTom Tucker * XPT_CONN, XPT_DATA: 650f0257eaSTom Tucker * - Can be set or cleared at any time. 660f0257eaSTom Tucker * - After a set, svc_xprt_enqueue must be called to enqueue 670f0257eaSTom Tucker * the transport for processing. 680f0257eaSTom Tucker * - After a clear, the transport must be read/accepted. 690f0257eaSTom Tucker * If this succeeds, it must be set again. 700f0257eaSTom Tucker * XPT_CLOSE: 710f0257eaSTom Tucker * - Can set at any time. It is never cleared. 720f0257eaSTom Tucker * XPT_DEAD: 730f0257eaSTom Tucker * - Can only be set while XPT_BUSY is held which ensures 740f0257eaSTom Tucker * that no other thread will be using the transport or will 750f0257eaSTom Tucker * try to set XPT_DEAD. 760f0257eaSTom Tucker */ 771d8206b9STom Tucker int svc_reg_xprt_class(struct svc_xprt_class *xcl) 781d8206b9STom Tucker { 791d8206b9STom Tucker struct svc_xprt_class *cl; 801d8206b9STom Tucker int res = -EEXIST; 811d8206b9STom Tucker 821d8206b9STom Tucker dprintk("svc: Adding svc transport class '%s'\n", xcl->xcl_name); 831d8206b9STom Tucker 841d8206b9STom Tucker INIT_LIST_HEAD(&xcl->xcl_list); 851d8206b9STom Tucker spin_lock(&svc_xprt_class_lock); 861d8206b9STom Tucker /* Make sure there isn't already a class with the same name */ 871d8206b9STom Tucker list_for_each_entry(cl, &svc_xprt_class_list, xcl_list) { 881d8206b9STom Tucker if (strcmp(xcl->xcl_name, cl->xcl_name) == 0) 891d8206b9STom Tucker goto out; 901d8206b9STom Tucker } 911d8206b9STom Tucker list_add_tail(&xcl->xcl_list, &svc_xprt_class_list); 921d8206b9STom Tucker res = 0; 931d8206b9STom Tucker out: 941d8206b9STom Tucker spin_unlock(&svc_xprt_class_lock); 951d8206b9STom Tucker return res; 961d8206b9STom Tucker } 971d8206b9STom Tucker EXPORT_SYMBOL_GPL(svc_reg_xprt_class); 981d8206b9STom Tucker 991d8206b9STom Tucker void svc_unreg_xprt_class(struct svc_xprt_class *xcl) 1001d8206b9STom Tucker { 1011d8206b9STom Tucker dprintk("svc: Removing svc transport class '%s'\n", xcl->xcl_name); 1021d8206b9STom Tucker spin_lock(&svc_xprt_class_lock); 1031d8206b9STom Tucker list_del_init(&xcl->xcl_list); 1041d8206b9STom Tucker spin_unlock(&svc_xprt_class_lock); 1051d8206b9STom Tucker } 1061d8206b9STom Tucker EXPORT_SYMBOL_GPL(svc_unreg_xprt_class); 1071d8206b9STom Tucker 108b25b60d7SChristophe JAILLET /** 109b25b60d7SChristophe JAILLET * svc_print_xprts - Format the transport list for printing 110b25b60d7SChristophe JAILLET * @buf: target buffer for formatted address 111b25b60d7SChristophe JAILLET * @maxlen: length of target buffer 112b25b60d7SChristophe JAILLET * 113b25b60d7SChristophe JAILLET * Fills in @buf with a string containing a list of transport names, each name 114b25b60d7SChristophe JAILLET * terminated with '\n'. If the buffer is too small, some entries may be 115b25b60d7SChristophe JAILLET * missing, but it is guaranteed that all lines in the output buffer are 116b25b60d7SChristophe JAILLET * complete. 117b25b60d7SChristophe JAILLET * 118b25b60d7SChristophe JAILLET * Returns positive length of the filled-in string. 119dc9a16e4STom Tucker */ 120dc9a16e4STom Tucker int svc_print_xprts(char *buf, int maxlen) 121dc9a16e4STom Tucker { 1228f3a6de3SPavel Emelyanov struct svc_xprt_class *xcl; 123dc9a16e4STom Tucker char tmpstr[80]; 124dc9a16e4STom Tucker int len = 0; 125dc9a16e4STom Tucker buf[0] = '\0'; 126dc9a16e4STom Tucker 127dc9a16e4STom Tucker spin_lock(&svc_xprt_class_lock); 1288f3a6de3SPavel Emelyanov list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) { 129dc9a16e4STom Tucker int slen; 130dc9a16e4STom Tucker 131b25b60d7SChristophe JAILLET slen = snprintf(tmpstr, sizeof(tmpstr), "%s %d\n", 132b25b60d7SChristophe JAILLET xcl->xcl_name, xcl->xcl_max_payload); 133b25b60d7SChristophe JAILLET if (slen >= sizeof(tmpstr) || len + slen >= maxlen) 134dc9a16e4STom Tucker break; 135dc9a16e4STom Tucker len += slen; 136dc9a16e4STom Tucker strcat(buf, tmpstr); 137dc9a16e4STom Tucker } 138dc9a16e4STom Tucker spin_unlock(&svc_xprt_class_lock); 139dc9a16e4STom Tucker 140dc9a16e4STom Tucker return len; 141dc9a16e4STom Tucker } 142dc9a16e4STom Tucker 143e844d307SChuck Lever /** 144e844d307SChuck Lever * svc_xprt_deferred_close - Close a transport 145e844d307SChuck Lever * @xprt: transport instance 146e844d307SChuck Lever * 147e844d307SChuck Lever * Used in contexts that need to defer the work of shutting down 148e844d307SChuck Lever * the transport to an nfsd thread. 149e844d307SChuck Lever */ 150e844d307SChuck Lever void svc_xprt_deferred_close(struct svc_xprt *xprt) 151e844d307SChuck Lever { 152e844d307SChuck Lever if (!test_and_set_bit(XPT_CLOSE, &xprt->xpt_flags)) 153e844d307SChuck Lever svc_xprt_enqueue(xprt); 154e844d307SChuck Lever } 155e844d307SChuck Lever EXPORT_SYMBOL_GPL(svc_xprt_deferred_close); 156e844d307SChuck Lever 157e1b3157fSTom Tucker static void svc_xprt_free(struct kref *kref) 158e1b3157fSTom Tucker { 159e1b3157fSTom Tucker struct svc_xprt *xprt = 160e1b3157fSTom Tucker container_of(kref, struct svc_xprt, xpt_ref); 161e1b3157fSTom Tucker struct module *owner = xprt->xpt_class->xcl_owner; 162e3bfca01SPavel Emelyanov if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) 163e3bfca01SPavel Emelyanov svcauth_unix_info_release(xprt); 1644df493a2STrond Myklebust put_cred(xprt->xpt_cred); 1656cdef8a6SEric Dumazet put_net_track(xprt->xpt_net, &xprt->ns_tracker); 16699de8ea9SJ. Bruce Fields /* See comment on corresponding get in xs_setup_bc_tcp(): */ 16799de8ea9SJ. Bruce Fields if (xprt->xpt_bc_xprt) 16899de8ea9SJ. Bruce Fields xprt_put(xprt->xpt_bc_xprt); 16939a9beabSJ. Bruce Fields if (xprt->xpt_bc_xps) 17039a9beabSJ. Bruce Fields xprt_switch_put(xprt->xpt_bc_xps); 17111bbb0f7SChuck Lever trace_svc_xprt_free(xprt); 172e1b3157fSTom Tucker xprt->xpt_ops->xpo_free(xprt); 173e1b3157fSTom Tucker module_put(owner); 174e1b3157fSTom Tucker } 175e1b3157fSTom Tucker 176e1b3157fSTom Tucker void svc_xprt_put(struct svc_xprt *xprt) 177e1b3157fSTom Tucker { 178e1b3157fSTom Tucker kref_put(&xprt->xpt_ref, svc_xprt_free); 179e1b3157fSTom Tucker } 180e1b3157fSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_put); 181e1b3157fSTom Tucker 1821d8206b9STom Tucker /* 1831d8206b9STom Tucker * Called by transport drivers to initialize the transport independent 1841d8206b9STom Tucker * portion of the transport instance. 1851d8206b9STom Tucker */ 186bd4620ddSStanislav Kinsbursky void svc_xprt_init(struct net *net, struct svc_xprt_class *xcl, 187bd4620ddSStanislav Kinsbursky struct svc_xprt *xprt, struct svc_serv *serv) 1881d8206b9STom Tucker { 1891d8206b9STom Tucker memset(xprt, 0, sizeof(*xprt)); 1901d8206b9STom Tucker xprt->xpt_class = xcl; 1911d8206b9STom Tucker xprt->xpt_ops = xcl->xcl_ops; 192e1b3157fSTom Tucker kref_init(&xprt->xpt_ref); 193bb5cf160STom Tucker xprt->xpt_server = serv; 1947a182083STom Tucker INIT_LIST_HEAD(&xprt->xpt_list); 1957a182083STom Tucker INIT_LIST_HEAD(&xprt->xpt_ready); 1968c7b0172STom Tucker INIT_LIST_HEAD(&xprt->xpt_deferred); 197edc7a894SJ. Bruce Fields INIT_LIST_HEAD(&xprt->xpt_users); 198a50fea26STom Tucker mutex_init(&xprt->xpt_mutex); 199def13d74STom Tucker spin_lock_init(&xprt->xpt_lock); 2004e5caaa5STom Tucker set_bit(XPT_BUSY, &xprt->xpt_flags); 2016cdef8a6SEric Dumazet xprt->xpt_net = get_net_track(net, &xprt->ns_tracker, GFP_ATOMIC); 202ece200ddSChuck Lever strcpy(xprt->xpt_remotebuf, "uninitialized"); 2031d8206b9STom Tucker } 2041d8206b9STom Tucker EXPORT_SYMBOL_GPL(svc_xprt_init); 205b700cbb1STom Tucker 2065dd248f6SChuck Lever static struct svc_xprt *__svc_xpo_create(struct svc_xprt_class *xcl, 2075dd248f6SChuck Lever struct svc_serv *serv, 20862832c03SPavel Emelyanov struct net *net, 2099652ada3SChuck Lever const int family, 2109652ada3SChuck Lever const unsigned short port, 2119652ada3SChuck Lever int flags) 212b700cbb1STom Tucker { 213b700cbb1STom Tucker struct sockaddr_in sin = { 214b700cbb1STom Tucker .sin_family = AF_INET, 215e6f1cebfSAl Viro .sin_addr.s_addr = htonl(INADDR_ANY), 216b700cbb1STom Tucker .sin_port = htons(port), 217b700cbb1STom Tucker }; 218dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 2195dd248f6SChuck Lever struct sockaddr_in6 sin6 = { 2205dd248f6SChuck Lever .sin6_family = AF_INET6, 2215dd248f6SChuck Lever .sin6_addr = IN6ADDR_ANY_INIT, 2225dd248f6SChuck Lever .sin6_port = htons(port), 2235dd248f6SChuck Lever }; 224dfd56b8bSEric Dumazet #endif 2254b8f380eSChuck Lever struct svc_xprt *xprt; 2265dd248f6SChuck Lever struct sockaddr *sap; 2275dd248f6SChuck Lever size_t len; 2285dd248f6SChuck Lever 2299652ada3SChuck Lever switch (family) { 2309652ada3SChuck Lever case PF_INET: 2315dd248f6SChuck Lever sap = (struct sockaddr *)&sin; 2325dd248f6SChuck Lever len = sizeof(sin); 2335dd248f6SChuck Lever break; 234dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 2359652ada3SChuck Lever case PF_INET6: 2365dd248f6SChuck Lever sap = (struct sockaddr *)&sin6; 2375dd248f6SChuck Lever len = sizeof(sin6); 2385dd248f6SChuck Lever break; 239dfd56b8bSEric Dumazet #endif 2405dd248f6SChuck Lever default: 2415dd248f6SChuck Lever return ERR_PTR(-EAFNOSUPPORT); 2425dd248f6SChuck Lever } 2435dd248f6SChuck Lever 2444b8f380eSChuck Lever xprt = xcl->xcl_ops->xpo_create(serv, net, sap, len, flags); 2454b8f380eSChuck Lever if (IS_ERR(xprt)) 2464b8f380eSChuck Lever trace_svc_xprt_create_err(serv->sv_program->pg_name, 247dc6c6fb3SChuck Lever xcl->xcl_name, sap, len, xprt); 2484b8f380eSChuck Lever return xprt; 2495dd248f6SChuck Lever } 2505dd248f6SChuck Lever 2517dcfbd86SChuck Lever /** 2527dcfbd86SChuck Lever * svc_xprt_received - start next receiver thread 2537dcfbd86SChuck Lever * @xprt: controlling transport 2547dcfbd86SChuck Lever * 2557dcfbd86SChuck Lever * The caller must hold the XPT_BUSY bit and must 2566741019cSJ. Bruce Fields * not thereafter touch transport data. 2576741019cSJ. Bruce Fields * 2586741019cSJ. Bruce Fields * Note: XPT_DATA only gets cleared when a read-attempt finds no (or 2596741019cSJ. Bruce Fields * insufficient) data. 2606741019cSJ. Bruce Fields */ 2617dcfbd86SChuck Lever void svc_xprt_received(struct svc_xprt *xprt) 2626741019cSJ. Bruce Fields { 263acf06a7fSJeff Layton if (!test_bit(XPT_BUSY, &xprt->xpt_flags)) { 264acf06a7fSJeff Layton WARN_ONCE(1, "xprt=0x%p already busy!", xprt); 265ff1fdb9bSWeston Andros Adamson return; 266acf06a7fSJeff Layton } 267acf06a7fSJeff Layton 2686741019cSJ. Bruce Fields /* As soon as we clear busy, the xprt could be closed and 269c0219c49SChuck Lever * 'put', so we need a reference to call svc_xprt_enqueue with: 2706741019cSJ. Bruce Fields */ 2716741019cSJ. Bruce Fields svc_xprt_get(xprt); 2720971374eSTrond Myklebust smp_mb__before_atomic(); 2736741019cSJ. Bruce Fields clear_bit(XPT_BUSY, &xprt->xpt_flags); 274c0219c49SChuck Lever svc_xprt_enqueue(xprt); 2756741019cSJ. Bruce Fields svc_xprt_put(xprt); 2766741019cSJ. Bruce Fields } 2777dcfbd86SChuck Lever EXPORT_SYMBOL_GPL(svc_xprt_received); 2786741019cSJ. Bruce Fields 27939b55301SJ. Bruce Fields void svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *new) 28039b55301SJ. Bruce Fields { 28139b55301SJ. Bruce Fields clear_bit(XPT_TEMP, &new->xpt_flags); 28239b55301SJ. Bruce Fields spin_lock_bh(&serv->sv_lock); 28339b55301SJ. Bruce Fields list_add(&new->xpt_list, &serv->sv_permsocks); 28439b55301SJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 28539b55301SJ. Bruce Fields svc_xprt_received(new); 28639b55301SJ. Bruce Fields } 28739b55301SJ. Bruce Fields 288352ad314SChuck Lever static int _svc_xprt_create(struct svc_serv *serv, const char *xprt_name, 289fc5d00b0SPavel Emelyanov struct net *net, const int family, 2904df493a2STrond Myklebust const unsigned short port, int flags, 2914df493a2STrond Myklebust const struct cred *cred) 2925dd248f6SChuck Lever { 2935dd248f6SChuck Lever struct svc_xprt_class *xcl; 2945dd248f6SChuck Lever 295b700cbb1STom Tucker spin_lock(&svc_xprt_class_lock); 296b700cbb1STom Tucker list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) { 297b700cbb1STom Tucker struct svc_xprt *newxprt; 298ed2849d3SNeilBrown unsigned short newport; 2994e5caaa5STom Tucker 3004e5caaa5STom Tucker if (strcmp(xprt_name, xcl->xcl_name)) 3014e5caaa5STom Tucker continue; 3024e5caaa5STom Tucker 3034e5caaa5STom Tucker if (!try_module_get(xcl->xcl_owner)) 3044e5caaa5STom Tucker goto err; 3054e5caaa5STom Tucker 3064e5caaa5STom Tucker spin_unlock(&svc_xprt_class_lock); 30762832c03SPavel Emelyanov newxprt = __svc_xpo_create(xcl, serv, net, family, port, flags); 308b700cbb1STom Tucker if (IS_ERR(newxprt)) { 309b700cbb1STom Tucker module_put(xcl->xcl_owner); 3104e5caaa5STom Tucker return PTR_ERR(newxprt); 311b700cbb1STom Tucker } 3124df493a2STrond Myklebust newxprt->xpt_cred = get_cred(cred); 31339b55301SJ. Bruce Fields svc_add_new_perm_xprt(serv, newxprt); 314ed2849d3SNeilBrown newport = svc_xprt_local_port(newxprt); 315ed2849d3SNeilBrown return newport; 316b700cbb1STom Tucker } 3174e5caaa5STom Tucker err: 318b700cbb1STom Tucker spin_unlock(&svc_xprt_class_lock); 31968717908SChuck Lever /* This errno is exposed to user space. Provide a reasonable 32068717908SChuck Lever * perror msg for a bad transport. */ 32168717908SChuck Lever return -EPROTONOSUPPORT; 322b700cbb1STom Tucker } 323d96b9c93SJ. Bruce Fields 324352ad314SChuck Lever /** 325352ad314SChuck Lever * svc_xprt_create - Add a new listener to @serv 326352ad314SChuck Lever * @serv: target RPC service 327352ad314SChuck Lever * @xprt_name: transport class name 328352ad314SChuck Lever * @net: network namespace 329352ad314SChuck Lever * @family: network address family 330352ad314SChuck Lever * @port: listener port 331352ad314SChuck Lever * @flags: SVC_SOCK flags 332352ad314SChuck Lever * @cred: credential to bind to this transport 333352ad314SChuck Lever * 334352ad314SChuck Lever * Return values: 335352ad314SChuck Lever * %0: New listener added successfully 336352ad314SChuck Lever * %-EPROTONOSUPPORT: Requested transport type not supported 337352ad314SChuck Lever */ 338352ad314SChuck Lever int svc_xprt_create(struct svc_serv *serv, const char *xprt_name, 339d96b9c93SJ. Bruce Fields struct net *net, const int family, 3404df493a2STrond Myklebust const unsigned short port, int flags, 3414df493a2STrond Myklebust const struct cred *cred) 342d96b9c93SJ. Bruce Fields { 343d96b9c93SJ. Bruce Fields int err; 344d96b9c93SJ. Bruce Fields 345352ad314SChuck Lever err = _svc_xprt_create(serv, xprt_name, net, family, port, flags, cred); 346d96b9c93SJ. Bruce Fields if (err == -EPROTONOSUPPORT) { 347d96b9c93SJ. Bruce Fields request_module("svc%s", xprt_name); 348352ad314SChuck Lever err = _svc_xprt_create(serv, xprt_name, net, family, port, flags, cred); 349d96b9c93SJ. Bruce Fields } 350d96b9c93SJ. Bruce Fields return err; 351d96b9c93SJ. Bruce Fields } 352352ad314SChuck Lever EXPORT_SYMBOL_GPL(svc_xprt_create); 3539dbc240fSTom Tucker 3549dbc240fSTom Tucker /* 3559dbc240fSTom Tucker * Copy the local and remote xprt addresses to the rqstp structure 3569dbc240fSTom Tucker */ 3579dbc240fSTom Tucker void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt) 3589dbc240fSTom Tucker { 3599dbc240fSTom Tucker memcpy(&rqstp->rq_addr, &xprt->xpt_remote, xprt->xpt_remotelen); 3609dbc240fSTom Tucker rqstp->rq_addrlen = xprt->xpt_remotelen; 3619dbc240fSTom Tucker 3629dbc240fSTom Tucker /* 3639dbc240fSTom Tucker * Destination address in request is needed for binding the 3649dbc240fSTom Tucker * source address in RPC replies/callbacks later. 3659dbc240fSTom Tucker */ 366849a1cf1SMi Jinlong memcpy(&rqstp->rq_daddr, &xprt->xpt_local, xprt->xpt_locallen); 367849a1cf1SMi Jinlong rqstp->rq_daddrlen = xprt->xpt_locallen; 3689dbc240fSTom Tucker } 3699dbc240fSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs); 3709dbc240fSTom Tucker 3710f0257eaSTom Tucker /** 3720f0257eaSTom Tucker * svc_print_addr - Format rq_addr field for printing 3730f0257eaSTom Tucker * @rqstp: svc_rqst struct containing address to print 3740f0257eaSTom Tucker * @buf: target buffer for formatted address 3750f0257eaSTom Tucker * @len: length of target buffer 3760f0257eaSTom Tucker * 3770f0257eaSTom Tucker */ 3780f0257eaSTom Tucker char *svc_print_addr(struct svc_rqst *rqstp, char *buf, size_t len) 3790f0257eaSTom Tucker { 3800f0257eaSTom Tucker return __svc_print_addr(svc_addr(rqstp), buf, len); 3810f0257eaSTom Tucker } 3820f0257eaSTom Tucker EXPORT_SYMBOL_GPL(svc_print_addr); 3830f0257eaSTom Tucker 384ff3ac5c3STrond Myklebust static bool svc_xprt_slots_in_range(struct svc_xprt *xprt) 385ff3ac5c3STrond Myklebust { 386ff3ac5c3STrond Myklebust unsigned int limit = svc_rpc_per_connection_limit; 387ff3ac5c3STrond Myklebust int nrqsts = atomic_read(&xprt->xpt_nr_rqsts); 388ff3ac5c3STrond Myklebust 389ff3ac5c3STrond Myklebust return limit == 0 || (nrqsts >= 0 && nrqsts < limit); 390ff3ac5c3STrond Myklebust } 391ff3ac5c3STrond Myklebust 392ff3ac5c3STrond Myklebust static bool svc_xprt_reserve_slot(struct svc_rqst *rqstp, struct svc_xprt *xprt) 393ff3ac5c3STrond Myklebust { 394ff3ac5c3STrond Myklebust if (!test_bit(RQ_DATA, &rqstp->rq_flags)) { 395ff3ac5c3STrond Myklebust if (!svc_xprt_slots_in_range(xprt)) 396ff3ac5c3STrond Myklebust return false; 397ff3ac5c3STrond Myklebust atomic_inc(&xprt->xpt_nr_rqsts); 398ff3ac5c3STrond Myklebust set_bit(RQ_DATA, &rqstp->rq_flags); 399ff3ac5c3STrond Myklebust } 400ff3ac5c3STrond Myklebust return true; 401ff3ac5c3STrond Myklebust } 402ff3ac5c3STrond Myklebust 403ff3ac5c3STrond Myklebust static void svc_xprt_release_slot(struct svc_rqst *rqstp) 404ff3ac5c3STrond Myklebust { 405ff3ac5c3STrond Myklebust struct svc_xprt *xprt = rqstp->rq_xprt; 406ff3ac5c3STrond Myklebust if (test_and_clear_bit(RQ_DATA, &rqstp->rq_flags)) { 407ff3ac5c3STrond Myklebust atomic_dec(&xprt->xpt_nr_rqsts); 40895503d29SJ. Bruce Fields smp_wmb(); /* See smp_rmb() in svc_xprt_ready() */ 409ff3ac5c3STrond Myklebust svc_xprt_enqueue(xprt); 410ff3ac5c3STrond Myklebust } 411ff3ac5c3STrond Myklebust } 412ff3ac5c3STrond Myklebust 41366c898caSJ. Bruce Fields static bool svc_xprt_ready(struct svc_xprt *xprt) 4149c335c0bSJ. Bruce Fields { 4151602a7b7STrond Myklebust unsigned long xpt_flags; 4161602a7b7STrond Myklebust 41795503d29SJ. Bruce Fields /* 41895503d29SJ. Bruce Fields * If another cpu has recently updated xpt_flags, 41995503d29SJ. Bruce Fields * sk_sock->flags, xpt_reserved, or xpt_nr_rqsts, we need to 42095503d29SJ. Bruce Fields * know about it; otherwise it's possible that both that cpu and 42195503d29SJ. Bruce Fields * this one could call svc_xprt_enqueue() without either 42295503d29SJ. Bruce Fields * svc_xprt_enqueue() recognizing that the conditions below 42395503d29SJ. Bruce Fields * are satisfied, and we could stall indefinitely: 42495503d29SJ. Bruce Fields */ 42595503d29SJ. Bruce Fields smp_rmb(); 4261602a7b7STrond Myklebust xpt_flags = READ_ONCE(xprt->xpt_flags); 4271602a7b7STrond Myklebust 428c0219c49SChuck Lever if (xpt_flags & BIT(XPT_BUSY)) 429c0219c49SChuck Lever return false; 430*b3cbf98eSChuck Lever if (xpt_flags & (BIT(XPT_CONN) | BIT(XPT_CLOSE) | BIT(XPT_HANDSHAKE))) 4319c335c0bSJ. Bruce Fields return true; 4321602a7b7STrond Myklebust if (xpt_flags & (BIT(XPT_DATA) | BIT(XPT_DEFERRED))) { 433ff3ac5c3STrond Myklebust if (xprt->xpt_ops->xpo_has_wspace(xprt) && 434ff3ac5c3STrond Myklebust svc_xprt_slots_in_range(xprt)) 43582ea2d76STrond Myklebust return true; 43682ea2d76STrond Myklebust trace_svc_xprt_no_write_space(xprt); 43782ea2d76STrond Myklebust return false; 43882ea2d76STrond Myklebust } 4399c335c0bSJ. Bruce Fields return false; 4409c335c0bSJ. Bruce Fields } 4419c335c0bSJ. Bruce Fields 442c0219c49SChuck Lever /** 443c0219c49SChuck Lever * svc_xprt_enqueue - Queue a transport on an idle nfsd thread 444c0219c49SChuck Lever * @xprt: transport with data pending 445c0219c49SChuck Lever * 446c0219c49SChuck Lever */ 447c0219c49SChuck Lever void svc_xprt_enqueue(struct svc_xprt *xprt) 4480f0257eaSTom Tucker { 4490f0257eaSTom Tucker struct svc_pool *pool; 45083a712e0SJeff Layton struct svc_rqst *rqstp = NULL; 4510f0257eaSTom Tucker 45266c898caSJ. Bruce Fields if (!svc_xprt_ready(xprt)) 4537dbb53baSChuck Lever return; 4540f0257eaSTom Tucker 4550f0257eaSTom Tucker /* Mark transport as busy. It will remain in this state until 4560f0257eaSTom Tucker * the provider calls svc_xprt_received. We update XPT_BUSY 4570f0257eaSTom Tucker * atomically because it also guards against trying to enqueue 4580f0257eaSTom Tucker * the transport twice. 4590f0257eaSTom Tucker */ 4607dbb53baSChuck Lever if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) 4617dbb53baSChuck Lever return; 4620f0257eaSTom Tucker 4632059b698SChuck Lever pool = svc_pool_for_cpu(xprt->xpt_server); 4640c0746d0STrond Myklebust 465ccf08bedSChuck Lever percpu_counter_inc(&pool->sp_sockets_queued); 466b1691bc0SJeff Layton spin_lock_bh(&pool->sp_lock); 467b1691bc0SJeff Layton list_add_tail(&xprt->xpt_ready, &pool->sp_sockets); 4680f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 46922700f3cSTrond Myklebust 47022700f3cSTrond Myklebust /* find a thread for this xprt */ 47122700f3cSTrond Myklebust rcu_read_lock(); 47222700f3cSTrond Myklebust list_for_each_entry_rcu(rqstp, &pool->sp_all_threads, rq_all) { 47322700f3cSTrond Myklebust if (test_and_set_bit(RQ_BUSY, &rqstp->rq_flags)) 47422700f3cSTrond Myklebust continue; 475ccf08bedSChuck Lever percpu_counter_inc(&pool->sp_threads_woken); 47655f5088cSChuck Lever rqstp->rq_qtime = ktime_get(); 47722700f3cSTrond Myklebust wake_up_process(rqstp->rq_task); 47822700f3cSTrond Myklebust goto out_unlock; 479b1691bc0SJeff Layton } 48022700f3cSTrond Myklebust set_bit(SP_CONGESTED, &pool->sp_flags); 48183a712e0SJeff Layton rqstp = NULL; 48222700f3cSTrond Myklebust out_unlock: 48322700f3cSTrond Myklebust rcu_read_unlock(); 4845089f3d9SChuck Lever trace_svc_xprt_enqueue(xprt, rqstp); 4850f0257eaSTom Tucker } 4860f0257eaSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_enqueue); 4870f0257eaSTom Tucker 4880f0257eaSTom Tucker /* 489b1691bc0SJeff Layton * Dequeue the first transport, if there is one. 4900f0257eaSTom Tucker */ 4910f0257eaSTom Tucker static struct svc_xprt *svc_xprt_dequeue(struct svc_pool *pool) 4920f0257eaSTom Tucker { 493b1691bc0SJeff Layton struct svc_xprt *xprt = NULL; 4940f0257eaSTom Tucker 4950f0257eaSTom Tucker if (list_empty(&pool->sp_sockets)) 49683a712e0SJeff Layton goto out; 4970f0257eaSTom Tucker 498b1691bc0SJeff Layton spin_lock_bh(&pool->sp_lock); 499b1691bc0SJeff Layton if (likely(!list_empty(&pool->sp_sockets))) { 500b1691bc0SJeff Layton xprt = list_first_entry(&pool->sp_sockets, 5010f0257eaSTom Tucker struct svc_xprt, xpt_ready); 5020f0257eaSTom Tucker list_del_init(&xprt->xpt_ready); 503b1691bc0SJeff Layton svc_xprt_get(xprt); 504b1691bc0SJeff Layton } 505b1691bc0SJeff Layton spin_unlock_bh(&pool->sp_lock); 50683a712e0SJeff Layton out: 5070f0257eaSTom Tucker return xprt; 5080f0257eaSTom Tucker } 5090f0257eaSTom Tucker 5100f0257eaSTom Tucker /** 5110f0257eaSTom Tucker * svc_reserve - change the space reserved for the reply to a request. 5120f0257eaSTom Tucker * @rqstp: The request in question 5130f0257eaSTom Tucker * @space: new max space to reserve 5140f0257eaSTom Tucker * 5150f0257eaSTom Tucker * Each request reserves some space on the output queue of the transport 5160f0257eaSTom Tucker * to make sure the reply fits. This function reduces that reserved 5170f0257eaSTom Tucker * space to be the amount of space used already, plus @space. 5180f0257eaSTom Tucker * 5190f0257eaSTom Tucker */ 5200f0257eaSTom Tucker void svc_reserve(struct svc_rqst *rqstp, int space) 5210f0257eaSTom Tucker { 522d4b09acfSVasily Averin struct svc_xprt *xprt = rqstp->rq_xprt; 523d4b09acfSVasily Averin 5240f0257eaSTom Tucker space += rqstp->rq_res.head[0].iov_len; 5250f0257eaSTom Tucker 526d4b09acfSVasily Averin if (xprt && space < rqstp->rq_reserved) { 5270f0257eaSTom Tucker atomic_sub((rqstp->rq_reserved - space), &xprt->xpt_reserved); 5280f0257eaSTom Tucker rqstp->rq_reserved = space; 52995503d29SJ. Bruce Fields smp_wmb(); /* See smp_rmb() in svc_xprt_ready() */ 5300f0257eaSTom Tucker svc_xprt_enqueue(xprt); 5310f0257eaSTom Tucker } 5320f0257eaSTom Tucker } 53324c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_reserve); 5340f0257eaSTom Tucker 5350f0257eaSTom Tucker static void svc_xprt_release(struct svc_rqst *rqstp) 5360f0257eaSTom Tucker { 5370f0257eaSTom Tucker struct svc_xprt *xprt = rqstp->rq_xprt; 5380f0257eaSTom Tucker 53963a1b156SChuck Lever xprt->xpt_ops->xpo_release_rqst(rqstp); 5400f0257eaSTom Tucker 5412779e3aeSTom Tucker kfree(rqstp->rq_deferred); 5422779e3aeSTom Tucker rqstp->rq_deferred = NULL; 5432779e3aeSTom Tucker 544b20cb39dSChuck Lever svc_rqst_release_pages(rqstp); 5450f0257eaSTom Tucker rqstp->rq_res.page_len = 0; 5460f0257eaSTom Tucker rqstp->rq_res.page_base = 0; 5470f0257eaSTom Tucker 5480f0257eaSTom Tucker /* Reset response buffer and release 5490f0257eaSTom Tucker * the reservation. 5500f0257eaSTom Tucker * But first, check that enough space was reserved 5510f0257eaSTom Tucker * for the reply, otherwise we have a bug! 5520f0257eaSTom Tucker */ 5530f0257eaSTom Tucker if ((rqstp->rq_res.len) > rqstp->rq_reserved) 5540f0257eaSTom Tucker printk(KERN_ERR "RPC request reserved %d but used %d\n", 5550f0257eaSTom Tucker rqstp->rq_reserved, 5560f0257eaSTom Tucker rqstp->rq_res.len); 5570f0257eaSTom Tucker 5580f0257eaSTom Tucker rqstp->rq_res.head[0].iov_len = 0; 5590f0257eaSTom Tucker svc_reserve(rqstp, 0); 560ff3ac5c3STrond Myklebust svc_xprt_release_slot(rqstp); 5610f0257eaSTom Tucker rqstp->rq_xprt = NULL; 5620f0257eaSTom Tucker svc_xprt_put(xprt); 5630f0257eaSTom Tucker } 5640f0257eaSTom Tucker 5650f0257eaSTom Tucker /* 566ceff739cSJeff Layton * Some svc_serv's will have occasional work to do, even when a xprt is not 567ceff739cSJeff Layton * waiting to be serviced. This function is there to "kick" a task in one of 568ceff739cSJeff Layton * those services so that it can wake up and do that work. Note that we only 569ceff739cSJeff Layton * bother with pool 0 as we don't need to wake up more than one thread for 570ceff739cSJeff Layton * this purpose. 5710f0257eaSTom Tucker */ 5720f0257eaSTom Tucker void svc_wake_up(struct svc_serv *serv) 5730f0257eaSTom Tucker { 5740f0257eaSTom Tucker struct svc_rqst *rqstp; 5750f0257eaSTom Tucker struct svc_pool *pool; 5760f0257eaSTom Tucker 577ceff739cSJeff Layton pool = &serv->sv_pools[0]; 5780f0257eaSTom Tucker 579b1691bc0SJeff Layton rcu_read_lock(); 580b1691bc0SJeff Layton list_for_each_entry_rcu(rqstp, &pool->sp_all_threads, rq_all) { 581b1691bc0SJeff Layton /* skip any that aren't queued */ 582b1691bc0SJeff Layton if (test_bit(RQ_BUSY, &rqstp->rq_flags)) 583b1691bc0SJeff Layton continue; 584b1691bc0SJeff Layton rcu_read_unlock(); 585983c6844STrond Myklebust wake_up_process(rqstp->rq_task); 58683a712e0SJeff Layton trace_svc_wake_up(rqstp->rq_task->pid); 587b1691bc0SJeff Layton return; 588b1691bc0SJeff Layton } 589b1691bc0SJeff Layton rcu_read_unlock(); 590b1691bc0SJeff Layton 591b1691bc0SJeff Layton /* No free entries available */ 5924d5db3f5SJeff Layton set_bit(SP_TASK_PENDING, &pool->sp_flags); 593b1691bc0SJeff Layton smp_wmb(); 59483a712e0SJeff Layton trace_svc_wake_up(0); 5950f0257eaSTom Tucker } 59624c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_wake_up); 5970f0257eaSTom Tucker 5980f0257eaSTom Tucker int svc_port_is_privileged(struct sockaddr *sin) 5990f0257eaSTom Tucker { 6000f0257eaSTom Tucker switch (sin->sa_family) { 6010f0257eaSTom Tucker case AF_INET: 6020f0257eaSTom Tucker return ntohs(((struct sockaddr_in *)sin)->sin_port) 6030f0257eaSTom Tucker < PROT_SOCK; 6040f0257eaSTom Tucker case AF_INET6: 6050f0257eaSTom Tucker return ntohs(((struct sockaddr_in6 *)sin)->sin6_port) 6060f0257eaSTom Tucker < PROT_SOCK; 6070f0257eaSTom Tucker default: 6080f0257eaSTom Tucker return 0; 6090f0257eaSTom Tucker } 6100f0257eaSTom Tucker } 6110f0257eaSTom Tucker 6120f0257eaSTom Tucker /* 613c9233eb7SJeff Layton * Make sure that we don't have too many active connections. If we have, 614c9233eb7SJeff Layton * something must be dropped. It's not clear what will happen if we allow 615c9233eb7SJeff Layton * "too many" connections, but when dealing with network-facing software, 616c9233eb7SJeff Layton * we have to code defensively. Here we do that by imposing hard limits. 6170f0257eaSTom Tucker * 6180f0257eaSTom Tucker * There's no point in trying to do random drop here for DoS 6190f0257eaSTom Tucker * prevention. The NFS clients does 1 reconnect in 15 seconds. An 6200f0257eaSTom Tucker * attacker can easily beat that. 6210f0257eaSTom Tucker * 6220f0257eaSTom Tucker * The only somewhat efficient mechanism would be if drop old 6230f0257eaSTom Tucker * connections from the same IP first. But right now we don't even 6240f0257eaSTom Tucker * record the client IP in svc_sock. 625c9233eb7SJeff Layton * 626c9233eb7SJeff Layton * single-threaded services that expect a lot of clients will probably 627c9233eb7SJeff Layton * need to set sv_maxconn to override the default value which is based 628c9233eb7SJeff Layton * on the number of threads 6290f0257eaSTom Tucker */ 6300f0257eaSTom Tucker static void svc_check_conn_limits(struct svc_serv *serv) 6310f0257eaSTom Tucker { 632c9233eb7SJeff Layton unsigned int limit = serv->sv_maxconn ? serv->sv_maxconn : 633c9233eb7SJeff Layton (serv->sv_nrthreads+3) * 20; 634c9233eb7SJeff Layton 635c9233eb7SJeff Layton if (serv->sv_tmpcnt > limit) { 6360f0257eaSTom Tucker struct svc_xprt *xprt = NULL; 6370f0257eaSTom Tucker spin_lock_bh(&serv->sv_lock); 6380f0257eaSTom Tucker if (!list_empty(&serv->sv_tempsocks)) { 6390f0257eaSTom Tucker /* Try to help the admin */ 640e87cc472SJoe Perches net_notice_ratelimited("%s: too many open connections, consider increasing the %s\n", 641c9233eb7SJeff Layton serv->sv_name, serv->sv_maxconn ? 642e87cc472SJoe Perches "max number of connections" : 643e87cc472SJoe Perches "number of threads"); 6440f0257eaSTom Tucker /* 6450f0257eaSTom Tucker * Always select the oldest connection. It's not fair, 6460f0257eaSTom Tucker * but so is life 6470f0257eaSTom Tucker */ 6480f0257eaSTom Tucker xprt = list_entry(serv->sv_tempsocks.prev, 6490f0257eaSTom Tucker struct svc_xprt, 6500f0257eaSTom Tucker xpt_list); 6510f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 6520f0257eaSTom Tucker svc_xprt_get(xprt); 6530f0257eaSTom Tucker } 6540f0257eaSTom Tucker spin_unlock_bh(&serv->sv_lock); 6550f0257eaSTom Tucker 6560f0257eaSTom Tucker if (xprt) { 6570f0257eaSTom Tucker svc_xprt_enqueue(xprt); 6580f0257eaSTom Tucker svc_xprt_put(xprt); 6590f0257eaSTom Tucker } 6600f0257eaSTom Tucker } 6610f0257eaSTom Tucker } 6620f0257eaSTom Tucker 663e1d83ee6SRashika Kheria static int svc_alloc_arg(struct svc_rqst *rqstp) 6640f0257eaSTom Tucker { 6650f0257eaSTom Tucker struct svc_serv *serv = rqstp->rq_server; 666ab836264SChuck Lever struct xdr_buf *arg = &rqstp->rq_arg; 667e38b3f20SNeilBrown unsigned long pages, filled, ret; 6680f0257eaSTom Tucker 6698c6ae498SChuck Lever pages = (serv->sv_max_mesg + 2 * PAGE_SIZE) >> PAGE_SHIFT; 6708c6ae498SChuck Lever if (pages > RPCSVC_MAXPAGES) { 671f6e70aabSChuck Lever pr_warn_once("svc: warning: pages=%lu > RPCSVC_MAXPAGES=%lu\n", 6728c6ae498SChuck Lever pages, RPCSVC_MAXPAGES); 673b25cd058SWeston Andros Adamson /* use as many pages as possible */ 6748c6ae498SChuck Lever pages = RPCSVC_MAXPAGES; 6758c6ae498SChuck Lever } 676f6e70aabSChuck Lever 677e38b3f20SNeilBrown for (filled = 0; filled < pages; filled = ret) { 678e38b3f20SNeilBrown ret = alloc_pages_bulk_array(GFP_KERNEL, pages, 679f6e70aabSChuck Lever rqstp->rq_pages); 680e38b3f20SNeilBrown if (ret > filled) 681e38b3f20SNeilBrown /* Made progress, don't sleep yet */ 682e38b3f20SNeilBrown continue; 683f6e70aabSChuck Lever 6847b54fe61SJeff Layton set_current_state(TASK_INTERRUPTIBLE); 6857b54fe61SJeff Layton if (signalled() || kthread_should_stop()) { 6867b54fe61SJeff Layton set_current_state(TASK_RUNNING); 6877086721fSJeff Layton return -EINTR; 6887b54fe61SJeff Layton } 68928fffa6cSChuck Lever trace_svc_alloc_arg_err(pages, ret); 6904034247aSNeilBrown memalloc_retry_wait(GFP_KERNEL); 6910f0257eaSTom Tucker } 692ab836264SChuck Lever rqstp->rq_page_end = &rqstp->rq_pages[pages]; 693ab836264SChuck Lever rqstp->rq_pages[pages] = NULL; /* this might be seen in nfsd_splice_actor() */ 6940f0257eaSTom Tucker 6950f0257eaSTom Tucker /* Make arg->head point to first page and arg->pages point to rest */ 6960f0257eaSTom Tucker arg->head[0].iov_base = page_address(rqstp->rq_pages[0]); 6970f0257eaSTom Tucker arg->head[0].iov_len = PAGE_SIZE; 6980f0257eaSTom Tucker arg->pages = rqstp->rq_pages + 1; 6990f0257eaSTom Tucker arg->page_base = 0; 7000f0257eaSTom Tucker /* save at least one page for response */ 7010f0257eaSTom Tucker arg->page_len = (pages-2)*PAGE_SIZE; 7020f0257eaSTom Tucker arg->len = (pages-1)*PAGE_SIZE; 7030f0257eaSTom Tucker arg->tail[0].iov_len = 0; 704695bc1f3SChuck Lever 705695bc1f3SChuck Lever rqstp->rq_xid = xdr_zero; 7066797fa5aSJ. Bruce Fields return 0; 7076797fa5aSJ. Bruce Fields } 7080f0257eaSTom Tucker 709b1691bc0SJeff Layton static bool 710b1691bc0SJeff Layton rqst_should_sleep(struct svc_rqst *rqstp) 711b1691bc0SJeff Layton { 712b1691bc0SJeff Layton struct svc_pool *pool = rqstp->rq_pool; 713b1691bc0SJeff Layton 714b1691bc0SJeff Layton /* did someone call svc_wake_up? */ 715b1691bc0SJeff Layton if (test_and_clear_bit(SP_TASK_PENDING, &pool->sp_flags)) 716b1691bc0SJeff Layton return false; 717b1691bc0SJeff Layton 718b1691bc0SJeff Layton /* was a socket queued? */ 719b1691bc0SJeff Layton if (!list_empty(&pool->sp_sockets)) 720b1691bc0SJeff Layton return false; 721b1691bc0SJeff Layton 722b1691bc0SJeff Layton /* are we shutting down? */ 723b1691bc0SJeff Layton if (signalled() || kthread_should_stop()) 724b1691bc0SJeff Layton return false; 725b1691bc0SJeff Layton 726b1691bc0SJeff Layton /* are we freezing? */ 727b1691bc0SJeff Layton if (freezing(current)) 728b1691bc0SJeff Layton return false; 729b1691bc0SJeff Layton 730b1691bc0SJeff Layton return true; 731b1691bc0SJeff Layton } 732b1691bc0SJeff Layton 733e1d83ee6SRashika Kheria static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout) 7346797fa5aSJ. Bruce Fields { 7356797fa5aSJ. Bruce Fields struct svc_pool *pool = rqstp->rq_pool; 736a4aa8054STrond Myklebust long time_left = 0; 7370f0257eaSTom Tucker 738b1691bc0SJeff Layton /* rq_xprt should be clear on entry */ 739b1691bc0SJeff Layton WARN_ON_ONCE(rqstp->rq_xprt); 740b1691bc0SJeff Layton 74122700f3cSTrond Myklebust rqstp->rq_xprt = svc_xprt_dequeue(pool); 74222700f3cSTrond Myklebust if (rqstp->rq_xprt) 74322700f3cSTrond Myklebust goto out_found; 744b1691bc0SJeff Layton 7450f0257eaSTom Tucker /* 7460f0257eaSTom Tucker * We have to be able to interrupt this wait 7470f0257eaSTom Tucker * to bring down the daemons ... 7480f0257eaSTom Tucker */ 7490f0257eaSTom Tucker set_current_state(TASK_INTERRUPTIBLE); 75022700f3cSTrond Myklebust smp_mb__before_atomic(); 75122700f3cSTrond Myklebust clear_bit(SP_CONGESTED, &pool->sp_flags); 752b1691bc0SJeff Layton clear_bit(RQ_BUSY, &rqstp->rq_flags); 75322700f3cSTrond Myklebust smp_mb__after_atomic(); 7547086721fSJeff Layton 755b1691bc0SJeff Layton if (likely(rqst_should_sleep(rqstp))) 75603cf6c9fSGreg Banks time_left = schedule_timeout(timeout); 757b1691bc0SJeff Layton else 758983c6844STrond Myklebust __set_current_state(TASK_RUNNING); 7590f0257eaSTom Tucker 7600f0257eaSTom Tucker try_to_freeze(); 7610f0257eaSTom Tucker 762b1691bc0SJeff Layton set_bit(RQ_BUSY, &rqstp->rq_flags); 76322700f3cSTrond Myklebust smp_mb__after_atomic(); 76422700f3cSTrond Myklebust rqstp->rq_xprt = svc_xprt_dequeue(pool); 76522700f3cSTrond Myklebust if (rqstp->rq_xprt) 76622700f3cSTrond Myklebust goto out_found; 767106f359cSTrond Myklebust 76803cf6c9fSGreg Banks if (!time_left) 769ccf08bedSChuck Lever percpu_counter_inc(&pool->sp_threads_timedout); 7700f0257eaSTom Tucker 7717086721fSJeff Layton if (signalled() || kthread_should_stop()) 7726797fa5aSJ. Bruce Fields return ERR_PTR(-EINTR); 7736797fa5aSJ. Bruce Fields return ERR_PTR(-EAGAIN); 77422700f3cSTrond Myklebust out_found: 77522700f3cSTrond Myklebust /* Normally we will wait up to 5 seconds for any required 77622700f3cSTrond Myklebust * cache information to be provided. 77722700f3cSTrond Myklebust */ 77822700f3cSTrond Myklebust if (!test_bit(SP_CONGESTED, &pool->sp_flags)) 77922700f3cSTrond Myklebust rqstp->rq_chandle.thread_wait = 5*HZ; 78022700f3cSTrond Myklebust else 78122700f3cSTrond Myklebust rqstp->rq_chandle.thread_wait = 1*HZ; 78255f5088cSChuck Lever trace_svc_xprt_dequeue(rqstp); 78322700f3cSTrond Myklebust return rqstp->rq_xprt; 7840f0257eaSTom Tucker } 7850f0257eaSTom Tucker 786e1d83ee6SRashika Kheria static void svc_add_new_temp_xprt(struct svc_serv *serv, struct svc_xprt *newxpt) 78765b2e665SJ. Bruce Fields { 78865b2e665SJ. Bruce Fields spin_lock_bh(&serv->sv_lock); 78965b2e665SJ. Bruce Fields set_bit(XPT_TEMP, &newxpt->xpt_flags); 79065b2e665SJ. Bruce Fields list_add(&newxpt->xpt_list, &serv->sv_tempsocks); 79165b2e665SJ. Bruce Fields serv->sv_tmpcnt++; 79265b2e665SJ. Bruce Fields if (serv->sv_temptimer.function == NULL) { 79365b2e665SJ. Bruce Fields /* setup timer to age temp transports */ 794841b86f3SKees Cook serv->sv_temptimer.function = svc_age_temp_xprts; 79565b2e665SJ. Bruce Fields mod_timer(&serv->sv_temptimer, 79665b2e665SJ. Bruce Fields jiffies + svc_conn_age_period * HZ); 79765b2e665SJ. Bruce Fields } 79865b2e665SJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 79965b2e665SJ. Bruce Fields svc_xprt_received(newxpt); 80065b2e665SJ. Bruce Fields } 80165b2e665SJ. Bruce Fields 8026797fa5aSJ. Bruce Fields static int svc_handle_xprt(struct svc_rqst *rqstp, struct svc_xprt *xprt) 8036797fa5aSJ. Bruce Fields { 8046797fa5aSJ. Bruce Fields struct svc_serv *serv = rqstp->rq_server; 8056797fa5aSJ. Bruce Fields int len = 0; 8066797fa5aSJ. Bruce Fields 8071b644b6eSJ. Bruce Fields if (test_bit(XPT_CLOSE, &xprt->xpt_flags)) { 808546125d1SScott Mayhew if (test_and_clear_bit(XPT_KILL_TEMP, &xprt->xpt_flags)) 809546125d1SScott Mayhew xprt->xpt_ops->xpo_kill_temp_xprt(xprt); 8101b644b6eSJ. Bruce Fields svc_delete_xprt(xprt); 811ca7896cdSJ. Bruce Fields /* Leave XPT_BUSY set on the dead xprt: */ 81283a712e0SJeff Layton goto out; 813ca7896cdSJ. Bruce Fields } 814ca7896cdSJ. Bruce Fields if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) { 8150f0257eaSTom Tucker struct svc_xprt *newxpt; 8160f0257eaSTom Tucker /* 8170f0257eaSTom Tucker * We know this module_get will succeed because the 8180f0257eaSTom Tucker * listener holds a reference too 8190f0257eaSTom Tucker */ 82065b2e665SJ. Bruce Fields __module_get(xprt->xpt_class->xcl_owner); 8210f0257eaSTom Tucker svc_check_conn_limits(xprt->xpt_server); 82265b2e665SJ. Bruce Fields newxpt = xprt->xpt_ops->xpo_accept(xprt); 8231237d354STrond Myklebust if (newxpt) { 8241237d354STrond Myklebust newxpt->xpt_cred = get_cred(xprt->xpt_cred); 82565b2e665SJ. Bruce Fields svc_add_new_temp_xprt(serv, newxpt); 82611bbb0f7SChuck Lever trace_svc_xprt_accept(newxpt, serv->sv_name); 82782011c80SChuck Lever } else { 828c789102cSTrond Myklebust module_put(xprt->xpt_class->xcl_owner); 82982011c80SChuck Lever } 83082011c80SChuck Lever svc_xprt_received(xprt); 831*b3cbf98eSChuck Lever } else if (test_bit(XPT_HANDSHAKE, &xprt->xpt_flags)) { 832*b3cbf98eSChuck Lever xprt->xpt_ops->xpo_handshake(xprt); 833*b3cbf98eSChuck Lever svc_xprt_received(xprt); 834ff3ac5c3STrond Myklebust } else if (svc_xprt_reserve_slot(rqstp, xprt)) { 8356797fa5aSJ. Bruce Fields /* XPT_DATA|XPT_DEFERRED case: */ 8360f0257eaSTom Tucker dprintk("svc: server %p, pool %u, transport %p, inuse=%d\n", 8376797fa5aSJ. Bruce Fields rqstp, rqstp->rq_pool->sp_id, xprt, 8382c935bc5SPeter Zijlstra kref_read(&xprt->xpt_ref)); 8390f0257eaSTom Tucker rqstp->rq_deferred = svc_deferred_dequeue(xprt); 840ca7896cdSJ. Bruce Fields if (rqstp->rq_deferred) 8410f0257eaSTom Tucker len = svc_deferred_recv(rqstp); 842ca7896cdSJ. Bruce Fields else 8430f0257eaSTom Tucker len = xprt->xpt_ops->xpo_recvfrom(rqstp); 844aaba72cdSChuck Lever rqstp->rq_stime = ktime_get(); 845d10f27a7SJ. Bruce Fields rqstp->rq_reserved = serv->sv_max_mesg; 846d10f27a7SJ. Bruce Fields atomic_add(rqstp->rq_reserved, &xprt->xpt_reserved); 847062b829cSTrond Myklebust } else 848062b829cSTrond Myklebust svc_xprt_received(xprt); 8495089f3d9SChuck Lever 85083a712e0SJeff Layton out: 8516797fa5aSJ. Bruce Fields return len; 8526797fa5aSJ. Bruce Fields } 8536797fa5aSJ. Bruce Fields 8546797fa5aSJ. Bruce Fields /* 8556797fa5aSJ. Bruce Fields * Receive the next request on any transport. This code is carefully 8566797fa5aSJ. Bruce Fields * organised not to touch any cachelines in the shared svc_serv 8576797fa5aSJ. Bruce Fields * structure, only cachelines in the local svc_pool. 8586797fa5aSJ. Bruce Fields */ 8596797fa5aSJ. Bruce Fields int svc_recv(struct svc_rqst *rqstp, long timeout) 8606797fa5aSJ. Bruce Fields { 8616797fa5aSJ. Bruce Fields struct svc_xprt *xprt = NULL; 8626797fa5aSJ. Bruce Fields struct svc_serv *serv = rqstp->rq_server; 8636797fa5aSJ. Bruce Fields int len, err; 8646797fa5aSJ. Bruce Fields 8656797fa5aSJ. Bruce Fields err = svc_alloc_arg(rqstp); 8666797fa5aSJ. Bruce Fields if (err) 867860a0d9eSJeff Layton goto out; 8686797fa5aSJ. Bruce Fields 8696797fa5aSJ. Bruce Fields try_to_freeze(); 8706797fa5aSJ. Bruce Fields cond_resched(); 871860a0d9eSJeff Layton err = -EINTR; 8726797fa5aSJ. Bruce Fields if (signalled() || kthread_should_stop()) 873860a0d9eSJeff Layton goto out; 8746797fa5aSJ. Bruce Fields 8756797fa5aSJ. Bruce Fields xprt = svc_get_next_xprt(rqstp, timeout); 876860a0d9eSJeff Layton if (IS_ERR(xprt)) { 877860a0d9eSJeff Layton err = PTR_ERR(xprt); 878860a0d9eSJeff Layton goto out; 879860a0d9eSJeff Layton } 8806797fa5aSJ. Bruce Fields 8816797fa5aSJ. Bruce Fields len = svc_handle_xprt(rqstp, xprt); 8820f0257eaSTom Tucker 8830f0257eaSTom Tucker /* No data, incomplete (TCP) read, or accept() */ 884860a0d9eSJeff Layton err = -EAGAIN; 8859f9d2ebeSJ. Bruce Fields if (len <= 0) 886860a0d9eSJeff Layton goto out_release; 8875f39d271SChuck Lever trace_svc_xdr_recvfrom(&rqstp->rq_arg); 888ca7896cdSJ. Bruce Fields 8890f0257eaSTom Tucker clear_bit(XPT_OLD, &xprt->xpt_flags); 8900f0257eaSTom Tucker 8910f0257eaSTom Tucker rqstp->rq_chandle.defer = svc_defer; 8920f0257eaSTom Tucker 8930f0257eaSTom Tucker if (serv->sv_stats) 8940f0257eaSTom Tucker serv->sv_stats->netcnt++; 8950f0257eaSTom Tucker return len; 896860a0d9eSJeff Layton out_release: 897ca7896cdSJ. Bruce Fields rqstp->rq_res.len = 0; 898ca7896cdSJ. Bruce Fields svc_xprt_release(rqstp); 899860a0d9eSJeff Layton out: 900860a0d9eSJeff Layton return err; 9010f0257eaSTom Tucker } 90224c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_recv); 9030f0257eaSTom Tucker 9040f0257eaSTom Tucker /* 9050f0257eaSTom Tucker * Drop request 9060f0257eaSTom Tucker */ 9070f0257eaSTom Tucker void svc_drop(struct svc_rqst *rqstp) 9080f0257eaSTom Tucker { 909104f6351STrond Myklebust trace_svc_drop(rqstp); 9100f0257eaSTom Tucker svc_xprt_release(rqstp); 9110f0257eaSTom Tucker } 91224c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_drop); 9130f0257eaSTom Tucker 91455fcc7d9SChuck Lever /** 91555fcc7d9SChuck Lever * svc_send - Return reply to client 91655fcc7d9SChuck Lever * @rqstp: RPC transaction context 91755fcc7d9SChuck Lever * 9180f0257eaSTom Tucker */ 91955fcc7d9SChuck Lever void svc_send(struct svc_rqst *rqstp) 9200f0257eaSTom Tucker { 9210f0257eaSTom Tucker struct svc_xprt *xprt; 9220f0257eaSTom Tucker struct xdr_buf *xb; 92355fcc7d9SChuck Lever int status; 9240f0257eaSTom Tucker 9250f0257eaSTom Tucker xprt = rqstp->rq_xprt; 9260f0257eaSTom Tucker if (!xprt) 92755fcc7d9SChuck Lever return; 9280f0257eaSTom Tucker 9290f0257eaSTom Tucker /* calculate over-all length */ 9300f0257eaSTom Tucker xb = &rqstp->rq_res; 9310f0257eaSTom Tucker xb->len = xb->head[0].iov_len + 9320f0257eaSTom Tucker xb->page_len + 9330f0257eaSTom Tucker xb->tail[0].iov_len; 9345f39d271SChuck Lever trace_svc_xdr_sendto(rqstp->rq_xid, xb); 935aaba72cdSChuck Lever trace_svc_stats_latency(rqstp); 936ca4faf54SChuck Lever 93755fcc7d9SChuck Lever status = xprt->xpt_ops->xpo_sendto(rqstp); 938ca4faf54SChuck Lever 93955fcc7d9SChuck Lever trace_svc_send(rqstp, status); 9400f0257eaSTom Tucker svc_xprt_release(rqstp); 9410f0257eaSTom Tucker } 9420f0257eaSTom Tucker 9430f0257eaSTom Tucker /* 9440f0257eaSTom Tucker * Timer function to close old temporary transports, using 9450f0257eaSTom Tucker * a mark-and-sweep algorithm. 9460f0257eaSTom Tucker */ 947ff861c4dSKees Cook static void svc_age_temp_xprts(struct timer_list *t) 9480f0257eaSTom Tucker { 949ff861c4dSKees Cook struct svc_serv *serv = from_timer(serv, t, sv_temptimer); 9500f0257eaSTom Tucker struct svc_xprt *xprt; 9510f0257eaSTom Tucker struct list_head *le, *next; 9520f0257eaSTom Tucker 9530f0257eaSTom Tucker dprintk("svc_age_temp_xprts\n"); 9540f0257eaSTom Tucker 9550f0257eaSTom Tucker if (!spin_trylock_bh(&serv->sv_lock)) { 9560f0257eaSTom Tucker /* busy, try again 1 sec later */ 9570f0257eaSTom Tucker dprintk("svc_age_temp_xprts: busy\n"); 9580f0257eaSTom Tucker mod_timer(&serv->sv_temptimer, jiffies + HZ); 9590f0257eaSTom Tucker return; 9600f0257eaSTom Tucker } 9610f0257eaSTom Tucker 9620f0257eaSTom Tucker list_for_each_safe(le, next, &serv->sv_tempsocks) { 9630f0257eaSTom Tucker xprt = list_entry(le, struct svc_xprt, xpt_list); 9640f0257eaSTom Tucker 9650f0257eaSTom Tucker /* First time through, just mark it OLD. Second time 9660f0257eaSTom Tucker * through, close it. */ 9670f0257eaSTom Tucker if (!test_and_set_bit(XPT_OLD, &xprt->xpt_flags)) 9680f0257eaSTom Tucker continue; 9692c935bc5SPeter Zijlstra if (kref_read(&xprt->xpt_ref) > 1 || 970f64f9e71SJoe Perches test_bit(XPT_BUSY, &xprt->xpt_flags)) 9710f0257eaSTom Tucker continue; 972e75bafbfSJ. Bruce Fields list_del_init(le); 9730f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 9740f0257eaSTom Tucker dprintk("queuing xprt %p for closing\n", xprt); 9750f0257eaSTom Tucker 9760f0257eaSTom Tucker /* a thread will dequeue and close it soon */ 9770f0257eaSTom Tucker svc_xprt_enqueue(xprt); 9780f0257eaSTom Tucker } 979e75bafbfSJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 9800f0257eaSTom Tucker 9810f0257eaSTom Tucker mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ); 9820f0257eaSTom Tucker } 9830f0257eaSTom Tucker 984c3d4879eSScott Mayhew /* Close temporary transports whose xpt_local matches server_addr immediately 985c3d4879eSScott Mayhew * instead of waiting for them to be picked up by the timer. 986c3d4879eSScott Mayhew * 987c3d4879eSScott Mayhew * This is meant to be called from a notifier_block that runs when an ip 988c3d4879eSScott Mayhew * address is deleted. 989c3d4879eSScott Mayhew */ 990c3d4879eSScott Mayhew void svc_age_temp_xprts_now(struct svc_serv *serv, struct sockaddr *server_addr) 991c3d4879eSScott Mayhew { 992c3d4879eSScott Mayhew struct svc_xprt *xprt; 993c3d4879eSScott Mayhew struct list_head *le, *next; 994c3d4879eSScott Mayhew LIST_HEAD(to_be_closed); 995c3d4879eSScott Mayhew 996c3d4879eSScott Mayhew spin_lock_bh(&serv->sv_lock); 997c3d4879eSScott Mayhew list_for_each_safe(le, next, &serv->sv_tempsocks) { 998c3d4879eSScott Mayhew xprt = list_entry(le, struct svc_xprt, xpt_list); 999c3d4879eSScott Mayhew if (rpc_cmp_addr(server_addr, (struct sockaddr *) 1000c3d4879eSScott Mayhew &xprt->xpt_local)) { 1001c3d4879eSScott Mayhew dprintk("svc_age_temp_xprts_now: found %p\n", xprt); 1002c3d4879eSScott Mayhew list_move(le, &to_be_closed); 1003c3d4879eSScott Mayhew } 1004c3d4879eSScott Mayhew } 1005c3d4879eSScott Mayhew spin_unlock_bh(&serv->sv_lock); 1006c3d4879eSScott Mayhew 1007c3d4879eSScott Mayhew while (!list_empty(&to_be_closed)) { 1008c3d4879eSScott Mayhew le = to_be_closed.next; 1009c3d4879eSScott Mayhew list_del_init(le); 1010c3d4879eSScott Mayhew xprt = list_entry(le, struct svc_xprt, xpt_list); 1011546125d1SScott Mayhew set_bit(XPT_CLOSE, &xprt->xpt_flags); 1012546125d1SScott Mayhew set_bit(XPT_KILL_TEMP, &xprt->xpt_flags); 1013546125d1SScott Mayhew dprintk("svc_age_temp_xprts_now: queuing xprt %p for closing\n", 1014546125d1SScott Mayhew xprt); 1015546125d1SScott Mayhew svc_xprt_enqueue(xprt); 1016c3d4879eSScott Mayhew } 1017c3d4879eSScott Mayhew } 1018c3d4879eSScott Mayhew EXPORT_SYMBOL_GPL(svc_age_temp_xprts_now); 1019c3d4879eSScott Mayhew 1020edc7a894SJ. Bruce Fields static void call_xpt_users(struct svc_xprt *xprt) 1021edc7a894SJ. Bruce Fields { 1022edc7a894SJ. Bruce Fields struct svc_xpt_user *u; 1023edc7a894SJ. Bruce Fields 1024edc7a894SJ. Bruce Fields spin_lock(&xprt->xpt_lock); 1025edc7a894SJ. Bruce Fields while (!list_empty(&xprt->xpt_users)) { 1026edc7a894SJ. Bruce Fields u = list_first_entry(&xprt->xpt_users, struct svc_xpt_user, list); 1027bb6ad557STrond Myklebust list_del_init(&u->list); 1028edc7a894SJ. Bruce Fields u->callback(u); 1029edc7a894SJ. Bruce Fields } 1030edc7a894SJ. Bruce Fields spin_unlock(&xprt->xpt_lock); 1031edc7a894SJ. Bruce Fields } 1032edc7a894SJ. Bruce Fields 10330f0257eaSTom Tucker /* 10340f0257eaSTom Tucker * Remove a dead transport 10350f0257eaSTom Tucker */ 10367710ec36SJ. Bruce Fields static void svc_delete_xprt(struct svc_xprt *xprt) 10370f0257eaSTom Tucker { 10380f0257eaSTom Tucker struct svc_serv *serv = xprt->xpt_server; 103922945e4aSTom Tucker struct svc_deferred_req *dr; 104022945e4aSTom Tucker 104122945e4aSTom Tucker if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags)) 104211bbb0f7SChuck Lever return; 10430f0257eaSTom Tucker 104411bbb0f7SChuck Lever trace_svc_xprt_detach(xprt); 10450f0257eaSTom Tucker xprt->xpt_ops->xpo_detach(xprt); 10466221f1d9SChuck Lever if (xprt->xpt_bc_xprt) 10476221f1d9SChuck Lever xprt->xpt_bc_xprt->ops->close(xprt->xpt_bc_xprt); 10480f0257eaSTom Tucker 10490f0257eaSTom Tucker spin_lock_bh(&serv->sv_lock); 10500f0257eaSTom Tucker list_del_init(&xprt->xpt_list); 105101047298SWeston Andros Adamson WARN_ON_ONCE(!list_empty(&xprt->xpt_ready)); 10520f0257eaSTom Tucker if (test_bit(XPT_TEMP, &xprt->xpt_flags)) 10530f0257eaSTom Tucker serv->sv_tmpcnt--; 1054788e69e5SJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 105522945e4aSTom Tucker 1056ab1b18f7SNeil Brown while ((dr = svc_deferred_dequeue(xprt)) != NULL) 105722945e4aSTom Tucker kfree(dr); 105822945e4aSTom Tucker 1059edc7a894SJ. Bruce Fields call_xpt_users(xprt); 106022945e4aSTom Tucker svc_xprt_put(xprt); 10610f0257eaSTom Tucker } 10620f0257eaSTom Tucker 10634355d767SChuck Lever /** 10644355d767SChuck Lever * svc_xprt_close - Close a client connection 10654355d767SChuck Lever * @xprt: transport to disconnect 10664355d767SChuck Lever * 10674355d767SChuck Lever */ 10684355d767SChuck Lever void svc_xprt_close(struct svc_xprt *xprt) 10690f0257eaSTom Tucker { 107011bbb0f7SChuck Lever trace_svc_xprt_close(xprt); 10710f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 10720f0257eaSTom Tucker if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) 10730f0257eaSTom Tucker /* someone else will have to effect the close */ 10740f0257eaSTom Tucker return; 1075b1763316SJ. Bruce Fields /* 1076b1763316SJ. Bruce Fields * We expect svc_close_xprt() to work even when no threads are 1077b1763316SJ. Bruce Fields * running (e.g., while configuring the server before starting 1078b1763316SJ. Bruce Fields * any threads), so if the transport isn't busy, we delete 1079b1763316SJ. Bruce Fields * it ourself: 1080b1763316SJ. Bruce Fields */ 10810f0257eaSTom Tucker svc_delete_xprt(xprt); 10820f0257eaSTom Tucker } 10834355d767SChuck Lever EXPORT_SYMBOL_GPL(svc_xprt_close); 10840f0257eaSTom Tucker 1085cc630d9fSJ. Bruce Fields static int svc_close_list(struct svc_serv *serv, struct list_head *xprt_list, struct net *net) 10860f0257eaSTom Tucker { 10870f0257eaSTom Tucker struct svc_xprt *xprt; 1088cc630d9fSJ. Bruce Fields int ret = 0; 10890f0257eaSTom Tucker 1090c7de87ffSJoe Korty spin_lock_bh(&serv->sv_lock); 1091b4f36f88SJ. Bruce Fields list_for_each_entry(xprt, xprt_list, xpt_list) { 10927b147f1fSStanislav Kinsbursky if (xprt->xpt_net != net) 10937b147f1fSStanislav Kinsbursky continue; 1094cc630d9fSJ. Bruce Fields ret++; 10950f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 1096cc630d9fSJ. Bruce Fields svc_xprt_enqueue(xprt); 10970f0257eaSTom Tucker } 1098c7de87ffSJoe Korty spin_unlock_bh(&serv->sv_lock); 1099cc630d9fSJ. Bruce Fields return ret; 11000f0257eaSTom Tucker } 11010f0257eaSTom Tucker 1102cc630d9fSJ. Bruce Fields static struct svc_xprt *svc_dequeue_net(struct svc_serv *serv, struct net *net) 11032fefb8a0SJ. Bruce Fields { 1104b4f36f88SJ. Bruce Fields struct svc_pool *pool; 1105b4f36f88SJ. Bruce Fields struct svc_xprt *xprt; 1106b4f36f88SJ. Bruce Fields struct svc_xprt *tmp; 1107b4f36f88SJ. Bruce Fields int i; 1108b4f36f88SJ. Bruce Fields 1109b4f36f88SJ. Bruce Fields for (i = 0; i < serv->sv_nrpools; i++) { 1110b4f36f88SJ. Bruce Fields pool = &serv->sv_pools[i]; 1111b4f36f88SJ. Bruce Fields 1112b4f36f88SJ. Bruce Fields spin_lock_bh(&pool->sp_lock); 11136f513365SStanislav Kinsbursky list_for_each_entry_safe(xprt, tmp, &pool->sp_sockets, xpt_ready) { 11147b147f1fSStanislav Kinsbursky if (xprt->xpt_net != net) 11157b147f1fSStanislav Kinsbursky continue; 1116b4f36f88SJ. Bruce Fields list_del_init(&xprt->xpt_ready); 1117cc630d9fSJ. Bruce Fields spin_unlock_bh(&pool->sp_lock); 1118cc630d9fSJ. Bruce Fields return xprt; 1119b4f36f88SJ. Bruce Fields } 1120b4f36f88SJ. Bruce Fields spin_unlock_bh(&pool->sp_lock); 1121b4f36f88SJ. Bruce Fields } 1122cc630d9fSJ. Bruce Fields return NULL; 11236f513365SStanislav Kinsbursky } 11246f513365SStanislav Kinsbursky 1125cc630d9fSJ. Bruce Fields static void svc_clean_up_xprts(struct svc_serv *serv, struct net *net) 11266f513365SStanislav Kinsbursky { 11276f513365SStanislav Kinsbursky struct svc_xprt *xprt; 11286f513365SStanislav Kinsbursky 1129cc630d9fSJ. Bruce Fields while ((xprt = svc_dequeue_net(serv, net))) { 1130cc630d9fSJ. Bruce Fields set_bit(XPT_CLOSE, &xprt->xpt_flags); 1131719f8bccSJ. Bruce Fields svc_delete_xprt(xprt); 11323a22bf50SStanislav Kinsbursky } 1133cc630d9fSJ. Bruce Fields } 11343a22bf50SStanislav Kinsbursky 1135c7d7ec8fSChuck Lever /** 1136c7d7ec8fSChuck Lever * svc_xprt_destroy_all - Destroy transports associated with @serv 1137c7d7ec8fSChuck Lever * @serv: RPC service to be shut down 1138c7d7ec8fSChuck Lever * @net: target network namespace 1139c7d7ec8fSChuck Lever * 1140cc630d9fSJ. Bruce Fields * Server threads may still be running (especially in the case where the 1141cc630d9fSJ. Bruce Fields * service is still running in other network namespaces). 1142cc630d9fSJ. Bruce Fields * 1143cc630d9fSJ. Bruce Fields * So we shut down sockets the same way we would on a running server, by 1144cc630d9fSJ. Bruce Fields * setting XPT_CLOSE, enqueuing, and letting a thread pick it up to do 1145cc630d9fSJ. Bruce Fields * the close. In the case there are no such other threads, 1146cc630d9fSJ. Bruce Fields * threads running, svc_clean_up_xprts() does a simple version of a 1147cc630d9fSJ. Bruce Fields * server's main event loop, and in the case where there are other 1148cc630d9fSJ. Bruce Fields * threads, we may need to wait a little while and then check again to 1149cc630d9fSJ. Bruce Fields * see if they're done. 1150cc630d9fSJ. Bruce Fields */ 1151c7d7ec8fSChuck Lever void svc_xprt_destroy_all(struct svc_serv *serv, struct net *net) 11523a22bf50SStanislav Kinsbursky { 1153cc630d9fSJ. Bruce Fields int delay = 0; 11546f513365SStanislav Kinsbursky 1155cc630d9fSJ. Bruce Fields while (svc_close_list(serv, &serv->sv_permsocks, net) + 1156cc630d9fSJ. Bruce Fields svc_close_list(serv, &serv->sv_tempsocks, net)) { 1157cc630d9fSJ. Bruce Fields 1158cc630d9fSJ. Bruce Fields svc_clean_up_xprts(serv, net); 1159cc630d9fSJ. Bruce Fields msleep(delay++); 1160cc630d9fSJ. Bruce Fields } 11612fefb8a0SJ. Bruce Fields } 1162c7d7ec8fSChuck Lever EXPORT_SYMBOL_GPL(svc_xprt_destroy_all); 11632fefb8a0SJ. Bruce Fields 11640f0257eaSTom Tucker /* 11650f0257eaSTom Tucker * Handle defer and revisit of requests 11660f0257eaSTom Tucker */ 11670f0257eaSTom Tucker 11680f0257eaSTom Tucker static void svc_revisit(struct cache_deferred_req *dreq, int too_many) 11690f0257eaSTom Tucker { 11700f0257eaSTom Tucker struct svc_deferred_req *dr = 11710f0257eaSTom Tucker container_of(dreq, struct svc_deferred_req, handle); 11720f0257eaSTom Tucker struct svc_xprt *xprt = dr->xprt; 11730f0257eaSTom Tucker 117422945e4aSTom Tucker spin_lock(&xprt->xpt_lock); 117522945e4aSTom Tucker set_bit(XPT_DEFERRED, &xprt->xpt_flags); 117622945e4aSTom Tucker if (too_many || test_bit(XPT_DEAD, &xprt->xpt_flags)) { 117722945e4aSTom Tucker spin_unlock(&xprt->xpt_lock); 11788954c5c2SChuck Lever trace_svc_defer_drop(dr); 11790f0257eaSTom Tucker svc_xprt_put(xprt); 11800f0257eaSTom Tucker kfree(dr); 11810f0257eaSTom Tucker return; 11820f0257eaSTom Tucker } 11830f0257eaSTom Tucker dr->xprt = NULL; 11840f0257eaSTom Tucker list_add(&dr->handle.recent, &xprt->xpt_deferred); 11850f0257eaSTom Tucker spin_unlock(&xprt->xpt_lock); 11868954c5c2SChuck Lever trace_svc_defer_queue(dr); 11870f0257eaSTom Tucker svc_xprt_enqueue(xprt); 11880f0257eaSTom Tucker svc_xprt_put(xprt); 11890f0257eaSTom Tucker } 11900f0257eaSTom Tucker 1191260c1d12STom Tucker /* 1192260c1d12STom Tucker * Save the request off for later processing. The request buffer looks 1193260c1d12STom Tucker * like this: 1194260c1d12STom Tucker * 1195260c1d12STom Tucker * <xprt-header><rpc-header><rpc-pagelist><rpc-tail> 1196260c1d12STom Tucker * 1197260c1d12STom Tucker * This code can only handle requests that consist of an xprt-header 1198260c1d12STom Tucker * and rpc-header. 1199260c1d12STom Tucker */ 12000f0257eaSTom Tucker static struct cache_deferred_req *svc_defer(struct cache_req *req) 12010f0257eaSTom Tucker { 12020f0257eaSTom Tucker struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle); 12030f0257eaSTom Tucker struct svc_deferred_req *dr; 12040f0257eaSTom Tucker 120530660e04SJeff Layton if (rqstp->rq_arg.page_len || !test_bit(RQ_USEDEFERRAL, &rqstp->rq_flags)) 12060f0257eaSTom Tucker return NULL; /* if more than a page, give up FIXME */ 12070f0257eaSTom Tucker if (rqstp->rq_deferred) { 12080f0257eaSTom Tucker dr = rqstp->rq_deferred; 12090f0257eaSTom Tucker rqstp->rq_deferred = NULL; 12100f0257eaSTom Tucker } else { 1211260c1d12STom Tucker size_t skip; 1212260c1d12STom Tucker size_t size; 12130f0257eaSTom Tucker /* FIXME maybe discard if size too large */ 1214260c1d12STom Tucker size = sizeof(struct svc_deferred_req) + rqstp->rq_arg.len; 12150f0257eaSTom Tucker dr = kmalloc(size, GFP_KERNEL); 12160f0257eaSTom Tucker if (dr == NULL) 12170f0257eaSTom Tucker return NULL; 12180f0257eaSTom Tucker 12190f0257eaSTom Tucker dr->handle.owner = rqstp->rq_server; 12200f0257eaSTom Tucker dr->prot = rqstp->rq_prot; 12210f0257eaSTom Tucker memcpy(&dr->addr, &rqstp->rq_addr, rqstp->rq_addrlen); 12220f0257eaSTom Tucker dr->addrlen = rqstp->rq_addrlen; 12230f0257eaSTom Tucker dr->daddr = rqstp->rq_daddr; 12240f0257eaSTom Tucker dr->argslen = rqstp->rq_arg.len >> 2; 1225773f91b2SChuck Lever dr->xprt_ctxt = rqstp->rq_xprt_ctxt; 1226773f91b2SChuck Lever rqstp->rq_xprt_ctxt = NULL; 1227260c1d12STom Tucker 1228260c1d12STom Tucker /* back up head to the start of the buffer and copy */ 1229260c1d12STom Tucker skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; 12300f0257eaSTom Tucker memcpy(dr->args, rqstp->rq_arg.head[0].iov_base - skip, 12310f0257eaSTom Tucker dr->argslen << 2); 12320f0257eaSTom Tucker } 12338954c5c2SChuck Lever trace_svc_defer(rqstp); 12340f0257eaSTom Tucker svc_xprt_get(rqstp->rq_xprt); 12350f0257eaSTom Tucker dr->xprt = rqstp->rq_xprt; 12367827c81fSChuck Lever set_bit(RQ_DROPME, &rqstp->rq_flags); 12370f0257eaSTom Tucker 12380f0257eaSTom Tucker dr->handle.revisit = svc_revisit; 12390f0257eaSTom Tucker return &dr->handle; 12400f0257eaSTom Tucker } 12410f0257eaSTom Tucker 12420f0257eaSTom Tucker /* 12430f0257eaSTom Tucker * recv data from a deferred request into an active one 12440f0257eaSTom Tucker */ 12458954c5c2SChuck Lever static noinline int svc_deferred_recv(struct svc_rqst *rqstp) 12460f0257eaSTom Tucker { 12470f0257eaSTom Tucker struct svc_deferred_req *dr = rqstp->rq_deferred; 12480f0257eaSTom Tucker 12498954c5c2SChuck Lever trace_svc_defer_recv(dr); 12508954c5c2SChuck Lever 1251260c1d12STom Tucker /* setup iov_base past transport header */ 1252983084b2SChuck Lever rqstp->rq_arg.head[0].iov_base = dr->args; 1253260c1d12STom Tucker /* The iov_len does not include the transport header bytes */ 1254983084b2SChuck Lever rqstp->rq_arg.head[0].iov_len = dr->argslen << 2; 12550f0257eaSTom Tucker rqstp->rq_arg.page_len = 0; 1256260c1d12STom Tucker /* The rq_arg.len includes the transport header bytes */ 12570f0257eaSTom Tucker rqstp->rq_arg.len = dr->argslen << 2; 12580f0257eaSTom Tucker rqstp->rq_prot = dr->prot; 12590f0257eaSTom Tucker memcpy(&rqstp->rq_addr, &dr->addr, dr->addrlen); 12600f0257eaSTom Tucker rqstp->rq_addrlen = dr->addrlen; 1261260c1d12STom Tucker /* Save off transport header len in case we get deferred again */ 12620f0257eaSTom Tucker rqstp->rq_daddr = dr->daddr; 12630f0257eaSTom Tucker rqstp->rq_respages = rqstp->rq_pages; 1264773f91b2SChuck Lever rqstp->rq_xprt_ctxt = dr->xprt_ctxt; 126582011c80SChuck Lever svc_xprt_received(rqstp->rq_xprt); 1266983084b2SChuck Lever return dr->argslen << 2; 12670f0257eaSTom Tucker } 12680f0257eaSTom Tucker 12690f0257eaSTom Tucker 12700f0257eaSTom Tucker static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt) 12710f0257eaSTom Tucker { 12720f0257eaSTom Tucker struct svc_deferred_req *dr = NULL; 12730f0257eaSTom Tucker 12740f0257eaSTom Tucker if (!test_bit(XPT_DEFERRED, &xprt->xpt_flags)) 12750f0257eaSTom Tucker return NULL; 12760f0257eaSTom Tucker spin_lock(&xprt->xpt_lock); 12770f0257eaSTom Tucker if (!list_empty(&xprt->xpt_deferred)) { 12780f0257eaSTom Tucker dr = list_entry(xprt->xpt_deferred.next, 12790f0257eaSTom Tucker struct svc_deferred_req, 12800f0257eaSTom Tucker handle.recent); 12810f0257eaSTom Tucker list_del_init(&dr->handle.recent); 128262bac4afSJ. Bruce Fields } else 128362bac4afSJ. Bruce Fields clear_bit(XPT_DEFERRED, &xprt->xpt_flags); 12840f0257eaSTom Tucker spin_unlock(&xprt->xpt_lock); 12850f0257eaSTom Tucker return dr; 12860f0257eaSTom Tucker } 12877fcb98d5STom Tucker 1288156e6209SChuck Lever /** 1289156e6209SChuck Lever * svc_find_xprt - find an RPC transport instance 1290156e6209SChuck Lever * @serv: pointer to svc_serv to search 1291156e6209SChuck Lever * @xcl_name: C string containing transport's class name 12924cb54ca2SStanislav Kinsbursky * @net: owner net pointer 1293156e6209SChuck Lever * @af: Address family of transport's local address 1294156e6209SChuck Lever * @port: transport's IP port number 1295156e6209SChuck Lever * 12967fcb98d5STom Tucker * Return the transport instance pointer for the endpoint accepting 12977fcb98d5STom Tucker * connections/peer traffic from the specified transport class, 12987fcb98d5STom Tucker * address family and port. 12997fcb98d5STom Tucker * 13007fcb98d5STom Tucker * Specifying 0 for the address family or port is effectively a 13017fcb98d5STom Tucker * wild-card, and will result in matching the first transport in the 13027fcb98d5STom Tucker * service's list that has a matching class name. 13037fcb98d5STom Tucker */ 1304156e6209SChuck Lever struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name, 13054cb54ca2SStanislav Kinsbursky struct net *net, const sa_family_t af, 13064cb54ca2SStanislav Kinsbursky const unsigned short port) 13077fcb98d5STom Tucker { 13087fcb98d5STom Tucker struct svc_xprt *xprt; 13097fcb98d5STom Tucker struct svc_xprt *found = NULL; 13107fcb98d5STom Tucker 13117fcb98d5STom Tucker /* Sanity check the args */ 1312156e6209SChuck Lever if (serv == NULL || xcl_name == NULL) 13137fcb98d5STom Tucker return found; 13147fcb98d5STom Tucker 13157fcb98d5STom Tucker spin_lock_bh(&serv->sv_lock); 13167fcb98d5STom Tucker list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { 13174cb54ca2SStanislav Kinsbursky if (xprt->xpt_net != net) 13184cb54ca2SStanislav Kinsbursky continue; 13197fcb98d5STom Tucker if (strcmp(xprt->xpt_class->xcl_name, xcl_name)) 13207fcb98d5STom Tucker continue; 13217fcb98d5STom Tucker if (af != AF_UNSPEC && af != xprt->xpt_local.ss_family) 13227fcb98d5STom Tucker continue; 1323156e6209SChuck Lever if (port != 0 && port != svc_xprt_local_port(xprt)) 13247fcb98d5STom Tucker continue; 13257fcb98d5STom Tucker found = xprt; 1326a217813fSTom Tucker svc_xprt_get(xprt); 13277fcb98d5STom Tucker break; 13287fcb98d5STom Tucker } 13297fcb98d5STom Tucker spin_unlock_bh(&serv->sv_lock); 13307fcb98d5STom Tucker return found; 13317fcb98d5STom Tucker } 13327fcb98d5STom Tucker EXPORT_SYMBOL_GPL(svc_find_xprt); 13339571af18STom Tucker 1334335c54bdSChuck Lever static int svc_one_xprt_name(const struct svc_xprt *xprt, 1335335c54bdSChuck Lever char *pos, int remaining) 1336335c54bdSChuck Lever { 1337335c54bdSChuck Lever int len; 1338335c54bdSChuck Lever 1339335c54bdSChuck Lever len = snprintf(pos, remaining, "%s %u\n", 1340335c54bdSChuck Lever xprt->xpt_class->xcl_name, 1341335c54bdSChuck Lever svc_xprt_local_port(xprt)); 1342335c54bdSChuck Lever if (len >= remaining) 1343335c54bdSChuck Lever return -ENAMETOOLONG; 1344335c54bdSChuck Lever return len; 1345335c54bdSChuck Lever } 1346335c54bdSChuck Lever 1347335c54bdSChuck Lever /** 1348335c54bdSChuck Lever * svc_xprt_names - format a buffer with a list of transport names 1349335c54bdSChuck Lever * @serv: pointer to an RPC service 1350335c54bdSChuck Lever * @buf: pointer to a buffer to be filled in 1351335c54bdSChuck Lever * @buflen: length of buffer to be filled in 1352335c54bdSChuck Lever * 1353335c54bdSChuck Lever * Fills in @buf with a string containing a list of transport names, 1354335c54bdSChuck Lever * each name terminated with '\n'. 1355335c54bdSChuck Lever * 1356335c54bdSChuck Lever * Returns positive length of the filled-in string on success; otherwise 1357335c54bdSChuck Lever * a negative errno value is returned if an error occurs. 13589571af18STom Tucker */ 1359335c54bdSChuck Lever int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen) 13609571af18STom Tucker { 13619571af18STom Tucker struct svc_xprt *xprt; 1362335c54bdSChuck Lever int len, totlen; 1363335c54bdSChuck Lever char *pos; 13649571af18STom Tucker 13659571af18STom Tucker /* Sanity check args */ 13669571af18STom Tucker if (!serv) 13679571af18STom Tucker return 0; 13689571af18STom Tucker 13699571af18STom Tucker spin_lock_bh(&serv->sv_lock); 1370335c54bdSChuck Lever 1371335c54bdSChuck Lever pos = buf; 1372335c54bdSChuck Lever totlen = 0; 13739571af18STom Tucker list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { 1374335c54bdSChuck Lever len = svc_one_xprt_name(xprt, pos, buflen - totlen); 1375335c54bdSChuck Lever if (len < 0) { 1376335c54bdSChuck Lever *buf = '\0'; 1377335c54bdSChuck Lever totlen = len; 1378335c54bdSChuck Lever } 1379335c54bdSChuck Lever if (len <= 0) 13809571af18STom Tucker break; 1381335c54bdSChuck Lever 1382335c54bdSChuck Lever pos += len; 13839571af18STom Tucker totlen += len; 13849571af18STom Tucker } 1385335c54bdSChuck Lever 13869571af18STom Tucker spin_unlock_bh(&serv->sv_lock); 13879571af18STom Tucker return totlen; 13889571af18STom Tucker } 13899571af18STom Tucker EXPORT_SYMBOL_GPL(svc_xprt_names); 139003cf6c9fSGreg Banks 139103cf6c9fSGreg Banks 139203cf6c9fSGreg Banks /*----------------------------------------------------------------------------*/ 139303cf6c9fSGreg Banks 139403cf6c9fSGreg Banks static void *svc_pool_stats_start(struct seq_file *m, loff_t *pos) 139503cf6c9fSGreg Banks { 139603cf6c9fSGreg Banks unsigned int pidx = (unsigned int)*pos; 139703cf6c9fSGreg Banks struct svc_serv *serv = m->private; 139803cf6c9fSGreg Banks 139903cf6c9fSGreg Banks dprintk("svc_pool_stats_start, *pidx=%u\n", pidx); 140003cf6c9fSGreg Banks 140103cf6c9fSGreg Banks if (!pidx) 140203cf6c9fSGreg Banks return SEQ_START_TOKEN; 140303cf6c9fSGreg Banks return (pidx > serv->sv_nrpools ? NULL : &serv->sv_pools[pidx-1]); 140403cf6c9fSGreg Banks } 140503cf6c9fSGreg Banks 140603cf6c9fSGreg Banks static void *svc_pool_stats_next(struct seq_file *m, void *p, loff_t *pos) 140703cf6c9fSGreg Banks { 140803cf6c9fSGreg Banks struct svc_pool *pool = p; 140903cf6c9fSGreg Banks struct svc_serv *serv = m->private; 141003cf6c9fSGreg Banks 141103cf6c9fSGreg Banks dprintk("svc_pool_stats_next, *pos=%llu\n", *pos); 141203cf6c9fSGreg Banks 141303cf6c9fSGreg Banks if (p == SEQ_START_TOKEN) { 141403cf6c9fSGreg Banks pool = &serv->sv_pools[0]; 141503cf6c9fSGreg Banks } else { 141603cf6c9fSGreg Banks unsigned int pidx = (pool - &serv->sv_pools[0]); 141703cf6c9fSGreg Banks if (pidx < serv->sv_nrpools-1) 141803cf6c9fSGreg Banks pool = &serv->sv_pools[pidx+1]; 141903cf6c9fSGreg Banks else 142003cf6c9fSGreg Banks pool = NULL; 142103cf6c9fSGreg Banks } 142203cf6c9fSGreg Banks ++*pos; 142303cf6c9fSGreg Banks return pool; 142403cf6c9fSGreg Banks } 142503cf6c9fSGreg Banks 142603cf6c9fSGreg Banks static void svc_pool_stats_stop(struct seq_file *m, void *p) 142703cf6c9fSGreg Banks { 142803cf6c9fSGreg Banks } 142903cf6c9fSGreg Banks 143003cf6c9fSGreg Banks static int svc_pool_stats_show(struct seq_file *m, void *p) 143103cf6c9fSGreg Banks { 143203cf6c9fSGreg Banks struct svc_pool *pool = p; 143303cf6c9fSGreg Banks 143403cf6c9fSGreg Banks if (p == SEQ_START_TOKEN) { 143578c210efSJ. Bruce Fields seq_puts(m, "# pool packets-arrived sockets-enqueued threads-woken threads-timedout\n"); 143603cf6c9fSGreg Banks return 0; 143703cf6c9fSGreg Banks } 143803cf6c9fSGreg Banks 1439ccf08bedSChuck Lever seq_printf(m, "%u %llu %llu %llu %llu\n", 144003cf6c9fSGreg Banks pool->sp_id, 1441ccf08bedSChuck Lever percpu_counter_sum_positive(&pool->sp_sockets_queued), 1442ccf08bedSChuck Lever percpu_counter_sum_positive(&pool->sp_sockets_queued), 1443ccf08bedSChuck Lever percpu_counter_sum_positive(&pool->sp_threads_woken), 1444ccf08bedSChuck Lever percpu_counter_sum_positive(&pool->sp_threads_timedout)); 144503cf6c9fSGreg Banks 144603cf6c9fSGreg Banks return 0; 144703cf6c9fSGreg Banks } 144803cf6c9fSGreg Banks 144903cf6c9fSGreg Banks static const struct seq_operations svc_pool_stats_seq_ops = { 145003cf6c9fSGreg Banks .start = svc_pool_stats_start, 145103cf6c9fSGreg Banks .next = svc_pool_stats_next, 145203cf6c9fSGreg Banks .stop = svc_pool_stats_stop, 145303cf6c9fSGreg Banks .show = svc_pool_stats_show, 145403cf6c9fSGreg Banks }; 145503cf6c9fSGreg Banks 145603cf6c9fSGreg Banks int svc_pool_stats_open(struct svc_serv *serv, struct file *file) 145703cf6c9fSGreg Banks { 145803cf6c9fSGreg Banks int err; 145903cf6c9fSGreg Banks 146003cf6c9fSGreg Banks err = seq_open(file, &svc_pool_stats_seq_ops); 146103cf6c9fSGreg Banks if (!err) 146203cf6c9fSGreg Banks ((struct seq_file *) file->private_data)->private = serv; 146303cf6c9fSGreg Banks return err; 146403cf6c9fSGreg Banks } 146503cf6c9fSGreg Banks EXPORT_SYMBOL(svc_pool_stats_open); 146603cf6c9fSGreg Banks 146703cf6c9fSGreg Banks /*----------------------------------------------------------------------------*/ 1468