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 */ 77*02cea33fSChuck Lever 78*02cea33fSChuck Lever /** 79*02cea33fSChuck Lever * svc_reg_xprt_class - Register a server-side RPC transport class 80*02cea33fSChuck Lever * @xcl: New transport class to be registered 81*02cea33fSChuck Lever * 82*02cea33fSChuck Lever * Returns zero on success; otherwise a negative errno is returned. 83*02cea33fSChuck Lever */ 841d8206b9STom Tucker int svc_reg_xprt_class(struct svc_xprt_class *xcl) 851d8206b9STom Tucker { 861d8206b9STom Tucker struct svc_xprt_class *cl; 871d8206b9STom Tucker int res = -EEXIST; 881d8206b9STom Tucker 891d8206b9STom Tucker dprintk("svc: Adding svc transport class '%s'\n", xcl->xcl_name); 901d8206b9STom Tucker 911d8206b9STom Tucker INIT_LIST_HEAD(&xcl->xcl_list); 921d8206b9STom Tucker spin_lock(&svc_xprt_class_lock); 931d8206b9STom Tucker /* Make sure there isn't already a class with the same name */ 941d8206b9STom Tucker list_for_each_entry(cl, &svc_xprt_class_list, xcl_list) { 951d8206b9STom Tucker if (strcmp(xcl->xcl_name, cl->xcl_name) == 0) 961d8206b9STom Tucker goto out; 971d8206b9STom Tucker } 981d8206b9STom Tucker list_add_tail(&xcl->xcl_list, &svc_xprt_class_list); 991d8206b9STom Tucker res = 0; 1001d8206b9STom Tucker out: 1011d8206b9STom Tucker spin_unlock(&svc_xprt_class_lock); 1021d8206b9STom Tucker return res; 1031d8206b9STom Tucker } 1041d8206b9STom Tucker EXPORT_SYMBOL_GPL(svc_reg_xprt_class); 1051d8206b9STom Tucker 106*02cea33fSChuck Lever /** 107*02cea33fSChuck Lever * svc_unreg_xprt_class - Unregister a server-side RPC transport class 108*02cea33fSChuck Lever * @xcl: Transport class to be unregistered 109*02cea33fSChuck Lever * 110*02cea33fSChuck Lever */ 1111d8206b9STom Tucker void svc_unreg_xprt_class(struct svc_xprt_class *xcl) 1121d8206b9STom Tucker { 1131d8206b9STom Tucker dprintk("svc: Removing svc transport class '%s'\n", xcl->xcl_name); 1141d8206b9STom Tucker spin_lock(&svc_xprt_class_lock); 1151d8206b9STom Tucker list_del_init(&xcl->xcl_list); 1161d8206b9STom Tucker spin_unlock(&svc_xprt_class_lock); 1171d8206b9STom Tucker } 1181d8206b9STom Tucker EXPORT_SYMBOL_GPL(svc_unreg_xprt_class); 1191d8206b9STom Tucker 120b25b60d7SChristophe JAILLET /** 121b25b60d7SChristophe JAILLET * svc_print_xprts - Format the transport list for printing 122b25b60d7SChristophe JAILLET * @buf: target buffer for formatted address 123b25b60d7SChristophe JAILLET * @maxlen: length of target buffer 124b25b60d7SChristophe JAILLET * 125b25b60d7SChristophe JAILLET * Fills in @buf with a string containing a list of transport names, each name 126b25b60d7SChristophe JAILLET * terminated with '\n'. If the buffer is too small, some entries may be 127b25b60d7SChristophe JAILLET * missing, but it is guaranteed that all lines in the output buffer are 128b25b60d7SChristophe JAILLET * complete. 129b25b60d7SChristophe JAILLET * 130b25b60d7SChristophe JAILLET * Returns positive length of the filled-in string. 131dc9a16e4STom Tucker */ 132dc9a16e4STom Tucker int svc_print_xprts(char *buf, int maxlen) 133dc9a16e4STom Tucker { 1348f3a6de3SPavel Emelyanov struct svc_xprt_class *xcl; 135dc9a16e4STom Tucker char tmpstr[80]; 136dc9a16e4STom Tucker int len = 0; 137dc9a16e4STom Tucker buf[0] = '\0'; 138dc9a16e4STom Tucker 139dc9a16e4STom Tucker spin_lock(&svc_xprt_class_lock); 1408f3a6de3SPavel Emelyanov list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) { 141dc9a16e4STom Tucker int slen; 142dc9a16e4STom Tucker 143b25b60d7SChristophe JAILLET slen = snprintf(tmpstr, sizeof(tmpstr), "%s %d\n", 144b25b60d7SChristophe JAILLET xcl->xcl_name, xcl->xcl_max_payload); 145b25b60d7SChristophe JAILLET if (slen >= sizeof(tmpstr) || len + slen >= maxlen) 146dc9a16e4STom Tucker break; 147dc9a16e4STom Tucker len += slen; 148dc9a16e4STom Tucker strcat(buf, tmpstr); 149dc9a16e4STom Tucker } 150dc9a16e4STom Tucker spin_unlock(&svc_xprt_class_lock); 151dc9a16e4STom Tucker 152dc9a16e4STom Tucker return len; 153dc9a16e4STom Tucker } 154dc9a16e4STom Tucker 155e844d307SChuck Lever /** 156e844d307SChuck Lever * svc_xprt_deferred_close - Close a transport 157e844d307SChuck Lever * @xprt: transport instance 158e844d307SChuck Lever * 159e844d307SChuck Lever * Used in contexts that need to defer the work of shutting down 160e844d307SChuck Lever * the transport to an nfsd thread. 161e844d307SChuck Lever */ 162e844d307SChuck Lever void svc_xprt_deferred_close(struct svc_xprt *xprt) 163e844d307SChuck Lever { 164e844d307SChuck Lever if (!test_and_set_bit(XPT_CLOSE, &xprt->xpt_flags)) 165e844d307SChuck Lever svc_xprt_enqueue(xprt); 166e844d307SChuck Lever } 167e844d307SChuck Lever EXPORT_SYMBOL_GPL(svc_xprt_deferred_close); 168e844d307SChuck Lever 169e1b3157fSTom Tucker static void svc_xprt_free(struct kref *kref) 170e1b3157fSTom Tucker { 171e1b3157fSTom Tucker struct svc_xprt *xprt = 172e1b3157fSTom Tucker container_of(kref, struct svc_xprt, xpt_ref); 173e1b3157fSTom Tucker struct module *owner = xprt->xpt_class->xcl_owner; 174e3bfca01SPavel Emelyanov if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) 175e3bfca01SPavel Emelyanov svcauth_unix_info_release(xprt); 1764df493a2STrond Myklebust put_cred(xprt->xpt_cred); 1776cdef8a6SEric Dumazet put_net_track(xprt->xpt_net, &xprt->ns_tracker); 17899de8ea9SJ. Bruce Fields /* See comment on corresponding get in xs_setup_bc_tcp(): */ 17999de8ea9SJ. Bruce Fields if (xprt->xpt_bc_xprt) 18099de8ea9SJ. Bruce Fields xprt_put(xprt->xpt_bc_xprt); 18139a9beabSJ. Bruce Fields if (xprt->xpt_bc_xps) 18239a9beabSJ. Bruce Fields xprt_switch_put(xprt->xpt_bc_xps); 18311bbb0f7SChuck Lever trace_svc_xprt_free(xprt); 184e1b3157fSTom Tucker xprt->xpt_ops->xpo_free(xprt); 185e1b3157fSTom Tucker module_put(owner); 186e1b3157fSTom Tucker } 187e1b3157fSTom Tucker 188e1b3157fSTom Tucker void svc_xprt_put(struct svc_xprt *xprt) 189e1b3157fSTom Tucker { 190e1b3157fSTom Tucker kref_put(&xprt->xpt_ref, svc_xprt_free); 191e1b3157fSTom Tucker } 192e1b3157fSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_put); 193e1b3157fSTom Tucker 1941d8206b9STom Tucker /* 1951d8206b9STom Tucker * Called by transport drivers to initialize the transport independent 1961d8206b9STom Tucker * portion of the transport instance. 1971d8206b9STom Tucker */ 198bd4620ddSStanislav Kinsbursky void svc_xprt_init(struct net *net, struct svc_xprt_class *xcl, 199bd4620ddSStanislav Kinsbursky struct svc_xprt *xprt, struct svc_serv *serv) 2001d8206b9STom Tucker { 2011d8206b9STom Tucker memset(xprt, 0, sizeof(*xprt)); 2021d8206b9STom Tucker xprt->xpt_class = xcl; 2031d8206b9STom Tucker xprt->xpt_ops = xcl->xcl_ops; 204e1b3157fSTom Tucker kref_init(&xprt->xpt_ref); 205bb5cf160STom Tucker xprt->xpt_server = serv; 2067a182083STom Tucker INIT_LIST_HEAD(&xprt->xpt_list); 2077a182083STom Tucker INIT_LIST_HEAD(&xprt->xpt_ready); 2088c7b0172STom Tucker INIT_LIST_HEAD(&xprt->xpt_deferred); 209edc7a894SJ. Bruce Fields INIT_LIST_HEAD(&xprt->xpt_users); 210a50fea26STom Tucker mutex_init(&xprt->xpt_mutex); 211def13d74STom Tucker spin_lock_init(&xprt->xpt_lock); 2124e5caaa5STom Tucker set_bit(XPT_BUSY, &xprt->xpt_flags); 2136cdef8a6SEric Dumazet xprt->xpt_net = get_net_track(net, &xprt->ns_tracker, GFP_ATOMIC); 214ece200ddSChuck Lever strcpy(xprt->xpt_remotebuf, "uninitialized"); 2151d8206b9STom Tucker } 2161d8206b9STom Tucker EXPORT_SYMBOL_GPL(svc_xprt_init); 217b700cbb1STom Tucker 2185dd248f6SChuck Lever static struct svc_xprt *__svc_xpo_create(struct svc_xprt_class *xcl, 2195dd248f6SChuck Lever struct svc_serv *serv, 22062832c03SPavel Emelyanov struct net *net, 2219652ada3SChuck Lever const int family, 2229652ada3SChuck Lever const unsigned short port, 2239652ada3SChuck Lever int flags) 224b700cbb1STom Tucker { 225b700cbb1STom Tucker struct sockaddr_in sin = { 226b700cbb1STom Tucker .sin_family = AF_INET, 227e6f1cebfSAl Viro .sin_addr.s_addr = htonl(INADDR_ANY), 228b700cbb1STom Tucker .sin_port = htons(port), 229b700cbb1STom Tucker }; 230dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 2315dd248f6SChuck Lever struct sockaddr_in6 sin6 = { 2325dd248f6SChuck Lever .sin6_family = AF_INET6, 2335dd248f6SChuck Lever .sin6_addr = IN6ADDR_ANY_INIT, 2345dd248f6SChuck Lever .sin6_port = htons(port), 2355dd248f6SChuck Lever }; 236dfd56b8bSEric Dumazet #endif 2374b8f380eSChuck Lever struct svc_xprt *xprt; 2385dd248f6SChuck Lever struct sockaddr *sap; 2395dd248f6SChuck Lever size_t len; 2405dd248f6SChuck Lever 2419652ada3SChuck Lever switch (family) { 2429652ada3SChuck Lever case PF_INET: 2435dd248f6SChuck Lever sap = (struct sockaddr *)&sin; 2445dd248f6SChuck Lever len = sizeof(sin); 2455dd248f6SChuck Lever break; 246dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 2479652ada3SChuck Lever case PF_INET6: 2485dd248f6SChuck Lever sap = (struct sockaddr *)&sin6; 2495dd248f6SChuck Lever len = sizeof(sin6); 2505dd248f6SChuck Lever break; 251dfd56b8bSEric Dumazet #endif 2525dd248f6SChuck Lever default: 2535dd248f6SChuck Lever return ERR_PTR(-EAFNOSUPPORT); 2545dd248f6SChuck Lever } 2555dd248f6SChuck Lever 2564b8f380eSChuck Lever xprt = xcl->xcl_ops->xpo_create(serv, net, sap, len, flags); 2574b8f380eSChuck Lever if (IS_ERR(xprt)) 2584b8f380eSChuck Lever trace_svc_xprt_create_err(serv->sv_program->pg_name, 259dc6c6fb3SChuck Lever xcl->xcl_name, sap, len, xprt); 2604b8f380eSChuck Lever return xprt; 2615dd248f6SChuck Lever } 2625dd248f6SChuck Lever 2637dcfbd86SChuck Lever /** 2647dcfbd86SChuck Lever * svc_xprt_received - start next receiver thread 2657dcfbd86SChuck Lever * @xprt: controlling transport 2667dcfbd86SChuck Lever * 2677dcfbd86SChuck Lever * The caller must hold the XPT_BUSY bit and must 2686741019cSJ. Bruce Fields * not thereafter touch transport data. 2696741019cSJ. Bruce Fields * 2706741019cSJ. Bruce Fields * Note: XPT_DATA only gets cleared when a read-attempt finds no (or 2716741019cSJ. Bruce Fields * insufficient) data. 2726741019cSJ. Bruce Fields */ 2737dcfbd86SChuck Lever void svc_xprt_received(struct svc_xprt *xprt) 2746741019cSJ. Bruce Fields { 275acf06a7fSJeff Layton if (!test_bit(XPT_BUSY, &xprt->xpt_flags)) { 276acf06a7fSJeff Layton WARN_ONCE(1, "xprt=0x%p already busy!", xprt); 277ff1fdb9bSWeston Andros Adamson return; 278acf06a7fSJeff Layton } 279acf06a7fSJeff Layton 2806741019cSJ. Bruce Fields /* As soon as we clear busy, the xprt could be closed and 281c0219c49SChuck Lever * 'put', so we need a reference to call svc_xprt_enqueue with: 2826741019cSJ. Bruce Fields */ 2836741019cSJ. Bruce Fields svc_xprt_get(xprt); 2840971374eSTrond Myklebust smp_mb__before_atomic(); 2856741019cSJ. Bruce Fields clear_bit(XPT_BUSY, &xprt->xpt_flags); 286c0219c49SChuck Lever svc_xprt_enqueue(xprt); 2876741019cSJ. Bruce Fields svc_xprt_put(xprt); 2886741019cSJ. Bruce Fields } 2897dcfbd86SChuck Lever EXPORT_SYMBOL_GPL(svc_xprt_received); 2906741019cSJ. Bruce Fields 29139b55301SJ. Bruce Fields void svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *new) 29239b55301SJ. Bruce Fields { 29339b55301SJ. Bruce Fields clear_bit(XPT_TEMP, &new->xpt_flags); 29439b55301SJ. Bruce Fields spin_lock_bh(&serv->sv_lock); 29539b55301SJ. Bruce Fields list_add(&new->xpt_list, &serv->sv_permsocks); 29639b55301SJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 29739b55301SJ. Bruce Fields svc_xprt_received(new); 29839b55301SJ. Bruce Fields } 29939b55301SJ. Bruce Fields 300352ad314SChuck Lever static int _svc_xprt_create(struct svc_serv *serv, const char *xprt_name, 301fc5d00b0SPavel Emelyanov struct net *net, const int family, 3024df493a2STrond Myklebust const unsigned short port, int flags, 3034df493a2STrond Myklebust const struct cred *cred) 3045dd248f6SChuck Lever { 3055dd248f6SChuck Lever struct svc_xprt_class *xcl; 3065dd248f6SChuck Lever 307b700cbb1STom Tucker spin_lock(&svc_xprt_class_lock); 308b700cbb1STom Tucker list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) { 309b700cbb1STom Tucker struct svc_xprt *newxprt; 310ed2849d3SNeilBrown unsigned short newport; 3114e5caaa5STom Tucker 3124e5caaa5STom Tucker if (strcmp(xprt_name, xcl->xcl_name)) 3134e5caaa5STom Tucker continue; 3144e5caaa5STom Tucker 3154e5caaa5STom Tucker if (!try_module_get(xcl->xcl_owner)) 3164e5caaa5STom Tucker goto err; 3174e5caaa5STom Tucker 3184e5caaa5STom Tucker spin_unlock(&svc_xprt_class_lock); 31962832c03SPavel Emelyanov newxprt = __svc_xpo_create(xcl, serv, net, family, port, flags); 320b700cbb1STom Tucker if (IS_ERR(newxprt)) { 321b700cbb1STom Tucker module_put(xcl->xcl_owner); 3224e5caaa5STom Tucker return PTR_ERR(newxprt); 323b700cbb1STom Tucker } 3244df493a2STrond Myklebust newxprt->xpt_cred = get_cred(cred); 32539b55301SJ. Bruce Fields svc_add_new_perm_xprt(serv, newxprt); 326ed2849d3SNeilBrown newport = svc_xprt_local_port(newxprt); 327ed2849d3SNeilBrown return newport; 328b700cbb1STom Tucker } 3294e5caaa5STom Tucker err: 330b700cbb1STom Tucker spin_unlock(&svc_xprt_class_lock); 33168717908SChuck Lever /* This errno is exposed to user space. Provide a reasonable 33268717908SChuck Lever * perror msg for a bad transport. */ 33368717908SChuck Lever return -EPROTONOSUPPORT; 334b700cbb1STom Tucker } 335d96b9c93SJ. Bruce Fields 336352ad314SChuck Lever /** 337352ad314SChuck Lever * svc_xprt_create - Add a new listener to @serv 338352ad314SChuck Lever * @serv: target RPC service 339352ad314SChuck Lever * @xprt_name: transport class name 340352ad314SChuck Lever * @net: network namespace 341352ad314SChuck Lever * @family: network address family 342352ad314SChuck Lever * @port: listener port 343352ad314SChuck Lever * @flags: SVC_SOCK flags 344352ad314SChuck Lever * @cred: credential to bind to this transport 345352ad314SChuck Lever * 346352ad314SChuck Lever * Return values: 347352ad314SChuck Lever * %0: New listener added successfully 348352ad314SChuck Lever * %-EPROTONOSUPPORT: Requested transport type not supported 349352ad314SChuck Lever */ 350352ad314SChuck Lever int svc_xprt_create(struct svc_serv *serv, const char *xprt_name, 351d96b9c93SJ. Bruce Fields struct net *net, const int family, 3524df493a2STrond Myklebust const unsigned short port, int flags, 3534df493a2STrond Myklebust const struct cred *cred) 354d96b9c93SJ. Bruce Fields { 355d96b9c93SJ. Bruce Fields int err; 356d96b9c93SJ. Bruce Fields 357352ad314SChuck Lever err = _svc_xprt_create(serv, xprt_name, net, family, port, flags, cred); 358d96b9c93SJ. Bruce Fields if (err == -EPROTONOSUPPORT) { 359d96b9c93SJ. Bruce Fields request_module("svc%s", xprt_name); 360352ad314SChuck Lever err = _svc_xprt_create(serv, xprt_name, net, family, port, flags, cred); 361d96b9c93SJ. Bruce Fields } 362d96b9c93SJ. Bruce Fields return err; 363d96b9c93SJ. Bruce Fields } 364352ad314SChuck Lever EXPORT_SYMBOL_GPL(svc_xprt_create); 3659dbc240fSTom Tucker 3669dbc240fSTom Tucker /* 3679dbc240fSTom Tucker * Copy the local and remote xprt addresses to the rqstp structure 3689dbc240fSTom Tucker */ 3699dbc240fSTom Tucker void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt) 3709dbc240fSTom Tucker { 3719dbc240fSTom Tucker memcpy(&rqstp->rq_addr, &xprt->xpt_remote, xprt->xpt_remotelen); 3729dbc240fSTom Tucker rqstp->rq_addrlen = xprt->xpt_remotelen; 3739dbc240fSTom Tucker 3749dbc240fSTom Tucker /* 3759dbc240fSTom Tucker * Destination address in request is needed for binding the 3769dbc240fSTom Tucker * source address in RPC replies/callbacks later. 3779dbc240fSTom Tucker */ 378849a1cf1SMi Jinlong memcpy(&rqstp->rq_daddr, &xprt->xpt_local, xprt->xpt_locallen); 379849a1cf1SMi Jinlong rqstp->rq_daddrlen = xprt->xpt_locallen; 3809dbc240fSTom Tucker } 3819dbc240fSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs); 3829dbc240fSTom Tucker 3830f0257eaSTom Tucker /** 3840f0257eaSTom Tucker * svc_print_addr - Format rq_addr field for printing 3850f0257eaSTom Tucker * @rqstp: svc_rqst struct containing address to print 3860f0257eaSTom Tucker * @buf: target buffer for formatted address 3870f0257eaSTom Tucker * @len: length of target buffer 3880f0257eaSTom Tucker * 3890f0257eaSTom Tucker */ 3900f0257eaSTom Tucker char *svc_print_addr(struct svc_rqst *rqstp, char *buf, size_t len) 3910f0257eaSTom Tucker { 3920f0257eaSTom Tucker return __svc_print_addr(svc_addr(rqstp), buf, len); 3930f0257eaSTom Tucker } 3940f0257eaSTom Tucker EXPORT_SYMBOL_GPL(svc_print_addr); 3950f0257eaSTom Tucker 396ff3ac5c3STrond Myklebust static bool svc_xprt_slots_in_range(struct svc_xprt *xprt) 397ff3ac5c3STrond Myklebust { 398ff3ac5c3STrond Myklebust unsigned int limit = svc_rpc_per_connection_limit; 399ff3ac5c3STrond Myklebust int nrqsts = atomic_read(&xprt->xpt_nr_rqsts); 400ff3ac5c3STrond Myklebust 401ff3ac5c3STrond Myklebust return limit == 0 || (nrqsts >= 0 && nrqsts < limit); 402ff3ac5c3STrond Myklebust } 403ff3ac5c3STrond Myklebust 404ff3ac5c3STrond Myklebust static bool svc_xprt_reserve_slot(struct svc_rqst *rqstp, struct svc_xprt *xprt) 405ff3ac5c3STrond Myklebust { 406ff3ac5c3STrond Myklebust if (!test_bit(RQ_DATA, &rqstp->rq_flags)) { 407ff3ac5c3STrond Myklebust if (!svc_xprt_slots_in_range(xprt)) 408ff3ac5c3STrond Myklebust return false; 409ff3ac5c3STrond Myklebust atomic_inc(&xprt->xpt_nr_rqsts); 410ff3ac5c3STrond Myklebust set_bit(RQ_DATA, &rqstp->rq_flags); 411ff3ac5c3STrond Myklebust } 412ff3ac5c3STrond Myklebust return true; 413ff3ac5c3STrond Myklebust } 414ff3ac5c3STrond Myklebust 415ff3ac5c3STrond Myklebust static void svc_xprt_release_slot(struct svc_rqst *rqstp) 416ff3ac5c3STrond Myklebust { 417ff3ac5c3STrond Myklebust struct svc_xprt *xprt = rqstp->rq_xprt; 418ff3ac5c3STrond Myklebust if (test_and_clear_bit(RQ_DATA, &rqstp->rq_flags)) { 419ff3ac5c3STrond Myklebust atomic_dec(&xprt->xpt_nr_rqsts); 42095503d29SJ. Bruce Fields smp_wmb(); /* See smp_rmb() in svc_xprt_ready() */ 421ff3ac5c3STrond Myklebust svc_xprt_enqueue(xprt); 422ff3ac5c3STrond Myklebust } 423ff3ac5c3STrond Myklebust } 424ff3ac5c3STrond Myklebust 42566c898caSJ. Bruce Fields static bool svc_xprt_ready(struct svc_xprt *xprt) 4269c335c0bSJ. Bruce Fields { 4271602a7b7STrond Myklebust unsigned long xpt_flags; 4281602a7b7STrond Myklebust 42995503d29SJ. Bruce Fields /* 43095503d29SJ. Bruce Fields * If another cpu has recently updated xpt_flags, 43195503d29SJ. Bruce Fields * sk_sock->flags, xpt_reserved, or xpt_nr_rqsts, we need to 43295503d29SJ. Bruce Fields * know about it; otherwise it's possible that both that cpu and 43395503d29SJ. Bruce Fields * this one could call svc_xprt_enqueue() without either 43495503d29SJ. Bruce Fields * svc_xprt_enqueue() recognizing that the conditions below 43595503d29SJ. Bruce Fields * are satisfied, and we could stall indefinitely: 43695503d29SJ. Bruce Fields */ 43795503d29SJ. Bruce Fields smp_rmb(); 4381602a7b7STrond Myklebust xpt_flags = READ_ONCE(xprt->xpt_flags); 4391602a7b7STrond Myklebust 440c0219c49SChuck Lever if (xpt_flags & BIT(XPT_BUSY)) 441c0219c49SChuck Lever return false; 442b3cbf98eSChuck Lever if (xpt_flags & (BIT(XPT_CONN) | BIT(XPT_CLOSE) | BIT(XPT_HANDSHAKE))) 4439c335c0bSJ. Bruce Fields return true; 4441602a7b7STrond Myklebust if (xpt_flags & (BIT(XPT_DATA) | BIT(XPT_DEFERRED))) { 445ff3ac5c3STrond Myklebust if (xprt->xpt_ops->xpo_has_wspace(xprt) && 446ff3ac5c3STrond Myklebust svc_xprt_slots_in_range(xprt)) 44782ea2d76STrond Myklebust return true; 44882ea2d76STrond Myklebust trace_svc_xprt_no_write_space(xprt); 44982ea2d76STrond Myklebust return false; 45082ea2d76STrond Myklebust } 4519c335c0bSJ. Bruce Fields return false; 4529c335c0bSJ. Bruce Fields } 4539c335c0bSJ. Bruce Fields 454c0219c49SChuck Lever /** 455c0219c49SChuck Lever * svc_xprt_enqueue - Queue a transport on an idle nfsd thread 456c0219c49SChuck Lever * @xprt: transport with data pending 457c0219c49SChuck Lever * 458c0219c49SChuck Lever */ 459c0219c49SChuck Lever void svc_xprt_enqueue(struct svc_xprt *xprt) 4600f0257eaSTom Tucker { 4610f0257eaSTom Tucker struct svc_pool *pool; 46283a712e0SJeff Layton struct svc_rqst *rqstp = NULL; 4630f0257eaSTom Tucker 46466c898caSJ. Bruce Fields if (!svc_xprt_ready(xprt)) 4657dbb53baSChuck Lever return; 4660f0257eaSTom Tucker 4670f0257eaSTom Tucker /* Mark transport as busy. It will remain in this state until 4680f0257eaSTom Tucker * the provider calls svc_xprt_received. We update XPT_BUSY 4690f0257eaSTom Tucker * atomically because it also guards against trying to enqueue 4700f0257eaSTom Tucker * the transport twice. 4710f0257eaSTom Tucker */ 4727dbb53baSChuck Lever if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) 4737dbb53baSChuck Lever return; 4740f0257eaSTom Tucker 4752059b698SChuck Lever pool = svc_pool_for_cpu(xprt->xpt_server); 4760c0746d0STrond Myklebust 477ccf08bedSChuck Lever percpu_counter_inc(&pool->sp_sockets_queued); 478b1691bc0SJeff Layton spin_lock_bh(&pool->sp_lock); 479b1691bc0SJeff Layton list_add_tail(&xprt->xpt_ready, &pool->sp_sockets); 4800f0257eaSTom Tucker spin_unlock_bh(&pool->sp_lock); 48122700f3cSTrond Myklebust 48222700f3cSTrond Myklebust /* find a thread for this xprt */ 48322700f3cSTrond Myklebust rcu_read_lock(); 48422700f3cSTrond Myklebust list_for_each_entry_rcu(rqstp, &pool->sp_all_threads, rq_all) { 48522700f3cSTrond Myklebust if (test_and_set_bit(RQ_BUSY, &rqstp->rq_flags)) 48622700f3cSTrond Myklebust continue; 487ccf08bedSChuck Lever percpu_counter_inc(&pool->sp_threads_woken); 48855f5088cSChuck Lever rqstp->rq_qtime = ktime_get(); 48922700f3cSTrond Myklebust wake_up_process(rqstp->rq_task); 49022700f3cSTrond Myklebust goto out_unlock; 491b1691bc0SJeff Layton } 49222700f3cSTrond Myklebust set_bit(SP_CONGESTED, &pool->sp_flags); 49383a712e0SJeff Layton rqstp = NULL; 49422700f3cSTrond Myklebust out_unlock: 49522700f3cSTrond Myklebust rcu_read_unlock(); 4965089f3d9SChuck Lever trace_svc_xprt_enqueue(xprt, rqstp); 4970f0257eaSTom Tucker } 4980f0257eaSTom Tucker EXPORT_SYMBOL_GPL(svc_xprt_enqueue); 4990f0257eaSTom Tucker 5000f0257eaSTom Tucker /* 501b1691bc0SJeff Layton * Dequeue the first transport, if there is one. 5020f0257eaSTom Tucker */ 5030f0257eaSTom Tucker static struct svc_xprt *svc_xprt_dequeue(struct svc_pool *pool) 5040f0257eaSTom Tucker { 505b1691bc0SJeff Layton struct svc_xprt *xprt = NULL; 5060f0257eaSTom Tucker 5070f0257eaSTom Tucker if (list_empty(&pool->sp_sockets)) 50883a712e0SJeff Layton goto out; 5090f0257eaSTom Tucker 510b1691bc0SJeff Layton spin_lock_bh(&pool->sp_lock); 511b1691bc0SJeff Layton if (likely(!list_empty(&pool->sp_sockets))) { 512b1691bc0SJeff Layton xprt = list_first_entry(&pool->sp_sockets, 5130f0257eaSTom Tucker struct svc_xprt, xpt_ready); 5140f0257eaSTom Tucker list_del_init(&xprt->xpt_ready); 515b1691bc0SJeff Layton svc_xprt_get(xprt); 516b1691bc0SJeff Layton } 517b1691bc0SJeff Layton spin_unlock_bh(&pool->sp_lock); 51883a712e0SJeff Layton out: 5190f0257eaSTom Tucker return xprt; 5200f0257eaSTom Tucker } 5210f0257eaSTom Tucker 5220f0257eaSTom Tucker /** 5230f0257eaSTom Tucker * svc_reserve - change the space reserved for the reply to a request. 5240f0257eaSTom Tucker * @rqstp: The request in question 5250f0257eaSTom Tucker * @space: new max space to reserve 5260f0257eaSTom Tucker * 5270f0257eaSTom Tucker * Each request reserves some space on the output queue of the transport 5280f0257eaSTom Tucker * to make sure the reply fits. This function reduces that reserved 5290f0257eaSTom Tucker * space to be the amount of space used already, plus @space. 5300f0257eaSTom Tucker * 5310f0257eaSTom Tucker */ 5320f0257eaSTom Tucker void svc_reserve(struct svc_rqst *rqstp, int space) 5330f0257eaSTom Tucker { 534d4b09acfSVasily Averin struct svc_xprt *xprt = rqstp->rq_xprt; 535d4b09acfSVasily Averin 5360f0257eaSTom Tucker space += rqstp->rq_res.head[0].iov_len; 5370f0257eaSTom Tucker 538d4b09acfSVasily Averin if (xprt && space < rqstp->rq_reserved) { 5390f0257eaSTom Tucker atomic_sub((rqstp->rq_reserved - space), &xprt->xpt_reserved); 5400f0257eaSTom Tucker rqstp->rq_reserved = space; 54195503d29SJ. Bruce Fields smp_wmb(); /* See smp_rmb() in svc_xprt_ready() */ 5420f0257eaSTom Tucker svc_xprt_enqueue(xprt); 5430f0257eaSTom Tucker } 5440f0257eaSTom Tucker } 54524c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_reserve); 5460f0257eaSTom Tucker 547948f072aSNeilBrown static void free_deferred(struct svc_xprt *xprt, struct svc_deferred_req *dr) 548948f072aSNeilBrown { 549948f072aSNeilBrown if (!dr) 550948f072aSNeilBrown return; 551948f072aSNeilBrown 552948f072aSNeilBrown xprt->xpt_ops->xpo_release_ctxt(xprt, dr->xprt_ctxt); 553948f072aSNeilBrown kfree(dr); 554948f072aSNeilBrown } 555948f072aSNeilBrown 5560f0257eaSTom Tucker static void svc_xprt_release(struct svc_rqst *rqstp) 5570f0257eaSTom Tucker { 5580f0257eaSTom Tucker struct svc_xprt *xprt = rqstp->rq_xprt; 5590f0257eaSTom Tucker 560948f072aSNeilBrown xprt->xpt_ops->xpo_release_ctxt(xprt, rqstp->rq_xprt_ctxt); 561948f072aSNeilBrown rqstp->rq_xprt_ctxt = NULL; 5620f0257eaSTom Tucker 563948f072aSNeilBrown free_deferred(xprt, rqstp->rq_deferred); 5642779e3aeSTom Tucker rqstp->rq_deferred = NULL; 5652779e3aeSTom Tucker 566b20cb39dSChuck Lever svc_rqst_release_pages(rqstp); 5670f0257eaSTom Tucker rqstp->rq_res.page_len = 0; 5680f0257eaSTom Tucker rqstp->rq_res.page_base = 0; 5690f0257eaSTom Tucker 5700f0257eaSTom Tucker /* Reset response buffer and release 5710f0257eaSTom Tucker * the reservation. 5720f0257eaSTom Tucker * But first, check that enough space was reserved 5730f0257eaSTom Tucker * for the reply, otherwise we have a bug! 5740f0257eaSTom Tucker */ 5750f0257eaSTom Tucker if ((rqstp->rq_res.len) > rqstp->rq_reserved) 5760f0257eaSTom Tucker printk(KERN_ERR "RPC request reserved %d but used %d\n", 5770f0257eaSTom Tucker rqstp->rq_reserved, 5780f0257eaSTom Tucker rqstp->rq_res.len); 5790f0257eaSTom Tucker 5800f0257eaSTom Tucker rqstp->rq_res.head[0].iov_len = 0; 5810f0257eaSTom Tucker svc_reserve(rqstp, 0); 582ff3ac5c3STrond Myklebust svc_xprt_release_slot(rqstp); 5830f0257eaSTom Tucker rqstp->rq_xprt = NULL; 5840f0257eaSTom Tucker svc_xprt_put(xprt); 5850f0257eaSTom Tucker } 5860f0257eaSTom Tucker 5870f0257eaSTom Tucker /* 588ceff739cSJeff Layton * Some svc_serv's will have occasional work to do, even when a xprt is not 589ceff739cSJeff Layton * waiting to be serviced. This function is there to "kick" a task in one of 590ceff739cSJeff Layton * those services so that it can wake up and do that work. Note that we only 591ceff739cSJeff Layton * bother with pool 0 as we don't need to wake up more than one thread for 592ceff739cSJeff Layton * this purpose. 5930f0257eaSTom Tucker */ 5940f0257eaSTom Tucker void svc_wake_up(struct svc_serv *serv) 5950f0257eaSTom Tucker { 5960f0257eaSTom Tucker struct svc_rqst *rqstp; 5970f0257eaSTom Tucker struct svc_pool *pool; 5980f0257eaSTom Tucker 599ceff739cSJeff Layton pool = &serv->sv_pools[0]; 6000f0257eaSTom Tucker 601b1691bc0SJeff Layton rcu_read_lock(); 602b1691bc0SJeff Layton list_for_each_entry_rcu(rqstp, &pool->sp_all_threads, rq_all) { 603b1691bc0SJeff Layton /* skip any that aren't queued */ 604b1691bc0SJeff Layton if (test_bit(RQ_BUSY, &rqstp->rq_flags)) 605b1691bc0SJeff Layton continue; 606b1691bc0SJeff Layton rcu_read_unlock(); 607983c6844STrond Myklebust wake_up_process(rqstp->rq_task); 60883a712e0SJeff Layton trace_svc_wake_up(rqstp->rq_task->pid); 609b1691bc0SJeff Layton return; 610b1691bc0SJeff Layton } 611b1691bc0SJeff Layton rcu_read_unlock(); 612b1691bc0SJeff Layton 613b1691bc0SJeff Layton /* No free entries available */ 6144d5db3f5SJeff Layton set_bit(SP_TASK_PENDING, &pool->sp_flags); 615b1691bc0SJeff Layton smp_wmb(); 61683a712e0SJeff Layton trace_svc_wake_up(0); 6170f0257eaSTom Tucker } 61824c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_wake_up); 6190f0257eaSTom Tucker 6200f0257eaSTom Tucker int svc_port_is_privileged(struct sockaddr *sin) 6210f0257eaSTom Tucker { 6220f0257eaSTom Tucker switch (sin->sa_family) { 6230f0257eaSTom Tucker case AF_INET: 6240f0257eaSTom Tucker return ntohs(((struct sockaddr_in *)sin)->sin_port) 6250f0257eaSTom Tucker < PROT_SOCK; 6260f0257eaSTom Tucker case AF_INET6: 6270f0257eaSTom Tucker return ntohs(((struct sockaddr_in6 *)sin)->sin6_port) 6280f0257eaSTom Tucker < PROT_SOCK; 6290f0257eaSTom Tucker default: 6300f0257eaSTom Tucker return 0; 6310f0257eaSTom Tucker } 6320f0257eaSTom Tucker } 6330f0257eaSTom Tucker 6340f0257eaSTom Tucker /* 635c9233eb7SJeff Layton * Make sure that we don't have too many active connections. If we have, 636c9233eb7SJeff Layton * something must be dropped. It's not clear what will happen if we allow 637c9233eb7SJeff Layton * "too many" connections, but when dealing with network-facing software, 638c9233eb7SJeff Layton * we have to code defensively. Here we do that by imposing hard limits. 6390f0257eaSTom Tucker * 6400f0257eaSTom Tucker * There's no point in trying to do random drop here for DoS 6410f0257eaSTom Tucker * prevention. The NFS clients does 1 reconnect in 15 seconds. An 6420f0257eaSTom Tucker * attacker can easily beat that. 6430f0257eaSTom Tucker * 6440f0257eaSTom Tucker * The only somewhat efficient mechanism would be if drop old 6450f0257eaSTom Tucker * connections from the same IP first. But right now we don't even 6460f0257eaSTom Tucker * record the client IP in svc_sock. 647c9233eb7SJeff Layton * 648c9233eb7SJeff Layton * single-threaded services that expect a lot of clients will probably 649c9233eb7SJeff Layton * need to set sv_maxconn to override the default value which is based 650c9233eb7SJeff Layton * on the number of threads 6510f0257eaSTom Tucker */ 6520f0257eaSTom Tucker static void svc_check_conn_limits(struct svc_serv *serv) 6530f0257eaSTom Tucker { 654c9233eb7SJeff Layton unsigned int limit = serv->sv_maxconn ? serv->sv_maxconn : 655c9233eb7SJeff Layton (serv->sv_nrthreads+3) * 20; 656c9233eb7SJeff Layton 657c9233eb7SJeff Layton if (serv->sv_tmpcnt > limit) { 6580f0257eaSTom Tucker struct svc_xprt *xprt = NULL; 6590f0257eaSTom Tucker spin_lock_bh(&serv->sv_lock); 6600f0257eaSTom Tucker if (!list_empty(&serv->sv_tempsocks)) { 6610f0257eaSTom Tucker /* Try to help the admin */ 662e87cc472SJoe Perches net_notice_ratelimited("%s: too many open connections, consider increasing the %s\n", 663c9233eb7SJeff Layton serv->sv_name, serv->sv_maxconn ? 664e87cc472SJoe Perches "max number of connections" : 665e87cc472SJoe Perches "number of threads"); 6660f0257eaSTom Tucker /* 6670f0257eaSTom Tucker * Always select the oldest connection. It's not fair, 6680f0257eaSTom Tucker * but so is life 6690f0257eaSTom Tucker */ 6700f0257eaSTom Tucker xprt = list_entry(serv->sv_tempsocks.prev, 6710f0257eaSTom Tucker struct svc_xprt, 6720f0257eaSTom Tucker xpt_list); 6730f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 6740f0257eaSTom Tucker svc_xprt_get(xprt); 6750f0257eaSTom Tucker } 6760f0257eaSTom Tucker spin_unlock_bh(&serv->sv_lock); 6770f0257eaSTom Tucker 6780f0257eaSTom Tucker if (xprt) { 6790f0257eaSTom Tucker svc_xprt_enqueue(xprt); 6800f0257eaSTom Tucker svc_xprt_put(xprt); 6810f0257eaSTom Tucker } 6820f0257eaSTom Tucker } 6830f0257eaSTom Tucker } 6840f0257eaSTom Tucker 685e1d83ee6SRashika Kheria static int svc_alloc_arg(struct svc_rqst *rqstp) 6860f0257eaSTom Tucker { 6870f0257eaSTom Tucker struct svc_serv *serv = rqstp->rq_server; 688ab836264SChuck Lever struct xdr_buf *arg = &rqstp->rq_arg; 689e38b3f20SNeilBrown unsigned long pages, filled, ret; 6900f0257eaSTom Tucker 6918c6ae498SChuck Lever pages = (serv->sv_max_mesg + 2 * PAGE_SIZE) >> PAGE_SHIFT; 6928c6ae498SChuck Lever if (pages > RPCSVC_MAXPAGES) { 693f6e70aabSChuck Lever pr_warn_once("svc: warning: pages=%lu > RPCSVC_MAXPAGES=%lu\n", 6948c6ae498SChuck Lever pages, RPCSVC_MAXPAGES); 695b25cd058SWeston Andros Adamson /* use as many pages as possible */ 6968c6ae498SChuck Lever pages = RPCSVC_MAXPAGES; 6978c6ae498SChuck Lever } 698f6e70aabSChuck Lever 699e38b3f20SNeilBrown for (filled = 0; filled < pages; filled = ret) { 7005f7fc5d6SChuck Lever ret = alloc_pages_bulk_array_node(GFP_KERNEL, 7015f7fc5d6SChuck Lever rqstp->rq_pool->sp_id, 7025f7fc5d6SChuck Lever pages, rqstp->rq_pages); 703e38b3f20SNeilBrown if (ret > filled) 704e38b3f20SNeilBrown /* Made progress, don't sleep yet */ 705e38b3f20SNeilBrown continue; 706f6e70aabSChuck Lever 7077b54fe61SJeff Layton set_current_state(TASK_INTERRUPTIBLE); 7087b54fe61SJeff Layton if (signalled() || kthread_should_stop()) { 7097b54fe61SJeff Layton set_current_state(TASK_RUNNING); 7107086721fSJeff Layton return -EINTR; 7117b54fe61SJeff Layton } 71228fffa6cSChuck Lever trace_svc_alloc_arg_err(pages, ret); 7134034247aSNeilBrown memalloc_retry_wait(GFP_KERNEL); 7140f0257eaSTom Tucker } 715ab836264SChuck Lever rqstp->rq_page_end = &rqstp->rq_pages[pages]; 716ab836264SChuck Lever rqstp->rq_pages[pages] = NULL; /* this might be seen in nfsd_splice_actor() */ 7170f0257eaSTom Tucker 7180f0257eaSTom Tucker /* Make arg->head point to first page and arg->pages point to rest */ 7190f0257eaSTom Tucker arg->head[0].iov_base = page_address(rqstp->rq_pages[0]); 7200f0257eaSTom Tucker arg->head[0].iov_len = PAGE_SIZE; 7210f0257eaSTom Tucker arg->pages = rqstp->rq_pages + 1; 7220f0257eaSTom Tucker arg->page_base = 0; 7230f0257eaSTom Tucker /* save at least one page for response */ 7240f0257eaSTom Tucker arg->page_len = (pages-2)*PAGE_SIZE; 7250f0257eaSTom Tucker arg->len = (pages-1)*PAGE_SIZE; 7260f0257eaSTom Tucker arg->tail[0].iov_len = 0; 727695bc1f3SChuck Lever 728695bc1f3SChuck Lever rqstp->rq_xid = xdr_zero; 7296797fa5aSJ. Bruce Fields return 0; 7306797fa5aSJ. Bruce Fields } 7310f0257eaSTom Tucker 732b1691bc0SJeff Layton static bool 733b1691bc0SJeff Layton rqst_should_sleep(struct svc_rqst *rqstp) 734b1691bc0SJeff Layton { 735b1691bc0SJeff Layton struct svc_pool *pool = rqstp->rq_pool; 736b1691bc0SJeff Layton 737b1691bc0SJeff Layton /* did someone call svc_wake_up? */ 738b1691bc0SJeff Layton if (test_and_clear_bit(SP_TASK_PENDING, &pool->sp_flags)) 739b1691bc0SJeff Layton return false; 740b1691bc0SJeff Layton 741b1691bc0SJeff Layton /* was a socket queued? */ 742b1691bc0SJeff Layton if (!list_empty(&pool->sp_sockets)) 743b1691bc0SJeff Layton return false; 744b1691bc0SJeff Layton 745b1691bc0SJeff Layton /* are we shutting down? */ 746b1691bc0SJeff Layton if (signalled() || kthread_should_stop()) 747b1691bc0SJeff Layton return false; 748b1691bc0SJeff Layton 749b1691bc0SJeff Layton /* are we freezing? */ 750b1691bc0SJeff Layton if (freezing(current)) 751b1691bc0SJeff Layton return false; 752b1691bc0SJeff Layton 753b1691bc0SJeff Layton return true; 754b1691bc0SJeff Layton } 755b1691bc0SJeff Layton 756e1d83ee6SRashika Kheria static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout) 7576797fa5aSJ. Bruce Fields { 7586797fa5aSJ. Bruce Fields struct svc_pool *pool = rqstp->rq_pool; 759a4aa8054STrond Myklebust long time_left = 0; 7600f0257eaSTom Tucker 761b1691bc0SJeff Layton /* rq_xprt should be clear on entry */ 762b1691bc0SJeff Layton WARN_ON_ONCE(rqstp->rq_xprt); 763b1691bc0SJeff Layton 76422700f3cSTrond Myklebust rqstp->rq_xprt = svc_xprt_dequeue(pool); 76522700f3cSTrond Myklebust if (rqstp->rq_xprt) 76622700f3cSTrond Myklebust goto out_found; 767b1691bc0SJeff Layton 7680f0257eaSTom Tucker /* 7690f0257eaSTom Tucker * We have to be able to interrupt this wait 7700f0257eaSTom Tucker * to bring down the daemons ... 7710f0257eaSTom Tucker */ 7720f0257eaSTom Tucker set_current_state(TASK_INTERRUPTIBLE); 77322700f3cSTrond Myklebust smp_mb__before_atomic(); 77422700f3cSTrond Myklebust clear_bit(SP_CONGESTED, &pool->sp_flags); 775b1691bc0SJeff Layton clear_bit(RQ_BUSY, &rqstp->rq_flags); 77622700f3cSTrond Myklebust smp_mb__after_atomic(); 7777086721fSJeff Layton 778b1691bc0SJeff Layton if (likely(rqst_should_sleep(rqstp))) 77903cf6c9fSGreg Banks time_left = schedule_timeout(timeout); 780b1691bc0SJeff Layton else 781983c6844STrond Myklebust __set_current_state(TASK_RUNNING); 7820f0257eaSTom Tucker 7830f0257eaSTom Tucker try_to_freeze(); 7840f0257eaSTom Tucker 785b1691bc0SJeff Layton set_bit(RQ_BUSY, &rqstp->rq_flags); 78622700f3cSTrond Myklebust smp_mb__after_atomic(); 78722700f3cSTrond Myklebust rqstp->rq_xprt = svc_xprt_dequeue(pool); 78822700f3cSTrond Myklebust if (rqstp->rq_xprt) 78922700f3cSTrond Myklebust goto out_found; 790106f359cSTrond Myklebust 79103cf6c9fSGreg Banks if (!time_left) 792ccf08bedSChuck Lever percpu_counter_inc(&pool->sp_threads_timedout); 7930f0257eaSTom Tucker 7947086721fSJeff Layton if (signalled() || kthread_should_stop()) 7956797fa5aSJ. Bruce Fields return ERR_PTR(-EINTR); 7966797fa5aSJ. Bruce Fields return ERR_PTR(-EAGAIN); 79722700f3cSTrond Myklebust out_found: 79822700f3cSTrond Myklebust /* Normally we will wait up to 5 seconds for any required 79922700f3cSTrond Myklebust * cache information to be provided. 80022700f3cSTrond Myklebust */ 80122700f3cSTrond Myklebust if (!test_bit(SP_CONGESTED, &pool->sp_flags)) 80222700f3cSTrond Myklebust rqstp->rq_chandle.thread_wait = 5*HZ; 80322700f3cSTrond Myklebust else 80422700f3cSTrond Myklebust rqstp->rq_chandle.thread_wait = 1*HZ; 80555f5088cSChuck Lever trace_svc_xprt_dequeue(rqstp); 80622700f3cSTrond Myklebust return rqstp->rq_xprt; 8070f0257eaSTom Tucker } 8080f0257eaSTom Tucker 809e1d83ee6SRashika Kheria static void svc_add_new_temp_xprt(struct svc_serv *serv, struct svc_xprt *newxpt) 81065b2e665SJ. Bruce Fields { 81165b2e665SJ. Bruce Fields spin_lock_bh(&serv->sv_lock); 81265b2e665SJ. Bruce Fields set_bit(XPT_TEMP, &newxpt->xpt_flags); 81365b2e665SJ. Bruce Fields list_add(&newxpt->xpt_list, &serv->sv_tempsocks); 81465b2e665SJ. Bruce Fields serv->sv_tmpcnt++; 81565b2e665SJ. Bruce Fields if (serv->sv_temptimer.function == NULL) { 81665b2e665SJ. Bruce Fields /* setup timer to age temp transports */ 817841b86f3SKees Cook serv->sv_temptimer.function = svc_age_temp_xprts; 81865b2e665SJ. Bruce Fields mod_timer(&serv->sv_temptimer, 81965b2e665SJ. Bruce Fields jiffies + svc_conn_age_period * HZ); 82065b2e665SJ. Bruce Fields } 82165b2e665SJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 82265b2e665SJ. Bruce Fields svc_xprt_received(newxpt); 82365b2e665SJ. Bruce Fields } 82465b2e665SJ. Bruce Fields 8256797fa5aSJ. Bruce Fields static int svc_handle_xprt(struct svc_rqst *rqstp, struct svc_xprt *xprt) 8266797fa5aSJ. Bruce Fields { 8276797fa5aSJ. Bruce Fields struct svc_serv *serv = rqstp->rq_server; 8286797fa5aSJ. Bruce Fields int len = 0; 8296797fa5aSJ. Bruce Fields 8301b644b6eSJ. Bruce Fields if (test_bit(XPT_CLOSE, &xprt->xpt_flags)) { 831546125d1SScott Mayhew if (test_and_clear_bit(XPT_KILL_TEMP, &xprt->xpt_flags)) 832546125d1SScott Mayhew xprt->xpt_ops->xpo_kill_temp_xprt(xprt); 8331b644b6eSJ. Bruce Fields svc_delete_xprt(xprt); 834ca7896cdSJ. Bruce Fields /* Leave XPT_BUSY set on the dead xprt: */ 83583a712e0SJeff Layton goto out; 836ca7896cdSJ. Bruce Fields } 837ca7896cdSJ. Bruce Fields if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) { 8380f0257eaSTom Tucker struct svc_xprt *newxpt; 8390f0257eaSTom Tucker /* 8400f0257eaSTom Tucker * We know this module_get will succeed because the 8410f0257eaSTom Tucker * listener holds a reference too 8420f0257eaSTom Tucker */ 84365b2e665SJ. Bruce Fields __module_get(xprt->xpt_class->xcl_owner); 8440f0257eaSTom Tucker svc_check_conn_limits(xprt->xpt_server); 84565b2e665SJ. Bruce Fields newxpt = xprt->xpt_ops->xpo_accept(xprt); 8461237d354STrond Myklebust if (newxpt) { 8471237d354STrond Myklebust newxpt->xpt_cred = get_cred(xprt->xpt_cred); 84865b2e665SJ. Bruce Fields svc_add_new_temp_xprt(serv, newxpt); 84911bbb0f7SChuck Lever trace_svc_xprt_accept(newxpt, serv->sv_name); 85082011c80SChuck Lever } else { 851c789102cSTrond Myklebust module_put(xprt->xpt_class->xcl_owner); 85282011c80SChuck Lever } 85382011c80SChuck Lever svc_xprt_received(xprt); 854b3cbf98eSChuck Lever } else if (test_bit(XPT_HANDSHAKE, &xprt->xpt_flags)) { 855b3cbf98eSChuck Lever xprt->xpt_ops->xpo_handshake(xprt); 856b3cbf98eSChuck Lever svc_xprt_received(xprt); 857ff3ac5c3STrond Myklebust } else if (svc_xprt_reserve_slot(rqstp, xprt)) { 8586797fa5aSJ. Bruce Fields /* XPT_DATA|XPT_DEFERRED case: */ 8590f0257eaSTom Tucker rqstp->rq_deferred = svc_deferred_dequeue(xprt); 860ca7896cdSJ. Bruce Fields if (rqstp->rq_deferred) 8610f0257eaSTom Tucker len = svc_deferred_recv(rqstp); 862ca7896cdSJ. Bruce Fields else 8630f0257eaSTom Tucker len = xprt->xpt_ops->xpo_recvfrom(rqstp); 864d10f27a7SJ. Bruce Fields rqstp->rq_reserved = serv->sv_max_mesg; 865d10f27a7SJ. Bruce Fields atomic_add(rqstp->rq_reserved, &xprt->xpt_reserved); 866062b829cSTrond Myklebust } else 867062b829cSTrond Myklebust svc_xprt_received(xprt); 8685089f3d9SChuck Lever 86983a712e0SJeff Layton out: 8706797fa5aSJ. Bruce Fields return len; 8716797fa5aSJ. Bruce Fields } 8726797fa5aSJ. Bruce Fields 8736797fa5aSJ. Bruce Fields /* 8746797fa5aSJ. Bruce Fields * Receive the next request on any transport. This code is carefully 8756797fa5aSJ. Bruce Fields * organised not to touch any cachelines in the shared svc_serv 8766797fa5aSJ. Bruce Fields * structure, only cachelines in the local svc_pool. 8776797fa5aSJ. Bruce Fields */ 8786797fa5aSJ. Bruce Fields int svc_recv(struct svc_rqst *rqstp, long timeout) 8796797fa5aSJ. Bruce Fields { 8806797fa5aSJ. Bruce Fields struct svc_xprt *xprt = NULL; 8816797fa5aSJ. Bruce Fields struct svc_serv *serv = rqstp->rq_server; 8826797fa5aSJ. Bruce Fields int len, err; 8836797fa5aSJ. Bruce Fields 8846797fa5aSJ. Bruce Fields err = svc_alloc_arg(rqstp); 8856797fa5aSJ. Bruce Fields if (err) 886860a0d9eSJeff Layton goto out; 8876797fa5aSJ. Bruce Fields 8886797fa5aSJ. Bruce Fields try_to_freeze(); 8896797fa5aSJ. Bruce Fields cond_resched(); 890860a0d9eSJeff Layton err = -EINTR; 8916797fa5aSJ. Bruce Fields if (signalled() || kthread_should_stop()) 892860a0d9eSJeff Layton goto out; 8936797fa5aSJ. Bruce Fields 8946797fa5aSJ. Bruce Fields xprt = svc_get_next_xprt(rqstp, timeout); 895860a0d9eSJeff Layton if (IS_ERR(xprt)) { 896860a0d9eSJeff Layton err = PTR_ERR(xprt); 897860a0d9eSJeff Layton goto out; 898860a0d9eSJeff Layton } 8996797fa5aSJ. Bruce Fields 9006797fa5aSJ. Bruce Fields len = svc_handle_xprt(rqstp, xprt); 9010f0257eaSTom Tucker 9020f0257eaSTom Tucker /* No data, incomplete (TCP) read, or accept() */ 903860a0d9eSJeff Layton err = -EAGAIN; 9049f9d2ebeSJ. Bruce Fields if (len <= 0) 905860a0d9eSJeff Layton goto out_release; 906f8335a21SChuck Lever 9075f39d271SChuck Lever trace_svc_xdr_recvfrom(&rqstp->rq_arg); 908ca7896cdSJ. Bruce Fields 9090f0257eaSTom Tucker clear_bit(XPT_OLD, &xprt->xpt_flags); 9100f0257eaSTom Tucker 9110f0257eaSTom Tucker rqstp->rq_chandle.defer = svc_defer; 9120f0257eaSTom Tucker 9130f0257eaSTom Tucker if (serv->sv_stats) 9140f0257eaSTom Tucker serv->sv_stats->netcnt++; 915f8335a21SChuck Lever rqstp->rq_stime = ktime_get(); 9160f0257eaSTom Tucker return len; 917860a0d9eSJeff Layton out_release: 918ca7896cdSJ. Bruce Fields rqstp->rq_res.len = 0; 919ca7896cdSJ. Bruce Fields svc_xprt_release(rqstp); 920860a0d9eSJeff Layton out: 921860a0d9eSJeff Layton return err; 9220f0257eaSTom Tucker } 92324c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_recv); 9240f0257eaSTom Tucker 9250f0257eaSTom Tucker /* 9260f0257eaSTom Tucker * Drop request 9270f0257eaSTom Tucker */ 9280f0257eaSTom Tucker void svc_drop(struct svc_rqst *rqstp) 9290f0257eaSTom Tucker { 930104f6351STrond Myklebust trace_svc_drop(rqstp); 9310f0257eaSTom Tucker svc_xprt_release(rqstp); 9320f0257eaSTom Tucker } 93324c3767eSTrond Myklebust EXPORT_SYMBOL_GPL(svc_drop); 9340f0257eaSTom Tucker 93555fcc7d9SChuck Lever /** 93655fcc7d9SChuck Lever * svc_send - Return reply to client 93755fcc7d9SChuck Lever * @rqstp: RPC transaction context 93855fcc7d9SChuck Lever * 9390f0257eaSTom Tucker */ 94055fcc7d9SChuck Lever void svc_send(struct svc_rqst *rqstp) 9410f0257eaSTom Tucker { 9420f0257eaSTom Tucker struct svc_xprt *xprt; 9430f0257eaSTom Tucker struct xdr_buf *xb; 94455fcc7d9SChuck Lever int status; 9450f0257eaSTom Tucker 9460f0257eaSTom Tucker xprt = rqstp->rq_xprt; 9470f0257eaSTom Tucker if (!xprt) 94855fcc7d9SChuck Lever return; 9490f0257eaSTom Tucker 9500f0257eaSTom Tucker /* calculate over-all length */ 9510f0257eaSTom Tucker xb = &rqstp->rq_res; 9520f0257eaSTom Tucker xb->len = xb->head[0].iov_len + 9530f0257eaSTom Tucker xb->page_len + 9540f0257eaSTom Tucker xb->tail[0].iov_len; 9555f39d271SChuck Lever trace_svc_xdr_sendto(rqstp->rq_xid, xb); 956aaba72cdSChuck Lever trace_svc_stats_latency(rqstp); 957ca4faf54SChuck Lever 95855fcc7d9SChuck Lever status = xprt->xpt_ops->xpo_sendto(rqstp); 959ca4faf54SChuck Lever 96055fcc7d9SChuck Lever trace_svc_send(rqstp, status); 9610f0257eaSTom Tucker svc_xprt_release(rqstp); 9620f0257eaSTom Tucker } 9630f0257eaSTom Tucker 9640f0257eaSTom Tucker /* 9650f0257eaSTom Tucker * Timer function to close old temporary transports, using 9660f0257eaSTom Tucker * a mark-and-sweep algorithm. 9670f0257eaSTom Tucker */ 968ff861c4dSKees Cook static void svc_age_temp_xprts(struct timer_list *t) 9690f0257eaSTom Tucker { 970ff861c4dSKees Cook struct svc_serv *serv = from_timer(serv, t, sv_temptimer); 9710f0257eaSTom Tucker struct svc_xprt *xprt; 9720f0257eaSTom Tucker struct list_head *le, *next; 9730f0257eaSTom Tucker 9740f0257eaSTom Tucker dprintk("svc_age_temp_xprts\n"); 9750f0257eaSTom Tucker 9760f0257eaSTom Tucker if (!spin_trylock_bh(&serv->sv_lock)) { 9770f0257eaSTom Tucker /* busy, try again 1 sec later */ 9780f0257eaSTom Tucker dprintk("svc_age_temp_xprts: busy\n"); 9790f0257eaSTom Tucker mod_timer(&serv->sv_temptimer, jiffies + HZ); 9800f0257eaSTom Tucker return; 9810f0257eaSTom Tucker } 9820f0257eaSTom Tucker 9830f0257eaSTom Tucker list_for_each_safe(le, next, &serv->sv_tempsocks) { 9840f0257eaSTom Tucker xprt = list_entry(le, struct svc_xprt, xpt_list); 9850f0257eaSTom Tucker 9860f0257eaSTom Tucker /* First time through, just mark it OLD. Second time 9870f0257eaSTom Tucker * through, close it. */ 9880f0257eaSTom Tucker if (!test_and_set_bit(XPT_OLD, &xprt->xpt_flags)) 9890f0257eaSTom Tucker continue; 9902c935bc5SPeter Zijlstra if (kref_read(&xprt->xpt_ref) > 1 || 991f64f9e71SJoe Perches test_bit(XPT_BUSY, &xprt->xpt_flags)) 9920f0257eaSTom Tucker continue; 993e75bafbfSJ. Bruce Fields list_del_init(le); 9940f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 9950f0257eaSTom Tucker dprintk("queuing xprt %p for closing\n", xprt); 9960f0257eaSTom Tucker 9970f0257eaSTom Tucker /* a thread will dequeue and close it soon */ 9980f0257eaSTom Tucker svc_xprt_enqueue(xprt); 9990f0257eaSTom Tucker } 1000e75bafbfSJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 10010f0257eaSTom Tucker 10020f0257eaSTom Tucker mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ); 10030f0257eaSTom Tucker } 10040f0257eaSTom Tucker 1005c3d4879eSScott Mayhew /* Close temporary transports whose xpt_local matches server_addr immediately 1006c3d4879eSScott Mayhew * instead of waiting for them to be picked up by the timer. 1007c3d4879eSScott Mayhew * 1008c3d4879eSScott Mayhew * This is meant to be called from a notifier_block that runs when an ip 1009c3d4879eSScott Mayhew * address is deleted. 1010c3d4879eSScott Mayhew */ 1011c3d4879eSScott Mayhew void svc_age_temp_xprts_now(struct svc_serv *serv, struct sockaddr *server_addr) 1012c3d4879eSScott Mayhew { 1013c3d4879eSScott Mayhew struct svc_xprt *xprt; 1014c3d4879eSScott Mayhew struct list_head *le, *next; 1015c3d4879eSScott Mayhew LIST_HEAD(to_be_closed); 1016c3d4879eSScott Mayhew 1017c3d4879eSScott Mayhew spin_lock_bh(&serv->sv_lock); 1018c3d4879eSScott Mayhew list_for_each_safe(le, next, &serv->sv_tempsocks) { 1019c3d4879eSScott Mayhew xprt = list_entry(le, struct svc_xprt, xpt_list); 1020c3d4879eSScott Mayhew if (rpc_cmp_addr(server_addr, (struct sockaddr *) 1021c3d4879eSScott Mayhew &xprt->xpt_local)) { 1022c3d4879eSScott Mayhew dprintk("svc_age_temp_xprts_now: found %p\n", xprt); 1023c3d4879eSScott Mayhew list_move(le, &to_be_closed); 1024c3d4879eSScott Mayhew } 1025c3d4879eSScott Mayhew } 1026c3d4879eSScott Mayhew spin_unlock_bh(&serv->sv_lock); 1027c3d4879eSScott Mayhew 1028c3d4879eSScott Mayhew while (!list_empty(&to_be_closed)) { 1029c3d4879eSScott Mayhew le = to_be_closed.next; 1030c3d4879eSScott Mayhew list_del_init(le); 1031c3d4879eSScott Mayhew xprt = list_entry(le, struct svc_xprt, xpt_list); 1032546125d1SScott Mayhew set_bit(XPT_CLOSE, &xprt->xpt_flags); 1033546125d1SScott Mayhew set_bit(XPT_KILL_TEMP, &xprt->xpt_flags); 1034546125d1SScott Mayhew dprintk("svc_age_temp_xprts_now: queuing xprt %p for closing\n", 1035546125d1SScott Mayhew xprt); 1036546125d1SScott Mayhew svc_xprt_enqueue(xprt); 1037c3d4879eSScott Mayhew } 1038c3d4879eSScott Mayhew } 1039c3d4879eSScott Mayhew EXPORT_SYMBOL_GPL(svc_age_temp_xprts_now); 1040c3d4879eSScott Mayhew 1041edc7a894SJ. Bruce Fields static void call_xpt_users(struct svc_xprt *xprt) 1042edc7a894SJ. Bruce Fields { 1043edc7a894SJ. Bruce Fields struct svc_xpt_user *u; 1044edc7a894SJ. Bruce Fields 1045edc7a894SJ. Bruce Fields spin_lock(&xprt->xpt_lock); 1046edc7a894SJ. Bruce Fields while (!list_empty(&xprt->xpt_users)) { 1047edc7a894SJ. Bruce Fields u = list_first_entry(&xprt->xpt_users, struct svc_xpt_user, list); 1048bb6ad557STrond Myklebust list_del_init(&u->list); 1049edc7a894SJ. Bruce Fields u->callback(u); 1050edc7a894SJ. Bruce Fields } 1051edc7a894SJ. Bruce Fields spin_unlock(&xprt->xpt_lock); 1052edc7a894SJ. Bruce Fields } 1053edc7a894SJ. Bruce Fields 10540f0257eaSTom Tucker /* 10550f0257eaSTom Tucker * Remove a dead transport 10560f0257eaSTom Tucker */ 10577710ec36SJ. Bruce Fields static void svc_delete_xprt(struct svc_xprt *xprt) 10580f0257eaSTom Tucker { 10590f0257eaSTom Tucker struct svc_serv *serv = xprt->xpt_server; 106022945e4aSTom Tucker struct svc_deferred_req *dr; 106122945e4aSTom Tucker 106222945e4aSTom Tucker if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags)) 106311bbb0f7SChuck Lever return; 10640f0257eaSTom Tucker 106511bbb0f7SChuck Lever trace_svc_xprt_detach(xprt); 10660f0257eaSTom Tucker xprt->xpt_ops->xpo_detach(xprt); 10676221f1d9SChuck Lever if (xprt->xpt_bc_xprt) 10686221f1d9SChuck Lever xprt->xpt_bc_xprt->ops->close(xprt->xpt_bc_xprt); 10690f0257eaSTom Tucker 10700f0257eaSTom Tucker spin_lock_bh(&serv->sv_lock); 10710f0257eaSTom Tucker list_del_init(&xprt->xpt_list); 107201047298SWeston Andros Adamson WARN_ON_ONCE(!list_empty(&xprt->xpt_ready)); 10730f0257eaSTom Tucker if (test_bit(XPT_TEMP, &xprt->xpt_flags)) 10740f0257eaSTom Tucker serv->sv_tmpcnt--; 1075788e69e5SJ. Bruce Fields spin_unlock_bh(&serv->sv_lock); 107622945e4aSTom Tucker 1077ab1b18f7SNeil Brown while ((dr = svc_deferred_dequeue(xprt)) != NULL) 1078948f072aSNeilBrown free_deferred(xprt, dr); 107922945e4aSTom Tucker 1080edc7a894SJ. Bruce Fields call_xpt_users(xprt); 108122945e4aSTom Tucker svc_xprt_put(xprt); 10820f0257eaSTom Tucker } 10830f0257eaSTom Tucker 10844355d767SChuck Lever /** 10854355d767SChuck Lever * svc_xprt_close - Close a client connection 10864355d767SChuck Lever * @xprt: transport to disconnect 10874355d767SChuck Lever * 10884355d767SChuck Lever */ 10894355d767SChuck Lever void svc_xprt_close(struct svc_xprt *xprt) 10900f0257eaSTom Tucker { 109111bbb0f7SChuck Lever trace_svc_xprt_close(xprt); 10920f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 10930f0257eaSTom Tucker if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) 10940f0257eaSTom Tucker /* someone else will have to effect the close */ 10950f0257eaSTom Tucker return; 1096b1763316SJ. Bruce Fields /* 1097b1763316SJ. Bruce Fields * We expect svc_close_xprt() to work even when no threads are 1098b1763316SJ. Bruce Fields * running (e.g., while configuring the server before starting 1099b1763316SJ. Bruce Fields * any threads), so if the transport isn't busy, we delete 1100b1763316SJ. Bruce Fields * it ourself: 1101b1763316SJ. Bruce Fields */ 11020f0257eaSTom Tucker svc_delete_xprt(xprt); 11030f0257eaSTom Tucker } 11044355d767SChuck Lever EXPORT_SYMBOL_GPL(svc_xprt_close); 11050f0257eaSTom Tucker 1106cc630d9fSJ. Bruce Fields static int svc_close_list(struct svc_serv *serv, struct list_head *xprt_list, struct net *net) 11070f0257eaSTom Tucker { 11080f0257eaSTom Tucker struct svc_xprt *xprt; 1109cc630d9fSJ. Bruce Fields int ret = 0; 11100f0257eaSTom Tucker 1111c7de87ffSJoe Korty spin_lock_bh(&serv->sv_lock); 1112b4f36f88SJ. Bruce Fields list_for_each_entry(xprt, xprt_list, xpt_list) { 11137b147f1fSStanislav Kinsbursky if (xprt->xpt_net != net) 11147b147f1fSStanislav Kinsbursky continue; 1115cc630d9fSJ. Bruce Fields ret++; 11160f0257eaSTom Tucker set_bit(XPT_CLOSE, &xprt->xpt_flags); 1117cc630d9fSJ. Bruce Fields svc_xprt_enqueue(xprt); 11180f0257eaSTom Tucker } 1119c7de87ffSJoe Korty spin_unlock_bh(&serv->sv_lock); 1120cc630d9fSJ. Bruce Fields return ret; 11210f0257eaSTom Tucker } 11220f0257eaSTom Tucker 1123cc630d9fSJ. Bruce Fields static struct svc_xprt *svc_dequeue_net(struct svc_serv *serv, struct net *net) 11242fefb8a0SJ. Bruce Fields { 1125b4f36f88SJ. Bruce Fields struct svc_pool *pool; 1126b4f36f88SJ. Bruce Fields struct svc_xprt *xprt; 1127b4f36f88SJ. Bruce Fields struct svc_xprt *tmp; 1128b4f36f88SJ. Bruce Fields int i; 1129b4f36f88SJ. Bruce Fields 1130b4f36f88SJ. Bruce Fields for (i = 0; i < serv->sv_nrpools; i++) { 1131b4f36f88SJ. Bruce Fields pool = &serv->sv_pools[i]; 1132b4f36f88SJ. Bruce Fields 1133b4f36f88SJ. Bruce Fields spin_lock_bh(&pool->sp_lock); 11346f513365SStanislav Kinsbursky list_for_each_entry_safe(xprt, tmp, &pool->sp_sockets, xpt_ready) { 11357b147f1fSStanislav Kinsbursky if (xprt->xpt_net != net) 11367b147f1fSStanislav Kinsbursky continue; 1137b4f36f88SJ. Bruce Fields list_del_init(&xprt->xpt_ready); 1138cc630d9fSJ. Bruce Fields spin_unlock_bh(&pool->sp_lock); 1139cc630d9fSJ. Bruce Fields return xprt; 1140b4f36f88SJ. Bruce Fields } 1141b4f36f88SJ. Bruce Fields spin_unlock_bh(&pool->sp_lock); 1142b4f36f88SJ. Bruce Fields } 1143cc630d9fSJ. Bruce Fields return NULL; 11446f513365SStanislav Kinsbursky } 11456f513365SStanislav Kinsbursky 1146cc630d9fSJ. Bruce Fields static void svc_clean_up_xprts(struct svc_serv *serv, struct net *net) 11476f513365SStanislav Kinsbursky { 11486f513365SStanislav Kinsbursky struct svc_xprt *xprt; 11496f513365SStanislav Kinsbursky 1150cc630d9fSJ. Bruce Fields while ((xprt = svc_dequeue_net(serv, net))) { 1151cc630d9fSJ. Bruce Fields set_bit(XPT_CLOSE, &xprt->xpt_flags); 1152719f8bccSJ. Bruce Fields svc_delete_xprt(xprt); 11533a22bf50SStanislav Kinsbursky } 1154cc630d9fSJ. Bruce Fields } 11553a22bf50SStanislav Kinsbursky 1156c7d7ec8fSChuck Lever /** 1157c7d7ec8fSChuck Lever * svc_xprt_destroy_all - Destroy transports associated with @serv 1158c7d7ec8fSChuck Lever * @serv: RPC service to be shut down 1159c7d7ec8fSChuck Lever * @net: target network namespace 1160c7d7ec8fSChuck Lever * 1161cc630d9fSJ. Bruce Fields * Server threads may still be running (especially in the case where the 1162cc630d9fSJ. Bruce Fields * service is still running in other network namespaces). 1163cc630d9fSJ. Bruce Fields * 1164cc630d9fSJ. Bruce Fields * So we shut down sockets the same way we would on a running server, by 1165cc630d9fSJ. Bruce Fields * setting XPT_CLOSE, enqueuing, and letting a thread pick it up to do 1166cc630d9fSJ. Bruce Fields * the close. In the case there are no such other threads, 1167cc630d9fSJ. Bruce Fields * threads running, svc_clean_up_xprts() does a simple version of a 1168cc630d9fSJ. Bruce Fields * server's main event loop, and in the case where there are other 1169cc630d9fSJ. Bruce Fields * threads, we may need to wait a little while and then check again to 1170cc630d9fSJ. Bruce Fields * see if they're done. 1171cc630d9fSJ. Bruce Fields */ 1172c7d7ec8fSChuck Lever void svc_xprt_destroy_all(struct svc_serv *serv, struct net *net) 11733a22bf50SStanislav Kinsbursky { 1174cc630d9fSJ. Bruce Fields int delay = 0; 11756f513365SStanislav Kinsbursky 1176cc630d9fSJ. Bruce Fields while (svc_close_list(serv, &serv->sv_permsocks, net) + 1177cc630d9fSJ. Bruce Fields svc_close_list(serv, &serv->sv_tempsocks, net)) { 1178cc630d9fSJ. Bruce Fields 1179cc630d9fSJ. Bruce Fields svc_clean_up_xprts(serv, net); 1180cc630d9fSJ. Bruce Fields msleep(delay++); 1181cc630d9fSJ. Bruce Fields } 11822fefb8a0SJ. Bruce Fields } 1183c7d7ec8fSChuck Lever EXPORT_SYMBOL_GPL(svc_xprt_destroy_all); 11842fefb8a0SJ. Bruce Fields 11850f0257eaSTom Tucker /* 11860f0257eaSTom Tucker * Handle defer and revisit of requests 11870f0257eaSTom Tucker */ 11880f0257eaSTom Tucker 11890f0257eaSTom Tucker static void svc_revisit(struct cache_deferred_req *dreq, int too_many) 11900f0257eaSTom Tucker { 11910f0257eaSTom Tucker struct svc_deferred_req *dr = 11920f0257eaSTom Tucker container_of(dreq, struct svc_deferred_req, handle); 11930f0257eaSTom Tucker struct svc_xprt *xprt = dr->xprt; 11940f0257eaSTom Tucker 119522945e4aSTom Tucker spin_lock(&xprt->xpt_lock); 119622945e4aSTom Tucker set_bit(XPT_DEFERRED, &xprt->xpt_flags); 119722945e4aSTom Tucker if (too_many || test_bit(XPT_DEAD, &xprt->xpt_flags)) { 119822945e4aSTom Tucker spin_unlock(&xprt->xpt_lock); 11998954c5c2SChuck Lever trace_svc_defer_drop(dr); 1200948f072aSNeilBrown free_deferred(xprt, dr); 12010f0257eaSTom Tucker svc_xprt_put(xprt); 12020f0257eaSTom Tucker return; 12030f0257eaSTom Tucker } 12040f0257eaSTom Tucker dr->xprt = NULL; 12050f0257eaSTom Tucker list_add(&dr->handle.recent, &xprt->xpt_deferred); 12060f0257eaSTom Tucker spin_unlock(&xprt->xpt_lock); 12078954c5c2SChuck Lever trace_svc_defer_queue(dr); 12080f0257eaSTom Tucker svc_xprt_enqueue(xprt); 12090f0257eaSTom Tucker svc_xprt_put(xprt); 12100f0257eaSTom Tucker } 12110f0257eaSTom Tucker 1212260c1d12STom Tucker /* 1213260c1d12STom Tucker * Save the request off for later processing. The request buffer looks 1214260c1d12STom Tucker * like this: 1215260c1d12STom Tucker * 1216260c1d12STom Tucker * <xprt-header><rpc-header><rpc-pagelist><rpc-tail> 1217260c1d12STom Tucker * 1218260c1d12STom Tucker * This code can only handle requests that consist of an xprt-header 1219260c1d12STom Tucker * and rpc-header. 1220260c1d12STom Tucker */ 12210f0257eaSTom Tucker static struct cache_deferred_req *svc_defer(struct cache_req *req) 12220f0257eaSTom Tucker { 12230f0257eaSTom Tucker struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle); 12240f0257eaSTom Tucker struct svc_deferred_req *dr; 12250f0257eaSTom Tucker 122630660e04SJeff Layton if (rqstp->rq_arg.page_len || !test_bit(RQ_USEDEFERRAL, &rqstp->rq_flags)) 12270f0257eaSTom Tucker return NULL; /* if more than a page, give up FIXME */ 12280f0257eaSTom Tucker if (rqstp->rq_deferred) { 12290f0257eaSTom Tucker dr = rqstp->rq_deferred; 12300f0257eaSTom Tucker rqstp->rq_deferred = NULL; 12310f0257eaSTom Tucker } else { 1232260c1d12STom Tucker size_t skip; 1233260c1d12STom Tucker size_t size; 12340f0257eaSTom Tucker /* FIXME maybe discard if size too large */ 1235260c1d12STom Tucker size = sizeof(struct svc_deferred_req) + rqstp->rq_arg.len; 12360f0257eaSTom Tucker dr = kmalloc(size, GFP_KERNEL); 12370f0257eaSTom Tucker if (dr == NULL) 12380f0257eaSTom Tucker return NULL; 12390f0257eaSTom Tucker 12400f0257eaSTom Tucker dr->handle.owner = rqstp->rq_server; 12410f0257eaSTom Tucker dr->prot = rqstp->rq_prot; 12420f0257eaSTom Tucker memcpy(&dr->addr, &rqstp->rq_addr, rqstp->rq_addrlen); 12430f0257eaSTom Tucker dr->addrlen = rqstp->rq_addrlen; 12440f0257eaSTom Tucker dr->daddr = rqstp->rq_daddr; 12450f0257eaSTom Tucker dr->argslen = rqstp->rq_arg.len >> 2; 1246260c1d12STom Tucker 1247260c1d12STom Tucker /* back up head to the start of the buffer and copy */ 1248260c1d12STom Tucker skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; 12490f0257eaSTom Tucker memcpy(dr->args, rqstp->rq_arg.head[0].iov_base - skip, 12500f0257eaSTom Tucker dr->argslen << 2); 12510f0257eaSTom Tucker } 1252948f072aSNeilBrown dr->xprt_ctxt = rqstp->rq_xprt_ctxt; 1253eb8d3a2cSNeilBrown rqstp->rq_xprt_ctxt = NULL; 12548954c5c2SChuck Lever trace_svc_defer(rqstp); 12550f0257eaSTom Tucker svc_xprt_get(rqstp->rq_xprt); 12560f0257eaSTom Tucker dr->xprt = rqstp->rq_xprt; 12577827c81fSChuck Lever set_bit(RQ_DROPME, &rqstp->rq_flags); 12580f0257eaSTom Tucker 12590f0257eaSTom Tucker dr->handle.revisit = svc_revisit; 12600f0257eaSTom Tucker return &dr->handle; 12610f0257eaSTom Tucker } 12620f0257eaSTom Tucker 12630f0257eaSTom Tucker /* 12640f0257eaSTom Tucker * recv data from a deferred request into an active one 12650f0257eaSTom Tucker */ 12668954c5c2SChuck Lever static noinline int svc_deferred_recv(struct svc_rqst *rqstp) 12670f0257eaSTom Tucker { 12680f0257eaSTom Tucker struct svc_deferred_req *dr = rqstp->rq_deferred; 12690f0257eaSTom Tucker 12708954c5c2SChuck Lever trace_svc_defer_recv(dr); 12718954c5c2SChuck Lever 1272260c1d12STom Tucker /* setup iov_base past transport header */ 1273983084b2SChuck Lever rqstp->rq_arg.head[0].iov_base = dr->args; 1274260c1d12STom Tucker /* The iov_len does not include the transport header bytes */ 1275983084b2SChuck Lever rqstp->rq_arg.head[0].iov_len = dr->argslen << 2; 12760f0257eaSTom Tucker rqstp->rq_arg.page_len = 0; 1277260c1d12STom Tucker /* The rq_arg.len includes the transport header bytes */ 12780f0257eaSTom Tucker rqstp->rq_arg.len = dr->argslen << 2; 12790f0257eaSTom Tucker rqstp->rq_prot = dr->prot; 12800f0257eaSTom Tucker memcpy(&rqstp->rq_addr, &dr->addr, dr->addrlen); 12810f0257eaSTom Tucker rqstp->rq_addrlen = dr->addrlen; 1282260c1d12STom Tucker /* Save off transport header len in case we get deferred again */ 12830f0257eaSTom Tucker rqstp->rq_daddr = dr->daddr; 12840f0257eaSTom Tucker rqstp->rq_respages = rqstp->rq_pages; 1285773f91b2SChuck Lever rqstp->rq_xprt_ctxt = dr->xprt_ctxt; 1286948f072aSNeilBrown 1287948f072aSNeilBrown dr->xprt_ctxt = NULL; 128882011c80SChuck Lever svc_xprt_received(rqstp->rq_xprt); 1289983084b2SChuck Lever return dr->argslen << 2; 12900f0257eaSTom Tucker } 12910f0257eaSTom Tucker 12920f0257eaSTom Tucker 12930f0257eaSTom Tucker static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt) 12940f0257eaSTom Tucker { 12950f0257eaSTom Tucker struct svc_deferred_req *dr = NULL; 12960f0257eaSTom Tucker 12970f0257eaSTom Tucker if (!test_bit(XPT_DEFERRED, &xprt->xpt_flags)) 12980f0257eaSTom Tucker return NULL; 12990f0257eaSTom Tucker spin_lock(&xprt->xpt_lock); 13000f0257eaSTom Tucker if (!list_empty(&xprt->xpt_deferred)) { 13010f0257eaSTom Tucker dr = list_entry(xprt->xpt_deferred.next, 13020f0257eaSTom Tucker struct svc_deferred_req, 13030f0257eaSTom Tucker handle.recent); 13040f0257eaSTom Tucker list_del_init(&dr->handle.recent); 130562bac4afSJ. Bruce Fields } else 130662bac4afSJ. Bruce Fields clear_bit(XPT_DEFERRED, &xprt->xpt_flags); 13070f0257eaSTom Tucker spin_unlock(&xprt->xpt_lock); 13080f0257eaSTom Tucker return dr; 13090f0257eaSTom Tucker } 13107fcb98d5STom Tucker 1311156e6209SChuck Lever /** 1312156e6209SChuck Lever * svc_find_xprt - find an RPC transport instance 1313156e6209SChuck Lever * @serv: pointer to svc_serv to search 1314156e6209SChuck Lever * @xcl_name: C string containing transport's class name 13154cb54ca2SStanislav Kinsbursky * @net: owner net pointer 1316156e6209SChuck Lever * @af: Address family of transport's local address 1317156e6209SChuck Lever * @port: transport's IP port number 1318156e6209SChuck Lever * 13197fcb98d5STom Tucker * Return the transport instance pointer for the endpoint accepting 13207fcb98d5STom Tucker * connections/peer traffic from the specified transport class, 13217fcb98d5STom Tucker * address family and port. 13227fcb98d5STom Tucker * 13237fcb98d5STom Tucker * Specifying 0 for the address family or port is effectively a 13247fcb98d5STom Tucker * wild-card, and will result in matching the first transport in the 13257fcb98d5STom Tucker * service's list that has a matching class name. 13267fcb98d5STom Tucker */ 1327156e6209SChuck Lever struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name, 13284cb54ca2SStanislav Kinsbursky struct net *net, const sa_family_t af, 13294cb54ca2SStanislav Kinsbursky const unsigned short port) 13307fcb98d5STom Tucker { 13317fcb98d5STom Tucker struct svc_xprt *xprt; 13327fcb98d5STom Tucker struct svc_xprt *found = NULL; 13337fcb98d5STom Tucker 13347fcb98d5STom Tucker /* Sanity check the args */ 1335156e6209SChuck Lever if (serv == NULL || xcl_name == NULL) 13367fcb98d5STom Tucker return found; 13377fcb98d5STom Tucker 13387fcb98d5STom Tucker spin_lock_bh(&serv->sv_lock); 13397fcb98d5STom Tucker list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { 13404cb54ca2SStanislav Kinsbursky if (xprt->xpt_net != net) 13414cb54ca2SStanislav Kinsbursky continue; 13427fcb98d5STom Tucker if (strcmp(xprt->xpt_class->xcl_name, xcl_name)) 13437fcb98d5STom Tucker continue; 13447fcb98d5STom Tucker if (af != AF_UNSPEC && af != xprt->xpt_local.ss_family) 13457fcb98d5STom Tucker continue; 1346156e6209SChuck Lever if (port != 0 && port != svc_xprt_local_port(xprt)) 13477fcb98d5STom Tucker continue; 13487fcb98d5STom Tucker found = xprt; 1349a217813fSTom Tucker svc_xprt_get(xprt); 13507fcb98d5STom Tucker break; 13517fcb98d5STom Tucker } 13527fcb98d5STom Tucker spin_unlock_bh(&serv->sv_lock); 13537fcb98d5STom Tucker return found; 13547fcb98d5STom Tucker } 13557fcb98d5STom Tucker EXPORT_SYMBOL_GPL(svc_find_xprt); 13569571af18STom Tucker 1357335c54bdSChuck Lever static int svc_one_xprt_name(const struct svc_xprt *xprt, 1358335c54bdSChuck Lever char *pos, int remaining) 1359335c54bdSChuck Lever { 1360335c54bdSChuck Lever int len; 1361335c54bdSChuck Lever 1362335c54bdSChuck Lever len = snprintf(pos, remaining, "%s %u\n", 1363335c54bdSChuck Lever xprt->xpt_class->xcl_name, 1364335c54bdSChuck Lever svc_xprt_local_port(xprt)); 1365335c54bdSChuck Lever if (len >= remaining) 1366335c54bdSChuck Lever return -ENAMETOOLONG; 1367335c54bdSChuck Lever return len; 1368335c54bdSChuck Lever } 1369335c54bdSChuck Lever 1370335c54bdSChuck Lever /** 1371335c54bdSChuck Lever * svc_xprt_names - format a buffer with a list of transport names 1372335c54bdSChuck Lever * @serv: pointer to an RPC service 1373335c54bdSChuck Lever * @buf: pointer to a buffer to be filled in 1374335c54bdSChuck Lever * @buflen: length of buffer to be filled in 1375335c54bdSChuck Lever * 1376335c54bdSChuck Lever * Fills in @buf with a string containing a list of transport names, 1377335c54bdSChuck Lever * each name terminated with '\n'. 1378335c54bdSChuck Lever * 1379335c54bdSChuck Lever * Returns positive length of the filled-in string on success; otherwise 1380335c54bdSChuck Lever * a negative errno value is returned if an error occurs. 13819571af18STom Tucker */ 1382335c54bdSChuck Lever int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen) 13839571af18STom Tucker { 13849571af18STom Tucker struct svc_xprt *xprt; 1385335c54bdSChuck Lever int len, totlen; 1386335c54bdSChuck Lever char *pos; 13879571af18STom Tucker 13889571af18STom Tucker /* Sanity check args */ 13899571af18STom Tucker if (!serv) 13909571af18STom Tucker return 0; 13919571af18STom Tucker 13929571af18STom Tucker spin_lock_bh(&serv->sv_lock); 1393335c54bdSChuck Lever 1394335c54bdSChuck Lever pos = buf; 1395335c54bdSChuck Lever totlen = 0; 13969571af18STom Tucker list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { 1397335c54bdSChuck Lever len = svc_one_xprt_name(xprt, pos, buflen - totlen); 1398335c54bdSChuck Lever if (len < 0) { 1399335c54bdSChuck Lever *buf = '\0'; 1400335c54bdSChuck Lever totlen = len; 1401335c54bdSChuck Lever } 1402335c54bdSChuck Lever if (len <= 0) 14039571af18STom Tucker break; 1404335c54bdSChuck Lever 1405335c54bdSChuck Lever pos += len; 14069571af18STom Tucker totlen += len; 14079571af18STom Tucker } 1408335c54bdSChuck Lever 14099571af18STom Tucker spin_unlock_bh(&serv->sv_lock); 14109571af18STom Tucker return totlen; 14119571af18STom Tucker } 14129571af18STom Tucker EXPORT_SYMBOL_GPL(svc_xprt_names); 141303cf6c9fSGreg Banks 141403cf6c9fSGreg Banks 141503cf6c9fSGreg Banks /*----------------------------------------------------------------------------*/ 141603cf6c9fSGreg Banks 141703cf6c9fSGreg Banks static void *svc_pool_stats_start(struct seq_file *m, loff_t *pos) 141803cf6c9fSGreg Banks { 141903cf6c9fSGreg Banks unsigned int pidx = (unsigned int)*pos; 142003cf6c9fSGreg Banks struct svc_serv *serv = m->private; 142103cf6c9fSGreg Banks 142203cf6c9fSGreg Banks dprintk("svc_pool_stats_start, *pidx=%u\n", pidx); 142303cf6c9fSGreg Banks 142403cf6c9fSGreg Banks if (!pidx) 142503cf6c9fSGreg Banks return SEQ_START_TOKEN; 142603cf6c9fSGreg Banks return (pidx > serv->sv_nrpools ? NULL : &serv->sv_pools[pidx-1]); 142703cf6c9fSGreg Banks } 142803cf6c9fSGreg Banks 142903cf6c9fSGreg Banks static void *svc_pool_stats_next(struct seq_file *m, void *p, loff_t *pos) 143003cf6c9fSGreg Banks { 143103cf6c9fSGreg Banks struct svc_pool *pool = p; 143203cf6c9fSGreg Banks struct svc_serv *serv = m->private; 143303cf6c9fSGreg Banks 143403cf6c9fSGreg Banks dprintk("svc_pool_stats_next, *pos=%llu\n", *pos); 143503cf6c9fSGreg Banks 143603cf6c9fSGreg Banks if (p == SEQ_START_TOKEN) { 143703cf6c9fSGreg Banks pool = &serv->sv_pools[0]; 143803cf6c9fSGreg Banks } else { 143903cf6c9fSGreg Banks unsigned int pidx = (pool - &serv->sv_pools[0]); 144003cf6c9fSGreg Banks if (pidx < serv->sv_nrpools-1) 144103cf6c9fSGreg Banks pool = &serv->sv_pools[pidx+1]; 144203cf6c9fSGreg Banks else 144303cf6c9fSGreg Banks pool = NULL; 144403cf6c9fSGreg Banks } 144503cf6c9fSGreg Banks ++*pos; 144603cf6c9fSGreg Banks return pool; 144703cf6c9fSGreg Banks } 144803cf6c9fSGreg Banks 144903cf6c9fSGreg Banks static void svc_pool_stats_stop(struct seq_file *m, void *p) 145003cf6c9fSGreg Banks { 145103cf6c9fSGreg Banks } 145203cf6c9fSGreg Banks 145303cf6c9fSGreg Banks static int svc_pool_stats_show(struct seq_file *m, void *p) 145403cf6c9fSGreg Banks { 145503cf6c9fSGreg Banks struct svc_pool *pool = p; 145603cf6c9fSGreg Banks 145703cf6c9fSGreg Banks if (p == SEQ_START_TOKEN) { 145878c210efSJ. Bruce Fields seq_puts(m, "# pool packets-arrived sockets-enqueued threads-woken threads-timedout\n"); 145903cf6c9fSGreg Banks return 0; 146003cf6c9fSGreg Banks } 146103cf6c9fSGreg Banks 1462ccf08bedSChuck Lever seq_printf(m, "%u %llu %llu %llu %llu\n", 146303cf6c9fSGreg Banks pool->sp_id, 1464ccf08bedSChuck Lever percpu_counter_sum_positive(&pool->sp_sockets_queued), 1465ccf08bedSChuck Lever percpu_counter_sum_positive(&pool->sp_sockets_queued), 1466ccf08bedSChuck Lever percpu_counter_sum_positive(&pool->sp_threads_woken), 1467ccf08bedSChuck Lever percpu_counter_sum_positive(&pool->sp_threads_timedout)); 146803cf6c9fSGreg Banks 146903cf6c9fSGreg Banks return 0; 147003cf6c9fSGreg Banks } 147103cf6c9fSGreg Banks 147203cf6c9fSGreg Banks static const struct seq_operations svc_pool_stats_seq_ops = { 147303cf6c9fSGreg Banks .start = svc_pool_stats_start, 147403cf6c9fSGreg Banks .next = svc_pool_stats_next, 147503cf6c9fSGreg Banks .stop = svc_pool_stats_stop, 147603cf6c9fSGreg Banks .show = svc_pool_stats_show, 147703cf6c9fSGreg Banks }; 147803cf6c9fSGreg Banks 147903cf6c9fSGreg Banks int svc_pool_stats_open(struct svc_serv *serv, struct file *file) 148003cf6c9fSGreg Banks { 148103cf6c9fSGreg Banks int err; 148203cf6c9fSGreg Banks 148303cf6c9fSGreg Banks err = seq_open(file, &svc_pool_stats_seq_ops); 148403cf6c9fSGreg Banks if (!err) 148503cf6c9fSGreg Banks ((struct seq_file *) file->private_data)->private = serv; 148603cf6c9fSGreg Banks return err; 148703cf6c9fSGreg Banks } 148803cf6c9fSGreg Banks EXPORT_SYMBOL(svc_pool_stats_open); 148903cf6c9fSGreg Banks 149003cf6c9fSGreg Banks /*----------------------------------------------------------------------------*/ 1491