Tom Tucker | 1d8206b9 | 2007-12-30 21:07:15 -0600 | [diff] [blame] | 1 | /* |
| 2 | * linux/net/sunrpc/svc_xprt.c |
| 3 | * |
| 4 | * Author: Tom Tucker <tom@opengridcomputing.com> |
| 5 | */ |
| 6 | |
| 7 | #include <linux/sched.h> |
| 8 | #include <linux/errno.h> |
Tom Tucker | 1d8206b9 | 2007-12-30 21:07:15 -0600 | [diff] [blame] | 9 | #include <linux/freezer.h> |
Jeff Layton | 7086721 | 2008-02-07 16:34:54 -0500 | [diff] [blame] | 10 | #include <linux/kthread.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 11 | #include <linux/slab.h> |
Tom Tucker | 1d8206b9 | 2007-12-30 21:07:15 -0600 | [diff] [blame] | 12 | #include <net/sock.h> |
Tom Tucker | 1d8206b9 | 2007-12-30 21:07:15 -0600 | [diff] [blame] | 13 | #include <linux/sunrpc/stats.h> |
| 14 | #include <linux/sunrpc/svc_xprt.h> |
H Hartley Sweeten | dcf1a35 | 2009-04-22 20:18:19 -0400 | [diff] [blame] | 15 | #include <linux/sunrpc/svcsock.h> |
J. Bruce Fields | 99de8ea | 2010-12-08 12:45:44 -0500 | [diff] [blame] | 16 | #include <linux/sunrpc/xprt.h> |
Paul Gortmaker | 3a9a231 | 2011-05-27 09:12:25 -0400 | [diff] [blame] | 17 | #include <linux/module.h> |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 18 | #include <trace/events/sunrpc.h> |
Tom Tucker | 1d8206b9 | 2007-12-30 21:07:15 -0600 | [diff] [blame] | 19 | |
| 20 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
| 21 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 22 | static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt); |
| 23 | static int svc_deferred_recv(struct svc_rqst *rqstp); |
| 24 | static struct cache_deferred_req *svc_defer(struct cache_req *req); |
| 25 | static void svc_age_temp_xprts(unsigned long closure); |
J. Bruce Fields | 7710ec3 | 2011-11-25 18:44:05 -0500 | [diff] [blame] | 26 | static void svc_delete_xprt(struct svc_xprt *xprt); |
Trond Myklebust | 0971374 | 2014-07-24 23:59:31 -0400 | [diff] [blame] | 27 | static void svc_xprt_do_enqueue(struct svc_xprt *xprt); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 28 | |
| 29 | /* apparently the "standard" is that clients close |
| 30 | * idle connections after 5 minutes, servers after |
| 31 | * 6 minutes |
| 32 | * http://www.connectathon.org/talks96/nfstcp.pdf |
| 33 | */ |
| 34 | static int svc_conn_age_period = 6*60; |
| 35 | |
Tom Tucker | 1d8206b9 | 2007-12-30 21:07:15 -0600 | [diff] [blame] | 36 | /* List of registered transport classes */ |
| 37 | static DEFINE_SPINLOCK(svc_xprt_class_lock); |
| 38 | static LIST_HEAD(svc_xprt_class_list); |
| 39 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 40 | /* SMP locking strategy: |
| 41 | * |
| 42 | * svc_pool->sp_lock protects most of the fields of that pool. |
| 43 | * svc_serv->sv_lock protects sv_tempsocks, sv_permsocks, sv_tmpcnt. |
| 44 | * when both need to be taken (rare), svc_serv->sv_lock is first. |
| 45 | * BKL protects svc_serv->sv_nrthread. |
| 46 | * svc_sock->sk_lock protects the svc_sock->sk_deferred list |
| 47 | * and the ->sk_info_authunix cache. |
| 48 | * |
| 49 | * The XPT_BUSY bit in xprt->xpt_flags prevents a transport being |
| 50 | * enqueued multiply. During normal transport processing this bit |
| 51 | * is set by svc_xprt_enqueue and cleared by svc_xprt_received. |
| 52 | * Providers should not manipulate this bit directly. |
| 53 | * |
| 54 | * Some flags can be set to certain values at any time |
| 55 | * providing that certain rules are followed: |
| 56 | * |
| 57 | * XPT_CONN, XPT_DATA: |
| 58 | * - Can be set or cleared at any time. |
| 59 | * - After a set, svc_xprt_enqueue must be called to enqueue |
| 60 | * the transport for processing. |
| 61 | * - After a clear, the transport must be read/accepted. |
| 62 | * If this succeeds, it must be set again. |
| 63 | * XPT_CLOSE: |
| 64 | * - Can set at any time. It is never cleared. |
| 65 | * XPT_DEAD: |
| 66 | * - Can only be set while XPT_BUSY is held which ensures |
| 67 | * that no other thread will be using the transport or will |
| 68 | * try to set XPT_DEAD. |
| 69 | */ |
| 70 | |
Tom Tucker | 1d8206b9 | 2007-12-30 21:07:15 -0600 | [diff] [blame] | 71 | int svc_reg_xprt_class(struct svc_xprt_class *xcl) |
| 72 | { |
| 73 | struct svc_xprt_class *cl; |
| 74 | int res = -EEXIST; |
| 75 | |
| 76 | dprintk("svc: Adding svc transport class '%s'\n", xcl->xcl_name); |
| 77 | |
| 78 | INIT_LIST_HEAD(&xcl->xcl_list); |
| 79 | spin_lock(&svc_xprt_class_lock); |
| 80 | /* Make sure there isn't already a class with the same name */ |
| 81 | list_for_each_entry(cl, &svc_xprt_class_list, xcl_list) { |
| 82 | if (strcmp(xcl->xcl_name, cl->xcl_name) == 0) |
| 83 | goto out; |
| 84 | } |
| 85 | list_add_tail(&xcl->xcl_list, &svc_xprt_class_list); |
| 86 | res = 0; |
| 87 | out: |
| 88 | spin_unlock(&svc_xprt_class_lock); |
| 89 | return res; |
| 90 | } |
| 91 | EXPORT_SYMBOL_GPL(svc_reg_xprt_class); |
| 92 | |
| 93 | void svc_unreg_xprt_class(struct svc_xprt_class *xcl) |
| 94 | { |
| 95 | dprintk("svc: Removing svc transport class '%s'\n", xcl->xcl_name); |
| 96 | spin_lock(&svc_xprt_class_lock); |
| 97 | list_del_init(&xcl->xcl_list); |
| 98 | spin_unlock(&svc_xprt_class_lock); |
| 99 | } |
| 100 | EXPORT_SYMBOL_GPL(svc_unreg_xprt_class); |
| 101 | |
Tom Tucker | dc9a16e | 2007-12-30 21:08:31 -0600 | [diff] [blame] | 102 | /* |
| 103 | * Format the transport list for printing |
| 104 | */ |
| 105 | int svc_print_xprts(char *buf, int maxlen) |
| 106 | { |
Pavel Emelyanov | 8f3a6de | 2010-10-05 23:30:19 +0400 | [diff] [blame] | 107 | struct svc_xprt_class *xcl; |
Tom Tucker | dc9a16e | 2007-12-30 21:08:31 -0600 | [diff] [blame] | 108 | char tmpstr[80]; |
| 109 | int len = 0; |
| 110 | buf[0] = '\0'; |
| 111 | |
| 112 | spin_lock(&svc_xprt_class_lock); |
Pavel Emelyanov | 8f3a6de | 2010-10-05 23:30:19 +0400 | [diff] [blame] | 113 | list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) { |
Tom Tucker | dc9a16e | 2007-12-30 21:08:31 -0600 | [diff] [blame] | 114 | int slen; |
Tom Tucker | dc9a16e | 2007-12-30 21:08:31 -0600 | [diff] [blame] | 115 | |
| 116 | sprintf(tmpstr, "%s %d\n", xcl->xcl_name, xcl->xcl_max_payload); |
| 117 | slen = strlen(tmpstr); |
| 118 | if (len + slen > maxlen) |
| 119 | break; |
| 120 | len += slen; |
| 121 | strcat(buf, tmpstr); |
| 122 | } |
| 123 | spin_unlock(&svc_xprt_class_lock); |
| 124 | |
| 125 | return len; |
| 126 | } |
| 127 | |
Tom Tucker | e1b3157 | 2007-12-30 21:07:46 -0600 | [diff] [blame] | 128 | static void svc_xprt_free(struct kref *kref) |
| 129 | { |
| 130 | struct svc_xprt *xprt = |
| 131 | container_of(kref, struct svc_xprt, xpt_ref); |
| 132 | struct module *owner = xprt->xpt_class->xcl_owner; |
Pavel Emelyanov | e3bfca0 | 2010-09-27 13:58:42 +0400 | [diff] [blame] | 133 | if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) |
| 134 | svcauth_unix_info_release(xprt); |
Pavel Emelyanov | 4fb8518 | 2010-09-27 14:00:49 +0400 | [diff] [blame] | 135 | put_net(xprt->xpt_net); |
J. Bruce Fields | 99de8ea | 2010-12-08 12:45:44 -0500 | [diff] [blame] | 136 | /* See comment on corresponding get in xs_setup_bc_tcp(): */ |
| 137 | if (xprt->xpt_bc_xprt) |
| 138 | xprt_put(xprt->xpt_bc_xprt); |
Tom Tucker | e1b3157 | 2007-12-30 21:07:46 -0600 | [diff] [blame] | 139 | xprt->xpt_ops->xpo_free(xprt); |
| 140 | module_put(owner); |
| 141 | } |
| 142 | |
| 143 | void svc_xprt_put(struct svc_xprt *xprt) |
| 144 | { |
| 145 | kref_put(&xprt->xpt_ref, svc_xprt_free); |
| 146 | } |
| 147 | EXPORT_SYMBOL_GPL(svc_xprt_put); |
| 148 | |
Tom Tucker | 1d8206b9 | 2007-12-30 21:07:15 -0600 | [diff] [blame] | 149 | /* |
| 150 | * Called by transport drivers to initialize the transport independent |
| 151 | * portion of the transport instance. |
| 152 | */ |
Stanislav Kinsbursky | bd4620d | 2011-12-06 14:19:10 +0300 | [diff] [blame] | 153 | void svc_xprt_init(struct net *net, struct svc_xprt_class *xcl, |
| 154 | struct svc_xprt *xprt, struct svc_serv *serv) |
Tom Tucker | 1d8206b9 | 2007-12-30 21:07:15 -0600 | [diff] [blame] | 155 | { |
| 156 | memset(xprt, 0, sizeof(*xprt)); |
| 157 | xprt->xpt_class = xcl; |
| 158 | xprt->xpt_ops = xcl->xcl_ops; |
Tom Tucker | e1b3157 | 2007-12-30 21:07:46 -0600 | [diff] [blame] | 159 | kref_init(&xprt->xpt_ref); |
Tom Tucker | bb5cf16 | 2007-12-30 21:07:50 -0600 | [diff] [blame] | 160 | xprt->xpt_server = serv; |
Tom Tucker | 7a18208 | 2007-12-30 21:07:53 -0600 | [diff] [blame] | 161 | INIT_LIST_HEAD(&xprt->xpt_list); |
| 162 | INIT_LIST_HEAD(&xprt->xpt_ready); |
Tom Tucker | 8c7b017 | 2007-12-30 21:08:10 -0600 | [diff] [blame] | 163 | INIT_LIST_HEAD(&xprt->xpt_deferred); |
J. Bruce Fields | edc7a89 | 2010-03-22 15:37:17 -0400 | [diff] [blame] | 164 | INIT_LIST_HEAD(&xprt->xpt_users); |
Tom Tucker | a50fea2 | 2007-12-30 21:07:59 -0600 | [diff] [blame] | 165 | mutex_init(&xprt->xpt_mutex); |
Tom Tucker | def13d7 | 2007-12-30 21:08:08 -0600 | [diff] [blame] | 166 | spin_lock_init(&xprt->xpt_lock); |
Tom Tucker | 4e5caaa | 2007-12-30 21:08:20 -0600 | [diff] [blame] | 167 | set_bit(XPT_BUSY, &xprt->xpt_flags); |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 168 | rpc_init_wait_queue(&xprt->xpt_bc_pending, "xpt_bc_pending"); |
Stanislav Kinsbursky | bd4620d | 2011-12-06 14:19:10 +0300 | [diff] [blame] | 169 | xprt->xpt_net = get_net(net); |
Tom Tucker | 1d8206b9 | 2007-12-30 21:07:15 -0600 | [diff] [blame] | 170 | } |
| 171 | EXPORT_SYMBOL_GPL(svc_xprt_init); |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 172 | |
Chuck Lever | 5dd248f | 2008-06-30 18:45:37 -0400 | [diff] [blame] | 173 | static struct svc_xprt *__svc_xpo_create(struct svc_xprt_class *xcl, |
| 174 | struct svc_serv *serv, |
Pavel Emelyanov | 62832c0 | 2010-09-29 16:04:18 +0400 | [diff] [blame] | 175 | struct net *net, |
Chuck Lever | 9652ada | 2009-03-18 20:46:21 -0400 | [diff] [blame] | 176 | const int family, |
| 177 | const unsigned short port, |
| 178 | int flags) |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 179 | { |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 180 | struct sockaddr_in sin = { |
| 181 | .sin_family = AF_INET, |
Al Viro | e6f1ceb | 2008-03-17 22:44:53 -0700 | [diff] [blame] | 182 | .sin_addr.s_addr = htonl(INADDR_ANY), |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 183 | .sin_port = htons(port), |
| 184 | }; |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 185 | #if IS_ENABLED(CONFIG_IPV6) |
Chuck Lever | 5dd248f | 2008-06-30 18:45:37 -0400 | [diff] [blame] | 186 | struct sockaddr_in6 sin6 = { |
| 187 | .sin6_family = AF_INET6, |
| 188 | .sin6_addr = IN6ADDR_ANY_INIT, |
| 189 | .sin6_port = htons(port), |
| 190 | }; |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 191 | #endif |
Chuck Lever | 5dd248f | 2008-06-30 18:45:37 -0400 | [diff] [blame] | 192 | struct sockaddr *sap; |
| 193 | size_t len; |
| 194 | |
Chuck Lever | 9652ada | 2009-03-18 20:46:21 -0400 | [diff] [blame] | 195 | switch (family) { |
| 196 | case PF_INET: |
Chuck Lever | 5dd248f | 2008-06-30 18:45:37 -0400 | [diff] [blame] | 197 | sap = (struct sockaddr *)&sin; |
| 198 | len = sizeof(sin); |
| 199 | break; |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 200 | #if IS_ENABLED(CONFIG_IPV6) |
Chuck Lever | 9652ada | 2009-03-18 20:46:21 -0400 | [diff] [blame] | 201 | case PF_INET6: |
Chuck Lever | 5dd248f | 2008-06-30 18:45:37 -0400 | [diff] [blame] | 202 | sap = (struct sockaddr *)&sin6; |
| 203 | len = sizeof(sin6); |
| 204 | break; |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 205 | #endif |
Chuck Lever | 5dd248f | 2008-06-30 18:45:37 -0400 | [diff] [blame] | 206 | default: |
| 207 | return ERR_PTR(-EAFNOSUPPORT); |
| 208 | } |
| 209 | |
Pavel Emelyanov | 62832c0 | 2010-09-29 16:04:18 +0400 | [diff] [blame] | 210 | return xcl->xcl_ops->xpo_create(serv, net, sap, len, flags); |
Chuck Lever | 5dd248f | 2008-06-30 18:45:37 -0400 | [diff] [blame] | 211 | } |
| 212 | |
J. Bruce Fields | 6741019 | 2012-08-17 22:12:19 -0400 | [diff] [blame] | 213 | /* |
| 214 | * svc_xprt_received conditionally queues the transport for processing |
| 215 | * by another thread. The caller must hold the XPT_BUSY bit and must |
| 216 | * not thereafter touch transport data. |
| 217 | * |
| 218 | * Note: XPT_DATA only gets cleared when a read-attempt finds no (or |
| 219 | * insufficient) data. |
| 220 | */ |
| 221 | static void svc_xprt_received(struct svc_xprt *xprt) |
| 222 | { |
Weston Andros Adamson | ff1fdb9 | 2012-10-23 10:43:40 -0400 | [diff] [blame] | 223 | WARN_ON_ONCE(!test_bit(XPT_BUSY, &xprt->xpt_flags)); |
| 224 | if (!test_bit(XPT_BUSY, &xprt->xpt_flags)) |
| 225 | return; |
J. Bruce Fields | 6741019 | 2012-08-17 22:12:19 -0400 | [diff] [blame] | 226 | /* As soon as we clear busy, the xprt could be closed and |
Trond Myklebust | 0971374 | 2014-07-24 23:59:31 -0400 | [diff] [blame] | 227 | * 'put', so we need a reference to call svc_xprt_do_enqueue with: |
J. Bruce Fields | 6741019 | 2012-08-17 22:12:19 -0400 | [diff] [blame] | 228 | */ |
| 229 | svc_xprt_get(xprt); |
Trond Myklebust | 0971374 | 2014-07-24 23:59:31 -0400 | [diff] [blame] | 230 | smp_mb__before_atomic(); |
J. Bruce Fields | 6741019 | 2012-08-17 22:12:19 -0400 | [diff] [blame] | 231 | clear_bit(XPT_BUSY, &xprt->xpt_flags); |
Trond Myklebust | 0971374 | 2014-07-24 23:59:31 -0400 | [diff] [blame] | 232 | svc_xprt_do_enqueue(xprt); |
J. Bruce Fields | 6741019 | 2012-08-17 22:12:19 -0400 | [diff] [blame] | 233 | svc_xprt_put(xprt); |
| 234 | } |
| 235 | |
J. Bruce Fields | 39b5530 | 2012-08-14 15:50:34 -0400 | [diff] [blame] | 236 | void svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *new) |
| 237 | { |
| 238 | clear_bit(XPT_TEMP, &new->xpt_flags); |
| 239 | spin_lock_bh(&serv->sv_lock); |
| 240 | list_add(&new->xpt_list, &serv->sv_permsocks); |
| 241 | spin_unlock_bh(&serv->sv_lock); |
| 242 | svc_xprt_received(new); |
| 243 | } |
| 244 | |
Chuck Lever | 9652ada | 2009-03-18 20:46:21 -0400 | [diff] [blame] | 245 | int svc_create_xprt(struct svc_serv *serv, const char *xprt_name, |
Pavel Emelyanov | fc5d00b | 2010-09-29 16:03:50 +0400 | [diff] [blame] | 246 | struct net *net, const int family, |
| 247 | const unsigned short port, int flags) |
Chuck Lever | 5dd248f | 2008-06-30 18:45:37 -0400 | [diff] [blame] | 248 | { |
| 249 | struct svc_xprt_class *xcl; |
| 250 | |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 251 | dprintk("svc: creating transport %s[%d]\n", xprt_name, port); |
| 252 | spin_lock(&svc_xprt_class_lock); |
| 253 | list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) { |
Tom Tucker | 4e5caaa | 2007-12-30 21:08:20 -0600 | [diff] [blame] | 254 | struct svc_xprt *newxprt; |
NeilBrown | ed2849d | 2010-11-16 16:55:19 +1100 | [diff] [blame] | 255 | unsigned short newport; |
Tom Tucker | 4e5caaa | 2007-12-30 21:08:20 -0600 | [diff] [blame] | 256 | |
| 257 | if (strcmp(xprt_name, xcl->xcl_name)) |
| 258 | continue; |
| 259 | |
| 260 | if (!try_module_get(xcl->xcl_owner)) |
| 261 | goto err; |
| 262 | |
| 263 | spin_unlock(&svc_xprt_class_lock); |
Pavel Emelyanov | 62832c0 | 2010-09-29 16:04:18 +0400 | [diff] [blame] | 264 | newxprt = __svc_xpo_create(xcl, serv, net, family, port, flags); |
Tom Tucker | 4e5caaa | 2007-12-30 21:08:20 -0600 | [diff] [blame] | 265 | if (IS_ERR(newxprt)) { |
| 266 | module_put(xcl->xcl_owner); |
| 267 | return PTR_ERR(newxprt); |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 268 | } |
J. Bruce Fields | 39b5530 | 2012-08-14 15:50:34 -0400 | [diff] [blame] | 269 | svc_add_new_perm_xprt(serv, newxprt); |
NeilBrown | ed2849d | 2010-11-16 16:55:19 +1100 | [diff] [blame] | 270 | newport = svc_xprt_local_port(newxprt); |
NeilBrown | ed2849d | 2010-11-16 16:55:19 +1100 | [diff] [blame] | 271 | return newport; |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 272 | } |
Tom Tucker | 4e5caaa | 2007-12-30 21:08:20 -0600 | [diff] [blame] | 273 | err: |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 274 | spin_unlock(&svc_xprt_class_lock); |
| 275 | dprintk("svc: transport %s not found\n", xprt_name); |
Chuck Lever | 6871790 | 2010-01-26 14:04:13 -0500 | [diff] [blame] | 276 | |
| 277 | /* This errno is exposed to user space. Provide a reasonable |
| 278 | * perror msg for a bad transport. */ |
| 279 | return -EPROTONOSUPPORT; |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 280 | } |
| 281 | EXPORT_SYMBOL_GPL(svc_create_xprt); |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 282 | |
| 283 | /* |
| 284 | * Copy the local and remote xprt addresses to the rqstp structure |
| 285 | */ |
| 286 | void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt) |
| 287 | { |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 288 | memcpy(&rqstp->rq_addr, &xprt->xpt_remote, xprt->xpt_remotelen); |
| 289 | rqstp->rq_addrlen = xprt->xpt_remotelen; |
| 290 | |
| 291 | /* |
| 292 | * Destination address in request is needed for binding the |
| 293 | * source address in RPC replies/callbacks later. |
| 294 | */ |
Mi Jinlong | 849a1cf | 2011-08-30 17:18:41 +0800 | [diff] [blame] | 295 | memcpy(&rqstp->rq_daddr, &xprt->xpt_local, xprt->xpt_locallen); |
| 296 | rqstp->rq_daddrlen = xprt->xpt_locallen; |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 297 | } |
| 298 | EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs); |
| 299 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 300 | /** |
| 301 | * svc_print_addr - Format rq_addr field for printing |
| 302 | * @rqstp: svc_rqst struct containing address to print |
| 303 | * @buf: target buffer for formatted address |
| 304 | * @len: length of target buffer |
| 305 | * |
| 306 | */ |
| 307 | char *svc_print_addr(struct svc_rqst *rqstp, char *buf, size_t len) |
| 308 | { |
| 309 | return __svc_print_addr(svc_addr(rqstp), buf, len); |
| 310 | } |
| 311 | EXPORT_SYMBOL_GPL(svc_print_addr); |
| 312 | |
J. Bruce Fields | 9c335c0 | 2010-10-26 11:32:03 -0400 | [diff] [blame] | 313 | static bool svc_xprt_has_something_to_do(struct svc_xprt *xprt) |
| 314 | { |
| 315 | if (xprt->xpt_flags & ((1<<XPT_CONN)|(1<<XPT_CLOSE))) |
| 316 | return true; |
| 317 | if (xprt->xpt_flags & ((1<<XPT_DATA)|(1<<XPT_DEFERRED))) |
| 318 | return xprt->xpt_ops->xpo_has_wspace(xprt); |
| 319 | return false; |
| 320 | } |
| 321 | |
Trond Myklebust | 0971374 | 2014-07-24 23:59:31 -0400 | [diff] [blame] | 322 | static void svc_xprt_do_enqueue(struct svc_xprt *xprt) |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 323 | { |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 324 | struct svc_pool *pool; |
Jeff Layton | 83a712e | 2014-11-21 14:19:31 -0500 | [diff] [blame^] | 325 | struct svc_rqst *rqstp = NULL; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 326 | int cpu; |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 327 | bool queued = false; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 328 | |
J. Bruce Fields | 9c335c0 | 2010-10-26 11:32:03 -0400 | [diff] [blame] | 329 | if (!svc_xprt_has_something_to_do(xprt)) |
Jeff Layton | 83a712e | 2014-11-21 14:19:31 -0500 | [diff] [blame^] | 330 | goto out; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 331 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 332 | /* Mark transport as busy. It will remain in this state until |
| 333 | * the provider calls svc_xprt_received. We update XPT_BUSY |
| 334 | * atomically because it also guards against trying to enqueue |
| 335 | * the transport twice. |
| 336 | */ |
| 337 | if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) { |
| 338 | /* Don't enqueue transport while already enqueued */ |
| 339 | dprintk("svc: transport %p busy, not enqueued\n", xprt); |
Jeff Layton | 83a712e | 2014-11-21 14:19:31 -0500 | [diff] [blame^] | 340 | goto out; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 341 | } |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 342 | |
Trond Myklebust | 0c0746d | 2014-08-03 13:03:12 -0400 | [diff] [blame] | 343 | cpu = get_cpu(); |
| 344 | pool = svc_pool_for_cpu(xprt->xpt_server, cpu); |
Trond Myklebust | 0c0746d | 2014-08-03 13:03:12 -0400 | [diff] [blame] | 345 | |
Jeff Layton | 403c7b4 | 2014-11-21 14:19:29 -0500 | [diff] [blame] | 346 | atomic_long_inc(&pool->sp_stats.packets); |
Trond Myklebust | 0c0746d | 2014-08-03 13:03:12 -0400 | [diff] [blame] | 347 | |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 348 | redo_search: |
| 349 | /* find a thread for this xprt */ |
| 350 | rcu_read_lock(); |
| 351 | list_for_each_entry_rcu(rqstp, &pool->sp_all_threads, rq_all) { |
| 352 | /* Do a lockless check first */ |
| 353 | if (test_bit(RQ_BUSY, &rqstp->rq_flags)) |
| 354 | continue; |
| 355 | |
| 356 | /* |
| 357 | * Once the xprt has been queued, it can only be dequeued by |
| 358 | * the task that intends to service it. All we can do at that |
| 359 | * point is to try to wake this thread back up so that it can |
| 360 | * do so. |
Trond Myklebust | 983c684 | 2014-08-03 13:03:10 -0400 | [diff] [blame] | 361 | */ |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 362 | if (!queued) { |
| 363 | spin_lock_bh(&rqstp->rq_lock); |
| 364 | if (test_and_set_bit(RQ_BUSY, &rqstp->rq_flags)) { |
| 365 | /* already busy, move on... */ |
| 366 | spin_unlock_bh(&rqstp->rq_lock); |
| 367 | continue; |
| 368 | } |
| 369 | |
| 370 | /* this one will do */ |
| 371 | rqstp->rq_xprt = xprt; |
| 372 | svc_xprt_get(xprt); |
| 373 | spin_unlock_bh(&rqstp->rq_lock); |
| 374 | } |
| 375 | rcu_read_unlock(); |
| 376 | |
Jeff Layton | 403c7b4 | 2014-11-21 14:19:29 -0500 | [diff] [blame] | 377 | atomic_long_inc(&pool->sp_stats.threads_woken); |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 378 | wake_up_process(rqstp->rq_task); |
| 379 | put_cpu(); |
Jeff Layton | 83a712e | 2014-11-21 14:19:31 -0500 | [diff] [blame^] | 380 | goto out; |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 381 | } |
| 382 | rcu_read_unlock(); |
| 383 | |
| 384 | /* |
| 385 | * We didn't find an idle thread to use, so we need to queue the xprt. |
| 386 | * Do so and then search again. If we find one, we can't hook this one |
| 387 | * up to it directly but we can wake the thread up in the hopes that it |
| 388 | * will pick it up once it searches for a xprt to service. |
| 389 | */ |
| 390 | if (!queued) { |
| 391 | queued = true; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 392 | dprintk("svc: transport %p put into queue\n", xprt); |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 393 | spin_lock_bh(&pool->sp_lock); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 394 | list_add_tail(&xprt->xpt_ready, &pool->sp_sockets); |
Greg Banks | 03cf6c9 | 2009-01-13 21:26:36 +1100 | [diff] [blame] | 395 | pool->sp_stats.sockets_queued++; |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 396 | spin_unlock_bh(&pool->sp_lock); |
| 397 | goto redo_search; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 398 | } |
Jeff Layton | 83a712e | 2014-11-21 14:19:31 -0500 | [diff] [blame^] | 399 | rqstp = NULL; |
Trond Myklebust | 983c684 | 2014-08-03 13:03:10 -0400 | [diff] [blame] | 400 | put_cpu(); |
Jeff Layton | 83a712e | 2014-11-21 14:19:31 -0500 | [diff] [blame^] | 401 | out: |
| 402 | trace_svc_xprt_do_enqueue(xprt, rqstp); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 403 | } |
Trond Myklebust | 0971374 | 2014-07-24 23:59:31 -0400 | [diff] [blame] | 404 | |
| 405 | /* |
| 406 | * Queue up a transport with data pending. If there are idle nfsd |
| 407 | * processes, wake 'em up. |
| 408 | * |
| 409 | */ |
| 410 | void svc_xprt_enqueue(struct svc_xprt *xprt) |
| 411 | { |
| 412 | if (test_bit(XPT_BUSY, &xprt->xpt_flags)) |
| 413 | return; |
| 414 | svc_xprt_do_enqueue(xprt); |
| 415 | } |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 416 | EXPORT_SYMBOL_GPL(svc_xprt_enqueue); |
| 417 | |
| 418 | /* |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 419 | * Dequeue the first transport, if there is one. |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 420 | */ |
| 421 | static struct svc_xprt *svc_xprt_dequeue(struct svc_pool *pool) |
| 422 | { |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 423 | struct svc_xprt *xprt = NULL; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 424 | |
| 425 | if (list_empty(&pool->sp_sockets)) |
Jeff Layton | 83a712e | 2014-11-21 14:19:31 -0500 | [diff] [blame^] | 426 | goto out; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 427 | |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 428 | spin_lock_bh(&pool->sp_lock); |
| 429 | if (likely(!list_empty(&pool->sp_sockets))) { |
| 430 | xprt = list_first_entry(&pool->sp_sockets, |
| 431 | struct svc_xprt, xpt_ready); |
| 432 | list_del_init(&xprt->xpt_ready); |
| 433 | svc_xprt_get(xprt); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 434 | |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 435 | dprintk("svc: transport %p dequeued, inuse=%d\n", |
| 436 | xprt, atomic_read(&xprt->xpt_ref.refcount)); |
| 437 | } |
| 438 | spin_unlock_bh(&pool->sp_lock); |
Jeff Layton | 83a712e | 2014-11-21 14:19:31 -0500 | [diff] [blame^] | 439 | out: |
| 440 | trace_svc_xprt_dequeue(xprt); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 441 | return xprt; |
| 442 | } |
| 443 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 444 | /** |
| 445 | * svc_reserve - change the space reserved for the reply to a request. |
| 446 | * @rqstp: The request in question |
| 447 | * @space: new max space to reserve |
| 448 | * |
| 449 | * Each request reserves some space on the output queue of the transport |
| 450 | * to make sure the reply fits. This function reduces that reserved |
| 451 | * space to be the amount of space used already, plus @space. |
| 452 | * |
| 453 | */ |
| 454 | void svc_reserve(struct svc_rqst *rqstp, int space) |
| 455 | { |
| 456 | space += rqstp->rq_res.head[0].iov_len; |
| 457 | |
| 458 | if (space < rqstp->rq_reserved) { |
| 459 | struct svc_xprt *xprt = rqstp->rq_xprt; |
| 460 | atomic_sub((rqstp->rq_reserved - space), &xprt->xpt_reserved); |
| 461 | rqstp->rq_reserved = space; |
| 462 | |
Trond Myklebust | 5187768 | 2014-07-24 23:59:33 -0400 | [diff] [blame] | 463 | if (xprt->xpt_ops->xpo_adjust_wspace) |
| 464 | xprt->xpt_ops->xpo_adjust_wspace(xprt); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 465 | svc_xprt_enqueue(xprt); |
| 466 | } |
| 467 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 468 | EXPORT_SYMBOL_GPL(svc_reserve); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 469 | |
| 470 | static void svc_xprt_release(struct svc_rqst *rqstp) |
| 471 | { |
| 472 | struct svc_xprt *xprt = rqstp->rq_xprt; |
| 473 | |
| 474 | rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); |
| 475 | |
Tom Tucker | 2779e3a | 2009-01-05 11:12:52 -0600 | [diff] [blame] | 476 | kfree(rqstp->rq_deferred); |
| 477 | rqstp->rq_deferred = NULL; |
| 478 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 479 | svc_free_res_pages(rqstp); |
| 480 | rqstp->rq_res.page_len = 0; |
| 481 | rqstp->rq_res.page_base = 0; |
| 482 | |
| 483 | /* Reset response buffer and release |
| 484 | * the reservation. |
| 485 | * But first, check that enough space was reserved |
| 486 | * for the reply, otherwise we have a bug! |
| 487 | */ |
| 488 | if ((rqstp->rq_res.len) > rqstp->rq_reserved) |
| 489 | printk(KERN_ERR "RPC request reserved %d but used %d\n", |
| 490 | rqstp->rq_reserved, |
| 491 | rqstp->rq_res.len); |
| 492 | |
| 493 | rqstp->rq_res.head[0].iov_len = 0; |
| 494 | svc_reserve(rqstp, 0); |
| 495 | rqstp->rq_xprt = NULL; |
| 496 | |
| 497 | svc_xprt_put(xprt); |
| 498 | } |
| 499 | |
| 500 | /* |
Jeff Layton | ceff739 | 2014-11-19 07:51:21 -0500 | [diff] [blame] | 501 | * Some svc_serv's will have occasional work to do, even when a xprt is not |
| 502 | * waiting to be serviced. This function is there to "kick" a task in one of |
| 503 | * those services so that it can wake up and do that work. Note that we only |
| 504 | * bother with pool 0 as we don't need to wake up more than one thread for |
| 505 | * this purpose. |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 506 | */ |
| 507 | void svc_wake_up(struct svc_serv *serv) |
| 508 | { |
| 509 | struct svc_rqst *rqstp; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 510 | struct svc_pool *pool; |
| 511 | |
Jeff Layton | ceff739 | 2014-11-19 07:51:21 -0500 | [diff] [blame] | 512 | pool = &serv->sv_pools[0]; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 513 | |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 514 | rcu_read_lock(); |
| 515 | list_for_each_entry_rcu(rqstp, &pool->sp_all_threads, rq_all) { |
| 516 | /* skip any that aren't queued */ |
| 517 | if (test_bit(RQ_BUSY, &rqstp->rq_flags)) |
| 518 | continue; |
| 519 | rcu_read_unlock(); |
Jeff Layton | ceff739 | 2014-11-19 07:51:21 -0500 | [diff] [blame] | 520 | dprintk("svc: daemon %p woken up.\n", rqstp); |
| 521 | wake_up_process(rqstp->rq_task); |
Jeff Layton | 83a712e | 2014-11-21 14:19:31 -0500 | [diff] [blame^] | 522 | trace_svc_wake_up(rqstp->rq_task->pid); |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 523 | return; |
| 524 | } |
| 525 | rcu_read_unlock(); |
| 526 | |
| 527 | /* No free entries available */ |
| 528 | set_bit(SP_TASK_PENDING, &pool->sp_flags); |
| 529 | smp_wmb(); |
Jeff Layton | 83a712e | 2014-11-21 14:19:31 -0500 | [diff] [blame^] | 530 | trace_svc_wake_up(0); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 531 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 532 | EXPORT_SYMBOL_GPL(svc_wake_up); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 533 | |
| 534 | int svc_port_is_privileged(struct sockaddr *sin) |
| 535 | { |
| 536 | switch (sin->sa_family) { |
| 537 | case AF_INET: |
| 538 | return ntohs(((struct sockaddr_in *)sin)->sin_port) |
| 539 | < PROT_SOCK; |
| 540 | case AF_INET6: |
| 541 | return ntohs(((struct sockaddr_in6 *)sin)->sin6_port) |
| 542 | < PROT_SOCK; |
| 543 | default: |
| 544 | return 0; |
| 545 | } |
| 546 | } |
| 547 | |
| 548 | /* |
Jeff Layton | c9233eb | 2008-10-20 11:51:57 -0400 | [diff] [blame] | 549 | * Make sure that we don't have too many active connections. If we have, |
| 550 | * something must be dropped. It's not clear what will happen if we allow |
| 551 | * "too many" connections, but when dealing with network-facing software, |
| 552 | * we have to code defensively. Here we do that by imposing hard limits. |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 553 | * |
| 554 | * There's no point in trying to do random drop here for DoS |
| 555 | * prevention. The NFS clients does 1 reconnect in 15 seconds. An |
| 556 | * attacker can easily beat that. |
| 557 | * |
| 558 | * The only somewhat efficient mechanism would be if drop old |
| 559 | * connections from the same IP first. But right now we don't even |
| 560 | * record the client IP in svc_sock. |
Jeff Layton | c9233eb | 2008-10-20 11:51:57 -0400 | [diff] [blame] | 561 | * |
| 562 | * single-threaded services that expect a lot of clients will probably |
| 563 | * need to set sv_maxconn to override the default value which is based |
| 564 | * on the number of threads |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 565 | */ |
| 566 | static void svc_check_conn_limits(struct svc_serv *serv) |
| 567 | { |
Jeff Layton | c9233eb | 2008-10-20 11:51:57 -0400 | [diff] [blame] | 568 | unsigned int limit = serv->sv_maxconn ? serv->sv_maxconn : |
| 569 | (serv->sv_nrthreads+3) * 20; |
| 570 | |
| 571 | if (serv->sv_tmpcnt > limit) { |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 572 | struct svc_xprt *xprt = NULL; |
| 573 | spin_lock_bh(&serv->sv_lock); |
| 574 | if (!list_empty(&serv->sv_tempsocks)) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 575 | /* Try to help the admin */ |
| 576 | net_notice_ratelimited("%s: too many open connections, consider increasing the %s\n", |
| 577 | serv->sv_name, serv->sv_maxconn ? |
| 578 | "max number of connections" : |
| 579 | "number of threads"); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 580 | /* |
| 581 | * Always select the oldest connection. It's not fair, |
| 582 | * but so is life |
| 583 | */ |
| 584 | xprt = list_entry(serv->sv_tempsocks.prev, |
| 585 | struct svc_xprt, |
| 586 | xpt_list); |
| 587 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
| 588 | svc_xprt_get(xprt); |
| 589 | } |
| 590 | spin_unlock_bh(&serv->sv_lock); |
| 591 | |
| 592 | if (xprt) { |
| 593 | svc_xprt_enqueue(xprt); |
| 594 | svc_xprt_put(xprt); |
| 595 | } |
| 596 | } |
| 597 | } |
| 598 | |
Rashika Kheria | e1d83ee | 2014-02-09 22:33:03 +0530 | [diff] [blame] | 599 | static int svc_alloc_arg(struct svc_rqst *rqstp) |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 600 | { |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 601 | struct svc_serv *serv = rqstp->rq_server; |
| 602 | struct xdr_buf *arg; |
| 603 | int pages; |
| 604 | int i; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 605 | |
| 606 | /* now allocate needed pages. If we get a failure, sleep briefly */ |
| 607 | pages = (serv->sv_max_mesg + PAGE_SIZE) / PAGE_SIZE; |
Weston Andros Adamson | b25cd05 | 2012-10-23 10:43:41 -0400 | [diff] [blame] | 608 | WARN_ON_ONCE(pages >= RPCSVC_MAXPAGES); |
| 609 | if (pages >= RPCSVC_MAXPAGES) |
| 610 | /* use as many pages as possible */ |
| 611 | pages = RPCSVC_MAXPAGES - 1; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 612 | for (i = 0; i < pages ; i++) |
| 613 | while (rqstp->rq_pages[i] == NULL) { |
| 614 | struct page *p = alloc_page(GFP_KERNEL); |
| 615 | if (!p) { |
Jeff Layton | 7b54fe6 | 2008-02-12 11:47:24 -0500 | [diff] [blame] | 616 | set_current_state(TASK_INTERRUPTIBLE); |
| 617 | if (signalled() || kthread_should_stop()) { |
| 618 | set_current_state(TASK_RUNNING); |
Jeff Layton | 7086721 | 2008-02-07 16:34:54 -0500 | [diff] [blame] | 619 | return -EINTR; |
Jeff Layton | 7b54fe6 | 2008-02-12 11:47:24 -0500 | [diff] [blame] | 620 | } |
| 621 | schedule_timeout(msecs_to_jiffies(500)); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 622 | } |
| 623 | rqstp->rq_pages[i] = p; |
| 624 | } |
J. Bruce Fields | 2825a7f | 2013-08-26 16:04:46 -0400 | [diff] [blame] | 625 | rqstp->rq_page_end = &rqstp->rq_pages[i]; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 626 | rqstp->rq_pages[i++] = NULL; /* this might be seen in nfs_read_actor */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 627 | |
| 628 | /* Make arg->head point to first page and arg->pages point to rest */ |
| 629 | arg = &rqstp->rq_arg; |
| 630 | arg->head[0].iov_base = page_address(rqstp->rq_pages[0]); |
| 631 | arg->head[0].iov_len = PAGE_SIZE; |
| 632 | arg->pages = rqstp->rq_pages + 1; |
| 633 | arg->page_base = 0; |
| 634 | /* save at least one page for response */ |
| 635 | arg->page_len = (pages-2)*PAGE_SIZE; |
| 636 | arg->len = (pages-1)*PAGE_SIZE; |
| 637 | arg->tail[0].iov_len = 0; |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 638 | return 0; |
| 639 | } |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 640 | |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 641 | static bool |
| 642 | rqst_should_sleep(struct svc_rqst *rqstp) |
| 643 | { |
| 644 | struct svc_pool *pool = rqstp->rq_pool; |
| 645 | |
| 646 | /* did someone call svc_wake_up? */ |
| 647 | if (test_and_clear_bit(SP_TASK_PENDING, &pool->sp_flags)) |
| 648 | return false; |
| 649 | |
| 650 | /* was a socket queued? */ |
| 651 | if (!list_empty(&pool->sp_sockets)) |
| 652 | return false; |
| 653 | |
| 654 | /* are we shutting down? */ |
| 655 | if (signalled() || kthread_should_stop()) |
| 656 | return false; |
| 657 | |
| 658 | /* are we freezing? */ |
| 659 | if (freezing(current)) |
| 660 | return false; |
| 661 | |
| 662 | return true; |
| 663 | } |
| 664 | |
Rashika Kheria | e1d83ee | 2014-02-09 22:33:03 +0530 | [diff] [blame] | 665 | static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout) |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 666 | { |
| 667 | struct svc_xprt *xprt; |
| 668 | struct svc_pool *pool = rqstp->rq_pool; |
Trond Myklebust | a4aa805 | 2014-08-03 13:03:11 -0400 | [diff] [blame] | 669 | long time_left = 0; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 670 | |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 671 | /* rq_xprt should be clear on entry */ |
| 672 | WARN_ON_ONCE(rqstp->rq_xprt); |
| 673 | |
NeilBrown | f16b6e8 | 2010-08-12 17:04:06 +1000 | [diff] [blame] | 674 | /* Normally we will wait up to 5 seconds for any required |
| 675 | * cache information to be provided. |
| 676 | */ |
| 677 | rqstp->rq_chandle.thread_wait = 5*HZ; |
| 678 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 679 | xprt = svc_xprt_dequeue(pool); |
| 680 | if (xprt) { |
| 681 | rqstp->rq_xprt = xprt; |
NeilBrown | f16b6e8 | 2010-08-12 17:04:06 +1000 | [diff] [blame] | 682 | |
| 683 | /* As there is a shortage of threads and this request |
J. Bruce Fields | 6610f72 | 2010-08-26 13:19:52 -0400 | [diff] [blame] | 684 | * had to be queued, don't allow the thread to wait so |
NeilBrown | f16b6e8 | 2010-08-12 17:04:06 +1000 | [diff] [blame] | 685 | * long for cache updates. |
| 686 | */ |
| 687 | rqstp->rq_chandle.thread_wait = 1*HZ; |
Jeff Layton | 4d5db3f | 2014-11-19 07:51:20 -0500 | [diff] [blame] | 688 | clear_bit(SP_TASK_PENDING, &pool->sp_flags); |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 689 | return xprt; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 690 | } |
Jeff Layton | b1691bc | 2014-11-21 14:19:30 -0500 | [diff] [blame] | 691 | |
| 692 | /* |
| 693 | * We have to be able to interrupt this wait |
| 694 | * to bring down the daemons ... |
| 695 | */ |
| 696 | set_current_state(TASK_INTERRUPTIBLE); |
| 697 | clear_bit(RQ_BUSY, &rqstp->rq_flags); |
| 698 | smp_mb(); |
| 699 | |
| 700 | if (likely(rqst_should_sleep(rqstp))) |
| 701 | time_left = schedule_timeout(timeout); |
| 702 | else |
| 703 | __set_current_state(TASK_RUNNING); |
| 704 | |
| 705 | try_to_freeze(); |
| 706 | |
| 707 | spin_lock_bh(&rqstp->rq_lock); |
| 708 | set_bit(RQ_BUSY, &rqstp->rq_flags); |
| 709 | spin_unlock_bh(&rqstp->rq_lock); |
| 710 | |
| 711 | xprt = rqstp->rq_xprt; |
| 712 | if (xprt != NULL) |
| 713 | return xprt; |
| 714 | |
| 715 | if (!time_left) |
| 716 | atomic_long_inc(&pool->sp_stats.threads_timedout); |
| 717 | |
| 718 | if (signalled() || kthread_should_stop()) |
| 719 | return ERR_PTR(-EINTR); |
| 720 | return ERR_PTR(-EAGAIN); |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 721 | } |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 722 | |
Rashika Kheria | e1d83ee | 2014-02-09 22:33:03 +0530 | [diff] [blame] | 723 | static void svc_add_new_temp_xprt(struct svc_serv *serv, struct svc_xprt *newxpt) |
J. Bruce Fields | 65b2e66 | 2012-08-18 15:44:33 -0400 | [diff] [blame] | 724 | { |
| 725 | spin_lock_bh(&serv->sv_lock); |
| 726 | set_bit(XPT_TEMP, &newxpt->xpt_flags); |
| 727 | list_add(&newxpt->xpt_list, &serv->sv_tempsocks); |
| 728 | serv->sv_tmpcnt++; |
| 729 | if (serv->sv_temptimer.function == NULL) { |
| 730 | /* setup timer to age temp transports */ |
| 731 | setup_timer(&serv->sv_temptimer, svc_age_temp_xprts, |
| 732 | (unsigned long)serv); |
| 733 | mod_timer(&serv->sv_temptimer, |
| 734 | jiffies + svc_conn_age_period * HZ); |
| 735 | } |
| 736 | spin_unlock_bh(&serv->sv_lock); |
| 737 | svc_xprt_received(newxpt); |
| 738 | } |
| 739 | |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 740 | static int svc_handle_xprt(struct svc_rqst *rqstp, struct svc_xprt *xprt) |
| 741 | { |
| 742 | struct svc_serv *serv = rqstp->rq_server; |
| 743 | int len = 0; |
| 744 | |
J. Bruce Fields | 1b644b6 | 2010-02-28 16:33:31 -0500 | [diff] [blame] | 745 | if (test_bit(XPT_CLOSE, &xprt->xpt_flags)) { |
| 746 | dprintk("svc_recv: found XPT_CLOSE\n"); |
| 747 | svc_delete_xprt(xprt); |
J. Bruce Fields | ca7896c | 2010-10-25 14:12:40 -0400 | [diff] [blame] | 748 | /* Leave XPT_BUSY set on the dead xprt: */ |
Jeff Layton | 83a712e | 2014-11-21 14:19:31 -0500 | [diff] [blame^] | 749 | goto out; |
J. Bruce Fields | ca7896c | 2010-10-25 14:12:40 -0400 | [diff] [blame] | 750 | } |
| 751 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 752 | struct svc_xprt *newxpt; |
J. Bruce Fields | 65b2e66 | 2012-08-18 15:44:33 -0400 | [diff] [blame] | 753 | /* |
| 754 | * We know this module_get will succeed because the |
| 755 | * listener holds a reference too |
| 756 | */ |
| 757 | __module_get(xprt->xpt_class->xcl_owner); |
| 758 | svc_check_conn_limits(xprt->xpt_server); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 759 | newxpt = xprt->xpt_ops->xpo_accept(xprt); |
J. Bruce Fields | 65b2e66 | 2012-08-18 15:44:33 -0400 | [diff] [blame] | 760 | if (newxpt) |
| 761 | svc_add_new_temp_xprt(serv, newxpt); |
Trond Myklebust | c789102 | 2014-05-18 14:05:22 -0400 | [diff] [blame] | 762 | else |
| 763 | module_put(xprt->xpt_class->xcl_owner); |
Trond Myklebust | 9e5b208 | 2014-08-03 13:03:06 -0400 | [diff] [blame] | 764 | } else { |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 765 | /* XPT_DATA|XPT_DEFERRED case: */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 766 | dprintk("svc: server %p, pool %u, transport %p, inuse=%d\n", |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 767 | rqstp, rqstp->rq_pool->sp_id, xprt, |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 768 | atomic_read(&xprt->xpt_ref.refcount)); |
| 769 | rqstp->rq_deferred = svc_deferred_dequeue(xprt); |
J. Bruce Fields | ca7896c | 2010-10-25 14:12:40 -0400 | [diff] [blame] | 770 | if (rqstp->rq_deferred) |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 771 | len = svc_deferred_recv(rqstp); |
J. Bruce Fields | ca7896c | 2010-10-25 14:12:40 -0400 | [diff] [blame] | 772 | else |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 773 | len = xprt->xpt_ops->xpo_recvfrom(rqstp); |
| 774 | dprintk("svc: got len=%d\n", len); |
J. Bruce Fields | d10f27a | 2012-08-17 17:31:53 -0400 | [diff] [blame] | 775 | rqstp->rq_reserved = serv->sv_max_mesg; |
| 776 | atomic_add(rqstp->rq_reserved, &xprt->xpt_reserved); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 777 | } |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 778 | /* clear XPT_BUSY: */ |
J. Bruce Fields | ca7896c | 2010-10-25 14:12:40 -0400 | [diff] [blame] | 779 | svc_xprt_received(xprt); |
Jeff Layton | 83a712e | 2014-11-21 14:19:31 -0500 | [diff] [blame^] | 780 | out: |
| 781 | trace_svc_handle_xprt(xprt, len); |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 782 | return len; |
| 783 | } |
| 784 | |
| 785 | /* |
| 786 | * Receive the next request on any transport. This code is carefully |
| 787 | * organised not to touch any cachelines in the shared svc_serv |
| 788 | * structure, only cachelines in the local svc_pool. |
| 789 | */ |
| 790 | int svc_recv(struct svc_rqst *rqstp, long timeout) |
| 791 | { |
| 792 | struct svc_xprt *xprt = NULL; |
| 793 | struct svc_serv *serv = rqstp->rq_server; |
| 794 | int len, err; |
| 795 | |
| 796 | dprintk("svc: server %p waiting for data (to = %ld)\n", |
| 797 | rqstp, timeout); |
| 798 | |
| 799 | if (rqstp->rq_xprt) |
| 800 | printk(KERN_ERR |
| 801 | "svc_recv: service %p, transport not NULL!\n", |
| 802 | rqstp); |
Trond Myklebust | 983c684 | 2014-08-03 13:03:10 -0400 | [diff] [blame] | 803 | |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 804 | err = svc_alloc_arg(rqstp); |
| 805 | if (err) |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 806 | goto out; |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 807 | |
| 808 | try_to_freeze(); |
| 809 | cond_resched(); |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 810 | err = -EINTR; |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 811 | if (signalled() || kthread_should_stop()) |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 812 | goto out; |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 813 | |
| 814 | xprt = svc_get_next_xprt(rqstp, timeout); |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 815 | if (IS_ERR(xprt)) { |
| 816 | err = PTR_ERR(xprt); |
| 817 | goto out; |
| 818 | } |
J. Bruce Fields | 6797fa5 | 2012-08-18 15:33:51 -0400 | [diff] [blame] | 819 | |
| 820 | len = svc_handle_xprt(rqstp, xprt); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 821 | |
| 822 | /* No data, incomplete (TCP) read, or accept() */ |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 823 | err = -EAGAIN; |
J. Bruce Fields | 9f9d2eb | 2012-08-17 21:35:24 -0400 | [diff] [blame] | 824 | if (len <= 0) |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 825 | goto out_release; |
J. Bruce Fields | ca7896c | 2010-10-25 14:12:40 -0400 | [diff] [blame] | 826 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 827 | clear_bit(XPT_OLD, &xprt->xpt_flags); |
| 828 | |
Jeff Layton | 4d152e2 | 2014-11-19 07:51:14 -0500 | [diff] [blame] | 829 | if (xprt->xpt_ops->xpo_secure_port(rqstp)) |
| 830 | set_bit(RQ_SECURE, &rqstp->rq_flags); |
| 831 | else |
| 832 | clear_bit(RQ_SECURE, &rqstp->rq_flags); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 833 | rqstp->rq_chandle.defer = svc_defer; |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 834 | rqstp->rq_xid = svc_getu32(&rqstp->rq_arg.head[0]); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 835 | |
| 836 | if (serv->sv_stats) |
| 837 | serv->sv_stats->netcnt++; |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 838 | trace_svc_recv(rqstp, len); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 839 | return len; |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 840 | out_release: |
J. Bruce Fields | ca7896c | 2010-10-25 14:12:40 -0400 | [diff] [blame] | 841 | rqstp->rq_res.len = 0; |
| 842 | svc_xprt_release(rqstp); |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 843 | out: |
| 844 | trace_svc_recv(rqstp, err); |
| 845 | return err; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 846 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 847 | EXPORT_SYMBOL_GPL(svc_recv); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 848 | |
| 849 | /* |
| 850 | * Drop request |
| 851 | */ |
| 852 | void svc_drop(struct svc_rqst *rqstp) |
| 853 | { |
| 854 | dprintk("svc: xprt %p dropped request\n", rqstp->rq_xprt); |
| 855 | svc_xprt_release(rqstp); |
| 856 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 857 | EXPORT_SYMBOL_GPL(svc_drop); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 858 | |
| 859 | /* |
| 860 | * Return reply to client. |
| 861 | */ |
| 862 | int svc_send(struct svc_rqst *rqstp) |
| 863 | { |
| 864 | struct svc_xprt *xprt; |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 865 | int len = -EFAULT; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 866 | struct xdr_buf *xb; |
| 867 | |
| 868 | xprt = rqstp->rq_xprt; |
| 869 | if (!xprt) |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 870 | goto out; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 871 | |
| 872 | /* release the receive skb before sending the reply */ |
| 873 | rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); |
| 874 | |
| 875 | /* calculate over-all length */ |
| 876 | xb = &rqstp->rq_res; |
| 877 | xb->len = xb->head[0].iov_len + |
| 878 | xb->page_len + |
| 879 | xb->tail[0].iov_len; |
| 880 | |
| 881 | /* Grab mutex to serialize outgoing data. */ |
| 882 | mutex_lock(&xprt->xpt_mutex); |
J. Bruce Fields | f06f00a | 2012-08-20 16:04:40 -0400 | [diff] [blame] | 883 | if (test_bit(XPT_DEAD, &xprt->xpt_flags) |
| 884 | || test_bit(XPT_CLOSE, &xprt->xpt_flags)) |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 885 | len = -ENOTCONN; |
| 886 | else |
| 887 | len = xprt->xpt_ops->xpo_sendto(rqstp); |
| 888 | mutex_unlock(&xprt->xpt_mutex); |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 889 | rpc_wake_up(&xprt->xpt_bc_pending); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 890 | svc_xprt_release(rqstp); |
| 891 | |
| 892 | if (len == -ECONNREFUSED || len == -ENOTCONN || len == -EAGAIN) |
Jeff Layton | 860a0d9 | 2014-10-28 14:24:12 -0400 | [diff] [blame] | 893 | len = 0; |
| 894 | out: |
| 895 | trace_svc_send(rqstp, len); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 896 | return len; |
| 897 | } |
| 898 | |
| 899 | /* |
| 900 | * Timer function to close old temporary transports, using |
| 901 | * a mark-and-sweep algorithm. |
| 902 | */ |
| 903 | static void svc_age_temp_xprts(unsigned long closure) |
| 904 | { |
| 905 | struct svc_serv *serv = (struct svc_serv *)closure; |
| 906 | struct svc_xprt *xprt; |
| 907 | struct list_head *le, *next; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 908 | |
| 909 | dprintk("svc_age_temp_xprts\n"); |
| 910 | |
| 911 | if (!spin_trylock_bh(&serv->sv_lock)) { |
| 912 | /* busy, try again 1 sec later */ |
| 913 | dprintk("svc_age_temp_xprts: busy\n"); |
| 914 | mod_timer(&serv->sv_temptimer, jiffies + HZ); |
| 915 | return; |
| 916 | } |
| 917 | |
| 918 | list_for_each_safe(le, next, &serv->sv_tempsocks) { |
| 919 | xprt = list_entry(le, struct svc_xprt, xpt_list); |
| 920 | |
| 921 | /* First time through, just mark it OLD. Second time |
| 922 | * through, close it. */ |
| 923 | if (!test_and_set_bit(XPT_OLD, &xprt->xpt_flags)) |
| 924 | continue; |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 925 | if (atomic_read(&xprt->xpt_ref.refcount) > 1 || |
| 926 | test_bit(XPT_BUSY, &xprt->xpt_flags)) |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 927 | continue; |
J. Bruce Fields | e75bafb | 2013-02-10 11:33:48 -0500 | [diff] [blame] | 928 | list_del_init(le); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 929 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 930 | dprintk("queuing xprt %p for closing\n", xprt); |
| 931 | |
| 932 | /* a thread will dequeue and close it soon */ |
| 933 | svc_xprt_enqueue(xprt); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 934 | } |
J. Bruce Fields | e75bafb | 2013-02-10 11:33:48 -0500 | [diff] [blame] | 935 | spin_unlock_bh(&serv->sv_lock); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 936 | |
| 937 | mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ); |
| 938 | } |
| 939 | |
J. Bruce Fields | edc7a89 | 2010-03-22 15:37:17 -0400 | [diff] [blame] | 940 | static void call_xpt_users(struct svc_xprt *xprt) |
| 941 | { |
| 942 | struct svc_xpt_user *u; |
| 943 | |
| 944 | spin_lock(&xprt->xpt_lock); |
| 945 | while (!list_empty(&xprt->xpt_users)) { |
| 946 | u = list_first_entry(&xprt->xpt_users, struct svc_xpt_user, list); |
| 947 | list_del(&u->list); |
| 948 | u->callback(u); |
| 949 | } |
| 950 | spin_unlock(&xprt->xpt_lock); |
| 951 | } |
| 952 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 953 | /* |
| 954 | * Remove a dead transport |
| 955 | */ |
J. Bruce Fields | 7710ec3 | 2011-11-25 18:44:05 -0500 | [diff] [blame] | 956 | static void svc_delete_xprt(struct svc_xprt *xprt) |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 957 | { |
| 958 | struct svc_serv *serv = xprt->xpt_server; |
Tom Tucker | 22945e4 | 2009-01-05 15:21:19 -0600 | [diff] [blame] | 959 | struct svc_deferred_req *dr; |
| 960 | |
| 961 | /* Only do this once */ |
| 962 | if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags)) |
J. Bruce Fields | ac9303e | 2010-10-23 11:16:10 -0400 | [diff] [blame] | 963 | BUG(); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 964 | |
| 965 | dprintk("svc: svc_delete_xprt(%p)\n", xprt); |
| 966 | xprt->xpt_ops->xpo_detach(xprt); |
| 967 | |
| 968 | spin_lock_bh(&serv->sv_lock); |
Jeff Layton | 8d65ef7 | 2014-11-17 17:02:57 -0500 | [diff] [blame] | 969 | list_del_init(&xprt->xpt_list); |
Weston Andros Adamson | 0104729 | 2012-10-23 10:43:48 -0400 | [diff] [blame] | 970 | WARN_ON_ONCE(!list_empty(&xprt->xpt_ready)); |
Tom Tucker | 22945e4 | 2009-01-05 15:21:19 -0600 | [diff] [blame] | 971 | if (test_bit(XPT_TEMP, &xprt->xpt_flags)) |
| 972 | serv->sv_tmpcnt--; |
J. Bruce Fields | 788e69e | 2010-03-29 21:02:31 -0400 | [diff] [blame] | 973 | spin_unlock_bh(&serv->sv_lock); |
Tom Tucker | 22945e4 | 2009-01-05 15:21:19 -0600 | [diff] [blame] | 974 | |
Neil Brown | ab1b18f | 2010-02-27 09:33:40 +1100 | [diff] [blame] | 975 | while ((dr = svc_deferred_dequeue(xprt)) != NULL) |
Tom Tucker | 22945e4 | 2009-01-05 15:21:19 -0600 | [diff] [blame] | 976 | kfree(dr); |
Tom Tucker | 22945e4 | 2009-01-05 15:21:19 -0600 | [diff] [blame] | 977 | |
J. Bruce Fields | edc7a89 | 2010-03-22 15:37:17 -0400 | [diff] [blame] | 978 | call_xpt_users(xprt); |
Tom Tucker | 22945e4 | 2009-01-05 15:21:19 -0600 | [diff] [blame] | 979 | svc_xprt_put(xprt); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 980 | } |
| 981 | |
| 982 | void svc_close_xprt(struct svc_xprt *xprt) |
| 983 | { |
| 984 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
| 985 | if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) |
| 986 | /* someone else will have to effect the close */ |
| 987 | return; |
J. Bruce Fields | b176331 | 2010-10-25 20:24:48 -0400 | [diff] [blame] | 988 | /* |
| 989 | * We expect svc_close_xprt() to work even when no threads are |
| 990 | * running (e.g., while configuring the server before starting |
| 991 | * any threads), so if the transport isn't busy, we delete |
| 992 | * it ourself: |
| 993 | */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 994 | svc_delete_xprt(xprt); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 995 | } |
Tom Tucker | a217813 | 2007-12-30 21:08:35 -0600 | [diff] [blame] | 996 | EXPORT_SYMBOL_GPL(svc_close_xprt); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 997 | |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 998 | static int svc_close_list(struct svc_serv *serv, struct list_head *xprt_list, struct net *net) |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 999 | { |
| 1000 | struct svc_xprt *xprt; |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 1001 | int ret = 0; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1002 | |
J. Bruce Fields | 719f8bc | 2012-08-13 17:03:00 -0400 | [diff] [blame] | 1003 | spin_lock(&serv->sv_lock); |
J. Bruce Fields | b4f36f8 | 2011-11-29 17:00:26 -0500 | [diff] [blame] | 1004 | list_for_each_entry(xprt, xprt_list, xpt_list) { |
Stanislav Kinsbursky | 7b147f1 | 2012-01-31 14:09:17 +0400 | [diff] [blame] | 1005 | if (xprt->xpt_net != net) |
| 1006 | continue; |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 1007 | ret++; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1008 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 1009 | svc_xprt_enqueue(xprt); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1010 | } |
J. Bruce Fields | 719f8bc | 2012-08-13 17:03:00 -0400 | [diff] [blame] | 1011 | spin_unlock(&serv->sv_lock); |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 1012 | return ret; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1013 | } |
| 1014 | |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 1015 | static struct svc_xprt *svc_dequeue_net(struct svc_serv *serv, struct net *net) |
J. Bruce Fields | 2fefb8a | 2011-11-29 11:35:35 -0500 | [diff] [blame] | 1016 | { |
J. Bruce Fields | b4f36f8 | 2011-11-29 17:00:26 -0500 | [diff] [blame] | 1017 | struct svc_pool *pool; |
| 1018 | struct svc_xprt *xprt; |
| 1019 | struct svc_xprt *tmp; |
| 1020 | int i; |
| 1021 | |
J. Bruce Fields | b4f36f8 | 2011-11-29 17:00:26 -0500 | [diff] [blame] | 1022 | for (i = 0; i < serv->sv_nrpools; i++) { |
| 1023 | pool = &serv->sv_pools[i]; |
| 1024 | |
| 1025 | spin_lock_bh(&pool->sp_lock); |
Stanislav Kinsbursky | 6f51336 | 2012-01-31 14:09:00 +0400 | [diff] [blame] | 1026 | list_for_each_entry_safe(xprt, tmp, &pool->sp_sockets, xpt_ready) { |
Stanislav Kinsbursky | 7b147f1 | 2012-01-31 14:09:17 +0400 | [diff] [blame] | 1027 | if (xprt->xpt_net != net) |
| 1028 | continue; |
J. Bruce Fields | b4f36f8 | 2011-11-29 17:00:26 -0500 | [diff] [blame] | 1029 | list_del_init(&xprt->xpt_ready); |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 1030 | spin_unlock_bh(&pool->sp_lock); |
| 1031 | return xprt; |
J. Bruce Fields | b4f36f8 | 2011-11-29 17:00:26 -0500 | [diff] [blame] | 1032 | } |
| 1033 | spin_unlock_bh(&pool->sp_lock); |
| 1034 | } |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 1035 | return NULL; |
Stanislav Kinsbursky | 6f51336 | 2012-01-31 14:09:00 +0400 | [diff] [blame] | 1036 | } |
| 1037 | |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 1038 | static void svc_clean_up_xprts(struct svc_serv *serv, struct net *net) |
Stanislav Kinsbursky | 6f51336 | 2012-01-31 14:09:00 +0400 | [diff] [blame] | 1039 | { |
| 1040 | struct svc_xprt *xprt; |
Stanislav Kinsbursky | 6f51336 | 2012-01-31 14:09:00 +0400 | [diff] [blame] | 1041 | |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 1042 | while ((xprt = svc_dequeue_net(serv, net))) { |
| 1043 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
J. Bruce Fields | 719f8bc | 2012-08-13 17:03:00 -0400 | [diff] [blame] | 1044 | svc_delete_xprt(xprt); |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 1045 | } |
Stanislav Kinsbursky | 3a22bf5 | 2012-01-31 14:09:08 +0400 | [diff] [blame] | 1046 | } |
| 1047 | |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 1048 | /* |
| 1049 | * Server threads may still be running (especially in the case where the |
| 1050 | * service is still running in other network namespaces). |
| 1051 | * |
| 1052 | * So we shut down sockets the same way we would on a running server, by |
| 1053 | * setting XPT_CLOSE, enqueuing, and letting a thread pick it up to do |
| 1054 | * the close. In the case there are no such other threads, |
| 1055 | * threads running, svc_clean_up_xprts() does a simple version of a |
| 1056 | * server's main event loop, and in the case where there are other |
| 1057 | * threads, we may need to wait a little while and then check again to |
| 1058 | * see if they're done. |
| 1059 | */ |
Stanislav Kinsbursky | 7b147f1 | 2012-01-31 14:09:17 +0400 | [diff] [blame] | 1060 | void svc_close_net(struct svc_serv *serv, struct net *net) |
Stanislav Kinsbursky | 3a22bf5 | 2012-01-31 14:09:08 +0400 | [diff] [blame] | 1061 | { |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 1062 | int delay = 0; |
Stanislav Kinsbursky | 6f51336 | 2012-01-31 14:09:00 +0400 | [diff] [blame] | 1063 | |
J. Bruce Fields | cc630d9 | 2013-02-10 16:08:11 -0500 | [diff] [blame] | 1064 | while (svc_close_list(serv, &serv->sv_permsocks, net) + |
| 1065 | svc_close_list(serv, &serv->sv_tempsocks, net)) { |
| 1066 | |
| 1067 | svc_clean_up_xprts(serv, net); |
| 1068 | msleep(delay++); |
| 1069 | } |
J. Bruce Fields | 2fefb8a | 2011-11-29 11:35:35 -0500 | [diff] [blame] | 1070 | } |
| 1071 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1072 | /* |
| 1073 | * Handle defer and revisit of requests |
| 1074 | */ |
| 1075 | |
| 1076 | static void svc_revisit(struct cache_deferred_req *dreq, int too_many) |
| 1077 | { |
| 1078 | struct svc_deferred_req *dr = |
| 1079 | container_of(dreq, struct svc_deferred_req, handle); |
| 1080 | struct svc_xprt *xprt = dr->xprt; |
| 1081 | |
Tom Tucker | 22945e4 | 2009-01-05 15:21:19 -0600 | [diff] [blame] | 1082 | spin_lock(&xprt->xpt_lock); |
| 1083 | set_bit(XPT_DEFERRED, &xprt->xpt_flags); |
| 1084 | if (too_many || test_bit(XPT_DEAD, &xprt->xpt_flags)) { |
| 1085 | spin_unlock(&xprt->xpt_lock); |
| 1086 | dprintk("revisit canceled\n"); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1087 | svc_xprt_put(xprt); |
| 1088 | kfree(dr); |
| 1089 | return; |
| 1090 | } |
| 1091 | dprintk("revisit queued\n"); |
| 1092 | dr->xprt = NULL; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1093 | list_add(&dr->handle.recent, &xprt->xpt_deferred); |
| 1094 | spin_unlock(&xprt->xpt_lock); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1095 | svc_xprt_enqueue(xprt); |
| 1096 | svc_xprt_put(xprt); |
| 1097 | } |
| 1098 | |
Tom Tucker | 260c1d1 | 2007-12-30 21:08:29 -0600 | [diff] [blame] | 1099 | /* |
| 1100 | * Save the request off for later processing. The request buffer looks |
| 1101 | * like this: |
| 1102 | * |
| 1103 | * <xprt-header><rpc-header><rpc-pagelist><rpc-tail> |
| 1104 | * |
| 1105 | * This code can only handle requests that consist of an xprt-header |
| 1106 | * and rpc-header. |
| 1107 | */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1108 | static struct cache_deferred_req *svc_defer(struct cache_req *req) |
| 1109 | { |
| 1110 | struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1111 | struct svc_deferred_req *dr; |
| 1112 | |
Jeff Layton | 30660e04b | 2014-11-19 07:51:16 -0500 | [diff] [blame] | 1113 | if (rqstp->rq_arg.page_len || !test_bit(RQ_USEDEFERRAL, &rqstp->rq_flags)) |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1114 | return NULL; /* if more than a page, give up FIXME */ |
| 1115 | if (rqstp->rq_deferred) { |
| 1116 | dr = rqstp->rq_deferred; |
| 1117 | rqstp->rq_deferred = NULL; |
| 1118 | } else { |
Tom Tucker | 260c1d1 | 2007-12-30 21:08:29 -0600 | [diff] [blame] | 1119 | size_t skip; |
| 1120 | size_t size; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1121 | /* FIXME maybe discard if size too large */ |
Tom Tucker | 260c1d1 | 2007-12-30 21:08:29 -0600 | [diff] [blame] | 1122 | size = sizeof(struct svc_deferred_req) + rqstp->rq_arg.len; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1123 | dr = kmalloc(size, GFP_KERNEL); |
| 1124 | if (dr == NULL) |
| 1125 | return NULL; |
| 1126 | |
| 1127 | dr->handle.owner = rqstp->rq_server; |
| 1128 | dr->prot = rqstp->rq_prot; |
| 1129 | memcpy(&dr->addr, &rqstp->rq_addr, rqstp->rq_addrlen); |
| 1130 | dr->addrlen = rqstp->rq_addrlen; |
| 1131 | dr->daddr = rqstp->rq_daddr; |
| 1132 | dr->argslen = rqstp->rq_arg.len >> 2; |
Tom Tucker | 260c1d1 | 2007-12-30 21:08:29 -0600 | [diff] [blame] | 1133 | dr->xprt_hlen = rqstp->rq_xprt_hlen; |
| 1134 | |
| 1135 | /* back up head to the start of the buffer and copy */ |
| 1136 | skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; |
| 1137 | memcpy(dr->args, rqstp->rq_arg.head[0].iov_base - skip, |
| 1138 | dr->argslen << 2); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1139 | } |
| 1140 | svc_xprt_get(rqstp->rq_xprt); |
| 1141 | dr->xprt = rqstp->rq_xprt; |
Jeff Layton | 78b65eb | 2014-11-19 07:51:17 -0500 | [diff] [blame] | 1142 | set_bit(RQ_DROPME, &rqstp->rq_flags); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1143 | |
| 1144 | dr->handle.revisit = svc_revisit; |
| 1145 | return &dr->handle; |
| 1146 | } |
| 1147 | |
| 1148 | /* |
| 1149 | * recv data from a deferred request into an active one |
| 1150 | */ |
| 1151 | static int svc_deferred_recv(struct svc_rqst *rqstp) |
| 1152 | { |
| 1153 | struct svc_deferred_req *dr = rqstp->rq_deferred; |
| 1154 | |
Tom Tucker | 260c1d1 | 2007-12-30 21:08:29 -0600 | [diff] [blame] | 1155 | /* setup iov_base past transport header */ |
| 1156 | rqstp->rq_arg.head[0].iov_base = dr->args + (dr->xprt_hlen>>2); |
| 1157 | /* The iov_len does not include the transport header bytes */ |
| 1158 | rqstp->rq_arg.head[0].iov_len = (dr->argslen<<2) - dr->xprt_hlen; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1159 | rqstp->rq_arg.page_len = 0; |
Tom Tucker | 260c1d1 | 2007-12-30 21:08:29 -0600 | [diff] [blame] | 1160 | /* The rq_arg.len includes the transport header bytes */ |
| 1161 | rqstp->rq_arg.len = dr->argslen<<2; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1162 | rqstp->rq_prot = dr->prot; |
| 1163 | memcpy(&rqstp->rq_addr, &dr->addr, dr->addrlen); |
| 1164 | rqstp->rq_addrlen = dr->addrlen; |
Tom Tucker | 260c1d1 | 2007-12-30 21:08:29 -0600 | [diff] [blame] | 1165 | /* Save off transport header len in case we get deferred again */ |
| 1166 | rqstp->rq_xprt_hlen = dr->xprt_hlen; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1167 | rqstp->rq_daddr = dr->daddr; |
| 1168 | rqstp->rq_respages = rqstp->rq_pages; |
Tom Tucker | 260c1d1 | 2007-12-30 21:08:29 -0600 | [diff] [blame] | 1169 | return (dr->argslen<<2) - dr->xprt_hlen; |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1170 | } |
| 1171 | |
| 1172 | |
| 1173 | static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt) |
| 1174 | { |
| 1175 | struct svc_deferred_req *dr = NULL; |
| 1176 | |
| 1177 | if (!test_bit(XPT_DEFERRED, &xprt->xpt_flags)) |
| 1178 | return NULL; |
| 1179 | spin_lock(&xprt->xpt_lock); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1180 | if (!list_empty(&xprt->xpt_deferred)) { |
| 1181 | dr = list_entry(xprt->xpt_deferred.next, |
| 1182 | struct svc_deferred_req, |
| 1183 | handle.recent); |
| 1184 | list_del_init(&dr->handle.recent); |
J. Bruce Fields | 62bac4a | 2010-10-25 12:50:15 -0400 | [diff] [blame] | 1185 | } else |
| 1186 | clear_bit(XPT_DEFERRED, &xprt->xpt_flags); |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1187 | spin_unlock(&xprt->xpt_lock); |
| 1188 | return dr; |
| 1189 | } |
Tom Tucker | 7fcb98d | 2007-12-30 21:08:33 -0600 | [diff] [blame] | 1190 | |
Chuck Lever | 156e620 | 2009-03-18 20:45:58 -0400 | [diff] [blame] | 1191 | /** |
| 1192 | * svc_find_xprt - find an RPC transport instance |
| 1193 | * @serv: pointer to svc_serv to search |
| 1194 | * @xcl_name: C string containing transport's class name |
Stanislav Kinsbursky | 4cb54ca | 2012-01-20 16:50:53 +0400 | [diff] [blame] | 1195 | * @net: owner net pointer |
Chuck Lever | 156e620 | 2009-03-18 20:45:58 -0400 | [diff] [blame] | 1196 | * @af: Address family of transport's local address |
| 1197 | * @port: transport's IP port number |
| 1198 | * |
Tom Tucker | 7fcb98d | 2007-12-30 21:08:33 -0600 | [diff] [blame] | 1199 | * Return the transport instance pointer for the endpoint accepting |
| 1200 | * connections/peer traffic from the specified transport class, |
| 1201 | * address family and port. |
| 1202 | * |
| 1203 | * Specifying 0 for the address family or port is effectively a |
| 1204 | * wild-card, and will result in matching the first transport in the |
| 1205 | * service's list that has a matching class name. |
| 1206 | */ |
Chuck Lever | 156e620 | 2009-03-18 20:45:58 -0400 | [diff] [blame] | 1207 | struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name, |
Stanislav Kinsbursky | 4cb54ca | 2012-01-20 16:50:53 +0400 | [diff] [blame] | 1208 | struct net *net, const sa_family_t af, |
| 1209 | const unsigned short port) |
Tom Tucker | 7fcb98d | 2007-12-30 21:08:33 -0600 | [diff] [blame] | 1210 | { |
| 1211 | struct svc_xprt *xprt; |
| 1212 | struct svc_xprt *found = NULL; |
| 1213 | |
| 1214 | /* Sanity check the args */ |
Chuck Lever | 156e620 | 2009-03-18 20:45:58 -0400 | [diff] [blame] | 1215 | if (serv == NULL || xcl_name == NULL) |
Tom Tucker | 7fcb98d | 2007-12-30 21:08:33 -0600 | [diff] [blame] | 1216 | return found; |
| 1217 | |
| 1218 | spin_lock_bh(&serv->sv_lock); |
| 1219 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { |
Stanislav Kinsbursky | 4cb54ca | 2012-01-20 16:50:53 +0400 | [diff] [blame] | 1220 | if (xprt->xpt_net != net) |
| 1221 | continue; |
Tom Tucker | 7fcb98d | 2007-12-30 21:08:33 -0600 | [diff] [blame] | 1222 | if (strcmp(xprt->xpt_class->xcl_name, xcl_name)) |
| 1223 | continue; |
| 1224 | if (af != AF_UNSPEC && af != xprt->xpt_local.ss_family) |
| 1225 | continue; |
Chuck Lever | 156e620 | 2009-03-18 20:45:58 -0400 | [diff] [blame] | 1226 | if (port != 0 && port != svc_xprt_local_port(xprt)) |
Tom Tucker | 7fcb98d | 2007-12-30 21:08:33 -0600 | [diff] [blame] | 1227 | continue; |
| 1228 | found = xprt; |
Tom Tucker | a217813 | 2007-12-30 21:08:35 -0600 | [diff] [blame] | 1229 | svc_xprt_get(xprt); |
Tom Tucker | 7fcb98d | 2007-12-30 21:08:33 -0600 | [diff] [blame] | 1230 | break; |
| 1231 | } |
| 1232 | spin_unlock_bh(&serv->sv_lock); |
| 1233 | return found; |
| 1234 | } |
| 1235 | EXPORT_SYMBOL_GPL(svc_find_xprt); |
Tom Tucker | 9571af1 | 2007-12-30 21:08:37 -0600 | [diff] [blame] | 1236 | |
Chuck Lever | 335c54b | 2009-04-23 19:32:25 -0400 | [diff] [blame] | 1237 | static int svc_one_xprt_name(const struct svc_xprt *xprt, |
| 1238 | char *pos, int remaining) |
| 1239 | { |
| 1240 | int len; |
| 1241 | |
| 1242 | len = snprintf(pos, remaining, "%s %u\n", |
| 1243 | xprt->xpt_class->xcl_name, |
| 1244 | svc_xprt_local_port(xprt)); |
| 1245 | if (len >= remaining) |
| 1246 | return -ENAMETOOLONG; |
| 1247 | return len; |
| 1248 | } |
| 1249 | |
| 1250 | /** |
| 1251 | * svc_xprt_names - format a buffer with a list of transport names |
| 1252 | * @serv: pointer to an RPC service |
| 1253 | * @buf: pointer to a buffer to be filled in |
| 1254 | * @buflen: length of buffer to be filled in |
| 1255 | * |
| 1256 | * Fills in @buf with a string containing a list of transport names, |
| 1257 | * each name terminated with '\n'. |
| 1258 | * |
| 1259 | * Returns positive length of the filled-in string on success; otherwise |
| 1260 | * a negative errno value is returned if an error occurs. |
Tom Tucker | 9571af1 | 2007-12-30 21:08:37 -0600 | [diff] [blame] | 1261 | */ |
Chuck Lever | 335c54b | 2009-04-23 19:32:25 -0400 | [diff] [blame] | 1262 | int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen) |
Tom Tucker | 9571af1 | 2007-12-30 21:08:37 -0600 | [diff] [blame] | 1263 | { |
| 1264 | struct svc_xprt *xprt; |
Chuck Lever | 335c54b | 2009-04-23 19:32:25 -0400 | [diff] [blame] | 1265 | int len, totlen; |
| 1266 | char *pos; |
Tom Tucker | 9571af1 | 2007-12-30 21:08:37 -0600 | [diff] [blame] | 1267 | |
| 1268 | /* Sanity check args */ |
| 1269 | if (!serv) |
| 1270 | return 0; |
| 1271 | |
| 1272 | spin_lock_bh(&serv->sv_lock); |
Chuck Lever | 335c54b | 2009-04-23 19:32:25 -0400 | [diff] [blame] | 1273 | |
| 1274 | pos = buf; |
| 1275 | totlen = 0; |
Tom Tucker | 9571af1 | 2007-12-30 21:08:37 -0600 | [diff] [blame] | 1276 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { |
Chuck Lever | 335c54b | 2009-04-23 19:32:25 -0400 | [diff] [blame] | 1277 | len = svc_one_xprt_name(xprt, pos, buflen - totlen); |
| 1278 | if (len < 0) { |
| 1279 | *buf = '\0'; |
| 1280 | totlen = len; |
| 1281 | } |
| 1282 | if (len <= 0) |
Tom Tucker | 9571af1 | 2007-12-30 21:08:37 -0600 | [diff] [blame] | 1283 | break; |
Chuck Lever | 335c54b | 2009-04-23 19:32:25 -0400 | [diff] [blame] | 1284 | |
| 1285 | pos += len; |
Tom Tucker | 9571af1 | 2007-12-30 21:08:37 -0600 | [diff] [blame] | 1286 | totlen += len; |
| 1287 | } |
Chuck Lever | 335c54b | 2009-04-23 19:32:25 -0400 | [diff] [blame] | 1288 | |
Tom Tucker | 9571af1 | 2007-12-30 21:08:37 -0600 | [diff] [blame] | 1289 | spin_unlock_bh(&serv->sv_lock); |
| 1290 | return totlen; |
| 1291 | } |
| 1292 | EXPORT_SYMBOL_GPL(svc_xprt_names); |
Greg Banks | 03cf6c9 | 2009-01-13 21:26:36 +1100 | [diff] [blame] | 1293 | |
| 1294 | |
| 1295 | /*----------------------------------------------------------------------------*/ |
| 1296 | |
| 1297 | static void *svc_pool_stats_start(struct seq_file *m, loff_t *pos) |
| 1298 | { |
| 1299 | unsigned int pidx = (unsigned int)*pos; |
| 1300 | struct svc_serv *serv = m->private; |
| 1301 | |
| 1302 | dprintk("svc_pool_stats_start, *pidx=%u\n", pidx); |
| 1303 | |
Greg Banks | 03cf6c9 | 2009-01-13 21:26:36 +1100 | [diff] [blame] | 1304 | if (!pidx) |
| 1305 | return SEQ_START_TOKEN; |
| 1306 | return (pidx > serv->sv_nrpools ? NULL : &serv->sv_pools[pidx-1]); |
| 1307 | } |
| 1308 | |
| 1309 | static void *svc_pool_stats_next(struct seq_file *m, void *p, loff_t *pos) |
| 1310 | { |
| 1311 | struct svc_pool *pool = p; |
| 1312 | struct svc_serv *serv = m->private; |
| 1313 | |
| 1314 | dprintk("svc_pool_stats_next, *pos=%llu\n", *pos); |
| 1315 | |
| 1316 | if (p == SEQ_START_TOKEN) { |
| 1317 | pool = &serv->sv_pools[0]; |
| 1318 | } else { |
| 1319 | unsigned int pidx = (pool - &serv->sv_pools[0]); |
| 1320 | if (pidx < serv->sv_nrpools-1) |
| 1321 | pool = &serv->sv_pools[pidx+1]; |
| 1322 | else |
| 1323 | pool = NULL; |
| 1324 | } |
| 1325 | ++*pos; |
| 1326 | return pool; |
| 1327 | } |
| 1328 | |
| 1329 | static void svc_pool_stats_stop(struct seq_file *m, void *p) |
| 1330 | { |
Greg Banks | 03cf6c9 | 2009-01-13 21:26:36 +1100 | [diff] [blame] | 1331 | } |
| 1332 | |
| 1333 | static int svc_pool_stats_show(struct seq_file *m, void *p) |
| 1334 | { |
| 1335 | struct svc_pool *pool = p; |
| 1336 | |
| 1337 | if (p == SEQ_START_TOKEN) { |
J. Bruce Fields | 78c210e | 2009-08-06 15:41:34 -0400 | [diff] [blame] | 1338 | seq_puts(m, "# pool packets-arrived sockets-enqueued threads-woken threads-timedout\n"); |
Greg Banks | 03cf6c9 | 2009-01-13 21:26:36 +1100 | [diff] [blame] | 1339 | return 0; |
| 1340 | } |
| 1341 | |
J. Bruce Fields | 78c210e | 2009-08-06 15:41:34 -0400 | [diff] [blame] | 1342 | seq_printf(m, "%u %lu %lu %lu %lu\n", |
Greg Banks | 03cf6c9 | 2009-01-13 21:26:36 +1100 | [diff] [blame] | 1343 | pool->sp_id, |
Jeff Layton | 403c7b4 | 2014-11-21 14:19:29 -0500 | [diff] [blame] | 1344 | (unsigned long)atomic_long_read(&pool->sp_stats.packets), |
Greg Banks | 03cf6c9 | 2009-01-13 21:26:36 +1100 | [diff] [blame] | 1345 | pool->sp_stats.sockets_queued, |
Jeff Layton | 403c7b4 | 2014-11-21 14:19:29 -0500 | [diff] [blame] | 1346 | (unsigned long)atomic_long_read(&pool->sp_stats.threads_woken), |
| 1347 | (unsigned long)atomic_long_read(&pool->sp_stats.threads_timedout)); |
Greg Banks | 03cf6c9 | 2009-01-13 21:26:36 +1100 | [diff] [blame] | 1348 | |
| 1349 | return 0; |
| 1350 | } |
| 1351 | |
| 1352 | static const struct seq_operations svc_pool_stats_seq_ops = { |
| 1353 | .start = svc_pool_stats_start, |
| 1354 | .next = svc_pool_stats_next, |
| 1355 | .stop = svc_pool_stats_stop, |
| 1356 | .show = svc_pool_stats_show, |
| 1357 | }; |
| 1358 | |
| 1359 | int svc_pool_stats_open(struct svc_serv *serv, struct file *file) |
| 1360 | { |
| 1361 | int err; |
| 1362 | |
| 1363 | err = seq_open(file, &svc_pool_stats_seq_ops); |
| 1364 | if (!err) |
| 1365 | ((struct seq_file *) file->private_data)->private = serv; |
| 1366 | return err; |
| 1367 | } |
| 1368 | EXPORT_SYMBOL(svc_pool_stats_open); |
| 1369 | |
| 1370 | /*----------------------------------------------------------------------------*/ |