Commit | Line | Data |
---|---|---|
1d8206b9 TT |
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> | |
1d8206b9 | 9 | #include <linux/freezer.h> |
7086721f | 10 | #include <linux/kthread.h> |
5a0e3ad6 | 11 | #include <linux/slab.h> |
1d8206b9 | 12 | #include <net/sock.h> |
1d8206b9 TT |
13 | #include <linux/sunrpc/stats.h> |
14 | #include <linux/sunrpc/svc_xprt.h> | |
dcf1a357 | 15 | #include <linux/sunrpc/svcsock.h> |
99de8ea9 | 16 | #include <linux/sunrpc/xprt.h> |
3a9a231d | 17 | #include <linux/module.h> |
1d8206b9 TT |
18 | |
19 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT | |
20 | ||
0f0257ea TT |
21 | static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt); |
22 | static int svc_deferred_recv(struct svc_rqst *rqstp); | |
23 | static struct cache_deferred_req *svc_defer(struct cache_req *req); | |
24 | static void svc_age_temp_xprts(unsigned long closure); | |
7710ec36 | 25 | static void svc_delete_xprt(struct svc_xprt *xprt); |
0f0257ea TT |
26 | |
27 | /* apparently the "standard" is that clients close | |
28 | * idle connections after 5 minutes, servers after | |
29 | * 6 minutes | |
30 | * http://www.connectathon.org/talks96/nfstcp.pdf | |
31 | */ | |
32 | static int svc_conn_age_period = 6*60; | |
33 | ||
1d8206b9 TT |
34 | /* List of registered transport classes */ |
35 | static DEFINE_SPINLOCK(svc_xprt_class_lock); | |
36 | static LIST_HEAD(svc_xprt_class_list); | |
37 | ||
0f0257ea TT |
38 | /* SMP locking strategy: |
39 | * | |
40 | * svc_pool->sp_lock protects most of the fields of that pool. | |
41 | * svc_serv->sv_lock protects sv_tempsocks, sv_permsocks, sv_tmpcnt. | |
42 | * when both need to be taken (rare), svc_serv->sv_lock is first. | |
43 | * BKL protects svc_serv->sv_nrthread. | |
44 | * svc_sock->sk_lock protects the svc_sock->sk_deferred list | |
45 | * and the ->sk_info_authunix cache. | |
46 | * | |
47 | * The XPT_BUSY bit in xprt->xpt_flags prevents a transport being | |
48 | * enqueued multiply. During normal transport processing this bit | |
49 | * is set by svc_xprt_enqueue and cleared by svc_xprt_received. | |
50 | * Providers should not manipulate this bit directly. | |
51 | * | |
52 | * Some flags can be set to certain values at any time | |
53 | * providing that certain rules are followed: | |
54 | * | |
55 | * XPT_CONN, XPT_DATA: | |
56 | * - Can be set or cleared at any time. | |
57 | * - After a set, svc_xprt_enqueue must be called to enqueue | |
58 | * the transport for processing. | |
59 | * - After a clear, the transport must be read/accepted. | |
60 | * If this succeeds, it must be set again. | |
61 | * XPT_CLOSE: | |
62 | * - Can set at any time. It is never cleared. | |
63 | * XPT_DEAD: | |
64 | * - Can only be set while XPT_BUSY is held which ensures | |
65 | * that no other thread will be using the transport or will | |
66 | * try to set XPT_DEAD. | |
67 | */ | |
68 | ||
1d8206b9 TT |
69 | int svc_reg_xprt_class(struct svc_xprt_class *xcl) |
70 | { | |
71 | struct svc_xprt_class *cl; | |
72 | int res = -EEXIST; | |
73 | ||
74 | dprintk("svc: Adding svc transport class '%s'\n", xcl->xcl_name); | |
75 | ||
76 | INIT_LIST_HEAD(&xcl->xcl_list); | |
77 | spin_lock(&svc_xprt_class_lock); | |
78 | /* Make sure there isn't already a class with the same name */ | |
79 | list_for_each_entry(cl, &svc_xprt_class_list, xcl_list) { | |
80 | if (strcmp(xcl->xcl_name, cl->xcl_name) == 0) | |
81 | goto out; | |
82 | } | |
83 | list_add_tail(&xcl->xcl_list, &svc_xprt_class_list); | |
84 | res = 0; | |
85 | out: | |
86 | spin_unlock(&svc_xprt_class_lock); | |
87 | return res; | |
88 | } | |
89 | EXPORT_SYMBOL_GPL(svc_reg_xprt_class); | |
90 | ||
91 | void svc_unreg_xprt_class(struct svc_xprt_class *xcl) | |
92 | { | |
93 | dprintk("svc: Removing svc transport class '%s'\n", xcl->xcl_name); | |
94 | spin_lock(&svc_xprt_class_lock); | |
95 | list_del_init(&xcl->xcl_list); | |
96 | spin_unlock(&svc_xprt_class_lock); | |
97 | } | |
98 | EXPORT_SYMBOL_GPL(svc_unreg_xprt_class); | |
99 | ||
dc9a16e4 TT |
100 | /* |
101 | * Format the transport list for printing | |
102 | */ | |
103 | int svc_print_xprts(char *buf, int maxlen) | |
104 | { | |
8f3a6de3 | 105 | struct svc_xprt_class *xcl; |
dc9a16e4 TT |
106 | char tmpstr[80]; |
107 | int len = 0; | |
108 | buf[0] = '\0'; | |
109 | ||
110 | spin_lock(&svc_xprt_class_lock); | |
8f3a6de3 | 111 | list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) { |
dc9a16e4 | 112 | int slen; |
dc9a16e4 TT |
113 | |
114 | sprintf(tmpstr, "%s %d\n", xcl->xcl_name, xcl->xcl_max_payload); | |
115 | slen = strlen(tmpstr); | |
116 | if (len + slen > maxlen) | |
117 | break; | |
118 | len += slen; | |
119 | strcat(buf, tmpstr); | |
120 | } | |
121 | spin_unlock(&svc_xprt_class_lock); | |
122 | ||
123 | return len; | |
124 | } | |
125 | ||
e1b3157f TT |
126 | static void svc_xprt_free(struct kref *kref) |
127 | { | |
128 | struct svc_xprt *xprt = | |
129 | container_of(kref, struct svc_xprt, xpt_ref); | |
130 | struct module *owner = xprt->xpt_class->xcl_owner; | |
e3bfca01 PE |
131 | if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) |
132 | svcauth_unix_info_release(xprt); | |
4fb8518b | 133 | put_net(xprt->xpt_net); |
99de8ea9 BF |
134 | /* See comment on corresponding get in xs_setup_bc_tcp(): */ |
135 | if (xprt->xpt_bc_xprt) | |
136 | xprt_put(xprt->xpt_bc_xprt); | |
e1b3157f TT |
137 | xprt->xpt_ops->xpo_free(xprt); |
138 | module_put(owner); | |
139 | } | |
140 | ||
141 | void svc_xprt_put(struct svc_xprt *xprt) | |
142 | { | |
143 | kref_put(&xprt->xpt_ref, svc_xprt_free); | |
144 | } | |
145 | EXPORT_SYMBOL_GPL(svc_xprt_put); | |
146 | ||
1d8206b9 TT |
147 | /* |
148 | * Called by transport drivers to initialize the transport independent | |
149 | * portion of the transport instance. | |
150 | */ | |
bd4620dd SK |
151 | void svc_xprt_init(struct net *net, struct svc_xprt_class *xcl, |
152 | struct svc_xprt *xprt, struct svc_serv *serv) | |
1d8206b9 TT |
153 | { |
154 | memset(xprt, 0, sizeof(*xprt)); | |
155 | xprt->xpt_class = xcl; | |
156 | xprt->xpt_ops = xcl->xcl_ops; | |
e1b3157f | 157 | kref_init(&xprt->xpt_ref); |
bb5cf160 | 158 | xprt->xpt_server = serv; |
7a182083 TT |
159 | INIT_LIST_HEAD(&xprt->xpt_list); |
160 | INIT_LIST_HEAD(&xprt->xpt_ready); | |
8c7b0172 | 161 | INIT_LIST_HEAD(&xprt->xpt_deferred); |
edc7a894 | 162 | INIT_LIST_HEAD(&xprt->xpt_users); |
a50fea26 | 163 | mutex_init(&xprt->xpt_mutex); |
def13d74 | 164 | spin_lock_init(&xprt->xpt_lock); |
4e5caaa5 | 165 | set_bit(XPT_BUSY, &xprt->xpt_flags); |
4cfc7e60 | 166 | rpc_init_wait_queue(&xprt->xpt_bc_pending, "xpt_bc_pending"); |
bd4620dd | 167 | xprt->xpt_net = get_net(net); |
1d8206b9 TT |
168 | } |
169 | EXPORT_SYMBOL_GPL(svc_xprt_init); | |
b700cbb1 | 170 | |
5dd248f6 CL |
171 | static struct svc_xprt *__svc_xpo_create(struct svc_xprt_class *xcl, |
172 | struct svc_serv *serv, | |
62832c03 | 173 | struct net *net, |
9652ada3 CL |
174 | const int family, |
175 | const unsigned short port, | |
176 | int flags) | |
b700cbb1 | 177 | { |
b700cbb1 TT |
178 | struct sockaddr_in sin = { |
179 | .sin_family = AF_INET, | |
e6f1cebf | 180 | .sin_addr.s_addr = htonl(INADDR_ANY), |
b700cbb1 TT |
181 | .sin_port = htons(port), |
182 | }; | |
dfd56b8b | 183 | #if IS_ENABLED(CONFIG_IPV6) |
5dd248f6 CL |
184 | struct sockaddr_in6 sin6 = { |
185 | .sin6_family = AF_INET6, | |
186 | .sin6_addr = IN6ADDR_ANY_INIT, | |
187 | .sin6_port = htons(port), | |
188 | }; | |
dfd56b8b | 189 | #endif |
5dd248f6 CL |
190 | struct sockaddr *sap; |
191 | size_t len; | |
192 | ||
9652ada3 CL |
193 | switch (family) { |
194 | case PF_INET: | |
5dd248f6 CL |
195 | sap = (struct sockaddr *)&sin; |
196 | len = sizeof(sin); | |
197 | break; | |
dfd56b8b | 198 | #if IS_ENABLED(CONFIG_IPV6) |
9652ada3 | 199 | case PF_INET6: |
5dd248f6 CL |
200 | sap = (struct sockaddr *)&sin6; |
201 | len = sizeof(sin6); | |
202 | break; | |
dfd56b8b | 203 | #endif |
5dd248f6 CL |
204 | default: |
205 | return ERR_PTR(-EAFNOSUPPORT); | |
206 | } | |
207 | ||
62832c03 | 208 | return xcl->xcl_ops->xpo_create(serv, net, sap, len, flags); |
5dd248f6 CL |
209 | } |
210 | ||
9652ada3 | 211 | int svc_create_xprt(struct svc_serv *serv, const char *xprt_name, |
fc5d00b0 PE |
212 | struct net *net, const int family, |
213 | const unsigned short port, int flags) | |
5dd248f6 CL |
214 | { |
215 | struct svc_xprt_class *xcl; | |
216 | ||
b700cbb1 TT |
217 | dprintk("svc: creating transport %s[%d]\n", xprt_name, port); |
218 | spin_lock(&svc_xprt_class_lock); | |
219 | list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) { | |
4e5caaa5 | 220 | struct svc_xprt *newxprt; |
ed2849d3 | 221 | unsigned short newport; |
4e5caaa5 TT |
222 | |
223 | if (strcmp(xprt_name, xcl->xcl_name)) | |
224 | continue; | |
225 | ||
226 | if (!try_module_get(xcl->xcl_owner)) | |
227 | goto err; | |
228 | ||
229 | spin_unlock(&svc_xprt_class_lock); | |
62832c03 | 230 | newxprt = __svc_xpo_create(xcl, serv, net, family, port, flags); |
4e5caaa5 TT |
231 | if (IS_ERR(newxprt)) { |
232 | module_put(xcl->xcl_owner); | |
233 | return PTR_ERR(newxprt); | |
b700cbb1 | 234 | } |
4e5caaa5 TT |
235 | |
236 | clear_bit(XPT_TEMP, &newxprt->xpt_flags); | |
237 | spin_lock_bh(&serv->sv_lock); | |
238 | list_add(&newxprt->xpt_list, &serv->sv_permsocks); | |
239 | spin_unlock_bh(&serv->sv_lock); | |
ed2849d3 | 240 | newport = svc_xprt_local_port(newxprt); |
4e5caaa5 | 241 | clear_bit(XPT_BUSY, &newxprt->xpt_flags); |
ed2849d3 | 242 | return newport; |
b700cbb1 | 243 | } |
4e5caaa5 | 244 | err: |
b700cbb1 TT |
245 | spin_unlock(&svc_xprt_class_lock); |
246 | dprintk("svc: transport %s not found\n", xprt_name); | |
68717908 CL |
247 | |
248 | /* This errno is exposed to user space. Provide a reasonable | |
249 | * perror msg for a bad transport. */ | |
250 | return -EPROTONOSUPPORT; | |
b700cbb1 TT |
251 | } |
252 | EXPORT_SYMBOL_GPL(svc_create_xprt); | |
9dbc240f TT |
253 | |
254 | /* | |
255 | * Copy the local and remote xprt addresses to the rqstp structure | |
256 | */ | |
257 | void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt) | |
258 | { | |
9dbc240f TT |
259 | memcpy(&rqstp->rq_addr, &xprt->xpt_remote, xprt->xpt_remotelen); |
260 | rqstp->rq_addrlen = xprt->xpt_remotelen; | |
261 | ||
262 | /* | |
263 | * Destination address in request is needed for binding the | |
264 | * source address in RPC replies/callbacks later. | |
265 | */ | |
849a1cf1 MJ |
266 | memcpy(&rqstp->rq_daddr, &xprt->xpt_local, xprt->xpt_locallen); |
267 | rqstp->rq_daddrlen = xprt->xpt_locallen; | |
9dbc240f TT |
268 | } |
269 | EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs); | |
270 | ||
0f0257ea TT |
271 | /** |
272 | * svc_print_addr - Format rq_addr field for printing | |
273 | * @rqstp: svc_rqst struct containing address to print | |
274 | * @buf: target buffer for formatted address | |
275 | * @len: length of target buffer | |
276 | * | |
277 | */ | |
278 | char *svc_print_addr(struct svc_rqst *rqstp, char *buf, size_t len) | |
279 | { | |
280 | return __svc_print_addr(svc_addr(rqstp), buf, len); | |
281 | } | |
282 | EXPORT_SYMBOL_GPL(svc_print_addr); | |
283 | ||
284 | /* | |
285 | * Queue up an idle server thread. Must have pool->sp_lock held. | |
286 | * Note: this is really a stack rather than a queue, so that we only | |
287 | * use as many different threads as we need, and the rest don't pollute | |
288 | * the cache. | |
289 | */ | |
290 | static void svc_thread_enqueue(struct svc_pool *pool, struct svc_rqst *rqstp) | |
291 | { | |
292 | list_add(&rqstp->rq_list, &pool->sp_threads); | |
293 | } | |
294 | ||
295 | /* | |
296 | * Dequeue an nfsd thread. Must have pool->sp_lock held. | |
297 | */ | |
298 | static void svc_thread_dequeue(struct svc_pool *pool, struct svc_rqst *rqstp) | |
299 | { | |
300 | list_del(&rqstp->rq_list); | |
301 | } | |
302 | ||
9c335c0b BF |
303 | static bool svc_xprt_has_something_to_do(struct svc_xprt *xprt) |
304 | { | |
305 | if (xprt->xpt_flags & ((1<<XPT_CONN)|(1<<XPT_CLOSE))) | |
306 | return true; | |
307 | if (xprt->xpt_flags & ((1<<XPT_DATA)|(1<<XPT_DEFERRED))) | |
308 | return xprt->xpt_ops->xpo_has_wspace(xprt); | |
309 | return false; | |
310 | } | |
311 | ||
0f0257ea TT |
312 | /* |
313 | * Queue up a transport with data pending. If there are idle nfsd | |
314 | * processes, wake 'em up. | |
315 | * | |
316 | */ | |
317 | void svc_xprt_enqueue(struct svc_xprt *xprt) | |
318 | { | |
0f0257ea TT |
319 | struct svc_pool *pool; |
320 | struct svc_rqst *rqstp; | |
321 | int cpu; | |
322 | ||
9c335c0b | 323 | if (!svc_xprt_has_something_to_do(xprt)) |
0f0257ea | 324 | return; |
0f0257ea TT |
325 | |
326 | cpu = get_cpu(); | |
327 | pool = svc_pool_for_cpu(xprt->xpt_server, cpu); | |
328 | put_cpu(); | |
329 | ||
330 | spin_lock_bh(&pool->sp_lock); | |
331 | ||
78c210ef BF |
332 | if (!list_empty(&pool->sp_threads) && |
333 | !list_empty(&pool->sp_sockets)) | |
334 | printk(KERN_ERR | |
335 | "svc_xprt_enqueue: " | |
336 | "threads and transports both waiting??\n"); | |
337 | ||
03cf6c9f GB |
338 | pool->sp_stats.packets++; |
339 | ||
0f0257ea TT |
340 | /* Mark transport as busy. It will remain in this state until |
341 | * the provider calls svc_xprt_received. We update XPT_BUSY | |
342 | * atomically because it also guards against trying to enqueue | |
343 | * the transport twice. | |
344 | */ | |
345 | if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) { | |
346 | /* Don't enqueue transport while already enqueued */ | |
347 | dprintk("svc: transport %p busy, not enqueued\n", xprt); | |
348 | goto out_unlock; | |
349 | } | |
0f0257ea | 350 | |
78c210ef | 351 | if (!list_empty(&pool->sp_threads)) { |
0f0257ea TT |
352 | rqstp = list_entry(pool->sp_threads.next, |
353 | struct svc_rqst, | |
354 | rq_list); | |
355 | dprintk("svc: transport %p served by daemon %p\n", | |
356 | xprt, rqstp); | |
357 | svc_thread_dequeue(pool, rqstp); | |
358 | if (rqstp->rq_xprt) | |
359 | printk(KERN_ERR | |
360 | "svc_xprt_enqueue: server %p, rq_xprt=%p!\n", | |
361 | rqstp, rqstp->rq_xprt); | |
362 | rqstp->rq_xprt = xprt; | |
363 | svc_xprt_get(xprt); | |
03cf6c9f | 364 | pool->sp_stats.threads_woken++; |
0f0257ea TT |
365 | wake_up(&rqstp->rq_wait); |
366 | } else { | |
367 | dprintk("svc: transport %p put into queue\n", xprt); | |
368 | list_add_tail(&xprt->xpt_ready, &pool->sp_sockets); | |
03cf6c9f | 369 | pool->sp_stats.sockets_queued++; |
0f0257ea TT |
370 | } |
371 | ||
372 | out_unlock: | |
373 | spin_unlock_bh(&pool->sp_lock); | |
374 | } | |
375 | EXPORT_SYMBOL_GPL(svc_xprt_enqueue); | |
376 | ||
377 | /* | |
378 | * Dequeue the first transport. Must be called with the pool->sp_lock held. | |
379 | */ | |
380 | static struct svc_xprt *svc_xprt_dequeue(struct svc_pool *pool) | |
381 | { | |
382 | struct svc_xprt *xprt; | |
383 | ||
384 | if (list_empty(&pool->sp_sockets)) | |
385 | return NULL; | |
386 | ||
387 | xprt = list_entry(pool->sp_sockets.next, | |
388 | struct svc_xprt, xpt_ready); | |
389 | list_del_init(&xprt->xpt_ready); | |
390 | ||
391 | dprintk("svc: transport %p dequeued, inuse=%d\n", | |
392 | xprt, atomic_read(&xprt->xpt_ref.refcount)); | |
393 | ||
394 | return xprt; | |
395 | } | |
396 | ||
397 | /* | |
398 | * svc_xprt_received conditionally queues the transport for processing | |
399 | * by another thread. The caller must hold the XPT_BUSY bit and must | |
400 | * not thereafter touch transport data. | |
401 | * | |
402 | * Note: XPT_DATA only gets cleared when a read-attempt finds no (or | |
403 | * insufficient) data. | |
404 | */ | |
405 | void svc_xprt_received(struct svc_xprt *xprt) | |
406 | { | |
407 | BUG_ON(!test_bit(XPT_BUSY, &xprt->xpt_flags)); | |
ed2849d3 N |
408 | /* As soon as we clear busy, the xprt could be closed and |
409 | * 'put', so we need a reference to call svc_xprt_enqueue with: | |
410 | */ | |
411 | svc_xprt_get(xprt); | |
0f0257ea TT |
412 | clear_bit(XPT_BUSY, &xprt->xpt_flags); |
413 | svc_xprt_enqueue(xprt); | |
ed2849d3 | 414 | svc_xprt_put(xprt); |
0f0257ea TT |
415 | } |
416 | EXPORT_SYMBOL_GPL(svc_xprt_received); | |
417 | ||
418 | /** | |
419 | * svc_reserve - change the space reserved for the reply to a request. | |
420 | * @rqstp: The request in question | |
421 | * @space: new max space to reserve | |
422 | * | |
423 | * Each request reserves some space on the output queue of the transport | |
424 | * to make sure the reply fits. This function reduces that reserved | |
425 | * space to be the amount of space used already, plus @space. | |
426 | * | |
427 | */ | |
428 | void svc_reserve(struct svc_rqst *rqstp, int space) | |
429 | { | |
430 | space += rqstp->rq_res.head[0].iov_len; | |
431 | ||
432 | if (space < rqstp->rq_reserved) { | |
433 | struct svc_xprt *xprt = rqstp->rq_xprt; | |
434 | atomic_sub((rqstp->rq_reserved - space), &xprt->xpt_reserved); | |
435 | rqstp->rq_reserved = space; | |
436 | ||
437 | svc_xprt_enqueue(xprt); | |
438 | } | |
439 | } | |
24c3767e | 440 | EXPORT_SYMBOL_GPL(svc_reserve); |
0f0257ea TT |
441 | |
442 | static void svc_xprt_release(struct svc_rqst *rqstp) | |
443 | { | |
444 | struct svc_xprt *xprt = rqstp->rq_xprt; | |
445 | ||
446 | rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); | |
447 | ||
2779e3ae TT |
448 | kfree(rqstp->rq_deferred); |
449 | rqstp->rq_deferred = NULL; | |
450 | ||
0f0257ea TT |
451 | svc_free_res_pages(rqstp); |
452 | rqstp->rq_res.page_len = 0; | |
453 | rqstp->rq_res.page_base = 0; | |
454 | ||
455 | /* Reset response buffer and release | |
456 | * the reservation. | |
457 | * But first, check that enough space was reserved | |
458 | * for the reply, otherwise we have a bug! | |
459 | */ | |
460 | if ((rqstp->rq_res.len) > rqstp->rq_reserved) | |
461 | printk(KERN_ERR "RPC request reserved %d but used %d\n", | |
462 | rqstp->rq_reserved, | |
463 | rqstp->rq_res.len); | |
464 | ||
465 | rqstp->rq_res.head[0].iov_len = 0; | |
466 | svc_reserve(rqstp, 0); | |
467 | rqstp->rq_xprt = NULL; | |
468 | ||
469 | svc_xprt_put(xprt); | |
470 | } | |
471 | ||
472 | /* | |
473 | * External function to wake up a server waiting for data | |
474 | * This really only makes sense for services like lockd | |
475 | * which have exactly one thread anyway. | |
476 | */ | |
477 | void svc_wake_up(struct svc_serv *serv) | |
478 | { | |
479 | struct svc_rqst *rqstp; | |
480 | unsigned int i; | |
481 | struct svc_pool *pool; | |
482 | ||
483 | for (i = 0; i < serv->sv_nrpools; i++) { | |
484 | pool = &serv->sv_pools[i]; | |
485 | ||
486 | spin_lock_bh(&pool->sp_lock); | |
487 | if (!list_empty(&pool->sp_threads)) { | |
488 | rqstp = list_entry(pool->sp_threads.next, | |
489 | struct svc_rqst, | |
490 | rq_list); | |
491 | dprintk("svc: daemon %p woken up.\n", rqstp); | |
492 | /* | |
493 | svc_thread_dequeue(pool, rqstp); | |
494 | rqstp->rq_xprt = NULL; | |
495 | */ | |
496 | wake_up(&rqstp->rq_wait); | |
497 | } | |
498 | spin_unlock_bh(&pool->sp_lock); | |
499 | } | |
500 | } | |
24c3767e | 501 | EXPORT_SYMBOL_GPL(svc_wake_up); |
0f0257ea TT |
502 | |
503 | int svc_port_is_privileged(struct sockaddr *sin) | |
504 | { | |
505 | switch (sin->sa_family) { | |
506 | case AF_INET: | |
507 | return ntohs(((struct sockaddr_in *)sin)->sin_port) | |
508 | < PROT_SOCK; | |
509 | case AF_INET6: | |
510 | return ntohs(((struct sockaddr_in6 *)sin)->sin6_port) | |
511 | < PROT_SOCK; | |
512 | default: | |
513 | return 0; | |
514 | } | |
515 | } | |
516 | ||
517 | /* | |
c9233eb7 JL |
518 | * Make sure that we don't have too many active connections. If we have, |
519 | * something must be dropped. It's not clear what will happen if we allow | |
520 | * "too many" connections, but when dealing with network-facing software, | |
521 | * we have to code defensively. Here we do that by imposing hard limits. | |
0f0257ea TT |
522 | * |
523 | * There's no point in trying to do random drop here for DoS | |
524 | * prevention. The NFS clients does 1 reconnect in 15 seconds. An | |
525 | * attacker can easily beat that. | |
526 | * | |
527 | * The only somewhat efficient mechanism would be if drop old | |
528 | * connections from the same IP first. But right now we don't even | |
529 | * record the client IP in svc_sock. | |
c9233eb7 JL |
530 | * |
531 | * single-threaded services that expect a lot of clients will probably | |
532 | * need to set sv_maxconn to override the default value which is based | |
533 | * on the number of threads | |
0f0257ea TT |
534 | */ |
535 | static void svc_check_conn_limits(struct svc_serv *serv) | |
536 | { | |
c9233eb7 JL |
537 | unsigned int limit = serv->sv_maxconn ? serv->sv_maxconn : |
538 | (serv->sv_nrthreads+3) * 20; | |
539 | ||
540 | if (serv->sv_tmpcnt > limit) { | |
0f0257ea TT |
541 | struct svc_xprt *xprt = NULL; |
542 | spin_lock_bh(&serv->sv_lock); | |
543 | if (!list_empty(&serv->sv_tempsocks)) { | |
e87cc472 JP |
544 | /* Try to help the admin */ |
545 | net_notice_ratelimited("%s: too many open connections, consider increasing the %s\n", | |
546 | serv->sv_name, serv->sv_maxconn ? | |
547 | "max number of connections" : | |
548 | "number of threads"); | |
0f0257ea TT |
549 | /* |
550 | * Always select the oldest connection. It's not fair, | |
551 | * but so is life | |
552 | */ | |
553 | xprt = list_entry(serv->sv_tempsocks.prev, | |
554 | struct svc_xprt, | |
555 | xpt_list); | |
556 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
557 | svc_xprt_get(xprt); | |
558 | } | |
559 | spin_unlock_bh(&serv->sv_lock); | |
560 | ||
561 | if (xprt) { | |
562 | svc_xprt_enqueue(xprt); | |
563 | svc_xprt_put(xprt); | |
564 | } | |
565 | } | |
566 | } | |
567 | ||
568 | /* | |
569 | * Receive the next request on any transport. This code is carefully | |
570 | * organised not to touch any cachelines in the shared svc_serv | |
571 | * structure, only cachelines in the local svc_pool. | |
572 | */ | |
573 | int svc_recv(struct svc_rqst *rqstp, long timeout) | |
574 | { | |
575 | struct svc_xprt *xprt = NULL; | |
576 | struct svc_serv *serv = rqstp->rq_server; | |
577 | struct svc_pool *pool = rqstp->rq_pool; | |
578 | int len, i; | |
579 | int pages; | |
580 | struct xdr_buf *arg; | |
581 | DECLARE_WAITQUEUE(wait, current); | |
03cf6c9f | 582 | long time_left; |
0f0257ea TT |
583 | |
584 | dprintk("svc: server %p waiting for data (to = %ld)\n", | |
585 | rqstp, timeout); | |
586 | ||
587 | if (rqstp->rq_xprt) | |
588 | printk(KERN_ERR | |
589 | "svc_recv: service %p, transport not NULL!\n", | |
590 | rqstp); | |
591 | if (waitqueue_active(&rqstp->rq_wait)) | |
592 | printk(KERN_ERR | |
593 | "svc_recv: service %p, wait queue active!\n", | |
594 | rqstp); | |
595 | ||
596 | /* now allocate needed pages. If we get a failure, sleep briefly */ | |
597 | pages = (serv->sv_max_mesg + PAGE_SIZE) / PAGE_SIZE; | |
91c427ac | 598 | BUG_ON(pages >= RPCSVC_MAXPAGES); |
0f0257ea TT |
599 | for (i = 0; i < pages ; i++) |
600 | while (rqstp->rq_pages[i] == NULL) { | |
601 | struct page *p = alloc_page(GFP_KERNEL); | |
602 | if (!p) { | |
7b54fe61 JL |
603 | set_current_state(TASK_INTERRUPTIBLE); |
604 | if (signalled() || kthread_should_stop()) { | |
605 | set_current_state(TASK_RUNNING); | |
7086721f | 606 | return -EINTR; |
7b54fe61 JL |
607 | } |
608 | schedule_timeout(msecs_to_jiffies(500)); | |
0f0257ea TT |
609 | } |
610 | rqstp->rq_pages[i] = p; | |
611 | } | |
612 | rqstp->rq_pages[i++] = NULL; /* this might be seen in nfs_read_actor */ | |
0f0257ea TT |
613 | |
614 | /* Make arg->head point to first page and arg->pages point to rest */ | |
615 | arg = &rqstp->rq_arg; | |
616 | arg->head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
617 | arg->head[0].iov_len = PAGE_SIZE; | |
618 | arg->pages = rqstp->rq_pages + 1; | |
619 | arg->page_base = 0; | |
620 | /* save at least one page for response */ | |
621 | arg->page_len = (pages-2)*PAGE_SIZE; | |
622 | arg->len = (pages-1)*PAGE_SIZE; | |
623 | arg->tail[0].iov_len = 0; | |
624 | ||
625 | try_to_freeze(); | |
626 | cond_resched(); | |
7086721f | 627 | if (signalled() || kthread_should_stop()) |
0f0257ea TT |
628 | return -EINTR; |
629 | ||
f16b6e8d N |
630 | /* Normally we will wait up to 5 seconds for any required |
631 | * cache information to be provided. | |
632 | */ | |
633 | rqstp->rq_chandle.thread_wait = 5*HZ; | |
634 | ||
0f0257ea TT |
635 | spin_lock_bh(&pool->sp_lock); |
636 | xprt = svc_xprt_dequeue(pool); | |
637 | if (xprt) { | |
638 | rqstp->rq_xprt = xprt; | |
639 | svc_xprt_get(xprt); | |
f16b6e8d N |
640 | |
641 | /* As there is a shortage of threads and this request | |
6610f720 | 642 | * had to be queued, don't allow the thread to wait so |
f16b6e8d N |
643 | * long for cache updates. |
644 | */ | |
645 | rqstp->rq_chandle.thread_wait = 1*HZ; | |
0f0257ea TT |
646 | } else { |
647 | /* No data pending. Go to sleep */ | |
648 | svc_thread_enqueue(pool, rqstp); | |
649 | ||
650 | /* | |
651 | * We have to be able to interrupt this wait | |
652 | * to bring down the daemons ... | |
653 | */ | |
654 | set_current_state(TASK_INTERRUPTIBLE); | |
7086721f JL |
655 | |
656 | /* | |
657 | * checking kthread_should_stop() here allows us to avoid | |
658 | * locking and signalling when stopping kthreads that call | |
659 | * svc_recv. If the thread has already been woken up, then | |
660 | * we can exit here without sleeping. If not, then it | |
661 | * it'll be woken up quickly during the schedule_timeout | |
662 | */ | |
663 | if (kthread_should_stop()) { | |
664 | set_current_state(TASK_RUNNING); | |
665 | spin_unlock_bh(&pool->sp_lock); | |
666 | return -EINTR; | |
667 | } | |
668 | ||
0f0257ea TT |
669 | add_wait_queue(&rqstp->rq_wait, &wait); |
670 | spin_unlock_bh(&pool->sp_lock); | |
671 | ||
03cf6c9f | 672 | time_left = schedule_timeout(timeout); |
0f0257ea TT |
673 | |
674 | try_to_freeze(); | |
675 | ||
676 | spin_lock_bh(&pool->sp_lock); | |
677 | remove_wait_queue(&rqstp->rq_wait, &wait); | |
03cf6c9f GB |
678 | if (!time_left) |
679 | pool->sp_stats.threads_timedout++; | |
0f0257ea TT |
680 | |
681 | xprt = rqstp->rq_xprt; | |
682 | if (!xprt) { | |
683 | svc_thread_dequeue(pool, rqstp); | |
684 | spin_unlock_bh(&pool->sp_lock); | |
685 | dprintk("svc: server %p, no data yet\n", rqstp); | |
7086721f JL |
686 | if (signalled() || kthread_should_stop()) |
687 | return -EINTR; | |
688 | else | |
689 | return -EAGAIN; | |
0f0257ea TT |
690 | } |
691 | } | |
692 | spin_unlock_bh(&pool->sp_lock); | |
693 | ||
694 | len = 0; | |
1b644b6e BF |
695 | if (test_bit(XPT_CLOSE, &xprt->xpt_flags)) { |
696 | dprintk("svc_recv: found XPT_CLOSE\n"); | |
697 | svc_delete_xprt(xprt); | |
ca7896cd BF |
698 | /* Leave XPT_BUSY set on the dead xprt: */ |
699 | goto out; | |
700 | } | |
701 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) { | |
0f0257ea TT |
702 | struct svc_xprt *newxpt; |
703 | newxpt = xprt->xpt_ops->xpo_accept(xprt); | |
704 | if (newxpt) { | |
705 | /* | |
706 | * We know this module_get will succeed because the | |
707 | * listener holds a reference too | |
708 | */ | |
709 | __module_get(newxpt->xpt_class->xcl_owner); | |
710 | svc_check_conn_limits(xprt->xpt_server); | |
711 | spin_lock_bh(&serv->sv_lock); | |
712 | set_bit(XPT_TEMP, &newxpt->xpt_flags); | |
713 | list_add(&newxpt->xpt_list, &serv->sv_tempsocks); | |
714 | serv->sv_tmpcnt++; | |
715 | if (serv->sv_temptimer.function == NULL) { | |
716 | /* setup timer to age temp transports */ | |
717 | setup_timer(&serv->sv_temptimer, | |
718 | svc_age_temp_xprts, | |
719 | (unsigned long)serv); | |
720 | mod_timer(&serv->sv_temptimer, | |
721 | jiffies + svc_conn_age_period * HZ); | |
722 | } | |
723 | spin_unlock_bh(&serv->sv_lock); | |
724 | svc_xprt_received(newxpt); | |
725 | } | |
9c335c0b | 726 | } else if (xprt->xpt_ops->xpo_has_wspace(xprt)) { |
0f0257ea TT |
727 | dprintk("svc: server %p, pool %u, transport %p, inuse=%d\n", |
728 | rqstp, pool->sp_id, xprt, | |
729 | atomic_read(&xprt->xpt_ref.refcount)); | |
730 | rqstp->rq_deferred = svc_deferred_dequeue(xprt); | |
ca7896cd | 731 | if (rqstp->rq_deferred) |
0f0257ea | 732 | len = svc_deferred_recv(rqstp); |
ca7896cd | 733 | else |
0f0257ea TT |
734 | len = xprt->xpt_ops->xpo_recvfrom(rqstp); |
735 | dprintk("svc: got len=%d\n", len); | |
d10f27a7 BF |
736 | rqstp->rq_reserved = serv->sv_max_mesg; |
737 | atomic_add(rqstp->rq_reserved, &xprt->xpt_reserved); | |
0f0257ea | 738 | } |
ca7896cd | 739 | svc_xprt_received(xprt); |
0f0257ea TT |
740 | |
741 | /* No data, incomplete (TCP) read, or accept() */ | |
ca7896cd BF |
742 | if (len == 0 || len == -EAGAIN) |
743 | goto out; | |
744 | ||
0f0257ea TT |
745 | clear_bit(XPT_OLD, &xprt->xpt_flags); |
746 | ||
747 | rqstp->rq_secure = svc_port_is_privileged(svc_addr(rqstp)); | |
748 | rqstp->rq_chandle.defer = svc_defer; | |
749 | ||
750 | if (serv->sv_stats) | |
751 | serv->sv_stats->netcnt++; | |
752 | return len; | |
ca7896cd BF |
753 | out: |
754 | rqstp->rq_res.len = 0; | |
755 | svc_xprt_release(rqstp); | |
756 | return -EAGAIN; | |
0f0257ea | 757 | } |
24c3767e | 758 | EXPORT_SYMBOL_GPL(svc_recv); |
0f0257ea TT |
759 | |
760 | /* | |
761 | * Drop request | |
762 | */ | |
763 | void svc_drop(struct svc_rqst *rqstp) | |
764 | { | |
765 | dprintk("svc: xprt %p dropped request\n", rqstp->rq_xprt); | |
766 | svc_xprt_release(rqstp); | |
767 | } | |
24c3767e | 768 | EXPORT_SYMBOL_GPL(svc_drop); |
0f0257ea TT |
769 | |
770 | /* | |
771 | * Return reply to client. | |
772 | */ | |
773 | int svc_send(struct svc_rqst *rqstp) | |
774 | { | |
775 | struct svc_xprt *xprt; | |
776 | int len; | |
777 | struct xdr_buf *xb; | |
778 | ||
779 | xprt = rqstp->rq_xprt; | |
780 | if (!xprt) | |
781 | return -EFAULT; | |
782 | ||
783 | /* release the receive skb before sending the reply */ | |
784 | rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); | |
785 | ||
786 | /* calculate over-all length */ | |
787 | xb = &rqstp->rq_res; | |
788 | xb->len = xb->head[0].iov_len + | |
789 | xb->page_len + | |
790 | xb->tail[0].iov_len; | |
791 | ||
792 | /* Grab mutex to serialize outgoing data. */ | |
793 | mutex_lock(&xprt->xpt_mutex); | |
f06f00a2 BF |
794 | if (test_bit(XPT_DEAD, &xprt->xpt_flags) |
795 | || test_bit(XPT_CLOSE, &xprt->xpt_flags)) | |
0f0257ea TT |
796 | len = -ENOTCONN; |
797 | else | |
798 | len = xprt->xpt_ops->xpo_sendto(rqstp); | |
799 | mutex_unlock(&xprt->xpt_mutex); | |
4cfc7e60 | 800 | rpc_wake_up(&xprt->xpt_bc_pending); |
0f0257ea TT |
801 | svc_xprt_release(rqstp); |
802 | ||
803 | if (len == -ECONNREFUSED || len == -ENOTCONN || len == -EAGAIN) | |
804 | return 0; | |
805 | return len; | |
806 | } | |
807 | ||
808 | /* | |
809 | * Timer function to close old temporary transports, using | |
810 | * a mark-and-sweep algorithm. | |
811 | */ | |
812 | static void svc_age_temp_xprts(unsigned long closure) | |
813 | { | |
814 | struct svc_serv *serv = (struct svc_serv *)closure; | |
815 | struct svc_xprt *xprt; | |
816 | struct list_head *le, *next; | |
817 | LIST_HEAD(to_be_aged); | |
818 | ||
819 | dprintk("svc_age_temp_xprts\n"); | |
820 | ||
821 | if (!spin_trylock_bh(&serv->sv_lock)) { | |
822 | /* busy, try again 1 sec later */ | |
823 | dprintk("svc_age_temp_xprts: busy\n"); | |
824 | mod_timer(&serv->sv_temptimer, jiffies + HZ); | |
825 | return; | |
826 | } | |
827 | ||
828 | list_for_each_safe(le, next, &serv->sv_tempsocks) { | |
829 | xprt = list_entry(le, struct svc_xprt, xpt_list); | |
830 | ||
831 | /* First time through, just mark it OLD. Second time | |
832 | * through, close it. */ | |
833 | if (!test_and_set_bit(XPT_OLD, &xprt->xpt_flags)) | |
834 | continue; | |
f64f9e71 JP |
835 | if (atomic_read(&xprt->xpt_ref.refcount) > 1 || |
836 | test_bit(XPT_BUSY, &xprt->xpt_flags)) | |
0f0257ea TT |
837 | continue; |
838 | svc_xprt_get(xprt); | |
839 | list_move(le, &to_be_aged); | |
840 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
841 | set_bit(XPT_DETACHED, &xprt->xpt_flags); | |
842 | } | |
843 | spin_unlock_bh(&serv->sv_lock); | |
844 | ||
845 | while (!list_empty(&to_be_aged)) { | |
846 | le = to_be_aged.next; | |
847 | /* fiddling the xpt_list node is safe 'cos we're XPT_DETACHED */ | |
848 | list_del_init(le); | |
849 | xprt = list_entry(le, struct svc_xprt, xpt_list); | |
850 | ||
851 | dprintk("queuing xprt %p for closing\n", xprt); | |
852 | ||
853 | /* a thread will dequeue and close it soon */ | |
854 | svc_xprt_enqueue(xprt); | |
855 | svc_xprt_put(xprt); | |
856 | } | |
857 | ||
858 | mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ); | |
859 | } | |
860 | ||
edc7a894 BF |
861 | static void call_xpt_users(struct svc_xprt *xprt) |
862 | { | |
863 | struct svc_xpt_user *u; | |
864 | ||
865 | spin_lock(&xprt->xpt_lock); | |
866 | while (!list_empty(&xprt->xpt_users)) { | |
867 | u = list_first_entry(&xprt->xpt_users, struct svc_xpt_user, list); | |
868 | list_del(&u->list); | |
869 | u->callback(u); | |
870 | } | |
871 | spin_unlock(&xprt->xpt_lock); | |
872 | } | |
873 | ||
0f0257ea TT |
874 | /* |
875 | * Remove a dead transport | |
876 | */ | |
7710ec36 | 877 | static void svc_delete_xprt(struct svc_xprt *xprt) |
0f0257ea TT |
878 | { |
879 | struct svc_serv *serv = xprt->xpt_server; | |
22945e4a TT |
880 | struct svc_deferred_req *dr; |
881 | ||
882 | /* Only do this once */ | |
883 | if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags)) | |
ac9303eb | 884 | BUG(); |
0f0257ea TT |
885 | |
886 | dprintk("svc: svc_delete_xprt(%p)\n", xprt); | |
887 | xprt->xpt_ops->xpo_detach(xprt); | |
888 | ||
889 | spin_lock_bh(&serv->sv_lock); | |
890 | if (!test_and_set_bit(XPT_DETACHED, &xprt->xpt_flags)) | |
891 | list_del_init(&xprt->xpt_list); | |
b4f36f88 | 892 | BUG_ON(!list_empty(&xprt->xpt_ready)); |
22945e4a TT |
893 | if (test_bit(XPT_TEMP, &xprt->xpt_flags)) |
894 | serv->sv_tmpcnt--; | |
788e69e5 | 895 | spin_unlock_bh(&serv->sv_lock); |
22945e4a | 896 | |
ab1b18f7 | 897 | while ((dr = svc_deferred_dequeue(xprt)) != NULL) |
22945e4a | 898 | kfree(dr); |
22945e4a | 899 | |
edc7a894 | 900 | call_xpt_users(xprt); |
22945e4a | 901 | svc_xprt_put(xprt); |
0f0257ea TT |
902 | } |
903 | ||
904 | void svc_close_xprt(struct svc_xprt *xprt) | |
905 | { | |
906 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
907 | if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) | |
908 | /* someone else will have to effect the close */ | |
909 | return; | |
b1763316 BF |
910 | /* |
911 | * We expect svc_close_xprt() to work even when no threads are | |
912 | * running (e.g., while configuring the server before starting | |
913 | * any threads), so if the transport isn't busy, we delete | |
914 | * it ourself: | |
915 | */ | |
0f0257ea | 916 | svc_delete_xprt(xprt); |
0f0257ea | 917 | } |
a217813f | 918 | EXPORT_SYMBOL_GPL(svc_close_xprt); |
0f0257ea | 919 | |
7b147f1f | 920 | static void svc_close_list(struct list_head *xprt_list, struct net *net) |
0f0257ea TT |
921 | { |
922 | struct svc_xprt *xprt; | |
0f0257ea | 923 | |
b4f36f88 | 924 | list_for_each_entry(xprt, xprt_list, xpt_list) { |
7b147f1f SK |
925 | if (xprt->xpt_net != net) |
926 | continue; | |
0f0257ea | 927 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
b4f36f88 | 928 | set_bit(XPT_BUSY, &xprt->xpt_flags); |
0f0257ea TT |
929 | } |
930 | } | |
931 | ||
7b147f1f | 932 | static void svc_clear_pools(struct svc_serv *serv, struct net *net) |
0f0257ea | 933 | { |
b4f36f88 | 934 | struct svc_pool *pool; |
0f0257ea TT |
935 | struct svc_xprt *xprt; |
936 | struct svc_xprt *tmp; | |
b4f36f88 BF |
937 | int i; |
938 | ||
b4f36f88 BF |
939 | for (i = 0; i < serv->sv_nrpools; i++) { |
940 | pool = &serv->sv_pools[i]; | |
941 | ||
942 | spin_lock_bh(&pool->sp_lock); | |
6f513365 | 943 | list_for_each_entry_safe(xprt, tmp, &pool->sp_sockets, xpt_ready) { |
7b147f1f SK |
944 | if (xprt->xpt_net != net) |
945 | continue; | |
b4f36f88 BF |
946 | list_del_init(&xprt->xpt_ready); |
947 | } | |
948 | spin_unlock_bh(&pool->sp_lock); | |
949 | } | |
6f513365 SK |
950 | } |
951 | ||
7b147f1f | 952 | static void svc_clear_list(struct list_head *xprt_list, struct net *net) |
6f513365 SK |
953 | { |
954 | struct svc_xprt *xprt; | |
955 | struct svc_xprt *tmp; | |
956 | ||
3a22bf50 | 957 | list_for_each_entry_safe(xprt, tmp, xprt_list, xpt_list) { |
7b147f1f SK |
958 | if (xprt->xpt_net != net) |
959 | continue; | |
3a22bf50 SK |
960 | svc_delete_xprt(xprt); |
961 | } | |
7b147f1f SK |
962 | list_for_each_entry(xprt, xprt_list, xpt_list) |
963 | BUG_ON(xprt->xpt_net == net); | |
3a22bf50 SK |
964 | } |
965 | ||
7b147f1f | 966 | void svc_close_net(struct svc_serv *serv, struct net *net) |
3a22bf50 | 967 | { |
7b147f1f SK |
968 | svc_close_list(&serv->sv_tempsocks, net); |
969 | svc_close_list(&serv->sv_permsocks, net); | |
6f513365 | 970 | |
7b147f1f | 971 | svc_clear_pools(serv, net); |
f8c0d226 | 972 | /* |
b4f36f88 | 973 | * At this point the sp_sockets lists will stay empty, since |
3ddbe879 | 974 | * svc_xprt_enqueue will not add new entries without taking the |
b4f36f88 | 975 | * sp_lock and checking XPT_BUSY. |
f8c0d226 | 976 | */ |
7b147f1f SK |
977 | svc_clear_list(&serv->sv_tempsocks, net); |
978 | svc_clear_list(&serv->sv_permsocks, net); | |
0f0257ea TT |
979 | } |
980 | ||
981 | /* | |
982 | * Handle defer and revisit of requests | |
983 | */ | |
984 | ||
985 | static void svc_revisit(struct cache_deferred_req *dreq, int too_many) | |
986 | { | |
987 | struct svc_deferred_req *dr = | |
988 | container_of(dreq, struct svc_deferred_req, handle); | |
989 | struct svc_xprt *xprt = dr->xprt; | |
990 | ||
22945e4a TT |
991 | spin_lock(&xprt->xpt_lock); |
992 | set_bit(XPT_DEFERRED, &xprt->xpt_flags); | |
993 | if (too_many || test_bit(XPT_DEAD, &xprt->xpt_flags)) { | |
994 | spin_unlock(&xprt->xpt_lock); | |
995 | dprintk("revisit canceled\n"); | |
0f0257ea TT |
996 | svc_xprt_put(xprt); |
997 | kfree(dr); | |
998 | return; | |
999 | } | |
1000 | dprintk("revisit queued\n"); | |
1001 | dr->xprt = NULL; | |
0f0257ea TT |
1002 | list_add(&dr->handle.recent, &xprt->xpt_deferred); |
1003 | spin_unlock(&xprt->xpt_lock); | |
0f0257ea TT |
1004 | svc_xprt_enqueue(xprt); |
1005 | svc_xprt_put(xprt); | |
1006 | } | |
1007 | ||
260c1d12 TT |
1008 | /* |
1009 | * Save the request off for later processing. The request buffer looks | |
1010 | * like this: | |
1011 | * | |
1012 | * <xprt-header><rpc-header><rpc-pagelist><rpc-tail> | |
1013 | * | |
1014 | * This code can only handle requests that consist of an xprt-header | |
1015 | * and rpc-header. | |
1016 | */ | |
0f0257ea TT |
1017 | static struct cache_deferred_req *svc_defer(struct cache_req *req) |
1018 | { | |
1019 | struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle); | |
0f0257ea TT |
1020 | struct svc_deferred_req *dr; |
1021 | ||
2f425878 | 1022 | if (rqstp->rq_arg.page_len || !rqstp->rq_usedeferral) |
0f0257ea TT |
1023 | return NULL; /* if more than a page, give up FIXME */ |
1024 | if (rqstp->rq_deferred) { | |
1025 | dr = rqstp->rq_deferred; | |
1026 | rqstp->rq_deferred = NULL; | |
1027 | } else { | |
260c1d12 TT |
1028 | size_t skip; |
1029 | size_t size; | |
0f0257ea | 1030 | /* FIXME maybe discard if size too large */ |
260c1d12 | 1031 | size = sizeof(struct svc_deferred_req) + rqstp->rq_arg.len; |
0f0257ea TT |
1032 | dr = kmalloc(size, GFP_KERNEL); |
1033 | if (dr == NULL) | |
1034 | return NULL; | |
1035 | ||
1036 | dr->handle.owner = rqstp->rq_server; | |
1037 | dr->prot = rqstp->rq_prot; | |
1038 | memcpy(&dr->addr, &rqstp->rq_addr, rqstp->rq_addrlen); | |
1039 | dr->addrlen = rqstp->rq_addrlen; | |
1040 | dr->daddr = rqstp->rq_daddr; | |
1041 | dr->argslen = rqstp->rq_arg.len >> 2; | |
260c1d12 TT |
1042 | dr->xprt_hlen = rqstp->rq_xprt_hlen; |
1043 | ||
1044 | /* back up head to the start of the buffer and copy */ | |
1045 | skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1046 | memcpy(dr->args, rqstp->rq_arg.head[0].iov_base - skip, | |
1047 | dr->argslen << 2); | |
0f0257ea TT |
1048 | } |
1049 | svc_xprt_get(rqstp->rq_xprt); | |
1050 | dr->xprt = rqstp->rq_xprt; | |
9e701c61 | 1051 | rqstp->rq_dropme = true; |
0f0257ea TT |
1052 | |
1053 | dr->handle.revisit = svc_revisit; | |
1054 | return &dr->handle; | |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * recv data from a deferred request into an active one | |
1059 | */ | |
1060 | static int svc_deferred_recv(struct svc_rqst *rqstp) | |
1061 | { | |
1062 | struct svc_deferred_req *dr = rqstp->rq_deferred; | |
1063 | ||
260c1d12 TT |
1064 | /* setup iov_base past transport header */ |
1065 | rqstp->rq_arg.head[0].iov_base = dr->args + (dr->xprt_hlen>>2); | |
1066 | /* The iov_len does not include the transport header bytes */ | |
1067 | rqstp->rq_arg.head[0].iov_len = (dr->argslen<<2) - dr->xprt_hlen; | |
0f0257ea | 1068 | rqstp->rq_arg.page_len = 0; |
260c1d12 TT |
1069 | /* The rq_arg.len includes the transport header bytes */ |
1070 | rqstp->rq_arg.len = dr->argslen<<2; | |
0f0257ea TT |
1071 | rqstp->rq_prot = dr->prot; |
1072 | memcpy(&rqstp->rq_addr, &dr->addr, dr->addrlen); | |
1073 | rqstp->rq_addrlen = dr->addrlen; | |
260c1d12 TT |
1074 | /* Save off transport header len in case we get deferred again */ |
1075 | rqstp->rq_xprt_hlen = dr->xprt_hlen; | |
0f0257ea TT |
1076 | rqstp->rq_daddr = dr->daddr; |
1077 | rqstp->rq_respages = rqstp->rq_pages; | |
260c1d12 | 1078 | return (dr->argslen<<2) - dr->xprt_hlen; |
0f0257ea TT |
1079 | } |
1080 | ||
1081 | ||
1082 | static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt) | |
1083 | { | |
1084 | struct svc_deferred_req *dr = NULL; | |
1085 | ||
1086 | if (!test_bit(XPT_DEFERRED, &xprt->xpt_flags)) | |
1087 | return NULL; | |
1088 | spin_lock(&xprt->xpt_lock); | |
0f0257ea TT |
1089 | if (!list_empty(&xprt->xpt_deferred)) { |
1090 | dr = list_entry(xprt->xpt_deferred.next, | |
1091 | struct svc_deferred_req, | |
1092 | handle.recent); | |
1093 | list_del_init(&dr->handle.recent); | |
62bac4af BF |
1094 | } else |
1095 | clear_bit(XPT_DEFERRED, &xprt->xpt_flags); | |
0f0257ea TT |
1096 | spin_unlock(&xprt->xpt_lock); |
1097 | return dr; | |
1098 | } | |
7fcb98d5 | 1099 | |
156e6209 CL |
1100 | /** |
1101 | * svc_find_xprt - find an RPC transport instance | |
1102 | * @serv: pointer to svc_serv to search | |
1103 | * @xcl_name: C string containing transport's class name | |
4cb54ca2 | 1104 | * @net: owner net pointer |
156e6209 CL |
1105 | * @af: Address family of transport's local address |
1106 | * @port: transport's IP port number | |
1107 | * | |
7fcb98d5 TT |
1108 | * Return the transport instance pointer for the endpoint accepting |
1109 | * connections/peer traffic from the specified transport class, | |
1110 | * address family and port. | |
1111 | * | |
1112 | * Specifying 0 for the address family or port is effectively a | |
1113 | * wild-card, and will result in matching the first transport in the | |
1114 | * service's list that has a matching class name. | |
1115 | */ | |
156e6209 | 1116 | struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name, |
4cb54ca2 SK |
1117 | struct net *net, const sa_family_t af, |
1118 | const unsigned short port) | |
7fcb98d5 TT |
1119 | { |
1120 | struct svc_xprt *xprt; | |
1121 | struct svc_xprt *found = NULL; | |
1122 | ||
1123 | /* Sanity check the args */ | |
156e6209 | 1124 | if (serv == NULL || xcl_name == NULL) |
7fcb98d5 TT |
1125 | return found; |
1126 | ||
1127 | spin_lock_bh(&serv->sv_lock); | |
1128 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { | |
4cb54ca2 SK |
1129 | if (xprt->xpt_net != net) |
1130 | continue; | |
7fcb98d5 TT |
1131 | if (strcmp(xprt->xpt_class->xcl_name, xcl_name)) |
1132 | continue; | |
1133 | if (af != AF_UNSPEC && af != xprt->xpt_local.ss_family) | |
1134 | continue; | |
156e6209 | 1135 | if (port != 0 && port != svc_xprt_local_port(xprt)) |
7fcb98d5 TT |
1136 | continue; |
1137 | found = xprt; | |
a217813f | 1138 | svc_xprt_get(xprt); |
7fcb98d5 TT |
1139 | break; |
1140 | } | |
1141 | spin_unlock_bh(&serv->sv_lock); | |
1142 | return found; | |
1143 | } | |
1144 | EXPORT_SYMBOL_GPL(svc_find_xprt); | |
9571af18 | 1145 | |
335c54bd CL |
1146 | static int svc_one_xprt_name(const struct svc_xprt *xprt, |
1147 | char *pos, int remaining) | |
1148 | { | |
1149 | int len; | |
1150 | ||
1151 | len = snprintf(pos, remaining, "%s %u\n", | |
1152 | xprt->xpt_class->xcl_name, | |
1153 | svc_xprt_local_port(xprt)); | |
1154 | if (len >= remaining) | |
1155 | return -ENAMETOOLONG; | |
1156 | return len; | |
1157 | } | |
1158 | ||
1159 | /** | |
1160 | * svc_xprt_names - format a buffer with a list of transport names | |
1161 | * @serv: pointer to an RPC service | |
1162 | * @buf: pointer to a buffer to be filled in | |
1163 | * @buflen: length of buffer to be filled in | |
1164 | * | |
1165 | * Fills in @buf with a string containing a list of transport names, | |
1166 | * each name terminated with '\n'. | |
1167 | * | |
1168 | * Returns positive length of the filled-in string on success; otherwise | |
1169 | * a negative errno value is returned if an error occurs. | |
9571af18 | 1170 | */ |
335c54bd | 1171 | int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen) |
9571af18 TT |
1172 | { |
1173 | struct svc_xprt *xprt; | |
335c54bd CL |
1174 | int len, totlen; |
1175 | char *pos; | |
9571af18 TT |
1176 | |
1177 | /* Sanity check args */ | |
1178 | if (!serv) | |
1179 | return 0; | |
1180 | ||
1181 | spin_lock_bh(&serv->sv_lock); | |
335c54bd CL |
1182 | |
1183 | pos = buf; | |
1184 | totlen = 0; | |
9571af18 | 1185 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { |
335c54bd CL |
1186 | len = svc_one_xprt_name(xprt, pos, buflen - totlen); |
1187 | if (len < 0) { | |
1188 | *buf = '\0'; | |
1189 | totlen = len; | |
1190 | } | |
1191 | if (len <= 0) | |
9571af18 | 1192 | break; |
335c54bd CL |
1193 | |
1194 | pos += len; | |
9571af18 TT |
1195 | totlen += len; |
1196 | } | |
335c54bd | 1197 | |
9571af18 TT |
1198 | spin_unlock_bh(&serv->sv_lock); |
1199 | return totlen; | |
1200 | } | |
1201 | EXPORT_SYMBOL_GPL(svc_xprt_names); | |
03cf6c9f GB |
1202 | |
1203 | ||
1204 | /*----------------------------------------------------------------------------*/ | |
1205 | ||
1206 | static void *svc_pool_stats_start(struct seq_file *m, loff_t *pos) | |
1207 | { | |
1208 | unsigned int pidx = (unsigned int)*pos; | |
1209 | struct svc_serv *serv = m->private; | |
1210 | ||
1211 | dprintk("svc_pool_stats_start, *pidx=%u\n", pidx); | |
1212 | ||
03cf6c9f GB |
1213 | if (!pidx) |
1214 | return SEQ_START_TOKEN; | |
1215 | return (pidx > serv->sv_nrpools ? NULL : &serv->sv_pools[pidx-1]); | |
1216 | } | |
1217 | ||
1218 | static void *svc_pool_stats_next(struct seq_file *m, void *p, loff_t *pos) | |
1219 | { | |
1220 | struct svc_pool *pool = p; | |
1221 | struct svc_serv *serv = m->private; | |
1222 | ||
1223 | dprintk("svc_pool_stats_next, *pos=%llu\n", *pos); | |
1224 | ||
1225 | if (p == SEQ_START_TOKEN) { | |
1226 | pool = &serv->sv_pools[0]; | |
1227 | } else { | |
1228 | unsigned int pidx = (pool - &serv->sv_pools[0]); | |
1229 | if (pidx < serv->sv_nrpools-1) | |
1230 | pool = &serv->sv_pools[pidx+1]; | |
1231 | else | |
1232 | pool = NULL; | |
1233 | } | |
1234 | ++*pos; | |
1235 | return pool; | |
1236 | } | |
1237 | ||
1238 | static void svc_pool_stats_stop(struct seq_file *m, void *p) | |
1239 | { | |
03cf6c9f GB |
1240 | } |
1241 | ||
1242 | static int svc_pool_stats_show(struct seq_file *m, void *p) | |
1243 | { | |
1244 | struct svc_pool *pool = p; | |
1245 | ||
1246 | if (p == SEQ_START_TOKEN) { | |
78c210ef | 1247 | seq_puts(m, "# pool packets-arrived sockets-enqueued threads-woken threads-timedout\n"); |
03cf6c9f GB |
1248 | return 0; |
1249 | } | |
1250 | ||
78c210ef | 1251 | seq_printf(m, "%u %lu %lu %lu %lu\n", |
03cf6c9f GB |
1252 | pool->sp_id, |
1253 | pool->sp_stats.packets, | |
1254 | pool->sp_stats.sockets_queued, | |
1255 | pool->sp_stats.threads_woken, | |
03cf6c9f GB |
1256 | pool->sp_stats.threads_timedout); |
1257 | ||
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | static const struct seq_operations svc_pool_stats_seq_ops = { | |
1262 | .start = svc_pool_stats_start, | |
1263 | .next = svc_pool_stats_next, | |
1264 | .stop = svc_pool_stats_stop, | |
1265 | .show = svc_pool_stats_show, | |
1266 | }; | |
1267 | ||
1268 | int svc_pool_stats_open(struct svc_serv *serv, struct file *file) | |
1269 | { | |
1270 | int err; | |
1271 | ||
1272 | err = seq_open(file, &svc_pool_stats_seq_ops); | |
1273 | if (!err) | |
1274 | ((struct seq_file *) file->private_data)->private = serv; | |
1275 | return err; | |
1276 | } | |
1277 | EXPORT_SYMBOL(svc_pool_stats_open); | |
1278 | ||
1279 | /*----------------------------------------------------------------------------*/ |