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7#include <linux/sched.h>
8#include <linux/errno.h>
9#include <linux/freezer.h>
10#include <linux/kthread.h>
11#include <linux/slab.h>
12#include <net/sock.h>
13#include <linux/sunrpc/addr.h>
14#include <linux/sunrpc/stats.h>
15#include <linux/sunrpc/svc_xprt.h>
16#include <linux/sunrpc/svcsock.h>
17#include <linux/sunrpc/xprt.h>
18#include <linux/module.h>
19#include <linux/netdevice.h>
20#include <trace/events/sunrpc.h>
21
22#define RPCDBG_FACILITY RPCDBG_SVCXPRT
23
24static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt);
25static int svc_deferred_recv(struct svc_rqst *rqstp);
26static struct cache_deferred_req *svc_defer(struct cache_req *req);
27static void svc_age_temp_xprts(unsigned long closure);
28static void svc_delete_xprt(struct svc_xprt *xprt);
29
30
31
32
33
34
35static int svc_conn_age_period = 6*60;
36
37
38static DEFINE_SPINLOCK(svc_xprt_class_lock);
39static LIST_HEAD(svc_xprt_class_list);
40
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70
71int 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
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;
87out:
88 spin_unlock(&svc_xprt_class_lock);
89 return res;
90}
91EXPORT_SYMBOL_GPL(svc_reg_xprt_class);
92
93void 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}
100EXPORT_SYMBOL_GPL(svc_unreg_xprt_class);
101
102
103
104
105int svc_print_xprts(char *buf, int maxlen)
106{
107 struct svc_xprt_class *xcl;
108 char tmpstr[80];
109 int len = 0;
110 buf[0] = '\0';
111
112 spin_lock(&svc_xprt_class_lock);
113 list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) {
114 int slen;
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
128static 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;
133 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags))
134 svcauth_unix_info_release(xprt);
135 put_net(xprt->xpt_net);
136
137 if (xprt->xpt_bc_xprt)
138 xprt_put(xprt->xpt_bc_xprt);
139 xprt->xpt_ops->xpo_free(xprt);
140 module_put(owner);
141}
142
143void svc_xprt_put(struct svc_xprt *xprt)
144{
145 kref_put(&xprt->xpt_ref, svc_xprt_free);
146}
147EXPORT_SYMBOL_GPL(svc_xprt_put);
148
149
150
151
152
153void svc_xprt_init(struct net *net, struct svc_xprt_class *xcl,
154 struct svc_xprt *xprt, struct svc_serv *serv)
155{
156 memset(xprt, 0, sizeof(*xprt));
157 xprt->xpt_class = xcl;
158 xprt->xpt_ops = xcl->xcl_ops;
159 kref_init(&xprt->xpt_ref);
160 xprt->xpt_server = serv;
161 INIT_LIST_HEAD(&xprt->xpt_list);
162 INIT_LIST_HEAD(&xprt->xpt_ready);
163 INIT_LIST_HEAD(&xprt->xpt_deferred);
164 INIT_LIST_HEAD(&xprt->xpt_users);
165 mutex_init(&xprt->xpt_mutex);
166 spin_lock_init(&xprt->xpt_lock);
167 set_bit(XPT_BUSY, &xprt->xpt_flags);
168 rpc_init_wait_queue(&xprt->xpt_bc_pending, "xpt_bc_pending");
169 xprt->xpt_net = get_net(net);
170}
171EXPORT_SYMBOL_GPL(svc_xprt_init);
172
173static struct svc_xprt *__svc_xpo_create(struct svc_xprt_class *xcl,
174 struct svc_serv *serv,
175 struct net *net,
176 const int family,
177 const unsigned short port,
178 int flags)
179{
180 struct sockaddr_in sin = {
181 .sin_family = AF_INET,
182 .sin_addr.s_addr = htonl(INADDR_ANY),
183 .sin_port = htons(port),
184 };
185#if IS_ENABLED(CONFIG_IPV6)
186 struct sockaddr_in6 sin6 = {
187 .sin6_family = AF_INET6,
188 .sin6_addr = IN6ADDR_ANY_INIT,
189 .sin6_port = htons(port),
190 };
191#endif
192 struct sockaddr *sap;
193 size_t len;
194
195 switch (family) {
196 case PF_INET:
197 sap = (struct sockaddr *)&sin;
198 len = sizeof(sin);
199 break;
200#if IS_ENABLED(CONFIG_IPV6)
201 case PF_INET6:
202 sap = (struct sockaddr *)&sin6;
203 len = sizeof(sin6);
204 break;
205#endif
206 default:
207 return ERR_PTR(-EAFNOSUPPORT);
208 }
209
210 return xcl->xcl_ops->xpo_create(serv, net, sap, len, flags);
211}
212
213
214
215
216
217
218
219
220
221static void svc_xprt_received(struct svc_xprt *xprt)
222{
223 if (!test_bit(XPT_BUSY, &xprt->xpt_flags)) {
224 WARN_ONCE(1, "xprt=0x%p already busy!", xprt);
225 return;
226 }
227
228
229
230
231 svc_xprt_get(xprt);
232 smp_mb__before_atomic();
233 clear_bit(XPT_BUSY, &xprt->xpt_flags);
234 xprt->xpt_server->sv_ops->svo_enqueue_xprt(xprt);
235 svc_xprt_put(xprt);
236}
237
238void svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *new)
239{
240 clear_bit(XPT_TEMP, &new->xpt_flags);
241 spin_lock_bh(&serv->sv_lock);
242 list_add(&new->xpt_list, &serv->sv_permsocks);
243 spin_unlock_bh(&serv->sv_lock);
244 svc_xprt_received(new);
245}
246
247int svc_create_xprt(struct svc_serv *serv, const char *xprt_name,
248 struct net *net, const int family,
249 const unsigned short port, int flags)
250{
251 struct svc_xprt_class *xcl;
252
253 dprintk("svc: creating transport %s[%d]\n", xprt_name, port);
254 spin_lock(&svc_xprt_class_lock);
255 list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) {
256 struct svc_xprt *newxprt;
257 unsigned short newport;
258
259 if (strcmp(xprt_name, xcl->xcl_name))
260 continue;
261
262 if (!try_module_get(xcl->xcl_owner))
263 goto err;
264
265 spin_unlock(&svc_xprt_class_lock);
266 newxprt = __svc_xpo_create(xcl, serv, net, family, port, flags);
267 if (IS_ERR(newxprt)) {
268 module_put(xcl->xcl_owner);
269 return PTR_ERR(newxprt);
270 }
271 svc_add_new_perm_xprt(serv, newxprt);
272 newport = svc_xprt_local_port(newxprt);
273 return newport;
274 }
275 err:
276 spin_unlock(&svc_xprt_class_lock);
277 dprintk("svc: transport %s not found\n", xprt_name);
278
279
280
281 return -EPROTONOSUPPORT;
282}
283EXPORT_SYMBOL_GPL(svc_create_xprt);
284
285
286
287
288void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt)
289{
290 memcpy(&rqstp->rq_addr, &xprt->xpt_remote, xprt->xpt_remotelen);
291 rqstp->rq_addrlen = xprt->xpt_remotelen;
292
293
294
295
296
297 memcpy(&rqstp->rq_daddr, &xprt->xpt_local, xprt->xpt_locallen);
298 rqstp->rq_daddrlen = xprt->xpt_locallen;
299}
300EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs);
301
302
303
304
305
306
307
308
309char *svc_print_addr(struct svc_rqst *rqstp, char *buf, size_t len)
310{
311 return __svc_print_addr(svc_addr(rqstp), buf, len);
312}
313EXPORT_SYMBOL_GPL(svc_print_addr);
314
315static bool svc_xprt_has_something_to_do(struct svc_xprt *xprt)
316{
317 if (xprt->xpt_flags & ((1<<XPT_CONN)|(1<<XPT_CLOSE)))
318 return true;
319 if (xprt->xpt_flags & ((1<<XPT_DATA)|(1<<XPT_DEFERRED)))
320 return xprt->xpt_ops->xpo_has_wspace(xprt);
321 return false;
322}
323
324void svc_xprt_do_enqueue(struct svc_xprt *xprt)
325{
326 struct svc_pool *pool;
327 struct svc_rqst *rqstp = NULL;
328 int cpu;
329 bool queued = false;
330
331 if (!svc_xprt_has_something_to_do(xprt))
332 goto out;
333
334
335
336
337
338
339 if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) {
340
341 dprintk("svc: transport %p busy, not enqueued\n", xprt);
342 goto out;
343 }
344
345 cpu = get_cpu();
346 pool = svc_pool_for_cpu(xprt->xpt_server, cpu);
347
348 atomic_long_inc(&pool->sp_stats.packets);
349
350redo_search:
351
352 rcu_read_lock();
353 list_for_each_entry_rcu(rqstp, &pool->sp_all_threads, rq_all) {
354
355 if (test_bit(RQ_BUSY, &rqstp->rq_flags))
356 continue;
357
358
359
360
361
362
363
364 if (!queued) {
365 spin_lock_bh(&rqstp->rq_lock);
366 if (test_and_set_bit(RQ_BUSY, &rqstp->rq_flags)) {
367
368 spin_unlock_bh(&rqstp->rq_lock);
369 continue;
370 }
371
372
373 rqstp->rq_xprt = xprt;
374 svc_xprt_get(xprt);
375 spin_unlock_bh(&rqstp->rq_lock);
376 }
377 rcu_read_unlock();
378
379 atomic_long_inc(&pool->sp_stats.threads_woken);
380 wake_up_process(rqstp->rq_task);
381 put_cpu();
382 goto out;
383 }
384 rcu_read_unlock();
385
386
387
388
389
390
391
392 if (!queued) {
393 queued = true;
394 dprintk("svc: transport %p put into queue\n", xprt);
395 spin_lock_bh(&pool->sp_lock);
396 list_add_tail(&xprt->xpt_ready, &pool->sp_sockets);
397 pool->sp_stats.sockets_queued++;
398 spin_unlock_bh(&pool->sp_lock);
399 goto redo_search;
400 }
401 rqstp = NULL;
402 put_cpu();
403out:
404 trace_svc_xprt_do_enqueue(xprt, rqstp);
405}
406EXPORT_SYMBOL_GPL(svc_xprt_do_enqueue);
407
408
409
410
411
412
413void svc_xprt_enqueue(struct svc_xprt *xprt)
414{
415 if (test_bit(XPT_BUSY, &xprt->xpt_flags))
416 return;
417 xprt->xpt_server->sv_ops->svo_enqueue_xprt(xprt);
418}
419EXPORT_SYMBOL_GPL(svc_xprt_enqueue);
420
421
422
423
424static struct svc_xprt *svc_xprt_dequeue(struct svc_pool *pool)
425{
426 struct svc_xprt *xprt = NULL;
427
428 if (list_empty(&pool->sp_sockets))
429 goto out;
430
431 spin_lock_bh(&pool->sp_lock);
432 if (likely(!list_empty(&pool->sp_sockets))) {
433 xprt = list_first_entry(&pool->sp_sockets,
434 struct svc_xprt, xpt_ready);
435 list_del_init(&xprt->xpt_ready);
436 svc_xprt_get(xprt);
437
438 dprintk("svc: transport %p dequeued, inuse=%d\n",
439 xprt, atomic_read(&xprt->xpt_ref.refcount));
440 }
441 spin_unlock_bh(&pool->sp_lock);
442out:
443 trace_svc_xprt_dequeue(xprt);
444 return xprt;
445}
446
447
448
449
450
451
452
453
454
455
456
457void svc_reserve(struct svc_rqst *rqstp, int space)
458{
459 space += rqstp->rq_res.head[0].iov_len;
460
461 if (space < rqstp->rq_reserved) {
462 struct svc_xprt *xprt = rqstp->rq_xprt;
463 atomic_sub((rqstp->rq_reserved - space), &xprt->xpt_reserved);
464 rqstp->rq_reserved = space;
465
466 if (xprt->xpt_ops->xpo_adjust_wspace)
467 xprt->xpt_ops->xpo_adjust_wspace(xprt);
468 svc_xprt_enqueue(xprt);
469 }
470}
471EXPORT_SYMBOL_GPL(svc_reserve);
472
473static void svc_xprt_release(struct svc_rqst *rqstp)
474{
475 struct svc_xprt *xprt = rqstp->rq_xprt;
476
477 rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp);
478
479 kfree(rqstp->rq_deferred);
480 rqstp->rq_deferred = NULL;
481
482 svc_free_res_pages(rqstp);
483 rqstp->rq_res.page_len = 0;
484 rqstp->rq_res.page_base = 0;
485
486
487
488
489
490
491 if ((rqstp->rq_res.len) > rqstp->rq_reserved)
492 printk(KERN_ERR "RPC request reserved %d but used %d\n",
493 rqstp->rq_reserved,
494 rqstp->rq_res.len);
495
496 rqstp->rq_res.head[0].iov_len = 0;
497 svc_reserve(rqstp, 0);
498 rqstp->rq_xprt = NULL;
499
500 svc_xprt_put(xprt);
501}
502
503
504
505
506
507
508
509
510void svc_wake_up(struct svc_serv *serv)
511{
512 struct svc_rqst *rqstp;
513 struct svc_pool *pool;
514
515 pool = &serv->sv_pools[0];
516
517 rcu_read_lock();
518 list_for_each_entry_rcu(rqstp, &pool->sp_all_threads, rq_all) {
519
520 if (test_bit(RQ_BUSY, &rqstp->rq_flags))
521 continue;
522 rcu_read_unlock();
523 dprintk("svc: daemon %p woken up.\n", rqstp);
524 wake_up_process(rqstp->rq_task);
525 trace_svc_wake_up(rqstp->rq_task->pid);
526 return;
527 }
528 rcu_read_unlock();
529
530
531 set_bit(SP_TASK_PENDING, &pool->sp_flags);
532 smp_wmb();
533 trace_svc_wake_up(0);
534}
535EXPORT_SYMBOL_GPL(svc_wake_up);
536
537int svc_port_is_privileged(struct sockaddr *sin)
538{
539 switch (sin->sa_family) {
540 case AF_INET:
541 return ntohs(((struct sockaddr_in *)sin)->sin_port)
542 < PROT_SOCK;
543 case AF_INET6:
544 return ntohs(((struct sockaddr_in6 *)sin)->sin6_port)
545 < PROT_SOCK;
546 default:
547 return 0;
548 }
549}
550
551
552
553
554
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556
557
558
559
560
561
562
563
564
565
566
567
568
569static void svc_check_conn_limits(struct svc_serv *serv)
570{
571 unsigned int limit = serv->sv_maxconn ? serv->sv_maxconn :
572 (serv->sv_nrthreads+3) * 20;
573
574 if (serv->sv_tmpcnt > limit) {
575 struct svc_xprt *xprt = NULL;
576 spin_lock_bh(&serv->sv_lock);
577 if (!list_empty(&serv->sv_tempsocks)) {
578
579 net_notice_ratelimited("%s: too many open connections, consider increasing the %s\n",
580 serv->sv_name, serv->sv_maxconn ?
581 "max number of connections" :
582 "number of threads");
583
584
585
586
587 xprt = list_entry(serv->sv_tempsocks.prev,
588 struct svc_xprt,
589 xpt_list);
590 set_bit(XPT_CLOSE, &xprt->xpt_flags);
591 svc_xprt_get(xprt);
592 }
593 spin_unlock_bh(&serv->sv_lock);
594
595 if (xprt) {
596 svc_xprt_enqueue(xprt);
597 svc_xprt_put(xprt);
598 }
599 }
600}
601
602static int svc_alloc_arg(struct svc_rqst *rqstp)
603{
604 struct svc_serv *serv = rqstp->rq_server;
605 struct xdr_buf *arg;
606 int pages;
607 int i;
608
609
610 pages = (serv->sv_max_mesg + PAGE_SIZE) / PAGE_SIZE;
611 WARN_ON_ONCE(pages >= RPCSVC_MAXPAGES);
612 if (pages >= RPCSVC_MAXPAGES)
613
614 pages = RPCSVC_MAXPAGES - 1;
615 for (i = 0; i < pages ; i++)
616 while (rqstp->rq_pages[i] == NULL) {
617 struct page *p = alloc_page(GFP_KERNEL);
618 if (!p) {
619 set_current_state(TASK_INTERRUPTIBLE);
620 if (signalled() || kthread_should_stop()) {
621 set_current_state(TASK_RUNNING);
622 return -EINTR;
623 }
624 schedule_timeout(msecs_to_jiffies(500));
625 }
626 rqstp->rq_pages[i] = p;
627 }
628 rqstp->rq_page_end = &rqstp->rq_pages[i];
629 rqstp->rq_pages[i++] = NULL;
630
631
632 arg = &rqstp->rq_arg;
633 arg->head[0].iov_base = page_address(rqstp->rq_pages[0]);
634 arg->head[0].iov_len = PAGE_SIZE;
635 arg->pages = rqstp->rq_pages + 1;
636 arg->page_base = 0;
637
638 arg->page_len = (pages-2)*PAGE_SIZE;
639 arg->len = (pages-1)*PAGE_SIZE;
640 arg->tail[0].iov_len = 0;
641 return 0;
642}
643
644static bool
645rqst_should_sleep(struct svc_rqst *rqstp)
646{
647 struct svc_pool *pool = rqstp->rq_pool;
648
649
650 if (test_and_clear_bit(SP_TASK_PENDING, &pool->sp_flags))
651 return false;
652
653
654 if (!list_empty(&pool->sp_sockets))
655 return false;
656
657
658 if (signalled() || kthread_should_stop())
659 return false;
660
661
662 if (freezing(current))
663 return false;
664
665 return true;
666}
667
668static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout)
669{
670 struct svc_xprt *xprt;
671 struct svc_pool *pool = rqstp->rq_pool;
672 long time_left = 0;
673
674
675 WARN_ON_ONCE(rqstp->rq_xprt);
676
677
678
679
680 rqstp->rq_chandle.thread_wait = 5*HZ;
681
682 xprt = svc_xprt_dequeue(pool);
683 if (xprt) {
684 rqstp->rq_xprt = xprt;
685
686
687
688
689
690 rqstp->rq_chandle.thread_wait = 1*HZ;
691 clear_bit(SP_TASK_PENDING, &pool->sp_flags);
692 return xprt;
693 }
694
695
696
697
698
699 set_current_state(TASK_INTERRUPTIBLE);
700 clear_bit(RQ_BUSY, &rqstp->rq_flags);
701 smp_mb();
702
703 if (likely(rqst_should_sleep(rqstp)))
704 time_left = schedule_timeout(timeout);
705 else
706 __set_current_state(TASK_RUNNING);
707
708 try_to_freeze();
709
710 spin_lock_bh(&rqstp->rq_lock);
711 set_bit(RQ_BUSY, &rqstp->rq_flags);
712 spin_unlock_bh(&rqstp->rq_lock);
713
714 xprt = rqstp->rq_xprt;
715 if (xprt != NULL)
716 return xprt;
717
718 if (!time_left)
719 atomic_long_inc(&pool->sp_stats.threads_timedout);
720
721 if (signalled() || kthread_should_stop())
722 return ERR_PTR(-EINTR);
723 return ERR_PTR(-EAGAIN);
724}
725
726static void svc_add_new_temp_xprt(struct svc_serv *serv, struct svc_xprt *newxpt)
727{
728 spin_lock_bh(&serv->sv_lock);
729 set_bit(XPT_TEMP, &newxpt->xpt_flags);
730 list_add(&newxpt->xpt_list, &serv->sv_tempsocks);
731 serv->sv_tmpcnt++;
732 if (serv->sv_temptimer.function == NULL) {
733
734 setup_timer(&serv->sv_temptimer, svc_age_temp_xprts,
735 (unsigned long)serv);
736 mod_timer(&serv->sv_temptimer,
737 jiffies + svc_conn_age_period * HZ);
738 }
739 spin_unlock_bh(&serv->sv_lock);
740 svc_xprt_received(newxpt);
741}
742
743static int svc_handle_xprt(struct svc_rqst *rqstp, struct svc_xprt *xprt)
744{
745 struct svc_serv *serv = rqstp->rq_server;
746 int len = 0;
747
748 if (test_bit(XPT_CLOSE, &xprt->xpt_flags)) {
749 dprintk("svc_recv: found XPT_CLOSE\n");
750 svc_delete_xprt(xprt);
751
752 goto out;
753 }
754 if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
755 struct svc_xprt *newxpt;
756
757
758
759
760 __module_get(xprt->xpt_class->xcl_owner);
761 svc_check_conn_limits(xprt->xpt_server);
762 newxpt = xprt->xpt_ops->xpo_accept(xprt);
763 if (newxpt)
764 svc_add_new_temp_xprt(serv, newxpt);
765 else
766 module_put(xprt->xpt_class->xcl_owner);
767 } else {
768
769 dprintk("svc: server %p, pool %u, transport %p, inuse=%d\n",
770 rqstp, rqstp->rq_pool->sp_id, xprt,
771 atomic_read(&xprt->xpt_ref.refcount));
772 rqstp->rq_deferred = svc_deferred_dequeue(xprt);
773 if (rqstp->rq_deferred)
774 len = svc_deferred_recv(rqstp);
775 else
776 len = xprt->xpt_ops->xpo_recvfrom(rqstp);
777 dprintk("svc: got len=%d\n", len);
778 rqstp->rq_reserved = serv->sv_max_mesg;
779 atomic_add(rqstp->rq_reserved, &xprt->xpt_reserved);
780 }
781
782 svc_xprt_received(xprt);
783out:
784 trace_svc_handle_xprt(xprt, len);
785 return len;
786}
787
788
789
790
791
792
793int svc_recv(struct svc_rqst *rqstp, long timeout)
794{
795 struct svc_xprt *xprt = NULL;
796 struct svc_serv *serv = rqstp->rq_server;
797 int len, err;
798
799 dprintk("svc: server %p waiting for data (to = %ld)\n",
800 rqstp, timeout);
801
802 if (rqstp->rq_xprt)
803 printk(KERN_ERR
804 "svc_recv: service %p, transport not NULL!\n",
805 rqstp);
806
807 err = svc_alloc_arg(rqstp);
808 if (err)
809 goto out;
810
811 try_to_freeze();
812 cond_resched();
813 err = -EINTR;
814 if (signalled() || kthread_should_stop())
815 goto out;
816
817 xprt = svc_get_next_xprt(rqstp, timeout);
818 if (IS_ERR(xprt)) {
819 err = PTR_ERR(xprt);
820 goto out;
821 }
822
823 len = svc_handle_xprt(rqstp, xprt);
824
825
826 err = -EAGAIN;
827 if (len <= 0)
828 goto out_release;
829
830 clear_bit(XPT_OLD, &xprt->xpt_flags);
831
832 if (xprt->xpt_ops->xpo_secure_port(rqstp))
833 set_bit(RQ_SECURE, &rqstp->rq_flags);
834 else
835 clear_bit(RQ_SECURE, &rqstp->rq_flags);
836 rqstp->rq_chandle.defer = svc_defer;
837 rqstp->rq_xid = svc_getu32(&rqstp->rq_arg.head[0]);
838
839 if (serv->sv_stats)
840 serv->sv_stats->netcnt++;
841 trace_svc_recv(rqstp, len);
842 return len;
843out_release:
844 rqstp->rq_res.len = 0;
845 svc_xprt_release(rqstp);
846out:
847 trace_svc_recv(rqstp, err);
848 return err;
849}
850EXPORT_SYMBOL_GPL(svc_recv);
851
852
853
854
855void svc_drop(struct svc_rqst *rqstp)
856{
857 dprintk("svc: xprt %p dropped request\n", rqstp->rq_xprt);
858 svc_xprt_release(rqstp);
859}
860EXPORT_SYMBOL_GPL(svc_drop);
861
862
863
864
865int svc_send(struct svc_rqst *rqstp)
866{
867 struct svc_xprt *xprt;
868 int len = -EFAULT;
869 struct xdr_buf *xb;
870
871 xprt = rqstp->rq_xprt;
872 if (!xprt)
873 goto out;
874
875
876 rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp);
877
878
879 xb = &rqstp->rq_res;
880 xb->len = xb->head[0].iov_len +
881 xb->page_len +
882 xb->tail[0].iov_len;
883
884
885 mutex_lock(&xprt->xpt_mutex);
886 if (test_bit(XPT_DEAD, &xprt->xpt_flags)
887 || test_bit(XPT_CLOSE, &xprt->xpt_flags))
888 len = -ENOTCONN;
889 else
890 len = xprt->xpt_ops->xpo_sendto(rqstp);
891 mutex_unlock(&xprt->xpt_mutex);
892 rpc_wake_up(&xprt->xpt_bc_pending);
893 svc_xprt_release(rqstp);
894
895 if (len == -ECONNREFUSED || len == -ENOTCONN || len == -EAGAIN)
896 len = 0;
897out:
898 trace_svc_send(rqstp, len);
899 return len;
900}
901
902
903
904
905
906static void svc_age_temp_xprts(unsigned long closure)
907{
908 struct svc_serv *serv = (struct svc_serv *)closure;
909 struct svc_xprt *xprt;
910 struct list_head *le, *next;
911
912 dprintk("svc_age_temp_xprts\n");
913
914 if (!spin_trylock_bh(&serv->sv_lock)) {
915
916 dprintk("svc_age_temp_xprts: busy\n");
917 mod_timer(&serv->sv_temptimer, jiffies + HZ);
918 return;
919 }
920
921 list_for_each_safe(le, next, &serv->sv_tempsocks) {
922 xprt = list_entry(le, struct svc_xprt, xpt_list);
923
924
925
926 if (!test_and_set_bit(XPT_OLD, &xprt->xpt_flags))
927 continue;
928 if (atomic_read(&xprt->xpt_ref.refcount) > 1 ||
929 test_bit(XPT_BUSY, &xprt->xpt_flags))
930 continue;
931 list_del_init(le);
932 set_bit(XPT_CLOSE, &xprt->xpt_flags);
933 dprintk("queuing xprt %p for closing\n", xprt);
934
935
936 svc_xprt_enqueue(xprt);
937 }
938 spin_unlock_bh(&serv->sv_lock);
939
940 mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ);
941}
942
943
944
945
946
947
948
949void svc_age_temp_xprts_now(struct svc_serv *serv, struct sockaddr *server_addr)
950{
951 struct svc_xprt *xprt;
952 struct svc_sock *svsk;
953 struct socket *sock;
954 struct list_head *le, *next;
955 LIST_HEAD(to_be_closed);
956 struct linger no_linger = {
957 .l_onoff = 1,
958 .l_linger = 0,
959 };
960
961 spin_lock_bh(&serv->sv_lock);
962 list_for_each_safe(le, next, &serv->sv_tempsocks) {
963 xprt = list_entry(le, struct svc_xprt, xpt_list);
964 if (rpc_cmp_addr(server_addr, (struct sockaddr *)
965 &xprt->xpt_local)) {
966 dprintk("svc_age_temp_xprts_now: found %p\n", xprt);
967 list_move(le, &to_be_closed);
968 }
969 }
970 spin_unlock_bh(&serv->sv_lock);
971
972 while (!list_empty(&to_be_closed)) {
973 le = to_be_closed.next;
974 list_del_init(le);
975 xprt = list_entry(le, struct svc_xprt, xpt_list);
976 dprintk("svc_age_temp_xprts_now: closing %p\n", xprt);
977 svsk = container_of(xprt, struct svc_sock, sk_xprt);
978 sock = svsk->sk_sock;
979 kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
980 (char *)&no_linger, sizeof(no_linger));
981 svc_close_xprt(xprt);
982 }
983}
984EXPORT_SYMBOL_GPL(svc_age_temp_xprts_now);
985
986static void call_xpt_users(struct svc_xprt *xprt)
987{
988 struct svc_xpt_user *u;
989
990 spin_lock(&xprt->xpt_lock);
991 while (!list_empty(&xprt->xpt_users)) {
992 u = list_first_entry(&xprt->xpt_users, struct svc_xpt_user, list);
993 list_del(&u->list);
994 u->callback(u);
995 }
996 spin_unlock(&xprt->xpt_lock);
997}
998
999
1000
1001
1002static void svc_delete_xprt(struct svc_xprt *xprt)
1003{
1004 struct svc_serv *serv = xprt->xpt_server;
1005 struct svc_deferred_req *dr;
1006
1007
1008 if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags))
1009 BUG();
1010
1011 dprintk("svc: svc_delete_xprt(%p)\n", xprt);
1012 xprt->xpt_ops->xpo_detach(xprt);
1013
1014 spin_lock_bh(&serv->sv_lock);
1015 list_del_init(&xprt->xpt_list);
1016 WARN_ON_ONCE(!list_empty(&xprt->xpt_ready));
1017 if (test_bit(XPT_TEMP, &xprt->xpt_flags))
1018 serv->sv_tmpcnt--;
1019 spin_unlock_bh(&serv->sv_lock);
1020
1021 while ((dr = svc_deferred_dequeue(xprt)) != NULL)
1022 kfree(dr);
1023
1024 call_xpt_users(xprt);
1025 svc_xprt_put(xprt);
1026}
1027
1028void svc_close_xprt(struct svc_xprt *xprt)
1029{
1030 set_bit(XPT_CLOSE, &xprt->xpt_flags);
1031 if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags))
1032
1033 return;
1034
1035
1036
1037
1038
1039
1040 svc_delete_xprt(xprt);
1041}
1042EXPORT_SYMBOL_GPL(svc_close_xprt);
1043
1044static int svc_close_list(struct svc_serv *serv, struct list_head *xprt_list, struct net *net)
1045{
1046 struct svc_xprt *xprt;
1047 int ret = 0;
1048
1049 spin_lock(&serv->sv_lock);
1050 list_for_each_entry(xprt, xprt_list, xpt_list) {
1051 if (xprt->xpt_net != net)
1052 continue;
1053 ret++;
1054 set_bit(XPT_CLOSE, &xprt->xpt_flags);
1055 svc_xprt_enqueue(xprt);
1056 }
1057 spin_unlock(&serv->sv_lock);
1058 return ret;
1059}
1060
1061static struct svc_xprt *svc_dequeue_net(struct svc_serv *serv, struct net *net)
1062{
1063 struct svc_pool *pool;
1064 struct svc_xprt *xprt;
1065 struct svc_xprt *tmp;
1066 int i;
1067
1068 for (i = 0; i < serv->sv_nrpools; i++) {
1069 pool = &serv->sv_pools[i];
1070
1071 spin_lock_bh(&pool->sp_lock);
1072 list_for_each_entry_safe(xprt, tmp, &pool->sp_sockets, xpt_ready) {
1073 if (xprt->xpt_net != net)
1074 continue;
1075 list_del_init(&xprt->xpt_ready);
1076 spin_unlock_bh(&pool->sp_lock);
1077 return xprt;
1078 }
1079 spin_unlock_bh(&pool->sp_lock);
1080 }
1081 return NULL;
1082}
1083
1084static void svc_clean_up_xprts(struct svc_serv *serv, struct net *net)
1085{
1086 struct svc_xprt *xprt;
1087
1088 while ((xprt = svc_dequeue_net(serv, net))) {
1089 set_bit(XPT_CLOSE, &xprt->xpt_flags);
1090 svc_delete_xprt(xprt);
1091 }
1092}
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106void svc_close_net(struct svc_serv *serv, struct net *net)
1107{
1108 int delay = 0;
1109
1110 while (svc_close_list(serv, &serv->sv_permsocks, net) +
1111 svc_close_list(serv, &serv->sv_tempsocks, net)) {
1112
1113 svc_clean_up_xprts(serv, net);
1114 msleep(delay++);
1115 }
1116}
1117
1118
1119
1120
1121
1122static void svc_revisit(struct cache_deferred_req *dreq, int too_many)
1123{
1124 struct svc_deferred_req *dr =
1125 container_of(dreq, struct svc_deferred_req, handle);
1126 struct svc_xprt *xprt = dr->xprt;
1127
1128 spin_lock(&xprt->xpt_lock);
1129 set_bit(XPT_DEFERRED, &xprt->xpt_flags);
1130 if (too_many || test_bit(XPT_DEAD, &xprt->xpt_flags)) {
1131 spin_unlock(&xprt->xpt_lock);
1132 dprintk("revisit canceled\n");
1133 svc_xprt_put(xprt);
1134 kfree(dr);
1135 return;
1136 }
1137 dprintk("revisit queued\n");
1138 dr->xprt = NULL;
1139 list_add(&dr->handle.recent, &xprt->xpt_deferred);
1140 spin_unlock(&xprt->xpt_lock);
1141 svc_xprt_enqueue(xprt);
1142 svc_xprt_put(xprt);
1143}
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154static struct cache_deferred_req *svc_defer(struct cache_req *req)
1155{
1156 struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle);
1157 struct svc_deferred_req *dr;
1158
1159 if (rqstp->rq_arg.page_len || !test_bit(RQ_USEDEFERRAL, &rqstp->rq_flags))
1160 return NULL;
1161 if (rqstp->rq_deferred) {
1162 dr = rqstp->rq_deferred;
1163 rqstp->rq_deferred = NULL;
1164 } else {
1165 size_t skip;
1166 size_t size;
1167
1168 size = sizeof(struct svc_deferred_req) + rqstp->rq_arg.len;
1169 dr = kmalloc(size, GFP_KERNEL);
1170 if (dr == NULL)
1171 return NULL;
1172
1173 dr->handle.owner = rqstp->rq_server;
1174 dr->prot = rqstp->rq_prot;
1175 memcpy(&dr->addr, &rqstp->rq_addr, rqstp->rq_addrlen);
1176 dr->addrlen = rqstp->rq_addrlen;
1177 dr->daddr = rqstp->rq_daddr;
1178 dr->argslen = rqstp->rq_arg.len >> 2;
1179 dr->xprt_hlen = rqstp->rq_xprt_hlen;
1180
1181
1182 skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1183 memcpy(dr->args, rqstp->rq_arg.head[0].iov_base - skip,
1184 dr->argslen << 2);
1185 }
1186 svc_xprt_get(rqstp->rq_xprt);
1187 dr->xprt = rqstp->rq_xprt;
1188 set_bit(RQ_DROPME, &rqstp->rq_flags);
1189
1190 dr->handle.revisit = svc_revisit;
1191 return &dr->handle;
1192}
1193
1194
1195
1196
1197static int svc_deferred_recv(struct svc_rqst *rqstp)
1198{
1199 struct svc_deferred_req *dr = rqstp->rq_deferred;
1200
1201
1202 rqstp->rq_arg.head[0].iov_base = dr->args + (dr->xprt_hlen>>2);
1203
1204 rqstp->rq_arg.head[0].iov_len = (dr->argslen<<2) - dr->xprt_hlen;
1205 rqstp->rq_arg.page_len = 0;
1206
1207 rqstp->rq_arg.len = dr->argslen<<2;
1208 rqstp->rq_prot = dr->prot;
1209 memcpy(&rqstp->rq_addr, &dr->addr, dr->addrlen);
1210 rqstp->rq_addrlen = dr->addrlen;
1211
1212 rqstp->rq_xprt_hlen = dr->xprt_hlen;
1213 rqstp->rq_daddr = dr->daddr;
1214 rqstp->rq_respages = rqstp->rq_pages;
1215 return (dr->argslen<<2) - dr->xprt_hlen;
1216}
1217
1218
1219static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt)
1220{
1221 struct svc_deferred_req *dr = NULL;
1222
1223 if (!test_bit(XPT_DEFERRED, &xprt->xpt_flags))
1224 return NULL;
1225 spin_lock(&xprt->xpt_lock);
1226 if (!list_empty(&xprt->xpt_deferred)) {
1227 dr = list_entry(xprt->xpt_deferred.next,
1228 struct svc_deferred_req,
1229 handle.recent);
1230 list_del_init(&dr->handle.recent);
1231 } else
1232 clear_bit(XPT_DEFERRED, &xprt->xpt_flags);
1233 spin_unlock(&xprt->xpt_lock);
1234 return dr;
1235}
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
1254 struct net *net, const sa_family_t af,
1255 const unsigned short port)
1256{
1257 struct svc_xprt *xprt;
1258 struct svc_xprt *found = NULL;
1259
1260
1261 if (serv == NULL || xcl_name == NULL)
1262 return found;
1263
1264 spin_lock_bh(&serv->sv_lock);
1265 list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
1266 if (xprt->xpt_net != net)
1267 continue;
1268 if (strcmp(xprt->xpt_class->xcl_name, xcl_name))
1269 continue;
1270 if (af != AF_UNSPEC && af != xprt->xpt_local.ss_family)
1271 continue;
1272 if (port != 0 && port != svc_xprt_local_port(xprt))
1273 continue;
1274 found = xprt;
1275 svc_xprt_get(xprt);
1276 break;
1277 }
1278 spin_unlock_bh(&serv->sv_lock);
1279 return found;
1280}
1281EXPORT_SYMBOL_GPL(svc_find_xprt);
1282
1283static int svc_one_xprt_name(const struct svc_xprt *xprt,
1284 char *pos, int remaining)
1285{
1286 int len;
1287
1288 len = snprintf(pos, remaining, "%s %u\n",
1289 xprt->xpt_class->xcl_name,
1290 svc_xprt_local_port(xprt));
1291 if (len >= remaining)
1292 return -ENAMETOOLONG;
1293 return len;
1294}
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen)
1309{
1310 struct svc_xprt *xprt;
1311 int len, totlen;
1312 char *pos;
1313
1314
1315 if (!serv)
1316 return 0;
1317
1318 spin_lock_bh(&serv->sv_lock);
1319
1320 pos = buf;
1321 totlen = 0;
1322 list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
1323 len = svc_one_xprt_name(xprt, pos, buflen - totlen);
1324 if (len < 0) {
1325 *buf = '\0';
1326 totlen = len;
1327 }
1328 if (len <= 0)
1329 break;
1330
1331 pos += len;
1332 totlen += len;
1333 }
1334
1335 spin_unlock_bh(&serv->sv_lock);
1336 return totlen;
1337}
1338EXPORT_SYMBOL_GPL(svc_xprt_names);
1339
1340
1341
1342
1343static void *svc_pool_stats_start(struct seq_file *m, loff_t *pos)
1344{
1345 unsigned int pidx = (unsigned int)*pos;
1346 struct svc_serv *serv = m->private;
1347
1348 dprintk("svc_pool_stats_start, *pidx=%u\n", pidx);
1349
1350 if (!pidx)
1351 return SEQ_START_TOKEN;
1352 return (pidx > serv->sv_nrpools ? NULL : &serv->sv_pools[pidx-1]);
1353}
1354
1355static void *svc_pool_stats_next(struct seq_file *m, void *p, loff_t *pos)
1356{
1357 struct svc_pool *pool = p;
1358 struct svc_serv *serv = m->private;
1359
1360 dprintk("svc_pool_stats_next, *pos=%llu\n", *pos);
1361
1362 if (p == SEQ_START_TOKEN) {
1363 pool = &serv->sv_pools[0];
1364 } else {
1365 unsigned int pidx = (pool - &serv->sv_pools[0]);
1366 if (pidx < serv->sv_nrpools-1)
1367 pool = &serv->sv_pools[pidx+1];
1368 else
1369 pool = NULL;
1370 }
1371 ++*pos;
1372 return pool;
1373}
1374
1375static void svc_pool_stats_stop(struct seq_file *m, void *p)
1376{
1377}
1378
1379static int svc_pool_stats_show(struct seq_file *m, void *p)
1380{
1381 struct svc_pool *pool = p;
1382
1383 if (p == SEQ_START_TOKEN) {
1384 seq_puts(m, "# pool packets-arrived sockets-enqueued threads-woken threads-timedout\n");
1385 return 0;
1386 }
1387
1388 seq_printf(m, "%u %lu %lu %lu %lu\n",
1389 pool->sp_id,
1390 (unsigned long)atomic_long_read(&pool->sp_stats.packets),
1391 pool->sp_stats.sockets_queued,
1392 (unsigned long)atomic_long_read(&pool->sp_stats.threads_woken),
1393 (unsigned long)atomic_long_read(&pool->sp_stats.threads_timedout));
1394
1395 return 0;
1396}
1397
1398static const struct seq_operations svc_pool_stats_seq_ops = {
1399 .start = svc_pool_stats_start,
1400 .next = svc_pool_stats_next,
1401 .stop = svc_pool_stats_stop,
1402 .show = svc_pool_stats_show,
1403};
1404
1405int svc_pool_stats_open(struct svc_serv *serv, struct file *file)
1406{
1407 int err;
1408
1409 err = seq_open(file, &svc_pool_stats_seq_ops);
1410 if (!err)
1411 ((struct seq_file *) file->private_data)->private = serv;
1412 return err;
1413}
1414EXPORT_SYMBOL(svc_pool_stats_open);
1415
1416
1417