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13#include <linux/linkage.h>
14#include <linux/sched.h>
15#include <linux/errno.h>
16#include <linux/net.h>
17#include <linux/in.h>
18#include <linux/mm.h>
19#include <linux/interrupt.h>
20#include <linux/module.h>
21#include <linux/kthread.h>
22
23#include <linux/sunrpc/types.h>
24#include <linux/sunrpc/xdr.h>
25#include <linux/sunrpc/stats.h>
26#include <linux/sunrpc/svcsock.h>
27#include <linux/sunrpc/clnt.h>
28#include <linux/sunrpc/bc_xprt.h>
29
30#define RPCDBG_FACILITY RPCDBG_SVCDSP
31
32static void svc_unregister(const struct svc_serv *serv);
33
34#define svc_serv_is_pooled(serv) ((serv)->sv_function)
35
36
37
38
39enum {
40 SVC_POOL_AUTO = -1,
41 SVC_POOL_GLOBAL,
42
43 SVC_POOL_PERCPU,
44 SVC_POOL_PERNODE
45};
46#define SVC_POOL_DEFAULT SVC_POOL_GLOBAL
47
48
49
50
51
52static struct svc_pool_map {
53 int count;
54 int mode;
55
56
57 unsigned int npools;
58 unsigned int *pool_to;
59 unsigned int *to_pool;
60} svc_pool_map = {
61 .count = 0,
62 .mode = SVC_POOL_DEFAULT
63};
64static DEFINE_MUTEX(svc_pool_map_mutex);
65
66static int
67param_set_pool_mode(const char *val, struct kernel_param *kp)
68{
69 int *ip = (int *)kp->arg;
70 struct svc_pool_map *m = &svc_pool_map;
71 int err;
72
73 mutex_lock(&svc_pool_map_mutex);
74
75 err = -EBUSY;
76 if (m->count)
77 goto out;
78
79 err = 0;
80 if (!strncmp(val, "auto", 4))
81 *ip = SVC_POOL_AUTO;
82 else if (!strncmp(val, "global", 6))
83 *ip = SVC_POOL_GLOBAL;
84 else if (!strncmp(val, "percpu", 6))
85 *ip = SVC_POOL_PERCPU;
86 else if (!strncmp(val, "pernode", 7))
87 *ip = SVC_POOL_PERNODE;
88 else
89 err = -EINVAL;
90
91out:
92 mutex_unlock(&svc_pool_map_mutex);
93 return err;
94}
95
96static int
97param_get_pool_mode(char *buf, struct kernel_param *kp)
98{
99 int *ip = (int *)kp->arg;
100
101 switch (*ip)
102 {
103 case SVC_POOL_AUTO:
104 return strlcpy(buf, "auto", 20);
105 case SVC_POOL_GLOBAL:
106 return strlcpy(buf, "global", 20);
107 case SVC_POOL_PERCPU:
108 return strlcpy(buf, "percpu", 20);
109 case SVC_POOL_PERNODE:
110 return strlcpy(buf, "pernode", 20);
111 default:
112 return sprintf(buf, "%d", *ip);
113 }
114}
115
116module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode,
117 &svc_pool_map.mode, 0644);
118
119
120
121
122
123static int
124svc_pool_map_choose_mode(void)
125{
126 unsigned int node;
127
128 if (nr_online_nodes > 1) {
129
130
131
132
133 return SVC_POOL_PERNODE;
134 }
135
136 node = any_online_node(node_online_map);
137 if (nr_cpus_node(node) > 2) {
138
139
140
141
142
143
144 return SVC_POOL_PERCPU;
145 }
146
147
148 return SVC_POOL_GLOBAL;
149}
150
151
152
153
154
155static int
156svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools)
157{
158 m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
159 if (!m->to_pool)
160 goto fail;
161 m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
162 if (!m->pool_to)
163 goto fail_free;
164
165 return 0;
166
167fail_free:
168 kfree(m->to_pool);
169fail:
170 return -ENOMEM;
171}
172
173
174
175
176
177static int
178svc_pool_map_init_percpu(struct svc_pool_map *m)
179{
180 unsigned int maxpools = nr_cpu_ids;
181 unsigned int pidx = 0;
182 unsigned int cpu;
183 int err;
184
185 err = svc_pool_map_alloc_arrays(m, maxpools);
186 if (err)
187 return err;
188
189 for_each_online_cpu(cpu) {
190 BUG_ON(pidx > maxpools);
191 m->to_pool[cpu] = pidx;
192 m->pool_to[pidx] = cpu;
193 pidx++;
194 }
195
196
197 return pidx;
198};
199
200
201
202
203
204
205static int
206svc_pool_map_init_pernode(struct svc_pool_map *m)
207{
208 unsigned int maxpools = nr_node_ids;
209 unsigned int pidx = 0;
210 unsigned int node;
211 int err;
212
213 err = svc_pool_map_alloc_arrays(m, maxpools);
214 if (err)
215 return err;
216
217 for_each_node_with_cpus(node) {
218
219 BUG_ON(pidx > maxpools);
220 m->to_pool[node] = pidx;
221 m->pool_to[pidx] = node;
222 pidx++;
223 }
224
225
226 return pidx;
227}
228
229
230
231
232
233
234
235static unsigned int
236svc_pool_map_get(void)
237{
238 struct svc_pool_map *m = &svc_pool_map;
239 int npools = -1;
240
241 mutex_lock(&svc_pool_map_mutex);
242
243 if (m->count++) {
244 mutex_unlock(&svc_pool_map_mutex);
245 return m->npools;
246 }
247
248 if (m->mode == SVC_POOL_AUTO)
249 m->mode = svc_pool_map_choose_mode();
250
251 switch (m->mode) {
252 case SVC_POOL_PERCPU:
253 npools = svc_pool_map_init_percpu(m);
254 break;
255 case SVC_POOL_PERNODE:
256 npools = svc_pool_map_init_pernode(m);
257 break;
258 }
259
260 if (npools < 0) {
261
262 npools = 1;
263 m->mode = SVC_POOL_GLOBAL;
264 }
265 m->npools = npools;
266
267 mutex_unlock(&svc_pool_map_mutex);
268 return m->npools;
269}
270
271
272
273
274
275
276
277
278
279static void
280svc_pool_map_put(void)
281{
282 struct svc_pool_map *m = &svc_pool_map;
283
284 mutex_lock(&svc_pool_map_mutex);
285
286 if (!--m->count) {
287 m->mode = SVC_POOL_DEFAULT;
288 kfree(m->to_pool);
289 kfree(m->pool_to);
290 m->npools = 0;
291 }
292
293 mutex_unlock(&svc_pool_map_mutex);
294}
295
296
297
298
299
300
301static inline void
302svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
303{
304 struct svc_pool_map *m = &svc_pool_map;
305 unsigned int node = m->pool_to[pidx];
306
307
308
309
310
311 BUG_ON(m->count == 0);
312
313 switch (m->mode) {
314 case SVC_POOL_PERCPU:
315 {
316 set_cpus_allowed_ptr(task, cpumask_of(node));
317 break;
318 }
319 case SVC_POOL_PERNODE:
320 {
321 set_cpus_allowed_ptr(task, cpumask_of_node(node));
322 break;
323 }
324 }
325}
326
327
328
329
330
331
332struct svc_pool *
333svc_pool_for_cpu(struct svc_serv *serv, int cpu)
334{
335 struct svc_pool_map *m = &svc_pool_map;
336 unsigned int pidx = 0;
337
338
339
340
341
342
343 if (svc_serv_is_pooled(serv)) {
344 switch (m->mode) {
345 case SVC_POOL_PERCPU:
346 pidx = m->to_pool[cpu];
347 break;
348 case SVC_POOL_PERNODE:
349 pidx = m->to_pool[cpu_to_node(cpu)];
350 break;
351 }
352 }
353 return &serv->sv_pools[pidx % serv->sv_nrpools];
354}
355
356
357
358
359
360static struct svc_serv *
361__svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
362 void (*shutdown)(struct svc_serv *serv))
363{
364 struct svc_serv *serv;
365 unsigned int vers;
366 unsigned int xdrsize;
367 unsigned int i;
368
369 if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
370 return NULL;
371 serv->sv_name = prog->pg_name;
372 serv->sv_program = prog;
373 serv->sv_nrthreads = 1;
374 serv->sv_stats = prog->pg_stats;
375 if (bufsize > RPCSVC_MAXPAYLOAD)
376 bufsize = RPCSVC_MAXPAYLOAD;
377 serv->sv_max_payload = bufsize? bufsize : 4096;
378 serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE);
379 serv->sv_shutdown = shutdown;
380 xdrsize = 0;
381 while (prog) {
382 prog->pg_lovers = prog->pg_nvers-1;
383 for (vers=0; vers<prog->pg_nvers ; vers++)
384 if (prog->pg_vers[vers]) {
385 prog->pg_hivers = vers;
386 if (prog->pg_lovers > vers)
387 prog->pg_lovers = vers;
388 if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
389 xdrsize = prog->pg_vers[vers]->vs_xdrsize;
390 }
391 prog = prog->pg_next;
392 }
393 serv->sv_xdrsize = xdrsize;
394 INIT_LIST_HEAD(&serv->sv_tempsocks);
395 INIT_LIST_HEAD(&serv->sv_permsocks);
396 init_timer(&serv->sv_temptimer);
397 spin_lock_init(&serv->sv_lock);
398
399 serv->sv_nrpools = npools;
400 serv->sv_pools =
401 kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
402 GFP_KERNEL);
403 if (!serv->sv_pools) {
404 kfree(serv);
405 return NULL;
406 }
407
408 for (i = 0; i < serv->sv_nrpools; i++) {
409 struct svc_pool *pool = &serv->sv_pools[i];
410
411 dprintk("svc: initialising pool %u for %s\n",
412 i, serv->sv_name);
413
414 pool->sp_id = i;
415 INIT_LIST_HEAD(&pool->sp_threads);
416 INIT_LIST_HEAD(&pool->sp_sockets);
417 INIT_LIST_HEAD(&pool->sp_all_threads);
418 spin_lock_init(&pool->sp_lock);
419 }
420
421
422 svc_unregister(serv);
423
424 return serv;
425}
426
427struct svc_serv *
428svc_create(struct svc_program *prog, unsigned int bufsize,
429 void (*shutdown)(struct svc_serv *serv))
430{
431 return __svc_create(prog, bufsize, 1, shutdown);
432}
433EXPORT_SYMBOL_GPL(svc_create);
434
435struct svc_serv *
436svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
437 void (*shutdown)(struct svc_serv *serv),
438 svc_thread_fn func, struct module *mod)
439{
440 struct svc_serv *serv;
441 unsigned int npools = svc_pool_map_get();
442
443 serv = __svc_create(prog, bufsize, npools, shutdown);
444
445 if (serv != NULL) {
446 serv->sv_function = func;
447 serv->sv_module = mod;
448 }
449
450 return serv;
451}
452EXPORT_SYMBOL_GPL(svc_create_pooled);
453
454
455
456
457
458void
459svc_destroy(struct svc_serv *serv)
460{
461 dprintk("svc: svc_destroy(%s, %d)\n",
462 serv->sv_program->pg_name,
463 serv->sv_nrthreads);
464
465 if (serv->sv_nrthreads) {
466 if (--(serv->sv_nrthreads) != 0) {
467 svc_sock_update_bufs(serv);
468 return;
469 }
470 } else
471 printk("svc_destroy: no threads for serv=%p!\n", serv);
472
473 del_timer_sync(&serv->sv_temptimer);
474
475 svc_close_all(&serv->sv_tempsocks);
476
477 if (serv->sv_shutdown)
478 serv->sv_shutdown(serv);
479
480 svc_close_all(&serv->sv_permsocks);
481
482 BUG_ON(!list_empty(&serv->sv_permsocks));
483 BUG_ON(!list_empty(&serv->sv_tempsocks));
484
485 cache_clean_deferred(serv);
486
487 if (svc_serv_is_pooled(serv))
488 svc_pool_map_put();
489
490#if defined(CONFIG_NFS_V4_1)
491 svc_sock_destroy(serv->bc_xprt);
492#endif
493
494 svc_unregister(serv);
495 kfree(serv->sv_pools);
496 kfree(serv);
497}
498EXPORT_SYMBOL_GPL(svc_destroy);
499
500
501
502
503
504static int
505svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
506{
507 unsigned int pages, arghi;
508
509 pages = size / PAGE_SIZE + 1;
510
511
512 arghi = 0;
513 BUG_ON(pages > RPCSVC_MAXPAGES);
514 while (pages) {
515 struct page *p = alloc_page(GFP_KERNEL);
516 if (!p)
517 break;
518 rqstp->rq_pages[arghi++] = p;
519 pages--;
520 }
521 return pages == 0;
522}
523
524
525
526
527static void
528svc_release_buffer(struct svc_rqst *rqstp)
529{
530 unsigned int i;
531
532 for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++)
533 if (rqstp->rq_pages[i])
534 put_page(rqstp->rq_pages[i]);
535}
536
537struct svc_rqst *
538svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool)
539{
540 struct svc_rqst *rqstp;
541
542 rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL);
543 if (!rqstp)
544 goto out_enomem;
545
546 init_waitqueue_head(&rqstp->rq_wait);
547
548 serv->sv_nrthreads++;
549 spin_lock_bh(&pool->sp_lock);
550 pool->sp_nrthreads++;
551 list_add(&rqstp->rq_all, &pool->sp_all_threads);
552 spin_unlock_bh(&pool->sp_lock);
553 rqstp->rq_server = serv;
554 rqstp->rq_pool = pool;
555
556 rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
557 if (!rqstp->rq_argp)
558 goto out_thread;
559
560 rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
561 if (!rqstp->rq_resp)
562 goto out_thread;
563
564 if (!svc_init_buffer(rqstp, serv->sv_max_mesg))
565 goto out_thread;
566
567 return rqstp;
568out_thread:
569 svc_exit_thread(rqstp);
570out_enomem:
571 return ERR_PTR(-ENOMEM);
572}
573EXPORT_SYMBOL_GPL(svc_prepare_thread);
574
575
576
577
578static inline struct svc_pool *
579choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
580{
581 if (pool != NULL)
582 return pool;
583
584 return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
585}
586
587
588
589
590static inline struct task_struct *
591choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
592{
593 unsigned int i;
594 struct task_struct *task = NULL;
595
596 if (pool != NULL) {
597 spin_lock_bh(&pool->sp_lock);
598 } else {
599
600 for (i = 0; i < serv->sv_nrpools; i++) {
601 pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
602 spin_lock_bh(&pool->sp_lock);
603 if (!list_empty(&pool->sp_all_threads))
604 goto found_pool;
605 spin_unlock_bh(&pool->sp_lock);
606 }
607 return NULL;
608 }
609
610found_pool:
611 if (!list_empty(&pool->sp_all_threads)) {
612 struct svc_rqst *rqstp;
613
614
615
616
617
618 rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all);
619 list_del_init(&rqstp->rq_all);
620 task = rqstp->rq_task;
621 }
622 spin_unlock_bh(&pool->sp_lock);
623
624 return task;
625}
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641int
642svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
643{
644 struct svc_rqst *rqstp;
645 struct task_struct *task;
646 struct svc_pool *chosen_pool;
647 int error = 0;
648 unsigned int state = serv->sv_nrthreads-1;
649
650 if (pool == NULL) {
651
652 nrservs -= (serv->sv_nrthreads-1);
653 } else {
654 spin_lock_bh(&pool->sp_lock);
655 nrservs -= pool->sp_nrthreads;
656 spin_unlock_bh(&pool->sp_lock);
657 }
658
659
660 while (nrservs > 0) {
661 nrservs--;
662 chosen_pool = choose_pool(serv, pool, &state);
663
664 rqstp = svc_prepare_thread(serv, chosen_pool);
665 if (IS_ERR(rqstp)) {
666 error = PTR_ERR(rqstp);
667 break;
668 }
669
670 __module_get(serv->sv_module);
671 task = kthread_create(serv->sv_function, rqstp, serv->sv_name);
672 if (IS_ERR(task)) {
673 error = PTR_ERR(task);
674 module_put(serv->sv_module);
675 svc_exit_thread(rqstp);
676 break;
677 }
678
679 rqstp->rq_task = task;
680 if (serv->sv_nrpools > 1)
681 svc_pool_map_set_cpumask(task, chosen_pool->sp_id);
682
683 svc_sock_update_bufs(serv);
684 wake_up_process(task);
685 }
686
687 while (nrservs < 0 &&
688 (task = choose_victim(serv, pool, &state)) != NULL) {
689 send_sig(SIGINT, task, 1);
690 nrservs++;
691 }
692
693 return error;
694}
695EXPORT_SYMBOL_GPL(svc_set_num_threads);
696
697
698
699
700
701void
702svc_exit_thread(struct svc_rqst *rqstp)
703{
704 struct svc_serv *serv = rqstp->rq_server;
705 struct svc_pool *pool = rqstp->rq_pool;
706
707 svc_release_buffer(rqstp);
708 kfree(rqstp->rq_resp);
709 kfree(rqstp->rq_argp);
710 kfree(rqstp->rq_auth_data);
711
712 spin_lock_bh(&pool->sp_lock);
713 pool->sp_nrthreads--;
714 list_del(&rqstp->rq_all);
715 spin_unlock_bh(&pool->sp_lock);
716
717 kfree(rqstp);
718
719
720 if (serv)
721 svc_destroy(serv);
722}
723EXPORT_SYMBOL_GPL(svc_exit_thread);
724
725
726
727
728
729
730
731
732
733
734
735static int __svc_rpcb_register4(const u32 program, const u32 version,
736 const unsigned short protocol,
737 const unsigned short port)
738{
739 const struct sockaddr_in sin = {
740 .sin_family = AF_INET,
741 .sin_addr.s_addr = htonl(INADDR_ANY),
742 .sin_port = htons(port),
743 };
744 const char *netid;
745 int error;
746
747 switch (protocol) {
748 case IPPROTO_UDP:
749 netid = RPCBIND_NETID_UDP;
750 break;
751 case IPPROTO_TCP:
752 netid = RPCBIND_NETID_TCP;
753 break;
754 default:
755 return -ENOPROTOOPT;
756 }
757
758 error = rpcb_v4_register(program, version,
759 (const struct sockaddr *)&sin, netid);
760
761
762
763
764
765 if (error == -EPROTONOSUPPORT)
766 error = rpcb_register(program, version, protocol, port);
767
768 return error;
769}
770
771#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
772
773
774
775
776
777
778
779
780
781
782static int __svc_rpcb_register6(const u32 program, const u32 version,
783 const unsigned short protocol,
784 const unsigned short port)
785{
786 const struct sockaddr_in6 sin6 = {
787 .sin6_family = AF_INET6,
788 .sin6_addr = IN6ADDR_ANY_INIT,
789 .sin6_port = htons(port),
790 };
791 const char *netid;
792 int error;
793
794 switch (protocol) {
795 case IPPROTO_UDP:
796 netid = RPCBIND_NETID_UDP6;
797 break;
798 case IPPROTO_TCP:
799 netid = RPCBIND_NETID_TCP6;
800 break;
801 default:
802 return -ENOPROTOOPT;
803 }
804
805 error = rpcb_v4_register(program, version,
806 (const struct sockaddr *)&sin6, netid);
807
808
809
810
811
812 if (error == -EPROTONOSUPPORT)
813 error = -EAFNOSUPPORT;
814
815 return error;
816}
817#endif
818
819
820
821
822
823
824
825static int __svc_register(const char *progname,
826 const u32 program, const u32 version,
827 const int family,
828 const unsigned short protocol,
829 const unsigned short port)
830{
831 int error = -EAFNOSUPPORT;
832
833 switch (family) {
834 case PF_INET:
835 error = __svc_rpcb_register4(program, version,
836 protocol, port);
837 break;
838#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
839 case PF_INET6:
840 error = __svc_rpcb_register6(program, version,
841 protocol, port);
842#endif
843 }
844
845 if (error < 0)
846 printk(KERN_WARNING "svc: failed to register %sv%u RPC "
847 "service (errno %d).\n", progname, version, -error);
848 return error;
849}
850
851
852
853
854
855
856
857
858
859
860int svc_register(const struct svc_serv *serv, const int family,
861 const unsigned short proto, const unsigned short port)
862{
863 struct svc_program *progp;
864 unsigned int i;
865 int error = 0;
866
867 BUG_ON(proto == 0 && port == 0);
868
869 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
870 for (i = 0; i < progp->pg_nvers; i++) {
871 if (progp->pg_vers[i] == NULL)
872 continue;
873
874 dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n",
875 progp->pg_name,
876 i,
877 proto == IPPROTO_UDP? "udp" : "tcp",
878 port,
879 family,
880 progp->pg_vers[i]->vs_hidden?
881 " (but not telling portmap)" : "");
882
883 if (progp->pg_vers[i]->vs_hidden)
884 continue;
885
886 error = __svc_register(progp->pg_name, progp->pg_prog,
887 i, family, proto, port);
888 if (error < 0)
889 break;
890 }
891 }
892
893 return error;
894}
895
896
897
898
899
900
901
902
903static void __svc_unregister(const u32 program, const u32 version,
904 const char *progname)
905{
906 int error;
907
908 error = rpcb_v4_register(program, version, NULL, "");
909
910
911
912
913
914 if (error == -EPROTONOSUPPORT)
915 error = rpcb_register(program, version, 0, 0);
916
917 dprintk("svc: %s(%sv%u), error %d\n",
918 __func__, progname, version, error);
919}
920
921
922
923
924
925
926
927
928
929static void svc_unregister(const struct svc_serv *serv)
930{
931 struct svc_program *progp;
932 unsigned long flags;
933 unsigned int i;
934
935 clear_thread_flag(TIF_SIGPENDING);
936
937 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
938 for (i = 0; i < progp->pg_nvers; i++) {
939 if (progp->pg_vers[i] == NULL)
940 continue;
941 if (progp->pg_vers[i]->vs_hidden)
942 continue;
943
944 __svc_unregister(progp->pg_prog, i, progp->pg_name);
945 }
946 }
947
948 spin_lock_irqsave(¤t->sighand->siglock, flags);
949 recalc_sigpending();
950 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
951}
952
953
954
955
956static int
957__attribute__ ((format (printf, 2, 3)))
958svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
959{
960 va_list args;
961 int r;
962 char buf[RPC_MAX_ADDRBUFLEN];
963
964 if (!net_ratelimit())
965 return 0;
966
967 printk(KERN_WARNING "svc: %s: ",
968 svc_print_addr(rqstp, buf, sizeof(buf)));
969
970 va_start(args, fmt);
971 r = vprintk(fmt, args);
972 va_end(args);
973
974 return r;
975}
976
977
978
979
980static int
981svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
982{
983 struct svc_program *progp;
984 struct svc_version *versp = NULL;
985 struct svc_procedure *procp = NULL;
986 struct svc_serv *serv = rqstp->rq_server;
987 kxdrproc_t xdr;
988 __be32 *statp;
989 u32 prog, vers, proc;
990 __be32 auth_stat, rpc_stat;
991 int auth_res;
992 __be32 *reply_statp;
993
994 rpc_stat = rpc_success;
995
996 if (argv->iov_len < 6*4)
997 goto err_short_len;
998
999
1000 rqstp->rq_splice_ok = 1;
1001
1002 rqstp->rq_usedeferral = 1;
1003
1004
1005 rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
1006
1007 svc_putu32(resv, rqstp->rq_xid);
1008
1009 vers = svc_getnl(argv);
1010
1011
1012 svc_putnl(resv, 1);
1013
1014 if (vers != 2)
1015 goto err_bad_rpc;
1016
1017
1018 reply_statp = resv->iov_base + resv->iov_len;
1019
1020 svc_putnl(resv, 0);
1021
1022 rqstp->rq_prog = prog = svc_getnl(argv);
1023 rqstp->rq_vers = vers = svc_getnl(argv);
1024 rqstp->rq_proc = proc = svc_getnl(argv);
1025
1026 progp = serv->sv_program;
1027
1028 for (progp = serv->sv_program; progp; progp = progp->pg_next)
1029 if (prog == progp->pg_prog)
1030 break;
1031
1032
1033
1034
1035
1036
1037 auth_res = svc_authenticate(rqstp, &auth_stat);
1038
1039 if (auth_res == SVC_OK && progp) {
1040 auth_stat = rpc_autherr_badcred;
1041 auth_res = progp->pg_authenticate(rqstp);
1042 }
1043 switch (auth_res) {
1044 case SVC_OK:
1045 break;
1046 case SVC_GARBAGE:
1047 goto err_garbage;
1048 case SVC_SYSERR:
1049 rpc_stat = rpc_system_err;
1050 goto err_bad;
1051 case SVC_DENIED:
1052 goto err_bad_auth;
1053 case SVC_DROP:
1054 goto dropit;
1055 case SVC_COMPLETE:
1056 goto sendit;
1057 }
1058
1059 if (progp == NULL)
1060 goto err_bad_prog;
1061
1062 if (vers >= progp->pg_nvers ||
1063 !(versp = progp->pg_vers[vers]))
1064 goto err_bad_vers;
1065
1066 procp = versp->vs_proc + proc;
1067 if (proc >= versp->vs_nproc || !procp->pc_func)
1068 goto err_bad_proc;
1069 rqstp->rq_procinfo = procp;
1070
1071
1072 serv->sv_stats->rpccnt++;
1073
1074
1075 statp = resv->iov_base +resv->iov_len;
1076 svc_putnl(resv, RPC_SUCCESS);
1077
1078
1079 procp->pc_count++;
1080
1081
1082 memset(rqstp->rq_argp, 0, procp->pc_argsize);
1083 memset(rqstp->rq_resp, 0, procp->pc_ressize);
1084
1085
1086
1087
1088 if (procp->pc_xdrressize)
1089 svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
1090
1091
1092 if (!versp->vs_dispatch) {
1093
1094 xdr = procp->pc_decode;
1095 if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
1096 goto err_garbage;
1097
1098 *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
1099
1100
1101 if (*statp == rpc_drop_reply) {
1102 if (procp->pc_release)
1103 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1104 goto dropit;
1105 }
1106 if (*statp == rpc_success && (xdr = procp->pc_encode)
1107 && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
1108 dprintk("svc: failed to encode reply\n");
1109
1110 *statp = rpc_system_err;
1111 }
1112 } else {
1113 dprintk("svc: calling dispatcher\n");
1114 if (!versp->vs_dispatch(rqstp, statp)) {
1115
1116 if (procp->pc_release)
1117 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1118 goto dropit;
1119 }
1120 }
1121
1122
1123 if (*statp != rpc_success)
1124 resv->iov_len = ((void*)statp) - resv->iov_base + 4;
1125
1126
1127 if (procp->pc_release)
1128 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1129
1130 if (procp->pc_encode == NULL)
1131 goto dropit;
1132
1133 sendit:
1134 if (svc_authorise(rqstp))
1135 goto dropit;
1136 return 1;
1137
1138 dropit:
1139 svc_authorise(rqstp);
1140 dprintk("svc: svc_process dropit\n");
1141 svc_drop(rqstp);
1142 return 0;
1143
1144err_short_len:
1145 svc_printk(rqstp, "short len %Zd, dropping request\n",
1146 argv->iov_len);
1147
1148 goto dropit;
1149
1150err_bad_rpc:
1151 serv->sv_stats->rpcbadfmt++;
1152 svc_putnl(resv, 1);
1153 svc_putnl(resv, 0);
1154 svc_putnl(resv, 2);
1155 svc_putnl(resv, 2);
1156 goto sendit;
1157
1158err_bad_auth:
1159 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
1160 serv->sv_stats->rpcbadauth++;
1161
1162 xdr_ressize_check(rqstp, reply_statp);
1163 svc_putnl(resv, 1);
1164 svc_putnl(resv, 1);
1165 svc_putnl(resv, ntohl(auth_stat));
1166 goto sendit;
1167
1168err_bad_prog:
1169 dprintk("svc: unknown program %d\n", prog);
1170 serv->sv_stats->rpcbadfmt++;
1171 svc_putnl(resv, RPC_PROG_UNAVAIL);
1172 goto sendit;
1173
1174err_bad_vers:
1175 svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
1176 vers, prog, progp->pg_name);
1177
1178 serv->sv_stats->rpcbadfmt++;
1179 svc_putnl(resv, RPC_PROG_MISMATCH);
1180 svc_putnl(resv, progp->pg_lovers);
1181 svc_putnl(resv, progp->pg_hivers);
1182 goto sendit;
1183
1184err_bad_proc:
1185 svc_printk(rqstp, "unknown procedure (%d)\n", proc);
1186
1187 serv->sv_stats->rpcbadfmt++;
1188 svc_putnl(resv, RPC_PROC_UNAVAIL);
1189 goto sendit;
1190
1191err_garbage:
1192 svc_printk(rqstp, "failed to decode args\n");
1193
1194 rpc_stat = rpc_garbage_args;
1195err_bad:
1196 serv->sv_stats->rpcbadfmt++;
1197 svc_putnl(resv, ntohl(rpc_stat));
1198 goto sendit;
1199}
1200EXPORT_SYMBOL_GPL(svc_process);
1201
1202
1203
1204
1205int
1206svc_process(struct svc_rqst *rqstp)
1207{
1208 struct kvec *argv = &rqstp->rq_arg.head[0];
1209 struct kvec *resv = &rqstp->rq_res.head[0];
1210 struct svc_serv *serv = rqstp->rq_server;
1211 u32 dir;
1212 int error;
1213
1214
1215
1216
1217
1218 rqstp->rq_resused = 1;
1219 resv->iov_base = page_address(rqstp->rq_respages[0]);
1220 resv->iov_len = 0;
1221 rqstp->rq_res.pages = rqstp->rq_respages + 1;
1222 rqstp->rq_res.len = 0;
1223 rqstp->rq_res.page_base = 0;
1224 rqstp->rq_res.page_len = 0;
1225 rqstp->rq_res.buflen = PAGE_SIZE;
1226 rqstp->rq_res.tail[0].iov_base = NULL;
1227 rqstp->rq_res.tail[0].iov_len = 0;
1228
1229 rqstp->rq_xid = svc_getu32(argv);
1230
1231 dir = svc_getnl(argv);
1232 if (dir != 0) {
1233
1234 svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
1235 serv->sv_stats->rpcbadfmt++;
1236 svc_drop(rqstp);
1237 return 0;
1238 }
1239
1240 error = svc_process_common(rqstp, argv, resv);
1241 if (error <= 0)
1242 return error;
1243
1244 return svc_send(rqstp);
1245}
1246
1247#if defined(CONFIG_NFS_V4_1)
1248
1249
1250
1251
1252int
1253bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req,
1254 struct svc_rqst *rqstp)
1255{
1256 struct kvec *argv = &rqstp->rq_arg.head[0];
1257 struct kvec *resv = &rqstp->rq_res.head[0];
1258 int error;
1259
1260
1261 rqstp->rq_xprt = serv->bc_xprt;
1262 rqstp->rq_xid = req->rq_xid;
1263 rqstp->rq_prot = req->rq_xprt->prot;
1264 rqstp->rq_server = serv;
1265
1266 rqstp->rq_addrlen = sizeof(req->rq_xprt->addr);
1267 memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen);
1268 memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg));
1269 memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res));
1270
1271
1272 resv->iov_len = 0;
1273
1274 if (rqstp->rq_prot != IPPROTO_TCP) {
1275 printk(KERN_ERR "No support for Non-TCP transports!\n");
1276 BUG();
1277 }
1278
1279
1280
1281
1282
1283 svc_getu32(argv);
1284 svc_getnl(argv);
1285
1286 error = svc_process_common(rqstp, argv, resv);
1287 if (error <= 0)
1288 return error;
1289
1290 memcpy(&req->rq_snd_buf, &rqstp->rq_res, sizeof(req->rq_snd_buf));
1291 return bc_send(req);
1292}
1293EXPORT_SYMBOL(bc_svc_process);
1294#endif
1295
1296
1297
1298
1299u32 svc_max_payload(const struct svc_rqst *rqstp)
1300{
1301 u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
1302
1303 if (rqstp->rq_server->sv_max_payload < max)
1304 max = rqstp->rq_server->sv_max_payload;
1305 return max;
1306}
1307EXPORT_SYMBOL_GPL(svc_max_payload);
1308