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Linux/net/sunrpc/svc.c

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  1 /*
  2  * linux/net/sunrpc/svc.c
  3  *
  4  * High-level RPC service routines
  5  *
  6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  7  *
  8  * Multiple threads pools and NUMAisation
  9  * Copyright (c) 2006 Silicon Graphics, Inc.
 10  * by Greg Banks <gnb@melbourne.sgi.com>
 11  */
 12 
 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 #include <linux/slab.h>
 23 
 24 #include <linux/sunrpc/types.h>
 25 #include <linux/sunrpc/xdr.h>
 26 #include <linux/sunrpc/stats.h>
 27 #include <linux/sunrpc/svcsock.h>
 28 #include <linux/sunrpc/clnt.h>
 29 #include <linux/sunrpc/bc_xprt.h>
 30 
 31 #define RPCDBG_FACILITY RPCDBG_SVCDSP
 32 
 33 static void svc_unregister(const struct svc_serv *serv);
 34 
 35 #define svc_serv_is_pooled(serv)    ((serv)->sv_function)
 36 
 37 /*
 38  * Mode for mapping cpus to pools.
 39  */
 40 enum {
 41         SVC_POOL_AUTO = -1,     /* choose one of the others */
 42         SVC_POOL_GLOBAL,        /* no mapping, just a single global pool
 43                                  * (legacy & UP mode) */
 44         SVC_POOL_PERCPU,        /* one pool per cpu */
 45         SVC_POOL_PERNODE        /* one pool per numa node */
 46 };
 47 #define SVC_POOL_DEFAULT        SVC_POOL_GLOBAL
 48 
 49 /*
 50  * Structure for mapping cpus to pools and vice versa.
 51  * Setup once during sunrpc initialisation.
 52  */
 53 static struct svc_pool_map {
 54         int count;                      /* How many svc_servs use us */
 55         int mode;                       /* Note: int not enum to avoid
 56                                          * warnings about "enumeration value
 57                                          * not handled in switch" */
 58         unsigned int npools;
 59         unsigned int *pool_to;          /* maps pool id to cpu or node */
 60         unsigned int *to_pool;          /* maps cpu or node to pool id */
 61 } svc_pool_map = {
 62         .count = 0,
 63         .mode = SVC_POOL_DEFAULT
 64 };
 65 static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */
 66 
 67 static int
 68 param_set_pool_mode(const char *val, struct kernel_param *kp)
 69 {
 70         int *ip = (int *)kp->arg;
 71         struct svc_pool_map *m = &svc_pool_map;
 72         int err;
 73 
 74         mutex_lock(&svc_pool_map_mutex);
 75 
 76         err = -EBUSY;
 77         if (m->count)
 78                 goto out;
 79 
 80         err = 0;
 81         if (!strncmp(val, "auto", 4))
 82                 *ip = SVC_POOL_AUTO;
 83         else if (!strncmp(val, "global", 6))
 84                 *ip = SVC_POOL_GLOBAL;
 85         else if (!strncmp(val, "percpu", 6))
 86                 *ip = SVC_POOL_PERCPU;
 87         else if (!strncmp(val, "pernode", 7))
 88                 *ip = SVC_POOL_PERNODE;
 89         else
 90                 err = -EINVAL;
 91 
 92 out:
 93         mutex_unlock(&svc_pool_map_mutex);
 94         return err;
 95 }
 96 
 97 static int
 98 param_get_pool_mode(char *buf, struct kernel_param *kp)
 99 {
100         int *ip = (int *)kp->arg;
101 
102         switch (*ip)
103         {
104         case SVC_POOL_AUTO:
105                 return strlcpy(buf, "auto", 20);
106         case SVC_POOL_GLOBAL:
107                 return strlcpy(buf, "global", 20);
108         case SVC_POOL_PERCPU:
109                 return strlcpy(buf, "percpu", 20);
110         case SVC_POOL_PERNODE:
111                 return strlcpy(buf, "pernode", 20);
112         default:
113                 return sprintf(buf, "%d", *ip);
114         }
115 }
116 
117 module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode,
118                  &svc_pool_map.mode, 0644);
119 
120 /*
121  * Detect best pool mapping mode heuristically,
122  * according to the machine's topology.
123  */
124 static int
125 svc_pool_map_choose_mode(void)
126 {
127         unsigned int node;
128 
129         if (nr_online_nodes > 1) {
130                 /*
131                  * Actually have multiple NUMA nodes,
132                  * so split pools on NUMA node boundaries
133                  */
134                 return SVC_POOL_PERNODE;
135         }
136 
137         node = first_online_node;
138         if (nr_cpus_node(node) > 2) {
139                 /*
140                  * Non-trivial SMP, or CONFIG_NUMA on
141                  * non-NUMA hardware, e.g. with a generic
142                  * x86_64 kernel on Xeons.  In this case we
143                  * want to divide the pools on cpu boundaries.
144                  */
145                 return SVC_POOL_PERCPU;
146         }
147 
148         /* default: one global pool */
149         return SVC_POOL_GLOBAL;
150 }
151 
152 /*
153  * Allocate the to_pool[] and pool_to[] arrays.
154  * Returns 0 on success or an errno.
155  */
156 static int
157 svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools)
158 {
159         m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
160         if (!m->to_pool)
161                 goto fail;
162         m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
163         if (!m->pool_to)
164                 goto fail_free;
165 
166         return 0;
167 
168 fail_free:
169         kfree(m->to_pool);
170         m->to_pool = NULL;
171 fail:
172         return -ENOMEM;
173 }
174 
175 /*
176  * Initialise the pool map for SVC_POOL_PERCPU mode.
177  * Returns number of pools or <0 on error.
178  */
179 static int
180 svc_pool_map_init_percpu(struct svc_pool_map *m)
181 {
182         unsigned int maxpools = nr_cpu_ids;
183         unsigned int pidx = 0;
184         unsigned int cpu;
185         int err;
186 
187         err = svc_pool_map_alloc_arrays(m, maxpools);
188         if (err)
189                 return err;
190 
191         for_each_online_cpu(cpu) {
192                 BUG_ON(pidx > maxpools);
193                 m->to_pool[cpu] = pidx;
194                 m->pool_to[pidx] = cpu;
195                 pidx++;
196         }
197         /* cpus brought online later all get mapped to pool0, sorry */
198 
199         return pidx;
200 };
201 
202 
203 /*
204  * Initialise the pool map for SVC_POOL_PERNODE mode.
205  * Returns number of pools or <0 on error.
206  */
207 static int
208 svc_pool_map_init_pernode(struct svc_pool_map *m)
209 {
210         unsigned int maxpools = nr_node_ids;
211         unsigned int pidx = 0;
212         unsigned int node;
213         int err;
214 
215         err = svc_pool_map_alloc_arrays(m, maxpools);
216         if (err)
217                 return err;
218 
219         for_each_node_with_cpus(node) {
220                 /* some architectures (e.g. SN2) have cpuless nodes */
221                 BUG_ON(pidx > maxpools);
222                 m->to_pool[node] = pidx;
223                 m->pool_to[pidx] = node;
224                 pidx++;
225         }
226         /* nodes brought online later all get mapped to pool0, sorry */
227 
228         return pidx;
229 }
230 
231 
232 /*
233  * Add a reference to the global map of cpus to pools (and
234  * vice versa).  Initialise the map if we're the first user.
235  * Returns the number of pools.
236  */
237 static unsigned int
238 svc_pool_map_get(void)
239 {
240         struct svc_pool_map *m = &svc_pool_map;
241         int npools = -1;
242 
243         mutex_lock(&svc_pool_map_mutex);
244 
245         if (m->count++) {
246                 mutex_unlock(&svc_pool_map_mutex);
247                 return m->npools;
248         }
249 
250         if (m->mode == SVC_POOL_AUTO)
251                 m->mode = svc_pool_map_choose_mode();
252 
253         switch (m->mode) {
254         case SVC_POOL_PERCPU:
255                 npools = svc_pool_map_init_percpu(m);
256                 break;
257         case SVC_POOL_PERNODE:
258                 npools = svc_pool_map_init_pernode(m);
259                 break;
260         }
261 
262         if (npools < 0) {
263                 /* default, or memory allocation failure */
264                 npools = 1;
265                 m->mode = SVC_POOL_GLOBAL;
266         }
267         m->npools = npools;
268 
269         mutex_unlock(&svc_pool_map_mutex);
270         return m->npools;
271 }
272 
273 
274 /*
275  * Drop a reference to the global map of cpus to pools.
276  * When the last reference is dropped, the map data is
277  * freed; this allows the sysadmin to change the pool
278  * mode using the pool_mode module option without
279  * rebooting or re-loading sunrpc.ko.
280  */
281 static void
282 svc_pool_map_put(void)
283 {
284         struct svc_pool_map *m = &svc_pool_map;
285 
286         mutex_lock(&svc_pool_map_mutex);
287 
288         if (!--m->count) {
289                 m->mode = SVC_POOL_DEFAULT;
290                 kfree(m->to_pool);
291                 m->to_pool = NULL;
292                 kfree(m->pool_to);
293                 m->pool_to = NULL;
294                 m->npools = 0;
295         }
296 
297         mutex_unlock(&svc_pool_map_mutex);
298 }
299 
300 
301 /*
302  * Set the given thread's cpus_allowed mask so that it
303  * will only run on cpus in the given pool.
304  */
305 static inline void
306 svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
307 {
308         struct svc_pool_map *m = &svc_pool_map;
309         unsigned int node = m->pool_to[pidx];
310 
311         /*
312          * The caller checks for sv_nrpools > 1, which
313          * implies that we've been initialized.
314          */
315         BUG_ON(m->count == 0);
316 
317         switch (m->mode) {
318         case SVC_POOL_PERCPU:
319         {
320                 set_cpus_allowed_ptr(task, cpumask_of(node));
321                 break;
322         }
323         case SVC_POOL_PERNODE:
324         {
325                 set_cpus_allowed_ptr(task, cpumask_of_node(node));
326                 break;
327         }
328         }
329 }
330 
331 /*
332  * Use the mapping mode to choose a pool for a given CPU.
333  * Used when enqueueing an incoming RPC.  Always returns
334  * a non-NULL pool pointer.
335  */
336 struct svc_pool *
337 svc_pool_for_cpu(struct svc_serv *serv, int cpu)
338 {
339         struct svc_pool_map *m = &svc_pool_map;
340         unsigned int pidx = 0;
341 
342         /*
343          * An uninitialised map happens in a pure client when
344          * lockd is brought up, so silently treat it the
345          * same as SVC_POOL_GLOBAL.
346          */
347         if (svc_serv_is_pooled(serv)) {
348                 switch (m->mode) {
349                 case SVC_POOL_PERCPU:
350                         pidx = m->to_pool[cpu];
351                         break;
352                 case SVC_POOL_PERNODE:
353                         pidx = m->to_pool[cpu_to_node(cpu)];
354                         break;
355                 }
356         }
357         return &serv->sv_pools[pidx % serv->sv_nrpools];
358 }
359 
360 
361 /*
362  * Create an RPC service
363  */
364 static struct svc_serv *
365 __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
366              void (*shutdown)(struct svc_serv *serv))
367 {
368         struct svc_serv *serv;
369         unsigned int vers;
370         unsigned int xdrsize;
371         unsigned int i;
372 
373         if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
374                 return NULL;
375         serv->sv_name      = prog->pg_name;
376         serv->sv_program   = prog;
377         serv->sv_nrthreads = 1;
378         serv->sv_stats     = prog->pg_stats;
379         if (bufsize > RPCSVC_MAXPAYLOAD)
380                 bufsize = RPCSVC_MAXPAYLOAD;
381         serv->sv_max_payload = bufsize? bufsize : 4096;
382         serv->sv_max_mesg  = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE);
383         serv->sv_shutdown  = shutdown;
384         xdrsize = 0;
385         while (prog) {
386                 prog->pg_lovers = prog->pg_nvers-1;
387                 for (vers=0; vers<prog->pg_nvers ; vers++)
388                         if (prog->pg_vers[vers]) {
389                                 prog->pg_hivers = vers;
390                                 if (prog->pg_lovers > vers)
391                                         prog->pg_lovers = vers;
392                                 if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
393                                         xdrsize = prog->pg_vers[vers]->vs_xdrsize;
394                         }
395                 prog = prog->pg_next;
396         }
397         serv->sv_xdrsize   = xdrsize;
398         INIT_LIST_HEAD(&serv->sv_tempsocks);
399         INIT_LIST_HEAD(&serv->sv_permsocks);
400         init_timer(&serv->sv_temptimer);
401         spin_lock_init(&serv->sv_lock);
402 
403         serv->sv_nrpools = npools;
404         serv->sv_pools =
405                 kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
406                         GFP_KERNEL);
407         if (!serv->sv_pools) {
408                 kfree(serv);
409                 return NULL;
410         }
411 
412         for (i = 0; i < serv->sv_nrpools; i++) {
413                 struct svc_pool *pool = &serv->sv_pools[i];
414 
415                 dprintk("svc: initialising pool %u for %s\n",
416                                 i, serv->sv_name);
417 
418                 pool->sp_id = i;
419                 INIT_LIST_HEAD(&pool->sp_threads);
420                 INIT_LIST_HEAD(&pool->sp_sockets);
421                 INIT_LIST_HEAD(&pool->sp_all_threads);
422                 spin_lock_init(&pool->sp_lock);
423         }
424 
425         /* Remove any stale portmap registrations */
426         svc_unregister(serv);
427 
428         return serv;
429 }
430 
431 struct svc_serv *
432 svc_create(struct svc_program *prog, unsigned int bufsize,
433            void (*shutdown)(struct svc_serv *serv))
434 {
435         return __svc_create(prog, bufsize, /*npools*/1, shutdown);
436 }
437 EXPORT_SYMBOL_GPL(svc_create);
438 
439 struct svc_serv *
440 svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
441                   void (*shutdown)(struct svc_serv *serv),
442                   svc_thread_fn func, struct module *mod)
443 {
444         struct svc_serv *serv;
445         unsigned int npools = svc_pool_map_get();
446 
447         serv = __svc_create(prog, bufsize, npools, shutdown);
448 
449         if (serv != NULL) {
450                 serv->sv_function = func;
451                 serv->sv_module = mod;
452         }
453 
454         return serv;
455 }
456 EXPORT_SYMBOL_GPL(svc_create_pooled);
457 
458 /*
459  * Destroy an RPC service. Should be called with appropriate locking to
460  * protect the sv_nrthreads, sv_permsocks and sv_tempsocks.
461  */
462 void
463 svc_destroy(struct svc_serv *serv)
464 {
465         dprintk("svc: svc_destroy(%s, %d)\n",
466                                 serv->sv_program->pg_name,
467                                 serv->sv_nrthreads);
468 
469         if (serv->sv_nrthreads) {
470                 if (--(serv->sv_nrthreads) != 0) {
471                         svc_sock_update_bufs(serv);
472                         return;
473                 }
474         } else
475                 printk("svc_destroy: no threads for serv=%p!\n", serv);
476 
477         del_timer_sync(&serv->sv_temptimer);
478         /*
479          * The set of xprts (contained in the sv_tempsocks and
480          * sv_permsocks lists) is now constant, since it is modified
481          * only by accepting new sockets (done by service threads in
482          * svc_recv) or aging old ones (done by sv_temptimer), or
483          * configuration changes (excluded by whatever locking the
484          * caller is using--nfsd_mutex in the case of nfsd).  So it's
485          * safe to traverse those lists and shut everything down:
486          */
487         svc_close_all(serv);
488 
489         if (serv->sv_shutdown)
490                 serv->sv_shutdown(serv);
491 
492         cache_clean_deferred(serv);
493 
494         if (svc_serv_is_pooled(serv))
495                 svc_pool_map_put();
496 
497         svc_unregister(serv);
498         kfree(serv->sv_pools);
499         kfree(serv);
500 }
501 EXPORT_SYMBOL_GPL(svc_destroy);
502 
503 /*
504  * Allocate an RPC server's buffer space.
505  * We allocate pages and place them in rq_argpages.
506  */
507 static int
508 svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
509 {
510         unsigned int pages, arghi;
511 
512         /* bc_xprt uses fore channel allocated buffers */
513         if (svc_is_backchannel(rqstp))
514                 return 1;
515 
516         pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
517                                        * We assume one is at most one page
518                                        */
519         arghi = 0;
520         BUG_ON(pages > RPCSVC_MAXPAGES);
521         while (pages) {
522                 struct page *p = alloc_page(GFP_KERNEL);
523                 if (!p)
524                         break;
525                 rqstp->rq_pages[arghi++] = p;
526                 pages--;
527         }
528         return pages == 0;
529 }
530 
531 /*
532  * Release an RPC server buffer
533  */
534 static void
535 svc_release_buffer(struct svc_rqst *rqstp)
536 {
537         unsigned int i;
538 
539         for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++)
540                 if (rqstp->rq_pages[i])
541                         put_page(rqstp->rq_pages[i]);
542 }
543 
544 struct svc_rqst *
545 svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool)
546 {
547         struct svc_rqst *rqstp;
548 
549         rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL);
550         if (!rqstp)
551                 goto out_enomem;
552 
553         init_waitqueue_head(&rqstp->rq_wait);
554 
555         serv->sv_nrthreads++;
556         spin_lock_bh(&pool->sp_lock);
557         pool->sp_nrthreads++;
558         list_add(&rqstp->rq_all, &pool->sp_all_threads);
559         spin_unlock_bh(&pool->sp_lock);
560         rqstp->rq_server = serv;
561         rqstp->rq_pool = pool;
562 
563         rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
564         if (!rqstp->rq_argp)
565                 goto out_thread;
566 
567         rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
568         if (!rqstp->rq_resp)
569                 goto out_thread;
570 
571         if (!svc_init_buffer(rqstp, serv->sv_max_mesg))
572                 goto out_thread;
573 
574         return rqstp;
575 out_thread:
576         svc_exit_thread(rqstp);
577 out_enomem:
578         return ERR_PTR(-ENOMEM);
579 }
580 EXPORT_SYMBOL_GPL(svc_prepare_thread);
581 
582 /*
583  * Choose a pool in which to create a new thread, for svc_set_num_threads
584  */
585 static inline struct svc_pool *
586 choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
587 {
588         if (pool != NULL)
589                 return pool;
590 
591         return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
592 }
593 
594 /*
595  * Choose a thread to kill, for svc_set_num_threads
596  */
597 static inline struct task_struct *
598 choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
599 {
600         unsigned int i;
601         struct task_struct *task = NULL;
602 
603         if (pool != NULL) {
604                 spin_lock_bh(&pool->sp_lock);
605         } else {
606                 /* choose a pool in round-robin fashion */
607                 for (i = 0; i < serv->sv_nrpools; i++) {
608                         pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
609                         spin_lock_bh(&pool->sp_lock);
610                         if (!list_empty(&pool->sp_all_threads))
611                                 goto found_pool;
612                         spin_unlock_bh(&pool->sp_lock);
613                 }
614                 return NULL;
615         }
616 
617 found_pool:
618         if (!list_empty(&pool->sp_all_threads)) {
619                 struct svc_rqst *rqstp;
620 
621                 /*
622                  * Remove from the pool->sp_all_threads list
623                  * so we don't try to kill it again.
624                  */
625                 rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all);
626                 list_del_init(&rqstp->rq_all);
627                 task = rqstp->rq_task;
628         }
629         spin_unlock_bh(&pool->sp_lock);
630 
631         return task;
632 }
633 
634 /*
635  * Create or destroy enough new threads to make the number
636  * of threads the given number.  If `pool' is non-NULL, applies
637  * only to threads in that pool, otherwise round-robins between
638  * all pools.  Must be called with a svc_get() reference and
639  * the BKL or another lock to protect access to svc_serv fields.
640  *
641  * Destroying threads relies on the service threads filling in
642  * rqstp->rq_task, which only the nfs ones do.  Assumes the serv
643  * has been created using svc_create_pooled().
644  *
645  * Based on code that used to be in nfsd_svc() but tweaked
646  * to be pool-aware.
647  */
648 int
649 svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
650 {
651         struct svc_rqst *rqstp;
652         struct task_struct *task;
653         struct svc_pool *chosen_pool;
654         int error = 0;
655         unsigned int state = serv->sv_nrthreads-1;
656 
657         if (pool == NULL) {
658                 /* The -1 assumes caller has done a svc_get() */
659                 nrservs -= (serv->sv_nrthreads-1);
660         } else {
661                 spin_lock_bh(&pool->sp_lock);
662                 nrservs -= pool->sp_nrthreads;
663                 spin_unlock_bh(&pool->sp_lock);
664         }
665 
666         /* create new threads */
667         while (nrservs > 0) {
668                 nrservs--;
669                 chosen_pool = choose_pool(serv, pool, &state);
670 
671                 rqstp = svc_prepare_thread(serv, chosen_pool);
672                 if (IS_ERR(rqstp)) {
673                         error = PTR_ERR(rqstp);
674                         break;
675                 }
676 
677                 __module_get(serv->sv_module);
678                 task = kthread_create(serv->sv_function, rqstp, serv->sv_name);
679                 if (IS_ERR(task)) {
680                         error = PTR_ERR(task);
681                         module_put(serv->sv_module);
682                         svc_exit_thread(rqstp);
683                         break;
684                 }
685 
686                 rqstp->rq_task = task;
687                 if (serv->sv_nrpools > 1)
688                         svc_pool_map_set_cpumask(task, chosen_pool->sp_id);
689 
690                 svc_sock_update_bufs(serv);
691                 wake_up_process(task);
692         }
693         /* destroy old threads */
694         while (nrservs < 0 &&
695                (task = choose_victim(serv, pool, &state)) != NULL) {
696                 send_sig(SIGINT, task, 1);
697                 nrservs++;
698         }
699 
700         return error;
701 }
702 EXPORT_SYMBOL_GPL(svc_set_num_threads);
703 
704 /*
705  * Called from a server thread as it's exiting. Caller must hold the BKL or
706  * the "service mutex", whichever is appropriate for the service.
707  */
708 void
709 svc_exit_thread(struct svc_rqst *rqstp)
710 {
711         struct svc_serv *serv = rqstp->rq_server;
712         struct svc_pool *pool = rqstp->rq_pool;
713 
714         svc_release_buffer(rqstp);
715         kfree(rqstp->rq_resp);
716         kfree(rqstp->rq_argp);
717         kfree(rqstp->rq_auth_data);
718 
719         spin_lock_bh(&pool->sp_lock);
720         pool->sp_nrthreads--;
721         list_del(&rqstp->rq_all);
722         spin_unlock_bh(&pool->sp_lock);
723 
724         kfree(rqstp);
725 
726         /* Release the server */
727         if (serv)
728                 svc_destroy(serv);
729 }
730 EXPORT_SYMBOL_GPL(svc_exit_thread);
731 
732 /*
733  * Register an "inet" protocol family netid with the local
734  * rpcbind daemon via an rpcbind v4 SET request.
735  *
736  * No netconfig infrastructure is available in the kernel, so
737  * we map IP_ protocol numbers to netids by hand.
738  *
739  * Returns zero on success; a negative errno value is returned
740  * if any error occurs.
741  */
742 static int __svc_rpcb_register4(const u32 program, const u32 version,
743                                 const unsigned short protocol,
744                                 const unsigned short port)
745 {
746         const struct sockaddr_in sin = {
747                 .sin_family             = AF_INET,
748                 .sin_addr.s_addr        = htonl(INADDR_ANY),
749                 .sin_port               = htons(port),
750         };
751         const char *netid;
752         int error;
753 
754         switch (protocol) {
755         case IPPROTO_UDP:
756                 netid = RPCBIND_NETID_UDP;
757                 break;
758         case IPPROTO_TCP:
759                 netid = RPCBIND_NETID_TCP;
760                 break;
761         default:
762                 return -ENOPROTOOPT;
763         }
764 
765         error = rpcb_v4_register(program, version,
766                                         (const struct sockaddr *)&sin, netid);
767 
768         /*
769          * User space didn't support rpcbind v4, so retry this
770          * registration request with the legacy rpcbind v2 protocol.
771          */
772         if (error == -EPROTONOSUPPORT)
773                 error = rpcb_register(program, version, protocol, port);
774 
775         return error;
776 }
777 
778 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
779 /*
780  * Register an "inet6" protocol family netid with the local
781  * rpcbind daemon via an rpcbind v4 SET request.
782  *
783  * No netconfig infrastructure is available in the kernel, so
784  * we map IP_ protocol numbers to netids by hand.
785  *
786  * Returns zero on success; a negative errno value is returned
787  * if any error occurs.
788  */
789 static int __svc_rpcb_register6(const u32 program, const u32 version,
790                                 const unsigned short protocol,
791                                 const unsigned short port)
792 {
793         const struct sockaddr_in6 sin6 = {
794                 .sin6_family            = AF_INET6,
795                 .sin6_addr              = IN6ADDR_ANY_INIT,
796                 .sin6_port              = htons(port),
797         };
798         const char *netid;
799         int error;
800 
801         switch (protocol) {
802         case IPPROTO_UDP:
803                 netid = RPCBIND_NETID_UDP6;
804                 break;
805         case IPPROTO_TCP:
806                 netid = RPCBIND_NETID_TCP6;
807                 break;
808         default:
809                 return -ENOPROTOOPT;
810         }
811 
812         error = rpcb_v4_register(program, version,
813                                         (const struct sockaddr *)&sin6, netid);
814 
815         /*
816          * User space didn't support rpcbind version 4, so we won't
817          * use a PF_INET6 listener.
818          */
819         if (error == -EPROTONOSUPPORT)
820                 error = -EAFNOSUPPORT;
821 
822         return error;
823 }
824 #endif  /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
825 
826 /*
827  * Register a kernel RPC service via rpcbind version 4.
828  *
829  * Returns zero on success; a negative errno value is returned
830  * if any error occurs.
831  */
832 static int __svc_register(const char *progname,
833                           const u32 program, const u32 version,
834                           const int family,
835                           const unsigned short protocol,
836                           const unsigned short port)
837 {
838         int error = -EAFNOSUPPORT;
839 
840         switch (family) {
841         case PF_INET:
842                 error = __svc_rpcb_register4(program, version,
843                                                 protocol, port);
844                 break;
845 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
846         case PF_INET6:
847                 error = __svc_rpcb_register6(program, version,
848                                                 protocol, port);
849 #endif  /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
850         }
851 
852         if (error < 0)
853                 printk(KERN_WARNING "svc: failed to register %sv%u RPC "
854                         "service (errno %d).\n", progname, version, -error);
855         return error;
856 }
857 
858 /**
859  * svc_register - register an RPC service with the local portmapper
860  * @serv: svc_serv struct for the service to register
861  * @family: protocol family of service's listener socket
862  * @proto: transport protocol number to advertise
863  * @port: port to advertise
864  *
865  * Service is registered for any address in the passed-in protocol family
866  */
867 int svc_register(const struct svc_serv *serv, const int family,
868                  const unsigned short proto, const unsigned short port)
869 {
870         struct svc_program      *progp;
871         unsigned int            i;
872         int                     error = 0;
873 
874         BUG_ON(proto == 0 && port == 0);
875 
876         for (progp = serv->sv_program; progp; progp = progp->pg_next) {
877                 for (i = 0; i < progp->pg_nvers; i++) {
878                         if (progp->pg_vers[i] == NULL)
879                                 continue;
880 
881                         dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n",
882                                         progp->pg_name,
883                                         i,
884                                         proto == IPPROTO_UDP?  "udp" : "tcp",
885                                         port,
886                                         family,
887                                         progp->pg_vers[i]->vs_hidden?
888                                                 " (but not telling portmap)" : "");
889 
890                         if (progp->pg_vers[i]->vs_hidden)
891                                 continue;
892 
893                         error = __svc_register(progp->pg_name, progp->pg_prog,
894                                                 i, family, proto, port);
895                         if (error < 0)
896                                 break;
897                 }
898         }
899 
900         return error;
901 }
902 
903 /*
904  * If user space is running rpcbind, it should take the v4 UNSET
905  * and clear everything for this [program, version].  If user space
906  * is running portmap, it will reject the v4 UNSET, but won't have
907  * any "inet6" entries anyway.  So a PMAP_UNSET should be sufficient
908  * in this case to clear all existing entries for [program, version].
909  */
910 static void __svc_unregister(const u32 program, const u32 version,
911                              const char *progname)
912 {
913         int error;
914 
915         error = rpcb_v4_register(program, version, NULL, "");
916 
917         /*
918          * User space didn't support rpcbind v4, so retry this
919          * request with the legacy rpcbind v2 protocol.
920          */
921         if (error == -EPROTONOSUPPORT)
922                 error = rpcb_register(program, version, 0, 0);
923 
924         dprintk("svc: %s(%sv%u), error %d\n",
925                         __func__, progname, version, error);
926 }
927 
928 /*
929  * All netids, bind addresses and ports registered for [program, version]
930  * are removed from the local rpcbind database (if the service is not
931  * hidden) to make way for a new instance of the service.
932  *
933  * The result of unregistration is reported via dprintk for those who want
934  * verification of the result, but is otherwise not important.
935  */
936 static void svc_unregister(const struct svc_serv *serv)
937 {
938         struct svc_program *progp;
939         unsigned long flags;
940         unsigned int i;
941 
942         clear_thread_flag(TIF_SIGPENDING);
943 
944         for (progp = serv->sv_program; progp; progp = progp->pg_next) {
945                 for (i = 0; i < progp->pg_nvers; i++) {
946                         if (progp->pg_vers[i] == NULL)
947                                 continue;
948                         if (progp->pg_vers[i]->vs_hidden)
949                                 continue;
950 
951                         dprintk("svc: attempting to unregister %sv%u\n",
952                                 progp->pg_name, i);
953                         __svc_unregister(progp->pg_prog, i, progp->pg_name);
954                 }
955         }
956 
957         spin_lock_irqsave(&current->sighand->siglock, flags);
958         recalc_sigpending();
959         spin_unlock_irqrestore(&current->sighand->siglock, flags);
960 }
961 
962 /*
963  * Printk the given error with the address of the client that caused it.
964  */
965 static int
966 __attribute__ ((format (printf, 2, 3)))
967 svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
968 {
969         va_list args;
970         int     r;
971         char    buf[RPC_MAX_ADDRBUFLEN];
972 
973         if (!net_ratelimit())
974                 return 0;
975 
976         printk(KERN_WARNING "svc: %s: ",
977                 svc_print_addr(rqstp, buf, sizeof(buf)));
978 
979         va_start(args, fmt);
980         r = vprintk(fmt, args);
981         va_end(args);
982 
983         return r;
984 }
985 
986 /*
987  * Common routine for processing the RPC request.
988  */
989 static int
990 svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
991 {
992         struct svc_program      *progp;
993         struct svc_version      *versp = NULL;  /* compiler food */
994         struct svc_procedure    *procp = NULL;
995         struct svc_serv         *serv = rqstp->rq_server;
996         kxdrproc_t              xdr;
997         __be32                  *statp;
998         u32                     prog, vers, proc;
999         __be32                  auth_stat, rpc_stat;
1000         int                     auth_res;
1001         __be32                  *reply_statp;
1002 
1003         rpc_stat = rpc_success;
1004 
1005         if (argv->iov_len < 6*4)
1006                 goto err_short_len;
1007 
1008         /* Will be turned off only in gss privacy case: */
1009         rqstp->rq_splice_ok = 1;
1010         /* Will be turned off only when NFSv4 Sessions are used */
1011         rqstp->rq_usedeferral = 1;
1012         rqstp->rq_dropme = false;
1013 
1014         /* Setup reply header */
1015         rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
1016 
1017         svc_putu32(resv, rqstp->rq_xid);
1018 
1019         vers = svc_getnl(argv);
1020 
1021         /* First words of reply: */
1022         svc_putnl(resv, 1);             /* REPLY */
1023 
1024         if (vers != 2)          /* RPC version number */
1025                 goto err_bad_rpc;
1026 
1027         /* Save position in case we later decide to reject: */
1028         reply_statp = resv->iov_base + resv->iov_len;
1029 
1030         svc_putnl(resv, 0);             /* ACCEPT */
1031 
1032         rqstp->rq_prog = prog = svc_getnl(argv);        /* program number */
1033         rqstp->rq_vers = vers = svc_getnl(argv);        /* version number */
1034         rqstp->rq_proc = proc = svc_getnl(argv);        /* procedure number */
1035 
1036         progp = serv->sv_program;
1037 
1038         for (progp = serv->sv_program; progp; progp = progp->pg_next)
1039                 if (prog == progp->pg_prog)
1040                         break;
1041 
1042         /*
1043          * Decode auth data, and add verifier to reply buffer.
1044          * We do this before anything else in order to get a decent
1045          * auth verifier.
1046          */
1047         auth_res = svc_authenticate(rqstp, &auth_stat);
1048         /* Also give the program a chance to reject this call: */
1049         if (auth_res == SVC_OK && progp) {
1050                 auth_stat = rpc_autherr_badcred;
1051                 auth_res = progp->pg_authenticate(rqstp);
1052         }
1053         switch (auth_res) {
1054         case SVC_OK:
1055                 break;
1056         case SVC_GARBAGE:
1057                 goto err_garbage;
1058         case SVC_SYSERR:
1059                 rpc_stat = rpc_system_err;
1060                 goto err_bad;
1061         case SVC_DENIED:
1062                 goto err_bad_auth;
1063         case SVC_CLOSE:
1064                 if (test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags))
1065                         svc_close_xprt(rqstp->rq_xprt);
1066         case SVC_DROP:
1067                 goto dropit;
1068         case SVC_COMPLETE:
1069                 goto sendit;
1070         }
1071 
1072         if (progp == NULL)
1073                 goto err_bad_prog;
1074 
1075         if (vers >= progp->pg_nvers ||
1076           !(versp = progp->pg_vers[vers]))
1077                 goto err_bad_vers;
1078 
1079         procp = versp->vs_proc + proc;
1080         if (proc >= versp->vs_nproc || !procp->pc_func)
1081                 goto err_bad_proc;
1082         rqstp->rq_procinfo = procp;
1083 
1084         /* Syntactic check complete */
1085         serv->sv_stats->rpccnt++;
1086 
1087         /* Build the reply header. */
1088         statp = resv->iov_base +resv->iov_len;
1089         svc_putnl(resv, RPC_SUCCESS);
1090 
1091         /* Bump per-procedure stats counter */
1092         procp->pc_count++;
1093 
1094         /* Initialize storage for argp and resp */
1095         memset(rqstp->rq_argp, 0, procp->pc_argsize);
1096         memset(rqstp->rq_resp, 0, procp->pc_ressize);
1097 
1098         /* un-reserve some of the out-queue now that we have a
1099          * better idea of reply size
1100          */
1101         if (procp->pc_xdrressize)
1102                 svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
1103 
1104         /* Call the function that processes the request. */
1105         if (!versp->vs_dispatch) {
1106                 /* Decode arguments */
1107                 xdr = procp->pc_decode;
1108                 if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
1109                         goto err_garbage;
1110 
1111                 *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
1112 
1113                 /* Encode reply */
1114                 if (rqstp->rq_dropme) {
1115                         if (procp->pc_release)
1116                                 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1117                         goto dropit;
1118                 }
1119                 if (*statp == rpc_success &&
1120                     (xdr = procp->pc_encode) &&
1121                     !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
1122                         dprintk("svc: failed to encode reply\n");
1123                         /* serv->sv_stats->rpcsystemerr++; */
1124                         *statp = rpc_system_err;
1125                 }
1126         } else {
1127                 dprintk("svc: calling dispatcher\n");
1128                 if (!versp->vs_dispatch(rqstp, statp)) {
1129                         /* Release reply info */
1130                         if (procp->pc_release)
1131                                 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1132                         goto dropit;
1133                 }
1134         }
1135 
1136         /* Check RPC status result */
1137         if (*statp != rpc_success)
1138                 resv->iov_len = ((void*)statp)  - resv->iov_base + 4;
1139 
1140         /* Release reply info */
1141         if (procp->pc_release)
1142                 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1143 
1144         if (procp->pc_encode == NULL)
1145                 goto dropit;
1146 
1147  sendit:
1148         if (svc_authorise(rqstp))
1149                 goto dropit;
1150         return 1;               /* Caller can now send it */
1151 
1152  dropit:
1153         svc_authorise(rqstp);   /* doesn't hurt to call this twice */
1154         dprintk("svc: svc_process dropit\n");
1155         return 0;
1156 
1157 err_short_len:
1158         svc_printk(rqstp, "short len %Zd, dropping request\n",
1159                         argv->iov_len);
1160 
1161         goto dropit;                    /* drop request */
1162 
1163 err_bad_rpc:
1164         serv->sv_stats->rpcbadfmt++;
1165         svc_putnl(resv, 1);     /* REJECT */
1166         svc_putnl(resv, 0);     /* RPC_MISMATCH */
1167         svc_putnl(resv, 2);     /* Only RPCv2 supported */
1168         svc_putnl(resv, 2);
1169         goto sendit;
1170 
1171 err_bad_auth:
1172         dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
1173         serv->sv_stats->rpcbadauth++;
1174         /* Restore write pointer to location of accept status: */
1175         xdr_ressize_check(rqstp, reply_statp);
1176         svc_putnl(resv, 1);     /* REJECT */
1177         svc_putnl(resv, 1);     /* AUTH_ERROR */
1178         svc_putnl(resv, ntohl(auth_stat));      /* status */
1179         goto sendit;
1180 
1181 err_bad_prog:
1182         dprintk("svc: unknown program %d\n", prog);
1183         serv->sv_stats->rpcbadfmt++;
1184         svc_putnl(resv, RPC_PROG_UNAVAIL);
1185         goto sendit;
1186 
1187 err_bad_vers:
1188         svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
1189                        vers, prog, progp->pg_name);
1190 
1191         serv->sv_stats->rpcbadfmt++;
1192         svc_putnl(resv, RPC_PROG_MISMATCH);
1193         svc_putnl(resv, progp->pg_lovers);
1194         svc_putnl(resv, progp->pg_hivers);
1195         goto sendit;
1196 
1197 err_bad_proc:
1198         svc_printk(rqstp, "unknown procedure (%d)\n", proc);
1199 
1200         serv->sv_stats->rpcbadfmt++;
1201         svc_putnl(resv, RPC_PROC_UNAVAIL);
1202         goto sendit;
1203 
1204 err_garbage:
1205         svc_printk(rqstp, "failed to decode args\n");
1206 
1207         rpc_stat = rpc_garbage_args;
1208 err_bad:
1209         serv->sv_stats->rpcbadfmt++;
1210         svc_putnl(resv, ntohl(rpc_stat));
1211         goto sendit;
1212 }
1213 EXPORT_SYMBOL_GPL(svc_process);
1214 
1215 /*
1216  * Process the RPC request.
1217  */
1218 int
1219 svc_process(struct svc_rqst *rqstp)
1220 {
1221         struct kvec             *argv = &rqstp->rq_arg.head[0];
1222         struct kvec             *resv = &rqstp->rq_res.head[0];
1223         struct svc_serv         *serv = rqstp->rq_server;
1224         u32                     dir;
1225 
1226         /*
1227          * Setup response xdr_buf.
1228          * Initially it has just one page
1229          */
1230         rqstp->rq_resused = 1;
1231         resv->iov_base = page_address(rqstp->rq_respages[0]);
1232         resv->iov_len = 0;
1233         rqstp->rq_res.pages = rqstp->rq_respages + 1;
1234         rqstp->rq_res.len = 0;
1235         rqstp->rq_res.page_base = 0;
1236         rqstp->rq_res.page_len = 0;
1237         rqstp->rq_res.buflen = PAGE_SIZE;
1238         rqstp->rq_res.tail[0].iov_base = NULL;
1239         rqstp->rq_res.tail[0].iov_len = 0;
1240 
1241         rqstp->rq_xid = svc_getu32(argv);
1242 
1243         dir  = svc_getnl(argv);
1244         if (dir != 0) {
1245                 /* direction != CALL */
1246                 svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
1247                 serv->sv_stats->rpcbadfmt++;
1248                 svc_drop(rqstp);
1249                 return 0;
1250         }
1251 
1252         /* Returns 1 for send, 0 for drop */
1253         if (svc_process_common(rqstp, argv, resv))
1254                 return svc_send(rqstp);
1255         else {
1256                 svc_drop(rqstp);
1257                 return 0;
1258         }
1259 }
1260 
1261 #if defined(CONFIG_NFS_V4_1)
1262 /*
1263  * Process a backchannel RPC request that arrived over an existing
1264  * outbound connection
1265  */
1266 int
1267 bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req,
1268                struct svc_rqst *rqstp)
1269 {
1270         struct kvec     *argv = &rqstp->rq_arg.head[0];
1271         struct kvec     *resv = &rqstp->rq_res.head[0];
1272 
1273         /* Build the svc_rqst used by the common processing routine */
1274         rqstp->rq_xprt = serv->sv_bc_xprt;
1275         rqstp->rq_xid = req->rq_xid;
1276         rqstp->rq_prot = req->rq_xprt->prot;
1277         rqstp->rq_server = serv;
1278 
1279         rqstp->rq_addrlen = sizeof(req->rq_xprt->addr);
1280         memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen);
1281         memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg));
1282         memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res));
1283 
1284         /* reset result send buffer "put" position */
1285         resv->iov_len = 0;
1286 
1287         if (rqstp->rq_prot != IPPROTO_TCP) {
1288                 printk(KERN_ERR "No support for Non-TCP transports!\n");
1289                 BUG();
1290         }
1291 
1292         /*
1293          * Skip the next two words because they've already been
1294          * processed in the trasport
1295          */
1296         svc_getu32(argv);       /* XID */
1297         svc_getnl(argv);        /* CALLDIR */
1298 
1299         /* Returns 1 for send, 0 for drop */
1300         if (svc_process_common(rqstp, argv, resv)) {
1301                 memcpy(&req->rq_snd_buf, &rqstp->rq_res,
1302                                                 sizeof(req->rq_snd_buf));
1303                 return bc_send(req);
1304         } else {
1305                 /* drop request */
1306                 xprt_free_bc_request(req);
1307                 return 0;
1308         }
1309 }
1310 EXPORT_SYMBOL(bc_svc_process);
1311 #endif /* CONFIG_NFS_V4_1 */
1312 
1313 /*
1314  * Return (transport-specific) limit on the rpc payload.
1315  */
1316 u32 svc_max_payload(const struct svc_rqst *rqstp)
1317 {
1318         u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
1319 
1320         if (rqstp->rq_server->sv_max_payload < max)
1321                 max = rqstp->rq_server->sv_max_payload;
1322         return max;
1323 }
1324 EXPORT_SYMBOL_GPL(svc_max_payload);
1325 

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