Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
bfd24160 GB |
7 | * |
8 | * Multiple threads pools and NUMAisation | |
9 | * Copyright (c) 2006 Silicon Graphics, Inc. | |
10 | * by Greg Banks <gnb@melbourne.sgi.com> | |
1da177e4 LT |
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> | |
a7455442 GB |
19 | #include <linux/interrupt.h> |
20 | #include <linux/module.h> | |
9867d76c | 21 | #include <linux/kthread.h> |
1da177e4 LT |
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 | ||
29 | #define RPCDBG_FACILITY RPCDBG_SVCDSP | |
1da177e4 | 30 | |
7252d575 CL |
31 | static void svc_unregister(const struct svc_serv *serv); |
32 | ||
42a7fc4a GB |
33 | #define svc_serv_is_pooled(serv) ((serv)->sv_function) |
34 | ||
bfd24160 GB |
35 | /* |
36 | * Mode for mapping cpus to pools. | |
37 | */ | |
38 | enum { | |
42a7fc4a | 39 | SVC_POOL_AUTO = -1, /* choose one of the others */ |
bfd24160 GB |
40 | SVC_POOL_GLOBAL, /* no mapping, just a single global pool |
41 | * (legacy & UP mode) */ | |
42 | SVC_POOL_PERCPU, /* one pool per cpu */ | |
43 | SVC_POOL_PERNODE /* one pool per numa node */ | |
44 | }; | |
42a7fc4a | 45 | #define SVC_POOL_DEFAULT SVC_POOL_GLOBAL |
bfd24160 GB |
46 | |
47 | /* | |
48 | * Structure for mapping cpus to pools and vice versa. | |
49 | * Setup once during sunrpc initialisation. | |
50 | */ | |
51 | static struct svc_pool_map { | |
42a7fc4a | 52 | int count; /* How many svc_servs use us */ |
bfd24160 GB |
53 | int mode; /* Note: int not enum to avoid |
54 | * warnings about "enumeration value | |
55 | * not handled in switch" */ | |
56 | unsigned int npools; | |
57 | unsigned int *pool_to; /* maps pool id to cpu or node */ | |
58 | unsigned int *to_pool; /* maps cpu or node to pool id */ | |
59 | } svc_pool_map = { | |
42a7fc4a GB |
60 | .count = 0, |
61 | .mode = SVC_POOL_DEFAULT | |
bfd24160 | 62 | }; |
42a7fc4a GB |
63 | static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */ |
64 | ||
65 | static int | |
66 | param_set_pool_mode(const char *val, struct kernel_param *kp) | |
67 | { | |
68 | int *ip = (int *)kp->arg; | |
69 | struct svc_pool_map *m = &svc_pool_map; | |
70 | int err; | |
71 | ||
72 | mutex_lock(&svc_pool_map_mutex); | |
73 | ||
74 | err = -EBUSY; | |
75 | if (m->count) | |
76 | goto out; | |
77 | ||
78 | err = 0; | |
79 | if (!strncmp(val, "auto", 4)) | |
80 | *ip = SVC_POOL_AUTO; | |
81 | else if (!strncmp(val, "global", 6)) | |
82 | *ip = SVC_POOL_GLOBAL; | |
83 | else if (!strncmp(val, "percpu", 6)) | |
84 | *ip = SVC_POOL_PERCPU; | |
85 | else if (!strncmp(val, "pernode", 7)) | |
86 | *ip = SVC_POOL_PERNODE; | |
87 | else | |
88 | err = -EINVAL; | |
89 | ||
90 | out: | |
91 | mutex_unlock(&svc_pool_map_mutex); | |
92 | return err; | |
93 | } | |
94 | ||
95 | static int | |
96 | param_get_pool_mode(char *buf, struct kernel_param *kp) | |
97 | { | |
98 | int *ip = (int *)kp->arg; | |
99 | ||
100 | switch (*ip) | |
101 | { | |
102 | case SVC_POOL_AUTO: | |
103 | return strlcpy(buf, "auto", 20); | |
104 | case SVC_POOL_GLOBAL: | |
105 | return strlcpy(buf, "global", 20); | |
106 | case SVC_POOL_PERCPU: | |
107 | return strlcpy(buf, "percpu", 20); | |
108 | case SVC_POOL_PERNODE: | |
109 | return strlcpy(buf, "pernode", 20); | |
110 | default: | |
111 | return sprintf(buf, "%d", *ip); | |
112 | } | |
113 | } | |
bfd24160 | 114 | |
42a7fc4a GB |
115 | module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode, |
116 | &svc_pool_map.mode, 0644); | |
bfd24160 GB |
117 | |
118 | /* | |
119 | * Detect best pool mapping mode heuristically, | |
120 | * according to the machine's topology. | |
121 | */ | |
122 | static int | |
123 | svc_pool_map_choose_mode(void) | |
124 | { | |
125 | unsigned int node; | |
126 | ||
127 | if (num_online_nodes() > 1) { | |
128 | /* | |
129 | * Actually have multiple NUMA nodes, | |
130 | * so split pools on NUMA node boundaries | |
131 | */ | |
132 | return SVC_POOL_PERNODE; | |
133 | } | |
134 | ||
135 | node = any_online_node(node_online_map); | |
136 | if (nr_cpus_node(node) > 2) { | |
137 | /* | |
138 | * Non-trivial SMP, or CONFIG_NUMA on | |
139 | * non-NUMA hardware, e.g. with a generic | |
140 | * x86_64 kernel on Xeons. In this case we | |
141 | * want to divide the pools on cpu boundaries. | |
142 | */ | |
143 | return SVC_POOL_PERCPU; | |
144 | } | |
145 | ||
146 | /* default: one global pool */ | |
147 | return SVC_POOL_GLOBAL; | |
148 | } | |
149 | ||
150 | /* | |
151 | * Allocate the to_pool[] and pool_to[] arrays. | |
152 | * Returns 0 on success or an errno. | |
153 | */ | |
154 | static int | |
155 | svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools) | |
156 | { | |
157 | m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); | |
158 | if (!m->to_pool) | |
159 | goto fail; | |
160 | m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); | |
161 | if (!m->pool_to) | |
162 | goto fail_free; | |
163 | ||
164 | return 0; | |
165 | ||
166 | fail_free: | |
167 | kfree(m->to_pool); | |
168 | fail: | |
169 | return -ENOMEM; | |
170 | } | |
171 | ||
172 | /* | |
173 | * Initialise the pool map for SVC_POOL_PERCPU mode. | |
174 | * Returns number of pools or <0 on error. | |
175 | */ | |
176 | static int | |
177 | svc_pool_map_init_percpu(struct svc_pool_map *m) | |
178 | { | |
53b8a315 | 179 | unsigned int maxpools = nr_cpu_ids; |
bfd24160 GB |
180 | unsigned int pidx = 0; |
181 | unsigned int cpu; | |
182 | int err; | |
183 | ||
184 | err = svc_pool_map_alloc_arrays(m, maxpools); | |
185 | if (err) | |
186 | return err; | |
187 | ||
188 | for_each_online_cpu(cpu) { | |
189 | BUG_ON(pidx > maxpools); | |
190 | m->to_pool[cpu] = pidx; | |
191 | m->pool_to[pidx] = cpu; | |
192 | pidx++; | |
193 | } | |
194 | /* cpus brought online later all get mapped to pool0, sorry */ | |
195 | ||
196 | return pidx; | |
197 | }; | |
198 | ||
199 | ||
200 | /* | |
201 | * Initialise the pool map for SVC_POOL_PERNODE mode. | |
202 | * Returns number of pools or <0 on error. | |
203 | */ | |
204 | static int | |
205 | svc_pool_map_init_pernode(struct svc_pool_map *m) | |
206 | { | |
74c7aa8b | 207 | unsigned int maxpools = nr_node_ids; |
bfd24160 GB |
208 | unsigned int pidx = 0; |
209 | unsigned int node; | |
210 | int err; | |
211 | ||
212 | err = svc_pool_map_alloc_arrays(m, maxpools); | |
213 | if (err) | |
214 | return err; | |
215 | ||
216 | for_each_node_with_cpus(node) { | |
217 | /* some architectures (e.g. SN2) have cpuless nodes */ | |
218 | BUG_ON(pidx > maxpools); | |
219 | m->to_pool[node] = pidx; | |
220 | m->pool_to[pidx] = node; | |
221 | pidx++; | |
222 | } | |
223 | /* nodes brought online later all get mapped to pool0, sorry */ | |
224 | ||
225 | return pidx; | |
226 | } | |
227 | ||
228 | ||
229 | /* | |
42a7fc4a GB |
230 | * Add a reference to the global map of cpus to pools (and |
231 | * vice versa). Initialise the map if we're the first user. | |
232 | * Returns the number of pools. | |
bfd24160 GB |
233 | */ |
234 | static unsigned int | |
42a7fc4a | 235 | svc_pool_map_get(void) |
bfd24160 GB |
236 | { |
237 | struct svc_pool_map *m = &svc_pool_map; | |
238 | int npools = -1; | |
239 | ||
42a7fc4a GB |
240 | mutex_lock(&svc_pool_map_mutex); |
241 | ||
242 | if (m->count++) { | |
243 | mutex_unlock(&svc_pool_map_mutex); | |
bfd24160 | 244 | return m->npools; |
42a7fc4a | 245 | } |
bfd24160 | 246 | |
42a7fc4a GB |
247 | if (m->mode == SVC_POOL_AUTO) |
248 | m->mode = svc_pool_map_choose_mode(); | |
bfd24160 GB |
249 | |
250 | switch (m->mode) { | |
251 | case SVC_POOL_PERCPU: | |
252 | npools = svc_pool_map_init_percpu(m); | |
253 | break; | |
254 | case SVC_POOL_PERNODE: | |
255 | npools = svc_pool_map_init_pernode(m); | |
256 | break; | |
257 | } | |
258 | ||
259 | if (npools < 0) { | |
260 | /* default, or memory allocation failure */ | |
261 | npools = 1; | |
262 | m->mode = SVC_POOL_GLOBAL; | |
263 | } | |
264 | m->npools = npools; | |
265 | ||
42a7fc4a | 266 | mutex_unlock(&svc_pool_map_mutex); |
bfd24160 GB |
267 | return m->npools; |
268 | } | |
269 | ||
42a7fc4a GB |
270 | |
271 | /* | |
272 | * Drop a reference to the global map of cpus to pools. | |
273 | * When the last reference is dropped, the map data is | |
274 | * freed; this allows the sysadmin to change the pool | |
275 | * mode using the pool_mode module option without | |
276 | * rebooting or re-loading sunrpc.ko. | |
277 | */ | |
278 | static void | |
279 | svc_pool_map_put(void) | |
280 | { | |
281 | struct svc_pool_map *m = &svc_pool_map; | |
282 | ||
283 | mutex_lock(&svc_pool_map_mutex); | |
284 | ||
285 | if (!--m->count) { | |
286 | m->mode = SVC_POOL_DEFAULT; | |
287 | kfree(m->to_pool); | |
288 | kfree(m->pool_to); | |
289 | m->npools = 0; | |
290 | } | |
291 | ||
292 | mutex_unlock(&svc_pool_map_mutex); | |
293 | } | |
294 | ||
295 | ||
bfd24160 | 296 | /* |
9867d76c | 297 | * Set the given thread's cpus_allowed mask so that it |
bfd24160 | 298 | * will only run on cpus in the given pool. |
bfd24160 | 299 | */ |
9867d76c JL |
300 | static inline void |
301 | svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx) | |
bfd24160 GB |
302 | { |
303 | struct svc_pool_map *m = &svc_pool_map; | |
9867d76c | 304 | unsigned int node = m->pool_to[pidx]; |
bfd24160 GB |
305 | |
306 | /* | |
307 | * The caller checks for sv_nrpools > 1, which | |
42a7fc4a | 308 | * implies that we've been initialized. |
bfd24160 | 309 | */ |
42a7fc4a | 310 | BUG_ON(m->count == 0); |
bfd24160 | 311 | |
9867d76c | 312 | switch (m->mode) { |
bfd24160 | 313 | case SVC_POOL_PERCPU: |
c5f59f08 | 314 | { |
0bc3cc03 | 315 | set_cpus_allowed_ptr(task, &cpumask_of_cpu(node)); |
9867d76c | 316 | break; |
c5f59f08 | 317 | } |
bfd24160 | 318 | case SVC_POOL_PERNODE: |
c5f59f08 | 319 | { |
c5f59f08 | 320 | node_to_cpumask_ptr(nodecpumask, node); |
9867d76c JL |
321 | set_cpus_allowed_ptr(task, nodecpumask); |
322 | break; | |
bfd24160 | 323 | } |
c5f59f08 | 324 | } |
bfd24160 GB |
325 | } |
326 | ||
327 | /* | |
328 | * Use the mapping mode to choose a pool for a given CPU. | |
329 | * Used when enqueueing an incoming RPC. Always returns | |
330 | * a non-NULL pool pointer. | |
331 | */ | |
332 | struct svc_pool * | |
333 | svc_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 | /* | |
42a7fc4a | 339 | * An uninitialised map happens in a pure client when |
bfd24160 GB |
340 | * lockd is brought up, so silently treat it the |
341 | * same as SVC_POOL_GLOBAL. | |
342 | */ | |
42a7fc4a GB |
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 | } | |
bfd24160 GB |
352 | } |
353 | return &serv->sv_pools[pidx % serv->sv_nrpools]; | |
354 | } | |
355 | ||
356 | ||
1da177e4 LT |
357 | /* |
358 | * Create an RPC service | |
359 | */ | |
a7455442 GB |
360 | static struct svc_serv * |
361 | __svc_create(struct svc_program *prog, unsigned int bufsize, int npools, | |
e851db5b | 362 | sa_family_t family, void (*shutdown)(struct svc_serv *serv)) |
1da177e4 LT |
363 | { |
364 | struct svc_serv *serv; | |
ea339d46 | 365 | unsigned int vers; |
1da177e4 | 366 | unsigned int xdrsize; |
3262c816 | 367 | unsigned int i; |
1da177e4 | 368 | |
0da974f4 | 369 | if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL))) |
1da177e4 | 370 | return NULL; |
e851db5b | 371 | serv->sv_family = family; |
9ba02638 | 372 | serv->sv_name = prog->pg_name; |
1da177e4 LT |
373 | serv->sv_program = prog; |
374 | serv->sv_nrthreads = 1; | |
375 | serv->sv_stats = prog->pg_stats; | |
c6b0a9f8 N |
376 | if (bufsize > RPCSVC_MAXPAYLOAD) |
377 | bufsize = RPCSVC_MAXPAYLOAD; | |
378 | serv->sv_max_payload = bufsize? bufsize : 4096; | |
379 | serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE); | |
bc591ccf | 380 | serv->sv_shutdown = shutdown; |
1da177e4 | 381 | xdrsize = 0; |
9ba02638 AG |
382 | while (prog) { |
383 | prog->pg_lovers = prog->pg_nvers-1; | |
384 | for (vers=0; vers<prog->pg_nvers ; vers++) | |
385 | if (prog->pg_vers[vers]) { | |
386 | prog->pg_hivers = vers; | |
387 | if (prog->pg_lovers > vers) | |
388 | prog->pg_lovers = vers; | |
389 | if (prog->pg_vers[vers]->vs_xdrsize > xdrsize) | |
390 | xdrsize = prog->pg_vers[vers]->vs_xdrsize; | |
391 | } | |
392 | prog = prog->pg_next; | |
393 | } | |
1da177e4 | 394 | serv->sv_xdrsize = xdrsize; |
1da177e4 LT |
395 | INIT_LIST_HEAD(&serv->sv_tempsocks); |
396 | INIT_LIST_HEAD(&serv->sv_permsocks); | |
36bdfc8b | 397 | init_timer(&serv->sv_temptimer); |
1da177e4 LT |
398 | spin_lock_init(&serv->sv_lock); |
399 | ||
a7455442 | 400 | serv->sv_nrpools = npools; |
3262c816 | 401 | serv->sv_pools = |
cd861280 | 402 | kcalloc(serv->sv_nrpools, sizeof(struct svc_pool), |
3262c816 GB |
403 | GFP_KERNEL); |
404 | if (!serv->sv_pools) { | |
405 | kfree(serv); | |
406 | return NULL; | |
407 | } | |
408 | ||
409 | for (i = 0; i < serv->sv_nrpools; i++) { | |
410 | struct svc_pool *pool = &serv->sv_pools[i]; | |
411 | ||
46121cf7 | 412 | dprintk("svc: initialising pool %u for %s\n", |
3262c816 GB |
413 | i, serv->sv_name); |
414 | ||
415 | pool->sp_id = i; | |
416 | INIT_LIST_HEAD(&pool->sp_threads); | |
417 | INIT_LIST_HEAD(&pool->sp_sockets); | |
a7455442 | 418 | INIT_LIST_HEAD(&pool->sp_all_threads); |
3262c816 GB |
419 | spin_lock_init(&pool->sp_lock); |
420 | } | |
421 | ||
1da177e4 | 422 | /* Remove any stale portmap registrations */ |
7252d575 | 423 | svc_unregister(serv); |
1da177e4 LT |
424 | |
425 | return serv; | |
426 | } | |
427 | ||
a7455442 GB |
428 | struct svc_serv * |
429 | svc_create(struct svc_program *prog, unsigned int bufsize, | |
e851db5b | 430 | sa_family_t family, void (*shutdown)(struct svc_serv *serv)) |
a7455442 | 431 | { |
e851db5b | 432 | return __svc_create(prog, bufsize, /*npools*/1, family, shutdown); |
a7455442 | 433 | } |
d2f7e79e | 434 | EXPORT_SYMBOL(svc_create); |
a7455442 GB |
435 | |
436 | struct svc_serv * | |
437 | svc_create_pooled(struct svc_program *prog, unsigned int bufsize, | |
e851db5b | 438 | sa_family_t family, void (*shutdown)(struct svc_serv *serv), |
a75c5d01 | 439 | svc_thread_fn func, struct module *mod) |
a7455442 GB |
440 | { |
441 | struct svc_serv *serv; | |
42a7fc4a | 442 | unsigned int npools = svc_pool_map_get(); |
a7455442 | 443 | |
e851db5b | 444 | serv = __svc_create(prog, bufsize, npools, family, shutdown); |
a7455442 GB |
445 | |
446 | if (serv != NULL) { | |
447 | serv->sv_function = func; | |
a7455442 GB |
448 | serv->sv_module = mod; |
449 | } | |
450 | ||
451 | return serv; | |
452 | } | |
d2f7e79e | 453 | EXPORT_SYMBOL(svc_create_pooled); |
a7455442 | 454 | |
1da177e4 | 455 | /* |
bedbdd8b NB |
456 | * Destroy an RPC service. Should be called with appropriate locking to |
457 | * protect the sv_nrthreads, sv_permsocks and sv_tempsocks. | |
1da177e4 LT |
458 | */ |
459 | void | |
460 | svc_destroy(struct svc_serv *serv) | |
461 | { | |
46121cf7 | 462 | dprintk("svc: svc_destroy(%s, %d)\n", |
1da177e4 LT |
463 | serv->sv_program->pg_name, |
464 | serv->sv_nrthreads); | |
465 | ||
466 | if (serv->sv_nrthreads) { | |
467 | if (--(serv->sv_nrthreads) != 0) { | |
468 | svc_sock_update_bufs(serv); | |
469 | return; | |
470 | } | |
471 | } else | |
472 | printk("svc_destroy: no threads for serv=%p!\n", serv); | |
473 | ||
36bdfc8b GB |
474 | del_timer_sync(&serv->sv_temptimer); |
475 | ||
7a182083 | 476 | svc_close_all(&serv->sv_tempsocks); |
cda1fd4a | 477 | |
bc591ccf N |
478 | if (serv->sv_shutdown) |
479 | serv->sv_shutdown(serv); | |
480 | ||
7a182083 | 481 | svc_close_all(&serv->sv_permsocks); |
cda1fd4a N |
482 | |
483 | BUG_ON(!list_empty(&serv->sv_permsocks)); | |
484 | BUG_ON(!list_empty(&serv->sv_tempsocks)); | |
cca5172a | 485 | |
1da177e4 LT |
486 | cache_clean_deferred(serv); |
487 | ||
42a7fc4a GB |
488 | if (svc_serv_is_pooled(serv)) |
489 | svc_pool_map_put(); | |
490 | ||
7252d575 | 491 | svc_unregister(serv); |
3262c816 | 492 | kfree(serv->sv_pools); |
1da177e4 LT |
493 | kfree(serv); |
494 | } | |
d2f7e79e | 495 | EXPORT_SYMBOL(svc_destroy); |
1da177e4 LT |
496 | |
497 | /* | |
498 | * Allocate an RPC server's buffer space. | |
499 | * We allocate pages and place them in rq_argpages. | |
500 | */ | |
501 | static int | |
502 | svc_init_buffer(struct svc_rqst *rqstp, unsigned int size) | |
503 | { | |
0dc220f0 | 504 | unsigned int pages, arghi; |
cca5172a | 505 | |
c6b0a9f8 N |
506 | pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply. |
507 | * We assume one is at most one page | |
508 | */ | |
1da177e4 | 509 | arghi = 0; |
09a62660 | 510 | BUG_ON(pages > RPCSVC_MAXPAGES); |
1da177e4 LT |
511 | while (pages) { |
512 | struct page *p = alloc_page(GFP_KERNEL); | |
513 | if (!p) | |
514 | break; | |
44524359 | 515 | rqstp->rq_pages[arghi++] = p; |
1da177e4 LT |
516 | pages--; |
517 | } | |
0dc220f0 | 518 | return pages == 0; |
1da177e4 LT |
519 | } |
520 | ||
521 | /* | |
522 | * Release an RPC server buffer | |
523 | */ | |
524 | static void | |
525 | svc_release_buffer(struct svc_rqst *rqstp) | |
526 | { | |
50c8bb13 CL |
527 | unsigned int i; |
528 | ||
529 | for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++) | |
44524359 N |
530 | if (rqstp->rq_pages[i]) |
531 | put_page(rqstp->rq_pages[i]); | |
1da177e4 LT |
532 | } |
533 | ||
0113ab34 JL |
534 | struct svc_rqst * |
535 | svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool) | |
1da177e4 LT |
536 | { |
537 | struct svc_rqst *rqstp; | |
1da177e4 | 538 | |
0da974f4 | 539 | rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL); |
1da177e4 | 540 | if (!rqstp) |
0113ab34 | 541 | goto out_enomem; |
1da177e4 | 542 | |
1da177e4 LT |
543 | init_waitqueue_head(&rqstp->rq_wait); |
544 | ||
1da177e4 | 545 | serv->sv_nrthreads++; |
3262c816 GB |
546 | spin_lock_bh(&pool->sp_lock); |
547 | pool->sp_nrthreads++; | |
a7455442 | 548 | list_add(&rqstp->rq_all, &pool->sp_all_threads); |
3262c816 | 549 | spin_unlock_bh(&pool->sp_lock); |
1da177e4 | 550 | rqstp->rq_server = serv; |
3262c816 | 551 | rqstp->rq_pool = pool; |
bfd24160 | 552 | |
0113ab34 JL |
553 | rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); |
554 | if (!rqstp->rq_argp) | |
555 | goto out_thread; | |
556 | ||
557 | rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); | |
558 | if (!rqstp->rq_resp) | |
559 | goto out_thread; | |
560 | ||
561 | if (!svc_init_buffer(rqstp, serv->sv_max_mesg)) | |
562 | goto out_thread; | |
563 | ||
564 | return rqstp; | |
565 | out_thread: | |
566 | svc_exit_thread(rqstp); | |
567 | out_enomem: | |
568 | return ERR_PTR(-ENOMEM); | |
569 | } | |
570 | EXPORT_SYMBOL(svc_prepare_thread); | |
571 | ||
a7455442 GB |
572 | /* |
573 | * Choose a pool in which to create a new thread, for svc_set_num_threads | |
574 | */ | |
575 | static inline struct svc_pool * | |
576 | choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) | |
577 | { | |
578 | if (pool != NULL) | |
579 | return pool; | |
580 | ||
cca5172a | 581 | return &serv->sv_pools[(*state)++ % serv->sv_nrpools]; |
a7455442 GB |
582 | } |
583 | ||
584 | /* | |
585 | * Choose a thread to kill, for svc_set_num_threads | |
586 | */ | |
587 | static inline struct task_struct * | |
588 | choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) | |
589 | { | |
590 | unsigned int i; | |
591 | struct task_struct *task = NULL; | |
592 | ||
593 | if (pool != NULL) { | |
594 | spin_lock_bh(&pool->sp_lock); | |
595 | } else { | |
596 | /* choose a pool in round-robin fashion */ | |
cca5172a YH |
597 | for (i = 0; i < serv->sv_nrpools; i++) { |
598 | pool = &serv->sv_pools[--(*state) % serv->sv_nrpools]; | |
a7455442 | 599 | spin_lock_bh(&pool->sp_lock); |
cca5172a YH |
600 | if (!list_empty(&pool->sp_all_threads)) |
601 | goto found_pool; | |
a7455442 | 602 | spin_unlock_bh(&pool->sp_lock); |
cca5172a | 603 | } |
a7455442 GB |
604 | return NULL; |
605 | } | |
606 | ||
607 | found_pool: | |
608 | if (!list_empty(&pool->sp_all_threads)) { | |
609 | struct svc_rqst *rqstp; | |
610 | ||
611 | /* | |
612 | * Remove from the pool->sp_all_threads list | |
613 | * so we don't try to kill it again. | |
614 | */ | |
615 | rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all); | |
616 | list_del_init(&rqstp->rq_all); | |
617 | task = rqstp->rq_task; | |
cca5172a | 618 | } |
a7455442 GB |
619 | spin_unlock_bh(&pool->sp_lock); |
620 | ||
621 | return task; | |
622 | } | |
623 | ||
624 | /* | |
625 | * Create or destroy enough new threads to make the number | |
626 | * of threads the given number. If `pool' is non-NULL, applies | |
627 | * only to threads in that pool, otherwise round-robins between | |
628 | * all pools. Must be called with a svc_get() reference and | |
bedbdd8b | 629 | * the BKL or another lock to protect access to svc_serv fields. |
a7455442 GB |
630 | * |
631 | * Destroying threads relies on the service threads filling in | |
632 | * rqstp->rq_task, which only the nfs ones do. Assumes the serv | |
633 | * has been created using svc_create_pooled(). | |
634 | * | |
635 | * Based on code that used to be in nfsd_svc() but tweaked | |
636 | * to be pool-aware. | |
637 | */ | |
638 | int | |
639 | svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) | |
640 | { | |
9867d76c JL |
641 | struct svc_rqst *rqstp; |
642 | struct task_struct *task; | |
643 | struct svc_pool *chosen_pool; | |
a7455442 GB |
644 | int error = 0; |
645 | unsigned int state = serv->sv_nrthreads-1; | |
646 | ||
647 | if (pool == NULL) { | |
648 | /* The -1 assumes caller has done a svc_get() */ | |
649 | nrservs -= (serv->sv_nrthreads-1); | |
650 | } else { | |
651 | spin_lock_bh(&pool->sp_lock); | |
652 | nrservs -= pool->sp_nrthreads; | |
653 | spin_unlock_bh(&pool->sp_lock); | |
654 | } | |
655 | ||
656 | /* create new threads */ | |
657 | while (nrservs > 0) { | |
658 | nrservs--; | |
9867d76c JL |
659 | chosen_pool = choose_pool(serv, pool, &state); |
660 | ||
661 | rqstp = svc_prepare_thread(serv, chosen_pool); | |
662 | if (IS_ERR(rqstp)) { | |
663 | error = PTR_ERR(rqstp); | |
664 | break; | |
665 | } | |
666 | ||
a7455442 | 667 | __module_get(serv->sv_module); |
9867d76c JL |
668 | task = kthread_create(serv->sv_function, rqstp, serv->sv_name); |
669 | if (IS_ERR(task)) { | |
670 | error = PTR_ERR(task); | |
a7455442 | 671 | module_put(serv->sv_module); |
9867d76c | 672 | svc_exit_thread(rqstp); |
a7455442 GB |
673 | break; |
674 | } | |
9867d76c JL |
675 | |
676 | rqstp->rq_task = task; | |
677 | if (serv->sv_nrpools > 1) | |
678 | svc_pool_map_set_cpumask(task, chosen_pool->sp_id); | |
679 | ||
680 | svc_sock_update_bufs(serv); | |
681 | wake_up_process(task); | |
a7455442 GB |
682 | } |
683 | /* destroy old threads */ | |
684 | while (nrservs < 0 && | |
9867d76c | 685 | (task = choose_victim(serv, pool, &state)) != NULL) { |
a75c5d01 | 686 | send_sig(SIGINT, task, 1); |
a7455442 GB |
687 | nrservs++; |
688 | } | |
689 | ||
690 | return error; | |
691 | } | |
d2f7e79e | 692 | EXPORT_SYMBOL(svc_set_num_threads); |
a7455442 | 693 | |
3262c816 | 694 | /* |
bedbdd8b NB |
695 | * Called from a server thread as it's exiting. Caller must hold the BKL or |
696 | * the "service mutex", whichever is appropriate for the service. | |
1da177e4 LT |
697 | */ |
698 | void | |
699 | svc_exit_thread(struct svc_rqst *rqstp) | |
700 | { | |
701 | struct svc_serv *serv = rqstp->rq_server; | |
3262c816 | 702 | struct svc_pool *pool = rqstp->rq_pool; |
1da177e4 LT |
703 | |
704 | svc_release_buffer(rqstp); | |
a51482bd JJ |
705 | kfree(rqstp->rq_resp); |
706 | kfree(rqstp->rq_argp); | |
707 | kfree(rqstp->rq_auth_data); | |
3262c816 GB |
708 | |
709 | spin_lock_bh(&pool->sp_lock); | |
710 | pool->sp_nrthreads--; | |
a7455442 | 711 | list_del(&rqstp->rq_all); |
3262c816 GB |
712 | spin_unlock_bh(&pool->sp_lock); |
713 | ||
1da177e4 LT |
714 | kfree(rqstp); |
715 | ||
716 | /* Release the server */ | |
717 | if (serv) | |
718 | svc_destroy(serv); | |
719 | } | |
d2f7e79e | 720 | EXPORT_SYMBOL(svc_exit_thread); |
1da177e4 LT |
721 | |
722 | /* | |
723 | * Register an RPC service with the local portmapper. | |
cca5172a | 724 | * To unregister a service, call this routine with |
1da177e4 LT |
725 | * proto and port == 0. |
726 | */ | |
727 | int | |
728 | svc_register(struct svc_serv *serv, int proto, unsigned short port) | |
729 | { | |
730 | struct svc_program *progp; | |
ea339d46 | 731 | unsigned int i; |
14aeb211 | 732 | int error = 0; |
1da177e4 | 733 | |
7252d575 | 734 | BUG_ON(proto == 0 && port == 0); |
1da177e4 | 735 | |
bc5fea42 OK |
736 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { |
737 | for (i = 0; i < progp->pg_nvers; i++) { | |
738 | if (progp->pg_vers[i] == NULL) | |
739 | continue; | |
740 | ||
46121cf7 | 741 | dprintk("svc: svc_register(%s, %s, %d, %d)%s\n", |
bc5fea42 OK |
742 | progp->pg_name, |
743 | proto == IPPROTO_UDP? "udp" : "tcp", | |
744 | port, | |
745 | i, | |
746 | progp->pg_vers[i]->vs_hidden? | |
747 | " (but not telling portmap)" : ""); | |
748 | ||
749 | if (progp->pg_vers[i]->vs_hidden) | |
750 | continue; | |
751 | ||
14aeb211 | 752 | error = rpcb_register(progp->pg_prog, i, proto, port); |
bc5fea42 OK |
753 | if (error < 0) |
754 | break; | |
1da177e4 LT |
755 | } |
756 | } | |
757 | ||
7252d575 CL |
758 | return error; |
759 | } | |
760 | ||
761 | /* | |
762 | * All transport protocols and ports for this service are removed | |
763 | * from the local rpcbind database if the service is not hidden. | |
764 | * | |
765 | * The result of unregistration is reported via dprintk for those | |
766 | * who want verification of the result, but is otherwise not | |
767 | * important. | |
768 | * | |
769 | * The local rpcbind daemon listens on either only IPv6 or only | |
770 | * IPv4. The kernel can't tell how it's configured. However, | |
771 | * AF_INET addresses are mapped to AF_INET6 in IPv6-only config- | |
772 | * urations, so even an unregistration request on AF_INET will | |
773 | * get to a local rpcbind daemon listening only on AF_INET6. So | |
774 | * we always unregister via AF_INET. | |
775 | * | |
776 | * At this point we don't need rpcbind version 4 for unregis- | |
777 | * tration: A v2 UNSET request will clear all transports (netids), | |
778 | * addresses, and address families for [program, version]. | |
779 | */ | |
780 | static void svc_unregister(const struct svc_serv *serv) | |
781 | { | |
782 | struct svc_program *progp; | |
783 | unsigned long flags; | |
784 | unsigned int i; | |
785 | int error; | |
786 | ||
787 | clear_thread_flag(TIF_SIGPENDING); | |
788 | ||
789 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { | |
790 | for (i = 0; i < progp->pg_nvers; i++) { | |
791 | if (progp->pg_vers[i] == NULL) | |
792 | continue; | |
793 | if (progp->pg_vers[i]->vs_hidden) | |
794 | continue; | |
795 | ||
796 | error = rpcb_register(progp->pg_prog, i, 0, 0); | |
797 | dprintk("svc: svc_unregister(%sv%u), error %d\n", | |
798 | progp->pg_name, i, error); | |
799 | } | |
1da177e4 LT |
800 | } |
801 | ||
7252d575 CL |
802 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
803 | recalc_sigpending(); | |
804 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
1da177e4 LT |
805 | } |
806 | ||
354ecbb9 DDAG |
807 | /* |
808 | * Printk the given error with the address of the client that caused it. | |
809 | */ | |
810 | static int | |
811 | __attribute__ ((format (printf, 2, 3))) | |
812 | svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) | |
813 | { | |
814 | va_list args; | |
815 | int r; | |
816 | char buf[RPC_MAX_ADDRBUFLEN]; | |
817 | ||
818 | if (!net_ratelimit()) | |
819 | return 0; | |
820 | ||
821 | printk(KERN_WARNING "svc: %s: ", | |
822 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
823 | ||
824 | va_start(args, fmt); | |
825 | r = vprintk(fmt, args); | |
826 | va_end(args); | |
827 | ||
828 | return r; | |
829 | } | |
830 | ||
1da177e4 LT |
831 | /* |
832 | * Process the RPC request. | |
833 | */ | |
834 | int | |
6fb2b47f | 835 | svc_process(struct svc_rqst *rqstp) |
1da177e4 LT |
836 | { |
837 | struct svc_program *progp; | |
838 | struct svc_version *versp = NULL; /* compiler food */ | |
839 | struct svc_procedure *procp = NULL; | |
840 | struct kvec * argv = &rqstp->rq_arg.head[0]; | |
841 | struct kvec * resv = &rqstp->rq_res.head[0]; | |
6fb2b47f | 842 | struct svc_serv *serv = rqstp->rq_server; |
1da177e4 | 843 | kxdrproc_t xdr; |
d8ed029d AD |
844 | __be32 *statp; |
845 | u32 dir, prog, vers, proc; | |
846 | __be32 auth_stat, rpc_stat; | |
1da177e4 | 847 | int auth_res; |
8f8e05c5 | 848 | __be32 *reply_statp; |
1da177e4 LT |
849 | |
850 | rpc_stat = rpc_success; | |
851 | ||
852 | if (argv->iov_len < 6*4) | |
853 | goto err_short_len; | |
854 | ||
855 | /* setup response xdr_buf. | |
cca5172a | 856 | * Initially it has just one page |
1da177e4 | 857 | */ |
44524359 | 858 | rqstp->rq_resused = 1; |
1da177e4 LT |
859 | resv->iov_base = page_address(rqstp->rq_respages[0]); |
860 | resv->iov_len = 0; | |
44524359 | 861 | rqstp->rq_res.pages = rqstp->rq_respages + 1; |
1da177e4 LT |
862 | rqstp->rq_res.len = 0; |
863 | rqstp->rq_res.page_base = 0; | |
864 | rqstp->rq_res.page_len = 0; | |
334ccfd5 | 865 | rqstp->rq_res.buflen = PAGE_SIZE; |
7c9fdcfb | 866 | rqstp->rq_res.tail[0].iov_base = NULL; |
1da177e4 | 867 | rqstp->rq_res.tail[0].iov_len = 0; |
5c04c46a | 868 | /* Will be turned off only in gss privacy case: */ |
cf8208d0 | 869 | rqstp->rq_splice_ok = 1; |
e831fe65 TT |
870 | |
871 | /* Setup reply header */ | |
872 | rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp); | |
1da177e4 LT |
873 | |
874 | rqstp->rq_xid = svc_getu32(argv); | |
875 | svc_putu32(resv, rqstp->rq_xid); | |
876 | ||
76994313 AD |
877 | dir = svc_getnl(argv); |
878 | vers = svc_getnl(argv); | |
1da177e4 LT |
879 | |
880 | /* First words of reply: */ | |
76994313 | 881 | svc_putnl(resv, 1); /* REPLY */ |
1da177e4 LT |
882 | |
883 | if (dir != 0) /* direction != CALL */ | |
884 | goto err_bad_dir; | |
885 | if (vers != 2) /* RPC version number */ | |
886 | goto err_bad_rpc; | |
887 | ||
888 | /* Save position in case we later decide to reject: */ | |
8f8e05c5 | 889 | reply_statp = resv->iov_base + resv->iov_len; |
1da177e4 | 890 | |
76994313 | 891 | svc_putnl(resv, 0); /* ACCEPT */ |
1da177e4 | 892 | |
76994313 AD |
893 | rqstp->rq_prog = prog = svc_getnl(argv); /* program number */ |
894 | rqstp->rq_vers = vers = svc_getnl(argv); /* version number */ | |
895 | rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */ | |
1da177e4 LT |
896 | |
897 | progp = serv->sv_program; | |
80d188a6 N |
898 | |
899 | for (progp = serv->sv_program; progp; progp = progp->pg_next) | |
900 | if (prog == progp->pg_prog) | |
901 | break; | |
902 | ||
1da177e4 LT |
903 | /* |
904 | * Decode auth data, and add verifier to reply buffer. | |
905 | * We do this before anything else in order to get a decent | |
906 | * auth verifier. | |
907 | */ | |
908 | auth_res = svc_authenticate(rqstp, &auth_stat); | |
909 | /* Also give the program a chance to reject this call: */ | |
80d188a6 | 910 | if (auth_res == SVC_OK && progp) { |
1da177e4 LT |
911 | auth_stat = rpc_autherr_badcred; |
912 | auth_res = progp->pg_authenticate(rqstp); | |
913 | } | |
914 | switch (auth_res) { | |
915 | case SVC_OK: | |
916 | break; | |
917 | case SVC_GARBAGE: | |
dd35210e | 918 | goto err_garbage; |
1da177e4 LT |
919 | case SVC_SYSERR: |
920 | rpc_stat = rpc_system_err; | |
921 | goto err_bad; | |
922 | case SVC_DENIED: | |
923 | goto err_bad_auth; | |
924 | case SVC_DROP: | |
925 | goto dropit; | |
926 | case SVC_COMPLETE: | |
927 | goto sendit; | |
928 | } | |
80d188a6 | 929 | |
9ba02638 | 930 | if (progp == NULL) |
1da177e4 LT |
931 | goto err_bad_prog; |
932 | ||
933 | if (vers >= progp->pg_nvers || | |
934 | !(versp = progp->pg_vers[vers])) | |
935 | goto err_bad_vers; | |
936 | ||
937 | procp = versp->vs_proc + proc; | |
938 | if (proc >= versp->vs_nproc || !procp->pc_func) | |
939 | goto err_bad_proc; | |
940 | rqstp->rq_server = serv; | |
941 | rqstp->rq_procinfo = procp; | |
942 | ||
943 | /* Syntactic check complete */ | |
944 | serv->sv_stats->rpccnt++; | |
945 | ||
946 | /* Build the reply header. */ | |
947 | statp = resv->iov_base +resv->iov_len; | |
76994313 | 948 | svc_putnl(resv, RPC_SUCCESS); |
1da177e4 LT |
949 | |
950 | /* Bump per-procedure stats counter */ | |
951 | procp->pc_count++; | |
952 | ||
953 | /* Initialize storage for argp and resp */ | |
954 | memset(rqstp->rq_argp, 0, procp->pc_argsize); | |
955 | memset(rqstp->rq_resp, 0, procp->pc_ressize); | |
956 | ||
cca5172a | 957 | /* un-reserve some of the out-queue now that we have a |
1da177e4 LT |
958 | * better idea of reply size |
959 | */ | |
960 | if (procp->pc_xdrressize) | |
cd123012 | 961 | svc_reserve_auth(rqstp, procp->pc_xdrressize<<2); |
1da177e4 LT |
962 | |
963 | /* Call the function that processes the request. */ | |
964 | if (!versp->vs_dispatch) { | |
965 | /* Decode arguments */ | |
966 | xdr = procp->pc_decode; | |
967 | if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp)) | |
968 | goto err_garbage; | |
969 | ||
970 | *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
971 | ||
972 | /* Encode reply */ | |
d343fce1 N |
973 | if (*statp == rpc_drop_reply) { |
974 | if (procp->pc_release) | |
975 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); | |
976 | goto dropit; | |
977 | } | |
1da177e4 LT |
978 | if (*statp == rpc_success && (xdr = procp->pc_encode) |
979 | && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) { | |
980 | dprintk("svc: failed to encode reply\n"); | |
981 | /* serv->sv_stats->rpcsystemerr++; */ | |
982 | *statp = rpc_system_err; | |
983 | } | |
984 | } else { | |
985 | dprintk("svc: calling dispatcher\n"); | |
986 | if (!versp->vs_dispatch(rqstp, statp)) { | |
987 | /* Release reply info */ | |
988 | if (procp->pc_release) | |
989 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); | |
990 | goto dropit; | |
991 | } | |
992 | } | |
993 | ||
994 | /* Check RPC status result */ | |
995 | if (*statp != rpc_success) | |
996 | resv->iov_len = ((void*)statp) - resv->iov_base + 4; | |
997 | ||
998 | /* Release reply info */ | |
999 | if (procp->pc_release) | |
1000 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); | |
1001 | ||
1002 | if (procp->pc_encode == NULL) | |
1003 | goto dropit; | |
1004 | ||
1005 | sendit: | |
1006 | if (svc_authorise(rqstp)) | |
1007 | goto dropit; | |
1008 | return svc_send(rqstp); | |
1009 | ||
1010 | dropit: | |
1011 | svc_authorise(rqstp); /* doesn't hurt to call this twice */ | |
1012 | dprintk("svc: svc_process dropit\n"); | |
1013 | svc_drop(rqstp); | |
1014 | return 0; | |
1015 | ||
1016 | err_short_len: | |
354ecbb9 DDAG |
1017 | svc_printk(rqstp, "short len %Zd, dropping request\n", |
1018 | argv->iov_len); | |
34e9a63b | 1019 | |
1da177e4 LT |
1020 | goto dropit; /* drop request */ |
1021 | ||
1022 | err_bad_dir: | |
354ecbb9 | 1023 | svc_printk(rqstp, "bad direction %d, dropping request\n", dir); |
34e9a63b | 1024 | |
1da177e4 LT |
1025 | serv->sv_stats->rpcbadfmt++; |
1026 | goto dropit; /* drop request */ | |
1027 | ||
1028 | err_bad_rpc: | |
1029 | serv->sv_stats->rpcbadfmt++; | |
76994313 AD |
1030 | svc_putnl(resv, 1); /* REJECT */ |
1031 | svc_putnl(resv, 0); /* RPC_MISMATCH */ | |
1032 | svc_putnl(resv, 2); /* Only RPCv2 supported */ | |
1033 | svc_putnl(resv, 2); | |
1da177e4 LT |
1034 | goto sendit; |
1035 | ||
1036 | err_bad_auth: | |
1037 | dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat)); | |
1038 | serv->sv_stats->rpcbadauth++; | |
1039 | /* Restore write pointer to location of accept status: */ | |
8f8e05c5 | 1040 | xdr_ressize_check(rqstp, reply_statp); |
76994313 AD |
1041 | svc_putnl(resv, 1); /* REJECT */ |
1042 | svc_putnl(resv, 1); /* AUTH_ERROR */ | |
1043 | svc_putnl(resv, ntohl(auth_stat)); /* status */ | |
1da177e4 LT |
1044 | goto sendit; |
1045 | ||
1046 | err_bad_prog: | |
9ba02638 | 1047 | dprintk("svc: unknown program %d\n", prog); |
1da177e4 | 1048 | serv->sv_stats->rpcbadfmt++; |
76994313 | 1049 | svc_putnl(resv, RPC_PROG_UNAVAIL); |
1da177e4 LT |
1050 | goto sendit; |
1051 | ||
1052 | err_bad_vers: | |
354ecbb9 | 1053 | svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n", |
34e9a63b N |
1054 | vers, prog, progp->pg_name); |
1055 | ||
1da177e4 | 1056 | serv->sv_stats->rpcbadfmt++; |
76994313 AD |
1057 | svc_putnl(resv, RPC_PROG_MISMATCH); |
1058 | svc_putnl(resv, progp->pg_lovers); | |
1059 | svc_putnl(resv, progp->pg_hivers); | |
1da177e4 LT |
1060 | goto sendit; |
1061 | ||
1062 | err_bad_proc: | |
354ecbb9 | 1063 | svc_printk(rqstp, "unknown procedure (%d)\n", proc); |
34e9a63b | 1064 | |
1da177e4 | 1065 | serv->sv_stats->rpcbadfmt++; |
76994313 | 1066 | svc_putnl(resv, RPC_PROC_UNAVAIL); |
1da177e4 LT |
1067 | goto sendit; |
1068 | ||
1069 | err_garbage: | |
354ecbb9 | 1070 | svc_printk(rqstp, "failed to decode args\n"); |
34e9a63b | 1071 | |
1da177e4 LT |
1072 | rpc_stat = rpc_garbage_args; |
1073 | err_bad: | |
1074 | serv->sv_stats->rpcbadfmt++; | |
76994313 | 1075 | svc_putnl(resv, ntohl(rpc_stat)); |
1da177e4 LT |
1076 | goto sendit; |
1077 | } | |
d2f7e79e | 1078 | EXPORT_SYMBOL(svc_process); |
7adae489 GB |
1079 | |
1080 | /* | |
1081 | * Return (transport-specific) limit on the rpc payload. | |
1082 | */ | |
1083 | u32 svc_max_payload(const struct svc_rqst *rqstp) | |
1084 | { | |
49023155 | 1085 | u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload; |
7adae489 | 1086 | |
c6b0a9f8 N |
1087 | if (rqstp->rq_server->sv_max_payload < max) |
1088 | max = rqstp->rq_server->sv_max_payload; | |
7adae489 GB |
1089 | return max; |
1090 | } | |
1091 | EXPORT_SYMBOL_GPL(svc_max_payload); |