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Commit | Line | Data |
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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> | |
1da177e4 LT |
21 | |
22 | #include <linux/sunrpc/types.h> | |
23 | #include <linux/sunrpc/xdr.h> | |
24 | #include <linux/sunrpc/stats.h> | |
25 | #include <linux/sunrpc/svcsock.h> | |
26 | #include <linux/sunrpc/clnt.h> | |
27 | ||
28 | #define RPCDBG_FACILITY RPCDBG_SVCDSP | |
1da177e4 | 29 | |
42a7fc4a GB |
30 | #define svc_serv_is_pooled(serv) ((serv)->sv_function) |
31 | ||
bfd24160 GB |
32 | /* |
33 | * Mode for mapping cpus to pools. | |
34 | */ | |
35 | enum { | |
42a7fc4a | 36 | SVC_POOL_AUTO = -1, /* choose one of the others */ |
bfd24160 GB |
37 | SVC_POOL_GLOBAL, /* no mapping, just a single global pool |
38 | * (legacy & UP mode) */ | |
39 | SVC_POOL_PERCPU, /* one pool per cpu */ | |
40 | SVC_POOL_PERNODE /* one pool per numa node */ | |
41 | }; | |
42a7fc4a | 42 | #define SVC_POOL_DEFAULT SVC_POOL_GLOBAL |
bfd24160 GB |
43 | |
44 | /* | |
45 | * Structure for mapping cpus to pools and vice versa. | |
46 | * Setup once during sunrpc initialisation. | |
47 | */ | |
48 | static struct svc_pool_map { | |
42a7fc4a | 49 | int count; /* How many svc_servs use us */ |
bfd24160 GB |
50 | int mode; /* Note: int not enum to avoid |
51 | * warnings about "enumeration value | |
52 | * not handled in switch" */ | |
53 | unsigned int npools; | |
54 | unsigned int *pool_to; /* maps pool id to cpu or node */ | |
55 | unsigned int *to_pool; /* maps cpu or node to pool id */ | |
56 | } svc_pool_map = { | |
42a7fc4a GB |
57 | .count = 0, |
58 | .mode = SVC_POOL_DEFAULT | |
bfd24160 | 59 | }; |
42a7fc4a GB |
60 | static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */ |
61 | ||
62 | static int | |
63 | param_set_pool_mode(const char *val, struct kernel_param *kp) | |
64 | { | |
65 | int *ip = (int *)kp->arg; | |
66 | struct svc_pool_map *m = &svc_pool_map; | |
67 | int err; | |
68 | ||
69 | mutex_lock(&svc_pool_map_mutex); | |
70 | ||
71 | err = -EBUSY; | |
72 | if (m->count) | |
73 | goto out; | |
74 | ||
75 | err = 0; | |
76 | if (!strncmp(val, "auto", 4)) | |
77 | *ip = SVC_POOL_AUTO; | |
78 | else if (!strncmp(val, "global", 6)) | |
79 | *ip = SVC_POOL_GLOBAL; | |
80 | else if (!strncmp(val, "percpu", 6)) | |
81 | *ip = SVC_POOL_PERCPU; | |
82 | else if (!strncmp(val, "pernode", 7)) | |
83 | *ip = SVC_POOL_PERNODE; | |
84 | else | |
85 | err = -EINVAL; | |
86 | ||
87 | out: | |
88 | mutex_unlock(&svc_pool_map_mutex); | |
89 | return err; | |
90 | } | |
91 | ||
92 | static int | |
93 | param_get_pool_mode(char *buf, struct kernel_param *kp) | |
94 | { | |
95 | int *ip = (int *)kp->arg; | |
96 | ||
97 | switch (*ip) | |
98 | { | |
99 | case SVC_POOL_AUTO: | |
100 | return strlcpy(buf, "auto", 20); | |
101 | case SVC_POOL_GLOBAL: | |
102 | return strlcpy(buf, "global", 20); | |
103 | case SVC_POOL_PERCPU: | |
104 | return strlcpy(buf, "percpu", 20); | |
105 | case SVC_POOL_PERNODE: | |
106 | return strlcpy(buf, "pernode", 20); | |
107 | default: | |
108 | return sprintf(buf, "%d", *ip); | |
109 | } | |
110 | } | |
bfd24160 | 111 | |
42a7fc4a GB |
112 | module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode, |
113 | &svc_pool_map.mode, 0644); | |
bfd24160 GB |
114 | |
115 | /* | |
116 | * Detect best pool mapping mode heuristically, | |
117 | * according to the machine's topology. | |
118 | */ | |
119 | static int | |
120 | svc_pool_map_choose_mode(void) | |
121 | { | |
122 | unsigned int node; | |
123 | ||
124 | if (num_online_nodes() > 1) { | |
125 | /* | |
126 | * Actually have multiple NUMA nodes, | |
127 | * so split pools on NUMA node boundaries | |
128 | */ | |
129 | return SVC_POOL_PERNODE; | |
130 | } | |
131 | ||
132 | node = any_online_node(node_online_map); | |
133 | if (nr_cpus_node(node) > 2) { | |
134 | /* | |
135 | * Non-trivial SMP, or CONFIG_NUMA on | |
136 | * non-NUMA hardware, e.g. with a generic | |
137 | * x86_64 kernel on Xeons. In this case we | |
138 | * want to divide the pools on cpu boundaries. | |
139 | */ | |
140 | return SVC_POOL_PERCPU; | |
141 | } | |
142 | ||
143 | /* default: one global pool */ | |
144 | return SVC_POOL_GLOBAL; | |
145 | } | |
146 | ||
147 | /* | |
148 | * Allocate the to_pool[] and pool_to[] arrays. | |
149 | * Returns 0 on success or an errno. | |
150 | */ | |
151 | static int | |
152 | svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools) | |
153 | { | |
154 | m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); | |
155 | if (!m->to_pool) | |
156 | goto fail; | |
157 | m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); | |
158 | if (!m->pool_to) | |
159 | goto fail_free; | |
160 | ||
161 | return 0; | |
162 | ||
163 | fail_free: | |
164 | kfree(m->to_pool); | |
165 | fail: | |
166 | return -ENOMEM; | |
167 | } | |
168 | ||
169 | /* | |
170 | * Initialise the pool map for SVC_POOL_PERCPU mode. | |
171 | * Returns number of pools or <0 on error. | |
172 | */ | |
173 | static int | |
174 | svc_pool_map_init_percpu(struct svc_pool_map *m) | |
175 | { | |
53b8a315 | 176 | unsigned int maxpools = nr_cpu_ids; |
bfd24160 GB |
177 | unsigned int pidx = 0; |
178 | unsigned int cpu; | |
179 | int err; | |
180 | ||
181 | err = svc_pool_map_alloc_arrays(m, maxpools); | |
182 | if (err) | |
183 | return err; | |
184 | ||
185 | for_each_online_cpu(cpu) { | |
186 | BUG_ON(pidx > maxpools); | |
187 | m->to_pool[cpu] = pidx; | |
188 | m->pool_to[pidx] = cpu; | |
189 | pidx++; | |
190 | } | |
191 | /* cpus brought online later all get mapped to pool0, sorry */ | |
192 | ||
193 | return pidx; | |
194 | }; | |
195 | ||
196 | ||
197 | /* | |
198 | * Initialise the pool map for SVC_POOL_PERNODE mode. | |
199 | * Returns number of pools or <0 on error. | |
200 | */ | |
201 | static int | |
202 | svc_pool_map_init_pernode(struct svc_pool_map *m) | |
203 | { | |
74c7aa8b | 204 | unsigned int maxpools = nr_node_ids; |
bfd24160 GB |
205 | unsigned int pidx = 0; |
206 | unsigned int node; | |
207 | int err; | |
208 | ||
209 | err = svc_pool_map_alloc_arrays(m, maxpools); | |
210 | if (err) | |
211 | return err; | |
212 | ||
213 | for_each_node_with_cpus(node) { | |
214 | /* some architectures (e.g. SN2) have cpuless nodes */ | |
215 | BUG_ON(pidx > maxpools); | |
216 | m->to_pool[node] = pidx; | |
217 | m->pool_to[pidx] = node; | |
218 | pidx++; | |
219 | } | |
220 | /* nodes brought online later all get mapped to pool0, sorry */ | |
221 | ||
222 | return pidx; | |
223 | } | |
224 | ||
225 | ||
226 | /* | |
42a7fc4a GB |
227 | * Add a reference to the global map of cpus to pools (and |
228 | * vice versa). Initialise the map if we're the first user. | |
229 | * Returns the number of pools. | |
bfd24160 GB |
230 | */ |
231 | static unsigned int | |
42a7fc4a | 232 | svc_pool_map_get(void) |
bfd24160 GB |
233 | { |
234 | struct svc_pool_map *m = &svc_pool_map; | |
235 | int npools = -1; | |
236 | ||
42a7fc4a GB |
237 | mutex_lock(&svc_pool_map_mutex); |
238 | ||
239 | if (m->count++) { | |
240 | mutex_unlock(&svc_pool_map_mutex); | |
bfd24160 | 241 | return m->npools; |
42a7fc4a | 242 | } |
bfd24160 | 243 | |
42a7fc4a GB |
244 | if (m->mode == SVC_POOL_AUTO) |
245 | m->mode = svc_pool_map_choose_mode(); | |
bfd24160 GB |
246 | |
247 | switch (m->mode) { | |
248 | case SVC_POOL_PERCPU: | |
249 | npools = svc_pool_map_init_percpu(m); | |
250 | break; | |
251 | case SVC_POOL_PERNODE: | |
252 | npools = svc_pool_map_init_pernode(m); | |
253 | break; | |
254 | } | |
255 | ||
256 | if (npools < 0) { | |
257 | /* default, or memory allocation failure */ | |
258 | npools = 1; | |
259 | m->mode = SVC_POOL_GLOBAL; | |
260 | } | |
261 | m->npools = npools; | |
262 | ||
42a7fc4a | 263 | mutex_unlock(&svc_pool_map_mutex); |
bfd24160 GB |
264 | return m->npools; |
265 | } | |
266 | ||
42a7fc4a GB |
267 | |
268 | /* | |
269 | * Drop a reference to the global map of cpus to pools. | |
270 | * When the last reference is dropped, the map data is | |
271 | * freed; this allows the sysadmin to change the pool | |
272 | * mode using the pool_mode module option without | |
273 | * rebooting or re-loading sunrpc.ko. | |
274 | */ | |
275 | static void | |
276 | svc_pool_map_put(void) | |
277 | { | |
278 | struct svc_pool_map *m = &svc_pool_map; | |
279 | ||
280 | mutex_lock(&svc_pool_map_mutex); | |
281 | ||
282 | if (!--m->count) { | |
283 | m->mode = SVC_POOL_DEFAULT; | |
284 | kfree(m->to_pool); | |
285 | kfree(m->pool_to); | |
286 | m->npools = 0; | |
287 | } | |
288 | ||
289 | mutex_unlock(&svc_pool_map_mutex); | |
290 | } | |
291 | ||
292 | ||
bfd24160 GB |
293 | /* |
294 | * Set the current thread's cpus_allowed mask so that it | |
295 | * will only run on cpus in the given pool. | |
296 | * | |
297 | * Returns 1 and fills in oldmask iff a cpumask was applied. | |
298 | */ | |
299 | static inline int | |
300 | svc_pool_map_set_cpumask(unsigned int pidx, cpumask_t *oldmask) | |
301 | { | |
302 | struct svc_pool_map *m = &svc_pool_map; | |
bfd24160 GB |
303 | |
304 | /* | |
305 | * The caller checks for sv_nrpools > 1, which | |
42a7fc4a | 306 | * implies that we've been initialized. |
bfd24160 | 307 | */ |
42a7fc4a | 308 | BUG_ON(m->count == 0); |
bfd24160 GB |
309 | |
310 | switch (m->mode) | |
311 | { | |
312 | default: | |
313 | return 0; | |
314 | case SVC_POOL_PERCPU: | |
c5f59f08 MT |
315 | { |
316 | unsigned int cpu = m->pool_to[pidx]; | |
317 | ||
bfd24160 | 318 | *oldmask = current->cpus_allowed; |
c5f59f08 | 319 | set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu)); |
bfd24160 | 320 | return 1; |
c5f59f08 | 321 | } |
bfd24160 | 322 | case SVC_POOL_PERNODE: |
c5f59f08 MT |
323 | { |
324 | unsigned int node = m->pool_to[pidx]; | |
325 | node_to_cpumask_ptr(nodecpumask, node); | |
326 | ||
bfd24160 | 327 | *oldmask = current->cpus_allowed; |
c5f59f08 | 328 | set_cpus_allowed_ptr(current, nodecpumask); |
bfd24160 GB |
329 | return 1; |
330 | } | |
c5f59f08 | 331 | } |
bfd24160 GB |
332 | } |
333 | ||
334 | /* | |
335 | * Use the mapping mode to choose a pool for a given CPU. | |
336 | * Used when enqueueing an incoming RPC. Always returns | |
337 | * a non-NULL pool pointer. | |
338 | */ | |
339 | struct svc_pool * | |
340 | svc_pool_for_cpu(struct svc_serv *serv, int cpu) | |
341 | { | |
342 | struct svc_pool_map *m = &svc_pool_map; | |
343 | unsigned int pidx = 0; | |
344 | ||
345 | /* | |
42a7fc4a | 346 | * An uninitialised map happens in a pure client when |
bfd24160 GB |
347 | * lockd is brought up, so silently treat it the |
348 | * same as SVC_POOL_GLOBAL. | |
349 | */ | |
42a7fc4a GB |
350 | if (svc_serv_is_pooled(serv)) { |
351 | switch (m->mode) { | |
352 | case SVC_POOL_PERCPU: | |
353 | pidx = m->to_pool[cpu]; | |
354 | break; | |
355 | case SVC_POOL_PERNODE: | |
356 | pidx = m->to_pool[cpu_to_node(cpu)]; | |
357 | break; | |
358 | } | |
bfd24160 GB |
359 | } |
360 | return &serv->sv_pools[pidx % serv->sv_nrpools]; | |
361 | } | |
362 | ||
363 | ||
1da177e4 LT |
364 | /* |
365 | * Create an RPC service | |
366 | */ | |
a7455442 GB |
367 | static struct svc_serv * |
368 | __svc_create(struct svc_program *prog, unsigned int bufsize, int npools, | |
bc591ccf | 369 | void (*shutdown)(struct svc_serv *serv)) |
1da177e4 LT |
370 | { |
371 | struct svc_serv *serv; | |
ea339d46 | 372 | unsigned int vers; |
1da177e4 | 373 | unsigned int xdrsize; |
3262c816 | 374 | unsigned int i; |
1da177e4 | 375 | |
0da974f4 | 376 | if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL))) |
1da177e4 | 377 | return NULL; |
9ba02638 | 378 | serv->sv_name = prog->pg_name; |
1da177e4 LT |
379 | serv->sv_program = prog; |
380 | serv->sv_nrthreads = 1; | |
381 | serv->sv_stats = prog->pg_stats; | |
c6b0a9f8 N |
382 | if (bufsize > RPCSVC_MAXPAYLOAD) |
383 | bufsize = RPCSVC_MAXPAYLOAD; | |
384 | serv->sv_max_payload = bufsize? bufsize : 4096; | |
385 | serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE); | |
bc591ccf | 386 | serv->sv_shutdown = shutdown; |
1da177e4 | 387 | xdrsize = 0; |
9ba02638 AG |
388 | while (prog) { |
389 | prog->pg_lovers = prog->pg_nvers-1; | |
390 | for (vers=0; vers<prog->pg_nvers ; vers++) | |
391 | if (prog->pg_vers[vers]) { | |
392 | prog->pg_hivers = vers; | |
393 | if (prog->pg_lovers > vers) | |
394 | prog->pg_lovers = vers; | |
395 | if (prog->pg_vers[vers]->vs_xdrsize > xdrsize) | |
396 | xdrsize = prog->pg_vers[vers]->vs_xdrsize; | |
397 | } | |
398 | prog = prog->pg_next; | |
399 | } | |
1da177e4 | 400 | serv->sv_xdrsize = xdrsize; |
1da177e4 LT |
401 | INIT_LIST_HEAD(&serv->sv_tempsocks); |
402 | INIT_LIST_HEAD(&serv->sv_permsocks); | |
36bdfc8b | 403 | init_timer(&serv->sv_temptimer); |
1da177e4 LT |
404 | spin_lock_init(&serv->sv_lock); |
405 | ||
a7455442 | 406 | serv->sv_nrpools = npools; |
3262c816 | 407 | serv->sv_pools = |
cd861280 | 408 | kcalloc(serv->sv_nrpools, sizeof(struct svc_pool), |
3262c816 GB |
409 | GFP_KERNEL); |
410 | if (!serv->sv_pools) { | |
411 | kfree(serv); | |
412 | return NULL; | |
413 | } | |
414 | ||
415 | for (i = 0; i < serv->sv_nrpools; i++) { | |
416 | struct svc_pool *pool = &serv->sv_pools[i]; | |
417 | ||
46121cf7 | 418 | dprintk("svc: initialising pool %u for %s\n", |
3262c816 GB |
419 | i, serv->sv_name); |
420 | ||
421 | pool->sp_id = i; | |
422 | INIT_LIST_HEAD(&pool->sp_threads); | |
423 | INIT_LIST_HEAD(&pool->sp_sockets); | |
a7455442 | 424 | INIT_LIST_HEAD(&pool->sp_all_threads); |
3262c816 GB |
425 | spin_lock_init(&pool->sp_lock); |
426 | } | |
427 | ||
428 | ||
1da177e4 LT |
429 | /* Remove any stale portmap registrations */ |
430 | svc_register(serv, 0, 0); | |
431 | ||
432 | return serv; | |
433 | } | |
434 | ||
a7455442 GB |
435 | struct svc_serv * |
436 | svc_create(struct svc_program *prog, unsigned int bufsize, | |
437 | void (*shutdown)(struct svc_serv *serv)) | |
438 | { | |
439 | return __svc_create(prog, bufsize, /*npools*/1, shutdown); | |
440 | } | |
d2f7e79e | 441 | EXPORT_SYMBOL(svc_create); |
a7455442 GB |
442 | |
443 | struct svc_serv * | |
444 | svc_create_pooled(struct svc_program *prog, unsigned int bufsize, | |
445 | void (*shutdown)(struct svc_serv *serv), | |
446 | svc_thread_fn func, int sig, struct module *mod) | |
447 | { | |
448 | struct svc_serv *serv; | |
42a7fc4a | 449 | unsigned int npools = svc_pool_map_get(); |
a7455442 | 450 | |
bfd24160 | 451 | serv = __svc_create(prog, bufsize, npools, shutdown); |
a7455442 GB |
452 | |
453 | if (serv != NULL) { | |
454 | serv->sv_function = func; | |
455 | serv->sv_kill_signal = sig; | |
456 | serv->sv_module = mod; | |
457 | } | |
458 | ||
459 | return serv; | |
460 | } | |
d2f7e79e | 461 | EXPORT_SYMBOL(svc_create_pooled); |
a7455442 | 462 | |
1da177e4 | 463 | /* |
bedbdd8b NB |
464 | * Destroy an RPC service. Should be called with appropriate locking to |
465 | * protect the sv_nrthreads, sv_permsocks and sv_tempsocks. | |
1da177e4 LT |
466 | */ |
467 | void | |
468 | svc_destroy(struct svc_serv *serv) | |
469 | { | |
46121cf7 | 470 | dprintk("svc: svc_destroy(%s, %d)\n", |
1da177e4 LT |
471 | serv->sv_program->pg_name, |
472 | serv->sv_nrthreads); | |
473 | ||
474 | if (serv->sv_nrthreads) { | |
475 | if (--(serv->sv_nrthreads) != 0) { | |
476 | svc_sock_update_bufs(serv); | |
477 | return; | |
478 | } | |
479 | } else | |
480 | printk("svc_destroy: no threads for serv=%p!\n", serv); | |
481 | ||
36bdfc8b GB |
482 | del_timer_sync(&serv->sv_temptimer); |
483 | ||
7a182083 | 484 | svc_close_all(&serv->sv_tempsocks); |
cda1fd4a | 485 | |
bc591ccf N |
486 | if (serv->sv_shutdown) |
487 | serv->sv_shutdown(serv); | |
488 | ||
7a182083 | 489 | svc_close_all(&serv->sv_permsocks); |
cda1fd4a N |
490 | |
491 | BUG_ON(!list_empty(&serv->sv_permsocks)); | |
492 | BUG_ON(!list_empty(&serv->sv_tempsocks)); | |
cca5172a | 493 | |
1da177e4 LT |
494 | cache_clean_deferred(serv); |
495 | ||
42a7fc4a GB |
496 | if (svc_serv_is_pooled(serv)) |
497 | svc_pool_map_put(); | |
498 | ||
1da177e4 LT |
499 | /* Unregister service with the portmapper */ |
500 | svc_register(serv, 0, 0); | |
3262c816 | 501 | kfree(serv->sv_pools); |
1da177e4 LT |
502 | kfree(serv); |
503 | } | |
d2f7e79e | 504 | EXPORT_SYMBOL(svc_destroy); |
1da177e4 LT |
505 | |
506 | /* | |
507 | * Allocate an RPC server's buffer space. | |
508 | * We allocate pages and place them in rq_argpages. | |
509 | */ | |
510 | static int | |
511 | svc_init_buffer(struct svc_rqst *rqstp, unsigned int size) | |
512 | { | |
0dc220f0 | 513 | unsigned int pages, arghi; |
cca5172a | 514 | |
c6b0a9f8 N |
515 | pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply. |
516 | * We assume one is at most one page | |
517 | */ | |
1da177e4 | 518 | arghi = 0; |
09a62660 | 519 | BUG_ON(pages > RPCSVC_MAXPAGES); |
1da177e4 LT |
520 | while (pages) { |
521 | struct page *p = alloc_page(GFP_KERNEL); | |
522 | if (!p) | |
523 | break; | |
44524359 | 524 | rqstp->rq_pages[arghi++] = p; |
1da177e4 LT |
525 | pages--; |
526 | } | |
0dc220f0 | 527 | return pages == 0; |
1da177e4 LT |
528 | } |
529 | ||
530 | /* | |
531 | * Release an RPC server buffer | |
532 | */ | |
533 | static void | |
534 | svc_release_buffer(struct svc_rqst *rqstp) | |
535 | { | |
50c8bb13 CL |
536 | unsigned int i; |
537 | ||
538 | for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++) | |
44524359 N |
539 | if (rqstp->rq_pages[i]) |
540 | put_page(rqstp->rq_pages[i]); | |
1da177e4 LT |
541 | } |
542 | ||
0113ab34 JL |
543 | struct svc_rqst * |
544 | svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool) | |
1da177e4 LT |
545 | { |
546 | struct svc_rqst *rqstp; | |
1da177e4 | 547 | |
0da974f4 | 548 | rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL); |
1da177e4 | 549 | if (!rqstp) |
0113ab34 | 550 | goto out_enomem; |
1da177e4 | 551 | |
1da177e4 LT |
552 | init_waitqueue_head(&rqstp->rq_wait); |
553 | ||
1da177e4 | 554 | serv->sv_nrthreads++; |
3262c816 GB |
555 | spin_lock_bh(&pool->sp_lock); |
556 | pool->sp_nrthreads++; | |
a7455442 | 557 | list_add(&rqstp->rq_all, &pool->sp_all_threads); |
3262c816 | 558 | spin_unlock_bh(&pool->sp_lock); |
1da177e4 | 559 | rqstp->rq_server = serv; |
3262c816 | 560 | rqstp->rq_pool = pool; |
bfd24160 | 561 | |
0113ab34 JL |
562 | rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); |
563 | if (!rqstp->rq_argp) | |
564 | goto out_thread; | |
565 | ||
566 | rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); | |
567 | if (!rqstp->rq_resp) | |
568 | goto out_thread; | |
569 | ||
570 | if (!svc_init_buffer(rqstp, serv->sv_max_mesg)) | |
571 | goto out_thread; | |
572 | ||
573 | return rqstp; | |
574 | out_thread: | |
575 | svc_exit_thread(rqstp); | |
576 | out_enomem: | |
577 | return ERR_PTR(-ENOMEM); | |
578 | } | |
579 | EXPORT_SYMBOL(svc_prepare_thread); | |
580 | ||
581 | /* | |
bedbdd8b NB |
582 | * Create a thread in the given pool. Caller must hold BKL or another lock to |
583 | * serialize access to the svc_serv struct. On a NUMA or SMP machine, with a | |
584 | * multi-pool serv, the thread will be restricted to run on the cpus belonging | |
585 | * to the pool. | |
0113ab34 JL |
586 | */ |
587 | static int | |
588 | __svc_create_thread(svc_thread_fn func, struct svc_serv *serv, | |
589 | struct svc_pool *pool) | |
590 | { | |
591 | struct svc_rqst *rqstp; | |
592 | int error = -ENOMEM; | |
593 | int have_oldmask = 0; | |
c3bb257d | 594 | cpumask_t uninitialized_var(oldmask); |
0113ab34 JL |
595 | |
596 | rqstp = svc_prepare_thread(serv, pool); | |
597 | if (IS_ERR(rqstp)) { | |
598 | error = PTR_ERR(rqstp); | |
599 | goto out; | |
600 | } | |
601 | ||
bfd24160 GB |
602 | if (serv->sv_nrpools > 1) |
603 | have_oldmask = svc_pool_map_set_cpumask(pool->sp_id, &oldmask); | |
604 | ||
1da177e4 | 605 | error = kernel_thread((int (*)(void *)) func, rqstp, 0); |
bfd24160 GB |
606 | |
607 | if (have_oldmask) | |
608 | set_cpus_allowed(current, oldmask); | |
609 | ||
1da177e4 LT |
610 | if (error < 0) |
611 | goto out_thread; | |
612 | svc_sock_update_bufs(serv); | |
613 | error = 0; | |
614 | out: | |
615 | return error; | |
616 | ||
617 | out_thread: | |
618 | svc_exit_thread(rqstp); | |
619 | goto out; | |
620 | } | |
621 | ||
a7455442 GB |
622 | /* |
623 | * Choose a pool in which to create a new thread, for svc_set_num_threads | |
624 | */ | |
625 | static inline struct svc_pool * | |
626 | choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) | |
627 | { | |
628 | if (pool != NULL) | |
629 | return pool; | |
630 | ||
cca5172a | 631 | return &serv->sv_pools[(*state)++ % serv->sv_nrpools]; |
a7455442 GB |
632 | } |
633 | ||
634 | /* | |
635 | * Choose a thread to kill, for svc_set_num_threads | |
636 | */ | |
637 | static inline struct task_struct * | |
638 | choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) | |
639 | { | |
640 | unsigned int i; | |
641 | struct task_struct *task = NULL; | |
642 | ||
643 | if (pool != NULL) { | |
644 | spin_lock_bh(&pool->sp_lock); | |
645 | } else { | |
646 | /* choose a pool in round-robin fashion */ | |
cca5172a YH |
647 | for (i = 0; i < serv->sv_nrpools; i++) { |
648 | pool = &serv->sv_pools[--(*state) % serv->sv_nrpools]; | |
a7455442 | 649 | spin_lock_bh(&pool->sp_lock); |
cca5172a YH |
650 | if (!list_empty(&pool->sp_all_threads)) |
651 | goto found_pool; | |
a7455442 | 652 | spin_unlock_bh(&pool->sp_lock); |
cca5172a | 653 | } |
a7455442 GB |
654 | return NULL; |
655 | } | |
656 | ||
657 | found_pool: | |
658 | if (!list_empty(&pool->sp_all_threads)) { | |
659 | struct svc_rqst *rqstp; | |
660 | ||
661 | /* | |
662 | * Remove from the pool->sp_all_threads list | |
663 | * so we don't try to kill it again. | |
664 | */ | |
665 | rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all); | |
666 | list_del_init(&rqstp->rq_all); | |
667 | task = rqstp->rq_task; | |
cca5172a | 668 | } |
a7455442 GB |
669 | spin_unlock_bh(&pool->sp_lock); |
670 | ||
671 | return task; | |
672 | } | |
673 | ||
674 | /* | |
675 | * Create or destroy enough new threads to make the number | |
676 | * of threads the given number. If `pool' is non-NULL, applies | |
677 | * only to threads in that pool, otherwise round-robins between | |
678 | * all pools. Must be called with a svc_get() reference and | |
bedbdd8b | 679 | * the BKL or another lock to protect access to svc_serv fields. |
a7455442 GB |
680 | * |
681 | * Destroying threads relies on the service threads filling in | |
682 | * rqstp->rq_task, which only the nfs ones do. Assumes the serv | |
683 | * has been created using svc_create_pooled(). | |
684 | * | |
685 | * Based on code that used to be in nfsd_svc() but tweaked | |
686 | * to be pool-aware. | |
687 | */ | |
688 | int | |
689 | svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) | |
690 | { | |
691 | struct task_struct *victim; | |
692 | int error = 0; | |
693 | unsigned int state = serv->sv_nrthreads-1; | |
694 | ||
695 | if (pool == NULL) { | |
696 | /* The -1 assumes caller has done a svc_get() */ | |
697 | nrservs -= (serv->sv_nrthreads-1); | |
698 | } else { | |
699 | spin_lock_bh(&pool->sp_lock); | |
700 | nrservs -= pool->sp_nrthreads; | |
701 | spin_unlock_bh(&pool->sp_lock); | |
702 | } | |
703 | ||
704 | /* create new threads */ | |
705 | while (nrservs > 0) { | |
706 | nrservs--; | |
707 | __module_get(serv->sv_module); | |
708 | error = __svc_create_thread(serv->sv_function, serv, | |
709 | choose_pool(serv, pool, &state)); | |
710 | if (error < 0) { | |
711 | module_put(serv->sv_module); | |
712 | break; | |
713 | } | |
714 | } | |
715 | /* destroy old threads */ | |
716 | while (nrservs < 0 && | |
717 | (victim = choose_victim(serv, pool, &state)) != NULL) { | |
718 | send_sig(serv->sv_kill_signal, victim, 1); | |
719 | nrservs++; | |
720 | } | |
721 | ||
722 | return error; | |
723 | } | |
d2f7e79e | 724 | EXPORT_SYMBOL(svc_set_num_threads); |
a7455442 | 725 | |
3262c816 | 726 | /* |
bedbdd8b NB |
727 | * Called from a server thread as it's exiting. Caller must hold the BKL or |
728 | * the "service mutex", whichever is appropriate for the service. | |
1da177e4 LT |
729 | */ |
730 | void | |
731 | svc_exit_thread(struct svc_rqst *rqstp) | |
732 | { | |
733 | struct svc_serv *serv = rqstp->rq_server; | |
3262c816 | 734 | struct svc_pool *pool = rqstp->rq_pool; |
1da177e4 LT |
735 | |
736 | svc_release_buffer(rqstp); | |
a51482bd JJ |
737 | kfree(rqstp->rq_resp); |
738 | kfree(rqstp->rq_argp); | |
739 | kfree(rqstp->rq_auth_data); | |
3262c816 GB |
740 | |
741 | spin_lock_bh(&pool->sp_lock); | |
742 | pool->sp_nrthreads--; | |
a7455442 | 743 | list_del(&rqstp->rq_all); |
3262c816 GB |
744 | spin_unlock_bh(&pool->sp_lock); |
745 | ||
1da177e4 LT |
746 | kfree(rqstp); |
747 | ||
748 | /* Release the server */ | |
749 | if (serv) | |
750 | svc_destroy(serv); | |
751 | } | |
d2f7e79e | 752 | EXPORT_SYMBOL(svc_exit_thread); |
1da177e4 LT |
753 | |
754 | /* | |
755 | * Register an RPC service with the local portmapper. | |
cca5172a | 756 | * To unregister a service, call this routine with |
1da177e4 LT |
757 | * proto and port == 0. |
758 | */ | |
759 | int | |
760 | svc_register(struct svc_serv *serv, int proto, unsigned short port) | |
761 | { | |
762 | struct svc_program *progp; | |
763 | unsigned long flags; | |
ea339d46 CL |
764 | unsigned int i; |
765 | int error = 0, dummy; | |
1da177e4 | 766 | |
1da177e4 LT |
767 | if (!port) |
768 | clear_thread_flag(TIF_SIGPENDING); | |
769 | ||
bc5fea42 OK |
770 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { |
771 | for (i = 0; i < progp->pg_nvers; i++) { | |
772 | if (progp->pg_vers[i] == NULL) | |
773 | continue; | |
774 | ||
46121cf7 | 775 | dprintk("svc: svc_register(%s, %s, %d, %d)%s\n", |
bc5fea42 OK |
776 | progp->pg_name, |
777 | proto == IPPROTO_UDP? "udp" : "tcp", | |
778 | port, | |
779 | i, | |
780 | progp->pg_vers[i]->vs_hidden? | |
781 | " (but not telling portmap)" : ""); | |
782 | ||
783 | if (progp->pg_vers[i]->vs_hidden) | |
784 | continue; | |
785 | ||
26080014 | 786 | error = rpcb_register(progp->pg_prog, i, proto, port, &dummy); |
bc5fea42 OK |
787 | if (error < 0) |
788 | break; | |
789 | if (port && !dummy) { | |
790 | error = -EACCES; | |
791 | break; | |
792 | } | |
1da177e4 LT |
793 | } |
794 | } | |
795 | ||
796 | if (!port) { | |
797 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
798 | recalc_sigpending(); | |
799 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
800 | } | |
801 | ||
802 | return error; | |
803 | } | |
804 | ||
354ecbb9 DDAG |
805 | /* |
806 | * Printk the given error with the address of the client that caused it. | |
807 | */ | |
808 | static int | |
809 | __attribute__ ((format (printf, 2, 3))) | |
810 | svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) | |
811 | { | |
812 | va_list args; | |
813 | int r; | |
814 | char buf[RPC_MAX_ADDRBUFLEN]; | |
815 | ||
816 | if (!net_ratelimit()) | |
817 | return 0; | |
818 | ||
819 | printk(KERN_WARNING "svc: %s: ", | |
820 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
821 | ||
822 | va_start(args, fmt); | |
823 | r = vprintk(fmt, args); | |
824 | va_end(args); | |
825 | ||
826 | return r; | |
827 | } | |
828 | ||
1da177e4 LT |
829 | /* |
830 | * Process the RPC request. | |
831 | */ | |
832 | int | |
6fb2b47f | 833 | svc_process(struct svc_rqst *rqstp) |
1da177e4 LT |
834 | { |
835 | struct svc_program *progp; | |
836 | struct svc_version *versp = NULL; /* compiler food */ | |
837 | struct svc_procedure *procp = NULL; | |
838 | struct kvec * argv = &rqstp->rq_arg.head[0]; | |
839 | struct kvec * resv = &rqstp->rq_res.head[0]; | |
6fb2b47f | 840 | struct svc_serv *serv = rqstp->rq_server; |
1da177e4 | 841 | kxdrproc_t xdr; |
d8ed029d AD |
842 | __be32 *statp; |
843 | u32 dir, prog, vers, proc; | |
844 | __be32 auth_stat, rpc_stat; | |
1da177e4 | 845 | int auth_res; |
8f8e05c5 | 846 | __be32 *reply_statp; |
1da177e4 LT |
847 | |
848 | rpc_stat = rpc_success; | |
849 | ||
850 | if (argv->iov_len < 6*4) | |
851 | goto err_short_len; | |
852 | ||
853 | /* setup response xdr_buf. | |
cca5172a | 854 | * Initially it has just one page |
1da177e4 | 855 | */ |
44524359 | 856 | rqstp->rq_resused = 1; |
1da177e4 LT |
857 | resv->iov_base = page_address(rqstp->rq_respages[0]); |
858 | resv->iov_len = 0; | |
44524359 | 859 | rqstp->rq_res.pages = rqstp->rq_respages + 1; |
1da177e4 LT |
860 | rqstp->rq_res.len = 0; |
861 | rqstp->rq_res.page_base = 0; | |
862 | rqstp->rq_res.page_len = 0; | |
334ccfd5 | 863 | rqstp->rq_res.buflen = PAGE_SIZE; |
7c9fdcfb | 864 | rqstp->rq_res.tail[0].iov_base = NULL; |
1da177e4 | 865 | rqstp->rq_res.tail[0].iov_len = 0; |
5c04c46a | 866 | /* Will be turned off only in gss privacy case: */ |
cf8208d0 | 867 | rqstp->rq_splice_ok = 1; |
e831fe65 TT |
868 | |
869 | /* Setup reply header */ | |
870 | rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp); | |
1da177e4 LT |
871 | |
872 | rqstp->rq_xid = svc_getu32(argv); | |
873 | svc_putu32(resv, rqstp->rq_xid); | |
874 | ||
76994313 AD |
875 | dir = svc_getnl(argv); |
876 | vers = svc_getnl(argv); | |
1da177e4 LT |
877 | |
878 | /* First words of reply: */ | |
76994313 | 879 | svc_putnl(resv, 1); /* REPLY */ |
1da177e4 LT |
880 | |
881 | if (dir != 0) /* direction != CALL */ | |
882 | goto err_bad_dir; | |
883 | if (vers != 2) /* RPC version number */ | |
884 | goto err_bad_rpc; | |
885 | ||
886 | /* Save position in case we later decide to reject: */ | |
8f8e05c5 | 887 | reply_statp = resv->iov_base + resv->iov_len; |
1da177e4 | 888 | |
76994313 | 889 | svc_putnl(resv, 0); /* ACCEPT */ |
1da177e4 | 890 | |
76994313 AD |
891 | rqstp->rq_prog = prog = svc_getnl(argv); /* program number */ |
892 | rqstp->rq_vers = vers = svc_getnl(argv); /* version number */ | |
893 | rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */ | |
1da177e4 LT |
894 | |
895 | progp = serv->sv_program; | |
80d188a6 N |
896 | |
897 | for (progp = serv->sv_program; progp; progp = progp->pg_next) | |
898 | if (prog == progp->pg_prog) | |
899 | break; | |
900 | ||
1da177e4 LT |
901 | /* |
902 | * Decode auth data, and add verifier to reply buffer. | |
903 | * We do this before anything else in order to get a decent | |
904 | * auth verifier. | |
905 | */ | |
906 | auth_res = svc_authenticate(rqstp, &auth_stat); | |
907 | /* Also give the program a chance to reject this call: */ | |
80d188a6 | 908 | if (auth_res == SVC_OK && progp) { |
1da177e4 LT |
909 | auth_stat = rpc_autherr_badcred; |
910 | auth_res = progp->pg_authenticate(rqstp); | |
911 | } | |
912 | switch (auth_res) { | |
913 | case SVC_OK: | |
914 | break; | |
915 | case SVC_GARBAGE: | |
dd35210e | 916 | goto err_garbage; |
1da177e4 LT |
917 | case SVC_SYSERR: |
918 | rpc_stat = rpc_system_err; | |
919 | goto err_bad; | |
920 | case SVC_DENIED: | |
921 | goto err_bad_auth; | |
922 | case SVC_DROP: | |
923 | goto dropit; | |
924 | case SVC_COMPLETE: | |
925 | goto sendit; | |
926 | } | |
80d188a6 | 927 | |
9ba02638 | 928 | if (progp == NULL) |
1da177e4 LT |
929 | goto err_bad_prog; |
930 | ||
931 | if (vers >= progp->pg_nvers || | |
932 | !(versp = progp->pg_vers[vers])) | |
933 | goto err_bad_vers; | |
934 | ||
935 | procp = versp->vs_proc + proc; | |
936 | if (proc >= versp->vs_nproc || !procp->pc_func) | |
937 | goto err_bad_proc; | |
938 | rqstp->rq_server = serv; | |
939 | rqstp->rq_procinfo = procp; | |
940 | ||
941 | /* Syntactic check complete */ | |
942 | serv->sv_stats->rpccnt++; | |
943 | ||
944 | /* Build the reply header. */ | |
945 | statp = resv->iov_base +resv->iov_len; | |
76994313 | 946 | svc_putnl(resv, RPC_SUCCESS); |
1da177e4 LT |
947 | |
948 | /* Bump per-procedure stats counter */ | |
949 | procp->pc_count++; | |
950 | ||
951 | /* Initialize storage for argp and resp */ | |
952 | memset(rqstp->rq_argp, 0, procp->pc_argsize); | |
953 | memset(rqstp->rq_resp, 0, procp->pc_ressize); | |
954 | ||
cca5172a | 955 | /* un-reserve some of the out-queue now that we have a |
1da177e4 LT |
956 | * better idea of reply size |
957 | */ | |
958 | if (procp->pc_xdrressize) | |
cd123012 | 959 | svc_reserve_auth(rqstp, procp->pc_xdrressize<<2); |
1da177e4 LT |
960 | |
961 | /* Call the function that processes the request. */ | |
962 | if (!versp->vs_dispatch) { | |
963 | /* Decode arguments */ | |
964 | xdr = procp->pc_decode; | |
965 | if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp)) | |
966 | goto err_garbage; | |
967 | ||
968 | *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
969 | ||
970 | /* Encode reply */ | |
d343fce1 N |
971 | if (*statp == rpc_drop_reply) { |
972 | if (procp->pc_release) | |
973 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); | |
974 | goto dropit; | |
975 | } | |
1da177e4 LT |
976 | if (*statp == rpc_success && (xdr = procp->pc_encode) |
977 | && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) { | |
978 | dprintk("svc: failed to encode reply\n"); | |
979 | /* serv->sv_stats->rpcsystemerr++; */ | |
980 | *statp = rpc_system_err; | |
981 | } | |
982 | } else { | |
983 | dprintk("svc: calling dispatcher\n"); | |
984 | if (!versp->vs_dispatch(rqstp, statp)) { | |
985 | /* Release reply info */ | |
986 | if (procp->pc_release) | |
987 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); | |
988 | goto dropit; | |
989 | } | |
990 | } | |
991 | ||
992 | /* Check RPC status result */ | |
993 | if (*statp != rpc_success) | |
994 | resv->iov_len = ((void*)statp) - resv->iov_base + 4; | |
995 | ||
996 | /* Release reply info */ | |
997 | if (procp->pc_release) | |
998 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); | |
999 | ||
1000 | if (procp->pc_encode == NULL) | |
1001 | goto dropit; | |
1002 | ||
1003 | sendit: | |
1004 | if (svc_authorise(rqstp)) | |
1005 | goto dropit; | |
1006 | return svc_send(rqstp); | |
1007 | ||
1008 | dropit: | |
1009 | svc_authorise(rqstp); /* doesn't hurt to call this twice */ | |
1010 | dprintk("svc: svc_process dropit\n"); | |
1011 | svc_drop(rqstp); | |
1012 | return 0; | |
1013 | ||
1014 | err_short_len: | |
354ecbb9 DDAG |
1015 | svc_printk(rqstp, "short len %Zd, dropping request\n", |
1016 | argv->iov_len); | |
34e9a63b | 1017 | |
1da177e4 LT |
1018 | goto dropit; /* drop request */ |
1019 | ||
1020 | err_bad_dir: | |
354ecbb9 | 1021 | svc_printk(rqstp, "bad direction %d, dropping request\n", dir); |
34e9a63b | 1022 | |
1da177e4 LT |
1023 | serv->sv_stats->rpcbadfmt++; |
1024 | goto dropit; /* drop request */ | |
1025 | ||
1026 | err_bad_rpc: | |
1027 | serv->sv_stats->rpcbadfmt++; | |
76994313 AD |
1028 | svc_putnl(resv, 1); /* REJECT */ |
1029 | svc_putnl(resv, 0); /* RPC_MISMATCH */ | |
1030 | svc_putnl(resv, 2); /* Only RPCv2 supported */ | |
1031 | svc_putnl(resv, 2); | |
1da177e4 LT |
1032 | goto sendit; |
1033 | ||
1034 | err_bad_auth: | |
1035 | dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat)); | |
1036 | serv->sv_stats->rpcbadauth++; | |
1037 | /* Restore write pointer to location of accept status: */ | |
8f8e05c5 | 1038 | xdr_ressize_check(rqstp, reply_statp); |
76994313 AD |
1039 | svc_putnl(resv, 1); /* REJECT */ |
1040 | svc_putnl(resv, 1); /* AUTH_ERROR */ | |
1041 | svc_putnl(resv, ntohl(auth_stat)); /* status */ | |
1da177e4 LT |
1042 | goto sendit; |
1043 | ||
1044 | err_bad_prog: | |
9ba02638 | 1045 | dprintk("svc: unknown program %d\n", prog); |
1da177e4 | 1046 | serv->sv_stats->rpcbadfmt++; |
76994313 | 1047 | svc_putnl(resv, RPC_PROG_UNAVAIL); |
1da177e4 LT |
1048 | goto sendit; |
1049 | ||
1050 | err_bad_vers: | |
354ecbb9 | 1051 | svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n", |
34e9a63b N |
1052 | vers, prog, progp->pg_name); |
1053 | ||
1da177e4 | 1054 | serv->sv_stats->rpcbadfmt++; |
76994313 AD |
1055 | svc_putnl(resv, RPC_PROG_MISMATCH); |
1056 | svc_putnl(resv, progp->pg_lovers); | |
1057 | svc_putnl(resv, progp->pg_hivers); | |
1da177e4 LT |
1058 | goto sendit; |
1059 | ||
1060 | err_bad_proc: | |
354ecbb9 | 1061 | svc_printk(rqstp, "unknown procedure (%d)\n", proc); |
34e9a63b | 1062 | |
1da177e4 | 1063 | serv->sv_stats->rpcbadfmt++; |
76994313 | 1064 | svc_putnl(resv, RPC_PROC_UNAVAIL); |
1da177e4 LT |
1065 | goto sendit; |
1066 | ||
1067 | err_garbage: | |
354ecbb9 | 1068 | svc_printk(rqstp, "failed to decode args\n"); |
34e9a63b | 1069 | |
1da177e4 LT |
1070 | rpc_stat = rpc_garbage_args; |
1071 | err_bad: | |
1072 | serv->sv_stats->rpcbadfmt++; | |
76994313 | 1073 | svc_putnl(resv, ntohl(rpc_stat)); |
1da177e4 LT |
1074 | goto sendit; |
1075 | } | |
d2f7e79e | 1076 | EXPORT_SYMBOL(svc_process); |
7adae489 GB |
1077 | |
1078 | /* | |
1079 | * Return (transport-specific) limit on the rpc payload. | |
1080 | */ | |
1081 | u32 svc_max_payload(const struct svc_rqst *rqstp) | |
1082 | { | |
49023155 | 1083 | u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload; |
7adae489 | 1084 | |
c6b0a9f8 N |
1085 | if (rqstp->rq_server->sv_max_payload < max) |
1086 | max = rqstp->rq_server->sv_max_payload; | |
7adae489 GB |
1087 | return max; |
1088 | } | |
1089 | EXPORT_SYMBOL_GPL(svc_max_payload); |