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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> | |
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 | { |
aa85ea5b | 315 | set_cpus_allowed_ptr(task, cpumask_of(node)); |
9867d76c | 316 | break; |
c5f59f08 | 317 | } |
bfd24160 | 318 | case SVC_POOL_PERNODE: |
c5f59f08 | 319 | { |
a70f7302 | 320 | set_cpus_allowed_ptr(task, cpumask_of_node(node)); |
9867d76c | 321 | break; |
bfd24160 | 322 | } |
c5f59f08 | 323 | } |
bfd24160 GB |
324 | } |
325 | ||
326 | /* | |
327 | * Use the mapping mode to choose a pool for a given CPU. | |
328 | * Used when enqueueing an incoming RPC. Always returns | |
329 | * a non-NULL pool pointer. | |
330 | */ | |
331 | struct svc_pool * | |
332 | svc_pool_for_cpu(struct svc_serv *serv, int cpu) | |
333 | { | |
334 | struct svc_pool_map *m = &svc_pool_map; | |
335 | unsigned int pidx = 0; | |
336 | ||
337 | /* | |
42a7fc4a | 338 | * An uninitialised map happens in a pure client when |
bfd24160 GB |
339 | * lockd is brought up, so silently treat it the |
340 | * same as SVC_POOL_GLOBAL. | |
341 | */ | |
42a7fc4a GB |
342 | if (svc_serv_is_pooled(serv)) { |
343 | switch (m->mode) { | |
344 | case SVC_POOL_PERCPU: | |
345 | pidx = m->to_pool[cpu]; | |
346 | break; | |
347 | case SVC_POOL_PERNODE: | |
348 | pidx = m->to_pool[cpu_to_node(cpu)]; | |
349 | break; | |
350 | } | |
bfd24160 GB |
351 | } |
352 | return &serv->sv_pools[pidx % serv->sv_nrpools]; | |
353 | } | |
354 | ||
355 | ||
1da177e4 LT |
356 | /* |
357 | * Create an RPC service | |
358 | */ | |
a7455442 GB |
359 | static struct svc_serv * |
360 | __svc_create(struct svc_program *prog, unsigned int bufsize, int npools, | |
49a9072f | 361 | void (*shutdown)(struct svc_serv *serv)) |
1da177e4 LT |
362 | { |
363 | struct svc_serv *serv; | |
ea339d46 | 364 | unsigned int vers; |
1da177e4 | 365 | unsigned int xdrsize; |
3262c816 | 366 | unsigned int i; |
1da177e4 | 367 | |
0da974f4 | 368 | if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL))) |
1da177e4 | 369 | return NULL; |
9ba02638 | 370 | serv->sv_name = prog->pg_name; |
1da177e4 LT |
371 | serv->sv_program = prog; |
372 | serv->sv_nrthreads = 1; | |
373 | serv->sv_stats = prog->pg_stats; | |
c6b0a9f8 N |
374 | if (bufsize > RPCSVC_MAXPAYLOAD) |
375 | bufsize = RPCSVC_MAXPAYLOAD; | |
376 | serv->sv_max_payload = bufsize? bufsize : 4096; | |
377 | serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE); | |
bc591ccf | 378 | serv->sv_shutdown = shutdown; |
1da177e4 | 379 | xdrsize = 0; |
9ba02638 AG |
380 | while (prog) { |
381 | prog->pg_lovers = prog->pg_nvers-1; | |
382 | for (vers=0; vers<prog->pg_nvers ; vers++) | |
383 | if (prog->pg_vers[vers]) { | |
384 | prog->pg_hivers = vers; | |
385 | if (prog->pg_lovers > vers) | |
386 | prog->pg_lovers = vers; | |
387 | if (prog->pg_vers[vers]->vs_xdrsize > xdrsize) | |
388 | xdrsize = prog->pg_vers[vers]->vs_xdrsize; | |
389 | } | |
390 | prog = prog->pg_next; | |
391 | } | |
1da177e4 | 392 | serv->sv_xdrsize = xdrsize; |
1da177e4 LT |
393 | INIT_LIST_HEAD(&serv->sv_tempsocks); |
394 | INIT_LIST_HEAD(&serv->sv_permsocks); | |
36bdfc8b | 395 | init_timer(&serv->sv_temptimer); |
1da177e4 LT |
396 | spin_lock_init(&serv->sv_lock); |
397 | ||
a7455442 | 398 | serv->sv_nrpools = npools; |
3262c816 | 399 | serv->sv_pools = |
cd861280 | 400 | kcalloc(serv->sv_nrpools, sizeof(struct svc_pool), |
3262c816 GB |
401 | GFP_KERNEL); |
402 | if (!serv->sv_pools) { | |
403 | kfree(serv); | |
404 | return NULL; | |
405 | } | |
406 | ||
407 | for (i = 0; i < serv->sv_nrpools; i++) { | |
408 | struct svc_pool *pool = &serv->sv_pools[i]; | |
409 | ||
46121cf7 | 410 | dprintk("svc: initialising pool %u for %s\n", |
3262c816 GB |
411 | i, serv->sv_name); |
412 | ||
413 | pool->sp_id = i; | |
414 | INIT_LIST_HEAD(&pool->sp_threads); | |
415 | INIT_LIST_HEAD(&pool->sp_sockets); | |
a7455442 | 416 | INIT_LIST_HEAD(&pool->sp_all_threads); |
3262c816 GB |
417 | spin_lock_init(&pool->sp_lock); |
418 | } | |
419 | ||
1da177e4 | 420 | /* Remove any stale portmap registrations */ |
7252d575 | 421 | svc_unregister(serv); |
1da177e4 LT |
422 | |
423 | return serv; | |
424 | } | |
425 | ||
a7455442 GB |
426 | struct svc_serv * |
427 | svc_create(struct svc_program *prog, unsigned int bufsize, | |
49a9072f | 428 | void (*shutdown)(struct svc_serv *serv)) |
a7455442 | 429 | { |
49a9072f | 430 | return __svc_create(prog, bufsize, /*npools*/1, shutdown); |
a7455442 | 431 | } |
24c3767e | 432 | EXPORT_SYMBOL_GPL(svc_create); |
a7455442 GB |
433 | |
434 | struct svc_serv * | |
435 | svc_create_pooled(struct svc_program *prog, unsigned int bufsize, | |
49a9072f | 436 | void (*shutdown)(struct svc_serv *serv), |
a75c5d01 | 437 | svc_thread_fn func, struct module *mod) |
a7455442 GB |
438 | { |
439 | struct svc_serv *serv; | |
42a7fc4a | 440 | unsigned int npools = svc_pool_map_get(); |
a7455442 | 441 | |
49a9072f | 442 | serv = __svc_create(prog, bufsize, npools, shutdown); |
a7455442 GB |
443 | |
444 | if (serv != NULL) { | |
445 | serv->sv_function = func; | |
a7455442 GB |
446 | serv->sv_module = mod; |
447 | } | |
448 | ||
449 | return serv; | |
450 | } | |
24c3767e | 451 | EXPORT_SYMBOL_GPL(svc_create_pooled); |
a7455442 | 452 | |
1da177e4 | 453 | /* |
bedbdd8b NB |
454 | * Destroy an RPC service. Should be called with appropriate locking to |
455 | * protect the sv_nrthreads, sv_permsocks and sv_tempsocks. | |
1da177e4 LT |
456 | */ |
457 | void | |
458 | svc_destroy(struct svc_serv *serv) | |
459 | { | |
46121cf7 | 460 | dprintk("svc: svc_destroy(%s, %d)\n", |
1da177e4 LT |
461 | serv->sv_program->pg_name, |
462 | serv->sv_nrthreads); | |
463 | ||
464 | if (serv->sv_nrthreads) { | |
465 | if (--(serv->sv_nrthreads) != 0) { | |
466 | svc_sock_update_bufs(serv); | |
467 | return; | |
468 | } | |
469 | } else | |
470 | printk("svc_destroy: no threads for serv=%p!\n", serv); | |
471 | ||
36bdfc8b GB |
472 | del_timer_sync(&serv->sv_temptimer); |
473 | ||
7a182083 | 474 | svc_close_all(&serv->sv_tempsocks); |
cda1fd4a | 475 | |
bc591ccf N |
476 | if (serv->sv_shutdown) |
477 | serv->sv_shutdown(serv); | |
478 | ||
7a182083 | 479 | svc_close_all(&serv->sv_permsocks); |
cda1fd4a N |
480 | |
481 | BUG_ON(!list_empty(&serv->sv_permsocks)); | |
482 | BUG_ON(!list_empty(&serv->sv_tempsocks)); | |
cca5172a | 483 | |
1da177e4 LT |
484 | cache_clean_deferred(serv); |
485 | ||
42a7fc4a GB |
486 | if (svc_serv_is_pooled(serv)) |
487 | svc_pool_map_put(); | |
488 | ||
7252d575 | 489 | svc_unregister(serv); |
3262c816 | 490 | kfree(serv->sv_pools); |
1da177e4 LT |
491 | kfree(serv); |
492 | } | |
24c3767e | 493 | EXPORT_SYMBOL_GPL(svc_destroy); |
1da177e4 LT |
494 | |
495 | /* | |
496 | * Allocate an RPC server's buffer space. | |
497 | * We allocate pages and place them in rq_argpages. | |
498 | */ | |
499 | static int | |
500 | svc_init_buffer(struct svc_rqst *rqstp, unsigned int size) | |
501 | { | |
0dc220f0 | 502 | unsigned int pages, arghi; |
cca5172a | 503 | |
c6b0a9f8 N |
504 | pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply. |
505 | * We assume one is at most one page | |
506 | */ | |
1da177e4 | 507 | arghi = 0; |
09a62660 | 508 | BUG_ON(pages > RPCSVC_MAXPAGES); |
1da177e4 LT |
509 | while (pages) { |
510 | struct page *p = alloc_page(GFP_KERNEL); | |
511 | if (!p) | |
512 | break; | |
44524359 | 513 | rqstp->rq_pages[arghi++] = p; |
1da177e4 LT |
514 | pages--; |
515 | } | |
0dc220f0 | 516 | return pages == 0; |
1da177e4 LT |
517 | } |
518 | ||
519 | /* | |
520 | * Release an RPC server buffer | |
521 | */ | |
522 | static void | |
523 | svc_release_buffer(struct svc_rqst *rqstp) | |
524 | { | |
50c8bb13 CL |
525 | unsigned int i; |
526 | ||
527 | for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++) | |
44524359 N |
528 | if (rqstp->rq_pages[i]) |
529 | put_page(rqstp->rq_pages[i]); | |
1da177e4 LT |
530 | } |
531 | ||
0113ab34 JL |
532 | struct svc_rqst * |
533 | svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool) | |
1da177e4 LT |
534 | { |
535 | struct svc_rqst *rqstp; | |
1da177e4 | 536 | |
0da974f4 | 537 | rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL); |
1da177e4 | 538 | if (!rqstp) |
0113ab34 | 539 | goto out_enomem; |
1da177e4 | 540 | |
1da177e4 LT |
541 | init_waitqueue_head(&rqstp->rq_wait); |
542 | ||
1da177e4 | 543 | serv->sv_nrthreads++; |
3262c816 GB |
544 | spin_lock_bh(&pool->sp_lock); |
545 | pool->sp_nrthreads++; | |
a7455442 | 546 | list_add(&rqstp->rq_all, &pool->sp_all_threads); |
3262c816 | 547 | spin_unlock_bh(&pool->sp_lock); |
1da177e4 | 548 | rqstp->rq_server = serv; |
3262c816 | 549 | rqstp->rq_pool = pool; |
bfd24160 | 550 | |
0113ab34 JL |
551 | rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); |
552 | if (!rqstp->rq_argp) | |
553 | goto out_thread; | |
554 | ||
555 | rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); | |
556 | if (!rqstp->rq_resp) | |
557 | goto out_thread; | |
558 | ||
559 | if (!svc_init_buffer(rqstp, serv->sv_max_mesg)) | |
560 | goto out_thread; | |
561 | ||
562 | return rqstp; | |
563 | out_thread: | |
564 | svc_exit_thread(rqstp); | |
565 | out_enomem: | |
566 | return ERR_PTR(-ENOMEM); | |
567 | } | |
24c3767e | 568 | EXPORT_SYMBOL_GPL(svc_prepare_thread); |
0113ab34 | 569 | |
a7455442 GB |
570 | /* |
571 | * Choose a pool in which to create a new thread, for svc_set_num_threads | |
572 | */ | |
573 | static inline struct svc_pool * | |
574 | choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) | |
575 | { | |
576 | if (pool != NULL) | |
577 | return pool; | |
578 | ||
cca5172a | 579 | return &serv->sv_pools[(*state)++ % serv->sv_nrpools]; |
a7455442 GB |
580 | } |
581 | ||
582 | /* | |
583 | * Choose a thread to kill, for svc_set_num_threads | |
584 | */ | |
585 | static inline struct task_struct * | |
586 | choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) | |
587 | { | |
588 | unsigned int i; | |
589 | struct task_struct *task = NULL; | |
590 | ||
591 | if (pool != NULL) { | |
592 | spin_lock_bh(&pool->sp_lock); | |
593 | } else { | |
594 | /* choose a pool in round-robin fashion */ | |
cca5172a YH |
595 | for (i = 0; i < serv->sv_nrpools; i++) { |
596 | pool = &serv->sv_pools[--(*state) % serv->sv_nrpools]; | |
a7455442 | 597 | spin_lock_bh(&pool->sp_lock); |
cca5172a YH |
598 | if (!list_empty(&pool->sp_all_threads)) |
599 | goto found_pool; | |
a7455442 | 600 | spin_unlock_bh(&pool->sp_lock); |
cca5172a | 601 | } |
a7455442 GB |
602 | return NULL; |
603 | } | |
604 | ||
605 | found_pool: | |
606 | if (!list_empty(&pool->sp_all_threads)) { | |
607 | struct svc_rqst *rqstp; | |
608 | ||
609 | /* | |
610 | * Remove from the pool->sp_all_threads list | |
611 | * so we don't try to kill it again. | |
612 | */ | |
613 | rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all); | |
614 | list_del_init(&rqstp->rq_all); | |
615 | task = rqstp->rq_task; | |
cca5172a | 616 | } |
a7455442 GB |
617 | spin_unlock_bh(&pool->sp_lock); |
618 | ||
619 | return task; | |
620 | } | |
621 | ||
622 | /* | |
623 | * Create or destroy enough new threads to make the number | |
624 | * of threads the given number. If `pool' is non-NULL, applies | |
625 | * only to threads in that pool, otherwise round-robins between | |
626 | * all pools. Must be called with a svc_get() reference and | |
bedbdd8b | 627 | * the BKL or another lock to protect access to svc_serv fields. |
a7455442 GB |
628 | * |
629 | * Destroying threads relies on the service threads filling in | |
630 | * rqstp->rq_task, which only the nfs ones do. Assumes the serv | |
631 | * has been created using svc_create_pooled(). | |
632 | * | |
633 | * Based on code that used to be in nfsd_svc() but tweaked | |
634 | * to be pool-aware. | |
635 | */ | |
636 | int | |
637 | svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) | |
638 | { | |
9867d76c JL |
639 | struct svc_rqst *rqstp; |
640 | struct task_struct *task; | |
641 | struct svc_pool *chosen_pool; | |
a7455442 GB |
642 | int error = 0; |
643 | unsigned int state = serv->sv_nrthreads-1; | |
644 | ||
645 | if (pool == NULL) { | |
646 | /* The -1 assumes caller has done a svc_get() */ | |
647 | nrservs -= (serv->sv_nrthreads-1); | |
648 | } else { | |
649 | spin_lock_bh(&pool->sp_lock); | |
650 | nrservs -= pool->sp_nrthreads; | |
651 | spin_unlock_bh(&pool->sp_lock); | |
652 | } | |
653 | ||
654 | /* create new threads */ | |
655 | while (nrservs > 0) { | |
656 | nrservs--; | |
9867d76c JL |
657 | chosen_pool = choose_pool(serv, pool, &state); |
658 | ||
659 | rqstp = svc_prepare_thread(serv, chosen_pool); | |
660 | if (IS_ERR(rqstp)) { | |
661 | error = PTR_ERR(rqstp); | |
662 | break; | |
663 | } | |
664 | ||
a7455442 | 665 | __module_get(serv->sv_module); |
9867d76c JL |
666 | task = kthread_create(serv->sv_function, rqstp, serv->sv_name); |
667 | if (IS_ERR(task)) { | |
668 | error = PTR_ERR(task); | |
a7455442 | 669 | module_put(serv->sv_module); |
9867d76c | 670 | svc_exit_thread(rqstp); |
a7455442 GB |
671 | break; |
672 | } | |
9867d76c JL |
673 | |
674 | rqstp->rq_task = task; | |
675 | if (serv->sv_nrpools > 1) | |
676 | svc_pool_map_set_cpumask(task, chosen_pool->sp_id); | |
677 | ||
678 | svc_sock_update_bufs(serv); | |
679 | wake_up_process(task); | |
a7455442 GB |
680 | } |
681 | /* destroy old threads */ | |
682 | while (nrservs < 0 && | |
9867d76c | 683 | (task = choose_victim(serv, pool, &state)) != NULL) { |
a75c5d01 | 684 | send_sig(SIGINT, task, 1); |
a7455442 GB |
685 | nrservs++; |
686 | } | |
687 | ||
688 | return error; | |
689 | } | |
24c3767e | 690 | EXPORT_SYMBOL_GPL(svc_set_num_threads); |
a7455442 | 691 | |
3262c816 | 692 | /* |
bedbdd8b NB |
693 | * Called from a server thread as it's exiting. Caller must hold the BKL or |
694 | * the "service mutex", whichever is appropriate for the service. | |
1da177e4 LT |
695 | */ |
696 | void | |
697 | svc_exit_thread(struct svc_rqst *rqstp) | |
698 | { | |
699 | struct svc_serv *serv = rqstp->rq_server; | |
3262c816 | 700 | struct svc_pool *pool = rqstp->rq_pool; |
1da177e4 LT |
701 | |
702 | svc_release_buffer(rqstp); | |
a51482bd JJ |
703 | kfree(rqstp->rq_resp); |
704 | kfree(rqstp->rq_argp); | |
705 | kfree(rqstp->rq_auth_data); | |
3262c816 GB |
706 | |
707 | spin_lock_bh(&pool->sp_lock); | |
708 | pool->sp_nrthreads--; | |
a7455442 | 709 | list_del(&rqstp->rq_all); |
3262c816 GB |
710 | spin_unlock_bh(&pool->sp_lock); |
711 | ||
1da177e4 LT |
712 | kfree(rqstp); |
713 | ||
714 | /* Release the server */ | |
715 | if (serv) | |
716 | svc_destroy(serv); | |
717 | } | |
24c3767e | 718 | EXPORT_SYMBOL_GPL(svc_exit_thread); |
1da177e4 LT |
719 | |
720 | /* | |
2c7eb0b2 CL |
721 | * Register an "inet" protocol family netid with the local |
722 | * rpcbind daemon via an rpcbind v4 SET request. | |
a26cfad6 | 723 | * |
2c7eb0b2 CL |
724 | * No netconfig infrastructure is available in the kernel, so |
725 | * we map IP_ protocol numbers to netids by hand. | |
a26cfad6 | 726 | * |
2c7eb0b2 CL |
727 | * Returns zero on success; a negative errno value is returned |
728 | * if any error occurs. | |
1da177e4 | 729 | */ |
2c7eb0b2 CL |
730 | static int __svc_rpcb_register4(const u32 program, const u32 version, |
731 | const unsigned short protocol, | |
732 | const unsigned short port) | |
a26cfad6 | 733 | { |
cadc0fa5 | 734 | const struct sockaddr_in sin = { |
a26cfad6 CL |
735 | .sin_family = AF_INET, |
736 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
737 | .sin_port = htons(port), | |
738 | }; | |
cadc0fa5 CL |
739 | const char *netid; |
740 | int error; | |
2c7eb0b2 CL |
741 | |
742 | switch (protocol) { | |
743 | case IPPROTO_UDP: | |
744 | netid = RPCBIND_NETID_UDP; | |
745 | break; | |
746 | case IPPROTO_TCP: | |
747 | netid = RPCBIND_NETID_TCP; | |
748 | break; | |
749 | default: | |
ba5c35e0 | 750 | return -ENOPROTOOPT; |
2c7eb0b2 CL |
751 | } |
752 | ||
cadc0fa5 CL |
753 | error = rpcb_v4_register(program, version, |
754 | (const struct sockaddr *)&sin, netid); | |
755 | ||
756 | /* | |
757 | * User space didn't support rpcbind v4, so retry this | |
758 | * registration request with the legacy rpcbind v2 protocol. | |
759 | */ | |
760 | if (error == -EPROTONOSUPPORT) | |
761 | error = rpcb_register(program, version, protocol, port); | |
762 | ||
763 | return error; | |
2c7eb0b2 CL |
764 | } |
765 | ||
cadc0fa5 | 766 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
2c7eb0b2 CL |
767 | /* |
768 | * Register an "inet6" protocol family netid with the local | |
769 | * rpcbind daemon via an rpcbind v4 SET request. | |
770 | * | |
771 | * No netconfig infrastructure is available in the kernel, so | |
772 | * we map IP_ protocol numbers to netids by hand. | |
773 | * | |
774 | * Returns zero on success; a negative errno value is returned | |
775 | * if any error occurs. | |
776 | */ | |
777 | static int __svc_rpcb_register6(const u32 program, const u32 version, | |
778 | const unsigned short protocol, | |
779 | const unsigned short port) | |
780 | { | |
cadc0fa5 | 781 | const struct sockaddr_in6 sin6 = { |
a26cfad6 CL |
782 | .sin6_family = AF_INET6, |
783 | .sin6_addr = IN6ADDR_ANY_INIT, | |
784 | .sin6_port = htons(port), | |
785 | }; | |
cadc0fa5 CL |
786 | const char *netid; |
787 | int error; | |
a26cfad6 | 788 | |
2c7eb0b2 CL |
789 | switch (protocol) { |
790 | case IPPROTO_UDP: | |
791 | netid = RPCBIND_NETID_UDP6; | |
a26cfad6 | 792 | break; |
2c7eb0b2 | 793 | case IPPROTO_TCP: |
a26cfad6 | 794 | netid = RPCBIND_NETID_TCP6; |
a26cfad6 CL |
795 | break; |
796 | default: | |
ba5c35e0 | 797 | return -ENOPROTOOPT; |
2c7eb0b2 CL |
798 | } |
799 | ||
cadc0fa5 CL |
800 | error = rpcb_v4_register(program, version, |
801 | (const struct sockaddr *)&sin6, netid); | |
802 | ||
803 | /* | |
804 | * User space didn't support rpcbind version 4, so we won't | |
805 | * use a PF_INET6 listener. | |
806 | */ | |
807 | if (error == -EPROTONOSUPPORT) | |
808 | error = -EAFNOSUPPORT; | |
809 | ||
810 | return error; | |
2c7eb0b2 | 811 | } |
cadc0fa5 | 812 | #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ |
2c7eb0b2 CL |
813 | |
814 | /* | |
815 | * Register a kernel RPC service via rpcbind version 4. | |
816 | * | |
817 | * Returns zero on success; a negative errno value is returned | |
818 | * if any error occurs. | |
819 | */ | |
363f724c CL |
820 | static int __svc_register(const char *progname, |
821 | const u32 program, const u32 version, | |
4b62e58c | 822 | const int family, |
2c7eb0b2 CL |
823 | const unsigned short protocol, |
824 | const unsigned short port) | |
825 | { | |
363f724c | 826 | int error = -EAFNOSUPPORT; |
2c7eb0b2 CL |
827 | |
828 | switch (family) { | |
4b62e58c | 829 | case PF_INET: |
363f724c | 830 | error = __svc_rpcb_register4(program, version, |
2c7eb0b2 | 831 | protocol, port); |
cadc0fa5 CL |
832 | break; |
833 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
4b62e58c | 834 | case PF_INET6: |
2c7eb0b2 CL |
835 | error = __svc_rpcb_register6(program, version, |
836 | protocol, port); | |
cadc0fa5 | 837 | #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ |
a26cfad6 CL |
838 | } |
839 | ||
363f724c CL |
840 | if (error < 0) |
841 | printk(KERN_WARNING "svc: failed to register %sv%u RPC " | |
842 | "service (errno %d).\n", progname, version, -error); | |
843 | return error; | |
a26cfad6 | 844 | } |
2c7eb0b2 | 845 | |
a26cfad6 CL |
846 | /** |
847 | * svc_register - register an RPC service with the local portmapper | |
848 | * @serv: svc_serv struct for the service to register | |
4b62e58c | 849 | * @family: protocol family of service's listener socket |
a26cfad6 CL |
850 | * @proto: transport protocol number to advertise |
851 | * @port: port to advertise | |
852 | * | |
4b62e58c | 853 | * Service is registered for any address in the passed-in protocol family |
a26cfad6 | 854 | */ |
4b62e58c CL |
855 | int svc_register(const struct svc_serv *serv, const int family, |
856 | const unsigned short proto, const unsigned short port) | |
1da177e4 LT |
857 | { |
858 | struct svc_program *progp; | |
ea339d46 | 859 | unsigned int i; |
14aeb211 | 860 | int error = 0; |
1da177e4 | 861 | |
7252d575 | 862 | BUG_ON(proto == 0 && port == 0); |
1da177e4 | 863 | |
bc5fea42 OK |
864 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { |
865 | for (i = 0; i < progp->pg_nvers; i++) { | |
866 | if (progp->pg_vers[i] == NULL) | |
867 | continue; | |
868 | ||
2c7eb0b2 | 869 | dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n", |
bc5fea42 | 870 | progp->pg_name, |
2c7eb0b2 | 871 | i, |
bc5fea42 OK |
872 | proto == IPPROTO_UDP? "udp" : "tcp", |
873 | port, | |
4b62e58c | 874 | family, |
bc5fea42 OK |
875 | progp->pg_vers[i]->vs_hidden? |
876 | " (but not telling portmap)" : ""); | |
877 | ||
878 | if (progp->pg_vers[i]->vs_hidden) | |
879 | continue; | |
880 | ||
363f724c CL |
881 | error = __svc_register(progp->pg_name, progp->pg_prog, |
882 | i, family, proto, port); | |
bc5fea42 OK |
883 | if (error < 0) |
884 | break; | |
1da177e4 LT |
885 | } |
886 | } | |
887 | ||
7252d575 CL |
888 | return error; |
889 | } | |
890 | ||
d5a8620f CL |
891 | /* |
892 | * If user space is running rpcbind, it should take the v4 UNSET | |
893 | * and clear everything for this [program, version]. If user space | |
894 | * is running portmap, it will reject the v4 UNSET, but won't have | |
895 | * any "inet6" entries anyway. So a PMAP_UNSET should be sufficient | |
896 | * in this case to clear all existing entries for [program, version]. | |
897 | */ | |
f6fb3f6f CL |
898 | static void __svc_unregister(const u32 program, const u32 version, |
899 | const char *progname) | |
900 | { | |
f6fb3f6f CL |
901 | int error; |
902 | ||
d5a8620f | 903 | error = rpcb_v4_register(program, version, NULL, ""); |
f6fb3f6f | 904 | |
d5a8620f CL |
905 | /* |
906 | * User space didn't support rpcbind v4, so retry this | |
907 | * request with the legacy rpcbind v2 protocol. | |
908 | */ | |
909 | if (error == -EPROTONOSUPPORT) | |
910 | error = rpcb_register(program, version, 0, 0); | |
f6fb3f6f | 911 | |
f6fb3f6f CL |
912 | dprintk("svc: %s(%sv%u), error %d\n", |
913 | __func__, progname, version, error); | |
914 | } | |
915 | ||
7252d575 | 916 | /* |
f6fb3f6f CL |
917 | * All netids, bind addresses and ports registered for [program, version] |
918 | * are removed from the local rpcbind database (if the service is not | |
919 | * hidden) to make way for a new instance of the service. | |
7252d575 | 920 | * |
f6fb3f6f CL |
921 | * The result of unregistration is reported via dprintk for those who want |
922 | * verification of the result, but is otherwise not important. | |
7252d575 CL |
923 | */ |
924 | static void svc_unregister(const struct svc_serv *serv) | |
925 | { | |
926 | struct svc_program *progp; | |
927 | unsigned long flags; | |
928 | unsigned int i; | |
7252d575 CL |
929 | |
930 | clear_thread_flag(TIF_SIGPENDING); | |
931 | ||
932 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { | |
933 | for (i = 0; i < progp->pg_nvers; i++) { | |
934 | if (progp->pg_vers[i] == NULL) | |
935 | continue; | |
936 | if (progp->pg_vers[i]->vs_hidden) | |
937 | continue; | |
938 | ||
f6fb3f6f | 939 | __svc_unregister(progp->pg_prog, i, progp->pg_name); |
7252d575 | 940 | } |
1da177e4 LT |
941 | } |
942 | ||
7252d575 CL |
943 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
944 | recalc_sigpending(); | |
945 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
1da177e4 LT |
946 | } |
947 | ||
354ecbb9 DDAG |
948 | /* |
949 | * Printk the given error with the address of the client that caused it. | |
950 | */ | |
951 | static int | |
952 | __attribute__ ((format (printf, 2, 3))) | |
953 | svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) | |
954 | { | |
955 | va_list args; | |
956 | int r; | |
957 | char buf[RPC_MAX_ADDRBUFLEN]; | |
958 | ||
959 | if (!net_ratelimit()) | |
960 | return 0; | |
961 | ||
962 | printk(KERN_WARNING "svc: %s: ", | |
963 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
964 | ||
965 | va_start(args, fmt); | |
966 | r = vprintk(fmt, args); | |
967 | va_end(args); | |
968 | ||
969 | return r; | |
970 | } | |
971 | ||
1da177e4 LT |
972 | /* |
973 | * Process the RPC request. | |
974 | */ | |
975 | int | |
6fb2b47f | 976 | svc_process(struct svc_rqst *rqstp) |
1da177e4 LT |
977 | { |
978 | struct svc_program *progp; | |
979 | struct svc_version *versp = NULL; /* compiler food */ | |
980 | struct svc_procedure *procp = NULL; | |
981 | struct kvec * argv = &rqstp->rq_arg.head[0]; | |
982 | struct kvec * resv = &rqstp->rq_res.head[0]; | |
6fb2b47f | 983 | struct svc_serv *serv = rqstp->rq_server; |
1da177e4 | 984 | kxdrproc_t xdr; |
d8ed029d AD |
985 | __be32 *statp; |
986 | u32 dir, prog, vers, proc; | |
987 | __be32 auth_stat, rpc_stat; | |
1da177e4 | 988 | int auth_res; |
8f8e05c5 | 989 | __be32 *reply_statp; |
1da177e4 LT |
990 | |
991 | rpc_stat = rpc_success; | |
992 | ||
993 | if (argv->iov_len < 6*4) | |
994 | goto err_short_len; | |
995 | ||
996 | /* setup response xdr_buf. | |
cca5172a | 997 | * Initially it has just one page |
1da177e4 | 998 | */ |
44524359 | 999 | rqstp->rq_resused = 1; |
1da177e4 LT |
1000 | resv->iov_base = page_address(rqstp->rq_respages[0]); |
1001 | resv->iov_len = 0; | |
44524359 | 1002 | rqstp->rq_res.pages = rqstp->rq_respages + 1; |
1da177e4 LT |
1003 | rqstp->rq_res.len = 0; |
1004 | rqstp->rq_res.page_base = 0; | |
1005 | rqstp->rq_res.page_len = 0; | |
334ccfd5 | 1006 | rqstp->rq_res.buflen = PAGE_SIZE; |
7c9fdcfb | 1007 | rqstp->rq_res.tail[0].iov_base = NULL; |
1da177e4 | 1008 | rqstp->rq_res.tail[0].iov_len = 0; |
5c04c46a | 1009 | /* Will be turned off only in gss privacy case: */ |
cf8208d0 | 1010 | rqstp->rq_splice_ok = 1; |
2f425878 AA |
1011 | /* Will be turned off only when NFSv4 Sessions are used */ |
1012 | rqstp->rq_usedeferral = 1; | |
e831fe65 TT |
1013 | |
1014 | /* Setup reply header */ | |
1015 | rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp); | |
1da177e4 LT |
1016 | |
1017 | rqstp->rq_xid = svc_getu32(argv); | |
1018 | svc_putu32(resv, rqstp->rq_xid); | |
1019 | ||
76994313 AD |
1020 | dir = svc_getnl(argv); |
1021 | vers = svc_getnl(argv); | |
1da177e4 LT |
1022 | |
1023 | /* First words of reply: */ | |
76994313 | 1024 | svc_putnl(resv, 1); /* REPLY */ |
1da177e4 LT |
1025 | |
1026 | if (dir != 0) /* direction != CALL */ | |
1027 | goto err_bad_dir; | |
1028 | if (vers != 2) /* RPC version number */ | |
1029 | goto err_bad_rpc; | |
1030 | ||
1031 | /* Save position in case we later decide to reject: */ | |
8f8e05c5 | 1032 | reply_statp = resv->iov_base + resv->iov_len; |
1da177e4 | 1033 | |
76994313 | 1034 | svc_putnl(resv, 0); /* ACCEPT */ |
1da177e4 | 1035 | |
76994313 AD |
1036 | rqstp->rq_prog = prog = svc_getnl(argv); /* program number */ |
1037 | rqstp->rq_vers = vers = svc_getnl(argv); /* version number */ | |
1038 | rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */ | |
1da177e4 LT |
1039 | |
1040 | progp = serv->sv_program; | |
80d188a6 N |
1041 | |
1042 | for (progp = serv->sv_program; progp; progp = progp->pg_next) | |
1043 | if (prog == progp->pg_prog) | |
1044 | break; | |
1045 | ||
1da177e4 LT |
1046 | /* |
1047 | * Decode auth data, and add verifier to reply buffer. | |
1048 | * We do this before anything else in order to get a decent | |
1049 | * auth verifier. | |
1050 | */ | |
1051 | auth_res = svc_authenticate(rqstp, &auth_stat); | |
1052 | /* Also give the program a chance to reject this call: */ | |
80d188a6 | 1053 | if (auth_res == SVC_OK && progp) { |
1da177e4 LT |
1054 | auth_stat = rpc_autherr_badcred; |
1055 | auth_res = progp->pg_authenticate(rqstp); | |
1056 | } | |
1057 | switch (auth_res) { | |
1058 | case SVC_OK: | |
1059 | break; | |
1060 | case SVC_GARBAGE: | |
dd35210e | 1061 | goto err_garbage; |
1da177e4 LT |
1062 | case SVC_SYSERR: |
1063 | rpc_stat = rpc_system_err; | |
1064 | goto err_bad; | |
1065 | case SVC_DENIED: | |
1066 | goto err_bad_auth; | |
1067 | case SVC_DROP: | |
1068 | goto dropit; | |
1069 | case SVC_COMPLETE: | |
1070 | goto sendit; | |
1071 | } | |
80d188a6 | 1072 | |
9ba02638 | 1073 | if (progp == NULL) |
1da177e4 LT |
1074 | goto err_bad_prog; |
1075 | ||
1076 | if (vers >= progp->pg_nvers || | |
1077 | !(versp = progp->pg_vers[vers])) | |
1078 | goto err_bad_vers; | |
1079 | ||
1080 | procp = versp->vs_proc + proc; | |
1081 | if (proc >= versp->vs_nproc || !procp->pc_func) | |
1082 | goto err_bad_proc; | |
1da177e4 LT |
1083 | rqstp->rq_procinfo = procp; |
1084 | ||
1085 | /* Syntactic check complete */ | |
1086 | serv->sv_stats->rpccnt++; | |
1087 | ||
1088 | /* Build the reply header. */ | |
1089 | statp = resv->iov_base +resv->iov_len; | |
76994313 | 1090 | svc_putnl(resv, RPC_SUCCESS); |
1da177e4 LT |
1091 | |
1092 | /* Bump per-procedure stats counter */ | |
1093 | procp->pc_count++; | |
1094 | ||
1095 | /* Initialize storage for argp and resp */ | |
1096 | memset(rqstp->rq_argp, 0, procp->pc_argsize); | |
1097 | memset(rqstp->rq_resp, 0, procp->pc_ressize); | |
1098 | ||
cca5172a | 1099 | /* un-reserve some of the out-queue now that we have a |
1da177e4 LT |
1100 | * better idea of reply size |
1101 | */ | |
1102 | if (procp->pc_xdrressize) | |
cd123012 | 1103 | svc_reserve_auth(rqstp, procp->pc_xdrressize<<2); |
1da177e4 LT |
1104 | |
1105 | /* Call the function that processes the request. */ | |
1106 | if (!versp->vs_dispatch) { | |
1107 | /* Decode arguments */ | |
1108 | xdr = procp->pc_decode; | |
1109 | if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp)) | |
1110 | goto err_garbage; | |
1111 | ||
1112 | *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
1113 | ||
1114 | /* Encode reply */ | |
d343fce1 N |
1115 | if (*statp == rpc_drop_reply) { |
1116 | if (procp->pc_release) | |
1117 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); | |
1118 | goto dropit; | |
1119 | } | |
1da177e4 LT |
1120 | if (*statp == rpc_success && (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 svc_send(rqstp); | |
1151 | ||
1152 | dropit: | |
1153 | svc_authorise(rqstp); /* doesn't hurt to call this twice */ | |
1154 | dprintk("svc: svc_process dropit\n"); | |
1155 | svc_drop(rqstp); | |
1156 | return 0; | |
1157 | ||
1158 | err_short_len: | |
354ecbb9 DDAG |
1159 | svc_printk(rqstp, "short len %Zd, dropping request\n", |
1160 | argv->iov_len); | |
34e9a63b | 1161 | |
1da177e4 LT |
1162 | goto dropit; /* drop request */ |
1163 | ||
1164 | err_bad_dir: | |
354ecbb9 | 1165 | svc_printk(rqstp, "bad direction %d, dropping request\n", dir); |
34e9a63b | 1166 | |
1da177e4 LT |
1167 | serv->sv_stats->rpcbadfmt++; |
1168 | goto dropit; /* drop request */ | |
1169 | ||
1170 | err_bad_rpc: | |
1171 | serv->sv_stats->rpcbadfmt++; | |
76994313 AD |
1172 | svc_putnl(resv, 1); /* REJECT */ |
1173 | svc_putnl(resv, 0); /* RPC_MISMATCH */ | |
1174 | svc_putnl(resv, 2); /* Only RPCv2 supported */ | |
1175 | svc_putnl(resv, 2); | |
1da177e4 LT |
1176 | goto sendit; |
1177 | ||
1178 | err_bad_auth: | |
1179 | dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat)); | |
1180 | serv->sv_stats->rpcbadauth++; | |
1181 | /* Restore write pointer to location of accept status: */ | |
8f8e05c5 | 1182 | xdr_ressize_check(rqstp, reply_statp); |
76994313 AD |
1183 | svc_putnl(resv, 1); /* REJECT */ |
1184 | svc_putnl(resv, 1); /* AUTH_ERROR */ | |
1185 | svc_putnl(resv, ntohl(auth_stat)); /* status */ | |
1da177e4 LT |
1186 | goto sendit; |
1187 | ||
1188 | err_bad_prog: | |
9ba02638 | 1189 | dprintk("svc: unknown program %d\n", prog); |
1da177e4 | 1190 | serv->sv_stats->rpcbadfmt++; |
76994313 | 1191 | svc_putnl(resv, RPC_PROG_UNAVAIL); |
1da177e4 LT |
1192 | goto sendit; |
1193 | ||
1194 | err_bad_vers: | |
354ecbb9 | 1195 | svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n", |
34e9a63b N |
1196 | vers, prog, progp->pg_name); |
1197 | ||
1da177e4 | 1198 | serv->sv_stats->rpcbadfmt++; |
76994313 AD |
1199 | svc_putnl(resv, RPC_PROG_MISMATCH); |
1200 | svc_putnl(resv, progp->pg_lovers); | |
1201 | svc_putnl(resv, progp->pg_hivers); | |
1da177e4 LT |
1202 | goto sendit; |
1203 | ||
1204 | err_bad_proc: | |
354ecbb9 | 1205 | svc_printk(rqstp, "unknown procedure (%d)\n", proc); |
34e9a63b | 1206 | |
1da177e4 | 1207 | serv->sv_stats->rpcbadfmt++; |
76994313 | 1208 | svc_putnl(resv, RPC_PROC_UNAVAIL); |
1da177e4 LT |
1209 | goto sendit; |
1210 | ||
1211 | err_garbage: | |
354ecbb9 | 1212 | svc_printk(rqstp, "failed to decode args\n"); |
34e9a63b | 1213 | |
1da177e4 LT |
1214 | rpc_stat = rpc_garbage_args; |
1215 | err_bad: | |
1216 | serv->sv_stats->rpcbadfmt++; | |
76994313 | 1217 | svc_putnl(resv, ntohl(rpc_stat)); |
1da177e4 LT |
1218 | goto sendit; |
1219 | } | |
24c3767e | 1220 | EXPORT_SYMBOL_GPL(svc_process); |
7adae489 GB |
1221 | |
1222 | /* | |
1223 | * Return (transport-specific) limit on the rpc payload. | |
1224 | */ | |
1225 | u32 svc_max_payload(const struct svc_rqst *rqstp) | |
1226 | { | |
49023155 | 1227 | u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload; |
7adae489 | 1228 | |
c6b0a9f8 N |
1229 | if (rqstp->rq_server->sv_max_payload < max) |
1230 | max = rqstp->rq_server->sv_max_payload; | |
7adae489 GB |
1231 | return max; |
1232 | } | |
1233 | EXPORT_SYMBOL_GPL(svc_max_payload); |