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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> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
1da177e4 LT |
23 | |
24 | #include <linux/sunrpc/types.h> | |
25 | #include <linux/sunrpc/xdr.h> | |
26 | #include <linux/sunrpc/stats.h> | |
27 | #include <linux/sunrpc/svcsock.h> | |
28 | #include <linux/sunrpc/clnt.h> | |
4d6bbb62 | 29 | #include <linux/sunrpc/bc_xprt.h> |
1da177e4 LT |
30 | |
31 | #define RPCDBG_FACILITY RPCDBG_SVCDSP | |
1da177e4 | 32 | |
7252d575 CL |
33 | static void svc_unregister(const struct svc_serv *serv); |
34 | ||
42a7fc4a GB |
35 | #define svc_serv_is_pooled(serv) ((serv)->sv_function) |
36 | ||
bfd24160 GB |
37 | /* |
38 | * Mode for mapping cpus to pools. | |
39 | */ | |
40 | enum { | |
42a7fc4a | 41 | SVC_POOL_AUTO = -1, /* choose one of the others */ |
bfd24160 GB |
42 | SVC_POOL_GLOBAL, /* no mapping, just a single global pool |
43 | * (legacy & UP mode) */ | |
44 | SVC_POOL_PERCPU, /* one pool per cpu */ | |
45 | SVC_POOL_PERNODE /* one pool per numa node */ | |
46 | }; | |
42a7fc4a | 47 | #define SVC_POOL_DEFAULT SVC_POOL_GLOBAL |
bfd24160 GB |
48 | |
49 | /* | |
50 | * Structure for mapping cpus to pools and vice versa. | |
51 | * Setup once during sunrpc initialisation. | |
52 | */ | |
53 | static struct svc_pool_map { | |
42a7fc4a | 54 | int count; /* How many svc_servs use us */ |
bfd24160 GB |
55 | int mode; /* Note: int not enum to avoid |
56 | * warnings about "enumeration value | |
57 | * not handled in switch" */ | |
58 | unsigned int npools; | |
59 | unsigned int *pool_to; /* maps pool id to cpu or node */ | |
60 | unsigned int *to_pool; /* maps cpu or node to pool id */ | |
61 | } svc_pool_map = { | |
42a7fc4a GB |
62 | .count = 0, |
63 | .mode = SVC_POOL_DEFAULT | |
bfd24160 | 64 | }; |
42a7fc4a GB |
65 | static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */ |
66 | ||
67 | static int | |
68 | param_set_pool_mode(const char *val, struct kernel_param *kp) | |
69 | { | |
70 | int *ip = (int *)kp->arg; | |
71 | struct svc_pool_map *m = &svc_pool_map; | |
72 | int err; | |
73 | ||
74 | mutex_lock(&svc_pool_map_mutex); | |
75 | ||
76 | err = -EBUSY; | |
77 | if (m->count) | |
78 | goto out; | |
79 | ||
80 | err = 0; | |
81 | if (!strncmp(val, "auto", 4)) | |
82 | *ip = SVC_POOL_AUTO; | |
83 | else if (!strncmp(val, "global", 6)) | |
84 | *ip = SVC_POOL_GLOBAL; | |
85 | else if (!strncmp(val, "percpu", 6)) | |
86 | *ip = SVC_POOL_PERCPU; | |
87 | else if (!strncmp(val, "pernode", 7)) | |
88 | *ip = SVC_POOL_PERNODE; | |
89 | else | |
90 | err = -EINVAL; | |
91 | ||
92 | out: | |
93 | mutex_unlock(&svc_pool_map_mutex); | |
94 | return err; | |
95 | } | |
96 | ||
97 | static int | |
98 | param_get_pool_mode(char *buf, struct kernel_param *kp) | |
99 | { | |
100 | int *ip = (int *)kp->arg; | |
101 | ||
102 | switch (*ip) | |
103 | { | |
104 | case SVC_POOL_AUTO: | |
105 | return strlcpy(buf, "auto", 20); | |
106 | case SVC_POOL_GLOBAL: | |
107 | return strlcpy(buf, "global", 20); | |
108 | case SVC_POOL_PERCPU: | |
109 | return strlcpy(buf, "percpu", 20); | |
110 | case SVC_POOL_PERNODE: | |
111 | return strlcpy(buf, "pernode", 20); | |
112 | default: | |
113 | return sprintf(buf, "%d", *ip); | |
114 | } | |
115 | } | |
bfd24160 | 116 | |
42a7fc4a GB |
117 | module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode, |
118 | &svc_pool_map.mode, 0644); | |
bfd24160 GB |
119 | |
120 | /* | |
121 | * Detect best pool mapping mode heuristically, | |
122 | * according to the machine's topology. | |
123 | */ | |
124 | static int | |
125 | svc_pool_map_choose_mode(void) | |
126 | { | |
127 | unsigned int node; | |
128 | ||
62bc62a8 | 129 | if (nr_online_nodes > 1) { |
bfd24160 GB |
130 | /* |
131 | * Actually have multiple NUMA nodes, | |
132 | * so split pools on NUMA node boundaries | |
133 | */ | |
134 | return SVC_POOL_PERNODE; | |
135 | } | |
136 | ||
72c33688 | 137 | node = first_online_node; |
bfd24160 GB |
138 | if (nr_cpus_node(node) > 2) { |
139 | /* | |
140 | * Non-trivial SMP, or CONFIG_NUMA on | |
141 | * non-NUMA hardware, e.g. with a generic | |
142 | * x86_64 kernel on Xeons. In this case we | |
143 | * want to divide the pools on cpu boundaries. | |
144 | */ | |
145 | return SVC_POOL_PERCPU; | |
146 | } | |
147 | ||
148 | /* default: one global pool */ | |
149 | return SVC_POOL_GLOBAL; | |
150 | } | |
151 | ||
152 | /* | |
153 | * Allocate the to_pool[] and pool_to[] arrays. | |
154 | * Returns 0 on success or an errno. | |
155 | */ | |
156 | static int | |
157 | svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools) | |
158 | { | |
159 | m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); | |
160 | if (!m->to_pool) | |
161 | goto fail; | |
162 | m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); | |
163 | if (!m->pool_to) | |
164 | goto fail_free; | |
165 | ||
166 | return 0; | |
167 | ||
168 | fail_free: | |
169 | kfree(m->to_pool); | |
170 | fail: | |
171 | return -ENOMEM; | |
172 | } | |
173 | ||
174 | /* | |
175 | * Initialise the pool map for SVC_POOL_PERCPU mode. | |
176 | * Returns number of pools or <0 on error. | |
177 | */ | |
178 | static int | |
179 | svc_pool_map_init_percpu(struct svc_pool_map *m) | |
180 | { | |
53b8a315 | 181 | unsigned int maxpools = nr_cpu_ids; |
bfd24160 GB |
182 | unsigned int pidx = 0; |
183 | unsigned int cpu; | |
184 | int err; | |
185 | ||
186 | err = svc_pool_map_alloc_arrays(m, maxpools); | |
187 | if (err) | |
188 | return err; | |
189 | ||
190 | for_each_online_cpu(cpu) { | |
191 | BUG_ON(pidx > maxpools); | |
192 | m->to_pool[cpu] = pidx; | |
193 | m->pool_to[pidx] = cpu; | |
194 | pidx++; | |
195 | } | |
196 | /* cpus brought online later all get mapped to pool0, sorry */ | |
197 | ||
198 | return pidx; | |
199 | }; | |
200 | ||
201 | ||
202 | /* | |
203 | * Initialise the pool map for SVC_POOL_PERNODE mode. | |
204 | * Returns number of pools or <0 on error. | |
205 | */ | |
206 | static int | |
207 | svc_pool_map_init_pernode(struct svc_pool_map *m) | |
208 | { | |
74c7aa8b | 209 | unsigned int maxpools = nr_node_ids; |
bfd24160 GB |
210 | unsigned int pidx = 0; |
211 | unsigned int node; | |
212 | int err; | |
213 | ||
214 | err = svc_pool_map_alloc_arrays(m, maxpools); | |
215 | if (err) | |
216 | return err; | |
217 | ||
218 | for_each_node_with_cpus(node) { | |
219 | /* some architectures (e.g. SN2) have cpuless nodes */ | |
220 | BUG_ON(pidx > maxpools); | |
221 | m->to_pool[node] = pidx; | |
222 | m->pool_to[pidx] = node; | |
223 | pidx++; | |
224 | } | |
225 | /* nodes brought online later all get mapped to pool0, sorry */ | |
226 | ||
227 | return pidx; | |
228 | } | |
229 | ||
230 | ||
231 | /* | |
42a7fc4a GB |
232 | * Add a reference to the global map of cpus to pools (and |
233 | * vice versa). Initialise the map if we're the first user. | |
234 | * Returns the number of pools. | |
bfd24160 GB |
235 | */ |
236 | static unsigned int | |
42a7fc4a | 237 | svc_pool_map_get(void) |
bfd24160 GB |
238 | { |
239 | struct svc_pool_map *m = &svc_pool_map; | |
240 | int npools = -1; | |
241 | ||
42a7fc4a GB |
242 | mutex_lock(&svc_pool_map_mutex); |
243 | ||
244 | if (m->count++) { | |
245 | mutex_unlock(&svc_pool_map_mutex); | |
bfd24160 | 246 | return m->npools; |
42a7fc4a | 247 | } |
bfd24160 | 248 | |
42a7fc4a GB |
249 | if (m->mode == SVC_POOL_AUTO) |
250 | m->mode = svc_pool_map_choose_mode(); | |
bfd24160 GB |
251 | |
252 | switch (m->mode) { | |
253 | case SVC_POOL_PERCPU: | |
254 | npools = svc_pool_map_init_percpu(m); | |
255 | break; | |
256 | case SVC_POOL_PERNODE: | |
257 | npools = svc_pool_map_init_pernode(m); | |
258 | break; | |
259 | } | |
260 | ||
261 | if (npools < 0) { | |
262 | /* default, or memory allocation failure */ | |
263 | npools = 1; | |
264 | m->mode = SVC_POOL_GLOBAL; | |
265 | } | |
266 | m->npools = npools; | |
267 | ||
42a7fc4a | 268 | mutex_unlock(&svc_pool_map_mutex); |
bfd24160 GB |
269 | return m->npools; |
270 | } | |
271 | ||
42a7fc4a GB |
272 | |
273 | /* | |
274 | * Drop a reference to the global map of cpus to pools. | |
275 | * When the last reference is dropped, the map data is | |
276 | * freed; this allows the sysadmin to change the pool | |
277 | * mode using the pool_mode module option without | |
278 | * rebooting or re-loading sunrpc.ko. | |
279 | */ | |
280 | static void | |
281 | svc_pool_map_put(void) | |
282 | { | |
283 | struct svc_pool_map *m = &svc_pool_map; | |
284 | ||
285 | mutex_lock(&svc_pool_map_mutex); | |
286 | ||
287 | if (!--m->count) { | |
288 | m->mode = SVC_POOL_DEFAULT; | |
289 | kfree(m->to_pool); | |
290 | kfree(m->pool_to); | |
291 | m->npools = 0; | |
292 | } | |
293 | ||
294 | mutex_unlock(&svc_pool_map_mutex); | |
295 | } | |
296 | ||
297 | ||
bfd24160 | 298 | /* |
9867d76c | 299 | * Set the given thread's cpus_allowed mask so that it |
bfd24160 | 300 | * will only run on cpus in the given pool. |
bfd24160 | 301 | */ |
9867d76c JL |
302 | static inline void |
303 | svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx) | |
bfd24160 GB |
304 | { |
305 | struct svc_pool_map *m = &svc_pool_map; | |
9867d76c | 306 | unsigned int node = m->pool_to[pidx]; |
bfd24160 GB |
307 | |
308 | /* | |
309 | * The caller checks for sv_nrpools > 1, which | |
42a7fc4a | 310 | * implies that we've been initialized. |
bfd24160 | 311 | */ |
42a7fc4a | 312 | BUG_ON(m->count == 0); |
bfd24160 | 313 | |
9867d76c | 314 | switch (m->mode) { |
bfd24160 | 315 | case SVC_POOL_PERCPU: |
c5f59f08 | 316 | { |
aa85ea5b | 317 | set_cpus_allowed_ptr(task, cpumask_of(node)); |
9867d76c | 318 | break; |
c5f59f08 | 319 | } |
bfd24160 | 320 | case SVC_POOL_PERNODE: |
c5f59f08 | 321 | { |
a70f7302 | 322 | set_cpus_allowed_ptr(task, cpumask_of_node(node)); |
9867d76c | 323 | break; |
bfd24160 | 324 | } |
c5f59f08 | 325 | } |
bfd24160 GB |
326 | } |
327 | ||
328 | /* | |
329 | * Use the mapping mode to choose a pool for a given CPU. | |
330 | * Used when enqueueing an incoming RPC. Always returns | |
331 | * a non-NULL pool pointer. | |
332 | */ | |
333 | struct svc_pool * | |
334 | svc_pool_for_cpu(struct svc_serv *serv, int cpu) | |
335 | { | |
336 | struct svc_pool_map *m = &svc_pool_map; | |
337 | unsigned int pidx = 0; | |
338 | ||
339 | /* | |
42a7fc4a | 340 | * An uninitialised map happens in a pure client when |
bfd24160 GB |
341 | * lockd is brought up, so silently treat it the |
342 | * same as SVC_POOL_GLOBAL. | |
343 | */ | |
42a7fc4a GB |
344 | if (svc_serv_is_pooled(serv)) { |
345 | switch (m->mode) { | |
346 | case SVC_POOL_PERCPU: | |
347 | pidx = m->to_pool[cpu]; | |
348 | break; | |
349 | case SVC_POOL_PERNODE: | |
350 | pidx = m->to_pool[cpu_to_node(cpu)]; | |
351 | break; | |
352 | } | |
bfd24160 GB |
353 | } |
354 | return &serv->sv_pools[pidx % serv->sv_nrpools]; | |
355 | } | |
356 | ||
357 | ||
1da177e4 LT |
358 | /* |
359 | * Create an RPC service | |
360 | */ | |
a7455442 GB |
361 | static struct svc_serv * |
362 | __svc_create(struct svc_program *prog, unsigned int bufsize, int npools, | |
49a9072f | 363 | void (*shutdown)(struct svc_serv *serv)) |
1da177e4 LT |
364 | { |
365 | struct svc_serv *serv; | |
ea339d46 | 366 | unsigned int vers; |
1da177e4 | 367 | unsigned int xdrsize; |
3262c816 | 368 | unsigned int i; |
1da177e4 | 369 | |
0da974f4 | 370 | if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL))) |
1da177e4 | 371 | return NULL; |
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, | |
49a9072f | 430 | void (*shutdown)(struct svc_serv *serv)) |
a7455442 | 431 | { |
49a9072f | 432 | return __svc_create(prog, bufsize, /*npools*/1, shutdown); |
a7455442 | 433 | } |
24c3767e | 434 | EXPORT_SYMBOL_GPL(svc_create); |
a7455442 GB |
435 | |
436 | struct svc_serv * | |
437 | svc_create_pooled(struct svc_program *prog, unsigned int bufsize, | |
49a9072f | 438 | 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 | |
49a9072f | 444 | serv = __svc_create(prog, bufsize, npools, 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 | } | |
24c3767e | 453 | EXPORT_SYMBOL_GPL(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 | } | |
24c3767e | 495 | EXPORT_SYMBOL_GPL(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 | |
ba17686f AA |
506 | /* bc_xprt uses fore channel allocated buffers */ |
507 | if (svc_is_backchannel(rqstp)) | |
508 | return 1; | |
509 | ||
c6b0a9f8 N |
510 | pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply. |
511 | * We assume one is at most one page | |
512 | */ | |
1da177e4 | 513 | arghi = 0; |
09a62660 | 514 | BUG_ON(pages > RPCSVC_MAXPAGES); |
1da177e4 LT |
515 | while (pages) { |
516 | struct page *p = alloc_page(GFP_KERNEL); | |
517 | if (!p) | |
518 | break; | |
44524359 | 519 | rqstp->rq_pages[arghi++] = p; |
1da177e4 LT |
520 | pages--; |
521 | } | |
0dc220f0 | 522 | return pages == 0; |
1da177e4 LT |
523 | } |
524 | ||
525 | /* | |
526 | * Release an RPC server buffer | |
527 | */ | |
528 | static void | |
529 | svc_release_buffer(struct svc_rqst *rqstp) | |
530 | { | |
50c8bb13 CL |
531 | unsigned int i; |
532 | ||
533 | for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++) | |
44524359 N |
534 | if (rqstp->rq_pages[i]) |
535 | put_page(rqstp->rq_pages[i]); | |
1da177e4 LT |
536 | } |
537 | ||
0113ab34 JL |
538 | struct svc_rqst * |
539 | svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool) | |
1da177e4 LT |
540 | { |
541 | struct svc_rqst *rqstp; | |
1da177e4 | 542 | |
0da974f4 | 543 | rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL); |
1da177e4 | 544 | if (!rqstp) |
0113ab34 | 545 | goto out_enomem; |
1da177e4 | 546 | |
1da177e4 LT |
547 | init_waitqueue_head(&rqstp->rq_wait); |
548 | ||
1da177e4 | 549 | serv->sv_nrthreads++; |
3262c816 GB |
550 | spin_lock_bh(&pool->sp_lock); |
551 | pool->sp_nrthreads++; | |
a7455442 | 552 | list_add(&rqstp->rq_all, &pool->sp_all_threads); |
3262c816 | 553 | spin_unlock_bh(&pool->sp_lock); |
1da177e4 | 554 | rqstp->rq_server = serv; |
3262c816 | 555 | rqstp->rq_pool = pool; |
bfd24160 | 556 | |
0113ab34 JL |
557 | rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); |
558 | if (!rqstp->rq_argp) | |
559 | goto out_thread; | |
560 | ||
561 | rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL); | |
562 | if (!rqstp->rq_resp) | |
563 | goto out_thread; | |
564 | ||
565 | if (!svc_init_buffer(rqstp, serv->sv_max_mesg)) | |
566 | goto out_thread; | |
567 | ||
568 | return rqstp; | |
569 | out_thread: | |
570 | svc_exit_thread(rqstp); | |
571 | out_enomem: | |
572 | return ERR_PTR(-ENOMEM); | |
573 | } | |
24c3767e | 574 | EXPORT_SYMBOL_GPL(svc_prepare_thread); |
0113ab34 | 575 | |
a7455442 GB |
576 | /* |
577 | * Choose a pool in which to create a new thread, for svc_set_num_threads | |
578 | */ | |
579 | static inline struct svc_pool * | |
580 | choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) | |
581 | { | |
582 | if (pool != NULL) | |
583 | return pool; | |
584 | ||
cca5172a | 585 | return &serv->sv_pools[(*state)++ % serv->sv_nrpools]; |
a7455442 GB |
586 | } |
587 | ||
588 | /* | |
589 | * Choose a thread to kill, for svc_set_num_threads | |
590 | */ | |
591 | static inline struct task_struct * | |
592 | choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) | |
593 | { | |
594 | unsigned int i; | |
595 | struct task_struct *task = NULL; | |
596 | ||
597 | if (pool != NULL) { | |
598 | spin_lock_bh(&pool->sp_lock); | |
599 | } else { | |
600 | /* choose a pool in round-robin fashion */ | |
cca5172a YH |
601 | for (i = 0; i < serv->sv_nrpools; i++) { |
602 | pool = &serv->sv_pools[--(*state) % serv->sv_nrpools]; | |
a7455442 | 603 | spin_lock_bh(&pool->sp_lock); |
cca5172a YH |
604 | if (!list_empty(&pool->sp_all_threads)) |
605 | goto found_pool; | |
a7455442 | 606 | spin_unlock_bh(&pool->sp_lock); |
cca5172a | 607 | } |
a7455442 GB |
608 | return NULL; |
609 | } | |
610 | ||
611 | found_pool: | |
612 | if (!list_empty(&pool->sp_all_threads)) { | |
613 | struct svc_rqst *rqstp; | |
614 | ||
615 | /* | |
616 | * Remove from the pool->sp_all_threads list | |
617 | * so we don't try to kill it again. | |
618 | */ | |
619 | rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all); | |
620 | list_del_init(&rqstp->rq_all); | |
621 | task = rqstp->rq_task; | |
cca5172a | 622 | } |
a7455442 GB |
623 | spin_unlock_bh(&pool->sp_lock); |
624 | ||
625 | return task; | |
626 | } | |
627 | ||
628 | /* | |
629 | * Create or destroy enough new threads to make the number | |
630 | * of threads the given number. If `pool' is non-NULL, applies | |
631 | * only to threads in that pool, otherwise round-robins between | |
632 | * all pools. Must be called with a svc_get() reference and | |
bedbdd8b | 633 | * the BKL or another lock to protect access to svc_serv fields. |
a7455442 GB |
634 | * |
635 | * Destroying threads relies on the service threads filling in | |
636 | * rqstp->rq_task, which only the nfs ones do. Assumes the serv | |
637 | * has been created using svc_create_pooled(). | |
638 | * | |
639 | * Based on code that used to be in nfsd_svc() but tweaked | |
640 | * to be pool-aware. | |
641 | */ | |
642 | int | |
643 | svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) | |
644 | { | |
9867d76c JL |
645 | struct svc_rqst *rqstp; |
646 | struct task_struct *task; | |
647 | struct svc_pool *chosen_pool; | |
a7455442 GB |
648 | int error = 0; |
649 | unsigned int state = serv->sv_nrthreads-1; | |
650 | ||
651 | if (pool == NULL) { | |
652 | /* The -1 assumes caller has done a svc_get() */ | |
653 | nrservs -= (serv->sv_nrthreads-1); | |
654 | } else { | |
655 | spin_lock_bh(&pool->sp_lock); | |
656 | nrservs -= pool->sp_nrthreads; | |
657 | spin_unlock_bh(&pool->sp_lock); | |
658 | } | |
659 | ||
660 | /* create new threads */ | |
661 | while (nrservs > 0) { | |
662 | nrservs--; | |
9867d76c JL |
663 | chosen_pool = choose_pool(serv, pool, &state); |
664 | ||
665 | rqstp = svc_prepare_thread(serv, chosen_pool); | |
666 | if (IS_ERR(rqstp)) { | |
667 | error = PTR_ERR(rqstp); | |
668 | break; | |
669 | } | |
670 | ||
a7455442 | 671 | __module_get(serv->sv_module); |
9867d76c JL |
672 | task = kthread_create(serv->sv_function, rqstp, serv->sv_name); |
673 | if (IS_ERR(task)) { | |
674 | error = PTR_ERR(task); | |
a7455442 | 675 | module_put(serv->sv_module); |
9867d76c | 676 | svc_exit_thread(rqstp); |
a7455442 GB |
677 | break; |
678 | } | |
9867d76c JL |
679 | |
680 | rqstp->rq_task = task; | |
681 | if (serv->sv_nrpools > 1) | |
682 | svc_pool_map_set_cpumask(task, chosen_pool->sp_id); | |
683 | ||
684 | svc_sock_update_bufs(serv); | |
685 | wake_up_process(task); | |
a7455442 GB |
686 | } |
687 | /* destroy old threads */ | |
688 | while (nrservs < 0 && | |
9867d76c | 689 | (task = choose_victim(serv, pool, &state)) != NULL) { |
a75c5d01 | 690 | send_sig(SIGINT, task, 1); |
a7455442 GB |
691 | nrservs++; |
692 | } | |
693 | ||
694 | return error; | |
695 | } | |
24c3767e | 696 | EXPORT_SYMBOL_GPL(svc_set_num_threads); |
a7455442 | 697 | |
3262c816 | 698 | /* |
bedbdd8b NB |
699 | * Called from a server thread as it's exiting. Caller must hold the BKL or |
700 | * the "service mutex", whichever is appropriate for the service. | |
1da177e4 LT |
701 | */ |
702 | void | |
703 | svc_exit_thread(struct svc_rqst *rqstp) | |
704 | { | |
705 | struct svc_serv *serv = rqstp->rq_server; | |
3262c816 | 706 | struct svc_pool *pool = rqstp->rq_pool; |
1da177e4 LT |
707 | |
708 | svc_release_buffer(rqstp); | |
a51482bd JJ |
709 | kfree(rqstp->rq_resp); |
710 | kfree(rqstp->rq_argp); | |
711 | kfree(rqstp->rq_auth_data); | |
3262c816 GB |
712 | |
713 | spin_lock_bh(&pool->sp_lock); | |
714 | pool->sp_nrthreads--; | |
a7455442 | 715 | list_del(&rqstp->rq_all); |
3262c816 GB |
716 | spin_unlock_bh(&pool->sp_lock); |
717 | ||
1da177e4 LT |
718 | kfree(rqstp); |
719 | ||
720 | /* Release the server */ | |
721 | if (serv) | |
722 | svc_destroy(serv); | |
723 | } | |
24c3767e | 724 | EXPORT_SYMBOL_GPL(svc_exit_thread); |
1da177e4 LT |
725 | |
726 | /* | |
2c7eb0b2 CL |
727 | * Register an "inet" protocol family netid with the local |
728 | * rpcbind daemon via an rpcbind v4 SET request. | |
a26cfad6 | 729 | * |
2c7eb0b2 CL |
730 | * No netconfig infrastructure is available in the kernel, so |
731 | * we map IP_ protocol numbers to netids by hand. | |
a26cfad6 | 732 | * |
2c7eb0b2 CL |
733 | * Returns zero on success; a negative errno value is returned |
734 | * if any error occurs. | |
1da177e4 | 735 | */ |
2c7eb0b2 CL |
736 | static int __svc_rpcb_register4(const u32 program, const u32 version, |
737 | const unsigned short protocol, | |
738 | const unsigned short port) | |
a26cfad6 | 739 | { |
cadc0fa5 | 740 | const struct sockaddr_in sin = { |
a26cfad6 CL |
741 | .sin_family = AF_INET, |
742 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
743 | .sin_port = htons(port), | |
744 | }; | |
cadc0fa5 CL |
745 | const char *netid; |
746 | int error; | |
2c7eb0b2 CL |
747 | |
748 | switch (protocol) { | |
749 | case IPPROTO_UDP: | |
750 | netid = RPCBIND_NETID_UDP; | |
751 | break; | |
752 | case IPPROTO_TCP: | |
753 | netid = RPCBIND_NETID_TCP; | |
754 | break; | |
755 | default: | |
ba5c35e0 | 756 | return -ENOPROTOOPT; |
2c7eb0b2 CL |
757 | } |
758 | ||
cadc0fa5 CL |
759 | error = rpcb_v4_register(program, version, |
760 | (const struct sockaddr *)&sin, netid); | |
761 | ||
762 | /* | |
763 | * User space didn't support rpcbind v4, so retry this | |
764 | * registration request with the legacy rpcbind v2 protocol. | |
765 | */ | |
766 | if (error == -EPROTONOSUPPORT) | |
767 | error = rpcb_register(program, version, protocol, port); | |
768 | ||
769 | return error; | |
2c7eb0b2 CL |
770 | } |
771 | ||
cadc0fa5 | 772 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
2c7eb0b2 CL |
773 | /* |
774 | * Register an "inet6" protocol family netid with the local | |
775 | * rpcbind daemon via an rpcbind v4 SET request. | |
776 | * | |
777 | * No netconfig infrastructure is available in the kernel, so | |
778 | * we map IP_ protocol numbers to netids by hand. | |
779 | * | |
780 | * Returns zero on success; a negative errno value is returned | |
781 | * if any error occurs. | |
782 | */ | |
783 | static int __svc_rpcb_register6(const u32 program, const u32 version, | |
784 | const unsigned short protocol, | |
785 | const unsigned short port) | |
786 | { | |
cadc0fa5 | 787 | const struct sockaddr_in6 sin6 = { |
a26cfad6 CL |
788 | .sin6_family = AF_INET6, |
789 | .sin6_addr = IN6ADDR_ANY_INIT, | |
790 | .sin6_port = htons(port), | |
791 | }; | |
cadc0fa5 CL |
792 | const char *netid; |
793 | int error; | |
a26cfad6 | 794 | |
2c7eb0b2 CL |
795 | switch (protocol) { |
796 | case IPPROTO_UDP: | |
797 | netid = RPCBIND_NETID_UDP6; | |
a26cfad6 | 798 | break; |
2c7eb0b2 | 799 | case IPPROTO_TCP: |
a26cfad6 | 800 | netid = RPCBIND_NETID_TCP6; |
a26cfad6 CL |
801 | break; |
802 | default: | |
ba5c35e0 | 803 | return -ENOPROTOOPT; |
2c7eb0b2 CL |
804 | } |
805 | ||
cadc0fa5 CL |
806 | error = rpcb_v4_register(program, version, |
807 | (const struct sockaddr *)&sin6, netid); | |
808 | ||
809 | /* | |
810 | * User space didn't support rpcbind version 4, so we won't | |
811 | * use a PF_INET6 listener. | |
812 | */ | |
813 | if (error == -EPROTONOSUPPORT) | |
814 | error = -EAFNOSUPPORT; | |
815 | ||
816 | return error; | |
2c7eb0b2 | 817 | } |
cadc0fa5 | 818 | #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ |
2c7eb0b2 CL |
819 | |
820 | /* | |
821 | * Register a kernel RPC service via rpcbind version 4. | |
822 | * | |
823 | * Returns zero on success; a negative errno value is returned | |
824 | * if any error occurs. | |
825 | */ | |
363f724c CL |
826 | static int __svc_register(const char *progname, |
827 | const u32 program, const u32 version, | |
4b62e58c | 828 | const int family, |
2c7eb0b2 CL |
829 | const unsigned short protocol, |
830 | const unsigned short port) | |
831 | { | |
363f724c | 832 | int error = -EAFNOSUPPORT; |
2c7eb0b2 CL |
833 | |
834 | switch (family) { | |
4b62e58c | 835 | case PF_INET: |
363f724c | 836 | error = __svc_rpcb_register4(program, version, |
2c7eb0b2 | 837 | protocol, port); |
cadc0fa5 CL |
838 | break; |
839 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
4b62e58c | 840 | case PF_INET6: |
2c7eb0b2 CL |
841 | error = __svc_rpcb_register6(program, version, |
842 | protocol, port); | |
cadc0fa5 | 843 | #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ |
a26cfad6 CL |
844 | } |
845 | ||
363f724c CL |
846 | if (error < 0) |
847 | printk(KERN_WARNING "svc: failed to register %sv%u RPC " | |
848 | "service (errno %d).\n", progname, version, -error); | |
849 | return error; | |
a26cfad6 | 850 | } |
2c7eb0b2 | 851 | |
a26cfad6 CL |
852 | /** |
853 | * svc_register - register an RPC service with the local portmapper | |
854 | * @serv: svc_serv struct for the service to register | |
4b62e58c | 855 | * @family: protocol family of service's listener socket |
a26cfad6 CL |
856 | * @proto: transport protocol number to advertise |
857 | * @port: port to advertise | |
858 | * | |
4b62e58c | 859 | * Service is registered for any address in the passed-in protocol family |
a26cfad6 | 860 | */ |
4b62e58c CL |
861 | int svc_register(const struct svc_serv *serv, const int family, |
862 | const unsigned short proto, const unsigned short port) | |
1da177e4 LT |
863 | { |
864 | struct svc_program *progp; | |
ea339d46 | 865 | unsigned int i; |
14aeb211 | 866 | int error = 0; |
1da177e4 | 867 | |
7252d575 | 868 | BUG_ON(proto == 0 && port == 0); |
1da177e4 | 869 | |
bc5fea42 OK |
870 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { |
871 | for (i = 0; i < progp->pg_nvers; i++) { | |
872 | if (progp->pg_vers[i] == NULL) | |
873 | continue; | |
874 | ||
2c7eb0b2 | 875 | dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n", |
bc5fea42 | 876 | progp->pg_name, |
2c7eb0b2 | 877 | i, |
bc5fea42 OK |
878 | proto == IPPROTO_UDP? "udp" : "tcp", |
879 | port, | |
4b62e58c | 880 | family, |
bc5fea42 OK |
881 | progp->pg_vers[i]->vs_hidden? |
882 | " (but not telling portmap)" : ""); | |
883 | ||
884 | if (progp->pg_vers[i]->vs_hidden) | |
885 | continue; | |
886 | ||
363f724c CL |
887 | error = __svc_register(progp->pg_name, progp->pg_prog, |
888 | i, family, proto, port); | |
bc5fea42 OK |
889 | if (error < 0) |
890 | break; | |
1da177e4 LT |
891 | } |
892 | } | |
893 | ||
7252d575 CL |
894 | return error; |
895 | } | |
896 | ||
d5a8620f CL |
897 | /* |
898 | * If user space is running rpcbind, it should take the v4 UNSET | |
899 | * and clear everything for this [program, version]. If user space | |
900 | * is running portmap, it will reject the v4 UNSET, but won't have | |
901 | * any "inet6" entries anyway. So a PMAP_UNSET should be sufficient | |
902 | * in this case to clear all existing entries for [program, version]. | |
903 | */ | |
f6fb3f6f CL |
904 | static void __svc_unregister(const u32 program, const u32 version, |
905 | const char *progname) | |
906 | { | |
f6fb3f6f CL |
907 | int error; |
908 | ||
d5a8620f | 909 | error = rpcb_v4_register(program, version, NULL, ""); |
f6fb3f6f | 910 | |
d5a8620f CL |
911 | /* |
912 | * User space didn't support rpcbind v4, so retry this | |
913 | * request with the legacy rpcbind v2 protocol. | |
914 | */ | |
915 | if (error == -EPROTONOSUPPORT) | |
916 | error = rpcb_register(program, version, 0, 0); | |
f6fb3f6f | 917 | |
f6fb3f6f CL |
918 | dprintk("svc: %s(%sv%u), error %d\n", |
919 | __func__, progname, version, error); | |
920 | } | |
921 | ||
7252d575 | 922 | /* |
f6fb3f6f CL |
923 | * All netids, bind addresses and ports registered for [program, version] |
924 | * are removed from the local rpcbind database (if the service is not | |
925 | * hidden) to make way for a new instance of the service. | |
7252d575 | 926 | * |
f6fb3f6f CL |
927 | * The result of unregistration is reported via dprintk for those who want |
928 | * verification of the result, but is otherwise not important. | |
7252d575 CL |
929 | */ |
930 | static void svc_unregister(const struct svc_serv *serv) | |
931 | { | |
932 | struct svc_program *progp; | |
933 | unsigned long flags; | |
934 | unsigned int i; | |
7252d575 CL |
935 | |
936 | clear_thread_flag(TIF_SIGPENDING); | |
937 | ||
938 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { | |
939 | for (i = 0; i < progp->pg_nvers; i++) { | |
940 | if (progp->pg_vers[i] == NULL) | |
941 | continue; | |
942 | if (progp->pg_vers[i]->vs_hidden) | |
943 | continue; | |
944 | ||
f6fb3f6f | 945 | __svc_unregister(progp->pg_prog, i, progp->pg_name); |
7252d575 | 946 | } |
1da177e4 LT |
947 | } |
948 | ||
7252d575 CL |
949 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
950 | recalc_sigpending(); | |
951 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
1da177e4 LT |
952 | } |
953 | ||
354ecbb9 DDAG |
954 | /* |
955 | * Printk the given error with the address of the client that caused it. | |
956 | */ | |
957 | static int | |
958 | __attribute__ ((format (printf, 2, 3))) | |
959 | svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) | |
960 | { | |
961 | va_list args; | |
962 | int r; | |
963 | char buf[RPC_MAX_ADDRBUFLEN]; | |
964 | ||
965 | if (!net_ratelimit()) | |
966 | return 0; | |
967 | ||
968 | printk(KERN_WARNING "svc: %s: ", | |
969 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
970 | ||
971 | va_start(args, fmt); | |
972 | r = vprintk(fmt, args); | |
973 | va_end(args); | |
974 | ||
975 | return r; | |
976 | } | |
977 | ||
1da177e4 | 978 | /* |
1cad7ea6 | 979 | * Common routine for processing the RPC request. |
1da177e4 | 980 | */ |
1cad7ea6 RL |
981 | static int |
982 | svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) | |
1da177e4 LT |
983 | { |
984 | struct svc_program *progp; | |
985 | struct svc_version *versp = NULL; /* compiler food */ | |
986 | struct svc_procedure *procp = NULL; | |
6fb2b47f | 987 | struct svc_serv *serv = rqstp->rq_server; |
1da177e4 | 988 | kxdrproc_t xdr; |
d8ed029d | 989 | __be32 *statp; |
1cad7ea6 | 990 | u32 prog, vers, proc; |
d8ed029d | 991 | __be32 auth_stat, rpc_stat; |
1da177e4 | 992 | int auth_res; |
8f8e05c5 | 993 | __be32 *reply_statp; |
1da177e4 LT |
994 | |
995 | rpc_stat = rpc_success; | |
996 | ||
997 | if (argv->iov_len < 6*4) | |
998 | goto err_short_len; | |
999 | ||
5c04c46a | 1000 | /* Will be turned off only in gss privacy case: */ |
cf8208d0 | 1001 | rqstp->rq_splice_ok = 1; |
2f425878 AA |
1002 | /* Will be turned off only when NFSv4 Sessions are used */ |
1003 | rqstp->rq_usedeferral = 1; | |
9e701c61 | 1004 | rqstp->rq_dropme = false; |
e831fe65 TT |
1005 | |
1006 | /* Setup reply header */ | |
1007 | rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp); | |
1da177e4 | 1008 | |
1da177e4 LT |
1009 | svc_putu32(resv, rqstp->rq_xid); |
1010 | ||
76994313 | 1011 | vers = svc_getnl(argv); |
1da177e4 LT |
1012 | |
1013 | /* First words of reply: */ | |
76994313 | 1014 | svc_putnl(resv, 1); /* REPLY */ |
1da177e4 | 1015 | |
1da177e4 LT |
1016 | if (vers != 2) /* RPC version number */ |
1017 | goto err_bad_rpc; | |
1018 | ||
1019 | /* Save position in case we later decide to reject: */ | |
8f8e05c5 | 1020 | reply_statp = resv->iov_base + resv->iov_len; |
1da177e4 | 1021 | |
76994313 | 1022 | svc_putnl(resv, 0); /* ACCEPT */ |
1da177e4 | 1023 | |
76994313 AD |
1024 | rqstp->rq_prog = prog = svc_getnl(argv); /* program number */ |
1025 | rqstp->rq_vers = vers = svc_getnl(argv); /* version number */ | |
1026 | rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */ | |
1da177e4 LT |
1027 | |
1028 | progp = serv->sv_program; | |
80d188a6 N |
1029 | |
1030 | for (progp = serv->sv_program; progp; progp = progp->pg_next) | |
1031 | if (prog == progp->pg_prog) | |
1032 | break; | |
1033 | ||
1da177e4 LT |
1034 | /* |
1035 | * Decode auth data, and add verifier to reply buffer. | |
1036 | * We do this before anything else in order to get a decent | |
1037 | * auth verifier. | |
1038 | */ | |
1039 | auth_res = svc_authenticate(rqstp, &auth_stat); | |
1040 | /* Also give the program a chance to reject this call: */ | |
80d188a6 | 1041 | if (auth_res == SVC_OK && progp) { |
1da177e4 LT |
1042 | auth_stat = rpc_autherr_badcred; |
1043 | auth_res = progp->pg_authenticate(rqstp); | |
1044 | } | |
1045 | switch (auth_res) { | |
1046 | case SVC_OK: | |
1047 | break; | |
1048 | case SVC_GARBAGE: | |
dd35210e | 1049 | goto err_garbage; |
1da177e4 LT |
1050 | case SVC_SYSERR: |
1051 | rpc_stat = rpc_system_err; | |
1052 | goto err_bad; | |
1053 | case SVC_DENIED: | |
1054 | goto err_bad_auth; | |
1ebede86 N |
1055 | case SVC_CLOSE: |
1056 | if (test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags)) | |
1057 | svc_close_xprt(rqstp->rq_xprt); | |
1da177e4 LT |
1058 | case SVC_DROP: |
1059 | goto dropit; | |
1060 | case SVC_COMPLETE: | |
1061 | goto sendit; | |
1062 | } | |
80d188a6 | 1063 | |
9ba02638 | 1064 | if (progp == NULL) |
1da177e4 LT |
1065 | goto err_bad_prog; |
1066 | ||
1067 | if (vers >= progp->pg_nvers || | |
1068 | !(versp = progp->pg_vers[vers])) | |
1069 | goto err_bad_vers; | |
1070 | ||
1071 | procp = versp->vs_proc + proc; | |
1072 | if (proc >= versp->vs_nproc || !procp->pc_func) | |
1073 | goto err_bad_proc; | |
1da177e4 LT |
1074 | rqstp->rq_procinfo = procp; |
1075 | ||
1076 | /* Syntactic check complete */ | |
1077 | serv->sv_stats->rpccnt++; | |
1078 | ||
1079 | /* Build the reply header. */ | |
1080 | statp = resv->iov_base +resv->iov_len; | |
76994313 | 1081 | svc_putnl(resv, RPC_SUCCESS); |
1da177e4 LT |
1082 | |
1083 | /* Bump per-procedure stats counter */ | |
1084 | procp->pc_count++; | |
1085 | ||
1086 | /* Initialize storage for argp and resp */ | |
1087 | memset(rqstp->rq_argp, 0, procp->pc_argsize); | |
1088 | memset(rqstp->rq_resp, 0, procp->pc_ressize); | |
1089 | ||
cca5172a | 1090 | /* un-reserve some of the out-queue now that we have a |
1da177e4 LT |
1091 | * better idea of reply size |
1092 | */ | |
1093 | if (procp->pc_xdrressize) | |
cd123012 | 1094 | svc_reserve_auth(rqstp, procp->pc_xdrressize<<2); |
1da177e4 LT |
1095 | |
1096 | /* Call the function that processes the request. */ | |
1097 | if (!versp->vs_dispatch) { | |
1098 | /* Decode arguments */ | |
1099 | xdr = procp->pc_decode; | |
1100 | if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp)) | |
1101 | goto err_garbage; | |
1102 | ||
1103 | *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
1104 | ||
1105 | /* Encode reply */ | |
9e701c61 | 1106 | if (rqstp->rq_dropme) { |
d343fce1 N |
1107 | if (procp->pc_release) |
1108 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); | |
1109 | goto dropit; | |
1110 | } | |
f64f9e71 JP |
1111 | if (*statp == rpc_success && |
1112 | (xdr = procp->pc_encode) && | |
1113 | !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) { | |
1da177e4 LT |
1114 | dprintk("svc: failed to encode reply\n"); |
1115 | /* serv->sv_stats->rpcsystemerr++; */ | |
1116 | *statp = rpc_system_err; | |
1117 | } | |
1118 | } else { | |
1119 | dprintk("svc: calling dispatcher\n"); | |
1120 | if (!versp->vs_dispatch(rqstp, statp)) { | |
1121 | /* Release reply info */ | |
1122 | if (procp->pc_release) | |
1123 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); | |
1124 | goto dropit; | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | /* Check RPC status result */ | |
1129 | if (*statp != rpc_success) | |
1130 | resv->iov_len = ((void*)statp) - resv->iov_base + 4; | |
1131 | ||
1132 | /* Release reply info */ | |
1133 | if (procp->pc_release) | |
1134 | procp->pc_release(rqstp, NULL, rqstp->rq_resp); | |
1135 | ||
1136 | if (procp->pc_encode == NULL) | |
1137 | goto dropit; | |
1138 | ||
1139 | sendit: | |
1140 | if (svc_authorise(rqstp)) | |
1141 | goto dropit; | |
1cad7ea6 | 1142 | return 1; /* Caller can now send it */ |
1da177e4 LT |
1143 | |
1144 | dropit: | |
1145 | svc_authorise(rqstp); /* doesn't hurt to call this twice */ | |
1146 | dprintk("svc: svc_process dropit\n"); | |
1da177e4 LT |
1147 | return 0; |
1148 | ||
1149 | err_short_len: | |
354ecbb9 DDAG |
1150 | svc_printk(rqstp, "short len %Zd, dropping request\n", |
1151 | argv->iov_len); | |
34e9a63b | 1152 | |
1da177e4 LT |
1153 | goto dropit; /* drop request */ |
1154 | ||
1da177e4 LT |
1155 | err_bad_rpc: |
1156 | serv->sv_stats->rpcbadfmt++; | |
76994313 AD |
1157 | svc_putnl(resv, 1); /* REJECT */ |
1158 | svc_putnl(resv, 0); /* RPC_MISMATCH */ | |
1159 | svc_putnl(resv, 2); /* Only RPCv2 supported */ | |
1160 | svc_putnl(resv, 2); | |
1da177e4 LT |
1161 | goto sendit; |
1162 | ||
1163 | err_bad_auth: | |
1164 | dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat)); | |
1165 | serv->sv_stats->rpcbadauth++; | |
1166 | /* Restore write pointer to location of accept status: */ | |
8f8e05c5 | 1167 | xdr_ressize_check(rqstp, reply_statp); |
76994313 AD |
1168 | svc_putnl(resv, 1); /* REJECT */ |
1169 | svc_putnl(resv, 1); /* AUTH_ERROR */ | |
1170 | svc_putnl(resv, ntohl(auth_stat)); /* status */ | |
1da177e4 LT |
1171 | goto sendit; |
1172 | ||
1173 | err_bad_prog: | |
9ba02638 | 1174 | dprintk("svc: unknown program %d\n", prog); |
1da177e4 | 1175 | serv->sv_stats->rpcbadfmt++; |
76994313 | 1176 | svc_putnl(resv, RPC_PROG_UNAVAIL); |
1da177e4 LT |
1177 | goto sendit; |
1178 | ||
1179 | err_bad_vers: | |
354ecbb9 | 1180 | svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n", |
34e9a63b N |
1181 | vers, prog, progp->pg_name); |
1182 | ||
1da177e4 | 1183 | serv->sv_stats->rpcbadfmt++; |
76994313 AD |
1184 | svc_putnl(resv, RPC_PROG_MISMATCH); |
1185 | svc_putnl(resv, progp->pg_lovers); | |
1186 | svc_putnl(resv, progp->pg_hivers); | |
1da177e4 LT |
1187 | goto sendit; |
1188 | ||
1189 | err_bad_proc: | |
354ecbb9 | 1190 | svc_printk(rqstp, "unknown procedure (%d)\n", proc); |
34e9a63b | 1191 | |
1da177e4 | 1192 | serv->sv_stats->rpcbadfmt++; |
76994313 | 1193 | svc_putnl(resv, RPC_PROC_UNAVAIL); |
1da177e4 LT |
1194 | goto sendit; |
1195 | ||
1196 | err_garbage: | |
354ecbb9 | 1197 | svc_printk(rqstp, "failed to decode args\n"); |
34e9a63b | 1198 | |
1da177e4 LT |
1199 | rpc_stat = rpc_garbage_args; |
1200 | err_bad: | |
1201 | serv->sv_stats->rpcbadfmt++; | |
76994313 | 1202 | svc_putnl(resv, ntohl(rpc_stat)); |
1da177e4 LT |
1203 | goto sendit; |
1204 | } | |
24c3767e | 1205 | EXPORT_SYMBOL_GPL(svc_process); |
7adae489 | 1206 | |
1cad7ea6 RL |
1207 | /* |
1208 | * Process the RPC request. | |
1209 | */ | |
1210 | int | |
1211 | svc_process(struct svc_rqst *rqstp) | |
1212 | { | |
1213 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1214 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1215 | struct svc_serv *serv = rqstp->rq_server; | |
1216 | u32 dir; | |
1cad7ea6 RL |
1217 | |
1218 | /* | |
1219 | * Setup response xdr_buf. | |
1220 | * Initially it has just one page | |
1221 | */ | |
1222 | rqstp->rq_resused = 1; | |
1223 | resv->iov_base = page_address(rqstp->rq_respages[0]); | |
1224 | resv->iov_len = 0; | |
1225 | rqstp->rq_res.pages = rqstp->rq_respages + 1; | |
1226 | rqstp->rq_res.len = 0; | |
1227 | rqstp->rq_res.page_base = 0; | |
1228 | rqstp->rq_res.page_len = 0; | |
1229 | rqstp->rq_res.buflen = PAGE_SIZE; | |
1230 | rqstp->rq_res.tail[0].iov_base = NULL; | |
1231 | rqstp->rq_res.tail[0].iov_len = 0; | |
1232 | ||
1233 | rqstp->rq_xid = svc_getu32(argv); | |
1234 | ||
1235 | dir = svc_getnl(argv); | |
1236 | if (dir != 0) { | |
1237 | /* direction != CALL */ | |
1238 | svc_printk(rqstp, "bad direction %d, dropping request\n", dir); | |
1239 | serv->sv_stats->rpcbadfmt++; | |
1240 | svc_drop(rqstp); | |
1241 | return 0; | |
1242 | } | |
1243 | ||
4b5b3ba1 AA |
1244 | /* Returns 1 for send, 0 for drop */ |
1245 | if (svc_process_common(rqstp, argv, resv)) | |
1246 | return svc_send(rqstp); | |
1247 | else { | |
1248 | svc_drop(rqstp); | |
1249 | return 0; | |
1250 | } | |
1cad7ea6 RL |
1251 | } |
1252 | ||
4d6bbb62 RL |
1253 | #if defined(CONFIG_NFS_V4_1) |
1254 | /* | |
1255 | * Process a backchannel RPC request that arrived over an existing | |
1256 | * outbound connection | |
1257 | */ | |
1258 | int | |
1259 | bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req, | |
1260 | struct svc_rqst *rqstp) | |
1261 | { | |
1262 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1263 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
4d6bbb62 RL |
1264 | |
1265 | /* Build the svc_rqst used by the common processing routine */ | |
4a19de0f | 1266 | rqstp->rq_xprt = serv->sv_bc_xprt; |
4d6bbb62 RL |
1267 | rqstp->rq_xid = req->rq_xid; |
1268 | rqstp->rq_prot = req->rq_xprt->prot; | |
1269 | rqstp->rq_server = serv; | |
1270 | ||
1271 | rqstp->rq_addrlen = sizeof(req->rq_xprt->addr); | |
1272 | memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen); | |
1273 | memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg)); | |
1274 | memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res)); | |
1275 | ||
1276 | /* reset result send buffer "put" position */ | |
1277 | resv->iov_len = 0; | |
1278 | ||
1279 | if (rqstp->rq_prot != IPPROTO_TCP) { | |
1280 | printk(KERN_ERR "No support for Non-TCP transports!\n"); | |
1281 | BUG(); | |
1282 | } | |
1283 | ||
1284 | /* | |
1285 | * Skip the next two words because they've already been | |
1286 | * processed in the trasport | |
1287 | */ | |
1288 | svc_getu32(argv); /* XID */ | |
1289 | svc_getnl(argv); /* CALLDIR */ | |
1290 | ||
4b5b3ba1 AA |
1291 | /* Returns 1 for send, 0 for drop */ |
1292 | if (svc_process_common(rqstp, argv, resv)) { | |
1293 | memcpy(&req->rq_snd_buf, &rqstp->rq_res, | |
1294 | sizeof(req->rq_snd_buf)); | |
1295 | return bc_send(req); | |
1296 | } else { | |
1297 | /* Nothing to do to drop request */ | |
1298 | return 0; | |
1299 | } | |
4d6bbb62 RL |
1300 | } |
1301 | EXPORT_SYMBOL(bc_svc_process); | |
1302 | #endif /* CONFIG_NFS_V4_1 */ | |
1303 | ||
7adae489 GB |
1304 | /* |
1305 | * Return (transport-specific) limit on the rpc payload. | |
1306 | */ | |
1307 | u32 svc_max_payload(const struct svc_rqst *rqstp) | |
1308 | { | |
49023155 | 1309 | u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload; |
7adae489 | 1310 | |
c6b0a9f8 N |
1311 | if (rqstp->rq_server->sv_max_payload < max) |
1312 | max = rqstp->rq_server->sv_max_payload; | |
7adae489 GB |
1313 | return max; |
1314 | } | |
1315 | EXPORT_SYMBOL_GPL(svc_max_payload); |