blob: 55ea6df069deeb2042b8b1b8dc4c5294d5bfa649 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Greg Banksbfd24162006-10-02 02:18:01 -07007 *
8 * Multiple threads pools and NUMAisation
9 * Copyright (c) 2006 Silicon Graphics, Inc.
10 * by Greg Banks <gnb@melbourne.sgi.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
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>
Greg Banksa7455442006-10-02 02:17:59 -070019#include <linux/interrupt.h>
20#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Greg Banks42a7fc42007-03-06 01:42:23 -080030#define svc_serv_is_pooled(serv) ((serv)->sv_function)
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032/*
Greg Banksbfd24162006-10-02 02:18:01 -070033 * Mode for mapping cpus to pools.
34 */
35enum {
Greg Banks42a7fc42007-03-06 01:42:23 -080036 SVC_POOL_AUTO = -1, /* choose one of the others */
Greg Banksbfd24162006-10-02 02:18:01 -070037 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};
Greg Banks42a7fc42007-03-06 01:42:23 -080042#define SVC_POOL_DEFAULT SVC_POOL_GLOBAL
Greg Banksbfd24162006-10-02 02:18:01 -070043
44/*
45 * Structure for mapping cpus to pools and vice versa.
46 * Setup once during sunrpc initialisation.
47 */
48static struct svc_pool_map {
Greg Banks42a7fc42007-03-06 01:42:23 -080049 int count; /* How many svc_servs use us */
Greg Banksbfd24162006-10-02 02:18:01 -070050 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 = {
Greg Banks42a7fc42007-03-06 01:42:23 -080057 .count = 0,
58 .mode = SVC_POOL_DEFAULT
Greg Banksbfd24162006-10-02 02:18:01 -070059};
Greg Banks42a7fc42007-03-06 01:42:23 -080060static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */
Greg Banksbfd24162006-10-02 02:18:01 -070061
Greg Banks42a7fc42007-03-06 01:42:23 -080062static int
63param_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
87out:
88 mutex_unlock(&svc_pool_map_mutex);
89 return err;
90}
91
92static int
93param_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}
111
112module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode,
113 &svc_pool_map.mode, 0644);
Greg Banksbfd24162006-10-02 02:18:01 -0700114
115/*
116 * Detect best pool mapping mode heuristically,
117 * according to the machine's topology.
118 */
119static int
120svc_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 */
151static int
152svc_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
163fail_free:
164 kfree(m->to_pool);
165fail:
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 */
173static int
174svc_pool_map_init_percpu(struct svc_pool_map *m)
175{
Christoph Lameter53b8a312007-02-20 13:57:51 -0800176 unsigned int maxpools = nr_cpu_ids;
Greg Banksbfd24162006-10-02 02:18:01 -0700177 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 */
201static int
202svc_pool_map_init_pernode(struct svc_pool_map *m)
203{
Christoph Lameter74c7aa82007-02-20 13:57:51 -0800204 unsigned int maxpools = nr_node_ids;
Greg Banksbfd24162006-10-02 02:18:01 -0700205 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/*
Greg Banks42a7fc42007-03-06 01:42:23 -0800227 * 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.
Greg Banksbfd24162006-10-02 02:18:01 -0700230 */
231static unsigned int
Greg Banks42a7fc42007-03-06 01:42:23 -0800232svc_pool_map_get(void)
Greg Banksbfd24162006-10-02 02:18:01 -0700233{
234 struct svc_pool_map *m = &svc_pool_map;
235 int npools = -1;
236
Greg Banks42a7fc42007-03-06 01:42:23 -0800237 mutex_lock(&svc_pool_map_mutex);
Greg Banksbfd24162006-10-02 02:18:01 -0700238
Greg Banks42a7fc42007-03-06 01:42:23 -0800239 if (m->count++) {
240 mutex_unlock(&svc_pool_map_mutex);
241 return m->npools;
242 }
243
244 if (m->mode == SVC_POOL_AUTO)
245 m->mode = svc_pool_map_choose_mode();
Greg Banksbfd24162006-10-02 02:18:01 -0700246
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
Greg Banks42a7fc42007-03-06 01:42:23 -0800263 mutex_unlock(&svc_pool_map_mutex);
Greg Banksbfd24162006-10-02 02:18:01 -0700264 return m->npools;
265}
266
Greg Banks42a7fc42007-03-06 01:42:23 -0800267
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 */
275static void
276svc_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
Greg Banksbfd24162006-10-02 02:18:01 -0700293/*
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 */
299static inline int
300svc_pool_map_set_cpumask(unsigned int pidx, cpumask_t *oldmask)
301{
302 struct svc_pool_map *m = &svc_pool_map;
303 unsigned int node; /* or cpu */
304
305 /*
306 * The caller checks for sv_nrpools > 1, which
Greg Banks42a7fc42007-03-06 01:42:23 -0800307 * implies that we've been initialized.
Greg Banksbfd24162006-10-02 02:18:01 -0700308 */
Greg Banks42a7fc42007-03-06 01:42:23 -0800309 BUG_ON(m->count == 0);
Greg Banksbfd24162006-10-02 02:18:01 -0700310
311 switch (m->mode)
312 {
313 default:
314 return 0;
315 case SVC_POOL_PERCPU:
316 node = m->pool_to[pidx];
317 *oldmask = current->cpus_allowed;
318 set_cpus_allowed(current, cpumask_of_cpu(node));
319 return 1;
320 case SVC_POOL_PERNODE:
321 node = m->pool_to[pidx];
322 *oldmask = current->cpus_allowed;
323 set_cpus_allowed(current, node_to_cpumask(node));
324 return 1;
325 }
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 */
333struct svc_pool *
334svc_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 /*
Greg Banks42a7fc42007-03-06 01:42:23 -0800340 * An uninitialised map happens in a pure client when
Greg Banksbfd24162006-10-02 02:18:01 -0700341 * lockd is brought up, so silently treat it the
342 * same as SVC_POOL_GLOBAL.
343 */
Greg Banks42a7fc42007-03-06 01:42:23 -0800344 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 }
Greg Banksbfd24162006-10-02 02:18:01 -0700353 }
354 return &serv->sv_pools[pidx % serv->sv_nrpools];
355}
356
357
358/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 * Create an RPC service
360 */
Greg Banksa7455442006-10-02 02:17:59 -0700361static struct svc_serv *
362__svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
NeilBrownbc591cc2006-10-02 02:17:44 -0700363 void (*shutdown)(struct svc_serv *serv))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364{
365 struct svc_serv *serv;
366 int vers;
367 unsigned int xdrsize;
Greg Banks3262c812006-10-02 02:17:58 -0700368 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700370 if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 return NULL;
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +0000372 serv->sv_name = prog->pg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 serv->sv_program = prog;
374 serv->sv_nrthreads = 1;
375 serv->sv_stats = prog->pg_stats;
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700376 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);
NeilBrownbc591cc2006-10-02 02:17:44 -0700380 serv->sv_shutdown = shutdown;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 xdrsize = 0;
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +0000382 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 serv->sv_xdrsize = xdrsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 INIT_LIST_HEAD(&serv->sv_tempsocks);
396 INIT_LIST_HEAD(&serv->sv_permsocks);
Greg Banks36bdfc82006-10-02 02:17:54 -0700397 init_timer(&serv->sv_temptimer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 spin_lock_init(&serv->sv_lock);
399
Greg Banksa7455442006-10-02 02:17:59 -0700400 serv->sv_nrpools = npools;
Greg Banks3262c812006-10-02 02:17:58 -0700401 serv->sv_pools =
Robert P. J. Daycd861282006-12-13 00:34:52 -0800402 kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
Greg Banks3262c812006-10-02 02:17:58 -0700403 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
Chuck Lever46121cf2007-01-31 12:14:08 -0500412 dprintk("svc: initialising pool %u for %s\n",
Greg Banks3262c812006-10-02 02:17:58 -0700413 i, serv->sv_name);
414
415 pool->sp_id = i;
416 INIT_LIST_HEAD(&pool->sp_threads);
417 INIT_LIST_HEAD(&pool->sp_sockets);
Greg Banksa7455442006-10-02 02:17:59 -0700418 INIT_LIST_HEAD(&pool->sp_all_threads);
Greg Banks3262c812006-10-02 02:17:58 -0700419 spin_lock_init(&pool->sp_lock);
420 }
421
422
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 /* Remove any stale portmap registrations */
424 svc_register(serv, 0, 0);
425
426 return serv;
427}
428
Greg Banksa7455442006-10-02 02:17:59 -0700429struct svc_serv *
430svc_create(struct svc_program *prog, unsigned int bufsize,
431 void (*shutdown)(struct svc_serv *serv))
432{
433 return __svc_create(prog, bufsize, /*npools*/1, shutdown);
434}
435
436struct svc_serv *
437svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
438 void (*shutdown)(struct svc_serv *serv),
439 svc_thread_fn func, int sig, struct module *mod)
440{
441 struct svc_serv *serv;
Greg Banks42a7fc42007-03-06 01:42:23 -0800442 unsigned int npools = svc_pool_map_get();
Greg Banksa7455442006-10-02 02:17:59 -0700443
Greg Banksbfd24162006-10-02 02:18:01 -0700444 serv = __svc_create(prog, bufsize, npools, shutdown);
Greg Banksa7455442006-10-02 02:17:59 -0700445
446 if (serv != NULL) {
447 serv->sv_function = func;
448 serv->sv_kill_signal = sig;
449 serv->sv_module = mod;
450 }
451
452 return serv;
453}
454
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455/*
Greg Banks3262c812006-10-02 02:17:58 -0700456 * Destroy an RPC service. Should be called with the BKL held
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 */
458void
459svc_destroy(struct svc_serv *serv)
460{
461 struct svc_sock *svsk;
NeilBrowncda1fd42007-03-06 01:42:22 -0800462 struct svc_sock *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463
Chuck Lever46121cf2007-01-31 12:14:08 -0500464 dprintk("svc: svc_destroy(%s, %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 serv->sv_program->pg_name,
466 serv->sv_nrthreads);
467
468 if (serv->sv_nrthreads) {
469 if (--(serv->sv_nrthreads) != 0) {
470 svc_sock_update_bufs(serv);
471 return;
472 }
473 } else
474 printk("svc_destroy: no threads for serv=%p!\n", serv);
475
Greg Banks36bdfc82006-10-02 02:17:54 -0700476 del_timer_sync(&serv->sv_temptimer);
477
NeilBrowncda1fd42007-03-06 01:42:22 -0800478 list_for_each_entry_safe(svsk, tmp, &serv->sv_tempsocks, sk_list)
479 svc_force_close_socket(svsk);
480
NeilBrownbc591cc2006-10-02 02:17:44 -0700481 if (serv->sv_shutdown)
482 serv->sv_shutdown(serv);
483
NeilBrowncda1fd42007-03-06 01:42:22 -0800484 list_for_each_entry_safe(svsk, tmp, &serv->sv_permsocks, sk_list)
485 svc_force_close_socket(svsk);
486
487 BUG_ON(!list_empty(&serv->sv_permsocks));
488 BUG_ON(!list_empty(&serv->sv_tempsocks));
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800489
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 cache_clean_deferred(serv);
491
Greg Banks42a7fc42007-03-06 01:42:23 -0800492 if (svc_serv_is_pooled(serv))
493 svc_pool_map_put();
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 /* Unregister service with the portmapper */
496 svc_register(serv, 0, 0);
Greg Banks3262c812006-10-02 02:17:58 -0700497 kfree(serv->sv_pools);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 kfree(serv);
499}
500
501/*
502 * Allocate an RPC server's buffer space.
503 * We allocate pages and place them in rq_argpages.
504 */
505static int
506svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
507{
508 int pages;
509 int arghi;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800510
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700511 pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
512 * We assume one is at most one page
513 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 arghi = 0;
Kris Katterjohn09a62662006-01-08 22:24:28 -0800515 BUG_ON(pages > RPCSVC_MAXPAGES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 while (pages) {
517 struct page *p = alloc_page(GFP_KERNEL);
518 if (!p)
519 break;
NeilBrown44524352006-10-04 02:15:46 -0700520 rqstp->rq_pages[arghi++] = p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 pages--;
522 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 return ! pages;
524}
525
526/*
527 * Release an RPC server buffer
528 */
529static void
530svc_release_buffer(struct svc_rqst *rqstp)
531{
NeilBrown44524352006-10-04 02:15:46 -0700532 int i;
533 for (i=0; i<ARRAY_SIZE(rqstp->rq_pages); i++)
534 if (rqstp->rq_pages[i])
535 put_page(rqstp->rq_pages[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536}
537
538/*
Greg Banks3262c812006-10-02 02:17:58 -0700539 * Create a thread in the given pool. Caller must hold BKL.
Greg Banksbfd24162006-10-02 02:18:01 -0700540 * On a NUMA or SMP machine, with a multi-pool serv, the thread
541 * will be restricted to run on the cpus belonging to the pool.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 */
Greg Banks3262c812006-10-02 02:17:58 -0700543static int
544__svc_create_thread(svc_thread_fn func, struct svc_serv *serv,
545 struct svc_pool *pool)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546{
547 struct svc_rqst *rqstp;
548 int error = -ENOMEM;
Greg Banksbfd24162006-10-02 02:18:01 -0700549 int have_oldmask = 0;
550 cpumask_t oldmask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700552 rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 if (!rqstp)
554 goto out;
555
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 init_waitqueue_head(&rqstp->rq_wait);
557
Jesper Juhl12fe2c52006-01-10 13:08:21 -0800558 if (!(rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL))
559 || !(rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL))
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700560 || !svc_init_buffer(rqstp, serv->sv_max_mesg))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 goto out_thread;
562
563 serv->sv_nrthreads++;
Greg Banks3262c812006-10-02 02:17:58 -0700564 spin_lock_bh(&pool->sp_lock);
565 pool->sp_nrthreads++;
Greg Banksa7455442006-10-02 02:17:59 -0700566 list_add(&rqstp->rq_all, &pool->sp_all_threads);
Greg Banks3262c812006-10-02 02:17:58 -0700567 spin_unlock_bh(&pool->sp_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 rqstp->rq_server = serv;
Greg Banks3262c812006-10-02 02:17:58 -0700569 rqstp->rq_pool = pool;
Greg Banksbfd24162006-10-02 02:18:01 -0700570
571 if (serv->sv_nrpools > 1)
572 have_oldmask = svc_pool_map_set_cpumask(pool->sp_id, &oldmask);
573
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 error = kernel_thread((int (*)(void *)) func, rqstp, 0);
Greg Banksbfd24162006-10-02 02:18:01 -0700575
576 if (have_oldmask)
577 set_cpus_allowed(current, oldmask);
578
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 if (error < 0)
580 goto out_thread;
581 svc_sock_update_bufs(serv);
582 error = 0;
583out:
584 return error;
585
586out_thread:
587 svc_exit_thread(rqstp);
588 goto out;
589}
590
591/*
Greg Banks3262c812006-10-02 02:17:58 -0700592 * Create a thread in the default pool. Caller must hold BKL.
593 */
594int
595svc_create_thread(svc_thread_fn func, struct svc_serv *serv)
596{
597 return __svc_create_thread(func, serv, &serv->sv_pools[0]);
598}
599
600/*
Greg Banksa7455442006-10-02 02:17:59 -0700601 * Choose a pool in which to create a new thread, for svc_set_num_threads
602 */
603static inline struct svc_pool *
604choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
605{
606 if (pool != NULL)
607 return pool;
608
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800609 return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
Greg Banksa7455442006-10-02 02:17:59 -0700610}
611
612/*
613 * Choose a thread to kill, for svc_set_num_threads
614 */
615static inline struct task_struct *
616choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
617{
618 unsigned int i;
619 struct task_struct *task = NULL;
620
621 if (pool != NULL) {
622 spin_lock_bh(&pool->sp_lock);
623 } else {
624 /* choose a pool in round-robin fashion */
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800625 for (i = 0; i < serv->sv_nrpools; i++) {
626 pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
Greg Banksa7455442006-10-02 02:17:59 -0700627 spin_lock_bh(&pool->sp_lock);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800628 if (!list_empty(&pool->sp_all_threads))
629 goto found_pool;
Greg Banksa7455442006-10-02 02:17:59 -0700630 spin_unlock_bh(&pool->sp_lock);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800631 }
Greg Banksa7455442006-10-02 02:17:59 -0700632 return NULL;
633 }
634
635found_pool:
636 if (!list_empty(&pool->sp_all_threads)) {
637 struct svc_rqst *rqstp;
638
639 /*
640 * Remove from the pool->sp_all_threads list
641 * so we don't try to kill it again.
642 */
643 rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all);
644 list_del_init(&rqstp->rq_all);
645 task = rqstp->rq_task;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800646 }
Greg Banksa7455442006-10-02 02:17:59 -0700647 spin_unlock_bh(&pool->sp_lock);
648
649 return task;
650}
651
652/*
653 * Create or destroy enough new threads to make the number
654 * of threads the given number. If `pool' is non-NULL, applies
655 * only to threads in that pool, otherwise round-robins between
656 * all pools. Must be called with a svc_get() reference and
657 * the BKL held.
658 *
659 * Destroying threads relies on the service threads filling in
660 * rqstp->rq_task, which only the nfs ones do. Assumes the serv
661 * has been created using svc_create_pooled().
662 *
663 * Based on code that used to be in nfsd_svc() but tweaked
664 * to be pool-aware.
665 */
666int
667svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
668{
669 struct task_struct *victim;
670 int error = 0;
671 unsigned int state = serv->sv_nrthreads-1;
672
673 if (pool == NULL) {
674 /* The -1 assumes caller has done a svc_get() */
675 nrservs -= (serv->sv_nrthreads-1);
676 } else {
677 spin_lock_bh(&pool->sp_lock);
678 nrservs -= pool->sp_nrthreads;
679 spin_unlock_bh(&pool->sp_lock);
680 }
681
682 /* create new threads */
683 while (nrservs > 0) {
684 nrservs--;
685 __module_get(serv->sv_module);
686 error = __svc_create_thread(serv->sv_function, serv,
687 choose_pool(serv, pool, &state));
688 if (error < 0) {
689 module_put(serv->sv_module);
690 break;
691 }
692 }
693 /* destroy old threads */
694 while (nrservs < 0 &&
695 (victim = choose_victim(serv, pool, &state)) != NULL) {
696 send_sig(serv->sv_kill_signal, victim, 1);
697 nrservs++;
698 }
699
700 return error;
701}
702
703/*
Greg Banks3262c812006-10-02 02:17:58 -0700704 * Called from a server thread as it's exiting. Caller must hold BKL.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 */
706void
707svc_exit_thread(struct svc_rqst *rqstp)
708{
709 struct svc_serv *serv = rqstp->rq_server;
Greg Banks3262c812006-10-02 02:17:58 -0700710 struct svc_pool *pool = rqstp->rq_pool;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
712 svc_release_buffer(rqstp);
Jesper Juhla51482b2005-11-08 09:41:34 -0800713 kfree(rqstp->rq_resp);
714 kfree(rqstp->rq_argp);
715 kfree(rqstp->rq_auth_data);
Greg Banks3262c812006-10-02 02:17:58 -0700716
717 spin_lock_bh(&pool->sp_lock);
718 pool->sp_nrthreads--;
Greg Banksa7455442006-10-02 02:17:59 -0700719 list_del(&rqstp->rq_all);
Greg Banks3262c812006-10-02 02:17:58 -0700720 spin_unlock_bh(&pool->sp_lock);
721
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 kfree(rqstp);
723
724 /* Release the server */
725 if (serv)
726 svc_destroy(serv);
727}
728
729/*
730 * Register an RPC service with the local portmapper.
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800731 * To unregister a service, call this routine with
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 * proto and port == 0.
733 */
734int
735svc_register(struct svc_serv *serv, int proto, unsigned short port)
736{
737 struct svc_program *progp;
738 unsigned long flags;
739 int i, error = 0, dummy;
740
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 if (!port)
742 clear_thread_flag(TIF_SIGPENDING);
743
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700744 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
745 for (i = 0; i < progp->pg_nvers; i++) {
746 if (progp->pg_vers[i] == NULL)
747 continue;
748
Chuck Lever46121cf2007-01-31 12:14:08 -0500749 dprintk("svc: svc_register(%s, %s, %d, %d)%s\n",
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700750 progp->pg_name,
751 proto == IPPROTO_UDP? "udp" : "tcp",
752 port,
753 i,
754 progp->pg_vers[i]->vs_hidden?
755 " (but not telling portmap)" : "");
756
757 if (progp->pg_vers[i]->vs_hidden)
758 continue;
759
Chuck Lever26080012007-03-29 16:48:16 -0400760 error = rpcb_register(progp->pg_prog, i, proto, port, &dummy);
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700761 if (error < 0)
762 break;
763 if (port && !dummy) {
764 error = -EACCES;
765 break;
766 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 }
768 }
769
770 if (!port) {
771 spin_lock_irqsave(&current->sighand->siglock, flags);
772 recalc_sigpending();
773 spin_unlock_irqrestore(&current->sighand->siglock, flags);
774 }
775
776 return error;
777}
778
779/*
780 * Process the RPC request.
781 */
782int
NeilBrown6fb2b472006-10-02 02:17:50 -0700783svc_process(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784{
785 struct svc_program *progp;
786 struct svc_version *versp = NULL; /* compiler food */
787 struct svc_procedure *procp = NULL;
788 struct kvec * argv = &rqstp->rq_arg.head[0];
789 struct kvec * resv = &rqstp->rq_res.head[0];
NeilBrown6fb2b472006-10-02 02:17:50 -0700790 struct svc_serv *serv = rqstp->rq_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 kxdrproc_t xdr;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -0700792 __be32 *statp;
793 u32 dir, prog, vers, proc;
794 __be32 auth_stat, rpc_stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 int auth_res;
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -0700796 __be32 *reply_statp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797
798 rpc_stat = rpc_success;
799
800 if (argv->iov_len < 6*4)
801 goto err_short_len;
802
803 /* setup response xdr_buf.
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800804 * Initially it has just one page
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 */
NeilBrown44524352006-10-04 02:15:46 -0700806 rqstp->rq_resused = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 resv->iov_base = page_address(rqstp->rq_respages[0]);
808 resv->iov_len = 0;
NeilBrown44524352006-10-04 02:15:46 -0700809 rqstp->rq_res.pages = rqstp->rq_respages + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 rqstp->rq_res.len = 0;
811 rqstp->rq_res.page_base = 0;
812 rqstp->rq_res.page_len = 0;
Trond Myklebust334ccfd2005-06-22 17:16:19 +0000813 rqstp->rq_res.buflen = PAGE_SIZE;
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -0700814 rqstp->rq_res.tail[0].iov_base = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 rqstp->rq_res.tail[0].iov_len = 0;
J. Bruce Fields5c04c462006-06-30 01:56:19 -0700816 /* Will be turned off only in gss privacy case: */
Jens Axboecf8208d2007-06-12 21:22:14 +0200817 rqstp->rq_splice_ok = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 /* tcp needs a space for the record length... */
819 if (rqstp->rq_prot == IPPROTO_TCP)
Alexey Dobriyan76994312006-09-26 22:28:46 -0700820 svc_putnl(resv, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
822 rqstp->rq_xid = svc_getu32(argv);
823 svc_putu32(resv, rqstp->rq_xid);
824
Alexey Dobriyan76994312006-09-26 22:28:46 -0700825 dir = svc_getnl(argv);
826 vers = svc_getnl(argv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
828 /* First words of reply: */
Alexey Dobriyan76994312006-09-26 22:28:46 -0700829 svc_putnl(resv, 1); /* REPLY */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
831 if (dir != 0) /* direction != CALL */
832 goto err_bad_dir;
833 if (vers != 2) /* RPC version number */
834 goto err_bad_rpc;
835
836 /* Save position in case we later decide to reject: */
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -0700837 reply_statp = resv->iov_base + resv->iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
Alexey Dobriyan76994312006-09-26 22:28:46 -0700839 svc_putnl(resv, 0); /* ACCEPT */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840
Alexey Dobriyan76994312006-09-26 22:28:46 -0700841 rqstp->rq_prog = prog = svc_getnl(argv); /* program number */
842 rqstp->rq_vers = vers = svc_getnl(argv); /* version number */
843 rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844
845 progp = serv->sv_program;
NeilBrown80d188a2005-11-07 01:00:27 -0800846
847 for (progp = serv->sv_program; progp; progp = progp->pg_next)
848 if (prog == progp->pg_prog)
849 break;
850
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 /*
852 * Decode auth data, and add verifier to reply buffer.
853 * We do this before anything else in order to get a decent
854 * auth verifier.
855 */
856 auth_res = svc_authenticate(rqstp, &auth_stat);
857 /* Also give the program a chance to reject this call: */
NeilBrown80d188a2005-11-07 01:00:27 -0800858 if (auth_res == SVC_OK && progp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 auth_stat = rpc_autherr_badcred;
860 auth_res = progp->pg_authenticate(rqstp);
861 }
862 switch (auth_res) {
863 case SVC_OK:
864 break;
865 case SVC_GARBAGE:
866 rpc_stat = rpc_garbage_args;
867 goto err_bad;
868 case SVC_SYSERR:
869 rpc_stat = rpc_system_err;
870 goto err_bad;
871 case SVC_DENIED:
872 goto err_bad_auth;
873 case SVC_DROP:
874 goto dropit;
875 case SVC_COMPLETE:
876 goto sendit;
877 }
NeilBrown80d188a2005-11-07 01:00:27 -0800878
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +0000879 if (progp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 goto err_bad_prog;
881
882 if (vers >= progp->pg_nvers ||
883 !(versp = progp->pg_vers[vers]))
884 goto err_bad_vers;
885
886 procp = versp->vs_proc + proc;
887 if (proc >= versp->vs_nproc || !procp->pc_func)
888 goto err_bad_proc;
889 rqstp->rq_server = serv;
890 rqstp->rq_procinfo = procp;
891
892 /* Syntactic check complete */
893 serv->sv_stats->rpccnt++;
894
895 /* Build the reply header. */
896 statp = resv->iov_base +resv->iov_len;
Alexey Dobriyan76994312006-09-26 22:28:46 -0700897 svc_putnl(resv, RPC_SUCCESS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
899 /* Bump per-procedure stats counter */
900 procp->pc_count++;
901
902 /* Initialize storage for argp and resp */
903 memset(rqstp->rq_argp, 0, procp->pc_argsize);
904 memset(rqstp->rq_resp, 0, procp->pc_ressize);
905
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800906 /* un-reserve some of the out-queue now that we have a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 * better idea of reply size
908 */
909 if (procp->pc_xdrressize)
Jeff Laytoncd123012007-05-09 02:34:50 -0700910 svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911
912 /* Call the function that processes the request. */
913 if (!versp->vs_dispatch) {
914 /* Decode arguments */
915 xdr = procp->pc_decode;
916 if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
917 goto err_garbage;
918
919 *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
920
921 /* Encode reply */
NeilBrownd343fce2006-10-17 00:10:18 -0700922 if (*statp == rpc_drop_reply) {
923 if (procp->pc_release)
924 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
925 goto dropit;
926 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 if (*statp == rpc_success && (xdr = procp->pc_encode)
928 && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
929 dprintk("svc: failed to encode reply\n");
930 /* serv->sv_stats->rpcsystemerr++; */
931 *statp = rpc_system_err;
932 }
933 } else {
934 dprintk("svc: calling dispatcher\n");
935 if (!versp->vs_dispatch(rqstp, statp)) {
936 /* Release reply info */
937 if (procp->pc_release)
938 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
939 goto dropit;
940 }
941 }
942
943 /* Check RPC status result */
944 if (*statp != rpc_success)
945 resv->iov_len = ((void*)statp) - resv->iov_base + 4;
946
947 /* Release reply info */
948 if (procp->pc_release)
949 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
950
951 if (procp->pc_encode == NULL)
952 goto dropit;
953
954 sendit:
955 if (svc_authorise(rqstp))
956 goto dropit;
957 return svc_send(rqstp);
958
959 dropit:
960 svc_authorise(rqstp); /* doesn't hurt to call this twice */
961 dprintk("svc: svc_process dropit\n");
962 svc_drop(rqstp);
963 return 0;
964
965err_short_len:
NeilBrown34e9a632007-01-29 13:19:52 -0800966 if (net_ratelimit())
967 printk("svc: short len %Zd, dropping request\n", argv->iov_len);
968
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 goto dropit; /* drop request */
970
971err_bad_dir:
NeilBrown34e9a632007-01-29 13:19:52 -0800972 if (net_ratelimit())
973 printk("svc: bad direction %d, dropping request\n", dir);
974
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 serv->sv_stats->rpcbadfmt++;
976 goto dropit; /* drop request */
977
978err_bad_rpc:
979 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -0700980 svc_putnl(resv, 1); /* REJECT */
981 svc_putnl(resv, 0); /* RPC_MISMATCH */
982 svc_putnl(resv, 2); /* Only RPCv2 supported */
983 svc_putnl(resv, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 goto sendit;
985
986err_bad_auth:
987 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
988 serv->sv_stats->rpcbadauth++;
989 /* Restore write pointer to location of accept status: */
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -0700990 xdr_ressize_check(rqstp, reply_statp);
Alexey Dobriyan76994312006-09-26 22:28:46 -0700991 svc_putnl(resv, 1); /* REJECT */
992 svc_putnl(resv, 1); /* AUTH_ERROR */
993 svc_putnl(resv, ntohl(auth_stat)); /* status */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 goto sendit;
995
996err_bad_prog:
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +0000997 dprintk("svc: unknown program %d\n", prog);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -0700999 svc_putnl(resv, RPC_PROG_UNAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 goto sendit;
1001
1002err_bad_vers:
NeilBrown34e9a632007-01-29 13:19:52 -08001003 if (net_ratelimit())
1004 printk("svc: unknown version (%d for prog %d, %s)\n",
1005 vers, prog, progp->pg_name);
1006
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001008 svc_putnl(resv, RPC_PROG_MISMATCH);
1009 svc_putnl(resv, progp->pg_lovers);
1010 svc_putnl(resv, progp->pg_hivers);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 goto sendit;
1012
1013err_bad_proc:
NeilBrown34e9a632007-01-29 13:19:52 -08001014 if (net_ratelimit())
1015 printk("svc: unknown procedure (%d)\n", proc);
1016
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001018 svc_putnl(resv, RPC_PROC_UNAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 goto sendit;
1020
1021err_garbage:
NeilBrown34e9a632007-01-29 13:19:52 -08001022 if (net_ratelimit())
1023 printk("svc: failed to decode args\n");
1024
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 rpc_stat = rpc_garbage_args;
1026err_bad:
1027 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001028 svc_putnl(resv, ntohl(rpc_stat));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 goto sendit;
1030}
Greg Banks7adae482006-10-04 02:15:47 -07001031
1032/*
1033 * Return (transport-specific) limit on the rpc payload.
1034 */
1035u32 svc_max_payload(const struct svc_rqst *rqstp)
1036{
1037 int max = RPCSVC_MAXPAYLOAD_TCP;
1038
1039 if (rqstp->rq_sock->sk_sock->type == SOCK_DGRAM)
1040 max = RPCSVC_MAXPAYLOAD_UDP;
NeilBrownc6b0a9f2006-10-06 00:44:05 -07001041 if (rqstp->rq_server->sv_max_payload < max)
1042 max = rqstp->rq_server->sv_max_payload;
Greg Banks7adae482006-10-04 02:15:47 -07001043 return max;
1044}
1045EXPORT_SYMBOL_GPL(svc_max_payload);