blob: a2d3330b70dece76e07fb75f6ec414ccc6bb7df9 [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>
Jeff Layton9867d762008-06-10 08:40:38 -040021#include <linux/kthread.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
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>
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -040029#include <linux/sunrpc/bc_xprt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31#define RPCDBG_FACILITY RPCDBG_SVCDSP
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +040033static void svc_unregister(const struct svc_serv *serv, struct net *net);
Chuck Lever7252d572008-08-18 19:34:08 -040034
Greg Banks42a7fc42007-03-06 01:42:23 -080035#define svc_serv_is_pooled(serv) ((serv)->sv_function)
36
Linus Torvalds1da177e2005-04-16 15:20:36 -070037/*
Greg Banksbfd24162006-10-02 02:18:01 -070038 * Mode for mapping cpus to pools.
39 */
40enum {
Greg Banks42a7fc42007-03-06 01:42:23 -080041 SVC_POOL_AUTO = -1, /* choose one of the others */
Greg Banksbfd24162006-10-02 02:18:01 -070042 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};
Greg Banks42a7fc42007-03-06 01:42:23 -080047#define SVC_POOL_DEFAULT SVC_POOL_GLOBAL
Greg Banksbfd24162006-10-02 02:18:01 -070048
49/*
50 * Structure for mapping cpus to pools and vice versa.
51 * Setup once during sunrpc initialisation.
52 */
53static struct svc_pool_map {
Greg Banks42a7fc42007-03-06 01:42:23 -080054 int count; /* How many svc_servs use us */
Greg Banksbfd24162006-10-02 02:18:01 -070055 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 = {
Greg Banks42a7fc42007-03-06 01:42:23 -080062 .count = 0,
63 .mode = SVC_POOL_DEFAULT
Greg Banksbfd24162006-10-02 02:18:01 -070064};
Greg Banks42a7fc42007-03-06 01:42:23 -080065static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */
Greg Banksbfd24162006-10-02 02:18:01 -070066
Greg Banks42a7fc42007-03-06 01:42:23 -080067static int
68param_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
92out:
93 mutex_unlock(&svc_pool_map_mutex);
94 return err;
95}
96
97static int
98param_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}
116
117module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode,
118 &svc_pool_map.mode, 0644);
Greg Banksbfd24162006-10-02 02:18:01 -0700119
120/*
121 * Detect best pool mapping mode heuristically,
122 * according to the machine's topology.
123 */
124static int
125svc_pool_map_choose_mode(void)
126{
127 unsigned int node;
128
Christoph Lameter62bc62a2009-06-16 15:32:15 -0700129 if (nr_online_nodes > 1) {
Greg Banksbfd24162006-10-02 02:18:01 -0700130 /*
131 * Actually have multiple NUMA nodes,
132 * so split pools on NUMA node boundaries
133 */
134 return SVC_POOL_PERNODE;
135 }
136
H Hartley Sweeten72c33682010-03-05 13:42:43 -0800137 node = first_online_node;
Greg Banksbfd24162006-10-02 02:18:01 -0700138 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 */
156static int
157svc_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
168fail_free:
169 kfree(m->to_pool);
J. Bruce Fields61c85042011-12-22 18:22:49 -0700170 m->to_pool = NULL;
Greg Banksbfd24162006-10-02 02:18:01 -0700171fail:
172 return -ENOMEM;
173}
174
175/*
176 * Initialise the pool map for SVC_POOL_PERCPU mode.
177 * Returns number of pools or <0 on error.
178 */
179static int
180svc_pool_map_init_percpu(struct svc_pool_map *m)
181{
Christoph Lameter53b8a312007-02-20 13:57:51 -0800182 unsigned int maxpools = nr_cpu_ids;
Greg Banksbfd24162006-10-02 02:18:01 -0700183 unsigned int pidx = 0;
184 unsigned int cpu;
185 int err;
186
187 err = svc_pool_map_alloc_arrays(m, maxpools);
188 if (err)
189 return err;
190
191 for_each_online_cpu(cpu) {
192 BUG_ON(pidx > maxpools);
193 m->to_pool[cpu] = pidx;
194 m->pool_to[pidx] = cpu;
195 pidx++;
196 }
197 /* cpus brought online later all get mapped to pool0, sorry */
198
199 return pidx;
200};
201
202
203/*
204 * Initialise the pool map for SVC_POOL_PERNODE mode.
205 * Returns number of pools or <0 on error.
206 */
207static int
208svc_pool_map_init_pernode(struct svc_pool_map *m)
209{
Christoph Lameter74c7aa82007-02-20 13:57:51 -0800210 unsigned int maxpools = nr_node_ids;
Greg Banksbfd24162006-10-02 02:18:01 -0700211 unsigned int pidx = 0;
212 unsigned int node;
213 int err;
214
215 err = svc_pool_map_alloc_arrays(m, maxpools);
216 if (err)
217 return err;
218
219 for_each_node_with_cpus(node) {
220 /* some architectures (e.g. SN2) have cpuless nodes */
221 BUG_ON(pidx > maxpools);
222 m->to_pool[node] = pidx;
223 m->pool_to[pidx] = node;
224 pidx++;
225 }
226 /* nodes brought online later all get mapped to pool0, sorry */
227
228 return pidx;
229}
230
231
232/*
Greg Banks42a7fc42007-03-06 01:42:23 -0800233 * Add a reference to the global map of cpus to pools (and
234 * vice versa). Initialise the map if we're the first user.
235 * Returns the number of pools.
Greg Banksbfd24162006-10-02 02:18:01 -0700236 */
237static unsigned int
Greg Banks42a7fc42007-03-06 01:42:23 -0800238svc_pool_map_get(void)
Greg Banksbfd24162006-10-02 02:18:01 -0700239{
240 struct svc_pool_map *m = &svc_pool_map;
241 int npools = -1;
242
Greg Banks42a7fc42007-03-06 01:42:23 -0800243 mutex_lock(&svc_pool_map_mutex);
Greg Banksbfd24162006-10-02 02:18:01 -0700244
Greg Banks42a7fc42007-03-06 01:42:23 -0800245 if (m->count++) {
246 mutex_unlock(&svc_pool_map_mutex);
247 return m->npools;
248 }
249
250 if (m->mode == SVC_POOL_AUTO)
251 m->mode = svc_pool_map_choose_mode();
Greg Banksbfd24162006-10-02 02:18:01 -0700252
253 switch (m->mode) {
254 case SVC_POOL_PERCPU:
255 npools = svc_pool_map_init_percpu(m);
256 break;
257 case SVC_POOL_PERNODE:
258 npools = svc_pool_map_init_pernode(m);
259 break;
260 }
261
262 if (npools < 0) {
263 /* default, or memory allocation failure */
264 npools = 1;
265 m->mode = SVC_POOL_GLOBAL;
266 }
267 m->npools = npools;
268
Greg Banks42a7fc42007-03-06 01:42:23 -0800269 mutex_unlock(&svc_pool_map_mutex);
Greg Banksbfd24162006-10-02 02:18:01 -0700270 return m->npools;
271}
272
Greg Banks42a7fc42007-03-06 01:42:23 -0800273
274/*
275 * Drop a reference to the global map of cpus to pools.
276 * When the last reference is dropped, the map data is
277 * freed; this allows the sysadmin to change the pool
278 * mode using the pool_mode module option without
279 * rebooting or re-loading sunrpc.ko.
280 */
281static void
282svc_pool_map_put(void)
283{
284 struct svc_pool_map *m = &svc_pool_map;
285
286 mutex_lock(&svc_pool_map_mutex);
287
288 if (!--m->count) {
Greg Banks42a7fc42007-03-06 01:42:23 -0800289 kfree(m->to_pool);
J. Bruce Fields61c85042011-12-22 18:22:49 -0700290 m->to_pool = NULL;
Greg Banks42a7fc42007-03-06 01:42:23 -0800291 kfree(m->pool_to);
J. Bruce Fields61c85042011-12-22 18:22:49 -0700292 m->pool_to = NULL;
Greg Banks42a7fc42007-03-06 01:42:23 -0800293 m->npools = 0;
294 }
295
296 mutex_unlock(&svc_pool_map_mutex);
297}
298
299
Eric Dumazet11fd1652011-07-28 20:04:09 +0200300static int svc_pool_map_get_node(unsigned int pidx)
301{
302 const struct svc_pool_map *m = &svc_pool_map;
303
304 if (m->count) {
305 if (m->mode == SVC_POOL_PERCPU)
306 return cpu_to_node(m->pool_to[pidx]);
307 if (m->mode == SVC_POOL_PERNODE)
308 return m->pool_to[pidx];
309 }
310 return NUMA_NO_NODE;
311}
Greg Banksbfd24162006-10-02 02:18:01 -0700312/*
Jeff Layton9867d762008-06-10 08:40:38 -0400313 * Set the given thread's cpus_allowed mask so that it
Greg Banksbfd24162006-10-02 02:18:01 -0700314 * will only run on cpus in the given pool.
Greg Banksbfd24162006-10-02 02:18:01 -0700315 */
Jeff Layton9867d762008-06-10 08:40:38 -0400316static inline void
317svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
Greg Banksbfd24162006-10-02 02:18:01 -0700318{
319 struct svc_pool_map *m = &svc_pool_map;
Jeff Layton9867d762008-06-10 08:40:38 -0400320 unsigned int node = m->pool_to[pidx];
Greg Banksbfd24162006-10-02 02:18:01 -0700321
322 /*
323 * The caller checks for sv_nrpools > 1, which
Greg Banks42a7fc42007-03-06 01:42:23 -0800324 * implies that we've been initialized.
Greg Banksbfd24162006-10-02 02:18:01 -0700325 */
Greg Banks42a7fc42007-03-06 01:42:23 -0800326 BUG_ON(m->count == 0);
Greg Banksbfd24162006-10-02 02:18:01 -0700327
Jeff Layton9867d762008-06-10 08:40:38 -0400328 switch (m->mode) {
Greg Banksbfd24162006-10-02 02:18:01 -0700329 case SVC_POOL_PERCPU:
Mike Travisc5f59f02008-04-04 18:11:10 -0700330 {
Rusty Russellaa85ea52009-03-30 22:05:15 -0600331 set_cpus_allowed_ptr(task, cpumask_of(node));
Jeff Layton9867d762008-06-10 08:40:38 -0400332 break;
Mike Travisc5f59f02008-04-04 18:11:10 -0700333 }
Greg Banksbfd24162006-10-02 02:18:01 -0700334 case SVC_POOL_PERNODE:
Mike Travisc5f59f02008-04-04 18:11:10 -0700335 {
Rusty Russella70f7302009-03-13 14:49:46 +1030336 set_cpus_allowed_ptr(task, cpumask_of_node(node));
Jeff Layton9867d762008-06-10 08:40:38 -0400337 break;
Greg Banksbfd24162006-10-02 02:18:01 -0700338 }
Mike Travisc5f59f02008-04-04 18:11:10 -0700339 }
Greg Banksbfd24162006-10-02 02:18:01 -0700340}
341
342/*
343 * Use the mapping mode to choose a pool for a given CPU.
344 * Used when enqueueing an incoming RPC. Always returns
345 * a non-NULL pool pointer.
346 */
347struct svc_pool *
348svc_pool_for_cpu(struct svc_serv *serv, int cpu)
349{
350 struct svc_pool_map *m = &svc_pool_map;
351 unsigned int pidx = 0;
352
353 /*
Greg Banks42a7fc42007-03-06 01:42:23 -0800354 * An uninitialised map happens in a pure client when
Greg Banksbfd24162006-10-02 02:18:01 -0700355 * lockd is brought up, so silently treat it the
356 * same as SVC_POOL_GLOBAL.
357 */
Greg Banks42a7fc42007-03-06 01:42:23 -0800358 if (svc_serv_is_pooled(serv)) {
359 switch (m->mode) {
360 case SVC_POOL_PERCPU:
361 pidx = m->to_pool[cpu];
362 break;
363 case SVC_POOL_PERNODE:
364 pidx = m->to_pool[cpu_to_node(cpu)];
365 break;
366 }
Greg Banksbfd24162006-10-02 02:18:01 -0700367 }
368 return &serv->sv_pools[pidx % serv->sv_nrpools];
369}
370
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300371static int svc_rpcb_setup(struct svc_serv *serv)
372{
373 int err;
374
Stanislav Kinsburskyf7a30c12012-01-13 12:52:51 +0400375 err = rpcb_create_local(&init_net);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300376 if (err)
377 return err;
378
379 /* Remove any stale portmap registrations */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400380 svc_unregister(serv, &init_net);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300381 return 0;
382}
383
Stanislav Kinsbursky16d05872011-10-25 14:17:28 +0300384void svc_rpcb_cleanup(struct svc_serv *serv)
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300385{
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400386 svc_unregister(serv, &init_net);
Stanislav Kinsburskyf7a30c12012-01-13 12:52:51 +0400387 rpcb_put_local(&init_net);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300388}
Stanislav Kinsbursky16d05872011-10-25 14:17:28 +0300389EXPORT_SYMBOL_GPL(svc_rpcb_cleanup);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300390
391static int svc_uses_rpcbind(struct svc_serv *serv)
392{
393 struct svc_program *progp;
394 unsigned int i;
395
396 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
397 for (i = 0; i < progp->pg_nvers; i++) {
398 if (progp->pg_vers[i] == NULL)
399 continue;
400 if (progp->pg_vers[i]->vs_hidden == 0)
401 return 1;
402 }
403 }
404
405 return 0;
406}
Greg Banksbfd24162006-10-02 02:18:01 -0700407
408/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 * Create an RPC service
410 */
Greg Banksa7455442006-10-02 02:17:59 -0700411static struct svc_serv *
412__svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
Chuck Lever49a90722009-03-18 20:46:29 -0400413 void (*shutdown)(struct svc_serv *serv))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414{
415 struct svc_serv *serv;
Chuck Leverea339d42007-10-26 13:32:56 -0400416 unsigned int vers;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 unsigned int xdrsize;
Greg Banks3262c812006-10-02 02:17:58 -0700418 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700420 if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 return NULL;
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +0000422 serv->sv_name = prog->pg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 serv->sv_program = prog;
424 serv->sv_nrthreads = 1;
425 serv->sv_stats = prog->pg_stats;
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700426 if (bufsize > RPCSVC_MAXPAYLOAD)
427 bufsize = RPCSVC_MAXPAYLOAD;
428 serv->sv_max_payload = bufsize? bufsize : 4096;
429 serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE);
NeilBrownbc591cc2006-10-02 02:17:44 -0700430 serv->sv_shutdown = shutdown;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 xdrsize = 0;
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +0000432 while (prog) {
433 prog->pg_lovers = prog->pg_nvers-1;
434 for (vers=0; vers<prog->pg_nvers ; vers++)
435 if (prog->pg_vers[vers]) {
436 prog->pg_hivers = vers;
437 if (prog->pg_lovers > vers)
438 prog->pg_lovers = vers;
439 if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
440 xdrsize = prog->pg_vers[vers]->vs_xdrsize;
441 }
442 prog = prog->pg_next;
443 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 serv->sv_xdrsize = xdrsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 INIT_LIST_HEAD(&serv->sv_tempsocks);
446 INIT_LIST_HEAD(&serv->sv_permsocks);
Greg Banks36bdfc82006-10-02 02:17:54 -0700447 init_timer(&serv->sv_temptimer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 spin_lock_init(&serv->sv_lock);
449
Greg Banksa7455442006-10-02 02:17:59 -0700450 serv->sv_nrpools = npools;
Greg Banks3262c812006-10-02 02:17:58 -0700451 serv->sv_pools =
Robert P. J. Daycd861282006-12-13 00:34:52 -0800452 kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
Greg Banks3262c812006-10-02 02:17:58 -0700453 GFP_KERNEL);
454 if (!serv->sv_pools) {
455 kfree(serv);
456 return NULL;
457 }
458
459 for (i = 0; i < serv->sv_nrpools; i++) {
460 struct svc_pool *pool = &serv->sv_pools[i];
461
Chuck Lever46121cf2007-01-31 12:14:08 -0500462 dprintk("svc: initialising pool %u for %s\n",
Greg Banks3262c812006-10-02 02:17:58 -0700463 i, serv->sv_name);
464
465 pool->sp_id = i;
466 INIT_LIST_HEAD(&pool->sp_threads);
467 INIT_LIST_HEAD(&pool->sp_sockets);
Greg Banksa7455442006-10-02 02:17:59 -0700468 INIT_LIST_HEAD(&pool->sp_all_threads);
Greg Banks3262c812006-10-02 02:17:58 -0700469 spin_lock_init(&pool->sp_lock);
470 }
471
Stanislav Kinsburskye40f5e22011-10-25 14:17:08 +0300472 if (svc_uses_rpcbind(serv)) {
473 if (svc_rpcb_setup(serv) < 0) {
474 kfree(serv->sv_pools);
475 kfree(serv);
476 return NULL;
477 }
478 if (!serv->sv_shutdown)
479 serv->sv_shutdown = svc_rpcb_cleanup;
480 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
482 return serv;
483}
484
Greg Banksa7455442006-10-02 02:17:59 -0700485struct svc_serv *
486svc_create(struct svc_program *prog, unsigned int bufsize,
Chuck Lever49a90722009-03-18 20:46:29 -0400487 void (*shutdown)(struct svc_serv *serv))
Greg Banksa7455442006-10-02 02:17:59 -0700488{
Chuck Lever49a90722009-03-18 20:46:29 -0400489 return __svc_create(prog, bufsize, /*npools*/1, shutdown);
Greg Banksa7455442006-10-02 02:17:59 -0700490}
Trond Myklebust24c37672008-12-23 16:30:12 -0500491EXPORT_SYMBOL_GPL(svc_create);
Greg Banksa7455442006-10-02 02:17:59 -0700492
493struct svc_serv *
494svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
Chuck Lever49a90722009-03-18 20:46:29 -0400495 void (*shutdown)(struct svc_serv *serv),
Jeff Laytona75c5d02008-06-10 08:40:39 -0400496 svc_thread_fn func, struct module *mod)
Greg Banksa7455442006-10-02 02:17:59 -0700497{
498 struct svc_serv *serv;
Greg Banks42a7fc42007-03-06 01:42:23 -0800499 unsigned int npools = svc_pool_map_get();
Greg Banksa7455442006-10-02 02:17:59 -0700500
Chuck Lever49a90722009-03-18 20:46:29 -0400501 serv = __svc_create(prog, bufsize, npools, shutdown);
Greg Banksa7455442006-10-02 02:17:59 -0700502
503 if (serv != NULL) {
504 serv->sv_function = func;
Greg Banksa7455442006-10-02 02:17:59 -0700505 serv->sv_module = mod;
506 }
507
508 return serv;
509}
Trond Myklebust24c37672008-12-23 16:30:12 -0500510EXPORT_SYMBOL_GPL(svc_create_pooled);
Greg Banksa7455442006-10-02 02:17:59 -0700511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512/*
Neil Brownbedbdd82008-06-10 08:40:35 -0400513 * Destroy an RPC service. Should be called with appropriate locking to
514 * protect the sv_nrthreads, sv_permsocks and sv_tempsocks.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 */
516void
517svc_destroy(struct svc_serv *serv)
518{
Chuck Lever46121cf2007-01-31 12:14:08 -0500519 dprintk("svc: svc_destroy(%s, %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 serv->sv_program->pg_name,
521 serv->sv_nrthreads);
522
523 if (serv->sv_nrthreads) {
524 if (--(serv->sv_nrthreads) != 0) {
525 svc_sock_update_bufs(serv);
526 return;
527 }
528 } else
529 printk("svc_destroy: no threads for serv=%p!\n", serv);
530
Greg Banks36bdfc82006-10-02 02:17:54 -0700531 del_timer_sync(&serv->sv_temptimer);
J. Bruce Fieldsb4f36f82011-11-29 17:00:26 -0500532 /*
533 * The set of xprts (contained in the sv_tempsocks and
534 * sv_permsocks lists) is now constant, since it is modified
535 * only by accepting new sockets (done by service threads in
536 * svc_recv) or aging old ones (done by sv_temptimer), or
537 * configuration changes (excluded by whatever locking the
538 * caller is using--nfsd_mutex in the case of nfsd). So it's
539 * safe to traverse those lists and shut everything down:
540 */
J. Bruce Fields2fefb8a2011-11-29 11:35:35 -0500541 svc_close_all(serv);
NeilBrowncda1fd42007-03-06 01:42:22 -0800542
NeilBrownbc591cc2006-10-02 02:17:44 -0700543 if (serv->sv_shutdown)
544 serv->sv_shutdown(serv);
545
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 cache_clean_deferred(serv);
547
Greg Banks42a7fc42007-03-06 01:42:23 -0800548 if (svc_serv_is_pooled(serv))
549 svc_pool_map_put();
550
Greg Banks3262c812006-10-02 02:17:58 -0700551 kfree(serv->sv_pools);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 kfree(serv);
553}
Trond Myklebust24c37672008-12-23 16:30:12 -0500554EXPORT_SYMBOL_GPL(svc_destroy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
556/*
557 * Allocate an RPC server's buffer space.
558 * We allocate pages and place them in rq_argpages.
559 */
560static int
Eric Dumazet11fd1652011-07-28 20:04:09 +0200561svc_init_buffer(struct svc_rqst *rqstp, unsigned int size, int node)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562{
Chuck Lever0dc220f2008-04-14 12:27:52 -0400563 unsigned int pages, arghi;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800564
Andy Adamsonba176862010-01-26 21:24:04 -0500565 /* bc_xprt uses fore channel allocated buffers */
566 if (svc_is_backchannel(rqstp))
567 return 1;
568
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700569 pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
570 * We assume one is at most one page
571 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 arghi = 0;
Kris Katterjohn09a62662006-01-08 22:24:28 -0800573 BUG_ON(pages > RPCSVC_MAXPAGES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 while (pages) {
Eric Dumazet11fd1652011-07-28 20:04:09 +0200575 struct page *p = alloc_pages_node(node, GFP_KERNEL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 if (!p)
577 break;
NeilBrown44524352006-10-04 02:15:46 -0700578 rqstp->rq_pages[arghi++] = p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 pages--;
580 }
Chuck Lever0dc220f2008-04-14 12:27:52 -0400581 return pages == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582}
583
584/*
585 * Release an RPC server buffer
586 */
587static void
588svc_release_buffer(struct svc_rqst *rqstp)
589{
Chuck Lever50c8bb12008-04-14 12:27:45 -0400590 unsigned int i;
591
592 for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++)
NeilBrown44524352006-10-04 02:15:46 -0700593 if (rqstp->rq_pages[i])
594 put_page(rqstp->rq_pages[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595}
596
Jeff Layton0113ab32008-01-29 10:30:54 -0500597struct svc_rqst *
Eric Dumazet11fd1652011-07-28 20:04:09 +0200598svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool, int node)
Jeff Layton0113ab32008-01-29 10:30:54 -0500599{
600 struct svc_rqst *rqstp;
601
Eric Dumazet11fd1652011-07-28 20:04:09 +0200602 rqstp = kzalloc_node(sizeof(*rqstp), GFP_KERNEL, node);
Jeff Layton0113ab32008-01-29 10:30:54 -0500603 if (!rqstp)
604 goto out_enomem;
605
606 init_waitqueue_head(&rqstp->rq_wait);
607
608 serv->sv_nrthreads++;
609 spin_lock_bh(&pool->sp_lock);
610 pool->sp_nrthreads++;
611 list_add(&rqstp->rq_all, &pool->sp_all_threads);
612 spin_unlock_bh(&pool->sp_lock);
613 rqstp->rq_server = serv;
614 rqstp->rq_pool = pool;
615
Eric Dumazet11fd1652011-07-28 20:04:09 +0200616 rqstp->rq_argp = kmalloc_node(serv->sv_xdrsize, GFP_KERNEL, node);
Jeff Layton0113ab32008-01-29 10:30:54 -0500617 if (!rqstp->rq_argp)
618 goto out_thread;
619
Eric Dumazet11fd1652011-07-28 20:04:09 +0200620 rqstp->rq_resp = kmalloc_node(serv->sv_xdrsize, GFP_KERNEL, node);
Jeff Layton0113ab32008-01-29 10:30:54 -0500621 if (!rqstp->rq_resp)
622 goto out_thread;
623
Eric Dumazet11fd1652011-07-28 20:04:09 +0200624 if (!svc_init_buffer(rqstp, serv->sv_max_mesg, node))
Jeff Layton0113ab32008-01-29 10:30:54 -0500625 goto out_thread;
626
627 return rqstp;
628out_thread:
629 svc_exit_thread(rqstp);
630out_enomem:
631 return ERR_PTR(-ENOMEM);
632}
Trond Myklebust24c37672008-12-23 16:30:12 -0500633EXPORT_SYMBOL_GPL(svc_prepare_thread);
Jeff Layton0113ab32008-01-29 10:30:54 -0500634
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635/*
Greg Banksa7455442006-10-02 02:17:59 -0700636 * Choose a pool in which to create a new thread, for svc_set_num_threads
637 */
638static inline struct svc_pool *
639choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
640{
641 if (pool != NULL)
642 return pool;
643
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800644 return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
Greg Banksa7455442006-10-02 02:17:59 -0700645}
646
647/*
648 * Choose a thread to kill, for svc_set_num_threads
649 */
650static inline struct task_struct *
651choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
652{
653 unsigned int i;
654 struct task_struct *task = NULL;
655
656 if (pool != NULL) {
657 spin_lock_bh(&pool->sp_lock);
658 } else {
659 /* choose a pool in round-robin fashion */
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800660 for (i = 0; i < serv->sv_nrpools; i++) {
661 pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
Greg Banksa7455442006-10-02 02:17:59 -0700662 spin_lock_bh(&pool->sp_lock);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800663 if (!list_empty(&pool->sp_all_threads))
664 goto found_pool;
Greg Banksa7455442006-10-02 02:17:59 -0700665 spin_unlock_bh(&pool->sp_lock);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800666 }
Greg Banksa7455442006-10-02 02:17:59 -0700667 return NULL;
668 }
669
670found_pool:
671 if (!list_empty(&pool->sp_all_threads)) {
672 struct svc_rqst *rqstp;
673
674 /*
675 * Remove from the pool->sp_all_threads list
676 * so we don't try to kill it again.
677 */
678 rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all);
679 list_del_init(&rqstp->rq_all);
680 task = rqstp->rq_task;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800681 }
Greg Banksa7455442006-10-02 02:17:59 -0700682 spin_unlock_bh(&pool->sp_lock);
683
684 return task;
685}
686
687/*
688 * Create or destroy enough new threads to make the number
689 * of threads the given number. If `pool' is non-NULL, applies
690 * only to threads in that pool, otherwise round-robins between
J. Bruce Fields94cf3172011-12-01 17:51:21 -0500691 * all pools. Caller must ensure that mutual exclusion between this and
692 * server startup or shutdown.
Greg Banksa7455442006-10-02 02:17:59 -0700693 *
694 * Destroying threads relies on the service threads filling in
695 * rqstp->rq_task, which only the nfs ones do. Assumes the serv
696 * has been created using svc_create_pooled().
697 *
698 * Based on code that used to be in nfsd_svc() but tweaked
699 * to be pool-aware.
700 */
701int
702svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
703{
Jeff Layton9867d762008-06-10 08:40:38 -0400704 struct svc_rqst *rqstp;
705 struct task_struct *task;
706 struct svc_pool *chosen_pool;
Greg Banksa7455442006-10-02 02:17:59 -0700707 int error = 0;
708 unsigned int state = serv->sv_nrthreads-1;
Eric Dumazet11fd1652011-07-28 20:04:09 +0200709 int node;
Greg Banksa7455442006-10-02 02:17:59 -0700710
711 if (pool == NULL) {
712 /* The -1 assumes caller has done a svc_get() */
713 nrservs -= (serv->sv_nrthreads-1);
714 } else {
715 spin_lock_bh(&pool->sp_lock);
716 nrservs -= pool->sp_nrthreads;
717 spin_unlock_bh(&pool->sp_lock);
718 }
719
720 /* create new threads */
721 while (nrservs > 0) {
722 nrservs--;
Jeff Layton9867d762008-06-10 08:40:38 -0400723 chosen_pool = choose_pool(serv, pool, &state);
724
Eric Dumazet11fd1652011-07-28 20:04:09 +0200725 node = svc_pool_map_get_node(chosen_pool->sp_id);
726 rqstp = svc_prepare_thread(serv, chosen_pool, node);
Jeff Layton9867d762008-06-10 08:40:38 -0400727 if (IS_ERR(rqstp)) {
728 error = PTR_ERR(rqstp);
Greg Banksa7455442006-10-02 02:17:59 -0700729 break;
730 }
Jeff Layton9867d762008-06-10 08:40:38 -0400731
732 __module_get(serv->sv_module);
Eric Dumazet11fd1652011-07-28 20:04:09 +0200733 task = kthread_create_on_node(serv->sv_function, rqstp,
734 node, serv->sv_name);
Jeff Layton9867d762008-06-10 08:40:38 -0400735 if (IS_ERR(task)) {
736 error = PTR_ERR(task);
737 module_put(serv->sv_module);
738 svc_exit_thread(rqstp);
739 break;
740 }
741
742 rqstp->rq_task = task;
743 if (serv->sv_nrpools > 1)
744 svc_pool_map_set_cpumask(task, chosen_pool->sp_id);
745
746 svc_sock_update_bufs(serv);
747 wake_up_process(task);
Greg Banksa7455442006-10-02 02:17:59 -0700748 }
749 /* destroy old threads */
750 while (nrservs < 0 &&
Jeff Layton9867d762008-06-10 08:40:38 -0400751 (task = choose_victim(serv, pool, &state)) != NULL) {
Jeff Laytona75c5d02008-06-10 08:40:39 -0400752 send_sig(SIGINT, task, 1);
Greg Banksa7455442006-10-02 02:17:59 -0700753 nrservs++;
754 }
755
756 return error;
757}
Trond Myklebust24c37672008-12-23 16:30:12 -0500758EXPORT_SYMBOL_GPL(svc_set_num_threads);
Greg Banksa7455442006-10-02 02:17:59 -0700759
760/*
Neil Brownbedbdd82008-06-10 08:40:35 -0400761 * Called from a server thread as it's exiting. Caller must hold the BKL or
762 * the "service mutex", whichever is appropriate for the service.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 */
764void
765svc_exit_thread(struct svc_rqst *rqstp)
766{
767 struct svc_serv *serv = rqstp->rq_server;
Greg Banks3262c812006-10-02 02:17:58 -0700768 struct svc_pool *pool = rqstp->rq_pool;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
770 svc_release_buffer(rqstp);
Jesper Juhla51482b2005-11-08 09:41:34 -0800771 kfree(rqstp->rq_resp);
772 kfree(rqstp->rq_argp);
773 kfree(rqstp->rq_auth_data);
Greg Banks3262c812006-10-02 02:17:58 -0700774
775 spin_lock_bh(&pool->sp_lock);
776 pool->sp_nrthreads--;
Greg Banksa7455442006-10-02 02:17:59 -0700777 list_del(&rqstp->rq_all);
Greg Banks3262c812006-10-02 02:17:58 -0700778 spin_unlock_bh(&pool->sp_lock);
779
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 kfree(rqstp);
781
782 /* Release the server */
783 if (serv)
784 svc_destroy(serv);
785}
Trond Myklebust24c37672008-12-23 16:30:12 -0500786EXPORT_SYMBOL_GPL(svc_exit_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
788/*
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500789 * Register an "inet" protocol family netid with the local
790 * rpcbind daemon via an rpcbind v4 SET request.
Chuck Levera26cfad2008-08-18 19:34:16 -0400791 *
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500792 * No netconfig infrastructure is available in the kernel, so
793 * we map IP_ protocol numbers to netids by hand.
Chuck Levera26cfad2008-08-18 19:34:16 -0400794 *
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500795 * Returns zero on success; a negative errno value is returned
796 * if any error occurs.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400798static int __svc_rpcb_register4(struct net *net, const u32 program,
799 const u32 version,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500800 const unsigned short protocol,
801 const unsigned short port)
Chuck Levera26cfad2008-08-18 19:34:16 -0400802{
Chuck Levercadc0fa2009-03-18 20:47:36 -0400803 const struct sockaddr_in sin = {
Chuck Levera26cfad2008-08-18 19:34:16 -0400804 .sin_family = AF_INET,
805 .sin_addr.s_addr = htonl(INADDR_ANY),
806 .sin_port = htons(port),
807 };
Chuck Levercadc0fa2009-03-18 20:47:36 -0400808 const char *netid;
809 int error;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500810
811 switch (protocol) {
812 case IPPROTO_UDP:
813 netid = RPCBIND_NETID_UDP;
814 break;
815 case IPPROTO_TCP:
816 netid = RPCBIND_NETID_TCP;
817 break;
818 default:
Chuck Leverba5c35e2009-03-18 20:46:59 -0400819 return -ENOPROTOOPT;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500820 }
821
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400822 error = rpcb_v4_register(net, program, version,
Chuck Levercadc0fa2009-03-18 20:47:36 -0400823 (const struct sockaddr *)&sin, netid);
824
825 /*
826 * User space didn't support rpcbind v4, so retry this
827 * registration request with the legacy rpcbind v2 protocol.
828 */
829 if (error == -EPROTONOSUPPORT)
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400830 error = rpcb_register(net, program, version, protocol, port);
Chuck Levercadc0fa2009-03-18 20:47:36 -0400831
832 return error;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500833}
834
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000835#if IS_ENABLED(CONFIG_IPV6)
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500836/*
837 * Register an "inet6" protocol family netid with the local
838 * rpcbind daemon via an rpcbind v4 SET request.
839 *
840 * No netconfig infrastructure is available in the kernel, so
841 * we map IP_ protocol numbers to netids by hand.
842 *
843 * Returns zero on success; a negative errno value is returned
844 * if any error occurs.
845 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400846static int __svc_rpcb_register6(struct net *net, const u32 program,
847 const u32 version,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500848 const unsigned short protocol,
849 const unsigned short port)
850{
Chuck Levercadc0fa2009-03-18 20:47:36 -0400851 const struct sockaddr_in6 sin6 = {
Chuck Levera26cfad2008-08-18 19:34:16 -0400852 .sin6_family = AF_INET6,
853 .sin6_addr = IN6ADDR_ANY_INIT,
854 .sin6_port = htons(port),
855 };
Chuck Levercadc0fa2009-03-18 20:47:36 -0400856 const char *netid;
857 int error;
Chuck Levera26cfad2008-08-18 19:34:16 -0400858
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500859 switch (protocol) {
860 case IPPROTO_UDP:
861 netid = RPCBIND_NETID_UDP6;
862 break;
863 case IPPROTO_TCP:
864 netid = RPCBIND_NETID_TCP6;
865 break;
866 default:
Chuck Leverba5c35e2009-03-18 20:46:59 -0400867 return -ENOPROTOOPT;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500868 }
869
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400870 error = rpcb_v4_register(net, program, version,
Chuck Levercadc0fa2009-03-18 20:47:36 -0400871 (const struct sockaddr *)&sin6, netid);
872
873 /*
874 * User space didn't support rpcbind version 4, so we won't
875 * use a PF_INET6 listener.
876 */
877 if (error == -EPROTONOSUPPORT)
878 error = -EAFNOSUPPORT;
879
880 return error;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500881}
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000882#endif /* IS_ENABLED(CONFIG_IPV6) */
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500883
884/*
885 * Register a kernel RPC service via rpcbind version 4.
886 *
887 * Returns zero on success; a negative errno value is returned
888 * if any error occurs.
889 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400890static int __svc_register(struct net *net, const char *progname,
Chuck Lever363f7242009-03-18 20:47:44 -0400891 const u32 program, const u32 version,
Chuck Lever4b62e582009-03-18 20:46:06 -0400892 const int family,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500893 const unsigned short protocol,
894 const unsigned short port)
895{
Chuck Lever363f7242009-03-18 20:47:44 -0400896 int error = -EAFNOSUPPORT;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500897
Chuck Levera26cfad2008-08-18 19:34:16 -0400898 switch (family) {
Chuck Lever4b62e582009-03-18 20:46:06 -0400899 case PF_INET:
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400900 error = __svc_rpcb_register4(net, program, version,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500901 protocol, port);
Chuck Levercadc0fa2009-03-18 20:47:36 -0400902 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000903#if IS_ENABLED(CONFIG_IPV6)
Chuck Lever4b62e582009-03-18 20:46:06 -0400904 case PF_INET6:
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400905 error = __svc_rpcb_register6(net, program, version,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500906 protocol, port);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000907#endif
Chuck Levera26cfad2008-08-18 19:34:16 -0400908 }
909
Chuck Lever363f7242009-03-18 20:47:44 -0400910 if (error < 0)
911 printk(KERN_WARNING "svc: failed to register %sv%u RPC "
912 "service (errno %d).\n", progname, version, -error);
913 return error;
Chuck Levera26cfad2008-08-18 19:34:16 -0400914}
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500915
Chuck Levera26cfad2008-08-18 19:34:16 -0400916/**
917 * svc_register - register an RPC service with the local portmapper
918 * @serv: svc_serv struct for the service to register
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400919 * @net: net namespace for the service to register
Chuck Lever4b62e582009-03-18 20:46:06 -0400920 * @family: protocol family of service's listener socket
Chuck Levera26cfad2008-08-18 19:34:16 -0400921 * @proto: transport protocol number to advertise
922 * @port: port to advertise
923 *
Chuck Lever4b62e582009-03-18 20:46:06 -0400924 * Service is registered for any address in the passed-in protocol family
Chuck Levera26cfad2008-08-18 19:34:16 -0400925 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400926int svc_register(const struct svc_serv *serv, struct net *net,
927 const int family, const unsigned short proto,
928 const unsigned short port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929{
930 struct svc_program *progp;
Chuck Leverea339d42007-10-26 13:32:56 -0400931 unsigned int i;
Chuck Lever14aeb212008-08-18 19:34:00 -0400932 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
Chuck Lever7252d572008-08-18 19:34:08 -0400934 BUG_ON(proto == 0 && port == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700936 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
937 for (i = 0; i < progp->pg_nvers; i++) {
938 if (progp->pg_vers[i] == NULL)
939 continue;
940
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500941 dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n",
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700942 progp->pg_name,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500943 i,
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700944 proto == IPPROTO_UDP? "udp" : "tcp",
945 port,
Chuck Lever4b62e582009-03-18 20:46:06 -0400946 family,
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700947 progp->pg_vers[i]->vs_hidden?
948 " (but not telling portmap)" : "");
949
950 if (progp->pg_vers[i]->vs_hidden)
951 continue;
952
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400953 error = __svc_register(net, progp->pg_name, progp->pg_prog,
Chuck Lever363f7242009-03-18 20:47:44 -0400954 i, family, proto, port);
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700955 if (error < 0)
956 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 }
958 }
959
Chuck Lever7252d572008-08-18 19:34:08 -0400960 return error;
961}
962
Chuck Leverd5a86202009-03-18 20:47:29 -0400963/*
964 * If user space is running rpcbind, it should take the v4 UNSET
965 * and clear everything for this [program, version]. If user space
966 * is running portmap, it will reject the v4 UNSET, but won't have
967 * any "inet6" entries anyway. So a PMAP_UNSET should be sufficient
968 * in this case to clear all existing entries for [program, version].
969 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400970static void __svc_unregister(struct net *net, const u32 program, const u32 version,
Chuck Leverf6fb3f62008-09-25 11:56:57 -0400971 const char *progname)
972{
973 int error;
974
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400975 error = rpcb_v4_register(net, program, version, NULL, "");
Chuck Leverd5a86202009-03-18 20:47:29 -0400976
977 /*
978 * User space didn't support rpcbind v4, so retry this
979 * request with the legacy rpcbind v2 protocol.
980 */
981 if (error == -EPROTONOSUPPORT)
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400982 error = rpcb_register(net, program, version, 0, 0);
Chuck Leverd5a86202009-03-18 20:47:29 -0400983
Chuck Leverf6fb3f62008-09-25 11:56:57 -0400984 dprintk("svc: %s(%sv%u), error %d\n",
985 __func__, progname, version, error);
986}
987
Chuck Lever7252d572008-08-18 19:34:08 -0400988/*
Chuck Leverf6fb3f62008-09-25 11:56:57 -0400989 * All netids, bind addresses and ports registered for [program, version]
990 * are removed from the local rpcbind database (if the service is not
991 * hidden) to make way for a new instance of the service.
Chuck Lever7252d572008-08-18 19:34:08 -0400992 *
Chuck Leverf6fb3f62008-09-25 11:56:57 -0400993 * The result of unregistration is reported via dprintk for those who want
994 * verification of the result, but is otherwise not important.
Chuck Lever7252d572008-08-18 19:34:08 -0400995 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400996static void svc_unregister(const struct svc_serv *serv, struct net *net)
Chuck Lever7252d572008-08-18 19:34:08 -0400997{
998 struct svc_program *progp;
999 unsigned long flags;
1000 unsigned int i;
Chuck Lever7252d572008-08-18 19:34:08 -04001001
1002 clear_thread_flag(TIF_SIGPENDING);
1003
1004 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
1005 for (i = 0; i < progp->pg_nvers; i++) {
1006 if (progp->pg_vers[i] == NULL)
1007 continue;
1008 if (progp->pg_vers[i]->vs_hidden)
1009 continue;
1010
Chuck Lever7402ab12011-05-09 15:22:55 -04001011 dprintk("svc: attempting to unregister %sv%u\n",
1012 progp->pg_name, i);
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +04001013 __svc_unregister(net, progp->pg_prog, i, progp->pg_name);
Chuck Lever7252d572008-08-18 19:34:08 -04001014 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 }
1016
Chuck Lever7252d572008-08-18 19:34:08 -04001017 spin_lock_irqsave(&current->sighand->siglock, flags);
1018 recalc_sigpending();
1019 spin_unlock_irqrestore(&current->sighand->siglock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020}
1021
1022/*
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001023 * Printk the given error with the address of the client that caused it.
1024 */
Joe Perchesb9075fa2011-10-31 17:11:33 -07001025static __printf(2, 3)
1026int svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001027{
1028 va_list args;
1029 int r;
1030 char buf[RPC_MAX_ADDRBUFLEN];
1031
1032 if (!net_ratelimit())
1033 return 0;
1034
1035 printk(KERN_WARNING "svc: %s: ",
1036 svc_print_addr(rqstp, buf, sizeof(buf)));
1037
1038 va_start(args, fmt);
1039 r = vprintk(fmt, args);
1040 va_end(args);
1041
1042 return r;
1043}
1044
1045/*
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001046 * Common routine for processing the RPC request.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 */
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001048static int
1049svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050{
1051 struct svc_program *progp;
1052 struct svc_version *versp = NULL; /* compiler food */
1053 struct svc_procedure *procp = NULL;
NeilBrown6fb2b472006-10-02 02:17:50 -07001054 struct svc_serv *serv = rqstp->rq_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 kxdrproc_t xdr;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001056 __be32 *statp;
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001057 u32 prog, vers, proc;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001058 __be32 auth_stat, rpc_stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 int auth_res;
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -07001060 __be32 *reply_statp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061
1062 rpc_stat = rpc_success;
1063
1064 if (argv->iov_len < 6*4)
1065 goto err_short_len;
1066
J. Bruce Fields5c04c462006-06-30 01:56:19 -07001067 /* Will be turned off only in gss privacy case: */
Jens Axboecf8208d2007-06-12 21:22:14 +02001068 rqstp->rq_splice_ok = 1;
Andy Adamson2f425872009-04-03 08:27:32 +03001069 /* Will be turned off only when NFSv4 Sessions are used */
1070 rqstp->rq_usedeferral = 1;
J. Bruce Fields9e701c62011-01-02 21:56:36 -05001071 rqstp->rq_dropme = false;
Tom Tuckere831fe62007-12-30 21:07:29 -06001072
1073 /* Setup reply header */
1074 rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 svc_putu32(resv, rqstp->rq_xid);
1077
Alexey Dobriyan76994312006-09-26 22:28:46 -07001078 vers = svc_getnl(argv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079
1080 /* First words of reply: */
Alexey Dobriyan76994312006-09-26 22:28:46 -07001081 svc_putnl(resv, 1); /* REPLY */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 if (vers != 2) /* RPC version number */
1084 goto err_bad_rpc;
1085
1086 /* Save position in case we later decide to reject: */
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -07001087 reply_statp = resv->iov_base + resv->iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
Alexey Dobriyan76994312006-09-26 22:28:46 -07001089 svc_putnl(resv, 0); /* ACCEPT */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090
Alexey Dobriyan76994312006-09-26 22:28:46 -07001091 rqstp->rq_prog = prog = svc_getnl(argv); /* program number */
1092 rqstp->rq_vers = vers = svc_getnl(argv); /* version number */
1093 rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094
1095 progp = serv->sv_program;
NeilBrown80d188a2005-11-07 01:00:27 -08001096
1097 for (progp = serv->sv_program; progp; progp = progp->pg_next)
1098 if (prog == progp->pg_prog)
1099 break;
1100
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 /*
1102 * Decode auth data, and add verifier to reply buffer.
1103 * We do this before anything else in order to get a decent
1104 * auth verifier.
1105 */
1106 auth_res = svc_authenticate(rqstp, &auth_stat);
1107 /* Also give the program a chance to reject this call: */
NeilBrown80d188a2005-11-07 01:00:27 -08001108 if (auth_res == SVC_OK && progp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 auth_stat = rpc_autherr_badcred;
1110 auth_res = progp->pg_authenticate(rqstp);
1111 }
1112 switch (auth_res) {
1113 case SVC_OK:
1114 break;
1115 case SVC_GARBAGE:
Harshula Jayasuriyadd352102008-02-20 10:56:56 +11001116 goto err_garbage;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 case SVC_SYSERR:
1118 rpc_stat = rpc_system_err;
1119 goto err_bad;
1120 case SVC_DENIED:
1121 goto err_bad_auth;
NeilBrown1ebede82010-08-12 17:04:07 +10001122 case SVC_CLOSE:
1123 if (test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags))
1124 svc_close_xprt(rqstp->rq_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 case SVC_DROP:
1126 goto dropit;
1127 case SVC_COMPLETE:
1128 goto sendit;
1129 }
NeilBrown80d188a2005-11-07 01:00:27 -08001130
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +00001131 if (progp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 goto err_bad_prog;
1133
1134 if (vers >= progp->pg_nvers ||
1135 !(versp = progp->pg_vers[vers]))
1136 goto err_bad_vers;
1137
1138 procp = versp->vs_proc + proc;
1139 if (proc >= versp->vs_nproc || !procp->pc_func)
1140 goto err_bad_proc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 rqstp->rq_procinfo = procp;
1142
1143 /* Syntactic check complete */
1144 serv->sv_stats->rpccnt++;
1145
1146 /* Build the reply header. */
1147 statp = resv->iov_base +resv->iov_len;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001148 svc_putnl(resv, RPC_SUCCESS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149
1150 /* Bump per-procedure stats counter */
1151 procp->pc_count++;
1152
1153 /* Initialize storage for argp and resp */
1154 memset(rqstp->rq_argp, 0, procp->pc_argsize);
1155 memset(rqstp->rq_resp, 0, procp->pc_ressize);
1156
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001157 /* un-reserve some of the out-queue now that we have a
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 * better idea of reply size
1159 */
1160 if (procp->pc_xdrressize)
Jeff Laytoncd123012007-05-09 02:34:50 -07001161 svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
1163 /* Call the function that processes the request. */
1164 if (!versp->vs_dispatch) {
1165 /* Decode arguments */
1166 xdr = procp->pc_decode;
1167 if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
1168 goto err_garbage;
1169
1170 *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
1171
1172 /* Encode reply */
J. Bruce Fields9e701c62011-01-02 21:56:36 -05001173 if (rqstp->rq_dropme) {
NeilBrownd343fce2006-10-17 00:10:18 -07001174 if (procp->pc_release)
1175 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1176 goto dropit;
1177 }
Joe Perchesf64f9e72009-11-29 16:55:45 -08001178 if (*statp == rpc_success &&
1179 (xdr = procp->pc_encode) &&
1180 !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 dprintk("svc: failed to encode reply\n");
1182 /* serv->sv_stats->rpcsystemerr++; */
1183 *statp = rpc_system_err;
1184 }
1185 } else {
1186 dprintk("svc: calling dispatcher\n");
1187 if (!versp->vs_dispatch(rqstp, statp)) {
1188 /* Release reply info */
1189 if (procp->pc_release)
1190 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1191 goto dropit;
1192 }
1193 }
1194
1195 /* Check RPC status result */
1196 if (*statp != rpc_success)
1197 resv->iov_len = ((void*)statp) - resv->iov_base + 4;
1198
1199 /* Release reply info */
1200 if (procp->pc_release)
1201 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1202
1203 if (procp->pc_encode == NULL)
1204 goto dropit;
1205
1206 sendit:
1207 if (svc_authorise(rqstp))
1208 goto dropit;
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001209 return 1; /* Caller can now send it */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210
1211 dropit:
1212 svc_authorise(rqstp); /* doesn't hurt to call this twice */
1213 dprintk("svc: svc_process dropit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 return 0;
1215
1216err_short_len:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001217 svc_printk(rqstp, "short len %Zd, dropping request\n",
1218 argv->iov_len);
NeilBrown34e9a632007-01-29 13:19:52 -08001219
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 goto dropit; /* drop request */
1221
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222err_bad_rpc:
1223 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001224 svc_putnl(resv, 1); /* REJECT */
1225 svc_putnl(resv, 0); /* RPC_MISMATCH */
1226 svc_putnl(resv, 2); /* Only RPCv2 supported */
1227 svc_putnl(resv, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 goto sendit;
1229
1230err_bad_auth:
1231 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
1232 serv->sv_stats->rpcbadauth++;
1233 /* Restore write pointer to location of accept status: */
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -07001234 xdr_ressize_check(rqstp, reply_statp);
Alexey Dobriyan76994312006-09-26 22:28:46 -07001235 svc_putnl(resv, 1); /* REJECT */
1236 svc_putnl(resv, 1); /* AUTH_ERROR */
1237 svc_putnl(resv, ntohl(auth_stat)); /* status */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 goto sendit;
1239
1240err_bad_prog:
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +00001241 dprintk("svc: unknown program %d\n", prog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001243 svc_putnl(resv, RPC_PROG_UNAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 goto sendit;
1245
1246err_bad_vers:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001247 svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
NeilBrown34e9a632007-01-29 13:19:52 -08001248 vers, prog, progp->pg_name);
1249
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001251 svc_putnl(resv, RPC_PROG_MISMATCH);
1252 svc_putnl(resv, progp->pg_lovers);
1253 svc_putnl(resv, progp->pg_hivers);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 goto sendit;
1255
1256err_bad_proc:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001257 svc_printk(rqstp, "unknown procedure (%d)\n", proc);
NeilBrown34e9a632007-01-29 13:19:52 -08001258
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001260 svc_putnl(resv, RPC_PROC_UNAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 goto sendit;
1262
1263err_garbage:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001264 svc_printk(rqstp, "failed to decode args\n");
NeilBrown34e9a632007-01-29 13:19:52 -08001265
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 rpc_stat = rpc_garbage_args;
1267err_bad:
1268 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001269 svc_putnl(resv, ntohl(rpc_stat));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 goto sendit;
1271}
Trond Myklebust24c37672008-12-23 16:30:12 -05001272EXPORT_SYMBOL_GPL(svc_process);
Greg Banks7adae482006-10-04 02:15:47 -07001273
1274/*
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001275 * Process the RPC request.
1276 */
1277int
1278svc_process(struct svc_rqst *rqstp)
1279{
1280 struct kvec *argv = &rqstp->rq_arg.head[0];
1281 struct kvec *resv = &rqstp->rq_res.head[0];
1282 struct svc_serv *serv = rqstp->rq_server;
1283 u32 dir;
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001284
1285 /*
1286 * Setup response xdr_buf.
1287 * Initially it has just one page
1288 */
1289 rqstp->rq_resused = 1;
1290 resv->iov_base = page_address(rqstp->rq_respages[0]);
1291 resv->iov_len = 0;
1292 rqstp->rq_res.pages = rqstp->rq_respages + 1;
1293 rqstp->rq_res.len = 0;
1294 rqstp->rq_res.page_base = 0;
1295 rqstp->rq_res.page_len = 0;
1296 rqstp->rq_res.buflen = PAGE_SIZE;
1297 rqstp->rq_res.tail[0].iov_base = NULL;
1298 rqstp->rq_res.tail[0].iov_len = 0;
1299
1300 rqstp->rq_xid = svc_getu32(argv);
1301
1302 dir = svc_getnl(argv);
1303 if (dir != 0) {
1304 /* direction != CALL */
1305 svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
1306 serv->sv_stats->rpcbadfmt++;
1307 svc_drop(rqstp);
1308 return 0;
1309 }
1310
Andy Adamson4b5b3ba2011-01-06 02:04:24 +00001311 /* Returns 1 for send, 0 for drop */
1312 if (svc_process_common(rqstp, argv, resv))
1313 return svc_send(rqstp);
1314 else {
1315 svc_drop(rqstp);
1316 return 0;
1317 }
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001318}
1319
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001320#if defined(CONFIG_SUNRPC_BACKCHANNEL)
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001321/*
1322 * Process a backchannel RPC request that arrived over an existing
1323 * outbound connection
1324 */
1325int
1326bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req,
1327 struct svc_rqst *rqstp)
1328{
1329 struct kvec *argv = &rqstp->rq_arg.head[0];
1330 struct kvec *resv = &rqstp->rq_res.head[0];
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001331
1332 /* Build the svc_rqst used by the common processing routine */
Andy Adamson4a19de02011-01-06 02:04:35 +00001333 rqstp->rq_xprt = serv->sv_bc_xprt;
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001334 rqstp->rq_xid = req->rq_xid;
1335 rqstp->rq_prot = req->rq_xprt->prot;
1336 rqstp->rq_server = serv;
1337
1338 rqstp->rq_addrlen = sizeof(req->rq_xprt->addr);
1339 memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen);
1340 memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg));
1341 memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res));
1342
1343 /* reset result send buffer "put" position */
1344 resv->iov_len = 0;
1345
1346 if (rqstp->rq_prot != IPPROTO_TCP) {
1347 printk(KERN_ERR "No support for Non-TCP transports!\n");
1348 BUG();
1349 }
1350
1351 /*
1352 * Skip the next two words because they've already been
1353 * processed in the trasport
1354 */
1355 svc_getu32(argv); /* XID */
1356 svc_getnl(argv); /* CALLDIR */
1357
Andy Adamson4b5b3ba2011-01-06 02:04:24 +00001358 /* Returns 1 for send, 0 for drop */
1359 if (svc_process_common(rqstp, argv, resv)) {
1360 memcpy(&req->rq_snd_buf, &rqstp->rq_res,
1361 sizeof(req->rq_snd_buf));
1362 return bc_send(req);
1363 } else {
1364 /* Nothing to do to drop request */
1365 return 0;
1366 }
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001367}
Trond Myklebust0d961aa2011-07-13 19:24:15 -04001368EXPORT_SYMBOL_GPL(bc_svc_process);
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001369#endif /* CONFIG_SUNRPC_BACKCHANNEL */
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001370
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001371/*
Greg Banks7adae482006-10-04 02:15:47 -07001372 * Return (transport-specific) limit on the rpc payload.
1373 */
1374u32 svc_max_payload(const struct svc_rqst *rqstp)
1375{
Tom Tucker49023152007-12-30 21:07:21 -06001376 u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
Greg Banks7adae482006-10-04 02:15:47 -07001377
NeilBrownc6b0a9f2006-10-06 00:44:05 -07001378 if (rqstp->rq_server->sv_max_payload < max)
1379 max = rqstp->rq_server->sv_max_payload;
Greg Banks7adae482006-10-04 02:15:47 -07001380 return max;
1381}
1382EXPORT_SYMBOL_GPL(svc_max_payload);