blob: 17e0d7265dfdf912d389af412e2a772e0a788640 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23#include <linux/sunrpc/types.h>
24#include <linux/sunrpc/xdr.h>
25#include <linux/sunrpc/stats.h>
26#include <linux/sunrpc/svcsock.h>
27#include <linux/sunrpc/clnt.h>
28
29#define RPCDBG_FACILITY RPCDBG_SVCDSP
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Chuck Lever7252d572008-08-18 19:34:08 -040031static void svc_unregister(const struct svc_serv *serv);
32
Greg Banks42a7fc42007-03-06 01:42:23 -080033#define svc_serv_is_pooled(serv) ((serv)->sv_function)
34
Linus Torvalds1da177e2005-04-16 15:20:36 -070035/*
Greg Banksbfd24162006-10-02 02:18:01 -070036 * Mode for mapping cpus to pools.
37 */
38enum {
Greg Banks42a7fc42007-03-06 01:42:23 -080039 SVC_POOL_AUTO = -1, /* choose one of the others */
Greg Banksbfd24162006-10-02 02:18:01 -070040 SVC_POOL_GLOBAL, /* no mapping, just a single global pool
41 * (legacy & UP mode) */
42 SVC_POOL_PERCPU, /* one pool per cpu */
43 SVC_POOL_PERNODE /* one pool per numa node */
44};
Greg Banks42a7fc42007-03-06 01:42:23 -080045#define SVC_POOL_DEFAULT SVC_POOL_GLOBAL
Greg Banksbfd24162006-10-02 02:18:01 -070046
47/*
48 * Structure for mapping cpus to pools and vice versa.
49 * Setup once during sunrpc initialisation.
50 */
51static struct svc_pool_map {
Greg Banks42a7fc42007-03-06 01:42:23 -080052 int count; /* How many svc_servs use us */
Greg Banksbfd24162006-10-02 02:18:01 -070053 int mode; /* Note: int not enum to avoid
54 * warnings about "enumeration value
55 * not handled in switch" */
56 unsigned int npools;
57 unsigned int *pool_to; /* maps pool id to cpu or node */
58 unsigned int *to_pool; /* maps cpu or node to pool id */
59} svc_pool_map = {
Greg Banks42a7fc42007-03-06 01:42:23 -080060 .count = 0,
61 .mode = SVC_POOL_DEFAULT
Greg Banksbfd24162006-10-02 02:18:01 -070062};
Greg Banks42a7fc42007-03-06 01:42:23 -080063static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */
Greg Banksbfd24162006-10-02 02:18:01 -070064
Greg Banks42a7fc42007-03-06 01:42:23 -080065static int
66param_set_pool_mode(const char *val, struct kernel_param *kp)
67{
68 int *ip = (int *)kp->arg;
69 struct svc_pool_map *m = &svc_pool_map;
70 int err;
71
72 mutex_lock(&svc_pool_map_mutex);
73
74 err = -EBUSY;
75 if (m->count)
76 goto out;
77
78 err = 0;
79 if (!strncmp(val, "auto", 4))
80 *ip = SVC_POOL_AUTO;
81 else if (!strncmp(val, "global", 6))
82 *ip = SVC_POOL_GLOBAL;
83 else if (!strncmp(val, "percpu", 6))
84 *ip = SVC_POOL_PERCPU;
85 else if (!strncmp(val, "pernode", 7))
86 *ip = SVC_POOL_PERNODE;
87 else
88 err = -EINVAL;
89
90out:
91 mutex_unlock(&svc_pool_map_mutex);
92 return err;
93}
94
95static int
96param_get_pool_mode(char *buf, struct kernel_param *kp)
97{
98 int *ip = (int *)kp->arg;
99
100 switch (*ip)
101 {
102 case SVC_POOL_AUTO:
103 return strlcpy(buf, "auto", 20);
104 case SVC_POOL_GLOBAL:
105 return strlcpy(buf, "global", 20);
106 case SVC_POOL_PERCPU:
107 return strlcpy(buf, "percpu", 20);
108 case SVC_POOL_PERNODE:
109 return strlcpy(buf, "pernode", 20);
110 default:
111 return sprintf(buf, "%d", *ip);
112 }
113}
114
115module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode,
116 &svc_pool_map.mode, 0644);
Greg Banksbfd24162006-10-02 02:18:01 -0700117
118/*
119 * Detect best pool mapping mode heuristically,
120 * according to the machine's topology.
121 */
122static int
123svc_pool_map_choose_mode(void)
124{
125 unsigned int node;
126
127 if (num_online_nodes() > 1) {
128 /*
129 * Actually have multiple NUMA nodes,
130 * so split pools on NUMA node boundaries
131 */
132 return SVC_POOL_PERNODE;
133 }
134
135 node = any_online_node(node_online_map);
136 if (nr_cpus_node(node) > 2) {
137 /*
138 * Non-trivial SMP, or CONFIG_NUMA on
139 * non-NUMA hardware, e.g. with a generic
140 * x86_64 kernel on Xeons. In this case we
141 * want to divide the pools on cpu boundaries.
142 */
143 return SVC_POOL_PERCPU;
144 }
145
146 /* default: one global pool */
147 return SVC_POOL_GLOBAL;
148}
149
150/*
151 * Allocate the to_pool[] and pool_to[] arrays.
152 * Returns 0 on success or an errno.
153 */
154static int
155svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools)
156{
157 m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
158 if (!m->to_pool)
159 goto fail;
160 m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
161 if (!m->pool_to)
162 goto fail_free;
163
164 return 0;
165
166fail_free:
167 kfree(m->to_pool);
168fail:
169 return -ENOMEM;
170}
171
172/*
173 * Initialise the pool map for SVC_POOL_PERCPU mode.
174 * Returns number of pools or <0 on error.
175 */
176static int
177svc_pool_map_init_percpu(struct svc_pool_map *m)
178{
Christoph Lameter53b8a312007-02-20 13:57:51 -0800179 unsigned int maxpools = nr_cpu_ids;
Greg Banksbfd24162006-10-02 02:18:01 -0700180 unsigned int pidx = 0;
181 unsigned int cpu;
182 int err;
183
184 err = svc_pool_map_alloc_arrays(m, maxpools);
185 if (err)
186 return err;
187
188 for_each_online_cpu(cpu) {
189 BUG_ON(pidx > maxpools);
190 m->to_pool[cpu] = pidx;
191 m->pool_to[pidx] = cpu;
192 pidx++;
193 }
194 /* cpus brought online later all get mapped to pool0, sorry */
195
196 return pidx;
197};
198
199
200/*
201 * Initialise the pool map for SVC_POOL_PERNODE mode.
202 * Returns number of pools or <0 on error.
203 */
204static int
205svc_pool_map_init_pernode(struct svc_pool_map *m)
206{
Christoph Lameter74c7aa82007-02-20 13:57:51 -0800207 unsigned int maxpools = nr_node_ids;
Greg Banksbfd24162006-10-02 02:18:01 -0700208 unsigned int pidx = 0;
209 unsigned int node;
210 int err;
211
212 err = svc_pool_map_alloc_arrays(m, maxpools);
213 if (err)
214 return err;
215
216 for_each_node_with_cpus(node) {
217 /* some architectures (e.g. SN2) have cpuless nodes */
218 BUG_ON(pidx > maxpools);
219 m->to_pool[node] = pidx;
220 m->pool_to[pidx] = node;
221 pidx++;
222 }
223 /* nodes brought online later all get mapped to pool0, sorry */
224
225 return pidx;
226}
227
228
229/*
Greg Banks42a7fc42007-03-06 01:42:23 -0800230 * Add a reference to the global map of cpus to pools (and
231 * vice versa). Initialise the map if we're the first user.
232 * Returns the number of pools.
Greg Banksbfd24162006-10-02 02:18:01 -0700233 */
234static unsigned int
Greg Banks42a7fc42007-03-06 01:42:23 -0800235svc_pool_map_get(void)
Greg Banksbfd24162006-10-02 02:18:01 -0700236{
237 struct svc_pool_map *m = &svc_pool_map;
238 int npools = -1;
239
Greg Banks42a7fc42007-03-06 01:42:23 -0800240 mutex_lock(&svc_pool_map_mutex);
Greg Banksbfd24162006-10-02 02:18:01 -0700241
Greg Banks42a7fc42007-03-06 01:42:23 -0800242 if (m->count++) {
243 mutex_unlock(&svc_pool_map_mutex);
244 return m->npools;
245 }
246
247 if (m->mode == SVC_POOL_AUTO)
248 m->mode = svc_pool_map_choose_mode();
Greg Banksbfd24162006-10-02 02:18:01 -0700249
250 switch (m->mode) {
251 case SVC_POOL_PERCPU:
252 npools = svc_pool_map_init_percpu(m);
253 break;
254 case SVC_POOL_PERNODE:
255 npools = svc_pool_map_init_pernode(m);
256 break;
257 }
258
259 if (npools < 0) {
260 /* default, or memory allocation failure */
261 npools = 1;
262 m->mode = SVC_POOL_GLOBAL;
263 }
264 m->npools = npools;
265
Greg Banks42a7fc42007-03-06 01:42:23 -0800266 mutex_unlock(&svc_pool_map_mutex);
Greg Banksbfd24162006-10-02 02:18:01 -0700267 return m->npools;
268}
269
Greg Banks42a7fc42007-03-06 01:42:23 -0800270
271/*
272 * Drop a reference to the global map of cpus to pools.
273 * When the last reference is dropped, the map data is
274 * freed; this allows the sysadmin to change the pool
275 * mode using the pool_mode module option without
276 * rebooting or re-loading sunrpc.ko.
277 */
278static void
279svc_pool_map_put(void)
280{
281 struct svc_pool_map *m = &svc_pool_map;
282
283 mutex_lock(&svc_pool_map_mutex);
284
285 if (!--m->count) {
286 m->mode = SVC_POOL_DEFAULT;
287 kfree(m->to_pool);
288 kfree(m->pool_to);
289 m->npools = 0;
290 }
291
292 mutex_unlock(&svc_pool_map_mutex);
293}
294
295
Greg Banksbfd24162006-10-02 02:18:01 -0700296/*
Jeff Layton9867d762008-06-10 08:40:38 -0400297 * Set the given thread's cpus_allowed mask so that it
Greg Banksbfd24162006-10-02 02:18:01 -0700298 * will only run on cpus in the given pool.
Greg Banksbfd24162006-10-02 02:18:01 -0700299 */
Jeff Layton9867d762008-06-10 08:40:38 -0400300static inline void
301svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
Greg Banksbfd24162006-10-02 02:18:01 -0700302{
303 struct svc_pool_map *m = &svc_pool_map;
Jeff Layton9867d762008-06-10 08:40:38 -0400304 unsigned int node = m->pool_to[pidx];
Greg Banksbfd24162006-10-02 02:18:01 -0700305
306 /*
307 * The caller checks for sv_nrpools > 1, which
Greg Banks42a7fc42007-03-06 01:42:23 -0800308 * implies that we've been initialized.
Greg Banksbfd24162006-10-02 02:18:01 -0700309 */
Greg Banks42a7fc42007-03-06 01:42:23 -0800310 BUG_ON(m->count == 0);
Greg Banksbfd24162006-10-02 02:18:01 -0700311
Jeff Layton9867d762008-06-10 08:40:38 -0400312 switch (m->mode) {
Greg Banksbfd24162006-10-02 02:18:01 -0700313 case SVC_POOL_PERCPU:
Mike Travisc5f59f02008-04-04 18:11:10 -0700314 {
Mike Travis0bc3cc02008-07-24 18:21:31 -0700315 set_cpus_allowed_ptr(task, &cpumask_of_cpu(node));
Jeff Layton9867d762008-06-10 08:40:38 -0400316 break;
Mike Travisc5f59f02008-04-04 18:11:10 -0700317 }
Greg Banksbfd24162006-10-02 02:18:01 -0700318 case SVC_POOL_PERNODE:
Mike Travisc5f59f02008-04-04 18:11:10 -0700319 {
Mike Travisc5f59f02008-04-04 18:11:10 -0700320 node_to_cpumask_ptr(nodecpumask, node);
Jeff Layton9867d762008-06-10 08:40:38 -0400321 set_cpus_allowed_ptr(task, nodecpumask);
322 break;
Greg Banksbfd24162006-10-02 02:18:01 -0700323 }
Mike Travisc5f59f02008-04-04 18:11:10 -0700324 }
Greg Banksbfd24162006-10-02 02:18:01 -0700325}
326
327/*
328 * Use the mapping mode to choose a pool for a given CPU.
329 * Used when enqueueing an incoming RPC. Always returns
330 * a non-NULL pool pointer.
331 */
332struct svc_pool *
333svc_pool_for_cpu(struct svc_serv *serv, int cpu)
334{
335 struct svc_pool_map *m = &svc_pool_map;
336 unsigned int pidx = 0;
337
338 /*
Greg Banks42a7fc42007-03-06 01:42:23 -0800339 * An uninitialised map happens in a pure client when
Greg Banksbfd24162006-10-02 02:18:01 -0700340 * lockd is brought up, so silently treat it the
341 * same as SVC_POOL_GLOBAL.
342 */
Greg Banks42a7fc42007-03-06 01:42:23 -0800343 if (svc_serv_is_pooled(serv)) {
344 switch (m->mode) {
345 case SVC_POOL_PERCPU:
346 pidx = m->to_pool[cpu];
347 break;
348 case SVC_POOL_PERNODE:
349 pidx = m->to_pool[cpu_to_node(cpu)];
350 break;
351 }
Greg Banksbfd24162006-10-02 02:18:01 -0700352 }
353 return &serv->sv_pools[pidx % serv->sv_nrpools];
354}
355
356
357/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 * Create an RPC service
359 */
Greg Banksa7455442006-10-02 02:17:59 -0700360static struct svc_serv *
361__svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
Chuck Lever49a90722009-03-18 20:46:29 -0400362 void (*shutdown)(struct svc_serv *serv))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
364 struct svc_serv *serv;
Chuck Leverea339d42007-10-26 13:32:56 -0400365 unsigned int vers;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 unsigned int xdrsize;
Greg Banks3262c812006-10-02 02:17:58 -0700367 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700369 if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 return NULL;
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +0000371 serv->sv_name = prog->pg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 serv->sv_program = prog;
373 serv->sv_nrthreads = 1;
374 serv->sv_stats = prog->pg_stats;
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700375 if (bufsize > RPCSVC_MAXPAYLOAD)
376 bufsize = RPCSVC_MAXPAYLOAD;
377 serv->sv_max_payload = bufsize? bufsize : 4096;
378 serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE);
NeilBrownbc591cc2006-10-02 02:17:44 -0700379 serv->sv_shutdown = shutdown;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 xdrsize = 0;
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +0000381 while (prog) {
382 prog->pg_lovers = prog->pg_nvers-1;
383 for (vers=0; vers<prog->pg_nvers ; vers++)
384 if (prog->pg_vers[vers]) {
385 prog->pg_hivers = vers;
386 if (prog->pg_lovers > vers)
387 prog->pg_lovers = vers;
388 if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
389 xdrsize = prog->pg_vers[vers]->vs_xdrsize;
390 }
391 prog = prog->pg_next;
392 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 serv->sv_xdrsize = xdrsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 INIT_LIST_HEAD(&serv->sv_tempsocks);
395 INIT_LIST_HEAD(&serv->sv_permsocks);
Greg Banks36bdfc82006-10-02 02:17:54 -0700396 init_timer(&serv->sv_temptimer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 spin_lock_init(&serv->sv_lock);
398
Greg Banksa7455442006-10-02 02:17:59 -0700399 serv->sv_nrpools = npools;
Greg Banks3262c812006-10-02 02:17:58 -0700400 serv->sv_pools =
Robert P. J. Daycd861282006-12-13 00:34:52 -0800401 kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
Greg Banks3262c812006-10-02 02:17:58 -0700402 GFP_KERNEL);
403 if (!serv->sv_pools) {
404 kfree(serv);
405 return NULL;
406 }
407
408 for (i = 0; i < serv->sv_nrpools; i++) {
409 struct svc_pool *pool = &serv->sv_pools[i];
410
Chuck Lever46121cf2007-01-31 12:14:08 -0500411 dprintk("svc: initialising pool %u for %s\n",
Greg Banks3262c812006-10-02 02:17:58 -0700412 i, serv->sv_name);
413
414 pool->sp_id = i;
415 INIT_LIST_HEAD(&pool->sp_threads);
416 INIT_LIST_HEAD(&pool->sp_sockets);
Greg Banksa7455442006-10-02 02:17:59 -0700417 INIT_LIST_HEAD(&pool->sp_all_threads);
Greg Banks3262c812006-10-02 02:17:58 -0700418 spin_lock_init(&pool->sp_lock);
419 }
420
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 /* Remove any stale portmap registrations */
Chuck Lever7252d572008-08-18 19:34:08 -0400422 svc_unregister(serv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
424 return serv;
425}
426
Greg Banksa7455442006-10-02 02:17:59 -0700427struct svc_serv *
428svc_create(struct svc_program *prog, unsigned int bufsize,
Chuck Lever49a90722009-03-18 20:46:29 -0400429 void (*shutdown)(struct svc_serv *serv))
Greg Banksa7455442006-10-02 02:17:59 -0700430{
Chuck Lever49a90722009-03-18 20:46:29 -0400431 return __svc_create(prog, bufsize, /*npools*/1, shutdown);
Greg Banksa7455442006-10-02 02:17:59 -0700432}
Trond Myklebust24c37672008-12-23 16:30:12 -0500433EXPORT_SYMBOL_GPL(svc_create);
Greg Banksa7455442006-10-02 02:17:59 -0700434
435struct svc_serv *
436svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
Chuck Lever49a90722009-03-18 20:46:29 -0400437 void (*shutdown)(struct svc_serv *serv),
Jeff Laytona75c5d02008-06-10 08:40:39 -0400438 svc_thread_fn func, struct module *mod)
Greg Banksa7455442006-10-02 02:17:59 -0700439{
440 struct svc_serv *serv;
Greg Banks42a7fc42007-03-06 01:42:23 -0800441 unsigned int npools = svc_pool_map_get();
Greg Banksa7455442006-10-02 02:17:59 -0700442
Chuck Lever49a90722009-03-18 20:46:29 -0400443 serv = __svc_create(prog, bufsize, npools, shutdown);
Greg Banksa7455442006-10-02 02:17:59 -0700444
445 if (serv != NULL) {
446 serv->sv_function = func;
Greg Banksa7455442006-10-02 02:17:59 -0700447 serv->sv_module = mod;
448 }
449
450 return serv;
451}
Trond Myklebust24c37672008-12-23 16:30:12 -0500452EXPORT_SYMBOL_GPL(svc_create_pooled);
Greg Banksa7455442006-10-02 02:17:59 -0700453
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454/*
Neil Brownbedbdd82008-06-10 08:40:35 -0400455 * Destroy an RPC service. Should be called with appropriate locking to
456 * protect the sv_nrthreads, sv_permsocks and sv_tempsocks.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 */
458void
459svc_destroy(struct svc_serv *serv)
460{
Chuck Lever46121cf2007-01-31 12:14:08 -0500461 dprintk("svc: svc_destroy(%s, %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 serv->sv_program->pg_name,
463 serv->sv_nrthreads);
464
465 if (serv->sv_nrthreads) {
466 if (--(serv->sv_nrthreads) != 0) {
467 svc_sock_update_bufs(serv);
468 return;
469 }
470 } else
471 printk("svc_destroy: no threads for serv=%p!\n", serv);
472
Greg Banks36bdfc82006-10-02 02:17:54 -0700473 del_timer_sync(&serv->sv_temptimer);
474
Tom Tucker7a182082007-12-30 21:07:53 -0600475 svc_close_all(&serv->sv_tempsocks);
NeilBrowncda1fd42007-03-06 01:42:22 -0800476
NeilBrownbc591cc2006-10-02 02:17:44 -0700477 if (serv->sv_shutdown)
478 serv->sv_shutdown(serv);
479
Tom Tucker7a182082007-12-30 21:07:53 -0600480 svc_close_all(&serv->sv_permsocks);
NeilBrowncda1fd42007-03-06 01:42:22 -0800481
482 BUG_ON(!list_empty(&serv->sv_permsocks));
483 BUG_ON(!list_empty(&serv->sv_tempsocks));
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 cache_clean_deferred(serv);
486
Greg Banks42a7fc42007-03-06 01:42:23 -0800487 if (svc_serv_is_pooled(serv))
488 svc_pool_map_put();
489
Chuck Lever7252d572008-08-18 19:34:08 -0400490 svc_unregister(serv);
Greg Banks3262c812006-10-02 02:17:58 -0700491 kfree(serv->sv_pools);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 kfree(serv);
493}
Trond Myklebust24c37672008-12-23 16:30:12 -0500494EXPORT_SYMBOL_GPL(svc_destroy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
496/*
497 * Allocate an RPC server's buffer space.
498 * We allocate pages and place them in rq_argpages.
499 */
500static int
501svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
502{
Chuck Lever0dc220f2008-04-14 12:27:52 -0400503 unsigned int pages, arghi;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800504
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700505 pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
506 * We assume one is at most one page
507 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 arghi = 0;
Kris Katterjohn09a62662006-01-08 22:24:28 -0800509 BUG_ON(pages > RPCSVC_MAXPAGES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 while (pages) {
511 struct page *p = alloc_page(GFP_KERNEL);
512 if (!p)
513 break;
NeilBrown44524352006-10-04 02:15:46 -0700514 rqstp->rq_pages[arghi++] = p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 pages--;
516 }
Chuck Lever0dc220f2008-04-14 12:27:52 -0400517 return pages == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518}
519
520/*
521 * Release an RPC server buffer
522 */
523static void
524svc_release_buffer(struct svc_rqst *rqstp)
525{
Chuck Lever50c8bb12008-04-14 12:27:45 -0400526 unsigned int i;
527
528 for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++)
NeilBrown44524352006-10-04 02:15:46 -0700529 if (rqstp->rq_pages[i])
530 put_page(rqstp->rq_pages[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531}
532
Jeff Layton0113ab32008-01-29 10:30:54 -0500533struct svc_rqst *
534svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool)
535{
536 struct svc_rqst *rqstp;
537
538 rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL);
539 if (!rqstp)
540 goto out_enomem;
541
542 init_waitqueue_head(&rqstp->rq_wait);
543
544 serv->sv_nrthreads++;
545 spin_lock_bh(&pool->sp_lock);
546 pool->sp_nrthreads++;
547 list_add(&rqstp->rq_all, &pool->sp_all_threads);
548 spin_unlock_bh(&pool->sp_lock);
549 rqstp->rq_server = serv;
550 rqstp->rq_pool = pool;
551
552 rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
553 if (!rqstp->rq_argp)
554 goto out_thread;
555
556 rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
557 if (!rqstp->rq_resp)
558 goto out_thread;
559
560 if (!svc_init_buffer(rqstp, serv->sv_max_mesg))
561 goto out_thread;
562
563 return rqstp;
564out_thread:
565 svc_exit_thread(rqstp);
566out_enomem:
567 return ERR_PTR(-ENOMEM);
568}
Trond Myklebust24c37672008-12-23 16:30:12 -0500569EXPORT_SYMBOL_GPL(svc_prepare_thread);
Jeff Layton0113ab32008-01-29 10:30:54 -0500570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571/*
Greg Banksa7455442006-10-02 02:17:59 -0700572 * Choose a pool in which to create a new thread, for svc_set_num_threads
573 */
574static inline struct svc_pool *
575choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
576{
577 if (pool != NULL)
578 return pool;
579
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800580 return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
Greg Banksa7455442006-10-02 02:17:59 -0700581}
582
583/*
584 * Choose a thread to kill, for svc_set_num_threads
585 */
586static inline struct task_struct *
587choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
588{
589 unsigned int i;
590 struct task_struct *task = NULL;
591
592 if (pool != NULL) {
593 spin_lock_bh(&pool->sp_lock);
594 } else {
595 /* choose a pool in round-robin fashion */
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800596 for (i = 0; i < serv->sv_nrpools; i++) {
597 pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
Greg Banksa7455442006-10-02 02:17:59 -0700598 spin_lock_bh(&pool->sp_lock);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800599 if (!list_empty(&pool->sp_all_threads))
600 goto found_pool;
Greg Banksa7455442006-10-02 02:17:59 -0700601 spin_unlock_bh(&pool->sp_lock);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800602 }
Greg Banksa7455442006-10-02 02:17:59 -0700603 return NULL;
604 }
605
606found_pool:
607 if (!list_empty(&pool->sp_all_threads)) {
608 struct svc_rqst *rqstp;
609
610 /*
611 * Remove from the pool->sp_all_threads list
612 * so we don't try to kill it again.
613 */
614 rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all);
615 list_del_init(&rqstp->rq_all);
616 task = rqstp->rq_task;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800617 }
Greg Banksa7455442006-10-02 02:17:59 -0700618 spin_unlock_bh(&pool->sp_lock);
619
620 return task;
621}
622
623/*
624 * Create or destroy enough new threads to make the number
625 * of threads the given number. If `pool' is non-NULL, applies
626 * only to threads in that pool, otherwise round-robins between
627 * all pools. Must be called with a svc_get() reference and
Neil Brownbedbdd82008-06-10 08:40:35 -0400628 * the BKL or another lock to protect access to svc_serv fields.
Greg Banksa7455442006-10-02 02:17:59 -0700629 *
630 * Destroying threads relies on the service threads filling in
631 * rqstp->rq_task, which only the nfs ones do. Assumes the serv
632 * has been created using svc_create_pooled().
633 *
634 * Based on code that used to be in nfsd_svc() but tweaked
635 * to be pool-aware.
636 */
637int
638svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
639{
Jeff Layton9867d762008-06-10 08:40:38 -0400640 struct svc_rqst *rqstp;
641 struct task_struct *task;
642 struct svc_pool *chosen_pool;
Greg Banksa7455442006-10-02 02:17:59 -0700643 int error = 0;
644 unsigned int state = serv->sv_nrthreads-1;
645
646 if (pool == NULL) {
647 /* The -1 assumes caller has done a svc_get() */
648 nrservs -= (serv->sv_nrthreads-1);
649 } else {
650 spin_lock_bh(&pool->sp_lock);
651 nrservs -= pool->sp_nrthreads;
652 spin_unlock_bh(&pool->sp_lock);
653 }
654
655 /* create new threads */
656 while (nrservs > 0) {
657 nrservs--;
Jeff Layton9867d762008-06-10 08:40:38 -0400658 chosen_pool = choose_pool(serv, pool, &state);
659
660 rqstp = svc_prepare_thread(serv, chosen_pool);
661 if (IS_ERR(rqstp)) {
662 error = PTR_ERR(rqstp);
Greg Banksa7455442006-10-02 02:17:59 -0700663 break;
664 }
Jeff Layton9867d762008-06-10 08:40:38 -0400665
666 __module_get(serv->sv_module);
667 task = kthread_create(serv->sv_function, rqstp, serv->sv_name);
668 if (IS_ERR(task)) {
669 error = PTR_ERR(task);
670 module_put(serv->sv_module);
671 svc_exit_thread(rqstp);
672 break;
673 }
674
675 rqstp->rq_task = task;
676 if (serv->sv_nrpools > 1)
677 svc_pool_map_set_cpumask(task, chosen_pool->sp_id);
678
679 svc_sock_update_bufs(serv);
680 wake_up_process(task);
Greg Banksa7455442006-10-02 02:17:59 -0700681 }
682 /* destroy old threads */
683 while (nrservs < 0 &&
Jeff Layton9867d762008-06-10 08:40:38 -0400684 (task = choose_victim(serv, pool, &state)) != NULL) {
Jeff Laytona75c5d02008-06-10 08:40:39 -0400685 send_sig(SIGINT, task, 1);
Greg Banksa7455442006-10-02 02:17:59 -0700686 nrservs++;
687 }
688
689 return error;
690}
Trond Myklebust24c37672008-12-23 16:30:12 -0500691EXPORT_SYMBOL_GPL(svc_set_num_threads);
Greg Banksa7455442006-10-02 02:17:59 -0700692
693/*
Neil Brownbedbdd82008-06-10 08:40:35 -0400694 * Called from a server thread as it's exiting. Caller must hold the BKL or
695 * the "service mutex", whichever is appropriate for the service.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 */
697void
698svc_exit_thread(struct svc_rqst *rqstp)
699{
700 struct svc_serv *serv = rqstp->rq_server;
Greg Banks3262c812006-10-02 02:17:58 -0700701 struct svc_pool *pool = rqstp->rq_pool;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
703 svc_release_buffer(rqstp);
Jesper Juhla51482b2005-11-08 09:41:34 -0800704 kfree(rqstp->rq_resp);
705 kfree(rqstp->rq_argp);
706 kfree(rqstp->rq_auth_data);
Greg Banks3262c812006-10-02 02:17:58 -0700707
708 spin_lock_bh(&pool->sp_lock);
709 pool->sp_nrthreads--;
Greg Banksa7455442006-10-02 02:17:59 -0700710 list_del(&rqstp->rq_all);
Greg Banks3262c812006-10-02 02:17:58 -0700711 spin_unlock_bh(&pool->sp_lock);
712
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 kfree(rqstp);
714
715 /* Release the server */
716 if (serv)
717 svc_destroy(serv);
718}
Trond Myklebust24c37672008-12-23 16:30:12 -0500719EXPORT_SYMBOL_GPL(svc_exit_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
Chuck Levera26cfad2008-08-18 19:34:16 -0400721#ifdef CONFIG_SUNRPC_REGISTER_V4
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723/*
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500724 * Register an "inet" protocol family netid with the local
725 * rpcbind daemon via an rpcbind v4 SET request.
Chuck Levera26cfad2008-08-18 19:34:16 -0400726 *
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500727 * No netconfig infrastructure is available in the kernel, so
728 * we map IP_ protocol numbers to netids by hand.
Chuck Levera26cfad2008-08-18 19:34:16 -0400729 *
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500730 * Returns zero on success; a negative errno value is returned
731 * if any error occurs.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 */
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500733static int __svc_rpcb_register4(const u32 program, const u32 version,
734 const unsigned short protocol,
735 const unsigned short port)
Chuck Levera26cfad2008-08-18 19:34:16 -0400736{
737 struct sockaddr_in sin = {
738 .sin_family = AF_INET,
739 .sin_addr.s_addr = htonl(INADDR_ANY),
740 .sin_port = htons(port),
741 };
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500742 char *netid;
743
744 switch (protocol) {
745 case IPPROTO_UDP:
746 netid = RPCBIND_NETID_UDP;
747 break;
748 case IPPROTO_TCP:
749 netid = RPCBIND_NETID_TCP;
750 break;
751 default:
Chuck Leverba5c35e2009-03-18 20:46:59 -0400752 return -ENOPROTOOPT;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500753 }
754
755 return rpcb_v4_register(program, version,
756 (struct sockaddr *)&sin, netid);
757}
758
759/*
760 * Register an "inet6" protocol family netid with the local
761 * rpcbind daemon via an rpcbind v4 SET request.
762 *
763 * No netconfig infrastructure is available in the kernel, so
764 * we map IP_ protocol numbers to netids by hand.
765 *
766 * Returns zero on success; a negative errno value is returned
767 * if any error occurs.
768 */
769static int __svc_rpcb_register6(const u32 program, const u32 version,
770 const unsigned short protocol,
771 const unsigned short port)
772{
Chuck Levera26cfad2008-08-18 19:34:16 -0400773 struct sockaddr_in6 sin6 = {
774 .sin6_family = AF_INET6,
775 .sin6_addr = IN6ADDR_ANY_INIT,
776 .sin6_port = htons(port),
777 };
Chuck Levera26cfad2008-08-18 19:34:16 -0400778 char *netid;
779
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500780 switch (protocol) {
781 case IPPROTO_UDP:
782 netid = RPCBIND_NETID_UDP6;
783 break;
784 case IPPROTO_TCP:
785 netid = RPCBIND_NETID_TCP6;
786 break;
787 default:
Chuck Leverba5c35e2009-03-18 20:46:59 -0400788 return -ENOPROTOOPT;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500789 }
790
791 return rpcb_v4_register(program, version,
792 (struct sockaddr *)&sin6, netid);
793}
794
795/*
796 * Register a kernel RPC service via rpcbind version 4.
797 *
798 * Returns zero on success; a negative errno value is returned
799 * if any error occurs.
800 */
801static int __svc_register(const u32 program, const u32 version,
Chuck Lever4b62e582009-03-18 20:46:06 -0400802 const int family,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500803 const unsigned short protocol,
804 const unsigned short port)
805{
806 int error;
807
Chuck Levera26cfad2008-08-18 19:34:16 -0400808 switch (family) {
Chuck Lever4b62e582009-03-18 20:46:06 -0400809 case PF_INET:
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500810 return __svc_rpcb_register4(program, version,
811 protocol, port);
Chuck Lever4b62e582009-03-18 20:46:06 -0400812 case PF_INET6:
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500813 error = __svc_rpcb_register6(program, version,
814 protocol, port);
815 if (error < 0)
816 return error;
817
818 /*
819 * Work around bug in some versions of Linux rpcbind
820 * which don't allow registration of both inet and
821 * inet6 netids.
822 *
823 * Error return ignored for now.
824 */
825 __svc_rpcb_register4(program, version,
826 protocol, port);
827 return 0;
Chuck Levera26cfad2008-08-18 19:34:16 -0400828 }
829
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500830 return -EAFNOSUPPORT;
Chuck Levera26cfad2008-08-18 19:34:16 -0400831}
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500832
833#else /* CONFIG_SUNRPC_REGISTER_V4 */
834
835/*
836 * Register a kernel RPC service via rpcbind version 2.
837 *
838 * Returns zero on success; a negative errno value is returned
839 * if any error occurs.
840 */
Chuck Levera26cfad2008-08-18 19:34:16 -0400841static int __svc_register(const u32 program, const u32 version,
Chuck Lever4b62e582009-03-18 20:46:06 -0400842 const int family,
Chuck Levera26cfad2008-08-18 19:34:16 -0400843 const unsigned short protocol,
844 const unsigned short port)
845{
Chuck Lever4b62e582009-03-18 20:46:06 -0400846 if (family != PF_INET)
Chuck Levera26cfad2008-08-18 19:34:16 -0400847 return -EAFNOSUPPORT;
848
849 return rpcb_register(program, version, protocol, port);
850}
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500851
852#endif /* CONFIG_SUNRPC_REGISTER_V4 */
Chuck Levera26cfad2008-08-18 19:34:16 -0400853
854/**
855 * svc_register - register an RPC service with the local portmapper
856 * @serv: svc_serv struct for the service to register
Chuck Lever4b62e582009-03-18 20:46:06 -0400857 * @family: protocol family of service's listener socket
Chuck Levera26cfad2008-08-18 19:34:16 -0400858 * @proto: transport protocol number to advertise
859 * @port: port to advertise
860 *
Chuck Lever4b62e582009-03-18 20:46:06 -0400861 * Service is registered for any address in the passed-in protocol family
Chuck Levera26cfad2008-08-18 19:34:16 -0400862 */
Chuck Lever4b62e582009-03-18 20:46:06 -0400863int svc_register(const struct svc_serv *serv, const int family,
864 const unsigned short proto, const unsigned short port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865{
866 struct svc_program *progp;
Chuck Leverea339d42007-10-26 13:32:56 -0400867 unsigned int i;
Chuck Lever14aeb212008-08-18 19:34:00 -0400868 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Chuck Lever7252d572008-08-18 19:34:08 -0400870 BUG_ON(proto == 0 && port == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700872 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
873 for (i = 0; i < progp->pg_nvers; i++) {
874 if (progp->pg_vers[i] == NULL)
875 continue;
876
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500877 dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n",
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700878 progp->pg_name,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500879 i,
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700880 proto == IPPROTO_UDP? "udp" : "tcp",
881 port,
Chuck Lever4b62e582009-03-18 20:46:06 -0400882 family,
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700883 progp->pg_vers[i]->vs_hidden?
884 " (but not telling portmap)" : "");
885
886 if (progp->pg_vers[i]->vs_hidden)
887 continue;
888
Chuck Levera26cfad2008-08-18 19:34:16 -0400889 error = __svc_register(progp->pg_prog, i,
Chuck Lever4b62e582009-03-18 20:46:06 -0400890 family, proto, port);
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700891 if (error < 0)
892 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 }
894 }
895
Chuck Lever7252d572008-08-18 19:34:08 -0400896 return error;
897}
898
Chuck Leverf6fb3f62008-09-25 11:56:57 -0400899#ifdef CONFIG_SUNRPC_REGISTER_V4
900
901static void __svc_unregister(const u32 program, const u32 version,
902 const char *progname)
903{
904 struct sockaddr_in6 sin6 = {
905 .sin6_family = AF_INET6,
906 .sin6_addr = IN6ADDR_ANY_INIT,
907 .sin6_port = 0,
908 };
909 int error;
910
911 error = rpcb_v4_register(program, version,
912 (struct sockaddr *)&sin6, "");
913 dprintk("svc: %s(%sv%u), error %d\n",
914 __func__, progname, version, error);
915}
916
917#else /* CONFIG_SUNRPC_REGISTER_V4 */
918
919static void __svc_unregister(const u32 program, const u32 version,
920 const char *progname)
921{
922 int error;
923
924 error = rpcb_register(program, version, 0, 0);
925 dprintk("svc: %s(%sv%u), error %d\n",
926 __func__, progname, version, error);
927}
928
929#endif /* CONFIG_SUNRPC_REGISTER_V4 */
930
Chuck Lever7252d572008-08-18 19:34:08 -0400931/*
Chuck Leverf6fb3f62008-09-25 11:56:57 -0400932 * All netids, bind addresses and ports registered for [program, version]
933 * are removed from the local rpcbind database (if the service is not
934 * hidden) to make way for a new instance of the service.
Chuck Lever7252d572008-08-18 19:34:08 -0400935 *
Chuck Leverf6fb3f62008-09-25 11:56:57 -0400936 * The result of unregistration is reported via dprintk for those who want
937 * verification of the result, but is otherwise not important.
Chuck Lever7252d572008-08-18 19:34:08 -0400938 */
939static void svc_unregister(const struct svc_serv *serv)
940{
941 struct svc_program *progp;
942 unsigned long flags;
943 unsigned int i;
Chuck Lever7252d572008-08-18 19:34:08 -0400944
945 clear_thread_flag(TIF_SIGPENDING);
946
947 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
948 for (i = 0; i < progp->pg_nvers; i++) {
949 if (progp->pg_vers[i] == NULL)
950 continue;
951 if (progp->pg_vers[i]->vs_hidden)
952 continue;
953
Chuck Leverf6fb3f62008-09-25 11:56:57 -0400954 __svc_unregister(progp->pg_prog, i, progp->pg_name);
Chuck Lever7252d572008-08-18 19:34:08 -0400955 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 }
957
Chuck Lever7252d572008-08-18 19:34:08 -0400958 spin_lock_irqsave(&current->sighand->siglock, flags);
959 recalc_sigpending();
960 spin_unlock_irqrestore(&current->sighand->siglock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961}
962
963/*
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +0100964 * Printk the given error with the address of the client that caused it.
965 */
966static int
967__attribute__ ((format (printf, 2, 3)))
968svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
969{
970 va_list args;
971 int r;
972 char buf[RPC_MAX_ADDRBUFLEN];
973
974 if (!net_ratelimit())
975 return 0;
976
977 printk(KERN_WARNING "svc: %s: ",
978 svc_print_addr(rqstp, buf, sizeof(buf)));
979
980 va_start(args, fmt);
981 r = vprintk(fmt, args);
982 va_end(args);
983
984 return r;
985}
986
987/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 * Process the RPC request.
989 */
990int
NeilBrown6fb2b472006-10-02 02:17:50 -0700991svc_process(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992{
993 struct svc_program *progp;
994 struct svc_version *versp = NULL; /* compiler food */
995 struct svc_procedure *procp = NULL;
996 struct kvec * argv = &rqstp->rq_arg.head[0];
997 struct kvec * resv = &rqstp->rq_res.head[0];
NeilBrown6fb2b472006-10-02 02:17:50 -0700998 struct svc_serv *serv = rqstp->rq_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 kxdrproc_t xdr;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001000 __be32 *statp;
1001 u32 dir, prog, vers, proc;
1002 __be32 auth_stat, rpc_stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 int auth_res;
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -07001004 __be32 *reply_statp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005
1006 rpc_stat = rpc_success;
1007
1008 if (argv->iov_len < 6*4)
1009 goto err_short_len;
1010
1011 /* setup response xdr_buf.
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001012 * Initially it has just one page
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 */
NeilBrown44524352006-10-04 02:15:46 -07001014 rqstp->rq_resused = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 resv->iov_base = page_address(rqstp->rq_respages[0]);
1016 resv->iov_len = 0;
NeilBrown44524352006-10-04 02:15:46 -07001017 rqstp->rq_res.pages = rqstp->rq_respages + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 rqstp->rq_res.len = 0;
1019 rqstp->rq_res.page_base = 0;
1020 rqstp->rq_res.page_len = 0;
Trond Myklebust334ccfd2005-06-22 17:16:19 +00001021 rqstp->rq_res.buflen = PAGE_SIZE;
J. Bruce Fields7c9fdcf2006-06-30 01:56:19 -07001022 rqstp->rq_res.tail[0].iov_base = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 rqstp->rq_res.tail[0].iov_len = 0;
J. Bruce Fields5c04c462006-06-30 01:56:19 -07001024 /* Will be turned off only in gss privacy case: */
Jens Axboecf8208d2007-06-12 21:22:14 +02001025 rqstp->rq_splice_ok = 1;
Tom Tuckere831fe62007-12-30 21:07:29 -06001026
1027 /* Setup reply header */
1028 rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029
1030 rqstp->rq_xid = svc_getu32(argv);
1031 svc_putu32(resv, rqstp->rq_xid);
1032
Alexey Dobriyan76994312006-09-26 22:28:46 -07001033 dir = svc_getnl(argv);
1034 vers = svc_getnl(argv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035
1036 /* First words of reply: */
Alexey Dobriyan76994312006-09-26 22:28:46 -07001037 svc_putnl(resv, 1); /* REPLY */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038
1039 if (dir != 0) /* direction != CALL */
1040 goto err_bad_dir;
1041 if (vers != 2) /* RPC version number */
1042 goto err_bad_rpc;
1043
1044 /* Save position in case we later decide to reject: */
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -07001045 reply_statp = resv->iov_base + resv->iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
Alexey Dobriyan76994312006-09-26 22:28:46 -07001047 svc_putnl(resv, 0); /* ACCEPT */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048
Alexey Dobriyan76994312006-09-26 22:28:46 -07001049 rqstp->rq_prog = prog = svc_getnl(argv); /* program number */
1050 rqstp->rq_vers = vers = svc_getnl(argv); /* version number */
1051 rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052
1053 progp = serv->sv_program;
NeilBrown80d188a2005-11-07 01:00:27 -08001054
1055 for (progp = serv->sv_program; progp; progp = progp->pg_next)
1056 if (prog == progp->pg_prog)
1057 break;
1058
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 /*
1060 * Decode auth data, and add verifier to reply buffer.
1061 * We do this before anything else in order to get a decent
1062 * auth verifier.
1063 */
1064 auth_res = svc_authenticate(rqstp, &auth_stat);
1065 /* Also give the program a chance to reject this call: */
NeilBrown80d188a2005-11-07 01:00:27 -08001066 if (auth_res == SVC_OK && progp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 auth_stat = rpc_autherr_badcred;
1068 auth_res = progp->pg_authenticate(rqstp);
1069 }
1070 switch (auth_res) {
1071 case SVC_OK:
1072 break;
1073 case SVC_GARBAGE:
Harshula Jayasuriyadd352102008-02-20 10:56:56 +11001074 goto err_garbage;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 case SVC_SYSERR:
1076 rpc_stat = rpc_system_err;
1077 goto err_bad;
1078 case SVC_DENIED:
1079 goto err_bad_auth;
1080 case SVC_DROP:
1081 goto dropit;
1082 case SVC_COMPLETE:
1083 goto sendit;
1084 }
NeilBrown80d188a2005-11-07 01:00:27 -08001085
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +00001086 if (progp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 goto err_bad_prog;
1088
1089 if (vers >= progp->pg_nvers ||
1090 !(versp = progp->pg_vers[vers]))
1091 goto err_bad_vers;
1092
1093 procp = versp->vs_proc + proc;
1094 if (proc >= versp->vs_nproc || !procp->pc_func)
1095 goto err_bad_proc;
1096 rqstp->rq_server = serv;
1097 rqstp->rq_procinfo = procp;
1098
1099 /* Syntactic check complete */
1100 serv->sv_stats->rpccnt++;
1101
1102 /* Build the reply header. */
1103 statp = resv->iov_base +resv->iov_len;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001104 svc_putnl(resv, RPC_SUCCESS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105
1106 /* Bump per-procedure stats counter */
1107 procp->pc_count++;
1108
1109 /* Initialize storage for argp and resp */
1110 memset(rqstp->rq_argp, 0, procp->pc_argsize);
1111 memset(rqstp->rq_resp, 0, procp->pc_ressize);
1112
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001113 /* un-reserve some of the out-queue now that we have a
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 * better idea of reply size
1115 */
1116 if (procp->pc_xdrressize)
Jeff Laytoncd123012007-05-09 02:34:50 -07001117 svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118
1119 /* Call the function that processes the request. */
1120 if (!versp->vs_dispatch) {
1121 /* Decode arguments */
1122 xdr = procp->pc_decode;
1123 if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
1124 goto err_garbage;
1125
1126 *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
1127
1128 /* Encode reply */
NeilBrownd343fce2006-10-17 00:10:18 -07001129 if (*statp == rpc_drop_reply) {
1130 if (procp->pc_release)
1131 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1132 goto dropit;
1133 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 if (*statp == rpc_success && (xdr = procp->pc_encode)
1135 && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
1136 dprintk("svc: failed to encode reply\n");
1137 /* serv->sv_stats->rpcsystemerr++; */
1138 *statp = rpc_system_err;
1139 }
1140 } else {
1141 dprintk("svc: calling dispatcher\n");
1142 if (!versp->vs_dispatch(rqstp, statp)) {
1143 /* Release reply info */
1144 if (procp->pc_release)
1145 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1146 goto dropit;
1147 }
1148 }
1149
1150 /* Check RPC status result */
1151 if (*statp != rpc_success)
1152 resv->iov_len = ((void*)statp) - resv->iov_base + 4;
1153
1154 /* Release reply info */
1155 if (procp->pc_release)
1156 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1157
1158 if (procp->pc_encode == NULL)
1159 goto dropit;
1160
1161 sendit:
1162 if (svc_authorise(rqstp))
1163 goto dropit;
1164 return svc_send(rqstp);
1165
1166 dropit:
1167 svc_authorise(rqstp); /* doesn't hurt to call this twice */
1168 dprintk("svc: svc_process dropit\n");
1169 svc_drop(rqstp);
1170 return 0;
1171
1172err_short_len:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001173 svc_printk(rqstp, "short len %Zd, dropping request\n",
1174 argv->iov_len);
NeilBrown34e9a632007-01-29 13:19:52 -08001175
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 goto dropit; /* drop request */
1177
1178err_bad_dir:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001179 svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
NeilBrown34e9a632007-01-29 13:19:52 -08001180
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 serv->sv_stats->rpcbadfmt++;
1182 goto dropit; /* drop request */
1183
1184err_bad_rpc:
1185 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001186 svc_putnl(resv, 1); /* REJECT */
1187 svc_putnl(resv, 0); /* RPC_MISMATCH */
1188 svc_putnl(resv, 2); /* Only RPCv2 supported */
1189 svc_putnl(resv, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 goto sendit;
1191
1192err_bad_auth:
1193 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
1194 serv->sv_stats->rpcbadauth++;
1195 /* Restore write pointer to location of accept status: */
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -07001196 xdr_ressize_check(rqstp, reply_statp);
Alexey Dobriyan76994312006-09-26 22:28:46 -07001197 svc_putnl(resv, 1); /* REJECT */
1198 svc_putnl(resv, 1); /* AUTH_ERROR */
1199 svc_putnl(resv, ntohl(auth_stat)); /* status */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 goto sendit;
1201
1202err_bad_prog:
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +00001203 dprintk("svc: unknown program %d\n", prog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001205 svc_putnl(resv, RPC_PROG_UNAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 goto sendit;
1207
1208err_bad_vers:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001209 svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
NeilBrown34e9a632007-01-29 13:19:52 -08001210 vers, prog, progp->pg_name);
1211
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001213 svc_putnl(resv, RPC_PROG_MISMATCH);
1214 svc_putnl(resv, progp->pg_lovers);
1215 svc_putnl(resv, progp->pg_hivers);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 goto sendit;
1217
1218err_bad_proc:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001219 svc_printk(rqstp, "unknown procedure (%d)\n", proc);
NeilBrown34e9a632007-01-29 13:19:52 -08001220
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001222 svc_putnl(resv, RPC_PROC_UNAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 goto sendit;
1224
1225err_garbage:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001226 svc_printk(rqstp, "failed to decode args\n");
NeilBrown34e9a632007-01-29 13:19:52 -08001227
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 rpc_stat = rpc_garbage_args;
1229err_bad:
1230 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001231 svc_putnl(resv, ntohl(rpc_stat));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 goto sendit;
1233}
Trond Myklebust24c37672008-12-23 16:30:12 -05001234EXPORT_SYMBOL_GPL(svc_process);
Greg Banks7adae482006-10-04 02:15:47 -07001235
1236/*
1237 * Return (transport-specific) limit on the rpc payload.
1238 */
1239u32 svc_max_payload(const struct svc_rqst *rqstp)
1240{
Tom Tucker49023152007-12-30 21:07:21 -06001241 u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
Greg Banks7adae482006-10-04 02:15:47 -07001242
NeilBrownc6b0a9f2006-10-06 00:44:05 -07001243 if (rqstp->rq_server->sv_max_payload < max)
1244 max = rqstp->rq_server->sv_max_payload;
Greg Banks7adae482006-10-04 02:15:47 -07001245 return max;
1246}
1247EXPORT_SYMBOL_GPL(svc_max_payload);