]>
Commit | Line | Data |
---|---|---|
457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/net/sunrpc/svc.c | |
4 | * | |
5 | * High-level RPC service routines | |
6 | * | |
7 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
bfd24160 GB |
8 | * |
9 | * Multiple threads pools and NUMAisation | |
10 | * Copyright (c) 2006 Silicon Graphics, Inc. | |
11 | * by Greg Banks <gnb@melbourne.sgi.com> | |
1da177e4 LT |
12 | */ |
13 | ||
14 | #include <linux/linkage.h> | |
3f07c014 | 15 | #include <linux/sched/signal.h> |
1da177e4 LT |
16 | #include <linux/errno.h> |
17 | #include <linux/net.h> | |
18 | #include <linux/in.h> | |
19 | #include <linux/mm.h> | |
a7455442 GB |
20 | #include <linux/interrupt.h> |
21 | #include <linux/module.h> | |
9867d76c | 22 | #include <linux/kthread.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
1da177e4 LT |
24 | |
25 | #include <linux/sunrpc/types.h> | |
26 | #include <linux/sunrpc/xdr.h> | |
27 | #include <linux/sunrpc/stats.h> | |
28 | #include <linux/sunrpc/svcsock.h> | |
29 | #include <linux/sunrpc/clnt.h> | |
4d6bbb62 | 30 | #include <linux/sunrpc/bc_xprt.h> |
1da177e4 | 31 | |
860a0d9e JL |
32 | #include <trace/events/sunrpc.h> |
33 | ||
1da177e4 | 34 | #define RPCDBG_FACILITY RPCDBG_SVCDSP |
1da177e4 | 35 | |
5247fab5 | 36 | static void svc_unregister(const struct svc_serv *serv, struct net *net); |
7252d575 | 37 | |
c369014f | 38 | #define svc_serv_is_pooled(serv) ((serv)->sv_ops->svo_function) |
42a7fc4a | 39 | |
42a7fc4a | 40 | #define SVC_POOL_DEFAULT SVC_POOL_GLOBAL |
bfd24160 GB |
41 | |
42 | /* | |
43 | * Structure for mapping cpus to pools and vice versa. | |
44 | * Setup once during sunrpc initialisation. | |
45 | */ | |
d70bc0c6 | 46 | struct svc_pool_map svc_pool_map = { |
42a7fc4a | 47 | .mode = SVC_POOL_DEFAULT |
bfd24160 | 48 | }; |
d70bc0c6 JL |
49 | EXPORT_SYMBOL_GPL(svc_pool_map); |
50 | ||
42a7fc4a GB |
51 | static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */ |
52 | ||
53 | static int | |
e4dca7b7 | 54 | param_set_pool_mode(const char *val, const struct kernel_param *kp) |
42a7fc4a GB |
55 | { |
56 | int *ip = (int *)kp->arg; | |
57 | struct svc_pool_map *m = &svc_pool_map; | |
58 | int err; | |
59 | ||
60 | mutex_lock(&svc_pool_map_mutex); | |
61 | ||
62 | err = -EBUSY; | |
63 | if (m->count) | |
64 | goto out; | |
65 | ||
66 | err = 0; | |
67 | if (!strncmp(val, "auto", 4)) | |
68 | *ip = SVC_POOL_AUTO; | |
69 | else if (!strncmp(val, "global", 6)) | |
70 | *ip = SVC_POOL_GLOBAL; | |
71 | else if (!strncmp(val, "percpu", 6)) | |
72 | *ip = SVC_POOL_PERCPU; | |
73 | else if (!strncmp(val, "pernode", 7)) | |
74 | *ip = SVC_POOL_PERNODE; | |
75 | else | |
76 | err = -EINVAL; | |
77 | ||
78 | out: | |
79 | mutex_unlock(&svc_pool_map_mutex); | |
80 | return err; | |
81 | } | |
82 | ||
83 | static int | |
e4dca7b7 | 84 | param_get_pool_mode(char *buf, const struct kernel_param *kp) |
42a7fc4a GB |
85 | { |
86 | int *ip = (int *)kp->arg; | |
87 | ||
88 | switch (*ip) | |
89 | { | |
90 | case SVC_POOL_AUTO: | |
746c6237 | 91 | return strlcpy(buf, "auto\n", 20); |
42a7fc4a | 92 | case SVC_POOL_GLOBAL: |
746c6237 | 93 | return strlcpy(buf, "global\n", 20); |
42a7fc4a | 94 | case SVC_POOL_PERCPU: |
746c6237 | 95 | return strlcpy(buf, "percpu\n", 20); |
42a7fc4a | 96 | case SVC_POOL_PERNODE: |
746c6237 | 97 | return strlcpy(buf, "pernode\n", 20); |
42a7fc4a | 98 | default: |
746c6237 | 99 | return sprintf(buf, "%d\n", *ip); |
42a7fc4a GB |
100 | } |
101 | } | |
bfd24160 | 102 | |
42a7fc4a GB |
103 | module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode, |
104 | &svc_pool_map.mode, 0644); | |
bfd24160 GB |
105 | |
106 | /* | |
107 | * Detect best pool mapping mode heuristically, | |
108 | * according to the machine's topology. | |
109 | */ | |
110 | static int | |
111 | svc_pool_map_choose_mode(void) | |
112 | { | |
113 | unsigned int node; | |
114 | ||
62bc62a8 | 115 | if (nr_online_nodes > 1) { |
bfd24160 GB |
116 | /* |
117 | * Actually have multiple NUMA nodes, | |
118 | * so split pools on NUMA node boundaries | |
119 | */ | |
120 | return SVC_POOL_PERNODE; | |
121 | } | |
122 | ||
72c33688 | 123 | node = first_online_node; |
bfd24160 GB |
124 | if (nr_cpus_node(node) > 2) { |
125 | /* | |
126 | * Non-trivial SMP, or CONFIG_NUMA on | |
127 | * non-NUMA hardware, e.g. with a generic | |
128 | * x86_64 kernel on Xeons. In this case we | |
129 | * want to divide the pools on cpu boundaries. | |
130 | */ | |
131 | return SVC_POOL_PERCPU; | |
132 | } | |
133 | ||
134 | /* default: one global pool */ | |
135 | return SVC_POOL_GLOBAL; | |
136 | } | |
137 | ||
138 | /* | |
139 | * Allocate the to_pool[] and pool_to[] arrays. | |
140 | * Returns 0 on success or an errno. | |
141 | */ | |
142 | static int | |
143 | svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools) | |
144 | { | |
145 | m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); | |
146 | if (!m->to_pool) | |
147 | goto fail; | |
148 | m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL); | |
149 | if (!m->pool_to) | |
150 | goto fail_free; | |
151 | ||
152 | return 0; | |
153 | ||
154 | fail_free: | |
155 | kfree(m->to_pool); | |
61c8504c | 156 | m->to_pool = NULL; |
bfd24160 GB |
157 | fail: |
158 | return -ENOMEM; | |
159 | } | |
160 | ||
161 | /* | |
162 | * Initialise the pool map for SVC_POOL_PERCPU mode. | |
163 | * Returns number of pools or <0 on error. | |
164 | */ | |
165 | static int | |
166 | svc_pool_map_init_percpu(struct svc_pool_map *m) | |
167 | { | |
53b8a315 | 168 | unsigned int maxpools = nr_cpu_ids; |
bfd24160 GB |
169 | unsigned int pidx = 0; |
170 | unsigned int cpu; | |
171 | int err; | |
172 | ||
173 | err = svc_pool_map_alloc_arrays(m, maxpools); | |
174 | if (err) | |
175 | return err; | |
176 | ||
177 | for_each_online_cpu(cpu) { | |
eb63192b | 178 | BUG_ON(pidx >= maxpools); |
bfd24160 GB |
179 | m->to_pool[cpu] = pidx; |
180 | m->pool_to[pidx] = cpu; | |
181 | pidx++; | |
182 | } | |
183 | /* cpus brought online later all get mapped to pool0, sorry */ | |
184 | ||
185 | return pidx; | |
186 | }; | |
187 | ||
188 | ||
189 | /* | |
190 | * Initialise the pool map for SVC_POOL_PERNODE mode. | |
191 | * Returns number of pools or <0 on error. | |
192 | */ | |
193 | static int | |
194 | svc_pool_map_init_pernode(struct svc_pool_map *m) | |
195 | { | |
74c7aa8b | 196 | unsigned int maxpools = nr_node_ids; |
bfd24160 GB |
197 | unsigned int pidx = 0; |
198 | unsigned int node; | |
199 | int err; | |
200 | ||
201 | err = svc_pool_map_alloc_arrays(m, maxpools); | |
202 | if (err) | |
203 | return err; | |
204 | ||
205 | for_each_node_with_cpus(node) { | |
206 | /* some architectures (e.g. SN2) have cpuless nodes */ | |
207 | BUG_ON(pidx > maxpools); | |
208 | m->to_pool[node] = pidx; | |
209 | m->pool_to[pidx] = node; | |
210 | pidx++; | |
211 | } | |
212 | /* nodes brought online later all get mapped to pool0, sorry */ | |
213 | ||
214 | return pidx; | |
215 | } | |
216 | ||
217 | ||
218 | /* | |
42a7fc4a GB |
219 | * Add a reference to the global map of cpus to pools (and |
220 | * vice versa). Initialise the map if we're the first user. | |
221 | * Returns the number of pools. | |
bfd24160 | 222 | */ |
d70bc0c6 | 223 | unsigned int |
42a7fc4a | 224 | svc_pool_map_get(void) |
bfd24160 GB |
225 | { |
226 | struct svc_pool_map *m = &svc_pool_map; | |
227 | int npools = -1; | |
228 | ||
42a7fc4a GB |
229 | mutex_lock(&svc_pool_map_mutex); |
230 | ||
231 | if (m->count++) { | |
232 | mutex_unlock(&svc_pool_map_mutex); | |
bfd24160 | 233 | return m->npools; |
42a7fc4a | 234 | } |
bfd24160 | 235 | |
42a7fc4a GB |
236 | if (m->mode == SVC_POOL_AUTO) |
237 | m->mode = svc_pool_map_choose_mode(); | |
bfd24160 GB |
238 | |
239 | switch (m->mode) { | |
240 | case SVC_POOL_PERCPU: | |
241 | npools = svc_pool_map_init_percpu(m); | |
242 | break; | |
243 | case SVC_POOL_PERNODE: | |
244 | npools = svc_pool_map_init_pernode(m); | |
245 | break; | |
246 | } | |
247 | ||
248 | if (npools < 0) { | |
249 | /* default, or memory allocation failure */ | |
250 | npools = 1; | |
251 | m->mode = SVC_POOL_GLOBAL; | |
252 | } | |
253 | m->npools = npools; | |
254 | ||
42a7fc4a | 255 | mutex_unlock(&svc_pool_map_mutex); |
bfd24160 GB |
256 | return m->npools; |
257 | } | |
d70bc0c6 | 258 | EXPORT_SYMBOL_GPL(svc_pool_map_get); |
42a7fc4a GB |
259 | |
260 | /* | |
261 | * Drop a reference to the global map of cpus to pools. | |
262 | * When the last reference is dropped, the map data is | |
263 | * freed; this allows the sysadmin to change the pool | |
264 | * mode using the pool_mode module option without | |
265 | * rebooting or re-loading sunrpc.ko. | |
266 | */ | |
d70bc0c6 | 267 | void |
42a7fc4a GB |
268 | svc_pool_map_put(void) |
269 | { | |
270 | struct svc_pool_map *m = &svc_pool_map; | |
271 | ||
272 | mutex_lock(&svc_pool_map_mutex); | |
273 | ||
274 | if (!--m->count) { | |
42a7fc4a | 275 | kfree(m->to_pool); |
61c8504c | 276 | m->to_pool = NULL; |
42a7fc4a | 277 | kfree(m->pool_to); |
61c8504c | 278 | m->pool_to = NULL; |
42a7fc4a GB |
279 | m->npools = 0; |
280 | } | |
281 | ||
282 | mutex_unlock(&svc_pool_map_mutex); | |
283 | } | |
d70bc0c6 | 284 | EXPORT_SYMBOL_GPL(svc_pool_map_put); |
42a7fc4a | 285 | |
11fd165c ED |
286 | static int svc_pool_map_get_node(unsigned int pidx) |
287 | { | |
288 | const struct svc_pool_map *m = &svc_pool_map; | |
289 | ||
290 | if (m->count) { | |
291 | if (m->mode == SVC_POOL_PERCPU) | |
292 | return cpu_to_node(m->pool_to[pidx]); | |
293 | if (m->mode == SVC_POOL_PERNODE) | |
294 | return m->pool_to[pidx]; | |
295 | } | |
296 | return NUMA_NO_NODE; | |
297 | } | |
bfd24160 | 298 | /* |
9867d76c | 299 | * Set the given thread's cpus_allowed mask so that it |
bfd24160 | 300 | * will only run on cpus in the given pool. |
bfd24160 | 301 | */ |
9867d76c JL |
302 | static inline void |
303 | svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx) | |
bfd24160 GB |
304 | { |
305 | struct svc_pool_map *m = &svc_pool_map; | |
9867d76c | 306 | unsigned int node = m->pool_to[pidx]; |
bfd24160 GB |
307 | |
308 | /* | |
309 | * The caller checks for sv_nrpools > 1, which | |
42a7fc4a | 310 | * implies that we've been initialized. |
bfd24160 | 311 | */ |
1bd58aaf WAA |
312 | WARN_ON_ONCE(m->count == 0); |
313 | if (m->count == 0) | |
314 | return; | |
bfd24160 | 315 | |
9867d76c | 316 | switch (m->mode) { |
bfd24160 | 317 | case SVC_POOL_PERCPU: |
c5f59f08 | 318 | { |
aa85ea5b | 319 | set_cpus_allowed_ptr(task, cpumask_of(node)); |
9867d76c | 320 | break; |
c5f59f08 | 321 | } |
bfd24160 | 322 | case SVC_POOL_PERNODE: |
c5f59f08 | 323 | { |
a70f7302 | 324 | set_cpus_allowed_ptr(task, cpumask_of_node(node)); |
9867d76c | 325 | break; |
bfd24160 | 326 | } |
c5f59f08 | 327 | } |
bfd24160 GB |
328 | } |
329 | ||
330 | /* | |
331 | * Use the mapping mode to choose a pool for a given CPU. | |
332 | * Used when enqueueing an incoming RPC. Always returns | |
333 | * a non-NULL pool pointer. | |
334 | */ | |
335 | struct svc_pool * | |
336 | svc_pool_for_cpu(struct svc_serv *serv, int cpu) | |
337 | { | |
338 | struct svc_pool_map *m = &svc_pool_map; | |
339 | unsigned int pidx = 0; | |
340 | ||
341 | /* | |
42a7fc4a | 342 | * An uninitialised map happens in a pure client when |
bfd24160 GB |
343 | * lockd is brought up, so silently treat it the |
344 | * same as SVC_POOL_GLOBAL. | |
345 | */ | |
42a7fc4a GB |
346 | if (svc_serv_is_pooled(serv)) { |
347 | switch (m->mode) { | |
348 | case SVC_POOL_PERCPU: | |
349 | pidx = m->to_pool[cpu]; | |
350 | break; | |
351 | case SVC_POOL_PERNODE: | |
352 | pidx = m->to_pool[cpu_to_node(cpu)]; | |
353 | break; | |
354 | } | |
bfd24160 GB |
355 | } |
356 | return &serv->sv_pools[pidx % serv->sv_nrpools]; | |
357 | } | |
358 | ||
bb2224df | 359 | int svc_rpcb_setup(struct svc_serv *serv, struct net *net) |
d9908560 SK |
360 | { |
361 | int err; | |
362 | ||
bee42f68 | 363 | err = rpcb_create_local(net); |
d9908560 SK |
364 | if (err) |
365 | return err; | |
366 | ||
367 | /* Remove any stale portmap registrations */ | |
bee42f68 | 368 | svc_unregister(serv, net); |
d9908560 SK |
369 | return 0; |
370 | } | |
bb2224df | 371 | EXPORT_SYMBOL_GPL(svc_rpcb_setup); |
d9908560 | 372 | |
5ecebb7c | 373 | void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net) |
d9908560 | 374 | { |
5ecebb7c SK |
375 | svc_unregister(serv, net); |
376 | rpcb_put_local(net); | |
d9908560 | 377 | } |
16d05870 | 378 | EXPORT_SYMBOL_GPL(svc_rpcb_cleanup); |
d9908560 SK |
379 | |
380 | static int svc_uses_rpcbind(struct svc_serv *serv) | |
381 | { | |
382 | struct svc_program *progp; | |
383 | unsigned int i; | |
384 | ||
385 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { | |
386 | for (i = 0; i < progp->pg_nvers; i++) { | |
387 | if (progp->pg_vers[i] == NULL) | |
388 | continue; | |
05a45a2d | 389 | if (!progp->pg_vers[i]->vs_hidden) |
d9908560 SK |
390 | return 1; |
391 | } | |
392 | } | |
393 | ||
394 | return 0; | |
395 | } | |
bfd24160 | 396 | |
9793f7c8 SK |
397 | int svc_bind(struct svc_serv *serv, struct net *net) |
398 | { | |
399 | if (!svc_uses_rpcbind(serv)) | |
400 | return 0; | |
401 | return svc_rpcb_setup(serv, net); | |
402 | } | |
403 | EXPORT_SYMBOL_GPL(svc_bind); | |
404 | ||
d0025268 TM |
405 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
406 | static void | |
407 | __svc_init_bc(struct svc_serv *serv) | |
408 | { | |
409 | INIT_LIST_HEAD(&serv->sv_cb_list); | |
410 | spin_lock_init(&serv->sv_cb_lock); | |
411 | init_waitqueue_head(&serv->sv_cb_waitq); | |
412 | } | |
413 | #else | |
414 | static void | |
415 | __svc_init_bc(struct svc_serv *serv) | |
416 | { | |
417 | } | |
418 | #endif | |
419 | ||
1da177e4 LT |
420 | /* |
421 | * Create an RPC service | |
422 | */ | |
a7455442 GB |
423 | static struct svc_serv * |
424 | __svc_create(struct svc_program *prog, unsigned int bufsize, int npools, | |
afea5657 | 425 | const struct svc_serv_ops *ops) |
1da177e4 LT |
426 | { |
427 | struct svc_serv *serv; | |
ea339d46 | 428 | unsigned int vers; |
1da177e4 | 429 | unsigned int xdrsize; |
3262c816 | 430 | unsigned int i; |
1da177e4 | 431 | |
0da974f4 | 432 | if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL))) |
1da177e4 | 433 | return NULL; |
9ba02638 | 434 | serv->sv_name = prog->pg_name; |
1da177e4 LT |
435 | serv->sv_program = prog; |
436 | serv->sv_nrthreads = 1; | |
437 | serv->sv_stats = prog->pg_stats; | |
c6b0a9f8 N |
438 | if (bufsize > RPCSVC_MAXPAYLOAD) |
439 | bufsize = RPCSVC_MAXPAYLOAD; | |
440 | serv->sv_max_payload = bufsize? bufsize : 4096; | |
441 | serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE); | |
ea126e74 | 442 | serv->sv_ops = ops; |
1da177e4 | 443 | xdrsize = 0; |
9ba02638 AG |
444 | while (prog) { |
445 | prog->pg_lovers = prog->pg_nvers-1; | |
446 | for (vers=0; vers<prog->pg_nvers ; vers++) | |
447 | if (prog->pg_vers[vers]) { | |
448 | prog->pg_hivers = vers; | |
449 | if (prog->pg_lovers > vers) | |
450 | prog->pg_lovers = vers; | |
451 | if (prog->pg_vers[vers]->vs_xdrsize > xdrsize) | |
452 | xdrsize = prog->pg_vers[vers]->vs_xdrsize; | |
453 | } | |
454 | prog = prog->pg_next; | |
455 | } | |
1da177e4 | 456 | serv->sv_xdrsize = xdrsize; |
1da177e4 LT |
457 | INIT_LIST_HEAD(&serv->sv_tempsocks); |
458 | INIT_LIST_HEAD(&serv->sv_permsocks); | |
ff861c4d | 459 | timer_setup(&serv->sv_temptimer, NULL, 0); |
1da177e4 LT |
460 | spin_lock_init(&serv->sv_lock); |
461 | ||
d0025268 TM |
462 | __svc_init_bc(serv); |
463 | ||
a7455442 | 464 | serv->sv_nrpools = npools; |
3262c816 | 465 | serv->sv_pools = |
cd861280 | 466 | kcalloc(serv->sv_nrpools, sizeof(struct svc_pool), |
3262c816 GB |
467 | GFP_KERNEL); |
468 | if (!serv->sv_pools) { | |
469 | kfree(serv); | |
470 | return NULL; | |
471 | } | |
472 | ||
473 | for (i = 0; i < serv->sv_nrpools; i++) { | |
474 | struct svc_pool *pool = &serv->sv_pools[i]; | |
475 | ||
46121cf7 | 476 | dprintk("svc: initialising pool %u for %s\n", |
3262c816 GB |
477 | i, serv->sv_name); |
478 | ||
479 | pool->sp_id = i; | |
3262c816 | 480 | INIT_LIST_HEAD(&pool->sp_sockets); |
a7455442 | 481 | INIT_LIST_HEAD(&pool->sp_all_threads); |
3262c816 GB |
482 | spin_lock_init(&pool->sp_lock); |
483 | } | |
484 | ||
1da177e4 LT |
485 | return serv; |
486 | } | |
487 | ||
a7455442 GB |
488 | struct svc_serv * |
489 | svc_create(struct svc_program *prog, unsigned int bufsize, | |
afea5657 | 490 | const struct svc_serv_ops *ops) |
a7455442 | 491 | { |
ea126e74 | 492 | return __svc_create(prog, bufsize, /*npools*/1, ops); |
a7455442 | 493 | } |
24c3767e | 494 | EXPORT_SYMBOL_GPL(svc_create); |
a7455442 GB |
495 | |
496 | struct svc_serv * | |
497 | svc_create_pooled(struct svc_program *prog, unsigned int bufsize, | |
afea5657 | 498 | const struct svc_serv_ops *ops) |
a7455442 GB |
499 | { |
500 | struct svc_serv *serv; | |
42a7fc4a | 501 | unsigned int npools = svc_pool_map_get(); |
a7455442 | 502 | |
ea126e74 | 503 | serv = __svc_create(prog, bufsize, npools, ops); |
067f96ef JL |
504 | if (!serv) |
505 | goto out_err; | |
a7455442 | 506 | return serv; |
067f96ef JL |
507 | out_err: |
508 | svc_pool_map_put(); | |
509 | return NULL; | |
a7455442 | 510 | } |
24c3767e | 511 | EXPORT_SYMBOL_GPL(svc_create_pooled); |
a7455442 | 512 | |
074d0f67 SK |
513 | void svc_shutdown_net(struct svc_serv *serv, struct net *net) |
514 | { | |
074d0f67 SK |
515 | svc_close_net(serv, net); |
516 | ||
ea126e74 JL |
517 | if (serv->sv_ops->svo_shutdown) |
518 | serv->sv_ops->svo_shutdown(serv, net); | |
074d0f67 SK |
519 | } |
520 | EXPORT_SYMBOL_GPL(svc_shutdown_net); | |
521 | ||
1da177e4 | 522 | /* |
bedbdd8b NB |
523 | * Destroy an RPC service. Should be called with appropriate locking to |
524 | * protect the sv_nrthreads, sv_permsocks and sv_tempsocks. | |
1da177e4 LT |
525 | */ |
526 | void | |
527 | svc_destroy(struct svc_serv *serv) | |
528 | { | |
46121cf7 | 529 | dprintk("svc: svc_destroy(%s, %d)\n", |
1da177e4 LT |
530 | serv->sv_program->pg_name, |
531 | serv->sv_nrthreads); | |
532 | ||
533 | if (serv->sv_nrthreads) { | |
534 | if (--(serv->sv_nrthreads) != 0) { | |
535 | svc_sock_update_bufs(serv); | |
536 | return; | |
537 | } | |
538 | } else | |
539 | printk("svc_destroy: no threads for serv=%p!\n", serv); | |
540 | ||
36bdfc8b | 541 | del_timer_sync(&serv->sv_temptimer); |
074d0f67 | 542 | |
7b147f1f SK |
543 | /* |
544 | * The last user is gone and thus all sockets have to be destroyed to | |
545 | * the point. Check this. | |
546 | */ | |
547 | BUG_ON(!list_empty(&serv->sv_permsocks)); | |
548 | BUG_ON(!list_empty(&serv->sv_tempsocks)); | |
cda1fd4a | 549 | |
1da177e4 LT |
550 | cache_clean_deferred(serv); |
551 | ||
42a7fc4a GB |
552 | if (svc_serv_is_pooled(serv)) |
553 | svc_pool_map_put(); | |
554 | ||
3262c816 | 555 | kfree(serv->sv_pools); |
1da177e4 LT |
556 | kfree(serv); |
557 | } | |
24c3767e | 558 | EXPORT_SYMBOL_GPL(svc_destroy); |
1da177e4 LT |
559 | |
560 | /* | |
561 | * Allocate an RPC server's buffer space. | |
4ff923ce | 562 | * We allocate pages and place them in rq_pages. |
1da177e4 LT |
563 | */ |
564 | static int | |
11fd165c | 565 | svc_init_buffer(struct svc_rqst *rqstp, unsigned int size, int node) |
1da177e4 | 566 | { |
0dc220f0 | 567 | unsigned int pages, arghi; |
cca5172a | 568 | |
ba17686f AA |
569 | /* bc_xprt uses fore channel allocated buffers */ |
570 | if (svc_is_backchannel(rqstp)) | |
571 | return 1; | |
572 | ||
c6b0a9f8 N |
573 | pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply. |
574 | * We assume one is at most one page | |
575 | */ | |
1da177e4 | 576 | arghi = 0; |
b25cd058 WAA |
577 | WARN_ON_ONCE(pages > RPCSVC_MAXPAGES); |
578 | if (pages > RPCSVC_MAXPAGES) | |
579 | pages = RPCSVC_MAXPAGES; | |
1da177e4 | 580 | while (pages) { |
11fd165c | 581 | struct page *p = alloc_pages_node(node, GFP_KERNEL, 0); |
1da177e4 LT |
582 | if (!p) |
583 | break; | |
44524359 | 584 | rqstp->rq_pages[arghi++] = p; |
1da177e4 LT |
585 | pages--; |
586 | } | |
0dc220f0 | 587 | return pages == 0; |
1da177e4 LT |
588 | } |
589 | ||
590 | /* | |
591 | * Release an RPC server buffer | |
592 | */ | |
593 | static void | |
594 | svc_release_buffer(struct svc_rqst *rqstp) | |
595 | { | |
50c8bb13 CL |
596 | unsigned int i; |
597 | ||
598 | for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++) | |
44524359 N |
599 | if (rqstp->rq_pages[i]) |
600 | put_page(rqstp->rq_pages[i]); | |
1da177e4 LT |
601 | } |
602 | ||
0113ab34 | 603 | struct svc_rqst * |
1b6dc1df | 604 | svc_rqst_alloc(struct svc_serv *serv, struct svc_pool *pool, int node) |
1da177e4 LT |
605 | { |
606 | struct svc_rqst *rqstp; | |
1da177e4 | 607 | |
11fd165c | 608 | rqstp = kzalloc_node(sizeof(*rqstp), GFP_KERNEL, node); |
1da177e4 | 609 | if (!rqstp) |
1b6dc1df | 610 | return rqstp; |
1da177e4 | 611 | |
b1691bc0 JL |
612 | __set_bit(RQ_BUSY, &rqstp->rq_flags); |
613 | spin_lock_init(&rqstp->rq_lock); | |
614 | rqstp->rq_server = serv; | |
615 | rqstp->rq_pool = pool; | |
bfd24160 | 616 | |
5191955d CL |
617 | rqstp->rq_scratch_page = alloc_pages_node(node, GFP_KERNEL, 0); |
618 | if (!rqstp->rq_scratch_page) | |
619 | goto out_enomem; | |
620 | ||
11fd165c | 621 | rqstp->rq_argp = kmalloc_node(serv->sv_xdrsize, GFP_KERNEL, node); |
0113ab34 | 622 | if (!rqstp->rq_argp) |
1b6dc1df | 623 | goto out_enomem; |
0113ab34 | 624 | |
11fd165c | 625 | rqstp->rq_resp = kmalloc_node(serv->sv_xdrsize, GFP_KERNEL, node); |
0113ab34 | 626 | if (!rqstp->rq_resp) |
1b6dc1df | 627 | goto out_enomem; |
0113ab34 | 628 | |
11fd165c | 629 | if (!svc_init_buffer(rqstp, serv->sv_max_mesg, node)) |
1b6dc1df | 630 | goto out_enomem; |
0113ab34 JL |
631 | |
632 | return rqstp; | |
0113ab34 | 633 | out_enomem: |
1b6dc1df JL |
634 | svc_rqst_free(rqstp); |
635 | return NULL; | |
636 | } | |
637 | EXPORT_SYMBOL_GPL(svc_rqst_alloc); | |
638 | ||
639 | struct svc_rqst * | |
640 | svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool, int node) | |
641 | { | |
642 | struct svc_rqst *rqstp; | |
643 | ||
644 | rqstp = svc_rqst_alloc(serv, pool, node); | |
645 | if (!rqstp) | |
646 | return ERR_PTR(-ENOMEM); | |
647 | ||
648 | serv->sv_nrthreads++; | |
649 | spin_lock_bh(&pool->sp_lock); | |
650 | pool->sp_nrthreads++; | |
651 | list_add_rcu(&rqstp->rq_all, &pool->sp_all_threads); | |
652 | spin_unlock_bh(&pool->sp_lock); | |
653 | return rqstp; | |
0113ab34 | 654 | } |
24c3767e | 655 | EXPORT_SYMBOL_GPL(svc_prepare_thread); |
0113ab34 | 656 | |
a7455442 GB |
657 | /* |
658 | * Choose a pool in which to create a new thread, for svc_set_num_threads | |
659 | */ | |
660 | static inline struct svc_pool * | |
661 | choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) | |
662 | { | |
663 | if (pool != NULL) | |
664 | return pool; | |
665 | ||
cca5172a | 666 | return &serv->sv_pools[(*state)++ % serv->sv_nrpools]; |
a7455442 GB |
667 | } |
668 | ||
669 | /* | |
670 | * Choose a thread to kill, for svc_set_num_threads | |
671 | */ | |
672 | static inline struct task_struct * | |
673 | choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state) | |
674 | { | |
675 | unsigned int i; | |
676 | struct task_struct *task = NULL; | |
677 | ||
678 | if (pool != NULL) { | |
679 | spin_lock_bh(&pool->sp_lock); | |
680 | } else { | |
681 | /* choose a pool in round-robin fashion */ | |
cca5172a YH |
682 | for (i = 0; i < serv->sv_nrpools; i++) { |
683 | pool = &serv->sv_pools[--(*state) % serv->sv_nrpools]; | |
a7455442 | 684 | spin_lock_bh(&pool->sp_lock); |
cca5172a YH |
685 | if (!list_empty(&pool->sp_all_threads)) |
686 | goto found_pool; | |
a7455442 | 687 | spin_unlock_bh(&pool->sp_lock); |
cca5172a | 688 | } |
a7455442 GB |
689 | return NULL; |
690 | } | |
691 | ||
692 | found_pool: | |
693 | if (!list_empty(&pool->sp_all_threads)) { | |
694 | struct svc_rqst *rqstp; | |
695 | ||
696 | /* | |
697 | * Remove from the pool->sp_all_threads list | |
698 | * so we don't try to kill it again. | |
699 | */ | |
700 | rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all); | |
81244386 JL |
701 | set_bit(RQ_VICTIM, &rqstp->rq_flags); |
702 | list_del_rcu(&rqstp->rq_all); | |
a7455442 | 703 | task = rqstp->rq_task; |
cca5172a | 704 | } |
a7455442 GB |
705 | spin_unlock_bh(&pool->sp_lock); |
706 | ||
707 | return task; | |
708 | } | |
709 | ||
9e0d8768 TM |
710 | /* create new threads */ |
711 | static int | |
712 | svc_start_kthreads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) | |
a7455442 | 713 | { |
9867d76c JL |
714 | struct svc_rqst *rqstp; |
715 | struct task_struct *task; | |
716 | struct svc_pool *chosen_pool; | |
a7455442 | 717 | unsigned int state = serv->sv_nrthreads-1; |
11fd165c | 718 | int node; |
a7455442 | 719 | |
9e0d8768 | 720 | do { |
a7455442 | 721 | nrservs--; |
9867d76c JL |
722 | chosen_pool = choose_pool(serv, pool, &state); |
723 | ||
11fd165c ED |
724 | node = svc_pool_map_get_node(chosen_pool->sp_id); |
725 | rqstp = svc_prepare_thread(serv, chosen_pool, node); | |
9e0d8768 TM |
726 | if (IS_ERR(rqstp)) |
727 | return PTR_ERR(rqstp); | |
9867d76c | 728 | |
758f62ff | 729 | __module_get(serv->sv_ops->svo_module); |
c369014f | 730 | task = kthread_create_on_node(serv->sv_ops->svo_function, rqstp, |
f170168b | 731 | node, "%s", serv->sv_name); |
9867d76c | 732 | if (IS_ERR(task)) { |
758f62ff | 733 | module_put(serv->sv_ops->svo_module); |
9867d76c | 734 | svc_exit_thread(rqstp); |
9e0d8768 | 735 | return PTR_ERR(task); |
a7455442 | 736 | } |
9867d76c JL |
737 | |
738 | rqstp->rq_task = task; | |
739 | if (serv->sv_nrpools > 1) | |
740 | svc_pool_map_set_cpumask(task, chosen_pool->sp_id); | |
741 | ||
742 | svc_sock_update_bufs(serv); | |
743 | wake_up_process(task); | |
9e0d8768 TM |
744 | } while (nrservs > 0); |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
749 | ||
750 | /* destroy old threads */ | |
751 | static int | |
752 | svc_signal_kthreads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) | |
753 | { | |
754 | struct task_struct *task; | |
755 | unsigned int state = serv->sv_nrthreads-1; | |
756 | ||
a7455442 | 757 | /* destroy old threads */ |
9e0d8768 TM |
758 | do { |
759 | task = choose_victim(serv, pool, &state); | |
760 | if (task == NULL) | |
761 | break; | |
a75c5d01 | 762 | send_sig(SIGINT, task, 1); |
a7455442 | 763 | nrservs++; |
9e0d8768 TM |
764 | } while (nrservs < 0); |
765 | ||
766 | return 0; | |
767 | } | |
768 | ||
769 | /* | |
770 | * Create or destroy enough new threads to make the number | |
771 | * of threads the given number. If `pool' is non-NULL, applies | |
772 | * only to threads in that pool, otherwise round-robins between | |
773 | * all pools. Caller must ensure that mutual exclusion between this and | |
774 | * server startup or shutdown. | |
775 | * | |
776 | * Destroying threads relies on the service threads filling in | |
777 | * rqstp->rq_task, which only the nfs ones do. Assumes the serv | |
778 | * has been created using svc_create_pooled(). | |
779 | * | |
780 | * Based on code that used to be in nfsd_svc() but tweaked | |
781 | * to be pool-aware. | |
782 | */ | |
783 | int | |
784 | svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) | |
785 | { | |
786 | if (pool == NULL) { | |
787 | /* The -1 assumes caller has done a svc_get() */ | |
788 | nrservs -= (serv->sv_nrthreads-1); | |
789 | } else { | |
790 | spin_lock_bh(&pool->sp_lock); | |
791 | nrservs -= pool->sp_nrthreads; | |
792 | spin_unlock_bh(&pool->sp_lock); | |
a7455442 GB |
793 | } |
794 | ||
9e0d8768 TM |
795 | if (nrservs > 0) |
796 | return svc_start_kthreads(serv, pool, nrservs); | |
797 | if (nrservs < 0) | |
798 | return svc_signal_kthreads(serv, pool, nrservs); | |
799 | return 0; | |
a7455442 | 800 | } |
24c3767e | 801 | EXPORT_SYMBOL_GPL(svc_set_num_threads); |
a7455442 | 802 | |
ed6473dd TM |
803 | /* destroy old threads */ |
804 | static int | |
805 | svc_stop_kthreads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) | |
806 | { | |
807 | struct task_struct *task; | |
808 | unsigned int state = serv->sv_nrthreads-1; | |
809 | ||
810 | /* destroy old threads */ | |
811 | do { | |
812 | task = choose_victim(serv, pool, &state); | |
813 | if (task == NULL) | |
814 | break; | |
815 | kthread_stop(task); | |
816 | nrservs++; | |
817 | } while (nrservs < 0); | |
818 | return 0; | |
819 | } | |
820 | ||
821 | int | |
822 | svc_set_num_threads_sync(struct svc_serv *serv, struct svc_pool *pool, int nrservs) | |
823 | { | |
824 | if (pool == NULL) { | |
825 | /* The -1 assumes caller has done a svc_get() */ | |
826 | nrservs -= (serv->sv_nrthreads-1); | |
827 | } else { | |
828 | spin_lock_bh(&pool->sp_lock); | |
829 | nrservs -= pool->sp_nrthreads; | |
830 | spin_unlock_bh(&pool->sp_lock); | |
831 | } | |
832 | ||
833 | if (nrservs > 0) | |
834 | return svc_start_kthreads(serv, pool, nrservs); | |
835 | if (nrservs < 0) | |
836 | return svc_stop_kthreads(serv, pool, nrservs); | |
837 | return 0; | |
838 | } | |
839 | EXPORT_SYMBOL_GPL(svc_set_num_threads_sync); | |
840 | ||
3262c816 | 841 | /* |
3c519914 JL |
842 | * Called from a server thread as it's exiting. Caller must hold the "service |
843 | * mutex" for the service. | |
1da177e4 LT |
844 | */ |
845 | void | |
1b6dc1df | 846 | svc_rqst_free(struct svc_rqst *rqstp) |
1da177e4 | 847 | { |
1da177e4 | 848 | svc_release_buffer(rqstp); |
b9f83ffa YW |
849 | if (rqstp->rq_scratch_page) |
850 | put_page(rqstp->rq_scratch_page); | |
a51482bd JJ |
851 | kfree(rqstp->rq_resp); |
852 | kfree(rqstp->rq_argp); | |
853 | kfree(rqstp->rq_auth_data); | |
1b6dc1df JL |
854 | kfree_rcu(rqstp, rq_rcu_head); |
855 | } | |
856 | EXPORT_SYMBOL_GPL(svc_rqst_free); | |
857 | ||
858 | void | |
859 | svc_exit_thread(struct svc_rqst *rqstp) | |
860 | { | |
861 | struct svc_serv *serv = rqstp->rq_server; | |
862 | struct svc_pool *pool = rqstp->rq_pool; | |
3262c816 GB |
863 | |
864 | spin_lock_bh(&pool->sp_lock); | |
865 | pool->sp_nrthreads--; | |
81244386 JL |
866 | if (!test_and_set_bit(RQ_VICTIM, &rqstp->rq_flags)) |
867 | list_del_rcu(&rqstp->rq_all); | |
3262c816 GB |
868 | spin_unlock_bh(&pool->sp_lock); |
869 | ||
1b6dc1df | 870 | svc_rqst_free(rqstp); |
1da177e4 LT |
871 | |
872 | /* Release the server */ | |
873 | if (serv) | |
874 | svc_destroy(serv); | |
875 | } | |
24c3767e | 876 | EXPORT_SYMBOL_GPL(svc_exit_thread); |
1da177e4 LT |
877 | |
878 | /* | |
2c7eb0b2 CL |
879 | * Register an "inet" protocol family netid with the local |
880 | * rpcbind daemon via an rpcbind v4 SET request. | |
a26cfad6 | 881 | * |
2c7eb0b2 CL |
882 | * No netconfig infrastructure is available in the kernel, so |
883 | * we map IP_ protocol numbers to netids by hand. | |
a26cfad6 | 884 | * |
2c7eb0b2 CL |
885 | * Returns zero on success; a negative errno value is returned |
886 | * if any error occurs. | |
1da177e4 | 887 | */ |
5247fab5 SK |
888 | static int __svc_rpcb_register4(struct net *net, const u32 program, |
889 | const u32 version, | |
2c7eb0b2 CL |
890 | const unsigned short protocol, |
891 | const unsigned short port) | |
a26cfad6 | 892 | { |
cadc0fa5 | 893 | const struct sockaddr_in sin = { |
a26cfad6 CL |
894 | .sin_family = AF_INET, |
895 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
896 | .sin_port = htons(port), | |
897 | }; | |
cadc0fa5 CL |
898 | const char *netid; |
899 | int error; | |
2c7eb0b2 CL |
900 | |
901 | switch (protocol) { | |
902 | case IPPROTO_UDP: | |
903 | netid = RPCBIND_NETID_UDP; | |
904 | break; | |
905 | case IPPROTO_TCP: | |
906 | netid = RPCBIND_NETID_TCP; | |
907 | break; | |
908 | default: | |
ba5c35e0 | 909 | return -ENOPROTOOPT; |
2c7eb0b2 CL |
910 | } |
911 | ||
5247fab5 | 912 | error = rpcb_v4_register(net, program, version, |
cadc0fa5 CL |
913 | (const struct sockaddr *)&sin, netid); |
914 | ||
915 | /* | |
916 | * User space didn't support rpcbind v4, so retry this | |
917 | * registration request with the legacy rpcbind v2 protocol. | |
918 | */ | |
919 | if (error == -EPROTONOSUPPORT) | |
5247fab5 | 920 | error = rpcb_register(net, program, version, protocol, port); |
cadc0fa5 CL |
921 | |
922 | return error; | |
2c7eb0b2 CL |
923 | } |
924 | ||
dfd56b8b | 925 | #if IS_ENABLED(CONFIG_IPV6) |
2c7eb0b2 CL |
926 | /* |
927 | * Register an "inet6" protocol family netid with the local | |
928 | * rpcbind daemon via an rpcbind v4 SET request. | |
929 | * | |
930 | * No netconfig infrastructure is available in the kernel, so | |
931 | * we map IP_ protocol numbers to netids by hand. | |
932 | * | |
933 | * Returns zero on success; a negative errno value is returned | |
934 | * if any error occurs. | |
935 | */ | |
5247fab5 SK |
936 | static int __svc_rpcb_register6(struct net *net, const u32 program, |
937 | const u32 version, | |
2c7eb0b2 CL |
938 | const unsigned short protocol, |
939 | const unsigned short port) | |
940 | { | |
cadc0fa5 | 941 | const struct sockaddr_in6 sin6 = { |
a26cfad6 CL |
942 | .sin6_family = AF_INET6, |
943 | .sin6_addr = IN6ADDR_ANY_INIT, | |
944 | .sin6_port = htons(port), | |
945 | }; | |
cadc0fa5 CL |
946 | const char *netid; |
947 | int error; | |
a26cfad6 | 948 | |
2c7eb0b2 CL |
949 | switch (protocol) { |
950 | case IPPROTO_UDP: | |
951 | netid = RPCBIND_NETID_UDP6; | |
a26cfad6 | 952 | break; |
2c7eb0b2 | 953 | case IPPROTO_TCP: |
a26cfad6 | 954 | netid = RPCBIND_NETID_TCP6; |
a26cfad6 CL |
955 | break; |
956 | default: | |
ba5c35e0 | 957 | return -ENOPROTOOPT; |
2c7eb0b2 CL |
958 | } |
959 | ||
5247fab5 | 960 | error = rpcb_v4_register(net, program, version, |
cadc0fa5 CL |
961 | (const struct sockaddr *)&sin6, netid); |
962 | ||
963 | /* | |
964 | * User space didn't support rpcbind version 4, so we won't | |
965 | * use a PF_INET6 listener. | |
966 | */ | |
967 | if (error == -EPROTONOSUPPORT) | |
968 | error = -EAFNOSUPPORT; | |
969 | ||
970 | return error; | |
2c7eb0b2 | 971 | } |
dfd56b8b | 972 | #endif /* IS_ENABLED(CONFIG_IPV6) */ |
2c7eb0b2 CL |
973 | |
974 | /* | |
975 | * Register a kernel RPC service via rpcbind version 4. | |
976 | * | |
977 | * Returns zero on success; a negative errno value is returned | |
978 | * if any error occurs. | |
979 | */ | |
5247fab5 | 980 | static int __svc_register(struct net *net, const char *progname, |
363f724c | 981 | const u32 program, const u32 version, |
4b62e58c | 982 | const int family, |
2c7eb0b2 CL |
983 | const unsigned short protocol, |
984 | const unsigned short port) | |
985 | { | |
363f724c | 986 | int error = -EAFNOSUPPORT; |
2c7eb0b2 CL |
987 | |
988 | switch (family) { | |
4b62e58c | 989 | case PF_INET: |
5247fab5 | 990 | error = __svc_rpcb_register4(net, program, version, |
2c7eb0b2 | 991 | protocol, port); |
cadc0fa5 | 992 | break; |
dfd56b8b | 993 | #if IS_ENABLED(CONFIG_IPV6) |
4b62e58c | 994 | case PF_INET6: |
5247fab5 | 995 | error = __svc_rpcb_register6(net, program, version, |
2c7eb0b2 | 996 | protocol, port); |
dfd56b8b | 997 | #endif |
a26cfad6 CL |
998 | } |
999 | ||
b4af5932 | 1000 | trace_svc_register(progname, version, protocol, port, family, error); |
363f724c | 1001 | return error; |
a26cfad6 | 1002 | } |
2c7eb0b2 | 1003 | |
642ee6b2 TM |
1004 | int svc_rpcbind_set_version(struct net *net, |
1005 | const struct svc_program *progp, | |
1006 | u32 version, int family, | |
1007 | unsigned short proto, | |
1008 | unsigned short port) | |
1009 | { | |
642ee6b2 TM |
1010 | return __svc_register(net, progp->pg_name, progp->pg_prog, |
1011 | version, family, proto, port); | |
1012 | ||
1013 | } | |
1014 | EXPORT_SYMBOL_GPL(svc_rpcbind_set_version); | |
1015 | ||
1016 | int svc_generic_rpcbind_set(struct net *net, | |
1017 | const struct svc_program *progp, | |
1018 | u32 version, int family, | |
1019 | unsigned short proto, | |
1020 | unsigned short port) | |
1021 | { | |
1022 | const struct svc_version *vers = progp->pg_vers[version]; | |
1023 | int error; | |
1024 | ||
1025 | if (vers == NULL) | |
1026 | return 0; | |
1027 | ||
1028 | if (vers->vs_hidden) { | |
b4af5932 CL |
1029 | trace_svc_noregister(progp->pg_name, version, proto, |
1030 | port, family, 0); | |
642ee6b2 TM |
1031 | return 0; |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * Don't register a UDP port if we need congestion | |
1036 | * control. | |
1037 | */ | |
1038 | if (vers->vs_need_cong_ctrl && proto == IPPROTO_UDP) | |
1039 | return 0; | |
1040 | ||
1041 | error = svc_rpcbind_set_version(net, progp, version, | |
1042 | family, proto, port); | |
1043 | ||
1044 | return (vers->vs_rpcb_optnl) ? 0 : error; | |
1045 | } | |
1046 | EXPORT_SYMBOL_GPL(svc_generic_rpcbind_set); | |
1047 | ||
a26cfad6 CL |
1048 | /** |
1049 | * svc_register - register an RPC service with the local portmapper | |
1050 | * @serv: svc_serv struct for the service to register | |
5247fab5 | 1051 | * @net: net namespace for the service to register |
4b62e58c | 1052 | * @family: protocol family of service's listener socket |
a26cfad6 CL |
1053 | * @proto: transport protocol number to advertise |
1054 | * @port: port to advertise | |
1055 | * | |
4b62e58c | 1056 | * Service is registered for any address in the passed-in protocol family |
a26cfad6 | 1057 | */ |
5247fab5 SK |
1058 | int svc_register(const struct svc_serv *serv, struct net *net, |
1059 | const int family, const unsigned short proto, | |
1060 | const unsigned short port) | |
1da177e4 LT |
1061 | { |
1062 | struct svc_program *progp; | |
ea339d46 | 1063 | unsigned int i; |
14aeb211 | 1064 | int error = 0; |
1da177e4 | 1065 | |
0af39507 WAA |
1066 | WARN_ON_ONCE(proto == 0 && port == 0); |
1067 | if (proto == 0 && port == 0) | |
1068 | return -EINVAL; | |
1da177e4 | 1069 | |
bc5fea42 OK |
1070 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { |
1071 | for (i = 0; i < progp->pg_nvers; i++) { | |
7e55b59b | 1072 | |
642ee6b2 TM |
1073 | error = progp->pg_rpcbind_set(net, progp, i, |
1074 | family, proto, port); | |
7e55b59b KM |
1075 | if (error < 0) { |
1076 | printk(KERN_WARNING "svc: failed to register " | |
1077 | "%sv%u RPC service (errno %d).\n", | |
1078 | progp->pg_name, i, -error); | |
bc5fea42 | 1079 | break; |
7e55b59b | 1080 | } |
1da177e4 LT |
1081 | } |
1082 | } | |
1083 | ||
7252d575 CL |
1084 | return error; |
1085 | } | |
1086 | ||
d5a8620f CL |
1087 | /* |
1088 | * If user space is running rpcbind, it should take the v4 UNSET | |
1089 | * and clear everything for this [program, version]. If user space | |
1090 | * is running portmap, it will reject the v4 UNSET, but won't have | |
1091 | * any "inet6" entries anyway. So a PMAP_UNSET should be sufficient | |
1092 | * in this case to clear all existing entries for [program, version]. | |
1093 | */ | |
5247fab5 | 1094 | static void __svc_unregister(struct net *net, const u32 program, const u32 version, |
f6fb3f6f CL |
1095 | const char *progname) |
1096 | { | |
f6fb3f6f CL |
1097 | int error; |
1098 | ||
5247fab5 | 1099 | error = rpcb_v4_register(net, program, version, NULL, ""); |
f6fb3f6f | 1100 | |
d5a8620f CL |
1101 | /* |
1102 | * User space didn't support rpcbind v4, so retry this | |
1103 | * request with the legacy rpcbind v2 protocol. | |
1104 | */ | |
1105 | if (error == -EPROTONOSUPPORT) | |
5247fab5 | 1106 | error = rpcb_register(net, program, version, 0, 0); |
f6fb3f6f | 1107 | |
b4af5932 | 1108 | trace_svc_unregister(progname, version, error); |
f6fb3f6f CL |
1109 | } |
1110 | ||
7252d575 | 1111 | /* |
f6fb3f6f CL |
1112 | * All netids, bind addresses and ports registered for [program, version] |
1113 | * are removed from the local rpcbind database (if the service is not | |
1114 | * hidden) to make way for a new instance of the service. | |
7252d575 | 1115 | * |
f6fb3f6f CL |
1116 | * The result of unregistration is reported via dprintk for those who want |
1117 | * verification of the result, but is otherwise not important. | |
7252d575 | 1118 | */ |
5247fab5 | 1119 | static void svc_unregister(const struct svc_serv *serv, struct net *net) |
7252d575 CL |
1120 | { |
1121 | struct svc_program *progp; | |
1122 | unsigned long flags; | |
1123 | unsigned int i; | |
7252d575 CL |
1124 | |
1125 | clear_thread_flag(TIF_SIGPENDING); | |
1126 | ||
1127 | for (progp = serv->sv_program; progp; progp = progp->pg_next) { | |
1128 | for (i = 0; i < progp->pg_nvers; i++) { | |
1129 | if (progp->pg_vers[i] == NULL) | |
1130 | continue; | |
1131 | if (progp->pg_vers[i]->vs_hidden) | |
1132 | continue; | |
5247fab5 | 1133 | __svc_unregister(net, progp->pg_prog, i, progp->pg_name); |
7252d575 | 1134 | } |
1da177e4 LT |
1135 | } |
1136 | ||
7252d575 CL |
1137 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
1138 | recalc_sigpending(); | |
1139 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
1da177e4 LT |
1140 | } |
1141 | ||
354ecbb9 | 1142 | /* |
7032a3dd | 1143 | * dprintk the given error with the address of the client that caused it. |
354ecbb9 | 1144 | */ |
f895b252 | 1145 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
b9075fa9 | 1146 | static __printf(2, 3) |
e87cc472 | 1147 | void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) |
354ecbb9 | 1148 | { |
e87cc472 | 1149 | struct va_format vaf; |
354ecbb9 | 1150 | va_list args; |
354ecbb9 DDAG |
1151 | char buf[RPC_MAX_ADDRBUFLEN]; |
1152 | ||
e87cc472 | 1153 | va_start(args, fmt); |
354ecbb9 | 1154 | |
e87cc472 JP |
1155 | vaf.fmt = fmt; |
1156 | vaf.va = &args; | |
354ecbb9 | 1157 | |
7032a3dd | 1158 | dprintk("svc: %s: %pV", svc_print_addr(rqstp, buf, sizeof(buf)), &vaf); |
354ecbb9 | 1159 | |
e87cc472 | 1160 | va_end(args); |
354ecbb9 | 1161 | } |
624ab464 BF |
1162 | #else |
1163 | static __printf(2,3) void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) {} | |
1164 | #endif | |
354ecbb9 | 1165 | |
83dd59a0 TM |
1166 | __be32 |
1167 | svc_return_autherr(struct svc_rqst *rqstp, __be32 auth_err) | |
1168 | { | |
1169 | set_bit(RQ_AUTHERR, &rqstp->rq_flags); | |
1170 | return auth_err; | |
1171 | } | |
1172 | EXPORT_SYMBOL_GPL(svc_return_autherr); | |
1173 | ||
1174 | static __be32 | |
1175 | svc_get_autherr(struct svc_rqst *rqstp, __be32 *statp) | |
1176 | { | |
1177 | if (test_and_clear_bit(RQ_AUTHERR, &rqstp->rq_flags)) | |
1178 | return *statp; | |
1179 | return rpc_auth_ok; | |
1180 | } | |
1181 | ||
4532608d TM |
1182 | static int |
1183 | svc_generic_dispatch(struct svc_rqst *rqstp, __be32 *statp) | |
1184 | { | |
1185 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1186 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1187 | const struct svc_procedure *procp = rqstp->rq_procinfo; | |
1188 | ||
1189 | /* | |
1190 | * Decode arguments | |
1191 | * XXX: why do we ignore the return value? | |
1192 | */ | |
1193 | if (procp->pc_decode && | |
1194 | !procp->pc_decode(rqstp, argv->iov_base)) { | |
1195 | *statp = rpc_garbage_args; | |
1196 | return 1; | |
1197 | } | |
1198 | ||
1199 | *statp = procp->pc_func(rqstp); | |
1200 | ||
1201 | if (*statp == rpc_drop_reply || | |
1202 | test_bit(RQ_DROPME, &rqstp->rq_flags)) | |
1203 | return 0; | |
1204 | ||
1205 | if (test_bit(RQ_AUTHERR, &rqstp->rq_flags)) | |
1206 | return 1; | |
1207 | ||
1208 | if (*statp != rpc_success) | |
1209 | return 1; | |
1210 | ||
1211 | /* Encode reply */ | |
1212 | if (procp->pc_encode && | |
1213 | !procp->pc_encode(rqstp, resv->iov_base + resv->iov_len)) { | |
1214 | dprintk("svc: failed to encode reply\n"); | |
1215 | /* serv->sv_stats->rpcsystemerr++; */ | |
1216 | *statp = rpc_system_err; | |
1217 | } | |
1218 | return 1; | |
1219 | } | |
1220 | ||
8e5b6773 TM |
1221 | __be32 |
1222 | svc_generic_init_request(struct svc_rqst *rqstp, | |
1223 | const struct svc_program *progp, | |
1224 | struct svc_process_info *ret) | |
1225 | { | |
1226 | const struct svc_version *versp = NULL; /* compiler food */ | |
1227 | const struct svc_procedure *procp = NULL; | |
1228 | ||
1229 | if (rqstp->rq_vers >= progp->pg_nvers ) | |
1230 | goto err_bad_vers; | |
e41f9efb CIK |
1231 | versp = progp->pg_vers[rqstp->rq_vers]; |
1232 | if (!versp) | |
8e5b6773 TM |
1233 | goto err_bad_vers; |
1234 | ||
1235 | /* | |
1236 | * Some protocol versions (namely NFSv4) require some form of | |
1237 | * congestion control. (See RFC 7530 section 3.1 paragraph 2) | |
1238 | * In other words, UDP is not allowed. We mark those when setting | |
1239 | * up the svc_xprt, and verify that here. | |
1240 | * | |
1241 | * The spec is not very clear about what error should be returned | |
1242 | * when someone tries to access a server that is listening on UDP | |
1243 | * for lower versions. RPC_PROG_MISMATCH seems to be the closest | |
1244 | * fit. | |
1245 | */ | |
1246 | if (versp->vs_need_cong_ctrl && rqstp->rq_xprt && | |
1247 | !test_bit(XPT_CONG_CTRL, &rqstp->rq_xprt->xpt_flags)) | |
1248 | goto err_bad_vers; | |
1249 | ||
1250 | if (rqstp->rq_proc >= versp->vs_nproc) | |
1251 | goto err_bad_proc; | |
1252 | rqstp->rq_procinfo = procp = &versp->vs_proc[rqstp->rq_proc]; | |
1253 | if (!procp) | |
1254 | goto err_bad_proc; | |
1255 | ||
1256 | /* Initialize storage for argp and resp */ | |
1257 | memset(rqstp->rq_argp, 0, procp->pc_argsize); | |
1258 | memset(rqstp->rq_resp, 0, procp->pc_ressize); | |
1259 | ||
1260 | /* Bump per-procedure stats counter */ | |
1261 | versp->vs_count[rqstp->rq_proc]++; | |
1262 | ||
1263 | ret->dispatch = versp->vs_dispatch; | |
1264 | return rpc_success; | |
1265 | err_bad_vers: | |
1266 | ret->mismatch.lovers = progp->pg_lovers; | |
1267 | ret->mismatch.hivers = progp->pg_hivers; | |
1268 | return rpc_prog_mismatch; | |
1269 | err_bad_proc: | |
1270 | return rpc_proc_unavail; | |
1271 | } | |
1272 | EXPORT_SYMBOL_GPL(svc_generic_init_request); | |
1273 | ||
1da177e4 | 1274 | /* |
1cad7ea6 | 1275 | * Common routine for processing the RPC request. |
1da177e4 | 1276 | */ |
1cad7ea6 RL |
1277 | static int |
1278 | svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) | |
1da177e4 LT |
1279 | { |
1280 | struct svc_program *progp; | |
860bda29 | 1281 | const struct svc_procedure *procp = NULL; |
6fb2b47f | 1282 | struct svc_serv *serv = rqstp->rq_server; |
8e5b6773 | 1283 | struct svc_process_info process; |
d8ed029d | 1284 | __be32 *statp; |
8e5b6773 | 1285 | u32 prog, vers; |
d8ed029d | 1286 | __be32 auth_stat, rpc_stat; |
1da177e4 | 1287 | int auth_res; |
8f8e05c5 | 1288 | __be32 *reply_statp; |
1da177e4 LT |
1289 | |
1290 | rpc_stat = rpc_success; | |
1291 | ||
1292 | if (argv->iov_len < 6*4) | |
1293 | goto err_short_len; | |
1294 | ||
06eb8a56 | 1295 | /* Will be turned off by GSS integrity and privacy services */ |
779fb0f3 | 1296 | set_bit(RQ_SPLICE_OK, &rqstp->rq_flags); |
2f425878 | 1297 | /* Will be turned off only when NFSv4 Sessions are used */ |
30660e04 | 1298 | set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags); |
78b65eb3 | 1299 | clear_bit(RQ_DROPME, &rqstp->rq_flags); |
e831fe65 | 1300 | |
1da177e4 LT |
1301 | svc_putu32(resv, rqstp->rq_xid); |
1302 | ||
76994313 | 1303 | vers = svc_getnl(argv); |
1da177e4 LT |
1304 | |
1305 | /* First words of reply: */ | |
76994313 | 1306 | svc_putnl(resv, 1); /* REPLY */ |
1da177e4 | 1307 | |
1da177e4 LT |
1308 | if (vers != 2) /* RPC version number */ |
1309 | goto err_bad_rpc; | |
1310 | ||
1311 | /* Save position in case we later decide to reject: */ | |
8f8e05c5 | 1312 | reply_statp = resv->iov_base + resv->iov_len; |
1da177e4 | 1313 | |
76994313 | 1314 | svc_putnl(resv, 0); /* ACCEPT */ |
1da177e4 | 1315 | |
76994313 | 1316 | rqstp->rq_prog = prog = svc_getnl(argv); /* program number */ |
8e5b6773 TM |
1317 | rqstp->rq_vers = svc_getnl(argv); /* version number */ |
1318 | rqstp->rq_proc = svc_getnl(argv); /* procedure number */ | |
1da177e4 | 1319 | |
80d188a6 N |
1320 | for (progp = serv->sv_program; progp; progp = progp->pg_next) |
1321 | if (prog == progp->pg_prog) | |
1322 | break; | |
1323 | ||
1da177e4 LT |
1324 | /* |
1325 | * Decode auth data, and add verifier to reply buffer. | |
1326 | * We do this before anything else in order to get a decent | |
1327 | * auth verifier. | |
1328 | */ | |
1329 | auth_res = svc_authenticate(rqstp, &auth_stat); | |
1330 | /* Also give the program a chance to reject this call: */ | |
80d188a6 | 1331 | if (auth_res == SVC_OK && progp) { |
1da177e4 LT |
1332 | auth_stat = rpc_autherr_badcred; |
1333 | auth_res = progp->pg_authenticate(rqstp); | |
1334 | } | |
ff27e9f7 CL |
1335 | if (auth_res != SVC_OK) |
1336 | trace_svc_authenticate(rqstp, auth_res, auth_stat); | |
1da177e4 LT |
1337 | switch (auth_res) { |
1338 | case SVC_OK: | |
1339 | break; | |
1340 | case SVC_GARBAGE: | |
dd35210e | 1341 | goto err_garbage; |
1da177e4 LT |
1342 | case SVC_SYSERR: |
1343 | rpc_stat = rpc_system_err; | |
1344 | goto err_bad; | |
1345 | case SVC_DENIED: | |
1346 | goto err_bad_auth; | |
1ebede86 | 1347 | case SVC_CLOSE: |
4d712ef1 | 1348 | goto close; |
1da177e4 LT |
1349 | case SVC_DROP: |
1350 | goto dropit; | |
1351 | case SVC_COMPLETE: | |
1352 | goto sendit; | |
1353 | } | |
80d188a6 | 1354 | |
9ba02638 | 1355 | if (progp == NULL) |
1da177e4 LT |
1356 | goto err_bad_prog; |
1357 | ||
8e5b6773 TM |
1358 | rpc_stat = progp->pg_init_request(rqstp, progp, &process); |
1359 | switch (rpc_stat) { | |
1360 | case rpc_success: | |
1361 | break; | |
1362 | case rpc_prog_unavail: | |
1363 | goto err_bad_prog; | |
1364 | case rpc_prog_mismatch: | |
5283b03e | 1365 | goto err_bad_vers; |
8e5b6773 TM |
1366 | case rpc_proc_unavail: |
1367 | goto err_bad_proc; | |
1368 | } | |
5283b03e | 1369 | |
8e5b6773 TM |
1370 | procp = rqstp->rq_procinfo; |
1371 | /* Should this check go into the dispatcher? */ | |
1372 | if (!procp || !procp->pc_func) | |
1da177e4 | 1373 | goto err_bad_proc; |
1da177e4 LT |
1374 | |
1375 | /* Syntactic check complete */ | |
1376 | serv->sv_stats->rpccnt++; | |
0b9547bf | 1377 | trace_svc_process(rqstp, progp->pg_name); |
1da177e4 LT |
1378 | |
1379 | /* Build the reply header. */ | |
1380 | statp = resv->iov_base +resv->iov_len; | |
76994313 | 1381 | svc_putnl(resv, RPC_SUCCESS); |
1da177e4 | 1382 | |
cca5172a | 1383 | /* un-reserve some of the out-queue now that we have a |
1da177e4 LT |
1384 | * better idea of reply size |
1385 | */ | |
1386 | if (procp->pc_xdrressize) | |
cd123012 | 1387 | svc_reserve_auth(rqstp, procp->pc_xdrressize<<2); |
1da177e4 LT |
1388 | |
1389 | /* Call the function that processes the request. */ | |
8e5b6773 | 1390 | if (!process.dispatch) { |
4532608d TM |
1391 | if (!svc_generic_dispatch(rqstp, statp)) |
1392 | goto release_dropit; | |
1393 | if (*statp == rpc_garbage_args) | |
1da177e4 | 1394 | goto err_garbage; |
83dd59a0 TM |
1395 | auth_stat = svc_get_autherr(rqstp, statp); |
1396 | if (auth_stat != rpc_auth_ok) | |
1397 | goto err_release_bad_auth; | |
1da177e4 LT |
1398 | } else { |
1399 | dprintk("svc: calling dispatcher\n"); | |
4532608d TM |
1400 | if (!process.dispatch(rqstp, statp)) |
1401 | goto release_dropit; /* Release reply info */ | |
1da177e4 LT |
1402 | } |
1403 | ||
1404 | /* Check RPC status result */ | |
1405 | if (*statp != rpc_success) | |
1406 | resv->iov_len = ((void*)statp) - resv->iov_base + 4; | |
1407 | ||
1408 | /* Release reply info */ | |
1409 | if (procp->pc_release) | |
8537488b | 1410 | procp->pc_release(rqstp); |
1da177e4 LT |
1411 | |
1412 | if (procp->pc_encode == NULL) | |
1413 | goto dropit; | |
1414 | ||
1415 | sendit: | |
1416 | if (svc_authorise(rqstp)) | |
f1442d63 | 1417 | goto close_xprt; |
1cad7ea6 | 1418 | return 1; /* Caller can now send it */ |
1da177e4 | 1419 | |
4532608d TM |
1420 | release_dropit: |
1421 | if (procp->pc_release) | |
1422 | procp->pc_release(rqstp); | |
1da177e4 LT |
1423 | dropit: |
1424 | svc_authorise(rqstp); /* doesn't hurt to call this twice */ | |
1425 | dprintk("svc: svc_process dropit\n"); | |
1da177e4 LT |
1426 | return 0; |
1427 | ||
4d712ef1 | 1428 | close: |
f1442d63 DK |
1429 | svc_authorise(rqstp); |
1430 | close_xprt: | |
d4b09acf | 1431 | if (rqstp->rq_xprt && test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags)) |
4d712ef1 CL |
1432 | svc_close_xprt(rqstp->rq_xprt); |
1433 | dprintk("svc: svc_process close\n"); | |
1434 | return 0; | |
1435 | ||
1da177e4 | 1436 | err_short_len: |
5b5e0928 | 1437 | svc_printk(rqstp, "short len %zd, dropping request\n", |
354ecbb9 | 1438 | argv->iov_len); |
f1442d63 | 1439 | goto close_xprt; |
1da177e4 | 1440 | |
1da177e4 LT |
1441 | err_bad_rpc: |
1442 | serv->sv_stats->rpcbadfmt++; | |
76994313 AD |
1443 | svc_putnl(resv, 1); /* REJECT */ |
1444 | svc_putnl(resv, 0); /* RPC_MISMATCH */ | |
1445 | svc_putnl(resv, 2); /* Only RPCv2 supported */ | |
1446 | svc_putnl(resv, 2); | |
1da177e4 LT |
1447 | goto sendit; |
1448 | ||
83dd59a0 TM |
1449 | err_release_bad_auth: |
1450 | if (procp->pc_release) | |
1451 | procp->pc_release(rqstp); | |
1da177e4 LT |
1452 | err_bad_auth: |
1453 | dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat)); | |
1454 | serv->sv_stats->rpcbadauth++; | |
1455 | /* Restore write pointer to location of accept status: */ | |
8f8e05c5 | 1456 | xdr_ressize_check(rqstp, reply_statp); |
76994313 AD |
1457 | svc_putnl(resv, 1); /* REJECT */ |
1458 | svc_putnl(resv, 1); /* AUTH_ERROR */ | |
1459 | svc_putnl(resv, ntohl(auth_stat)); /* status */ | |
1da177e4 LT |
1460 | goto sendit; |
1461 | ||
1462 | err_bad_prog: | |
9ba02638 | 1463 | dprintk("svc: unknown program %d\n", prog); |
1da177e4 | 1464 | serv->sv_stats->rpcbadfmt++; |
76994313 | 1465 | svc_putnl(resv, RPC_PROG_UNAVAIL); |
1da177e4 LT |
1466 | goto sendit; |
1467 | ||
1468 | err_bad_vers: | |
354ecbb9 | 1469 | svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n", |
8e5b6773 | 1470 | rqstp->rq_vers, rqstp->rq_prog, progp->pg_name); |
34e9a63b | 1471 | |
1da177e4 | 1472 | serv->sv_stats->rpcbadfmt++; |
76994313 | 1473 | svc_putnl(resv, RPC_PROG_MISMATCH); |
8e5b6773 TM |
1474 | svc_putnl(resv, process.mismatch.lovers); |
1475 | svc_putnl(resv, process.mismatch.hivers); | |
1da177e4 LT |
1476 | goto sendit; |
1477 | ||
1478 | err_bad_proc: | |
8e5b6773 | 1479 | svc_printk(rqstp, "unknown procedure (%d)\n", rqstp->rq_proc); |
34e9a63b | 1480 | |
1da177e4 | 1481 | serv->sv_stats->rpcbadfmt++; |
76994313 | 1482 | svc_putnl(resv, RPC_PROC_UNAVAIL); |
1da177e4 LT |
1483 | goto sendit; |
1484 | ||
1485 | err_garbage: | |
354ecbb9 | 1486 | svc_printk(rqstp, "failed to decode args\n"); |
34e9a63b | 1487 | |
1da177e4 LT |
1488 | rpc_stat = rpc_garbage_args; |
1489 | err_bad: | |
1490 | serv->sv_stats->rpcbadfmt++; | |
76994313 | 1491 | svc_putnl(resv, ntohl(rpc_stat)); |
1da177e4 LT |
1492 | goto sendit; |
1493 | } | |
7adae489 | 1494 | |
1cad7ea6 RL |
1495 | /* |
1496 | * Process the RPC request. | |
1497 | */ | |
1498 | int | |
1499 | svc_process(struct svc_rqst *rqstp) | |
1500 | { | |
1501 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1502 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1503 | struct svc_serv *serv = rqstp->rq_server; | |
1504 | u32 dir; | |
1cad7ea6 RL |
1505 | |
1506 | /* | |
1507 | * Setup response xdr_buf. | |
1508 | * Initially it has just one page | |
1509 | */ | |
afc59400 | 1510 | rqstp->rq_next_page = &rqstp->rq_respages[1]; |
1cad7ea6 RL |
1511 | resv->iov_base = page_address(rqstp->rq_respages[0]); |
1512 | resv->iov_len = 0; | |
1513 | rqstp->rq_res.pages = rqstp->rq_respages + 1; | |
1514 | rqstp->rq_res.len = 0; | |
1515 | rqstp->rq_res.page_base = 0; | |
1516 | rqstp->rq_res.page_len = 0; | |
1517 | rqstp->rq_res.buflen = PAGE_SIZE; | |
1518 | rqstp->rq_res.tail[0].iov_base = NULL; | |
1519 | rqstp->rq_res.tail[0].iov_len = 0; | |
1520 | ||
1cad7ea6 RL |
1521 | dir = svc_getnl(argv); |
1522 | if (dir != 0) { | |
1523 | /* direction != CALL */ | |
1524 | svc_printk(rqstp, "bad direction %d, dropping request\n", dir); | |
1525 | serv->sv_stats->rpcbadfmt++; | |
860a0d9e | 1526 | goto out_drop; |
1cad7ea6 RL |
1527 | } |
1528 | ||
4b5b3ba1 | 1529 | /* Returns 1 for send, 0 for drop */ |
0b9547bf CL |
1530 | if (likely(svc_process_common(rqstp, argv, resv))) |
1531 | return svc_send(rqstp); | |
860a0d9e | 1532 | |
860a0d9e | 1533 | out_drop: |
860a0d9e JL |
1534 | svc_drop(rqstp); |
1535 | return 0; | |
1cad7ea6 | 1536 | } |
3f87d5d6 | 1537 | EXPORT_SYMBOL_GPL(svc_process); |
1cad7ea6 | 1538 | |
9e00abc3 | 1539 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
4d6bbb62 RL |
1540 | /* |
1541 | * Process a backchannel RPC request that arrived over an existing | |
1542 | * outbound connection | |
1543 | */ | |
1544 | int | |
1545 | bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req, | |
1546 | struct svc_rqst *rqstp) | |
1547 | { | |
1548 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1549 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
632dda83 | 1550 | struct rpc_task *task; |
0d2a970d | 1551 | int proc_error; |
632dda83 CL |
1552 | int error; |
1553 | ||
1554 | dprintk("svc: %s(%p)\n", __func__, req); | |
4d6bbb62 RL |
1555 | |
1556 | /* Build the svc_rqst used by the common processing routine */ | |
1557 | rqstp->rq_xid = req->rq_xid; | |
1558 | rqstp->rq_prot = req->rq_xprt->prot; | |
1559 | rqstp->rq_server = serv; | |
d4b09acf | 1560 | rqstp->rq_bc_net = req->rq_xprt->xprt_net; |
4d6bbb62 RL |
1561 | |
1562 | rqstp->rq_addrlen = sizeof(req->rq_xprt->addr); | |
1563 | memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen); | |
1564 | memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg)); | |
1565 | memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res)); | |
756b9b37 TM |
1566 | |
1567 | /* Adjust the argument buffer length */ | |
38b7631f | 1568 | rqstp->rq_arg.len = req->rq_private_buf.len; |
756b9b37 TM |
1569 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1570 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1571 | rqstp->rq_arg.page_len = 0; | |
1572 | } else if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len + | |
1573 | rqstp->rq_arg.page_len) | |
1574 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - | |
1575 | rqstp->rq_arg.head[0].iov_len; | |
1576 | else | |
1577 | rqstp->rq_arg.len = rqstp->rq_arg.head[0].iov_len + | |
1578 | rqstp->rq_arg.page_len; | |
4d6bbb62 RL |
1579 | |
1580 | /* reset result send buffer "put" position */ | |
1581 | resv->iov_len = 0; | |
1582 | ||
4d6bbb62 RL |
1583 | /* |
1584 | * Skip the next two words because they've already been | |
632dda83 | 1585 | * processed in the transport |
4d6bbb62 RL |
1586 | */ |
1587 | svc_getu32(argv); /* XID */ | |
1588 | svc_getnl(argv); /* CALLDIR */ | |
1589 | ||
632dda83 | 1590 | /* Parse and execute the bc call */ |
0d2a970d TM |
1591 | proc_error = svc_process_common(rqstp, argv, resv); |
1592 | ||
7402a4fe | 1593 | atomic_dec(&req->rq_xprt->bc_slot_count); |
0d2a970d | 1594 | if (!proc_error) { |
632dda83 | 1595 | /* Processing error: drop the request */ |
b3b02ae5 | 1596 | xprt_free_bc_request(req); |
8f7766c8 VA |
1597 | error = -EINVAL; |
1598 | goto out; | |
4b5b3ba1 | 1599 | } |
632dda83 CL |
1600 | /* Finally, send the reply synchronously */ |
1601 | memcpy(&req->rq_snd_buf, &rqstp->rq_res, sizeof(req->rq_snd_buf)); | |
0f419791 | 1602 | task = rpc_run_bc_task(req); |
632dda83 CL |
1603 | if (IS_ERR(task)) { |
1604 | error = PTR_ERR(task); | |
1605 | goto out; | |
1606 | } | |
1607 | ||
1608 | WARN_ON_ONCE(atomic_read(&task->tk_count) != 1); | |
1609 | error = task->tk_status; | |
1610 | rpc_put_task(task); | |
1611 | ||
1612 | out: | |
1613 | dprintk("svc: %s(), error=%d\n", __func__, error); | |
1614 | return error; | |
4d6bbb62 | 1615 | } |
0d961aa9 | 1616 | EXPORT_SYMBOL_GPL(bc_svc_process); |
9e00abc3 | 1617 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
4d6bbb62 | 1618 | |
7adae489 GB |
1619 | /* |
1620 | * Return (transport-specific) limit on the rpc payload. | |
1621 | */ | |
1622 | u32 svc_max_payload(const struct svc_rqst *rqstp) | |
1623 | { | |
49023155 | 1624 | u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload; |
7adae489 | 1625 | |
c6b0a9f8 N |
1626 | if (rqstp->rq_server->sv_max_payload < max) |
1627 | max = rqstp->rq_server->sv_max_payload; | |
7adae489 GB |
1628 | return max; |
1629 | } | |
1630 | EXPORT_SYMBOL_GPL(svc_max_payload); | |
8154ef27 | 1631 | |
41205539 | 1632 | /** |
03493bca | 1633 | * svc_encode_result_payload - mark a range of bytes as a result payload |
41205539 CL |
1634 | * @rqstp: svc_rqst to operate on |
1635 | * @offset: payload's byte offset in rqstp->rq_res | |
1636 | * @length: size of payload, in bytes | |
1637 | * | |
1638 | * Returns zero on success, or a negative errno if a permanent | |
1639 | * error occurred. | |
1640 | */ | |
03493bca CL |
1641 | int svc_encode_result_payload(struct svc_rqst *rqstp, unsigned int offset, |
1642 | unsigned int length) | |
41205539 | 1643 | { |
03493bca CL |
1644 | return rqstp->rq_xprt->xpt_ops->xpo_result_payload(rqstp, offset, |
1645 | length); | |
41205539 | 1646 | } |
03493bca | 1647 | EXPORT_SYMBOL_GPL(svc_encode_result_payload); |
41205539 | 1648 | |
8154ef27 CL |
1649 | /** |
1650 | * svc_fill_write_vector - Construct data argument for VFS write call | |
1651 | * @rqstp: svc_rqst to operate on | |
3fd9557a | 1652 | * @pages: list of pages containing data payload |
8154ef27 CL |
1653 | * @first: buffer containing first section of write payload |
1654 | * @total: total number of bytes of write payload | |
1655 | * | |
3fd9557a | 1656 | * Fills in rqstp::rq_vec, and returns the number of elements. |
8154ef27 | 1657 | */ |
3fd9557a CL |
1658 | unsigned int svc_fill_write_vector(struct svc_rqst *rqstp, struct page **pages, |
1659 | struct kvec *first, size_t total) | |
8154ef27 CL |
1660 | { |
1661 | struct kvec *vec = rqstp->rq_vec; | |
8154ef27 CL |
1662 | unsigned int i; |
1663 | ||
1664 | /* Some types of transport can present the write payload | |
1665 | * entirely in rq_arg.pages. In this case, @first is empty. | |
1666 | */ | |
1667 | i = 0; | |
1668 | if (first->iov_len) { | |
1669 | vec[i].iov_base = first->iov_base; | |
1670 | vec[i].iov_len = min_t(size_t, total, first->iov_len); | |
1671 | total -= vec[i].iov_len; | |
1672 | ++i; | |
1673 | } | |
1674 | ||
8154ef27 CL |
1675 | while (total) { |
1676 | vec[i].iov_base = page_address(*pages); | |
1677 | vec[i].iov_len = min_t(size_t, total, PAGE_SIZE); | |
1678 | total -= vec[i].iov_len; | |
1679 | ++i; | |
8154ef27 CL |
1680 | ++pages; |
1681 | } | |
1682 | ||
1683 | WARN_ON_ONCE(i > ARRAY_SIZE(rqstp->rq_vec)); | |
1684 | return i; | |
1685 | } | |
1686 | EXPORT_SYMBOL_GPL(svc_fill_write_vector); | |
38a70315 CL |
1687 | |
1688 | /** | |
1689 | * svc_fill_symlink_pathname - Construct pathname argument for VFS symlink call | |
1690 | * @rqstp: svc_rqst to operate on | |
1691 | * @first: buffer containing first section of pathname | |
11b4d66e | 1692 | * @p: buffer containing remaining section of pathname |
38a70315 CL |
1693 | * @total: total length of the pathname argument |
1694 | * | |
11b4d66e CL |
1695 | * The VFS symlink API demands a NUL-terminated pathname in mapped memory. |
1696 | * Returns pointer to a NUL-terminated string, or an ERR_PTR. Caller must free | |
1697 | * the returned string. | |
38a70315 CL |
1698 | */ |
1699 | char *svc_fill_symlink_pathname(struct svc_rqst *rqstp, struct kvec *first, | |
11b4d66e | 1700 | void *p, size_t total) |
38a70315 | 1701 | { |
11b4d66e CL |
1702 | size_t len, remaining; |
1703 | char *result, *dst; | |
38a70315 | 1704 | |
11b4d66e CL |
1705 | result = kmalloc(total + 1, GFP_KERNEL); |
1706 | if (!result) | |
1707 | return ERR_PTR(-ESERVERFAULT); | |
38a70315 | 1708 | |
11b4d66e CL |
1709 | dst = result; |
1710 | remaining = total; | |
38a70315 | 1711 | |
11b4d66e CL |
1712 | len = min_t(size_t, total, first->iov_len); |
1713 | if (len) { | |
38a70315 CL |
1714 | memcpy(dst, first->iov_base, len); |
1715 | dst += len; | |
1716 | remaining -= len; | |
11b4d66e | 1717 | } |
38a70315 | 1718 | |
11b4d66e CL |
1719 | if (remaining) { |
1720 | len = min_t(size_t, remaining, PAGE_SIZE); | |
1721 | memcpy(dst, p, len); | |
1722 | dst += len; | |
38a70315 CL |
1723 | } |
1724 | ||
11b4d66e CL |
1725 | *dst = '\0'; |
1726 | ||
1727 | /* Sanity check: Linux doesn't allow the pathname argument to | |
38a70315 CL |
1728 | * contain a NUL byte. |
1729 | */ | |
11b4d66e CL |
1730 | if (strlen(result) != total) { |
1731 | kfree(result); | |
38a70315 | 1732 | return ERR_PTR(-EINVAL); |
11b4d66e | 1733 | } |
38a70315 CL |
1734 | return result; |
1735 | } | |
1736 | EXPORT_SYMBOL_GPL(svc_fill_symlink_pathname); |