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1 | /* | |
2 | * Central processing for nfsd. | |
3 | * | |
4 | * Authors: Olaf Kirch (okir@monad.swb.de) | |
5 | * | |
6 | * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
9 | #include <linux/sched.h> | |
10 | #include <linux/freezer.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/fs_struct.h> | |
13 | #include <linux/swap.h> | |
14 | ||
15 | #include <linux/sunrpc/stats.h> | |
16 | #include <linux/sunrpc/svcsock.h> | |
17 | #include <linux/sunrpc/svc_xprt.h> | |
18 | #include <linux/lockd/bind.h> | |
19 | #include <linux/nfsacl.h> | |
20 | #include <linux/seq_file.h> | |
21 | #include <linux/inetdevice.h> | |
22 | #include <net/addrconf.h> | |
23 | #include <net/ipv6.h> | |
24 | #include <net/net_namespace.h> | |
25 | #include "nfsd.h" | |
26 | #include "cache.h" | |
27 | #include "vfs.h" | |
28 | #include "netns.h" | |
29 | ||
30 | #define NFSDDBG_FACILITY NFSDDBG_SVC | |
31 | ||
32 | extern struct svc_program nfsd_program; | |
33 | static int nfsd(void *vrqstp); | |
34 | ||
35 | /* | |
36 | * nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and the members | |
37 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some | |
38 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt | |
39 | * | |
40 | * If (out side the lock) nn->nfsd_serv is non-NULL, then it must point to a | |
41 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number | |
42 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each | |
43 | * entry of ->sv_pools[]. | |
44 | * | |
45 | * Transitions of the thread count between zero and non-zero are of particular | |
46 | * interest since the svc_serv needs to be created and initialized at that | |
47 | * point, or freed. | |
48 | * | |
49 | * Finally, the nfsd_mutex also protects some of the global variables that are | |
50 | * accessed when nfsd starts and that are settable via the write_* routines in | |
51 | * nfsctl.c. In particular: | |
52 | * | |
53 | * user_recovery_dirname | |
54 | * user_lease_time | |
55 | * nfsd_versions | |
56 | */ | |
57 | DEFINE_MUTEX(nfsd_mutex); | |
58 | ||
59 | /* | |
60 | * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used. | |
61 | * nfsd_drc_max_pages limits the total amount of memory available for | |
62 | * version 4.1 DRC caches. | |
63 | * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage. | |
64 | */ | |
65 | spinlock_t nfsd_drc_lock; | |
66 | unsigned long nfsd_drc_max_mem; | |
67 | unsigned long nfsd_drc_mem_used; | |
68 | ||
69 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
70 | static struct svc_stat nfsd_acl_svcstats; | |
71 | static struct svc_version * nfsd_acl_version[] = { | |
72 | [2] = &nfsd_acl_version2, | |
73 | [3] = &nfsd_acl_version3, | |
74 | }; | |
75 | ||
76 | #define NFSD_ACL_MINVERS 2 | |
77 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) | |
78 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; | |
79 | ||
80 | static struct svc_program nfsd_acl_program = { | |
81 | .pg_prog = NFS_ACL_PROGRAM, | |
82 | .pg_nvers = NFSD_ACL_NRVERS, | |
83 | .pg_vers = nfsd_acl_versions, | |
84 | .pg_name = "nfsacl", | |
85 | .pg_class = "nfsd", | |
86 | .pg_stats = &nfsd_acl_svcstats, | |
87 | .pg_authenticate = &svc_set_client, | |
88 | }; | |
89 | ||
90 | static struct svc_stat nfsd_acl_svcstats = { | |
91 | .program = &nfsd_acl_program, | |
92 | }; | |
93 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
94 | ||
95 | static struct svc_version * nfsd_version[] = { | |
96 | [2] = &nfsd_version2, | |
97 | #if defined(CONFIG_NFSD_V3) | |
98 | [3] = &nfsd_version3, | |
99 | #endif | |
100 | #if defined(CONFIG_NFSD_V4) | |
101 | [4] = &nfsd_version4, | |
102 | #endif | |
103 | }; | |
104 | ||
105 | #define NFSD_MINVERS 2 | |
106 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) | |
107 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; | |
108 | ||
109 | struct svc_program nfsd_program = { | |
110 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
111 | .pg_next = &nfsd_acl_program, | |
112 | #endif | |
113 | .pg_prog = NFS_PROGRAM, /* program number */ | |
114 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
115 | .pg_vers = nfsd_versions, /* version table */ | |
116 | .pg_name = "nfsd", /* program name */ | |
117 | .pg_class = "nfsd", /* authentication class */ | |
118 | .pg_stats = &nfsd_svcstats, /* version table */ | |
119 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
120 | ||
121 | }; | |
122 | ||
123 | static bool nfsd_supported_minorversions[NFSD_SUPPORTED_MINOR_VERSION + 1] = { | |
124 | [0] = 1, | |
125 | [1] = 1, | |
126 | [2] = 1, | |
127 | }; | |
128 | ||
129 | int nfsd_vers(int vers, enum vers_op change) | |
130 | { | |
131 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
132 | return 0; | |
133 | switch(change) { | |
134 | case NFSD_SET: | |
135 | nfsd_versions[vers] = nfsd_version[vers]; | |
136 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
137 | if (vers < NFSD_ACL_NRVERS) | |
138 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; | |
139 | #endif | |
140 | break; | |
141 | case NFSD_CLEAR: | |
142 | nfsd_versions[vers] = NULL; | |
143 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
144 | if (vers < NFSD_ACL_NRVERS) | |
145 | nfsd_acl_versions[vers] = NULL; | |
146 | #endif | |
147 | break; | |
148 | case NFSD_TEST: | |
149 | return nfsd_versions[vers] != NULL; | |
150 | case NFSD_AVAIL: | |
151 | return nfsd_version[vers] != NULL; | |
152 | } | |
153 | return 0; | |
154 | } | |
155 | ||
156 | int nfsd_minorversion(u32 minorversion, enum vers_op change) | |
157 | { | |
158 | if (minorversion > NFSD_SUPPORTED_MINOR_VERSION) | |
159 | return -1; | |
160 | switch(change) { | |
161 | case NFSD_SET: | |
162 | nfsd_supported_minorversions[minorversion] = true; | |
163 | break; | |
164 | case NFSD_CLEAR: | |
165 | nfsd_supported_minorversions[minorversion] = false; | |
166 | break; | |
167 | case NFSD_TEST: | |
168 | return nfsd_supported_minorversions[minorversion]; | |
169 | case NFSD_AVAIL: | |
170 | return minorversion <= NFSD_SUPPORTED_MINOR_VERSION; | |
171 | } | |
172 | return 0; | |
173 | } | |
174 | ||
175 | /* | |
176 | * Maximum number of nfsd processes | |
177 | */ | |
178 | #define NFSD_MAXSERVS 8192 | |
179 | ||
180 | int nfsd_nrthreads(struct net *net) | |
181 | { | |
182 | int rv = 0; | |
183 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
184 | ||
185 | mutex_lock(&nfsd_mutex); | |
186 | if (nn->nfsd_serv) | |
187 | rv = nn->nfsd_serv->sv_nrthreads; | |
188 | mutex_unlock(&nfsd_mutex); | |
189 | return rv; | |
190 | } | |
191 | ||
192 | static int nfsd_init_socks(struct net *net) | |
193 | { | |
194 | int error; | |
195 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
196 | ||
197 | if (!list_empty(&nn->nfsd_serv->sv_permsocks)) | |
198 | return 0; | |
199 | ||
200 | error = svc_create_xprt(nn->nfsd_serv, "udp", net, PF_INET, NFS_PORT, | |
201 | SVC_SOCK_DEFAULTS); | |
202 | if (error < 0) | |
203 | return error; | |
204 | ||
205 | error = svc_create_xprt(nn->nfsd_serv, "tcp", net, PF_INET, NFS_PORT, | |
206 | SVC_SOCK_DEFAULTS); | |
207 | if (error < 0) | |
208 | return error; | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | static int nfsd_users = 0; | |
214 | ||
215 | static int nfsd_startup_generic(int nrservs) | |
216 | { | |
217 | int ret; | |
218 | ||
219 | if (nfsd_users++) | |
220 | return 0; | |
221 | ||
222 | /* | |
223 | * Readahead param cache - will no-op if it already exists. | |
224 | * (Note therefore results will be suboptimal if number of | |
225 | * threads is modified after nfsd start.) | |
226 | */ | |
227 | ret = nfsd_racache_init(2*nrservs); | |
228 | if (ret) | |
229 | goto dec_users; | |
230 | ||
231 | ret = nfs4_state_start(); | |
232 | if (ret) | |
233 | goto out_racache; | |
234 | return 0; | |
235 | ||
236 | out_racache: | |
237 | nfsd_racache_shutdown(); | |
238 | dec_users: | |
239 | nfsd_users--; | |
240 | return ret; | |
241 | } | |
242 | ||
243 | static void nfsd_shutdown_generic(void) | |
244 | { | |
245 | if (--nfsd_users) | |
246 | return; | |
247 | ||
248 | nfs4_state_shutdown(); | |
249 | nfsd_racache_shutdown(); | |
250 | } | |
251 | ||
252 | static bool nfsd_needs_lockd(void) | |
253 | { | |
254 | #if defined(CONFIG_NFSD_V3) | |
255 | return (nfsd_versions[2] != NULL) || (nfsd_versions[3] != NULL); | |
256 | #else | |
257 | return (nfsd_versions[2] != NULL); | |
258 | #endif | |
259 | } | |
260 | ||
261 | static int nfsd_startup_net(int nrservs, struct net *net) | |
262 | { | |
263 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
264 | int ret; | |
265 | ||
266 | if (nn->nfsd_net_up) | |
267 | return 0; | |
268 | ||
269 | ret = nfsd_startup_generic(nrservs); | |
270 | if (ret) | |
271 | return ret; | |
272 | ret = nfsd_init_socks(net); | |
273 | if (ret) | |
274 | goto out_socks; | |
275 | ||
276 | if (nfsd_needs_lockd() && !nn->lockd_up) { | |
277 | ret = lockd_up(net); | |
278 | if (ret) | |
279 | goto out_socks; | |
280 | nn->lockd_up = 1; | |
281 | } | |
282 | ||
283 | ret = nfs4_state_start_net(net); | |
284 | if (ret) | |
285 | goto out_lockd; | |
286 | ||
287 | nn->nfsd_net_up = true; | |
288 | return 0; | |
289 | ||
290 | out_lockd: | |
291 | if (nn->lockd_up) { | |
292 | lockd_down(net); | |
293 | nn->lockd_up = 0; | |
294 | } | |
295 | out_socks: | |
296 | nfsd_shutdown_generic(); | |
297 | return ret; | |
298 | } | |
299 | ||
300 | static void nfsd_shutdown_net(struct net *net) | |
301 | { | |
302 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
303 | ||
304 | nfs4_state_shutdown_net(net); | |
305 | if (nn->lockd_up) { | |
306 | lockd_down(net); | |
307 | nn->lockd_up = 0; | |
308 | } | |
309 | nn->nfsd_net_up = false; | |
310 | nfsd_shutdown_generic(); | |
311 | } | |
312 | ||
313 | static int nfsd_inetaddr_event(struct notifier_block *this, unsigned long event, | |
314 | void *ptr) | |
315 | { | |
316 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; | |
317 | struct net_device *dev = ifa->ifa_dev->dev; | |
318 | struct net *net = dev_net(dev); | |
319 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
320 | struct sockaddr_in sin; | |
321 | ||
322 | if (event != NETDEV_DOWN) | |
323 | goto out; | |
324 | ||
325 | if (nn->nfsd_serv) { | |
326 | dprintk("nfsd_inetaddr_event: removed %pI4\n", &ifa->ifa_local); | |
327 | sin.sin_family = AF_INET; | |
328 | sin.sin_addr.s_addr = ifa->ifa_local; | |
329 | svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin); | |
330 | } | |
331 | ||
332 | out: | |
333 | return NOTIFY_DONE; | |
334 | } | |
335 | ||
336 | static struct notifier_block nfsd_inetaddr_notifier = { | |
337 | .notifier_call = nfsd_inetaddr_event, | |
338 | }; | |
339 | ||
340 | #if IS_ENABLED(CONFIG_IPV6) | |
341 | static int nfsd_inet6addr_event(struct notifier_block *this, | |
342 | unsigned long event, void *ptr) | |
343 | { | |
344 | struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; | |
345 | struct net_device *dev = ifa->idev->dev; | |
346 | struct net *net = dev_net(dev); | |
347 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
348 | struct sockaddr_in6 sin6; | |
349 | ||
350 | if (event != NETDEV_DOWN) | |
351 | goto out; | |
352 | ||
353 | if (nn->nfsd_serv) { | |
354 | dprintk("nfsd_inet6addr_event: removed %pI6\n", &ifa->addr); | |
355 | sin6.sin6_family = AF_INET6; | |
356 | sin6.sin6_addr = ifa->addr; | |
357 | svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin6); | |
358 | } | |
359 | ||
360 | out: | |
361 | return NOTIFY_DONE; | |
362 | } | |
363 | ||
364 | static struct notifier_block nfsd_inet6addr_notifier = { | |
365 | .notifier_call = nfsd_inet6addr_event, | |
366 | }; | |
367 | #endif | |
368 | ||
369 | static void nfsd_last_thread(struct svc_serv *serv, struct net *net) | |
370 | { | |
371 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
372 | ||
373 | unregister_inetaddr_notifier(&nfsd_inetaddr_notifier); | |
374 | #if IS_ENABLED(CONFIG_IPV6) | |
375 | unregister_inet6addr_notifier(&nfsd_inet6addr_notifier); | |
376 | #endif | |
377 | /* | |
378 | * write_ports can create the server without actually starting | |
379 | * any threads--if we get shut down before any threads are | |
380 | * started, then nfsd_last_thread will be run before any of this | |
381 | * other initialization has been done except the rpcb information. | |
382 | */ | |
383 | svc_rpcb_cleanup(serv, net); | |
384 | if (!nn->nfsd_net_up) | |
385 | return; | |
386 | ||
387 | nfsd_shutdown_net(net); | |
388 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " | |
389 | "cache\n"); | |
390 | nfsd_export_flush(net); | |
391 | } | |
392 | ||
393 | void nfsd_reset_versions(void) | |
394 | { | |
395 | int found_one = 0; | |
396 | int i; | |
397 | ||
398 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
399 | if (nfsd_program.pg_vers[i]) | |
400 | found_one = 1; | |
401 | } | |
402 | ||
403 | if (!found_one) { | |
404 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
405 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
406 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
407 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
408 | nfsd_acl_program.pg_vers[i] = | |
409 | nfsd_acl_version[i]; | |
410 | #endif | |
411 | } | |
412 | } | |
413 | ||
414 | /* | |
415 | * Each session guarantees a negotiated per slot memory cache for replies | |
416 | * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated | |
417 | * NFSv4.1 server might want to use more memory for a DRC than a machine | |
418 | * with mutiple services. | |
419 | * | |
420 | * Impose a hard limit on the number of pages for the DRC which varies | |
421 | * according to the machines free pages. This is of course only a default. | |
422 | * | |
423 | * For now this is a #defined shift which could be under admin control | |
424 | * in the future. | |
425 | */ | |
426 | static void set_max_drc(void) | |
427 | { | |
428 | #define NFSD_DRC_SIZE_SHIFT 10 | |
429 | nfsd_drc_max_mem = (nr_free_buffer_pages() | |
430 | >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; | |
431 | nfsd_drc_mem_used = 0; | |
432 | spin_lock_init(&nfsd_drc_lock); | |
433 | dprintk("%s nfsd_drc_max_mem %lu \n", __func__, nfsd_drc_max_mem); | |
434 | } | |
435 | ||
436 | static int nfsd_get_default_max_blksize(void) | |
437 | { | |
438 | struct sysinfo i; | |
439 | unsigned long long target; | |
440 | unsigned long ret; | |
441 | ||
442 | si_meminfo(&i); | |
443 | target = (i.totalram - i.totalhigh) << PAGE_SHIFT; | |
444 | /* | |
445 | * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig | |
446 | * machines, but only uses 32K on 128M machines. Bottom out at | |
447 | * 8K on 32M and smaller. Of course, this is only a default. | |
448 | */ | |
449 | target >>= 12; | |
450 | ||
451 | ret = NFSSVC_MAXBLKSIZE; | |
452 | while (ret > target && ret >= 8*1024*2) | |
453 | ret /= 2; | |
454 | return ret; | |
455 | } | |
456 | ||
457 | static struct svc_serv_ops nfsd_thread_sv_ops = { | |
458 | .svo_shutdown = nfsd_last_thread, | |
459 | .svo_function = nfsd, | |
460 | .svo_enqueue_xprt = svc_xprt_do_enqueue, | |
461 | .svo_setup = svc_set_num_threads, | |
462 | .svo_module = THIS_MODULE, | |
463 | }; | |
464 | ||
465 | int nfsd_create_serv(struct net *net) | |
466 | { | |
467 | int error; | |
468 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
469 | ||
470 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); | |
471 | if (nn->nfsd_serv) { | |
472 | svc_get(nn->nfsd_serv); | |
473 | return 0; | |
474 | } | |
475 | if (nfsd_max_blksize == 0) | |
476 | nfsd_max_blksize = nfsd_get_default_max_blksize(); | |
477 | nfsd_reset_versions(); | |
478 | nn->nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, | |
479 | &nfsd_thread_sv_ops); | |
480 | if (nn->nfsd_serv == NULL) | |
481 | return -ENOMEM; | |
482 | ||
483 | nn->nfsd_serv->sv_maxconn = nn->max_connections; | |
484 | error = svc_bind(nn->nfsd_serv, net); | |
485 | if (error < 0) { | |
486 | svc_destroy(nn->nfsd_serv); | |
487 | return error; | |
488 | } | |
489 | ||
490 | set_max_drc(); | |
491 | register_inetaddr_notifier(&nfsd_inetaddr_notifier); | |
492 | #if IS_ENABLED(CONFIG_IPV6) | |
493 | register_inet6addr_notifier(&nfsd_inet6addr_notifier); | |
494 | #endif | |
495 | do_gettimeofday(&nn->nfssvc_boot); /* record boot time */ | |
496 | return 0; | |
497 | } | |
498 | ||
499 | int nfsd_nrpools(struct net *net) | |
500 | { | |
501 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
502 | ||
503 | if (nn->nfsd_serv == NULL) | |
504 | return 0; | |
505 | else | |
506 | return nn->nfsd_serv->sv_nrpools; | |
507 | } | |
508 | ||
509 | int nfsd_get_nrthreads(int n, int *nthreads, struct net *net) | |
510 | { | |
511 | int i = 0; | |
512 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
513 | ||
514 | if (nn->nfsd_serv != NULL) { | |
515 | for (i = 0; i < nn->nfsd_serv->sv_nrpools && i < n; i++) | |
516 | nthreads[i] = nn->nfsd_serv->sv_pools[i].sp_nrthreads; | |
517 | } | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
522 | void nfsd_destroy(struct net *net) | |
523 | { | |
524 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
525 | int destroy = (nn->nfsd_serv->sv_nrthreads == 1); | |
526 | ||
527 | if (destroy) | |
528 | svc_shutdown_net(nn->nfsd_serv, net); | |
529 | svc_destroy(nn->nfsd_serv); | |
530 | if (destroy) | |
531 | nn->nfsd_serv = NULL; | |
532 | } | |
533 | ||
534 | int nfsd_set_nrthreads(int n, int *nthreads, struct net *net) | |
535 | { | |
536 | int i = 0; | |
537 | int tot = 0; | |
538 | int err = 0; | |
539 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
540 | ||
541 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); | |
542 | ||
543 | if (nn->nfsd_serv == NULL || n <= 0) | |
544 | return 0; | |
545 | ||
546 | if (n > nn->nfsd_serv->sv_nrpools) | |
547 | n = nn->nfsd_serv->sv_nrpools; | |
548 | ||
549 | /* enforce a global maximum number of threads */ | |
550 | tot = 0; | |
551 | for (i = 0; i < n; i++) { | |
552 | nthreads[i] = min(nthreads[i], NFSD_MAXSERVS); | |
553 | tot += nthreads[i]; | |
554 | } | |
555 | if (tot > NFSD_MAXSERVS) { | |
556 | /* total too large: scale down requested numbers */ | |
557 | for (i = 0; i < n && tot > 0; i++) { | |
558 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
559 | tot -= (nthreads[i] - new); | |
560 | nthreads[i] = new; | |
561 | } | |
562 | for (i = 0; i < n && tot > 0; i++) { | |
563 | nthreads[i]--; | |
564 | tot--; | |
565 | } | |
566 | } | |
567 | ||
568 | /* | |
569 | * There must always be a thread in pool 0; the admin | |
570 | * can't shut down NFS completely using pool_threads. | |
571 | */ | |
572 | if (nthreads[0] == 0) | |
573 | nthreads[0] = 1; | |
574 | ||
575 | /* apply the new numbers */ | |
576 | svc_get(nn->nfsd_serv); | |
577 | for (i = 0; i < n; i++) { | |
578 | err = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv, | |
579 | &nn->nfsd_serv->sv_pools[i], nthreads[i]); | |
580 | if (err) | |
581 | break; | |
582 | } | |
583 | nfsd_destroy(net); | |
584 | return err; | |
585 | } | |
586 | ||
587 | /* | |
588 | * Adjust the number of threads and return the new number of threads. | |
589 | * This is also the function that starts the server if necessary, if | |
590 | * this is the first time nrservs is nonzero. | |
591 | */ | |
592 | int | |
593 | nfsd_svc(int nrservs, struct net *net) | |
594 | { | |
595 | int error; | |
596 | bool nfsd_up_before; | |
597 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
598 | ||
599 | mutex_lock(&nfsd_mutex); | |
600 | dprintk("nfsd: creating service\n"); | |
601 | ||
602 | nrservs = max(nrservs, 0); | |
603 | nrservs = min(nrservs, NFSD_MAXSERVS); | |
604 | error = 0; | |
605 | ||
606 | if (nrservs == 0 && nn->nfsd_serv == NULL) | |
607 | goto out; | |
608 | ||
609 | error = nfsd_create_serv(net); | |
610 | if (error) | |
611 | goto out; | |
612 | ||
613 | nfsd_up_before = nn->nfsd_net_up; | |
614 | ||
615 | error = nfsd_startup_net(nrservs, net); | |
616 | if (error) | |
617 | goto out_destroy; | |
618 | error = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv, | |
619 | NULL, nrservs); | |
620 | if (error) | |
621 | goto out_shutdown; | |
622 | /* We are holding a reference to nn->nfsd_serv which | |
623 | * we don't want to count in the return value, | |
624 | * so subtract 1 | |
625 | */ | |
626 | error = nn->nfsd_serv->sv_nrthreads - 1; | |
627 | out_shutdown: | |
628 | if (error < 0 && !nfsd_up_before) | |
629 | nfsd_shutdown_net(net); | |
630 | out_destroy: | |
631 | nfsd_destroy(net); /* Release server */ | |
632 | out: | |
633 | mutex_unlock(&nfsd_mutex); | |
634 | return error; | |
635 | } | |
636 | ||
637 | ||
638 | /* | |
639 | * This is the NFS server kernel thread | |
640 | */ | |
641 | static int | |
642 | nfsd(void *vrqstp) | |
643 | { | |
644 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; | |
645 | struct svc_xprt *perm_sock = list_entry(rqstp->rq_server->sv_permsocks.next, typeof(struct svc_xprt), xpt_list); | |
646 | struct net *net = perm_sock->xpt_net; | |
647 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
648 | int err; | |
649 | ||
650 | /* Lock module and set up kernel thread */ | |
651 | mutex_lock(&nfsd_mutex); | |
652 | ||
653 | /* At this point, the thread shares current->fs | |
654 | * with the init process. We need to create files with a | |
655 | * umask of 0 instead of init's umask. */ | |
656 | if (unshare_fs_struct() < 0) { | |
657 | printk("Unable to start nfsd thread: out of memory\n"); | |
658 | goto out; | |
659 | } | |
660 | ||
661 | current->fs->umask = 0; | |
662 | ||
663 | /* | |
664 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
665 | * the ones that will bring down the thread | |
666 | */ | |
667 | allow_signal(SIGKILL); | |
668 | allow_signal(SIGHUP); | |
669 | allow_signal(SIGINT); | |
670 | allow_signal(SIGQUIT); | |
671 | ||
672 | nfsdstats.th_cnt++; | |
673 | mutex_unlock(&nfsd_mutex); | |
674 | ||
675 | set_freezable(); | |
676 | ||
677 | /* | |
678 | * The main request loop | |
679 | */ | |
680 | for (;;) { | |
681 | /* Update sv_maxconn if it has changed */ | |
682 | rqstp->rq_server->sv_maxconn = nn->max_connections; | |
683 | ||
684 | /* | |
685 | * Find a socket with data available and call its | |
686 | * recvfrom routine. | |
687 | */ | |
688 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) | |
689 | ; | |
690 | if (err == -EINTR) | |
691 | break; | |
692 | validate_process_creds(); | |
693 | svc_process(rqstp); | |
694 | validate_process_creds(); | |
695 | } | |
696 | ||
697 | /* Clear signals before calling svc_exit_thread() */ | |
698 | flush_signals(current); | |
699 | ||
700 | mutex_lock(&nfsd_mutex); | |
701 | nfsdstats.th_cnt --; | |
702 | ||
703 | out: | |
704 | rqstp->rq_server = NULL; | |
705 | ||
706 | /* Release the thread */ | |
707 | svc_exit_thread(rqstp); | |
708 | ||
709 | nfsd_destroy(net); | |
710 | ||
711 | /* Release module */ | |
712 | mutex_unlock(&nfsd_mutex); | |
713 | module_put_and_exit(0); | |
714 | return 0; | |
715 | } | |
716 | ||
717 | static __be32 map_new_errors(u32 vers, __be32 nfserr) | |
718 | { | |
719 | if (nfserr == nfserr_jukebox && vers == 2) | |
720 | return nfserr_dropit; | |
721 | if (nfserr == nfserr_wrongsec && vers < 4) | |
722 | return nfserr_acces; | |
723 | return nfserr; | |
724 | } | |
725 | ||
726 | int | |
727 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) | |
728 | { | |
729 | struct svc_procedure *proc; | |
730 | kxdrproc_t xdr; | |
731 | __be32 nfserr; | |
732 | __be32 *nfserrp; | |
733 | ||
734 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
735 | rqstp->rq_vers, rqstp->rq_proc); | |
736 | proc = rqstp->rq_procinfo; | |
737 | ||
738 | /* | |
739 | * Give the xdr decoder a chance to change this if it wants | |
740 | * (necessary in the NFSv4.0 compound case) | |
741 | */ | |
742 | rqstp->rq_cachetype = proc->pc_cachetype; | |
743 | /* Decode arguments */ | |
744 | xdr = proc->pc_decode; | |
745 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, | |
746 | rqstp->rq_argp)) { | |
747 | dprintk("nfsd: failed to decode arguments!\n"); | |
748 | *statp = rpc_garbage_args; | |
749 | return 1; | |
750 | } | |
751 | ||
752 | /* Check whether we have this call in the cache. */ | |
753 | switch (nfsd_cache_lookup(rqstp)) { | |
754 | case RC_DROPIT: | |
755 | return 0; | |
756 | case RC_REPLY: | |
757 | return 1; | |
758 | case RC_DOIT:; | |
759 | /* do it */ | |
760 | } | |
761 | ||
762 | /* need to grab the location to store the status, as | |
763 | * nfsv4 does some encoding while processing | |
764 | */ | |
765 | nfserrp = rqstp->rq_res.head[0].iov_base | |
766 | + rqstp->rq_res.head[0].iov_len; | |
767 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); | |
768 | ||
769 | /* Now call the procedure handler, and encode NFS status. */ | |
770 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
771 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); | |
772 | if (nfserr == nfserr_dropit || test_bit(RQ_DROPME, &rqstp->rq_flags)) { | |
773 | dprintk("nfsd: Dropping request; may be revisited later\n"); | |
774 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
775 | return 0; | |
776 | } | |
777 | ||
778 | if (rqstp->rq_proc != 0) | |
779 | *nfserrp++ = nfserr; | |
780 | ||
781 | /* Encode result. | |
782 | * For NFSv2, additional info is never returned in case of an error. | |
783 | */ | |
784 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
785 | xdr = proc->pc_encode; | |
786 | if (xdr && !xdr(rqstp, nfserrp, | |
787 | rqstp->rq_resp)) { | |
788 | /* Failed to encode result. Release cache entry */ | |
789 | dprintk("nfsd: failed to encode result!\n"); | |
790 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
791 | *statp = rpc_system_err; | |
792 | return 1; | |
793 | } | |
794 | } | |
795 | ||
796 | /* Store reply in cache. */ | |
797 | nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1); | |
798 | return 1; | |
799 | } | |
800 | ||
801 | int nfsd_pool_stats_open(struct inode *inode, struct file *file) | |
802 | { | |
803 | int ret; | |
804 | struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id); | |
805 | ||
806 | mutex_lock(&nfsd_mutex); | |
807 | if (nn->nfsd_serv == NULL) { | |
808 | mutex_unlock(&nfsd_mutex); | |
809 | return -ENODEV; | |
810 | } | |
811 | /* bump up the psudo refcount while traversing */ | |
812 | svc_get(nn->nfsd_serv); | |
813 | ret = svc_pool_stats_open(nn->nfsd_serv, file); | |
814 | mutex_unlock(&nfsd_mutex); | |
815 | return ret; | |
816 | } | |
817 | ||
818 | int nfsd_pool_stats_release(struct inode *inode, struct file *file) | |
819 | { | |
820 | int ret = seq_release(inode, file); | |
821 | struct net *net = inode->i_sb->s_fs_info; | |
822 | ||
823 | mutex_lock(&nfsd_mutex); | |
824 | /* this function really, really should have been called svc_put() */ | |
825 | nfsd_destroy(net); | |
826 | mutex_unlock(&nfsd_mutex); | |
827 | return ret; | |
828 | } |