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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
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 | ||
e8edc6e0 | 9 | #include <linux/sched.h> |
83144186 | 10 | #include <linux/freezer.h> |
143cb494 | 11 | #include <linux/module.h> |
1da177e4 | 12 | #include <linux/fs_struct.h> |
c3d06f9c | 13 | #include <linux/swap.h> |
1da177e4 | 14 | |
1da177e4 | 15 | #include <linux/sunrpc/stats.h> |
1da177e4 | 16 | #include <linux/sunrpc/svcsock.h> |
36684996 | 17 | #include <linux/sunrpc/svc_xprt.h> |
1da177e4 | 18 | #include <linux/lockd/bind.h> |
a257cdd0 | 19 | #include <linux/nfsacl.h> |
ed2d8aed | 20 | #include <linux/seq_file.h> |
36684996 SM |
21 | #include <linux/inetdevice.h> |
22 | #include <net/addrconf.h> | |
23 | #include <net/ipv6.h> | |
fc5d00b0 | 24 | #include <net/net_namespace.h> |
9a74af21 BH |
25 | #include "nfsd.h" |
26 | #include "cache.h" | |
0a3adade | 27 | #include "vfs.h" |
2c2fe290 | 28 | #include "netns.h" |
1da177e4 LT |
29 | |
30 | #define NFSDDBG_FACILITY NFSDDBG_SVC | |
31 | ||
1da177e4 | 32 | extern struct svc_program nfsd_program; |
9867d76c | 33 | static int nfsd(void *vrqstp); |
1da177e4 | 34 | |
bedbdd8b | 35 | /* |
9dd9845f | 36 | * nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and the members |
bedbdd8b NB |
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 | * | |
9dd9845f | 40 | * If (out side the lock) nn->nfsd_serv is non-NULL, then it must point to a |
bedbdd8b NB |
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. | |
3dd98a3b JL |
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 | |
bedbdd8b NB |
56 | */ |
57 | DEFINE_MUTEX(nfsd_mutex); | |
bedbdd8b | 58 | |
4bd9b0f4 AA |
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; | |
697ce9be ZY |
66 | unsigned long nfsd_drc_max_mem; |
67 | unsigned long nfsd_drc_mem_used; | |
4bd9b0f4 | 68 | |
3fb803a9 AG |
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 | |
e8c96f8c | 77 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
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, | |
1a8eff6d | 84 | .pg_name = "nfsacl", |
3fb803a9 AG |
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 | ||
70c3b76c N |
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 | |
e8c96f8c | 106 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
107 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
108 | ||
109 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
110 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
111 | .pg_next = &nfsd_acl_program, | |
112 | #endif | |
70c3b76c N |
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 | ||
35f7a14f BF |
123 | static bool nfsd_supported_minorversions[NFSD_SUPPORTED_MINOR_VERSION + 1] = { |
124 | [0] = 1, | |
125 | [1] = 1, | |
c23ae601 | 126 | [2] = 1, |
35f7a14f | 127 | }; |
8daf220a | 128 | |
6658d3a7 N |
129 | int nfsd_vers(int vers, enum vers_op change) |
130 | { | |
131 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
15ddb4ae | 132 | return 0; |
6658d3a7 N |
133 | switch(change) { |
134 | case NFSD_SET: | |
135 | nfsd_versions[vers] = nfsd_version[vers]; | |
6658d3a7 N |
136 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
137 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 138 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
6658d3a7 | 139 | #endif |
1a8eff6d | 140 | break; |
6658d3a7 N |
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) | |
1a8eff6d | 145 | nfsd_acl_versions[vers] = NULL; |
6658d3a7 N |
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 | } | |
8daf220a BH |
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: | |
35f7a14f | 162 | nfsd_supported_minorversions[minorversion] = true; |
8daf220a BH |
163 | break; |
164 | case NFSD_CLEAR: | |
35f7a14f | 165 | nfsd_supported_minorversions[minorversion] = false; |
8daf220a BH |
166 | break; |
167 | case NFSD_TEST: | |
35f7a14f | 168 | return nfsd_supported_minorversions[minorversion]; |
8daf220a BH |
169 | case NFSD_AVAIL: |
170 | return minorversion <= NFSD_SUPPORTED_MINOR_VERSION; | |
171 | } | |
172 | return 0; | |
173 | } | |
174 | ||
1da177e4 LT |
175 | /* |
176 | * Maximum number of nfsd processes | |
177 | */ | |
178 | #define NFSD_MAXSERVS 8192 | |
179 | ||
9dd9845f | 180 | int nfsd_nrthreads(struct net *net) |
1da177e4 | 181 | { |
c7d106c9 | 182 | int rv = 0; |
9dd9845f SK |
183 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
184 | ||
c7d106c9 | 185 | mutex_lock(&nfsd_mutex); |
9dd9845f SK |
186 | if (nn->nfsd_serv) |
187 | rv = nn->nfsd_serv->sv_nrthreads; | |
c7d106c9 NB |
188 | mutex_unlock(&nfsd_mutex); |
189 | return rv; | |
1da177e4 LT |
190 | } |
191 | ||
db6e182c | 192 | static int nfsd_init_socks(struct net *net) |
59db4a0c BF |
193 | { |
194 | int error; | |
9dd9845f SK |
195 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
196 | ||
197 | if (!list_empty(&nn->nfsd_serv->sv_permsocks)) | |
59db4a0c BF |
198 | return 0; |
199 | ||
9dd9845f | 200 | error = svc_create_xprt(nn->nfsd_serv, "udp", net, PF_INET, NFS_PORT, |
59db4a0c BF |
201 | SVC_SOCK_DEFAULTS); |
202 | if (error < 0) | |
203 | return error; | |
204 | ||
9dd9845f | 205 | error = svc_create_xprt(nn->nfsd_serv, "tcp", net, PF_INET, NFS_PORT, |
59db4a0c BF |
206 | SVC_SOCK_DEFAULTS); |
207 | if (error < 0) | |
208 | return error; | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
4539f149 | 213 | static int nfsd_users = 0; |
4ad9a344 | 214 | |
bda9cac1 SK |
215 | static int nfsd_startup_generic(int nrservs) |
216 | { | |
217 | int ret; | |
218 | ||
4539f149 | 219 | if (nfsd_users++) |
bda9cac1 SK |
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) | |
d9499a95 KM |
229 | goto dec_users; |
230 | ||
bda9cac1 SK |
231 | ret = nfs4_state_start(); |
232 | if (ret) | |
233 | goto out_racache; | |
234 | return 0; | |
235 | ||
236 | out_racache: | |
237 | nfsd_racache_shutdown(); | |
d9499a95 KM |
238 | dec_users: |
239 | nfsd_users--; | |
bda9cac1 SK |
240 | return ret; |
241 | } | |
242 | ||
243 | static void nfsd_shutdown_generic(void) | |
244 | { | |
4539f149 SK |
245 | if (--nfsd_users) |
246 | return; | |
247 | ||
bda9cac1 SK |
248 | nfs4_state_shutdown(); |
249 | nfsd_racache_shutdown(); | |
250 | } | |
251 | ||
8ef66714 KM |
252 | static bool nfsd_needs_lockd(void) |
253 | { | |
ff88825f | 254 | #if defined(CONFIG_NFSD_V3) |
8ef66714 | 255 | return (nfsd_versions[2] != NULL) || (nfsd_versions[3] != NULL); |
ff88825f KM |
256 | #else |
257 | return (nfsd_versions[2] != NULL); | |
258 | #endif | |
8ef66714 KM |
259 | } |
260 | ||
903d9bf0 | 261 | static int nfsd_startup_net(int nrservs, struct net *net) |
6ff50b3d | 262 | { |
2c2fe290 | 263 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
6ff50b3d SK |
264 | int ret; |
265 | ||
2c2fe290 SK |
266 | if (nn->nfsd_net_up) |
267 | return 0; | |
268 | ||
903d9bf0 | 269 | ret = nfsd_startup_generic(nrservs); |
6ff50b3d SK |
270 | if (ret) |
271 | return ret; | |
903d9bf0 SK |
272 | ret = nfsd_init_socks(net); |
273 | if (ret) | |
274 | goto out_socks; | |
8ef66714 KM |
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 | ||
6ff50b3d SK |
283 | ret = nfs4_state_start_net(net); |
284 | if (ret) | |
285 | goto out_lockd; | |
286 | ||
2c2fe290 | 287 | nn->nfsd_net_up = true; |
6ff50b3d SK |
288 | return 0; |
289 | ||
290 | out_lockd: | |
8ef66714 KM |
291 | if (nn->lockd_up) { |
292 | lockd_down(net); | |
293 | nn->lockd_up = 0; | |
294 | } | |
903d9bf0 | 295 | out_socks: |
bda9cac1 | 296 | nfsd_shutdown_generic(); |
4ad9a344 JL |
297 | return ret; |
298 | } | |
299 | ||
6ff50b3d SK |
300 | static void nfsd_shutdown_net(struct net *net) |
301 | { | |
2c2fe290 SK |
302 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
303 | ||
6ff50b3d | 304 | nfs4_state_shutdown_net(net); |
8ef66714 KM |
305 | if (nn->lockd_up) { |
306 | lockd_down(net); | |
307 | nn->lockd_up = 0; | |
308 | } | |
2c2fe290 | 309 | nn->nfsd_net_up = false; |
903d9bf0 | 310 | nfsd_shutdown_generic(); |
6ff50b3d SK |
311 | } |
312 | ||
36684996 SM |
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 | ||
541e864f | 369 | static void nfsd_last_thread(struct svc_serv *serv, struct net *net) |
4ad9a344 | 370 | { |
903d9bf0 SK |
371 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
372 | ||
36684996 SM |
373 | unregister_inetaddr_notifier(&nfsd_inetaddr_notifier); |
374 | #if IS_ENABLED(CONFIG_IPV6) | |
375 | unregister_inet6addr_notifier(&nfsd_inet6addr_notifier); | |
376 | #endif | |
4ad9a344 JL |
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 | |
691412b4 | 381 | * other initialization has been done except the rpcb information. |
4ad9a344 | 382 | */ |
691412b4 | 383 | svc_rpcb_cleanup(serv, net); |
903d9bf0 | 384 | if (!nn->nfsd_net_up) |
4ad9a344 | 385 | return; |
16d05870 | 386 | |
691412b4 | 387 | nfsd_shutdown_net(net); |
e096bbc6 JL |
388 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
389 | "cache\n"); | |
b3853e0e | 390 | nfsd_export_flush(net); |
bc591ccf | 391 | } |
6658d3a7 N |
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 | ||
c3d06f9c AA |
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 | { | |
6a14dd1a | 428 | #define NFSD_DRC_SIZE_SHIFT 10 |
0c193054 AA |
429 | nfsd_drc_max_mem = (nr_free_buffer_pages() |
430 | >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; | |
431 | nfsd_drc_mem_used = 0; | |
4bd9b0f4 | 432 | spin_lock_init(&nfsd_drc_lock); |
697ce9be | 433 | dprintk("%s nfsd_drc_max_mem %lu \n", __func__, nfsd_drc_max_mem); |
c3d06f9c | 434 | } |
bedbdd8b | 435 | |
87b0fc7d | 436 | static int nfsd_get_default_max_blksize(void) |
02a375f0 | 437 | { |
87b0fc7d BF |
438 | struct sysinfo i; |
439 | unsigned long long target; | |
440 | unsigned long ret; | |
bedbdd8b | 441 | |
87b0fc7d | 442 | si_meminfo(&i); |
508f9227 | 443 | target = (i.totalram - i.totalhigh) << PAGE_SHIFT; |
87b0fc7d BF |
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 | ||
b9e13cdf JL |
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, | |
598e2359 | 461 | .svo_setup = svc_set_num_threads, |
b9e13cdf | 462 | .svo_module = THIS_MODULE, |
ea126e74 JL |
463 | }; |
464 | ||
6777436b | 465 | int nfsd_create_serv(struct net *net) |
87b0fc7d | 466 | { |
9793f7c8 | 467 | int error; |
b9c0ef85 | 468 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
9793f7c8 | 469 | |
bedbdd8b | 470 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
9dd9845f SK |
471 | if (nn->nfsd_serv) { |
472 | svc_get(nn->nfsd_serv); | |
02a375f0 N |
473 | return 0; |
474 | } | |
87b0fc7d BF |
475 | if (nfsd_max_blksize == 0) |
476 | nfsd_max_blksize = nfsd_get_default_max_blksize(); | |
e844a7b9 | 477 | nfsd_reset_versions(); |
9dd9845f | 478 | nn->nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
b9e13cdf | 479 | &nfsd_thread_sv_ops); |
9dd9845f | 480 | if (nn->nfsd_serv == NULL) |
628b3687 | 481 | return -ENOMEM; |
bedbdd8b | 482 | |
5b8db00b | 483 | nn->nfsd_serv->sv_maxconn = nn->max_connections; |
9dd9845f | 484 | error = svc_bind(nn->nfsd_serv, net); |
9793f7c8 | 485 | if (error < 0) { |
9dd9845f | 486 | svc_destroy(nn->nfsd_serv); |
9793f7c8 SK |
487 | return error; |
488 | } | |
489 | ||
628b3687 | 490 | set_max_drc(); |
36684996 SM |
491 | register_inetaddr_notifier(&nfsd_inetaddr_notifier); |
492 | #if IS_ENABLED(CONFIG_IPV6) | |
493 | register_inet6addr_notifier(&nfsd_inet6addr_notifier); | |
494 | #endif | |
b9c0ef85 | 495 | do_gettimeofday(&nn->nfssvc_boot); /* record boot time */ |
87b0fc7d | 496 | return 0; |
02a375f0 N |
497 | } |
498 | ||
9dd9845f | 499 | int nfsd_nrpools(struct net *net) |
eed2965a | 500 | { |
9dd9845f SK |
501 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
502 | ||
503 | if (nn->nfsd_serv == NULL) | |
eed2965a GB |
504 | return 0; |
505 | else | |
9dd9845f | 506 | return nn->nfsd_serv->sv_nrpools; |
eed2965a GB |
507 | } |
508 | ||
9dd9845f | 509 | int nfsd_get_nrthreads(int n, int *nthreads, struct net *net) |
eed2965a GB |
510 | { |
511 | int i = 0; | |
9dd9845f | 512 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
eed2965a | 513 | |
9dd9845f SK |
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; | |
eed2965a GB |
517 | } |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
9dd9845f SK |
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 | ||
3938a0d5 | 534 | int nfsd_set_nrthreads(int n, int *nthreads, struct net *net) |
eed2965a GB |
535 | { |
536 | int i = 0; | |
537 | int tot = 0; | |
538 | int err = 0; | |
9dd9845f | 539 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
eed2965a | 540 | |
bedbdd8b NB |
541 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
542 | ||
9dd9845f | 543 | if (nn->nfsd_serv == NULL || n <= 0) |
eed2965a GB |
544 | return 0; |
545 | ||
9dd9845f SK |
546 | if (n > nn->nfsd_serv->sv_nrpools) |
547 | n = nn->nfsd_serv->sv_nrpools; | |
eed2965a GB |
548 | |
549 | /* enforce a global maximum number of threads */ | |
550 | tot = 0; | |
551 | for (i = 0; i < n; i++) { | |
3c7aa15d | 552 | nthreads[i] = min(nthreads[i], NFSD_MAXSERVS); |
eed2965a GB |
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 */ | |
9dd9845f | 576 | svc_get(nn->nfsd_serv); |
eed2965a | 577 | for (i = 0; i < n; i++) { |
598e2359 JL |
578 | err = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv, |
579 | &nn->nfsd_serv->sv_pools[i], nthreads[i]); | |
eed2965a GB |
580 | if (err) |
581 | break; | |
582 | } | |
19f7e2ca | 583 | nfsd_destroy(net); |
eed2965a GB |
584 | return err; |
585 | } | |
586 | ||
ac77efbe JL |
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 | */ | |
1da177e4 | 592 | int |
d41a9417 | 593 | nfsd_svc(int nrservs, struct net *net) |
1da177e4 LT |
594 | { |
595 | int error; | |
774f8bbd | 596 | bool nfsd_up_before; |
9dd9845f | 597 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
bedbdd8b NB |
598 | |
599 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 600 | dprintk("nfsd: creating service\n"); |
3c7aa15d KM |
601 | |
602 | nrservs = max(nrservs, 0); | |
603 | nrservs = min(nrservs, NFSD_MAXSERVS); | |
671e1fcf | 604 | error = 0; |
3c7aa15d | 605 | |
9dd9845f | 606 | if (nrservs == 0 && nn->nfsd_serv == NULL) |
671e1fcf N |
607 | goto out; |
608 | ||
6777436b | 609 | error = nfsd_create_serv(net); |
02a375f0 | 610 | if (error) |
774f8bbd BF |
611 | goto out; |
612 | ||
903d9bf0 | 613 | nfsd_up_before = nn->nfsd_net_up; |
774f8bbd | 614 | |
903d9bf0 | 615 | error = nfsd_startup_net(nrservs, net); |
af4718f3 BF |
616 | if (error) |
617 | goto out_destroy; | |
598e2359 JL |
618 | error = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv, |
619 | NULL, nrservs); | |
774f8bbd BF |
620 | if (error) |
621 | goto out_shutdown; | |
9dd9845f | 622 | /* We are holding a reference to nn->nfsd_serv which |
af4718f3 BF |
623 | * we don't want to count in the return value, |
624 | * so subtract 1 | |
625 | */ | |
9dd9845f | 626 | error = nn->nfsd_serv->sv_nrthreads - 1; |
4ad9a344 | 627 | out_shutdown: |
774f8bbd | 628 | if (error < 0 && !nfsd_up_before) |
541e864f | 629 | nfsd_shutdown_net(net); |
774f8bbd | 630 | out_destroy: |
19f7e2ca | 631 | nfsd_destroy(net); /* Release server */ |
4ad9a344 | 632 | out: |
bedbdd8b | 633 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
634 | return error; |
635 | } | |
636 | ||
1da177e4 LT |
637 | |
638 | /* | |
639 | * This is the NFS server kernel thread | |
640 | */ | |
9867d76c JL |
641 | static int |
642 | nfsd(void *vrqstp) | |
1da177e4 | 643 | { |
9867d76c | 644 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
88c47666 SK |
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; | |
5b8db00b | 647 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
5b444cc9 | 648 | int err; |
1da177e4 LT |
649 | |
650 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 651 | mutex_lock(&nfsd_mutex); |
1da177e4 | 652 | |
9867d76c | 653 | /* At this point, the thread shares current->fs |
1da177e4 LT |
654 | * with the init process. We need to create files with a |
655 | * umask of 0 instead of init's umask. */ | |
3e93cd67 | 656 | if (unshare_fs_struct() < 0) { |
1da177e4 LT |
657 | printk("Unable to start nfsd thread: out of memory\n"); |
658 | goto out; | |
659 | } | |
3e93cd67 | 660 | |
1da177e4 LT |
661 | current->fs->umask = 0; |
662 | ||
9867d76c JL |
663 | /* |
664 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
100766f8 | 665 | * the ones that will bring down the thread |
9867d76c | 666 | */ |
100766f8 JL |
667 | allow_signal(SIGKILL); |
668 | allow_signal(SIGHUP); | |
669 | allow_signal(SIGINT); | |
670 | allow_signal(SIGQUIT); | |
bedbdd8b | 671 | |
1da177e4 | 672 | nfsdstats.th_cnt++; |
bedbdd8b NB |
673 | mutex_unlock(&nfsd_mutex); |
674 | ||
83144186 | 675 | set_freezable(); |
1da177e4 LT |
676 | |
677 | /* | |
678 | * The main request loop | |
679 | */ | |
680 | for (;;) { | |
5b8db00b JL |
681 | /* Update sv_maxconn if it has changed */ |
682 | rqstp->rq_server->sv_maxconn = nn->max_connections; | |
683 | ||
1da177e4 LT |
684 | /* |
685 | * Find a socket with data available and call its | |
686 | * recvfrom routine. | |
687 | */ | |
6fb2b47f | 688 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 689 | ; |
9867d76c | 690 | if (err == -EINTR) |
1da177e4 | 691 | break; |
e0e81739 | 692 | validate_process_creds(); |
6fb2b47f | 693 | svc_process(rqstp); |
e0e81739 | 694 | validate_process_creds(); |
1da177e4 LT |
695 | } |
696 | ||
24e36663 | 697 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 698 | flush_signals(current); |
1da177e4 | 699 | |
bedbdd8b | 700 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
701 | nfsdstats.th_cnt --; |
702 | ||
703 | out: | |
57c8b13e | 704 | rqstp->rq_server = NULL; |
786185b5 | 705 | |
1da177e4 LT |
706 | /* Release the thread */ |
707 | svc_exit_thread(rqstp); | |
708 | ||
88c47666 | 709 | nfsd_destroy(net); |
57c8b13e | 710 | |
1da177e4 | 711 | /* Release module */ |
bedbdd8b | 712 | mutex_unlock(&nfsd_mutex); |
1da177e4 | 713 | module_put_and_exit(0); |
9867d76c | 714 | return 0; |
1da177e4 LT |
715 | } |
716 | ||
32c1eb0c AA |
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 | ||
1da177e4 | 726 | int |
c7afef1f | 727 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
728 | { |
729 | struct svc_procedure *proc; | |
730 | kxdrproc_t xdr; | |
ad451d38 AV |
731 | __be32 nfserr; |
732 | __be32 *nfserrp; | |
1da177e4 LT |
733 | |
734 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
735 | rqstp->rq_vers, rqstp->rq_proc); | |
736 | proc = rqstp->rq_procinfo; | |
737 | ||
1091006c BF |
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 | ||
1da177e4 | 752 | /* Check whether we have this call in the cache. */ |
1091006c | 753 | switch (nfsd_cache_lookup(rqstp)) { |
1da177e4 LT |
754 | case RC_DROPIT: |
755 | return 0; | |
756 | case RC_REPLY: | |
757 | return 1; | |
758 | case RC_DOIT:; | |
759 | /* do it */ | |
760 | } | |
761 | ||
1da177e4 LT |
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; | |
ad451d38 | 767 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
768 | |
769 | /* Now call the procedure handler, and encode NFS status. */ | |
770 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 771 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
78b65eb3 | 772 | if (nfserr == nfserr_dropit || test_bit(RQ_DROPME, &rqstp->rq_flags)) { |
45457e09 | 773 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
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. */ | |
57d276d7 | 797 | nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1); |
1da177e4 LT |
798 | return 1; |
799 | } | |
03cf6c9f GB |
800 | |
801 | int nfsd_pool_stats_open(struct inode *inode, struct file *file) | |
802 | { | |
ed2d8aed | 803 | int ret; |
11f77942 | 804 | struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id); |
9dd9845f | 805 | |
ed2d8aed | 806 | mutex_lock(&nfsd_mutex); |
9dd9845f | 807 | if (nn->nfsd_serv == NULL) { |
ed2d8aed | 808 | mutex_unlock(&nfsd_mutex); |
03cf6c9f | 809 | return -ENODEV; |
ed2d8aed RY |
810 | } |
811 | /* bump up the psudo refcount while traversing */ | |
9dd9845f SK |
812 | svc_get(nn->nfsd_serv); |
813 | ret = svc_pool_stats_open(nn->nfsd_serv, file); | |
ed2d8aed RY |
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); | |
11f77942 | 821 | struct net *net = inode->i_sb->s_fs_info; |
786185b5 | 822 | |
ed2d8aed RY |
823 | mutex_lock(&nfsd_mutex); |
824 | /* this function really, really should have been called svc_put() */ | |
19f7e2ca | 825 | nfsd_destroy(net); |
ed2d8aed RY |
826 | mutex_unlock(&nfsd_mutex); |
827 | return ret; | |
03cf6c9f | 828 | } |