Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * Central processing for nfsd. |
4 | * | |
5 | * Authors: Olaf Kirch (okir@monad.swb.de) | |
6 | * | |
7 | * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> | |
8 | */ | |
9 | ||
3f07c014 | 10 | #include <linux/sched/signal.h> |
83144186 | 11 | #include <linux/freezer.h> |
143cb494 | 12 | #include <linux/module.h> |
1da177e4 | 13 | #include <linux/fs_struct.h> |
c3d06f9c | 14 | #include <linux/swap.h> |
1da177e4 | 15 | |
1da177e4 | 16 | #include <linux/sunrpc/stats.h> |
1da177e4 | 17 | #include <linux/sunrpc/svcsock.h> |
36684996 | 18 | #include <linux/sunrpc/svc_xprt.h> |
1da177e4 | 19 | #include <linux/lockd/bind.h> |
a257cdd0 | 20 | #include <linux/nfsacl.h> |
ed2d8aed | 21 | #include <linux/seq_file.h> |
36684996 SM |
22 | #include <linux/inetdevice.h> |
23 | #include <net/addrconf.h> | |
24 | #include <net/ipv6.h> | |
fc5d00b0 | 25 | #include <net/net_namespace.h> |
9a74af21 BH |
26 | #include "nfsd.h" |
27 | #include "cache.h" | |
0a3adade | 28 | #include "vfs.h" |
2c2fe290 | 29 | #include "netns.h" |
65294c1f | 30 | #include "filecache.h" |
1da177e4 | 31 | |
0dfdad1c CL |
32 | #include "trace.h" |
33 | ||
1da177e4 LT |
34 | #define NFSDDBG_FACILITY NFSDDBG_SVC |
35 | ||
1da177e4 | 36 | extern struct svc_program nfsd_program; |
9867d76c | 37 | static int nfsd(void *vrqstp); |
029be5d0 TM |
38 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
39 | static int nfsd_acl_rpcbind_set(struct net *, | |
40 | const struct svc_program *, | |
41 | u32, int, | |
42 | unsigned short, | |
43 | unsigned short); | |
e333f3bb TM |
44 | static __be32 nfsd_acl_init_request(struct svc_rqst *, |
45 | const struct svc_program *, | |
46 | struct svc_process_info *); | |
029be5d0 TM |
47 | #endif |
48 | static int nfsd_rpcbind_set(struct net *, | |
49 | const struct svc_program *, | |
50 | u32, int, | |
51 | unsigned short, | |
52 | unsigned short); | |
e333f3bb TM |
53 | static __be32 nfsd_init_request(struct svc_rqst *, |
54 | const struct svc_program *, | |
55 | struct svc_process_info *); | |
1da177e4 | 56 | |
bedbdd8b | 57 | /* |
9dd9845f | 58 | * nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and the members |
bedbdd8b NB |
59 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some |
60 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt | |
61 | * | |
9dd9845f | 62 | * If (out side the lock) nn->nfsd_serv is non-NULL, then it must point to a |
bedbdd8b NB |
63 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number |
64 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each | |
65 | * entry of ->sv_pools[]. | |
66 | * | |
67 | * Transitions of the thread count between zero and non-zero are of particular | |
68 | * interest since the svc_serv needs to be created and initialized at that | |
69 | * point, or freed. | |
3dd98a3b JL |
70 | * |
71 | * Finally, the nfsd_mutex also protects some of the global variables that are | |
72 | * accessed when nfsd starts and that are settable via the write_* routines in | |
73 | * nfsctl.c. In particular: | |
74 | * | |
75 | * user_recovery_dirname | |
76 | * user_lease_time | |
77 | * nfsd_versions | |
bedbdd8b NB |
78 | */ |
79 | DEFINE_MUTEX(nfsd_mutex); | |
bedbdd8b | 80 | |
4bd9b0f4 AA |
81 | /* |
82 | * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used. | |
83 | * nfsd_drc_max_pages limits the total amount of memory available for | |
84 | * version 4.1 DRC caches. | |
85 | * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage. | |
86 | */ | |
b73ac680 | 87 | DEFINE_SPINLOCK(nfsd_drc_lock); |
697ce9be ZY |
88 | unsigned long nfsd_drc_max_mem; |
89 | unsigned long nfsd_drc_mem_used; | |
4bd9b0f4 | 90 | |
3fb803a9 AG |
91 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
92 | static struct svc_stat nfsd_acl_svcstats; | |
e9679189 | 93 | static const struct svc_version *nfsd_acl_version[] = { |
3fb803a9 AG |
94 | [2] = &nfsd_acl_version2, |
95 | [3] = &nfsd_acl_version3, | |
96 | }; | |
97 | ||
98 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 99 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
100 | |
101 | static struct svc_program nfsd_acl_program = { | |
102 | .pg_prog = NFS_ACL_PROGRAM, | |
103 | .pg_nvers = NFSD_ACL_NRVERS, | |
7c149057 | 104 | .pg_vers = nfsd_acl_version, |
1a8eff6d | 105 | .pg_name = "nfsacl", |
3fb803a9 AG |
106 | .pg_class = "nfsd", |
107 | .pg_stats = &nfsd_acl_svcstats, | |
108 | .pg_authenticate = &svc_set_client, | |
e333f3bb | 109 | .pg_init_request = nfsd_acl_init_request, |
029be5d0 | 110 | .pg_rpcbind_set = nfsd_acl_rpcbind_set, |
3fb803a9 AG |
111 | }; |
112 | ||
113 | static struct svc_stat nfsd_acl_svcstats = { | |
114 | .program = &nfsd_acl_program, | |
115 | }; | |
116 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
117 | ||
e9679189 | 118 | static const struct svc_version *nfsd_version[] = { |
70c3b76c N |
119 | [2] = &nfsd_version2, |
120 | #if defined(CONFIG_NFSD_V3) | |
121 | [3] = &nfsd_version3, | |
122 | #endif | |
123 | #if defined(CONFIG_NFSD_V4) | |
124 | [4] = &nfsd_version4, | |
125 | #endif | |
126 | }; | |
127 | ||
128 | #define NFSD_MINVERS 2 | |
e8c96f8c | 129 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
130 | |
131 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
132 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
133 | .pg_next = &nfsd_acl_program, | |
134 | #endif | |
70c3b76c N |
135 | .pg_prog = NFS_PROGRAM, /* program number */ |
136 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
e333f3bb | 137 | .pg_vers = nfsd_version, /* version table */ |
70c3b76c N |
138 | .pg_name = "nfsd", /* program name */ |
139 | .pg_class = "nfsd", /* authentication class */ | |
140 | .pg_stats = &nfsd_svcstats, /* version table */ | |
141 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
e333f3bb | 142 | .pg_init_request = nfsd_init_request, |
029be5d0 | 143 | .pg_rpcbind_set = nfsd_rpcbind_set, |
70c3b76c N |
144 | }; |
145 | ||
e333f3bb TM |
146 | static bool |
147 | nfsd_support_version(int vers) | |
148 | { | |
149 | if (vers >= NFSD_MINVERS && vers < NFSD_NRVERS) | |
150 | return nfsd_version[vers] != NULL; | |
151 | return false; | |
152 | } | |
153 | ||
154 | static bool * | |
155 | nfsd_alloc_versions(void) | |
156 | { | |
157 | bool *vers = kmalloc_array(NFSD_NRVERS, sizeof(bool), GFP_KERNEL); | |
158 | unsigned i; | |
159 | ||
160 | if (vers) { | |
161 | /* All compiled versions are enabled by default */ | |
162 | for (i = 0; i < NFSD_NRVERS; i++) | |
163 | vers[i] = nfsd_support_version(i); | |
164 | } | |
165 | return vers; | |
166 | } | |
167 | ||
168 | static bool * | |
169 | nfsd_alloc_minorversions(void) | |
170 | { | |
171 | bool *vers = kmalloc_array(NFSD_SUPPORTED_MINOR_VERSION + 1, | |
172 | sizeof(bool), GFP_KERNEL); | |
173 | unsigned i; | |
8daf220a | 174 | |
e333f3bb TM |
175 | if (vers) { |
176 | /* All minor versions are enabled by default */ | |
177 | for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++) | |
178 | vers[i] = nfsd_support_version(4); | |
179 | } | |
180 | return vers; | |
181 | } | |
182 | ||
183 | void | |
184 | nfsd_netns_free_versions(struct nfsd_net *nn) | |
185 | { | |
186 | kfree(nn->nfsd_versions); | |
187 | kfree(nn->nfsd4_minorversions); | |
188 | nn->nfsd_versions = NULL; | |
189 | nn->nfsd4_minorversions = NULL; | |
190 | } | |
191 | ||
192 | static void | |
193 | nfsd_netns_init_versions(struct nfsd_net *nn) | |
194 | { | |
195 | if (!nn->nfsd_versions) { | |
196 | nn->nfsd_versions = nfsd_alloc_versions(); | |
197 | nn->nfsd4_minorversions = nfsd_alloc_minorversions(); | |
198 | if (!nn->nfsd_versions || !nn->nfsd4_minorversions) | |
199 | nfsd_netns_free_versions(nn); | |
200 | } | |
201 | } | |
202 | ||
203 | int nfsd_vers(struct nfsd_net *nn, int vers, enum vers_op change) | |
6658d3a7 N |
204 | { |
205 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
15ddb4ae | 206 | return 0; |
6658d3a7 N |
207 | switch(change) { |
208 | case NFSD_SET: | |
e333f3bb TM |
209 | if (nn->nfsd_versions) |
210 | nn->nfsd_versions[vers] = nfsd_support_version(vers); | |
1a8eff6d | 211 | break; |
6658d3a7 | 212 | case NFSD_CLEAR: |
e333f3bb TM |
213 | nfsd_netns_init_versions(nn); |
214 | if (nn->nfsd_versions) | |
215 | nn->nfsd_versions[vers] = false; | |
6658d3a7 N |
216 | break; |
217 | case NFSD_TEST: | |
e333f3bb TM |
218 | if (nn->nfsd_versions) |
219 | return nn->nfsd_versions[vers]; | |
df561f66 | 220 | fallthrough; |
6658d3a7 | 221 | case NFSD_AVAIL: |
e333f3bb | 222 | return nfsd_support_version(vers); |
6658d3a7 N |
223 | } |
224 | return 0; | |
225 | } | |
8daf220a | 226 | |
d3635ff0 | 227 | static void |
e333f3bb | 228 | nfsd_adjust_nfsd_versions4(struct nfsd_net *nn) |
d3635ff0 TM |
229 | { |
230 | unsigned i; | |
231 | ||
232 | for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++) { | |
e333f3bb | 233 | if (nn->nfsd4_minorversions[i]) |
d3635ff0 TM |
234 | return; |
235 | } | |
e333f3bb | 236 | nfsd_vers(nn, 4, NFSD_CLEAR); |
d3635ff0 TM |
237 | } |
238 | ||
e333f3bb | 239 | int nfsd_minorversion(struct nfsd_net *nn, u32 minorversion, enum vers_op change) |
8daf220a | 240 | { |
928c6fb3 N |
241 | if (minorversion > NFSD_SUPPORTED_MINOR_VERSION && |
242 | change != NFSD_AVAIL) | |
8daf220a | 243 | return -1; |
e333f3bb | 244 | |
8daf220a BH |
245 | switch(change) { |
246 | case NFSD_SET: | |
e333f3bb TM |
247 | if (nn->nfsd4_minorversions) { |
248 | nfsd_vers(nn, 4, NFSD_SET); | |
249 | nn->nfsd4_minorversions[minorversion] = | |
250 | nfsd_vers(nn, 4, NFSD_TEST); | |
251 | } | |
8daf220a BH |
252 | break; |
253 | case NFSD_CLEAR: | |
e333f3bb TM |
254 | nfsd_netns_init_versions(nn); |
255 | if (nn->nfsd4_minorversions) { | |
256 | nn->nfsd4_minorversions[minorversion] = false; | |
257 | nfsd_adjust_nfsd_versions4(nn); | |
258 | } | |
8daf220a BH |
259 | break; |
260 | case NFSD_TEST: | |
e333f3bb TM |
261 | if (nn->nfsd4_minorversions) |
262 | return nn->nfsd4_minorversions[minorversion]; | |
263 | return nfsd_vers(nn, 4, NFSD_TEST); | |
8daf220a | 264 | case NFSD_AVAIL: |
e333f3bb TM |
265 | return minorversion <= NFSD_SUPPORTED_MINOR_VERSION && |
266 | nfsd_vers(nn, 4, NFSD_AVAIL); | |
8daf220a BH |
267 | } |
268 | return 0; | |
269 | } | |
270 | ||
1da177e4 LT |
271 | /* |
272 | * Maximum number of nfsd processes | |
273 | */ | |
274 | #define NFSD_MAXSERVS 8192 | |
275 | ||
9dd9845f | 276 | int nfsd_nrthreads(struct net *net) |
1da177e4 | 277 | { |
c7d106c9 | 278 | int rv = 0; |
9dd9845f SK |
279 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
280 | ||
c7d106c9 | 281 | mutex_lock(&nfsd_mutex); |
9dd9845f SK |
282 | if (nn->nfsd_serv) |
283 | rv = nn->nfsd_serv->sv_nrthreads; | |
c7d106c9 NB |
284 | mutex_unlock(&nfsd_mutex); |
285 | return rv; | |
1da177e4 LT |
286 | } |
287 | ||
4df493a2 | 288 | static int nfsd_init_socks(struct net *net, const struct cred *cred) |
59db4a0c BF |
289 | { |
290 | int error; | |
9dd9845f SK |
291 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
292 | ||
293 | if (!list_empty(&nn->nfsd_serv->sv_permsocks)) | |
59db4a0c BF |
294 | return 0; |
295 | ||
9dd9845f | 296 | error = svc_create_xprt(nn->nfsd_serv, "udp", net, PF_INET, NFS_PORT, |
4df493a2 | 297 | SVC_SOCK_DEFAULTS, cred); |
59db4a0c BF |
298 | if (error < 0) |
299 | return error; | |
300 | ||
9dd9845f | 301 | error = svc_create_xprt(nn->nfsd_serv, "tcp", net, PF_INET, NFS_PORT, |
4df493a2 | 302 | SVC_SOCK_DEFAULTS, cred); |
59db4a0c BF |
303 | if (error < 0) |
304 | return error; | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
4539f149 | 309 | static int nfsd_users = 0; |
4ad9a344 | 310 | |
70c53075 | 311 | static int nfsd_startup_generic(void) |
bda9cac1 SK |
312 | { |
313 | int ret; | |
314 | ||
4539f149 | 315 | if (nfsd_users++) |
bda9cac1 SK |
316 | return 0; |
317 | ||
65294c1f JL |
318 | ret = nfsd_file_cache_init(); |
319 | if (ret) | |
320 | goto dec_users; | |
d9499a95 | 321 | |
bda9cac1 SK |
322 | ret = nfs4_state_start(); |
323 | if (ret) | |
501cb184 | 324 | goto out_file_cache; |
bda9cac1 SK |
325 | return 0; |
326 | ||
65294c1f JL |
327 | out_file_cache: |
328 | nfsd_file_cache_shutdown(); | |
d9499a95 KM |
329 | dec_users: |
330 | nfsd_users--; | |
bda9cac1 SK |
331 | return ret; |
332 | } | |
333 | ||
334 | static void nfsd_shutdown_generic(void) | |
335 | { | |
4539f149 SK |
336 | if (--nfsd_users) |
337 | return; | |
338 | ||
bda9cac1 | 339 | nfs4_state_shutdown(); |
65294c1f | 340 | nfsd_file_cache_shutdown(); |
bda9cac1 SK |
341 | } |
342 | ||
e333f3bb | 343 | static bool nfsd_needs_lockd(struct nfsd_net *nn) |
8ef66714 | 344 | { |
e333f3bb | 345 | return nfsd_vers(nn, 2, NFSD_TEST) || nfsd_vers(nn, 3, NFSD_TEST); |
8ef66714 KM |
346 | } |
347 | ||
27c438f5 TM |
348 | void nfsd_copy_boot_verifier(__be32 verf[2], struct nfsd_net *nn) |
349 | { | |
350 | int seq = 0; | |
351 | ||
352 | do { | |
353 | read_seqbegin_or_lock(&nn->boot_lock, &seq); | |
354 | /* | |
355 | * This is opaque to client, so no need to byte-swap. Use | |
356 | * __force to keep sparse happy. y2038 time_t overflow is | |
357 | * irrelevant in this usage | |
358 | */ | |
359 | verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec; | |
360 | verf[1] = (__force __be32)nn->nfssvc_boot.tv_nsec; | |
361 | } while (need_seqretry(&nn->boot_lock, seq)); | |
362 | done_seqretry(&nn->boot_lock, seq); | |
363 | } | |
364 | ||
65643f4c | 365 | static void nfsd_reset_boot_verifier_locked(struct nfsd_net *nn) |
27c438f5 TM |
366 | { |
367 | ktime_get_real_ts64(&nn->nfssvc_boot); | |
368 | } | |
369 | ||
370 | void nfsd_reset_boot_verifier(struct nfsd_net *nn) | |
371 | { | |
372 | write_seqlock(&nn->boot_lock); | |
373 | nfsd_reset_boot_verifier_locked(nn); | |
374 | write_sequnlock(&nn->boot_lock); | |
375 | } | |
376 | ||
70c53075 | 377 | static int nfsd_startup_net(struct net *net, const struct cred *cred) |
6ff50b3d | 378 | { |
2c2fe290 | 379 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
6ff50b3d SK |
380 | int ret; |
381 | ||
2c2fe290 SK |
382 | if (nn->nfsd_net_up) |
383 | return 0; | |
384 | ||
70c53075 | 385 | ret = nfsd_startup_generic(); |
6ff50b3d SK |
386 | if (ret) |
387 | return ret; | |
4df493a2 | 388 | ret = nfsd_init_socks(net, cred); |
903d9bf0 SK |
389 | if (ret) |
390 | goto out_socks; | |
8ef66714 | 391 | |
e333f3bb | 392 | if (nfsd_needs_lockd(nn) && !nn->lockd_up) { |
40373b12 | 393 | ret = lockd_up(net, cred); |
8ef66714 KM |
394 | if (ret) |
395 | goto out_socks; | |
e44b4bf2 | 396 | nn->lockd_up = true; |
8ef66714 KM |
397 | } |
398 | ||
9542e6a6 | 399 | ret = nfsd_file_cache_start_net(net); |
6ff50b3d SK |
400 | if (ret) |
401 | goto out_lockd; | |
9542e6a6 TM |
402 | ret = nfs4_state_start_net(net); |
403 | if (ret) | |
404 | goto out_filecache; | |
6ff50b3d | 405 | |
f4e44b39 DN |
406 | #ifdef CONFIG_NFSD_V4_2_INTER_SSC |
407 | nfsd4_ssc_init_umount_work(nn); | |
408 | #endif | |
2c2fe290 | 409 | nn->nfsd_net_up = true; |
6ff50b3d SK |
410 | return 0; |
411 | ||
9542e6a6 TM |
412 | out_filecache: |
413 | nfsd_file_cache_shutdown_net(net); | |
6ff50b3d | 414 | out_lockd: |
8ef66714 KM |
415 | if (nn->lockd_up) { |
416 | lockd_down(net); | |
e44b4bf2 | 417 | nn->lockd_up = false; |
8ef66714 | 418 | } |
903d9bf0 | 419 | out_socks: |
bda9cac1 | 420 | nfsd_shutdown_generic(); |
4ad9a344 JL |
421 | return ret; |
422 | } | |
423 | ||
6ff50b3d SK |
424 | static void nfsd_shutdown_net(struct net *net) |
425 | { | |
2c2fe290 SK |
426 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
427 | ||
9542e6a6 | 428 | nfsd_file_cache_shutdown_net(net); |
6ff50b3d | 429 | nfs4_state_shutdown_net(net); |
8ef66714 KM |
430 | if (nn->lockd_up) { |
431 | lockd_down(net); | |
e44b4bf2 | 432 | nn->lockd_up = false; |
8ef66714 | 433 | } |
2c2fe290 | 434 | nn->nfsd_net_up = false; |
903d9bf0 | 435 | nfsd_shutdown_generic(); |
6ff50b3d SK |
436 | } |
437 | ||
36684996 SM |
438 | static int nfsd_inetaddr_event(struct notifier_block *this, unsigned long event, |
439 | void *ptr) | |
440 | { | |
441 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; | |
442 | struct net_device *dev = ifa->ifa_dev->dev; | |
443 | struct net *net = dev_net(dev); | |
444 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
445 | struct sockaddr_in sin; | |
446 | ||
2317dc55 VA |
447 | if ((event != NETDEV_DOWN) || |
448 | !atomic_inc_not_zero(&nn->ntf_refcnt)) | |
36684996 SM |
449 | goto out; |
450 | ||
451 | if (nn->nfsd_serv) { | |
452 | dprintk("nfsd_inetaddr_event: removed %pI4\n", &ifa->ifa_local); | |
453 | sin.sin_family = AF_INET; | |
454 | sin.sin_addr.s_addr = ifa->ifa_local; | |
455 | svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin); | |
456 | } | |
2317dc55 VA |
457 | atomic_dec(&nn->ntf_refcnt); |
458 | wake_up(&nn->ntf_wq); | |
36684996 SM |
459 | |
460 | out: | |
461 | return NOTIFY_DONE; | |
462 | } | |
463 | ||
464 | static struct notifier_block nfsd_inetaddr_notifier = { | |
465 | .notifier_call = nfsd_inetaddr_event, | |
466 | }; | |
467 | ||
468 | #if IS_ENABLED(CONFIG_IPV6) | |
469 | static int nfsd_inet6addr_event(struct notifier_block *this, | |
470 | unsigned long event, void *ptr) | |
471 | { | |
472 | struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; | |
473 | struct net_device *dev = ifa->idev->dev; | |
474 | struct net *net = dev_net(dev); | |
475 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
476 | struct sockaddr_in6 sin6; | |
477 | ||
2317dc55 VA |
478 | if ((event != NETDEV_DOWN) || |
479 | !atomic_inc_not_zero(&nn->ntf_refcnt)) | |
36684996 SM |
480 | goto out; |
481 | ||
482 | if (nn->nfsd_serv) { | |
483 | dprintk("nfsd_inet6addr_event: removed %pI6\n", &ifa->addr); | |
484 | sin6.sin6_family = AF_INET6; | |
485 | sin6.sin6_addr = ifa->addr; | |
7b19824d SM |
486 | if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL) |
487 | sin6.sin6_scope_id = ifa->idev->dev->ifindex; | |
36684996 SM |
488 | svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin6); |
489 | } | |
2317dc55 VA |
490 | atomic_dec(&nn->ntf_refcnt); |
491 | wake_up(&nn->ntf_wq); | |
36684996 SM |
492 | out: |
493 | return NOTIFY_DONE; | |
494 | } | |
495 | ||
496 | static struct notifier_block nfsd_inet6addr_notifier = { | |
497 | .notifier_call = nfsd_inet6addr_event, | |
498 | }; | |
499 | #endif | |
500 | ||
1eca45f8 VA |
501 | /* Only used under nfsd_mutex, so this atomic may be overkill: */ |
502 | static atomic_t nfsd_notifier_refcount = ATOMIC_INIT(0); | |
503 | ||
541e864f | 504 | static void nfsd_last_thread(struct svc_serv *serv, struct net *net) |
4ad9a344 | 505 | { |
903d9bf0 SK |
506 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
507 | ||
2317dc55 | 508 | atomic_dec(&nn->ntf_refcnt); |
1eca45f8 VA |
509 | /* check if the notifier still has clients */ |
510 | if (atomic_dec_return(&nfsd_notifier_refcount) == 0) { | |
511 | unregister_inetaddr_notifier(&nfsd_inetaddr_notifier); | |
36684996 | 512 | #if IS_ENABLED(CONFIG_IPV6) |
1eca45f8 | 513 | unregister_inet6addr_notifier(&nfsd_inet6addr_notifier); |
36684996 | 514 | #endif |
1eca45f8 | 515 | } |
2317dc55 | 516 | wait_event(nn->ntf_wq, atomic_read(&nn->ntf_refcnt) == 0); |
1eca45f8 | 517 | |
4ad9a344 JL |
518 | /* |
519 | * write_ports can create the server without actually starting | |
520 | * any threads--if we get shut down before any threads are | |
521 | * started, then nfsd_last_thread will be run before any of this | |
691412b4 | 522 | * other initialization has been done except the rpcb information. |
4ad9a344 | 523 | */ |
691412b4 | 524 | svc_rpcb_cleanup(serv, net); |
903d9bf0 | 525 | if (!nn->nfsd_net_up) |
4ad9a344 | 526 | return; |
16d05870 | 527 | |
691412b4 | 528 | nfsd_shutdown_net(net); |
4420440c | 529 | pr_info("nfsd: last server has exited, flushing export cache\n"); |
b3853e0e | 530 | nfsd_export_flush(net); |
bc591ccf | 531 | } |
6658d3a7 | 532 | |
e333f3bb | 533 | void nfsd_reset_versions(struct nfsd_net *nn) |
6658d3a7 | 534 | { |
6658d3a7 N |
535 | int i; |
536 | ||
800a938f | 537 | for (i = 0; i < NFSD_NRVERS; i++) |
e333f3bb | 538 | if (nfsd_vers(nn, i, NFSD_TEST)) |
800a938f | 539 | return; |
6658d3a7 | 540 | |
800a938f N |
541 | for (i = 0; i < NFSD_NRVERS; i++) |
542 | if (i != 4) | |
e333f3bb | 543 | nfsd_vers(nn, i, NFSD_SET); |
800a938f N |
544 | else { |
545 | int minor = 0; | |
e333f3bb | 546 | while (nfsd_minorversion(nn, minor, NFSD_SET) >= 0) |
800a938f N |
547 | minor++; |
548 | } | |
6658d3a7 N |
549 | } |
550 | ||
c3d06f9c AA |
551 | /* |
552 | * Each session guarantees a negotiated per slot memory cache for replies | |
553 | * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated | |
554 | * NFSv4.1 server might want to use more memory for a DRC than a machine | |
555 | * with mutiple services. | |
556 | * | |
557 | * Impose a hard limit on the number of pages for the DRC which varies | |
558 | * according to the machines free pages. This is of course only a default. | |
559 | * | |
560 | * For now this is a #defined shift which could be under admin control | |
561 | * in the future. | |
562 | */ | |
563 | static void set_max_drc(void) | |
564 | { | |
44d8660d | 565 | #define NFSD_DRC_SIZE_SHIFT 7 |
0c193054 AA |
566 | nfsd_drc_max_mem = (nr_free_buffer_pages() |
567 | >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; | |
568 | nfsd_drc_mem_used = 0; | |
697ce9be | 569 | dprintk("%s nfsd_drc_max_mem %lu \n", __func__, nfsd_drc_max_mem); |
c3d06f9c | 570 | } |
bedbdd8b | 571 | |
87b0fc7d | 572 | static int nfsd_get_default_max_blksize(void) |
02a375f0 | 573 | { |
87b0fc7d BF |
574 | struct sysinfo i; |
575 | unsigned long long target; | |
576 | unsigned long ret; | |
bedbdd8b | 577 | |
87b0fc7d | 578 | si_meminfo(&i); |
508f9227 | 579 | target = (i.totalram - i.totalhigh) << PAGE_SHIFT; |
87b0fc7d BF |
580 | /* |
581 | * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig | |
582 | * machines, but only uses 32K on 128M machines. Bottom out at | |
583 | * 8K on 32M and smaller. Of course, this is only a default. | |
584 | */ | |
585 | target >>= 12; | |
586 | ||
587 | ret = NFSSVC_MAXBLKSIZE; | |
588 | while (ret > target && ret >= 8*1024*2) | |
589 | ret /= 2; | |
590 | return ret; | |
591 | } | |
592 | ||
afea5657 | 593 | static const struct svc_serv_ops nfsd_thread_sv_ops = { |
b9e13cdf JL |
594 | .svo_shutdown = nfsd_last_thread, |
595 | .svo_function = nfsd, | |
596 | .svo_enqueue_xprt = svc_xprt_do_enqueue, | |
598e2359 | 597 | .svo_setup = svc_set_num_threads, |
b9e13cdf | 598 | .svo_module = THIS_MODULE, |
ea126e74 JL |
599 | }; |
600 | ||
c6c7f2a8 TM |
601 | static void nfsd_complete_shutdown(struct net *net) |
602 | { | |
603 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
604 | ||
605 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); | |
606 | ||
607 | nn->nfsd_serv = NULL; | |
608 | complete(&nn->nfsd_shutdown_complete); | |
609 | } | |
610 | ||
611 | void nfsd_shutdown_threads(struct net *net) | |
612 | { | |
613 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
614 | struct svc_serv *serv; | |
615 | ||
616 | mutex_lock(&nfsd_mutex); | |
617 | serv = nn->nfsd_serv; | |
618 | if (serv == NULL) { | |
619 | mutex_unlock(&nfsd_mutex); | |
620 | return; | |
621 | } | |
622 | ||
623 | svc_get(serv); | |
624 | /* Kill outstanding nfsd threads */ | |
625 | serv->sv_ops->svo_setup(serv, NULL, 0); | |
626 | nfsd_destroy(net); | |
627 | mutex_unlock(&nfsd_mutex); | |
628 | /* Wait for shutdown of nfsd_serv to complete */ | |
629 | wait_for_completion(&nn->nfsd_shutdown_complete); | |
630 | } | |
631 | ||
44fb26c6 | 632 | bool i_am_nfsd(void) |
28df3d15 BF |
633 | { |
634 | return kthread_func(current) == nfsd; | |
635 | } | |
636 | ||
6777436b | 637 | int nfsd_create_serv(struct net *net) |
87b0fc7d | 638 | { |
9793f7c8 | 639 | int error; |
b9c0ef85 | 640 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
9793f7c8 | 641 | |
bedbdd8b | 642 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
9dd9845f SK |
643 | if (nn->nfsd_serv) { |
644 | svc_get(nn->nfsd_serv); | |
02a375f0 N |
645 | return 0; |
646 | } | |
87b0fc7d BF |
647 | if (nfsd_max_blksize == 0) |
648 | nfsd_max_blksize = nfsd_get_default_max_blksize(); | |
e333f3bb | 649 | nfsd_reset_versions(nn); |
9dd9845f | 650 | nn->nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
b9e13cdf | 651 | &nfsd_thread_sv_ops); |
9dd9845f | 652 | if (nn->nfsd_serv == NULL) |
628b3687 | 653 | return -ENOMEM; |
c6c7f2a8 | 654 | init_completion(&nn->nfsd_shutdown_complete); |
bedbdd8b | 655 | |
5b8db00b | 656 | nn->nfsd_serv->sv_maxconn = nn->max_connections; |
9dd9845f | 657 | error = svc_bind(nn->nfsd_serv, net); |
9793f7c8 | 658 | if (error < 0) { |
9dd9845f | 659 | svc_destroy(nn->nfsd_serv); |
c6c7f2a8 | 660 | nfsd_complete_shutdown(net); |
9793f7c8 SK |
661 | return error; |
662 | } | |
663 | ||
628b3687 | 664 | set_max_drc(); |
1eca45f8 VA |
665 | /* check if the notifier is already set */ |
666 | if (atomic_inc_return(&nfsd_notifier_refcount) == 1) { | |
667 | register_inetaddr_notifier(&nfsd_inetaddr_notifier); | |
36684996 | 668 | #if IS_ENABLED(CONFIG_IPV6) |
1eca45f8 | 669 | register_inet6addr_notifier(&nfsd_inet6addr_notifier); |
36684996 | 670 | #endif |
1eca45f8 | 671 | } |
2317dc55 | 672 | atomic_inc(&nn->ntf_refcnt); |
27c438f5 | 673 | nfsd_reset_boot_verifier(nn); |
87b0fc7d | 674 | return 0; |
02a375f0 N |
675 | } |
676 | ||
9dd9845f | 677 | int nfsd_nrpools(struct net *net) |
eed2965a | 678 | { |
9dd9845f SK |
679 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
680 | ||
681 | if (nn->nfsd_serv == NULL) | |
eed2965a GB |
682 | return 0; |
683 | else | |
9dd9845f | 684 | return nn->nfsd_serv->sv_nrpools; |
eed2965a GB |
685 | } |
686 | ||
9dd9845f | 687 | int nfsd_get_nrthreads(int n, int *nthreads, struct net *net) |
eed2965a GB |
688 | { |
689 | int i = 0; | |
9dd9845f | 690 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
eed2965a | 691 | |
9dd9845f SK |
692 | if (nn->nfsd_serv != NULL) { |
693 | for (i = 0; i < nn->nfsd_serv->sv_nrpools && i < n; i++) | |
694 | nthreads[i] = nn->nfsd_serv->sv_pools[i].sp_nrthreads; | |
eed2965a GB |
695 | } |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
9dd9845f SK |
700 | void nfsd_destroy(struct net *net) |
701 | { | |
702 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
703 | int destroy = (nn->nfsd_serv->sv_nrthreads == 1); | |
704 | ||
705 | if (destroy) | |
706 | svc_shutdown_net(nn->nfsd_serv, net); | |
707 | svc_destroy(nn->nfsd_serv); | |
708 | if (destroy) | |
c6c7f2a8 | 709 | nfsd_complete_shutdown(net); |
9dd9845f SK |
710 | } |
711 | ||
3938a0d5 | 712 | int nfsd_set_nrthreads(int n, int *nthreads, struct net *net) |
eed2965a GB |
713 | { |
714 | int i = 0; | |
715 | int tot = 0; | |
716 | int err = 0; | |
9dd9845f | 717 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
eed2965a | 718 | |
bedbdd8b NB |
719 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
720 | ||
9dd9845f | 721 | if (nn->nfsd_serv == NULL || n <= 0) |
eed2965a GB |
722 | return 0; |
723 | ||
9dd9845f SK |
724 | if (n > nn->nfsd_serv->sv_nrpools) |
725 | n = nn->nfsd_serv->sv_nrpools; | |
eed2965a GB |
726 | |
727 | /* enforce a global maximum number of threads */ | |
728 | tot = 0; | |
729 | for (i = 0; i < n; i++) { | |
3c7aa15d | 730 | nthreads[i] = min(nthreads[i], NFSD_MAXSERVS); |
eed2965a GB |
731 | tot += nthreads[i]; |
732 | } | |
733 | if (tot > NFSD_MAXSERVS) { | |
734 | /* total too large: scale down requested numbers */ | |
735 | for (i = 0; i < n && tot > 0; i++) { | |
736 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
737 | tot -= (nthreads[i] - new); | |
738 | nthreads[i] = new; | |
739 | } | |
740 | for (i = 0; i < n && tot > 0; i++) { | |
741 | nthreads[i]--; | |
742 | tot--; | |
743 | } | |
744 | } | |
745 | ||
746 | /* | |
747 | * There must always be a thread in pool 0; the admin | |
748 | * can't shut down NFS completely using pool_threads. | |
749 | */ | |
750 | if (nthreads[0] == 0) | |
751 | nthreads[0] = 1; | |
752 | ||
753 | /* apply the new numbers */ | |
9dd9845f | 754 | svc_get(nn->nfsd_serv); |
eed2965a | 755 | for (i = 0; i < n; i++) { |
598e2359 JL |
756 | err = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv, |
757 | &nn->nfsd_serv->sv_pools[i], nthreads[i]); | |
eed2965a GB |
758 | if (err) |
759 | break; | |
760 | } | |
19f7e2ca | 761 | nfsd_destroy(net); |
eed2965a GB |
762 | return err; |
763 | } | |
764 | ||
ac77efbe JL |
765 | /* |
766 | * Adjust the number of threads and return the new number of threads. | |
767 | * This is also the function that starts the server if necessary, if | |
768 | * this is the first time nrservs is nonzero. | |
769 | */ | |
1da177e4 | 770 | int |
4df493a2 | 771 | nfsd_svc(int nrservs, struct net *net, const struct cred *cred) |
1da177e4 LT |
772 | { |
773 | int error; | |
774f8bbd | 774 | bool nfsd_up_before; |
9dd9845f | 775 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
bedbdd8b NB |
776 | |
777 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 778 | dprintk("nfsd: creating service\n"); |
3c7aa15d KM |
779 | |
780 | nrservs = max(nrservs, 0); | |
781 | nrservs = min(nrservs, NFSD_MAXSERVS); | |
671e1fcf | 782 | error = 0; |
3c7aa15d | 783 | |
9dd9845f | 784 | if (nrservs == 0 && nn->nfsd_serv == NULL) |
671e1fcf N |
785 | goto out; |
786 | ||
7627d7dc SM |
787 | strlcpy(nn->nfsd_name, utsname()->nodename, |
788 | sizeof(nn->nfsd_name)); | |
789 | ||
6777436b | 790 | error = nfsd_create_serv(net); |
02a375f0 | 791 | if (error) |
774f8bbd BF |
792 | goto out; |
793 | ||
903d9bf0 | 794 | nfsd_up_before = nn->nfsd_net_up; |
774f8bbd | 795 | |
70c53075 | 796 | error = nfsd_startup_net(net, cred); |
af4718f3 BF |
797 | if (error) |
798 | goto out_destroy; | |
598e2359 JL |
799 | error = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv, |
800 | NULL, nrservs); | |
774f8bbd BF |
801 | if (error) |
802 | goto out_shutdown; | |
9dd9845f | 803 | /* We are holding a reference to nn->nfsd_serv which |
af4718f3 BF |
804 | * we don't want to count in the return value, |
805 | * so subtract 1 | |
806 | */ | |
9dd9845f | 807 | error = nn->nfsd_serv->sv_nrthreads - 1; |
4ad9a344 | 808 | out_shutdown: |
774f8bbd | 809 | if (error < 0 && !nfsd_up_before) |
541e864f | 810 | nfsd_shutdown_net(net); |
774f8bbd | 811 | out_destroy: |
19f7e2ca | 812 | nfsd_destroy(net); /* Release server */ |
4ad9a344 | 813 | out: |
bedbdd8b | 814 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
815 | return error; |
816 | } | |
817 | ||
029be5d0 TM |
818 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
819 | static bool | |
820 | nfsd_support_acl_version(int vers) | |
821 | { | |
822 | if (vers >= NFSD_ACL_MINVERS && vers < NFSD_ACL_NRVERS) | |
823 | return nfsd_acl_version[vers] != NULL; | |
824 | return false; | |
825 | } | |
826 | ||
827 | static int | |
828 | nfsd_acl_rpcbind_set(struct net *net, const struct svc_program *progp, | |
829 | u32 version, int family, unsigned short proto, | |
830 | unsigned short port) | |
831 | { | |
832 | if (!nfsd_support_acl_version(version) || | |
e333f3bb | 833 | !nfsd_vers(net_generic(net, nfsd_net_id), version, NFSD_TEST)) |
029be5d0 TM |
834 | return 0; |
835 | return svc_generic_rpcbind_set(net, progp, version, family, | |
836 | proto, port); | |
837 | } | |
e333f3bb TM |
838 | |
839 | static __be32 | |
840 | nfsd_acl_init_request(struct svc_rqst *rqstp, | |
841 | const struct svc_program *progp, | |
842 | struct svc_process_info *ret) | |
843 | { | |
844 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
845 | int i; | |
846 | ||
847 | if (likely(nfsd_support_acl_version(rqstp->rq_vers) && | |
848 | nfsd_vers(nn, rqstp->rq_vers, NFSD_TEST))) | |
849 | return svc_generic_init_request(rqstp, progp, ret); | |
850 | ||
851 | ret->mismatch.lovers = NFSD_ACL_NRVERS; | |
852 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) { | |
853 | if (nfsd_support_acl_version(rqstp->rq_vers) && | |
854 | nfsd_vers(nn, i, NFSD_TEST)) { | |
855 | ret->mismatch.lovers = i; | |
856 | break; | |
857 | } | |
858 | } | |
859 | if (ret->mismatch.lovers == NFSD_ACL_NRVERS) | |
860 | return rpc_prog_unavail; | |
861 | ret->mismatch.hivers = NFSD_ACL_MINVERS; | |
862 | for (i = NFSD_ACL_NRVERS - 1; i >= NFSD_ACL_MINVERS; i--) { | |
863 | if (nfsd_support_acl_version(rqstp->rq_vers) && | |
864 | nfsd_vers(nn, i, NFSD_TEST)) { | |
865 | ret->mismatch.hivers = i; | |
866 | break; | |
867 | } | |
868 | } | |
869 | return rpc_prog_mismatch; | |
870 | } | |
029be5d0 TM |
871 | #endif |
872 | ||
873 | static int | |
874 | nfsd_rpcbind_set(struct net *net, const struct svc_program *progp, | |
875 | u32 version, int family, unsigned short proto, | |
876 | unsigned short port) | |
877 | { | |
e333f3bb | 878 | if (!nfsd_vers(net_generic(net, nfsd_net_id), version, NFSD_TEST)) |
029be5d0 TM |
879 | return 0; |
880 | return svc_generic_rpcbind_set(net, progp, version, family, | |
881 | proto, port); | |
882 | } | |
1da177e4 | 883 | |
e333f3bb TM |
884 | static __be32 |
885 | nfsd_init_request(struct svc_rqst *rqstp, | |
886 | const struct svc_program *progp, | |
887 | struct svc_process_info *ret) | |
888 | { | |
889 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
890 | int i; | |
891 | ||
892 | if (likely(nfsd_vers(nn, rqstp->rq_vers, NFSD_TEST))) | |
893 | return svc_generic_init_request(rqstp, progp, ret); | |
894 | ||
895 | ret->mismatch.lovers = NFSD_NRVERS; | |
896 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
897 | if (nfsd_vers(nn, i, NFSD_TEST)) { | |
898 | ret->mismatch.lovers = i; | |
899 | break; | |
900 | } | |
901 | } | |
902 | if (ret->mismatch.lovers == NFSD_NRVERS) | |
903 | return rpc_prog_unavail; | |
904 | ret->mismatch.hivers = NFSD_MINVERS; | |
905 | for (i = NFSD_NRVERS - 1; i >= NFSD_MINVERS; i--) { | |
906 | if (nfsd_vers(nn, i, NFSD_TEST)) { | |
907 | ret->mismatch.hivers = i; | |
908 | break; | |
909 | } | |
910 | } | |
911 | return rpc_prog_mismatch; | |
912 | } | |
913 | ||
1da177e4 LT |
914 | /* |
915 | * This is the NFS server kernel thread | |
916 | */ | |
9867d76c JL |
917 | static int |
918 | nfsd(void *vrqstp) | |
1da177e4 | 919 | { |
9867d76c | 920 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
88c47666 SK |
921 | struct svc_xprt *perm_sock = list_entry(rqstp->rq_server->sv_permsocks.next, typeof(struct svc_xprt), xpt_list); |
922 | struct net *net = perm_sock->xpt_net; | |
5b8db00b | 923 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
5b444cc9 | 924 | int err; |
1da177e4 LT |
925 | |
926 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 927 | mutex_lock(&nfsd_mutex); |
1da177e4 | 928 | |
9867d76c | 929 | /* At this point, the thread shares current->fs |
47057abd AG |
930 | * with the init process. We need to create files with the |
931 | * umask as defined by the client instead of init's umask. */ | |
3e93cd67 | 932 | if (unshare_fs_struct() < 0) { |
1da177e4 LT |
933 | printk("Unable to start nfsd thread: out of memory\n"); |
934 | goto out; | |
935 | } | |
3e93cd67 | 936 | |
1da177e4 LT |
937 | current->fs->umask = 0; |
938 | ||
9867d76c JL |
939 | /* |
940 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
100766f8 | 941 | * the ones that will bring down the thread |
9867d76c | 942 | */ |
100766f8 JL |
943 | allow_signal(SIGKILL); |
944 | allow_signal(SIGHUP); | |
945 | allow_signal(SIGINT); | |
946 | allow_signal(SIGQUIT); | |
bedbdd8b | 947 | |
1da177e4 | 948 | nfsdstats.th_cnt++; |
bedbdd8b NB |
949 | mutex_unlock(&nfsd_mutex); |
950 | ||
83144186 | 951 | set_freezable(); |
1da177e4 LT |
952 | |
953 | /* | |
954 | * The main request loop | |
955 | */ | |
956 | for (;;) { | |
5b8db00b JL |
957 | /* Update sv_maxconn if it has changed */ |
958 | rqstp->rq_server->sv_maxconn = nn->max_connections; | |
959 | ||
1da177e4 LT |
960 | /* |
961 | * Find a socket with data available and call its | |
962 | * recvfrom routine. | |
963 | */ | |
6fb2b47f | 964 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 965 | ; |
9867d76c | 966 | if (err == -EINTR) |
1da177e4 | 967 | break; |
e0e81739 | 968 | validate_process_creds(); |
6fb2b47f | 969 | svc_process(rqstp); |
e0e81739 | 970 | validate_process_creds(); |
1da177e4 LT |
971 | } |
972 | ||
24e36663 | 973 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 974 | flush_signals(current); |
1da177e4 | 975 | |
bedbdd8b | 976 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
977 | nfsdstats.th_cnt --; |
978 | ||
979 | out: | |
57c8b13e | 980 | rqstp->rq_server = NULL; |
786185b5 | 981 | |
1da177e4 LT |
982 | /* Release the thread */ |
983 | svc_exit_thread(rqstp); | |
984 | ||
88c47666 | 985 | nfsd_destroy(net); |
57c8b13e | 986 | |
1da177e4 | 987 | /* Release module */ |
bedbdd8b | 988 | mutex_unlock(&nfsd_mutex); |
1da177e4 | 989 | module_put_and_exit(0); |
9867d76c | 990 | return 0; |
1da177e4 LT |
991 | } |
992 | ||
383c440d CL |
993 | /** |
994 | * nfsd_dispatch - Process an NFS or NFSACL Request | |
995 | * @rqstp: incoming request | |
996 | * @statp: pointer to location of accept_stat field in RPC Reply buffer | |
997 | * | |
998 | * This RPC dispatcher integrates the NFS server's duplicate reply cache. | |
999 | * | |
1000 | * Return values: | |
1001 | * %0: Processing complete; do not send a Reply | |
1002 | * %1: Processing complete; send Reply in rqstp->rq_res | |
1003 | */ | |
1004 | int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) | |
1da177e4 | 1005 | { |
4c96cb56 CL |
1006 | const struct svc_procedure *proc = rqstp->rq_procinfo; |
1007 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
1008 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
cc028a10 | 1009 | __be32 *p; |
1da177e4 | 1010 | |
1091006c BF |
1011 | /* |
1012 | * Give the xdr decoder a chance to change this if it wants | |
1013 | * (necessary in the NFSv4.0 compound case) | |
1014 | */ | |
1015 | rqstp->rq_cachetype = proc->pc_cachetype; | |
5191955d CL |
1016 | |
1017 | svcxdr_init_decode(rqstp); | |
85085aac CL |
1018 | if (!proc->pc_decode(rqstp, argv->iov_base)) |
1019 | goto out_decode_err; | |
1091006c | 1020 | |
1091006c | 1021 | switch (nfsd_cache_lookup(rqstp)) { |
84c138e7 CL |
1022 | case RC_DOIT: |
1023 | break; | |
1da177e4 | 1024 | case RC_REPLY: |
85085aac | 1025 | goto out_cached_reply; |
84c138e7 | 1026 | case RC_DROPIT: |
85085aac | 1027 | goto out_dropit; |
1da177e4 LT |
1028 | } |
1029 | ||
383c440d CL |
1030 | /* |
1031 | * Need to grab the location to store the status, as | |
1032 | * NFSv4 does some encoding while processing | |
1da177e4 | 1033 | */ |
cc028a10 | 1034 | p = resv->iov_base + resv->iov_len; |
bddfdbcd | 1035 | svcxdr_init_encode(rqstp); |
1da177e4 | 1036 | |
cc028a10 CL |
1037 | *statp = proc->pc_func(rqstp); |
1038 | if (*statp == rpc_drop_reply || test_bit(RQ_DROPME, &rqstp->rq_flags)) | |
85085aac | 1039 | goto out_update_drop; |
1da177e4 | 1040 | |
cc028a10 | 1041 | if (!proc->pc_encode(rqstp, p)) |
f0af2210 | 1042 | goto out_encode_err; |
1da177e4 | 1043 | |
57d276d7 | 1044 | nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1); |
85085aac CL |
1045 | out_cached_reply: |
1046 | return 1; | |
1047 | ||
85085aac | 1048 | out_decode_err: |
0dfdad1c | 1049 | trace_nfsd_garbage_args_err(rqstp); |
85085aac CL |
1050 | *statp = rpc_garbage_args; |
1051 | return 1; | |
1052 | ||
1053 | out_update_drop: | |
85085aac CL |
1054 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
1055 | out_dropit: | |
1056 | return 0; | |
1057 | ||
1058 | out_encode_err: | |
0dfdad1c | 1059 | trace_nfsd_cant_encode_err(rqstp); |
85085aac CL |
1060 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
1061 | *statp = rpc_system_err; | |
1da177e4 LT |
1062 | return 1; |
1063 | } | |
03cf6c9f | 1064 | |
788f7183 CL |
1065 | /** |
1066 | * nfssvc_decode_voidarg - Decode void arguments | |
1067 | * @rqstp: Server RPC transaction context | |
1068 | * @p: buffer containing arguments to decode | |
1069 | * | |
1070 | * Return values: | |
1071 | * %0: Arguments were not valid | |
1072 | * %1: Decoding was successful | |
1073 | */ | |
1074 | int nfssvc_decode_voidarg(struct svc_rqst *rqstp, __be32 *p) | |
1075 | { | |
1076 | return 1; | |
1077 | } | |
1078 | ||
1079 | /** | |
1080 | * nfssvc_encode_voidres - Encode void results | |
1081 | * @rqstp: Server RPC transaction context | |
1082 | * @p: buffer in which to encode results | |
1083 | * | |
1084 | * Return values: | |
1085 | * %0: Local error while encoding | |
1086 | * %1: Encoding was successful | |
1087 | */ | |
1088 | int nfssvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p) | |
1089 | { | |
bddfdbcd | 1090 | return 1; |
788f7183 CL |
1091 | } |
1092 | ||
03cf6c9f GB |
1093 | int nfsd_pool_stats_open(struct inode *inode, struct file *file) |
1094 | { | |
ed2d8aed | 1095 | int ret; |
11f77942 | 1096 | struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id); |
9dd9845f | 1097 | |
ed2d8aed | 1098 | mutex_lock(&nfsd_mutex); |
9dd9845f | 1099 | if (nn->nfsd_serv == NULL) { |
ed2d8aed | 1100 | mutex_unlock(&nfsd_mutex); |
03cf6c9f | 1101 | return -ENODEV; |
ed2d8aed RY |
1102 | } |
1103 | /* bump up the psudo refcount while traversing */ | |
9dd9845f SK |
1104 | svc_get(nn->nfsd_serv); |
1105 | ret = svc_pool_stats_open(nn->nfsd_serv, file); | |
ed2d8aed RY |
1106 | mutex_unlock(&nfsd_mutex); |
1107 | return ret; | |
1108 | } | |
1109 | ||
1110 | int nfsd_pool_stats_release(struct inode *inode, struct file *file) | |
1111 | { | |
1112 | int ret = seq_release(inode, file); | |
11f77942 | 1113 | struct net *net = inode->i_sb->s_fs_info; |
786185b5 | 1114 | |
ed2d8aed RY |
1115 | mutex_lock(&nfsd_mutex); |
1116 | /* this function really, really should have been called svc_put() */ | |
19f7e2ca | 1117 | nfsd_destroy(net); |
ed2d8aed RY |
1118 | mutex_unlock(&nfsd_mutex); |
1119 | return ret; | |
03cf6c9f | 1120 | } |