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> |
91d2e9b5 | 15 | #include <linux/siphash.h> |
1da177e4 | 16 | |
1da177e4 | 17 | #include <linux/sunrpc/stats.h> |
1da177e4 | 18 | #include <linux/sunrpc/svcsock.h> |
36684996 | 19 | #include <linux/sunrpc/svc_xprt.h> |
1da177e4 | 20 | #include <linux/lockd/bind.h> |
a257cdd0 | 21 | #include <linux/nfsacl.h> |
ed2d8aed | 22 | #include <linux/seq_file.h> |
36684996 SM |
23 | #include <linux/inetdevice.h> |
24 | #include <net/addrconf.h> | |
25 | #include <net/ipv6.h> | |
fc5d00b0 | 26 | #include <net/net_namespace.h> |
9a74af21 BH |
27 | #include "nfsd.h" |
28 | #include "cache.h" | |
0a3adade | 29 | #include "vfs.h" |
2c2fe290 | 30 | #include "netns.h" |
65294c1f | 31 | #include "filecache.h" |
1da177e4 | 32 | |
0dfdad1c CL |
33 | #include "trace.h" |
34 | ||
1da177e4 LT |
35 | #define NFSDDBG_FACILITY NFSDDBG_SVC |
36 | ||
1da177e4 | 37 | extern struct svc_program nfsd_program; |
9867d76c | 38 | static int nfsd(void *vrqstp); |
029be5d0 TM |
39 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
40 | static int nfsd_acl_rpcbind_set(struct net *, | |
41 | const struct svc_program *, | |
42 | u32, int, | |
43 | unsigned short, | |
44 | unsigned short); | |
e333f3bb TM |
45 | static __be32 nfsd_acl_init_request(struct svc_rqst *, |
46 | const struct svc_program *, | |
47 | struct svc_process_info *); | |
029be5d0 TM |
48 | #endif |
49 | static int nfsd_rpcbind_set(struct net *, | |
50 | const struct svc_program *, | |
51 | u32, int, | |
52 | unsigned short, | |
53 | unsigned short); | |
e333f3bb TM |
54 | static __be32 nfsd_init_request(struct svc_rqst *, |
55 | const struct svc_program *, | |
56 | struct svc_process_info *); | |
1da177e4 | 57 | |
bedbdd8b | 58 | /* |
2a36395f N |
59 | * nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and some members |
60 | * of the svc_serv struct such as ->sv_temp_socks and ->sv_permsocks. | |
bedbdd8b | 61 | * |
9dd9845f | 62 | * If (out side the lock) nn->nfsd_serv is non-NULL, then it must point to a |
ec52361d N |
63 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0 (unless |
64 | * nn->keep_active is set). That number of nfsd threads must | |
65 | * exist and each must be listed in ->sp_all_threads in some entry of | |
66 | * ->sv_pools[]. | |
bedbdd8b | 67 | * |
ec52361d N |
68 | * Each active thread holds a counted reference on nn->nfsd_serv, as does |
69 | * the nn->keep_active flag and various transient calls to svc_get(). | |
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[] = { |
2f3a4b2a | 94 | # if defined(CONFIG_NFSD_V2_ACL) |
3fb803a9 | 95 | [2] = &nfsd_acl_version2, |
2f3a4b2a JL |
96 | # endif |
97 | # if defined(CONFIG_NFSD_V3_ACL) | |
3fb803a9 | 98 | [3] = &nfsd_acl_version3, |
2f3a4b2a | 99 | # endif |
3fb803a9 AG |
100 | }; |
101 | ||
102 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 103 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
104 | |
105 | static struct svc_program nfsd_acl_program = { | |
106 | .pg_prog = NFS_ACL_PROGRAM, | |
107 | .pg_nvers = NFSD_ACL_NRVERS, | |
7c149057 | 108 | .pg_vers = nfsd_acl_version, |
1a8eff6d | 109 | .pg_name = "nfsacl", |
3fb803a9 AG |
110 | .pg_class = "nfsd", |
111 | .pg_stats = &nfsd_acl_svcstats, | |
112 | .pg_authenticate = &svc_set_client, | |
e333f3bb | 113 | .pg_init_request = nfsd_acl_init_request, |
029be5d0 | 114 | .pg_rpcbind_set = nfsd_acl_rpcbind_set, |
3fb803a9 AG |
115 | }; |
116 | ||
117 | static struct svc_stat nfsd_acl_svcstats = { | |
118 | .program = &nfsd_acl_program, | |
119 | }; | |
120 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
121 | ||
e9679189 | 122 | static const struct svc_version *nfsd_version[] = { |
2f3a4b2a | 123 | #if defined(CONFIG_NFSD_V2) |
70c3b76c | 124 | [2] = &nfsd_version2, |
2f3a4b2a | 125 | #endif |
70c3b76c | 126 | [3] = &nfsd_version3, |
70c3b76c N |
127 | #if defined(CONFIG_NFSD_V4) |
128 | [4] = &nfsd_version4, | |
129 | #endif | |
130 | }; | |
131 | ||
132 | #define NFSD_MINVERS 2 | |
e8c96f8c | 133 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
134 | |
135 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
136 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
137 | .pg_next = &nfsd_acl_program, | |
138 | #endif | |
70c3b76c N |
139 | .pg_prog = NFS_PROGRAM, /* program number */ |
140 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
e333f3bb | 141 | .pg_vers = nfsd_version, /* version table */ |
70c3b76c N |
142 | .pg_name = "nfsd", /* program name */ |
143 | .pg_class = "nfsd", /* authentication class */ | |
144 | .pg_stats = &nfsd_svcstats, /* version table */ | |
145 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
e333f3bb | 146 | .pg_init_request = nfsd_init_request, |
029be5d0 | 147 | .pg_rpcbind_set = nfsd_rpcbind_set, |
70c3b76c N |
148 | }; |
149 | ||
e333f3bb TM |
150 | static bool |
151 | nfsd_support_version(int vers) | |
152 | { | |
153 | if (vers >= NFSD_MINVERS && vers < NFSD_NRVERS) | |
154 | return nfsd_version[vers] != NULL; | |
155 | return false; | |
156 | } | |
157 | ||
158 | static bool * | |
159 | nfsd_alloc_versions(void) | |
160 | { | |
161 | bool *vers = kmalloc_array(NFSD_NRVERS, sizeof(bool), GFP_KERNEL); | |
162 | unsigned i; | |
163 | ||
164 | if (vers) { | |
165 | /* All compiled versions are enabled by default */ | |
166 | for (i = 0; i < NFSD_NRVERS; i++) | |
167 | vers[i] = nfsd_support_version(i); | |
168 | } | |
169 | return vers; | |
170 | } | |
171 | ||
172 | static bool * | |
173 | nfsd_alloc_minorversions(void) | |
174 | { | |
175 | bool *vers = kmalloc_array(NFSD_SUPPORTED_MINOR_VERSION + 1, | |
176 | sizeof(bool), GFP_KERNEL); | |
177 | unsigned i; | |
8daf220a | 178 | |
e333f3bb TM |
179 | if (vers) { |
180 | /* All minor versions are enabled by default */ | |
181 | for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++) | |
182 | vers[i] = nfsd_support_version(4); | |
183 | } | |
184 | return vers; | |
185 | } | |
186 | ||
187 | void | |
188 | nfsd_netns_free_versions(struct nfsd_net *nn) | |
189 | { | |
190 | kfree(nn->nfsd_versions); | |
191 | kfree(nn->nfsd4_minorversions); | |
192 | nn->nfsd_versions = NULL; | |
193 | nn->nfsd4_minorversions = NULL; | |
194 | } | |
195 | ||
196 | static void | |
197 | nfsd_netns_init_versions(struct nfsd_net *nn) | |
198 | { | |
199 | if (!nn->nfsd_versions) { | |
200 | nn->nfsd_versions = nfsd_alloc_versions(); | |
201 | nn->nfsd4_minorversions = nfsd_alloc_minorversions(); | |
202 | if (!nn->nfsd_versions || !nn->nfsd4_minorversions) | |
203 | nfsd_netns_free_versions(nn); | |
204 | } | |
205 | } | |
206 | ||
207 | int nfsd_vers(struct nfsd_net *nn, int vers, enum vers_op change) | |
6658d3a7 N |
208 | { |
209 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
15ddb4ae | 210 | return 0; |
6658d3a7 N |
211 | switch(change) { |
212 | case NFSD_SET: | |
e333f3bb TM |
213 | if (nn->nfsd_versions) |
214 | nn->nfsd_versions[vers] = nfsd_support_version(vers); | |
1a8eff6d | 215 | break; |
6658d3a7 | 216 | case NFSD_CLEAR: |
e333f3bb TM |
217 | nfsd_netns_init_versions(nn); |
218 | if (nn->nfsd_versions) | |
219 | nn->nfsd_versions[vers] = false; | |
6658d3a7 N |
220 | break; |
221 | case NFSD_TEST: | |
e333f3bb TM |
222 | if (nn->nfsd_versions) |
223 | return nn->nfsd_versions[vers]; | |
df561f66 | 224 | fallthrough; |
6658d3a7 | 225 | case NFSD_AVAIL: |
e333f3bb | 226 | return nfsd_support_version(vers); |
6658d3a7 N |
227 | } |
228 | return 0; | |
229 | } | |
8daf220a | 230 | |
d3635ff0 | 231 | static void |
e333f3bb | 232 | nfsd_adjust_nfsd_versions4(struct nfsd_net *nn) |
d3635ff0 TM |
233 | { |
234 | unsigned i; | |
235 | ||
236 | for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++) { | |
e333f3bb | 237 | if (nn->nfsd4_minorversions[i]) |
d3635ff0 TM |
238 | return; |
239 | } | |
e333f3bb | 240 | nfsd_vers(nn, 4, NFSD_CLEAR); |
d3635ff0 TM |
241 | } |
242 | ||
e333f3bb | 243 | int nfsd_minorversion(struct nfsd_net *nn, u32 minorversion, enum vers_op change) |
8daf220a | 244 | { |
928c6fb3 N |
245 | if (minorversion > NFSD_SUPPORTED_MINOR_VERSION && |
246 | change != NFSD_AVAIL) | |
8daf220a | 247 | return -1; |
e333f3bb | 248 | |
8daf220a BH |
249 | switch(change) { |
250 | case NFSD_SET: | |
e333f3bb TM |
251 | if (nn->nfsd4_minorversions) { |
252 | nfsd_vers(nn, 4, NFSD_SET); | |
253 | nn->nfsd4_minorversions[minorversion] = | |
254 | nfsd_vers(nn, 4, NFSD_TEST); | |
255 | } | |
8daf220a BH |
256 | break; |
257 | case NFSD_CLEAR: | |
e333f3bb TM |
258 | nfsd_netns_init_versions(nn); |
259 | if (nn->nfsd4_minorversions) { | |
260 | nn->nfsd4_minorversions[minorversion] = false; | |
261 | nfsd_adjust_nfsd_versions4(nn); | |
262 | } | |
8daf220a BH |
263 | break; |
264 | case NFSD_TEST: | |
e333f3bb TM |
265 | if (nn->nfsd4_minorversions) |
266 | return nn->nfsd4_minorversions[minorversion]; | |
267 | return nfsd_vers(nn, 4, NFSD_TEST); | |
8daf220a | 268 | case NFSD_AVAIL: |
e333f3bb TM |
269 | return minorversion <= NFSD_SUPPORTED_MINOR_VERSION && |
270 | nfsd_vers(nn, 4, NFSD_AVAIL); | |
8daf220a BH |
271 | } |
272 | return 0; | |
273 | } | |
274 | ||
1da177e4 LT |
275 | /* |
276 | * Maximum number of nfsd processes | |
277 | */ | |
278 | #define NFSD_MAXSERVS 8192 | |
279 | ||
9dd9845f | 280 | int nfsd_nrthreads(struct net *net) |
1da177e4 | 281 | { |
c7d106c9 | 282 | int rv = 0; |
9dd9845f SK |
283 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
284 | ||
c7d106c9 | 285 | mutex_lock(&nfsd_mutex); |
9dd9845f SK |
286 | if (nn->nfsd_serv) |
287 | rv = nn->nfsd_serv->sv_nrthreads; | |
c7d106c9 NB |
288 | mutex_unlock(&nfsd_mutex); |
289 | return rv; | |
1da177e4 LT |
290 | } |
291 | ||
4df493a2 | 292 | static int nfsd_init_socks(struct net *net, const struct cred *cred) |
59db4a0c BF |
293 | { |
294 | int error; | |
9dd9845f SK |
295 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
296 | ||
297 | if (!list_empty(&nn->nfsd_serv->sv_permsocks)) | |
59db4a0c BF |
298 | return 0; |
299 | ||
352ad314 CL |
300 | error = svc_xprt_create(nn->nfsd_serv, "udp", net, PF_INET, NFS_PORT, |
301 | SVC_SOCK_DEFAULTS, cred); | |
59db4a0c BF |
302 | if (error < 0) |
303 | return error; | |
304 | ||
352ad314 CL |
305 | error = svc_xprt_create(nn->nfsd_serv, "tcp", net, PF_INET, NFS_PORT, |
306 | SVC_SOCK_DEFAULTS, cred); | |
59db4a0c BF |
307 | if (error < 0) |
308 | return error; | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
4539f149 | 313 | static int nfsd_users = 0; |
4ad9a344 | 314 | |
70c53075 | 315 | static int nfsd_startup_generic(void) |
bda9cac1 SK |
316 | { |
317 | int ret; | |
318 | ||
4539f149 | 319 | if (nfsd_users++) |
bda9cac1 SK |
320 | return 0; |
321 | ||
65294c1f JL |
322 | ret = nfsd_file_cache_init(); |
323 | if (ret) | |
324 | goto dec_users; | |
d9499a95 | 325 | |
bda9cac1 SK |
326 | ret = nfs4_state_start(); |
327 | if (ret) | |
501cb184 | 328 | goto out_file_cache; |
bda9cac1 SK |
329 | return 0; |
330 | ||
65294c1f JL |
331 | out_file_cache: |
332 | nfsd_file_cache_shutdown(); | |
d9499a95 KM |
333 | dec_users: |
334 | nfsd_users--; | |
bda9cac1 SK |
335 | return ret; |
336 | } | |
337 | ||
338 | static void nfsd_shutdown_generic(void) | |
339 | { | |
4539f149 SK |
340 | if (--nfsd_users) |
341 | return; | |
342 | ||
bda9cac1 | 343 | nfs4_state_shutdown(); |
65294c1f | 344 | nfsd_file_cache_shutdown(); |
bda9cac1 SK |
345 | } |
346 | ||
e333f3bb | 347 | static bool nfsd_needs_lockd(struct nfsd_net *nn) |
8ef66714 | 348 | { |
e333f3bb | 349 | return nfsd_vers(nn, 2, NFSD_TEST) || nfsd_vers(nn, 3, NFSD_TEST); |
8ef66714 KM |
350 | } |
351 | ||
91d2e9b5 | 352 | /** |
3988a578 | 353 | * nfsd_copy_write_verifier - Atomically copy a write verifier |
91d2e9b5 CL |
354 | * @verf: buffer in which to receive the verifier cookie |
355 | * @nn: NFS net namespace | |
356 | * | |
357 | * This function provides a wait-free mechanism for copying the | |
3988a578 | 358 | * namespace's write verifier without tearing it. |
91d2e9b5 | 359 | */ |
3988a578 | 360 | void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn) |
27c438f5 TM |
361 | { |
362 | int seq = 0; | |
363 | ||
364 | do { | |
91d2e9b5 | 365 | read_seqbegin_or_lock(&nn->writeverf_lock, &seq); |
90d21755 | 366 | memcpy(verf, nn->writeverf, sizeof(nn->writeverf)); |
91d2e9b5 CL |
367 | } while (need_seqretry(&nn->writeverf_lock, seq)); |
368 | done_seqretry(&nn->writeverf_lock, seq); | |
27c438f5 TM |
369 | } |
370 | ||
3988a578 | 371 | static void nfsd_reset_write_verifier_locked(struct nfsd_net *nn) |
27c438f5 | 372 | { |
91d2e9b5 CL |
373 | struct timespec64 now; |
374 | u64 verf; | |
375 | ||
376 | /* | |
377 | * Because the time value is hashed, y2038 time_t overflow | |
378 | * is irrelevant in this usage. | |
379 | */ | |
380 | ktime_get_raw_ts64(&now); | |
381 | verf = siphash_2u64(now.tv_sec, now.tv_nsec, &nn->siphash_key); | |
382 | memcpy(nn->writeverf, &verf, sizeof(nn->writeverf)); | |
27c438f5 TM |
383 | } |
384 | ||
91d2e9b5 | 385 | /** |
3988a578 | 386 | * nfsd_reset_write_verifier - Generate a new write verifier |
91d2e9b5 CL |
387 | * @nn: NFS net namespace |
388 | * | |
389 | * This function updates the ->writeverf field of @nn. This field | |
390 | * contains an opaque cookie that, according to Section 18.32.3 of | |
391 | * RFC 8881, "the client can use to determine whether a server has | |
392 | * changed instance state (e.g., server restart) between a call to | |
393 | * WRITE and a subsequent call to either WRITE or COMMIT. This | |
394 | * cookie MUST be unchanged during a single instance of the NFSv4.1 | |
395 | * server and MUST be unique between instances of the NFSv4.1 | |
396 | * server." | |
397 | */ | |
3988a578 | 398 | void nfsd_reset_write_verifier(struct nfsd_net *nn) |
27c438f5 | 399 | { |
91d2e9b5 | 400 | write_seqlock(&nn->writeverf_lock); |
3988a578 | 401 | nfsd_reset_write_verifier_locked(nn); |
91d2e9b5 | 402 | write_sequnlock(&nn->writeverf_lock); |
27c438f5 TM |
403 | } |
404 | ||
5e092be7 CL |
405 | /* |
406 | * Crank up a set of per-namespace resources for a new NFSD instance, | |
407 | * including lockd, a duplicate reply cache, an open file cache | |
408 | * instance, and a cache of NFSv4 state objects. | |
409 | */ | |
70c53075 | 410 | static int nfsd_startup_net(struct net *net, const struct cred *cred) |
6ff50b3d | 411 | { |
2c2fe290 | 412 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
6ff50b3d SK |
413 | int ret; |
414 | ||
2c2fe290 SK |
415 | if (nn->nfsd_net_up) |
416 | return 0; | |
417 | ||
70c53075 | 418 | ret = nfsd_startup_generic(); |
6ff50b3d SK |
419 | if (ret) |
420 | return ret; | |
4df493a2 | 421 | ret = nfsd_init_socks(net, cred); |
903d9bf0 SK |
422 | if (ret) |
423 | goto out_socks; | |
8ef66714 | 424 | |
e333f3bb | 425 | if (nfsd_needs_lockd(nn) && !nn->lockd_up) { |
40373b12 | 426 | ret = lockd_up(net, cred); |
8ef66714 KM |
427 | if (ret) |
428 | goto out_socks; | |
e44b4bf2 | 429 | nn->lockd_up = true; |
8ef66714 KM |
430 | } |
431 | ||
9542e6a6 | 432 | ret = nfsd_file_cache_start_net(net); |
6ff50b3d SK |
433 | if (ret) |
434 | goto out_lockd; | |
f5f9d4a3 JL |
435 | |
436 | ret = nfsd_reply_cache_init(nn); | |
9542e6a6 TM |
437 | if (ret) |
438 | goto out_filecache; | |
6ff50b3d | 439 | |
f5f9d4a3 JL |
440 | ret = nfs4_state_start_net(net); |
441 | if (ret) | |
442 | goto out_reply_cache; | |
443 | ||
f4e44b39 DN |
444 | #ifdef CONFIG_NFSD_V4_2_INTER_SSC |
445 | nfsd4_ssc_init_umount_work(nn); | |
446 | #endif | |
2c2fe290 | 447 | nn->nfsd_net_up = true; |
6ff50b3d SK |
448 | return 0; |
449 | ||
f5f9d4a3 JL |
450 | out_reply_cache: |
451 | nfsd_reply_cache_shutdown(nn); | |
9542e6a6 TM |
452 | out_filecache: |
453 | nfsd_file_cache_shutdown_net(net); | |
6ff50b3d | 454 | out_lockd: |
8ef66714 KM |
455 | if (nn->lockd_up) { |
456 | lockd_down(net); | |
e44b4bf2 | 457 | nn->lockd_up = false; |
8ef66714 | 458 | } |
903d9bf0 | 459 | out_socks: |
bda9cac1 | 460 | nfsd_shutdown_generic(); |
4ad9a344 JL |
461 | return ret; |
462 | } | |
463 | ||
6ff50b3d SK |
464 | static void nfsd_shutdown_net(struct net *net) |
465 | { | |
2c2fe290 SK |
466 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
467 | ||
6ff50b3d | 468 | nfs4_state_shutdown_net(net); |
f5f9d4a3 | 469 | nfsd_reply_cache_shutdown(nn); |
789e1e10 | 470 | nfsd_file_cache_shutdown_net(net); |
8ef66714 KM |
471 | if (nn->lockd_up) { |
472 | lockd_down(net); | |
e44b4bf2 | 473 | nn->lockd_up = false; |
8ef66714 | 474 | } |
2c2fe290 | 475 | nn->nfsd_net_up = false; |
903d9bf0 | 476 | nfsd_shutdown_generic(); |
6ff50b3d SK |
477 | } |
478 | ||
d057cfec | 479 | static DEFINE_SPINLOCK(nfsd_notifier_lock); |
36684996 SM |
480 | static int nfsd_inetaddr_event(struct notifier_block *this, unsigned long event, |
481 | void *ptr) | |
482 | { | |
483 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; | |
484 | struct net_device *dev = ifa->ifa_dev->dev; | |
485 | struct net *net = dev_net(dev); | |
486 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
487 | struct sockaddr_in sin; | |
488 | ||
d057cfec | 489 | if (event != NETDEV_DOWN || !nn->nfsd_serv) |
36684996 SM |
490 | goto out; |
491 | ||
d057cfec | 492 | spin_lock(&nfsd_notifier_lock); |
36684996 SM |
493 | if (nn->nfsd_serv) { |
494 | dprintk("nfsd_inetaddr_event: removed %pI4\n", &ifa->ifa_local); | |
495 | sin.sin_family = AF_INET; | |
496 | sin.sin_addr.s_addr = ifa->ifa_local; | |
497 | svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin); | |
498 | } | |
d057cfec | 499 | spin_unlock(&nfsd_notifier_lock); |
36684996 SM |
500 | |
501 | out: | |
502 | return NOTIFY_DONE; | |
503 | } | |
504 | ||
505 | static struct notifier_block nfsd_inetaddr_notifier = { | |
506 | .notifier_call = nfsd_inetaddr_event, | |
507 | }; | |
508 | ||
509 | #if IS_ENABLED(CONFIG_IPV6) | |
510 | static int nfsd_inet6addr_event(struct notifier_block *this, | |
511 | unsigned long event, void *ptr) | |
512 | { | |
513 | struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; | |
514 | struct net_device *dev = ifa->idev->dev; | |
515 | struct net *net = dev_net(dev); | |
516 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
517 | struct sockaddr_in6 sin6; | |
518 | ||
d057cfec | 519 | if (event != NETDEV_DOWN || !nn->nfsd_serv) |
36684996 SM |
520 | goto out; |
521 | ||
d057cfec | 522 | spin_lock(&nfsd_notifier_lock); |
36684996 SM |
523 | if (nn->nfsd_serv) { |
524 | dprintk("nfsd_inet6addr_event: removed %pI6\n", &ifa->addr); | |
525 | sin6.sin6_family = AF_INET6; | |
526 | sin6.sin6_addr = ifa->addr; | |
7b19824d SM |
527 | if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL) |
528 | sin6.sin6_scope_id = ifa->idev->dev->ifindex; | |
36684996 SM |
529 | svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin6); |
530 | } | |
d057cfec N |
531 | spin_unlock(&nfsd_notifier_lock); |
532 | ||
36684996 SM |
533 | out: |
534 | return NOTIFY_DONE; | |
535 | } | |
536 | ||
537 | static struct notifier_block nfsd_inet6addr_notifier = { | |
538 | .notifier_call = nfsd_inet6addr_event, | |
539 | }; | |
540 | #endif | |
541 | ||
1eca45f8 VA |
542 | /* Only used under nfsd_mutex, so this atomic may be overkill: */ |
543 | static atomic_t nfsd_notifier_refcount = ATOMIC_INIT(0); | |
544 | ||
9f28a971 | 545 | static void nfsd_last_thread(struct net *net) |
4ad9a344 | 546 | { |
903d9bf0 | 547 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
9f28a971 N |
548 | struct svc_serv *serv = nn->nfsd_serv; |
549 | ||
550 | spin_lock(&nfsd_notifier_lock); | |
551 | nn->nfsd_serv = NULL; | |
552 | spin_unlock(&nfsd_notifier_lock); | |
903d9bf0 | 553 | |
1eca45f8 VA |
554 | /* check if the notifier still has clients */ |
555 | if (atomic_dec_return(&nfsd_notifier_refcount) == 0) { | |
556 | unregister_inetaddr_notifier(&nfsd_inetaddr_notifier); | |
36684996 | 557 | #if IS_ENABLED(CONFIG_IPV6) |
1eca45f8 | 558 | unregister_inet6addr_notifier(&nfsd_inet6addr_notifier); |
36684996 | 559 | #endif |
1eca45f8 VA |
560 | } |
561 | ||
9f28a971 N |
562 | svc_xprt_destroy_all(serv, net); |
563 | ||
4ad9a344 JL |
564 | /* |
565 | * write_ports can create the server without actually starting | |
566 | * any threads--if we get shut down before any threads are | |
567 | * started, then nfsd_last_thread will be run before any of this | |
691412b4 | 568 | * other initialization has been done except the rpcb information. |
4ad9a344 | 569 | */ |
691412b4 | 570 | svc_rpcb_cleanup(serv, net); |
903d9bf0 | 571 | if (!nn->nfsd_net_up) |
4ad9a344 | 572 | return; |
16d05870 | 573 | |
691412b4 | 574 | nfsd_shutdown_net(net); |
b3853e0e | 575 | nfsd_export_flush(net); |
bc591ccf | 576 | } |
6658d3a7 | 577 | |
e333f3bb | 578 | void nfsd_reset_versions(struct nfsd_net *nn) |
6658d3a7 | 579 | { |
6658d3a7 N |
580 | int i; |
581 | ||
800a938f | 582 | for (i = 0; i < NFSD_NRVERS; i++) |
e333f3bb | 583 | if (nfsd_vers(nn, i, NFSD_TEST)) |
800a938f | 584 | return; |
6658d3a7 | 585 | |
800a938f N |
586 | for (i = 0; i < NFSD_NRVERS; i++) |
587 | if (i != 4) | |
e333f3bb | 588 | nfsd_vers(nn, i, NFSD_SET); |
800a938f N |
589 | else { |
590 | int minor = 0; | |
e333f3bb | 591 | while (nfsd_minorversion(nn, minor, NFSD_SET) >= 0) |
800a938f N |
592 | minor++; |
593 | } | |
6658d3a7 N |
594 | } |
595 | ||
c3d06f9c AA |
596 | /* |
597 | * Each session guarantees a negotiated per slot memory cache for replies | |
598 | * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated | |
599 | * NFSv4.1 server might want to use more memory for a DRC than a machine | |
600 | * with mutiple services. | |
601 | * | |
602 | * Impose a hard limit on the number of pages for the DRC which varies | |
603 | * according to the machines free pages. This is of course only a default. | |
604 | * | |
605 | * For now this is a #defined shift which could be under admin control | |
606 | * in the future. | |
607 | */ | |
608 | static void set_max_drc(void) | |
609 | { | |
44d8660d | 610 | #define NFSD_DRC_SIZE_SHIFT 7 |
0c193054 AA |
611 | nfsd_drc_max_mem = (nr_free_buffer_pages() |
612 | >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; | |
613 | nfsd_drc_mem_used = 0; | |
697ce9be | 614 | dprintk("%s nfsd_drc_max_mem %lu \n", __func__, nfsd_drc_max_mem); |
c3d06f9c | 615 | } |
bedbdd8b | 616 | |
87b0fc7d | 617 | static int nfsd_get_default_max_blksize(void) |
02a375f0 | 618 | { |
87b0fc7d BF |
619 | struct sysinfo i; |
620 | unsigned long long target; | |
621 | unsigned long ret; | |
bedbdd8b | 622 | |
87b0fc7d | 623 | si_meminfo(&i); |
508f9227 | 624 | target = (i.totalram - i.totalhigh) << PAGE_SHIFT; |
87b0fc7d BF |
625 | /* |
626 | * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig | |
627 | * machines, but only uses 32K on 128M machines. Bottom out at | |
628 | * 8K on 32M and smaller. Of course, this is only a default. | |
629 | */ | |
630 | target >>= 12; | |
631 | ||
632 | ret = NFSSVC_MAXBLKSIZE; | |
633 | while (ret > target && ret >= 8*1024*2) | |
634 | ret /= 2; | |
635 | return ret; | |
636 | } | |
637 | ||
c6c7f2a8 TM |
638 | void nfsd_shutdown_threads(struct net *net) |
639 | { | |
640 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
641 | struct svc_serv *serv; | |
642 | ||
643 | mutex_lock(&nfsd_mutex); | |
644 | serv = nn->nfsd_serv; | |
645 | if (serv == NULL) { | |
646 | mutex_unlock(&nfsd_mutex); | |
647 | return; | |
648 | } | |
649 | ||
650 | svc_get(serv); | |
651 | /* Kill outstanding nfsd threads */ | |
3ebdbe52 | 652 | svc_set_num_threads(serv, NULL, 0); |
9f28a971 N |
653 | nfsd_last_thread(net); |
654 | svc_put(serv); | |
c6c7f2a8 | 655 | mutex_unlock(&nfsd_mutex); |
c6c7f2a8 TM |
656 | } |
657 | ||
44fb26c6 | 658 | bool i_am_nfsd(void) |
28df3d15 BF |
659 | { |
660 | return kthread_func(current) == nfsd; | |
661 | } | |
662 | ||
6777436b | 663 | int nfsd_create_serv(struct net *net) |
87b0fc7d | 664 | { |
9793f7c8 | 665 | int error; |
b9c0ef85 | 666 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
d057cfec | 667 | struct svc_serv *serv; |
9793f7c8 | 668 | |
bedbdd8b | 669 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
9dd9845f SK |
670 | if (nn->nfsd_serv) { |
671 | svc_get(nn->nfsd_serv); | |
02a375f0 N |
672 | return 0; |
673 | } | |
87b0fc7d BF |
674 | if (nfsd_max_blksize == 0) |
675 | nfsd_max_blksize = nfsd_get_default_max_blksize(); | |
e333f3bb | 676 | nfsd_reset_versions(nn); |
37902c63 | 677 | serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, nfsd); |
d057cfec | 678 | if (serv == NULL) |
628b3687 | 679 | return -ENOMEM; |
bedbdd8b | 680 | |
d057cfec N |
681 | serv->sv_maxconn = nn->max_connections; |
682 | error = svc_bind(serv, net); | |
9793f7c8 | 683 | if (error < 0) { |
d057cfec | 684 | svc_put(serv); |
9793f7c8 SK |
685 | return error; |
686 | } | |
d057cfec N |
687 | spin_lock(&nfsd_notifier_lock); |
688 | nn->nfsd_serv = serv; | |
689 | spin_unlock(&nfsd_notifier_lock); | |
9793f7c8 | 690 | |
628b3687 | 691 | set_max_drc(); |
1eca45f8 VA |
692 | /* check if the notifier is already set */ |
693 | if (atomic_inc_return(&nfsd_notifier_refcount) == 1) { | |
694 | register_inetaddr_notifier(&nfsd_inetaddr_notifier); | |
36684996 | 695 | #if IS_ENABLED(CONFIG_IPV6) |
1eca45f8 | 696 | register_inet6addr_notifier(&nfsd_inet6addr_notifier); |
36684996 | 697 | #endif |
1eca45f8 | 698 | } |
3988a578 | 699 | nfsd_reset_write_verifier(nn); |
87b0fc7d | 700 | return 0; |
02a375f0 N |
701 | } |
702 | ||
9dd9845f | 703 | int nfsd_nrpools(struct net *net) |
eed2965a | 704 | { |
9dd9845f SK |
705 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
706 | ||
707 | if (nn->nfsd_serv == NULL) | |
eed2965a GB |
708 | return 0; |
709 | else | |
9dd9845f | 710 | return nn->nfsd_serv->sv_nrpools; |
eed2965a GB |
711 | } |
712 | ||
9dd9845f | 713 | int nfsd_get_nrthreads(int n, int *nthreads, struct net *net) |
eed2965a | 714 | { |
9dd9845f | 715 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
2e8fc923 N |
716 | struct svc_serv *serv = nn->nfsd_serv; |
717 | int i; | |
eed2965a | 718 | |
2e8fc923 N |
719 | if (serv) |
720 | for (i = 0; i < serv->sv_nrpools && i < n; i++) | |
721 | nthreads[i] = atomic_read(&serv->sv_pools[i].sp_nrthreads); | |
eed2965a GB |
722 | return 0; |
723 | } | |
724 | ||
3938a0d5 | 725 | int nfsd_set_nrthreads(int n, int *nthreads, struct net *net) |
eed2965a GB |
726 | { |
727 | int i = 0; | |
728 | int tot = 0; | |
729 | int err = 0; | |
9dd9845f | 730 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
eed2965a | 731 | |
bedbdd8b NB |
732 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
733 | ||
9dd9845f | 734 | if (nn->nfsd_serv == NULL || n <= 0) |
eed2965a GB |
735 | return 0; |
736 | ||
9dd9845f SK |
737 | if (n > nn->nfsd_serv->sv_nrpools) |
738 | n = nn->nfsd_serv->sv_nrpools; | |
eed2965a GB |
739 | |
740 | /* enforce a global maximum number of threads */ | |
741 | tot = 0; | |
742 | for (i = 0; i < n; i++) { | |
3c7aa15d | 743 | nthreads[i] = min(nthreads[i], NFSD_MAXSERVS); |
eed2965a GB |
744 | tot += nthreads[i]; |
745 | } | |
746 | if (tot > NFSD_MAXSERVS) { | |
747 | /* total too large: scale down requested numbers */ | |
748 | for (i = 0; i < n && tot > 0; i++) { | |
3409e4f1 | 749 | int new = nthreads[i] * NFSD_MAXSERVS / tot; |
eed2965a GB |
750 | tot -= (nthreads[i] - new); |
751 | nthreads[i] = new; | |
752 | } | |
753 | for (i = 0; i < n && tot > 0; i++) { | |
754 | nthreads[i]--; | |
755 | tot--; | |
756 | } | |
757 | } | |
758 | ||
759 | /* | |
760 | * There must always be a thread in pool 0; the admin | |
761 | * can't shut down NFS completely using pool_threads. | |
762 | */ | |
763 | if (nthreads[0] == 0) | |
764 | nthreads[0] = 1; | |
765 | ||
766 | /* apply the new numbers */ | |
9dd9845f | 767 | svc_get(nn->nfsd_serv); |
eed2965a | 768 | for (i = 0; i < n; i++) { |
3ebdbe52 N |
769 | err = svc_set_num_threads(nn->nfsd_serv, |
770 | &nn->nfsd_serv->sv_pools[i], | |
771 | nthreads[i]); | |
eed2965a GB |
772 | if (err) |
773 | break; | |
774 | } | |
9f28a971 | 775 | svc_put(nn->nfsd_serv); |
eed2965a GB |
776 | return err; |
777 | } | |
778 | ||
ac77efbe JL |
779 | /* |
780 | * Adjust the number of threads and return the new number of threads. | |
781 | * This is also the function that starts the server if necessary, if | |
782 | * this is the first time nrservs is nonzero. | |
783 | */ | |
1da177e4 | 784 | int |
4df493a2 | 785 | nfsd_svc(int nrservs, struct net *net, const struct cred *cred) |
1da177e4 LT |
786 | { |
787 | int error; | |
9dd9845f | 788 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
9f28a971 | 789 | struct svc_serv *serv; |
bedbdd8b NB |
790 | |
791 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 792 | dprintk("nfsd: creating service\n"); |
3c7aa15d KM |
793 | |
794 | nrservs = max(nrservs, 0); | |
795 | nrservs = min(nrservs, NFSD_MAXSERVS); | |
671e1fcf | 796 | error = 0; |
3c7aa15d | 797 | |
9dd9845f | 798 | if (nrservs == 0 && nn->nfsd_serv == NULL) |
671e1fcf N |
799 | goto out; |
800 | ||
72f78ae0 | 801 | strscpy(nn->nfsd_name, utsname()->nodename, |
7627d7dc SM |
802 | sizeof(nn->nfsd_name)); |
803 | ||
6777436b | 804 | error = nfsd_create_serv(net); |
02a375f0 | 805 | if (error) |
774f8bbd | 806 | goto out; |
9f28a971 | 807 | serv = nn->nfsd_serv; |
774f8bbd | 808 | |
70c53075 | 809 | error = nfsd_startup_net(net, cred); |
af4718f3 | 810 | if (error) |
8c62d127 | 811 | goto out_put; |
9f28a971 | 812 | error = svc_set_num_threads(serv, NULL, nrservs); |
774f8bbd | 813 | if (error) |
bf320752 | 814 | goto out_put; |
9f28a971 | 815 | error = serv->sv_nrthreads; |
8c62d127 | 816 | out_put: |
ec52361d N |
817 | /* Threads now hold service active */ |
818 | if (xchg(&nn->keep_active, 0)) | |
9f28a971 | 819 | svc_put(serv); |
bf320752 N |
820 | |
821 | if (serv->sv_nrthreads == 0) | |
822 | nfsd_last_thread(net); | |
9f28a971 | 823 | svc_put(serv); |
4ad9a344 | 824 | out: |
bedbdd8b | 825 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
826 | return error; |
827 | } | |
828 | ||
029be5d0 TM |
829 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
830 | static bool | |
831 | nfsd_support_acl_version(int vers) | |
832 | { | |
833 | if (vers >= NFSD_ACL_MINVERS && vers < NFSD_ACL_NRVERS) | |
834 | return nfsd_acl_version[vers] != NULL; | |
835 | return false; | |
836 | } | |
837 | ||
838 | static int | |
839 | nfsd_acl_rpcbind_set(struct net *net, const struct svc_program *progp, | |
840 | u32 version, int family, unsigned short proto, | |
841 | unsigned short port) | |
842 | { | |
843 | if (!nfsd_support_acl_version(version) || | |
e333f3bb | 844 | !nfsd_vers(net_generic(net, nfsd_net_id), version, NFSD_TEST)) |
029be5d0 TM |
845 | return 0; |
846 | return svc_generic_rpcbind_set(net, progp, version, family, | |
847 | proto, port); | |
848 | } | |
e333f3bb TM |
849 | |
850 | static __be32 | |
851 | nfsd_acl_init_request(struct svc_rqst *rqstp, | |
852 | const struct svc_program *progp, | |
853 | struct svc_process_info *ret) | |
854 | { | |
855 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
856 | int i; | |
857 | ||
858 | if (likely(nfsd_support_acl_version(rqstp->rq_vers) && | |
859 | nfsd_vers(nn, rqstp->rq_vers, NFSD_TEST))) | |
860 | return svc_generic_init_request(rqstp, progp, ret); | |
861 | ||
862 | ret->mismatch.lovers = NFSD_ACL_NRVERS; | |
863 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) { | |
864 | if (nfsd_support_acl_version(rqstp->rq_vers) && | |
865 | nfsd_vers(nn, i, NFSD_TEST)) { | |
866 | ret->mismatch.lovers = i; | |
867 | break; | |
868 | } | |
869 | } | |
870 | if (ret->mismatch.lovers == NFSD_ACL_NRVERS) | |
871 | return rpc_prog_unavail; | |
872 | ret->mismatch.hivers = NFSD_ACL_MINVERS; | |
873 | for (i = NFSD_ACL_NRVERS - 1; i >= NFSD_ACL_MINVERS; i--) { | |
874 | if (nfsd_support_acl_version(rqstp->rq_vers) && | |
875 | nfsd_vers(nn, i, NFSD_TEST)) { | |
876 | ret->mismatch.hivers = i; | |
877 | break; | |
878 | } | |
879 | } | |
880 | return rpc_prog_mismatch; | |
881 | } | |
029be5d0 TM |
882 | #endif |
883 | ||
884 | static int | |
885 | nfsd_rpcbind_set(struct net *net, const struct svc_program *progp, | |
886 | u32 version, int family, unsigned short proto, | |
887 | unsigned short port) | |
888 | { | |
e333f3bb | 889 | if (!nfsd_vers(net_generic(net, nfsd_net_id), version, NFSD_TEST)) |
029be5d0 TM |
890 | return 0; |
891 | return svc_generic_rpcbind_set(net, progp, version, family, | |
892 | proto, port); | |
893 | } | |
1da177e4 | 894 | |
e333f3bb TM |
895 | static __be32 |
896 | nfsd_init_request(struct svc_rqst *rqstp, | |
897 | const struct svc_program *progp, | |
898 | struct svc_process_info *ret) | |
899 | { | |
900 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); | |
901 | int i; | |
902 | ||
903 | if (likely(nfsd_vers(nn, rqstp->rq_vers, NFSD_TEST))) | |
904 | return svc_generic_init_request(rqstp, progp, ret); | |
905 | ||
906 | ret->mismatch.lovers = NFSD_NRVERS; | |
907 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
908 | if (nfsd_vers(nn, i, NFSD_TEST)) { | |
909 | ret->mismatch.lovers = i; | |
910 | break; | |
911 | } | |
912 | } | |
913 | if (ret->mismatch.lovers == NFSD_NRVERS) | |
914 | return rpc_prog_unavail; | |
915 | ret->mismatch.hivers = NFSD_MINVERS; | |
916 | for (i = NFSD_NRVERS - 1; i >= NFSD_MINVERS; i--) { | |
917 | if (nfsd_vers(nn, i, NFSD_TEST)) { | |
918 | ret->mismatch.hivers = i; | |
919 | break; | |
920 | } | |
921 | } | |
922 | return rpc_prog_mismatch; | |
923 | } | |
924 | ||
1da177e4 LT |
925 | /* |
926 | * This is the NFS server kernel thread | |
927 | */ | |
9867d76c JL |
928 | static int |
929 | nfsd(void *vrqstp) | |
1da177e4 | 930 | { |
9867d76c | 931 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
88c47666 SK |
932 | struct svc_xprt *perm_sock = list_entry(rqstp->rq_server->sv_permsocks.next, typeof(struct svc_xprt), xpt_list); |
933 | struct net *net = perm_sock->xpt_net; | |
5b8db00b | 934 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1da177e4 | 935 | |
9867d76c | 936 | /* At this point, the thread shares current->fs |
47057abd AG |
937 | * with the init process. We need to create files with the |
938 | * umask as defined by the client instead of init's umask. */ | |
3e93cd67 | 939 | if (unshare_fs_struct() < 0) { |
1da177e4 LT |
940 | printk("Unable to start nfsd thread: out of memory\n"); |
941 | goto out; | |
942 | } | |
3e93cd67 | 943 | |
1da177e4 LT |
944 | current->fs->umask = 0; |
945 | ||
9b6c8c9b | 946 | atomic_inc(&nfsdstats.th_cnt); |
bedbdd8b | 947 | |
83144186 | 948 | set_freezable(); |
1da177e4 LT |
949 | |
950 | /* | |
951 | * The main request loop | |
952 | */ | |
fa341560 | 953 | while (!svc_thread_should_stop(rqstp)) { |
5b8db00b JL |
954 | /* Update sv_maxconn if it has changed */ |
955 | rqstp->rq_server->sv_maxconn = nn->max_connections; | |
956 | ||
c743b425 | 957 | svc_recv(rqstp); |
e0e81739 | 958 | validate_process_creds(); |
1da177e4 LT |
959 | } |
960 | ||
9b6c8c9b | 961 | atomic_dec(&nfsdstats.th_cnt); |
1da177e4 LT |
962 | |
963 | out: | |
964 | /* Release the thread */ | |
965 | svc_exit_thread(rqstp); | |
9867d76c | 966 | return 0; |
1da177e4 LT |
967 | } |
968 | ||
383c440d CL |
969 | /** |
970 | * nfsd_dispatch - Process an NFS or NFSACL Request | |
971 | * @rqstp: incoming request | |
383c440d CL |
972 | * |
973 | * This RPC dispatcher integrates the NFS server's duplicate reply cache. | |
974 | * | |
975 | * Return values: | |
976 | * %0: Processing complete; do not send a Reply | |
977 | * %1: Processing complete; send Reply in rqstp->rq_res | |
978 | */ | |
cee4db19 | 979 | int nfsd_dispatch(struct svc_rqst *rqstp) |
1da177e4 | 980 | { |
4c96cb56 | 981 | const struct svc_procedure *proc = rqstp->rq_procinfo; |
cee4db19 | 982 | __be32 *statp = rqstp->rq_accept_statp; |
e7421ce7 | 983 | struct nfsd_cacherep *rp; |
1da177e4 | 984 | |
1091006c BF |
985 | /* |
986 | * Give the xdr decoder a chance to change this if it wants | |
987 | * (necessary in the NFSv4.0 compound case) | |
988 | */ | |
989 | rqstp->rq_cachetype = proc->pc_cachetype; | |
5191955d | 990 | |
16c66364 | 991 | if (!proc->pc_decode(rqstp, &rqstp->rq_arg_stream)) |
85085aac | 992 | goto out_decode_err; |
1091006c | 993 | |
bd9d6a3e LB |
994 | /* |
995 | * Release rq_status_counter setting it to an odd value after the rpc | |
996 | * request has been properly parsed. rq_status_counter is used to | |
997 | * notify the consumers if the rqstp fields are stable | |
998 | * (rq_status_counter is odd) or not meaningful (rq_status_counter | |
999 | * is even). | |
1000 | */ | |
1001 | smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter | 1); | |
1002 | ||
cb18eca4 CL |
1003 | rp = NULL; |
1004 | switch (nfsd_cache_lookup(rqstp, &rp)) { | |
84c138e7 CL |
1005 | case RC_DOIT: |
1006 | break; | |
1da177e4 | 1007 | case RC_REPLY: |
85085aac | 1008 | goto out_cached_reply; |
84c138e7 | 1009 | case RC_DROPIT: |
85085aac | 1010 | goto out_dropit; |
1da177e4 LT |
1011 | } |
1012 | ||
cc028a10 | 1013 | *statp = proc->pc_func(rqstp); |
93155647 | 1014 | if (test_bit(RQ_DROPME, &rqstp->rq_flags)) |
85085aac | 1015 | goto out_update_drop; |
1da177e4 | 1016 | |
fda49441 | 1017 | if (!proc->pc_encode(rqstp, &rqstp->rq_res_stream)) |
f0af2210 | 1018 | goto out_encode_err; |
1da177e4 | 1019 | |
bd9d6a3e LB |
1020 | /* |
1021 | * Release rq_status_counter setting it to an even value after the rpc | |
1022 | * request has been properly processed. | |
1023 | */ | |
1024 | smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter + 1); | |
1025 | ||
cb18eca4 | 1026 | nfsd_cache_update(rqstp, rp, rqstp->rq_cachetype, statp + 1); |
85085aac CL |
1027 | out_cached_reply: |
1028 | return 1; | |
1029 | ||
85085aac | 1030 | out_decode_err: |
0dfdad1c | 1031 | trace_nfsd_garbage_args_err(rqstp); |
85085aac CL |
1032 | *statp = rpc_garbage_args; |
1033 | return 1; | |
1034 | ||
1035 | out_update_drop: | |
cb18eca4 | 1036 | nfsd_cache_update(rqstp, rp, RC_NOCACHE, NULL); |
85085aac CL |
1037 | out_dropit: |
1038 | return 0; | |
1039 | ||
1040 | out_encode_err: | |
0dfdad1c | 1041 | trace_nfsd_cant_encode_err(rqstp); |
cb18eca4 | 1042 | nfsd_cache_update(rqstp, rp, RC_NOCACHE, NULL); |
85085aac | 1043 | *statp = rpc_system_err; |
1da177e4 LT |
1044 | return 1; |
1045 | } | |
03cf6c9f | 1046 | |
788f7183 CL |
1047 | /** |
1048 | * nfssvc_decode_voidarg - Decode void arguments | |
1049 | * @rqstp: Server RPC transaction context | |
16c66364 | 1050 | * @xdr: XDR stream positioned at arguments to decode |
788f7183 CL |
1051 | * |
1052 | * Return values: | |
c44b31c2 CL |
1053 | * %false: Arguments were not valid |
1054 | * %true: Decoding was successful | |
788f7183 | 1055 | */ |
c44b31c2 | 1056 | bool nfssvc_decode_voidarg(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
788f7183 | 1057 | { |
291cd656 | 1058 | return true; |
788f7183 CL |
1059 | } |
1060 | ||
1061 | /** | |
1062 | * nfssvc_encode_voidres - Encode void results | |
1063 | * @rqstp: Server RPC transaction context | |
fda49441 | 1064 | * @xdr: XDR stream into which to encode results |
788f7183 CL |
1065 | * |
1066 | * Return values: | |
130e2054 CL |
1067 | * %false: Local error while encoding |
1068 | * %true: Encoding was successful | |
788f7183 | 1069 | */ |
130e2054 | 1070 | bool nfssvc_encode_voidres(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
788f7183 | 1071 | { |
130e2054 | 1072 | return true; |
788f7183 CL |
1073 | } |
1074 | ||
03cf6c9f GB |
1075 | int nfsd_pool_stats_open(struct inode *inode, struct file *file) |
1076 | { | |
ed2d8aed | 1077 | int ret; |
11f77942 | 1078 | struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id); |
9dd9845f | 1079 | |
ed2d8aed | 1080 | mutex_lock(&nfsd_mutex); |
9dd9845f | 1081 | if (nn->nfsd_serv == NULL) { |
ed2d8aed | 1082 | mutex_unlock(&nfsd_mutex); |
03cf6c9f | 1083 | return -ENODEV; |
ed2d8aed | 1084 | } |
9dd9845f SK |
1085 | svc_get(nn->nfsd_serv); |
1086 | ret = svc_pool_stats_open(nn->nfsd_serv, file); | |
ed2d8aed RY |
1087 | mutex_unlock(&nfsd_mutex); |
1088 | return ret; | |
1089 | } | |
1090 | ||
1091 | int nfsd_pool_stats_release(struct inode *inode, struct file *file) | |
1092 | { | |
88956eab N |
1093 | struct seq_file *seq = file->private_data; |
1094 | struct svc_serv *serv = seq->private; | |
ed2d8aed | 1095 | int ret = seq_release(inode, file); |
786185b5 | 1096 | |
ed2d8aed | 1097 | mutex_lock(&nfsd_mutex); |
88956eab | 1098 | svc_put(serv); |
ed2d8aed RY |
1099 | mutex_unlock(&nfsd_mutex); |
1100 | return ret; | |
03cf6c9f | 1101 | } |