Commit | Line | Data |
---|---|---|
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> |
1da177e4 | 17 | #include <linux/lockd/bind.h> |
a257cdd0 | 18 | #include <linux/nfsacl.h> |
ed2d8aed | 19 | #include <linux/seq_file.h> |
fc5d00b0 | 20 | #include <net/net_namespace.h> |
9a74af21 BH |
21 | #include "nfsd.h" |
22 | #include "cache.h" | |
0a3adade | 23 | #include "vfs.h" |
2c2fe290 | 24 | #include "netns.h" |
1da177e4 LT |
25 | |
26 | #define NFSDDBG_FACILITY NFSDDBG_SVC | |
27 | ||
1da177e4 | 28 | extern struct svc_program nfsd_program; |
9867d76c | 29 | static int nfsd(void *vrqstp); |
1da177e4 | 30 | |
bedbdd8b | 31 | /* |
9dd9845f | 32 | * nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and the members |
bedbdd8b NB |
33 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some |
34 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt | |
35 | * | |
9dd9845f | 36 | * If (out side the lock) nn->nfsd_serv is non-NULL, then it must point to a |
bedbdd8b NB |
37 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number |
38 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each | |
39 | * entry of ->sv_pools[]. | |
40 | * | |
41 | * Transitions of the thread count between zero and non-zero are of particular | |
42 | * interest since the svc_serv needs to be created and initialized at that | |
43 | * point, or freed. | |
3dd98a3b JL |
44 | * |
45 | * Finally, the nfsd_mutex also protects some of the global variables that are | |
46 | * accessed when nfsd starts and that are settable via the write_* routines in | |
47 | * nfsctl.c. In particular: | |
48 | * | |
49 | * user_recovery_dirname | |
50 | * user_lease_time | |
51 | * nfsd_versions | |
bedbdd8b NB |
52 | */ |
53 | DEFINE_MUTEX(nfsd_mutex); | |
bedbdd8b | 54 | |
4bd9b0f4 AA |
55 | /* |
56 | * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used. | |
57 | * nfsd_drc_max_pages limits the total amount of memory available for | |
58 | * version 4.1 DRC caches. | |
59 | * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage. | |
60 | */ | |
61 | spinlock_t nfsd_drc_lock; | |
697ce9be ZY |
62 | unsigned long nfsd_drc_max_mem; |
63 | unsigned long nfsd_drc_mem_used; | |
4bd9b0f4 | 64 | |
3fb803a9 AG |
65 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
66 | static struct svc_stat nfsd_acl_svcstats; | |
67 | static struct svc_version * nfsd_acl_version[] = { | |
68 | [2] = &nfsd_acl_version2, | |
69 | [3] = &nfsd_acl_version3, | |
70 | }; | |
71 | ||
72 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 73 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
74 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
75 | ||
76 | static struct svc_program nfsd_acl_program = { | |
77 | .pg_prog = NFS_ACL_PROGRAM, | |
78 | .pg_nvers = NFSD_ACL_NRVERS, | |
79 | .pg_vers = nfsd_acl_versions, | |
1a8eff6d | 80 | .pg_name = "nfsacl", |
3fb803a9 AG |
81 | .pg_class = "nfsd", |
82 | .pg_stats = &nfsd_acl_svcstats, | |
83 | .pg_authenticate = &svc_set_client, | |
84 | }; | |
85 | ||
86 | static struct svc_stat nfsd_acl_svcstats = { | |
87 | .program = &nfsd_acl_program, | |
88 | }; | |
89 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
90 | ||
70c3b76c N |
91 | static struct svc_version * nfsd_version[] = { |
92 | [2] = &nfsd_version2, | |
93 | #if defined(CONFIG_NFSD_V3) | |
94 | [3] = &nfsd_version3, | |
95 | #endif | |
96 | #if defined(CONFIG_NFSD_V4) | |
97 | [4] = &nfsd_version4, | |
98 | #endif | |
99 | }; | |
100 | ||
101 | #define NFSD_MINVERS 2 | |
e8c96f8c | 102 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
103 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
104 | ||
105 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
106 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
107 | .pg_next = &nfsd_acl_program, | |
108 | #endif | |
70c3b76c N |
109 | .pg_prog = NFS_PROGRAM, /* program number */ |
110 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
111 | .pg_vers = nfsd_versions, /* version table */ | |
112 | .pg_name = "nfsd", /* program name */ | |
113 | .pg_class = "nfsd", /* authentication class */ | |
114 | .pg_stats = &nfsd_svcstats, /* version table */ | |
115 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
116 | ||
117 | }; | |
118 | ||
35f7a14f BF |
119 | static bool nfsd_supported_minorversions[NFSD_SUPPORTED_MINOR_VERSION + 1] = { |
120 | [0] = 1, | |
121 | [1] = 1, | |
122 | }; | |
8daf220a | 123 | |
6658d3a7 N |
124 | int nfsd_vers(int vers, enum vers_op change) |
125 | { | |
126 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
15ddb4ae | 127 | return 0; |
6658d3a7 N |
128 | switch(change) { |
129 | case NFSD_SET: | |
130 | nfsd_versions[vers] = nfsd_version[vers]; | |
6658d3a7 N |
131 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
132 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 133 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
6658d3a7 | 134 | #endif |
1a8eff6d | 135 | break; |
6658d3a7 N |
136 | case NFSD_CLEAR: |
137 | nfsd_versions[vers] = NULL; | |
138 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
139 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 140 | nfsd_acl_versions[vers] = NULL; |
6658d3a7 N |
141 | #endif |
142 | break; | |
143 | case NFSD_TEST: | |
144 | return nfsd_versions[vers] != NULL; | |
145 | case NFSD_AVAIL: | |
146 | return nfsd_version[vers] != NULL; | |
147 | } | |
148 | return 0; | |
149 | } | |
8daf220a BH |
150 | |
151 | int nfsd_minorversion(u32 minorversion, enum vers_op change) | |
152 | { | |
153 | if (minorversion > NFSD_SUPPORTED_MINOR_VERSION) | |
154 | return -1; | |
155 | switch(change) { | |
156 | case NFSD_SET: | |
35f7a14f | 157 | nfsd_supported_minorversions[minorversion] = true; |
8daf220a BH |
158 | break; |
159 | case NFSD_CLEAR: | |
35f7a14f | 160 | nfsd_supported_minorversions[minorversion] = false; |
8daf220a BH |
161 | break; |
162 | case NFSD_TEST: | |
35f7a14f | 163 | return nfsd_supported_minorversions[minorversion]; |
8daf220a BH |
164 | case NFSD_AVAIL: |
165 | return minorversion <= NFSD_SUPPORTED_MINOR_VERSION; | |
166 | } | |
167 | return 0; | |
168 | } | |
169 | ||
1da177e4 LT |
170 | /* |
171 | * Maximum number of nfsd processes | |
172 | */ | |
173 | #define NFSD_MAXSERVS 8192 | |
174 | ||
9dd9845f | 175 | int nfsd_nrthreads(struct net *net) |
1da177e4 | 176 | { |
c7d106c9 | 177 | int rv = 0; |
9dd9845f SK |
178 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
179 | ||
c7d106c9 | 180 | mutex_lock(&nfsd_mutex); |
9dd9845f SK |
181 | if (nn->nfsd_serv) |
182 | rv = nn->nfsd_serv->sv_nrthreads; | |
c7d106c9 NB |
183 | mutex_unlock(&nfsd_mutex); |
184 | return rv; | |
1da177e4 LT |
185 | } |
186 | ||
db6e182c | 187 | static int nfsd_init_socks(struct net *net) |
59db4a0c BF |
188 | { |
189 | int error; | |
9dd9845f SK |
190 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
191 | ||
192 | if (!list_empty(&nn->nfsd_serv->sv_permsocks)) | |
59db4a0c BF |
193 | return 0; |
194 | ||
9dd9845f | 195 | error = svc_create_xprt(nn->nfsd_serv, "udp", net, PF_INET, NFS_PORT, |
59db4a0c BF |
196 | SVC_SOCK_DEFAULTS); |
197 | if (error < 0) | |
198 | return error; | |
199 | ||
9dd9845f | 200 | error = svc_create_xprt(nn->nfsd_serv, "tcp", net, PF_INET, NFS_PORT, |
59db4a0c BF |
201 | SVC_SOCK_DEFAULTS); |
202 | if (error < 0) | |
203 | return error; | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
4539f149 | 208 | static int nfsd_users = 0; |
4ad9a344 | 209 | |
bda9cac1 SK |
210 | static int nfsd_startup_generic(int nrservs) |
211 | { | |
212 | int ret; | |
213 | ||
4539f149 | 214 | if (nfsd_users++) |
bda9cac1 SK |
215 | return 0; |
216 | ||
217 | /* | |
218 | * Readahead param cache - will no-op if it already exists. | |
219 | * (Note therefore results will be suboptimal if number of | |
220 | * threads is modified after nfsd start.) | |
221 | */ | |
222 | ret = nfsd_racache_init(2*nrservs); | |
223 | if (ret) | |
224 | return ret; | |
225 | ret = nfs4_state_start(); | |
226 | if (ret) | |
227 | goto out_racache; | |
228 | return 0; | |
229 | ||
230 | out_racache: | |
231 | nfsd_racache_shutdown(); | |
232 | return ret; | |
233 | } | |
234 | ||
235 | static void nfsd_shutdown_generic(void) | |
236 | { | |
4539f149 SK |
237 | if (--nfsd_users) |
238 | return; | |
239 | ||
bda9cac1 SK |
240 | nfs4_state_shutdown(); |
241 | nfsd_racache_shutdown(); | |
242 | } | |
243 | ||
8ef66714 KM |
244 | static bool nfsd_needs_lockd(void) |
245 | { | |
ff88825f | 246 | #if defined(CONFIG_NFSD_V3) |
8ef66714 | 247 | return (nfsd_versions[2] != NULL) || (nfsd_versions[3] != NULL); |
ff88825f KM |
248 | #else |
249 | return (nfsd_versions[2] != NULL); | |
250 | #endif | |
8ef66714 KM |
251 | } |
252 | ||
903d9bf0 | 253 | static int nfsd_startup_net(int nrservs, struct net *net) |
6ff50b3d | 254 | { |
2c2fe290 | 255 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
6ff50b3d SK |
256 | int ret; |
257 | ||
2c2fe290 SK |
258 | if (nn->nfsd_net_up) |
259 | return 0; | |
260 | ||
903d9bf0 | 261 | ret = nfsd_startup_generic(nrservs); |
6ff50b3d SK |
262 | if (ret) |
263 | return ret; | |
903d9bf0 SK |
264 | ret = nfsd_init_socks(net); |
265 | if (ret) | |
266 | goto out_socks; | |
8ef66714 KM |
267 | |
268 | if (nfsd_needs_lockd() && !nn->lockd_up) { | |
269 | ret = lockd_up(net); | |
270 | if (ret) | |
271 | goto out_socks; | |
272 | nn->lockd_up = 1; | |
273 | } | |
274 | ||
6ff50b3d SK |
275 | ret = nfs4_state_start_net(net); |
276 | if (ret) | |
277 | goto out_lockd; | |
278 | ||
2c2fe290 | 279 | nn->nfsd_net_up = true; |
6ff50b3d SK |
280 | return 0; |
281 | ||
282 | out_lockd: | |
8ef66714 KM |
283 | if (nn->lockd_up) { |
284 | lockd_down(net); | |
285 | nn->lockd_up = 0; | |
286 | } | |
903d9bf0 | 287 | out_socks: |
bda9cac1 | 288 | nfsd_shutdown_generic(); |
4ad9a344 JL |
289 | return ret; |
290 | } | |
291 | ||
6ff50b3d SK |
292 | static void nfsd_shutdown_net(struct net *net) |
293 | { | |
2c2fe290 SK |
294 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
295 | ||
6ff50b3d | 296 | nfs4_state_shutdown_net(net); |
8ef66714 KM |
297 | if (nn->lockd_up) { |
298 | lockd_down(net); | |
299 | nn->lockd_up = 0; | |
300 | } | |
2c2fe290 | 301 | nn->nfsd_net_up = false; |
903d9bf0 | 302 | nfsd_shutdown_generic(); |
6ff50b3d SK |
303 | } |
304 | ||
541e864f | 305 | static void nfsd_last_thread(struct svc_serv *serv, struct net *net) |
4ad9a344 | 306 | { |
903d9bf0 SK |
307 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
308 | ||
4ad9a344 JL |
309 | /* |
310 | * write_ports can create the server without actually starting | |
311 | * any threads--if we get shut down before any threads are | |
312 | * started, then nfsd_last_thread will be run before any of this | |
313 | * other initialization has been done. | |
314 | */ | |
903d9bf0 | 315 | if (!nn->nfsd_net_up) |
4ad9a344 | 316 | return; |
6ff50b3d | 317 | nfsd_shutdown_net(net); |
bc591ccf | 318 | |
5ecebb7c | 319 | svc_rpcb_cleanup(serv, net); |
16d05870 | 320 | |
e096bbc6 JL |
321 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
322 | "cache\n"); | |
b3853e0e | 323 | nfsd_export_flush(net); |
bc591ccf | 324 | } |
6658d3a7 N |
325 | |
326 | void nfsd_reset_versions(void) | |
327 | { | |
328 | int found_one = 0; | |
329 | int i; | |
330 | ||
331 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
332 | if (nfsd_program.pg_vers[i]) | |
333 | found_one = 1; | |
334 | } | |
335 | ||
336 | if (!found_one) { | |
337 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
338 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
339 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
340 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
341 | nfsd_acl_program.pg_vers[i] = | |
342 | nfsd_acl_version[i]; | |
343 | #endif | |
344 | } | |
345 | } | |
346 | ||
c3d06f9c AA |
347 | /* |
348 | * Each session guarantees a negotiated per slot memory cache for replies | |
349 | * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated | |
350 | * NFSv4.1 server might want to use more memory for a DRC than a machine | |
351 | * with mutiple services. | |
352 | * | |
353 | * Impose a hard limit on the number of pages for the DRC which varies | |
354 | * according to the machines free pages. This is of course only a default. | |
355 | * | |
356 | * For now this is a #defined shift which could be under admin control | |
357 | * in the future. | |
358 | */ | |
359 | static void set_max_drc(void) | |
360 | { | |
6a14dd1a | 361 | #define NFSD_DRC_SIZE_SHIFT 10 |
0c193054 AA |
362 | nfsd_drc_max_mem = (nr_free_buffer_pages() |
363 | >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; | |
364 | nfsd_drc_mem_used = 0; | |
4bd9b0f4 | 365 | spin_lock_init(&nfsd_drc_lock); |
697ce9be | 366 | dprintk("%s nfsd_drc_max_mem %lu \n", __func__, nfsd_drc_max_mem); |
c3d06f9c | 367 | } |
bedbdd8b | 368 | |
87b0fc7d | 369 | static int nfsd_get_default_max_blksize(void) |
02a375f0 | 370 | { |
87b0fc7d BF |
371 | struct sysinfo i; |
372 | unsigned long long target; | |
373 | unsigned long ret; | |
bedbdd8b | 374 | |
87b0fc7d | 375 | si_meminfo(&i); |
508f9227 | 376 | target = (i.totalram - i.totalhigh) << PAGE_SHIFT; |
87b0fc7d BF |
377 | /* |
378 | * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig | |
379 | * machines, but only uses 32K on 128M machines. Bottom out at | |
380 | * 8K on 32M and smaller. Of course, this is only a default. | |
381 | */ | |
382 | target >>= 12; | |
383 | ||
384 | ret = NFSSVC_MAXBLKSIZE; | |
385 | while (ret > target && ret >= 8*1024*2) | |
386 | ret /= 2; | |
387 | return ret; | |
388 | } | |
389 | ||
6777436b | 390 | int nfsd_create_serv(struct net *net) |
87b0fc7d | 391 | { |
9793f7c8 | 392 | int error; |
b9c0ef85 | 393 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
9793f7c8 | 394 | |
bedbdd8b | 395 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
9dd9845f SK |
396 | if (nn->nfsd_serv) { |
397 | svc_get(nn->nfsd_serv); | |
02a375f0 N |
398 | return 0; |
399 | } | |
87b0fc7d BF |
400 | if (nfsd_max_blksize == 0) |
401 | nfsd_max_blksize = nfsd_get_default_max_blksize(); | |
e844a7b9 | 402 | nfsd_reset_versions(); |
9dd9845f | 403 | nn->nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
a75c5d01 | 404 | nfsd_last_thread, nfsd, THIS_MODULE); |
9dd9845f | 405 | if (nn->nfsd_serv == NULL) |
628b3687 | 406 | return -ENOMEM; |
bedbdd8b | 407 | |
5b8db00b | 408 | nn->nfsd_serv->sv_maxconn = nn->max_connections; |
9dd9845f | 409 | error = svc_bind(nn->nfsd_serv, net); |
9793f7c8 | 410 | if (error < 0) { |
9dd9845f | 411 | svc_destroy(nn->nfsd_serv); |
9793f7c8 SK |
412 | return error; |
413 | } | |
414 | ||
628b3687 | 415 | set_max_drc(); |
b9c0ef85 | 416 | do_gettimeofday(&nn->nfssvc_boot); /* record boot time */ |
87b0fc7d | 417 | return 0; |
02a375f0 N |
418 | } |
419 | ||
9dd9845f | 420 | int nfsd_nrpools(struct net *net) |
eed2965a | 421 | { |
9dd9845f SK |
422 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
423 | ||
424 | if (nn->nfsd_serv == NULL) | |
eed2965a GB |
425 | return 0; |
426 | else | |
9dd9845f | 427 | return nn->nfsd_serv->sv_nrpools; |
eed2965a GB |
428 | } |
429 | ||
9dd9845f | 430 | int nfsd_get_nrthreads(int n, int *nthreads, struct net *net) |
eed2965a GB |
431 | { |
432 | int i = 0; | |
9dd9845f | 433 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
eed2965a | 434 | |
9dd9845f SK |
435 | if (nn->nfsd_serv != NULL) { |
436 | for (i = 0; i < nn->nfsd_serv->sv_nrpools && i < n; i++) | |
437 | nthreads[i] = nn->nfsd_serv->sv_pools[i].sp_nrthreads; | |
eed2965a GB |
438 | } |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
9dd9845f SK |
443 | void nfsd_destroy(struct net *net) |
444 | { | |
445 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
446 | int destroy = (nn->nfsd_serv->sv_nrthreads == 1); | |
447 | ||
448 | if (destroy) | |
449 | svc_shutdown_net(nn->nfsd_serv, net); | |
450 | svc_destroy(nn->nfsd_serv); | |
451 | if (destroy) | |
452 | nn->nfsd_serv = NULL; | |
453 | } | |
454 | ||
3938a0d5 | 455 | int nfsd_set_nrthreads(int n, int *nthreads, struct net *net) |
eed2965a GB |
456 | { |
457 | int i = 0; | |
458 | int tot = 0; | |
459 | int err = 0; | |
9dd9845f | 460 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
eed2965a | 461 | |
bedbdd8b NB |
462 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
463 | ||
9dd9845f | 464 | if (nn->nfsd_serv == NULL || n <= 0) |
eed2965a GB |
465 | return 0; |
466 | ||
9dd9845f SK |
467 | if (n > nn->nfsd_serv->sv_nrpools) |
468 | n = nn->nfsd_serv->sv_nrpools; | |
eed2965a GB |
469 | |
470 | /* enforce a global maximum number of threads */ | |
471 | tot = 0; | |
472 | for (i = 0; i < n; i++) { | |
3c7aa15d | 473 | nthreads[i] = min(nthreads[i], NFSD_MAXSERVS); |
eed2965a GB |
474 | tot += nthreads[i]; |
475 | } | |
476 | if (tot > NFSD_MAXSERVS) { | |
477 | /* total too large: scale down requested numbers */ | |
478 | for (i = 0; i < n && tot > 0; i++) { | |
479 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
480 | tot -= (nthreads[i] - new); | |
481 | nthreads[i] = new; | |
482 | } | |
483 | for (i = 0; i < n && tot > 0; i++) { | |
484 | nthreads[i]--; | |
485 | tot--; | |
486 | } | |
487 | } | |
488 | ||
489 | /* | |
490 | * There must always be a thread in pool 0; the admin | |
491 | * can't shut down NFS completely using pool_threads. | |
492 | */ | |
493 | if (nthreads[0] == 0) | |
494 | nthreads[0] = 1; | |
495 | ||
496 | /* apply the new numbers */ | |
9dd9845f | 497 | svc_get(nn->nfsd_serv); |
eed2965a | 498 | for (i = 0; i < n; i++) { |
9dd9845f | 499 | err = svc_set_num_threads(nn->nfsd_serv, &nn->nfsd_serv->sv_pools[i], |
eed2965a GB |
500 | nthreads[i]); |
501 | if (err) | |
502 | break; | |
503 | } | |
19f7e2ca | 504 | nfsd_destroy(net); |
eed2965a GB |
505 | return err; |
506 | } | |
507 | ||
ac77efbe JL |
508 | /* |
509 | * Adjust the number of threads and return the new number of threads. | |
510 | * This is also the function that starts the server if necessary, if | |
511 | * this is the first time nrservs is nonzero. | |
512 | */ | |
1da177e4 | 513 | int |
d41a9417 | 514 | nfsd_svc(int nrservs, struct net *net) |
1da177e4 LT |
515 | { |
516 | int error; | |
774f8bbd | 517 | bool nfsd_up_before; |
9dd9845f | 518 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
bedbdd8b NB |
519 | |
520 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 521 | dprintk("nfsd: creating service\n"); |
3c7aa15d KM |
522 | |
523 | nrservs = max(nrservs, 0); | |
524 | nrservs = min(nrservs, NFSD_MAXSERVS); | |
671e1fcf | 525 | error = 0; |
3c7aa15d | 526 | |
9dd9845f | 527 | if (nrservs == 0 && nn->nfsd_serv == NULL) |
671e1fcf N |
528 | goto out; |
529 | ||
6777436b | 530 | error = nfsd_create_serv(net); |
02a375f0 | 531 | if (error) |
774f8bbd BF |
532 | goto out; |
533 | ||
903d9bf0 | 534 | nfsd_up_before = nn->nfsd_net_up; |
774f8bbd | 535 | |
903d9bf0 | 536 | error = nfsd_startup_net(nrservs, net); |
af4718f3 BF |
537 | if (error) |
538 | goto out_destroy; | |
9dd9845f | 539 | error = svc_set_num_threads(nn->nfsd_serv, NULL, nrservs); |
774f8bbd BF |
540 | if (error) |
541 | goto out_shutdown; | |
9dd9845f | 542 | /* We are holding a reference to nn->nfsd_serv which |
af4718f3 BF |
543 | * we don't want to count in the return value, |
544 | * so subtract 1 | |
545 | */ | |
9dd9845f | 546 | error = nn->nfsd_serv->sv_nrthreads - 1; |
4ad9a344 | 547 | out_shutdown: |
774f8bbd | 548 | if (error < 0 && !nfsd_up_before) |
541e864f | 549 | nfsd_shutdown_net(net); |
774f8bbd | 550 | out_destroy: |
19f7e2ca | 551 | nfsd_destroy(net); /* Release server */ |
4ad9a344 | 552 | out: |
bedbdd8b | 553 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
554 | return error; |
555 | } | |
556 | ||
1da177e4 LT |
557 | |
558 | /* | |
559 | * This is the NFS server kernel thread | |
560 | */ | |
9867d76c JL |
561 | static int |
562 | nfsd(void *vrqstp) | |
1da177e4 | 563 | { |
9867d76c | 564 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
88c47666 SK |
565 | struct svc_xprt *perm_sock = list_entry(rqstp->rq_server->sv_permsocks.next, typeof(struct svc_xprt), xpt_list); |
566 | struct net *net = perm_sock->xpt_net; | |
5b8db00b | 567 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
5b444cc9 | 568 | int err; |
1da177e4 LT |
569 | |
570 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 571 | mutex_lock(&nfsd_mutex); |
1da177e4 | 572 | |
9867d76c | 573 | /* At this point, the thread shares current->fs |
1da177e4 LT |
574 | * with the init process. We need to create files with a |
575 | * umask of 0 instead of init's umask. */ | |
3e93cd67 | 576 | if (unshare_fs_struct() < 0) { |
1da177e4 LT |
577 | printk("Unable to start nfsd thread: out of memory\n"); |
578 | goto out; | |
579 | } | |
3e93cd67 | 580 | |
1da177e4 LT |
581 | current->fs->umask = 0; |
582 | ||
9867d76c JL |
583 | /* |
584 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
100766f8 | 585 | * the ones that will bring down the thread |
9867d76c | 586 | */ |
100766f8 JL |
587 | allow_signal(SIGKILL); |
588 | allow_signal(SIGHUP); | |
589 | allow_signal(SIGINT); | |
590 | allow_signal(SIGQUIT); | |
bedbdd8b | 591 | |
1da177e4 | 592 | nfsdstats.th_cnt++; |
bedbdd8b NB |
593 | mutex_unlock(&nfsd_mutex); |
594 | ||
83144186 | 595 | set_freezable(); |
1da177e4 LT |
596 | |
597 | /* | |
598 | * The main request loop | |
599 | */ | |
600 | for (;;) { | |
5b8db00b JL |
601 | /* Update sv_maxconn if it has changed */ |
602 | rqstp->rq_server->sv_maxconn = nn->max_connections; | |
603 | ||
1da177e4 LT |
604 | /* |
605 | * Find a socket with data available and call its | |
606 | * recvfrom routine. | |
607 | */ | |
6fb2b47f | 608 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 609 | ; |
9867d76c | 610 | if (err == -EINTR) |
1da177e4 | 611 | break; |
e0e81739 | 612 | validate_process_creds(); |
6fb2b47f | 613 | svc_process(rqstp); |
e0e81739 | 614 | validate_process_creds(); |
1da177e4 LT |
615 | } |
616 | ||
24e36663 | 617 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 618 | flush_signals(current); |
1da177e4 | 619 | |
bedbdd8b | 620 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
621 | nfsdstats.th_cnt --; |
622 | ||
623 | out: | |
57c8b13e | 624 | rqstp->rq_server = NULL; |
786185b5 | 625 | |
1da177e4 LT |
626 | /* Release the thread */ |
627 | svc_exit_thread(rqstp); | |
628 | ||
88c47666 | 629 | nfsd_destroy(net); |
57c8b13e | 630 | |
1da177e4 | 631 | /* Release module */ |
bedbdd8b | 632 | mutex_unlock(&nfsd_mutex); |
1da177e4 | 633 | module_put_and_exit(0); |
9867d76c | 634 | return 0; |
1da177e4 LT |
635 | } |
636 | ||
32c1eb0c AA |
637 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
638 | { | |
639 | if (nfserr == nfserr_jukebox && vers == 2) | |
640 | return nfserr_dropit; | |
641 | if (nfserr == nfserr_wrongsec && vers < 4) | |
642 | return nfserr_acces; | |
643 | return nfserr; | |
644 | } | |
645 | ||
1da177e4 | 646 | int |
c7afef1f | 647 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
648 | { |
649 | struct svc_procedure *proc; | |
650 | kxdrproc_t xdr; | |
ad451d38 AV |
651 | __be32 nfserr; |
652 | __be32 *nfserrp; | |
1da177e4 LT |
653 | |
654 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
655 | rqstp->rq_vers, rqstp->rq_proc); | |
656 | proc = rqstp->rq_procinfo; | |
657 | ||
1091006c BF |
658 | /* |
659 | * Give the xdr decoder a chance to change this if it wants | |
660 | * (necessary in the NFSv4.0 compound case) | |
661 | */ | |
662 | rqstp->rq_cachetype = proc->pc_cachetype; | |
663 | /* Decode arguments */ | |
664 | xdr = proc->pc_decode; | |
665 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, | |
666 | rqstp->rq_argp)) { | |
667 | dprintk("nfsd: failed to decode arguments!\n"); | |
668 | *statp = rpc_garbage_args; | |
669 | return 1; | |
670 | } | |
671 | ||
1da177e4 | 672 | /* Check whether we have this call in the cache. */ |
1091006c | 673 | switch (nfsd_cache_lookup(rqstp)) { |
1da177e4 LT |
674 | case RC_DROPIT: |
675 | return 0; | |
676 | case RC_REPLY: | |
677 | return 1; | |
678 | case RC_DOIT:; | |
679 | /* do it */ | |
680 | } | |
681 | ||
1da177e4 LT |
682 | /* need to grab the location to store the status, as |
683 | * nfsv4 does some encoding while processing | |
684 | */ | |
685 | nfserrp = rqstp->rq_res.head[0].iov_base | |
686 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 687 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
688 | |
689 | /* Now call the procedure handler, and encode NFS status. */ | |
690 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 691 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
9e701c61 | 692 | if (nfserr == nfserr_dropit || rqstp->rq_dropme) { |
45457e09 | 693 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
694 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
695 | return 0; | |
696 | } | |
697 | ||
698 | if (rqstp->rq_proc != 0) | |
699 | *nfserrp++ = nfserr; | |
700 | ||
701 | /* Encode result. | |
702 | * For NFSv2, additional info is never returned in case of an error. | |
703 | */ | |
704 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
705 | xdr = proc->pc_encode; | |
706 | if (xdr && !xdr(rqstp, nfserrp, | |
707 | rqstp->rq_resp)) { | |
708 | /* Failed to encode result. Release cache entry */ | |
709 | dprintk("nfsd: failed to encode result!\n"); | |
710 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
711 | *statp = rpc_system_err; | |
712 | return 1; | |
713 | } | |
714 | } | |
715 | ||
716 | /* Store reply in cache. */ | |
57d276d7 | 717 | nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1); |
1da177e4 LT |
718 | return 1; |
719 | } | |
03cf6c9f GB |
720 | |
721 | int nfsd_pool_stats_open(struct inode *inode, struct file *file) | |
722 | { | |
ed2d8aed | 723 | int ret; |
11f77942 | 724 | struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id); |
9dd9845f | 725 | |
ed2d8aed | 726 | mutex_lock(&nfsd_mutex); |
9dd9845f | 727 | if (nn->nfsd_serv == NULL) { |
ed2d8aed | 728 | mutex_unlock(&nfsd_mutex); |
03cf6c9f | 729 | return -ENODEV; |
ed2d8aed RY |
730 | } |
731 | /* bump up the psudo refcount while traversing */ | |
9dd9845f SK |
732 | svc_get(nn->nfsd_serv); |
733 | ret = svc_pool_stats_open(nn->nfsd_serv, file); | |
ed2d8aed RY |
734 | mutex_unlock(&nfsd_mutex); |
735 | return ret; | |
736 | } | |
737 | ||
738 | int nfsd_pool_stats_release(struct inode *inode, struct file *file) | |
739 | { | |
740 | int ret = seq_release(inode, file); | |
11f77942 | 741 | struct net *net = inode->i_sb->s_fs_info; |
786185b5 | 742 | |
ed2d8aed RY |
743 | mutex_lock(&nfsd_mutex); |
744 | /* this function really, really should have been called svc_put() */ | |
19f7e2ca | 745 | nfsd_destroy(net); |
ed2d8aed RY |
746 | mutex_unlock(&nfsd_mutex); |
747 | return ret; | |
03cf6c9f | 748 | } |