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