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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Central processing for nfsd. |
3 | * | |
4 | * Authors: Olaf Kirch (okir@monad.swb.de) | |
5 | * | |
6 | * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
e8edc6e0 | 9 | #include <linux/sched.h> |
83144186 | 10 | #include <linux/freezer.h> |
143cb494 | 11 | #include <linux/module.h> |
1da177e4 | 12 | #include <linux/fs_struct.h> |
c3d06f9c | 13 | #include <linux/swap.h> |
1da177e4 | 14 | |
1da177e4 | 15 | #include <linux/sunrpc/stats.h> |
1da177e4 | 16 | #include <linux/sunrpc/svcsock.h> |
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 | struct timeval nfssvc_boot; |
1da177e4 | 31 | |
bedbdd8b NB |
32 | /* |
33 | * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members | |
34 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some | |
35 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt | |
36 | * | |
37 | * If (out side the lock) nfsd_serv is non-NULL, then it must point to a | |
38 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number | |
39 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each | |
40 | * entry of ->sv_pools[]. | |
41 | * | |
42 | * Transitions of the thread count between zero and non-zero are of particular | |
43 | * interest since the svc_serv needs to be created and initialized at that | |
44 | * point, or freed. | |
3dd98a3b JL |
45 | * |
46 | * Finally, the nfsd_mutex also protects some of the global variables that are | |
47 | * accessed when nfsd starts and that are settable via the write_* routines in | |
48 | * nfsctl.c. In particular: | |
49 | * | |
50 | * user_recovery_dirname | |
51 | * user_lease_time | |
52 | * nfsd_versions | |
bedbdd8b NB |
53 | */ |
54 | DEFINE_MUTEX(nfsd_mutex); | |
55 | struct svc_serv *nfsd_serv; | |
56 | ||
4bd9b0f4 AA |
57 | /* |
58 | * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used. | |
59 | * nfsd_drc_max_pages limits the total amount of memory available for | |
60 | * version 4.1 DRC caches. | |
61 | * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage. | |
62 | */ | |
63 | spinlock_t nfsd_drc_lock; | |
0c193054 AA |
64 | unsigned int nfsd_drc_max_mem; |
65 | unsigned int nfsd_drc_mem_used; | |
4bd9b0f4 | 66 | |
3fb803a9 AG |
67 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
68 | static struct svc_stat nfsd_acl_svcstats; | |
69 | static struct svc_version * nfsd_acl_version[] = { | |
70 | [2] = &nfsd_acl_version2, | |
71 | [3] = &nfsd_acl_version3, | |
72 | }; | |
73 | ||
74 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 75 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
76 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
77 | ||
78 | static struct svc_program nfsd_acl_program = { | |
79 | .pg_prog = NFS_ACL_PROGRAM, | |
80 | .pg_nvers = NFSD_ACL_NRVERS, | |
81 | .pg_vers = nfsd_acl_versions, | |
1a8eff6d | 82 | .pg_name = "nfsacl", |
3fb803a9 AG |
83 | .pg_class = "nfsd", |
84 | .pg_stats = &nfsd_acl_svcstats, | |
85 | .pg_authenticate = &svc_set_client, | |
86 | }; | |
87 | ||
88 | static struct svc_stat nfsd_acl_svcstats = { | |
89 | .program = &nfsd_acl_program, | |
90 | }; | |
91 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
92 | ||
70c3b76c N |
93 | static struct svc_version * nfsd_version[] = { |
94 | [2] = &nfsd_version2, | |
95 | #if defined(CONFIG_NFSD_V3) | |
96 | [3] = &nfsd_version3, | |
97 | #endif | |
98 | #if defined(CONFIG_NFSD_V4) | |
99 | [4] = &nfsd_version4, | |
100 | #endif | |
101 | }; | |
102 | ||
103 | #define NFSD_MINVERS 2 | |
e8c96f8c | 104 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
105 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
106 | ||
107 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
108 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
109 | .pg_next = &nfsd_acl_program, | |
110 | #endif | |
70c3b76c N |
111 | .pg_prog = NFS_PROGRAM, /* program number */ |
112 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
113 | .pg_vers = nfsd_versions, /* version table */ | |
114 | .pg_name = "nfsd", /* program name */ | |
115 | .pg_class = "nfsd", /* authentication class */ | |
116 | .pg_stats = &nfsd_svcstats, /* version table */ | |
117 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
118 | ||
119 | }; | |
120 | ||
8daf220a BH |
121 | u32 nfsd_supported_minorversion; |
122 | ||
6658d3a7 N |
123 | int nfsd_vers(int vers, enum vers_op change) |
124 | { | |
125 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
15ddb4ae | 126 | return 0; |
6658d3a7 N |
127 | switch(change) { |
128 | case NFSD_SET: | |
129 | nfsd_versions[vers] = nfsd_version[vers]; | |
6658d3a7 N |
130 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
131 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 132 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
6658d3a7 | 133 | #endif |
1a8eff6d | 134 | break; |
6658d3a7 N |
135 | case NFSD_CLEAR: |
136 | nfsd_versions[vers] = NULL; | |
137 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
138 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 139 | nfsd_acl_versions[vers] = NULL; |
6658d3a7 N |
140 | #endif |
141 | break; | |
142 | case NFSD_TEST: | |
143 | return nfsd_versions[vers] != NULL; | |
144 | case NFSD_AVAIL: | |
145 | return nfsd_version[vers] != NULL; | |
146 | } | |
147 | return 0; | |
148 | } | |
8daf220a BH |
149 | |
150 | int nfsd_minorversion(u32 minorversion, enum vers_op change) | |
151 | { | |
152 | if (minorversion > NFSD_SUPPORTED_MINOR_VERSION) | |
153 | return -1; | |
154 | switch(change) { | |
155 | case NFSD_SET: | |
156 | nfsd_supported_minorversion = minorversion; | |
157 | break; | |
158 | case NFSD_CLEAR: | |
159 | if (minorversion == 0) | |
160 | return -1; | |
161 | nfsd_supported_minorversion = minorversion - 1; | |
162 | break; | |
163 | case NFSD_TEST: | |
164 | return minorversion <= nfsd_supported_minorversion; | |
165 | case NFSD_AVAIL: | |
166 | return minorversion <= NFSD_SUPPORTED_MINOR_VERSION; | |
167 | } | |
168 | return 0; | |
169 | } | |
170 | ||
1da177e4 LT |
171 | /* |
172 | * Maximum number of nfsd processes | |
173 | */ | |
174 | #define NFSD_MAXSERVS 8192 | |
175 | ||
176 | int nfsd_nrthreads(void) | |
177 | { | |
c7d106c9 NB |
178 | int rv = 0; |
179 | mutex_lock(&nfsd_mutex); | |
180 | if (nfsd_serv) | |
181 | rv = nfsd_serv->sv_nrthreads; | |
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; | |
189 | if (!list_empty(&nfsd_serv->sv_permsocks)) | |
190 | return 0; | |
191 | ||
db6e182c | 192 | error = svc_create_xprt(nfsd_serv, "udp", net, PF_INET, NFS_PORT, |
59db4a0c BF |
193 | SVC_SOCK_DEFAULTS); |
194 | if (error < 0) | |
195 | return error; | |
196 | ||
db6e182c | 197 | error = svc_create_xprt(nfsd_serv, "tcp", net, PF_INET, NFS_PORT, |
59db4a0c BF |
198 | SVC_SOCK_DEFAULTS); |
199 | if (error < 0) | |
200 | return error; | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
4ad9a344 JL |
205 | static bool nfsd_up = false; |
206 | ||
6ff50b3d SK |
207 | static int nfsd_startup_net(struct net *net) |
208 | { | |
2c2fe290 | 209 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
6ff50b3d SK |
210 | int ret; |
211 | ||
2c2fe290 SK |
212 | if (nn->nfsd_net_up) |
213 | return 0; | |
214 | ||
6ff50b3d SK |
215 | ret = nfsd_init_socks(net); |
216 | if (ret) | |
217 | return ret; | |
218 | ret = lockd_up(net); | |
219 | if (ret) | |
220 | return ret; | |
221 | ret = nfs4_state_start_net(net); | |
222 | if (ret) | |
223 | goto out_lockd; | |
224 | ||
2c2fe290 | 225 | nn->nfsd_net_up = true; |
6ff50b3d SK |
226 | return 0; |
227 | ||
228 | out_lockd: | |
229 | lockd_down(net); | |
230 | return ret; | |
231 | } | |
232 | ||
db42d1a7 | 233 | static int nfsd_startup(int nrservs, struct net *net) |
4ad9a344 JL |
234 | { |
235 | int ret; | |
774f8bbd BF |
236 | |
237 | if (nfsd_up) | |
238 | return 0; | |
59db4a0c BF |
239 | /* |
240 | * Readahead param cache - will no-op if it already exists. | |
241 | * (Note therefore results will be suboptimal if number of | |
242 | * threads is modified after nfsd start.) | |
243 | */ | |
244 | ret = nfsd_racache_init(2*nrservs); | |
245 | if (ret) | |
246 | return ret; | |
4ad9a344 | 247 | ret = nfs4_state_start(); |
ac77efbe | 248 | if (ret) |
6ff50b3d SK |
249 | goto out_racache; |
250 | ret = nfsd_startup_net(net); | |
f252bc68 | 251 | if (ret) |
6ff50b3d | 252 | goto out_net; |
f252bc68 | 253 | |
4ad9a344 | 254 | nfsd_up = true; |
ac77efbe | 255 | return 0; |
6ff50b3d SK |
256 | |
257 | out_net: | |
f252bc68 | 258 | nfs4_state_shutdown(); |
59db4a0c BF |
259 | out_racache: |
260 | nfsd_racache_shutdown(); | |
4ad9a344 JL |
261 | return ret; |
262 | } | |
263 | ||
6ff50b3d SK |
264 | static void nfsd_shutdown_net(struct net *net) |
265 | { | |
2c2fe290 SK |
266 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
267 | ||
268 | if (!nn->nfsd_net_up) | |
269 | return; | |
270 | ||
6ff50b3d SK |
271 | nfs4_state_shutdown_net(net); |
272 | lockd_down(net); | |
2c2fe290 | 273 | nn->nfsd_net_up = false; |
6ff50b3d SK |
274 | } |
275 | ||
db42d1a7 | 276 | static void nfsd_shutdown(struct net *net) |
4ad9a344 JL |
277 | { |
278 | /* | |
279 | * write_ports can create the server without actually starting | |
280 | * any threads--if we get shut down before any threads are | |
281 | * started, then nfsd_last_thread will be run before any of this | |
282 | * other initialization has been done. | |
283 | */ | |
284 | if (!nfsd_up) | |
285 | return; | |
6ff50b3d | 286 | nfsd_shutdown_net(net); |
4ad9a344 | 287 | nfs4_state_shutdown(); |
59db4a0c | 288 | nfsd_racache_shutdown(); |
4ad9a344 JL |
289 | nfsd_up = false; |
290 | } | |
291 | ||
5ecebb7c | 292 | static void nfsd_last_thread(struct svc_serv *serv, struct net *net) |
bc591ccf | 293 | { |
db42d1a7 | 294 | nfsd_shutdown(net); |
bc591ccf | 295 | |
5ecebb7c | 296 | svc_rpcb_cleanup(serv, net); |
16d05870 | 297 | |
e096bbc6 JL |
298 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
299 | "cache\n"); | |
b3853e0e | 300 | nfsd_export_flush(net); |
bc591ccf | 301 | } |
6658d3a7 N |
302 | |
303 | void nfsd_reset_versions(void) | |
304 | { | |
305 | int found_one = 0; | |
306 | int i; | |
307 | ||
308 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
309 | if (nfsd_program.pg_vers[i]) | |
310 | found_one = 1; | |
311 | } | |
312 | ||
313 | if (!found_one) { | |
314 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
315 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
316 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
317 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
318 | nfsd_acl_program.pg_vers[i] = | |
319 | nfsd_acl_version[i]; | |
320 | #endif | |
321 | } | |
322 | } | |
323 | ||
c3d06f9c AA |
324 | /* |
325 | * Each session guarantees a negotiated per slot memory cache for replies | |
326 | * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated | |
327 | * NFSv4.1 server might want to use more memory for a DRC than a machine | |
328 | * with mutiple services. | |
329 | * | |
330 | * Impose a hard limit on the number of pages for the DRC which varies | |
331 | * according to the machines free pages. This is of course only a default. | |
332 | * | |
333 | * For now this is a #defined shift which could be under admin control | |
334 | * in the future. | |
335 | */ | |
336 | static void set_max_drc(void) | |
337 | { | |
6a14dd1a | 338 | #define NFSD_DRC_SIZE_SHIFT 10 |
0c193054 AA |
339 | nfsd_drc_max_mem = (nr_free_buffer_pages() |
340 | >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; | |
341 | nfsd_drc_mem_used = 0; | |
4bd9b0f4 | 342 | spin_lock_init(&nfsd_drc_lock); |
0c193054 | 343 | dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem); |
c3d06f9c | 344 | } |
bedbdd8b | 345 | |
87b0fc7d | 346 | static int nfsd_get_default_max_blksize(void) |
02a375f0 | 347 | { |
87b0fc7d BF |
348 | struct sysinfo i; |
349 | unsigned long long target; | |
350 | unsigned long ret; | |
bedbdd8b | 351 | |
87b0fc7d | 352 | si_meminfo(&i); |
508f9227 | 353 | target = (i.totalram - i.totalhigh) << PAGE_SHIFT; |
87b0fc7d BF |
354 | /* |
355 | * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig | |
356 | * machines, but only uses 32K on 128M machines. Bottom out at | |
357 | * 8K on 32M and smaller. Of course, this is only a default. | |
358 | */ | |
359 | target >>= 12; | |
360 | ||
361 | ret = NFSSVC_MAXBLKSIZE; | |
362 | while (ret > target && ret >= 8*1024*2) | |
363 | ret /= 2; | |
364 | return ret; | |
365 | } | |
366 | ||
6777436b | 367 | int nfsd_create_serv(struct net *net) |
87b0fc7d | 368 | { |
9793f7c8 SK |
369 | int error; |
370 | ||
bedbdd8b | 371 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
02a375f0 | 372 | if (nfsd_serv) { |
9a24ab57 | 373 | svc_get(nfsd_serv); |
02a375f0 N |
374 | return 0; |
375 | } | |
87b0fc7d BF |
376 | if (nfsd_max_blksize == 0) |
377 | nfsd_max_blksize = nfsd_get_default_max_blksize(); | |
e844a7b9 | 378 | nfsd_reset_versions(); |
e096bbc6 | 379 | nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
a75c5d01 | 380 | nfsd_last_thread, nfsd, THIS_MODULE); |
02a375f0 | 381 | if (nfsd_serv == NULL) |
628b3687 | 382 | return -ENOMEM; |
bedbdd8b | 383 | |
57c8b13e | 384 | error = svc_bind(nfsd_serv, net); |
9793f7c8 SK |
385 | if (error < 0) { |
386 | svc_destroy(nfsd_serv); | |
387 | return error; | |
388 | } | |
389 | ||
628b3687 | 390 | set_max_drc(); |
02a375f0 | 391 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
87b0fc7d | 392 | return 0; |
02a375f0 N |
393 | } |
394 | ||
eed2965a GB |
395 | int nfsd_nrpools(void) |
396 | { | |
397 | if (nfsd_serv == NULL) | |
398 | return 0; | |
399 | else | |
400 | return nfsd_serv->sv_nrpools; | |
401 | } | |
402 | ||
403 | int nfsd_get_nrthreads(int n, int *nthreads) | |
404 | { | |
405 | int i = 0; | |
406 | ||
407 | if (nfsd_serv != NULL) { | |
408 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) | |
409 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; | |
410 | } | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
3938a0d5 | 415 | int nfsd_set_nrthreads(int n, int *nthreads, struct net *net) |
eed2965a GB |
416 | { |
417 | int i = 0; | |
418 | int tot = 0; | |
419 | int err = 0; | |
420 | ||
bedbdd8b NB |
421 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
422 | ||
eed2965a GB |
423 | if (nfsd_serv == NULL || n <= 0) |
424 | return 0; | |
425 | ||
426 | if (n > nfsd_serv->sv_nrpools) | |
427 | n = nfsd_serv->sv_nrpools; | |
428 | ||
429 | /* enforce a global maximum number of threads */ | |
430 | tot = 0; | |
431 | for (i = 0; i < n; i++) { | |
432 | if (nthreads[i] > NFSD_MAXSERVS) | |
433 | nthreads[i] = NFSD_MAXSERVS; | |
434 | tot += nthreads[i]; | |
435 | } | |
436 | if (tot > NFSD_MAXSERVS) { | |
437 | /* total too large: scale down requested numbers */ | |
438 | for (i = 0; i < n && tot > 0; i++) { | |
439 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
440 | tot -= (nthreads[i] - new); | |
441 | nthreads[i] = new; | |
442 | } | |
443 | for (i = 0; i < n && tot > 0; i++) { | |
444 | nthreads[i]--; | |
445 | tot--; | |
446 | } | |
447 | } | |
448 | ||
449 | /* | |
450 | * There must always be a thread in pool 0; the admin | |
451 | * can't shut down NFS completely using pool_threads. | |
452 | */ | |
453 | if (nthreads[0] == 0) | |
454 | nthreads[0] = 1; | |
455 | ||
456 | /* apply the new numbers */ | |
eed2965a GB |
457 | svc_get(nfsd_serv); |
458 | for (i = 0; i < n; i++) { | |
459 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], | |
460 | nthreads[i]); | |
461 | if (err) | |
462 | break; | |
463 | } | |
19f7e2ca | 464 | nfsd_destroy(net); |
eed2965a GB |
465 | return err; |
466 | } | |
467 | ||
ac77efbe JL |
468 | /* |
469 | * Adjust the number of threads and return the new number of threads. | |
470 | * This is also the function that starts the server if necessary, if | |
471 | * this is the first time nrservs is nonzero. | |
472 | */ | |
1da177e4 | 473 | int |
d41a9417 | 474 | nfsd_svc(int nrservs, struct net *net) |
1da177e4 LT |
475 | { |
476 | int error; | |
774f8bbd | 477 | bool nfsd_up_before; |
bedbdd8b NB |
478 | |
479 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 480 | dprintk("nfsd: creating service\n"); |
1da177e4 LT |
481 | if (nrservs <= 0) |
482 | nrservs = 0; | |
483 | if (nrservs > NFSD_MAXSERVS) | |
484 | nrservs = NFSD_MAXSERVS; | |
671e1fcf N |
485 | error = 0; |
486 | if (nrservs == 0 && nfsd_serv == NULL) | |
487 | goto out; | |
488 | ||
6777436b | 489 | error = nfsd_create_serv(net); |
02a375f0 | 490 | if (error) |
774f8bbd BF |
491 | goto out; |
492 | ||
493 | nfsd_up_before = nfsd_up; | |
494 | ||
db42d1a7 | 495 | error = nfsd_startup(nrservs, net); |
af4718f3 BF |
496 | if (error) |
497 | goto out_destroy; | |
774f8bbd BF |
498 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
499 | if (error) | |
500 | goto out_shutdown; | |
af4718f3 BF |
501 | /* We are holding a reference to nfsd_serv which |
502 | * we don't want to count in the return value, | |
503 | * so subtract 1 | |
504 | */ | |
505 | error = nfsd_serv->sv_nrthreads - 1; | |
4ad9a344 | 506 | out_shutdown: |
774f8bbd | 507 | if (error < 0 && !nfsd_up_before) |
db42d1a7 | 508 | nfsd_shutdown(net); |
774f8bbd | 509 | out_destroy: |
19f7e2ca | 510 | nfsd_destroy(net); /* Release server */ |
4ad9a344 | 511 | out: |
bedbdd8b | 512 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
513 | return error; |
514 | } | |
515 | ||
1da177e4 LT |
516 | |
517 | /* | |
518 | * This is the NFS server kernel thread | |
519 | */ | |
9867d76c JL |
520 | static int |
521 | nfsd(void *vrqstp) | |
1da177e4 | 522 | { |
9867d76c | 523 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
5b444cc9 | 524 | int err; |
1da177e4 LT |
525 | |
526 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 527 | mutex_lock(&nfsd_mutex); |
1da177e4 | 528 | |
9867d76c | 529 | /* At this point, the thread shares current->fs |
1da177e4 LT |
530 | * with the init process. We need to create files with a |
531 | * umask of 0 instead of init's umask. */ | |
3e93cd67 | 532 | if (unshare_fs_struct() < 0) { |
1da177e4 LT |
533 | printk("Unable to start nfsd thread: out of memory\n"); |
534 | goto out; | |
535 | } | |
3e93cd67 | 536 | |
1da177e4 LT |
537 | current->fs->umask = 0; |
538 | ||
9867d76c JL |
539 | /* |
540 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
100766f8 | 541 | * the ones that will bring down the thread |
9867d76c | 542 | */ |
100766f8 JL |
543 | allow_signal(SIGKILL); |
544 | allow_signal(SIGHUP); | |
545 | allow_signal(SIGINT); | |
546 | allow_signal(SIGQUIT); | |
bedbdd8b | 547 | |
1da177e4 | 548 | nfsdstats.th_cnt++; |
bedbdd8b NB |
549 | mutex_unlock(&nfsd_mutex); |
550 | ||
1da177e4 LT |
551 | /* |
552 | * We want less throttling in balance_dirty_pages() so that nfs to | |
553 | * localhost doesn't cause nfsd to lock up due to all the client's | |
554 | * dirty pages. | |
555 | */ | |
556 | current->flags |= PF_LESS_THROTTLE; | |
83144186 | 557 | set_freezable(); |
1da177e4 LT |
558 | |
559 | /* | |
560 | * The main request loop | |
561 | */ | |
562 | for (;;) { | |
1da177e4 LT |
563 | /* |
564 | * Find a socket with data available and call its | |
565 | * recvfrom routine. | |
566 | */ | |
6fb2b47f | 567 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 568 | ; |
9867d76c | 569 | if (err == -EINTR) |
1da177e4 | 570 | break; |
e0e81739 | 571 | validate_process_creds(); |
6fb2b47f | 572 | svc_process(rqstp); |
e0e81739 | 573 | validate_process_creds(); |
1da177e4 LT |
574 | } |
575 | ||
24e36663 | 576 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 577 | flush_signals(current); |
1da177e4 | 578 | |
bedbdd8b | 579 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
580 | nfsdstats.th_cnt --; |
581 | ||
582 | out: | |
57c8b13e | 583 | rqstp->rq_server = NULL; |
786185b5 | 584 | |
1da177e4 LT |
585 | /* Release the thread */ |
586 | svc_exit_thread(rqstp); | |
587 | ||
57c8b13e SK |
588 | nfsd_destroy(&init_net); |
589 | ||
1da177e4 | 590 | /* Release module */ |
bedbdd8b | 591 | mutex_unlock(&nfsd_mutex); |
1da177e4 | 592 | module_put_and_exit(0); |
9867d76c | 593 | return 0; |
1da177e4 LT |
594 | } |
595 | ||
32c1eb0c AA |
596 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
597 | { | |
598 | if (nfserr == nfserr_jukebox && vers == 2) | |
599 | return nfserr_dropit; | |
600 | if (nfserr == nfserr_wrongsec && vers < 4) | |
601 | return nfserr_acces; | |
602 | return nfserr; | |
603 | } | |
604 | ||
1da177e4 | 605 | int |
c7afef1f | 606 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
607 | { |
608 | struct svc_procedure *proc; | |
609 | kxdrproc_t xdr; | |
ad451d38 AV |
610 | __be32 nfserr; |
611 | __be32 *nfserrp; | |
1da177e4 LT |
612 | |
613 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
614 | rqstp->rq_vers, rqstp->rq_proc); | |
615 | proc = rqstp->rq_procinfo; | |
616 | ||
1091006c BF |
617 | /* |
618 | * Give the xdr decoder a chance to change this if it wants | |
619 | * (necessary in the NFSv4.0 compound case) | |
620 | */ | |
621 | rqstp->rq_cachetype = proc->pc_cachetype; | |
622 | /* Decode arguments */ | |
623 | xdr = proc->pc_decode; | |
624 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, | |
625 | rqstp->rq_argp)) { | |
626 | dprintk("nfsd: failed to decode arguments!\n"); | |
627 | *statp = rpc_garbage_args; | |
628 | return 1; | |
629 | } | |
630 | ||
1da177e4 | 631 | /* Check whether we have this call in the cache. */ |
1091006c | 632 | switch (nfsd_cache_lookup(rqstp)) { |
1da177e4 LT |
633 | case RC_INTR: |
634 | case RC_DROPIT: | |
635 | return 0; | |
636 | case RC_REPLY: | |
637 | return 1; | |
638 | case RC_DOIT:; | |
639 | /* do it */ | |
640 | } | |
641 | ||
1da177e4 LT |
642 | /* need to grab the location to store the status, as |
643 | * nfsv4 does some encoding while processing | |
644 | */ | |
645 | nfserrp = rqstp->rq_res.head[0].iov_base | |
646 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 647 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
648 | |
649 | /* Now call the procedure handler, and encode NFS status. */ | |
650 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 651 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
9e701c61 | 652 | if (nfserr == nfserr_dropit || rqstp->rq_dropme) { |
45457e09 | 653 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
654 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
655 | return 0; | |
656 | } | |
657 | ||
658 | if (rqstp->rq_proc != 0) | |
659 | *nfserrp++ = nfserr; | |
660 | ||
661 | /* Encode result. | |
662 | * For NFSv2, additional info is never returned in case of an error. | |
663 | */ | |
664 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
665 | xdr = proc->pc_encode; | |
666 | if (xdr && !xdr(rqstp, nfserrp, | |
667 | rqstp->rq_resp)) { | |
668 | /* Failed to encode result. Release cache entry */ | |
669 | dprintk("nfsd: failed to encode result!\n"); | |
670 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
671 | *statp = rpc_system_err; | |
672 | return 1; | |
673 | } | |
674 | } | |
675 | ||
676 | /* Store reply in cache. */ | |
57d276d7 | 677 | nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1); |
1da177e4 LT |
678 | return 1; |
679 | } | |
03cf6c9f GB |
680 | |
681 | int nfsd_pool_stats_open(struct inode *inode, struct file *file) | |
682 | { | |
ed2d8aed RY |
683 | int ret; |
684 | mutex_lock(&nfsd_mutex); | |
685 | if (nfsd_serv == NULL) { | |
686 | mutex_unlock(&nfsd_mutex); | |
03cf6c9f | 687 | return -ENODEV; |
ed2d8aed RY |
688 | } |
689 | /* bump up the psudo refcount while traversing */ | |
690 | svc_get(nfsd_serv); | |
691 | ret = svc_pool_stats_open(nfsd_serv, file); | |
692 | mutex_unlock(&nfsd_mutex); | |
693 | return ret; | |
694 | } | |
695 | ||
696 | int nfsd_pool_stats_release(struct inode *inode, struct file *file) | |
697 | { | |
698 | int ret = seq_release(inode, file); | |
786185b5 SK |
699 | struct net *net = &init_net; |
700 | ||
ed2d8aed RY |
701 | mutex_lock(&nfsd_mutex); |
702 | /* this function really, really should have been called svc_put() */ | |
19f7e2ca | 703 | nfsd_destroy(net); |
ed2d8aed RY |
704 | mutex_unlock(&nfsd_mutex); |
705 | return ret; | |
03cf6c9f | 706 | } |