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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> |
9793f7c8 | 14 | #include <linux/nsproxy.h> |
1da177e4 | 15 | |
1da177e4 | 16 | #include <linux/sunrpc/stats.h> |
1da177e4 | 17 | #include <linux/sunrpc/svcsock.h> |
1da177e4 | 18 | #include <linux/lockd/bind.h> |
a257cdd0 | 19 | #include <linux/nfsacl.h> |
ed2d8aed | 20 | #include <linux/seq_file.h> |
fc5d00b0 | 21 | #include <net/net_namespace.h> |
9a74af21 BH |
22 | #include "nfsd.h" |
23 | #include "cache.h" | |
0a3adade | 24 | #include "vfs.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 | ||
38af2cab | 186 | static int nfsd_init_socks(void) |
59db4a0c BF |
187 | { |
188 | int error; | |
189 | if (!list_empty(&nfsd_serv->sv_permsocks)) | |
190 | return 0; | |
191 | ||
38af2cab | 192 | error = svc_create_xprt(nfsd_serv, "udp", &init_net, PF_INET, NFS_PORT, |
59db4a0c BF |
193 | SVC_SOCK_DEFAULTS); |
194 | if (error < 0) | |
195 | return error; | |
196 | ||
38af2cab | 197 | error = svc_create_xprt(nfsd_serv, "tcp", &init_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 | ||
38af2cab | 207 | static int nfsd_startup(int nrservs) |
4ad9a344 JL |
208 | { |
209 | int ret; | |
774f8bbd BF |
210 | |
211 | if (nfsd_up) | |
212 | return 0; | |
59db4a0c BF |
213 | /* |
214 | * Readahead param cache - will no-op if it already exists. | |
215 | * (Note therefore results will be suboptimal if number of | |
216 | * threads is modified after nfsd start.) | |
217 | */ | |
218 | ret = nfsd_racache_init(2*nrservs); | |
219 | if (ret) | |
220 | return ret; | |
38af2cab | 221 | ret = nfsd_init_socks(); |
59db4a0c BF |
222 | if (ret) |
223 | goto out_racache; | |
e3f70ead | 224 | ret = lockd_up(&init_net); |
ac77efbe | 225 | if (ret) |
774f8bbd | 226 | goto out_racache; |
4ad9a344 | 227 | ret = nfs4_state_start(); |
ac77efbe JL |
228 | if (ret) |
229 | goto out_lockd; | |
4ad9a344 | 230 | nfsd_up = true; |
ac77efbe JL |
231 | return 0; |
232 | out_lockd: | |
e3f70ead | 233 | lockd_down(&init_net); |
59db4a0c BF |
234 | out_racache: |
235 | nfsd_racache_shutdown(); | |
4ad9a344 JL |
236 | return ret; |
237 | } | |
238 | ||
239 | static void nfsd_shutdown(void) | |
240 | { | |
241 | /* | |
242 | * write_ports can create the server without actually starting | |
243 | * any threads--if we get shut down before any threads are | |
244 | * started, then nfsd_last_thread will be run before any of this | |
245 | * other initialization has been done. | |
246 | */ | |
247 | if (!nfsd_up) | |
248 | return; | |
249 | nfs4_state_shutdown(); | |
e3f70ead | 250 | lockd_down(&init_net); |
59db4a0c | 251 | nfsd_racache_shutdown(); |
4ad9a344 JL |
252 | nfsd_up = false; |
253 | } | |
254 | ||
5ecebb7c | 255 | static void nfsd_last_thread(struct svc_serv *serv, struct net *net) |
bc591ccf | 256 | { |
4ad9a344 | 257 | nfsd_shutdown(); |
bc591ccf | 258 | |
5ecebb7c | 259 | svc_rpcb_cleanup(serv, net); |
16d05870 | 260 | |
e096bbc6 JL |
261 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
262 | "cache\n"); | |
b3853e0e | 263 | nfsd_export_flush(net); |
bc591ccf | 264 | } |
6658d3a7 N |
265 | |
266 | void nfsd_reset_versions(void) | |
267 | { | |
268 | int found_one = 0; | |
269 | int i; | |
270 | ||
271 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
272 | if (nfsd_program.pg_vers[i]) | |
273 | found_one = 1; | |
274 | } | |
275 | ||
276 | if (!found_one) { | |
277 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
278 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
279 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
280 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
281 | nfsd_acl_program.pg_vers[i] = | |
282 | nfsd_acl_version[i]; | |
283 | #endif | |
284 | } | |
285 | } | |
286 | ||
c3d06f9c AA |
287 | /* |
288 | * Each session guarantees a negotiated per slot memory cache for replies | |
289 | * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated | |
290 | * NFSv4.1 server might want to use more memory for a DRC than a machine | |
291 | * with mutiple services. | |
292 | * | |
293 | * Impose a hard limit on the number of pages for the DRC which varies | |
294 | * according to the machines free pages. This is of course only a default. | |
295 | * | |
296 | * For now this is a #defined shift which could be under admin control | |
297 | * in the future. | |
298 | */ | |
299 | static void set_max_drc(void) | |
300 | { | |
6a14dd1a | 301 | #define NFSD_DRC_SIZE_SHIFT 10 |
0c193054 AA |
302 | nfsd_drc_max_mem = (nr_free_buffer_pages() |
303 | >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; | |
304 | nfsd_drc_mem_used = 0; | |
4bd9b0f4 | 305 | spin_lock_init(&nfsd_drc_lock); |
0c193054 | 306 | dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem); |
c3d06f9c | 307 | } |
bedbdd8b | 308 | |
87b0fc7d | 309 | static int nfsd_get_default_max_blksize(void) |
02a375f0 | 310 | { |
87b0fc7d BF |
311 | struct sysinfo i; |
312 | unsigned long long target; | |
313 | unsigned long ret; | |
bedbdd8b | 314 | |
87b0fc7d | 315 | si_meminfo(&i); |
508f9227 | 316 | target = (i.totalram - i.totalhigh) << PAGE_SHIFT; |
87b0fc7d BF |
317 | /* |
318 | * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig | |
319 | * machines, but only uses 32K on 128M machines. Bottom out at | |
320 | * 8K on 32M and smaller. Of course, this is only a default. | |
321 | */ | |
322 | target >>= 12; | |
323 | ||
324 | ret = NFSSVC_MAXBLKSIZE; | |
325 | while (ret > target && ret >= 8*1024*2) | |
326 | ret /= 2; | |
327 | return ret; | |
328 | } | |
329 | ||
330 | int nfsd_create_serv(void) | |
331 | { | |
9793f7c8 | 332 | int error; |
57c8b13e | 333 | struct net *net = current->nsproxy->net_ns; |
9793f7c8 | 334 | |
bedbdd8b | 335 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
02a375f0 | 336 | if (nfsd_serv) { |
9a24ab57 | 337 | svc_get(nfsd_serv); |
02a375f0 N |
338 | return 0; |
339 | } | |
87b0fc7d BF |
340 | if (nfsd_max_blksize == 0) |
341 | nfsd_max_blksize = nfsd_get_default_max_blksize(); | |
e844a7b9 | 342 | nfsd_reset_versions(); |
e096bbc6 | 343 | nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
a75c5d01 | 344 | nfsd_last_thread, nfsd, THIS_MODULE); |
02a375f0 | 345 | if (nfsd_serv == NULL) |
628b3687 | 346 | return -ENOMEM; |
bedbdd8b | 347 | |
57c8b13e | 348 | error = svc_bind(nfsd_serv, net); |
9793f7c8 SK |
349 | if (error < 0) { |
350 | svc_destroy(nfsd_serv); | |
351 | return error; | |
352 | } | |
353 | ||
628b3687 | 354 | set_max_drc(); |
02a375f0 | 355 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
87b0fc7d | 356 | return 0; |
02a375f0 N |
357 | } |
358 | ||
eed2965a GB |
359 | int nfsd_nrpools(void) |
360 | { | |
361 | if (nfsd_serv == NULL) | |
362 | return 0; | |
363 | else | |
364 | return nfsd_serv->sv_nrpools; | |
365 | } | |
366 | ||
367 | int nfsd_get_nrthreads(int n, int *nthreads) | |
368 | { | |
369 | int i = 0; | |
370 | ||
371 | if (nfsd_serv != NULL) { | |
372 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) | |
373 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; | |
374 | } | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
379 | int nfsd_set_nrthreads(int n, int *nthreads) | |
380 | { | |
381 | int i = 0; | |
382 | int tot = 0; | |
383 | int err = 0; | |
786185b5 | 384 | struct net *net = &init_net; |
eed2965a | 385 | |
bedbdd8b NB |
386 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
387 | ||
eed2965a GB |
388 | if (nfsd_serv == NULL || n <= 0) |
389 | return 0; | |
390 | ||
391 | if (n > nfsd_serv->sv_nrpools) | |
392 | n = nfsd_serv->sv_nrpools; | |
393 | ||
394 | /* enforce a global maximum number of threads */ | |
395 | tot = 0; | |
396 | for (i = 0; i < n; i++) { | |
397 | if (nthreads[i] > NFSD_MAXSERVS) | |
398 | nthreads[i] = NFSD_MAXSERVS; | |
399 | tot += nthreads[i]; | |
400 | } | |
401 | if (tot > NFSD_MAXSERVS) { | |
402 | /* total too large: scale down requested numbers */ | |
403 | for (i = 0; i < n && tot > 0; i++) { | |
404 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
405 | tot -= (nthreads[i] - new); | |
406 | nthreads[i] = new; | |
407 | } | |
408 | for (i = 0; i < n && tot > 0; i++) { | |
409 | nthreads[i]--; | |
410 | tot--; | |
411 | } | |
412 | } | |
413 | ||
414 | /* | |
415 | * There must always be a thread in pool 0; the admin | |
416 | * can't shut down NFS completely using pool_threads. | |
417 | */ | |
418 | if (nthreads[0] == 0) | |
419 | nthreads[0] = 1; | |
420 | ||
421 | /* apply the new numbers */ | |
eed2965a GB |
422 | svc_get(nfsd_serv); |
423 | for (i = 0; i < n; i++) { | |
424 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], | |
425 | nthreads[i]); | |
426 | if (err) | |
427 | break; | |
428 | } | |
19f7e2ca | 429 | nfsd_destroy(net); |
eed2965a GB |
430 | return err; |
431 | } | |
432 | ||
ac77efbe JL |
433 | /* |
434 | * Adjust the number of threads and return the new number of threads. | |
435 | * This is also the function that starts the server if necessary, if | |
436 | * this is the first time nrservs is nonzero. | |
437 | */ | |
1da177e4 | 438 | int |
38af2cab | 439 | nfsd_svc(int nrservs) |
1da177e4 LT |
440 | { |
441 | int error; | |
774f8bbd | 442 | bool nfsd_up_before; |
786185b5 | 443 | struct net *net = &init_net; |
bedbdd8b NB |
444 | |
445 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 446 | dprintk("nfsd: creating service\n"); |
1da177e4 LT |
447 | if (nrservs <= 0) |
448 | nrservs = 0; | |
449 | if (nrservs > NFSD_MAXSERVS) | |
450 | nrservs = NFSD_MAXSERVS; | |
671e1fcf N |
451 | error = 0; |
452 | if (nrservs == 0 && nfsd_serv == NULL) | |
453 | goto out; | |
454 | ||
02a375f0 | 455 | error = nfsd_create_serv(); |
02a375f0 | 456 | if (error) |
774f8bbd BF |
457 | goto out; |
458 | ||
459 | nfsd_up_before = nfsd_up; | |
460 | ||
38af2cab | 461 | error = nfsd_startup(nrservs); |
af4718f3 BF |
462 | if (error) |
463 | goto out_destroy; | |
774f8bbd BF |
464 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
465 | if (error) | |
466 | goto out_shutdown; | |
af4718f3 BF |
467 | /* We are holding a reference to nfsd_serv which |
468 | * we don't want to count in the return value, | |
469 | * so subtract 1 | |
470 | */ | |
471 | error = nfsd_serv->sv_nrthreads - 1; | |
4ad9a344 | 472 | out_shutdown: |
774f8bbd | 473 | if (error < 0 && !nfsd_up_before) |
4ad9a344 | 474 | nfsd_shutdown(); |
774f8bbd | 475 | out_destroy: |
19f7e2ca | 476 | nfsd_destroy(net); /* Release server */ |
4ad9a344 | 477 | out: |
bedbdd8b | 478 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
479 | return error; |
480 | } | |
481 | ||
1da177e4 LT |
482 | |
483 | /* | |
484 | * This is the NFS server kernel thread | |
485 | */ | |
9867d76c JL |
486 | static int |
487 | nfsd(void *vrqstp) | |
1da177e4 | 488 | { |
9867d76c | 489 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
9867d76c | 490 | int err, preverr = 0; |
1da177e4 LT |
491 | |
492 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 493 | mutex_lock(&nfsd_mutex); |
1da177e4 | 494 | |
9867d76c | 495 | /* At this point, the thread shares current->fs |
1da177e4 LT |
496 | * with the init process. We need to create files with a |
497 | * umask of 0 instead of init's umask. */ | |
3e93cd67 | 498 | if (unshare_fs_struct() < 0) { |
1da177e4 LT |
499 | printk("Unable to start nfsd thread: out of memory\n"); |
500 | goto out; | |
501 | } | |
3e93cd67 | 502 | |
1da177e4 LT |
503 | current->fs->umask = 0; |
504 | ||
9867d76c JL |
505 | /* |
506 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
100766f8 | 507 | * the ones that will bring down the thread |
9867d76c | 508 | */ |
100766f8 JL |
509 | allow_signal(SIGKILL); |
510 | allow_signal(SIGHUP); | |
511 | allow_signal(SIGINT); | |
512 | allow_signal(SIGQUIT); | |
bedbdd8b | 513 | |
1da177e4 | 514 | nfsdstats.th_cnt++; |
bedbdd8b NB |
515 | mutex_unlock(&nfsd_mutex); |
516 | ||
1da177e4 LT |
517 | /* |
518 | * We want less throttling in balance_dirty_pages() so that nfs to | |
519 | * localhost doesn't cause nfsd to lock up due to all the client's | |
520 | * dirty pages. | |
521 | */ | |
522 | current->flags |= PF_LESS_THROTTLE; | |
83144186 | 523 | set_freezable(); |
1da177e4 LT |
524 | |
525 | /* | |
526 | * The main request loop | |
527 | */ | |
528 | for (;;) { | |
1da177e4 LT |
529 | /* |
530 | * Find a socket with data available and call its | |
531 | * recvfrom routine. | |
532 | */ | |
6fb2b47f | 533 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 534 | ; |
9867d76c | 535 | if (err == -EINTR) |
1da177e4 | 536 | break; |
9867d76c JL |
537 | else if (err < 0) { |
538 | if (err != preverr) { | |
539 | printk(KERN_WARNING "%s: unexpected error " | |
540 | "from svc_recv (%d)\n", __func__, -err); | |
541 | preverr = err; | |
542 | } | |
543 | schedule_timeout_uninterruptible(HZ); | |
544 | continue; | |
545 | } | |
546 | ||
e0e81739 | 547 | validate_process_creds(); |
6fb2b47f | 548 | svc_process(rqstp); |
e0e81739 | 549 | validate_process_creds(); |
1da177e4 LT |
550 | } |
551 | ||
24e36663 | 552 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 553 | flush_signals(current); |
1da177e4 | 554 | |
bedbdd8b | 555 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
556 | nfsdstats.th_cnt --; |
557 | ||
558 | out: | |
57c8b13e | 559 | rqstp->rq_server = NULL; |
786185b5 | 560 | |
1da177e4 LT |
561 | /* Release the thread */ |
562 | svc_exit_thread(rqstp); | |
563 | ||
57c8b13e SK |
564 | nfsd_destroy(&init_net); |
565 | ||
1da177e4 | 566 | /* Release module */ |
bedbdd8b | 567 | mutex_unlock(&nfsd_mutex); |
1da177e4 | 568 | module_put_and_exit(0); |
9867d76c | 569 | return 0; |
1da177e4 LT |
570 | } |
571 | ||
32c1eb0c AA |
572 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
573 | { | |
574 | if (nfserr == nfserr_jukebox && vers == 2) | |
575 | return nfserr_dropit; | |
576 | if (nfserr == nfserr_wrongsec && vers < 4) | |
577 | return nfserr_acces; | |
578 | return nfserr; | |
579 | } | |
580 | ||
1da177e4 | 581 | int |
c7afef1f | 582 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
583 | { |
584 | struct svc_procedure *proc; | |
585 | kxdrproc_t xdr; | |
ad451d38 AV |
586 | __be32 nfserr; |
587 | __be32 *nfserrp; | |
1da177e4 LT |
588 | |
589 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
590 | rqstp->rq_vers, rqstp->rq_proc); | |
591 | proc = rqstp->rq_procinfo; | |
592 | ||
1091006c BF |
593 | /* |
594 | * Give the xdr decoder a chance to change this if it wants | |
595 | * (necessary in the NFSv4.0 compound case) | |
596 | */ | |
597 | rqstp->rq_cachetype = proc->pc_cachetype; | |
598 | /* Decode arguments */ | |
599 | xdr = proc->pc_decode; | |
600 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, | |
601 | rqstp->rq_argp)) { | |
602 | dprintk("nfsd: failed to decode arguments!\n"); | |
603 | *statp = rpc_garbage_args; | |
604 | return 1; | |
605 | } | |
606 | ||
1da177e4 | 607 | /* Check whether we have this call in the cache. */ |
1091006c | 608 | switch (nfsd_cache_lookup(rqstp)) { |
1da177e4 LT |
609 | case RC_INTR: |
610 | case RC_DROPIT: | |
611 | return 0; | |
612 | case RC_REPLY: | |
613 | return 1; | |
614 | case RC_DOIT:; | |
615 | /* do it */ | |
616 | } | |
617 | ||
1da177e4 LT |
618 | /* need to grab the location to store the status, as |
619 | * nfsv4 does some encoding while processing | |
620 | */ | |
621 | nfserrp = rqstp->rq_res.head[0].iov_base | |
622 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 623 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
624 | |
625 | /* Now call the procedure handler, and encode NFS status. */ | |
626 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 627 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
9e701c61 | 628 | if (nfserr == nfserr_dropit || rqstp->rq_dropme) { |
45457e09 | 629 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
630 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
631 | return 0; | |
632 | } | |
633 | ||
634 | if (rqstp->rq_proc != 0) | |
635 | *nfserrp++ = nfserr; | |
636 | ||
637 | /* Encode result. | |
638 | * For NFSv2, additional info is never returned in case of an error. | |
639 | */ | |
640 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
641 | xdr = proc->pc_encode; | |
642 | if (xdr && !xdr(rqstp, nfserrp, | |
643 | rqstp->rq_resp)) { | |
644 | /* Failed to encode result. Release cache entry */ | |
645 | dprintk("nfsd: failed to encode result!\n"); | |
646 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
647 | *statp = rpc_system_err; | |
648 | return 1; | |
649 | } | |
650 | } | |
651 | ||
652 | /* Store reply in cache. */ | |
653 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); | |
654 | return 1; | |
655 | } | |
03cf6c9f GB |
656 | |
657 | int nfsd_pool_stats_open(struct inode *inode, struct file *file) | |
658 | { | |
ed2d8aed RY |
659 | int ret; |
660 | mutex_lock(&nfsd_mutex); | |
661 | if (nfsd_serv == NULL) { | |
662 | mutex_unlock(&nfsd_mutex); | |
03cf6c9f | 663 | return -ENODEV; |
ed2d8aed RY |
664 | } |
665 | /* bump up the psudo refcount while traversing */ | |
666 | svc_get(nfsd_serv); | |
667 | ret = svc_pool_stats_open(nfsd_serv, file); | |
668 | mutex_unlock(&nfsd_mutex); | |
669 | return ret; | |
670 | } | |
671 | ||
672 | int nfsd_pool_stats_release(struct inode *inode, struct file *file) | |
673 | { | |
674 | int ret = seq_release(inode, file); | |
786185b5 SK |
675 | struct net *net = &init_net; |
676 | ||
ed2d8aed RY |
677 | mutex_lock(&nfsd_mutex); |
678 | /* this function really, really should have been called svc_put() */ | |
19f7e2ca | 679 | nfsd_destroy(net); |
ed2d8aed RY |
680 | mutex_unlock(&nfsd_mutex); |
681 | return ret; | |
03cf6c9f | 682 | } |