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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" |
1da177e4 LT |
24 | |
25 | #define NFSDDBG_FACILITY NFSDDBG_SVC | |
26 | ||
1da177e4 | 27 | extern struct svc_program nfsd_program; |
9867d76c | 28 | static int nfsd(void *vrqstp); |
1da177e4 | 29 | struct timeval nfssvc_boot; |
1da177e4 | 30 | |
bedbdd8b NB |
31 | /* |
32 | * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members | |
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 | * | |
36 | * If (out side the lock) nfsd_serv is non-NULL, then it must point to a | |
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); | |
54 | struct svc_serv *nfsd_serv; | |
55 | ||
4bd9b0f4 AA |
56 | /* |
57 | * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used. | |
58 | * nfsd_drc_max_pages limits the total amount of memory available for | |
59 | * version 4.1 DRC caches. | |
60 | * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage. | |
61 | */ | |
62 | spinlock_t nfsd_drc_lock; | |
0c193054 AA |
63 | unsigned int nfsd_drc_max_mem; |
64 | unsigned int nfsd_drc_mem_used; | |
4bd9b0f4 | 65 | |
3fb803a9 AG |
66 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
67 | static struct svc_stat nfsd_acl_svcstats; | |
68 | static struct svc_version * nfsd_acl_version[] = { | |
69 | [2] = &nfsd_acl_version2, | |
70 | [3] = &nfsd_acl_version3, | |
71 | }; | |
72 | ||
73 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 74 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
75 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
76 | ||
77 | static struct svc_program nfsd_acl_program = { | |
78 | .pg_prog = NFS_ACL_PROGRAM, | |
79 | .pg_nvers = NFSD_ACL_NRVERS, | |
80 | .pg_vers = nfsd_acl_versions, | |
1a8eff6d | 81 | .pg_name = "nfsacl", |
3fb803a9 AG |
82 | .pg_class = "nfsd", |
83 | .pg_stats = &nfsd_acl_svcstats, | |
84 | .pg_authenticate = &svc_set_client, | |
85 | }; | |
86 | ||
87 | static struct svc_stat nfsd_acl_svcstats = { | |
88 | .program = &nfsd_acl_program, | |
89 | }; | |
90 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
91 | ||
70c3b76c N |
92 | static struct svc_version * nfsd_version[] = { |
93 | [2] = &nfsd_version2, | |
94 | #if defined(CONFIG_NFSD_V3) | |
95 | [3] = &nfsd_version3, | |
96 | #endif | |
97 | #if defined(CONFIG_NFSD_V4) | |
98 | [4] = &nfsd_version4, | |
99 | #endif | |
100 | }; | |
101 | ||
102 | #define NFSD_MINVERS 2 | |
e8c96f8c | 103 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
104 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
105 | ||
106 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
107 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
108 | .pg_next = &nfsd_acl_program, | |
109 | #endif | |
70c3b76c N |
110 | .pg_prog = NFS_PROGRAM, /* program number */ |
111 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
112 | .pg_vers = nfsd_versions, /* version table */ | |
113 | .pg_name = "nfsd", /* program name */ | |
114 | .pg_class = "nfsd", /* authentication class */ | |
115 | .pg_stats = &nfsd_svcstats, /* version table */ | |
116 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
117 | ||
118 | }; | |
119 | ||
8daf220a BH |
120 | u32 nfsd_supported_minorversion; |
121 | ||
6658d3a7 N |
122 | int nfsd_vers(int vers, enum vers_op change) |
123 | { | |
124 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
15ddb4ae | 125 | return 0; |
6658d3a7 N |
126 | switch(change) { |
127 | case NFSD_SET: | |
128 | nfsd_versions[vers] = nfsd_version[vers]; | |
6658d3a7 N |
129 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
130 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 131 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
6658d3a7 | 132 | #endif |
1a8eff6d | 133 | break; |
6658d3a7 N |
134 | case NFSD_CLEAR: |
135 | nfsd_versions[vers] = NULL; | |
136 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
137 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 138 | nfsd_acl_versions[vers] = NULL; |
6658d3a7 N |
139 | #endif |
140 | break; | |
141 | case NFSD_TEST: | |
142 | return nfsd_versions[vers] != NULL; | |
143 | case NFSD_AVAIL: | |
144 | return nfsd_version[vers] != NULL; | |
145 | } | |
146 | return 0; | |
147 | } | |
8daf220a BH |
148 | |
149 | int nfsd_minorversion(u32 minorversion, enum vers_op change) | |
150 | { | |
151 | if (minorversion > NFSD_SUPPORTED_MINOR_VERSION) | |
152 | return -1; | |
153 | switch(change) { | |
154 | case NFSD_SET: | |
155 | nfsd_supported_minorversion = minorversion; | |
156 | break; | |
157 | case NFSD_CLEAR: | |
158 | if (minorversion == 0) | |
159 | return -1; | |
160 | nfsd_supported_minorversion = minorversion - 1; | |
161 | break; | |
162 | case NFSD_TEST: | |
163 | return minorversion <= nfsd_supported_minorversion; | |
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 | ||
175 | int nfsd_nrthreads(void) | |
176 | { | |
c7d106c9 NB |
177 | int rv = 0; |
178 | mutex_lock(&nfsd_mutex); | |
179 | if (nfsd_serv) | |
180 | rv = nfsd_serv->sv_nrthreads; | |
181 | mutex_unlock(&nfsd_mutex); | |
182 | return rv; | |
1da177e4 LT |
183 | } |
184 | ||
59db4a0c BF |
185 | static int nfsd_init_socks(int port) |
186 | { | |
187 | int error; | |
188 | if (!list_empty(&nfsd_serv->sv_permsocks)) | |
189 | return 0; | |
190 | ||
fc5d00b0 | 191 | error = svc_create_xprt(nfsd_serv, "udp", &init_net, PF_INET, port, |
59db4a0c BF |
192 | SVC_SOCK_DEFAULTS); |
193 | if (error < 0) | |
194 | return error; | |
195 | ||
fc5d00b0 | 196 | error = svc_create_xprt(nfsd_serv, "tcp", &init_net, PF_INET, port, |
59db4a0c BF |
197 | SVC_SOCK_DEFAULTS); |
198 | if (error < 0) | |
199 | return error; | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
4ad9a344 JL |
204 | static bool nfsd_up = false; |
205 | ||
206 | static int nfsd_startup(unsigned short port, int nrservs) | |
207 | { | |
208 | int ret; | |
774f8bbd BF |
209 | |
210 | if (nfsd_up) | |
211 | return 0; | |
59db4a0c BF |
212 | /* |
213 | * Readahead param cache - will no-op if it already exists. | |
214 | * (Note therefore results will be suboptimal if number of | |
215 | * threads is modified after nfsd start.) | |
216 | */ | |
217 | ret = nfsd_racache_init(2*nrservs); | |
218 | if (ret) | |
219 | return ret; | |
220 | ret = nfsd_init_socks(port); | |
221 | if (ret) | |
222 | goto out_racache; | |
ac77efbe JL |
223 | ret = lockd_up(); |
224 | if (ret) | |
774f8bbd | 225 | goto out_racache; |
4ad9a344 | 226 | ret = nfs4_state_start(); |
ac77efbe JL |
227 | if (ret) |
228 | goto out_lockd; | |
4ad9a344 | 229 | nfsd_up = true; |
ac77efbe JL |
230 | return 0; |
231 | out_lockd: | |
232 | lockd_down(); | |
59db4a0c BF |
233 | out_racache: |
234 | nfsd_racache_shutdown(); | |
4ad9a344 JL |
235 | return ret; |
236 | } | |
237 | ||
238 | static void nfsd_shutdown(void) | |
239 | { | |
240 | /* | |
241 | * write_ports can create the server without actually starting | |
242 | * any threads--if we get shut down before any threads are | |
243 | * started, then nfsd_last_thread will be run before any of this | |
244 | * other initialization has been done. | |
245 | */ | |
246 | if (!nfsd_up) | |
247 | return; | |
248 | nfs4_state_shutdown(); | |
59db4a0c BF |
249 | lockd_down(); |
250 | nfsd_racache_shutdown(); | |
4ad9a344 JL |
251 | nfsd_up = false; |
252 | } | |
253 | ||
bc591ccf N |
254 | static void nfsd_last_thread(struct svc_serv *serv) |
255 | { | |
256 | /* When last nfsd thread exits we need to do some clean-up */ | |
257 | nfsd_serv = NULL; | |
4ad9a344 | 258 | nfsd_shutdown(); |
bc591ccf | 259 | |
16d05870 SK |
260 | svc_rpcb_cleanup(serv); |
261 | ||
e096bbc6 JL |
262 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
263 | "cache\n"); | |
264 | nfsd_export_flush(); | |
bc591ccf | 265 | } |
6658d3a7 N |
266 | |
267 | void nfsd_reset_versions(void) | |
268 | { | |
269 | int found_one = 0; | |
270 | int i; | |
271 | ||
272 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
273 | if (nfsd_program.pg_vers[i]) | |
274 | found_one = 1; | |
275 | } | |
276 | ||
277 | if (!found_one) { | |
278 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
279 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
280 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
281 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
282 | nfsd_acl_program.pg_vers[i] = | |
283 | nfsd_acl_version[i]; | |
284 | #endif | |
285 | } | |
286 | } | |
287 | ||
c3d06f9c AA |
288 | /* |
289 | * Each session guarantees a negotiated per slot memory cache for replies | |
290 | * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated | |
291 | * NFSv4.1 server might want to use more memory for a DRC than a machine | |
292 | * with mutiple services. | |
293 | * | |
294 | * Impose a hard limit on the number of pages for the DRC which varies | |
295 | * according to the machines free pages. This is of course only a default. | |
296 | * | |
297 | * For now this is a #defined shift which could be under admin control | |
298 | * in the future. | |
299 | */ | |
300 | static void set_max_drc(void) | |
301 | { | |
6a14dd1a | 302 | #define NFSD_DRC_SIZE_SHIFT 10 |
0c193054 AA |
303 | nfsd_drc_max_mem = (nr_free_buffer_pages() |
304 | >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; | |
305 | nfsd_drc_mem_used = 0; | |
4bd9b0f4 | 306 | spin_lock_init(&nfsd_drc_lock); |
0c193054 | 307 | dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem); |
c3d06f9c | 308 | } |
bedbdd8b | 309 | |
b41b66d6 | 310 | int nfsd_create_serv(void) |
02a375f0 N |
311 | { |
312 | int err = 0; | |
bedbdd8b NB |
313 | |
314 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); | |
02a375f0 | 315 | if (nfsd_serv) { |
9a24ab57 | 316 | svc_get(nfsd_serv); |
02a375f0 N |
317 | return 0; |
318 | } | |
596bbe53 N |
319 | if (nfsd_max_blksize == 0) { |
320 | /* choose a suitable default */ | |
321 | struct sysinfo i; | |
322 | si_meminfo(&i); | |
323 | /* Aim for 1/4096 of memory per thread | |
324 | * This gives 1MB on 4Gig machines | |
325 | * But only uses 32K on 128M machines. | |
326 | * Bottom out at 8K on 32M and smaller. | |
327 | * Of course, this is only a default. | |
328 | */ | |
329 | nfsd_max_blksize = NFSSVC_MAXBLKSIZE; | |
44c55600 | 330 | i.totalram <<= PAGE_SHIFT - 12; |
596bbe53 N |
331 | while (nfsd_max_blksize > i.totalram && |
332 | nfsd_max_blksize >= 8*1024*2) | |
333 | nfsd_max_blksize /= 2; | |
334 | } | |
e844a7b9 | 335 | nfsd_reset_versions(); |
02a375f0 | 336 | |
e096bbc6 | 337 | nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
a75c5d01 | 338 | nfsd_last_thread, nfsd, THIS_MODULE); |
02a375f0 | 339 | if (nfsd_serv == NULL) |
628b3687 | 340 | return -ENOMEM; |
bedbdd8b | 341 | |
628b3687 | 342 | set_max_drc(); |
02a375f0 N |
343 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
344 | return err; | |
345 | } | |
346 | ||
eed2965a GB |
347 | int nfsd_nrpools(void) |
348 | { | |
349 | if (nfsd_serv == NULL) | |
350 | return 0; | |
351 | else | |
352 | return nfsd_serv->sv_nrpools; | |
353 | } | |
354 | ||
355 | int nfsd_get_nrthreads(int n, int *nthreads) | |
356 | { | |
357 | int i = 0; | |
358 | ||
359 | if (nfsd_serv != NULL) { | |
360 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) | |
361 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; | |
362 | } | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | int nfsd_set_nrthreads(int n, int *nthreads) | |
368 | { | |
369 | int i = 0; | |
370 | int tot = 0; | |
371 | int err = 0; | |
372 | ||
bedbdd8b NB |
373 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
374 | ||
eed2965a GB |
375 | if (nfsd_serv == NULL || n <= 0) |
376 | return 0; | |
377 | ||
378 | if (n > nfsd_serv->sv_nrpools) | |
379 | n = nfsd_serv->sv_nrpools; | |
380 | ||
381 | /* enforce a global maximum number of threads */ | |
382 | tot = 0; | |
383 | for (i = 0; i < n; i++) { | |
384 | if (nthreads[i] > NFSD_MAXSERVS) | |
385 | nthreads[i] = NFSD_MAXSERVS; | |
386 | tot += nthreads[i]; | |
387 | } | |
388 | if (tot > NFSD_MAXSERVS) { | |
389 | /* total too large: scale down requested numbers */ | |
390 | for (i = 0; i < n && tot > 0; i++) { | |
391 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
392 | tot -= (nthreads[i] - new); | |
393 | nthreads[i] = new; | |
394 | } | |
395 | for (i = 0; i < n && tot > 0; i++) { | |
396 | nthreads[i]--; | |
397 | tot--; | |
398 | } | |
399 | } | |
400 | ||
401 | /* | |
402 | * There must always be a thread in pool 0; the admin | |
403 | * can't shut down NFS completely using pool_threads. | |
404 | */ | |
405 | if (nthreads[0] == 0) | |
406 | nthreads[0] = 1; | |
407 | ||
408 | /* apply the new numbers */ | |
eed2965a GB |
409 | svc_get(nfsd_serv); |
410 | for (i = 0; i < n; i++) { | |
411 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], | |
412 | nthreads[i]); | |
413 | if (err) | |
414 | break; | |
415 | } | |
416 | svc_destroy(nfsd_serv); | |
eed2965a GB |
417 | |
418 | return err; | |
419 | } | |
420 | ||
ac77efbe JL |
421 | /* |
422 | * Adjust the number of threads and return the new number of threads. | |
423 | * This is also the function that starts the server if necessary, if | |
424 | * this is the first time nrservs is nonzero. | |
425 | */ | |
1da177e4 LT |
426 | int |
427 | nfsd_svc(unsigned short port, int nrservs) | |
428 | { | |
429 | int error; | |
774f8bbd | 430 | bool nfsd_up_before; |
bedbdd8b NB |
431 | |
432 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 433 | dprintk("nfsd: creating service\n"); |
1da177e4 LT |
434 | if (nrservs <= 0) |
435 | nrservs = 0; | |
436 | if (nrservs > NFSD_MAXSERVS) | |
437 | nrservs = NFSD_MAXSERVS; | |
671e1fcf N |
438 | error = 0; |
439 | if (nrservs == 0 && nfsd_serv == NULL) | |
440 | goto out; | |
441 | ||
02a375f0 | 442 | error = nfsd_create_serv(); |
02a375f0 | 443 | if (error) |
774f8bbd BF |
444 | goto out; |
445 | ||
446 | nfsd_up_before = nfsd_up; | |
447 | ||
448 | error = nfsd_startup(port, nrservs); | |
af4718f3 BF |
449 | if (error) |
450 | goto out_destroy; | |
774f8bbd BF |
451 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
452 | if (error) | |
453 | goto out_shutdown; | |
af4718f3 BF |
454 | /* We are holding a reference to nfsd_serv which |
455 | * we don't want to count in the return value, | |
456 | * so subtract 1 | |
457 | */ | |
458 | error = nfsd_serv->sv_nrthreads - 1; | |
4ad9a344 | 459 | out_shutdown: |
774f8bbd | 460 | if (error < 0 && !nfsd_up_before) |
4ad9a344 | 461 | nfsd_shutdown(); |
774f8bbd BF |
462 | out_destroy: |
463 | svc_destroy(nfsd_serv); /* Release server */ | |
4ad9a344 | 464 | out: |
bedbdd8b | 465 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
466 | return error; |
467 | } | |
468 | ||
1da177e4 LT |
469 | |
470 | /* | |
471 | * This is the NFS server kernel thread | |
472 | */ | |
9867d76c JL |
473 | static int |
474 | nfsd(void *vrqstp) | |
1da177e4 | 475 | { |
9867d76c | 476 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
9867d76c | 477 | int err, preverr = 0; |
1da177e4 LT |
478 | |
479 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 480 | mutex_lock(&nfsd_mutex); |
1da177e4 | 481 | |
9867d76c | 482 | /* At this point, the thread shares current->fs |
1da177e4 LT |
483 | * with the init process. We need to create files with a |
484 | * umask of 0 instead of init's umask. */ | |
3e93cd67 | 485 | if (unshare_fs_struct() < 0) { |
1da177e4 LT |
486 | printk("Unable to start nfsd thread: out of memory\n"); |
487 | goto out; | |
488 | } | |
3e93cd67 | 489 | |
1da177e4 LT |
490 | current->fs->umask = 0; |
491 | ||
9867d76c JL |
492 | /* |
493 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
100766f8 | 494 | * the ones that will bring down the thread |
9867d76c | 495 | */ |
100766f8 JL |
496 | allow_signal(SIGKILL); |
497 | allow_signal(SIGHUP); | |
498 | allow_signal(SIGINT); | |
499 | allow_signal(SIGQUIT); | |
bedbdd8b | 500 | |
1da177e4 | 501 | nfsdstats.th_cnt++; |
bedbdd8b NB |
502 | mutex_unlock(&nfsd_mutex); |
503 | ||
1da177e4 LT |
504 | /* |
505 | * We want less throttling in balance_dirty_pages() so that nfs to | |
506 | * localhost doesn't cause nfsd to lock up due to all the client's | |
507 | * dirty pages. | |
508 | */ | |
509 | current->flags |= PF_LESS_THROTTLE; | |
83144186 | 510 | set_freezable(); |
1da177e4 LT |
511 | |
512 | /* | |
513 | * The main request loop | |
514 | */ | |
515 | for (;;) { | |
1da177e4 LT |
516 | /* |
517 | * Find a socket with data available and call its | |
518 | * recvfrom routine. | |
519 | */ | |
6fb2b47f | 520 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 521 | ; |
9867d76c | 522 | if (err == -EINTR) |
1da177e4 | 523 | break; |
9867d76c JL |
524 | else if (err < 0) { |
525 | if (err != preverr) { | |
526 | printk(KERN_WARNING "%s: unexpected error " | |
527 | "from svc_recv (%d)\n", __func__, -err); | |
528 | preverr = err; | |
529 | } | |
530 | schedule_timeout_uninterruptible(HZ); | |
531 | continue; | |
532 | } | |
533 | ||
e0e81739 | 534 | validate_process_creds(); |
6fb2b47f | 535 | svc_process(rqstp); |
e0e81739 | 536 | validate_process_creds(); |
1da177e4 LT |
537 | } |
538 | ||
24e36663 | 539 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 540 | flush_signals(current); |
1da177e4 | 541 | |
bedbdd8b | 542 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
543 | nfsdstats.th_cnt --; |
544 | ||
545 | out: | |
546 | /* Release the thread */ | |
547 | svc_exit_thread(rqstp); | |
548 | ||
549 | /* Release module */ | |
bedbdd8b | 550 | mutex_unlock(&nfsd_mutex); |
1da177e4 | 551 | module_put_and_exit(0); |
9867d76c | 552 | return 0; |
1da177e4 LT |
553 | } |
554 | ||
32c1eb0c AA |
555 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
556 | { | |
557 | if (nfserr == nfserr_jukebox && vers == 2) | |
558 | return nfserr_dropit; | |
559 | if (nfserr == nfserr_wrongsec && vers < 4) | |
560 | return nfserr_acces; | |
561 | return nfserr; | |
562 | } | |
563 | ||
1da177e4 | 564 | int |
c7afef1f | 565 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
566 | { |
567 | struct svc_procedure *proc; | |
568 | kxdrproc_t xdr; | |
ad451d38 AV |
569 | __be32 nfserr; |
570 | __be32 *nfserrp; | |
1da177e4 LT |
571 | |
572 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
573 | rqstp->rq_vers, rqstp->rq_proc); | |
574 | proc = rqstp->rq_procinfo; | |
575 | ||
1091006c BF |
576 | /* |
577 | * Give the xdr decoder a chance to change this if it wants | |
578 | * (necessary in the NFSv4.0 compound case) | |
579 | */ | |
580 | rqstp->rq_cachetype = proc->pc_cachetype; | |
581 | /* Decode arguments */ | |
582 | xdr = proc->pc_decode; | |
583 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, | |
584 | rqstp->rq_argp)) { | |
585 | dprintk("nfsd: failed to decode arguments!\n"); | |
586 | *statp = rpc_garbage_args; | |
587 | return 1; | |
588 | } | |
589 | ||
1da177e4 | 590 | /* Check whether we have this call in the cache. */ |
1091006c | 591 | switch (nfsd_cache_lookup(rqstp)) { |
1da177e4 LT |
592 | case RC_INTR: |
593 | case RC_DROPIT: | |
594 | return 0; | |
595 | case RC_REPLY: | |
596 | return 1; | |
597 | case RC_DOIT:; | |
598 | /* do it */ | |
599 | } | |
600 | ||
1da177e4 LT |
601 | /* need to grab the location to store the status, as |
602 | * nfsv4 does some encoding while processing | |
603 | */ | |
604 | nfserrp = rqstp->rq_res.head[0].iov_base | |
605 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 606 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
607 | |
608 | /* Now call the procedure handler, and encode NFS status. */ | |
609 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 610 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
9e701c61 | 611 | if (nfserr == nfserr_dropit || rqstp->rq_dropme) { |
45457e09 | 612 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
613 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
614 | return 0; | |
615 | } | |
616 | ||
617 | if (rqstp->rq_proc != 0) | |
618 | *nfserrp++ = nfserr; | |
619 | ||
620 | /* Encode result. | |
621 | * For NFSv2, additional info is never returned in case of an error. | |
622 | */ | |
623 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
624 | xdr = proc->pc_encode; | |
625 | if (xdr && !xdr(rqstp, nfserrp, | |
626 | rqstp->rq_resp)) { | |
627 | /* Failed to encode result. Release cache entry */ | |
628 | dprintk("nfsd: failed to encode result!\n"); | |
629 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
630 | *statp = rpc_system_err; | |
631 | return 1; | |
632 | } | |
633 | } | |
634 | ||
635 | /* Store reply in cache. */ | |
636 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); | |
637 | return 1; | |
638 | } | |
03cf6c9f GB |
639 | |
640 | int nfsd_pool_stats_open(struct inode *inode, struct file *file) | |
641 | { | |
ed2d8aed RY |
642 | int ret; |
643 | mutex_lock(&nfsd_mutex); | |
644 | if (nfsd_serv == NULL) { | |
645 | mutex_unlock(&nfsd_mutex); | |
03cf6c9f | 646 | return -ENODEV; |
ed2d8aed RY |
647 | } |
648 | /* bump up the psudo refcount while traversing */ | |
649 | svc_get(nfsd_serv); | |
650 | ret = svc_pool_stats_open(nfsd_serv, file); | |
651 | mutex_unlock(&nfsd_mutex); | |
652 | return ret; | |
653 | } | |
654 | ||
655 | int nfsd_pool_stats_release(struct inode *inode, struct file *file) | |
656 | { | |
657 | int ret = seq_release(inode, file); | |
658 | mutex_lock(&nfsd_mutex); | |
659 | /* this function really, really should have been called svc_put() */ | |
660 | svc_destroy(nfsd_serv); | |
661 | mutex_unlock(&nfsd_mutex); | |
662 | return ret; | |
03cf6c9f | 663 | } |