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> |
1da177e4 | 11 | #include <linux/fs_struct.h> |
c3d06f9c | 12 | #include <linux/swap.h> |
1da177e4 | 13 | |
1da177e4 | 14 | #include <linux/sunrpc/stats.h> |
1da177e4 | 15 | #include <linux/sunrpc/svcsock.h> |
1da177e4 | 16 | #include <linux/lockd/bind.h> |
a257cdd0 | 17 | #include <linux/nfsacl.h> |
ed2d8aed | 18 | #include <linux/seq_file.h> |
9a74af21 BH |
19 | #include "nfsd.h" |
20 | #include "cache.h" | |
0a3adade | 21 | #include "vfs.h" |
1da177e4 LT |
22 | |
23 | #define NFSDDBG_FACILITY NFSDDBG_SVC | |
24 | ||
1da177e4 | 25 | extern struct svc_program nfsd_program; |
9867d76c | 26 | static int nfsd(void *vrqstp); |
1da177e4 | 27 | struct timeval nfssvc_boot; |
1da177e4 | 28 | |
bedbdd8b NB |
29 | /* |
30 | * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members | |
31 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some | |
32 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt | |
33 | * | |
34 | * If (out side the lock) nfsd_serv is non-NULL, then it must point to a | |
35 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number | |
36 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each | |
37 | * entry of ->sv_pools[]. | |
38 | * | |
39 | * Transitions of the thread count between zero and non-zero are of particular | |
40 | * interest since the svc_serv needs to be created and initialized at that | |
41 | * point, or freed. | |
3dd98a3b JL |
42 | * |
43 | * Finally, the nfsd_mutex also protects some of the global variables that are | |
44 | * accessed when nfsd starts and that are settable via the write_* routines in | |
45 | * nfsctl.c. In particular: | |
46 | * | |
47 | * user_recovery_dirname | |
48 | * user_lease_time | |
49 | * nfsd_versions | |
bedbdd8b NB |
50 | */ |
51 | DEFINE_MUTEX(nfsd_mutex); | |
52 | struct svc_serv *nfsd_serv; | |
53 | ||
4bd9b0f4 AA |
54 | /* |
55 | * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used. | |
56 | * nfsd_drc_max_pages limits the total amount of memory available for | |
57 | * version 4.1 DRC caches. | |
58 | * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage. | |
59 | */ | |
60 | spinlock_t nfsd_drc_lock; | |
0c193054 AA |
61 | unsigned int nfsd_drc_max_mem; |
62 | unsigned int nfsd_drc_mem_used; | |
4bd9b0f4 | 63 | |
3fb803a9 AG |
64 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
65 | static struct svc_stat nfsd_acl_svcstats; | |
66 | static struct svc_version * nfsd_acl_version[] = { | |
67 | [2] = &nfsd_acl_version2, | |
68 | [3] = &nfsd_acl_version3, | |
69 | }; | |
70 | ||
71 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 72 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
73 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
74 | ||
75 | static struct svc_program nfsd_acl_program = { | |
76 | .pg_prog = NFS_ACL_PROGRAM, | |
77 | .pg_nvers = NFSD_ACL_NRVERS, | |
78 | .pg_vers = nfsd_acl_versions, | |
1a8eff6d | 79 | .pg_name = "nfsacl", |
3fb803a9 AG |
80 | .pg_class = "nfsd", |
81 | .pg_stats = &nfsd_acl_svcstats, | |
82 | .pg_authenticate = &svc_set_client, | |
83 | }; | |
84 | ||
85 | static struct svc_stat nfsd_acl_svcstats = { | |
86 | .program = &nfsd_acl_program, | |
87 | }; | |
88 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
89 | ||
70c3b76c N |
90 | static struct svc_version * nfsd_version[] = { |
91 | [2] = &nfsd_version2, | |
92 | #if defined(CONFIG_NFSD_V3) | |
93 | [3] = &nfsd_version3, | |
94 | #endif | |
95 | #if defined(CONFIG_NFSD_V4) | |
96 | [4] = &nfsd_version4, | |
97 | #endif | |
98 | }; | |
99 | ||
100 | #define NFSD_MINVERS 2 | |
e8c96f8c | 101 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
102 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
103 | ||
104 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
105 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
106 | .pg_next = &nfsd_acl_program, | |
107 | #endif | |
70c3b76c N |
108 | .pg_prog = NFS_PROGRAM, /* program number */ |
109 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
110 | .pg_vers = nfsd_versions, /* version table */ | |
111 | .pg_name = "nfsd", /* program name */ | |
112 | .pg_class = "nfsd", /* authentication class */ | |
113 | .pg_stats = &nfsd_svcstats, /* version table */ | |
114 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
115 | ||
116 | }; | |
117 | ||
8daf220a BH |
118 | u32 nfsd_supported_minorversion; |
119 | ||
6658d3a7 N |
120 | int nfsd_vers(int vers, enum vers_op change) |
121 | { | |
122 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
15ddb4ae | 123 | return 0; |
6658d3a7 N |
124 | switch(change) { |
125 | case NFSD_SET: | |
126 | nfsd_versions[vers] = nfsd_version[vers]; | |
6658d3a7 N |
127 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
128 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 129 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
6658d3a7 | 130 | #endif |
1a8eff6d | 131 | break; |
6658d3a7 N |
132 | case NFSD_CLEAR: |
133 | nfsd_versions[vers] = NULL; | |
134 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
135 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 136 | nfsd_acl_versions[vers] = NULL; |
6658d3a7 N |
137 | #endif |
138 | break; | |
139 | case NFSD_TEST: | |
140 | return nfsd_versions[vers] != NULL; | |
141 | case NFSD_AVAIL: | |
142 | return nfsd_version[vers] != NULL; | |
143 | } | |
144 | return 0; | |
145 | } | |
8daf220a BH |
146 | |
147 | int nfsd_minorversion(u32 minorversion, enum vers_op change) | |
148 | { | |
149 | if (minorversion > NFSD_SUPPORTED_MINOR_VERSION) | |
150 | return -1; | |
151 | switch(change) { | |
152 | case NFSD_SET: | |
153 | nfsd_supported_minorversion = minorversion; | |
154 | break; | |
155 | case NFSD_CLEAR: | |
156 | if (minorversion == 0) | |
157 | return -1; | |
158 | nfsd_supported_minorversion = minorversion - 1; | |
159 | break; | |
160 | case NFSD_TEST: | |
161 | return minorversion <= nfsd_supported_minorversion; | |
162 | case NFSD_AVAIL: | |
163 | return minorversion <= NFSD_SUPPORTED_MINOR_VERSION; | |
164 | } | |
165 | return 0; | |
166 | } | |
167 | ||
1da177e4 LT |
168 | /* |
169 | * Maximum number of nfsd processes | |
170 | */ | |
171 | #define NFSD_MAXSERVS 8192 | |
172 | ||
173 | int nfsd_nrthreads(void) | |
174 | { | |
c7d106c9 NB |
175 | int rv = 0; |
176 | mutex_lock(&nfsd_mutex); | |
177 | if (nfsd_serv) | |
178 | rv = nfsd_serv->sv_nrthreads; | |
179 | mutex_unlock(&nfsd_mutex); | |
180 | return rv; | |
1da177e4 LT |
181 | } |
182 | ||
59db4a0c BF |
183 | static int nfsd_init_socks(int port) |
184 | { | |
185 | int error; | |
186 | if (!list_empty(&nfsd_serv->sv_permsocks)) | |
187 | return 0; | |
188 | ||
189 | error = svc_create_xprt(nfsd_serv, "udp", PF_INET, port, | |
190 | SVC_SOCK_DEFAULTS); | |
191 | if (error < 0) | |
192 | return error; | |
193 | ||
194 | error = svc_create_xprt(nfsd_serv, "tcp", PF_INET, port, | |
195 | SVC_SOCK_DEFAULTS); | |
196 | if (error < 0) | |
197 | return error; | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
4ad9a344 JL |
202 | static bool nfsd_up = false; |
203 | ||
204 | static int nfsd_startup(unsigned short port, int nrservs) | |
205 | { | |
206 | int ret; | |
59db4a0c BF |
207 | /* |
208 | * Readahead param cache - will no-op if it already exists. | |
209 | * (Note therefore results will be suboptimal if number of | |
210 | * threads is modified after nfsd start.) | |
211 | */ | |
212 | ret = nfsd_racache_init(2*nrservs); | |
213 | if (ret) | |
214 | return ret; | |
215 | ret = nfsd_init_socks(port); | |
216 | if (ret) | |
217 | goto out_racache; | |
ac77efbe JL |
218 | ret = lockd_up(); |
219 | if (ret) | |
220 | return ret; | |
4ad9a344 | 221 | ret = nfs4_state_start(); |
ac77efbe JL |
222 | if (ret) |
223 | goto out_lockd; | |
59db4a0c | 224 | nfsd_reset_versions(); |
4ad9a344 | 225 | nfsd_up = true; |
ac77efbe JL |
226 | return 0; |
227 | out_lockd: | |
228 | lockd_down(); | |
59db4a0c BF |
229 | out_racache: |
230 | nfsd_racache_shutdown(); | |
4ad9a344 JL |
231 | return ret; |
232 | } | |
233 | ||
234 | static void nfsd_shutdown(void) | |
235 | { | |
236 | /* | |
237 | * write_ports can create the server without actually starting | |
238 | * any threads--if we get shut down before any threads are | |
239 | * started, then nfsd_last_thread will be run before any of this | |
240 | * other initialization has been done. | |
241 | */ | |
242 | if (!nfsd_up) | |
243 | return; | |
244 | nfs4_state_shutdown(); | |
59db4a0c BF |
245 | lockd_down(); |
246 | nfsd_racache_shutdown(); | |
4ad9a344 JL |
247 | nfsd_up = false; |
248 | } | |
249 | ||
bc591ccf N |
250 | static void nfsd_last_thread(struct svc_serv *serv) |
251 | { | |
252 | /* When last nfsd thread exits we need to do some clean-up */ | |
253 | nfsd_serv = NULL; | |
4ad9a344 | 254 | nfsd_shutdown(); |
bc591ccf | 255 | |
e096bbc6 JL |
256 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
257 | "cache\n"); | |
258 | nfsd_export_flush(); | |
bc591ccf | 259 | } |
6658d3a7 N |
260 | |
261 | void nfsd_reset_versions(void) | |
262 | { | |
263 | int found_one = 0; | |
264 | int i; | |
265 | ||
266 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
267 | if (nfsd_program.pg_vers[i]) | |
268 | found_one = 1; | |
269 | } | |
270 | ||
271 | if (!found_one) { | |
272 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
273 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
274 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
275 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
276 | nfsd_acl_program.pg_vers[i] = | |
277 | nfsd_acl_version[i]; | |
278 | #endif | |
279 | } | |
280 | } | |
281 | ||
c3d06f9c AA |
282 | /* |
283 | * Each session guarantees a negotiated per slot memory cache for replies | |
284 | * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated | |
285 | * NFSv4.1 server might want to use more memory for a DRC than a machine | |
286 | * with mutiple services. | |
287 | * | |
288 | * Impose a hard limit on the number of pages for the DRC which varies | |
289 | * according to the machines free pages. This is of course only a default. | |
290 | * | |
291 | * For now this is a #defined shift which could be under admin control | |
292 | * in the future. | |
293 | */ | |
294 | static void set_max_drc(void) | |
295 | { | |
6a14dd1a | 296 | #define NFSD_DRC_SIZE_SHIFT 10 |
0c193054 AA |
297 | nfsd_drc_max_mem = (nr_free_buffer_pages() |
298 | >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; | |
299 | nfsd_drc_mem_used = 0; | |
4bd9b0f4 | 300 | spin_lock_init(&nfsd_drc_lock); |
0c193054 | 301 | dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem); |
c3d06f9c | 302 | } |
bedbdd8b | 303 | |
b41b66d6 | 304 | int nfsd_create_serv(void) |
02a375f0 N |
305 | { |
306 | int err = 0; | |
bedbdd8b NB |
307 | |
308 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); | |
02a375f0 | 309 | if (nfsd_serv) { |
9a24ab57 | 310 | svc_get(nfsd_serv); |
02a375f0 N |
311 | return 0; |
312 | } | |
596bbe53 N |
313 | if (nfsd_max_blksize == 0) { |
314 | /* choose a suitable default */ | |
315 | struct sysinfo i; | |
316 | si_meminfo(&i); | |
317 | /* Aim for 1/4096 of memory per thread | |
318 | * This gives 1MB on 4Gig machines | |
319 | * But only uses 32K on 128M machines. | |
320 | * Bottom out at 8K on 32M and smaller. | |
321 | * Of course, this is only a default. | |
322 | */ | |
323 | nfsd_max_blksize = NFSSVC_MAXBLKSIZE; | |
44c55600 | 324 | i.totalram <<= PAGE_SHIFT - 12; |
596bbe53 N |
325 | while (nfsd_max_blksize > i.totalram && |
326 | nfsd_max_blksize >= 8*1024*2) | |
327 | nfsd_max_blksize /= 2; | |
328 | } | |
02a375f0 | 329 | |
e096bbc6 | 330 | nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
a75c5d01 | 331 | nfsd_last_thread, nfsd, THIS_MODULE); |
02a375f0 | 332 | if (nfsd_serv == NULL) |
628b3687 | 333 | return -ENOMEM; |
bedbdd8b | 334 | |
628b3687 | 335 | set_max_drc(); |
02a375f0 N |
336 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
337 | return err; | |
338 | } | |
339 | ||
eed2965a GB |
340 | int nfsd_nrpools(void) |
341 | { | |
342 | if (nfsd_serv == NULL) | |
343 | return 0; | |
344 | else | |
345 | return nfsd_serv->sv_nrpools; | |
346 | } | |
347 | ||
348 | int nfsd_get_nrthreads(int n, int *nthreads) | |
349 | { | |
350 | int i = 0; | |
351 | ||
352 | if (nfsd_serv != NULL) { | |
353 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) | |
354 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; | |
355 | } | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | int nfsd_set_nrthreads(int n, int *nthreads) | |
361 | { | |
362 | int i = 0; | |
363 | int tot = 0; | |
364 | int err = 0; | |
365 | ||
bedbdd8b NB |
366 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
367 | ||
eed2965a GB |
368 | if (nfsd_serv == NULL || n <= 0) |
369 | return 0; | |
370 | ||
371 | if (n > nfsd_serv->sv_nrpools) | |
372 | n = nfsd_serv->sv_nrpools; | |
373 | ||
374 | /* enforce a global maximum number of threads */ | |
375 | tot = 0; | |
376 | for (i = 0; i < n; i++) { | |
377 | if (nthreads[i] > NFSD_MAXSERVS) | |
378 | nthreads[i] = NFSD_MAXSERVS; | |
379 | tot += nthreads[i]; | |
380 | } | |
381 | if (tot > NFSD_MAXSERVS) { | |
382 | /* total too large: scale down requested numbers */ | |
383 | for (i = 0; i < n && tot > 0; i++) { | |
384 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
385 | tot -= (nthreads[i] - new); | |
386 | nthreads[i] = new; | |
387 | } | |
388 | for (i = 0; i < n && tot > 0; i++) { | |
389 | nthreads[i]--; | |
390 | tot--; | |
391 | } | |
392 | } | |
393 | ||
394 | /* | |
395 | * There must always be a thread in pool 0; the admin | |
396 | * can't shut down NFS completely using pool_threads. | |
397 | */ | |
398 | if (nthreads[0] == 0) | |
399 | nthreads[0] = 1; | |
400 | ||
401 | /* apply the new numbers */ | |
eed2965a GB |
402 | svc_get(nfsd_serv); |
403 | for (i = 0; i < n; i++) { | |
404 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], | |
405 | nthreads[i]); | |
406 | if (err) | |
407 | break; | |
408 | } | |
409 | svc_destroy(nfsd_serv); | |
eed2965a GB |
410 | |
411 | return err; | |
412 | } | |
413 | ||
ac77efbe JL |
414 | /* |
415 | * Adjust the number of threads and return the new number of threads. | |
416 | * This is also the function that starts the server if necessary, if | |
417 | * this is the first time nrservs is nonzero. | |
418 | */ | |
1da177e4 LT |
419 | int |
420 | nfsd_svc(unsigned short port, int nrservs) | |
421 | { | |
422 | int error; | |
4ad9a344 | 423 | bool first_thread; |
bedbdd8b NB |
424 | |
425 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 426 | dprintk("nfsd: creating service\n"); |
1da177e4 LT |
427 | if (nrservs <= 0) |
428 | nrservs = 0; | |
429 | if (nrservs > NFSD_MAXSERVS) | |
430 | nrservs = NFSD_MAXSERVS; | |
671e1fcf N |
431 | error = 0; |
432 | if (nrservs == 0 && nfsd_serv == NULL) | |
433 | goto out; | |
434 | ||
4ad9a344 JL |
435 | first_thread = (nfsd_serv->sv_nrthreads == 0) && (nrservs != 0); |
436 | ||
437 | if (first_thread) { | |
438 | error = nfsd_startup(port, nrservs); | |
439 | if (error) | |
440 | goto out; | |
441 | } | |
02a375f0 | 442 | error = nfsd_create_serv(); |
02a375f0 | 443 | if (error) |
4ad9a344 | 444 | goto out_shutdown; |
eec09661 | 445 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
82e12fe9 N |
446 | if (error == 0) |
447 | /* We are holding a reference to nfsd_serv which | |
448 | * we don't want to count in the return value, | |
449 | * so subtract 1 | |
450 | */ | |
451 | error = nfsd_serv->sv_nrthreads - 1; | |
4ad9a344 | 452 | out_destroy: |
1da177e4 | 453 | svc_destroy(nfsd_serv); /* Release server */ |
4ad9a344 JL |
454 | out_shutdown: |
455 | if (error < 0 && first_thread) | |
456 | nfsd_shutdown(); | |
457 | out: | |
bedbdd8b | 458 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
459 | return error; |
460 | } | |
461 | ||
1da177e4 LT |
462 | |
463 | /* | |
464 | * This is the NFS server kernel thread | |
465 | */ | |
9867d76c JL |
466 | static int |
467 | nfsd(void *vrqstp) | |
1da177e4 | 468 | { |
9867d76c | 469 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
9867d76c | 470 | int err, preverr = 0; |
1da177e4 LT |
471 | |
472 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 473 | mutex_lock(&nfsd_mutex); |
1da177e4 | 474 | |
9867d76c | 475 | /* At this point, the thread shares current->fs |
1da177e4 LT |
476 | * with the init process. We need to create files with a |
477 | * umask of 0 instead of init's umask. */ | |
3e93cd67 | 478 | if (unshare_fs_struct() < 0) { |
1da177e4 LT |
479 | printk("Unable to start nfsd thread: out of memory\n"); |
480 | goto out; | |
481 | } | |
3e93cd67 | 482 | |
1da177e4 LT |
483 | current->fs->umask = 0; |
484 | ||
9867d76c JL |
485 | /* |
486 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
100766f8 | 487 | * the ones that will bring down the thread |
9867d76c | 488 | */ |
100766f8 JL |
489 | allow_signal(SIGKILL); |
490 | allow_signal(SIGHUP); | |
491 | allow_signal(SIGINT); | |
492 | allow_signal(SIGQUIT); | |
bedbdd8b | 493 | |
1da177e4 | 494 | nfsdstats.th_cnt++; |
bedbdd8b NB |
495 | mutex_unlock(&nfsd_mutex); |
496 | ||
1da177e4 LT |
497 | /* |
498 | * We want less throttling in balance_dirty_pages() so that nfs to | |
499 | * localhost doesn't cause nfsd to lock up due to all the client's | |
500 | * dirty pages. | |
501 | */ | |
502 | current->flags |= PF_LESS_THROTTLE; | |
83144186 | 503 | set_freezable(); |
1da177e4 LT |
504 | |
505 | /* | |
506 | * The main request loop | |
507 | */ | |
508 | for (;;) { | |
1da177e4 LT |
509 | /* |
510 | * Find a socket with data available and call its | |
511 | * recvfrom routine. | |
512 | */ | |
6fb2b47f | 513 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 514 | ; |
9867d76c | 515 | if (err == -EINTR) |
1da177e4 | 516 | break; |
9867d76c JL |
517 | else if (err < 0) { |
518 | if (err != preverr) { | |
519 | printk(KERN_WARNING "%s: unexpected error " | |
520 | "from svc_recv (%d)\n", __func__, -err); | |
521 | preverr = err; | |
522 | } | |
523 | schedule_timeout_uninterruptible(HZ); | |
524 | continue; | |
525 | } | |
526 | ||
1da177e4 LT |
527 | |
528 | /* Lock the export hash tables for reading. */ | |
529 | exp_readlock(); | |
530 | ||
e0e81739 | 531 | validate_process_creds(); |
6fb2b47f | 532 | svc_process(rqstp); |
e0e81739 | 533 | validate_process_creds(); |
1da177e4 LT |
534 | |
535 | /* Unlock export hash tables */ | |
536 | exp_readunlock(); | |
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 | ||
576 | /* Check whether we have this call in the cache. */ | |
577 | switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) { | |
578 | case RC_INTR: | |
579 | case RC_DROPIT: | |
580 | return 0; | |
581 | case RC_REPLY: | |
582 | return 1; | |
583 | case RC_DOIT:; | |
584 | /* do it */ | |
585 | } | |
586 | ||
587 | /* Decode arguments */ | |
588 | xdr = proc->pc_decode; | |
ad451d38 | 589 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, |
1da177e4 LT |
590 | rqstp->rq_argp)) { |
591 | dprintk("nfsd: failed to decode arguments!\n"); | |
592 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
593 | *statp = rpc_garbage_args; | |
594 | return 1; | |
595 | } | |
596 | ||
597 | /* need to grab the location to store the status, as | |
598 | * nfsv4 does some encoding while processing | |
599 | */ | |
600 | nfserrp = rqstp->rq_res.head[0].iov_base | |
601 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 602 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
603 | |
604 | /* Now call the procedure handler, and encode NFS status. */ | |
605 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 606 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
1da177e4 | 607 | if (nfserr == nfserr_dropit) { |
45457e09 | 608 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
609 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
610 | return 0; | |
611 | } | |
612 | ||
613 | if (rqstp->rq_proc != 0) | |
614 | *nfserrp++ = nfserr; | |
615 | ||
616 | /* Encode result. | |
617 | * For NFSv2, additional info is never returned in case of an error. | |
618 | */ | |
619 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
620 | xdr = proc->pc_encode; | |
621 | if (xdr && !xdr(rqstp, nfserrp, | |
622 | rqstp->rq_resp)) { | |
623 | /* Failed to encode result. Release cache entry */ | |
624 | dprintk("nfsd: failed to encode result!\n"); | |
625 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
626 | *statp = rpc_system_err; | |
627 | return 1; | |
628 | } | |
629 | } | |
630 | ||
631 | /* Store reply in cache. */ | |
632 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); | |
633 | return 1; | |
634 | } | |
03cf6c9f GB |
635 | |
636 | int nfsd_pool_stats_open(struct inode *inode, struct file *file) | |
637 | { | |
ed2d8aed RY |
638 | int ret; |
639 | mutex_lock(&nfsd_mutex); | |
640 | if (nfsd_serv == NULL) { | |
641 | mutex_unlock(&nfsd_mutex); | |
03cf6c9f | 642 | return -ENODEV; |
ed2d8aed RY |
643 | } |
644 | /* bump up the psudo refcount while traversing */ | |
645 | svc_get(nfsd_serv); | |
646 | ret = svc_pool_stats_open(nfsd_serv, file); | |
647 | mutex_unlock(&nfsd_mutex); | |
648 | return ret; | |
649 | } | |
650 | ||
651 | int nfsd_pool_stats_release(struct inode *inode, struct file *file) | |
652 | { | |
653 | int ret = seq_release(inode, file); | |
654 | mutex_lock(&nfsd_mutex); | |
655 | /* this function really, really should have been called svc_put() */ | |
656 | svc_destroy(nfsd_serv); | |
657 | mutex_unlock(&nfsd_mutex); | |
658 | return ret; | |
03cf6c9f | 659 | } |