Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfsd/nfssvc.c | |
3 | * | |
4 | * Central processing for nfsd. | |
5 | * | |
6 | * Authors: Olaf Kirch (okir@monad.swb.de) | |
7 | * | |
8 | * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> | |
9 | */ | |
10 | ||
1da177e4 | 11 | #include <linux/module.h> |
e8edc6e0 | 12 | #include <linux/sched.h> |
1da177e4 LT |
13 | #include <linux/time.h> |
14 | #include <linux/errno.h> | |
15 | #include <linux/nfs.h> | |
16 | #include <linux/in.h> | |
17 | #include <linux/uio.h> | |
18 | #include <linux/unistd.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/smp.h> | |
83144186 | 21 | #include <linux/freezer.h> |
1da177e4 | 22 | #include <linux/fs_struct.h> |
9867d76c | 23 | #include <linux/kthread.h> |
c3d06f9c | 24 | #include <linux/swap.h> |
1da177e4 LT |
25 | |
26 | #include <linux/sunrpc/types.h> | |
27 | #include <linux/sunrpc/stats.h> | |
28 | #include <linux/sunrpc/svc.h> | |
29 | #include <linux/sunrpc/svcsock.h> | |
30 | #include <linux/sunrpc/cache.h> | |
31 | #include <linux/nfsd/nfsd.h> | |
32 | #include <linux/nfsd/stats.h> | |
33 | #include <linux/nfsd/cache.h> | |
70c3b76c | 34 | #include <linux/nfsd/syscall.h> |
1da177e4 | 35 | #include <linux/lockd/bind.h> |
a257cdd0 | 36 | #include <linux/nfsacl.h> |
1da177e4 LT |
37 | |
38 | #define NFSDDBG_FACILITY NFSDDBG_SVC | |
39 | ||
1da177e4 | 40 | extern struct svc_program nfsd_program; |
9867d76c | 41 | static int nfsd(void *vrqstp); |
1da177e4 | 42 | struct timeval nfssvc_boot; |
1da177e4 | 43 | |
bedbdd8b NB |
44 | /* |
45 | * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members | |
46 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some | |
47 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt | |
48 | * | |
49 | * If (out side the lock) nfsd_serv is non-NULL, then it must point to a | |
50 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number | |
51 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each | |
52 | * entry of ->sv_pools[]. | |
53 | * | |
54 | * Transitions of the thread count between zero and non-zero are of particular | |
55 | * interest since the svc_serv needs to be created and initialized at that | |
56 | * point, or freed. | |
3dd98a3b JL |
57 | * |
58 | * Finally, the nfsd_mutex also protects some of the global variables that are | |
59 | * accessed when nfsd starts and that are settable via the write_* routines in | |
60 | * nfsctl.c. In particular: | |
61 | * | |
62 | * user_recovery_dirname | |
63 | * user_lease_time | |
64 | * nfsd_versions | |
bedbdd8b NB |
65 | */ |
66 | DEFINE_MUTEX(nfsd_mutex); | |
67 | struct svc_serv *nfsd_serv; | |
68 | ||
3fb803a9 AG |
69 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
70 | static struct svc_stat nfsd_acl_svcstats; | |
71 | static struct svc_version * nfsd_acl_version[] = { | |
72 | [2] = &nfsd_acl_version2, | |
73 | [3] = &nfsd_acl_version3, | |
74 | }; | |
75 | ||
76 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 77 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
78 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
79 | ||
80 | static struct svc_program nfsd_acl_program = { | |
81 | .pg_prog = NFS_ACL_PROGRAM, | |
82 | .pg_nvers = NFSD_ACL_NRVERS, | |
83 | .pg_vers = nfsd_acl_versions, | |
1a8eff6d | 84 | .pg_name = "nfsacl", |
3fb803a9 AG |
85 | .pg_class = "nfsd", |
86 | .pg_stats = &nfsd_acl_svcstats, | |
87 | .pg_authenticate = &svc_set_client, | |
88 | }; | |
89 | ||
90 | static struct svc_stat nfsd_acl_svcstats = { | |
91 | .program = &nfsd_acl_program, | |
92 | }; | |
93 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
94 | ||
70c3b76c N |
95 | static struct svc_version * nfsd_version[] = { |
96 | [2] = &nfsd_version2, | |
97 | #if defined(CONFIG_NFSD_V3) | |
98 | [3] = &nfsd_version3, | |
99 | #endif | |
100 | #if defined(CONFIG_NFSD_V4) | |
101 | [4] = &nfsd_version4, | |
102 | #endif | |
103 | }; | |
104 | ||
105 | #define NFSD_MINVERS 2 | |
e8c96f8c | 106 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
107 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
108 | ||
109 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
110 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
111 | .pg_next = &nfsd_acl_program, | |
112 | #endif | |
70c3b76c N |
113 | .pg_prog = NFS_PROGRAM, /* program number */ |
114 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
115 | .pg_vers = nfsd_versions, /* version table */ | |
116 | .pg_name = "nfsd", /* program name */ | |
117 | .pg_class = "nfsd", /* authentication class */ | |
118 | .pg_stats = &nfsd_svcstats, /* version table */ | |
119 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
120 | ||
121 | }; | |
122 | ||
8daf220a BH |
123 | u32 nfsd_supported_minorversion; |
124 | ||
6658d3a7 N |
125 | int nfsd_vers(int vers, enum vers_op change) |
126 | { | |
127 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
128 | return -1; | |
129 | switch(change) { | |
130 | case NFSD_SET: | |
131 | nfsd_versions[vers] = nfsd_version[vers]; | |
6658d3a7 N |
132 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
133 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 134 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
6658d3a7 | 135 | #endif |
1a8eff6d | 136 | break; |
6658d3a7 N |
137 | case NFSD_CLEAR: |
138 | nfsd_versions[vers] = NULL; | |
139 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
140 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 141 | nfsd_acl_versions[vers] = NULL; |
6658d3a7 N |
142 | #endif |
143 | break; | |
144 | case NFSD_TEST: | |
145 | return nfsd_versions[vers] != NULL; | |
146 | case NFSD_AVAIL: | |
147 | return nfsd_version[vers] != NULL; | |
148 | } | |
149 | return 0; | |
150 | } | |
8daf220a BH |
151 | |
152 | int nfsd_minorversion(u32 minorversion, enum vers_op change) | |
153 | { | |
154 | if (minorversion > NFSD_SUPPORTED_MINOR_VERSION) | |
155 | return -1; | |
156 | switch(change) { | |
157 | case NFSD_SET: | |
158 | nfsd_supported_minorversion = minorversion; | |
159 | break; | |
160 | case NFSD_CLEAR: | |
161 | if (minorversion == 0) | |
162 | return -1; | |
163 | nfsd_supported_minorversion = minorversion - 1; | |
164 | break; | |
165 | case NFSD_TEST: | |
166 | return minorversion <= nfsd_supported_minorversion; | |
167 | case NFSD_AVAIL: | |
168 | return minorversion <= NFSD_SUPPORTED_MINOR_VERSION; | |
169 | } | |
170 | return 0; | |
171 | } | |
172 | ||
1da177e4 LT |
173 | /* |
174 | * Maximum number of nfsd processes | |
175 | */ | |
176 | #define NFSD_MAXSERVS 8192 | |
177 | ||
178 | int nfsd_nrthreads(void) | |
179 | { | |
c7d106c9 NB |
180 | int rv = 0; |
181 | mutex_lock(&nfsd_mutex); | |
182 | if (nfsd_serv) | |
183 | rv = nfsd_serv->sv_nrthreads; | |
184 | mutex_unlock(&nfsd_mutex); | |
185 | return rv; | |
1da177e4 LT |
186 | } |
187 | ||
bc591ccf N |
188 | static void nfsd_last_thread(struct svc_serv *serv) |
189 | { | |
190 | /* When last nfsd thread exits we need to do some clean-up */ | |
7a182083 TT |
191 | struct svc_xprt *xprt; |
192 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) | |
24e36663 | 193 | lockd_down(); |
bc591ccf N |
194 | nfsd_serv = NULL; |
195 | nfsd_racache_shutdown(); | |
196 | nfs4_state_shutdown(); | |
197 | ||
e096bbc6 JL |
198 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
199 | "cache\n"); | |
200 | nfsd_export_flush(); | |
bc591ccf | 201 | } |
6658d3a7 N |
202 | |
203 | void nfsd_reset_versions(void) | |
204 | { | |
205 | int found_one = 0; | |
206 | int i; | |
207 | ||
208 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
209 | if (nfsd_program.pg_vers[i]) | |
210 | found_one = 1; | |
211 | } | |
212 | ||
213 | if (!found_one) { | |
214 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
215 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
216 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
217 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
218 | nfsd_acl_program.pg_vers[i] = | |
219 | nfsd_acl_version[i]; | |
220 | #endif | |
221 | } | |
222 | } | |
223 | ||
c3d06f9c AA |
224 | /* |
225 | * Each session guarantees a negotiated per slot memory cache for replies | |
226 | * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated | |
227 | * NFSv4.1 server might want to use more memory for a DRC than a machine | |
228 | * with mutiple services. | |
229 | * | |
230 | * Impose a hard limit on the number of pages for the DRC which varies | |
231 | * according to the machines free pages. This is of course only a default. | |
232 | * | |
233 | * For now this is a #defined shift which could be under admin control | |
234 | * in the future. | |
235 | */ | |
236 | static void set_max_drc(void) | |
237 | { | |
f0ad670d BH |
238 | /* The percent of nr_free_buffer_pages used by the V4.1 server DRC */ |
239 | #define NFSD_DRC_SIZE_SHIFT 7 | |
c3d06f9c AA |
240 | nfsd_serv->sv_drc_max_pages = nr_free_buffer_pages() |
241 | >> NFSD_DRC_SIZE_SHIFT; | |
242 | nfsd_serv->sv_drc_pages_used = 0; | |
243 | dprintk("%s svc_drc_max_pages %u\n", __func__, | |
244 | nfsd_serv->sv_drc_max_pages); | |
245 | } | |
bedbdd8b | 246 | |
b41b66d6 | 247 | int nfsd_create_serv(void) |
02a375f0 N |
248 | { |
249 | int err = 0; | |
bedbdd8b NB |
250 | |
251 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); | |
02a375f0 | 252 | if (nfsd_serv) { |
9a24ab57 | 253 | svc_get(nfsd_serv); |
02a375f0 N |
254 | return 0; |
255 | } | |
596bbe53 N |
256 | if (nfsd_max_blksize == 0) { |
257 | /* choose a suitable default */ | |
258 | struct sysinfo i; | |
259 | si_meminfo(&i); | |
260 | /* Aim for 1/4096 of memory per thread | |
261 | * This gives 1MB on 4Gig machines | |
262 | * But only uses 32K on 128M machines. | |
263 | * Bottom out at 8K on 32M and smaller. | |
264 | * Of course, this is only a default. | |
265 | */ | |
266 | nfsd_max_blksize = NFSSVC_MAXBLKSIZE; | |
44c55600 | 267 | i.totalram <<= PAGE_SHIFT - 12; |
596bbe53 N |
268 | while (nfsd_max_blksize > i.totalram && |
269 | nfsd_max_blksize >= 8*1024*2) | |
270 | nfsd_max_blksize /= 2; | |
271 | } | |
02a375f0 | 272 | |
e096bbc6 | 273 | nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
a75c5d01 | 274 | nfsd_last_thread, nfsd, THIS_MODULE); |
02a375f0 N |
275 | if (nfsd_serv == NULL) |
276 | err = -ENOMEM; | |
c3d06f9c AA |
277 | else |
278 | set_max_drc(); | |
bedbdd8b | 279 | |
02a375f0 N |
280 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
281 | return err; | |
282 | } | |
283 | ||
284 | static int nfsd_init_socks(int port) | |
285 | { | |
286 | int error; | |
287 | if (!list_empty(&nfsd_serv->sv_permsocks)) | |
288 | return 0; | |
289 | ||
9652ada3 | 290 | error = svc_create_xprt(nfsd_serv, "udp", PF_INET, port, |
482fb94e | 291 | SVC_SOCK_DEFAULTS); |
02a375f0 N |
292 | if (error < 0) |
293 | return error; | |
294 | ||
1cd9cd16 CL |
295 | error = lockd_up(); |
296 | if (error < 0) | |
297 | return error; | |
298 | ||
9652ada3 | 299 | error = svc_create_xprt(nfsd_serv, "tcp", PF_INET, port, |
482fb94e | 300 | SVC_SOCK_DEFAULTS); |
02a375f0 N |
301 | if (error < 0) |
302 | return error; | |
26a41409 CL |
303 | |
304 | error = lockd_up(); | |
305 | if (error < 0) | |
306 | return error; | |
307 | ||
02a375f0 N |
308 | return 0; |
309 | } | |
310 | ||
eed2965a GB |
311 | int nfsd_nrpools(void) |
312 | { | |
313 | if (nfsd_serv == NULL) | |
314 | return 0; | |
315 | else | |
316 | return nfsd_serv->sv_nrpools; | |
317 | } | |
318 | ||
319 | int nfsd_get_nrthreads(int n, int *nthreads) | |
320 | { | |
321 | int i = 0; | |
322 | ||
323 | if (nfsd_serv != NULL) { | |
324 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) | |
325 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; | |
326 | } | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | int nfsd_set_nrthreads(int n, int *nthreads) | |
332 | { | |
333 | int i = 0; | |
334 | int tot = 0; | |
335 | int err = 0; | |
336 | ||
bedbdd8b NB |
337 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
338 | ||
eed2965a GB |
339 | if (nfsd_serv == NULL || n <= 0) |
340 | return 0; | |
341 | ||
342 | if (n > nfsd_serv->sv_nrpools) | |
343 | n = nfsd_serv->sv_nrpools; | |
344 | ||
345 | /* enforce a global maximum number of threads */ | |
346 | tot = 0; | |
347 | for (i = 0; i < n; i++) { | |
348 | if (nthreads[i] > NFSD_MAXSERVS) | |
349 | nthreads[i] = NFSD_MAXSERVS; | |
350 | tot += nthreads[i]; | |
351 | } | |
352 | if (tot > NFSD_MAXSERVS) { | |
353 | /* total too large: scale down requested numbers */ | |
354 | for (i = 0; i < n && tot > 0; i++) { | |
355 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
356 | tot -= (nthreads[i] - new); | |
357 | nthreads[i] = new; | |
358 | } | |
359 | for (i = 0; i < n && tot > 0; i++) { | |
360 | nthreads[i]--; | |
361 | tot--; | |
362 | } | |
363 | } | |
364 | ||
365 | /* | |
366 | * There must always be a thread in pool 0; the admin | |
367 | * can't shut down NFS completely using pool_threads. | |
368 | */ | |
369 | if (nthreads[0] == 0) | |
370 | nthreads[0] = 1; | |
371 | ||
372 | /* apply the new numbers */ | |
eed2965a GB |
373 | svc_get(nfsd_serv); |
374 | for (i = 0; i < n; i++) { | |
375 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], | |
376 | nthreads[i]); | |
377 | if (err) | |
378 | break; | |
379 | } | |
380 | svc_destroy(nfsd_serv); | |
eed2965a GB |
381 | |
382 | return err; | |
383 | } | |
384 | ||
1da177e4 LT |
385 | int |
386 | nfsd_svc(unsigned short port, int nrservs) | |
387 | { | |
388 | int error; | |
bedbdd8b NB |
389 | |
390 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 391 | dprintk("nfsd: creating service\n"); |
1da177e4 LT |
392 | if (nrservs <= 0) |
393 | nrservs = 0; | |
394 | if (nrservs > NFSD_MAXSERVS) | |
395 | nrservs = NFSD_MAXSERVS; | |
671e1fcf N |
396 | error = 0; |
397 | if (nrservs == 0 && nfsd_serv == NULL) | |
398 | goto out; | |
399 | ||
1da177e4 LT |
400 | /* Readahead param cache - will no-op if it already exists */ |
401 | error = nfsd_racache_init(2*nrservs); | |
402 | if (error<0) | |
403 | goto out; | |
e8ff2a84 | 404 | nfs4_state_start(); |
02a375f0 N |
405 | |
406 | nfsd_reset_versions(); | |
407 | ||
408 | error = nfsd_create_serv(); | |
409 | ||
410 | if (error) | |
411 | goto out; | |
412 | error = nfsd_init_socks(port); | |
413 | if (error) | |
414 | goto failure; | |
415 | ||
eec09661 | 416 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
82e12fe9 N |
417 | if (error == 0) |
418 | /* We are holding a reference to nfsd_serv which | |
419 | * we don't want to count in the return value, | |
420 | * so subtract 1 | |
421 | */ | |
422 | error = nfsd_serv->sv_nrthreads - 1; | |
1da177e4 | 423 | failure: |
1da177e4 | 424 | svc_destroy(nfsd_serv); /* Release server */ |
1da177e4 | 425 | out: |
bedbdd8b | 426 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
427 | return error; |
428 | } | |
429 | ||
1da177e4 LT |
430 | |
431 | /* | |
432 | * This is the NFS server kernel thread | |
433 | */ | |
9867d76c JL |
434 | static int |
435 | nfsd(void *vrqstp) | |
1da177e4 | 436 | { |
9867d76c | 437 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
9867d76c | 438 | int err, preverr = 0; |
1da177e4 LT |
439 | |
440 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 441 | mutex_lock(&nfsd_mutex); |
1da177e4 | 442 | |
9867d76c | 443 | /* At this point, the thread shares current->fs |
1da177e4 LT |
444 | * with the init process. We need to create files with a |
445 | * umask of 0 instead of init's umask. */ | |
3e93cd67 | 446 | if (unshare_fs_struct() < 0) { |
1da177e4 LT |
447 | printk("Unable to start nfsd thread: out of memory\n"); |
448 | goto out; | |
449 | } | |
3e93cd67 | 450 | |
1da177e4 LT |
451 | current->fs->umask = 0; |
452 | ||
9867d76c JL |
453 | /* |
454 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
100766f8 | 455 | * the ones that will bring down the thread |
9867d76c | 456 | */ |
100766f8 JL |
457 | allow_signal(SIGKILL); |
458 | allow_signal(SIGHUP); | |
459 | allow_signal(SIGINT); | |
460 | allow_signal(SIGQUIT); | |
bedbdd8b | 461 | |
1da177e4 | 462 | nfsdstats.th_cnt++; |
bedbdd8b NB |
463 | mutex_unlock(&nfsd_mutex); |
464 | ||
1da177e4 LT |
465 | /* |
466 | * We want less throttling in balance_dirty_pages() so that nfs to | |
467 | * localhost doesn't cause nfsd to lock up due to all the client's | |
468 | * dirty pages. | |
469 | */ | |
470 | current->flags |= PF_LESS_THROTTLE; | |
83144186 | 471 | set_freezable(); |
1da177e4 LT |
472 | |
473 | /* | |
474 | * The main request loop | |
475 | */ | |
476 | for (;;) { | |
1da177e4 LT |
477 | /* |
478 | * Find a socket with data available and call its | |
479 | * recvfrom routine. | |
480 | */ | |
6fb2b47f | 481 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 482 | ; |
9867d76c | 483 | if (err == -EINTR) |
1da177e4 | 484 | break; |
9867d76c JL |
485 | else if (err < 0) { |
486 | if (err != preverr) { | |
487 | printk(KERN_WARNING "%s: unexpected error " | |
488 | "from svc_recv (%d)\n", __func__, -err); | |
489 | preverr = err; | |
490 | } | |
491 | schedule_timeout_uninterruptible(HZ); | |
492 | continue; | |
493 | } | |
494 | ||
1da177e4 LT |
495 | |
496 | /* Lock the export hash tables for reading. */ | |
497 | exp_readlock(); | |
498 | ||
6fb2b47f | 499 | svc_process(rqstp); |
1da177e4 LT |
500 | |
501 | /* Unlock export hash tables */ | |
502 | exp_readunlock(); | |
1da177e4 LT |
503 | } |
504 | ||
24e36663 | 505 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 506 | flush_signals(current); |
1da177e4 | 507 | |
bedbdd8b | 508 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
509 | nfsdstats.th_cnt --; |
510 | ||
511 | out: | |
512 | /* Release the thread */ | |
513 | svc_exit_thread(rqstp); | |
514 | ||
515 | /* Release module */ | |
bedbdd8b | 516 | mutex_unlock(&nfsd_mutex); |
1da177e4 | 517 | module_put_and_exit(0); |
9867d76c | 518 | return 0; |
1da177e4 LT |
519 | } |
520 | ||
32c1eb0c AA |
521 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
522 | { | |
523 | if (nfserr == nfserr_jukebox && vers == 2) | |
524 | return nfserr_dropit; | |
525 | if (nfserr == nfserr_wrongsec && vers < 4) | |
526 | return nfserr_acces; | |
527 | return nfserr; | |
528 | } | |
529 | ||
1da177e4 | 530 | int |
c7afef1f | 531 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
532 | { |
533 | struct svc_procedure *proc; | |
534 | kxdrproc_t xdr; | |
ad451d38 AV |
535 | __be32 nfserr; |
536 | __be32 *nfserrp; | |
1da177e4 LT |
537 | |
538 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
539 | rqstp->rq_vers, rqstp->rq_proc); | |
540 | proc = rqstp->rq_procinfo; | |
541 | ||
542 | /* Check whether we have this call in the cache. */ | |
543 | switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) { | |
544 | case RC_INTR: | |
545 | case RC_DROPIT: | |
546 | return 0; | |
547 | case RC_REPLY: | |
548 | return 1; | |
549 | case RC_DOIT:; | |
550 | /* do it */ | |
551 | } | |
552 | ||
553 | /* Decode arguments */ | |
554 | xdr = proc->pc_decode; | |
ad451d38 | 555 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, |
1da177e4 LT |
556 | rqstp->rq_argp)) { |
557 | dprintk("nfsd: failed to decode arguments!\n"); | |
558 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
559 | *statp = rpc_garbage_args; | |
560 | return 1; | |
561 | } | |
562 | ||
563 | /* need to grab the location to store the status, as | |
564 | * nfsv4 does some encoding while processing | |
565 | */ | |
566 | nfserrp = rqstp->rq_res.head[0].iov_base | |
567 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 568 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 | 569 | |
074fe897 AA |
570 | /* NFSv4.1 DRC requires statp */ |
571 | if (rqstp->rq_vers == 4) | |
572 | nfsd4_set_statp(rqstp, statp); | |
573 | ||
1da177e4 LT |
574 | /* Now call the procedure handler, and encode NFS status. */ |
575 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 576 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
1da177e4 | 577 | if (nfserr == nfserr_dropit) { |
45457e09 | 578 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
579 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
580 | return 0; | |
581 | } | |
582 | ||
583 | if (rqstp->rq_proc != 0) | |
584 | *nfserrp++ = nfserr; | |
585 | ||
586 | /* Encode result. | |
587 | * For NFSv2, additional info is never returned in case of an error. | |
588 | */ | |
589 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
590 | xdr = proc->pc_encode; | |
591 | if (xdr && !xdr(rqstp, nfserrp, | |
592 | rqstp->rq_resp)) { | |
593 | /* Failed to encode result. Release cache entry */ | |
594 | dprintk("nfsd: failed to encode result!\n"); | |
595 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
596 | *statp = rpc_system_err; | |
597 | return 1; | |
598 | } | |
599 | } | |
600 | ||
601 | /* Store reply in cache. */ | |
602 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); | |
603 | return 1; | |
604 | } | |
03cf6c9f GB |
605 | |
606 | int nfsd_pool_stats_open(struct inode *inode, struct file *file) | |
607 | { | |
608 | if (nfsd_serv == NULL) | |
609 | return -ENODEV; | |
610 | return svc_pool_stats_open(nfsd_serv, file); | |
611 | } |