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Commit | Line | Data |
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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> | |
21 | #include <linux/smp_lock.h> | |
83144186 | 22 | #include <linux/freezer.h> |
1da177e4 | 23 | #include <linux/fs_struct.h> |
9867d76c | 24 | #include <linux/kthread.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 | ||
6658d3a7 N |
123 | int nfsd_vers(int vers, enum vers_op change) |
124 | { | |
125 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
126 | return -1; | |
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 | } | |
1da177e4 LT |
149 | /* |
150 | * Maximum number of nfsd processes | |
151 | */ | |
152 | #define NFSD_MAXSERVS 8192 | |
153 | ||
154 | int nfsd_nrthreads(void) | |
155 | { | |
c7d106c9 NB |
156 | int rv = 0; |
157 | mutex_lock(&nfsd_mutex); | |
158 | if (nfsd_serv) | |
159 | rv = nfsd_serv->sv_nrthreads; | |
160 | mutex_unlock(&nfsd_mutex); | |
161 | return rv; | |
1da177e4 LT |
162 | } |
163 | ||
bc591ccf N |
164 | static void nfsd_last_thread(struct svc_serv *serv) |
165 | { | |
166 | /* When last nfsd thread exits we need to do some clean-up */ | |
7a182083 TT |
167 | struct svc_xprt *xprt; |
168 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) | |
24e36663 | 169 | lockd_down(); |
bc591ccf N |
170 | nfsd_serv = NULL; |
171 | nfsd_racache_shutdown(); | |
172 | nfs4_state_shutdown(); | |
173 | ||
e096bbc6 JL |
174 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
175 | "cache\n"); | |
176 | nfsd_export_flush(); | |
bc591ccf | 177 | } |
6658d3a7 N |
178 | |
179 | void nfsd_reset_versions(void) | |
180 | { | |
181 | int found_one = 0; | |
182 | int i; | |
183 | ||
184 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
185 | if (nfsd_program.pg_vers[i]) | |
186 | found_one = 1; | |
187 | } | |
188 | ||
189 | if (!found_one) { | |
190 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
191 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
192 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
193 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
194 | nfsd_acl_program.pg_vers[i] = | |
195 | nfsd_acl_version[i]; | |
196 | #endif | |
197 | } | |
198 | } | |
199 | ||
bedbdd8b | 200 | |
b41b66d6 | 201 | int nfsd_create_serv(void) |
02a375f0 N |
202 | { |
203 | int err = 0; | |
bedbdd8b NB |
204 | |
205 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); | |
02a375f0 | 206 | if (nfsd_serv) { |
9a24ab57 | 207 | svc_get(nfsd_serv); |
02a375f0 N |
208 | return 0; |
209 | } | |
596bbe53 N |
210 | if (nfsd_max_blksize == 0) { |
211 | /* choose a suitable default */ | |
212 | struct sysinfo i; | |
213 | si_meminfo(&i); | |
214 | /* Aim for 1/4096 of memory per thread | |
215 | * This gives 1MB on 4Gig machines | |
216 | * But only uses 32K on 128M machines. | |
217 | * Bottom out at 8K on 32M and smaller. | |
218 | * Of course, this is only a default. | |
219 | */ | |
220 | nfsd_max_blksize = NFSSVC_MAXBLKSIZE; | |
44c55600 | 221 | i.totalram <<= PAGE_SHIFT - 12; |
596bbe53 N |
222 | while (nfsd_max_blksize > i.totalram && |
223 | nfsd_max_blksize >= 8*1024*2) | |
224 | nfsd_max_blksize /= 2; | |
225 | } | |
02a375f0 | 226 | |
e096bbc6 | 227 | nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
e851db5b | 228 | AF_INET, |
a75c5d01 | 229 | nfsd_last_thread, nfsd, THIS_MODULE); |
02a375f0 N |
230 | if (nfsd_serv == NULL) |
231 | err = -ENOMEM; | |
bedbdd8b | 232 | |
02a375f0 N |
233 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
234 | return err; | |
235 | } | |
236 | ||
237 | static int nfsd_init_socks(int port) | |
238 | { | |
239 | int error; | |
240 | if (!list_empty(&nfsd_serv->sv_permsocks)) | |
241 | return 0; | |
242 | ||
26a41409 | 243 | error = svc_create_xprt(nfsd_serv, "udp", port, |
482fb94e | 244 | SVC_SOCK_DEFAULTS); |
02a375f0 N |
245 | if (error < 0) |
246 | return error; | |
247 | ||
1cd9cd16 CL |
248 | error = lockd_up(); |
249 | if (error < 0) | |
250 | return error; | |
251 | ||
26a41409 | 252 | error = svc_create_xprt(nfsd_serv, "tcp", port, |
482fb94e | 253 | SVC_SOCK_DEFAULTS); |
02a375f0 N |
254 | if (error < 0) |
255 | return error; | |
26a41409 CL |
256 | |
257 | error = lockd_up(); | |
258 | if (error < 0) | |
259 | return error; | |
260 | ||
02a375f0 N |
261 | return 0; |
262 | } | |
263 | ||
eed2965a GB |
264 | int nfsd_nrpools(void) |
265 | { | |
266 | if (nfsd_serv == NULL) | |
267 | return 0; | |
268 | else | |
269 | return nfsd_serv->sv_nrpools; | |
270 | } | |
271 | ||
272 | int nfsd_get_nrthreads(int n, int *nthreads) | |
273 | { | |
274 | int i = 0; | |
275 | ||
276 | if (nfsd_serv != NULL) { | |
277 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) | |
278 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; | |
279 | } | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | int nfsd_set_nrthreads(int n, int *nthreads) | |
285 | { | |
286 | int i = 0; | |
287 | int tot = 0; | |
288 | int err = 0; | |
289 | ||
bedbdd8b NB |
290 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
291 | ||
eed2965a GB |
292 | if (nfsd_serv == NULL || n <= 0) |
293 | return 0; | |
294 | ||
295 | if (n > nfsd_serv->sv_nrpools) | |
296 | n = nfsd_serv->sv_nrpools; | |
297 | ||
298 | /* enforce a global maximum number of threads */ | |
299 | tot = 0; | |
300 | for (i = 0; i < n; i++) { | |
301 | if (nthreads[i] > NFSD_MAXSERVS) | |
302 | nthreads[i] = NFSD_MAXSERVS; | |
303 | tot += nthreads[i]; | |
304 | } | |
305 | if (tot > NFSD_MAXSERVS) { | |
306 | /* total too large: scale down requested numbers */ | |
307 | for (i = 0; i < n && tot > 0; i++) { | |
308 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
309 | tot -= (nthreads[i] - new); | |
310 | nthreads[i] = new; | |
311 | } | |
312 | for (i = 0; i < n && tot > 0; i++) { | |
313 | nthreads[i]--; | |
314 | tot--; | |
315 | } | |
316 | } | |
317 | ||
318 | /* | |
319 | * There must always be a thread in pool 0; the admin | |
320 | * can't shut down NFS completely using pool_threads. | |
321 | */ | |
322 | if (nthreads[0] == 0) | |
323 | nthreads[0] = 1; | |
324 | ||
325 | /* apply the new numbers */ | |
eed2965a GB |
326 | svc_get(nfsd_serv); |
327 | for (i = 0; i < n; i++) { | |
328 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], | |
329 | nthreads[i]); | |
330 | if (err) | |
331 | break; | |
332 | } | |
333 | svc_destroy(nfsd_serv); | |
eed2965a GB |
334 | |
335 | return err; | |
336 | } | |
337 | ||
1da177e4 LT |
338 | int |
339 | nfsd_svc(unsigned short port, int nrservs) | |
340 | { | |
341 | int error; | |
bedbdd8b NB |
342 | |
343 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 344 | dprintk("nfsd: creating service\n"); |
1da177e4 LT |
345 | error = -EINVAL; |
346 | if (nrservs <= 0) | |
347 | nrservs = 0; | |
348 | if (nrservs > NFSD_MAXSERVS) | |
349 | nrservs = NFSD_MAXSERVS; | |
350 | ||
351 | /* Readahead param cache - will no-op if it already exists */ | |
352 | error = nfsd_racache_init(2*nrservs); | |
353 | if (error<0) | |
354 | goto out; | |
e8ff2a84 | 355 | nfs4_state_start(); |
02a375f0 N |
356 | |
357 | nfsd_reset_versions(); | |
358 | ||
359 | error = nfsd_create_serv(); | |
360 | ||
361 | if (error) | |
362 | goto out; | |
363 | error = nfsd_init_socks(port); | |
364 | if (error) | |
365 | goto failure; | |
366 | ||
eec09661 | 367 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
1da177e4 | 368 | failure: |
1da177e4 | 369 | svc_destroy(nfsd_serv); /* Release server */ |
1da177e4 | 370 | out: |
bedbdd8b | 371 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
372 | return error; |
373 | } | |
374 | ||
1da177e4 LT |
375 | |
376 | /* | |
377 | * This is the NFS server kernel thread | |
378 | */ | |
9867d76c JL |
379 | static int |
380 | nfsd(void *vrqstp) | |
1da177e4 | 381 | { |
9867d76c | 382 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
1da177e4 | 383 | struct fs_struct *fsp; |
9867d76c | 384 | int err, preverr = 0; |
1da177e4 LT |
385 | |
386 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 387 | mutex_lock(&nfsd_mutex); |
1da177e4 | 388 | |
9867d76c | 389 | /* At this point, the thread shares current->fs |
1da177e4 LT |
390 | * with the init process. We need to create files with a |
391 | * umask of 0 instead of init's umask. */ | |
392 | fsp = copy_fs_struct(current->fs); | |
393 | if (!fsp) { | |
394 | printk("Unable to start nfsd thread: out of memory\n"); | |
395 | goto out; | |
396 | } | |
397 | exit_fs(current); | |
398 | current->fs = fsp; | |
399 | current->fs->umask = 0; | |
400 | ||
9867d76c JL |
401 | /* |
402 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
100766f8 | 403 | * the ones that will bring down the thread |
9867d76c | 404 | */ |
100766f8 JL |
405 | allow_signal(SIGKILL); |
406 | allow_signal(SIGHUP); | |
407 | allow_signal(SIGINT); | |
408 | allow_signal(SIGQUIT); | |
bedbdd8b | 409 | |
1da177e4 | 410 | nfsdstats.th_cnt++; |
bedbdd8b NB |
411 | mutex_unlock(&nfsd_mutex); |
412 | ||
1da177e4 LT |
413 | /* |
414 | * We want less throttling in balance_dirty_pages() so that nfs to | |
415 | * localhost doesn't cause nfsd to lock up due to all the client's | |
416 | * dirty pages. | |
417 | */ | |
418 | current->flags |= PF_LESS_THROTTLE; | |
83144186 | 419 | set_freezable(); |
1da177e4 LT |
420 | |
421 | /* | |
422 | * The main request loop | |
423 | */ | |
424 | for (;;) { | |
1da177e4 LT |
425 | /* |
426 | * Find a socket with data available and call its | |
427 | * recvfrom routine. | |
428 | */ | |
6fb2b47f | 429 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 430 | ; |
9867d76c | 431 | if (err == -EINTR) |
1da177e4 | 432 | break; |
9867d76c JL |
433 | else if (err < 0) { |
434 | if (err != preverr) { | |
435 | printk(KERN_WARNING "%s: unexpected error " | |
436 | "from svc_recv (%d)\n", __func__, -err); | |
437 | preverr = err; | |
438 | } | |
439 | schedule_timeout_uninterruptible(HZ); | |
440 | continue; | |
441 | } | |
442 | ||
1da177e4 LT |
443 | |
444 | /* Lock the export hash tables for reading. */ | |
445 | exp_readlock(); | |
446 | ||
6fb2b47f | 447 | svc_process(rqstp); |
1da177e4 LT |
448 | |
449 | /* Unlock export hash tables */ | |
450 | exp_readunlock(); | |
1da177e4 LT |
451 | } |
452 | ||
24e36663 | 453 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 454 | flush_signals(current); |
1da177e4 | 455 | |
bedbdd8b | 456 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
457 | nfsdstats.th_cnt --; |
458 | ||
459 | out: | |
460 | /* Release the thread */ | |
461 | svc_exit_thread(rqstp); | |
462 | ||
463 | /* Release module */ | |
bedbdd8b | 464 | mutex_unlock(&nfsd_mutex); |
1da177e4 | 465 | module_put_and_exit(0); |
9867d76c | 466 | return 0; |
1da177e4 LT |
467 | } |
468 | ||
32c1eb0c AA |
469 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
470 | { | |
471 | if (nfserr == nfserr_jukebox && vers == 2) | |
472 | return nfserr_dropit; | |
473 | if (nfserr == nfserr_wrongsec && vers < 4) | |
474 | return nfserr_acces; | |
475 | return nfserr; | |
476 | } | |
477 | ||
1da177e4 | 478 | int |
c7afef1f | 479 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
480 | { |
481 | struct svc_procedure *proc; | |
482 | kxdrproc_t xdr; | |
ad451d38 AV |
483 | __be32 nfserr; |
484 | __be32 *nfserrp; | |
1da177e4 LT |
485 | |
486 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
487 | rqstp->rq_vers, rqstp->rq_proc); | |
488 | proc = rqstp->rq_procinfo; | |
489 | ||
490 | /* Check whether we have this call in the cache. */ | |
491 | switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) { | |
492 | case RC_INTR: | |
493 | case RC_DROPIT: | |
494 | return 0; | |
495 | case RC_REPLY: | |
496 | return 1; | |
497 | case RC_DOIT:; | |
498 | /* do it */ | |
499 | } | |
500 | ||
501 | /* Decode arguments */ | |
502 | xdr = proc->pc_decode; | |
ad451d38 | 503 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, |
1da177e4 LT |
504 | rqstp->rq_argp)) { |
505 | dprintk("nfsd: failed to decode arguments!\n"); | |
506 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
507 | *statp = rpc_garbage_args; | |
508 | return 1; | |
509 | } | |
510 | ||
511 | /* need to grab the location to store the status, as | |
512 | * nfsv4 does some encoding while processing | |
513 | */ | |
514 | nfserrp = rqstp->rq_res.head[0].iov_base | |
515 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 516 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
517 | |
518 | /* Now call the procedure handler, and encode NFS status. */ | |
519 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 520 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
1da177e4 | 521 | if (nfserr == nfserr_dropit) { |
45457e09 | 522 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
523 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
524 | return 0; | |
525 | } | |
526 | ||
527 | if (rqstp->rq_proc != 0) | |
528 | *nfserrp++ = nfserr; | |
529 | ||
530 | /* Encode result. | |
531 | * For NFSv2, additional info is never returned in case of an error. | |
532 | */ | |
533 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
534 | xdr = proc->pc_encode; | |
535 | if (xdr && !xdr(rqstp, nfserrp, | |
536 | rqstp->rq_resp)) { | |
537 | /* Failed to encode result. Release cache entry */ | |
538 | dprintk("nfsd: failed to encode result!\n"); | |
539 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
540 | *statp = rpc_system_err; | |
541 | return 1; | |
542 | } | |
543 | } | |
544 | ||
545 | /* Store reply in cache. */ | |
546 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); | |
547 | return 1; | |
548 | } |