]>
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> | |
21 | #include <linux/smp_lock.h> | |
22 | #include <linux/fs_struct.h> | |
23 | ||
24 | #include <linux/sunrpc/types.h> | |
25 | #include <linux/sunrpc/stats.h> | |
26 | #include <linux/sunrpc/svc.h> | |
27 | #include <linux/sunrpc/svcsock.h> | |
28 | #include <linux/sunrpc/cache.h> | |
29 | #include <linux/nfsd/nfsd.h> | |
30 | #include <linux/nfsd/stats.h> | |
31 | #include <linux/nfsd/cache.h> | |
70c3b76c | 32 | #include <linux/nfsd/syscall.h> |
1da177e4 | 33 | #include <linux/lockd/bind.h> |
a257cdd0 | 34 | #include <linux/nfsacl.h> |
1da177e4 LT |
35 | |
36 | #define NFSDDBG_FACILITY NFSDDBG_SVC | |
37 | ||
38 | /* these signals will be delivered to an nfsd thread | |
39 | * when handling a request | |
40 | */ | |
41 | #define ALLOWED_SIGS (sigmask(SIGKILL)) | |
42 | /* these signals will be delivered to an nfsd thread | |
43 | * when not handling a request. i.e. when waiting | |
44 | */ | |
45 | #define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT)) | |
46 | /* if the last thread dies with SIGHUP, then the exports table is | |
47 | * left unchanged ( like 2.4-{0-9} ). Any other signal will clear | |
48 | * the exports table (like 2.2). | |
49 | */ | |
50 | #define SIG_NOCLEAN SIGHUP | |
51 | ||
52 | extern struct svc_program nfsd_program; | |
53 | static void nfsd(struct svc_rqst *rqstp); | |
54 | struct timeval nfssvc_boot; | |
70c3b76c | 55 | struct svc_serv *nfsd_serv; |
1da177e4 LT |
56 | static atomic_t nfsd_busy; |
57 | static unsigned long nfsd_last_call; | |
58 | static DEFINE_SPINLOCK(nfsd_call_lock); | |
59 | ||
3fb803a9 AG |
60 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
61 | static struct svc_stat nfsd_acl_svcstats; | |
62 | static struct svc_version * nfsd_acl_version[] = { | |
63 | [2] = &nfsd_acl_version2, | |
64 | [3] = &nfsd_acl_version3, | |
65 | }; | |
66 | ||
67 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 68 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
69 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
70 | ||
71 | static struct svc_program nfsd_acl_program = { | |
72 | .pg_prog = NFS_ACL_PROGRAM, | |
73 | .pg_nvers = NFSD_ACL_NRVERS, | |
74 | .pg_vers = nfsd_acl_versions, | |
1a8eff6d | 75 | .pg_name = "nfsacl", |
3fb803a9 AG |
76 | .pg_class = "nfsd", |
77 | .pg_stats = &nfsd_acl_svcstats, | |
78 | .pg_authenticate = &svc_set_client, | |
79 | }; | |
80 | ||
81 | static struct svc_stat nfsd_acl_svcstats = { | |
82 | .program = &nfsd_acl_program, | |
83 | }; | |
84 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
85 | ||
70c3b76c N |
86 | static struct svc_version * nfsd_version[] = { |
87 | [2] = &nfsd_version2, | |
88 | #if defined(CONFIG_NFSD_V3) | |
89 | [3] = &nfsd_version3, | |
90 | #endif | |
91 | #if defined(CONFIG_NFSD_V4) | |
92 | [4] = &nfsd_version4, | |
93 | #endif | |
94 | }; | |
95 | ||
96 | #define NFSD_MINVERS 2 | |
e8c96f8c | 97 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
98 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
99 | ||
100 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
101 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
102 | .pg_next = &nfsd_acl_program, | |
103 | #endif | |
70c3b76c N |
104 | .pg_prog = NFS_PROGRAM, /* program number */ |
105 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
106 | .pg_vers = nfsd_versions, /* version table */ | |
107 | .pg_name = "nfsd", /* program name */ | |
108 | .pg_class = "nfsd", /* authentication class */ | |
109 | .pg_stats = &nfsd_svcstats, /* version table */ | |
110 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
111 | ||
112 | }; | |
113 | ||
6658d3a7 N |
114 | int nfsd_vers(int vers, enum vers_op change) |
115 | { | |
116 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
117 | return -1; | |
118 | switch(change) { | |
119 | case NFSD_SET: | |
120 | nfsd_versions[vers] = nfsd_version[vers]; | |
6658d3a7 N |
121 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
122 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 123 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
6658d3a7 | 124 | #endif |
1a8eff6d | 125 | break; |
6658d3a7 N |
126 | case NFSD_CLEAR: |
127 | nfsd_versions[vers] = NULL; | |
128 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
129 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 130 | nfsd_acl_versions[vers] = NULL; |
6658d3a7 N |
131 | #endif |
132 | break; | |
133 | case NFSD_TEST: | |
134 | return nfsd_versions[vers] != NULL; | |
135 | case NFSD_AVAIL: | |
136 | return nfsd_version[vers] != NULL; | |
137 | } | |
138 | return 0; | |
139 | } | |
1da177e4 LT |
140 | /* |
141 | * Maximum number of nfsd processes | |
142 | */ | |
143 | #define NFSD_MAXSERVS 8192 | |
144 | ||
145 | int nfsd_nrthreads(void) | |
146 | { | |
147 | if (nfsd_serv == NULL) | |
148 | return 0; | |
149 | else | |
150 | return nfsd_serv->sv_nrthreads; | |
151 | } | |
152 | ||
bc591ccf N |
153 | static int killsig; /* signal that was used to kill last nfsd */ |
154 | static void nfsd_last_thread(struct svc_serv *serv) | |
155 | { | |
156 | /* When last nfsd thread exits we need to do some clean-up */ | |
24e36663 N |
157 | struct svc_sock *svsk; |
158 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_list) | |
159 | lockd_down(); | |
bc591ccf N |
160 | nfsd_serv = NULL; |
161 | nfsd_racache_shutdown(); | |
162 | nfs4_state_shutdown(); | |
163 | ||
164 | printk(KERN_WARNING "nfsd: last server has exited\n"); | |
165 | if (killsig != SIG_NOCLEAN) { | |
166 | printk(KERN_WARNING "nfsd: unexporting all filesystems\n"); | |
167 | nfsd_export_flush(); | |
168 | } | |
169 | } | |
6658d3a7 N |
170 | |
171 | void nfsd_reset_versions(void) | |
172 | { | |
173 | int found_one = 0; | |
174 | int i; | |
175 | ||
176 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
177 | if (nfsd_program.pg_vers[i]) | |
178 | found_one = 1; | |
179 | } | |
180 | ||
181 | if (!found_one) { | |
182 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
183 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
184 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
185 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
186 | nfsd_acl_program.pg_vers[i] = | |
187 | nfsd_acl_version[i]; | |
188 | #endif | |
189 | } | |
190 | } | |
191 | ||
b41b66d6 | 192 | int nfsd_create_serv(void) |
02a375f0 N |
193 | { |
194 | int err = 0; | |
195 | lock_kernel(); | |
196 | if (nfsd_serv) { | |
9a24ab57 | 197 | svc_get(nfsd_serv); |
02a375f0 N |
198 | unlock_kernel(); |
199 | return 0; | |
200 | } | |
596bbe53 N |
201 | if (nfsd_max_blksize == 0) { |
202 | /* choose a suitable default */ | |
203 | struct sysinfo i; | |
204 | si_meminfo(&i); | |
205 | /* Aim for 1/4096 of memory per thread | |
206 | * This gives 1MB on 4Gig machines | |
207 | * But only uses 32K on 128M machines. | |
208 | * Bottom out at 8K on 32M and smaller. | |
209 | * Of course, this is only a default. | |
210 | */ | |
211 | nfsd_max_blksize = NFSSVC_MAXBLKSIZE; | |
44c55600 | 212 | i.totalram <<= PAGE_SHIFT - 12; |
596bbe53 N |
213 | while (nfsd_max_blksize > i.totalram && |
214 | nfsd_max_blksize >= 8*1024*2) | |
215 | nfsd_max_blksize /= 2; | |
216 | } | |
02a375f0 N |
217 | |
218 | atomic_set(&nfsd_busy, 0); | |
596bbe53 | 219 | nfsd_serv = svc_create_pooled(&nfsd_program, |
c6b0a9f8 | 220 | nfsd_max_blksize, |
eec09661 GB |
221 | nfsd_last_thread, |
222 | nfsd, SIG_NOCLEAN, THIS_MODULE); | |
02a375f0 N |
223 | if (nfsd_serv == NULL) |
224 | err = -ENOMEM; | |
02a375f0 N |
225 | unlock_kernel(); |
226 | do_gettimeofday(&nfssvc_boot); /* record boot time */ | |
227 | return err; | |
228 | } | |
229 | ||
230 | static int nfsd_init_socks(int port) | |
231 | { | |
232 | int error; | |
233 | if (!list_empty(&nfsd_serv->sv_permsocks)) | |
234 | return 0; | |
235 | ||
02a375f0 | 236 | error = lockd_up(IPPROTO_UDP); |
4a3ae42d | 237 | if (error >= 0) { |
482fb94e CL |
238 | error = svc_makesock(nfsd_serv, IPPROTO_UDP, port, |
239 | SVC_SOCK_DEFAULTS); | |
4a3ae42d N |
240 | if (error < 0) |
241 | lockd_down(); | |
242 | } | |
02a375f0 N |
243 | if (error < 0) |
244 | return error; | |
245 | ||
246 | #ifdef CONFIG_NFSD_TCP | |
02a375f0 | 247 | error = lockd_up(IPPROTO_TCP); |
4a3ae42d | 248 | if (error >= 0) { |
482fb94e CL |
249 | error = svc_makesock(nfsd_serv, IPPROTO_TCP, port, |
250 | SVC_SOCK_DEFAULTS); | |
4a3ae42d N |
251 | if (error < 0) |
252 | lockd_down(); | |
253 | } | |
02a375f0 N |
254 | if (error < 0) |
255 | return error; | |
256 | #endif | |
257 | return 0; | |
258 | } | |
259 | ||
eed2965a GB |
260 | int nfsd_nrpools(void) |
261 | { | |
262 | if (nfsd_serv == NULL) | |
263 | return 0; | |
264 | else | |
265 | return nfsd_serv->sv_nrpools; | |
266 | } | |
267 | ||
268 | int nfsd_get_nrthreads(int n, int *nthreads) | |
269 | { | |
270 | int i = 0; | |
271 | ||
272 | if (nfsd_serv != NULL) { | |
273 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) | |
274 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; | |
275 | } | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | int nfsd_set_nrthreads(int n, int *nthreads) | |
281 | { | |
282 | int i = 0; | |
283 | int tot = 0; | |
284 | int err = 0; | |
285 | ||
286 | if (nfsd_serv == NULL || n <= 0) | |
287 | return 0; | |
288 | ||
289 | if (n > nfsd_serv->sv_nrpools) | |
290 | n = nfsd_serv->sv_nrpools; | |
291 | ||
292 | /* enforce a global maximum number of threads */ | |
293 | tot = 0; | |
294 | for (i = 0; i < n; i++) { | |
295 | if (nthreads[i] > NFSD_MAXSERVS) | |
296 | nthreads[i] = NFSD_MAXSERVS; | |
297 | tot += nthreads[i]; | |
298 | } | |
299 | if (tot > NFSD_MAXSERVS) { | |
300 | /* total too large: scale down requested numbers */ | |
301 | for (i = 0; i < n && tot > 0; i++) { | |
302 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
303 | tot -= (nthreads[i] - new); | |
304 | nthreads[i] = new; | |
305 | } | |
306 | for (i = 0; i < n && tot > 0; i++) { | |
307 | nthreads[i]--; | |
308 | tot--; | |
309 | } | |
310 | } | |
311 | ||
312 | /* | |
313 | * There must always be a thread in pool 0; the admin | |
314 | * can't shut down NFS completely using pool_threads. | |
315 | */ | |
316 | if (nthreads[0] == 0) | |
317 | nthreads[0] = 1; | |
318 | ||
319 | /* apply the new numbers */ | |
320 | lock_kernel(); | |
321 | svc_get(nfsd_serv); | |
322 | for (i = 0; i < n; i++) { | |
323 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], | |
324 | nthreads[i]); | |
325 | if (err) | |
326 | break; | |
327 | } | |
328 | svc_destroy(nfsd_serv); | |
329 | unlock_kernel(); | |
330 | ||
331 | return err; | |
332 | } | |
333 | ||
1da177e4 LT |
334 | int |
335 | nfsd_svc(unsigned short port, int nrservs) | |
336 | { | |
337 | int error; | |
1da177e4 LT |
338 | |
339 | lock_kernel(); | |
6658d3a7 | 340 | dprintk("nfsd: creating service\n"); |
1da177e4 LT |
341 | error = -EINVAL; |
342 | if (nrservs <= 0) | |
343 | nrservs = 0; | |
344 | if (nrservs > NFSD_MAXSERVS) | |
345 | nrservs = NFSD_MAXSERVS; | |
346 | ||
347 | /* Readahead param cache - will no-op if it already exists */ | |
348 | error = nfsd_racache_init(2*nrservs); | |
349 | if (error<0) | |
350 | goto out; | |
76a3550e | 351 | error = nfs4_state_start(); |
1da177e4 LT |
352 | if (error<0) |
353 | goto out; | |
02a375f0 N |
354 | |
355 | nfsd_reset_versions(); | |
356 | ||
357 | error = nfsd_create_serv(); | |
358 | ||
359 | if (error) | |
360 | goto out; | |
361 | error = nfsd_init_socks(port); | |
362 | if (error) | |
363 | goto failure; | |
364 | ||
eec09661 | 365 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
1da177e4 | 366 | failure: |
1da177e4 | 367 | svc_destroy(nfsd_serv); /* Release server */ |
1da177e4 LT |
368 | out: |
369 | unlock_kernel(); | |
370 | return error; | |
371 | } | |
372 | ||
373 | static inline void | |
374 | update_thread_usage(int busy_threads) | |
375 | { | |
376 | unsigned long prev_call; | |
377 | unsigned long diff; | |
378 | int decile; | |
379 | ||
380 | spin_lock(&nfsd_call_lock); | |
381 | prev_call = nfsd_last_call; | |
382 | nfsd_last_call = jiffies; | |
383 | decile = busy_threads*10/nfsdstats.th_cnt; | |
384 | if (decile>0 && decile <= 10) { | |
385 | diff = nfsd_last_call - prev_call; | |
386 | if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP) | |
387 | nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP; | |
388 | if (decile == 10) | |
389 | nfsdstats.th_fullcnt++; | |
390 | } | |
391 | spin_unlock(&nfsd_call_lock); | |
392 | } | |
393 | ||
394 | /* | |
395 | * This is the NFS server kernel thread | |
396 | */ | |
397 | static void | |
398 | nfsd(struct svc_rqst *rqstp) | |
399 | { | |
1da177e4 LT |
400 | struct fs_struct *fsp; |
401 | int err; | |
1da177e4 LT |
402 | sigset_t shutdown_mask, allowed_mask; |
403 | ||
404 | /* Lock module and set up kernel thread */ | |
405 | lock_kernel(); | |
406 | daemonize("nfsd"); | |
407 | ||
408 | /* After daemonize() this kernel thread shares current->fs | |
409 | * with the init process. We need to create files with a | |
410 | * umask of 0 instead of init's umask. */ | |
411 | fsp = copy_fs_struct(current->fs); | |
412 | if (!fsp) { | |
413 | printk("Unable to start nfsd thread: out of memory\n"); | |
414 | goto out; | |
415 | } | |
416 | exit_fs(current); | |
417 | current->fs = fsp; | |
418 | current->fs->umask = 0; | |
419 | ||
420 | siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS); | |
421 | siginitsetinv(&allowed_mask, ALLOWED_SIGS); | |
422 | ||
423 | nfsdstats.th_cnt++; | |
424 | ||
eec09661 | 425 | rqstp->rq_task = current; |
1da177e4 LT |
426 | |
427 | unlock_kernel(); | |
428 | ||
429 | /* | |
430 | * We want less throttling in balance_dirty_pages() so that nfs to | |
431 | * localhost doesn't cause nfsd to lock up due to all the client's | |
432 | * dirty pages. | |
433 | */ | |
434 | current->flags |= PF_LESS_THROTTLE; | |
435 | ||
436 | /* | |
437 | * The main request loop | |
438 | */ | |
439 | for (;;) { | |
440 | /* Block all but the shutdown signals */ | |
441 | sigprocmask(SIG_SETMASK, &shutdown_mask, NULL); | |
442 | ||
443 | /* | |
444 | * Find a socket with data available and call its | |
445 | * recvfrom routine. | |
446 | */ | |
6fb2b47f | 447 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 LT |
448 | ; |
449 | if (err < 0) | |
450 | break; | |
451 | update_thread_usage(atomic_read(&nfsd_busy)); | |
452 | atomic_inc(&nfsd_busy); | |
453 | ||
454 | /* Lock the export hash tables for reading. */ | |
455 | exp_readlock(); | |
456 | ||
457 | /* Process request with signals blocked. */ | |
458 | sigprocmask(SIG_SETMASK, &allowed_mask, NULL); | |
459 | ||
6fb2b47f | 460 | svc_process(rqstp); |
1da177e4 LT |
461 | |
462 | /* Unlock export hash tables */ | |
463 | exp_readunlock(); | |
464 | update_thread_usage(atomic_read(&nfsd_busy)); | |
465 | atomic_dec(&nfsd_busy); | |
466 | } | |
467 | ||
468 | if (err != -EINTR) { | |
469 | printk(KERN_WARNING "nfsd: terminating on error %d\n", -err); | |
470 | } else { | |
471 | unsigned int signo; | |
472 | ||
473 | for (signo = 1; signo <= _NSIG; signo++) | |
474 | if (sigismember(¤t->pending.signal, signo) && | |
475 | !sigismember(¤t->blocked, signo)) | |
476 | break; | |
bc591ccf | 477 | killsig = signo; |
1da177e4 | 478 | } |
24e36663 | 479 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 480 | flush_signals(current); |
1da177e4 LT |
481 | |
482 | lock_kernel(); | |
483 | ||
1da177e4 LT |
484 | nfsdstats.th_cnt --; |
485 | ||
486 | out: | |
487 | /* Release the thread */ | |
488 | svc_exit_thread(rqstp); | |
489 | ||
490 | /* Release module */ | |
c4f92dba | 491 | unlock_kernel(); |
1da177e4 LT |
492 | module_put_and_exit(0); |
493 | } | |
494 | ||
495 | int | |
c7afef1f | 496 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
497 | { |
498 | struct svc_procedure *proc; | |
499 | kxdrproc_t xdr; | |
ad451d38 AV |
500 | __be32 nfserr; |
501 | __be32 *nfserrp; | |
1da177e4 LT |
502 | |
503 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
504 | rqstp->rq_vers, rqstp->rq_proc); | |
505 | proc = rqstp->rq_procinfo; | |
506 | ||
507 | /* Check whether we have this call in the cache. */ | |
508 | switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) { | |
509 | case RC_INTR: | |
510 | case RC_DROPIT: | |
511 | return 0; | |
512 | case RC_REPLY: | |
513 | return 1; | |
514 | case RC_DOIT:; | |
515 | /* do it */ | |
516 | } | |
517 | ||
518 | /* Decode arguments */ | |
519 | xdr = proc->pc_decode; | |
ad451d38 | 520 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, |
1da177e4 LT |
521 | rqstp->rq_argp)) { |
522 | dprintk("nfsd: failed to decode arguments!\n"); | |
523 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
524 | *statp = rpc_garbage_args; | |
525 | return 1; | |
526 | } | |
527 | ||
528 | /* need to grab the location to store the status, as | |
529 | * nfsv4 does some encoding while processing | |
530 | */ | |
531 | nfserrp = rqstp->rq_res.head[0].iov_base | |
532 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 533 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
534 | |
535 | /* Now call the procedure handler, and encode NFS status. */ | |
536 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
537 | if (nfserr == nfserr_jukebox && rqstp->rq_vers == 2) | |
538 | nfserr = nfserr_dropit; | |
539 | if (nfserr == nfserr_dropit) { | |
540 | dprintk("nfsd: Dropping request due to malloc failure!\n"); | |
541 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
542 | return 0; | |
543 | } | |
544 | ||
545 | if (rqstp->rq_proc != 0) | |
546 | *nfserrp++ = nfserr; | |
547 | ||
548 | /* Encode result. | |
549 | * For NFSv2, additional info is never returned in case of an error. | |
550 | */ | |
551 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
552 | xdr = proc->pc_encode; | |
553 | if (xdr && !xdr(rqstp, nfserrp, | |
554 | rqstp->rq_resp)) { | |
555 | /* Failed to encode result. Release cache entry */ | |
556 | dprintk("nfsd: failed to encode result!\n"); | |
557 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
558 | *statp = rpc_system_err; | |
559 | return 1; | |
560 | } | |
561 | } | |
562 | ||
563 | /* Store reply in cache. */ | |
564 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); | |
565 | return 1; | |
566 | } |