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> | |
83144186 | 22 | #include <linux/freezer.h> |
1da177e4 LT |
23 | #include <linux/fs_struct.h> |
24 | ||
25 | #include <linux/sunrpc/types.h> | |
26 | #include <linux/sunrpc/stats.h> | |
27 | #include <linux/sunrpc/svc.h> | |
28 | #include <linux/sunrpc/svcsock.h> | |
29 | #include <linux/sunrpc/cache.h> | |
30 | #include <linux/nfsd/nfsd.h> | |
31 | #include <linux/nfsd/stats.h> | |
32 | #include <linux/nfsd/cache.h> | |
70c3b76c | 33 | #include <linux/nfsd/syscall.h> |
1da177e4 | 34 | #include <linux/lockd/bind.h> |
a257cdd0 | 35 | #include <linux/nfsacl.h> |
1da177e4 LT |
36 | |
37 | #define NFSDDBG_FACILITY NFSDDBG_SVC | |
38 | ||
39 | /* these signals will be delivered to an nfsd thread | |
40 | * when handling a request | |
41 | */ | |
42 | #define ALLOWED_SIGS (sigmask(SIGKILL)) | |
43 | /* these signals will be delivered to an nfsd thread | |
44 | * when not handling a request. i.e. when waiting | |
45 | */ | |
46 | #define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT)) | |
47 | /* if the last thread dies with SIGHUP, then the exports table is | |
48 | * left unchanged ( like 2.4-{0-9} ). Any other signal will clear | |
49 | * the exports table (like 2.2). | |
50 | */ | |
51 | #define SIG_NOCLEAN SIGHUP | |
52 | ||
53 | extern struct svc_program nfsd_program; | |
54 | static void nfsd(struct svc_rqst *rqstp); | |
55 | struct timeval nfssvc_boot; | |
70c3b76c | 56 | struct svc_serv *nfsd_serv; |
1da177e4 LT |
57 | static atomic_t nfsd_busy; |
58 | static unsigned long nfsd_last_call; | |
59 | static DEFINE_SPINLOCK(nfsd_call_lock); | |
60 | ||
3fb803a9 AG |
61 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
62 | static struct svc_stat nfsd_acl_svcstats; | |
63 | static struct svc_version * nfsd_acl_version[] = { | |
64 | [2] = &nfsd_acl_version2, | |
65 | [3] = &nfsd_acl_version3, | |
66 | }; | |
67 | ||
68 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 69 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
70 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
71 | ||
72 | static struct svc_program nfsd_acl_program = { | |
73 | .pg_prog = NFS_ACL_PROGRAM, | |
74 | .pg_nvers = NFSD_ACL_NRVERS, | |
75 | .pg_vers = nfsd_acl_versions, | |
1a8eff6d | 76 | .pg_name = "nfsacl", |
3fb803a9 AG |
77 | .pg_class = "nfsd", |
78 | .pg_stats = &nfsd_acl_svcstats, | |
79 | .pg_authenticate = &svc_set_client, | |
80 | }; | |
81 | ||
82 | static struct svc_stat nfsd_acl_svcstats = { | |
83 | .program = &nfsd_acl_program, | |
84 | }; | |
85 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
86 | ||
70c3b76c N |
87 | static struct svc_version * nfsd_version[] = { |
88 | [2] = &nfsd_version2, | |
89 | #if defined(CONFIG_NFSD_V3) | |
90 | [3] = &nfsd_version3, | |
91 | #endif | |
92 | #if defined(CONFIG_NFSD_V4) | |
93 | [4] = &nfsd_version4, | |
94 | #endif | |
95 | }; | |
96 | ||
97 | #define NFSD_MINVERS 2 | |
e8c96f8c | 98 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
99 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
100 | ||
101 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
102 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
103 | .pg_next = &nfsd_acl_program, | |
104 | #endif | |
70c3b76c N |
105 | .pg_prog = NFS_PROGRAM, /* program number */ |
106 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
107 | .pg_vers = nfsd_versions, /* version table */ | |
108 | .pg_name = "nfsd", /* program name */ | |
109 | .pg_class = "nfsd", /* authentication class */ | |
110 | .pg_stats = &nfsd_svcstats, /* version table */ | |
111 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
112 | ||
113 | }; | |
114 | ||
6658d3a7 N |
115 | int nfsd_vers(int vers, enum vers_op change) |
116 | { | |
117 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
118 | return -1; | |
119 | switch(change) { | |
120 | case NFSD_SET: | |
121 | nfsd_versions[vers] = nfsd_version[vers]; | |
6658d3a7 N |
122 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
123 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 124 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
6658d3a7 | 125 | #endif |
1a8eff6d | 126 | break; |
6658d3a7 N |
127 | case NFSD_CLEAR: |
128 | nfsd_versions[vers] = NULL; | |
129 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
130 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 131 | nfsd_acl_versions[vers] = NULL; |
6658d3a7 N |
132 | #endif |
133 | break; | |
134 | case NFSD_TEST: | |
135 | return nfsd_versions[vers] != NULL; | |
136 | case NFSD_AVAIL: | |
137 | return nfsd_version[vers] != NULL; | |
138 | } | |
139 | return 0; | |
140 | } | |
1da177e4 LT |
141 | /* |
142 | * Maximum number of nfsd processes | |
143 | */ | |
144 | #define NFSD_MAXSERVS 8192 | |
145 | ||
146 | int nfsd_nrthreads(void) | |
147 | { | |
148 | if (nfsd_serv == NULL) | |
149 | return 0; | |
150 | else | |
151 | return nfsd_serv->sv_nrthreads; | |
152 | } | |
153 | ||
bc591ccf N |
154 | static int killsig; /* signal that was used to kill last nfsd */ |
155 | static void nfsd_last_thread(struct svc_serv *serv) | |
156 | { | |
157 | /* When last nfsd thread exits we need to do some clean-up */ | |
7a182083 TT |
158 | struct svc_xprt *xprt; |
159 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) | |
24e36663 | 160 | lockd_down(); |
bc591ccf N |
161 | nfsd_serv = NULL; |
162 | nfsd_racache_shutdown(); | |
163 | nfs4_state_shutdown(); | |
164 | ||
165 | printk(KERN_WARNING "nfsd: last server has exited\n"); | |
166 | if (killsig != SIG_NOCLEAN) { | |
167 | printk(KERN_WARNING "nfsd: unexporting all filesystems\n"); | |
168 | nfsd_export_flush(); | |
169 | } | |
170 | } | |
6658d3a7 N |
171 | |
172 | void nfsd_reset_versions(void) | |
173 | { | |
174 | int found_one = 0; | |
175 | int i; | |
176 | ||
177 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
178 | if (nfsd_program.pg_vers[i]) | |
179 | found_one = 1; | |
180 | } | |
181 | ||
182 | if (!found_one) { | |
183 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
184 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
185 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
186 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
187 | nfsd_acl_program.pg_vers[i] = | |
188 | nfsd_acl_version[i]; | |
189 | #endif | |
190 | } | |
191 | } | |
192 | ||
b41b66d6 | 193 | int nfsd_create_serv(void) |
02a375f0 N |
194 | { |
195 | int err = 0; | |
196 | lock_kernel(); | |
197 | if (nfsd_serv) { | |
9a24ab57 | 198 | svc_get(nfsd_serv); |
02a375f0 N |
199 | unlock_kernel(); |
200 | return 0; | |
201 | } | |
596bbe53 N |
202 | if (nfsd_max_blksize == 0) { |
203 | /* choose a suitable default */ | |
204 | struct sysinfo i; | |
205 | si_meminfo(&i); | |
206 | /* Aim for 1/4096 of memory per thread | |
207 | * This gives 1MB on 4Gig machines | |
208 | * But only uses 32K on 128M machines. | |
209 | * Bottom out at 8K on 32M and smaller. | |
210 | * Of course, this is only a default. | |
211 | */ | |
212 | nfsd_max_blksize = NFSSVC_MAXBLKSIZE; | |
44c55600 | 213 | i.totalram <<= PAGE_SHIFT - 12; |
596bbe53 N |
214 | while (nfsd_max_blksize > i.totalram && |
215 | nfsd_max_blksize >= 8*1024*2) | |
216 | nfsd_max_blksize /= 2; | |
217 | } | |
02a375f0 N |
218 | |
219 | atomic_set(&nfsd_busy, 0); | |
596bbe53 | 220 | nfsd_serv = svc_create_pooled(&nfsd_program, |
c6b0a9f8 | 221 | nfsd_max_blksize, |
eec09661 GB |
222 | nfsd_last_thread, |
223 | nfsd, SIG_NOCLEAN, THIS_MODULE); | |
02a375f0 N |
224 | if (nfsd_serv == NULL) |
225 | err = -ENOMEM; | |
02a375f0 N |
226 | unlock_kernel(); |
227 | do_gettimeofday(&nfssvc_boot); /* record boot time */ | |
228 | return err; | |
229 | } | |
230 | ||
231 | static int nfsd_init_socks(int port) | |
232 | { | |
233 | int error; | |
234 | if (!list_empty(&nfsd_serv->sv_permsocks)) | |
235 | return 0; | |
236 | ||
02a375f0 | 237 | error = lockd_up(IPPROTO_UDP); |
4a3ae42d | 238 | if (error >= 0) { |
d7c9f1ed | 239 | error = svc_create_xprt(nfsd_serv, "udp", port, |
482fb94e | 240 | SVC_SOCK_DEFAULTS); |
4a3ae42d N |
241 | if (error < 0) |
242 | lockd_down(); | |
243 | } | |
02a375f0 N |
244 | if (error < 0) |
245 | return error; | |
246 | ||
02a375f0 | 247 | error = lockd_up(IPPROTO_TCP); |
4a3ae42d | 248 | if (error >= 0) { |
d7c9f1ed | 249 | error = svc_create_xprt(nfsd_serv, "tcp", port, |
482fb94e | 250 | SVC_SOCK_DEFAULTS); |
4a3ae42d N |
251 | if (error < 0) |
252 | lockd_down(); | |
253 | } | |
02a375f0 N |
254 | if (error < 0) |
255 | return error; | |
02a375f0 N |
256 | return 0; |
257 | } | |
258 | ||
eed2965a GB |
259 | int nfsd_nrpools(void) |
260 | { | |
261 | if (nfsd_serv == NULL) | |
262 | return 0; | |
263 | else | |
264 | return nfsd_serv->sv_nrpools; | |
265 | } | |
266 | ||
267 | int nfsd_get_nrthreads(int n, int *nthreads) | |
268 | { | |
269 | int i = 0; | |
270 | ||
271 | if (nfsd_serv != NULL) { | |
272 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) | |
273 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; | |
274 | } | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | int nfsd_set_nrthreads(int n, int *nthreads) | |
280 | { | |
281 | int i = 0; | |
282 | int tot = 0; | |
283 | int err = 0; | |
284 | ||
285 | if (nfsd_serv == NULL || n <= 0) | |
286 | return 0; | |
287 | ||
288 | if (n > nfsd_serv->sv_nrpools) | |
289 | n = nfsd_serv->sv_nrpools; | |
290 | ||
291 | /* enforce a global maximum number of threads */ | |
292 | tot = 0; | |
293 | for (i = 0; i < n; i++) { | |
294 | if (nthreads[i] > NFSD_MAXSERVS) | |
295 | nthreads[i] = NFSD_MAXSERVS; | |
296 | tot += nthreads[i]; | |
297 | } | |
298 | if (tot > NFSD_MAXSERVS) { | |
299 | /* total too large: scale down requested numbers */ | |
300 | for (i = 0; i < n && tot > 0; i++) { | |
301 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
302 | tot -= (nthreads[i] - new); | |
303 | nthreads[i] = new; | |
304 | } | |
305 | for (i = 0; i < n && tot > 0; i++) { | |
306 | nthreads[i]--; | |
307 | tot--; | |
308 | } | |
309 | } | |
310 | ||
311 | /* | |
312 | * There must always be a thread in pool 0; the admin | |
313 | * can't shut down NFS completely using pool_threads. | |
314 | */ | |
315 | if (nthreads[0] == 0) | |
316 | nthreads[0] = 1; | |
317 | ||
318 | /* apply the new numbers */ | |
319 | lock_kernel(); | |
320 | svc_get(nfsd_serv); | |
321 | for (i = 0; i < n; i++) { | |
322 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], | |
323 | nthreads[i]); | |
324 | if (err) | |
325 | break; | |
326 | } | |
327 | svc_destroy(nfsd_serv); | |
328 | unlock_kernel(); | |
329 | ||
330 | return err; | |
331 | } | |
332 | ||
1da177e4 LT |
333 | int |
334 | nfsd_svc(unsigned short port, int nrservs) | |
335 | { | |
336 | int error; | |
1da177e4 LT |
337 | |
338 | lock_kernel(); | |
6658d3a7 | 339 | dprintk("nfsd: creating service\n"); |
1da177e4 LT |
340 | error = -EINVAL; |
341 | if (nrservs <= 0) | |
342 | nrservs = 0; | |
343 | if (nrservs > NFSD_MAXSERVS) | |
344 | nrservs = NFSD_MAXSERVS; | |
345 | ||
346 | /* Readahead param cache - will no-op if it already exists */ | |
347 | error = nfsd_racache_init(2*nrservs); | |
348 | if (error<0) | |
349 | goto out; | |
e8ff2a84 | 350 | nfs4_state_start(); |
02a375f0 N |
351 | |
352 | nfsd_reset_versions(); | |
353 | ||
354 | error = nfsd_create_serv(); | |
355 | ||
356 | if (error) | |
357 | goto out; | |
358 | error = nfsd_init_socks(port); | |
359 | if (error) | |
360 | goto failure; | |
361 | ||
eec09661 | 362 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
1da177e4 | 363 | failure: |
1da177e4 | 364 | svc_destroy(nfsd_serv); /* Release server */ |
1da177e4 LT |
365 | out: |
366 | unlock_kernel(); | |
367 | return error; | |
368 | } | |
369 | ||
370 | static inline void | |
371 | update_thread_usage(int busy_threads) | |
372 | { | |
373 | unsigned long prev_call; | |
374 | unsigned long diff; | |
375 | int decile; | |
376 | ||
377 | spin_lock(&nfsd_call_lock); | |
378 | prev_call = nfsd_last_call; | |
379 | nfsd_last_call = jiffies; | |
380 | decile = busy_threads*10/nfsdstats.th_cnt; | |
381 | if (decile>0 && decile <= 10) { | |
382 | diff = nfsd_last_call - prev_call; | |
383 | if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP) | |
384 | nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP; | |
385 | if (decile == 10) | |
386 | nfsdstats.th_fullcnt++; | |
387 | } | |
388 | spin_unlock(&nfsd_call_lock); | |
389 | } | |
390 | ||
391 | /* | |
392 | * This is the NFS server kernel thread | |
393 | */ | |
394 | static void | |
395 | nfsd(struct svc_rqst *rqstp) | |
396 | { | |
1da177e4 LT |
397 | struct fs_struct *fsp; |
398 | int err; | |
1da177e4 LT |
399 | sigset_t shutdown_mask, allowed_mask; |
400 | ||
401 | /* Lock module and set up kernel thread */ | |
402 | lock_kernel(); | |
403 | daemonize("nfsd"); | |
404 | ||
405 | /* After daemonize() this kernel thread shares current->fs | |
406 | * with the init process. We need to create files with a | |
407 | * umask of 0 instead of init's umask. */ | |
408 | fsp = copy_fs_struct(current->fs); | |
409 | if (!fsp) { | |
410 | printk("Unable to start nfsd thread: out of memory\n"); | |
411 | goto out; | |
412 | } | |
413 | exit_fs(current); | |
414 | current->fs = fsp; | |
415 | current->fs->umask = 0; | |
416 | ||
417 | siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS); | |
418 | siginitsetinv(&allowed_mask, ALLOWED_SIGS); | |
419 | ||
420 | nfsdstats.th_cnt++; | |
421 | ||
eec09661 | 422 | rqstp->rq_task = current; |
1da177e4 LT |
423 | |
424 | unlock_kernel(); | |
425 | ||
426 | /* | |
427 | * We want less throttling in balance_dirty_pages() so that nfs to | |
428 | * localhost doesn't cause nfsd to lock up due to all the client's | |
429 | * dirty pages. | |
430 | */ | |
431 | current->flags |= PF_LESS_THROTTLE; | |
83144186 | 432 | set_freezable(); |
1da177e4 LT |
433 | |
434 | /* | |
435 | * The main request loop | |
436 | */ | |
437 | for (;;) { | |
438 | /* Block all but the shutdown signals */ | |
439 | sigprocmask(SIG_SETMASK, &shutdown_mask, NULL); | |
440 | ||
441 | /* | |
442 | * Find a socket with data available and call its | |
443 | * recvfrom routine. | |
444 | */ | |
6fb2b47f | 445 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 LT |
446 | ; |
447 | if (err < 0) | |
448 | break; | |
449 | update_thread_usage(atomic_read(&nfsd_busy)); | |
450 | atomic_inc(&nfsd_busy); | |
451 | ||
452 | /* Lock the export hash tables for reading. */ | |
453 | exp_readlock(); | |
454 | ||
455 | /* Process request with signals blocked. */ | |
456 | sigprocmask(SIG_SETMASK, &allowed_mask, NULL); | |
457 | ||
6fb2b47f | 458 | svc_process(rqstp); |
1da177e4 LT |
459 | |
460 | /* Unlock export hash tables */ | |
461 | exp_readunlock(); | |
462 | update_thread_usage(atomic_read(&nfsd_busy)); | |
463 | atomic_dec(&nfsd_busy); | |
464 | } | |
465 | ||
466 | if (err != -EINTR) { | |
467 | printk(KERN_WARNING "nfsd: terminating on error %d\n", -err); | |
468 | } else { | |
469 | unsigned int signo; | |
470 | ||
471 | for (signo = 1; signo <= _NSIG; signo++) | |
472 | if (sigismember(¤t->pending.signal, signo) && | |
473 | !sigismember(¤t->blocked, signo)) | |
474 | break; | |
bc591ccf | 475 | killsig = signo; |
1da177e4 | 476 | } |
24e36663 | 477 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 478 | flush_signals(current); |
1da177e4 LT |
479 | |
480 | lock_kernel(); | |
481 | ||
1da177e4 LT |
482 | nfsdstats.th_cnt --; |
483 | ||
484 | out: | |
485 | /* Release the thread */ | |
486 | svc_exit_thread(rqstp); | |
487 | ||
488 | /* Release module */ | |
c4f92dba | 489 | unlock_kernel(); |
1da177e4 LT |
490 | module_put_and_exit(0); |
491 | } | |
492 | ||
32c1eb0c AA |
493 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
494 | { | |
495 | if (nfserr == nfserr_jukebox && vers == 2) | |
496 | return nfserr_dropit; | |
497 | if (nfserr == nfserr_wrongsec && vers < 4) | |
498 | return nfserr_acces; | |
499 | return nfserr; | |
500 | } | |
501 | ||
1da177e4 | 502 | int |
c7afef1f | 503 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
504 | { |
505 | struct svc_procedure *proc; | |
506 | kxdrproc_t xdr; | |
ad451d38 AV |
507 | __be32 nfserr; |
508 | __be32 *nfserrp; | |
1da177e4 LT |
509 | |
510 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
511 | rqstp->rq_vers, rqstp->rq_proc); | |
512 | proc = rqstp->rq_procinfo; | |
513 | ||
514 | /* Check whether we have this call in the cache. */ | |
515 | switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) { | |
516 | case RC_INTR: | |
517 | case RC_DROPIT: | |
518 | return 0; | |
519 | case RC_REPLY: | |
520 | return 1; | |
521 | case RC_DOIT:; | |
522 | /* do it */ | |
523 | } | |
524 | ||
525 | /* Decode arguments */ | |
526 | xdr = proc->pc_decode; | |
ad451d38 | 527 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, |
1da177e4 LT |
528 | rqstp->rq_argp)) { |
529 | dprintk("nfsd: failed to decode arguments!\n"); | |
530 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
531 | *statp = rpc_garbage_args; | |
532 | return 1; | |
533 | } | |
534 | ||
535 | /* need to grab the location to store the status, as | |
536 | * nfsv4 does some encoding while processing | |
537 | */ | |
538 | nfserrp = rqstp->rq_res.head[0].iov_base | |
539 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 540 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
541 | |
542 | /* Now call the procedure handler, and encode NFS status. */ | |
543 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 544 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
1da177e4 | 545 | if (nfserr == nfserr_dropit) { |
45457e09 | 546 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
547 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
548 | return 0; | |
549 | } | |
550 | ||
551 | if (rqstp->rq_proc != 0) | |
552 | *nfserrp++ = nfserr; | |
553 | ||
554 | /* Encode result. | |
555 | * For NFSv2, additional info is never returned in case of an error. | |
556 | */ | |
557 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
558 | xdr = proc->pc_encode; | |
559 | if (xdr && !xdr(rqstp, nfserrp, | |
560 | rqstp->rq_resp)) { | |
561 | /* Failed to encode result. Release cache entry */ | |
562 | dprintk("nfsd: failed to encode result!\n"); | |
563 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
564 | *statp = rpc_system_err; | |
565 | return 1; | |
566 | } | |
567 | } | |
568 | ||
569 | /* Store reply in cache. */ | |
570 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); | |
571 | return 1; | |
572 | } |