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 | 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 LT |
43 | static atomic_t nfsd_busy; |
44 | static unsigned long nfsd_last_call; | |
45 | static DEFINE_SPINLOCK(nfsd_call_lock); | |
46 | ||
bedbdd8b NB |
47 | /* |
48 | * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members | |
49 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some | |
50 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt | |
51 | * | |
52 | * If (out side the lock) nfsd_serv is non-NULL, then it must point to a | |
53 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number | |
54 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each | |
55 | * entry of ->sv_pools[]. | |
56 | * | |
57 | * Transitions of the thread count between zero and non-zero are of particular | |
58 | * interest since the svc_serv needs to be created and initialized at that | |
59 | * point, or freed. | |
3dd98a3b JL |
60 | * |
61 | * Finally, the nfsd_mutex also protects some of the global variables that are | |
62 | * accessed when nfsd starts and that are settable via the write_* routines in | |
63 | * nfsctl.c. In particular: | |
64 | * | |
65 | * user_recovery_dirname | |
66 | * user_lease_time | |
67 | * nfsd_versions | |
bedbdd8b NB |
68 | */ |
69 | DEFINE_MUTEX(nfsd_mutex); | |
70 | struct svc_serv *nfsd_serv; | |
71 | ||
3fb803a9 AG |
72 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
73 | static struct svc_stat nfsd_acl_svcstats; | |
74 | static struct svc_version * nfsd_acl_version[] = { | |
75 | [2] = &nfsd_acl_version2, | |
76 | [3] = &nfsd_acl_version3, | |
77 | }; | |
78 | ||
79 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 80 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
81 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
82 | ||
83 | static struct svc_program nfsd_acl_program = { | |
84 | .pg_prog = NFS_ACL_PROGRAM, | |
85 | .pg_nvers = NFSD_ACL_NRVERS, | |
86 | .pg_vers = nfsd_acl_versions, | |
1a8eff6d | 87 | .pg_name = "nfsacl", |
3fb803a9 AG |
88 | .pg_class = "nfsd", |
89 | .pg_stats = &nfsd_acl_svcstats, | |
90 | .pg_authenticate = &svc_set_client, | |
91 | }; | |
92 | ||
93 | static struct svc_stat nfsd_acl_svcstats = { | |
94 | .program = &nfsd_acl_program, | |
95 | }; | |
96 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
97 | ||
70c3b76c N |
98 | static struct svc_version * nfsd_version[] = { |
99 | [2] = &nfsd_version2, | |
100 | #if defined(CONFIG_NFSD_V3) | |
101 | [3] = &nfsd_version3, | |
102 | #endif | |
103 | #if defined(CONFIG_NFSD_V4) | |
104 | [4] = &nfsd_version4, | |
105 | #endif | |
106 | }; | |
107 | ||
108 | #define NFSD_MINVERS 2 | |
e8c96f8c | 109 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
110 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
111 | ||
112 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
113 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
114 | .pg_next = &nfsd_acl_program, | |
115 | #endif | |
70c3b76c N |
116 | .pg_prog = NFS_PROGRAM, /* program number */ |
117 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
118 | .pg_vers = nfsd_versions, /* version table */ | |
119 | .pg_name = "nfsd", /* program name */ | |
120 | .pg_class = "nfsd", /* authentication class */ | |
121 | .pg_stats = &nfsd_svcstats, /* version table */ | |
122 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
123 | ||
124 | }; | |
125 | ||
6658d3a7 N |
126 | int nfsd_vers(int vers, enum vers_op change) |
127 | { | |
128 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
129 | return -1; | |
130 | switch(change) { | |
131 | case NFSD_SET: | |
132 | nfsd_versions[vers] = nfsd_version[vers]; | |
6658d3a7 N |
133 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
134 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 135 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
6658d3a7 | 136 | #endif |
1a8eff6d | 137 | break; |
6658d3a7 N |
138 | case NFSD_CLEAR: |
139 | nfsd_versions[vers] = NULL; | |
140 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
141 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 142 | nfsd_acl_versions[vers] = NULL; |
6658d3a7 N |
143 | #endif |
144 | break; | |
145 | case NFSD_TEST: | |
146 | return nfsd_versions[vers] != NULL; | |
147 | case NFSD_AVAIL: | |
148 | return nfsd_version[vers] != NULL; | |
149 | } | |
150 | return 0; | |
151 | } | |
1da177e4 LT |
152 | /* |
153 | * Maximum number of nfsd processes | |
154 | */ | |
155 | #define NFSD_MAXSERVS 8192 | |
156 | ||
157 | int nfsd_nrthreads(void) | |
158 | { | |
c7d106c9 NB |
159 | int rv = 0; |
160 | mutex_lock(&nfsd_mutex); | |
161 | if (nfsd_serv) | |
162 | rv = nfsd_serv->sv_nrthreads; | |
163 | mutex_unlock(&nfsd_mutex); | |
164 | return rv; | |
1da177e4 LT |
165 | } |
166 | ||
bc591ccf N |
167 | static void nfsd_last_thread(struct svc_serv *serv) |
168 | { | |
169 | /* When last nfsd thread exits we need to do some clean-up */ | |
7a182083 TT |
170 | struct svc_xprt *xprt; |
171 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) | |
24e36663 | 172 | lockd_down(); |
bc591ccf N |
173 | nfsd_serv = NULL; |
174 | nfsd_racache_shutdown(); | |
175 | nfs4_state_shutdown(); | |
176 | ||
e096bbc6 JL |
177 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
178 | "cache\n"); | |
179 | nfsd_export_flush(); | |
bc591ccf | 180 | } |
6658d3a7 N |
181 | |
182 | void nfsd_reset_versions(void) | |
183 | { | |
184 | int found_one = 0; | |
185 | int i; | |
186 | ||
187 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
188 | if (nfsd_program.pg_vers[i]) | |
189 | found_one = 1; | |
190 | } | |
191 | ||
192 | if (!found_one) { | |
193 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
194 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
195 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
196 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
197 | nfsd_acl_program.pg_vers[i] = | |
198 | nfsd_acl_version[i]; | |
199 | #endif | |
200 | } | |
201 | } | |
202 | ||
bedbdd8b | 203 | |
b41b66d6 | 204 | int nfsd_create_serv(void) |
02a375f0 N |
205 | { |
206 | int err = 0; | |
bedbdd8b NB |
207 | |
208 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); | |
02a375f0 | 209 | if (nfsd_serv) { |
9a24ab57 | 210 | svc_get(nfsd_serv); |
02a375f0 N |
211 | return 0; |
212 | } | |
596bbe53 N |
213 | if (nfsd_max_blksize == 0) { |
214 | /* choose a suitable default */ | |
215 | struct sysinfo i; | |
216 | si_meminfo(&i); | |
217 | /* Aim for 1/4096 of memory per thread | |
218 | * This gives 1MB on 4Gig machines | |
219 | * But only uses 32K on 128M machines. | |
220 | * Bottom out at 8K on 32M and smaller. | |
221 | * Of course, this is only a default. | |
222 | */ | |
223 | nfsd_max_blksize = NFSSVC_MAXBLKSIZE; | |
44c55600 | 224 | i.totalram <<= PAGE_SHIFT - 12; |
596bbe53 N |
225 | while (nfsd_max_blksize > i.totalram && |
226 | nfsd_max_blksize >= 8*1024*2) | |
227 | nfsd_max_blksize /= 2; | |
228 | } | |
02a375f0 N |
229 | |
230 | atomic_set(&nfsd_busy, 0); | |
e096bbc6 | 231 | nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
e851db5b | 232 | AF_INET, |
a75c5d01 | 233 | nfsd_last_thread, nfsd, THIS_MODULE); |
02a375f0 N |
234 | if (nfsd_serv == NULL) |
235 | err = -ENOMEM; | |
bedbdd8b | 236 | |
02a375f0 N |
237 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
238 | return err; | |
239 | } | |
240 | ||
241 | static int nfsd_init_socks(int port) | |
242 | { | |
243 | int error; | |
244 | if (!list_empty(&nfsd_serv->sv_permsocks)) | |
245 | return 0; | |
246 | ||
26a41409 | 247 | error = svc_create_xprt(nfsd_serv, "udp", port, |
482fb94e | 248 | SVC_SOCK_DEFAULTS); |
02a375f0 N |
249 | if (error < 0) |
250 | return error; | |
251 | ||
1cd9cd16 CL |
252 | error = lockd_up(); |
253 | if (error < 0) | |
254 | return error; | |
255 | ||
26a41409 | 256 | error = svc_create_xprt(nfsd_serv, "tcp", port, |
482fb94e | 257 | SVC_SOCK_DEFAULTS); |
02a375f0 N |
258 | if (error < 0) |
259 | return error; | |
26a41409 CL |
260 | |
261 | error = lockd_up(); | |
262 | if (error < 0) | |
263 | return error; | |
264 | ||
02a375f0 N |
265 | return 0; |
266 | } | |
267 | ||
eed2965a GB |
268 | int nfsd_nrpools(void) |
269 | { | |
270 | if (nfsd_serv == NULL) | |
271 | return 0; | |
272 | else | |
273 | return nfsd_serv->sv_nrpools; | |
274 | } | |
275 | ||
276 | int nfsd_get_nrthreads(int n, int *nthreads) | |
277 | { | |
278 | int i = 0; | |
279 | ||
280 | if (nfsd_serv != NULL) { | |
281 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) | |
282 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; | |
283 | } | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | int nfsd_set_nrthreads(int n, int *nthreads) | |
289 | { | |
290 | int i = 0; | |
291 | int tot = 0; | |
292 | int err = 0; | |
293 | ||
bedbdd8b NB |
294 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
295 | ||
eed2965a GB |
296 | if (nfsd_serv == NULL || n <= 0) |
297 | return 0; | |
298 | ||
299 | if (n > nfsd_serv->sv_nrpools) | |
300 | n = nfsd_serv->sv_nrpools; | |
301 | ||
302 | /* enforce a global maximum number of threads */ | |
303 | tot = 0; | |
304 | for (i = 0; i < n; i++) { | |
305 | if (nthreads[i] > NFSD_MAXSERVS) | |
306 | nthreads[i] = NFSD_MAXSERVS; | |
307 | tot += nthreads[i]; | |
308 | } | |
309 | if (tot > NFSD_MAXSERVS) { | |
310 | /* total too large: scale down requested numbers */ | |
311 | for (i = 0; i < n && tot > 0; i++) { | |
312 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
313 | tot -= (nthreads[i] - new); | |
314 | nthreads[i] = new; | |
315 | } | |
316 | for (i = 0; i < n && tot > 0; i++) { | |
317 | nthreads[i]--; | |
318 | tot--; | |
319 | } | |
320 | } | |
321 | ||
322 | /* | |
323 | * There must always be a thread in pool 0; the admin | |
324 | * can't shut down NFS completely using pool_threads. | |
325 | */ | |
326 | if (nthreads[0] == 0) | |
327 | nthreads[0] = 1; | |
328 | ||
329 | /* apply the new numbers */ | |
eed2965a GB |
330 | svc_get(nfsd_serv); |
331 | for (i = 0; i < n; i++) { | |
332 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], | |
333 | nthreads[i]); | |
334 | if (err) | |
335 | break; | |
336 | } | |
337 | svc_destroy(nfsd_serv); | |
eed2965a GB |
338 | |
339 | return err; | |
340 | } | |
341 | ||
1da177e4 LT |
342 | int |
343 | nfsd_svc(unsigned short port, int nrservs) | |
344 | { | |
345 | int error; | |
bedbdd8b NB |
346 | |
347 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 348 | dprintk("nfsd: creating service\n"); |
1da177e4 LT |
349 | error = -EINVAL; |
350 | if (nrservs <= 0) | |
351 | nrservs = 0; | |
352 | if (nrservs > NFSD_MAXSERVS) | |
353 | nrservs = NFSD_MAXSERVS; | |
354 | ||
355 | /* Readahead param cache - will no-op if it already exists */ | |
356 | error = nfsd_racache_init(2*nrservs); | |
357 | if (error<0) | |
358 | goto out; | |
e8ff2a84 | 359 | nfs4_state_start(); |
02a375f0 N |
360 | |
361 | nfsd_reset_versions(); | |
362 | ||
363 | error = nfsd_create_serv(); | |
364 | ||
365 | if (error) | |
366 | goto out; | |
367 | error = nfsd_init_socks(port); | |
368 | if (error) | |
369 | goto failure; | |
370 | ||
eec09661 | 371 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
1da177e4 | 372 | failure: |
1da177e4 | 373 | svc_destroy(nfsd_serv); /* Release server */ |
1da177e4 | 374 | out: |
bedbdd8b | 375 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
376 | return error; |
377 | } | |
378 | ||
379 | static inline void | |
380 | update_thread_usage(int busy_threads) | |
381 | { | |
382 | unsigned long prev_call; | |
383 | unsigned long diff; | |
384 | int decile; | |
385 | ||
386 | spin_lock(&nfsd_call_lock); | |
387 | prev_call = nfsd_last_call; | |
388 | nfsd_last_call = jiffies; | |
389 | decile = busy_threads*10/nfsdstats.th_cnt; | |
390 | if (decile>0 && decile <= 10) { | |
391 | diff = nfsd_last_call - prev_call; | |
392 | if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP) | |
393 | nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP; | |
394 | if (decile == 10) | |
395 | nfsdstats.th_fullcnt++; | |
396 | } | |
397 | spin_unlock(&nfsd_call_lock); | |
398 | } | |
399 | ||
400 | /* | |
401 | * This is the NFS server kernel thread | |
402 | */ | |
9867d76c JL |
403 | static int |
404 | nfsd(void *vrqstp) | |
1da177e4 | 405 | { |
9867d76c | 406 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
1da177e4 | 407 | struct fs_struct *fsp; |
9867d76c | 408 | int err, preverr = 0; |
1da177e4 LT |
409 | |
410 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 411 | mutex_lock(&nfsd_mutex); |
1da177e4 | 412 | |
9867d76c | 413 | /* At this point, the thread shares current->fs |
1da177e4 LT |
414 | * with the init process. We need to create files with a |
415 | * umask of 0 instead of init's umask. */ | |
416 | fsp = copy_fs_struct(current->fs); | |
417 | if (!fsp) { | |
418 | printk("Unable to start nfsd thread: out of memory\n"); | |
419 | goto out; | |
420 | } | |
421 | exit_fs(current); | |
422 | current->fs = fsp; | |
423 | current->fs->umask = 0; | |
424 | ||
9867d76c JL |
425 | /* |
426 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
100766f8 | 427 | * the ones that will bring down the thread |
9867d76c | 428 | */ |
100766f8 JL |
429 | allow_signal(SIGKILL); |
430 | allow_signal(SIGHUP); | |
431 | allow_signal(SIGINT); | |
432 | allow_signal(SIGQUIT); | |
bedbdd8b | 433 | |
1da177e4 | 434 | nfsdstats.th_cnt++; |
bedbdd8b NB |
435 | mutex_unlock(&nfsd_mutex); |
436 | ||
1da177e4 LT |
437 | /* |
438 | * We want less throttling in balance_dirty_pages() so that nfs to | |
439 | * localhost doesn't cause nfsd to lock up due to all the client's | |
440 | * dirty pages. | |
441 | */ | |
442 | current->flags |= PF_LESS_THROTTLE; | |
83144186 | 443 | set_freezable(); |
1da177e4 LT |
444 | |
445 | /* | |
446 | * The main request loop | |
447 | */ | |
448 | for (;;) { | |
1da177e4 LT |
449 | /* |
450 | * Find a socket with data available and call its | |
451 | * recvfrom routine. | |
452 | */ | |
6fb2b47f | 453 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 454 | ; |
9867d76c | 455 | if (err == -EINTR) |
1da177e4 | 456 | break; |
9867d76c JL |
457 | else if (err < 0) { |
458 | if (err != preverr) { | |
459 | printk(KERN_WARNING "%s: unexpected error " | |
460 | "from svc_recv (%d)\n", __func__, -err); | |
461 | preverr = err; | |
462 | } | |
463 | schedule_timeout_uninterruptible(HZ); | |
464 | continue; | |
465 | } | |
466 | ||
1da177e4 LT |
467 | update_thread_usage(atomic_read(&nfsd_busy)); |
468 | atomic_inc(&nfsd_busy); | |
469 | ||
470 | /* Lock the export hash tables for reading. */ | |
471 | exp_readlock(); | |
472 | ||
6fb2b47f | 473 | svc_process(rqstp); |
1da177e4 LT |
474 | |
475 | /* Unlock export hash tables */ | |
476 | exp_readunlock(); | |
477 | update_thread_usage(atomic_read(&nfsd_busy)); | |
478 | atomic_dec(&nfsd_busy); | |
479 | } | |
480 | ||
24e36663 | 481 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 482 | flush_signals(current); |
1da177e4 | 483 | |
bedbdd8b | 484 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
485 | nfsdstats.th_cnt --; |
486 | ||
487 | out: | |
488 | /* Release the thread */ | |
489 | svc_exit_thread(rqstp); | |
490 | ||
491 | /* Release module */ | |
bedbdd8b | 492 | mutex_unlock(&nfsd_mutex); |
1da177e4 | 493 | module_put_and_exit(0); |
9867d76c | 494 | return 0; |
1da177e4 LT |
495 | } |
496 | ||
32c1eb0c AA |
497 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
498 | { | |
499 | if (nfserr == nfserr_jukebox && vers == 2) | |
500 | return nfserr_dropit; | |
501 | if (nfserr == nfserr_wrongsec && vers < 4) | |
502 | return nfserr_acces; | |
503 | return nfserr; | |
504 | } | |
505 | ||
1da177e4 | 506 | int |
c7afef1f | 507 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
508 | { |
509 | struct svc_procedure *proc; | |
510 | kxdrproc_t xdr; | |
ad451d38 AV |
511 | __be32 nfserr; |
512 | __be32 *nfserrp; | |
1da177e4 LT |
513 | |
514 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
515 | rqstp->rq_vers, rqstp->rq_proc); | |
516 | proc = rqstp->rq_procinfo; | |
517 | ||
518 | /* Check whether we have this call in the cache. */ | |
519 | switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) { | |
520 | case RC_INTR: | |
521 | case RC_DROPIT: | |
522 | return 0; | |
523 | case RC_REPLY: | |
524 | return 1; | |
525 | case RC_DOIT:; | |
526 | /* do it */ | |
527 | } | |
528 | ||
529 | /* Decode arguments */ | |
530 | xdr = proc->pc_decode; | |
ad451d38 | 531 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, |
1da177e4 LT |
532 | rqstp->rq_argp)) { |
533 | dprintk("nfsd: failed to decode arguments!\n"); | |
534 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
535 | *statp = rpc_garbage_args; | |
536 | return 1; | |
537 | } | |
538 | ||
539 | /* need to grab the location to store the status, as | |
540 | * nfsv4 does some encoding while processing | |
541 | */ | |
542 | nfserrp = rqstp->rq_res.head[0].iov_base | |
543 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 544 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
545 | |
546 | /* Now call the procedure handler, and encode NFS status. */ | |
547 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 548 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
1da177e4 | 549 | if (nfserr == nfserr_dropit) { |
45457e09 | 550 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
551 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
552 | return 0; | |
553 | } | |
554 | ||
555 | if (rqstp->rq_proc != 0) | |
556 | *nfserrp++ = nfserr; | |
557 | ||
558 | /* Encode result. | |
559 | * For NFSv2, additional info is never returned in case of an error. | |
560 | */ | |
561 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
562 | xdr = proc->pc_encode; | |
563 | if (xdr && !xdr(rqstp, nfserrp, | |
564 | rqstp->rq_resp)) { | |
565 | /* Failed to encode result. Release cache entry */ | |
566 | dprintk("nfsd: failed to encode result!\n"); | |
567 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
568 | *statp = rpc_system_err; | |
569 | return 1; | |
570 | } | |
571 | } | |
572 | ||
573 | /* Store reply in cache. */ | |
574 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); | |
575 | return 1; | |
576 | } |