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 | ||
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 | ||
375 | static inline void | |
376 | update_thread_usage(int busy_threads) | |
377 | { | |
378 | unsigned long prev_call; | |
379 | unsigned long diff; | |
380 | int decile; | |
381 | ||
382 | spin_lock(&nfsd_call_lock); | |
383 | prev_call = nfsd_last_call; | |
384 | nfsd_last_call = jiffies; | |
385 | decile = busy_threads*10/nfsdstats.th_cnt; | |
386 | if (decile>0 && decile <= 10) { | |
387 | diff = nfsd_last_call - prev_call; | |
388 | if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP) | |
389 | nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP; | |
390 | if (decile == 10) | |
391 | nfsdstats.th_fullcnt++; | |
392 | } | |
393 | spin_unlock(&nfsd_call_lock); | |
394 | } | |
395 | ||
396 | /* | |
397 | * This is the NFS server kernel thread | |
398 | */ | |
9867d76c JL |
399 | static int |
400 | nfsd(void *vrqstp) | |
1da177e4 | 401 | { |
9867d76c | 402 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
1da177e4 | 403 | struct fs_struct *fsp; |
9867d76c | 404 | int err, preverr = 0; |
1da177e4 LT |
405 | |
406 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 407 | mutex_lock(&nfsd_mutex); |
1da177e4 | 408 | |
9867d76c | 409 | /* At this point, the thread shares current->fs |
1da177e4 LT |
410 | * with the init process. We need to create files with a |
411 | * umask of 0 instead of init's umask. */ | |
412 | fsp = copy_fs_struct(current->fs); | |
413 | if (!fsp) { | |
414 | printk("Unable to start nfsd thread: out of memory\n"); | |
415 | goto out; | |
416 | } | |
417 | exit_fs(current); | |
418 | current->fs = fsp; | |
419 | current->fs->umask = 0; | |
420 | ||
9867d76c JL |
421 | /* |
422 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
100766f8 | 423 | * the ones that will bring down the thread |
9867d76c | 424 | */ |
100766f8 JL |
425 | allow_signal(SIGKILL); |
426 | allow_signal(SIGHUP); | |
427 | allow_signal(SIGINT); | |
428 | allow_signal(SIGQUIT); | |
bedbdd8b | 429 | |
1da177e4 | 430 | nfsdstats.th_cnt++; |
bedbdd8b NB |
431 | mutex_unlock(&nfsd_mutex); |
432 | ||
1da177e4 LT |
433 | /* |
434 | * We want less throttling in balance_dirty_pages() so that nfs to | |
435 | * localhost doesn't cause nfsd to lock up due to all the client's | |
436 | * dirty pages. | |
437 | */ | |
438 | current->flags |= PF_LESS_THROTTLE; | |
83144186 | 439 | set_freezable(); |
1da177e4 LT |
440 | |
441 | /* | |
442 | * The main request loop | |
443 | */ | |
444 | for (;;) { | |
1da177e4 LT |
445 | /* |
446 | * Find a socket with data available and call its | |
447 | * recvfrom routine. | |
448 | */ | |
6fb2b47f | 449 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 450 | ; |
9867d76c | 451 | if (err == -EINTR) |
1da177e4 | 452 | break; |
9867d76c JL |
453 | else if (err < 0) { |
454 | if (err != preverr) { | |
455 | printk(KERN_WARNING "%s: unexpected error " | |
456 | "from svc_recv (%d)\n", __func__, -err); | |
457 | preverr = err; | |
458 | } | |
459 | schedule_timeout_uninterruptible(HZ); | |
460 | continue; | |
461 | } | |
462 | ||
1da177e4 LT |
463 | update_thread_usage(atomic_read(&nfsd_busy)); |
464 | atomic_inc(&nfsd_busy); | |
465 | ||
466 | /* Lock the export hash tables for reading. */ | |
467 | exp_readlock(); | |
468 | ||
6fb2b47f | 469 | svc_process(rqstp); |
1da177e4 LT |
470 | |
471 | /* Unlock export hash tables */ | |
472 | exp_readunlock(); | |
473 | update_thread_usage(atomic_read(&nfsd_busy)); | |
474 | atomic_dec(&nfsd_busy); | |
475 | } | |
476 | ||
24e36663 | 477 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 478 | flush_signals(current); |
1da177e4 | 479 | |
bedbdd8b | 480 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
481 | nfsdstats.th_cnt --; |
482 | ||
483 | out: | |
484 | /* Release the thread */ | |
485 | svc_exit_thread(rqstp); | |
486 | ||
487 | /* Release module */ | |
bedbdd8b | 488 | mutex_unlock(&nfsd_mutex); |
1da177e4 | 489 | module_put_and_exit(0); |
9867d76c | 490 | return 0; |
1da177e4 LT |
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 | } |