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 | ||
40 | /* these signals will be delivered to an nfsd thread | |
41 | * when handling a request | |
42 | */ | |
43 | #define ALLOWED_SIGS (sigmask(SIGKILL)) | |
44 | /* these signals will be delivered to an nfsd thread | |
45 | * when not handling a request. i.e. when waiting | |
46 | */ | |
47 | #define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT)) | |
1da177e4 LT |
48 | |
49 | extern struct svc_program nfsd_program; | |
9867d76c | 50 | static int nfsd(void *vrqstp); |
1da177e4 | 51 | struct timeval nfssvc_boot; |
1da177e4 LT |
52 | static atomic_t nfsd_busy; |
53 | static unsigned long nfsd_last_call; | |
54 | static DEFINE_SPINLOCK(nfsd_call_lock); | |
55 | ||
bedbdd8b NB |
56 | /* |
57 | * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members | |
58 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some | |
59 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt | |
60 | * | |
61 | * If (out side the lock) nfsd_serv is non-NULL, then it must point to a | |
62 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number | |
63 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each | |
64 | * entry of ->sv_pools[]. | |
65 | * | |
66 | * Transitions of the thread count between zero and non-zero are of particular | |
67 | * interest since the svc_serv needs to be created and initialized at that | |
68 | * point, or freed. | |
3dd98a3b JL |
69 | * |
70 | * Finally, the nfsd_mutex also protects some of the global variables that are | |
71 | * accessed when nfsd starts and that are settable via the write_* routines in | |
72 | * nfsctl.c. In particular: | |
73 | * | |
74 | * user_recovery_dirname | |
75 | * user_lease_time | |
76 | * nfsd_versions | |
bedbdd8b NB |
77 | */ |
78 | DEFINE_MUTEX(nfsd_mutex); | |
79 | struct svc_serv *nfsd_serv; | |
80 | ||
3fb803a9 AG |
81 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
82 | static struct svc_stat nfsd_acl_svcstats; | |
83 | static struct svc_version * nfsd_acl_version[] = { | |
84 | [2] = &nfsd_acl_version2, | |
85 | [3] = &nfsd_acl_version3, | |
86 | }; | |
87 | ||
88 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 89 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
90 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
91 | ||
92 | static struct svc_program nfsd_acl_program = { | |
93 | .pg_prog = NFS_ACL_PROGRAM, | |
94 | .pg_nvers = NFSD_ACL_NRVERS, | |
95 | .pg_vers = nfsd_acl_versions, | |
1a8eff6d | 96 | .pg_name = "nfsacl", |
3fb803a9 AG |
97 | .pg_class = "nfsd", |
98 | .pg_stats = &nfsd_acl_svcstats, | |
99 | .pg_authenticate = &svc_set_client, | |
100 | }; | |
101 | ||
102 | static struct svc_stat nfsd_acl_svcstats = { | |
103 | .program = &nfsd_acl_program, | |
104 | }; | |
105 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
106 | ||
70c3b76c N |
107 | static struct svc_version * nfsd_version[] = { |
108 | [2] = &nfsd_version2, | |
109 | #if defined(CONFIG_NFSD_V3) | |
110 | [3] = &nfsd_version3, | |
111 | #endif | |
112 | #if defined(CONFIG_NFSD_V4) | |
113 | [4] = &nfsd_version4, | |
114 | #endif | |
115 | }; | |
116 | ||
117 | #define NFSD_MINVERS 2 | |
e8c96f8c | 118 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
119 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
120 | ||
121 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
122 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
123 | .pg_next = &nfsd_acl_program, | |
124 | #endif | |
70c3b76c N |
125 | .pg_prog = NFS_PROGRAM, /* program number */ |
126 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
127 | .pg_vers = nfsd_versions, /* version table */ | |
128 | .pg_name = "nfsd", /* program name */ | |
129 | .pg_class = "nfsd", /* authentication class */ | |
130 | .pg_stats = &nfsd_svcstats, /* version table */ | |
131 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
132 | ||
133 | }; | |
134 | ||
6658d3a7 N |
135 | int nfsd_vers(int vers, enum vers_op change) |
136 | { | |
137 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
138 | return -1; | |
139 | switch(change) { | |
140 | case NFSD_SET: | |
141 | nfsd_versions[vers] = nfsd_version[vers]; | |
6658d3a7 N |
142 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
143 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 144 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
6658d3a7 | 145 | #endif |
1a8eff6d | 146 | break; |
6658d3a7 N |
147 | case NFSD_CLEAR: |
148 | nfsd_versions[vers] = NULL; | |
149 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
150 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 151 | nfsd_acl_versions[vers] = NULL; |
6658d3a7 N |
152 | #endif |
153 | break; | |
154 | case NFSD_TEST: | |
155 | return nfsd_versions[vers] != NULL; | |
156 | case NFSD_AVAIL: | |
157 | return nfsd_version[vers] != NULL; | |
158 | } | |
159 | return 0; | |
160 | } | |
1da177e4 LT |
161 | /* |
162 | * Maximum number of nfsd processes | |
163 | */ | |
164 | #define NFSD_MAXSERVS 8192 | |
165 | ||
166 | int nfsd_nrthreads(void) | |
167 | { | |
c7d106c9 NB |
168 | int rv = 0; |
169 | mutex_lock(&nfsd_mutex); | |
170 | if (nfsd_serv) | |
171 | rv = nfsd_serv->sv_nrthreads; | |
172 | mutex_unlock(&nfsd_mutex); | |
173 | return rv; | |
1da177e4 LT |
174 | } |
175 | ||
bc591ccf N |
176 | static void nfsd_last_thread(struct svc_serv *serv) |
177 | { | |
178 | /* When last nfsd thread exits we need to do some clean-up */ | |
7a182083 TT |
179 | struct svc_xprt *xprt; |
180 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) | |
24e36663 | 181 | lockd_down(); |
bc591ccf N |
182 | nfsd_serv = NULL; |
183 | nfsd_racache_shutdown(); | |
184 | nfs4_state_shutdown(); | |
185 | ||
e096bbc6 JL |
186 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
187 | "cache\n"); | |
188 | nfsd_export_flush(); | |
bc591ccf | 189 | } |
6658d3a7 N |
190 | |
191 | void nfsd_reset_versions(void) | |
192 | { | |
193 | int found_one = 0; | |
194 | int i; | |
195 | ||
196 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
197 | if (nfsd_program.pg_vers[i]) | |
198 | found_one = 1; | |
199 | } | |
200 | ||
201 | if (!found_one) { | |
202 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
203 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
204 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
205 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
206 | nfsd_acl_program.pg_vers[i] = | |
207 | nfsd_acl_version[i]; | |
208 | #endif | |
209 | } | |
210 | } | |
211 | ||
bedbdd8b | 212 | |
b41b66d6 | 213 | int nfsd_create_serv(void) |
02a375f0 N |
214 | { |
215 | int err = 0; | |
bedbdd8b NB |
216 | |
217 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); | |
02a375f0 | 218 | if (nfsd_serv) { |
9a24ab57 | 219 | svc_get(nfsd_serv); |
02a375f0 N |
220 | return 0; |
221 | } | |
596bbe53 N |
222 | if (nfsd_max_blksize == 0) { |
223 | /* choose a suitable default */ | |
224 | struct sysinfo i; | |
225 | si_meminfo(&i); | |
226 | /* Aim for 1/4096 of memory per thread | |
227 | * This gives 1MB on 4Gig machines | |
228 | * But only uses 32K on 128M machines. | |
229 | * Bottom out at 8K on 32M and smaller. | |
230 | * Of course, this is only a default. | |
231 | */ | |
232 | nfsd_max_blksize = NFSSVC_MAXBLKSIZE; | |
44c55600 | 233 | i.totalram <<= PAGE_SHIFT - 12; |
596bbe53 N |
234 | while (nfsd_max_blksize > i.totalram && |
235 | nfsd_max_blksize >= 8*1024*2) | |
236 | nfsd_max_blksize /= 2; | |
237 | } | |
02a375f0 N |
238 | |
239 | atomic_set(&nfsd_busy, 0); | |
e096bbc6 | 240 | nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
a75c5d01 | 241 | nfsd_last_thread, nfsd, THIS_MODULE); |
02a375f0 N |
242 | if (nfsd_serv == NULL) |
243 | err = -ENOMEM; | |
bedbdd8b | 244 | |
02a375f0 N |
245 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
246 | return err; | |
247 | } | |
248 | ||
249 | static int nfsd_init_socks(int port) | |
250 | { | |
251 | int error; | |
252 | if (!list_empty(&nfsd_serv->sv_permsocks)) | |
253 | return 0; | |
254 | ||
02a375f0 | 255 | error = lockd_up(IPPROTO_UDP); |
4a3ae42d | 256 | if (error >= 0) { |
d7c9f1ed | 257 | error = svc_create_xprt(nfsd_serv, "udp", port, |
482fb94e | 258 | SVC_SOCK_DEFAULTS); |
4a3ae42d N |
259 | if (error < 0) |
260 | lockd_down(); | |
261 | } | |
02a375f0 N |
262 | if (error < 0) |
263 | return error; | |
264 | ||
02a375f0 | 265 | error = lockd_up(IPPROTO_TCP); |
4a3ae42d | 266 | if (error >= 0) { |
d7c9f1ed | 267 | error = svc_create_xprt(nfsd_serv, "tcp", port, |
482fb94e | 268 | SVC_SOCK_DEFAULTS); |
4a3ae42d N |
269 | if (error < 0) |
270 | lockd_down(); | |
271 | } | |
02a375f0 N |
272 | if (error < 0) |
273 | return error; | |
02a375f0 N |
274 | return 0; |
275 | } | |
276 | ||
eed2965a GB |
277 | int nfsd_nrpools(void) |
278 | { | |
279 | if (nfsd_serv == NULL) | |
280 | return 0; | |
281 | else | |
282 | return nfsd_serv->sv_nrpools; | |
283 | } | |
284 | ||
285 | int nfsd_get_nrthreads(int n, int *nthreads) | |
286 | { | |
287 | int i = 0; | |
288 | ||
289 | if (nfsd_serv != NULL) { | |
290 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) | |
291 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; | |
292 | } | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | int nfsd_set_nrthreads(int n, int *nthreads) | |
298 | { | |
299 | int i = 0; | |
300 | int tot = 0; | |
301 | int err = 0; | |
302 | ||
bedbdd8b NB |
303 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
304 | ||
eed2965a GB |
305 | if (nfsd_serv == NULL || n <= 0) |
306 | return 0; | |
307 | ||
308 | if (n > nfsd_serv->sv_nrpools) | |
309 | n = nfsd_serv->sv_nrpools; | |
310 | ||
311 | /* enforce a global maximum number of threads */ | |
312 | tot = 0; | |
313 | for (i = 0; i < n; i++) { | |
314 | if (nthreads[i] > NFSD_MAXSERVS) | |
315 | nthreads[i] = NFSD_MAXSERVS; | |
316 | tot += nthreads[i]; | |
317 | } | |
318 | if (tot > NFSD_MAXSERVS) { | |
319 | /* total too large: scale down requested numbers */ | |
320 | for (i = 0; i < n && tot > 0; i++) { | |
321 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
322 | tot -= (nthreads[i] - new); | |
323 | nthreads[i] = new; | |
324 | } | |
325 | for (i = 0; i < n && tot > 0; i++) { | |
326 | nthreads[i]--; | |
327 | tot--; | |
328 | } | |
329 | } | |
330 | ||
331 | /* | |
332 | * There must always be a thread in pool 0; the admin | |
333 | * can't shut down NFS completely using pool_threads. | |
334 | */ | |
335 | if (nthreads[0] == 0) | |
336 | nthreads[0] = 1; | |
337 | ||
338 | /* apply the new numbers */ | |
eed2965a GB |
339 | svc_get(nfsd_serv); |
340 | for (i = 0; i < n; i++) { | |
341 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], | |
342 | nthreads[i]); | |
343 | if (err) | |
344 | break; | |
345 | } | |
346 | svc_destroy(nfsd_serv); | |
eed2965a GB |
347 | |
348 | return err; | |
349 | } | |
350 | ||
1da177e4 LT |
351 | int |
352 | nfsd_svc(unsigned short port, int nrservs) | |
353 | { | |
354 | int error; | |
bedbdd8b NB |
355 | |
356 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 357 | dprintk("nfsd: creating service\n"); |
1da177e4 LT |
358 | error = -EINVAL; |
359 | if (nrservs <= 0) | |
360 | nrservs = 0; | |
361 | if (nrservs > NFSD_MAXSERVS) | |
362 | nrservs = NFSD_MAXSERVS; | |
363 | ||
364 | /* Readahead param cache - will no-op if it already exists */ | |
365 | error = nfsd_racache_init(2*nrservs); | |
366 | if (error<0) | |
367 | goto out; | |
e8ff2a84 | 368 | nfs4_state_start(); |
02a375f0 N |
369 | |
370 | nfsd_reset_versions(); | |
371 | ||
372 | error = nfsd_create_serv(); | |
373 | ||
374 | if (error) | |
375 | goto out; | |
376 | error = nfsd_init_socks(port); | |
377 | if (error) | |
378 | goto failure; | |
379 | ||
eec09661 | 380 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
1da177e4 | 381 | failure: |
1da177e4 | 382 | svc_destroy(nfsd_serv); /* Release server */ |
1da177e4 | 383 | out: |
bedbdd8b | 384 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
385 | return error; |
386 | } | |
387 | ||
388 | static inline void | |
389 | update_thread_usage(int busy_threads) | |
390 | { | |
391 | unsigned long prev_call; | |
392 | unsigned long diff; | |
393 | int decile; | |
394 | ||
395 | spin_lock(&nfsd_call_lock); | |
396 | prev_call = nfsd_last_call; | |
397 | nfsd_last_call = jiffies; | |
398 | decile = busy_threads*10/nfsdstats.th_cnt; | |
399 | if (decile>0 && decile <= 10) { | |
400 | diff = nfsd_last_call - prev_call; | |
401 | if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP) | |
402 | nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP; | |
403 | if (decile == 10) | |
404 | nfsdstats.th_fullcnt++; | |
405 | } | |
406 | spin_unlock(&nfsd_call_lock); | |
407 | } | |
408 | ||
409 | /* | |
410 | * This is the NFS server kernel thread | |
411 | */ | |
9867d76c JL |
412 | static int |
413 | nfsd(void *vrqstp) | |
1da177e4 | 414 | { |
9867d76c | 415 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
1da177e4 | 416 | struct fs_struct *fsp; |
1da177e4 | 417 | sigset_t shutdown_mask, allowed_mask; |
9867d76c JL |
418 | int err, preverr = 0; |
419 | unsigned int signo; | |
1da177e4 LT |
420 | |
421 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 422 | mutex_lock(&nfsd_mutex); |
1da177e4 | 423 | |
9867d76c | 424 | /* At this point, the thread shares current->fs |
1da177e4 LT |
425 | * with the init process. We need to create files with a |
426 | * umask of 0 instead of init's umask. */ | |
427 | fsp = copy_fs_struct(current->fs); | |
428 | if (!fsp) { | |
429 | printk("Unable to start nfsd thread: out of memory\n"); | |
430 | goto out; | |
431 | } | |
432 | exit_fs(current); | |
433 | current->fs = fsp; | |
434 | current->fs->umask = 0; | |
435 | ||
436 | siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS); | |
437 | siginitsetinv(&allowed_mask, ALLOWED_SIGS); | |
438 | ||
9867d76c JL |
439 | /* |
440 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
441 | * the ones that matter | |
442 | */ | |
443 | for (signo = 1; signo <= _NSIG; signo++) { | |
444 | if (!sigismember(&shutdown_mask, signo)) | |
445 | allow_signal(signo); | |
446 | } | |
bedbdd8b | 447 | |
1da177e4 | 448 | nfsdstats.th_cnt++; |
bedbdd8b NB |
449 | mutex_unlock(&nfsd_mutex); |
450 | ||
1da177e4 LT |
451 | /* |
452 | * We want less throttling in balance_dirty_pages() so that nfs to | |
453 | * localhost doesn't cause nfsd to lock up due to all the client's | |
454 | * dirty pages. | |
455 | */ | |
456 | current->flags |= PF_LESS_THROTTLE; | |
83144186 | 457 | set_freezable(); |
1da177e4 LT |
458 | |
459 | /* | |
460 | * The main request loop | |
461 | */ | |
462 | for (;;) { | |
463 | /* Block all but the shutdown signals */ | |
464 | sigprocmask(SIG_SETMASK, &shutdown_mask, NULL); | |
465 | ||
466 | /* | |
467 | * Find a socket with data available and call its | |
468 | * recvfrom routine. | |
469 | */ | |
6fb2b47f | 470 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 471 | ; |
9867d76c | 472 | if (err == -EINTR) |
1da177e4 | 473 | break; |
9867d76c JL |
474 | else if (err < 0) { |
475 | if (err != preverr) { | |
476 | printk(KERN_WARNING "%s: unexpected error " | |
477 | "from svc_recv (%d)\n", __func__, -err); | |
478 | preverr = err; | |
479 | } | |
480 | schedule_timeout_uninterruptible(HZ); | |
481 | continue; | |
482 | } | |
483 | ||
1da177e4 LT |
484 | update_thread_usage(atomic_read(&nfsd_busy)); |
485 | atomic_inc(&nfsd_busy); | |
486 | ||
487 | /* Lock the export hash tables for reading. */ | |
488 | exp_readlock(); | |
489 | ||
9867d76c | 490 | /* Process request with signals blocked. */ |
1da177e4 LT |
491 | sigprocmask(SIG_SETMASK, &allowed_mask, NULL); |
492 | ||
6fb2b47f | 493 | svc_process(rqstp); |
1da177e4 LT |
494 | |
495 | /* Unlock export hash tables */ | |
496 | exp_readunlock(); | |
497 | update_thread_usage(atomic_read(&nfsd_busy)); | |
498 | atomic_dec(&nfsd_busy); | |
499 | } | |
500 | ||
24e36663 | 501 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 502 | flush_signals(current); |
1da177e4 | 503 | |
bedbdd8b | 504 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
505 | nfsdstats.th_cnt --; |
506 | ||
507 | out: | |
508 | /* Release the thread */ | |
509 | svc_exit_thread(rqstp); | |
510 | ||
511 | /* Release module */ | |
bedbdd8b | 512 | mutex_unlock(&nfsd_mutex); |
1da177e4 | 513 | module_put_and_exit(0); |
9867d76c | 514 | return 0; |
1da177e4 LT |
515 | } |
516 | ||
32c1eb0c AA |
517 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
518 | { | |
519 | if (nfserr == nfserr_jukebox && vers == 2) | |
520 | return nfserr_dropit; | |
521 | if (nfserr == nfserr_wrongsec && vers < 4) | |
522 | return nfserr_acces; | |
523 | return nfserr; | |
524 | } | |
525 | ||
1da177e4 | 526 | int |
c7afef1f | 527 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
528 | { |
529 | struct svc_procedure *proc; | |
530 | kxdrproc_t xdr; | |
ad451d38 AV |
531 | __be32 nfserr; |
532 | __be32 *nfserrp; | |
1da177e4 LT |
533 | |
534 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
535 | rqstp->rq_vers, rqstp->rq_proc); | |
536 | proc = rqstp->rq_procinfo; | |
537 | ||
538 | /* Check whether we have this call in the cache. */ | |
539 | switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) { | |
540 | case RC_INTR: | |
541 | case RC_DROPIT: | |
542 | return 0; | |
543 | case RC_REPLY: | |
544 | return 1; | |
545 | case RC_DOIT:; | |
546 | /* do it */ | |
547 | } | |
548 | ||
549 | /* Decode arguments */ | |
550 | xdr = proc->pc_decode; | |
ad451d38 | 551 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, |
1da177e4 LT |
552 | rqstp->rq_argp)) { |
553 | dprintk("nfsd: failed to decode arguments!\n"); | |
554 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
555 | *statp = rpc_garbage_args; | |
556 | return 1; | |
557 | } | |
558 | ||
559 | /* need to grab the location to store the status, as | |
560 | * nfsv4 does some encoding while processing | |
561 | */ | |
562 | nfserrp = rqstp->rq_res.head[0].iov_base | |
563 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 564 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
565 | |
566 | /* Now call the procedure handler, and encode NFS status. */ | |
567 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 568 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
1da177e4 | 569 | if (nfserr == nfserr_dropit) { |
45457e09 | 570 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
571 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
572 | return 0; | |
573 | } | |
574 | ||
575 | if (rqstp->rq_proc != 0) | |
576 | *nfserrp++ = nfserr; | |
577 | ||
578 | /* Encode result. | |
579 | * For NFSv2, additional info is never returned in case of an error. | |
580 | */ | |
581 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
582 | xdr = proc->pc_encode; | |
583 | if (xdr && !xdr(rqstp, nfserrp, | |
584 | rqstp->rq_resp)) { | |
585 | /* Failed to encode result. Release cache entry */ | |
586 | dprintk("nfsd: failed to encode result!\n"); | |
587 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
588 | *statp = rpc_system_err; | |
589 | return 1; | |
590 | } | |
591 | } | |
592 | ||
593 | /* Store reply in cache. */ | |
594 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); | |
595 | return 1; | |
596 | } |