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; | |
1da177e4 LT |
56 | static atomic_t nfsd_busy; |
57 | static unsigned long nfsd_last_call; | |
58 | static DEFINE_SPINLOCK(nfsd_call_lock); | |
59 | ||
bedbdd8b NB |
60 | /* |
61 | * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members | |
62 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some | |
63 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt | |
64 | * | |
65 | * If (out side the lock) nfsd_serv is non-NULL, then it must point to a | |
66 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number | |
67 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each | |
68 | * entry of ->sv_pools[]. | |
69 | * | |
70 | * Transitions of the thread count between zero and non-zero are of particular | |
71 | * interest since the svc_serv needs to be created and initialized at that | |
72 | * point, or freed. | |
3dd98a3b JL |
73 | * |
74 | * Finally, the nfsd_mutex also protects some of the global variables that are | |
75 | * accessed when nfsd starts and that are settable via the write_* routines in | |
76 | * nfsctl.c. In particular: | |
77 | * | |
78 | * user_recovery_dirname | |
79 | * user_lease_time | |
80 | * nfsd_versions | |
bedbdd8b NB |
81 | */ |
82 | DEFINE_MUTEX(nfsd_mutex); | |
83 | struct svc_serv *nfsd_serv; | |
84 | ||
3fb803a9 AG |
85 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
86 | static struct svc_stat nfsd_acl_svcstats; | |
87 | static struct svc_version * nfsd_acl_version[] = { | |
88 | [2] = &nfsd_acl_version2, | |
89 | [3] = &nfsd_acl_version3, | |
90 | }; | |
91 | ||
92 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 93 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
94 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
95 | ||
96 | static struct svc_program nfsd_acl_program = { | |
97 | .pg_prog = NFS_ACL_PROGRAM, | |
98 | .pg_nvers = NFSD_ACL_NRVERS, | |
99 | .pg_vers = nfsd_acl_versions, | |
1a8eff6d | 100 | .pg_name = "nfsacl", |
3fb803a9 AG |
101 | .pg_class = "nfsd", |
102 | .pg_stats = &nfsd_acl_svcstats, | |
103 | .pg_authenticate = &svc_set_client, | |
104 | }; | |
105 | ||
106 | static struct svc_stat nfsd_acl_svcstats = { | |
107 | .program = &nfsd_acl_program, | |
108 | }; | |
109 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
110 | ||
70c3b76c N |
111 | static struct svc_version * nfsd_version[] = { |
112 | [2] = &nfsd_version2, | |
113 | #if defined(CONFIG_NFSD_V3) | |
114 | [3] = &nfsd_version3, | |
115 | #endif | |
116 | #if defined(CONFIG_NFSD_V4) | |
117 | [4] = &nfsd_version4, | |
118 | #endif | |
119 | }; | |
120 | ||
121 | #define NFSD_MINVERS 2 | |
e8c96f8c | 122 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
123 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
124 | ||
125 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
126 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
127 | .pg_next = &nfsd_acl_program, | |
128 | #endif | |
70c3b76c N |
129 | .pg_prog = NFS_PROGRAM, /* program number */ |
130 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
131 | .pg_vers = nfsd_versions, /* version table */ | |
132 | .pg_name = "nfsd", /* program name */ | |
133 | .pg_class = "nfsd", /* authentication class */ | |
134 | .pg_stats = &nfsd_svcstats, /* version table */ | |
135 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
136 | ||
137 | }; | |
138 | ||
6658d3a7 N |
139 | int nfsd_vers(int vers, enum vers_op change) |
140 | { | |
141 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
142 | return -1; | |
143 | switch(change) { | |
144 | case NFSD_SET: | |
145 | nfsd_versions[vers] = nfsd_version[vers]; | |
6658d3a7 N |
146 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
147 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 148 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
6658d3a7 | 149 | #endif |
1a8eff6d | 150 | break; |
6658d3a7 N |
151 | case NFSD_CLEAR: |
152 | nfsd_versions[vers] = NULL; | |
153 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
154 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 155 | nfsd_acl_versions[vers] = NULL; |
6658d3a7 N |
156 | #endif |
157 | break; | |
158 | case NFSD_TEST: | |
159 | return nfsd_versions[vers] != NULL; | |
160 | case NFSD_AVAIL: | |
161 | return nfsd_version[vers] != NULL; | |
162 | } | |
163 | return 0; | |
164 | } | |
1da177e4 LT |
165 | /* |
166 | * Maximum number of nfsd processes | |
167 | */ | |
168 | #define NFSD_MAXSERVS 8192 | |
169 | ||
170 | int nfsd_nrthreads(void) | |
171 | { | |
172 | if (nfsd_serv == NULL) | |
173 | return 0; | |
174 | else | |
175 | return nfsd_serv->sv_nrthreads; | |
176 | } | |
177 | ||
bc591ccf N |
178 | static int killsig; /* signal that was used to kill last nfsd */ |
179 | static void nfsd_last_thread(struct svc_serv *serv) | |
180 | { | |
181 | /* When last nfsd thread exits we need to do some clean-up */ | |
7a182083 TT |
182 | struct svc_xprt *xprt; |
183 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) | |
24e36663 | 184 | lockd_down(); |
bc591ccf N |
185 | nfsd_serv = NULL; |
186 | nfsd_racache_shutdown(); | |
187 | nfs4_state_shutdown(); | |
188 | ||
189 | printk(KERN_WARNING "nfsd: last server has exited\n"); | |
190 | if (killsig != SIG_NOCLEAN) { | |
191 | printk(KERN_WARNING "nfsd: unexporting all filesystems\n"); | |
192 | nfsd_export_flush(); | |
193 | } | |
194 | } | |
6658d3a7 N |
195 | |
196 | void nfsd_reset_versions(void) | |
197 | { | |
198 | int found_one = 0; | |
199 | int i; | |
200 | ||
201 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
202 | if (nfsd_program.pg_vers[i]) | |
203 | found_one = 1; | |
204 | } | |
205 | ||
206 | if (!found_one) { | |
207 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
208 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
209 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
210 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
211 | nfsd_acl_program.pg_vers[i] = | |
212 | nfsd_acl_version[i]; | |
213 | #endif | |
214 | } | |
215 | } | |
216 | ||
bedbdd8b | 217 | |
b41b66d6 | 218 | int nfsd_create_serv(void) |
02a375f0 N |
219 | { |
220 | int err = 0; | |
bedbdd8b NB |
221 | |
222 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); | |
02a375f0 | 223 | if (nfsd_serv) { |
9a24ab57 | 224 | svc_get(nfsd_serv); |
02a375f0 N |
225 | return 0; |
226 | } | |
596bbe53 N |
227 | if (nfsd_max_blksize == 0) { |
228 | /* choose a suitable default */ | |
229 | struct sysinfo i; | |
230 | si_meminfo(&i); | |
231 | /* Aim for 1/4096 of memory per thread | |
232 | * This gives 1MB on 4Gig machines | |
233 | * But only uses 32K on 128M machines. | |
234 | * Bottom out at 8K on 32M and smaller. | |
235 | * Of course, this is only a default. | |
236 | */ | |
237 | nfsd_max_blksize = NFSSVC_MAXBLKSIZE; | |
44c55600 | 238 | i.totalram <<= PAGE_SHIFT - 12; |
596bbe53 N |
239 | while (nfsd_max_blksize > i.totalram && |
240 | nfsd_max_blksize >= 8*1024*2) | |
241 | nfsd_max_blksize /= 2; | |
242 | } | |
02a375f0 N |
243 | |
244 | atomic_set(&nfsd_busy, 0); | |
596bbe53 | 245 | nfsd_serv = svc_create_pooled(&nfsd_program, |
c6b0a9f8 | 246 | nfsd_max_blksize, |
eec09661 GB |
247 | nfsd_last_thread, |
248 | nfsd, SIG_NOCLEAN, THIS_MODULE); | |
02a375f0 N |
249 | if (nfsd_serv == NULL) |
250 | err = -ENOMEM; | |
bedbdd8b | 251 | |
02a375f0 N |
252 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
253 | return err; | |
254 | } | |
255 | ||
256 | static int nfsd_init_socks(int port) | |
257 | { | |
258 | int error; | |
259 | if (!list_empty(&nfsd_serv->sv_permsocks)) | |
260 | return 0; | |
261 | ||
02a375f0 | 262 | error = lockd_up(IPPROTO_UDP); |
4a3ae42d | 263 | if (error >= 0) { |
d7c9f1ed | 264 | error = svc_create_xprt(nfsd_serv, "udp", port, |
482fb94e | 265 | SVC_SOCK_DEFAULTS); |
4a3ae42d N |
266 | if (error < 0) |
267 | lockd_down(); | |
268 | } | |
02a375f0 N |
269 | if (error < 0) |
270 | return error; | |
271 | ||
02a375f0 | 272 | error = lockd_up(IPPROTO_TCP); |
4a3ae42d | 273 | if (error >= 0) { |
d7c9f1ed | 274 | error = svc_create_xprt(nfsd_serv, "tcp", port, |
482fb94e | 275 | SVC_SOCK_DEFAULTS); |
4a3ae42d N |
276 | if (error < 0) |
277 | lockd_down(); | |
278 | } | |
02a375f0 N |
279 | if (error < 0) |
280 | return error; | |
02a375f0 N |
281 | return 0; |
282 | } | |
283 | ||
eed2965a GB |
284 | int nfsd_nrpools(void) |
285 | { | |
286 | if (nfsd_serv == NULL) | |
287 | return 0; | |
288 | else | |
289 | return nfsd_serv->sv_nrpools; | |
290 | } | |
291 | ||
292 | int nfsd_get_nrthreads(int n, int *nthreads) | |
293 | { | |
294 | int i = 0; | |
295 | ||
296 | if (nfsd_serv != NULL) { | |
297 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) | |
298 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; | |
299 | } | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | int nfsd_set_nrthreads(int n, int *nthreads) | |
305 | { | |
306 | int i = 0; | |
307 | int tot = 0; | |
308 | int err = 0; | |
309 | ||
bedbdd8b NB |
310 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
311 | ||
eed2965a GB |
312 | if (nfsd_serv == NULL || n <= 0) |
313 | return 0; | |
314 | ||
315 | if (n > nfsd_serv->sv_nrpools) | |
316 | n = nfsd_serv->sv_nrpools; | |
317 | ||
318 | /* enforce a global maximum number of threads */ | |
319 | tot = 0; | |
320 | for (i = 0; i < n; i++) { | |
321 | if (nthreads[i] > NFSD_MAXSERVS) | |
322 | nthreads[i] = NFSD_MAXSERVS; | |
323 | tot += nthreads[i]; | |
324 | } | |
325 | if (tot > NFSD_MAXSERVS) { | |
326 | /* total too large: scale down requested numbers */ | |
327 | for (i = 0; i < n && tot > 0; i++) { | |
328 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
329 | tot -= (nthreads[i] - new); | |
330 | nthreads[i] = new; | |
331 | } | |
332 | for (i = 0; i < n && tot > 0; i++) { | |
333 | nthreads[i]--; | |
334 | tot--; | |
335 | } | |
336 | } | |
337 | ||
338 | /* | |
339 | * There must always be a thread in pool 0; the admin | |
340 | * can't shut down NFS completely using pool_threads. | |
341 | */ | |
342 | if (nthreads[0] == 0) | |
343 | nthreads[0] = 1; | |
344 | ||
345 | /* apply the new numbers */ | |
eed2965a GB |
346 | svc_get(nfsd_serv); |
347 | for (i = 0; i < n; i++) { | |
348 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], | |
349 | nthreads[i]); | |
350 | if (err) | |
351 | break; | |
352 | } | |
353 | svc_destroy(nfsd_serv); | |
eed2965a GB |
354 | |
355 | return err; | |
356 | } | |
357 | ||
1da177e4 LT |
358 | int |
359 | nfsd_svc(unsigned short port, int nrservs) | |
360 | { | |
361 | int error; | |
bedbdd8b NB |
362 | |
363 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 364 | dprintk("nfsd: creating service\n"); |
1da177e4 LT |
365 | error = -EINVAL; |
366 | if (nrservs <= 0) | |
367 | nrservs = 0; | |
368 | if (nrservs > NFSD_MAXSERVS) | |
369 | nrservs = NFSD_MAXSERVS; | |
370 | ||
371 | /* Readahead param cache - will no-op if it already exists */ | |
372 | error = nfsd_racache_init(2*nrservs); | |
373 | if (error<0) | |
374 | goto out; | |
e8ff2a84 | 375 | nfs4_state_start(); |
02a375f0 N |
376 | |
377 | nfsd_reset_versions(); | |
378 | ||
379 | error = nfsd_create_serv(); | |
380 | ||
381 | if (error) | |
382 | goto out; | |
383 | error = nfsd_init_socks(port); | |
384 | if (error) | |
385 | goto failure; | |
386 | ||
eec09661 | 387 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
1da177e4 | 388 | failure: |
1da177e4 | 389 | svc_destroy(nfsd_serv); /* Release server */ |
1da177e4 | 390 | out: |
bedbdd8b | 391 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
392 | return error; |
393 | } | |
394 | ||
395 | static inline void | |
396 | update_thread_usage(int busy_threads) | |
397 | { | |
398 | unsigned long prev_call; | |
399 | unsigned long diff; | |
400 | int decile; | |
401 | ||
402 | spin_lock(&nfsd_call_lock); | |
403 | prev_call = nfsd_last_call; | |
404 | nfsd_last_call = jiffies; | |
405 | decile = busy_threads*10/nfsdstats.th_cnt; | |
406 | if (decile>0 && decile <= 10) { | |
407 | diff = nfsd_last_call - prev_call; | |
408 | if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP) | |
409 | nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP; | |
410 | if (decile == 10) | |
411 | nfsdstats.th_fullcnt++; | |
412 | } | |
413 | spin_unlock(&nfsd_call_lock); | |
414 | } | |
415 | ||
416 | /* | |
417 | * This is the NFS server kernel thread | |
418 | */ | |
419 | static void | |
420 | nfsd(struct svc_rqst *rqstp) | |
421 | { | |
1da177e4 LT |
422 | struct fs_struct *fsp; |
423 | int err; | |
1da177e4 LT |
424 | sigset_t shutdown_mask, allowed_mask; |
425 | ||
426 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 427 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
428 | daemonize("nfsd"); |
429 | ||
430 | /* After daemonize() this kernel thread shares current->fs | |
431 | * with the init process. We need to create files with a | |
432 | * umask of 0 instead of init's umask. */ | |
433 | fsp = copy_fs_struct(current->fs); | |
434 | if (!fsp) { | |
435 | printk("Unable to start nfsd thread: out of memory\n"); | |
436 | goto out; | |
437 | } | |
438 | exit_fs(current); | |
439 | current->fs = fsp; | |
440 | current->fs->umask = 0; | |
441 | ||
442 | siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS); | |
443 | siginitsetinv(&allowed_mask, ALLOWED_SIGS); | |
444 | ||
bedbdd8b | 445 | |
1da177e4 LT |
446 | nfsdstats.th_cnt++; |
447 | ||
eec09661 | 448 | rqstp->rq_task = current; |
1da177e4 | 449 | |
bedbdd8b NB |
450 | mutex_unlock(&nfsd_mutex); |
451 | ||
1da177e4 LT |
452 | |
453 | /* | |
454 | * We want less throttling in balance_dirty_pages() so that nfs to | |
455 | * localhost doesn't cause nfsd to lock up due to all the client's | |
456 | * dirty pages. | |
457 | */ | |
458 | current->flags |= PF_LESS_THROTTLE; | |
83144186 | 459 | set_freezable(); |
1da177e4 LT |
460 | |
461 | /* | |
462 | * The main request loop | |
463 | */ | |
464 | for (;;) { | |
465 | /* Block all but the shutdown signals */ | |
466 | sigprocmask(SIG_SETMASK, &shutdown_mask, NULL); | |
467 | ||
468 | /* | |
469 | * Find a socket with data available and call its | |
470 | * recvfrom routine. | |
471 | */ | |
6fb2b47f | 472 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 LT |
473 | ; |
474 | if (err < 0) | |
475 | break; | |
476 | update_thread_usage(atomic_read(&nfsd_busy)); | |
477 | atomic_inc(&nfsd_busy); | |
478 | ||
479 | /* Lock the export hash tables for reading. */ | |
480 | exp_readlock(); | |
481 | ||
482 | /* Process request with signals blocked. */ | |
483 | sigprocmask(SIG_SETMASK, &allowed_mask, NULL); | |
484 | ||
6fb2b47f | 485 | svc_process(rqstp); |
1da177e4 LT |
486 | |
487 | /* Unlock export hash tables */ | |
488 | exp_readunlock(); | |
489 | update_thread_usage(atomic_read(&nfsd_busy)); | |
490 | atomic_dec(&nfsd_busy); | |
491 | } | |
492 | ||
493 | if (err != -EINTR) { | |
494 | printk(KERN_WARNING "nfsd: terminating on error %d\n", -err); | |
495 | } else { | |
496 | unsigned int signo; | |
497 | ||
498 | for (signo = 1; signo <= _NSIG; signo++) | |
499 | if (sigismember(¤t->pending.signal, signo) && | |
500 | !sigismember(¤t->blocked, signo)) | |
501 | break; | |
bc591ccf | 502 | killsig = signo; |
1da177e4 | 503 | } |
24e36663 | 504 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 505 | flush_signals(current); |
1da177e4 | 506 | |
bedbdd8b | 507 | mutex_lock(&nfsd_mutex); |
1da177e4 | 508 | |
1da177e4 LT |
509 | nfsdstats.th_cnt --; |
510 | ||
511 | out: | |
512 | /* Release the thread */ | |
513 | svc_exit_thread(rqstp); | |
514 | ||
515 | /* Release module */ | |
bedbdd8b | 516 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
517 | module_put_and_exit(0); |
518 | } | |
519 | ||
32c1eb0c AA |
520 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
521 | { | |
522 | if (nfserr == nfserr_jukebox && vers == 2) | |
523 | return nfserr_dropit; | |
524 | if (nfserr == nfserr_wrongsec && vers < 4) | |
525 | return nfserr_acces; | |
526 | return nfserr; | |
527 | } | |
528 | ||
1da177e4 | 529 | int |
c7afef1f | 530 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
531 | { |
532 | struct svc_procedure *proc; | |
533 | kxdrproc_t xdr; | |
ad451d38 AV |
534 | __be32 nfserr; |
535 | __be32 *nfserrp; | |
1da177e4 LT |
536 | |
537 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
538 | rqstp->rq_vers, rqstp->rq_proc); | |
539 | proc = rqstp->rq_procinfo; | |
540 | ||
541 | /* Check whether we have this call in the cache. */ | |
542 | switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) { | |
543 | case RC_INTR: | |
544 | case RC_DROPIT: | |
545 | return 0; | |
546 | case RC_REPLY: | |
547 | return 1; | |
548 | case RC_DOIT:; | |
549 | /* do it */ | |
550 | } | |
551 | ||
552 | /* Decode arguments */ | |
553 | xdr = proc->pc_decode; | |
ad451d38 | 554 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, |
1da177e4 LT |
555 | rqstp->rq_argp)) { |
556 | dprintk("nfsd: failed to decode arguments!\n"); | |
557 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
558 | *statp = rpc_garbage_args; | |
559 | return 1; | |
560 | } | |
561 | ||
562 | /* need to grab the location to store the status, as | |
563 | * nfsv4 does some encoding while processing | |
564 | */ | |
565 | nfserrp = rqstp->rq_res.head[0].iov_base | |
566 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 567 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
568 | |
569 | /* Now call the procedure handler, and encode NFS status. */ | |
570 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 571 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
1da177e4 | 572 | if (nfserr == nfserr_dropit) { |
45457e09 | 573 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
574 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
575 | return 0; | |
576 | } | |
577 | ||
578 | if (rqstp->rq_proc != 0) | |
579 | *nfserrp++ = nfserr; | |
580 | ||
581 | /* Encode result. | |
582 | * For NFSv2, additional info is never returned in case of an error. | |
583 | */ | |
584 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
585 | xdr = proc->pc_encode; | |
586 | if (xdr && !xdr(rqstp, nfserrp, | |
587 | rqstp->rq_resp)) { | |
588 | /* Failed to encode result. Release cache entry */ | |
589 | dprintk("nfsd: failed to encode result!\n"); | |
590 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
591 | *statp = rpc_system_err; | |
592 | return 1; | |
593 | } | |
594 | } | |
595 | ||
596 | /* Store reply in cache. */ | |
597 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); | |
598 | return 1; | |
599 | } |