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Commit | Line | Data |
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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> | |
83144186 | 21 | #include <linux/freezer.h> |
1da177e4 | 22 | #include <linux/fs_struct.h> |
9867d76c | 23 | #include <linux/kthread.h> |
c3d06f9c | 24 | #include <linux/swap.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> |
ed2d8aed | 37 | #include <linux/seq_file.h> |
1da177e4 LT |
38 | |
39 | #define NFSDDBG_FACILITY NFSDDBG_SVC | |
40 | ||
1da177e4 | 41 | extern struct svc_program nfsd_program; |
9867d76c | 42 | static int nfsd(void *vrqstp); |
1da177e4 | 43 | struct timeval nfssvc_boot; |
1da177e4 | 44 | |
bedbdd8b NB |
45 | /* |
46 | * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members | |
47 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some | |
48 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt | |
49 | * | |
50 | * If (out side the lock) nfsd_serv is non-NULL, then it must point to a | |
51 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number | |
52 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each | |
53 | * entry of ->sv_pools[]. | |
54 | * | |
55 | * Transitions of the thread count between zero and non-zero are of particular | |
56 | * interest since the svc_serv needs to be created and initialized at that | |
57 | * point, or freed. | |
3dd98a3b JL |
58 | * |
59 | * Finally, the nfsd_mutex also protects some of the global variables that are | |
60 | * accessed when nfsd starts and that are settable via the write_* routines in | |
61 | * nfsctl.c. In particular: | |
62 | * | |
63 | * user_recovery_dirname | |
64 | * user_lease_time | |
65 | * nfsd_versions | |
bedbdd8b NB |
66 | */ |
67 | DEFINE_MUTEX(nfsd_mutex); | |
68 | struct svc_serv *nfsd_serv; | |
69 | ||
4bd9b0f4 AA |
70 | /* |
71 | * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used. | |
72 | * nfsd_drc_max_pages limits the total amount of memory available for | |
73 | * version 4.1 DRC caches. | |
74 | * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage. | |
75 | */ | |
76 | spinlock_t nfsd_drc_lock; | |
0c193054 AA |
77 | unsigned int nfsd_drc_max_mem; |
78 | unsigned int nfsd_drc_mem_used; | |
4bd9b0f4 | 79 | |
3fb803a9 AG |
80 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
81 | static struct svc_stat nfsd_acl_svcstats; | |
82 | static struct svc_version * nfsd_acl_version[] = { | |
83 | [2] = &nfsd_acl_version2, | |
84 | [3] = &nfsd_acl_version3, | |
85 | }; | |
86 | ||
87 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 88 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
89 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
90 | ||
91 | static struct svc_program nfsd_acl_program = { | |
92 | .pg_prog = NFS_ACL_PROGRAM, | |
93 | .pg_nvers = NFSD_ACL_NRVERS, | |
94 | .pg_vers = nfsd_acl_versions, | |
1a8eff6d | 95 | .pg_name = "nfsacl", |
3fb803a9 AG |
96 | .pg_class = "nfsd", |
97 | .pg_stats = &nfsd_acl_svcstats, | |
98 | .pg_authenticate = &svc_set_client, | |
99 | }; | |
100 | ||
101 | static struct svc_stat nfsd_acl_svcstats = { | |
102 | .program = &nfsd_acl_program, | |
103 | }; | |
104 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
105 | ||
70c3b76c N |
106 | static struct svc_version * nfsd_version[] = { |
107 | [2] = &nfsd_version2, | |
108 | #if defined(CONFIG_NFSD_V3) | |
109 | [3] = &nfsd_version3, | |
110 | #endif | |
111 | #if defined(CONFIG_NFSD_V4) | |
112 | [4] = &nfsd_version4, | |
113 | #endif | |
114 | }; | |
115 | ||
116 | #define NFSD_MINVERS 2 | |
e8c96f8c | 117 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
118 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
119 | ||
120 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
121 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
122 | .pg_next = &nfsd_acl_program, | |
123 | #endif | |
70c3b76c N |
124 | .pg_prog = NFS_PROGRAM, /* program number */ |
125 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
126 | .pg_vers = nfsd_versions, /* version table */ | |
127 | .pg_name = "nfsd", /* program name */ | |
128 | .pg_class = "nfsd", /* authentication class */ | |
129 | .pg_stats = &nfsd_svcstats, /* version table */ | |
130 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
131 | ||
132 | }; | |
133 | ||
8daf220a BH |
134 | u32 nfsd_supported_minorversion; |
135 | ||
6658d3a7 N |
136 | int nfsd_vers(int vers, enum vers_op change) |
137 | { | |
138 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
139 | return -1; | |
140 | switch(change) { | |
141 | case NFSD_SET: | |
142 | nfsd_versions[vers] = nfsd_version[vers]; | |
6658d3a7 N |
143 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
144 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 145 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
6658d3a7 | 146 | #endif |
1a8eff6d | 147 | break; |
6658d3a7 N |
148 | case NFSD_CLEAR: |
149 | nfsd_versions[vers] = NULL; | |
150 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
151 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 152 | nfsd_acl_versions[vers] = NULL; |
6658d3a7 N |
153 | #endif |
154 | break; | |
155 | case NFSD_TEST: | |
156 | return nfsd_versions[vers] != NULL; | |
157 | case NFSD_AVAIL: | |
158 | return nfsd_version[vers] != NULL; | |
159 | } | |
160 | return 0; | |
161 | } | |
8daf220a BH |
162 | |
163 | int nfsd_minorversion(u32 minorversion, enum vers_op change) | |
164 | { | |
165 | if (minorversion > NFSD_SUPPORTED_MINOR_VERSION) | |
166 | return -1; | |
167 | switch(change) { | |
168 | case NFSD_SET: | |
169 | nfsd_supported_minorversion = minorversion; | |
170 | break; | |
171 | case NFSD_CLEAR: | |
172 | if (minorversion == 0) | |
173 | return -1; | |
174 | nfsd_supported_minorversion = minorversion - 1; | |
175 | break; | |
176 | case NFSD_TEST: | |
177 | return minorversion <= nfsd_supported_minorversion; | |
178 | case NFSD_AVAIL: | |
179 | return minorversion <= NFSD_SUPPORTED_MINOR_VERSION; | |
180 | } | |
181 | return 0; | |
182 | } | |
183 | ||
1da177e4 LT |
184 | /* |
185 | * Maximum number of nfsd processes | |
186 | */ | |
187 | #define NFSD_MAXSERVS 8192 | |
188 | ||
189 | int nfsd_nrthreads(void) | |
190 | { | |
c7d106c9 NB |
191 | int rv = 0; |
192 | mutex_lock(&nfsd_mutex); | |
193 | if (nfsd_serv) | |
194 | rv = nfsd_serv->sv_nrthreads; | |
195 | mutex_unlock(&nfsd_mutex); | |
196 | return rv; | |
1da177e4 LT |
197 | } |
198 | ||
bc591ccf N |
199 | static void nfsd_last_thread(struct svc_serv *serv) |
200 | { | |
201 | /* When last nfsd thread exits we need to do some clean-up */ | |
7a182083 TT |
202 | struct svc_xprt *xprt; |
203 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) | |
24e36663 | 204 | lockd_down(); |
bc591ccf N |
205 | nfsd_serv = NULL; |
206 | nfsd_racache_shutdown(); | |
207 | nfs4_state_shutdown(); | |
208 | ||
e096bbc6 JL |
209 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
210 | "cache\n"); | |
211 | nfsd_export_flush(); | |
bc591ccf | 212 | } |
6658d3a7 N |
213 | |
214 | void nfsd_reset_versions(void) | |
215 | { | |
216 | int found_one = 0; | |
217 | int i; | |
218 | ||
219 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
220 | if (nfsd_program.pg_vers[i]) | |
221 | found_one = 1; | |
222 | } | |
223 | ||
224 | if (!found_one) { | |
225 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
226 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
227 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
228 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
229 | nfsd_acl_program.pg_vers[i] = | |
230 | nfsd_acl_version[i]; | |
231 | #endif | |
232 | } | |
233 | } | |
234 | ||
c3d06f9c AA |
235 | /* |
236 | * Each session guarantees a negotiated per slot memory cache for replies | |
237 | * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated | |
238 | * NFSv4.1 server might want to use more memory for a DRC than a machine | |
239 | * with mutiple services. | |
240 | * | |
241 | * Impose a hard limit on the number of pages for the DRC which varies | |
242 | * according to the machines free pages. This is of course only a default. | |
243 | * | |
244 | * For now this is a #defined shift which could be under admin control | |
245 | * in the future. | |
246 | */ | |
247 | static void set_max_drc(void) | |
248 | { | |
6a14dd1a | 249 | #define NFSD_DRC_SIZE_SHIFT 10 |
0c193054 AA |
250 | nfsd_drc_max_mem = (nr_free_buffer_pages() |
251 | >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; | |
252 | nfsd_drc_mem_used = 0; | |
4bd9b0f4 | 253 | spin_lock_init(&nfsd_drc_lock); |
0c193054 | 254 | dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem); |
c3d06f9c | 255 | } |
bedbdd8b | 256 | |
b41b66d6 | 257 | int nfsd_create_serv(void) |
02a375f0 N |
258 | { |
259 | int err = 0; | |
bedbdd8b NB |
260 | |
261 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); | |
02a375f0 | 262 | if (nfsd_serv) { |
9a24ab57 | 263 | svc_get(nfsd_serv); |
02a375f0 N |
264 | return 0; |
265 | } | |
596bbe53 N |
266 | if (nfsd_max_blksize == 0) { |
267 | /* choose a suitable default */ | |
268 | struct sysinfo i; | |
269 | si_meminfo(&i); | |
270 | /* Aim for 1/4096 of memory per thread | |
271 | * This gives 1MB on 4Gig machines | |
272 | * But only uses 32K on 128M machines. | |
273 | * Bottom out at 8K on 32M and smaller. | |
274 | * Of course, this is only a default. | |
275 | */ | |
276 | nfsd_max_blksize = NFSSVC_MAXBLKSIZE; | |
44c55600 | 277 | i.totalram <<= PAGE_SHIFT - 12; |
596bbe53 N |
278 | while (nfsd_max_blksize > i.totalram && |
279 | nfsd_max_blksize >= 8*1024*2) | |
280 | nfsd_max_blksize /= 2; | |
281 | } | |
02a375f0 | 282 | |
e096bbc6 | 283 | nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
a75c5d01 | 284 | nfsd_last_thread, nfsd, THIS_MODULE); |
02a375f0 N |
285 | if (nfsd_serv == NULL) |
286 | err = -ENOMEM; | |
c3d06f9c AA |
287 | else |
288 | set_max_drc(); | |
bedbdd8b | 289 | |
02a375f0 N |
290 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
291 | return err; | |
292 | } | |
293 | ||
294 | static int nfsd_init_socks(int port) | |
295 | { | |
296 | int error; | |
297 | if (!list_empty(&nfsd_serv->sv_permsocks)) | |
298 | return 0; | |
299 | ||
9652ada3 | 300 | error = svc_create_xprt(nfsd_serv, "udp", PF_INET, port, |
482fb94e | 301 | SVC_SOCK_DEFAULTS); |
02a375f0 N |
302 | if (error < 0) |
303 | return error; | |
304 | ||
1cd9cd16 CL |
305 | error = lockd_up(); |
306 | if (error < 0) | |
307 | return error; | |
308 | ||
9652ada3 | 309 | error = svc_create_xprt(nfsd_serv, "tcp", PF_INET, port, |
482fb94e | 310 | SVC_SOCK_DEFAULTS); |
02a375f0 N |
311 | if (error < 0) |
312 | return error; | |
26a41409 CL |
313 | |
314 | error = lockd_up(); | |
315 | if (error < 0) | |
316 | return error; | |
317 | ||
02a375f0 N |
318 | return 0; |
319 | } | |
320 | ||
eed2965a GB |
321 | int nfsd_nrpools(void) |
322 | { | |
323 | if (nfsd_serv == NULL) | |
324 | return 0; | |
325 | else | |
326 | return nfsd_serv->sv_nrpools; | |
327 | } | |
328 | ||
329 | int nfsd_get_nrthreads(int n, int *nthreads) | |
330 | { | |
331 | int i = 0; | |
332 | ||
333 | if (nfsd_serv != NULL) { | |
334 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) | |
335 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; | |
336 | } | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | int nfsd_set_nrthreads(int n, int *nthreads) | |
342 | { | |
343 | int i = 0; | |
344 | int tot = 0; | |
345 | int err = 0; | |
346 | ||
bedbdd8b NB |
347 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
348 | ||
eed2965a GB |
349 | if (nfsd_serv == NULL || n <= 0) |
350 | return 0; | |
351 | ||
352 | if (n > nfsd_serv->sv_nrpools) | |
353 | n = nfsd_serv->sv_nrpools; | |
354 | ||
355 | /* enforce a global maximum number of threads */ | |
356 | tot = 0; | |
357 | for (i = 0; i < n; i++) { | |
358 | if (nthreads[i] > NFSD_MAXSERVS) | |
359 | nthreads[i] = NFSD_MAXSERVS; | |
360 | tot += nthreads[i]; | |
361 | } | |
362 | if (tot > NFSD_MAXSERVS) { | |
363 | /* total too large: scale down requested numbers */ | |
364 | for (i = 0; i < n && tot > 0; i++) { | |
365 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
366 | tot -= (nthreads[i] - new); | |
367 | nthreads[i] = new; | |
368 | } | |
369 | for (i = 0; i < n && tot > 0; i++) { | |
370 | nthreads[i]--; | |
371 | tot--; | |
372 | } | |
373 | } | |
374 | ||
375 | /* | |
376 | * There must always be a thread in pool 0; the admin | |
377 | * can't shut down NFS completely using pool_threads. | |
378 | */ | |
379 | if (nthreads[0] == 0) | |
380 | nthreads[0] = 1; | |
381 | ||
382 | /* apply the new numbers */ | |
eed2965a GB |
383 | svc_get(nfsd_serv); |
384 | for (i = 0; i < n; i++) { | |
385 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], | |
386 | nthreads[i]); | |
387 | if (err) | |
388 | break; | |
389 | } | |
390 | svc_destroy(nfsd_serv); | |
eed2965a GB |
391 | |
392 | return err; | |
393 | } | |
394 | ||
1da177e4 LT |
395 | int |
396 | nfsd_svc(unsigned short port, int nrservs) | |
397 | { | |
398 | int error; | |
bedbdd8b NB |
399 | |
400 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 401 | dprintk("nfsd: creating service\n"); |
1da177e4 LT |
402 | if (nrservs <= 0) |
403 | nrservs = 0; | |
404 | if (nrservs > NFSD_MAXSERVS) | |
405 | nrservs = NFSD_MAXSERVS; | |
671e1fcf N |
406 | error = 0; |
407 | if (nrservs == 0 && nfsd_serv == NULL) | |
408 | goto out; | |
409 | ||
1da177e4 LT |
410 | /* Readahead param cache - will no-op if it already exists */ |
411 | error = nfsd_racache_init(2*nrservs); | |
412 | if (error<0) | |
413 | goto out; | |
29ab23cc BF |
414 | error = nfs4_state_start(); |
415 | if (error) | |
416 | goto out; | |
02a375f0 N |
417 | |
418 | nfsd_reset_versions(); | |
419 | ||
420 | error = nfsd_create_serv(); | |
421 | ||
422 | if (error) | |
423 | goto out; | |
424 | error = nfsd_init_socks(port); | |
425 | if (error) | |
426 | goto failure; | |
427 | ||
eec09661 | 428 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
82e12fe9 N |
429 | if (error == 0) |
430 | /* We are holding a reference to nfsd_serv which | |
431 | * we don't want to count in the return value, | |
432 | * so subtract 1 | |
433 | */ | |
434 | error = nfsd_serv->sv_nrthreads - 1; | |
1da177e4 | 435 | failure: |
1da177e4 | 436 | svc_destroy(nfsd_serv); /* Release server */ |
1da177e4 | 437 | out: |
bedbdd8b | 438 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
439 | return error; |
440 | } | |
441 | ||
1da177e4 LT |
442 | |
443 | /* | |
444 | * This is the NFS server kernel thread | |
445 | */ | |
9867d76c JL |
446 | static int |
447 | nfsd(void *vrqstp) | |
1da177e4 | 448 | { |
9867d76c | 449 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
9867d76c | 450 | int err, preverr = 0; |
1da177e4 LT |
451 | |
452 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 453 | mutex_lock(&nfsd_mutex); |
1da177e4 | 454 | |
9867d76c | 455 | /* At this point, the thread shares current->fs |
1da177e4 LT |
456 | * with the init process. We need to create files with a |
457 | * umask of 0 instead of init's umask. */ | |
3e93cd67 | 458 | if (unshare_fs_struct() < 0) { |
1da177e4 LT |
459 | printk("Unable to start nfsd thread: out of memory\n"); |
460 | goto out; | |
461 | } | |
3e93cd67 | 462 | |
1da177e4 LT |
463 | current->fs->umask = 0; |
464 | ||
9867d76c JL |
465 | /* |
466 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
100766f8 | 467 | * the ones that will bring down the thread |
9867d76c | 468 | */ |
100766f8 JL |
469 | allow_signal(SIGKILL); |
470 | allow_signal(SIGHUP); | |
471 | allow_signal(SIGINT); | |
472 | allow_signal(SIGQUIT); | |
bedbdd8b | 473 | |
1da177e4 | 474 | nfsdstats.th_cnt++; |
bedbdd8b NB |
475 | mutex_unlock(&nfsd_mutex); |
476 | ||
1da177e4 LT |
477 | /* |
478 | * We want less throttling in balance_dirty_pages() so that nfs to | |
479 | * localhost doesn't cause nfsd to lock up due to all the client's | |
480 | * dirty pages. | |
481 | */ | |
482 | current->flags |= PF_LESS_THROTTLE; | |
83144186 | 483 | set_freezable(); |
1da177e4 LT |
484 | |
485 | /* | |
486 | * The main request loop | |
487 | */ | |
488 | for (;;) { | |
1da177e4 LT |
489 | /* |
490 | * Find a socket with data available and call its | |
491 | * recvfrom routine. | |
492 | */ | |
6fb2b47f | 493 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 494 | ; |
9867d76c | 495 | if (err == -EINTR) |
1da177e4 | 496 | break; |
9867d76c JL |
497 | else if (err < 0) { |
498 | if (err != preverr) { | |
499 | printk(KERN_WARNING "%s: unexpected error " | |
500 | "from svc_recv (%d)\n", __func__, -err); | |
501 | preverr = err; | |
502 | } | |
503 | schedule_timeout_uninterruptible(HZ); | |
504 | continue; | |
505 | } | |
506 | ||
1da177e4 LT |
507 | |
508 | /* Lock the export hash tables for reading. */ | |
509 | exp_readlock(); | |
510 | ||
e0e81739 | 511 | validate_process_creds(); |
6fb2b47f | 512 | svc_process(rqstp); |
e0e81739 | 513 | validate_process_creds(); |
1da177e4 LT |
514 | |
515 | /* Unlock export hash tables */ | |
516 | exp_readunlock(); | |
1da177e4 LT |
517 | } |
518 | ||
24e36663 | 519 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 520 | flush_signals(current); |
1da177e4 | 521 | |
bedbdd8b | 522 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
523 | nfsdstats.th_cnt --; |
524 | ||
525 | out: | |
526 | /* Release the thread */ | |
527 | svc_exit_thread(rqstp); | |
528 | ||
529 | /* Release module */ | |
bedbdd8b | 530 | mutex_unlock(&nfsd_mutex); |
1da177e4 | 531 | module_put_and_exit(0); |
9867d76c | 532 | return 0; |
1da177e4 LT |
533 | } |
534 | ||
32c1eb0c AA |
535 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
536 | { | |
537 | if (nfserr == nfserr_jukebox && vers == 2) | |
538 | return nfserr_dropit; | |
539 | if (nfserr == nfserr_wrongsec && vers < 4) | |
540 | return nfserr_acces; | |
541 | return nfserr; | |
542 | } | |
543 | ||
1da177e4 | 544 | int |
c7afef1f | 545 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
546 | { |
547 | struct svc_procedure *proc; | |
548 | kxdrproc_t xdr; | |
ad451d38 AV |
549 | __be32 nfserr; |
550 | __be32 *nfserrp; | |
1da177e4 LT |
551 | |
552 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
553 | rqstp->rq_vers, rqstp->rq_proc); | |
554 | proc = rqstp->rq_procinfo; | |
555 | ||
556 | /* Check whether we have this call in the cache. */ | |
557 | switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) { | |
558 | case RC_INTR: | |
559 | case RC_DROPIT: | |
560 | return 0; | |
561 | case RC_REPLY: | |
562 | return 1; | |
563 | case RC_DOIT:; | |
564 | /* do it */ | |
565 | } | |
566 | ||
567 | /* Decode arguments */ | |
568 | xdr = proc->pc_decode; | |
ad451d38 | 569 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, |
1da177e4 LT |
570 | rqstp->rq_argp)) { |
571 | dprintk("nfsd: failed to decode arguments!\n"); | |
572 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
573 | *statp = rpc_garbage_args; | |
574 | return 1; | |
575 | } | |
576 | ||
577 | /* need to grab the location to store the status, as | |
578 | * nfsv4 does some encoding while processing | |
579 | */ | |
580 | nfserrp = rqstp->rq_res.head[0].iov_base | |
581 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 582 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
583 | |
584 | /* Now call the procedure handler, and encode NFS status. */ | |
585 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 586 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
1da177e4 | 587 | if (nfserr == nfserr_dropit) { |
45457e09 | 588 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
589 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
590 | return 0; | |
591 | } | |
592 | ||
593 | if (rqstp->rq_proc != 0) | |
594 | *nfserrp++ = nfserr; | |
595 | ||
596 | /* Encode result. | |
597 | * For NFSv2, additional info is never returned in case of an error. | |
598 | */ | |
599 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
600 | xdr = proc->pc_encode; | |
601 | if (xdr && !xdr(rqstp, nfserrp, | |
602 | rqstp->rq_resp)) { | |
603 | /* Failed to encode result. Release cache entry */ | |
604 | dprintk("nfsd: failed to encode result!\n"); | |
605 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
606 | *statp = rpc_system_err; | |
607 | return 1; | |
608 | } | |
609 | } | |
610 | ||
611 | /* Store reply in cache. */ | |
612 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); | |
613 | return 1; | |
614 | } | |
03cf6c9f GB |
615 | |
616 | int nfsd_pool_stats_open(struct inode *inode, struct file *file) | |
617 | { | |
ed2d8aed RY |
618 | int ret; |
619 | mutex_lock(&nfsd_mutex); | |
620 | if (nfsd_serv == NULL) { | |
621 | mutex_unlock(&nfsd_mutex); | |
03cf6c9f | 622 | return -ENODEV; |
ed2d8aed RY |
623 | } |
624 | /* bump up the psudo refcount while traversing */ | |
625 | svc_get(nfsd_serv); | |
626 | ret = svc_pool_stats_open(nfsd_serv, file); | |
627 | mutex_unlock(&nfsd_mutex); | |
628 | return ret; | |
629 | } | |
630 | ||
631 | int nfsd_pool_stats_release(struct inode *inode, struct file *file) | |
632 | { | |
633 | int ret = seq_release(inode, file); | |
634 | mutex_lock(&nfsd_mutex); | |
635 | /* this function really, really should have been called svc_put() */ | |
636 | svc_destroy(nfsd_serv); | |
637 | mutex_unlock(&nfsd_mutex); | |
638 | return ret; | |
03cf6c9f | 639 | } |