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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Central processing for nfsd. |
3 | * | |
4 | * Authors: Olaf Kirch (okir@monad.swb.de) | |
5 | * | |
6 | * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
e8edc6e0 | 9 | #include <linux/sched.h> |
83144186 | 10 | #include <linux/freezer.h> |
143cb494 | 11 | #include <linux/module.h> |
1da177e4 | 12 | #include <linux/fs_struct.h> |
c3d06f9c | 13 | #include <linux/swap.h> |
1da177e4 | 14 | |
1da177e4 | 15 | #include <linux/sunrpc/stats.h> |
1da177e4 | 16 | #include <linux/sunrpc/svcsock.h> |
1da177e4 | 17 | #include <linux/lockd/bind.h> |
a257cdd0 | 18 | #include <linux/nfsacl.h> |
ed2d8aed | 19 | #include <linux/seq_file.h> |
fc5d00b0 | 20 | #include <net/net_namespace.h> |
9a74af21 BH |
21 | #include "nfsd.h" |
22 | #include "cache.h" | |
0a3adade | 23 | #include "vfs.h" |
1da177e4 LT |
24 | |
25 | #define NFSDDBG_FACILITY NFSDDBG_SVC | |
26 | ||
1da177e4 | 27 | extern struct svc_program nfsd_program; |
9867d76c | 28 | static int nfsd(void *vrqstp); |
1da177e4 | 29 | struct timeval nfssvc_boot; |
1da177e4 | 30 | |
bedbdd8b NB |
31 | /* |
32 | * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members | |
33 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some | |
34 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt | |
35 | * | |
36 | * If (out side the lock) nfsd_serv is non-NULL, then it must point to a | |
37 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number | |
38 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each | |
39 | * entry of ->sv_pools[]. | |
40 | * | |
41 | * Transitions of the thread count between zero and non-zero are of particular | |
42 | * interest since the svc_serv needs to be created and initialized at that | |
43 | * point, or freed. | |
3dd98a3b JL |
44 | * |
45 | * Finally, the nfsd_mutex also protects some of the global variables that are | |
46 | * accessed when nfsd starts and that are settable via the write_* routines in | |
47 | * nfsctl.c. In particular: | |
48 | * | |
49 | * user_recovery_dirname | |
50 | * user_lease_time | |
51 | * nfsd_versions | |
bedbdd8b NB |
52 | */ |
53 | DEFINE_MUTEX(nfsd_mutex); | |
54 | struct svc_serv *nfsd_serv; | |
55 | ||
4bd9b0f4 AA |
56 | /* |
57 | * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used. | |
58 | * nfsd_drc_max_pages limits the total amount of memory available for | |
59 | * version 4.1 DRC caches. | |
60 | * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage. | |
61 | */ | |
62 | spinlock_t nfsd_drc_lock; | |
0c193054 AA |
63 | unsigned int nfsd_drc_max_mem; |
64 | unsigned int nfsd_drc_mem_used; | |
4bd9b0f4 | 65 | |
3fb803a9 AG |
66 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
67 | static struct svc_stat nfsd_acl_svcstats; | |
68 | static struct svc_version * nfsd_acl_version[] = { | |
69 | [2] = &nfsd_acl_version2, | |
70 | [3] = &nfsd_acl_version3, | |
71 | }; | |
72 | ||
73 | #define NFSD_ACL_MINVERS 2 | |
e8c96f8c | 74 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
3fb803a9 AG |
75 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
76 | ||
77 | static struct svc_program nfsd_acl_program = { | |
78 | .pg_prog = NFS_ACL_PROGRAM, | |
79 | .pg_nvers = NFSD_ACL_NRVERS, | |
80 | .pg_vers = nfsd_acl_versions, | |
1a8eff6d | 81 | .pg_name = "nfsacl", |
3fb803a9 AG |
82 | .pg_class = "nfsd", |
83 | .pg_stats = &nfsd_acl_svcstats, | |
84 | .pg_authenticate = &svc_set_client, | |
85 | }; | |
86 | ||
87 | static struct svc_stat nfsd_acl_svcstats = { | |
88 | .program = &nfsd_acl_program, | |
89 | }; | |
90 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ | |
91 | ||
70c3b76c N |
92 | static struct svc_version * nfsd_version[] = { |
93 | [2] = &nfsd_version2, | |
94 | #if defined(CONFIG_NFSD_V3) | |
95 | [3] = &nfsd_version3, | |
96 | #endif | |
97 | #if defined(CONFIG_NFSD_V4) | |
98 | [4] = &nfsd_version4, | |
99 | #endif | |
100 | }; | |
101 | ||
102 | #define NFSD_MINVERS 2 | |
e8c96f8c | 103 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
70c3b76c N |
104 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
105 | ||
106 | struct svc_program nfsd_program = { | |
3fb803a9 AG |
107 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
108 | .pg_next = &nfsd_acl_program, | |
109 | #endif | |
70c3b76c N |
110 | .pg_prog = NFS_PROGRAM, /* program number */ |
111 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ | |
112 | .pg_vers = nfsd_versions, /* version table */ | |
113 | .pg_name = "nfsd", /* program name */ | |
114 | .pg_class = "nfsd", /* authentication class */ | |
115 | .pg_stats = &nfsd_svcstats, /* version table */ | |
116 | .pg_authenticate = &svc_set_client, /* export authentication */ | |
117 | ||
118 | }; | |
119 | ||
8daf220a BH |
120 | u32 nfsd_supported_minorversion; |
121 | ||
6658d3a7 N |
122 | int nfsd_vers(int vers, enum vers_op change) |
123 | { | |
124 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) | |
15ddb4ae | 125 | return 0; |
6658d3a7 N |
126 | switch(change) { |
127 | case NFSD_SET: | |
128 | nfsd_versions[vers] = nfsd_version[vers]; | |
6658d3a7 N |
129 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
130 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 131 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
6658d3a7 | 132 | #endif |
1a8eff6d | 133 | break; |
6658d3a7 N |
134 | case NFSD_CLEAR: |
135 | nfsd_versions[vers] = NULL; | |
136 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
137 | if (vers < NFSD_ACL_NRVERS) | |
1a8eff6d | 138 | nfsd_acl_versions[vers] = NULL; |
6658d3a7 N |
139 | #endif |
140 | break; | |
141 | case NFSD_TEST: | |
142 | return nfsd_versions[vers] != NULL; | |
143 | case NFSD_AVAIL: | |
144 | return nfsd_version[vers] != NULL; | |
145 | } | |
146 | return 0; | |
147 | } | |
8daf220a BH |
148 | |
149 | int nfsd_minorversion(u32 minorversion, enum vers_op change) | |
150 | { | |
151 | if (minorversion > NFSD_SUPPORTED_MINOR_VERSION) | |
152 | return -1; | |
153 | switch(change) { | |
154 | case NFSD_SET: | |
155 | nfsd_supported_minorversion = minorversion; | |
156 | break; | |
157 | case NFSD_CLEAR: | |
158 | if (minorversion == 0) | |
159 | return -1; | |
160 | nfsd_supported_minorversion = minorversion - 1; | |
161 | break; | |
162 | case NFSD_TEST: | |
163 | return minorversion <= nfsd_supported_minorversion; | |
164 | case NFSD_AVAIL: | |
165 | return minorversion <= NFSD_SUPPORTED_MINOR_VERSION; | |
166 | } | |
167 | return 0; | |
168 | } | |
169 | ||
1da177e4 LT |
170 | /* |
171 | * Maximum number of nfsd processes | |
172 | */ | |
173 | #define NFSD_MAXSERVS 8192 | |
174 | ||
175 | int nfsd_nrthreads(void) | |
176 | { | |
c7d106c9 NB |
177 | int rv = 0; |
178 | mutex_lock(&nfsd_mutex); | |
179 | if (nfsd_serv) | |
180 | rv = nfsd_serv->sv_nrthreads; | |
181 | mutex_unlock(&nfsd_mutex); | |
182 | return rv; | |
1da177e4 LT |
183 | } |
184 | ||
db6e182c | 185 | static int nfsd_init_socks(struct net *net) |
59db4a0c BF |
186 | { |
187 | int error; | |
188 | if (!list_empty(&nfsd_serv->sv_permsocks)) | |
189 | return 0; | |
190 | ||
db6e182c | 191 | error = svc_create_xprt(nfsd_serv, "udp", net, PF_INET, NFS_PORT, |
59db4a0c BF |
192 | SVC_SOCK_DEFAULTS); |
193 | if (error < 0) | |
194 | return error; | |
195 | ||
db6e182c | 196 | error = svc_create_xprt(nfsd_serv, "tcp", net, PF_INET, NFS_PORT, |
59db4a0c BF |
197 | SVC_SOCK_DEFAULTS); |
198 | if (error < 0) | |
199 | return error; | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
4ad9a344 JL |
204 | static bool nfsd_up = false; |
205 | ||
db42d1a7 | 206 | static int nfsd_startup(int nrservs, struct net *net) |
4ad9a344 JL |
207 | { |
208 | int ret; | |
774f8bbd BF |
209 | |
210 | if (nfsd_up) | |
211 | return 0; | |
59db4a0c BF |
212 | /* |
213 | * Readahead param cache - will no-op if it already exists. | |
214 | * (Note therefore results will be suboptimal if number of | |
215 | * threads is modified after nfsd start.) | |
216 | */ | |
217 | ret = nfsd_racache_init(2*nrservs); | |
218 | if (ret) | |
219 | return ret; | |
db6e182c | 220 | ret = nfsd_init_socks(net); |
59db4a0c BF |
221 | if (ret) |
222 | goto out_racache; | |
f252bc68 | 223 | ret = lockd_up(net); |
ac77efbe | 224 | if (ret) |
774f8bbd | 225 | goto out_racache; |
4ad9a344 | 226 | ret = nfs4_state_start(); |
ac77efbe JL |
227 | if (ret) |
228 | goto out_lockd; | |
f252bc68 SK |
229 | |
230 | ret = nfs4_state_start_net(net); | |
231 | if (ret) | |
232 | goto out_net_state; | |
233 | ||
4ad9a344 | 234 | nfsd_up = true; |
ac77efbe | 235 | return 0; |
f252bc68 SK |
236 | out_net_state: |
237 | nfs4_state_shutdown(); | |
ac77efbe | 238 | out_lockd: |
db42d1a7 | 239 | lockd_down(net); |
59db4a0c BF |
240 | out_racache: |
241 | nfsd_racache_shutdown(); | |
4ad9a344 JL |
242 | return ret; |
243 | } | |
244 | ||
db42d1a7 | 245 | static void nfsd_shutdown(struct net *net) |
4ad9a344 JL |
246 | { |
247 | /* | |
248 | * write_ports can create the server without actually starting | |
249 | * any threads--if we get shut down before any threads are | |
250 | * started, then nfsd_last_thread will be run before any of this | |
251 | * other initialization has been done. | |
252 | */ | |
253 | if (!nfsd_up) | |
254 | return; | |
f252bc68 | 255 | nfs4_state_shutdown_net(net); |
4ad9a344 | 256 | nfs4_state_shutdown(); |
f252bc68 | 257 | lockd_down(net); |
59db4a0c | 258 | nfsd_racache_shutdown(); |
4ad9a344 JL |
259 | nfsd_up = false; |
260 | } | |
261 | ||
5ecebb7c | 262 | static void nfsd_last_thread(struct svc_serv *serv, struct net *net) |
bc591ccf | 263 | { |
db42d1a7 | 264 | nfsd_shutdown(net); |
bc591ccf | 265 | |
5ecebb7c | 266 | svc_rpcb_cleanup(serv, net); |
16d05870 | 267 | |
e096bbc6 JL |
268 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
269 | "cache\n"); | |
b3853e0e | 270 | nfsd_export_flush(net); |
bc591ccf | 271 | } |
6658d3a7 N |
272 | |
273 | void nfsd_reset_versions(void) | |
274 | { | |
275 | int found_one = 0; | |
276 | int i; | |
277 | ||
278 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { | |
279 | if (nfsd_program.pg_vers[i]) | |
280 | found_one = 1; | |
281 | } | |
282 | ||
283 | if (!found_one) { | |
284 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) | |
285 | nfsd_program.pg_vers[i] = nfsd_version[i]; | |
286 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
287 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) | |
288 | nfsd_acl_program.pg_vers[i] = | |
289 | nfsd_acl_version[i]; | |
290 | #endif | |
291 | } | |
292 | } | |
293 | ||
c3d06f9c AA |
294 | /* |
295 | * Each session guarantees a negotiated per slot memory cache for replies | |
296 | * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated | |
297 | * NFSv4.1 server might want to use more memory for a DRC than a machine | |
298 | * with mutiple services. | |
299 | * | |
300 | * Impose a hard limit on the number of pages for the DRC which varies | |
301 | * according to the machines free pages. This is of course only a default. | |
302 | * | |
303 | * For now this is a #defined shift which could be under admin control | |
304 | * in the future. | |
305 | */ | |
306 | static void set_max_drc(void) | |
307 | { | |
6a14dd1a | 308 | #define NFSD_DRC_SIZE_SHIFT 10 |
0c193054 AA |
309 | nfsd_drc_max_mem = (nr_free_buffer_pages() |
310 | >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; | |
311 | nfsd_drc_mem_used = 0; | |
4bd9b0f4 | 312 | spin_lock_init(&nfsd_drc_lock); |
0c193054 | 313 | dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem); |
c3d06f9c | 314 | } |
bedbdd8b | 315 | |
87b0fc7d | 316 | static int nfsd_get_default_max_blksize(void) |
02a375f0 | 317 | { |
87b0fc7d BF |
318 | struct sysinfo i; |
319 | unsigned long long target; | |
320 | unsigned long ret; | |
bedbdd8b | 321 | |
87b0fc7d | 322 | si_meminfo(&i); |
508f9227 | 323 | target = (i.totalram - i.totalhigh) << PAGE_SHIFT; |
87b0fc7d BF |
324 | /* |
325 | * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig | |
326 | * machines, but only uses 32K on 128M machines. Bottom out at | |
327 | * 8K on 32M and smaller. Of course, this is only a default. | |
328 | */ | |
329 | target >>= 12; | |
330 | ||
331 | ret = NFSSVC_MAXBLKSIZE; | |
332 | while (ret > target && ret >= 8*1024*2) | |
333 | ret /= 2; | |
334 | return ret; | |
335 | } | |
336 | ||
6777436b | 337 | int nfsd_create_serv(struct net *net) |
87b0fc7d | 338 | { |
9793f7c8 SK |
339 | int error; |
340 | ||
bedbdd8b | 341 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
02a375f0 | 342 | if (nfsd_serv) { |
9a24ab57 | 343 | svc_get(nfsd_serv); |
02a375f0 N |
344 | return 0; |
345 | } | |
87b0fc7d BF |
346 | if (nfsd_max_blksize == 0) |
347 | nfsd_max_blksize = nfsd_get_default_max_blksize(); | |
e844a7b9 | 348 | nfsd_reset_versions(); |
e096bbc6 | 349 | nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
a75c5d01 | 350 | nfsd_last_thread, nfsd, THIS_MODULE); |
02a375f0 | 351 | if (nfsd_serv == NULL) |
628b3687 | 352 | return -ENOMEM; |
bedbdd8b | 353 | |
57c8b13e | 354 | error = svc_bind(nfsd_serv, net); |
9793f7c8 SK |
355 | if (error < 0) { |
356 | svc_destroy(nfsd_serv); | |
357 | return error; | |
358 | } | |
359 | ||
628b3687 | 360 | set_max_drc(); |
02a375f0 | 361 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
87b0fc7d | 362 | return 0; |
02a375f0 N |
363 | } |
364 | ||
eed2965a GB |
365 | int nfsd_nrpools(void) |
366 | { | |
367 | if (nfsd_serv == NULL) | |
368 | return 0; | |
369 | else | |
370 | return nfsd_serv->sv_nrpools; | |
371 | } | |
372 | ||
373 | int nfsd_get_nrthreads(int n, int *nthreads) | |
374 | { | |
375 | int i = 0; | |
376 | ||
377 | if (nfsd_serv != NULL) { | |
378 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) | |
379 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; | |
380 | } | |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
3938a0d5 | 385 | int nfsd_set_nrthreads(int n, int *nthreads, struct net *net) |
eed2965a GB |
386 | { |
387 | int i = 0; | |
388 | int tot = 0; | |
389 | int err = 0; | |
390 | ||
bedbdd8b NB |
391 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
392 | ||
eed2965a GB |
393 | if (nfsd_serv == NULL || n <= 0) |
394 | return 0; | |
395 | ||
396 | if (n > nfsd_serv->sv_nrpools) | |
397 | n = nfsd_serv->sv_nrpools; | |
398 | ||
399 | /* enforce a global maximum number of threads */ | |
400 | tot = 0; | |
401 | for (i = 0; i < n; i++) { | |
402 | if (nthreads[i] > NFSD_MAXSERVS) | |
403 | nthreads[i] = NFSD_MAXSERVS; | |
404 | tot += nthreads[i]; | |
405 | } | |
406 | if (tot > NFSD_MAXSERVS) { | |
407 | /* total too large: scale down requested numbers */ | |
408 | for (i = 0; i < n && tot > 0; i++) { | |
409 | int new = nthreads[i] * NFSD_MAXSERVS / tot; | |
410 | tot -= (nthreads[i] - new); | |
411 | nthreads[i] = new; | |
412 | } | |
413 | for (i = 0; i < n && tot > 0; i++) { | |
414 | nthreads[i]--; | |
415 | tot--; | |
416 | } | |
417 | } | |
418 | ||
419 | /* | |
420 | * There must always be a thread in pool 0; the admin | |
421 | * can't shut down NFS completely using pool_threads. | |
422 | */ | |
423 | if (nthreads[0] == 0) | |
424 | nthreads[0] = 1; | |
425 | ||
426 | /* apply the new numbers */ | |
eed2965a GB |
427 | svc_get(nfsd_serv); |
428 | for (i = 0; i < n; i++) { | |
429 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], | |
430 | nthreads[i]); | |
431 | if (err) | |
432 | break; | |
433 | } | |
19f7e2ca | 434 | nfsd_destroy(net); |
eed2965a GB |
435 | return err; |
436 | } | |
437 | ||
ac77efbe JL |
438 | /* |
439 | * Adjust the number of threads and return the new number of threads. | |
440 | * This is also the function that starts the server if necessary, if | |
441 | * this is the first time nrservs is nonzero. | |
442 | */ | |
1da177e4 | 443 | int |
d41a9417 | 444 | nfsd_svc(int nrservs, struct net *net) |
1da177e4 LT |
445 | { |
446 | int error; | |
774f8bbd | 447 | bool nfsd_up_before; |
bedbdd8b NB |
448 | |
449 | mutex_lock(&nfsd_mutex); | |
6658d3a7 | 450 | dprintk("nfsd: creating service\n"); |
1da177e4 LT |
451 | if (nrservs <= 0) |
452 | nrservs = 0; | |
453 | if (nrservs > NFSD_MAXSERVS) | |
454 | nrservs = NFSD_MAXSERVS; | |
671e1fcf N |
455 | error = 0; |
456 | if (nrservs == 0 && nfsd_serv == NULL) | |
457 | goto out; | |
458 | ||
6777436b | 459 | error = nfsd_create_serv(net); |
02a375f0 | 460 | if (error) |
774f8bbd BF |
461 | goto out; |
462 | ||
463 | nfsd_up_before = nfsd_up; | |
464 | ||
db42d1a7 | 465 | error = nfsd_startup(nrservs, net); |
af4718f3 BF |
466 | if (error) |
467 | goto out_destroy; | |
774f8bbd BF |
468 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
469 | if (error) | |
470 | goto out_shutdown; | |
af4718f3 BF |
471 | /* We are holding a reference to nfsd_serv which |
472 | * we don't want to count in the return value, | |
473 | * so subtract 1 | |
474 | */ | |
475 | error = nfsd_serv->sv_nrthreads - 1; | |
4ad9a344 | 476 | out_shutdown: |
774f8bbd | 477 | if (error < 0 && !nfsd_up_before) |
db42d1a7 | 478 | nfsd_shutdown(net); |
774f8bbd | 479 | out_destroy: |
19f7e2ca | 480 | nfsd_destroy(net); /* Release server */ |
4ad9a344 | 481 | out: |
bedbdd8b | 482 | mutex_unlock(&nfsd_mutex); |
1da177e4 LT |
483 | return error; |
484 | } | |
485 | ||
1da177e4 LT |
486 | |
487 | /* | |
488 | * This is the NFS server kernel thread | |
489 | */ | |
9867d76c JL |
490 | static int |
491 | nfsd(void *vrqstp) | |
1da177e4 | 492 | { |
9867d76c | 493 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
5b444cc9 | 494 | int err; |
1da177e4 LT |
495 | |
496 | /* Lock module and set up kernel thread */ | |
bedbdd8b | 497 | mutex_lock(&nfsd_mutex); |
1da177e4 | 498 | |
9867d76c | 499 | /* At this point, the thread shares current->fs |
1da177e4 LT |
500 | * with the init process. We need to create files with a |
501 | * umask of 0 instead of init's umask. */ | |
3e93cd67 | 502 | if (unshare_fs_struct() < 0) { |
1da177e4 LT |
503 | printk("Unable to start nfsd thread: out of memory\n"); |
504 | goto out; | |
505 | } | |
3e93cd67 | 506 | |
1da177e4 LT |
507 | current->fs->umask = 0; |
508 | ||
9867d76c JL |
509 | /* |
510 | * thread is spawned with all signals set to SIG_IGN, re-enable | |
100766f8 | 511 | * the ones that will bring down the thread |
9867d76c | 512 | */ |
100766f8 JL |
513 | allow_signal(SIGKILL); |
514 | allow_signal(SIGHUP); | |
515 | allow_signal(SIGINT); | |
516 | allow_signal(SIGQUIT); | |
bedbdd8b | 517 | |
1da177e4 | 518 | nfsdstats.th_cnt++; |
bedbdd8b NB |
519 | mutex_unlock(&nfsd_mutex); |
520 | ||
1da177e4 LT |
521 | /* |
522 | * We want less throttling in balance_dirty_pages() so that nfs to | |
523 | * localhost doesn't cause nfsd to lock up due to all the client's | |
524 | * dirty pages. | |
525 | */ | |
526 | current->flags |= PF_LESS_THROTTLE; | |
83144186 | 527 | set_freezable(); |
1da177e4 LT |
528 | |
529 | /* | |
530 | * The main request loop | |
531 | */ | |
532 | for (;;) { | |
1da177e4 LT |
533 | /* |
534 | * Find a socket with data available and call its | |
535 | * recvfrom routine. | |
536 | */ | |
6fb2b47f | 537 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
1da177e4 | 538 | ; |
9867d76c | 539 | if (err == -EINTR) |
1da177e4 | 540 | break; |
e0e81739 | 541 | validate_process_creds(); |
6fb2b47f | 542 | svc_process(rqstp); |
e0e81739 | 543 | validate_process_creds(); |
1da177e4 LT |
544 | } |
545 | ||
24e36663 | 546 | /* Clear signals before calling svc_exit_thread() */ |
9e416052 | 547 | flush_signals(current); |
1da177e4 | 548 | |
bedbdd8b | 549 | mutex_lock(&nfsd_mutex); |
1da177e4 LT |
550 | nfsdstats.th_cnt --; |
551 | ||
552 | out: | |
57c8b13e | 553 | rqstp->rq_server = NULL; |
786185b5 | 554 | |
1da177e4 LT |
555 | /* Release the thread */ |
556 | svc_exit_thread(rqstp); | |
557 | ||
57c8b13e SK |
558 | nfsd_destroy(&init_net); |
559 | ||
1da177e4 | 560 | /* Release module */ |
bedbdd8b | 561 | mutex_unlock(&nfsd_mutex); |
1da177e4 | 562 | module_put_and_exit(0); |
9867d76c | 563 | return 0; |
1da177e4 LT |
564 | } |
565 | ||
32c1eb0c AA |
566 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
567 | { | |
568 | if (nfserr == nfserr_jukebox && vers == 2) | |
569 | return nfserr_dropit; | |
570 | if (nfserr == nfserr_wrongsec && vers < 4) | |
571 | return nfserr_acces; | |
572 | return nfserr; | |
573 | } | |
574 | ||
1da177e4 | 575 | int |
c7afef1f | 576 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
1da177e4 LT |
577 | { |
578 | struct svc_procedure *proc; | |
579 | kxdrproc_t xdr; | |
ad451d38 AV |
580 | __be32 nfserr; |
581 | __be32 *nfserrp; | |
1da177e4 LT |
582 | |
583 | dprintk("nfsd_dispatch: vers %d proc %d\n", | |
584 | rqstp->rq_vers, rqstp->rq_proc); | |
585 | proc = rqstp->rq_procinfo; | |
586 | ||
1091006c BF |
587 | /* |
588 | * Give the xdr decoder a chance to change this if it wants | |
589 | * (necessary in the NFSv4.0 compound case) | |
590 | */ | |
591 | rqstp->rq_cachetype = proc->pc_cachetype; | |
592 | /* Decode arguments */ | |
593 | xdr = proc->pc_decode; | |
594 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, | |
595 | rqstp->rq_argp)) { | |
596 | dprintk("nfsd: failed to decode arguments!\n"); | |
597 | *statp = rpc_garbage_args; | |
598 | return 1; | |
599 | } | |
600 | ||
1da177e4 | 601 | /* Check whether we have this call in the cache. */ |
1091006c | 602 | switch (nfsd_cache_lookup(rqstp)) { |
1da177e4 LT |
603 | case RC_INTR: |
604 | case RC_DROPIT: | |
605 | return 0; | |
606 | case RC_REPLY: | |
607 | return 1; | |
608 | case RC_DOIT:; | |
609 | /* do it */ | |
610 | } | |
611 | ||
1da177e4 LT |
612 | /* need to grab the location to store the status, as |
613 | * nfsv4 does some encoding while processing | |
614 | */ | |
615 | nfserrp = rqstp->rq_res.head[0].iov_base | |
616 | + rqstp->rq_res.head[0].iov_len; | |
ad451d38 | 617 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
1da177e4 LT |
618 | |
619 | /* Now call the procedure handler, and encode NFS status. */ | |
620 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); | |
32c1eb0c | 621 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
9e701c61 | 622 | if (nfserr == nfserr_dropit || rqstp->rq_dropme) { |
45457e09 | 623 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
1da177e4 LT |
624 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
625 | return 0; | |
626 | } | |
627 | ||
628 | if (rqstp->rq_proc != 0) | |
629 | *nfserrp++ = nfserr; | |
630 | ||
631 | /* Encode result. | |
632 | * For NFSv2, additional info is never returned in case of an error. | |
633 | */ | |
634 | if (!(nfserr && rqstp->rq_vers == 2)) { | |
635 | xdr = proc->pc_encode; | |
636 | if (xdr && !xdr(rqstp, nfserrp, | |
637 | rqstp->rq_resp)) { | |
638 | /* Failed to encode result. Release cache entry */ | |
639 | dprintk("nfsd: failed to encode result!\n"); | |
640 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); | |
641 | *statp = rpc_system_err; | |
642 | return 1; | |
643 | } | |
644 | } | |
645 | ||
646 | /* Store reply in cache. */ | |
57d276d7 | 647 | nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1); |
1da177e4 LT |
648 | return 1; |
649 | } | |
03cf6c9f GB |
650 | |
651 | int nfsd_pool_stats_open(struct inode *inode, struct file *file) | |
652 | { | |
ed2d8aed RY |
653 | int ret; |
654 | mutex_lock(&nfsd_mutex); | |
655 | if (nfsd_serv == NULL) { | |
656 | mutex_unlock(&nfsd_mutex); | |
03cf6c9f | 657 | return -ENODEV; |
ed2d8aed RY |
658 | } |
659 | /* bump up the psudo refcount while traversing */ | |
660 | svc_get(nfsd_serv); | |
661 | ret = svc_pool_stats_open(nfsd_serv, file); | |
662 | mutex_unlock(&nfsd_mutex); | |
663 | return ret; | |
664 | } | |
665 | ||
666 | int nfsd_pool_stats_release(struct inode *inode, struct file *file) | |
667 | { | |
668 | int ret = seq_release(inode, file); | |
786185b5 SK |
669 | struct net *net = &init_net; |
670 | ||
ed2d8aed RY |
671 | mutex_lock(&nfsd_mutex); |
672 | /* this function really, really should have been called svc_put() */ | |
19f7e2ca | 673 | nfsd_destroy(net); |
ed2d8aed RY |
674 | mutex_unlock(&nfsd_mutex); |
675 | return ret; | |
03cf6c9f | 676 | } |