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[PARISC] Add sync required after fdc to enforce insn ordering
[linux-2.6.22.y-op.git] / fs / lockd / svc4proc.c
blob489670e21769a0de6b8635660b73ef909b5bd927
1 /*
2 * linux/fs/lockd/svc4proc.c
3 *
4 * Lockd server procedures. We don't implement the NLM_*_RES
5 * procedures because we don't use the async procedures.
6 *
7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
8 */
9
10 #include <linux/types.h>
11 #include <linux/time.h>
12 #include <linux/slab.h>
13 #include <linux/in.h>
14 #include <linux/sunrpc/svc.h>
15 #include <linux/sunrpc/clnt.h>
16 #include <linux/nfsd/nfsd.h>
17 #include <linux/lockd/lockd.h>
18 #include <linux/lockd/share.h>
19 #include <linux/lockd/sm_inter.h>
20
21
22 #define NLMDBG_FACILITY NLMDBG_CLIENT
23
24 static u32 nlm4svc_callback(struct svc_rqst *, u32, struct nlm_res *);
25 static void nlm4svc_callback_exit(struct rpc_task *);
26
27 /*
28 * Obtain client and file from arguments
29 */
30 static u32
31 nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
32 struct nlm_host **hostp, struct nlm_file **filp)
33 {
34 struct nlm_host *host = NULL;
35 struct nlm_file *file = NULL;
36 struct nlm_lock *lock = &argp->lock;
37 u32 error = 0;
38
39 /* nfsd callbacks must have been installed for this procedure */
40 if (!nlmsvc_ops)
41 return nlm_lck_denied_nolocks;
42
43 /* Obtain host handle */
44 if (!(host = nlmsvc_lookup_host(rqstp))
45 || (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0))
46 goto no_locks;
47 *hostp = host;
48
49 /* Obtain file pointer. Not used by FREE_ALL call. */
50 if (filp != NULL) {
51 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
52 goto no_locks;
53 *filp = file;
54
55 /* Set up the missing parts of the file_lock structure */
56 lock->fl.fl_file = file->f_file;
57 lock->fl.fl_owner = (fl_owner_t) host;
58 lock->fl.fl_lmops = &nlmsvc_lock_operations;
59 }
60
61 return 0;
62
63 no_locks:
64 if (host)
65 nlm_release_host(host);
66 if (error)
67 return error;
68 return nlm_lck_denied_nolocks;
69 }
70
71 /*
72 * NULL: Test for presence of service
73 */
74 static int
75 nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
76 {
77 dprintk("lockd: NULL called\n");
78 return rpc_success;
79 }
80
81 /*
82 * TEST: Check for conflicting lock
83 */
84 static int
85 nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
86 struct nlm_res *resp)
87 {
88 struct nlm_host *host;
89 struct nlm_file *file;
90
91 dprintk("lockd: TEST4 called\n");
92 resp->cookie = argp->cookie;
93
94 /* Don't accept test requests during grace period */
95 if (nlmsvc_grace_period) {
96 resp->status = nlm_lck_denied_grace_period;
97 return rpc_success;
98 }
99
100 /* Obtain client and file */
101 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
102 return rpc_success;
103
104 /* Now check for conflicting locks */
105 resp->status = nlmsvc_testlock(file, &argp->lock, &resp->lock);
106
107 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
108 nlm_release_host(host);
109 nlm_release_file(file);
110 return rpc_success;
111 }
112
113 static int
114 nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
115 struct nlm_res *resp)
116 {
117 struct nlm_host *host;
118 struct nlm_file *file;
119
120 dprintk("lockd: LOCK called\n");
121
122 resp->cookie = argp->cookie;
123
124 /* Don't accept new lock requests during grace period */
125 if (nlmsvc_grace_period && !argp->reclaim) {
126 resp->status = nlm_lck_denied_grace_period;
127 return rpc_success;
128 }
129
130 /* Obtain client and file */
131 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
132 return rpc_success;
133
134 #if 0
135 /* If supplied state doesn't match current state, we assume it's
136 * an old request that time-warped somehow. Any error return would
137 * do in this case because it's irrelevant anyway.
138 *
139 * NB: We don't retrieve the remote host's state yet.
140 */
141 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
142 resp->status = nlm_lck_denied_nolocks;
143 } else
144 #endif
145
146 /* Now try to lock the file */
147 resp->status = nlmsvc_lock(rqstp, file, &argp->lock,
148 argp->block, &argp->cookie);
149
150 dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
151 nlm_release_host(host);
152 nlm_release_file(file);
153 return rpc_success;
154 }
155
156 static int
157 nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
158 struct nlm_res *resp)
159 {
160 struct nlm_host *host;
161 struct nlm_file *file;
162
163 dprintk("lockd: CANCEL called\n");
164
165 resp->cookie = argp->cookie;
166
167 /* Don't accept requests during grace period */
168 if (nlmsvc_grace_period) {
169 resp->status = nlm_lck_denied_grace_period;
170 return rpc_success;
171 }
172
173 /* Obtain client and file */
174 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
175 return rpc_success;
176
177 /* Try to cancel request. */
178 resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
179
180 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
181 nlm_release_host(host);
182 nlm_release_file(file);
183 return rpc_success;
184 }
185
186 /*
187 * UNLOCK: release a lock
188 */
189 static int
190 nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
191 struct nlm_res *resp)
192 {
193 struct nlm_host *host;
194 struct nlm_file *file;
195
196 dprintk("lockd: UNLOCK called\n");
197
198 resp->cookie = argp->cookie;
199
200 /* Don't accept new lock requests during grace period */
201 if (nlmsvc_grace_period) {
202 resp->status = nlm_lck_denied_grace_period;
203 return rpc_success;
204 }
205
206 /* Obtain client and file */
207 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
208 return rpc_success;
209
210 /* Now try to remove the lock */
211 resp->status = nlmsvc_unlock(file, &argp->lock);
212
213 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
214 nlm_release_host(host);
215 nlm_release_file(file);
216 return rpc_success;
217 }
218
219 /*
220 * GRANTED: A server calls us to tell that a process' lock request
221 * was granted
222 */
223 static int
224 nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
225 struct nlm_res *resp)
226 {
227 resp->cookie = argp->cookie;
228
229 dprintk("lockd: GRANTED called\n");
230 resp->status = nlmclnt_grant(&argp->lock);
231 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
232 return rpc_success;
233 }
234
235 /*
236 * `Async' versions of the above service routines. They aren't really,
237 * because we send the callback before the reply proper. I hope this
238 * doesn't break any clients.
239 */
240 static int
241 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
242 void *resp)
243 {
244 struct nlm_res res;
245 u32 stat;
246
247 dprintk("lockd: TEST_MSG called\n");
248 memset(&res, 0, sizeof(res));
249
250 if ((stat = nlm4svc_proc_test(rqstp, argp, &res)) == 0)
251 stat = nlm4svc_callback(rqstp, NLMPROC_TEST_RES, &res);
252 return stat;
253 }
254
255 static int
256 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
257 void *resp)
258 {
259 struct nlm_res res;
260 u32 stat;
261
262 dprintk("lockd: LOCK_MSG called\n");
263 memset(&res, 0, sizeof(res));
264
265 if ((stat = nlm4svc_proc_lock(rqstp, argp, &res)) == 0)
266 stat = nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, &res);
267 return stat;
268 }
269
270 static int
271 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
272 void *resp)
273 {
274 struct nlm_res res;
275 u32 stat;
276
277 dprintk("lockd: CANCEL_MSG called\n");
278 memset(&res, 0, sizeof(res));
279
280 if ((stat = nlm4svc_proc_cancel(rqstp, argp, &res)) == 0)
281 stat = nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, &res);
282 return stat;
283 }
284
285 static int
286 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
287 void *resp)
288 {
289 struct nlm_res res;
290 u32 stat;
291
292 dprintk("lockd: UNLOCK_MSG called\n");
293 memset(&res, 0, sizeof(res));
294
295 if ((stat = nlm4svc_proc_unlock(rqstp, argp, &res)) == 0)
296 stat = nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, &res);
297 return stat;
298 }
299
300 static int
301 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
302 void *resp)
303 {
304 struct nlm_res res;
305 u32 stat;
306
307 dprintk("lockd: GRANTED_MSG called\n");
308 memset(&res, 0, sizeof(res));
309
310 if ((stat = nlm4svc_proc_granted(rqstp, argp, &res)) == 0)
311 stat = nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, &res);
312 return stat;
313 }
314
315 /*
316 * SHARE: create a DOS share or alter existing share.
317 */
318 static int
319 nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
320 struct nlm_res *resp)
321 {
322 struct nlm_host *host;
323 struct nlm_file *file;
324
325 dprintk("lockd: SHARE called\n");
326
327 resp->cookie = argp->cookie;
328
329 /* Don't accept new lock requests during grace period */
330 if (nlmsvc_grace_period && !argp->reclaim) {
331 resp->status = nlm_lck_denied_grace_period;
332 return rpc_success;
333 }
334
335 /* Obtain client and file */
336 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
337 return rpc_success;
338
339 /* Now try to create the share */
340 resp->status = nlmsvc_share_file(host, file, argp);
341
342 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
343 nlm_release_host(host);
344 nlm_release_file(file);
345 return rpc_success;
346 }
347
348 /*
349 * UNSHARE: Release a DOS share.
350 */
351 static int
352 nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
353 struct nlm_res *resp)
354 {
355 struct nlm_host *host;
356 struct nlm_file *file;
357
358 dprintk("lockd: UNSHARE called\n");
359
360 resp->cookie = argp->cookie;
361
362 /* Don't accept requests during grace period */
363 if (nlmsvc_grace_period) {
364 resp->status = nlm_lck_denied_grace_period;
365 return rpc_success;
366 }
367
368 /* Obtain client and file */
369 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
370 return rpc_success;
371
372 /* Now try to lock the file */
373 resp->status = nlmsvc_unshare_file(host, file, argp);
374
375 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
376 nlm_release_host(host);
377 nlm_release_file(file);
378 return rpc_success;
379 }
380
381 /*
382 * NM_LOCK: Create an unmonitored lock
383 */
384 static int
385 nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
386 struct nlm_res *resp)
387 {
388 dprintk("lockd: NM_LOCK called\n");
389
390 argp->monitor = 0; /* just clean the monitor flag */
391 return nlm4svc_proc_lock(rqstp, argp, resp);
392 }
393
394 /*
395 * FREE_ALL: Release all locks and shares held by client
396 */
397 static int
398 nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
399 void *resp)
400 {
401 struct nlm_host *host;
402
403 /* Obtain client */
404 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
405 return rpc_success;
406
407 nlmsvc_free_host_resources(host);
408 nlm_release_host(host);
409 return rpc_success;
410 }
411
412 /*
413 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
414 */
415 static int
416 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
417 void *resp)
418 {
419 struct sockaddr_in saddr = rqstp->rq_addr;
420 int vers = argp->vers;
421 int prot = argp->proto >> 1;
422
423 struct nlm_host *host;
424
425 dprintk("lockd: SM_NOTIFY called\n");
426 if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
427 || ntohs(saddr.sin_port) >= 1024) {
428 printk(KERN_WARNING
429 "lockd: rejected NSM callback from %08x:%d\n",
430 ntohl(rqstp->rq_addr.sin_addr.s_addr),
431 ntohs(rqstp->rq_addr.sin_port));
432 return rpc_system_err;
433 }
434
435 /* Obtain the host pointer for this NFS server and try to
436 * reclaim all locks we hold on this server.
437 */
438 saddr.sin_addr.s_addr = argp->addr;
439
440 if ((argp->proto & 1)==0) {
441 if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) {
442 nlmclnt_recovery(host, argp->state);
443 nlm_release_host(host);
444 }
445 } else {
446 /* If we run on an NFS server, delete all locks held by the client */
447
448 if ((host = nlm_lookup_host(1, &saddr, prot, vers)) != NULL) {
449 nlmsvc_free_host_resources(host);
450 nlm_release_host(host);
451 }
452 }
453 return rpc_success;
454 }
455
456 /*
457 * client sent a GRANTED_RES, let's remove the associated block
458 */
459 static int
460 nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp,
461 void *resp)
462 {
463 if (!nlmsvc_ops)
464 return rpc_success;
465
466 dprintk("lockd: GRANTED_RES called\n");
467
468 nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status);
469 return rpc_success;
470 }
471
472
473
474 /*
475 * This is the generic lockd callback for async RPC calls
476 */
477 static u32
478 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_res *resp)
479 {
480 struct nlm_host *host;
481 struct nlm_rqst *call;
482
483 if (!(call = nlmclnt_alloc_call()))
484 return rpc_system_err;
485
486 host = nlmclnt_lookup_host(&rqstp->rq_addr,
487 rqstp->rq_prot, rqstp->rq_vers);
488 if (!host) {
489 kfree(call);
490 return rpc_system_err;
491 }
492
493 call->a_flags = RPC_TASK_ASYNC;
494 call->a_host = host;
495 memcpy(&call->a_args, resp, sizeof(*resp));
496
497 if (nlmsvc_async_call(call, proc, nlm4svc_callback_exit) < 0)
498 goto error;
499
500 return rpc_success;
501 error:
502 kfree(call);
503 nlm_release_host(host);
504 return rpc_system_err;
505 }
506
507 static void
508 nlm4svc_callback_exit(struct rpc_task *task)
509 {
510 struct nlm_rqst *call = (struct nlm_rqst *) task->tk_calldata;
511
512 if (task->tk_status < 0) {
513 dprintk("lockd: %4d callback failed (errno = %d)\n",
514 task->tk_pid, -task->tk_status);
515 }
516 nlm_release_host(call->a_host);
517 kfree(call);
518 }
519
520 /*
521 * NLM Server procedures.
522 */
523
524 #define nlm4svc_encode_norep nlm4svc_encode_void
525 #define nlm4svc_decode_norep nlm4svc_decode_void
526 #define nlm4svc_decode_testres nlm4svc_decode_void
527 #define nlm4svc_decode_lockres nlm4svc_decode_void
528 #define nlm4svc_decode_unlockres nlm4svc_decode_void
529 #define nlm4svc_decode_cancelres nlm4svc_decode_void
530 #define nlm4svc_decode_grantedres nlm4svc_decode_void
531
532 #define nlm4svc_proc_none nlm4svc_proc_null
533 #define nlm4svc_proc_test_res nlm4svc_proc_null
534 #define nlm4svc_proc_lock_res nlm4svc_proc_null
535 #define nlm4svc_proc_cancel_res nlm4svc_proc_null
536 #define nlm4svc_proc_unlock_res nlm4svc_proc_null
537
538 struct nlm_void { int dummy; };
539
540 #define PROC(name, xargt, xrest, argt, rest, respsize) \
541 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
542 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
543 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
544 .pc_release = NULL, \
545 .pc_argsize = sizeof(struct nlm_##argt), \
546 .pc_ressize = sizeof(struct nlm_##rest), \
547 .pc_xdrressize = respsize, \
548 }
549 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
550 #define No (1+1024/4) /* netobj */
551 #define St 1 /* status */
552 #define Rg 4 /* range (offset + length) */
553 struct svc_procedure nlmsvc_procedures4[] = {
554 PROC(null, void, void, void, void, 1),
555 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
556 PROC(lock, lockargs, res, args, res, Ck+St),
557 PROC(cancel, cancargs, res, args, res, Ck+St),
558 PROC(unlock, unlockargs, res, args, res, Ck+St),
559 PROC(granted, testargs, res, args, res, Ck+St),
560 PROC(test_msg, testargs, norep, args, void, 1),
561 PROC(lock_msg, lockargs, norep, args, void, 1),
562 PROC(cancel_msg, cancargs, norep, args, void, 1),
563 PROC(unlock_msg, unlockargs, norep, args, void, 1),
564 PROC(granted_msg, testargs, norep, args, void, 1),
565 PROC(test_res, testres, norep, res, void, 1),
566 PROC(lock_res, lockres, norep, res, void, 1),
567 PROC(cancel_res, cancelres, norep, res, void, 1),
568 PROC(unlock_res, unlockres, norep, res, void, 1),
569 PROC(granted_res, res, norep, res, void, 1),
570 /* statd callback */
571 PROC(sm_notify, reboot, void, reboot, void, 1),
572 PROC(none, void, void, void, void, 0),
573 PROC(none, void, void, void, void, 0),
574 PROC(none, void, void, void, void, 0),
575 PROC(share, shareargs, shareres, args, res, Ck+St+1),
576 PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
577 PROC(nm_lock, lockargs, res, args, res, Ck+St),
578 PROC(free_all, notify, void, args, void, 1),
579
580 };
linux v2.6.22.y-op