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-rw-r--r--fs/lockd/svcproc.c606
1 files changed, 606 insertions, 0 deletions
diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
new file mode 100644
index 000000000000..757e344cf200
--- /dev/null
+++ b/fs/lockd/svcproc.c
@@ -0,0 +1,606 @@
1/*
2 * linux/fs/lockd/svcproc.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/config.h>
11#include <linux/types.h>
12#include <linux/time.h>
13#include <linux/slab.h>
14#include <linux/in.h>
15#include <linux/sunrpc/svc.h>
16#include <linux/sunrpc/clnt.h>
17#include <linux/nfsd/nfsd.h>
18#include <linux/lockd/lockd.h>
19#include <linux/lockd/share.h>
20#include <linux/lockd/sm_inter.h>
21
22
23#define NLMDBG_FACILITY NLMDBG_CLIENT
24
25static u32 nlmsvc_callback(struct svc_rqst *, u32, struct nlm_res *);
26static void nlmsvc_callback_exit(struct rpc_task *);
27
28#ifdef CONFIG_LOCKD_V4
29static u32
30cast_to_nlm(u32 status, u32 vers)
31{
32 /* Note: status is assumed to be in network byte order !!! */
33 if (vers != 4){
34 switch (status) {
35 case nlm_granted:
36 case nlm_lck_denied:
37 case nlm_lck_denied_nolocks:
38 case nlm_lck_blocked:
39 case nlm_lck_denied_grace_period:
40 break;
41 case nlm4_deadlock:
42 status = nlm_lck_denied;
43 break;
44 default:
45 status = nlm_lck_denied_nolocks;
46 }
47 }
48
49 return (status);
50}
51#define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
52#else
53#define cast_status(status) (status)
54#endif
55
56/*
57 * Obtain client and file from arguments
58 */
59static u32
60nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
61 struct nlm_host **hostp, struct nlm_file **filp)
62{
63 struct nlm_host *host = NULL;
64 struct nlm_file *file = NULL;
65 struct nlm_lock *lock = &argp->lock;
66 u32 error;
67
68 /* nfsd callbacks must have been installed for this procedure */
69 if (!nlmsvc_ops)
70 return nlm_lck_denied_nolocks;
71
72 /* Obtain host handle */
73 if (!(host = nlmsvc_lookup_host(rqstp))
74 || (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0))
75 goto no_locks;
76 *hostp = host;
77
78 /* Obtain file pointer. Not used by FREE_ALL call. */
79 if (filp != NULL) {
80 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
81 goto no_locks;
82 *filp = file;
83
84 /* Set up the missing parts of the file_lock structure */
85 lock->fl.fl_file = file->f_file;
86 lock->fl.fl_owner = (fl_owner_t) host;
87 lock->fl.fl_lmops = &nlmsvc_lock_operations;
88 }
89
90 return 0;
91
92no_locks:
93 if (host)
94 nlm_release_host(host);
95 return nlm_lck_denied_nolocks;
96}
97
98/*
99 * NULL: Test for presence of service
100 */
101static int
102nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
103{
104 dprintk("lockd: NULL called\n");
105 return rpc_success;
106}
107
108/*
109 * TEST: Check for conflicting lock
110 */
111static int
112nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
113 struct nlm_res *resp)
114{
115 struct nlm_host *host;
116 struct nlm_file *file;
117
118 dprintk("lockd: TEST called\n");
119 resp->cookie = argp->cookie;
120
121 /* Don't accept test requests during grace period */
122 if (nlmsvc_grace_period) {
123 resp->status = nlm_lck_denied_grace_period;
124 return rpc_success;
125 }
126
127 /* Obtain client and file */
128 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
129 return rpc_success;
130
131 /* Now check for conflicting locks */
132 resp->status = cast_status(nlmsvc_testlock(file, &argp->lock, &resp->lock));
133
134 dprintk("lockd: TEST status %d vers %d\n",
135 ntohl(resp->status), rqstp->rq_vers);
136 nlm_release_host(host);
137 nlm_release_file(file);
138 return rpc_success;
139}
140
141static int
142nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
143 struct nlm_res *resp)
144{
145 struct nlm_host *host;
146 struct nlm_file *file;
147
148 dprintk("lockd: LOCK called\n");
149
150 resp->cookie = argp->cookie;
151
152 /* Don't accept new lock requests during grace period */
153 if (nlmsvc_grace_period && !argp->reclaim) {
154 resp->status = nlm_lck_denied_grace_period;
155 return rpc_success;
156 }
157
158 /* Obtain client and file */
159 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
160 return rpc_success;
161
162#if 0
163 /* If supplied state doesn't match current state, we assume it's
164 * an old request that time-warped somehow. Any error return would
165 * do in this case because it's irrelevant anyway.
166 *
167 * NB: We don't retrieve the remote host's state yet.
168 */
169 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
170 resp->status = nlm_lck_denied_nolocks;
171 } else
172#endif
173
174 /* Now try to lock the file */
175 resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock,
176 argp->block, &argp->cookie));
177
178 dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
179 nlm_release_host(host);
180 nlm_release_file(file);
181 return rpc_success;
182}
183
184static int
185nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
186 struct nlm_res *resp)
187{
188 struct nlm_host *host;
189 struct nlm_file *file;
190
191 dprintk("lockd: CANCEL called\n");
192
193 resp->cookie = argp->cookie;
194
195 /* Don't accept requests during grace period */
196 if (nlmsvc_grace_period) {
197 resp->status = nlm_lck_denied_grace_period;
198 return rpc_success;
199 }
200
201 /* Obtain client and file */
202 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
203 return rpc_success;
204
205 /* Try to cancel request. */
206 resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
207
208 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
209 nlm_release_host(host);
210 nlm_release_file(file);
211 return rpc_success;
212}
213
214/*
215 * UNLOCK: release a lock
216 */
217static int
218nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
219 struct nlm_res *resp)
220{
221 struct nlm_host *host;
222 struct nlm_file *file;
223
224 dprintk("lockd: UNLOCK called\n");
225
226 resp->cookie = argp->cookie;
227
228 /* Don't accept new lock requests during grace period */
229 if (nlmsvc_grace_period) {
230 resp->status = nlm_lck_denied_grace_period;
231 return rpc_success;
232 }
233
234 /* Obtain client and file */
235 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
236 return rpc_success;
237
238 /* Now try to remove the lock */
239 resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
240
241 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
242 nlm_release_host(host);
243 nlm_release_file(file);
244 return rpc_success;
245}
246
247/*
248 * GRANTED: A server calls us to tell that a process' lock request
249 * was granted
250 */
251static int
252nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
253 struct nlm_res *resp)
254{
255 resp->cookie = argp->cookie;
256
257 dprintk("lockd: GRANTED called\n");
258 resp->status = nlmclnt_grant(&argp->lock);
259 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
260 return rpc_success;
261}
262
263/*
264 * `Async' versions of the above service routines. They aren't really,
265 * because we send the callback before the reply proper. I hope this
266 * doesn't break any clients.
267 */
268static int
269nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
270 void *resp)
271{
272 struct nlm_res res;
273 u32 stat;
274
275 dprintk("lockd: TEST_MSG called\n");
276 memset(&res, 0, sizeof(res));
277
278 if ((stat = nlmsvc_proc_test(rqstp, argp, &res)) == 0)
279 stat = nlmsvc_callback(rqstp, NLMPROC_TEST_RES, &res);
280 return stat;
281}
282
283static int
284nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
285 void *resp)
286{
287 struct nlm_res res;
288 u32 stat;
289
290 dprintk("lockd: LOCK_MSG called\n");
291 memset(&res, 0, sizeof(res));
292
293 if ((stat = nlmsvc_proc_lock(rqstp, argp, &res)) == 0)
294 stat = nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, &res);
295 return stat;
296}
297
298static int
299nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
300 void *resp)
301{
302 struct nlm_res res;
303 u32 stat;
304
305 dprintk("lockd: CANCEL_MSG called\n");
306 memset(&res, 0, sizeof(res));
307
308 if ((stat = nlmsvc_proc_cancel(rqstp, argp, &res)) == 0)
309 stat = nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, &res);
310 return stat;
311}
312
313static int
314nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
315 void *resp)
316{
317 struct nlm_res res;
318 u32 stat;
319
320 dprintk("lockd: UNLOCK_MSG called\n");
321 memset(&res, 0, sizeof(res));
322
323 if ((stat = nlmsvc_proc_unlock(rqstp, argp, &res)) == 0)
324 stat = nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, &res);
325 return stat;
326}
327
328static int
329nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
330 void *resp)
331{
332 struct nlm_res res;
333 u32 stat;
334
335 dprintk("lockd: GRANTED_MSG called\n");
336 memset(&res, 0, sizeof(res));
337
338 if ((stat = nlmsvc_proc_granted(rqstp, argp, &res)) == 0)
339 stat = nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, &res);
340 return stat;
341}
342
343/*
344 * SHARE: create a DOS share or alter existing share.
345 */
346static int
347nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
348 struct nlm_res *resp)
349{
350 struct nlm_host *host;
351 struct nlm_file *file;
352
353 dprintk("lockd: SHARE called\n");
354
355 resp->cookie = argp->cookie;
356
357 /* Don't accept new lock requests during grace period */
358 if (nlmsvc_grace_period && !argp->reclaim) {
359 resp->status = nlm_lck_denied_grace_period;
360 return rpc_success;
361 }
362
363 /* Obtain client and file */
364 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
365 return rpc_success;
366
367 /* Now try to create the share */
368 resp->status = cast_status(nlmsvc_share_file(host, file, argp));
369
370 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
371 nlm_release_host(host);
372 nlm_release_file(file);
373 return rpc_success;
374}
375
376/*
377 * UNSHARE: Release a DOS share.
378 */
379static int
380nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
381 struct nlm_res *resp)
382{
383 struct nlm_host *host;
384 struct nlm_file *file;
385
386 dprintk("lockd: UNSHARE called\n");
387
388 resp->cookie = argp->cookie;
389
390 /* Don't accept requests during grace period */
391 if (nlmsvc_grace_period) {
392 resp->status = nlm_lck_denied_grace_period;
393 return rpc_success;
394 }
395
396 /* Obtain client and file */
397 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
398 return rpc_success;
399
400 /* Now try to unshare the file */
401 resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
402
403 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
404 nlm_release_host(host);
405 nlm_release_file(file);
406 return rpc_success;
407}
408
409/*
410 * NM_LOCK: Create an unmonitored lock
411 */
412static int
413nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
414 struct nlm_res *resp)
415{
416 dprintk("lockd: NM_LOCK called\n");
417
418 argp->monitor = 0; /* just clean the monitor flag */
419 return nlmsvc_proc_lock(rqstp, argp, resp);
420}
421
422/*
423 * FREE_ALL: Release all locks and shares held by client
424 */
425static int
426nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
427 void *resp)
428{
429 struct nlm_host *host;
430
431 /* Obtain client */
432 if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
433 return rpc_success;
434
435 nlmsvc_free_host_resources(host);
436 nlm_release_host(host);
437 return rpc_success;
438}
439
440/*
441 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
442 */
443static int
444nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
445 void *resp)
446{
447 struct sockaddr_in saddr = rqstp->rq_addr;
448 int vers = argp->vers;
449 int prot = argp->proto >> 1;
450 struct nlm_host *host;
451
452 dprintk("lockd: SM_NOTIFY called\n");
453 if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
454 || ntohs(saddr.sin_port) >= 1024) {
455 printk(KERN_WARNING
456 "lockd: rejected NSM callback from %08x:%d\n",
457 ntohl(rqstp->rq_addr.sin_addr.s_addr),
458 ntohs(rqstp->rq_addr.sin_port));
459 return rpc_system_err;
460 }
461
462 /* Obtain the host pointer for this NFS server and try to
463 * reclaim all locks we hold on this server.
464 */
465 saddr.sin_addr.s_addr = argp->addr;
466 if ((argp->proto & 1)==0) {
467 if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) {
468 nlmclnt_recovery(host, argp->state);
469 nlm_release_host(host);
470 }
471 } else {
472 /* If we run on an NFS server, delete all locks held by the client */
473 if ((host = nlm_lookup_host(1, &saddr, prot, vers)) != NULL) {
474 nlmsvc_free_host_resources(host);
475 nlm_release_host(host);
476 }
477 }
478
479 return rpc_success;
480}
481
482/*
483 * client sent a GRANTED_RES, let's remove the associated block
484 */
485static int
486nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp,
487 void *resp)
488{
489 if (!nlmsvc_ops)
490 return rpc_success;
491
492 dprintk("lockd: GRANTED_RES called\n");
493
494 nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status);
495 return rpc_success;
496}
497
498/*
499 * This is the generic lockd callback for async RPC calls
500 */
501static u32
502nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_res *resp)
503{
504 struct nlm_host *host;
505 struct nlm_rqst *call;
506
507 if (!(call = nlmclnt_alloc_call()))
508 return rpc_system_err;
509
510 host = nlmclnt_lookup_host(&rqstp->rq_addr,
511 rqstp->rq_prot, rqstp->rq_vers);
512 if (!host) {
513 kfree(call);
514 return rpc_system_err;
515 }
516
517 call->a_flags = RPC_TASK_ASYNC;
518 call->a_host = host;
519 memcpy(&call->a_args, resp, sizeof(*resp));
520
521 if (nlmsvc_async_call(call, proc, nlmsvc_callback_exit) < 0)
522 goto error;
523
524 return rpc_success;
525 error:
526 nlm_release_host(host);
527 kfree(call);
528 return rpc_system_err;
529}
530
531static void
532nlmsvc_callback_exit(struct rpc_task *task)
533{
534 struct nlm_rqst *call = (struct nlm_rqst *) task->tk_calldata;
535
536 if (task->tk_status < 0) {
537 dprintk("lockd: %4d callback failed (errno = %d)\n",
538 task->tk_pid, -task->tk_status);
539 }
540 nlm_release_host(call->a_host);
541 kfree(call);
542}
543
544/*
545 * NLM Server procedures.
546 */
547
548#define nlmsvc_encode_norep nlmsvc_encode_void
549#define nlmsvc_decode_norep nlmsvc_decode_void
550#define nlmsvc_decode_testres nlmsvc_decode_void
551#define nlmsvc_decode_lockres nlmsvc_decode_void
552#define nlmsvc_decode_unlockres nlmsvc_decode_void
553#define nlmsvc_decode_cancelres nlmsvc_decode_void
554#define nlmsvc_decode_grantedres nlmsvc_decode_void
555
556#define nlmsvc_proc_none nlmsvc_proc_null
557#define nlmsvc_proc_test_res nlmsvc_proc_null
558#define nlmsvc_proc_lock_res nlmsvc_proc_null
559#define nlmsvc_proc_cancel_res nlmsvc_proc_null
560#define nlmsvc_proc_unlock_res nlmsvc_proc_null
561
562struct nlm_void { int dummy; };
563
564#define PROC(name, xargt, xrest, argt, rest, respsize) \
565 { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \
566 .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \
567 .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \
568 .pc_release = NULL, \
569 .pc_argsize = sizeof(struct nlm_##argt), \
570 .pc_ressize = sizeof(struct nlm_##rest), \
571 .pc_xdrressize = respsize, \
572 }
573
574#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
575#define St 1 /* status */
576#define No (1+1024/4) /* Net Obj */
577#define Rg 2 /* range - offset + size */
578
579struct svc_procedure nlmsvc_procedures[] = {
580 PROC(null, void, void, void, void, 1),
581 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
582 PROC(lock, lockargs, res, args, res, Ck+St),
583 PROC(cancel, cancargs, res, args, res, Ck+St),
584 PROC(unlock, unlockargs, res, args, res, Ck+St),
585 PROC(granted, testargs, res, args, res, Ck+St),
586 PROC(test_msg, testargs, norep, args, void, 1),
587 PROC(lock_msg, lockargs, norep, args, void, 1),
588 PROC(cancel_msg, cancargs, norep, args, void, 1),
589 PROC(unlock_msg, unlockargs, norep, args, void, 1),
590 PROC(granted_msg, testargs, norep, args, void, 1),
591 PROC(test_res, testres, norep, res, void, 1),
592 PROC(lock_res, lockres, norep, res, void, 1),
593 PROC(cancel_res, cancelres, norep, res, void, 1),
594 PROC(unlock_res, unlockres, norep, res, void, 1),
595 PROC(granted_res, res, norep, res, void, 1),
596 /* statd callback */
597 PROC(sm_notify, reboot, void, reboot, void, 1),
598 PROC(none, void, void, void, void, 1),
599 PROC(none, void, void, void, void, 1),
600 PROC(none, void, void, void, void, 1),
601 PROC(share, shareargs, shareres, args, res, Ck+St+1),
602 PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
603 PROC(nm_lock, lockargs, res, args, res, Ck+St),
604 PROC(free_all, notify, void, args, void, 0),
605
606};