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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/lockd/lockd.h>
13#include <linux/lockd/share.h>
14
15#define NLMDBG_FACILITY NLMDBG_CLIENT
16
17/*
18 * Obtain client and file from arguments
19 */
20static __be32
21nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
22 struct nlm_host **hostp, struct nlm_file **filp)
23{
24 struct nlm_host *host = NULL;
25 struct nlm_file *file = NULL;
26 struct nlm_lock *lock = &argp->lock;
27 __be32 error = 0;
28
29 /* nfsd callbacks must have been installed for this procedure */
30 if (!nlmsvc_ops)
31 return nlm_lck_denied_nolocks;
32
33 /* Obtain host handle */
34 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
35 || (argp->monitor && nsm_monitor(host) < 0))
36 goto no_locks;
37 *hostp = host;
38
39 /* Obtain file pointer. Not used by FREE_ALL call. */
40 if (filp != NULL) {
41 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
42 goto no_locks;
43 *filp = file;
44
45 /* Set up the missing parts of the file_lock structure */
46 lock->fl.fl_file = file->f_file;
47 lock->fl.fl_owner = (fl_owner_t) host;
48 lock->fl.fl_lmops = &nlmsvc_lock_operations;
49 }
50
51 return 0;
52
53no_locks:
54 nlmsvc_release_host(host);
55 if (error)
56 return error;
57 return nlm_lck_denied_nolocks;
58}
59
60/*
61 * NULL: Test for presence of service
62 */
63static __be32
64nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
65{
66 dprintk("lockd: NULL called\n");
67 return rpc_success;
68}
69
70/*
71 * TEST: Check for conflicting lock
72 */
73static __be32
74nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
75 struct nlm_res *resp)
76{
77 struct nlm_host *host;
78 struct nlm_file *file;
79 __be32 rc = rpc_success;
80
81 dprintk("lockd: TEST4 called\n");
82 resp->cookie = argp->cookie;
83
84 /* Obtain client and file */
85 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
86 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
87
88 /* Now check for conflicting locks */
89 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
90 if (resp->status == nlm_drop_reply)
91 rc = rpc_drop_reply;
92 else
93 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
94
95 nlmsvc_release_host(host);
96 nlm_release_file(file);
97 return rc;
98}
99
100static __be32
101nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
102 struct nlm_res *resp)
103{
104 struct nlm_host *host;
105 struct nlm_file *file;
106 __be32 rc = rpc_success;
107
108 dprintk("lockd: LOCK called\n");
109
110 resp->cookie = argp->cookie;
111
112 /* Obtain client and file */
113 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
114 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
115
116#if 0
117 /* If supplied state doesn't match current state, we assume it's
118 * an old request that time-warped somehow. Any error return would
119 * do in this case because it's irrelevant anyway.
120 *
121 * NB: We don't retrieve the remote host's state yet.
122 */
123 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
124 resp->status = nlm_lck_denied_nolocks;
125 } else
126#endif
127
128 /* Now try to lock the file */
129 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
130 argp->block, &argp->cookie,
131 argp->reclaim);
132 if (resp->status == nlm_drop_reply)
133 rc = rpc_drop_reply;
134 else
135 dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
136
137 nlmsvc_release_host(host);
138 nlm_release_file(file);
139 return rc;
140}
141
142static __be32
143nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
144 struct nlm_res *resp)
145{
146 struct nlm_host *host;
147 struct nlm_file *file;
148
149 dprintk("lockd: CANCEL called\n");
150
151 resp->cookie = argp->cookie;
152
153 /* Don't accept requests during grace period */
154 if (locks_in_grace()) {
155 resp->status = nlm_lck_denied_grace_period;
156 return rpc_success;
157 }
158
159 /* Obtain client and file */
160 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
161 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
162
163 /* Try to cancel request. */
164 resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
165
166 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
167 nlmsvc_release_host(host);
168 nlm_release_file(file);
169 return rpc_success;
170}
171
172/*
173 * UNLOCK: release a lock
174 */
175static __be32
176nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
177 struct nlm_res *resp)
178{
179 struct nlm_host *host;
180 struct nlm_file *file;
181
182 dprintk("lockd: UNLOCK called\n");
183
184 resp->cookie = argp->cookie;
185
186 /* Don't accept new lock requests during grace period */
187 if (locks_in_grace()) {
188 resp->status = nlm_lck_denied_grace_period;
189 return rpc_success;
190 }
191
192 /* Obtain client and file */
193 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
194 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
195
196 /* Now try to remove the lock */
197 resp->status = nlmsvc_unlock(file, &argp->lock);
198
199 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
200 nlmsvc_release_host(host);
201 nlm_release_file(file);
202 return rpc_success;
203}
204
205/*
206 * GRANTED: A server calls us to tell that a process' lock request
207 * was granted
208 */
209static __be32
210nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
211 struct nlm_res *resp)
212{
213 resp->cookie = argp->cookie;
214
215 dprintk("lockd: GRANTED called\n");
216 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
217 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
218 return rpc_success;
219}
220
221/*
222 * This is the generic lockd callback for async RPC calls
223 */
224static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
225{
226 dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
227 -task->tk_status);
228}
229
230static void nlm4svc_callback_release(void *data)
231{
232 nlmsvc_release_call(data);
233}
234
235static const struct rpc_call_ops nlm4svc_callback_ops = {
236 .rpc_call_done = nlm4svc_callback_exit,
237 .rpc_release = nlm4svc_callback_release,
238};
239
240/*
241 * `Async' versions of the above service routines. They aren't really,
242 * because we send the callback before the reply proper. I hope this
243 * doesn't break any clients.
244 */
245static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
246 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *))
247{
248 struct nlm_host *host;
249 struct nlm_rqst *call;
250 __be32 stat;
251
252 host = nlmsvc_lookup_host(rqstp,
253 argp->lock.caller,
254 argp->lock.len);
255 if (host == NULL)
256 return rpc_system_err;
257
258 call = nlm_alloc_call(host);
259 if (call == NULL)
260 return rpc_system_err;
261
262 stat = func(rqstp, argp, &call->a_res);
263 if (stat != 0) {
264 nlmsvc_release_call(call);
265 return stat;
266 }
267
268 call->a_flags = RPC_TASK_ASYNC;
269 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
270 return rpc_system_err;
271 return rpc_success;
272}
273
274static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
275 void *resp)
276{
277 dprintk("lockd: TEST_MSG called\n");
278 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
279}
280
281static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
282 void *resp)
283{
284 dprintk("lockd: LOCK_MSG called\n");
285 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
286}
287
288static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
289 void *resp)
290{
291 dprintk("lockd: CANCEL_MSG called\n");
292 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
293}
294
295static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
296 void *resp)
297{
298 dprintk("lockd: UNLOCK_MSG called\n");
299 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
300}
301
302static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
303 void *resp)
304{
305 dprintk("lockd: GRANTED_MSG called\n");
306 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
307}
308
309/*
310 * SHARE: create a DOS share or alter existing share.
311 */
312static __be32
313nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
314 struct nlm_res *resp)
315{
316 struct nlm_host *host;
317 struct nlm_file *file;
318
319 dprintk("lockd: SHARE called\n");
320
321 resp->cookie = argp->cookie;
322
323 /* Don't accept new lock requests during grace period */
324 if (locks_in_grace() && !argp->reclaim) {
325 resp->status = nlm_lck_denied_grace_period;
326 return rpc_success;
327 }
328
329 /* Obtain client and file */
330 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
331 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
332
333 /* Now try to create the share */
334 resp->status = nlmsvc_share_file(host, file, argp);
335
336 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
337 nlmsvc_release_host(host);
338 nlm_release_file(file);
339 return rpc_success;
340}
341
342/*
343 * UNSHARE: Release a DOS share.
344 */
345static __be32
346nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
347 struct nlm_res *resp)
348{
349 struct nlm_host *host;
350 struct nlm_file *file;
351
352 dprintk("lockd: UNSHARE called\n");
353
354 resp->cookie = argp->cookie;
355
356 /* Don't accept requests during grace period */
357 if (locks_in_grace()) {
358 resp->status = nlm_lck_denied_grace_period;
359 return rpc_success;
360 }
361
362 /* Obtain client and file */
363 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
364 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
365
366 /* Now try to lock the file */
367 resp->status = nlmsvc_unshare_file(host, file, argp);
368
369 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
370 nlmsvc_release_host(host);
371 nlm_release_file(file);
372 return rpc_success;
373}
374
375/*
376 * NM_LOCK: Create an unmonitored lock
377 */
378static __be32
379nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
380 struct nlm_res *resp)
381{
382 dprintk("lockd: NM_LOCK called\n");
383
384 argp->monitor = 0; /* just clean the monitor flag */
385 return nlm4svc_proc_lock(rqstp, argp, resp);
386}
387
388/*
389 * FREE_ALL: Release all locks and shares held by client
390 */
391static __be32
392nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
393 void *resp)
394{
395 struct nlm_host *host;
396
397 /* Obtain client */
398 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
399 return rpc_success;
400
401 nlmsvc_free_host_resources(host);
402 nlmsvc_release_host(host);
403 return rpc_success;
404}
405
406/*
407 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
408 */
409static __be32
410nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
411 void *resp)
412{
413 dprintk("lockd: SM_NOTIFY called\n");
414
415 if (!nlm_privileged_requester(rqstp)) {
416 char buf[RPC_MAX_ADDRBUFLEN];
417 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
418 svc_print_addr(rqstp, buf, sizeof(buf)));
419 return rpc_system_err;
420 }
421
422 nlm_host_rebooted(argp);
423 return rpc_success;
424}
425
426/*
427 * client sent a GRANTED_RES, let's remove the associated block
428 */
429static __be32
430nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp,
431 void *resp)
432{
433 if (!nlmsvc_ops)
434 return rpc_success;
435
436 dprintk("lockd: GRANTED_RES called\n");
437
438 nlmsvc_grant_reply(&argp->cookie, argp->status);
439 return rpc_success;
440}
441
442
443/*
444 * NLM Server procedures.
445 */
446
447#define nlm4svc_encode_norep nlm4svc_encode_void
448#define nlm4svc_decode_norep nlm4svc_decode_void
449#define nlm4svc_decode_testres nlm4svc_decode_void
450#define nlm4svc_decode_lockres nlm4svc_decode_void
451#define nlm4svc_decode_unlockres nlm4svc_decode_void
452#define nlm4svc_decode_cancelres nlm4svc_decode_void
453#define nlm4svc_decode_grantedres nlm4svc_decode_void
454
455#define nlm4svc_proc_none nlm4svc_proc_null
456#define nlm4svc_proc_test_res nlm4svc_proc_null
457#define nlm4svc_proc_lock_res nlm4svc_proc_null
458#define nlm4svc_proc_cancel_res nlm4svc_proc_null
459#define nlm4svc_proc_unlock_res nlm4svc_proc_null
460
461struct nlm_void { int dummy; };
462
463#define PROC(name, xargt, xrest, argt, rest, respsize) \
464 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
465 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
466 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
467 .pc_release = NULL, \
468 .pc_argsize = sizeof(struct nlm_##argt), \
469 .pc_ressize = sizeof(struct nlm_##rest), \
470 .pc_xdrressize = respsize, \
471 }
472#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
473#define No (1+1024/4) /* netobj */
474#define St 1 /* status */
475#define Rg 4 /* range (offset + length) */
476struct svc_procedure nlmsvc_procedures4[] = {
477 PROC(null, void, void, void, void, 1),
478 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
479 PROC(lock, lockargs, res, args, res, Ck+St),
480 PROC(cancel, cancargs, res, args, res, Ck+St),
481 PROC(unlock, unlockargs, res, args, res, Ck+St),
482 PROC(granted, testargs, res, args, res, Ck+St),
483 PROC(test_msg, testargs, norep, args, void, 1),
484 PROC(lock_msg, lockargs, norep, args, void, 1),
485 PROC(cancel_msg, cancargs, norep, args, void, 1),
486 PROC(unlock_msg, unlockargs, norep, args, void, 1),
487 PROC(granted_msg, testargs, norep, args, void, 1),
488 PROC(test_res, testres, norep, res, void, 1),
489 PROC(lock_res, lockres, norep, res, void, 1),
490 PROC(cancel_res, cancelres, norep, res, void, 1),
491 PROC(unlock_res, unlockres, norep, res, void, 1),
492 PROC(granted_res, res, norep, res, void, 1),
493 /* statd callback */
494 PROC(sm_notify, reboot, void, reboot, void, 1),
495 PROC(none, void, void, void, void, 0),
496 PROC(none, void, void, void, void, 0),
497 PROC(none, void, void, void, void, 0),
498 PROC(share, shareargs, shareres, args, res, Ck+St+1),
499 PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
500 PROC(nm_lock, lockargs, res, args, res, Ck+St),
501 PROC(free_all, notify, void, args, void, 1),
502
503};
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/lockd/lockd.h>
13#include <linux/lockd/share.h>
14#include <linux/sunrpc/svc_xprt.h>
15
16#define NLMDBG_FACILITY NLMDBG_CLIENT
17
18/*
19 * Obtain client and file from arguments
20 */
21static __be32
22nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
23 struct nlm_host **hostp, struct nlm_file **filp)
24{
25 struct nlm_host *host = NULL;
26 struct nlm_file *file = NULL;
27 struct nlm_lock *lock = &argp->lock;
28 __be32 error = 0;
29
30 /* nfsd callbacks must have been installed for this procedure */
31 if (!nlmsvc_ops)
32 return nlm_lck_denied_nolocks;
33
34 /* Obtain host handle */
35 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
36 || (argp->monitor && nsm_monitor(host) < 0))
37 goto no_locks;
38 *hostp = host;
39
40 /* Obtain file pointer. Not used by FREE_ALL call. */
41 if (filp != NULL) {
42 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
43 goto no_locks;
44 *filp = file;
45
46 /* Set up the missing parts of the file_lock structure */
47 lock->fl.fl_file = file->f_file;
48 lock->fl.fl_owner = (fl_owner_t) host;
49 lock->fl.fl_lmops = &nlmsvc_lock_operations;
50 }
51
52 return 0;
53
54no_locks:
55 nlmsvc_release_host(host);
56 if (error)
57 return error;
58 return nlm_lck_denied_nolocks;
59}
60
61/*
62 * NULL: Test for presence of service
63 */
64static __be32
65nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
66{
67 dprintk("lockd: NULL called\n");
68 return rpc_success;
69}
70
71/*
72 * TEST: Check for conflicting lock
73 */
74static __be32
75nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
76 struct nlm_res *resp)
77{
78 struct nlm_host *host;
79 struct nlm_file *file;
80 __be32 rc = rpc_success;
81
82 dprintk("lockd: TEST4 called\n");
83 resp->cookie = argp->cookie;
84
85 /* Obtain client and file */
86 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
87 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
88
89 /* Now check for conflicting locks */
90 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
91 if (resp->status == nlm_drop_reply)
92 rc = rpc_drop_reply;
93 else
94 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
95
96 nlmsvc_release_host(host);
97 nlm_release_file(file);
98 return rc;
99}
100
101static __be32
102nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
103 struct nlm_res *resp)
104{
105 struct nlm_host *host;
106 struct nlm_file *file;
107 __be32 rc = rpc_success;
108
109 dprintk("lockd: LOCK called\n");
110
111 resp->cookie = argp->cookie;
112
113 /* Obtain client and file */
114 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
115 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
116
117#if 0
118 /* If supplied state doesn't match current state, we assume it's
119 * an old request that time-warped somehow. Any error return would
120 * do in this case because it's irrelevant anyway.
121 *
122 * NB: We don't retrieve the remote host's state yet.
123 */
124 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
125 resp->status = nlm_lck_denied_nolocks;
126 } else
127#endif
128
129 /* Now try to lock the file */
130 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
131 argp->block, &argp->cookie,
132 argp->reclaim);
133 if (resp->status == nlm_drop_reply)
134 rc = rpc_drop_reply;
135 else
136 dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
137
138 nlmsvc_release_host(host);
139 nlm_release_file(file);
140 return rc;
141}
142
143static __be32
144nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
145 struct nlm_res *resp)
146{
147 struct nlm_host *host;
148 struct nlm_file *file;
149
150 dprintk("lockd: CANCEL called\n");
151
152 resp->cookie = argp->cookie;
153
154 /* Don't accept requests during grace period */
155 if (locks_in_grace(SVC_NET(rqstp))) {
156 resp->status = nlm_lck_denied_grace_period;
157 return rpc_success;
158 }
159
160 /* Obtain client and file */
161 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
162 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
163
164 /* Try to cancel request. */
165 resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock);
166
167 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
168 nlmsvc_release_host(host);
169 nlm_release_file(file);
170 return rpc_success;
171}
172
173/*
174 * UNLOCK: release a lock
175 */
176static __be32
177nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
178 struct nlm_res *resp)
179{
180 struct nlm_host *host;
181 struct nlm_file *file;
182
183 dprintk("lockd: UNLOCK called\n");
184
185 resp->cookie = argp->cookie;
186
187 /* Don't accept new lock requests during grace period */
188 if (locks_in_grace(SVC_NET(rqstp))) {
189 resp->status = nlm_lck_denied_grace_period;
190 return rpc_success;
191 }
192
193 /* Obtain client and file */
194 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
195 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
196
197 /* Now try to remove the lock */
198 resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock);
199
200 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
201 nlmsvc_release_host(host);
202 nlm_release_file(file);
203 return rpc_success;
204}
205
206/*
207 * GRANTED: A server calls us to tell that a process' lock request
208 * was granted
209 */
210static __be32
211nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
212 struct nlm_res *resp)
213{
214 resp->cookie = argp->cookie;
215
216 dprintk("lockd: GRANTED called\n");
217 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
218 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
219 return rpc_success;
220}
221
222/*
223 * This is the generic lockd callback for async RPC calls
224 */
225static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
226{
227 dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
228 -task->tk_status);
229}
230
231static void nlm4svc_callback_release(void *data)
232{
233 nlmsvc_release_call(data);
234}
235
236static const struct rpc_call_ops nlm4svc_callback_ops = {
237 .rpc_call_done = nlm4svc_callback_exit,
238 .rpc_release = nlm4svc_callback_release,
239};
240
241/*
242 * `Async' versions of the above service routines. They aren't really,
243 * because we send the callback before the reply proper. I hope this
244 * doesn't break any clients.
245 */
246static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
247 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *))
248{
249 struct nlm_host *host;
250 struct nlm_rqst *call;
251 __be32 stat;
252
253 host = nlmsvc_lookup_host(rqstp,
254 argp->lock.caller,
255 argp->lock.len);
256 if (host == NULL)
257 return rpc_system_err;
258
259 call = nlm_alloc_call(host);
260 nlmsvc_release_host(host);
261 if (call == NULL)
262 return rpc_system_err;
263
264 stat = func(rqstp, argp, &call->a_res);
265 if (stat != 0) {
266 nlmsvc_release_call(call);
267 return stat;
268 }
269
270 call->a_flags = RPC_TASK_ASYNC;
271 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
272 return rpc_system_err;
273 return rpc_success;
274}
275
276static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
277 void *resp)
278{
279 dprintk("lockd: TEST_MSG called\n");
280 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
281}
282
283static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
284 void *resp)
285{
286 dprintk("lockd: LOCK_MSG called\n");
287 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
288}
289
290static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
291 void *resp)
292{
293 dprintk("lockd: CANCEL_MSG called\n");
294 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
295}
296
297static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
298 void *resp)
299{
300 dprintk("lockd: UNLOCK_MSG called\n");
301 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
302}
303
304static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
305 void *resp)
306{
307 dprintk("lockd: GRANTED_MSG called\n");
308 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
309}
310
311/*
312 * SHARE: create a DOS share or alter existing share.
313 */
314static __be32
315nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
316 struct nlm_res *resp)
317{
318 struct nlm_host *host;
319 struct nlm_file *file;
320
321 dprintk("lockd: SHARE called\n");
322
323 resp->cookie = argp->cookie;
324
325 /* Don't accept new lock requests during grace period */
326 if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
327 resp->status = nlm_lck_denied_grace_period;
328 return rpc_success;
329 }
330
331 /* Obtain client and file */
332 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
333 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
334
335 /* Now try to create the share */
336 resp->status = nlmsvc_share_file(host, file, argp);
337
338 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
339 nlmsvc_release_host(host);
340 nlm_release_file(file);
341 return rpc_success;
342}
343
344/*
345 * UNSHARE: Release a DOS share.
346 */
347static __be32
348nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
349 struct nlm_res *resp)
350{
351 struct nlm_host *host;
352 struct nlm_file *file;
353
354 dprintk("lockd: UNSHARE called\n");
355
356 resp->cookie = argp->cookie;
357
358 /* Don't accept requests during grace period */
359 if (locks_in_grace(SVC_NET(rqstp))) {
360 resp->status = nlm_lck_denied_grace_period;
361 return rpc_success;
362 }
363
364 /* Obtain client and file */
365 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
366 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
367
368 /* Now try to lock the file */
369 resp->status = nlmsvc_unshare_file(host, file, argp);
370
371 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
372 nlmsvc_release_host(host);
373 nlm_release_file(file);
374 return rpc_success;
375}
376
377/*
378 * NM_LOCK: Create an unmonitored lock
379 */
380static __be32
381nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
382 struct nlm_res *resp)
383{
384 dprintk("lockd: NM_LOCK called\n");
385
386 argp->monitor = 0; /* just clean the monitor flag */
387 return nlm4svc_proc_lock(rqstp, argp, resp);
388}
389
390/*
391 * FREE_ALL: Release all locks and shares held by client
392 */
393static __be32
394nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
395 void *resp)
396{
397 struct nlm_host *host;
398
399 /* Obtain client */
400 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
401 return rpc_success;
402
403 nlmsvc_free_host_resources(host);
404 nlmsvc_release_host(host);
405 return rpc_success;
406}
407
408/*
409 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
410 */
411static __be32
412nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
413 void *resp)
414{
415 dprintk("lockd: SM_NOTIFY called\n");
416
417 if (!nlm_privileged_requester(rqstp)) {
418 char buf[RPC_MAX_ADDRBUFLEN];
419 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
420 svc_print_addr(rqstp, buf, sizeof(buf)));
421 return rpc_system_err;
422 }
423
424 nlm_host_rebooted(SVC_NET(rqstp), argp);
425 return rpc_success;
426}
427
428/*
429 * client sent a GRANTED_RES, let's remove the associated block
430 */
431static __be32
432nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp,
433 void *resp)
434{
435 if (!nlmsvc_ops)
436 return rpc_success;
437
438 dprintk("lockd: GRANTED_RES called\n");
439
440 nlmsvc_grant_reply(&argp->cookie, argp->status);
441 return rpc_success;
442}
443
444
445/*
446 * NLM Server procedures.
447 */
448
449#define nlm4svc_encode_norep nlm4svc_encode_void
450#define nlm4svc_decode_norep nlm4svc_decode_void
451#define nlm4svc_decode_testres nlm4svc_decode_void
452#define nlm4svc_decode_lockres nlm4svc_decode_void
453#define nlm4svc_decode_unlockres nlm4svc_decode_void
454#define nlm4svc_decode_cancelres nlm4svc_decode_void
455#define nlm4svc_decode_grantedres nlm4svc_decode_void
456
457#define nlm4svc_proc_none nlm4svc_proc_null
458#define nlm4svc_proc_test_res nlm4svc_proc_null
459#define nlm4svc_proc_lock_res nlm4svc_proc_null
460#define nlm4svc_proc_cancel_res nlm4svc_proc_null
461#define nlm4svc_proc_unlock_res nlm4svc_proc_null
462
463struct nlm_void { int dummy; };
464
465#define PROC(name, xargt, xrest, argt, rest, respsize) \
466 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
467 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
468 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
469 .pc_release = NULL, \
470 .pc_argsize = sizeof(struct nlm_##argt), \
471 .pc_ressize = sizeof(struct nlm_##rest), \
472 .pc_xdrressize = respsize, \
473 }
474#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
475#define No (1+1024/4) /* netobj */
476#define St 1 /* status */
477#define Rg 4 /* range (offset + length) */
478struct svc_procedure nlmsvc_procedures4[] = {
479 PROC(null, void, void, void, void, 1),
480 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
481 PROC(lock, lockargs, res, args, res, Ck+St),
482 PROC(cancel, cancargs, res, args, res, Ck+St),
483 PROC(unlock, unlockargs, res, args, res, Ck+St),
484 PROC(granted, testargs, res, args, res, Ck+St),
485 PROC(test_msg, testargs, norep, args, void, 1),
486 PROC(lock_msg, lockargs, norep, args, void, 1),
487 PROC(cancel_msg, cancargs, norep, args, void, 1),
488 PROC(unlock_msg, unlockargs, norep, args, void, 1),
489 PROC(granted_msg, testargs, norep, args, void, 1),
490 PROC(test_res, testres, norep, res, void, 1),
491 PROC(lock_res, lockres, norep, res, void, 1),
492 PROC(cancel_res, cancelres, norep, res, void, 1),
493 PROC(unlock_res, unlockres, norep, res, void, 1),
494 PROC(granted_res, res, norep, res, void, 1),
495 /* statd callback */
496 PROC(sm_notify, reboot, void, reboot, void, 1),
497 PROC(none, void, void, void, void, 0),
498 PROC(none, void, void, void, void, 0),
499 PROC(none, void, void, void, void, 0),
500 PROC(share, shareargs, shareres, args, res, Ck+St+1),
501 PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
502 PROC(nm_lock, lockargs, res, args, res, Ck+St),
503 PROC(free_all, notify, void, args, void, 1),
504
505};