davinci: dm644x evm: setup NAND flash timing
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / lockd / svcproc.c
blob0f2ab741ae7c8205edeed842e7bbf6f89d6d482f
1 /*
2 * linux/fs/lockd/svcproc.c
4 * Lockd server procedures. We don't implement the NLM_*_RES
5 * procedures because we don't use the async procedures.
7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
8 */
10 #include <linux/types.h>
11 #include <linux/time.h>
12 #include <linux/smp_lock.h>
13 #include <linux/lockd/lockd.h>
14 #include <linux/lockd/share.h>
16 #define NLMDBG_FACILITY NLMDBG_CLIENT
18 #ifdef CONFIG_LOCKD_V4
19 static __be32
20 cast_to_nlm(__be32 status, u32 vers)
22 /* Note: status is assumed to be in network byte order !!! */
23 if (vers != 4){
24 switch (status) {
25 case nlm_granted:
26 case nlm_lck_denied:
27 case nlm_lck_denied_nolocks:
28 case nlm_lck_blocked:
29 case nlm_lck_denied_grace_period:
30 case nlm_drop_reply:
31 break;
32 case nlm4_deadlock:
33 status = nlm_lck_denied;
34 break;
35 default:
36 status = nlm_lck_denied_nolocks;
40 return (status);
42 #define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
43 #else
44 #define cast_status(status) (status)
45 #endif
48 * Obtain client and file from arguments
50 static __be32
51 nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
52 struct nlm_host **hostp, struct nlm_file **filp)
54 struct nlm_host *host = NULL;
55 struct nlm_file *file = NULL;
56 struct nlm_lock *lock = &argp->lock;
57 __be32 error = 0;
59 /* nfsd callbacks must have been installed for this procedure */
60 if (!nlmsvc_ops)
61 return nlm_lck_denied_nolocks;
63 /* Obtain host handle */
64 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
65 || (argp->monitor && nsm_monitor(host) < 0))
66 goto no_locks;
67 *hostp = host;
69 /* Obtain file pointer. Not used by FREE_ALL call. */
70 if (filp != NULL) {
71 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
72 goto no_locks;
73 *filp = file;
75 /* Set up the missing parts of the file_lock structure */
76 lock->fl.fl_file = file->f_file;
77 lock->fl.fl_owner = (fl_owner_t) host;
78 lock->fl.fl_lmops = &nlmsvc_lock_operations;
81 return 0;
83 no_locks:
84 nlm_release_host(host);
85 if (error)
86 return error;
87 return nlm_lck_denied_nolocks;
91 * NULL: Test for presence of service
93 static __be32
94 nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
96 dprintk("lockd: NULL called\n");
97 return rpc_success;
101 * TEST: Check for conflicting lock
103 static __be32
104 nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
105 struct nlm_res *resp)
107 struct nlm_host *host;
108 struct nlm_file *file;
109 __be32 rc = rpc_success;
111 dprintk("lockd: TEST called\n");
112 resp->cookie = argp->cookie;
114 /* Obtain client and file */
115 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
116 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
118 /* Now check for conflicting locks */
119 resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
120 if (resp->status == nlm_drop_reply)
121 rc = rpc_drop_reply;
122 else
123 dprintk("lockd: TEST status %d vers %d\n",
124 ntohl(resp->status), rqstp->rq_vers);
126 nlm_release_host(host);
127 nlm_release_file(file);
128 return rc;
131 static __be32
132 nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
133 struct nlm_res *resp)
135 struct nlm_host *host;
136 struct nlm_file *file;
137 __be32 rc = rpc_success;
139 dprintk("lockd: LOCK called\n");
141 resp->cookie = argp->cookie;
143 /* Obtain client and file */
144 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
145 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
147 #if 0
148 /* If supplied state doesn't match current state, we assume it's
149 * an old request that time-warped somehow. Any error return would
150 * do in this case because it's irrelevant anyway.
152 * NB: We don't retrieve the remote host's state yet.
154 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
155 resp->status = nlm_lck_denied_nolocks;
156 } else
157 #endif
159 /* Now try to lock the file */
160 resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
161 argp->block, &argp->cookie,
162 argp->reclaim));
163 if (resp->status == nlm_drop_reply)
164 rc = rpc_drop_reply;
165 else
166 dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
168 nlm_release_host(host);
169 nlm_release_file(file);
170 return rc;
173 static __be32
174 nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
175 struct nlm_res *resp)
177 struct nlm_host *host;
178 struct nlm_file *file;
180 dprintk("lockd: CANCEL called\n");
182 resp->cookie = argp->cookie;
184 /* Don't accept requests during grace period */
185 if (locks_in_grace()) {
186 resp->status = nlm_lck_denied_grace_period;
187 return rpc_success;
190 /* Obtain client and file */
191 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
192 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
194 /* Try to cancel request. */
195 resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
197 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
198 nlm_release_host(host);
199 nlm_release_file(file);
200 return rpc_success;
204 * UNLOCK: release a lock
206 static __be32
207 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
208 struct nlm_res *resp)
210 struct nlm_host *host;
211 struct nlm_file *file;
213 dprintk("lockd: UNLOCK called\n");
215 resp->cookie = argp->cookie;
217 /* Don't accept new lock requests during grace period */
218 if (locks_in_grace()) {
219 resp->status = nlm_lck_denied_grace_period;
220 return rpc_success;
223 /* Obtain client and file */
224 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
225 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
227 /* Now try to remove the lock */
228 resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
230 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
231 nlm_release_host(host);
232 nlm_release_file(file);
233 return rpc_success;
237 * GRANTED: A server calls us to tell that a process' lock request
238 * was granted
240 static __be32
241 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
242 struct nlm_res *resp)
244 resp->cookie = argp->cookie;
246 dprintk("lockd: GRANTED called\n");
247 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
248 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
249 return rpc_success;
253 * This is the generic lockd callback for async RPC calls
255 static void nlmsvc_callback_exit(struct rpc_task *task, void *data)
257 dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
258 -task->tk_status);
261 static void nlmsvc_callback_release(void *data)
263 lock_kernel();
264 nlm_release_call(data);
265 unlock_kernel();
268 static const struct rpc_call_ops nlmsvc_callback_ops = {
269 .rpc_call_done = nlmsvc_callback_exit,
270 .rpc_release = nlmsvc_callback_release,
274 * `Async' versions of the above service routines. They aren't really,
275 * because we send the callback before the reply proper. I hope this
276 * doesn't break any clients.
278 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
279 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *))
281 struct nlm_host *host;
282 struct nlm_rqst *call;
283 __be32 stat;
285 host = nlmsvc_lookup_host(rqstp,
286 argp->lock.caller,
287 argp->lock.len);
288 if (host == NULL)
289 return rpc_system_err;
291 call = nlm_alloc_call(host);
292 if (call == NULL)
293 return rpc_system_err;
295 stat = func(rqstp, argp, &call->a_res);
296 if (stat != 0) {
297 nlm_release_call(call);
298 return stat;
301 call->a_flags = RPC_TASK_ASYNC;
302 if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
303 return rpc_system_err;
304 return rpc_success;
307 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
308 void *resp)
310 dprintk("lockd: TEST_MSG called\n");
311 return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
314 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
315 void *resp)
317 dprintk("lockd: LOCK_MSG called\n");
318 return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
321 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
322 void *resp)
324 dprintk("lockd: CANCEL_MSG called\n");
325 return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
328 static __be32
329 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
330 void *resp)
332 dprintk("lockd: UNLOCK_MSG called\n");
333 return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
336 static __be32
337 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
338 void *resp)
340 dprintk("lockd: GRANTED_MSG called\n");
341 return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
345 * SHARE: create a DOS share or alter existing share.
347 static __be32
348 nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
349 struct nlm_res *resp)
351 struct nlm_host *host;
352 struct nlm_file *file;
354 dprintk("lockd: SHARE called\n");
356 resp->cookie = argp->cookie;
358 /* Don't accept new lock requests during grace period */
359 if (locks_in_grace() && !argp->reclaim) {
360 resp->status = nlm_lck_denied_grace_period;
361 return rpc_success;
364 /* Obtain client and file */
365 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
366 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
368 /* Now try to create the share */
369 resp->status = cast_status(nlmsvc_share_file(host, file, argp));
371 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
372 nlm_release_host(host);
373 nlm_release_file(file);
374 return rpc_success;
378 * UNSHARE: Release a DOS share.
380 static __be32
381 nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
382 struct nlm_res *resp)
384 struct nlm_host *host;
385 struct nlm_file *file;
387 dprintk("lockd: UNSHARE called\n");
389 resp->cookie = argp->cookie;
391 /* Don't accept requests during grace period */
392 if (locks_in_grace()) {
393 resp->status = nlm_lck_denied_grace_period;
394 return rpc_success;
397 /* Obtain client and file */
398 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
399 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
401 /* Now try to unshare the file */
402 resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
404 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
405 nlm_release_host(host);
406 nlm_release_file(file);
407 return rpc_success;
411 * NM_LOCK: Create an unmonitored lock
413 static __be32
414 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
415 struct nlm_res *resp)
417 dprintk("lockd: NM_LOCK called\n");
419 argp->monitor = 0; /* just clean the monitor flag */
420 return nlmsvc_proc_lock(rqstp, argp, resp);
424 * FREE_ALL: Release all locks and shares held by client
426 static __be32
427 nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
428 void *resp)
430 struct nlm_host *host;
432 /* Obtain client */
433 if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
434 return rpc_success;
436 nlmsvc_free_host_resources(host);
437 nlm_release_host(host);
438 return rpc_success;
442 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
444 static __be32
445 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
446 void *resp)
448 dprintk("lockd: SM_NOTIFY called\n");
450 if (!nlm_privileged_requester(rqstp)) {
451 char buf[RPC_MAX_ADDRBUFLEN];
452 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
453 svc_print_addr(rqstp, buf, sizeof(buf)));
454 return rpc_system_err;
457 nlm_host_rebooted(argp);
458 return rpc_success;
462 * client sent a GRANTED_RES, let's remove the associated block
464 static __be32
465 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp,
466 void *resp)
468 if (!nlmsvc_ops)
469 return rpc_success;
471 dprintk("lockd: GRANTED_RES called\n");
473 nlmsvc_grant_reply(&argp->cookie, argp->status);
474 return rpc_success;
478 * NLM Server procedures.
481 #define nlmsvc_encode_norep nlmsvc_encode_void
482 #define nlmsvc_decode_norep nlmsvc_decode_void
483 #define nlmsvc_decode_testres nlmsvc_decode_void
484 #define nlmsvc_decode_lockres nlmsvc_decode_void
485 #define nlmsvc_decode_unlockres nlmsvc_decode_void
486 #define nlmsvc_decode_cancelres nlmsvc_decode_void
487 #define nlmsvc_decode_grantedres nlmsvc_decode_void
489 #define nlmsvc_proc_none nlmsvc_proc_null
490 #define nlmsvc_proc_test_res nlmsvc_proc_null
491 #define nlmsvc_proc_lock_res nlmsvc_proc_null
492 #define nlmsvc_proc_cancel_res nlmsvc_proc_null
493 #define nlmsvc_proc_unlock_res nlmsvc_proc_null
495 struct nlm_void { int dummy; };
497 #define PROC(name, xargt, xrest, argt, rest, respsize) \
498 { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \
499 .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \
500 .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \
501 .pc_release = NULL, \
502 .pc_argsize = sizeof(struct nlm_##argt), \
503 .pc_ressize = sizeof(struct nlm_##rest), \
504 .pc_xdrressize = respsize, \
507 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
508 #define St 1 /* status */
509 #define No (1+1024/4) /* Net Obj */
510 #define Rg 2 /* range - offset + size */
512 struct svc_procedure nlmsvc_procedures[] = {
513 PROC(null, void, void, void, void, 1),
514 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
515 PROC(lock, lockargs, res, args, res, Ck+St),
516 PROC(cancel, cancargs, res, args, res, Ck+St),
517 PROC(unlock, unlockargs, res, args, res, Ck+St),
518 PROC(granted, testargs, res, args, res, Ck+St),
519 PROC(test_msg, testargs, norep, args, void, 1),
520 PROC(lock_msg, lockargs, norep, args, void, 1),
521 PROC(cancel_msg, cancargs, norep, args, void, 1),
522 PROC(unlock_msg, unlockargs, norep, args, void, 1),
523 PROC(granted_msg, testargs, norep, args, void, 1),
524 PROC(test_res, testres, norep, res, void, 1),
525 PROC(lock_res, lockres, norep, res, void, 1),
526 PROC(cancel_res, cancelres, norep, res, void, 1),
527 PROC(unlock_res, unlockres, norep, res, void, 1),
528 PROC(granted_res, res, norep, res, void, 1),
529 /* statd callback */
530 PROC(sm_notify, reboot, void, reboot, void, 1),
531 PROC(none, void, void, void, void, 1),
532 PROC(none, void, void, void, void, 1),
533 PROC(none, void, void, void, void, 1),
534 PROC(share, shareargs, shareres, args, res, Ck+St+1),
535 PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
536 PROC(nm_lock, lockargs, res, args, res, Ck+St),
537 PROC(free_all, notify, void, args, void, 0),