crypto: sha512 - reduce stack usage to safe number
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / lockd / svc4proc.c
blob9a41fdc19511ffb85cccab8fef5d42096bd08dca
1 /*
2 * linux/fs/lockd/svc4proc.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/lockd/lockd.h>
13 #include <linux/lockd/share.h>
15 #define NLMDBG_FACILITY NLMDBG_CLIENT
18 * Obtain client and file from arguments
20 static __be32
21 nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
22 struct nlm_host **hostp, struct nlm_file **filp)
24 struct nlm_host *host = NULL;
25 struct nlm_file *file = NULL;
26 struct nlm_lock *lock = &argp->lock;
27 __be32 error = 0;
29 /* nfsd callbacks must have been installed for this procedure */
30 if (!nlmsvc_ops)
31 return nlm_lck_denied_nolocks;
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;
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;
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;
51 return 0;
53 no_locks:
54 nlmsvc_release_host(host);
55 if (error)
56 return error;
57 return nlm_lck_denied_nolocks;
61 * NULL: Test for presence of service
63 static __be32
64 nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
66 dprintk("lockd: NULL called\n");
67 return rpc_success;
71 * TEST: Check for conflicting lock
73 static __be32
74 nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
75 struct nlm_res *resp)
77 struct nlm_host *host;
78 struct nlm_file *file;
79 __be32 rc = rpc_success;
81 dprintk("lockd: TEST4 called\n");
82 resp->cookie = argp->cookie;
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;
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));
95 nlmsvc_release_host(host);
96 nlm_release_file(file);
97 return rc;
100 static __be32
101 nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
102 struct nlm_res *resp)
104 struct nlm_host *host;
105 struct nlm_file *file;
106 __be32 rc = rpc_success;
108 dprintk("lockd: LOCK called\n");
110 resp->cookie = argp->cookie;
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;
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.
121 * NB: We don't retrieve the remote host's state yet.
123 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
124 resp->status = nlm_lck_denied_nolocks;
125 } else
126 #endif
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));
137 nlmsvc_release_host(host);
138 nlm_release_file(file);
139 return rc;
142 static __be32
143 nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
144 struct nlm_res *resp)
146 struct nlm_host *host;
147 struct nlm_file *file;
149 dprintk("lockd: CANCEL called\n");
151 resp->cookie = argp->cookie;
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;
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;
163 /* Try to cancel request. */
164 resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
166 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
167 nlmsvc_release_host(host);
168 nlm_release_file(file);
169 return rpc_success;
173 * UNLOCK: release a lock
175 static __be32
176 nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
177 struct nlm_res *resp)
179 struct nlm_host *host;
180 struct nlm_file *file;
182 dprintk("lockd: UNLOCK called\n");
184 resp->cookie = argp->cookie;
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;
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;
196 /* Now try to remove the lock */
197 resp->status = nlmsvc_unlock(file, &argp->lock);
199 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
200 nlmsvc_release_host(host);
201 nlm_release_file(file);
202 return rpc_success;
206 * GRANTED: A server calls us to tell that a process' lock request
207 * was granted
209 static __be32
210 nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
211 struct nlm_res *resp)
213 resp->cookie = argp->cookie;
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;
222 * This is the generic lockd callback for async RPC calls
224 static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
226 dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
227 -task->tk_status);
230 static void nlm4svc_callback_release(void *data)
232 nlmsvc_release_call(data);
235 static const struct rpc_call_ops nlm4svc_callback_ops = {
236 .rpc_call_done = nlm4svc_callback_exit,
237 .rpc_release = nlm4svc_callback_release,
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.
245 static __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 *))
248 struct nlm_host *host;
249 struct nlm_rqst *call;
250 __be32 stat;
252 host = nlmsvc_lookup_host(rqstp,
253 argp->lock.caller,
254 argp->lock.len);
255 if (host == NULL)
256 return rpc_system_err;
258 call = nlm_alloc_call(host);
259 if (call == NULL)
260 return rpc_system_err;
262 stat = func(rqstp, argp, &call->a_res);
263 if (stat != 0) {
264 nlmsvc_release_call(call);
265 return stat;
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;
274 static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
275 void *resp)
277 dprintk("lockd: TEST_MSG called\n");
278 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
281 static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
282 void *resp)
284 dprintk("lockd: LOCK_MSG called\n");
285 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
288 static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
289 void *resp)
291 dprintk("lockd: CANCEL_MSG called\n");
292 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
295 static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
296 void *resp)
298 dprintk("lockd: UNLOCK_MSG called\n");
299 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
302 static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
303 void *resp)
305 dprintk("lockd: GRANTED_MSG called\n");
306 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
310 * SHARE: create a DOS share or alter existing share.
312 static __be32
313 nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
314 struct nlm_res *resp)
316 struct nlm_host *host;
317 struct nlm_file *file;
319 dprintk("lockd: SHARE called\n");
321 resp->cookie = argp->cookie;
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;
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;
333 /* Now try to create the share */
334 resp->status = nlmsvc_share_file(host, file, argp);
336 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
337 nlmsvc_release_host(host);
338 nlm_release_file(file);
339 return rpc_success;
343 * UNSHARE: Release a DOS share.
345 static __be32
346 nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
347 struct nlm_res *resp)
349 struct nlm_host *host;
350 struct nlm_file *file;
352 dprintk("lockd: UNSHARE called\n");
354 resp->cookie = argp->cookie;
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;
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;
366 /* Now try to lock the file */
367 resp->status = nlmsvc_unshare_file(host, file, argp);
369 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
370 nlmsvc_release_host(host);
371 nlm_release_file(file);
372 return rpc_success;
376 * NM_LOCK: Create an unmonitored lock
378 static __be32
379 nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
380 struct nlm_res *resp)
382 dprintk("lockd: NM_LOCK called\n");
384 argp->monitor = 0; /* just clean the monitor flag */
385 return nlm4svc_proc_lock(rqstp, argp, resp);
389 * FREE_ALL: Release all locks and shares held by client
391 static __be32
392 nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
393 void *resp)
395 struct nlm_host *host;
397 /* Obtain client */
398 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
399 return rpc_success;
401 nlmsvc_free_host_resources(host);
402 nlmsvc_release_host(host);
403 return rpc_success;
407 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
409 static __be32
410 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
411 void *resp)
413 dprintk("lockd: SM_NOTIFY called\n");
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;
422 nlm_host_rebooted(argp);
423 return rpc_success;
427 * client sent a GRANTED_RES, let's remove the associated block
429 static __be32
430 nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp,
431 void *resp)
433 if (!nlmsvc_ops)
434 return rpc_success;
436 dprintk("lockd: GRANTED_RES called\n");
438 nlmsvc_grant_reply(&argp->cookie, argp->status);
439 return rpc_success;
444 * NLM Server procedures.
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
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
461 struct nlm_void { int dummy; };
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, \
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) */
476 struct 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),