ACPI: pci_root: simplify list traversals
[linux-2.6/linux-acpi-2.6.git] / fs / lockd / svc4proc.c
blob1725037374c595e3919f2cbb566f33593fd388f1
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/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>
20 #define NLMDBG_FACILITY NLMDBG_CLIENT
23 * Obtain client and file from arguments
25 static __be32
26 nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
27 struct nlm_host **hostp, struct nlm_file **filp)
29 struct nlm_host *host = NULL;
30 struct nlm_file *file = NULL;
31 struct nlm_lock *lock = &argp->lock;
32 __be32 error = 0;
34 /* nfsd callbacks must have been installed for this procedure */
35 if (!nlmsvc_ops)
36 return nlm_lck_denied_nolocks;
38 /* Obtain host handle */
39 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
40 || (argp->monitor && nsm_monitor(host) < 0))
41 goto no_locks;
42 *hostp = host;
44 /* Obtain file pointer. Not used by FREE_ALL call. */
45 if (filp != NULL) {
46 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
47 goto no_locks;
48 *filp = file;
50 /* Set up the missing parts of the file_lock structure */
51 lock->fl.fl_file = file->f_file;
52 lock->fl.fl_owner = (fl_owner_t) host;
53 lock->fl.fl_lmops = &nlmsvc_lock_operations;
56 return 0;
58 no_locks:
59 nlm_release_host(host);
60 if (error)
61 return error;
62 return nlm_lck_denied_nolocks;
66 * NULL: Test for presence of service
68 static __be32
69 nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
71 dprintk("lockd: NULL called\n");
72 return rpc_success;
76 * TEST: Check for conflicting lock
78 static __be32
79 nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
80 struct nlm_res *resp)
82 struct nlm_host *host;
83 struct nlm_file *file;
84 __be32 rc = rpc_success;
86 dprintk("lockd: TEST4 called\n");
87 resp->cookie = argp->cookie;
89 /* Obtain client and file */
90 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
91 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
93 /* Now check for conflicting locks */
94 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
95 if (resp->status == nlm_drop_reply)
96 rc = rpc_drop_reply;
97 else
98 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
100 nlm_release_host(host);
101 nlm_release_file(file);
102 return rc;
105 static __be32
106 nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
107 struct nlm_res *resp)
109 struct nlm_host *host;
110 struct nlm_file *file;
111 __be32 rc = rpc_success;
113 dprintk("lockd: LOCK called\n");
115 resp->cookie = argp->cookie;
117 /* Obtain client and file */
118 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
119 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
121 #if 0
122 /* If supplied state doesn't match current state, we assume it's
123 * an old request that time-warped somehow. Any error return would
124 * do in this case because it's irrelevant anyway.
126 * NB: We don't retrieve the remote host's state yet.
128 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
129 resp->status = nlm_lck_denied_nolocks;
130 } else
131 #endif
133 /* Now try to lock the file */
134 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
135 argp->block, &argp->cookie,
136 argp->reclaim);
137 if (resp->status == nlm_drop_reply)
138 rc = rpc_drop_reply;
139 else
140 dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
142 nlm_release_host(host);
143 nlm_release_file(file);
144 return rc;
147 static __be32
148 nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
149 struct nlm_res *resp)
151 struct nlm_host *host;
152 struct nlm_file *file;
154 dprintk("lockd: CANCEL called\n");
156 resp->cookie = argp->cookie;
158 /* Don't accept requests during grace period */
159 if (locks_in_grace()) {
160 resp->status = nlm_lck_denied_grace_period;
161 return rpc_success;
164 /* Obtain client and file */
165 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
166 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
168 /* Try to cancel request. */
169 resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
171 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
172 nlm_release_host(host);
173 nlm_release_file(file);
174 return rpc_success;
178 * UNLOCK: release a lock
180 static __be32
181 nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
182 struct nlm_res *resp)
184 struct nlm_host *host;
185 struct nlm_file *file;
187 dprintk("lockd: UNLOCK called\n");
189 resp->cookie = argp->cookie;
191 /* Don't accept new lock requests during grace period */
192 if (locks_in_grace()) {
193 resp->status = nlm_lck_denied_grace_period;
194 return rpc_success;
197 /* Obtain client and file */
198 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
199 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
201 /* Now try to remove the lock */
202 resp->status = nlmsvc_unlock(file, &argp->lock);
204 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
205 nlm_release_host(host);
206 nlm_release_file(file);
207 return rpc_success;
211 * GRANTED: A server calls us to tell that a process' lock request
212 * was granted
214 static __be32
215 nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
216 struct nlm_res *resp)
218 resp->cookie = argp->cookie;
220 dprintk("lockd: GRANTED called\n");
221 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
222 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
223 return rpc_success;
227 * This is the generic lockd callback for async RPC calls
229 static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
231 dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
232 -task->tk_status);
235 static void nlm4svc_callback_release(void *data)
237 lock_kernel();
238 nlm_release_call(data);
239 unlock_kernel();
242 static const struct rpc_call_ops nlm4svc_callback_ops = {
243 .rpc_call_done = nlm4svc_callback_exit,
244 .rpc_release = nlm4svc_callback_release,
248 * `Async' versions of the above service routines. They aren't really,
249 * because we send the callback before the reply proper. I hope this
250 * doesn't break any clients.
252 static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
253 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *))
255 struct nlm_host *host;
256 struct nlm_rqst *call;
257 __be32 stat;
259 host = nlmsvc_lookup_host(rqstp,
260 argp->lock.caller,
261 argp->lock.len);
262 if (host == NULL)
263 return rpc_system_err;
265 call = nlm_alloc_call(host);
266 if (call == NULL)
267 return rpc_system_err;
269 stat = func(rqstp, argp, &call->a_res);
270 if (stat != 0) {
271 nlm_release_call(call);
272 return stat;
275 call->a_flags = RPC_TASK_ASYNC;
276 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
277 return rpc_system_err;
278 return rpc_success;
281 static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
282 void *resp)
284 dprintk("lockd: TEST_MSG called\n");
285 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
288 static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
289 void *resp)
291 dprintk("lockd: LOCK_MSG called\n");
292 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
295 static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
296 void *resp)
298 dprintk("lockd: CANCEL_MSG called\n");
299 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
302 static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
303 void *resp)
305 dprintk("lockd: UNLOCK_MSG called\n");
306 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
309 static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
310 void *resp)
312 dprintk("lockd: GRANTED_MSG called\n");
313 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
317 * SHARE: create a DOS share or alter existing share.
319 static __be32
320 nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
321 struct nlm_res *resp)
323 struct nlm_host *host;
324 struct nlm_file *file;
326 dprintk("lockd: SHARE called\n");
328 resp->cookie = argp->cookie;
330 /* Don't accept new lock requests during grace period */
331 if (locks_in_grace() && !argp->reclaim) {
332 resp->status = nlm_lck_denied_grace_period;
333 return rpc_success;
336 /* Obtain client and file */
337 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
338 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
340 /* Now try to create the share */
341 resp->status = nlmsvc_share_file(host, file, argp);
343 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
344 nlm_release_host(host);
345 nlm_release_file(file);
346 return rpc_success;
350 * UNSHARE: Release a DOS share.
352 static __be32
353 nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
354 struct nlm_res *resp)
356 struct nlm_host *host;
357 struct nlm_file *file;
359 dprintk("lockd: UNSHARE called\n");
361 resp->cookie = argp->cookie;
363 /* Don't accept requests during grace period */
364 if (locks_in_grace()) {
365 resp->status = nlm_lck_denied_grace_period;
366 return rpc_success;
369 /* Obtain client and file */
370 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
371 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
373 /* Now try to lock the file */
374 resp->status = nlmsvc_unshare_file(host, file, argp);
376 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
377 nlm_release_host(host);
378 nlm_release_file(file);
379 return rpc_success;
383 * NM_LOCK: Create an unmonitored lock
385 static __be32
386 nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
387 struct nlm_res *resp)
389 dprintk("lockd: NM_LOCK called\n");
391 argp->monitor = 0; /* just clean the monitor flag */
392 return nlm4svc_proc_lock(rqstp, argp, resp);
396 * FREE_ALL: Release all locks and shares held by client
398 static __be32
399 nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
400 void *resp)
402 struct nlm_host *host;
404 /* Obtain client */
405 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
406 return rpc_success;
408 nlmsvc_free_host_resources(host);
409 nlm_release_host(host);
410 return rpc_success;
414 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
416 static __be32
417 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
418 void *resp)
420 dprintk("lockd: SM_NOTIFY called\n");
422 if (!nlm_privileged_requester(rqstp)) {
423 char buf[RPC_MAX_ADDRBUFLEN];
424 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
425 svc_print_addr(rqstp, buf, sizeof(buf)));
426 return rpc_system_err;
429 nlm_host_rebooted(argp);
430 return rpc_success;
434 * client sent a GRANTED_RES, let's remove the associated block
436 static __be32
437 nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp,
438 void *resp)
440 if (!nlmsvc_ops)
441 return rpc_success;
443 dprintk("lockd: GRANTED_RES called\n");
445 nlmsvc_grant_reply(&argp->cookie, argp->status);
446 return rpc_success;
451 * NLM Server procedures.
454 #define nlm4svc_encode_norep nlm4svc_encode_void
455 #define nlm4svc_decode_norep nlm4svc_decode_void
456 #define nlm4svc_decode_testres nlm4svc_decode_void
457 #define nlm4svc_decode_lockres nlm4svc_decode_void
458 #define nlm4svc_decode_unlockres nlm4svc_decode_void
459 #define nlm4svc_decode_cancelres nlm4svc_decode_void
460 #define nlm4svc_decode_grantedres nlm4svc_decode_void
462 #define nlm4svc_proc_none nlm4svc_proc_null
463 #define nlm4svc_proc_test_res nlm4svc_proc_null
464 #define nlm4svc_proc_lock_res nlm4svc_proc_null
465 #define nlm4svc_proc_cancel_res nlm4svc_proc_null
466 #define nlm4svc_proc_unlock_res nlm4svc_proc_null
468 struct nlm_void { int dummy; };
470 #define PROC(name, xargt, xrest, argt, rest, respsize) \
471 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
472 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
473 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
474 .pc_release = NULL, \
475 .pc_argsize = sizeof(struct nlm_##argt), \
476 .pc_ressize = sizeof(struct nlm_##rest), \
477 .pc_xdrressize = respsize, \
479 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
480 #define No (1+1024/4) /* netobj */
481 #define St 1 /* status */
482 #define Rg 4 /* range (offset + length) */
483 struct svc_procedure nlmsvc_procedures4[] = {
484 PROC(null, void, void, void, void, 1),
485 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
486 PROC(lock, lockargs, res, args, res, Ck+St),
487 PROC(cancel, cancargs, res, args, res, Ck+St),
488 PROC(unlock, unlockargs, res, args, res, Ck+St),
489 PROC(granted, testargs, res, args, res, Ck+St),
490 PROC(test_msg, testargs, norep, args, void, 1),
491 PROC(lock_msg, lockargs, norep, args, void, 1),
492 PROC(cancel_msg, cancargs, norep, args, void, 1),
493 PROC(unlock_msg, unlockargs, norep, args, void, 1),
494 PROC(granted_msg, testargs, norep, args, void, 1),
495 PROC(test_res, testres, norep, res, void, 1),
496 PROC(lock_res, lockres, norep, res, void, 1),
497 PROC(cancel_res, cancelres, norep, res, void, 1),
498 PROC(unlock_res, unlockres, norep, res, void, 1),
499 PROC(granted_res, res, norep, res, void, 1),
500 /* statd callback */
501 PROC(sm_notify, reboot, void, reboot, void, 1),
502 PROC(none, void, void, void, void, 0),
503 PROC(none, void, void, void, void, 0),
504 PROC(none, void, void, void, void, 0),
505 PROC(share, shareargs, shareres, args, res, Ck+St+1),
506 PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
507 PROC(nm_lock, lockargs, res, args, res, Ck+St),
508 PROC(free_all, notify, void, args, void, 1),