USB: kill BKL in skeleton driver
[linux-2.6/mini2440.git] / fs / lockd / svcproc.c
blob31cb48425733033529d4a7e7ba63014773b1226b
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/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>
19 #include <linux/lockd/sm_inter.h>
22 #define NLMDBG_FACILITY NLMDBG_CLIENT
24 #ifdef CONFIG_LOCKD_V4
25 static __be32
26 cast_to_nlm(__be32 status, u32 vers)
28 /* Note: status is assumed to be in network byte order !!! */
29 if (vers != 4){
30 switch (status) {
31 case nlm_granted:
32 case nlm_lck_denied:
33 case nlm_lck_denied_nolocks:
34 case nlm_lck_blocked:
35 case nlm_lck_denied_grace_period:
36 break;
37 case nlm4_deadlock:
38 status = nlm_lck_denied;
39 break;
40 default:
41 status = nlm_lck_denied_nolocks;
45 return (status);
47 #define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
48 #else
49 #define cast_status(status) (status)
50 #endif
53 * Obtain client and file from arguments
55 static __be32
56 nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
57 struct nlm_host **hostp, struct nlm_file **filp)
59 struct nlm_host *host = NULL;
60 struct nlm_file *file = NULL;
61 struct nlm_lock *lock = &argp->lock;
62 __be32 error = 0;
64 /* nfsd callbacks must have been installed for this procedure */
65 if (!nlmsvc_ops)
66 return nlm_lck_denied_nolocks;
68 /* Obtain host handle */
69 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
70 || (argp->monitor && nsm_monitor(host) < 0))
71 goto no_locks;
72 *hostp = host;
74 /* Obtain file pointer. Not used by FREE_ALL call. */
75 if (filp != NULL) {
76 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
77 goto no_locks;
78 *filp = file;
80 /* Set up the missing parts of the file_lock structure */
81 lock->fl.fl_file = file->f_file;
82 lock->fl.fl_owner = (fl_owner_t) host;
83 lock->fl.fl_lmops = &nlmsvc_lock_operations;
86 return 0;
88 no_locks:
89 if (host)
90 nlm_release_host(host);
91 if (error)
92 return error;
93 return nlm_lck_denied_nolocks;
97 * NULL: Test for presence of service
99 static __be32
100 nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
102 dprintk("lockd: NULL called\n");
103 return rpc_success;
107 * TEST: Check for conflicting lock
109 static __be32
110 nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
111 struct nlm_res *resp)
113 struct nlm_host *host;
114 struct nlm_file *file;
116 dprintk("lockd: TEST called\n");
117 resp->cookie = argp->cookie;
119 /* Don't accept test requests during grace period */
120 if (nlmsvc_grace_period) {
121 resp->status = nlm_lck_denied_grace_period;
122 return rpc_success;
125 /* Obtain client and file */
126 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
127 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
129 /* Now check for conflicting locks */
130 resp->status = cast_status(nlmsvc_testlock(file, &argp->lock, &resp->lock));
132 dprintk("lockd: TEST status %d vers %d\n",
133 ntohl(resp->status), rqstp->rq_vers);
134 nlm_release_host(host);
135 nlm_release_file(file);
136 return rpc_success;
139 static __be32
140 nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
141 struct nlm_res *resp)
143 struct nlm_host *host;
144 struct nlm_file *file;
146 dprintk("lockd: LOCK called\n");
148 resp->cookie = argp->cookie;
150 /* Don't accept new lock requests during grace period */
151 if (nlmsvc_grace_period && !argp->reclaim) {
152 resp->status = nlm_lck_denied_grace_period;
153 return rpc_success;
156 /* Obtain client and file */
157 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
158 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
160 #if 0
161 /* If supplied state doesn't match current state, we assume it's
162 * an old request that time-warped somehow. Any error return would
163 * do in this case because it's irrelevant anyway.
165 * NB: We don't retrieve the remote host's state yet.
167 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
168 resp->status = nlm_lck_denied_nolocks;
169 } else
170 #endif
172 /* Now try to lock the file */
173 resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock,
174 argp->block, &argp->cookie));
176 dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
177 nlm_release_host(host);
178 nlm_release_file(file);
179 return rpc_success;
182 static __be32
183 nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
184 struct nlm_res *resp)
186 struct nlm_host *host;
187 struct nlm_file *file;
189 dprintk("lockd: CANCEL called\n");
191 resp->cookie = argp->cookie;
193 /* Don't accept requests during grace period */
194 if (nlmsvc_grace_period) {
195 resp->status = nlm_lck_denied_grace_period;
196 return rpc_success;
199 /* Obtain client and file */
200 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
201 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
203 /* Try to cancel request. */
204 resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
206 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
207 nlm_release_host(host);
208 nlm_release_file(file);
209 return rpc_success;
213 * UNLOCK: release a lock
215 static __be32
216 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
217 struct nlm_res *resp)
219 struct nlm_host *host;
220 struct nlm_file *file;
222 dprintk("lockd: UNLOCK called\n");
224 resp->cookie = argp->cookie;
226 /* Don't accept new lock requests during grace period */
227 if (nlmsvc_grace_period) {
228 resp->status = nlm_lck_denied_grace_period;
229 return rpc_success;
232 /* Obtain client and file */
233 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
234 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
236 /* Now try to remove the lock */
237 resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
239 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
240 nlm_release_host(host);
241 nlm_release_file(file);
242 return rpc_success;
246 * GRANTED: A server calls us to tell that a process' lock request
247 * was granted
249 static __be32
250 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
251 struct nlm_res *resp)
253 resp->cookie = argp->cookie;
255 dprintk("lockd: GRANTED called\n");
256 resp->status = nlmclnt_grant(svc_addr_in(rqstp), &argp->lock);
257 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
258 return rpc_success;
262 * This is the generic lockd callback for async RPC calls
264 static void nlmsvc_callback_exit(struct rpc_task *task, void *data)
266 dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
267 -task->tk_status);
270 static void nlmsvc_callback_release(void *data)
272 nlm_release_call(data);
275 static const struct rpc_call_ops nlmsvc_callback_ops = {
276 .rpc_call_done = nlmsvc_callback_exit,
277 .rpc_release = nlmsvc_callback_release,
281 * `Async' versions of the above service routines. They aren't really,
282 * because we send the callback before the reply proper. I hope this
283 * doesn't break any clients.
285 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
286 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *))
288 struct nlm_host *host;
289 struct nlm_rqst *call;
290 __be32 stat;
292 host = nlmsvc_lookup_host(rqstp,
293 argp->lock.caller,
294 argp->lock.len);
295 if (host == NULL)
296 return rpc_system_err;
298 call = nlm_alloc_call(host);
299 if (call == NULL)
300 return rpc_system_err;
302 stat = func(rqstp, argp, &call->a_res);
303 if (stat != 0) {
304 nlm_release_call(call);
305 return stat;
308 call->a_flags = RPC_TASK_ASYNC;
309 if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
310 return rpc_system_err;
311 return rpc_success;
314 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
315 void *resp)
317 dprintk("lockd: TEST_MSG called\n");
318 return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
321 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
322 void *resp)
324 dprintk("lockd: LOCK_MSG called\n");
325 return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
328 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
329 void *resp)
331 dprintk("lockd: CANCEL_MSG called\n");
332 return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
335 static __be32
336 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
337 void *resp)
339 dprintk("lockd: UNLOCK_MSG called\n");
340 return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
343 static __be32
344 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
345 void *resp)
347 dprintk("lockd: GRANTED_MSG called\n");
348 return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
352 * SHARE: create a DOS share or alter existing share.
354 static __be32
355 nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
356 struct nlm_res *resp)
358 struct nlm_host *host;
359 struct nlm_file *file;
361 dprintk("lockd: SHARE called\n");
363 resp->cookie = argp->cookie;
365 /* Don't accept new lock requests during grace period */
366 if (nlmsvc_grace_period && !argp->reclaim) {
367 resp->status = nlm_lck_denied_grace_period;
368 return rpc_success;
371 /* Obtain client and file */
372 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
373 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
375 /* Now try to create the share */
376 resp->status = cast_status(nlmsvc_share_file(host, file, argp));
378 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
379 nlm_release_host(host);
380 nlm_release_file(file);
381 return rpc_success;
385 * UNSHARE: Release a DOS share.
387 static __be32
388 nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
389 struct nlm_res *resp)
391 struct nlm_host *host;
392 struct nlm_file *file;
394 dprintk("lockd: UNSHARE called\n");
396 resp->cookie = argp->cookie;
398 /* Don't accept requests during grace period */
399 if (nlmsvc_grace_period) {
400 resp->status = nlm_lck_denied_grace_period;
401 return rpc_success;
404 /* Obtain client and file */
405 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
406 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
408 /* Now try to unshare the file */
409 resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
411 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
412 nlm_release_host(host);
413 nlm_release_file(file);
414 return rpc_success;
418 * NM_LOCK: Create an unmonitored lock
420 static __be32
421 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
422 struct nlm_res *resp)
424 dprintk("lockd: NM_LOCK called\n");
426 argp->monitor = 0; /* just clean the monitor flag */
427 return nlmsvc_proc_lock(rqstp, argp, resp);
431 * FREE_ALL: Release all locks and shares held by client
433 static __be32
434 nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
435 void *resp)
437 struct nlm_host *host;
439 /* Obtain client */
440 if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
441 return rpc_success;
443 nlmsvc_free_host_resources(host);
444 nlm_release_host(host);
445 return rpc_success;
449 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
451 static __be32
452 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
453 void *resp)
455 struct sockaddr_in saddr;
457 memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr));
459 dprintk("lockd: SM_NOTIFY called\n");
460 if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
461 || ntohs(saddr.sin_port) >= 1024) {
462 char buf[RPC_MAX_ADDRBUFLEN];
463 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
464 svc_print_addr(rqstp, buf, sizeof(buf)));
465 return rpc_system_err;
468 /* Obtain the host pointer for this NFS server and try to
469 * reclaim all locks we hold on this server.
471 memset(&saddr, 0, sizeof(saddr));
472 saddr.sin_addr.s_addr = argp->addr;
473 nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);
475 return rpc_success;
479 * client sent a GRANTED_RES, let's remove the associated block
481 static __be32
482 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp,
483 void *resp)
485 if (!nlmsvc_ops)
486 return rpc_success;
488 dprintk("lockd: GRANTED_RES called\n");
490 nlmsvc_grant_reply(&argp->cookie, argp->status);
491 return rpc_success;
495 * NLM Server procedures.
498 #define nlmsvc_encode_norep nlmsvc_encode_void
499 #define nlmsvc_decode_norep nlmsvc_decode_void
500 #define nlmsvc_decode_testres nlmsvc_decode_void
501 #define nlmsvc_decode_lockres nlmsvc_decode_void
502 #define nlmsvc_decode_unlockres nlmsvc_decode_void
503 #define nlmsvc_decode_cancelres nlmsvc_decode_void
504 #define nlmsvc_decode_grantedres nlmsvc_decode_void
506 #define nlmsvc_proc_none nlmsvc_proc_null
507 #define nlmsvc_proc_test_res nlmsvc_proc_null
508 #define nlmsvc_proc_lock_res nlmsvc_proc_null
509 #define nlmsvc_proc_cancel_res nlmsvc_proc_null
510 #define nlmsvc_proc_unlock_res nlmsvc_proc_null
512 struct nlm_void { int dummy; };
514 #define PROC(name, xargt, xrest, argt, rest, respsize) \
515 { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \
516 .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \
517 .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \
518 .pc_release = NULL, \
519 .pc_argsize = sizeof(struct nlm_##argt), \
520 .pc_ressize = sizeof(struct nlm_##rest), \
521 .pc_xdrressize = respsize, \
524 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
525 #define St 1 /* status */
526 #define No (1+1024/4) /* Net Obj */
527 #define Rg 2 /* range - offset + size */
529 struct svc_procedure nlmsvc_procedures[] = {
530 PROC(null, void, void, void, void, 1),
531 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
532 PROC(lock, lockargs, res, args, res, Ck+St),
533 PROC(cancel, cancargs, res, args, res, Ck+St),
534 PROC(unlock, unlockargs, res, args, res, Ck+St),
535 PROC(granted, testargs, res, args, res, Ck+St),
536 PROC(test_msg, testargs, norep, args, void, 1),
537 PROC(lock_msg, lockargs, norep, args, void, 1),
538 PROC(cancel_msg, cancargs, norep, args, void, 1),
539 PROC(unlock_msg, unlockargs, norep, args, void, 1),
540 PROC(granted_msg, testargs, norep, args, void, 1),
541 PROC(test_res, testres, norep, res, void, 1),
542 PROC(lock_res, lockres, norep, res, void, 1),
543 PROC(cancel_res, cancelres, norep, res, void, 1),
544 PROC(unlock_res, unlockres, norep, res, void, 1),
545 PROC(granted_res, res, norep, res, void, 1),
546 /* statd callback */
547 PROC(sm_notify, reboot, void, reboot, void, 1),
548 PROC(none, void, void, void, void, 1),
549 PROC(none, void, void, void, void, 1),
550 PROC(none, void, void, void, void, 1),
551 PROC(share, shareargs, shareres, args, res, Ck+St+1),
552 PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
553 PROC(nm_lock, lockargs, res, args, res, Ck+St),
554 PROC(free_all, notify, void, args, void, 0),