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Linux/fs/lockd/svc4proc.c

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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 #include <linux/sunrpc/svc_xprt.h>
 15 
 16 #define NLMDBG_FACILITY         NLMDBG_CLIENT
 17 
 18 /*
 19  * Obtain client and file from arguments
 20  */
 21 static __be32
 22 nlm4svc_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 
 54 no_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  */
 64 static __be32
 65 nlm4svc_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  */
 74 static __be32
 75 nlm4svc_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 
101 static __be32
102 nlm4svc_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 
143 static __be32
144 nlm4svc_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  */
176 static __be32
177 nlm4svc_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  */
210 static __be32
211 nlm4svc_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  */
225 static 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 
231 static void nlm4svc_callback_release(void *data)
232 {
233         nlmsvc_release_call(data);
234 }
235 
236 static 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  */
246 static __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 
276 static __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 
283 static __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 
290 static __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 
297 static __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 
304 static __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  */
314 static __be32
315 nlm4svc_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  */
347 static __be32
348 nlm4svc_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  */
380 static __be32
381 nlm4svc_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  */
393 static __be32
394 nlm4svc_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  */
411 static __be32
412 nlm4svc_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  */
431 static __be32
432 nlm4svc_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 
463 struct 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) */
478 struct 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 };
506 

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