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Linux/fs/lockd/svcproc.c

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  1 /*
  2  * linux/fs/lockd/svcproc.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 
 15 #define NLMDBG_FACILITY         NLMDBG_CLIENT
 16 
 17 #ifdef CONFIG_LOCKD_V4
 18 static __be32
 19 cast_to_nlm(__be32 status, u32 vers)
 20 {
 21         /* Note: status is assumed to be in network byte order !!! */
 22         if (vers != 4){
 23                 switch (status) {
 24                 case nlm_granted:
 25                 case nlm_lck_denied:
 26                 case nlm_lck_denied_nolocks:
 27                 case nlm_lck_blocked:
 28                 case nlm_lck_denied_grace_period:
 29                 case nlm_drop_reply:
 30                         break;
 31                 case nlm4_deadlock:
 32                         status = nlm_lck_denied;
 33                         break;
 34                 default:
 35                         status = nlm_lck_denied_nolocks;
 36                 }
 37         }
 38 
 39         return (status);
 40 }
 41 #define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
 42 #else
 43 #define cast_status(status) (status)
 44 #endif
 45 
 46 /*
 47  * Obtain client and file from arguments
 48  */
 49 static __be32
 50 nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
 51                         struct nlm_host **hostp, struct nlm_file **filp)
 52 {
 53         struct nlm_host         *host = NULL;
 54         struct nlm_file         *file = NULL;
 55         struct nlm_lock         *lock = &argp->lock;
 56         __be32                  error = 0;
 57 
 58         /* nfsd callbacks must have been installed for this procedure */
 59         if (!nlmsvc_ops)
 60                 return nlm_lck_denied_nolocks;
 61 
 62         /* Obtain host handle */
 63         if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
 64          || (argp->monitor && nsm_monitor(host) < 0))
 65                 goto no_locks;
 66         *hostp = host;
 67 
 68         /* Obtain file pointer. Not used by FREE_ALL call. */
 69         if (filp != NULL) {
 70                 error = cast_status(nlm_lookup_file(rqstp, &file, &lock->fh));
 71                 if (error != 0)
 72                         goto no_locks;
 73                 *filp = file;
 74 
 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;
 79         }
 80 
 81         return 0;
 82 
 83 no_locks:
 84         nlmsvc_release_host(host);
 85         if (error)
 86                 return error;
 87         return nlm_lck_denied_nolocks;
 88 }
 89 
 90 /*
 91  * NULL: Test for presence of service
 92  */
 93 static __be32
 94 nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 95 {
 96         dprintk("lockd: NULL          called\n");
 97         return rpc_success;
 98 }
 99 
100 /*
101  * TEST: Check for conflicting lock
102  */
103 static __be32
104 nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
105                                          struct nlm_res  *resp)
106 {
107         struct nlm_host *host;
108         struct nlm_file *file;
109         __be32 rc = rpc_success;
110 
111         dprintk("lockd: TEST          called\n");
112         resp->cookie = argp->cookie;
113 
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;
117 
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);
125 
126         nlmsvc_release_host(host);
127         nlm_release_file(file);
128         return rc;
129 }
130 
131 static __be32
132 nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
133                                          struct nlm_res  *resp)
134 {
135         struct nlm_host *host;
136         struct nlm_file *file;
137         __be32 rc = rpc_success;
138 
139         dprintk("lockd: LOCK          called\n");
140 
141         resp->cookie = argp->cookie;
142 
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;
146 
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.
151          *
152          * NB: We don't retrieve the remote host's state yet.
153          */
154         if (host->h_nsmstate && host->h_nsmstate != argp->state) {
155                 resp->status = nlm_lck_denied_nolocks;
156         } else
157 #endif
158 
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));
167 
168         nlmsvc_release_host(host);
169         nlm_release_file(file);
170         return rc;
171 }
172 
173 static __be32
174 nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
175                                            struct nlm_res  *resp)
176 {
177         struct nlm_host *host;
178         struct nlm_file *file;
179 
180         dprintk("lockd: CANCEL        called\n");
181 
182         resp->cookie = argp->cookie;
183 
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;
188         }
189 
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;
193 
194         /* Try to cancel request. */
195         resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
196 
197         dprintk("lockd: CANCEL        status %d\n", ntohl(resp->status));
198         nlmsvc_release_host(host);
199         nlm_release_file(file);
200         return rpc_success;
201 }
202 
203 /*
204  * UNLOCK: release a lock
205  */
206 static __be32
207 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
208                                            struct nlm_res  *resp)
209 {
210         struct nlm_host *host;
211         struct nlm_file *file;
212 
213         dprintk("lockd: UNLOCK        called\n");
214 
215         resp->cookie = argp->cookie;
216 
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;
221         }
222 
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;
226 
227         /* Now try to remove the lock */
228         resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
229 
230         dprintk("lockd: UNLOCK        status %d\n", ntohl(resp->status));
231         nlmsvc_release_host(host);
232         nlm_release_file(file);
233         return rpc_success;
234 }
235 
236 /*
237  * GRANTED: A server calls us to tell that a process' lock request
238  * was granted
239  */
240 static __be32
241 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
242                                             struct nlm_res  *resp)
243 {
244         resp->cookie = argp->cookie;
245 
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;
250 }
251 
252 /*
253  * This is the generic lockd callback for async RPC calls
254  */
255 static void nlmsvc_callback_exit(struct rpc_task *task, void *data)
256 {
257         dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
258                         -task->tk_status);
259 }
260 
261 void nlmsvc_release_call(struct nlm_rqst *call)
262 {
263         if (!atomic_dec_and_test(&call->a_count))
264                 return;
265         nlmsvc_release_host(call->a_host);
266         kfree(call);
267 }
268 
269 static void nlmsvc_callback_release(void *data)
270 {
271         nlmsvc_release_call(data);
272 }
273 
274 static const struct rpc_call_ops nlmsvc_callback_ops = {
275         .rpc_call_done = nlmsvc_callback_exit,
276         .rpc_release = nlmsvc_callback_release,
277 };
278 
279 /*
280  * `Async' versions of the above service routines. They aren't really,
281  * because we send the callback before the reply proper. I hope this
282  * doesn't break any clients.
283  */
284 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
285                 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res  *))
286 {
287         struct nlm_host *host;
288         struct nlm_rqst *call;
289         __be32 stat;
290 
291         host = nlmsvc_lookup_host(rqstp,
292                                   argp->lock.caller,
293                                   argp->lock.len);
294         if (host == NULL)
295                 return rpc_system_err;
296 
297         call = nlm_alloc_call(host);
298         if (call == NULL)
299                 return rpc_system_err;
300 
301         stat = func(rqstp, argp, &call->a_res);
302         if (stat != 0) {
303                 nlmsvc_release_call(call);
304                 return stat;
305         }
306 
307         call->a_flags = RPC_TASK_ASYNC;
308         if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
309                 return rpc_system_err;
310         return rpc_success;
311 }
312 
313 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
314                                              void            *resp)
315 {
316         dprintk("lockd: TEST_MSG      called\n");
317         return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
318 }
319 
320 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
321                                              void            *resp)
322 {
323         dprintk("lockd: LOCK_MSG      called\n");
324         return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
325 }
326 
327 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
328                                                void            *resp)
329 {
330         dprintk("lockd: CANCEL_MSG    called\n");
331         return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
332 }
333 
334 static __be32
335 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
336                                                void            *resp)
337 {
338         dprintk("lockd: UNLOCK_MSG    called\n");
339         return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
340 }
341 
342 static __be32
343 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
344                                                 void            *resp)
345 {
346         dprintk("lockd: GRANTED_MSG   called\n");
347         return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
348 }
349 
350 /*
351  * SHARE: create a DOS share or alter existing share.
352  */
353 static __be32
354 nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
355                                           struct nlm_res  *resp)
356 {
357         struct nlm_host *host;
358         struct nlm_file *file;
359 
360         dprintk("lockd: SHARE         called\n");
361 
362         resp->cookie = argp->cookie;
363 
364         /* Don't accept new lock requests during grace period */
365         if (locks_in_grace() && !argp->reclaim) {
366                 resp->status = nlm_lck_denied_grace_period;
367                 return rpc_success;
368         }
369 
370         /* Obtain client and file */
371         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
372                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
373 
374         /* Now try to create the share */
375         resp->status = cast_status(nlmsvc_share_file(host, file, argp));
376 
377         dprintk("lockd: SHARE         status %d\n", ntohl(resp->status));
378         nlmsvc_release_host(host);
379         nlm_release_file(file);
380         return rpc_success;
381 }
382 
383 /*
384  * UNSHARE: Release a DOS share.
385  */
386 static __be32
387 nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
388                                             struct nlm_res  *resp)
389 {
390         struct nlm_host *host;
391         struct nlm_file *file;
392 
393         dprintk("lockd: UNSHARE       called\n");
394 
395         resp->cookie = argp->cookie;
396 
397         /* Don't accept requests during grace period */
398         if (locks_in_grace()) {
399                 resp->status = nlm_lck_denied_grace_period;
400                 return rpc_success;
401         }
402 
403         /* Obtain client and file */
404         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
405                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
406 
407         /* Now try to unshare the file */
408         resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
409 
410         dprintk("lockd: UNSHARE       status %d\n", ntohl(resp->status));
411         nlmsvc_release_host(host);
412         nlm_release_file(file);
413         return rpc_success;
414 }
415 
416 /*
417  * NM_LOCK: Create an unmonitored lock
418  */
419 static __be32
420 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
421                                             struct nlm_res  *resp)
422 {
423         dprintk("lockd: NM_LOCK       called\n");
424 
425         argp->monitor = 0;              /* just clean the monitor flag */
426         return nlmsvc_proc_lock(rqstp, argp, resp);
427 }
428 
429 /*
430  * FREE_ALL: Release all locks and shares held by client
431  */
432 static __be32
433 nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
434                                              void            *resp)
435 {
436         struct nlm_host *host;
437 
438         /* Obtain client */
439         if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
440                 return rpc_success;
441 
442         nlmsvc_free_host_resources(host);
443         nlmsvc_release_host(host);
444         return rpc_success;
445 }
446 
447 /*
448  * SM_NOTIFY: private callback from statd (not part of official NLM proto)
449  */
450 static __be32
451 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
452                                               void              *resp)
453 {
454         dprintk("lockd: SM_NOTIFY     called\n");
455 
456         if (!nlm_privileged_requester(rqstp)) {
457                 char buf[RPC_MAX_ADDRBUFLEN];
458                 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
459                                 svc_print_addr(rqstp, buf, sizeof(buf)));
460                 return rpc_system_err;
461         }
462 
463         nlm_host_rebooted(argp);
464         return rpc_success;
465 }
466 
467 /*
468  * client sent a GRANTED_RES, let's remove the associated block
469  */
470 static __be32
471 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
472                                                 void            *resp)
473 {
474         if (!nlmsvc_ops)
475                 return rpc_success;
476 
477         dprintk("lockd: GRANTED_RES   called\n");
478 
479         nlmsvc_grant_reply(&argp->cookie, argp->status);
480         return rpc_success;
481 }
482 
483 /*
484  * NLM Server procedures.
485  */
486 
487 #define nlmsvc_encode_norep     nlmsvc_encode_void
488 #define nlmsvc_decode_norep     nlmsvc_decode_void
489 #define nlmsvc_decode_testres   nlmsvc_decode_void
490 #define nlmsvc_decode_lockres   nlmsvc_decode_void
491 #define nlmsvc_decode_unlockres nlmsvc_decode_void
492 #define nlmsvc_decode_cancelres nlmsvc_decode_void
493 #define nlmsvc_decode_grantedres        nlmsvc_decode_void
494 
495 #define nlmsvc_proc_none        nlmsvc_proc_null
496 #define nlmsvc_proc_test_res    nlmsvc_proc_null
497 #define nlmsvc_proc_lock_res    nlmsvc_proc_null
498 #define nlmsvc_proc_cancel_res  nlmsvc_proc_null
499 #define nlmsvc_proc_unlock_res  nlmsvc_proc_null
500 
501 struct nlm_void                 { int dummy; };
502 
503 #define PROC(name, xargt, xrest, argt, rest, respsize)  \
504  { .pc_func     = (svc_procfunc) nlmsvc_proc_##name,    \
505    .pc_decode   = (kxdrproc_t) nlmsvc_decode_##xargt,   \
506    .pc_encode   = (kxdrproc_t) nlmsvc_encode_##xrest,   \
507    .pc_release  = NULL,                                 \
508    .pc_argsize  = sizeof(struct nlm_##argt),            \
509    .pc_ressize  = sizeof(struct nlm_##rest),            \
510    .pc_xdrressize = respsize,                           \
511  }
512 
513 #define Ck      (1+XDR_QUADLEN(NLM_MAXCOOKIELEN))       /* cookie */
514 #define St      1                               /* status */
515 #define No      (1+1024/4)                      /* Net Obj */
516 #define Rg      2                               /* range - offset + size */
517 
518 struct svc_procedure            nlmsvc_procedures[] = {
519   PROC(null,            void,           void,           void,   void, 1),
520   PROC(test,            testargs,       testres,        args,   res, Ck+St+2+No+Rg),
521   PROC(lock,            lockargs,       res,            args,   res, Ck+St),
522   PROC(cancel,          cancargs,       res,            args,   res, Ck+St),
523   PROC(unlock,          unlockargs,     res,            args,   res, Ck+St),
524   PROC(granted,         testargs,       res,            args,   res, Ck+St),
525   PROC(test_msg,        testargs,       norep,          args,   void, 1),
526   PROC(lock_msg,        lockargs,       norep,          args,   void, 1),
527   PROC(cancel_msg,      cancargs,       norep,          args,   void, 1),
528   PROC(unlock_msg,      unlockargs,     norep,          args,   void, 1),
529   PROC(granted_msg,     testargs,       norep,          args,   void, 1),
530   PROC(test_res,        testres,        norep,          res,    void, 1),
531   PROC(lock_res,        lockres,        norep,          res,    void, 1),
532   PROC(cancel_res,      cancelres,      norep,          res,    void, 1),
533   PROC(unlock_res,      unlockres,      norep,          res,    void, 1),
534   PROC(granted_res,     res,            norep,          res,    void, 1),
535   /* statd callback */
536   PROC(sm_notify,       reboot,         void,           reboot, void, 1),
537   PROC(none,            void,           void,           void,   void, 1),
538   PROC(none,            void,           void,           void,   void, 1),
539   PROC(none,            void,           void,           void,   void, 1),
540   PROC(share,           shareargs,      shareres,       args,   res, Ck+St+1),
541   PROC(unshare,         shareargs,      shareres,       args,   res, Ck+St+1),
542   PROC(nm_lock,         lockargs,       res,            args,   res, Ck+St),
543   PROC(free_all,        notify,         void,           args,   void, 0),
544 
545 };
546 

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