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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/slab.h>
 13 #include <linux/smp_lock.h>
 14 #include <linux/in.h>
 15 #include <linux/sunrpc/svc.h>
 16 #include <linux/sunrpc/clnt.h>
 17 #include <linux/nfsd/nfsd.h>
 18 #include <linux/lockd/lockd.h>
 19 #include <linux/lockd/share.h>
 20 
 21 #define NLMDBG_FACILITY         NLMDBG_CLIENT
 22 
 23 #ifdef CONFIG_LOCKD_V4
 24 static __be32
 25 cast_to_nlm(__be32 status, u32 vers)
 26 {
 27         /* Note: status is assumed to be in network byte order !!! */
 28         if (vers != 4){
 29                 switch (status) {
 30                 case nlm_granted:
 31                 case nlm_lck_denied:
 32                 case nlm_lck_denied_nolocks:
 33                 case nlm_lck_blocked:
 34                 case nlm_lck_denied_grace_period:
 35                 case nlm_drop_reply:
 36                         break;
 37                 case nlm4_deadlock:
 38                         status = nlm_lck_denied;
 39                         break;
 40                 default:
 41                         status = nlm_lck_denied_nolocks;
 42                 }
 43         }
 44 
 45         return (status);
 46 }
 47 #define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
 48 #else
 49 #define cast_status(status) (status)
 50 #endif
 51 
 52 /*
 53  * Obtain client and file from arguments
 54  */
 55 static __be32
 56 nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
 57                         struct nlm_host **hostp, struct nlm_file **filp)
 58 {
 59         struct nlm_host         *host = NULL;
 60         struct nlm_file         *file = NULL;
 61         struct nlm_lock         *lock = &argp->lock;
 62         __be32                  error = 0;
 63 
 64         /* nfsd callbacks must have been installed for this procedure */
 65         if (!nlmsvc_ops)
 66                 return nlm_lck_denied_nolocks;
 67 
 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;
 73 
 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;
 79 
 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;
 84         }
 85 
 86         return 0;
 87 
 88 no_locks:
 89         nlm_release_host(host);
 90         if (error)
 91                 return error;
 92         return nlm_lck_denied_nolocks;
 93 }
 94 
 95 /*
 96  * NULL: Test for presence of service
 97  */
 98 static __be32
 99 nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
100 {
101         dprintk("lockd: NULL          called\n");
102         return rpc_success;
103 }
104 
105 /*
106  * TEST: Check for conflicting lock
107  */
108 static __be32
109 nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
110                                          struct nlm_res  *resp)
111 {
112         struct nlm_host *host;
113         struct nlm_file *file;
114         __be32 rc = rpc_success;
115 
116         dprintk("lockd: TEST          called\n");
117         resp->cookie = argp->cookie;
118 
119         /* Obtain client and file */
120         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
121                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
122 
123         /* Now check for conflicting locks */
124         resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
125         if (resp->status == nlm_drop_reply)
126                 rc = rpc_drop_reply;
127         else
128                 dprintk("lockd: TEST          status %d vers %d\n",
129                         ntohl(resp->status), rqstp->rq_vers);
130 
131         nlm_release_host(host);
132         nlm_release_file(file);
133         return rc;
134 }
135 
136 static __be32
137 nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
138                                          struct nlm_res  *resp)
139 {
140         struct nlm_host *host;
141         struct nlm_file *file;
142         __be32 rc = rpc_success;
143 
144         dprintk("lockd: LOCK          called\n");
145 
146         resp->cookie = argp->cookie;
147 
148         /* Obtain client and file */
149         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
150                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
151 
152 #if 0
153         /* If supplied state doesn't match current state, we assume it's
154          * an old request that time-warped somehow. Any error return would
155          * do in this case because it's irrelevant anyway.
156          *
157          * NB: We don't retrieve the remote host's state yet.
158          */
159         if (host->h_nsmstate && host->h_nsmstate != argp->state) {
160                 resp->status = nlm_lck_denied_nolocks;
161         } else
162 #endif
163 
164         /* Now try to lock the file */
165         resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
166                                                argp->block, &argp->cookie,
167                                                argp->reclaim));
168         if (resp->status == nlm_drop_reply)
169                 rc = rpc_drop_reply;
170         else
171                 dprintk("lockd: LOCK         status %d\n", ntohl(resp->status));
172 
173         nlm_release_host(host);
174         nlm_release_file(file);
175         return rc;
176 }
177 
178 static __be32
179 nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
180                                            struct nlm_res  *resp)
181 {
182         struct nlm_host *host;
183         struct nlm_file *file;
184 
185         dprintk("lockd: CANCEL        called\n");
186 
187         resp->cookie = argp->cookie;
188 
189         /* Don't accept requests during grace period */
190         if (locks_in_grace()) {
191                 resp->status = nlm_lck_denied_grace_period;
192                 return rpc_success;
193         }
194 
195         /* Obtain client and file */
196         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
197                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
198 
199         /* Try to cancel request. */
200         resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
201 
202         dprintk("lockd: CANCEL        status %d\n", ntohl(resp->status));
203         nlm_release_host(host);
204         nlm_release_file(file);
205         return rpc_success;
206 }
207 
208 /*
209  * UNLOCK: release a lock
210  */
211 static __be32
212 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
213                                            struct nlm_res  *resp)
214 {
215         struct nlm_host *host;
216         struct nlm_file *file;
217 
218         dprintk("lockd: UNLOCK        called\n");
219 
220         resp->cookie = argp->cookie;
221 
222         /* Don't accept new lock requests during grace period */
223         if (locks_in_grace()) {
224                 resp->status = nlm_lck_denied_grace_period;
225                 return rpc_success;
226         }
227 
228         /* Obtain client and file */
229         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
230                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
231 
232         /* Now try to remove the lock */
233         resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
234 
235         dprintk("lockd: UNLOCK        status %d\n", ntohl(resp->status));
236         nlm_release_host(host);
237         nlm_release_file(file);
238         return rpc_success;
239 }
240 
241 /*
242  * GRANTED: A server calls us to tell that a process' lock request
243  * was granted
244  */
245 static __be32
246 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
247                                             struct nlm_res  *resp)
248 {
249         resp->cookie = argp->cookie;
250 
251         dprintk("lockd: GRANTED       called\n");
252         resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
253         dprintk("lockd: GRANTED       status %d\n", ntohl(resp->status));
254         return rpc_success;
255 }
256 
257 /*
258  * This is the generic lockd callback for async RPC calls
259  */
260 static void nlmsvc_callback_exit(struct rpc_task *task, void *data)
261 {
262         dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
263                         -task->tk_status);
264 }
265 
266 static void nlmsvc_callback_release(void *data)
267 {
268         lock_kernel();
269         nlm_release_call(data);
270         unlock_kernel();
271 }
272 
273 static const struct rpc_call_ops nlmsvc_callback_ops = {
274         .rpc_call_done = nlmsvc_callback_exit,
275         .rpc_release = nlmsvc_callback_release,
276 };
277 
278 /*
279  * `Async' versions of the above service routines. They aren't really,
280  * because we send the callback before the reply proper. I hope this
281  * doesn't break any clients.
282  */
283 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
284                 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res  *))
285 {
286         struct nlm_host *host;
287         struct nlm_rqst *call;
288         __be32 stat;
289 
290         host = nlmsvc_lookup_host(rqstp,
291                                   argp->lock.caller,
292                                   argp->lock.len);
293         if (host == NULL)
294                 return rpc_system_err;
295 
296         call = nlm_alloc_call(host);
297         if (call == NULL)
298                 return rpc_system_err;
299 
300         stat = func(rqstp, argp, &call->a_res);
301         if (stat != 0) {
302                 nlm_release_call(call);
303                 return stat;
304         }
305 
306         call->a_flags = RPC_TASK_ASYNC;
307         if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
308                 return rpc_system_err;
309         return rpc_success;
310 }
311 
312 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
313                                              void            *resp)
314 {
315         dprintk("lockd: TEST_MSG      called\n");
316         return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
317 }
318 
319 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
320                                              void            *resp)
321 {
322         dprintk("lockd: LOCK_MSG      called\n");
323         return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
324 }
325 
326 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
327                                                void            *resp)
328 {
329         dprintk("lockd: CANCEL_MSG    called\n");
330         return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
331 }
332 
333 static __be32
334 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
335                                                void            *resp)
336 {
337         dprintk("lockd: UNLOCK_MSG    called\n");
338         return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
339 }
340 
341 static __be32
342 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
343                                                 void            *resp)
344 {
345         dprintk("lockd: GRANTED_MSG   called\n");
346         return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
347 }
348 
349 /*
350  * SHARE: create a DOS share or alter existing share.
351  */
352 static __be32
353 nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
354                                           struct nlm_res  *resp)
355 {
356         struct nlm_host *host;
357         struct nlm_file *file;
358 
359         dprintk("lockd: SHARE         called\n");
360 
361         resp->cookie = argp->cookie;
362 
363         /* Don't accept new lock requests during grace period */
364         if (locks_in_grace() && !argp->reclaim) {
365                 resp->status = nlm_lck_denied_grace_period;
366                 return rpc_success;
367         }
368 
369         /* Obtain client and file */
370         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
371                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
372 
373         /* Now try to create the share */
374         resp->status = cast_status(nlmsvc_share_file(host, file, argp));
375 
376         dprintk("lockd: SHARE         status %d\n", ntohl(resp->status));
377         nlm_release_host(host);
378         nlm_release_file(file);
379         return rpc_success;
380 }
381 
382 /*
383  * UNSHARE: Release a DOS share.
384  */
385 static __be32
386 nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
387                                             struct nlm_res  *resp)
388 {
389         struct nlm_host *host;
390         struct nlm_file *file;
391 
392         dprintk("lockd: UNSHARE       called\n");
393 
394         resp->cookie = argp->cookie;
395 
396         /* Don't accept requests during grace period */
397         if (locks_in_grace()) {
398                 resp->status = nlm_lck_denied_grace_period;
399                 return rpc_success;
400         }
401 
402         /* Obtain client and file */
403         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
404                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
405 
406         /* Now try to unshare the file */
407         resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
408 
409         dprintk("lockd: UNSHARE       status %d\n", ntohl(resp->status));
410         nlm_release_host(host);
411         nlm_release_file(file);
412         return rpc_success;
413 }
414 
415 /*
416  * NM_LOCK: Create an unmonitored lock
417  */
418 static __be32
419 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
420                                             struct nlm_res  *resp)
421 {
422         dprintk("lockd: NM_LOCK       called\n");
423 
424         argp->monitor = 0;              /* just clean the monitor flag */
425         return nlmsvc_proc_lock(rqstp, argp, resp);
426 }
427 
428 /*
429  * FREE_ALL: Release all locks and shares held by client
430  */
431 static __be32
432 nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
433                                              void            *resp)
434 {
435         struct nlm_host *host;
436 
437         /* Obtain client */
438         if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
439                 return rpc_success;
440 
441         nlmsvc_free_host_resources(host);
442         nlm_release_host(host);
443         return rpc_success;
444 }
445 
446 /*
447  * SM_NOTIFY: private callback from statd (not part of official NLM proto)
448  */
449 static __be32
450 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
451                                               void              *resp)
452 {
453         dprintk("lockd: SM_NOTIFY     called\n");
454 
455         if (!nlm_privileged_requester(rqstp)) {
456                 char buf[RPC_MAX_ADDRBUFLEN];
457                 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
458                                 svc_print_addr(rqstp, buf, sizeof(buf)));
459                 return rpc_system_err;
460         }
461 
462         nlm_host_rebooted(argp);
463         return rpc_success;
464 }
465 
466 /*
467  * client sent a GRANTED_RES, let's remove the associated block
468  */
469 static __be32
470 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
471                                                 void            *resp)
472 {
473         if (!nlmsvc_ops)
474                 return rpc_success;
475 
476         dprintk("lockd: GRANTED_RES   called\n");
477 
478         nlmsvc_grant_reply(&argp->cookie, argp->status);
479         return rpc_success;
480 }
481 
482 /*
483  * NLM Server procedures.
484  */
485 
486 #define nlmsvc_encode_norep     nlmsvc_encode_void
487 #define nlmsvc_decode_norep     nlmsvc_decode_void
488 #define nlmsvc_decode_testres   nlmsvc_decode_void
489 #define nlmsvc_decode_lockres   nlmsvc_decode_void
490 #define nlmsvc_decode_unlockres nlmsvc_decode_void
491 #define nlmsvc_decode_cancelres nlmsvc_decode_void
492 #define nlmsvc_decode_grantedres        nlmsvc_decode_void
493 
494 #define nlmsvc_proc_none        nlmsvc_proc_null
495 #define nlmsvc_proc_test_res    nlmsvc_proc_null
496 #define nlmsvc_proc_lock_res    nlmsvc_proc_null
497 #define nlmsvc_proc_cancel_res  nlmsvc_proc_null
498 #define nlmsvc_proc_unlock_res  nlmsvc_proc_null
499 
500 struct nlm_void                 { int dummy; };
501 
502 #define PROC(name, xargt, xrest, argt, rest, respsize)  \
503  { .pc_func     = (svc_procfunc) nlmsvc_proc_##name,    \
504    .pc_decode   = (kxdrproc_t) nlmsvc_decode_##xargt,   \
505    .pc_encode   = (kxdrproc_t) nlmsvc_encode_##xrest,   \
506    .pc_release  = NULL,                                 \
507    .pc_argsize  = sizeof(struct nlm_##argt),            \
508    .pc_ressize  = sizeof(struct nlm_##rest),            \
509    .pc_xdrressize = respsize,                           \
510  }
511 
512 #define Ck      (1+XDR_QUADLEN(NLM_MAXCOOKIELEN))       /* cookie */
513 #define St      1                               /* status */
514 #define No      (1+1024/4)                      /* Net Obj */
515 #define Rg      2                               /* range - offset + size */
516 
517 struct svc_procedure            nlmsvc_procedures[] = {
518   PROC(null,            void,           void,           void,   void, 1),
519   PROC(test,            testargs,       testres,        args,   res, Ck+St+2+No+Rg),
520   PROC(lock,            lockargs,       res,            args,   res, Ck+St),
521   PROC(cancel,          cancargs,       res,            args,   res, Ck+St),
522   PROC(unlock,          unlockargs,     res,            args,   res, Ck+St),
523   PROC(granted,         testargs,       res,            args,   res, Ck+St),
524   PROC(test_msg,        testargs,       norep,          args,   void, 1),
525   PROC(lock_msg,        lockargs,       norep,          args,   void, 1),
526   PROC(cancel_msg,      cancargs,       norep,          args,   void, 1),
527   PROC(unlock_msg,      unlockargs,     norep,          args,   void, 1),
528   PROC(granted_msg,     testargs,       norep,          args,   void, 1),
529   PROC(test_res,        testres,        norep,          res,    void, 1),
530   PROC(lock_res,        lockres,        norep,          res,    void, 1),
531   PROC(cancel_res,      cancelres,      norep,          res,    void, 1),
532   PROC(unlock_res,      unlockres,      norep,          res,    void, 1),
533   PROC(granted_res,     res,            norep,          res,    void, 1),
534   /* statd callback */
535   PROC(sm_notify,       reboot,         void,           reboot, void, 1),
536   PROC(none,            void,           void,           void,   void, 1),
537   PROC(none,            void,           void,           void,   void, 1),
538   PROC(none,            void,           void,           void,   void, 1),
539   PROC(share,           shareargs,      shareres,       args,   res, Ck+St+1),
540   PROC(unshare,         shareargs,      shareres,       args,   res, Ck+St+1),
541   PROC(nm_lock,         lockargs,       res,            args,   res, Ck+St),
542   PROC(free_all,        notify,         void,           args,   void, 0),
543 
544 };
545 

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