~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/lockd/svcproc.c

Version: ~ [ linux-5.4.2 ] ~ [ linux-5.3.15 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.88 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.158 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.206 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.206 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 #include <linux/sunrpc/svc_xprt.h>
 15 
 16 #define NLMDBG_FACILITY         NLMDBG_CLIENT
 17 
 18 #ifdef CONFIG_LOCKD_V4
 19 static __be32
 20 cast_to_nlm(__be32 status, u32 vers)
 21 {
 22         /* Note: status is assumed to be in network byte order !!! */
 23         if (vers != 4){
 24                 switch (status) {
 25                 case nlm_granted:
 26                 case nlm_lck_denied:
 27                 case nlm_lck_denied_nolocks:
 28                 case nlm_lck_blocked:
 29                 case nlm_lck_denied_grace_period:
 30                 case nlm_drop_reply:
 31                         break;
 32                 case nlm4_deadlock:
 33                         status = nlm_lck_denied;
 34                         break;
 35                 default:
 36                         status = nlm_lck_denied_nolocks;
 37                 }
 38         }
 39 
 40         return (status);
 41 }
 42 #define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
 43 #else
 44 #define cast_status(status) (status)
 45 #endif
 46 
 47 /*
 48  * Obtain client and file from arguments
 49  */
 50 static __be32
 51 nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
 52                         struct nlm_host **hostp, struct nlm_file **filp)
 53 {
 54         struct nlm_host         *host = NULL;
 55         struct nlm_file         *file = NULL;
 56         struct nlm_lock         *lock = &argp->lock;
 57         __be32                  error = 0;
 58 
 59         /* nfsd callbacks must have been installed for this procedure */
 60         if (!nlmsvc_ops)
 61                 return nlm_lck_denied_nolocks;
 62 
 63         /* Obtain host handle */
 64         if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
 65          || (argp->monitor && nsm_monitor(host) < 0))
 66                 goto no_locks;
 67         *hostp = host;
 68 
 69         /* Obtain file pointer. Not used by FREE_ALL call. */
 70         if (filp != NULL) {
 71                 error = cast_status(nlm_lookup_file(rqstp, &file, &lock->fh));
 72                 if (error != 0)
 73                         goto no_locks;
 74                 *filp = file;
 75 
 76                 /* Set up the missing parts of the file_lock structure */
 77                 lock->fl.fl_file  = file->f_file;
 78                 lock->fl.fl_owner = (fl_owner_t) host;
 79                 lock->fl.fl_lmops = &nlmsvc_lock_operations;
 80         }
 81 
 82         return 0;
 83 
 84 no_locks:
 85         nlmsvc_release_host(host);
 86         if (error)
 87                 return error;
 88         return nlm_lck_denied_nolocks;
 89 }
 90 
 91 /*
 92  * NULL: Test for presence of service
 93  */
 94 static __be32
 95 nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 96 {
 97         dprintk("lockd: NULL          called\n");
 98         return rpc_success;
 99 }
100 
101 /*
102  * TEST: Check for conflicting lock
103  */
104 static __be32
105 nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
106                                          struct nlm_res  *resp)
107 {
108         struct nlm_host *host;
109         struct nlm_file *file;
110         __be32 rc = rpc_success;
111 
112         dprintk("lockd: TEST          called\n");
113         resp->cookie = argp->cookie;
114 
115         /* Obtain client and file */
116         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
117                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
118 
119         /* Now check for conflicting locks */
120         resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
121         if (resp->status == nlm_drop_reply)
122                 rc = rpc_drop_reply;
123         else
124                 dprintk("lockd: TEST          status %d vers %d\n",
125                         ntohl(resp->status), rqstp->rq_vers);
126 
127         nlmsvc_release_host(host);
128         nlm_release_file(file);
129         return rc;
130 }
131 
132 static __be32
133 nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
134                                          struct nlm_res  *resp)
135 {
136         struct nlm_host *host;
137         struct nlm_file *file;
138         __be32 rc = rpc_success;
139 
140         dprintk("lockd: LOCK          called\n");
141 
142         resp->cookie = argp->cookie;
143 
144         /* Obtain client and file */
145         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
146                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
147 
148 #if 0
149         /* If supplied state doesn't match current state, we assume it's
150          * an old request that time-warped somehow. Any error return would
151          * do in this case because it's irrelevant anyway.
152          *
153          * NB: We don't retrieve the remote host's state yet.
154          */
155         if (host->h_nsmstate && host->h_nsmstate != argp->state) {
156                 resp->status = nlm_lck_denied_nolocks;
157         } else
158 #endif
159 
160         /* Now try to lock the file */
161         resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
162                                                argp->block, &argp->cookie,
163                                                argp->reclaim));
164         if (resp->status == nlm_drop_reply)
165                 rc = rpc_drop_reply;
166         else
167                 dprintk("lockd: LOCK         status %d\n", ntohl(resp->status));
168 
169         nlmsvc_release_host(host);
170         nlm_release_file(file);
171         return rc;
172 }
173 
174 static __be32
175 nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
176                                            struct nlm_res  *resp)
177 {
178         struct nlm_host *host;
179         struct nlm_file *file;
180         struct net *net = SVC_NET(rqstp);
181 
182         dprintk("lockd: CANCEL        called\n");
183 
184         resp->cookie = argp->cookie;
185 
186         /* Don't accept requests during grace period */
187         if (locks_in_grace(net)) {
188                 resp->status = nlm_lck_denied_grace_period;
189                 return rpc_success;
190         }
191 
192         /* Obtain client and file */
193         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
194                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
195 
196         /* Try to cancel request. */
197         resp->status = cast_status(nlmsvc_cancel_blocked(net, file, &argp->lock));
198 
199         dprintk("lockd: CANCEL        status %d\n", ntohl(resp->status));
200         nlmsvc_release_host(host);
201         nlm_release_file(file);
202         return rpc_success;
203 }
204 
205 /*
206  * UNLOCK: release a lock
207  */
208 static __be32
209 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
210                                            struct nlm_res  *resp)
211 {
212         struct nlm_host *host;
213         struct nlm_file *file;
214         struct net *net = SVC_NET(rqstp);
215 
216         dprintk("lockd: UNLOCK        called\n");
217 
218         resp->cookie = argp->cookie;
219 
220         /* Don't accept new lock requests during grace period */
221         if (locks_in_grace(net)) {
222                 resp->status = nlm_lck_denied_grace_period;
223                 return rpc_success;
224         }
225 
226         /* Obtain client and file */
227         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
228                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
229 
230         /* Now try to remove the lock */
231         resp->status = cast_status(nlmsvc_unlock(net, file, &argp->lock));
232 
233         dprintk("lockd: UNLOCK        status %d\n", ntohl(resp->status));
234         nlmsvc_release_host(host);
235         nlm_release_file(file);
236         return rpc_success;
237 }
238 
239 /*
240  * GRANTED: A server calls us to tell that a process' lock request
241  * was granted
242  */
243 static __be32
244 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
245                                             struct nlm_res  *resp)
246 {
247         resp->cookie = argp->cookie;
248 
249         dprintk("lockd: GRANTED       called\n");
250         resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
251         dprintk("lockd: GRANTED       status %d\n", ntohl(resp->status));
252         return rpc_success;
253 }
254 
255 /*
256  * This is the generic lockd callback for async RPC calls
257  */
258 static void nlmsvc_callback_exit(struct rpc_task *task, void *data)
259 {
260         dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
261                         -task->tk_status);
262 }
263 
264 void nlmsvc_release_call(struct nlm_rqst *call)
265 {
266         if (!atomic_dec_and_test(&call->a_count))
267                 return;
268         nlmsvc_release_host(call->a_host);
269         kfree(call);
270 }
271 
272 static void nlmsvc_callback_release(void *data)
273 {
274         nlmsvc_release_call(data);
275 }
276 
277 static const struct rpc_call_ops nlmsvc_callback_ops = {
278         .rpc_call_done = nlmsvc_callback_exit,
279         .rpc_release = nlmsvc_callback_release,
280 };
281 
282 /*
283  * `Async' versions of the above service routines. They aren't really,
284  * because we send the callback before the reply proper. I hope this
285  * doesn't break any clients.
286  */
287 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
288                 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res  *))
289 {
290         struct nlm_host *host;
291         struct nlm_rqst *call;
292         __be32 stat;
293 
294         host = nlmsvc_lookup_host(rqstp,
295                                   argp->lock.caller,
296                                   argp->lock.len);
297         if (host == NULL)
298                 return rpc_system_err;
299 
300         call = nlm_alloc_call(host);
301         nlmsvc_release_host(host);
302         if (call == NULL)
303                 return rpc_system_err;
304 
305         stat = func(rqstp, argp, &call->a_res);
306         if (stat != 0) {
307                 nlmsvc_release_call(call);
308                 return stat;
309         }
310 
311         call->a_flags = RPC_TASK_ASYNC;
312         if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
313                 return rpc_system_err;
314         return rpc_success;
315 }
316 
317 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
318                                              void            *resp)
319 {
320         dprintk("lockd: TEST_MSG      called\n");
321         return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
322 }
323 
324 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
325                                              void            *resp)
326 {
327         dprintk("lockd: LOCK_MSG      called\n");
328         return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
329 }
330 
331 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
332                                                void            *resp)
333 {
334         dprintk("lockd: CANCEL_MSG    called\n");
335         return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
336 }
337 
338 static __be32
339 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
340                                                void            *resp)
341 {
342         dprintk("lockd: UNLOCK_MSG    called\n");
343         return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
344 }
345 
346 static __be32
347 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
348                                                 void            *resp)
349 {
350         dprintk("lockd: GRANTED_MSG   called\n");
351         return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
352 }
353 
354 /*
355  * SHARE: create a DOS share or alter existing share.
356  */
357 static __be32
358 nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
359                                           struct nlm_res  *resp)
360 {
361         struct nlm_host *host;
362         struct nlm_file *file;
363 
364         dprintk("lockd: SHARE         called\n");
365 
366         resp->cookie = argp->cookie;
367 
368         /* Don't accept new lock requests during grace period */
369         if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
370                 resp->status = nlm_lck_denied_grace_period;
371                 return rpc_success;
372         }
373 
374         /* Obtain client and file */
375         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
376                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
377 
378         /* Now try to create the share */
379         resp->status = cast_status(nlmsvc_share_file(host, file, argp));
380 
381         dprintk("lockd: SHARE         status %d\n", ntohl(resp->status));
382         nlmsvc_release_host(host);
383         nlm_release_file(file);
384         return rpc_success;
385 }
386 
387 /*
388  * UNSHARE: Release a DOS share.
389  */
390 static __be32
391 nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
392                                             struct nlm_res  *resp)
393 {
394         struct nlm_host *host;
395         struct nlm_file *file;
396 
397         dprintk("lockd: UNSHARE       called\n");
398 
399         resp->cookie = argp->cookie;
400 
401         /* Don't accept requests during grace period */
402         if (locks_in_grace(SVC_NET(rqstp))) {
403                 resp->status = nlm_lck_denied_grace_period;
404                 return rpc_success;
405         }
406 
407         /* Obtain client and file */
408         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
409                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
410 
411         /* Now try to unshare the file */
412         resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
413 
414         dprintk("lockd: UNSHARE       status %d\n", ntohl(resp->status));
415         nlmsvc_release_host(host);
416         nlm_release_file(file);
417         return rpc_success;
418 }
419 
420 /*
421  * NM_LOCK: Create an unmonitored lock
422  */
423 static __be32
424 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
425                                             struct nlm_res  *resp)
426 {
427         dprintk("lockd: NM_LOCK       called\n");
428 
429         argp->monitor = 0;              /* just clean the monitor flag */
430         return nlmsvc_proc_lock(rqstp, argp, resp);
431 }
432 
433 /*
434  * FREE_ALL: Release all locks and shares held by client
435  */
436 static __be32
437 nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
438                                              void            *resp)
439 {
440         struct nlm_host *host;
441 
442         /* Obtain client */
443         if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
444                 return rpc_success;
445 
446         nlmsvc_free_host_resources(host);
447         nlmsvc_release_host(host);
448         return rpc_success;
449 }
450 
451 /*
452  * SM_NOTIFY: private callback from statd (not part of official NLM proto)
453  */
454 static __be32
455 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
456                                               void              *resp)
457 {
458         dprintk("lockd: SM_NOTIFY     called\n");
459 
460         if (!nlm_privileged_requester(rqstp)) {
461                 char buf[RPC_MAX_ADDRBUFLEN];
462                 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
463                                 svc_print_addr(rqstp, buf, sizeof(buf)));
464                 return rpc_system_err;
465         }
466 
467         nlm_host_rebooted(SVC_NET(rqstp), argp);
468         return rpc_success;
469 }
470 
471 /*
472  * client sent a GRANTED_RES, let's remove the associated block
473  */
474 static __be32
475 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
476                                                 void            *resp)
477 {
478         if (!nlmsvc_ops)
479                 return rpc_success;
480 
481         dprintk("lockd: GRANTED_RES   called\n");
482 
483         nlmsvc_grant_reply(&argp->cookie, argp->status);
484         return rpc_success;
485 }
486 
487 /*
488  * NLM Server procedures.
489  */
490 
491 #define nlmsvc_encode_norep     nlmsvc_encode_void
492 #define nlmsvc_decode_norep     nlmsvc_decode_void
493 #define nlmsvc_decode_testres   nlmsvc_decode_void
494 #define nlmsvc_decode_lockres   nlmsvc_decode_void
495 #define nlmsvc_decode_unlockres nlmsvc_decode_void
496 #define nlmsvc_decode_cancelres nlmsvc_decode_void
497 #define nlmsvc_decode_grantedres        nlmsvc_decode_void
498 
499 #define nlmsvc_proc_none        nlmsvc_proc_null
500 #define nlmsvc_proc_test_res    nlmsvc_proc_null
501 #define nlmsvc_proc_lock_res    nlmsvc_proc_null
502 #define nlmsvc_proc_cancel_res  nlmsvc_proc_null
503 #define nlmsvc_proc_unlock_res  nlmsvc_proc_null
504 
505 struct nlm_void                 { int dummy; };
506 
507 #define PROC(name, xargt, xrest, argt, rest, respsize)  \
508  { .pc_func     = (svc_procfunc) nlmsvc_proc_##name,    \
509    .pc_decode   = (kxdrproc_t) nlmsvc_decode_##xargt,   \
510    .pc_encode   = (kxdrproc_t) nlmsvc_encode_##xrest,   \
511    .pc_release  = NULL,                                 \
512    .pc_argsize  = sizeof(struct nlm_##argt),            \
513    .pc_ressize  = sizeof(struct nlm_##rest),            \
514    .pc_xdrressize = respsize,                           \
515  }
516 
517 #define Ck      (1+XDR_QUADLEN(NLM_MAXCOOKIELEN))       /* cookie */
518 #define St      1                               /* status */
519 #define No      (1+1024/4)                      /* Net Obj */
520 #define Rg      2                               /* range - offset + size */
521 
522 struct svc_procedure            nlmsvc_procedures[] = {
523   PROC(null,            void,           void,           void,   void, 1),
524   PROC(test,            testargs,       testres,        args,   res, Ck+St+2+No+Rg),
525   PROC(lock,            lockargs,       res,            args,   res, Ck+St),
526   PROC(cancel,          cancargs,       res,            args,   res, Ck+St),
527   PROC(unlock,          unlockargs,     res,            args,   res, Ck+St),
528   PROC(granted,         testargs,       res,            args,   res, Ck+St),
529   PROC(test_msg,        testargs,       norep,          args,   void, 1),
530   PROC(lock_msg,        lockargs,       norep,          args,   void, 1),
531   PROC(cancel_msg,      cancargs,       norep,          args,   void, 1),
532   PROC(unlock_msg,      unlockargs,     norep,          args,   void, 1),
533   PROC(granted_msg,     testargs,       norep,          args,   void, 1),
534   PROC(test_res,        testres,        norep,          res,    void, 1),
535   PROC(lock_res,        lockres,        norep,          res,    void, 1),
536   PROC(cancel_res,      cancelres,      norep,          res,    void, 1),
537   PROC(unlock_res,      unlockres,      norep,          res,    void, 1),
538   PROC(granted_res,     res,            norep,          res,    void, 1),
539   /* statd callback */
540   PROC(sm_notify,       reboot,         void,           reboot, void, 1),
541   PROC(none,            void,           void,           void,   void, 1),
542   PROC(none,            void,           void,           void,   void, 1),
543   PROC(none,            void,           void,           void,   void, 1),
544   PROC(share,           shareargs,      shareres,       args,   res, Ck+St+1),
545   PROC(unshare,         shareargs,      shareres,       args,   res, Ck+St+1),
546   PROC(nm_lock,         lockargs,       res,            args,   res, Ck+St),
547   PROC(free_all,        notify,         void,           args,   void, 0),
548 
549 };
550 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp