fs/lockd/svc4proc.c

   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/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>
  20
  21
  22 #define NLMDBG_FACILITY         NLMDBG_CLIENT
  23
  24 static u32      nlm4svc_callback(struct svc_rqst *, u32, struct nlm_res *);
  25
  26 static const struct rpc_call_ops nlm4svc_callback_ops;
  27
  28 /*
  29  * Obtain client and file from arguments
  30  */
  31 static u32
  32 nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
  33                         struct nlm_host **hostp, struct nlm_file **filp)
  34 {
  35         struct nlm_host         *host = NULL;
  36         struct nlm_file         *file = NULL;
  37         struct nlm_lock         *lock = &argp->lock;
  38         u32                     error = 0;
  39
  40         /* nfsd callbacks must have been installed for this procedure */
  41         if (!nlmsvc_ops)
  42                 return nlm_lck_denied_nolocks;
  43
  44         /* Obtain host handle */
  45         if (!(host = nlmsvc_lookup_host(rqstp))
  46          || (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0))
  47                 goto no_locks;
  48         *hostp = host;
  49
  50         /* Obtain file pointer. Not used by FREE_ALL call. */
  51         if (filp != NULL) {
  52                 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
  53                         goto no_locks;
  54                 *filp = file;
  55
  56                 /* Set up the missing parts of the file_lock structure */
  57                 lock->fl.fl_file  = file->f_file;
  58                 lock->fl.fl_owner = (fl_owner_t) host;
  59                 lock->fl.fl_lmops = &nlmsvc_lock_operations;
  60         }
  61
  62         return 0;
  63
  64 no_locks:
  65         if (host)
  66                 nlm_release_host(host);
  67         if (error)
  68                 return error;
  69         return nlm_lck_denied_nolocks;
  70 }
  71
  72 /*
  73  * NULL: Test for presence of service
  74  */
  75 static int
  76 nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
  77 {
  78         dprintk("lockd: NULL          called\n");
  79         return rpc_success;
  80 }
  81
  82 /*
  83  * TEST: Check for conflicting lock
  84  */
  85 static int
  86 nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
  87                                          struct nlm_res  *resp)
  88 {
  89         struct nlm_host *host;
  90         struct nlm_file *file;
  91
  92         dprintk("lockd: TEST4        called\n");
  93         resp->cookie = argp->cookie;
  94
  95         /* Don't accept test requests during grace period */
  96         if (nlmsvc_grace_period) {
  97                 resp->status = nlm_lck_denied_grace_period;
  98                 return rpc_success;
  99         }
 100
 101         /* Obtain client and file */
 102         if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 103                 return rpc_success;
 104
 105         /* Now check for conflicting locks */
 106         resp->status = nlmsvc_testlock(file, &argp->lock, &resp->lock);
 107
 108         dprintk("lockd: TEST4          status %d\n", ntohl(resp->status));
 109         nlm_release_host(host);
 110         nlm_release_file(file);
 111         return rpc_success;
 112 }
 113
 114 static int
 115 nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 116                                          struct nlm_res  *resp)
 117 {
 118         struct nlm_host *host;
 119         struct nlm_file *file;
 120
 121         dprintk("lockd: LOCK          called\n");
 122
 123         resp->cookie = argp->cookie;
 124
 125         /* Don't accept new lock requests during grace period */
 126         if (nlmsvc_grace_period && !argp->reclaim) {
 127                 resp->status = nlm_lck_denied_grace_period;
 128                 return rpc_success;
 129         }
 130
 131         /* Obtain client and file */
 132         if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 133                 return rpc_success;
 134
 135 #if 0
 136         /* If supplied state doesn't match current state, we assume it's
 137          * an old request that time-warped somehow. Any error return would
 138          * do in this case because it's irrelevant anyway.
 139          *
 140          * NB: We don't retrieve the remote host's state yet.
 141          */
 142         if (host->h_nsmstate && host->h_nsmstate != argp->state) {
 143                 resp->status = nlm_lck_denied_nolocks;
 144         } else
 145 #endif
 146
 147         /* Now try to lock the file */
 148         resp->status = nlmsvc_lock(rqstp, file, &argp->lock,
 149                                         argp->block, &argp->cookie);
 150
 151         dprintk("lockd: LOCK          status %d\n", ntohl(resp->status));
 152         nlm_release_host(host);
 153         nlm_release_file(file);
 154         return rpc_success;
 155 }
 156
 157 static int
 158 nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
 159                                            struct nlm_res  *resp)
 160 {
 161         struct nlm_host *host;
 162         struct nlm_file *file;
 163
 164         dprintk("lockd: CANCEL        called\n");
 165
 166         resp->cookie = argp->cookie;
 167
 168         /* Don't accept requests during grace period */
 169         if (nlmsvc_grace_period) {
 170                 resp->status = nlm_lck_denied_grace_period;
 171                 return rpc_success;
 172         }
 173
 174         /* Obtain client and file */
 175         if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 176                 return rpc_success;
 177
 178         /* Try to cancel request. */
 179         resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
 180
 181         dprintk("lockd: CANCEL        status %d\n", ntohl(resp->status));
 182         nlm_release_host(host);
 183         nlm_release_file(file);
 184         return rpc_success;
 185 }
 186
 187 /*
 188  * UNLOCK: release a lock
 189  */
 190 static int
 191 nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
 192                                            struct nlm_res  *resp)
 193 {
 194         struct nlm_host *host;
 195         struct nlm_file *file;
 196
 197         dprintk("lockd: UNLOCK        called\n");
 198
 199         resp->cookie = argp->cookie;
 200
 201         /* Don't accept new lock requests during grace period */
 202         if (nlmsvc_grace_period) {
 203                 resp->status = nlm_lck_denied_grace_period;
 204                 return rpc_success;
 205         }
 206
 207         /* Obtain client and file */
 208         if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 209                 return rpc_success;
 210
 211         /* Now try to remove the lock */
 212         resp->status = nlmsvc_unlock(file, &argp->lock);
 213
 214         dprintk("lockd: UNLOCK        status %d\n", ntohl(resp->status));
 215         nlm_release_host(host);
 216         nlm_release_file(file);
 217         return rpc_success;
 218 }
 219
 220 /*
 221  * GRANTED: A server calls us to tell that a process' lock request
 222  * was granted
 223  */
 224 static int
 225 nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
 226                                             struct nlm_res  *resp)
 227 {
 228         resp->cookie = argp->cookie;
 229
 230         dprintk("lockd: GRANTED       called\n");
 231         resp->status = nlmclnt_grant(&argp->lock);
 232         dprintk("lockd: GRANTED       status %d\n", ntohl(resp->status));
 233         return rpc_success;
 234 }
 235
 236 /*
 237  * `Async' versions of the above service routines. They aren't really,
 238  * because we send the callback before the reply proper. I hope this
 239  * doesn't break any clients.
 240  */
 241 static int
 242 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 243                                              void            *resp)
 244 {
 245         struct nlm_res  res;
 246         u32             stat;
 247
 248         dprintk("lockd: TEST_MSG      called\n");
 249         memset(&res, 0, sizeof(res));
 250
 251         if ((stat = nlm4svc_proc_test(rqstp, argp, &res)) == 0)
 252                 stat = nlm4svc_callback(rqstp, NLMPROC_TEST_RES, &res);
 253         return stat;
 254 }
 255
 256 static int
 257 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 258                                              void            *resp)
 259 {
 260         struct nlm_res  res;
 261         u32             stat;
 262
 263         dprintk("lockd: LOCK_MSG      called\n");
 264         memset(&res, 0, sizeof(res));
 265
 266         if ((stat = nlm4svc_proc_lock(rqstp, argp, &res)) == 0)
 267                 stat = nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, &res);
 268         return stat;
 269 }
 270
 271 static int
 272 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 273                                                void            *resp)
 274 {
 275         struct nlm_res  res;
 276         u32             stat;
 277
 278         dprintk("lockd: CANCEL_MSG    called\n");
 279         memset(&res, 0, sizeof(res));
 280
 281         if ((stat = nlm4svc_proc_cancel(rqstp, argp, &res)) == 0)
 282                 stat = nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, &res);
 283         return stat;
 284 }
 285
 286 static int
 287 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 288                                                void            *resp)
 289 {
 290         struct nlm_res  res;
 291         u32             stat;
 292
 293         dprintk("lockd: UNLOCK_MSG    called\n");
 294         memset(&res, 0, sizeof(res));
 295
 296         if ((stat = nlm4svc_proc_unlock(rqstp, argp, &res)) == 0)
 297                 stat = nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, &res);
 298         return stat;
 299 }
 300
 301 static int
 302 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 303                                                 void            *resp)
 304 {
 305         struct nlm_res  res;
 306         u32             stat;
 307
 308         dprintk("lockd: GRANTED_MSG   called\n");
 309         memset(&res, 0, sizeof(res));
 310
 311         if ((stat = nlm4svc_proc_granted(rqstp, argp, &res)) == 0)
 312                 stat = nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, &res);
 313         return stat;
 314 }
 315
 316 /*
 317  * SHARE: create a DOS share or alter existing share.
 318  */
 319 static int
 320 nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
 321                                           struct nlm_res  *resp)
 322 {
 323         struct nlm_host *host;
 324         struct nlm_file *file;
 325
 326         dprintk("lockd: SHARE         called\n");
 327
 328         resp->cookie = argp->cookie;
 329
 330         /* Don't accept new lock requests during grace period */
 331         if (nlmsvc_grace_period && !argp->reclaim) {
 332                 resp->status = nlm_lck_denied_grace_period;
 333                 return rpc_success;
 334         }
 335
 336         /* Obtain client and file */
 337         if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 338                 return rpc_success;
 339
 340         /* Now try to create the share */
 341         resp->status = nlmsvc_share_file(host, file, argp);
 342
 343         dprintk("lockd: SHARE         status %d\n", ntohl(resp->status));
 344         nlm_release_host(host);
 345         nlm_release_file(file);
 346         return rpc_success;
 347 }
 348
 349 /*
 350  * UNSHARE: Release a DOS share.
 351  */
 352 static int
 353 nlm4svc_proc_unshare(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: UNSHARE       called\n");
 360
 361         resp->cookie = argp->cookie;
 362
 363         /* Don't accept requests during grace period */
 364         if (nlmsvc_grace_period) {
 365                 resp->status = nlm_lck_denied_grace_period;
 366                 return rpc_success;
 367         }
 368
 369         /* Obtain client and file */
 370         if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 371                 return rpc_success;
 372
 373         /* Now try to lock the file */
 374         resp->status = nlmsvc_unshare_file(host, file, argp);
 375
 376         dprintk("lockd: UNSHARE       status %d\n", ntohl(resp->status));
 377         nlm_release_host(host);
 378         nlm_release_file(file);
 379         return rpc_success;
 380 }
 381
 382 /*
 383  * NM_LOCK: Create an unmonitored lock
 384  */
 385 static int
 386 nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 387                                             struct nlm_res  *resp)
 388 {
 389         dprintk("lockd: NM_LOCK       called\n");
 390
 391         argp->monitor = 0;              /* just clean the monitor flag */
 392         return nlm4svc_proc_lock(rqstp, argp, resp);
 393 }
 394
 395 /*
 396  * FREE_ALL: Release all locks and shares held by client
 397  */
 398 static int
 399 nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
 400                                              void            *resp)
 401 {
 402         struct nlm_host *host;
 403
 404         /* Obtain client */
 405         if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
 406                 return rpc_success;
 407
 408         nlmsvc_free_host_resources(host);
 409         nlm_release_host(host);
 410         return rpc_success;
 411 }
 412
 413 /*
 414  * SM_NOTIFY: private callback from statd (not part of official NLM proto)
 415  */
 416 static int
 417 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
 418                                               void              *resp)
 419 {
 420         struct sockaddr_in      saddr = rqstp->rq_addr;
 421         int                     vers = argp->vers;
 422         int                     prot = argp->proto >> 1;
 423
 424         struct nlm_host         *host;
 425
 426         dprintk("lockd: SM_NOTIFY     called\n");
 427         if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
 428          || ntohs(saddr.sin_port) >= 1024) {
 429                 printk(KERN_WARNING
 430                         "lockd: rejected NSM callback from %08x:%d\n",
 431                         ntohl(rqstp->rq_addr.sin_addr.s_addr),
 432                         ntohs(rqstp->rq_addr.sin_port));
 433                 return rpc_system_err;
 434         }
 435
 436         /* Obtain the host pointer for this NFS server and try to
 437          * reclaim all locks we hold on this server.
 438          */
 439         saddr.sin_addr.s_addr = argp->addr;
 440
 441         if ((argp->proto & 1)==0) {
 442                 if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) {
 443                         nlmclnt_recovery(host, argp->state);
 444                         nlm_release_host(host);
 445                 }
 446         } else {
 447                 /* If we run on an NFS server, delete all locks held by the client */
 448
 449                 if ((host = nlm_lookup_host(1, &saddr, prot, vers)) != NULL) {
 450                         nlmsvc_free_host_resources(host);
 451                         nlm_release_host(host);
 452                 }
 453         }
 454         return rpc_success;
 455 }
 456
 457 /*
 458  * client sent a GRANTED_RES, let's remove the associated block
 459  */
 460 static int
 461 nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
 462                                                 void            *resp)
 463 {
 464         if (!nlmsvc_ops)
 465                 return rpc_success;
 466
 467         dprintk("lockd: GRANTED_RES   called\n");
 468
 469         nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status);
 470         return rpc_success;
 471 }
 472
 473
 474 /*
 475  * This is the generic lockd callback for async RPC calls
 476  */
 477 static u32
 478 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_res *resp)
 479 {
 480         struct nlm_host *host;
 481         struct nlm_rqst *call;
 482
 483         if (!(call = nlmclnt_alloc_call()))
 484                 return rpc_system_err;
 485
 486         host = nlmclnt_lookup_host(&rqstp->rq_addr,
 487                                 rqstp->rq_prot, rqstp->rq_vers);
 488         if (!host) {
 489                 kfree(call);
 490                 return rpc_system_err;
 491         }
 492
 493         call->a_flags = RPC_TASK_ASYNC;
 494         call->a_host  = host;
 495         memcpy(&call->a_args, resp, sizeof(*resp));
 496
 497         if (nlmsvc_async_call(call, proc, &nlm4svc_callback_ops) < 0)
 498                 goto error;
 499
 500         return rpc_success;
 501  error:
 502         kfree(call);
 503         nlm_release_host(host);
 504         return rpc_system_err;
 505 }
 506
 507 static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
 508 {
 509         struct nlm_rqst *call = data;
 510
 511         if (task->tk_status < 0) {
 512                 dprintk("lockd: %4d callback failed (errno = %d)\n",
 513                                         task->tk_pid, -task->tk_status);
 514         }
 515         nlm_release_host(call->a_host);
 516         kfree(call);
 517 }
 518
 519 static const struct rpc_call_ops nlm4svc_callback_ops = {
 520         .rpc_call_done = nlm4svc_callback_exit,
 521 };
 522
 523 /*
 524  * NLM Server procedures.
 525  */
 526
 527 #define nlm4svc_encode_norep    nlm4svc_encode_void
 528 #define nlm4svc_decode_norep    nlm4svc_decode_void
 529 #define nlm4svc_decode_testres  nlm4svc_decode_void
 530 #define nlm4svc_decode_lockres  nlm4svc_decode_void
 531 #define nlm4svc_decode_unlockres        nlm4svc_decode_void
 532 #define nlm4svc_decode_cancelres        nlm4svc_decode_void
 533 #define nlm4svc_decode_grantedres       nlm4svc_decode_void
 534
 535 #define nlm4svc_proc_none       nlm4svc_proc_null
 536 #define nlm4svc_proc_test_res   nlm4svc_proc_null
 537 #define nlm4svc_proc_lock_res   nlm4svc_proc_null
 538 #define nlm4svc_proc_cancel_res nlm4svc_proc_null
 539 #define nlm4svc_proc_unlock_res nlm4svc_proc_null
 540
 541 struct nlm_void                 { int dummy; };
 542
 543 #define PROC(name, xargt, xrest, argt, rest, respsize)  \
 544  { .pc_func     = (svc_procfunc) nlm4svc_proc_##name,   \
 545    .pc_decode   = (kxdrproc_t) nlm4svc_decode_##xargt,  \
 546    .pc_encode   = (kxdrproc_t) nlm4svc_encode_##xrest,  \
 547    .pc_release  = NULL,                                 \
 548    .pc_argsize  = sizeof(struct nlm_##argt),            \
 549    .pc_ressize  = sizeof(struct nlm_##rest),            \
 550    .pc_xdrressize = respsize,                           \
 551  }
 552 #define Ck      (1+XDR_QUADLEN(NLM_MAXCOOKIELEN))       /* cookie */
 553 #define No      (1+1024/4)                              /* netobj */
 554 #define St      1                                       /* status */
 555 #define Rg      4                                       /* range (offset + length) */
 556 struct svc_procedure            nlmsvc_procedures4[] = {
 557   PROC(null,            void,           void,           void,   void, 1),
 558   PROC(test,            testargs,       testres,        args,   res, Ck+St+2+No+Rg),
 559   PROC(lock,            lockargs,       res,            args,   res, Ck+St),
 560   PROC(cancel,          cancargs,       res,            args,   res, Ck+St),
 561   PROC(unlock,          unlockargs,     res,            args,   res, Ck+St),
 562   PROC(granted,         testargs,       res,            args,   res, Ck+St),
 563   PROC(test_msg,        testargs,       norep,          args,   void, 1),
 564   PROC(lock_msg,        lockargs,       norep,          args,   void, 1),
 565   PROC(cancel_msg,      cancargs,       norep,          args,   void, 1),
 566   PROC(unlock_msg,      unlockargs,     norep,          args,   void, 1),
 567   PROC(granted_msg,     testargs,       norep,          args,   void, 1),
 568   PROC(test_res,        testres,        norep,          res,    void, 1),
 569   PROC(lock_res,        lockres,        norep,          res,    void, 1),
 570   PROC(cancel_res,      cancelres,      norep,          res,    void, 1),
 571   PROC(unlock_res,      unlockres,      norep,          res,    void, 1),
 572   PROC(granted_res,     res,            norep,          res,    void, 1),
 573   /* statd callback */
 574   PROC(sm_notify,       reboot,         void,           reboot, void, 1),
 575   PROC(none,            void,           void,           void,   void, 0),
 576   PROC(none,            void,           void,           void,   void, 0),
 577   PROC(none,            void,           void,           void,   void, 0),
 578   PROC(share,           shareargs,      shareres,       args,   res, Ck+St+1),
 579   PROC(unshare,         shareargs,      shareres,       args,   res, Ck+St+1),
 580   PROC(nm_lock,         lockargs,       res,            args,   res, Ck+St),
 581   PROC(free_all,        notify,         void,           args,   void, 1),
 582
 583 };