fs/lockd/svcproc.c

   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/config.h>
  11 #include <linux/types.h>
  12 #include <linux/time.h>
  13 #include <linux/slab.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 #include <linux/lockd/sm_inter.h>
  21
  22
  23 #define NLMDBG_FACILITY         NLMDBG_CLIENT
  24
  25 static u32      nlmsvc_callback(struct svc_rqst *, u32, struct nlm_res *);
  26
  27 static const struct rpc_call_ops nlmsvc_callback_ops;
  28
  29 #ifdef CONFIG_LOCKD_V4
  30 static u32
  31 cast_to_nlm(u32 status, u32 vers)
  32 {
  33         /* Note: status is assumed to be in network byte order !!! */
  34         if (vers != 4){
  35                 switch (status) {
  36                 case nlm_granted:
  37                 case nlm_lck_denied:
  38                 case nlm_lck_denied_nolocks:
  39                 case nlm_lck_blocked:
  40                 case nlm_lck_denied_grace_period:
  41                         break;
  42                 case nlm4_deadlock:
  43                         status = nlm_lck_denied;
  44                         break;
  45                 default:
  46                         status = nlm_lck_denied_nolocks;
  47                 }
  48         }
  49
  50         return (status);
  51 }
  52 #define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
  53 #else
  54 #define cast_status(status) (status)
  55 #endif
  56
  57 /*
  58  * Obtain client and file from arguments
  59  */
  60 static u32
  61 nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
  62                         struct nlm_host **hostp, struct nlm_file **filp)
  63 {
  64         struct nlm_host         *host = NULL;
  65         struct nlm_file         *file = NULL;
  66         struct nlm_lock         *lock = &argp->lock;
  67         u32                     error;
  68
  69         /* nfsd callbacks must have been installed for this procedure */
  70         if (!nlmsvc_ops)
  71                 return nlm_lck_denied_nolocks;
  72
  73         /* Obtain host handle */
  74         if (!(host = nlmsvc_lookup_host(rqstp))
  75          || (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0))
  76                 goto no_locks;
  77         *hostp = host;
  78
  79         /* Obtain file pointer. Not used by FREE_ALL call. */
  80         if (filp != NULL) {
  81                 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
  82                         goto no_locks;
  83                 *filp = file;
  84
  85                 /* Set up the missing parts of the file_lock structure */
  86                 lock->fl.fl_file  = file->f_file;
  87                 lock->fl.fl_owner = (fl_owner_t) host;
  88                 lock->fl.fl_lmops = &nlmsvc_lock_operations;
  89         }
  90
  91         return 0;
  92
  93 no_locks:
  94         if (host)
  95                 nlm_release_host(host);
  96         return nlm_lck_denied_nolocks;
  97 }
  98
  99 /*
 100  * NULL: Test for presence of service
 101  */
 102 static int
 103 nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 104 {
 105         dprintk("lockd: NULL          called\n");
 106         return rpc_success;
 107 }
 108
 109 /*
 110  * TEST: Check for conflicting lock
 111  */
 112 static int
 113 nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
 114                                          struct nlm_res  *resp)
 115 {
 116         struct nlm_host *host;
 117         struct nlm_file *file;
 118
 119         dprintk("lockd: TEST          called\n");
 120         resp->cookie = argp->cookie;
 121
 122         /* Don't accept test requests during grace period */
 123         if (nlmsvc_grace_period) {
 124                 resp->status = nlm_lck_denied_grace_period;
 125                 return rpc_success;
 126         }
 127
 128         /* Obtain client and file */
 129         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
 130                 return rpc_success;
 131
 132         /* Now check for conflicting locks */
 133         resp->status = cast_status(nlmsvc_testlock(file, &argp->lock, &resp->lock));
 134
 135         dprintk("lockd: TEST          status %d vers %d\n",
 136                 ntohl(resp->status), rqstp->rq_vers);
 137         nlm_release_host(host);
 138         nlm_release_file(file);
 139         return rpc_success;
 140 }
 141
 142 static int
 143 nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 144                                          struct nlm_res  *resp)
 145 {
 146         struct nlm_host *host;
 147         struct nlm_file *file;
 148
 149         dprintk("lockd: LOCK          called\n");
 150
 151         resp->cookie = argp->cookie;
 152
 153         /* Don't accept new lock requests during grace period */
 154         if (nlmsvc_grace_period && !argp->reclaim) {
 155                 resp->status = nlm_lck_denied_grace_period;
 156                 return rpc_success;
 157         }
 158
 159         /* Obtain client and file */
 160         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
 161                 return rpc_success;
 162
 163 #if 0
 164         /* If supplied state doesn't match current state, we assume it's
 165          * an old request that time-warped somehow. Any error return would
 166          * do in this case because it's irrelevant anyway.
 167          *
 168          * NB: We don't retrieve the remote host's state yet.
 169          */
 170         if (host->h_nsmstate && host->h_nsmstate != argp->state) {
 171                 resp->status = nlm_lck_denied_nolocks;
 172         } else
 173 #endif
 174
 175         /* Now try to lock the file */
 176         resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock,
 177                                                argp->block, &argp->cookie));
 178
 179         dprintk("lockd: LOCK          status %d\n", ntohl(resp->status));
 180         nlm_release_host(host);
 181         nlm_release_file(file);
 182         return rpc_success;
 183 }
 184
 185 static int
 186 nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
 187                                            struct nlm_res  *resp)
 188 {
 189         struct nlm_host *host;
 190         struct nlm_file *file;
 191
 192         dprintk("lockd: CANCEL        called\n");
 193
 194         resp->cookie = argp->cookie;
 195
 196         /* Don't accept requests during grace period */
 197         if (nlmsvc_grace_period) {
 198                 resp->status = nlm_lck_denied_grace_period;
 199                 return rpc_success;
 200         }
 201
 202         /* Obtain client and file */
 203         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
 204                 return rpc_success;
 205
 206         /* Try to cancel request. */
 207         resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
 208
 209         dprintk("lockd: CANCEL        status %d\n", ntohl(resp->status));
 210         nlm_release_host(host);
 211         nlm_release_file(file);
 212         return rpc_success;
 213 }
 214
 215 /*
 216  * UNLOCK: release a lock
 217  */
 218 static int
 219 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
 220                                            struct nlm_res  *resp)
 221 {
 222         struct nlm_host *host;
 223         struct nlm_file *file;
 224
 225         dprintk("lockd: UNLOCK        called\n");
 226
 227         resp->cookie = argp->cookie;
 228
 229         /* Don't accept new lock requests during grace period */
 230         if (nlmsvc_grace_period) {
 231                 resp->status = nlm_lck_denied_grace_period;
 232                 return rpc_success;
 233         }
 234
 235         /* Obtain client and file */
 236         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
 237                 return rpc_success;
 238
 239         /* Now try to remove the lock */
 240         resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
 241
 242         dprintk("lockd: UNLOCK        status %d\n", ntohl(resp->status));
 243         nlm_release_host(host);
 244         nlm_release_file(file);
 245         return rpc_success;
 246 }
 247
 248 /*
 249  * GRANTED: A server calls us to tell that a process' lock request
 250  * was granted
 251  */
 252 static int
 253 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
 254                                             struct nlm_res  *resp)
 255 {
 256         resp->cookie = argp->cookie;
 257
 258         dprintk("lockd: GRANTED       called\n");
 259         resp->status = nlmclnt_grant(&argp->lock);
 260         dprintk("lockd: GRANTED       status %d\n", ntohl(resp->status));
 261         return rpc_success;
 262 }
 263
 264 /*
 265  * `Async' versions of the above service routines. They aren't really,
 266  * because we send the callback before the reply proper. I hope this
 267  * doesn't break any clients.
 268  */
 269 static int
 270 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 271                                              void            *resp)
 272 {
 273         struct nlm_res  res;
 274         u32             stat;
 275
 276         dprintk("lockd: TEST_MSG      called\n");
 277         memset(&res, 0, sizeof(res));
 278
 279         if ((stat = nlmsvc_proc_test(rqstp, argp, &res)) == 0)
 280                 stat = nlmsvc_callback(rqstp, NLMPROC_TEST_RES, &res);
 281         return stat;
 282 }
 283
 284 static int
 285 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 286                                              void            *resp)
 287 {
 288         struct nlm_res  res;
 289         u32             stat;
 290
 291         dprintk("lockd: LOCK_MSG      called\n");
 292         memset(&res, 0, sizeof(res));
 293
 294         if ((stat = nlmsvc_proc_lock(rqstp, argp, &res)) == 0)
 295                 stat = nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, &res);
 296         return stat;
 297 }
 298
 299 static int
 300 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 301                                                void            *resp)
 302 {
 303         struct nlm_res  res;
 304         u32             stat;
 305
 306         dprintk("lockd: CANCEL_MSG    called\n");
 307         memset(&res, 0, sizeof(res));
 308
 309         if ((stat = nlmsvc_proc_cancel(rqstp, argp, &res)) == 0)
 310                 stat = nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, &res);
 311         return stat;
 312 }
 313
 314 static int
 315 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 316                                                void            *resp)
 317 {
 318         struct nlm_res  res;
 319         u32             stat;
 320
 321         dprintk("lockd: UNLOCK_MSG    called\n");
 322         memset(&res, 0, sizeof(res));
 323
 324         if ((stat = nlmsvc_proc_unlock(rqstp, argp, &res)) == 0)
 325                 stat = nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, &res);
 326         return stat;
 327 }
 328
 329 static int
 330 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 331                                                 void            *resp)
 332 {
 333         struct nlm_res  res;
 334         u32             stat;
 335
 336         dprintk("lockd: GRANTED_MSG   called\n");
 337         memset(&res, 0, sizeof(res));
 338
 339         if ((stat = nlmsvc_proc_granted(rqstp, argp, &res)) == 0)
 340                 stat = nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, &res);
 341         return stat;
 342 }
 343
 344 /*
 345  * SHARE: create a DOS share or alter existing share.
 346  */
 347 static int
 348 nlmsvc_proc_share(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: SHARE         called\n");
 355
 356         resp->cookie = argp->cookie;
 357
 358         /* Don't accept new lock requests during grace period */
 359         if (nlmsvc_grace_period && !argp->reclaim) {
 360                 resp->status = nlm_lck_denied_grace_period;
 361                 return rpc_success;
 362         }
 363
 364         /* Obtain client and file */
 365         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
 366                 return rpc_success;
 367
 368         /* Now try to create the share */
 369         resp->status = cast_status(nlmsvc_share_file(host, file, argp));
 370
 371         dprintk("lockd: SHARE         status %d\n", ntohl(resp->status));
 372         nlm_release_host(host);
 373         nlm_release_file(file);
 374         return rpc_success;
 375 }
 376
 377 /*
 378  * UNSHARE: Release a DOS share.
 379  */
 380 static int
 381 nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
 382                                             struct nlm_res  *resp)
 383 {
 384         struct nlm_host *host;
 385         struct nlm_file *file;
 386
 387         dprintk("lockd: UNSHARE       called\n");
 388
 389         resp->cookie = argp->cookie;
 390
 391         /* Don't accept requests during grace period */
 392         if (nlmsvc_grace_period) {
 393                 resp->status = nlm_lck_denied_grace_period;
 394                 return rpc_success;
 395         }
 396
 397         /* Obtain client and file */
 398         if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
 399                 return rpc_success;
 400
 401         /* Now try to unshare the file */
 402         resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
 403
 404         dprintk("lockd: UNSHARE       status %d\n", ntohl(resp->status));
 405         nlm_release_host(host);
 406         nlm_release_file(file);
 407         return rpc_success;
 408 }
 409
 410 /*
 411  * NM_LOCK: Create an unmonitored lock
 412  */
 413 static int
 414 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 415                                             struct nlm_res  *resp)
 416 {
 417         dprintk("lockd: NM_LOCK       called\n");
 418
 419         argp->monitor = 0;              /* just clean the monitor flag */
 420         return nlmsvc_proc_lock(rqstp, argp, resp);
 421 }
 422
 423 /*
 424  * FREE_ALL: Release all locks and shares held by client
 425  */
 426 static int
 427 nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
 428                                              void            *resp)
 429 {
 430         struct nlm_host *host;
 431
 432         /* Obtain client */
 433         if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
 434                 return rpc_success;
 435
 436         nlmsvc_free_host_resources(host);
 437         nlm_release_host(host);
 438         return rpc_success;
 439 }
 440
 441 /*
 442  * SM_NOTIFY: private callback from statd (not part of official NLM proto)
 443  */
 444 static int
 445 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
 446                                               void              *resp)
 447 {
 448         struct sockaddr_in      saddr = rqstp->rq_addr;
 449         int                     vers = argp->vers;
 450         int                     prot = argp->proto >> 1;
 451         struct nlm_host         *host;
 452
 453         dprintk("lockd: SM_NOTIFY     called\n");
 454         if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
 455          || ntohs(saddr.sin_port) >= 1024) {
 456                 printk(KERN_WARNING
 457                         "lockd: rejected NSM callback from %08x:%d\n",
 458                         ntohl(rqstp->rq_addr.sin_addr.s_addr),
 459                         ntohs(rqstp->rq_addr.sin_port));
 460                 return rpc_system_err;
 461         }
 462
 463         /* Obtain the host pointer for this NFS server and try to
 464          * reclaim all locks we hold on this server.
 465          */
 466         saddr.sin_addr.s_addr = argp->addr;
 467         if ((argp->proto & 1)==0) {
 468                 if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) {
 469                         nlmclnt_recovery(host, argp->state);
 470                         nlm_release_host(host);
 471                 }
 472         } else {
 473                 /* If we run on an NFS server, delete all locks held by the client */
 474                 if ((host = nlm_lookup_host(1, &saddr, prot, vers)) != NULL) {
 475                         nlmsvc_free_host_resources(host);
 476                         nlm_release_host(host);
 477                 }
 478         }
 479
 480         return rpc_success;
 481 }
 482
 483 /*
 484  * client sent a GRANTED_RES, let's remove the associated block
 485  */
 486 static int
 487 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
 488                                                 void            *resp)
 489 {
 490         if (!nlmsvc_ops)
 491                 return rpc_success;
 492
 493         dprintk("lockd: GRANTED_RES   called\n");
 494
 495         nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status);
 496         return rpc_success;
 497 }
 498
 499 /*
 500  * This is the generic lockd callback for async RPC calls
 501  */
 502 static u32
 503 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_res *resp)
 504 {
 505         struct nlm_host *host;
 506         struct nlm_rqst *call;
 507
 508         if (!(call = nlmclnt_alloc_call()))
 509                 return rpc_system_err;
 510
 511         host = nlmclnt_lookup_host(&rqstp->rq_addr,
 512                                 rqstp->rq_prot, rqstp->rq_vers);
 513         if (!host) {
 514                 kfree(call);
 515                 return rpc_system_err;
 516         }
 517
 518         call->a_flags = RPC_TASK_ASYNC;
 519         call->a_host  = host;
 520         memcpy(&call->a_args, resp, sizeof(*resp));
 521
 522         if (nlmsvc_async_call(call, proc, &nlmsvc_callback_ops) < 0)
 523                 goto error;
 524
 525         return rpc_success;
 526  error:
 527         nlm_release_host(host);
 528         kfree(call);
 529         return rpc_system_err;
 530 }
 531
 532 static void nlmsvc_callback_exit(struct rpc_task *task, void *data)
 533 {
 534         struct nlm_rqst *call = data;
 535
 536         if (task->tk_status < 0) {
 537                 dprintk("lockd: %4d callback failed (errno = %d)\n",
 538                                         task->tk_pid, -task->tk_status);
 539         }
 540         nlm_release_host(call->a_host);
 541         kfree(call);
 542 }
 543
 544 static const struct rpc_call_ops nlmsvc_callback_ops = {
 545         .rpc_call_done = nlmsvc_callback_exit,
 546 };
 547
 548 /*
 549  * NLM Server procedures.
 550  */
 551
 552 #define nlmsvc_encode_norep     nlmsvc_encode_void
 553 #define nlmsvc_decode_norep     nlmsvc_decode_void
 554 #define nlmsvc_decode_testres   nlmsvc_decode_void
 555 #define nlmsvc_decode_lockres   nlmsvc_decode_void
 556 #define nlmsvc_decode_unlockres nlmsvc_decode_void
 557 #define nlmsvc_decode_cancelres nlmsvc_decode_void
 558 #define nlmsvc_decode_grantedres        nlmsvc_decode_void
 559
 560 #define nlmsvc_proc_none        nlmsvc_proc_null
 561 #define nlmsvc_proc_test_res    nlmsvc_proc_null
 562 #define nlmsvc_proc_lock_res    nlmsvc_proc_null
 563 #define nlmsvc_proc_cancel_res  nlmsvc_proc_null
 564 #define nlmsvc_proc_unlock_res  nlmsvc_proc_null
 565
 566 struct nlm_void                 { int dummy; };
 567
 568 #define PROC(name, xargt, xrest, argt, rest, respsize)  \
 569  { .pc_func     = (svc_procfunc) nlmsvc_proc_##name,    \
 570    .pc_decode   = (kxdrproc_t) nlmsvc_decode_##xargt,   \
 571    .pc_encode   = (kxdrproc_t) nlmsvc_encode_##xrest,   \
 572    .pc_release  = NULL,                                 \
 573    .pc_argsize  = sizeof(struct nlm_##argt),            \
 574    .pc_ressize  = sizeof(struct nlm_##rest),            \
 575    .pc_xdrressize = respsize,                           \
 576  }
 577
 578 #define Ck      (1+XDR_QUADLEN(NLM_MAXCOOKIELEN))       /* cookie */
 579 #define St      1                               /* status */
 580 #define No      (1+1024/4)                      /* Net Obj */
 581 #define Rg      2                               /* range - offset + size */
 582
 583 struct svc_procedure            nlmsvc_procedures[] = {
 584   PROC(null,            void,           void,           void,   void, 1),
 585   PROC(test,            testargs,       testres,        args,   res, Ck+St+2+No+Rg),
 586   PROC(lock,            lockargs,       res,            args,   res, Ck+St),
 587   PROC(cancel,          cancargs,       res,            args,   res, Ck+St),
 588   PROC(unlock,          unlockargs,     res,            args,   res, Ck+St),
 589   PROC(granted,         testargs,       res,            args,   res, Ck+St),
 590   PROC(test_msg,        testargs,       norep,          args,   void, 1),
 591   PROC(lock_msg,        lockargs,       norep,          args,   void, 1),
 592   PROC(cancel_msg,      cancargs,       norep,          args,   void, 1),
 593   PROC(unlock_msg,      unlockargs,     norep,          args,   void, 1),
 594   PROC(granted_msg,     testargs,       norep,          args,   void, 1),
 595   PROC(test_res,        testres,        norep,          res,    void, 1),
 596   PROC(lock_res,        lockres,        norep,          res,    void, 1),
 597   PROC(cancel_res,      cancelres,      norep,          res,    void, 1),
 598   PROC(unlock_res,      unlockres,      norep,          res,    void, 1),
 599   PROC(granted_res,     res,            norep,          res,    void, 1),
 600   /* statd callback */
 601   PROC(sm_notify,       reboot,         void,           reboot, void, 1),
 602   PROC(none,            void,           void,           void,   void, 1),
 603   PROC(none,            void,           void,           void,   void, 1),
 604   PROC(none,            void,           void,           void,   void, 1),
 605   PROC(share,           shareargs,      shareres,       args,   res, Ck+St+1),
 606   PROC(unshare,         shareargs,      shareres,       args,   res, Ck+St+1),
 607   PROC(nm_lock,         lockargs,       res,            args,   res, Ck+St),
 608   PROC(free_all,        notify,         void,           args,   void, 0),
 609
 610 };