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) 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_res *resp) 106 { 107 struct nlm_args *argp = rqstp->rq_argp; 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_test(struct svc_rqst *rqstp) 134 { 135 return __nlmsvc_proc_test(rqstp, rqstp->rq_resp); 136 } 137 138 static __be32 139 __nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_res *resp) 140 { 141 struct nlm_args *argp = rqstp->rq_argp; 142 struct nlm_host *host; 143 struct nlm_file *file; 144 __be32 rc = rpc_success; 145 146 dprintk("lockd: LOCK called\n"); 147 148 resp->cookie = argp->cookie; 149 150 /* Obtain client and file */ 151 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 152 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 153 154 #if 0 155 /* If supplied state doesn't match current state, we assume it's 156 * an old request that time-warped somehow. Any error return would 157 * do in this case because it's irrelevant anyway. 158 * 159 * NB: We don't retrieve the remote host's state yet. 160 */ 161 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 162 resp->status = nlm_lck_denied_nolocks; 163 } else 164 #endif 165 166 /* Now try to lock the file */ 167 resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock, 168 argp->block, &argp->cookie, 169 argp->reclaim)); 170 if (resp->status == nlm_drop_reply) 171 rc = rpc_drop_reply; 172 else 173 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 174 175 nlmsvc_release_host(host); 176 nlm_release_file(file); 177 return rc; 178 } 179 180 static __be32 181 nlmsvc_proc_lock(struct svc_rqst *rqstp) 182 { 183 return __nlmsvc_proc_lock(rqstp, rqstp->rq_resp); 184 } 185 186 static __be32 187 __nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_res *resp) 188 { 189 struct nlm_args *argp = rqstp->rq_argp; 190 struct nlm_host *host; 191 struct nlm_file *file; 192 struct net *net = SVC_NET(rqstp); 193 194 dprintk("lockd: CANCEL called\n"); 195 196 resp->cookie = argp->cookie; 197 198 /* Don't accept requests during grace period */ 199 if (locks_in_grace(net)) { 200 resp->status = nlm_lck_denied_grace_period; 201 return rpc_success; 202 } 203 204 /* Obtain client and file */ 205 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 206 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 207 208 /* Try to cancel request. */ 209 resp->status = cast_status(nlmsvc_cancel_blocked(net, file, &argp->lock)); 210 211 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 212 nlmsvc_release_host(host); 213 nlm_release_file(file); 214 return rpc_success; 215 } 216 217 static __be32 218 nlmsvc_proc_cancel(struct svc_rqst *rqstp) 219 { 220 return __nlmsvc_proc_cancel(rqstp, rqstp->rq_resp); 221 } 222 223 /* 224 * UNLOCK: release a lock 225 */ 226 static __be32 227 __nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_res *resp) 228 { 229 struct nlm_args *argp = rqstp->rq_argp; 230 struct nlm_host *host; 231 struct nlm_file *file; 232 struct net *net = SVC_NET(rqstp); 233 234 dprintk("lockd: UNLOCK called\n"); 235 236 resp->cookie = argp->cookie; 237 238 /* Don't accept new lock requests during grace period */ 239 if (locks_in_grace(net)) { 240 resp->status = nlm_lck_denied_grace_period; 241 return rpc_success; 242 } 243 244 /* Obtain client and file */ 245 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 246 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 247 248 /* Now try to remove the lock */ 249 resp->status = cast_status(nlmsvc_unlock(net, file, &argp->lock)); 250 251 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 252 nlmsvc_release_host(host); 253 nlm_release_file(file); 254 return rpc_success; 255 } 256 257 static __be32 258 nlmsvc_proc_unlock(struct svc_rqst *rqstp) 259 { 260 return __nlmsvc_proc_unlock(rqstp, rqstp->rq_resp); 261 } 262 263 /* 264 * GRANTED: A server calls us to tell that a process' lock request 265 * was granted 266 */ 267 static __be32 268 __nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_res *resp) 269 { 270 struct nlm_args *argp = rqstp->rq_argp; 271 272 resp->cookie = argp->cookie; 273 274 dprintk("lockd: GRANTED called\n"); 275 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock); 276 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 277 return rpc_success; 278 } 279 280 static __be32 281 nlmsvc_proc_granted(struct svc_rqst *rqstp) 282 { 283 return __nlmsvc_proc_granted(rqstp, rqstp->rq_resp); 284 } 285 286 /* 287 * This is the generic lockd callback for async RPC calls 288 */ 289 static void nlmsvc_callback_exit(struct rpc_task *task, void *data) 290 { 291 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 292 -task->tk_status); 293 } 294 295 void nlmsvc_release_call(struct nlm_rqst *call) 296 { 297 if (!atomic_dec_and_test(&call->a_count)) 298 return; 299 nlmsvc_release_host(call->a_host); 300 kfree(call); 301 } 302 303 static void nlmsvc_callback_release(void *data) 304 { 305 nlmsvc_release_call(data); 306 } 307 308 static const struct rpc_call_ops nlmsvc_callback_ops = { 309 .rpc_call_done = nlmsvc_callback_exit, 310 .rpc_release = nlmsvc_callback_release, 311 }; 312 313 /* 314 * `Async' versions of the above service routines. They aren't really, 315 * because we send the callback before the reply proper. I hope this 316 * doesn't break any clients. 317 */ 318 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, 319 __be32 (*func)(struct svc_rqst *, struct nlm_res *)) 320 { 321 struct nlm_args *argp = rqstp->rq_argp; 322 struct nlm_host *host; 323 struct nlm_rqst *call; 324 __be32 stat; 325 326 host = nlmsvc_lookup_host(rqstp, 327 argp->lock.caller, 328 argp->lock.len); 329 if (host == NULL) 330 return rpc_system_err; 331 332 call = nlm_alloc_call(host); 333 nlmsvc_release_host(host); 334 if (call == NULL) 335 return rpc_system_err; 336 337 stat = func(rqstp, &call->a_res); 338 if (stat != 0) { 339 nlmsvc_release_call(call); 340 return stat; 341 } 342 343 call->a_flags = RPC_TASK_ASYNC; 344 if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0) 345 return rpc_system_err; 346 return rpc_success; 347 } 348 349 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp) 350 { 351 dprintk("lockd: TEST_MSG called\n"); 352 return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, __nlmsvc_proc_test); 353 } 354 355 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp) 356 { 357 dprintk("lockd: LOCK_MSG called\n"); 358 return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, __nlmsvc_proc_lock); 359 } 360 361 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp) 362 { 363 dprintk("lockd: CANCEL_MSG called\n"); 364 return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, __nlmsvc_proc_cancel); 365 } 366 367 static __be32 368 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp) 369 { 370 dprintk("lockd: UNLOCK_MSG called\n"); 371 return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlmsvc_proc_unlock); 372 } 373 374 static __be32 375 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp) 376 { 377 dprintk("lockd: GRANTED_MSG called\n"); 378 return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, __nlmsvc_proc_granted); 379 } 380 381 /* 382 * SHARE: create a DOS share or alter existing share. 383 */ 384 static __be32 385 nlmsvc_proc_share(struct svc_rqst *rqstp) 386 { 387 struct nlm_args *argp = rqstp->rq_argp; 388 struct nlm_res *resp = rqstp->rq_resp; 389 struct nlm_host *host; 390 struct nlm_file *file; 391 392 dprintk("lockd: SHARE called\n"); 393 394 resp->cookie = argp->cookie; 395 396 /* Don't accept new lock requests during grace period */ 397 if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) { 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 create the share */ 407 resp->status = cast_status(nlmsvc_share_file(host, file, argp)); 408 409 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 410 nlmsvc_release_host(host); 411 nlm_release_file(file); 412 return rpc_success; 413 } 414 415 /* 416 * UNSHARE: Release a DOS share. 417 */ 418 static __be32 419 nlmsvc_proc_unshare(struct svc_rqst *rqstp) 420 { 421 struct nlm_args *argp = rqstp->rq_argp; 422 struct nlm_res *resp = rqstp->rq_resp; 423 struct nlm_host *host; 424 struct nlm_file *file; 425 426 dprintk("lockd: UNSHARE called\n"); 427 428 resp->cookie = argp->cookie; 429 430 /* Don't accept requests during grace period */ 431 if (locks_in_grace(SVC_NET(rqstp))) { 432 resp->status = nlm_lck_denied_grace_period; 433 return rpc_success; 434 } 435 436 /* Obtain client and file */ 437 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 438 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 439 440 /* Now try to unshare the file */ 441 resp->status = cast_status(nlmsvc_unshare_file(host, file, argp)); 442 443 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 444 nlmsvc_release_host(host); 445 nlm_release_file(file); 446 return rpc_success; 447 } 448 449 /* 450 * NM_LOCK: Create an unmonitored lock 451 */ 452 static __be32 453 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp) 454 { 455 struct nlm_args *argp = rqstp->rq_argp; 456 457 dprintk("lockd: NM_LOCK called\n"); 458 459 argp->monitor = 0; /* just clean the monitor flag */ 460 return nlmsvc_proc_lock(rqstp); 461 } 462 463 /* 464 * FREE_ALL: Release all locks and shares held by client 465 */ 466 static __be32 467 nlmsvc_proc_free_all(struct svc_rqst *rqstp) 468 { 469 struct nlm_args *argp = rqstp->rq_argp; 470 struct nlm_host *host; 471 472 /* Obtain client */ 473 if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL)) 474 return rpc_success; 475 476 nlmsvc_free_host_resources(host); 477 nlmsvc_release_host(host); 478 return rpc_success; 479 } 480 481 /* 482 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 483 */ 484 static __be32 485 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp) 486 { 487 struct nlm_reboot *argp = rqstp->rq_argp; 488 489 dprintk("lockd: SM_NOTIFY called\n"); 490 491 if (!nlm_privileged_requester(rqstp)) { 492 char buf[RPC_MAX_ADDRBUFLEN]; 493 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 494 svc_print_addr(rqstp, buf, sizeof(buf))); 495 return rpc_system_err; 496 } 497 498 nlm_host_rebooted(SVC_NET(rqstp), argp); 499 return rpc_success; 500 } 501 502 /* 503 * client sent a GRANTED_RES, let's remove the associated block 504 */ 505 static __be32 506 nlmsvc_proc_granted_res(struct svc_rqst *rqstp) 507 { 508 struct nlm_res *argp = rqstp->rq_argp; 509 510 if (!nlmsvc_ops) 511 return rpc_success; 512 513 dprintk("lockd: GRANTED_RES called\n"); 514 515 nlmsvc_grant_reply(&argp->cookie, argp->status); 516 return rpc_success; 517 } 518 519 /* 520 * NLM Server procedures. 521 */ 522 523 #define nlmsvc_encode_norep nlmsvc_encode_void 524 #define nlmsvc_decode_norep nlmsvc_decode_void 525 #define nlmsvc_decode_testres nlmsvc_decode_void 526 #define nlmsvc_decode_lockres nlmsvc_decode_void 527 #define nlmsvc_decode_unlockres nlmsvc_decode_void 528 #define nlmsvc_decode_cancelres nlmsvc_decode_void 529 #define nlmsvc_decode_grantedres nlmsvc_decode_void 530 531 #define nlmsvc_proc_none nlmsvc_proc_null 532 #define nlmsvc_proc_test_res nlmsvc_proc_null 533 #define nlmsvc_proc_lock_res nlmsvc_proc_null 534 #define nlmsvc_proc_cancel_res nlmsvc_proc_null 535 #define nlmsvc_proc_unlock_res nlmsvc_proc_null 536 537 struct nlm_void { int dummy; }; 538 539 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 540 { .pc_func = nlmsvc_proc_##name, \ 541 .pc_decode = nlmsvc_decode_##xargt, \ 542 .pc_encode = nlmsvc_encode_##xrest, \ 543 .pc_release = NULL, \ 544 .pc_argsize = sizeof(struct nlm_##argt), \ 545 .pc_ressize = sizeof(struct nlm_##rest), \ 546 .pc_xdrressize = respsize, \ 547 } 548 549 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 550 #define St 1 /* status */ 551 #define No (1+1024/4) /* Net Obj */ 552 #define Rg 2 /* range - offset + size */ 553 554 const struct svc_procedure nlmsvc_procedures[] = { 555 PROC(null, void, void, void, void, 1), 556 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 557 PROC(lock, lockargs, res, args, res, Ck+St), 558 PROC(cancel, cancargs, res, args, res, Ck+St), 559 PROC(unlock, unlockargs, res, args, res, Ck+St), 560 PROC(granted, testargs, res, args, res, Ck+St), 561 PROC(test_msg, testargs, norep, args, void, 1), 562 PROC(lock_msg, lockargs, norep, args, void, 1), 563 PROC(cancel_msg, cancargs, norep, args, void, 1), 564 PROC(unlock_msg, unlockargs, norep, args, void, 1), 565 PROC(granted_msg, testargs, norep, args, void, 1), 566 PROC(test_res, testres, norep, res, void, 1), 567 PROC(lock_res, lockres, norep, res, void, 1), 568 PROC(cancel_res, cancelres, norep, res, void, 1), 569 PROC(unlock_res, unlockres, norep, res, void, 1), 570 PROC(granted_res, res, norep, res, void, 1), 571 /* statd callback */ 572 PROC(sm_notify, reboot, void, reboot, void, 1), 573 PROC(none, void, void, void, void, 1), 574 PROC(none, void, void, void, void, 1), 575 PROC(none, void, void, void, void, 1), 576 PROC(share, shareargs, shareres, args, res, Ck+St+1), 577 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 578 PROC(nm_lock, lockargs, res, args, res, Ck+St), 579 PROC(free_all, notify, void, args, void, 0), 580 581 }; 582