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