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/smp_lock.h> 13 #include <linux/lockd/lockd.h> 14 #include <linux/lockd/share.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 nlm_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 nlm_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 nlm_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; 179 180 dprintk("lockd: CANCEL called\n"); 181 182 resp->cookie = argp->cookie; 183 184 /* Don't accept requests during grace period */ 185 if (locks_in_grace()) { 186 resp->status = nlm_lck_denied_grace_period; 187 return rpc_success; 188 } 189 190 /* Obtain client and file */ 191 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 192 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 193 194 /* Try to cancel request. */ 195 resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock)); 196 197 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 198 nlm_release_host(host); 199 nlm_release_file(file); 200 return rpc_success; 201 } 202 203 /* 204 * UNLOCK: release a lock 205 */ 206 static __be32 207 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 208 struct nlm_res *resp) 209 { 210 struct nlm_host *host; 211 struct nlm_file *file; 212 213 dprintk("lockd: UNLOCK called\n"); 214 215 resp->cookie = argp->cookie; 216 217 /* Don't accept new lock requests during grace period */ 218 if (locks_in_grace()) { 219 resp->status = nlm_lck_denied_grace_period; 220 return rpc_success; 221 } 222 223 /* Obtain client and file */ 224 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 225 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 226 227 /* Now try to remove the lock */ 228 resp->status = cast_status(nlmsvc_unlock(file, &argp->lock)); 229 230 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 231 nlm_release_host(host); 232 nlm_release_file(file); 233 return rpc_success; 234 } 235 236 /* 237 * GRANTED: A server calls us to tell that a process' lock request 238 * was granted 239 */ 240 static __be32 241 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 242 struct nlm_res *resp) 243 { 244 resp->cookie = argp->cookie; 245 246 dprintk("lockd: GRANTED called\n"); 247 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock); 248 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 249 return rpc_success; 250 } 251 252 /* 253 * This is the generic lockd callback for async RPC calls 254 */ 255 static void nlmsvc_callback_exit(struct rpc_task *task, void *data) 256 { 257 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 258 -task->tk_status); 259 } 260 261 static void nlmsvc_callback_release(void *data) 262 { 263 lock_kernel(); 264 nlm_release_call(data); 265 unlock_kernel(); 266 } 267 268 static const struct rpc_call_ops nlmsvc_callback_ops = { 269 .rpc_call_done = nlmsvc_callback_exit, 270 .rpc_release = nlmsvc_callback_release, 271 }; 272 273 /* 274 * `Async' versions of the above service routines. They aren't really, 275 * because we send the callback before the reply proper. I hope this 276 * doesn't break any clients. 277 */ 278 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 279 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 280 { 281 struct nlm_host *host; 282 struct nlm_rqst *call; 283 __be32 stat; 284 285 host = nlmsvc_lookup_host(rqstp, 286 argp->lock.caller, 287 argp->lock.len); 288 if (host == NULL) 289 return rpc_system_err; 290 291 call = nlm_alloc_call(host); 292 if (call == NULL) 293 return rpc_system_err; 294 295 stat = func(rqstp, argp, &call->a_res); 296 if (stat != 0) { 297 nlm_release_call(call); 298 return stat; 299 } 300 301 call->a_flags = RPC_TASK_ASYNC; 302 if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0) 303 return rpc_system_err; 304 return rpc_success; 305 } 306 307 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 308 void *resp) 309 { 310 dprintk("lockd: TEST_MSG called\n"); 311 return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test); 312 } 313 314 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 315 void *resp) 316 { 317 dprintk("lockd: LOCK_MSG called\n"); 318 return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock); 319 } 320 321 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 322 void *resp) 323 { 324 dprintk("lockd: CANCEL_MSG called\n"); 325 return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel); 326 } 327 328 static __be32 329 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 330 void *resp) 331 { 332 dprintk("lockd: UNLOCK_MSG called\n"); 333 return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock); 334 } 335 336 static __be32 337 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 338 void *resp) 339 { 340 dprintk("lockd: GRANTED_MSG called\n"); 341 return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted); 342 } 343 344 /* 345 * SHARE: create a DOS share or alter existing share. 346 */ 347 static __be32 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 (locks_in_grace() && !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 resp->status == nlm_drop_reply ? rpc_drop_reply :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 __be32 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 (locks_in_grace()) { 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 resp->status == nlm_drop_reply ? rpc_drop_reply :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 __be32 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 __be32 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 __be32 445 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 446 void *resp) 447 { 448 dprintk("lockd: SM_NOTIFY called\n"); 449 450 if (!nlm_privileged_requester(rqstp)) { 451 char buf[RPC_MAX_ADDRBUFLEN]; 452 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 453 svc_print_addr(rqstp, buf, sizeof(buf))); 454 return rpc_system_err; 455 } 456 457 nlm_host_rebooted(argp); 458 return rpc_success; 459 } 460 461 /* 462 * client sent a GRANTED_RES, let's remove the associated block 463 */ 464 static __be32 465 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 466 void *resp) 467 { 468 if (!nlmsvc_ops) 469 return rpc_success; 470 471 dprintk("lockd: GRANTED_RES called\n"); 472 473 nlmsvc_grant_reply(&argp->cookie, argp->status); 474 return rpc_success; 475 } 476 477 /* 478 * NLM Server procedures. 479 */ 480 481 #define nlmsvc_encode_norep nlmsvc_encode_void 482 #define nlmsvc_decode_norep nlmsvc_decode_void 483 #define nlmsvc_decode_testres nlmsvc_decode_void 484 #define nlmsvc_decode_lockres nlmsvc_decode_void 485 #define nlmsvc_decode_unlockres nlmsvc_decode_void 486 #define nlmsvc_decode_cancelres nlmsvc_decode_void 487 #define nlmsvc_decode_grantedres nlmsvc_decode_void 488 489 #define nlmsvc_proc_none nlmsvc_proc_null 490 #define nlmsvc_proc_test_res nlmsvc_proc_null 491 #define nlmsvc_proc_lock_res nlmsvc_proc_null 492 #define nlmsvc_proc_cancel_res nlmsvc_proc_null 493 #define nlmsvc_proc_unlock_res nlmsvc_proc_null 494 495 struct nlm_void { int dummy; }; 496 497 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 498 { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \ 499 .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \ 500 .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \ 501 .pc_release = NULL, \ 502 .pc_argsize = sizeof(struct nlm_##argt), \ 503 .pc_ressize = sizeof(struct nlm_##rest), \ 504 .pc_xdrressize = respsize, \ 505 } 506 507 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 508 #define St 1 /* status */ 509 #define No (1+1024/4) /* Net Obj */ 510 #define Rg 2 /* range - offset + size */ 511 512 struct svc_procedure nlmsvc_procedures[] = { 513 PROC(null, void, void, void, void, 1), 514 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 515 PROC(lock, lockargs, res, args, res, Ck+St), 516 PROC(cancel, cancargs, res, args, res, Ck+St), 517 PROC(unlock, unlockargs, res, args, res, Ck+St), 518 PROC(granted, testargs, res, args, res, Ck+St), 519 PROC(test_msg, testargs, norep, args, void, 1), 520 PROC(lock_msg, lockargs, norep, args, void, 1), 521 PROC(cancel_msg, cancargs, norep, args, void, 1), 522 PROC(unlock_msg, unlockargs, norep, args, void, 1), 523 PROC(granted_msg, testargs, norep, args, void, 1), 524 PROC(test_res, testres, norep, res, void, 1), 525 PROC(lock_res, lockres, norep, res, void, 1), 526 PROC(cancel_res, cancelres, norep, res, void, 1), 527 PROC(unlock_res, unlockres, norep, res, void, 1), 528 PROC(granted_res, res, norep, res, void, 1), 529 /* statd callback */ 530 PROC(sm_notify, reboot, void, reboot, void, 1), 531 PROC(none, void, void, void, void, 1), 532 PROC(none, void, void, void, void, 1), 533 PROC(none, void, void, void, void, 1), 534 PROC(share, shareargs, shareres, args, res, Ck+St+1), 535 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 536 PROC(nm_lock, lockargs, res, args, res, Ck+St), 537 PROC(free_all, notify, void, args, void, 0), 538 539 }; 540