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 nlm_release_call(data); 264 } 265 266 static const struct rpc_call_ops nlmsvc_callback_ops = { 267 .rpc_call_done = nlmsvc_callback_exit, 268 .rpc_release = nlmsvc_callback_release, 269 }; 270 271 /* 272 * `Async' versions of the above service routines. They aren't really, 273 * because we send the callback before the reply proper. I hope this 274 * doesn't break any clients. 275 */ 276 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 277 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 278 { 279 struct nlm_host *host; 280 struct nlm_rqst *call; 281 __be32 stat; 282 283 host = nlmsvc_lookup_host(rqstp, 284 argp->lock.caller, 285 argp->lock.len); 286 if (host == NULL) 287 return rpc_system_err; 288 289 call = nlm_alloc_call(host); 290 if (call == NULL) 291 return rpc_system_err; 292 293 stat = func(rqstp, argp, &call->a_res); 294 if (stat != 0) { 295 nlm_release_call(call); 296 return stat; 297 } 298 299 call->a_flags = RPC_TASK_ASYNC; 300 if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0) 301 return rpc_system_err; 302 return rpc_success; 303 } 304 305 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 306 void *resp) 307 { 308 dprintk("lockd: TEST_MSG called\n"); 309 return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test); 310 } 311 312 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 313 void *resp) 314 { 315 dprintk("lockd: LOCK_MSG called\n"); 316 return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock); 317 } 318 319 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 320 void *resp) 321 { 322 dprintk("lockd: CANCEL_MSG called\n"); 323 return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel); 324 } 325 326 static __be32 327 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 328 void *resp) 329 { 330 dprintk("lockd: UNLOCK_MSG called\n"); 331 return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock); 332 } 333 334 static __be32 335 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 336 void *resp) 337 { 338 dprintk("lockd: GRANTED_MSG called\n"); 339 return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted); 340 } 341 342 /* 343 * SHARE: create a DOS share or alter existing share. 344 */ 345 static __be32 346 nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 347 struct nlm_res *resp) 348 { 349 struct nlm_host *host; 350 struct nlm_file *file; 351 352 dprintk("lockd: SHARE called\n"); 353 354 resp->cookie = argp->cookie; 355 356 /* Don't accept new lock requests during grace period */ 357 if (locks_in_grace() && !argp->reclaim) { 358 resp->status = nlm_lck_denied_grace_period; 359 return rpc_success; 360 } 361 362 /* Obtain client and file */ 363 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 364 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 365 366 /* Now try to create the share */ 367 resp->status = cast_status(nlmsvc_share_file(host, file, argp)); 368 369 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 370 nlm_release_host(host); 371 nlm_release_file(file); 372 return rpc_success; 373 } 374 375 /* 376 * UNSHARE: Release a DOS share. 377 */ 378 static __be32 379 nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 380 struct nlm_res *resp) 381 { 382 struct nlm_host *host; 383 struct nlm_file *file; 384 385 dprintk("lockd: UNSHARE called\n"); 386 387 resp->cookie = argp->cookie; 388 389 /* Don't accept requests during grace period */ 390 if (locks_in_grace()) { 391 resp->status = nlm_lck_denied_grace_period; 392 return rpc_success; 393 } 394 395 /* Obtain client and file */ 396 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 397 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 398 399 /* Now try to unshare the file */ 400 resp->status = cast_status(nlmsvc_unshare_file(host, file, argp)); 401 402 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 403 nlm_release_host(host); 404 nlm_release_file(file); 405 return rpc_success; 406 } 407 408 /* 409 * NM_LOCK: Create an unmonitored lock 410 */ 411 static __be32 412 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 413 struct nlm_res *resp) 414 { 415 dprintk("lockd: NM_LOCK called\n"); 416 417 argp->monitor = 0; /* just clean the monitor flag */ 418 return nlmsvc_proc_lock(rqstp, argp, resp); 419 } 420 421 /* 422 * FREE_ALL: Release all locks and shares held by client 423 */ 424 static __be32 425 nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 426 void *resp) 427 { 428 struct nlm_host *host; 429 430 /* Obtain client */ 431 if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL)) 432 return rpc_success; 433 434 nlmsvc_free_host_resources(host); 435 nlm_release_host(host); 436 return rpc_success; 437 } 438 439 /* 440 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 441 */ 442 static __be32 443 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 444 void *resp) 445 { 446 dprintk("lockd: SM_NOTIFY called\n"); 447 448 if (!nlm_privileged_requester(rqstp)) { 449 char buf[RPC_MAX_ADDRBUFLEN]; 450 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 451 svc_print_addr(rqstp, buf, sizeof(buf))); 452 return rpc_system_err; 453 } 454 455 nlm_host_rebooted(argp); 456 return rpc_success; 457 } 458 459 /* 460 * client sent a GRANTED_RES, let's remove the associated block 461 */ 462 static __be32 463 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 464 void *resp) 465 { 466 if (!nlmsvc_ops) 467 return rpc_success; 468 469 dprintk("lockd: GRANTED_RES called\n"); 470 471 nlmsvc_grant_reply(&argp->cookie, argp->status); 472 return rpc_success; 473 } 474 475 /* 476 * NLM Server procedures. 477 */ 478 479 #define nlmsvc_encode_norep nlmsvc_encode_void 480 #define nlmsvc_decode_norep nlmsvc_decode_void 481 #define nlmsvc_decode_testres nlmsvc_decode_void 482 #define nlmsvc_decode_lockres nlmsvc_decode_void 483 #define nlmsvc_decode_unlockres nlmsvc_decode_void 484 #define nlmsvc_decode_cancelres nlmsvc_decode_void 485 #define nlmsvc_decode_grantedres nlmsvc_decode_void 486 487 #define nlmsvc_proc_none nlmsvc_proc_null 488 #define nlmsvc_proc_test_res nlmsvc_proc_null 489 #define nlmsvc_proc_lock_res nlmsvc_proc_null 490 #define nlmsvc_proc_cancel_res nlmsvc_proc_null 491 #define nlmsvc_proc_unlock_res nlmsvc_proc_null 492 493 struct nlm_void { int dummy; }; 494 495 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 496 { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \ 497 .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \ 498 .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \ 499 .pc_release = NULL, \ 500 .pc_argsize = sizeof(struct nlm_##argt), \ 501 .pc_ressize = sizeof(struct nlm_##rest), \ 502 .pc_xdrressize = respsize, \ 503 } 504 505 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 506 #define St 1 /* status */ 507 #define No (1+1024/4) /* Net Obj */ 508 #define Rg 2 /* range - offset + size */ 509 510 struct svc_procedure nlmsvc_procedures[] = { 511 PROC(null, void, void, void, void, 1), 512 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 513 PROC(lock, lockargs, res, args, res, Ck+St), 514 PROC(cancel, cancargs, res, args, res, Ck+St), 515 PROC(unlock, unlockargs, res, args, res, Ck+St), 516 PROC(granted, testargs, res, args, res, Ck+St), 517 PROC(test_msg, testargs, norep, args, void, 1), 518 PROC(lock_msg, lockargs, norep, args, void, 1), 519 PROC(cancel_msg, cancargs, norep, args, void, 1), 520 PROC(unlock_msg, unlockargs, norep, args, void, 1), 521 PROC(granted_msg, testargs, norep, args, void, 1), 522 PROC(test_res, testres, norep, res, void, 1), 523 PROC(lock_res, lockres, norep, res, void, 1), 524 PROC(cancel_res, cancelres, norep, res, void, 1), 525 PROC(unlock_res, unlockres, norep, res, void, 1), 526 PROC(granted_res, res, norep, res, void, 1), 527 /* statd callback */ 528 PROC(sm_notify, reboot, void, reboot, void, 1), 529 PROC(none, void, void, void, void, 1), 530 PROC(none, void, void, void, void, 1), 531 PROC(none, void, void, void, void, 1), 532 PROC(share, shareargs, shareres, args, res, Ck+St+1), 533 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 534 PROC(nm_lock, lockargs, res, args, res, Ck+St), 535 PROC(free_all, notify, void, args, void, 0), 536 537 }; 538