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 15 #define NLMDBG_FACILITY NLMDBG_CLIENT 16 17 #ifdef CONFIG_LOCKD_V4 18 static __be32 19 cast_to_nlm(__be32 status, u32 vers) 20 { 21 /* Note: status is assumed to be in network byte order !!! */ 22 if (vers != 4){ 23 switch (status) { 24 case nlm_granted: 25 case nlm_lck_denied: 26 case nlm_lck_denied_nolocks: 27 case nlm_lck_blocked: 28 case nlm_lck_denied_grace_period: 29 case nlm_drop_reply: 30 break; 31 case nlm4_deadlock: 32 status = nlm_lck_denied; 33 break; 34 default: 35 status = nlm_lck_denied_nolocks; 36 } 37 } 38 39 return (status); 40 } 41 #define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers)) 42 #else 43 #define cast_status(status) (status) 44 #endif 45 46 /* 47 * Obtain client and file from arguments 48 */ 49 static __be32 50 nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, 51 struct nlm_host **hostp, struct nlm_file **filp) 52 { 53 struct nlm_host *host = NULL; 54 struct nlm_file *file = NULL; 55 struct nlm_lock *lock = &argp->lock; 56 __be32 error = 0; 57 58 /* nfsd callbacks must have been installed for this procedure */ 59 if (!nlmsvc_ops) 60 return nlm_lck_denied_nolocks; 61 62 /* Obtain host handle */ 63 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len)) 64 || (argp->monitor && nsm_monitor(host) < 0)) 65 goto no_locks; 66 *hostp = host; 67 68 /* Obtain file pointer. Not used by FREE_ALL call. */ 69 if (filp != NULL) { 70 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) 71 goto no_locks; 72 *filp = file; 73 74 /* Set up the missing parts of the file_lock structure */ 75 lock->fl.fl_file = file->f_file; 76 lock->fl.fl_owner = (fl_owner_t) host; 77 lock->fl.fl_lmops = &nlmsvc_lock_operations; 78 } 79 80 return 0; 81 82 no_locks: 83 nlm_release_host(host); 84 if (error) 85 return error; 86 return nlm_lck_denied_nolocks; 87 } 88 89 /* 90 * NULL: Test for presence of service 91 */ 92 static __be32 93 nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 94 { 95 dprintk("lockd: NULL called\n"); 96 return rpc_success; 97 } 98 99 /* 100 * TEST: Check for conflicting lock 101 */ 102 static __be32 103 nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, 104 struct nlm_res *resp) 105 { 106 struct nlm_host *host; 107 struct nlm_file *file; 108 __be32 rc = rpc_success; 109 110 dprintk("lockd: TEST called\n"); 111 resp->cookie = argp->cookie; 112 113 /* Obtain client and file */ 114 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 115 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 116 117 /* Now check for conflicting locks */ 118 resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie)); 119 if (resp->status == nlm_drop_reply) 120 rc = rpc_drop_reply; 121 else 122 dprintk("lockd: TEST status %d vers %d\n", 123 ntohl(resp->status), rqstp->rq_vers); 124 125 nlm_release_host(host); 126 nlm_release_file(file); 127 return rc; 128 } 129 130 static __be32 131 nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 132 struct nlm_res *resp) 133 { 134 struct nlm_host *host; 135 struct nlm_file *file; 136 __be32 rc = rpc_success; 137 138 dprintk("lockd: LOCK called\n"); 139 140 resp->cookie = argp->cookie; 141 142 /* Obtain client and file */ 143 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 144 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 145 146 #if 0 147 /* If supplied state doesn't match current state, we assume it's 148 * an old request that time-warped somehow. Any error return would 149 * do in this case because it's irrelevant anyway. 150 * 151 * NB: We don't retrieve the remote host's state yet. 152 */ 153 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 154 resp->status = nlm_lck_denied_nolocks; 155 } else 156 #endif 157 158 /* Now try to lock the file */ 159 resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock, 160 argp->block, &argp->cookie, 161 argp->reclaim)); 162 if (resp->status == nlm_drop_reply) 163 rc = rpc_drop_reply; 164 else 165 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 166 167 nlm_release_host(host); 168 nlm_release_file(file); 169 return rc; 170 } 171 172 static __be32 173 nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 174 struct nlm_res *resp) 175 { 176 struct nlm_host *host; 177 struct nlm_file *file; 178 179 dprintk("lockd: CANCEL called\n"); 180 181 resp->cookie = argp->cookie; 182 183 /* Don't accept requests during grace period */ 184 if (locks_in_grace()) { 185 resp->status = nlm_lck_denied_grace_period; 186 return rpc_success; 187 } 188 189 /* Obtain client and file */ 190 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 191 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 192 193 /* Try to cancel request. */ 194 resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock)); 195 196 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 197 nlm_release_host(host); 198 nlm_release_file(file); 199 return rpc_success; 200 } 201 202 /* 203 * UNLOCK: release a lock 204 */ 205 static __be32 206 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 207 struct nlm_res *resp) 208 { 209 struct nlm_host *host; 210 struct nlm_file *file; 211 212 dprintk("lockd: UNLOCK called\n"); 213 214 resp->cookie = argp->cookie; 215 216 /* Don't accept new lock requests during grace period */ 217 if (locks_in_grace()) { 218 resp->status = nlm_lck_denied_grace_period; 219 return rpc_success; 220 } 221 222 /* Obtain client and file */ 223 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 224 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 225 226 /* Now try to remove the lock */ 227 resp->status = cast_status(nlmsvc_unlock(file, &argp->lock)); 228 229 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 230 nlm_release_host(host); 231 nlm_release_file(file); 232 return rpc_success; 233 } 234 235 /* 236 * GRANTED: A server calls us to tell that a process' lock request 237 * was granted 238 */ 239 static __be32 240 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 241 struct nlm_res *resp) 242 { 243 resp->cookie = argp->cookie; 244 245 dprintk("lockd: GRANTED called\n"); 246 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock); 247 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 248 return rpc_success; 249 } 250 251 /* 252 * This is the generic lockd callback for async RPC calls 253 */ 254 static void nlmsvc_callback_exit(struct rpc_task *task, void *data) 255 { 256 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 257 -task->tk_status); 258 } 259 260 static void nlmsvc_callback_release(void *data) 261 { 262 nlm_release_call(data); 263 } 264 265 static const struct rpc_call_ops nlmsvc_callback_ops = { 266 .rpc_call_done = nlmsvc_callback_exit, 267 .rpc_release = nlmsvc_callback_release, 268 }; 269 270 /* 271 * `Async' versions of the above service routines. They aren't really, 272 * because we send the callback before the reply proper. I hope this 273 * doesn't break any clients. 274 */ 275 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 276 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 277 { 278 struct nlm_host *host; 279 struct nlm_rqst *call; 280 __be32 stat; 281 282 host = nlmsvc_lookup_host(rqstp, 283 argp->lock.caller, 284 argp->lock.len); 285 if (host == NULL) 286 return rpc_system_err; 287 288 call = nlm_alloc_call(host); 289 if (call == NULL) 290 return rpc_system_err; 291 292 stat = func(rqstp, argp, &call->a_res); 293 if (stat != 0) { 294 nlm_release_call(call); 295 return stat; 296 } 297 298 call->a_flags = RPC_TASK_ASYNC; 299 if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0) 300 return rpc_system_err; 301 return rpc_success; 302 } 303 304 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 305 void *resp) 306 { 307 dprintk("lockd: TEST_MSG called\n"); 308 return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test); 309 } 310 311 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 312 void *resp) 313 { 314 dprintk("lockd: LOCK_MSG called\n"); 315 return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock); 316 } 317 318 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 319 void *resp) 320 { 321 dprintk("lockd: CANCEL_MSG called\n"); 322 return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel); 323 } 324 325 static __be32 326 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 327 void *resp) 328 { 329 dprintk("lockd: UNLOCK_MSG called\n"); 330 return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock); 331 } 332 333 static __be32 334 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 335 void *resp) 336 { 337 dprintk("lockd: GRANTED_MSG called\n"); 338 return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted); 339 } 340 341 /* 342 * SHARE: create a DOS share or alter existing share. 343 */ 344 static __be32 345 nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 346 struct nlm_res *resp) 347 { 348 struct nlm_host *host; 349 struct nlm_file *file; 350 351 dprintk("lockd: SHARE called\n"); 352 353 resp->cookie = argp->cookie; 354 355 /* Don't accept new lock requests during grace period */ 356 if (locks_in_grace() && !argp->reclaim) { 357 resp->status = nlm_lck_denied_grace_period; 358 return rpc_success; 359 } 360 361 /* Obtain client and file */ 362 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 363 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 364 365 /* Now try to create the share */ 366 resp->status = cast_status(nlmsvc_share_file(host, file, argp)); 367 368 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 369 nlm_release_host(host); 370 nlm_release_file(file); 371 return rpc_success; 372 } 373 374 /* 375 * UNSHARE: Release a DOS share. 376 */ 377 static __be32 378 nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 379 struct nlm_res *resp) 380 { 381 struct nlm_host *host; 382 struct nlm_file *file; 383 384 dprintk("lockd: UNSHARE called\n"); 385 386 resp->cookie = argp->cookie; 387 388 /* Don't accept requests during grace period */ 389 if (locks_in_grace()) { 390 resp->status = nlm_lck_denied_grace_period; 391 return rpc_success; 392 } 393 394 /* Obtain client and file */ 395 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 396 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 397 398 /* Now try to unshare the file */ 399 resp->status = cast_status(nlmsvc_unshare_file(host, file, argp)); 400 401 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 402 nlm_release_host(host); 403 nlm_release_file(file); 404 return rpc_success; 405 } 406 407 /* 408 * NM_LOCK: Create an unmonitored lock 409 */ 410 static __be32 411 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 412 struct nlm_res *resp) 413 { 414 dprintk("lockd: NM_LOCK called\n"); 415 416 argp->monitor = 0; /* just clean the monitor flag */ 417 return nlmsvc_proc_lock(rqstp, argp, resp); 418 } 419 420 /* 421 * FREE_ALL: Release all locks and shares held by client 422 */ 423 static __be32 424 nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 425 void *resp) 426 { 427 struct nlm_host *host; 428 429 /* Obtain client */ 430 if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL)) 431 return rpc_success; 432 433 nlmsvc_free_host_resources(host); 434 nlm_release_host(host); 435 return rpc_success; 436 } 437 438 /* 439 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 440 */ 441 static __be32 442 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 443 void *resp) 444 { 445 dprintk("lockd: SM_NOTIFY called\n"); 446 447 if (!nlm_privileged_requester(rqstp)) { 448 char buf[RPC_MAX_ADDRBUFLEN]; 449 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 450 svc_print_addr(rqstp, buf, sizeof(buf))); 451 return rpc_system_err; 452 } 453 454 nlm_host_rebooted(argp); 455 return rpc_success; 456 } 457 458 /* 459 * client sent a GRANTED_RES, let's remove the associated block 460 */ 461 static __be32 462 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 463 void *resp) 464 { 465 if (!nlmsvc_ops) 466 return rpc_success; 467 468 dprintk("lockd: GRANTED_RES called\n"); 469 470 nlmsvc_grant_reply(&argp->cookie, argp->status); 471 return rpc_success; 472 } 473 474 /* 475 * NLM Server procedures. 476 */ 477 478 #define nlmsvc_encode_norep nlmsvc_encode_void 479 #define nlmsvc_decode_norep nlmsvc_decode_void 480 #define nlmsvc_decode_testres nlmsvc_decode_void 481 #define nlmsvc_decode_lockres nlmsvc_decode_void 482 #define nlmsvc_decode_unlockres nlmsvc_decode_void 483 #define nlmsvc_decode_cancelres nlmsvc_decode_void 484 #define nlmsvc_decode_grantedres nlmsvc_decode_void 485 486 #define nlmsvc_proc_none nlmsvc_proc_null 487 #define nlmsvc_proc_test_res nlmsvc_proc_null 488 #define nlmsvc_proc_lock_res nlmsvc_proc_null 489 #define nlmsvc_proc_cancel_res nlmsvc_proc_null 490 #define nlmsvc_proc_unlock_res nlmsvc_proc_null 491 492 struct nlm_void { int dummy; }; 493 494 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 495 { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \ 496 .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \ 497 .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \ 498 .pc_release = NULL, \ 499 .pc_argsize = sizeof(struct nlm_##argt), \ 500 .pc_ressize = sizeof(struct nlm_##rest), \ 501 .pc_xdrressize = respsize, \ 502 } 503 504 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 505 #define St 1 /* status */ 506 #define No (1+1024/4) /* Net Obj */ 507 #define Rg 2 /* range - offset + size */ 508 509 struct svc_procedure nlmsvc_procedures[] = { 510 PROC(null, void, void, void, void, 1), 511 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 512 PROC(lock, lockargs, res, args, res, Ck+St), 513 PROC(cancel, cancargs, res, args, res, Ck+St), 514 PROC(unlock, unlockargs, res, args, res, Ck+St), 515 PROC(granted, testargs, res, args, res, Ck+St), 516 PROC(test_msg, testargs, norep, args, void, 1), 517 PROC(lock_msg, lockargs, norep, args, void, 1), 518 PROC(cancel_msg, cancargs, norep, args, void, 1), 519 PROC(unlock_msg, unlockargs, norep, args, void, 1), 520 PROC(granted_msg, testargs, norep, args, void, 1), 521 PROC(test_res, testres, norep, res, void, 1), 522 PROC(lock_res, lockres, norep, res, void, 1), 523 PROC(cancel_res, cancelres, norep, res, void, 1), 524 PROC(unlock_res, unlockres, norep, res, void, 1), 525 PROC(granted_res, res, norep, res, void, 1), 526 /* statd callback */ 527 PROC(sm_notify, reboot, void, reboot, void, 1), 528 PROC(none, void, void, void, void, 1), 529 PROC(none, void, void, void, void, 1), 530 PROC(none, void, void, void, void, 1), 531 PROC(share, shareargs, shareres, args, res, Ck+St+1), 532 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 533 PROC(nm_lock, lockargs, res, args, res, Ck+St), 534 PROC(free_all, notify, void, args, void, 0), 535 536 }; 537