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, void *argp, void *resp) 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_args *argp, 106 struct nlm_res *resp) 107 { 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_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 134 struct nlm_res *resp) 135 { 136 struct nlm_host *host; 137 struct nlm_file *file; 138 __be32 rc = rpc_success; 139 140 dprintk("lockd: LOCK called\n"); 141 142 resp->cookie = argp->cookie; 143 144 /* Obtain client and file */ 145 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 146 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 147 148 #if 0 149 /* If supplied state doesn't match current state, we assume it's 150 * an old request that time-warped somehow. Any error return would 151 * do in this case because it's irrelevant anyway. 152 * 153 * NB: We don't retrieve the remote host's state yet. 154 */ 155 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 156 resp->status = nlm_lck_denied_nolocks; 157 } else 158 #endif 159 160 /* Now try to lock the file */ 161 resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock, 162 argp->block, &argp->cookie, 163 argp->reclaim)); 164 if (resp->status == nlm_drop_reply) 165 rc = rpc_drop_reply; 166 else 167 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 168 169 nlmsvc_release_host(host); 170 nlm_release_file(file); 171 return rc; 172 } 173 174 static __be32 175 nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 176 struct nlm_res *resp) 177 { 178 struct nlm_host *host; 179 struct nlm_file *file; 180 struct net *net = SVC_NET(rqstp); 181 182 dprintk("lockd: CANCEL called\n"); 183 184 resp->cookie = argp->cookie; 185 186 /* Don't accept requests during grace period */ 187 if (locks_in_grace(net)) { 188 resp->status = nlm_lck_denied_grace_period; 189 return rpc_success; 190 } 191 192 /* Obtain client and file */ 193 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 194 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 195 196 /* Try to cancel request. */ 197 resp->status = cast_status(nlmsvc_cancel_blocked(net, file, &argp->lock)); 198 199 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 200 nlmsvc_release_host(host); 201 nlm_release_file(file); 202 return rpc_success; 203 } 204 205 /* 206 * UNLOCK: release a lock 207 */ 208 static __be32 209 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 210 struct nlm_res *resp) 211 { 212 struct nlm_host *host; 213 struct nlm_file *file; 214 struct net *net = SVC_NET(rqstp); 215 216 dprintk("lockd: UNLOCK called\n"); 217 218 resp->cookie = argp->cookie; 219 220 /* Don't accept new lock requests during grace period */ 221 if (locks_in_grace(net)) { 222 resp->status = nlm_lck_denied_grace_period; 223 return rpc_success; 224 } 225 226 /* Obtain client and file */ 227 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 228 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 229 230 /* Now try to remove the lock */ 231 resp->status = cast_status(nlmsvc_unlock(net, file, &argp->lock)); 232 233 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 234 nlmsvc_release_host(host); 235 nlm_release_file(file); 236 return rpc_success; 237 } 238 239 /* 240 * GRANTED: A server calls us to tell that a process' lock request 241 * was granted 242 */ 243 static __be32 244 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 245 struct nlm_res *resp) 246 { 247 resp->cookie = argp->cookie; 248 249 dprintk("lockd: GRANTED called\n"); 250 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock); 251 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 252 return rpc_success; 253 } 254 255 /* 256 * This is the generic lockd callback for async RPC calls 257 */ 258 static void nlmsvc_callback_exit(struct rpc_task *task, void *data) 259 { 260 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 261 -task->tk_status); 262 } 263 264 void nlmsvc_release_call(struct nlm_rqst *call) 265 { 266 if (!atomic_dec_and_test(&call->a_count)) 267 return; 268 nlmsvc_release_host(call->a_host); 269 kfree(call); 270 } 271 272 static void nlmsvc_callback_release(void *data) 273 { 274 nlmsvc_release_call(data); 275 } 276 277 static const struct rpc_call_ops nlmsvc_callback_ops = { 278 .rpc_call_done = nlmsvc_callback_exit, 279 .rpc_release = nlmsvc_callback_release, 280 }; 281 282 /* 283 * `Async' versions of the above service routines. They aren't really, 284 * because we send the callback before the reply proper. I hope this 285 * doesn't break any clients. 286 */ 287 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 288 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 289 { 290 struct nlm_host *host; 291 struct nlm_rqst *call; 292 __be32 stat; 293 294 host = nlmsvc_lookup_host(rqstp, 295 argp->lock.caller, 296 argp->lock.len); 297 if (host == NULL) 298 return rpc_system_err; 299 300 call = nlm_alloc_call(host); 301 nlmsvc_release_host(host); 302 if (call == NULL) 303 return rpc_system_err; 304 305 stat = func(rqstp, argp, &call->a_res); 306 if (stat != 0) { 307 nlmsvc_release_call(call); 308 return stat; 309 } 310 311 call->a_flags = RPC_TASK_ASYNC; 312 if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0) 313 return rpc_system_err; 314 return rpc_success; 315 } 316 317 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 318 void *resp) 319 { 320 dprintk("lockd: TEST_MSG called\n"); 321 return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test); 322 } 323 324 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 325 void *resp) 326 { 327 dprintk("lockd: LOCK_MSG called\n"); 328 return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock); 329 } 330 331 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 332 void *resp) 333 { 334 dprintk("lockd: CANCEL_MSG called\n"); 335 return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel); 336 } 337 338 static __be32 339 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 340 void *resp) 341 { 342 dprintk("lockd: UNLOCK_MSG called\n"); 343 return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock); 344 } 345 346 static __be32 347 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 348 void *resp) 349 { 350 dprintk("lockd: GRANTED_MSG called\n"); 351 return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted); 352 } 353 354 /* 355 * SHARE: create a DOS share or alter existing share. 356 */ 357 static __be32 358 nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 359 struct nlm_res *resp) 360 { 361 struct nlm_host *host; 362 struct nlm_file *file; 363 364 dprintk("lockd: SHARE called\n"); 365 366 resp->cookie = argp->cookie; 367 368 /* Don't accept new lock requests during grace period */ 369 if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) { 370 resp->status = nlm_lck_denied_grace_period; 371 return rpc_success; 372 } 373 374 /* Obtain client and file */ 375 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 376 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 377 378 /* Now try to create the share */ 379 resp->status = cast_status(nlmsvc_share_file(host, file, argp)); 380 381 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 382 nlmsvc_release_host(host); 383 nlm_release_file(file); 384 return rpc_success; 385 } 386 387 /* 388 * UNSHARE: Release a DOS share. 389 */ 390 static __be32 391 nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 392 struct nlm_res *resp) 393 { 394 struct nlm_host *host; 395 struct nlm_file *file; 396 397 dprintk("lockd: UNSHARE called\n"); 398 399 resp->cookie = argp->cookie; 400 401 /* Don't accept requests during grace period */ 402 if (locks_in_grace(SVC_NET(rqstp))) { 403 resp->status = nlm_lck_denied_grace_period; 404 return rpc_success; 405 } 406 407 /* Obtain client and file */ 408 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 409 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 410 411 /* Now try to unshare the file */ 412 resp->status = cast_status(nlmsvc_unshare_file(host, file, argp)); 413 414 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 415 nlmsvc_release_host(host); 416 nlm_release_file(file); 417 return rpc_success; 418 } 419 420 /* 421 * NM_LOCK: Create an unmonitored lock 422 */ 423 static __be32 424 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 425 struct nlm_res *resp) 426 { 427 dprintk("lockd: NM_LOCK called\n"); 428 429 argp->monitor = 0; /* just clean the monitor flag */ 430 return nlmsvc_proc_lock(rqstp, argp, resp); 431 } 432 433 /* 434 * FREE_ALL: Release all locks and shares held by client 435 */ 436 static __be32 437 nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 438 void *resp) 439 { 440 struct nlm_host *host; 441 442 /* Obtain client */ 443 if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL)) 444 return rpc_success; 445 446 nlmsvc_free_host_resources(host); 447 nlmsvc_release_host(host); 448 return rpc_success; 449 } 450 451 /* 452 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 453 */ 454 static __be32 455 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 456 void *resp) 457 { 458 dprintk("lockd: SM_NOTIFY called\n"); 459 460 if (!nlm_privileged_requester(rqstp)) { 461 char buf[RPC_MAX_ADDRBUFLEN]; 462 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 463 svc_print_addr(rqstp, buf, sizeof(buf))); 464 return rpc_system_err; 465 } 466 467 nlm_host_rebooted(SVC_NET(rqstp), argp); 468 return rpc_success; 469 } 470 471 /* 472 * client sent a GRANTED_RES, let's remove the associated block 473 */ 474 static __be32 475 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 476 void *resp) 477 { 478 if (!nlmsvc_ops) 479 return rpc_success; 480 481 dprintk("lockd: GRANTED_RES called\n"); 482 483 nlmsvc_grant_reply(&argp->cookie, argp->status); 484 return rpc_success; 485 } 486 487 /* 488 * NLM Server procedures. 489 */ 490 491 #define nlmsvc_encode_norep nlmsvc_encode_void 492 #define nlmsvc_decode_norep nlmsvc_decode_void 493 #define nlmsvc_decode_testres nlmsvc_decode_void 494 #define nlmsvc_decode_lockres nlmsvc_decode_void 495 #define nlmsvc_decode_unlockres nlmsvc_decode_void 496 #define nlmsvc_decode_cancelres nlmsvc_decode_void 497 #define nlmsvc_decode_grantedres nlmsvc_decode_void 498 499 #define nlmsvc_proc_none nlmsvc_proc_null 500 #define nlmsvc_proc_test_res nlmsvc_proc_null 501 #define nlmsvc_proc_lock_res nlmsvc_proc_null 502 #define nlmsvc_proc_cancel_res nlmsvc_proc_null 503 #define nlmsvc_proc_unlock_res nlmsvc_proc_null 504 505 struct nlm_void { int dummy; }; 506 507 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 508 { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \ 509 .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \ 510 .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \ 511 .pc_release = NULL, \ 512 .pc_argsize = sizeof(struct nlm_##argt), \ 513 .pc_ressize = sizeof(struct nlm_##rest), \ 514 .pc_xdrressize = respsize, \ 515 } 516 517 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 518 #define St 1 /* status */ 519 #define No (1+1024/4) /* Net Obj */ 520 #define Rg 2 /* range - offset + size */ 521 522 struct svc_procedure nlmsvc_procedures[] = { 523 PROC(null, void, void, void, void, 1), 524 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 525 PROC(lock, lockargs, res, args, res, Ck+St), 526 PROC(cancel, cancargs, res, args, res, Ck+St), 527 PROC(unlock, unlockargs, res, args, res, Ck+St), 528 PROC(granted, testargs, res, args, res, Ck+St), 529 PROC(test_msg, testargs, norep, args, void, 1), 530 PROC(lock_msg, lockargs, norep, args, void, 1), 531 PROC(cancel_msg, cancargs, norep, args, void, 1), 532 PROC(unlock_msg, unlockargs, norep, args, void, 1), 533 PROC(granted_msg, testargs, norep, args, void, 1), 534 PROC(test_res, testres, norep, res, void, 1), 535 PROC(lock_res, lockres, norep, res, void, 1), 536 PROC(cancel_res, cancelres, norep, res, void, 1), 537 PROC(unlock_res, unlockres, norep, res, void, 1), 538 PROC(granted_res, res, norep, res, void, 1), 539 /* statd callback */ 540 PROC(sm_notify, reboot, void, reboot, void, 1), 541 PROC(none, void, void, void, void, 1), 542 PROC(none, void, void, void, void, 1), 543 PROC(none, void, void, void, void, 1), 544 PROC(share, shareargs, shareres, args, res, Ck+St+1), 545 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 546 PROC(nm_lock, lockargs, res, args, res, Ck+St), 547 PROC(free_all, notify, void, args, void, 0), 548 549 }; 550