1 /* 2 * linux/fs/lockd/svc4proc.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 /* 18 * Obtain client and file from arguments 19 */ 20 static __be32 21 nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, 22 struct nlm_host **hostp, struct nlm_file **filp) 23 { 24 struct nlm_host *host = NULL; 25 struct nlm_file *file = NULL; 26 struct nlm_lock *lock = &argp->lock; 27 __be32 error = 0; 28 29 /* nfsd callbacks must have been installed for this procedure */ 30 if (!nlmsvc_ops) 31 return nlm_lck_denied_nolocks; 32 33 /* Obtain host handle */ 34 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len)) 35 || (argp->monitor && nsm_monitor(host) < 0)) 36 goto no_locks; 37 *hostp = host; 38 39 /* Obtain file pointer. Not used by FREE_ALL call. */ 40 if (filp != NULL) { 41 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) 42 goto no_locks; 43 *filp = file; 44 45 /* Set up the missing parts of the file_lock structure */ 46 lock->fl.fl_file = file->f_file; 47 lock->fl.fl_owner = (fl_owner_t) host; 48 lock->fl.fl_lmops = &nlmsvc_lock_operations; 49 } 50 51 return 0; 52 53 no_locks: 54 nlmsvc_release_host(host); 55 if (error) 56 return error; 57 return nlm_lck_denied_nolocks; 58 } 59 60 /* 61 * NULL: Test for presence of service 62 */ 63 static __be32 64 nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 65 { 66 dprintk("lockd: NULL called\n"); 67 return rpc_success; 68 } 69 70 /* 71 * TEST: Check for conflicting lock 72 */ 73 static __be32 74 nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, 75 struct nlm_res *resp) 76 { 77 struct nlm_host *host; 78 struct nlm_file *file; 79 __be32 rc = rpc_success; 80 81 dprintk("lockd: TEST4 called\n"); 82 resp->cookie = argp->cookie; 83 84 /* Obtain client and file */ 85 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 86 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 87 88 /* Now check for conflicting locks */ 89 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie); 90 if (resp->status == nlm_drop_reply) 91 rc = rpc_drop_reply; 92 else 93 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status)); 94 95 nlmsvc_release_host(host); 96 nlm_release_file(file); 97 return rc; 98 } 99 100 static __be32 101 nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 102 struct nlm_res *resp) 103 { 104 struct nlm_host *host; 105 struct nlm_file *file; 106 __be32 rc = rpc_success; 107 108 dprintk("lockd: LOCK called\n"); 109 110 resp->cookie = argp->cookie; 111 112 /* Obtain client and file */ 113 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 114 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 115 116 #if 0 117 /* If supplied state doesn't match current state, we assume it's 118 * an old request that time-warped somehow. Any error return would 119 * do in this case because it's irrelevant anyway. 120 * 121 * NB: We don't retrieve the remote host's state yet. 122 */ 123 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 124 resp->status = nlm_lck_denied_nolocks; 125 } else 126 #endif 127 128 /* Now try to lock the file */ 129 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock, 130 argp->block, &argp->cookie, 131 argp->reclaim); 132 if (resp->status == nlm_drop_reply) 133 rc = rpc_drop_reply; 134 else 135 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 136 137 nlmsvc_release_host(host); 138 nlm_release_file(file); 139 return rc; 140 } 141 142 static __be32 143 nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 144 struct nlm_res *resp) 145 { 146 struct nlm_host *host; 147 struct nlm_file *file; 148 149 dprintk("lockd: CANCEL called\n"); 150 151 resp->cookie = argp->cookie; 152 153 /* Don't accept requests during grace period */ 154 if (locks_in_grace()) { 155 resp->status = nlm_lck_denied_grace_period; 156 return rpc_success; 157 } 158 159 /* Obtain client and file */ 160 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 161 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 162 163 /* Try to cancel request. */ 164 resp->status = nlmsvc_cancel_blocked(file, &argp->lock); 165 166 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 167 nlmsvc_release_host(host); 168 nlm_release_file(file); 169 return rpc_success; 170 } 171 172 /* 173 * UNLOCK: release a lock 174 */ 175 static __be32 176 nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 177 struct nlm_res *resp) 178 { 179 struct nlm_host *host; 180 struct nlm_file *file; 181 182 dprintk("lockd: UNLOCK called\n"); 183 184 resp->cookie = argp->cookie; 185 186 /* Don't accept new lock requests during grace period */ 187 if (locks_in_grace()) { 188 resp->status = nlm_lck_denied_grace_period; 189 return rpc_success; 190 } 191 192 /* Obtain client and file */ 193 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 194 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 195 196 /* Now try to remove the lock */ 197 resp->status = nlmsvc_unlock(file, &argp->lock); 198 199 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 200 nlmsvc_release_host(host); 201 nlm_release_file(file); 202 return rpc_success; 203 } 204 205 /* 206 * GRANTED: A server calls us to tell that a process' lock request 207 * was granted 208 */ 209 static __be32 210 nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 211 struct nlm_res *resp) 212 { 213 resp->cookie = argp->cookie; 214 215 dprintk("lockd: GRANTED called\n"); 216 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock); 217 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 218 return rpc_success; 219 } 220 221 /* 222 * This is the generic lockd callback for async RPC calls 223 */ 224 static void nlm4svc_callback_exit(struct rpc_task *task, void *data) 225 { 226 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 227 -task->tk_status); 228 } 229 230 static void nlm4svc_callback_release(void *data) 231 { 232 nlmsvc_release_call(data); 233 } 234 235 static const struct rpc_call_ops nlm4svc_callback_ops = { 236 .rpc_call_done = nlm4svc_callback_exit, 237 .rpc_release = nlm4svc_callback_release, 238 }; 239 240 /* 241 * `Async' versions of the above service routines. They aren't really, 242 * because we send the callback before the reply proper. I hope this 243 * doesn't break any clients. 244 */ 245 static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 246 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 247 { 248 struct nlm_host *host; 249 struct nlm_rqst *call; 250 __be32 stat; 251 252 host = nlmsvc_lookup_host(rqstp, 253 argp->lock.caller, 254 argp->lock.len); 255 if (host == NULL) 256 return rpc_system_err; 257 258 call = nlm_alloc_call(host); 259 if (call == NULL) 260 return rpc_system_err; 261 262 stat = func(rqstp, argp, &call->a_res); 263 if (stat != 0) { 264 nlmsvc_release_call(call); 265 return stat; 266 } 267 268 call->a_flags = RPC_TASK_ASYNC; 269 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0) 270 return rpc_system_err; 271 return rpc_success; 272 } 273 274 static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 275 void *resp) 276 { 277 dprintk("lockd: TEST_MSG called\n"); 278 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test); 279 } 280 281 static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 282 void *resp) 283 { 284 dprintk("lockd: LOCK_MSG called\n"); 285 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock); 286 } 287 288 static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 289 void *resp) 290 { 291 dprintk("lockd: CANCEL_MSG called\n"); 292 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel); 293 } 294 295 static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 296 void *resp) 297 { 298 dprintk("lockd: UNLOCK_MSG called\n"); 299 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock); 300 } 301 302 static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 303 void *resp) 304 { 305 dprintk("lockd: GRANTED_MSG called\n"); 306 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted); 307 } 308 309 /* 310 * SHARE: create a DOS share or alter existing share. 311 */ 312 static __be32 313 nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 314 struct nlm_res *resp) 315 { 316 struct nlm_host *host; 317 struct nlm_file *file; 318 319 dprintk("lockd: SHARE called\n"); 320 321 resp->cookie = argp->cookie; 322 323 /* Don't accept new lock requests during grace period */ 324 if (locks_in_grace() && !argp->reclaim) { 325 resp->status = nlm_lck_denied_grace_period; 326 return rpc_success; 327 } 328 329 /* Obtain client and file */ 330 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 331 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 332 333 /* Now try to create the share */ 334 resp->status = nlmsvc_share_file(host, file, argp); 335 336 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 337 nlmsvc_release_host(host); 338 nlm_release_file(file); 339 return rpc_success; 340 } 341 342 /* 343 * UNSHARE: Release a DOS share. 344 */ 345 static __be32 346 nlm4svc_proc_unshare(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: UNSHARE called\n"); 353 354 resp->cookie = argp->cookie; 355 356 /* Don't accept requests during grace period */ 357 if (locks_in_grace()) { 358 resp->status = nlm_lck_denied_grace_period; 359 return rpc_success; 360 } 361 362 /* Obtain client and file */ 363 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 364 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 365 366 /* Now try to lock the file */ 367 resp->status = nlmsvc_unshare_file(host, file, argp); 368 369 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 370 nlmsvc_release_host(host); 371 nlm_release_file(file); 372 return rpc_success; 373 } 374 375 /* 376 * NM_LOCK: Create an unmonitored lock 377 */ 378 static __be32 379 nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 380 struct nlm_res *resp) 381 { 382 dprintk("lockd: NM_LOCK called\n"); 383 384 argp->monitor = 0; /* just clean the monitor flag */ 385 return nlm4svc_proc_lock(rqstp, argp, resp); 386 } 387 388 /* 389 * FREE_ALL: Release all locks and shares held by client 390 */ 391 static __be32 392 nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 393 void *resp) 394 { 395 struct nlm_host *host; 396 397 /* Obtain client */ 398 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL)) 399 return rpc_success; 400 401 nlmsvc_free_host_resources(host); 402 nlmsvc_release_host(host); 403 return rpc_success; 404 } 405 406 /* 407 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 408 */ 409 static __be32 410 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 411 void *resp) 412 { 413 dprintk("lockd: SM_NOTIFY called\n"); 414 415 if (!nlm_privileged_requester(rqstp)) { 416 char buf[RPC_MAX_ADDRBUFLEN]; 417 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 418 svc_print_addr(rqstp, buf, sizeof(buf))); 419 return rpc_system_err; 420 } 421 422 nlm_host_rebooted(argp); 423 return rpc_success; 424 } 425 426 /* 427 * client sent a GRANTED_RES, let's remove the associated block 428 */ 429 static __be32 430 nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 431 void *resp) 432 { 433 if (!nlmsvc_ops) 434 return rpc_success; 435 436 dprintk("lockd: GRANTED_RES called\n"); 437 438 nlmsvc_grant_reply(&argp->cookie, argp->status); 439 return rpc_success; 440 } 441 442 443 /* 444 * NLM Server procedures. 445 */ 446 447 #define nlm4svc_encode_norep nlm4svc_encode_void 448 #define nlm4svc_decode_norep nlm4svc_decode_void 449 #define nlm4svc_decode_testres nlm4svc_decode_void 450 #define nlm4svc_decode_lockres nlm4svc_decode_void 451 #define nlm4svc_decode_unlockres nlm4svc_decode_void 452 #define nlm4svc_decode_cancelres nlm4svc_decode_void 453 #define nlm4svc_decode_grantedres nlm4svc_decode_void 454 455 #define nlm4svc_proc_none nlm4svc_proc_null 456 #define nlm4svc_proc_test_res nlm4svc_proc_null 457 #define nlm4svc_proc_lock_res nlm4svc_proc_null 458 #define nlm4svc_proc_cancel_res nlm4svc_proc_null 459 #define nlm4svc_proc_unlock_res nlm4svc_proc_null 460 461 struct nlm_void { int dummy; }; 462 463 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 464 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \ 465 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \ 466 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \ 467 .pc_release = NULL, \ 468 .pc_argsize = sizeof(struct nlm_##argt), \ 469 .pc_ressize = sizeof(struct nlm_##rest), \ 470 .pc_xdrressize = respsize, \ 471 } 472 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 473 #define No (1+1024/4) /* netobj */ 474 #define St 1 /* status */ 475 #define Rg 4 /* range (offset + length) */ 476 struct svc_procedure nlmsvc_procedures4[] = { 477 PROC(null, void, void, void, void, 1), 478 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 479 PROC(lock, lockargs, res, args, res, Ck+St), 480 PROC(cancel, cancargs, res, args, res, Ck+St), 481 PROC(unlock, unlockargs, res, args, res, Ck+St), 482 PROC(granted, testargs, res, args, res, Ck+St), 483 PROC(test_msg, testargs, norep, args, void, 1), 484 PROC(lock_msg, lockargs, norep, args, void, 1), 485 PROC(cancel_msg, cancargs, norep, args, void, 1), 486 PROC(unlock_msg, unlockargs, norep, args, void, 1), 487 PROC(granted_msg, testargs, norep, args, void, 1), 488 PROC(test_res, testres, norep, res, void, 1), 489 PROC(lock_res, lockres, norep, res, void, 1), 490 PROC(cancel_res, cancelres, norep, res, void, 1), 491 PROC(unlock_res, unlockres, norep, res, void, 1), 492 PROC(granted_res, res, norep, res, void, 1), 493 /* statd callback */ 494 PROC(sm_notify, reboot, void, reboot, void, 1), 495 PROC(none, void, void, void, void, 0), 496 PROC(none, void, void, void, void, 0), 497 PROC(none, void, void, void, void, 0), 498 PROC(share, shareargs, shareres, args, res, Ck+St+1), 499 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 500 PROC(nm_lock, lockargs, res, args, res, Ck+St), 501 PROC(free_all, notify, void, args, void, 1), 502 503 }; 504