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/smp_lock.h> 13 #include <linux/lockd/lockd.h> 14 #include <linux/lockd/share.h> 15 16 #define NLMDBG_FACILITY NLMDBG_CLIENT 17 18 /* 19 * Obtain client and file from arguments 20 */ 21 static __be32 22 nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, 23 struct nlm_host **hostp, struct nlm_file **filp) 24 { 25 struct nlm_host *host = NULL; 26 struct nlm_file *file = NULL; 27 struct nlm_lock *lock = &argp->lock; 28 __be32 error = 0; 29 30 /* nfsd callbacks must have been installed for this procedure */ 31 if (!nlmsvc_ops) 32 return nlm_lck_denied_nolocks; 33 34 /* Obtain host handle */ 35 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len)) 36 || (argp->monitor && nsm_monitor(host) < 0)) 37 goto no_locks; 38 *hostp = host; 39 40 /* Obtain file pointer. Not used by FREE_ALL call. */ 41 if (filp != NULL) { 42 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) 43 goto no_locks; 44 *filp = file; 45 46 /* Set up the missing parts of the file_lock structure */ 47 lock->fl.fl_file = file->f_file; 48 lock->fl.fl_owner = (fl_owner_t) host; 49 lock->fl.fl_lmops = &nlmsvc_lock_operations; 50 } 51 52 return 0; 53 54 no_locks: 55 nlm_release_host(host); 56 if (error) 57 return error; 58 return nlm_lck_denied_nolocks; 59 } 60 61 /* 62 * NULL: Test for presence of service 63 */ 64 static __be32 65 nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 66 { 67 dprintk("lockd: NULL called\n"); 68 return rpc_success; 69 } 70 71 /* 72 * TEST: Check for conflicting lock 73 */ 74 static __be32 75 nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, 76 struct nlm_res *resp) 77 { 78 struct nlm_host *host; 79 struct nlm_file *file; 80 __be32 rc = rpc_success; 81 82 dprintk("lockd: TEST4 called\n"); 83 resp->cookie = argp->cookie; 84 85 /* Obtain client and file */ 86 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 87 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 88 89 /* Now check for conflicting locks */ 90 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie); 91 if (resp->status == nlm_drop_reply) 92 rc = rpc_drop_reply; 93 else 94 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status)); 95 96 nlm_release_host(host); 97 nlm_release_file(file); 98 return rc; 99 } 100 101 static __be32 102 nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 103 struct nlm_res *resp) 104 { 105 struct nlm_host *host; 106 struct nlm_file *file; 107 __be32 rc = rpc_success; 108 109 dprintk("lockd: LOCK called\n"); 110 111 resp->cookie = argp->cookie; 112 113 /* Obtain client and file */ 114 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 115 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 116 117 #if 0 118 /* If supplied state doesn't match current state, we assume it's 119 * an old request that time-warped somehow. Any error return would 120 * do in this case because it's irrelevant anyway. 121 * 122 * NB: We don't retrieve the remote host's state yet. 123 */ 124 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 125 resp->status = nlm_lck_denied_nolocks; 126 } else 127 #endif 128 129 /* Now try to lock the file */ 130 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock, 131 argp->block, &argp->cookie, 132 argp->reclaim); 133 if (resp->status == nlm_drop_reply) 134 rc = rpc_drop_reply; 135 else 136 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 137 138 nlm_release_host(host); 139 nlm_release_file(file); 140 return rc; 141 } 142 143 static __be32 144 nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 145 struct nlm_res *resp) 146 { 147 struct nlm_host *host; 148 struct nlm_file *file; 149 150 dprintk("lockd: CANCEL called\n"); 151 152 resp->cookie = argp->cookie; 153 154 /* Don't accept requests during grace period */ 155 if (locks_in_grace()) { 156 resp->status = nlm_lck_denied_grace_period; 157 return rpc_success; 158 } 159 160 /* Obtain client and file */ 161 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 162 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 163 164 /* Try to cancel request. */ 165 resp->status = nlmsvc_cancel_blocked(file, &argp->lock); 166 167 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 168 nlm_release_host(host); 169 nlm_release_file(file); 170 return rpc_success; 171 } 172 173 /* 174 * UNLOCK: release a lock 175 */ 176 static __be32 177 nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 178 struct nlm_res *resp) 179 { 180 struct nlm_host *host; 181 struct nlm_file *file; 182 183 dprintk("lockd: UNLOCK called\n"); 184 185 resp->cookie = argp->cookie; 186 187 /* Don't accept new lock requests during grace period */ 188 if (locks_in_grace()) { 189 resp->status = nlm_lck_denied_grace_period; 190 return rpc_success; 191 } 192 193 /* Obtain client and file */ 194 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 195 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 196 197 /* Now try to remove the lock */ 198 resp->status = nlmsvc_unlock(file, &argp->lock); 199 200 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 201 nlm_release_host(host); 202 nlm_release_file(file); 203 return rpc_success; 204 } 205 206 /* 207 * GRANTED: A server calls us to tell that a process' lock request 208 * was granted 209 */ 210 static __be32 211 nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 212 struct nlm_res *resp) 213 { 214 resp->cookie = argp->cookie; 215 216 dprintk("lockd: GRANTED called\n"); 217 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock); 218 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 219 return rpc_success; 220 } 221 222 /* 223 * This is the generic lockd callback for async RPC calls 224 */ 225 static void nlm4svc_callback_exit(struct rpc_task *task, void *data) 226 { 227 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 228 -task->tk_status); 229 } 230 231 static void nlm4svc_callback_release(void *data) 232 { 233 lock_kernel(); 234 nlm_release_call(data); 235 unlock_kernel(); 236 } 237 238 static const struct rpc_call_ops nlm4svc_callback_ops = { 239 .rpc_call_done = nlm4svc_callback_exit, 240 .rpc_release = nlm4svc_callback_release, 241 }; 242 243 /* 244 * `Async' versions of the above service routines. They aren't really, 245 * because we send the callback before the reply proper. I hope this 246 * doesn't break any clients. 247 */ 248 static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 249 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 250 { 251 struct nlm_host *host; 252 struct nlm_rqst *call; 253 __be32 stat; 254 255 host = nlmsvc_lookup_host(rqstp, 256 argp->lock.caller, 257 argp->lock.len); 258 if (host == NULL) 259 return rpc_system_err; 260 261 call = nlm_alloc_call(host); 262 if (call == NULL) 263 return rpc_system_err; 264 265 stat = func(rqstp, argp, &call->a_res); 266 if (stat != 0) { 267 nlm_release_call(call); 268 return stat; 269 } 270 271 call->a_flags = RPC_TASK_ASYNC; 272 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0) 273 return rpc_system_err; 274 return rpc_success; 275 } 276 277 static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 278 void *resp) 279 { 280 dprintk("lockd: TEST_MSG called\n"); 281 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test); 282 } 283 284 static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 285 void *resp) 286 { 287 dprintk("lockd: LOCK_MSG called\n"); 288 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock); 289 } 290 291 static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 292 void *resp) 293 { 294 dprintk("lockd: CANCEL_MSG called\n"); 295 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel); 296 } 297 298 static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 299 void *resp) 300 { 301 dprintk("lockd: UNLOCK_MSG called\n"); 302 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock); 303 } 304 305 static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 306 void *resp) 307 { 308 dprintk("lockd: GRANTED_MSG called\n"); 309 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted); 310 } 311 312 /* 313 * SHARE: create a DOS share or alter existing share. 314 */ 315 static __be32 316 nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 317 struct nlm_res *resp) 318 { 319 struct nlm_host *host; 320 struct nlm_file *file; 321 322 dprintk("lockd: SHARE called\n"); 323 324 resp->cookie = argp->cookie; 325 326 /* Don't accept new lock requests during grace period */ 327 if (locks_in_grace() && !argp->reclaim) { 328 resp->status = nlm_lck_denied_grace_period; 329 return rpc_success; 330 } 331 332 /* Obtain client and file */ 333 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 334 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 335 336 /* Now try to create the share */ 337 resp->status = nlmsvc_share_file(host, file, argp); 338 339 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 340 nlm_release_host(host); 341 nlm_release_file(file); 342 return rpc_success; 343 } 344 345 /* 346 * UNSHARE: Release a DOS share. 347 */ 348 static __be32 349 nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 350 struct nlm_res *resp) 351 { 352 struct nlm_host *host; 353 struct nlm_file *file; 354 355 dprintk("lockd: UNSHARE called\n"); 356 357 resp->cookie = argp->cookie; 358 359 /* Don't accept requests during grace period */ 360 if (locks_in_grace()) { 361 resp->status = nlm_lck_denied_grace_period; 362 return rpc_success; 363 } 364 365 /* Obtain client and file */ 366 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 367 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 368 369 /* Now try to lock the file */ 370 resp->status = nlmsvc_unshare_file(host, file, argp); 371 372 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 373 nlm_release_host(host); 374 nlm_release_file(file); 375 return rpc_success; 376 } 377 378 /* 379 * NM_LOCK: Create an unmonitored lock 380 */ 381 static __be32 382 nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 383 struct nlm_res *resp) 384 { 385 dprintk("lockd: NM_LOCK called\n"); 386 387 argp->monitor = 0; /* just clean the monitor flag */ 388 return nlm4svc_proc_lock(rqstp, argp, resp); 389 } 390 391 /* 392 * FREE_ALL: Release all locks and shares held by client 393 */ 394 static __be32 395 nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 396 void *resp) 397 { 398 struct nlm_host *host; 399 400 /* Obtain client */ 401 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL)) 402 return rpc_success; 403 404 nlmsvc_free_host_resources(host); 405 nlm_release_host(host); 406 return rpc_success; 407 } 408 409 /* 410 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 411 */ 412 static __be32 413 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 414 void *resp) 415 { 416 dprintk("lockd: SM_NOTIFY called\n"); 417 418 if (!nlm_privileged_requester(rqstp)) { 419 char buf[RPC_MAX_ADDRBUFLEN]; 420 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 421 svc_print_addr(rqstp, buf, sizeof(buf))); 422 return rpc_system_err; 423 } 424 425 nlm_host_rebooted(argp); 426 return rpc_success; 427 } 428 429 /* 430 * client sent a GRANTED_RES, let's remove the associated block 431 */ 432 static __be32 433 nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 434 void *resp) 435 { 436 if (!nlmsvc_ops) 437 return rpc_success; 438 439 dprintk("lockd: GRANTED_RES called\n"); 440 441 nlmsvc_grant_reply(&argp->cookie, argp->status); 442 return rpc_success; 443 } 444 445 446 /* 447 * NLM Server procedures. 448 */ 449 450 #define nlm4svc_encode_norep nlm4svc_encode_void 451 #define nlm4svc_decode_norep nlm4svc_decode_void 452 #define nlm4svc_decode_testres nlm4svc_decode_void 453 #define nlm4svc_decode_lockres nlm4svc_decode_void 454 #define nlm4svc_decode_unlockres nlm4svc_decode_void 455 #define nlm4svc_decode_cancelres nlm4svc_decode_void 456 #define nlm4svc_decode_grantedres nlm4svc_decode_void 457 458 #define nlm4svc_proc_none nlm4svc_proc_null 459 #define nlm4svc_proc_test_res nlm4svc_proc_null 460 #define nlm4svc_proc_lock_res nlm4svc_proc_null 461 #define nlm4svc_proc_cancel_res nlm4svc_proc_null 462 #define nlm4svc_proc_unlock_res nlm4svc_proc_null 463 464 struct nlm_void { int dummy; }; 465 466 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 467 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \ 468 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \ 469 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \ 470 .pc_release = NULL, \ 471 .pc_argsize = sizeof(struct nlm_##argt), \ 472 .pc_ressize = sizeof(struct nlm_##rest), \ 473 .pc_xdrressize = respsize, \ 474 } 475 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 476 #define No (1+1024/4) /* netobj */ 477 #define St 1 /* status */ 478 #define Rg 4 /* range (offset + length) */ 479 struct svc_procedure nlmsvc_procedures4[] = { 480 PROC(null, void, void, void, void, 1), 481 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 482 PROC(lock, lockargs, res, args, res, Ck+St), 483 PROC(cancel, cancargs, res, args, res, Ck+St), 484 PROC(unlock, unlockargs, res, args, res, Ck+St), 485 PROC(granted, testargs, res, args, res, Ck+St), 486 PROC(test_msg, testargs, norep, args, void, 1), 487 PROC(lock_msg, lockargs, norep, args, void, 1), 488 PROC(cancel_msg, cancargs, norep, args, void, 1), 489 PROC(unlock_msg, unlockargs, norep, args, void, 1), 490 PROC(granted_msg, testargs, norep, args, void, 1), 491 PROC(test_res, testres, norep, res, void, 1), 492 PROC(lock_res, lockres, norep, res, void, 1), 493 PROC(cancel_res, cancelres, norep, res, void, 1), 494 PROC(unlock_res, unlockres, norep, res, void, 1), 495 PROC(granted_res, res, norep, res, void, 1), 496 /* statd callback */ 497 PROC(sm_notify, reboot, void, reboot, void, 1), 498 PROC(none, void, void, void, void, 0), 499 PROC(none, void, void, void, void, 0), 500 PROC(none, void, void, void, void, 0), 501 PROC(share, shareargs, shareres, args, res, Ck+St+1), 502 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 503 PROC(nm_lock, lockargs, res, args, res, Ck+St), 504 PROC(free_all, notify, void, args, void, 1), 505 506 }; 507