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/slab.h> 13 #include <linux/smp_lock.h> 14 #include <linux/lockd/lockd.h> 15 #include <linux/lockd/share.h> 16 17 #define NLMDBG_FACILITY NLMDBG_CLIENT 18 19 /* 20 * Obtain client and file from arguments 21 */ 22 static __be32 23 nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, 24 struct nlm_host **hostp, struct nlm_file **filp) 25 { 26 struct nlm_host *host = NULL; 27 struct nlm_file *file = NULL; 28 struct nlm_lock *lock = &argp->lock; 29 __be32 error = 0; 30 31 /* nfsd callbacks must have been installed for this procedure */ 32 if (!nlmsvc_ops) 33 return nlm_lck_denied_nolocks; 34 35 /* Obtain host handle */ 36 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len)) 37 || (argp->monitor && nsm_monitor(host) < 0)) 38 goto no_locks; 39 *hostp = host; 40 41 /* Obtain file pointer. Not used by FREE_ALL call. */ 42 if (filp != NULL) { 43 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) 44 goto no_locks; 45 *filp = file; 46 47 /* Set up the missing parts of the file_lock structure */ 48 lock->fl.fl_file = file->f_file; 49 lock->fl.fl_owner = (fl_owner_t) host; 50 lock->fl.fl_lmops = &nlmsvc_lock_operations; 51 } 52 53 return 0; 54 55 no_locks: 56 nlm_release_host(host); 57 if (error) 58 return error; 59 return nlm_lck_denied_nolocks; 60 } 61 62 /* 63 * NULL: Test for presence of service 64 */ 65 static __be32 66 nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 67 { 68 dprintk("lockd: NULL called\n"); 69 return rpc_success; 70 } 71 72 /* 73 * TEST: Check for conflicting lock 74 */ 75 static __be32 76 nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, 77 struct nlm_res *resp) 78 { 79 struct nlm_host *host; 80 struct nlm_file *file; 81 __be32 rc = rpc_success; 82 83 dprintk("lockd: TEST4 called\n"); 84 resp->cookie = argp->cookie; 85 86 /* Obtain client and file */ 87 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 88 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 89 90 /* Now check for conflicting locks */ 91 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie); 92 if (resp->status == nlm_drop_reply) 93 rc = rpc_drop_reply; 94 else 95 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status)); 96 97 nlm_release_host(host); 98 nlm_release_file(file); 99 return rc; 100 } 101 102 static __be32 103 nlm4svc_proc_lock(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: LOCK called\n"); 111 112 resp->cookie = argp->cookie; 113 114 /* Obtain client and file */ 115 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 116 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 117 118 #if 0 119 /* If supplied state doesn't match current state, we assume it's 120 * an old request that time-warped somehow. Any error return would 121 * do in this case because it's irrelevant anyway. 122 * 123 * NB: We don't retrieve the remote host's state yet. 124 */ 125 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 126 resp->status = nlm_lck_denied_nolocks; 127 } else 128 #endif 129 130 /* Now try to lock the file */ 131 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock, 132 argp->block, &argp->cookie, 133 argp->reclaim); 134 if (resp->status == nlm_drop_reply) 135 rc = rpc_drop_reply; 136 else 137 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 138 139 nlm_release_host(host); 140 nlm_release_file(file); 141 return rc; 142 } 143 144 static __be32 145 nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 146 struct nlm_res *resp) 147 { 148 struct nlm_host *host; 149 struct nlm_file *file; 150 151 dprintk("lockd: CANCEL called\n"); 152 153 resp->cookie = argp->cookie; 154 155 /* Don't accept requests during grace period */ 156 if (locks_in_grace()) { 157 resp->status = nlm_lck_denied_grace_period; 158 return rpc_success; 159 } 160 161 /* Obtain client and file */ 162 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 163 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 164 165 /* Try to cancel request. */ 166 resp->status = nlmsvc_cancel_blocked(file, &argp->lock); 167 168 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 169 nlm_release_host(host); 170 nlm_release_file(file); 171 return rpc_success; 172 } 173 174 /* 175 * UNLOCK: release a lock 176 */ 177 static __be32 178 nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 179 struct nlm_res *resp) 180 { 181 struct nlm_host *host; 182 struct nlm_file *file; 183 184 dprintk("lockd: UNLOCK called\n"); 185 186 resp->cookie = argp->cookie; 187 188 /* Don't accept new lock requests during grace period */ 189 if (locks_in_grace()) { 190 resp->status = nlm_lck_denied_grace_period; 191 return rpc_success; 192 } 193 194 /* Obtain client and file */ 195 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 196 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 197 198 /* Now try to remove the lock */ 199 resp->status = nlmsvc_unlock(file, &argp->lock); 200 201 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 202 nlm_release_host(host); 203 nlm_release_file(file); 204 return rpc_success; 205 } 206 207 /* 208 * GRANTED: A server calls us to tell that a process' lock request 209 * was granted 210 */ 211 static __be32 212 nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 213 struct nlm_res *resp) 214 { 215 resp->cookie = argp->cookie; 216 217 dprintk("lockd: GRANTED called\n"); 218 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock); 219 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 220 return rpc_success; 221 } 222 223 /* 224 * This is the generic lockd callback for async RPC calls 225 */ 226 static void nlm4svc_callback_exit(struct rpc_task *task, void *data) 227 { 228 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 229 -task->tk_status); 230 } 231 232 static void nlm4svc_callback_release(void *data) 233 { 234 lock_kernel(); 235 nlm_release_call(data); 236 unlock_kernel(); 237 } 238 239 static const struct rpc_call_ops nlm4svc_callback_ops = { 240 .rpc_call_done = nlm4svc_callback_exit, 241 .rpc_release = nlm4svc_callback_release, 242 }; 243 244 /* 245 * `Async' versions of the above service routines. They aren't really, 246 * because we send the callback before the reply proper. I hope this 247 * doesn't break any clients. 248 */ 249 static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 250 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 251 { 252 struct nlm_host *host; 253 struct nlm_rqst *call; 254 __be32 stat; 255 256 host = nlmsvc_lookup_host(rqstp, 257 argp->lock.caller, 258 argp->lock.len); 259 if (host == NULL) 260 return rpc_system_err; 261 262 call = nlm_alloc_call(host); 263 if (call == NULL) 264 return rpc_system_err; 265 266 stat = func(rqstp, argp, &call->a_res); 267 if (stat != 0) { 268 nlm_release_call(call); 269 return stat; 270 } 271 272 call->a_flags = RPC_TASK_ASYNC; 273 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0) 274 return rpc_system_err; 275 return rpc_success; 276 } 277 278 static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 279 void *resp) 280 { 281 dprintk("lockd: TEST_MSG called\n"); 282 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test); 283 } 284 285 static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 286 void *resp) 287 { 288 dprintk("lockd: LOCK_MSG called\n"); 289 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock); 290 } 291 292 static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 293 void *resp) 294 { 295 dprintk("lockd: CANCEL_MSG called\n"); 296 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel); 297 } 298 299 static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 300 void *resp) 301 { 302 dprintk("lockd: UNLOCK_MSG called\n"); 303 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock); 304 } 305 306 static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 307 void *resp) 308 { 309 dprintk("lockd: GRANTED_MSG called\n"); 310 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted); 311 } 312 313 /* 314 * SHARE: create a DOS share or alter existing share. 315 */ 316 static __be32 317 nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 318 struct nlm_res *resp) 319 { 320 struct nlm_host *host; 321 struct nlm_file *file; 322 323 dprintk("lockd: SHARE called\n"); 324 325 resp->cookie = argp->cookie; 326 327 /* Don't accept new lock requests during grace period */ 328 if (locks_in_grace() && !argp->reclaim) { 329 resp->status = nlm_lck_denied_grace_period; 330 return rpc_success; 331 } 332 333 /* Obtain client and file */ 334 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 335 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 336 337 /* Now try to create the share */ 338 resp->status = nlmsvc_share_file(host, file, argp); 339 340 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 341 nlm_release_host(host); 342 nlm_release_file(file); 343 return rpc_success; 344 } 345 346 /* 347 * UNSHARE: Release a DOS share. 348 */ 349 static __be32 350 nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 351 struct nlm_res *resp) 352 { 353 struct nlm_host *host; 354 struct nlm_file *file; 355 356 dprintk("lockd: UNSHARE called\n"); 357 358 resp->cookie = argp->cookie; 359 360 /* Don't accept requests during grace period */ 361 if (locks_in_grace()) { 362 resp->status = nlm_lck_denied_grace_period; 363 return rpc_success; 364 } 365 366 /* Obtain client and file */ 367 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 368 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 369 370 /* Now try to lock the file */ 371 resp->status = nlmsvc_unshare_file(host, file, argp); 372 373 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 374 nlm_release_host(host); 375 nlm_release_file(file); 376 return rpc_success; 377 } 378 379 /* 380 * NM_LOCK: Create an unmonitored lock 381 */ 382 static __be32 383 nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 384 struct nlm_res *resp) 385 { 386 dprintk("lockd: NM_LOCK called\n"); 387 388 argp->monitor = 0; /* just clean the monitor flag */ 389 return nlm4svc_proc_lock(rqstp, argp, resp); 390 } 391 392 /* 393 * FREE_ALL: Release all locks and shares held by client 394 */ 395 static __be32 396 nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 397 void *resp) 398 { 399 struct nlm_host *host; 400 401 /* Obtain client */ 402 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL)) 403 return rpc_success; 404 405 nlmsvc_free_host_resources(host); 406 nlm_release_host(host); 407 return rpc_success; 408 } 409 410 /* 411 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 412 */ 413 static __be32 414 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 415 void *resp) 416 { 417 dprintk("lockd: SM_NOTIFY called\n"); 418 419 if (!nlm_privileged_requester(rqstp)) { 420 char buf[RPC_MAX_ADDRBUFLEN]; 421 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 422 svc_print_addr(rqstp, buf, sizeof(buf))); 423 return rpc_system_err; 424 } 425 426 nlm_host_rebooted(argp); 427 return rpc_success; 428 } 429 430 /* 431 * client sent a GRANTED_RES, let's remove the associated block 432 */ 433 static __be32 434 nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 435 void *resp) 436 { 437 if (!nlmsvc_ops) 438 return rpc_success; 439 440 dprintk("lockd: GRANTED_RES called\n"); 441 442 nlmsvc_grant_reply(&argp->cookie, argp->status); 443 return rpc_success; 444 } 445 446 447 /* 448 * NLM Server procedures. 449 */ 450 451 #define nlm4svc_encode_norep nlm4svc_encode_void 452 #define nlm4svc_decode_norep nlm4svc_decode_void 453 #define nlm4svc_decode_testres nlm4svc_decode_void 454 #define nlm4svc_decode_lockres nlm4svc_decode_void 455 #define nlm4svc_decode_unlockres nlm4svc_decode_void 456 #define nlm4svc_decode_cancelres nlm4svc_decode_void 457 #define nlm4svc_decode_grantedres nlm4svc_decode_void 458 459 #define nlm4svc_proc_none nlm4svc_proc_null 460 #define nlm4svc_proc_test_res nlm4svc_proc_null 461 #define nlm4svc_proc_lock_res nlm4svc_proc_null 462 #define nlm4svc_proc_cancel_res nlm4svc_proc_null 463 #define nlm4svc_proc_unlock_res nlm4svc_proc_null 464 465 struct nlm_void { int dummy; }; 466 467 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 468 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \ 469 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \ 470 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \ 471 .pc_release = NULL, \ 472 .pc_argsize = sizeof(struct nlm_##argt), \ 473 .pc_ressize = sizeof(struct nlm_##rest), \ 474 .pc_xdrressize = respsize, \ 475 } 476 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 477 #define No (1+1024/4) /* netobj */ 478 #define St 1 /* status */ 479 #define Rg 4 /* range (offset + length) */ 480 struct svc_procedure nlmsvc_procedures4[] = { 481 PROC(null, void, void, void, void, 1), 482 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 483 PROC(lock, lockargs, res, args, res, Ck+St), 484 PROC(cancel, cancargs, res, args, res, Ck+St), 485 PROC(unlock, unlockargs, res, args, res, Ck+St), 486 PROC(granted, testargs, res, args, res, Ck+St), 487 PROC(test_msg, testargs, norep, args, void, 1), 488 PROC(lock_msg, lockargs, norep, args, void, 1), 489 PROC(cancel_msg, cancargs, norep, args, void, 1), 490 PROC(unlock_msg, unlockargs, norep, args, void, 1), 491 PROC(granted_msg, testargs, norep, args, void, 1), 492 PROC(test_res, testres, norep, res, void, 1), 493 PROC(lock_res, lockres, norep, res, void, 1), 494 PROC(cancel_res, cancelres, norep, res, void, 1), 495 PROC(unlock_res, unlockres, norep, res, void, 1), 496 PROC(granted_res, res, norep, res, void, 1), 497 /* statd callback */ 498 PROC(sm_notify, reboot, void, reboot, void, 1), 499 PROC(none, void, void, void, void, 0), 500 PROC(none, void, void, void, void, 0), 501 PROC(none, void, void, void, void, 0), 502 PROC(share, shareargs, shareres, args, res, Ck+St+1), 503 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 504 PROC(nm_lock, lockargs, res, args, res, Ck+St), 505 PROC(free_all, notify, void, args, void, 1), 506 507 }; 508