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 #include <linux/sunrpc/svc_xprt.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 nlmsvc_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 nlmsvc_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 nlmsvc_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(SVC_NET(rqstp))) { 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(SVC_NET(rqstp), file, &argp->lock); 166 167 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 168 nlmsvc_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(SVC_NET(rqstp))) { 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(SVC_NET(rqstp), file, &argp->lock); 199 200 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 201 nlmsvc_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 nlmsvc_release_call(data); 234 } 235 236 static const struct rpc_call_ops nlm4svc_callback_ops = { 237 .rpc_call_done = nlm4svc_callback_exit, 238 .rpc_release = nlm4svc_callback_release, 239 }; 240 241 /* 242 * `Async' versions of the above service routines. They aren't really, 243 * because we send the callback before the reply proper. I hope this 244 * doesn't break any clients. 245 */ 246 static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 247 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 248 { 249 struct nlm_host *host; 250 struct nlm_rqst *call; 251 __be32 stat; 252 253 host = nlmsvc_lookup_host(rqstp, 254 argp->lock.caller, 255 argp->lock.len); 256 if (host == NULL) 257 return rpc_system_err; 258 259 call = nlm_alloc_call(host); 260 nlmsvc_release_host(host); 261 if (call == NULL) 262 return rpc_system_err; 263 264 stat = func(rqstp, argp, &call->a_res); 265 if (stat != 0) { 266 nlmsvc_release_call(call); 267 return stat; 268 } 269 270 call->a_flags = RPC_TASK_ASYNC; 271 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0) 272 return rpc_system_err; 273 return rpc_success; 274 } 275 276 static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 277 void *resp) 278 { 279 dprintk("lockd: TEST_MSG called\n"); 280 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test); 281 } 282 283 static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 284 void *resp) 285 { 286 dprintk("lockd: LOCK_MSG called\n"); 287 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock); 288 } 289 290 static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 291 void *resp) 292 { 293 dprintk("lockd: CANCEL_MSG called\n"); 294 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel); 295 } 296 297 static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 298 void *resp) 299 { 300 dprintk("lockd: UNLOCK_MSG called\n"); 301 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock); 302 } 303 304 static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 305 void *resp) 306 { 307 dprintk("lockd: GRANTED_MSG called\n"); 308 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted); 309 } 310 311 /* 312 * SHARE: create a DOS share or alter existing share. 313 */ 314 static __be32 315 nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 316 struct nlm_res *resp) 317 { 318 struct nlm_host *host; 319 struct nlm_file *file; 320 321 dprintk("lockd: SHARE called\n"); 322 323 resp->cookie = argp->cookie; 324 325 /* Don't accept new lock requests during grace period */ 326 if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) { 327 resp->status = nlm_lck_denied_grace_period; 328 return rpc_success; 329 } 330 331 /* Obtain client and file */ 332 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 333 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 334 335 /* Now try to create the share */ 336 resp->status = nlmsvc_share_file(host, file, argp); 337 338 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 339 nlmsvc_release_host(host); 340 nlm_release_file(file); 341 return rpc_success; 342 } 343 344 /* 345 * UNSHARE: Release a DOS share. 346 */ 347 static __be32 348 nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 349 struct nlm_res *resp) 350 { 351 struct nlm_host *host; 352 struct nlm_file *file; 353 354 dprintk("lockd: UNSHARE called\n"); 355 356 resp->cookie = argp->cookie; 357 358 /* Don't accept requests during grace period */ 359 if (locks_in_grace(SVC_NET(rqstp))) { 360 resp->status = nlm_lck_denied_grace_period; 361 return rpc_success; 362 } 363 364 /* Obtain client and file */ 365 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 366 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 367 368 /* Now try to lock the file */ 369 resp->status = nlmsvc_unshare_file(host, file, argp); 370 371 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 372 nlmsvc_release_host(host); 373 nlm_release_file(file); 374 return rpc_success; 375 } 376 377 /* 378 * NM_LOCK: Create an unmonitored lock 379 */ 380 static __be32 381 nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 382 struct nlm_res *resp) 383 { 384 dprintk("lockd: NM_LOCK called\n"); 385 386 argp->monitor = 0; /* just clean the monitor flag */ 387 return nlm4svc_proc_lock(rqstp, argp, resp); 388 } 389 390 /* 391 * FREE_ALL: Release all locks and shares held by client 392 */ 393 static __be32 394 nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 395 void *resp) 396 { 397 struct nlm_host *host; 398 399 /* Obtain client */ 400 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL)) 401 return rpc_success; 402 403 nlmsvc_free_host_resources(host); 404 nlmsvc_release_host(host); 405 return rpc_success; 406 } 407 408 /* 409 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 410 */ 411 static __be32 412 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 413 void *resp) 414 { 415 dprintk("lockd: SM_NOTIFY called\n"); 416 417 if (!nlm_privileged_requester(rqstp)) { 418 char buf[RPC_MAX_ADDRBUFLEN]; 419 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 420 svc_print_addr(rqstp, buf, sizeof(buf))); 421 return rpc_system_err; 422 } 423 424 nlm_host_rebooted(SVC_NET(rqstp), argp); 425 return rpc_success; 426 } 427 428 /* 429 * client sent a GRANTED_RES, let's remove the associated block 430 */ 431 static __be32 432 nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 433 void *resp) 434 { 435 if (!nlmsvc_ops) 436 return rpc_success; 437 438 dprintk("lockd: GRANTED_RES called\n"); 439 440 nlmsvc_grant_reply(&argp->cookie, argp->status); 441 return rpc_success; 442 } 443 444 445 /* 446 * NLM Server procedures. 447 */ 448 449 #define nlm4svc_encode_norep nlm4svc_encode_void 450 #define nlm4svc_decode_norep nlm4svc_decode_void 451 #define nlm4svc_decode_testres nlm4svc_decode_void 452 #define nlm4svc_decode_lockres nlm4svc_decode_void 453 #define nlm4svc_decode_unlockres nlm4svc_decode_void 454 #define nlm4svc_decode_cancelres nlm4svc_decode_void 455 #define nlm4svc_decode_grantedres nlm4svc_decode_void 456 457 #define nlm4svc_proc_none nlm4svc_proc_null 458 #define nlm4svc_proc_test_res nlm4svc_proc_null 459 #define nlm4svc_proc_lock_res nlm4svc_proc_null 460 #define nlm4svc_proc_cancel_res nlm4svc_proc_null 461 #define nlm4svc_proc_unlock_res nlm4svc_proc_null 462 463 struct nlm_void { int dummy; }; 464 465 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 466 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \ 467 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \ 468 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \ 469 .pc_release = NULL, \ 470 .pc_argsize = sizeof(struct nlm_##argt), \ 471 .pc_ressize = sizeof(struct nlm_##rest), \ 472 .pc_xdrressize = respsize, \ 473 } 474 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 475 #define No (1+1024/4) /* netobj */ 476 #define St 1 /* status */ 477 #define Rg 4 /* range (offset + length) */ 478 struct svc_procedure nlmsvc_procedures4[] = { 479 PROC(null, void, void, void, void, 1), 480 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 481 PROC(lock, lockargs, res, args, res, Ck+St), 482 PROC(cancel, cancargs, res, args, res, Ck+St), 483 PROC(unlock, unlockargs, res, args, res, Ck+St), 484 PROC(granted, testargs, res, args, res, Ck+St), 485 PROC(test_msg, testargs, norep, args, void, 1), 486 PROC(lock_msg, lockargs, norep, args, void, 1), 487 PROC(cancel_msg, cancargs, norep, args, void, 1), 488 PROC(unlock_msg, unlockargs, norep, args, void, 1), 489 PROC(granted_msg, testargs, norep, args, void, 1), 490 PROC(test_res, testres, norep, res, void, 1), 491 PROC(lock_res, lockres, norep, res, void, 1), 492 PROC(cancel_res, cancelres, norep, res, void, 1), 493 PROC(unlock_res, unlockres, norep, res, void, 1), 494 PROC(granted_res, res, norep, res, void, 1), 495 /* statd callback */ 496 PROC(sm_notify, reboot, void, reboot, void, 1), 497 PROC(none, void, void, void, void, 0), 498 PROC(none, void, void, void, void, 0), 499 PROC(none, void, void, void, void, 0), 500 PROC(share, shareargs, shareres, args, res, Ck+St+1), 501 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 502 PROC(nm_lock, lockargs, res, args, res, Ck+St), 503 PROC(free_all, notify, void, args, void, 1), 504 505 }; 506