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/smp_lock.h> 13#include <linux/lockd/lockd.h> 14#include <linux/lockd/share.h> 15 16#define NLMDBG_FACILITY NLMDBG_CLIENT 17 18#ifdef CONFIG_LOCKD_V4 19static __be32 20cast_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 */ 50static __be32 51nlmsvc_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 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) 72 goto no_locks; 73 *filp = file; 74 75 /* Set up the missing parts of the file_lock structure */ 76 lock->fl.fl_file = file->f_file; 77 lock->fl.fl_owner = (fl_owner_t) host; 78 lock->fl.fl_lmops = &nlmsvc_lock_operations; 79 } 80 81 return 0; 82 83no_locks: 84 nlm_release_host(host); 85 if (error) 86 return error; 87 return nlm_lck_denied_nolocks; 88} 89 90/* 91 * NULL: Test for presence of service 92 */ 93static __be32 94nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 95{ 96 dprintk("lockd: NULL called\n"); 97 return rpc_success; 98} 99 100/* 101 * TEST: Check for conflicting lock 102 */ 103static __be32 104nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, 105 struct nlm_res *resp) 106{ 107 struct nlm_host *host; 108 struct nlm_file *file; 109 __be32 rc = rpc_success; 110 111 dprintk("lockd: TEST called\n"); 112 resp->cookie = argp->cookie; 113 114 /* Obtain client and file */ 115 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 116 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 117 118 /* Now check for conflicting locks */ 119 resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie)); 120 if (resp->status == nlm_drop_reply) 121 rc = rpc_drop_reply; 122 else 123 dprintk("lockd: TEST status %d vers %d\n", 124 ntohl(resp->status), rqstp->rq_vers); 125 126 nlm_release_host(host); 127 nlm_release_file(file); 128 return rc; 129} 130 131static __be32 132nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 133 struct nlm_res *resp) 134{ 135 struct nlm_host *host; 136 struct nlm_file *file; 137 __be32 rc = rpc_success; 138 139 dprintk("lockd: LOCK called\n"); 140 141 resp->cookie = argp->cookie; 142 143 /* Obtain client and file */ 144 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 145 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 146 147 148 /* Now try to lock the file */ 149 resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock, 150 argp->block, &argp->cookie, 151 argp->reclaim)); 152 if (resp->status == nlm_drop_reply) 153 rc = rpc_drop_reply; 154 else 155 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 156 157 nlm_release_host(host); 158 nlm_release_file(file); 159 return rc; 160} 161 162static __be32 163nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 164 struct nlm_res *resp) 165{ 166 struct nlm_host *host; 167 struct nlm_file *file; 168 169 dprintk("lockd: CANCEL called\n"); 170 171 resp->cookie = argp->cookie; 172 173 /* Don't accept requests during grace period */ 174 if (locks_in_grace()) { 175 resp->status = nlm_lck_denied_grace_period; 176 return rpc_success; 177 } 178 179 /* Obtain client and file */ 180 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 181 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 182 183 /* Try to cancel request. */ 184 resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock)); 185 186 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 187 nlm_release_host(host); 188 nlm_release_file(file); 189 return rpc_success; 190} 191 192/* 193 * UNLOCK: release a lock 194 */ 195static __be32 196nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 197 struct nlm_res *resp) 198{ 199 struct nlm_host *host; 200 struct nlm_file *file; 201 202 dprintk("lockd: UNLOCK called\n"); 203 204 resp->cookie = argp->cookie; 205 206 /* Don't accept new lock requests during grace period */ 207 if (locks_in_grace()) { 208 resp->status = nlm_lck_denied_grace_period; 209 return rpc_success; 210 } 211 212 /* Obtain client and file */ 213 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 214 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 215 216 /* Now try to remove the lock */ 217 resp->status = cast_status(nlmsvc_unlock(file, &argp->lock)); 218 219 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 220 nlm_release_host(host); 221 nlm_release_file(file); 222 return rpc_success; 223} 224 225/* 226 * GRANTED: A server calls us to tell that a process' lock request 227 * was granted 228 */ 229static __be32 230nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 231 struct nlm_res *resp) 232{ 233 resp->cookie = argp->cookie; 234 235 dprintk("lockd: GRANTED called\n"); 236 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock); 237 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 238 return rpc_success; 239} 240 241/* 242 * This is the generic lockd callback for async RPC calls 243 */ 244static void nlmsvc_callback_exit(struct rpc_task *task, void *data) 245{ 246 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 247 -task->tk_status); 248} 249 250static void nlmsvc_callback_release(void *data) 251{ 252 lock_kernel(); 253 nlm_release_call(data); 254 unlock_kernel(); 255} 256 257static const struct rpc_call_ops nlmsvc_callback_ops = { 258 .rpc_call_done = nlmsvc_callback_exit, 259 .rpc_release = nlmsvc_callback_release, 260}; 261 262/* 263 * `Async' versions of the above service routines. They aren't really, 264 * because we send the callback before the reply proper. I hope this 265 * doesn't break any clients. 266 */ 267static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 268 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 269{ 270 struct nlm_host *host; 271 struct nlm_rqst *call; 272 __be32 stat; 273 274 host = nlmsvc_lookup_host(rqstp, 275 argp->lock.caller, 276 argp->lock.len); 277 if (host == NULL) 278 return rpc_system_err; 279 280 call = nlm_alloc_call(host); 281 if (call == NULL) 282 return rpc_system_err; 283 284 stat = func(rqstp, argp, &call->a_res); 285 if (stat != 0) { 286 nlm_release_call(call); 287 return stat; 288 } 289 290 call->a_flags = RPC_TASK_ASYNC; 291 if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0) 292 return rpc_system_err; 293 return rpc_success; 294} 295 296static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 297 void *resp) 298{ 299 dprintk("lockd: TEST_MSG called\n"); 300 return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test); 301} 302 303static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 304 void *resp) 305{ 306 dprintk("lockd: LOCK_MSG called\n"); 307 return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock); 308} 309 310static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 311 void *resp) 312{ 313 dprintk("lockd: CANCEL_MSG called\n"); 314 return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel); 315} 316 317static __be32 318nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 319 void *resp) 320{ 321 dprintk("lockd: UNLOCK_MSG called\n"); 322 return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock); 323} 324 325static __be32 326nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 327 void *resp) 328{ 329 dprintk("lockd: GRANTED_MSG called\n"); 330 return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted); 331} 332 333/* 334 * SHARE: create a DOS share or alter existing share. 335 */ 336static __be32 337nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 338 struct nlm_res *resp) 339{ 340 struct nlm_host *host; 341 struct nlm_file *file; 342 343 dprintk("lockd: SHARE called\n"); 344 345 resp->cookie = argp->cookie; 346 347 /* Don't accept new lock requests during grace period */ 348 if (locks_in_grace() && !argp->reclaim) { 349 resp->status = nlm_lck_denied_grace_period; 350 return rpc_success; 351 } 352 353 /* Obtain client and file */ 354 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 355 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 356 357 /* Now try to create the share */ 358 resp->status = cast_status(nlmsvc_share_file(host, file, argp)); 359 360 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 361 nlm_release_host(host); 362 nlm_release_file(file); 363 return rpc_success; 364} 365 366/* 367 * UNSHARE: Release a DOS share. 368 */ 369static __be32 370nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 371 struct nlm_res *resp) 372{ 373 struct nlm_host *host; 374 struct nlm_file *file; 375 376 dprintk("lockd: UNSHARE called\n"); 377 378 resp->cookie = argp->cookie; 379 380 /* Don't accept requests during grace period */ 381 if (locks_in_grace()) { 382 resp->status = nlm_lck_denied_grace_period; 383 return rpc_success; 384 } 385 386 /* Obtain client and file */ 387 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 388 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 389 390 /* Now try to unshare the file */ 391 resp->status = cast_status(nlmsvc_unshare_file(host, file, argp)); 392 393 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 394 nlm_release_host(host); 395 nlm_release_file(file); 396 return rpc_success; 397} 398 399/* 400 * NM_LOCK: Create an unmonitored lock 401 */ 402static __be32 403nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 404 struct nlm_res *resp) 405{ 406 dprintk("lockd: NM_LOCK called\n"); 407 408 argp->monitor = 0; /* just clean the monitor flag */ 409 return nlmsvc_proc_lock(rqstp, argp, resp); 410} 411 412/* 413 * FREE_ALL: Release all locks and shares held by client 414 */ 415static __be32 416nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 417 void *resp) 418{ 419 struct nlm_host *host; 420 421 /* Obtain client */ 422 if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL)) 423 return rpc_success; 424 425 nlmsvc_free_host_resources(host); 426 nlm_release_host(host); 427 return rpc_success; 428} 429 430/* 431 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 432 */ 433static __be32 434nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 435 void *resp) 436{ 437 dprintk("lockd: SM_NOTIFY called\n"); 438 439 if (!nlm_privileged_requester(rqstp)) { 440 char buf[RPC_MAX_ADDRBUFLEN]; 441 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 442 svc_print_addr(rqstp, buf, sizeof(buf))); 443 return rpc_system_err; 444 } 445 446 nlm_host_rebooted(argp); 447 return rpc_success; 448} 449 450/* 451 * client sent a GRANTED_RES, let's remove the associated block 452 */ 453static __be32 454nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 455 void *resp) 456{ 457 if (!nlmsvc_ops) 458 return rpc_success; 459 460 dprintk("lockd: GRANTED_RES called\n"); 461 462 nlmsvc_grant_reply(&argp->cookie, argp->status); 463 return rpc_success; 464} 465 466/* 467 * NLM Server procedures. 468 */ 469 470#define nlmsvc_encode_norep nlmsvc_encode_void 471#define nlmsvc_decode_norep nlmsvc_decode_void 472#define nlmsvc_decode_testres nlmsvc_decode_void 473#define nlmsvc_decode_lockres nlmsvc_decode_void 474#define nlmsvc_decode_unlockres nlmsvc_decode_void 475#define nlmsvc_decode_cancelres nlmsvc_decode_void 476#define nlmsvc_decode_grantedres nlmsvc_decode_void 477 478#define nlmsvc_proc_none nlmsvc_proc_null 479#define nlmsvc_proc_test_res nlmsvc_proc_null 480#define nlmsvc_proc_lock_res nlmsvc_proc_null 481#define nlmsvc_proc_cancel_res nlmsvc_proc_null 482#define nlmsvc_proc_unlock_res nlmsvc_proc_null 483 484struct nlm_void { int dummy; }; 485 486#define PROC(name, xargt, xrest, argt, rest, respsize) \ 487 { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \ 488 .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \ 489 .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \ 490 .pc_release = NULL, \ 491 .pc_argsize = sizeof(struct nlm_##argt), \ 492 .pc_ressize = sizeof(struct nlm_##rest), \ 493 .pc_xdrressize = respsize, \ 494 } 495 496#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 497#define St 1 /* status */ 498#define No (1+1024/4) /* Net Obj */ 499#define Rg 2 /* range - offset + size */ 500 501struct svc_procedure nlmsvc_procedures[] = { 502 PROC(null, void, void, void, void, 1), 503 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 504 PROC(lock, lockargs, res, args, res, Ck+St), 505 PROC(cancel, cancargs, res, args, res, Ck+St), 506 PROC(unlock, unlockargs, res, args, res, Ck+St), 507 PROC(granted, testargs, res, args, res, Ck+St), 508 PROC(test_msg, testargs, norep, args, void, 1), 509 PROC(lock_msg, lockargs, norep, args, void, 1), 510 PROC(cancel_msg, cancargs, norep, args, void, 1), 511 PROC(unlock_msg, unlockargs, norep, args, void, 1), 512 PROC(granted_msg, testargs, norep, args, void, 1), 513 PROC(test_res, testres, norep, res, void, 1), 514 PROC(lock_res, lockres, norep, res, void, 1), 515 PROC(cancel_res, cancelres, norep, res, void, 1), 516 PROC(unlock_res, unlockres, norep, res, void, 1), 517 PROC(granted_res, res, norep, res, void, 1), 518 /* statd callback */ 519 PROC(sm_notify, reboot, void, reboot, void, 1), 520 PROC(none, void, void, void, void, 1), 521 PROC(none, void, void, void, void, 1), 522 PROC(none, void, void, void, void, 1), 523 PROC(share, shareargs, shareres, args, res, Ck+St+1), 524 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 525 PROC(nm_lock, lockargs, res, args, res, Ck+St), 526 PROC(free_all, notify, void, args, void, 0), 527 528}; 529