lustre/ldlm/ldlm_lockd.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 2002 Cluster File Systems, Inc.
   5  *   Author: Peter Braam <braam@clusterfs.com>
   6  *   Author: Phil Schwan <phil@clusterfs.com>
   7  *
   8  *   This file is part of Lustre, http://www.lustre.org.
   9  *
  10  *   Lustre is free software; you can redistribute it and/or
  11  *   modify it under the terms of version 2 of the GNU General Public
  12  *   License as published by the Free Software Foundation.
  13  *
  14  *   Lustre is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with Lustre; if not, write to the Free Software
  21  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #define EXPORT_SYMTAB
  25 #define DEBUG_SUBSYSTEM S_LDLM
  26
  27 #include <linux/module.h>
  28 #include <linux/slab.h>
  29 #include <linux/lustre_dlm.h>
  30 #include <linux/init.h>
  31 #include <linux/obd_class.h>
  32
  33 extern kmem_cache_t *ldlm_resource_slab;
  34 extern kmem_cache_t *ldlm_lock_slab;
  35 extern struct list_head ldlm_namespace_list;
  36 extern int (*mds_reint_p)(int offset, struct ptlrpc_request *req);
  37 extern int (*mds_getattr_name_p)(int offset, struct ptlrpc_request *req);
  38
  39 inline unsigned long round_timeout(unsigned long timeout)
  40 {
  41         return ((timeout / HZ) + 1) * HZ;
  42 }
  43
  44 static void waiting_locks_callback(unsigned long unused)
  45 {
  46         CERROR("lock(s) expired! need to start recovery!\n");
  47 }
  48
  49 static struct list_head waiting_locks_list;
  50 static spinlock_t waiting_locks_spinlock;
  51 static struct timer_list waiting_locks_timer;
  52 /*
  53  * Indicate that we're waiting for a client to call us back cancelling a given
  54  * lock.  We add it to the pending-callback chain, and schedule the lock-timeout
  55  * timer to fire appropriately.  (We round up to the next second, to avoid
  56  * floods of timer firings during periods of high lock contention and traffic.
  57  */
  58 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
  59 {
  60         unsigned long timeout_rounded;
  61         ENTRY;
  62
  63         LASSERT(list_empty(&lock->l_pending_chain));
  64
  65         spin_lock_bh(&waiting_locks_spinlock);
  66         lock->l_callback_timeout = jiffies + (obd_timeout * HZ);
  67
  68         timeout_rounded = round_timeout(lock->l_callback_timeout);
  69
  70         if (timeout_rounded < waiting_locks_timer.expires ||
  71             !timer_pending(&waiting_locks_timer)) {
  72                 mod_timer(&waiting_locks_timer, timeout_rounded);
  73         }
  74         list_add_tail(&lock->l_pending_chain, &waiting_locks_list); /* FIFO */
  75         spin_unlock_bh(&waiting_locks_spinlock);
  76         RETURN(1);
  77 }
  78
  79 /*
  80  * Remove a lock from the pending list, likely because it had its cancellation
  81  * callback arrive without incident.  This adjusts the lock-timeout timer if
  82  * needed.  Returns 0 if the lock wasn't pending after all, 1 if it was.
  83  */
  84 static int ldlm_del_waiting_lock(struct ldlm_lock *lock)
  85 {
  86         struct list_head *list_next;
  87
  88         ENTRY;
  89
  90         spin_lock_bh(&waiting_locks_spinlock);
  91
  92         if (list_empty(&lock->l_pending_chain)) {
  93                 spin_unlock_bh(&waiting_locks_spinlock);
  94                 RETURN(0);
  95         }
  96
  97         list_next = lock->l_pending_chain.next;
  98         if (lock->l_pending_chain.prev == &waiting_locks_list) {
  99                 /* Removing the head of the list, adjust timer. */
 100                 if (list_next == &waiting_locks_list) {
 101                         /* No more, just cancel. */
 102                         del_timer(&waiting_locks_timer);
 103                 } else {
 104                         struct ldlm_lock *next;
 105                         next = list_entry(list_next, struct ldlm_lock,
 106                                           l_pending_chain);
 107                         mod_timer(&waiting_locks_timer,
 108                                   round_timeout(next->l_callback_timeout));
 109                 }
 110         }
 111         list_del_init(&lock->l_pending_chain);
 112         spin_unlock_bh(&waiting_locks_spinlock);
 113         RETURN(1);
 114 }
 115
 116 static int ldlm_server_blocking_ast(struct ldlm_lock *lock,
 117                                     struct ldlm_lock_desc *desc,
 118                                     void *data, __u32 data_len)
 119 {
 120         struct ldlm_request *body;
 121         struct ptlrpc_request *req;
 122         int rc = 0, size = sizeof(*body);
 123         ENTRY;
 124
 125         req = ptlrpc_prep_req(&lock->l_export->exp_ldlm_data.led_import,
 126                               LDLM_BL_CALLBACK, 1, &size, NULL);
 127         if (!req)
 128                 RETURN(-ENOMEM);
 129
 130         body = lustre_msg_buf(req->rq_reqmsg, 0);
 131         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 132                sizeof(body->lock_handle1));
 133         memcpy(&body->lock_desc, desc, sizeof(*desc));
 134
 135         LDLM_DEBUG(lock, "server preparing blocking AST");
 136         req->rq_replen = lustre_msg_size(0, NULL);
 137
 138         ldlm_add_waiting_lock(lock);
 139         rc = ptlrpc_queue_wait(req);
 140         rc = ptlrpc_check_status(req, rc);
 141         ptlrpc_free_req(req);
 142
 143         RETURN(rc);
 144 }
 145
 146 static int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags)
 147 {
 148         struct ldlm_request *body;
 149         struct ptlrpc_request *req;
 150         int rc = 0, size = sizeof(*body);
 151         ENTRY;
 152
 153         if (lock == NULL) {
 154                 LBUG();
 155                 RETURN(-EINVAL);
 156         }
 157
 158         req = ptlrpc_prep_req(&lock->l_export->exp_ldlm_data.led_import,
 159                               LDLM_CP_CALLBACK, 1, &size, NULL);
 160         if (!req)
 161                 RETURN(-ENOMEM);
 162
 163         body = lustre_msg_buf(req->rq_reqmsg, 0);
 164         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 165                sizeof(body->lock_handle1));
 166         body->lock_flags = flags;
 167         ldlm_lock2desc(lock, &body->lock_desc);
 168
 169         LDLM_DEBUG(lock, "server preparing completion AST");
 170         req->rq_replen = lustre_msg_size(0, NULL);
 171
 172         rc = ptlrpc_queue_wait(req);
 173         rc = ptlrpc_check_status(req, rc);
 174         ptlrpc_free_req(req);
 175         RETURN(rc);
 176 }
 177
 178 int ldlm_handle_enqueue(struct ptlrpc_request *req)
 179 {
 180         struct obd_device *obddev = req->rq_export->exp_obd;
 181         struct ldlm_reply *dlm_rep;
 182         struct ldlm_request *dlm_req;
 183         int rc, size = sizeof(*dlm_rep), cookielen = 0;
 184         __u32 flags;
 185         ldlm_error_t err;
 186         struct ldlm_lock *lock = NULL;
 187         void *cookie = NULL;
 188         ENTRY;
 189
 190         LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
 191
 192         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 193         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_MDSINTENT) {
 194                 /* In this case, the reply buffer is allocated deep in
 195                  * local_lock_enqueue by the policy function. */
 196                 cookie = req;
 197                 cookielen = sizeof(*req);
 198         } else {
 199                 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
 200                                      &req->rq_repmsg);
 201                 if (rc) {
 202                         CERROR("out of memory\n");
 203                         RETURN(-ENOMEM);
 204                 }
 205                 if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT) {
 206                         cookie = &dlm_req->lock_desc.l_extent;
 207                         cookielen = sizeof(struct ldlm_extent);
 208                 }
 209         }
 210
 211         lock = ldlm_lock_create(obddev->obd_namespace,
 212                                 &dlm_req->lock_handle2,
 213                                 dlm_req->lock_desc.l_resource.lr_name,
 214                                 dlm_req->lock_desc.l_resource.lr_type,
 215                                 dlm_req->lock_desc.l_req_mode, NULL, 0);
 216         if (!lock)
 217                 GOTO(out, err = -ENOMEM);
 218
 219         memcpy(&lock->l_remote_handle, &dlm_req->lock_handle1,
 220                sizeof(lock->l_remote_handle));
 221         LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
 222
 223         flags = dlm_req->lock_flags;
 224         err = ldlm_lock_enqueue(lock, cookie, cookielen, &flags,
 225                                 ldlm_server_completion_ast,
 226                                 ldlm_server_blocking_ast);
 227         if (err != ELDLM_OK)
 228                 GOTO(out, err);
 229
 230         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0);
 231         dlm_rep->lock_flags = flags;
 232
 233         ldlm_lock2handle(lock, &dlm_rep->lock_handle);
 234         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
 235                 memcpy(&dlm_rep->lock_extent, &lock->l_extent,
 236                        sizeof(lock->l_extent));
 237         if (dlm_rep->lock_flags & LDLM_FL_LOCK_CHANGED) {
 238                 memcpy(dlm_rep->lock_resource_name, lock->l_resource->lr_name,
 239                        sizeof(dlm_rep->lock_resource_name));
 240                 dlm_rep->lock_mode = lock->l_req_mode;
 241         }
 242
 243         lock->l_export = req->rq_export;
 244         if (lock->l_export) {
 245                 l_lock(&lock->l_resource->lr_namespace->ns_lock);
 246                 list_add(&lock->l_export_chain,
 247                          &lock->l_export->exp_ldlm_data.led_held_locks);
 248                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 249         }
 250
 251         ptlrpc_connection_addref(req->rq_connection);
 252         EXIT;
 253  out:
 254         if (lock)
 255                 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
 256                            "(err=%d)", err);
 257         req->rq_status = err;
 258
 259         if (ptlrpc_reply(req->rq_svc, req))
 260                 LBUG();
 261
 262         if (lock) {
 263                 if (!err)
 264                         ldlm_reprocess_all(lock->l_resource);
 265                 LDLM_LOCK_PUT(lock);
 266         }
 267         LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p)", lock);
 268
 269         return 0;
 270 }
 271
 272 int ldlm_handle_convert(struct ptlrpc_request *req)
 273 {
 274         struct ldlm_request *dlm_req;
 275         struct ldlm_reply *dlm_rep;
 276         struct ldlm_lock *lock;
 277         int rc, size = sizeof(*dlm_rep);
 278         ENTRY;
 279
 280         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 281         if (rc) {
 282                 CERROR("out of memory\n");
 283                 RETURN(-ENOMEM);
 284         }
 285         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 286         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0);
 287         dlm_rep->lock_flags = dlm_req->lock_flags;
 288
 289         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 290         if (!lock) {
 291                 req->rq_status = EINVAL;
 292         } else {
 293                 LDLM_DEBUG(lock, "server-side convert handler START");
 294                 ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
 295                                   &dlm_rep->lock_flags);
 296                 if (ldlm_del_waiting_lock(lock))
 297                         CDEBUG(D_DLMTRACE, "converted waiting lock %p\n", lock);
 298                 req->rq_status = 0;
 299         }
 300         if (ptlrpc_reply(req->rq_svc, req) != 0)
 301                 LBUG();
 302
 303         if (lock) {
 304                 ldlm_reprocess_all(lock->l_resource);
 305                 LDLM_DEBUG(lock, "server-side convert handler END");
 306                 LDLM_LOCK_PUT(lock);
 307         } else
 308                 LDLM_DEBUG_NOLOCK("server-side convert handler END");
 309
 310         RETURN(0);
 311 }
 312
 313 int ldlm_handle_cancel(struct ptlrpc_request *req)
 314 {
 315         struct ldlm_request *dlm_req;
 316         struct ldlm_lock *lock;
 317         int rc;
 318         ENTRY;
 319
 320         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 321         if (rc) {
 322                 CERROR("out of memory\n");
 323                 RETURN(-ENOMEM);
 324         }
 325         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 326
 327         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 328         if (!lock) {
 329                 LDLM_DEBUG_NOLOCK("server-side cancel handler stale lock (lock "
 330                                   "%p)", (void *)(unsigned long)
 331                                   dlm_req->lock_handle1.addr);
 332                 req->rq_status = ESTALE;
 333         } else {
 334                 LDLM_DEBUG(lock, "server-side cancel handler START");
 335                 ldlm_lock_cancel(lock);
 336                 if (ldlm_del_waiting_lock(lock))
 337                         CDEBUG(D_DLMTRACE, "cancelled waiting lock %p\n", lock);
 338                 req->rq_status = 0;
 339         }
 340
 341         if (ptlrpc_reply(req->rq_svc, req) != 0)
 342                 LBUG();
 343
 344         if (lock) {
 345                 ldlm_reprocess_all(lock->l_resource);
 346                 LDLM_DEBUG(lock, "server-side cancel handler END");
 347                 LDLM_LOCK_PUT(lock);
 348         }
 349
 350         RETURN(0);
 351 }
 352
 353 static int ldlm_handle_bl_callback(struct ptlrpc_request *req)
 354 {
 355         struct ldlm_request *dlm_req;
 356         struct ldlm_lock *lock;
 357         int rc, do_ast;
 358         ENTRY;
 359
 360         OBD_FAIL_RETURN(OBD_FAIL_OSC_LOCK_BL_REPLY, 0);
 361
 362         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 363         if (rc)
 364                 RETURN(-ENOMEM);
 365         rc = ptlrpc_reply(req->rq_svc, req);
 366         if (rc)
 367                 RETURN(rc);
 368
 369         OBD_FAIL_RETURN(OBD_FAIL_OSC_LOCK_BL_AST, 0);
 370
 371         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 372
 373         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 374         if (!lock) {
 375                 CERROR("blocking callback on lock %Lx - lock disappeared\n",
 376                        dlm_req->lock_handle1.addr);
 377                 RETURN(0);
 378         }
 379
 380         LDLM_DEBUG(lock, "client blocking AST callback handler START");
 381
 382         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 383         lock->l_flags |= LDLM_FL_CBPENDING;
 384         do_ast = (!lock->l_readers && !lock->l_writers);
 385         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 386
 387         if (do_ast) {
 388                 LDLM_DEBUG(lock, "already unused, calling "
 389                            "callback (%p)", lock->l_blocking_ast);
 390                 if (lock->l_blocking_ast != NULL) {
 391                         lock->l_blocking_ast(lock, &dlm_req->lock_desc,
 392                                              lock->l_data, lock->l_data_len);
 393                 }
 394         } else
 395                 LDLM_DEBUG(lock, "Lock still has references, will be"
 396                            " cancelled later");
 397
 398         LDLM_DEBUG(lock, "client blocking callback handler END");
 399         LDLM_LOCK_PUT(lock);
 400         RETURN(0);
 401 }
 402
 403 static int ldlm_handle_cp_callback(struct ptlrpc_request *req)
 404 {
 405         struct list_head ast_list = LIST_HEAD_INIT(ast_list);
 406         struct ldlm_request *dlm_req;
 407         struct ldlm_lock *lock;
 408         int rc;
 409         ENTRY;
 410
 411         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 412         if (rc)
 413                 RETURN(-ENOMEM);
 414         rc = ptlrpc_reply(req->rq_svc, req);
 415         if (rc)
 416                 RETURN(rc);
 417
 418         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 419
 420         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 421         if (!lock) {
 422                 CERROR("completion callback on lock %Lx - lock disappeared\n",
 423                        dlm_req->lock_handle1.addr);
 424                 RETURN(0);
 425         }
 426
 427         LDLM_DEBUG(lock, "client completion callback handler START");
 428
 429         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 430
 431         /* If we receive the completion AST before the actual enqueue returned,
 432          * then we might need to switch resources or lock modes. */
 433         if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
 434                 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
 435                 LDLM_DEBUG(lock, "completion AST, new lock mode");
 436         }
 437         ldlm_resource_unlink_lock(lock);
 438         if (memcmp(dlm_req->lock_desc.l_resource.lr_name,
 439                    lock->l_resource->lr_name,
 440                    sizeof(__u64) * RES_NAME_SIZE) != 0) {
 441                 ldlm_lock_change_resource(lock, dlm_req->lock_desc.l_resource.lr_name);
 442                 LDLM_DEBUG(lock, "completion AST, new resource");
 443         }
 444         lock->l_resource->lr_tmp = &ast_list;
 445         ldlm_grant_lock(lock);
 446         lock->l_resource->lr_tmp = NULL;
 447         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 448         LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
 449         LDLM_LOCK_PUT(lock);
 450
 451         ldlm_run_ast_work(&ast_list);
 452
 453         LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
 454                           lock);
 455         RETURN(0);
 456 }
 457
 458 static int ldlm_callback_handler(struct ptlrpc_request *req)
 459 {
 460         int rc;
 461         ENTRY;
 462
 463         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 464         if (rc) {
 465                 CERROR("lustre_ldlm: Invalid request\n");
 466                 GOTO(out, rc);
 467         }
 468
 469         switch (req->rq_reqmsg->opc) {
 470         case LDLM_BL_CALLBACK:
 471                 CDEBUG(D_INODE, "blocking ast\n");
 472                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
 473                 rc = ldlm_handle_bl_callback(req);
 474                 break;
 475         case LDLM_CP_CALLBACK:
 476                 CDEBUG(D_INODE, "completion ast\n");
 477                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CP_CALLBACK, 0);
 478                 rc = ldlm_handle_cp_callback(req);
 479                 break;
 480
 481         default:
 482                 rc = ptlrpc_error(req->rq_svc, req);
 483                 RETURN(rc);
 484         }
 485
 486         EXIT;
 487 out:
 488         if (rc)
 489                 RETURN(ptlrpc_error(req->rq_svc, req));
 490         return 0;
 491 }
 492
 493
 494 static int ldlm_iocontrol(long cmd, struct lustre_handle *conn, int len,
 495                           void *karg, void *uarg)
 496 {
 497         struct obd_device *obddev = class_conn2obd(conn);
 498         struct ptlrpc_connection *connection;
 499         int err = 0;
 500         ENTRY;
 501
 502         if (_IOC_TYPE(cmd) != IOC_LDLM_TYPE || _IOC_NR(cmd) < IOC_LDLM_MIN_NR ||
 503             _IOC_NR(cmd) > IOC_LDLM_MAX_NR) {
 504                 CDEBUG(D_IOCTL, "invalid ioctl (type %ld, nr %ld, size %ld)\n",
 505                        _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
 506                 RETURN(-EINVAL);
 507         }
 508
 509         OBD_ALLOC(obddev->u.ldlm.ldlm_client,
 510                   sizeof(*obddev->u.ldlm.ldlm_client));
 511         connection = ptlrpc_uuid_to_connection("ldlm");
 512         if (!connection)
 513                 CERROR("No LDLM UUID found: assuming ldlm is local.\n");
 514
 515         /* XXX
 516            ptlrpc_init_client(LDLM_REQUEST_PORTAL, LDLM_REPLY_PORTAL,
 517            obddev->u.ldlm.ldlm_client, connection);
 518         */
 519
 520         switch (cmd) {
 521         case IOC_LDLM_TEST:
 522                 err = ldlm_test(obddev, conn);
 523                 CERROR("-- done err %d\n", err);
 524                 GOTO(out, err);
 525         case IOC_LDLM_DUMP:
 526                 ldlm_dump_all_namespaces();
 527                 GOTO(out, err);
 528         default:
 529                 GOTO(out, err = -EINVAL);
 530         }
 531
 532  out:
 533         if (connection)
 534                 ptlrpc_put_connection(connection);
 535         OBD_FREE(obddev->u.ldlm.ldlm_client,
 536                  sizeof(*obddev->u.ldlm.ldlm_client));
 537         return err;
 538 }
 539
 540 #define LDLM_NUM_THREADS        8
 541
 542 static int ldlm_setup(struct obd_device *obddev, obd_count len, void *buf)
 543 {
 544         struct ldlm_obd *ldlm = &obddev->u.ldlm;
 545         int rc, i;
 546         ENTRY;
 547
 548         MOD_INC_USE_COUNT;
 549         /*
 550         rc = ldlm_proc_setup(obddev);
 551         if (rc != 0)
 552                 GOTO(out_dec, rc);
 553         */
 554         ldlm->ldlm_service = ptlrpc_init_svc(1024, 640, LDLM_REQUEST_PORTAL,
 555                                              LDLM_REPLY_PORTAL, "self",
 556                                              ldlm_callback_handler, "ldlm");
 557         if (!ldlm->ldlm_service)
 558                 GOTO(out_dec, rc = -ENOMEM);
 559
 560         for (i = 0; i < LDLM_NUM_THREADS; i++) {
 561                 char name[32];
 562                 sprintf(name, "lustre_dlm_%02d", i);
 563                 rc = ptlrpc_start_thread(obddev, ldlm->ldlm_service, name);
 564                 if (rc) {
 565                         CERROR("cannot start LDLM thread #%d: rc %d\n", i, rc);
 566                         LBUG();
 567                         GOTO(out_thread, rc);
 568                 }
 569         }
 570
 571         INIT_LIST_HEAD(&waiting_locks_list);
 572         spin_lock_init(&waiting_locks_spinlock);
 573         waiting_locks_timer.function = waiting_locks_callback;
 574         waiting_locks_timer.data = 0;
 575         init_timer(&waiting_locks_timer);
 576
 577         RETURN(0);
 578
 579  out_thread:
 580         ptlrpc_stop_all_threads(ldlm->ldlm_service);
 581         ptlrpc_unregister_service(ldlm->ldlm_service);
 582         /*
 583  out_proc:
 584
 585          ldlm_proc_cleanup(obddev);
 586         */
 587  out_dec:
 588         MOD_DEC_USE_COUNT;
 589         return rc;
 590 }
 591
 592 static int ldlm_cleanup(struct obd_device *obddev)
 593 {
 594         struct ldlm_obd *ldlm = &obddev->u.ldlm;
 595         ENTRY;
 596
 597         if (!list_empty(&ldlm_namespace_list)) {
 598                 CERROR("ldlm still has namespaces; clean these up first.\n");
 599                 RETURN(-EBUSY);
 600         }
 601
 602         ptlrpc_stop_all_threads(ldlm->ldlm_service);
 603         ptlrpc_unregister_service(ldlm->ldlm_service);
 604         /* ldlm_proc_cleanup(obddev); */
 605
 606         MOD_DEC_USE_COUNT;
 607         RETURN(0);
 608 }
 609
 610 struct obd_ops ldlm_obd_ops = {
 611         o_iocontrol:   ldlm_iocontrol,
 612         o_setup:       ldlm_setup,
 613         o_cleanup:     ldlm_cleanup,
 614         o_connect:     class_connect,
 615         o_disconnect:  class_disconnect
 616 };
 617
 618 static int __init ldlm_init(void)
 619 {
 620         int rc = class_register_type(&ldlm_obd_ops, OBD_LDLM_DEVICENAME);
 621         if (rc != 0)
 622                 return rc;
 623
 624         ldlm_resource_slab = kmem_cache_create("ldlm_resources",
 625                                                sizeof(struct ldlm_resource), 0,
 626                                                SLAB_HWCACHE_ALIGN, NULL, NULL);
 627         if (ldlm_resource_slab == NULL)
 628                 return -ENOMEM;
 629
 630         ldlm_lock_slab = kmem_cache_create("ldlm_locks",
 631                                            sizeof(struct ldlm_lock), 0,
 632                                            SLAB_HWCACHE_ALIGN, NULL, NULL);
 633         if (ldlm_lock_slab == NULL) {
 634                 kmem_cache_destroy(ldlm_resource_slab);
 635                 return -ENOMEM;
 636         }
 637
 638         return 0;
 639 }
 640
 641 static void __exit ldlm_exit(void)
 642 {
 643         class_unregister_type(OBD_LDLM_DEVICENAME);
 644         if (kmem_cache_destroy(ldlm_resource_slab) != 0)
 645                 CERROR("couldn't free ldlm resource slab\n");
 646         if (kmem_cache_destroy(ldlm_lock_slab) != 0)
 647                 CERROR("couldn't free ldlm lock slab\n");
 648 }
 649
 650 EXPORT_SYMBOL(ldlm_completion_ast);
 651 EXPORT_SYMBOL(ldlm_handle_enqueue);
 652 EXPORT_SYMBOL(ldlm_handle_cancel);
 653 EXPORT_SYMBOL(ldlm_handle_convert);
 654 EXPORT_SYMBOL(ldlm_register_intent);
 655 EXPORT_SYMBOL(ldlm_unregister_intent);
 656 EXPORT_SYMBOL(ldlm_lockname);
 657 EXPORT_SYMBOL(ldlm_typename);
 658 EXPORT_SYMBOL(ldlm_handle2lock);
 659 EXPORT_SYMBOL(ldlm_lock2handle);
 660 EXPORT_SYMBOL(ldlm_lock_put);
 661 EXPORT_SYMBOL(ldlm_lock_match);
 662 EXPORT_SYMBOL(ldlm_lock_addref);
 663 EXPORT_SYMBOL(ldlm_lock_decref);
 664 EXPORT_SYMBOL(ldlm_lock_change_resource);
 665 EXPORT_SYMBOL(ldlm_cli_convert);
 666 EXPORT_SYMBOL(ldlm_cli_enqueue);
 667 EXPORT_SYMBOL(ldlm_cli_cancel);
 668 EXPORT_SYMBOL(ldlm_match_or_enqueue);
 669 EXPORT_SYMBOL(ldlm_it2str);
 670 EXPORT_SYMBOL(ldlm_test);
 671 EXPORT_SYMBOL(ldlm_regression_start);
 672 EXPORT_SYMBOL(ldlm_regression_stop);
 673 EXPORT_SYMBOL(ldlm_lock_dump);
 674 EXPORT_SYMBOL(ldlm_namespace_new);
 675 EXPORT_SYMBOL(ldlm_namespace_free);
 676 EXPORT_SYMBOL(l_lock);
 677 EXPORT_SYMBOL(l_unlock);
 678
 679 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 680 MODULE_DESCRIPTION("Lustre Lock Management Module v0.1");
 681 MODULE_LICENSE("GPL");
 682
 683 module_init(ldlm_init);
 684 module_exit(ldlm_exit);