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
  32 extern kmem_cache_t *ldlm_resource_slab;
  33 extern kmem_cache_t *ldlm_lock_slab;
  34 extern struct list_head ldlm_namespace_list;
  35 extern int (*mds_reint_p)(int offset, struct ptlrpc_request *req);
  36 extern int (*mds_getattr_name_p)(int offset, struct ptlrpc_request *req);
  37
  38 inline unsigned long round_timeout(unsigned long timeout)
  39 {
  40         return ((timeout / HZ) + 1) * HZ;
  41 }
  42
  43 static void waiting_locks_callback(unsigned long unused)
  44 {
  45         CERROR("lock(s) expired! need to start recovery!\n");
  46 }
  47
  48 static struct list_head waiting_locks_list;
  49 static spinlock_t waiting_locks_spinlock;
  50 static struct timer_list waiting_locks_timer;
  51 /*
  52  * Indicate that we're waiting for a client to call us back cancelling a given
  53  * lock.  We add it to the pending-callback chain, and schedule the lock-timeout
  54  * timer to fire appropriately.  (We round up to the next second, to avoid floods
  55  * of timer firings during periods of high lock contention and traffic.
  56  */
  57 int ldlm_add_waiting_lock(struct ldlm_lock *lock)
  58 {
  59         unsigned long timeout_rounded;
  60         ENTRY;
  61
  62         LASSERT(list_empty(&lock->l_pending_chain));
  63
  64         CERROR("waiting for lock %p\n", lock);
  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                 CERROR("adjusting timer! (%0lx/%0lx < %0lx)\n",
  73                        lock->l_callback_timeout, timeout_rounded,
  74                        waiting_locks_timer.expires);
  75                 mod_timer(&waiting_locks_timer, timeout_rounded);
  76         }
  77         list_add(&lock->l_pending_chain, waiting_locks_list.prev); /* FIFO */
  78         spin_unlock_bh(&waiting_locks_spinlock);
  79         RETURN(1);
  80 }
  81
  82 /*
  83  * Remove a lock from the pending list, likely because it had its cancellation
  84  * callback arrive without incident.  This adjusts the lock-timeout timer if
  85  * needed.  Returns 0 if the lock wasn't pending after all, 1 if it was.
  86  */
  87 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
  88 {
  89         struct list_head *list_next;
  90
  91         ENTRY;
  92
  93         spin_lock_bh(&waiting_locks_spinlock);
  94
  95         if (list_empty(&lock->l_pending_chain)) {
  96                 spin_unlock_bh(&waiting_locks_spinlock);
  97                 RETURN(0);
  98         }
  99
 100         CERROR("no longer waiting for lock %p\n", lock);
 101
 102         list_next = lock->l_pending_chain.next;
 103         if (lock->l_pending_chain.prev == &waiting_locks_list) {
 104                 /* Removing the head of the list, adjust timer. */
 105                 if (list_next == &waiting_locks_list) {
 106                         /* No more, just cancel. */
 107                         CERROR("no more locks waiting, stopping timer\n");
 108                         del_timer(&waiting_locks_timer);
 109                 } else {
 110                         struct ldlm_lock *next;
 111                         next = list_entry(list_next, struct ldlm_lock,
 112                                           l_pending_chain);
 113                         CERROR("adjusting timer (%0lx %0lx)\n",
 114                                waiting_locks_timer.expires,
 115                                round_timeout(next->l_callback_timeout));
 116                         mod_timer(&waiting_locks_timer,
 117                                   round_timeout(next->l_callback_timeout));
 118                 }
 119         }
 120         list_del_init(&lock->l_pending_chain);
 121         spin_unlock_bh(&waiting_locks_spinlock);
 122         RETURN(1);
 123 }
 124
 125 static int ldlm_server_blocking_ast(struct ldlm_lock *lock,
 126                                     struct ldlm_lock_desc *desc,
 127                                     void *data, __u32 data_len)
 128 {
 129         struct ldlm_request *body;
 130         struct ptlrpc_request *req;
 131         struct ptlrpc_client *cl;
 132         int rc = 0, size = sizeof(*body);
 133         ENTRY;
 134
 135         cl = &lock->l_resource->lr_namespace->ns_rpc_client;
 136         req = ptlrpc_prep_req(cl, lock->l_export->exp_connection,
 137                               LDLM_BL_CALLBACK, 1, &size, NULL);
 138         if (!req)
 139                 RETURN(-ENOMEM);
 140
 141         body = lustre_msg_buf(req->rq_reqmsg, 0);
 142         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 143                sizeof(body->lock_handle1));
 144         memcpy(&body->lock_desc, desc, sizeof(*desc));
 145
 146         LDLM_DEBUG(lock, "server preparing blocking AST");
 147         req->rq_replen = lustre_msg_size(0, NULL);
 148
 149         ldlm_add_waiting_lock(lock);
 150         rc = ptlrpc_queue_wait(req);
 151         rc = ptlrpc_check_status(req, rc);
 152         ptlrpc_free_req(req);
 153
 154         RETURN(rc);
 155 }
 156
 157 static int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags)
 158 {
 159         struct ldlm_request *body;
 160         struct ptlrpc_request *req;
 161         struct ptlrpc_client *cl;
 162         int rc = 0, size = sizeof(*body);
 163         ENTRY;
 164
 165         if (lock == NULL) {
 166                 LBUG();
 167                 RETURN(-EINVAL);
 168         }
 169
 170         cl = &lock->l_resource->lr_namespace->ns_rpc_client;
 171         req = ptlrpc_prep_req(cl, lock->l_export->exp_connection,
 172                               LDLM_CP_CALLBACK, 1, &size, NULL);
 173         if (!req)
 174                 RETURN(-ENOMEM);
 175
 176         body = lustre_msg_buf(req->rq_reqmsg, 0);
 177         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 178                sizeof(body->lock_handle1));
 179         body->lock_flags = flags;
 180         ldlm_lock2desc(lock, &body->lock_desc);
 181
 182         LDLM_DEBUG(lock, "server preparing completion AST");
 183         req->rq_replen = lustre_msg_size(0, NULL);
 184
 185         rc = ptlrpc_queue_wait(req);
 186         rc = ptlrpc_check_status(req, rc);
 187         ptlrpc_free_req(req);
 188         RETURN(rc);
 189 }
 190
 191 int ldlm_handle_enqueue(struct ptlrpc_request *req)
 192 {
 193         struct obd_device *obddev = req->rq_export->exp_obd;
 194         struct ldlm_reply *dlm_rep;
 195         struct ldlm_request *dlm_req;
 196         int rc, size = sizeof(*dlm_rep), cookielen = 0;
 197         __u32 flags;
 198         ldlm_error_t err;
 199         struct ldlm_lock *lock = NULL;
 200         void *cookie = NULL;
 201         ENTRY;
 202
 203         LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
 204
 205         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 206         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_MDSINTENT) {
 207                 /* In this case, the reply buffer is allocated deep in
 208                  * local_lock_enqueue by the policy function. */
 209                 cookie = req;
 210                 cookielen = sizeof(*req);
 211         } else {
 212                 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
 213                                      &req->rq_repmsg);
 214                 if (rc) {
 215                         CERROR("out of memory\n");
 216                         RETURN(-ENOMEM);
 217                 }
 218                 if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT) {
 219                         cookie = &dlm_req->lock_desc.l_extent;
 220                         cookielen = sizeof(struct ldlm_extent);
 221                 }
 222         }
 223
 224         lock = ldlm_lock_create(obddev->obd_namespace,
 225                                 &dlm_req->lock_handle2,
 226                                 dlm_req->lock_desc.l_resource.lr_name,
 227                                 dlm_req->lock_desc.l_resource.lr_type,
 228                                 dlm_req->lock_desc.l_req_mode, NULL, 0);
 229         if (!lock)
 230                 GOTO(out, err = -ENOMEM);
 231
 232         memcpy(&lock->l_remote_handle, &dlm_req->lock_handle1,
 233                sizeof(lock->l_remote_handle));
 234         LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
 235
 236         flags = dlm_req->lock_flags;
 237         err = ldlm_lock_enqueue(lock, cookie, cookielen, &flags,
 238                                 ldlm_server_completion_ast,
 239                                 ldlm_server_blocking_ast);
 240         if (err != ELDLM_OK)
 241                 GOTO(out, err);
 242
 243         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0);
 244         dlm_rep->lock_flags = flags;
 245
 246         ldlm_lock2handle(lock, &dlm_rep->lock_handle);
 247         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
 248                 memcpy(&dlm_rep->lock_extent, &lock->l_extent,
 249                        sizeof(lock->l_extent));
 250         if (dlm_rep->lock_flags & LDLM_FL_LOCK_CHANGED) {
 251                 memcpy(dlm_rep->lock_resource_name, lock->l_resource->lr_name,
 252                        sizeof(dlm_rep->lock_resource_name));
 253                 dlm_rep->lock_mode = lock->l_req_mode;
 254         }
 255
 256         lock->l_export = req->rq_export;
 257         ptlrpc_connection_addref(req->rq_connection);
 258         EXIT;
 259  out:
 260         if (lock)
 261                 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
 262                            "(err=%d)", err);
 263         req->rq_status = err;
 264
 265         if (ptlrpc_reply(req->rq_svc, req))
 266                 LBUG();
 267
 268         if (lock) {
 269                 if (!err)
 270                         ldlm_reprocess_all(lock->l_resource);
 271                 LDLM_LOCK_PUT(lock);
 272         }
 273         LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p)", lock);
 274
 275         return 0;
 276 }
 277
 278 int ldlm_handle_convert(struct ptlrpc_request *req)
 279 {
 280         struct ldlm_request *dlm_req;
 281         struct ldlm_reply *dlm_rep;
 282         struct ldlm_lock *lock;
 283         int rc, size = sizeof(*dlm_rep);
 284         ENTRY;
 285
 286         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 287         if (rc) {
 288                 CERROR("out of memory\n");
 289                 RETURN(-ENOMEM);
 290         }
 291         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 292         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0);
 293         dlm_rep->lock_flags = dlm_req->lock_flags;
 294
 295         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 296         if (!lock) {
 297                 req->rq_status = EINVAL;
 298         } else {
 299                 LDLM_DEBUG(lock, "server-side convert handler START");
 300                 ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
 301                                   &dlm_rep->lock_flags);
 302                 if (ldlm_del_waiting_lock(lock))
 303                         CDEBUG(D_DLMTRACE, "converted waiting lock %p\n", lock);
 304                 req->rq_status = 0;
 305         }
 306         if (ptlrpc_reply(req->rq_svc, req) != 0)
 307                 LBUG();
 308
 309         if (lock) {
 310                 ldlm_reprocess_all(lock->l_resource);
 311                 LDLM_DEBUG(lock, "server-side convert handler END");
 312                 LDLM_LOCK_PUT(lock);
 313         } else
 314                 LDLM_DEBUG_NOLOCK("server-side convert handler END");
 315
 316         RETURN(0);
 317 }
 318
 319 int ldlm_handle_cancel(struct ptlrpc_request *req)
 320 {
 321         struct ldlm_request *dlm_req;
 322         struct ldlm_lock *lock;
 323         int rc;
 324         ENTRY;
 325
 326         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 327         if (rc) {
 328                 CERROR("out of memory\n");
 329                 RETURN(-ENOMEM);
 330         }
 331         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 332
 333         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 334         if (!lock) {
 335                 LDLM_DEBUG_NOLOCK("server-side cancel handler stale lock (lock "
 336                                   "%p)", (void *)(unsigned long)
 337                                   dlm_req->lock_handle1.addr);
 338                 req->rq_status = ESTALE;
 339         } else {
 340                 LDLM_DEBUG(lock, "server-side cancel handler START");
 341                 ldlm_lock_cancel(lock);
 342                 if (ldlm_del_waiting_lock(lock))
 343                         CDEBUG(D_DLMTRACE, "cancelled waiting lock %p\n", lock);
 344                 req->rq_status = 0;
 345         }
 346
 347         if (ptlrpc_reply(req->rq_svc, req) != 0)
 348                 LBUG();
 349
 350         if (lock) {
 351                 ldlm_reprocess_all(lock->l_resource);
 352                 LDLM_DEBUG(lock, "server-side cancel handler END");
 353                 LDLM_LOCK_PUT(lock);
 354         }
 355
 356         RETURN(0);
 357 }
 358
 359 static int ldlm_handle_bl_callback(struct ptlrpc_request *req)
 360 {
 361         struct ldlm_request *dlm_req;
 362         struct ldlm_lock *lock;
 363         int rc, do_ast;
 364         ENTRY;
 365
 366         OBD_FAIL_RETURN(OBD_FAIL_OSC_LOCK_BL_REPLY, 0);
 367
 368         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 369         if (rc)
 370                 RETURN(-ENOMEM);
 371         rc = ptlrpc_reply(req->rq_svc, req);
 372         if (rc)
 373                 RETURN(rc);
 374
 375         OBD_FAIL_RETURN(OBD_FAIL_OSC_LOCK_BL_AST, 0);
 376
 377         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 378
 379         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 380         if (!lock) {
 381                 CERROR("blocking callback on lock %Lx - lock disappeared\n",
 382                        dlm_req->lock_handle1.addr);
 383                 RETURN(0);
 384         }
 385
 386         LDLM_DEBUG(lock, "client blocking AST callback handler START");
 387
 388         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 389         lock->l_flags |= LDLM_FL_CBPENDING;
 390         do_ast = (!lock->l_readers && !lock->l_writers);
 391         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 392
 393         if (do_ast) {
 394                 LDLM_DEBUG(lock, "already unused, calling "
 395                            "callback (%p)", lock->l_blocking_ast);
 396                 if (lock->l_blocking_ast != NULL) {
 397                         lock->l_blocking_ast(lock, &dlm_req->lock_desc,
 398                                              lock->l_data, lock->l_data_len);
 399                 }
 400         } else
 401                 LDLM_DEBUG(lock, "Lock still has references, will be"
 402                            " cancelled later");
 403
 404         LDLM_DEBUG(lock, "client blocking callback handler END");
 405         LDLM_LOCK_PUT(lock);
 406         RETURN(0);
 407 }
 408
 409 static int ldlm_handle_cp_callback(struct ptlrpc_request *req)
 410 {
 411         struct list_head ast_list = LIST_HEAD_INIT(ast_list);
 412         struct ldlm_request *dlm_req;
 413         struct ldlm_lock *lock;
 414         int rc;
 415         ENTRY;
 416
 417         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 418         if (rc)
 419                 RETURN(-ENOMEM);
 420         rc = ptlrpc_reply(req->rq_svc, req);
 421         if (rc)
 422                 RETURN(rc);
 423
 424         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 425
 426         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 427         if (!lock) {
 428                 CERROR("completion callback on lock %Lx - lock disappeared\n",
 429                        dlm_req->lock_handle1.addr);
 430                 RETURN(0);
 431         }
 432
 433         LDLM_DEBUG(lock, "client completion callback handler START");
 434
 435         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 436
 437         /* If we receive the completion AST before the actual enqueue returned,
 438          * then we might need to switch resources or lock modes. */
 439         if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
 440                 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
 441                 LDLM_DEBUG(lock, "completion AST, new lock mode");
 442         }
 443         ldlm_resource_unlink_lock(lock);
 444         if (memcmp(dlm_req->lock_desc.l_resource.lr_name,
 445                    lock->l_resource->lr_name,
 446                    sizeof(__u64) * RES_NAME_SIZE) != 0) {
 447                 ldlm_lock_change_resource(lock, dlm_req->lock_desc.l_resource.lr_name);
 448                 LDLM_DEBUG(lock, "completion AST, new resource");
 449         }
 450         lock->l_resource->lr_tmp = &ast_list;
 451         ldlm_grant_lock(lock);
 452         lock->l_resource->lr_tmp = NULL;
 453         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 454         LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
 455         LDLM_LOCK_PUT(lock);
 456
 457         ldlm_run_ast_work(&ast_list);
 458
 459         LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
 460                           lock);
 461         RETURN(0);
 462 }
 463
 464 static int ldlm_callback_handler(struct ptlrpc_request *req)
 465 {
 466         int rc;
 467         ENTRY;
 468
 469         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 470         if (rc) {
 471                 CERROR("lustre_ldlm: Invalid request\n");
 472                 GOTO(out, rc);
 473         }
 474
 475         if (req->rq_reqmsg->type != PTL_RPC_MSG_REQUEST) {
 476                 CERROR("lustre_ldlm: wrong packet type sent %d\n",
 477                        req->rq_reqmsg->type);
 478                 GOTO(out, rc = -EINVAL);
 479         }
 480         switch (req->rq_reqmsg->opc) {
 481         case LDLM_BL_CALLBACK:
 482                 CDEBUG(D_INODE, "blocking ast\n");
 483                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
 484                 rc = ldlm_handle_bl_callback(req);
 485                 break;
 486         case LDLM_CP_CALLBACK:
 487                 CDEBUG(D_INODE, "completion ast\n");
 488                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CP_CALLBACK, 0);
 489                 rc = ldlm_handle_cp_callback(req);
 490                 break;
 491
 492         default:
 493                 rc = ptlrpc_error(req->rq_svc, req);
 494                 RETURN(rc);
 495         }
 496
 497         EXIT;
 498 out:
 499         if (rc)
 500                 RETURN(ptlrpc_error(req->rq_svc, req));
 501         return 0;
 502 }
 503
 504
 505 static int ldlm_iocontrol(long cmd, struct lustre_handle *conn, int len,
 506                           void *karg, void *uarg)
 507 {
 508         struct obd_device *obddev = class_conn2obd(conn);
 509         struct ptlrpc_connection *connection;
 510         int err = 0;
 511         ENTRY;
 512
 513         if (_IOC_TYPE(cmd) != IOC_LDLM_TYPE || _IOC_NR(cmd) < IOC_LDLM_MIN_NR ||
 514             _IOC_NR(cmd) > IOC_LDLM_MAX_NR) {
 515                 CDEBUG(D_IOCTL, "invalid ioctl (type %ld, nr %ld, size %ld)\n",
 516                        _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
 517                 RETURN(-EINVAL);
 518         }
 519
 520         OBD_ALLOC(obddev->u.ldlm.ldlm_client,
 521                   sizeof(*obddev->u.ldlm.ldlm_client));
 522         ptlrpc_init_client(NULL, NULL,
 523                            LDLM_REQUEST_PORTAL, LDLM_REPLY_PORTAL,
 524                            obddev->u.ldlm.ldlm_client);
 525         connection = ptlrpc_uuid_to_connection("ldlm");
 526         if (!connection)
 527                 CERROR("No LDLM UUID found: assuming ldlm is local.\n");
 528
 529         switch (cmd) {
 530         case IOC_LDLM_TEST:
 531                 err = ldlm_test(obddev, conn);
 532                 CERROR("-- done err %d\n", err);
 533                 GOTO(out, err);
 534         case IOC_LDLM_DUMP:
 535                 ldlm_dump_all_namespaces();
 536                 GOTO(out, err);
 537         default:
 538                 GOTO(out, err = -EINVAL);
 539         }
 540
 541  out:
 542         if (connection)
 543                 ptlrpc_put_connection(connection);
 544         OBD_FREE(obddev->u.ldlm.ldlm_client,
 545                  sizeof(*obddev->u.ldlm.ldlm_client));
 546         return err;
 547 }
 548
 549 #define LDLM_NUM_THREADS        8
 550
 551 static int ldlm_setup(struct obd_device *obddev, obd_count len, void *buf)
 552 {
 553         struct ldlm_obd *ldlm = &obddev->u.ldlm;
 554         int rc, i;
 555         ENTRY;
 556
 557         MOD_INC_USE_COUNT;
 558         rc = ldlm_proc_setup(obddev);
 559         if (rc != 0)
 560                 GOTO(out_dec, rc);
 561
 562         ldlm->ldlm_service = ptlrpc_init_svc(64 * 1024, LDLM_REQUEST_PORTAL,
 563                                              LDLM_REPLY_PORTAL, "self",
 564                                              ldlm_callback_handler, "ldlm");
 565         if (!ldlm->ldlm_service)
 566                 GOTO(out_proc, rc = -ENOMEM);
 567
 568         for (i = 0; i < LDLM_NUM_THREADS; i++) {
 569                 char name[32];
 570                 sprintf(name, "lustre_dlm_%02d", i);
 571                 rc = ptlrpc_start_thread(obddev, ldlm->ldlm_service, name);
 572                 if (rc) {
 573                         CERROR("cannot start LDLM thread #%d: rc %d\n", i, rc);
 574                         LBUG();
 575                         GOTO(out_thread, rc);
 576                 }
 577         }
 578
 579         INIT_LIST_HEAD(&waiting_locks_list);
 580         spin_lock_init(&waiting_locks_spinlock);
 581         waiting_locks_timer.function = waiting_locks_callback;
 582         waiting_locks_timer.data = 0;
 583         init_timer(&waiting_locks_timer);
 584
 585         RETURN(0);
 586
 587  out_thread:
 588         ptlrpc_stop_all_threads(ldlm->ldlm_service);
 589         ptlrpc_unregister_service(ldlm->ldlm_service);
 590  out_proc:
 591         ldlm_proc_cleanup(obddev);
 592  out_dec:
 593         MOD_DEC_USE_COUNT;
 594         return rc;
 595 }
 596
 597 static int ldlm_cleanup(struct obd_device *obddev)
 598 {
 599         struct ldlm_obd *ldlm = &obddev->u.ldlm;
 600         ENTRY;
 601
 602         if (!list_empty(&ldlm_namespace_list)) {
 603                 CERROR("ldlm still has namespaces; clean these up first.\n");
 604                 RETURN(-EBUSY);
 605         }
 606
 607         ptlrpc_stop_all_threads(ldlm->ldlm_service);
 608         ptlrpc_unregister_service(ldlm->ldlm_service);
 609         ldlm_proc_cleanup(obddev);
 610
 611         MOD_DEC_USE_COUNT;
 612         RETURN(0);
 613 }
 614
 615 struct obd_ops ldlm_obd_ops = {
 616         o_iocontrol:   ldlm_iocontrol,
 617         o_setup:       ldlm_setup,
 618         o_cleanup:     ldlm_cleanup,
 619         o_connect:     class_connect,
 620         o_disconnect:  class_disconnect
 621 };
 622
 623 static int __init ldlm_init(void)
 624 {
 625         int rc = class_register_type(&ldlm_obd_ops, OBD_LDLM_DEVICENAME);
 626         if (rc != 0)
 627                 return rc;
 628
 629         ldlm_resource_slab = kmem_cache_create("ldlm_resources",
 630                                                sizeof(struct ldlm_resource), 0,
 631                                                SLAB_HWCACHE_ALIGN, NULL, NULL);
 632         if (ldlm_resource_slab == NULL)
 633                 return -ENOMEM;
 634
 635         ldlm_lock_slab = kmem_cache_create("ldlm_locks",
 636                                            sizeof(struct ldlm_lock), 0,
 637                                            SLAB_HWCACHE_ALIGN, NULL, NULL);
 638         if (ldlm_lock_slab == NULL) {
 639                 kmem_cache_destroy(ldlm_resource_slab);
 640                 return -ENOMEM;
 641         }
 642
 643         return 0;
 644 }
 645
 646 static void __exit ldlm_exit(void)
 647 {
 648         class_unregister_type(OBD_LDLM_DEVICENAME);
 649         if (kmem_cache_destroy(ldlm_resource_slab) != 0)
 650                 CERROR("couldn't free ldlm resource slab\n");
 651         if (kmem_cache_destroy(ldlm_lock_slab) != 0)
 652                 CERROR("couldn't free ldlm lock slab\n");
 653 }
 654
 655 EXPORT_SYMBOL(ldlm_completion_ast);
 656 EXPORT_SYMBOL(ldlm_handle_enqueue);
 657 EXPORT_SYMBOL(ldlm_handle_cancel);
 658 EXPORT_SYMBOL(ldlm_handle_convert);
 659 EXPORT_SYMBOL(ldlm_register_intent);
 660 EXPORT_SYMBOL(ldlm_unregister_intent);
 661 EXPORT_SYMBOL(ldlm_lockname);
 662 EXPORT_SYMBOL(ldlm_typename);
 663 EXPORT_SYMBOL(ldlm_handle2lock);
 664 EXPORT_SYMBOL(ldlm_lock2handle);
 665 EXPORT_SYMBOL(ldlm_lock_put);
 666 EXPORT_SYMBOL(ldlm_lock_match);
 667 EXPORT_SYMBOL(ldlm_lock_addref);
 668 EXPORT_SYMBOL(ldlm_lock_decref);
 669 EXPORT_SYMBOL(ldlm_lock_change_resource);
 670 EXPORT_SYMBOL(ldlm_cli_convert);
 671 EXPORT_SYMBOL(ldlm_cli_enqueue);
 672 EXPORT_SYMBOL(ldlm_cli_cancel);
 673 EXPORT_SYMBOL(ldlm_match_or_enqueue);
 674 EXPORT_SYMBOL(ldlm_it2str);
 675 EXPORT_SYMBOL(ldlm_test);
 676 EXPORT_SYMBOL(ldlm_regression_start);
 677 EXPORT_SYMBOL(ldlm_regression_stop);
 678 EXPORT_SYMBOL(ldlm_lock_dump);
 679 EXPORT_SYMBOL(ldlm_namespace_new);
 680 EXPORT_SYMBOL(ldlm_namespace_free);
 681 EXPORT_SYMBOL(l_lock);
 682 EXPORT_SYMBOL(l_unlock);
 683
 684 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 685 MODULE_DESCRIPTION("Lustre Lock Management Module v0.1");
 686 MODULE_LICENSE("GPL");
 687
 688 module_init(ldlm_init);
 689 module_exit(ldlm_exit);