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 struct list_head waiting_locks_list;
  45 static spinlock_t waiting_locks_spinlock;
  46 static struct timer_list waiting_locks_timer;
  47
  48 static void waiting_locks_callback(unsigned long unused)
  49 {
  50         struct list_head *liter, *n;
  51
  52         spin_lock_bh(&waiting_locks_spinlock);
  53         list_for_each_safe(liter, n, &waiting_locks_list) {
  54                 struct ldlm_lock *l = list_entry(liter, struct ldlm_lock,
  55                                                  l_pending_chain);
  56                 if (l->l_callback_timeout > jiffies)
  57                         break;
  58                 LDLM_DEBUG(l, "timer expired, recovering conn %p\n",
  59                            l->l_export->exp_connection);
  60                 recovd_conn_fail(l->l_export->exp_connection);
  61         }
  62         spin_unlock_bh(&waiting_locks_spinlock);
  63 }
  64
  65 /*
  66  * Indicate that we're waiting for a client to call us back cancelling a given
  67  * lock.  We add it to the pending-callback chain, and schedule the lock-timeout
  68  * timer to fire appropriately.  (We round up to the next second, to avoid
  69  * floods of timer firings during periods of high lock contention and traffic).
  70  */
  71 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
  72 {
  73         unsigned long timeout_rounded;
  74         ENTRY;
  75
  76         LASSERT(list_empty(&lock->l_pending_chain));
  77
  78         spin_lock_bh(&waiting_locks_spinlock);
  79         lock->l_callback_timeout = jiffies + (obd_timeout * HZ);
  80
  81         timeout_rounded = round_timeout(lock->l_callback_timeout);
  82
  83         if (timeout_rounded < waiting_locks_timer.expires ||
  84             !timer_pending(&waiting_locks_timer)) {
  85                 mod_timer(&waiting_locks_timer, timeout_rounded);
  86         }
  87         list_add_tail(&lock->l_pending_chain, &waiting_locks_list); /* FIFO */
  88         spin_unlock_bh(&waiting_locks_spinlock);
  89         RETURN(1);
  90 }
  91
  92 /*
  93  * Remove a lock from the pending list, likely because it had its cancellation
  94  * callback arrive without incident.  This adjusts the lock-timeout timer if
  95  * needed.  Returns 0 if the lock wasn't pending after all, 1 if it was.
  96  */
  97 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
  98 {
  99         struct list_head *list_next;
 100
 101         ENTRY;
 102
 103         spin_lock_bh(&waiting_locks_spinlock);
 104
 105         if (list_empty(&lock->l_pending_chain)) {
 106                 spin_unlock_bh(&waiting_locks_spinlock);
 107                 RETURN(0);
 108         }
 109
 110         list_next = lock->l_pending_chain.next;
 111         if (lock->l_pending_chain.prev == &waiting_locks_list) {
 112                 /* Removing the head of the list, adjust timer. */
 113                 if (list_next == &waiting_locks_list) {
 114                         /* No more, just cancel. */
 115                         del_timer(&waiting_locks_timer);
 116                 } else {
 117                         struct ldlm_lock *next;
 118                         next = list_entry(list_next, struct ldlm_lock,
 119                                           l_pending_chain);
 120                         mod_timer(&waiting_locks_timer,
 121                                   round_timeout(next->l_callback_timeout));
 122                 }
 123         }
 124         list_del_init(&lock->l_pending_chain);
 125         spin_unlock_bh(&waiting_locks_spinlock);
 126         RETURN(1);
 127 }
 128
 129 static int ldlm_server_blocking_ast(struct ldlm_lock *lock,
 130                                     struct ldlm_lock_desc *desc,
 131                                     void *data, __u32 data_len, int flag)
 132 {
 133         struct ldlm_request *body;
 134         struct ptlrpc_request *req;
 135         int rc = 0, size = sizeof(*body);
 136         ENTRY;
 137
 138         if (flag == LDLM_CB_CANCELING) {
 139                 /* Don't need to do anything here. */
 140                 RETURN(0);
 141         }
 142
 143         req = ptlrpc_prep_req(&lock->l_export->exp_ldlm_data.led_import,
 144                               LDLM_BL_CALLBACK, 1, &size, NULL);
 145         if (!req)
 146                 RETURN(-ENOMEM);
 147
 148         body = lustre_msg_buf(req->rq_reqmsg, 0);
 149         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 150                sizeof(body->lock_handle1));
 151         memcpy(&body->lock_desc, desc, sizeof(*desc));
 152
 153         LDLM_DEBUG(lock, "server preparing blocking AST");
 154         req->rq_replen = 0; /* no reply needed */
 155
 156         ldlm_add_waiting_lock(lock);
 157         (void)ptl_send_rpc(req);
 158
 159         /* no commit, and no waiting for reply, so 2x decref now */
 160         ptlrpc_req_finished(req);
 161         ptlrpc_req_finished(req);
 162
 163         RETURN(rc);
 164 }
 165
 166 static int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags)
 167 {
 168         struct ldlm_request *body;
 169         struct ptlrpc_request *req;
 170         int rc = 0, size = sizeof(*body);
 171         ENTRY;
 172
 173         if (lock == NULL) {
 174                 LBUG();
 175                 RETURN(-EINVAL);
 176         }
 177
 178         req = ptlrpc_prep_req(&lock->l_export->exp_ldlm_data.led_import,
 179                               LDLM_CP_CALLBACK, 1, &size, NULL);
 180         if (!req)
 181                 RETURN(-ENOMEM);
 182
 183         body = lustre_msg_buf(req->rq_reqmsg, 0);
 184         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 185                sizeof(body->lock_handle1));
 186         body->lock_flags = flags;
 187         ldlm_lock2desc(lock, &body->lock_desc);
 188
 189         LDLM_DEBUG(lock, "server preparing completion AST");
 190         req->rq_replen = 0; /* no reply needed */
 191
 192         (void)ptl_send_rpc(req);
 193         /* no commit, and no waiting for reply, so 2x decref now */
 194         ptlrpc_req_finished(req);
 195         ptlrpc_req_finished(req);
 196
 197         RETURN(rc);
 198 }
 199
 200 int ldlm_handle_enqueue(struct ptlrpc_request *req)
 201 {
 202         struct obd_device *obddev = req->rq_export->exp_obd;
 203         struct ldlm_reply *dlm_rep;
 204         struct ldlm_request *dlm_req;
 205         int rc, size = sizeof(*dlm_rep), cookielen = 0;
 206         __u32 flags;
 207         ldlm_error_t err;
 208         struct ldlm_lock *lock = NULL;
 209         void *cookie = NULL;
 210         ENTRY;
 211
 212         LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
 213
 214         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 215         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_MDSINTENT) {
 216                 /* In this case, the reply buffer is allocated deep in
 217                  * local_lock_enqueue by the policy function. */
 218                 cookie = req;
 219                 cookielen = sizeof(*req);
 220         } else {
 221                 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
 222                                      &req->rq_repmsg);
 223                 if (rc) {
 224                         CERROR("out of memory\n");
 225                         RETURN(-ENOMEM);
 226                 }
 227                 if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT) {
 228                         cookie = &dlm_req->lock_desc.l_extent;
 229                         cookielen = sizeof(struct ldlm_extent);
 230                 }
 231         }
 232
 233         /* XXX notice that this lock has no callback data: of course the
 234            export would be exactly what we may want to use here... */
 235         lock = ldlm_lock_create(obddev->obd_namespace,
 236                                 &dlm_req->lock_handle2,
 237                                 dlm_req->lock_desc.l_resource.lr_name,
 238                                 dlm_req->lock_desc.l_resource.lr_type,
 239                                 dlm_req->lock_desc.l_req_mode, NULL, 0);
 240         if (!lock)
 241                 GOTO(out, err = -ENOMEM);
 242
 243         memcpy(&lock->l_remote_handle, &dlm_req->lock_handle1,
 244                sizeof(lock->l_remote_handle));
 245         LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
 246
 247         flags = dlm_req->lock_flags;
 248         err = ldlm_lock_enqueue(lock, cookie, cookielen, &flags,
 249                                 ldlm_server_completion_ast,
 250                                 ldlm_server_blocking_ast);
 251         if (err != ELDLM_OK)
 252                 GOTO(out, err);
 253
 254         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0);
 255         dlm_rep->lock_flags = flags;
 256
 257         ldlm_lock2handle(lock, &dlm_rep->lock_handle);
 258         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
 259                 memcpy(&dlm_rep->lock_extent, &lock->l_extent,
 260                        sizeof(lock->l_extent));
 261         if (dlm_rep->lock_flags & LDLM_FL_LOCK_CHANGED) {
 262                 memcpy(dlm_rep->lock_resource_name, lock->l_resource->lr_name,
 263                        sizeof(dlm_rep->lock_resource_name));
 264                 dlm_rep->lock_mode = lock->l_req_mode;
 265         }
 266
 267         lock->l_export = req->rq_export;
 268         if (lock->l_export) {
 269                 l_lock(&lock->l_resource->lr_namespace->ns_lock);
 270                 list_add(&lock->l_export_chain,
 271                          &lock->l_export->exp_ldlm_data.led_held_locks);
 272                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 273         }
 274
 275         ptlrpc_connection_addref(req->rq_connection);
 276         EXIT;
 277  out:
 278         if (lock)
 279                 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
 280                            "(err=%d)", err);
 281         req->rq_status = err;
 282
 283         if (ptlrpc_reply(req->rq_svc, req))
 284                 LBUG();
 285
 286         if (lock) {
 287                 if (!err)
 288                         ldlm_reprocess_all(lock->l_resource);
 289                 LDLM_LOCK_PUT(lock);
 290         }
 291         LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p)", lock);
 292
 293         return 0;
 294 }
 295
 296 int ldlm_handle_convert(struct ptlrpc_request *req)
 297 {
 298         struct ldlm_request *dlm_req;
 299         struct ldlm_reply *dlm_rep;
 300         struct ldlm_lock *lock;
 301         int rc, size = sizeof(*dlm_rep);
 302         ENTRY;
 303
 304         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 305         if (rc) {
 306                 CERROR("out of memory\n");
 307                 RETURN(-ENOMEM);
 308         }
 309         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 310         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0);
 311         dlm_rep->lock_flags = dlm_req->lock_flags;
 312
 313         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 314         if (!lock) {
 315                 req->rq_status = EINVAL;
 316         } else {
 317                 LDLM_DEBUG(lock, "server-side convert handler START");
 318                 ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
 319                                   &dlm_rep->lock_flags);
 320                 if (ldlm_del_waiting_lock(lock))
 321                         CDEBUG(D_DLMTRACE, "converted waiting lock %p\n", lock);
 322                 req->rq_status = 0;
 323         }
 324         if (ptlrpc_reply(req->rq_svc, req) != 0)
 325                 LBUG();
 326
 327         if (lock) {
 328                 ldlm_reprocess_all(lock->l_resource);
 329                 LDLM_DEBUG(lock, "server-side convert handler END");
 330                 LDLM_LOCK_PUT(lock);
 331         } else
 332                 LDLM_DEBUG_NOLOCK("server-side convert handler END");
 333
 334         RETURN(0);
 335 }
 336
 337 int ldlm_handle_cancel(struct ptlrpc_request *req)
 338 {
 339         struct ldlm_request *dlm_req;
 340         struct ldlm_lock *lock;
 341         int rc;
 342         ENTRY;
 343
 344         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 345         if (rc) {
 346                 CERROR("out of memory\n");
 347                 RETURN(-ENOMEM);
 348         }
 349         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 350
 351         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 352         if (!lock) {
 353                 LDLM_DEBUG_NOLOCK("server-side cancel handler stale lock (lock "
 354                                   "%p)", (void *)(unsigned long)
 355                                   dlm_req->lock_handle1.addr);
 356                 req->rq_status = ESTALE;
 357         } else {
 358                 LDLM_DEBUG(lock, "server-side cancel handler START");
 359                 ldlm_lock_cancel(lock);
 360                 if (ldlm_del_waiting_lock(lock))
 361                         CDEBUG(D_DLMTRACE, "cancelled waiting lock %p\n", lock);
 362                 req->rq_status = 0;
 363         }
 364
 365         if (ptlrpc_reply(req->rq_svc, req) != 0)
 366                 LBUG();
 367
 368         if (lock) {
 369                 ldlm_reprocess_all(lock->l_resource);
 370                 LDLM_DEBUG(lock, "server-side cancel handler END");
 371                 LDLM_LOCK_PUT(lock);
 372         }
 373
 374         RETURN(0);
 375 }
 376
 377 static int ldlm_handle_bl_callback(struct ptlrpc_request *req)
 378 {
 379         struct ldlm_request *dlm_req;
 380         struct ldlm_lock *lock;
 381         int do_ast;
 382         ENTRY;
 383
 384         OBD_FAIL_RETURN(OBD_FAIL_OSC_LOCK_BL_AST, 0);
 385
 386         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 387
 388         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 389         if (!lock) {
 390                 CERROR("blocking callback on lock "LPX64" - lock disappeared\n",
 391                        dlm_req->lock_handle1.addr);
 392                 RETURN(0);
 393         }
 394
 395         LDLM_DEBUG(lock, "client blocking AST callback handler START");
 396
 397         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 398         lock->l_flags |= LDLM_FL_CBPENDING;
 399         do_ast = (!lock->l_readers && !lock->l_writers);
 400         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 401
 402         if (do_ast) {
 403                 LDLM_DEBUG(lock, "already unused, calling "
 404                            "callback (%p)", lock->l_blocking_ast);
 405                 if (lock->l_blocking_ast != NULL) {
 406                         lock->l_blocking_ast(lock, &dlm_req->lock_desc,
 407                                              lock->l_data, lock->l_data_len,
 408                                              LDLM_CB_BLOCKING);
 409                 }
 410         } else
 411                 LDLM_DEBUG(lock, "Lock still has references, will be"
 412                            " cancelled later");
 413
 414         LDLM_DEBUG(lock, "client blocking callback handler END");
 415         LDLM_LOCK_PUT(lock);
 416         RETURN(0);
 417 }
 418
 419 static int ldlm_handle_cp_callback(struct ptlrpc_request *req)
 420 {
 421         struct list_head ast_list = LIST_HEAD_INIT(ast_list);
 422         struct ldlm_request *dlm_req;
 423         struct ldlm_lock *lock;
 424         ENTRY;
 425
 426         OBD_FAIL_RETURN(OBD_FAIL_OSC_LOCK_CP_AST, 0);
 427
 428         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 429
 430         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 431         if (!lock) {
 432                 CERROR("completion callback on lock "LPX64" - lock "
 433                        "disappeared\n", dlm_req->lock_handle1.addr);
 434                 RETURN(0);
 435         }
 436
 437         LDLM_DEBUG(lock, "client completion callback handler START");
 438
 439         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 440
 441         /* If we receive the completion AST before the actual enqueue returned,
 442          * then we might need to switch resources or lock modes. */
 443         if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
 444                 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
 445                 LDLM_DEBUG(lock, "completion AST, new lock mode");
 446         }
 447         ldlm_resource_unlink_lock(lock);
 448         if (memcmp(dlm_req->lock_desc.l_resource.lr_name,
 449                    lock->l_resource->lr_name,
 450                    sizeof(__u64) * RES_NAME_SIZE) != 0) {
 451                 ldlm_lock_change_resource(lock, dlm_req->lock_desc.l_resource.lr_name);
 452                 LDLM_DEBUG(lock, "completion AST, new resource");
 453         }
 454         lock->l_resource->lr_tmp = &ast_list;
 455         ldlm_grant_lock(lock);
 456         lock->l_resource->lr_tmp = NULL;
 457         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 458         LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
 459         LDLM_LOCK_PUT(lock);
 460
 461         ldlm_run_ast_work(&ast_list);
 462
 463         LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
 464                           lock);
 465         RETURN(0);
 466 }
 467
 468 static int ldlm_callback_handler(struct ptlrpc_request *req)
 469 {
 470         int rc;
 471         ENTRY;
 472
 473         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 474         if (rc) {
 475                 CERROR("lustre_ldlm: Invalid request: %d\n", rc);
 476                 RETURN(rc);
 477         }
 478
 479         if (req->rq_export == NULL) {
 480                 CERROR("lustre_dlm: operation %d with missing/invalid export\n",
 481                        req->rq_reqmsg->opc);
 482                 RETURN(-ENOTCONN);
 483         }
 484
 485         switch (req->rq_reqmsg->opc) {
 486         case LDLM_BL_CALLBACK:
 487                 CDEBUG(D_INODE, "blocking ast\n");
 488                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
 489                 rc = ldlm_handle_bl_callback(req);
 490                 RETURN(rc);
 491         case LDLM_CP_CALLBACK:
 492                 CDEBUG(D_INODE, "completion ast\n");
 493                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CP_CALLBACK, 0);
 494                 rc = ldlm_handle_cp_callback(req);
 495                 RETURN(rc);
 496         default:
 497                 CERROR("invalid opcode %d\n", req->rq_reqmsg->opc);
 498                 RETURN(-EINVAL);
 499         }
 500
 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         connection = ptlrpc_uuid_to_connection("ldlm");
 523         if (!connection)
 524                 CERROR("No LDLM UUID found: assuming ldlm is local.\n");
 525
 526         /* XXX
 527            ptlrpc_init_client(LDLM_REQUEST_PORTAL, LDLM_REPLY_PORTAL,
 528            obddev->u.ldlm.ldlm_client, connection);
 529         */
 530
 531         switch (cmd) {
 532         case IOC_LDLM_TEST:
 533                 err = ldlm_test(obddev, conn);
 534                 CERROR("-- done err %d\n", err);
 535                 GOTO(out, err);
 536         case IOC_LDLM_DUMP:
 537                 ldlm_dump_all_namespaces();
 538                 GOTO(out, err);
 539         default:
 540                 GOTO(out, err = -EINVAL);
 541         }
 542
 543  out:
 544         if (connection)
 545                 ptlrpc_put_connection(connection);
 546         OBD_FREE(obddev->u.ldlm.ldlm_client,
 547                  sizeof(*obddev->u.ldlm.ldlm_client));
 548         return err;
 549 }
 550
 551 #define LDLM_NUM_THREADS        8
 552
 553 static int ldlm_setup(struct obd_device *obddev, obd_count len, void *buf)
 554 {
 555         struct ldlm_obd *ldlm = &obddev->u.ldlm;
 556         int rc, i;
 557         ENTRY;
 558
 559         MOD_INC_USE_COUNT;
 560         /*
 561         rc = ldlm_proc_setup(obddev);
 562         if (rc != 0)
 563                 GOTO(out_dec, rc);
 564         */
 565         ldlm->ldlm_service =
 566                 ptlrpc_init_svc(LDLM_NEVENTS, LDLM_NBUFS, LDLM_BUFSIZE,
 567                                 LDLM_MAXREQSIZE, LDLM_REQUEST_PORTAL,
 568                                 LDLM_REPLY_PORTAL, "self",
 569                                 ldlm_callback_handler, "ldlm");
 570         if (!ldlm->ldlm_service)
 571                 GOTO(out_dec, rc = -ENOMEM);
 572
 573         for (i = 0; i < LDLM_NUM_THREADS; i++) {
 574                 char name[32];
 575                 sprintf(name, "lustre_dlm_%02d", i);
 576                 rc = ptlrpc_start_thread(obddev, ldlm->ldlm_service, name);
 577                 if (rc) {
 578                         CERROR("cannot start LDLM thread #%d: rc %d\n", i, rc);
 579                         LBUG();
 580                         GOTO(out_thread, rc);
 581                 }
 582         }
 583
 584         INIT_LIST_HEAD(&waiting_locks_list);
 585         spin_lock_init(&waiting_locks_spinlock);
 586         waiting_locks_timer.function = waiting_locks_callback;
 587         waiting_locks_timer.data = 0;
 588         init_timer(&waiting_locks_timer);
 589
 590         RETURN(0);
 591
 592  out_thread:
 593         ptlrpc_stop_all_threads(ldlm->ldlm_service);
 594         ptlrpc_unregister_service(ldlm->ldlm_service);
 595         /*
 596  out_proc:
 597
 598          ldlm_proc_cleanup(obddev);
 599         */
 600  out_dec:
 601         MOD_DEC_USE_COUNT;
 602         return rc;
 603 }
 604
 605 static int ldlm_cleanup(struct obd_device *obddev)
 606 {
 607         struct ldlm_obd *ldlm = &obddev->u.ldlm;
 608         ENTRY;
 609
 610         if (!list_empty(&ldlm_namespace_list)) {
 611                 CERROR("ldlm still has namespaces; clean these up first.\n");
 612                 RETURN(-EBUSY);
 613         }
 614
 615         ptlrpc_stop_all_threads(ldlm->ldlm_service);
 616         ptlrpc_unregister_service(ldlm->ldlm_service);
 617         /* ldlm_proc_cleanup(obddev); */
 618
 619         MOD_DEC_USE_COUNT;
 620         RETURN(0);
 621 }
 622
 623 struct obd_ops ldlm_obd_ops = {
 624         o_iocontrol:   ldlm_iocontrol,
 625         o_setup:       ldlm_setup,
 626         o_cleanup:     ldlm_cleanup,
 627         o_connect:     class_connect,
 628         o_disconnect:  class_disconnect
 629 };
 630
 631 static int __init ldlm_init(void)
 632 {
 633         int rc = class_register_type(&ldlm_obd_ops, OBD_LDLM_DEVICENAME);
 634         if (rc != 0)
 635                 return rc;
 636
 637         ldlm_resource_slab = kmem_cache_create("ldlm_resources",
 638                                                sizeof(struct ldlm_resource), 0,
 639                                                SLAB_HWCACHE_ALIGN, NULL, NULL);
 640         if (ldlm_resource_slab == NULL)
 641                 return -ENOMEM;
 642
 643         ldlm_lock_slab = kmem_cache_create("ldlm_locks",
 644                                            sizeof(struct ldlm_lock), 0,
 645                                            SLAB_HWCACHE_ALIGN, NULL, NULL);
 646         if (ldlm_lock_slab == NULL) {
 647                 kmem_cache_destroy(ldlm_resource_slab);
 648                 return -ENOMEM;
 649         }
 650
 651         return 0;
 652 }
 653
 654 static void __exit ldlm_exit(void)
 655 {
 656         class_unregister_type(OBD_LDLM_DEVICENAME);
 657         if (kmem_cache_destroy(ldlm_resource_slab) != 0)
 658                 CERROR("couldn't free ldlm resource slab\n");
 659         if (kmem_cache_destroy(ldlm_lock_slab) != 0)
 660                 CERROR("couldn't free ldlm lock slab\n");
 661 }
 662
 663 EXPORT_SYMBOL(ldlm_completion_ast);
 664 EXPORT_SYMBOL(ldlm_handle_enqueue);
 665 EXPORT_SYMBOL(ldlm_handle_cancel);
 666 EXPORT_SYMBOL(ldlm_handle_convert);
 667 EXPORT_SYMBOL(ldlm_register_intent);
 668 EXPORT_SYMBOL(ldlm_unregister_intent);
 669 EXPORT_SYMBOL(ldlm_lockname);
 670 EXPORT_SYMBOL(ldlm_typename);
 671 EXPORT_SYMBOL(ldlm_handle2lock);
 672 EXPORT_SYMBOL(ldlm_lock2handle);
 673 EXPORT_SYMBOL(ldlm_lock_put);
 674 EXPORT_SYMBOL(ldlm_lock_match);
 675 EXPORT_SYMBOL(ldlm_lock_addref);
 676 EXPORT_SYMBOL(ldlm_lock_decref);
 677 EXPORT_SYMBOL(ldlm_lock_change_resource);
 678 EXPORT_SYMBOL(ldlm_cli_convert);
 679 EXPORT_SYMBOL(ldlm_cli_enqueue);
 680 EXPORT_SYMBOL(ldlm_cli_cancel);
 681 EXPORT_SYMBOL(ldlm_cli_cancel_unused);
 682 EXPORT_SYMBOL(ldlm_match_or_enqueue);
 683 EXPORT_SYMBOL(ldlm_it2str);
 684 EXPORT_SYMBOL(ldlm_test);
 685 EXPORT_SYMBOL(ldlm_regression_start);
 686 EXPORT_SYMBOL(ldlm_regression_stop);
 687 EXPORT_SYMBOL(ldlm_lock_dump);
 688 EXPORT_SYMBOL(ldlm_namespace_new);
 689 EXPORT_SYMBOL(ldlm_namespace_free);
 690 EXPORT_SYMBOL(ldlm_cancel_locks_for_export);
 691 EXPORT_SYMBOL(l_lock);
 692 EXPORT_SYMBOL(l_unlock);
 693
 694 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 695 MODULE_DESCRIPTION("Lustre Lock Management Module v0.1");
 696 MODULE_LICENSE("GPL");
 697
 698 module_init(ldlm_init);
 699 module_exit(ldlm_exit);