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 floods
  56  * of timer firings during periods of high lock contention and traffic.
  57  */
  58 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         CERROR("waiting for lock %p\n", lock);
  66         spin_lock_bh(&waiting_locks_spinlock);
  67         lock->l_callback_timeout = jiffies + (obd_timeout * HZ);
  68
  69         timeout_rounded = round_timeout(lock->l_callback_timeout);
  70
  71         if (timeout_rounded < waiting_locks_timer.expires ||
  72             !timer_pending(&waiting_locks_timer)) {
  73                 CERROR("adjusting timer! (%0lx/%0lx < %0lx)\n",
  74                        lock->l_callback_timeout, timeout_rounded,
  75                        waiting_locks_timer.expires);
  76                 mod_timer(&waiting_locks_timer, timeout_rounded);
  77         }
  78         list_add_tail(&lock->l_pending_chain, &waiting_locks_list); /* FIFO */
  79         spin_unlock_bh(&waiting_locks_spinlock);
  80         RETURN(1);
  81 }
  82
  83 /*
  84  * Remove a lock from the pending list, likely because it had its cancellation
  85  * callback arrive without incident.  This adjusts the lock-timeout timer if
  86  * needed.  Returns 0 if the lock wasn't pending after all, 1 if it was.
  87  */
  88 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
  89 {
  90         struct list_head *list_next;
  91
  92         ENTRY;
  93
  94         spin_lock_bh(&waiting_locks_spinlock);
  95
  96         if (list_empty(&lock->l_pending_chain)) {
  97                 spin_unlock_bh(&waiting_locks_spinlock);
  98                 RETURN(0);
  99         }
 100
 101         CERROR("no longer waiting for lock %p\n", lock);
 102
 103         list_next = lock->l_pending_chain.next;
 104         if (lock->l_pending_chain.prev == &waiting_locks_list) {
 105                 /* Removing the head of the list, adjust timer. */
 106                 if (list_next == &waiting_locks_list) {
 107                         /* No more, just cancel. */
 108                         CERROR("no more locks waiting, stopping timer\n");
 109                         del_timer(&waiting_locks_timer);
 110                 } else {
 111                         struct ldlm_lock *next;
 112                         next = list_entry(list_next, struct ldlm_lock,
 113                                           l_pending_chain);
 114                         CERROR("adjusting timer (%0lx %0lx)\n",
 115                                waiting_locks_timer.expires,
 116                                round_timeout(next->l_callback_timeout));
 117                         mod_timer(&waiting_locks_timer,
 118                                   round_timeout(next->l_callback_timeout));
 119                 }
 120         }
 121         list_del_init(&lock->l_pending_chain);
 122         spin_unlock_bh(&waiting_locks_spinlock);
 123         RETURN(1);
 124 }
 125
 126 static int ldlm_server_blocking_ast(struct ldlm_lock *lock,
 127                                     struct ldlm_lock_desc *desc,
 128                                     void *data, __u32 data_len)
 129 {
 130         struct ldlm_request *body;
 131         struct ptlrpc_request *req;
 132         struct ptlrpc_client *cl;
 133         int rc = 0, size = sizeof(*body);
 134         ENTRY;
 135
 136         cl = &lock->l_resource->lr_namespace->ns_rpc_client;
 137         req = ptlrpc_prep_req(cl, lock->l_export->exp_connection,
 138                               LDLM_BL_CALLBACK, 1, &size, NULL);
 139         if (!req)
 140                 RETURN(-ENOMEM);
 141
 142         body = lustre_msg_buf(req->rq_reqmsg, 0);
 143         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 144                sizeof(body->lock_handle1));
 145         memcpy(&body->lock_desc, desc, sizeof(*desc));
 146
 147         LDLM_DEBUG(lock, "server preparing blocking AST");
 148         req->rq_replen = lustre_msg_size(0, NULL);
 149
 150         ldlm_add_waiting_lock(lock);
 151         rc = ptlrpc_queue_wait(req);
 152         rc = ptlrpc_check_status(req, rc);
 153         ptlrpc_free_req(req);
 154
 155         RETURN(rc);
 156 }
 157
 158 static int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags)
 159 {
 160         struct ldlm_request *body;
 161         struct ptlrpc_request *req;
 162         struct ptlrpc_client *cl;
 163         int rc = 0, size = sizeof(*body);
 164         ENTRY;
 165
 166         if (lock == NULL) {
 167                 LBUG();
 168                 RETURN(-EINVAL);
 169         }
 170
 171         cl = &lock->l_resource->lr_namespace->ns_rpc_client;
 172         req = ptlrpc_prep_req(cl, lock->l_export->exp_connection,
 173                               LDLM_CP_CALLBACK, 1, &size, NULL);
 174         if (!req)
 175                 RETURN(-ENOMEM);
 176
 177         body = lustre_msg_buf(req->rq_reqmsg, 0);
 178         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 179                sizeof(body->lock_handle1));
 180         body->lock_flags = flags;
 181         ldlm_lock2desc(lock, &body->lock_desc);
 182
 183         LDLM_DEBUG(lock, "server preparing completion AST");
 184         req->rq_replen = lustre_msg_size(0, NULL);
 185
 186         rc = ptlrpc_queue_wait(req);
 187         rc = ptlrpc_check_status(req, rc);
 188         ptlrpc_free_req(req);
 189         RETURN(rc);
 190 }
 191
 192 int ldlm_handle_enqueue(struct ptlrpc_request *req)
 193 {
 194         struct obd_device *obddev = req->rq_export->exp_obd;
 195         struct ldlm_reply *dlm_rep;
 196         struct ldlm_request *dlm_req;
 197         int rc, size = sizeof(*dlm_rep), cookielen = 0;
 198         __u32 flags;
 199         ldlm_error_t err;
 200         struct ldlm_lock *lock = NULL;
 201         void *cookie = NULL;
 202         ENTRY;
 203
 204         LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
 205
 206         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 207         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_MDSINTENT) {
 208                 /* In this case, the reply buffer is allocated deep in
 209                  * local_lock_enqueue by the policy function. */
 210                 cookie = req;
 211                 cookielen = sizeof(*req);
 212         } else {
 213                 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
 214                                      &req->rq_repmsg);
 215                 if (rc) {
 216                         CERROR("out of memory\n");
 217                         RETURN(-ENOMEM);
 218                 }
 219                 if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT) {
 220                         cookie = &dlm_req->lock_desc.l_extent;
 221                         cookielen = sizeof(struct ldlm_extent);
 222                 }
 223         }
 224
 225         lock = ldlm_lock_create(obddev->obd_namespace,
 226                                 &dlm_req->lock_handle2,
 227                                 dlm_req->lock_desc.l_resource.lr_name,
 228                                 dlm_req->lock_desc.l_resource.lr_type,
 229                                 dlm_req->lock_desc.l_req_mode, NULL, 0);
 230         if (!lock)
 231                 GOTO(out, err = -ENOMEM);
 232
 233         memcpy(&lock->l_remote_handle, &dlm_req->lock_handle1,
 234                sizeof(lock->l_remote_handle));
 235         LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
 236
 237         flags = dlm_req->lock_flags;
 238         err = ldlm_lock_enqueue(lock, cookie, cookielen, &flags,
 239                                 ldlm_server_completion_ast,
 240                                 ldlm_server_blocking_ast);
 241         if (err != ELDLM_OK)
 242                 GOTO(out, err);
 243
 244         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0);
 245         dlm_rep->lock_flags = flags;
 246
 247         ldlm_lock2handle(lock, &dlm_rep->lock_handle);
 248         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
 249                 memcpy(&dlm_rep->lock_extent, &lock->l_extent,
 250                        sizeof(lock->l_extent));
 251         if (dlm_rep->lock_flags & LDLM_FL_LOCK_CHANGED) {
 252                 memcpy(dlm_rep->lock_resource_name, lock->l_resource->lr_name,
 253                        sizeof(dlm_rep->lock_resource_name));
 254                 dlm_rep->lock_mode = lock->l_req_mode;
 255         }
 256
 257         lock->l_export = req->rq_export;
 258         if (lock->l_export) {
 259                 l_lock(&lock->l_resource->lr_namespace->ns_lock);
 260                 list_add(&lock->l_export_chain,
 261                          &lock->l_export->exp_ldlm_data.led_held_locks);
 262                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 263         }
 264
 265         ptlrpc_connection_addref(req->rq_connection);
 266         EXIT;
 267  out:
 268         if (lock)
 269                 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
 270                            "(err=%d)", err);
 271         req->rq_status = err;
 272
 273         if (ptlrpc_reply(req->rq_svc, req))
 274                 LBUG();
 275
 276         if (lock) {
 277                 if (!err)
 278                         ldlm_reprocess_all(lock->l_resource);
 279                 LDLM_LOCK_PUT(lock);
 280         }
 281         LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p)", lock);
 282
 283         return 0;
 284 }
 285
 286 int ldlm_handle_convert(struct ptlrpc_request *req)
 287 {
 288         struct ldlm_request *dlm_req;
 289         struct ldlm_reply *dlm_rep;
 290         struct ldlm_lock *lock;
 291         int rc, size = sizeof(*dlm_rep);
 292         ENTRY;
 293
 294         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 295         if (rc) {
 296                 CERROR("out of memory\n");
 297                 RETURN(-ENOMEM);
 298         }
 299         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 300         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0);
 301         dlm_rep->lock_flags = dlm_req->lock_flags;
 302
 303         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 304         if (!lock) {
 305                 req->rq_status = EINVAL;
 306         } else {
 307                 LDLM_DEBUG(lock, "server-side convert handler START");
 308                 ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
 309                                   &dlm_rep->lock_flags);
 310                 if (ldlm_del_waiting_lock(lock))
 311                         CDEBUG(D_DLMTRACE, "converted waiting lock %p\n", lock);
 312                 req->rq_status = 0;
 313         }
 314         if (ptlrpc_reply(req->rq_svc, req) != 0)
 315                 LBUG();
 316
 317         if (lock) {
 318                 ldlm_reprocess_all(lock->l_resource);
 319                 LDLM_DEBUG(lock, "server-side convert handler END");
 320                 LDLM_LOCK_PUT(lock);
 321         } else
 322                 LDLM_DEBUG_NOLOCK("server-side convert handler END");
 323
 324         RETURN(0);
 325 }
 326
 327 int ldlm_handle_cancel(struct ptlrpc_request *req)
 328 {
 329         struct ldlm_request *dlm_req;
 330         struct ldlm_lock *lock;
 331         int rc;
 332         ENTRY;
 333
 334         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 335         if (rc) {
 336                 CERROR("out of memory\n");
 337                 RETURN(-ENOMEM);
 338         }
 339         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 340
 341         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 342         if (!lock) {
 343                 LDLM_DEBUG_NOLOCK("server-side cancel handler stale lock (lock "
 344                                   "%p)", (void *)(unsigned long)
 345                                   dlm_req->lock_handle1.addr);
 346                 req->rq_status = ESTALE;
 347         } else {
 348                 LDLM_DEBUG(lock, "server-side cancel handler START");
 349                 ldlm_lock_cancel(lock);
 350                 if (ldlm_del_waiting_lock(lock))
 351                         CDEBUG(D_DLMTRACE, "cancelled waiting lock %p\n", lock);
 352                 req->rq_status = 0;
 353         }
 354
 355         if (ptlrpc_reply(req->rq_svc, req) != 0)
 356                 LBUG();
 357
 358         if (lock) {
 359                 ldlm_reprocess_all(lock->l_resource);
 360                 LDLM_DEBUG(lock, "server-side cancel handler END");
 361                 LDLM_LOCK_PUT(lock);
 362         }
 363
 364         RETURN(0);
 365 }
 366
 367 static int ldlm_handle_bl_callback(struct ptlrpc_request *req)
 368 {
 369         struct ldlm_request *dlm_req;
 370         struct ldlm_lock *lock;
 371         int rc, do_ast;
 372         ENTRY;
 373
 374         OBD_FAIL_RETURN(OBD_FAIL_OSC_LOCK_BL_REPLY, 0);
 375
 376         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 377         if (rc)
 378                 RETURN(-ENOMEM);
 379         rc = ptlrpc_reply(req->rq_svc, req);
 380         if (rc)
 381                 RETURN(rc);
 382
 383         OBD_FAIL_RETURN(OBD_FAIL_OSC_LOCK_BL_AST, 0);
 384
 385         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 386
 387         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 388         if (!lock) {
 389                 CERROR("blocking callback on lock %Lx - lock disappeared\n",
 390                        dlm_req->lock_handle1.addr);
 391                 RETURN(0);
 392         }
 393
 394         LDLM_DEBUG(lock, "client blocking AST callback handler START");
 395
 396         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 397         lock->l_flags |= LDLM_FL_CBPENDING;
 398         do_ast = (!lock->l_readers && !lock->l_writers);
 399         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 400
 401         if (do_ast) {
 402                 LDLM_DEBUG(lock, "already unused, calling "
 403                            "callback (%p)", lock->l_blocking_ast);
 404                 if (lock->l_blocking_ast != NULL) {
 405                         lock->l_blocking_ast(lock, &dlm_req->lock_desc,
 406                                              lock->l_data, lock->l_data_len);
 407                 }
 408         } else
 409                 LDLM_DEBUG(lock, "Lock still has references, will be"
 410                            " cancelled later");
 411
 412         LDLM_DEBUG(lock, "client blocking callback handler END");
 413         LDLM_LOCK_PUT(lock);
 414         RETURN(0);
 415 }
 416
 417 static int ldlm_handle_cp_callback(struct ptlrpc_request *req)
 418 {
 419         struct list_head ast_list = LIST_HEAD_INIT(ast_list);
 420         struct ldlm_request *dlm_req;
 421         struct ldlm_lock *lock;
 422         int rc;
 423         ENTRY;
 424
 425         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 426         if (rc)
 427                 RETURN(-ENOMEM);
 428         rc = ptlrpc_reply(req->rq_svc, req);
 429         if (rc)
 430                 RETURN(rc);
 431
 432         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 433
 434         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 435         if (!lock) {
 436                 CERROR("completion callback on lock %Lx - lock disappeared\n",
 437                        dlm_req->lock_handle1.addr);
 438                 RETURN(0);
 439         }
 440
 441         LDLM_DEBUG(lock, "client completion callback handler START");
 442
 443         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 444
 445         /* If we receive the completion AST before the actual enqueue returned,
 446          * then we might need to switch resources or lock modes. */
 447         if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
 448                 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
 449                 LDLM_DEBUG(lock, "completion AST, new lock mode");
 450         }
 451         ldlm_resource_unlink_lock(lock);
 452         if (memcmp(dlm_req->lock_desc.l_resource.lr_name,
 453                    lock->l_resource->lr_name,
 454                    sizeof(__u64) * RES_NAME_SIZE) != 0) {
 455                 ldlm_lock_change_resource(lock, dlm_req->lock_desc.l_resource.lr_name);
 456                 LDLM_DEBUG(lock, "completion AST, new resource");
 457         }
 458         lock->l_resource->lr_tmp = &ast_list;
 459         ldlm_grant_lock(lock);
 460         lock->l_resource->lr_tmp = NULL;
 461         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 462         LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
 463         LDLM_LOCK_PUT(lock);
 464
 465         ldlm_run_ast_work(&ast_list);
 466
 467         LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
 468                           lock);
 469         RETURN(0);
 470 }
 471
 472 static int ldlm_callback_handler(struct ptlrpc_request *req)
 473 {
 474         int rc;
 475         ENTRY;
 476
 477         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 478         if (rc) {
 479                 CERROR("lustre_ldlm: Invalid request\n");
 480                 GOTO(out, rc);
 481         }
 482
 483         if (req->rq_reqmsg->type != PTL_RPC_MSG_REQUEST) {
 484                 CERROR("lustre_ldlm: wrong packet type sent %d\n",
 485                        req->rq_reqmsg->type);
 486                 GOTO(out, rc = -EINVAL);
 487         }
 488         switch (req->rq_reqmsg->opc) {
 489         case LDLM_BL_CALLBACK:
 490                 CDEBUG(D_INODE, "blocking ast\n");
 491                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
 492                 rc = ldlm_handle_bl_callback(req);
 493                 break;
 494         case LDLM_CP_CALLBACK:
 495                 CDEBUG(D_INODE, "completion ast\n");
 496                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CP_CALLBACK, 0);
 497                 rc = ldlm_handle_cp_callback(req);
 498                 break;
 499
 500         default:
 501                 rc = ptlrpc_error(req->rq_svc, req);
 502                 RETURN(rc);
 503         }
 504
 505         EXIT;
 506 out:
 507         if (rc)
 508                 RETURN(ptlrpc_error(req->rq_svc, req));
 509         return 0;
 510 }
 511
 512
 513 static int ldlm_iocontrol(long cmd, struct lustre_handle *conn, int len,
 514                           void *karg, void *uarg)
 515 {
 516         struct obd_device *obddev = class_conn2obd(conn);
 517         struct ptlrpc_connection *connection;
 518         int err = 0;
 519         ENTRY;
 520
 521         if (_IOC_TYPE(cmd) != IOC_LDLM_TYPE || _IOC_NR(cmd) < IOC_LDLM_MIN_NR ||
 522             _IOC_NR(cmd) > IOC_LDLM_MAX_NR) {
 523                 CDEBUG(D_IOCTL, "invalid ioctl (type %ld, nr %ld, size %ld)\n",
 524                        _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
 525                 RETURN(-EINVAL);
 526         }
 527
 528         OBD_ALLOC(obddev->u.ldlm.ldlm_client,
 529                   sizeof(*obddev->u.ldlm.ldlm_client));
 530         ptlrpc_init_client(NULL, NULL,
 531                            LDLM_REQUEST_PORTAL, LDLM_REPLY_PORTAL,
 532                            obddev->u.ldlm.ldlm_client);
 533         connection = ptlrpc_uuid_to_connection("ldlm");
 534         if (!connection)
 535                 CERROR("No LDLM UUID found: assuming ldlm is local.\n");
 536
 537         switch (cmd) {
 538         case IOC_LDLM_TEST:
 539                 err = ldlm_test(obddev, conn);
 540                 CERROR("-- done err %d\n", err);
 541                 GOTO(out, err);
 542         case IOC_LDLM_DUMP:
 543                 ldlm_dump_all_namespaces();
 544                 GOTO(out, err);
 545         default:
 546                 GOTO(out, err = -EINVAL);
 547         }
 548
 549  out:
 550         if (connection)
 551                 ptlrpc_put_connection(connection);
 552         OBD_FREE(obddev->u.ldlm.ldlm_client,
 553                  sizeof(*obddev->u.ldlm.ldlm_client));
 554         return err;
 555 }
 556
 557 #define LDLM_NUM_THREADS        8
 558
 559 static int ldlm_setup(struct obd_device *obddev, obd_count len, void *buf)
 560 {
 561         struct ldlm_obd *ldlm = &obddev->u.ldlm;
 562         int rc, i;
 563         ENTRY;
 564
 565         MOD_INC_USE_COUNT;
 566         rc = ldlm_proc_setup(obddev);
 567         if (rc != 0)
 568                 GOTO(out_dec, rc);
 569
 570         ldlm->ldlm_service = ptlrpc_init_svc(64 * 1024, LDLM_REQUEST_PORTAL,
 571                                              LDLM_REPLY_PORTAL, "self",
 572                                              ldlm_callback_handler, "ldlm");
 573         if (!ldlm->ldlm_service)
 574                 GOTO(out_proc, rc = -ENOMEM);
 575
 576         for (i = 0; i < LDLM_NUM_THREADS; i++) {
 577                 char name[32];
 578                 sprintf(name, "lustre_dlm_%02d", i);
 579                 rc = ptlrpc_start_thread(obddev, ldlm->ldlm_service, name);
 580                 if (rc) {
 581                         CERROR("cannot start LDLM thread #%d: rc %d\n", i, rc);
 582                         LBUG();
 583                         GOTO(out_thread, rc);
 584                 }
 585         }
 586
 587         INIT_LIST_HEAD(&waiting_locks_list);
 588         spin_lock_init(&waiting_locks_spinlock);
 589         waiting_locks_timer.function = waiting_locks_callback;
 590         waiting_locks_timer.data = 0;
 591         init_timer(&waiting_locks_timer);
 592
 593         RETURN(0);
 594
 595  out_thread:
 596         ptlrpc_stop_all_threads(ldlm->ldlm_service);
 597         ptlrpc_unregister_service(ldlm->ldlm_service);
 598  out_proc:
 599         ldlm_proc_cleanup(obddev);
 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_match_or_enqueue);
 682 EXPORT_SYMBOL(ldlm_it2str);
 683 EXPORT_SYMBOL(ldlm_test);
 684 EXPORT_SYMBOL(ldlm_regression_start);
 685 EXPORT_SYMBOL(ldlm_regression_stop);
 686 EXPORT_SYMBOL(ldlm_lock_dump);
 687 EXPORT_SYMBOL(ldlm_namespace_new);
 688 EXPORT_SYMBOL(ldlm_namespace_free);
 689 EXPORT_SYMBOL(l_lock);
 690 EXPORT_SYMBOL(l_unlock);
 691
 692 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 693 MODULE_DESCRIPTION("Lustre Lock Management Module v0.1");
 694 MODULE_LICENSE("GPL");
 695
 696 module_init(ldlm_init);
 697 module_exit(ldlm_exit);