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 static int ldlm_already_setup = 0;
  48
  49 static void waiting_locks_callback(unsigned long unused)
  50 {
  51         struct list_head *liter, *n;
  52
  53         spin_lock_bh(&waiting_locks_spinlock);
  54         list_for_each_safe(liter, n, &waiting_locks_list) {
  55                 struct ldlm_lock *l = list_entry(liter, struct ldlm_lock,
  56                                                  l_pending_chain);
  57                 if (l->l_callback_timeout > jiffies)
  58                         break;
  59                 LDLM_DEBUG(l, "timer expired, recovering exp %p on conn %p",
  60                            l->l_export, l->l_export->exp_connection);
  61                 recovd_conn_fail(l->l_export->exp_connection);
  62         }
  63         spin_unlock_bh(&waiting_locks_spinlock);
  64 }
  65
  66 /*
  67  * Indicate that we're waiting for a client to call us back cancelling a given
  68  * lock.  We add it to the pending-callback chain, and schedule the lock-timeout
  69  * timer to fire appropriately.  (We round up to the next second, to avoid
  70  * floods of timer firings during periods of high lock contention and traffic).
  71  */
  72 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
  73 {
  74         unsigned long timeout_rounded;
  75         ENTRY;
  76
  77         LASSERT(list_empty(&lock->l_pending_chain));
  78
  79         spin_lock_bh(&waiting_locks_spinlock);
  80         lock->l_callback_timeout = jiffies + (obd_timeout * HZ);
  81
  82         timeout_rounded = round_timeout(lock->l_callback_timeout);
  83
  84         if (timeout_rounded < waiting_locks_timer.expires ||
  85             !timer_pending(&waiting_locks_timer)) {
  86                 mod_timer(&waiting_locks_timer, timeout_rounded);
  87         }
  88         list_add_tail(&lock->l_pending_chain, &waiting_locks_list); /* FIFO */
  89         spin_unlock_bh(&waiting_locks_spinlock);
  90         RETURN(1);
  91 }
  92
  93 /*
  94  * Remove a lock from the pending list, likely because it had its cancellation
  95  * callback arrive without incident.  This adjusts the lock-timeout timer if
  96  * needed.  Returns 0 if the lock wasn't pending after all, 1 if it was.
  97  */
  98 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
  99 {
 100         struct list_head *list_next;
 101
 102         ENTRY;
 103
 104         spin_lock_bh(&waiting_locks_spinlock);
 105
 106         if (list_empty(&lock->l_pending_chain)) {
 107                 spin_unlock_bh(&waiting_locks_spinlock);
 108                 RETURN(0);
 109         }
 110
 111         list_next = lock->l_pending_chain.next;
 112         if (lock->l_pending_chain.prev == &waiting_locks_list) {
 113                 /* Removing the head of the list, adjust timer. */
 114                 if (list_next == &waiting_locks_list) {
 115                         /* No more, just cancel. */
 116                         del_timer(&waiting_locks_timer);
 117                 } else {
 118                         struct ldlm_lock *next;
 119                         next = list_entry(list_next, struct ldlm_lock,
 120                                           l_pending_chain);
 121                         mod_timer(&waiting_locks_timer,
 122                                   round_timeout(next->l_callback_timeout));
 123                 }
 124         }
 125         list_del_init(&lock->l_pending_chain);
 126         spin_unlock_bh(&waiting_locks_spinlock);
 127         RETURN(1);
 128 }
 129
 130 static int ldlm_server_blocking_ast(struct ldlm_lock *lock,
 131                                     struct ldlm_lock_desc *desc,
 132                                     void *data, __u32 data_len, int flag)
 133 {
 134         struct ldlm_request *body;
 135         struct ptlrpc_request *req;
 136         int rc = 0, size = sizeof(*body);
 137         ENTRY;
 138
 139         if (flag == LDLM_CB_CANCELING) {
 140                 /* Don't need to do anything here. */
 141                 RETURN(0);
 142         }
 143
 144         req = ptlrpc_prep_req(&lock->l_export->exp_ldlm_data.led_import,
 145                               LDLM_BL_CALLBACK, 1, &size, NULL);
 146         if (!req)
 147                 RETURN(-ENOMEM);
 148
 149         body = lustre_msg_buf(req->rq_reqmsg, 0);
 150         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 151                sizeof(body->lock_handle1));
 152         memcpy(&body->lock_desc, desc, sizeof(*desc));
 153
 154         LDLM_DEBUG(lock, "server preparing blocking AST");
 155         req->rq_replen = 0; /* no reply needed */
 156
 157         ldlm_add_waiting_lock(lock);
 158         (void)ptl_send_rpc(req);
 159
 160         /* no commit, and no waiting for reply, so 2x decref now */
 161         ptlrpc_req_finished(req);
 162         ptlrpc_req_finished(req);
 163
 164         RETURN(rc);
 165 }
 166
 167 static int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags)
 168 {
 169         struct ldlm_request *body;
 170         struct ptlrpc_request *req;
 171         int rc = 0, size = sizeof(*body);
 172         ENTRY;
 173
 174         if (lock == NULL) {
 175                 LBUG();
 176                 RETURN(-EINVAL);
 177         }
 178
 179         req = ptlrpc_prep_req(&lock->l_export->exp_ldlm_data.led_import,
 180                               LDLM_CP_CALLBACK, 1, &size, NULL);
 181         if (!req)
 182                 RETURN(-ENOMEM);
 183
 184         body = lustre_msg_buf(req->rq_reqmsg, 0);
 185         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 186                sizeof(body->lock_handle1));
 187         body->lock_flags = flags;
 188         ldlm_lock2desc(lock, &body->lock_desc);
 189
 190         LDLM_DEBUG(lock, "server preparing completion AST");
 191         req->rq_replen = 0; /* no reply needed */
 192
 193         (void)ptl_send_rpc(req);
 194         /* no commit, and no waiting for reply, so 2x decref now */
 195         ptlrpc_req_finished(req);
 196         ptlrpc_req_finished(req);
 197
 198         RETURN(rc);
 199 }
 200
 201 int ldlm_handle_enqueue(struct ptlrpc_request *req)
 202 {
 203         struct obd_device *obddev = req->rq_export->exp_obd;
 204         struct ldlm_reply *dlm_rep;
 205         struct ldlm_request *dlm_req;
 206         int rc, size = sizeof(*dlm_rep), cookielen = 0;
 207         __u32 flags;
 208         ldlm_error_t err;
 209         struct ldlm_lock *lock = NULL;
 210         void *cookie = NULL;
 211         ENTRY;
 212
 213         LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
 214
 215         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 216         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_MDSINTENT) {
 217                 /* In this case, the reply buffer is allocated deep in
 218                  * local_lock_enqueue by the policy function. */
 219                 cookie = req;
 220                 cookielen = sizeof(*req);
 221         } else {
 222                 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
 223                                      &req->rq_repmsg);
 224                 if (rc) {
 225                         CERROR("out of memory\n");
 226                         RETURN(-ENOMEM);
 227                 }
 228                 if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT) {
 229                         cookie = &dlm_req->lock_desc.l_extent;
 230                         cookielen = sizeof(struct ldlm_extent);
 231                 }
 232         }
 233
 234         /* XXX notice that this lock has no callback data: of course the
 235            export would be exactly what we may want to use here... */
 236         lock = ldlm_lock_create(obddev->obd_namespace,
 237                                 &dlm_req->lock_handle2,
 238                                 dlm_req->lock_desc.l_resource.lr_name,
 239                                 dlm_req->lock_desc.l_resource.lr_type,
 240                                 dlm_req->lock_desc.l_req_mode, NULL, 0);
 241         if (!lock)
 242                 GOTO(out, err = -ENOMEM);
 243
 244         memcpy(&lock->l_remote_handle, &dlm_req->lock_handle1,
 245                sizeof(lock->l_remote_handle));
 246         LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
 247
 248         flags = dlm_req->lock_flags;
 249         err = ldlm_lock_enqueue(lock, cookie, cookielen, &flags,
 250                                 ldlm_server_completion_ast,
 251                                 ldlm_server_blocking_ast);
 252         if (err != ELDLM_OK)
 253                 GOTO(out, err);
 254
 255         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0);
 256         dlm_rep->lock_flags = flags;
 257
 258         ldlm_lock2handle(lock, &dlm_rep->lock_handle);
 259         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
 260                 memcpy(&dlm_rep->lock_extent, &lock->l_extent,
 261                        sizeof(lock->l_extent));
 262         if (dlm_rep->lock_flags & LDLM_FL_LOCK_CHANGED) {
 263                 memcpy(dlm_rep->lock_resource_name, lock->l_resource->lr_name,
 264                        sizeof(dlm_rep->lock_resource_name));
 265                 dlm_rep->lock_mode = lock->l_req_mode;
 266         }
 267
 268         lock->l_export = req->rq_export;
 269         if (lock->l_export) {
 270                 l_lock(&lock->l_resource->lr_namespace->ns_lock);
 271                 list_add(&lock->l_export_chain,
 272                          &lock->l_export->exp_ldlm_data.led_held_locks);
 273                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 274         }
 275
 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         if (!dlm_req) {
 351                 CERROR("bad request buffer for cancel\n");
 352                 RETURN(-EINVAL);
 353         }
 354
 355         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 356         if (!lock) {
 357                 CERROR("bad lock handle\n");
 358                 LDLM_DEBUG_NOLOCK("server-side cancel handler stale lock (lock "
 359                                   "%p)", (void *)(unsigned long)
 360                                   dlm_req->lock_handle1.addr);
 361                 req->rq_status = ESTALE;
 362         } else {
 363                 LDLM_DEBUG(lock, "server-side cancel handler START");
 364                 ldlm_lock_cancel(lock);
 365                 if (ldlm_del_waiting_lock(lock))
 366                         CDEBUG(D_DLMTRACE, "cancelled waiting lock %p\n", lock);
 367                 req->rq_status = 0;
 368         }
 369
 370         if (ptlrpc_reply(req->rq_svc, req) != 0)
 371                 LBUG();
 372
 373         if (lock) {
 374                 ldlm_reprocess_all(lock->l_resource);
 375                 LDLM_DEBUG(lock, "server-side cancel handler END");
 376                 LDLM_LOCK_PUT(lock);
 377         }
 378
 379         RETURN(0);
 380 }
 381
 382 static int ldlm_handle_bl_callback(struct ptlrpc_request *req)
 383 {
 384         struct ldlm_request *dlm_req;
 385         struct ldlm_lock *lock;
 386         int do_ast;
 387         ENTRY;
 388
 389         OBD_FAIL_RETURN(OBD_FAIL_OSC_LOCK_BL_AST, 0);
 390
 391         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 392
 393         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 394         if (!lock) {
 395                 CERROR("blocking callback on lock "LPX64" - lock disappeared\n",
 396                        dlm_req->lock_handle1.addr);
 397                 RETURN(0);
 398         }
 399
 400         LDLM_DEBUG(lock, "client blocking AST callback handler START");
 401
 402         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 403         lock->l_flags |= LDLM_FL_CBPENDING;
 404         do_ast = (!lock->l_readers && !lock->l_writers);
 405         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 406
 407         if (do_ast) {
 408                 LDLM_DEBUG(lock, "already unused, calling "
 409                            "callback (%p)", lock->l_blocking_ast);
 410                 if (lock->l_blocking_ast != NULL) {
 411                         lock->l_blocking_ast(lock, &dlm_req->lock_desc,
 412                                              lock->l_data, lock->l_data_len,
 413                                              LDLM_CB_BLOCKING);
 414                 }
 415         } else
 416                 LDLM_DEBUG(lock, "Lock still has references, will be"
 417                            " cancelled later");
 418
 419         LDLM_DEBUG(lock, "client blocking callback handler END");
 420         LDLM_LOCK_PUT(lock);
 421         RETURN(0);
 422 }
 423
 424 static int ldlm_handle_cp_callback(struct ptlrpc_request *req)
 425 {
 426         struct list_head ast_list = LIST_HEAD_INIT(ast_list);
 427         struct ldlm_request *dlm_req;
 428         struct ldlm_lock *lock;
 429         ENTRY;
 430
 431         OBD_FAIL_RETURN(OBD_FAIL_OSC_LOCK_CP_AST, 0);
 432
 433         dlm_req = lustre_msg_buf(req->rq_reqmsg, 0);
 434
 435         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 436         if (!lock) {
 437                 CERROR("completion callback on lock "LPX64" - lock "
 438                        "disappeared\n", dlm_req->lock_handle1.addr);
 439                 RETURN(0);
 440         }
 441
 442         LDLM_DEBUG(lock, "client completion callback handler START");
 443
 444         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 445
 446         /* If we receive the completion AST before the actual enqueue returned,
 447          * then we might need to switch lock modes, resources, or extents. */
 448         if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
 449                 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
 450                 LDLM_DEBUG(lock, "completion AST, new lock mode");
 451         }
 452         if (lock->l_resource->lr_type == LDLM_EXTENT)
 453                 memcpy(&lock->l_extent, &dlm_req->lock_desc.l_extent,
 454                        sizeof(lock->l_extent));
 455         ldlm_resource_unlink_lock(lock);
 456         if (memcmp(dlm_req->lock_desc.l_resource.lr_name,
 457                    lock->l_resource->lr_name,
 458                    sizeof(__u64) * RES_NAME_SIZE) != 0) {
 459                 ldlm_lock_change_resource(lock, dlm_req->lock_desc.l_resource.lr_name);
 460                 LDLM_DEBUG(lock, "completion AST, new resource");
 461         }
 462         lock->l_resource->lr_tmp = &ast_list;
 463         ldlm_grant_lock(lock);
 464         lock->l_resource->lr_tmp = NULL;
 465         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 466         LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
 467         LDLM_LOCK_PUT(lock);
 468
 469         ldlm_run_ast_work(&ast_list);
 470
 471         LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
 472                           lock);
 473         RETURN(0);
 474 }
 475
 476 static int ldlm_callback_handler(struct ptlrpc_request *req)
 477 {
 478         int rc;
 479         ENTRY;
 480
 481         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 482         if (rc) {
 483                 CERROR("lustre_ldlm: Invalid request: %d\n", rc);
 484                 RETURN(rc);
 485         }
 486
 487         if (req->rq_export == NULL) {
 488                 CERROR("lustre_dlm: operation %d with missing/invalid export\n",
 489                        req->rq_reqmsg->opc);
 490                 RETURN(-ENOTCONN);
 491         }
 492
 493         switch (req->rq_reqmsg->opc) {
 494         case LDLM_BL_CALLBACK:
 495                 CDEBUG(D_INODE, "blocking ast\n");
 496                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
 497                 rc = ldlm_handle_bl_callback(req);
 498                 RETURN(rc);
 499         case LDLM_CP_CALLBACK:
 500                 CDEBUG(D_INODE, "completion ast\n");
 501                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CP_CALLBACK, 0);
 502                 rc = ldlm_handle_cp_callback(req);
 503                 RETURN(rc);
 504
 505         /* XXX FIXME move this back to mds/handler.c, bug 625069 */
 506         case LDLM_CANCEL:
 507                 CDEBUG(D_INODE, "cancel\n");
 508                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0);
 509                 rc = ldlm_handle_cancel(req);
 510                 if (rc)
 511                         break;
 512                 RETURN(0);
 513
 514         default:
 515                 CERROR("invalid opcode %d\n", req->rq_reqmsg->opc);
 516                 RETURN(-EINVAL);
 517         }
 518
 519         RETURN(0);
 520 }
 521
 522
 523 static int ldlm_iocontrol(long cmd, struct lustre_handle *conn, int len,
 524                           void *karg, void *uarg)
 525 {
 526         struct obd_device *obddev = class_conn2obd(conn);
 527         struct ptlrpc_connection *connection;
 528         int err = 0;
 529         ENTRY;
 530
 531         if (_IOC_TYPE(cmd) != IOC_LDLM_TYPE || _IOC_NR(cmd) < IOC_LDLM_MIN_NR ||
 532             _IOC_NR(cmd) > IOC_LDLM_MAX_NR) {
 533                 CDEBUG(D_IOCTL, "invalid ioctl (type %ld, nr %ld, size %ld)\n",
 534                        _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
 535                 RETURN(-EINVAL);
 536         }
 537
 538         OBD_ALLOC(obddev->u.ldlm.ldlm_client,
 539                   sizeof(*obddev->u.ldlm.ldlm_client));
 540         connection = ptlrpc_uuid_to_connection("ldlm");
 541         if (!connection)
 542                 CERROR("No LDLM UUID found: assuming ldlm is local.\n");
 543
 544         switch (cmd) {
 545         case IOC_LDLM_TEST:
 546                 err = ldlm_test(obddev, conn);
 547                 CERROR("-- done err %d\n", err);
 548                 GOTO(out, err);
 549         case IOC_LDLM_DUMP:
 550                 ldlm_dump_all_namespaces();
 551                 GOTO(out, err);
 552         default:
 553                 GOTO(out, err = -EINVAL);
 554         }
 555
 556  out:
 557         if (connection)
 558                 ptlrpc_put_connection(connection);
 559         OBD_FREE(obddev->u.ldlm.ldlm_client,
 560                  sizeof(*obddev->u.ldlm.ldlm_client));
 561         return err;
 562 }
 563
 564 #define LDLM_NUM_THREADS        8
 565
 566 static int ldlm_setup(struct obd_device *obddev, obd_count len, void *buf)
 567 {
 568         struct ldlm_obd *ldlm = &obddev->u.ldlm;
 569         int rc, i;
 570         ENTRY;
 571
 572         if (ldlm_already_setup)
 573                 RETURN(-EALREADY);
 574
 575         MOD_INC_USE_COUNT;
 576         /*
 577         rc = ldlm_proc_setup(obddev);
 578         if (rc != 0)
 579                 GOTO(out_dec, rc);
 580         */
 581         ldlm->ldlm_service =
 582                 ptlrpc_init_svc(LDLM_NEVENTS, LDLM_NBUFS, LDLM_BUFSIZE,
 583                                 LDLM_MAXREQSIZE, LDLM_REQUEST_PORTAL,
 584                                 LDLM_REPLY_PORTAL, "self",
 585                                 ldlm_callback_handler, "ldlm");
 586         if (!ldlm->ldlm_service)
 587                 GOTO(out_dec, rc = -ENOMEM);
 588
 589         for (i = 0; i < LDLM_NUM_THREADS; i++) {
 590                 char name[32];
 591                 sprintf(name, "lustre_dlm_%02d", i);
 592                 rc = ptlrpc_start_thread(obddev, ldlm->ldlm_service, name);
 593                 if (rc) {
 594                         CERROR("cannot start LDLM thread #%d: rc %d\n", i, rc);
 595                         LBUG();
 596                         GOTO(out_thread, rc);
 597                 }
 598         }
 599
 600         INIT_LIST_HEAD(&waiting_locks_list);
 601         spin_lock_init(&waiting_locks_spinlock);
 602         waiting_locks_timer.function = waiting_locks_callback;
 603         waiting_locks_timer.data = 0;
 604         init_timer(&waiting_locks_timer);
 605
 606         ldlm_already_setup = 1;
 607
 608         RETURN(0);
 609
 610  out_thread:
 611         ptlrpc_stop_all_threads(ldlm->ldlm_service);
 612         ptlrpc_unregister_service(ldlm->ldlm_service);
 613         /*
 614  out_proc:
 615
 616          ldlm_proc_cleanup(obddev);
 617         */
 618  out_dec:
 619         MOD_DEC_USE_COUNT;
 620         return rc;
 621 }
 622
 623 static int ldlm_cleanup(struct obd_device *obddev)
 624 {
 625         struct ldlm_obd *ldlm = &obddev->u.ldlm;
 626         ENTRY;
 627
 628         if (!list_empty(&ldlm_namespace_list)) {
 629                 CERROR("ldlm still has namespaces; clean these up first.\n");
 630                 RETURN(-EBUSY);
 631         }
 632
 633         ptlrpc_stop_all_threads(ldlm->ldlm_service);
 634         ptlrpc_unregister_service(ldlm->ldlm_service);
 635         /* ldlm_proc_cleanup(obddev); */
 636
 637         ldlm_already_setup = 0;
 638         MOD_DEC_USE_COUNT;
 639         RETURN(0);
 640 }
 641
 642 static int ldlm_connect(struct lustre_handle *conn, struct obd_device *src,
 643                         obd_uuid_t cluuid, struct recovd_obd *recovd,
 644                         ptlrpc_recovery_cb_t recover)
 645 {
 646         return class_connect(conn, src, cluuid);
 647 }
 648
 649 struct obd_ops ldlm_obd_ops = {
 650         o_iocontrol:   ldlm_iocontrol,
 651         o_setup:       ldlm_setup,
 652         o_cleanup:     ldlm_cleanup,
 653         o_connect:     ldlm_connect,
 654         o_disconnect:  class_disconnect
 655 };
 656
 657 static int __init ldlm_init(void)
 658 {
 659         int rc = class_register_type(&ldlm_obd_ops, OBD_LDLM_DEVICENAME);
 660         if (rc != 0)
 661                 return rc;
 662
 663         ldlm_resource_slab = kmem_cache_create("ldlm_resources",
 664                                                sizeof(struct ldlm_resource), 0,
 665                                                SLAB_HWCACHE_ALIGN, NULL, NULL);
 666         if (ldlm_resource_slab == NULL)
 667                 return -ENOMEM;
 668
 669         ldlm_lock_slab = kmem_cache_create("ldlm_locks",
 670                                            sizeof(struct ldlm_lock), 0,
 671                                            SLAB_HWCACHE_ALIGN, NULL, NULL);
 672         if (ldlm_lock_slab == NULL) {
 673                 kmem_cache_destroy(ldlm_resource_slab);
 674                 return -ENOMEM;
 675         }
 676
 677         return 0;
 678 }
 679
 680 static void __exit ldlm_exit(void)
 681 {
 682         class_unregister_type(OBD_LDLM_DEVICENAME);
 683         if (kmem_cache_destroy(ldlm_resource_slab) != 0)
 684                 CERROR("couldn't free ldlm resource slab\n");
 685         if (kmem_cache_destroy(ldlm_lock_slab) != 0)
 686                 CERROR("couldn't free ldlm lock slab\n");
 687 }
 688
 689 EXPORT_SYMBOL(ldlm_completion_ast);
 690 EXPORT_SYMBOL(ldlm_handle_enqueue);
 691 EXPORT_SYMBOL(ldlm_handle_cancel);
 692 EXPORT_SYMBOL(ldlm_handle_convert);
 693 EXPORT_SYMBOL(ldlm_register_intent);
 694 EXPORT_SYMBOL(ldlm_unregister_intent);
 695 EXPORT_SYMBOL(ldlm_lockname);
 696 EXPORT_SYMBOL(ldlm_typename);
 697 EXPORT_SYMBOL(ldlm_handle2lock);
 698 EXPORT_SYMBOL(ldlm_lock2handle);
 699 EXPORT_SYMBOL(ldlm_lock_put);
 700 EXPORT_SYMBOL(ldlm_lock_match);
 701 EXPORT_SYMBOL(ldlm_lock_addref);
 702 EXPORT_SYMBOL(ldlm_lock_decref);
 703 EXPORT_SYMBOL(ldlm_lock_change_resource);
 704 EXPORT_SYMBOL(ldlm_cli_convert);
 705 EXPORT_SYMBOL(ldlm_cli_enqueue);
 706 EXPORT_SYMBOL(ldlm_cli_cancel);
 707 EXPORT_SYMBOL(ldlm_cli_cancel_unused);
 708 EXPORT_SYMBOL(ldlm_match_or_enqueue);
 709 EXPORT_SYMBOL(ldlm_it2str);
 710 EXPORT_SYMBOL(ldlm_test);
 711 EXPORT_SYMBOL(ldlm_regression_start);
 712 EXPORT_SYMBOL(ldlm_regression_stop);
 713 EXPORT_SYMBOL(ldlm_lock_dump);
 714 EXPORT_SYMBOL(ldlm_namespace_new);
 715 EXPORT_SYMBOL(ldlm_namespace_cleanup);
 716 EXPORT_SYMBOL(ldlm_namespace_free);
 717 EXPORT_SYMBOL(ldlm_namespace_dump);
 718 EXPORT_SYMBOL(ldlm_cancel_locks_for_export);
 719 EXPORT_SYMBOL(l_lock);
 720 EXPORT_SYMBOL(l_unlock);
 721
 722 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 723 MODULE_DESCRIPTION("Lustre Lock Management Module v0.1");
 724 MODULE_LICENSE("GPL");
 725
 726 module_init(ldlm_init);
 727 module_exit(ldlm_exit);