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) 2002-2004 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 the Lustre file system, http://www.lustre.org
   9  *   Lustre is a trademark of Cluster File Systems, Inc.
  10  *
  11  *   You may have signed or agreed to another license before downloading
  12  *   this software.  If so, you are bound by the terms and conditions
  13  *   of that agreement, and the following does not apply to you.  See the
  14  *   LICENSE file included with this distribution for more information.
  15  *
  16  *   If you did not agree to a different license, then this copy of Lustre
  17  *   is open source software; you can redistribute it and/or modify it
  18  *   under the terms of version 2 of the GNU General Public License as
  19  *   published by the Free Software Foundation.
  20  *
  21  *   In either case, Lustre is distributed in the hope that it will be
  22  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  23  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  *   license text for more details.
  25  */
  26
  27 #ifndef EXPORT_SYMTAB
  28 # define EXPORT_SYMTAB
  29 #endif
  30 #define DEBUG_SUBSYSTEM S_LDLM
  31
  32 #ifdef __KERNEL__
  33 # include <libcfs/libcfs.h>
  34 #else
  35 # include <liblustre.h>
  36 #endif
  37
  38 #include <lustre_dlm.h>
  39 #include <obd_class.h>
  40 #include <libcfs/list.h>
  41 #include "ldlm_internal.h"
  42
  43 #ifdef __KERNEL__
  44 static int ldlm_num_threads;
  45 CFS_MODULE_PARM(ldlm_num_threads, "i", int, 0444,
  46                 "number of DLM service threads to start");
  47 #endif
  48
  49 extern cfs_mem_cache_t *ldlm_resource_slab;
  50 extern cfs_mem_cache_t *ldlm_lock_slab;
  51 static struct semaphore ldlm_ref_sem;
  52 static int ldlm_refcount;
  53
  54 /* LDLM state */
  55
  56 static struct ldlm_state *ldlm_state;
  57
  58 inline cfs_time_t round_timeout(cfs_time_t timeout)
  59 {
  60         return cfs_time_seconds((int)cfs_duration_sec(cfs_time_sub(timeout, 0)) + 1);
  61 }
  62
  63 /* timeout for initial callback (AST) reply */
  64 static inline unsigned int ldlm_get_rq_timeout(unsigned int ldlm_timeout,
  65                                                unsigned int obd_timeout)
  66 {
  67         unsigned int timeout = min(ldlm_timeout, obd_timeout / 3);
  68
  69         return timeout < 1 ? 1 : timeout;
  70 }
  71
  72 #ifdef __KERNEL__
  73 /* w_l_spinlock protects both waiting_locks_list and expired_lock_thread */
  74 static spinlock_t waiting_locks_spinlock;   /* BH lock (timer) */
  75 static struct list_head waiting_locks_list;
  76 static cfs_timer_t waiting_locks_timer;
  77
  78 static struct expired_lock_thread {
  79         cfs_waitq_t               elt_waitq;
  80         int                       elt_state;
  81         int                       elt_dump;
  82         struct list_head          elt_expired_locks;
  83 } expired_lock_thread;
  84 #endif
  85
  86 #define ELT_STOPPED   0
  87 #define ELT_READY     1
  88 #define ELT_TERMINATE 2
  89
  90 struct ldlm_bl_pool {
  91         spinlock_t              blp_lock;
  92
  93         /*
  94          * blp_prio_list is used for callbacks that should be handled
  95          * as a priority. It is used for LDLM_FL_DISCARD_DATA requests.
  96          * see bug 13843
  97          */
  98         struct list_head        blp_prio_list;
  99
 100         /*
 101          * blp_list is used for all other callbacks which are likely
 102          * to take longer to process.
 103          */
 104         struct list_head        blp_list;
 105
 106         cfs_waitq_t             blp_waitq;
 107         struct completion       blp_comp;
 108         atomic_t                blp_num_threads;
 109         atomic_t                blp_busy_threads;
 110         int                     blp_min_threads;
 111         int                     blp_max_threads;
 112 };
 113
 114 struct ldlm_bl_work_item {
 115         struct list_head        blwi_entry;
 116         struct ldlm_namespace   *blwi_ns;
 117         struct ldlm_lock_desc   blwi_ld;
 118         struct ldlm_lock        *blwi_lock;
 119         struct list_head        blwi_head;
 120         int                     blwi_count;
 121 };
 122
 123 #ifdef __KERNEL__
 124
 125 static inline int have_expired_locks(void)
 126 {
 127         int need_to_run;
 128
 129         ENTRY;
 130         spin_lock_bh(&waiting_locks_spinlock);
 131         need_to_run = !list_empty(&expired_lock_thread.elt_expired_locks);
 132         spin_unlock_bh(&waiting_locks_spinlock);
 133
 134         RETURN(need_to_run);
 135 }
 136
 137 static int expired_lock_main(void *arg)
 138 {
 139         struct list_head *expired = &expired_lock_thread.elt_expired_locks;
 140         struct l_wait_info lwi = { 0 };
 141         int do_dump;
 142
 143         ENTRY;
 144         cfs_daemonize("ldlm_elt");
 145
 146         expired_lock_thread.elt_state = ELT_READY;
 147         cfs_waitq_signal(&expired_lock_thread.elt_waitq);
 148
 149         while (1) {
 150                 l_wait_event(expired_lock_thread.elt_waitq,
 151                              have_expired_locks() ||
 152                              expired_lock_thread.elt_state == ELT_TERMINATE,
 153                              &lwi);
 154
 155                 spin_lock_bh(&waiting_locks_spinlock);
 156                 if (expired_lock_thread.elt_dump) {
 157                         spin_unlock_bh(&waiting_locks_spinlock);
 158
 159                         /* from waiting_locks_callback, but not in timer */
 160                         libcfs_debug_dumplog();
 161                         libcfs_run_lbug_upcall(__FILE__,
 162                                                 "waiting_locks_callback",
 163                                                 expired_lock_thread.elt_dump);
 164
 165                         spin_lock_bh(&waiting_locks_spinlock);
 166                         expired_lock_thread.elt_dump = 0;
 167                 }
 168
 169                 do_dump = 0;
 170
 171                 while (!list_empty(expired)) {
 172                         struct obd_export *export;
 173                         struct ldlm_lock *lock;
 174
 175                         lock = list_entry(expired->next, struct ldlm_lock,
 176                                           l_pending_chain);
 177                         if ((void *)lock < LP_POISON + CFS_PAGE_SIZE &&
 178                             (void *)lock >= LP_POISON) {
 179                                 spin_unlock_bh(&waiting_locks_spinlock);
 180                                 CERROR("free lock on elt list %p\n", lock);
 181                                 LBUG();
 182                         }
 183                         list_del_init(&lock->l_pending_chain);
 184                         if ((void *)lock->l_export < LP_POISON + CFS_PAGE_SIZE &&
 185                             (void *)lock->l_export >= LP_POISON) {
 186                                 CERROR("lock with free export on elt list %p\n",
 187                                        lock->l_export);
 188                                 lock->l_export = NULL;
 189                                 LDLM_ERROR(lock, "free export");
 190                                 continue;
 191                         }
 192                         export = class_export_get(lock->l_export);
 193                         spin_unlock_bh(&waiting_locks_spinlock);
 194
 195                         do_dump++;
 196                         class_fail_export(export);
 197                         class_export_put(export);
 198                         spin_lock_bh(&waiting_locks_spinlock);
 199                 }
 200                 spin_unlock_bh(&waiting_locks_spinlock);
 201
 202                 if (do_dump && obd_dump_on_eviction) {
 203                         CERROR("dump the log upon eviction\n");
 204                         libcfs_debug_dumplog();
 205                 }
 206
 207                 if (expired_lock_thread.elt_state == ELT_TERMINATE)
 208                         break;
 209         }
 210
 211         expired_lock_thread.elt_state = ELT_STOPPED;
 212         cfs_waitq_signal(&expired_lock_thread.elt_waitq);
 213         RETURN(0);
 214 }
 215
 216 static int ldlm_add_waiting_lock(struct ldlm_lock *lock);
 217
 218 /* This is called from within a timer interrupt and cannot schedule */
 219 static void waiting_locks_callback(unsigned long unused)
 220 {
 221         struct ldlm_lock *lock, *last = NULL;
 222
 223 repeat:
 224         spin_lock_bh(&waiting_locks_spinlock);
 225         while (!list_empty(&waiting_locks_list)) {
 226                 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
 227                                   l_pending_chain);
 228
 229                 if (cfs_time_after(lock->l_callback_timeout, cfs_time_current()) ||
 230                     (lock->l_req_mode == LCK_GROUP))
 231                         break;
 232
 233                 if (ptlrpc_check_suspend()) {
 234                         /* there is a case when we talk to one mds, holding
 235                          * lock from another mds. this way we easily can get
 236                          * here, if second mds is being recovered. so, we
 237                          * suspend timeouts. bug 6019 */
 238
 239                         LDLM_ERROR(lock, "recharge timeout: %s@%s nid %s ",
 240                                    lock->l_export->exp_client_uuid.uuid,
 241                                    lock->l_export->exp_connection->c_remote_uuid.uuid,
 242                                    libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
 243
 244                         list_del_init(&lock->l_pending_chain);
 245                         spin_unlock_bh(&waiting_locks_spinlock);
 246                         ldlm_add_waiting_lock(lock);
 247                         goto repeat;
 248                 }
 249
 250                 /* if timeout overlaps the activation time of suspended timeouts
 251                  * then extend it to give a chance for client to reconnect */
 252                 if (cfs_time_before(cfs_time_sub(lock->l_callback_timeout,
 253                                                  cfs_time_seconds(obd_timeout)/2),
 254                                     ptlrpc_suspend_wakeup_time())) {
 255                         LDLM_ERROR(lock, "extend timeout due to recovery: %s@%s nid %s ",
 256                                    lock->l_export->exp_client_uuid.uuid,
 257                                    lock->l_export->exp_connection->c_remote_uuid.uuid,
 258                                    libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
 259
 260                         list_del_init(&lock->l_pending_chain);
 261                         spin_unlock_bh(&waiting_locks_spinlock);
 262                         ldlm_add_waiting_lock(lock);
 263                         goto repeat;
 264                 }
 265
 266                 LDLM_ERROR(lock, "lock callback timer expired: evicting client "
 267                            "%s@%s nid %s\n",
 268                            lock->l_export->exp_client_uuid.uuid,
 269                            lock->l_export->exp_connection->c_remote_uuid.uuid,
 270                            libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
 271
 272                 last = lock;
 273
 274                 list_del(&lock->l_pending_chain);
 275                 list_add(&lock->l_pending_chain,
 276                          &expired_lock_thread.elt_expired_locks);
 277         }
 278
 279         if (!list_empty(&expired_lock_thread.elt_expired_locks)) {
 280                 if (obd_dump_on_timeout)
 281                         expired_lock_thread.elt_dump = __LINE__;
 282
 283                 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
 284         }
 285
 286         /*
 287          * Make sure the timer will fire again if we have any locks
 288          * left.
 289          */
 290         if (!list_empty(&waiting_locks_list)) {
 291                 cfs_time_t timeout_rounded;
 292                 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
 293                                   l_pending_chain);
 294                 timeout_rounded = (cfs_time_t)round_timeout(lock->l_callback_timeout);
 295                 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
 296         }
 297         spin_unlock_bh(&waiting_locks_spinlock);
 298 }
 299
 300 /*
 301  * Indicate that we're waiting for a client to call us back cancelling a given
 302  * lock.  We add it to the pending-callback chain, and schedule the lock-timeout
 303  * timer to fire appropriately.  (We round up to the next second, to avoid
 304  * floods of timer firings during periods of high lock contention and traffic).
 305  *
 306  * Called with the namespace lock held.
 307  */
 308 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock)
 309 {
 310         cfs_time_t timeout_rounded;
 311
 312         if (!list_empty(&lock->l_pending_chain))
 313                 return 0;
 314
 315         lock->l_callback_timeout =cfs_time_add(cfs_time_current(),
 316                                                cfs_time_seconds(obd_timeout)/2);
 317
 318         timeout_rounded = round_timeout(lock->l_callback_timeout);
 319
 320         if (cfs_time_before(timeout_rounded, cfs_timer_deadline(&waiting_locks_timer)) ||
 321             !cfs_timer_is_armed(&waiting_locks_timer)) {
 322                 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
 323
 324         }
 325         list_add_tail(&lock->l_pending_chain, &waiting_locks_list); /* FIFO */
 326         return 1;
 327 }
 328
 329 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
 330 {
 331         int ret;
 332
 333         LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK));
 334
 335         spin_lock_bh(&waiting_locks_spinlock);
 336         if (lock->l_destroyed) {
 337                 static cfs_time_t next;
 338                 spin_unlock_bh(&waiting_locks_spinlock);
 339                 LDLM_ERROR(lock, "not waiting on destroyed lock (bug 5653)");
 340                 if (cfs_time_after(cfs_time_current(), next)) {
 341                         next = cfs_time_shift(14400);
 342                         libcfs_debug_dumpstack(NULL);
 343                 }
 344                 return 0;
 345         }
 346
 347         ret = __ldlm_add_waiting_lock(lock);
 348         spin_unlock_bh(&waiting_locks_spinlock);
 349
 350         LDLM_DEBUG(lock, "%sadding to wait list",
 351                    ret == 0 ? "not re-" : "");
 352         return ret;
 353 }
 354
 355 /*
 356  * Remove a lock from the pending list, likely because it had its cancellation
 357  * callback arrive without incident.  This adjusts the lock-timeout timer if
 358  * needed.  Returns 0 if the lock wasn't pending after all, 1 if it was.
 359  *
 360  * Called with namespace lock held.
 361  */
 362 int __ldlm_del_waiting_lock(struct ldlm_lock *lock)
 363 {
 364         struct list_head *list_next;
 365
 366         if (list_empty(&lock->l_pending_chain))
 367                 return 0;
 368
 369         list_next = lock->l_pending_chain.next;
 370         if (lock->l_pending_chain.prev == &waiting_locks_list) {
 371                 /* Removing the head of the list, adjust timer. */
 372                 if (list_next == &waiting_locks_list) {
 373                         /* No more, just cancel. */
 374                         cfs_timer_disarm(&waiting_locks_timer);
 375                 } else {
 376                         struct ldlm_lock *next;
 377                         next = list_entry(list_next, struct ldlm_lock,
 378                                           l_pending_chain);
 379                         cfs_timer_arm(&waiting_locks_timer,
 380                                       round_timeout(next->l_callback_timeout));
 381                 }
 382         }
 383         list_del_init(&lock->l_pending_chain);
 384
 385         return 1;
 386 }
 387
 388 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
 389 {
 390         int ret;
 391
 392         if (lock->l_export == NULL) {
 393                 /* We don't have a "waiting locks list" on clients. */
 394                 LDLM_DEBUG(lock, "client lock: no-op");
 395                 return 0;
 396         }
 397
 398         spin_lock_bh(&waiting_locks_spinlock);
 399         ret = __ldlm_del_waiting_lock(lock);
 400         spin_unlock_bh(&waiting_locks_spinlock);
 401
 402         LDLM_DEBUG(lock, "%s", ret == 0 ? "wasn't waiting" : "removed");
 403         return ret;
 404 }
 405
 406 /*
 407  * Prolong the lock
 408  *
 409  * Called with namespace lock held.
 410  */
 411 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock)
 412 {
 413         if (lock->l_export == NULL) {
 414                 /* We don't have a "waiting locks list" on clients. */
 415                 LDLM_DEBUG(lock, "client lock: no-op");
 416                 return 0;
 417         }
 418
 419         spin_lock_bh(&waiting_locks_spinlock);
 420
 421         if (list_empty(&lock->l_pending_chain)) {
 422                 spin_unlock_bh(&waiting_locks_spinlock);
 423                 LDLM_DEBUG(lock, "wasn't waiting");
 424                 return 0;
 425         }
 426
 427         __ldlm_del_waiting_lock(lock);
 428         __ldlm_add_waiting_lock(lock);
 429         spin_unlock_bh(&waiting_locks_spinlock);
 430
 431         LDLM_DEBUG(lock, "refreshed");
 432         return 1;
 433 }
 434
 435 #else /* !__KERNEL__ */
 436
 437 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
 438 {
 439         LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK));
 440         RETURN(1);
 441 }
 442
 443 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
 444 {
 445         RETURN(0);
 446 }
 447
 448 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock)
 449 {
 450         RETURN(0);
 451 }
 452 #endif /* __KERNEL__ */
 453
 454 static void ldlm_failed_ast(struct ldlm_lock *lock, int rc,
 455                             const char *ast_type)
 456 {
 457         struct ptlrpc_connection *conn = lock->l_export->exp_connection;
 458         char                     *str = libcfs_nid2str(conn->c_peer.nid);
 459
 460         LCONSOLE_ERROR_MSG(0x138, "A client on nid %s was evicted from "
 461                            "service %s.\n", str,
 462                            lock->l_export->exp_obd->obd_name);
 463
 464         LCONSOLE_ERROR_MSG(0x012, "Lock %s callback to %s timed out for "
 465                            "resource %d\n", ast_type,
 466                            obd_export_nid2str(lock->l_export), rc);
 467
 468         if (obd_dump_on_timeout)
 469                 libcfs_debug_dumplog();
 470         class_fail_export(lock->l_export);
 471 }
 472
 473 static int ldlm_handle_ast_error(struct ldlm_lock *lock,
 474                                  struct ptlrpc_request *req, int rc,
 475                                  const char *ast_type)
 476 {
 477         lnet_process_id_t peer = req->rq_import->imp_connection->c_peer;
 478
 479         if (rc == -ETIMEDOUT || rc == -EINTR || rc == -ENOTCONN) {
 480                 LASSERT(lock->l_export);
 481                 if (lock->l_export->exp_libclient) {
 482                         LDLM_DEBUG(lock, "%s AST to liblustre client (nid %s)"
 483                                    " timeout, just cancelling lock", ast_type,
 484                                    libcfs_nid2str(peer.nid));
 485                         ldlm_lock_cancel(lock);
 486                         rc = -ERESTART;
 487                 } else if (lock->l_flags & LDLM_FL_CANCEL) {
 488                         LDLM_DEBUG(lock, "%s AST timeout from nid %s, but "
 489                                    "cancel was received (AST reply lost?)",
 490                                    ast_type, libcfs_nid2str(peer.nid));
 491                         ldlm_lock_cancel(lock);
 492                         rc = -ERESTART;
 493                 } else {
 494                         ldlm_del_waiting_lock(lock);
 495                         ldlm_failed_ast(lock, rc, ast_type);
 496                 }
 497         } else if (rc) {
 498                 if (rc == -EINVAL)
 499                         LDLM_DEBUG(lock, "client (nid %s) returned %d"
 500                                " from %s AST - normal race",
 501                                libcfs_nid2str(peer.nid),
 502                                req->rq_repmsg ?
 503                                lustre_msg_get_status(req->rq_repmsg) : -1,
 504                                ast_type);
 505                 else
 506                         LDLM_ERROR(lock, "client (nid %s) returned %d "
 507                                    "from %s AST", libcfs_nid2str(peer.nid),
 508                                    (req->rq_repmsg != NULL) ?
 509                                    lustre_msg_get_status(req->rq_repmsg) : 0,
 510                                    ast_type);
 511                 ldlm_lock_cancel(lock);
 512                 /* Server-side AST functions are called from ldlm_reprocess_all,
 513                  * which needs to be told to please restart its reprocessing. */
 514                 rc = -ERESTART;
 515         }
 516
 517         return rc;
 518 }
 519
 520 static int ldlm_cb_interpret(struct ptlrpc_request *req, void *data, int rc)
 521 {
 522         struct ldlm_cb_set_arg *arg;
 523         struct ldlm_lock *lock;
 524         ENTRY;
 525
 526         LASSERT(data != NULL);
 527
 528         arg = req->rq_async_args.pointer_arg[0];
 529         lock = req->rq_async_args.pointer_arg[1];
 530         LASSERT(lock != NULL);
 531         if (rc != 0) {
 532                 /* If client canceled the lock but the cancel has not
 533                  * been recieved yet, we need to update lvbo to have the
 534                  * proper attributes cached. */
 535                 if (rc == -EINVAL && arg->type == LDLM_BL_CALLBACK)
 536                         ldlm_res_lvbo_update(lock->l_resource, NULL,
 537                                              0, 1);
 538                 rc = ldlm_handle_ast_error(lock, req, rc,
 539                                            arg->type == LDLM_BL_CALLBACK
 540                                            ? "blocking" : "completion");
 541         }
 542
 543         LDLM_LOCK_PUT(lock);
 544
 545         if (rc == -ERESTART)
 546                 atomic_set(&arg->restart, 1);
 547
 548         RETURN(0);
 549 }
 550
 551 static inline int ldlm_bl_and_cp_ast_fini(struct ptlrpc_request *req,
 552                                           struct ldlm_cb_set_arg *arg,
 553                                           struct ldlm_lock *lock,
 554                                           int instant_cancel)
 555 {
 556         int rc = 0;
 557         ENTRY;
 558
 559         if (unlikely(instant_cancel)) {
 560                 rc = ptl_send_rpc(req, 1);
 561                 ptlrpc_req_finished(req);
 562                 if (rc == 0)
 563                         /* If we cancelled the lock, we need to restart
 564                          * ldlm_reprocess_queue */
 565                         atomic_set(&arg->restart, 1);
 566         } else {
 567                 LDLM_LOCK_GET(lock);
 568                 ptlrpc_set_add_req(arg->set, req);
 569         }
 570
 571         RETURN(rc);
 572 }
 573
 574 /*
 575  * ->l_blocking_ast() method for server-side locks. This is invoked when newly
 576  * enqueued server lock conflicts with given one.
 577  *
 578  * Sends blocking ast rpc to the client owning that lock; arms timeout timer
 579  * to wait for client response.
 580  */
 581 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
 582                              struct ldlm_lock_desc *desc,
 583                              void *data, int flag)
 584 {
 585         struct ldlm_cb_set_arg *arg = data;
 586         struct ldlm_request    *body;
 587         struct ptlrpc_request  *req;
 588         int                     instant_cancel = 0;
 589         int                     rc = 0;
 590         ENTRY;
 591
 592         if (flag == LDLM_CB_CANCELING)
 593                 /* Don't need to do anything here. */
 594                 RETURN(0);
 595
 596         LASSERT(lock);
 597         LASSERT(data != NULL);
 598         if (lock->l_export->exp_obd->obd_recovering != 0) {
 599                 LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
 600                 ldlm_lock_dump(D_ERROR, lock, 0);
 601         }
 602
 603         req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
 604                                         &RQF_LDLM_BL_CALLBACK,
 605                                         LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK);
 606         if (req == NULL)
 607                 RETURN(-ENOMEM);
 608
 609         req->rq_async_args.pointer_arg[0] = arg;
 610         req->rq_async_args.pointer_arg[1] = lock;
 611         req->rq_interpret_reply = ldlm_cb_interpret;
 612         req->rq_no_resend = 1;
 613
 614         lock_res(lock->l_resource);
 615         if (lock->l_granted_mode != lock->l_req_mode) {
 616                 /* this blocking AST will be communicated as part of the
 617                  * completion AST instead */
 618                 unlock_res(lock->l_resource);
 619                 ptlrpc_req_finished(req);
 620                 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
 621                 RETURN(0);
 622         }
 623
 624         if (lock->l_destroyed) {
 625                 /* What's the point? */
 626                 unlock_res(lock->l_resource);
 627                 ptlrpc_req_finished(req);
 628                 RETURN(0);
 629         }
 630
 631         if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
 632                 instant_cancel = 1;
 633
 634         body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
 635         body->lock_handle[0] = lock->l_remote_handle;
 636         body->lock_desc = *desc;
 637         body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
 638
 639         LDLM_DEBUG(lock, "server preparing blocking AST");
 640
 641         ptlrpc_request_set_replen(req);
 642         if (instant_cancel) {
 643                 unlock_res(lock->l_resource);
 644                 ldlm_lock_cancel(lock);
 645         } else {
 646                 LASSERT(lock->l_granted_mode == lock->l_req_mode);
 647                 ldlm_add_waiting_lock(lock);
 648                 unlock_res(lock->l_resource);
 649         }
 650
 651         req->rq_send_state = LUSTRE_IMP_FULL;
 652         req->rq_timeout = ldlm_get_rq_timeout(ldlm_timeout, obd_timeout);
 653
 654         if (lock->l_export && lock->l_export->exp_ldlm_stats)
 655                 lprocfs_counter_incr(lock->l_export->exp_ldlm_stats,
 656                                      LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
 657
 658         rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
 659
 660         RETURN(rc);
 661 }
 662
 663 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data)
 664 {
 665         struct ldlm_cb_set_arg *arg = data;
 666         struct ldlm_request    *body;
 667         struct ptlrpc_request  *req;
 668         struct timeval          granted_time;
 669         long                    total_enqueue_wait;
 670         int                     instant_cancel = 0;
 671         int                     rc = 0;
 672         ENTRY;
 673
 674         LASSERT(lock != NULL);
 675         LASSERT(data != NULL);
 676
 677         do_gettimeofday(&granted_time);
 678         total_enqueue_wait = cfs_timeval_sub(&granted_time,
 679                                              &lock->l_enqueued_time, NULL);
 680
 681         if (total_enqueue_wait / 1000000 > obd_timeout)
 682                 LDLM_ERROR(lock, "enqueue wait took %luus from %lu",
 683                            total_enqueue_wait, lock->l_enqueued_time.tv_sec);
 684
 685          req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse,
 686                                     &RQF_LDLM_CP_CALLBACK);
 687          if (req == NULL)
 688                  RETURN(-ENOMEM);
 689
 690         lock_res_and_lock(lock);
 691         if (lock->l_resource->lr_lvb_len)
 692                  req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT,
 693                                       lock->l_resource->lr_lvb_len);
 694         unlock_res_and_lock(lock);
 695
 696         rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK);
 697         if (rc) {
 698                 ptlrpc_request_free(req);
 699                 RETURN(rc);
 700         }
 701
 702         req->rq_async_args.pointer_arg[0] = arg;
 703         req->rq_async_args.pointer_arg[1] = lock;
 704         req->rq_interpret_reply = ldlm_cb_interpret;
 705         req->rq_no_resend = 1;
 706         body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
 707
 708         body->lock_handle[0] = lock->l_remote_handle;
 709         body->lock_flags = flags;
 710         ldlm_lock2desc(lock, &body->lock_desc);
 711         if (lock->l_resource->lr_lvb_len) {
 712                 void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB);
 713
 714                 lock_res_and_lock(lock);
 715                 memcpy(lvb, lock->l_resource->lr_lvb_data,
 716                        lock->l_resource->lr_lvb_len);
 717                 unlock_res_and_lock(lock);
 718         }
 719
 720         LDLM_DEBUG(lock, "server preparing completion AST (after %ldus wait)",
 721                    total_enqueue_wait);
 722
 723         ptlrpc_request_set_replen(req);
 724         req->rq_send_state = LUSTRE_IMP_FULL;
 725         req->rq_timeout = ldlm_get_rq_timeout(ldlm_timeout, obd_timeout);
 726
 727         /* We only send real blocking ASTs after the lock is granted */
 728         lock_res_and_lock(lock);
 729         if (lock->l_flags & LDLM_FL_AST_SENT) {
 730                 body->lock_flags |= LDLM_FL_AST_SENT;
 731
 732                 /* We might get here prior to ldlm_handle_enqueue setting
 733                  * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
 734                  * into waiting list, but this is safe and similar code in
 735                  * ldlm_handle_enqueue will call ldlm_lock_cancel() still,
 736                  * that would not only cancel the lock, but will also remove
 737                  * it from waiting list */
 738                 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
 739                         unlock_res_and_lock(lock);
 740                         ldlm_lock_cancel(lock);
 741                         instant_cancel = 1;
 742                         lock_res_and_lock(lock);
 743                 } else {
 744                         /* start the lock-timeout clock */
 745                         ldlm_add_waiting_lock(lock);
 746                 }
 747         }
 748         unlock_res_and_lock(lock);
 749
 750         if (lock->l_export && lock->l_export->exp_ldlm_stats)
 751                 lprocfs_counter_incr(lock->l_export->exp_ldlm_stats,
 752                                      LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
 753
 754         rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
 755
 756         RETURN(rc);
 757 }
 758
 759 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
 760 {
 761         struct ldlm_resource  *res = lock->l_resource;
 762         struct ldlm_request   *body;
 763         struct ptlrpc_request *req;
 764         int                    rc;
 765         ENTRY;
 766
 767         LASSERT(lock != NULL);
 768
 769         req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
 770                                         &RQF_LDLM_GL_CALLBACK,
 771                                         LUSTRE_DLM_VERSION, LDLM_GL_CALLBACK);
 772
 773         if (req == NULL)
 774                 RETURN(-ENOMEM);
 775
 776         body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
 777         body->lock_handle[0] = lock->l_remote_handle;
 778         ldlm_lock2desc(lock, &body->lock_desc);
 779
 780         lock_res_and_lock(lock);
 781         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
 782                              lock->l_resource->lr_lvb_len);
 783         unlock_res_and_lock(lock);
 784         res = lock->l_resource;
 785         ptlrpc_request_set_replen(req);
 786
 787
 788         req->rq_send_state = LUSTRE_IMP_FULL;
 789         req->rq_timeout = ldlm_get_rq_timeout(ldlm_timeout, obd_timeout);
 790
 791         if (lock->l_export && lock->l_export->exp_ldlm_stats)
 792                 lprocfs_counter_incr(lock->l_export->exp_ldlm_stats,
 793                                      LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
 794
 795         rc = ptlrpc_queue_wait(req);
 796         if (rc == -ELDLM_NO_LOCK_DATA)
 797                 LDLM_DEBUG(lock, "lost race - client has a lock but no inode");
 798         else if (rc != 0)
 799                 rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
 800         else
 801                 rc = ldlm_res_lvbo_update(res, req->rq_repmsg,
 802                                           REPLY_REC_OFF, 1);
 803         ptlrpc_req_finished(req);
 804         RETURN(rc);
 805 }
 806
 807 static struct ldlm_lock *
 808 find_existing_lock(struct obd_export *exp,
 809                    const struct lustre_handle *remote_hdl)
 810 {
 811         struct list_head *iter;
 812
 813         spin_lock(&exp->exp_ldlm_data.led_lock);
 814         list_for_each(iter, &exp->exp_ldlm_data.led_held_locks) {
 815                 struct ldlm_lock *lock;
 816                 lock = list_entry(iter, struct ldlm_lock, l_export_chain);
 817                 if (lock->l_remote_handle.cookie == remote_hdl->cookie) {
 818                         LDLM_LOCK_GET(lock);
 819                         spin_unlock(&exp->exp_ldlm_data.led_lock);
 820                         return lock;
 821                 }
 822         }
 823         spin_unlock(&exp->exp_ldlm_data.led_lock);
 824         return NULL;
 825 }
 826
 827 #ifdef __KERNEL__
 828 extern unsigned long long lu_time_stamp_get(void);
 829 #else
 830 #define lu_time_stamp_get() time(NULL)
 831 #endif
 832
 833 static void ldlm_svc_get_eopc(const struct ldlm_request *dlm_req,
 834                        struct lprocfs_stats *srv_stats)
 835 {
 836         int lock_type = 0, op = 0;
 837
 838         lock_type = dlm_req->lock_desc.l_resource.lr_type;
 839
 840         switch (lock_type) {
 841         case LDLM_PLAIN:
 842                 op = PTLRPC_LAST_CNTR + LDLM_PLAIN_ENQUEUE;
 843                 break;
 844         case LDLM_EXTENT:
 845                 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT)
 846                         op = PTLRPC_LAST_CNTR + LDLM_GLIMPSE_ENQUEUE;
 847                 else
 848                         op = PTLRPC_LAST_CNTR + LDLM_EXTENT_ENQUEUE;
 849                 break;
 850         case LDLM_FLOCK:
 851                 op = PTLRPC_LAST_CNTR + LDLM_FLOCK_ENQUEUE;
 852                 break;
 853         case LDLM_IBITS:
 854                 op = PTLRPC_LAST_CNTR + LDLM_IBITS_ENQUEUE;
 855                 break;
 856         default:
 857                 op = 0;
 858                 break;
 859         }
 860
 861         if (op)
 862                 lprocfs_counter_incr(srv_stats, op);
 863
 864         return ;
 865 }
 866
 867 /*
 868  * Main server-side entry point into LDLM. This is called by ptlrpc service
 869  * threads to carry out client lock enqueueing requests.
 870  */
 871 int ldlm_handle_enqueue0(struct ldlm_namespace *ns,
 872                          struct ptlrpc_request *req,
 873                          const struct ldlm_request *dlm_req,
 874                          const struct ldlm_callback_suite *cbs)
 875 {
 876         struct ldlm_reply *dlm_rep;
 877         __u32 flags;
 878         ldlm_error_t err = ELDLM_OK;
 879         struct ldlm_lock *lock = NULL;
 880         void *cookie = NULL;
 881         int rc = 0;
 882         ENTRY;
 883
 884         LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
 885
 886         ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF);
 887         flags = dlm_req->lock_flags;
 888
 889         LASSERT(req->rq_export);
 890
 891         if (req->rq_rqbd->rqbd_service->srv_stats)
 892                 ldlm_svc_get_eopc(dlm_req,
 893                                   req->rq_rqbd->rqbd_service->srv_stats);
 894
 895         if (req->rq_export->exp_ldlm_stats)
 896                 lprocfs_counter_incr(req->rq_export->exp_ldlm_stats,
 897                                      LDLM_ENQUEUE - LDLM_FIRST_OPC);
 898
 899         if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE ||
 900                      dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) {
 901                 DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
 902                           dlm_req->lock_desc.l_resource.lr_type);
 903                 GOTO(out, rc = -EFAULT);
 904         }
 905
 906         if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE ||
 907                      dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE ||
 908                      dlm_req->lock_desc.l_req_mode &
 909                      (dlm_req->lock_desc.l_req_mode-1))) {
 910                 DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
 911                           dlm_req->lock_desc.l_req_mode);
 912                 GOTO(out, rc = -EFAULT);
 913         }
 914
 915         if (req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) {
 916                 if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
 917                              LDLM_PLAIN)) {
 918                         DEBUG_REQ(D_ERROR, req,
 919                                   "PLAIN lock request from IBITS client?");
 920                         GOTO(out, rc = -EPROTO);
 921                 }
 922         } else if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
 923                             LDLM_IBITS)) {
 924                 DEBUG_REQ(D_ERROR, req,
 925                           "IBITS lock request from unaware client?");
 926                 GOTO(out, rc = -EPROTO);
 927         }
 928
 929 #if 0
 930         /* FIXME this makes it impossible to use LDLM_PLAIN locks -- check
 931            against server's _CONNECT_SUPPORTED flags? (I don't want to use
 932            ibits for mgc/mgs) */
 933
 934         /* INODEBITS_INTEROP: Perform conversion from plain lock to
 935          * inodebits lock if client does not support them. */
 936         if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) &&
 937             (dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN)) {
 938                 dlm_req->lock_desc.l_resource.lr_type = LDLM_IBITS;
 939                 dlm_req->lock_desc.l_policy_data.l_inodebits.bits =
 940                         MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE;
 941                 if (dlm_req->lock_desc.l_req_mode == LCK_PR)
 942                         dlm_req->lock_desc.l_req_mode = LCK_CR;
 943         }
 944 #endif
 945
 946         if (unlikely(flags & LDLM_FL_REPLAY)) {
 947                 lock = find_existing_lock(req->rq_export,
 948                                           &dlm_req->lock_handle[0]);
 949                 if (lock != NULL) {
 950                         DEBUG_REQ(D_DLMTRACE, req, "found existing lock cookie "
 951                                   LPX64, lock->l_handle.h_cookie);
 952                         GOTO(existing_lock, rc = 0);
 953                 }
 954         }
 955
 956         /* The lock's callback data might be set in the policy function */
 957         lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
 958                                 dlm_req->lock_desc.l_resource.lr_type,
 959                                 dlm_req->lock_desc.l_req_mode,
 960                                 cbs->lcs_blocking, cbs->lcs_completion,
 961                                 cbs->lcs_glimpse, NULL, 0);
 962
 963         if (!lock)
 964                 GOTO(out, rc = -ENOMEM);
 965
 966         do_gettimeofday(&lock->l_enqueued_time);
 967         lock->l_remote_handle = dlm_req->lock_handle[0];
 968         LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
 969
 970         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
 971         /* Don't enqueue a lock onto the export if it has already
 972          * been evicted.  Cancel it now instead. (bug 3822) */
 973         if (req->rq_export->exp_failed) {
 974                 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
 975                 GOTO(out, rc = -ENOTCONN);
 976         }
 977         lock->l_export = class_export_get(req->rq_export);
 978         spin_lock(&lock->l_export->exp_ldlm_data.led_lock);
 979         list_add(&lock->l_export_chain,
 980                  &lock->l_export->exp_ldlm_data.led_held_locks);
 981         spin_unlock(&lock->l_export->exp_ldlm_data.led_lock);
 982
 983 existing_lock:
 984
 985         if (flags & LDLM_FL_HAS_INTENT) {
 986                 /* In this case, the reply buffer is allocated deep in
 987                  * local_lock_enqueue by the policy function. */
 988                 cookie = req;
 989         } else {
 990                 lock_res_and_lock(lock);
 991                 if (lock->l_resource->lr_lvb_len) {
 992                         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
 993                                              RCL_SERVER,
 994                                              lock->l_resource->lr_lvb_len);
 995                 }
 996                 unlock_res_and_lock(lock);
 997
 998                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
 999                         GOTO(out, rc = -ENOMEM);
1000
1001                 rc = req_capsule_server_pack(&req->rq_pill);
1002                 if (rc)
1003                         GOTO(out, rc);
1004         }
1005
1006         if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN)
1007                 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1008         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
1009                 lock->l_req_extent = lock->l_policy_data.l_extent;
1010
1011         err = ldlm_lock_enqueue(ns, &lock, cookie, (int *)&flags);
1012         if (err)
1013                 GOTO(out, err);
1014
1015         dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1016         dlm_rep->lock_flags = flags;
1017
1018         ldlm_lock2desc(lock, &dlm_rep->lock_desc);
1019         ldlm_lock2handle(lock, &dlm_rep->lock_handle);
1020
1021         /* We never send a blocking AST until the lock is granted, but
1022          * we can tell it right now */
1023         lock_res_and_lock(lock);
1024
1025         /* Now take into account flags to be inherited from original lock
1026            request both in reply to client and in our own lock flags. */
1027         dlm_rep->lock_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1028         lock->l_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1029
1030         /* Don't move a pending lock onto the export if it has already
1031          * been evicted.  Cancel it now instead. (bug 5683) */
1032         if (unlikely(req->rq_export->exp_failed ||
1033                      OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
1034                 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1035                 rc = -ENOTCONN;
1036         } else if (lock->l_flags & LDLM_FL_AST_SENT) {
1037                 dlm_rep->lock_flags |= LDLM_FL_AST_SENT;
1038                 if (lock->l_granted_mode == lock->l_req_mode) {
1039                         /*
1040                          * Only cancel lock if it was granted, because it would
1041                          * be destroyed immediatelly and would never be granted
1042                          * in the future, causing timeouts on client.  Not
1043                          * granted lock will be cancelled immediatelly after
1044                          * sending completion AST.
1045                          */
1046                         if (dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1047                                 unlock_res_and_lock(lock);
1048                                 ldlm_lock_cancel(lock);
1049                                 lock_res_and_lock(lock);
1050                         } else
1051                                 ldlm_add_waiting_lock(lock);
1052                 }
1053         }
1054         /* Make sure we never ever grant usual metadata locks to liblustre
1055            clients */
1056         if ((dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN ||
1057             dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) &&
1058              req->rq_export->exp_libclient) {
1059                 if (unlikely(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) ||
1060                              !(dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK))){
1061                         CERROR("Granting sync lock to libclient. "
1062                                "req fl %d, rep fl %d, lock fl %d\n",
1063                                dlm_req->lock_flags, dlm_rep->lock_flags,
1064                                lock->l_flags);
1065                         LDLM_ERROR(lock, "sync lock");
1066                         if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT) {
1067                                 struct ldlm_intent *it;
1068
1069                                 it = req_capsule_client_get(&req->rq_pill,
1070                                                             &RMF_LDLM_INTENT);
1071                                 if (it != NULL) {
1072                                         CERROR("This is intent %s ("LPU64")\n",
1073                                                ldlm_it2str(it->opc), it->opc);
1074                                 }
1075                         }
1076                 }
1077         }
1078
1079         unlock_res_and_lock(lock);
1080
1081         EXIT;
1082  out:
1083         req->rq_status = err;
1084         if (req->rq_reply_state == NULL) {
1085                 err = lustre_pack_reply(req, 1, NULL, NULL);
1086                 if (rc == 0)
1087                         rc = err;
1088                 req->rq_status = rc;
1089         }
1090
1091         /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
1092          * ldlm_reprocess_all.  If this moves, revisit that code. -phil */
1093         if (lock) {
1094                 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
1095                            "(err=%d, rc=%d)", err, rc);
1096
1097                 lock_res_and_lock(lock);
1098                 if (rc == 0) {
1099                         if (lock->l_resource->lr_lvb_len > 0) {
1100                                 void *lvb;
1101
1102                                 lvb = req_capsule_server_get(&req->rq_pill,
1103                                                              &RMF_DLM_LVB);
1104                                 LASSERTF(lvb != NULL, "req %p, lock %p\n",
1105                                          req, lock);
1106
1107                                 memcpy(lvb, lock->l_resource->lr_lvb_data,
1108                                        lock->l_resource->lr_lvb_len);
1109                         }
1110                 } else {
1111                         ldlm_resource_unlink_lock(lock);
1112                         ldlm_lock_destroy_nolock(lock);
1113                 }
1114                 unlock_res_and_lock(lock);
1115
1116                 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
1117                         ldlm_reprocess_all(lock->l_resource);
1118
1119                 LDLM_LOCK_PUT(lock);
1120         }
1121
1122         LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
1123                           lock, rc);
1124
1125         return rc;
1126 }
1127
1128 int ldlm_handle_enqueue(struct ptlrpc_request *req,
1129                         ldlm_completion_callback completion_callback,
1130                         ldlm_blocking_callback blocking_callback,
1131                         ldlm_glimpse_callback glimpse_callback)
1132 {
1133         struct ldlm_request *dlm_req;
1134         struct ldlm_callback_suite cbs = {
1135                 .lcs_completion = completion_callback,
1136                 .lcs_blocking   = blocking_callback,
1137                 .lcs_glimpse    = glimpse_callback
1138         };
1139         int rc;
1140
1141         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1142         if (dlm_req != NULL) {
1143                 rc = ldlm_handle_enqueue0(req->rq_export->exp_obd->obd_namespace,
1144                                           req, dlm_req, &cbs);
1145         } else {
1146                 rc = -EFAULT;
1147         }
1148         return rc;
1149 }
1150
1151 int ldlm_handle_convert0(struct ptlrpc_request *req,
1152                          const struct ldlm_request *dlm_req)
1153 {
1154         struct ldlm_reply *dlm_rep;
1155         struct ldlm_lock *lock;
1156         int rc;
1157         ENTRY;
1158
1159         if (req->rq_export && req->rq_export->exp_ldlm_stats)
1160                 lprocfs_counter_incr(req->rq_export->exp_ldlm_stats,
1161                                      LDLM_CONVERT - LDLM_FIRST_OPC);
1162
1163         rc = req_capsule_server_pack(&req->rq_pill);
1164         if (rc)
1165                 RETURN(rc);
1166
1167         dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1168         dlm_rep->lock_flags = dlm_req->lock_flags;
1169
1170         lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
1171         if (!lock) {
1172                 req->rq_status = EINVAL;
1173         } else {
1174                 void *res = NULL;
1175
1176                 LDLM_DEBUG(lock, "server-side convert handler START");
1177
1178                 do_gettimeofday(&lock->l_enqueued_time);
1179                 res = ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
1180                                         &dlm_rep->lock_flags);
1181                 if (res) {
1182                         if (ldlm_del_waiting_lock(lock))
1183                                 LDLM_DEBUG(lock, "converted waiting lock");
1184                         req->rq_status = 0;
1185                 } else {
1186                         req->rq_status = EDEADLOCK;
1187                 }
1188         }
1189
1190         if (lock) {
1191                 if (!req->rq_status)
1192                         ldlm_reprocess_all(lock->l_resource);
1193                 LDLM_DEBUG(lock, "server-side convert handler END");
1194                 LDLM_LOCK_PUT(lock);
1195         } else
1196                 LDLM_DEBUG_NOLOCK("server-side convert handler END");
1197
1198         RETURN(0);
1199 }
1200
1201 int ldlm_handle_convert(struct ptlrpc_request *req)
1202 {
1203         int rc;
1204         struct ldlm_request *dlm_req;
1205
1206         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1207         if (dlm_req != NULL) {
1208                 rc = ldlm_handle_convert0(req, dlm_req);
1209         } else {
1210                 CERROR ("Can't unpack dlm_req\n");
1211                 rc = -EFAULT;
1212         }
1213         return rc;
1214 }
1215
1216 /* Cancel all the locks, which handles are packed into ldlm_request */
1217 int ldlm_request_cancel(struct ptlrpc_request *req,
1218                         const struct ldlm_request *dlm_req, int first)
1219 {
1220         struct ldlm_resource *res, *pres = NULL;
1221         struct ldlm_lock *lock;
1222         int i, count, done = 0;
1223         ENTRY;
1224
1225         count = dlm_req->lock_count ? dlm_req->lock_count : 1;
1226         if (first >= count)
1227                 RETURN(0);
1228
1229         /* There is no lock on the server at the replay time,
1230          * skip lock cancelling to make replay tests to pass. */
1231         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1232                 RETURN(0);
1233
1234         LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, "
1235                           "starting at %d", count, first);
1236
1237         for (i = first; i < count; i++) {
1238                 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
1239                 if (!lock) {
1240                         LDLM_DEBUG_NOLOCK("server-side cancel handler stale "
1241                                           "lock (cookie "LPU64")",
1242                                           dlm_req->lock_handle[i].cookie);
1243                         continue;
1244                 }
1245
1246                 res = lock->l_resource;
1247                 done++;
1248
1249                 if (res != pres) {
1250                         if (pres != NULL) {
1251                                 ldlm_reprocess_all(pres);
1252                                 ldlm_resource_putref(pres);
1253                         }
1254                         if (res != NULL) {
1255                                 ldlm_resource_getref(res);
1256                                 ldlm_res_lvbo_update(res, NULL, 0, 1);
1257                         }
1258                         pres = res;
1259                 }
1260                 ldlm_lock_cancel(lock);
1261                 LDLM_LOCK_PUT(lock);
1262         }
1263         if (pres != NULL) {
1264                 ldlm_reprocess_all(pres);
1265                 ldlm_resource_putref(pres);
1266         }
1267         LDLM_DEBUG_NOLOCK("server-side cancel handler END");
1268         RETURN(done);
1269 }
1270
1271 int ldlm_handle_cancel(struct ptlrpc_request *req)
1272 {
1273         struct ldlm_request *dlm_req;
1274         int rc;
1275         ENTRY;
1276
1277         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1278         if (dlm_req == NULL) {
1279                 CDEBUG(D_INFO, "bad request buffer for cancel\n");
1280                 RETURN(-EFAULT);
1281         }
1282
1283         if (req->rq_export && req->rq_export->exp_ldlm_stats)
1284                 lprocfs_counter_incr(req->rq_export->exp_ldlm_stats,
1285                                      LDLM_CANCEL - LDLM_FIRST_OPC);
1286
1287         rc = req_capsule_server_pack(&req->rq_pill);
1288         if (rc)
1289                 RETURN(rc);
1290
1291         if (!ldlm_request_cancel(req, dlm_req, 0))
1292                 req->rq_status = ESTALE;
1293
1294         if (ptlrpc_reply(req) != 0)
1295                 LBUG();
1296
1297         RETURN(0);
1298 }
1299
1300 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
1301                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1302 {
1303         int do_ast;
1304         ENTRY;
1305
1306         LDLM_DEBUG(lock, "client blocking AST callback handler START");
1307
1308         lock_res_and_lock(lock);
1309         lock->l_flags |= LDLM_FL_CBPENDING;
1310
1311         if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
1312                 lock->l_flags |= LDLM_FL_CANCEL;
1313
1314         do_ast = (!lock->l_readers && !lock->l_writers);
1315         unlock_res_and_lock(lock);
1316
1317         if (do_ast) {
1318                 LDLM_DEBUG(lock, "already unused, calling "
1319                            "callback (%p)", lock->l_blocking_ast);
1320                 if (lock->l_blocking_ast != NULL)
1321                         lock->l_blocking_ast(lock, ld, lock->l_ast_data,
1322                                              LDLM_CB_BLOCKING);
1323         } else {
1324                 LDLM_DEBUG(lock, "Lock still has references, will be"
1325                            " cancelled later");
1326         }
1327
1328         LDLM_DEBUG(lock, "client blocking callback handler END");
1329         LDLM_LOCK_PUT(lock);
1330         EXIT;
1331 }
1332
1333 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
1334                                     struct ldlm_namespace *ns,
1335                                     struct ldlm_request *dlm_req,
1336                                     struct ldlm_lock *lock)
1337 {
1338         CFS_LIST_HEAD(ast_list);
1339         ENTRY;
1340
1341         LDLM_DEBUG(lock, "client completion callback handler START");
1342
1343         lock_res_and_lock(lock);
1344
1345         /* If we receive the completion AST before the actual enqueue returned,
1346          * then we might need to switch lock modes, resources, or extents. */
1347         if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
1348                 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
1349                 LDLM_DEBUG(lock, "completion AST, new lock mode");
1350         }
1351
1352         if (lock->l_resource->lr_type != LDLM_PLAIN) {
1353                 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1354                 LDLM_DEBUG(lock, "completion AST, new policy data");
1355         }
1356
1357         ldlm_resource_unlink_lock(lock);
1358         if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
1359                    &lock->l_resource->lr_name,
1360                    sizeof(lock->l_resource->lr_name)) != 0) {
1361                 unlock_res_and_lock(lock);
1362                 ldlm_lock_change_resource(ns, lock,
1363                                         &dlm_req->lock_desc.l_resource.lr_name);
1364                 LDLM_DEBUG(lock, "completion AST, new resource");
1365                 CERROR("change resource!\n");
1366                 lock_res_and_lock(lock);
1367         }
1368
1369         if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
1370                 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
1371                 LDLM_DEBUG(lock, "completion AST includes blocking AST");
1372         }
1373
1374         if (lock->l_lvb_len) {
1375                 if (req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB,
1376                                          RCL_CLIENT) < lock->l_lvb_len) {
1377                         LDLM_ERROR(lock, "completion AST did not contain "
1378                                    "expected LVB!");
1379                 } else {
1380                         void *lvb = req_capsule_client_swab_get(&req->rq_pill,
1381                                                                 &RMF_DLM_LVB,
1382                                                   (void *)lock->l_lvb_swabber);
1383                         memcpy(lock->l_lvb_data, lvb, lock->l_lvb_len);
1384                 }
1385         }
1386
1387         ldlm_grant_lock(lock, &ast_list);
1388         unlock_res_and_lock(lock);
1389
1390         LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
1391
1392         ldlm_run_ast_work(&ast_list, LDLM_WORK_CP_AST);
1393
1394         LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
1395                           lock);
1396         LDLM_LOCK_PUT(lock);
1397         EXIT;
1398 }
1399
1400 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
1401                                     struct ldlm_namespace *ns,
1402                                     struct ldlm_request *dlm_req,
1403                                     struct ldlm_lock *lock)
1404 {
1405         int rc = -ENOSYS;
1406         ENTRY;
1407
1408         LDLM_DEBUG(lock, "client glimpse AST callback handler");
1409
1410         if (lock->l_glimpse_ast != NULL)
1411                 rc = lock->l_glimpse_ast(lock, req);
1412
1413         if (req->rq_repmsg != NULL) {
1414                 ptlrpc_reply(req);
1415         } else {
1416                 req->rq_status = rc;
1417                 ptlrpc_error(req);
1418         }
1419
1420         lock_res_and_lock(lock);
1421         if (lock->l_granted_mode == LCK_PW &&
1422             !lock->l_readers && !lock->l_writers &&
1423             cfs_time_after(cfs_time_current(),
1424                            cfs_time_add(lock->l_last_used,
1425                                         cfs_time_seconds(10)))) {
1426                 unlock_res_and_lock(lock);
1427                 if (ldlm_bl_to_thread_lock(ns, NULL, lock))
1428                         ldlm_handle_bl_callback(ns, NULL, lock);
1429
1430                 EXIT;
1431                 return;
1432         }
1433         unlock_res_and_lock(lock);
1434         LDLM_LOCK_PUT(lock);
1435         EXIT;
1436 }
1437
1438 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1439 {
1440         if (req->rq_no_reply)
1441                 return 0;
1442
1443         req->rq_status = rc;
1444         if (req->rq_reply_state == NULL) {
1445                 rc = lustre_pack_reply(req, 1, NULL, NULL);
1446                 if (rc)
1447                         return rc;
1448         }
1449         return ptlrpc_reply(req);
1450 }
1451
1452 #ifdef __KERNEL__
1453 static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
1454                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock,
1455                              struct list_head *cancels, int count)
1456 {
1457         struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1458         struct ldlm_bl_work_item *blwi;
1459         ENTRY;
1460
1461         if (cancels && count == 0)
1462                 RETURN(0);
1463
1464         OBD_ALLOC(blwi, sizeof(*blwi));
1465         if (blwi == NULL)
1466                 RETURN(-ENOMEM);
1467
1468         blwi->blwi_ns = ns;
1469         if (ld != NULL)
1470                 blwi->blwi_ld = *ld;
1471         if (count) {
1472                 list_add(&blwi->blwi_head, cancels);
1473                 list_del_init(cancels);
1474                 blwi->blwi_count = count;
1475         } else {
1476                 blwi->blwi_lock = lock;
1477         }
1478         spin_lock(&blp->blp_lock);
1479         if (lock && lock->l_flags & LDLM_FL_DISCARD_DATA) {
1480                 /* add LDLM_FL_DISCARD_DATA requests to the priority list */
1481                 list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
1482         } else {
1483                 /* other blocking callbacks are added to the regular list */
1484                 list_add_tail(&blwi->blwi_entry, &blp->blp_list);
1485         }
1486         cfs_waitq_signal(&blp->blp_waitq);
1487         spin_unlock(&blp->blp_lock);
1488
1489         RETURN(0);
1490 }
1491 #endif
1492
1493 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1494                            struct ldlm_lock *lock)
1495 {
1496 #ifdef __KERNEL__
1497         RETURN(ldlm_bl_to_thread(ns, ld, lock, NULL, 0));
1498 #else
1499         RETURN(-ENOSYS);
1500 #endif
1501 }
1502
1503 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1504                            struct list_head *cancels, int count)
1505 {
1506 #ifdef __KERNEL__
1507         RETURN(ldlm_bl_to_thread(ns, ld, NULL, cancels, count));
1508 #else
1509         RETURN(-ENOSYS);
1510 #endif
1511 }
1512
1513 /* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */
1514 static int ldlm_callback_handler(struct ptlrpc_request *req)
1515 {
1516         struct ldlm_namespace *ns;
1517         struct ldlm_request *dlm_req;
1518         struct ldlm_lock *lock;
1519         int rc;
1520         ENTRY;
1521
1522         /* Requests arrive in sender's byte order.  The ptlrpc service
1523          * handler has already checked and, if necessary, byte-swapped the
1524          * incoming request message body, but I am responsible for the
1525          * message buffers. */
1526
1527         /* do nothing for sec context finalize */
1528         if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI)
1529                 RETURN(0);
1530
1531         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
1532
1533         if (req->rq_export == NULL) {
1534                 struct ldlm_request *dlm_req;
1535
1536                 CDEBUG(D_RPCTRACE, "operation %d from %s with bad "
1537                        "export cookie "LPX64"; this is "
1538                        "normal if this node rebooted with a lock held\n",
1539                        lustre_msg_get_opc(req->rq_reqmsg),
1540                        libcfs_id2str(req->rq_peer),
1541                        lustre_msg_get_handle(req->rq_reqmsg)->cookie);
1542
1543                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1544                 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1545                 if (dlm_req != NULL)
1546                         CDEBUG(D_RPCTRACE, "--> lock cookie: "LPX64"\n",
1547                                dlm_req->lock_handle[0].cookie);
1548
1549                 ldlm_callback_reply(req, -ENOTCONN);
1550                 RETURN(0);
1551         }
1552
1553         LASSERT(req->rq_export != NULL);
1554         LASSERT(req->rq_export->exp_obd != NULL);
1555
1556         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1557         case LDLM_BL_CALLBACK:
1558                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK))
1559                         RETURN(0);
1560                 break;
1561         case LDLM_CP_CALLBACK:
1562                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK))
1563                         RETURN(0);
1564                 break;
1565         case LDLM_GL_CALLBACK:
1566                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK))
1567                         RETURN(0);
1568                 break;
1569         case OBD_LOG_CANCEL: /* remove this eventually - for 1.4.0 compat */
1570                 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
1571                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
1572                         RETURN(0);
1573                 rc = llog_origin_handle_cancel(req);
1574                 ldlm_callback_reply(req, rc);
1575                 RETURN(0);
1576         case OBD_QC_CALLBACK:
1577                 req_capsule_set(&req->rq_pill, &RQF_QC_CALLBACK);
1578                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_QC_CALLBACK_NET))
1579                         RETURN(0);
1580                 rc = target_handle_qc_callback(req);
1581                 ldlm_callback_reply(req, rc);
1582                 RETURN(0);
1583         case QUOTA_DQACQ:
1584         case QUOTA_DQREL:
1585                 /* reply in handler */
1586                 req_capsule_set(&req->rq_pill, &RQF_MDS_QUOTA_DQACQ);
1587                 rc = target_handle_dqacq_callback(req);
1588                 RETURN(0);
1589         case LLOG_ORIGIN_HANDLE_CREATE:
1590                 req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
1591                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1592                         RETURN(0);
1593                 rc = llog_origin_handle_create(req);
1594                 ldlm_callback_reply(req, rc);
1595                 RETURN(0);
1596         case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
1597                 req_capsule_set(&req->rq_pill,
1598                                 &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
1599                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1600                         RETURN(0);
1601                 rc = llog_origin_handle_next_block(req);
1602                 ldlm_callback_reply(req, rc);
1603                 RETURN(0);
1604         case LLOG_ORIGIN_HANDLE_READ_HEADER:
1605                 req_capsule_set(&req->rq_pill,
1606                                 &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER);
1607                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1608                         RETURN(0);
1609                 rc = llog_origin_handle_read_header(req);
1610                 ldlm_callback_reply(req, rc);
1611                 RETURN(0);
1612         case LLOG_ORIGIN_HANDLE_CLOSE:
1613                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1614                         RETURN(0);
1615                 rc = llog_origin_handle_close(req);
1616                 ldlm_callback_reply(req, rc);
1617                 RETURN(0);
1618         default:
1619                 CERROR("unknown opcode %u\n",
1620                        lustre_msg_get_opc(req->rq_reqmsg));
1621                 ldlm_callback_reply(req, -EPROTO);
1622                 RETURN(0);
1623         }
1624
1625         ns = req->rq_export->exp_obd->obd_namespace;
1626         LASSERT(ns != NULL);
1627
1628         req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1629
1630         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1631         if (dlm_req == NULL) {
1632                 ldlm_callback_reply(req, -EPROTO);
1633                 RETURN(0);
1634         }
1635
1636         lock = ldlm_handle2lock_ns(ns, &dlm_req->lock_handle[0]);
1637         if (!lock) {
1638                 CDEBUG(D_DLMTRACE, "callback on lock "LPX64" - lock "
1639                        "disappeared\n", dlm_req->lock_handle[0].cookie);
1640                 ldlm_callback_reply(req, -EINVAL);
1641                 RETURN(0);
1642         }
1643
1644         /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
1645         lock_res_and_lock(lock);
1646         lock->l_flags |= (dlm_req->lock_flags & LDLM_AST_FLAGS);
1647         if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1648                 /* If somebody cancels locks and cache is already droped,
1649                  * we can tell the server we have no lock. Otherwise, we
1650                  * should send cancel after dropping the cache. */
1651                 if ((lock->l_flags & LDLM_FL_CANCELING) &&
1652                     (lock->l_flags & LDLM_FL_BL_DONE)) {
1653                         LDLM_DEBUG(lock, "callback on lock "
1654                                    LPX64" - lock disappeared\n",
1655                                    dlm_req->lock_handle[0].cookie);
1656                         unlock_res_and_lock(lock);
1657                         LDLM_LOCK_PUT(lock);
1658                         ldlm_callback_reply(req, -EINVAL);
1659                         RETURN(0);
1660                 }
1661                 lock->l_flags |= LDLM_FL_BL_AST;
1662         }
1663         unlock_res_and_lock(lock);
1664
1665         /* We want the ost thread to get this reply so that it can respond
1666          * to ost requests (write cache writeback) that might be triggered
1667          * in the callback.
1668          *
1669          * But we'd also like to be able to indicate in the reply that we're
1670          * cancelling right now, because it's unused, or have an intent result
1671          * in the reply, so we might have to push the responsibility for sending
1672          * the reply down into the AST handlers, alas. */
1673
1674         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1675         case LDLM_BL_CALLBACK:
1676                 CDEBUG(D_INODE, "blocking ast\n");
1677                 req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
1678                 if (!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK))
1679                         ldlm_callback_reply(req, 0);
1680                 if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
1681                         ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
1682                 break;
1683         case LDLM_CP_CALLBACK:
1684                 CDEBUG(D_INODE, "completion ast\n");
1685                 req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
1686                 ldlm_callback_reply(req, 0);
1687                 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
1688                 break;
1689         case LDLM_GL_CALLBACK:
1690                 CDEBUG(D_INODE, "glimpse ast\n");
1691                 req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
1692                 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
1693                 break;
1694         default:
1695                 LBUG();                         /* checked above */
1696         }
1697
1698         RETURN(0);
1699 }
1700
1701 static int ldlm_cancel_handler(struct ptlrpc_request *req)
1702 {
1703         int rc;
1704         ENTRY;
1705
1706         /* Requests arrive in sender's byte order.  The ptlrpc service
1707          * handler has already checked and, if necessary, byte-swapped the
1708          * incoming request message body, but I am responsible for the
1709          * message buffers. */
1710
1711         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
1712
1713         if (req->rq_export == NULL) {
1714                 struct ldlm_request *dlm_req;
1715
1716                 CERROR("operation %d from %s with bad export cookie "LPU64"\n",
1717                        lustre_msg_get_opc(req->rq_reqmsg),
1718                        libcfs_id2str(req->rq_peer),
1719                        lustre_msg_get_handle(req->rq_reqmsg)->cookie);
1720
1721                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1722                 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1723                 if (dlm_req != NULL)
1724                         ldlm_lock_dump_handle(D_ERROR,
1725                                               &dlm_req->lock_handle[0]);
1726                 ldlm_callback_reply(req, -ENOTCONN);
1727                 RETURN(0);
1728         }
1729
1730         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1731
1732         /* XXX FIXME move this back to mds/handler.c, bug 249 */
1733         case LDLM_CANCEL:
1734                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
1735                 CDEBUG(D_INODE, "cancel\n");
1736                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL))
1737                         RETURN(0);
1738                 rc = ldlm_handle_cancel(req);
1739                 if (rc)
1740                         break;
1741                 RETURN(0);
1742         case OBD_LOG_CANCEL:
1743                 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
1744                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
1745                         RETURN(0);
1746                 rc = llog_origin_handle_cancel(req);
1747                 ldlm_callback_reply(req, rc);
1748                 RETURN(0);
1749         default:
1750                 CERROR("invalid opcode %d\n",
1751                        lustre_msg_get_opc(req->rq_reqmsg));
1752                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1753                 ldlm_callback_reply(req, -EINVAL);
1754         }
1755
1756         RETURN(0);
1757 }
1758
1759 void ldlm_revoke_export_locks(struct obd_export *exp)
1760 {
1761         struct list_head *locklist = &exp->exp_ldlm_data.led_held_locks;
1762         struct list_head  rpc_list;
1763         struct ldlm_lock *lock, *next;
1764
1765         ENTRY;
1766         INIT_LIST_HEAD(&rpc_list);
1767
1768         spin_lock(&exp->exp_ldlm_data.led_lock);
1769         list_for_each_entry_safe(lock, next, locklist, l_export_chain) {
1770                 lock_res_and_lock(lock);
1771
1772                 if (lock->l_req_mode != lock->l_granted_mode) {
1773                         unlock_res_and_lock(lock);
1774                         continue;
1775                 }
1776
1777                 LASSERT(lock->l_resource);
1778                 if (lock->l_resource->lr_type != LDLM_IBITS &&
1779                     lock->l_resource->lr_type != LDLM_PLAIN) {
1780                         unlock_res_and_lock(lock);
1781                         continue;
1782                 }
1783
1784                 if (lock->l_flags & LDLM_FL_AST_SENT) {
1785                         unlock_res_and_lock(lock);
1786                         continue;
1787                 }
1788
1789                 LASSERT(lock->l_blocking_ast);
1790                 LASSERT(!lock->l_blocking_lock);
1791
1792                 lock->l_flags |= LDLM_FL_AST_SENT;
1793                 list_move(&lock->l_export_chain, &rpc_list);
1794                 LDLM_LOCK_GET(lock);
1795
1796                 unlock_res_and_lock(lock);
1797         }
1798         spin_unlock(&exp->exp_ldlm_data.led_lock);
1799
1800         ldlm_run_ast_work(&rpc_list, LDLM_WORK_REVOKE_AST);
1801
1802         EXIT;
1803 }
1804
1805 #ifdef __KERNEL__
1806 static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp)
1807 {
1808         struct ldlm_bl_work_item *blwi = NULL;
1809         static unsigned int num_bl = 0;
1810
1811         spin_lock(&blp->blp_lock);
1812         /* process a request from the blp_list at least every blp_num_threads */
1813         if (!list_empty(&blp->blp_list) &&
1814             (list_empty(&blp->blp_prio_list) || num_bl == 0))
1815                 blwi = list_entry(blp->blp_list.next,
1816                                   struct ldlm_bl_work_item, blwi_entry);
1817         else
1818                 if (!list_empty(&blp->blp_prio_list))
1819                         blwi = list_entry(blp->blp_prio_list.next,
1820                                           struct ldlm_bl_work_item, blwi_entry);
1821
1822         if (blwi) {
1823                 if (++num_bl >= atomic_read(&blp->blp_num_threads))
1824                         num_bl = 0;
1825                 list_del(&blwi->blwi_entry);
1826         }
1827         spin_unlock(&blp->blp_lock);
1828
1829         return blwi;
1830 }
1831
1832 /* This only contains temporary data until the thread starts */
1833 struct ldlm_bl_thread_data {
1834         char                    bltd_name[CFS_CURPROC_COMM_MAX];
1835         struct ldlm_bl_pool     *bltd_blp;
1836         struct completion       bltd_comp;
1837         int                     bltd_num;
1838 };
1839
1840 static int ldlm_bl_thread_main(void *arg);
1841
1842 static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp)
1843 {
1844         struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
1845         int rc;
1846
1847         init_completion(&bltd.bltd_comp);
1848         rc = cfs_kernel_thread(ldlm_bl_thread_main, &bltd, 0);
1849         if (rc < 0) {
1850                 CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %d\n",
1851                        atomic_read(&blp->blp_num_threads), rc);
1852                 return rc;
1853         }
1854         wait_for_completion(&bltd.bltd_comp);
1855
1856         return 0;
1857 }
1858
1859 static int ldlm_bl_thread_main(void *arg)
1860 {
1861         struct ldlm_bl_pool *blp;
1862         ENTRY;
1863
1864         {
1865                 struct ldlm_bl_thread_data *bltd = arg;
1866
1867                 blp = bltd->bltd_blp;
1868
1869                 bltd->bltd_num = atomic_inc_return(&blp->blp_num_threads) - 1;
1870                 atomic_inc(&blp->blp_busy_threads);
1871
1872                 snprintf(bltd->bltd_name, sizeof(bltd->bltd_name) - 1,
1873                         "ldlm_bl_%02d", bltd->bltd_num);
1874                 cfs_daemonize(bltd->bltd_name);
1875
1876                 complete(&bltd->bltd_comp);
1877                 /* cannot use bltd after this, it is only on caller's stack */
1878         }
1879
1880         while (1) {
1881                 struct l_wait_info lwi = { 0 };
1882                 struct ldlm_bl_work_item *blwi = NULL;
1883
1884                 blwi = ldlm_bl_get_work(blp);
1885
1886                 if (blwi == NULL) {
1887                         int busy;
1888
1889                         atomic_dec(&blp->blp_busy_threads);
1890                         l_wait_event_exclusive(blp->blp_waitq,
1891                                          (blwi = ldlm_bl_get_work(blp)) != NULL,
1892                                          &lwi);
1893                         busy = atomic_inc_return(&blp->blp_busy_threads);
1894
1895                         if (blwi->blwi_ns == NULL)
1896                                 /* added by ldlm_cleanup() */
1897                                 break;
1898
1899                         /* Not fatal if racy and have a few too many threads */
1900                         if (unlikely(busy < blp->blp_max_threads &&
1901                                     busy >= atomic_read(&blp->blp_num_threads)))
1902                                 /* discard the return value, we tried */
1903                                 ldlm_bl_thread_start(blp);
1904                 } else {
1905                         if (blwi->blwi_ns == NULL)
1906                                 /* added by ldlm_cleanup() */
1907                                 break;
1908                 }
1909
1910                 if (blwi->blwi_count) {
1911                         /* The special case when we cancel locks in lru
1912                          * asynchronously, we pass the list of locks here.
1913                          * Thus lock is marked LDLM_FL_CANCELING, and already
1914                          * canceled locally. */
1915                         ldlm_cli_cancel_list(&blwi->blwi_head,
1916                                              blwi->blwi_count, NULL, 0);
1917                 } else {
1918                         ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
1919                                                 blwi->blwi_lock);
1920                 }
1921                 OBD_FREE(blwi, sizeof(*blwi));
1922         }
1923
1924         atomic_dec(&blp->blp_busy_threads);
1925         atomic_dec(&blp->blp_num_threads);
1926         complete(&blp->blp_comp);
1927         RETURN(0);
1928 }
1929
1930 #endif
1931
1932 static int ldlm_setup(void);
1933 static int ldlm_cleanup(int force);
1934
1935 int ldlm_get_ref(void)
1936 {
1937         int rc = 0;
1938         ENTRY;
1939         mutex_down(&ldlm_ref_sem);
1940         if (++ldlm_refcount == 1) {
1941                 rc = ldlm_setup();
1942                 if (rc)
1943                         ldlm_refcount--;
1944         }
1945         mutex_up(&ldlm_ref_sem);
1946
1947         RETURN(rc);
1948 }
1949
1950 void ldlm_put_ref(int force)
1951 {
1952         ENTRY;
1953         mutex_down(&ldlm_ref_sem);
1954         if (ldlm_refcount == 1) {
1955                 int rc = ldlm_cleanup(force);
1956                 if (rc)
1957                         CERROR("ldlm_cleanup failed: %d\n", rc);
1958                 else
1959                         ldlm_refcount--;
1960         } else {
1961                 ldlm_refcount--;
1962         }
1963         mutex_up(&ldlm_ref_sem);
1964
1965         EXIT;
1966 }
1967
1968 static int ldlm_setup(void)
1969 {
1970         struct ldlm_bl_pool *blp;
1971         int rc = 0;
1972         int ldlm_min_threads = LDLM_THREADS_AUTO_MIN;
1973         int ldlm_max_threads = LDLM_THREADS_AUTO_MAX;
1974 #ifdef __KERNEL__
1975         int i;
1976 #endif
1977         ENTRY;
1978
1979         if (ldlm_state != NULL)
1980                 RETURN(-EALREADY);
1981
1982         OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
1983         if (ldlm_state == NULL)
1984                 RETURN(-ENOMEM);
1985
1986 #ifdef LPROCFS
1987         rc = ldlm_proc_setup();
1988         if (rc != 0)
1989                 GOTO(out_free, rc);
1990 #endif
1991
1992 #ifdef __KERNEL__
1993         if (ldlm_num_threads) {
1994                 /* If ldlm_num_threads is set, it is the min and the max. */
1995                 if (ldlm_num_threads > LDLM_THREADS_AUTO_MAX)
1996                         ldlm_num_threads = LDLM_THREADS_AUTO_MAX;
1997                 if (ldlm_num_threads < LDLM_THREADS_AUTO_MIN)
1998                         ldlm_num_threads = LDLM_THREADS_AUTO_MIN;
1999                 ldlm_min_threads = ldlm_max_threads = ldlm_num_threads;
2000         }
2001 #endif
2002
2003         ldlm_state->ldlm_cb_service =
2004                 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2005                                 LDLM_MAXREPSIZE, LDLM_CB_REQUEST_PORTAL,
2006                                 LDLM_CB_REPLY_PORTAL, ldlm_timeout * 900,
2007                                 ldlm_callback_handler, "ldlm_cbd",
2008                                 ldlm_svc_proc_dir, NULL,
2009                                 ldlm_min_threads, ldlm_max_threads,
2010                                 "ldlm_cb",
2011                                 LCT_MD_THREAD|LCT_DT_THREAD);
2012
2013         if (!ldlm_state->ldlm_cb_service) {
2014                 CERROR("failed to start service\n");
2015                 GOTO(out_proc, rc = -ENOMEM);
2016         }
2017
2018         ldlm_state->ldlm_cancel_service =
2019                 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2020                                 LDLM_MAXREPSIZE, LDLM_CANCEL_REQUEST_PORTAL,
2021                                 LDLM_CANCEL_REPLY_PORTAL, ldlm_timeout * 6000,
2022                                 ldlm_cancel_handler, "ldlm_canceld",
2023                                 ldlm_svc_proc_dir, NULL,
2024                                 ldlm_min_threads, ldlm_max_threads,
2025                                 "ldlm_cn",
2026                                 LCT_MD_THREAD|LCT_DT_THREAD|LCT_CL_THREAD);
2027
2028         if (!ldlm_state->ldlm_cancel_service) {
2029                 CERROR("failed to start service\n");
2030                 GOTO(out_proc, rc = -ENOMEM);
2031         }
2032
2033         OBD_ALLOC(blp, sizeof(*blp));
2034         if (blp == NULL)
2035                 GOTO(out_proc, rc = -ENOMEM);
2036         ldlm_state->ldlm_bl_pool = blp;
2037
2038         spin_lock_init(&blp->blp_lock);
2039         CFS_INIT_LIST_HEAD(&blp->blp_list);
2040         CFS_INIT_LIST_HEAD(&blp->blp_prio_list);
2041         cfs_waitq_init(&blp->blp_waitq);
2042         atomic_set(&blp->blp_num_threads, 0);
2043         atomic_set(&blp->blp_busy_threads, 0);
2044         blp->blp_min_threads = ldlm_min_threads;
2045         blp->blp_max_threads = ldlm_max_threads;
2046
2047 #ifdef __KERNEL__
2048         for (i = 0; i < blp->blp_min_threads; i++) {
2049                 rc = ldlm_bl_thread_start(blp);
2050                 if (rc < 0)
2051                         GOTO(out_thread, rc);
2052         }
2053
2054         rc = ptlrpc_start_threads(NULL, ldlm_state->ldlm_cancel_service);
2055         if (rc)
2056                 GOTO(out_thread, rc);
2057
2058         rc = ptlrpc_start_threads(NULL, ldlm_state->ldlm_cb_service);
2059         if (rc)
2060                 GOTO(out_thread, rc);
2061
2062         CFS_INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
2063         expired_lock_thread.elt_state = ELT_STOPPED;
2064         cfs_waitq_init(&expired_lock_thread.elt_waitq);
2065
2066         CFS_INIT_LIST_HEAD(&waiting_locks_list);
2067         spin_lock_init(&waiting_locks_spinlock);
2068         cfs_timer_init(&waiting_locks_timer, waiting_locks_callback, 0);
2069
2070         rc = cfs_kernel_thread(expired_lock_main, NULL, CLONE_VM | CLONE_FILES);
2071         if (rc < 0) {
2072                 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
2073                 GOTO(out_thread, rc);
2074         }
2075
2076         wait_event(expired_lock_thread.elt_waitq,
2077                    expired_lock_thread.elt_state == ELT_READY);
2078 #endif
2079
2080 #ifdef __KERNEL__
2081         rc = ldlm_pools_init();
2082         if (rc)
2083                 GOTO(out_thread, rc);
2084 #endif
2085         RETURN(0);
2086
2087 #ifdef __KERNEL__
2088  out_thread:
2089         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2090         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2091 #endif
2092
2093  out_proc:
2094 #ifdef LPROCFS
2095         ldlm_proc_cleanup();
2096  out_free:
2097 #endif
2098         OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2099         ldlm_state = NULL;
2100         return rc;
2101 }
2102
2103 static int ldlm_cleanup(int force)
2104 {
2105 #ifdef __KERNEL__
2106         struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
2107 #endif
2108         ENTRY;
2109
2110         if (!list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) ||
2111             !list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) {
2112                 CERROR("ldlm still has namespaces; clean these up first.\n");
2113                 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
2114                 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
2115                 RETURN(-EBUSY);
2116         }
2117
2118 #ifdef __KERNEL__
2119         ldlm_pools_fini();
2120 #endif
2121
2122 #ifdef __KERNEL__
2123         while (atomic_read(&blp->blp_num_threads) > 0) {
2124                 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
2125
2126                 init_completion(&blp->blp_comp);
2127
2128                 spin_lock(&blp->blp_lock);
2129                 list_add_tail(&blwi.blwi_entry, &blp->blp_list);
2130                 cfs_waitq_signal(&blp->blp_waitq);
2131                 spin_unlock(&blp->blp_lock);
2132
2133                 wait_for_completion(&blp->blp_comp);
2134         }
2135         OBD_FREE(blp, sizeof(*blp));
2136
2137         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2138         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2139         ldlm_proc_cleanup();
2140
2141         expired_lock_thread.elt_state = ELT_TERMINATE;
2142         cfs_waitq_signal(&expired_lock_thread.elt_waitq);
2143         wait_event(expired_lock_thread.elt_waitq,
2144                    expired_lock_thread.elt_state == ELT_STOPPED);
2145 #else
2146         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2147         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2148 #endif
2149
2150         OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2151         ldlm_state = NULL;
2152
2153         RETURN(0);
2154 }
2155
2156 int __init ldlm_init(void)
2157 {
2158         init_mutex(&ldlm_ref_sem);
2159         init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER));
2160         init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
2161         ldlm_resource_slab = cfs_mem_cache_create("ldlm_resources",
2162                                                sizeof(struct ldlm_resource), 0,
2163                                                SLAB_HWCACHE_ALIGN);
2164         if (ldlm_resource_slab == NULL)
2165                 return -ENOMEM;
2166
2167         ldlm_lock_slab = cfs_mem_cache_create("ldlm_locks",
2168                                            sizeof(struct ldlm_lock), 0,
2169                                            SLAB_HWCACHE_ALIGN);
2170         if (ldlm_lock_slab == NULL) {
2171                 cfs_mem_cache_destroy(ldlm_resource_slab);
2172                 return -ENOMEM;
2173         }
2174
2175         return 0;
2176 }
2177
2178 void __exit ldlm_exit(void)
2179 {
2180         int rc;
2181         if (ldlm_refcount)
2182                 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
2183         rc = cfs_mem_cache_destroy(ldlm_resource_slab);
2184         LASSERTF(rc == 0, "couldn't free ldlm resource slab\n");
2185         rc = cfs_mem_cache_destroy(ldlm_lock_slab);
2186         LASSERTF(rc == 0, "couldn't free ldlm lock slab\n");
2187 }
2188
2189 /* ldlm_extent.c */
2190 EXPORT_SYMBOL(ldlm_extent_shift_kms);
2191
2192 /* ldlm_lock.c */
2193 EXPORT_SYMBOL(ldlm_get_processing_policy);
2194 EXPORT_SYMBOL(ldlm_lock2desc);
2195 EXPORT_SYMBOL(ldlm_register_intent);
2196 EXPORT_SYMBOL(ldlm_lockname);
2197 EXPORT_SYMBOL(ldlm_typename);
2198 EXPORT_SYMBOL(ldlm_lock2handle);
2199 EXPORT_SYMBOL(__ldlm_handle2lock);
2200 EXPORT_SYMBOL(ldlm_lock_get);
2201 EXPORT_SYMBOL(ldlm_lock_put);
2202 EXPORT_SYMBOL(ldlm_lock_match);
2203 EXPORT_SYMBOL(ldlm_lock_cancel);
2204 EXPORT_SYMBOL(ldlm_lock_addref);
2205 EXPORT_SYMBOL(ldlm_lock_decref);
2206 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
2207 EXPORT_SYMBOL(ldlm_lock_change_resource);
2208 EXPORT_SYMBOL(ldlm_lock_set_data);
2209 EXPORT_SYMBOL(ldlm_it2str);
2210 EXPORT_SYMBOL(ldlm_lock_dump);
2211 EXPORT_SYMBOL(ldlm_lock_dump_handle);
2212 EXPORT_SYMBOL(ldlm_cancel_locks_for_export);
2213 EXPORT_SYMBOL(ldlm_reprocess_all_ns);
2214 EXPORT_SYMBOL(ldlm_lock_allow_match);
2215
2216 /* ldlm_request.c */
2217 EXPORT_SYMBOL(ldlm_completion_ast);
2218 EXPORT_SYMBOL(ldlm_blocking_ast);
2219 EXPORT_SYMBOL(ldlm_glimpse_ast);
2220 EXPORT_SYMBOL(ldlm_expired_completion_wait);
2221 EXPORT_SYMBOL(ldlm_prep_enqueue_req);
2222 EXPORT_SYMBOL(ldlm_prep_elc_req);
2223 EXPORT_SYMBOL(ldlm_cli_convert);
2224 EXPORT_SYMBOL(ldlm_cli_enqueue);
2225 EXPORT_SYMBOL(ldlm_cli_enqueue_fini);
2226 EXPORT_SYMBOL(ldlm_cli_enqueue_local);
2227 EXPORT_SYMBOL(ldlm_cli_cancel);
2228 EXPORT_SYMBOL(ldlm_cli_cancel_unused);
2229 EXPORT_SYMBOL(ldlm_cli_cancel_unused_resource);
2230 EXPORT_SYMBOL(ldlm_cli_cancel_req);
2231 EXPORT_SYMBOL(ldlm_cli_join_lru);
2232 EXPORT_SYMBOL(ldlm_replay_locks);
2233 EXPORT_SYMBOL(ldlm_resource_foreach);
2234 EXPORT_SYMBOL(ldlm_namespace_foreach);
2235 EXPORT_SYMBOL(ldlm_namespace_foreach_res);
2236 EXPORT_SYMBOL(ldlm_resource_iterate);
2237 EXPORT_SYMBOL(ldlm_cancel_resource_local);
2238 EXPORT_SYMBOL(ldlm_cli_cancel_list);
2239
2240 /* ldlm_lockd.c */
2241 EXPORT_SYMBOL(ldlm_server_blocking_ast);
2242 EXPORT_SYMBOL(ldlm_server_completion_ast);
2243 EXPORT_SYMBOL(ldlm_server_glimpse_ast);
2244 EXPORT_SYMBOL(ldlm_handle_enqueue);
2245 EXPORT_SYMBOL(ldlm_handle_enqueue0);
2246 EXPORT_SYMBOL(ldlm_handle_cancel);
2247 EXPORT_SYMBOL(ldlm_request_cancel);
2248 EXPORT_SYMBOL(ldlm_handle_convert);
2249 EXPORT_SYMBOL(ldlm_handle_convert0);
2250 EXPORT_SYMBOL(ldlm_del_waiting_lock);
2251 EXPORT_SYMBOL(ldlm_get_ref);
2252 EXPORT_SYMBOL(ldlm_put_ref);
2253 EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
2254 EXPORT_SYMBOL(ldlm_revoke_export_locks);
2255
2256 /* ldlm_resource.c */
2257 EXPORT_SYMBOL(ldlm_namespace_new);
2258 EXPORT_SYMBOL(ldlm_namespace_cleanup);
2259 EXPORT_SYMBOL(ldlm_namespace_free);
2260 EXPORT_SYMBOL(ldlm_namespace_dump);
2261 EXPORT_SYMBOL(ldlm_dump_all_namespaces);
2262 EXPORT_SYMBOL(ldlm_resource_get);
2263 EXPORT_SYMBOL(ldlm_resource_putref);
2264 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
2265
2266 /* ldlm_lib.c */
2267 EXPORT_SYMBOL(client_import_add_conn);
2268 EXPORT_SYMBOL(client_import_del_conn);
2269 EXPORT_SYMBOL(client_obd_setup);
2270 EXPORT_SYMBOL(client_obd_cleanup);
2271 EXPORT_SYMBOL(client_connect_import);
2272 EXPORT_SYMBOL(client_disconnect_export);
2273 EXPORT_SYMBOL(target_start_recovery_thread);
2274 EXPORT_SYMBOL(target_stop_recovery_thread);
2275 EXPORT_SYMBOL(target_handle_connect);
2276 EXPORT_SYMBOL(target_cleanup_recovery);
2277 EXPORT_SYMBOL(target_destroy_export);
2278 EXPORT_SYMBOL(target_cancel_recovery_timer);
2279 EXPORT_SYMBOL(target_send_reply);
2280 EXPORT_SYMBOL(target_queue_recovery_request);
2281 EXPORT_SYMBOL(target_handle_ping);
2282 EXPORT_SYMBOL(target_pack_pool_reply);
2283 EXPORT_SYMBOL(target_handle_disconnect);
2284
2285 /* l_lock.c */
2286 EXPORT_SYMBOL(lock_res_and_lock);
2287 EXPORT_SYMBOL(unlock_res_and_lock);
2288