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  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/ldlm/ldlm_lockd.c
  37  *
  38  * Author: Peter Braam <braam@clusterfs.com>
  39  * Author: Phil Schwan <phil@clusterfs.com>
  40  */
  41
  42 #ifndef EXPORT_SYMTAB
  43 # define EXPORT_SYMTAB
  44 #endif
  45 #define DEBUG_SUBSYSTEM S_LDLM
  46
  47 #ifdef __KERNEL__
  48 # include <libcfs/libcfs.h>
  49 #else
  50 # include <liblustre.h>
  51 #endif
  52
  53 #include <lustre_dlm.h>
  54 #include <obd_class.h>
  55 #include <libcfs/list.h>
  56 #include "ldlm_internal.h"
  57
  58 #ifdef __KERNEL__
  59 static int ldlm_num_threads;
  60 CFS_MODULE_PARM(ldlm_num_threads, "i", int, 0444,
  61                 "number of DLM service threads to start");
  62 #endif
  63
  64 extern cfs_mem_cache_t *ldlm_resource_slab;
  65 extern cfs_mem_cache_t *ldlm_lock_slab;
  66 static struct semaphore ldlm_ref_sem;
  67 static int ldlm_refcount;
  68
  69 /* LDLM state */
  70
  71 static struct ldlm_state *ldlm_state;
  72
  73 inline cfs_time_t round_timeout(cfs_time_t timeout)
  74 {
  75         return cfs_time_seconds((int)cfs_duration_sec(cfs_time_sub(timeout, 0)) + 1);
  76 }
  77
  78 /* timeout for initial callback (AST) reply (bz10399) */
  79 static inline unsigned int ldlm_get_rq_timeout(void)
  80 {
  81         /* Non-AT value */
  82         unsigned int timeout = min(ldlm_timeout, obd_timeout / 3);
  83
  84         return timeout < 1 ? 1 : timeout;
  85 }
  86
  87 #ifdef __KERNEL__
  88 /* w_l_spinlock protects both waiting_locks_list and expired_lock_thread */
  89 static spinlock_t waiting_locks_spinlock;   /* BH lock (timer) */
  90 static struct list_head waiting_locks_list;
  91 static cfs_timer_t waiting_locks_timer;
  92
  93 static struct expired_lock_thread {
  94         cfs_waitq_t               elt_waitq;
  95         int                       elt_state;
  96         int                       elt_dump;
  97         struct list_head          elt_expired_locks;
  98 } expired_lock_thread;
  99 #endif
 100
 101 #define ELT_STOPPED   0
 102 #define ELT_READY     1
 103 #define ELT_TERMINATE 2
 104
 105 struct ldlm_bl_pool {
 106         spinlock_t              blp_lock;
 107
 108         /*
 109          * blp_prio_list is used for callbacks that should be handled
 110          * as a priority. It is used for LDLM_FL_DISCARD_DATA requests.
 111          * see bug 13843
 112          */
 113         struct list_head        blp_prio_list;
 114
 115         /*
 116          * blp_list is used for all other callbacks which are likely
 117          * to take longer to process.
 118          */
 119         struct list_head        blp_list;
 120
 121         cfs_waitq_t             blp_waitq;
 122         struct completion       blp_comp;
 123         atomic_t                blp_num_threads;
 124         atomic_t                blp_busy_threads;
 125         int                     blp_min_threads;
 126         int                     blp_max_threads;
 127 };
 128
 129 struct ldlm_bl_work_item {
 130         struct list_head        blwi_entry;
 131         struct ldlm_namespace   *blwi_ns;
 132         struct ldlm_lock_desc   blwi_ld;
 133         struct ldlm_lock        *blwi_lock;
 134         struct list_head        blwi_head;
 135         int                     blwi_count;
 136 };
 137
 138 #ifdef __KERNEL__
 139
 140 static inline int have_expired_locks(void)
 141 {
 142         int need_to_run;
 143
 144         ENTRY;
 145         spin_lock_bh(&waiting_locks_spinlock);
 146         need_to_run = !list_empty(&expired_lock_thread.elt_expired_locks);
 147         spin_unlock_bh(&waiting_locks_spinlock);
 148
 149         RETURN(need_to_run);
 150 }
 151
 152 static int expired_lock_main(void *arg)
 153 {
 154         struct list_head *expired = &expired_lock_thread.elt_expired_locks;
 155         struct l_wait_info lwi = { 0 };
 156         int do_dump;
 157
 158         ENTRY;
 159         cfs_daemonize("ldlm_elt");
 160
 161         expired_lock_thread.elt_state = ELT_READY;
 162         cfs_waitq_signal(&expired_lock_thread.elt_waitq);
 163
 164         while (1) {
 165                 l_wait_event(expired_lock_thread.elt_waitq,
 166                              have_expired_locks() ||
 167                              expired_lock_thread.elt_state == ELT_TERMINATE,
 168                              &lwi);
 169
 170                 spin_lock_bh(&waiting_locks_spinlock);
 171                 if (expired_lock_thread.elt_dump) {
 172                         spin_unlock_bh(&waiting_locks_spinlock);
 173
 174                         /* from waiting_locks_callback, but not in timer */
 175                         libcfs_debug_dumplog();
 176                         libcfs_run_lbug_upcall(__FILE__,
 177                                                 "waiting_locks_callback",
 178                                                 expired_lock_thread.elt_dump);
 179
 180                         spin_lock_bh(&waiting_locks_spinlock);
 181                         expired_lock_thread.elt_dump = 0;
 182                 }
 183
 184                 do_dump = 0;
 185
 186                 while (!list_empty(expired)) {
 187                         struct obd_export *export;
 188                         struct ldlm_lock *lock;
 189
 190                         lock = list_entry(expired->next, struct ldlm_lock,
 191                                           l_pending_chain);
 192                         if ((void *)lock < LP_POISON + CFS_PAGE_SIZE &&
 193                             (void *)lock >= LP_POISON) {
 194                                 spin_unlock_bh(&waiting_locks_spinlock);
 195                                 CERROR("free lock on elt list %p\n", lock);
 196                                 LBUG();
 197                         }
 198                         list_del_init(&lock->l_pending_chain);
 199                         if ((void *)lock->l_export < LP_POISON + CFS_PAGE_SIZE &&
 200                             (void *)lock->l_export >= LP_POISON) {
 201                                 CERROR("lock with free export on elt list %p\n",
 202                                        lock->l_export);
 203                                 lock->l_export = NULL;
 204                                 LDLM_ERROR(lock, "free export");
 205                                 continue;
 206                         }
 207                         export = class_export_get(lock->l_export);
 208                         spin_unlock_bh(&waiting_locks_spinlock);
 209
 210                         do_dump++;
 211                         class_fail_export(export);
 212                         class_export_put(export);
 213                         spin_lock_bh(&waiting_locks_spinlock);
 214                 }
 215                 spin_unlock_bh(&waiting_locks_spinlock);
 216
 217                 if (do_dump && obd_dump_on_eviction) {
 218                         CERROR("dump the log upon eviction\n");
 219                         libcfs_debug_dumplog();
 220                 }
 221
 222                 if (expired_lock_thread.elt_state == ELT_TERMINATE)
 223                         break;
 224         }
 225
 226         expired_lock_thread.elt_state = ELT_STOPPED;
 227         cfs_waitq_signal(&expired_lock_thread.elt_waitq);
 228         RETURN(0);
 229 }
 230
 231 static int ldlm_add_waiting_lock(struct ldlm_lock *lock);
 232
 233 /* This is called from within a timer interrupt and cannot schedule */
 234 static void waiting_locks_callback(unsigned long unused)
 235 {
 236         struct ldlm_lock *lock, *last = NULL;
 237
 238 repeat:
 239         spin_lock_bh(&waiting_locks_spinlock);
 240         while (!list_empty(&waiting_locks_list)) {
 241                 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
 242                                   l_pending_chain);
 243
 244                 if (cfs_time_after(lock->l_callback_timeout, cfs_time_current()) ||
 245                     (lock->l_req_mode == LCK_GROUP))
 246                         break;
 247
 248                 if (ptlrpc_check_suspend()) {
 249                         /* there is a case when we talk to one mds, holding
 250                          * lock from another mds. this way we easily can get
 251                          * here, if second mds is being recovered. so, we
 252                          * suspend timeouts. bug 6019 */
 253
 254                         LDLM_ERROR(lock, "recharge timeout: %s@%s nid %s ",
 255                                    lock->l_export->exp_client_uuid.uuid,
 256                                    lock->l_export->exp_connection->c_remote_uuid.uuid,
 257                                    libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
 258
 259                         list_del_init(&lock->l_pending_chain);
 260                         spin_unlock_bh(&waiting_locks_spinlock);
 261                         ldlm_add_waiting_lock(lock);
 262                         goto repeat;
 263                 }
 264
 265                 /* if timeout overlaps the activation time of suspended timeouts
 266                  * then extend it to give a chance for client to reconnect */
 267                 if (cfs_time_before(cfs_time_sub(lock->l_callback_timeout,
 268                                                  cfs_time_seconds(obd_timeout)/2),
 269                                     ptlrpc_suspend_wakeup_time())) {
 270                         LDLM_ERROR(lock, "extend timeout due to recovery: %s@%s nid %s ",
 271                                    lock->l_export->exp_client_uuid.uuid,
 272                                    lock->l_export->exp_connection->c_remote_uuid.uuid,
 273                                    libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
 274
 275                         list_del_init(&lock->l_pending_chain);
 276                         spin_unlock_bh(&waiting_locks_spinlock);
 277                         ldlm_add_waiting_lock(lock);
 278                         goto repeat;
 279                 }
 280
 281                 LDLM_ERROR(lock, "lock callback timer expired after %lds: "
 282                            "evicting client at %s ",
 283                            cfs_time_current_sec()- lock->l_enqueued_time.tv_sec,
 284                            libcfs_nid2str(
 285                                    lock->l_export->exp_connection->c_peer.nid));
 286
 287                 last = lock;
 288
 289                 list_del(&lock->l_pending_chain);
 290                 list_add(&lock->l_pending_chain,
 291                          &expired_lock_thread.elt_expired_locks);
 292         }
 293
 294         if (!list_empty(&expired_lock_thread.elt_expired_locks)) {
 295                 if (obd_dump_on_timeout)
 296                         expired_lock_thread.elt_dump = __LINE__;
 297
 298                 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
 299         }
 300
 301         /*
 302          * Make sure the timer will fire again if we have any locks
 303          * left.
 304          */
 305         if (!list_empty(&waiting_locks_list)) {
 306                 cfs_time_t timeout_rounded;
 307                 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
 308                                   l_pending_chain);
 309                 timeout_rounded = (cfs_time_t)round_timeout(lock->l_callback_timeout);
 310                 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
 311         }
 312         spin_unlock_bh(&waiting_locks_spinlock);
 313 }
 314
 315 /*
 316  * Indicate that we're waiting for a client to call us back cancelling a given
 317  * lock.  We add it to the pending-callback chain, and schedule the lock-timeout
 318  * timer to fire appropriately.  (We round up to the next second, to avoid
 319  * floods of timer firings during periods of high lock contention and traffic).
 320  *
 321  * Called with the namespace lock held.
 322  */
 323 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock)
 324 {
 325         int timeout;
 326         cfs_time_t timeout_rounded;
 327
 328         if (!list_empty(&lock->l_pending_chain))
 329                 return 0;
 330
 331         timeout = ldlm_get_enq_timeout(lock);
 332
 333         lock->l_callback_timeout = cfs_time_shift(timeout);
 334
 335         timeout_rounded = round_timeout(lock->l_callback_timeout);
 336
 337         if (cfs_time_before(timeout_rounded,
 338                             cfs_timer_deadline(&waiting_locks_timer)) ||
 339             !cfs_timer_is_armed(&waiting_locks_timer)) {
 340                 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
 341         }
 342         /* if the new lock has a shorter timeout than something earlier on
 343            the list, we'll wait the longer amount of time; no big deal. */
 344         list_add_tail(&lock->l_pending_chain, &waiting_locks_list); /* FIFO */
 345         return 1;
 346 }
 347
 348 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
 349 {
 350         int ret;
 351
 352         LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK));
 353
 354         spin_lock_bh(&waiting_locks_spinlock);
 355         if (lock->l_destroyed) {
 356                 static cfs_time_t next;
 357                 spin_unlock_bh(&waiting_locks_spinlock);
 358                 LDLM_ERROR(lock, "not waiting on destroyed lock (bug 5653)");
 359                 if (cfs_time_after(cfs_time_current(), next)) {
 360                         next = cfs_time_shift(14400);
 361                         libcfs_debug_dumpstack(NULL);
 362                 }
 363                 return 0;
 364         }
 365
 366         ret = __ldlm_add_waiting_lock(lock);
 367         spin_unlock_bh(&waiting_locks_spinlock);
 368
 369         LDLM_DEBUG(lock, "%sadding to wait list",
 370                    ret == 0 ? "not re-" : "");
 371         return ret;
 372 }
 373
 374 /*
 375  * Remove a lock from the pending list, likely because it had its cancellation
 376  * callback arrive without incident.  This adjusts the lock-timeout timer if
 377  * needed.  Returns 0 if the lock wasn't pending after all, 1 if it was.
 378  *
 379  * Called with namespace lock held.
 380  */
 381 int __ldlm_del_waiting_lock(struct ldlm_lock *lock)
 382 {
 383         struct list_head *list_next;
 384
 385         if (list_empty(&lock->l_pending_chain))
 386                 return 0;
 387
 388         list_next = lock->l_pending_chain.next;
 389         if (lock->l_pending_chain.prev == &waiting_locks_list) {
 390                 /* Removing the head of the list, adjust timer. */
 391                 if (list_next == &waiting_locks_list) {
 392                         /* No more, just cancel. */
 393                         cfs_timer_disarm(&waiting_locks_timer);
 394                 } else {
 395                         struct ldlm_lock *next;
 396                         next = list_entry(list_next, struct ldlm_lock,
 397                                           l_pending_chain);
 398                         cfs_timer_arm(&waiting_locks_timer,
 399                                       round_timeout(next->l_callback_timeout));
 400                 }
 401         }
 402         list_del_init(&lock->l_pending_chain);
 403
 404         return 1;
 405 }
 406
 407 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
 408 {
 409         int ret;
 410
 411         if (lock->l_export == NULL) {
 412                 /* We don't have a "waiting locks list" on clients. */
 413                 LDLM_DEBUG(lock, "client lock: no-op");
 414                 return 0;
 415         }
 416
 417         spin_lock_bh(&waiting_locks_spinlock);
 418         ret = __ldlm_del_waiting_lock(lock);
 419         spin_unlock_bh(&waiting_locks_spinlock);
 420
 421         LDLM_DEBUG(lock, "%s", ret == 0 ? "wasn't waiting" : "removed");
 422         return ret;
 423 }
 424
 425 /*
 426  * Prolong the lock
 427  *
 428  * Called with namespace lock held.
 429  */
 430 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock)
 431 {
 432         if (lock->l_export == NULL) {
 433                 /* We don't have a "waiting locks list" on clients. */
 434                 LDLM_DEBUG(lock, "client lock: no-op");
 435                 return 0;
 436         }
 437
 438         spin_lock_bh(&waiting_locks_spinlock);
 439
 440         if (list_empty(&lock->l_pending_chain)) {
 441                 spin_unlock_bh(&waiting_locks_spinlock);
 442                 LDLM_DEBUG(lock, "wasn't waiting");
 443                 return 0;
 444         }
 445
 446         __ldlm_del_waiting_lock(lock);
 447         __ldlm_add_waiting_lock(lock);
 448         spin_unlock_bh(&waiting_locks_spinlock);
 449
 450         LDLM_DEBUG(lock, "refreshed");
 451         return 1;
 452 }
 453
 454 #else /* !__KERNEL__ */
 455
 456 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
 457 {
 458         LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK));
 459         RETURN(1);
 460 }
 461
 462 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
 463 {
 464         RETURN(0);
 465 }
 466
 467 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock)
 468 {
 469         RETURN(0);
 470 }
 471 #endif /* __KERNEL__ */
 472
 473 static void ldlm_failed_ast(struct ldlm_lock *lock, int rc,
 474                             const char *ast_type)
 475 {
 476         struct ptlrpc_connection *conn = lock->l_export->exp_connection;
 477         char                     *str = libcfs_nid2str(conn->c_peer.nid);
 478
 479         LCONSOLE_ERROR_MSG(0x138, "A client on nid %s was evicted from "
 480                            "service %s.\n", str,
 481                            lock->l_export->exp_obd->obd_name);
 482
 483         LCONSOLE_ERROR_MSG(0x012, "Lock %s callback to %s timed out for "
 484                            "resource %d\n", ast_type,
 485                            obd_export_nid2str(lock->l_export), rc);
 486
 487         if (obd_dump_on_timeout)
 488                 libcfs_debug_dumplog();
 489 #ifdef __KERNEL__
 490         spin_lock_bh(&waiting_locks_spinlock);
 491         list_add(&lock->l_pending_chain, &expired_lock_thread.elt_expired_locks);
 492         cfs_waitq_signal(&expired_lock_thread.elt_waitq);
 493         spin_unlock_bh(&waiting_locks_spinlock);
 494 #else
 495         class_fail_export(lock->l_export);
 496 #endif
 497 }
 498
 499 static int ldlm_handle_ast_error(struct ldlm_lock *lock,
 500                                  struct ptlrpc_request *req, int rc,
 501                                  const char *ast_type)
 502 {
 503         lnet_process_id_t peer = req->rq_import->imp_connection->c_peer;
 504
 505         if (rc == -ETIMEDOUT || rc == -EINTR || rc == -ENOTCONN) {
 506                 LASSERT(lock->l_export);
 507                 if (lock->l_export->exp_libclient) {
 508                         LDLM_DEBUG(lock, "%s AST to liblustre client (nid %s)"
 509                                    " timeout, just cancelling lock", ast_type,
 510                                    libcfs_nid2str(peer.nid));
 511                         ldlm_lock_cancel(lock);
 512                         rc = -ERESTART;
 513                 } else if (lock->l_flags & LDLM_FL_CANCEL) {
 514                         LDLM_DEBUG(lock, "%s AST timeout from nid %s, but "
 515                                    "cancel was received (AST reply lost?)",
 516                                    ast_type, libcfs_nid2str(peer.nid));
 517                         ldlm_lock_cancel(lock);
 518                         rc = -ERESTART;
 519                 } else {
 520                         ldlm_del_waiting_lock(lock);
 521                         ldlm_failed_ast(lock, rc, ast_type);
 522                 }
 523         } else if (rc) {
 524                 if (rc == -EINVAL)
 525                         LDLM_DEBUG(lock, "client (nid %s) returned %d"
 526                                " from %s AST - normal race",
 527                                libcfs_nid2str(peer.nid),
 528                                req->rq_repmsg ?
 529                                lustre_msg_get_status(req->rq_repmsg) : -1,
 530                                ast_type);
 531                 else
 532                         LDLM_ERROR(lock, "client (nid %s) returned %d "
 533                                    "from %s AST", libcfs_nid2str(peer.nid),
 534                                    (req->rq_repmsg != NULL) ?
 535                                    lustre_msg_get_status(req->rq_repmsg) : 0,
 536                                    ast_type);
 537                 ldlm_lock_cancel(lock);
 538                 /* Server-side AST functions are called from ldlm_reprocess_all,
 539                  * which needs to be told to please restart its reprocessing. */
 540                 rc = -ERESTART;
 541         }
 542
 543         return rc;
 544 }
 545
 546 static int ldlm_cb_interpret(struct ptlrpc_request *req, void *data, int rc)
 547 {
 548         struct ldlm_cb_set_arg *arg;
 549         struct ldlm_lock *lock;
 550         ENTRY;
 551
 552         LASSERT(data != NULL);
 553
 554         arg = req->rq_async_args.pointer_arg[0];
 555         lock = req->rq_async_args.pointer_arg[1];
 556         LASSERT(lock != NULL);
 557         if (rc != 0) {
 558                 /* If client canceled the lock but the cancel has not
 559                  * been recieved yet, we need to update lvbo to have the
 560                  * proper attributes cached. */
 561                 if (rc == -EINVAL && arg->type == LDLM_BL_CALLBACK)
 562                         ldlm_res_lvbo_update(lock->l_resource, NULL,
 563                                              0, 1);
 564                 rc = ldlm_handle_ast_error(lock, req, rc,
 565                                            arg->type == LDLM_BL_CALLBACK
 566                                            ? "blocking" : "completion");
 567         }
 568
 569         LDLM_LOCK_PUT(lock);
 570
 571         if (rc == -ERESTART)
 572                 atomic_set(&arg->restart, 1);
 573
 574         RETURN(0);
 575 }
 576
 577 static inline int ldlm_bl_and_cp_ast_fini(struct ptlrpc_request *req,
 578                                           struct ldlm_cb_set_arg *arg,
 579                                           struct ldlm_lock *lock,
 580                                           int instant_cancel)
 581 {
 582         int rc = 0;
 583         ENTRY;
 584
 585         if (unlikely(instant_cancel)) {
 586                 rc = ptl_send_rpc(req, 1);
 587                 ptlrpc_req_finished(req);
 588                 if (rc == 0)
 589                         /* If we cancelled the lock, we need to restart
 590                          * ldlm_reprocess_queue */
 591                         atomic_set(&arg->restart, 1);
 592         } else {
 593                 LDLM_LOCK_GET(lock);
 594                 ptlrpc_set_add_req(arg->set, req);
 595         }
 596
 597         RETURN(rc);
 598 }
 599
 600 /*
 601  * ->l_blocking_ast() method for server-side locks. This is invoked when newly
 602  * enqueued server lock conflicts with given one.
 603  *
 604  * Sends blocking ast rpc to the client owning that lock; arms timeout timer
 605  * to wait for client response.
 606  */
 607 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
 608                              struct ldlm_lock_desc *desc,
 609                              void *data, int flag)
 610 {
 611         struct ldlm_cb_set_arg *arg = data;
 612         struct ldlm_request    *body;
 613         struct ptlrpc_request  *req;
 614         int                     instant_cancel = 0;
 615         int                     rc = 0;
 616         ENTRY;
 617
 618         if (flag == LDLM_CB_CANCELING)
 619                 /* Don't need to do anything here. */
 620                 RETURN(0);
 621
 622         LASSERT(lock);
 623         LASSERT(data != NULL);
 624         if (lock->l_export->exp_obd->obd_recovering != 0) {
 625                 LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
 626                 ldlm_lock_dump(D_ERROR, lock, 0);
 627         }
 628
 629         req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
 630                                         &RQF_LDLM_BL_CALLBACK,
 631                                         LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK);
 632         if (req == NULL)
 633                 RETURN(-ENOMEM);
 634
 635         req->rq_async_args.pointer_arg[0] = arg;
 636         req->rq_async_args.pointer_arg[1] = lock;
 637         req->rq_interpret_reply = ldlm_cb_interpret;
 638         req->rq_no_resend = 1;
 639
 640         lock_res(lock->l_resource);
 641         if (lock->l_granted_mode != lock->l_req_mode) {
 642                 /* this blocking AST will be communicated as part of the
 643                  * completion AST instead */
 644                 unlock_res(lock->l_resource);
 645                 ptlrpc_req_finished(req);
 646                 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
 647                 RETURN(0);
 648         }
 649
 650         if (lock->l_destroyed) {
 651                 /* What's the point? */
 652                 unlock_res(lock->l_resource);
 653                 ptlrpc_req_finished(req);
 654                 RETURN(0);
 655         }
 656
 657         if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
 658                 instant_cancel = 1;
 659
 660         body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
 661         body->lock_handle[0] = lock->l_remote_handle;
 662         body->lock_desc = *desc;
 663         body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
 664
 665         LDLM_DEBUG(lock, "server preparing blocking AST");
 666
 667         ptlrpc_request_set_replen(req);
 668         if (instant_cancel) {
 669                 unlock_res(lock->l_resource);
 670                 ldlm_lock_cancel(lock);
 671         } else {
 672                 LASSERT(lock->l_granted_mode == lock->l_req_mode);
 673                 ldlm_add_waiting_lock(lock);
 674                 unlock_res(lock->l_resource);
 675         }
 676
 677         req->rq_send_state = LUSTRE_IMP_FULL;
 678         /* ptlrpc_prep_req already set timeout */
 679         if (AT_OFF)
 680                 req->rq_timeout = ldlm_get_rq_timeout();
 681
 682         if (lock->l_export && lock->l_export->exp_nid_stats &&
 683             lock->l_export->exp_nid_stats->nid_ldlm_stats)
 684                 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
 685                                      LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
 686
 687         rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
 688
 689         RETURN(rc);
 690 }
 691
 692 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data)
 693 {
 694         struct ldlm_cb_set_arg *arg = data;
 695         struct ldlm_request    *body;
 696         struct ptlrpc_request  *req;
 697         struct timeval          granted_time;
 698         long                    total_enqueue_wait;
 699         int                     instant_cancel = 0;
 700         int                     rc = 0;
 701         ENTRY;
 702
 703         LASSERT(lock != NULL);
 704         LASSERT(data != NULL);
 705
 706         do_gettimeofday(&granted_time);
 707         total_enqueue_wait = cfs_timeval_sub(&granted_time,
 708                                              &lock->l_enqueued_time, NULL);
 709
 710         if (total_enqueue_wait / ONE_MILLION > obd_timeout)
 711                 /* non-fatal with AT - change to LDLM_DEBUG? */
 712                 LDLM_ERROR(lock, "enqueue wait took %luus from "CFS_TIME_T,
 713                            total_enqueue_wait, lock->l_enqueued_time.tv_sec);
 714
 715          req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse,
 716                                     &RQF_LDLM_CP_CALLBACK);
 717          if (req == NULL)
 718                  RETURN(-ENOMEM);
 719
 720         lock_res_and_lock(lock);
 721         if (lock->l_resource->lr_lvb_len)
 722                  req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT,
 723                                       lock->l_resource->lr_lvb_len);
 724         unlock_res_and_lock(lock);
 725
 726         rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK);
 727         if (rc) {
 728                 ptlrpc_request_free(req);
 729                 RETURN(rc);
 730         }
 731
 732         req->rq_async_args.pointer_arg[0] = arg;
 733         req->rq_async_args.pointer_arg[1] = lock;
 734         req->rq_interpret_reply = ldlm_cb_interpret;
 735         req->rq_no_resend = 1;
 736         body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
 737
 738         body->lock_handle[0] = lock->l_remote_handle;
 739         body->lock_flags = flags;
 740         ldlm_lock2desc(lock, &body->lock_desc);
 741         if (lock->l_resource->lr_lvb_len) {
 742                 void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB);
 743
 744                 lock_res_and_lock(lock);
 745                 memcpy(lvb, lock->l_resource->lr_lvb_data,
 746                        lock->l_resource->lr_lvb_len);
 747                 unlock_res_and_lock(lock);
 748         }
 749
 750         LDLM_DEBUG(lock, "server preparing completion AST (after %ldus wait)",
 751                    total_enqueue_wait);
 752
 753         /* Server-side enqueue wait time estimate, used in
 754             __ldlm_add_waiting_lock to set future enqueue timers */
 755         at_add(&lock->l_resource->lr_namespace->ns_at_estimate,
 756                total_enqueue_wait / ONE_MILLION);
 757
 758         ptlrpc_request_set_replen(req);
 759
 760         req->rq_send_state = LUSTRE_IMP_FULL;
 761         /* ptlrpc_prep_req already set timeout */
 762         if (AT_OFF)
 763                 req->rq_timeout = ldlm_get_rq_timeout();
 764
 765         /* We only send real blocking ASTs after the lock is granted */
 766         lock_res_and_lock(lock);
 767         if (lock->l_flags & LDLM_FL_AST_SENT) {
 768                 body->lock_flags |= LDLM_FL_AST_SENT;
 769
 770                 /* We might get here prior to ldlm_handle_enqueue setting
 771                  * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
 772                  * into waiting list, but this is safe and similar code in
 773                  * ldlm_handle_enqueue will call ldlm_lock_cancel() still,
 774                  * that would not only cancel the lock, but will also remove
 775                  * it from waiting list */
 776                 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
 777                         unlock_res_and_lock(lock);
 778                         ldlm_lock_cancel(lock);
 779                         instant_cancel = 1;
 780                         lock_res_and_lock(lock);
 781                 } else {
 782                         /* start the lock-timeout clock */
 783                         ldlm_add_waiting_lock(lock);
 784                 }
 785         }
 786         unlock_res_and_lock(lock);
 787
 788         if (lock->l_export && lock->l_export->exp_nid_stats &&
 789             lock->l_export->exp_nid_stats->nid_ldlm_stats)
 790                 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
 791                                      LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
 792
 793         rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
 794
 795         RETURN(rc);
 796 }
 797
 798 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
 799 {
 800         struct ldlm_resource  *res = lock->l_resource;
 801         struct ldlm_request   *body;
 802         struct ptlrpc_request *req;
 803         int                    rc;
 804         ENTRY;
 805
 806         LASSERT(lock != NULL);
 807
 808         req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
 809                                         &RQF_LDLM_GL_CALLBACK,
 810                                         LUSTRE_DLM_VERSION, LDLM_GL_CALLBACK);
 811
 812         if (req == NULL)
 813                 RETURN(-ENOMEM);
 814
 815         body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
 816         body->lock_handle[0] = lock->l_remote_handle;
 817         ldlm_lock2desc(lock, &body->lock_desc);
 818
 819         lock_res_and_lock(lock);
 820         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
 821                              lock->l_resource->lr_lvb_len);
 822         unlock_res_and_lock(lock);
 823         res = lock->l_resource;
 824         ptlrpc_request_set_replen(req);
 825
 826
 827         req->rq_send_state = LUSTRE_IMP_FULL;
 828         /* ptlrpc_prep_req already set timeout */
 829         if (AT_OFF)
 830                 req->rq_timeout = ldlm_get_rq_timeout();
 831
 832         if (lock->l_export && lock->l_export->exp_nid_stats &&
 833             lock->l_export->exp_nid_stats->nid_ldlm_stats)
 834                 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
 835                                      LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
 836
 837         rc = ptlrpc_queue_wait(req);
 838         if (rc == -ELDLM_NO_LOCK_DATA)
 839                 LDLM_DEBUG(lock, "lost race - client has a lock but no inode");
 840         else if (rc != 0)
 841                 rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
 842         else
 843                 rc = ldlm_res_lvbo_update(res, req->rq_repmsg,
 844                                           REPLY_REC_OFF, 1);
 845         ptlrpc_req_finished(req);
 846         if (rc == -ERESTART)
 847                 ldlm_reprocess_all(res);
 848
 849         RETURN(rc);
 850 }
 851
 852 #ifdef __KERNEL__
 853 extern unsigned long long lu_time_stamp_get(void);
 854 #else
 855 #define lu_time_stamp_get() time(NULL)
 856 #endif
 857
 858 static void ldlm_svc_get_eopc(const struct ldlm_request *dlm_req,
 859                        struct lprocfs_stats *srv_stats)
 860 {
 861         int lock_type = 0, op = 0;
 862
 863         lock_type = dlm_req->lock_desc.l_resource.lr_type;
 864
 865         switch (lock_type) {
 866         case LDLM_PLAIN:
 867                 op = PTLRPC_LAST_CNTR + LDLM_PLAIN_ENQUEUE;
 868                 break;
 869         case LDLM_EXTENT:
 870                 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT)
 871                         op = PTLRPC_LAST_CNTR + LDLM_GLIMPSE_ENQUEUE;
 872                 else
 873                         op = PTLRPC_LAST_CNTR + LDLM_EXTENT_ENQUEUE;
 874                 break;
 875         case LDLM_FLOCK:
 876                 op = PTLRPC_LAST_CNTR + LDLM_FLOCK_ENQUEUE;
 877                 break;
 878         case LDLM_IBITS:
 879                 op = PTLRPC_LAST_CNTR + LDLM_IBITS_ENQUEUE;
 880                 break;
 881         default:
 882                 op = 0;
 883                 break;
 884         }
 885
 886         if (op)
 887                 lprocfs_counter_incr(srv_stats, op);
 888
 889         return ;
 890 }
 891
 892 /*
 893  * Main server-side entry point into LDLM. This is called by ptlrpc service
 894  * threads to carry out client lock enqueueing requests.
 895  */
 896 int ldlm_handle_enqueue0(struct ldlm_namespace *ns,
 897                          struct ptlrpc_request *req,
 898                          const struct ldlm_request *dlm_req,
 899                          const struct ldlm_callback_suite *cbs)
 900 {
 901         struct ldlm_reply *dlm_rep;
 902         __u32 flags;
 903         ldlm_error_t err = ELDLM_OK;
 904         struct ldlm_lock *lock = NULL;
 905         void *cookie = NULL;
 906         int rc = 0;
 907         ENTRY;
 908
 909         LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
 910
 911         ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF);
 912         flags = dlm_req->lock_flags;
 913
 914         LASSERT(req->rq_export);
 915
 916         if (req->rq_rqbd->rqbd_service->srv_stats)
 917                 ldlm_svc_get_eopc(dlm_req,
 918                                   req->rq_rqbd->rqbd_service->srv_stats);
 919
 920         if (req->rq_export && req->rq_export->exp_nid_stats &&
 921             req->rq_export->exp_nid_stats->nid_ldlm_stats)
 922                 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
 923                                      LDLM_ENQUEUE - LDLM_FIRST_OPC);
 924
 925         if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE ||
 926                      dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) {
 927                 DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
 928                           dlm_req->lock_desc.l_resource.lr_type);
 929                 GOTO(out, rc = -EFAULT);
 930         }
 931
 932         if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE ||
 933                      dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE ||
 934                      dlm_req->lock_desc.l_req_mode &
 935                      (dlm_req->lock_desc.l_req_mode-1))) {
 936                 DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
 937                           dlm_req->lock_desc.l_req_mode);
 938                 GOTO(out, rc = -EFAULT);
 939         }
 940
 941         if (req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) {
 942                 if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
 943                              LDLM_PLAIN)) {
 944                         DEBUG_REQ(D_ERROR, req,
 945                                   "PLAIN lock request from IBITS client?");
 946                         GOTO(out, rc = -EPROTO);
 947                 }
 948         } else if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
 949                             LDLM_IBITS)) {
 950                 DEBUG_REQ(D_ERROR, req,
 951                           "IBITS lock request from unaware client?");
 952                 GOTO(out, rc = -EPROTO);
 953         }
 954
 955 #if 0
 956         /* FIXME this makes it impossible to use LDLM_PLAIN locks -- check
 957            against server's _CONNECT_SUPPORTED flags? (I don't want to use
 958            ibits for mgc/mgs) */
 959
 960         /* INODEBITS_INTEROP: Perform conversion from plain lock to
 961          * inodebits lock if client does not support them. */
 962         if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) &&
 963             (dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN)) {
 964                 dlm_req->lock_desc.l_resource.lr_type = LDLM_IBITS;
 965                 dlm_req->lock_desc.l_policy_data.l_inodebits.bits =
 966                         MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE;
 967                 if (dlm_req->lock_desc.l_req_mode == LCK_PR)
 968                         dlm_req->lock_desc.l_req_mode = LCK_CR;
 969         }
 970 #endif
 971
 972         if (unlikely(flags & LDLM_FL_REPLAY)) {
 973                 /* Find an existing lock in the per-export lock hash */
 974                 lock = lustre_hash_lookup(req->rq_export->exp_lock_hash,
 975                                           (void *)&dlm_req->lock_handle[0]);
 976                 if (lock != NULL) {
 977                         DEBUG_REQ(D_DLMTRACE, req, "found existing lock cookie "
 978                                   LPX64, lock->l_handle.h_cookie);
 979                         GOTO(existing_lock, rc = 0);
 980                 }
 981         }
 982
 983         /* The lock's callback data might be set in the policy function */
 984         lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
 985                                 dlm_req->lock_desc.l_resource.lr_type,
 986                                 dlm_req->lock_desc.l_req_mode,
 987                                 cbs, NULL, 0);
 988
 989         if (!lock)
 990                 GOTO(out, rc = -ENOMEM);
 991
 992         do_gettimeofday(&lock->l_enqueued_time);
 993         lock->l_remote_handle = dlm_req->lock_handle[0];
 994         LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
 995
 996         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
 997         /* Don't enqueue a lock onto the export if it has already
 998          * been evicted.  Cancel it now instead. (bug 3822) */
 999         if (req->rq_export->exp_failed) {
1000                 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1001                 GOTO(out, rc = -ENOTCONN);
1002         }
1003         lock->l_export = class_export_get(req->rq_export);
1004
1005         if (lock->l_export->exp_lock_hash)
1006                 lustre_hash_add(lock->l_export->exp_lock_hash,
1007                                 &lock->l_remote_handle,
1008                                 &lock->l_exp_hash);
1009
1010 existing_lock:
1011
1012         if (flags & LDLM_FL_HAS_INTENT) {
1013                 /* In this case, the reply buffer is allocated deep in
1014                  * local_lock_enqueue by the policy function. */
1015                 cookie = req;
1016         } else {
1017                 lock_res_and_lock(lock);
1018                 if (lock->l_resource->lr_lvb_len) {
1019                         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
1020                                              RCL_SERVER,
1021                                              lock->l_resource->lr_lvb_len);
1022                 }
1023                 unlock_res_and_lock(lock);
1024
1025                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
1026                         GOTO(out, rc = -ENOMEM);
1027
1028                 rc = req_capsule_server_pack(&req->rq_pill);
1029                 if (rc)
1030                         GOTO(out, rc);
1031         }
1032
1033         if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN)
1034                 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1035         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
1036                 lock->l_req_extent = lock->l_policy_data.l_extent;
1037
1038         err = ldlm_lock_enqueue(ns, &lock, cookie, (int *)&flags);
1039         if (err)
1040                 GOTO(out, err);
1041
1042         dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1043         dlm_rep->lock_flags = flags;
1044
1045         ldlm_lock2desc(lock, &dlm_rep->lock_desc);
1046         ldlm_lock2handle(lock, &dlm_rep->lock_handle);
1047
1048         /* We never send a blocking AST until the lock is granted, but
1049          * we can tell it right now */
1050         lock_res_and_lock(lock);
1051
1052         /* Now take into account flags to be inherited from original lock
1053            request both in reply to client and in our own lock flags. */
1054         dlm_rep->lock_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1055         lock->l_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1056
1057         /* Don't move a pending lock onto the export if it has already
1058          * been evicted.  Cancel it now instead. (bug 5683) */
1059         if (unlikely(req->rq_export->exp_failed ||
1060                      OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
1061                 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1062                 rc = -ENOTCONN;
1063         } else if (lock->l_flags & LDLM_FL_AST_SENT) {
1064                 dlm_rep->lock_flags |= LDLM_FL_AST_SENT;
1065                 if (lock->l_granted_mode == lock->l_req_mode) {
1066                         /*
1067                          * Only cancel lock if it was granted, because it would
1068                          * be destroyed immediatelly and would never be granted
1069                          * in the future, causing timeouts on client.  Not
1070                          * granted lock will be cancelled immediatelly after
1071                          * sending completion AST.
1072                          */
1073                         if (dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1074                                 unlock_res_and_lock(lock);
1075                                 ldlm_lock_cancel(lock);
1076                                 lock_res_and_lock(lock);
1077                         } else
1078                                 ldlm_add_waiting_lock(lock);
1079                 }
1080         }
1081         /* Make sure we never ever grant usual metadata locks to liblustre
1082            clients */
1083         if ((dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN ||
1084             dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) &&
1085              req->rq_export->exp_libclient) {
1086                 if (unlikely(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) ||
1087                              !(dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK))){
1088                         CERROR("Granting sync lock to libclient. "
1089                                "req fl %d, rep fl %d, lock fl %d\n",
1090                                dlm_req->lock_flags, dlm_rep->lock_flags,
1091                                lock->l_flags);
1092                         LDLM_ERROR(lock, "sync lock");
1093                         if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT) {
1094                                 struct ldlm_intent *it;
1095
1096                                 it = req_capsule_client_get(&req->rq_pill,
1097                                                             &RMF_LDLM_INTENT);
1098                                 if (it != NULL) {
1099                                         CERROR("This is intent %s ("LPU64")\n",
1100                                                ldlm_it2str(it->opc), it->opc);
1101                                 }
1102                         }
1103                 }
1104         }
1105
1106         unlock_res_and_lock(lock);
1107
1108         EXIT;
1109  out:
1110         req->rq_status = rc ?: err; /* return either error - bug 11190 */
1111         if (!req->rq_packed_final) {
1112                 err = lustre_pack_reply(req, 1, NULL, NULL);
1113                 if (rc == 0)
1114                         rc = err;
1115         }
1116
1117         /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
1118          * ldlm_reprocess_all.  If this moves, revisit that code. -phil */
1119         if (lock) {
1120                 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
1121                            "(err=%d, rc=%d)", err, rc);
1122
1123                 lock_res_and_lock(lock);
1124                 if (rc == 0) {
1125                         if (lock->l_resource->lr_lvb_len > 0) {
1126                                 void *lvb;
1127
1128                                 lvb = req_capsule_server_get(&req->rq_pill,
1129                                                              &RMF_DLM_LVB);
1130                                 LASSERTF(lvb != NULL, "req %p, lock %p\n",
1131                                          req, lock);
1132
1133                                 memcpy(lvb, lock->l_resource->lr_lvb_data,
1134                                        lock->l_resource->lr_lvb_len);
1135                         }
1136                 } else {
1137                         ldlm_resource_unlink_lock(lock);
1138                         ldlm_lock_destroy_nolock(lock);
1139                 }
1140                 unlock_res_and_lock(lock);
1141
1142                 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
1143                         ldlm_reprocess_all(lock->l_resource);
1144
1145                 LDLM_LOCK_PUT(lock);
1146         }
1147
1148         LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
1149                           lock, rc);
1150
1151         return rc;
1152 }
1153
1154 int ldlm_handle_enqueue(struct ptlrpc_request *req,
1155                         ldlm_completion_callback completion_callback,
1156                         ldlm_blocking_callback blocking_callback,
1157                         ldlm_glimpse_callback glimpse_callback)
1158 {
1159         struct ldlm_request *dlm_req;
1160         struct ldlm_callback_suite cbs = {
1161                 .lcs_completion = completion_callback,
1162                 .lcs_blocking   = blocking_callback,
1163                 .lcs_glimpse    = glimpse_callback
1164         };
1165         int rc;
1166
1167         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1168         if (dlm_req != NULL) {
1169                 rc = ldlm_handle_enqueue0(req->rq_export->exp_obd->obd_namespace,
1170                                           req, dlm_req, &cbs);
1171         } else {
1172                 rc = -EFAULT;
1173         }
1174         return rc;
1175 }
1176
1177 int ldlm_handle_convert0(struct ptlrpc_request *req,
1178                          const struct ldlm_request *dlm_req)
1179 {
1180         struct ldlm_reply *dlm_rep;
1181         struct ldlm_lock *lock;
1182         int rc;
1183         ENTRY;
1184
1185         if (req->rq_export && req->rq_export->exp_nid_stats &&
1186             req->rq_export->exp_nid_stats->nid_ldlm_stats)
1187                 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1188                                      LDLM_CONVERT - LDLM_FIRST_OPC);
1189
1190         rc = req_capsule_server_pack(&req->rq_pill);
1191         if (rc)
1192                 RETURN(rc);
1193
1194         dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1195         dlm_rep->lock_flags = dlm_req->lock_flags;
1196
1197         lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
1198         if (!lock) {
1199                 req->rq_status = EINVAL;
1200         } else {
1201                 void *res = NULL;
1202
1203                 LDLM_DEBUG(lock, "server-side convert handler START");
1204
1205                 do_gettimeofday(&lock->l_enqueued_time);
1206                 res = ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
1207                                         &dlm_rep->lock_flags);
1208                 if (res) {
1209                         if (ldlm_del_waiting_lock(lock))
1210                                 LDLM_DEBUG(lock, "converted waiting lock");
1211                         req->rq_status = 0;
1212                 } else {
1213                         req->rq_status = EDEADLOCK;
1214                 }
1215         }
1216
1217         if (lock) {
1218                 if (!req->rq_status)
1219                         ldlm_reprocess_all(lock->l_resource);
1220                 LDLM_DEBUG(lock, "server-side convert handler END");
1221                 LDLM_LOCK_PUT(lock);
1222         } else
1223                 LDLM_DEBUG_NOLOCK("server-side convert handler END");
1224
1225         RETURN(0);
1226 }
1227
1228 int ldlm_handle_convert(struct ptlrpc_request *req)
1229 {
1230         int rc;
1231         struct ldlm_request *dlm_req;
1232
1233         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1234         if (dlm_req != NULL) {
1235                 rc = ldlm_handle_convert0(req, dlm_req);
1236         } else {
1237                 CERROR ("Can't unpack dlm_req\n");
1238                 rc = -EFAULT;
1239         }
1240         return rc;
1241 }
1242
1243 /* Cancel all the locks whos handles are packed into ldlm_request */
1244 int ldlm_request_cancel(struct ptlrpc_request *req,
1245                         const struct ldlm_request *dlm_req, int first)
1246 {
1247         struct ldlm_resource *res, *pres = NULL;
1248         struct ldlm_lock *lock;
1249         int i, count, done = 0;
1250         ENTRY;
1251
1252         count = dlm_req->lock_count ? dlm_req->lock_count : 1;
1253         if (first >= count)
1254                 RETURN(0);
1255
1256         /* There is no lock on the server at the replay time,
1257          * skip lock cancelling to make replay tests to pass. */
1258         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1259                 RETURN(0);
1260
1261         LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, "
1262                           "starting at %d", count, first);
1263
1264         for (i = first; i < count; i++) {
1265                 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
1266                 if (!lock) {
1267                         LDLM_DEBUG_NOLOCK("server-side cancel handler stale "
1268                                           "lock (cookie "LPU64")",
1269                                           dlm_req->lock_handle[i].cookie);
1270                         continue;
1271                 }
1272
1273                 res = lock->l_resource;
1274                 done++;
1275
1276                 if (res != pres) {
1277                         if (pres != NULL) {
1278                                 ldlm_reprocess_all(pres);
1279                                 ldlm_resource_putref(pres);
1280                         }
1281                         if (res != NULL) {
1282                                 ldlm_resource_getref(res);
1283                                 ldlm_res_lvbo_update(res, NULL, 0, 1);
1284                         }
1285                         pres = res;
1286                 }
1287                 ldlm_lock_cancel(lock);
1288                 LDLM_LOCK_PUT(lock);
1289         }
1290         if (pres != NULL) {
1291                 ldlm_reprocess_all(pres);
1292                 ldlm_resource_putref(pres);
1293         }
1294         LDLM_DEBUG_NOLOCK("server-side cancel handler END");
1295         RETURN(done);
1296 }
1297
1298 int ldlm_handle_cancel(struct ptlrpc_request *req)
1299 {
1300         struct ldlm_request *dlm_req;
1301         int rc;
1302         ENTRY;
1303
1304         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1305         if (dlm_req == NULL) {
1306                 CDEBUG(D_INFO, "bad request buffer for cancel\n");
1307                 RETURN(-EFAULT);
1308         }
1309
1310         if (req->rq_export && req->rq_export->exp_nid_stats &&
1311             req->rq_export->exp_nid_stats->nid_ldlm_stats)
1312                 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1313                                      LDLM_CANCEL - LDLM_FIRST_OPC);
1314
1315         rc = req_capsule_server_pack(&req->rq_pill);
1316         if (rc)
1317                 RETURN(rc);
1318
1319         if (!ldlm_request_cancel(req, dlm_req, 0))
1320                 req->rq_status = ESTALE;
1321
1322         if (ptlrpc_reply(req) != 0)
1323                 LBUG();
1324
1325         RETURN(0);
1326 }
1327
1328 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
1329                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1330 {
1331         int do_ast;
1332         ENTRY;
1333
1334         LDLM_DEBUG(lock, "client blocking AST callback handler START");
1335
1336         lock_res_and_lock(lock);
1337         lock->l_flags |= LDLM_FL_CBPENDING;
1338
1339         if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
1340                 lock->l_flags |= LDLM_FL_CANCEL;
1341
1342         do_ast = (!lock->l_readers && !lock->l_writers);
1343         unlock_res_and_lock(lock);
1344
1345         if (do_ast) {
1346                 LDLM_DEBUG(lock, "already unused, calling "
1347                            "callback (%p)", lock->l_blocking_ast);
1348                 if (lock->l_blocking_ast != NULL)
1349                         lock->l_blocking_ast(lock, ld, lock->l_ast_data,
1350                                              LDLM_CB_BLOCKING);
1351         } else {
1352                 LDLM_DEBUG(lock, "Lock still has references, will be"
1353                            " cancelled later");
1354         }
1355
1356         LDLM_DEBUG(lock, "client blocking callback handler END");
1357         LDLM_LOCK_PUT(lock);
1358         EXIT;
1359 }
1360
1361 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
1362                                     struct ldlm_namespace *ns,
1363                                     struct ldlm_request *dlm_req,
1364                                     struct ldlm_lock *lock)
1365 {
1366         CFS_LIST_HEAD(ast_list);
1367         ENTRY;
1368
1369         LDLM_DEBUG(lock, "client completion callback handler START");
1370
1371         if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) {
1372                 int to = cfs_time_seconds(1);
1373                 while (to > 0) {
1374                         cfs_schedule_timeout(CFS_TASK_INTERRUPTIBLE, to);
1375                         if (lock->l_granted_mode == lock->l_req_mode ||
1376                             lock->l_destroyed)
1377                                 break;
1378                 }
1379         }
1380
1381         lock_res_and_lock(lock);
1382         if (lock->l_destroyed ||
1383             lock->l_granted_mode == lock->l_req_mode) {
1384                 /* bug 11300: the lock has already been granted */
1385                 unlock_res_and_lock(lock);
1386                 LDLM_DEBUG(lock, "Double grant race happened");
1387                 LDLM_LOCK_PUT(lock);
1388                 EXIT;
1389                 return;
1390         }
1391
1392         /* If we receive the completion AST before the actual enqueue returned,
1393          * then we might need to switch lock modes, resources, or extents. */
1394         if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
1395                 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
1396                 LDLM_DEBUG(lock, "completion AST, new lock mode");
1397         }
1398
1399         if (lock->l_resource->lr_type != LDLM_PLAIN) {
1400                 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1401                 LDLM_DEBUG(lock, "completion AST, new policy data");
1402         }
1403
1404         ldlm_resource_unlink_lock(lock);
1405         if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
1406                    &lock->l_resource->lr_name,
1407                    sizeof(lock->l_resource->lr_name)) != 0) {
1408                 unlock_res_and_lock(lock);
1409                 if (ldlm_lock_change_resource(ns, lock,
1410                                 &dlm_req->lock_desc.l_resource.lr_name) != 0) {
1411                         LDLM_ERROR(lock, "Failed to allocate resource");
1412                         LDLM_LOCK_PUT(lock);
1413                         EXIT;
1414                         return;
1415                 }
1416                 LDLM_DEBUG(lock, "completion AST, new resource");
1417                 CERROR("change resource!\n");
1418                 lock_res_and_lock(lock);
1419         }
1420
1421         if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
1422                 /* BL_AST locks are not needed in lru.
1423                  * let ldlm_cancel_lru() be fast. */
1424                 ldlm_lock_remove_from_lru(lock);
1425                 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
1426                 LDLM_DEBUG(lock, "completion AST includes blocking AST");
1427         }
1428
1429         if (lock->l_lvb_len) {
1430                 if (req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB,
1431                                          RCL_CLIENT) < lock->l_lvb_len) {
1432                         LDLM_ERROR(lock, "completion AST did not contain "
1433                                    "expected LVB!");
1434                 } else {
1435                         void *lvb = req_capsule_client_swab_get(&req->rq_pill,
1436                                                                 &RMF_DLM_LVB,
1437                                                   (void *)lock->l_lvb_swabber);
1438                         memcpy(lock->l_lvb_data, lvb, lock->l_lvb_len);
1439                 }
1440         }
1441
1442         ldlm_grant_lock(lock, &ast_list);
1443         unlock_res_and_lock(lock);
1444
1445         LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
1446
1447         ldlm_run_ast_work(&ast_list, LDLM_WORK_CP_AST);
1448
1449         LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
1450                           lock);
1451         LDLM_LOCK_PUT(lock);
1452         EXIT;
1453 }
1454
1455 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
1456                                     struct ldlm_namespace *ns,
1457                                     struct ldlm_request *dlm_req,
1458                                     struct ldlm_lock *lock)
1459 {
1460         int rc = -ENOSYS;
1461         ENTRY;
1462
1463         LDLM_DEBUG(lock, "client glimpse AST callback handler");
1464
1465         if (lock->l_glimpse_ast != NULL)
1466                 rc = lock->l_glimpse_ast(lock, req);
1467
1468         if (req->rq_repmsg != NULL) {
1469                 ptlrpc_reply(req);
1470         } else {
1471                 req->rq_status = rc;
1472                 ptlrpc_error(req);
1473         }
1474
1475         lock_res_and_lock(lock);
1476         if (lock->l_granted_mode == LCK_PW &&
1477             !lock->l_readers && !lock->l_writers &&
1478             cfs_time_after(cfs_time_current(),
1479                            cfs_time_add(lock->l_last_used,
1480                                         cfs_time_seconds(10)))) {
1481                 unlock_res_and_lock(lock);
1482                 if (ldlm_bl_to_thread_lock(ns, NULL, lock))
1483                         ldlm_handle_bl_callback(ns, NULL, lock);
1484
1485                 EXIT;
1486                 return;
1487         }
1488         unlock_res_and_lock(lock);
1489         LDLM_LOCK_PUT(lock);
1490         EXIT;
1491 }
1492
1493 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1494 {
1495         if (req->rq_no_reply)
1496                 return 0;
1497
1498         req->rq_status = rc;
1499         if (!req->rq_packed_final) {
1500                 rc = lustre_pack_reply(req, 1, NULL, NULL);
1501                 if (rc)
1502                         return rc;
1503         }
1504         return ptlrpc_reply(req);
1505 }
1506
1507 #ifdef __KERNEL__
1508 static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
1509                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock,
1510                              struct list_head *cancels, int count)
1511 {
1512         struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1513         struct ldlm_bl_work_item *blwi;
1514         ENTRY;
1515
1516         if (cancels && count == 0)
1517                 RETURN(0);
1518
1519         OBD_ALLOC(blwi, sizeof(*blwi));
1520         if (blwi == NULL)
1521                 RETURN(-ENOMEM);
1522
1523         blwi->blwi_ns = ns;
1524         if (ld != NULL)
1525                 blwi->blwi_ld = *ld;
1526         if (count) {
1527                 list_add(&blwi->blwi_head, cancels);
1528                 list_del_init(cancels);
1529                 blwi->blwi_count = count;
1530         } else {
1531                 blwi->blwi_lock = lock;
1532         }
1533         spin_lock(&blp->blp_lock);
1534         if (lock && lock->l_flags & LDLM_FL_DISCARD_DATA) {
1535                 /* add LDLM_FL_DISCARD_DATA requests to the priority list */
1536                 list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
1537         } else {
1538                 /* other blocking callbacks are added to the regular list */
1539                 list_add_tail(&blwi->blwi_entry, &blp->blp_list);
1540         }
1541         cfs_waitq_signal(&blp->blp_waitq);
1542         spin_unlock(&blp->blp_lock);
1543
1544         RETURN(0);
1545 }
1546 #endif
1547
1548 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1549                            struct ldlm_lock *lock)
1550 {
1551 #ifdef __KERNEL__
1552         RETURN(ldlm_bl_to_thread(ns, ld, lock, NULL, 0));
1553 #else
1554         RETURN(-ENOSYS);
1555 #endif
1556 }
1557
1558 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1559                            struct list_head *cancels, int count)
1560 {
1561 #ifdef __KERNEL__
1562         RETURN(ldlm_bl_to_thread(ns, ld, NULL, cancels, count));
1563 #else
1564         RETURN(-ENOSYS);
1565 #endif
1566 }
1567
1568 /* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */
1569 static int ldlm_callback_handler(struct ptlrpc_request *req)
1570 {
1571         struct ldlm_namespace *ns;
1572         struct ldlm_request *dlm_req;
1573         struct ldlm_lock *lock;
1574         int rc;
1575         ENTRY;
1576
1577         /* Requests arrive in sender's byte order.  The ptlrpc service
1578          * handler has already checked and, if necessary, byte-swapped the
1579          * incoming request message body, but I am responsible for the
1580          * message buffers. */
1581
1582         /* do nothing for sec context finalize */
1583         if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI)
1584                 RETURN(0);
1585
1586         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
1587
1588         if (req->rq_export == NULL) {
1589                 struct ldlm_request *dlm_req;
1590
1591                 CDEBUG(D_RPCTRACE, "operation %d from %s with bad "
1592                        "export cookie "LPX64"; this is "
1593                        "normal if this node rebooted with a lock held\n",
1594                        lustre_msg_get_opc(req->rq_reqmsg),
1595                        libcfs_id2str(req->rq_peer),
1596                        lustre_msg_get_handle(req->rq_reqmsg)->cookie);
1597
1598                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1599                 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1600                 if (dlm_req != NULL)
1601                         CDEBUG(D_RPCTRACE, "--> lock cookie: "LPX64"\n",
1602                                dlm_req->lock_handle[0].cookie);
1603
1604                 ldlm_callback_reply(req, -ENOTCONN);
1605                 RETURN(0);
1606         }
1607
1608         LASSERT(req->rq_export != NULL);
1609         LASSERT(req->rq_export->exp_obd != NULL);
1610
1611         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1612         case LDLM_BL_CALLBACK:
1613                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK))
1614                         RETURN(0);
1615                 break;
1616         case LDLM_CP_CALLBACK:
1617                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK))
1618                         RETURN(0);
1619                 break;
1620         case LDLM_GL_CALLBACK:
1621                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK))
1622                         RETURN(0);
1623                 break;
1624         case OBD_LOG_CANCEL: /* remove this eventually - for 1.4.0 compat */
1625                 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
1626                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
1627                         RETURN(0);
1628                 rc = llog_origin_handle_cancel(req);
1629                 ldlm_callback_reply(req, rc);
1630                 RETURN(0);
1631         case OBD_QC_CALLBACK:
1632                 req_capsule_set(&req->rq_pill, &RQF_QC_CALLBACK);
1633                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_QC_CALLBACK_NET))
1634                         RETURN(0);
1635                 rc = target_handle_qc_callback(req);
1636                 ldlm_callback_reply(req, rc);
1637                 RETURN(0);
1638         case QUOTA_DQACQ:
1639         case QUOTA_DQREL:
1640                 /* reply in handler */
1641                 req_capsule_set(&req->rq_pill, &RQF_MDS_QUOTA_DQACQ);
1642                 rc = target_handle_dqacq_callback(req);
1643                 RETURN(0);
1644         case LLOG_ORIGIN_HANDLE_CREATE:
1645                 req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
1646                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1647                         RETURN(0);
1648                 rc = llog_origin_handle_create(req);
1649                 ldlm_callback_reply(req, rc);
1650                 RETURN(0);
1651         case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
1652                 req_capsule_set(&req->rq_pill,
1653                                 &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
1654                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1655                         RETURN(0);
1656                 rc = llog_origin_handle_next_block(req);
1657                 ldlm_callback_reply(req, rc);
1658                 RETURN(0);
1659         case LLOG_ORIGIN_HANDLE_READ_HEADER:
1660                 req_capsule_set(&req->rq_pill,
1661                                 &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER);
1662                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1663                         RETURN(0);
1664                 rc = llog_origin_handle_read_header(req);
1665                 ldlm_callback_reply(req, rc);
1666                 RETURN(0);
1667         case LLOG_ORIGIN_HANDLE_CLOSE:
1668                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1669                         RETURN(0);
1670                 rc = llog_origin_handle_close(req);
1671                 ldlm_callback_reply(req, rc);
1672                 RETURN(0);
1673         default:
1674                 CERROR("unknown opcode %u\n",
1675                        lustre_msg_get_opc(req->rq_reqmsg));
1676                 ldlm_callback_reply(req, -EPROTO);
1677                 RETURN(0);
1678         }
1679
1680         ns = req->rq_export->exp_obd->obd_namespace;
1681         LASSERT(ns != NULL);
1682
1683         req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1684
1685         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1686         if (dlm_req == NULL) {
1687                 ldlm_callback_reply(req, -EPROTO);
1688                 RETURN(0);
1689         }
1690
1691         /* Force a known safe race, send a cancel to the server for a lock
1692          * which the server has already started a blocking callback on. */
1693         if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE) &&
1694             lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1695                 rc = ldlm_cli_cancel(&dlm_req->lock_handle[0]);
1696                 if (rc < 0)
1697                         CERROR("ldlm_cli_cancel: %d\n", rc);
1698         }
1699
1700         lock = ldlm_handle2lock_ns(ns, &dlm_req->lock_handle[0]);
1701         if (!lock) {
1702                 CDEBUG(D_DLMTRACE, "callback on lock "LPX64" - lock "
1703                        "disappeared\n", dlm_req->lock_handle[0].cookie);
1704                 ldlm_callback_reply(req, -EINVAL);
1705                 RETURN(0);
1706         }
1707
1708         /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
1709         lock_res_and_lock(lock);
1710         lock->l_flags |= (dlm_req->lock_flags & LDLM_AST_FLAGS);
1711         if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1712                 /* If somebody cancels locks and cache is already droped,
1713                  * we can tell the server we have no lock. Otherwise, we
1714                  * should send cancel after dropping the cache. */
1715                 if ((lock->l_flags & LDLM_FL_CANCELING) &&
1716                     (lock->l_flags & LDLM_FL_BL_DONE)) {
1717                         LDLM_DEBUG(lock, "callback on lock "
1718                                    LPX64" - lock disappeared\n",
1719                                    dlm_req->lock_handle[0].cookie);
1720                         unlock_res_and_lock(lock);
1721                         LDLM_LOCK_PUT(lock);
1722                         ldlm_callback_reply(req, -EINVAL);
1723                         RETURN(0);
1724                 }
1725                 /* BL_AST locks are not needed in lru.
1726                  * let ldlm_cancel_lru() be fast. */
1727                 ldlm_lock_remove_from_lru(lock);
1728                 lock->l_flags |= LDLM_FL_BL_AST;
1729         }
1730         unlock_res_and_lock(lock);
1731
1732         /* We want the ost thread to get this reply so that it can respond
1733          * to ost requests (write cache writeback) that might be triggered
1734          * in the callback.
1735          *
1736          * But we'd also like to be able to indicate in the reply that we're
1737          * cancelling right now, because it's unused, or have an intent result
1738          * in the reply, so we might have to push the responsibility for sending
1739          * the reply down into the AST handlers, alas. */
1740
1741         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1742         case LDLM_BL_CALLBACK:
1743                 CDEBUG(D_INODE, "blocking ast\n");
1744                 req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
1745                 if (!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK))
1746                         ldlm_callback_reply(req, 0);
1747                 if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
1748                         ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
1749                 break;
1750         case LDLM_CP_CALLBACK:
1751                 CDEBUG(D_INODE, "completion ast\n");
1752                 req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
1753                 ldlm_callback_reply(req, 0);
1754                 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
1755                 break;
1756         case LDLM_GL_CALLBACK:
1757                 CDEBUG(D_INODE, "glimpse ast\n");
1758                 req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
1759                 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
1760                 break;
1761         default:
1762                 LBUG();                         /* checked above */
1763         }
1764
1765         RETURN(0);
1766 }
1767
1768 static int ldlm_cancel_handler(struct ptlrpc_request *req)
1769 {
1770         int rc;
1771         ENTRY;
1772
1773         /* Requests arrive in sender's byte order.  The ptlrpc service
1774          * handler has already checked and, if necessary, byte-swapped the
1775          * incoming request message body, but I am responsible for the
1776          * message buffers. */
1777
1778         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
1779
1780         if (req->rq_export == NULL) {
1781                 struct ldlm_request *dlm_req;
1782
1783                 CERROR("operation %d from %s with bad export cookie "LPU64"\n",
1784                        lustre_msg_get_opc(req->rq_reqmsg),
1785                        libcfs_id2str(req->rq_peer),
1786                        lustre_msg_get_handle(req->rq_reqmsg)->cookie);
1787
1788                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1789                 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1790                 if (dlm_req != NULL)
1791                         ldlm_lock_dump_handle(D_ERROR,
1792                                               &dlm_req->lock_handle[0]);
1793                 ldlm_callback_reply(req, -ENOTCONN);
1794                 RETURN(0);
1795         }
1796
1797         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1798
1799         /* XXX FIXME move this back to mds/handler.c, bug 249 */
1800         case LDLM_CANCEL:
1801                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
1802                 CDEBUG(D_INODE, "cancel\n");
1803                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL))
1804                         RETURN(0);
1805                 rc = ldlm_handle_cancel(req);
1806                 if (rc)
1807                         break;
1808                 RETURN(0);
1809         case OBD_LOG_CANCEL:
1810                 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
1811                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
1812                         RETURN(0);
1813                 rc = llog_origin_handle_cancel(req);
1814                 ldlm_callback_reply(req, rc);
1815                 RETURN(0);
1816         default:
1817                 CERROR("invalid opcode %d\n",
1818                        lustre_msg_get_opc(req->rq_reqmsg));
1819                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1820                 ldlm_callback_reply(req, -EINVAL);
1821         }
1822
1823         RETURN(0);
1824 }
1825
1826 void ldlm_revoke_lock_cb(void *obj, void *data)
1827 {
1828         struct list_head   *rpc_list = data;
1829         struct ldlm_lock   *lock = obj;
1830
1831         lock_res_and_lock(lock);
1832
1833         if (lock->l_req_mode != lock->l_granted_mode) {
1834                 unlock_res_and_lock(lock);
1835                 return;
1836         }
1837
1838         LASSERT(lock->l_resource);
1839         if (lock->l_resource->lr_type != LDLM_IBITS &&
1840             lock->l_resource->lr_type != LDLM_PLAIN) {
1841                 unlock_res_and_lock(lock);
1842                 return;
1843         }
1844
1845         if (lock->l_flags & LDLM_FL_AST_SENT) {
1846                 unlock_res_and_lock(lock);
1847                 return;
1848         }
1849
1850         LASSERT(lock->l_blocking_ast);
1851         LASSERT(!lock->l_blocking_lock);
1852
1853         lock->l_flags |= LDLM_FL_AST_SENT;
1854         if (lock->l_export && lock->l_export->exp_lock_hash)
1855                 lustre_hash_del(lock->l_export->exp_lock_hash,
1856                                 &lock->l_remote_handle, &lock->l_exp_hash);
1857         list_add_tail(&lock->l_rk_ast, rpc_list);
1858         LDLM_LOCK_GET(lock);
1859
1860         unlock_res_and_lock(lock);
1861 }
1862
1863 void ldlm_revoke_export_locks(struct obd_export *exp)
1864 {
1865         struct list_head  rpc_list;
1866         ENTRY;
1867
1868         CFS_INIT_LIST_HEAD(&rpc_list);
1869         lustre_hash_for_each_empty(exp->exp_lock_hash,
1870                                    ldlm_revoke_lock_cb, &rpc_list);
1871         ldlm_run_ast_work(&rpc_list, LDLM_WORK_REVOKE_AST);
1872
1873         EXIT;
1874 }
1875
1876 #ifdef __KERNEL__
1877 static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp)
1878 {
1879         struct ldlm_bl_work_item *blwi = NULL;
1880         static unsigned int num_bl = 0;
1881
1882         spin_lock(&blp->blp_lock);
1883         /* process a request from the blp_list at least every blp_num_threads */
1884         if (!list_empty(&blp->blp_list) &&
1885             (list_empty(&blp->blp_prio_list) || num_bl == 0))
1886                 blwi = list_entry(blp->blp_list.next,
1887                                   struct ldlm_bl_work_item, blwi_entry);
1888         else
1889                 if (!list_empty(&blp->blp_prio_list))
1890                         blwi = list_entry(blp->blp_prio_list.next,
1891                                           struct ldlm_bl_work_item, blwi_entry);
1892
1893         if (blwi) {
1894                 if (++num_bl >= atomic_read(&blp->blp_num_threads))
1895                         num_bl = 0;
1896                 list_del(&blwi->blwi_entry);
1897         }
1898         spin_unlock(&blp->blp_lock);
1899
1900         return blwi;
1901 }
1902
1903 /* This only contains temporary data until the thread starts */
1904 struct ldlm_bl_thread_data {
1905         char                    bltd_name[CFS_CURPROC_COMM_MAX];
1906         struct ldlm_bl_pool     *bltd_blp;
1907         struct completion       bltd_comp;
1908         int                     bltd_num;
1909 };
1910
1911 static int ldlm_bl_thread_main(void *arg);
1912
1913 static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp)
1914 {
1915         struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
1916         int rc;
1917
1918         init_completion(&bltd.bltd_comp);
1919         rc = cfs_kernel_thread(ldlm_bl_thread_main, &bltd, 0);
1920         if (rc < 0) {
1921                 CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %d\n",
1922                        atomic_read(&blp->blp_num_threads), rc);
1923                 return rc;
1924         }
1925         wait_for_completion(&bltd.bltd_comp);
1926
1927         return 0;
1928 }
1929
1930 static int ldlm_bl_thread_main(void *arg)
1931 {
1932         struct ldlm_bl_pool *blp;
1933         ENTRY;
1934
1935         {
1936                 struct ldlm_bl_thread_data *bltd = arg;
1937
1938                 blp = bltd->bltd_blp;
1939
1940                 bltd->bltd_num = atomic_inc_return(&blp->blp_num_threads) - 1;
1941                 atomic_inc(&blp->blp_busy_threads);
1942
1943                 snprintf(bltd->bltd_name, sizeof(bltd->bltd_name) - 1,
1944                         "ldlm_bl_%02d", bltd->bltd_num);
1945                 cfs_daemonize(bltd->bltd_name);
1946
1947                 complete(&bltd->bltd_comp);
1948                 /* cannot use bltd after this, it is only on caller's stack */
1949         }
1950
1951         while (1) {
1952                 struct l_wait_info lwi = { 0 };
1953                 struct ldlm_bl_work_item *blwi = NULL;
1954
1955                 blwi = ldlm_bl_get_work(blp);
1956
1957                 if (blwi == NULL) {
1958                         int busy;
1959
1960                         atomic_dec(&blp->blp_busy_threads);
1961                         l_wait_event_exclusive(blp->blp_waitq,
1962                                          (blwi = ldlm_bl_get_work(blp)) != NULL,
1963                                          &lwi);
1964                         busy = atomic_inc_return(&blp->blp_busy_threads);
1965
1966                         if (blwi->blwi_ns == NULL)
1967                                 /* added by ldlm_cleanup() */
1968                                 break;
1969
1970                         /* Not fatal if racy and have a few too many threads */
1971                         if (unlikely(busy < blp->blp_max_threads &&
1972                                     busy >= atomic_read(&blp->blp_num_threads)))
1973                                 /* discard the return value, we tried */
1974                                 ldlm_bl_thread_start(blp);
1975                 } else {
1976                         if (blwi->blwi_ns == NULL)
1977                                 /* added by ldlm_cleanup() */
1978                                 break;
1979                 }
1980
1981                 if (blwi->blwi_count) {
1982                         /* The special case when we cancel locks in lru
1983                          * asynchronously, we pass the list of locks here.
1984                          * Thus lock is marked LDLM_FL_CANCELING, and already
1985                          * canceled locally. */
1986                         ldlm_cli_cancel_list(&blwi->blwi_head,
1987                                              blwi->blwi_count, NULL, 0);
1988                 } else {
1989                         ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
1990                                                 blwi->blwi_lock);
1991                 }
1992                 OBD_FREE(blwi, sizeof(*blwi));
1993         }
1994
1995         atomic_dec(&blp->blp_busy_threads);
1996         atomic_dec(&blp->blp_num_threads);
1997         complete(&blp->blp_comp);
1998         RETURN(0);
1999 }
2000
2001 #endif
2002
2003 static int ldlm_setup(void);
2004 static int ldlm_cleanup(void);
2005
2006 int ldlm_get_ref(void)
2007 {
2008         int rc = 0;
2009         ENTRY;
2010         mutex_down(&ldlm_ref_sem);
2011         if (++ldlm_refcount == 1) {
2012                 rc = ldlm_setup();
2013                 if (rc)
2014                         ldlm_refcount--;
2015         }
2016         mutex_up(&ldlm_ref_sem);
2017
2018         RETURN(rc);
2019 }
2020
2021 void ldlm_put_ref(void)
2022 {
2023         ENTRY;
2024         mutex_down(&ldlm_ref_sem);
2025         if (ldlm_refcount == 1) {
2026                 int rc = ldlm_cleanup();
2027                 if (rc)
2028                         CERROR("ldlm_cleanup failed: %d\n", rc);
2029                 else
2030                         ldlm_refcount--;
2031         } else {
2032                 ldlm_refcount--;
2033         }
2034         mutex_up(&ldlm_ref_sem);
2035
2036         EXIT;
2037 }
2038
2039 /*
2040  * Export handle<->lock hash operations.
2041  */
2042 static unsigned
2043 ldlm_export_lock_hash(lustre_hash_t *lh, void *key, unsigned mask)
2044 {
2045         return lh_u64_hash(((struct lustre_handle *)key)->cookie, mask);
2046 }
2047
2048 static void *
2049 ldlm_export_lock_key(struct hlist_node *hnode)
2050 {
2051         struct ldlm_lock *lock;
2052         ENTRY;
2053
2054         lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2055         RETURN(&lock->l_remote_handle);
2056 }
2057
2058 static int
2059 ldlm_export_lock_compare(void *key, struct hlist_node *hnode)
2060 {
2061         ENTRY;
2062         RETURN(lustre_handle_equal(ldlm_export_lock_key(hnode), key));
2063 }
2064
2065 static void *
2066 ldlm_export_lock_get(struct hlist_node *hnode)
2067 {
2068         struct ldlm_lock *lock;
2069         ENTRY;
2070
2071         lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2072         LDLM_LOCK_GET(lock);
2073
2074         RETURN(lock);
2075 }
2076
2077 static void *
2078 ldlm_export_lock_put(struct hlist_node *hnode)
2079 {
2080         struct ldlm_lock *lock;
2081         ENTRY;
2082
2083         lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2084         LDLM_LOCK_PUT(lock);
2085
2086         RETURN(lock);
2087 }
2088
2089 static lustre_hash_ops_t ldlm_export_lock_ops = {
2090         .lh_hash    = ldlm_export_lock_hash,
2091         .lh_key     = ldlm_export_lock_key,
2092         .lh_compare = ldlm_export_lock_compare,
2093         .lh_get     = ldlm_export_lock_get,
2094         .lh_put     = ldlm_export_lock_put
2095 };
2096
2097 int ldlm_init_export(struct obd_export *exp)
2098 {
2099         ENTRY;
2100
2101         exp->exp_lock_hash =
2102                 lustre_hash_init(obd_uuid2str(&exp->exp_client_uuid),
2103                                  128, 65536, &ldlm_export_lock_ops, LH_REHASH);
2104
2105         if (!exp->exp_lock_hash)
2106                 RETURN(-ENOMEM);
2107
2108         RETURN(0);
2109 }
2110 EXPORT_SYMBOL(ldlm_init_export);
2111
2112 void ldlm_destroy_export(struct obd_export *exp)
2113 {
2114         ENTRY;
2115         lustre_hash_exit(exp->exp_lock_hash);
2116         exp->exp_lock_hash = NULL;
2117         EXIT;
2118 }
2119 EXPORT_SYMBOL(ldlm_destroy_export);
2120
2121 static int ldlm_setup(void)
2122 {
2123         struct ldlm_bl_pool *blp;
2124         int rc = 0;
2125         int ldlm_min_threads = LDLM_THREADS_AUTO_MIN;
2126         int ldlm_max_threads = LDLM_THREADS_AUTO_MAX;
2127 #ifdef __KERNEL__
2128         int i;
2129 #endif
2130         ENTRY;
2131
2132         if (ldlm_state != NULL)
2133                 RETURN(-EALREADY);
2134
2135         OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
2136         if (ldlm_state == NULL)
2137                 RETURN(-ENOMEM);
2138
2139 #ifdef LPROCFS
2140         rc = ldlm_proc_setup();
2141         if (rc != 0)
2142                 GOTO(out_free, rc);
2143 #endif
2144
2145 #ifdef __KERNEL__
2146         if (ldlm_num_threads) {
2147                 /* If ldlm_num_threads is set, it is the min and the max. */
2148                 if (ldlm_num_threads > LDLM_THREADS_AUTO_MAX)
2149                         ldlm_num_threads = LDLM_THREADS_AUTO_MAX;
2150                 if (ldlm_num_threads < LDLM_THREADS_AUTO_MIN)
2151                         ldlm_num_threads = LDLM_THREADS_AUTO_MIN;
2152                 ldlm_min_threads = ldlm_max_threads = ldlm_num_threads;
2153         }
2154 #endif
2155
2156         ldlm_state->ldlm_cb_service =
2157                 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2158                                 LDLM_MAXREPSIZE, LDLM_CB_REQUEST_PORTAL,
2159                                 LDLM_CB_REPLY_PORTAL, 1800,
2160                                 ldlm_callback_handler, "ldlm_cbd",
2161                                 ldlm_svc_proc_dir, NULL,
2162                                 ldlm_min_threads, ldlm_max_threads,
2163                                 "ldlm_cb",
2164                                 LCT_MD_THREAD|LCT_DT_THREAD);
2165
2166         if (!ldlm_state->ldlm_cb_service) {
2167                 CERROR("failed to start service\n");
2168                 GOTO(out_proc, rc = -ENOMEM);
2169         }
2170
2171         ldlm_state->ldlm_cancel_service =
2172                 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2173                                 LDLM_MAXREPSIZE, LDLM_CANCEL_REQUEST_PORTAL,
2174                                 LDLM_CANCEL_REPLY_PORTAL, 6000,
2175                                 ldlm_cancel_handler, "ldlm_canceld",
2176                                 ldlm_svc_proc_dir, NULL,
2177                                 ldlm_min_threads, ldlm_max_threads,
2178                                 "ldlm_cn",
2179                                 LCT_MD_THREAD|LCT_DT_THREAD|LCT_CL_THREAD);
2180
2181         if (!ldlm_state->ldlm_cancel_service) {
2182                 CERROR("failed to start service\n");
2183                 GOTO(out_proc, rc = -ENOMEM);
2184         }
2185
2186         OBD_ALLOC(blp, sizeof(*blp));
2187         if (blp == NULL)
2188                 GOTO(out_proc, rc = -ENOMEM);
2189         ldlm_state->ldlm_bl_pool = blp;
2190
2191         spin_lock_init(&blp->blp_lock);
2192         CFS_INIT_LIST_HEAD(&blp->blp_list);
2193         CFS_INIT_LIST_HEAD(&blp->blp_prio_list);
2194         cfs_waitq_init(&blp->blp_waitq);
2195         atomic_set(&blp->blp_num_threads, 0);
2196         atomic_set(&blp->blp_busy_threads, 0);
2197         blp->blp_min_threads = ldlm_min_threads;
2198         blp->blp_max_threads = ldlm_max_threads;
2199
2200 #ifdef __KERNEL__
2201         for (i = 0; i < blp->blp_min_threads; i++) {
2202                 rc = ldlm_bl_thread_start(blp);
2203                 if (rc < 0)
2204                         GOTO(out_thread, rc);
2205         }
2206
2207         rc = ptlrpc_start_threads(NULL, ldlm_state->ldlm_cancel_service);
2208         if (rc)
2209                 GOTO(out_thread, rc);
2210
2211         rc = ptlrpc_start_threads(NULL, ldlm_state->ldlm_cb_service);
2212         if (rc)
2213                 GOTO(out_thread, rc);
2214
2215         CFS_INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
2216         expired_lock_thread.elt_state = ELT_STOPPED;
2217         cfs_waitq_init(&expired_lock_thread.elt_waitq);
2218
2219         CFS_INIT_LIST_HEAD(&waiting_locks_list);
2220         spin_lock_init(&waiting_locks_spinlock);
2221         cfs_timer_init(&waiting_locks_timer, waiting_locks_callback, 0);
2222
2223         rc = cfs_kernel_thread(expired_lock_main, NULL, CLONE_VM | CLONE_FILES);
2224         if (rc < 0) {
2225                 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
2226                 GOTO(out_thread, rc);
2227         }
2228
2229         wait_event(expired_lock_thread.elt_waitq,
2230                    expired_lock_thread.elt_state == ELT_READY);
2231 #endif
2232
2233 #ifdef __KERNEL__
2234         rc = ldlm_pools_init();
2235         if (rc)
2236                 GOTO(out_thread, rc);
2237 #endif
2238         RETURN(0);
2239
2240 #ifdef __KERNEL__
2241  out_thread:
2242         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2243         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2244 #endif
2245
2246  out_proc:
2247 #ifdef LPROCFS
2248         ldlm_proc_cleanup();
2249  out_free:
2250 #endif
2251         OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2252         ldlm_state = NULL;
2253         return rc;
2254 }
2255
2256 static int ldlm_cleanup(void)
2257 {
2258 #ifdef __KERNEL__
2259         struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
2260 #endif
2261         ENTRY;
2262
2263         if (!list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) ||
2264             !list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) {
2265                 CERROR("ldlm still has namespaces; clean these up first.\n");
2266                 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
2267                 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
2268                 RETURN(-EBUSY);
2269         }
2270
2271 #ifdef __KERNEL__
2272         ldlm_pools_fini();
2273 #endif
2274
2275 #ifdef __KERNEL__
2276         while (atomic_read(&blp->blp_num_threads) > 0) {
2277                 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
2278
2279                 init_completion(&blp->blp_comp);
2280
2281                 spin_lock(&blp->blp_lock);
2282                 list_add_tail(&blwi.blwi_entry, &blp->blp_list);
2283                 cfs_waitq_signal(&blp->blp_waitq);
2284                 spin_unlock(&blp->blp_lock);
2285
2286                 wait_for_completion(&blp->blp_comp);
2287         }
2288         OBD_FREE(blp, sizeof(*blp));
2289
2290         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2291         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2292         ldlm_proc_cleanup();
2293
2294         expired_lock_thread.elt_state = ELT_TERMINATE;
2295         cfs_waitq_signal(&expired_lock_thread.elt_waitq);
2296         wait_event(expired_lock_thread.elt_waitq,
2297                    expired_lock_thread.elt_state == ELT_STOPPED);
2298 #else
2299         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2300         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2301 #endif
2302
2303         OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2304         ldlm_state = NULL;
2305
2306         RETURN(0);
2307 }
2308
2309 int __init ldlm_init(void)
2310 {
2311         init_mutex(&ldlm_ref_sem);
2312         init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER));
2313         init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
2314         ldlm_resource_slab = cfs_mem_cache_create("ldlm_resources",
2315                                                sizeof(struct ldlm_resource), 0,
2316                                                SLAB_HWCACHE_ALIGN);
2317         if (ldlm_resource_slab == NULL)
2318                 return -ENOMEM;
2319
2320         ldlm_lock_slab = cfs_mem_cache_create("ldlm_locks",
2321                                            sizeof(struct ldlm_lock), 0,
2322                                            SLAB_HWCACHE_ALIGN);
2323         if (ldlm_lock_slab == NULL) {
2324                 cfs_mem_cache_destroy(ldlm_resource_slab);
2325                 return -ENOMEM;
2326         }
2327
2328         ldlm_interval_slab = cfs_mem_cache_create("interval_node",
2329                                         sizeof(struct ldlm_interval),
2330                                         0, SLAB_HWCACHE_ALIGN);
2331         if (ldlm_interval_slab == NULL) {
2332                 cfs_mem_cache_destroy(ldlm_resource_slab);
2333                 cfs_mem_cache_destroy(ldlm_lock_slab);
2334                 return -ENOMEM;
2335         }
2336
2337         return 0;
2338 }
2339
2340 void __exit ldlm_exit(void)
2341 {
2342         int rc;
2343         if (ldlm_refcount)
2344                 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
2345         rc = cfs_mem_cache_destroy(ldlm_resource_slab);
2346         LASSERTF(rc == 0, "couldn't free ldlm resource slab\n");
2347         rc = cfs_mem_cache_destroy(ldlm_lock_slab);
2348         LASSERTF(rc == 0, "couldn't free ldlm lock slab\n");
2349         rc = cfs_mem_cache_destroy(ldlm_interval_slab);
2350         LASSERTF(rc == 0, "couldn't free interval node slab\n");
2351 }
2352
2353 /* ldlm_extent.c */
2354 EXPORT_SYMBOL(ldlm_extent_shift_kms);
2355
2356 /* ldlm_lock.c */
2357 EXPORT_SYMBOL(ldlm_get_processing_policy);
2358 EXPORT_SYMBOL(ldlm_lock2desc);
2359 EXPORT_SYMBOL(ldlm_register_intent);
2360 EXPORT_SYMBOL(ldlm_lockname);
2361 EXPORT_SYMBOL(ldlm_typename);
2362 EXPORT_SYMBOL(ldlm_lock2handle);
2363 EXPORT_SYMBOL(__ldlm_handle2lock);
2364 EXPORT_SYMBOL(ldlm_lock_get);
2365 EXPORT_SYMBOL(ldlm_lock_put);
2366 EXPORT_SYMBOL(ldlm_lock_fast_match);
2367 EXPORT_SYMBOL(ldlm_lock_fast_release);
2368 EXPORT_SYMBOL(ldlm_lock_match);
2369 EXPORT_SYMBOL(ldlm_lock_cancel);
2370 EXPORT_SYMBOL(ldlm_lock_addref);
2371 EXPORT_SYMBOL(ldlm_lock_decref);
2372 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
2373 EXPORT_SYMBOL(ldlm_lock_change_resource);
2374 EXPORT_SYMBOL(ldlm_lock_set_data);
2375 EXPORT_SYMBOL(ldlm_it2str);
2376 EXPORT_SYMBOL(ldlm_lock_dump);
2377 EXPORT_SYMBOL(ldlm_lock_dump_handle);
2378 EXPORT_SYMBOL(ldlm_cancel_locks_for_export);
2379 EXPORT_SYMBOL(ldlm_reprocess_all_ns);
2380 EXPORT_SYMBOL(ldlm_lock_allow_match);
2381
2382 /* ldlm_request.c */
2383 EXPORT_SYMBOL(ldlm_completion_ast);
2384 EXPORT_SYMBOL(ldlm_blocking_ast);
2385 EXPORT_SYMBOL(ldlm_glimpse_ast);
2386 EXPORT_SYMBOL(ldlm_expired_completion_wait);
2387 EXPORT_SYMBOL(ldlm_prep_enqueue_req);
2388 EXPORT_SYMBOL(ldlm_prep_elc_req);
2389 EXPORT_SYMBOL(ldlm_cli_convert);
2390 EXPORT_SYMBOL(ldlm_cli_enqueue);
2391 EXPORT_SYMBOL(ldlm_cli_enqueue_fini);
2392 EXPORT_SYMBOL(ldlm_cli_enqueue_local);
2393 EXPORT_SYMBOL(ldlm_cli_cancel);
2394 EXPORT_SYMBOL(ldlm_cli_cancel_unused);
2395 EXPORT_SYMBOL(ldlm_cli_cancel_unused_resource);
2396 EXPORT_SYMBOL(ldlm_cli_cancel_req);
2397 EXPORT_SYMBOL(ldlm_cli_join_lru);
2398 EXPORT_SYMBOL(ldlm_replay_locks);
2399 EXPORT_SYMBOL(ldlm_resource_foreach);
2400 EXPORT_SYMBOL(ldlm_namespace_foreach);
2401 EXPORT_SYMBOL(ldlm_namespace_foreach_res);
2402 EXPORT_SYMBOL(ldlm_resource_iterate);
2403 EXPORT_SYMBOL(ldlm_cancel_resource_local);
2404 EXPORT_SYMBOL(ldlm_cli_cancel_list);
2405
2406 /* ldlm_lockd.c */
2407 EXPORT_SYMBOL(ldlm_server_blocking_ast);
2408 EXPORT_SYMBOL(ldlm_server_completion_ast);
2409 EXPORT_SYMBOL(ldlm_server_glimpse_ast);
2410 EXPORT_SYMBOL(ldlm_handle_enqueue);
2411 EXPORT_SYMBOL(ldlm_handle_enqueue0);
2412 EXPORT_SYMBOL(ldlm_handle_cancel);
2413 EXPORT_SYMBOL(ldlm_request_cancel);
2414 EXPORT_SYMBOL(ldlm_handle_convert);
2415 EXPORT_SYMBOL(ldlm_handle_convert0);
2416 EXPORT_SYMBOL(ldlm_del_waiting_lock);
2417 EXPORT_SYMBOL(ldlm_get_ref);
2418 EXPORT_SYMBOL(ldlm_put_ref);
2419 EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
2420 EXPORT_SYMBOL(ldlm_revoke_export_locks);
2421
2422 /* ldlm_resource.c */
2423 EXPORT_SYMBOL(ldlm_namespace_new);
2424 EXPORT_SYMBOL(ldlm_namespace_cleanup);
2425 EXPORT_SYMBOL(ldlm_namespace_free);
2426 EXPORT_SYMBOL(ldlm_namespace_dump);
2427 EXPORT_SYMBOL(ldlm_dump_all_namespaces);
2428 EXPORT_SYMBOL(ldlm_resource_get);
2429 EXPORT_SYMBOL(ldlm_resource_putref);
2430 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
2431
2432 /* ldlm_lib.c */
2433 EXPORT_SYMBOL(client_import_add_conn);
2434 EXPORT_SYMBOL(client_import_del_conn);
2435 EXPORT_SYMBOL(client_obd_setup);
2436 EXPORT_SYMBOL(client_obd_cleanup);
2437 EXPORT_SYMBOL(client_connect_import);
2438 EXPORT_SYMBOL(client_disconnect_export);
2439 EXPORT_SYMBOL(target_start_recovery_thread);
2440 EXPORT_SYMBOL(target_stop_recovery_thread);
2441 EXPORT_SYMBOL(target_handle_connect);
2442 EXPORT_SYMBOL(target_cleanup_recovery);
2443 EXPORT_SYMBOL(target_destroy_export);
2444 EXPORT_SYMBOL(target_cancel_recovery_timer);
2445 EXPORT_SYMBOL(target_send_reply);
2446 EXPORT_SYMBOL(target_queue_recovery_request);
2447 EXPORT_SYMBOL(target_handle_ping);
2448 EXPORT_SYMBOL(target_pack_pool_reply);
2449 EXPORT_SYMBOL(target_handle_disconnect);
2450
2451 /* l_lock.c */
2452 EXPORT_SYMBOL(lock_res_and_lock);
2453 EXPORT_SYMBOL(unlock_res_and_lock);