lustre/ldlm/ldlm_lockd.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 2002-2004 Cluster File Systems, Inc.
   5  *   Author: Peter Braam <braam@clusterfs.com>
   6  *   Author: Phil Schwan <phil@clusterfs.com>
   7  *
   8  *   This file is part of the Lustre file system, http://www.lustre.org
   9  *   Lustre is a trademark of Cluster File Systems, Inc.
  10  *
  11  *   You may have signed or agreed to another license before downloading
  12  *   this software.  If so, you are bound by the terms and conditions
  13  *   of that agreement, and the following does not apply to you.  See the
  14  *   LICENSE file included with this distribution for more information.
  15  *
  16  *   If you did not agree to a different license, then this copy of Lustre
  17  *   is open source software; you can redistribute it and/or modify it
  18  *   under the terms of version 2 of the GNU General Public License as
  19  *   published by the Free Software Foundation.
  20  *
  21  *   In either case, Lustre is distributed in the hope that it will be
  22  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  23  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  *   license text for more details.
  25  */
  26
  27 #ifndef EXPORT_SYMTAB
  28 # define EXPORT_SYMTAB
  29 #endif
  30 #define DEBUG_SUBSYSTEM S_LDLM
  31
  32 #ifdef __KERNEL__
  33 # include <libcfs/libcfs.h>
  34 #else
  35 # include <liblustre.h>
  36 #endif
  37
  38 #include <lustre_dlm.h>
  39 #include <obd_class.h>
  40 #include <libcfs/list.h>
  41 #include "ldlm_internal.h"
  42
  43 extern cfs_mem_cache_t *ldlm_resource_slab;
  44 extern cfs_mem_cache_t *ldlm_lock_slab;
  45 static struct semaphore ldlm_ref_sem;
  46 static int ldlm_refcount;
  47
  48 /* LDLM state */
  49
  50 static struct ldlm_state *ldlm_state;
  51
  52 inline cfs_time_t round_timeout(cfs_time_t timeout)
  53 {
  54         return cfs_time_seconds((int)cfs_duration_sec(cfs_time_sub(timeout, 0)) + 1);
  55 }
  56
  57 /* timeout for initial callback (AST) reply */
  58 static inline unsigned int ldlm_get_rq_timeout(unsigned int ldlm_timeout,
  59                                                unsigned int obd_timeout)
  60 {
  61         unsigned int timeout = min(ldlm_timeout, obd_timeout / 3);
  62
  63         return timeout < 1 ? 1 : timeout;
  64 }
  65
  66 #ifdef __KERNEL__
  67 /* w_l_spinlock protects both waiting_locks_list and expired_lock_thread */
  68 static spinlock_t waiting_locks_spinlock;   /* BH lock (timer) */
  69 static struct list_head waiting_locks_list;
  70 static cfs_timer_t waiting_locks_timer;
  71
  72 static struct expired_lock_thread {
  73         cfs_waitq_t               elt_waitq;
  74         int                       elt_state;
  75         int                       elt_dump;
  76         struct list_head          elt_expired_locks;
  77 } expired_lock_thread;
  78 #endif
  79
  80 #define ELT_STOPPED   0
  81 #define ELT_READY     1
  82 #define ELT_TERMINATE 2
  83
  84 struct ldlm_bl_pool {
  85         spinlock_t              blp_lock;
  86         struct list_head        blp_list;
  87         cfs_waitq_t             blp_waitq;
  88         atomic_t                blp_num_threads;
  89         struct completion       blp_comp;
  90 };
  91
  92 struct ldlm_bl_work_item {
  93         struct list_head        blwi_entry;
  94         struct ldlm_namespace   *blwi_ns;
  95         struct ldlm_lock_desc   blwi_ld;
  96         struct ldlm_lock        *blwi_lock;
  97         struct list_head        blwi_head;
  98         int                     blwi_count;
  99 };
 100
 101 #ifdef __KERNEL__
 102
 103 static inline int have_expired_locks(void)
 104 {
 105         int need_to_run;
 106
 107         ENTRY;
 108         spin_lock_bh(&waiting_locks_spinlock);
 109         need_to_run = !list_empty(&expired_lock_thread.elt_expired_locks);
 110         spin_unlock_bh(&waiting_locks_spinlock);
 111
 112         RETURN(need_to_run);
 113 }
 114
 115 static int expired_lock_main(void *arg)
 116 {
 117         struct list_head *expired = &expired_lock_thread.elt_expired_locks;
 118         struct l_wait_info lwi = { 0 };
 119         int do_dump;
 120
 121         ENTRY;
 122         cfs_daemonize("ldlm_elt");
 123
 124         expired_lock_thread.elt_state = ELT_READY;
 125         cfs_waitq_signal(&expired_lock_thread.elt_waitq);
 126
 127         while (1) {
 128                 l_wait_event(expired_lock_thread.elt_waitq,
 129                              have_expired_locks() ||
 130                              expired_lock_thread.elt_state == ELT_TERMINATE,
 131                              &lwi);
 132
 133                 spin_lock_bh(&waiting_locks_spinlock);
 134                 if (expired_lock_thread.elt_dump) {
 135                         spin_unlock_bh(&waiting_locks_spinlock);
 136
 137                         /* from waiting_locks_callback, but not in timer */
 138                         libcfs_debug_dumplog();
 139                         libcfs_run_lbug_upcall(__FILE__,
 140                                                 "waiting_locks_callback",
 141                                                 expired_lock_thread.elt_dump);
 142
 143                         spin_lock_bh(&waiting_locks_spinlock);
 144                         expired_lock_thread.elt_dump = 0;
 145                 }
 146
 147                 do_dump = 0;
 148
 149                 while (!list_empty(expired)) {
 150                         struct obd_export *export;
 151                         struct ldlm_lock *lock;
 152
 153                         lock = list_entry(expired->next, struct ldlm_lock,
 154                                           l_pending_chain);
 155                         if ((void *)lock < LP_POISON + CFS_PAGE_SIZE &&
 156                             (void *)lock >= LP_POISON) {
 157                                 spin_unlock_bh(&waiting_locks_spinlock);
 158                                 CERROR("free lock on elt list %p\n", lock);
 159                                 LBUG();
 160                         }
 161                         list_del_init(&lock->l_pending_chain);
 162                         if ((void *)lock->l_export < LP_POISON + CFS_PAGE_SIZE &&
 163                             (void *)lock->l_export >= LP_POISON) {
 164                                 CERROR("lock with free export on elt list %p\n",
 165                                        lock->l_export);
 166                                 lock->l_export = NULL;
 167                                 LDLM_ERROR(lock, "free export");
 168                                 continue;
 169                         }
 170                         export = class_export_get(lock->l_export);
 171                         spin_unlock_bh(&waiting_locks_spinlock);
 172
 173                         do_dump++;
 174                         class_fail_export(export);
 175                         class_export_put(export);
 176                         spin_lock_bh(&waiting_locks_spinlock);
 177                 }
 178                 spin_unlock_bh(&waiting_locks_spinlock);
 179
 180                 if (do_dump && obd_dump_on_eviction) {
 181                         CERROR("dump the log upon eviction\n");
 182                         libcfs_debug_dumplog();
 183                 }
 184
 185                 if (expired_lock_thread.elt_state == ELT_TERMINATE)
 186                         break;
 187         }
 188
 189         expired_lock_thread.elt_state = ELT_STOPPED;
 190         cfs_waitq_signal(&expired_lock_thread.elt_waitq);
 191         RETURN(0);
 192 }
 193
 194 static int ldlm_add_waiting_lock(struct ldlm_lock *lock);
 195
 196 /* This is called from within a timer interrupt and cannot schedule */
 197 static void waiting_locks_callback(unsigned long unused)
 198 {
 199         struct ldlm_lock *lock, *last = NULL;
 200
 201 repeat:
 202         spin_lock_bh(&waiting_locks_spinlock);
 203         while (!list_empty(&waiting_locks_list)) {
 204                 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
 205                                   l_pending_chain);
 206
 207                 if (cfs_time_after(lock->l_callback_timeout, cfs_time_current()) ||
 208                     (lock->l_req_mode == LCK_GROUP))
 209                         break;
 210
 211                 if (ptlrpc_check_suspend()) {
 212                         /* there is a case when we talk to one mds, holding
 213                          * lock from another mds. this way we easily can get
 214                          * here, if second mds is being recovered. so, we
 215                          * suspend timeouts. bug 6019 */
 216
 217                         LDLM_ERROR(lock, "recharge timeout: %s@%s nid %s ",
 218                                    lock->l_export->exp_client_uuid.uuid,
 219                                    lock->l_export->exp_connection->c_remote_uuid.uuid,
 220                                    libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
 221
 222                         list_del_init(&lock->l_pending_chain);
 223                         spin_unlock_bh(&waiting_locks_spinlock);
 224                         ldlm_add_waiting_lock(lock);
 225                         goto repeat;
 226                 }
 227
 228                 /* if timeout overlaps the activation time of suspended timeouts
 229                  * then extend it to give a chance for client to reconnect */
 230                 if (cfs_time_before(cfs_time_sub(lock->l_callback_timeout,
 231                                                  cfs_time_seconds(obd_timeout)/2),
 232                                     ptlrpc_suspend_wakeup_time())) {
 233                         LDLM_ERROR(lock, "extend timeout due to recovery: %s@%s nid %s ",
 234                                    lock->l_export->exp_client_uuid.uuid,
 235                                    lock->l_export->exp_connection->c_remote_uuid.uuid,
 236                                    libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
 237
 238                         list_del_init(&lock->l_pending_chain);
 239                         spin_unlock_bh(&waiting_locks_spinlock);
 240                         ldlm_add_waiting_lock(lock);
 241                         goto repeat;
 242                 }
 243
 244                 LDLM_ERROR(lock, "lock callback timer expired: evicting client "
 245                            "%s@%s nid %s\n",
 246                            lock->l_export->exp_client_uuid.uuid,
 247                            lock->l_export->exp_connection->c_remote_uuid.uuid,
 248                            libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
 249
 250                 last = lock;
 251
 252                 list_del(&lock->l_pending_chain);
 253                 list_add(&lock->l_pending_chain,
 254                          &expired_lock_thread.elt_expired_locks);
 255         }
 256
 257         if (!list_empty(&expired_lock_thread.elt_expired_locks)) {
 258                 if (obd_dump_on_timeout)
 259                         expired_lock_thread.elt_dump = __LINE__;
 260
 261                 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
 262         }
 263
 264         /*
 265          * Make sure the timer will fire again if we have any locks
 266          * left.
 267          */
 268         if (!list_empty(&waiting_locks_list)) {
 269                 cfs_time_t timeout_rounded;
 270                 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
 271                                   l_pending_chain);
 272                 timeout_rounded = (cfs_time_t)round_timeout(lock->l_callback_timeout);
 273                 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
 274         }
 275         spin_unlock_bh(&waiting_locks_spinlock);
 276 }
 277
 278 /*
 279  * Indicate that we're waiting for a client to call us back cancelling a given
 280  * lock.  We add it to the pending-callback chain, and schedule the lock-timeout
 281  * timer to fire appropriately.  (We round up to the next second, to avoid
 282  * floods of timer firings during periods of high lock contention and traffic).
 283  *
 284  * Called with the namespace lock held.
 285  */
 286 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock)
 287 {
 288         cfs_time_t timeout_rounded;
 289
 290         if (!list_empty(&lock->l_pending_chain))
 291                 return 0;
 292
 293         lock->l_callback_timeout =cfs_time_add(cfs_time_current(),
 294                                                cfs_time_seconds(obd_timeout)/2);
 295
 296         timeout_rounded = round_timeout(lock->l_callback_timeout);
 297
 298         if (cfs_time_before(timeout_rounded, cfs_timer_deadline(&waiting_locks_timer)) ||
 299             !cfs_timer_is_armed(&waiting_locks_timer)) {
 300                 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
 301
 302         }
 303         list_add_tail(&lock->l_pending_chain, &waiting_locks_list); /* FIFO */
 304         return 1;
 305 }
 306
 307 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
 308 {
 309         int ret;
 310
 311         LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK));
 312
 313         spin_lock_bh(&waiting_locks_spinlock);
 314         if (lock->l_destroyed) {
 315                 static cfs_time_t next;
 316                 spin_unlock_bh(&waiting_locks_spinlock);
 317                 LDLM_ERROR(lock, "not waiting on destroyed lock (bug 5653)");
 318                 if (cfs_time_after(cfs_time_current(), next)) {
 319                         next = cfs_time_shift(14400);
 320                         libcfs_debug_dumpstack(NULL);
 321                 }
 322                 return 0;
 323         }
 324
 325         ret = __ldlm_add_waiting_lock(lock);
 326         spin_unlock_bh(&waiting_locks_spinlock);
 327
 328         LDLM_DEBUG(lock, "%sadding to wait list",
 329                    ret == 0 ? "not re-" : "");
 330         return ret;
 331 }
 332
 333 /*
 334  * Remove a lock from the pending list, likely because it had its cancellation
 335  * callback arrive without incident.  This adjusts the lock-timeout timer if
 336  * needed.  Returns 0 if the lock wasn't pending after all, 1 if it was.
 337  *
 338  * Called with namespace lock held.
 339  */
 340 int __ldlm_del_waiting_lock(struct ldlm_lock *lock)
 341 {
 342         struct list_head *list_next;
 343
 344         if (list_empty(&lock->l_pending_chain))
 345                 return 0;
 346
 347         list_next = lock->l_pending_chain.next;
 348         if (lock->l_pending_chain.prev == &waiting_locks_list) {
 349                 /* Removing the head of the list, adjust timer. */
 350                 if (list_next == &waiting_locks_list) {
 351                         /* No more, just cancel. */
 352                         cfs_timer_disarm(&waiting_locks_timer);
 353                 } else {
 354                         struct ldlm_lock *next;
 355                         next = list_entry(list_next, struct ldlm_lock,
 356                                           l_pending_chain);
 357                         cfs_timer_arm(&waiting_locks_timer,
 358                                       round_timeout(next->l_callback_timeout));
 359                 }
 360         }
 361         list_del_init(&lock->l_pending_chain);
 362
 363         return 1;
 364 }
 365
 366 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
 367 {
 368         int ret;
 369
 370         if (lock->l_export == NULL) {
 371                 /* We don't have a "waiting locks list" on clients. */
 372                 LDLM_DEBUG(lock, "client lock: no-op");
 373                 return 0;
 374         }
 375
 376         spin_lock_bh(&waiting_locks_spinlock);
 377         ret = __ldlm_del_waiting_lock(lock);
 378         spin_unlock_bh(&waiting_locks_spinlock);
 379
 380         LDLM_DEBUG(lock, "%s", ret == 0 ? "wasn't waiting" : "removed");
 381         return ret;
 382 }
 383
 384 /*
 385  * Prolong the lock
 386  *
 387  * Called with namespace lock held.
 388  */
 389 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock)
 390 {
 391         if (lock->l_export == NULL) {
 392                 /* We don't have a "waiting locks list" on clients. */
 393                 LDLM_DEBUG(lock, "client lock: no-op");
 394                 return 0;
 395         }
 396
 397         spin_lock_bh(&waiting_locks_spinlock);
 398
 399         if (list_empty(&lock->l_pending_chain)) {
 400                 spin_unlock_bh(&waiting_locks_spinlock);
 401                 LDLM_DEBUG(lock, "wasn't waiting");
 402                 return 0;
 403         }
 404
 405         __ldlm_del_waiting_lock(lock);
 406         __ldlm_add_waiting_lock(lock);
 407         spin_unlock_bh(&waiting_locks_spinlock);
 408
 409         LDLM_DEBUG(lock, "refreshed");
 410         return 1;
 411 }
 412
 413 #else /* !__KERNEL__ */
 414
 415 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
 416 {
 417         LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK));
 418         RETURN(1);
 419 }
 420
 421 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
 422 {
 423         RETURN(0);
 424 }
 425
 426 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock)
 427 {
 428         RETURN(0);
 429 }
 430 #endif /* __KERNEL__ */
 431
 432 static void ldlm_failed_ast(struct ldlm_lock *lock, int rc,
 433                             const char *ast_type)
 434 {
 435         struct ptlrpc_connection *conn = lock->l_export->exp_connection;
 436         char                     *str = libcfs_nid2str(conn->c_peer.nid);
 437
 438         LCONSOLE_ERROR_MSG(0x138, "A client on nid %s was evicted from "
 439                            "service %s.\n", str,
 440                            lock->l_export->exp_obd->obd_name);
 441
 442         LCONSOLE_ERROR_MSG(0x012, "Lock %s callback to %s timed out for "
 443                            "resource %d\n", ast_type,
 444                            obd_export_nid2str(lock->l_export), rc);
 445
 446         if (obd_dump_on_timeout)
 447                 libcfs_debug_dumplog();
 448         class_fail_export(lock->l_export);
 449 }
 450
 451 static int ldlm_handle_ast_error(struct ldlm_lock *lock,
 452                                  struct ptlrpc_request *req, int rc,
 453                                  const char *ast_type)
 454 {
 455         lnet_process_id_t peer = req->rq_import->imp_connection->c_peer;
 456
 457         if (rc == -ETIMEDOUT || rc == -EINTR || rc == -ENOTCONN) {
 458                 LASSERT(lock->l_export);
 459                 if (lock->l_export->exp_libclient) {
 460                         LDLM_DEBUG(lock, "%s AST to liblustre client (nid %s)"
 461                                    " timeout, just cancelling lock", ast_type,
 462                                    libcfs_nid2str(peer.nid));
 463                         ldlm_lock_cancel(lock);
 464                         rc = -ERESTART;
 465                 } else if (lock->l_flags & LDLM_FL_CANCEL) {
 466                         LDLM_DEBUG(lock, "%s AST timeout from nid %s, but "
 467                                    "cancel was received (AST reply lost?)",
 468                                    ast_type, libcfs_nid2str(peer.nid));
 469                         ldlm_lock_cancel(lock);
 470                         rc = -ERESTART;
 471                 } else {
 472                         ldlm_del_waiting_lock(lock);
 473                         ldlm_failed_ast(lock, rc, ast_type);
 474                 }
 475         } else if (rc) {
 476                 if (rc == -EINVAL)
 477                         LDLM_DEBUG(lock, "client (nid %s) returned %d"
 478                                " from %s AST - normal race",
 479                                libcfs_nid2str(peer.nid),
 480                                req->rq_repmsg ?
 481                                lustre_msg_get_status(req->rq_repmsg) : -1,
 482                                ast_type);
 483                 else
 484                         LDLM_ERROR(lock, "client (nid %s) returned %d "
 485                                    "from %s AST", libcfs_nid2str(peer.nid),
 486                                    (req->rq_repmsg != NULL) ?
 487                                    lustre_msg_get_status(req->rq_repmsg) : 0,
 488                                    ast_type);
 489                 ldlm_lock_cancel(lock);
 490                 /* Server-side AST functions are called from ldlm_reprocess_all,
 491                  * which needs to be told to please restart its reprocessing. */
 492                 rc = -ERESTART;
 493         }
 494
 495         return rc;
 496 }
 497
 498 static int ldlm_cb_interpret(struct ptlrpc_request *req, void *data, int rc)
 499 {
 500         struct ldlm_cb_set_arg *arg;
 501         struct ldlm_lock *lock;
 502         ENTRY;
 503
 504         LASSERT(data != NULL);
 505
 506         arg = req->rq_async_args.pointer_arg[0];
 507         lock = req->rq_async_args.pointer_arg[1];
 508         LASSERT(lock != NULL);
 509         if (rc != 0) {
 510                 /* If client canceled the lock but the cancel has not
 511                  * been recieved yet, we need to update lvbo to have the
 512                  * proper attributes cached. */
 513                 if (rc == -EINVAL && arg->type == LDLM_BL_CALLBACK)
 514                         ldlm_res_lvbo_update(lock->l_resource, NULL,
 515                                              0, 1);
 516                 rc = ldlm_handle_ast_error(lock, req, rc,
 517                                            arg->type == LDLM_BL_CALLBACK
 518                                            ? "blocking" : "completion");
 519         }
 520
 521         LDLM_LOCK_PUT(lock);
 522
 523         if (rc == -ERESTART)
 524                 atomic_set(&arg->restart, 1);
 525
 526         RETURN(0);
 527 }
 528
 529 static inline int ldlm_bl_and_cp_ast_fini(struct ptlrpc_request *req,
 530                                           struct ldlm_cb_set_arg *arg,
 531                                           struct ldlm_lock *lock,
 532                                           int instant_cancel)
 533 {
 534         int rc = 0;
 535         ENTRY;
 536
 537         if (unlikely(instant_cancel)) {
 538                 rc = ptl_send_rpc(req, 1);
 539                 ptlrpc_req_finished(req);
 540                 if (rc == 0)
 541                         /* If we cancelled the lock, we need to restart
 542                          * ldlm_reprocess_queue */
 543                         atomic_set(&arg->restart, 1);
 544         } else {
 545                 LDLM_LOCK_GET(lock);
 546                 ptlrpc_set_add_req(arg->set, req);
 547         }
 548
 549         RETURN(rc);
 550 }
 551
 552 /*
 553  * ->l_blocking_ast() method for server-side locks. This is invoked when newly
 554  * enqueued server lock conflicts with given one.
 555  *
 556  * Sends blocking ast rpc to the client owning that lock; arms timeout timer
 557  * to wait for client response.
 558  */
 559 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
 560                              struct ldlm_lock_desc *desc,
 561                              void *data, int flag)
 562 {
 563         struct ldlm_cb_set_arg *arg = (struct ldlm_cb_set_arg *)data;
 564         struct ldlm_request *body;
 565         struct ptlrpc_request *req;
 566         int size[] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
 567                        [DLM_LOCKREQ_OFF]     = sizeof(*body) };
 568         int instant_cancel = 0, rc;
 569         ENTRY;
 570
 571         if (flag == LDLM_CB_CANCELING) {
 572                 /* Don't need to do anything here. */
 573                 RETURN(0);
 574         }
 575
 576         LASSERT(lock);
 577         LASSERT(data != NULL);
 578         if (lock->l_export->exp_obd->obd_recovering != 0) {
 579                 LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
 580                 ldlm_lock_dump(D_ERROR, lock, 0);
 581         }
 582
 583         req = ptlrpc_prep_req(lock->l_export->exp_imp_reverse,
 584                               LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK, 2, size,
 585                               NULL);
 586         if (req == NULL)
 587                 RETURN(-ENOMEM);
 588
 589         req->rq_async_args.pointer_arg[0] = arg;
 590         req->rq_async_args.pointer_arg[1] = lock;
 591         req->rq_interpret_reply = ldlm_cb_interpret;
 592         req->rq_no_resend = 1;
 593
 594         lock_res(lock->l_resource);
 595         if (lock->l_granted_mode != lock->l_req_mode) {
 596                 /* this blocking AST will be communicated as part of the
 597                  * completion AST instead */
 598                 unlock_res(lock->l_resource);
 599                 ptlrpc_req_finished(req);
 600                 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
 601                 RETURN(0);
 602         }
 603
 604         if (lock->l_destroyed) {
 605                 /* What's the point? */
 606                 unlock_res(lock->l_resource);
 607                 ptlrpc_req_finished(req);
 608                 RETURN(0);
 609         }
 610
 611         if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
 612                 instant_cancel = 1;
 613
 614         body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
 615         body->lock_handle[0] = lock->l_remote_handle;
 616         body->lock_desc = *desc;
 617         body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
 618
 619         LDLM_DEBUG(lock, "server preparing blocking AST");
 620
 621         ptlrpc_req_set_repsize(req, 1, NULL);
 622         if (instant_cancel) {
 623                 unlock_res(lock->l_resource);
 624                 ldlm_lock_cancel(lock);
 625         } else {
 626                 LASSERT(lock->l_granted_mode == lock->l_req_mode);
 627                 ldlm_add_waiting_lock(lock);
 628                 unlock_res(lock->l_resource);
 629         }
 630
 631         req->rq_send_state = LUSTRE_IMP_FULL;
 632         req->rq_timeout = ldlm_get_rq_timeout(ldlm_timeout, obd_timeout);
 633
 634         if (lock->l_export && lock->l_export->exp_ldlm_stats)
 635                 lprocfs_counter_incr(lock->l_export->exp_ldlm_stats,
 636                                      LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
 637
 638         rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
 639
 640         RETURN(rc);
 641 }
 642
 643 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data)
 644 {
 645         struct ldlm_cb_set_arg *arg = (struct ldlm_cb_set_arg *)data;
 646         struct ldlm_request *body;
 647         struct ptlrpc_request *req;
 648         struct timeval granted_time;
 649         long total_enqueue_wait;
 650         int size[3] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
 651                         [DLM_LOCKREQ_OFF]     = sizeof(*body) };
 652         int rc, buffers = 2, instant_cancel = 0;
 653         ENTRY;
 654
 655         LASSERT(lock != NULL);
 656         LASSERT(data != NULL);
 657
 658         do_gettimeofday(&granted_time);
 659         total_enqueue_wait = cfs_timeval_sub(&granted_time,
 660                                              &lock->l_enqueued_time, NULL);
 661
 662         if (total_enqueue_wait / 1000000 > obd_timeout)
 663                 LDLM_ERROR(lock, "enqueue wait took %luus from %lu",
 664                            total_enqueue_wait, lock->l_enqueued_time.tv_sec);
 665
 666         lock_res_and_lock(lock);
 667         if (lock->l_resource->lr_lvb_len) {
 668                 size[DLM_REQ_REC_OFF] = lock->l_resource->lr_lvb_len;
 669                 buffers = 3;
 670         }
 671         unlock_res_and_lock(lock);
 672
 673         req = ptlrpc_prep_req(lock->l_export->exp_imp_reverse,
 674                               LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK, buffers,
 675                               size, NULL);
 676         if (req == NULL)
 677                 RETURN(-ENOMEM);
 678
 679         req->rq_async_args.pointer_arg[0] = arg;
 680         req->rq_async_args.pointer_arg[1] = lock;
 681         req->rq_interpret_reply = ldlm_cb_interpret;
 682         req->rq_no_resend = 1;
 683
 684         body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
 685         body->lock_handle[0] = lock->l_remote_handle;
 686         body->lock_flags = flags;
 687         ldlm_lock2desc(lock, &body->lock_desc);
 688
 689         if (buffers == 3) {
 690                 void *lvb;
 691
 692                 lvb = lustre_msg_buf(req->rq_reqmsg, DLM_REQ_REC_OFF,
 693                                      lock->l_resource->lr_lvb_len);
 694                 lock_res_and_lock(lock);
 695                 memcpy(lvb, lock->l_resource->lr_lvb_data,
 696                        lock->l_resource->lr_lvb_len);
 697                 unlock_res_and_lock(lock);
 698         }
 699
 700         LDLM_DEBUG(lock, "server preparing completion AST (after %ldus wait)",
 701                    total_enqueue_wait);
 702
 703         ptlrpc_req_set_repsize(req, 1, NULL);
 704
 705         req->rq_send_state = LUSTRE_IMP_FULL;
 706         req->rq_timeout = ldlm_get_rq_timeout(ldlm_timeout, obd_timeout);
 707
 708         /* We only send real blocking ASTs after the lock is granted */
 709         lock_res_and_lock(lock);
 710         if (lock->l_flags & LDLM_FL_AST_SENT) {
 711                 body->lock_flags |= LDLM_FL_AST_SENT;
 712
 713                 /* We might get here prior to ldlm_handle_enqueue setting
 714                  * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
 715                  * into waiting list, but this is safe and similar code in
 716                  * ldlm_handle_enqueue will call ldlm_lock_cancel() still,
 717                  * that would not only cancel the lock, but will also remove
 718                  * it from waiting list */
 719                 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
 720                         unlock_res_and_lock(lock);
 721                         ldlm_lock_cancel(lock);
 722                         instant_cancel = 1;
 723                         lock_res_and_lock(lock);
 724                 } else {
 725                         /* start the lock-timeout clock */
 726                         ldlm_add_waiting_lock(lock);
 727                 }
 728         }
 729         unlock_res_and_lock(lock);
 730
 731         if (lock->l_export && lock->l_export->exp_ldlm_stats)
 732                 lprocfs_counter_incr(lock->l_export->exp_ldlm_stats,
 733                                      LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
 734
 735         rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
 736
 737         RETURN(rc);
 738 }
 739
 740 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
 741 {
 742         struct ldlm_resource *res = lock->l_resource;
 743         struct ldlm_request *body;
 744         struct ptlrpc_request *req;
 745         int size[] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
 746                        [DLM_LOCKREQ_OFF]     = sizeof(*body) };
 747         int rc = 0;
 748         ENTRY;
 749
 750         LASSERT(lock != NULL);
 751
 752         req = ptlrpc_prep_req(lock->l_export->exp_imp_reverse,
 753                               LUSTRE_DLM_VERSION, LDLM_GL_CALLBACK, 2, size,
 754                               NULL);
 755         if (req == NULL)
 756                 RETURN(-ENOMEM);
 757
 758         body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body));
 759         body->lock_handle[0] = lock->l_remote_handle;
 760         ldlm_lock2desc(lock, &body->lock_desc);
 761
 762         lock_res_and_lock(lock);
 763         size[REPLY_REC_OFF] = lock->l_resource->lr_lvb_len;
 764         unlock_res_and_lock(lock);
 765         res = lock->l_resource;
 766         ptlrpc_req_set_repsize(req, 2, size);
 767
 768         req->rq_send_state = LUSTRE_IMP_FULL;
 769         req->rq_timeout = ldlm_get_rq_timeout(ldlm_timeout, obd_timeout);
 770
 771         if (lock->l_export && lock->l_export->exp_ldlm_stats)
 772                 lprocfs_counter_incr(lock->l_export->exp_ldlm_stats,
 773                                      LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
 774
 775         rc = ptlrpc_queue_wait(req);
 776         if (rc == -ELDLM_NO_LOCK_DATA)
 777                 LDLM_DEBUG(lock, "lost race - client has a lock but no inode");
 778         else if (rc != 0)
 779                 rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
 780         else
 781                 rc = ldlm_res_lvbo_update(res, req->rq_repmsg,
 782                                           REPLY_REC_OFF, 1);
 783         ptlrpc_req_finished(req);
 784         RETURN(rc);
 785 }
 786
 787 static struct ldlm_lock *
 788 find_existing_lock(struct obd_export *exp,
 789                    const struct lustre_handle *remote_hdl)
 790 {
 791         struct list_head *iter;
 792
 793         spin_lock(&exp->exp_ldlm_data.led_lock);
 794         list_for_each(iter, &exp->exp_ldlm_data.led_held_locks) {
 795                 struct ldlm_lock *lock;
 796                 lock = list_entry(iter, struct ldlm_lock, l_export_chain);
 797                 if (lock->l_remote_handle.cookie == remote_hdl->cookie) {
 798                         LDLM_LOCK_GET(lock);
 799                         spin_unlock(&exp->exp_ldlm_data.led_lock);
 800                         return lock;
 801                 }
 802         }
 803         spin_unlock(&exp->exp_ldlm_data.led_lock);
 804         return NULL;
 805 }
 806
 807 #ifdef __KERNEL__
 808 extern unsigned long long lu_time_stamp_get(void);
 809 #else
 810 #define lu_time_stamp_get() time(NULL)
 811 #endif
 812
 813 /*
 814  * Main server-side entry point into LDLM. This is called by ptlrpc service
 815  * threads to carry out client lock enqueueing requests.
 816  */
 817 int ldlm_handle_enqueue0(struct ldlm_namespace *ns,
 818                          struct ptlrpc_request *req,
 819                          const struct ldlm_request *dlm_req,
 820                          const struct ldlm_callback_suite *cbs)
 821 {
 822         struct ldlm_reply *dlm_rep;
 823         int size[3] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
 824                         [DLM_LOCKREPLY_OFF]   = sizeof(*dlm_rep) };
 825         int rc = 0;
 826         __u32 flags;
 827         ldlm_error_t err = ELDLM_OK;
 828         struct ldlm_lock *lock = NULL;
 829         void *cookie = NULL;
 830         ENTRY;
 831
 832         LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
 833
 834         ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF);
 835         flags = dlm_req->lock_flags;
 836
 837         LASSERT(req->rq_export);
 838
 839         if (req->rq_export->exp_ldlm_stats)
 840                 lprocfs_counter_incr(req->rq_export->exp_ldlm_stats,
 841                                      LDLM_ENQUEUE - LDLM_FIRST_OPC);
 842
 843         if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE ||
 844                      dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) {
 845                 DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
 846                           dlm_req->lock_desc.l_resource.lr_type);
 847                 GOTO(out, rc = -EFAULT);
 848         }
 849
 850         if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE ||
 851                      dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE ||
 852                      dlm_req->lock_desc.l_req_mode &
 853                      (dlm_req->lock_desc.l_req_mode-1))) {
 854                 DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
 855                           dlm_req->lock_desc.l_req_mode);
 856                 GOTO(out, rc = -EFAULT);
 857         }
 858
 859         if (req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) {
 860                 if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
 861                              LDLM_PLAIN)) {
 862                         DEBUG_REQ(D_ERROR, req,
 863                                   "PLAIN lock request from IBITS client?");
 864                         GOTO(out, rc = -EPROTO);
 865                 }
 866         } else if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
 867                             LDLM_IBITS)) {
 868                 DEBUG_REQ(D_ERROR, req,
 869                           "IBITS lock request from unaware client?");
 870                 GOTO(out, rc = -EPROTO);
 871         }
 872
 873 #if 0
 874         /* FIXME this makes it impossible to use LDLM_PLAIN locks -- check
 875            against server's _CONNECT_SUPPORTED flags? (I don't want to use
 876            ibits for mgc/mgs) */
 877
 878         /* INODEBITS_INTEROP: Perform conversion from plain lock to
 879          * inodebits lock if client does not support them. */
 880         if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) &&
 881             (dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN)) {
 882                 dlm_req->lock_desc.l_resource.lr_type = LDLM_IBITS;
 883                 dlm_req->lock_desc.l_policy_data.l_inodebits.bits =
 884                         MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE;
 885                 if (dlm_req->lock_desc.l_req_mode == LCK_PR)
 886                         dlm_req->lock_desc.l_req_mode = LCK_CR;
 887         }
 888 #endif
 889
 890         if (unlikely(flags & LDLM_FL_REPLAY)) {
 891                 lock = find_existing_lock(req->rq_export,
 892                                           &dlm_req->lock_handle[0]);
 893                 if (lock != NULL) {
 894                         DEBUG_REQ(D_DLMTRACE, req, "found existing lock cookie "
 895                                   LPX64, lock->l_handle.h_cookie);
 896                         GOTO(existing_lock, rc = 0);
 897                 }
 898         }
 899
 900         /* The lock's callback data might be set in the policy function */
 901         lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
 902                                 dlm_req->lock_desc.l_resource.lr_type,
 903                                 dlm_req->lock_desc.l_req_mode,
 904                                 cbs->lcs_blocking, cbs->lcs_completion,
 905                                 cbs->lcs_glimpse, NULL, 0);
 906
 907         if (!lock)
 908                 GOTO(out, rc = -ENOMEM);
 909
 910         do_gettimeofday(&lock->l_enqueued_time);
 911         lock->l_remote_handle = dlm_req->lock_handle[0];
 912         LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
 913
 914         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
 915         /* Don't enqueue a lock onto the export if it has already
 916          * been evicted.  Cancel it now instead. (bug 3822) */
 917         if (req->rq_export->exp_failed) {
 918                 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
 919                 GOTO(out, rc = -ENOTCONN);
 920         }
 921         lock->l_export = class_export_get(req->rq_export);
 922         spin_lock(&lock->l_export->exp_ldlm_data.led_lock);
 923         list_add(&lock->l_export_chain,
 924                  &lock->l_export->exp_ldlm_data.led_held_locks);
 925         spin_unlock(&lock->l_export->exp_ldlm_data.led_lock);
 926
 927 existing_lock:
 928
 929         if (flags & LDLM_FL_HAS_INTENT) {
 930                 /* In this case, the reply buffer is allocated deep in
 931                  * local_lock_enqueue by the policy function. */
 932                 cookie = req;
 933         } else {
 934                 int buffers = 2;
 935
 936                 lock_res_and_lock(lock);
 937                 if (lock->l_resource->lr_lvb_len) {
 938                         size[DLM_REPLY_REC_OFF] = lock->l_resource->lr_lvb_len;
 939                         buffers = 3;
 940                 }
 941                 unlock_res_and_lock(lock);
 942
 943                 if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
 944                         GOTO(out, rc = -ENOMEM);
 945
 946                 rc = lustre_pack_reply(req, buffers, size, NULL);
 947                 if (rc)
 948                         GOTO(out, rc);
 949         }
 950
 951         if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN)
 952                 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
 953         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
 954                 lock->l_req_extent = lock->l_policy_data.l_extent;
 955
 956         err = ldlm_lock_enqueue(ns, &lock, cookie, &flags);
 957         if (err)
 958                 GOTO(out, err);
 959
 960         dlm_rep = lustre_msg_buf(req->rq_repmsg, DLM_LOCKREPLY_OFF,
 961                                  sizeof(*dlm_rep));
 962         dlm_rep->lock_flags = flags;
 963
 964         ldlm_lock2desc(lock, &dlm_rep->lock_desc);
 965         ldlm_lock2handle(lock, &dlm_rep->lock_handle);
 966
 967         /* We never send a blocking AST until the lock is granted, but
 968          * we can tell it right now */
 969         lock_res_and_lock(lock);
 970
 971         /* Now take into account flags to be inherited from original lock
 972            request both in reply to client and in our own lock flags. */
 973         dlm_rep->lock_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
 974         lock->l_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
 975
 976         /* Don't move a pending lock onto the export if it has already
 977          * been evicted.  Cancel it now instead. (bug 5683) */
 978         if (unlikely(req->rq_export->exp_failed ||
 979                      OBD_FAIL_CHECK_ONCE(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
 980                 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
 981                 rc = -ENOTCONN;
 982         } else if (lock->l_flags & LDLM_FL_AST_SENT) {
 983                 dlm_rep->lock_flags |= LDLM_FL_AST_SENT;
 984                 if (lock->l_granted_mode == lock->l_req_mode) {
 985                         /*
 986                          * Only cancel lock if it was granted, because it would
 987                          * be destroyed immediatelly and would never be granted
 988                          * in the future, causing timeouts on client.  Not
 989                          * granted lock will be cancelled immediatelly after
 990                          * sending completion AST.
 991                          */
 992                         if (dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK) {
 993                                 unlock_res_and_lock(lock);
 994                                 ldlm_lock_cancel(lock);
 995                                 lock_res_and_lock(lock);
 996                         } else
 997                                 ldlm_add_waiting_lock(lock);
 998                 }
 999         }
1000         /* Make sure we never ever grant usual metadata locks to liblustre
1001            clients */
1002         if ((dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN ||
1003             dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) &&
1004              req->rq_export->exp_libclient) {
1005                 if (unlikely(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) ||
1006                              !(dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK))){
1007                         CERROR("Granting sync lock to libclient. "
1008                                "req fl %d, rep fl %d, lock fl %d\n",
1009                                dlm_req->lock_flags, dlm_rep->lock_flags,
1010                                lock->l_flags);
1011                         LDLM_ERROR(lock, "sync lock");
1012                         if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT) {
1013                                 struct ldlm_intent *it;
1014                                 it = lustre_msg_buf(req->rq_reqmsg,
1015                                                     DLM_INTENT_IT_OFF,
1016                                                     sizeof(*it));
1017                                 if (it != NULL) {
1018                                         CERROR("This is intent %s ("LPU64")\n",
1019                                                ldlm_it2str(it->opc), it->opc);
1020                                 }
1021                         }
1022                 }
1023         }
1024
1025         unlock_res_and_lock(lock);
1026
1027         EXIT;
1028  out:
1029         req->rq_status = err;
1030         if (req->rq_reply_state == NULL) {
1031                 err = lustre_pack_reply(req, 1, NULL, NULL);
1032                 if (rc == 0)
1033                         rc = err;
1034                 req->rq_status = rc;
1035         }
1036
1037         /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
1038          * ldlm_reprocess_all.  If this moves, revisit that code. -phil */
1039         if (lock) {
1040                 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
1041                            "(err=%d, rc=%d)", err, rc);
1042
1043                 lock_res_and_lock(lock);
1044                 if (rc == 0) {
1045                         size[DLM_REPLY_REC_OFF] = lock->l_resource->lr_lvb_len;
1046                         if (size[DLM_REPLY_REC_OFF] > 0) {
1047                                 void *lvb = lustre_msg_buf(req->rq_repmsg,
1048                                                        DLM_REPLY_REC_OFF,
1049                                                        size[DLM_REPLY_REC_OFF]);
1050                                 LASSERTF(lvb != NULL, "req %p, lock %p\n",
1051                                          req, lock);
1052
1053                                 memcpy(lvb, lock->l_resource->lr_lvb_data,
1054                                        size[DLM_REPLY_REC_OFF]);
1055                         }
1056                 } else {
1057                         ldlm_resource_unlink_lock(lock);
1058                         ldlm_lock_destroy_nolock(lock);
1059                 }
1060                 unlock_res_and_lock(lock);
1061
1062                 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
1063                         ldlm_reprocess_all(lock->l_resource);
1064
1065                 LDLM_LOCK_PUT(lock);
1066         }
1067
1068         LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
1069                           lock, rc);
1070
1071         return rc;
1072 }
1073
1074 int ldlm_handle_enqueue(struct ptlrpc_request *req,
1075                         ldlm_completion_callback completion_callback,
1076                         ldlm_blocking_callback blocking_callback,
1077                         ldlm_glimpse_callback glimpse_callback)
1078 {
1079         int rc;
1080         struct ldlm_request *dlm_req;
1081         struct ldlm_callback_suite cbs = {
1082                 .lcs_completion = completion_callback,
1083                 .lcs_blocking   = blocking_callback,
1084                 .lcs_glimpse    = glimpse_callback
1085         };
1086
1087
1088         dlm_req = lustre_swab_reqbuf(req, DLM_LOCKREQ_OFF,
1089                                      sizeof *dlm_req, lustre_swab_ldlm_request);
1090         if (dlm_req != NULL) {
1091                 rc = ldlm_handle_enqueue0(req->rq_export->exp_obd->obd_namespace,
1092                                           req, dlm_req, &cbs);
1093         } else {
1094                 CERROR ("Can't unpack dlm_req\n");
1095                 rc = -EFAULT;
1096         }
1097         return rc;
1098 }
1099
1100 int ldlm_handle_convert0(struct ptlrpc_request *req,
1101                          const struct ldlm_request *dlm_req)
1102 {
1103         struct ldlm_reply *dlm_rep;
1104         struct ldlm_lock *lock;
1105         int rc;
1106         int size[2] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body),
1107                         [DLM_LOCKREPLY_OFF]   = sizeof(*dlm_rep) };
1108         ENTRY;
1109
1110         if (req->rq_export && req->rq_export->exp_ldlm_stats)
1111                 lprocfs_counter_incr(req->rq_export->exp_ldlm_stats,
1112                                      LDLM_CONVERT - LDLM_FIRST_OPC);
1113
1114         rc = lustre_pack_reply(req, 2, size, NULL);
1115         if (rc) {
1116                 CERROR("out of memory\n");
1117                 RETURN(-ENOMEM);
1118         }
1119         dlm_rep = lustre_msg_buf(req->rq_repmsg, DLM_LOCKREPLY_OFF,
1120                                  sizeof(*dlm_rep));
1121         dlm_rep->lock_flags = dlm_req->lock_flags;
1122
1123         lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
1124         if (!lock) {
1125                 req->rq_status = EINVAL;
1126         } else {
1127                 void *res = NULL;
1128
1129                 LDLM_DEBUG(lock, "server-side convert handler START");
1130
1131                 do_gettimeofday(&lock->l_enqueued_time);
1132                 res = ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
1133                                         &dlm_rep->lock_flags);
1134                 if (res) {
1135                         if (ldlm_del_waiting_lock(lock))
1136                                 LDLM_DEBUG(lock, "converted waiting lock");
1137                         req->rq_status = 0;
1138                 } else {
1139                         req->rq_status = EDEADLOCK;
1140                 }
1141         }
1142
1143         if (lock) {
1144                 if (!req->rq_status)
1145                         ldlm_reprocess_all(lock->l_resource);
1146                 LDLM_DEBUG(lock, "server-side convert handler END");
1147                 LDLM_LOCK_PUT(lock);
1148         } else
1149                 LDLM_DEBUG_NOLOCK("server-side convert handler END");
1150
1151         RETURN(0);
1152 }
1153
1154 int ldlm_handle_convert(struct ptlrpc_request *req)
1155 {
1156         int rc;
1157         struct ldlm_request *dlm_req;
1158
1159         dlm_req = lustre_swab_reqbuf(req, DLM_LOCKREQ_OFF, sizeof *dlm_req,
1160                                      lustre_swab_ldlm_request);
1161         if (dlm_req != NULL) {
1162                 rc = ldlm_handle_convert0(req, dlm_req);
1163         } else {
1164                 CERROR ("Can't unpack dlm_req\n");
1165                 rc = -EFAULT;
1166         }
1167         return rc;
1168 }
1169
1170 /* Cancel all the locks, which handles are packed into ldlm_request */
1171 int ldlm_request_cancel(struct ptlrpc_request *req,
1172                         const struct ldlm_request *dlm_req, int first)
1173 {
1174         struct ldlm_resource *res, *pres = NULL;
1175         struct ldlm_lock *lock;
1176         int i, count, done = 0;
1177         ENTRY;
1178
1179         count = dlm_req->lock_count ? dlm_req->lock_count : 1;
1180         if (first >= count)
1181                 RETURN(0);
1182
1183         /* There is no lock on the server at the replay time,
1184          * skip lock cancelling to make replay tests to pass. */
1185         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1186                 RETURN(0);
1187
1188         LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, "
1189                           "starting at %d", count, first);
1190
1191         for (i = first; i < count; i++) {
1192                 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
1193                 if (!lock) {
1194                         LDLM_DEBUG_NOLOCK("server-side cancel handler stale "
1195                                           "lock (cookie "LPU64")",
1196                                           dlm_req->lock_handle[i].cookie);
1197                         continue;
1198                 }
1199
1200                 res = lock->l_resource;
1201                 done++;
1202
1203                 if (res != pres) {
1204                         if (pres != NULL) {
1205                                 ldlm_reprocess_all(pres);
1206                                 ldlm_resource_putref(pres);
1207                         }
1208                         if (res != NULL) {
1209                                 ldlm_resource_getref(res);
1210                                 ldlm_res_lvbo_update(res, NULL, 0, 1);
1211                         }
1212                         pres = res;
1213                 }
1214                 ldlm_lock_cancel(lock);
1215                 LDLM_LOCK_PUT(lock);
1216         }
1217         if (pres != NULL) {
1218                 ldlm_reprocess_all(pres);
1219                 ldlm_resource_putref(pres);
1220         }
1221         LDLM_DEBUG_NOLOCK("server-side cancel handler END");
1222         RETURN(done);
1223 }
1224
1225 int ldlm_handle_cancel(struct ptlrpc_request *req)
1226 {
1227         struct ldlm_request *dlm_req;
1228         int rc;
1229         ENTRY;
1230
1231         dlm_req = lustre_swab_reqbuf(req, DLM_LOCKREQ_OFF, sizeof(*dlm_req),
1232                                      lustre_swab_ldlm_request);
1233         if (dlm_req == NULL) {
1234                 CERROR("bad request buffer for cancel\n");
1235                 RETURN(-EFAULT);
1236         }
1237
1238         if (req->rq_export && req->rq_export->exp_ldlm_stats)
1239                 lprocfs_counter_incr(req->rq_export->exp_ldlm_stats,
1240                                      LDLM_CANCEL - LDLM_FIRST_OPC);
1241
1242         rc = lustre_pack_reply(req, 1, NULL, NULL);
1243         if (rc) {
1244                 CERROR("out of memory\n");
1245                 RETURN(-ENOMEM);
1246         }
1247
1248         if (!ldlm_request_cancel(req, dlm_req, 0))
1249                 req->rq_status = ESTALE;
1250
1251         if (ptlrpc_reply(req) != 0)
1252                 LBUG();
1253
1254         RETURN(0);
1255 }
1256
1257 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
1258                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1259 {
1260         int do_ast;
1261         ENTRY;
1262
1263         LDLM_DEBUG(lock, "client blocking AST callback handler START");
1264
1265         lock_res_and_lock(lock);
1266         lock->l_flags |= LDLM_FL_CBPENDING;
1267
1268         if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
1269                 lock->l_flags |= LDLM_FL_CANCEL;
1270
1271         do_ast = (!lock->l_readers && !lock->l_writers);
1272         unlock_res_and_lock(lock);
1273
1274         if (do_ast) {
1275                 LDLM_DEBUG(lock, "already unused, calling "
1276                            "callback (%p)", lock->l_blocking_ast);
1277                 if (lock->l_blocking_ast != NULL)
1278                         lock->l_blocking_ast(lock, ld, lock->l_ast_data,
1279                                              LDLM_CB_BLOCKING);
1280         } else {
1281                 LDLM_DEBUG(lock, "Lock still has references, will be"
1282                            " cancelled later");
1283         }
1284
1285         LDLM_DEBUG(lock, "client blocking callback handler END");
1286         LDLM_LOCK_PUT(lock);
1287         EXIT;
1288 }
1289
1290 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
1291                                     struct ldlm_namespace *ns,
1292                                     struct ldlm_request *dlm_req,
1293                                     struct ldlm_lock *lock)
1294 {
1295         CFS_LIST_HEAD(ast_list);
1296         ENTRY;
1297
1298         LDLM_DEBUG(lock, "client completion callback handler START");
1299
1300         lock_res_and_lock(lock);
1301
1302         /* If we receive the completion AST before the actual enqueue returned,
1303          * then we might need to switch lock modes, resources, or extents. */
1304         if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
1305                 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
1306                 LDLM_DEBUG(lock, "completion AST, new lock mode");
1307         }
1308
1309         if (lock->l_resource->lr_type != LDLM_PLAIN) {
1310                 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1311                 LDLM_DEBUG(lock, "completion AST, new policy data");
1312         }
1313
1314         ldlm_resource_unlink_lock(lock);
1315         if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
1316                    &lock->l_resource->lr_name,
1317                    sizeof(lock->l_resource->lr_name)) != 0) {
1318                 unlock_res_and_lock(lock);
1319                 ldlm_lock_change_resource(ns, lock,
1320                                         &dlm_req->lock_desc.l_resource.lr_name);
1321                 LDLM_DEBUG(lock, "completion AST, new resource");
1322                 CERROR("change resource!\n");
1323                 lock_res_and_lock(lock);
1324         }
1325
1326         if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
1327                 lock->l_flags |= LDLM_FL_CBPENDING;
1328                 LDLM_DEBUG(lock, "completion AST includes blocking AST");
1329         }
1330
1331         if (lock->l_lvb_len) {
1332                 void *lvb;
1333                 lvb = lustre_swab_reqbuf(req, DLM_REQ_REC_OFF, lock->l_lvb_len,
1334                                          lock->l_lvb_swabber);
1335                 if (lvb == NULL) {
1336                         LDLM_ERROR(lock, "completion AST did not contain "
1337                                    "expected LVB!");
1338                 } else {
1339                         memcpy(lock->l_lvb_data, lvb, lock->l_lvb_len);
1340                 }
1341         }
1342
1343         ldlm_grant_lock(lock, &ast_list);
1344         unlock_res_and_lock(lock);
1345
1346         LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
1347
1348         ldlm_run_cp_ast_work(&ast_list);
1349
1350         LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
1351                           lock);
1352         LDLM_LOCK_PUT(lock);
1353         EXIT;
1354 }
1355
1356 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
1357                                     struct ldlm_namespace *ns,
1358                                     struct ldlm_request *dlm_req,
1359                                     struct ldlm_lock *lock)
1360 {
1361         int rc = -ENOSYS;
1362         ENTRY;
1363
1364         LDLM_DEBUG(lock, "client glimpse AST callback handler");
1365
1366         if (lock->l_glimpse_ast != NULL)
1367                 rc = lock->l_glimpse_ast(lock, req);
1368
1369         if (req->rq_repmsg != NULL) {
1370                 ptlrpc_reply(req);
1371         } else {
1372                 req->rq_status = rc;
1373                 ptlrpc_error(req);
1374         }
1375
1376         lock_res_and_lock(lock);
1377         if (lock->l_granted_mode == LCK_PW &&
1378             !lock->l_readers && !lock->l_writers &&
1379             cfs_time_after(cfs_time_current(),
1380                            cfs_time_add(lock->l_last_used,
1381                                         cfs_time_seconds(10)))) {
1382                 unlock_res_and_lock(lock);
1383                 if (ldlm_bl_to_thread_lock(ns, NULL, lock))
1384                         ldlm_handle_bl_callback(ns, NULL, lock);
1385
1386                 EXIT;
1387                 return;
1388         }
1389         unlock_res_and_lock(lock);
1390         LDLM_LOCK_PUT(lock);
1391         EXIT;
1392 }
1393
1394 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1395 {
1396         req->rq_status = rc;
1397         if (req->rq_reply_state == NULL) {
1398                 rc = lustre_pack_reply(req, 1, NULL, NULL);
1399                 if (rc)
1400                         return rc;
1401         }
1402         return ptlrpc_reply(req);
1403 }
1404
1405 #ifdef __KERNEL__
1406 static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
1407                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock,
1408                              struct list_head *cancels, int count)
1409 {
1410         struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1411         struct ldlm_bl_work_item *blwi;
1412         ENTRY;
1413
1414         if (cancels && count == 0)
1415                 RETURN(0);
1416
1417         OBD_ALLOC(blwi, sizeof(*blwi));
1418         if (blwi == NULL)
1419                 RETURN(-ENOMEM);
1420
1421         blwi->blwi_ns = ns;
1422         if (ld != NULL)
1423                 blwi->blwi_ld = *ld;
1424         if (count) {
1425                 list_add(&blwi->blwi_head, cancels);
1426                 list_del_init(cancels);
1427                 blwi->blwi_count = count;
1428         } else {
1429                 blwi->blwi_lock = lock;
1430         }
1431         spin_lock(&blp->blp_lock);
1432         list_add_tail(&blwi->blwi_entry, &blp->blp_list);
1433         cfs_waitq_signal(&blp->blp_waitq);
1434         spin_unlock(&blp->blp_lock);
1435
1436         RETURN(0);
1437 }
1438 #endif
1439
1440 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1441                            struct ldlm_lock *lock)
1442 {
1443 #ifdef __KERNEL__
1444         RETURN(ldlm_bl_to_thread(ns, ld, lock, NULL, 0));
1445 #else
1446         RETURN(-ENOSYS);
1447 #endif
1448 }
1449
1450 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1451                            struct list_head *cancels, int count)
1452 {
1453 #ifdef __KERNEL__
1454         RETURN(ldlm_bl_to_thread(ns, ld, NULL, cancels, count));
1455 #else
1456         RETURN(-ENOSYS);
1457 #endif
1458 }
1459
1460 static int ldlm_callback_handler(struct ptlrpc_request *req)
1461 {
1462         struct ldlm_namespace *ns;
1463         struct ldlm_request *dlm_req;
1464         struct ldlm_lock *lock;
1465         int rc;
1466         ENTRY;
1467
1468         /* Requests arrive in sender's byte order.  The ptlrpc service
1469          * handler has already checked and, if necessary, byte-swapped the
1470          * incoming request message body, but I am responsible for the
1471          * message buffers. */
1472
1473         if (req->rq_export == NULL) {
1474                 struct ldlm_request *dlm_req;
1475
1476                 CDEBUG(D_RPCTRACE, "operation %d from %s with bad "
1477                        "export cookie "LPX64"; this is "
1478                        "normal if this node rebooted with a lock held\n",
1479                        lustre_msg_get_opc(req->rq_reqmsg),
1480                        libcfs_id2str(req->rq_peer),
1481                        lustre_msg_get_handle(req->rq_reqmsg)->cookie);
1482
1483                 dlm_req = lustre_swab_reqbuf(req, DLM_LOCKREQ_OFF,
1484                                              sizeof(*dlm_req),
1485                                              lustre_swab_ldlm_request);
1486                 if (dlm_req != NULL)
1487                         CDEBUG(D_RPCTRACE, "--> lock cookie: "LPX64"\n",
1488                                dlm_req->lock_handle[0].cookie);
1489
1490                 ldlm_callback_reply(req, -ENOTCONN);
1491                 RETURN(0);
1492         }
1493
1494         LASSERT(req->rq_export != NULL);
1495         LASSERT(req->rq_export->exp_obd != NULL);
1496
1497         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1498         case LDLM_BL_CALLBACK:
1499                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
1500                 break;
1501         case LDLM_CP_CALLBACK:
1502                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CP_CALLBACK, 0);
1503                 break;
1504         case LDLM_GL_CALLBACK:
1505                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_GL_CALLBACK, 0);
1506                 break;
1507         case OBD_LOG_CANCEL: /* remove this eventually - for 1.4.0 compat */
1508                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOG_CANCEL_NET, 0);
1509                 rc = llog_origin_handle_cancel(req);
1510                 ldlm_callback_reply(req, rc);
1511                 RETURN(0);
1512         case OBD_QC_CALLBACK:
1513                 OBD_FAIL_RETURN(OBD_FAIL_OBD_QC_CALLBACK_NET, 0);
1514                 rc = target_handle_qc_callback(req);
1515                 ldlm_callback_reply(req, rc);
1516                 RETURN(0);
1517         case QUOTA_DQACQ:
1518         case QUOTA_DQREL:
1519                 /* reply in handler */
1520                 rc = target_handle_dqacq_callback(req);
1521                 RETURN(0);
1522         case LLOG_ORIGIN_HANDLE_CREATE:
1523                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1524                 rc = llog_origin_handle_create(req);
1525                 ldlm_callback_reply(req, rc);
1526                 RETURN(0);
1527         case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
1528                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1529                 rc = llog_origin_handle_next_block(req);
1530                 ldlm_callback_reply(req, rc);
1531                 RETURN(0);
1532         case LLOG_ORIGIN_HANDLE_READ_HEADER:
1533                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1534                 rc = llog_origin_handle_read_header(req);
1535                 ldlm_callback_reply(req, rc);
1536                 RETURN(0);
1537         case LLOG_ORIGIN_HANDLE_CLOSE:
1538                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1539                 rc = llog_origin_handle_close(req);
1540                 ldlm_callback_reply(req, rc);
1541                 RETURN(0);
1542         case SEC_CTX_FINI:
1543                 /* do nothing */
1544                 RETURN(0);
1545         default:
1546                 CERROR("unknown opcode %u\n",
1547                        lustre_msg_get_opc(req->rq_reqmsg));
1548                 ldlm_callback_reply(req, -EPROTO);
1549                 RETURN(0);
1550         }
1551
1552         ns = req->rq_export->exp_obd->obd_namespace;
1553         LASSERT(ns != NULL);
1554
1555         dlm_req = lustre_swab_reqbuf(req, DLM_LOCKREQ_OFF, sizeof(*dlm_req),
1556                                      lustre_swab_ldlm_request);
1557         if (dlm_req == NULL) {
1558                 CERROR ("can't unpack dlm_req\n");
1559                 ldlm_callback_reply(req, -EPROTO);
1560                 RETURN (0);
1561         }
1562
1563         lock = ldlm_handle2lock_ns(ns, &dlm_req->lock_handle[0]);
1564         if (!lock) {
1565                 CDEBUG(D_DLMTRACE, "callback on lock "LPX64" - lock "
1566                        "disappeared\n", dlm_req->lock_handle[0].cookie);
1567                 ldlm_callback_reply(req, -EINVAL);
1568                 RETURN(0);
1569         }
1570
1571         /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
1572         lock_res_and_lock(lock);
1573         lock->l_flags |= (dlm_req->lock_flags & LDLM_AST_FLAGS);
1574         if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1575                 /* If somebody cancels locks and cache is already droped,
1576                  * we can tell the server we have no lock. Otherwise, we
1577                  * should send cancel after dropping the cache. */
1578                 if ((lock->l_flags & LDLM_FL_CANCELING) &&
1579                     (lock->l_flags & LDLM_FL_BL_DONE)) {
1580                         LDLM_DEBUG(lock, "callback on lock "
1581                                    LPX64" - lock disappeared\n",
1582                                    dlm_req->lock_handle[0].cookie);
1583                         unlock_res_and_lock(lock);
1584                         LDLM_LOCK_PUT(lock);
1585                         ldlm_callback_reply(req, -EINVAL);
1586                         RETURN(0);
1587                 }
1588                 lock->l_flags |= LDLM_FL_BL_AST;
1589         }
1590         unlock_res_and_lock(lock);
1591
1592         /* We want the ost thread to get this reply so that it can respond
1593          * to ost requests (write cache writeback) that might be triggered
1594          * in the callback.
1595          *
1596          * But we'd also like to be able to indicate in the reply that we're
1597          * cancelling right now, because it's unused, or have an intent result
1598          * in the reply, so we might have to push the responsibility for sending
1599          * the reply down into the AST handlers, alas. */
1600
1601         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1602         case LDLM_BL_CALLBACK:
1603                 CDEBUG(D_INODE, "blocking ast\n");
1604                 if (!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK))
1605                         ldlm_callback_reply(req, 0);
1606                 if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
1607                         ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
1608                 break;
1609         case LDLM_CP_CALLBACK:
1610                 CDEBUG(D_INODE, "completion ast\n");
1611                 ldlm_callback_reply(req, 0);
1612                 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
1613                 break;
1614         case LDLM_GL_CALLBACK:
1615                 CDEBUG(D_INODE, "glimpse ast\n");
1616                 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
1617                 break;
1618         default:
1619                 LBUG();                         /* checked above */
1620         }
1621
1622         RETURN(0);
1623 }
1624
1625 static int ldlm_cancel_handler(struct ptlrpc_request *req)
1626 {
1627         int rc;
1628         ENTRY;
1629
1630         /* Requests arrive in sender's byte order.  The ptlrpc service
1631          * handler has already checked and, if necessary, byte-swapped the
1632          * incoming request message body, but I am responsible for the
1633          * message buffers. */
1634
1635         if (req->rq_export == NULL) {
1636                 struct ldlm_request *dlm_req;
1637
1638                 CERROR("operation %d from %s with bad export cookie "LPU64"\n",
1639                        lustre_msg_get_opc(req->rq_reqmsg),
1640                        libcfs_id2str(req->rq_peer),
1641                        lustre_msg_get_handle(req->rq_reqmsg)->cookie);
1642
1643                 dlm_req = lustre_swab_reqbuf(req, DLM_LOCKREQ_OFF,
1644                                              sizeof(*dlm_req),
1645                                              lustre_swab_ldlm_request);
1646                 if (dlm_req != NULL)
1647                         ldlm_lock_dump_handle(D_ERROR,
1648                                               &dlm_req->lock_handle[0]);
1649                 ldlm_callback_reply(req, -ENOTCONN);
1650                 RETURN(0);
1651         }
1652
1653         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1654
1655         /* XXX FIXME move this back to mds/handler.c, bug 249 */
1656         case LDLM_CANCEL:
1657                 CDEBUG(D_INODE, "cancel\n");
1658                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0);
1659                 rc = ldlm_handle_cancel(req);
1660                 if (rc)
1661                         break;
1662                 RETURN(0);
1663         case OBD_LOG_CANCEL:
1664                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOG_CANCEL_NET, 0);
1665                 rc = llog_origin_handle_cancel(req);
1666                 ldlm_callback_reply(req, rc);
1667                 RETURN(0);
1668         default:
1669                 CERROR("invalid opcode %d\n",
1670                        lustre_msg_get_opc(req->rq_reqmsg));
1671                 ldlm_callback_reply(req, -EINVAL);
1672         }
1673
1674         RETURN(0);
1675 }
1676
1677 void ldlm_revoke_export_locks(struct obd_export *exp)
1678 {
1679         struct list_head *locklist = &exp->exp_ldlm_data.led_held_locks;
1680         struct list_head  rpc_list;
1681         struct ldlm_lock *lock, *next;
1682         struct ldlm_lock_desc desc;
1683
1684         ENTRY;
1685         INIT_LIST_HEAD(&rpc_list);
1686
1687         spin_lock(&exp->exp_ldlm_data.led_lock);
1688         list_for_each_entry_safe(lock, next, locklist, l_export_chain) {
1689                 lock_res_and_lock(lock);
1690
1691                 if (lock->l_req_mode != lock->l_granted_mode) {
1692                         unlock_res_and_lock(lock);
1693                         continue;
1694                 }
1695
1696                 LASSERT(lock->l_resource);
1697                 if (lock->l_resource->lr_type != LDLM_IBITS &&
1698                     lock->l_resource->lr_type != LDLM_PLAIN) {
1699                         unlock_res_and_lock(lock);
1700                         continue;
1701                 }
1702
1703                 if (lock->l_flags & LDLM_FL_AST_SENT) {
1704                         unlock_res_and_lock(lock);
1705                         continue;
1706                 }
1707
1708                 LASSERT(lock->l_blocking_ast);
1709                 LASSERT(!lock->l_blocking_lock);
1710
1711                 lock->l_flags |= LDLM_FL_AST_SENT;
1712                 list_move(&lock->l_export_chain, &rpc_list);
1713
1714                 unlock_res_and_lock(lock);
1715         }
1716         spin_unlock(&exp->exp_ldlm_data.led_lock);
1717
1718         while (!list_empty(&rpc_list)) {
1719                 lock = list_entry(rpc_list.next, struct ldlm_lock,
1720                                   l_export_chain);
1721                 list_del_init(&lock->l_export_chain);
1722
1723                 /* the desc just pretend to exclusive */
1724                 ldlm_lock2desc(lock, &desc);
1725                 desc.l_req_mode = LCK_EX;
1726                 desc.l_granted_mode = 0;
1727
1728                 LDLM_LOCK_GET(lock);
1729                 lock->l_blocking_ast(lock, &desc, lock->l_ast_data,
1730                                      LDLM_CB_BLOCKING);
1731                 LDLM_LOCK_PUT(lock);
1732         }
1733         EXIT;
1734 }
1735
1736 #ifdef __KERNEL__
1737 static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp)
1738 {
1739         struct ldlm_bl_work_item *blwi = NULL;
1740
1741         spin_lock(&blp->blp_lock);
1742         if (!list_empty(&blp->blp_list)) {
1743                 blwi = list_entry(blp->blp_list.next, struct ldlm_bl_work_item,
1744                                   blwi_entry);
1745                 list_del(&blwi->blwi_entry);
1746         }
1747         spin_unlock(&blp->blp_lock);
1748
1749         return blwi;
1750 }
1751
1752 struct ldlm_bl_thread_data {
1753         int                     bltd_num;
1754         struct ldlm_bl_pool     *bltd_blp;
1755 };
1756
1757 static int ldlm_bl_thread_main(void *arg)
1758 {
1759         struct ldlm_bl_thread_data *bltd = arg;
1760         struct ldlm_bl_pool *blp = bltd->bltd_blp;
1761         ENTRY;
1762
1763         {
1764                 char name[CFS_CURPROC_COMM_MAX];
1765                 snprintf(name, sizeof(name) - 1, "ldlm_bl_%02d",
1766                          bltd->bltd_num);
1767                 cfs_daemonize(name);
1768         }
1769
1770         atomic_inc(&blp->blp_num_threads);
1771         complete(&blp->blp_comp);
1772
1773         while(1) {
1774                 struct l_wait_info lwi = { 0 };
1775                 struct ldlm_bl_work_item *blwi = NULL;
1776
1777                 l_wait_event_exclusive(blp->blp_waitq,
1778                                        (blwi = ldlm_bl_get_work(blp)) != NULL,
1779                                        &lwi);
1780
1781                 if (blwi->blwi_ns == NULL)
1782                         break;
1783
1784                 if (blwi->blwi_count) {
1785                         /* The special case when we cancel locks in lru
1786                          * asynchronously, we pass the list of locks here.
1787                          * Thus lock is marked LDLM_FL_CANCELING, and already
1788                          * canceled locally. */
1789                         ldlm_cli_cancel_list(&blwi->blwi_head,
1790                                              blwi->blwi_count, NULL, 0, 0);
1791                 } else {
1792                         ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
1793                                                 blwi->blwi_lock);
1794                 }
1795                 OBD_FREE(blwi, sizeof(*blwi));
1796         }
1797
1798         atomic_dec(&blp->blp_num_threads);
1799         complete(&blp->blp_comp);
1800         RETURN(0);
1801 }
1802
1803 #endif
1804
1805 static int ldlm_setup(void);
1806 static int ldlm_cleanup(int force);
1807
1808 int ldlm_get_ref(void)
1809 {
1810         int rc = 0;
1811         ENTRY;
1812         mutex_down(&ldlm_ref_sem);
1813         if (++ldlm_refcount == 1) {
1814                 rc = ldlm_setup();
1815                 if (rc)
1816                         ldlm_refcount--;
1817         }
1818         mutex_up(&ldlm_ref_sem);
1819
1820         RETURN(rc);
1821 }
1822
1823 void ldlm_put_ref(int force)
1824 {
1825         ENTRY;
1826         mutex_down(&ldlm_ref_sem);
1827         if (ldlm_refcount == 1) {
1828                 int rc = ldlm_cleanup(force);
1829                 if (rc)
1830                         CERROR("ldlm_cleanup failed: %d\n", rc);
1831                 else
1832                         ldlm_refcount--;
1833         } else {
1834                 ldlm_refcount--;
1835         }
1836         mutex_up(&ldlm_ref_sem);
1837
1838         EXIT;
1839 }
1840
1841 static int ldlm_setup(void)
1842 {
1843         struct ldlm_bl_pool *blp;
1844         int rc = 0;
1845 #ifdef __KERNEL__
1846         int i;
1847 #endif
1848         ENTRY;
1849
1850         if (ldlm_state != NULL)
1851                 RETURN(-EALREADY);
1852
1853         OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
1854         if (ldlm_state == NULL)
1855                 RETURN(-ENOMEM);
1856
1857 #ifdef LPROCFS
1858         rc = ldlm_proc_setup();
1859         if (rc != 0)
1860                 GOTO(out_free, rc);
1861 #endif
1862
1863         ldlm_state->ldlm_cb_service =
1864                 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
1865                                 LDLM_MAXREPSIZE, LDLM_CB_REQUEST_PORTAL,
1866                                 LDLM_CB_REPLY_PORTAL, ldlm_timeout * 900,
1867                                 ldlm_callback_handler, "ldlm_cbd",
1868                                 ldlm_svc_proc_dir, NULL,
1869                                 LDLM_THREADS_AUTO_MIN, LDLM_THREADS_AUTO_MAX,
1870                                 "ldlm_cb",
1871                                 LCT_MD_THREAD|LCT_DT_THREAD);
1872
1873         if (!ldlm_state->ldlm_cb_service) {
1874                 CERROR("failed to start service\n");
1875                 GOTO(out_proc, rc = -ENOMEM);
1876         }
1877
1878         ldlm_state->ldlm_cancel_service =
1879                 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
1880                                 LDLM_MAXREPSIZE, LDLM_CANCEL_REQUEST_PORTAL,
1881                                 LDLM_CANCEL_REPLY_PORTAL, ldlm_timeout * 6000,
1882                                 ldlm_cancel_handler, "ldlm_canceld",
1883                                 ldlm_svc_proc_dir, NULL,
1884                                 LDLM_THREADS_AUTO_MIN, LDLM_THREADS_AUTO_MAX,
1885                                 "ldlm_cn",
1886                                 LCT_MD_THREAD|LCT_DT_THREAD|LCT_CL_THREAD);
1887
1888         if (!ldlm_state->ldlm_cancel_service) {
1889                 CERROR("failed to start service\n");
1890                 GOTO(out_proc, rc = -ENOMEM);
1891         }
1892
1893         OBD_ALLOC(blp, sizeof(*blp));
1894         if (blp == NULL)
1895                 GOTO(out_proc, rc = -ENOMEM);
1896         ldlm_state->ldlm_bl_pool = blp;
1897
1898         atomic_set(&blp->blp_num_threads, 0);
1899         cfs_waitq_init(&blp->blp_waitq);
1900         spin_lock_init(&blp->blp_lock);
1901
1902         CFS_INIT_LIST_HEAD(&blp->blp_list);
1903
1904 #ifdef __KERNEL__
1905         for (i = 0; i < LDLM_BL_THREADS; i++) {
1906                 struct ldlm_bl_thread_data bltd = {
1907                         .bltd_num = i,
1908                         .bltd_blp = blp,
1909                 };
1910                 init_completion(&blp->blp_comp);
1911                 rc = cfs_kernel_thread(ldlm_bl_thread_main, &bltd, 0);
1912                 if (rc < 0) {
1913                         CERROR("cannot start LDLM thread #%d: rc %d\n", i, rc);
1914                         GOTO(out_thread, rc);
1915                 }
1916                 wait_for_completion(&blp->blp_comp);
1917         }
1918
1919         rc = ptlrpc_start_threads(NULL, ldlm_state->ldlm_cancel_service);
1920         if (rc)
1921                 GOTO(out_thread, rc);
1922
1923         rc = ptlrpc_start_threads(NULL, ldlm_state->ldlm_cb_service);
1924         if (rc)
1925                 GOTO(out_thread, rc);
1926
1927         CFS_INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
1928         expired_lock_thread.elt_state = ELT_STOPPED;
1929         cfs_waitq_init(&expired_lock_thread.elt_waitq);
1930
1931         CFS_INIT_LIST_HEAD(&waiting_locks_list);
1932         spin_lock_init(&waiting_locks_spinlock);
1933         cfs_timer_init(&waiting_locks_timer, waiting_locks_callback, 0);
1934
1935         rc = cfs_kernel_thread(expired_lock_main, NULL, CLONE_VM | CLONE_FILES);
1936         if (rc < 0) {
1937                 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
1938                 GOTO(out_thread, rc);
1939         }
1940
1941         wait_event(expired_lock_thread.elt_waitq,
1942                    expired_lock_thread.elt_state == ELT_READY);
1943 #endif
1944
1945 #ifdef __KERNEL__
1946         rc = ldlm_pools_init();
1947         if (rc)
1948                 GOTO(out_thread, rc);
1949 #endif
1950         RETURN(0);
1951
1952 #ifdef __KERNEL__
1953  out_thread:
1954         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
1955         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
1956 #endif
1957
1958  out_proc:
1959 #ifdef LPROCFS
1960         ldlm_proc_cleanup();
1961  out_free:
1962 #endif
1963         OBD_FREE(ldlm_state, sizeof(*ldlm_state));
1964         ldlm_state = NULL;
1965         return rc;
1966 }
1967
1968 static int ldlm_cleanup(int force)
1969 {
1970 #ifdef __KERNEL__
1971         struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1972 #endif
1973         ENTRY;
1974
1975         if (!list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) ||
1976             !list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) {
1977                 CERROR("ldlm still has namespaces; clean these up first.\n");
1978                 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
1979                 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
1980                 RETURN(-EBUSY);
1981         }
1982
1983 #ifdef __KERNEL__
1984         ldlm_pools_fini();
1985 #endif
1986
1987 #ifdef __KERNEL__
1988         while (atomic_read(&blp->blp_num_threads) > 0) {
1989                 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
1990
1991                 init_completion(&blp->blp_comp);
1992
1993                 spin_lock(&blp->blp_lock);
1994                 list_add_tail(&blwi.blwi_entry, &blp->blp_list);
1995                 cfs_waitq_signal(&blp->blp_waitq);
1996                 spin_unlock(&blp->blp_lock);
1997
1998                 wait_for_completion(&blp->blp_comp);
1999         }
2000         OBD_FREE(blp, sizeof(*blp));
2001
2002         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2003         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2004         ldlm_proc_cleanup();
2005
2006         expired_lock_thread.elt_state = ELT_TERMINATE;
2007         cfs_waitq_signal(&expired_lock_thread.elt_waitq);
2008         wait_event(expired_lock_thread.elt_waitq,
2009                    expired_lock_thread.elt_state == ELT_STOPPED);
2010 #else
2011         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2012         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2013 #endif
2014
2015         OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2016         ldlm_state = NULL;
2017
2018         RETURN(0);
2019 }
2020
2021 int __init ldlm_init(void)
2022 {
2023         init_mutex(&ldlm_ref_sem);
2024         init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER));
2025         init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
2026         ldlm_resource_slab = cfs_mem_cache_create("ldlm_resources",
2027                                                sizeof(struct ldlm_resource), 0,
2028                                                SLAB_HWCACHE_ALIGN);
2029         if (ldlm_resource_slab == NULL)
2030                 return -ENOMEM;
2031
2032         ldlm_lock_slab = cfs_mem_cache_create("ldlm_locks",
2033                                            sizeof(struct ldlm_lock), 0,
2034                                            SLAB_HWCACHE_ALIGN);
2035         if (ldlm_lock_slab == NULL) {
2036                 cfs_mem_cache_destroy(ldlm_resource_slab);
2037                 return -ENOMEM;
2038         }
2039
2040         return 0;
2041 }
2042
2043 void __exit ldlm_exit(void)
2044 {
2045         int rc;
2046         if (ldlm_refcount)
2047                 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
2048         rc = cfs_mem_cache_destroy(ldlm_resource_slab);
2049         LASSERTF(rc == 0, "couldn't free ldlm resource slab\n");
2050         rc = cfs_mem_cache_destroy(ldlm_lock_slab);
2051         LASSERTF(rc == 0, "couldn't free ldlm lock slab\n");
2052 }
2053
2054 /* ldlm_extent.c */
2055 EXPORT_SYMBOL(ldlm_extent_shift_kms);
2056
2057 /* ldlm_lock.c */
2058 EXPORT_SYMBOL(ldlm_get_processing_policy);
2059 EXPORT_SYMBOL(ldlm_lock2desc);
2060 EXPORT_SYMBOL(ldlm_register_intent);
2061 EXPORT_SYMBOL(ldlm_lockname);
2062 EXPORT_SYMBOL(ldlm_typename);
2063 EXPORT_SYMBOL(ldlm_lock2handle);
2064 EXPORT_SYMBOL(__ldlm_handle2lock);
2065 EXPORT_SYMBOL(ldlm_lock_get);
2066 EXPORT_SYMBOL(ldlm_lock_put);
2067 EXPORT_SYMBOL(ldlm_lock_match);
2068 EXPORT_SYMBOL(ldlm_lock_cancel);
2069 EXPORT_SYMBOL(ldlm_lock_addref);
2070 EXPORT_SYMBOL(ldlm_lock_decref);
2071 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
2072 EXPORT_SYMBOL(ldlm_lock_change_resource);
2073 EXPORT_SYMBOL(ldlm_lock_set_data);
2074 EXPORT_SYMBOL(ldlm_it2str);
2075 EXPORT_SYMBOL(ldlm_lock_dump);
2076 EXPORT_SYMBOL(ldlm_lock_dump_handle);
2077 EXPORT_SYMBOL(ldlm_cancel_locks_for_export);
2078 EXPORT_SYMBOL(ldlm_reprocess_all_ns);
2079 EXPORT_SYMBOL(ldlm_lock_allow_match);
2080
2081 /* ldlm_request.c */
2082 EXPORT_SYMBOL(ldlm_completion_ast);
2083 EXPORT_SYMBOL(ldlm_blocking_ast);
2084 EXPORT_SYMBOL(ldlm_glimpse_ast);
2085 EXPORT_SYMBOL(ldlm_expired_completion_wait);
2086 EXPORT_SYMBOL(ldlm_prep_enqueue_req);
2087 EXPORT_SYMBOL(ldlm_cli_convert);
2088 EXPORT_SYMBOL(ldlm_cli_enqueue);
2089 EXPORT_SYMBOL(ldlm_cli_enqueue_fini);
2090 EXPORT_SYMBOL(ldlm_cli_enqueue_local);
2091 EXPORT_SYMBOL(ldlm_cli_cancel);
2092 EXPORT_SYMBOL(ldlm_cli_cancel_unused);
2093 EXPORT_SYMBOL(ldlm_cli_cancel_unused_resource);
2094 EXPORT_SYMBOL(ldlm_cli_cancel_req);
2095 EXPORT_SYMBOL(ldlm_cli_join_lru);
2096 EXPORT_SYMBOL(ldlm_replay_locks);
2097 EXPORT_SYMBOL(ldlm_resource_foreach);
2098 EXPORT_SYMBOL(ldlm_namespace_foreach);
2099 EXPORT_SYMBOL(ldlm_namespace_foreach_res);
2100 EXPORT_SYMBOL(ldlm_resource_iterate);
2101 EXPORT_SYMBOL(ldlm_cancel_resource_local);
2102 EXPORT_SYMBOL(ldlm_cli_cancel_list);
2103
2104 /* ldlm_lockd.c */
2105 EXPORT_SYMBOL(ldlm_server_blocking_ast);
2106 EXPORT_SYMBOL(ldlm_server_completion_ast);
2107 EXPORT_SYMBOL(ldlm_server_glimpse_ast);
2108 EXPORT_SYMBOL(ldlm_handle_enqueue);
2109 EXPORT_SYMBOL(ldlm_handle_enqueue0);
2110 EXPORT_SYMBOL(ldlm_handle_cancel);
2111 EXPORT_SYMBOL(ldlm_request_cancel);
2112 EXPORT_SYMBOL(ldlm_handle_convert);
2113 EXPORT_SYMBOL(ldlm_handle_convert0);
2114 EXPORT_SYMBOL(ldlm_del_waiting_lock);
2115 EXPORT_SYMBOL(ldlm_get_ref);
2116 EXPORT_SYMBOL(ldlm_put_ref);
2117 EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
2118 EXPORT_SYMBOL(ldlm_revoke_export_locks);
2119
2120 /* ldlm_resource.c */
2121 EXPORT_SYMBOL(ldlm_namespace_new);
2122 EXPORT_SYMBOL(ldlm_namespace_cleanup);
2123 EXPORT_SYMBOL(ldlm_namespace_free);
2124 EXPORT_SYMBOL(ldlm_namespace_dump);
2125 EXPORT_SYMBOL(ldlm_dump_all_namespaces);
2126 EXPORT_SYMBOL(ldlm_resource_get);
2127 EXPORT_SYMBOL(ldlm_resource_putref);
2128 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
2129
2130 /* ldlm_lib.c */
2131 EXPORT_SYMBOL(client_import_add_conn);
2132 EXPORT_SYMBOL(client_import_del_conn);
2133 EXPORT_SYMBOL(client_obd_setup);
2134 EXPORT_SYMBOL(client_obd_cleanup);
2135 EXPORT_SYMBOL(client_connect_import);
2136 EXPORT_SYMBOL(client_disconnect_export);
2137 EXPORT_SYMBOL(target_start_recovery_thread);
2138 EXPORT_SYMBOL(target_stop_recovery_thread);
2139 EXPORT_SYMBOL(target_handle_connect);
2140 EXPORT_SYMBOL(target_cleanup_recovery);
2141 EXPORT_SYMBOL(target_destroy_export);
2142 EXPORT_SYMBOL(target_cancel_recovery_timer);
2143 EXPORT_SYMBOL(target_send_reply);
2144 EXPORT_SYMBOL(target_queue_recovery_request);
2145 EXPORT_SYMBOL(target_handle_ping);
2146 EXPORT_SYMBOL(target_pack_pool_reply);
2147 EXPORT_SYMBOL(target_handle_disconnect);
2148
2149 /* l_lock.c */
2150 EXPORT_SYMBOL(lock_res_and_lock);
2151 EXPORT_SYMBOL(unlock_res_and_lock);
2152