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[fs/lustre-release.git] / 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(const struct lu_env *env,
547                              struct ptlrpc_request *req, void *data, int rc)
548 {
549         struct ldlm_cb_set_arg *arg;
550         struct ldlm_lock *lock;
551         ENTRY;
552
553         LASSERT(data != NULL);
554
555         arg = req->rq_async_args.pointer_arg[0];
556         lock = req->rq_async_args.pointer_arg[1];
557         LASSERT(lock != NULL);
558         if (rc != 0) {
559                 /* If client canceled the lock but the cancel has not
560                  * been recieved yet, we need to update lvbo to have the
561                  * proper attributes cached. */
562                 if (rc == -EINVAL && arg->type == LDLM_BL_CALLBACK)
563                         ldlm_res_lvbo_update(lock->l_resource, NULL,
564                                              0, 1);
565                 rc = ldlm_handle_ast_error(lock, req, rc,
566                                            arg->type == LDLM_BL_CALLBACK
567                                            ? "blocking" : "completion");
568         }
569
570         LDLM_LOCK_RELEASE(lock);
571
572         if (rc == -ERESTART)
573                 atomic_set(&arg->restart, 1);
574
575         RETURN(0);
576 }
577
578 static inline int ldlm_bl_and_cp_ast_fini(struct ptlrpc_request *req,
579                                           struct ldlm_cb_set_arg *arg,
580                                           struct ldlm_lock *lock,
581                                           int instant_cancel)
582 {
583         int rc = 0;
584         ENTRY;
585
586         if (unlikely(instant_cancel)) {
587                 rc = ptl_send_rpc(req, 1);
588                 ptlrpc_req_finished(req);
589                 if (rc == 0)
590                         /* If we cancelled the lock, we need to restart
591                          * ldlm_reprocess_queue */
592                         atomic_set(&arg->restart, 1);
593         } else {
594                 LDLM_LOCK_GET(lock);
595                 ptlrpc_set_add_req(arg->set, req);
596         }
597
598         RETURN(rc);
599 }
600
601 /*
602  * ->l_blocking_ast() method for server-side locks. This is invoked when newly
603  * enqueued server lock conflicts with given one.
604  *
605  * Sends blocking ast rpc to the client owning that lock; arms timeout timer
606  * to wait for client response.
607  */
608 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
609                              struct ldlm_lock_desc *desc,
610                              void *data, int flag)
611 {
612         struct ldlm_cb_set_arg *arg = data;
613         struct ldlm_request    *body;
614         struct ptlrpc_request  *req;
615         int                     instant_cancel = 0;
616         int                     rc = 0;
617         ENTRY;
618
619         if (flag == LDLM_CB_CANCELING)
620                 /* Don't need to do anything here. */
621                 RETURN(0);
622
623         LASSERT(lock);
624         LASSERT(data != NULL);
625         if (lock->l_export->exp_obd->obd_recovering != 0) {
626                 LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
627                 ldlm_lock_dump(D_ERROR, lock, 0);
628         }
629
630         req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
631                                         &RQF_LDLM_BL_CALLBACK,
632                                         LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK);
633         if (req == NULL)
634                 RETURN(-ENOMEM);
635
636         req->rq_async_args.pointer_arg[0] = arg;
637         req->rq_async_args.pointer_arg[1] = lock;
638         req->rq_interpret_reply = ldlm_cb_interpret;
639         req->rq_no_resend = 1;
640
641         lock_res(lock->l_resource);
642         if (lock->l_granted_mode != lock->l_req_mode) {
643                 /* this blocking AST will be communicated as part of the
644                  * completion AST instead */
645                 unlock_res(lock->l_resource);
646                 ptlrpc_req_finished(req);
647                 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
648                 RETURN(0);
649         }
650
651         if (lock->l_destroyed) {
652                 /* What's the point? */
653                 unlock_res(lock->l_resource);
654                 ptlrpc_req_finished(req);
655                 RETURN(0);
656         }
657
658         if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
659                 instant_cancel = 1;
660
661         body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
662         body->lock_handle[0] = lock->l_remote_handle;
663         body->lock_desc = *desc;
664         body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
665
666         LDLM_DEBUG(lock, "server preparing blocking AST");
667
668         ptlrpc_request_set_replen(req);
669         if (instant_cancel) {
670                 unlock_res(lock->l_resource);
671                 ldlm_lock_cancel(lock);
672         } else {
673                 LASSERT(lock->l_granted_mode == lock->l_req_mode);
674                 ldlm_add_waiting_lock(lock);
675                 unlock_res(lock->l_resource);
676         }
677
678         req->rq_send_state = LUSTRE_IMP_FULL;
679         /* ptlrpc_prep_req already set timeout */
680         if (AT_OFF)
681                 req->rq_timeout = ldlm_get_rq_timeout();
682
683         if (lock->l_export && lock->l_export->exp_nid_stats &&
684             lock->l_export->exp_nid_stats->nid_ldlm_stats)
685                 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
686                                      LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
687
688         rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
689
690         RETURN(rc);
691 }
692
693 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data)
694 {
695         struct ldlm_cb_set_arg *arg = data;
696         struct ldlm_request    *body;
697         struct ptlrpc_request  *req;
698         struct timeval          granted_time;
699         long                    total_enqueue_wait;
700         int                     instant_cancel = 0;
701         int                     rc = 0;
702         ENTRY;
703
704         LASSERT(lock != NULL);
705         LASSERT(data != NULL);
706
707         do_gettimeofday(&granted_time);
708         total_enqueue_wait = cfs_timeval_sub(&granted_time,
709                                              &lock->l_enqueued_time, NULL);
710
711         if (total_enqueue_wait / ONE_MILLION > obd_timeout)
712                 /* non-fatal with AT - change to LDLM_DEBUG? */
713                 LDLM_ERROR(lock, "enqueue wait took %luus from "CFS_TIME_T,
714                            total_enqueue_wait, lock->l_enqueued_time.tv_sec);
715
716         req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse,
717                                     &RQF_LDLM_CP_CALLBACK);
718         if (req == NULL)
719                 RETURN(-ENOMEM);
720
721         lock_res_and_lock(lock);
722         if (lock->l_resource->lr_lvb_len)
723                  req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT,
724                                       lock->l_resource->lr_lvb_len);
725         unlock_res_and_lock(lock);
726
727         rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK);
728         if (rc) {
729                 ptlrpc_request_free(req);
730                 RETURN(rc);
731         }
732
733         req->rq_async_args.pointer_arg[0] = arg;
734         req->rq_async_args.pointer_arg[1] = lock;
735         req->rq_interpret_reply = ldlm_cb_interpret;
736         req->rq_no_resend = 1;
737         body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
738
739         body->lock_handle[0] = lock->l_remote_handle;
740         body->lock_flags = flags;
741         ldlm_lock2desc(lock, &body->lock_desc);
742         if (lock->l_resource->lr_lvb_len) {
743                 void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB);
744
745                 lock_res_and_lock(lock);
746                 memcpy(lvb, lock->l_resource->lr_lvb_data,
747                        lock->l_resource->lr_lvb_len);
748                 unlock_res_and_lock(lock);
749         }
750
751         LDLM_DEBUG(lock, "server preparing completion AST (after %ldus wait)",
752                    total_enqueue_wait);
753
754         /* Server-side enqueue wait time estimate, used in
755             __ldlm_add_waiting_lock to set future enqueue timers */
756         at_add(&lock->l_resource->lr_namespace->ns_at_estimate,
757                total_enqueue_wait / ONE_MILLION);
758
759         ptlrpc_request_set_replen(req);
760
761         req->rq_send_state = LUSTRE_IMP_FULL;
762         /* ptlrpc_prep_req already set timeout */
763         if (AT_OFF)
764                 req->rq_timeout = ldlm_get_rq_timeout();
765
766         /* We only send real blocking ASTs after the lock is granted */
767         lock_res_and_lock(lock);
768         if (lock->l_flags & LDLM_FL_AST_SENT) {
769                 body->lock_flags |= LDLM_FL_AST_SENT;
770
771                 /* We might get here prior to ldlm_handle_enqueue setting
772                  * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
773                  * into waiting list, but this is safe and similar code in
774                  * ldlm_handle_enqueue will call ldlm_lock_cancel() still,
775                  * that would not only cancel the lock, but will also remove
776                  * it from waiting list */
777                 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
778                         unlock_res_and_lock(lock);
779                         ldlm_lock_cancel(lock);
780                         instant_cancel = 1;
781                         lock_res_and_lock(lock);
782                 } else {
783                         /* start the lock-timeout clock */
784                         ldlm_add_waiting_lock(lock);
785                 }
786         }
787         unlock_res_and_lock(lock);
788
789         if (lock->l_export && lock->l_export->exp_nid_stats &&
790             lock->l_export->exp_nid_stats->nid_ldlm_stats)
791                 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
792                                      LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
793
794         rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
795
796         RETURN(rc);
797 }
798
799 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
800 {
801         struct ldlm_resource  *res = lock->l_resource;
802         struct ldlm_request   *body;
803         struct ptlrpc_request *req;
804         int                    rc;
805         ENTRY;
806
807         LASSERT(lock != NULL);
808
809         req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
810                                         &RQF_LDLM_GL_CALLBACK,
811                                         LUSTRE_DLM_VERSION, LDLM_GL_CALLBACK);
812
813         if (req == NULL)
814                 RETURN(-ENOMEM);
815
816         body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
817         body->lock_handle[0] = lock->l_remote_handle;
818         ldlm_lock2desc(lock, &body->lock_desc);
819
820         lock_res_and_lock(lock);
821         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
822                              lock->l_resource->lr_lvb_len);
823         unlock_res_and_lock(lock);
824         res = lock->l_resource;
825         ptlrpc_request_set_replen(req);
826
827
828         req->rq_send_state = LUSTRE_IMP_FULL;
829         /* ptlrpc_prep_req already set timeout */
830         if (AT_OFF)
831                 req->rq_timeout = ldlm_get_rq_timeout();
832
833         if (lock->l_export && lock->l_export->exp_nid_stats &&
834             lock->l_export->exp_nid_stats->nid_ldlm_stats)
835                 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
836                                      LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
837
838         rc = ptlrpc_queue_wait(req);
839         if (rc == -ELDLM_NO_LOCK_DATA)
840                 LDLM_DEBUG(lock, "lost race - client has a lock but no inode");
841         else if (rc != 0)
842                 rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
843         else
844                 rc = ldlm_res_lvbo_update(res, req->rq_repmsg,
845                                           REPLY_REC_OFF, 1);
846         ptlrpc_req_finished(req);
847         if (rc == -ERESTART)
848                 ldlm_reprocess_all(res);
849
850         RETURN(rc);
851 }
852
853 #ifdef __KERNEL__
854 extern unsigned long long lu_time_stamp_get(void);
855 #else
856 #define lu_time_stamp_get() time(NULL)
857 #endif
858
859 static void ldlm_svc_get_eopc(const struct ldlm_request *dlm_req,
860                        struct lprocfs_stats *srv_stats)
861 {
862         int lock_type = 0, op = 0;
863
864         lock_type = dlm_req->lock_desc.l_resource.lr_type;
865
866         switch (lock_type) {
867         case LDLM_PLAIN:
868                 op = PTLRPC_LAST_CNTR + LDLM_PLAIN_ENQUEUE;
869                 break;
870         case LDLM_EXTENT:
871                 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT)
872                         op = PTLRPC_LAST_CNTR + LDLM_GLIMPSE_ENQUEUE;
873                 else
874                         op = PTLRPC_LAST_CNTR + LDLM_EXTENT_ENQUEUE;
875                 break;
876         case LDLM_FLOCK:
877                 op = PTLRPC_LAST_CNTR + LDLM_FLOCK_ENQUEUE;
878                 break;
879         case LDLM_IBITS:
880                 op = PTLRPC_LAST_CNTR + LDLM_IBITS_ENQUEUE;
881                 break;
882         default:
883                 op = 0;
884                 break;
885         }
886
887         if (op)
888                 lprocfs_counter_incr(srv_stats, op);
889
890         return ;
891 }
892
893 /*
894  * Main server-side entry point into LDLM. This is called by ptlrpc service
895  * threads to carry out client lock enqueueing requests.
896  */
897 int ldlm_handle_enqueue0(struct ldlm_namespace *ns,
898                          struct ptlrpc_request *req,
899                          const struct ldlm_request *dlm_req,
900                          const struct ldlm_callback_suite *cbs)
901 {
902         struct ldlm_reply *dlm_rep;
903         __u32 flags;
904         ldlm_error_t err = ELDLM_OK;
905         struct ldlm_lock *lock = NULL;
906         void *cookie = NULL;
907         int rc = 0;
908         ENTRY;
909
910         LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
911
912         ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF);
913         flags = dlm_req->lock_flags;
914
915         LASSERT(req->rq_export);
916
917         if (req->rq_rqbd->rqbd_service->srv_stats)
918                 ldlm_svc_get_eopc(dlm_req,
919                                   req->rq_rqbd->rqbd_service->srv_stats);
920
921         if (req->rq_export && req->rq_export->exp_nid_stats &&
922             req->rq_export->exp_nid_stats->nid_ldlm_stats)
923                 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
924                                      LDLM_ENQUEUE - LDLM_FIRST_OPC);
925
926         if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE ||
927                      dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) {
928                 DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
929                           dlm_req->lock_desc.l_resource.lr_type);
930                 GOTO(out, rc = -EFAULT);
931         }
932
933         if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE ||
934                      dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE ||
935                      dlm_req->lock_desc.l_req_mode &
936                      (dlm_req->lock_desc.l_req_mode-1))) {
937                 DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
938                           dlm_req->lock_desc.l_req_mode);
939                 GOTO(out, rc = -EFAULT);
940         }
941
942         if (req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) {
943                 if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
944                              LDLM_PLAIN)) {
945                         DEBUG_REQ(D_ERROR, req,
946                                   "PLAIN lock request from IBITS client?");
947                         GOTO(out, rc = -EPROTO);
948                 }
949         } else if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
950                             LDLM_IBITS)) {
951                 DEBUG_REQ(D_ERROR, req,
952                           "IBITS lock request from unaware client?");
953                 GOTO(out, rc = -EPROTO);
954         }
955
956 #if 0
957         /* FIXME this makes it impossible to use LDLM_PLAIN locks -- check
958            against server's _CONNECT_SUPPORTED flags? (I don't want to use
959            ibits for mgc/mgs) */
960
961         /* INODEBITS_INTEROP: Perform conversion from plain lock to
962          * inodebits lock if client does not support them. */
963         if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) &&
964             (dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN)) {
965                 dlm_req->lock_desc.l_resource.lr_type = LDLM_IBITS;
966                 dlm_req->lock_desc.l_policy_data.l_inodebits.bits =
967                         MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE;
968                 if (dlm_req->lock_desc.l_req_mode == LCK_PR)
969                         dlm_req->lock_desc.l_req_mode = LCK_CR;
970         }
971 #endif
972
973         if (unlikely(flags & LDLM_FL_REPLAY)) {
974                 /* Find an existing lock in the per-export lock hash */
975                 lock = lustre_hash_lookup(req->rq_export->exp_lock_hash,
976                                           (void *)&dlm_req->lock_handle[0]);
977                 if (lock != NULL) {
978                         DEBUG_REQ(D_DLMTRACE, req, "found existing lock cookie "
979                                   LPX64, lock->l_handle.h_cookie);
980                         GOTO(existing_lock, rc = 0);
981                 }
982         }
983
984         /* The lock's callback data might be set in the policy function */
985         lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
986                                 dlm_req->lock_desc.l_resource.lr_type,
987                                 dlm_req->lock_desc.l_req_mode,
988                                 cbs, NULL, 0);
989
990         if (!lock)
991                 GOTO(out, rc = -ENOMEM);
992
993         do_gettimeofday(&lock->l_enqueued_time);
994         lock->l_remote_handle = dlm_req->lock_handle[0];
995         LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
996
997         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
998         /* Don't enqueue a lock onto the export if it has already
999          * been evicted.  Cancel it now instead. (bug 3822) */
1000         if (req->rq_export->exp_failed) {
1001                 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1002                 GOTO(out, rc = -ENOTCONN);
1003         }
1004         lock->l_export = class_export_get(req->rq_export);
1005
1006         if (lock->l_export->exp_lock_hash)
1007                 lustre_hash_add(lock->l_export->exp_lock_hash,
1008                                 &lock->l_remote_handle,
1009                                 &lock->l_exp_hash);
1010
1011 existing_lock:
1012
1013         if (flags & LDLM_FL_HAS_INTENT) {
1014                 /* In this case, the reply buffer is allocated deep in
1015                  * local_lock_enqueue by the policy function. */
1016                 cookie = req;
1017         } else {
1018                 lock_res_and_lock(lock);
1019                 if (lock->l_resource->lr_lvb_len) {
1020                         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
1021                                              RCL_SERVER,
1022                                              lock->l_resource->lr_lvb_len);
1023                 }
1024                 unlock_res_and_lock(lock);
1025
1026                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
1027                         GOTO(out, rc = -ENOMEM);
1028
1029                 rc = req_capsule_server_pack(&req->rq_pill);
1030                 if (rc)
1031                         GOTO(out, rc);
1032         }
1033
1034         if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN)
1035                 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1036         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
1037                 lock->l_req_extent = lock->l_policy_data.l_extent;
1038
1039         err = ldlm_lock_enqueue(ns, &lock, cookie, (int *)&flags);
1040         if (err)
1041                 GOTO(out, err);
1042
1043         dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1044         dlm_rep->lock_flags = flags;
1045
1046         ldlm_lock2desc(lock, &dlm_rep->lock_desc);
1047         ldlm_lock2handle(lock, &dlm_rep->lock_handle);
1048
1049         /* We never send a blocking AST until the lock is granted, but
1050          * we can tell it right now */
1051         lock_res_and_lock(lock);
1052
1053         /* Now take into account flags to be inherited from original lock
1054            request both in reply to client and in our own lock flags. */
1055         dlm_rep->lock_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1056         lock->l_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1057
1058         /* Don't move a pending lock onto the export if it has already
1059          * been evicted.  Cancel it now instead. (bug 5683) */
1060         if (unlikely(req->rq_export->exp_failed ||
1061                      OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
1062                 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1063                 rc = -ENOTCONN;
1064         } else if (lock->l_flags & LDLM_FL_AST_SENT) {
1065                 dlm_rep->lock_flags |= LDLM_FL_AST_SENT;
1066                 if (lock->l_granted_mode == lock->l_req_mode) {
1067                         /*
1068                          * Only cancel lock if it was granted, because it would
1069                          * be destroyed immediatelly and would never be granted
1070                          * in the future, causing timeouts on client.  Not
1071                          * granted lock will be cancelled immediatelly after
1072                          * sending completion AST.
1073                          */
1074                         if (dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1075                                 unlock_res_and_lock(lock);
1076                                 ldlm_lock_cancel(lock);
1077                                 lock_res_and_lock(lock);
1078                         } else
1079                                 ldlm_add_waiting_lock(lock);
1080                 }
1081         }
1082         /* Make sure we never ever grant usual metadata locks to liblustre
1083            clients */
1084         if ((dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN ||
1085             dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) &&
1086              req->rq_export->exp_libclient) {
1087                 if (unlikely(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) ||
1088                              !(dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK))){
1089                         CERROR("Granting sync lock to libclient. "
1090                                "req fl %d, rep fl %d, lock fl %d\n",
1091                                dlm_req->lock_flags, dlm_rep->lock_flags,
1092                                lock->l_flags);
1093                         LDLM_ERROR(lock, "sync lock");
1094                         if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT) {
1095                                 struct ldlm_intent *it;
1096
1097                                 it = req_capsule_client_get(&req->rq_pill,
1098                                                             &RMF_LDLM_INTENT);
1099                                 if (it != NULL) {
1100                                         CERROR("This is intent %s ("LPU64")\n",
1101                                                ldlm_it2str(it->opc), it->opc);
1102                                 }
1103                         }
1104                 }
1105         }
1106
1107         unlock_res_and_lock(lock);
1108
1109         EXIT;
1110  out:
1111         req->rq_status = rc ?: err; /* return either error - bug 11190 */
1112         if (!req->rq_packed_final) {
1113                 err = lustre_pack_reply(req, 1, NULL, NULL);
1114                 if (rc == 0)
1115                         rc = err;
1116         }
1117
1118         /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
1119          * ldlm_reprocess_all.  If this moves, revisit that code. -phil */
1120         if (lock) {
1121                 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
1122                            "(err=%d, rc=%d)", err, rc);
1123
1124                 lock_res_and_lock(lock);
1125                 if (rc == 0) {
1126                         if (lock->l_resource->lr_lvb_len > 0) {
1127                                 void *lvb;
1128
1129                                 lvb = req_capsule_server_get(&req->rq_pill,
1130                                                              &RMF_DLM_LVB);
1131                                 LASSERTF(lvb != NULL, "req %p, lock %p\n",
1132                                          req, lock);
1133
1134                                 memcpy(lvb, lock->l_resource->lr_lvb_data,
1135                                        lock->l_resource->lr_lvb_len);
1136                         }
1137                 } else {
1138                         ldlm_resource_unlink_lock(lock);
1139                         ldlm_lock_destroy_nolock(lock);
1140                 }
1141                 unlock_res_and_lock(lock);
1142
1143                 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
1144                         ldlm_reprocess_all(lock->l_resource);
1145
1146                 LDLM_LOCK_RELEASE(lock);
1147         }
1148
1149         LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
1150                           lock, rc);
1151
1152         return rc;
1153 }
1154
1155 int ldlm_handle_enqueue(struct ptlrpc_request *req,
1156                         ldlm_completion_callback completion_callback,
1157                         ldlm_blocking_callback blocking_callback,
1158                         ldlm_glimpse_callback glimpse_callback)
1159 {
1160         struct ldlm_request *dlm_req;
1161         struct ldlm_callback_suite cbs = {
1162                 .lcs_completion = completion_callback,
1163                 .lcs_blocking   = blocking_callback,
1164                 .lcs_glimpse    = glimpse_callback
1165         };
1166         int rc;
1167
1168         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1169         if (dlm_req != NULL) {
1170                 rc = ldlm_handle_enqueue0(req->rq_export->exp_obd->obd_namespace,
1171                                           req, dlm_req, &cbs);
1172         } else {
1173                 rc = -EFAULT;
1174         }
1175         return rc;
1176 }
1177
1178 int ldlm_handle_convert0(struct ptlrpc_request *req,
1179                          const struct ldlm_request *dlm_req)
1180 {
1181         struct ldlm_reply *dlm_rep;
1182         struct ldlm_lock *lock;
1183         int rc;
1184         ENTRY;
1185
1186         if (req->rq_export && req->rq_export->exp_nid_stats &&
1187             req->rq_export->exp_nid_stats->nid_ldlm_stats)
1188                 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1189                                      LDLM_CONVERT - LDLM_FIRST_OPC);
1190
1191         rc = req_capsule_server_pack(&req->rq_pill);
1192         if (rc)
1193                 RETURN(rc);
1194
1195         dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1196         dlm_rep->lock_flags = dlm_req->lock_flags;
1197
1198         lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
1199         if (!lock) {
1200                 req->rq_status = EINVAL;
1201         } else {
1202                 void *res = NULL;
1203
1204                 LDLM_DEBUG(lock, "server-side convert handler START");
1205
1206                 do_gettimeofday(&lock->l_enqueued_time);
1207                 res = ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
1208                                         &dlm_rep->lock_flags);
1209                 if (res) {
1210                         if (ldlm_del_waiting_lock(lock))
1211                                 LDLM_DEBUG(lock, "converted waiting lock");
1212                         req->rq_status = 0;
1213                 } else {
1214                         req->rq_status = EDEADLOCK;
1215                 }
1216         }
1217
1218         if (lock) {
1219                 if (!req->rq_status)
1220                         ldlm_reprocess_all(lock->l_resource);
1221                 LDLM_DEBUG(lock, "server-side convert handler END");
1222                 LDLM_LOCK_PUT(lock);
1223         } else
1224                 LDLM_DEBUG_NOLOCK("server-side convert handler END");
1225
1226         RETURN(0);
1227 }
1228
1229 int ldlm_handle_convert(struct ptlrpc_request *req)
1230 {
1231         int rc;
1232         struct ldlm_request *dlm_req;
1233
1234         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1235         if (dlm_req != NULL) {
1236                 rc = ldlm_handle_convert0(req, dlm_req);
1237         } else {
1238                 CERROR ("Can't unpack dlm_req\n");
1239                 rc = -EFAULT;
1240         }
1241         return rc;
1242 }
1243
1244 /* Cancel all the locks whos handles are packed into ldlm_request */
1245 int ldlm_request_cancel(struct ptlrpc_request *req,
1246                         const struct ldlm_request *dlm_req, int first)
1247 {
1248         struct ldlm_resource *res, *pres = NULL;
1249         struct ldlm_lock *lock;
1250         int i, count, done = 0;
1251         ENTRY;
1252
1253         count = dlm_req->lock_count ? dlm_req->lock_count : 1;
1254         if (first >= count)
1255                 RETURN(0);
1256
1257         /* There is no lock on the server at the replay time,
1258          * skip lock cancelling to make replay tests to pass. */
1259         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1260                 RETURN(0);
1261
1262         LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, "
1263                           "starting at %d", count, first);
1264
1265         for (i = first; i < count; i++) {
1266                 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
1267                 if (!lock) {
1268                         LDLM_DEBUG_NOLOCK("server-side cancel handler stale "
1269                                           "lock (cookie "LPU64")",
1270                                           dlm_req->lock_handle[i].cookie);
1271                         continue;
1272                 }
1273
1274                 res = lock->l_resource;
1275                 done++;
1276
1277                 if (res != pres) {
1278                         if (pres != NULL) {
1279                                 ldlm_reprocess_all(pres);
1280                                 LDLM_RESOURCE_DELREF(pres);
1281                                 ldlm_resource_putref(pres);
1282                         }
1283                         if (res != NULL) {
1284                                 ldlm_resource_getref(res);
1285                                 LDLM_RESOURCE_ADDREF(res);
1286                                 ldlm_res_lvbo_update(res, NULL, 0, 1);
1287                         }
1288                         pres = res;
1289                 }
1290                 ldlm_lock_cancel(lock);
1291                 LDLM_LOCK_PUT(lock);
1292         }
1293         if (pres != NULL) {
1294                 ldlm_reprocess_all(pres);
1295                 LDLM_RESOURCE_DELREF(pres);
1296                 ldlm_resource_putref(pres);
1297         }
1298         LDLM_DEBUG_NOLOCK("server-side cancel handler END");
1299         RETURN(done);
1300 }
1301
1302 int ldlm_handle_cancel(struct ptlrpc_request *req)
1303 {
1304         struct ldlm_request *dlm_req;
1305         int rc;
1306         ENTRY;
1307
1308         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1309         if (dlm_req == NULL) {
1310                 CDEBUG(D_INFO, "bad request buffer for cancel\n");
1311                 RETURN(-EFAULT);
1312         }
1313
1314         if (req->rq_export && req->rq_export->exp_nid_stats &&
1315             req->rq_export->exp_nid_stats->nid_ldlm_stats)
1316                 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1317                                      LDLM_CANCEL - LDLM_FIRST_OPC);
1318
1319         rc = req_capsule_server_pack(&req->rq_pill);
1320         if (rc)
1321                 RETURN(rc);
1322
1323         if (!ldlm_request_cancel(req, dlm_req, 0))
1324                 req->rq_status = ESTALE;
1325
1326         if (ptlrpc_reply(req) != 0)
1327                 LBUG();
1328
1329         RETURN(0);
1330 }
1331
1332 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
1333                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1334 {
1335         int do_ast;
1336         ENTRY;
1337
1338         LDLM_DEBUG(lock, "client blocking AST callback handler START");
1339
1340         lock_res_and_lock(lock);
1341         lock->l_flags |= LDLM_FL_CBPENDING;
1342
1343         if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
1344                 lock->l_flags |= LDLM_FL_CANCEL;
1345
1346         do_ast = (!lock->l_readers && !lock->l_writers);
1347         unlock_res_and_lock(lock);
1348
1349         if (do_ast) {
1350                 LDLM_DEBUG(lock, "already unused, calling "
1351                            "callback (%p)", lock->l_blocking_ast);
1352                 if (lock->l_blocking_ast != NULL)
1353                         lock->l_blocking_ast(lock, ld, lock->l_ast_data,
1354                                              LDLM_CB_BLOCKING);
1355         } else {
1356                 LDLM_DEBUG(lock, "Lock still has references, will be"
1357                            " cancelled later");
1358         }
1359
1360         LDLM_DEBUG(lock, "client blocking callback handler END");
1361         LDLM_LOCK_RELEASE(lock);
1362         EXIT;
1363 }
1364
1365 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
1366                                     struct ldlm_namespace *ns,
1367                                     struct ldlm_request *dlm_req,
1368                                     struct ldlm_lock *lock)
1369 {
1370         CFS_LIST_HEAD(ast_list);
1371         ENTRY;
1372
1373         LDLM_DEBUG(lock, "client completion callback handler START");
1374
1375         if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) {
1376                 int to = cfs_time_seconds(1);
1377                 while (to > 0) {
1378                         cfs_schedule_timeout(CFS_TASK_INTERRUPTIBLE, to);
1379                         if (lock->l_granted_mode == lock->l_req_mode ||
1380                             lock->l_destroyed)
1381                                 break;
1382                 }
1383         }
1384
1385         lock_res_and_lock(lock);
1386         if (lock->l_destroyed ||
1387             lock->l_granted_mode == lock->l_req_mode) {
1388                 /* bug 11300: the lock has already been granted */
1389                 unlock_res_and_lock(lock);
1390                 LDLM_DEBUG(lock, "Double grant race happened");
1391                 LDLM_LOCK_RELEASE(lock);
1392                 EXIT;
1393                 return;
1394         }
1395
1396         /* If we receive the completion AST before the actual enqueue returned,
1397          * then we might need to switch lock modes, resources, or extents. */
1398         if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
1399                 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
1400                 LDLM_DEBUG(lock, "completion AST, new lock mode");
1401         }
1402
1403         if (lock->l_resource->lr_type != LDLM_PLAIN) {
1404                 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1405                 LDLM_DEBUG(lock, "completion AST, new policy data");
1406         }
1407
1408         ldlm_resource_unlink_lock(lock);
1409         if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
1410                    &lock->l_resource->lr_name,
1411                    sizeof(lock->l_resource->lr_name)) != 0) {
1412                 unlock_res_and_lock(lock);
1413                 if (ldlm_lock_change_resource(ns, lock,
1414                                 &dlm_req->lock_desc.l_resource.lr_name) != 0) {
1415                         LDLM_ERROR(lock, "Failed to allocate resource");
1416                         LDLM_LOCK_RELEASE(lock);
1417                         EXIT;
1418                         return;
1419                 }
1420                 LDLM_DEBUG(lock, "completion AST, new resource");
1421                 CERROR("change resource!\n");
1422                 lock_res_and_lock(lock);
1423         }
1424
1425         if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
1426                 /* BL_AST locks are not needed in lru.
1427                  * let ldlm_cancel_lru() be fast. */
1428                 ldlm_lock_remove_from_lru(lock);
1429                 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
1430                 LDLM_DEBUG(lock, "completion AST includes blocking AST");
1431         }
1432
1433         if (lock->l_lvb_len) {
1434                 if (req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB,
1435                                          RCL_CLIENT) < lock->l_lvb_len) {
1436                         LDLM_ERROR(lock, "completion AST did not contain "
1437                                    "expected LVB!");
1438                 } else {
1439                         void *lvb = req_capsule_client_swab_get(&req->rq_pill,
1440                                                                 &RMF_DLM_LVB,
1441                                                   (void *)lock->l_lvb_swabber);
1442                         memcpy(lock->l_lvb_data, lvb, lock->l_lvb_len);
1443                 }
1444         }
1445
1446         ldlm_grant_lock(lock, &ast_list);
1447         unlock_res_and_lock(lock);
1448
1449         LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
1450
1451         ldlm_run_ast_work(&ast_list, LDLM_WORK_CP_AST);
1452
1453         LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
1454                           lock);
1455         LDLM_LOCK_RELEASE(lock);
1456         EXIT;
1457 }
1458
1459 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
1460                                     struct ldlm_namespace *ns,
1461                                     struct ldlm_request *dlm_req,
1462                                     struct ldlm_lock *lock)
1463 {
1464         int rc = -ENOSYS;
1465         ENTRY;
1466
1467         LDLM_DEBUG(lock, "client glimpse AST callback handler");
1468
1469         if (lock->l_glimpse_ast != NULL)
1470                 rc = lock->l_glimpse_ast(lock, req);
1471
1472         if (req->rq_repmsg != NULL) {
1473                 ptlrpc_reply(req);
1474         } else {
1475                 req->rq_status = rc;
1476                 ptlrpc_error(req);
1477         }
1478
1479         lock_res_and_lock(lock);
1480         if (lock->l_granted_mode == LCK_PW &&
1481             !lock->l_readers && !lock->l_writers &&
1482             cfs_time_after(cfs_time_current(),
1483                            cfs_time_add(lock->l_last_used,
1484                                         cfs_time_seconds(10)))) {
1485                 unlock_res_and_lock(lock);
1486                 if (ldlm_bl_to_thread_lock(ns, NULL, lock))
1487                         ldlm_handle_bl_callback(ns, NULL, lock);
1488
1489                 EXIT;
1490                 return;
1491         }
1492         unlock_res_and_lock(lock);
1493         LDLM_LOCK_RELEASE(lock);
1494         EXIT;
1495 }
1496
1497 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1498 {
1499         if (req->rq_no_reply)
1500                 return 0;
1501
1502         req->rq_status = rc;
1503         if (!req->rq_packed_final) {
1504                 rc = lustre_pack_reply(req, 1, NULL, NULL);
1505                 if (rc)
1506                         return rc;
1507         }
1508         return ptlrpc_reply(req);
1509 }
1510
1511 #ifdef __KERNEL__
1512 static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
1513                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock,
1514                              struct list_head *cancels, int count)
1515 {
1516         struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1517         struct ldlm_bl_work_item *blwi;
1518         ENTRY;
1519
1520         if (cancels && count == 0)
1521                 RETURN(0);
1522
1523         OBD_ALLOC(blwi, sizeof(*blwi));
1524         if (blwi == NULL)
1525                 RETURN(-ENOMEM);
1526
1527         blwi->blwi_ns = ns;
1528         if (ld != NULL)
1529                 blwi->blwi_ld = *ld;
1530         if (count) {
1531                 list_add(&blwi->blwi_head, cancels);
1532                 list_del_init(cancels);
1533                 blwi->blwi_count = count;
1534         } else {
1535                 blwi->blwi_lock = lock;
1536         }
1537         spin_lock(&blp->blp_lock);
1538         if (lock && lock->l_flags & LDLM_FL_DISCARD_DATA) {
1539                 /* add LDLM_FL_DISCARD_DATA requests to the priority list */
1540                 list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
1541         } else {
1542                 /* other blocking callbacks are added to the regular list */
1543                 list_add_tail(&blwi->blwi_entry, &blp->blp_list);
1544         }
1545         cfs_waitq_signal(&blp->blp_waitq);
1546         spin_unlock(&blp->blp_lock);
1547
1548         RETURN(0);
1549 }
1550 #endif
1551
1552 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1553                            struct ldlm_lock *lock)
1554 {
1555 #ifdef __KERNEL__
1556         RETURN(ldlm_bl_to_thread(ns, ld, lock, NULL, 0));
1557 #else
1558         RETURN(-ENOSYS);
1559 #endif
1560 }
1561
1562 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1563                            struct list_head *cancels, int count)
1564 {
1565 #ifdef __KERNEL__
1566         RETURN(ldlm_bl_to_thread(ns, ld, NULL, cancels, count));
1567 #else
1568         RETURN(-ENOSYS);
1569 #endif
1570 }
1571
1572 /* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */
1573 static int ldlm_callback_handler(struct ptlrpc_request *req)
1574 {
1575         struct ldlm_namespace *ns;
1576         struct ldlm_request *dlm_req;
1577         struct ldlm_lock *lock;
1578         int rc;
1579         ENTRY;
1580
1581         /* Requests arrive in sender's byte order.  The ptlrpc service
1582          * handler has already checked and, if necessary, byte-swapped the
1583          * incoming request message body, but I am responsible for the
1584          * message buffers. */
1585
1586         /* do nothing for sec context finalize */
1587         if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI)
1588                 RETURN(0);
1589
1590         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
1591
1592         if (req->rq_export == NULL) {
1593                 struct ldlm_request *dlm_req;
1594
1595                 CDEBUG(D_RPCTRACE, "operation %d from %s with bad "
1596                        "export cookie "LPX64"; this is "
1597                        "normal if this node rebooted with a lock held\n",
1598                        lustre_msg_get_opc(req->rq_reqmsg),
1599                        libcfs_id2str(req->rq_peer),
1600                        lustre_msg_get_handle(req->rq_reqmsg)->cookie);
1601
1602                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1603                 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1604                 if (dlm_req != NULL)
1605                         CDEBUG(D_RPCTRACE, "--> lock cookie: "LPX64"\n",
1606                                dlm_req->lock_handle[0].cookie);
1607
1608                 ldlm_callback_reply(req, -ENOTCONN);
1609                 RETURN(0);
1610         }
1611
1612         LASSERT(req->rq_export != NULL);
1613         LASSERT(req->rq_export->exp_obd != NULL);
1614
1615         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1616         case LDLM_BL_CALLBACK:
1617                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK))
1618                         RETURN(0);
1619                 break;
1620         case LDLM_CP_CALLBACK:
1621                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK))
1622                         RETURN(0);
1623                 break;
1624         case LDLM_GL_CALLBACK:
1625                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK))
1626                         RETURN(0);
1627                 break;
1628         case OBD_LOG_CANCEL: /* remove this eventually - for 1.4.0 compat */
1629                 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
1630                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
1631                         RETURN(0);
1632                 rc = llog_origin_handle_cancel(req);
1633                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_REP))
1634                         RETURN(0);
1635                 ldlm_callback_reply(req, rc);
1636                 RETURN(0);
1637         case OBD_QC_CALLBACK:
1638                 req_capsule_set(&req->rq_pill, &RQF_QC_CALLBACK);
1639                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_QC_CALLBACK_NET))
1640                         RETURN(0);
1641                 rc = target_handle_qc_callback(req);
1642                 ldlm_callback_reply(req, rc);
1643                 RETURN(0);
1644         case QUOTA_DQACQ:
1645         case QUOTA_DQREL:
1646                 /* reply in handler */
1647                 req_capsule_set(&req->rq_pill, &RQF_MDS_QUOTA_DQACQ);
1648                 rc = target_handle_dqacq_callback(req);
1649                 RETURN(0);
1650         case LLOG_ORIGIN_HANDLE_CREATE:
1651                 req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
1652                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1653                         RETURN(0);
1654                 rc = llog_origin_handle_create(req);
1655                 ldlm_callback_reply(req, rc);
1656                 RETURN(0);
1657         case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
1658                 req_capsule_set(&req->rq_pill,
1659                                 &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
1660                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1661                         RETURN(0);
1662                 rc = llog_origin_handle_next_block(req);
1663                 ldlm_callback_reply(req, rc);
1664                 RETURN(0);
1665         case LLOG_ORIGIN_HANDLE_READ_HEADER:
1666                 req_capsule_set(&req->rq_pill,
1667                                 &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER);
1668                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1669                         RETURN(0);
1670                 rc = llog_origin_handle_read_header(req);
1671                 ldlm_callback_reply(req, rc);
1672                 RETURN(0);
1673         case LLOG_ORIGIN_HANDLE_CLOSE:
1674                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1675                         RETURN(0);
1676                 rc = llog_origin_handle_close(req);
1677                 ldlm_callback_reply(req, rc);
1678                 RETURN(0);
1679         default:
1680                 CERROR("unknown opcode %u\n",
1681                        lustre_msg_get_opc(req->rq_reqmsg));
1682                 ldlm_callback_reply(req, -EPROTO);
1683                 RETURN(0);
1684         }
1685
1686         ns = req->rq_export->exp_obd->obd_namespace;
1687         LASSERT(ns != NULL);
1688
1689         req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1690
1691         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1692         if (dlm_req == NULL) {
1693                 ldlm_callback_reply(req, -EPROTO);
1694                 RETURN(0);
1695         }
1696
1697         /* Force a known safe race, send a cancel to the server for a lock
1698          * which the server has already started a blocking callback on. */
1699         if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE) &&
1700             lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1701                 rc = ldlm_cli_cancel(&dlm_req->lock_handle[0]);
1702                 if (rc < 0)
1703                         CERROR("ldlm_cli_cancel: %d\n", rc);
1704         }
1705
1706         lock = ldlm_handle2lock_long(&dlm_req->lock_handle[0], 0);
1707         if (!lock) {
1708                 CDEBUG(D_DLMTRACE, "callback on lock "LPX64" - lock "
1709                        "disappeared\n", dlm_req->lock_handle[0].cookie);
1710                 ldlm_callback_reply(req, -EINVAL);
1711                 RETURN(0);
1712         }
1713
1714         /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
1715         lock_res_and_lock(lock);
1716         lock->l_flags |= (dlm_req->lock_flags & LDLM_AST_FLAGS);
1717         if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1718                 /* If somebody cancels locks and cache is already droped,
1719                  * we can tell the server we have no lock. Otherwise, we
1720                  * should send cancel after dropping the cache. */
1721                 if ((lock->l_flags & LDLM_FL_CANCELING) &&
1722                     (lock->l_flags & LDLM_FL_BL_DONE)) {
1723                         LDLM_DEBUG(lock, "callback on lock "
1724                                    LPX64" - lock disappeared\n",
1725                                    dlm_req->lock_handle[0].cookie);
1726                         unlock_res_and_lock(lock);
1727                         LDLM_LOCK_RELEASE(lock);
1728                         ldlm_callback_reply(req, -EINVAL);
1729                         RETURN(0);
1730                 }
1731                 /* BL_AST locks are not needed in lru.
1732                  * let ldlm_cancel_lru() be fast. */
1733                 ldlm_lock_remove_from_lru(lock);
1734                 lock->l_flags |= LDLM_FL_BL_AST;
1735         }
1736         unlock_res_and_lock(lock);
1737
1738         /* We want the ost thread to get this reply so that it can respond
1739          * to ost requests (write cache writeback) that might be triggered
1740          * in the callback.
1741          *
1742          * But we'd also like to be able to indicate in the reply that we're
1743          * cancelling right now, because it's unused, or have an intent result
1744          * in the reply, so we might have to push the responsibility for sending
1745          * the reply down into the AST handlers, alas. */
1746
1747         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1748         case LDLM_BL_CALLBACK:
1749                 CDEBUG(D_INODE, "blocking ast\n");
1750                 req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
1751                 if (!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK))
1752                         ldlm_callback_reply(req, 0);
1753                 if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
1754                         ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
1755                 break;
1756         case LDLM_CP_CALLBACK:
1757                 CDEBUG(D_INODE, "completion ast\n");
1758                 req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
1759                 ldlm_callback_reply(req, 0);
1760                 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
1761                 break;
1762         case LDLM_GL_CALLBACK:
1763                 CDEBUG(D_INODE, "glimpse ast\n");
1764                 req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
1765                 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
1766                 break;
1767         default:
1768                 LBUG();                         /* checked above */
1769         }
1770
1771         RETURN(0);
1772 }
1773
1774 static int ldlm_cancel_handler(struct ptlrpc_request *req)
1775 {
1776         int rc;
1777         ENTRY;
1778
1779         /* Requests arrive in sender's byte order.  The ptlrpc service
1780          * handler has already checked and, if necessary, byte-swapped the
1781          * incoming request message body, but I am responsible for the
1782          * message buffers. */
1783
1784         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
1785
1786         if (req->rq_export == NULL) {
1787                 struct ldlm_request *dlm_req;
1788
1789                 CERROR("operation %d from %s with bad export cookie "LPU64"\n",
1790                        lustre_msg_get_opc(req->rq_reqmsg),
1791                        libcfs_id2str(req->rq_peer),
1792                        lustre_msg_get_handle(req->rq_reqmsg)->cookie);
1793
1794                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1795                 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1796                 if (dlm_req != NULL)
1797                         ldlm_lock_dump_handle(D_ERROR,
1798                                               &dlm_req->lock_handle[0]);
1799                 ldlm_callback_reply(req, -ENOTCONN);
1800                 RETURN(0);
1801         }
1802
1803         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1804
1805         /* XXX FIXME move this back to mds/handler.c, bug 249 */
1806         case LDLM_CANCEL:
1807                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
1808                 CDEBUG(D_INODE, "cancel\n");
1809                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL))
1810                         RETURN(0);
1811                 rc = ldlm_handle_cancel(req);
1812                 if (rc)
1813                         break;
1814                 RETURN(0);
1815         case OBD_LOG_CANCEL:
1816                 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
1817                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
1818                         RETURN(0);
1819                 rc = llog_origin_handle_cancel(req);
1820                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_REP))
1821                         RETURN(0);
1822                 ldlm_callback_reply(req, rc);
1823                 RETURN(0);
1824         default:
1825                 CERROR("invalid opcode %d\n",
1826                        lustre_msg_get_opc(req->rq_reqmsg));
1827                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1828                 ldlm_callback_reply(req, -EINVAL);
1829         }
1830
1831         RETURN(0);
1832 }
1833
1834 void ldlm_revoke_lock_cb(void *obj, void *data)
1835 {
1836         struct list_head   *rpc_list = data;
1837         struct ldlm_lock   *lock = obj;
1838
1839         lock_res_and_lock(lock);
1840
1841         if (lock->l_req_mode != lock->l_granted_mode) {
1842                 unlock_res_and_lock(lock);
1843                 return;
1844         }
1845
1846         LASSERT(lock->l_resource);
1847         if (lock->l_resource->lr_type != LDLM_IBITS &&
1848             lock->l_resource->lr_type != LDLM_PLAIN) {
1849                 unlock_res_and_lock(lock);
1850                 return;
1851         }
1852
1853         if (lock->l_flags & LDLM_FL_AST_SENT) {
1854                 unlock_res_and_lock(lock);
1855                 return;
1856         }
1857
1858         LASSERT(lock->l_blocking_ast);
1859         LASSERT(!lock->l_blocking_lock);
1860
1861         lock->l_flags |= LDLM_FL_AST_SENT;
1862         if (lock->l_export && lock->l_export->exp_lock_hash)
1863                 lustre_hash_del(lock->l_export->exp_lock_hash,
1864                                 &lock->l_remote_handle, &lock->l_exp_hash);
1865         list_add_tail(&lock->l_rk_ast, rpc_list);
1866         LDLM_LOCK_GET(lock);
1867
1868         unlock_res_and_lock(lock);
1869 }
1870
1871 void ldlm_revoke_export_locks(struct obd_export *exp)
1872 {
1873         struct list_head  rpc_list;
1874         ENTRY;
1875
1876         CFS_INIT_LIST_HEAD(&rpc_list);
1877         lustre_hash_for_each_empty(exp->exp_lock_hash,
1878                                    ldlm_revoke_lock_cb, &rpc_list);
1879         ldlm_run_ast_work(&rpc_list, LDLM_WORK_REVOKE_AST);
1880
1881         EXIT;
1882 }
1883
1884 #ifdef __KERNEL__
1885 static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp)
1886 {
1887         struct ldlm_bl_work_item *blwi = NULL;
1888         static unsigned int num_bl = 0;
1889
1890         spin_lock(&blp->blp_lock);
1891         /* process a request from the blp_list at least every blp_num_threads */
1892         if (!list_empty(&blp->blp_list) &&
1893             (list_empty(&blp->blp_prio_list) || num_bl == 0))
1894                 blwi = list_entry(blp->blp_list.next,
1895                                   struct ldlm_bl_work_item, blwi_entry);
1896         else
1897                 if (!list_empty(&blp->blp_prio_list))
1898                         blwi = list_entry(blp->blp_prio_list.next,
1899                                           struct ldlm_bl_work_item, blwi_entry);
1900
1901         if (blwi) {
1902                 if (++num_bl >= atomic_read(&blp->blp_num_threads))
1903                         num_bl = 0;
1904                 list_del(&blwi->blwi_entry);
1905         }
1906         spin_unlock(&blp->blp_lock);
1907
1908         return blwi;
1909 }
1910
1911 /* This only contains temporary data until the thread starts */
1912 struct ldlm_bl_thread_data {
1913         char                    bltd_name[CFS_CURPROC_COMM_MAX];
1914         struct ldlm_bl_pool     *bltd_blp;
1915         struct completion       bltd_comp;
1916         int                     bltd_num;
1917 };
1918
1919 static int ldlm_bl_thread_main(void *arg);
1920
1921 static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp)
1922 {
1923         struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
1924         int rc;
1925
1926         init_completion(&bltd.bltd_comp);
1927         rc = cfs_kernel_thread(ldlm_bl_thread_main, &bltd, 0);
1928         if (rc < 0) {
1929                 CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %d\n",
1930                        atomic_read(&blp->blp_num_threads), rc);
1931                 return rc;
1932         }
1933         wait_for_completion(&bltd.bltd_comp);
1934
1935         return 0;
1936 }
1937
1938 static int ldlm_bl_thread_main(void *arg)
1939 {
1940         struct ldlm_bl_pool *blp;
1941         ENTRY;
1942
1943         {
1944                 struct ldlm_bl_thread_data *bltd = arg;
1945
1946                 blp = bltd->bltd_blp;
1947
1948                 bltd->bltd_num = atomic_inc_return(&blp->blp_num_threads) - 1;
1949                 atomic_inc(&blp->blp_busy_threads);
1950
1951                 snprintf(bltd->bltd_name, sizeof(bltd->bltd_name) - 1,
1952                         "ldlm_bl_%02d", bltd->bltd_num);
1953                 cfs_daemonize(bltd->bltd_name);
1954
1955                 complete(&bltd->bltd_comp);
1956                 /* cannot use bltd after this, it is only on caller's stack */
1957         }
1958
1959         while (1) {
1960                 struct l_wait_info lwi = { 0 };
1961                 struct ldlm_bl_work_item *blwi = NULL;
1962
1963                 blwi = ldlm_bl_get_work(blp);
1964
1965                 if (blwi == NULL) {
1966                         int busy;
1967
1968                         atomic_dec(&blp->blp_busy_threads);
1969                         l_wait_event_exclusive(blp->blp_waitq,
1970                                          (blwi = ldlm_bl_get_work(blp)) != NULL,
1971                                          &lwi);
1972                         busy = atomic_inc_return(&blp->blp_busy_threads);
1973
1974                         if (blwi->blwi_ns == NULL)
1975                                 /* added by ldlm_cleanup() */
1976                                 break;
1977
1978                         /* Not fatal if racy and have a few too many threads */
1979                         if (unlikely(busy < blp->blp_max_threads &&
1980                                     busy >= atomic_read(&blp->blp_num_threads)))
1981                                 /* discard the return value, we tried */
1982                                 ldlm_bl_thread_start(blp);
1983                 } else {
1984                         if (blwi->blwi_ns == NULL)
1985                                 /* added by ldlm_cleanup() */
1986                                 break;
1987                 }
1988
1989                 if (blwi->blwi_count) {
1990                         /* The special case when we cancel locks in lru
1991                          * asynchronously, we pass the list of locks here.
1992                          * Thus lock is marked LDLM_FL_CANCELING, and already
1993                          * canceled locally. */
1994                         ldlm_cli_cancel_list(&blwi->blwi_head,
1995                                              blwi->blwi_count, NULL, 0);
1996                 } else {
1997                         ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
1998                                                 blwi->blwi_lock);
1999                 }
2000                 OBD_FREE(blwi, sizeof(*blwi));
2001         }
2002
2003         atomic_dec(&blp->blp_busy_threads);
2004         atomic_dec(&blp->blp_num_threads);
2005         complete(&blp->blp_comp);
2006         RETURN(0);
2007 }
2008
2009 #endif
2010
2011 static int ldlm_setup(void);
2012 static int ldlm_cleanup(void);
2013
2014 int ldlm_get_ref(void)
2015 {
2016         int rc = 0;
2017         ENTRY;
2018         mutex_down(&ldlm_ref_sem);
2019         if (++ldlm_refcount == 1) {
2020                 rc = ldlm_setup();
2021                 if (rc)
2022                         ldlm_refcount--;
2023         }
2024         mutex_up(&ldlm_ref_sem);
2025
2026         RETURN(rc);
2027 }
2028
2029 void ldlm_put_ref(void)
2030 {
2031         ENTRY;
2032         mutex_down(&ldlm_ref_sem);
2033         if (ldlm_refcount == 1) {
2034                 int rc = ldlm_cleanup();
2035                 if (rc)
2036                         CERROR("ldlm_cleanup failed: %d\n", rc);
2037                 else
2038                         ldlm_refcount--;
2039         } else {
2040                 ldlm_refcount--;
2041         }
2042         mutex_up(&ldlm_ref_sem);
2043
2044         EXIT;
2045 }
2046
2047 /*
2048  * Export handle<->lock hash operations.
2049  */
2050 static unsigned
2051 ldlm_export_lock_hash(lustre_hash_t *lh, void *key, unsigned mask)
2052 {
2053         return lh_u64_hash(((struct lustre_handle *)key)->cookie, mask);
2054 }
2055
2056 static void *
2057 ldlm_export_lock_key(struct hlist_node *hnode)
2058 {
2059         struct ldlm_lock *lock;
2060         ENTRY;
2061
2062         lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2063         RETURN(&lock->l_remote_handle);
2064 }
2065
2066 static int
2067 ldlm_export_lock_compare(void *key, struct hlist_node *hnode)
2068 {
2069         ENTRY;
2070         RETURN(lustre_handle_equal(ldlm_export_lock_key(hnode), key));
2071 }
2072
2073 static void *
2074 ldlm_export_lock_get(struct hlist_node *hnode)
2075 {
2076         struct ldlm_lock *lock;
2077         ENTRY;
2078
2079         lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2080         LDLM_LOCK_GET(lock);
2081
2082         RETURN(lock);
2083 }
2084
2085 static void *
2086 ldlm_export_lock_put(struct hlist_node *hnode)
2087 {
2088         struct ldlm_lock *lock;
2089         ENTRY;
2090
2091         lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2092         LDLM_LOCK_RELEASE(lock);
2093
2094         RETURN(lock);
2095 }
2096
2097 static lustre_hash_ops_t ldlm_export_lock_ops = {
2098         .lh_hash    = ldlm_export_lock_hash,
2099         .lh_key     = ldlm_export_lock_key,
2100         .lh_compare = ldlm_export_lock_compare,
2101         .lh_get     = ldlm_export_lock_get,
2102         .lh_put     = ldlm_export_lock_put
2103 };
2104
2105 int ldlm_init_export(struct obd_export *exp)
2106 {
2107         ENTRY;
2108
2109         exp->exp_lock_hash =
2110                 lustre_hash_init(obd_uuid2str(&exp->exp_client_uuid),
2111                                  128, 65536, &ldlm_export_lock_ops, LH_REHASH);
2112
2113         if (!exp->exp_lock_hash)
2114                 RETURN(-ENOMEM);
2115
2116         RETURN(0);
2117 }
2118 EXPORT_SYMBOL(ldlm_init_export);
2119
2120 void ldlm_destroy_export(struct obd_export *exp)
2121 {
2122         ENTRY;
2123         lustre_hash_exit(exp->exp_lock_hash);
2124         exp->exp_lock_hash = NULL;
2125         EXIT;
2126 }
2127 EXPORT_SYMBOL(ldlm_destroy_export);
2128
2129 static int ldlm_setup(void)
2130 {
2131         struct ldlm_bl_pool *blp;
2132         int rc = 0;
2133         int ldlm_min_threads = LDLM_THREADS_AUTO_MIN;
2134         int ldlm_max_threads = LDLM_THREADS_AUTO_MAX;
2135 #ifdef __KERNEL__
2136         int i;
2137 #endif
2138         ENTRY;
2139
2140         if (ldlm_state != NULL)
2141                 RETURN(-EALREADY);
2142
2143         OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
2144         if (ldlm_state == NULL)
2145                 RETURN(-ENOMEM);
2146
2147 #ifdef LPROCFS
2148         rc = ldlm_proc_setup();
2149         if (rc != 0)
2150                 GOTO(out_free, rc);
2151 #endif
2152
2153 #ifdef __KERNEL__
2154         if (ldlm_num_threads) {
2155                 /* If ldlm_num_threads is set, it is the min and the max. */
2156                 if (ldlm_num_threads > LDLM_THREADS_AUTO_MAX)
2157                         ldlm_num_threads = LDLM_THREADS_AUTO_MAX;
2158                 if (ldlm_num_threads < LDLM_THREADS_AUTO_MIN)
2159                         ldlm_num_threads = LDLM_THREADS_AUTO_MIN;
2160                 ldlm_min_threads = ldlm_max_threads = ldlm_num_threads;
2161         }
2162 #endif
2163
2164         ldlm_state->ldlm_cb_service =
2165                 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2166                                 LDLM_MAXREPSIZE, LDLM_CB_REQUEST_PORTAL,
2167                                 LDLM_CB_REPLY_PORTAL, 1800,
2168                                 ldlm_callback_handler, "ldlm_cbd",
2169                                 ldlm_svc_proc_dir, NULL,
2170                                 ldlm_min_threads, ldlm_max_threads,
2171                                 "ldlm_cb",
2172                                 LCT_MD_THREAD|LCT_DT_THREAD);
2173
2174         if (!ldlm_state->ldlm_cb_service) {
2175                 CERROR("failed to start service\n");
2176                 GOTO(out_proc, rc = -ENOMEM);
2177         }
2178
2179         ldlm_state->ldlm_cancel_service =
2180                 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2181                                 LDLM_MAXREPSIZE, LDLM_CANCEL_REQUEST_PORTAL,
2182                                 LDLM_CANCEL_REPLY_PORTAL, 6000,
2183                                 ldlm_cancel_handler, "ldlm_canceld",
2184                                 ldlm_svc_proc_dir, NULL,
2185                                 ldlm_min_threads, ldlm_max_threads,
2186                                 "ldlm_cn",
2187                                 LCT_MD_THREAD|LCT_DT_THREAD|LCT_CL_THREAD);
2188
2189         if (!ldlm_state->ldlm_cancel_service) {
2190                 CERROR("failed to start service\n");
2191                 GOTO(out_proc, rc = -ENOMEM);
2192         }
2193
2194         OBD_ALLOC(blp, sizeof(*blp));
2195         if (blp == NULL)
2196                 GOTO(out_proc, rc = -ENOMEM);
2197         ldlm_state->ldlm_bl_pool = blp;
2198
2199         spin_lock_init(&blp->blp_lock);
2200         CFS_INIT_LIST_HEAD(&blp->blp_list);
2201         CFS_INIT_LIST_HEAD(&blp->blp_prio_list);
2202         cfs_waitq_init(&blp->blp_waitq);
2203         atomic_set(&blp->blp_num_threads, 0);
2204         atomic_set(&blp->blp_busy_threads, 0);
2205         blp->blp_min_threads = ldlm_min_threads;
2206         blp->blp_max_threads = ldlm_max_threads;
2207
2208 #ifdef __KERNEL__
2209         for (i = 0; i < blp->blp_min_threads; i++) {
2210                 rc = ldlm_bl_thread_start(blp);
2211                 if (rc < 0)
2212                         GOTO(out_thread, rc);
2213         }
2214
2215         rc = ptlrpc_start_threads(NULL, ldlm_state->ldlm_cancel_service);
2216         if (rc)
2217                 GOTO(out_thread, rc);
2218
2219         rc = ptlrpc_start_threads(NULL, ldlm_state->ldlm_cb_service);
2220         if (rc)
2221                 GOTO(out_thread, rc);
2222
2223         CFS_INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
2224         expired_lock_thread.elt_state = ELT_STOPPED;
2225         cfs_waitq_init(&expired_lock_thread.elt_waitq);
2226
2227         CFS_INIT_LIST_HEAD(&waiting_locks_list);
2228         spin_lock_init(&waiting_locks_spinlock);
2229         cfs_timer_init(&waiting_locks_timer, waiting_locks_callback, 0);
2230
2231         rc = cfs_kernel_thread(expired_lock_main, NULL, CLONE_VM | CLONE_FILES);
2232         if (rc < 0) {
2233                 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
2234                 GOTO(out_thread, rc);
2235         }
2236
2237         wait_event(expired_lock_thread.elt_waitq,
2238                    expired_lock_thread.elt_state == ELT_READY);
2239 #endif
2240
2241 #ifdef __KERNEL__
2242         rc = ldlm_pools_init();
2243         if (rc)
2244                 GOTO(out_thread, rc);
2245 #endif
2246         RETURN(0);
2247
2248 #ifdef __KERNEL__
2249  out_thread:
2250         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2251         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2252 #endif
2253
2254  out_proc:
2255 #ifdef LPROCFS
2256         ldlm_proc_cleanup();
2257  out_free:
2258 #endif
2259         OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2260         ldlm_state = NULL;
2261         return rc;
2262 }
2263
2264 static int ldlm_cleanup(void)
2265 {
2266 #ifdef __KERNEL__
2267         struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
2268 #endif
2269         ENTRY;
2270
2271         if (!list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) ||
2272             !list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) {
2273                 CERROR("ldlm still has namespaces; clean these up first.\n");
2274                 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
2275                 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
2276                 RETURN(-EBUSY);
2277         }
2278
2279 #ifdef __KERNEL__
2280         ldlm_pools_fini();
2281 #endif
2282
2283 #ifdef __KERNEL__
2284         while (atomic_read(&blp->blp_num_threads) > 0) {
2285                 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
2286
2287                 init_completion(&blp->blp_comp);
2288
2289                 spin_lock(&blp->blp_lock);
2290                 list_add_tail(&blwi.blwi_entry, &blp->blp_list);
2291                 cfs_waitq_signal(&blp->blp_waitq);
2292                 spin_unlock(&blp->blp_lock);
2293
2294                 wait_for_completion(&blp->blp_comp);
2295         }
2296         OBD_FREE(blp, sizeof(*blp));
2297
2298         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2299         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2300         ldlm_proc_cleanup();
2301
2302         expired_lock_thread.elt_state = ELT_TERMINATE;
2303         cfs_waitq_signal(&expired_lock_thread.elt_waitq);
2304         wait_event(expired_lock_thread.elt_waitq,
2305                    expired_lock_thread.elt_state == ELT_STOPPED);
2306 #else
2307         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2308         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2309 #endif
2310
2311         OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2312         ldlm_state = NULL;
2313
2314         RETURN(0);
2315 }
2316
2317 int __init ldlm_init(void)
2318 {
2319         init_mutex(&ldlm_ref_sem);
2320         init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER));
2321         init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
2322         ldlm_resource_slab = cfs_mem_cache_create("ldlm_resources",
2323                                                sizeof(struct ldlm_resource), 0,
2324                                                SLAB_HWCACHE_ALIGN);
2325         if (ldlm_resource_slab == NULL)
2326                 return -ENOMEM;
2327
2328         ldlm_lock_slab = cfs_mem_cache_create("ldlm_locks",
2329                                            sizeof(struct ldlm_lock), 0,
2330                                            SLAB_HWCACHE_ALIGN);
2331         if (ldlm_lock_slab == NULL) {
2332                 cfs_mem_cache_destroy(ldlm_resource_slab);
2333                 return -ENOMEM;
2334         }
2335
2336         ldlm_interval_slab = cfs_mem_cache_create("interval_node",
2337                                         sizeof(struct ldlm_interval),
2338                                         0, SLAB_HWCACHE_ALIGN);
2339         if (ldlm_interval_slab == NULL) {
2340                 cfs_mem_cache_destroy(ldlm_resource_slab);
2341                 cfs_mem_cache_destroy(ldlm_lock_slab);
2342                 return -ENOMEM;
2343         }
2344
2345         return 0;
2346 }
2347
2348 void __exit ldlm_exit(void)
2349 {
2350         int rc;
2351         if (ldlm_refcount)
2352                 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
2353         rc = cfs_mem_cache_destroy(ldlm_resource_slab);
2354         LASSERTF(rc == 0, "couldn't free ldlm resource slab\n");
2355         rc = cfs_mem_cache_destroy(ldlm_lock_slab);
2356         LASSERTF(rc == 0, "couldn't free ldlm lock slab\n");
2357         rc = cfs_mem_cache_destroy(ldlm_interval_slab);
2358         LASSERTF(rc == 0, "couldn't free interval node slab\n");
2359 }
2360
2361 /* ldlm_extent.c */
2362 EXPORT_SYMBOL(ldlm_extent_shift_kms);
2363
2364 /* ldlm_lock.c */
2365 EXPORT_SYMBOL(ldlm_get_processing_policy);
2366 EXPORT_SYMBOL(ldlm_lock2desc);
2367 EXPORT_SYMBOL(ldlm_register_intent);
2368 EXPORT_SYMBOL(ldlm_lockname);
2369 EXPORT_SYMBOL(ldlm_typename);
2370 EXPORT_SYMBOL(ldlm_lock2handle);
2371 EXPORT_SYMBOL(__ldlm_handle2lock);
2372 EXPORT_SYMBOL(ldlm_lock_get);
2373 EXPORT_SYMBOL(ldlm_lock_put);
2374 EXPORT_SYMBOL(ldlm_lock_fast_match);
2375 EXPORT_SYMBOL(ldlm_lock_fast_release);
2376 EXPORT_SYMBOL(ldlm_lock_match);
2377 EXPORT_SYMBOL(ldlm_lock_cancel);
2378 EXPORT_SYMBOL(ldlm_lock_addref);
2379 EXPORT_SYMBOL(ldlm_lock_addref_try);
2380 EXPORT_SYMBOL(ldlm_lock_decref);
2381 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
2382 EXPORT_SYMBOL(ldlm_lock_change_resource);
2383 EXPORT_SYMBOL(ldlm_lock_set_data);
2384 EXPORT_SYMBOL(ldlm_it2str);
2385 EXPORT_SYMBOL(ldlm_lock_dump);
2386 EXPORT_SYMBOL(ldlm_lock_dump_handle);
2387 EXPORT_SYMBOL(ldlm_cancel_locks_for_export);
2388 EXPORT_SYMBOL(ldlm_reprocess_all_ns);
2389 EXPORT_SYMBOL(ldlm_lock_allow_match);
2390
2391 /* ldlm_request.c */
2392 EXPORT_SYMBOL(ldlm_completion_ast_async);
2393 EXPORT_SYMBOL(ldlm_completion_ast);
2394 EXPORT_SYMBOL(ldlm_blocking_ast);
2395 EXPORT_SYMBOL(ldlm_glimpse_ast);
2396 EXPORT_SYMBOL(ldlm_expired_completion_wait);
2397 EXPORT_SYMBOL(ldlm_prep_enqueue_req);
2398 EXPORT_SYMBOL(ldlm_prep_elc_req);
2399 EXPORT_SYMBOL(ldlm_cli_convert);
2400 EXPORT_SYMBOL(ldlm_cli_enqueue);
2401 EXPORT_SYMBOL(ldlm_cli_enqueue_fini);
2402 EXPORT_SYMBOL(ldlm_cli_enqueue_local);
2403 EXPORT_SYMBOL(ldlm_cli_cancel);
2404 EXPORT_SYMBOL(ldlm_cli_cancel_unused);
2405 EXPORT_SYMBOL(ldlm_cli_cancel_unused_resource);
2406 EXPORT_SYMBOL(ldlm_cli_cancel_req);
2407 EXPORT_SYMBOL(ldlm_replay_locks);
2408 EXPORT_SYMBOL(ldlm_resource_foreach);
2409 EXPORT_SYMBOL(ldlm_namespace_foreach);
2410 EXPORT_SYMBOL(ldlm_namespace_foreach_res);
2411 EXPORT_SYMBOL(ldlm_resource_iterate);
2412 EXPORT_SYMBOL(ldlm_cancel_resource_local);
2413 EXPORT_SYMBOL(ldlm_cli_cancel_list);
2414
2415 /* ldlm_lockd.c */
2416 EXPORT_SYMBOL(ldlm_server_blocking_ast);
2417 EXPORT_SYMBOL(ldlm_server_completion_ast);
2418 EXPORT_SYMBOL(ldlm_server_glimpse_ast);
2419 EXPORT_SYMBOL(ldlm_handle_enqueue);
2420 EXPORT_SYMBOL(ldlm_handle_enqueue0);
2421 EXPORT_SYMBOL(ldlm_handle_cancel);
2422 EXPORT_SYMBOL(ldlm_request_cancel);
2423 EXPORT_SYMBOL(ldlm_handle_convert);
2424 EXPORT_SYMBOL(ldlm_handle_convert0);
2425 EXPORT_SYMBOL(ldlm_del_waiting_lock);
2426 EXPORT_SYMBOL(ldlm_get_ref);
2427 EXPORT_SYMBOL(ldlm_put_ref);
2428 EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
2429 EXPORT_SYMBOL(ldlm_revoke_export_locks);
2430
2431 /* ldlm_resource.c */
2432 EXPORT_SYMBOL(ldlm_namespace_new);
2433 EXPORT_SYMBOL(ldlm_namespace_cleanup);
2434 EXPORT_SYMBOL(ldlm_namespace_free);
2435 EXPORT_SYMBOL(ldlm_namespace_dump);
2436 EXPORT_SYMBOL(ldlm_dump_all_namespaces);
2437 EXPORT_SYMBOL(ldlm_resource_get);
2438 EXPORT_SYMBOL(ldlm_resource_putref);
2439 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
2440
2441 /* ldlm_lib.c */
2442 EXPORT_SYMBOL(client_import_add_conn);
2443 EXPORT_SYMBOL(client_import_del_conn);
2444 EXPORT_SYMBOL(client_obd_setup);
2445 EXPORT_SYMBOL(client_obd_cleanup);
2446 EXPORT_SYMBOL(client_connect_import);
2447 EXPORT_SYMBOL(client_disconnect_export);
2448 EXPORT_SYMBOL(target_start_recovery_thread);
2449 EXPORT_SYMBOL(target_stop_recovery_thread);
2450 EXPORT_SYMBOL(target_handle_connect);
2451 EXPORT_SYMBOL(target_cleanup_recovery);
2452 EXPORT_SYMBOL(target_destroy_export);
2453 EXPORT_SYMBOL(target_cancel_recovery_timer);
2454 EXPORT_SYMBOL(target_send_reply);
2455 EXPORT_SYMBOL(target_queue_recovery_request);
2456 EXPORT_SYMBOL(target_handle_ping);
2457 EXPORT_SYMBOL(target_pack_pool_reply);
2458 EXPORT_SYMBOL(target_handle_disconnect);
2459
2460 /* l_lock.c */
2461 EXPORT_SYMBOL(lock_res_and_lock);
2462 EXPORT_SYMBOL(unlock_res_and_lock);