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LU-13456 ldlm: fix reprocessing of locks with more bits
[fs/lustre-release.git] / lustre / ldlm / ldlm_lockd.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.gnu.org/licenses/gpl-2.0.html
19  *
20  * GPL HEADER END
21  */
22 /*
23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Use is subject to license terms.
25  *
26  * Copyright (c) 2010, 2017, Intel Corporation.
27  */
28 /*
29  * This file is part of Lustre, http://www.lustre.org/
30  *
31  * lustre/ldlm/ldlm_lockd.c
32  *
33  * Author: Peter Braam <braam@clusterfs.com>
34  * Author: Phil Schwan <phil@clusterfs.com>
35  */
36
37 #define DEBUG_SUBSYSTEM S_LDLM
38
39 #include <linux/kthread.h>
40 #include <linux/list.h>
41 #include <libcfs/libcfs.h>
42 #include <libcfs/linux/linux-mem.h>
43 #include <lustre_errno.h>
44 #include <lustre_dlm.h>
45 #include <obd_class.h>
46 #include "ldlm_internal.h"
47
48 static int ldlm_num_threads;
49 module_param(ldlm_num_threads, int, 0444);
50 MODULE_PARM_DESC(ldlm_num_threads, "number of DLM service threads to start");
51
52 static unsigned int ldlm_cpu_bind = 1;
53 module_param(ldlm_cpu_bind, uint, 0444);
54 MODULE_PARM_DESC(ldlm_cpu_bind,
55                  "bind DLM service threads to particular CPU partitions");
56
57 static char *ldlm_cpts;
58 module_param(ldlm_cpts, charp, 0444);
59 MODULE_PARM_DESC(ldlm_cpts, "CPU partitions ldlm threads should run on");
60
61 static DEFINE_MUTEX(ldlm_ref_mutex);
62 static int ldlm_refcount;
63
64 struct kobject *ldlm_kobj;
65 struct kset *ldlm_ns_kset;
66 struct kset *ldlm_svc_kset;
67
68 /* LDLM state */
69
70 static struct ldlm_state *ldlm_state;
71
72 /*
73  * timeout for initial callback (AST) reply (bz10399)
74  * Due to having to send a 32 bit time value over the
75  * wire return it as timeout_t instead of time64_t
76  */
77 static inline timeout_t ldlm_get_rq_timeout(void)
78 {
79         /* Non-AT value */
80         timeout_t timeout = min(ldlm_timeout, obd_timeout / 3);
81
82         return timeout < 1 ? 1 : timeout;
83 }
84
85 struct ldlm_bl_pool {
86         spinlock_t blp_lock;
87
88         /*
89          * blp_prio_list is used for callbacks that should be handled
90          * as a priority. It is used for LDLM_FL_DISCARD_DATA requests.
91          * see b=13843
92          */
93         struct list_head blp_prio_list;
94
95         /*
96          * blp_list is used for all other callbacks which are likely
97          * to take longer to process.
98          */
99         struct list_head blp_list;
100
101         wait_queue_head_t blp_waitq;
102         struct completion blp_comp;
103         atomic_t blp_num_threads;
104         atomic_t blp_busy_threads;
105         int blp_min_threads;
106         int blp_max_threads;
107 };
108
109 struct ldlm_bl_work_item {
110         struct list_head        blwi_entry;
111         struct ldlm_namespace   *blwi_ns;
112         struct ldlm_lock_desc   blwi_ld;
113         struct ldlm_lock        *blwi_lock;
114         struct list_head        blwi_head;
115         int                     blwi_count;
116         struct completion       blwi_comp;
117         enum ldlm_cancel_flags  blwi_flags;
118         int                     blwi_mem_pressure;
119 };
120
121 #ifdef HAVE_SERVER_SUPPORT
122
123 /**
124  * Protects both waiting_locks_list and expired_lock_thread.
125  */
126 static DEFINE_SPINLOCK(waiting_locks_spinlock); /* BH lock (timer) */
127
128 /**
129  * List for contended locks.
130  *
131  * As soon as a lock is contended, it gets placed on this list and
132  * expected time to get a response is filled in the lock. A special
133  * thread walks the list looking for locks that should be released and
134  * schedules client evictions for those that have not been released in
135  * time.
136  *
137  * All access to it should be under waiting_locks_spinlock.
138  */
139 static LIST_HEAD(waiting_locks_list);
140 static void waiting_locks_callback(TIMER_DATA_TYPE unused);
141 static CFS_DEFINE_TIMER(waiting_locks_timer, waiting_locks_callback, 0, 0);
142
143 enum elt_state {
144         ELT_STOPPED,
145         ELT_READY,
146         ELT_TERMINATE,
147 };
148
149 static DECLARE_WAIT_QUEUE_HEAD(expired_lock_wait_queue);
150 static enum elt_state expired_lock_thread_state = ELT_STOPPED;
151 static int expired_lock_dump;
152 static LIST_HEAD(expired_lock_list);
153
154 static int ldlm_lock_busy(struct ldlm_lock *lock);
155 static int ldlm_add_waiting_lock(struct ldlm_lock *lock, timeout_t timeout);
156 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, timeout_t timeout);
157
158 static inline int have_expired_locks(void)
159 {
160         int need_to_run;
161
162         ENTRY;
163         spin_lock_bh(&waiting_locks_spinlock);
164         need_to_run = !list_empty(&expired_lock_list);
165         spin_unlock_bh(&waiting_locks_spinlock);
166
167         RETURN(need_to_run);
168 }
169
170 /**
171  * Check expired lock list for expired locks and time them out.
172  */
173 static int expired_lock_main(void *arg)
174 {
175         struct list_head *expired = &expired_lock_list;
176         int do_dump;
177
178         ENTRY;
179
180         expired_lock_thread_state = ELT_READY;
181         wake_up(&expired_lock_wait_queue);
182
183         while (1) {
184                 wait_event_idle(expired_lock_wait_queue,
185                                 have_expired_locks() ||
186                                 expired_lock_thread_state == ELT_TERMINATE);
187
188                 spin_lock_bh(&waiting_locks_spinlock);
189                 if (expired_lock_dump) {
190                         spin_unlock_bh(&waiting_locks_spinlock);
191
192                         /* from waiting_locks_callback, but not in timer */
193                         libcfs_debug_dumplog();
194
195                         spin_lock_bh(&waiting_locks_spinlock);
196                         expired_lock_dump = 0;
197                 }
198
199                 do_dump = 0;
200
201                 while (!list_empty(expired)) {
202                         struct obd_export *export;
203                         struct ldlm_lock *lock;
204
205                         lock = list_entry(expired->next, struct ldlm_lock,
206                                           l_pending_chain);
207                         if ((void *)lock < LP_POISON + PAGE_SIZE &&
208                             (void *)lock >= LP_POISON) {
209                                 spin_unlock_bh(&waiting_locks_spinlock);
210                                 CERROR("free lock on elt list %p\n", lock);
211                                 LBUG();
212                         }
213                         list_del_init(&lock->l_pending_chain);
214                         if ((void *)lock->l_export <
215                              LP_POISON + PAGE_SIZE &&
216                             (void *)lock->l_export >= LP_POISON) {
217                                 CERROR("lock with free export on elt list %p\n",
218                                        lock->l_export);
219                                 lock->l_export = NULL;
220                                 LDLM_ERROR(lock, "free export");
221                                 /*
222                                  * release extra ref grabbed by
223                                  * ldlm_add_waiting_lock() or
224                                  * ldlm_failed_ast()
225                                  */
226                                 LDLM_LOCK_RELEASE(lock);
227                                 continue;
228                         }
229
230                         if (ldlm_is_destroyed(lock)) {
231                                 /*
232                                  * release the lock refcount where
233                                  * waiting_locks_callback() founds
234                                  */
235                                 LDLM_LOCK_RELEASE(lock);
236                                 continue;
237                         }
238                         export = class_export_lock_get(lock->l_export, lock);
239                         spin_unlock_bh(&waiting_locks_spinlock);
240
241                         /* Check if we need to prolong timeout */
242                         if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT) &&
243                             lock->l_callback_timestamp != 0 && /* not AST error */
244                             ldlm_lock_busy(lock)) {
245                                 LDLM_DEBUG(lock, "prolong the busy lock");
246                                 lock_res_and_lock(lock);
247                                 ldlm_add_waiting_lock(lock,
248                                                 ldlm_bl_timeout(lock) >> 1);
249                                 unlock_res_and_lock(lock);
250                         } else {
251                                 spin_lock_bh(&export->exp_bl_list_lock);
252                                 list_del_init(&lock->l_exp_list);
253                                 spin_unlock_bh(&export->exp_bl_list_lock);
254
255                                 LDLM_ERROR(lock,
256                                            "lock callback timer expired after %llds: evicting client at %s ",
257                                            ktime_get_seconds() -
258                                            lock->l_blast_sent,
259                                            obd_export_nid2str(export));
260                                 ldlm_lock_to_ns(lock)->ns_timeouts++;
261                                 if (do_dump_on_eviction(export->exp_obd))
262                                         do_dump++;
263                                 class_fail_export(export);
264                         }
265                         class_export_lock_put(export, lock);
266                         /*
267                          * release extra ref grabbed by ldlm_add_waiting_lock()
268                          * or ldlm_failed_ast()
269                          */
270                         LDLM_LOCK_RELEASE(lock);
271
272                         spin_lock_bh(&waiting_locks_spinlock);
273                 }
274                 spin_unlock_bh(&waiting_locks_spinlock);
275
276                 if (do_dump) {
277                         CERROR("dump the log upon eviction\n");
278                         libcfs_debug_dumplog();
279                 }
280
281                 if (expired_lock_thread_state == ELT_TERMINATE)
282                         break;
283         }
284
285         expired_lock_thread_state = ELT_STOPPED;
286         wake_up(&expired_lock_wait_queue);
287         RETURN(0);
288 }
289
290 /**
291  * Check if there is a request in the export request list
292  * which prevents the lock canceling.
293  */
294 static int ldlm_lock_busy(struct ldlm_lock *lock)
295 {
296         struct ptlrpc_request *req;
297         int match = 0;
298
299         ENTRY;
300
301         if (lock->l_export == NULL)
302                 return 0;
303
304         spin_lock(&lock->l_export->exp_rpc_lock);
305         list_for_each_entry(req, &lock->l_export->exp_hp_rpcs,
306                                 rq_exp_list) {
307                 if (req->rq_ops->hpreq_lock_match) {
308                         match = req->rq_ops->hpreq_lock_match(req, lock);
309                         if (match)
310                                 break;
311                 }
312         }
313         spin_unlock(&lock->l_export->exp_rpc_lock);
314         RETURN(match);
315 }
316
317 /* This is called from within a timer interrupt and cannot schedule */
318 static void waiting_locks_callback(TIMER_DATA_TYPE unused)
319 {
320         struct ldlm_lock *lock;
321         int need_dump = 0;
322
323         spin_lock_bh(&waiting_locks_spinlock);
324         while (!list_empty(&waiting_locks_list)) {
325                 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
326                                   l_pending_chain);
327                 if (lock->l_callback_timestamp > ktime_get_seconds() ||
328                     lock->l_req_mode == LCK_GROUP)
329                         break;
330
331                 /*
332                  * no needs to take an extra ref on the lock since it was in
333                  * the waiting_locks_list and ldlm_add_waiting_lock()
334                  * already grabbed a ref
335                  */
336                 list_move(&lock->l_pending_chain, &expired_lock_list);
337                 need_dump = 1;
338         }
339
340         if (!list_empty(&expired_lock_list)) {
341                 if (obd_dump_on_timeout && need_dump)
342                         expired_lock_dump = __LINE__;
343
344                 wake_up(&expired_lock_wait_queue);
345         }
346
347         /*
348          * Make sure the timer will fire again if we have any locks
349          * left.
350          */
351         if (!list_empty(&waiting_locks_list)) {
352                 time64_t now = ktime_get_seconds();
353                 timeout_t delta = 0;
354
355                 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
356                                   l_pending_chain);
357                 if (lock->l_callback_timestamp - now > 0)
358                         delta = lock->l_callback_timestamp - now;
359                 mod_timer(&waiting_locks_timer,
360                           jiffies + cfs_time_seconds(delta));
361         }
362         spin_unlock_bh(&waiting_locks_spinlock);
363 }
364
365 /**
366  * Add lock to the list of contended locks.
367  *
368  * Indicate that we're waiting for a client to call us back cancelling a given
369  * lock.  We add it to the pending-callback chain, and schedule the lock-timeout
370  * timer to fire appropriately.  (We round up to the next second, to avoid
371  * floods of timer firings during periods of high lock contention and traffic).
372  * As done by ldlm_add_waiting_lock(), the caller must grab a lock reference
373  * if it has been added to the waiting list (1 is returned).
374  *
375  * Called with the namespace lock held.
376  */
377 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, timeout_t delay)
378 {
379         unsigned long timeout_jiffies = jiffies;
380         time64_t deadline;
381         timeout_t timeout;
382
383         lock->l_blast_sent = ktime_get_seconds();
384         if (!list_empty(&lock->l_pending_chain))
385                 return 0;
386
387         if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT) ||
388             OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
389                 delay = 1;
390
391         deadline = lock->l_blast_sent + delay;
392         if (likely(deadline > lock->l_callback_timestamp))
393                 lock->l_callback_timestamp = deadline;
394
395         timeout = clamp_t(timeout_t,
396                           lock->l_callback_timestamp - lock->l_blast_sent,
397                           0, delay);
398         timeout_jiffies += cfs_time_seconds(timeout);
399
400         if (time_before(timeout_jiffies, waiting_locks_timer.expires) ||
401             !timer_pending(&waiting_locks_timer))
402                 mod_timer(&waiting_locks_timer, timeout_jiffies);
403
404         /*
405          * if the new lock has a shorter timeout than something earlier on
406          * the list, we'll wait the longer amount of time; no big deal.
407          */
408         /* FIFO */
409         list_add_tail(&lock->l_pending_chain, &waiting_locks_list);
410         return 1;
411 }
412
413 static void ldlm_add_blocked_lock(struct ldlm_lock *lock)
414 {
415         spin_lock_bh(&lock->l_export->exp_bl_list_lock);
416         if (list_empty(&lock->l_exp_list)) {
417                 if (!ldlm_is_granted(lock))
418                         list_add_tail(&lock->l_exp_list,
419                                       &lock->l_export->exp_bl_list);
420                 else
421                         list_add(&lock->l_exp_list,
422                                  &lock->l_export->exp_bl_list);
423         }
424         spin_unlock_bh(&lock->l_export->exp_bl_list_lock);
425
426         /*
427          * A blocked lock is added. Adjust the position in
428          * the stale list if the export is in the list.
429          * If export is stale and not in the list - it is being
430          * processed and will be placed on the right position
431          * on obd_stale_export_put().
432          */
433         if (!list_empty(&lock->l_export->exp_stale_list))
434                 obd_stale_export_adjust(lock->l_export);
435 }
436
437 static int ldlm_add_waiting_lock(struct ldlm_lock *lock, timeout_t timeout)
438 {
439         int ret;
440
441         /* NB: must be called with hold of lock_res_and_lock() */
442         LASSERT(ldlm_is_res_locked(lock));
443         LASSERT(!ldlm_is_cancel_on_block(lock));
444
445         /*
446          * Do not put cross-MDT lock in the waiting list, since we
447          * will not evict it due to timeout for now
448          */
449         if (lock->l_export != NULL &&
450             (exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS))
451                 return 0;
452
453         spin_lock_bh(&waiting_locks_spinlock);
454         if (ldlm_is_cancel(lock)) {
455                 spin_unlock_bh(&waiting_locks_spinlock);
456                 return 0;
457         }
458
459         if (ldlm_is_destroyed(lock)) {
460                 static time64_t next;
461
462                 spin_unlock_bh(&waiting_locks_spinlock);
463                 LDLM_ERROR(lock, "not waiting on destroyed lock (b=5653)");
464                 if (ktime_get_seconds() > next) {
465                         next = ktime_get_seconds() + 14400;
466                         libcfs_debug_dumpstack(NULL);
467                 }
468                 return 0;
469         }
470
471         ldlm_set_waited(lock);
472         ret = __ldlm_add_waiting_lock(lock, timeout);
473         if (ret) {
474                 /*
475                  * grab ref on the lock if it has been added to the
476                  * waiting list
477                  */
478                 LDLM_LOCK_GET(lock);
479         }
480         spin_unlock_bh(&waiting_locks_spinlock);
481
482         if (ret)
483                 ldlm_add_blocked_lock(lock);
484
485         LDLM_DEBUG(lock, "%sadding to wait list(timeout: %d, AT: %s)",
486                    ret == 0 ? "not re-" : "", timeout,
487                    AT_OFF ? "off" : "on");
488         return ret;
489 }
490
491 /**
492  * Remove a lock from the pending list, likely because it had its cancellation
493  * callback arrive without incident.  This adjusts the lock-timeout timer if
494  * needed.  Returns 0 if the lock wasn't pending after all, 1 if it was.
495  * As done by ldlm_del_waiting_lock(), the caller must release the lock
496  * reference when the lock is removed from any list (1 is returned).
497  *
498  * Called with namespace lock held.
499  */
500 static int __ldlm_del_waiting_lock(struct ldlm_lock *lock)
501 {
502         struct list_head *list_next;
503
504         if (list_empty(&lock->l_pending_chain))
505                 return 0;
506
507         list_next = lock->l_pending_chain.next;
508         if (lock->l_pending_chain.prev == &waiting_locks_list) {
509                 /* Removing the head of the list, adjust timer. */
510                 if (list_next == &waiting_locks_list) {
511                         /* No more, just cancel. */
512                         del_timer(&waiting_locks_timer);
513                 } else {
514                         time64_t now = ktime_get_seconds();
515                         struct ldlm_lock *next;
516                         timeout_t delta = 0;
517
518                         next = list_entry(list_next, struct ldlm_lock,
519                                           l_pending_chain);
520                         if (next->l_callback_timestamp - now > 0)
521                                 delta = lock->l_callback_timestamp - now;
522
523                         mod_timer(&waiting_locks_timer,
524                                   jiffies + cfs_time_seconds(delta));
525                 }
526         }
527         list_del_init(&lock->l_pending_chain);
528
529         return 1;
530 }
531
532 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
533 {
534         int ret;
535
536         if (lock->l_export == NULL) {
537                 /* We don't have a "waiting locks list" on clients. */
538                 CDEBUG(D_DLMTRACE, "Client lock %p : no-op\n", lock);
539                 return 0;
540         }
541
542         spin_lock_bh(&waiting_locks_spinlock);
543         ret = __ldlm_del_waiting_lock(lock);
544         ldlm_clear_waited(lock);
545         spin_unlock_bh(&waiting_locks_spinlock);
546
547         /* remove the lock out of export blocking list */
548         spin_lock_bh(&lock->l_export->exp_bl_list_lock);
549         list_del_init(&lock->l_exp_list);
550         spin_unlock_bh(&lock->l_export->exp_bl_list_lock);
551
552         if (ret) {
553                 /*
554                  * release lock ref if it has indeed been removed
555                  * from a list
556                  */
557                 LDLM_LOCK_RELEASE(lock);
558         }
559
560         LDLM_DEBUG(lock, "%s", ret == 0 ? "wasn't waiting" : "removed");
561         return ret;
562 }
563
564 /**
565  * Prolong the contended lock waiting time.
566  *
567  * Called with namespace lock held.
568  */
569 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, timeout_t timeout)
570 {
571         if (lock->l_export == NULL) {
572                 /* We don't have a "waiting locks list" on clients. */
573                 LDLM_DEBUG(lock, "client lock: no-op");
574                 return 0;
575         }
576
577         if (exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS) {
578                 /* We don't have a "waiting locks list" on OSP. */
579                 LDLM_DEBUG(lock, "MDS-MDS lock: no-op");
580                 return 0;
581         }
582
583         spin_lock_bh(&waiting_locks_spinlock);
584
585         if (list_empty(&lock->l_pending_chain)) {
586                 spin_unlock_bh(&waiting_locks_spinlock);
587                 LDLM_DEBUG(lock, "wasn't waiting");
588                 return 0;
589         }
590
591         /*
592          * we remove/add the lock to the waiting list, so no needs to
593          * release/take a lock reference
594          */
595         __ldlm_del_waiting_lock(lock);
596         __ldlm_add_waiting_lock(lock, timeout);
597         spin_unlock_bh(&waiting_locks_spinlock);
598
599         LDLM_DEBUG(lock, "refreshed to %ds", timeout);
600         return 1;
601 }
602 EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
603
604 #else /* HAVE_SERVER_SUPPORT */
605
606 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
607 {
608         RETURN(0);
609 }
610
611 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, timeout_t timeout)
612 {
613         RETURN(0);
614 }
615
616 #endif /* !HAVE_SERVER_SUPPORT */
617
618 #ifdef HAVE_SERVER_SUPPORT
619
620 /**
621  * Calculate the per-export Blocking timeout (covering BL AST, data flush,
622  * lock cancel, and their replies). Used for lock callback timeout and AST
623  * re-send period.
624  *
625  * \param[in] lock        lock which is getting the blocking callback
626  *
627  * \retval            timeout in seconds to wait for the client reply
628  */
629 timeout_t ldlm_bl_timeout(struct ldlm_lock *lock)
630 {
631         timeout_t timeout;
632
633         if (AT_OFF)
634                 return obd_timeout / 2;
635
636         /*
637          * Since these are non-updating timeouts, we should be conservative.
638          * Take more than usually, 150%
639          * It would be nice to have some kind of "early reply" mechanism for
640          * lock callbacks too...
641          */
642         timeout = at_get(&lock->l_export->exp_bl_lock_at);
643         return max_t(timeout_t, timeout + (timeout >> 1),
644                      (timeout_t)ldlm_enqueue_min);
645 }
646 EXPORT_SYMBOL(ldlm_bl_timeout);
647
648 /**
649  * Perform lock cleanup if AST sending failed.
650  */
651 static void ldlm_failed_ast(struct ldlm_lock *lock, int rc,
652                             const char *ast_type)
653 {
654         LCONSOLE_ERROR_MSG(0x138,
655                            "%s: A client on nid %s was evicted due to a lock %s callback time out: rc %d\n",
656                            lock->l_export->exp_obd->obd_name,
657                            obd_export_nid2str(lock->l_export), ast_type, rc);
658
659         if (obd_dump_on_timeout)
660                 libcfs_debug_dumplog();
661         spin_lock_bh(&waiting_locks_spinlock);
662         if (__ldlm_del_waiting_lock(lock) == 0)
663                 /*
664                  * the lock was not in any list, grab an extra ref before adding
665                  * the lock to the expired list
666                  */
667                 LDLM_LOCK_GET(lock);
668         /* differentiate it from expired locks */
669         lock->l_callback_timestamp = 0;
670         list_add(&lock->l_pending_chain, &expired_lock_list);
671         wake_up(&expired_lock_wait_queue);
672         spin_unlock_bh(&waiting_locks_spinlock);
673 }
674
675 /**
676  * Perform lock cleanup if AST reply came with error.
677  */
678 static int ldlm_handle_ast_error(struct ldlm_lock *lock,
679                                  struct ptlrpc_request *req, int rc,
680                                  const char *ast_type)
681 {
682         struct lnet_process_id peer = req->rq_import->imp_connection->c_peer;
683
684         if (!req->rq_replied || (rc && rc != -EINVAL)) {
685                 if (ldlm_is_cancel(lock)) {
686                         LDLM_DEBUG(lock,
687                                    "%s AST (req@%p x%llu) timeout from nid %s, but cancel was received (AST reply lost?)",
688                                    ast_type, req, req->rq_xid,
689                                    libcfs_nid2str(peer.nid));
690                         ldlm_lock_cancel(lock);
691                         rc = -ERESTART;
692                 } else if (rc == -ENODEV || rc == -ESHUTDOWN ||
693                            (rc == -EIO &&
694                             req->rq_import->imp_state == LUSTRE_IMP_CLOSED)) {
695                         /*
696                          * Upon umount process the AST fails because cannot be
697                          * sent. This shouldn't lead to the client eviction.
698                          * -ENODEV error is returned by ptl_send_rpc() for
699                          *  new request in such import.
700                          * -SHUTDOWN is returned by ptlrpc_import_delay_req()
701                          *  if imp_invalid is set or obd_no_recov.
702                          * Meanwhile there is also check for LUSTRE_IMP_CLOSED
703                          * in ptlrpc_import_delay_req() as well with -EIO code.
704                          * In all such cases errors are ignored.
705                          */
706                         LDLM_DEBUG(lock,
707                                    "%s AST can't be sent due to a server %s failure or umount process: rc = %d\n",
708                                     ast_type,
709                                      req->rq_import->imp_obd->obd_name, rc);
710                 } else {
711                         LDLM_ERROR(lock,
712                                    "client (nid %s) %s %s AST (req@%p x%llu status %d rc %d), evict it",
713                                    libcfs_nid2str(peer.nid),
714                                    req->rq_replied ? "returned error from" :
715                                    "failed to reply to",
716                                    ast_type, req, req->rq_xid,
717                                    (req->rq_repmsg != NULL) ?
718                                    lustre_msg_get_status(req->rq_repmsg) : 0,
719                                    rc);
720                         ldlm_failed_ast(lock, rc, ast_type);
721                 }
722                 return rc;
723         }
724
725         if (rc == -EINVAL) {
726                 struct ldlm_resource *res = lock->l_resource;
727
728                 LDLM_DEBUG(lock,
729                            "client (nid %s) returned %d from %s AST (req@%p x%llu) - normal race",
730                            libcfs_nid2str(peer.nid),
731                            req->rq_repmsg ?
732                            lustre_msg_get_status(req->rq_repmsg) : -1,
733                            ast_type, req, req->rq_xid);
734                 if (res) {
735                         /*
736                          * update lvbo to return proper attributes.
737                          * see b=23174
738                          */
739                         ldlm_resource_getref(res);
740                         ldlm_lvbo_update(res, lock, NULL, 1);
741                         ldlm_resource_putref(res);
742                 }
743                 ldlm_lock_cancel(lock);
744                 rc = -ERESTART;
745         }
746
747         return rc;
748 }
749
750 static int ldlm_cb_interpret(const struct lu_env *env,
751                              struct ptlrpc_request *req, void *args, int rc)
752 {
753         struct ldlm_cb_async_args *ca = args;
754         struct ldlm_lock *lock = ca->ca_lock;
755         struct ldlm_cb_set_arg *arg  = ca->ca_set_arg;
756
757         ENTRY;
758
759         LASSERT(lock != NULL);
760
761         switch (arg->type) {
762         case LDLM_GL_CALLBACK:
763                 /*
764                  * Update the LVB from disk if the AST failed
765                  * (this is a legal race)
766                  *
767                  * - Glimpse callback of local lock just returns
768                  *   -ELDLM_NO_LOCK_DATA.
769                  * - Glimpse callback of remote lock might return
770                  *   -ELDLM_NO_LOCK_DATA when inode is cleared. LU-274
771                  */
772                 if (unlikely(arg->gl_interpret_reply)) {
773                         rc = arg->gl_interpret_reply(NULL, req, args, rc);
774                 } else if (rc == -ELDLM_NO_LOCK_DATA) {
775                         LDLM_DEBUG(lock,
776                                    "lost race - client has a lock but no inode");
777                         ldlm_lvbo_update(lock->l_resource, lock, NULL, 1);
778                 } else if (rc != 0) {
779                         rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
780                 } else {
781                         rc = ldlm_lvbo_update(lock->l_resource,
782                                               lock, req, 1);
783                 }
784                 break;
785         case LDLM_BL_CALLBACK:
786                 if (rc != 0)
787                         rc = ldlm_handle_ast_error(lock, req, rc, "blocking");
788                 break;
789         case LDLM_CP_CALLBACK:
790                 if (rc != 0)
791                         rc = ldlm_handle_ast_error(lock, req, rc, "completion");
792                 break;
793         default:
794                 LDLM_ERROR(lock, "invalid opcode for lock callback %d",
795                            arg->type);
796                 LBUG();
797         }
798
799         /* release extra reference taken in ldlm_ast_fini() */
800         LDLM_LOCK_RELEASE(lock);
801
802         if (rc == -ERESTART)
803                 atomic_inc(&arg->restart);
804
805         RETURN(0);
806 }
807
808 static void ldlm_update_resend(struct ptlrpc_request *req, void *data)
809 {
810         struct ldlm_cb_async_args *ca = data;
811         struct ldlm_lock *lock = ca->ca_lock;
812
813         ldlm_refresh_waiting_lock(lock, ldlm_bl_timeout(lock));
814 }
815
816 static inline int ldlm_ast_fini(struct ptlrpc_request *req,
817                                 struct ldlm_cb_set_arg *arg,
818                                 struct ldlm_lock *lock,
819                                 int instant_cancel)
820 {
821         int rc = 0;
822
823         ENTRY;
824
825         if (unlikely(instant_cancel)) {
826                 rc = ptl_send_rpc(req, 1);
827                 ptlrpc_req_finished(req);
828                 if (rc == 0)
829                         atomic_inc(&arg->restart);
830         } else {
831                 LDLM_LOCK_GET(lock);
832                 ptlrpc_set_add_req(arg->set, req);
833         }
834
835         RETURN(rc);
836 }
837
838 /**
839  * Check if there are requests in the export request list which prevent
840  * the lock canceling and make these requests high priority ones.
841  */
842 static void ldlm_lock_reorder_req(struct ldlm_lock *lock)
843 {
844         struct ptlrpc_request *req;
845
846         ENTRY;
847
848         if (lock->l_export == NULL) {
849                 LDLM_DEBUG(lock, "client lock: no-op");
850                 RETURN_EXIT;
851         }
852
853         spin_lock(&lock->l_export->exp_rpc_lock);
854         list_for_each_entry(req, &lock->l_export->exp_hp_rpcs,
855                             rq_exp_list) {
856                 /*
857                  * Do not process requests that were not yet added to there
858                  * incoming queue or were already removed from there for
859                  * processing. We evaluate ptlrpc_nrs_req_can_move() without
860                  * holding svcpt->scp_req_lock, and then redo the check with
861                  * the lock held once we need to obtain a reliable result.
862                  */
863                 if (ptlrpc_nrs_req_can_move(req) &&
864                     req->rq_ops->hpreq_lock_match &&
865                     req->rq_ops->hpreq_lock_match(req, lock))
866                         ptlrpc_nrs_req_hp_move(req);
867         }
868         spin_unlock(&lock->l_export->exp_rpc_lock);
869         EXIT;
870 }
871
872 /**
873  * ->l_blocking_ast() method for server-side locks. This is invoked when newly
874  * enqueued server lock conflicts with given one.
875  *
876  * Sends blocking AST RPC to the client owning that lock; arms timeout timer
877  * to wait for client response.
878  */
879 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
880                              struct ldlm_lock_desc *desc,
881                              void *data, int flag)
882 {
883         struct ldlm_cb_async_args *ca;
884         struct ldlm_cb_set_arg *arg = data;
885         struct ldlm_request *body;
886         struct ptlrpc_request  *req;
887         int instant_cancel = 0;
888         int rc = 0;
889
890         ENTRY;
891
892         if (flag == LDLM_CB_CANCELING)
893                 /* Don't need to do anything here. */
894                 RETURN(0);
895
896         if (OBD_FAIL_PRECHECK(OBD_FAIL_LDLM_SRV_BL_AST)) {
897                 LDLM_DEBUG(lock, "dropping BL AST");
898                 RETURN(0);
899         }
900
901         LASSERT(lock);
902         LASSERT(data != NULL);
903         if (lock->l_export->exp_obd->obd_recovering != 0)
904                 LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
905
906         ldlm_lock_reorder_req(lock);
907
908         req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
909                                         &RQF_LDLM_BL_CALLBACK,
910                                         LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK);
911         if (req == NULL)
912                 RETURN(-ENOMEM);
913
914         ca = ptlrpc_req_async_args(ca, req);
915         ca->ca_set_arg = arg;
916         ca->ca_lock = lock;
917
918         req->rq_interpret_reply = ldlm_cb_interpret;
919
920         lock_res_and_lock(lock);
921         if (ldlm_is_destroyed(lock)) {
922                 /* What's the point? */
923                 unlock_res_and_lock(lock);
924                 ptlrpc_req_finished(req);
925                 RETURN(0);
926         }
927
928         if (!ldlm_is_granted(lock)) {
929                 /*
930                  * this blocking AST will be communicated as part of the
931                  * completion AST instead
932                  */
933                 ldlm_add_blocked_lock(lock);
934                 ldlm_set_waited(lock);
935                 unlock_res_and_lock(lock);
936
937                 ptlrpc_req_finished(req);
938                 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
939                 RETURN(0);
940         }
941
942         if (ldlm_is_cancel_on_block(lock))
943                 instant_cancel = 1;
944
945         body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
946         body->lock_handle[0] = lock->l_remote_handle;
947         body->lock_handle[1].cookie = lock->l_handle.h_cookie;
948         body->lock_desc = *desc;
949         body->lock_flags |= ldlm_flags_to_wire(lock->l_flags & LDLM_FL_AST_MASK);
950
951         LDLM_DEBUG(lock, "server preparing blocking AST");
952
953         ptlrpc_request_set_replen(req);
954         ldlm_set_cbpending(lock);
955         if (instant_cancel) {
956                 unlock_res_and_lock(lock);
957                 ldlm_lock_cancel(lock);
958
959                 req->rq_no_resend = 1;
960         } else {
961                 LASSERT(ldlm_is_granted(lock));
962                 ldlm_add_waiting_lock(lock, ldlm_bl_timeout(lock));
963                 unlock_res_and_lock(lock);
964
965                 /* Do not resend after lock callback timeout */
966                 req->rq_delay_limit = ldlm_bl_timeout(lock);
967                 req->rq_resend_cb = ldlm_update_resend;
968         }
969
970         req->rq_send_state = LUSTRE_IMP_FULL;
971         /* ptlrpc_request_alloc_pack already set timeout */
972         if (AT_OFF)
973                 req->rq_timeout = ldlm_get_rq_timeout();
974
975         if (lock->l_export && lock->l_export->exp_nid_stats &&
976             lock->l_export->exp_nid_stats->nid_ldlm_stats)
977                 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
978                                      LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
979
980         rc = ldlm_ast_fini(req, arg, lock, instant_cancel);
981
982         RETURN(rc);
983 }
984
985 /**
986  * ->l_completion_ast callback for a remote lock in server namespace.
987  *
988  *  Sends AST to the client notifying it of lock granting.  If initial
989  *  lock response was not sent yet, instead of sending another RPC, just
990  *  mark the lock as granted and client will understand
991  */
992 int ldlm_server_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data)
993 {
994         struct ldlm_cb_set_arg *arg = data;
995         struct ldlm_request *body;
996         struct ptlrpc_request *req;
997         struct ldlm_cb_async_args *ca;
998         int instant_cancel = 0;
999         int rc = 0;
1000         int lvb_len;
1001
1002         ENTRY;
1003
1004         LASSERT(lock != NULL);
1005         LASSERT(data != NULL);
1006
1007         if (OBD_FAIL_PRECHECK(OBD_FAIL_LDLM_SRV_CP_AST)) {
1008                 LDLM_DEBUG(lock, "dropping CP AST");
1009                 RETURN(0);
1010         }
1011
1012         req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse,
1013                                    &RQF_LDLM_CP_CALLBACK);
1014         if (req == NULL)
1015                 RETURN(-ENOMEM);
1016
1017         /* server namespace, doesn't need lock */
1018         lvb_len = ldlm_lvbo_size(lock);
1019         /*
1020          * LU-3124 & LU-2187: to not return layout in completion AST because
1021          * it may deadlock for LU-2187, or client may not have enough space
1022          * for large layout. The layout will be returned to client with an
1023          * extra RPC to fetch xattr.lov
1024          */
1025         if (ldlm_has_layout(lock))
1026                 lvb_len = 0;
1027
1028         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT, lvb_len);
1029         rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK);
1030         if (rc) {
1031                 ptlrpc_request_free(req);
1032                 RETURN(rc);
1033         }
1034
1035         ca = ptlrpc_req_async_args(ca, req);
1036         ca->ca_set_arg = arg;
1037         ca->ca_lock = lock;
1038
1039         req->rq_interpret_reply = ldlm_cb_interpret;
1040         body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1041
1042         body->lock_handle[0] = lock->l_remote_handle;
1043         body->lock_handle[1].cookie = lock->l_handle.h_cookie;
1044         body->lock_flags = ldlm_flags_to_wire(flags);
1045         ldlm_lock2desc(lock, &body->lock_desc);
1046         if (lvb_len > 0) {
1047                 void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB);
1048                 lvb_len = ldlm_lvbo_fill(lock, lvb, &lvb_len);
1049                 if (lvb_len < 0) {
1050                         /*
1051                          * We still need to send the RPC to wake up the blocked
1052                          * enqueue thread on the client.
1053                          *
1054                          * Consider old client, there is no better way to notify
1055                          * the failure, just zero-sized the LVB, then the client
1056                          * will fail out as "-EPROTO".
1057                          */
1058                         req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, 0,
1059                                            RCL_CLIENT);
1060                         instant_cancel = 1;
1061                 } else {
1062                         req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, lvb_len,
1063                                            RCL_CLIENT);
1064                 }
1065         }
1066
1067         LDLM_DEBUG(lock, "server preparing completion AST");
1068
1069         ptlrpc_request_set_replen(req);
1070
1071         req->rq_send_state = LUSTRE_IMP_FULL;
1072         /* ptlrpc_request_pack already set timeout */
1073         if (AT_OFF)
1074                 req->rq_timeout = ldlm_get_rq_timeout();
1075
1076         /* We only send real blocking ASTs after the lock is granted */
1077         lock_res_and_lock(lock);
1078         if (ldlm_is_ast_sent(lock)) {
1079                 body->lock_flags |= ldlm_flags_to_wire(LDLM_FL_AST_SENT);
1080                 /* Copy AST flags like LDLM_FL_DISCARD_DATA. */
1081                 body->lock_flags |= ldlm_flags_to_wire(lock->l_flags &
1082                                                        LDLM_FL_AST_MASK);
1083
1084                 /*
1085                  * We might get here prior to ldlm_handle_enqueue setting
1086                  * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
1087                  * into waiting list, but this is safe and similar code in
1088                  * ldlm_handle_enqueue will call ldlm_lock_cancel() still,
1089                  * that would not only cancel the lock, but will also remove
1090                  * it from waiting list
1091                  */
1092                 if (ldlm_is_cancel_on_block(lock)) {
1093                         unlock_res_and_lock(lock);
1094                         ldlm_lock_cancel(lock);
1095
1096                         instant_cancel = 1;
1097                         req->rq_no_resend = 1;
1098
1099                         lock_res_and_lock(lock);
1100                 } else {
1101                         /* start the lock-timeout clock */
1102                         ldlm_add_waiting_lock(lock, ldlm_bl_timeout(lock));
1103                         /* Do not resend after lock callback timeout */
1104                         req->rq_delay_limit = ldlm_bl_timeout(lock);
1105                         req->rq_resend_cb = ldlm_update_resend;
1106                 }
1107         }
1108         unlock_res_and_lock(lock);
1109
1110         if (lock->l_export && lock->l_export->exp_nid_stats &&
1111             lock->l_export->exp_nid_stats->nid_ldlm_stats)
1112                 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
1113                                      LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
1114
1115         rc = ldlm_ast_fini(req, arg, lock, instant_cancel);
1116
1117         RETURN(lvb_len < 0 ? lvb_len : rc);
1118 }
1119
1120 /**
1121  * Server side ->l_glimpse_ast handler for client locks.
1122  *
1123  * Sends glimpse AST to the client and waits for reply. Then updates
1124  * lvbo with the result.
1125  */
1126 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
1127 {
1128         struct ldlm_cb_set_arg *arg = data;
1129         struct ldlm_request *body;
1130         struct ptlrpc_request *req;
1131         struct ldlm_cb_async_args *ca;
1132         int rc;
1133         struct req_format *req_fmt;
1134
1135         ENTRY;
1136
1137         LASSERT(lock != NULL);
1138
1139         if (arg->gl_desc != NULL)
1140                 /* There is a glimpse descriptor to pack */
1141                 req_fmt = &RQF_LDLM_GL_CALLBACK_DESC;
1142         else
1143                 req_fmt = &RQF_LDLM_GL_CALLBACK;
1144
1145         req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
1146                                         req_fmt, LUSTRE_DLM_VERSION,
1147                                         LDLM_GL_CALLBACK);
1148
1149         if (req == NULL)
1150                 RETURN(-ENOMEM);
1151
1152         if (arg->gl_desc != NULL) {
1153                 /* copy the GL descriptor */
1154                 union ldlm_gl_desc      *desc;
1155
1156                 desc = req_capsule_client_get(&req->rq_pill, &RMF_DLM_GL_DESC);
1157                 *desc = *arg->gl_desc;
1158         }
1159
1160         body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1161         body->lock_handle[0] = lock->l_remote_handle;
1162         ldlm_lock2desc(lock, &body->lock_desc);
1163
1164         ca = ptlrpc_req_async_args(ca, req);
1165         ca->ca_set_arg = arg;
1166         ca->ca_lock = lock;
1167
1168         /* server namespace, doesn't need lock */
1169         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
1170                              ldlm_lvbo_size(lock));
1171         ptlrpc_request_set_replen(req);
1172
1173         req->rq_send_state = LUSTRE_IMP_FULL;
1174         /* ptlrpc_request_alloc_pack already set timeout */
1175         if (AT_OFF)
1176                 req->rq_timeout = ldlm_get_rq_timeout();
1177
1178         req->rq_interpret_reply = ldlm_cb_interpret;
1179
1180         if (lock->l_export && lock->l_export->exp_nid_stats) {
1181                 struct nid_stat *nid_stats = lock->l_export->exp_nid_stats;
1182
1183                 lprocfs_counter_incr(nid_stats->nid_ldlm_stats,
1184                                      LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
1185         }
1186
1187         rc = ldlm_ast_fini(req, arg, lock, 0);
1188
1189         RETURN(rc);
1190 }
1191 EXPORT_SYMBOL(ldlm_server_glimpse_ast);
1192
1193 int ldlm_glimpse_locks(struct ldlm_resource *res,
1194                        struct list_head *gl_work_list)
1195 {
1196         int rc;
1197
1198         ENTRY;
1199
1200         rc = ldlm_run_ast_work(ldlm_res_to_ns(res), gl_work_list,
1201                                LDLM_WORK_GL_AST);
1202         if (rc == -ERESTART)
1203                 ldlm_reprocess_all(res, 0);
1204
1205         RETURN(rc);
1206 }
1207 EXPORT_SYMBOL(ldlm_glimpse_locks);
1208
1209 /* return LDLM lock associated with a lock callback request */
1210 struct ldlm_lock *ldlm_request_lock(struct ptlrpc_request *req)
1211 {
1212         struct ldlm_cb_async_args *ca;
1213         struct ldlm_lock *lock;
1214
1215         ENTRY;
1216
1217         ca = ptlrpc_req_async_args(ca, req);
1218         lock = ca->ca_lock;
1219         if (lock == NULL)
1220                 RETURN(ERR_PTR(-EFAULT));
1221
1222         RETURN(lock);
1223 }
1224 EXPORT_SYMBOL(ldlm_request_lock);
1225
1226 /**
1227  * Main server-side entry point into LDLM for enqueue. This is called by ptlrpc
1228  * service threads to carry out client lock enqueueing requests.
1229  */
1230 int ldlm_handle_enqueue0(struct ldlm_namespace *ns,
1231                          struct ptlrpc_request *req,
1232                          const struct ldlm_request *dlm_req,
1233                          const struct ldlm_callback_suite *cbs)
1234 {
1235         struct ldlm_reply *dlm_rep;
1236         __u64 flags;
1237         enum ldlm_error err = ELDLM_OK;
1238         struct ldlm_lock *lock = NULL;
1239         void *cookie = NULL;
1240         int rc = 0;
1241         struct ldlm_resource *res = NULL;
1242         const struct lu_env *env = req->rq_svc_thread->t_env;
1243
1244         ENTRY;
1245
1246         LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
1247
1248         ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF, LATF_SKIP);
1249         flags = ldlm_flags_from_wire(dlm_req->lock_flags);
1250
1251         LASSERT(req->rq_export);
1252
1253         /* for intent enqueue the stat will be updated inside intent policy */
1254         if (ptlrpc_req2svc(req)->srv_stats != NULL &&
1255             !(dlm_req->lock_flags & LDLM_FL_HAS_INTENT))
1256                 ldlm_svc_get_eopc(dlm_req, ptlrpc_req2svc(req)->srv_stats);
1257
1258         if (req->rq_export && req->rq_export->exp_nid_stats &&
1259             req->rq_export->exp_nid_stats->nid_ldlm_stats)
1260                 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1261                                      LDLM_ENQUEUE - LDLM_FIRST_OPC);
1262
1263         if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE ||
1264                      dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) {
1265                 DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
1266                           dlm_req->lock_desc.l_resource.lr_type);
1267                 GOTO(out, rc = -EFAULT);
1268         }
1269
1270         if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE ||
1271                      dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE ||
1272                      dlm_req->lock_desc.l_req_mode &
1273                      (dlm_req->lock_desc.l_req_mode-1))) {
1274                 DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
1275                           dlm_req->lock_desc.l_req_mode);
1276                 GOTO(out, rc = -EFAULT);
1277         }
1278
1279         if (unlikely((flags & LDLM_FL_REPLAY) ||
1280                      (lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))) {
1281                 /* Find an existing lock in the per-export lock hash */
1282                 /*
1283                  * In the function below, .hs_keycmp resolves to
1284                  * ldlm_export_lock_keycmp()
1285                  */
1286                 /* coverity[overrun-buffer-val] */
1287                 lock = cfs_hash_lookup(req->rq_export->exp_lock_hash,
1288                                        (void *)&dlm_req->lock_handle[0]);
1289                 if (lock != NULL) {
1290                         DEBUG_REQ(D_DLMTRACE, req,
1291                                   "found existing lock cookie %#llx",
1292                                   lock->l_handle.h_cookie);
1293                         flags |= LDLM_FL_RESENT;
1294                         GOTO(existing_lock, rc = 0);
1295                 }
1296         } else {
1297                 if (ldlm_reclaim_full()) {
1298                         DEBUG_REQ(D_DLMTRACE, req,
1299                                   "Too many granted locks, reject current enqueue request and let the client retry later");
1300                         GOTO(out, rc = -EINPROGRESS);
1301                 }
1302         }
1303
1304         /* The lock's callback data might be set in the policy function */
1305         lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
1306                                 dlm_req->lock_desc.l_resource.lr_type,
1307                                 dlm_req->lock_desc.l_req_mode,
1308                                 cbs, NULL, 0, LVB_T_NONE);
1309         if (IS_ERR(lock)) {
1310                 rc = PTR_ERR(lock);
1311                 lock = NULL;
1312                 GOTO(out, rc);
1313         }
1314
1315         lock->l_remote_handle = dlm_req->lock_handle[0];
1316         LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
1317
1318         /*
1319          * Initialize resource lvb but not for a lock being replayed since
1320          * Client already got lvb sent in this case.
1321          * This must occur early since some policy methods assume resource
1322          * lvb is available (lr_lvb_data != NULL).
1323          */
1324         res = lock->l_resource;
1325         if (!(flags & LDLM_FL_REPLAY)) {
1326                 /* non-replayed lock, delayed lvb init may need to be done */
1327                 rc = ldlm_lvbo_init(res);
1328                 if (rc < 0) {
1329                         LDLM_DEBUG(lock, "delayed lvb init failed (rc %d)", rc);
1330                         GOTO(out, rc);
1331                 }
1332         }
1333
1334         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
1335         /*
1336          * Don't enqueue a lock onto the export if it is been disonnected
1337          * due to eviction (b=3822) or server umount (b=24324).
1338          * Cancel it now instead.
1339          */
1340         if (req->rq_export->exp_disconnected) {
1341                 LDLM_ERROR(lock, "lock on disconnected export %p",
1342                            req->rq_export);
1343                 GOTO(out, rc = -ENOTCONN);
1344         }
1345
1346         lock->l_export = class_export_lock_get(req->rq_export, lock);
1347         if (lock->l_export->exp_lock_hash)
1348                 cfs_hash_add(lock->l_export->exp_lock_hash,
1349                              &lock->l_remote_handle,
1350                              &lock->l_exp_hash);
1351
1352         /*
1353          * Inherit the enqueue flags before the operation, because we do not
1354          * keep the res lock on return and next operations (BL AST) may proceed
1355          * without them.
1356          */
1357         lock->l_flags |= ldlm_flags_from_wire(dlm_req->lock_flags &
1358                                               LDLM_FL_INHERIT_MASK);
1359
1360         ldlm_convert_policy_to_local(req->rq_export,
1361                                      dlm_req->lock_desc.l_resource.lr_type,
1362                                      &dlm_req->lock_desc.l_policy_data,
1363                                      &lock->l_policy_data);
1364         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT) {
1365                 lock->l_req_extent = lock->l_policy_data.l_extent;
1366         } else if (dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) {
1367                 lock->l_policy_data.l_inodebits.try_bits =
1368                         dlm_req->lock_desc.l_policy_data.l_inodebits.try_bits;
1369                 lock->l_policy_data.l_inodebits.li_gid =
1370                         dlm_req->lock_desc.l_policy_data.l_inodebits.li_gid;
1371         }
1372
1373 existing_lock:
1374         cookie = req;
1375         if (!(flags & LDLM_FL_HAS_INTENT)) {
1376                 /* based on the assumption that lvb size never changes during
1377                  * resource life time otherwise it need resource->lr_lock's
1378                  * protection */
1379                 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
1380                                      RCL_SERVER, ldlm_lvbo_size(lock));
1381
1382                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
1383                         GOTO(out, rc = -ENOMEM);
1384
1385                 rc = req_capsule_server_pack(&req->rq_pill);
1386                 if (rc)
1387                         GOTO(out, rc);
1388         }
1389
1390         err = ldlm_lock_enqueue(env, ns, &lock, cookie, &flags);
1391         if (err) {
1392                 if ((int)err < 0)
1393                         rc = (int)err;
1394                 GOTO(out, err);
1395         }
1396
1397         dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1398
1399         ldlm_lock2desc(lock, &dlm_rep->lock_desc);
1400         ldlm_lock2handle(lock, &dlm_rep->lock_handle);
1401
1402         if (lock && lock->l_resource->lr_type == LDLM_EXTENT)
1403                 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_BL_EVICT, 6);
1404
1405         /*
1406          * We never send a blocking AST until the lock is granted, but
1407          * we can tell it right now
1408          */
1409         lock_res_and_lock(lock);
1410
1411         /*
1412          * Now take into account flags to be inherited from original lock
1413          * request both in reply to client and in our own lock flags.
1414          */
1415         dlm_rep->lock_flags = ldlm_flags_to_wire(flags);
1416         lock->l_flags |= flags & LDLM_FL_INHERIT_MASK;
1417
1418         /*
1419          * Don't move a pending lock onto the export if it has already been
1420          * disconnected due to eviction (b=5683) or server umount (b=24324).
1421          * Cancel it now instead.
1422          */
1423         if (unlikely(req->rq_export->exp_disconnected ||
1424                      OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
1425                 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1426                 rc = -ENOTCONN;
1427         } else if (ldlm_is_ast_sent(lock)) {
1428                 /* fill lock desc for possible lock convert */
1429                 if (lock->l_blocking_lock &&
1430                     lock->l_resource->lr_type == LDLM_IBITS) {
1431                         struct ldlm_lock *bl_lock = lock->l_blocking_lock;
1432                         struct ldlm_lock_desc *rep_desc = &dlm_rep->lock_desc;
1433
1434                         LDLM_DEBUG(lock,
1435                                    "save blocking bits %llx in granted lock",
1436                                    bl_lock->l_policy_data.l_inodebits.bits);
1437                         /*
1438                          * If lock is blocked then save blocking ibits
1439                          * in returned lock policy for the possible lock
1440                          * convert on a client.
1441                          */
1442                         rep_desc->l_policy_data.l_inodebits.cancel_bits =
1443                                 bl_lock->l_policy_data.l_inodebits.bits;
1444                 }
1445                 dlm_rep->lock_flags |= ldlm_flags_to_wire(LDLM_FL_AST_SENT);
1446                 if (ldlm_is_granted(lock)) {
1447                         /*
1448                          * Only cancel lock if it was granted, because it would
1449                          * be destroyed immediately and would never be granted
1450                          * in the future, causing timeouts on client.  Not
1451                          * granted lock will be cancelled immediately after
1452                          * sending completion AST.
1453                          */
1454                         if (ldlm_is_cancel_on_block(lock)) {
1455                                 unlock_res_and_lock(lock);
1456                                 ldlm_lock_cancel(lock);
1457                                 lock_res_and_lock(lock);
1458                         } else {
1459                                 ldlm_add_waiting_lock(lock,
1460                                                       ldlm_bl_timeout(lock));
1461                         }
1462                 }
1463         }
1464         unlock_res_and_lock(lock);
1465
1466         EXIT;
1467 out:
1468         req->rq_status = rc ?: err; /* return either error - b=11190 */
1469         if (!req->rq_packed_final) {
1470                 int rc1 = lustre_pack_reply(req, 1, NULL, NULL);
1471                 if (rc == 0)
1472                         rc = rc1;
1473         }
1474
1475         /*
1476          * The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
1477          * ldlm_reprocess_all.  If this moves, revisit that code. -phil
1478          */
1479         if (lock != NULL) {
1480                 LDLM_DEBUG(lock,
1481                            "server-side enqueue handler, sending reply (err=%d, rc=%d)",
1482                            err, rc);
1483
1484                 if (rc == 0 &&
1485                     req_capsule_has_field(&req->rq_pill, &RMF_DLM_LVB,
1486                                           RCL_SERVER) &&
1487                     ldlm_lvbo_size(lock) > 0) {
1488                         void *buf;
1489                         int buflen;
1490
1491 retry:
1492                         buf = req_capsule_server_get(&req->rq_pill,
1493                                                      &RMF_DLM_LVB);
1494                         LASSERTF(buf != NULL, "req %p, lock %p\n", req, lock);
1495                         buflen = req_capsule_get_size(&req->rq_pill,
1496                                         &RMF_DLM_LVB, RCL_SERVER);
1497                         /*
1498                          * non-replayed lock, delayed lvb init may
1499                          * need to be occur now
1500                          */
1501                         if ((buflen > 0) && !(flags & LDLM_FL_REPLAY)) {
1502                                 int rc2;
1503
1504                                 rc2 = ldlm_lvbo_fill(lock, buf, &buflen);
1505                                 if (rc2 >= 0) {
1506                                         req_capsule_shrink(&req->rq_pill,
1507                                                            &RMF_DLM_LVB,
1508                                                            rc2, RCL_SERVER);
1509                                 } else if (rc2 == -ERANGE) {
1510                                         rc2 = req_capsule_server_grow(
1511                                                         &req->rq_pill,
1512                                                         &RMF_DLM_LVB, buflen);
1513                                         if (!rc2) {
1514                                                 goto retry;
1515                                         } else {
1516                                                 /*
1517                                                  * if we can't grow the buffer,
1518                                                  * it's ok to return empty lvb
1519                                                  * to client.
1520                                                  */
1521                                                 req_capsule_shrink(
1522                                                         &req->rq_pill,
1523                                                         &RMF_DLM_LVB, 0,
1524                                                         RCL_SERVER);
1525                                         }
1526                                 } else {
1527                                         rc = rc2;
1528                                 }
1529                         } else if (flags & LDLM_FL_REPLAY) {
1530                                 /* no LVB resend upon replay */
1531                                 if (buflen > 0)
1532                                         req_capsule_shrink(&req->rq_pill,
1533                                                            &RMF_DLM_LVB,
1534                                                            0, RCL_SERVER);
1535                                 else
1536                                         rc = buflen;
1537                         } else {
1538                                 rc = buflen;
1539                         }
1540                 }
1541
1542                 if (rc != 0 && !(flags & LDLM_FL_RESENT)) {
1543                         if (lock->l_export) {
1544                                 ldlm_lock_cancel(lock);
1545                         } else {
1546                                 lock_res_and_lock(lock);
1547                                 ldlm_resource_unlink_lock(lock);
1548                                 ldlm_lock_destroy_nolock(lock);
1549                                 unlock_res_and_lock(lock);
1550                         }
1551                         ldlm_reprocess_all(lock->l_resource, lock->l_policy_data.l_inodebits.bits);
1552                 }
1553
1554                 if (!err && !ldlm_is_cbpending(lock) &&
1555                     dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
1556                         ldlm_reprocess_all(lock->l_resource,
1557                                            lock->l_policy_data.l_inodebits.bits);
1558
1559                 LDLM_LOCK_RELEASE(lock);
1560         }
1561
1562         LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
1563                           lock, rc);
1564
1565         return rc;
1566 }
1567
1568 /*
1569  * Clear the blocking lock, the race is possible between ldlm_handle_convert0()
1570  * and ldlm_work_bl_ast_lock(), so this is done under lock with check for NULL.
1571  */
1572 void ldlm_clear_blocking_lock(struct ldlm_lock *lock)
1573 {
1574         if (lock->l_blocking_lock) {
1575                 LDLM_LOCK_RELEASE(lock->l_blocking_lock);
1576                 lock->l_blocking_lock = NULL;
1577         }
1578 }
1579
1580 /* A lock can be converted to new ibits or mode and should be considered
1581  * as new lock. Clear all states related to a previous blocking AST
1582  * processing so new conflicts will cause new blocking ASTs.
1583  *
1584  * This is used during lock convert below and lock downgrade to COS mode in
1585  * ldlm_lock_mode_downgrade().
1586  */
1587 void ldlm_clear_blocking_data(struct ldlm_lock *lock)
1588 {
1589         ldlm_clear_ast_sent(lock);
1590         lock->l_bl_ast_run = 0;
1591         ldlm_clear_blocking_lock(lock);
1592 }
1593
1594 /**
1595  * Main LDLM entry point for server code to process lock conversion requests.
1596  */
1597 int ldlm_handle_convert0(struct ptlrpc_request *req,
1598                          const struct ldlm_request *dlm_req)
1599 {
1600         struct obd_export *exp = req->rq_export;
1601         struct ldlm_reply *dlm_rep;
1602         struct ldlm_lock *lock;
1603         __u64 bits;
1604         __u64 new_bits;
1605         int rc;
1606
1607         ENTRY;
1608
1609         if (exp && exp->exp_nid_stats && exp->exp_nid_stats->nid_ldlm_stats)
1610                 lprocfs_counter_incr(exp->exp_nid_stats->nid_ldlm_stats,
1611                                      LDLM_CONVERT - LDLM_FIRST_OPC);
1612
1613         rc = req_capsule_server_pack(&req->rq_pill);
1614         if (rc)
1615                 RETURN(rc);
1616
1617         dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1618         dlm_rep->lock_flags = dlm_req->lock_flags;
1619
1620         lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
1621         if (!lock) {
1622                 LDLM_DEBUG_NOLOCK("server lock is canceled already");
1623                 req->rq_status = ELDLM_NO_LOCK_DATA;
1624                 RETURN(0);
1625         }
1626
1627         LDLM_DEBUG(lock, "server-side convert handler START");
1628
1629         lock_res_and_lock(lock);
1630         bits = lock->l_policy_data.l_inodebits.bits;
1631         new_bits = dlm_req->lock_desc.l_policy_data.l_inodebits.bits;
1632
1633         if (ldlm_is_cancel(lock)) {
1634                 LDLM_DEBUG(lock, "convert on canceled lock!");
1635                 unlock_res_and_lock(lock);
1636                 GOTO(out_put, rc = ELDLM_NO_LOCK_DATA);
1637         }
1638
1639         if (dlm_req->lock_desc.l_req_mode != lock->l_granted_mode) {
1640                 LDLM_ERROR(lock, "lock mode differs!");
1641                 unlock_res_and_lock(lock);
1642                 GOTO(out_put, rc = -EPROTO);
1643         }
1644
1645         if (bits == new_bits) {
1646                 /*
1647                  * This can be valid situation if CONVERT RPCs are
1648                  * re-ordered. Just finish silently
1649                  */
1650                 LDLM_DEBUG(lock, "lock is converted already!");
1651                 unlock_res_and_lock(lock);
1652         } else {
1653                 if (ldlm_is_waited(lock))
1654                         ldlm_del_waiting_lock(lock);
1655
1656                 ldlm_clear_cbpending(lock);
1657                 lock->l_policy_data.l_inodebits.cancel_bits = 0;
1658                 ldlm_inodebits_drop(lock, bits & ~new_bits);
1659
1660                 ldlm_clear_blocking_data(lock);
1661                 unlock_res_and_lock(lock);
1662
1663                 /* All old bits should be reprocessed to send new BL AST if
1664                  * it wasn't sent earlier due to LDLM_FL_AST_SENT bit set.
1665                  * */
1666                 ldlm_reprocess_all(lock->l_resource, bits);
1667         }
1668
1669         dlm_rep->lock_handle = lock->l_remote_handle;
1670         ldlm_ibits_policy_local_to_wire(&lock->l_policy_data,
1671                                         &dlm_rep->lock_desc.l_policy_data);
1672         rc = ELDLM_OK;
1673         EXIT;
1674 out_put:
1675         LDLM_DEBUG(lock, "server-side convert handler END, rc = %d", rc);
1676         LDLM_LOCK_PUT(lock);
1677         req->rq_status = rc;
1678         return 0;
1679 }
1680
1681 /**
1682  * Cancel all the locks whose handles are packed into ldlm_request
1683  *
1684  * Called by server code expecting such combined cancel activity
1685  * requests.
1686  */
1687 int ldlm_request_cancel(struct ptlrpc_request *req,
1688                         const struct ldlm_request *dlm_req,
1689                         int first, enum lustre_at_flags flags)
1690 {
1691         struct ldlm_resource *res, *pres = NULL;
1692         struct ldlm_lock *lock;
1693         int i, count, done = 0;
1694         unsigned int size;
1695
1696         ENTRY;
1697
1698         size = req_capsule_get_size(&req->rq_pill, &RMF_DLM_REQ, RCL_CLIENT);
1699         if (size <= offsetof(struct ldlm_request, lock_handle) ||
1700             (size - offsetof(struct ldlm_request, lock_handle)) /
1701              sizeof(struct lustre_handle) < dlm_req->lock_count)
1702                 RETURN(0);
1703
1704         count = dlm_req->lock_count ? dlm_req->lock_count : 1;
1705         if (first >= count)
1706                 RETURN(0);
1707
1708         if (count == 1 && dlm_req->lock_handle[0].cookie == 0)
1709                 RETURN(0);
1710
1711         /*
1712          * There is no lock on the server at the replay time,
1713          * skip lock cancelling to make replay tests to pass.
1714          */
1715         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1716                 RETURN(0);
1717
1718         LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, starting at %d",
1719                           count, first);
1720
1721         for (i = first; i < count; i++) {
1722                 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
1723                 if (!lock) {
1724                         /* below message checked in replay-single.sh test_36 */
1725                         LDLM_DEBUG_NOLOCK("server-side cancel handler stale lock (cookie %llu)",
1726                                           dlm_req->lock_handle[i].cookie);
1727                         continue;
1728                 }
1729
1730                 res = lock->l_resource;
1731                 done++;
1732
1733                 /*
1734                  * This code is an optimization to only attempt lock
1735                  * granting on the resource (that could be CPU-expensive)
1736                  * after we are done cancelling lock in that resource.
1737                  */
1738                 if (res != pres) {
1739                         if (pres != NULL) {
1740                                 ldlm_reprocess_all(pres, 0);
1741                                 LDLM_RESOURCE_DELREF(pres);
1742                                 ldlm_resource_putref(pres);
1743                         }
1744                         if (res != NULL) {
1745                                 ldlm_resource_getref(res);
1746                                 LDLM_RESOURCE_ADDREF(res);
1747
1748                                 if (!ldlm_is_discard_data(lock))
1749                                         ldlm_lvbo_update(res, lock,
1750                                                          NULL, 1);
1751                         }
1752                         pres = res;
1753                 }
1754
1755                 if ((flags & LATF_STATS) && ldlm_is_ast_sent(lock) &&
1756                     lock->l_blast_sent != 0) {
1757                         timeout_t delay = 0;
1758
1759                         if (ktime_get_seconds() > lock->l_blast_sent)
1760                                 delay = ktime_get_seconds() -
1761                                         lock->l_blast_sent;
1762                         LDLM_DEBUG(lock,
1763                                    "server cancels blocked lock after %ds",
1764                                    delay);
1765                         at_measured(&lock->l_export->exp_bl_lock_at, delay);
1766                 }
1767                 ldlm_lock_cancel(lock);
1768                 LDLM_LOCK_PUT(lock);
1769         }
1770         if (pres != NULL) {
1771                 ldlm_reprocess_all(pres, 0);
1772                 LDLM_RESOURCE_DELREF(pres);
1773                 ldlm_resource_putref(pres);
1774         }
1775         LDLM_DEBUG_NOLOCK("server-side cancel handler END");
1776         RETURN(done);
1777 }
1778 EXPORT_SYMBOL(ldlm_request_cancel);
1779
1780 /**
1781  * Main LDLM entry point for server code to cancel locks.
1782  *
1783  * Typically gets called from service handler on LDLM_CANCEL opc.
1784  */
1785 int ldlm_handle_cancel(struct ptlrpc_request *req)
1786 {
1787         struct ldlm_request *dlm_req;
1788         int rc;
1789
1790         ENTRY;
1791
1792         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1793         if (dlm_req == NULL) {
1794                 CDEBUG(D_INFO, "bad request buffer for cancel\n");
1795                 RETURN(-EFAULT);
1796         }
1797
1798         if (req_capsule_get_size(&req->rq_pill, &RMF_DLM_REQ, RCL_CLIENT) <
1799             offsetof(struct ldlm_request, lock_handle[1]))
1800                 RETURN(-EPROTO);
1801
1802         if (req->rq_export && req->rq_export->exp_nid_stats &&
1803             req->rq_export->exp_nid_stats->nid_ldlm_stats)
1804                 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1805                                      LDLM_CANCEL - LDLM_FIRST_OPC);
1806
1807         rc = req_capsule_server_pack(&req->rq_pill);
1808         if (rc)
1809                 RETURN(rc);
1810
1811         if (!ldlm_request_cancel(req, dlm_req, 0, LATF_STATS))
1812                 req->rq_status = LUSTRE_ESTALE;
1813
1814         RETURN(ptlrpc_reply(req));
1815 }
1816 #endif /* HAVE_SERVER_SUPPORT */
1817
1818 /**
1819  * Server may pass additional information about blocking lock.
1820  * For IBITS locks it is conflicting bits which can be used for
1821  * lock convert instead of cancel.
1822  */
1823 void ldlm_bl_desc2lock(const struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1824 {
1825         struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
1826
1827         check_res_locked(lock->l_resource);
1828         if (ns_is_client(ns) && ld &&
1829             (lock->l_resource->lr_type == LDLM_IBITS)) {
1830                 /*
1831                  * Lock description contains policy of blocking lock,
1832                  * and its cancel_bits is used to pass conflicting bits.
1833                  * NOTE: ld can be NULL or can be not NULL but zeroed if
1834                  * passed from ldlm_bl_thread_blwi(), check below used bits
1835                  * in ld to make sure it is valid description.
1836                  *
1837                  * If server may replace lock resource keeping the same cookie,
1838                  * never use cancel bits from different resource, full cancel
1839                  * is to be used.
1840                  */
1841                 if (ld->l_policy_data.l_inodebits.cancel_bits &&
1842                     ldlm_res_eq(&ld->l_resource.lr_name,
1843                                 &lock->l_resource->lr_name) &&
1844                     !(ldlm_is_cbpending(lock) &&
1845                       lock->l_policy_data.l_inodebits.cancel_bits == 0)) {
1846                         /* always combine conflicting ibits */
1847                         lock->l_policy_data.l_inodebits.cancel_bits |=
1848                                 ld->l_policy_data.l_inodebits.cancel_bits;
1849                 } else {
1850                         /* If cancel_bits are not obtained or
1851                          * if the lock is already CBPENDING and
1852                          * has no cancel_bits set
1853                          * - the full lock is to be cancelled
1854                          */
1855                         lock->l_policy_data.l_inodebits.cancel_bits = 0;
1856                 }
1857         }
1858 }
1859
1860 /**
1861  * Callback handler for receiving incoming blocking ASTs.
1862  *
1863  * This can only happen on client side.
1864  */
1865 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
1866                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1867 {
1868         int do_ast;
1869
1870         ENTRY;
1871
1872         LDLM_DEBUG(lock, "client blocking AST callback handler");
1873
1874         lock_res_and_lock(lock);
1875
1876         /* get extra information from desc if any */
1877         ldlm_bl_desc2lock(ld, lock);
1878         ldlm_set_cbpending(lock);
1879
1880         do_ast = (!lock->l_readers && !lock->l_writers);
1881         unlock_res_and_lock(lock);
1882
1883         if (do_ast) {
1884                 CDEBUG(D_DLMTRACE,
1885                        "Lock %p already unused, calling callback (%p)\n",
1886                        lock, lock->l_blocking_ast);
1887                 if (lock->l_blocking_ast != NULL)
1888                         lock->l_blocking_ast(lock, ld, lock->l_ast_data,
1889                                              LDLM_CB_BLOCKING);
1890         } else {
1891                 CDEBUG(D_DLMTRACE,
1892                        "Lock %p is referenced, will be cancelled later\n",
1893                        lock);
1894         }
1895
1896         LDLM_DEBUG(lock, "client blocking callback handler END");
1897         LDLM_LOCK_RELEASE(lock);
1898         EXIT;
1899 }
1900
1901 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1902 {
1903         if (req->rq_no_reply)
1904                 return 0;
1905
1906         req->rq_status = rc;
1907         if (!req->rq_packed_final) {
1908                 rc = lustre_pack_reply(req, 1, NULL, NULL);
1909                 if (rc)
1910                         return rc;
1911         }
1912         return ptlrpc_reply(req);
1913 }
1914
1915 /**
1916  * Callback handler for receiving incoming completion ASTs.
1917  *
1918  * This only can happen on client side.
1919  */
1920 static int ldlm_handle_cp_callback(struct ptlrpc_request *req,
1921                                     struct ldlm_namespace *ns,
1922                                     struct ldlm_request *dlm_req,
1923                                     struct ldlm_lock *lock)
1924 {
1925         LIST_HEAD(ast_list);
1926         int lvb_len;
1927         int rc = 0;
1928
1929         ENTRY;
1930
1931         LDLM_DEBUG(lock, "client completion callback handler START");
1932
1933         if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) {
1934                 long to = cfs_time_seconds(1);
1935
1936                 ldlm_callback_reply(req, 0);
1937
1938                 while (to > 0) {
1939                         to = schedule_timeout_interruptible(to);
1940                         if (ldlm_is_granted(lock) ||
1941                             ldlm_is_destroyed(lock))
1942                                 break;
1943                 }
1944         }
1945
1946         lvb_len = req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT);
1947         if (lvb_len < 0) {
1948                 LDLM_ERROR(lock, "Fail to get lvb_len, rc = %d", lvb_len);
1949                 GOTO(out, rc = lvb_len);
1950         } else if (lvb_len > 0) {
1951                 if (lock->l_lvb_len > 0) {
1952                         /* for extent lock, lvb contains ost_lvb{}. */
1953                         LASSERT(lock->l_lvb_data != NULL);
1954
1955                         if (unlikely(lock->l_lvb_len < lvb_len)) {
1956                                 LDLM_ERROR(lock,
1957                                            "Replied LVB is larger than expectation, expected = %d, replied = %d",
1958                                            lock->l_lvb_len, lvb_len);
1959                                 GOTO(out, rc = -EINVAL);
1960                         }
1961                 }
1962         }
1963
1964         lock_res_and_lock(lock);
1965
1966         if (!ldlm_res_eq(&dlm_req->lock_desc.l_resource.lr_name,
1967                          &lock->l_resource->lr_name)) {
1968                 ldlm_resource_unlink_lock(lock);
1969                 unlock_res_and_lock(lock);
1970                 rc = ldlm_lock_change_resource(ns, lock,
1971                                 &dlm_req->lock_desc.l_resource.lr_name);
1972                 if (rc < 0) {
1973                         LDLM_ERROR(lock, "Failed to allocate resource");
1974                         GOTO(out, rc);
1975                 }
1976                 LDLM_DEBUG(lock, "completion AST, new resource");
1977                 lock_res_and_lock(lock);
1978         }
1979
1980         if (ldlm_is_failed(lock)) {
1981                 unlock_res_and_lock(lock);
1982                 LDLM_LOCK_RELEASE(lock);
1983                 RETURN(-EINVAL);
1984         }
1985
1986         if (ldlm_is_destroyed(lock) ||
1987             ldlm_is_granted(lock)) {
1988                 /* b=11300: the lock has already been granted */
1989                 unlock_res_and_lock(lock);
1990                 LDLM_DEBUG(lock, "Double grant race happened");
1991                 GOTO(out, rc = 0);
1992         }
1993
1994         /*
1995          * If we receive the completion AST before the actual enqueue returned,
1996          * then we might need to switch lock modes, resources, or extents.
1997          */
1998         if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
1999                 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
2000                 LDLM_DEBUG(lock, "completion AST, new lock mode");
2001         }
2002
2003         if (lock->l_resource->lr_type != LDLM_PLAIN) {
2004                 ldlm_convert_policy_to_local(req->rq_export,
2005                                           dlm_req->lock_desc.l_resource.lr_type,
2006                                           &dlm_req->lock_desc.l_policy_data,
2007                                           &lock->l_policy_data);
2008                 LDLM_DEBUG(lock, "completion AST, new policy data");
2009         }
2010
2011         ldlm_resource_unlink_lock(lock);
2012
2013         if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
2014                 /*
2015                  * BL_AST locks are not needed in LRU.
2016                  * Let ldlm_cancel_lru() be fast.
2017                  */
2018                 ldlm_lock_remove_from_lru(lock);
2019                 ldlm_bl_desc2lock(&dlm_req->lock_desc, lock);
2020                 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
2021                 LDLM_DEBUG(lock, "completion AST includes blocking AST");
2022         }
2023
2024         if (lock->l_lvb_len > 0) {
2025                 rc = ldlm_fill_lvb(lock, &req->rq_pill, RCL_CLIENT,
2026                                    lock->l_lvb_data, lvb_len);
2027                 if (rc < 0) {
2028                         unlock_res_and_lock(lock);
2029                         GOTO(out, rc);
2030                 }
2031         }
2032
2033         ldlm_grant_lock(lock, &ast_list);
2034         unlock_res_and_lock(lock);
2035
2036         LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
2037
2038         /*
2039          * Let Enqueue to call osc_lock_upcall() and initialize
2040          * l_ast_data
2041          */
2042         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 2);
2043
2044         ldlm_run_ast_work(ns, &ast_list, LDLM_WORK_CP_AST);
2045
2046         LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
2047                           lock);
2048         GOTO(out, rc);
2049
2050 out:
2051         if (rc < 0) {
2052                 lock_res_and_lock(lock);
2053                 ldlm_set_failed(lock);
2054                 unlock_res_and_lock(lock);
2055                 wake_up(&lock->l_waitq);
2056         }
2057         LDLM_LOCK_RELEASE(lock);
2058
2059         return 0;
2060 }
2061
2062 /**
2063  * Callback handler for receiving incoming glimpse ASTs.
2064  *
2065  * This only can happen on client side.  After handling the glimpse AST
2066  * we also consider dropping the lock here if it is unused locally for a
2067  * long time.
2068  */
2069 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
2070                                     struct ldlm_namespace *ns,
2071                                     struct ldlm_request *dlm_req,
2072                                     struct ldlm_lock *lock)
2073 {
2074         struct ldlm_lock_desc *ld = &dlm_req->lock_desc;
2075         int rc = -ENOSYS;
2076
2077         ENTRY;
2078
2079         LDLM_DEBUG(lock, "client glimpse AST callback handler");
2080
2081         if (lock->l_glimpse_ast != NULL)
2082                 rc = lock->l_glimpse_ast(lock, req);
2083
2084         if (req->rq_repmsg != NULL) {
2085                 ptlrpc_reply(req);
2086         } else {
2087                 req->rq_status = rc;
2088                 ptlrpc_error(req);
2089         }
2090
2091         lock_res_and_lock(lock);
2092         if (lock->l_granted_mode == LCK_PW &&
2093             !lock->l_readers && !lock->l_writers &&
2094             ktime_after(ktime_get(),
2095                         ktime_add(lock->l_last_used, ns->ns_dirty_age_limit))) {
2096                 unlock_res_and_lock(lock);
2097
2098                 /* For MDS glimpse it is always DOM lock, set corresponding
2099                  * cancel_bits to perform lock convert if needed
2100                  */
2101                 if (lock->l_resource->lr_type == LDLM_IBITS)
2102                         ld->l_policy_data.l_inodebits.cancel_bits =
2103                                                         MDS_INODELOCK_DOM;
2104                 if (ldlm_bl_to_thread_lock(ns, ld, lock))
2105                         ldlm_handle_bl_callback(ns, ld, lock);
2106
2107                 EXIT;
2108                 return;
2109         }
2110         unlock_res_and_lock(lock);
2111         LDLM_LOCK_RELEASE(lock);
2112         EXIT;
2113 }
2114
2115 static int __ldlm_bl_to_thread(struct ldlm_bl_work_item *blwi,
2116                                enum ldlm_cancel_flags cancel_flags)
2117 {
2118         struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
2119
2120         ENTRY;
2121
2122         spin_lock(&blp->blp_lock);
2123         if (blwi->blwi_lock &&
2124             ldlm_is_discard_data(blwi->blwi_lock)) {
2125                 /* add LDLM_FL_DISCARD_DATA requests to the priority list */
2126                 list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
2127         } else {
2128                 /* other blocking callbacks are added to the regular list */
2129                 list_add_tail(&blwi->blwi_entry, &blp->blp_list);
2130         }
2131         spin_unlock(&blp->blp_lock);
2132
2133         wake_up(&blp->blp_waitq);
2134
2135         /*
2136          * can not check blwi->blwi_flags as blwi could be already freed in
2137          * LCF_ASYNC mode
2138          */
2139         if (!(cancel_flags & LCF_ASYNC))
2140                 wait_for_completion(&blwi->blwi_comp);
2141
2142         RETURN(0);
2143 }
2144
2145 static inline void init_blwi(struct ldlm_bl_work_item *blwi,
2146                              struct ldlm_namespace *ns,
2147                              struct ldlm_lock_desc *ld,
2148                              struct list_head *cancels, int count,
2149                              struct ldlm_lock *lock,
2150                              enum ldlm_cancel_flags cancel_flags)
2151 {
2152         init_completion(&blwi->blwi_comp);
2153         INIT_LIST_HEAD(&blwi->blwi_head);
2154
2155         if (current->flags & PF_MEMALLOC)
2156                 blwi->blwi_mem_pressure = 1;
2157
2158         blwi->blwi_ns = ns;
2159         blwi->blwi_flags = cancel_flags;
2160         if (ld != NULL)
2161                 blwi->blwi_ld = *ld;
2162         if (count) {
2163                 list_splice_init(cancels, &blwi->blwi_head);
2164                 blwi->blwi_count = count;
2165         } else {
2166                 blwi->blwi_lock = lock;
2167         }
2168 }
2169
2170 /**
2171  * Queues a list of locks \a cancels containing \a count locks
2172  * for later processing by a blocking thread.  If \a count is zero,
2173  * then the lock referenced as \a lock is queued instead.
2174  *
2175  * The blocking thread would then call ->l_blocking_ast callback in the lock.
2176  * If list addition fails an error is returned and caller is supposed to
2177  * call ->l_blocking_ast itself.
2178  */
2179 static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
2180                              struct ldlm_lock_desc *ld,
2181                              struct ldlm_lock *lock,
2182                              struct list_head *cancels, int count,
2183                              enum ldlm_cancel_flags cancel_flags)
2184 {
2185         ENTRY;
2186
2187         if (cancels && count == 0)
2188                 RETURN(0);
2189
2190         if (cancel_flags & LCF_ASYNC) {
2191                 struct ldlm_bl_work_item *blwi;
2192
2193                 OBD_ALLOC(blwi, sizeof(*blwi));
2194                 if (blwi == NULL)
2195                         RETURN(-ENOMEM);
2196                 init_blwi(blwi, ns, ld, cancels, count, lock, cancel_flags);
2197
2198                 RETURN(__ldlm_bl_to_thread(blwi, cancel_flags));
2199         } else {
2200                 /*
2201                  * if it is synchronous call do minimum mem alloc, as it could
2202                  * be triggered from kernel shrinker
2203                  */
2204                 struct ldlm_bl_work_item blwi;
2205
2206                 memset(&blwi, 0, sizeof(blwi));
2207                 init_blwi(&blwi, ns, ld, cancels, count, lock, cancel_flags);
2208                 RETURN(__ldlm_bl_to_thread(&blwi, cancel_flags));
2209         }
2210 }
2211
2212
2213 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
2214                            struct ldlm_lock *lock)
2215 {
2216         return ldlm_bl_to_thread(ns, ld, lock, NULL, 0, LCF_ASYNC);
2217 }
2218
2219 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
2220                            struct list_head *cancels, int count,
2221                            enum ldlm_cancel_flags cancel_flags)
2222 {
2223         return ldlm_bl_to_thread(ns, ld, NULL, cancels, count, cancel_flags);
2224 }
2225
2226 int ldlm_bl_to_thread_ns(struct ldlm_namespace *ns)
2227 {
2228         return ldlm_bl_to_thread(ns, NULL, NULL, NULL, 0, LCF_ASYNC);
2229 }
2230
2231 int ldlm_bl_thread_wakeup(void)
2232 {
2233         wake_up(&ldlm_state->ldlm_bl_pool->blp_waitq);
2234         return 0;
2235 }
2236
2237 /* Setinfo coming from Server (eg MDT) to Client (eg MDC)! */
2238 static int ldlm_handle_setinfo(struct ptlrpc_request *req)
2239 {
2240         struct obd_device *obd = req->rq_export->exp_obd;
2241         char *key;
2242         void *val;
2243         int keylen, vallen;
2244         int rc = -ENOSYS;
2245
2246         ENTRY;
2247
2248         DEBUG_REQ(D_HSM, req, "%s: handle setinfo", obd->obd_name);
2249
2250         req_capsule_set(&req->rq_pill, &RQF_OBD_SET_INFO);
2251
2252         key = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
2253         if (key == NULL) {
2254                 DEBUG_REQ(D_IOCTL, req, "no set_info key");
2255                 RETURN(-EFAULT);
2256         }
2257         keylen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_KEY,
2258                                       RCL_CLIENT);
2259         val = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
2260         if (val == NULL) {
2261                 DEBUG_REQ(D_IOCTL, req, "no set_info val");
2262                 RETURN(-EFAULT);
2263         }
2264         vallen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_VAL,
2265                                       RCL_CLIENT);
2266
2267         /* We are responsible for swabbing contents of val */
2268
2269         if (KEY_IS(KEY_HSM_COPYTOOL_SEND))
2270                 /* Pass it on to mdc (the "export" in this case) */
2271                 rc = obd_set_info_async(req->rq_svc_thread->t_env,
2272                                         req->rq_export,
2273                                         sizeof(KEY_HSM_COPYTOOL_SEND),
2274                                         KEY_HSM_COPYTOOL_SEND,
2275                                         vallen, val, NULL);
2276         else
2277                 DEBUG_REQ(D_WARNING, req, "ignoring unknown key '%s'", key);
2278
2279         return rc;
2280 }
2281
2282 static inline void ldlm_callback_errmsg(struct ptlrpc_request *req,
2283                                         const char *msg, int rc,
2284                                         const struct lustre_handle *handle)
2285 {
2286         DEBUG_REQ((req->rq_no_reply || rc) ? D_WARNING : D_DLMTRACE, req,
2287                   "%s, NID=%s lock=%#llx: rc = %d",
2288                   msg, libcfs_id2str(req->rq_peer),
2289                   handle ? handle->cookie : 0, rc);
2290         if (req->rq_no_reply)
2291                 CWARN("No reply was sent, maybe cause b=21636.\n");
2292         else if (rc)
2293                 CWARN("Send reply failed, maybe cause b=21636.\n");
2294 }
2295
2296 /* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */
2297 static int ldlm_callback_handler(struct ptlrpc_request *req)
2298 {
2299         struct ldlm_namespace *ns;
2300         struct ldlm_request *dlm_req;
2301         struct ldlm_lock *lock;
2302         int rc;
2303
2304         ENTRY;
2305
2306         /*
2307          * Requests arrive in sender's byte order.  The ptlrpc service
2308          * handler has already checked and, if necessary, byte-swapped the
2309          * incoming request message body, but I am responsible for the
2310          * message buffers.
2311          */
2312
2313         /* do nothing for sec context finalize */
2314         if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI)
2315                 RETURN(0);
2316
2317         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2318
2319         if (req->rq_export == NULL) {
2320                 rc = ldlm_callback_reply(req, -ENOTCONN);
2321                 ldlm_callback_errmsg(req, "Operate on unconnected server",
2322                                      rc, NULL);
2323                 RETURN(0);
2324         }
2325
2326         LASSERT(req->rq_export != NULL);
2327         LASSERT(req->rq_export->exp_obd != NULL);
2328
2329         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2330         case LDLM_BL_CALLBACK:
2331                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET)) {
2332                         if (cfs_fail_err)
2333                                 ldlm_callback_reply(req, -(int)cfs_fail_err);
2334                         RETURN(0);
2335                 }
2336                 break;
2337         case LDLM_CP_CALLBACK:
2338                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK_NET))
2339                         RETURN(0);
2340                 break;
2341         case LDLM_GL_CALLBACK:
2342                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK_NET))
2343                         RETURN(0);
2344                 break;
2345         case LDLM_SET_INFO:
2346                 rc = ldlm_handle_setinfo(req);
2347                 ldlm_callback_reply(req, rc);
2348                 RETURN(0);
2349         default:
2350                 CERROR("unknown opcode %u\n",
2351                        lustre_msg_get_opc(req->rq_reqmsg));
2352                 ldlm_callback_reply(req, -EPROTO);
2353                 RETURN(0);
2354         }
2355
2356         ns = req->rq_export->exp_obd->obd_namespace;
2357         LASSERT(ns != NULL);
2358
2359         req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2360
2361         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2362         if (dlm_req == NULL) {
2363                 rc = ldlm_callback_reply(req, -EPROTO);
2364                 ldlm_callback_errmsg(req, "Operate without parameter", rc,
2365                                      NULL);
2366                 RETURN(0);
2367         }
2368
2369         /*
2370          * Force a known safe race, send a cancel to the server for a lock
2371          * which the server has already started a blocking callback on.
2372          */
2373         if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE) &&
2374             lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
2375                 rc = ldlm_cli_cancel(&dlm_req->lock_handle[0], 0);
2376                 if (rc < 0)
2377                         CERROR("ldlm_cli_cancel: %d\n", rc);
2378         }
2379
2380         lock = ldlm_handle2lock_long(&dlm_req->lock_handle[0], 0);
2381         if (!lock) {
2382                 CDEBUG(D_DLMTRACE,
2383                        "callback on lock %#llx - lock disappeared\n",
2384                        dlm_req->lock_handle[0].cookie);
2385                 rc = ldlm_callback_reply(req, -EINVAL);
2386                 ldlm_callback_errmsg(req, "Operate with invalid parameter", rc,
2387                                      &dlm_req->lock_handle[0]);
2388                 RETURN(0);
2389         }
2390
2391         if (ldlm_is_fail_loc(lock) &&
2392             lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK)
2393                 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
2394
2395         /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
2396         lock_res_and_lock(lock);
2397         lock->l_flags |= ldlm_flags_from_wire(dlm_req->lock_flags &
2398                                               LDLM_FL_AST_MASK);
2399         if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
2400                 /*
2401                  * If somebody cancels lock and cache is already dropped,
2402                  * or lock is failed before cp_ast received on client,
2403                  * we can tell the server we have no lock. Otherwise, we
2404                  * should send cancel after dropping the cache.
2405                  */
2406                 if ((ldlm_is_canceling(lock) && ldlm_is_bl_done(lock)) ||
2407                      ldlm_is_failed(lock)) {
2408                         LDLM_DEBUG(lock,
2409                                    "callback on lock %llx - lock disappeared",
2410                                    dlm_req->lock_handle[0].cookie);
2411                         unlock_res_and_lock(lock);
2412                         LDLM_LOCK_RELEASE(lock);
2413                         rc = ldlm_callback_reply(req, -EINVAL);
2414                         ldlm_callback_errmsg(req, "Operate on stale lock", rc,
2415                                              &dlm_req->lock_handle[0]);
2416                         RETURN(0);
2417                 }
2418                 /*
2419                  * BL_AST locks are not needed in LRU.
2420                  * Let ldlm_cancel_lru() be fast.
2421                  */
2422                 ldlm_lock_remove_from_lru(lock);
2423                 ldlm_set_bl_ast(lock);
2424         }
2425         if (lock->l_remote_handle.cookie == 0)
2426                 lock->l_remote_handle = dlm_req->lock_handle[1];
2427         unlock_res_and_lock(lock);
2428
2429         /*
2430          * We want the ost thread to get this reply so that it can respond
2431          * to ost requests (write cache writeback) that might be triggered
2432          * in the callback.
2433          *
2434          * But we'd also like to be able to indicate in the reply that we're
2435          * cancelling right now, because it's unused, or have an intent result
2436          * in the reply, so we might have to push the responsibility for sending
2437          * the reply down into the AST handlers, alas.
2438          */
2439
2440         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2441         case LDLM_BL_CALLBACK:
2442                 CDEBUG(D_INODE, "blocking ast\n");
2443                 req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
2444                 if (!ldlm_is_cancel_on_block(lock)) {
2445                         rc = ldlm_callback_reply(req, 0);
2446                         if (req->rq_no_reply || rc)
2447                                 ldlm_callback_errmsg(req, "Normal process", rc,
2448                                                      &dlm_req->lock_handle[0]);
2449                 }
2450                 if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
2451                         ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
2452                 break;
2453         case LDLM_CP_CALLBACK:
2454                 CDEBUG(D_INODE, "completion ast\n");
2455                 req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
2456                 rc = ldlm_handle_cp_callback(req, ns, dlm_req, lock);
2457                 if (!OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE))
2458                         ldlm_callback_reply(req, rc);
2459                 break;
2460         case LDLM_GL_CALLBACK:
2461                 CDEBUG(D_INODE, "glimpse ast\n");
2462                 req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
2463                 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
2464                 break;
2465         default:
2466                 LBUG(); /* checked above */
2467         }
2468
2469         RETURN(0);
2470 }
2471
2472 #ifdef HAVE_SERVER_SUPPORT
2473 /**
2474  * Main handler for canceld thread.
2475  *
2476  * Separated into its own thread to avoid deadlocks.
2477  */
2478 static int ldlm_cancel_handler(struct ptlrpc_request *req)
2479 {
2480         int rc;
2481
2482         ENTRY;
2483
2484         /*
2485          * Requests arrive in sender's byte order.  The ptlrpc service
2486          * handler has already checked and, if necessary, byte-swapped the
2487          * incoming request message body, but I am responsible for the
2488          * message buffers.
2489          */
2490
2491         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2492
2493         if (req->rq_export == NULL) {
2494                 struct ldlm_request *dlm_req;
2495
2496                 CERROR("%s from %s arrived at %llu with bad export cookie %llu\n",
2497                        ll_opcode2str(lustre_msg_get_opc(req->rq_reqmsg)),
2498                        libcfs_nid2str(req->rq_peer.nid),
2499                        (unsigned long long)req->rq_arrival_time.tv_sec,
2500                        lustre_msg_get_handle(req->rq_reqmsg)->cookie);
2501
2502                 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_CANCEL) {
2503                         req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2504                         dlm_req = req_capsule_client_get(&req->rq_pill,
2505                                                          &RMF_DLM_REQ);
2506                         if (dlm_req != NULL)
2507                                 ldlm_lock_dump_handle(D_ERROR,
2508                                                       &dlm_req->lock_handle[0]);
2509                 }
2510                 ldlm_callback_reply(req, -ENOTCONN);
2511                 RETURN(0);
2512         }
2513
2514         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2515         /* XXX FIXME move this back to mds/handler.c, b=249 */
2516         case LDLM_CANCEL:
2517                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
2518                 CDEBUG(D_INODE, "cancel\n");
2519                 if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_NET) ||
2520                     CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND) ||
2521                     CFS_FAIL_CHECK(OBD_FAIL_LDLM_BL_EVICT))
2522                         RETURN(0);
2523                 rc = ldlm_handle_cancel(req);
2524                 break;
2525         case LDLM_CONVERT:
2526         {
2527                 struct ldlm_request *dlm_req;
2528
2529                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CONVERT);
2530                 CDEBUG(D_INODE, "convert\n");
2531
2532                 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2533                 if (dlm_req == NULL) {
2534                         CDEBUG(D_INFO, "bad request buffer for cancel\n");
2535                         rc = ldlm_callback_reply(req, -EPROTO);
2536                 } else {
2537                         req->rq_status = ldlm_handle_convert0(req, dlm_req);
2538                         rc = ptlrpc_reply(req);
2539                 }
2540                 break;
2541         }
2542         default:
2543                 CERROR("invalid opcode %d\n",
2544                        lustre_msg_get_opc(req->rq_reqmsg));
2545                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2546                 rc = ldlm_callback_reply(req, -EINVAL);
2547         }
2548
2549         RETURN(rc);
2550 }
2551
2552 static int ldlm_cancel_hpreq_lock_match(struct ptlrpc_request *req,
2553                                         struct ldlm_lock *lock)
2554 {
2555         struct ldlm_request *dlm_req;
2556         struct lustre_handle lockh;
2557         int rc = 0;
2558         int i;
2559
2560         ENTRY;
2561
2562         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2563         if (dlm_req == NULL)
2564                 RETURN(0);
2565
2566         ldlm_lock2handle(lock, &lockh);
2567         for (i = 0; i < dlm_req->lock_count; i++) {
2568                 if (lustre_handle_equal(&dlm_req->lock_handle[i],
2569                                         &lockh)) {
2570                         DEBUG_REQ(D_RPCTRACE, req,
2571                                   "Prio raised by lock %#llx", lockh.cookie);
2572                         rc = 1;
2573                         break;
2574                 }
2575         }
2576
2577         RETURN(rc);
2578 }
2579
2580 static int ldlm_cancel_hpreq_check(struct ptlrpc_request *req)
2581 {
2582         struct ldlm_request *dlm_req;
2583         int rc = 0;
2584         int i;
2585         unsigned int size;
2586
2587         ENTRY;
2588
2589         /* no prolong in recovery */
2590         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
2591                 RETURN(0);
2592
2593         dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2594         if (dlm_req == NULL)
2595                 RETURN(-EFAULT);
2596
2597         size = req_capsule_get_size(&req->rq_pill, &RMF_DLM_REQ, RCL_CLIENT);
2598         if (size <= offsetof(struct ldlm_request, lock_handle) ||
2599             (size - offsetof(struct ldlm_request, lock_handle)) /
2600              sizeof(struct lustre_handle) < dlm_req->lock_count)
2601                 RETURN(-EPROTO);
2602
2603         for (i = 0; i < dlm_req->lock_count; i++) {
2604                 struct ldlm_lock *lock;
2605
2606                 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
2607                 if (lock == NULL)
2608                         continue;
2609
2610                 rc = ldlm_is_ast_sent(lock) ? 1 : 0;
2611                 if (rc)
2612                         LDLM_DEBUG(lock, "hpreq cancel/convert lock");
2613                 LDLM_LOCK_PUT(lock);
2614
2615                 if (rc)
2616                         break;
2617         }
2618
2619         RETURN(rc);
2620 }
2621
2622 static struct ptlrpc_hpreq_ops ldlm_cancel_hpreq_ops = {
2623         .hpreq_lock_match = ldlm_cancel_hpreq_lock_match,
2624         .hpreq_check      = ldlm_cancel_hpreq_check,
2625         .hpreq_fini       = NULL,
2626 };
2627
2628 static int ldlm_hpreq_handler(struct ptlrpc_request *req)
2629 {
2630         ENTRY;
2631
2632         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2633
2634         if (req->rq_export == NULL)
2635                 RETURN(0);
2636
2637         if (LDLM_CANCEL == lustre_msg_get_opc(req->rq_reqmsg)) {
2638                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
2639                 req->rq_ops = &ldlm_cancel_hpreq_ops;
2640         } else if (LDLM_CONVERT == lustre_msg_get_opc(req->rq_reqmsg)) {
2641                 req_capsule_set(&req->rq_pill, &RQF_LDLM_CONVERT);
2642                 req->rq_ops = &ldlm_cancel_hpreq_ops;
2643         }
2644         RETURN(0);
2645 }
2646
2647 static int ldlm_revoke_lock_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
2648                                struct hlist_node *hnode, void *data)
2649
2650 {
2651         struct list_head *rpc_list = data;
2652         struct ldlm_lock *lock = cfs_hash_object(hs, hnode);
2653
2654         lock_res_and_lock(lock);
2655
2656         if (!ldlm_is_granted(lock)) {
2657                 unlock_res_and_lock(lock);
2658                 return 0;
2659         }
2660
2661         LASSERT(lock->l_resource);
2662         if (lock->l_resource->lr_type != LDLM_IBITS &&
2663             lock->l_resource->lr_type != LDLM_PLAIN) {
2664                 unlock_res_and_lock(lock);
2665                 return 0;
2666         }
2667
2668         if (ldlm_is_ast_sent(lock)) {
2669                 unlock_res_and_lock(lock);
2670                 return 0;
2671         }
2672
2673         LASSERT(lock->l_blocking_ast);
2674         LASSERT(!lock->l_blocking_lock);
2675
2676         ldlm_set_ast_sent(lock);
2677         if (lock->l_export && lock->l_export->exp_lock_hash) {
2678                 /*
2679                  * NB: it's safe to call cfs_hash_del() even lock isn't
2680                  * in exp_lock_hash.
2681                  */
2682                 /*
2683                  * In the function below, .hs_keycmp resolves to
2684                  * ldlm_export_lock_keycmp()
2685                  */
2686                 /* coverity[overrun-buffer-val] */
2687                 cfs_hash_del(lock->l_export->exp_lock_hash,
2688                              &lock->l_remote_handle, &lock->l_exp_hash);
2689         }
2690
2691         list_add_tail(&lock->l_rk_ast, rpc_list);
2692         LDLM_LOCK_GET(lock);
2693
2694         unlock_res_and_lock(lock);
2695         return 0;
2696 }
2697
2698 void ldlm_revoke_export_locks(struct obd_export *exp)
2699 {
2700         int rc;
2701         LIST_HEAD(rpc_list);
2702         ENTRY;
2703
2704         cfs_hash_for_each_nolock(exp->exp_lock_hash,
2705                                  ldlm_revoke_lock_cb, &rpc_list, 0);
2706         rc = ldlm_run_ast_work(exp->exp_obd->obd_namespace, &rpc_list,
2707                           LDLM_WORK_REVOKE_AST);
2708
2709         if (rc == -ERESTART)
2710                 ldlm_reprocess_recovery_done(exp->exp_obd->obd_namespace);
2711
2712         EXIT;
2713 }
2714 EXPORT_SYMBOL(ldlm_revoke_export_locks);
2715 #endif /* HAVE_SERVER_SUPPORT */
2716
2717 static int ldlm_bl_get_work(struct ldlm_bl_pool *blp,
2718                             struct ldlm_bl_work_item **p_blwi,
2719                             struct obd_export **p_exp)
2720 {
2721         struct ldlm_bl_work_item *blwi = NULL;
2722         static unsigned int num_bl;
2723         static unsigned int num_stale;
2724         int num_th = atomic_read(&blp->blp_num_threads);
2725
2726         *p_exp = obd_stale_export_get();
2727
2728         spin_lock(&blp->blp_lock);
2729         if (*p_exp != NULL) {
2730                 if (num_th == 1 || ++num_stale < num_th) {
2731                         spin_unlock(&blp->blp_lock);
2732                         return 1;
2733                 }
2734                 num_stale = 0;
2735         }
2736
2737         /* process a request from the blp_list at least every blp_num_threads */
2738         if (!list_empty(&blp->blp_list) &&
2739             (list_empty(&blp->blp_prio_list) || num_bl == 0))
2740                 blwi = list_entry(blp->blp_list.next,
2741                                   struct ldlm_bl_work_item, blwi_entry);
2742         else
2743                 if (!list_empty(&blp->blp_prio_list))
2744                         blwi = list_entry(blp->blp_prio_list.next,
2745                                           struct ldlm_bl_work_item,
2746                                           blwi_entry);
2747
2748         if (blwi) {
2749                 if (++num_bl >= num_th)
2750                         num_bl = 0;
2751                 list_del(&blwi->blwi_entry);
2752         }
2753         spin_unlock(&blp->blp_lock);
2754         *p_blwi = blwi;
2755
2756         if (*p_exp != NULL && *p_blwi != NULL) {
2757                 obd_stale_export_put(*p_exp);
2758                 *p_exp = NULL;
2759         }
2760
2761         return (*p_blwi != NULL || *p_exp != NULL) ? 1 : 0;
2762 }
2763
2764 /* This only contains temporary data until the thread starts */
2765 struct ldlm_bl_thread_data {
2766         struct ldlm_bl_pool     *bltd_blp;
2767         struct completion       bltd_comp;
2768         int                     bltd_num;
2769 };
2770
2771 static int ldlm_bl_thread_main(void *arg);
2772
2773 static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp, bool check_busy)
2774 {
2775         struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
2776         struct task_struct *task;
2777
2778         init_completion(&bltd.bltd_comp);
2779
2780         bltd.bltd_num = atomic_inc_return(&blp->blp_num_threads);
2781         if (bltd.bltd_num >= blp->blp_max_threads) {
2782                 atomic_dec(&blp->blp_num_threads);
2783                 return 0;
2784         }
2785
2786         LASSERTF(bltd.bltd_num > 0, "thread num:%d\n", bltd.bltd_num);
2787         if (check_busy &&
2788             atomic_read(&blp->blp_busy_threads) < (bltd.bltd_num - 1)) {
2789                 atomic_dec(&blp->blp_num_threads);
2790                 return 0;
2791         }
2792
2793         task = kthread_run(ldlm_bl_thread_main, &bltd, "ldlm_bl_%02d",
2794                            bltd.bltd_num);
2795         if (IS_ERR(task)) {
2796                 CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %ld\n",
2797                        bltd.bltd_num, PTR_ERR(task));
2798                 atomic_dec(&blp->blp_num_threads);
2799                 return PTR_ERR(task);
2800         }
2801         wait_for_completion(&bltd.bltd_comp);
2802
2803         return 0;
2804 }
2805
2806 /* Not fatal if racy and have a few too many threads */
2807 static int ldlm_bl_thread_need_create(struct ldlm_bl_pool *blp,
2808                                       struct ldlm_bl_work_item *blwi)
2809 {
2810         if (atomic_read(&blp->blp_num_threads) >= blp->blp_max_threads)
2811                 return 0;
2812
2813         if (atomic_read(&blp->blp_busy_threads) <
2814             atomic_read(&blp->blp_num_threads))
2815                 return 0;
2816
2817         if (blwi != NULL && (blwi->blwi_ns == NULL ||
2818                              blwi->blwi_mem_pressure))
2819                 return 0;
2820
2821         return 1;
2822 }
2823
2824 static int ldlm_bl_thread_blwi(struct ldlm_bl_pool *blp,
2825                                struct ldlm_bl_work_item *blwi)
2826 {
2827         /* '1' for consistency with code that checks !mpflag to restore */
2828         unsigned int mpflags = 1;
2829
2830         ENTRY;
2831
2832         if (blwi->blwi_ns == NULL)
2833                 /* added by ldlm_cleanup() */
2834                 RETURN(LDLM_ITER_STOP);
2835
2836         if (blwi->blwi_mem_pressure)
2837                 mpflags = memalloc_noreclaim_save();
2838
2839         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_PAUSE_CANCEL2, 4);
2840
2841         if (blwi->blwi_count) {
2842                 int count;
2843                 /*
2844                  * The special case when we cancel locks in lru
2845                  * asynchronously, we pass the list of locks here.
2846                  * Thus locks are marked LDLM_FL_CANCELING, but NOT
2847                  * canceled locally yet.
2848                  */
2849                 count = ldlm_cli_cancel_list_local(&blwi->blwi_head,
2850                                                    blwi->blwi_count,
2851                                                    LCF_BL_AST);
2852                 ldlm_cli_cancel_list(&blwi->blwi_head, count, NULL,
2853                                      blwi->blwi_flags);
2854         } else if (blwi->blwi_lock) {
2855                 ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
2856                                         blwi->blwi_lock);
2857         } else {
2858                 ldlm_pool_recalc(&blwi->blwi_ns->ns_pool, true);
2859                 spin_lock(&blwi->blwi_ns->ns_lock);
2860                 blwi->blwi_ns->ns_rpc_recalc = 0;
2861                 spin_unlock(&blwi->blwi_ns->ns_lock);
2862                 ldlm_namespace_put(blwi->blwi_ns);
2863         }
2864
2865         if (blwi->blwi_mem_pressure)
2866                 memalloc_noreclaim_restore(mpflags);
2867
2868         if (blwi->blwi_flags & LCF_ASYNC)
2869                 OBD_FREE(blwi, sizeof(*blwi));
2870         else
2871                 complete(&blwi->blwi_comp);
2872
2873         RETURN(0);
2874 }
2875
2876 /**
2877  * Cancel stale locks on export. Cancel blocked locks first.
2878  * If the given export has blocked locks, the next in the list may have
2879  * them too, thus cancel not blocked locks only if the current export has
2880  * no blocked locks.
2881  **/
2882 static int ldlm_bl_thread_exports(struct ldlm_bl_pool *blp,
2883                                   struct obd_export *exp)
2884 {
2885         int num;
2886
2887         ENTRY;
2888
2889         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_BL_EVICT, 4);
2890
2891         num = ldlm_export_cancel_blocked_locks(exp);
2892         if (num == 0)
2893                 ldlm_export_cancel_locks(exp);
2894
2895         obd_stale_export_put(exp);
2896
2897         RETURN(0);
2898 }
2899
2900
2901 /**
2902  * Main blocking requests processing thread.
2903  *
2904  * Callers put locks into its queue by calling ldlm_bl_to_thread.
2905  * This thread in the end ends up doing actual call to ->l_blocking_ast
2906  * for queued locks.
2907  */
2908 static int ldlm_bl_thread_main(void *arg)
2909 {
2910         struct lu_env *env;
2911         struct ldlm_bl_pool *blp;
2912         struct ldlm_bl_thread_data *bltd = arg;
2913         int rc;
2914
2915         ENTRY;
2916
2917         OBD_ALLOC_PTR(env);
2918         if (!env)
2919                 RETURN(-ENOMEM);
2920         rc = lu_env_init(env, LCT_DT_THREAD);
2921         if (rc)
2922                 GOTO(out_env, rc);
2923         rc = lu_env_add(env);
2924         if (rc)
2925                 GOTO(out_env_fini, rc);
2926
2927         blp = bltd->bltd_blp;
2928
2929         complete(&bltd->bltd_comp);
2930         /* cannot use bltd after this, it is only on caller's stack */
2931
2932         while (1) {
2933                 struct ldlm_bl_work_item *blwi = NULL;
2934                 struct obd_export *exp = NULL;
2935                 int rc;
2936
2937                 rc = ldlm_bl_get_work(blp, &blwi, &exp);
2938
2939                 if (rc == 0)
2940                         wait_event_idle_exclusive(blp->blp_waitq,
2941                                                   ldlm_bl_get_work(blp, &blwi,
2942                                                                    &exp));
2943                 atomic_inc(&blp->blp_busy_threads);
2944
2945                 if (ldlm_bl_thread_need_create(blp, blwi))
2946                         /* discard the return value, we tried */
2947                         ldlm_bl_thread_start(blp, true);
2948
2949                 if (exp)
2950                         rc = ldlm_bl_thread_exports(blp, exp);
2951                 else if (blwi)
2952                         rc = ldlm_bl_thread_blwi(blp, blwi);
2953
2954                 atomic_dec(&blp->blp_busy_threads);
2955
2956                 if (rc == LDLM_ITER_STOP)
2957                         break;
2958
2959                 /*
2960                  * If there are many namespaces, we will not sleep waiting for
2961                  * work, and must do a cond_resched to avoid holding the CPU
2962                  * for too long
2963                  */
2964                 cond_resched();
2965         }
2966
2967         atomic_dec(&blp->blp_num_threads);
2968         complete(&blp->blp_comp);
2969
2970         lu_env_remove(env);
2971 out_env_fini:
2972         lu_env_fini(env);
2973 out_env:
2974         OBD_FREE_PTR(env);
2975         RETURN(rc);
2976 }
2977
2978
2979 static int ldlm_setup(void);
2980 static int ldlm_cleanup(void);
2981
2982 int ldlm_get_ref(void)
2983 {
2984         int rc = 0;
2985
2986         ENTRY;
2987         mutex_lock(&ldlm_ref_mutex);
2988         if (++ldlm_refcount == 1) {
2989                 rc = ldlm_setup();
2990                 if (rc)
2991                         ldlm_refcount--;
2992         }
2993         mutex_unlock(&ldlm_ref_mutex);
2994
2995         RETURN(rc);
2996 }
2997
2998 void ldlm_put_ref(void)
2999 {
3000         ENTRY;
3001         mutex_lock(&ldlm_ref_mutex);
3002         if (ldlm_refcount == 1) {
3003                 int rc = ldlm_cleanup();
3004
3005                 if (rc)
3006                         CERROR("ldlm_cleanup failed: %d\n", rc);
3007                 else
3008                         ldlm_refcount--;
3009         } else {
3010                 ldlm_refcount--;
3011         }
3012         mutex_unlock(&ldlm_ref_mutex);
3013
3014         EXIT;
3015 }
3016
3017 /*
3018  * Export handle<->lock hash operations.
3019  */
3020 static unsigned
3021 ldlm_export_lock_hash(struct cfs_hash *hs, const void *key, unsigned int mask)
3022 {
3023         return cfs_hash_u64_hash(((struct lustre_handle *)key)->cookie, mask);
3024 }
3025
3026 static void *
3027 ldlm_export_lock_key(struct hlist_node *hnode)
3028 {
3029         struct ldlm_lock *lock;
3030
3031         lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
3032         return &lock->l_remote_handle;
3033 }
3034
3035 static void
3036 ldlm_export_lock_keycpy(struct hlist_node *hnode, void *key)
3037 {
3038         struct ldlm_lock     *lock;
3039
3040         lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
3041         lock->l_remote_handle = *(struct lustre_handle *)key;
3042 }
3043
3044 static int
3045 ldlm_export_lock_keycmp(const void *key, struct hlist_node *hnode)
3046 {
3047         return lustre_handle_equal(ldlm_export_lock_key(hnode), key);
3048 }
3049
3050 static void *
3051 ldlm_export_lock_object(struct hlist_node *hnode)
3052 {
3053         return hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
3054 }
3055
3056 static void
3057 ldlm_export_lock_get(struct cfs_hash *hs, struct hlist_node *hnode)
3058 {
3059         struct ldlm_lock *lock;
3060
3061         lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
3062         LDLM_LOCK_GET(lock);
3063 }
3064
3065 static void
3066 ldlm_export_lock_put(struct cfs_hash *hs, struct hlist_node *hnode)
3067 {
3068         struct ldlm_lock *lock;
3069
3070         lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
3071         LDLM_LOCK_RELEASE(lock);
3072 }
3073
3074 static struct cfs_hash_ops ldlm_export_lock_ops = {
3075         .hs_hash        = ldlm_export_lock_hash,
3076         .hs_key         = ldlm_export_lock_key,
3077         .hs_keycmp      = ldlm_export_lock_keycmp,
3078         .hs_keycpy      = ldlm_export_lock_keycpy,
3079         .hs_object      = ldlm_export_lock_object,
3080         .hs_get         = ldlm_export_lock_get,
3081         .hs_put         = ldlm_export_lock_put,
3082         .hs_put_locked  = ldlm_export_lock_put,
3083 };
3084
3085 int ldlm_init_export(struct obd_export *exp)
3086 {
3087         int rc;
3088
3089         ENTRY;
3090
3091         exp->exp_lock_hash =
3092                 cfs_hash_create(obd_uuid2str(&exp->exp_client_uuid),
3093                                 HASH_EXP_LOCK_CUR_BITS,
3094                                 HASH_EXP_LOCK_MAX_BITS,
3095                                 HASH_EXP_LOCK_BKT_BITS, 0,
3096                                 CFS_HASH_MIN_THETA, CFS_HASH_MAX_THETA,
3097                                 &ldlm_export_lock_ops,
3098                                 CFS_HASH_DEFAULT | CFS_HASH_REHASH_KEY |
3099                                 CFS_HASH_NBLK_CHANGE);
3100
3101         if (!exp->exp_lock_hash)
3102                 RETURN(-ENOMEM);
3103
3104         rc = ldlm_init_flock_export(exp);
3105         if (rc)
3106                 GOTO(err, rc);
3107
3108         RETURN(0);
3109 err:
3110         ldlm_destroy_export(exp);
3111         RETURN(rc);
3112 }
3113 EXPORT_SYMBOL(ldlm_init_export);
3114
3115 void ldlm_destroy_export(struct obd_export *exp)
3116 {
3117         ENTRY;
3118         cfs_hash_putref(exp->exp_lock_hash);
3119         exp->exp_lock_hash = NULL;
3120
3121         ldlm_destroy_flock_export(exp);
3122         EXIT;
3123 }
3124 EXPORT_SYMBOL(ldlm_destroy_export);
3125
3126 static ssize_t cancel_unused_locks_before_replay_show(struct kobject *kobj,
3127                                                       struct attribute *attr,
3128                                                       char *buf)
3129 {
3130         return sprintf(buf, "%d\n", ldlm_cancel_unused_locks_before_replay);
3131 }
3132
3133 static ssize_t cancel_unused_locks_before_replay_store(struct kobject *kobj,
3134                                                        struct attribute *attr,
3135                                                        const char *buffer,
3136                                                        size_t count)
3137 {
3138         int rc;
3139         unsigned long val;
3140
3141         rc = kstrtoul(buffer, 10, &val);
3142         if (rc)
3143                 return rc;
3144
3145         ldlm_cancel_unused_locks_before_replay = val;
3146
3147         return count;
3148 }
3149 LUSTRE_RW_ATTR(cancel_unused_locks_before_replay);
3150
3151 static struct attribute *ldlm_attrs[] = {
3152         &lustre_attr_cancel_unused_locks_before_replay.attr,
3153         NULL,
3154 };
3155
3156 static struct attribute_group ldlm_attr_group = {
3157         .attrs = ldlm_attrs,
3158 };
3159
3160 static int ldlm_setup(void)
3161 {
3162         static struct ptlrpc_service_conf       conf;
3163         struct ldlm_bl_pool                    *blp = NULL;
3164 #ifdef HAVE_SERVER_SUPPORT
3165         struct task_struct *task;
3166 #endif /* HAVE_SERVER_SUPPORT */
3167         int i;
3168         int rc = 0;
3169
3170         ENTRY;
3171
3172         if (ldlm_state != NULL)
3173                 RETURN(-EALREADY);
3174
3175         OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
3176         if (ldlm_state == NULL)
3177                 RETURN(-ENOMEM);
3178
3179         ldlm_kobj = kobject_create_and_add("ldlm", &lustre_kset->kobj);
3180         if (!ldlm_kobj)
3181                 GOTO(out, -ENOMEM);
3182
3183         rc = sysfs_create_group(ldlm_kobj, &ldlm_attr_group);
3184         if (rc)
3185                 GOTO(out, rc);
3186
3187         ldlm_ns_kset = kset_create_and_add("namespaces", NULL, ldlm_kobj);
3188         if (!ldlm_ns_kset)
3189                 GOTO(out, -ENOMEM);
3190
3191         ldlm_svc_kset = kset_create_and_add("services", NULL, ldlm_kobj);
3192         if (!ldlm_svc_kset)
3193                 GOTO(out, -ENOMEM);
3194
3195         rc = ldlm_debugfs_setup();
3196         if (rc != 0)
3197                 GOTO(out, rc);
3198
3199         memset(&conf, 0, sizeof(conf));
3200         conf = (typeof(conf)) {
3201                 .psc_name               = "ldlm_cbd",
3202                 .psc_watchdog_factor    = 2,
3203                 .psc_buf                = {
3204                         .bc_nbufs               = LDLM_CLIENT_NBUFS,
3205                         .bc_buf_size            = LDLM_BUFSIZE,
3206                         .bc_req_max_size        = LDLM_MAXREQSIZE,
3207                         .bc_rep_max_size        = LDLM_MAXREPSIZE,
3208                         .bc_req_portal          = LDLM_CB_REQUEST_PORTAL,
3209                         .bc_rep_portal          = LDLM_CB_REPLY_PORTAL,
3210                 },
3211                 .psc_thr                = {
3212                         .tc_thr_name            = "ldlm_cb",
3213                         .tc_thr_factor          = LDLM_THR_FACTOR,
3214                         .tc_nthrs_init          = LDLM_NTHRS_INIT,
3215                         .tc_nthrs_base          = LDLM_NTHRS_BASE,
3216                         .tc_nthrs_max           = LDLM_NTHRS_MAX,
3217                         .tc_nthrs_user          = ldlm_num_threads,
3218                         .tc_cpu_bind            = ldlm_cpu_bind,
3219                         .tc_ctx_tags            = LCT_MD_THREAD