4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2010, 2015, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/ldlm/ldlm_lockd.c
38 * Author: Peter Braam <braam@clusterfs.com>
39 * Author: Phil Schwan <phil@clusterfs.com>
42 #define DEBUG_SUBSYSTEM S_LDLM
44 #include <linux/kthread.h>
45 #include <libcfs/libcfs.h>
46 #include <lustre_dlm.h>
47 #include <obd_class.h>
48 #include <libcfs/list.h>
49 #include "ldlm_internal.h"
51 static int ldlm_num_threads;
52 CFS_MODULE_PARM(ldlm_num_threads, "i", int, 0444,
53 "number of DLM service threads to start");
55 static char *ldlm_cpts;
56 CFS_MODULE_PARM(ldlm_cpts, "s", charp, 0444,
57 "CPU partitions ldlm threads should run on");
59 static struct mutex ldlm_ref_mutex;
60 static int ldlm_refcount;
62 struct ldlm_cb_async_args {
63 struct ldlm_cb_set_arg *ca_set_arg;
64 struct ldlm_lock *ca_lock;
69 static struct ldlm_state *ldlm_state;
71 inline cfs_time_t round_timeout(cfs_time_t timeout)
73 return cfs_time_seconds((int)cfs_duration_sec(cfs_time_sub(timeout, 0)) + 1);
76 /* timeout for initial callback (AST) reply (bz10399) */
77 static inline unsigned int ldlm_get_rq_timeout(void)
80 unsigned int timeout = min(ldlm_timeout, obd_timeout / 3);
82 return timeout < 1 ? 1 : timeout;
87 #define ELT_TERMINATE 2
93 * blp_prio_list is used for callbacks that should be handled
94 * as a priority. It is used for LDLM_FL_DISCARD_DATA requests.
97 struct list_head blp_prio_list;
100 * blp_list is used for all other callbacks which are likely
101 * to take longer to process.
103 struct list_head blp_list;
105 wait_queue_head_t blp_waitq;
106 struct completion blp_comp;
107 atomic_t blp_num_threads;
108 atomic_t blp_busy_threads;
113 struct ldlm_bl_work_item {
114 struct list_head blwi_entry;
115 struct ldlm_namespace *blwi_ns;
116 struct ldlm_lock_desc blwi_ld;
117 struct ldlm_lock *blwi_lock;
118 struct list_head blwi_head;
120 struct completion blwi_comp;
121 enum ldlm_cancel_flags blwi_flags;
122 int blwi_mem_pressure;
125 #ifdef HAVE_SERVER_SUPPORT
128 * Protects both waiting_locks_list and expired_lock_thread.
130 static spinlock_t waiting_locks_spinlock; /* BH lock (timer) */
133 * List for contended locks.
135 * As soon as a lock is contended, it gets placed on this list and
136 * expected time to get a response is filled in the lock. A special
137 * thread walks the list looking for locks that should be released and
138 * schedules client evictions for those that have not been released in
141 * All access to it should be under waiting_locks_spinlock.
143 static struct list_head waiting_locks_list;
144 static struct timer_list waiting_locks_timer;
146 static struct expired_lock_thread {
147 wait_queue_head_t elt_waitq;
150 struct list_head elt_expired_locks;
151 } expired_lock_thread;
153 static inline int have_expired_locks(void)
158 spin_lock_bh(&waiting_locks_spinlock);
159 need_to_run = !list_empty(&expired_lock_thread.elt_expired_locks);
160 spin_unlock_bh(&waiting_locks_spinlock);
166 * Check expired lock list for expired locks and time them out.
168 static int expired_lock_main(void *arg)
170 struct list_head *expired = &expired_lock_thread.elt_expired_locks;
171 struct l_wait_info lwi = { 0 };
176 expired_lock_thread.elt_state = ELT_READY;
177 wake_up(&expired_lock_thread.elt_waitq);
180 l_wait_event(expired_lock_thread.elt_waitq,
181 have_expired_locks() ||
182 expired_lock_thread.elt_state == ELT_TERMINATE,
185 spin_lock_bh(&waiting_locks_spinlock);
186 if (expired_lock_thread.elt_dump) {
187 struct libcfs_debug_msg_data msgdata = {
188 .msg_file = __FILE__,
189 .msg_fn = "waiting_locks_callback",
190 .msg_line = expired_lock_thread.elt_dump };
191 spin_unlock_bh(&waiting_locks_spinlock);
193 /* from waiting_locks_callback, but not in timer */
194 libcfs_debug_dumplog();
195 libcfs_run_lbug_upcall(&msgdata);
197 spin_lock_bh(&waiting_locks_spinlock);
198 expired_lock_thread.elt_dump = 0;
203 while (!list_empty(expired)) {
204 struct obd_export *export;
205 struct ldlm_lock *lock;
207 lock = list_entry(expired->next, struct ldlm_lock,
209 if ((void *)lock < LP_POISON + PAGE_CACHE_SIZE &&
210 (void *)lock >= LP_POISON) {
211 spin_unlock_bh(&waiting_locks_spinlock);
212 CERROR("free lock on elt list %p\n", lock);
215 list_del_init(&lock->l_pending_chain);
216 if ((void *)lock->l_export <
217 LP_POISON + PAGE_CACHE_SIZE &&
218 (void *)lock->l_export >= LP_POISON) {
219 CERROR("lock with free export on elt list %p\n",
221 lock->l_export = NULL;
222 LDLM_ERROR(lock, "free export");
223 /* release extra ref grabbed by
224 * ldlm_add_waiting_lock() or
225 * ldlm_failed_ast() */
226 LDLM_LOCK_RELEASE(lock);
230 if (ldlm_is_destroyed(lock)) {
231 /* release the lock refcount where
232 * waiting_locks_callback() founds */
233 LDLM_LOCK_RELEASE(lock);
236 export = class_export_lock_get(lock->l_export, lock);
237 spin_unlock_bh(&waiting_locks_spinlock);
239 spin_lock_bh(&export->exp_bl_list_lock);
240 list_del_init(&lock->l_exp_list);
241 spin_unlock_bh(&export->exp_bl_list_lock);
244 class_fail_export(export);
245 class_export_lock_put(export, lock);
247 /* release extra ref grabbed by ldlm_add_waiting_lock()
248 * or ldlm_failed_ast() */
249 LDLM_LOCK_RELEASE(lock);
251 spin_lock_bh(&waiting_locks_spinlock);
253 spin_unlock_bh(&waiting_locks_spinlock);
255 if (do_dump && obd_dump_on_eviction) {
256 CERROR("dump the log upon eviction\n");
257 libcfs_debug_dumplog();
260 if (expired_lock_thread.elt_state == ELT_TERMINATE)
264 expired_lock_thread.elt_state = ELT_STOPPED;
265 wake_up(&expired_lock_thread.elt_waitq);
269 static int ldlm_add_waiting_lock(struct ldlm_lock *lock);
270 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, int seconds);
273 * Check if there is a request in the export request list
274 * which prevents the lock canceling.
276 static int ldlm_lock_busy(struct ldlm_lock *lock)
278 struct ptlrpc_request *req;
282 if (lock->l_export == NULL)
285 spin_lock_bh(&lock->l_export->exp_rpc_lock);
286 list_for_each_entry(req, &lock->l_export->exp_hp_rpcs,
288 if (req->rq_ops->hpreq_lock_match) {
289 match = req->rq_ops->hpreq_lock_match(req, lock);
294 spin_unlock_bh(&lock->l_export->exp_rpc_lock);
298 /* This is called from within a timer interrupt and cannot schedule */
299 static void waiting_locks_callback(unsigned long unused)
301 struct ldlm_lock *lock;
304 spin_lock_bh(&waiting_locks_spinlock);
305 while (!list_empty(&waiting_locks_list)) {
306 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
308 if (cfs_time_after(lock->l_callback_timeout,
309 cfs_time_current()) ||
310 (lock->l_req_mode == LCK_GROUP))
313 /* Check if we need to prolong timeout */
314 if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT) &&
315 ldlm_lock_busy(lock)) {
318 if (lock->l_pending_chain.next == &waiting_locks_list)
323 spin_unlock_bh(&waiting_locks_spinlock);
324 LDLM_DEBUG(lock, "prolong the busy lock");
325 ldlm_refresh_waiting_lock(lock,
326 ldlm_bl_timeout(lock) >> 1);
327 spin_lock_bh(&waiting_locks_spinlock);
330 LDLM_LOCK_RELEASE(lock);
334 LDLM_LOCK_RELEASE(lock);
337 ldlm_lock_to_ns(lock)->ns_timeouts++;
338 LDLM_ERROR(lock, "lock callback timer expired after %lds: "
339 "evicting client at %s ",
340 cfs_time_current_sec() - lock->l_last_activity,
342 lock->l_export->exp_connection->c_peer.nid));
344 /* no needs to take an extra ref on the lock since it was in
345 * the waiting_locks_list and ldlm_add_waiting_lock()
346 * already grabbed a ref */
347 list_del(&lock->l_pending_chain);
348 list_add(&lock->l_pending_chain,
349 &expired_lock_thread.elt_expired_locks);
353 if (!list_empty(&expired_lock_thread.elt_expired_locks)) {
354 if (obd_dump_on_timeout && need_dump)
355 expired_lock_thread.elt_dump = __LINE__;
357 wake_up(&expired_lock_thread.elt_waitq);
361 * Make sure the timer will fire again if we have any locks
364 if (!list_empty(&waiting_locks_list)) {
365 cfs_time_t timeout_rounded;
366 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
368 timeout_rounded = (cfs_time_t)round_timeout(lock->l_callback_timeout);
369 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
371 spin_unlock_bh(&waiting_locks_spinlock);
375 * Add lock to the list of contended locks.
377 * Indicate that we're waiting for a client to call us back cancelling a given
378 * lock. We add it to the pending-callback chain, and schedule the lock-timeout
379 * timer to fire appropriately. (We round up to the next second, to avoid
380 * floods of timer firings during periods of high lock contention and traffic).
381 * As done by ldlm_add_waiting_lock(), the caller must grab a lock reference
382 * if it has been added to the waiting list (1 is returned).
384 * Called with the namespace lock held.
386 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, int seconds)
389 cfs_time_t timeout_rounded;
391 if (!list_empty(&lock->l_pending_chain))
394 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT) ||
395 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
398 timeout = cfs_time_shift(seconds);
399 if (likely(cfs_time_after(timeout, lock->l_callback_timeout)))
400 lock->l_callback_timeout = timeout;
402 timeout_rounded = round_timeout(lock->l_callback_timeout);
404 if (cfs_time_before(timeout_rounded,
405 cfs_timer_deadline(&waiting_locks_timer)) ||
406 !cfs_timer_is_armed(&waiting_locks_timer)) {
407 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
409 /* if the new lock has a shorter timeout than something earlier on
410 the list, we'll wait the longer amount of time; no big deal. */
412 list_add_tail(&lock->l_pending_chain, &waiting_locks_list);
416 static void ldlm_add_blocked_lock(struct ldlm_lock *lock)
418 spin_lock_bh(&lock->l_export->exp_bl_list_lock);
419 if (list_empty(&lock->l_exp_list)) {
420 if (lock->l_granted_mode != lock->l_req_mode)
421 list_add_tail(&lock->l_exp_list,
422 &lock->l_export->exp_bl_list);
424 list_add(&lock->l_exp_list,
425 &lock->l_export->exp_bl_list);
427 spin_unlock_bh(&lock->l_export->exp_bl_list_lock);
429 /* A blocked lock is added. Adjust the position in
430 * the stale list if the export is in the list.
431 * If export is stale and not in the list - it is being
432 * processed and will be placed on the right position
433 * on obd_stale_export_put(). */
434 if (!list_empty(&lock->l_export->exp_stale_list))
435 obd_stale_export_adjust(lock->l_export);
438 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
441 int timeout = ldlm_bl_timeout(lock);
443 /* NB: must be called with hold of lock_res_and_lock() */
444 LASSERT(ldlm_is_res_locked(lock));
445 LASSERT(!ldlm_is_cancel_on_block(lock));
447 /* Do not put cross-MDT lock in the waiting list, since we
448 * will not evict it due to timeout for now */
449 if (lock->l_export != NULL &&
450 (exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS))
453 spin_lock_bh(&waiting_locks_spinlock);
454 if (ldlm_is_cancel(lock)) {
455 spin_unlock_bh(&waiting_locks_spinlock);
459 if (ldlm_is_destroyed(lock)) {
460 static cfs_time_t next;
462 spin_unlock_bh(&waiting_locks_spinlock);
463 LDLM_ERROR(lock, "not waiting on destroyed lock (bug 5653)");
464 if (cfs_time_after(cfs_time_current(), next)) {
465 next = cfs_time_shift(14400);
466 libcfs_debug_dumpstack(NULL);
471 ldlm_set_waited(lock);
472 lock->l_last_activity = cfs_time_current_sec();
473 ret = __ldlm_add_waiting_lock(lock, timeout);
475 /* grab ref on the lock if it has been added to the
479 spin_unlock_bh(&waiting_locks_spinlock);
482 ldlm_add_blocked_lock(lock);
484 LDLM_DEBUG(lock, "%sadding to wait list(timeout: %d, AT: %s)",
485 ret == 0 ? "not re-" : "", timeout,
486 AT_OFF ? "off" : "on");
491 * Remove a lock from the pending list, likely because it had its cancellation
492 * callback arrive without incident. This adjusts the lock-timeout timer if
493 * needed. Returns 0 if the lock wasn't pending after all, 1 if it was.
494 * As done by ldlm_del_waiting_lock(), the caller must release the lock
495 * reference when the lock is removed from any list (1 is returned).
497 * Called with namespace lock held.
499 static int __ldlm_del_waiting_lock(struct ldlm_lock *lock)
501 struct list_head *list_next;
503 if (list_empty(&lock->l_pending_chain))
506 list_next = lock->l_pending_chain.next;
507 if (lock->l_pending_chain.prev == &waiting_locks_list) {
508 /* Removing the head of the list, adjust timer. */
509 if (list_next == &waiting_locks_list) {
510 /* No more, just cancel. */
511 cfs_timer_disarm(&waiting_locks_timer);
513 struct ldlm_lock *next;
514 next = list_entry(list_next, struct ldlm_lock,
516 cfs_timer_arm(&waiting_locks_timer,
517 round_timeout(next->l_callback_timeout));
520 list_del_init(&lock->l_pending_chain);
525 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
529 if (lock->l_export == NULL) {
530 /* We don't have a "waiting locks list" on clients. */
531 CDEBUG(D_DLMTRACE, "Client lock %p : no-op\n", lock);
535 spin_lock_bh(&waiting_locks_spinlock);
536 ret = __ldlm_del_waiting_lock(lock);
537 ldlm_clear_waited(lock);
538 spin_unlock_bh(&waiting_locks_spinlock);
540 /* remove the lock out of export blocking list */
541 spin_lock_bh(&lock->l_export->exp_bl_list_lock);
542 list_del_init(&lock->l_exp_list);
543 spin_unlock_bh(&lock->l_export->exp_bl_list_lock);
546 /* release lock ref if it has indeed been removed
548 LDLM_LOCK_RELEASE(lock);
551 LDLM_DEBUG(lock, "%s", ret == 0 ? "wasn't waiting" : "removed");
556 * Prolong the contended lock waiting time.
558 * Called with namespace lock held.
560 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout)
562 if (lock->l_export == NULL) {
563 /* We don't have a "waiting locks list" on clients. */
564 LDLM_DEBUG(lock, "client lock: no-op");
568 if (exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS) {
569 /* We don't have a "waiting locks list" on OSP. */
570 LDLM_DEBUG(lock, "MDS-MDS lock: no-op");
574 spin_lock_bh(&waiting_locks_spinlock);
576 if (list_empty(&lock->l_pending_chain)) {
577 spin_unlock_bh(&waiting_locks_spinlock);
578 LDLM_DEBUG(lock, "wasn't waiting");
582 /* we remove/add the lock to the waiting list, so no needs to
583 * release/take a lock reference */
584 __ldlm_del_waiting_lock(lock);
585 __ldlm_add_waiting_lock(lock, timeout);
586 spin_unlock_bh(&waiting_locks_spinlock);
588 LDLM_DEBUG(lock, "refreshed");
591 EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
593 #else /* HAVE_SERVER_SUPPORT */
595 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
600 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout)
605 #endif /* !HAVE_SERVER_SUPPORT */
607 #ifdef HAVE_SERVER_SUPPORT
610 * Calculate the per-export Blocking timeout (covering BL AST, data flush,
611 * lock cancel, and their replies). Used for lock callback timeout and AST
614 * \param[in] lock lock which is getting the blocking callback
616 * \retval timeout in seconds to wait for the client reply
618 unsigned int ldlm_bl_timeout(struct ldlm_lock *lock)
620 unsigned int timeout;
623 return obd_timeout / 2;
625 /* Since these are non-updating timeouts, we should be conservative.
626 * Take more than usually, 150%
627 * It would be nice to have some kind of "early reply" mechanism for
628 * lock callbacks too... */
629 timeout = at_get(&lock->l_export->exp_bl_lock_at);
630 return max(timeout + (timeout >> 1), ldlm_enqueue_min);
632 EXPORT_SYMBOL(ldlm_bl_timeout);
635 * Perform lock cleanup if AST sending failed.
637 static void ldlm_failed_ast(struct ldlm_lock *lock, int rc,
638 const char *ast_type)
640 LCONSOLE_ERROR_MSG(0x138, "%s: A client on nid %s was evicted due "
641 "to a lock %s callback time out: rc %d\n",
642 lock->l_export->exp_obd->obd_name,
643 obd_export_nid2str(lock->l_export), ast_type, rc);
645 if (obd_dump_on_timeout)
646 libcfs_debug_dumplog();
647 spin_lock_bh(&waiting_locks_spinlock);
648 if (__ldlm_del_waiting_lock(lock) == 0)
649 /* the lock was not in any list, grab an extra ref before adding
650 * the lock to the expired list */
652 list_add(&lock->l_pending_chain,
653 &expired_lock_thread.elt_expired_locks);
654 wake_up(&expired_lock_thread.elt_waitq);
655 spin_unlock_bh(&waiting_locks_spinlock);
659 * Perform lock cleanup if AST reply came with error.
661 static int ldlm_handle_ast_error(struct ldlm_lock *lock,
662 struct ptlrpc_request *req, int rc,
663 const char *ast_type)
665 lnet_process_id_t peer = req->rq_import->imp_connection->c_peer;
667 if (!req->rq_replied || (rc && rc != -EINVAL)) {
668 if (lock->l_export && lock->l_export->exp_libclient) {
669 LDLM_DEBUG(lock, "%s AST to liblustre client (nid %s)"
670 " timeout, just cancelling lock", ast_type,
671 libcfs_nid2str(peer.nid));
672 ldlm_lock_cancel(lock);
674 } else if (ldlm_is_cancel(lock)) {
675 LDLM_DEBUG(lock, "%s AST timeout from nid %s, but "
676 "cancel was received (AST reply lost?)",
677 ast_type, libcfs_nid2str(peer.nid));
678 ldlm_lock_cancel(lock);
681 LDLM_ERROR(lock, "client (nid %s) %s %s AST "
682 "(req status %d rc %d), evict it",
683 libcfs_nid2str(peer.nid),
684 req->rq_replied ? "returned error from" :
685 "failed to reply to",
687 (req->rq_repmsg != NULL) ?
688 lustre_msg_get_status(req->rq_repmsg) : 0,
690 ldlm_failed_ast(lock, rc, ast_type);
696 struct ldlm_resource *res = lock->l_resource;
698 LDLM_DEBUG(lock, "client (nid %s) returned %d"
699 " from %s AST - normal race",
700 libcfs_nid2str(peer.nid),
702 lustre_msg_get_status(req->rq_repmsg) : -1,
705 /* update lvbo to return proper attributes.
707 ldlm_resource_getref(res);
708 ldlm_res_lvbo_update(res, NULL, 1);
709 ldlm_resource_putref(res);
711 ldlm_lock_cancel(lock);
718 static int ldlm_cb_interpret(const struct lu_env *env,
719 struct ptlrpc_request *req, void *data, int rc)
721 struct ldlm_cb_async_args *ca = data;
722 struct ldlm_lock *lock = ca->ca_lock;
723 struct ldlm_cb_set_arg *arg = ca->ca_set_arg;
726 LASSERT(lock != NULL);
729 case LDLM_GL_CALLBACK:
730 /* Update the LVB from disk if the AST failed
731 * (this is a legal race)
733 * - Glimpse callback of local lock just returns
734 * -ELDLM_NO_LOCK_DATA.
735 * - Glimpse callback of remote lock might return
736 * -ELDLM_NO_LOCK_DATA when inode is cleared. LU-274
738 if (rc == -ELDLM_NO_LOCK_DATA) {
739 LDLM_DEBUG(lock, "lost race - client has a lock but no "
741 ldlm_res_lvbo_update(lock->l_resource, NULL, 1);
742 } else if (rc != 0) {
743 rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
745 rc = ldlm_res_lvbo_update(lock->l_resource, req, 1);
748 case LDLM_BL_CALLBACK:
750 rc = ldlm_handle_ast_error(lock, req, rc, "blocking");
752 case LDLM_CP_CALLBACK:
754 rc = ldlm_handle_ast_error(lock, req, rc, "completion");
757 LDLM_ERROR(lock, "invalid opcode for lock callback %d",
762 /* release extra reference taken in ldlm_ast_fini() */
763 LDLM_LOCK_RELEASE(lock);
766 atomic_inc(&arg->restart);
771 static void ldlm_update_resend(struct ptlrpc_request *req, void *data)
773 struct ldlm_cb_async_args *ca = data;
774 struct ldlm_lock *lock = ca->ca_lock;
776 ldlm_refresh_waiting_lock(lock, ldlm_bl_timeout(lock));
779 static inline int ldlm_ast_fini(struct ptlrpc_request *req,
780 struct ldlm_cb_set_arg *arg,
781 struct ldlm_lock *lock,
787 if (unlikely(instant_cancel)) {
788 rc = ptl_send_rpc(req, 1);
789 ptlrpc_req_finished(req);
791 atomic_inc(&arg->restart);
794 ptlrpc_set_add_req(arg->set, req);
801 * Check if there are requests in the export request list which prevent
802 * the lock canceling and make these requests high priority ones.
804 static void ldlm_lock_reorder_req(struct ldlm_lock *lock)
806 struct ptlrpc_request *req;
809 if (lock->l_export == NULL) {
810 LDLM_DEBUG(lock, "client lock: no-op");
814 spin_lock_bh(&lock->l_export->exp_rpc_lock);
815 list_for_each_entry(req, &lock->l_export->exp_hp_rpcs,
817 /* Do not process requests that were not yet added to there
818 * incoming queue or were already removed from there for
819 * processing. We evaluate ptlrpc_nrs_req_can_move() without
820 * holding svcpt->scp_req_lock, and then redo the check with
821 * the lock held once we need to obtain a reliable result.
823 if (ptlrpc_nrs_req_can_move(req) &&
824 req->rq_ops->hpreq_lock_match &&
825 req->rq_ops->hpreq_lock_match(req, lock))
826 ptlrpc_nrs_req_hp_move(req);
828 spin_unlock_bh(&lock->l_export->exp_rpc_lock);
833 * ->l_blocking_ast() method for server-side locks. This is invoked when newly
834 * enqueued server lock conflicts with given one.
836 * Sends blocking AST RPC to the client owning that lock; arms timeout timer
837 * to wait for client response.
839 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
840 struct ldlm_lock_desc *desc,
841 void *data, int flag)
843 struct ldlm_cb_async_args *ca;
844 struct ldlm_cb_set_arg *arg = data;
845 struct ldlm_request *body;
846 struct ptlrpc_request *req;
847 int instant_cancel = 0;
851 if (flag == LDLM_CB_CANCELING)
852 /* Don't need to do anything here. */
856 LASSERT(data != NULL);
857 if (lock->l_export->exp_obd->obd_recovering != 0)
858 LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
860 ldlm_lock_reorder_req(lock);
862 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
863 &RQF_LDLM_BL_CALLBACK,
864 LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK);
868 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
869 ca = ptlrpc_req_async_args(req);
870 ca->ca_set_arg = arg;
873 req->rq_interpret_reply = ldlm_cb_interpret;
875 lock_res_and_lock(lock);
876 if (ldlm_is_destroyed(lock)) {
877 /* What's the point? */
878 unlock_res_and_lock(lock);
879 ptlrpc_req_finished(req);
883 if (lock->l_granted_mode != lock->l_req_mode) {
884 /* this blocking AST will be communicated as part of the
885 * completion AST instead */
886 ldlm_add_blocked_lock(lock);
887 ldlm_set_waited(lock);
888 unlock_res_and_lock(lock);
890 ptlrpc_req_finished(req);
891 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
895 if (ldlm_is_cancel_on_block(lock))
898 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
899 body->lock_handle[0] = lock->l_remote_handle;
900 body->lock_desc = *desc;
901 body->lock_flags |= ldlm_flags_to_wire(lock->l_flags & LDLM_FL_AST_MASK);
903 LDLM_DEBUG(lock, "server preparing blocking AST");
905 ptlrpc_request_set_replen(req);
906 if (instant_cancel) {
907 unlock_res_and_lock(lock);
908 ldlm_lock_cancel(lock);
910 req->rq_no_resend = 1;
912 LASSERT(lock->l_granted_mode == lock->l_req_mode);
913 ldlm_add_waiting_lock(lock);
914 unlock_res_and_lock(lock);
916 /* Do not resend after lock callback timeout */
917 req->rq_delay_limit = ldlm_bl_timeout(lock);
918 req->rq_resend_cb = ldlm_update_resend;
921 req->rq_send_state = LUSTRE_IMP_FULL;
922 /* ptlrpc_request_alloc_pack already set timeout */
924 req->rq_timeout = ldlm_get_rq_timeout();
926 lock->l_last_activity = cfs_time_current_sec();
928 if (lock->l_export && lock->l_export->exp_nid_stats &&
929 lock->l_export->exp_nid_stats->nid_ldlm_stats)
930 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
931 LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
933 rc = ldlm_ast_fini(req, arg, lock, instant_cancel);
939 * ->l_completion_ast callback for a remote lock in server namespace.
941 * Sends AST to the client notifying it of lock granting. If initial
942 * lock response was not sent yet, instead of sending another RPC, just
943 * mark the lock as granted and client will understand
945 int ldlm_server_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data)
947 struct ldlm_cb_set_arg *arg = data;
948 struct ldlm_request *body;
949 struct ptlrpc_request *req;
950 struct ldlm_cb_async_args *ca;
951 int instant_cancel = 0;
956 LASSERT(lock != NULL);
957 LASSERT(data != NULL);
959 if (OBD_FAIL_PRECHECK(OBD_FAIL_LDLM_SRV_CP_AST)) {
960 LDLM_DEBUG(lock, "dropping CP AST");
964 req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse,
965 &RQF_LDLM_CP_CALLBACK);
969 /* server namespace, doesn't need lock */
970 lvb_len = ldlm_lvbo_size(lock);
971 /* LU-3124 & LU-2187: to not return layout in completion AST because
972 * it may deadlock for LU-2187, or client may not have enough space
973 * for large layout. The layout will be returned to client with an
974 * extra RPC to fetch xattr.lov */
975 if (ldlm_has_layout(lock))
978 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT, lvb_len);
979 rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK);
981 ptlrpc_request_free(req);
985 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
986 ca = ptlrpc_req_async_args(req);
987 ca->ca_set_arg = arg;
990 req->rq_interpret_reply = ldlm_cb_interpret;
991 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
993 body->lock_handle[0] = lock->l_remote_handle;
994 body->lock_flags = ldlm_flags_to_wire(flags);
995 ldlm_lock2desc(lock, &body->lock_desc);
997 void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB);
999 lvb_len = ldlm_lvbo_fill(lock, lvb, lvb_len);
1001 /* We still need to send the RPC to wake up the blocked
1002 * enqueue thread on the client.
1004 * Consider old client, there is no better way to notify
1005 * the failure, just zero-sized the LVB, then the client
1006 * will fail out as "-EPROTO". */
1007 req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, 0,
1011 req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, lvb_len,
1016 lock->l_last_activity = cfs_time_current_sec();
1018 LDLM_DEBUG(lock, "server preparing completion AST");
1020 ptlrpc_request_set_replen(req);
1022 req->rq_send_state = LUSTRE_IMP_FULL;
1023 /* ptlrpc_request_pack already set timeout */
1025 req->rq_timeout = ldlm_get_rq_timeout();
1027 /* We only send real blocking ASTs after the lock is granted */
1028 lock_res_and_lock(lock);
1029 if (ldlm_is_ast_sent(lock)) {
1030 body->lock_flags |= ldlm_flags_to_wire(LDLM_FL_AST_SENT);
1031 /* Copy AST flags like LDLM_FL_DISCARD_DATA. */
1032 body->lock_flags |= ldlm_flags_to_wire(lock->l_flags &
1035 /* We might get here prior to ldlm_handle_enqueue setting
1036 * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
1037 * into waiting list, but this is safe and similar code in
1038 * ldlm_handle_enqueue will call ldlm_lock_cancel() still,
1039 * that would not only cancel the lock, but will also remove
1040 * it from waiting list */
1041 if (ldlm_is_cancel_on_block(lock)) {
1042 unlock_res_and_lock(lock);
1043 ldlm_lock_cancel(lock);
1046 req->rq_no_resend = 1;
1048 lock_res_and_lock(lock);
1050 /* start the lock-timeout clock */
1051 ldlm_add_waiting_lock(lock);
1052 /* Do not resend after lock callback timeout */
1053 req->rq_delay_limit = ldlm_bl_timeout(lock);
1054 req->rq_resend_cb = ldlm_update_resend;
1057 unlock_res_and_lock(lock);
1059 if (lock->l_export && lock->l_export->exp_nid_stats &&
1060 lock->l_export->exp_nid_stats->nid_ldlm_stats)
1061 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
1062 LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
1064 rc = ldlm_ast_fini(req, arg, lock, instant_cancel);
1066 RETURN(lvb_len < 0 ? lvb_len : rc);
1070 * Server side ->l_glimpse_ast handler for client locks.
1072 * Sends glimpse AST to the client and waits for reply. Then updates
1073 * lvbo with the result.
1075 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
1077 struct ldlm_cb_set_arg *arg = data;
1078 struct ldlm_request *body;
1079 struct ptlrpc_request *req;
1080 struct ldlm_cb_async_args *ca;
1082 struct req_format *req_fmt;
1085 LASSERT(lock != NULL);
1087 if (arg->gl_desc != NULL)
1088 /* There is a glimpse descriptor to pack */
1089 req_fmt = &RQF_LDLM_GL_DESC_CALLBACK;
1091 req_fmt = &RQF_LDLM_GL_CALLBACK;
1093 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
1094 req_fmt, LUSTRE_DLM_VERSION,
1100 if (arg->gl_desc != NULL) {
1101 /* copy the GL descriptor */
1102 union ldlm_gl_desc *desc;
1103 desc = req_capsule_client_get(&req->rq_pill, &RMF_DLM_GL_DESC);
1104 *desc = *arg->gl_desc;
1107 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1108 body->lock_handle[0] = lock->l_remote_handle;
1109 ldlm_lock2desc(lock, &body->lock_desc);
1111 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
1112 ca = ptlrpc_req_async_args(req);
1113 ca->ca_set_arg = arg;
1116 /* server namespace, doesn't need lock */
1117 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
1118 ldlm_lvbo_size(lock));
1119 ptlrpc_request_set_replen(req);
1121 req->rq_send_state = LUSTRE_IMP_FULL;
1122 /* ptlrpc_request_alloc_pack already set timeout */
1124 req->rq_timeout = ldlm_get_rq_timeout();
1126 lock->l_last_activity = cfs_time_current_sec();
1128 req->rq_interpret_reply = ldlm_cb_interpret;
1130 if (lock->l_export && lock->l_export->exp_nid_stats &&
1131 lock->l_export->exp_nid_stats->nid_ldlm_stats)
1132 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
1133 LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
1135 rc = ldlm_ast_fini(req, arg, lock, 0);
1140 int ldlm_glimpse_locks(struct ldlm_resource *res,
1141 struct list_head *gl_work_list)
1146 rc = ldlm_run_ast_work(ldlm_res_to_ns(res), gl_work_list,
1148 if (rc == -ERESTART)
1149 ldlm_reprocess_all(res);
1153 EXPORT_SYMBOL(ldlm_glimpse_locks);
1155 /* return LDLM lock associated with a lock callback request */
1156 struct ldlm_lock *ldlm_request_lock(struct ptlrpc_request *req)
1158 struct ldlm_cb_async_args *ca;
1159 struct ldlm_lock *lock;
1162 ca = ptlrpc_req_async_args(req);
1165 RETURN(ERR_PTR(-EFAULT));
1169 EXPORT_SYMBOL(ldlm_request_lock);
1171 static void ldlm_svc_get_eopc(const struct ldlm_request *dlm_req,
1172 struct lprocfs_stats *srv_stats)
1174 int lock_type = 0, op = 0;
1176 lock_type = dlm_req->lock_desc.l_resource.lr_type;
1178 switch (lock_type) {
1180 op = PTLRPC_LAST_CNTR + LDLM_PLAIN_ENQUEUE;
1183 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT)
1184 op = PTLRPC_LAST_CNTR + LDLM_GLIMPSE_ENQUEUE;
1186 op = PTLRPC_LAST_CNTR + LDLM_EXTENT_ENQUEUE;
1189 op = PTLRPC_LAST_CNTR + LDLM_FLOCK_ENQUEUE;
1192 op = PTLRPC_LAST_CNTR + LDLM_IBITS_ENQUEUE;
1200 lprocfs_counter_incr(srv_stats, op);
1206 * Main server-side entry point into LDLM for enqueue. This is called by ptlrpc
1207 * service threads to carry out client lock enqueueing requests.
1209 int ldlm_handle_enqueue0(struct ldlm_namespace *ns,
1210 struct ptlrpc_request *req,
1211 const struct ldlm_request *dlm_req,
1212 const struct ldlm_callback_suite *cbs)
1214 struct ldlm_reply *dlm_rep;
1216 enum ldlm_error err = ELDLM_OK;
1217 struct ldlm_lock *lock = NULL;
1218 void *cookie = NULL;
1220 struct ldlm_resource *res = NULL;
1223 LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
1225 ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF, LATF_SKIP);
1226 flags = ldlm_flags_from_wire(dlm_req->lock_flags);
1228 LASSERT(req->rq_export);
1230 if (ptlrpc_req2svc(req)->srv_stats != NULL)
1231 ldlm_svc_get_eopc(dlm_req, ptlrpc_req2svc(req)->srv_stats);
1233 if (req->rq_export && req->rq_export->exp_nid_stats &&
1234 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1235 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1236 LDLM_ENQUEUE - LDLM_FIRST_OPC);
1238 if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE ||
1239 dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) {
1240 DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
1241 dlm_req->lock_desc.l_resource.lr_type);
1242 GOTO(out, rc = -EFAULT);
1245 if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE ||
1246 dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE ||
1247 dlm_req->lock_desc.l_req_mode &
1248 (dlm_req->lock_desc.l_req_mode-1))) {
1249 DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
1250 dlm_req->lock_desc.l_req_mode);
1251 GOTO(out, rc = -EFAULT);
1254 if (exp_connect_flags(req->rq_export) & OBD_CONNECT_IBITS) {
1255 if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1257 DEBUG_REQ(D_ERROR, req,
1258 "PLAIN lock request from IBITS client?");
1259 GOTO(out, rc = -EPROTO);
1261 } else if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1263 DEBUG_REQ(D_ERROR, req,
1264 "IBITS lock request from unaware client?");
1265 GOTO(out, rc = -EPROTO);
1269 /* FIXME this makes it impossible to use LDLM_PLAIN locks -- check
1270 against server's _CONNECT_SUPPORTED flags? (I don't want to use
1271 ibits for mgc/mgs) */
1273 /* INODEBITS_INTEROP: Perform conversion from plain lock to
1274 * inodebits lock if client does not support them. */
1275 if (!(exp_connect_flags(req->rq_export) & OBD_CONNECT_IBITS) &&
1276 (dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN)) {
1277 dlm_req->lock_desc.l_resource.lr_type = LDLM_IBITS;
1278 dlm_req->lock_desc.l_policy_data.l_inodebits.bits =
1279 MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE;
1280 if (dlm_req->lock_desc.l_req_mode == LCK_PR)
1281 dlm_req->lock_desc.l_req_mode = LCK_CR;
1285 if (unlikely((flags & LDLM_FL_REPLAY) ||
1286 (lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))) {
1287 /* Find an existing lock in the per-export lock hash */
1288 /* In the function below, .hs_keycmp resolves to
1289 * ldlm_export_lock_keycmp() */
1290 /* coverity[overrun-buffer-val] */
1291 lock = cfs_hash_lookup(req->rq_export->exp_lock_hash,
1292 (void *)&dlm_req->lock_handle[0]);
1294 DEBUG_REQ(D_DLMTRACE, req, "found existing lock cookie "
1295 LPX64, lock->l_handle.h_cookie);
1296 flags |= LDLM_FL_RESENT;
1297 GOTO(existing_lock, rc = 0);
1300 if (ldlm_reclaim_full()) {
1301 DEBUG_REQ(D_DLMTRACE, req, "Too many granted locks, "
1302 "reject current enqueue request and let the "
1303 "client retry later.\n");
1304 GOTO(out, rc = -EINPROGRESS);
1308 /* The lock's callback data might be set in the policy function */
1309 lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
1310 dlm_req->lock_desc.l_resource.lr_type,
1311 dlm_req->lock_desc.l_req_mode,
1312 cbs, NULL, 0, LVB_T_NONE);
1319 lock->l_remote_handle = dlm_req->lock_handle[0];
1320 LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
1322 /* Initialize resource lvb but not for a lock being replayed since
1323 * Client already got lvb sent in this case.
1324 * This must occur early since some policy methods assume resource
1325 * lvb is available (lr_lvb_data != NULL).
1327 res = lock->l_resource;
1328 if (!(flags & LDLM_FL_REPLAY)) {
1329 /* non-replayed lock, delayed lvb init may need to be done */
1330 rc = ldlm_lvbo_init(res);
1332 LDLM_DEBUG(lock, "delayed lvb init failed (rc %d)", rc);
1337 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
1338 /* Don't enqueue a lock onto the export if it is been disonnected
1339 * due to eviction (bug 3822) or server umount (bug 24324).
1340 * Cancel it now instead. */
1341 if (req->rq_export->exp_disconnected) {
1342 LDLM_ERROR(lock, "lock on disconnected export %p",
1344 GOTO(out, rc = -ENOTCONN);
1347 lock->l_export = class_export_lock_get(req->rq_export, lock);
1348 if (lock->l_export->exp_lock_hash)
1349 cfs_hash_add(lock->l_export->exp_lock_hash,
1350 &lock->l_remote_handle,
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
1356 lock->l_flags |= ldlm_flags_from_wire(dlm_req->lock_flags &
1357 LDLM_FL_INHERIT_MASK);
1360 if (flags & LDLM_FL_HAS_INTENT) {
1361 /* In this case, the reply buffer is allocated deep in
1362 * local_lock_enqueue by the policy function. */
1365 /* based on the assumption that lvb size never changes during
1366 * resource life time otherwise it need resource->lr_lock's
1368 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
1369 RCL_SERVER, ldlm_lvbo_size(lock));
1371 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
1372 GOTO(out, rc = -ENOMEM);
1374 rc = req_capsule_server_pack(&req->rq_pill);
1379 if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN)
1380 ldlm_convert_policy_to_local(req->rq_export,
1381 dlm_req->lock_desc.l_resource.lr_type,
1382 &dlm_req->lock_desc.l_policy_data,
1383 &lock->l_policy_data);
1384 if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
1385 lock->l_req_extent = lock->l_policy_data.l_extent;
1387 err = ldlm_lock_enqueue(ns, &lock, cookie, &flags);
1394 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1396 ldlm_lock2desc(lock, &dlm_rep->lock_desc);
1397 ldlm_lock2handle(lock, &dlm_rep->lock_handle);
1399 if (lock && lock->l_resource->lr_type == LDLM_EXTENT)
1400 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_BL_EVICT, 6);
1402 /* We never send a blocking AST until the lock is granted, but
1403 * we can tell it right now */
1404 lock_res_and_lock(lock);
1406 /* Now take into account flags to be inherited from original lock
1407 request both in reply to client and in our own lock flags. */
1408 dlm_rep->lock_flags = ldlm_flags_to_wire(flags);
1409 lock->l_flags |= flags & LDLM_FL_INHERIT_MASK;
1411 /* Don't move a pending lock onto the export if it has already been
1412 * disconnected due to eviction (bug 5683) or server umount (bug 24324).
1413 * Cancel it now instead. */
1414 if (unlikely(req->rq_export->exp_disconnected ||
1415 OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
1416 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1418 } else if (ldlm_is_ast_sent(lock)) {
1419 dlm_rep->lock_flags |= ldlm_flags_to_wire(LDLM_FL_AST_SENT);
1420 if (lock->l_granted_mode == lock->l_req_mode) {
1422 * Only cancel lock if it was granted, because it would
1423 * be destroyed immediately and would never be granted
1424 * in the future, causing timeouts on client. Not
1425 * granted lock will be cancelled immediately after
1426 * sending completion AST.
1428 if (dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1429 unlock_res_and_lock(lock);
1430 ldlm_lock_cancel(lock);
1431 lock_res_and_lock(lock);
1433 ldlm_add_waiting_lock(lock);
1436 /* Make sure we never ever grant usual metadata locks to liblustre
1438 if ((dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN ||
1439 dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) &&
1440 req->rq_export->exp_libclient) {
1441 if (unlikely(!ldlm_is_cancel_on_block(lock) ||
1442 !(dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK))){
1443 CERROR("Granting sync lock to libclient. "
1444 "req fl %d, rep fl %d, lock fl "LPX64"\n",
1445 dlm_req->lock_flags, dlm_rep->lock_flags,
1447 LDLM_ERROR(lock, "sync lock");
1448 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT) {
1449 struct ldlm_intent *it;
1451 it = req_capsule_client_get(&req->rq_pill,
1454 CERROR("This is intent %s ("LPU64")\n",
1455 ldlm_it2str(it->opc), it->opc);
1461 unlock_res_and_lock(lock);
1465 req->rq_status = rc ?: err; /* return either error - bug 11190 */
1466 if (!req->rq_packed_final) {
1467 err = lustre_pack_reply(req, 1, NULL, NULL);
1472 /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
1473 * ldlm_reprocess_all. If this moves, revisit that code. -phil */
1475 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
1476 "(err=%d, rc=%d)", err, rc);
1479 if (req_capsule_has_field(&req->rq_pill, &RMF_DLM_LVB,
1481 ldlm_lvbo_size(lock) > 0) {
1485 buf = req_capsule_server_get(&req->rq_pill,
1487 LASSERTF(buf != NULL, "req %p, lock %p\n",
1489 buflen = req_capsule_get_size(&req->rq_pill,
1490 &RMF_DLM_LVB, RCL_SERVER);
1491 /* non-replayed lock, delayed lvb init may
1492 * need to be occur now */
1493 if ((buflen > 0) && !(flags & LDLM_FL_REPLAY)) {
1494 buflen = ldlm_lvbo_fill(lock, buf,
1500 buflen, RCL_SERVER);
1503 } else if (flags & LDLM_FL_REPLAY) {
1504 /* no LVB resend upon replay */
1519 if (lock->l_export) {
1520 ldlm_lock_cancel(lock);
1522 lock_res_and_lock(lock);
1523 ldlm_resource_unlink_lock(lock);
1524 ldlm_lock_destroy_nolock(lock);
1525 unlock_res_and_lock(lock);
1530 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
1531 ldlm_reprocess_all(lock->l_resource);
1533 LDLM_LOCK_RELEASE(lock);
1536 LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
1543 * Old-style LDLM main entry point for server code enqueue.
1545 int ldlm_handle_enqueue(struct ptlrpc_request *req,
1546 ldlm_completion_callback completion_callback,
1547 ldlm_blocking_callback blocking_callback,
1548 ldlm_glimpse_callback glimpse_callback)
1550 struct ldlm_request *dlm_req;
1551 struct ldlm_callback_suite cbs = {
1552 .lcs_completion = completion_callback,
1553 .lcs_blocking = blocking_callback,
1554 .lcs_glimpse = glimpse_callback
1558 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1559 if (dlm_req != NULL) {
1560 rc = ldlm_handle_enqueue0(req->rq_export->exp_obd->obd_namespace,
1561 req, dlm_req, &cbs);
1569 * Main LDLM entry point for server code to process lock conversion requests.
1571 int ldlm_handle_convert0(struct ptlrpc_request *req,
1572 const struct ldlm_request *dlm_req)
1574 struct ldlm_reply *dlm_rep;
1575 struct ldlm_lock *lock;
1579 if (req->rq_export && req->rq_export->exp_nid_stats &&
1580 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1581 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1582 LDLM_CONVERT - LDLM_FIRST_OPC);
1584 rc = req_capsule_server_pack(&req->rq_pill);
1588 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1589 dlm_rep->lock_flags = dlm_req->lock_flags;
1591 lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
1593 req->rq_status = LUSTRE_EINVAL;
1597 LDLM_DEBUG(lock, "server-side convert handler START");
1599 res = ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
1600 &dlm_rep->lock_flags);
1602 if (ldlm_del_waiting_lock(lock))
1603 LDLM_DEBUG(lock, "converted waiting lock");
1606 req->rq_status = LUSTRE_EDEADLK;
1611 if (!req->rq_status)
1612 ldlm_reprocess_all(lock->l_resource);
1613 LDLM_DEBUG(lock, "server-side convert handler END");
1614 LDLM_LOCK_PUT(lock);
1616 LDLM_DEBUG_NOLOCK("server-side convert handler END");
1622 * Old-style main LDLM entry point for server code to process lock conversion
1625 int ldlm_handle_convert(struct ptlrpc_request *req)
1628 struct ldlm_request *dlm_req;
1630 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1631 if (dlm_req != NULL) {
1632 rc = ldlm_handle_convert0(req, dlm_req);
1634 CERROR ("Can't unpack dlm_req\n");
1641 * Cancel all the locks whose handles are packed into ldlm_request
1643 * Called by server code expecting such combined cancel activity
1646 int ldlm_request_cancel(struct ptlrpc_request *req,
1647 const struct ldlm_request *dlm_req,
1648 int first, enum lustre_at_flags flags)
1650 struct ldlm_resource *res, *pres = NULL;
1651 struct ldlm_lock *lock;
1652 int i, count, done = 0;
1655 count = dlm_req->lock_count ? dlm_req->lock_count : 1;
1659 if (count == 1 && dlm_req->lock_handle[0].cookie == 0)
1662 /* There is no lock on the server at the replay time,
1663 * skip lock cancelling to make replay tests to pass. */
1664 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1667 LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, "
1668 "starting at %d", count, first);
1670 for (i = first; i < count; i++) {
1671 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
1673 LDLM_DEBUG_NOLOCK("server-side cancel handler stale "
1674 "lock (cookie "LPU64")",
1675 dlm_req->lock_handle[i].cookie);
1679 res = lock->l_resource;
1682 /* This code is an optimization to only attempt lock
1683 * granting on the resource (that could be CPU-expensive)
1684 * after we are done cancelling lock in that resource. */
1687 ldlm_reprocess_all(pres);
1688 LDLM_RESOURCE_DELREF(pres);
1689 ldlm_resource_putref(pres);
1692 ldlm_resource_getref(res);
1693 LDLM_RESOURCE_ADDREF(res);
1694 ldlm_res_lvbo_update(res, NULL, 1);
1699 if ((flags & LATF_STATS) && ldlm_is_ast_sent(lock)) {
1700 long delay = cfs_time_sub(cfs_time_current_sec(),
1701 lock->l_last_activity);
1702 LDLM_DEBUG(lock, "server cancels blocked lock after "
1703 CFS_DURATION_T"s", delay);
1704 at_measured(&lock->l_export->exp_bl_lock_at, delay);
1706 ldlm_lock_cancel(lock);
1707 LDLM_LOCK_PUT(lock);
1710 ldlm_reprocess_all(pres);
1711 LDLM_RESOURCE_DELREF(pres);
1712 ldlm_resource_putref(pres);
1714 LDLM_DEBUG_NOLOCK("server-side cancel handler END");
1717 EXPORT_SYMBOL(ldlm_request_cancel);
1720 * Main LDLM entry point for server code to cancel locks.
1722 * Typically gets called from service handler on LDLM_CANCEL opc.
1724 int ldlm_handle_cancel(struct ptlrpc_request *req)
1726 struct ldlm_request *dlm_req;
1730 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1731 if (dlm_req == NULL) {
1732 CDEBUG(D_INFO, "bad request buffer for cancel\n");
1736 if (req->rq_export && req->rq_export->exp_nid_stats &&
1737 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1738 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1739 LDLM_CANCEL - LDLM_FIRST_OPC);
1741 rc = req_capsule_server_pack(&req->rq_pill);
1745 if (!ldlm_request_cancel(req, dlm_req, 0, LATF_STATS))
1746 req->rq_status = LUSTRE_ESTALE;
1748 RETURN(ptlrpc_reply(req));
1750 #endif /* HAVE_SERVER_SUPPORT */
1753 * Callback handler for receiving incoming blocking ASTs.
1755 * This can only happen on client side.
1757 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
1758 struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1763 LDLM_DEBUG(lock, "client blocking AST callback handler");
1765 lock_res_and_lock(lock);
1766 ldlm_set_cbpending(lock);
1768 if (ldlm_is_cancel_on_block(lock))
1769 ldlm_set_cancel(lock);
1771 do_ast = (!lock->l_readers && !lock->l_writers);
1772 unlock_res_and_lock(lock);
1775 CDEBUG(D_DLMTRACE, "Lock %p already unused, calling callback (%p)\n",
1776 lock, lock->l_blocking_ast);
1777 if (lock->l_blocking_ast != NULL)
1778 lock->l_blocking_ast(lock, ld, lock->l_ast_data,
1781 CDEBUG(D_DLMTRACE, "Lock %p is referenced, will be cancelled later\n",
1785 LDLM_DEBUG(lock, "client blocking callback handler END");
1786 LDLM_LOCK_RELEASE(lock);
1791 * Callback handler for receiving incoming completion ASTs.
1793 * This only can happen on client side.
1795 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
1796 struct ldlm_namespace *ns,
1797 struct ldlm_request *dlm_req,
1798 struct ldlm_lock *lock)
1800 struct list_head ast_list;
1805 LDLM_DEBUG(lock, "client completion callback handler START");
1807 INIT_LIST_HEAD(&ast_list);
1808 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) {
1809 int to = cfs_time_seconds(1);
1811 set_current_state(TASK_INTERRUPTIBLE);
1812 schedule_timeout(to);
1813 if (lock->l_granted_mode == lock->l_req_mode ||
1814 ldlm_is_destroyed(lock))
1819 lvb_len = req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT);
1821 LDLM_ERROR(lock, "Fail to get lvb_len, rc = %d", lvb_len);
1822 GOTO(out, rc = lvb_len);
1823 } else if (lvb_len > 0) {
1824 if (lock->l_lvb_len > 0) {
1825 /* for extent lock, lvb contains ost_lvb{}. */
1826 LASSERT(lock->l_lvb_data != NULL);
1828 if (unlikely(lock->l_lvb_len < lvb_len)) {
1829 LDLM_ERROR(lock, "Replied LVB is larger than "
1830 "expectation, expected = %d, "
1832 lock->l_lvb_len, lvb_len);
1833 GOTO(out, rc = -EINVAL);
1838 lock_res_and_lock(lock);
1839 if (ldlm_is_destroyed(lock) ||
1840 lock->l_granted_mode == lock->l_req_mode) {
1841 /* bug 11300: the lock has already been granted */
1842 unlock_res_and_lock(lock);
1843 LDLM_DEBUG(lock, "Double grant race happened");
1847 /* If we receive the completion AST before the actual enqueue returned,
1848 * then we might need to switch lock modes, resources, or extents. */
1849 if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
1850 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
1851 LDLM_DEBUG(lock, "completion AST, new lock mode");
1854 if (lock->l_resource->lr_type != LDLM_PLAIN) {
1855 ldlm_convert_policy_to_local(req->rq_export,
1856 dlm_req->lock_desc.l_resource.lr_type,
1857 &dlm_req->lock_desc.l_policy_data,
1858 &lock->l_policy_data);
1859 LDLM_DEBUG(lock, "completion AST, new policy data");
1862 ldlm_resource_unlink_lock(lock);
1863 if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
1864 &lock->l_resource->lr_name,
1865 sizeof(lock->l_resource->lr_name)) != 0) {
1866 unlock_res_and_lock(lock);
1867 rc = ldlm_lock_change_resource(ns, lock,
1868 &dlm_req->lock_desc.l_resource.lr_name);
1870 LDLM_ERROR(lock, "Failed to allocate resource");
1873 LDLM_DEBUG(lock, "completion AST, new resource");
1874 CERROR("change resource!\n");
1875 lock_res_and_lock(lock);
1878 if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
1879 /* BL_AST locks are not needed in LRU.
1880 * Let ldlm_cancel_lru() be fast. */
1881 ldlm_lock_remove_from_lru(lock);
1882 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
1883 LDLM_DEBUG(lock, "completion AST includes blocking AST");
1886 if (lock->l_lvb_len > 0) {
1887 rc = ldlm_fill_lvb(lock, &req->rq_pill, RCL_CLIENT,
1888 lock->l_lvb_data, lvb_len);
1890 unlock_res_and_lock(lock);
1895 ldlm_grant_lock(lock, &ast_list);
1896 unlock_res_and_lock(lock);
1898 LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
1900 /* Let Enqueue to call osc_lock_upcall() and initialize
1902 OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 2);
1904 ldlm_run_ast_work(ns, &ast_list, LDLM_WORK_CP_AST);
1906 LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
1912 lock_res_and_lock(lock);
1913 ldlm_set_failed(lock);
1914 unlock_res_and_lock(lock);
1915 wake_up(&lock->l_waitq);
1917 LDLM_LOCK_RELEASE(lock);
1921 * Callback handler for receiving incoming glimpse ASTs.
1923 * This only can happen on client side. After handling the glimpse AST
1924 * we also consider dropping the lock here if it is unused locally for a
1927 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
1928 struct ldlm_namespace *ns,
1929 struct ldlm_request *dlm_req,
1930 struct ldlm_lock *lock)
1935 LDLM_DEBUG(lock, "client glimpse AST callback handler");
1937 if (lock->l_glimpse_ast != NULL)
1938 rc = lock->l_glimpse_ast(lock, req);
1940 if (req->rq_repmsg != NULL) {
1943 req->rq_status = rc;
1947 lock_res_and_lock(lock);
1948 if (lock->l_granted_mode == LCK_PW &&
1949 !lock->l_readers && !lock->l_writers &&
1950 cfs_time_after(cfs_time_current(),
1951 cfs_time_add(lock->l_last_used,
1952 cfs_time_seconds(10)))) {
1953 unlock_res_and_lock(lock);
1954 if (ldlm_bl_to_thread_lock(ns, NULL, lock))
1955 ldlm_handle_bl_callback(ns, NULL, lock);
1960 unlock_res_and_lock(lock);
1961 LDLM_LOCK_RELEASE(lock);
1965 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1967 if (req->rq_no_reply)
1970 req->rq_status = rc;
1971 if (!req->rq_packed_final) {
1972 rc = lustre_pack_reply(req, 1, NULL, NULL);
1976 return ptlrpc_reply(req);
1979 static int __ldlm_bl_to_thread(struct ldlm_bl_work_item *blwi,
1980 enum ldlm_cancel_flags cancel_flags)
1982 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1985 spin_lock(&blp->blp_lock);
1986 if (blwi->blwi_lock &&
1987 ldlm_is_discard_data(blwi->blwi_lock)) {
1988 /* add LDLM_FL_DISCARD_DATA requests to the priority list */
1989 list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
1991 /* other blocking callbacks are added to the regular list */
1992 list_add_tail(&blwi->blwi_entry, &blp->blp_list);
1994 spin_unlock(&blp->blp_lock);
1996 wake_up(&blp->blp_waitq);
1998 /* can not check blwi->blwi_flags as blwi could be already freed in
2000 if (!(cancel_flags & LCF_ASYNC))
2001 wait_for_completion(&blwi->blwi_comp);
2006 static inline void init_blwi(struct ldlm_bl_work_item *blwi,
2007 struct ldlm_namespace *ns,
2008 struct ldlm_lock_desc *ld,
2009 struct list_head *cancels, int count,
2010 struct ldlm_lock *lock,
2011 enum ldlm_cancel_flags cancel_flags)
2013 init_completion(&blwi->blwi_comp);
2014 INIT_LIST_HEAD(&blwi->blwi_head);
2016 if (memory_pressure_get())
2017 blwi->blwi_mem_pressure = 1;
2020 blwi->blwi_flags = cancel_flags;
2022 blwi->blwi_ld = *ld;
2024 list_add(&blwi->blwi_head, cancels);
2025 list_del_init(cancels);
2026 blwi->blwi_count = count;
2028 blwi->blwi_lock = lock;
2033 * Queues a list of locks \a cancels containing \a count locks
2034 * for later processing by a blocking thread. If \a count is zero,
2035 * then the lock referenced as \a lock is queued instead.
2037 * The blocking thread would then call ->l_blocking_ast callback in the lock.
2038 * If list addition fails an error is returned and caller is supposed to
2039 * call ->l_blocking_ast itself.
2041 static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
2042 struct ldlm_lock_desc *ld,
2043 struct ldlm_lock *lock,
2044 struct list_head *cancels, int count,
2045 enum ldlm_cancel_flags cancel_flags)
2049 if (cancels && count == 0)
2052 if (cancel_flags & LCF_ASYNC) {
2053 struct ldlm_bl_work_item *blwi;
2055 OBD_ALLOC(blwi, sizeof(*blwi));
2058 init_blwi(blwi, ns, ld, cancels, count, lock, cancel_flags);
2060 RETURN(__ldlm_bl_to_thread(blwi, cancel_flags));
2062 /* if it is synchronous call do minimum mem alloc, as it could
2063 * be triggered from kernel shrinker
2065 struct ldlm_bl_work_item blwi;
2067 memset(&blwi, 0, sizeof(blwi));
2068 init_blwi(&blwi, ns, ld, cancels, count, lock, cancel_flags);
2069 RETURN(__ldlm_bl_to_thread(&blwi, cancel_flags));
2074 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
2075 struct ldlm_lock *lock)
2077 return ldlm_bl_to_thread(ns, ld, lock, NULL, 0, LCF_ASYNC);
2080 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
2081 struct list_head *cancels, int count,
2082 enum ldlm_cancel_flags cancel_flags)
2084 return ldlm_bl_to_thread(ns, ld, NULL, cancels, count, cancel_flags);
2087 int ldlm_bl_thread_wakeup(void)
2089 wake_up(&ldlm_state->ldlm_bl_pool->blp_waitq);
2093 /* Setinfo coming from Server (eg MDT) to Client (eg MDC)! */
2094 static int ldlm_handle_setinfo(struct ptlrpc_request *req)
2096 struct obd_device *obd = req->rq_export->exp_obd;
2103 DEBUG_REQ(D_HSM, req, "%s: handle setinfo\n", obd->obd_name);
2105 req_capsule_set(&req->rq_pill, &RQF_OBD_SET_INFO);
2107 key = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
2109 DEBUG_REQ(D_IOCTL, req, "no set_info key");
2112 keylen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_KEY,
2114 val = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
2116 DEBUG_REQ(D_IOCTL, req, "no set_info val");
2119 vallen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_VAL,
2122 /* We are responsible for swabbing contents of val */
2124 if (KEY_IS(KEY_HSM_COPYTOOL_SEND))
2125 /* Pass it on to mdc (the "export" in this case) */
2126 rc = obd_set_info_async(req->rq_svc_thread->t_env,
2128 sizeof(KEY_HSM_COPYTOOL_SEND),
2129 KEY_HSM_COPYTOOL_SEND,
2132 DEBUG_REQ(D_WARNING, req, "ignoring unknown key %s", key);
2137 static inline void ldlm_callback_errmsg(struct ptlrpc_request *req,
2138 const char *msg, int rc,
2139 struct lustre_handle *handle)
2141 DEBUG_REQ((req->rq_no_reply || rc) ? D_WARNING : D_DLMTRACE, req,
2142 "%s: [nid %s] [rc %d] [lock "LPX64"]",
2143 msg, libcfs_id2str(req->rq_peer), rc,
2144 handle ? handle->cookie : 0);
2145 if (req->rq_no_reply)
2146 CWARN("No reply was sent, maybe cause bug 21636.\n");
2148 CWARN("Send reply failed, maybe cause bug 21636.\n");
2151 /* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */
2152 static int ldlm_callback_handler(struct ptlrpc_request *req)
2154 struct ldlm_namespace *ns;
2155 struct ldlm_request *dlm_req;
2156 struct ldlm_lock *lock;
2160 /* Requests arrive in sender's byte order. The ptlrpc service
2161 * handler has already checked and, if necessary, byte-swapped the
2162 * incoming request message body, but I am responsible for the
2163 * message buffers. */
2165 /* do nothing for sec context finalize */
2166 if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI)
2169 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2171 if (req->rq_export == NULL) {
2172 rc = ldlm_callback_reply(req, -ENOTCONN);
2173 ldlm_callback_errmsg(req, "Operate on unconnected server",
2178 LASSERT(req->rq_export != NULL);
2179 LASSERT(req->rq_export->exp_obd != NULL);
2181 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2182 case LDLM_BL_CALLBACK:
2183 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET)) {
2185 ldlm_callback_reply(req, -(int)cfs_fail_err);
2189 case LDLM_CP_CALLBACK:
2190 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK_NET))
2193 case LDLM_GL_CALLBACK:
2194 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK_NET))
2198 rc = ldlm_handle_setinfo(req);
2199 ldlm_callback_reply(req, rc);
2201 case LLOG_ORIGIN_HANDLE_CREATE:
2202 req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
2203 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
2205 rc = llog_origin_handle_open(req);
2206 ldlm_callback_reply(req, rc);
2208 case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
2209 req_capsule_set(&req->rq_pill,
2210 &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
2211 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
2213 rc = llog_origin_handle_next_block(req);
2214 ldlm_callback_reply(req, rc);
2216 case LLOG_ORIGIN_HANDLE_READ_HEADER:
2217 req_capsule_set(&req->rq_pill,
2218 &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER);
2219 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
2221 rc = llog_origin_handle_read_header(req);
2222 ldlm_callback_reply(req, rc);
2224 case LLOG_ORIGIN_HANDLE_CLOSE:
2225 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
2227 rc = llog_origin_handle_close(req);
2228 ldlm_callback_reply(req, rc);
2231 CERROR("unknown opcode %u\n",
2232 lustre_msg_get_opc(req->rq_reqmsg));
2233 ldlm_callback_reply(req, -EPROTO);
2237 ns = req->rq_export->exp_obd->obd_namespace;
2238 LASSERT(ns != NULL);
2240 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2242 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2243 if (dlm_req == NULL) {
2244 rc = ldlm_callback_reply(req, -EPROTO);
2245 ldlm_callback_errmsg(req, "Operate without parameter", rc,
2250 /* Force a known safe race, send a cancel to the server for a lock
2251 * which the server has already started a blocking callback on. */
2252 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE) &&
2253 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
2254 rc = ldlm_cli_cancel(&dlm_req->lock_handle[0], 0);
2256 CERROR("ldlm_cli_cancel: %d\n", rc);
2259 lock = ldlm_handle2lock_long(&dlm_req->lock_handle[0], 0);
2261 CDEBUG(D_DLMTRACE, "callback on lock "LPX64" - lock "
2262 "disappeared\n", dlm_req->lock_handle[0].cookie);
2263 rc = ldlm_callback_reply(req, -EINVAL);
2264 ldlm_callback_errmsg(req, "Operate with invalid parameter", rc,
2265 &dlm_req->lock_handle[0]);
2269 if (ldlm_is_fail_loc(lock) &&
2270 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK)
2271 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
2273 /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
2274 lock_res_and_lock(lock);
2275 lock->l_flags |= ldlm_flags_from_wire(dlm_req->lock_flags &
2277 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
2278 /* If somebody cancels lock and cache is already dropped,
2279 * or lock is failed before cp_ast received on client,
2280 * we can tell the server we have no lock. Otherwise, we
2281 * should send cancel after dropping the cache. */
2282 if ((ldlm_is_canceling(lock) && ldlm_is_bl_done(lock)) ||
2283 ldlm_is_failed(lock)) {
2284 LDLM_DEBUG(lock, "callback on lock "
2285 LPX64" - lock disappeared\n",
2286 dlm_req->lock_handle[0].cookie);
2287 unlock_res_and_lock(lock);
2288 LDLM_LOCK_RELEASE(lock);
2289 rc = ldlm_callback_reply(req, -EINVAL);
2290 ldlm_callback_errmsg(req, "Operate on stale lock", rc,
2291 &dlm_req->lock_handle[0]);
2294 /* BL_AST locks are not needed in LRU.
2295 * Let ldlm_cancel_lru() be fast. */
2296 ldlm_lock_remove_from_lru(lock);
2297 ldlm_set_bl_ast(lock);
2299 unlock_res_and_lock(lock);
2301 /* We want the ost thread to get this reply so that it can respond
2302 * to ost requests (write cache writeback) that might be triggered
2305 * But we'd also like to be able to indicate in the reply that we're
2306 * cancelling right now, because it's unused, or have an intent result
2307 * in the reply, so we might have to push the responsibility for sending
2308 * the reply down into the AST handlers, alas. */
2310 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2311 case LDLM_BL_CALLBACK:
2312 CDEBUG(D_INODE, "blocking ast\n");
2313 req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
2314 if (!ldlm_is_cancel_on_block(lock)) {
2315 rc = ldlm_callback_reply(req, 0);
2316 if (req->rq_no_reply || rc)
2317 ldlm_callback_errmsg(req, "Normal process", rc,
2318 &dlm_req->lock_handle[0]);
2320 if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
2321 ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
2323 case LDLM_CP_CALLBACK:
2324 CDEBUG(D_INODE, "completion ast\n");
2325 req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
2326 ldlm_callback_reply(req, 0);
2327 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
2329 case LDLM_GL_CALLBACK:
2330 CDEBUG(D_INODE, "glimpse ast\n");
2331 req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
2332 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
2335 LBUG(); /* checked above */
2341 #ifdef HAVE_SERVER_SUPPORT
2343 * Main handler for canceld thread.
2345 * Separated into its own thread to avoid deadlocks.
2347 static int ldlm_cancel_handler(struct ptlrpc_request *req)
2352 /* Requests arrive in sender's byte order. The ptlrpc service
2353 * handler has already checked and, if necessary, byte-swapped the
2354 * incoming request message body, but I am responsible for the
2355 * message buffers. */
2357 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2359 if (req->rq_export == NULL) {
2360 struct ldlm_request *dlm_req;
2362 CERROR("%s from %s arrived at %lu with bad export cookie "
2364 ll_opcode2str(lustre_msg_get_opc(req->rq_reqmsg)),
2365 libcfs_nid2str(req->rq_peer.nid),
2366 req->rq_arrival_time.tv_sec,
2367 lustre_msg_get_handle(req->rq_reqmsg)->cookie);
2369 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_CANCEL) {
2370 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2371 dlm_req = req_capsule_client_get(&req->rq_pill,
2373 if (dlm_req != NULL)
2374 ldlm_lock_dump_handle(D_ERROR,
2375 &dlm_req->lock_handle[0]);
2377 ldlm_callback_reply(req, -ENOTCONN);
2381 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2383 /* XXX FIXME move this back to mds/handler.c, bug 249 */
2385 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
2386 CDEBUG(D_INODE, "cancel\n");
2387 if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_NET) ||
2388 CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND) ||
2389 CFS_FAIL_CHECK(OBD_FAIL_LDLM_BL_EVICT))
2391 rc = ldlm_handle_cancel(req);
2396 CERROR("invalid opcode %d\n",
2397 lustre_msg_get_opc(req->rq_reqmsg));
2398 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2399 ldlm_callback_reply(req, -EINVAL);
2405 static int ldlm_cancel_hpreq_lock_match(struct ptlrpc_request *req,
2406 struct ldlm_lock *lock)
2408 struct ldlm_request *dlm_req;
2409 struct lustre_handle lockh;
2414 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2415 if (dlm_req == NULL)
2418 ldlm_lock2handle(lock, &lockh);
2419 for (i = 0; i < dlm_req->lock_count; i++) {
2420 if (lustre_handle_equal(&dlm_req->lock_handle[i],
2422 DEBUG_REQ(D_RPCTRACE, req,
2423 "Prio raised by lock "LPX64".", lockh.cookie);
2434 static int ldlm_cancel_hpreq_check(struct ptlrpc_request *req)
2436 struct ldlm_request *dlm_req;
2441 /* no prolong in recovery */
2442 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
2445 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2446 if (dlm_req == NULL)
2449 for (i = 0; i < dlm_req->lock_count; i++) {
2450 struct ldlm_lock *lock;
2452 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
2456 rc = ldlm_is_ast_sent(lock) ? 1 : 0;
2458 LDLM_DEBUG(lock, "hpreq cancel lock");
2459 LDLM_LOCK_PUT(lock);
2468 static struct ptlrpc_hpreq_ops ldlm_cancel_hpreq_ops = {
2469 .hpreq_lock_match = ldlm_cancel_hpreq_lock_match,
2470 .hpreq_check = ldlm_cancel_hpreq_check,
2474 static int ldlm_hpreq_handler(struct ptlrpc_request *req)
2478 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2480 if (req->rq_export == NULL)
2483 if (LDLM_CANCEL == lustre_msg_get_opc(req->rq_reqmsg)) {
2484 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
2485 req->rq_ops = &ldlm_cancel_hpreq_ops;
2490 static int ldlm_revoke_lock_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
2491 struct hlist_node *hnode, void *data)
2494 struct list_head *rpc_list = data;
2495 struct ldlm_lock *lock = cfs_hash_object(hs, hnode);
2497 lock_res_and_lock(lock);
2499 if (lock->l_req_mode != lock->l_granted_mode) {
2500 unlock_res_and_lock(lock);
2504 LASSERT(lock->l_resource);
2505 if (lock->l_resource->lr_type != LDLM_IBITS &&
2506 lock->l_resource->lr_type != LDLM_PLAIN) {
2507 unlock_res_and_lock(lock);
2511 if (ldlm_is_ast_sent(lock)) {
2512 unlock_res_and_lock(lock);
2516 LASSERT(lock->l_blocking_ast);
2517 LASSERT(!lock->l_blocking_lock);
2519 ldlm_set_ast_sent(lock);
2520 if (lock->l_export && lock->l_export->exp_lock_hash) {
2521 /* NB: it's safe to call cfs_hash_del() even lock isn't
2522 * in exp_lock_hash. */
2523 /* In the function below, .hs_keycmp resolves to
2524 * ldlm_export_lock_keycmp() */
2525 /* coverity[overrun-buffer-val] */
2526 cfs_hash_del(lock->l_export->exp_lock_hash,
2527 &lock->l_remote_handle, &lock->l_exp_hash);
2530 list_add_tail(&lock->l_rk_ast, rpc_list);
2531 LDLM_LOCK_GET(lock);
2533 unlock_res_and_lock(lock);
2537 void ldlm_revoke_export_locks(struct obd_export *exp)
2539 struct list_head rpc_list;
2542 INIT_LIST_HEAD(&rpc_list);
2543 cfs_hash_for_each_empty(exp->exp_lock_hash,
2544 ldlm_revoke_lock_cb, &rpc_list);
2545 ldlm_run_ast_work(exp->exp_obd->obd_namespace, &rpc_list,
2546 LDLM_WORK_REVOKE_AST);
2550 EXPORT_SYMBOL(ldlm_revoke_export_locks);
2551 #endif /* HAVE_SERVER_SUPPORT */
2553 static int ldlm_bl_get_work(struct ldlm_bl_pool *blp,
2554 struct ldlm_bl_work_item **p_blwi,
2555 struct obd_export **p_exp)
2557 struct ldlm_bl_work_item *blwi = NULL;
2558 static unsigned int num_bl = 0;
2559 static unsigned int num_stale;
2560 int num_th = atomic_read(&blp->blp_num_threads);
2562 *p_exp = obd_stale_export_get();
2564 spin_lock(&blp->blp_lock);
2565 if (*p_exp != NULL) {
2566 if (num_th == 1 || ++num_stale < num_th) {
2567 spin_unlock(&blp->blp_lock);
2574 /* process a request from the blp_list at least every blp_num_threads */
2575 if (!list_empty(&blp->blp_list) &&
2576 (list_empty(&blp->blp_prio_list) || num_bl == 0))
2577 blwi = list_entry(blp->blp_list.next,
2578 struct ldlm_bl_work_item, blwi_entry);
2580 if (!list_empty(&blp->blp_prio_list))
2581 blwi = list_entry(blp->blp_prio_list.next,
2582 struct ldlm_bl_work_item,
2586 if (++num_bl >= num_th)
2588 list_del(&blwi->blwi_entry);
2590 spin_unlock(&blp->blp_lock);
2593 if (*p_exp != NULL && *p_blwi != NULL) {
2594 obd_stale_export_put(*p_exp);
2598 return (*p_blwi != NULL || *p_exp != NULL) ? 1 : 0;
2601 /* This only contains temporary data until the thread starts */
2602 struct ldlm_bl_thread_data {
2603 struct ldlm_bl_pool *bltd_blp;
2604 struct completion bltd_comp;
2608 static int ldlm_bl_thread_main(void *arg);
2610 static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp, bool check_busy)
2612 struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
2613 struct task_struct *task;
2615 init_completion(&bltd.bltd_comp);
2617 bltd.bltd_num = atomic_inc_return(&blp->blp_num_threads);
2618 if (bltd.bltd_num >= blp->blp_max_threads) {
2619 atomic_dec(&blp->blp_num_threads);
2623 LASSERTF(bltd.bltd_num > 0, "thread num:%d\n", bltd.bltd_num);
2625 atomic_read(&blp->blp_busy_threads) < (bltd.bltd_num - 1)) {
2626 atomic_dec(&blp->blp_num_threads);
2630 task = kthread_run(ldlm_bl_thread_main, &bltd, "ldlm_bl_%02d",
2633 CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %ld\n",
2634 bltd.bltd_num, PTR_ERR(task));
2635 atomic_dec(&blp->blp_num_threads);
2636 return PTR_ERR(task);
2638 wait_for_completion(&bltd.bltd_comp);
2643 /* Not fatal if racy and have a few too many threads */
2644 static int ldlm_bl_thread_need_create(struct ldlm_bl_pool *blp,
2645 struct ldlm_bl_work_item *blwi)
2647 if (atomic_read(&blp->blp_num_threads) >= blp->blp_max_threads)
2650 if (atomic_read(&blp->blp_busy_threads) <
2651 atomic_read(&blp->blp_num_threads))
2654 if (blwi != NULL && (blwi->blwi_ns == NULL ||
2655 blwi->blwi_mem_pressure))
2661 static int ldlm_bl_thread_blwi(struct ldlm_bl_pool *blp,
2662 struct ldlm_bl_work_item *blwi)
2666 if (blwi->blwi_ns == NULL)
2667 /* added by ldlm_cleanup() */
2668 RETURN(LDLM_ITER_STOP);
2670 if (blwi->blwi_mem_pressure)
2671 memory_pressure_set();
2673 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_PAUSE_CANCEL2, 4);
2675 if (blwi->blwi_count) {
2677 /* The special case when we cancel locks in lru
2678 * asynchronously, we pass the list of locks here.
2679 * Thus locks are marked LDLM_FL_CANCELING, but NOT
2680 * canceled locally yet. */
2681 count = ldlm_cli_cancel_list_local(&blwi->blwi_head,
2684 ldlm_cli_cancel_list(&blwi->blwi_head, count, NULL,
2687 ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
2690 if (blwi->blwi_mem_pressure)
2691 memory_pressure_clr();
2693 if (blwi->blwi_flags & LCF_ASYNC)
2694 OBD_FREE(blwi, sizeof(*blwi));
2696 complete(&blwi->blwi_comp);
2702 * Cancel stale locks on export. Cancel blocked locks first.
2703 * If the given export has blocked locks, the next in the list may have
2704 * them too, thus cancel not blocked locks only if the current export has
2707 static int ldlm_bl_thread_exports(struct ldlm_bl_pool *blp,
2708 struct obd_export *exp)
2713 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_BL_EVICT, 4);
2715 num = ldlm_export_cancel_blocked_locks(exp);
2717 ldlm_export_cancel_locks(exp);
2719 obd_stale_export_put(exp);
2726 * Main blocking requests processing thread.
2728 * Callers put locks into its queue by calling ldlm_bl_to_thread.
2729 * This thread in the end ends up doing actual call to ->l_blocking_ast
2732 static int ldlm_bl_thread_main(void *arg)
2734 struct ldlm_bl_pool *blp;
2735 struct ldlm_bl_thread_data *bltd = arg;
2738 blp = bltd->bltd_blp;
2740 complete(&bltd->bltd_comp);
2741 /* cannot use bltd after this, it is only on caller's stack */
2744 struct l_wait_info lwi = { 0 };
2745 struct ldlm_bl_work_item *blwi = NULL;
2746 struct obd_export *exp = NULL;
2749 rc = ldlm_bl_get_work(blp, &blwi, &exp);
2752 l_wait_event_exclusive(blp->blp_waitq,
2753 ldlm_bl_get_work(blp, &blwi,
2756 atomic_inc(&blp->blp_busy_threads);
2758 if (ldlm_bl_thread_need_create(blp, blwi))
2759 /* discard the return value, we tried */
2760 ldlm_bl_thread_start(blp, true);
2763 rc = ldlm_bl_thread_exports(blp, exp);
2765 rc = ldlm_bl_thread_blwi(blp, blwi);
2767 atomic_dec(&blp->blp_busy_threads);
2769 if (rc == LDLM_ITER_STOP)
2773 atomic_dec(&blp->blp_num_threads);
2774 complete(&blp->blp_comp);
2779 static int ldlm_setup(void);
2780 static int ldlm_cleanup(void);
2782 int ldlm_get_ref(void)
2786 mutex_lock(&ldlm_ref_mutex);
2787 if (++ldlm_refcount == 1) {
2792 mutex_unlock(&ldlm_ref_mutex);
2797 void ldlm_put_ref(void)
2800 mutex_lock(&ldlm_ref_mutex);
2801 if (ldlm_refcount == 1) {
2802 int rc = ldlm_cleanup();
2804 CERROR("ldlm_cleanup failed: %d\n", rc);
2810 mutex_unlock(&ldlm_ref_mutex);
2816 * Export handle<->lock hash operations.
2819 ldlm_export_lock_hash(struct cfs_hash *hs, const void *key, unsigned mask)
2821 return cfs_hash_u64_hash(((struct lustre_handle *)key)->cookie, mask);
2825 ldlm_export_lock_key(struct hlist_node *hnode)
2827 struct ldlm_lock *lock;
2829 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2830 return &lock->l_remote_handle;
2834 ldlm_export_lock_keycpy(struct hlist_node *hnode, void *key)
2836 struct ldlm_lock *lock;
2838 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2839 lock->l_remote_handle = *(struct lustre_handle *)key;
2843 ldlm_export_lock_keycmp(const void *key, struct hlist_node *hnode)
2845 return lustre_handle_equal(ldlm_export_lock_key(hnode), key);
2849 ldlm_export_lock_object(struct hlist_node *hnode)
2851 return hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2855 ldlm_export_lock_get(struct cfs_hash *hs, struct hlist_node *hnode)
2857 struct ldlm_lock *lock;
2859 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2860 LDLM_LOCK_GET(lock);
2864 ldlm_export_lock_put(struct cfs_hash *hs, struct hlist_node *hnode)
2866 struct ldlm_lock *lock;
2868 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2869 LDLM_LOCK_RELEASE(lock);
2872 static struct cfs_hash_ops ldlm_export_lock_ops = {
2873 .hs_hash = ldlm_export_lock_hash,
2874 .hs_key = ldlm_export_lock_key,
2875 .hs_keycmp = ldlm_export_lock_keycmp,
2876 .hs_keycpy = ldlm_export_lock_keycpy,
2877 .hs_object = ldlm_export_lock_object,
2878 .hs_get = ldlm_export_lock_get,
2879 .hs_put = ldlm_export_lock_put,
2880 .hs_put_locked = ldlm_export_lock_put,
2883 int ldlm_init_export(struct obd_export *exp)
2888 exp->exp_lock_hash =
2889 cfs_hash_create(obd_uuid2str(&exp->exp_client_uuid),
2890 HASH_EXP_LOCK_CUR_BITS,
2891 HASH_EXP_LOCK_MAX_BITS,
2892 HASH_EXP_LOCK_BKT_BITS, 0,
2893 CFS_HASH_MIN_THETA, CFS_HASH_MAX_THETA,
2894 &ldlm_export_lock_ops,
2895 CFS_HASH_DEFAULT | CFS_HASH_REHASH_KEY |
2896 CFS_HASH_NBLK_CHANGE);
2898 if (!exp->exp_lock_hash)
2901 rc = ldlm_init_flock_export(exp);
2907 ldlm_destroy_export(exp);
2910 EXPORT_SYMBOL(ldlm_init_export);
2912 void ldlm_destroy_export(struct obd_export *exp)
2915 cfs_hash_putref(exp->exp_lock_hash);
2916 exp->exp_lock_hash = NULL;
2918 ldlm_destroy_flock_export(exp);
2921 EXPORT_SYMBOL(ldlm_destroy_export);
2923 static int ldlm_setup(void)
2925 static struct ptlrpc_service_conf conf;
2926 struct ldlm_bl_pool *blp = NULL;
2927 #ifdef HAVE_SERVER_SUPPORT
2928 struct task_struct *task;
2929 #endif /* HAVE_SERVER_SUPPORT */
2935 if (ldlm_state != NULL)
2938 OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
2939 if (ldlm_state == NULL)
2942 #ifdef CONFIG_PROC_FS
2943 rc = ldlm_proc_setup();
2946 #endif /* CONFIG_PROC_FS */
2948 memset(&conf, 0, sizeof(conf));
2949 conf = (typeof(conf)) {
2950 .psc_name = "ldlm_cbd",
2951 .psc_watchdog_factor = 2,
2953 .bc_nbufs = LDLM_CLIENT_NBUFS,
2954 .bc_buf_size = LDLM_BUFSIZE,
2955 .bc_req_max_size = LDLM_MAXREQSIZE,
2956 .bc_rep_max_size = LDLM_MAXREPSIZE,
2957 .bc_req_portal = LDLM_CB_REQUEST_PORTAL,
2958 .bc_rep_portal = LDLM_CB_REPLY_PORTAL,
2961 .tc_thr_name = "ldlm_cb",
2962 .tc_thr_factor = LDLM_THR_FACTOR,
2963 .tc_nthrs_init = LDLM_NTHRS_INIT,
2964 .tc_nthrs_base = LDLM_NTHRS_BASE,
2965 .tc_nthrs_max = LDLM_NTHRS_MAX,
2966 .tc_nthrs_user = ldlm_num_threads,
2967 .tc_cpu_affinity = 1,
2968 .tc_ctx_tags = LCT_MD_THREAD | LCT_DT_THREAD,
2971 .cc_pattern = ldlm_cpts,
2974 .so_req_handler = ldlm_callback_handler,
2977 ldlm_state->ldlm_cb_service = \
2978 ptlrpc_register_service(&conf, ldlm_svc_proc_dir);
2979 if (IS_ERR(ldlm_state->ldlm_cb_service)) {
2980 CERROR("failed to start service\n");
2981 rc = PTR_ERR(ldlm_state->ldlm_cb_service);
2982 ldlm_state->ldlm_cb_service = NULL;
2986 #ifdef HAVE_SERVER_SUPPORT
2987 memset(&conf, 0, sizeof(conf));
2988 conf = (typeof(conf)) {
2989 .psc_name = "ldlm_canceld",
2990 .psc_watchdog_factor = 6,
2992 .bc_nbufs = LDLM_SERVER_NBUFS,
2993 .bc_buf_size = LDLM_BUFSIZE,
2994 .bc_req_max_size = LDLM_MAXREQSIZE,
2995 .bc_rep_max_size = LDLM_MAXREPSIZE,
2996 .bc_req_portal = LDLM_CANCEL_REQUEST_PORTAL,
2997 .bc_rep_portal = LDLM_CANCEL_REPLY_PORTAL,
3001 .tc_thr_name = "ldlm_cn",
3002 .tc_thr_factor = LDLM_THR_FACTOR,
3003 .tc_nthrs_init = LDLM_NTHRS_INIT,
3004 .tc_nthrs_base = LDLM_NTHRS_BASE,
3005 .tc_nthrs_max = LDLM_NTHRS_MAX,
3006 .tc_nthrs_user = ldlm_num_threads,
3007 .tc_cpu_affinity = 1,
3008 .tc_ctx_tags = LCT_MD_THREAD | \
3013 .cc_pattern = ldlm_cpts,
3016 .so_req_handler = ldlm_cancel_handler,
3017 .so_hpreq_handler = ldlm_hpreq_handler,
3020 ldlm_state->ldlm_cancel_service = \
3021 ptlrpc_register_service(&conf, ldlm_svc_proc_dir);
3022 if (IS_ERR(ldlm_state->ldlm_cancel_service)) {
3023 CERROR("failed to start service\n");
3024 rc = PTR_ERR(ldlm_state->ldlm_cancel_service);
3025 ldlm_state->ldlm_cancel_service = NULL;
3028 #endif /* HAVE_SERVER_SUPPORT */
3030 OBD_ALLOC(blp, sizeof(*blp));
3032 GOTO(out, rc = -ENOMEM);
3033 ldlm_state->ldlm_bl_pool = blp;
3035 spin_lock_init(&blp->blp_lock);
3036 INIT_LIST_HEAD(&blp->blp_list);
3037 INIT_LIST_HEAD(&blp->blp_prio_list);
3038 init_waitqueue_head(&blp->blp_waitq);
3039 atomic_set(&blp->blp_num_threads, 0);
3040 atomic_set(&blp->blp_busy_threads, 0);
3042 if (ldlm_num_threads == 0) {
3043 blp->blp_min_threads = LDLM_NTHRS_INIT;
3044 blp->blp_max_threads = LDLM_NTHRS_MAX;
3046 blp->blp_min_threads = blp->blp_max_threads = \
3047 min_t(int, LDLM_NTHRS_MAX, max_t(int, LDLM_NTHRS_INIT,
3051 for (i = 0; i < blp->blp_min_threads; i++) {
3052 rc = ldlm_bl_thread_start(blp, false);
3057 #ifdef HAVE_SERVER_SUPPORT
3058 INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
3059 expired_lock_thread.elt_state = ELT_STOPPED;
3060 init_waitqueue_head(&expired_lock_thread.elt_waitq);
3062 INIT_LIST_HEAD(&waiting_locks_list);
3063 spin_lock_init(&waiting_locks_spinlock);
3064 cfs_timer_init(&waiting_locks_timer, waiting_locks_callback, NULL);
3066 task = kthread_run(expired_lock_main, NULL, "ldlm_elt");
3069 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
3073 wait_event(expired_lock_thread.elt_waitq,
3074 expired_lock_thread.elt_state == ELT_READY);
3075 #endif /* HAVE_SERVER_SUPPORT */
3077 rc = ldlm_pools_init();
3079 CERROR("Failed to initialize LDLM pools: %d\n", rc);
3083 rc = ldlm_reclaim_setup();
3085 CERROR("Failed to setup reclaim thread: rc = %d\n", rc);
3095 static int ldlm_cleanup(void)
3099 if (!list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) ||
3100 !list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) {
3101 CERROR("ldlm still has namespaces; clean these up first.\n");
3102 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
3103 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
3107 ldlm_reclaim_cleanup();
3110 if (ldlm_state->ldlm_bl_pool != NULL) {
3111 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
3113 while (atomic_read(&blp->blp_num_threads) > 0) {
3114 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
3116 init_completion(&blp->blp_comp);
3118 spin_lock(&blp->blp_lock);
3119 list_add_tail(&blwi.blwi_entry, &blp->blp_list);
3120 wake_up(&blp->blp_waitq);
3121 spin_unlock(&blp->blp_lock);
3123 wait_for_completion(&blp->blp_comp);
3126 OBD_FREE(blp, sizeof(*blp));
3129 if (ldlm_state->ldlm_cb_service != NULL)
3130 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
3131 #ifdef HAVE_SERVER_SUPPORT
3132 if (ldlm_state->ldlm_cancel_service != NULL)
3133 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
3136 ldlm_proc_cleanup();
3138 #ifdef HAVE_SERVER_SUPPORT
3139 if (expired_lock_thread.elt_state != ELT_STOPPED) {
3140 expired_lock_thread.elt_state = ELT_TERMINATE;
3141 wake_up(&expired_lock_thread.elt_waitq);
3142 wait_event(expired_lock_thread.elt_waitq,
3143 expired_lock_thread.elt_state == ELT_STOPPED);
3147 OBD_FREE(ldlm_state, sizeof(*ldlm_state));
3155 mutex_init(&ldlm_ref_mutex);
3156 mutex_init(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER));
3157 mutex_init(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
3159 INIT_LIST_HEAD(&ldlm_srv_namespace_list);
3160 INIT_LIST_HEAD(&ldlm_cli_active_namespace_list);
3161 INIT_LIST_HEAD(&ldlm_cli_inactive_namespace_list);
3163 ldlm_resource_slab = kmem_cache_create("ldlm_resources",
3164 sizeof(struct ldlm_resource), 0,
3165 SLAB_HWCACHE_ALIGN, NULL);
3166 if (ldlm_resource_slab == NULL)
3169 ldlm_lock_slab = kmem_cache_create("ldlm_locks",
3170 sizeof(struct ldlm_lock), 0,
3171 SLAB_HWCACHE_ALIGN | SLAB_DESTROY_BY_RCU, NULL);
3172 if (ldlm_lock_slab == NULL)
3175 ldlm_interval_slab = kmem_cache_create("interval_node",
3176 sizeof(struct ldlm_interval),
3177 0, SLAB_HWCACHE_ALIGN, NULL);
3178 if (ldlm_interval_slab == NULL)
3181 ldlm_interval_tree_slab = kmem_cache_create("interval_tree",
3182 sizeof(struct ldlm_interval_tree) * LCK_MODE_NUM,
3183 0, SLAB_HWCACHE_ALIGN, NULL);
3184 if (ldlm_interval_tree_slab == NULL)
3187 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3188 class_export_dump_hook = ldlm_dump_export_locks;
3193 kmem_cache_destroy(ldlm_interval_slab);
3195 kmem_cache_destroy(ldlm_lock_slab);
3197 kmem_cache_destroy(ldlm_resource_slab);
3202 void ldlm_exit(void)
3205 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
3206 kmem_cache_destroy(ldlm_resource_slab);
3207 /* ldlm_lock_put() use RCU to call ldlm_lock_free, so need call
3208 * synchronize_rcu() to wait a grace period elapsed, so that
3209 * ldlm_lock_free() get a chance to be called. */
3211 kmem_cache_destroy(ldlm_lock_slab);
3212 kmem_cache_destroy(ldlm_interval_slab);
3213 kmem_cache_destroy(ldlm_interval_tree_slab);