1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
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>
43 # define EXPORT_SYMTAB
45 #define DEBUG_SUBSYSTEM S_LDLM
48 # include <libcfs/libcfs.h>
50 # include <liblustre.h>
53 #include <lustre_dlm.h>
54 #include <obd_class.h>
55 #include <libcfs/list.h>
56 #include "ldlm_internal.h"
59 static int ldlm_num_threads;
60 CFS_MODULE_PARM(ldlm_num_threads, "i", int, 0444,
61 "number of DLM service threads to start");
64 extern cfs_mem_cache_t *ldlm_resource_slab;
65 extern cfs_mem_cache_t *ldlm_lock_slab;
66 static struct semaphore ldlm_ref_sem;
67 static int ldlm_refcount;
71 static struct ldlm_state *ldlm_state;
73 inline cfs_time_t round_timeout(cfs_time_t timeout)
75 return cfs_time_seconds((int)cfs_duration_sec(cfs_time_sub(timeout, 0)) + 1);
78 /* timeout for initial callback (AST) reply (bz10399) */
79 static inline unsigned int ldlm_get_rq_timeout(void)
82 unsigned int timeout = min(ldlm_timeout, obd_timeout / 3);
84 return timeout < 1 ? 1 : timeout;
88 /* w_l_spinlock protects both waiting_locks_list and expired_lock_thread */
89 static spinlock_t waiting_locks_spinlock; /* BH lock (timer) */
90 static struct list_head waiting_locks_list;
91 static cfs_timer_t waiting_locks_timer;
93 static struct expired_lock_thread {
94 cfs_waitq_t elt_waitq;
97 struct list_head elt_expired_locks;
98 } expired_lock_thread;
101 #define ELT_STOPPED 0
103 #define ELT_TERMINATE 2
105 struct ldlm_bl_pool {
109 * blp_prio_list is used for callbacks that should be handled
110 * as a priority. It is used for LDLM_FL_DISCARD_DATA requests.
113 struct list_head blp_prio_list;
116 * blp_list is used for all other callbacks which are likely
117 * to take longer to process.
119 struct list_head blp_list;
121 cfs_waitq_t blp_waitq;
122 struct completion blp_comp;
123 atomic_t blp_num_threads;
124 atomic_t blp_busy_threads;
129 struct ldlm_bl_work_item {
130 struct list_head blwi_entry;
131 struct ldlm_namespace *blwi_ns;
132 struct ldlm_lock_desc blwi_ld;
133 struct ldlm_lock *blwi_lock;
134 struct list_head blwi_head;
140 static inline int have_expired_locks(void)
145 spin_lock_bh(&waiting_locks_spinlock);
146 need_to_run = !list_empty(&expired_lock_thread.elt_expired_locks);
147 spin_unlock_bh(&waiting_locks_spinlock);
152 static int expired_lock_main(void *arg)
154 struct list_head *expired = &expired_lock_thread.elt_expired_locks;
155 struct l_wait_info lwi = { 0 };
159 cfs_daemonize("ldlm_elt");
161 expired_lock_thread.elt_state = ELT_READY;
162 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
165 l_wait_event(expired_lock_thread.elt_waitq,
166 have_expired_locks() ||
167 expired_lock_thread.elt_state == ELT_TERMINATE,
170 spin_lock_bh(&waiting_locks_spinlock);
171 if (expired_lock_thread.elt_dump) {
172 spin_unlock_bh(&waiting_locks_spinlock);
174 /* from waiting_locks_callback, but not in timer */
175 libcfs_debug_dumplog();
176 libcfs_run_lbug_upcall(__FILE__,
177 "waiting_locks_callback",
178 expired_lock_thread.elt_dump);
180 spin_lock_bh(&waiting_locks_spinlock);
181 expired_lock_thread.elt_dump = 0;
186 while (!list_empty(expired)) {
187 struct obd_export *export;
188 struct ldlm_lock *lock;
190 lock = list_entry(expired->next, struct ldlm_lock,
192 if ((void *)lock < LP_POISON + CFS_PAGE_SIZE &&
193 (void *)lock >= LP_POISON) {
194 spin_unlock_bh(&waiting_locks_spinlock);
195 CERROR("free lock on elt list %p\n", lock);
198 list_del_init(&lock->l_pending_chain);
199 if ((void *)lock->l_export < LP_POISON + CFS_PAGE_SIZE &&
200 (void *)lock->l_export >= LP_POISON) {
201 CERROR("lock with free export on elt list %p\n",
203 lock->l_export = NULL;
204 LDLM_ERROR(lock, "free export");
205 /* release extra ref grabbed by
206 * ldlm_add_waiting_lock() or
207 * ldlm_failed_ast() */
208 LDLM_LOCK_RELEASE(lock);
211 export = class_export_lock_get(lock->l_export, lock);
212 spin_unlock_bh(&waiting_locks_spinlock);
214 /* release extra ref grabbed by ldlm_add_waiting_lock()
215 * or ldlm_failed_ast() */
216 LDLM_LOCK_RELEASE(lock);
219 class_fail_export(export);
220 class_export_lock_put(export, lock);
221 spin_lock_bh(&waiting_locks_spinlock);
223 spin_unlock_bh(&waiting_locks_spinlock);
225 if (do_dump && obd_dump_on_eviction) {
226 CERROR("dump the log upon eviction\n");
227 libcfs_debug_dumplog();
230 if (expired_lock_thread.elt_state == ELT_TERMINATE)
234 expired_lock_thread.elt_state = ELT_STOPPED;
235 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
239 static int ldlm_add_waiting_lock(struct ldlm_lock *lock);
242 * Check if there is a request in the export request list
243 * which prevents the lock canceling.
245 static int ldlm_lock_busy(struct ldlm_lock *lock)
247 struct ptlrpc_request *req;
251 if (lock->l_export == NULL)
254 spin_lock(&lock->l_export->exp_lock);
255 list_for_each_entry(req, &lock->l_export->exp_queued_rpc, rq_exp_list) {
256 if (req->rq_ops->hpreq_lock_match) {
257 match = req->rq_ops->hpreq_lock_match(req, lock);
262 spin_unlock(&lock->l_export->exp_lock);
266 /* This is called from within a timer interrupt and cannot schedule */
267 static void waiting_locks_callback(unsigned long unused)
269 struct ldlm_lock *lock, *last = NULL;
272 spin_lock_bh(&waiting_locks_spinlock);
273 while (!list_empty(&waiting_locks_list)) {
274 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
276 if (cfs_time_after(lock->l_callback_timeout, cfs_time_current()) ||
277 (lock->l_req_mode == LCK_GROUP))
280 if (ptlrpc_check_suspend()) {
281 /* there is a case when we talk to one mds, holding
282 * lock from another mds. this way we easily can get
283 * here, if second mds is being recovered. so, we
284 * suspend timeouts. bug 6019 */
286 LDLM_ERROR(lock, "recharge timeout: %s@%s nid %s ",
287 lock->l_export->exp_client_uuid.uuid,
288 lock->l_export->exp_connection->c_remote_uuid.uuid,
289 libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
291 list_del_init(&lock->l_pending_chain);
292 spin_unlock_bh(&waiting_locks_spinlock);
293 ldlm_add_waiting_lock(lock);
297 /* if timeout overlaps the activation time of suspended timeouts
298 * then extend it to give a chance for client to reconnect */
299 if (cfs_time_before(cfs_time_sub(lock->l_callback_timeout,
300 cfs_time_seconds(obd_timeout)/2),
301 ptlrpc_suspend_wakeup_time())) {
302 LDLM_ERROR(lock, "extend timeout due to recovery: %s@%s nid %s ",
303 lock->l_export->exp_client_uuid.uuid,
304 lock->l_export->exp_connection->c_remote_uuid.uuid,
305 libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
307 list_del_init(&lock->l_pending_chain);
308 spin_unlock_bh(&waiting_locks_spinlock);
309 ldlm_add_waiting_lock(lock);
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_get_enq_timeout(lock));
327 spin_lock_bh(&waiting_locks_spinlock);
330 LDLM_LOCK_RELEASE(lock);
334 LDLM_LOCK_RELEASE(lock);
337 lock->l_resource->lr_namespace->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));
346 /* no needs to take an extra ref on the lock since it was in
347 * the waiting_locks_list and ldlm_add_waiting_lock()
348 * already grabbed a ref */
349 list_del(&lock->l_pending_chain);
350 list_add(&lock->l_pending_chain,
351 &expired_lock_thread.elt_expired_locks);
354 if (!list_empty(&expired_lock_thread.elt_expired_locks)) {
355 if (obd_dump_on_timeout)
356 expired_lock_thread.elt_dump = __LINE__;
358 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
362 * Make sure the timer will fire again if we have any locks
365 if (!list_empty(&waiting_locks_list)) {
366 cfs_time_t timeout_rounded;
367 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
369 timeout_rounded = (cfs_time_t)round_timeout(lock->l_callback_timeout);
370 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
372 spin_unlock_bh(&waiting_locks_spinlock);
376 * Indicate that we're waiting for a client to call us back cancelling a given
377 * lock. We add it to the pending-callback chain, and schedule the lock-timeout
378 * timer to fire appropriately. (We round up to the next second, to avoid
379 * floods of timer firings during periods of high lock contention and traffic).
380 * As done by ldlm_add_waiting_lock(), the caller must grab a lock reference
381 * if it has been added to the waiting list (1 is returned).
383 * Called with the namespace lock held.
385 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, int seconds)
388 cfs_time_t timeout_rounded;
390 if (!list_empty(&lock->l_pending_chain))
393 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT) ||
394 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
397 timeout = cfs_time_shift(seconds);
398 if (likely(cfs_time_after(timeout, lock->l_callback_timeout)))
399 lock->l_callback_timeout = timeout;
401 timeout_rounded = round_timeout(lock->l_callback_timeout);
403 if (cfs_time_before(timeout_rounded,
404 cfs_timer_deadline(&waiting_locks_timer)) ||
405 !cfs_timer_is_armed(&waiting_locks_timer)) {
406 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
408 /* if the new lock has a shorter timeout than something earlier on
409 the list, we'll wait the longer amount of time; no big deal. */
410 list_add_tail(&lock->l_pending_chain, &waiting_locks_list); /* FIFO */
414 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
417 int timeout = ldlm_get_enq_timeout(lock);
419 LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK));
421 spin_lock_bh(&waiting_locks_spinlock);
422 if (lock->l_destroyed) {
423 static cfs_time_t next;
424 spin_unlock_bh(&waiting_locks_spinlock);
425 LDLM_ERROR(lock, "not waiting on destroyed lock (bug 5653)");
426 if (cfs_time_after(cfs_time_current(), next)) {
427 next = cfs_time_shift(14400);
428 libcfs_debug_dumpstack(NULL);
433 ret = __ldlm_add_waiting_lock(lock, timeout);
435 /* grab ref on the lock if it has been added to the
438 spin_unlock_bh(&waiting_locks_spinlock);
440 LDLM_DEBUG(lock, "%sadding to wait list(timeout: %d, AT: %s)",
441 ret == 0 ? "not re-" : "", timeout,
442 AT_OFF ? "off" : "on");
447 * Remove a lock from the pending list, likely because it had its cancellation
448 * callback arrive without incident. This adjusts the lock-timeout timer if
449 * needed. Returns 0 if the lock wasn't pending after all, 1 if it was.
450 * As done by ldlm_del_waiting_lock(), the caller must release the lock
451 * reference when the lock is removed from any list (1 is returned).
453 * Called with namespace lock held.
455 static int __ldlm_del_waiting_lock(struct ldlm_lock *lock)
457 struct list_head *list_next;
459 if (list_empty(&lock->l_pending_chain))
462 list_next = lock->l_pending_chain.next;
463 if (lock->l_pending_chain.prev == &waiting_locks_list) {
464 /* Removing the head of the list, adjust timer. */
465 if (list_next == &waiting_locks_list) {
466 /* No more, just cancel. */
467 cfs_timer_disarm(&waiting_locks_timer);
469 struct ldlm_lock *next;
470 next = list_entry(list_next, struct ldlm_lock,
472 cfs_timer_arm(&waiting_locks_timer,
473 round_timeout(next->l_callback_timeout));
476 list_del_init(&lock->l_pending_chain);
481 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
485 if (lock->l_export == NULL) {
486 /* We don't have a "waiting locks list" on clients. */
487 LDLM_DEBUG(lock, "client lock: no-op");
491 spin_lock_bh(&waiting_locks_spinlock);
492 ret = __ldlm_del_waiting_lock(lock);
493 spin_unlock_bh(&waiting_locks_spinlock);
495 /* release lock ref if it has indeed been removed
497 LDLM_LOCK_RELEASE(lock);
499 LDLM_DEBUG(lock, "%s", ret == 0 ? "wasn't waiting" : "removed");
506 * Called with namespace lock held.
508 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout)
510 if (lock->l_export == NULL) {
511 /* We don't have a "waiting locks list" on clients. */
512 LDLM_DEBUG(lock, "client lock: no-op");
516 spin_lock_bh(&waiting_locks_spinlock);
518 if (list_empty(&lock->l_pending_chain)) {
519 spin_unlock_bh(&waiting_locks_spinlock);
520 LDLM_DEBUG(lock, "wasn't waiting");
524 /* we remove/add the lock to the waiting list, so no needs to
525 * release/take a lock reference */
526 __ldlm_del_waiting_lock(lock);
527 __ldlm_add_waiting_lock(lock, timeout);
528 spin_unlock_bh(&waiting_locks_spinlock);
530 LDLM_DEBUG(lock, "refreshed");
533 #else /* !__KERNEL__ */
535 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
537 LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK));
541 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
546 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout)
550 #endif /* __KERNEL__ */
552 static void ldlm_failed_ast(struct ldlm_lock *lock, int rc,
553 const char *ast_type)
555 LCONSOLE_ERROR_MSG(0x138, "%s: A client on nid %s was evicted due "
556 "to a lock %s callback time out: rc %d\n",
557 lock->l_export->exp_obd->obd_name,
558 obd_export_nid2str(lock->l_export), ast_type, rc);
560 if (obd_dump_on_timeout)
561 libcfs_debug_dumplog();
563 spin_lock_bh(&waiting_locks_spinlock);
564 if (__ldlm_del_waiting_lock(lock) == 0)
565 /* the lock was not in any list, grab an extra ref before adding
566 * the lock to the expired list */
568 list_add(&lock->l_pending_chain, &expired_lock_thread.elt_expired_locks);
569 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
570 spin_unlock_bh(&waiting_locks_spinlock);
572 class_fail_export(lock->l_export);
576 static int ldlm_handle_ast_error(struct ldlm_lock *lock,
577 struct ptlrpc_request *req, int rc,
578 const char *ast_type)
580 lnet_process_id_t peer = req->rq_import->imp_connection->c_peer;
582 if (rc == -ETIMEDOUT || rc == -EINTR || rc == -ENOTCONN) {
583 LASSERT(lock->l_export);
584 if (lock->l_export->exp_libclient) {
585 LDLM_DEBUG(lock, "%s AST to liblustre client (nid %s)"
586 " timeout, just cancelling lock", ast_type,
587 libcfs_nid2str(peer.nid));
588 ldlm_lock_cancel(lock);
590 } else if (lock->l_flags & LDLM_FL_CANCEL) {
591 LDLM_DEBUG(lock, "%s AST timeout from nid %s, but "
592 "cancel was received (AST reply lost?)",
593 ast_type, libcfs_nid2str(peer.nid));
594 ldlm_lock_cancel(lock);
597 ldlm_del_waiting_lock(lock);
598 ldlm_failed_ast(lock, rc, ast_type);
602 LDLM_DEBUG(lock, "client (nid %s) returned %d"
603 " from %s AST - normal race",
604 libcfs_nid2str(peer.nid),
606 lustre_msg_get_status(req->rq_repmsg) : -1,
609 LDLM_ERROR(lock, "client (nid %s) returned %d "
610 "from %s AST", libcfs_nid2str(peer.nid),
611 (req->rq_repmsg != NULL) ?
612 lustre_msg_get_status(req->rq_repmsg) : 0,
614 ldlm_lock_cancel(lock);
615 /* Server-side AST functions are called from ldlm_reprocess_all,
616 * which needs to be told to please restart its reprocessing. */
623 static int ldlm_cb_interpret(const struct lu_env *env,
624 struct ptlrpc_request *req, void *data, int rc)
626 struct ldlm_cb_set_arg *arg;
627 struct ldlm_lock *lock;
630 LASSERT(data != NULL);
632 arg = req->rq_async_args.pointer_arg[0];
633 lock = req->rq_async_args.pointer_arg[1];
634 LASSERT(lock != NULL);
636 /* If client canceled the lock but the cancel has not
637 * been received yet, we need to update lvbo to have the
638 * proper attributes cached. */
639 if (rc == -EINVAL && arg->type == LDLM_BL_CALLBACK)
640 ldlm_res_lvbo_update(lock->l_resource, NULL, 1);
641 rc = ldlm_handle_ast_error(lock, req, rc,
642 arg->type == LDLM_BL_CALLBACK
643 ? "blocking" : "completion");
646 LDLM_LOCK_RELEASE(lock);
649 atomic_set(&arg->restart, 1);
654 static inline int ldlm_bl_and_cp_ast_fini(struct ptlrpc_request *req,
655 struct ldlm_cb_set_arg *arg,
656 struct ldlm_lock *lock,
662 if (unlikely(instant_cancel)) {
663 rc = ptl_send_rpc(req, 1);
664 ptlrpc_req_finished(req);
666 /* If we cancelled the lock, we need to restart
667 * ldlm_reprocess_queue */
668 atomic_set(&arg->restart, 1);
671 ptlrpc_set_add_req(arg->set, req);
678 * Check if there are requests in the export request list which prevent
679 * the lock canceling and make these requests high priority ones.
681 static void ldlm_lock_reorder_req(struct ldlm_lock *lock)
683 struct ptlrpc_request *req;
686 if (lock->l_export == NULL) {
687 LDLM_DEBUG(lock, "client lock: no-op");
691 spin_lock(&lock->l_export->exp_lock);
692 list_for_each_entry(req, &lock->l_export->exp_queued_rpc, rq_exp_list) {
693 if (!req->rq_hp && req->rq_ops->hpreq_lock_match &&
694 req->rq_ops->hpreq_lock_match(req, lock))
695 ptlrpc_hpreq_reorder(req);
697 spin_unlock(&lock->l_export->exp_lock);
702 * ->l_blocking_ast() method for server-side locks. This is invoked when newly
703 * enqueued server lock conflicts with given one.
705 * Sends blocking ast rpc to the client owning that lock; arms timeout timer
706 * to wait for client response.
708 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
709 struct ldlm_lock_desc *desc,
710 void *data, int flag)
712 struct ldlm_cb_set_arg *arg = data;
713 struct ldlm_request *body;
714 struct ptlrpc_request *req;
715 int instant_cancel = 0;
719 if (flag == LDLM_CB_CANCELING)
720 /* Don't need to do anything here. */
724 LASSERT(data != NULL);
725 if (lock->l_export->exp_obd->obd_recovering != 0) {
726 LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
727 ldlm_lock_dump(D_ERROR, lock, 0);
730 ldlm_lock_reorder_req(lock);
732 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
733 &RQF_LDLM_BL_CALLBACK,
734 LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK);
738 req->rq_async_args.pointer_arg[0] = arg;
739 req->rq_async_args.pointer_arg[1] = lock;
740 req->rq_interpret_reply = ldlm_cb_interpret;
741 req->rq_no_resend = 1;
743 lock_res(lock->l_resource);
744 if (lock->l_granted_mode != lock->l_req_mode) {
745 /* this blocking AST will be communicated as part of the
746 * completion AST instead */
747 unlock_res(lock->l_resource);
748 ptlrpc_req_finished(req);
749 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
753 if (lock->l_destroyed) {
754 /* What's the point? */
755 unlock_res(lock->l_resource);
756 ptlrpc_req_finished(req);
760 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
763 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
764 body->lock_handle[0] = lock->l_remote_handle;
765 body->lock_desc = *desc;
766 body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
768 LDLM_DEBUG(lock, "server preparing blocking AST");
770 ptlrpc_request_set_replen(req);
771 if (instant_cancel) {
772 unlock_res(lock->l_resource);
773 ldlm_lock_cancel(lock);
775 LASSERT(lock->l_granted_mode == lock->l_req_mode);
776 ldlm_add_waiting_lock(lock);
777 unlock_res(lock->l_resource);
780 req->rq_send_state = LUSTRE_IMP_FULL;
781 /* ptlrpc_request_alloc_pack already set timeout */
783 req->rq_timeout = ldlm_get_rq_timeout();
785 if (lock->l_export && lock->l_export->exp_nid_stats &&
786 lock->l_export->exp_nid_stats->nid_ldlm_stats)
787 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
788 LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
790 rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
795 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data)
797 struct ldlm_cb_set_arg *arg = data;
798 struct ldlm_request *body;
799 struct ptlrpc_request *req;
800 long total_enqueue_wait;
801 int instant_cancel = 0;
805 LASSERT(lock != NULL);
806 LASSERT(data != NULL);
808 total_enqueue_wait = cfs_time_sub(cfs_time_current_sec(),
809 lock->l_last_activity);
811 req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse,
812 &RQF_LDLM_CP_CALLBACK);
816 lock_res_and_lock(lock);
817 if (lock->l_resource->lr_lvb_len)
818 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT,
819 lock->l_resource->lr_lvb_len);
820 unlock_res_and_lock(lock);
822 rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK);
824 ptlrpc_request_free(req);
828 req->rq_async_args.pointer_arg[0] = arg;
829 req->rq_async_args.pointer_arg[1] = lock;
830 req->rq_interpret_reply = ldlm_cb_interpret;
831 req->rq_no_resend = 1;
832 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
834 body->lock_handle[0] = lock->l_remote_handle;
835 body->lock_flags = flags;
836 ldlm_lock2desc(lock, &body->lock_desc);
837 if (lock->l_resource->lr_lvb_len) {
838 void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB);
840 lock_res_and_lock(lock);
841 memcpy(lvb, lock->l_resource->lr_lvb_data,
842 lock->l_resource->lr_lvb_len);
843 unlock_res_and_lock(lock);
846 LDLM_DEBUG(lock, "server preparing completion AST (after %lds wait)",
849 /* Server-side enqueue wait time estimate, used in
850 __ldlm_add_waiting_lock to set future enqueue timers */
851 if (total_enqueue_wait < ldlm_get_enq_timeout(lock))
852 at_add(&lock->l_resource->lr_namespace->ns_at_estimate,
855 /* bz18618. Don't add lock enqueue time we spend waiting for a
856 previous callback to fail. Locks waiting legitimately will
857 get extended by ldlm_refresh_waiting_lock regardless of the
858 estimate, so it's okay to underestimate here. */
859 LDLM_DEBUG(lock, "lock completed after %lus; estimate was %ds. "
860 "It is likely that a previous callback timed out.",
862 at_get(&lock->l_resource->lr_namespace->ns_at_estimate));
864 ptlrpc_request_set_replen(req);
866 req->rq_send_state = LUSTRE_IMP_FULL;
867 /* ptlrpc_request_pack already set timeout */
869 req->rq_timeout = ldlm_get_rq_timeout();
871 /* We only send real blocking ASTs after the lock is granted */
872 lock_res_and_lock(lock);
873 if (lock->l_flags & LDLM_FL_AST_SENT) {
874 body->lock_flags |= LDLM_FL_AST_SENT;
875 /* copy ast flags like LDLM_FL_DISCARD_DATA */
876 body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
878 /* We might get here prior to ldlm_handle_enqueue setting
879 * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
880 * into waiting list, but this is safe and similar code in
881 * ldlm_handle_enqueue will call ldlm_lock_cancel() still,
882 * that would not only cancel the lock, but will also remove
883 * it from waiting list */
884 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
885 unlock_res_and_lock(lock);
886 ldlm_lock_cancel(lock);
888 lock_res_and_lock(lock);
890 /* start the lock-timeout clock */
891 ldlm_add_waiting_lock(lock);
894 unlock_res_and_lock(lock);
896 if (lock->l_export && lock->l_export->exp_nid_stats &&
897 lock->l_export->exp_nid_stats->nid_ldlm_stats)
898 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
899 LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
901 rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
906 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
908 struct ldlm_resource *res = lock->l_resource;
909 struct ldlm_request *body;
910 struct ptlrpc_request *req;
914 LASSERT(lock != NULL);
916 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
917 &RQF_LDLM_GL_CALLBACK,
918 LUSTRE_DLM_VERSION, LDLM_GL_CALLBACK);
923 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
924 body->lock_handle[0] = lock->l_remote_handle;
925 ldlm_lock2desc(lock, &body->lock_desc);
927 lock_res_and_lock(lock);
928 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
929 lock->l_resource->lr_lvb_len);
930 unlock_res_and_lock(lock);
931 res = lock->l_resource;
932 ptlrpc_request_set_replen(req);
935 req->rq_send_state = LUSTRE_IMP_FULL;
936 /* ptlrpc_request_alloc_pack already set timeout */
938 req->rq_timeout = ldlm_get_rq_timeout();
940 if (lock->l_export && lock->l_export->exp_nid_stats &&
941 lock->l_export->exp_nid_stats->nid_ldlm_stats)
942 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
943 LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
945 rc = ptlrpc_queue_wait(req);
946 if (rc == -ELDLM_NO_LOCK_DATA)
947 LDLM_DEBUG(lock, "lost race - client has a lock but no inode");
949 rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
951 rc = ldlm_res_lvbo_update(res, req, 1);
953 ptlrpc_req_finished(req);
955 ldlm_reprocess_all(res);
961 extern unsigned long long lu_time_stamp_get(void);
963 #define lu_time_stamp_get() time(NULL)
966 static void ldlm_svc_get_eopc(const struct ldlm_request *dlm_req,
967 struct lprocfs_stats *srv_stats)
969 int lock_type = 0, op = 0;
971 lock_type = dlm_req->lock_desc.l_resource.lr_type;
975 op = PTLRPC_LAST_CNTR + LDLM_PLAIN_ENQUEUE;
978 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT)
979 op = PTLRPC_LAST_CNTR + LDLM_GLIMPSE_ENQUEUE;
981 op = PTLRPC_LAST_CNTR + LDLM_EXTENT_ENQUEUE;
984 op = PTLRPC_LAST_CNTR + LDLM_FLOCK_ENQUEUE;
987 op = PTLRPC_LAST_CNTR + LDLM_IBITS_ENQUEUE;
995 lprocfs_counter_incr(srv_stats, op);
1001 * Main server-side entry point into LDLM. This is called by ptlrpc service
1002 * threads to carry out client lock enqueueing requests.
1004 int ldlm_handle_enqueue0(struct ldlm_namespace *ns,
1005 struct ptlrpc_request *req,
1006 const struct ldlm_request *dlm_req,
1007 const struct ldlm_callback_suite *cbs)
1009 struct ldlm_reply *dlm_rep;
1011 ldlm_error_t err = ELDLM_OK;
1012 struct ldlm_lock *lock = NULL;
1013 void *cookie = NULL;
1017 LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
1019 ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF);
1020 flags = dlm_req->lock_flags;
1022 LASSERT(req->rq_export);
1024 if (req->rq_rqbd->rqbd_service->srv_stats)
1025 ldlm_svc_get_eopc(dlm_req,
1026 req->rq_rqbd->rqbd_service->srv_stats);
1028 if (req->rq_export && req->rq_export->exp_nid_stats &&
1029 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1030 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1031 LDLM_ENQUEUE - LDLM_FIRST_OPC);
1033 if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE ||
1034 dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) {
1035 DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
1036 dlm_req->lock_desc.l_resource.lr_type);
1037 GOTO(out, rc = -EFAULT);
1040 if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE ||
1041 dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE ||
1042 dlm_req->lock_desc.l_req_mode &
1043 (dlm_req->lock_desc.l_req_mode-1))) {
1044 DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
1045 dlm_req->lock_desc.l_req_mode);
1046 GOTO(out, rc = -EFAULT);
1049 if (req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) {
1050 if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1052 DEBUG_REQ(D_ERROR, req,
1053 "PLAIN lock request from IBITS client?");
1054 GOTO(out, rc = -EPROTO);
1056 } else if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1058 DEBUG_REQ(D_ERROR, req,
1059 "IBITS lock request from unaware client?");
1060 GOTO(out, rc = -EPROTO);
1064 /* FIXME this makes it impossible to use LDLM_PLAIN locks -- check
1065 against server's _CONNECT_SUPPORTED flags? (I don't want to use
1066 ibits for mgc/mgs) */
1068 /* INODEBITS_INTEROP: Perform conversion from plain lock to
1069 * inodebits lock if client does not support them. */
1070 if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) &&
1071 (dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN)) {
1072 dlm_req->lock_desc.l_resource.lr_type = LDLM_IBITS;
1073 dlm_req->lock_desc.l_policy_data.l_inodebits.bits =
1074 MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE;
1075 if (dlm_req->lock_desc.l_req_mode == LCK_PR)
1076 dlm_req->lock_desc.l_req_mode = LCK_CR;
1080 if (unlikely(flags & LDLM_FL_REPLAY)) {
1081 /* Find an existing lock in the per-export lock hash */
1082 lock = cfs_hash_lookup(req->rq_export->exp_lock_hash,
1083 (void *)&dlm_req->lock_handle[0]);
1085 DEBUG_REQ(D_DLMTRACE, req, "found existing lock cookie "
1086 LPX64, lock->l_handle.h_cookie);
1087 GOTO(existing_lock, rc = 0);
1091 /* The lock's callback data might be set in the policy function */
1092 lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
1093 dlm_req->lock_desc.l_resource.lr_type,
1094 dlm_req->lock_desc.l_req_mode,
1098 GOTO(out, rc = -ENOMEM);
1100 lock->l_last_activity = cfs_time_current_sec();
1101 lock->l_remote_handle = dlm_req->lock_handle[0];
1102 LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
1104 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
1105 /* Don't enqueue a lock onto the export if it has already
1106 * been evicted. Cancel it now instead. (bug 3822) */
1107 if (req->rq_export->exp_failed) {
1108 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1109 GOTO(out, rc = -ENOTCONN);
1112 lock->l_export = class_export_lock_get(req->rq_export, lock);
1113 if (lock->l_export->exp_lock_hash)
1114 cfs_hash_add(lock->l_export->exp_lock_hash,
1115 &lock->l_remote_handle,
1120 if (flags & LDLM_FL_HAS_INTENT) {
1121 /* In this case, the reply buffer is allocated deep in
1122 * local_lock_enqueue by the policy function. */
1125 lock_res_and_lock(lock);
1126 if (lock->l_resource->lr_lvb_len) {
1127 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
1129 lock->l_resource->lr_lvb_len);
1131 unlock_res_and_lock(lock);
1133 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
1134 GOTO(out, rc = -ENOMEM);
1136 rc = req_capsule_server_pack(&req->rq_pill);
1141 if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN)
1142 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1143 if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
1144 lock->l_req_extent = lock->l_policy_data.l_extent;
1146 err = ldlm_lock_enqueue(ns, &lock, cookie, (int *)&flags);
1150 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1151 dlm_rep->lock_flags = flags;
1153 ldlm_lock2desc(lock, &dlm_rep->lock_desc);
1154 ldlm_lock2handle(lock, &dlm_rep->lock_handle);
1156 /* We never send a blocking AST until the lock is granted, but
1157 * we can tell it right now */
1158 lock_res_and_lock(lock);
1160 /* Now take into account flags to be inherited from original lock
1161 request both in reply to client and in our own lock flags. */
1162 dlm_rep->lock_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1163 lock->l_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1165 /* Don't move a pending lock onto the export if it has already
1166 * been evicted. Cancel it now instead. (bug 5683) */
1167 if (unlikely(req->rq_export->exp_failed ||
1168 OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
1169 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1171 } else if (lock->l_flags & LDLM_FL_AST_SENT) {
1172 dlm_rep->lock_flags |= LDLM_FL_AST_SENT;
1173 if (lock->l_granted_mode == lock->l_req_mode) {
1175 * Only cancel lock if it was granted, because it would
1176 * be destroyed immediately and would never be granted
1177 * in the future, causing timeouts on client. Not
1178 * granted lock will be cancelled immediately after
1179 * sending completion AST.
1181 if (dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1182 unlock_res_and_lock(lock);
1183 ldlm_lock_cancel(lock);
1184 lock_res_and_lock(lock);
1186 ldlm_add_waiting_lock(lock);
1189 /* Make sure we never ever grant usual metadata locks to liblustre
1191 if ((dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN ||
1192 dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) &&
1193 req->rq_export->exp_libclient) {
1194 if (unlikely(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) ||
1195 !(dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK))){
1196 CERROR("Granting sync lock to libclient. "
1197 "req fl %d, rep fl %d, lock fl "LPX64"\n",
1198 dlm_req->lock_flags, dlm_rep->lock_flags,
1200 LDLM_ERROR(lock, "sync lock");
1201 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT) {
1202 struct ldlm_intent *it;
1204 it = req_capsule_client_get(&req->rq_pill,
1207 CERROR("This is intent %s ("LPU64")\n",
1208 ldlm_it2str(it->opc), it->opc);
1214 unlock_res_and_lock(lock);
1218 req->rq_status = rc ?: err; /* return either error - bug 11190 */
1219 if (!req->rq_packed_final) {
1220 err = lustre_pack_reply(req, 1, NULL, NULL);
1225 /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
1226 * ldlm_reprocess_all. If this moves, revisit that code. -phil */
1228 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
1229 "(err=%d, rc=%d)", err, rc);
1231 lock_res_and_lock(lock);
1233 if (lock->l_resource->lr_lvb_len > 0) {
1236 lvb = req_capsule_server_get(&req->rq_pill,
1238 LASSERTF(lvb != NULL, "req %p, lock %p\n",
1241 memcpy(lvb, lock->l_resource->lr_lvb_data,
1242 lock->l_resource->lr_lvb_len);
1245 ldlm_resource_unlink_lock(lock);
1246 ldlm_lock_destroy_nolock(lock);
1248 unlock_res_and_lock(lock);
1250 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
1251 ldlm_reprocess_all(lock->l_resource);
1253 LDLM_LOCK_RELEASE(lock);
1256 LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
1262 int ldlm_handle_enqueue(struct ptlrpc_request *req,
1263 ldlm_completion_callback completion_callback,
1264 ldlm_blocking_callback blocking_callback,
1265 ldlm_glimpse_callback glimpse_callback)
1267 struct ldlm_request *dlm_req;
1268 struct ldlm_callback_suite cbs = {
1269 .lcs_completion = completion_callback,
1270 .lcs_blocking = blocking_callback,
1271 .lcs_glimpse = glimpse_callback
1275 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1276 if (dlm_req != NULL) {
1277 rc = ldlm_handle_enqueue0(req->rq_export->exp_obd->obd_namespace,
1278 req, dlm_req, &cbs);
1285 int ldlm_handle_convert0(struct ptlrpc_request *req,
1286 const struct ldlm_request *dlm_req)
1288 struct ldlm_reply *dlm_rep;
1289 struct ldlm_lock *lock;
1293 if (req->rq_export && req->rq_export->exp_nid_stats &&
1294 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1295 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1296 LDLM_CONVERT - LDLM_FIRST_OPC);
1298 rc = req_capsule_server_pack(&req->rq_pill);
1302 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1303 dlm_rep->lock_flags = dlm_req->lock_flags;
1305 lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
1307 req->rq_status = EINVAL;
1311 LDLM_DEBUG(lock, "server-side convert handler START");
1313 lock->l_last_activity = cfs_time_current_sec();
1314 res = ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
1315 &dlm_rep->lock_flags);
1317 if (ldlm_del_waiting_lock(lock))
1318 LDLM_DEBUG(lock, "converted waiting lock");
1321 req->rq_status = EDEADLOCK;
1326 if (!req->rq_status)
1327 ldlm_reprocess_all(lock->l_resource);
1328 LDLM_DEBUG(lock, "server-side convert handler END");
1329 LDLM_LOCK_PUT(lock);
1331 LDLM_DEBUG_NOLOCK("server-side convert handler END");
1336 int ldlm_handle_convert(struct ptlrpc_request *req)
1339 struct ldlm_request *dlm_req;
1341 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1342 if (dlm_req != NULL) {
1343 rc = ldlm_handle_convert0(req, dlm_req);
1345 CERROR ("Can't unpack dlm_req\n");
1351 /* Cancel all the locks whos handles are packed into ldlm_request */
1352 int ldlm_request_cancel(struct ptlrpc_request *req,
1353 const struct ldlm_request *dlm_req, int first)
1355 struct ldlm_resource *res, *pres = NULL;
1356 struct ldlm_lock *lock;
1357 int i, count, done = 0;
1360 count = dlm_req->lock_count ? dlm_req->lock_count : 1;
1364 /* There is no lock on the server at the replay time,
1365 * skip lock cancelling to make replay tests to pass. */
1366 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1369 LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, "
1370 "starting at %d", count, first);
1372 for (i = first; i < count; i++) {
1373 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
1375 LDLM_DEBUG_NOLOCK("server-side cancel handler stale "
1376 "lock (cookie "LPU64")",
1377 dlm_req->lock_handle[i].cookie);
1381 res = lock->l_resource;
1386 ldlm_reprocess_all(pres);
1387 LDLM_RESOURCE_DELREF(pres);
1388 ldlm_resource_putref(pres);
1391 ldlm_resource_getref(res);
1392 LDLM_RESOURCE_ADDREF(res);
1393 ldlm_res_lvbo_update(res, NULL, 1);
1397 ldlm_lock_cancel(lock);
1398 LDLM_LOCK_PUT(lock);
1401 ldlm_reprocess_all(pres);
1402 LDLM_RESOURCE_DELREF(pres);
1403 ldlm_resource_putref(pres);
1405 LDLM_DEBUG_NOLOCK("server-side cancel handler END");
1409 int ldlm_handle_cancel(struct ptlrpc_request *req)
1411 struct ldlm_request *dlm_req;
1415 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1416 if (dlm_req == NULL) {
1417 CDEBUG(D_INFO, "bad request buffer for cancel\n");
1421 if (req->rq_export && req->rq_export->exp_nid_stats &&
1422 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1423 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1424 LDLM_CANCEL - LDLM_FIRST_OPC);
1426 rc = req_capsule_server_pack(&req->rq_pill);
1430 if (!ldlm_request_cancel(req, dlm_req, 0))
1431 req->rq_status = ESTALE;
1433 if (ptlrpc_reply(req) != 0)
1439 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
1440 struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1445 LDLM_DEBUG(lock, "client blocking AST callback handler START");
1447 lock_res_and_lock(lock);
1448 lock->l_flags |= LDLM_FL_CBPENDING;
1450 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
1451 lock->l_flags |= LDLM_FL_CANCEL;
1453 do_ast = (!lock->l_readers && !lock->l_writers);
1454 unlock_res_and_lock(lock);
1457 LDLM_DEBUG(lock, "already unused, calling "
1458 "callback (%p)", lock->l_blocking_ast);
1459 if (lock->l_blocking_ast != NULL)
1460 lock->l_blocking_ast(lock, ld, lock->l_ast_data,
1463 LDLM_DEBUG(lock, "Lock still has references, will be"
1464 " cancelled later");
1467 LDLM_DEBUG(lock, "client blocking callback handler END");
1468 LDLM_LOCK_RELEASE(lock);
1472 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
1473 struct ldlm_namespace *ns,
1474 struct ldlm_request *dlm_req,
1475 struct ldlm_lock *lock)
1477 CFS_LIST_HEAD(ast_list);
1480 LDLM_DEBUG(lock, "client completion callback handler START");
1482 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) {
1483 int to = cfs_time_seconds(1);
1485 cfs_schedule_timeout(CFS_TASK_INTERRUPTIBLE, to);
1486 if (lock->l_granted_mode == lock->l_req_mode ||
1492 lock_res_and_lock(lock);
1493 if (lock->l_destroyed ||
1494 lock->l_granted_mode == lock->l_req_mode) {
1495 /* bug 11300: the lock has already been granted */
1496 unlock_res_and_lock(lock);
1497 LDLM_DEBUG(lock, "Double grant race happened");
1498 LDLM_LOCK_RELEASE(lock);
1503 /* If we receive the completion AST before the actual enqueue returned,
1504 * then we might need to switch lock modes, resources, or extents. */
1505 if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
1506 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
1507 LDLM_DEBUG(lock, "completion AST, new lock mode");
1510 if (lock->l_resource->lr_type != LDLM_PLAIN) {
1511 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1512 LDLM_DEBUG(lock, "completion AST, new policy data");
1515 ldlm_resource_unlink_lock(lock);
1516 if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
1517 &lock->l_resource->lr_name,
1518 sizeof(lock->l_resource->lr_name)) != 0) {
1519 unlock_res_and_lock(lock);
1520 if (ldlm_lock_change_resource(ns, lock,
1521 &dlm_req->lock_desc.l_resource.lr_name) != 0) {
1522 LDLM_ERROR(lock, "Failed to allocate resource");
1523 LDLM_LOCK_RELEASE(lock);
1527 LDLM_DEBUG(lock, "completion AST, new resource");
1528 CERROR("change resource!\n");
1529 lock_res_and_lock(lock);
1532 if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
1533 /* BL_AST locks are not needed in lru.
1534 * let ldlm_cancel_lru() be fast. */
1535 ldlm_lock_remove_from_lru(lock);
1536 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
1537 LDLM_DEBUG(lock, "completion AST includes blocking AST");
1540 if (lock->l_lvb_len) {
1541 if (req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB,
1542 RCL_CLIENT) < lock->l_lvb_len) {
1543 LDLM_ERROR(lock, "completion AST did not contain "
1546 void *lvb = req_capsule_client_get(&req->rq_pill,
1548 memcpy(lock->l_lvb_data, lvb, lock->l_lvb_len);
1552 ldlm_grant_lock(lock, &ast_list);
1553 unlock_res_and_lock(lock);
1555 LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
1557 ldlm_run_ast_work(&ast_list, LDLM_WORK_CP_AST);
1559 LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
1561 LDLM_LOCK_RELEASE(lock);
1565 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
1566 struct ldlm_namespace *ns,
1567 struct ldlm_request *dlm_req,
1568 struct ldlm_lock *lock)
1573 LDLM_DEBUG(lock, "client glimpse AST callback handler");
1575 if (lock->l_glimpse_ast != NULL)
1576 rc = lock->l_glimpse_ast(lock, req);
1578 if (req->rq_repmsg != NULL) {
1581 req->rq_status = rc;
1585 lock_res_and_lock(lock);
1586 if (lock->l_granted_mode == LCK_PW &&
1587 !lock->l_readers && !lock->l_writers &&
1588 cfs_time_after(cfs_time_current(),
1589 cfs_time_add(lock->l_last_used,
1590 cfs_time_seconds(10)))) {
1591 unlock_res_and_lock(lock);
1592 if (ldlm_bl_to_thread_lock(ns, NULL, lock))
1593 ldlm_handle_bl_callback(ns, NULL, lock);
1598 unlock_res_and_lock(lock);
1599 LDLM_LOCK_RELEASE(lock);
1603 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1605 if (req->rq_no_reply)
1608 req->rq_status = rc;
1609 if (!req->rq_packed_final) {
1610 rc = lustre_pack_reply(req, 1, NULL, NULL);
1614 return ptlrpc_reply(req);
1618 static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
1619 struct ldlm_lock_desc *ld, struct ldlm_lock *lock,
1620 struct list_head *cancels, int count)
1622 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1623 struct ldlm_bl_work_item *blwi;
1626 if (cancels && count == 0)
1629 OBD_ALLOC(blwi, sizeof(*blwi));
1635 blwi->blwi_ld = *ld;
1637 list_add(&blwi->blwi_head, cancels);
1638 list_del_init(cancels);
1639 blwi->blwi_count = count;
1641 blwi->blwi_lock = lock;
1643 spin_lock(&blp->blp_lock);
1644 if (lock && lock->l_flags & LDLM_FL_DISCARD_DATA) {
1645 /* add LDLM_FL_DISCARD_DATA requests to the priority list */
1646 list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
1648 /* other blocking callbacks are added to the regular list */
1649 list_add_tail(&blwi->blwi_entry, &blp->blp_list);
1651 cfs_waitq_signal(&blp->blp_waitq);
1652 spin_unlock(&blp->blp_lock);
1658 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1659 struct ldlm_lock *lock)
1662 RETURN(ldlm_bl_to_thread(ns, ld, lock, NULL, 0));
1668 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1669 struct list_head *cancels, int count)
1672 RETURN(ldlm_bl_to_thread(ns, ld, NULL, cancels, count));
1678 /* Setinfo coming from Server (eg MDT) to Client (eg MDC)! */
1679 static int ldlm_handle_setinfo(struct ptlrpc_request *req)
1681 struct obd_device *obd = req->rq_export->exp_obd;
1688 DEBUG_REQ(D_ERROR, req, "%s: handle setinfo\n", obd->obd_name);
1690 req_capsule_set(&req->rq_pill, &RQF_OBD_SET_INFO);
1692 key = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
1694 DEBUG_REQ(D_IOCTL, req, "no set_info key");
1697 keylen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_KEY,
1699 val = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
1701 DEBUG_REQ(D_IOCTL, req, "no set_info val");
1704 vallen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_VAL,
1707 /* We are responsible for swabbing contents of val */
1709 if (KEY_IS(KEY_HSM_COPYTOOL_SEND))
1710 /* Pass it on to mdc (the "export" in this case) */
1711 rc = obd_set_info_async(req->rq_export,
1712 sizeof(KEY_HSM_COPYTOOL_SEND),
1713 KEY_HSM_COPYTOOL_SEND,
1716 DEBUG_REQ(D_WARNING, req, "ignoring unknown key %s", key);
1721 /* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */
1722 static int ldlm_callback_handler(struct ptlrpc_request *req)
1724 struct ldlm_namespace *ns;
1725 struct ldlm_request *dlm_req;
1726 struct ldlm_lock *lock;
1730 /* Requests arrive in sender's byte order. The ptlrpc service
1731 * handler has already checked and, if necessary, byte-swapped the
1732 * incoming request message body, but I am responsible for the
1733 * message buffers. */
1735 /* do nothing for sec context finalize */
1736 if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI)
1739 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
1741 if (req->rq_export == NULL) {
1742 ldlm_callback_reply(req, -ENOTCONN);
1746 LASSERT(req->rq_export != NULL);
1747 LASSERT(req->rq_export->exp_obd != NULL);
1749 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1750 case LDLM_BL_CALLBACK:
1751 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK))
1754 case LDLM_CP_CALLBACK:
1755 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK))
1758 case LDLM_GL_CALLBACK:
1759 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK))
1763 rc = ldlm_handle_setinfo(req);
1764 ldlm_callback_reply(req, rc);
1766 case OBD_LOG_CANCEL: /* remove this eventually - for 1.4.0 compat */
1767 CERROR("shouldn't be handling OBD_LOG_CANCEL on DLM thread\n");
1768 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
1769 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
1771 rc = llog_origin_handle_cancel(req);
1772 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_REP))
1774 ldlm_callback_reply(req, rc);
1776 case OBD_QC_CALLBACK:
1777 req_capsule_set(&req->rq_pill, &RQF_QC_CALLBACK);
1778 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_QC_CALLBACK_NET))
1780 rc = target_handle_qc_callback(req);
1781 ldlm_callback_reply(req, rc);
1785 /* reply in handler */
1786 req_capsule_set(&req->rq_pill, &RQF_MDS_QUOTA_DQACQ);
1787 rc = target_handle_dqacq_callback(req);
1789 case LLOG_ORIGIN_HANDLE_CREATE:
1790 req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
1791 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1793 rc = llog_origin_handle_create(req);
1794 ldlm_callback_reply(req, rc);
1796 case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
1797 req_capsule_set(&req->rq_pill,
1798 &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
1799 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1801 rc = llog_origin_handle_next_block(req);
1802 ldlm_callback_reply(req, rc);
1804 case LLOG_ORIGIN_HANDLE_READ_HEADER:
1805 req_capsule_set(&req->rq_pill,
1806 &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER);
1807 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1809 rc = llog_origin_handle_read_header(req);
1810 ldlm_callback_reply(req, rc);
1812 case LLOG_ORIGIN_HANDLE_CLOSE:
1813 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1815 rc = llog_origin_handle_close(req);
1816 ldlm_callback_reply(req, rc);
1819 CERROR("unknown opcode %u\n",
1820 lustre_msg_get_opc(req->rq_reqmsg));
1821 ldlm_callback_reply(req, -EPROTO);
1825 ns = req->rq_export->exp_obd->obd_namespace;
1826 LASSERT(ns != NULL);
1828 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1830 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1831 if (dlm_req == NULL) {
1832 ldlm_callback_reply(req, -EPROTO);
1836 /* Force a known safe race, send a cancel to the server for a lock
1837 * which the server has already started a blocking callback on. */
1838 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE) &&
1839 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1840 rc = ldlm_cli_cancel(&dlm_req->lock_handle[0]);
1842 CERROR("ldlm_cli_cancel: %d\n", rc);
1845 lock = ldlm_handle2lock_long(&dlm_req->lock_handle[0], 0);
1847 CDEBUG(D_DLMTRACE, "callback on lock "LPX64" - lock "
1848 "disappeared\n", dlm_req->lock_handle[0].cookie);
1849 ldlm_callback_reply(req, -EINVAL);
1853 if ((lock->l_flags & LDLM_FL_FAIL_LOC) &&
1854 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK)
1855 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
1857 /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
1858 lock_res_and_lock(lock);
1859 lock->l_flags |= (dlm_req->lock_flags & LDLM_AST_FLAGS);
1860 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1861 /* If somebody cancels lock and cache is already dropped,
1862 * or lock is failed before cp_ast received on client,
1863 * we can tell the server we have no lock. Otherwise, we
1864 * should send cancel after dropping the cache. */
1865 if (((lock->l_flags & LDLM_FL_CANCELING) &&
1866 (lock->l_flags & LDLM_FL_BL_DONE)) ||
1867 (lock->l_flags & LDLM_FL_FAILED)) {
1868 LDLM_DEBUG(lock, "callback on lock "
1869 LPX64" - lock disappeared\n",
1870 dlm_req->lock_handle[0].cookie);
1871 unlock_res_and_lock(lock);
1872 LDLM_LOCK_RELEASE(lock);
1873 ldlm_callback_reply(req, -EINVAL);
1876 /* BL_AST locks are not needed in lru.
1877 * let ldlm_cancel_lru() be fast. */
1878 ldlm_lock_remove_from_lru(lock);
1879 lock->l_flags |= LDLM_FL_BL_AST;
1881 unlock_res_and_lock(lock);
1883 /* We want the ost thread to get this reply so that it can respond
1884 * to ost requests (write cache writeback) that might be triggered
1887 * But we'd also like to be able to indicate in the reply that we're
1888 * cancelling right now, because it's unused, or have an intent result
1889 * in the reply, so we might have to push the responsibility for sending
1890 * the reply down into the AST handlers, alas. */
1892 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1893 case LDLM_BL_CALLBACK:
1894 CDEBUG(D_INODE, "blocking ast\n");
1895 req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
1896 if (!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK))
1897 ldlm_callback_reply(req, 0);
1898 if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
1899 ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
1901 case LDLM_CP_CALLBACK:
1902 CDEBUG(D_INODE, "completion ast\n");
1903 req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
1904 ldlm_callback_reply(req, 0);
1905 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
1907 case LDLM_GL_CALLBACK:
1908 CDEBUG(D_INODE, "glimpse ast\n");
1909 req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
1910 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
1913 LBUG(); /* checked above */
1919 static int ldlm_cancel_handler(struct ptlrpc_request *req)
1924 /* Requests arrive in sender's byte order. The ptlrpc service
1925 * handler has already checked and, if necessary, byte-swapped the
1926 * incoming request message body, but I am responsible for the
1927 * message buffers. */
1929 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
1931 if (req->rq_export == NULL) {
1932 struct ldlm_request *dlm_req;
1934 CERROR("operation %d from %s with bad export cookie "LPU64"\n",
1935 lustre_msg_get_opc(req->rq_reqmsg),
1936 libcfs_id2str(req->rq_peer),
1937 lustre_msg_get_handle(req->rq_reqmsg)->cookie);
1939 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_CANCEL) {
1940 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1941 dlm_req = req_capsule_client_get(&req->rq_pill,
1943 if (dlm_req != NULL)
1944 ldlm_lock_dump_handle(D_ERROR,
1945 &dlm_req->lock_handle[0]);
1947 ldlm_callback_reply(req, -ENOTCONN);
1951 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1953 /* XXX FIXME move this back to mds/handler.c, bug 249 */
1955 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
1956 CDEBUG(D_INODE, "cancel\n");
1957 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL))
1959 rc = ldlm_handle_cancel(req);
1963 case OBD_LOG_CANCEL:
1964 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
1965 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
1967 rc = llog_origin_handle_cancel(req);
1968 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_REP))
1970 ldlm_callback_reply(req, rc);
1973 CERROR("invalid opcode %d\n",
1974 lustre_msg_get_opc(req->rq_reqmsg));
1975 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1976 ldlm_callback_reply(req, -EINVAL);
1982 void ldlm_revoke_lock_cb(void *obj, void *data)
1984 struct list_head *rpc_list = data;
1985 struct ldlm_lock *lock = obj;
1987 lock_res_and_lock(lock);
1989 if (lock->l_req_mode != lock->l_granted_mode) {
1990 unlock_res_and_lock(lock);
1994 LASSERT(lock->l_resource);
1995 if (lock->l_resource->lr_type != LDLM_IBITS &&
1996 lock->l_resource->lr_type != LDLM_PLAIN) {
1997 unlock_res_and_lock(lock);
2001 if (lock->l_flags & LDLM_FL_AST_SENT) {
2002 unlock_res_and_lock(lock);
2006 LASSERT(lock->l_blocking_ast);
2007 LASSERT(!lock->l_blocking_lock);
2009 lock->l_flags |= LDLM_FL_AST_SENT;
2010 if (lock->l_export && lock->l_export->exp_lock_hash &&
2011 !hlist_unhashed(&lock->l_exp_hash))
2012 cfs_hash_del(lock->l_export->exp_lock_hash,
2013 &lock->l_remote_handle, &lock->l_exp_hash);
2014 list_add_tail(&lock->l_rk_ast, rpc_list);
2015 LDLM_LOCK_GET(lock);
2017 unlock_res_and_lock(lock);
2020 void ldlm_revoke_export_locks(struct obd_export *exp)
2022 struct list_head rpc_list;
2025 CFS_INIT_LIST_HEAD(&rpc_list);
2026 cfs_hash_for_each_empty(exp->exp_lock_hash,
2027 ldlm_revoke_lock_cb, &rpc_list);
2028 ldlm_run_ast_work(&rpc_list, LDLM_WORK_REVOKE_AST);
2034 static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp)
2036 struct ldlm_bl_work_item *blwi = NULL;
2037 static unsigned int num_bl = 0;
2039 spin_lock(&blp->blp_lock);
2040 /* process a request from the blp_list at least every blp_num_threads */
2041 if (!list_empty(&blp->blp_list) &&
2042 (list_empty(&blp->blp_prio_list) || num_bl == 0))
2043 blwi = list_entry(blp->blp_list.next,
2044 struct ldlm_bl_work_item, blwi_entry);
2046 if (!list_empty(&blp->blp_prio_list))
2047 blwi = list_entry(blp->blp_prio_list.next,
2048 struct ldlm_bl_work_item, blwi_entry);
2051 if (++num_bl >= atomic_read(&blp->blp_num_threads))
2053 list_del(&blwi->blwi_entry);
2055 spin_unlock(&blp->blp_lock);
2060 /* This only contains temporary data until the thread starts */
2061 struct ldlm_bl_thread_data {
2062 char bltd_name[CFS_CURPROC_COMM_MAX];
2063 struct ldlm_bl_pool *bltd_blp;
2064 struct completion bltd_comp;
2068 static int ldlm_bl_thread_main(void *arg);
2070 static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp)
2072 struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
2075 init_completion(&bltd.bltd_comp);
2076 rc = cfs_kernel_thread(ldlm_bl_thread_main, &bltd, 0);
2078 CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %d\n",
2079 atomic_read(&blp->blp_num_threads), rc);
2082 wait_for_completion(&bltd.bltd_comp);
2087 static int ldlm_bl_thread_main(void *arg)
2089 struct ldlm_bl_pool *blp;
2093 struct ldlm_bl_thread_data *bltd = arg;
2095 blp = bltd->bltd_blp;
2097 bltd->bltd_num = atomic_inc_return(&blp->blp_num_threads) - 1;
2098 atomic_inc(&blp->blp_busy_threads);
2100 snprintf(bltd->bltd_name, sizeof(bltd->bltd_name) - 1,
2101 "ldlm_bl_%02d", bltd->bltd_num);
2102 cfs_daemonize(bltd->bltd_name);
2104 complete(&bltd->bltd_comp);
2105 /* cannot use bltd after this, it is only on caller's stack */
2109 struct l_wait_info lwi = { 0 };
2110 struct ldlm_bl_work_item *blwi = NULL;
2112 blwi = ldlm_bl_get_work(blp);
2117 atomic_dec(&blp->blp_busy_threads);
2118 l_wait_event_exclusive(blp->blp_waitq,
2119 (blwi = ldlm_bl_get_work(blp)) != NULL,
2121 busy = atomic_inc_return(&blp->blp_busy_threads);
2123 if (blwi->blwi_ns == NULL)
2124 /* added by ldlm_cleanup() */
2127 /* Not fatal if racy and have a few too many threads */
2128 if (unlikely(busy < blp->blp_max_threads &&
2129 busy >= atomic_read(&blp->blp_num_threads)))
2130 /* discard the return value, we tried */
2131 ldlm_bl_thread_start(blp);
2133 if (blwi->blwi_ns == NULL)
2134 /* added by ldlm_cleanup() */
2138 if (blwi->blwi_count) {
2139 /* The special case when we cancel locks in lru
2140 * asynchronously, we pass the list of locks here.
2141 * Thus lock is marked LDLM_FL_CANCELING, and already
2142 * canceled locally. */
2143 ldlm_cli_cancel_list(&blwi->blwi_head,
2144 blwi->blwi_count, NULL, 0);
2146 ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
2149 OBD_FREE(blwi, sizeof(*blwi));
2152 atomic_dec(&blp->blp_busy_threads);
2153 atomic_dec(&blp->blp_num_threads);
2154 complete(&blp->blp_comp);
2160 static int ldlm_setup(void);
2161 static int ldlm_cleanup(void);
2163 int ldlm_get_ref(void)
2167 mutex_down(&ldlm_ref_sem);
2168 if (++ldlm_refcount == 1) {
2173 mutex_up(&ldlm_ref_sem);
2178 void ldlm_put_ref(void)
2181 mutex_down(&ldlm_ref_sem);
2182 if (ldlm_refcount == 1) {
2183 int rc = ldlm_cleanup();
2185 CERROR("ldlm_cleanup failed: %d\n", rc);
2191 mutex_up(&ldlm_ref_sem);
2197 * Export handle<->lock hash operations.
2200 ldlm_export_lock_hash(cfs_hash_t *hs, void *key, unsigned mask)
2202 return cfs_hash_u64_hash(((struct lustre_handle *)key)->cookie, mask);
2206 ldlm_export_lock_key(struct hlist_node *hnode)
2208 struct ldlm_lock *lock;
2211 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2212 RETURN(&lock->l_remote_handle);
2216 ldlm_export_lock_compare(void *key, struct hlist_node *hnode)
2219 RETURN(lustre_handle_equal(ldlm_export_lock_key(hnode), key));
2223 ldlm_export_lock_get(struct hlist_node *hnode)
2225 struct ldlm_lock *lock;
2228 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2229 LDLM_LOCK_GET(lock);
2235 ldlm_export_lock_put(struct hlist_node *hnode)
2237 struct ldlm_lock *lock;
2240 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2241 LDLM_LOCK_RELEASE(lock);
2246 static cfs_hash_ops_t ldlm_export_lock_ops = {
2247 .hs_hash = ldlm_export_lock_hash,
2248 .hs_key = ldlm_export_lock_key,
2249 .hs_compare = ldlm_export_lock_compare,
2250 .hs_get = ldlm_export_lock_get,
2251 .hs_put = ldlm_export_lock_put
2254 int ldlm_init_export(struct obd_export *exp)
2258 exp->exp_lock_hash =
2259 cfs_hash_create(obd_uuid2str(&exp->exp_client_uuid),
2260 HASH_EXP_LOCK_CUR_BITS, HASH_EXP_LOCK_MAX_BITS,
2261 &ldlm_export_lock_ops, CFS_HASH_REHASH);
2263 if (!exp->exp_lock_hash)
2268 EXPORT_SYMBOL(ldlm_init_export);
2270 void ldlm_destroy_export(struct obd_export *exp)
2273 cfs_hash_destroy(exp->exp_lock_hash);
2274 exp->exp_lock_hash = NULL;
2277 EXPORT_SYMBOL(ldlm_destroy_export);
2279 static int ldlm_setup(void)
2281 struct ldlm_bl_pool *blp;
2283 int ldlm_min_threads = LDLM_THREADS_AUTO_MIN;
2284 int ldlm_max_threads = LDLM_THREADS_AUTO_MAX;
2290 if (ldlm_state != NULL)
2293 OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
2294 if (ldlm_state == NULL)
2298 rc = ldlm_proc_setup();
2304 if (ldlm_num_threads) {
2305 /* If ldlm_num_threads is set, it is the min and the max. */
2306 if (ldlm_num_threads > LDLM_THREADS_AUTO_MAX)
2307 ldlm_num_threads = LDLM_THREADS_AUTO_MAX;
2308 if (ldlm_num_threads < LDLM_THREADS_AUTO_MIN)
2309 ldlm_num_threads = LDLM_THREADS_AUTO_MIN;
2310 ldlm_min_threads = ldlm_max_threads = ldlm_num_threads;
2314 ldlm_state->ldlm_cb_service =
2315 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2316 LDLM_MAXREPSIZE, LDLM_CB_REQUEST_PORTAL,
2317 LDLM_CB_REPLY_PORTAL, 2,
2318 ldlm_callback_handler, "ldlm_cbd",
2319 ldlm_svc_proc_dir, NULL,
2320 ldlm_min_threads, ldlm_max_threads,
2322 LCT_MD_THREAD|LCT_DT_THREAD, NULL);
2324 if (!ldlm_state->ldlm_cb_service) {
2325 CERROR("failed to start service\n");
2326 GOTO(out_proc, rc = -ENOMEM);
2329 ldlm_state->ldlm_cancel_service =
2330 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2331 LDLM_MAXREPSIZE, LDLM_CANCEL_REQUEST_PORTAL,
2332 LDLM_CANCEL_REPLY_PORTAL, 6,
2333 ldlm_cancel_handler, "ldlm_canceld",
2334 ldlm_svc_proc_dir, NULL,
2335 ldlm_min_threads, ldlm_max_threads,
2337 LCT_MD_THREAD|LCT_DT_THREAD|LCT_CL_THREAD,
2340 if (!ldlm_state->ldlm_cancel_service) {
2341 CERROR("failed to start service\n");
2342 GOTO(out_proc, rc = -ENOMEM);
2345 OBD_ALLOC(blp, sizeof(*blp));
2347 GOTO(out_proc, rc = -ENOMEM);
2348 ldlm_state->ldlm_bl_pool = blp;
2350 spin_lock_init(&blp->blp_lock);
2351 CFS_INIT_LIST_HEAD(&blp->blp_list);
2352 CFS_INIT_LIST_HEAD(&blp->blp_prio_list);
2353 cfs_waitq_init(&blp->blp_waitq);
2354 atomic_set(&blp->blp_num_threads, 0);
2355 atomic_set(&blp->blp_busy_threads, 0);
2356 blp->blp_min_threads = ldlm_min_threads;
2357 blp->blp_max_threads = ldlm_max_threads;
2360 for (i = 0; i < blp->blp_min_threads; i++) {
2361 rc = ldlm_bl_thread_start(blp);
2363 GOTO(out_thread, rc);
2366 rc = ptlrpc_start_threads(NULL, ldlm_state->ldlm_cancel_service);
2368 GOTO(out_thread, rc);
2370 rc = ptlrpc_start_threads(NULL, ldlm_state->ldlm_cb_service);
2372 GOTO(out_thread, rc);
2374 CFS_INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
2375 expired_lock_thread.elt_state = ELT_STOPPED;
2376 cfs_waitq_init(&expired_lock_thread.elt_waitq);
2378 CFS_INIT_LIST_HEAD(&waiting_locks_list);
2379 spin_lock_init(&waiting_locks_spinlock);
2380 cfs_timer_init(&waiting_locks_timer, waiting_locks_callback, 0);
2382 rc = cfs_kernel_thread(expired_lock_main, NULL, CLONE_VM | CLONE_FILES);
2384 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
2385 GOTO(out_thread, rc);
2388 wait_event(expired_lock_thread.elt_waitq,
2389 expired_lock_thread.elt_state == ELT_READY);
2393 rc = ldlm_pools_init();
2395 GOTO(out_thread, rc);
2401 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2402 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2407 ldlm_proc_cleanup();
2410 OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2415 static int ldlm_cleanup(void)
2418 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
2422 if (!list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) ||
2423 !list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) {
2424 CERROR("ldlm still has namespaces; clean these up first.\n");
2425 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
2426 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
2435 while (atomic_read(&blp->blp_num_threads) > 0) {
2436 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
2438 init_completion(&blp->blp_comp);
2440 spin_lock(&blp->blp_lock);
2441 list_add_tail(&blwi.blwi_entry, &blp->blp_list);
2442 cfs_waitq_signal(&blp->blp_waitq);
2443 spin_unlock(&blp->blp_lock);
2445 wait_for_completion(&blp->blp_comp);
2447 OBD_FREE(blp, sizeof(*blp));
2449 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2450 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2451 ldlm_proc_cleanup();
2453 expired_lock_thread.elt_state = ELT_TERMINATE;
2454 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
2455 wait_event(expired_lock_thread.elt_waitq,
2456 expired_lock_thread.elt_state == ELT_STOPPED);
2458 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2459 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2462 OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2468 int __init ldlm_init(void)
2470 init_mutex(&ldlm_ref_sem);
2471 init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER));
2472 init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
2473 ldlm_resource_slab = cfs_mem_cache_create("ldlm_resources",
2474 sizeof(struct ldlm_resource), 0,
2475 SLAB_HWCACHE_ALIGN);
2476 if (ldlm_resource_slab == NULL)
2479 ldlm_lock_slab = cfs_mem_cache_create("ldlm_locks",
2480 sizeof(struct ldlm_lock), 0,
2481 SLAB_HWCACHE_ALIGN | SLAB_DESTROY_BY_RCU);
2482 if (ldlm_lock_slab == NULL) {
2483 cfs_mem_cache_destroy(ldlm_resource_slab);
2487 ldlm_interval_slab = cfs_mem_cache_create("interval_node",
2488 sizeof(struct ldlm_interval),
2489 0, SLAB_HWCACHE_ALIGN);
2490 if (ldlm_interval_slab == NULL) {
2491 cfs_mem_cache_destroy(ldlm_resource_slab);
2492 cfs_mem_cache_destroy(ldlm_lock_slab);
2495 #if LUSTRE_TRACKS_LOCK_EXP_REFS
2496 class_export_dump_hook = ldlm_dump_export_locks;
2501 void __exit ldlm_exit(void)
2505 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
2506 rc = cfs_mem_cache_destroy(ldlm_resource_slab);
2507 LASSERTF(rc == 0, "couldn't free ldlm resource slab\n");
2509 /* ldlm_lock_put() use RCU to call ldlm_lock_free, so need call
2510 * synchronize_rcu() to wait a grace period elapsed, so that
2511 * ldlm_lock_free() get a chance to be called. */
2514 rc = cfs_mem_cache_destroy(ldlm_lock_slab);
2515 LASSERTF(rc == 0, "couldn't free ldlm lock slab\n");
2516 rc = cfs_mem_cache_destroy(ldlm_interval_slab);
2517 LASSERTF(rc == 0, "couldn't free interval node slab\n");
2521 EXPORT_SYMBOL(ldlm_extent_shift_kms);
2524 EXPORT_SYMBOL(ldlm_get_processing_policy);
2525 EXPORT_SYMBOL(ldlm_lock2desc);
2526 EXPORT_SYMBOL(ldlm_register_intent);
2527 EXPORT_SYMBOL(ldlm_lockname);
2528 EXPORT_SYMBOL(ldlm_typename);
2529 EXPORT_SYMBOL(ldlm_lock2handle);
2530 EXPORT_SYMBOL(__ldlm_handle2lock);
2531 EXPORT_SYMBOL(ldlm_lock_get);
2532 EXPORT_SYMBOL(ldlm_lock_put);
2533 EXPORT_SYMBOL(ldlm_lock_match);
2534 EXPORT_SYMBOL(ldlm_lock_cancel);
2535 EXPORT_SYMBOL(ldlm_lock_addref);
2536 EXPORT_SYMBOL(ldlm_lock_addref_try);
2537 EXPORT_SYMBOL(ldlm_lock_decref);
2538 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
2539 EXPORT_SYMBOL(ldlm_lock_change_resource);
2540 EXPORT_SYMBOL(ldlm_it2str);
2541 EXPORT_SYMBOL(ldlm_lock_dump);
2542 EXPORT_SYMBOL(ldlm_lock_dump_handle);
2543 EXPORT_SYMBOL(ldlm_reprocess_all_ns);
2544 EXPORT_SYMBOL(ldlm_lock_allow_match_locked);
2545 EXPORT_SYMBOL(ldlm_lock_allow_match);
2546 EXPORT_SYMBOL(ldlm_lock_downgrade);
2547 EXPORT_SYMBOL(ldlm_lock_convert);
2549 /* ldlm_request.c */
2550 EXPORT_SYMBOL(ldlm_completion_ast_async);
2551 EXPORT_SYMBOL(ldlm_blocking_ast_nocheck);
2552 EXPORT_SYMBOL(ldlm_completion_ast);
2553 EXPORT_SYMBOL(ldlm_blocking_ast);
2554 EXPORT_SYMBOL(ldlm_glimpse_ast);
2555 EXPORT_SYMBOL(ldlm_expired_completion_wait);
2556 EXPORT_SYMBOL(ldlm_prep_enqueue_req);
2557 EXPORT_SYMBOL(ldlm_prep_elc_req);
2558 EXPORT_SYMBOL(ldlm_cli_convert);
2559 EXPORT_SYMBOL(ldlm_cli_enqueue);
2560 EXPORT_SYMBOL(ldlm_cli_enqueue_fini);
2561 EXPORT_SYMBOL(ldlm_cli_enqueue_local);
2562 EXPORT_SYMBOL(ldlm_cli_cancel);
2563 EXPORT_SYMBOL(ldlm_cli_cancel_unused);
2564 EXPORT_SYMBOL(ldlm_cli_cancel_unused_resource);
2565 EXPORT_SYMBOL(ldlm_cli_cancel_req);
2566 EXPORT_SYMBOL(ldlm_replay_locks);
2567 EXPORT_SYMBOL(ldlm_resource_foreach);
2568 EXPORT_SYMBOL(ldlm_namespace_foreach);
2569 EXPORT_SYMBOL(ldlm_namespace_foreach_res);
2570 EXPORT_SYMBOL(ldlm_resource_iterate);
2571 EXPORT_SYMBOL(ldlm_cancel_resource_local);
2572 EXPORT_SYMBOL(ldlm_cli_cancel_list);
2575 EXPORT_SYMBOL(ldlm_server_blocking_ast);
2576 EXPORT_SYMBOL(ldlm_server_completion_ast);
2577 EXPORT_SYMBOL(ldlm_server_glimpse_ast);
2578 EXPORT_SYMBOL(ldlm_handle_enqueue);
2579 EXPORT_SYMBOL(ldlm_handle_enqueue0);
2580 EXPORT_SYMBOL(ldlm_handle_cancel);
2581 EXPORT_SYMBOL(ldlm_request_cancel);
2582 EXPORT_SYMBOL(ldlm_handle_convert);
2583 EXPORT_SYMBOL(ldlm_handle_convert0);
2584 EXPORT_SYMBOL(ldlm_del_waiting_lock);
2585 EXPORT_SYMBOL(ldlm_get_ref);
2586 EXPORT_SYMBOL(ldlm_put_ref);
2587 EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
2588 EXPORT_SYMBOL(ldlm_revoke_export_locks);
2590 /* ldlm_resource.c */
2591 EXPORT_SYMBOL(ldlm_namespace_new);
2592 EXPORT_SYMBOL(ldlm_namespace_cleanup);
2593 EXPORT_SYMBOL(ldlm_namespace_free);
2594 EXPORT_SYMBOL(ldlm_namespace_dump);
2595 EXPORT_SYMBOL(ldlm_dump_all_namespaces);
2596 EXPORT_SYMBOL(ldlm_resource_get);
2597 EXPORT_SYMBOL(ldlm_resource_putref);
2598 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
2601 EXPORT_SYMBOL(client_import_add_conn);
2602 EXPORT_SYMBOL(client_import_del_conn);
2603 EXPORT_SYMBOL(client_obd_setup);
2604 EXPORT_SYMBOL(client_obd_cleanup);
2605 EXPORT_SYMBOL(client_connect_import);
2606 EXPORT_SYMBOL(client_disconnect_export);
2607 EXPORT_SYMBOL(server_disconnect_export);
2608 EXPORT_SYMBOL(target_stop_recovery_thread);
2609 EXPORT_SYMBOL(target_handle_connect);
2610 EXPORT_SYMBOL(target_cleanup_recovery);
2611 EXPORT_SYMBOL(target_destroy_export);
2612 EXPORT_SYMBOL(target_cancel_recovery_timer);
2613 EXPORT_SYMBOL(target_send_reply);
2614 EXPORT_SYMBOL(target_queue_recovery_request);
2615 EXPORT_SYMBOL(target_handle_ping);
2616 EXPORT_SYMBOL(target_pack_pool_reply);
2617 EXPORT_SYMBOL(target_handle_disconnect);
2620 EXPORT_SYMBOL(lock_res_and_lock);
2621 EXPORT_SYMBOL(unlock_res_and_lock);