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 (c) 2002, 2010, Oracle and/or its affiliates. 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 cfs_semaphore_t 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 cfs_spinlock_t waiting_locks_spinlock; /* BH lock (timer) */
90 static cfs_list_t waiting_locks_list;
91 static cfs_timer_t waiting_locks_timer;
93 static struct expired_lock_thread {
94 cfs_waitq_t elt_waitq;
97 cfs_list_t elt_expired_locks;
98 } expired_lock_thread;
101 #define ELT_STOPPED 0
103 #define ELT_TERMINATE 2
105 struct ldlm_bl_pool {
106 cfs_spinlock_t blp_lock;
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 cfs_list_t blp_prio_list;
116 * blp_list is used for all other callbacks which are likely
117 * to take longer to process.
121 cfs_waitq_t blp_waitq;
122 cfs_completion_t blp_comp;
123 cfs_atomic_t blp_num_threads;
124 cfs_atomic_t blp_busy_threads;
129 struct ldlm_bl_work_item {
130 cfs_list_t blwi_entry;
131 struct ldlm_namespace *blwi_ns;
132 struct ldlm_lock_desc blwi_ld;
133 struct ldlm_lock *blwi_lock;
134 cfs_list_t blwi_head;
136 cfs_completion_t blwi_comp;
138 int blwi_mem_pressure;
143 static inline int have_expired_locks(void)
148 cfs_spin_lock_bh(&waiting_locks_spinlock);
149 need_to_run = !cfs_list_empty(&expired_lock_thread.elt_expired_locks);
150 cfs_spin_unlock_bh(&waiting_locks_spinlock);
155 static int expired_lock_main(void *arg)
157 cfs_list_t *expired = &expired_lock_thread.elt_expired_locks;
158 struct l_wait_info lwi = { 0 };
162 cfs_daemonize("ldlm_elt");
164 expired_lock_thread.elt_state = ELT_READY;
165 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
168 l_wait_event(expired_lock_thread.elt_waitq,
169 have_expired_locks() ||
170 expired_lock_thread.elt_state == ELT_TERMINATE,
173 cfs_spin_lock_bh(&waiting_locks_spinlock);
174 if (expired_lock_thread.elt_dump) {
175 cfs_spin_unlock_bh(&waiting_locks_spinlock);
177 /* from waiting_locks_callback, but not in timer */
178 libcfs_debug_dumplog();
179 libcfs_run_lbug_upcall(__FILE__,
180 "waiting_locks_callback",
181 expired_lock_thread.elt_dump);
183 cfs_spin_lock_bh(&waiting_locks_spinlock);
184 expired_lock_thread.elt_dump = 0;
189 while (!cfs_list_empty(expired)) {
190 struct obd_export *export;
191 struct ldlm_lock *lock;
193 lock = cfs_list_entry(expired->next, struct ldlm_lock,
195 if ((void *)lock < LP_POISON + CFS_PAGE_SIZE &&
196 (void *)lock >= LP_POISON) {
197 cfs_spin_unlock_bh(&waiting_locks_spinlock);
198 CERROR("free lock on elt list %p\n", lock);
201 cfs_list_del_init(&lock->l_pending_chain);
202 if ((void *)lock->l_export < LP_POISON + CFS_PAGE_SIZE &&
203 (void *)lock->l_export >= LP_POISON) {
204 CERROR("lock with free export on elt list %p\n",
206 lock->l_export = NULL;
207 LDLM_ERROR(lock, "free export");
208 /* release extra ref grabbed by
209 * ldlm_add_waiting_lock() or
210 * ldlm_failed_ast() */
211 LDLM_LOCK_RELEASE(lock);
214 export = class_export_lock_get(lock->l_export, lock);
215 cfs_spin_unlock_bh(&waiting_locks_spinlock);
218 class_fail_export(export);
219 class_export_lock_put(export, lock);
221 /* release extra ref grabbed by ldlm_add_waiting_lock()
222 * or ldlm_failed_ast() */
223 LDLM_LOCK_RELEASE(lock);
225 cfs_spin_lock_bh(&waiting_locks_spinlock);
227 cfs_spin_unlock_bh(&waiting_locks_spinlock);
229 if (do_dump && obd_dump_on_eviction) {
230 CERROR("dump the log upon eviction\n");
231 libcfs_debug_dumplog();
234 if (expired_lock_thread.elt_state == ELT_TERMINATE)
238 expired_lock_thread.elt_state = ELT_STOPPED;
239 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
243 static int ldlm_add_waiting_lock(struct ldlm_lock *lock);
246 * Check if there is a request in the export request list
247 * which prevents the lock canceling.
249 static int ldlm_lock_busy(struct ldlm_lock *lock)
251 struct ptlrpc_request *req;
255 if (lock->l_export == NULL)
258 cfs_spin_lock(&lock->l_export->exp_lock);
259 cfs_list_for_each_entry(req, &lock->l_export->exp_queued_rpc,
261 if (req->rq_ops->hpreq_lock_match) {
262 match = req->rq_ops->hpreq_lock_match(req, lock);
267 cfs_spin_unlock(&lock->l_export->exp_lock);
271 /* This is called from within a timer interrupt and cannot schedule */
272 static void waiting_locks_callback(unsigned long unused)
274 struct ldlm_lock *lock, *last = NULL;
277 cfs_spin_lock_bh(&waiting_locks_spinlock);
278 while (!cfs_list_empty(&waiting_locks_list)) {
279 lock = cfs_list_entry(waiting_locks_list.next, struct ldlm_lock,
281 if (cfs_time_after(lock->l_callback_timeout,
282 cfs_time_current()) ||
283 (lock->l_req_mode == LCK_GROUP))
286 if (ptlrpc_check_suspend()) {
287 /* there is a case when we talk to one mds, holding
288 * lock from another mds. this way we easily can get
289 * here, if second mds is being recovered. so, we
290 * suspend timeouts. bug 6019 */
292 LDLM_ERROR(lock, "recharge timeout: %s@%s nid %s ",
293 lock->l_export->exp_client_uuid.uuid,
294 lock->l_export->exp_connection->c_remote_uuid.uuid,
295 libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
297 cfs_list_del_init(&lock->l_pending_chain);
298 cfs_spin_unlock_bh(&waiting_locks_spinlock);
299 ldlm_add_waiting_lock(lock);
303 /* if timeout overlaps the activation time of suspended timeouts
304 * then extend it to give a chance for client to reconnect */
305 if (cfs_time_before(cfs_time_sub(lock->l_callback_timeout,
306 cfs_time_seconds(obd_timeout)/2),
307 ptlrpc_suspend_wakeup_time())) {
308 LDLM_ERROR(lock, "extend timeout due to recovery: %s@%s nid %s ",
309 lock->l_export->exp_client_uuid.uuid,
310 lock->l_export->exp_connection->c_remote_uuid.uuid,
311 libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
313 cfs_list_del_init(&lock->l_pending_chain);
314 cfs_spin_unlock_bh(&waiting_locks_spinlock);
315 ldlm_add_waiting_lock(lock);
319 /* Check if we need to prolong timeout */
320 if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT) &&
321 ldlm_lock_busy(lock)) {
324 if (lock->l_pending_chain.next == &waiting_locks_list)
329 cfs_spin_unlock_bh(&waiting_locks_spinlock);
330 LDLM_DEBUG(lock, "prolong the busy lock");
331 ldlm_refresh_waiting_lock(lock,
332 ldlm_get_enq_timeout(lock));
333 cfs_spin_lock_bh(&waiting_locks_spinlock);
336 LDLM_LOCK_RELEASE(lock);
340 LDLM_LOCK_RELEASE(lock);
343 lock->l_resource->lr_namespace->ns_timeouts++;
344 LDLM_ERROR(lock, "lock callback timer expired after %lds: "
345 "evicting client at %s ",
346 cfs_time_current_sec()- lock->l_last_activity,
348 lock->l_export->exp_connection->c_peer.nid));
352 /* no needs to take an extra ref on the lock since it was in
353 * the waiting_locks_list and ldlm_add_waiting_lock()
354 * already grabbed a ref */
355 cfs_list_del(&lock->l_pending_chain);
356 cfs_list_add(&lock->l_pending_chain,
357 &expired_lock_thread.elt_expired_locks);
360 if (!cfs_list_empty(&expired_lock_thread.elt_expired_locks)) {
361 if (obd_dump_on_timeout)
362 expired_lock_thread.elt_dump = __LINE__;
364 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
368 * Make sure the timer will fire again if we have any locks
371 if (!cfs_list_empty(&waiting_locks_list)) {
372 cfs_time_t timeout_rounded;
373 lock = cfs_list_entry(waiting_locks_list.next, struct ldlm_lock,
375 timeout_rounded = (cfs_time_t)round_timeout(lock->l_callback_timeout);
376 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
378 cfs_spin_unlock_bh(&waiting_locks_spinlock);
382 * Indicate that we're waiting for a client to call us back cancelling a given
383 * lock. We add it to the pending-callback chain, and schedule the lock-timeout
384 * timer to fire appropriately. (We round up to the next second, to avoid
385 * floods of timer firings during periods of high lock contention and traffic).
386 * As done by ldlm_add_waiting_lock(), the caller must grab a lock reference
387 * if it has been added to the waiting list (1 is returned).
389 * Called with the namespace lock held.
391 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, int seconds)
394 cfs_time_t timeout_rounded;
396 if (!cfs_list_empty(&lock->l_pending_chain))
399 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT) ||
400 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
403 timeout = cfs_time_shift(seconds);
404 if (likely(cfs_time_after(timeout, lock->l_callback_timeout)))
405 lock->l_callback_timeout = timeout;
407 timeout_rounded = round_timeout(lock->l_callback_timeout);
409 if (cfs_time_before(timeout_rounded,
410 cfs_timer_deadline(&waiting_locks_timer)) ||
411 !cfs_timer_is_armed(&waiting_locks_timer)) {
412 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
414 /* if the new lock has a shorter timeout than something earlier on
415 the list, we'll wait the longer amount of time; no big deal. */
417 cfs_list_add_tail(&lock->l_pending_chain, &waiting_locks_list);
421 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
424 int timeout = ldlm_get_enq_timeout(lock);
426 LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK));
428 cfs_spin_lock_bh(&waiting_locks_spinlock);
429 if (lock->l_destroyed) {
430 static cfs_time_t next;
431 cfs_spin_unlock_bh(&waiting_locks_spinlock);
432 LDLM_ERROR(lock, "not waiting on destroyed lock (bug 5653)");
433 if (cfs_time_after(cfs_time_current(), next)) {
434 next = cfs_time_shift(14400);
435 libcfs_debug_dumpstack(NULL);
440 ret = __ldlm_add_waiting_lock(lock, timeout);
442 /* grab ref on the lock if it has been added to the
445 cfs_spin_unlock_bh(&waiting_locks_spinlock);
447 LDLM_DEBUG(lock, "%sadding to wait list(timeout: %d, AT: %s)",
448 ret == 0 ? "not re-" : "", timeout,
449 AT_OFF ? "off" : "on");
454 * Remove a lock from the pending list, likely because it had its cancellation
455 * callback arrive without incident. This adjusts the lock-timeout timer if
456 * needed. Returns 0 if the lock wasn't pending after all, 1 if it was.
457 * As done by ldlm_del_waiting_lock(), the caller must release the lock
458 * reference when the lock is removed from any list (1 is returned).
460 * Called with namespace lock held.
462 static int __ldlm_del_waiting_lock(struct ldlm_lock *lock)
464 cfs_list_t *list_next;
466 if (cfs_list_empty(&lock->l_pending_chain))
469 list_next = lock->l_pending_chain.next;
470 if (lock->l_pending_chain.prev == &waiting_locks_list) {
471 /* Removing the head of the list, adjust timer. */
472 if (list_next == &waiting_locks_list) {
473 /* No more, just cancel. */
474 cfs_timer_disarm(&waiting_locks_timer);
476 struct ldlm_lock *next;
477 next = cfs_list_entry(list_next, struct ldlm_lock,
479 cfs_timer_arm(&waiting_locks_timer,
480 round_timeout(next->l_callback_timeout));
483 cfs_list_del_init(&lock->l_pending_chain);
488 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
492 if (lock->l_export == NULL) {
493 /* We don't have a "waiting locks list" on clients. */
494 CDEBUG(D_DLMTRACE, "Client lock %p : no-op\n", lock);
498 cfs_spin_lock_bh(&waiting_locks_spinlock);
499 ret = __ldlm_del_waiting_lock(lock);
500 cfs_spin_unlock_bh(&waiting_locks_spinlock);
502 /* release lock ref if it has indeed been removed
504 LDLM_LOCK_RELEASE(lock);
506 LDLM_DEBUG(lock, "%s", ret == 0 ? "wasn't waiting" : "removed");
513 * Called with namespace lock held.
515 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout)
517 if (lock->l_export == NULL) {
518 /* We don't have a "waiting locks list" on clients. */
519 LDLM_DEBUG(lock, "client lock: no-op");
523 cfs_spin_lock_bh(&waiting_locks_spinlock);
525 if (cfs_list_empty(&lock->l_pending_chain)) {
526 cfs_spin_unlock_bh(&waiting_locks_spinlock);
527 LDLM_DEBUG(lock, "wasn't waiting");
531 /* we remove/add the lock to the waiting list, so no needs to
532 * release/take a lock reference */
533 __ldlm_del_waiting_lock(lock);
534 __ldlm_add_waiting_lock(lock, timeout);
535 cfs_spin_unlock_bh(&waiting_locks_spinlock);
537 LDLM_DEBUG(lock, "refreshed");
540 #else /* !__KERNEL__ */
542 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
544 LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK));
548 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
553 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout)
557 #endif /* __KERNEL__ */
559 static void ldlm_failed_ast(struct ldlm_lock *lock, int rc,
560 const char *ast_type)
562 LCONSOLE_ERROR_MSG(0x138, "%s: A client on nid %s was evicted due "
563 "to a lock %s callback time out: rc %d\n",
564 lock->l_export->exp_obd->obd_name,
565 obd_export_nid2str(lock->l_export), ast_type, rc);
567 if (obd_dump_on_timeout)
568 libcfs_debug_dumplog();
570 cfs_spin_lock_bh(&waiting_locks_spinlock);
571 if (__ldlm_del_waiting_lock(lock) == 0)
572 /* the lock was not in any list, grab an extra ref before adding
573 * the lock to the expired list */
575 cfs_list_add(&lock->l_pending_chain,
576 &expired_lock_thread.elt_expired_locks);
577 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
578 cfs_spin_unlock_bh(&waiting_locks_spinlock);
580 class_fail_export(lock->l_export);
584 static int ldlm_handle_ast_error(struct ldlm_lock *lock,
585 struct ptlrpc_request *req, int rc,
586 const char *ast_type)
588 lnet_process_id_t peer = req->rq_import->imp_connection->c_peer;
590 if (rc == -ETIMEDOUT || rc == -EINTR || rc == -ENOTCONN) {
591 LASSERT(lock->l_export);
592 if (lock->l_export->exp_libclient) {
593 LDLM_DEBUG(lock, "%s AST to liblustre client (nid %s)"
594 " timeout, just cancelling lock", ast_type,
595 libcfs_nid2str(peer.nid));
596 ldlm_lock_cancel(lock);
598 } else if (lock->l_flags & LDLM_FL_CANCEL) {
599 LDLM_DEBUG(lock, "%s AST timeout from nid %s, but "
600 "cancel was received (AST reply lost?)",
601 ast_type, libcfs_nid2str(peer.nid));
602 ldlm_lock_cancel(lock);
605 ldlm_del_waiting_lock(lock);
606 ldlm_failed_ast(lock, rc, ast_type);
610 LDLM_DEBUG(lock, "client (nid %s) returned %d"
611 " from %s AST - normal race",
612 libcfs_nid2str(peer.nid),
614 lustre_msg_get_status(req->rq_repmsg) : -1,
617 LDLM_ERROR(lock, "client (nid %s) returned %d "
618 "from %s AST", libcfs_nid2str(peer.nid),
619 (req->rq_repmsg != NULL) ?
620 lustre_msg_get_status(req->rq_repmsg) : 0,
622 ldlm_lock_cancel(lock);
623 /* Server-side AST functions are called from ldlm_reprocess_all,
624 * which needs to be told to please restart its reprocessing. */
631 static int ldlm_cb_interpret(const struct lu_env *env,
632 struct ptlrpc_request *req, void *data, int rc)
634 struct ldlm_cb_set_arg *arg;
635 struct ldlm_lock *lock;
638 LASSERT(data != NULL);
640 arg = req->rq_async_args.pointer_arg[0];
641 lock = req->rq_async_args.pointer_arg[1];
642 LASSERT(lock != NULL);
644 /* If client canceled the lock but the cancel has not
645 * been received yet, we need to update lvbo to have the
646 * proper attributes cached. */
647 if (rc == -EINVAL && arg->type == LDLM_BL_CALLBACK)
648 ldlm_res_lvbo_update(lock->l_resource, NULL, 1);
649 rc = ldlm_handle_ast_error(lock, req, rc,
650 arg->type == LDLM_BL_CALLBACK
651 ? "blocking" : "completion");
654 LDLM_LOCK_RELEASE(lock);
657 cfs_atomic_set(&arg->restart, 1);
662 static inline int ldlm_bl_and_cp_ast_fini(struct ptlrpc_request *req,
663 struct ldlm_cb_set_arg *arg,
664 struct ldlm_lock *lock,
670 if (unlikely(instant_cancel)) {
671 rc = ptl_send_rpc(req, 1);
672 ptlrpc_req_finished(req);
674 /* If we cancelled the lock, we need to restart
675 * ldlm_reprocess_queue */
676 cfs_atomic_set(&arg->restart, 1);
679 ptlrpc_set_add_req(arg->set, req);
686 * Check if there are requests in the export request list which prevent
687 * the lock canceling and make these requests high priority ones.
689 static void ldlm_lock_reorder_req(struct ldlm_lock *lock)
691 struct ptlrpc_request *req;
694 if (lock->l_export == NULL) {
695 LDLM_DEBUG(lock, "client lock: no-op");
699 cfs_spin_lock(&lock->l_export->exp_lock);
700 cfs_list_for_each_entry(req, &lock->l_export->exp_queued_rpc,
702 if (!req->rq_hp && req->rq_ops->hpreq_lock_match &&
703 req->rq_ops->hpreq_lock_match(req, lock))
704 ptlrpc_hpreq_reorder(req);
706 cfs_spin_unlock(&lock->l_export->exp_lock);
711 * ->l_blocking_ast() method for server-side locks. This is invoked when newly
712 * enqueued server lock conflicts with given one.
714 * Sends blocking ast rpc to the client owning that lock; arms timeout timer
715 * to wait for client response.
717 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
718 struct ldlm_lock_desc *desc,
719 void *data, int flag)
721 struct ldlm_cb_set_arg *arg = data;
722 struct ldlm_request *body;
723 struct ptlrpc_request *req;
724 int instant_cancel = 0;
728 if (flag == LDLM_CB_CANCELING)
729 /* Don't need to do anything here. */
733 LASSERT(data != NULL);
734 if (lock->l_export->exp_obd->obd_recovering != 0) {
735 LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
736 ldlm_lock_dump(D_ERROR, lock, 0);
739 ldlm_lock_reorder_req(lock);
741 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
742 &RQF_LDLM_BL_CALLBACK,
743 LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK);
747 req->rq_async_args.pointer_arg[0] = arg;
748 req->rq_async_args.pointer_arg[1] = lock;
749 req->rq_interpret_reply = ldlm_cb_interpret;
750 req->rq_no_resend = 1;
752 lock_res(lock->l_resource);
753 if (lock->l_granted_mode != lock->l_req_mode) {
754 /* this blocking AST will be communicated as part of the
755 * completion AST instead */
756 unlock_res(lock->l_resource);
757 ptlrpc_req_finished(req);
758 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
762 if (lock->l_destroyed) {
763 /* What's the point? */
764 unlock_res(lock->l_resource);
765 ptlrpc_req_finished(req);
769 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
772 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
773 body->lock_handle[0] = lock->l_remote_handle;
774 body->lock_desc = *desc;
775 body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
777 LDLM_DEBUG(lock, "server preparing blocking AST");
779 ptlrpc_request_set_replen(req);
780 if (instant_cancel) {
781 unlock_res(lock->l_resource);
782 ldlm_lock_cancel(lock);
784 LASSERT(lock->l_granted_mode == lock->l_req_mode);
785 ldlm_add_waiting_lock(lock);
786 unlock_res(lock->l_resource);
789 req->rq_send_state = LUSTRE_IMP_FULL;
790 /* ptlrpc_request_alloc_pack already set timeout */
792 req->rq_timeout = ldlm_get_rq_timeout();
794 if (lock->l_export && lock->l_export->exp_nid_stats &&
795 lock->l_export->exp_nid_stats->nid_ldlm_stats)
796 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
797 LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
799 rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
804 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data)
806 struct ldlm_cb_set_arg *arg = data;
807 struct ldlm_request *body;
808 struct ptlrpc_request *req;
809 long total_enqueue_wait;
810 int instant_cancel = 0;
814 LASSERT(lock != NULL);
815 LASSERT(data != NULL);
817 total_enqueue_wait = cfs_time_sub(cfs_time_current_sec(),
818 lock->l_last_activity);
820 req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse,
821 &RQF_LDLM_CP_CALLBACK);
825 lock_res_and_lock(lock);
826 if (lock->l_resource->lr_lvb_len)
827 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT,
828 lock->l_resource->lr_lvb_len);
829 unlock_res_and_lock(lock);
831 rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK);
833 ptlrpc_request_free(req);
837 req->rq_async_args.pointer_arg[0] = arg;
838 req->rq_async_args.pointer_arg[1] = lock;
839 req->rq_interpret_reply = ldlm_cb_interpret;
840 req->rq_no_resend = 1;
841 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
843 body->lock_handle[0] = lock->l_remote_handle;
844 body->lock_flags = flags;
845 ldlm_lock2desc(lock, &body->lock_desc);
846 if (lock->l_resource->lr_lvb_len) {
847 void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB);
849 lock_res_and_lock(lock);
850 memcpy(lvb, lock->l_resource->lr_lvb_data,
851 lock->l_resource->lr_lvb_len);
852 unlock_res_and_lock(lock);
855 LDLM_DEBUG(lock, "server preparing completion AST (after %lds wait)",
858 /* Server-side enqueue wait time estimate, used in
859 __ldlm_add_waiting_lock to set future enqueue timers */
860 if (total_enqueue_wait < ldlm_get_enq_timeout(lock))
861 at_measured(&lock->l_resource->lr_namespace->ns_at_estimate,
864 /* bz18618. Don't add lock enqueue time we spend waiting for a
865 previous callback to fail. Locks waiting legitimately will
866 get extended by ldlm_refresh_waiting_lock regardless of the
867 estimate, so it's okay to underestimate here. */
868 LDLM_DEBUG(lock, "lock completed after %lus; estimate was %ds. "
869 "It is likely that a previous callback timed out.",
871 at_get(&lock->l_resource->lr_namespace->ns_at_estimate));
873 ptlrpc_request_set_replen(req);
875 req->rq_send_state = LUSTRE_IMP_FULL;
876 /* ptlrpc_request_pack already set timeout */
878 req->rq_timeout = ldlm_get_rq_timeout();
880 /* We only send real blocking ASTs after the lock is granted */
881 lock_res_and_lock(lock);
882 if (lock->l_flags & LDLM_FL_AST_SENT) {
883 body->lock_flags |= LDLM_FL_AST_SENT;
884 /* copy ast flags like LDLM_FL_DISCARD_DATA */
885 body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
887 /* We might get here prior to ldlm_handle_enqueue setting
888 * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
889 * into waiting list, but this is safe and similar code in
890 * ldlm_handle_enqueue will call ldlm_lock_cancel() still,
891 * that would not only cancel the lock, but will also remove
892 * it from waiting list */
893 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
894 unlock_res_and_lock(lock);
895 ldlm_lock_cancel(lock);
897 lock_res_and_lock(lock);
899 /* start the lock-timeout clock */
900 ldlm_add_waiting_lock(lock);
903 unlock_res_and_lock(lock);
905 if (lock->l_export && lock->l_export->exp_nid_stats &&
906 lock->l_export->exp_nid_stats->nid_ldlm_stats)
907 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
908 LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
910 rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
915 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
917 struct ldlm_resource *res = lock->l_resource;
918 struct ldlm_request *body;
919 struct ptlrpc_request *req;
923 LASSERT(lock != NULL);
925 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
926 &RQF_LDLM_GL_CALLBACK,
927 LUSTRE_DLM_VERSION, LDLM_GL_CALLBACK);
932 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
933 body->lock_handle[0] = lock->l_remote_handle;
934 ldlm_lock2desc(lock, &body->lock_desc);
936 lock_res_and_lock(lock);
937 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
938 lock->l_resource->lr_lvb_len);
939 unlock_res_and_lock(lock);
940 res = lock->l_resource;
941 ptlrpc_request_set_replen(req);
944 req->rq_send_state = LUSTRE_IMP_FULL;
945 /* ptlrpc_request_alloc_pack already set timeout */
947 req->rq_timeout = ldlm_get_rq_timeout();
949 if (lock->l_export && lock->l_export->exp_nid_stats &&
950 lock->l_export->exp_nid_stats->nid_ldlm_stats)
951 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
952 LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
954 rc = ptlrpc_queue_wait(req);
955 if (rc == -ELDLM_NO_LOCK_DATA)
956 LDLM_DEBUG(lock, "lost race - client has a lock but no inode");
958 rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
960 rc = ldlm_res_lvbo_update(res, req, 1);
962 ptlrpc_req_finished(req);
964 ldlm_reprocess_all(res);
970 extern unsigned long long lu_time_stamp_get(void);
972 #define lu_time_stamp_get() time(NULL)
975 static void ldlm_svc_get_eopc(const struct ldlm_request *dlm_req,
976 struct lprocfs_stats *srv_stats)
978 int lock_type = 0, op = 0;
980 lock_type = dlm_req->lock_desc.l_resource.lr_type;
984 op = PTLRPC_LAST_CNTR + LDLM_PLAIN_ENQUEUE;
987 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT)
988 op = PTLRPC_LAST_CNTR + LDLM_GLIMPSE_ENQUEUE;
990 op = PTLRPC_LAST_CNTR + LDLM_EXTENT_ENQUEUE;
993 op = PTLRPC_LAST_CNTR + LDLM_FLOCK_ENQUEUE;
996 op = PTLRPC_LAST_CNTR + LDLM_IBITS_ENQUEUE;
1004 lprocfs_counter_incr(srv_stats, op);
1010 * Main server-side entry point into LDLM. This is called by ptlrpc service
1011 * threads to carry out client lock enqueueing requests.
1013 int ldlm_handle_enqueue0(struct ldlm_namespace *ns,
1014 struct ptlrpc_request *req,
1015 const struct ldlm_request *dlm_req,
1016 const struct ldlm_callback_suite *cbs)
1018 struct ldlm_reply *dlm_rep;
1020 ldlm_error_t err = ELDLM_OK;
1021 struct ldlm_lock *lock = NULL;
1022 void *cookie = NULL;
1026 LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
1028 ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF);
1029 flags = dlm_req->lock_flags;
1031 LASSERT(req->rq_export);
1033 if (req->rq_rqbd->rqbd_service->srv_stats)
1034 ldlm_svc_get_eopc(dlm_req,
1035 req->rq_rqbd->rqbd_service->srv_stats);
1037 if (req->rq_export && req->rq_export->exp_nid_stats &&
1038 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1039 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1040 LDLM_ENQUEUE - LDLM_FIRST_OPC);
1042 if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE ||
1043 dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) {
1044 DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
1045 dlm_req->lock_desc.l_resource.lr_type);
1046 GOTO(out, rc = -EFAULT);
1049 if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE ||
1050 dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE ||
1051 dlm_req->lock_desc.l_req_mode &
1052 (dlm_req->lock_desc.l_req_mode-1))) {
1053 DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
1054 dlm_req->lock_desc.l_req_mode);
1055 GOTO(out, rc = -EFAULT);
1058 if (req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) {
1059 if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1061 DEBUG_REQ(D_ERROR, req,
1062 "PLAIN lock request from IBITS client?");
1063 GOTO(out, rc = -EPROTO);
1065 } else if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1067 DEBUG_REQ(D_ERROR, req,
1068 "IBITS lock request from unaware client?");
1069 GOTO(out, rc = -EPROTO);
1073 /* FIXME this makes it impossible to use LDLM_PLAIN locks -- check
1074 against server's _CONNECT_SUPPORTED flags? (I don't want to use
1075 ibits for mgc/mgs) */
1077 /* INODEBITS_INTEROP: Perform conversion from plain lock to
1078 * inodebits lock if client does not support them. */
1079 if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) &&
1080 (dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN)) {
1081 dlm_req->lock_desc.l_resource.lr_type = LDLM_IBITS;
1082 dlm_req->lock_desc.l_policy_data.l_inodebits.bits =
1083 MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE;
1084 if (dlm_req->lock_desc.l_req_mode == LCK_PR)
1085 dlm_req->lock_desc.l_req_mode = LCK_CR;
1089 if (unlikely(flags & LDLM_FL_REPLAY)) {
1090 /* Find an existing lock in the per-export lock hash */
1091 lock = cfs_hash_lookup(req->rq_export->exp_lock_hash,
1092 (void *)&dlm_req->lock_handle[0]);
1094 DEBUG_REQ(D_DLMTRACE, req, "found existing lock cookie "
1095 LPX64, lock->l_handle.h_cookie);
1096 GOTO(existing_lock, rc = 0);
1100 /* The lock's callback data might be set in the policy function */
1101 lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
1102 dlm_req->lock_desc.l_resource.lr_type,
1103 dlm_req->lock_desc.l_req_mode,
1107 GOTO(out, rc = -ENOMEM);
1109 lock->l_last_activity = cfs_time_current_sec();
1110 lock->l_remote_handle = dlm_req->lock_handle[0];
1111 LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
1113 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
1114 /* Don't enqueue a lock onto the export if it has already
1115 * been evicted. Cancel it now instead. (bug 3822) */
1116 if (req->rq_export->exp_failed) {
1117 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1118 GOTO(out, rc = -ENOTCONN);
1121 lock->l_export = class_export_lock_get(req->rq_export, lock);
1122 if (lock->l_export->exp_lock_hash)
1123 cfs_hash_add(lock->l_export->exp_lock_hash,
1124 &lock->l_remote_handle,
1129 if (flags & LDLM_FL_HAS_INTENT) {
1130 /* In this case, the reply buffer is allocated deep in
1131 * local_lock_enqueue by the policy function. */
1134 lock_res_and_lock(lock);
1135 if (lock->l_resource->lr_lvb_len) {
1136 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
1138 lock->l_resource->lr_lvb_len);
1140 unlock_res_and_lock(lock);
1142 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
1143 GOTO(out, rc = -ENOMEM);
1145 rc = req_capsule_server_pack(&req->rq_pill);
1150 if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN)
1151 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1152 if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
1153 lock->l_req_extent = lock->l_policy_data.l_extent;
1155 err = ldlm_lock_enqueue(ns, &lock, cookie, (int *)&flags);
1159 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1160 dlm_rep->lock_flags = flags;
1162 ldlm_lock2desc(lock, &dlm_rep->lock_desc);
1163 ldlm_lock2handle(lock, &dlm_rep->lock_handle);
1165 /* We never send a blocking AST until the lock is granted, but
1166 * we can tell it right now */
1167 lock_res_and_lock(lock);
1169 /* Now take into account flags to be inherited from original lock
1170 request both in reply to client and in our own lock flags. */
1171 dlm_rep->lock_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1172 lock->l_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1174 /* Don't move a pending lock onto the export if it has already
1175 * been evicted. Cancel it now instead. (bug 5683) */
1176 if (unlikely(req->rq_export->exp_failed ||
1177 OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
1178 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1180 } else if (lock->l_flags & LDLM_FL_AST_SENT) {
1181 dlm_rep->lock_flags |= LDLM_FL_AST_SENT;
1182 if (lock->l_granted_mode == lock->l_req_mode) {
1184 * Only cancel lock if it was granted, because it would
1185 * be destroyed immediately and would never be granted
1186 * in the future, causing timeouts on client. Not
1187 * granted lock will be cancelled immediately after
1188 * sending completion AST.
1190 if (dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1191 unlock_res_and_lock(lock);
1192 ldlm_lock_cancel(lock);
1193 lock_res_and_lock(lock);
1195 ldlm_add_waiting_lock(lock);
1198 /* Make sure we never ever grant usual metadata locks to liblustre
1200 if ((dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN ||
1201 dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) &&
1202 req->rq_export->exp_libclient) {
1203 if (unlikely(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) ||
1204 !(dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK))){
1205 CERROR("Granting sync lock to libclient. "
1206 "req fl %d, rep fl %d, lock fl "LPX64"\n",
1207 dlm_req->lock_flags, dlm_rep->lock_flags,
1209 LDLM_ERROR(lock, "sync lock");
1210 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT) {
1211 struct ldlm_intent *it;
1213 it = req_capsule_client_get(&req->rq_pill,
1216 CERROR("This is intent %s ("LPU64")\n",
1217 ldlm_it2str(it->opc), it->opc);
1223 unlock_res_and_lock(lock);
1227 req->rq_status = rc ?: err; /* return either error - bug 11190 */
1228 if (!req->rq_packed_final) {
1229 err = lustre_pack_reply(req, 1, NULL, NULL);
1234 /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
1235 * ldlm_reprocess_all. If this moves, revisit that code. -phil */
1237 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
1238 "(err=%d, rc=%d)", err, rc);
1240 lock_res_and_lock(lock);
1242 if (lock->l_resource->lr_lvb_len > 0) {
1245 lvb = req_capsule_server_get(&req->rq_pill,
1247 LASSERTF(lvb != NULL, "req %p, lock %p\n",
1250 memcpy(lvb, lock->l_resource->lr_lvb_data,
1251 lock->l_resource->lr_lvb_len);
1254 ldlm_resource_unlink_lock(lock);
1255 ldlm_lock_destroy_nolock(lock);
1257 unlock_res_and_lock(lock);
1259 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
1260 ldlm_reprocess_all(lock->l_resource);
1262 LDLM_LOCK_RELEASE(lock);
1265 LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
1271 int ldlm_handle_enqueue(struct ptlrpc_request *req,
1272 ldlm_completion_callback completion_callback,
1273 ldlm_blocking_callback blocking_callback,
1274 ldlm_glimpse_callback glimpse_callback)
1276 struct ldlm_request *dlm_req;
1277 struct ldlm_callback_suite cbs = {
1278 .lcs_completion = completion_callback,
1279 .lcs_blocking = blocking_callback,
1280 .lcs_glimpse = glimpse_callback
1284 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1285 if (dlm_req != NULL) {
1286 rc = ldlm_handle_enqueue0(req->rq_export->exp_obd->obd_namespace,
1287 req, dlm_req, &cbs);
1294 int ldlm_handle_convert0(struct ptlrpc_request *req,
1295 const struct ldlm_request *dlm_req)
1297 struct ldlm_reply *dlm_rep;
1298 struct ldlm_lock *lock;
1302 if (req->rq_export && req->rq_export->exp_nid_stats &&
1303 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1304 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1305 LDLM_CONVERT - LDLM_FIRST_OPC);
1307 rc = req_capsule_server_pack(&req->rq_pill);
1311 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1312 dlm_rep->lock_flags = dlm_req->lock_flags;
1314 lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
1316 req->rq_status = EINVAL;
1320 LDLM_DEBUG(lock, "server-side convert handler START");
1322 lock->l_last_activity = cfs_time_current_sec();
1323 res = ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
1324 &dlm_rep->lock_flags);
1326 if (ldlm_del_waiting_lock(lock))
1327 LDLM_DEBUG(lock, "converted waiting lock");
1330 req->rq_status = EDEADLOCK;
1335 if (!req->rq_status)
1336 ldlm_reprocess_all(lock->l_resource);
1337 LDLM_DEBUG(lock, "server-side convert handler END");
1338 LDLM_LOCK_PUT(lock);
1340 LDLM_DEBUG_NOLOCK("server-side convert handler END");
1345 int ldlm_handle_convert(struct ptlrpc_request *req)
1348 struct ldlm_request *dlm_req;
1350 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1351 if (dlm_req != NULL) {
1352 rc = ldlm_handle_convert0(req, dlm_req);
1354 CERROR ("Can't unpack dlm_req\n");
1360 /* Cancel all the locks whos handles are packed into ldlm_request */
1361 int ldlm_request_cancel(struct ptlrpc_request *req,
1362 const struct ldlm_request *dlm_req, int first)
1364 struct ldlm_resource *res, *pres = NULL;
1365 struct ldlm_lock *lock;
1366 int i, count, done = 0;
1369 count = dlm_req->lock_count ? dlm_req->lock_count : 1;
1373 /* There is no lock on the server at the replay time,
1374 * skip lock cancelling to make replay tests to pass. */
1375 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1378 LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, "
1379 "starting at %d", count, first);
1381 for (i = first; i < count; i++) {
1382 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
1384 LDLM_DEBUG_NOLOCK("server-side cancel handler stale "
1385 "lock (cookie "LPU64")",
1386 dlm_req->lock_handle[i].cookie);
1390 res = lock->l_resource;
1395 ldlm_reprocess_all(pres);
1396 LDLM_RESOURCE_DELREF(pres);
1397 ldlm_resource_putref(pres);
1400 ldlm_resource_getref(res);
1401 LDLM_RESOURCE_ADDREF(res);
1402 ldlm_res_lvbo_update(res, NULL, 1);
1406 ldlm_lock_cancel(lock);
1407 LDLM_LOCK_PUT(lock);
1410 ldlm_reprocess_all(pres);
1411 LDLM_RESOURCE_DELREF(pres);
1412 ldlm_resource_putref(pres);
1414 LDLM_DEBUG_NOLOCK("server-side cancel handler END");
1418 int ldlm_handle_cancel(struct ptlrpc_request *req)
1420 struct ldlm_request *dlm_req;
1424 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1425 if (dlm_req == NULL) {
1426 CDEBUG(D_INFO, "bad request buffer for cancel\n");
1430 if (req->rq_export && req->rq_export->exp_nid_stats &&
1431 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1432 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1433 LDLM_CANCEL - LDLM_FIRST_OPC);
1435 rc = req_capsule_server_pack(&req->rq_pill);
1439 if (!ldlm_request_cancel(req, dlm_req, 0))
1440 req->rq_status = ESTALE;
1442 if (ptlrpc_reply(req) != 0)
1448 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
1449 struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1454 LDLM_DEBUG(lock, "client blocking AST callback handler");
1456 lock_res_and_lock(lock);
1457 lock->l_flags |= LDLM_FL_CBPENDING;
1459 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
1460 lock->l_flags |= LDLM_FL_CANCEL;
1462 do_ast = (!lock->l_readers && !lock->l_writers);
1463 unlock_res_and_lock(lock);
1466 CDEBUG(D_DLMTRACE, "Lock %p already unused, calling callback (%p)\n",
1467 lock, lock->l_blocking_ast);
1468 if (lock->l_blocking_ast != NULL)
1469 lock->l_blocking_ast(lock, ld, lock->l_ast_data,
1472 CDEBUG(D_DLMTRACE, "Lock %p is referenced, will be cancelled later\n",
1476 LDLM_DEBUG(lock, "client blocking callback handler END");
1477 LDLM_LOCK_RELEASE(lock);
1481 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
1482 struct ldlm_namespace *ns,
1483 struct ldlm_request *dlm_req,
1484 struct ldlm_lock *lock)
1486 CFS_LIST_HEAD(ast_list);
1489 LDLM_DEBUG(lock, "client completion callback handler START");
1491 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) {
1492 int to = cfs_time_seconds(1);
1494 cfs_schedule_timeout_and_set_state(
1495 CFS_TASK_INTERRUPTIBLE, to);
1496 if (lock->l_granted_mode == lock->l_req_mode ||
1502 lock_res_and_lock(lock);
1503 if (lock->l_destroyed ||
1504 lock->l_granted_mode == lock->l_req_mode) {
1505 /* bug 11300: the lock has already been granted */
1506 unlock_res_and_lock(lock);
1507 LDLM_DEBUG(lock, "Double grant race happened");
1508 LDLM_LOCK_RELEASE(lock);
1513 /* If we receive the completion AST before the actual enqueue returned,
1514 * then we might need to switch lock modes, resources, or extents. */
1515 if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
1516 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
1517 LDLM_DEBUG(lock, "completion AST, new lock mode");
1520 if (lock->l_resource->lr_type != LDLM_PLAIN) {
1521 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1522 LDLM_DEBUG(lock, "completion AST, new policy data");
1525 ldlm_resource_unlink_lock(lock);
1526 if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
1527 &lock->l_resource->lr_name,
1528 sizeof(lock->l_resource->lr_name)) != 0) {
1529 unlock_res_and_lock(lock);
1530 if (ldlm_lock_change_resource(ns, lock,
1531 &dlm_req->lock_desc.l_resource.lr_name) != 0) {
1532 LDLM_ERROR(lock, "Failed to allocate resource");
1533 LDLM_LOCK_RELEASE(lock);
1537 LDLM_DEBUG(lock, "completion AST, new resource");
1538 CERROR("change resource!\n");
1539 lock_res_and_lock(lock);
1542 if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
1543 /* BL_AST locks are not needed in lru.
1544 * let ldlm_cancel_lru() be fast. */
1545 ldlm_lock_remove_from_lru(lock);
1546 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
1547 LDLM_DEBUG(lock, "completion AST includes blocking AST");
1550 if (lock->l_lvb_len) {
1551 if (req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB,
1552 RCL_CLIENT) < lock->l_lvb_len) {
1553 LDLM_ERROR(lock, "completion AST did not contain "
1556 void *lvb = req_capsule_client_get(&req->rq_pill,
1558 memcpy(lock->l_lvb_data, lvb, lock->l_lvb_len);
1562 ldlm_grant_lock(lock, &ast_list);
1563 unlock_res_and_lock(lock);
1565 LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
1567 ldlm_run_ast_work(&ast_list, LDLM_WORK_CP_AST);
1569 LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
1571 LDLM_LOCK_RELEASE(lock);
1575 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
1576 struct ldlm_namespace *ns,
1577 struct ldlm_request *dlm_req,
1578 struct ldlm_lock *lock)
1583 LDLM_DEBUG(lock, "client glimpse AST callback handler");
1585 if (lock->l_glimpse_ast != NULL)
1586 rc = lock->l_glimpse_ast(lock, req);
1588 if (req->rq_repmsg != NULL) {
1591 req->rq_status = rc;
1595 lock_res_and_lock(lock);
1596 if (lock->l_granted_mode == LCK_PW &&
1597 !lock->l_readers && !lock->l_writers &&
1598 cfs_time_after(cfs_time_current(),
1599 cfs_time_add(lock->l_last_used,
1600 cfs_time_seconds(10)))) {
1601 unlock_res_and_lock(lock);
1602 if (ldlm_bl_to_thread_lock(ns, NULL, lock))
1603 ldlm_handle_bl_callback(ns, NULL, lock);
1608 unlock_res_and_lock(lock);
1609 LDLM_LOCK_RELEASE(lock);
1613 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1615 if (req->rq_no_reply)
1618 req->rq_status = rc;
1619 if (!req->rq_packed_final) {
1620 rc = lustre_pack_reply(req, 1, NULL, NULL);
1624 return ptlrpc_reply(req);
1628 static int __ldlm_bl_to_thread(struct ldlm_bl_work_item *blwi, int mode)
1630 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1633 cfs_spin_lock(&blp->blp_lock);
1634 if (blwi->blwi_lock && blwi->blwi_lock->l_flags & LDLM_FL_DISCARD_DATA) {
1635 /* add LDLM_FL_DISCARD_DATA requests to the priority list */
1636 cfs_list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
1638 /* other blocking callbacks are added to the regular list */
1639 cfs_list_add_tail(&blwi->blwi_entry, &blp->blp_list);
1641 cfs_spin_unlock(&blp->blp_lock);
1643 cfs_waitq_signal(&blp->blp_waitq);
1645 /* can not use blwi->blwi_mode as blwi could be already freed in
1647 if (mode == LDLM_SYNC)
1648 cfs_wait_for_completion(&blwi->blwi_comp);
1653 static inline void init_blwi(struct ldlm_bl_work_item *blwi,
1654 struct ldlm_namespace *ns,
1655 struct ldlm_lock_desc *ld,
1656 cfs_list_t *cancels, int count,
1657 struct ldlm_lock *lock,
1660 cfs_init_completion(&blwi->blwi_comp);
1661 CFS_INIT_LIST_HEAD(&blwi->blwi_head);
1663 if (cfs_memory_pressure_get())
1664 blwi->blwi_mem_pressure = 1;
1667 blwi->blwi_mode = mode;
1669 blwi->blwi_ld = *ld;
1671 cfs_list_add(&blwi->blwi_head, cancels);
1672 cfs_list_del_init(cancels);
1673 blwi->blwi_count = count;
1675 blwi->blwi_lock = lock;
1679 static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
1680 struct ldlm_lock_desc *ld, struct ldlm_lock *lock,
1681 cfs_list_t *cancels, int count, int mode)
1685 if (cancels && count == 0)
1688 if (mode == LDLM_SYNC) {
1689 /* if it is synchronous call do minimum mem alloc, as it could
1690 * be triggered from kernel shrinker
1692 struct ldlm_bl_work_item blwi;
1693 memset(&blwi, 0, sizeof(blwi));
1694 init_blwi(&blwi, ns, ld, cancels, count, lock, LDLM_SYNC);
1695 RETURN(__ldlm_bl_to_thread(&blwi, LDLM_SYNC));
1697 struct ldlm_bl_work_item *blwi;
1698 OBD_ALLOC(blwi, sizeof(*blwi));
1701 init_blwi(blwi, ns, ld, cancels, count, lock, LDLM_ASYNC);
1703 RETURN(__ldlm_bl_to_thread(blwi, LDLM_ASYNC));
1709 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1710 struct ldlm_lock *lock)
1713 RETURN(ldlm_bl_to_thread(ns, ld, lock, NULL, 0, LDLM_ASYNC));
1719 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1720 cfs_list_t *cancels, int count, int mode)
1723 RETURN(ldlm_bl_to_thread(ns, ld, NULL, cancels, count, mode));
1729 /* Setinfo coming from Server (eg MDT) to Client (eg MDC)! */
1730 static int ldlm_handle_setinfo(struct ptlrpc_request *req)
1732 struct obd_device *obd = req->rq_export->exp_obd;
1739 DEBUG_REQ(D_HSM, req, "%s: handle setinfo\n", obd->obd_name);
1741 req_capsule_set(&req->rq_pill, &RQF_OBD_SET_INFO);
1743 key = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
1745 DEBUG_REQ(D_IOCTL, req, "no set_info key");
1748 keylen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_KEY,
1750 val = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
1752 DEBUG_REQ(D_IOCTL, req, "no set_info val");
1755 vallen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_VAL,
1758 /* We are responsible for swabbing contents of val */
1760 if (KEY_IS(KEY_HSM_COPYTOOL_SEND))
1761 /* Pass it on to mdc (the "export" in this case) */
1762 rc = obd_set_info_async(req->rq_export,
1763 sizeof(KEY_HSM_COPYTOOL_SEND),
1764 KEY_HSM_COPYTOOL_SEND,
1767 DEBUG_REQ(D_WARNING, req, "ignoring unknown key %s", key);
1772 static inline void ldlm_callback_errmsg(struct ptlrpc_request *req,
1773 const char *msg, int rc,
1774 struct lustre_handle *handle)
1776 DEBUG_REQ((req->rq_no_reply || rc) ? D_WARNING : D_DLMTRACE, req,
1777 "%s: [nid %s] [rc %d] [lock "LPX64"]",
1778 msg, libcfs_id2str(req->rq_peer), rc,
1779 handle ? handle->cookie : 0);
1780 if (req->rq_no_reply)
1781 CWARN("No reply was sent, maybe cause bug 21636.\n");
1783 CWARN("Send reply failed, maybe cause bug 21636.\n");
1786 /* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */
1787 static int ldlm_callback_handler(struct ptlrpc_request *req)
1789 struct ldlm_namespace *ns;
1790 struct ldlm_request *dlm_req;
1791 struct ldlm_lock *lock;
1795 /* Requests arrive in sender's byte order. The ptlrpc service
1796 * handler has already checked and, if necessary, byte-swapped the
1797 * incoming request message body, but I am responsible for the
1798 * message buffers. */
1800 /* do nothing for sec context finalize */
1801 if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI)
1804 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
1806 if (req->rq_export == NULL) {
1807 rc = ldlm_callback_reply(req, -ENOTCONN);
1808 ldlm_callback_errmsg(req, "Operate on unconnected server",
1813 LASSERT(req->rq_export != NULL);
1814 LASSERT(req->rq_export->exp_obd != NULL);
1816 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1817 case LDLM_BL_CALLBACK:
1818 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK))
1821 case LDLM_CP_CALLBACK:
1822 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK))
1825 case LDLM_GL_CALLBACK:
1826 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK))
1830 rc = ldlm_handle_setinfo(req);
1831 ldlm_callback_reply(req, rc);
1833 case OBD_LOG_CANCEL: /* remove this eventually - for 1.4.0 compat */
1834 CERROR("shouldn't be handling OBD_LOG_CANCEL on DLM thread\n");
1835 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
1836 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
1838 rc = llog_origin_handle_cancel(req);
1839 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_REP))
1841 ldlm_callback_reply(req, rc);
1843 case OBD_QC_CALLBACK:
1844 req_capsule_set(&req->rq_pill, &RQF_QC_CALLBACK);
1845 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_QC_CALLBACK_NET))
1847 rc = target_handle_qc_callback(req);
1848 ldlm_callback_reply(req, rc);
1852 /* reply in handler */
1853 req_capsule_set(&req->rq_pill, &RQF_MDS_QUOTA_DQACQ);
1854 rc = target_handle_dqacq_callback(req);
1856 case LLOG_ORIGIN_HANDLE_CREATE:
1857 req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
1858 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1860 rc = llog_origin_handle_create(req);
1861 ldlm_callback_reply(req, rc);
1863 case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
1864 req_capsule_set(&req->rq_pill,
1865 &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
1866 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1868 rc = llog_origin_handle_next_block(req);
1869 ldlm_callback_reply(req, rc);
1871 case LLOG_ORIGIN_HANDLE_READ_HEADER:
1872 req_capsule_set(&req->rq_pill,
1873 &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER);
1874 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1876 rc = llog_origin_handle_read_header(req);
1877 ldlm_callback_reply(req, rc);
1879 case LLOG_ORIGIN_HANDLE_CLOSE:
1880 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1882 rc = llog_origin_handle_close(req);
1883 ldlm_callback_reply(req, rc);
1886 CERROR("unknown opcode %u\n",
1887 lustre_msg_get_opc(req->rq_reqmsg));
1888 ldlm_callback_reply(req, -EPROTO);
1892 ns = req->rq_export->exp_obd->obd_namespace;
1893 LASSERT(ns != NULL);
1895 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1897 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1898 if (dlm_req == NULL) {
1899 rc = ldlm_callback_reply(req, -EPROTO);
1900 ldlm_callback_errmsg(req, "Operate without parameter", rc,
1905 /* Force a known safe race, send a cancel to the server for a lock
1906 * which the server has already started a blocking callback on. */
1907 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE) &&
1908 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1909 rc = ldlm_cli_cancel(&dlm_req->lock_handle[0]);
1911 CERROR("ldlm_cli_cancel: %d\n", rc);
1914 lock = ldlm_handle2lock_long(&dlm_req->lock_handle[0], 0);
1916 CDEBUG(D_DLMTRACE, "callback on lock "LPX64" - lock "
1917 "disappeared\n", dlm_req->lock_handle[0].cookie);
1918 rc = ldlm_callback_reply(req, -EINVAL);
1919 ldlm_callback_errmsg(req, "Operate with invalid parameter", rc,
1920 &dlm_req->lock_handle[0]);
1924 if ((lock->l_flags & LDLM_FL_FAIL_LOC) &&
1925 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK)
1926 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
1928 /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
1929 lock_res_and_lock(lock);
1930 lock->l_flags |= (dlm_req->lock_flags & LDLM_AST_FLAGS);
1931 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1932 /* If somebody cancels lock and cache is already dropped,
1933 * or lock is failed before cp_ast received on client,
1934 * we can tell the server we have no lock. Otherwise, we
1935 * should send cancel after dropping the cache. */
1936 if (((lock->l_flags & LDLM_FL_CANCELING) &&
1937 (lock->l_flags & LDLM_FL_BL_DONE)) ||
1938 (lock->l_flags & LDLM_FL_FAILED)) {
1939 LDLM_DEBUG(lock, "callback on lock "
1940 LPX64" - lock disappeared\n",
1941 dlm_req->lock_handle[0].cookie);
1942 unlock_res_and_lock(lock);
1943 LDLM_LOCK_RELEASE(lock);
1944 rc = ldlm_callback_reply(req, -EINVAL);
1945 ldlm_callback_errmsg(req, "Operate on stale lock", rc,
1946 &dlm_req->lock_handle[0]);
1949 /* BL_AST locks are not needed in lru.
1950 * let ldlm_cancel_lru() be fast. */
1951 ldlm_lock_remove_from_lru(lock);
1952 lock->l_flags |= LDLM_FL_BL_AST;
1954 unlock_res_and_lock(lock);
1956 /* We want the ost thread to get this reply so that it can respond
1957 * to ost requests (write cache writeback) that might be triggered
1960 * But we'd also like to be able to indicate in the reply that we're
1961 * cancelling right now, because it's unused, or have an intent result
1962 * in the reply, so we might have to push the responsibility for sending
1963 * the reply down into the AST handlers, alas. */
1965 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1966 case LDLM_BL_CALLBACK:
1967 CDEBUG(D_INODE, "blocking ast\n");
1968 req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
1969 if (!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)) {
1970 rc = ldlm_callback_reply(req, 0);
1971 if (req->rq_no_reply || rc)
1972 ldlm_callback_errmsg(req, "Normal process", rc,
1973 &dlm_req->lock_handle[0]);
1975 if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
1976 ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
1978 case LDLM_CP_CALLBACK:
1979 CDEBUG(D_INODE, "completion ast\n");
1980 req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
1981 ldlm_callback_reply(req, 0);
1982 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
1984 case LDLM_GL_CALLBACK:
1985 CDEBUG(D_INODE, "glimpse ast\n");
1986 req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
1987 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
1990 LBUG(); /* checked above */
1996 static int ldlm_cancel_handler(struct ptlrpc_request *req)
2001 /* Requests arrive in sender's byte order. The ptlrpc service
2002 * handler has already checked and, if necessary, byte-swapped the
2003 * incoming request message body, but I am responsible for the
2004 * message buffers. */
2006 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2008 if (req->rq_export == NULL) {
2009 struct ldlm_request *dlm_req;
2011 CERROR("operation %d from %s with bad export cookie "LPU64"\n",
2012 lustre_msg_get_opc(req->rq_reqmsg),
2013 libcfs_id2str(req->rq_peer),
2014 lustre_msg_get_handle(req->rq_reqmsg)->cookie);
2016 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_CANCEL) {
2017 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2018 dlm_req = req_capsule_client_get(&req->rq_pill,
2020 if (dlm_req != NULL)
2021 ldlm_lock_dump_handle(D_ERROR,
2022 &dlm_req->lock_handle[0]);
2024 ldlm_callback_reply(req, -ENOTCONN);
2028 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2030 /* XXX FIXME move this back to mds/handler.c, bug 249 */
2032 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
2033 CDEBUG(D_INODE, "cancel\n");
2034 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL))
2036 rc = ldlm_handle_cancel(req);
2040 case OBD_LOG_CANCEL:
2041 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
2042 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
2044 rc = llog_origin_handle_cancel(req);
2045 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_REP))
2047 ldlm_callback_reply(req, rc);
2050 CERROR("invalid opcode %d\n",
2051 lustre_msg_get_opc(req->rq_reqmsg));
2052 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2053 ldlm_callback_reply(req, -EINVAL);
2059 void ldlm_revoke_lock_cb(void *obj, void *data)
2061 cfs_list_t *rpc_list = data;
2062 struct ldlm_lock *lock = obj;
2064 lock_res_and_lock(lock);
2066 if (lock->l_req_mode != lock->l_granted_mode) {
2067 unlock_res_and_lock(lock);
2071 LASSERT(lock->l_resource);
2072 if (lock->l_resource->lr_type != LDLM_IBITS &&
2073 lock->l_resource->lr_type != LDLM_PLAIN) {
2074 unlock_res_and_lock(lock);
2078 if (lock->l_flags & LDLM_FL_AST_SENT) {
2079 unlock_res_and_lock(lock);
2083 LASSERT(lock->l_blocking_ast);
2084 LASSERT(!lock->l_blocking_lock);
2086 lock->l_flags |= LDLM_FL_AST_SENT;
2087 if (lock->l_export && lock->l_export->exp_lock_hash &&
2088 !cfs_hlist_unhashed(&lock->l_exp_hash))
2089 cfs_hash_del(lock->l_export->exp_lock_hash,
2090 &lock->l_remote_handle, &lock->l_exp_hash);
2091 cfs_list_add_tail(&lock->l_rk_ast, rpc_list);
2092 LDLM_LOCK_GET(lock);
2094 unlock_res_and_lock(lock);
2097 void ldlm_revoke_export_locks(struct obd_export *exp)
2099 cfs_list_t rpc_list;
2102 CFS_INIT_LIST_HEAD(&rpc_list);
2103 cfs_hash_for_each_empty(exp->exp_lock_hash,
2104 ldlm_revoke_lock_cb, &rpc_list);
2105 ldlm_run_ast_work(&rpc_list, LDLM_WORK_REVOKE_AST);
2111 static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp)
2113 struct ldlm_bl_work_item *blwi = NULL;
2114 static unsigned int num_bl = 0;
2116 cfs_spin_lock(&blp->blp_lock);
2117 /* process a request from the blp_list at least every blp_num_threads */
2118 if (!cfs_list_empty(&blp->blp_list) &&
2119 (cfs_list_empty(&blp->blp_prio_list) || num_bl == 0))
2120 blwi = cfs_list_entry(blp->blp_list.next,
2121 struct ldlm_bl_work_item, blwi_entry);
2123 if (!cfs_list_empty(&blp->blp_prio_list))
2124 blwi = cfs_list_entry(blp->blp_prio_list.next,
2125 struct ldlm_bl_work_item,
2129 if (++num_bl >= cfs_atomic_read(&blp->blp_num_threads))
2131 cfs_list_del(&blwi->blwi_entry);
2133 cfs_spin_unlock(&blp->blp_lock);
2138 /* This only contains temporary data until the thread starts */
2139 struct ldlm_bl_thread_data {
2140 char bltd_name[CFS_CURPROC_COMM_MAX];
2141 struct ldlm_bl_pool *bltd_blp;
2142 cfs_completion_t bltd_comp;
2146 static int ldlm_bl_thread_main(void *arg);
2148 static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp)
2150 struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
2153 cfs_init_completion(&bltd.bltd_comp);
2154 rc = cfs_kernel_thread(ldlm_bl_thread_main, &bltd, 0);
2156 CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %d\n",
2157 cfs_atomic_read(&blp->blp_num_threads), rc);
2160 cfs_wait_for_completion(&bltd.bltd_comp);
2165 static int ldlm_bl_thread_main(void *arg)
2167 struct ldlm_bl_pool *blp;
2171 struct ldlm_bl_thread_data *bltd = arg;
2173 blp = bltd->bltd_blp;
2176 cfs_atomic_inc_return(&blp->blp_num_threads) - 1;
2177 cfs_atomic_inc(&blp->blp_busy_threads);
2179 snprintf(bltd->bltd_name, sizeof(bltd->bltd_name) - 1,
2180 "ldlm_bl_%02d", bltd->bltd_num);
2181 cfs_daemonize(bltd->bltd_name);
2183 cfs_complete(&bltd->bltd_comp);
2184 /* cannot use bltd after this, it is only on caller's stack */
2188 struct l_wait_info lwi = { 0 };
2189 struct ldlm_bl_work_item *blwi = NULL;
2191 blwi = ldlm_bl_get_work(blp);
2196 cfs_atomic_dec(&blp->blp_busy_threads);
2197 l_wait_event_exclusive(blp->blp_waitq,
2198 (blwi = ldlm_bl_get_work(blp)) != NULL,
2200 busy = cfs_atomic_inc_return(&blp->blp_busy_threads);
2202 if (blwi->blwi_ns == NULL)
2203 /* added by ldlm_cleanup() */
2206 /* Not fatal if racy and have a few too many threads */
2207 if (unlikely(busy < blp->blp_max_threads &&
2208 busy >= cfs_atomic_read(&blp->blp_num_threads)))
2209 /* discard the return value, we tried */
2210 ldlm_bl_thread_start(blp);
2212 if (blwi->blwi_ns == NULL)
2213 /* added by ldlm_cleanup() */
2216 if (blwi->blwi_mem_pressure)
2217 cfs_memory_pressure_set();
2219 if (blwi->blwi_count) {
2221 /* The special case when we cancel locks in lru
2222 * asynchronously, we pass the list of locks here.
2223 * Thus locks are marked LDLM_FL_CANCELING, but NOT
2224 * canceled locally yet. */
2225 count = ldlm_cli_cancel_list_local(&blwi->blwi_head,
2228 ldlm_cli_cancel_list(&blwi->blwi_head, count, NULL, 0);
2230 ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
2233 if (blwi->blwi_mem_pressure)
2234 cfs_memory_pressure_clr();
2236 if (blwi->blwi_mode == LDLM_ASYNC)
2237 OBD_FREE(blwi, sizeof(*blwi));
2239 cfs_complete(&blwi->blwi_comp);
2242 cfs_atomic_dec(&blp->blp_busy_threads);
2243 cfs_atomic_dec(&blp->blp_num_threads);
2244 cfs_complete(&blp->blp_comp);
2250 static int ldlm_setup(void);
2251 static int ldlm_cleanup(void);
2253 int ldlm_get_ref(void)
2257 cfs_mutex_down(&ldlm_ref_sem);
2258 if (++ldlm_refcount == 1) {
2263 cfs_mutex_up(&ldlm_ref_sem);
2268 void ldlm_put_ref(void)
2271 cfs_mutex_down(&ldlm_ref_sem);
2272 if (ldlm_refcount == 1) {
2273 int rc = ldlm_cleanup();
2275 CERROR("ldlm_cleanup failed: %d\n", rc);
2281 cfs_mutex_up(&ldlm_ref_sem);
2287 * Export handle<->lock hash operations.
2290 ldlm_export_lock_hash(cfs_hash_t *hs, void *key, unsigned mask)
2292 return cfs_hash_u64_hash(((struct lustre_handle *)key)->cookie, mask);
2296 ldlm_export_lock_key(cfs_hlist_node_t *hnode)
2298 struct ldlm_lock *lock;
2301 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2302 RETURN(&lock->l_remote_handle);
2306 ldlm_export_lock_compare(void *key, cfs_hlist_node_t *hnode)
2309 RETURN(lustre_handle_equal(ldlm_export_lock_key(hnode), key));
2313 ldlm_export_lock_get(cfs_hlist_node_t *hnode)
2315 struct ldlm_lock *lock;
2318 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2319 LDLM_LOCK_GET(lock);
2325 ldlm_export_lock_put(cfs_hlist_node_t *hnode)
2327 struct ldlm_lock *lock;
2330 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2331 LDLM_LOCK_RELEASE(lock);
2336 static cfs_hash_ops_t ldlm_export_lock_ops = {
2337 .hs_hash = ldlm_export_lock_hash,
2338 .hs_key = ldlm_export_lock_key,
2339 .hs_compare = ldlm_export_lock_compare,
2340 .hs_get = ldlm_export_lock_get,
2341 .hs_put = ldlm_export_lock_put
2344 int ldlm_init_export(struct obd_export *exp)
2348 exp->exp_lock_hash =
2349 cfs_hash_create(obd_uuid2str(&exp->exp_client_uuid),
2350 HASH_EXP_LOCK_CUR_BITS, HASH_EXP_LOCK_MAX_BITS,
2351 &ldlm_export_lock_ops, CFS_HASH_REHASH);
2353 if (!exp->exp_lock_hash)
2358 EXPORT_SYMBOL(ldlm_init_export);
2360 void ldlm_destroy_export(struct obd_export *exp)
2363 cfs_hash_putref(exp->exp_lock_hash);
2364 exp->exp_lock_hash = NULL;
2367 EXPORT_SYMBOL(ldlm_destroy_export);
2369 static int ldlm_setup(void)
2371 struct ldlm_bl_pool *blp;
2373 int ldlm_min_threads = LDLM_THREADS_AUTO_MIN;
2374 int ldlm_max_threads = LDLM_THREADS_AUTO_MAX;
2380 if (ldlm_state != NULL)
2383 OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
2384 if (ldlm_state == NULL)
2388 rc = ldlm_proc_setup();
2394 if (ldlm_num_threads) {
2395 /* If ldlm_num_threads is set, it is the min and the max. */
2396 if (ldlm_num_threads > LDLM_THREADS_AUTO_MAX)
2397 ldlm_num_threads = LDLM_THREADS_AUTO_MAX;
2398 if (ldlm_num_threads < LDLM_THREADS_AUTO_MIN)
2399 ldlm_num_threads = LDLM_THREADS_AUTO_MIN;
2400 ldlm_min_threads = ldlm_max_threads = ldlm_num_threads;
2404 ldlm_state->ldlm_cb_service =
2405 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2406 LDLM_MAXREPSIZE, LDLM_CB_REQUEST_PORTAL,
2407 LDLM_CB_REPLY_PORTAL, 2,
2408 ldlm_callback_handler, "ldlm_cbd",
2409 ldlm_svc_proc_dir, NULL,
2410 ldlm_min_threads, ldlm_max_threads,
2412 LCT_MD_THREAD|LCT_DT_THREAD, NULL);
2414 if (!ldlm_state->ldlm_cb_service) {
2415 CERROR("failed to start service\n");
2416 GOTO(out_proc, rc = -ENOMEM);
2419 ldlm_state->ldlm_cancel_service =
2420 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2421 LDLM_MAXREPSIZE, LDLM_CANCEL_REQUEST_PORTAL,
2422 LDLM_CANCEL_REPLY_PORTAL, 6,
2423 ldlm_cancel_handler, "ldlm_canceld",
2424 ldlm_svc_proc_dir, NULL,
2425 ldlm_min_threads, ldlm_max_threads,
2427 LCT_MD_THREAD|LCT_DT_THREAD|LCT_CL_THREAD,
2430 if (!ldlm_state->ldlm_cancel_service) {
2431 CERROR("failed to start service\n");
2432 GOTO(out_proc, rc = -ENOMEM);
2435 OBD_ALLOC(blp, sizeof(*blp));
2437 GOTO(out_proc, rc = -ENOMEM);
2438 ldlm_state->ldlm_bl_pool = blp;
2440 cfs_spin_lock_init(&blp->blp_lock);
2441 CFS_INIT_LIST_HEAD(&blp->blp_list);
2442 CFS_INIT_LIST_HEAD(&blp->blp_prio_list);
2443 cfs_waitq_init(&blp->blp_waitq);
2444 cfs_atomic_set(&blp->blp_num_threads, 0);
2445 cfs_atomic_set(&blp->blp_busy_threads, 0);
2446 blp->blp_min_threads = ldlm_min_threads;
2447 blp->blp_max_threads = ldlm_max_threads;
2450 for (i = 0; i < blp->blp_min_threads; i++) {
2451 rc = ldlm_bl_thread_start(blp);
2453 GOTO(out_thread, rc);
2456 rc = ptlrpc_start_threads(NULL, ldlm_state->ldlm_cancel_service);
2458 GOTO(out_thread, rc);
2460 rc = ptlrpc_start_threads(NULL, ldlm_state->ldlm_cb_service);
2462 GOTO(out_thread, rc);
2464 CFS_INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
2465 expired_lock_thread.elt_state = ELT_STOPPED;
2466 cfs_waitq_init(&expired_lock_thread.elt_waitq);
2468 CFS_INIT_LIST_HEAD(&waiting_locks_list);
2469 cfs_spin_lock_init(&waiting_locks_spinlock);
2470 cfs_timer_init(&waiting_locks_timer, waiting_locks_callback, 0);
2472 rc = cfs_kernel_thread(expired_lock_main, NULL, CLONE_VM | CLONE_FILES);
2474 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
2475 GOTO(out_thread, rc);
2478 cfs_wait_event(expired_lock_thread.elt_waitq,
2479 expired_lock_thread.elt_state == ELT_READY);
2483 rc = ldlm_pools_init();
2485 GOTO(out_thread, rc);
2491 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2492 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2497 ldlm_proc_cleanup();
2500 OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2505 static int ldlm_cleanup(void)
2508 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
2512 if (!cfs_list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) ||
2513 !cfs_list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) {
2514 CERROR("ldlm still has namespaces; clean these up first.\n");
2515 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
2516 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
2525 while (cfs_atomic_read(&blp->blp_num_threads) > 0) {
2526 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
2528 cfs_init_completion(&blp->blp_comp);
2530 cfs_spin_lock(&blp->blp_lock);
2531 cfs_list_add_tail(&blwi.blwi_entry, &blp->blp_list);
2532 cfs_waitq_signal(&blp->blp_waitq);
2533 cfs_spin_unlock(&blp->blp_lock);
2535 cfs_wait_for_completion(&blp->blp_comp);
2537 OBD_FREE(blp, sizeof(*blp));
2539 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2540 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2541 ldlm_proc_cleanup();
2543 expired_lock_thread.elt_state = ELT_TERMINATE;
2544 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
2545 cfs_wait_event(expired_lock_thread.elt_waitq,
2546 expired_lock_thread.elt_state == ELT_STOPPED);
2548 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2549 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2552 OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2558 int __init ldlm_init(void)
2560 cfs_init_mutex(&ldlm_ref_sem);
2561 cfs_init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER));
2562 cfs_init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
2563 ldlm_resource_slab = cfs_mem_cache_create("ldlm_resources",
2564 sizeof(struct ldlm_resource), 0,
2565 CFS_SLAB_HWCACHE_ALIGN);
2566 if (ldlm_resource_slab == NULL)
2569 ldlm_lock_slab = cfs_mem_cache_create("ldlm_locks",
2570 sizeof(struct ldlm_lock), 0,
2571 CFS_SLAB_HWCACHE_ALIGN | CFS_SLAB_DESTROY_BY_RCU);
2572 if (ldlm_lock_slab == NULL) {
2573 cfs_mem_cache_destroy(ldlm_resource_slab);
2577 ldlm_interval_slab = cfs_mem_cache_create("interval_node",
2578 sizeof(struct ldlm_interval),
2579 0, CFS_SLAB_HWCACHE_ALIGN);
2580 if (ldlm_interval_slab == NULL) {
2581 cfs_mem_cache_destroy(ldlm_resource_slab);
2582 cfs_mem_cache_destroy(ldlm_lock_slab);
2585 #if LUSTRE_TRACKS_LOCK_EXP_REFS
2586 class_export_dump_hook = ldlm_dump_export_locks;
2591 void __exit ldlm_exit(void)
2595 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
2596 rc = cfs_mem_cache_destroy(ldlm_resource_slab);
2597 LASSERTF(rc == 0, "couldn't free ldlm resource slab\n");
2599 /* ldlm_lock_put() use RCU to call ldlm_lock_free, so need call
2600 * synchronize_rcu() to wait a grace period elapsed, so that
2601 * ldlm_lock_free() get a chance to be called. */
2604 rc = cfs_mem_cache_destroy(ldlm_lock_slab);
2605 LASSERTF(rc == 0, "couldn't free ldlm lock slab\n");
2606 rc = cfs_mem_cache_destroy(ldlm_interval_slab);
2607 LASSERTF(rc == 0, "couldn't free interval node slab\n");
2611 EXPORT_SYMBOL(ldlm_extent_shift_kms);
2614 EXPORT_SYMBOL(ldlm_get_processing_policy);
2615 EXPORT_SYMBOL(ldlm_lock2desc);
2616 EXPORT_SYMBOL(ldlm_register_intent);
2617 EXPORT_SYMBOL(ldlm_lockname);
2618 EXPORT_SYMBOL(ldlm_typename);
2619 EXPORT_SYMBOL(ldlm_lock2handle);
2620 EXPORT_SYMBOL(__ldlm_handle2lock);
2621 EXPORT_SYMBOL(ldlm_lock_get);
2622 EXPORT_SYMBOL(ldlm_lock_put);
2623 EXPORT_SYMBOL(ldlm_lock_match);
2624 EXPORT_SYMBOL(ldlm_lock_cancel);
2625 EXPORT_SYMBOL(ldlm_lock_addref);
2626 EXPORT_SYMBOL(ldlm_lock_addref_try);
2627 EXPORT_SYMBOL(ldlm_lock_decref);
2628 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
2629 EXPORT_SYMBOL(ldlm_lock_change_resource);
2630 EXPORT_SYMBOL(ldlm_it2str);
2631 EXPORT_SYMBOL(ldlm_lock_dump);
2632 EXPORT_SYMBOL(ldlm_lock_dump_handle);
2633 EXPORT_SYMBOL(ldlm_reprocess_all_ns);
2634 EXPORT_SYMBOL(ldlm_lock_allow_match_locked);
2635 EXPORT_SYMBOL(ldlm_lock_allow_match);
2636 EXPORT_SYMBOL(ldlm_lock_downgrade);
2637 EXPORT_SYMBOL(ldlm_lock_convert);
2639 /* ldlm_request.c */
2640 EXPORT_SYMBOL(ldlm_completion_ast_async);
2641 EXPORT_SYMBOL(ldlm_blocking_ast_nocheck);
2642 EXPORT_SYMBOL(ldlm_completion_ast);
2643 EXPORT_SYMBOL(ldlm_blocking_ast);
2644 EXPORT_SYMBOL(ldlm_glimpse_ast);
2645 EXPORT_SYMBOL(ldlm_expired_completion_wait);
2646 EXPORT_SYMBOL(ldlm_prep_enqueue_req);
2647 EXPORT_SYMBOL(ldlm_prep_elc_req);
2648 EXPORT_SYMBOL(ldlm_cli_convert);
2649 EXPORT_SYMBOL(ldlm_cli_enqueue);
2650 EXPORT_SYMBOL(ldlm_cli_enqueue_fini);
2651 EXPORT_SYMBOL(ldlm_cli_enqueue_local);
2652 EXPORT_SYMBOL(ldlm_cli_cancel);
2653 EXPORT_SYMBOL(ldlm_cli_cancel_unused);
2654 EXPORT_SYMBOL(ldlm_cli_cancel_unused_resource);
2655 EXPORT_SYMBOL(ldlm_cli_cancel_req);
2656 EXPORT_SYMBOL(ldlm_replay_locks);
2657 EXPORT_SYMBOL(ldlm_resource_foreach);
2658 EXPORT_SYMBOL(ldlm_namespace_foreach);
2659 EXPORT_SYMBOL(ldlm_namespace_foreach_res);
2660 EXPORT_SYMBOL(ldlm_resource_iterate);
2661 EXPORT_SYMBOL(ldlm_cancel_resource_local);
2662 EXPORT_SYMBOL(ldlm_cli_cancel_list_local);
2663 EXPORT_SYMBOL(ldlm_cli_cancel_list);
2666 EXPORT_SYMBOL(ldlm_server_blocking_ast);
2667 EXPORT_SYMBOL(ldlm_server_completion_ast);
2668 EXPORT_SYMBOL(ldlm_server_glimpse_ast);
2669 EXPORT_SYMBOL(ldlm_handle_enqueue);
2670 EXPORT_SYMBOL(ldlm_handle_enqueue0);
2671 EXPORT_SYMBOL(ldlm_handle_cancel);
2672 EXPORT_SYMBOL(ldlm_request_cancel);
2673 EXPORT_SYMBOL(ldlm_handle_convert);
2674 EXPORT_SYMBOL(ldlm_handle_convert0);
2675 EXPORT_SYMBOL(ldlm_del_waiting_lock);
2676 EXPORT_SYMBOL(ldlm_get_ref);
2677 EXPORT_SYMBOL(ldlm_put_ref);
2678 EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
2679 EXPORT_SYMBOL(ldlm_revoke_export_locks);
2681 /* ldlm_resource.c */
2682 EXPORT_SYMBOL(ldlm_namespace_new);
2683 EXPORT_SYMBOL(ldlm_namespace_cleanup);
2684 EXPORT_SYMBOL(ldlm_namespace_free);
2685 EXPORT_SYMBOL(ldlm_namespace_dump);
2686 EXPORT_SYMBOL(ldlm_dump_all_namespaces);
2687 EXPORT_SYMBOL(ldlm_resource_get);
2688 EXPORT_SYMBOL(ldlm_resource_putref);
2689 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
2692 EXPORT_SYMBOL(client_import_add_conn);
2693 EXPORT_SYMBOL(client_import_del_conn);
2694 EXPORT_SYMBOL(client_obd_setup);
2695 EXPORT_SYMBOL(client_obd_cleanup);
2696 EXPORT_SYMBOL(client_connect_import);
2697 EXPORT_SYMBOL(client_disconnect_export);
2698 EXPORT_SYMBOL(server_disconnect_export);
2699 EXPORT_SYMBOL(target_stop_recovery_thread);
2700 EXPORT_SYMBOL(target_handle_connect);
2701 EXPORT_SYMBOL(target_cleanup_recovery);
2702 EXPORT_SYMBOL(target_destroy_export);
2703 EXPORT_SYMBOL(target_cancel_recovery_timer);
2704 EXPORT_SYMBOL(target_send_reply);
2705 EXPORT_SYMBOL(target_queue_recovery_request);
2706 EXPORT_SYMBOL(target_handle_ping);
2707 EXPORT_SYMBOL(target_pack_pool_reply);
2708 EXPORT_SYMBOL(target_handle_disconnect);
2711 EXPORT_SYMBOL(lock_res_and_lock);
2712 EXPORT_SYMBOL(unlock_res_and_lock);