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_bh(&lock->l_export->exp_rpc_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_bh(&lock->l_export->exp_rpc_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 ldlm_lock_to_ns(lock)->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 struct ldlm_resource *res = lock->l_resource;
611 LDLM_DEBUG(lock, "client (nid %s) returned %d"
612 " from %s AST - normal race",
613 libcfs_nid2str(peer.nid),
615 lustre_msg_get_status(req->rq_repmsg) : -1,
618 /* update lvbo to return proper attributes.
620 ldlm_resource_getref(res);
621 ldlm_res_lvbo_update(res, NULL, 1);
622 ldlm_resource_putref(res);
626 LDLM_ERROR(lock, "client (nid %s) returned %d "
627 "from %s AST", libcfs_nid2str(peer.nid),
628 (req->rq_repmsg != NULL) ?
629 lustre_msg_get_status(req->rq_repmsg) : 0,
632 ldlm_lock_cancel(lock);
633 /* Server-side AST functions are called from ldlm_reprocess_all,
634 * which needs to be told to please restart its reprocessing. */
641 static int ldlm_cb_interpret(const struct lu_env *env,
642 struct ptlrpc_request *req, void *data, int rc)
644 struct ldlm_cb_set_arg *arg;
645 struct ldlm_lock *lock;
648 LASSERT(data != NULL);
650 arg = req->rq_async_args.pointer_arg[0];
651 lock = req->rq_async_args.pointer_arg[1];
652 LASSERT(lock != NULL);
654 rc = ldlm_handle_ast_error(lock, req, rc,
655 arg->type == LDLM_BL_CALLBACK
656 ? "blocking" : "completion");
659 LDLM_LOCK_RELEASE(lock);
662 cfs_atomic_set(&arg->restart, 1);
667 static inline int ldlm_bl_and_cp_ast_fini(struct ptlrpc_request *req,
668 struct ldlm_cb_set_arg *arg,
669 struct ldlm_lock *lock,
675 if (unlikely(instant_cancel)) {
676 rc = ptl_send_rpc(req, 1);
677 ptlrpc_req_finished(req);
679 /* If we cancelled the lock, we need to restart
680 * ldlm_reprocess_queue */
681 cfs_atomic_set(&arg->restart, 1);
684 ptlrpc_set_add_req(arg->set, req);
691 * Check if there are requests in the export request list which prevent
692 * the lock canceling and make these requests high priority ones.
694 static void ldlm_lock_reorder_req(struct ldlm_lock *lock)
696 struct ptlrpc_request *req;
699 if (lock->l_export == NULL) {
700 LDLM_DEBUG(lock, "client lock: no-op");
704 cfs_spin_lock_bh(&lock->l_export->exp_rpc_lock);
705 cfs_list_for_each_entry(req, &lock->l_export->exp_queued_rpc,
707 if (!req->rq_hp && req->rq_ops->hpreq_lock_match &&
708 req->rq_ops->hpreq_lock_match(req, lock))
709 ptlrpc_hpreq_reorder(req);
711 cfs_spin_unlock_bh(&lock->l_export->exp_rpc_lock);
716 * ->l_blocking_ast() method for server-side locks. This is invoked when newly
717 * enqueued server lock conflicts with given one.
719 * Sends blocking ast rpc to the client owning that lock; arms timeout timer
720 * to wait for client response.
722 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
723 struct ldlm_lock_desc *desc,
724 void *data, int flag)
726 struct ldlm_cb_set_arg *arg = data;
727 struct ldlm_request *body;
728 struct ptlrpc_request *req;
729 int instant_cancel = 0;
733 if (flag == LDLM_CB_CANCELING)
734 /* Don't need to do anything here. */
738 LASSERT(data != NULL);
739 if (lock->l_export->exp_obd->obd_recovering != 0) {
740 LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
741 ldlm_lock_dump(D_ERROR, lock, 0);
744 ldlm_lock_reorder_req(lock);
746 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
747 &RQF_LDLM_BL_CALLBACK,
748 LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK);
752 req->rq_async_args.pointer_arg[0] = arg;
753 req->rq_async_args.pointer_arg[1] = lock;
754 req->rq_interpret_reply = ldlm_cb_interpret;
755 req->rq_no_resend = 1;
757 lock_res(lock->l_resource);
758 if (lock->l_granted_mode != lock->l_req_mode) {
759 /* this blocking AST will be communicated as part of the
760 * completion AST instead */
761 unlock_res(lock->l_resource);
762 ptlrpc_req_finished(req);
763 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
767 if (lock->l_destroyed) {
768 /* What's the point? */
769 unlock_res(lock->l_resource);
770 ptlrpc_req_finished(req);
774 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
777 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
778 body->lock_handle[0] = lock->l_remote_handle;
779 body->lock_desc = *desc;
780 body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
782 LDLM_DEBUG(lock, "server preparing blocking AST");
784 ptlrpc_request_set_replen(req);
785 if (instant_cancel) {
786 unlock_res(lock->l_resource);
787 ldlm_lock_cancel(lock);
789 LASSERT(lock->l_granted_mode == lock->l_req_mode);
790 ldlm_add_waiting_lock(lock);
791 unlock_res(lock->l_resource);
794 req->rq_send_state = LUSTRE_IMP_FULL;
795 /* ptlrpc_request_alloc_pack already set timeout */
797 req->rq_timeout = ldlm_get_rq_timeout();
799 if (lock->l_export && lock->l_export->exp_nid_stats &&
800 lock->l_export->exp_nid_stats->nid_ldlm_stats)
801 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
802 LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
804 rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
809 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data)
811 struct ldlm_cb_set_arg *arg = data;
812 struct ldlm_request *body;
813 struct ptlrpc_request *req;
814 long total_enqueue_wait;
815 int instant_cancel = 0;
819 LASSERT(lock != NULL);
820 LASSERT(data != NULL);
822 total_enqueue_wait = cfs_time_sub(cfs_time_current_sec(),
823 lock->l_last_activity);
825 req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse,
826 &RQF_LDLM_CP_CALLBACK);
830 /* server namespace, doesn't need lock */
831 if (lock->l_resource->lr_lvb_len) {
832 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT,
833 lock->l_resource->lr_lvb_len);
836 rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK);
838 ptlrpc_request_free(req);
842 req->rq_async_args.pointer_arg[0] = arg;
843 req->rq_async_args.pointer_arg[1] = lock;
844 req->rq_interpret_reply = ldlm_cb_interpret;
845 req->rq_no_resend = 1;
846 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
848 body->lock_handle[0] = lock->l_remote_handle;
849 body->lock_flags = flags;
850 ldlm_lock2desc(lock, &body->lock_desc);
851 if (lock->l_resource->lr_lvb_len) {
852 void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB);
854 lock_res_and_lock(lock);
855 memcpy(lvb, lock->l_resource->lr_lvb_data,
856 lock->l_resource->lr_lvb_len);
857 unlock_res_and_lock(lock);
860 LDLM_DEBUG(lock, "server preparing completion AST (after %lds wait)",
863 /* Server-side enqueue wait time estimate, used in
864 __ldlm_add_waiting_lock to set future enqueue timers */
865 if (total_enqueue_wait < ldlm_get_enq_timeout(lock))
866 at_measured(ldlm_lock_to_ns_at(lock),
869 /* bz18618. Don't add lock enqueue time we spend waiting for a
870 previous callback to fail. Locks waiting legitimately will
871 get extended by ldlm_refresh_waiting_lock regardless of the
872 estimate, so it's okay to underestimate here. */
873 LDLM_DEBUG(lock, "lock completed after %lus; estimate was %ds. "
874 "It is likely that a previous callback timed out.",
876 at_get(ldlm_lock_to_ns_at(lock)));
878 ptlrpc_request_set_replen(req);
880 req->rq_send_state = LUSTRE_IMP_FULL;
881 /* ptlrpc_request_pack already set timeout */
883 req->rq_timeout = ldlm_get_rq_timeout();
885 /* We only send real blocking ASTs after the lock is granted */
886 lock_res_and_lock(lock);
887 if (lock->l_flags & LDLM_FL_AST_SENT) {
888 body->lock_flags |= LDLM_FL_AST_SENT;
889 /* copy ast flags like LDLM_FL_DISCARD_DATA */
890 body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
892 /* We might get here prior to ldlm_handle_enqueue setting
893 * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
894 * into waiting list, but this is safe and similar code in
895 * ldlm_handle_enqueue will call ldlm_lock_cancel() still,
896 * that would not only cancel the lock, but will also remove
897 * it from waiting list */
898 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
899 unlock_res_and_lock(lock);
900 ldlm_lock_cancel(lock);
902 lock_res_and_lock(lock);
904 /* start the lock-timeout clock */
905 ldlm_add_waiting_lock(lock);
908 unlock_res_and_lock(lock);
910 if (lock->l_export && lock->l_export->exp_nid_stats &&
911 lock->l_export->exp_nid_stats->nid_ldlm_stats)
912 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
913 LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
915 rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
920 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
922 struct ldlm_resource *res = lock->l_resource;
923 struct ldlm_request *body;
924 struct ptlrpc_request *req;
928 LASSERT(lock != NULL);
930 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
931 &RQF_LDLM_GL_CALLBACK,
932 LUSTRE_DLM_VERSION, LDLM_GL_CALLBACK);
937 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
938 body->lock_handle[0] = lock->l_remote_handle;
939 ldlm_lock2desc(lock, &body->lock_desc);
941 /* server namespace, doesn't need lock */
942 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
943 lock->l_resource->lr_lvb_len);
944 res = lock->l_resource;
945 ptlrpc_request_set_replen(req);
948 req->rq_send_state = LUSTRE_IMP_FULL;
949 /* ptlrpc_request_alloc_pack already set timeout */
951 req->rq_timeout = ldlm_get_rq_timeout();
953 if (lock->l_export && lock->l_export->exp_nid_stats &&
954 lock->l_export->exp_nid_stats->nid_ldlm_stats)
955 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
956 LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
958 rc = ptlrpc_queue_wait(req);
959 if (rc == -ELDLM_NO_LOCK_DATA)
960 LDLM_DEBUG(lock, "lost race - client has a lock but no inode");
962 rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
964 rc = ldlm_res_lvbo_update(res, req, 1);
966 ptlrpc_req_finished(req);
968 ldlm_reprocess_all(res);
974 extern unsigned long long lu_time_stamp_get(void);
976 #define lu_time_stamp_get() time(NULL)
979 static void ldlm_svc_get_eopc(const struct ldlm_request *dlm_req,
980 struct lprocfs_stats *srv_stats)
982 int lock_type = 0, op = 0;
984 lock_type = dlm_req->lock_desc.l_resource.lr_type;
988 op = PTLRPC_LAST_CNTR + LDLM_PLAIN_ENQUEUE;
991 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT)
992 op = PTLRPC_LAST_CNTR + LDLM_GLIMPSE_ENQUEUE;
994 op = PTLRPC_LAST_CNTR + LDLM_EXTENT_ENQUEUE;
997 op = PTLRPC_LAST_CNTR + LDLM_FLOCK_ENQUEUE;
1000 op = PTLRPC_LAST_CNTR + LDLM_IBITS_ENQUEUE;
1008 lprocfs_counter_incr(srv_stats, op);
1014 * Main server-side entry point into LDLM. This is called by ptlrpc service
1015 * threads to carry out client lock enqueueing requests.
1017 int ldlm_handle_enqueue0(struct ldlm_namespace *ns,
1018 struct ptlrpc_request *req,
1019 const struct ldlm_request *dlm_req,
1020 const struct ldlm_callback_suite *cbs)
1022 struct ldlm_reply *dlm_rep;
1024 ldlm_error_t err = ELDLM_OK;
1025 struct ldlm_lock *lock = NULL;
1026 void *cookie = NULL;
1030 LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
1032 ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF);
1033 flags = dlm_req->lock_flags;
1035 LASSERT(req->rq_export);
1037 if (req->rq_rqbd->rqbd_service->srv_stats)
1038 ldlm_svc_get_eopc(dlm_req,
1039 req->rq_rqbd->rqbd_service->srv_stats);
1041 if (req->rq_export && req->rq_export->exp_nid_stats &&
1042 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1043 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1044 LDLM_ENQUEUE - LDLM_FIRST_OPC);
1046 if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE ||
1047 dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) {
1048 DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
1049 dlm_req->lock_desc.l_resource.lr_type);
1050 GOTO(out, rc = -EFAULT);
1053 if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE ||
1054 dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE ||
1055 dlm_req->lock_desc.l_req_mode &
1056 (dlm_req->lock_desc.l_req_mode-1))) {
1057 DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
1058 dlm_req->lock_desc.l_req_mode);
1059 GOTO(out, rc = -EFAULT);
1062 if (req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) {
1063 if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1065 DEBUG_REQ(D_ERROR, req,
1066 "PLAIN lock request from IBITS client?");
1067 GOTO(out, rc = -EPROTO);
1069 } else if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1071 DEBUG_REQ(D_ERROR, req,
1072 "IBITS lock request from unaware client?");
1073 GOTO(out, rc = -EPROTO);
1077 /* FIXME this makes it impossible to use LDLM_PLAIN locks -- check
1078 against server's _CONNECT_SUPPORTED flags? (I don't want to use
1079 ibits for mgc/mgs) */
1081 /* INODEBITS_INTEROP: Perform conversion from plain lock to
1082 * inodebits lock if client does not support them. */
1083 if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) &&
1084 (dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN)) {
1085 dlm_req->lock_desc.l_resource.lr_type = LDLM_IBITS;
1086 dlm_req->lock_desc.l_policy_data.l_inodebits.bits =
1087 MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE;
1088 if (dlm_req->lock_desc.l_req_mode == LCK_PR)
1089 dlm_req->lock_desc.l_req_mode = LCK_CR;
1093 if (unlikely(flags & LDLM_FL_REPLAY)) {
1094 /* Find an existing lock in the per-export lock hash */
1095 lock = cfs_hash_lookup(req->rq_export->exp_lock_hash,
1096 (void *)&dlm_req->lock_handle[0]);
1098 DEBUG_REQ(D_DLMTRACE, req, "found existing lock cookie "
1099 LPX64, lock->l_handle.h_cookie);
1100 GOTO(existing_lock, rc = 0);
1104 /* The lock's callback data might be set in the policy function */
1105 lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
1106 dlm_req->lock_desc.l_resource.lr_type,
1107 dlm_req->lock_desc.l_req_mode,
1111 GOTO(out, rc = -ENOMEM);
1113 lock->l_last_activity = cfs_time_current_sec();
1114 lock->l_remote_handle = dlm_req->lock_handle[0];
1115 LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
1117 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
1118 /* Don't enqueue a lock onto the export if it has already
1119 * been evicted. Cancel it now instead. (bug 3822) */
1120 if (req->rq_export->exp_failed) {
1121 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1122 GOTO(out, rc = -ENOTCONN);
1125 lock->l_export = class_export_lock_get(req->rq_export, lock);
1126 if (lock->l_export->exp_lock_hash)
1127 cfs_hash_add(lock->l_export->exp_lock_hash,
1128 &lock->l_remote_handle,
1133 if (flags & LDLM_FL_HAS_INTENT) {
1134 /* In this case, the reply buffer is allocated deep in
1135 * local_lock_enqueue by the policy function. */
1138 lock_res_and_lock(lock);
1139 if (lock->l_resource->lr_lvb_len) {
1140 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
1142 lock->l_resource->lr_lvb_len);
1144 unlock_res_and_lock(lock);
1146 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
1147 GOTO(out, rc = -ENOMEM);
1149 rc = req_capsule_server_pack(&req->rq_pill);
1154 if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN)
1155 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1156 if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
1157 lock->l_req_extent = lock->l_policy_data.l_extent;
1159 err = ldlm_lock_enqueue(ns, &lock, cookie, (int *)&flags);
1163 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1164 dlm_rep->lock_flags = flags;
1166 ldlm_lock2desc(lock, &dlm_rep->lock_desc);
1167 ldlm_lock2handle(lock, &dlm_rep->lock_handle);
1169 /* We never send a blocking AST until the lock is granted, but
1170 * we can tell it right now */
1171 lock_res_and_lock(lock);
1173 /* Now take into account flags to be inherited from original lock
1174 request both in reply to client and in our own lock flags. */
1175 dlm_rep->lock_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1176 lock->l_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1178 /* Don't move a pending lock onto the export if it has already
1179 * been evicted. Cancel it now instead. (bug 5683) */
1180 if (unlikely(req->rq_export->exp_failed ||
1181 OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
1182 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1184 } else if (lock->l_flags & LDLM_FL_AST_SENT) {
1185 dlm_rep->lock_flags |= LDLM_FL_AST_SENT;
1186 if (lock->l_granted_mode == lock->l_req_mode) {
1188 * Only cancel lock if it was granted, because it would
1189 * be destroyed immediately and would never be granted
1190 * in the future, causing timeouts on client. Not
1191 * granted lock will be cancelled immediately after
1192 * sending completion AST.
1194 if (dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1195 unlock_res_and_lock(lock);
1196 ldlm_lock_cancel(lock);
1197 lock_res_and_lock(lock);
1199 ldlm_add_waiting_lock(lock);
1202 /* Make sure we never ever grant usual metadata locks to liblustre
1204 if ((dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN ||
1205 dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) &&
1206 req->rq_export->exp_libclient) {
1207 if (unlikely(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) ||
1208 !(dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK))){
1209 CERROR("Granting sync lock to libclient. "
1210 "req fl %d, rep fl %d, lock fl "LPX64"\n",
1211 dlm_req->lock_flags, dlm_rep->lock_flags,
1213 LDLM_ERROR(lock, "sync lock");
1214 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT) {
1215 struct ldlm_intent *it;
1217 it = req_capsule_client_get(&req->rq_pill,
1220 CERROR("This is intent %s ("LPU64")\n",
1221 ldlm_it2str(it->opc), it->opc);
1227 unlock_res_and_lock(lock);
1231 req->rq_status = rc ?: err; /* return either error - bug 11190 */
1232 if (!req->rq_packed_final) {
1233 err = lustre_pack_reply(req, 1, NULL, NULL);
1238 /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
1239 * ldlm_reprocess_all. If this moves, revisit that code. -phil */
1241 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
1242 "(err=%d, rc=%d)", err, rc);
1244 lock_res_and_lock(lock);
1246 if (lock->l_resource->lr_lvb_len > 0) {
1249 lvb = req_capsule_server_get(&req->rq_pill,
1251 LASSERTF(lvb != NULL, "req %p, lock %p\n",
1254 memcpy(lvb, lock->l_resource->lr_lvb_data,
1255 lock->l_resource->lr_lvb_len);
1258 ldlm_resource_unlink_lock(lock);
1259 ldlm_lock_destroy_nolock(lock);
1261 unlock_res_and_lock(lock);
1263 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
1264 ldlm_reprocess_all(lock->l_resource);
1266 LDLM_LOCK_RELEASE(lock);
1269 LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
1275 int ldlm_handle_enqueue(struct ptlrpc_request *req,
1276 ldlm_completion_callback completion_callback,
1277 ldlm_blocking_callback blocking_callback,
1278 ldlm_glimpse_callback glimpse_callback)
1280 struct ldlm_request *dlm_req;
1281 struct ldlm_callback_suite cbs = {
1282 .lcs_completion = completion_callback,
1283 .lcs_blocking = blocking_callback,
1284 .lcs_glimpse = glimpse_callback
1288 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1289 if (dlm_req != NULL) {
1290 rc = ldlm_handle_enqueue0(req->rq_export->exp_obd->obd_namespace,
1291 req, dlm_req, &cbs);
1298 int ldlm_handle_convert0(struct ptlrpc_request *req,
1299 const struct ldlm_request *dlm_req)
1301 struct ldlm_reply *dlm_rep;
1302 struct ldlm_lock *lock;
1306 if (req->rq_export && req->rq_export->exp_nid_stats &&
1307 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1308 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1309 LDLM_CONVERT - LDLM_FIRST_OPC);
1311 rc = req_capsule_server_pack(&req->rq_pill);
1315 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1316 dlm_rep->lock_flags = dlm_req->lock_flags;
1318 lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
1320 req->rq_status = EINVAL;
1324 LDLM_DEBUG(lock, "server-side convert handler START");
1326 lock->l_last_activity = cfs_time_current_sec();
1327 res = ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
1328 &dlm_rep->lock_flags);
1330 if (ldlm_del_waiting_lock(lock))
1331 LDLM_DEBUG(lock, "converted waiting lock");
1334 req->rq_status = EDEADLOCK;
1339 if (!req->rq_status)
1340 ldlm_reprocess_all(lock->l_resource);
1341 LDLM_DEBUG(lock, "server-side convert handler END");
1342 LDLM_LOCK_PUT(lock);
1344 LDLM_DEBUG_NOLOCK("server-side convert handler END");
1349 int ldlm_handle_convert(struct ptlrpc_request *req)
1352 struct ldlm_request *dlm_req;
1354 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1355 if (dlm_req != NULL) {
1356 rc = ldlm_handle_convert0(req, dlm_req);
1358 CERROR ("Can't unpack dlm_req\n");
1364 /* Cancel all the locks whos handles are packed into ldlm_request */
1365 int ldlm_request_cancel(struct ptlrpc_request *req,
1366 const struct ldlm_request *dlm_req, int first)
1368 struct ldlm_resource *res, *pres = NULL;
1369 struct ldlm_lock *lock;
1370 int i, count, done = 0;
1373 count = dlm_req->lock_count ? dlm_req->lock_count : 1;
1377 /* There is no lock on the server at the replay time,
1378 * skip lock cancelling to make replay tests to pass. */
1379 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1382 LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, "
1383 "starting at %d", count, first);
1385 for (i = first; i < count; i++) {
1386 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
1388 LDLM_DEBUG_NOLOCK("server-side cancel handler stale "
1389 "lock (cookie "LPU64")",
1390 dlm_req->lock_handle[i].cookie);
1394 res = lock->l_resource;
1399 ldlm_reprocess_all(pres);
1400 LDLM_RESOURCE_DELREF(pres);
1401 ldlm_resource_putref(pres);
1404 ldlm_resource_getref(res);
1405 LDLM_RESOURCE_ADDREF(res);
1406 ldlm_res_lvbo_update(res, NULL, 1);
1410 ldlm_lock_cancel(lock);
1411 LDLM_LOCK_PUT(lock);
1414 ldlm_reprocess_all(pres);
1415 LDLM_RESOURCE_DELREF(pres);
1416 ldlm_resource_putref(pres);
1418 LDLM_DEBUG_NOLOCK("server-side cancel handler END");
1422 int ldlm_handle_cancel(struct ptlrpc_request *req)
1424 struct ldlm_request *dlm_req;
1428 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1429 if (dlm_req == NULL) {
1430 CDEBUG(D_INFO, "bad request buffer for cancel\n");
1434 if (req->rq_export && req->rq_export->exp_nid_stats &&
1435 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1436 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1437 LDLM_CANCEL - LDLM_FIRST_OPC);
1439 rc = req_capsule_server_pack(&req->rq_pill);
1443 if (!ldlm_request_cancel(req, dlm_req, 0))
1444 req->rq_status = ESTALE;
1446 RETURN(ptlrpc_reply(req));
1449 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
1450 struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1455 LDLM_DEBUG(lock, "client blocking AST callback handler");
1457 lock_res_and_lock(lock);
1458 lock->l_flags |= LDLM_FL_CBPENDING;
1460 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
1461 lock->l_flags |= LDLM_FL_CANCEL;
1463 do_ast = (!lock->l_readers && !lock->l_writers);
1464 unlock_res_and_lock(lock);
1467 CDEBUG(D_DLMTRACE, "Lock %p already unused, calling callback (%p)\n",
1468 lock, lock->l_blocking_ast);
1469 if (lock->l_blocking_ast != NULL)
1470 lock->l_blocking_ast(lock, ld, lock->l_ast_data,
1473 CDEBUG(D_DLMTRACE, "Lock %p is referenced, will be cancelled later\n",
1477 LDLM_DEBUG(lock, "client blocking callback handler END");
1478 LDLM_LOCK_RELEASE(lock);
1482 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
1483 struct ldlm_namespace *ns,
1484 struct ldlm_request *dlm_req,
1485 struct ldlm_lock *lock)
1487 CFS_LIST_HEAD(ast_list);
1490 LDLM_DEBUG(lock, "client completion callback handler START");
1492 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) {
1493 int to = cfs_time_seconds(1);
1495 cfs_schedule_timeout_and_set_state(
1496 CFS_TASK_INTERRUPTIBLE, to);
1497 if (lock->l_granted_mode == lock->l_req_mode ||
1503 lock_res_and_lock(lock);
1504 if (lock->l_destroyed ||
1505 lock->l_granted_mode == lock->l_req_mode) {
1506 /* bug 11300: the lock has already been granted */
1507 unlock_res_and_lock(lock);
1508 LDLM_DEBUG(lock, "Double grant race happened");
1509 LDLM_LOCK_RELEASE(lock);
1514 /* If we receive the completion AST before the actual enqueue returned,
1515 * then we might need to switch lock modes, resources, or extents. */
1516 if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
1517 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
1518 LDLM_DEBUG(lock, "completion AST, new lock mode");
1521 if (lock->l_resource->lr_type != LDLM_PLAIN) {
1522 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1523 LDLM_DEBUG(lock, "completion AST, new policy data");
1526 ldlm_resource_unlink_lock(lock);
1527 if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
1528 &lock->l_resource->lr_name,
1529 sizeof(lock->l_resource->lr_name)) != 0) {
1530 unlock_res_and_lock(lock);
1531 if (ldlm_lock_change_resource(ns, lock,
1532 &dlm_req->lock_desc.l_resource.lr_name) != 0) {
1533 LDLM_ERROR(lock, "Failed to allocate resource");
1534 LDLM_LOCK_RELEASE(lock);
1538 LDLM_DEBUG(lock, "completion AST, new resource");
1539 CERROR("change resource!\n");
1540 lock_res_and_lock(lock);
1543 if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
1544 /* BL_AST locks are not needed in lru.
1545 * let ldlm_cancel_lru() be fast. */
1546 ldlm_lock_remove_from_lru(lock);
1547 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
1548 LDLM_DEBUG(lock, "completion AST includes blocking AST");
1551 if (lock->l_lvb_len) {
1552 if (req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB,
1553 RCL_CLIENT) < lock->l_lvb_len) {
1554 LDLM_ERROR(lock, "completion AST did not contain "
1557 void *lvb = req_capsule_client_get(&req->rq_pill,
1559 memcpy(lock->l_lvb_data, lvb, lock->l_lvb_len);
1563 ldlm_grant_lock(lock, &ast_list);
1564 unlock_res_and_lock(lock);
1566 LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
1568 /* Let Enqueue to call osc_lock_upcall() and initialize
1570 OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 2);
1572 ldlm_run_ast_work(&ast_list, LDLM_WORK_CP_AST);
1574 LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
1576 LDLM_LOCK_RELEASE(lock);
1580 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
1581 struct ldlm_namespace *ns,
1582 struct ldlm_request *dlm_req,
1583 struct ldlm_lock *lock)
1588 LDLM_DEBUG(lock, "client glimpse AST callback handler");
1590 if (lock->l_glimpse_ast != NULL)
1591 rc = lock->l_glimpse_ast(lock, req);
1593 if (req->rq_repmsg != NULL) {
1596 req->rq_status = rc;
1600 lock_res_and_lock(lock);
1601 if (lock->l_granted_mode == LCK_PW &&
1602 !lock->l_readers && !lock->l_writers &&
1603 cfs_time_after(cfs_time_current(),
1604 cfs_time_add(lock->l_last_used,
1605 cfs_time_seconds(10)))) {
1606 unlock_res_and_lock(lock);
1607 if (ldlm_bl_to_thread_lock(ns, NULL, lock))
1608 ldlm_handle_bl_callback(ns, NULL, lock);
1613 unlock_res_and_lock(lock);
1614 LDLM_LOCK_RELEASE(lock);
1618 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1620 if (req->rq_no_reply)
1623 req->rq_status = rc;
1624 if (!req->rq_packed_final) {
1625 rc = lustre_pack_reply(req, 1, NULL, NULL);
1629 return ptlrpc_reply(req);
1633 static int __ldlm_bl_to_thread(struct ldlm_bl_work_item *blwi, int mode)
1635 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1638 cfs_spin_lock(&blp->blp_lock);
1639 if (blwi->blwi_lock && blwi->blwi_lock->l_flags & LDLM_FL_DISCARD_DATA) {
1640 /* add LDLM_FL_DISCARD_DATA requests to the priority list */
1641 cfs_list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
1643 /* other blocking callbacks are added to the regular list */
1644 cfs_list_add_tail(&blwi->blwi_entry, &blp->blp_list);
1646 cfs_spin_unlock(&blp->blp_lock);
1648 cfs_waitq_signal(&blp->blp_waitq);
1650 /* can not use blwi->blwi_mode as blwi could be already freed in
1652 if (mode == LDLM_SYNC)
1653 cfs_wait_for_completion(&blwi->blwi_comp);
1658 static inline void init_blwi(struct ldlm_bl_work_item *blwi,
1659 struct ldlm_namespace *ns,
1660 struct ldlm_lock_desc *ld,
1661 cfs_list_t *cancels, int count,
1662 struct ldlm_lock *lock,
1665 cfs_init_completion(&blwi->blwi_comp);
1666 CFS_INIT_LIST_HEAD(&blwi->blwi_head);
1668 if (cfs_memory_pressure_get())
1669 blwi->blwi_mem_pressure = 1;
1672 blwi->blwi_mode = mode;
1674 blwi->blwi_ld = *ld;
1676 cfs_list_add(&blwi->blwi_head, cancels);
1677 cfs_list_del_init(cancels);
1678 blwi->blwi_count = count;
1680 blwi->blwi_lock = lock;
1684 static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
1685 struct ldlm_lock_desc *ld, struct ldlm_lock *lock,
1686 cfs_list_t *cancels, int count, int mode)
1690 if (cancels && count == 0)
1693 if (mode == LDLM_SYNC) {
1694 /* if it is synchronous call do minimum mem alloc, as it could
1695 * be triggered from kernel shrinker
1697 struct ldlm_bl_work_item blwi;
1698 memset(&blwi, 0, sizeof(blwi));
1699 init_blwi(&blwi, ns, ld, cancels, count, lock, LDLM_SYNC);
1700 RETURN(__ldlm_bl_to_thread(&blwi, LDLM_SYNC));
1702 struct ldlm_bl_work_item *blwi;
1703 OBD_ALLOC(blwi, sizeof(*blwi));
1706 init_blwi(blwi, ns, ld, cancels, count, lock, LDLM_ASYNC);
1708 RETURN(__ldlm_bl_to_thread(blwi, LDLM_ASYNC));
1714 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1715 struct ldlm_lock *lock)
1718 RETURN(ldlm_bl_to_thread(ns, ld, lock, NULL, 0, LDLM_ASYNC));
1724 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1725 cfs_list_t *cancels, int count, int mode)
1728 RETURN(ldlm_bl_to_thread(ns, ld, NULL, cancels, count, mode));
1734 /* Setinfo coming from Server (eg MDT) to Client (eg MDC)! */
1735 static int ldlm_handle_setinfo(struct ptlrpc_request *req)
1737 struct obd_device *obd = req->rq_export->exp_obd;
1744 DEBUG_REQ(D_HSM, req, "%s: handle setinfo\n", obd->obd_name);
1746 req_capsule_set(&req->rq_pill, &RQF_OBD_SET_INFO);
1748 key = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
1750 DEBUG_REQ(D_IOCTL, req, "no set_info key");
1753 keylen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_KEY,
1755 val = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
1757 DEBUG_REQ(D_IOCTL, req, "no set_info val");
1760 vallen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_VAL,
1763 /* We are responsible for swabbing contents of val */
1765 if (KEY_IS(KEY_HSM_COPYTOOL_SEND))
1766 /* Pass it on to mdc (the "export" in this case) */
1767 rc = obd_set_info_async(req->rq_export,
1768 sizeof(KEY_HSM_COPYTOOL_SEND),
1769 KEY_HSM_COPYTOOL_SEND,
1772 DEBUG_REQ(D_WARNING, req, "ignoring unknown key %s", key);
1777 static inline void ldlm_callback_errmsg(struct ptlrpc_request *req,
1778 const char *msg, int rc,
1779 struct lustre_handle *handle)
1781 DEBUG_REQ((req->rq_no_reply || rc) ? D_WARNING : D_DLMTRACE, req,
1782 "%s: [nid %s] [rc %d] [lock "LPX64"]",
1783 msg, libcfs_id2str(req->rq_peer), rc,
1784 handle ? handle->cookie : 0);
1785 if (req->rq_no_reply)
1786 CWARN("No reply was sent, maybe cause bug 21636.\n");
1788 CWARN("Send reply failed, maybe cause bug 21636.\n");
1791 /* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */
1792 static int ldlm_callback_handler(struct ptlrpc_request *req)
1794 struct ldlm_namespace *ns;
1795 struct ldlm_request *dlm_req;
1796 struct ldlm_lock *lock;
1800 /* Requests arrive in sender's byte order. The ptlrpc service
1801 * handler has already checked and, if necessary, byte-swapped the
1802 * incoming request message body, but I am responsible for the
1803 * message buffers. */
1805 /* do nothing for sec context finalize */
1806 if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI)
1809 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
1811 if (req->rq_export == NULL) {
1812 rc = ldlm_callback_reply(req, -ENOTCONN);
1813 ldlm_callback_errmsg(req, "Operate on unconnected server",
1818 LASSERT(req->rq_export != NULL);
1819 LASSERT(req->rq_export->exp_obd != NULL);
1821 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1822 case LDLM_BL_CALLBACK:
1823 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK))
1826 case LDLM_CP_CALLBACK:
1827 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK))
1830 case LDLM_GL_CALLBACK:
1831 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK))
1835 rc = ldlm_handle_setinfo(req);
1836 ldlm_callback_reply(req, rc);
1838 case OBD_LOG_CANCEL: /* remove this eventually - for 1.4.0 compat */
1839 CERROR("shouldn't be handling OBD_LOG_CANCEL on DLM thread\n");
1840 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
1841 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
1843 rc = llog_origin_handle_cancel(req);
1844 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_REP))
1846 ldlm_callback_reply(req, rc);
1848 case OBD_QC_CALLBACK:
1849 req_capsule_set(&req->rq_pill, &RQF_QC_CALLBACK);
1850 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_QC_CALLBACK_NET))
1852 rc = target_handle_qc_callback(req);
1853 ldlm_callback_reply(req, rc);
1857 /* reply in handler */
1858 req_capsule_set(&req->rq_pill, &RQF_MDS_QUOTA_DQACQ);
1859 rc = target_handle_dqacq_callback(req);
1861 case LLOG_ORIGIN_HANDLE_CREATE:
1862 req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
1863 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1865 rc = llog_origin_handle_create(req);
1866 ldlm_callback_reply(req, rc);
1868 case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
1869 req_capsule_set(&req->rq_pill,
1870 &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
1871 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1873 rc = llog_origin_handle_next_block(req);
1874 ldlm_callback_reply(req, rc);
1876 case LLOG_ORIGIN_HANDLE_READ_HEADER:
1877 req_capsule_set(&req->rq_pill,
1878 &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER);
1879 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1881 rc = llog_origin_handle_read_header(req);
1882 ldlm_callback_reply(req, rc);
1884 case LLOG_ORIGIN_HANDLE_CLOSE:
1885 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1887 rc = llog_origin_handle_close(req);
1888 ldlm_callback_reply(req, rc);
1891 CERROR("unknown opcode %u\n",
1892 lustre_msg_get_opc(req->rq_reqmsg));
1893 ldlm_callback_reply(req, -EPROTO);
1897 ns = req->rq_export->exp_obd->obd_namespace;
1898 LASSERT(ns != NULL);
1900 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1902 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1903 if (dlm_req == NULL) {
1904 rc = ldlm_callback_reply(req, -EPROTO);
1905 ldlm_callback_errmsg(req, "Operate without parameter", rc,
1910 /* Force a known safe race, send a cancel to the server for a lock
1911 * which the server has already started a blocking callback on. */
1912 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE) &&
1913 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1914 rc = ldlm_cli_cancel(&dlm_req->lock_handle[0]);
1916 CERROR("ldlm_cli_cancel: %d\n", rc);
1919 lock = ldlm_handle2lock_long(&dlm_req->lock_handle[0], 0);
1921 CDEBUG(D_DLMTRACE, "callback on lock "LPX64" - lock "
1922 "disappeared\n", dlm_req->lock_handle[0].cookie);
1923 rc = ldlm_callback_reply(req, -EINVAL);
1924 ldlm_callback_errmsg(req, "Operate with invalid parameter", rc,
1925 &dlm_req->lock_handle[0]);
1929 if ((lock->l_flags & LDLM_FL_FAIL_LOC) &&
1930 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK)
1931 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
1933 /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
1934 lock_res_and_lock(lock);
1935 lock->l_flags |= (dlm_req->lock_flags & LDLM_AST_FLAGS);
1936 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1937 /* If somebody cancels lock and cache is already dropped,
1938 * or lock is failed before cp_ast received on client,
1939 * we can tell the server we have no lock. Otherwise, we
1940 * should send cancel after dropping the cache. */
1941 if (((lock->l_flags & LDLM_FL_CANCELING) &&
1942 (lock->l_flags & LDLM_FL_BL_DONE)) ||
1943 (lock->l_flags & LDLM_FL_FAILED)) {
1944 LDLM_DEBUG(lock, "callback on lock "
1945 LPX64" - lock disappeared\n",
1946 dlm_req->lock_handle[0].cookie);
1947 unlock_res_and_lock(lock);
1948 LDLM_LOCK_RELEASE(lock);
1949 rc = ldlm_callback_reply(req, -EINVAL);
1950 ldlm_callback_errmsg(req, "Operate on stale lock", rc,
1951 &dlm_req->lock_handle[0]);
1954 /* BL_AST locks are not needed in lru.
1955 * let ldlm_cancel_lru() be fast. */
1956 ldlm_lock_remove_from_lru(lock);
1957 lock->l_flags |= LDLM_FL_BL_AST;
1959 unlock_res_and_lock(lock);
1961 /* We want the ost thread to get this reply so that it can respond
1962 * to ost requests (write cache writeback) that might be triggered
1965 * But we'd also like to be able to indicate in the reply that we're
1966 * cancelling right now, because it's unused, or have an intent result
1967 * in the reply, so we might have to push the responsibility for sending
1968 * the reply down into the AST handlers, alas. */
1970 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1971 case LDLM_BL_CALLBACK:
1972 CDEBUG(D_INODE, "blocking ast\n");
1973 req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
1974 if (!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)) {
1975 rc = ldlm_callback_reply(req, 0);
1976 if (req->rq_no_reply || rc)
1977 ldlm_callback_errmsg(req, "Normal process", rc,
1978 &dlm_req->lock_handle[0]);
1980 if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
1981 ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
1983 case LDLM_CP_CALLBACK:
1984 CDEBUG(D_INODE, "completion ast\n");
1985 req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
1986 ldlm_callback_reply(req, 0);
1987 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
1989 case LDLM_GL_CALLBACK:
1990 CDEBUG(D_INODE, "glimpse ast\n");
1991 req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
1992 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
1995 LBUG(); /* checked above */
2001 static int ldlm_cancel_handler(struct ptlrpc_request *req)
2006 /* Requests arrive in sender's byte order. The ptlrpc service
2007 * handler has already checked and, if necessary, byte-swapped the
2008 * incoming request message body, but I am responsible for the
2009 * message buffers. */
2011 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2013 if (req->rq_export == NULL) {
2014 struct ldlm_request *dlm_req;
2016 CERROR("%s from %s arrived at %lu with bad export cookie "
2018 ll_opcode2str(lustre_msg_get_opc(req->rq_reqmsg)),
2019 libcfs_nid2str(req->rq_peer.nid),
2020 req->rq_arrival_time.tv_sec,
2021 lustre_msg_get_handle(req->rq_reqmsg)->cookie);
2023 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_CANCEL) {
2024 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2025 dlm_req = req_capsule_client_get(&req->rq_pill,
2027 if (dlm_req != NULL)
2028 ldlm_lock_dump_handle(D_ERROR,
2029 &dlm_req->lock_handle[0]);
2031 ldlm_callback_reply(req, -ENOTCONN);
2035 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2037 /* XXX FIXME move this back to mds/handler.c, bug 249 */
2039 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
2040 CDEBUG(D_INODE, "cancel\n");
2041 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL))
2043 rc = ldlm_handle_cancel(req);
2047 case OBD_LOG_CANCEL:
2048 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
2049 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
2051 rc = llog_origin_handle_cancel(req);
2052 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_REP))
2054 ldlm_callback_reply(req, rc);
2057 CERROR("invalid opcode %d\n",
2058 lustre_msg_get_opc(req->rq_reqmsg));
2059 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2060 ldlm_callback_reply(req, -EINVAL);
2066 int ldlm_revoke_lock_cb(cfs_hash_t *hs, cfs_hash_bd_t *bd,
2067 cfs_hlist_node_t *hnode, void *data)
2070 cfs_list_t *rpc_list = data;
2071 struct ldlm_lock *lock = cfs_hash_object(hs, hnode);
2073 lock_res_and_lock(lock);
2075 if (lock->l_req_mode != lock->l_granted_mode) {
2076 unlock_res_and_lock(lock);
2080 LASSERT(lock->l_resource);
2081 if (lock->l_resource->lr_type != LDLM_IBITS &&
2082 lock->l_resource->lr_type != LDLM_PLAIN) {
2083 unlock_res_and_lock(lock);
2087 if (lock->l_flags & LDLM_FL_AST_SENT) {
2088 unlock_res_and_lock(lock);
2092 LASSERT(lock->l_blocking_ast);
2093 LASSERT(!lock->l_blocking_lock);
2095 lock->l_flags |= LDLM_FL_AST_SENT;
2096 if (lock->l_export && lock->l_export->exp_lock_hash &&
2097 !cfs_hlist_unhashed(&lock->l_exp_hash))
2098 cfs_hash_del(lock->l_export->exp_lock_hash,
2099 &lock->l_remote_handle, &lock->l_exp_hash);
2100 cfs_list_add_tail(&lock->l_rk_ast, rpc_list);
2101 LDLM_LOCK_GET(lock);
2103 unlock_res_and_lock(lock);
2107 void ldlm_revoke_export_locks(struct obd_export *exp)
2109 cfs_list_t rpc_list;
2112 CFS_INIT_LIST_HEAD(&rpc_list);
2113 cfs_hash_for_each_empty(exp->exp_lock_hash,
2114 ldlm_revoke_lock_cb, &rpc_list);
2115 ldlm_run_ast_work(&rpc_list, LDLM_WORK_REVOKE_AST);
2121 static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp)
2123 struct ldlm_bl_work_item *blwi = NULL;
2124 static unsigned int num_bl = 0;
2126 cfs_spin_lock(&blp->blp_lock);
2127 /* process a request from the blp_list at least every blp_num_threads */
2128 if (!cfs_list_empty(&blp->blp_list) &&
2129 (cfs_list_empty(&blp->blp_prio_list) || num_bl == 0))
2130 blwi = cfs_list_entry(blp->blp_list.next,
2131 struct ldlm_bl_work_item, blwi_entry);
2133 if (!cfs_list_empty(&blp->blp_prio_list))
2134 blwi = cfs_list_entry(blp->blp_prio_list.next,
2135 struct ldlm_bl_work_item,
2139 if (++num_bl >= cfs_atomic_read(&blp->blp_num_threads))
2141 cfs_list_del(&blwi->blwi_entry);
2143 cfs_spin_unlock(&blp->blp_lock);
2148 /* This only contains temporary data until the thread starts */
2149 struct ldlm_bl_thread_data {
2150 char bltd_name[CFS_CURPROC_COMM_MAX];
2151 struct ldlm_bl_pool *bltd_blp;
2152 cfs_completion_t bltd_comp;
2156 static int ldlm_bl_thread_main(void *arg);
2158 static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp)
2160 struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
2163 cfs_init_completion(&bltd.bltd_comp);
2164 rc = cfs_kernel_thread(ldlm_bl_thread_main, &bltd, 0);
2166 CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %d\n",
2167 cfs_atomic_read(&blp->blp_num_threads), rc);
2170 cfs_wait_for_completion(&bltd.bltd_comp);
2175 static int ldlm_bl_thread_main(void *arg)
2177 struct ldlm_bl_pool *blp;
2181 struct ldlm_bl_thread_data *bltd = arg;
2183 blp = bltd->bltd_blp;
2186 cfs_atomic_inc_return(&blp->blp_num_threads) - 1;
2187 cfs_atomic_inc(&blp->blp_busy_threads);
2189 snprintf(bltd->bltd_name, sizeof(bltd->bltd_name) - 1,
2190 "ldlm_bl_%02d", bltd->bltd_num);
2191 cfs_daemonize(bltd->bltd_name);
2193 cfs_complete(&bltd->bltd_comp);
2194 /* cannot use bltd after this, it is only on caller's stack */
2198 struct l_wait_info lwi = { 0 };
2199 struct ldlm_bl_work_item *blwi = NULL;
2201 blwi = ldlm_bl_get_work(blp);
2206 cfs_atomic_dec(&blp->blp_busy_threads);
2207 l_wait_event_exclusive(blp->blp_waitq,
2208 (blwi = ldlm_bl_get_work(blp)) != NULL,
2210 busy = cfs_atomic_inc_return(&blp->blp_busy_threads);
2212 if (blwi->blwi_ns == NULL)
2213 /* added by ldlm_cleanup() */
2216 /* Not fatal if racy and have a few too many threads */
2217 if (unlikely(busy < blp->blp_max_threads &&
2218 busy >= cfs_atomic_read(&blp->blp_num_threads)))
2219 /* discard the return value, we tried */
2220 ldlm_bl_thread_start(blp);
2222 if (blwi->blwi_ns == NULL)
2223 /* added by ldlm_cleanup() */
2226 if (blwi->blwi_mem_pressure)
2227 cfs_memory_pressure_set();
2229 if (blwi->blwi_count) {
2231 /* The special case when we cancel locks in lru
2232 * asynchronously, we pass the list of locks here.
2233 * Thus locks are marked LDLM_FL_CANCELING, but NOT
2234 * canceled locally yet. */
2235 count = ldlm_cli_cancel_list_local(&blwi->blwi_head,
2238 ldlm_cli_cancel_list(&blwi->blwi_head, count, NULL, 0);
2240 ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
2243 if (blwi->blwi_mem_pressure)
2244 cfs_memory_pressure_clr();
2246 if (blwi->blwi_mode == LDLM_ASYNC)
2247 OBD_FREE(blwi, sizeof(*blwi));
2249 cfs_complete(&blwi->blwi_comp);
2252 cfs_atomic_dec(&blp->blp_busy_threads);
2253 cfs_atomic_dec(&blp->blp_num_threads);
2254 cfs_complete(&blp->blp_comp);
2260 static int ldlm_setup(void);
2261 static int ldlm_cleanup(void);
2263 int ldlm_get_ref(void)
2267 cfs_mutex_down(&ldlm_ref_sem);
2268 if (++ldlm_refcount == 1) {
2273 cfs_mutex_up(&ldlm_ref_sem);
2278 void ldlm_put_ref(void)
2281 cfs_mutex_down(&ldlm_ref_sem);
2282 if (ldlm_refcount == 1) {
2283 int rc = ldlm_cleanup();
2285 CERROR("ldlm_cleanup failed: %d\n", rc);
2291 cfs_mutex_up(&ldlm_ref_sem);
2297 * Export handle<->lock hash operations.
2300 ldlm_export_lock_hash(cfs_hash_t *hs, void *key, unsigned mask)
2302 return cfs_hash_u64_hash(((struct lustre_handle *)key)->cookie, mask);
2306 ldlm_export_lock_key(cfs_hlist_node_t *hnode)
2308 struct ldlm_lock *lock;
2310 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2311 return &lock->l_remote_handle;
2315 ldlm_export_lock_keycpy(cfs_hlist_node_t *hnode, void *key)
2317 struct ldlm_lock *lock;
2319 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2320 lock->l_remote_handle = *(struct lustre_handle *)key;
2324 ldlm_export_lock_keycmp(void *key, cfs_hlist_node_t *hnode)
2326 return lustre_handle_equal(ldlm_export_lock_key(hnode), key);
2330 ldlm_export_lock_object(cfs_hlist_node_t *hnode)
2332 return cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2336 ldlm_export_lock_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
2338 struct ldlm_lock *lock;
2340 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2341 LDLM_LOCK_GET(lock);
2345 ldlm_export_lock_put(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
2347 struct ldlm_lock *lock;
2349 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2350 LDLM_LOCK_RELEASE(lock);
2353 static cfs_hash_ops_t ldlm_export_lock_ops = {
2354 .hs_hash = ldlm_export_lock_hash,
2355 .hs_key = ldlm_export_lock_key,
2356 .hs_keycmp = ldlm_export_lock_keycmp,
2357 .hs_keycpy = ldlm_export_lock_keycpy,
2358 .hs_object = ldlm_export_lock_object,
2359 .hs_get = ldlm_export_lock_get,
2360 .hs_put = ldlm_export_lock_put,
2361 .hs_put_locked = ldlm_export_lock_put,
2364 int ldlm_init_export(struct obd_export *exp)
2368 exp->exp_lock_hash =
2369 cfs_hash_create(obd_uuid2str(&exp->exp_client_uuid),
2370 HASH_EXP_LOCK_CUR_BITS,
2371 HASH_EXP_LOCK_MAX_BITS,
2372 HASH_EXP_LOCK_BKT_BITS, 0,
2373 CFS_HASH_MIN_THETA, CFS_HASH_MAX_THETA,
2374 &ldlm_export_lock_ops,
2375 CFS_HASH_DEFAULT | CFS_HASH_REHASH_KEY |
2376 CFS_HASH_NBLK_CHANGE);
2378 if (!exp->exp_lock_hash)
2383 EXPORT_SYMBOL(ldlm_init_export);
2385 void ldlm_destroy_export(struct obd_export *exp)
2388 cfs_hash_putref(exp->exp_lock_hash);
2389 exp->exp_lock_hash = NULL;
2392 EXPORT_SYMBOL(ldlm_destroy_export);
2394 static int ldlm_setup(void)
2396 struct ldlm_bl_pool *blp;
2398 int ldlm_min_threads = LDLM_THREADS_AUTO_MIN;
2399 int ldlm_max_threads = LDLM_THREADS_AUTO_MAX;
2405 if (ldlm_state != NULL)
2408 OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
2409 if (ldlm_state == NULL)
2413 rc = ldlm_proc_setup();
2419 if (ldlm_num_threads) {
2420 /* If ldlm_num_threads is set, it is the min and the max. */
2421 if (ldlm_num_threads > LDLM_THREADS_AUTO_MAX)
2422 ldlm_num_threads = LDLM_THREADS_AUTO_MAX;
2423 if (ldlm_num_threads < LDLM_THREADS_AUTO_MIN)
2424 ldlm_num_threads = LDLM_THREADS_AUTO_MIN;
2425 ldlm_min_threads = ldlm_max_threads = ldlm_num_threads;
2429 ldlm_state->ldlm_cb_service =
2430 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2431 LDLM_MAXREPSIZE, LDLM_CB_REQUEST_PORTAL,
2432 LDLM_CB_REPLY_PORTAL, 2,
2433 ldlm_callback_handler, "ldlm_cbd",
2434 ldlm_svc_proc_dir, NULL,
2435 ldlm_min_threads, ldlm_max_threads,
2437 LCT_MD_THREAD|LCT_DT_THREAD, NULL);
2439 if (!ldlm_state->ldlm_cb_service) {
2440 CERROR("failed to start service\n");
2441 GOTO(out_proc, rc = -ENOMEM);
2444 ldlm_state->ldlm_cancel_service =
2445 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2446 LDLM_MAXREPSIZE, LDLM_CANCEL_REQUEST_PORTAL,
2447 LDLM_CANCEL_REPLY_PORTAL, 6,
2448 ldlm_cancel_handler, "ldlm_canceld",
2449 ldlm_svc_proc_dir, NULL,
2450 ldlm_min_threads, ldlm_max_threads,
2452 LCT_MD_THREAD|LCT_DT_THREAD|LCT_CL_THREAD,
2455 if (!ldlm_state->ldlm_cancel_service) {
2456 CERROR("failed to start service\n");
2457 GOTO(out_proc, rc = -ENOMEM);
2460 OBD_ALLOC(blp, sizeof(*blp));
2462 GOTO(out_proc, rc = -ENOMEM);
2463 ldlm_state->ldlm_bl_pool = blp;
2465 cfs_spin_lock_init(&blp->blp_lock);
2466 CFS_INIT_LIST_HEAD(&blp->blp_list);
2467 CFS_INIT_LIST_HEAD(&blp->blp_prio_list);
2468 cfs_waitq_init(&blp->blp_waitq);
2469 cfs_atomic_set(&blp->blp_num_threads, 0);
2470 cfs_atomic_set(&blp->blp_busy_threads, 0);
2471 blp->blp_min_threads = ldlm_min_threads;
2472 blp->blp_max_threads = ldlm_max_threads;
2475 for (i = 0; i < blp->blp_min_threads; i++) {
2476 rc = ldlm_bl_thread_start(blp);
2478 GOTO(out_thread, rc);
2481 rc = ptlrpc_start_threads(ldlm_state->ldlm_cancel_service);
2483 GOTO(out_thread, rc);
2485 rc = ptlrpc_start_threads(ldlm_state->ldlm_cb_service);
2487 GOTO(out_thread, rc);
2489 CFS_INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
2490 expired_lock_thread.elt_state = ELT_STOPPED;
2491 cfs_waitq_init(&expired_lock_thread.elt_waitq);
2493 CFS_INIT_LIST_HEAD(&waiting_locks_list);
2494 cfs_spin_lock_init(&waiting_locks_spinlock);
2495 cfs_timer_init(&waiting_locks_timer, waiting_locks_callback, 0);
2497 rc = cfs_kernel_thread(expired_lock_main, NULL, CLONE_VM | CLONE_FILES);
2499 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
2500 GOTO(out_thread, rc);
2503 cfs_wait_event(expired_lock_thread.elt_waitq,
2504 expired_lock_thread.elt_state == ELT_READY);
2508 rc = ldlm_pools_init();
2510 GOTO(out_thread, rc);
2516 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2517 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2522 ldlm_proc_cleanup();
2525 OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2530 static int ldlm_cleanup(void)
2533 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
2537 if (!cfs_list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) ||
2538 !cfs_list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) {
2539 CERROR("ldlm still has namespaces; clean these up first.\n");
2540 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
2541 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
2550 while (cfs_atomic_read(&blp->blp_num_threads) > 0) {
2551 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
2553 cfs_init_completion(&blp->blp_comp);
2555 cfs_spin_lock(&blp->blp_lock);
2556 cfs_list_add_tail(&blwi.blwi_entry, &blp->blp_list);
2557 cfs_waitq_signal(&blp->blp_waitq);
2558 cfs_spin_unlock(&blp->blp_lock);
2560 cfs_wait_for_completion(&blp->blp_comp);
2562 OBD_FREE(blp, sizeof(*blp));
2564 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2565 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2566 ldlm_proc_cleanup();
2568 expired_lock_thread.elt_state = ELT_TERMINATE;
2569 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
2570 cfs_wait_event(expired_lock_thread.elt_waitq,
2571 expired_lock_thread.elt_state == ELT_STOPPED);
2573 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2574 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2577 OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2583 int __init ldlm_init(void)
2585 cfs_init_mutex(&ldlm_ref_sem);
2586 cfs_init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER));
2587 cfs_init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
2588 ldlm_resource_slab = cfs_mem_cache_create("ldlm_resources",
2589 sizeof(struct ldlm_resource), 0,
2590 CFS_SLAB_HWCACHE_ALIGN);
2591 if (ldlm_resource_slab == NULL)
2594 ldlm_lock_slab = cfs_mem_cache_create("ldlm_locks",
2595 sizeof(struct ldlm_lock), 0,
2596 CFS_SLAB_HWCACHE_ALIGN | CFS_SLAB_DESTROY_BY_RCU);
2597 if (ldlm_lock_slab == NULL) {
2598 cfs_mem_cache_destroy(ldlm_resource_slab);
2602 ldlm_interval_slab = cfs_mem_cache_create("interval_node",
2603 sizeof(struct ldlm_interval),
2604 0, CFS_SLAB_HWCACHE_ALIGN);
2605 if (ldlm_interval_slab == NULL) {
2606 cfs_mem_cache_destroy(ldlm_resource_slab);
2607 cfs_mem_cache_destroy(ldlm_lock_slab);
2610 #if LUSTRE_TRACKS_LOCK_EXP_REFS
2611 class_export_dump_hook = ldlm_dump_export_locks;
2616 void __exit ldlm_exit(void)
2620 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
2621 rc = cfs_mem_cache_destroy(ldlm_resource_slab);
2622 LASSERTF(rc == 0, "couldn't free ldlm resource slab\n");
2624 /* ldlm_lock_put() use RCU to call ldlm_lock_free, so need call
2625 * synchronize_rcu() to wait a grace period elapsed, so that
2626 * ldlm_lock_free() get a chance to be called. */
2629 rc = cfs_mem_cache_destroy(ldlm_lock_slab);
2630 LASSERTF(rc == 0, "couldn't free ldlm lock slab\n");
2631 rc = cfs_mem_cache_destroy(ldlm_interval_slab);
2632 LASSERTF(rc == 0, "couldn't free interval node slab\n");
2636 EXPORT_SYMBOL(ldlm_extent_shift_kms);
2639 EXPORT_SYMBOL(ldlm_get_processing_policy);
2640 EXPORT_SYMBOL(ldlm_lock2desc);
2641 EXPORT_SYMBOL(ldlm_register_intent);
2642 EXPORT_SYMBOL(ldlm_lockname);
2643 EXPORT_SYMBOL(ldlm_typename);
2644 EXPORT_SYMBOL(ldlm_lock2handle);
2645 EXPORT_SYMBOL(__ldlm_handle2lock);
2646 EXPORT_SYMBOL(ldlm_lock_get);
2647 EXPORT_SYMBOL(ldlm_lock_put);
2648 EXPORT_SYMBOL(ldlm_lock_match);
2649 EXPORT_SYMBOL(ldlm_lock_cancel);
2650 EXPORT_SYMBOL(ldlm_lock_addref);
2651 EXPORT_SYMBOL(ldlm_lock_addref_try);
2652 EXPORT_SYMBOL(ldlm_lock_decref);
2653 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
2654 EXPORT_SYMBOL(ldlm_lock_change_resource);
2655 EXPORT_SYMBOL(ldlm_it2str);
2656 EXPORT_SYMBOL(ldlm_lock_dump);
2657 EXPORT_SYMBOL(ldlm_lock_dump_handle);
2658 EXPORT_SYMBOL(ldlm_reprocess_all_ns);
2659 EXPORT_SYMBOL(ldlm_lock_allow_match_locked);
2660 EXPORT_SYMBOL(ldlm_lock_allow_match);
2661 EXPORT_SYMBOL(ldlm_lock_downgrade);
2662 EXPORT_SYMBOL(ldlm_lock_convert);
2664 /* ldlm_request.c */
2665 EXPORT_SYMBOL(ldlm_completion_ast_async);
2666 EXPORT_SYMBOL(ldlm_blocking_ast_nocheck);
2667 EXPORT_SYMBOL(ldlm_completion_ast);
2668 EXPORT_SYMBOL(ldlm_blocking_ast);
2669 EXPORT_SYMBOL(ldlm_glimpse_ast);
2670 EXPORT_SYMBOL(ldlm_expired_completion_wait);
2671 EXPORT_SYMBOL(ldlm_prep_enqueue_req);
2672 EXPORT_SYMBOL(ldlm_prep_elc_req);
2673 EXPORT_SYMBOL(ldlm_cli_convert);
2674 EXPORT_SYMBOL(ldlm_cli_enqueue);
2675 EXPORT_SYMBOL(ldlm_cli_enqueue_fini);
2676 EXPORT_SYMBOL(ldlm_cli_enqueue_local);
2677 EXPORT_SYMBOL(ldlm_cli_cancel);
2678 EXPORT_SYMBOL(ldlm_cli_cancel_unused);
2679 EXPORT_SYMBOL(ldlm_cli_cancel_unused_resource);
2680 EXPORT_SYMBOL(ldlm_cli_cancel_req);
2681 EXPORT_SYMBOL(ldlm_replay_locks);
2682 EXPORT_SYMBOL(ldlm_resource_foreach);
2683 EXPORT_SYMBOL(ldlm_namespace_foreach);
2684 EXPORT_SYMBOL(ldlm_resource_iterate);
2685 EXPORT_SYMBOL(ldlm_cancel_resource_local);
2686 EXPORT_SYMBOL(ldlm_cli_cancel_list_local);
2687 EXPORT_SYMBOL(ldlm_cli_cancel_list);
2690 EXPORT_SYMBOL(ldlm_server_blocking_ast);
2691 EXPORT_SYMBOL(ldlm_server_completion_ast);
2692 EXPORT_SYMBOL(ldlm_server_glimpse_ast);
2693 EXPORT_SYMBOL(ldlm_handle_enqueue);
2694 EXPORT_SYMBOL(ldlm_handle_enqueue0);
2695 EXPORT_SYMBOL(ldlm_handle_cancel);
2696 EXPORT_SYMBOL(ldlm_request_cancel);
2697 EXPORT_SYMBOL(ldlm_handle_convert);
2698 EXPORT_SYMBOL(ldlm_handle_convert0);
2699 EXPORT_SYMBOL(ldlm_del_waiting_lock);
2700 EXPORT_SYMBOL(ldlm_get_ref);
2701 EXPORT_SYMBOL(ldlm_put_ref);
2702 EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
2703 EXPORT_SYMBOL(ldlm_revoke_export_locks);
2705 /* ldlm_resource.c */
2706 EXPORT_SYMBOL(ldlm_namespace_new);
2707 EXPORT_SYMBOL(ldlm_namespace_cleanup);
2708 EXPORT_SYMBOL(ldlm_namespace_free);
2709 EXPORT_SYMBOL(ldlm_namespace_dump);
2710 EXPORT_SYMBOL(ldlm_dump_all_namespaces);
2711 EXPORT_SYMBOL(ldlm_resource_get);
2712 EXPORT_SYMBOL(ldlm_resource_putref);
2713 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
2716 EXPORT_SYMBOL(client_import_add_conn);
2717 EXPORT_SYMBOL(client_import_del_conn);
2718 EXPORT_SYMBOL(client_obd_setup);
2719 EXPORT_SYMBOL(client_obd_cleanup);
2720 EXPORT_SYMBOL(client_connect_import);
2721 EXPORT_SYMBOL(client_disconnect_export);
2722 EXPORT_SYMBOL(server_disconnect_export);
2723 EXPORT_SYMBOL(target_stop_recovery_thread);
2724 EXPORT_SYMBOL(target_handle_connect);
2725 EXPORT_SYMBOL(target_cleanup_recovery);
2726 EXPORT_SYMBOL(target_destroy_export);
2727 EXPORT_SYMBOL(target_cancel_recovery_timer);
2728 EXPORT_SYMBOL(target_send_reply);
2729 EXPORT_SYMBOL(target_queue_recovery_request);
2730 EXPORT_SYMBOL(target_handle_ping);
2731 EXPORT_SYMBOL(target_pack_pool_reply);
2732 EXPORT_SYMBOL(target_handle_disconnect);
2735 EXPORT_SYMBOL(lock_res_and_lock);
2736 EXPORT_SYMBOL(unlock_res_and_lock);