4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2010, 2013, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/ldlm/ldlm_lockd.c
38 * Author: Peter Braam <braam@clusterfs.com>
39 * Author: Phil Schwan <phil@clusterfs.com>
42 #define DEBUG_SUBSYSTEM S_LDLM
45 # include <libcfs/libcfs.h>
47 # include <liblustre.h>
50 #include <lustre_dlm.h>
51 #include <obd_class.h>
52 #include <libcfs/list.h>
53 #include "ldlm_internal.h"
55 static int ldlm_num_threads;
56 CFS_MODULE_PARM(ldlm_num_threads, "i", int, 0444,
57 "number of DLM service threads to start");
59 static char *ldlm_cpts;
60 CFS_MODULE_PARM(ldlm_cpts, "s", charp, 0444,
61 "CPU partitions ldlm threads should run on");
63 extern struct kmem_cache *ldlm_resource_slab;
64 extern struct kmem_cache *ldlm_lock_slab;
65 static struct mutex ldlm_ref_mutex;
66 static int ldlm_refcount;
68 struct ldlm_cb_async_args {
69 struct ldlm_cb_set_arg *ca_set_arg;
70 struct ldlm_lock *ca_lock;
75 static struct ldlm_state *ldlm_state;
77 inline cfs_time_t round_timeout(cfs_time_t timeout)
79 return cfs_time_seconds((int)cfs_duration_sec(cfs_time_sub(timeout, 0)) + 1);
82 /* timeout for initial callback (AST) reply (bz10399) */
83 static inline unsigned int ldlm_get_rq_timeout(void)
86 unsigned int timeout = min(ldlm_timeout, obd_timeout / 3);
88 return timeout < 1 ? 1 : timeout;
93 #define ELT_TERMINATE 2
99 * blp_prio_list is used for callbacks that should be handled
100 * as a priority. It is used for LDLM_FL_DISCARD_DATA requests.
103 cfs_list_t blp_prio_list;
106 * blp_list is used for all other callbacks which are likely
107 * to take longer to process.
111 wait_queue_head_t blp_waitq;
112 struct completion blp_comp;
113 atomic_t blp_num_threads;
114 atomic_t blp_busy_threads;
119 struct ldlm_bl_work_item {
120 cfs_list_t blwi_entry;
121 struct ldlm_namespace *blwi_ns;
122 struct ldlm_lock_desc blwi_ld;
123 struct ldlm_lock *blwi_lock;
124 cfs_list_t blwi_head;
126 struct completion blwi_comp;
127 ldlm_cancel_flags_t blwi_flags;
128 int blwi_mem_pressure;
131 #if defined(HAVE_SERVER_SUPPORT) && defined(__KERNEL__)
134 * Protects both waiting_locks_list and expired_lock_thread.
136 static spinlock_t waiting_locks_spinlock; /* BH lock (timer) */
139 * List for contended locks.
141 * As soon as a lock is contended, it gets placed on this list and
142 * expected time to get a response is filled in the lock. A special
143 * thread walks the list looking for locks that should be released and
144 * schedules client evictions for those that have not been released in
147 * All access to it should be under waiting_locks_spinlock.
149 static cfs_list_t waiting_locks_list;
150 static struct timer_list waiting_locks_timer;
152 static struct expired_lock_thread {
153 wait_queue_head_t elt_waitq;
156 cfs_list_t elt_expired_locks;
157 } expired_lock_thread;
159 static inline int have_expired_locks(void)
164 spin_lock_bh(&waiting_locks_spinlock);
165 need_to_run = !cfs_list_empty(&expired_lock_thread.elt_expired_locks);
166 spin_unlock_bh(&waiting_locks_spinlock);
172 * Check expired lock list for expired locks and time them out.
174 static int expired_lock_main(void *arg)
176 cfs_list_t *expired = &expired_lock_thread.elt_expired_locks;
177 struct l_wait_info lwi = { 0 };
182 expired_lock_thread.elt_state = ELT_READY;
183 wake_up(&expired_lock_thread.elt_waitq);
186 l_wait_event(expired_lock_thread.elt_waitq,
187 have_expired_locks() ||
188 expired_lock_thread.elt_state == ELT_TERMINATE,
191 spin_lock_bh(&waiting_locks_spinlock);
192 if (expired_lock_thread.elt_dump) {
193 struct libcfs_debug_msg_data msgdata = {
194 .msg_file = __FILE__,
195 .msg_fn = "waiting_locks_callback",
196 .msg_line = expired_lock_thread.elt_dump };
197 spin_unlock_bh(&waiting_locks_spinlock);
199 /* from waiting_locks_callback, but not in timer */
200 libcfs_debug_dumplog();
201 libcfs_run_lbug_upcall(&msgdata);
203 spin_lock_bh(&waiting_locks_spinlock);
204 expired_lock_thread.elt_dump = 0;
209 while (!cfs_list_empty(expired)) {
210 struct obd_export *export;
211 struct ldlm_lock *lock;
213 lock = cfs_list_entry(expired->next, struct ldlm_lock,
215 if ((void *)lock < LP_POISON + PAGE_CACHE_SIZE &&
216 (void *)lock >= LP_POISON) {
217 spin_unlock_bh(&waiting_locks_spinlock);
218 CERROR("free lock on elt list %p\n", lock);
221 cfs_list_del_init(&lock->l_pending_chain);
222 if ((void *)lock->l_export <
223 LP_POISON + PAGE_CACHE_SIZE &&
224 (void *)lock->l_export >= LP_POISON) {
225 CERROR("lock with free export on elt list %p\n",
227 lock->l_export = NULL;
228 LDLM_ERROR(lock, "free export");
229 /* release extra ref grabbed by
230 * ldlm_add_waiting_lock() or
231 * ldlm_failed_ast() */
232 LDLM_LOCK_RELEASE(lock);
236 if (ldlm_is_destroyed(lock)) {
237 /* release the lock refcount where
238 * waiting_locks_callback() founds */
239 LDLM_LOCK_RELEASE(lock);
242 export = class_export_lock_get(lock->l_export, lock);
243 spin_unlock_bh(&waiting_locks_spinlock);
246 class_fail_export(export);
247 class_export_lock_put(export, lock);
249 /* release extra ref grabbed by ldlm_add_waiting_lock()
250 * or ldlm_failed_ast() */
251 LDLM_LOCK_RELEASE(lock);
253 spin_lock_bh(&waiting_locks_spinlock);
255 spin_unlock_bh(&waiting_locks_spinlock);
257 if (do_dump && obd_dump_on_eviction) {
258 CERROR("dump the log upon eviction\n");
259 libcfs_debug_dumplog();
262 if (expired_lock_thread.elt_state == ELT_TERMINATE)
266 expired_lock_thread.elt_state = ELT_STOPPED;
267 wake_up(&expired_lock_thread.elt_waitq);
271 static int ldlm_add_waiting_lock(struct ldlm_lock *lock);
272 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, int seconds);
275 * Check if there is a request in the export request list
276 * which prevents the lock canceling.
278 static int ldlm_lock_busy(struct ldlm_lock *lock)
280 struct ptlrpc_request *req;
284 if (lock->l_export == NULL)
287 spin_lock_bh(&lock->l_export->exp_rpc_lock);
288 cfs_list_for_each_entry(req, &lock->l_export->exp_hp_rpcs,
290 if (req->rq_ops->hpreq_lock_match) {
291 match = req->rq_ops->hpreq_lock_match(req, lock);
296 spin_unlock_bh(&lock->l_export->exp_rpc_lock);
300 /* This is called from within a timer interrupt and cannot schedule */
301 static void waiting_locks_callback(unsigned long unused)
303 struct ldlm_lock *lock;
306 spin_lock_bh(&waiting_locks_spinlock);
307 while (!cfs_list_empty(&waiting_locks_list)) {
308 lock = cfs_list_entry(waiting_locks_list.next, struct ldlm_lock,
310 if (cfs_time_after(lock->l_callback_timeout,
311 cfs_time_current()) ||
312 (lock->l_req_mode == LCK_GROUP))
315 /* Check if we need to prolong timeout */
316 if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT) &&
317 ldlm_lock_busy(lock)) {
320 if (lock->l_pending_chain.next == &waiting_locks_list)
325 spin_unlock_bh(&waiting_locks_spinlock);
326 LDLM_DEBUG(lock, "prolong the busy lock");
327 ldlm_refresh_waiting_lock(lock,
328 ldlm_get_enq_timeout(lock));
329 spin_lock_bh(&waiting_locks_spinlock);
332 LDLM_LOCK_RELEASE(lock);
336 LDLM_LOCK_RELEASE(lock);
339 ldlm_lock_to_ns(lock)->ns_timeouts++;
340 LDLM_ERROR(lock, "lock callback timer expired after %lds: "
341 "evicting client at %s ",
342 cfs_time_current_sec()- lock->l_last_activity,
344 lock->l_export->exp_connection->c_peer.nid));
346 /* no needs to take an extra ref on the lock since it was in
347 * the waiting_locks_list and ldlm_add_waiting_lock()
348 * already grabbed a ref */
349 cfs_list_del(&lock->l_pending_chain);
350 cfs_list_add(&lock->l_pending_chain,
351 &expired_lock_thread.elt_expired_locks);
355 if (!cfs_list_empty(&expired_lock_thread.elt_expired_locks)) {
356 if (obd_dump_on_timeout && need_dump)
357 expired_lock_thread.elt_dump = __LINE__;
359 wake_up(&expired_lock_thread.elt_waitq);
363 * Make sure the timer will fire again if we have any locks
366 if (!cfs_list_empty(&waiting_locks_list)) {
367 cfs_time_t timeout_rounded;
368 lock = cfs_list_entry(waiting_locks_list.next, struct ldlm_lock,
370 timeout_rounded = (cfs_time_t)round_timeout(lock->l_callback_timeout);
371 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
373 spin_unlock_bh(&waiting_locks_spinlock);
377 * Add lock to the list of contended locks.
379 * Indicate that we're waiting for a client to call us back cancelling a given
380 * lock. We add it to the pending-callback chain, and schedule the lock-timeout
381 * timer to fire appropriately. (We round up to the next second, to avoid
382 * floods of timer firings during periods of high lock contention and traffic).
383 * As done by ldlm_add_waiting_lock(), the caller must grab a lock reference
384 * if it has been added to the waiting list (1 is returned).
386 * Called with the namespace lock held.
388 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, int seconds)
391 cfs_time_t timeout_rounded;
393 if (!cfs_list_empty(&lock->l_pending_chain))
396 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT) ||
397 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
400 timeout = cfs_time_shift(seconds);
401 if (likely(cfs_time_after(timeout, lock->l_callback_timeout)))
402 lock->l_callback_timeout = timeout;
404 timeout_rounded = round_timeout(lock->l_callback_timeout);
406 if (cfs_time_before(timeout_rounded,
407 cfs_timer_deadline(&waiting_locks_timer)) ||
408 !cfs_timer_is_armed(&waiting_locks_timer)) {
409 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
411 /* if the new lock has a shorter timeout than something earlier on
412 the list, we'll wait the longer amount of time; no big deal. */
414 cfs_list_add_tail(&lock->l_pending_chain, &waiting_locks_list);
418 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
421 int timeout = ldlm_get_enq_timeout(lock);
423 /* NB: must be called with hold of lock_res_and_lock() */
424 LASSERT(ldlm_is_res_locked(lock));
425 ldlm_set_waited(lock);
427 LASSERT(!ldlm_is_cancel_on_block(lock));
429 spin_lock_bh(&waiting_locks_spinlock);
430 if (ldlm_is_destroyed(lock)) {
431 static cfs_time_t next;
432 spin_unlock_bh(&waiting_locks_spinlock);
433 LDLM_ERROR(lock, "not waiting on destroyed lock (bug 5653)");
434 if (cfs_time_after(cfs_time_current(), next)) {
435 next = cfs_time_shift(14400);
436 libcfs_debug_dumpstack(NULL);
441 ret = __ldlm_add_waiting_lock(lock, timeout);
443 /* grab ref on the lock if it has been added to the
447 spin_unlock_bh(&waiting_locks_spinlock);
450 spin_lock_bh(&lock->l_export->exp_bl_list_lock);
451 if (cfs_list_empty(&lock->l_exp_list))
452 cfs_list_add(&lock->l_exp_list,
453 &lock->l_export->exp_bl_list);
454 spin_unlock_bh(&lock->l_export->exp_bl_list_lock);
457 LDLM_DEBUG(lock, "%sadding to wait list(timeout: %d, AT: %s)",
458 ret == 0 ? "not re-" : "", timeout,
459 AT_OFF ? "off" : "on");
464 * Remove a lock from the pending list, likely because it had its cancellation
465 * callback arrive without incident. This adjusts the lock-timeout timer if
466 * needed. Returns 0 if the lock wasn't pending after all, 1 if it was.
467 * As done by ldlm_del_waiting_lock(), the caller must release the lock
468 * reference when the lock is removed from any list (1 is returned).
470 * Called with namespace lock held.
472 static int __ldlm_del_waiting_lock(struct ldlm_lock *lock)
474 cfs_list_t *list_next;
476 if (cfs_list_empty(&lock->l_pending_chain))
479 list_next = lock->l_pending_chain.next;
480 if (lock->l_pending_chain.prev == &waiting_locks_list) {
481 /* Removing the head of the list, adjust timer. */
482 if (list_next == &waiting_locks_list) {
483 /* No more, just cancel. */
484 cfs_timer_disarm(&waiting_locks_timer);
486 struct ldlm_lock *next;
487 next = cfs_list_entry(list_next, struct ldlm_lock,
489 cfs_timer_arm(&waiting_locks_timer,
490 round_timeout(next->l_callback_timeout));
493 cfs_list_del_init(&lock->l_pending_chain);
498 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
502 if (lock->l_export == NULL) {
503 /* We don't have a "waiting locks list" on clients. */
504 CDEBUG(D_DLMTRACE, "Client lock %p : no-op\n", lock);
508 spin_lock_bh(&waiting_locks_spinlock);
509 ret = __ldlm_del_waiting_lock(lock);
510 spin_unlock_bh(&waiting_locks_spinlock);
512 /* remove the lock out of export blocking list */
513 spin_lock_bh(&lock->l_export->exp_bl_list_lock);
514 cfs_list_del_init(&lock->l_exp_list);
515 spin_unlock_bh(&lock->l_export->exp_bl_list_lock);
518 /* release lock ref if it has indeed been removed
520 LDLM_LOCK_RELEASE(lock);
523 LDLM_DEBUG(lock, "%s", ret == 0 ? "wasn't waiting" : "removed");
526 EXPORT_SYMBOL(ldlm_del_waiting_lock);
529 * Prolong the contended lock waiting time.
531 * Called with namespace lock held.
533 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout)
535 if (lock->l_export == NULL) {
536 /* We don't have a "waiting locks list" on clients. */
537 LDLM_DEBUG(lock, "client lock: no-op");
541 spin_lock_bh(&waiting_locks_spinlock);
543 if (cfs_list_empty(&lock->l_pending_chain)) {
544 spin_unlock_bh(&waiting_locks_spinlock);
545 LDLM_DEBUG(lock, "wasn't waiting");
549 /* we remove/add the lock to the waiting list, so no needs to
550 * release/take a lock reference */
551 __ldlm_del_waiting_lock(lock);
552 __ldlm_add_waiting_lock(lock, timeout);
553 spin_unlock_bh(&waiting_locks_spinlock);
555 LDLM_DEBUG(lock, "refreshed");
558 EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
560 #else /* !HAVE_SERVER_SUPPORT || !__KERNEL__ */
562 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
567 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout)
572 # ifdef HAVE_SERVER_SUPPORT
573 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
575 LASSERT(ldlm_is_res_locked(lock) && !ldlm_is_cancel_on_block(lock));
580 #endif /* HAVE_SERVER_SUPPORT && __KERNEL__ */
582 #ifdef HAVE_SERVER_SUPPORT
585 * Perform lock cleanup if AST sending failed.
587 static void ldlm_failed_ast(struct ldlm_lock *lock, int rc,
588 const char *ast_type)
590 LCONSOLE_ERROR_MSG(0x138, "%s: A client on nid %s was evicted due "
591 "to a lock %s callback time out: rc %d\n",
592 lock->l_export->exp_obd->obd_name,
593 obd_export_nid2str(lock->l_export), ast_type, rc);
595 if (obd_dump_on_timeout)
596 libcfs_debug_dumplog();
598 spin_lock_bh(&waiting_locks_spinlock);
599 if (__ldlm_del_waiting_lock(lock) == 0)
600 /* the lock was not in any list, grab an extra ref before adding
601 * the lock to the expired list */
603 cfs_list_add(&lock->l_pending_chain,
604 &expired_lock_thread.elt_expired_locks);
605 wake_up(&expired_lock_thread.elt_waitq);
606 spin_unlock_bh(&waiting_locks_spinlock);
608 class_fail_export(lock->l_export);
613 * Perform lock cleanup if AST reply came with error.
615 static int ldlm_handle_ast_error(struct ldlm_lock *lock,
616 struct ptlrpc_request *req, int rc,
617 const char *ast_type)
619 lnet_process_id_t peer = req->rq_import->imp_connection->c_peer;
621 if (rc == -ETIMEDOUT || rc == -EINTR || rc == -ENOTCONN) {
622 LASSERT(lock->l_export);
623 if (lock->l_export->exp_libclient) {
624 LDLM_DEBUG(lock, "%s AST to liblustre client (nid %s)"
625 " timeout, just cancelling lock", ast_type,
626 libcfs_nid2str(peer.nid));
627 ldlm_lock_cancel(lock);
629 } else if (ldlm_is_cancel(lock)) {
630 LDLM_DEBUG(lock, "%s AST timeout from nid %s, but "
631 "cancel was received (AST reply lost?)",
632 ast_type, libcfs_nid2str(peer.nid));
633 ldlm_lock_cancel(lock);
636 ldlm_del_waiting_lock(lock);
637 ldlm_failed_ast(lock, rc, ast_type);
641 struct ldlm_resource *res = lock->l_resource;
642 LDLM_DEBUG(lock, "client (nid %s) returned %d"
643 " from %s AST - normal race",
644 libcfs_nid2str(peer.nid),
646 lustre_msg_get_status(req->rq_repmsg) : -1,
649 /* update lvbo to return proper attributes.
651 ldlm_resource_getref(res);
652 ldlm_res_lvbo_update(res, NULL, 1);
653 ldlm_resource_putref(res);
657 LDLM_ERROR(lock, "client (nid %s) returned %d "
658 "from %s AST", libcfs_nid2str(peer.nid),
659 (req->rq_repmsg != NULL) ?
660 lustre_msg_get_status(req->rq_repmsg) : 0,
663 ldlm_lock_cancel(lock);
664 /* Server-side AST functions are called from ldlm_reprocess_all,
665 * which needs to be told to please restart its reprocessing. */
672 static int ldlm_cb_interpret(const struct lu_env *env,
673 struct ptlrpc_request *req, void *data, int rc)
675 struct ldlm_cb_async_args *ca = data;
676 struct ldlm_lock *lock = ca->ca_lock;
677 struct ldlm_cb_set_arg *arg = ca->ca_set_arg;
680 LASSERT(lock != NULL);
683 case LDLM_GL_CALLBACK:
684 /* Update the LVB from disk if the AST failed
685 * (this is a legal race)
687 * - Glimpse callback of local lock just returns
688 * -ELDLM_NO_LOCK_DATA.
689 * - Glimpse callback of remote lock might return
690 * -ELDLM_NO_LOCK_DATA when inode is cleared. LU-274
692 if (rc == -ELDLM_NO_LOCK_DATA) {
693 LDLM_DEBUG(lock, "lost race - client has a lock but no "
695 ldlm_res_lvbo_update(lock->l_resource, NULL, 1);
696 } else if (rc != 0) {
697 rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
699 rc = ldlm_res_lvbo_update(lock->l_resource, req, 1);
702 case LDLM_BL_CALLBACK:
704 rc = ldlm_handle_ast_error(lock, req, rc, "blocking");
706 case LDLM_CP_CALLBACK:
708 rc = ldlm_handle_ast_error(lock, req, rc, "completion");
711 LDLM_ERROR(lock, "invalid opcode for lock callback %d",
716 /* release extra reference taken in ldlm_ast_fini() */
717 LDLM_LOCK_RELEASE(lock);
720 atomic_inc(&arg->restart);
725 static inline int ldlm_ast_fini(struct ptlrpc_request *req,
726 struct ldlm_cb_set_arg *arg,
727 struct ldlm_lock *lock,
733 if (unlikely(instant_cancel)) {
734 rc = ptl_send_rpc(req, 1);
735 ptlrpc_req_finished(req);
737 atomic_inc(&arg->restart);
740 ptlrpc_set_add_req(arg->set, req);
747 * Check if there are requests in the export request list which prevent
748 * the lock canceling and make these requests high priority ones.
750 static void ldlm_lock_reorder_req(struct ldlm_lock *lock)
752 struct ptlrpc_request *req;
755 if (lock->l_export == NULL) {
756 LDLM_DEBUG(lock, "client lock: no-op");
760 spin_lock_bh(&lock->l_export->exp_rpc_lock);
761 cfs_list_for_each_entry(req, &lock->l_export->exp_hp_rpcs,
763 /* Do not process requests that were not yet added to there
764 * incoming queue or were already removed from there for
765 * processing. We evaluate ptlrpc_nrs_req_can_move() without
766 * holding svcpt->scp_req_lock, and then redo the check with
767 * the lock held once we need to obtain a reliable result.
769 if (ptlrpc_nrs_req_can_move(req) &&
770 req->rq_ops->hpreq_lock_match &&
771 req->rq_ops->hpreq_lock_match(req, lock))
772 ptlrpc_nrs_req_hp_move(req);
774 spin_unlock_bh(&lock->l_export->exp_rpc_lock);
779 * ->l_blocking_ast() method for server-side locks. This is invoked when newly
780 * enqueued server lock conflicts with given one.
782 * Sends blocking AST RPC to the client owning that lock; arms timeout timer
783 * to wait for client response.
785 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
786 struct ldlm_lock_desc *desc,
787 void *data, int flag)
789 struct ldlm_cb_async_args *ca;
790 struct ldlm_cb_set_arg *arg = data;
791 struct ldlm_request *body;
792 struct ptlrpc_request *req;
793 int instant_cancel = 0;
797 if (flag == LDLM_CB_CANCELING)
798 /* Don't need to do anything here. */
802 LASSERT(data != NULL);
803 if (lock->l_export->exp_obd->obd_recovering != 0)
804 LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
806 ldlm_lock_reorder_req(lock);
808 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
809 &RQF_LDLM_BL_CALLBACK,
810 LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK);
814 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
815 ca = ptlrpc_req_async_args(req);
816 ca->ca_set_arg = arg;
819 req->rq_interpret_reply = ldlm_cb_interpret;
820 req->rq_no_resend = 1;
822 lock_res_and_lock(lock);
823 if (lock->l_granted_mode != lock->l_req_mode) {
824 /* this blocking AST will be communicated as part of the
825 * completion AST instead */
826 unlock_res_and_lock(lock);
828 ptlrpc_req_finished(req);
829 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
833 if (ldlm_is_destroyed(lock)) {
834 /* What's the point? */
835 unlock_res_and_lock(lock);
836 ptlrpc_req_finished(req);
840 if (ldlm_is_cancel_on_block(lock))
843 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
844 body->lock_handle[0] = lock->l_remote_handle;
845 body->lock_desc = *desc;
846 body->lock_flags |= ldlm_flags_to_wire(lock->l_flags & LDLM_FL_AST_MASK);
848 LDLM_DEBUG(lock, "server preparing blocking AST");
850 ptlrpc_request_set_replen(req);
851 if (instant_cancel) {
852 unlock_res_and_lock(lock);
853 ldlm_lock_cancel(lock);
855 LASSERT(lock->l_granted_mode == lock->l_req_mode);
856 ldlm_add_waiting_lock(lock);
857 unlock_res_and_lock(lock);
860 req->rq_send_state = LUSTRE_IMP_FULL;
861 /* ptlrpc_request_alloc_pack already set timeout */
863 req->rq_timeout = ldlm_get_rq_timeout();
865 if (lock->l_export && lock->l_export->exp_nid_stats &&
866 lock->l_export->exp_nid_stats->nid_ldlm_stats)
867 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
868 LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
870 rc = ldlm_ast_fini(req, arg, lock, instant_cancel);
874 EXPORT_SYMBOL(ldlm_server_blocking_ast);
877 * ->l_completion_ast callback for a remote lock in server namespace.
879 * Sends AST to the client notifying it of lock granting. If initial
880 * lock response was not sent yet, instead of sending another RPC, just
881 * mark the lock as granted and client will understand
883 int ldlm_server_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data)
885 struct ldlm_cb_set_arg *arg = data;
886 struct ldlm_request *body;
887 struct ptlrpc_request *req;
888 struct ldlm_cb_async_args *ca;
889 long total_enqueue_wait;
890 int instant_cancel = 0;
895 LASSERT(lock != NULL);
896 LASSERT(data != NULL);
898 total_enqueue_wait = cfs_time_sub(cfs_time_current_sec(),
899 lock->l_last_activity);
901 req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse,
902 &RQF_LDLM_CP_CALLBACK);
906 /* server namespace, doesn't need lock */
907 lvb_len = ldlm_lvbo_size(lock);
908 /* LU-3124 & LU-2187: to not return layout in completion AST because
909 * it may deadlock for LU-2187, or client may not have enough space
910 * for large layout. The layout will be returned to client with an
911 * extra RPC to fetch xattr.lov */
912 if (ldlm_has_layout(lock))
915 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT, lvb_len);
916 rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK);
918 ptlrpc_request_free(req);
922 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
923 ca = ptlrpc_req_async_args(req);
924 ca->ca_set_arg = arg;
927 req->rq_interpret_reply = ldlm_cb_interpret;
928 req->rq_no_resend = 1;
929 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
931 body->lock_handle[0] = lock->l_remote_handle;
932 body->lock_flags = ldlm_flags_to_wire(flags);
933 ldlm_lock2desc(lock, &body->lock_desc);
935 void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB);
937 lvb_len = ldlm_lvbo_fill(lock, lvb, lvb_len);
939 /* We still need to send the RPC to wake up the blocked
940 * enqueue thread on the client.
942 * Consider old client, there is no better way to notify
943 * the failure, just zero-sized the LVB, then the client
944 * will fail out as "-EPROTO". */
945 req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, 0,
949 req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, lvb_len,
954 LDLM_DEBUG(lock, "server preparing completion AST (after %lds wait)",
957 /* Server-side enqueue wait time estimate, used in
958 __ldlm_add_waiting_lock to set future enqueue timers */
959 if (total_enqueue_wait < ldlm_get_enq_timeout(lock))
960 at_measured(ldlm_lock_to_ns_at(lock),
963 /* bz18618. Don't add lock enqueue time we spend waiting for a
964 previous callback to fail. Locks waiting legitimately will
965 get extended by ldlm_refresh_waiting_lock regardless of the
966 estimate, so it's okay to underestimate here. */
967 LDLM_DEBUG(lock, "lock completed after %lus; estimate was %ds. "
968 "It is likely that a previous callback timed out.",
970 at_get(ldlm_lock_to_ns_at(lock)));
972 ptlrpc_request_set_replen(req);
974 req->rq_send_state = LUSTRE_IMP_FULL;
975 /* ptlrpc_request_pack already set timeout */
977 req->rq_timeout = ldlm_get_rq_timeout();
979 /* We only send real blocking ASTs after the lock is granted */
980 lock_res_and_lock(lock);
981 if (ldlm_is_ast_sent(lock)) {
982 body->lock_flags |= ldlm_flags_to_wire(LDLM_FL_AST_SENT);
983 /* Copy AST flags like LDLM_FL_DISCARD_DATA. */
984 body->lock_flags |= ldlm_flags_to_wire(lock->l_flags &
987 /* We might get here prior to ldlm_handle_enqueue setting
988 * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
989 * into waiting list, but this is safe and similar code in
990 * ldlm_handle_enqueue will call ldlm_lock_cancel() still,
991 * that would not only cancel the lock, but will also remove
992 * it from waiting list */
993 if (ldlm_is_cancel_on_block(lock)) {
994 unlock_res_and_lock(lock);
995 ldlm_lock_cancel(lock);
997 lock_res_and_lock(lock);
999 /* start the lock-timeout clock */
1000 ldlm_add_waiting_lock(lock);
1003 unlock_res_and_lock(lock);
1005 if (lock->l_export && lock->l_export->exp_nid_stats &&
1006 lock->l_export->exp_nid_stats->nid_ldlm_stats)
1007 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
1008 LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
1010 rc = ldlm_ast_fini(req, arg, lock, instant_cancel);
1012 RETURN(lvb_len < 0 ? lvb_len : rc);
1014 EXPORT_SYMBOL(ldlm_server_completion_ast);
1017 * Server side ->l_glimpse_ast handler for client locks.
1019 * Sends glimpse AST to the client and waits for reply. Then updates
1020 * lvbo with the result.
1022 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
1024 struct ldlm_cb_set_arg *arg = data;
1025 struct ldlm_request *body;
1026 struct ptlrpc_request *req;
1027 struct ldlm_cb_async_args *ca;
1029 struct req_format *req_fmt;
1032 LASSERT(lock != NULL);
1034 if (arg->gl_desc != NULL)
1035 /* There is a glimpse descriptor to pack */
1036 req_fmt = &RQF_LDLM_GL_DESC_CALLBACK;
1038 req_fmt = &RQF_LDLM_GL_CALLBACK;
1040 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
1041 req_fmt, LUSTRE_DLM_VERSION,
1047 if (arg->gl_desc != NULL) {
1048 /* copy the GL descriptor */
1049 union ldlm_gl_desc *desc;
1050 desc = req_capsule_client_get(&req->rq_pill, &RMF_DLM_GL_DESC);
1051 *desc = *arg->gl_desc;
1054 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1055 body->lock_handle[0] = lock->l_remote_handle;
1056 ldlm_lock2desc(lock, &body->lock_desc);
1058 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
1059 ca = ptlrpc_req_async_args(req);
1060 ca->ca_set_arg = arg;
1063 /* server namespace, doesn't need lock */
1064 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
1065 ldlm_lvbo_size(lock));
1066 ptlrpc_request_set_replen(req);
1068 req->rq_send_state = LUSTRE_IMP_FULL;
1069 /* ptlrpc_request_alloc_pack already set timeout */
1071 req->rq_timeout = ldlm_get_rq_timeout();
1073 req->rq_interpret_reply = ldlm_cb_interpret;
1075 if (lock->l_export && lock->l_export->exp_nid_stats &&
1076 lock->l_export->exp_nid_stats->nid_ldlm_stats)
1077 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
1078 LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
1080 rc = ldlm_ast_fini(req, arg, lock, 0);
1084 EXPORT_SYMBOL(ldlm_server_glimpse_ast);
1086 int ldlm_glimpse_locks(struct ldlm_resource *res, cfs_list_t *gl_work_list)
1091 rc = ldlm_run_ast_work(ldlm_res_to_ns(res), gl_work_list,
1093 if (rc == -ERESTART)
1094 ldlm_reprocess_all(res);
1098 EXPORT_SYMBOL(ldlm_glimpse_locks);
1100 /* return LDLM lock associated with a lock callback request */
1101 struct ldlm_lock *ldlm_request_lock(struct ptlrpc_request *req)
1103 struct ldlm_cb_async_args *ca;
1104 struct ldlm_lock *lock;
1107 ca = ptlrpc_req_async_args(req);
1110 RETURN(ERR_PTR(-EFAULT));
1114 EXPORT_SYMBOL(ldlm_request_lock);
1116 static void ldlm_svc_get_eopc(const struct ldlm_request *dlm_req,
1117 struct lprocfs_stats *srv_stats)
1119 int lock_type = 0, op = 0;
1121 lock_type = dlm_req->lock_desc.l_resource.lr_type;
1123 switch (lock_type) {
1125 op = PTLRPC_LAST_CNTR + LDLM_PLAIN_ENQUEUE;
1128 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT)
1129 op = PTLRPC_LAST_CNTR + LDLM_GLIMPSE_ENQUEUE;
1131 op = PTLRPC_LAST_CNTR + LDLM_EXTENT_ENQUEUE;
1134 op = PTLRPC_LAST_CNTR + LDLM_FLOCK_ENQUEUE;
1137 op = PTLRPC_LAST_CNTR + LDLM_IBITS_ENQUEUE;
1145 lprocfs_counter_incr(srv_stats, op);
1151 * Main server-side entry point into LDLM for enqueue. This is called by ptlrpc
1152 * service threads to carry out client lock enqueueing requests.
1154 int ldlm_handle_enqueue0(struct ldlm_namespace *ns,
1155 struct ptlrpc_request *req,
1156 const struct ldlm_request *dlm_req,
1157 const struct ldlm_callback_suite *cbs)
1159 struct ldlm_reply *dlm_rep;
1161 ldlm_error_t err = ELDLM_OK;
1162 struct ldlm_lock *lock = NULL;
1163 void *cookie = NULL;
1167 LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
1169 ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF);
1170 flags = ldlm_flags_from_wire(dlm_req->lock_flags);
1172 LASSERT(req->rq_export);
1174 if (ptlrpc_req2svc(req)->srv_stats != NULL)
1175 ldlm_svc_get_eopc(dlm_req, ptlrpc_req2svc(req)->srv_stats);
1177 if (req->rq_export && req->rq_export->exp_nid_stats &&
1178 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1179 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1180 LDLM_ENQUEUE - LDLM_FIRST_OPC);
1182 if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE ||
1183 dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) {
1184 DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
1185 dlm_req->lock_desc.l_resource.lr_type);
1186 GOTO(out, rc = -EFAULT);
1189 if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE ||
1190 dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE ||
1191 dlm_req->lock_desc.l_req_mode &
1192 (dlm_req->lock_desc.l_req_mode-1))) {
1193 DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
1194 dlm_req->lock_desc.l_req_mode);
1195 GOTO(out, rc = -EFAULT);
1198 if (exp_connect_flags(req->rq_export) & OBD_CONNECT_IBITS) {
1199 if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1201 DEBUG_REQ(D_ERROR, req,
1202 "PLAIN lock request from IBITS client?");
1203 GOTO(out, rc = -EPROTO);
1205 } else if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1207 DEBUG_REQ(D_ERROR, req,
1208 "IBITS lock request from unaware client?");
1209 GOTO(out, rc = -EPROTO);
1213 /* FIXME this makes it impossible to use LDLM_PLAIN locks -- check
1214 against server's _CONNECT_SUPPORTED flags? (I don't want to use
1215 ibits for mgc/mgs) */
1217 /* INODEBITS_INTEROP: Perform conversion from plain lock to
1218 * inodebits lock if client does not support them. */
1219 if (!(exp_connect_flags(req->rq_export) & OBD_CONNECT_IBITS) &&
1220 (dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN)) {
1221 dlm_req->lock_desc.l_resource.lr_type = LDLM_IBITS;
1222 dlm_req->lock_desc.l_policy_data.l_inodebits.bits =
1223 MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE;
1224 if (dlm_req->lock_desc.l_req_mode == LCK_PR)
1225 dlm_req->lock_desc.l_req_mode = LCK_CR;
1229 if (unlikely(flags & LDLM_FL_REPLAY)) {
1230 /* Find an existing lock in the per-export lock hash */
1231 /* In the function below, .hs_keycmp resolves to
1232 * ldlm_export_lock_keycmp() */
1233 /* coverity[overrun-buffer-val] */
1234 lock = cfs_hash_lookup(req->rq_export->exp_lock_hash,
1235 (void *)&dlm_req->lock_handle[0]);
1237 DEBUG_REQ(D_DLMTRACE, req, "found existing lock cookie "
1238 LPX64, lock->l_handle.h_cookie);
1239 GOTO(existing_lock, rc = 0);
1243 /* The lock's callback data might be set in the policy function */
1244 lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
1245 dlm_req->lock_desc.l_resource.lr_type,
1246 dlm_req->lock_desc.l_req_mode,
1247 cbs, NULL, 0, LVB_T_NONE);
1249 GOTO(out, rc = PTR_ERR(lock));
1251 lock->l_last_activity = cfs_time_current_sec();
1252 lock->l_remote_handle = dlm_req->lock_handle[0];
1253 LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
1255 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
1256 /* Don't enqueue a lock onto the export if it is been disonnected
1257 * due to eviction (bug 3822) or server umount (bug 24324).
1258 * Cancel it now instead. */
1259 if (req->rq_export->exp_disconnected) {
1260 LDLM_ERROR(lock, "lock on disconnected export %p",
1262 GOTO(out, rc = -ENOTCONN);
1265 lock->l_export = class_export_lock_get(req->rq_export, lock);
1266 if (lock->l_export->exp_lock_hash)
1267 cfs_hash_add(lock->l_export->exp_lock_hash,
1268 &lock->l_remote_handle,
1273 if (flags & LDLM_FL_HAS_INTENT) {
1274 /* In this case, the reply buffer is allocated deep in
1275 * local_lock_enqueue by the policy function. */
1278 /* based on the assumption that lvb size never changes during
1279 * resource life time otherwise it need resource->lr_lock's
1281 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
1282 RCL_SERVER, ldlm_lvbo_size(lock));
1284 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
1285 GOTO(out, rc = -ENOMEM);
1287 rc = req_capsule_server_pack(&req->rq_pill);
1292 if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN)
1293 ldlm_convert_policy_to_local(req->rq_export,
1294 dlm_req->lock_desc.l_resource.lr_type,
1295 &dlm_req->lock_desc.l_policy_data,
1296 &lock->l_policy_data);
1297 if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
1298 lock->l_req_extent = lock->l_policy_data.l_extent;
1300 err = ldlm_lock_enqueue(ns, &lock, cookie, &flags);
1307 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1308 dlm_rep->lock_flags = ldlm_flags_to_wire(flags);
1310 ldlm_lock2desc(lock, &dlm_rep->lock_desc);
1311 ldlm_lock2handle(lock, &dlm_rep->lock_handle);
1313 /* We never send a blocking AST until the lock is granted, but
1314 * we can tell it right now */
1315 lock_res_and_lock(lock);
1317 /* Now take into account flags to be inherited from original lock
1318 request both in reply to client and in our own lock flags. */
1319 dlm_rep->lock_flags |= dlm_req->lock_flags & LDLM_FL_INHERIT_MASK;
1320 lock->l_flags |= ldlm_flags_from_wire(dlm_req->lock_flags &
1321 LDLM_FL_INHERIT_MASK);
1323 /* Don't move a pending lock onto the export if it has already been
1324 * disconnected due to eviction (bug 5683) or server umount (bug 24324).
1325 * Cancel it now instead. */
1326 if (unlikely(req->rq_export->exp_disconnected ||
1327 OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
1328 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1330 } else if (ldlm_is_ast_sent(lock)) {
1331 dlm_rep->lock_flags |= ldlm_flags_to_wire(LDLM_FL_AST_SENT);
1332 if (lock->l_granted_mode == lock->l_req_mode) {
1334 * Only cancel lock if it was granted, because it would
1335 * be destroyed immediately and would never be granted
1336 * in the future, causing timeouts on client. Not
1337 * granted lock will be cancelled immediately after
1338 * sending completion AST.
1340 if (dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1341 unlock_res_and_lock(lock);
1342 ldlm_lock_cancel(lock);
1343 lock_res_and_lock(lock);
1345 ldlm_add_waiting_lock(lock);
1348 /* Make sure we never ever grant usual metadata locks to liblustre
1350 if ((dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN ||
1351 dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) &&
1352 req->rq_export->exp_libclient) {
1353 if (unlikely(!ldlm_is_cancel_on_block(lock) ||
1354 !(dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK))){
1355 CERROR("Granting sync lock to libclient. "
1356 "req fl %d, rep fl %d, lock fl "LPX64"\n",
1357 dlm_req->lock_flags, dlm_rep->lock_flags,
1359 LDLM_ERROR(lock, "sync lock");
1360 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT) {
1361 struct ldlm_intent *it;
1363 it = req_capsule_client_get(&req->rq_pill,
1366 CERROR("This is intent %s ("LPU64")\n",
1367 ldlm_it2str(it->opc), it->opc);
1373 unlock_res_and_lock(lock);
1377 req->rq_status = rc ?: err; /* return either error - bug 11190 */
1378 if (!req->rq_packed_final) {
1379 err = lustre_pack_reply(req, 1, NULL, NULL);
1384 /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
1385 * ldlm_reprocess_all. If this moves, revisit that code. -phil */
1386 if (!IS_ERR(lock)) {
1387 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
1388 "(err=%d, rc=%d)", err, rc);
1391 if (req_capsule_has_field(&req->rq_pill, &RMF_DLM_LVB,
1393 ldlm_lvbo_size(lock) > 0) {
1397 buf = req_capsule_server_get(&req->rq_pill,
1399 LASSERTF(buf != NULL, "req %p, lock %p\n",
1401 buflen = req_capsule_get_size(&req->rq_pill,
1402 &RMF_DLM_LVB, RCL_SERVER);
1404 buflen = ldlm_lvbo_fill(lock, buf,
1410 buflen, RCL_SERVER);
1418 lock_res_and_lock(lock);
1419 ldlm_resource_unlink_lock(lock);
1420 ldlm_lock_destroy_nolock(lock);
1421 unlock_res_and_lock(lock);
1424 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
1425 ldlm_reprocess_all(lock->l_resource);
1427 LDLM_LOCK_RELEASE(lock);
1430 LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
1435 EXPORT_SYMBOL(ldlm_handle_enqueue0);
1438 * Old-style LDLM main entry point for server code enqueue.
1440 int ldlm_handle_enqueue(struct ptlrpc_request *req,
1441 ldlm_completion_callback completion_callback,
1442 ldlm_blocking_callback blocking_callback,
1443 ldlm_glimpse_callback glimpse_callback)
1445 struct ldlm_request *dlm_req;
1446 struct ldlm_callback_suite cbs = {
1447 .lcs_completion = completion_callback,
1448 .lcs_blocking = blocking_callback,
1449 .lcs_glimpse = glimpse_callback
1453 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1454 if (dlm_req != NULL) {
1455 rc = ldlm_handle_enqueue0(req->rq_export->exp_obd->obd_namespace,
1456 req, dlm_req, &cbs);
1462 EXPORT_SYMBOL(ldlm_handle_enqueue);
1465 * Main LDLM entry point for server code to process lock conversion requests.
1467 int ldlm_handle_convert0(struct ptlrpc_request *req,
1468 const struct ldlm_request *dlm_req)
1470 struct ldlm_reply *dlm_rep;
1471 struct ldlm_lock *lock;
1475 if (req->rq_export && req->rq_export->exp_nid_stats &&
1476 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1477 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1478 LDLM_CONVERT - LDLM_FIRST_OPC);
1480 rc = req_capsule_server_pack(&req->rq_pill);
1484 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1485 dlm_rep->lock_flags = dlm_req->lock_flags;
1487 lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
1489 req->rq_status = LUSTRE_EINVAL;
1493 LDLM_DEBUG(lock, "server-side convert handler START");
1495 lock->l_last_activity = cfs_time_current_sec();
1496 res = ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
1497 &dlm_rep->lock_flags);
1499 if (ldlm_del_waiting_lock(lock))
1500 LDLM_DEBUG(lock, "converted waiting lock");
1503 req->rq_status = LUSTRE_EDEADLK;
1508 if (!req->rq_status)
1509 ldlm_reprocess_all(lock->l_resource);
1510 LDLM_DEBUG(lock, "server-side convert handler END");
1511 LDLM_LOCK_PUT(lock);
1513 LDLM_DEBUG_NOLOCK("server-side convert handler END");
1517 EXPORT_SYMBOL(ldlm_handle_convert0);
1520 * Old-style main LDLM entry point for server code to process lock conversion
1523 int ldlm_handle_convert(struct ptlrpc_request *req)
1526 struct ldlm_request *dlm_req;
1528 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1529 if (dlm_req != NULL) {
1530 rc = ldlm_handle_convert0(req, dlm_req);
1532 CERROR ("Can't unpack dlm_req\n");
1537 EXPORT_SYMBOL(ldlm_handle_convert);
1540 * Cancel all the locks whose handles are packed into ldlm_request
1542 * Called by server code expecting such combined cancel activity
1545 int ldlm_request_cancel(struct ptlrpc_request *req,
1546 const struct ldlm_request *dlm_req, int first)
1548 struct ldlm_resource *res, *pres = NULL;
1549 struct ldlm_lock *lock;
1550 int i, count, done = 0;
1553 count = dlm_req->lock_count ? dlm_req->lock_count : 1;
1557 if (count == 1 && dlm_req->lock_handle[0].cookie == 0)
1560 /* There is no lock on the server at the replay time,
1561 * skip lock cancelling to make replay tests to pass. */
1562 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1565 LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, "
1566 "starting at %d", count, first);
1568 for (i = first; i < count; i++) {
1569 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
1571 LDLM_DEBUG_NOLOCK("server-side cancel handler stale "
1572 "lock (cookie "LPU64")",
1573 dlm_req->lock_handle[i].cookie);
1577 res = lock->l_resource;
1580 /* This code is an optimization to only attempt lock
1581 * granting on the resource (that could be CPU-expensive)
1582 * after we are done cancelling lock in that resource. */
1585 ldlm_reprocess_all(pres);
1586 LDLM_RESOURCE_DELREF(pres);
1587 ldlm_resource_putref(pres);
1590 ldlm_resource_getref(res);
1591 LDLM_RESOURCE_ADDREF(res);
1592 ldlm_res_lvbo_update(res, NULL, 1);
1596 ldlm_lock_cancel(lock);
1597 LDLM_LOCK_PUT(lock);
1600 ldlm_reprocess_all(pres);
1601 LDLM_RESOURCE_DELREF(pres);
1602 ldlm_resource_putref(pres);
1604 LDLM_DEBUG_NOLOCK("server-side cancel handler END");
1607 EXPORT_SYMBOL(ldlm_request_cancel);
1610 * Main LDLM entry point for server code to cancel locks.
1612 * Typically gets called from service handler on LDLM_CANCEL opc.
1614 int ldlm_handle_cancel(struct ptlrpc_request *req)
1616 struct ldlm_request *dlm_req;
1620 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1621 if (dlm_req == NULL) {
1622 CDEBUG(D_INFO, "bad request buffer for cancel\n");
1626 if (req->rq_export && req->rq_export->exp_nid_stats &&
1627 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1628 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1629 LDLM_CANCEL - LDLM_FIRST_OPC);
1631 rc = req_capsule_server_pack(&req->rq_pill);
1635 if (!ldlm_request_cancel(req, dlm_req, 0))
1636 req->rq_status = LUSTRE_ESTALE;
1638 RETURN(ptlrpc_reply(req));
1640 EXPORT_SYMBOL(ldlm_handle_cancel);
1641 #endif /* HAVE_SERVER_SUPPORT */
1644 * Callback handler for receiving incoming blocking ASTs.
1646 * This can only happen on client side.
1648 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
1649 struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1654 LDLM_DEBUG(lock, "client blocking AST callback handler");
1656 lock_res_and_lock(lock);
1657 ldlm_set_cbpending(lock);
1659 if (ldlm_is_cancel_on_block(lock))
1660 ldlm_set_cancel(lock);
1662 do_ast = (!lock->l_readers && !lock->l_writers);
1663 unlock_res_and_lock(lock);
1666 CDEBUG(D_DLMTRACE, "Lock %p already unused, calling callback (%p)\n",
1667 lock, lock->l_blocking_ast);
1668 if (lock->l_blocking_ast != NULL)
1669 lock->l_blocking_ast(lock, ld, lock->l_ast_data,
1672 CDEBUG(D_DLMTRACE, "Lock %p is referenced, will be cancelled later\n",
1676 LDLM_DEBUG(lock, "client blocking callback handler END");
1677 LDLM_LOCK_RELEASE(lock);
1682 * Callback handler for receiving incoming completion ASTs.
1684 * This only can happen on client side.
1686 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
1687 struct ldlm_namespace *ns,
1688 struct ldlm_request *dlm_req,
1689 struct ldlm_lock *lock)
1692 CFS_LIST_HEAD(ast_list);
1696 LDLM_DEBUG(lock, "client completion callback handler START");
1698 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) {
1699 int to = cfs_time_seconds(1);
1701 schedule_timeout_and_set_state(
1702 TASK_INTERRUPTIBLE, to);
1703 if (lock->l_granted_mode == lock->l_req_mode ||
1704 ldlm_is_destroyed(lock))
1709 lvb_len = req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT);
1711 LDLM_ERROR(lock, "Fail to get lvb_len, rc = %d", lvb_len);
1712 GOTO(out, rc = lvb_len);
1713 } else if (lvb_len > 0) {
1714 if (lock->l_lvb_len > 0) {
1715 /* for extent lock, lvb contains ost_lvb{}. */
1716 LASSERT(lock->l_lvb_data != NULL);
1718 if (unlikely(lock->l_lvb_len < lvb_len)) {
1719 LDLM_ERROR(lock, "Replied LVB is larger than "
1720 "expectation, expected = %d, "
1722 lock->l_lvb_len, lvb_len);
1723 GOTO(out, rc = -EINVAL);
1725 } else if (ldlm_has_layout(lock)) { /* for layout lock, lvb has
1726 * variable length */
1729 OBD_ALLOC_LARGE(lvb_data, lvb_len);
1730 if (lvb_data == NULL) {
1731 LDLM_ERROR(lock, "No memory: %d.\n", lvb_len);
1732 GOTO(out, rc = -ENOMEM);
1735 lock_res_and_lock(lock);
1736 LASSERT(lock->l_lvb_data == NULL);
1737 lock->l_lvb_type = LVB_T_LAYOUT;
1738 lock->l_lvb_data = lvb_data;
1739 lock->l_lvb_len = lvb_len;
1740 unlock_res_and_lock(lock);
1744 lock_res_and_lock(lock);
1745 if (ldlm_is_destroyed(lock) ||
1746 lock->l_granted_mode == lock->l_req_mode) {
1747 /* bug 11300: the lock has already been granted */
1748 unlock_res_and_lock(lock);
1749 LDLM_DEBUG(lock, "Double grant race happened");
1753 /* If we receive the completion AST before the actual enqueue returned,
1754 * then we might need to switch lock modes, resources, or extents. */
1755 if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
1756 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
1757 LDLM_DEBUG(lock, "completion AST, new lock mode");
1760 if (lock->l_resource->lr_type != LDLM_PLAIN) {
1761 ldlm_convert_policy_to_local(req->rq_export,
1762 dlm_req->lock_desc.l_resource.lr_type,
1763 &dlm_req->lock_desc.l_policy_data,
1764 &lock->l_policy_data);
1765 LDLM_DEBUG(lock, "completion AST, new policy data");
1768 ldlm_resource_unlink_lock(lock);
1769 if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
1770 &lock->l_resource->lr_name,
1771 sizeof(lock->l_resource->lr_name)) != 0) {
1772 unlock_res_and_lock(lock);
1773 rc = ldlm_lock_change_resource(ns, lock,
1774 &dlm_req->lock_desc.l_resource.lr_name);
1776 LDLM_ERROR(lock, "Failed to allocate resource");
1779 LDLM_DEBUG(lock, "completion AST, new resource");
1780 CERROR("change resource!\n");
1781 lock_res_and_lock(lock);
1784 if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
1785 /* BL_AST locks are not needed in LRU.
1786 * Let ldlm_cancel_lru() be fast. */
1787 ldlm_lock_remove_from_lru(lock);
1788 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
1789 LDLM_DEBUG(lock, "completion AST includes blocking AST");
1792 if (lock->l_lvb_len > 0) {
1793 rc = ldlm_fill_lvb(lock, &req->rq_pill, RCL_CLIENT,
1794 lock->l_lvb_data, lvb_len);
1796 unlock_res_and_lock(lock);
1801 ldlm_grant_lock(lock, &ast_list);
1802 unlock_res_and_lock(lock);
1804 LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
1806 /* Let Enqueue to call osc_lock_upcall() and initialize
1808 OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 2);
1810 ldlm_run_ast_work(ns, &ast_list, LDLM_WORK_CP_AST);
1812 LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
1818 lock_res_and_lock(lock);
1819 ldlm_set_failed(lock);
1820 unlock_res_and_lock(lock);
1821 wake_up(&lock->l_waitq);
1823 LDLM_LOCK_RELEASE(lock);
1827 * Callback handler for receiving incoming glimpse ASTs.
1829 * This only can happen on client side. After handling the glimpse AST
1830 * we also consider dropping the lock here if it is unused locally for a
1833 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
1834 struct ldlm_namespace *ns,
1835 struct ldlm_request *dlm_req,
1836 struct ldlm_lock *lock)
1841 LDLM_DEBUG(lock, "client glimpse AST callback handler");
1843 if (lock->l_glimpse_ast != NULL)
1844 rc = lock->l_glimpse_ast(lock, req);
1846 if (req->rq_repmsg != NULL) {
1849 req->rq_status = rc;
1853 lock_res_and_lock(lock);
1854 if (lock->l_granted_mode == LCK_PW &&
1855 !lock->l_readers && !lock->l_writers &&
1856 cfs_time_after(cfs_time_current(),
1857 cfs_time_add(lock->l_last_used,
1858 cfs_time_seconds(10)))) {
1859 unlock_res_and_lock(lock);
1860 if (ldlm_bl_to_thread_lock(ns, NULL, lock))
1861 ldlm_handle_bl_callback(ns, NULL, lock);
1866 unlock_res_and_lock(lock);
1867 LDLM_LOCK_RELEASE(lock);
1871 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1873 if (req->rq_no_reply)
1876 req->rq_status = rc;
1877 if (!req->rq_packed_final) {
1878 rc = lustre_pack_reply(req, 1, NULL, NULL);
1882 return ptlrpc_reply(req);
1886 static int __ldlm_bl_to_thread(struct ldlm_bl_work_item *blwi,
1887 ldlm_cancel_flags_t cancel_flags)
1889 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1892 spin_lock(&blp->blp_lock);
1893 if (blwi->blwi_lock &&
1894 ldlm_is_discard_data(blwi->blwi_lock)) {
1895 /* add LDLM_FL_DISCARD_DATA requests to the priority list */
1896 cfs_list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
1898 /* other blocking callbacks are added to the regular list */
1899 cfs_list_add_tail(&blwi->blwi_entry, &blp->blp_list);
1901 spin_unlock(&blp->blp_lock);
1903 wake_up(&blp->blp_waitq);
1905 /* can not check blwi->blwi_flags as blwi could be already freed in
1907 if (!(cancel_flags & LCF_ASYNC))
1908 wait_for_completion(&blwi->blwi_comp);
1913 static inline void init_blwi(struct ldlm_bl_work_item *blwi,
1914 struct ldlm_namespace *ns,
1915 struct ldlm_lock_desc *ld,
1916 cfs_list_t *cancels, int count,
1917 struct ldlm_lock *lock,
1918 ldlm_cancel_flags_t cancel_flags)
1920 init_completion(&blwi->blwi_comp);
1921 CFS_INIT_LIST_HEAD(&blwi->blwi_head);
1923 if (memory_pressure_get())
1924 blwi->blwi_mem_pressure = 1;
1927 blwi->blwi_flags = cancel_flags;
1929 blwi->blwi_ld = *ld;
1931 cfs_list_add(&blwi->blwi_head, cancels);
1932 cfs_list_del_init(cancels);
1933 blwi->blwi_count = count;
1935 blwi->blwi_lock = lock;
1940 * Queues a list of locks \a cancels containing \a count locks
1941 * for later processing by a blocking thread. If \a count is zero,
1942 * then the lock referenced as \a lock is queued instead.
1944 * The blocking thread would then call ->l_blocking_ast callback in the lock.
1945 * If list addition fails an error is returned and caller is supposed to
1946 * call ->l_blocking_ast itself.
1948 static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
1949 struct ldlm_lock_desc *ld,
1950 struct ldlm_lock *lock,
1951 cfs_list_t *cancels, int count,
1952 ldlm_cancel_flags_t cancel_flags)
1956 if (cancels && count == 0)
1959 if (cancel_flags & LCF_ASYNC) {
1960 struct ldlm_bl_work_item *blwi;
1962 OBD_ALLOC(blwi, sizeof(*blwi));
1965 init_blwi(blwi, ns, ld, cancels, count, lock, cancel_flags);
1967 RETURN(__ldlm_bl_to_thread(blwi, cancel_flags));
1969 /* if it is synchronous call do minimum mem alloc, as it could
1970 * be triggered from kernel shrinker
1972 struct ldlm_bl_work_item blwi;
1974 memset(&blwi, 0, sizeof(blwi));
1975 init_blwi(&blwi, ns, ld, cancels, count, lock, cancel_flags);
1976 RETURN(__ldlm_bl_to_thread(&blwi, cancel_flags));
1982 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1983 struct ldlm_lock *lock)
1986 return ldlm_bl_to_thread(ns, ld, lock, NULL, 0, LCF_ASYNC);
1992 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1993 cfs_list_t *cancels, int count,
1994 ldlm_cancel_flags_t cancel_flags)
1997 return ldlm_bl_to_thread(ns, ld, NULL, cancels, count, cancel_flags);
2003 /* Setinfo coming from Server (eg MDT) to Client (eg MDC)! */
2004 static int ldlm_handle_setinfo(struct ptlrpc_request *req)
2006 struct obd_device *obd = req->rq_export->exp_obd;
2013 DEBUG_REQ(D_HSM, req, "%s: handle setinfo\n", obd->obd_name);
2015 req_capsule_set(&req->rq_pill, &RQF_OBD_SET_INFO);
2017 key = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
2019 DEBUG_REQ(D_IOCTL, req, "no set_info key");
2022 keylen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_KEY,
2024 val = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
2026 DEBUG_REQ(D_IOCTL, req, "no set_info val");
2029 vallen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_VAL,
2032 /* We are responsible for swabbing contents of val */
2034 if (KEY_IS(KEY_HSM_COPYTOOL_SEND))
2035 /* Pass it on to mdc (the "export" in this case) */
2036 rc = obd_set_info_async(req->rq_svc_thread->t_env,
2038 sizeof(KEY_HSM_COPYTOOL_SEND),
2039 KEY_HSM_COPYTOOL_SEND,
2042 DEBUG_REQ(D_WARNING, req, "ignoring unknown key %s", key);
2047 static inline void ldlm_callback_errmsg(struct ptlrpc_request *req,
2048 const char *msg, int rc,
2049 struct lustre_handle *handle)
2051 DEBUG_REQ((req->rq_no_reply || rc) ? D_WARNING : D_DLMTRACE, req,
2052 "%s: [nid %s] [rc %d] [lock "LPX64"]",
2053 msg, libcfs_id2str(req->rq_peer), rc,
2054 handle ? handle->cookie : 0);
2055 if (req->rq_no_reply)
2056 CWARN("No reply was sent, maybe cause bug 21636.\n");
2058 CWARN("Send reply failed, maybe cause bug 21636.\n");
2061 static int ldlm_handle_qc_callback(struct ptlrpc_request *req)
2063 struct obd_quotactl *oqctl;
2064 struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2066 oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2067 if (oqctl == NULL) {
2068 CERROR("Can't unpack obd_quotactl\n");
2072 oqctl->qc_stat = ptlrpc_status_ntoh(oqctl->qc_stat);
2074 cli->cl_qchk_stat = oqctl->qc_stat;
2078 /* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */
2079 static int ldlm_callback_handler(struct ptlrpc_request *req)
2081 struct ldlm_namespace *ns;
2082 struct ldlm_request *dlm_req;
2083 struct ldlm_lock *lock;
2087 /* Requests arrive in sender's byte order. The ptlrpc service
2088 * handler has already checked and, if necessary, byte-swapped the
2089 * incoming request message body, but I am responsible for the
2090 * message buffers. */
2092 /* do nothing for sec context finalize */
2093 if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI)
2096 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2098 if (req->rq_export == NULL) {
2099 rc = ldlm_callback_reply(req, -ENOTCONN);
2100 ldlm_callback_errmsg(req, "Operate on unconnected server",
2105 LASSERT(req->rq_export != NULL);
2106 LASSERT(req->rq_export->exp_obd != NULL);
2108 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2109 case LDLM_BL_CALLBACK:
2110 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET))
2113 case LDLM_CP_CALLBACK:
2114 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK_NET))
2117 case LDLM_GL_CALLBACK:
2118 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK_NET))
2122 rc = ldlm_handle_setinfo(req);
2123 ldlm_callback_reply(req, rc);
2125 case LLOG_ORIGIN_HANDLE_CREATE:
2126 req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
2127 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
2129 rc = llog_origin_handle_open(req);
2130 ldlm_callback_reply(req, rc);
2132 case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
2133 req_capsule_set(&req->rq_pill,
2134 &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
2135 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
2137 rc = llog_origin_handle_next_block(req);
2138 ldlm_callback_reply(req, rc);
2140 case LLOG_ORIGIN_HANDLE_READ_HEADER:
2141 req_capsule_set(&req->rq_pill,
2142 &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER);
2143 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
2145 rc = llog_origin_handle_read_header(req);
2146 ldlm_callback_reply(req, rc);
2148 case LLOG_ORIGIN_HANDLE_CLOSE:
2149 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
2151 rc = llog_origin_handle_close(req);
2152 ldlm_callback_reply(req, rc);
2154 case OBD_QC_CALLBACK:
2155 req_capsule_set(&req->rq_pill, &RQF_QC_CALLBACK);
2156 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_QC_CALLBACK_NET))
2158 rc = ldlm_handle_qc_callback(req);
2159 ldlm_callback_reply(req, rc);
2162 CERROR("unknown opcode %u\n",
2163 lustre_msg_get_opc(req->rq_reqmsg));
2164 ldlm_callback_reply(req, -EPROTO);
2168 ns = req->rq_export->exp_obd->obd_namespace;
2169 LASSERT(ns != NULL);
2171 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2173 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2174 if (dlm_req == NULL) {
2175 rc = ldlm_callback_reply(req, -EPROTO);
2176 ldlm_callback_errmsg(req, "Operate without parameter", rc,
2181 /* Force a known safe race, send a cancel to the server for a lock
2182 * which the server has already started a blocking callback on. */
2183 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE) &&
2184 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
2185 rc = ldlm_cli_cancel(&dlm_req->lock_handle[0], 0);
2187 CERROR("ldlm_cli_cancel: %d\n", rc);
2190 lock = ldlm_handle2lock_long(&dlm_req->lock_handle[0], 0);
2192 CDEBUG(D_DLMTRACE, "callback on lock "LPX64" - lock "
2193 "disappeared\n", dlm_req->lock_handle[0].cookie);
2194 rc = ldlm_callback_reply(req, -EINVAL);
2195 ldlm_callback_errmsg(req, "Operate with invalid parameter", rc,
2196 &dlm_req->lock_handle[0]);
2200 if (ldlm_is_fail_loc(lock) &&
2201 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK)
2202 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
2204 /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
2205 lock_res_and_lock(lock);
2206 lock->l_flags |= ldlm_flags_from_wire(dlm_req->lock_flags &
2208 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
2209 /* If somebody cancels lock and cache is already dropped,
2210 * or lock is failed before cp_ast received on client,
2211 * we can tell the server we have no lock. Otherwise, we
2212 * should send cancel after dropping the cache. */
2213 if ((ldlm_is_canceling(lock) && ldlm_is_bl_done(lock)) ||
2214 ldlm_is_failed(lock)) {
2215 LDLM_DEBUG(lock, "callback on lock "
2216 LPX64" - lock disappeared\n",
2217 dlm_req->lock_handle[0].cookie);
2218 unlock_res_and_lock(lock);
2219 LDLM_LOCK_RELEASE(lock);
2220 rc = ldlm_callback_reply(req, -EINVAL);
2221 ldlm_callback_errmsg(req, "Operate on stale lock", rc,
2222 &dlm_req->lock_handle[0]);
2225 /* BL_AST locks are not needed in LRU.
2226 * Let ldlm_cancel_lru() be fast. */
2227 ldlm_lock_remove_from_lru(lock);
2228 ldlm_set_bl_ast(lock);
2230 unlock_res_and_lock(lock);
2232 /* We want the ost thread to get this reply so that it can respond
2233 * to ost requests (write cache writeback) that might be triggered
2236 * But we'd also like to be able to indicate in the reply that we're
2237 * cancelling right now, because it's unused, or have an intent result
2238 * in the reply, so we might have to push the responsibility for sending
2239 * the reply down into the AST handlers, alas. */
2241 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2242 case LDLM_BL_CALLBACK:
2243 CDEBUG(D_INODE, "blocking ast\n");
2244 req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
2245 if (!ldlm_is_cancel_on_block(lock)) {
2246 rc = ldlm_callback_reply(req, 0);
2247 if (req->rq_no_reply || rc)
2248 ldlm_callback_errmsg(req, "Normal process", rc,
2249 &dlm_req->lock_handle[0]);
2251 if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
2252 ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
2254 case LDLM_CP_CALLBACK:
2255 CDEBUG(D_INODE, "completion ast\n");
2256 req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
2257 ldlm_callback_reply(req, 0);
2258 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
2260 case LDLM_GL_CALLBACK:
2261 CDEBUG(D_INODE, "glimpse ast\n");
2262 req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
2263 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
2266 LBUG(); /* checked above */
2272 #ifdef HAVE_SERVER_SUPPORT
2274 * Main handler for canceld thread.
2276 * Separated into its own thread to avoid deadlocks.
2278 static int ldlm_cancel_handler(struct ptlrpc_request *req)
2283 /* Requests arrive in sender's byte order. The ptlrpc service
2284 * handler has already checked and, if necessary, byte-swapped the
2285 * incoming request message body, but I am responsible for the
2286 * message buffers. */
2288 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2290 if (req->rq_export == NULL) {
2291 struct ldlm_request *dlm_req;
2293 CERROR("%s from %s arrived at %lu with bad export cookie "
2295 ll_opcode2str(lustre_msg_get_opc(req->rq_reqmsg)),
2296 libcfs_nid2str(req->rq_peer.nid),
2297 req->rq_arrival_time.tv_sec,
2298 lustre_msg_get_handle(req->rq_reqmsg)->cookie);
2300 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_CANCEL) {
2301 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2302 dlm_req = req_capsule_client_get(&req->rq_pill,
2304 if (dlm_req != NULL)
2305 ldlm_lock_dump_handle(D_ERROR,
2306 &dlm_req->lock_handle[0]);
2308 ldlm_callback_reply(req, -ENOTCONN);
2312 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2314 /* XXX FIXME move this back to mds/handler.c, bug 249 */
2316 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
2317 CDEBUG(D_INODE, "cancel\n");
2318 if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_NET) ||
2319 CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))
2321 rc = ldlm_handle_cancel(req);
2326 CERROR("invalid opcode %d\n",
2327 lustre_msg_get_opc(req->rq_reqmsg));
2328 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2329 ldlm_callback_reply(req, -EINVAL);
2335 static int ldlm_cancel_hpreq_lock_match(struct ptlrpc_request *req,
2336 struct ldlm_lock *lock)
2338 struct ldlm_request *dlm_req;
2339 struct lustre_handle lockh;
2344 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2345 if (dlm_req == NULL)
2348 ldlm_lock2handle(lock, &lockh);
2349 for (i = 0; i < dlm_req->lock_count; i++) {
2350 if (lustre_handle_equal(&dlm_req->lock_handle[i],
2352 DEBUG_REQ(D_RPCTRACE, req,
2353 "Prio raised by lock "LPX64".", lockh.cookie);
2364 static int ldlm_cancel_hpreq_check(struct ptlrpc_request *req)
2366 struct ldlm_request *dlm_req;
2371 /* no prolong in recovery */
2372 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
2375 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2376 if (dlm_req == NULL)
2379 for (i = 0; i < dlm_req->lock_count; i++) {
2380 struct ldlm_lock *lock;
2382 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
2386 rc = ldlm_is_ast_sent(lock) ? 1 : 0;
2388 LDLM_DEBUG(lock, "hpreq cancel lock");
2389 LDLM_LOCK_PUT(lock);
2398 static struct ptlrpc_hpreq_ops ldlm_cancel_hpreq_ops = {
2399 .hpreq_lock_match = ldlm_cancel_hpreq_lock_match,
2400 .hpreq_check = ldlm_cancel_hpreq_check,
2404 static int ldlm_hpreq_handler(struct ptlrpc_request *req)
2408 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2410 if (req->rq_export == NULL)
2413 if (LDLM_CANCEL == lustre_msg_get_opc(req->rq_reqmsg)) {
2414 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
2415 req->rq_ops = &ldlm_cancel_hpreq_ops;
2420 int ldlm_revoke_lock_cb(cfs_hash_t *hs, cfs_hash_bd_t *bd,
2421 cfs_hlist_node_t *hnode, void *data)
2424 cfs_list_t *rpc_list = data;
2425 struct ldlm_lock *lock = cfs_hash_object(hs, hnode);
2427 lock_res_and_lock(lock);
2429 if (lock->l_req_mode != lock->l_granted_mode) {
2430 unlock_res_and_lock(lock);
2434 LASSERT(lock->l_resource);
2435 if (lock->l_resource->lr_type != LDLM_IBITS &&
2436 lock->l_resource->lr_type != LDLM_PLAIN) {
2437 unlock_res_and_lock(lock);
2441 if (ldlm_is_ast_sent(lock)) {
2442 unlock_res_and_lock(lock);
2446 LASSERT(lock->l_blocking_ast);
2447 LASSERT(!lock->l_blocking_lock);
2449 ldlm_set_ast_sent(lock);
2450 if (lock->l_export && lock->l_export->exp_lock_hash) {
2451 /* NB: it's safe to call cfs_hash_del() even lock isn't
2452 * in exp_lock_hash. */
2453 /* In the function below, .hs_keycmp resolves to
2454 * ldlm_export_lock_keycmp() */
2455 /* coverity[overrun-buffer-val] */
2456 cfs_hash_del(lock->l_export->exp_lock_hash,
2457 &lock->l_remote_handle, &lock->l_exp_hash);
2460 cfs_list_add_tail(&lock->l_rk_ast, rpc_list);
2461 LDLM_LOCK_GET(lock);
2463 unlock_res_and_lock(lock);
2467 void ldlm_revoke_export_locks(struct obd_export *exp)
2469 cfs_list_t rpc_list;
2472 CFS_INIT_LIST_HEAD(&rpc_list);
2473 cfs_hash_for_each_empty(exp->exp_lock_hash,
2474 ldlm_revoke_lock_cb, &rpc_list);
2475 ldlm_run_ast_work(exp->exp_obd->obd_namespace, &rpc_list,
2476 LDLM_WORK_REVOKE_AST);
2480 EXPORT_SYMBOL(ldlm_revoke_export_locks);
2481 #endif /* HAVE_SERVER_SUPPORT */
2484 static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp)
2486 struct ldlm_bl_work_item *blwi = NULL;
2487 static unsigned int num_bl = 0;
2489 spin_lock(&blp->blp_lock);
2490 /* process a request from the blp_list at least every blp_num_threads */
2491 if (!cfs_list_empty(&blp->blp_list) &&
2492 (cfs_list_empty(&blp->blp_prio_list) || num_bl == 0))
2493 blwi = cfs_list_entry(blp->blp_list.next,
2494 struct ldlm_bl_work_item, blwi_entry);
2496 if (!cfs_list_empty(&blp->blp_prio_list))
2497 blwi = cfs_list_entry(blp->blp_prio_list.next,
2498 struct ldlm_bl_work_item,
2502 if (++num_bl >= atomic_read(&blp->blp_num_threads))
2504 cfs_list_del(&blwi->blwi_entry);
2506 spin_unlock(&blp->blp_lock);
2511 /* This only contains temporary data until the thread starts */
2512 struct ldlm_bl_thread_data {
2513 char bltd_name[CFS_CURPROC_COMM_MAX];
2514 struct ldlm_bl_pool *bltd_blp;
2515 struct completion bltd_comp;
2519 static int ldlm_bl_thread_main(void *arg);
2521 static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp)
2523 struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
2524 struct task_struct *task;
2526 init_completion(&bltd.bltd_comp);
2527 bltd.bltd_num = atomic_read(&blp->blp_num_threads);
2528 snprintf(bltd.bltd_name, sizeof(bltd.bltd_name) - 1,
2529 "ldlm_bl_%02d", bltd.bltd_num);
2530 task = kthread_run(ldlm_bl_thread_main, &bltd, bltd.bltd_name);
2532 CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %ld\n",
2533 atomic_read(&blp->blp_num_threads), PTR_ERR(task));
2534 return PTR_ERR(task);
2536 wait_for_completion(&bltd.bltd_comp);
2542 * Main blocking requests processing thread.
2544 * Callers put locks into its queue by calling ldlm_bl_to_thread.
2545 * This thread in the end ends up doing actual call to ->l_blocking_ast
2548 static int ldlm_bl_thread_main(void *arg)
2550 struct ldlm_bl_pool *blp;
2551 struct ldlm_bl_thread_data *bltd = arg;
2554 blp = bltd->bltd_blp;
2556 atomic_inc(&blp->blp_num_threads);
2557 atomic_inc(&blp->blp_busy_threads);
2559 complete(&bltd->bltd_comp);
2560 /* cannot use bltd after this, it is only on caller's stack */
2563 struct l_wait_info lwi = { 0 };
2564 struct ldlm_bl_work_item *blwi = NULL;
2567 blwi = ldlm_bl_get_work(blp);
2570 atomic_dec(&blp->blp_busy_threads);
2571 l_wait_event_exclusive(blp->blp_waitq,
2572 (blwi = ldlm_bl_get_work(blp)) != NULL,
2574 busy = atomic_inc_return(&blp->blp_busy_threads);
2576 busy = atomic_read(&blp->blp_busy_threads);
2579 if (blwi->blwi_ns == NULL)
2580 /* added by ldlm_cleanup() */
2583 /* Not fatal if racy and have a few too many threads */
2584 if (unlikely(busy < blp->blp_max_threads &&
2585 busy >= atomic_read(&blp->blp_num_threads) &&
2586 !blwi->blwi_mem_pressure))
2587 /* discard the return value, we tried */
2588 ldlm_bl_thread_start(blp);
2590 if (blwi->blwi_mem_pressure)
2591 memory_pressure_set();
2593 if (blwi->blwi_count) {
2595 /* The special case when we cancel locks in LRU
2596 * asynchronously, we pass the list of locks here.
2597 * Thus locks are marked LDLM_FL_CANCELING, but NOT
2598 * canceled locally yet. */
2599 count = ldlm_cli_cancel_list_local(&blwi->blwi_head,
2602 ldlm_cli_cancel_list(&blwi->blwi_head, count, NULL,
2605 ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
2608 if (blwi->blwi_mem_pressure)
2609 memory_pressure_clr();
2611 if (blwi->blwi_flags & LCF_ASYNC)
2612 OBD_FREE(blwi, sizeof(*blwi));
2614 complete(&blwi->blwi_comp);
2617 atomic_dec(&blp->blp_busy_threads);
2618 atomic_dec(&blp->blp_num_threads);
2619 complete(&blp->blp_comp);
2625 static int ldlm_setup(void);
2626 static int ldlm_cleanup(void);
2628 int ldlm_get_ref(void)
2632 mutex_lock(&ldlm_ref_mutex);
2633 if (++ldlm_refcount == 1) {
2638 mutex_unlock(&ldlm_ref_mutex);
2642 EXPORT_SYMBOL(ldlm_get_ref);
2644 void ldlm_put_ref(void)
2647 mutex_lock(&ldlm_ref_mutex);
2648 if (ldlm_refcount == 1) {
2649 int rc = ldlm_cleanup();
2651 CERROR("ldlm_cleanup failed: %d\n", rc);
2657 mutex_unlock(&ldlm_ref_mutex);
2661 EXPORT_SYMBOL(ldlm_put_ref);
2664 * Export handle<->lock hash operations.
2667 ldlm_export_lock_hash(cfs_hash_t *hs, const void *key, unsigned mask)
2669 return cfs_hash_u64_hash(((struct lustre_handle *)key)->cookie, mask);
2673 ldlm_export_lock_key(cfs_hlist_node_t *hnode)
2675 struct ldlm_lock *lock;
2677 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2678 return &lock->l_remote_handle;
2682 ldlm_export_lock_keycpy(cfs_hlist_node_t *hnode, void *key)
2684 struct ldlm_lock *lock;
2686 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2687 lock->l_remote_handle = *(struct lustre_handle *)key;
2691 ldlm_export_lock_keycmp(const void *key, cfs_hlist_node_t *hnode)
2693 return lustre_handle_equal(ldlm_export_lock_key(hnode), key);
2697 ldlm_export_lock_object(cfs_hlist_node_t *hnode)
2699 return cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2703 ldlm_export_lock_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
2705 struct ldlm_lock *lock;
2707 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2708 LDLM_LOCK_GET(lock);
2712 ldlm_export_lock_put(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
2714 struct ldlm_lock *lock;
2716 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2717 LDLM_LOCK_RELEASE(lock);
2720 static cfs_hash_ops_t ldlm_export_lock_ops = {
2721 .hs_hash = ldlm_export_lock_hash,
2722 .hs_key = ldlm_export_lock_key,
2723 .hs_keycmp = ldlm_export_lock_keycmp,
2724 .hs_keycpy = ldlm_export_lock_keycpy,
2725 .hs_object = ldlm_export_lock_object,
2726 .hs_get = ldlm_export_lock_get,
2727 .hs_put = ldlm_export_lock_put,
2728 .hs_put_locked = ldlm_export_lock_put,
2731 int ldlm_init_export(struct obd_export *exp)
2736 exp->exp_lock_hash =
2737 cfs_hash_create(obd_uuid2str(&exp->exp_client_uuid),
2738 HASH_EXP_LOCK_CUR_BITS,
2739 HASH_EXP_LOCK_MAX_BITS,
2740 HASH_EXP_LOCK_BKT_BITS, 0,
2741 CFS_HASH_MIN_THETA, CFS_HASH_MAX_THETA,
2742 &ldlm_export_lock_ops,
2743 CFS_HASH_DEFAULT | CFS_HASH_REHASH_KEY |
2744 CFS_HASH_NBLK_CHANGE);
2746 if (!exp->exp_lock_hash)
2749 rc = ldlm_init_flock_export(exp);
2755 ldlm_destroy_export(exp);
2758 EXPORT_SYMBOL(ldlm_init_export);
2760 void ldlm_destroy_export(struct obd_export *exp)
2763 cfs_hash_putref(exp->exp_lock_hash);
2764 exp->exp_lock_hash = NULL;
2766 ldlm_destroy_flock_export(exp);
2769 EXPORT_SYMBOL(ldlm_destroy_export);
2771 static int ldlm_setup(void)
2773 static struct ptlrpc_service_conf conf;
2774 struct ldlm_bl_pool *blp = NULL;
2776 # ifdef HAVE_SERVER_SUPPORT
2777 struct task_struct *task;
2785 if (ldlm_state != NULL)
2788 OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
2789 if (ldlm_state == NULL)
2793 rc = ldlm_proc_setup();
2798 memset(&conf, 0, sizeof(conf));
2799 conf = (typeof(conf)) {
2800 .psc_name = "ldlm_cbd",
2801 .psc_watchdog_factor = 2,
2803 .bc_nbufs = LDLM_CLIENT_NBUFS,
2804 .bc_buf_size = LDLM_BUFSIZE,
2805 .bc_req_max_size = LDLM_MAXREQSIZE,
2806 .bc_rep_max_size = LDLM_MAXREPSIZE,
2807 .bc_req_portal = LDLM_CB_REQUEST_PORTAL,
2808 .bc_rep_portal = LDLM_CB_REPLY_PORTAL,
2811 .tc_thr_name = "ldlm_cb",
2812 .tc_thr_factor = LDLM_THR_FACTOR,
2813 .tc_nthrs_init = LDLM_NTHRS_INIT,
2814 .tc_nthrs_base = LDLM_NTHRS_BASE,
2815 .tc_nthrs_max = LDLM_NTHRS_MAX,
2816 .tc_nthrs_user = ldlm_num_threads,
2817 .tc_cpu_affinity = 1,
2818 .tc_ctx_tags = LCT_MD_THREAD | LCT_DT_THREAD,
2821 .cc_pattern = ldlm_cpts,
2824 .so_req_handler = ldlm_callback_handler,
2827 ldlm_state->ldlm_cb_service = \
2828 ptlrpc_register_service(&conf, ldlm_svc_proc_dir);
2829 if (IS_ERR(ldlm_state->ldlm_cb_service)) {
2830 CERROR("failed to start service\n");
2831 rc = PTR_ERR(ldlm_state->ldlm_cb_service);
2832 ldlm_state->ldlm_cb_service = NULL;
2836 #ifdef HAVE_SERVER_SUPPORT
2837 memset(&conf, 0, sizeof(conf));
2838 conf = (typeof(conf)) {
2839 .psc_name = "ldlm_canceld",
2840 .psc_watchdog_factor = 6,
2842 .bc_nbufs = LDLM_SERVER_NBUFS,
2843 .bc_buf_size = LDLM_BUFSIZE,
2844 .bc_req_max_size = LDLM_MAXREQSIZE,
2845 .bc_rep_max_size = LDLM_MAXREPSIZE,
2846 .bc_req_portal = LDLM_CANCEL_REQUEST_PORTAL,
2847 .bc_rep_portal = LDLM_CANCEL_REPLY_PORTAL,
2851 .tc_thr_name = "ldlm_cn",
2852 .tc_thr_factor = LDLM_THR_FACTOR,
2853 .tc_nthrs_init = LDLM_NTHRS_INIT,
2854 .tc_nthrs_base = LDLM_NTHRS_BASE,
2855 .tc_nthrs_max = LDLM_NTHRS_MAX,
2856 .tc_nthrs_user = ldlm_num_threads,
2857 .tc_cpu_affinity = 1,
2858 .tc_ctx_tags = LCT_MD_THREAD | \
2863 .cc_pattern = ldlm_cpts,
2866 .so_req_handler = ldlm_cancel_handler,
2867 .so_hpreq_handler = ldlm_hpreq_handler,
2870 ldlm_state->ldlm_cancel_service = \
2871 ptlrpc_register_service(&conf, ldlm_svc_proc_dir);
2872 if (IS_ERR(ldlm_state->ldlm_cancel_service)) {
2873 CERROR("failed to start service\n");
2874 rc = PTR_ERR(ldlm_state->ldlm_cancel_service);
2875 ldlm_state->ldlm_cancel_service = NULL;
2880 OBD_ALLOC(blp, sizeof(*blp));
2882 GOTO(out, rc = -ENOMEM);
2883 ldlm_state->ldlm_bl_pool = blp;
2885 spin_lock_init(&blp->blp_lock);
2886 CFS_INIT_LIST_HEAD(&blp->blp_list);
2887 CFS_INIT_LIST_HEAD(&blp->blp_prio_list);
2888 init_waitqueue_head(&blp->blp_waitq);
2889 atomic_set(&blp->blp_num_threads, 0);
2890 atomic_set(&blp->blp_busy_threads, 0);
2893 if (ldlm_num_threads == 0) {
2894 blp->blp_min_threads = LDLM_NTHRS_INIT;
2895 blp->blp_max_threads = LDLM_NTHRS_MAX;
2897 blp->blp_min_threads = blp->blp_max_threads = \
2898 min_t(int, LDLM_NTHRS_MAX, max_t(int, LDLM_NTHRS_INIT,
2902 for (i = 0; i < blp->blp_min_threads; i++) {
2903 rc = ldlm_bl_thread_start(blp);
2908 # ifdef HAVE_SERVER_SUPPORT
2909 CFS_INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
2910 expired_lock_thread.elt_state = ELT_STOPPED;
2911 init_waitqueue_head(&expired_lock_thread.elt_waitq);
2913 CFS_INIT_LIST_HEAD(&waiting_locks_list);
2914 spin_lock_init(&waiting_locks_spinlock);
2915 cfs_timer_init(&waiting_locks_timer, waiting_locks_callback, 0);
2917 task = kthread_run(expired_lock_main, NULL, "ldlm_elt");
2920 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
2924 wait_event(expired_lock_thread.elt_waitq,
2925 expired_lock_thread.elt_state == ELT_READY);
2926 # endif /* HAVE_SERVER_SUPPORT */
2928 rc = ldlm_pools_init();
2930 CERROR("Failed to initialize LDLM pools: %d\n", rc);
2941 static int ldlm_cleanup(void)
2945 if (!cfs_list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) ||
2946 !cfs_list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) {
2947 CERROR("ldlm still has namespaces; clean these up first.\n");
2948 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
2949 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
2956 if (ldlm_state->ldlm_bl_pool != NULL) {
2957 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
2959 while (atomic_read(&blp->blp_num_threads) > 0) {
2960 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
2962 init_completion(&blp->blp_comp);
2964 spin_lock(&blp->blp_lock);
2965 cfs_list_add_tail(&blwi.blwi_entry, &blp->blp_list);
2966 wake_up(&blp->blp_waitq);
2967 spin_unlock(&blp->blp_lock);
2969 wait_for_completion(&blp->blp_comp);
2972 OBD_FREE(blp, sizeof(*blp));
2974 #endif /* __KERNEL__ */
2976 if (ldlm_state->ldlm_cb_service != NULL)
2977 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2978 # ifdef HAVE_SERVER_SUPPORT
2979 if (ldlm_state->ldlm_cancel_service != NULL)
2980 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2984 ldlm_proc_cleanup();
2986 # ifdef HAVE_SERVER_SUPPORT
2987 if (expired_lock_thread.elt_state != ELT_STOPPED) {
2988 expired_lock_thread.elt_state = ELT_TERMINATE;
2989 wake_up(&expired_lock_thread.elt_waitq);
2990 wait_event(expired_lock_thread.elt_waitq,
2991 expired_lock_thread.elt_state == ELT_STOPPED);
2994 #endif /* __KERNEL__ */
2996 OBD_FREE(ldlm_state, sizeof(*ldlm_state));
3004 mutex_init(&ldlm_ref_mutex);
3005 mutex_init(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER));
3006 mutex_init(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
3007 ldlm_resource_slab = kmem_cache_create("ldlm_resources",
3008 sizeof(struct ldlm_resource), 0,
3009 SLAB_HWCACHE_ALIGN, NULL);
3010 if (ldlm_resource_slab == NULL)
3013 ldlm_lock_slab = kmem_cache_create("ldlm_locks",
3014 sizeof(struct ldlm_lock), 0,
3015 SLAB_HWCACHE_ALIGN | SLAB_DESTROY_BY_RCU, NULL);
3016 if (ldlm_lock_slab == NULL) {
3017 kmem_cache_destroy(ldlm_resource_slab);
3021 ldlm_interval_slab = kmem_cache_create("interval_node",
3022 sizeof(struct ldlm_interval),
3023 0, SLAB_HWCACHE_ALIGN, NULL);
3024 if (ldlm_interval_slab == NULL) {
3025 kmem_cache_destroy(ldlm_resource_slab);
3026 kmem_cache_destroy(ldlm_lock_slab);
3029 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3030 class_export_dump_hook = ldlm_dump_export_locks;
3035 void ldlm_exit(void)
3038 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
3039 kmem_cache_destroy(ldlm_resource_slab);
3041 /* ldlm_lock_put() use RCU to call ldlm_lock_free, so need call
3042 * synchronize_rcu() to wait a grace period elapsed, so that
3043 * ldlm_lock_free() get a chance to be called. */
3046 kmem_cache_destroy(ldlm_lock_slab);
3047 kmem_cache_destroy(ldlm_interval_slab);