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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2010, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/ldlm/ldlm_lockd.c
34 * Author: Peter Braam <braam@clusterfs.com>
35 * Author: Phil Schwan <phil@clusterfs.com>
38 #define DEBUG_SUBSYSTEM S_LDLM
40 #include <linux/kthread.h>
41 #include <linux/list.h>
42 #include <libcfs/libcfs.h>
43 #include <lustre_errno.h>
44 #include <lustre_dlm.h>
45 #include <obd_class.h>
46 #include "ldlm_internal.h"
48 static int ldlm_num_threads;
49 module_param(ldlm_num_threads, int, 0444);
50 MODULE_PARM_DESC(ldlm_num_threads, "number of DLM service threads to start");
52 static char *ldlm_cpts;
53 module_param(ldlm_cpts, charp, 0444);
54 MODULE_PARM_DESC(ldlm_cpts, "CPU partitions ldlm threads should run on");
56 static DEFINE_MUTEX(ldlm_ref_mutex);
57 static int ldlm_refcount;
59 struct kobject *ldlm_kobj;
60 struct kset *ldlm_ns_kset;
61 struct kset *ldlm_svc_kset;
65 static struct ldlm_state *ldlm_state;
67 /* timeout for initial callback (AST) reply (bz10399)
68 * Due to having to send a 32 bit time value over the
69 * wire return it as time_t instead of time64_t
71 static inline time_t ldlm_get_rq_timeout(void)
74 time_t timeout = min(ldlm_timeout, obd_timeout / 3);
76 return timeout < 1 ? 1 : timeout;
83 * blp_prio_list is used for callbacks that should be handled
84 * as a priority. It is used for LDLM_FL_DISCARD_DATA requests.
87 struct list_head blp_prio_list;
90 * blp_list is used for all other callbacks which are likely
91 * to take longer to process.
93 struct list_head blp_list;
95 wait_queue_head_t blp_waitq;
96 struct completion blp_comp;
97 atomic_t blp_num_threads;
98 atomic_t blp_busy_threads;
103 struct ldlm_bl_work_item {
104 struct list_head blwi_entry;
105 struct ldlm_namespace *blwi_ns;
106 struct ldlm_lock_desc blwi_ld;
107 struct ldlm_lock *blwi_lock;
108 struct list_head blwi_head;
110 struct completion blwi_comp;
111 enum ldlm_cancel_flags blwi_flags;
112 int blwi_mem_pressure;
115 #ifdef HAVE_SERVER_SUPPORT
118 * Protects both waiting_locks_list and expired_lock_thread.
120 static DEFINE_SPINLOCK(waiting_locks_spinlock); /* BH lock (timer) */
123 * List for contended locks.
125 * As soon as a lock is contended, it gets placed on this list and
126 * expected time to get a response is filled in the lock. A special
127 * thread walks the list looking for locks that should be released and
128 * schedules client evictions for those that have not been released in
131 * All access to it should be under waiting_locks_spinlock.
133 static LIST_HEAD(waiting_locks_list);
134 static void waiting_locks_callback(TIMER_DATA_TYPE unused);
135 static CFS_DEFINE_TIMER(waiting_locks_timer, waiting_locks_callback, 0, 0);
143 static DECLARE_WAIT_QUEUE_HEAD(expired_lock_wait_queue);
144 static enum elt_state expired_lock_thread_state = ELT_STOPPED;
145 static int expired_lock_dump;
146 static LIST_HEAD(expired_lock_list);
148 static int ldlm_lock_busy(struct ldlm_lock *lock);
149 static int ldlm_add_waiting_lock(struct ldlm_lock *lock, time64_t timeout);
150 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, time64_t seconds);
152 static inline int have_expired_locks(void)
157 spin_lock_bh(&waiting_locks_spinlock);
158 need_to_run = !list_empty(&expired_lock_list);
159 spin_unlock_bh(&waiting_locks_spinlock);
165 * Check expired lock list for expired locks and time them out.
167 static int expired_lock_main(void *arg)
169 struct list_head *expired = &expired_lock_list;
170 struct l_wait_info lwi = { 0 };
175 expired_lock_thread_state = ELT_READY;
176 wake_up(&expired_lock_wait_queue);
179 l_wait_event(expired_lock_wait_queue,
180 have_expired_locks() ||
181 expired_lock_thread_state == ELT_TERMINATE,
184 spin_lock_bh(&waiting_locks_spinlock);
185 if (expired_lock_dump) {
186 spin_unlock_bh(&waiting_locks_spinlock);
188 /* from waiting_locks_callback, but not in timer */
189 libcfs_debug_dumplog();
191 spin_lock_bh(&waiting_locks_spinlock);
192 expired_lock_dump = 0;
197 while (!list_empty(expired)) {
198 struct obd_export *export;
199 struct ldlm_lock *lock;
201 lock = list_entry(expired->next, struct ldlm_lock,
203 if ((void *)lock < LP_POISON + PAGE_SIZE &&
204 (void *)lock >= LP_POISON) {
205 spin_unlock_bh(&waiting_locks_spinlock);
206 CERROR("free lock on elt list %p\n", lock);
209 list_del_init(&lock->l_pending_chain);
210 if ((void *)lock->l_export <
211 LP_POISON + PAGE_SIZE &&
212 (void *)lock->l_export >= LP_POISON) {
213 CERROR("lock with free export on elt list %p\n",
215 lock->l_export = NULL;
216 LDLM_ERROR(lock, "free export");
217 /* release extra ref grabbed by
218 * ldlm_add_waiting_lock() or
219 * ldlm_failed_ast() */
220 LDLM_LOCK_RELEASE(lock);
224 if (ldlm_is_destroyed(lock)) {
225 /* release the lock refcount where
226 * waiting_locks_callback() founds */
227 LDLM_LOCK_RELEASE(lock);
230 export = class_export_lock_get(lock->l_export, lock);
231 spin_unlock_bh(&waiting_locks_spinlock);
233 /* Check if we need to prolong timeout */
234 if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT) &&
235 lock->l_callback_timeout != 0 && /* not AST error */
236 ldlm_lock_busy(lock)) {
237 LDLM_DEBUG(lock, "prolong the busy lock");
238 lock_res_and_lock(lock);
239 ldlm_add_waiting_lock(lock,
240 ldlm_bl_timeout(lock) >> 1);
241 unlock_res_and_lock(lock);
243 spin_lock_bh(&export->exp_bl_list_lock);
244 list_del_init(&lock->l_exp_list);
245 spin_unlock_bh(&export->exp_bl_list_lock);
248 "lock callback timer expired after %llds: evicting client at %s ",
249 ktime_get_real_seconds() -
251 obd_export_nid2str(export));
252 ldlm_lock_to_ns(lock)->ns_timeouts++;
254 class_fail_export(export);
256 class_export_lock_put(export, lock);
257 /* release extra ref grabbed by ldlm_add_waiting_lock()
258 * or ldlm_failed_ast() */
259 LDLM_LOCK_RELEASE(lock);
261 spin_lock_bh(&waiting_locks_spinlock);
263 spin_unlock_bh(&waiting_locks_spinlock);
265 if (do_dump && obd_dump_on_eviction) {
266 CERROR("dump the log upon eviction\n");
267 libcfs_debug_dumplog();
270 if (expired_lock_thread_state == ELT_TERMINATE)
274 expired_lock_thread_state = ELT_STOPPED;
275 wake_up(&expired_lock_wait_queue);
280 * Check if there is a request in the export request list
281 * which prevents the lock canceling.
283 static int ldlm_lock_busy(struct ldlm_lock *lock)
285 struct ptlrpc_request *req;
289 if (lock->l_export == NULL)
292 spin_lock(&lock->l_export->exp_rpc_lock);
293 list_for_each_entry(req, &lock->l_export->exp_hp_rpcs,
295 if (req->rq_ops->hpreq_lock_match) {
296 match = req->rq_ops->hpreq_lock_match(req, lock);
301 spin_unlock(&lock->l_export->exp_rpc_lock);
305 /* This is called from within a timer interrupt and cannot schedule */
306 static void waiting_locks_callback(TIMER_DATA_TYPE unused)
308 struct ldlm_lock *lock;
311 spin_lock_bh(&waiting_locks_spinlock);
312 while (!list_empty(&waiting_locks_list)) {
313 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
315 if (lock->l_callback_timeout > ktime_get_seconds() ||
316 lock->l_req_mode == LCK_GROUP)
319 /* no needs to take an extra ref on the lock since it was in
320 * the waiting_locks_list and ldlm_add_waiting_lock()
321 * already grabbed a ref */
322 list_del(&lock->l_pending_chain);
323 list_add(&lock->l_pending_chain, &expired_lock_list);
327 if (!list_empty(&expired_lock_list)) {
328 if (obd_dump_on_timeout && need_dump)
329 expired_lock_dump = __LINE__;
331 wake_up(&expired_lock_wait_queue);
335 * Make sure the timer will fire again if we have any locks
338 if (!list_empty(&waiting_locks_list)) {
339 unsigned long timeout_jiffies;
341 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
343 timeout_jiffies = cfs_time_seconds(lock->l_callback_timeout);
344 mod_timer(&waiting_locks_timer, timeout_jiffies);
346 spin_unlock_bh(&waiting_locks_spinlock);
350 * Add lock to the list of contended locks.
352 * Indicate that we're waiting for a client to call us back cancelling a given
353 * lock. We add it to the pending-callback chain, and schedule the lock-timeout
354 * timer to fire appropriately. (We round up to the next second, to avoid
355 * floods of timer firings during periods of high lock contention and traffic).
356 * As done by ldlm_add_waiting_lock(), the caller must grab a lock reference
357 * if it has been added to the waiting list (1 is returned).
359 * Called with the namespace lock held.
361 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, time64_t seconds)
363 unsigned long timeout_jiffies;
366 if (!list_empty(&lock->l_pending_chain))
369 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT) ||
370 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
373 timeout = ktime_get_seconds() + seconds;
374 if (likely(timeout > lock->l_callback_timeout))
375 lock->l_callback_timeout = timeout;
377 timeout_jiffies = cfs_time_seconds(lock->l_callback_timeout);
379 if (time_before(timeout_jiffies, waiting_locks_timer.expires) ||
380 !timer_pending(&waiting_locks_timer))
381 mod_timer(&waiting_locks_timer, timeout_jiffies);
383 /* if the new lock has a shorter timeout than something earlier on
384 * the list, we'll wait the longer amount of time; no big deal.
387 list_add_tail(&lock->l_pending_chain, &waiting_locks_list);
391 static void ldlm_add_blocked_lock(struct ldlm_lock *lock)
393 spin_lock_bh(&lock->l_export->exp_bl_list_lock);
394 if (list_empty(&lock->l_exp_list)) {
395 if (lock->l_granted_mode != lock->l_req_mode)
396 list_add_tail(&lock->l_exp_list,
397 &lock->l_export->exp_bl_list);
399 list_add(&lock->l_exp_list,
400 &lock->l_export->exp_bl_list);
402 spin_unlock_bh(&lock->l_export->exp_bl_list_lock);
404 /* A blocked lock is added. Adjust the position in
405 * the stale list if the export is in the list.
406 * If export is stale and not in the list - it is being
407 * processed and will be placed on the right position
408 * on obd_stale_export_put(). */
409 if (!list_empty(&lock->l_export->exp_stale_list))
410 obd_stale_export_adjust(lock->l_export);
413 static int ldlm_add_waiting_lock(struct ldlm_lock *lock, time64_t timeout)
417 /* NB: must be called with hold of lock_res_and_lock() */
418 LASSERT(ldlm_is_res_locked(lock));
419 LASSERT(!ldlm_is_cancel_on_block(lock));
421 /* Do not put cross-MDT lock in the waiting list, since we
422 * will not evict it due to timeout for now */
423 if (lock->l_export != NULL &&
424 (exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS))
427 spin_lock_bh(&waiting_locks_spinlock);
428 if (ldlm_is_cancel(lock)) {
429 spin_unlock_bh(&waiting_locks_spinlock);
433 if (ldlm_is_destroyed(lock)) {
434 static time64_t next;
436 spin_unlock_bh(&waiting_locks_spinlock);
437 LDLM_ERROR(lock, "not waiting on destroyed lock (bug 5653)");
438 if (ktime_get_seconds() > next) {
439 next = ktime_get_seconds() + 14400;
440 libcfs_debug_dumpstack(NULL);
445 ldlm_set_waited(lock);
446 lock->l_blast_sent = ktime_get_real_seconds();
447 ret = __ldlm_add_waiting_lock(lock, timeout);
449 /* grab ref on the lock if it has been added to the
453 spin_unlock_bh(&waiting_locks_spinlock);
456 ldlm_add_blocked_lock(lock);
458 LDLM_DEBUG(lock, "%sadding to wait list(timeout: %lld, AT: %s)",
459 ret == 0 ? "not re-" : "", timeout,
460 AT_OFF ? "off" : "on");
465 * Remove a lock from the pending list, likely because it had its cancellation
466 * callback arrive without incident. This adjusts the lock-timeout timer if
467 * needed. Returns 0 if the lock wasn't pending after all, 1 if it was.
468 * As done by ldlm_del_waiting_lock(), the caller must release the lock
469 * reference when the lock is removed from any list (1 is returned).
471 * Called with namespace lock held.
473 static int __ldlm_del_waiting_lock(struct ldlm_lock *lock)
475 struct list_head *list_next;
477 if (list_empty(&lock->l_pending_chain))
480 list_next = lock->l_pending_chain.next;
481 if (lock->l_pending_chain.prev == &waiting_locks_list) {
482 /* Removing the head of the list, adjust timer. */
483 if (list_next == &waiting_locks_list) {
484 /* No more, just cancel. */
485 del_timer(&waiting_locks_timer);
487 struct ldlm_lock *next;
489 next = list_entry(list_next, struct ldlm_lock,
491 mod_timer(&waiting_locks_timer,
492 cfs_time_seconds(next->l_callback_timeout));
495 list_del_init(&lock->l_pending_chain);
500 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
504 if (lock->l_export == NULL) {
505 /* We don't have a "waiting locks list" on clients. */
506 CDEBUG(D_DLMTRACE, "Client lock %p : no-op\n", lock);
510 spin_lock_bh(&waiting_locks_spinlock);
511 ret = __ldlm_del_waiting_lock(lock);
512 ldlm_clear_waited(lock);
513 spin_unlock_bh(&waiting_locks_spinlock);
515 /* remove the lock out of export blocking list */
516 spin_lock_bh(&lock->l_export->exp_bl_list_lock);
517 list_del_init(&lock->l_exp_list);
518 spin_unlock_bh(&lock->l_export->exp_bl_list_lock);
521 /* release lock ref if it has indeed been removed
523 LDLM_LOCK_RELEASE(lock);
526 LDLM_DEBUG(lock, "%s", ret == 0 ? "wasn't waiting" : "removed");
531 * Prolong the contended lock waiting time.
533 * Called with namespace lock held.
535 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, time64_t timeout)
537 if (lock->l_export == NULL) {
538 /* We don't have a "waiting locks list" on clients. */
539 LDLM_DEBUG(lock, "client lock: no-op");
543 if (exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS) {
544 /* We don't have a "waiting locks list" on OSP. */
545 LDLM_DEBUG(lock, "MDS-MDS lock: no-op");
549 spin_lock_bh(&waiting_locks_spinlock);
551 if (list_empty(&lock->l_pending_chain)) {
552 spin_unlock_bh(&waiting_locks_spinlock);
553 LDLM_DEBUG(lock, "wasn't waiting");
557 /* we remove/add the lock to the waiting list, so no needs to
558 * release/take a lock reference */
559 __ldlm_del_waiting_lock(lock);
560 __ldlm_add_waiting_lock(lock, timeout);
561 spin_unlock_bh(&waiting_locks_spinlock);
563 LDLM_DEBUG(lock, "refreshed");
566 EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
568 #else /* HAVE_SERVER_SUPPORT */
570 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
575 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, time64_t timeout)
580 #endif /* !HAVE_SERVER_SUPPORT */
582 #ifdef HAVE_SERVER_SUPPORT
585 * Calculate the per-export Blocking timeout (covering BL AST, data flush,
586 * lock cancel, and their replies). Used for lock callback timeout and AST
589 * \param[in] lock lock which is getting the blocking callback
591 * \retval timeout in seconds to wait for the client reply
593 time64_t ldlm_bl_timeout(struct ldlm_lock *lock)
598 return obd_timeout / 2;
600 /* Since these are non-updating timeouts, we should be conservative.
601 * Take more than usually, 150%
602 * It would be nice to have some kind of "early reply" mechanism for
603 * lock callbacks too... */
604 timeout = at_get(&lock->l_export->exp_bl_lock_at);
605 return max(timeout + (timeout >> 1), (time64_t)ldlm_enqueue_min);
607 EXPORT_SYMBOL(ldlm_bl_timeout);
610 * Perform lock cleanup if AST sending failed.
612 static void ldlm_failed_ast(struct ldlm_lock *lock, int rc,
613 const char *ast_type)
615 LCONSOLE_ERROR_MSG(0x138, "%s: A client on nid %s was evicted due "
616 "to a lock %s callback time out: rc %d\n",
617 lock->l_export->exp_obd->obd_name,
618 obd_export_nid2str(lock->l_export), ast_type, rc);
620 if (obd_dump_on_timeout)
621 libcfs_debug_dumplog();
622 spin_lock_bh(&waiting_locks_spinlock);
623 if (__ldlm_del_waiting_lock(lock) == 0)
624 /* the lock was not in any list, grab an extra ref before adding
625 * the lock to the expired list */
627 lock->l_callback_timeout = 0; /* differentiate it from expired locks */
628 list_add(&lock->l_pending_chain, &expired_lock_list);
629 wake_up(&expired_lock_wait_queue);
630 spin_unlock_bh(&waiting_locks_spinlock);
634 * Perform lock cleanup if AST reply came with error.
636 static int ldlm_handle_ast_error(const struct lu_env *env,
637 struct ldlm_lock *lock,
638 struct ptlrpc_request *req, int rc,
639 const char *ast_type)
641 struct lnet_process_id peer = req->rq_import->imp_connection->c_peer;
643 if (!req->rq_replied || (rc && rc != -EINVAL)) {
644 if (ldlm_is_cancel(lock)) {
646 "%s AST (req@%p x%llu) timeout from nid %s, but cancel was received (AST reply lost?)",
647 ast_type, req, req->rq_xid,
648 libcfs_nid2str(peer.nid));
649 ldlm_lock_cancel(lock);
651 } else if (rc == -ENODEV || rc == -ESHUTDOWN ||
653 req->rq_import->imp_state == LUSTRE_IMP_CLOSED)) {
654 /* Upon umount process the AST fails because cannot be
655 * sent. This shouldn't lead to the client eviction.
656 * -ENODEV error is returned by ptl_send_rpc() for
657 * new request in such import.
658 * -SHUTDOWN is returned by ptlrpc_import_delay_req()
659 * if imp_invalid is set or obd_no_recov.
660 * Meanwhile there is also check for LUSTRE_IMP_CLOSED
661 * in ptlrpc_import_delay_req() as well with -EIO code.
662 * In all such cases errors are ignored.
664 LDLM_DEBUG(lock, "%s AST can't be sent due to a server"
665 " %s failure or umount process: rc = %d\n",
667 req->rq_import->imp_obd->obd_name, rc);
670 "client (nid %s) %s %s AST (req@%p x%llu status %d rc %d), evict it",
671 libcfs_nid2str(peer.nid),
672 req->rq_replied ? "returned error from" :
673 "failed to reply to",
674 ast_type, req, req->rq_xid,
675 (req->rq_repmsg != NULL) ?
676 lustre_msg_get_status(req->rq_repmsg) : 0,
678 ldlm_failed_ast(lock, rc, ast_type);
684 struct ldlm_resource *res = lock->l_resource;
687 "client (nid %s) returned %d from %s AST (req@%p x%llu) - normal race",
688 libcfs_nid2str(peer.nid),
690 lustre_msg_get_status(req->rq_repmsg) : -1,
691 ast_type, req, req->rq_xid);
693 /* update lvbo to return proper attributes.
695 ldlm_resource_getref(res);
696 ldlm_lvbo_update(env, res, lock, NULL, 1);
697 ldlm_resource_putref(res);
699 ldlm_lock_cancel(lock);
706 static int ldlm_cb_interpret(const struct lu_env *env,
707 struct ptlrpc_request *req, void *data, int rc)
709 struct ldlm_cb_async_args *ca = data;
710 struct ldlm_lock *lock = ca->ca_lock;
711 struct ldlm_cb_set_arg *arg = ca->ca_set_arg;
714 LASSERT(lock != NULL);
717 case LDLM_GL_CALLBACK:
718 /* Update the LVB from disk if the AST failed
719 * (this is a legal race)
721 * - Glimpse callback of local lock just returns
722 * -ELDLM_NO_LOCK_DATA.
723 * - Glimpse callback of remote lock might return
724 * -ELDLM_NO_LOCK_DATA when inode is cleared. LU-274
726 if (unlikely(arg->gl_interpret_reply)) {
727 rc = arg->gl_interpret_reply(env, req, data, rc);
728 } else if (rc == -ELDLM_NO_LOCK_DATA) {
729 LDLM_DEBUG(lock, "lost race - client has a lock but no "
731 ldlm_lvbo_update(env, lock->l_resource, lock, NULL, 1);
732 } else if (rc != 0) {
733 rc = ldlm_handle_ast_error(env, lock, req,
736 rc = ldlm_lvbo_update(env, lock->l_resource,
740 case LDLM_BL_CALLBACK:
742 rc = ldlm_handle_ast_error(env, lock, req,
745 case LDLM_CP_CALLBACK:
747 rc = ldlm_handle_ast_error(env, lock, req,
751 LDLM_ERROR(lock, "invalid opcode for lock callback %d",
756 /* release extra reference taken in ldlm_ast_fini() */
757 LDLM_LOCK_RELEASE(lock);
760 atomic_inc(&arg->restart);
765 static void ldlm_update_resend(struct ptlrpc_request *req, void *data)
767 struct ldlm_cb_async_args *ca = data;
768 struct ldlm_lock *lock = ca->ca_lock;
770 ldlm_refresh_waiting_lock(lock, ldlm_bl_timeout(lock));
773 static inline int ldlm_ast_fini(struct ptlrpc_request *req,
774 struct ldlm_cb_set_arg *arg,
775 struct ldlm_lock *lock,
781 if (unlikely(instant_cancel)) {
782 rc = ptl_send_rpc(req, 1);
783 ptlrpc_req_finished(req);
785 atomic_inc(&arg->restart);
788 ptlrpc_set_add_req(arg->set, req);
795 * Check if there are requests in the export request list which prevent
796 * the lock canceling and make these requests high priority ones.
798 static void ldlm_lock_reorder_req(struct ldlm_lock *lock)
800 struct ptlrpc_request *req;
803 if (lock->l_export == NULL) {
804 LDLM_DEBUG(lock, "client lock: no-op");
808 spin_lock(&lock->l_export->exp_rpc_lock);
809 list_for_each_entry(req, &lock->l_export->exp_hp_rpcs,
811 /* Do not process requests that were not yet added to there
812 * incoming queue or were already removed from there for
813 * processing. We evaluate ptlrpc_nrs_req_can_move() without
814 * holding svcpt->scp_req_lock, and then redo the check with
815 * the lock held once we need to obtain a reliable result.
817 if (ptlrpc_nrs_req_can_move(req) &&
818 req->rq_ops->hpreq_lock_match &&
819 req->rq_ops->hpreq_lock_match(req, lock))
820 ptlrpc_nrs_req_hp_move(req);
822 spin_unlock(&lock->l_export->exp_rpc_lock);
827 * ->l_blocking_ast() method for server-side locks. This is invoked when newly
828 * enqueued server lock conflicts with given one.
830 * Sends blocking AST RPC to the client owning that lock; arms timeout timer
831 * to wait for client response.
833 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
834 struct ldlm_lock_desc *desc,
835 void *data, int flag)
837 struct ldlm_cb_async_args *ca;
838 struct ldlm_cb_set_arg *arg = data;
839 struct ldlm_request *body;
840 struct ptlrpc_request *req;
841 int instant_cancel = 0;
845 if (flag == LDLM_CB_CANCELING)
846 /* Don't need to do anything here. */
849 if (OBD_FAIL_PRECHECK(OBD_FAIL_LDLM_SRV_BL_AST)) {
850 LDLM_DEBUG(lock, "dropping BL AST");
855 LASSERT(data != NULL);
856 if (lock->l_export->exp_obd->obd_recovering != 0)
857 LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
859 ldlm_lock_reorder_req(lock);
861 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
862 &RQF_LDLM_BL_CALLBACK,
863 LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK);
867 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
868 ca = ptlrpc_req_async_args(req);
869 ca->ca_set_arg = arg;
872 req->rq_interpret_reply = ldlm_cb_interpret;
874 lock_res_and_lock(lock);
875 if (ldlm_is_destroyed(lock)) {
876 /* What's the point? */
877 unlock_res_and_lock(lock);
878 ptlrpc_req_finished(req);
882 if (lock->l_granted_mode != lock->l_req_mode) {
883 /* this blocking AST will be communicated as part of the
884 * completion AST instead */
885 ldlm_add_blocked_lock(lock);
886 ldlm_set_waited(lock);
887 unlock_res_and_lock(lock);
889 ptlrpc_req_finished(req);
890 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
894 if (ldlm_is_cancel_on_block(lock))
897 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
898 body->lock_handle[0] = lock->l_remote_handle;
899 body->lock_desc = *desc;
900 body->lock_flags |= ldlm_flags_to_wire(lock->l_flags & LDLM_FL_AST_MASK);
902 LDLM_DEBUG(lock, "server preparing blocking AST");
904 ptlrpc_request_set_replen(req);
905 ldlm_set_cbpending(lock);
906 if (instant_cancel) {
907 unlock_res_and_lock(lock);
908 ldlm_lock_cancel(lock);
910 req->rq_no_resend = 1;
912 LASSERT(lock->l_granted_mode == lock->l_req_mode);
913 ldlm_add_waiting_lock(lock, ldlm_bl_timeout(lock));
914 unlock_res_and_lock(lock);
916 /* Do not resend after lock callback timeout */
917 req->rq_delay_limit = ldlm_bl_timeout(lock);
918 req->rq_resend_cb = ldlm_update_resend;
921 req->rq_send_state = LUSTRE_IMP_FULL;
922 /* ptlrpc_request_alloc_pack already set timeout */
924 req->rq_timeout = ldlm_get_rq_timeout();
926 if (lock->l_export && lock->l_export->exp_nid_stats &&
927 lock->l_export->exp_nid_stats->nid_ldlm_stats)
928 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
929 LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
931 rc = ldlm_ast_fini(req, arg, lock, instant_cancel);
937 * ->l_completion_ast callback for a remote lock in server namespace.
939 * Sends AST to the client notifying it of lock granting. If initial
940 * lock response was not sent yet, instead of sending another RPC, just
941 * mark the lock as granted and client will understand
943 int ldlm_server_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data)
945 struct ldlm_cb_set_arg *arg = data;
946 struct ldlm_request *body;
947 struct ptlrpc_request *req;
948 struct ldlm_cb_async_args *ca;
949 int instant_cancel = 0;
954 LASSERT(lock != NULL);
955 LASSERT(data != NULL);
957 if (OBD_FAIL_PRECHECK(OBD_FAIL_LDLM_SRV_CP_AST)) {
958 LDLM_DEBUG(lock, "dropping CP AST");
962 req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse,
963 &RQF_LDLM_CP_CALLBACK);
967 /* server namespace, doesn't need lock */
968 lvb_len = ldlm_lvbo_size(lock);
969 /* LU-3124 & LU-2187: to not return layout in completion AST because
970 * it may deadlock for LU-2187, or client may not have enough space
971 * for large layout. The layout will be returned to client with an
972 * extra RPC to fetch xattr.lov */
973 if (ldlm_has_layout(lock))
976 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT, lvb_len);
977 rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK);
979 ptlrpc_request_free(req);
983 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
984 ca = ptlrpc_req_async_args(req);
985 ca->ca_set_arg = arg;
988 req->rq_interpret_reply = ldlm_cb_interpret;
989 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
991 body->lock_handle[0] = lock->l_remote_handle;
992 body->lock_flags = ldlm_flags_to_wire(flags);
993 ldlm_lock2desc(lock, &body->lock_desc);
995 void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB);
996 const struct lu_env *env = NULL;
998 if (req->rq_svc_thread)
999 env = req->rq_svc_thread->t_env;
1001 lvb_len = ldlm_lvbo_fill(env, lock, lvb, lvb_len);
1003 /* We still need to send the RPC to wake up the blocked
1004 * enqueue thread on the client.
1006 * Consider old client, there is no better way to notify
1007 * the failure, just zero-sized the LVB, then the client
1008 * will fail out as "-EPROTO". */
1009 req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, 0,
1013 req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, lvb_len,
1018 LDLM_DEBUG(lock, "server preparing completion AST");
1020 ptlrpc_request_set_replen(req);
1022 req->rq_send_state = LUSTRE_IMP_FULL;
1023 /* ptlrpc_request_pack already set timeout */
1025 req->rq_timeout = ldlm_get_rq_timeout();
1027 /* We only send real blocking ASTs after the lock is granted */
1028 lock_res_and_lock(lock);
1029 if (ldlm_is_ast_sent(lock)) {
1030 body->lock_flags |= ldlm_flags_to_wire(LDLM_FL_AST_SENT);
1031 /* Copy AST flags like LDLM_FL_DISCARD_DATA. */
1032 body->lock_flags |= ldlm_flags_to_wire(lock->l_flags &
1035 /* We might get here prior to ldlm_handle_enqueue setting
1036 * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
1037 * into waiting list, but this is safe and similar code in
1038 * ldlm_handle_enqueue will call ldlm_lock_cancel() still,
1039 * that would not only cancel the lock, but will also remove
1040 * it from waiting list */
1041 if (ldlm_is_cancel_on_block(lock)) {
1042 unlock_res_and_lock(lock);
1043 ldlm_lock_cancel(lock);
1046 req->rq_no_resend = 1;
1048 lock_res_and_lock(lock);
1050 /* start the lock-timeout clock */
1051 ldlm_add_waiting_lock(lock, ldlm_bl_timeout(lock));
1052 /* Do not resend after lock callback timeout */
1053 req->rq_delay_limit = ldlm_bl_timeout(lock);
1054 req->rq_resend_cb = ldlm_update_resend;
1057 unlock_res_and_lock(lock);
1059 if (lock->l_export && lock->l_export->exp_nid_stats &&
1060 lock->l_export->exp_nid_stats->nid_ldlm_stats)
1061 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
1062 LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
1064 rc = ldlm_ast_fini(req, arg, lock, instant_cancel);
1066 RETURN(lvb_len < 0 ? lvb_len : rc);
1070 * Server side ->l_glimpse_ast handler for client locks.
1072 * Sends glimpse AST to the client and waits for reply. Then updates
1073 * lvbo with the result.
1075 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
1077 struct ldlm_cb_set_arg *arg = data;
1078 struct ldlm_request *body;
1079 struct ptlrpc_request *req;
1080 struct ldlm_cb_async_args *ca;
1082 struct req_format *req_fmt;
1085 LASSERT(lock != NULL);
1087 if (arg->gl_desc != NULL)
1088 /* There is a glimpse descriptor to pack */
1089 req_fmt = &RQF_LDLM_GL_CALLBACK_DESC;
1091 req_fmt = &RQF_LDLM_GL_CALLBACK;
1093 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
1094 req_fmt, LUSTRE_DLM_VERSION,
1100 if (arg->gl_desc != NULL) {
1101 /* copy the GL descriptor */
1102 union ldlm_gl_desc *desc;
1103 desc = req_capsule_client_get(&req->rq_pill, &RMF_DLM_GL_DESC);
1104 *desc = *arg->gl_desc;
1107 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1108 body->lock_handle[0] = lock->l_remote_handle;
1109 ldlm_lock2desc(lock, &body->lock_desc);
1111 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
1112 ca = ptlrpc_req_async_args(req);
1113 ca->ca_set_arg = arg;
1116 /* server namespace, doesn't need lock */
1117 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
1118 ldlm_lvbo_size(lock));
1119 ptlrpc_request_set_replen(req);
1121 req->rq_send_state = LUSTRE_IMP_FULL;
1122 /* ptlrpc_request_alloc_pack already set timeout */
1124 req->rq_timeout = ldlm_get_rq_timeout();
1126 req->rq_interpret_reply = ldlm_cb_interpret;
1128 if (lock->l_export && lock->l_export->exp_nid_stats &&
1129 lock->l_export->exp_nid_stats->nid_ldlm_stats)
1130 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
1131 LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
1133 rc = ldlm_ast_fini(req, arg, lock, 0);
1137 EXPORT_SYMBOL(ldlm_server_glimpse_ast);
1139 int ldlm_glimpse_locks(struct ldlm_resource *res,
1140 struct list_head *gl_work_list)
1145 rc = ldlm_run_ast_work(ldlm_res_to_ns(res), gl_work_list,
1147 if (rc == -ERESTART)
1148 ldlm_reprocess_all(res);
1152 EXPORT_SYMBOL(ldlm_glimpse_locks);
1154 /* return LDLM lock associated with a lock callback request */
1155 struct ldlm_lock *ldlm_request_lock(struct ptlrpc_request *req)
1157 struct ldlm_cb_async_args *ca;
1158 struct ldlm_lock *lock;
1161 ca = ptlrpc_req_async_args(req);
1164 RETURN(ERR_PTR(-EFAULT));
1168 EXPORT_SYMBOL(ldlm_request_lock);
1171 * Main server-side entry point into LDLM for enqueue. This is called by ptlrpc
1172 * service threads to carry out client lock enqueueing requests.
1174 int ldlm_handle_enqueue0(struct ldlm_namespace *ns,
1175 struct ptlrpc_request *req,
1176 const struct ldlm_request *dlm_req,
1177 const struct ldlm_callback_suite *cbs)
1179 struct ldlm_reply *dlm_rep;
1181 enum ldlm_error err = ELDLM_OK;
1182 struct ldlm_lock *lock = NULL;
1183 void *cookie = NULL;
1185 struct ldlm_resource *res = NULL;
1186 const struct lu_env *env = req->rq_svc_thread->t_env;
1189 LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
1191 ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF, LATF_SKIP);
1192 flags = ldlm_flags_from_wire(dlm_req->lock_flags);
1194 LASSERT(req->rq_export);
1196 /* for intent enqueue the stat will be updated inside intent policy */
1197 if (ptlrpc_req2svc(req)->srv_stats != NULL &&
1198 !(dlm_req->lock_flags & LDLM_FL_HAS_INTENT))
1199 ldlm_svc_get_eopc(dlm_req, ptlrpc_req2svc(req)->srv_stats);
1201 if (req->rq_export && req->rq_export->exp_nid_stats &&
1202 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1203 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1204 LDLM_ENQUEUE - LDLM_FIRST_OPC);
1206 if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE ||
1207 dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) {
1208 DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
1209 dlm_req->lock_desc.l_resource.lr_type);
1210 GOTO(out, rc = -EFAULT);
1213 if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE ||
1214 dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE ||
1215 dlm_req->lock_desc.l_req_mode &
1216 (dlm_req->lock_desc.l_req_mode-1))) {
1217 DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
1218 dlm_req->lock_desc.l_req_mode);
1219 GOTO(out, rc = -EFAULT);
1222 if (unlikely((flags & LDLM_FL_REPLAY) ||
1223 (lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))) {
1224 /* Find an existing lock in the per-export lock hash */
1225 /* In the function below, .hs_keycmp resolves to
1226 * ldlm_export_lock_keycmp() */
1227 /* coverity[overrun-buffer-val] */
1228 lock = cfs_hash_lookup(req->rq_export->exp_lock_hash,
1229 (void *)&dlm_req->lock_handle[0]);
1231 DEBUG_REQ(D_DLMTRACE, req, "found existing lock cookie %#llx",
1232 lock->l_handle.h_cookie);
1233 flags |= LDLM_FL_RESENT;
1234 GOTO(existing_lock, rc = 0);
1237 if (ldlm_reclaim_full()) {
1238 DEBUG_REQ(D_DLMTRACE, req, "Too many granted locks, "
1239 "reject current enqueue request and let the "
1240 "client retry later.\n");
1241 GOTO(out, rc = -EINPROGRESS);
1245 /* The lock's callback data might be set in the policy function */
1246 lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
1247 dlm_req->lock_desc.l_resource.lr_type,
1248 dlm_req->lock_desc.l_req_mode,
1249 cbs, NULL, 0, LVB_T_NONE);
1256 lock->l_remote_handle = dlm_req->lock_handle[0];
1257 LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
1259 /* Initialize resource lvb but not for a lock being replayed since
1260 * Client already got lvb sent in this case.
1261 * This must occur early since some policy methods assume resource
1262 * lvb is available (lr_lvb_data != NULL).
1264 res = lock->l_resource;
1265 if (!(flags & LDLM_FL_REPLAY)) {
1266 /* non-replayed lock, delayed lvb init may need to be done */
1267 rc = ldlm_lvbo_init(env, res);
1269 LDLM_DEBUG(lock, "delayed lvb init failed (rc %d)", rc);
1274 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
1275 /* Don't enqueue a lock onto the export if it is been disonnected
1276 * due to eviction (bug 3822) or server umount (bug 24324).
1277 * Cancel it now instead. */
1278 if (req->rq_export->exp_disconnected) {
1279 LDLM_ERROR(lock, "lock on disconnected export %p",
1281 GOTO(out, rc = -ENOTCONN);
1284 lock->l_export = class_export_lock_get(req->rq_export, lock);
1285 if (lock->l_export->exp_lock_hash)
1286 cfs_hash_add(lock->l_export->exp_lock_hash,
1287 &lock->l_remote_handle,
1290 /* Inherit the enqueue flags before the operation, because we do not
1291 * keep the res lock on return and next operations (BL AST) may proceed
1293 lock->l_flags |= ldlm_flags_from_wire(dlm_req->lock_flags &
1294 LDLM_FL_INHERIT_MASK);
1296 ldlm_convert_policy_to_local(req->rq_export,
1297 dlm_req->lock_desc.l_resource.lr_type,
1298 &dlm_req->lock_desc.l_policy_data,
1299 &lock->l_policy_data);
1300 if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
1301 lock->l_req_extent = lock->l_policy_data.l_extent;
1304 if (flags & LDLM_FL_HAS_INTENT) {
1305 /* In this case, the reply buffer is allocated deep in
1306 * local_lock_enqueue by the policy function. */
1309 /* based on the assumption that lvb size never changes during
1310 * resource life time otherwise it need resource->lr_lock's
1312 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
1313 RCL_SERVER, ldlm_lvbo_size(lock));
1315 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
1316 GOTO(out, rc = -ENOMEM);
1318 rc = req_capsule_server_pack(&req->rq_pill);
1323 err = ldlm_lock_enqueue(env, ns, &lock, cookie, &flags);
1330 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1332 ldlm_lock2desc(lock, &dlm_rep->lock_desc);
1333 ldlm_lock2handle(lock, &dlm_rep->lock_handle);
1335 if (lock && lock->l_resource->lr_type == LDLM_EXTENT)
1336 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_BL_EVICT, 6);
1338 /* We never send a blocking AST until the lock is granted, but
1339 * we can tell it right now */
1340 lock_res_and_lock(lock);
1342 /* Now take into account flags to be inherited from original lock
1343 request both in reply to client and in our own lock flags. */
1344 dlm_rep->lock_flags = ldlm_flags_to_wire(flags);
1345 lock->l_flags |= flags & LDLM_FL_INHERIT_MASK;
1347 /* Don't move a pending lock onto the export if it has already been
1348 * disconnected due to eviction (bug 5683) or server umount (bug 24324).
1349 * Cancel it now instead. */
1350 if (unlikely(req->rq_export->exp_disconnected ||
1351 OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
1352 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1354 } else if (ldlm_is_ast_sent(lock)) {
1355 /* fill lock desc for possible lock convert */
1356 if (lock->l_blocking_lock &&
1357 lock->l_resource->lr_type == LDLM_IBITS) {
1358 struct ldlm_lock *bl_lock = lock->l_blocking_lock;
1359 struct ldlm_lock_desc *rep_desc = &dlm_rep->lock_desc;
1362 "save blocking bits %llx in granted lock",
1363 bl_lock->l_policy_data.l_inodebits.bits);
1364 /* If lock is blocked then save blocking ibits
1365 * in returned lock policy for the possible lock
1366 * convert on a client.
1368 rep_desc->l_policy_data.l_inodebits.cancel_bits =
1369 bl_lock->l_policy_data.l_inodebits.bits;
1371 dlm_rep->lock_flags |= ldlm_flags_to_wire(LDLM_FL_AST_SENT);
1372 if (lock->l_granted_mode == lock->l_req_mode) {
1374 * Only cancel lock if it was granted, because it would
1375 * be destroyed immediately and would never be granted
1376 * in the future, causing timeouts on client. Not
1377 * granted lock will be cancelled immediately after
1378 * sending completion AST.
1380 if (dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1381 unlock_res_and_lock(lock);
1382 ldlm_lock_cancel(lock);
1383 lock_res_and_lock(lock);
1385 ldlm_add_waiting_lock(lock,
1386 ldlm_bl_timeout(lock));
1390 unlock_res_and_lock(lock);
1394 req->rq_status = rc ?: err; /* return either error - bug 11190 */
1395 if (!req->rq_packed_final) {
1396 err = lustre_pack_reply(req, 1, NULL, NULL);
1401 /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
1402 * ldlm_reprocess_all. If this moves, revisit that code. -phil */
1404 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
1405 "(err=%d, rc=%d)", err, rc);
1408 if (req_capsule_has_field(&req->rq_pill, &RMF_DLM_LVB,
1410 ldlm_lvbo_size(lock) > 0) {
1414 buf = req_capsule_server_get(&req->rq_pill,
1416 LASSERTF(buf != NULL, "req %p, lock %p\n",
1418 buflen = req_capsule_get_size(&req->rq_pill,
1419 &RMF_DLM_LVB, RCL_SERVER);
1420 /* non-replayed lock, delayed lvb init may
1421 * need to be occur now */
1422 if ((buflen > 0) && !(flags & LDLM_FL_REPLAY)) {
1423 buflen = ldlm_lvbo_fill(env, lock, buf,
1429 buflen, RCL_SERVER);
1432 } else if (flags & LDLM_FL_REPLAY) {
1433 /* no LVB resend upon replay */
1447 if (rc != 0 && !(flags & LDLM_FL_RESENT)) {
1448 if (lock->l_export) {
1449 ldlm_lock_cancel(lock);
1451 lock_res_and_lock(lock);
1452 ldlm_resource_unlink_lock(lock);
1453 ldlm_lock_destroy_nolock(lock);
1454 unlock_res_and_lock(lock);
1459 if (!err && !ldlm_is_cbpending(lock) &&
1460 dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
1461 ldlm_reprocess_all(lock->l_resource);
1463 LDLM_LOCK_RELEASE(lock);
1466 LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
1473 * Main LDLM entry point for server code to process lock conversion requests.
1475 int ldlm_handle_convert0(struct ptlrpc_request *req,
1476 const struct ldlm_request *dlm_req)
1478 struct obd_export *exp = req->rq_export;
1479 struct ldlm_reply *dlm_rep;
1480 struct ldlm_lock *lock;
1485 if (exp && exp->exp_nid_stats && exp->exp_nid_stats->nid_ldlm_stats)
1486 lprocfs_counter_incr(exp->exp_nid_stats->nid_ldlm_stats,
1487 LDLM_CONVERT - LDLM_FIRST_OPC);
1489 rc = req_capsule_server_pack(&req->rq_pill);
1493 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1494 dlm_rep->lock_flags = dlm_req->lock_flags;
1496 lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
1501 bits = lock->l_policy_data.l_inodebits.bits;
1502 new = dlm_req->lock_desc.l_policy_data.l_inodebits.bits;
1503 LDLM_DEBUG(lock, "server-side convert handler START");
1505 if (ldlm_is_cancel(lock)) {
1506 LDLM_ERROR(lock, "convert on canceled lock!");
1507 rc = ELDLM_NO_LOCK_DATA;
1508 } else if (dlm_req->lock_desc.l_req_mode !=
1509 lock->l_granted_mode) {
1510 LDLM_ERROR(lock, "lock mode differs!");
1511 rc = ELDLM_NO_LOCK_DATA;
1512 } else if (bits == new) {
1513 /* This can be valid situation if CONVERT RPCs are
1514 * re-ordered. Just finish silently */
1515 LDLM_DEBUG(lock, "lock is converted already!");
1518 lock_res_and_lock(lock);
1519 if (ldlm_is_waited(lock))
1520 ldlm_del_waiting_lock(lock);
1522 ldlm_clear_cbpending(lock);
1523 lock->l_policy_data.l_inodebits.cancel_bits = 0;
1524 ldlm_inodebits_drop(lock, bits & ~new);
1525 /* if lock is in a bl_ast list, remove it from the list
1526 * here before reprocessing.
1528 if (!list_empty(&lock->l_bl_ast)) {
1529 ldlm_discard_bl_lock(lock);
1531 /* in this case lock was taken from bl_ast list
1532 * already by ldlm_work_bl_ast_lock() and lock
1533 * must clear only some remaining states.
1535 ldlm_clear_ast_sent(lock);
1536 lock->l_bl_ast_run = 0;
1537 ldlm_clear_blocking_lock(lock);
1539 unlock_res_and_lock(lock);
1541 ldlm_reprocess_all(lock->l_resource);
1545 if (rc == ELDLM_OK) {
1546 dlm_rep->lock_handle = lock->l_remote_handle;
1547 ldlm_ibits_policy_local_to_wire(&lock->l_policy_data,
1548 &dlm_rep->lock_desc.l_policy_data);
1551 LDLM_DEBUG(lock, "server-side convert handler END, rc = %d",
1553 LDLM_LOCK_PUT(lock);
1555 rc = ELDLM_NO_LOCK_DATA;
1556 LDLM_DEBUG_NOLOCK("server-side convert handler END, rc = %d",
1560 req->rq_status = rc;
1566 * Cancel all the locks whose handles are packed into ldlm_request
1568 * Called by server code expecting such combined cancel activity
1571 int ldlm_request_cancel(struct ptlrpc_request *req,
1572 const struct ldlm_request *dlm_req,
1573 int first, enum lustre_at_flags flags)
1575 const struct lu_env *env = req->rq_svc_thread->t_env;
1576 struct ldlm_resource *res, *pres = NULL;
1577 struct ldlm_lock *lock;
1578 int i, count, done = 0;
1581 count = dlm_req->lock_count ? dlm_req->lock_count : 1;
1585 if (count == 1 && dlm_req->lock_handle[0].cookie == 0)
1588 /* There is no lock on the server at the replay time,
1589 * skip lock cancelling to make replay tests to pass. */
1590 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1593 LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, "
1594 "starting at %d", count, first);
1596 for (i = first; i < count; i++) {
1597 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
1599 LDLM_DEBUG_NOLOCK("server-side cancel handler stale "
1600 "lock (cookie %llu)",
1601 dlm_req->lock_handle[i].cookie);
1605 res = lock->l_resource;
1608 /* This code is an optimization to only attempt lock
1609 * granting on the resource (that could be CPU-expensive)
1610 * after we are done cancelling lock in that resource. */
1613 ldlm_reprocess_all(pres);
1614 LDLM_RESOURCE_DELREF(pres);
1615 ldlm_resource_putref(pres);
1618 ldlm_resource_getref(res);
1619 LDLM_RESOURCE_ADDREF(res);
1621 if (!ldlm_is_discard_data(lock))
1622 ldlm_lvbo_update(env, res, lock,
1628 if ((flags & LATF_STATS) && ldlm_is_ast_sent(lock) &&
1629 lock->l_blast_sent != 0) {
1630 time64_t delay = ktime_get_real_seconds() -
1632 LDLM_DEBUG(lock, "server cancels blocked lock after %llds",
1634 at_measured(&lock->l_export->exp_bl_lock_at, delay);
1636 ldlm_lock_cancel(lock);
1637 LDLM_LOCK_PUT(lock);
1640 ldlm_reprocess_all(pres);
1641 LDLM_RESOURCE_DELREF(pres);
1642 ldlm_resource_putref(pres);
1644 LDLM_DEBUG_NOLOCK("server-side cancel handler END");
1647 EXPORT_SYMBOL(ldlm_request_cancel);
1650 * Main LDLM entry point for server code to cancel locks.
1652 * Typically gets called from service handler on LDLM_CANCEL opc.
1654 int ldlm_handle_cancel(struct ptlrpc_request *req)
1656 struct ldlm_request *dlm_req;
1660 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1661 if (dlm_req == NULL) {
1662 CDEBUG(D_INFO, "bad request buffer for cancel\n");
1666 if (req->rq_export && req->rq_export->exp_nid_stats &&
1667 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1668 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1669 LDLM_CANCEL - LDLM_FIRST_OPC);
1671 rc = req_capsule_server_pack(&req->rq_pill);
1675 if (!ldlm_request_cancel(req, dlm_req, 0, LATF_STATS))
1676 req->rq_status = LUSTRE_ESTALE;
1678 RETURN(ptlrpc_reply(req));
1680 #endif /* HAVE_SERVER_SUPPORT */
1683 * Callback handler for receiving incoming blocking ASTs.
1685 * This can only happen on client side.
1687 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
1688 struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1693 LDLM_DEBUG(lock, "client blocking AST callback handler");
1695 lock_res_and_lock(lock);
1697 /* set bits to cancel for this lock for possible lock convert */
1698 if (ns_is_client(ns) && (lock->l_resource->lr_type == LDLM_IBITS)) {
1699 /* Lock description contains policy of blocking lock,
1700 * and its cancel_bits is used to pass conflicting bits.
1701 * NOTE: ld can be NULL or can be not NULL but zeroed if
1702 * passed from ldlm_bl_thread_blwi(), check below used bits
1703 * in ld to make sure it is valid description.
1705 if (ld && ld->l_policy_data.l_inodebits.bits)
1706 lock->l_policy_data.l_inodebits.cancel_bits =
1707 ld->l_policy_data.l_inodebits.cancel_bits;
1708 /* if there is no valid ld and lock is cbpending already
1709 * then cancel_bits should be kept, otherwise it is zeroed.
1711 else if (!ldlm_is_cbpending(lock))
1712 lock->l_policy_data.l_inodebits.cancel_bits = 0;
1714 ldlm_set_cbpending(lock);
1716 if (ldlm_is_cancel_on_block(lock))
1717 ldlm_set_cancel(lock);
1719 do_ast = (!lock->l_readers && !lock->l_writers);
1720 unlock_res_and_lock(lock);
1723 CDEBUG(D_DLMTRACE, "Lock %p already unused, calling callback (%p)\n",
1724 lock, lock->l_blocking_ast);
1725 if (lock->l_blocking_ast != NULL)
1726 lock->l_blocking_ast(lock, ld, lock->l_ast_data,
1729 CDEBUG(D_DLMTRACE, "Lock %p is referenced, will be cancelled later\n",
1733 LDLM_DEBUG(lock, "client blocking callback handler END");
1734 LDLM_LOCK_RELEASE(lock);
1739 * Callback handler for receiving incoming completion ASTs.
1741 * This only can happen on client side.
1743 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
1744 struct ldlm_namespace *ns,
1745 struct ldlm_request *dlm_req,
1746 struct ldlm_lock *lock)
1748 struct list_head ast_list;
1753 LDLM_DEBUG(lock, "client completion callback handler START");
1755 INIT_LIST_HEAD(&ast_list);
1756 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) {
1757 long to = cfs_time_seconds(1);
1760 set_current_state(TASK_INTERRUPTIBLE);
1761 schedule_timeout(to);
1762 if (lock->l_granted_mode == lock->l_req_mode ||
1763 ldlm_is_destroyed(lock))
1768 lvb_len = req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT);
1770 LDLM_ERROR(lock, "Fail to get lvb_len, rc = %d", lvb_len);
1771 GOTO(out, rc = lvb_len);
1772 } else if (lvb_len > 0) {
1773 if (lock->l_lvb_len > 0) {
1774 /* for extent lock, lvb contains ost_lvb{}. */
1775 LASSERT(lock->l_lvb_data != NULL);
1777 if (unlikely(lock->l_lvb_len < lvb_len)) {
1778 LDLM_ERROR(lock, "Replied LVB is larger than "
1779 "expectation, expected = %d, "
1781 lock->l_lvb_len, lvb_len);
1782 GOTO(out, rc = -EINVAL);
1787 lock_res_and_lock(lock);
1788 if (ldlm_is_destroyed(lock) ||
1789 lock->l_granted_mode == lock->l_req_mode) {
1790 /* bug 11300: the lock has already been granted */
1791 unlock_res_and_lock(lock);
1792 LDLM_DEBUG(lock, "Double grant race happened");
1796 /* If we receive the completion AST before the actual enqueue returned,
1797 * then we might need to switch lock modes, resources, or extents. */
1798 if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
1799 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
1800 LDLM_DEBUG(lock, "completion AST, new lock mode");
1803 if (lock->l_resource->lr_type != LDLM_PLAIN) {
1804 ldlm_convert_policy_to_local(req->rq_export,
1805 dlm_req->lock_desc.l_resource.lr_type,
1806 &dlm_req->lock_desc.l_policy_data,
1807 &lock->l_policy_data);
1808 LDLM_DEBUG(lock, "completion AST, new policy data");
1811 ldlm_resource_unlink_lock(lock);
1812 if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
1813 &lock->l_resource->lr_name,
1814 sizeof(lock->l_resource->lr_name)) != 0) {
1815 unlock_res_and_lock(lock);
1816 rc = ldlm_lock_change_resource(ns, lock,
1817 &dlm_req->lock_desc.l_resource.lr_name);
1819 LDLM_ERROR(lock, "Failed to allocate resource");
1822 LDLM_DEBUG(lock, "completion AST, new resource");
1823 CERROR("change resource!\n");
1824 lock_res_and_lock(lock);
1827 if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
1828 /* BL_AST locks are not needed in LRU.
1829 * Let ldlm_cancel_lru() be fast. */
1830 ldlm_lock_remove_from_lru(lock);
1831 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
1832 LDLM_DEBUG(lock, "completion AST includes blocking AST");
1835 if (lock->l_lvb_len > 0) {
1836 rc = ldlm_fill_lvb(lock, &req->rq_pill, RCL_CLIENT,
1837 lock->l_lvb_data, lvb_len);
1839 unlock_res_and_lock(lock);
1844 ldlm_grant_lock(lock, &ast_list);
1845 unlock_res_and_lock(lock);
1847 LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
1849 /* Let Enqueue to call osc_lock_upcall() and initialize
1851 OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 2);
1853 ldlm_run_ast_work(ns, &ast_list, LDLM_WORK_CP_AST);
1855 LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
1861 lock_res_and_lock(lock);
1862 ldlm_set_failed(lock);
1863 unlock_res_and_lock(lock);
1864 wake_up(&lock->l_waitq);
1866 LDLM_LOCK_RELEASE(lock);
1870 * Callback handler for receiving incoming glimpse ASTs.
1872 * This only can happen on client side. After handling the glimpse AST
1873 * we also consider dropping the lock here if it is unused locally for a
1876 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
1877 struct ldlm_namespace *ns,
1878 struct ldlm_request *dlm_req,
1879 struct ldlm_lock *lock)
1884 LDLM_DEBUG(lock, "client glimpse AST callback handler");
1886 if (lock->l_glimpse_ast != NULL)
1887 rc = lock->l_glimpse_ast(lock, req);
1889 if (req->rq_repmsg != NULL) {
1892 req->rq_status = rc;
1896 lock_res_and_lock(lock);
1897 if (lock->l_granted_mode == LCK_PW &&
1898 !lock->l_readers && !lock->l_writers &&
1899 ktime_after(ktime_get(),
1900 ktime_add(lock->l_last_used,
1901 ktime_set(ns->ns_dirty_age_limit, 0)))) {
1902 unlock_res_and_lock(lock);
1903 if (ldlm_bl_to_thread_lock(ns, NULL, lock))
1904 ldlm_handle_bl_callback(ns, NULL, lock);
1909 unlock_res_and_lock(lock);
1910 LDLM_LOCK_RELEASE(lock);
1914 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1916 if (req->rq_no_reply)
1919 req->rq_status = rc;
1920 if (!req->rq_packed_final) {
1921 rc = lustre_pack_reply(req, 1, NULL, NULL);
1925 return ptlrpc_reply(req);
1928 static int __ldlm_bl_to_thread(struct ldlm_bl_work_item *blwi,
1929 enum ldlm_cancel_flags cancel_flags)
1931 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1934 spin_lock(&blp->blp_lock);
1935 if (blwi->blwi_lock &&
1936 ldlm_is_discard_data(blwi->blwi_lock)) {
1937 /* add LDLM_FL_DISCARD_DATA requests to the priority list */
1938 list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
1940 /* other blocking callbacks are added to the regular list */
1941 list_add_tail(&blwi->blwi_entry, &blp->blp_list);
1943 spin_unlock(&blp->blp_lock);
1945 wake_up(&blp->blp_waitq);
1947 /* can not check blwi->blwi_flags as blwi could be already freed in
1949 if (!(cancel_flags & LCF_ASYNC))
1950 wait_for_completion(&blwi->blwi_comp);
1955 static inline void init_blwi(struct ldlm_bl_work_item *blwi,
1956 struct ldlm_namespace *ns,
1957 struct ldlm_lock_desc *ld,
1958 struct list_head *cancels, int count,
1959 struct ldlm_lock *lock,
1960 enum ldlm_cancel_flags cancel_flags)
1962 init_completion(&blwi->blwi_comp);
1963 INIT_LIST_HEAD(&blwi->blwi_head);
1965 if (memory_pressure_get())
1966 blwi->blwi_mem_pressure = 1;
1969 blwi->blwi_flags = cancel_flags;
1971 blwi->blwi_ld = *ld;
1973 list_add(&blwi->blwi_head, cancels);
1974 list_del_init(cancels);
1975 blwi->blwi_count = count;
1977 blwi->blwi_lock = lock;
1982 * Queues a list of locks \a cancels containing \a count locks
1983 * for later processing by a blocking thread. If \a count is zero,
1984 * then the lock referenced as \a lock is queued instead.
1986 * The blocking thread would then call ->l_blocking_ast callback in the lock.
1987 * If list addition fails an error is returned and caller is supposed to
1988 * call ->l_blocking_ast itself.
1990 static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
1991 struct ldlm_lock_desc *ld,
1992 struct ldlm_lock *lock,
1993 struct list_head *cancels, int count,
1994 enum ldlm_cancel_flags cancel_flags)
1998 if (cancels && count == 0)
2001 if (cancel_flags & LCF_ASYNC) {
2002 struct ldlm_bl_work_item *blwi;
2004 OBD_ALLOC(blwi, sizeof(*blwi));
2007 init_blwi(blwi, ns, ld, cancels, count, lock, cancel_flags);
2009 RETURN(__ldlm_bl_to_thread(blwi, cancel_flags));
2011 /* if it is synchronous call do minimum mem alloc, as it could
2012 * be triggered from kernel shrinker
2014 struct ldlm_bl_work_item blwi;
2016 memset(&blwi, 0, sizeof(blwi));
2017 init_blwi(&blwi, ns, ld, cancels, count, lock, cancel_flags);
2018 RETURN(__ldlm_bl_to_thread(&blwi, cancel_flags));
2023 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
2024 struct ldlm_lock *lock)
2026 return ldlm_bl_to_thread(ns, ld, lock, NULL, 0, LCF_ASYNC);
2029 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
2030 struct list_head *cancels, int count,
2031 enum ldlm_cancel_flags cancel_flags)
2033 return ldlm_bl_to_thread(ns, ld, NULL, cancels, count, cancel_flags);
2036 int ldlm_bl_thread_wakeup(void)
2038 wake_up(&ldlm_state->ldlm_bl_pool->blp_waitq);
2042 /* Setinfo coming from Server (eg MDT) to Client (eg MDC)! */
2043 static int ldlm_handle_setinfo(struct ptlrpc_request *req)
2045 struct obd_device *obd = req->rq_export->exp_obd;
2052 DEBUG_REQ(D_HSM, req, "%s: handle setinfo\n", obd->obd_name);
2054 req_capsule_set(&req->rq_pill, &RQF_OBD_SET_INFO);
2056 key = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
2058 DEBUG_REQ(D_IOCTL, req, "no set_info key");
2061 keylen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_KEY,
2063 val = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
2065 DEBUG_REQ(D_IOCTL, req, "no set_info val");
2068 vallen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_VAL,
2071 /* We are responsible for swabbing contents of val */
2073 if (KEY_IS(KEY_HSM_COPYTOOL_SEND))
2074 /* Pass it on to mdc (the "export" in this case) */
2075 rc = obd_set_info_async(req->rq_svc_thread->t_env,
2077 sizeof(KEY_HSM_COPYTOOL_SEND),
2078 KEY_HSM_COPYTOOL_SEND,
2081 DEBUG_REQ(D_WARNING, req, "ignoring unknown key %s", key);
2086 static inline void ldlm_callback_errmsg(struct ptlrpc_request *req,
2087 const char *msg, int rc,
2088 const struct lustre_handle *handle)
2090 DEBUG_REQ((req->rq_no_reply || rc) ? D_WARNING : D_DLMTRACE, req,
2091 "%s: [nid %s] [rc %d] [lock %#llx]",
2092 msg, libcfs_id2str(req->rq_peer), rc,
2093 handle ? handle->cookie : 0);
2094 if (req->rq_no_reply)
2095 CWARN("No reply was sent, maybe cause bug 21636.\n");
2097 CWARN("Send reply failed, maybe cause bug 21636.\n");
2100 /* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */
2101 static int ldlm_callback_handler(struct ptlrpc_request *req)
2103 struct ldlm_namespace *ns;
2104 struct ldlm_request *dlm_req;
2105 struct ldlm_lock *lock;
2109 /* Requests arrive in sender's byte order. The ptlrpc service
2110 * handler has already checked and, if necessary, byte-swapped the
2111 * incoming request message body, but I am responsible for the
2112 * message buffers. */
2114 /* do nothing for sec context finalize */
2115 if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI)
2118 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2120 if (req->rq_export == NULL) {
2121 rc = ldlm_callback_reply(req, -ENOTCONN);
2122 ldlm_callback_errmsg(req, "Operate on unconnected server",
2127 LASSERT(req->rq_export != NULL);
2128 LASSERT(req->rq_export->exp_obd != NULL);
2130 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2131 case LDLM_BL_CALLBACK:
2132 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET)) {
2134 ldlm_callback_reply(req, -(int)cfs_fail_err);
2138 case LDLM_CP_CALLBACK:
2139 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK_NET))
2142 case LDLM_GL_CALLBACK:
2143 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK_NET))
2147 rc = ldlm_handle_setinfo(req);
2148 ldlm_callback_reply(req, rc);
2151 CERROR("unknown opcode %u\n",
2152 lustre_msg_get_opc(req->rq_reqmsg));
2153 ldlm_callback_reply(req, -EPROTO);
2157 ns = req->rq_export->exp_obd->obd_namespace;
2158 LASSERT(ns != NULL);
2160 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2162 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2163 if (dlm_req == NULL) {
2164 rc = ldlm_callback_reply(req, -EPROTO);
2165 ldlm_callback_errmsg(req, "Operate without parameter", rc,
2170 /* Force a known safe race, send a cancel to the server for a lock
2171 * which the server has already started a blocking callback on. */
2172 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE) &&
2173 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
2174 rc = ldlm_cli_cancel(&dlm_req->lock_handle[0], 0);
2176 CERROR("ldlm_cli_cancel: %d\n", rc);
2179 lock = ldlm_handle2lock_long(&dlm_req->lock_handle[0], 0);
2181 CDEBUG(D_DLMTRACE, "callback on lock %#llx - lock "
2182 "disappeared\n", dlm_req->lock_handle[0].cookie);
2183 rc = ldlm_callback_reply(req, -EINVAL);
2184 ldlm_callback_errmsg(req, "Operate with invalid parameter", rc,
2185 &dlm_req->lock_handle[0]);
2189 if (ldlm_is_fail_loc(lock) &&
2190 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK)
2191 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
2193 /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
2194 lock_res_and_lock(lock);
2195 lock->l_flags |= ldlm_flags_from_wire(dlm_req->lock_flags &
2197 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
2198 /* If somebody cancels lock and cache is already dropped,
2199 * or lock is failed before cp_ast received on client,
2200 * we can tell the server we have no lock. Otherwise, we
2201 * should send cancel after dropping the cache. */
2202 if ((ldlm_is_canceling(lock) && ldlm_is_bl_done(lock)) ||
2203 ldlm_is_failed(lock)) {
2204 LDLM_DEBUG(lock, "callback on lock %llx - lock disappeared",
2205 dlm_req->lock_handle[0].cookie);
2206 unlock_res_and_lock(lock);
2207 LDLM_LOCK_RELEASE(lock);
2208 rc = ldlm_callback_reply(req, -EINVAL);
2209 ldlm_callback_errmsg(req, "Operate on stale lock", rc,
2210 &dlm_req->lock_handle[0]);
2213 /* BL_AST locks are not needed in LRU.
2214 * Let ldlm_cancel_lru() be fast. */
2215 ldlm_lock_remove_from_lru(lock);
2216 ldlm_set_bl_ast(lock);
2218 unlock_res_and_lock(lock);
2220 /* We want the ost thread to get this reply so that it can respond
2221 * to ost requests (write cache writeback) that might be triggered
2224 * But we'd also like to be able to indicate in the reply that we're
2225 * cancelling right now, because it's unused, or have an intent result
2226 * in the reply, so we might have to push the responsibility for sending
2227 * the reply down into the AST handlers, alas. */
2229 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2230 case LDLM_BL_CALLBACK:
2231 CDEBUG(D_INODE, "blocking ast\n");
2232 req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
2233 if (!ldlm_is_cancel_on_block(lock)) {
2234 rc = ldlm_callback_reply(req, 0);
2235 if (req->rq_no_reply || rc)
2236 ldlm_callback_errmsg(req, "Normal process", rc,
2237 &dlm_req->lock_handle[0]);
2239 if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
2240 ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
2242 case LDLM_CP_CALLBACK:
2243 CDEBUG(D_INODE, "completion ast\n");
2244 req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
2245 ldlm_callback_reply(req, 0);
2246 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
2248 case LDLM_GL_CALLBACK:
2249 CDEBUG(D_INODE, "glimpse ast\n");
2250 req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
2251 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
2254 LBUG(); /* checked above */
2260 #ifdef HAVE_SERVER_SUPPORT
2262 * Main handler for canceld thread.
2264 * Separated into its own thread to avoid deadlocks.
2266 static int ldlm_cancel_handler(struct ptlrpc_request *req)
2272 /* Requests arrive in sender's byte order. The ptlrpc service
2273 * handler has already checked and, if necessary, byte-swapped the
2274 * incoming request message body, but I am responsible for the
2275 * message buffers. */
2277 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2279 if (req->rq_export == NULL) {
2280 struct ldlm_request *dlm_req;
2282 CERROR("%s from %s arrived at %lu with bad export cookie "
2284 ll_opcode2str(lustre_msg_get_opc(req->rq_reqmsg)),
2285 libcfs_nid2str(req->rq_peer.nid),
2286 req->rq_arrival_time.tv_sec,
2287 lustre_msg_get_handle(req->rq_reqmsg)->cookie);
2289 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_CANCEL) {
2290 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2291 dlm_req = req_capsule_client_get(&req->rq_pill,
2293 if (dlm_req != NULL)
2294 ldlm_lock_dump_handle(D_ERROR,
2295 &dlm_req->lock_handle[0]);
2297 ldlm_callback_reply(req, -ENOTCONN);
2301 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2302 /* XXX FIXME move this back to mds/handler.c, bug 249 */
2304 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
2305 CDEBUG(D_INODE, "cancel\n");
2306 if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_NET) ||
2307 CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND) ||
2308 CFS_FAIL_CHECK(OBD_FAIL_LDLM_BL_EVICT))
2310 rc = ldlm_handle_cancel(req);
2314 struct ldlm_request *dlm_req;
2316 req_capsule_set(&req->rq_pill, &RQF_LDLM_CONVERT);
2317 CDEBUG(D_INODE, "convert\n");
2319 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2320 if (dlm_req == NULL) {
2321 CDEBUG(D_INFO, "bad request buffer for cancel\n");
2322 rc = ldlm_callback_reply(req, -EPROTO);
2324 req->rq_status = ldlm_handle_convert0(req, dlm_req);
2325 rc = ptlrpc_reply(req);
2330 CERROR("invalid opcode %d\n",
2331 lustre_msg_get_opc(req->rq_reqmsg));
2332 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2333 rc = ldlm_callback_reply(req, -EINVAL);
2339 static int ldlm_cancel_hpreq_lock_match(struct ptlrpc_request *req,
2340 struct ldlm_lock *lock)
2342 struct ldlm_request *dlm_req;
2343 struct lustre_handle lockh;
2349 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2350 if (dlm_req == NULL)
2353 ldlm_lock2handle(lock, &lockh);
2354 for (i = 0; i < dlm_req->lock_count; i++) {
2355 if (lustre_handle_equal(&dlm_req->lock_handle[i],
2357 DEBUG_REQ(D_RPCTRACE, req,
2358 "Prio raised by lock %#llx.", lockh.cookie);
2367 static int ldlm_cancel_hpreq_check(struct ptlrpc_request *req)
2369 struct ldlm_request *dlm_req;
2375 /* no prolong in recovery */
2376 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
2379 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2380 if (dlm_req == NULL)
2383 for (i = 0; i < dlm_req->lock_count; i++) {
2384 struct ldlm_lock *lock;
2386 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
2390 rc = ldlm_is_ast_sent(lock) ? 1 : 0;
2392 LDLM_DEBUG(lock, "hpreq cancel/convert lock");
2393 LDLM_LOCK_PUT(lock);
2402 static struct ptlrpc_hpreq_ops ldlm_cancel_hpreq_ops = {
2403 .hpreq_lock_match = ldlm_cancel_hpreq_lock_match,
2404 .hpreq_check = ldlm_cancel_hpreq_check,
2408 static int ldlm_hpreq_handler(struct ptlrpc_request *req)
2412 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2414 if (req->rq_export == NULL)
2417 if (LDLM_CANCEL == lustre_msg_get_opc(req->rq_reqmsg)) {
2418 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
2419 req->rq_ops = &ldlm_cancel_hpreq_ops;
2420 } else if (LDLM_CONVERT == lustre_msg_get_opc(req->rq_reqmsg)) {
2421 req_capsule_set(&req->rq_pill, &RQF_LDLM_CONVERT);
2422 req->rq_ops = &ldlm_cancel_hpreq_ops;
2427 static int ldlm_revoke_lock_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
2428 struct hlist_node *hnode, void *data)
2431 struct list_head *rpc_list = data;
2432 struct ldlm_lock *lock = cfs_hash_object(hs, hnode);
2434 lock_res_and_lock(lock);
2436 if (lock->l_req_mode != lock->l_granted_mode) {
2437 unlock_res_and_lock(lock);
2441 LASSERT(lock->l_resource);
2442 if (lock->l_resource->lr_type != LDLM_IBITS &&
2443 lock->l_resource->lr_type != LDLM_PLAIN) {
2444 unlock_res_and_lock(lock);
2448 if (ldlm_is_ast_sent(lock)) {
2449 unlock_res_and_lock(lock);
2453 LASSERT(lock->l_blocking_ast);
2454 LASSERT(!lock->l_blocking_lock);
2456 ldlm_set_ast_sent(lock);
2457 if (lock->l_export && lock->l_export->exp_lock_hash) {
2458 /* NB: it's safe to call cfs_hash_del() even lock isn't
2459 * in exp_lock_hash. */
2460 /* In the function below, .hs_keycmp resolves to
2461 * ldlm_export_lock_keycmp() */
2462 /* coverity[overrun-buffer-val] */
2463 cfs_hash_del(lock->l_export->exp_lock_hash,
2464 &lock->l_remote_handle, &lock->l_exp_hash);
2467 list_add_tail(&lock->l_rk_ast, rpc_list);
2468 LDLM_LOCK_GET(lock);
2470 unlock_res_and_lock(lock);
2474 void ldlm_revoke_export_locks(struct obd_export *exp)
2476 struct list_head rpc_list;
2479 INIT_LIST_HEAD(&rpc_list);
2480 cfs_hash_for_each_nolock(exp->exp_lock_hash,
2481 ldlm_revoke_lock_cb, &rpc_list, 0);
2482 ldlm_run_ast_work(exp->exp_obd->obd_namespace, &rpc_list,
2483 LDLM_WORK_REVOKE_AST);
2487 EXPORT_SYMBOL(ldlm_revoke_export_locks);
2488 #endif /* HAVE_SERVER_SUPPORT */
2490 static int ldlm_bl_get_work(struct ldlm_bl_pool *blp,
2491 struct ldlm_bl_work_item **p_blwi,
2492 struct obd_export **p_exp)
2494 struct ldlm_bl_work_item *blwi = NULL;
2495 static unsigned int num_bl = 0;
2496 static unsigned int num_stale;
2497 int num_th = atomic_read(&blp->blp_num_threads);
2499 *p_exp = obd_stale_export_get();
2501 spin_lock(&blp->blp_lock);
2502 if (*p_exp != NULL) {
2503 if (num_th == 1 || ++num_stale < num_th) {
2504 spin_unlock(&blp->blp_lock);
2511 /* process a request from the blp_list at least every blp_num_threads */
2512 if (!list_empty(&blp->blp_list) &&
2513 (list_empty(&blp->blp_prio_list) || num_bl == 0))
2514 blwi = list_entry(blp->blp_list.next,
2515 struct ldlm_bl_work_item, blwi_entry);
2517 if (!list_empty(&blp->blp_prio_list))
2518 blwi = list_entry(blp->blp_prio_list.next,
2519 struct ldlm_bl_work_item,
2523 if (++num_bl >= num_th)
2525 list_del(&blwi->blwi_entry);
2527 spin_unlock(&blp->blp_lock);
2530 if (*p_exp != NULL && *p_blwi != NULL) {
2531 obd_stale_export_put(*p_exp);
2535 return (*p_blwi != NULL || *p_exp != NULL) ? 1 : 0;
2538 /* This only contains temporary data until the thread starts */
2539 struct ldlm_bl_thread_data {
2540 struct ldlm_bl_pool *bltd_blp;
2541 struct completion bltd_comp;
2545 static int ldlm_bl_thread_main(void *arg);
2547 static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp, bool check_busy)
2549 struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
2550 struct task_struct *task;
2552 init_completion(&bltd.bltd_comp);
2554 bltd.bltd_num = atomic_inc_return(&blp->blp_num_threads);
2555 if (bltd.bltd_num >= blp->blp_max_threads) {
2556 atomic_dec(&blp->blp_num_threads);
2560 LASSERTF(bltd.bltd_num > 0, "thread num:%d\n", bltd.bltd_num);
2562 atomic_read(&blp->blp_busy_threads) < (bltd.bltd_num - 1)) {
2563 atomic_dec(&blp->blp_num_threads);
2567 task = kthread_run(ldlm_bl_thread_main, &bltd, "ldlm_bl_%02d",
2570 CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %ld\n",
2571 bltd.bltd_num, PTR_ERR(task));
2572 atomic_dec(&blp->blp_num_threads);
2573 return PTR_ERR(task);
2575 wait_for_completion(&bltd.bltd_comp);
2580 /* Not fatal if racy and have a few too many threads */
2581 static int ldlm_bl_thread_need_create(struct ldlm_bl_pool *blp,
2582 struct ldlm_bl_work_item *blwi)
2584 if (atomic_read(&blp->blp_num_threads) >= blp->blp_max_threads)
2587 if (atomic_read(&blp->blp_busy_threads) <
2588 atomic_read(&blp->blp_num_threads))
2591 if (blwi != NULL && (blwi->blwi_ns == NULL ||
2592 blwi->blwi_mem_pressure))
2598 static int ldlm_bl_thread_blwi(struct ldlm_bl_pool *blp,
2599 struct ldlm_bl_work_item *blwi)
2603 if (blwi->blwi_ns == NULL)
2604 /* added by ldlm_cleanup() */
2605 RETURN(LDLM_ITER_STOP);
2607 if (blwi->blwi_mem_pressure)
2608 memory_pressure_set();
2610 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_PAUSE_CANCEL2, 4);
2612 if (blwi->blwi_count) {
2614 /* The special case when we cancel locks in lru
2615 * asynchronously, we pass the list of locks here.
2616 * Thus locks are marked LDLM_FL_CANCELING, but NOT
2617 * canceled locally yet. */
2618 count = ldlm_cli_cancel_list_local(&blwi->blwi_head,
2621 ldlm_cli_cancel_list(&blwi->blwi_head, count, NULL,
2624 ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
2627 if (blwi->blwi_mem_pressure)
2628 memory_pressure_clr();
2630 if (blwi->blwi_flags & LCF_ASYNC)
2631 OBD_FREE(blwi, sizeof(*blwi));
2633 complete(&blwi->blwi_comp);
2639 * Cancel stale locks on export. Cancel blocked locks first.
2640 * If the given export has blocked locks, the next in the list may have
2641 * them too, thus cancel not blocked locks only if the current export has
2644 static int ldlm_bl_thread_exports(struct ldlm_bl_pool *blp,
2645 struct obd_export *exp)
2650 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_BL_EVICT, 4);
2652 num = ldlm_export_cancel_blocked_locks(exp);
2654 ldlm_export_cancel_locks(exp);
2656 obd_stale_export_put(exp);
2663 * Main blocking requests processing thread.
2665 * Callers put locks into its queue by calling ldlm_bl_to_thread.
2666 * This thread in the end ends up doing actual call to ->l_blocking_ast
2669 static int ldlm_bl_thread_main(void *arg)
2671 struct ldlm_bl_pool *blp;
2672 struct ldlm_bl_thread_data *bltd = arg;
2675 blp = bltd->bltd_blp;
2677 complete(&bltd->bltd_comp);
2678 /* cannot use bltd after this, it is only on caller's stack */
2681 struct l_wait_info lwi = { 0 };
2682 struct ldlm_bl_work_item *blwi = NULL;
2683 struct obd_export *exp = NULL;
2686 rc = ldlm_bl_get_work(blp, &blwi, &exp);
2689 l_wait_event_exclusive(blp->blp_waitq,
2690 ldlm_bl_get_work(blp, &blwi,
2693 atomic_inc(&blp->blp_busy_threads);
2695 if (ldlm_bl_thread_need_create(blp, blwi))
2696 /* discard the return value, we tried */
2697 ldlm_bl_thread_start(blp, true);
2700 rc = ldlm_bl_thread_exports(blp, exp);
2702 rc = ldlm_bl_thread_blwi(blp, blwi);
2704 atomic_dec(&blp->blp_busy_threads);
2706 if (rc == LDLM_ITER_STOP)
2709 /* If there are many namespaces, we will not sleep waiting for
2710 * work, and must do a cond_resched to avoid holding the CPU
2715 atomic_dec(&blp->blp_num_threads);
2716 complete(&blp->blp_comp);
2721 static int ldlm_setup(void);
2722 static int ldlm_cleanup(void);
2724 int ldlm_get_ref(void)
2728 mutex_lock(&ldlm_ref_mutex);
2729 if (++ldlm_refcount == 1) {
2734 mutex_unlock(&ldlm_ref_mutex);
2739 void ldlm_put_ref(void)
2742 mutex_lock(&ldlm_ref_mutex);
2743 if (ldlm_refcount == 1) {
2744 int rc = ldlm_cleanup();
2746 CERROR("ldlm_cleanup failed: %d\n", rc);
2752 mutex_unlock(&ldlm_ref_mutex);
2758 * Export handle<->lock hash operations.
2761 ldlm_export_lock_hash(struct cfs_hash *hs, const void *key, unsigned mask)
2763 return cfs_hash_u64_hash(((struct lustre_handle *)key)->cookie, mask);
2767 ldlm_export_lock_key(struct hlist_node *hnode)
2769 struct ldlm_lock *lock;
2771 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2772 return &lock->l_remote_handle;
2776 ldlm_export_lock_keycpy(struct hlist_node *hnode, void *key)
2778 struct ldlm_lock *lock;
2780 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2781 lock->l_remote_handle = *(struct lustre_handle *)key;
2785 ldlm_export_lock_keycmp(const void *key, struct hlist_node *hnode)
2787 return lustre_handle_equal(ldlm_export_lock_key(hnode), key);
2791 ldlm_export_lock_object(struct hlist_node *hnode)
2793 return hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2797 ldlm_export_lock_get(struct cfs_hash *hs, struct hlist_node *hnode)
2799 struct ldlm_lock *lock;
2801 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2802 LDLM_LOCK_GET(lock);
2806 ldlm_export_lock_put(struct cfs_hash *hs, struct hlist_node *hnode)
2808 struct ldlm_lock *lock;
2810 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2811 LDLM_LOCK_RELEASE(lock);
2814 static struct cfs_hash_ops ldlm_export_lock_ops = {
2815 .hs_hash = ldlm_export_lock_hash,
2816 .hs_key = ldlm_export_lock_key,
2817 .hs_keycmp = ldlm_export_lock_keycmp,
2818 .hs_keycpy = ldlm_export_lock_keycpy,
2819 .hs_object = ldlm_export_lock_object,
2820 .hs_get = ldlm_export_lock_get,
2821 .hs_put = ldlm_export_lock_put,
2822 .hs_put_locked = ldlm_export_lock_put,
2825 int ldlm_init_export(struct obd_export *exp)
2830 exp->exp_lock_hash =
2831 cfs_hash_create(obd_uuid2str(&exp->exp_client_uuid),
2832 HASH_EXP_LOCK_CUR_BITS,
2833 HASH_EXP_LOCK_MAX_BITS,
2834 HASH_EXP_LOCK_BKT_BITS, 0,
2835 CFS_HASH_MIN_THETA, CFS_HASH_MAX_THETA,
2836 &ldlm_export_lock_ops,
2837 CFS_HASH_DEFAULT | CFS_HASH_REHASH_KEY |
2838 CFS_HASH_NBLK_CHANGE);
2840 if (!exp->exp_lock_hash)
2843 rc = ldlm_init_flock_export(exp);
2849 ldlm_destroy_export(exp);
2852 EXPORT_SYMBOL(ldlm_init_export);
2854 void ldlm_destroy_export(struct obd_export *exp)
2857 cfs_hash_putref(exp->exp_lock_hash);
2858 exp->exp_lock_hash = NULL;
2860 ldlm_destroy_flock_export(exp);
2863 EXPORT_SYMBOL(ldlm_destroy_export);
2865 static ssize_t cancel_unused_locks_before_replay_show(struct kobject *kobj,
2866 struct attribute *attr,
2869 return sprintf(buf, "%d\n", ldlm_cancel_unused_locks_before_replay);
2872 static ssize_t cancel_unused_locks_before_replay_store(struct kobject *kobj,
2873 struct attribute *attr,
2880 rc = kstrtoul(buffer, 10, &val);
2884 ldlm_cancel_unused_locks_before_replay = val;
2888 LUSTRE_RW_ATTR(cancel_unused_locks_before_replay);
2890 static struct attribute *ldlm_attrs[] = {
2891 &lustre_attr_cancel_unused_locks_before_replay.attr,
2895 static struct attribute_group ldlm_attr_group = {
2896 .attrs = ldlm_attrs,
2899 static int ldlm_setup(void)
2901 static struct ptlrpc_service_conf conf;
2902 struct ldlm_bl_pool *blp = NULL;
2903 #ifdef HAVE_SERVER_SUPPORT
2904 struct task_struct *task;
2905 #endif /* HAVE_SERVER_SUPPORT */
2911 if (ldlm_state != NULL)
2914 OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
2915 if (ldlm_state == NULL)
2918 ldlm_kobj = kobject_create_and_add("ldlm", &lustre_kset->kobj);
2922 rc = sysfs_create_group(ldlm_kobj, &ldlm_attr_group);
2926 ldlm_ns_kset = kset_create_and_add("namespaces", NULL, ldlm_kobj);
2930 ldlm_svc_kset = kset_create_and_add("services", NULL, ldlm_kobj);
2934 rc = ldlm_debugfs_setup();
2938 memset(&conf, 0, sizeof(conf));
2939 conf = (typeof(conf)) {
2940 .psc_name = "ldlm_cbd",
2941 .psc_watchdog_factor = 2,
2943 .bc_nbufs = LDLM_CLIENT_NBUFS,
2944 .bc_buf_size = LDLM_BUFSIZE,
2945 .bc_req_max_size = LDLM_MAXREQSIZE,
2946 .bc_rep_max_size = LDLM_MAXREPSIZE,
2947 .bc_req_portal = LDLM_CB_REQUEST_PORTAL,
2948 .bc_rep_portal = LDLM_CB_REPLY_PORTAL,
2951 .tc_thr_name = "ldlm_cb",
2952 .tc_thr_factor = LDLM_THR_FACTOR,
2953 .tc_nthrs_init = LDLM_NTHRS_INIT,
2954 .tc_nthrs_base = LDLM_NTHRS_BASE,
2955 .tc_nthrs_max = LDLM_NTHRS_MAX,
2956 .tc_nthrs_user = ldlm_num_threads,
2957 .tc_cpu_affinity = 1,
2958 .tc_ctx_tags = LCT_MD_THREAD | LCT_DT_THREAD,
2961 .cc_pattern = ldlm_cpts,
2964 .so_req_handler = ldlm_callback_handler,
2967 ldlm_state->ldlm_cb_service = \
2968 ptlrpc_register_service(&conf, ldlm_svc_kset,
2969 ldlm_svc_debugfs_dir);
2970 if (IS_ERR(ldlm_state->ldlm_cb_service)) {
2971 CERROR("failed to start service\n");
2972 rc = PTR_ERR(ldlm_state->ldlm_cb_service);
2973 ldlm_state->ldlm_cb_service = NULL;
2977 #ifdef HAVE_SERVER_SUPPORT
2978 memset(&conf, 0, sizeof(conf));
2979 conf = (typeof(conf)) {
2980 .psc_name = "ldlm_canceld",
2981 .psc_watchdog_factor = 6,
2983 .bc_nbufs = LDLM_SERVER_NBUFS,
2984 .bc_buf_size = LDLM_BUFSIZE,
2985 .bc_req_max_size = LDLM_MAXREQSIZE,
2986 .bc_rep_max_size = LDLM_MAXREPSIZE,
2987 .bc_req_portal = LDLM_CANCEL_REQUEST_PORTAL,
2988 .bc_rep_portal = LDLM_CANCEL_REPLY_PORTAL,
2992 .tc_thr_name = "ldlm_cn",
2993 .tc_thr_factor = LDLM_THR_FACTOR,
2994 .tc_nthrs_init = LDLM_NTHRS_INIT,
2995 .tc_nthrs_base = LDLM_NTHRS_BASE,
2996 .tc_nthrs_max = LDLM_NTHRS_MAX,
2997 .tc_nthrs_user = ldlm_num_threads,
2998 .tc_cpu_affinity = 1,
2999 .tc_ctx_tags = LCT_MD_THREAD | \
3004 .cc_pattern = ldlm_cpts,
3007 .so_req_handler = ldlm_cancel_handler,
3008 .so_hpreq_handler = ldlm_hpreq_handler,
3011 ldlm_state->ldlm_cancel_service = \
3012 ptlrpc_register_service(&conf, ldlm_svc_kset,
3013 ldlm_svc_debugfs_dir);
3014 if (IS_ERR(ldlm_state->ldlm_cancel_service)) {
3015 CERROR("failed to start service\n");
3016 rc = PTR_ERR(ldlm_state->ldlm_cancel_service);
3017 ldlm_state->ldlm_cancel_service = NULL;
3020 #endif /* HAVE_SERVER_SUPPORT */
3022 OBD_ALLOC(blp, sizeof(*blp));
3024 GOTO(out, rc = -ENOMEM);
3025 ldlm_state->ldlm_bl_pool = blp;
3027 spin_lock_init(&blp->blp_lock);
3028 INIT_LIST_HEAD(&blp->blp_list);
3029 INIT_LIST_HEAD(&blp->blp_prio_list);
3030 init_waitqueue_head(&blp->blp_waitq);
3031 atomic_set(&blp->blp_num_threads, 0);
3032 atomic_set(&blp->blp_busy_threads, 0);
3034 if (ldlm_num_threads == 0) {
3035 blp->blp_min_threads = LDLM_NTHRS_INIT;
3036 blp->blp_max_threads = LDLM_NTHRS_MAX;
3038 blp->blp_min_threads = blp->blp_max_threads = \
3039 min_t(int, LDLM_NTHRS_MAX, max_t(int, LDLM_NTHRS_INIT,
3043 for (i = 0; i < blp->blp_min_threads; i++) {
3044 rc = ldlm_bl_thread_start(blp, false);
3049 #ifdef HAVE_SERVER_SUPPORT
3050 task = kthread_run(expired_lock_main, NULL, "ldlm_elt");
3053 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
3057 wait_event(expired_lock_wait_queue,
3058 expired_lock_thread_state == ELT_READY);
3059 #endif /* HAVE_SERVER_SUPPORT */
3061 rc = ldlm_pools_init();
3063 CERROR("Failed to initialize LDLM pools: %d\n", rc);
3067 rc = ldlm_reclaim_setup();
3069 CERROR("Failed to setup reclaim thread: rc = %d\n", rc);
3079 static int ldlm_cleanup(void)
3083 if (!list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) ||
3084 !list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) {
3085 CERROR("ldlm still has namespaces; clean these up first.\n");
3086 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
3087 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
3091 ldlm_reclaim_cleanup();
3094 if (ldlm_state->ldlm_bl_pool != NULL) {
3095 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
3097 while (atomic_read(&blp->blp_num_threads) > 0) {
3098 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
3100 init_completion(&blp->blp_comp);
3102 spin_lock(&blp->blp_lock);
3103 list_add_tail(&blwi.blwi_entry, &blp->blp_list);
3104 wake_up(&blp->blp_waitq);
3105 spin_unlock(&blp->blp_lock);
3107 wait_for_completion(&blp->blp_comp);
3110 OBD_FREE(blp, sizeof(*blp));
3113 if (ldlm_state->ldlm_cb_service != NULL)
3114 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
3115 #ifdef HAVE_SERVER_SUPPORT
3116 if (ldlm_state->ldlm_cancel_service != NULL)
3117 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
3121 kset_unregister(ldlm_ns_kset);
3123 kset_unregister(ldlm_svc_kset);
3125 sysfs_remove_group(ldlm_kobj, &ldlm_attr_group);
3126 kobject_put(ldlm_kobj);
3129 ldlm_debugfs_cleanup();
3131 #ifdef HAVE_SERVER_SUPPORT
3132 if (expired_lock_thread_state != ELT_STOPPED) {
3133 expired_lock_thread_state = ELT_TERMINATE;
3134 wake_up(&expired_lock_wait_queue);
3135 wait_event(expired_lock_wait_queue,
3136 expired_lock_thread_state == ELT_STOPPED);
3140 OBD_FREE(ldlm_state, sizeof(*ldlm_state));
3148 ldlm_resource_slab = kmem_cache_create("ldlm_resources",
3149 sizeof(struct ldlm_resource), 0,
3150 SLAB_HWCACHE_ALIGN, NULL);
3151 if (ldlm_resource_slab == NULL)
3154 ldlm_lock_slab = kmem_cache_create("ldlm_locks",
3155 sizeof(struct ldlm_lock), 0,
3156 SLAB_HWCACHE_ALIGN | SLAB_DESTROY_BY_RCU, NULL);
3157 if (ldlm_lock_slab == NULL)
3160 ldlm_interval_slab = kmem_cache_create("interval_node",
3161 sizeof(struct ldlm_interval),
3162 0, SLAB_HWCACHE_ALIGN, NULL);
3163 if (ldlm_interval_slab == NULL)
3166 ldlm_interval_tree_slab = kmem_cache_create("interval_tree",
3167 sizeof(struct ldlm_interval_tree) * LCK_MODE_NUM,
3168 0, SLAB_HWCACHE_ALIGN, NULL);
3169 if (ldlm_interval_tree_slab == NULL)
3172 #ifdef HAVE_SERVER_SUPPORT
3173 ldlm_glimpse_work_kmem = kmem_cache_create("ldlm_glimpse_work_kmem",
3174 sizeof(struct ldlm_glimpse_work),
3176 if (ldlm_glimpse_work_kmem == NULL)
3177 goto out_interval_tree;
3180 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3181 class_export_dump_hook = ldlm_dump_export_locks;
3184 #ifdef HAVE_SERVER_SUPPORT
3186 kmem_cache_destroy(ldlm_interval_tree_slab);
3189 kmem_cache_destroy(ldlm_interval_slab);
3191 kmem_cache_destroy(ldlm_lock_slab);
3193 kmem_cache_destroy(ldlm_resource_slab);
3198 void ldlm_exit(void)
3201 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
3202 kmem_cache_destroy(ldlm_resource_slab);
3203 /* ldlm_lock_put() use RCU to call ldlm_lock_free, so need call
3204 * synchronize_rcu() to wait a grace period elapsed, so that
3205 * ldlm_lock_free() get a chance to be called. */
3207 kmem_cache_destroy(ldlm_lock_slab);
3208 kmem_cache_destroy(ldlm_interval_slab);
3209 kmem_cache_destroy(ldlm_interval_tree_slab);
3210 #ifdef HAVE_SERVER_SUPPORT
3211 kmem_cache_destroy(ldlm_glimpse_work_kmem);