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, 2015, 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
44 #include <linux/kthread.h>
45 #include <linux/list.h>
46 #include <libcfs/libcfs.h>
47 #include <lustre_dlm.h>
48 #include <obd_class.h>
49 #include "ldlm_internal.h"
51 static int ldlm_num_threads;
52 module_param(ldlm_num_threads, int, 0444);
53 MODULE_PARM_DESC(ldlm_num_threads, "number of DLM service threads to start");
55 static char *ldlm_cpts;
56 module_param(ldlm_cpts, charp, 0444);
57 MODULE_PARM_DESC(ldlm_cpts, "CPU partitions ldlm threads should run on");
59 static struct mutex ldlm_ref_mutex;
60 static int ldlm_refcount;
62 struct ldlm_cb_async_args {
63 struct ldlm_cb_set_arg *ca_set_arg;
64 struct ldlm_lock *ca_lock;
69 static struct ldlm_state *ldlm_state;
71 static inline cfs_time_t round_timeout(cfs_time_t timeout)
73 return cfs_time_seconds((int)cfs_duration_sec(cfs_time_sub(timeout, 0)) + 1);
76 /* timeout for initial callback (AST) reply (bz10399) */
77 static inline unsigned int ldlm_get_rq_timeout(void)
80 unsigned int timeout = min(ldlm_timeout, obd_timeout / 3);
82 return timeout < 1 ? 1 : timeout;
87 #define ELT_TERMINATE 2
93 * blp_prio_list is used for callbacks that should be handled
94 * as a priority. It is used for LDLM_FL_DISCARD_DATA requests.
97 struct list_head blp_prio_list;
100 * blp_list is used for all other callbacks which are likely
101 * to take longer to process.
103 struct list_head blp_list;
105 wait_queue_head_t blp_waitq;
106 struct completion blp_comp;
107 atomic_t blp_num_threads;
108 atomic_t blp_busy_threads;
113 struct ldlm_bl_work_item {
114 struct list_head blwi_entry;
115 struct ldlm_namespace *blwi_ns;
116 struct ldlm_lock_desc blwi_ld;
117 struct ldlm_lock *blwi_lock;
118 struct list_head blwi_head;
120 struct completion blwi_comp;
121 enum ldlm_cancel_flags blwi_flags;
122 int blwi_mem_pressure;
125 #ifdef HAVE_SERVER_SUPPORT
128 * Protects both waiting_locks_list and expired_lock_thread.
130 static spinlock_t waiting_locks_spinlock; /* BH lock (timer) */
133 * List for contended locks.
135 * As soon as a lock is contended, it gets placed on this list and
136 * expected time to get a response is filled in the lock. A special
137 * thread walks the list looking for locks that should be released and
138 * schedules client evictions for those that have not been released in
141 * All access to it should be under waiting_locks_spinlock.
143 static struct list_head waiting_locks_list;
144 static struct timer_list waiting_locks_timer;
146 static struct expired_lock_thread {
147 wait_queue_head_t elt_waitq;
150 struct list_head elt_expired_locks;
151 } expired_lock_thread;
153 static inline int have_expired_locks(void)
158 spin_lock_bh(&waiting_locks_spinlock);
159 need_to_run = !list_empty(&expired_lock_thread.elt_expired_locks);
160 spin_unlock_bh(&waiting_locks_spinlock);
166 * Check expired lock list for expired locks and time them out.
168 static int expired_lock_main(void *arg)
170 struct list_head *expired = &expired_lock_thread.elt_expired_locks;
171 struct l_wait_info lwi = { 0 };
176 expired_lock_thread.elt_state = ELT_READY;
177 wake_up(&expired_lock_thread.elt_waitq);
180 l_wait_event(expired_lock_thread.elt_waitq,
181 have_expired_locks() ||
182 expired_lock_thread.elt_state == ELT_TERMINATE,
185 spin_lock_bh(&waiting_locks_spinlock);
186 if (expired_lock_thread.elt_dump) {
187 struct libcfs_debug_msg_data msgdata = {
188 .msg_file = __FILE__,
189 .msg_fn = "waiting_locks_callback",
190 .msg_line = expired_lock_thread.elt_dump };
191 spin_unlock_bh(&waiting_locks_spinlock);
193 /* from waiting_locks_callback, but not in timer */
194 libcfs_debug_dumplog();
195 libcfs_run_lbug_upcall(&msgdata);
197 spin_lock_bh(&waiting_locks_spinlock);
198 expired_lock_thread.elt_dump = 0;
203 while (!list_empty(expired)) {
204 struct obd_export *export;
205 struct ldlm_lock *lock;
207 lock = list_entry(expired->next, struct ldlm_lock,
209 if ((void *)lock < LP_POISON + PAGE_SIZE &&
210 (void *)lock >= LP_POISON) {
211 spin_unlock_bh(&waiting_locks_spinlock);
212 CERROR("free lock on elt list %p\n", lock);
215 list_del_init(&lock->l_pending_chain);
216 if ((void *)lock->l_export <
217 LP_POISON + PAGE_SIZE &&
218 (void *)lock->l_export >= LP_POISON) {
219 CERROR("lock with free export on elt list %p\n",
221 lock->l_export = NULL;
222 LDLM_ERROR(lock, "free export");
223 /* release extra ref grabbed by
224 * ldlm_add_waiting_lock() or
225 * ldlm_failed_ast() */
226 LDLM_LOCK_RELEASE(lock);
230 if (ldlm_is_destroyed(lock)) {
231 /* release the lock refcount where
232 * waiting_locks_callback() founds */
233 LDLM_LOCK_RELEASE(lock);
236 export = class_export_lock_get(lock->l_export, lock);
237 spin_unlock_bh(&waiting_locks_spinlock);
239 spin_lock_bh(&export->exp_bl_list_lock);
240 list_del_init(&lock->l_exp_list);
241 spin_unlock_bh(&export->exp_bl_list_lock);
244 class_fail_export(export);
245 class_export_lock_put(export, lock);
247 /* release extra ref grabbed by ldlm_add_waiting_lock()
248 * or ldlm_failed_ast() */
249 LDLM_LOCK_RELEASE(lock);
251 spin_lock_bh(&waiting_locks_spinlock);
253 spin_unlock_bh(&waiting_locks_spinlock);
255 if (do_dump && obd_dump_on_eviction) {
256 CERROR("dump the log upon eviction\n");
257 libcfs_debug_dumplog();
260 if (expired_lock_thread.elt_state == ELT_TERMINATE)
264 expired_lock_thread.elt_state = ELT_STOPPED;
265 wake_up(&expired_lock_thread.elt_waitq);
269 static int ldlm_add_waiting_lock(struct ldlm_lock *lock);
270 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, int seconds);
273 * Check if there is a request in the export request list
274 * which prevents the lock canceling.
276 static int ldlm_lock_busy(struct ldlm_lock *lock)
278 struct ptlrpc_request *req;
282 if (lock->l_export == NULL)
285 spin_lock_bh(&lock->l_export->exp_rpc_lock);
286 list_for_each_entry(req, &lock->l_export->exp_hp_rpcs,
288 if (req->rq_ops->hpreq_lock_match) {
289 match = req->rq_ops->hpreq_lock_match(req, lock);
294 spin_unlock_bh(&lock->l_export->exp_rpc_lock);
298 /* This is called from within a timer interrupt and cannot schedule */
299 static void waiting_locks_callback(unsigned long unused)
301 struct ldlm_lock *lock;
304 spin_lock_bh(&waiting_locks_spinlock);
305 while (!list_empty(&waiting_locks_list)) {
306 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
308 if (cfs_time_after(lock->l_callback_timeout,
309 cfs_time_current()) ||
310 (lock->l_req_mode == LCK_GROUP))
313 /* Check if we need to prolong timeout */
314 if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT) &&
315 ldlm_lock_busy(lock)) {
318 if (lock->l_pending_chain.next == &waiting_locks_list)
323 spin_unlock_bh(&waiting_locks_spinlock);
324 LDLM_DEBUG(lock, "prolong the busy lock");
325 ldlm_refresh_waiting_lock(lock,
326 ldlm_bl_timeout(lock) >> 1);
327 spin_lock_bh(&waiting_locks_spinlock);
330 LDLM_LOCK_RELEASE(lock);
334 LDLM_LOCK_RELEASE(lock);
337 ldlm_lock_to_ns(lock)->ns_timeouts++;
338 LDLM_ERROR(lock, "lock callback timer expired after %lds: "
339 "evicting client at %s ",
340 cfs_time_current_sec() - lock->l_last_activity,
342 lock->l_export->exp_connection->c_peer.nid));
344 /* no needs to take an extra ref on the lock since it was in
345 * the waiting_locks_list and ldlm_add_waiting_lock()
346 * already grabbed a ref */
347 list_del(&lock->l_pending_chain);
348 list_add(&lock->l_pending_chain,
349 &expired_lock_thread.elt_expired_locks);
353 if (!list_empty(&expired_lock_thread.elt_expired_locks)) {
354 if (obd_dump_on_timeout && need_dump)
355 expired_lock_thread.elt_dump = __LINE__;
357 wake_up(&expired_lock_thread.elt_waitq);
361 * Make sure the timer will fire again if we have any locks
364 if (!list_empty(&waiting_locks_list)) {
365 cfs_time_t timeout_rounded;
366 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
368 timeout_rounded = (cfs_time_t)round_timeout(lock->l_callback_timeout);
369 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
371 spin_unlock_bh(&waiting_locks_spinlock);
375 * Add lock to the list of contended locks.
377 * Indicate that we're waiting for a client to call us back cancelling a given
378 * lock. We add it to the pending-callback chain, and schedule the lock-timeout
379 * timer to fire appropriately. (We round up to the next second, to avoid
380 * floods of timer firings during periods of high lock contention and traffic).
381 * As done by ldlm_add_waiting_lock(), the caller must grab a lock reference
382 * if it has been added to the waiting list (1 is returned).
384 * Called with the namespace lock held.
386 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, int seconds)
389 cfs_time_t timeout_rounded;
391 if (!list_empty(&lock->l_pending_chain))
394 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT) ||
395 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
398 timeout = cfs_time_shift(seconds);
399 if (likely(cfs_time_after(timeout, lock->l_callback_timeout)))
400 lock->l_callback_timeout = timeout;
402 timeout_rounded = round_timeout(lock->l_callback_timeout);
404 if (cfs_time_before(timeout_rounded,
405 cfs_timer_deadline(&waiting_locks_timer)) ||
406 !cfs_timer_is_armed(&waiting_locks_timer)) {
407 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
409 /* if the new lock has a shorter timeout than something earlier on
410 the list, we'll wait the longer amount of time; no big deal. */
412 list_add_tail(&lock->l_pending_chain, &waiting_locks_list);
416 static void ldlm_add_blocked_lock(struct ldlm_lock *lock)
418 spin_lock_bh(&lock->l_export->exp_bl_list_lock);
419 if (list_empty(&lock->l_exp_list)) {
420 if (lock->l_granted_mode != lock->l_req_mode)
421 list_add_tail(&lock->l_exp_list,
422 &lock->l_export->exp_bl_list);
424 list_add(&lock->l_exp_list,
425 &lock->l_export->exp_bl_list);
427 spin_unlock_bh(&lock->l_export->exp_bl_list_lock);
429 /* A blocked lock is added. Adjust the position in
430 * the stale list if the export is in the list.
431 * If export is stale and not in the list - it is being
432 * processed and will be placed on the right position
433 * on obd_stale_export_put(). */
434 if (!list_empty(&lock->l_export->exp_stale_list))
435 obd_stale_export_adjust(lock->l_export);
438 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
441 int timeout = ldlm_bl_timeout(lock);
443 /* NB: must be called with hold of lock_res_and_lock() */
444 LASSERT(ldlm_is_res_locked(lock));
445 LASSERT(!ldlm_is_cancel_on_block(lock));
447 /* Do not put cross-MDT lock in the waiting list, since we
448 * will not evict it due to timeout for now */
449 if (lock->l_export != NULL &&
450 (exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS))
453 spin_lock_bh(&waiting_locks_spinlock);
454 if (ldlm_is_cancel(lock)) {
455 spin_unlock_bh(&waiting_locks_spinlock);
459 if (ldlm_is_destroyed(lock)) {
460 static cfs_time_t next;
462 spin_unlock_bh(&waiting_locks_spinlock);
463 LDLM_ERROR(lock, "not waiting on destroyed lock (bug 5653)");
464 if (cfs_time_after(cfs_time_current(), next)) {
465 next = cfs_time_shift(14400);
466 libcfs_debug_dumpstack(NULL);
471 ldlm_set_waited(lock);
472 lock->l_last_activity = cfs_time_current_sec();
473 ret = __ldlm_add_waiting_lock(lock, timeout);
475 /* grab ref on the lock if it has been added to the
479 spin_unlock_bh(&waiting_locks_spinlock);
482 ldlm_add_blocked_lock(lock);
484 LDLM_DEBUG(lock, "%sadding to wait list(timeout: %d, AT: %s)",
485 ret == 0 ? "not re-" : "", timeout,
486 AT_OFF ? "off" : "on");
491 * Remove a lock from the pending list, likely because it had its cancellation
492 * callback arrive without incident. This adjusts the lock-timeout timer if
493 * needed. Returns 0 if the lock wasn't pending after all, 1 if it was.
494 * As done by ldlm_del_waiting_lock(), the caller must release the lock
495 * reference when the lock is removed from any list (1 is returned).
497 * Called with namespace lock held.
499 static int __ldlm_del_waiting_lock(struct ldlm_lock *lock)
501 struct list_head *list_next;
503 if (list_empty(&lock->l_pending_chain))
506 list_next = lock->l_pending_chain.next;
507 if (lock->l_pending_chain.prev == &waiting_locks_list) {
508 /* Removing the head of the list, adjust timer. */
509 if (list_next == &waiting_locks_list) {
510 /* No more, just cancel. */
511 cfs_timer_disarm(&waiting_locks_timer);
513 struct ldlm_lock *next;
514 next = list_entry(list_next, struct ldlm_lock,
516 cfs_timer_arm(&waiting_locks_timer,
517 round_timeout(next->l_callback_timeout));
520 list_del_init(&lock->l_pending_chain);
525 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
529 if (lock->l_export == NULL) {
530 /* We don't have a "waiting locks list" on clients. */
531 CDEBUG(D_DLMTRACE, "Client lock %p : no-op\n", lock);
535 spin_lock_bh(&waiting_locks_spinlock);
536 ret = __ldlm_del_waiting_lock(lock);
537 ldlm_clear_waited(lock);
538 spin_unlock_bh(&waiting_locks_spinlock);
540 /* remove the lock out of export blocking list */
541 spin_lock_bh(&lock->l_export->exp_bl_list_lock);
542 list_del_init(&lock->l_exp_list);
543 spin_unlock_bh(&lock->l_export->exp_bl_list_lock);
546 /* release lock ref if it has indeed been removed
548 LDLM_LOCK_RELEASE(lock);
551 LDLM_DEBUG(lock, "%s", ret == 0 ? "wasn't waiting" : "removed");
556 * Prolong the contended lock waiting time.
558 * Called with namespace lock held.
560 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout)
562 if (lock->l_export == NULL) {
563 /* We don't have a "waiting locks list" on clients. */
564 LDLM_DEBUG(lock, "client lock: no-op");
568 if (exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS) {
569 /* We don't have a "waiting locks list" on OSP. */
570 LDLM_DEBUG(lock, "MDS-MDS lock: no-op");
574 spin_lock_bh(&waiting_locks_spinlock);
576 if (list_empty(&lock->l_pending_chain)) {
577 spin_unlock_bh(&waiting_locks_spinlock);
578 LDLM_DEBUG(lock, "wasn't waiting");
582 /* we remove/add the lock to the waiting list, so no needs to
583 * release/take a lock reference */
584 __ldlm_del_waiting_lock(lock);
585 __ldlm_add_waiting_lock(lock, timeout);
586 spin_unlock_bh(&waiting_locks_spinlock);
588 LDLM_DEBUG(lock, "refreshed");
591 EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
593 #else /* HAVE_SERVER_SUPPORT */
595 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
600 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout)
605 #endif /* !HAVE_SERVER_SUPPORT */
607 #ifdef HAVE_SERVER_SUPPORT
610 * Calculate the per-export Blocking timeout (covering BL AST, data flush,
611 * lock cancel, and their replies). Used for lock callback timeout and AST
614 * \param[in] lock lock which is getting the blocking callback
616 * \retval timeout in seconds to wait for the client reply
618 unsigned int ldlm_bl_timeout(struct ldlm_lock *lock)
620 unsigned int timeout;
623 return obd_timeout / 2;
625 /* Since these are non-updating timeouts, we should be conservative.
626 * Take more than usually, 150%
627 * It would be nice to have some kind of "early reply" mechanism for
628 * lock callbacks too... */
629 timeout = at_get(&lock->l_export->exp_bl_lock_at);
630 return max(timeout + (timeout >> 1), ldlm_enqueue_min);
632 EXPORT_SYMBOL(ldlm_bl_timeout);
635 * Perform lock cleanup if AST sending failed.
637 static void ldlm_failed_ast(struct ldlm_lock *lock, int rc,
638 const char *ast_type)
640 LCONSOLE_ERROR_MSG(0x138, "%s: A client on nid %s was evicted due "
641 "to a lock %s callback time out: rc %d\n",
642 lock->l_export->exp_obd->obd_name,
643 obd_export_nid2str(lock->l_export), ast_type, rc);
645 if (obd_dump_on_timeout)
646 libcfs_debug_dumplog();
647 spin_lock_bh(&waiting_locks_spinlock);
648 if (__ldlm_del_waiting_lock(lock) == 0)
649 /* the lock was not in any list, grab an extra ref before adding
650 * the lock to the expired list */
652 list_add(&lock->l_pending_chain,
653 &expired_lock_thread.elt_expired_locks);
654 wake_up(&expired_lock_thread.elt_waitq);
655 spin_unlock_bh(&waiting_locks_spinlock);
659 * Perform lock cleanup if AST reply came with error.
661 static int ldlm_handle_ast_error(struct ldlm_lock *lock,
662 struct ptlrpc_request *req, int rc,
663 const char *ast_type)
665 lnet_process_id_t peer = req->rq_import->imp_connection->c_peer;
667 if (!req->rq_replied || (rc && rc != -EINVAL)) {
668 if (lock->l_export && lock->l_export->exp_libclient) {
670 "%s AST (req@%p x%llu) to liblustre client (nid %s) timeout, just cancelling lock",
671 ast_type, req, req->rq_xid,
672 libcfs_nid2str(peer.nid));
673 ldlm_lock_cancel(lock);
675 } else if (ldlm_is_cancel(lock)) {
677 "%s AST (req@%p x%llu) timeout from nid %s, but cancel was received (AST reply lost?)",
678 ast_type, req, req->rq_xid,
679 libcfs_nid2str(peer.nid));
680 ldlm_lock_cancel(lock);
684 "client (nid %s) %s %s AST (req@%p x%llu status %d rc %d), evict it",
685 libcfs_nid2str(peer.nid),
686 req->rq_replied ? "returned error from" :
687 "failed to reply to",
688 ast_type, req, req->rq_xid,
689 (req->rq_repmsg != NULL) ?
690 lustre_msg_get_status(req->rq_repmsg) : 0,
692 ldlm_failed_ast(lock, rc, ast_type);
698 struct ldlm_resource *res = lock->l_resource;
701 "client (nid %s) returned %d from %s AST (req@%p x%llu) - normal race",
702 libcfs_nid2str(peer.nid),
704 lustre_msg_get_status(req->rq_repmsg) : -1,
705 ast_type, req, req->rq_xid);
707 /* update lvbo to return proper attributes.
709 ldlm_resource_getref(res);
710 ldlm_res_lvbo_update(res, NULL, 1);
711 ldlm_resource_putref(res);
713 ldlm_lock_cancel(lock);
720 static int ldlm_cb_interpret(const struct lu_env *env,
721 struct ptlrpc_request *req, void *data, int rc)
723 struct ldlm_cb_async_args *ca = data;
724 struct ldlm_lock *lock = ca->ca_lock;
725 struct ldlm_cb_set_arg *arg = ca->ca_set_arg;
728 LASSERT(lock != NULL);
731 case LDLM_GL_CALLBACK:
732 /* Update the LVB from disk if the AST failed
733 * (this is a legal race)
735 * - Glimpse callback of local lock just returns
736 * -ELDLM_NO_LOCK_DATA.
737 * - Glimpse callback of remote lock might return
738 * -ELDLM_NO_LOCK_DATA when inode is cleared. LU-274
740 if (rc == -ELDLM_NO_LOCK_DATA) {
741 LDLM_DEBUG(lock, "lost race - client has a lock but no "
743 ldlm_res_lvbo_update(lock->l_resource, NULL, 1);
744 } else if (rc != 0) {
745 rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
747 rc = ldlm_res_lvbo_update(lock->l_resource, req, 1);
750 case LDLM_BL_CALLBACK:
752 rc = ldlm_handle_ast_error(lock, req, rc, "blocking");
754 case LDLM_CP_CALLBACK:
756 rc = ldlm_handle_ast_error(lock, req, rc, "completion");
759 LDLM_ERROR(lock, "invalid opcode for lock callback %d",
764 /* release extra reference taken in ldlm_ast_fini() */
765 LDLM_LOCK_RELEASE(lock);
768 atomic_inc(&arg->restart);
773 static void ldlm_update_resend(struct ptlrpc_request *req, void *data)
775 struct ldlm_cb_async_args *ca = data;
776 struct ldlm_lock *lock = ca->ca_lock;
778 ldlm_refresh_waiting_lock(lock, ldlm_bl_timeout(lock));
781 static inline int ldlm_ast_fini(struct ptlrpc_request *req,
782 struct ldlm_cb_set_arg *arg,
783 struct ldlm_lock *lock,
789 if (unlikely(instant_cancel)) {
790 rc = ptl_send_rpc(req, 1);
791 ptlrpc_req_finished(req);
793 atomic_inc(&arg->restart);
796 ptlrpc_set_add_req(arg->set, req);
803 * Check if there are requests in the export request list which prevent
804 * the lock canceling and make these requests high priority ones.
806 static void ldlm_lock_reorder_req(struct ldlm_lock *lock)
808 struct ptlrpc_request *req;
811 if (lock->l_export == NULL) {
812 LDLM_DEBUG(lock, "client lock: no-op");
816 spin_lock_bh(&lock->l_export->exp_rpc_lock);
817 list_for_each_entry(req, &lock->l_export->exp_hp_rpcs,
819 /* Do not process requests that were not yet added to there
820 * incoming queue or were already removed from there for
821 * processing. We evaluate ptlrpc_nrs_req_can_move() without
822 * holding svcpt->scp_req_lock, and then redo the check with
823 * the lock held once we need to obtain a reliable result.
825 if (ptlrpc_nrs_req_can_move(req) &&
826 req->rq_ops->hpreq_lock_match &&
827 req->rq_ops->hpreq_lock_match(req, lock))
828 ptlrpc_nrs_req_hp_move(req);
830 spin_unlock_bh(&lock->l_export->exp_rpc_lock);
835 * ->l_blocking_ast() method for server-side locks. This is invoked when newly
836 * enqueued server lock conflicts with given one.
838 * Sends blocking AST RPC to the client owning that lock; arms timeout timer
839 * to wait for client response.
841 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
842 struct ldlm_lock_desc *desc,
843 void *data, int flag)
845 struct ldlm_cb_async_args *ca;
846 struct ldlm_cb_set_arg *arg = data;
847 struct ldlm_request *body;
848 struct ptlrpc_request *req;
849 int instant_cancel = 0;
853 if (flag == LDLM_CB_CANCELING)
854 /* Don't need to do anything here. */
858 LASSERT(data != NULL);
859 if (lock->l_export->exp_obd->obd_recovering != 0)
860 LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
862 ldlm_lock_reorder_req(lock);
864 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
865 &RQF_LDLM_BL_CALLBACK,
866 LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK);
870 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
871 ca = ptlrpc_req_async_args(req);
872 ca->ca_set_arg = arg;
875 req->rq_interpret_reply = ldlm_cb_interpret;
877 lock_res_and_lock(lock);
878 if (ldlm_is_destroyed(lock)) {
879 /* What's the point? */
880 unlock_res_and_lock(lock);
881 ptlrpc_req_finished(req);
885 if (lock->l_granted_mode != lock->l_req_mode) {
886 /* this blocking AST will be communicated as part of the
887 * completion AST instead */
888 ldlm_add_blocked_lock(lock);
889 ldlm_set_waited(lock);
890 unlock_res_and_lock(lock);
892 ptlrpc_req_finished(req);
893 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
897 if (ldlm_is_cancel_on_block(lock))
900 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
901 body->lock_handle[0] = lock->l_remote_handle;
902 body->lock_desc = *desc;
903 body->lock_flags |= ldlm_flags_to_wire(lock->l_flags & LDLM_FL_AST_MASK);
905 LDLM_DEBUG(lock, "server preparing blocking AST");
907 ptlrpc_request_set_replen(req);
908 ldlm_set_cbpending(lock);
909 if (instant_cancel) {
910 unlock_res_and_lock(lock);
911 ldlm_lock_cancel(lock);
913 req->rq_no_resend = 1;
915 LASSERT(lock->l_granted_mode == lock->l_req_mode);
916 ldlm_add_waiting_lock(lock);
917 unlock_res_and_lock(lock);
919 /* Do not resend after lock callback timeout */
920 req->rq_delay_limit = ldlm_bl_timeout(lock);
921 req->rq_resend_cb = ldlm_update_resend;
924 req->rq_send_state = LUSTRE_IMP_FULL;
925 /* ptlrpc_request_alloc_pack already set timeout */
927 req->rq_timeout = ldlm_get_rq_timeout();
929 lock->l_last_activity = cfs_time_current_sec();
931 if (lock->l_export && lock->l_export->exp_nid_stats &&
932 lock->l_export->exp_nid_stats->nid_ldlm_stats)
933 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
934 LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
936 rc = ldlm_ast_fini(req, arg, lock, instant_cancel);
942 * ->l_completion_ast callback for a remote lock in server namespace.
944 * Sends AST to the client notifying it of lock granting. If initial
945 * lock response was not sent yet, instead of sending another RPC, just
946 * mark the lock as granted and client will understand
948 int ldlm_server_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data)
950 struct ldlm_cb_set_arg *arg = data;
951 struct ldlm_request *body;
952 struct ptlrpc_request *req;
953 struct ldlm_cb_async_args *ca;
954 int instant_cancel = 0;
959 LASSERT(lock != NULL);
960 LASSERT(data != NULL);
962 if (OBD_FAIL_PRECHECK(OBD_FAIL_LDLM_SRV_CP_AST)) {
963 LDLM_DEBUG(lock, "dropping CP AST");
967 req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse,
968 &RQF_LDLM_CP_CALLBACK);
972 /* server namespace, doesn't need lock */
973 lvb_len = ldlm_lvbo_size(lock);
974 /* LU-3124 & LU-2187: to not return layout in completion AST because
975 * it may deadlock for LU-2187, or client may not have enough space
976 * for large layout. The layout will be returned to client with an
977 * extra RPC to fetch xattr.lov */
978 if (ldlm_has_layout(lock))
981 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT, lvb_len);
982 rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK);
984 ptlrpc_request_free(req);
988 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
989 ca = ptlrpc_req_async_args(req);
990 ca->ca_set_arg = arg;
993 req->rq_interpret_reply = ldlm_cb_interpret;
994 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
996 body->lock_handle[0] = lock->l_remote_handle;
997 body->lock_flags = ldlm_flags_to_wire(flags);
998 ldlm_lock2desc(lock, &body->lock_desc);
1000 void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB);
1002 lvb_len = ldlm_lvbo_fill(lock, lvb, lvb_len);
1004 /* We still need to send the RPC to wake up the blocked
1005 * enqueue thread on the client.
1007 * Consider old client, there is no better way to notify
1008 * the failure, just zero-sized the LVB, then the client
1009 * will fail out as "-EPROTO". */
1010 req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, 0,
1014 req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, lvb_len,
1019 lock->l_last_activity = cfs_time_current_sec();
1021 LDLM_DEBUG(lock, "server preparing completion AST");
1023 ptlrpc_request_set_replen(req);
1025 req->rq_send_state = LUSTRE_IMP_FULL;
1026 /* ptlrpc_request_pack already set timeout */
1028 req->rq_timeout = ldlm_get_rq_timeout();
1030 /* We only send real blocking ASTs after the lock is granted */
1031 lock_res_and_lock(lock);
1032 if (ldlm_is_ast_sent(lock)) {
1033 body->lock_flags |= ldlm_flags_to_wire(LDLM_FL_AST_SENT);
1034 /* Copy AST flags like LDLM_FL_DISCARD_DATA. */
1035 body->lock_flags |= ldlm_flags_to_wire(lock->l_flags &
1038 /* We might get here prior to ldlm_handle_enqueue setting
1039 * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
1040 * into waiting list, but this is safe and similar code in
1041 * ldlm_handle_enqueue will call ldlm_lock_cancel() still,
1042 * that would not only cancel the lock, but will also remove
1043 * it from waiting list */
1044 if (ldlm_is_cancel_on_block(lock)) {
1045 unlock_res_and_lock(lock);
1046 ldlm_lock_cancel(lock);
1049 req->rq_no_resend = 1;
1051 lock_res_and_lock(lock);
1053 /* start the lock-timeout clock */
1054 ldlm_add_waiting_lock(lock);
1055 /* Do not resend after lock callback timeout */
1056 req->rq_delay_limit = ldlm_bl_timeout(lock);
1057 req->rq_resend_cb = ldlm_update_resend;
1060 unlock_res_and_lock(lock);
1062 if (lock->l_export && lock->l_export->exp_nid_stats &&
1063 lock->l_export->exp_nid_stats->nid_ldlm_stats)
1064 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
1065 LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
1067 rc = ldlm_ast_fini(req, arg, lock, instant_cancel);
1069 RETURN(lvb_len < 0 ? lvb_len : rc);
1073 * Server side ->l_glimpse_ast handler for client locks.
1075 * Sends glimpse AST to the client and waits for reply. Then updates
1076 * lvbo with the result.
1078 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
1080 struct ldlm_cb_set_arg *arg = data;
1081 struct ldlm_request *body;
1082 struct ptlrpc_request *req;
1083 struct ldlm_cb_async_args *ca;
1085 struct req_format *req_fmt;
1088 LASSERT(lock != NULL);
1090 if (arg->gl_desc != NULL)
1091 /* There is a glimpse descriptor to pack */
1092 req_fmt = &RQF_LDLM_GL_DESC_CALLBACK;
1094 req_fmt = &RQF_LDLM_GL_CALLBACK;
1096 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
1097 req_fmt, LUSTRE_DLM_VERSION,
1103 if (arg->gl_desc != NULL) {
1104 /* copy the GL descriptor */
1105 union ldlm_gl_desc *desc;
1106 desc = req_capsule_client_get(&req->rq_pill, &RMF_DLM_GL_DESC);
1107 *desc = *arg->gl_desc;
1110 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1111 body->lock_handle[0] = lock->l_remote_handle;
1112 ldlm_lock2desc(lock, &body->lock_desc);
1114 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
1115 ca = ptlrpc_req_async_args(req);
1116 ca->ca_set_arg = arg;
1119 /* server namespace, doesn't need lock */
1120 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
1121 ldlm_lvbo_size(lock));
1122 ptlrpc_request_set_replen(req);
1124 req->rq_send_state = LUSTRE_IMP_FULL;
1125 /* ptlrpc_request_alloc_pack already set timeout */
1127 req->rq_timeout = ldlm_get_rq_timeout();
1129 lock->l_last_activity = cfs_time_current_sec();
1131 req->rq_interpret_reply = ldlm_cb_interpret;
1133 if (lock->l_export && lock->l_export->exp_nid_stats &&
1134 lock->l_export->exp_nid_stats->nid_ldlm_stats)
1135 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
1136 LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
1138 rc = ldlm_ast_fini(req, arg, lock, 0);
1143 int ldlm_glimpse_locks(struct ldlm_resource *res,
1144 struct list_head *gl_work_list)
1149 rc = ldlm_run_ast_work(ldlm_res_to_ns(res), gl_work_list,
1151 if (rc == -ERESTART)
1152 ldlm_reprocess_all(res);
1156 EXPORT_SYMBOL(ldlm_glimpse_locks);
1158 /* return LDLM lock associated with a lock callback request */
1159 struct ldlm_lock *ldlm_request_lock(struct ptlrpc_request *req)
1161 struct ldlm_cb_async_args *ca;
1162 struct ldlm_lock *lock;
1165 ca = ptlrpc_req_async_args(req);
1168 RETURN(ERR_PTR(-EFAULT));
1172 EXPORT_SYMBOL(ldlm_request_lock);
1174 static void ldlm_svc_get_eopc(const struct ldlm_request *dlm_req,
1175 struct lprocfs_stats *srv_stats)
1177 int lock_type = 0, op = 0;
1179 lock_type = dlm_req->lock_desc.l_resource.lr_type;
1181 switch (lock_type) {
1183 op = PTLRPC_LAST_CNTR + LDLM_PLAIN_ENQUEUE;
1186 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT)
1187 op = PTLRPC_LAST_CNTR + LDLM_GLIMPSE_ENQUEUE;
1189 op = PTLRPC_LAST_CNTR + LDLM_EXTENT_ENQUEUE;
1192 op = PTLRPC_LAST_CNTR + LDLM_FLOCK_ENQUEUE;
1195 op = PTLRPC_LAST_CNTR + LDLM_IBITS_ENQUEUE;
1203 lprocfs_counter_incr(srv_stats, op);
1209 * Main server-side entry point into LDLM for enqueue. This is called by ptlrpc
1210 * service threads to carry out client lock enqueueing requests.
1212 int ldlm_handle_enqueue0(struct ldlm_namespace *ns,
1213 struct ptlrpc_request *req,
1214 const struct ldlm_request *dlm_req,
1215 const struct ldlm_callback_suite *cbs)
1217 struct ldlm_reply *dlm_rep;
1219 enum ldlm_error err = ELDLM_OK;
1220 struct ldlm_lock *lock = NULL;
1221 void *cookie = NULL;
1223 struct ldlm_resource *res = NULL;
1226 LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
1228 ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF, LATF_SKIP);
1229 flags = ldlm_flags_from_wire(dlm_req->lock_flags);
1231 LASSERT(req->rq_export);
1233 if (ptlrpc_req2svc(req)->srv_stats != NULL)
1234 ldlm_svc_get_eopc(dlm_req, ptlrpc_req2svc(req)->srv_stats);
1236 if (req->rq_export && req->rq_export->exp_nid_stats &&
1237 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1238 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1239 LDLM_ENQUEUE - LDLM_FIRST_OPC);
1241 if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE ||
1242 dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) {
1243 DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
1244 dlm_req->lock_desc.l_resource.lr_type);
1245 GOTO(out, rc = -EFAULT);
1248 if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE ||
1249 dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE ||
1250 dlm_req->lock_desc.l_req_mode &
1251 (dlm_req->lock_desc.l_req_mode-1))) {
1252 DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
1253 dlm_req->lock_desc.l_req_mode);
1254 GOTO(out, rc = -EFAULT);
1257 if (exp_connect_flags(req->rq_export) & OBD_CONNECT_IBITS) {
1258 if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1260 DEBUG_REQ(D_ERROR, req,
1261 "PLAIN lock request from IBITS client?");
1262 GOTO(out, rc = -EPROTO);
1264 } else if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1266 DEBUG_REQ(D_ERROR, req,
1267 "IBITS lock request from unaware client?");
1268 GOTO(out, rc = -EPROTO);
1271 if (unlikely((flags & LDLM_FL_REPLAY) ||
1272 (lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))) {
1273 /* Find an existing lock in the per-export lock hash */
1274 /* In the function below, .hs_keycmp resolves to
1275 * ldlm_export_lock_keycmp() */
1276 /* coverity[overrun-buffer-val] */
1277 lock = cfs_hash_lookup(req->rq_export->exp_lock_hash,
1278 (void *)&dlm_req->lock_handle[0]);
1280 DEBUG_REQ(D_DLMTRACE, req, "found existing lock cookie %#llx",
1281 lock->l_handle.h_cookie);
1282 flags |= LDLM_FL_RESENT;
1283 GOTO(existing_lock, rc = 0);
1286 if (ldlm_reclaim_full()) {
1287 DEBUG_REQ(D_DLMTRACE, req, "Too many granted locks, "
1288 "reject current enqueue request and let the "
1289 "client retry later.\n");
1290 GOTO(out, rc = -EINPROGRESS);
1294 /* The lock's callback data might be set in the policy function */
1295 lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
1296 dlm_req->lock_desc.l_resource.lr_type,
1297 dlm_req->lock_desc.l_req_mode,
1298 cbs, NULL, 0, LVB_T_NONE);
1305 lock->l_remote_handle = dlm_req->lock_handle[0];
1306 LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
1308 /* Initialize resource lvb but not for a lock being replayed since
1309 * Client already got lvb sent in this case.
1310 * This must occur early since some policy methods assume resource
1311 * lvb is available (lr_lvb_data != NULL).
1313 res = lock->l_resource;
1314 if (!(flags & LDLM_FL_REPLAY)) {
1315 /* non-replayed lock, delayed lvb init may need to be done */
1316 rc = ldlm_lvbo_init(res);
1318 LDLM_DEBUG(lock, "delayed lvb init failed (rc %d)", rc);
1323 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
1324 /* Don't enqueue a lock onto the export if it is been disonnected
1325 * due to eviction (bug 3822) or server umount (bug 24324).
1326 * Cancel it now instead. */
1327 if (req->rq_export->exp_disconnected) {
1328 LDLM_ERROR(lock, "lock on disconnected export %p",
1330 GOTO(out, rc = -ENOTCONN);
1333 lock->l_export = class_export_lock_get(req->rq_export, lock);
1334 if (lock->l_export->exp_lock_hash)
1335 cfs_hash_add(lock->l_export->exp_lock_hash,
1336 &lock->l_remote_handle,
1339 /* Inherit the enqueue flags before the operation, because we do not
1340 * keep the res lock on return and next operations (BL AST) may proceed
1342 lock->l_flags |= ldlm_flags_from_wire(dlm_req->lock_flags &
1343 LDLM_FL_INHERIT_MASK);
1345 ldlm_convert_policy_to_local(req->rq_export,
1346 dlm_req->lock_desc.l_resource.lr_type,
1347 &dlm_req->lock_desc.l_policy_data,
1348 &lock->l_policy_data);
1349 if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
1350 lock->l_req_extent = lock->l_policy_data.l_extent;
1354 if (flags & LDLM_FL_HAS_INTENT) {
1355 /* In this case, the reply buffer is allocated deep in
1356 * local_lock_enqueue by the policy function. */
1359 /* based on the assumption that lvb size never changes during
1360 * resource life time otherwise it need resource->lr_lock's
1362 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
1363 RCL_SERVER, ldlm_lvbo_size(lock));
1365 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
1366 GOTO(out, rc = -ENOMEM);
1368 rc = req_capsule_server_pack(&req->rq_pill);
1373 err = ldlm_lock_enqueue(ns, &lock, cookie, &flags);
1380 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1382 ldlm_lock2desc(lock, &dlm_rep->lock_desc);
1383 ldlm_lock2handle(lock, &dlm_rep->lock_handle);
1385 if (lock && lock->l_resource->lr_type == LDLM_EXTENT)
1386 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_BL_EVICT, 6);
1388 /* We never send a blocking AST until the lock is granted, but
1389 * we can tell it right now */
1390 lock_res_and_lock(lock);
1392 /* Now take into account flags to be inherited from original lock
1393 request both in reply to client and in our own lock flags. */
1394 dlm_rep->lock_flags = ldlm_flags_to_wire(flags);
1395 lock->l_flags |= flags & LDLM_FL_INHERIT_MASK;
1397 /* Don't move a pending lock onto the export if it has already been
1398 * disconnected due to eviction (bug 5683) or server umount (bug 24324).
1399 * Cancel it now instead. */
1400 if (unlikely(req->rq_export->exp_disconnected ||
1401 OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
1402 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1404 } else if (ldlm_is_ast_sent(lock)) {
1405 dlm_rep->lock_flags |= ldlm_flags_to_wire(LDLM_FL_AST_SENT);
1406 if (lock->l_granted_mode == lock->l_req_mode) {
1408 * Only cancel lock if it was granted, because it would
1409 * be destroyed immediately and would never be granted
1410 * in the future, causing timeouts on client. Not
1411 * granted lock will be cancelled immediately after
1412 * sending completion AST.
1414 if (dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1415 unlock_res_and_lock(lock);
1416 ldlm_lock_cancel(lock);
1417 lock_res_and_lock(lock);
1419 ldlm_add_waiting_lock(lock);
1422 /* Make sure we never ever grant usual metadata locks to liblustre
1424 if ((dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN ||
1425 dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) &&
1426 req->rq_export->exp_libclient) {
1427 if (unlikely(!ldlm_is_cancel_on_block(lock) ||
1428 !(dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK))){
1429 CERROR("Granting sync lock to libclient. "
1430 "req fl %d, rep fl %d, lock fl %#llx\n",
1431 dlm_req->lock_flags, dlm_rep->lock_flags,
1433 LDLM_ERROR(lock, "sync lock");
1434 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT) {
1435 struct ldlm_intent *it;
1437 it = req_capsule_client_get(&req->rq_pill,
1440 CERROR("This is intent %s (%llu)\n",
1441 ldlm_it2str(it->opc), it->opc);
1447 unlock_res_and_lock(lock);
1451 req->rq_status = rc ?: err; /* return either error - bug 11190 */
1452 if (!req->rq_packed_final) {
1453 err = lustre_pack_reply(req, 1, NULL, NULL);
1458 /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
1459 * ldlm_reprocess_all. If this moves, revisit that code. -phil */
1461 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
1462 "(err=%d, rc=%d)", err, rc);
1465 if (req_capsule_has_field(&req->rq_pill, &RMF_DLM_LVB,
1467 ldlm_lvbo_size(lock) > 0) {
1471 buf = req_capsule_server_get(&req->rq_pill,
1473 LASSERTF(buf != NULL, "req %p, lock %p\n",
1475 buflen = req_capsule_get_size(&req->rq_pill,
1476 &RMF_DLM_LVB, RCL_SERVER);
1477 /* non-replayed lock, delayed lvb init may
1478 * need to be occur now */
1479 if ((buflen > 0) && !(flags & LDLM_FL_REPLAY)) {
1480 buflen = ldlm_lvbo_fill(lock, buf,
1486 buflen, RCL_SERVER);
1489 } else if (flags & LDLM_FL_REPLAY) {
1490 /* no LVB resend upon replay */
1504 if (rc != 0 && !(flags & LDLM_FL_RESENT)) {
1505 if (lock->l_export) {
1506 ldlm_lock_cancel(lock);
1508 lock_res_and_lock(lock);
1509 ldlm_resource_unlink_lock(lock);
1510 ldlm_lock_destroy_nolock(lock);
1511 unlock_res_and_lock(lock);
1516 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
1517 ldlm_reprocess_all(lock->l_resource);
1519 LDLM_LOCK_RELEASE(lock);
1522 LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
1529 * Old-style LDLM main entry point for server code enqueue.
1531 int ldlm_handle_enqueue(struct ptlrpc_request *req,
1532 ldlm_completion_callback completion_callback,
1533 ldlm_blocking_callback blocking_callback,
1534 ldlm_glimpse_callback glimpse_callback)
1536 struct ldlm_request *dlm_req;
1537 struct ldlm_callback_suite cbs = {
1538 .lcs_completion = completion_callback,
1539 .lcs_blocking = blocking_callback,
1540 .lcs_glimpse = glimpse_callback
1544 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1545 if (dlm_req != NULL) {
1546 rc = ldlm_handle_enqueue0(req->rq_export->exp_obd->obd_namespace,
1547 req, dlm_req, &cbs);
1555 * Main LDLM entry point for server code to process lock conversion requests.
1557 int ldlm_handle_convert0(struct ptlrpc_request *req,
1558 const struct ldlm_request *dlm_req)
1560 struct ldlm_reply *dlm_rep;
1561 struct ldlm_lock *lock;
1565 if (req->rq_export && req->rq_export->exp_nid_stats &&
1566 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1567 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1568 LDLM_CONVERT - LDLM_FIRST_OPC);
1570 rc = req_capsule_server_pack(&req->rq_pill);
1574 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1575 dlm_rep->lock_flags = dlm_req->lock_flags;
1577 lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
1579 req->rq_status = LUSTRE_EINVAL;
1583 LDLM_DEBUG(lock, "server-side convert handler START");
1585 res = ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
1586 &dlm_rep->lock_flags);
1588 if (ldlm_del_waiting_lock(lock))
1589 LDLM_DEBUG(lock, "converted waiting lock");
1592 req->rq_status = LUSTRE_EDEADLK;
1597 if (!req->rq_status)
1598 ldlm_reprocess_all(lock->l_resource);
1599 LDLM_DEBUG(lock, "server-side convert handler END");
1600 LDLM_LOCK_PUT(lock);
1602 LDLM_DEBUG_NOLOCK("server-side convert handler END");
1608 * Old-style main LDLM entry point for server code to process lock conversion
1611 int ldlm_handle_convert(struct ptlrpc_request *req)
1614 struct ldlm_request *dlm_req;
1616 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1617 if (dlm_req != NULL) {
1618 rc = ldlm_handle_convert0(req, dlm_req);
1620 CERROR ("Can't unpack dlm_req\n");
1627 * Cancel all the locks whose handles are packed into ldlm_request
1629 * Called by server code expecting such combined cancel activity
1632 int ldlm_request_cancel(struct ptlrpc_request *req,
1633 const struct ldlm_request *dlm_req,
1634 int first, enum lustre_at_flags flags)
1636 struct ldlm_resource *res, *pres = NULL;
1637 struct ldlm_lock *lock;
1638 int i, count, done = 0;
1641 count = dlm_req->lock_count ? dlm_req->lock_count : 1;
1645 if (count == 1 && dlm_req->lock_handle[0].cookie == 0)
1648 /* There is no lock on the server at the replay time,
1649 * skip lock cancelling to make replay tests to pass. */
1650 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1653 LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, "
1654 "starting at %d", count, first);
1656 for (i = first; i < count; i++) {
1657 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
1659 LDLM_DEBUG_NOLOCK("server-side cancel handler stale "
1660 "lock (cookie %llu)",
1661 dlm_req->lock_handle[i].cookie);
1665 res = lock->l_resource;
1668 /* This code is an optimization to only attempt lock
1669 * granting on the resource (that could be CPU-expensive)
1670 * after we are done cancelling lock in that resource. */
1673 ldlm_reprocess_all(pres);
1674 LDLM_RESOURCE_DELREF(pres);
1675 ldlm_resource_putref(pres);
1678 ldlm_resource_getref(res);
1679 LDLM_RESOURCE_ADDREF(res);
1680 ldlm_res_lvbo_update(res, NULL, 1);
1685 if ((flags & LATF_STATS) && ldlm_is_ast_sent(lock)) {
1686 long delay = cfs_time_sub(cfs_time_current_sec(),
1687 lock->l_last_activity);
1688 LDLM_DEBUG(lock, "server cancels blocked lock after "
1689 CFS_DURATION_T"s", delay);
1690 at_measured(&lock->l_export->exp_bl_lock_at, delay);
1692 ldlm_lock_cancel(lock);
1693 LDLM_LOCK_PUT(lock);
1696 ldlm_reprocess_all(pres);
1697 LDLM_RESOURCE_DELREF(pres);
1698 ldlm_resource_putref(pres);
1700 LDLM_DEBUG_NOLOCK("server-side cancel handler END");
1703 EXPORT_SYMBOL(ldlm_request_cancel);
1706 * Main LDLM entry point for server code to cancel locks.
1708 * Typically gets called from service handler on LDLM_CANCEL opc.
1710 int ldlm_handle_cancel(struct ptlrpc_request *req)
1712 struct ldlm_request *dlm_req;
1716 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1717 if (dlm_req == NULL) {
1718 CDEBUG(D_INFO, "bad request buffer for cancel\n");
1722 if (req->rq_export && req->rq_export->exp_nid_stats &&
1723 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1724 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1725 LDLM_CANCEL - LDLM_FIRST_OPC);
1727 rc = req_capsule_server_pack(&req->rq_pill);
1731 if (!ldlm_request_cancel(req, dlm_req, 0, LATF_STATS))
1732 req->rq_status = LUSTRE_ESTALE;
1734 RETURN(ptlrpc_reply(req));
1736 #endif /* HAVE_SERVER_SUPPORT */
1739 * Callback handler for receiving incoming blocking ASTs.
1741 * This can only happen on client side.
1743 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
1744 struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1749 LDLM_DEBUG(lock, "client blocking AST callback handler");
1751 lock_res_and_lock(lock);
1752 ldlm_set_cbpending(lock);
1754 if (ldlm_is_cancel_on_block(lock))
1755 ldlm_set_cancel(lock);
1757 do_ast = (!lock->l_readers && !lock->l_writers);
1758 unlock_res_and_lock(lock);
1761 CDEBUG(D_DLMTRACE, "Lock %p already unused, calling callback (%p)\n",
1762 lock, lock->l_blocking_ast);
1763 if (lock->l_blocking_ast != NULL)
1764 lock->l_blocking_ast(lock, ld, lock->l_ast_data,
1767 CDEBUG(D_DLMTRACE, "Lock %p is referenced, will be cancelled later\n",
1771 LDLM_DEBUG(lock, "client blocking callback handler END");
1772 LDLM_LOCK_RELEASE(lock);
1777 * Callback handler for receiving incoming completion ASTs.
1779 * This only can happen on client side.
1781 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
1782 struct ldlm_namespace *ns,
1783 struct ldlm_request *dlm_req,
1784 struct ldlm_lock *lock)
1786 struct list_head ast_list;
1791 LDLM_DEBUG(lock, "client completion callback handler START");
1793 INIT_LIST_HEAD(&ast_list);
1794 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) {
1795 int to = cfs_time_seconds(1);
1797 set_current_state(TASK_INTERRUPTIBLE);
1798 schedule_timeout(to);
1799 if (lock->l_granted_mode == lock->l_req_mode ||
1800 ldlm_is_destroyed(lock))
1805 lvb_len = req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT);
1807 LDLM_ERROR(lock, "Fail to get lvb_len, rc = %d", lvb_len);
1808 GOTO(out, rc = lvb_len);
1809 } else if (lvb_len > 0) {
1810 if (lock->l_lvb_len > 0) {
1811 /* for extent lock, lvb contains ost_lvb{}. */
1812 LASSERT(lock->l_lvb_data != NULL);
1814 if (unlikely(lock->l_lvb_len < lvb_len)) {
1815 LDLM_ERROR(lock, "Replied LVB is larger than "
1816 "expectation, expected = %d, "
1818 lock->l_lvb_len, lvb_len);
1819 GOTO(out, rc = -EINVAL);
1824 lock_res_and_lock(lock);
1825 if (ldlm_is_destroyed(lock) ||
1826 lock->l_granted_mode == lock->l_req_mode) {
1827 /* bug 11300: the lock has already been granted */
1828 unlock_res_and_lock(lock);
1829 LDLM_DEBUG(lock, "Double grant race happened");
1833 /* If we receive the completion AST before the actual enqueue returned,
1834 * then we might need to switch lock modes, resources, or extents. */
1835 if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
1836 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
1837 LDLM_DEBUG(lock, "completion AST, new lock mode");
1840 if (lock->l_resource->lr_type != LDLM_PLAIN) {
1841 ldlm_convert_policy_to_local(req->rq_export,
1842 dlm_req->lock_desc.l_resource.lr_type,
1843 &dlm_req->lock_desc.l_policy_data,
1844 &lock->l_policy_data);
1845 LDLM_DEBUG(lock, "completion AST, new policy data");
1848 ldlm_resource_unlink_lock(lock);
1849 if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
1850 &lock->l_resource->lr_name,
1851 sizeof(lock->l_resource->lr_name)) != 0) {
1852 unlock_res_and_lock(lock);
1853 rc = ldlm_lock_change_resource(ns, lock,
1854 &dlm_req->lock_desc.l_resource.lr_name);
1856 LDLM_ERROR(lock, "Failed to allocate resource");
1859 LDLM_DEBUG(lock, "completion AST, new resource");
1860 CERROR("change resource!\n");
1861 lock_res_and_lock(lock);
1864 if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
1865 /* BL_AST locks are not needed in LRU.
1866 * Let ldlm_cancel_lru() be fast. */
1867 ldlm_lock_remove_from_lru(lock);
1868 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
1869 LDLM_DEBUG(lock, "completion AST includes blocking AST");
1872 if (lock->l_lvb_len > 0) {
1873 rc = ldlm_fill_lvb(lock, &req->rq_pill, RCL_CLIENT,
1874 lock->l_lvb_data, lvb_len);
1876 unlock_res_and_lock(lock);
1881 ldlm_grant_lock(lock, &ast_list);
1882 unlock_res_and_lock(lock);
1884 LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
1886 /* Let Enqueue to call osc_lock_upcall() and initialize
1888 OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 2);
1890 ldlm_run_ast_work(ns, &ast_list, LDLM_WORK_CP_AST);
1892 LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
1898 lock_res_and_lock(lock);
1899 ldlm_set_failed(lock);
1900 unlock_res_and_lock(lock);
1901 wake_up(&lock->l_waitq);
1903 LDLM_LOCK_RELEASE(lock);
1907 * Callback handler for receiving incoming glimpse ASTs.
1909 * This only can happen on client side. After handling the glimpse AST
1910 * we also consider dropping the lock here if it is unused locally for a
1913 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
1914 struct ldlm_namespace *ns,
1915 struct ldlm_request *dlm_req,
1916 struct ldlm_lock *lock)
1921 LDLM_DEBUG(lock, "client glimpse AST callback handler");
1923 if (lock->l_glimpse_ast != NULL)
1924 rc = lock->l_glimpse_ast(lock, req);
1926 if (req->rq_repmsg != NULL) {
1929 req->rq_status = rc;
1933 lock_res_and_lock(lock);
1934 if (lock->l_granted_mode == LCK_PW &&
1935 !lock->l_readers && !lock->l_writers &&
1936 cfs_time_after(cfs_time_current(),
1937 cfs_time_add(lock->l_last_used,
1938 cfs_time_seconds(10)))) {
1939 unlock_res_and_lock(lock);
1940 if (ldlm_bl_to_thread_lock(ns, NULL, lock))
1941 ldlm_handle_bl_callback(ns, NULL, lock);
1946 unlock_res_and_lock(lock);
1947 LDLM_LOCK_RELEASE(lock);
1951 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1953 if (req->rq_no_reply)
1956 req->rq_status = rc;
1957 if (!req->rq_packed_final) {
1958 rc = lustre_pack_reply(req, 1, NULL, NULL);
1962 return ptlrpc_reply(req);
1965 static int __ldlm_bl_to_thread(struct ldlm_bl_work_item *blwi,
1966 enum ldlm_cancel_flags cancel_flags)
1968 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1971 spin_lock(&blp->blp_lock);
1972 if (blwi->blwi_lock &&
1973 ldlm_is_discard_data(blwi->blwi_lock)) {
1974 /* add LDLM_FL_DISCARD_DATA requests to the priority list */
1975 list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
1977 /* other blocking callbacks are added to the regular list */
1978 list_add_tail(&blwi->blwi_entry, &blp->blp_list);
1980 spin_unlock(&blp->blp_lock);
1982 wake_up(&blp->blp_waitq);
1984 /* can not check blwi->blwi_flags as blwi could be already freed in
1986 if (!(cancel_flags & LCF_ASYNC))
1987 wait_for_completion(&blwi->blwi_comp);
1992 static inline void init_blwi(struct ldlm_bl_work_item *blwi,
1993 struct ldlm_namespace *ns,
1994 struct ldlm_lock_desc *ld,
1995 struct list_head *cancels, int count,
1996 struct ldlm_lock *lock,
1997 enum ldlm_cancel_flags cancel_flags)
1999 init_completion(&blwi->blwi_comp);
2000 INIT_LIST_HEAD(&blwi->blwi_head);
2002 if (memory_pressure_get())
2003 blwi->blwi_mem_pressure = 1;
2006 blwi->blwi_flags = cancel_flags;
2008 blwi->blwi_ld = *ld;
2010 list_add(&blwi->blwi_head, cancels);
2011 list_del_init(cancels);
2012 blwi->blwi_count = count;
2014 blwi->blwi_lock = lock;
2019 * Queues a list of locks \a cancels containing \a count locks
2020 * for later processing by a blocking thread. If \a count is zero,
2021 * then the lock referenced as \a lock is queued instead.
2023 * The blocking thread would then call ->l_blocking_ast callback in the lock.
2024 * If list addition fails an error is returned and caller is supposed to
2025 * call ->l_blocking_ast itself.
2027 static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
2028 struct ldlm_lock_desc *ld,
2029 struct ldlm_lock *lock,
2030 struct list_head *cancels, int count,
2031 enum ldlm_cancel_flags cancel_flags)
2035 if (cancels && count == 0)
2038 if (cancel_flags & LCF_ASYNC) {
2039 struct ldlm_bl_work_item *blwi;
2041 OBD_ALLOC(blwi, sizeof(*blwi));
2044 init_blwi(blwi, ns, ld, cancels, count, lock, cancel_flags);
2046 RETURN(__ldlm_bl_to_thread(blwi, cancel_flags));
2048 /* if it is synchronous call do minimum mem alloc, as it could
2049 * be triggered from kernel shrinker
2051 struct ldlm_bl_work_item blwi;
2053 memset(&blwi, 0, sizeof(blwi));
2054 init_blwi(&blwi, ns, ld, cancels, count, lock, cancel_flags);
2055 RETURN(__ldlm_bl_to_thread(&blwi, cancel_flags));
2060 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
2061 struct ldlm_lock *lock)
2063 return ldlm_bl_to_thread(ns, ld, lock, NULL, 0, LCF_ASYNC);
2066 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
2067 struct list_head *cancels, int count,
2068 enum ldlm_cancel_flags cancel_flags)
2070 return ldlm_bl_to_thread(ns, ld, NULL, cancels, count, cancel_flags);
2073 int ldlm_bl_thread_wakeup(void)
2075 wake_up(&ldlm_state->ldlm_bl_pool->blp_waitq);
2079 /* Setinfo coming from Server (eg MDT) to Client (eg MDC)! */
2080 static int ldlm_handle_setinfo(struct ptlrpc_request *req)
2082 struct obd_device *obd = req->rq_export->exp_obd;
2089 DEBUG_REQ(D_HSM, req, "%s: handle setinfo\n", obd->obd_name);
2091 req_capsule_set(&req->rq_pill, &RQF_OBD_SET_INFO);
2093 key = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
2095 DEBUG_REQ(D_IOCTL, req, "no set_info key");
2098 keylen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_KEY,
2100 val = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
2102 DEBUG_REQ(D_IOCTL, req, "no set_info val");
2105 vallen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_VAL,
2108 /* We are responsible for swabbing contents of val */
2110 if (KEY_IS(KEY_HSM_COPYTOOL_SEND))
2111 /* Pass it on to mdc (the "export" in this case) */
2112 rc = obd_set_info_async(req->rq_svc_thread->t_env,
2114 sizeof(KEY_HSM_COPYTOOL_SEND),
2115 KEY_HSM_COPYTOOL_SEND,
2118 DEBUG_REQ(D_WARNING, req, "ignoring unknown key %s", key);
2123 static inline void ldlm_callback_errmsg(struct ptlrpc_request *req,
2124 const char *msg, int rc,
2125 const struct lustre_handle *handle)
2127 DEBUG_REQ((req->rq_no_reply || rc) ? D_WARNING : D_DLMTRACE, req,
2128 "%s: [nid %s] [rc %d] [lock %#llx]",
2129 msg, libcfs_id2str(req->rq_peer), rc,
2130 handle ? handle->cookie : 0);
2131 if (req->rq_no_reply)
2132 CWARN("No reply was sent, maybe cause bug 21636.\n");
2134 CWARN("Send reply failed, maybe cause bug 21636.\n");
2137 /* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */
2138 static int ldlm_callback_handler(struct ptlrpc_request *req)
2140 struct ldlm_namespace *ns;
2141 struct ldlm_request *dlm_req;
2142 struct ldlm_lock *lock;
2146 /* Requests arrive in sender's byte order. The ptlrpc service
2147 * handler has already checked and, if necessary, byte-swapped the
2148 * incoming request message body, but I am responsible for the
2149 * message buffers. */
2151 /* do nothing for sec context finalize */
2152 if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI)
2155 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2157 if (req->rq_export == NULL) {
2158 rc = ldlm_callback_reply(req, -ENOTCONN);
2159 ldlm_callback_errmsg(req, "Operate on unconnected server",
2164 LASSERT(req->rq_export != NULL);
2165 LASSERT(req->rq_export->exp_obd != NULL);
2167 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2168 case LDLM_BL_CALLBACK:
2169 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET)) {
2171 ldlm_callback_reply(req, -(int)cfs_fail_err);
2175 case LDLM_CP_CALLBACK:
2176 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK_NET))
2179 case LDLM_GL_CALLBACK:
2180 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK_NET))
2184 rc = ldlm_handle_setinfo(req);
2185 ldlm_callback_reply(req, rc);
2187 case LLOG_ORIGIN_HANDLE_CREATE:
2188 req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
2189 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
2191 rc = llog_origin_handle_open(req);
2192 ldlm_callback_reply(req, rc);
2194 case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
2195 req_capsule_set(&req->rq_pill,
2196 &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
2197 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
2199 rc = llog_origin_handle_next_block(req);
2200 ldlm_callback_reply(req, rc);
2202 case LLOG_ORIGIN_HANDLE_READ_HEADER:
2203 req_capsule_set(&req->rq_pill,
2204 &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER);
2205 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
2207 rc = llog_origin_handle_read_header(req);
2208 ldlm_callback_reply(req, rc);
2210 case LLOG_ORIGIN_HANDLE_CLOSE:
2211 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
2213 rc = llog_origin_handle_close(req);
2214 ldlm_callback_reply(req, rc);
2217 CERROR("unknown opcode %u\n",
2218 lustre_msg_get_opc(req->rq_reqmsg));
2219 ldlm_callback_reply(req, -EPROTO);
2223 ns = req->rq_export->exp_obd->obd_namespace;
2224 LASSERT(ns != NULL);
2226 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2228 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2229 if (dlm_req == NULL) {
2230 rc = ldlm_callback_reply(req, -EPROTO);
2231 ldlm_callback_errmsg(req, "Operate without parameter", rc,
2236 /* Force a known safe race, send a cancel to the server for a lock
2237 * which the server has already started a blocking callback on. */
2238 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE) &&
2239 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
2240 rc = ldlm_cli_cancel(&dlm_req->lock_handle[0], 0);
2242 CERROR("ldlm_cli_cancel: %d\n", rc);
2245 lock = ldlm_handle2lock_long(&dlm_req->lock_handle[0], 0);
2247 CDEBUG(D_DLMTRACE, "callback on lock %#llx - lock "
2248 "disappeared\n", dlm_req->lock_handle[0].cookie);
2249 rc = ldlm_callback_reply(req, -EINVAL);
2250 ldlm_callback_errmsg(req, "Operate with invalid parameter", rc,
2251 &dlm_req->lock_handle[0]);
2255 if (ldlm_is_fail_loc(lock) &&
2256 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK)
2257 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
2259 /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
2260 lock_res_and_lock(lock);
2261 lock->l_flags |= ldlm_flags_from_wire(dlm_req->lock_flags &
2263 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
2264 /* If somebody cancels lock and cache is already dropped,
2265 * or lock is failed before cp_ast received on client,
2266 * we can tell the server we have no lock. Otherwise, we
2267 * should send cancel after dropping the cache. */
2268 if ((ldlm_is_canceling(lock) && ldlm_is_bl_done(lock)) ||
2269 ldlm_is_failed(lock)) {
2270 LDLM_DEBUG(lock, "callback on lock %llx - lock disappeared",
2271 dlm_req->lock_handle[0].cookie);
2272 unlock_res_and_lock(lock);
2273 LDLM_LOCK_RELEASE(lock);
2274 rc = ldlm_callback_reply(req, -EINVAL);
2275 ldlm_callback_errmsg(req, "Operate on stale lock", rc,
2276 &dlm_req->lock_handle[0]);
2279 /* BL_AST locks are not needed in LRU.
2280 * Let ldlm_cancel_lru() be fast. */
2281 ldlm_lock_remove_from_lru(lock);
2282 ldlm_set_bl_ast(lock);
2284 unlock_res_and_lock(lock);
2286 /* We want the ost thread to get this reply so that it can respond
2287 * to ost requests (write cache writeback) that might be triggered
2290 * But we'd also like to be able to indicate in the reply that we're
2291 * cancelling right now, because it's unused, or have an intent result
2292 * in the reply, so we might have to push the responsibility for sending
2293 * the reply down into the AST handlers, alas. */
2295 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2296 case LDLM_BL_CALLBACK:
2297 CDEBUG(D_INODE, "blocking ast\n");
2298 req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
2299 if (!ldlm_is_cancel_on_block(lock)) {
2300 rc = ldlm_callback_reply(req, 0);
2301 if (req->rq_no_reply || rc)
2302 ldlm_callback_errmsg(req, "Normal process", rc,
2303 &dlm_req->lock_handle[0]);
2305 if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
2306 ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
2308 case LDLM_CP_CALLBACK:
2309 CDEBUG(D_INODE, "completion ast\n");
2310 req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
2311 ldlm_callback_reply(req, 0);
2312 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
2314 case LDLM_GL_CALLBACK:
2315 CDEBUG(D_INODE, "glimpse ast\n");
2316 req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
2317 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
2320 LBUG(); /* checked above */
2326 #ifdef HAVE_SERVER_SUPPORT
2328 * Main handler for canceld thread.
2330 * Separated into its own thread to avoid deadlocks.
2332 static int ldlm_cancel_handler(struct ptlrpc_request *req)
2337 /* Requests arrive in sender's byte order. The ptlrpc service
2338 * handler has already checked and, if necessary, byte-swapped the
2339 * incoming request message body, but I am responsible for the
2340 * message buffers. */
2342 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2344 if (req->rq_export == NULL) {
2345 struct ldlm_request *dlm_req;
2347 CERROR("%s from %s arrived at %lu with bad export cookie "
2349 ll_opcode2str(lustre_msg_get_opc(req->rq_reqmsg)),
2350 libcfs_nid2str(req->rq_peer.nid),
2351 req->rq_arrival_time.tv_sec,
2352 lustre_msg_get_handle(req->rq_reqmsg)->cookie);
2354 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_CANCEL) {
2355 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2356 dlm_req = req_capsule_client_get(&req->rq_pill,
2358 if (dlm_req != NULL)
2359 ldlm_lock_dump_handle(D_ERROR,
2360 &dlm_req->lock_handle[0]);
2362 ldlm_callback_reply(req, -ENOTCONN);
2366 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2368 /* XXX FIXME move this back to mds/handler.c, bug 249 */
2370 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
2371 CDEBUG(D_INODE, "cancel\n");
2372 if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_NET) ||
2373 CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND) ||
2374 CFS_FAIL_CHECK(OBD_FAIL_LDLM_BL_EVICT))
2376 rc = ldlm_handle_cancel(req);
2381 CERROR("invalid opcode %d\n",
2382 lustre_msg_get_opc(req->rq_reqmsg));
2383 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2384 ldlm_callback_reply(req, -EINVAL);
2390 static int ldlm_cancel_hpreq_lock_match(struct ptlrpc_request *req,
2391 struct ldlm_lock *lock)
2393 struct ldlm_request *dlm_req;
2394 struct lustre_handle lockh;
2399 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2400 if (dlm_req == NULL)
2403 ldlm_lock2handle(lock, &lockh);
2404 for (i = 0; i < dlm_req->lock_count; i++) {
2405 if (lustre_handle_equal(&dlm_req->lock_handle[i],
2407 DEBUG_REQ(D_RPCTRACE, req,
2408 "Prio raised by lock %#llx.", lockh.cookie);
2419 static int ldlm_cancel_hpreq_check(struct ptlrpc_request *req)
2421 struct ldlm_request *dlm_req;
2426 /* no prolong in recovery */
2427 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
2430 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
2431 if (dlm_req == NULL)
2434 for (i = 0; i < dlm_req->lock_count; i++) {
2435 struct ldlm_lock *lock;
2437 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
2441 rc = ldlm_is_ast_sent(lock) ? 1 : 0;
2443 LDLM_DEBUG(lock, "hpreq cancel lock");
2444 LDLM_LOCK_PUT(lock);
2453 static struct ptlrpc_hpreq_ops ldlm_cancel_hpreq_ops = {
2454 .hpreq_lock_match = ldlm_cancel_hpreq_lock_match,
2455 .hpreq_check = ldlm_cancel_hpreq_check,
2459 static int ldlm_hpreq_handler(struct ptlrpc_request *req)
2463 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2465 if (req->rq_export == NULL)
2468 if (LDLM_CANCEL == lustre_msg_get_opc(req->rq_reqmsg)) {
2469 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
2470 req->rq_ops = &ldlm_cancel_hpreq_ops;
2475 static int ldlm_revoke_lock_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
2476 struct hlist_node *hnode, void *data)
2479 struct list_head *rpc_list = data;
2480 struct ldlm_lock *lock = cfs_hash_object(hs, hnode);
2482 lock_res_and_lock(lock);
2484 if (lock->l_req_mode != lock->l_granted_mode) {
2485 unlock_res_and_lock(lock);
2489 LASSERT(lock->l_resource);
2490 if (lock->l_resource->lr_type != LDLM_IBITS &&
2491 lock->l_resource->lr_type != LDLM_PLAIN) {
2492 unlock_res_and_lock(lock);
2496 if (ldlm_is_ast_sent(lock)) {
2497 unlock_res_and_lock(lock);
2501 LASSERT(lock->l_blocking_ast);
2502 LASSERT(!lock->l_blocking_lock);
2504 ldlm_set_ast_sent(lock);
2505 if (lock->l_export && lock->l_export->exp_lock_hash) {
2506 /* NB: it's safe to call cfs_hash_del() even lock isn't
2507 * in exp_lock_hash. */
2508 /* In the function below, .hs_keycmp resolves to
2509 * ldlm_export_lock_keycmp() */
2510 /* coverity[overrun-buffer-val] */
2511 cfs_hash_del(lock->l_export->exp_lock_hash,
2512 &lock->l_remote_handle, &lock->l_exp_hash);
2515 list_add_tail(&lock->l_rk_ast, rpc_list);
2516 LDLM_LOCK_GET(lock);
2518 unlock_res_and_lock(lock);
2522 void ldlm_revoke_export_locks(struct obd_export *exp)
2524 struct list_head rpc_list;
2527 INIT_LIST_HEAD(&rpc_list);
2528 cfs_hash_for_each_empty(exp->exp_lock_hash,
2529 ldlm_revoke_lock_cb, &rpc_list);
2530 ldlm_run_ast_work(exp->exp_obd->obd_namespace, &rpc_list,
2531 LDLM_WORK_REVOKE_AST);
2535 EXPORT_SYMBOL(ldlm_revoke_export_locks);
2536 #endif /* HAVE_SERVER_SUPPORT */
2538 static int ldlm_bl_get_work(struct ldlm_bl_pool *blp,
2539 struct ldlm_bl_work_item **p_blwi,
2540 struct obd_export **p_exp)
2542 struct ldlm_bl_work_item *blwi = NULL;
2543 static unsigned int num_bl = 0;
2544 static unsigned int num_stale;
2545 int num_th = atomic_read(&blp->blp_num_threads);
2547 *p_exp = obd_stale_export_get();
2549 spin_lock(&blp->blp_lock);
2550 if (*p_exp != NULL) {
2551 if (num_th == 1 || ++num_stale < num_th) {
2552 spin_unlock(&blp->blp_lock);
2559 /* process a request from the blp_list at least every blp_num_threads */
2560 if (!list_empty(&blp->blp_list) &&
2561 (list_empty(&blp->blp_prio_list) || num_bl == 0))
2562 blwi = list_entry(blp->blp_list.next,
2563 struct ldlm_bl_work_item, blwi_entry);
2565 if (!list_empty(&blp->blp_prio_list))
2566 blwi = list_entry(blp->blp_prio_list.next,
2567 struct ldlm_bl_work_item,
2571 if (++num_bl >= num_th)
2573 list_del(&blwi->blwi_entry);
2575 spin_unlock(&blp->blp_lock);
2578 if (*p_exp != NULL && *p_blwi != NULL) {
2579 obd_stale_export_put(*p_exp);
2583 return (*p_blwi != NULL || *p_exp != NULL) ? 1 : 0;
2586 /* This only contains temporary data until the thread starts */
2587 struct ldlm_bl_thread_data {
2588 struct ldlm_bl_pool *bltd_blp;
2589 struct completion bltd_comp;
2593 static int ldlm_bl_thread_main(void *arg);
2595 static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp, bool check_busy)
2597 struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
2598 struct task_struct *task;
2600 init_completion(&bltd.bltd_comp);
2602 bltd.bltd_num = atomic_inc_return(&blp->blp_num_threads);
2603 if (bltd.bltd_num >= blp->blp_max_threads) {
2604 atomic_dec(&blp->blp_num_threads);
2608 LASSERTF(bltd.bltd_num > 0, "thread num:%d\n", bltd.bltd_num);
2610 atomic_read(&blp->blp_busy_threads) < (bltd.bltd_num - 1)) {
2611 atomic_dec(&blp->blp_num_threads);
2615 task = kthread_run(ldlm_bl_thread_main, &bltd, "ldlm_bl_%02d",
2618 CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %ld\n",
2619 bltd.bltd_num, PTR_ERR(task));
2620 atomic_dec(&blp->blp_num_threads);
2621 return PTR_ERR(task);
2623 wait_for_completion(&bltd.bltd_comp);
2628 /* Not fatal if racy and have a few too many threads */
2629 static int ldlm_bl_thread_need_create(struct ldlm_bl_pool *blp,
2630 struct ldlm_bl_work_item *blwi)
2632 if (atomic_read(&blp->blp_num_threads) >= blp->blp_max_threads)
2635 if (atomic_read(&blp->blp_busy_threads) <
2636 atomic_read(&blp->blp_num_threads))
2639 if (blwi != NULL && (blwi->blwi_ns == NULL ||
2640 blwi->blwi_mem_pressure))
2646 static int ldlm_bl_thread_blwi(struct ldlm_bl_pool *blp,
2647 struct ldlm_bl_work_item *blwi)
2651 if (blwi->blwi_ns == NULL)
2652 /* added by ldlm_cleanup() */
2653 RETURN(LDLM_ITER_STOP);
2655 if (blwi->blwi_mem_pressure)
2656 memory_pressure_set();
2658 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_PAUSE_CANCEL2, 4);
2660 if (blwi->blwi_count) {
2662 /* The special case when we cancel locks in lru
2663 * asynchronously, we pass the list of locks here.
2664 * Thus locks are marked LDLM_FL_CANCELING, but NOT
2665 * canceled locally yet. */
2666 count = ldlm_cli_cancel_list_local(&blwi->blwi_head,
2669 ldlm_cli_cancel_list(&blwi->blwi_head, count, NULL,
2672 ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
2675 if (blwi->blwi_mem_pressure)
2676 memory_pressure_clr();
2678 if (blwi->blwi_flags & LCF_ASYNC)
2679 OBD_FREE(blwi, sizeof(*blwi));
2681 complete(&blwi->blwi_comp);
2687 * Cancel stale locks on export. Cancel blocked locks first.
2688 * If the given export has blocked locks, the next in the list may have
2689 * them too, thus cancel not blocked locks only if the current export has
2692 static int ldlm_bl_thread_exports(struct ldlm_bl_pool *blp,
2693 struct obd_export *exp)
2698 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_BL_EVICT, 4);
2700 num = ldlm_export_cancel_blocked_locks(exp);
2702 ldlm_export_cancel_locks(exp);
2704 obd_stale_export_put(exp);
2711 * Main blocking requests processing thread.
2713 * Callers put locks into its queue by calling ldlm_bl_to_thread.
2714 * This thread in the end ends up doing actual call to ->l_blocking_ast
2717 static int ldlm_bl_thread_main(void *arg)
2719 struct ldlm_bl_pool *blp;
2720 struct ldlm_bl_thread_data *bltd = arg;
2723 blp = bltd->bltd_blp;
2725 complete(&bltd->bltd_comp);
2726 /* cannot use bltd after this, it is only on caller's stack */
2729 struct l_wait_info lwi = { 0 };
2730 struct ldlm_bl_work_item *blwi = NULL;
2731 struct obd_export *exp = NULL;
2734 rc = ldlm_bl_get_work(blp, &blwi, &exp);
2737 l_wait_event_exclusive(blp->blp_waitq,
2738 ldlm_bl_get_work(blp, &blwi,
2741 atomic_inc(&blp->blp_busy_threads);
2743 if (ldlm_bl_thread_need_create(blp, blwi))
2744 /* discard the return value, we tried */
2745 ldlm_bl_thread_start(blp, true);
2748 rc = ldlm_bl_thread_exports(blp, exp);
2750 rc = ldlm_bl_thread_blwi(blp, blwi);
2752 atomic_dec(&blp->blp_busy_threads);
2754 if (rc == LDLM_ITER_STOP)
2758 atomic_dec(&blp->blp_num_threads);
2759 complete(&blp->blp_comp);
2764 static int ldlm_setup(void);
2765 static int ldlm_cleanup(void);
2767 int ldlm_get_ref(void)
2771 mutex_lock(&ldlm_ref_mutex);
2772 if (++ldlm_refcount == 1) {
2777 mutex_unlock(&ldlm_ref_mutex);
2782 void ldlm_put_ref(void)
2785 mutex_lock(&ldlm_ref_mutex);
2786 if (ldlm_refcount == 1) {
2787 int rc = ldlm_cleanup();
2789 CERROR("ldlm_cleanup failed: %d\n", rc);
2795 mutex_unlock(&ldlm_ref_mutex);
2801 * Export handle<->lock hash operations.
2804 ldlm_export_lock_hash(struct cfs_hash *hs, const void *key, unsigned mask)
2806 return cfs_hash_u64_hash(((struct lustre_handle *)key)->cookie, mask);
2810 ldlm_export_lock_key(struct hlist_node *hnode)
2812 struct ldlm_lock *lock;
2814 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2815 return &lock->l_remote_handle;
2819 ldlm_export_lock_keycpy(struct hlist_node *hnode, void *key)
2821 struct ldlm_lock *lock;
2823 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2824 lock->l_remote_handle = *(struct lustre_handle *)key;
2828 ldlm_export_lock_keycmp(const void *key, struct hlist_node *hnode)
2830 return lustre_handle_equal(ldlm_export_lock_key(hnode), key);
2834 ldlm_export_lock_object(struct hlist_node *hnode)
2836 return hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2840 ldlm_export_lock_get(struct cfs_hash *hs, struct hlist_node *hnode)
2842 struct ldlm_lock *lock;
2844 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2845 LDLM_LOCK_GET(lock);
2849 ldlm_export_lock_put(struct cfs_hash *hs, struct hlist_node *hnode)
2851 struct ldlm_lock *lock;
2853 lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2854 LDLM_LOCK_RELEASE(lock);
2857 static struct cfs_hash_ops ldlm_export_lock_ops = {
2858 .hs_hash = ldlm_export_lock_hash,
2859 .hs_key = ldlm_export_lock_key,
2860 .hs_keycmp = ldlm_export_lock_keycmp,
2861 .hs_keycpy = ldlm_export_lock_keycpy,
2862 .hs_object = ldlm_export_lock_object,
2863 .hs_get = ldlm_export_lock_get,
2864 .hs_put = ldlm_export_lock_put,
2865 .hs_put_locked = ldlm_export_lock_put,
2868 int ldlm_init_export(struct obd_export *exp)
2873 exp->exp_lock_hash =
2874 cfs_hash_create(obd_uuid2str(&exp->exp_client_uuid),
2875 HASH_EXP_LOCK_CUR_BITS,
2876 HASH_EXP_LOCK_MAX_BITS,
2877 HASH_EXP_LOCK_BKT_BITS, 0,
2878 CFS_HASH_MIN_THETA, CFS_HASH_MAX_THETA,
2879 &ldlm_export_lock_ops,
2880 CFS_HASH_DEFAULT | CFS_HASH_REHASH_KEY |
2881 CFS_HASH_NBLK_CHANGE);
2883 if (!exp->exp_lock_hash)
2886 rc = ldlm_init_flock_export(exp);
2892 ldlm_destroy_export(exp);
2895 EXPORT_SYMBOL(ldlm_init_export);
2897 void ldlm_destroy_export(struct obd_export *exp)
2900 cfs_hash_putref(exp->exp_lock_hash);
2901 exp->exp_lock_hash = NULL;
2903 ldlm_destroy_flock_export(exp);
2906 EXPORT_SYMBOL(ldlm_destroy_export);
2908 static int ldlm_setup(void)
2910 static struct ptlrpc_service_conf conf;
2911 struct ldlm_bl_pool *blp = NULL;
2912 #ifdef HAVE_SERVER_SUPPORT
2913 struct task_struct *task;
2914 #endif /* HAVE_SERVER_SUPPORT */
2920 if (ldlm_state != NULL)
2923 OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
2924 if (ldlm_state == NULL)
2927 #ifdef CONFIG_PROC_FS
2928 rc = ldlm_proc_setup();
2931 #endif /* CONFIG_PROC_FS */
2933 memset(&conf, 0, sizeof(conf));
2934 conf = (typeof(conf)) {
2935 .psc_name = "ldlm_cbd",
2936 .psc_watchdog_factor = 2,
2938 .bc_nbufs = LDLM_CLIENT_NBUFS,
2939 .bc_buf_size = LDLM_BUFSIZE,
2940 .bc_req_max_size = LDLM_MAXREQSIZE,
2941 .bc_rep_max_size = LDLM_MAXREPSIZE,
2942 .bc_req_portal = LDLM_CB_REQUEST_PORTAL,
2943 .bc_rep_portal = LDLM_CB_REPLY_PORTAL,
2946 .tc_thr_name = "ldlm_cb",
2947 .tc_thr_factor = LDLM_THR_FACTOR,
2948 .tc_nthrs_init = LDLM_NTHRS_INIT,
2949 .tc_nthrs_base = LDLM_NTHRS_BASE,
2950 .tc_nthrs_max = LDLM_NTHRS_MAX,
2951 .tc_nthrs_user = ldlm_num_threads,
2952 .tc_cpu_affinity = 1,
2953 .tc_ctx_tags = LCT_MD_THREAD | LCT_DT_THREAD,
2956 .cc_pattern = ldlm_cpts,
2959 .so_req_handler = ldlm_callback_handler,
2962 ldlm_state->ldlm_cb_service = \
2963 ptlrpc_register_service(&conf, ldlm_svc_proc_dir);
2964 if (IS_ERR(ldlm_state->ldlm_cb_service)) {
2965 CERROR("failed to start service\n");
2966 rc = PTR_ERR(ldlm_state->ldlm_cb_service);
2967 ldlm_state->ldlm_cb_service = NULL;
2971 #ifdef HAVE_SERVER_SUPPORT
2972 memset(&conf, 0, sizeof(conf));
2973 conf = (typeof(conf)) {
2974 .psc_name = "ldlm_canceld",
2975 .psc_watchdog_factor = 6,
2977 .bc_nbufs = LDLM_SERVER_NBUFS,
2978 .bc_buf_size = LDLM_BUFSIZE,
2979 .bc_req_max_size = LDLM_MAXREQSIZE,
2980 .bc_rep_max_size = LDLM_MAXREPSIZE,
2981 .bc_req_portal = LDLM_CANCEL_REQUEST_PORTAL,
2982 .bc_rep_portal = LDLM_CANCEL_REPLY_PORTAL,
2986 .tc_thr_name = "ldlm_cn",
2987 .tc_thr_factor = LDLM_THR_FACTOR,
2988 .tc_nthrs_init = LDLM_NTHRS_INIT,
2989 .tc_nthrs_base = LDLM_NTHRS_BASE,
2990 .tc_nthrs_max = LDLM_NTHRS_MAX,
2991 .tc_nthrs_user = ldlm_num_threads,
2992 .tc_cpu_affinity = 1,
2993 .tc_ctx_tags = LCT_MD_THREAD | \
2998 .cc_pattern = ldlm_cpts,
3001 .so_req_handler = ldlm_cancel_handler,
3002 .so_hpreq_handler = ldlm_hpreq_handler,
3005 ldlm_state->ldlm_cancel_service = \
3006 ptlrpc_register_service(&conf, ldlm_svc_proc_dir);
3007 if (IS_ERR(ldlm_state->ldlm_cancel_service)) {
3008 CERROR("failed to start service\n");
3009 rc = PTR_ERR(ldlm_state->ldlm_cancel_service);
3010 ldlm_state->ldlm_cancel_service = NULL;
3013 #endif /* HAVE_SERVER_SUPPORT */
3015 OBD_ALLOC(blp, sizeof(*blp));
3017 GOTO(out, rc = -ENOMEM);
3018 ldlm_state->ldlm_bl_pool = blp;
3020 spin_lock_init(&blp->blp_lock);
3021 INIT_LIST_HEAD(&blp->blp_list);
3022 INIT_LIST_HEAD(&blp->blp_prio_list);
3023 init_waitqueue_head(&blp->blp_waitq);
3024 atomic_set(&blp->blp_num_threads, 0);
3025 atomic_set(&blp->blp_busy_threads, 0);
3027 if (ldlm_num_threads == 0) {
3028 blp->blp_min_threads = LDLM_NTHRS_INIT;
3029 blp->blp_max_threads = LDLM_NTHRS_MAX;
3031 blp->blp_min_threads = blp->blp_max_threads = \
3032 min_t(int, LDLM_NTHRS_MAX, max_t(int, LDLM_NTHRS_INIT,
3036 for (i = 0; i < blp->blp_min_threads; i++) {
3037 rc = ldlm_bl_thread_start(blp, false);
3042 #ifdef HAVE_SERVER_SUPPORT
3043 INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
3044 expired_lock_thread.elt_state = ELT_STOPPED;
3045 init_waitqueue_head(&expired_lock_thread.elt_waitq);
3047 INIT_LIST_HEAD(&waiting_locks_list);
3048 spin_lock_init(&waiting_locks_spinlock);
3049 cfs_timer_init(&waiting_locks_timer, waiting_locks_callback, NULL);
3051 task = kthread_run(expired_lock_main, NULL, "ldlm_elt");
3054 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
3058 wait_event(expired_lock_thread.elt_waitq,
3059 expired_lock_thread.elt_state == ELT_READY);
3060 #endif /* HAVE_SERVER_SUPPORT */
3062 rc = ldlm_pools_init();
3064 CERROR("Failed to initialize LDLM pools: %d\n", rc);
3068 rc = ldlm_reclaim_setup();
3070 CERROR("Failed to setup reclaim thread: rc = %d\n", rc);
3080 static int ldlm_cleanup(void)
3084 if (!list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) ||
3085 !list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) {
3086 CERROR("ldlm still has namespaces; clean these up first.\n");
3087 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
3088 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
3092 ldlm_reclaim_cleanup();
3095 if (ldlm_state->ldlm_bl_pool != NULL) {
3096 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
3098 while (atomic_read(&blp->blp_num_threads) > 0) {
3099 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
3101 init_completion(&blp->blp_comp);
3103 spin_lock(&blp->blp_lock);
3104 list_add_tail(&blwi.blwi_entry, &blp->blp_list);
3105 wake_up(&blp->blp_waitq);
3106 spin_unlock(&blp->blp_lock);
3108 wait_for_completion(&blp->blp_comp);
3111 OBD_FREE(blp, sizeof(*blp));
3114 if (ldlm_state->ldlm_cb_service != NULL)
3115 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
3116 #ifdef HAVE_SERVER_SUPPORT
3117 if (ldlm_state->ldlm_cancel_service != NULL)
3118 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
3121 ldlm_proc_cleanup();
3123 #ifdef HAVE_SERVER_SUPPORT
3124 if (expired_lock_thread.elt_state != ELT_STOPPED) {
3125 expired_lock_thread.elt_state = ELT_TERMINATE;
3126 wake_up(&expired_lock_thread.elt_waitq);
3127 wait_event(expired_lock_thread.elt_waitq,
3128 expired_lock_thread.elt_state == ELT_STOPPED);
3132 OBD_FREE(ldlm_state, sizeof(*ldlm_state));
3140 mutex_init(&ldlm_ref_mutex);
3141 mutex_init(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER));
3142 mutex_init(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
3144 INIT_LIST_HEAD(&ldlm_srv_namespace_list);
3145 INIT_LIST_HEAD(&ldlm_cli_active_namespace_list);
3146 INIT_LIST_HEAD(&ldlm_cli_inactive_namespace_list);
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 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3173 class_export_dump_hook = ldlm_dump_export_locks;
3178 kmem_cache_destroy(ldlm_interval_slab);
3180 kmem_cache_destroy(ldlm_lock_slab);
3182 kmem_cache_destroy(ldlm_resource_slab);
3187 void ldlm_exit(void)
3190 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
3191 kmem_cache_destroy(ldlm_resource_slab);
3192 /* ldlm_lock_put() use RCU to call ldlm_lock_free, so need call
3193 * synchronize_rcu() to wait a grace period elapsed, so that
3194 * ldlm_lock_free() get a chance to be called. */
3196 kmem_cache_destroy(ldlm_lock_slab);
3197 kmem_cache_destroy(ldlm_interval_slab);
3198 kmem_cache_destroy(ldlm_interval_tree_slab);