1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/ldlm/ldlm_lockd.c
38 * Author: Peter Braam <braam@clusterfs.com>
39 * Author: Phil Schwan <phil@clusterfs.com>
43 # define EXPORT_SYMTAB
45 #define DEBUG_SUBSYSTEM S_LDLM
48 # include <libcfs/libcfs.h>
50 # include <liblustre.h>
53 #include <lustre_dlm.h>
54 #include <obd_class.h>
55 #include <libcfs/list.h>
56 #include "ldlm_internal.h"
59 static int ldlm_num_threads;
60 CFS_MODULE_PARM(ldlm_num_threads, "i", int, 0444,
61 "number of DLM service threads to start");
64 extern cfs_mem_cache_t *ldlm_resource_slab;
65 extern cfs_mem_cache_t *ldlm_lock_slab;
66 static cfs_semaphore_t ldlm_ref_sem;
67 static int ldlm_refcount;
69 struct ldlm_cb_async_args {
70 struct ldlm_cb_set_arg *ca_set_arg;
71 struct ldlm_lock *ca_lock;
76 static struct ldlm_state *ldlm_state;
78 inline cfs_time_t round_timeout(cfs_time_t timeout)
80 return cfs_time_seconds((int)cfs_duration_sec(cfs_time_sub(timeout, 0)) + 1);
83 /* timeout for initial callback (AST) reply (bz10399) */
84 static inline unsigned int ldlm_get_rq_timeout(void)
87 unsigned int timeout = min(ldlm_timeout, obd_timeout / 3);
89 return timeout < 1 ? 1 : timeout;
93 /* w_l_spinlock protects both waiting_locks_list and expired_lock_thread */
94 static cfs_spinlock_t waiting_locks_spinlock; /* BH lock (timer) */
95 static cfs_list_t waiting_locks_list;
96 static cfs_timer_t waiting_locks_timer;
98 static struct expired_lock_thread {
99 cfs_waitq_t elt_waitq;
102 cfs_list_t elt_expired_locks;
103 } expired_lock_thread;
106 #define ELT_STOPPED 0
108 #define ELT_TERMINATE 2
110 struct ldlm_bl_pool {
111 cfs_spinlock_t blp_lock;
114 * blp_prio_list is used for callbacks that should be handled
115 * as a priority. It is used for LDLM_FL_DISCARD_DATA requests.
118 cfs_list_t blp_prio_list;
121 * blp_list is used for all other callbacks which are likely
122 * to take longer to process.
126 cfs_waitq_t blp_waitq;
127 cfs_completion_t blp_comp;
128 cfs_atomic_t blp_num_threads;
129 cfs_atomic_t blp_busy_threads;
134 struct ldlm_bl_work_item {
135 cfs_list_t blwi_entry;
136 struct ldlm_namespace *blwi_ns;
137 struct ldlm_lock_desc blwi_ld;
138 struct ldlm_lock *blwi_lock;
139 cfs_list_t blwi_head;
141 cfs_completion_t blwi_comp;
143 int blwi_mem_pressure;
148 static inline int have_expired_locks(void)
153 cfs_spin_lock_bh(&waiting_locks_spinlock);
154 need_to_run = !cfs_list_empty(&expired_lock_thread.elt_expired_locks);
155 cfs_spin_unlock_bh(&waiting_locks_spinlock);
160 static int expired_lock_main(void *arg)
162 cfs_list_t *expired = &expired_lock_thread.elt_expired_locks;
163 struct l_wait_info lwi = { 0 };
167 cfs_daemonize("ldlm_elt");
169 expired_lock_thread.elt_state = ELT_READY;
170 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
173 l_wait_event(expired_lock_thread.elt_waitq,
174 have_expired_locks() ||
175 expired_lock_thread.elt_state == ELT_TERMINATE,
178 cfs_spin_lock_bh(&waiting_locks_spinlock);
179 if (expired_lock_thread.elt_dump) {
180 cfs_spin_unlock_bh(&waiting_locks_spinlock);
182 /* from waiting_locks_callback, but not in timer */
183 libcfs_debug_dumplog();
184 libcfs_run_lbug_upcall(__FILE__,
185 "waiting_locks_callback",
186 expired_lock_thread.elt_dump);
188 cfs_spin_lock_bh(&waiting_locks_spinlock);
189 expired_lock_thread.elt_dump = 0;
194 while (!cfs_list_empty(expired)) {
195 struct obd_export *export;
196 struct ldlm_lock *lock;
198 lock = cfs_list_entry(expired->next, struct ldlm_lock,
200 if ((void *)lock < LP_POISON + CFS_PAGE_SIZE &&
201 (void *)lock >= LP_POISON) {
202 cfs_spin_unlock_bh(&waiting_locks_spinlock);
203 CERROR("free lock on elt list %p\n", lock);
206 cfs_list_del_init(&lock->l_pending_chain);
207 if ((void *)lock->l_export < LP_POISON + CFS_PAGE_SIZE &&
208 (void *)lock->l_export >= LP_POISON) {
209 CERROR("lock with free export on elt list %p\n",
211 lock->l_export = NULL;
212 LDLM_ERROR(lock, "free export");
213 /* release extra ref grabbed by
214 * ldlm_add_waiting_lock() or
215 * ldlm_failed_ast() */
216 LDLM_LOCK_RELEASE(lock);
219 export = class_export_lock_get(lock->l_export, lock);
220 cfs_spin_unlock_bh(&waiting_locks_spinlock);
223 class_fail_export(export);
224 class_export_lock_put(export, lock);
226 /* release extra ref grabbed by ldlm_add_waiting_lock()
227 * or ldlm_failed_ast() */
228 LDLM_LOCK_RELEASE(lock);
230 cfs_spin_lock_bh(&waiting_locks_spinlock);
232 cfs_spin_unlock_bh(&waiting_locks_spinlock);
234 if (do_dump && obd_dump_on_eviction) {
235 CERROR("dump the log upon eviction\n");
236 libcfs_debug_dumplog();
239 if (expired_lock_thread.elt_state == ELT_TERMINATE)
243 expired_lock_thread.elt_state = ELT_STOPPED;
244 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
248 static int ldlm_add_waiting_lock(struct ldlm_lock *lock);
251 * Check if there is a request in the export request list
252 * which prevents the lock canceling.
254 static int ldlm_lock_busy(struct ldlm_lock *lock)
256 struct ptlrpc_request *req;
260 if (lock->l_export == NULL)
263 cfs_spin_lock_bh(&lock->l_export->exp_rpc_lock);
264 cfs_list_for_each_entry(req, &lock->l_export->exp_queued_rpc,
266 if (req->rq_ops->hpreq_lock_match) {
267 match = req->rq_ops->hpreq_lock_match(req, lock);
272 cfs_spin_unlock_bh(&lock->l_export->exp_rpc_lock);
276 /* This is called from within a timer interrupt and cannot schedule */
277 static void waiting_locks_callback(unsigned long unused)
279 struct ldlm_lock *lock, *last = NULL;
282 cfs_spin_lock_bh(&waiting_locks_spinlock);
283 while (!cfs_list_empty(&waiting_locks_list)) {
284 lock = cfs_list_entry(waiting_locks_list.next, struct ldlm_lock,
286 if (cfs_time_after(lock->l_callback_timeout,
287 cfs_time_current()) ||
288 (lock->l_req_mode == LCK_GROUP))
291 if (ptlrpc_check_suspend()) {
292 /* there is a case when we talk to one mds, holding
293 * lock from another mds. this way we easily can get
294 * here, if second mds is being recovered. so, we
295 * suspend timeouts. bug 6019 */
297 LDLM_ERROR(lock, "recharge timeout: %s@%s nid %s ",
298 lock->l_export->exp_client_uuid.uuid,
299 lock->l_export->exp_connection->c_remote_uuid.uuid,
300 libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
302 cfs_list_del_init(&lock->l_pending_chain);
303 cfs_spin_unlock_bh(&waiting_locks_spinlock);
304 ldlm_add_waiting_lock(lock);
308 /* if timeout overlaps the activation time of suspended timeouts
309 * then extend it to give a chance for client to reconnect */
310 if (cfs_time_before(cfs_time_sub(lock->l_callback_timeout,
311 cfs_time_seconds(obd_timeout)/2),
312 ptlrpc_suspend_wakeup_time())) {
313 LDLM_ERROR(lock, "extend timeout due to recovery: %s@%s nid %s ",
314 lock->l_export->exp_client_uuid.uuid,
315 lock->l_export->exp_connection->c_remote_uuid.uuid,
316 libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid));
318 cfs_list_del_init(&lock->l_pending_chain);
319 cfs_spin_unlock_bh(&waiting_locks_spinlock);
320 ldlm_add_waiting_lock(lock);
324 /* Check if we need to prolong timeout */
325 if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT) &&
326 ldlm_lock_busy(lock)) {
329 if (lock->l_pending_chain.next == &waiting_locks_list)
334 cfs_spin_unlock_bh(&waiting_locks_spinlock);
335 LDLM_DEBUG(lock, "prolong the busy lock");
336 ldlm_refresh_waiting_lock(lock,
337 ldlm_get_enq_timeout(lock));
338 cfs_spin_lock_bh(&waiting_locks_spinlock);
341 LDLM_LOCK_RELEASE(lock);
345 LDLM_LOCK_RELEASE(lock);
348 ldlm_lock_to_ns(lock)->ns_timeouts++;
349 LDLM_ERROR(lock, "lock callback timer expired after %lds: "
350 "evicting client at %s ",
351 cfs_time_current_sec()- lock->l_last_activity,
353 lock->l_export->exp_connection->c_peer.nid));
357 /* no needs to take an extra ref on the lock since it was in
358 * the waiting_locks_list and ldlm_add_waiting_lock()
359 * already grabbed a ref */
360 cfs_list_del(&lock->l_pending_chain);
361 cfs_list_add(&lock->l_pending_chain,
362 &expired_lock_thread.elt_expired_locks);
365 if (!cfs_list_empty(&expired_lock_thread.elt_expired_locks)) {
366 if (obd_dump_on_timeout)
367 expired_lock_thread.elt_dump = __LINE__;
369 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
373 * Make sure the timer will fire again if we have any locks
376 if (!cfs_list_empty(&waiting_locks_list)) {
377 cfs_time_t timeout_rounded;
378 lock = cfs_list_entry(waiting_locks_list.next, struct ldlm_lock,
380 timeout_rounded = (cfs_time_t)round_timeout(lock->l_callback_timeout);
381 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
383 cfs_spin_unlock_bh(&waiting_locks_spinlock);
387 * Indicate that we're waiting for a client to call us back cancelling a given
388 * lock. We add it to the pending-callback chain, and schedule the lock-timeout
389 * timer to fire appropriately. (We round up to the next second, to avoid
390 * floods of timer firings during periods of high lock contention and traffic).
391 * As done by ldlm_add_waiting_lock(), the caller must grab a lock reference
392 * if it has been added to the waiting list (1 is returned).
394 * Called with the namespace lock held.
396 static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, int seconds)
399 cfs_time_t timeout_rounded;
401 if (!cfs_list_empty(&lock->l_pending_chain))
404 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT) ||
405 OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
408 timeout = cfs_time_shift(seconds);
409 if (likely(cfs_time_after(timeout, lock->l_callback_timeout)))
410 lock->l_callback_timeout = timeout;
412 timeout_rounded = round_timeout(lock->l_callback_timeout);
414 if (cfs_time_before(timeout_rounded,
415 cfs_timer_deadline(&waiting_locks_timer)) ||
416 !cfs_timer_is_armed(&waiting_locks_timer)) {
417 cfs_timer_arm(&waiting_locks_timer, timeout_rounded);
419 /* if the new lock has a shorter timeout than something earlier on
420 the list, we'll wait the longer amount of time; no big deal. */
422 cfs_list_add_tail(&lock->l_pending_chain, &waiting_locks_list);
426 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
429 int timeout = ldlm_get_enq_timeout(lock);
431 LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK));
433 cfs_spin_lock_bh(&waiting_locks_spinlock);
434 if (lock->l_destroyed) {
435 static cfs_time_t next;
436 cfs_spin_unlock_bh(&waiting_locks_spinlock);
437 LDLM_ERROR(lock, "not waiting on destroyed lock (bug 5653)");
438 if (cfs_time_after(cfs_time_current(), next)) {
439 next = cfs_time_shift(14400);
440 libcfs_debug_dumpstack(NULL);
445 ret = __ldlm_add_waiting_lock(lock, timeout);
447 /* grab ref on the lock if it has been added to the
450 cfs_spin_unlock_bh(&waiting_locks_spinlock);
452 LDLM_DEBUG(lock, "%sadding to wait list(timeout: %d, AT: %s)",
453 ret == 0 ? "not re-" : "", timeout,
454 AT_OFF ? "off" : "on");
459 * Remove a lock from the pending list, likely because it had its cancellation
460 * callback arrive without incident. This adjusts the lock-timeout timer if
461 * needed. Returns 0 if the lock wasn't pending after all, 1 if it was.
462 * As done by ldlm_del_waiting_lock(), the caller must release the lock
463 * reference when the lock is removed from any list (1 is returned).
465 * Called with namespace lock held.
467 static int __ldlm_del_waiting_lock(struct ldlm_lock *lock)
469 cfs_list_t *list_next;
471 if (cfs_list_empty(&lock->l_pending_chain))
474 list_next = lock->l_pending_chain.next;
475 if (lock->l_pending_chain.prev == &waiting_locks_list) {
476 /* Removing the head of the list, adjust timer. */
477 if (list_next == &waiting_locks_list) {
478 /* No more, just cancel. */
479 cfs_timer_disarm(&waiting_locks_timer);
481 struct ldlm_lock *next;
482 next = cfs_list_entry(list_next, struct ldlm_lock,
484 cfs_timer_arm(&waiting_locks_timer,
485 round_timeout(next->l_callback_timeout));
488 cfs_list_del_init(&lock->l_pending_chain);
493 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
497 if (lock->l_export == NULL) {
498 /* We don't have a "waiting locks list" on clients. */
499 CDEBUG(D_DLMTRACE, "Client lock %p : no-op\n", lock);
503 cfs_spin_lock_bh(&waiting_locks_spinlock);
504 ret = __ldlm_del_waiting_lock(lock);
505 cfs_spin_unlock_bh(&waiting_locks_spinlock);
507 /* release lock ref if it has indeed been removed
509 LDLM_LOCK_RELEASE(lock);
511 LDLM_DEBUG(lock, "%s", ret == 0 ? "wasn't waiting" : "removed");
518 * Called with namespace lock held.
520 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout)
522 if (lock->l_export == NULL) {
523 /* We don't have a "waiting locks list" on clients. */
524 LDLM_DEBUG(lock, "client lock: no-op");
528 cfs_spin_lock_bh(&waiting_locks_spinlock);
530 if (cfs_list_empty(&lock->l_pending_chain)) {
531 cfs_spin_unlock_bh(&waiting_locks_spinlock);
532 LDLM_DEBUG(lock, "wasn't waiting");
536 /* we remove/add the lock to the waiting list, so no needs to
537 * release/take a lock reference */
538 __ldlm_del_waiting_lock(lock);
539 __ldlm_add_waiting_lock(lock, timeout);
540 cfs_spin_unlock_bh(&waiting_locks_spinlock);
542 LDLM_DEBUG(lock, "refreshed");
545 #else /* !__KERNEL__ */
547 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
549 LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK));
553 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
558 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout)
562 #endif /* __KERNEL__ */
564 static void ldlm_failed_ast(struct ldlm_lock *lock, int rc,
565 const char *ast_type)
567 LCONSOLE_ERROR_MSG(0x138, "%s: A client on nid %s was evicted due "
568 "to a lock %s callback time out: rc %d\n",
569 lock->l_export->exp_obd->obd_name,
570 obd_export_nid2str(lock->l_export), ast_type, rc);
572 if (obd_dump_on_timeout)
573 libcfs_debug_dumplog();
575 cfs_spin_lock_bh(&waiting_locks_spinlock);
576 if (__ldlm_del_waiting_lock(lock) == 0)
577 /* the lock was not in any list, grab an extra ref before adding
578 * the lock to the expired list */
580 cfs_list_add(&lock->l_pending_chain,
581 &expired_lock_thread.elt_expired_locks);
582 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
583 cfs_spin_unlock_bh(&waiting_locks_spinlock);
585 class_fail_export(lock->l_export);
589 static int ldlm_handle_ast_error(struct ldlm_lock *lock,
590 struct ptlrpc_request *req, int rc,
591 const char *ast_type)
593 lnet_process_id_t peer = req->rq_import->imp_connection->c_peer;
595 if (rc == -ETIMEDOUT || rc == -EINTR || rc == -ENOTCONN) {
596 LASSERT(lock->l_export);
597 if (lock->l_export->exp_libclient) {
598 LDLM_DEBUG(lock, "%s AST to liblustre client (nid %s)"
599 " timeout, just cancelling lock", ast_type,
600 libcfs_nid2str(peer.nid));
601 ldlm_lock_cancel(lock);
603 } else if (lock->l_flags & LDLM_FL_CANCEL) {
604 LDLM_DEBUG(lock, "%s AST timeout from nid %s, but "
605 "cancel was received (AST reply lost?)",
606 ast_type, libcfs_nid2str(peer.nid));
607 ldlm_lock_cancel(lock);
610 ldlm_del_waiting_lock(lock);
611 ldlm_failed_ast(lock, rc, ast_type);
615 struct ldlm_resource *res = lock->l_resource;
616 LDLM_DEBUG(lock, "client (nid %s) returned %d"
617 " from %s AST - normal race",
618 libcfs_nid2str(peer.nid),
620 lustre_msg_get_status(req->rq_repmsg) : -1,
623 /* update lvbo to return proper attributes.
625 ldlm_resource_getref(res);
626 ldlm_res_lvbo_update(res, NULL, 1);
627 ldlm_resource_putref(res);
631 LDLM_ERROR(lock, "client (nid %s) returned %d "
632 "from %s AST", libcfs_nid2str(peer.nid),
633 (req->rq_repmsg != NULL) ?
634 lustre_msg_get_status(req->rq_repmsg) : 0,
637 ldlm_lock_cancel(lock);
638 /* Server-side AST functions are called from ldlm_reprocess_all,
639 * which needs to be told to please restart its reprocessing. */
646 static int ldlm_cb_interpret(const struct lu_env *env,
647 struct ptlrpc_request *req, void *data, int rc)
649 struct ldlm_cb_async_args *ca = data;
650 struct ldlm_cb_set_arg *arg = ca->ca_set_arg;
651 struct ldlm_lock *lock = ca->ca_lock;
654 LASSERT(lock != NULL);
656 rc = ldlm_handle_ast_error(lock, req, rc,
657 arg->type == LDLM_BL_CALLBACK
658 ? "blocking" : "completion");
661 LDLM_LOCK_RELEASE(lock);
664 cfs_atomic_set(&arg->restart, 1);
669 static inline int ldlm_bl_and_cp_ast_fini(struct ptlrpc_request *req,
670 struct ldlm_cb_set_arg *arg,
671 struct ldlm_lock *lock,
677 if (unlikely(instant_cancel)) {
678 rc = ptl_send_rpc(req, 1);
679 ptlrpc_req_finished(req);
681 /* If we cancelled the lock, we need to restart
682 * ldlm_reprocess_queue */
683 cfs_atomic_set(&arg->restart, 1);
686 ptlrpc_set_add_req(arg->set, req);
693 * Check if there are requests in the export request list which prevent
694 * the lock canceling and make these requests high priority ones.
696 static void ldlm_lock_reorder_req(struct ldlm_lock *lock)
698 struct ptlrpc_request *req;
701 if (lock->l_export == NULL) {
702 LDLM_DEBUG(lock, "client lock: no-op");
706 cfs_spin_lock_bh(&lock->l_export->exp_rpc_lock);
707 cfs_list_for_each_entry(req, &lock->l_export->exp_queued_rpc,
709 if (!req->rq_hp && req->rq_ops->hpreq_lock_match &&
710 req->rq_ops->hpreq_lock_match(req, lock))
711 ptlrpc_hpreq_reorder(req);
713 cfs_spin_unlock_bh(&lock->l_export->exp_rpc_lock);
718 * ->l_blocking_ast() method for server-side locks. This is invoked when newly
719 * enqueued server lock conflicts with given one.
721 * Sends blocking ast rpc to the client owning that lock; arms timeout timer
722 * to wait for client response.
724 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
725 struct ldlm_lock_desc *desc,
726 void *data, int flag)
728 struct ldlm_cb_async_args *ca;
729 struct ldlm_cb_set_arg *arg = data;
730 struct ldlm_request *body;
731 struct ptlrpc_request *req;
732 int instant_cancel = 0;
736 if (flag == LDLM_CB_CANCELING)
737 /* Don't need to do anything here. */
741 LASSERT(data != NULL);
742 if (lock->l_export->exp_obd->obd_recovering != 0) {
743 LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
744 ldlm_lock_dump(D_ERROR, lock, 0);
747 ldlm_lock_reorder_req(lock);
749 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
750 &RQF_LDLM_BL_CALLBACK,
751 LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK);
755 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
756 ca = ptlrpc_req_async_args(req);
757 ca->ca_set_arg = arg;
760 req->rq_interpret_reply = ldlm_cb_interpret;
761 req->rq_no_resend = 1;
763 lock_res(lock->l_resource);
764 if (lock->l_granted_mode != lock->l_req_mode) {
765 /* this blocking AST will be communicated as part of the
766 * completion AST instead */
767 unlock_res(lock->l_resource);
768 ptlrpc_req_finished(req);
769 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
773 if (lock->l_destroyed) {
774 /* What's the point? */
775 unlock_res(lock->l_resource);
776 ptlrpc_req_finished(req);
780 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
783 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
784 body->lock_handle[0] = lock->l_remote_handle;
785 body->lock_desc = *desc;
786 body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
788 LDLM_DEBUG(lock, "server preparing blocking AST");
790 ptlrpc_request_set_replen(req);
791 if (instant_cancel) {
792 unlock_res(lock->l_resource);
793 ldlm_lock_cancel(lock);
795 LASSERT(lock->l_granted_mode == lock->l_req_mode);
796 ldlm_add_waiting_lock(lock);
797 unlock_res(lock->l_resource);
800 req->rq_send_state = LUSTRE_IMP_FULL;
801 /* ptlrpc_request_alloc_pack already set timeout */
803 req->rq_timeout = ldlm_get_rq_timeout();
805 if (lock->l_export && lock->l_export->exp_nid_stats &&
806 lock->l_export->exp_nid_stats->nid_ldlm_stats)
807 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
808 LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
810 rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
815 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data)
817 struct ldlm_cb_set_arg *arg = data;
818 struct ldlm_request *body;
819 struct ptlrpc_request *req;
820 struct ldlm_cb_async_args *ca;
821 long total_enqueue_wait;
822 int instant_cancel = 0;
826 LASSERT(lock != NULL);
827 LASSERT(data != NULL);
829 total_enqueue_wait = cfs_time_sub(cfs_time_current_sec(),
830 lock->l_last_activity);
832 req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse,
833 &RQF_LDLM_CP_CALLBACK);
837 /* server namespace, doesn't need lock */
838 if (lock->l_resource->lr_lvb_len) {
839 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT,
840 lock->l_resource->lr_lvb_len);
843 rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK);
845 ptlrpc_request_free(req);
849 CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args));
850 ca = ptlrpc_req_async_args(req);
851 ca->ca_set_arg = arg;
854 req->rq_interpret_reply = ldlm_cb_interpret;
855 req->rq_no_resend = 1;
856 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
858 body->lock_handle[0] = lock->l_remote_handle;
859 body->lock_flags = flags;
860 ldlm_lock2desc(lock, &body->lock_desc);
861 if (lock->l_resource->lr_lvb_len) {
862 void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB);
864 lock_res(lock->l_resource);
865 memcpy(lvb, lock->l_resource->lr_lvb_data,
866 lock->l_resource->lr_lvb_len);
867 unlock_res(lock->l_resource);
870 LDLM_DEBUG(lock, "server preparing completion AST (after %lds wait)",
873 /* Server-side enqueue wait time estimate, used in
874 __ldlm_add_waiting_lock to set future enqueue timers */
875 if (total_enqueue_wait < ldlm_get_enq_timeout(lock))
876 at_measured(ldlm_lock_to_ns_at(lock),
879 /* bz18618. Don't add lock enqueue time we spend waiting for a
880 previous callback to fail. Locks waiting legitimately will
881 get extended by ldlm_refresh_waiting_lock regardless of the
882 estimate, so it's okay to underestimate here. */
883 LDLM_DEBUG(lock, "lock completed after %lus; estimate was %ds. "
884 "It is likely that a previous callback timed out.",
886 at_get(ldlm_lock_to_ns_at(lock)));
888 ptlrpc_request_set_replen(req);
890 req->rq_send_state = LUSTRE_IMP_FULL;
891 /* ptlrpc_request_pack already set timeout */
893 req->rq_timeout = ldlm_get_rq_timeout();
895 /* We only send real blocking ASTs after the lock is granted */
896 lock_res_and_lock(lock);
897 if (lock->l_flags & LDLM_FL_AST_SENT) {
898 body->lock_flags |= LDLM_FL_AST_SENT;
899 /* copy ast flags like LDLM_FL_DISCARD_DATA */
900 body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
902 /* We might get here prior to ldlm_handle_enqueue setting
903 * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
904 * into waiting list, but this is safe and similar code in
905 * ldlm_handle_enqueue will call ldlm_lock_cancel() still,
906 * that would not only cancel the lock, but will also remove
907 * it from waiting list */
908 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
909 unlock_res_and_lock(lock);
910 ldlm_lock_cancel(lock);
912 lock_res_and_lock(lock);
914 /* start the lock-timeout clock */
915 ldlm_add_waiting_lock(lock);
918 unlock_res_and_lock(lock);
920 if (lock->l_export && lock->l_export->exp_nid_stats &&
921 lock->l_export->exp_nid_stats->nid_ldlm_stats)
922 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
923 LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
925 rc = ldlm_bl_and_cp_ast_fini(req, arg, lock, instant_cancel);
930 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
932 struct ldlm_resource *res = lock->l_resource;
933 struct ldlm_request *body;
934 struct ptlrpc_request *req;
938 LASSERT(lock != NULL);
940 req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
941 &RQF_LDLM_GL_CALLBACK,
942 LUSTRE_DLM_VERSION, LDLM_GL_CALLBACK);
947 body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
948 body->lock_handle[0] = lock->l_remote_handle;
949 ldlm_lock2desc(lock, &body->lock_desc);
951 /* server namespace, doesn't need lock */
952 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
953 lock->l_resource->lr_lvb_len);
954 res = lock->l_resource;
955 ptlrpc_request_set_replen(req);
958 req->rq_send_state = LUSTRE_IMP_FULL;
959 /* ptlrpc_request_alloc_pack already set timeout */
961 req->rq_timeout = ldlm_get_rq_timeout();
963 if (lock->l_export && lock->l_export->exp_nid_stats &&
964 lock->l_export->exp_nid_stats->nid_ldlm_stats)
965 lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
966 LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
968 rc = ptlrpc_queue_wait(req);
969 if (rc == -ELDLM_NO_LOCK_DATA)
970 LDLM_DEBUG(lock, "lost race - client has a lock but no inode");
972 rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
974 rc = ldlm_res_lvbo_update(res, req, 1);
976 ptlrpc_req_finished(req);
978 ldlm_reprocess_all(res);
984 extern unsigned long long lu_time_stamp_get(void);
986 #define lu_time_stamp_get() time(NULL)
989 static void ldlm_svc_get_eopc(const struct ldlm_request *dlm_req,
990 struct lprocfs_stats *srv_stats)
992 int lock_type = 0, op = 0;
994 lock_type = dlm_req->lock_desc.l_resource.lr_type;
998 op = PTLRPC_LAST_CNTR + LDLM_PLAIN_ENQUEUE;
1001 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT)
1002 op = PTLRPC_LAST_CNTR + LDLM_GLIMPSE_ENQUEUE;
1004 op = PTLRPC_LAST_CNTR + LDLM_EXTENT_ENQUEUE;
1007 op = PTLRPC_LAST_CNTR + LDLM_FLOCK_ENQUEUE;
1010 op = PTLRPC_LAST_CNTR + LDLM_IBITS_ENQUEUE;
1018 lprocfs_counter_incr(srv_stats, op);
1024 * Main server-side entry point into LDLM. This is called by ptlrpc service
1025 * threads to carry out client lock enqueueing requests.
1027 int ldlm_handle_enqueue0(struct ldlm_namespace *ns,
1028 struct ptlrpc_request *req,
1029 const struct ldlm_request *dlm_req,
1030 const struct ldlm_callback_suite *cbs)
1032 struct ldlm_reply *dlm_rep;
1034 ldlm_error_t err = ELDLM_OK;
1035 struct ldlm_lock *lock = NULL;
1036 void *cookie = NULL;
1040 LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
1042 ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF);
1043 flags = dlm_req->lock_flags;
1045 LASSERT(req->rq_export);
1047 if (req->rq_rqbd->rqbd_service->srv_stats)
1048 ldlm_svc_get_eopc(dlm_req,
1049 req->rq_rqbd->rqbd_service->srv_stats);
1051 if (req->rq_export && req->rq_export->exp_nid_stats &&
1052 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1053 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1054 LDLM_ENQUEUE - LDLM_FIRST_OPC);
1056 if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE ||
1057 dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) {
1058 DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
1059 dlm_req->lock_desc.l_resource.lr_type);
1060 GOTO(out, rc = -EFAULT);
1063 if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE ||
1064 dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE ||
1065 dlm_req->lock_desc.l_req_mode &
1066 (dlm_req->lock_desc.l_req_mode-1))) {
1067 DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
1068 dlm_req->lock_desc.l_req_mode);
1069 GOTO(out, rc = -EFAULT);
1072 if (req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) {
1073 if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1075 DEBUG_REQ(D_ERROR, req,
1076 "PLAIN lock request from IBITS client?");
1077 GOTO(out, rc = -EPROTO);
1079 } else if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
1081 DEBUG_REQ(D_ERROR, req,
1082 "IBITS lock request from unaware client?");
1083 GOTO(out, rc = -EPROTO);
1087 /* FIXME this makes it impossible to use LDLM_PLAIN locks -- check
1088 against server's _CONNECT_SUPPORTED flags? (I don't want to use
1089 ibits for mgc/mgs) */
1091 /* INODEBITS_INTEROP: Perform conversion from plain lock to
1092 * inodebits lock if client does not support them. */
1093 if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) &&
1094 (dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN)) {
1095 dlm_req->lock_desc.l_resource.lr_type = LDLM_IBITS;
1096 dlm_req->lock_desc.l_policy_data.l_inodebits.bits =
1097 MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE;
1098 if (dlm_req->lock_desc.l_req_mode == LCK_PR)
1099 dlm_req->lock_desc.l_req_mode = LCK_CR;
1103 if (unlikely(flags & LDLM_FL_REPLAY)) {
1104 /* Find an existing lock in the per-export lock hash */
1105 lock = cfs_hash_lookup(req->rq_export->exp_lock_hash,
1106 (void *)&dlm_req->lock_handle[0]);
1108 DEBUG_REQ(D_DLMTRACE, req, "found existing lock cookie "
1109 LPX64, lock->l_handle.h_cookie);
1110 GOTO(existing_lock, rc = 0);
1114 /* The lock's callback data might be set in the policy function */
1115 lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
1116 dlm_req->lock_desc.l_resource.lr_type,
1117 dlm_req->lock_desc.l_req_mode,
1121 GOTO(out, rc = -ENOMEM);
1123 lock->l_last_activity = cfs_time_current_sec();
1124 lock->l_remote_handle = dlm_req->lock_handle[0];
1125 LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
1127 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
1128 /* Don't enqueue a lock onto the export if it is been disonnected
1129 * due to eviction (bug 3822) or server umount (bug 24324).
1130 * Cancel it now instead. */
1131 if (req->rq_export->exp_disconnected) {
1132 LDLM_ERROR(lock, "lock on disconnected export %p",
1134 GOTO(out, rc = -ENOTCONN);
1137 lock->l_export = class_export_lock_get(req->rq_export, lock);
1138 if (lock->l_export->exp_lock_hash)
1139 cfs_hash_add(lock->l_export->exp_lock_hash,
1140 &lock->l_remote_handle,
1145 if (flags & LDLM_FL_HAS_INTENT) {
1146 /* In this case, the reply buffer is allocated deep in
1147 * local_lock_enqueue by the policy function. */
1150 /* based on the assumption that lvb size never changes during
1151 * resource life time otherwise it need resource->lr_lock's
1153 if (lock->l_resource->lr_lvb_len) {
1154 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
1156 lock->l_resource->lr_lvb_len);
1159 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
1160 GOTO(out, rc = -ENOMEM);
1162 rc = req_capsule_server_pack(&req->rq_pill);
1167 if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN)
1168 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1169 if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
1170 lock->l_req_extent = lock->l_policy_data.l_extent;
1172 err = ldlm_lock_enqueue(ns, &lock, cookie, (int *)&flags);
1176 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1177 dlm_rep->lock_flags = flags;
1179 ldlm_lock2desc(lock, &dlm_rep->lock_desc);
1180 ldlm_lock2handle(lock, &dlm_rep->lock_handle);
1182 /* We never send a blocking AST until the lock is granted, but
1183 * we can tell it right now */
1184 lock_res_and_lock(lock);
1186 /* Now take into account flags to be inherited from original lock
1187 request both in reply to client and in our own lock flags. */
1188 dlm_rep->lock_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1189 lock->l_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS;
1191 /* Don't move a pending lock onto the export if it has already been
1192 * disconnected due to eviction (bug 5683) or server umount (bug 24324).
1193 * Cancel it now instead. */
1194 if (unlikely(req->rq_export->exp_disconnected ||
1195 OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
1196 LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
1198 } else if (lock->l_flags & LDLM_FL_AST_SENT) {
1199 dlm_rep->lock_flags |= LDLM_FL_AST_SENT;
1200 if (lock->l_granted_mode == lock->l_req_mode) {
1202 * Only cancel lock if it was granted, because it would
1203 * be destroyed immediately and would never be granted
1204 * in the future, causing timeouts on client. Not
1205 * granted lock will be cancelled immediately after
1206 * sending completion AST.
1208 if (dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK) {
1209 unlock_res_and_lock(lock);
1210 ldlm_lock_cancel(lock);
1211 lock_res_and_lock(lock);
1213 ldlm_add_waiting_lock(lock);
1216 /* Make sure we never ever grant usual metadata locks to liblustre
1218 if ((dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN ||
1219 dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) &&
1220 req->rq_export->exp_libclient) {
1221 if (unlikely(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) ||
1222 !(dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK))){
1223 CERROR("Granting sync lock to libclient. "
1224 "req fl %d, rep fl %d, lock fl "LPX64"\n",
1225 dlm_req->lock_flags, dlm_rep->lock_flags,
1227 LDLM_ERROR(lock, "sync lock");
1228 if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT) {
1229 struct ldlm_intent *it;
1231 it = req_capsule_client_get(&req->rq_pill,
1234 CERROR("This is intent %s ("LPU64")\n",
1235 ldlm_it2str(it->opc), it->opc);
1241 unlock_res_and_lock(lock);
1245 req->rq_status = rc ?: err; /* return either error - bug 11190 */
1246 if (!req->rq_packed_final) {
1247 err = lustre_pack_reply(req, 1, NULL, NULL);
1252 /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
1253 * ldlm_reprocess_all. If this moves, revisit that code. -phil */
1255 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
1256 "(err=%d, rc=%d)", err, rc);
1259 if (lock->l_resource->lr_lvb_len > 0) {
1260 /* MDT path won't handle lr_lvb_data, so
1261 * lock/unlock better be contained in the
1265 lvb = req_capsule_server_get(&req->rq_pill,
1267 LASSERTF(lvb != NULL, "req %p, lock %p\n",
1269 lock_res(lock->l_resource);
1270 memcpy(lvb, lock->l_resource->lr_lvb_data,
1271 lock->l_resource->lr_lvb_len);
1272 unlock_res(lock->l_resource);
1275 lock_res_and_lock(lock);
1276 ldlm_resource_unlink_lock(lock);
1277 ldlm_lock_destroy_nolock(lock);
1278 unlock_res_and_lock(lock);
1281 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
1282 ldlm_reprocess_all(lock->l_resource);
1284 LDLM_LOCK_RELEASE(lock);
1287 LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
1293 int ldlm_handle_enqueue(struct ptlrpc_request *req,
1294 ldlm_completion_callback completion_callback,
1295 ldlm_blocking_callback blocking_callback,
1296 ldlm_glimpse_callback glimpse_callback)
1298 struct ldlm_request *dlm_req;
1299 struct ldlm_callback_suite cbs = {
1300 .lcs_completion = completion_callback,
1301 .lcs_blocking = blocking_callback,
1302 .lcs_glimpse = glimpse_callback
1306 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1307 if (dlm_req != NULL) {
1308 rc = ldlm_handle_enqueue0(req->rq_export->exp_obd->obd_namespace,
1309 req, dlm_req, &cbs);
1316 int ldlm_handle_convert0(struct ptlrpc_request *req,
1317 const struct ldlm_request *dlm_req)
1319 struct ldlm_reply *dlm_rep;
1320 struct ldlm_lock *lock;
1324 if (req->rq_export && req->rq_export->exp_nid_stats &&
1325 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1326 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1327 LDLM_CONVERT - LDLM_FIRST_OPC);
1329 rc = req_capsule_server_pack(&req->rq_pill);
1333 dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
1334 dlm_rep->lock_flags = dlm_req->lock_flags;
1336 lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
1338 req->rq_status = EINVAL;
1342 LDLM_DEBUG(lock, "server-side convert handler START");
1344 lock->l_last_activity = cfs_time_current_sec();
1345 res = ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
1346 &dlm_rep->lock_flags);
1348 if (ldlm_del_waiting_lock(lock))
1349 LDLM_DEBUG(lock, "converted waiting lock");
1352 req->rq_status = EDEADLOCK;
1357 if (!req->rq_status)
1358 ldlm_reprocess_all(lock->l_resource);
1359 LDLM_DEBUG(lock, "server-side convert handler END");
1360 LDLM_LOCK_PUT(lock);
1362 LDLM_DEBUG_NOLOCK("server-side convert handler END");
1367 int ldlm_handle_convert(struct ptlrpc_request *req)
1370 struct ldlm_request *dlm_req;
1372 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1373 if (dlm_req != NULL) {
1374 rc = ldlm_handle_convert0(req, dlm_req);
1376 CERROR ("Can't unpack dlm_req\n");
1382 /* Cancel all the locks whos handles are packed into ldlm_request */
1383 int ldlm_request_cancel(struct ptlrpc_request *req,
1384 const struct ldlm_request *dlm_req, int first)
1386 struct ldlm_resource *res, *pres = NULL;
1387 struct ldlm_lock *lock;
1388 int i, count, done = 0;
1391 count = dlm_req->lock_count ? dlm_req->lock_count : 1;
1395 /* There is no lock on the server at the replay time,
1396 * skip lock cancelling to make replay tests to pass. */
1397 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1400 LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, "
1401 "starting at %d", count, first);
1403 for (i = first; i < count; i++) {
1404 lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
1406 LDLM_DEBUG_NOLOCK("server-side cancel handler stale "
1407 "lock (cookie "LPU64")",
1408 dlm_req->lock_handle[i].cookie);
1412 res = lock->l_resource;
1417 ldlm_reprocess_all(pres);
1418 LDLM_RESOURCE_DELREF(pres);
1419 ldlm_resource_putref(pres);
1422 ldlm_resource_getref(res);
1423 LDLM_RESOURCE_ADDREF(res);
1424 ldlm_res_lvbo_update(res, NULL, 1);
1428 ldlm_lock_cancel(lock);
1429 LDLM_LOCK_PUT(lock);
1432 ldlm_reprocess_all(pres);
1433 LDLM_RESOURCE_DELREF(pres);
1434 ldlm_resource_putref(pres);
1436 LDLM_DEBUG_NOLOCK("server-side cancel handler END");
1440 int ldlm_handle_cancel(struct ptlrpc_request *req)
1442 struct ldlm_request *dlm_req;
1446 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1447 if (dlm_req == NULL) {
1448 CDEBUG(D_INFO, "bad request buffer for cancel\n");
1452 if (req->rq_export && req->rq_export->exp_nid_stats &&
1453 req->rq_export->exp_nid_stats->nid_ldlm_stats)
1454 lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
1455 LDLM_CANCEL - LDLM_FIRST_OPC);
1457 rc = req_capsule_server_pack(&req->rq_pill);
1461 if (!ldlm_request_cancel(req, dlm_req, 0))
1462 req->rq_status = ESTALE;
1464 RETURN(ptlrpc_reply(req));
1467 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
1468 struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
1473 LDLM_DEBUG(lock, "client blocking AST callback handler");
1475 lock_res_and_lock(lock);
1476 lock->l_flags |= LDLM_FL_CBPENDING;
1478 if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
1479 lock->l_flags |= LDLM_FL_CANCEL;
1481 do_ast = (!lock->l_readers && !lock->l_writers);
1482 unlock_res_and_lock(lock);
1485 CDEBUG(D_DLMTRACE, "Lock %p already unused, calling callback (%p)\n",
1486 lock, lock->l_blocking_ast);
1487 if (lock->l_blocking_ast != NULL)
1488 lock->l_blocking_ast(lock, ld, lock->l_ast_data,
1491 CDEBUG(D_DLMTRACE, "Lock %p is referenced, will be cancelled later\n",
1495 LDLM_DEBUG(lock, "client blocking callback handler END");
1496 LDLM_LOCK_RELEASE(lock);
1500 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
1501 struct ldlm_namespace *ns,
1502 struct ldlm_request *dlm_req,
1503 struct ldlm_lock *lock)
1505 CFS_LIST_HEAD(ast_list);
1508 LDLM_DEBUG(lock, "client completion callback handler START");
1510 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) {
1511 int to = cfs_time_seconds(1);
1513 cfs_schedule_timeout_and_set_state(
1514 CFS_TASK_INTERRUPTIBLE, to);
1515 if (lock->l_granted_mode == lock->l_req_mode ||
1521 lock_res_and_lock(lock);
1522 if (lock->l_destroyed ||
1523 lock->l_granted_mode == lock->l_req_mode) {
1524 /* bug 11300: the lock has already been granted */
1525 unlock_res_and_lock(lock);
1526 LDLM_DEBUG(lock, "Double grant race happened");
1527 LDLM_LOCK_RELEASE(lock);
1532 /* If we receive the completion AST before the actual enqueue returned,
1533 * then we might need to switch lock modes, resources, or extents. */
1534 if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
1535 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
1536 LDLM_DEBUG(lock, "completion AST, new lock mode");
1539 if (lock->l_resource->lr_type != LDLM_PLAIN) {
1540 lock->l_policy_data = dlm_req->lock_desc.l_policy_data;
1541 LDLM_DEBUG(lock, "completion AST, new policy data");
1544 ldlm_resource_unlink_lock(lock);
1545 if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
1546 &lock->l_resource->lr_name,
1547 sizeof(lock->l_resource->lr_name)) != 0) {
1548 unlock_res_and_lock(lock);
1549 if (ldlm_lock_change_resource(ns, lock,
1550 &dlm_req->lock_desc.l_resource.lr_name) != 0) {
1551 LDLM_ERROR(lock, "Failed to allocate resource");
1552 LDLM_LOCK_RELEASE(lock);
1556 LDLM_DEBUG(lock, "completion AST, new resource");
1557 CERROR("change resource!\n");
1558 lock_res_and_lock(lock);
1561 if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
1562 /* BL_AST locks are not needed in lru.
1563 * let ldlm_cancel_lru() be fast. */
1564 ldlm_lock_remove_from_lru(lock);
1565 lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
1566 LDLM_DEBUG(lock, "completion AST includes blocking AST");
1569 if (lock->l_lvb_len) {
1570 if (req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB,
1571 RCL_CLIENT) < lock->l_lvb_len) {
1572 LDLM_ERROR(lock, "completion AST did not contain "
1575 void *lvb = req_capsule_client_get(&req->rq_pill,
1577 memcpy(lock->l_lvb_data, lvb, lock->l_lvb_len);
1581 ldlm_grant_lock(lock, &ast_list);
1582 unlock_res_and_lock(lock);
1584 LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
1586 /* Let Enqueue to call osc_lock_upcall() and initialize
1588 OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 2);
1590 ldlm_run_ast_work(&ast_list, LDLM_WORK_CP_AST);
1592 LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
1594 LDLM_LOCK_RELEASE(lock);
1598 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
1599 struct ldlm_namespace *ns,
1600 struct ldlm_request *dlm_req,
1601 struct ldlm_lock *lock)
1606 LDLM_DEBUG(lock, "client glimpse AST callback handler");
1608 if (lock->l_glimpse_ast != NULL)
1609 rc = lock->l_glimpse_ast(lock, req);
1611 if (req->rq_repmsg != NULL) {
1614 req->rq_status = rc;
1618 lock_res_and_lock(lock);
1619 if (lock->l_granted_mode == LCK_PW &&
1620 !lock->l_readers && !lock->l_writers &&
1621 cfs_time_after(cfs_time_current(),
1622 cfs_time_add(lock->l_last_used,
1623 cfs_time_seconds(10)))) {
1624 unlock_res_and_lock(lock);
1625 if (ldlm_bl_to_thread_lock(ns, NULL, lock))
1626 ldlm_handle_bl_callback(ns, NULL, lock);
1631 unlock_res_and_lock(lock);
1632 LDLM_LOCK_RELEASE(lock);
1636 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1638 if (req->rq_no_reply)
1641 req->rq_status = rc;
1642 if (!req->rq_packed_final) {
1643 rc = lustre_pack_reply(req, 1, NULL, NULL);
1647 return ptlrpc_reply(req);
1651 static int __ldlm_bl_to_thread(struct ldlm_bl_work_item *blwi, int mode)
1653 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1656 cfs_spin_lock(&blp->blp_lock);
1657 if (blwi->blwi_lock && blwi->blwi_lock->l_flags & LDLM_FL_DISCARD_DATA) {
1658 /* add LDLM_FL_DISCARD_DATA requests to the priority list */
1659 cfs_list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
1661 /* other blocking callbacks are added to the regular list */
1662 cfs_list_add_tail(&blwi->blwi_entry, &blp->blp_list);
1664 cfs_spin_unlock(&blp->blp_lock);
1666 cfs_waitq_signal(&blp->blp_waitq);
1668 /* can not use blwi->blwi_mode as blwi could be already freed in
1670 if (mode == LDLM_SYNC)
1671 cfs_wait_for_completion(&blwi->blwi_comp);
1676 static inline void init_blwi(struct ldlm_bl_work_item *blwi,
1677 struct ldlm_namespace *ns,
1678 struct ldlm_lock_desc *ld,
1679 cfs_list_t *cancels, int count,
1680 struct ldlm_lock *lock,
1683 cfs_init_completion(&blwi->blwi_comp);
1684 CFS_INIT_LIST_HEAD(&blwi->blwi_head);
1686 if (cfs_memory_pressure_get())
1687 blwi->blwi_mem_pressure = 1;
1690 blwi->blwi_mode = mode;
1692 blwi->blwi_ld = *ld;
1694 cfs_list_add(&blwi->blwi_head, cancels);
1695 cfs_list_del_init(cancels);
1696 blwi->blwi_count = count;
1698 blwi->blwi_lock = lock;
1702 static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
1703 struct ldlm_lock_desc *ld, struct ldlm_lock *lock,
1704 cfs_list_t *cancels, int count, int mode)
1708 if (cancels && count == 0)
1711 if (mode == LDLM_SYNC) {
1712 /* if it is synchronous call do minimum mem alloc, as it could
1713 * be triggered from kernel shrinker
1715 struct ldlm_bl_work_item blwi;
1716 memset(&blwi, 0, sizeof(blwi));
1717 init_blwi(&blwi, ns, ld, cancels, count, lock, LDLM_SYNC);
1718 RETURN(__ldlm_bl_to_thread(&blwi, LDLM_SYNC));
1720 struct ldlm_bl_work_item *blwi;
1721 OBD_ALLOC(blwi, sizeof(*blwi));
1724 init_blwi(blwi, ns, ld, cancels, count, lock, LDLM_ASYNC);
1726 RETURN(__ldlm_bl_to_thread(blwi, LDLM_ASYNC));
1732 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1733 struct ldlm_lock *lock)
1736 RETURN(ldlm_bl_to_thread(ns, ld, lock, NULL, 0, LDLM_ASYNC));
1742 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1743 cfs_list_t *cancels, int count, int mode)
1746 RETURN(ldlm_bl_to_thread(ns, ld, NULL, cancels, count, mode));
1752 /* Setinfo coming from Server (eg MDT) to Client (eg MDC)! */
1753 static int ldlm_handle_setinfo(struct ptlrpc_request *req)
1755 struct obd_device *obd = req->rq_export->exp_obd;
1762 DEBUG_REQ(D_HSM, req, "%s: handle setinfo\n", obd->obd_name);
1764 req_capsule_set(&req->rq_pill, &RQF_OBD_SET_INFO);
1766 key = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
1768 DEBUG_REQ(D_IOCTL, req, "no set_info key");
1771 keylen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_KEY,
1773 val = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
1775 DEBUG_REQ(D_IOCTL, req, "no set_info val");
1778 vallen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_VAL,
1781 /* We are responsible for swabbing contents of val */
1783 if (KEY_IS(KEY_HSM_COPYTOOL_SEND))
1784 /* Pass it on to mdc (the "export" in this case) */
1785 rc = obd_set_info_async(req->rq_export,
1786 sizeof(KEY_HSM_COPYTOOL_SEND),
1787 KEY_HSM_COPYTOOL_SEND,
1790 DEBUG_REQ(D_WARNING, req, "ignoring unknown key %s", key);
1795 static inline void ldlm_callback_errmsg(struct ptlrpc_request *req,
1796 const char *msg, int rc,
1797 struct lustre_handle *handle)
1799 DEBUG_REQ((req->rq_no_reply || rc) ? D_WARNING : D_DLMTRACE, req,
1800 "%s: [nid %s] [rc %d] [lock "LPX64"]",
1801 msg, libcfs_id2str(req->rq_peer), rc,
1802 handle ? handle->cookie : 0);
1803 if (req->rq_no_reply)
1804 CWARN("No reply was sent, maybe cause bug 21636.\n");
1806 CWARN("Send reply failed, maybe cause bug 21636.\n");
1809 /* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */
1810 static int ldlm_callback_handler(struct ptlrpc_request *req)
1812 struct ldlm_namespace *ns;
1813 struct ldlm_request *dlm_req;
1814 struct ldlm_lock *lock;
1818 /* Requests arrive in sender's byte order. The ptlrpc service
1819 * handler has already checked and, if necessary, byte-swapped the
1820 * incoming request message body, but I am responsible for the
1821 * message buffers. */
1823 /* do nothing for sec context finalize */
1824 if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI)
1827 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
1829 if (req->rq_export == NULL) {
1830 rc = ldlm_callback_reply(req, -ENOTCONN);
1831 ldlm_callback_errmsg(req, "Operate on unconnected server",
1836 LASSERT(req->rq_export != NULL);
1837 LASSERT(req->rq_export->exp_obd != NULL);
1839 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1840 case LDLM_BL_CALLBACK:
1841 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK))
1844 case LDLM_CP_CALLBACK:
1845 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK))
1848 case LDLM_GL_CALLBACK:
1849 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK))
1853 rc = ldlm_handle_setinfo(req);
1854 ldlm_callback_reply(req, rc);
1856 case OBD_LOG_CANCEL: /* remove this eventually - for 1.4.0 compat */
1857 CERROR("shouldn't be handling OBD_LOG_CANCEL on DLM thread\n");
1858 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
1859 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
1861 rc = llog_origin_handle_cancel(req);
1862 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_REP))
1864 ldlm_callback_reply(req, rc);
1866 case OBD_QC_CALLBACK:
1867 req_capsule_set(&req->rq_pill, &RQF_QC_CALLBACK);
1868 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_QC_CALLBACK_NET))
1870 rc = target_handle_qc_callback(req);
1871 ldlm_callback_reply(req, rc);
1875 /* reply in handler */
1876 req_capsule_set(&req->rq_pill, &RQF_MDS_QUOTA_DQACQ);
1877 rc = target_handle_dqacq_callback(req);
1879 case LLOG_ORIGIN_HANDLE_CREATE:
1880 req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
1881 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1883 rc = llog_origin_handle_create(req);
1884 ldlm_callback_reply(req, rc);
1886 case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
1887 req_capsule_set(&req->rq_pill,
1888 &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
1889 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1891 rc = llog_origin_handle_next_block(req);
1892 ldlm_callback_reply(req, rc);
1894 case LLOG_ORIGIN_HANDLE_READ_HEADER:
1895 req_capsule_set(&req->rq_pill,
1896 &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER);
1897 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1899 rc = llog_origin_handle_read_header(req);
1900 ldlm_callback_reply(req, rc);
1902 case LLOG_ORIGIN_HANDLE_CLOSE:
1903 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
1905 rc = llog_origin_handle_close(req);
1906 ldlm_callback_reply(req, rc);
1909 CERROR("unknown opcode %u\n",
1910 lustre_msg_get_opc(req->rq_reqmsg));
1911 ldlm_callback_reply(req, -EPROTO);
1915 ns = req->rq_export->exp_obd->obd_namespace;
1916 LASSERT(ns != NULL);
1918 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
1920 dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
1921 if (dlm_req == NULL) {
1922 rc = ldlm_callback_reply(req, -EPROTO);
1923 ldlm_callback_errmsg(req, "Operate without parameter", rc,
1928 /* Force a known safe race, send a cancel to the server for a lock
1929 * which the server has already started a blocking callback on. */
1930 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE) &&
1931 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1932 rc = ldlm_cli_cancel(&dlm_req->lock_handle[0]);
1934 CERROR("ldlm_cli_cancel: %d\n", rc);
1937 lock = ldlm_handle2lock_long(&dlm_req->lock_handle[0], 0);
1939 CDEBUG(D_DLMTRACE, "callback on lock "LPX64" - lock "
1940 "disappeared\n", dlm_req->lock_handle[0].cookie);
1941 rc = ldlm_callback_reply(req, -EINVAL);
1942 ldlm_callback_errmsg(req, "Operate with invalid parameter", rc,
1943 &dlm_req->lock_handle[0]);
1947 if ((lock->l_flags & LDLM_FL_FAIL_LOC) &&
1948 lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK)
1949 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
1951 /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
1952 lock_res_and_lock(lock);
1953 lock->l_flags |= (dlm_req->lock_flags & LDLM_AST_FLAGS);
1954 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
1955 /* If somebody cancels lock and cache is already dropped,
1956 * or lock is failed before cp_ast received on client,
1957 * we can tell the server we have no lock. Otherwise, we
1958 * should send cancel after dropping the cache. */
1959 if (((lock->l_flags & LDLM_FL_CANCELING) &&
1960 (lock->l_flags & LDLM_FL_BL_DONE)) ||
1961 (lock->l_flags & LDLM_FL_FAILED)) {
1962 LDLM_DEBUG(lock, "callback on lock "
1963 LPX64" - lock disappeared\n",
1964 dlm_req->lock_handle[0].cookie);
1965 unlock_res_and_lock(lock);
1966 LDLM_LOCK_RELEASE(lock);
1967 rc = ldlm_callback_reply(req, -EINVAL);
1968 ldlm_callback_errmsg(req, "Operate on stale lock", rc,
1969 &dlm_req->lock_handle[0]);
1972 /* BL_AST locks are not needed in lru.
1973 * let ldlm_cancel_lru() be fast. */
1974 ldlm_lock_remove_from_lru(lock);
1975 lock->l_flags |= LDLM_FL_BL_AST;
1977 unlock_res_and_lock(lock);
1979 /* We want the ost thread to get this reply so that it can respond
1980 * to ost requests (write cache writeback) that might be triggered
1983 * But we'd also like to be able to indicate in the reply that we're
1984 * cancelling right now, because it's unused, or have an intent result
1985 * in the reply, so we might have to push the responsibility for sending
1986 * the reply down into the AST handlers, alas. */
1988 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1989 case LDLM_BL_CALLBACK:
1990 CDEBUG(D_INODE, "blocking ast\n");
1991 req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
1992 if (!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)) {
1993 rc = ldlm_callback_reply(req, 0);
1994 if (req->rq_no_reply || rc)
1995 ldlm_callback_errmsg(req, "Normal process", rc,
1996 &dlm_req->lock_handle[0]);
1998 if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
1999 ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
2001 case LDLM_CP_CALLBACK:
2002 CDEBUG(D_INODE, "completion ast\n");
2003 req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
2004 ldlm_callback_reply(req, 0);
2005 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
2007 case LDLM_GL_CALLBACK:
2008 CDEBUG(D_INODE, "glimpse ast\n");
2009 req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
2010 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
2013 LBUG(); /* checked above */
2019 static int ldlm_cancel_handler(struct ptlrpc_request *req)
2024 /* Requests arrive in sender's byte order. The ptlrpc service
2025 * handler has already checked and, if necessary, byte-swapped the
2026 * incoming request message body, but I am responsible for the
2027 * message buffers. */
2029 req_capsule_init(&req->rq_pill, req, RCL_SERVER);
2031 if (req->rq_export == NULL) {
2032 struct ldlm_request *dlm_req;
2034 CERROR("%s from %s arrived at %lu with bad export cookie "
2036 ll_opcode2str(lustre_msg_get_opc(req->rq_reqmsg)),
2037 libcfs_nid2str(req->rq_peer.nid),
2038 req->rq_arrival_time.tv_sec,
2039 lustre_msg_get_handle(req->rq_reqmsg)->cookie);
2041 if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_CANCEL) {
2042 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2043 dlm_req = req_capsule_client_get(&req->rq_pill,
2045 if (dlm_req != NULL)
2046 ldlm_lock_dump_handle(D_ERROR,
2047 &dlm_req->lock_handle[0]);
2049 ldlm_callback_reply(req, -ENOTCONN);
2053 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2055 /* XXX FIXME move this back to mds/handler.c, bug 249 */
2057 req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
2058 CDEBUG(D_INODE, "cancel\n");
2059 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL))
2061 rc = ldlm_handle_cancel(req);
2065 case OBD_LOG_CANCEL:
2066 req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
2067 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
2069 rc = llog_origin_handle_cancel(req);
2070 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_REP))
2072 ldlm_callback_reply(req, rc);
2075 CERROR("invalid opcode %d\n",
2076 lustre_msg_get_opc(req->rq_reqmsg));
2077 req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
2078 ldlm_callback_reply(req, -EINVAL);
2084 int ldlm_revoke_lock_cb(cfs_hash_t *hs, cfs_hash_bd_t *bd,
2085 cfs_hlist_node_t *hnode, void *data)
2088 cfs_list_t *rpc_list = data;
2089 struct ldlm_lock *lock = cfs_hash_object(hs, hnode);
2091 lock_res_and_lock(lock);
2093 if (lock->l_req_mode != lock->l_granted_mode) {
2094 unlock_res_and_lock(lock);
2098 LASSERT(lock->l_resource);
2099 if (lock->l_resource->lr_type != LDLM_IBITS &&
2100 lock->l_resource->lr_type != LDLM_PLAIN) {
2101 unlock_res_and_lock(lock);
2105 if (lock->l_flags & LDLM_FL_AST_SENT) {
2106 unlock_res_and_lock(lock);
2110 LASSERT(lock->l_blocking_ast);
2111 LASSERT(!lock->l_blocking_lock);
2113 lock->l_flags |= LDLM_FL_AST_SENT;
2114 if (lock->l_export && lock->l_export->exp_lock_hash &&
2115 !cfs_hlist_unhashed(&lock->l_exp_hash))
2116 cfs_hash_del(lock->l_export->exp_lock_hash,
2117 &lock->l_remote_handle, &lock->l_exp_hash);
2118 cfs_list_add_tail(&lock->l_rk_ast, rpc_list);
2119 LDLM_LOCK_GET(lock);
2121 unlock_res_and_lock(lock);
2125 void ldlm_revoke_export_locks(struct obd_export *exp)
2127 cfs_list_t rpc_list;
2130 CFS_INIT_LIST_HEAD(&rpc_list);
2131 cfs_hash_for_each_empty(exp->exp_lock_hash,
2132 ldlm_revoke_lock_cb, &rpc_list);
2133 ldlm_run_ast_work(&rpc_list, LDLM_WORK_REVOKE_AST);
2139 static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp)
2141 struct ldlm_bl_work_item *blwi = NULL;
2142 static unsigned int num_bl = 0;
2144 cfs_spin_lock(&blp->blp_lock);
2145 /* process a request from the blp_list at least every blp_num_threads */
2146 if (!cfs_list_empty(&blp->blp_list) &&
2147 (cfs_list_empty(&blp->blp_prio_list) || num_bl == 0))
2148 blwi = cfs_list_entry(blp->blp_list.next,
2149 struct ldlm_bl_work_item, blwi_entry);
2151 if (!cfs_list_empty(&blp->blp_prio_list))
2152 blwi = cfs_list_entry(blp->blp_prio_list.next,
2153 struct ldlm_bl_work_item,
2157 if (++num_bl >= cfs_atomic_read(&blp->blp_num_threads))
2159 cfs_list_del(&blwi->blwi_entry);
2161 cfs_spin_unlock(&blp->blp_lock);
2166 /* This only contains temporary data until the thread starts */
2167 struct ldlm_bl_thread_data {
2168 char bltd_name[CFS_CURPROC_COMM_MAX];
2169 struct ldlm_bl_pool *bltd_blp;
2170 cfs_completion_t bltd_comp;
2174 static int ldlm_bl_thread_main(void *arg);
2176 static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp)
2178 struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
2181 cfs_init_completion(&bltd.bltd_comp);
2182 rc = cfs_kernel_thread(ldlm_bl_thread_main, &bltd, 0);
2184 CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %d\n",
2185 cfs_atomic_read(&blp->blp_num_threads), rc);
2188 cfs_wait_for_completion(&bltd.bltd_comp);
2193 static int ldlm_bl_thread_main(void *arg)
2195 struct ldlm_bl_pool *blp;
2199 struct ldlm_bl_thread_data *bltd = arg;
2201 blp = bltd->bltd_blp;
2204 cfs_atomic_inc_return(&blp->blp_num_threads) - 1;
2205 cfs_atomic_inc(&blp->blp_busy_threads);
2207 snprintf(bltd->bltd_name, sizeof(bltd->bltd_name) - 1,
2208 "ldlm_bl_%02d", bltd->bltd_num);
2209 cfs_daemonize(bltd->bltd_name);
2211 cfs_complete(&bltd->bltd_comp);
2212 /* cannot use bltd after this, it is only on caller's stack */
2216 struct l_wait_info lwi = { 0 };
2217 struct ldlm_bl_work_item *blwi = NULL;
2219 blwi = ldlm_bl_get_work(blp);
2224 cfs_atomic_dec(&blp->blp_busy_threads);
2225 l_wait_event_exclusive(blp->blp_waitq,
2226 (blwi = ldlm_bl_get_work(blp)) != NULL,
2228 busy = cfs_atomic_inc_return(&blp->blp_busy_threads);
2230 if (blwi->blwi_ns == NULL)
2231 /* added by ldlm_cleanup() */
2234 /* Not fatal if racy and have a few too many threads */
2235 if (unlikely(busy < blp->blp_max_threads &&
2236 busy >= cfs_atomic_read(&blp->blp_num_threads) &&
2237 !blwi->blwi_mem_pressure))
2238 /* discard the return value, we tried */
2239 ldlm_bl_thread_start(blp);
2241 if (blwi->blwi_ns == NULL)
2242 /* added by ldlm_cleanup() */
2245 if (blwi->blwi_mem_pressure)
2246 cfs_memory_pressure_set();
2248 if (blwi->blwi_count) {
2250 /* The special case when we cancel locks in lru
2251 * asynchronously, we pass the list of locks here.
2252 * Thus locks are marked LDLM_FL_CANCELING, but NOT
2253 * canceled locally yet. */
2254 count = ldlm_cli_cancel_list_local(&blwi->blwi_head,
2257 ldlm_cli_cancel_list(&blwi->blwi_head, count, NULL, 0);
2259 ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
2262 if (blwi->blwi_mem_pressure)
2263 cfs_memory_pressure_clr();
2265 if (blwi->blwi_mode == LDLM_ASYNC)
2266 OBD_FREE(blwi, sizeof(*blwi));
2268 cfs_complete(&blwi->blwi_comp);
2271 cfs_atomic_dec(&blp->blp_busy_threads);
2272 cfs_atomic_dec(&blp->blp_num_threads);
2273 cfs_complete(&blp->blp_comp);
2279 static int ldlm_setup(void);
2280 static int ldlm_cleanup(void);
2282 int ldlm_get_ref(void)
2286 cfs_mutex_down(&ldlm_ref_sem);
2287 if (++ldlm_refcount == 1) {
2292 cfs_mutex_up(&ldlm_ref_sem);
2297 void ldlm_put_ref(void)
2300 cfs_mutex_down(&ldlm_ref_sem);
2301 if (ldlm_refcount == 1) {
2302 int rc = ldlm_cleanup();
2304 CERROR("ldlm_cleanup failed: %d\n", rc);
2310 cfs_mutex_up(&ldlm_ref_sem);
2316 * Export handle<->lock hash operations.
2319 ldlm_export_lock_hash(cfs_hash_t *hs, void *key, unsigned mask)
2321 return cfs_hash_u64_hash(((struct lustre_handle *)key)->cookie, mask);
2325 ldlm_export_lock_key(cfs_hlist_node_t *hnode)
2327 struct ldlm_lock *lock;
2329 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2330 return &lock->l_remote_handle;
2334 ldlm_export_lock_keycpy(cfs_hlist_node_t *hnode, void *key)
2336 struct ldlm_lock *lock;
2338 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2339 lock->l_remote_handle = *(struct lustre_handle *)key;
2343 ldlm_export_lock_keycmp(void *key, cfs_hlist_node_t *hnode)
2345 return lustre_handle_equal(ldlm_export_lock_key(hnode), key);
2349 ldlm_export_lock_object(cfs_hlist_node_t *hnode)
2351 return cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2355 ldlm_export_lock_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
2357 struct ldlm_lock *lock;
2359 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2360 LDLM_LOCK_GET(lock);
2364 ldlm_export_lock_put(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
2366 struct ldlm_lock *lock;
2368 lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
2369 LDLM_LOCK_RELEASE(lock);
2372 static cfs_hash_ops_t ldlm_export_lock_ops = {
2373 .hs_hash = ldlm_export_lock_hash,
2374 .hs_key = ldlm_export_lock_key,
2375 .hs_keycmp = ldlm_export_lock_keycmp,
2376 .hs_keycpy = ldlm_export_lock_keycpy,
2377 .hs_object = ldlm_export_lock_object,
2378 .hs_get = ldlm_export_lock_get,
2379 .hs_put = ldlm_export_lock_put,
2380 .hs_put_locked = ldlm_export_lock_put,
2383 int ldlm_init_export(struct obd_export *exp)
2387 exp->exp_lock_hash =
2388 cfs_hash_create(obd_uuid2str(&exp->exp_client_uuid),
2389 HASH_EXP_LOCK_CUR_BITS,
2390 HASH_EXP_LOCK_MAX_BITS,
2391 HASH_EXP_LOCK_BKT_BITS, 0,
2392 CFS_HASH_MIN_THETA, CFS_HASH_MAX_THETA,
2393 &ldlm_export_lock_ops,
2394 CFS_HASH_DEFAULT | CFS_HASH_REHASH_KEY |
2395 CFS_HASH_NBLK_CHANGE);
2397 if (!exp->exp_lock_hash)
2402 EXPORT_SYMBOL(ldlm_init_export);
2404 void ldlm_destroy_export(struct obd_export *exp)
2407 cfs_hash_putref(exp->exp_lock_hash);
2408 exp->exp_lock_hash = NULL;
2411 EXPORT_SYMBOL(ldlm_destroy_export);
2413 static int ldlm_setup(void)
2415 struct ldlm_bl_pool *blp;
2417 int ldlm_min_threads = LDLM_THREADS_AUTO_MIN;
2418 int ldlm_max_threads = LDLM_THREADS_AUTO_MAX;
2424 if (ldlm_state != NULL)
2427 OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
2428 if (ldlm_state == NULL)
2432 rc = ldlm_proc_setup();
2438 if (ldlm_num_threads) {
2439 /* If ldlm_num_threads is set, it is the min and the max. */
2440 if (ldlm_num_threads > LDLM_THREADS_AUTO_MAX)
2441 ldlm_num_threads = LDLM_THREADS_AUTO_MAX;
2442 if (ldlm_num_threads < LDLM_THREADS_AUTO_MIN)
2443 ldlm_num_threads = LDLM_THREADS_AUTO_MIN;
2444 ldlm_min_threads = ldlm_max_threads = ldlm_num_threads;
2448 ldlm_state->ldlm_cb_service =
2449 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2450 LDLM_MAXREPSIZE, LDLM_CB_REQUEST_PORTAL,
2451 LDLM_CB_REPLY_PORTAL, 2,
2452 ldlm_callback_handler, "ldlm_cbd",
2453 ldlm_svc_proc_dir, NULL,
2454 ldlm_min_threads, ldlm_max_threads,
2456 LCT_MD_THREAD|LCT_DT_THREAD, NULL);
2458 if (!ldlm_state->ldlm_cb_service) {
2459 CERROR("failed to start service\n");
2460 GOTO(out_proc, rc = -ENOMEM);
2463 ldlm_state->ldlm_cancel_service =
2464 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
2465 LDLM_MAXREPSIZE, LDLM_CANCEL_REQUEST_PORTAL,
2466 LDLM_CANCEL_REPLY_PORTAL, 6,
2467 ldlm_cancel_handler, "ldlm_canceld",
2468 ldlm_svc_proc_dir, NULL,
2469 ldlm_min_threads, ldlm_max_threads,
2471 LCT_MD_THREAD|LCT_DT_THREAD|LCT_CL_THREAD,
2474 if (!ldlm_state->ldlm_cancel_service) {
2475 CERROR("failed to start service\n");
2476 GOTO(out_proc, rc = -ENOMEM);
2479 OBD_ALLOC(blp, sizeof(*blp));
2481 GOTO(out_proc, rc = -ENOMEM);
2482 ldlm_state->ldlm_bl_pool = blp;
2484 cfs_spin_lock_init(&blp->blp_lock);
2485 CFS_INIT_LIST_HEAD(&blp->blp_list);
2486 CFS_INIT_LIST_HEAD(&blp->blp_prio_list);
2487 cfs_waitq_init(&blp->blp_waitq);
2488 cfs_atomic_set(&blp->blp_num_threads, 0);
2489 cfs_atomic_set(&blp->blp_busy_threads, 0);
2490 blp->blp_min_threads = ldlm_min_threads;
2491 blp->blp_max_threads = ldlm_max_threads;
2494 for (i = 0; i < blp->blp_min_threads; i++) {
2495 rc = ldlm_bl_thread_start(blp);
2497 GOTO(out_thread, rc);
2500 rc = ptlrpc_start_threads(ldlm_state->ldlm_cancel_service);
2502 GOTO(out_thread, rc);
2504 rc = ptlrpc_start_threads(ldlm_state->ldlm_cb_service);
2506 GOTO(out_thread, rc);
2508 CFS_INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
2509 expired_lock_thread.elt_state = ELT_STOPPED;
2510 cfs_waitq_init(&expired_lock_thread.elt_waitq);
2512 CFS_INIT_LIST_HEAD(&waiting_locks_list);
2513 cfs_spin_lock_init(&waiting_locks_spinlock);
2514 cfs_timer_init(&waiting_locks_timer, waiting_locks_callback, 0);
2516 rc = cfs_kernel_thread(expired_lock_main, NULL, CLONE_VM | CLONE_FILES);
2518 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
2519 GOTO(out_thread, rc);
2522 cfs_wait_event(expired_lock_thread.elt_waitq,
2523 expired_lock_thread.elt_state == ELT_READY);
2527 rc = ldlm_pools_init();
2529 GOTO(out_thread, rc);
2535 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2536 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2541 ldlm_proc_cleanup();
2544 OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2549 static int ldlm_cleanup(void)
2552 struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
2556 if (!cfs_list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) ||
2557 !cfs_list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) {
2558 CERROR("ldlm still has namespaces; clean these up first.\n");
2559 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
2560 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
2569 while (cfs_atomic_read(&blp->blp_num_threads) > 0) {
2570 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
2572 cfs_init_completion(&blp->blp_comp);
2574 cfs_spin_lock(&blp->blp_lock);
2575 cfs_list_add_tail(&blwi.blwi_entry, &blp->blp_list);
2576 cfs_waitq_signal(&blp->blp_waitq);
2577 cfs_spin_unlock(&blp->blp_lock);
2579 cfs_wait_for_completion(&blp->blp_comp);
2581 OBD_FREE(blp, sizeof(*blp));
2583 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2584 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2585 ldlm_proc_cleanup();
2587 expired_lock_thread.elt_state = ELT_TERMINATE;
2588 cfs_waitq_signal(&expired_lock_thread.elt_waitq);
2589 cfs_wait_event(expired_lock_thread.elt_waitq,
2590 expired_lock_thread.elt_state == ELT_STOPPED);
2592 ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
2593 ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
2596 OBD_FREE(ldlm_state, sizeof(*ldlm_state));
2602 int __init ldlm_init(void)
2604 cfs_init_mutex(&ldlm_ref_sem);
2605 cfs_init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER));
2606 cfs_init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
2607 ldlm_resource_slab = cfs_mem_cache_create("ldlm_resources",
2608 sizeof(struct ldlm_resource), 0,
2609 CFS_SLAB_HWCACHE_ALIGN);
2610 if (ldlm_resource_slab == NULL)
2613 ldlm_lock_slab = cfs_mem_cache_create("ldlm_locks",
2614 sizeof(struct ldlm_lock), 0,
2615 CFS_SLAB_HWCACHE_ALIGN | CFS_SLAB_DESTROY_BY_RCU);
2616 if (ldlm_lock_slab == NULL) {
2617 cfs_mem_cache_destroy(ldlm_resource_slab);
2621 ldlm_interval_slab = cfs_mem_cache_create("interval_node",
2622 sizeof(struct ldlm_interval),
2623 0, CFS_SLAB_HWCACHE_ALIGN);
2624 if (ldlm_interval_slab == NULL) {
2625 cfs_mem_cache_destroy(ldlm_resource_slab);
2626 cfs_mem_cache_destroy(ldlm_lock_slab);
2629 #if LUSTRE_TRACKS_LOCK_EXP_REFS
2630 class_export_dump_hook = ldlm_dump_export_locks;
2635 void __exit ldlm_exit(void)
2639 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
2640 rc = cfs_mem_cache_destroy(ldlm_resource_slab);
2641 LASSERTF(rc == 0, "couldn't free ldlm resource slab\n");
2643 /* ldlm_lock_put() use RCU to call ldlm_lock_free, so need call
2644 * synchronize_rcu() to wait a grace period elapsed, so that
2645 * ldlm_lock_free() get a chance to be called. */
2648 rc = cfs_mem_cache_destroy(ldlm_lock_slab);
2649 LASSERTF(rc == 0, "couldn't free ldlm lock slab\n");
2650 rc = cfs_mem_cache_destroy(ldlm_interval_slab);
2651 LASSERTF(rc == 0, "couldn't free interval node slab\n");
2655 EXPORT_SYMBOL(ldlm_extent_shift_kms);
2658 EXPORT_SYMBOL(ldlm_get_processing_policy);
2659 EXPORT_SYMBOL(ldlm_lock2desc);
2660 EXPORT_SYMBOL(ldlm_register_intent);
2661 EXPORT_SYMBOL(ldlm_lockname);
2662 EXPORT_SYMBOL(ldlm_typename);
2663 EXPORT_SYMBOL(ldlm_lock2handle);
2664 EXPORT_SYMBOL(__ldlm_handle2lock);
2665 EXPORT_SYMBOL(ldlm_lock_get);
2666 EXPORT_SYMBOL(ldlm_lock_put);
2667 EXPORT_SYMBOL(ldlm_lock_match);
2668 EXPORT_SYMBOL(ldlm_lock_cancel);
2669 EXPORT_SYMBOL(ldlm_lock_addref);
2670 EXPORT_SYMBOL(ldlm_lock_addref_try);
2671 EXPORT_SYMBOL(ldlm_lock_decref);
2672 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
2673 EXPORT_SYMBOL(ldlm_lock_change_resource);
2674 EXPORT_SYMBOL(ldlm_it2str);
2675 EXPORT_SYMBOL(ldlm_lock_dump);
2676 EXPORT_SYMBOL(ldlm_lock_dump_handle);
2677 EXPORT_SYMBOL(ldlm_reprocess_all_ns);
2678 EXPORT_SYMBOL(ldlm_lock_allow_match_locked);
2679 EXPORT_SYMBOL(ldlm_lock_allow_match);
2680 EXPORT_SYMBOL(ldlm_lock_downgrade);
2681 EXPORT_SYMBOL(ldlm_lock_convert);
2683 /* ldlm_request.c */
2684 EXPORT_SYMBOL(ldlm_completion_ast_async);
2685 EXPORT_SYMBOL(ldlm_blocking_ast_nocheck);
2686 EXPORT_SYMBOL(ldlm_completion_ast);
2687 EXPORT_SYMBOL(ldlm_blocking_ast);
2688 EXPORT_SYMBOL(ldlm_glimpse_ast);
2689 EXPORT_SYMBOL(ldlm_expired_completion_wait);
2690 EXPORT_SYMBOL(ldlm_prep_enqueue_req);
2691 EXPORT_SYMBOL(ldlm_prep_elc_req);
2692 EXPORT_SYMBOL(ldlm_cli_convert);
2693 EXPORT_SYMBOL(ldlm_cli_enqueue);
2694 EXPORT_SYMBOL(ldlm_cli_enqueue_fini);
2695 EXPORT_SYMBOL(ldlm_cli_enqueue_local);
2696 EXPORT_SYMBOL(ldlm_cli_cancel);
2697 EXPORT_SYMBOL(ldlm_cli_cancel_unused);
2698 EXPORT_SYMBOL(ldlm_cli_cancel_unused_resource);
2699 EXPORT_SYMBOL(ldlm_cli_cancel_req);
2700 EXPORT_SYMBOL(ldlm_replay_locks);
2701 EXPORT_SYMBOL(ldlm_resource_foreach);
2702 EXPORT_SYMBOL(ldlm_namespace_foreach);
2703 EXPORT_SYMBOL(ldlm_resource_iterate);
2704 EXPORT_SYMBOL(ldlm_cancel_resource_local);
2705 EXPORT_SYMBOL(ldlm_cli_cancel_list_local);
2706 EXPORT_SYMBOL(ldlm_cli_cancel_list);
2709 EXPORT_SYMBOL(ldlm_server_blocking_ast);
2710 EXPORT_SYMBOL(ldlm_server_completion_ast);
2711 EXPORT_SYMBOL(ldlm_server_glimpse_ast);
2712 EXPORT_SYMBOL(ldlm_handle_enqueue);
2713 EXPORT_SYMBOL(ldlm_handle_enqueue0);
2714 EXPORT_SYMBOL(ldlm_handle_cancel);
2715 EXPORT_SYMBOL(ldlm_request_cancel);
2716 EXPORT_SYMBOL(ldlm_handle_convert);
2717 EXPORT_SYMBOL(ldlm_handle_convert0);
2718 EXPORT_SYMBOL(ldlm_del_waiting_lock);
2719 EXPORT_SYMBOL(ldlm_get_ref);
2720 EXPORT_SYMBOL(ldlm_put_ref);
2721 EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
2722 EXPORT_SYMBOL(ldlm_revoke_export_locks);
2724 /* ldlm_resource.c */
2725 EXPORT_SYMBOL(ldlm_namespace_new);
2726 EXPORT_SYMBOL(ldlm_namespace_cleanup);
2727 EXPORT_SYMBOL(ldlm_namespace_free);
2728 EXPORT_SYMBOL(ldlm_namespace_dump);
2729 EXPORT_SYMBOL(ldlm_dump_all_namespaces);
2730 EXPORT_SYMBOL(ldlm_resource_get);
2731 EXPORT_SYMBOL(ldlm_resource_putref);
2732 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
2735 EXPORT_SYMBOL(client_import_add_conn);
2736 EXPORT_SYMBOL(client_import_del_conn);
2737 EXPORT_SYMBOL(client_obd_setup);
2738 EXPORT_SYMBOL(client_obd_cleanup);
2739 EXPORT_SYMBOL(client_connect_import);
2740 EXPORT_SYMBOL(client_disconnect_export);
2741 EXPORT_SYMBOL(server_disconnect_export);
2742 EXPORT_SYMBOL(target_stop_recovery_thread);
2743 EXPORT_SYMBOL(target_handle_connect);
2744 EXPORT_SYMBOL(target_cleanup_recovery);
2745 EXPORT_SYMBOL(target_destroy_export);
2746 EXPORT_SYMBOL(target_cancel_recovery_timer);
2747 EXPORT_SYMBOL(target_send_reply);
2748 EXPORT_SYMBOL(target_queue_recovery_request);
2749 EXPORT_SYMBOL(target_handle_ping);
2750 EXPORT_SYMBOL(target_pack_pool_reply);
2751 EXPORT_SYMBOL(target_handle_disconnect);
2754 EXPORT_SYMBOL(lock_res_and_lock);
2755 EXPORT_SYMBOL(unlock_res_and_lock);