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.
32 * Copyright (c) 2011 Whamcloud, Inc.
36 * This file is part of Lustre, http://www.lustre.org/
37 * Lustre is a trademark of Sun Microsystems, Inc.
39 * lustre/ldlm/ldlm_lock.c
41 * Author: Peter Braam <braam@clusterfs.com>
42 * Author: Phil Schwan <phil@clusterfs.com>
45 #define DEBUG_SUBSYSTEM S_LDLM
48 # include <libcfs/libcfs.h>
49 # include <linux/lustre_intent.h>
51 # include <liblustre.h>
54 #include <obd_class.h>
55 #include "ldlm_internal.h"
58 char *ldlm_lockname[] = {
70 char *ldlm_typename[] = {
77 static ldlm_policy_wire_to_local_t ldlm_policy_wire_to_local[] = {
78 [LDLM_PLAIN - LDLM_MIN_TYPE] ldlm_plain_policy_wire_to_local,
79 [LDLM_EXTENT - LDLM_MIN_TYPE] ldlm_extent_policy_wire_to_local,
80 [LDLM_FLOCK - LDLM_MIN_TYPE] ldlm_flock_policy_wire_to_local,
81 [LDLM_IBITS - LDLM_MIN_TYPE] ldlm_ibits_policy_wire_to_local,
84 static ldlm_policy_local_to_wire_t ldlm_policy_local_to_wire[] = {
85 [LDLM_PLAIN - LDLM_MIN_TYPE] ldlm_plain_policy_local_to_wire,
86 [LDLM_EXTENT - LDLM_MIN_TYPE] ldlm_extent_policy_local_to_wire,
87 [LDLM_FLOCK - LDLM_MIN_TYPE] ldlm_flock_policy_local_to_wire,
88 [LDLM_IBITS - LDLM_MIN_TYPE] ldlm_ibits_policy_local_to_wire,
92 * Converts lock policy from local format to on the wire lock_desc format
94 void ldlm_convert_policy_to_wire(ldlm_type_t type,
95 const ldlm_policy_data_t *lpolicy,
96 ldlm_wire_policy_data_t *wpolicy)
98 ldlm_policy_local_to_wire_t convert;
100 convert = ldlm_policy_local_to_wire[type - LDLM_MIN_TYPE];
102 convert(lpolicy, wpolicy);
106 * Converts lock policy from on the wire lock_desc format to local format
108 void ldlm_convert_policy_to_local(ldlm_type_t type,
109 const ldlm_wire_policy_data_t *wpolicy,
110 ldlm_policy_data_t *lpolicy)
112 ldlm_policy_wire_to_local_t convert;
114 convert = ldlm_policy_wire_to_local[type - LDLM_MIN_TYPE];
116 convert(wpolicy, lpolicy);
119 char *ldlm_it2str(int it)
126 case (IT_OPEN | IT_CREAT):
139 CERROR("Unknown intent %d\n", it);
144 extern cfs_mem_cache_t *ldlm_lock_slab;
146 static ldlm_processing_policy ldlm_processing_policy_table[] = {
147 [LDLM_PLAIN] ldlm_process_plain_lock,
148 [LDLM_EXTENT] ldlm_process_extent_lock,
150 [LDLM_FLOCK] ldlm_process_flock_lock,
152 [LDLM_IBITS] ldlm_process_inodebits_lock,
155 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res)
157 return ldlm_processing_policy_table[res->lr_type];
160 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg)
166 * REFCOUNTED LOCK OBJECTS
171 * Lock refcounts, during creation:
172 * - one special one for allocation, dec'd only once in destroy
173 * - one for being a lock that's in-use
174 * - one for the addref associated with a new lock
176 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock)
178 cfs_atomic_inc(&lock->l_refc);
182 static void ldlm_lock_free(struct ldlm_lock *lock, size_t size)
184 LASSERT(size == sizeof(*lock));
185 OBD_SLAB_FREE(lock, ldlm_lock_slab, sizeof(*lock));
188 void ldlm_lock_put(struct ldlm_lock *lock)
192 LASSERT(lock->l_resource != LP_POISON);
193 LASSERT(cfs_atomic_read(&lock->l_refc) > 0);
194 if (cfs_atomic_dec_and_test(&lock->l_refc)) {
195 struct ldlm_resource *res;
198 "final lock_put on destroyed lock, freeing it.");
200 res = lock->l_resource;
201 LASSERT(lock->l_destroyed);
202 LASSERT(cfs_list_empty(&lock->l_res_link));
203 LASSERT(cfs_list_empty(&lock->l_pending_chain));
205 lprocfs_counter_decr(ldlm_res_to_ns(res)->ns_stats,
207 lu_ref_del(&res->lr_reference, "lock", lock);
208 ldlm_resource_putref(res);
209 lock->l_resource = NULL;
210 if (lock->l_export) {
211 class_export_lock_put(lock->l_export, lock);
212 lock->l_export = NULL;
215 if (lock->l_lvb_data != NULL)
216 OBD_FREE(lock->l_lvb_data, lock->l_lvb_len);
218 ldlm_interval_free(ldlm_interval_detach(lock));
219 lu_ref_fini(&lock->l_reference);
220 OBD_FREE_RCU_CB(lock, sizeof(*lock), &lock->l_handle,
227 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock)
230 if (!cfs_list_empty(&lock->l_lru)) {
231 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
233 LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
234 cfs_list_del_init(&lock->l_lru);
235 if (lock->l_flags & LDLM_FL_SKIPPED)
236 lock->l_flags &= ~LDLM_FL_SKIPPED;
237 LASSERT(ns->ns_nr_unused > 0);
244 int ldlm_lock_remove_from_lru(struct ldlm_lock *lock)
246 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
250 if (lock->l_ns_srv) {
251 LASSERT(cfs_list_empty(&lock->l_lru));
255 cfs_spin_lock(&ns->ns_lock);
256 rc = ldlm_lock_remove_from_lru_nolock(lock);
257 cfs_spin_unlock(&ns->ns_lock);
262 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock)
264 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
266 lock->l_last_used = cfs_time_current();
267 LASSERT(cfs_list_empty(&lock->l_lru));
268 LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
269 cfs_list_add_tail(&lock->l_lru, &ns->ns_unused_list);
270 LASSERT(ns->ns_nr_unused >= 0);
274 void ldlm_lock_add_to_lru(struct ldlm_lock *lock)
276 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
279 cfs_spin_lock(&ns->ns_lock);
280 ldlm_lock_add_to_lru_nolock(lock);
281 cfs_spin_unlock(&ns->ns_lock);
285 void ldlm_lock_touch_in_lru(struct ldlm_lock *lock)
287 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
290 if (lock->l_ns_srv) {
291 LASSERT(cfs_list_empty(&lock->l_lru));
296 cfs_spin_lock(&ns->ns_lock);
297 if (!cfs_list_empty(&lock->l_lru)) {
298 ldlm_lock_remove_from_lru_nolock(lock);
299 ldlm_lock_add_to_lru_nolock(lock);
301 cfs_spin_unlock(&ns->ns_lock);
305 /* This used to have a 'strict' flag, which recovery would use to mark an
306 * in-use lock as needing-to-die. Lest I am ever tempted to put it back, I
307 * shall explain why it's gone: with the new hash table scheme, once you call
308 * ldlm_lock_destroy, you can never drop your final references on this lock.
309 * Because it's not in the hash table anymore. -phil */
310 int ldlm_lock_destroy_internal(struct ldlm_lock *lock)
314 if (lock->l_readers || lock->l_writers) {
315 LDLM_ERROR(lock, "lock still has references");
316 ldlm_lock_dump(D_ERROR, lock, 0);
320 if (!cfs_list_empty(&lock->l_res_link)) {
321 LDLM_ERROR(lock, "lock still on resource");
322 ldlm_lock_dump(D_ERROR, lock, 0);
326 if (lock->l_destroyed) {
327 LASSERT(cfs_list_empty(&lock->l_lru));
331 lock->l_destroyed = 1;
333 if (lock->l_export && lock->l_export->exp_lock_hash &&
334 !cfs_hlist_unhashed(&lock->l_exp_hash))
335 cfs_hash_del(lock->l_export->exp_lock_hash,
336 &lock->l_remote_handle, &lock->l_exp_hash);
338 ldlm_lock_remove_from_lru(lock);
339 class_handle_unhash(&lock->l_handle);
342 /* Wake anyone waiting for this lock */
343 /* FIXME: I should probably add yet another flag, instead of using
344 * l_export to only call this on clients */
346 class_export_put(lock->l_export);
347 lock->l_export = NULL;
348 if (lock->l_export && lock->l_completion_ast)
349 lock->l_completion_ast(lock, 0);
355 void ldlm_lock_destroy(struct ldlm_lock *lock)
359 lock_res_and_lock(lock);
360 first = ldlm_lock_destroy_internal(lock);
361 unlock_res_and_lock(lock);
363 /* drop reference from hashtable only for first destroy */
365 lu_ref_del(&lock->l_reference, "hash", lock);
366 LDLM_LOCK_RELEASE(lock);
371 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock)
375 first = ldlm_lock_destroy_internal(lock);
376 /* drop reference from hashtable only for first destroy */
378 lu_ref_del(&lock->l_reference, "hash", lock);
379 LDLM_LOCK_RELEASE(lock);
384 /* this is called by portals_handle2object with the handle lock taken */
385 static void lock_handle_addref(void *lock)
387 LDLM_LOCK_GET((struct ldlm_lock *)lock);
391 * usage: pass in a resource on which you have done ldlm_resource_get
392 * new lock will take over the refcount.
393 * returns: lock with refcount 2 - one for current caller and one for remote
395 static struct ldlm_lock *ldlm_lock_new(struct ldlm_resource *resource)
397 struct ldlm_lock *lock;
400 if (resource == NULL)
403 OBD_SLAB_ALLOC_PTR_GFP(lock, ldlm_lock_slab, CFS_ALLOC_IO);
407 cfs_spin_lock_init(&lock->l_lock);
408 lock->l_resource = resource;
409 lu_ref_add(&resource->lr_reference, "lock", lock);
411 cfs_atomic_set(&lock->l_refc, 2);
412 CFS_INIT_LIST_HEAD(&lock->l_res_link);
413 CFS_INIT_LIST_HEAD(&lock->l_lru);
414 CFS_INIT_LIST_HEAD(&lock->l_pending_chain);
415 CFS_INIT_LIST_HEAD(&lock->l_bl_ast);
416 CFS_INIT_LIST_HEAD(&lock->l_cp_ast);
417 CFS_INIT_LIST_HEAD(&lock->l_rk_ast);
418 cfs_waitq_init(&lock->l_waitq);
419 lock->l_blocking_lock = NULL;
420 CFS_INIT_LIST_HEAD(&lock->l_sl_mode);
421 CFS_INIT_LIST_HEAD(&lock->l_sl_policy);
422 CFS_INIT_HLIST_NODE(&lock->l_exp_hash);
424 lprocfs_counter_incr(ldlm_res_to_ns(resource)->ns_stats,
426 CFS_INIT_LIST_HEAD(&lock->l_handle.h_link);
427 class_handle_hash(&lock->l_handle, lock_handle_addref);
429 lu_ref_init(&lock->l_reference);
430 lu_ref_add(&lock->l_reference, "hash", lock);
431 lock->l_callback_timeout = 0;
433 #if LUSTRE_TRACKS_LOCK_EXP_REFS
434 CFS_INIT_LIST_HEAD(&lock->l_exp_refs_link);
435 lock->l_exp_refs_nr = 0;
436 lock->l_exp_refs_target = NULL;
442 int ldlm_lock_change_resource(struct ldlm_namespace *ns, struct ldlm_lock *lock,
443 const struct ldlm_res_id *new_resid)
445 struct ldlm_resource *oldres = lock->l_resource;
446 struct ldlm_resource *newres;
450 LASSERT(ns_is_client(ns));
452 lock_res_and_lock(lock);
453 if (memcmp(new_resid, &lock->l_resource->lr_name,
454 sizeof(lock->l_resource->lr_name)) == 0) {
456 unlock_res_and_lock(lock);
460 LASSERT(new_resid->name[0] != 0);
462 /* This function assumes that the lock isn't on any lists */
463 LASSERT(cfs_list_empty(&lock->l_res_link));
465 type = oldres->lr_type;
466 unlock_res_and_lock(lock);
468 newres = ldlm_resource_get(ns, NULL, new_resid, type, 1);
472 lu_ref_add(&newres->lr_reference, "lock", lock);
474 * To flip the lock from the old to the new resource, lock, oldres and
475 * newres have to be locked. Resource spin-locks are nested within
476 * lock->l_lock, and are taken in the memory address order to avoid
479 cfs_spin_lock(&lock->l_lock);
480 oldres = lock->l_resource;
481 if (oldres < newres) {
483 lock_res_nested(newres, LRT_NEW);
486 lock_res_nested(oldres, LRT_NEW);
488 LASSERT(memcmp(new_resid, &oldres->lr_name,
489 sizeof oldres->lr_name) != 0);
490 lock->l_resource = newres;
492 unlock_res_and_lock(lock);
494 /* ...and the flowers are still standing! */
495 lu_ref_del(&oldres->lr_reference, "lock", lock);
496 ldlm_resource_putref(oldres);
505 void ldlm_lock2handle(const struct ldlm_lock *lock, struct lustre_handle *lockh)
507 lockh->cookie = lock->l_handle.h_cookie;
510 /* if flags: atomically get the lock and set the flags.
511 * Return NULL if flag already set
514 struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *handle,
517 struct ldlm_lock *lock;
522 lock = class_handle2object(handle->cookie);
526 /* It's unlikely but possible that someone marked the lock as
527 * destroyed after we did handle2object on it */
528 if (flags == 0 && !lock->l_destroyed) {
529 lu_ref_add(&lock->l_reference, "handle", cfs_current());
533 lock_res_and_lock(lock);
535 LASSERT(lock->l_resource != NULL);
537 lu_ref_add_atomic(&lock->l_reference, "handle", cfs_current());
538 if (unlikely(lock->l_destroyed)) {
539 unlock_res_and_lock(lock);
540 CDEBUG(D_INFO, "lock already destroyed: lock %p\n", lock);
545 if (flags && (lock->l_flags & flags)) {
546 unlock_res_and_lock(lock);
552 lock->l_flags |= flags;
554 unlock_res_and_lock(lock);
558 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc)
560 struct obd_export *exp = lock->l_export?:lock->l_conn_export;
561 /* INODEBITS_INTEROP: If the other side does not support
562 * inodebits, reply with a plain lock descriptor.
564 if ((lock->l_resource->lr_type == LDLM_IBITS) &&
565 (exp && !(exp->exp_connect_flags & OBD_CONNECT_IBITS))) {
566 /* Make sure all the right bits are set in this lock we
567 are going to pass to client */
568 LASSERTF(lock->l_policy_data.l_inodebits.bits ==
569 (MDS_INODELOCK_LOOKUP|MDS_INODELOCK_UPDATE),
570 "Inappropriate inode lock bits during "
571 "conversion " LPU64 "\n",
572 lock->l_policy_data.l_inodebits.bits);
574 ldlm_res2desc(lock->l_resource, &desc->l_resource);
575 desc->l_resource.lr_type = LDLM_PLAIN;
577 /* Convert "new" lock mode to something old client can
579 if ((lock->l_req_mode == LCK_CR) ||
580 (lock->l_req_mode == LCK_CW))
581 desc->l_req_mode = LCK_PR;
583 desc->l_req_mode = lock->l_req_mode;
584 if ((lock->l_granted_mode == LCK_CR) ||
585 (lock->l_granted_mode == LCK_CW)) {
586 desc->l_granted_mode = LCK_PR;
588 /* We never grant PW/EX locks to clients */
589 LASSERT((lock->l_granted_mode != LCK_PW) &&
590 (lock->l_granted_mode != LCK_EX));
591 desc->l_granted_mode = lock->l_granted_mode;
594 /* We do not copy policy here, because there is no
595 policy for plain locks */
597 ldlm_res2desc(lock->l_resource, &desc->l_resource);
598 desc->l_req_mode = lock->l_req_mode;
599 desc->l_granted_mode = lock->l_granted_mode;
600 ldlm_convert_policy_to_wire(lock->l_resource->lr_type,
601 &lock->l_policy_data,
602 &desc->l_policy_data);
606 void ldlm_add_bl_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
607 cfs_list_t *work_list)
609 if ((lock->l_flags & LDLM_FL_AST_SENT) == 0) {
610 LDLM_DEBUG(lock, "lock incompatible; sending blocking AST.");
611 lock->l_flags |= LDLM_FL_AST_SENT;
612 /* If the enqueuing client said so, tell the AST recipient to
613 * discard dirty data, rather than writing back. */
614 if (new->l_flags & LDLM_AST_DISCARD_DATA)
615 lock->l_flags |= LDLM_FL_DISCARD_DATA;
616 LASSERT(cfs_list_empty(&lock->l_bl_ast));
617 cfs_list_add(&lock->l_bl_ast, work_list);
619 LASSERT(lock->l_blocking_lock == NULL);
620 lock->l_blocking_lock = LDLM_LOCK_GET(new);
624 void ldlm_add_cp_work_item(struct ldlm_lock *lock, cfs_list_t *work_list)
626 if ((lock->l_flags & LDLM_FL_CP_REQD) == 0) {
627 lock->l_flags |= LDLM_FL_CP_REQD;
628 LDLM_DEBUG(lock, "lock granted; sending completion AST.");
629 LASSERT(cfs_list_empty(&lock->l_cp_ast));
630 cfs_list_add(&lock->l_cp_ast, work_list);
635 /* must be called with lr_lock held */
636 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
637 cfs_list_t *work_list)
640 check_res_locked(lock->l_resource);
642 ldlm_add_bl_work_item(lock, new, work_list);
644 ldlm_add_cp_work_item(lock, work_list);
648 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode)
650 struct ldlm_lock *lock;
652 lock = ldlm_handle2lock(lockh);
653 LASSERT(lock != NULL);
654 ldlm_lock_addref_internal(lock, mode);
658 void ldlm_lock_addref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
660 ldlm_lock_remove_from_lru(lock);
661 if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
663 lu_ref_add_atomic(&lock->l_reference, "reader", lock);
665 if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP | LCK_COS)) {
667 lu_ref_add_atomic(&lock->l_reference, "writer", lock);
670 lu_ref_add_atomic(&lock->l_reference, "user", lock);
671 LDLM_DEBUG(lock, "ldlm_lock_addref(%s)", ldlm_lockname[mode]);
675 * Attempts to addref a lock, and fails if lock is already LDLM_FL_CBPENDING
678 * \retval 0 success, lock was addref-ed
680 * \retval -EAGAIN lock is being canceled.
682 int ldlm_lock_addref_try(struct lustre_handle *lockh, __u32 mode)
684 struct ldlm_lock *lock;
688 lock = ldlm_handle2lock(lockh);
690 lock_res_and_lock(lock);
691 if (lock->l_readers != 0 || lock->l_writers != 0 ||
692 !(lock->l_flags & LDLM_FL_CBPENDING)) {
693 ldlm_lock_addref_internal_nolock(lock, mode);
696 unlock_res_and_lock(lock);
702 /* only called for local locks */
703 void ldlm_lock_addref_internal(struct ldlm_lock *lock, __u32 mode)
705 lock_res_and_lock(lock);
706 ldlm_lock_addref_internal_nolock(lock, mode);
707 unlock_res_and_lock(lock);
710 /* only called in ldlm_flock_destroy and for local locks.
711 * * for LDLM_FLOCK type locks, l_blocking_ast is null, and
712 * * ldlm_lock_remove_from_lru() does nothing, it is safe
713 * * for ldlm_flock_destroy usage by dropping some code */
714 void ldlm_lock_decref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
716 LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
717 if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
718 LASSERT(lock->l_readers > 0);
719 lu_ref_del(&lock->l_reference, "reader", lock);
722 if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP | LCK_COS)) {
723 LASSERT(lock->l_writers > 0);
724 lu_ref_del(&lock->l_reference, "writer", lock);
728 lu_ref_del(&lock->l_reference, "user", lock);
729 LDLM_LOCK_RELEASE(lock); /* matches the LDLM_LOCK_GET() in addref */
732 void ldlm_lock_decref_internal(struct ldlm_lock *lock, __u32 mode)
734 struct ldlm_namespace *ns;
737 lock_res_and_lock(lock);
739 ns = ldlm_lock_to_ns(lock);
741 ldlm_lock_decref_internal_nolock(lock, mode);
743 if (lock->l_flags & LDLM_FL_LOCAL &&
744 !lock->l_readers && !lock->l_writers) {
745 /* If this is a local lock on a server namespace and this was
746 * the last reference, cancel the lock. */
747 CDEBUG(D_INFO, "forcing cancel of local lock\n");
748 lock->l_flags |= LDLM_FL_CBPENDING;
751 if (!lock->l_readers && !lock->l_writers &&
752 (lock->l_flags & LDLM_FL_CBPENDING)) {
753 /* If we received a blocked AST and this was the last reference,
754 * run the callback. */
755 if (lock->l_ns_srv && lock->l_export)
756 CERROR("FL_CBPENDING set on non-local lock--just a "
759 LDLM_DEBUG(lock, "final decref done on cbpending lock");
761 LDLM_LOCK_GET(lock); /* dropped by bl thread */
762 ldlm_lock_remove_from_lru(lock);
763 unlock_res_and_lock(lock);
765 if (lock->l_flags & LDLM_FL_FAIL_LOC)
766 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
768 if ((lock->l_flags & LDLM_FL_ATOMIC_CB) ||
769 ldlm_bl_to_thread_lock(ns, NULL, lock) != 0)
770 ldlm_handle_bl_callback(ns, NULL, lock);
771 } else if (ns_is_client(ns) &&
772 !lock->l_readers && !lock->l_writers &&
773 !(lock->l_flags & LDLM_FL_NO_LRU) &&
774 !(lock->l_flags & LDLM_FL_BL_AST)) {
776 LDLM_DEBUG(lock, "add lock into lru list");
778 /* If this is a client-side namespace and this was the last
779 * reference, put it on the LRU. */
780 ldlm_lock_add_to_lru(lock);
781 unlock_res_and_lock(lock);
783 if (lock->l_flags & LDLM_FL_FAIL_LOC)
784 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
786 /* Call ldlm_cancel_lru() only if EARLY_CANCEL and LRU RESIZE
787 * are not supported by the server, otherwise, it is done on
789 if (!exp_connect_cancelset(lock->l_conn_export) &&
790 !ns_connect_lru_resize(ns))
791 ldlm_cancel_lru(ns, 0, LDLM_ASYNC, 0);
793 LDLM_DEBUG(lock, "do not add lock into lru list");
794 unlock_res_and_lock(lock);
800 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode)
802 struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
803 LASSERTF(lock != NULL, "Non-existing lock: "LPX64"\n", lockh->cookie);
804 ldlm_lock_decref_internal(lock, mode);
808 /* This will drop a lock reference and mark it for destruction, but will not
809 * necessarily cancel the lock before returning. */
810 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode)
812 struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
815 LASSERT(lock != NULL);
817 LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
818 lock_res_and_lock(lock);
819 lock->l_flags |= LDLM_FL_CBPENDING;
820 unlock_res_and_lock(lock);
821 ldlm_lock_decref_internal(lock, mode);
825 struct sl_insert_point {
826 cfs_list_t *res_link;
827 cfs_list_t *mode_link;
828 cfs_list_t *policy_link;
832 * search_granted_lock
835 * Finds a position to insert the new lock.
837 * queue [input]: the granted list where search acts on;
838 * req [input]: the lock whose position to be located;
839 * prev [output]: positions within 3 lists to insert @req to
843 * - ldlm_grant_lock_with_skiplist
845 static void search_granted_lock(cfs_list_t *queue,
846 struct ldlm_lock *req,
847 struct sl_insert_point *prev)
850 struct ldlm_lock *lock, *mode_end, *policy_end;
853 cfs_list_for_each(tmp, queue) {
854 lock = cfs_list_entry(tmp, struct ldlm_lock, l_res_link);
856 mode_end = cfs_list_entry(lock->l_sl_mode.prev,
857 struct ldlm_lock, l_sl_mode);
859 if (lock->l_req_mode != req->l_req_mode) {
860 /* jump to last lock of mode group */
861 tmp = &mode_end->l_res_link;
865 /* suitable mode group is found */
866 if (lock->l_resource->lr_type == LDLM_PLAIN) {
867 /* insert point is last lock of the mode group */
868 prev->res_link = &mode_end->l_res_link;
869 prev->mode_link = &mode_end->l_sl_mode;
870 prev->policy_link = &req->l_sl_policy;
873 } else if (lock->l_resource->lr_type == LDLM_IBITS) {
876 cfs_list_entry(lock->l_sl_policy.prev,
880 if (lock->l_policy_data.l_inodebits.bits ==
881 req->l_policy_data.l_inodebits.bits) {
882 /* insert point is last lock of
883 * the policy group */
885 &policy_end->l_res_link;
887 &policy_end->l_sl_mode;
889 &policy_end->l_sl_policy;
894 if (policy_end == mode_end)
895 /* done with mode group */
898 /* go to next policy group within mode group */
899 tmp = policy_end->l_res_link.next;
900 lock = cfs_list_entry(tmp, struct ldlm_lock,
902 } /* loop over policy groups within the mode group */
904 /* insert point is last lock of the mode group,
905 * new policy group is started */
906 prev->res_link = &mode_end->l_res_link;
907 prev->mode_link = &mode_end->l_sl_mode;
908 prev->policy_link = &req->l_sl_policy;
912 LDLM_ERROR(lock,"is not LDLM_PLAIN or LDLM_IBITS lock");
917 /* insert point is last lock on the queue,
918 * new mode group and new policy group are started */
919 prev->res_link = queue->prev;
920 prev->mode_link = &req->l_sl_mode;
921 prev->policy_link = &req->l_sl_policy;
926 static void ldlm_granted_list_add_lock(struct ldlm_lock *lock,
927 struct sl_insert_point *prev)
929 struct ldlm_resource *res = lock->l_resource;
932 check_res_locked(res);
934 ldlm_resource_dump(D_INFO, res);
935 CDEBUG(D_OTHER, "About to add this lock:\n");
936 ldlm_lock_dump(D_OTHER, lock, 0);
938 if (lock->l_destroyed) {
939 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
943 LASSERT(cfs_list_empty(&lock->l_res_link));
944 LASSERT(cfs_list_empty(&lock->l_sl_mode));
945 LASSERT(cfs_list_empty(&lock->l_sl_policy));
947 cfs_list_add(&lock->l_res_link, prev->res_link);
948 cfs_list_add(&lock->l_sl_mode, prev->mode_link);
949 cfs_list_add(&lock->l_sl_policy, prev->policy_link);
954 static void ldlm_grant_lock_with_skiplist(struct ldlm_lock *lock)
956 struct sl_insert_point prev;
959 LASSERT(lock->l_req_mode == lock->l_granted_mode);
961 search_granted_lock(&lock->l_resource->lr_granted, lock, &prev);
962 ldlm_granted_list_add_lock(lock, &prev);
967 * - ldlm_lock_enqueue
968 * - ldlm_reprocess_queue
969 * - ldlm_lock_convert
971 * must be called with lr_lock held
973 void ldlm_grant_lock(struct ldlm_lock *lock, cfs_list_t *work_list)
975 struct ldlm_resource *res = lock->l_resource;
978 check_res_locked(res);
980 lock->l_granted_mode = lock->l_req_mode;
981 if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS)
982 ldlm_grant_lock_with_skiplist(lock);
983 else if (res->lr_type == LDLM_EXTENT)
984 ldlm_extent_add_lock(res, lock);
986 ldlm_resource_add_lock(res, &res->lr_granted, lock);
988 if (lock->l_granted_mode < res->lr_most_restr)
989 res->lr_most_restr = lock->l_granted_mode;
991 if (work_list && lock->l_completion_ast != NULL)
992 ldlm_add_ast_work_item(lock, NULL, work_list);
994 ldlm_pool_add(&ldlm_res_to_ns(res)->ns_pool, lock);
998 /* returns a referenced lock or NULL. See the flag descriptions below, in the
999 * comment above ldlm_lock_match */
1000 static struct ldlm_lock *search_queue(cfs_list_t *queue,
1002 ldlm_policy_data_t *policy,
1003 struct ldlm_lock *old_lock,
1004 int flags, int unref)
1006 struct ldlm_lock *lock;
1009 cfs_list_for_each(tmp, queue) {
1012 lock = cfs_list_entry(tmp, struct ldlm_lock, l_res_link);
1014 if (lock == old_lock)
1017 /* llite sometimes wants to match locks that will be
1018 * canceled when their users drop, but we allow it to match
1019 * if it passes in CBPENDING and the lock still has users.
1020 * this is generally only going to be used by children
1021 * whose parents already hold a lock so forward progress
1022 * can still happen. */
1023 if (lock->l_flags & LDLM_FL_CBPENDING &&
1024 !(flags & LDLM_FL_CBPENDING))
1026 if (!unref && lock->l_flags & LDLM_FL_CBPENDING &&
1027 lock->l_readers == 0 && lock->l_writers == 0)
1030 if (!(lock->l_req_mode & *mode))
1032 match = lock->l_req_mode;
1034 if (lock->l_resource->lr_type == LDLM_EXTENT &&
1035 (lock->l_policy_data.l_extent.start >
1036 policy->l_extent.start ||
1037 lock->l_policy_data.l_extent.end < policy->l_extent.end))
1040 if (unlikely(match == LCK_GROUP) &&
1041 lock->l_resource->lr_type == LDLM_EXTENT &&
1042 lock->l_policy_data.l_extent.gid != policy->l_extent.gid)
1045 /* We match if we have existing lock with same or wider set
1047 if (lock->l_resource->lr_type == LDLM_IBITS &&
1048 ((lock->l_policy_data.l_inodebits.bits &
1049 policy->l_inodebits.bits) !=
1050 policy->l_inodebits.bits))
1054 (lock->l_destroyed || (lock->l_flags & LDLM_FL_FAILED)))
1057 if ((flags & LDLM_FL_LOCAL_ONLY) &&
1058 !(lock->l_flags & LDLM_FL_LOCAL))
1061 if (flags & LDLM_FL_TEST_LOCK) {
1062 LDLM_LOCK_GET(lock);
1063 ldlm_lock_touch_in_lru(lock);
1065 ldlm_lock_addref_internal_nolock(lock, match);
1074 void ldlm_lock_allow_match_locked(struct ldlm_lock *lock)
1076 lock->l_flags |= LDLM_FL_LVB_READY;
1077 cfs_waitq_signal(&lock->l_waitq);
1080 void ldlm_lock_allow_match(struct ldlm_lock *lock)
1082 lock_res_and_lock(lock);
1083 ldlm_lock_allow_match_locked(lock);
1084 unlock_res_and_lock(lock);
1087 /* Can be called in two ways:
1089 * If 'ns' is NULL, then lockh describes an existing lock that we want to look
1090 * for a duplicate of.
1092 * Otherwise, all of the fields must be filled in, to match against.
1094 * If 'flags' contains LDLM_FL_LOCAL_ONLY, then only match local locks on the
1095 * server (ie, connh is NULL)
1096 * If 'flags' contains LDLM_FL_BLOCK_GRANTED, then only locks on the granted
1097 * list will be considered
1098 * If 'flags' contains LDLM_FL_CBPENDING, then locks that have been marked
1099 * to be canceled can still be matched as long as they still have reader
1100 * or writer refernces
1101 * If 'flags' contains LDLM_FL_TEST_LOCK, then don't actually reference a lock,
1102 * just tell us if we would have matched.
1104 * Returns 1 if it finds an already-existing lock that is compatible; in this
1105 * case, lockh is filled in with a addref()ed lock
1107 * we also check security context, if that failed we simply return 0 (to keep
1108 * caller code unchanged), the context failure will be discovered by caller
1111 ldlm_mode_t ldlm_lock_match(struct ldlm_namespace *ns, int flags,
1112 const struct ldlm_res_id *res_id, ldlm_type_t type,
1113 ldlm_policy_data_t *policy, ldlm_mode_t mode,
1114 struct lustre_handle *lockh, int unref)
1116 struct ldlm_resource *res;
1117 struct ldlm_lock *lock, *old_lock = NULL;
1122 old_lock = ldlm_handle2lock(lockh);
1125 ns = ldlm_lock_to_ns(old_lock);
1126 res_id = &old_lock->l_resource->lr_name;
1127 type = old_lock->l_resource->lr_type;
1128 mode = old_lock->l_req_mode;
1131 res = ldlm_resource_get(ns, NULL, res_id, type, 0);
1133 LASSERT(old_lock == NULL);
1137 LDLM_RESOURCE_ADDREF(res);
1140 lock = search_queue(&res->lr_granted, &mode, policy, old_lock,
1144 if (flags & LDLM_FL_BLOCK_GRANTED)
1146 lock = search_queue(&res->lr_converting, &mode, policy, old_lock,
1150 lock = search_queue(&res->lr_waiting, &mode, policy, old_lock,
1158 LDLM_RESOURCE_DELREF(res);
1159 ldlm_resource_putref(res);
1162 ldlm_lock2handle(lock, lockh);
1163 if ((flags & LDLM_FL_LVB_READY) &&
1164 (!(lock->l_flags & LDLM_FL_LVB_READY))) {
1165 struct l_wait_info lwi;
1166 if (lock->l_completion_ast) {
1167 int err = lock->l_completion_ast(lock,
1168 LDLM_FL_WAIT_NOREPROC,
1171 if (flags & LDLM_FL_TEST_LOCK)
1172 LDLM_LOCK_RELEASE(lock);
1174 ldlm_lock_decref_internal(lock,
1181 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout),
1182 NULL, LWI_ON_SIGNAL_NOOP, NULL);
1184 /* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
1185 l_wait_event(lock->l_waitq,
1186 (lock->l_flags & LDLM_FL_LVB_READY), &lwi);
1191 LDLM_DEBUG(lock, "matched ("LPU64" "LPU64")",
1192 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1193 res_id->name[2] : policy->l_extent.start,
1194 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1195 res_id->name[3] : policy->l_extent.end);
1197 /* check user's security context */
1198 if (lock->l_conn_export &&
1199 sptlrpc_import_check_ctx(
1200 class_exp2cliimp(lock->l_conn_export))) {
1201 if (!(flags & LDLM_FL_TEST_LOCK))
1202 ldlm_lock_decref_internal(lock, mode);
1206 if (flags & LDLM_FL_TEST_LOCK)
1207 LDLM_LOCK_RELEASE(lock);
1209 } else if (!(flags & LDLM_FL_TEST_LOCK)) {/*less verbose for test-only*/
1210 LDLM_DEBUG_NOLOCK("not matched ns %p type %u mode %u res "
1211 LPU64"/"LPU64" ("LPU64" "LPU64")", ns,
1212 type, mode, res_id->name[0], res_id->name[1],
1213 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1214 res_id->name[2] :policy->l_extent.start,
1215 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1216 res_id->name[3] : policy->l_extent.end);
1219 LDLM_LOCK_PUT(old_lock);
1221 return rc ? mode : 0;
1224 ldlm_mode_t ldlm_revalidate_lock_handle(struct lustre_handle *lockh,
1227 struct ldlm_lock *lock;
1228 ldlm_mode_t mode = 0;
1231 lock = ldlm_handle2lock(lockh);
1233 lock_res_and_lock(lock);
1234 if (lock->l_destroyed || lock->l_flags & LDLM_FL_FAILED)
1237 if (lock->l_flags & LDLM_FL_CBPENDING &&
1238 lock->l_readers == 0 && lock->l_writers == 0)
1242 *bits = lock->l_policy_data.l_inodebits.bits;
1243 mode = lock->l_granted_mode;
1244 ldlm_lock_addref_internal_nolock(lock, mode);
1251 unlock_res_and_lock(lock);
1252 LDLM_LOCK_PUT(lock);
1256 EXPORT_SYMBOL(ldlm_revalidate_lock_handle);
1258 /* Returns a referenced lock */
1259 struct ldlm_lock *ldlm_lock_create(struct ldlm_namespace *ns,
1260 const struct ldlm_res_id *res_id,
1263 const struct ldlm_callback_suite *cbs,
1264 void *data, __u32 lvb_len)
1266 struct ldlm_lock *lock;
1267 struct ldlm_resource *res;
1270 res = ldlm_resource_get(ns, NULL, res_id, type, 1);
1274 lock = ldlm_lock_new(res);
1279 lock->l_req_mode = mode;
1280 lock->l_ast_data = data;
1281 lock->l_pid = cfs_curproc_pid();
1282 lock->l_ns_srv = ns_is_server(ns);
1284 lock->l_blocking_ast = cbs->lcs_blocking;
1285 lock->l_completion_ast = cbs->lcs_completion;
1286 lock->l_glimpse_ast = cbs->lcs_glimpse;
1287 lock->l_weigh_ast = cbs->lcs_weigh;
1290 lock->l_tree_node = NULL;
1291 /* if this is the extent lock, allocate the interval tree node */
1292 if (type == LDLM_EXTENT) {
1293 if (ldlm_interval_alloc(lock) == NULL)
1298 lock->l_lvb_len = lvb_len;
1299 OBD_ALLOC(lock->l_lvb_data, lvb_len);
1300 if (lock->l_lvb_data == NULL)
1304 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_NEW_LOCK))
1310 ldlm_lock_destroy(lock);
1311 LDLM_LOCK_RELEASE(lock);
1315 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *ns,
1316 struct ldlm_lock **lockp,
1317 void *cookie, int *flags)
1319 struct ldlm_lock *lock = *lockp;
1320 struct ldlm_resource *res = lock->l_resource;
1321 int local = ns_is_client(ldlm_res_to_ns(res));
1322 ldlm_processing_policy policy;
1323 ldlm_error_t rc = ELDLM_OK;
1324 struct ldlm_interval *node = NULL;
1327 lock->l_last_activity = cfs_time_current_sec();
1328 /* policies are not executed on the client or during replay */
1329 if ((*flags & (LDLM_FL_HAS_INTENT|LDLM_FL_REPLAY)) == LDLM_FL_HAS_INTENT
1330 && !local && ns->ns_policy) {
1331 rc = ns->ns_policy(ns, lockp, cookie, lock->l_req_mode, *flags,
1333 if (rc == ELDLM_LOCK_REPLACED) {
1334 /* The lock that was returned has already been granted,
1335 * and placed into lockp. If it's not the same as the
1336 * one we passed in, then destroy the old one and our
1337 * work here is done. */
1338 if (lock != *lockp) {
1339 ldlm_lock_destroy(lock);
1340 LDLM_LOCK_RELEASE(lock);
1342 *flags |= LDLM_FL_LOCK_CHANGED;
1344 } else if (rc != ELDLM_OK ||
1345 (rc == ELDLM_OK && (*flags & LDLM_FL_INTENT_ONLY))) {
1346 ldlm_lock_destroy(lock);
1351 /* For a replaying lock, it might be already in granted list. So
1352 * unlinking the lock will cause the interval node to be freed, we
1353 * have to allocate the interval node early otherwise we can't regrant
1354 * this lock in the future. - jay */
1355 if (!local && (*flags & LDLM_FL_REPLAY) && res->lr_type == LDLM_EXTENT)
1356 OBD_SLAB_ALLOC_PTR_GFP(node, ldlm_interval_slab, CFS_ALLOC_IO);
1358 lock_res_and_lock(lock);
1359 if (local && lock->l_req_mode == lock->l_granted_mode) {
1360 /* The server returned a blocked lock, but it was granted
1361 * before we got a chance to actually enqueue it. We don't
1362 * need to do anything else. */
1363 *flags &= ~(LDLM_FL_BLOCK_GRANTED |
1364 LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_WAIT);
1365 GOTO(out, ELDLM_OK);
1368 ldlm_resource_unlink_lock(lock);
1369 if (res->lr_type == LDLM_EXTENT && lock->l_tree_node == NULL) {
1371 ldlm_lock_destroy_nolock(lock);
1372 GOTO(out, rc = -ENOMEM);
1375 CFS_INIT_LIST_HEAD(&node->li_group);
1376 ldlm_interval_attach(node, lock);
1380 /* Some flags from the enqueue want to make it into the AST, via the
1381 * lock's l_flags. */
1382 lock->l_flags |= *flags & LDLM_AST_DISCARD_DATA;
1384 /* This distinction between local lock trees is very important; a client
1385 * namespace only has information about locks taken by that client, and
1386 * thus doesn't have enough information to decide for itself if it can
1387 * be granted (below). In this case, we do exactly what the server
1388 * tells us to do, as dictated by the 'flags'.
1390 * We do exactly the same thing during recovery, when the server is
1391 * more or less trusting the clients not to lie.
1393 * FIXME (bug 268): Detect obvious lies by checking compatibility in
1394 * granted/converting queues. */
1396 if (*flags & LDLM_FL_BLOCK_CONV)
1397 ldlm_resource_add_lock(res, &res->lr_converting, lock);
1398 else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
1399 ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1401 ldlm_grant_lock(lock, NULL);
1402 GOTO(out, ELDLM_OK);
1403 } else if (*flags & LDLM_FL_REPLAY) {
1404 if (*flags & LDLM_FL_BLOCK_CONV) {
1405 ldlm_resource_add_lock(res, &res->lr_converting, lock);
1406 GOTO(out, ELDLM_OK);
1407 } else if (*flags & LDLM_FL_BLOCK_WAIT) {
1408 ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1409 GOTO(out, ELDLM_OK);
1410 } else if (*flags & LDLM_FL_BLOCK_GRANTED) {
1411 ldlm_grant_lock(lock, NULL);
1412 GOTO(out, ELDLM_OK);
1414 /* If no flags, fall through to normal enqueue path. */
1417 policy = ldlm_processing_policy_table[res->lr_type];
1418 policy(lock, flags, 1, &rc, NULL);
1421 unlock_res_and_lock(lock);
1423 OBD_SLAB_FREE(node, ldlm_interval_slab, sizeof(*node));
1427 /* Must be called with namespace taken: queue is waiting or converting. */
1428 int ldlm_reprocess_queue(struct ldlm_resource *res, cfs_list_t *queue,
1429 cfs_list_t *work_list)
1431 cfs_list_t *tmp, *pos;
1432 ldlm_processing_policy policy;
1434 int rc = LDLM_ITER_CONTINUE;
1438 check_res_locked(res);
1440 policy = ldlm_processing_policy_table[res->lr_type];
1443 cfs_list_for_each_safe(tmp, pos, queue) {
1444 struct ldlm_lock *pending;
1445 pending = cfs_list_entry(tmp, struct ldlm_lock, l_res_link);
1447 CDEBUG(D_INFO, "Reprocessing lock %p\n", pending);
1450 rc = policy(pending, &flags, 0, &err, work_list);
1451 if (rc != LDLM_ITER_CONTINUE)
1458 /* Helper function for ldlm_run_ast_work().
1460 * Send an existing rpc set specified by @arg->set and then
1461 * destroy it. Create new one if @do_create flag is set. */
1462 static int ldlm_deliver_cb_set(struct ldlm_cb_set_arg *arg, int do_create)
1468 ptlrpc_set_wait(arg->set);
1469 if (arg->type == LDLM_BL_CALLBACK)
1470 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_GLIMPSE, 2);
1471 ptlrpc_set_destroy(arg->set);
1477 arg->set = ptlrpc_prep_set();
1478 if (arg->set == NULL)
1486 ldlm_work_bl_ast_lock(cfs_list_t *tmp, struct ldlm_cb_set_arg *arg)
1488 struct ldlm_lock_desc d;
1489 struct ldlm_lock *lock = cfs_list_entry(tmp, struct ldlm_lock,
1494 /* nobody should touch l_bl_ast */
1495 lock_res_and_lock(lock);
1496 cfs_list_del_init(&lock->l_bl_ast);
1498 LASSERT(lock->l_flags & LDLM_FL_AST_SENT);
1499 LASSERT(lock->l_bl_ast_run == 0);
1500 LASSERT(lock->l_blocking_lock);
1501 lock->l_bl_ast_run++;
1502 unlock_res_and_lock(lock);
1504 ldlm_lock2desc(lock->l_blocking_lock, &d);
1506 rc = lock->l_blocking_ast(lock, &d, (void *)arg,
1508 LDLM_LOCK_RELEASE(lock->l_blocking_lock);
1509 lock->l_blocking_lock = NULL;
1510 LDLM_LOCK_RELEASE(lock);
1516 ldlm_work_cp_ast_lock(cfs_list_t *tmp, struct ldlm_cb_set_arg *arg)
1518 struct ldlm_lock *lock = cfs_list_entry(tmp, struct ldlm_lock, l_cp_ast);
1519 ldlm_completion_callback completion_callback;
1523 /* It's possible to receive a completion AST before we've set
1524 * the l_completion_ast pointer: either because the AST arrived
1525 * before the reply, or simply because there's a small race
1526 * window between receiving the reply and finishing the local
1527 * enqueue. (bug 842)
1529 * This can't happen with the blocking_ast, however, because we
1530 * will never call the local blocking_ast until we drop our
1531 * reader/writer reference, which we won't do until we get the
1532 * reply and finish enqueueing. */
1534 /* nobody should touch l_cp_ast */
1535 lock_res_and_lock(lock);
1536 cfs_list_del_init(&lock->l_cp_ast);
1537 LASSERT(lock->l_flags & LDLM_FL_CP_REQD);
1538 /* save l_completion_ast since it can be changed by
1539 * mds_intent_policy(), see bug 14225 */
1540 completion_callback = lock->l_completion_ast;
1541 lock->l_flags &= ~LDLM_FL_CP_REQD;
1542 unlock_res_and_lock(lock);
1544 if (completion_callback != NULL)
1545 rc = completion_callback(lock, 0, (void *)arg);
1546 LDLM_LOCK_RELEASE(lock);
1552 ldlm_work_revoke_ast_lock(cfs_list_t *tmp, struct ldlm_cb_set_arg *arg)
1554 struct ldlm_lock_desc desc;
1555 struct ldlm_lock *lock = cfs_list_entry(tmp, struct ldlm_lock,
1560 cfs_list_del_init(&lock->l_rk_ast);
1562 /* the desc just pretend to exclusive */
1563 ldlm_lock2desc(lock, &desc);
1564 desc.l_req_mode = LCK_EX;
1565 desc.l_granted_mode = 0;
1567 rc = lock->l_blocking_ast(lock, &desc, (void*)arg, LDLM_CB_BLOCKING);
1568 LDLM_LOCK_RELEASE(lock);
1573 int ldlm_run_ast_work(struct ldlm_namespace *ns, cfs_list_t *rpc_list,
1574 ldlm_desc_ast_t ast_type)
1576 struct ldlm_cb_set_arg arg = { 0 };
1577 cfs_list_t *tmp, *pos;
1578 int (*work_ast_lock)(cfs_list_t *tmp, struct ldlm_cb_set_arg *arg);
1579 unsigned int max_ast_count;
1583 if (cfs_list_empty(rpc_list))
1586 rc = ldlm_deliver_cb_set(&arg, 1);
1591 case LDLM_WORK_BL_AST:
1592 arg.type = LDLM_BL_CALLBACK;
1593 work_ast_lock = ldlm_work_bl_ast_lock;
1595 case LDLM_WORK_CP_AST:
1596 arg.type = LDLM_CP_CALLBACK;
1597 work_ast_lock = ldlm_work_cp_ast_lock;
1599 case LDLM_WORK_REVOKE_AST:
1600 arg.type = LDLM_BL_CALLBACK;
1601 work_ast_lock = ldlm_work_revoke_ast_lock;
1607 max_ast_count = ns->ns_max_parallel_ast ? : UINT_MAX;
1609 cfs_list_for_each_safe(tmp, pos, rpc_list) {
1610 (void)work_ast_lock(tmp, &arg);
1611 if (arg.rpcs > max_ast_count) {
1612 rc = ldlm_deliver_cb_set(&arg, 1);
1618 (void)ldlm_deliver_cb_set(&arg, 0);
1620 if (rc == 0 && cfs_atomic_read(&arg.restart))
1626 static int reprocess_one_queue(struct ldlm_resource *res, void *closure)
1628 ldlm_reprocess_all(res);
1629 return LDLM_ITER_CONTINUE;
1632 static int ldlm_reprocess_res(cfs_hash_t *hs, cfs_hash_bd_t *bd,
1633 cfs_hlist_node_t *hnode, void *arg)
1635 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1638 rc = reprocess_one_queue(res, arg);
1640 return rc == LDLM_ITER_STOP;
1643 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns)
1648 cfs_hash_for_each_nolock(ns->ns_rs_hash,
1649 ldlm_reprocess_res, NULL);
1654 void ldlm_reprocess_all(struct ldlm_resource *res)
1656 CFS_LIST_HEAD(rpc_list);
1660 /* Local lock trees don't get reprocessed. */
1661 if (ns_is_client(ldlm_res_to_ns(res))) {
1668 rc = ldlm_reprocess_queue(res, &res->lr_converting, &rpc_list);
1669 if (rc == LDLM_ITER_CONTINUE)
1670 ldlm_reprocess_queue(res, &res->lr_waiting, &rpc_list);
1673 rc = ldlm_run_ast_work(ldlm_res_to_ns(res), &rpc_list,
1675 if (rc == -ERESTART) {
1676 LASSERT(cfs_list_empty(&rpc_list));
1682 void ldlm_cancel_callback(struct ldlm_lock *lock)
1684 check_res_locked(lock->l_resource);
1685 if (!(lock->l_flags & LDLM_FL_CANCEL)) {
1686 lock->l_flags |= LDLM_FL_CANCEL;
1687 if (lock->l_blocking_ast) {
1688 // l_check_no_ns_lock(ns);
1689 unlock_res_and_lock(lock);
1690 lock->l_blocking_ast(lock, NULL, lock->l_ast_data,
1692 lock_res_and_lock(lock);
1694 LDLM_DEBUG(lock, "no blocking ast");
1697 lock->l_flags |= LDLM_FL_BL_DONE;
1700 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req)
1702 if (req->l_resource->lr_type != LDLM_PLAIN &&
1703 req->l_resource->lr_type != LDLM_IBITS)
1706 cfs_list_del_init(&req->l_sl_policy);
1707 cfs_list_del_init(&req->l_sl_mode);
1710 void ldlm_lock_cancel(struct ldlm_lock *lock)
1712 struct ldlm_resource *res;
1713 struct ldlm_namespace *ns;
1716 lock_res_and_lock(lock);
1718 res = lock->l_resource;
1719 ns = ldlm_res_to_ns(res);
1721 /* Please do not, no matter how tempting, remove this LBUG without
1722 * talking to me first. -phik */
1723 if (lock->l_readers || lock->l_writers) {
1724 LDLM_ERROR(lock, "lock still has references");
1728 ldlm_del_waiting_lock(lock);
1730 /* Releases cancel callback. */
1731 ldlm_cancel_callback(lock);
1733 /* Yes, second time, just in case it was added again while we were
1734 running with no res lock in ldlm_cancel_callback */
1735 ldlm_del_waiting_lock(lock);
1736 ldlm_resource_unlink_lock(lock);
1737 ldlm_lock_destroy_nolock(lock);
1739 if (lock->l_granted_mode == lock->l_req_mode)
1740 ldlm_pool_del(&ns->ns_pool, lock);
1742 /* Make sure we will not be called again for same lock what is possible
1743 * if not to zero out lock->l_granted_mode */
1744 lock->l_granted_mode = LCK_MINMODE;
1745 unlock_res_and_lock(lock);
1750 int ldlm_lock_set_data(struct lustre_handle *lockh, void *data)
1752 struct ldlm_lock *lock = ldlm_handle2lock(lockh);
1757 if (lock->l_ast_data == NULL)
1758 lock->l_ast_data = data;
1759 if (lock->l_ast_data == data)
1761 LDLM_LOCK_PUT(lock);
1765 EXPORT_SYMBOL(ldlm_lock_set_data);
1767 int ldlm_cancel_locks_for_export_cb(cfs_hash_t *hs, cfs_hash_bd_t *bd,
1768 cfs_hlist_node_t *hnode, void *data)
1771 struct obd_export *exp = data;
1772 struct ldlm_lock *lock = cfs_hash_object(hs, hnode);
1773 struct ldlm_resource *res;
1775 res = ldlm_resource_getref(lock->l_resource);
1776 LDLM_LOCK_GET(lock);
1778 LDLM_DEBUG(lock, "export %p", exp);
1779 ldlm_res_lvbo_update(res, NULL, 1);
1780 ldlm_lock_cancel(lock);
1781 ldlm_reprocess_all(res);
1782 ldlm_resource_putref(res);
1783 LDLM_LOCK_RELEASE(lock);
1787 void ldlm_cancel_locks_for_export(struct obd_export *exp)
1789 cfs_hash_for_each_empty(exp->exp_lock_hash,
1790 ldlm_cancel_locks_for_export_cb, exp);
1794 * Downgrade an exclusive lock.
1796 * A fast variant of ldlm_lock_convert for convertion of exclusive
1797 * locks. The convertion is always successful.
1799 * \param lock A lock to convert
1800 * \param new_mode new lock mode
1802 void ldlm_lock_downgrade(struct ldlm_lock *lock, int new_mode)
1806 LASSERT(lock->l_granted_mode & (LCK_PW | LCK_EX));
1807 LASSERT(new_mode == LCK_COS);
1809 lock_res_and_lock(lock);
1810 ldlm_resource_unlink_lock(lock);
1812 * Remove the lock from pool as it will be added again in
1813 * ldlm_grant_lock() called below.
1815 ldlm_pool_del(&ldlm_lock_to_ns(lock)->ns_pool, lock);
1817 lock->l_req_mode = new_mode;
1818 ldlm_grant_lock(lock, NULL);
1819 unlock_res_and_lock(lock);
1820 ldlm_reprocess_all(lock->l_resource);
1825 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
1828 CFS_LIST_HEAD(rpc_list);
1829 struct ldlm_resource *res;
1830 struct ldlm_namespace *ns;
1833 struct sl_insert_point prev;
1835 struct ldlm_interval *node;
1838 if (new_mode == lock->l_granted_mode) { // No changes? Just return.
1839 *flags |= LDLM_FL_BLOCK_GRANTED;
1840 RETURN(lock->l_resource);
1843 /* I can't check the type of lock here because the bitlock of lock
1844 * is not held here, so do the allocation blindly. -jay */
1845 OBD_SLAB_ALLOC_PTR_GFP(node, ldlm_interval_slab, CFS_ALLOC_IO);
1846 if (node == NULL) /* Actually, this causes EDEADLOCK to be returned */
1849 LASSERTF((new_mode == LCK_PW && lock->l_granted_mode == LCK_PR),
1850 "new_mode %u, granted %u\n", new_mode, lock->l_granted_mode);
1852 lock_res_and_lock(lock);
1854 res = lock->l_resource;
1855 ns = ldlm_res_to_ns(res);
1857 old_mode = lock->l_req_mode;
1858 lock->l_req_mode = new_mode;
1859 if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS) {
1860 /* remember the lock position where the lock might be
1861 * added back to the granted list later and also
1862 * remember the join mode for skiplist fixing. */
1863 prev.res_link = lock->l_res_link.prev;
1864 prev.mode_link = lock->l_sl_mode.prev;
1865 prev.policy_link = lock->l_sl_policy.prev;
1866 ldlm_resource_unlink_lock(lock);
1868 ldlm_resource_unlink_lock(lock);
1869 if (res->lr_type == LDLM_EXTENT) {
1870 /* FIXME: ugly code, I have to attach the lock to a
1871 * interval node again since perhaps it will be granted
1873 CFS_INIT_LIST_HEAD(&node->li_group);
1874 ldlm_interval_attach(node, lock);
1880 * Remove old lock from the pool before adding the lock with new
1881 * mode below in ->policy()
1883 ldlm_pool_del(&ns->ns_pool, lock);
1885 /* If this is a local resource, put it on the appropriate list. */
1886 if (ns_is_client(ldlm_res_to_ns(res))) {
1887 if (*flags & (LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_GRANTED)) {
1888 ldlm_resource_add_lock(res, &res->lr_converting, lock);
1890 /* This should never happen, because of the way the
1891 * server handles conversions. */
1892 LDLM_ERROR(lock, "Erroneous flags %d on local lock\n",
1896 ldlm_grant_lock(lock, &rpc_list);
1898 /* FIXME: completion handling not with lr_lock held ! */
1899 if (lock->l_completion_ast)
1900 lock->l_completion_ast(lock, 0, NULL);
1904 ldlm_processing_policy policy;
1905 policy = ldlm_processing_policy_table[res->lr_type];
1906 rc = policy(lock, &pflags, 0, &err, &rpc_list);
1907 if (rc == LDLM_ITER_STOP) {
1908 lock->l_req_mode = old_mode;
1909 if (res->lr_type == LDLM_EXTENT)
1910 ldlm_extent_add_lock(res, lock);
1912 ldlm_granted_list_add_lock(lock, &prev);
1916 *flags |= LDLM_FL_BLOCK_GRANTED;
1920 unlock_res_and_lock(lock);
1923 ldlm_run_ast_work(ns, &rpc_list, LDLM_WORK_CP_AST);
1925 OBD_SLAB_FREE(node, ldlm_interval_slab, sizeof(*node));
1929 void ldlm_lock_dump(int level, struct ldlm_lock *lock, int pos)
1931 struct obd_device *obd = NULL;
1933 if (!((libcfs_debug | D_ERROR) & level))
1937 CDEBUG(level, " NULL LDLM lock\n");
1941 CDEBUG(level," -- Lock dump: %p/"LPX64" (rc: %d) (pos: %d) (pid: %d)\n",
1942 lock, lock->l_handle.h_cookie, cfs_atomic_read(&lock->l_refc),
1944 if (lock->l_conn_export != NULL)
1945 obd = lock->l_conn_export->exp_obd;
1946 if (lock->l_export && lock->l_export->exp_connection) {
1947 CDEBUG(level, " Node: NID %s (rhandle: "LPX64")\n",
1948 libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid),
1949 lock->l_remote_handle.cookie);
1950 } else if (obd == NULL) {
1951 CDEBUG(level, " Node: local\n");
1953 struct obd_import *imp = obd->u.cli.cl_import;
1954 CDEBUG(level, " Node: NID %s (rhandle: "LPX64")\n",
1955 libcfs_nid2str(imp->imp_connection->c_peer.nid),
1956 lock->l_remote_handle.cookie);
1958 CDEBUG(level, " Resource: %p ("LPU64"/"LPU64"/"LPU64")\n",
1960 lock->l_resource->lr_name.name[0],
1961 lock->l_resource->lr_name.name[1],
1962 lock->l_resource->lr_name.name[2]);
1963 CDEBUG(level, " Req mode: %s, grant mode: %s, rc: %u, read: %d, "
1964 "write: %d flags: "LPX64"\n", ldlm_lockname[lock->l_req_mode],
1965 ldlm_lockname[lock->l_granted_mode],
1966 cfs_atomic_read(&lock->l_refc), lock->l_readers, lock->l_writers,
1968 if (lock->l_resource->lr_type == LDLM_EXTENT)
1969 CDEBUG(level, " Extent: "LPU64" -> "LPU64
1970 " (req "LPU64"-"LPU64")\n",
1971 lock->l_policy_data.l_extent.start,
1972 lock->l_policy_data.l_extent.end,
1973 lock->l_req_extent.start, lock->l_req_extent.end);
1974 else if (lock->l_resource->lr_type == LDLM_FLOCK)
1975 CDEBUG(level, " Pid: %d Extent: "LPU64" -> "LPU64"\n",
1976 lock->l_policy_data.l_flock.pid,
1977 lock->l_policy_data.l_flock.start,
1978 lock->l_policy_data.l_flock.end);
1979 else if (lock->l_resource->lr_type == LDLM_IBITS)
1980 CDEBUG(level, " Bits: "LPX64"\n",
1981 lock->l_policy_data.l_inodebits.bits);
1984 void ldlm_lock_dump_handle(int level, struct lustre_handle *lockh)
1986 struct ldlm_lock *lock;
1988 if (!((libcfs_debug | D_ERROR) & level))
1991 lock = ldlm_handle2lock(lockh);
1995 ldlm_lock_dump(D_OTHER, lock, 0);
1997 LDLM_LOCK_PUT(lock);
2000 void _ldlm_lock_debug(struct ldlm_lock *lock, __u32 level,
2001 struct libcfs_debug_msg_data *data, const char *fmt,
2005 cfs_debug_limit_state_t *cdls = data->msg_cdls;
2007 va_start(args, fmt);
2009 if (lock->l_resource == NULL) {
2010 libcfs_debug_vmsg2(cdls, data->msg_subsys, level,data->msg_file,
2011 data->msg_fn, data->msg_line, fmt, args,
2012 " ns: \?\? lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2013 "res: \?\? rrc=\?\? type: \?\?\? flags: "LPX64" remote: "
2014 LPX64" expref: %d pid: %u timeout: %lu\n", lock,
2015 lock->l_handle.h_cookie, cfs_atomic_read(&lock->l_refc),
2016 lock->l_readers, lock->l_writers,
2017 ldlm_lockname[lock->l_granted_mode],
2018 ldlm_lockname[lock->l_req_mode],
2019 lock->l_flags, lock->l_remote_handle.cookie,
2021 cfs_atomic_read(&lock->l_export->exp_refcount) : -99,
2022 lock->l_pid, lock->l_callback_timeout);
2027 switch (lock->l_resource->lr_type) {
2029 libcfs_debug_vmsg2(cdls, data->msg_subsys, level,data->msg_file,
2030 data->msg_fn, data->msg_line, fmt, args,
2031 " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2032 "res: "LPU64"/"LPU64" rrc: %d type: %s ["LPU64"->"LPU64
2033 "] (req "LPU64"->"LPU64") flags: "LPX64" remote: "LPX64
2034 " expref: %d pid: %u timeout %lu\n",
2035 ldlm_lock_to_ns_name(lock), lock,
2036 lock->l_handle.h_cookie, cfs_atomic_read(&lock->l_refc),
2037 lock->l_readers, lock->l_writers,
2038 ldlm_lockname[lock->l_granted_mode],
2039 ldlm_lockname[lock->l_req_mode],
2040 lock->l_resource->lr_name.name[0],
2041 lock->l_resource->lr_name.name[1],
2042 cfs_atomic_read(&lock->l_resource->lr_refcount),
2043 ldlm_typename[lock->l_resource->lr_type],
2044 lock->l_policy_data.l_extent.start,
2045 lock->l_policy_data.l_extent.end,
2046 lock->l_req_extent.start, lock->l_req_extent.end,
2047 lock->l_flags, lock->l_remote_handle.cookie,
2049 cfs_atomic_read(&lock->l_export->exp_refcount) : -99,
2050 lock->l_pid, lock->l_callback_timeout);
2054 libcfs_debug_vmsg2(cdls, data->msg_subsys, level,data->msg_file,
2055 data->msg_fn, data->msg_line, fmt, args,
2056 " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2057 "res: "LPU64"/"LPU64" rrc: %d type: %s pid: %d "
2058 "["LPU64"->"LPU64"] flags: "LPX64" remote: "LPX64
2059 " expref: %d pid: %u timeout: %lu\n",
2060 ldlm_lock_to_ns_name(lock), lock,
2061 lock->l_handle.h_cookie, cfs_atomic_read(&lock->l_refc),
2062 lock->l_readers, lock->l_writers,
2063 ldlm_lockname[lock->l_granted_mode],
2064 ldlm_lockname[lock->l_req_mode],
2065 lock->l_resource->lr_name.name[0],
2066 lock->l_resource->lr_name.name[1],
2067 cfs_atomic_read(&lock->l_resource->lr_refcount),
2068 ldlm_typename[lock->l_resource->lr_type],
2069 lock->l_policy_data.l_flock.pid,
2070 lock->l_policy_data.l_flock.start,
2071 lock->l_policy_data.l_flock.end,
2072 lock->l_flags, lock->l_remote_handle.cookie,
2074 cfs_atomic_read(&lock->l_export->exp_refcount) : -99,
2075 lock->l_pid, lock->l_callback_timeout);
2079 libcfs_debug_vmsg2(cdls, data->msg_subsys, level,data->msg_file,
2080 data->msg_fn, data->msg_line, fmt, args,
2081 " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2082 "res: "LPU64"/"LPU64" bits "LPX64" rrc: %d type: %s "
2083 "flags: "LPX64" remote: "LPX64" expref: %d "
2084 "pid: %u timeout: %lu\n",
2085 ldlm_lock_to_ns_name(lock),
2086 lock, lock->l_handle.h_cookie,
2087 cfs_atomic_read (&lock->l_refc),
2088 lock->l_readers, lock->l_writers,
2089 ldlm_lockname[lock->l_granted_mode],
2090 ldlm_lockname[lock->l_req_mode],
2091 lock->l_resource->lr_name.name[0],
2092 lock->l_resource->lr_name.name[1],
2093 lock->l_policy_data.l_inodebits.bits,
2094 cfs_atomic_read(&lock->l_resource->lr_refcount),
2095 ldlm_typename[lock->l_resource->lr_type],
2096 lock->l_flags, lock->l_remote_handle.cookie,
2098 cfs_atomic_read(&lock->l_export->exp_refcount) : -99,
2099 lock->l_pid, lock->l_callback_timeout);
2103 libcfs_debug_vmsg2(cdls, data->msg_subsys, level,data->msg_file,
2104 data->msg_fn, data->msg_line, fmt, args,
2105 " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2106 "res: "LPU64"/"LPU64" rrc: %d type: %s flags: "LPX64" "
2107 "remote: "LPX64" expref: %d pid: %u timeout %lu\n",
2108 ldlm_lock_to_ns_name(lock),
2109 lock, lock->l_handle.h_cookie,
2110 cfs_atomic_read (&lock->l_refc),
2111 lock->l_readers, lock->l_writers,
2112 ldlm_lockname[lock->l_granted_mode],
2113 ldlm_lockname[lock->l_req_mode],
2114 lock->l_resource->lr_name.name[0],
2115 lock->l_resource->lr_name.name[1],
2116 cfs_atomic_read(&lock->l_resource->lr_refcount),
2117 ldlm_typename[lock->l_resource->lr_type],
2118 lock->l_flags, lock->l_remote_handle.cookie,
2120 cfs_atomic_read(&lock->l_export->exp_refcount) : -99,
2121 lock->l_pid, lock->l_callback_timeout);
2126 EXPORT_SYMBOL(_ldlm_lock_debug);