4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2010, 2015, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/ldlm/ldlm_lock.c
38 * Author: Peter Braam <braam@clusterfs.com>
39 * Author: Phil Schwan <phil@clusterfs.com>
42 #define DEBUG_SUBSYSTEM S_LDLM
44 #include <libcfs/libcfs.h>
46 #include <lustre_swab.h>
47 #include <obd_class.h>
49 #include "ldlm_internal.h"
52 char *ldlm_lockname[] = {
60 [LCK_GROUP] = "GROUP",
63 EXPORT_SYMBOL(ldlm_lockname);
65 char *ldlm_typename[] = {
67 [LDLM_EXTENT] = "EXT",
72 static ldlm_policy_wire_to_local_t ldlm_policy_wire_to_local[] = {
73 [LDLM_PLAIN - LDLM_MIN_TYPE] = ldlm_plain_policy_wire_to_local,
74 [LDLM_EXTENT - LDLM_MIN_TYPE] = ldlm_extent_policy_wire_to_local,
75 [LDLM_FLOCK - LDLM_MIN_TYPE] = ldlm_flock_policy_wire_to_local,
76 [LDLM_IBITS - LDLM_MIN_TYPE] = ldlm_ibits_policy_wire_to_local,
79 static ldlm_policy_local_to_wire_t ldlm_policy_local_to_wire[] = {
80 [LDLM_PLAIN - LDLM_MIN_TYPE] = ldlm_plain_policy_local_to_wire,
81 [LDLM_EXTENT - LDLM_MIN_TYPE] = ldlm_extent_policy_local_to_wire,
82 [LDLM_FLOCK - LDLM_MIN_TYPE] = ldlm_flock_policy_local_to_wire,
83 [LDLM_IBITS - LDLM_MIN_TYPE] = ldlm_ibits_policy_local_to_wire,
87 * Converts lock policy from local format to on the wire lock_desc format
89 void ldlm_convert_policy_to_wire(enum ldlm_type type,
90 const union ldlm_policy_data *lpolicy,
91 union ldlm_wire_policy_data *wpolicy)
93 ldlm_policy_local_to_wire_t convert;
95 convert = ldlm_policy_local_to_wire[type - LDLM_MIN_TYPE];
97 convert(lpolicy, wpolicy);
101 * Converts lock policy from on the wire lock_desc format to local format
103 void ldlm_convert_policy_to_local(struct obd_export *exp, enum ldlm_type type,
104 const union ldlm_wire_policy_data *wpolicy,
105 union ldlm_policy_data *lpolicy)
107 ldlm_policy_wire_to_local_t convert;
109 convert = ldlm_policy_wire_to_local[type - LDLM_MIN_TYPE];
111 convert(wpolicy, lpolicy);
114 const char *ldlm_it2str(enum ldlm_intent_flags it)
121 case (IT_OPEN | IT_CREAT):
136 CERROR("Unknown intent 0x%08x\n", it);
140 EXPORT_SYMBOL(ldlm_it2str);
142 extern struct kmem_cache *ldlm_lock_slab;
144 #ifdef HAVE_SERVER_SUPPORT
145 static ldlm_processing_policy ldlm_processing_policy_table[] = {
146 [LDLM_PLAIN] = ldlm_process_plain_lock,
147 [LDLM_EXTENT] = ldlm_process_extent_lock,
148 [LDLM_FLOCK] = ldlm_process_flock_lock,
149 [LDLM_IBITS] = ldlm_process_inodebits_lock,
152 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res)
154 return ldlm_processing_policy_table[res->lr_type];
156 EXPORT_SYMBOL(ldlm_get_processing_policy);
157 #endif /* HAVE_SERVER_SUPPORT */
159 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg)
163 EXPORT_SYMBOL(ldlm_register_intent);
166 * REFCOUNTED LOCK OBJECTS
171 * Get a reference on a lock.
173 * Lock refcounts, during creation:
174 * - one special one for allocation, dec'd only once in destroy
175 * - one for being a lock that's in-use
176 * - one for the addref associated with a new lock
178 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock)
180 atomic_inc(&lock->l_refc);
183 EXPORT_SYMBOL(ldlm_lock_get);
186 * Release lock reference.
188 * Also frees the lock if it was last reference.
190 void ldlm_lock_put(struct ldlm_lock *lock)
194 LASSERT(lock->l_resource != LP_POISON);
195 LASSERT(atomic_read(&lock->l_refc) > 0);
196 if (atomic_dec_and_test(&lock->l_refc)) {
197 struct ldlm_resource *res;
200 "final lock_put on destroyed lock, freeing it.");
202 res = lock->l_resource;
203 LASSERT(ldlm_is_destroyed(lock));
204 LASSERT(list_empty(&lock->l_exp_list));
205 LASSERT(list_empty(&lock->l_res_link));
206 LASSERT(list_empty(&lock->l_pending_chain));
208 lprocfs_counter_decr(ldlm_res_to_ns(res)->ns_stats,
210 lu_ref_del(&res->lr_reference, "lock", lock);
211 ldlm_resource_putref(res);
212 lock->l_resource = NULL;
213 if (lock->l_export) {
214 class_export_lock_put(lock->l_export, lock);
215 lock->l_export = NULL;
218 if (lock->l_lvb_data != NULL)
219 OBD_FREE_LARGE(lock->l_lvb_data, lock->l_lvb_len);
221 ldlm_interval_free(ldlm_interval_detach(lock));
222 lu_ref_fini(&lock->l_reference);
223 OBD_FREE_RCU(lock, sizeof(*lock), &lock->l_handle);
228 EXPORT_SYMBOL(ldlm_lock_put);
231 * Removes LDLM lock \a lock from LRU. Assumes LRU is already locked.
233 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock)
236 if (!list_empty(&lock->l_lru)) {
237 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
239 LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
240 list_del_init(&lock->l_lru);
241 LASSERT(ns->ns_nr_unused > 0);
249 * Removes LDLM lock \a lock from LRU. Obtains the LRU lock first.
251 * If \a last_use is non-zero, it will remove the lock from LRU only if
252 * it matches lock's l_last_used.
254 * \retval 0 if \a last_use is set, the lock is not in LRU list or \a last_use
255 * doesn't match lock's l_last_used;
256 * otherwise, the lock hasn't been in the LRU list.
257 * \retval 1 the lock was in LRU list and removed.
259 int ldlm_lock_remove_from_lru_check(struct ldlm_lock *lock, cfs_time_t last_use)
261 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
265 if (ldlm_is_ns_srv(lock)) {
266 LASSERT(list_empty(&lock->l_lru));
270 spin_lock(&ns->ns_lock);
271 if (last_use == 0 || last_use == lock->l_last_used)
272 rc = ldlm_lock_remove_from_lru_nolock(lock);
273 spin_unlock(&ns->ns_lock);
279 * Adds LDLM lock \a lock to namespace LRU. Assumes LRU is already locked.
281 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock)
283 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
285 lock->l_last_used = cfs_time_current();
286 LASSERT(list_empty(&lock->l_lru));
287 LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
288 list_add_tail(&lock->l_lru, &ns->ns_unused_list);
289 ldlm_clear_skipped(lock);
290 LASSERT(ns->ns_nr_unused >= 0);
295 * Adds LDLM lock \a lock to namespace LRU. Obtains necessary LRU locks
298 void ldlm_lock_add_to_lru(struct ldlm_lock *lock)
300 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
303 spin_lock(&ns->ns_lock);
304 ldlm_lock_add_to_lru_nolock(lock);
305 spin_unlock(&ns->ns_lock);
310 * Moves LDLM lock \a lock that is already in namespace LRU to the tail of
311 * the LRU. Performs necessary LRU locking
313 void ldlm_lock_touch_in_lru(struct ldlm_lock *lock)
315 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
318 if (ldlm_is_ns_srv(lock)) {
319 LASSERT(list_empty(&lock->l_lru));
324 spin_lock(&ns->ns_lock);
325 if (!list_empty(&lock->l_lru)) {
326 ldlm_lock_remove_from_lru_nolock(lock);
327 ldlm_lock_add_to_lru_nolock(lock);
329 spin_unlock(&ns->ns_lock);
334 * Helper to destroy a locked lock.
336 * Used by ldlm_lock_destroy and ldlm_lock_destroy_nolock
337 * Must be called with l_lock and lr_lock held.
339 * Does not actually free the lock data, but rather marks the lock as
340 * destroyed by setting l_destroyed field in the lock to 1. Destroys a
341 * handle->lock association too, so that the lock can no longer be found
342 * and removes the lock from LRU list. Actual lock freeing occurs when
343 * last lock reference goes away.
345 * Original comment (of some historical value):
346 * This used to have a 'strict' flag, which recovery would use to mark an
347 * in-use lock as needing-to-die. Lest I am ever tempted to put it back, I
348 * shall explain why it's gone: with the new hash table scheme, once you call
349 * ldlm_lock_destroy, you can never drop your final references on this lock.
350 * Because it's not in the hash table anymore. -phil
352 static int ldlm_lock_destroy_internal(struct ldlm_lock *lock)
356 if (lock->l_readers || lock->l_writers) {
357 LDLM_ERROR(lock, "lock still has references");
361 if (!list_empty(&lock->l_res_link)) {
362 LDLM_ERROR(lock, "lock still on resource");
366 if (ldlm_is_destroyed(lock)) {
367 LASSERT(list_empty(&lock->l_lru));
371 ldlm_set_destroyed(lock);
373 if (lock->l_export && lock->l_export->exp_lock_hash) {
374 /* NB: it's safe to call cfs_hash_del() even lock isn't
375 * in exp_lock_hash. */
376 /* In the function below, .hs_keycmp resolves to
377 * ldlm_export_lock_keycmp() */
378 /* coverity[overrun-buffer-val] */
379 cfs_hash_del(lock->l_export->exp_lock_hash,
380 &lock->l_remote_handle, &lock->l_exp_hash);
383 ldlm_lock_remove_from_lru(lock);
384 class_handle_unhash(&lock->l_handle);
387 /* Wake anyone waiting for this lock */
388 /* FIXME: I should probably add yet another flag, instead of using
389 * l_export to only call this on clients */
391 class_export_put(lock->l_export);
392 lock->l_export = NULL;
393 if (lock->l_export && lock->l_completion_ast)
394 lock->l_completion_ast(lock, 0);
401 * Destroys a LDLM lock \a lock. Performs necessary locking first.
403 void ldlm_lock_destroy(struct ldlm_lock *lock)
407 lock_res_and_lock(lock);
408 first = ldlm_lock_destroy_internal(lock);
409 unlock_res_and_lock(lock);
411 /* drop reference from hashtable only for first destroy */
413 lu_ref_del(&lock->l_reference, "hash", lock);
414 LDLM_LOCK_RELEASE(lock);
420 * Destroys a LDLM lock \a lock that is already locked.
422 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock)
426 first = ldlm_lock_destroy_internal(lock);
427 /* drop reference from hashtable only for first destroy */
429 lu_ref_del(&lock->l_reference, "hash", lock);
430 LDLM_LOCK_RELEASE(lock);
435 /* this is called by portals_handle2object with the handle lock taken */
436 static void lock_handle_addref(void *lock)
438 LDLM_LOCK_GET((struct ldlm_lock *)lock);
441 static void lock_handle_free(void *lock, int size)
443 LASSERT(size == sizeof(struct ldlm_lock));
444 OBD_SLAB_FREE(lock, ldlm_lock_slab, size);
447 static struct portals_handle_ops lock_handle_ops = {
448 .hop_addref = lock_handle_addref,
449 .hop_free = lock_handle_free,
454 * Allocate and initialize new lock structure.
456 * usage: pass in a resource on which you have done ldlm_resource_get
457 * new lock will take over the refcount.
458 * returns: lock with refcount 2 - one for current caller and one for remote
460 static struct ldlm_lock *ldlm_lock_new(struct ldlm_resource *resource)
462 struct ldlm_lock *lock;
465 if (resource == NULL)
468 OBD_SLAB_ALLOC_PTR_GFP(lock, ldlm_lock_slab, GFP_NOFS);
472 spin_lock_init(&lock->l_lock);
473 lock->l_resource = resource;
474 lu_ref_add(&resource->lr_reference, "lock", lock);
476 atomic_set(&lock->l_refc, 2);
477 INIT_LIST_HEAD(&lock->l_res_link);
478 INIT_LIST_HEAD(&lock->l_lru);
479 INIT_LIST_HEAD(&lock->l_pending_chain);
480 INIT_LIST_HEAD(&lock->l_bl_ast);
481 INIT_LIST_HEAD(&lock->l_cp_ast);
482 INIT_LIST_HEAD(&lock->l_rk_ast);
483 init_waitqueue_head(&lock->l_waitq);
484 lock->l_blocking_lock = NULL;
485 INIT_LIST_HEAD(&lock->l_sl_mode);
486 INIT_LIST_HEAD(&lock->l_sl_policy);
487 INIT_HLIST_NODE(&lock->l_exp_hash);
488 INIT_HLIST_NODE(&lock->l_exp_flock_hash);
490 lprocfs_counter_incr(ldlm_res_to_ns(resource)->ns_stats,
492 INIT_LIST_HEAD(&lock->l_handle.h_link);
493 class_handle_hash(&lock->l_handle, &lock_handle_ops);
495 lu_ref_init(&lock->l_reference);
496 lu_ref_add(&lock->l_reference, "hash", lock);
497 lock->l_callback_timeout = 0;
499 #if LUSTRE_TRACKS_LOCK_EXP_REFS
500 INIT_LIST_HEAD(&lock->l_exp_refs_link);
501 lock->l_exp_refs_nr = 0;
502 lock->l_exp_refs_target = NULL;
504 INIT_LIST_HEAD(&lock->l_exp_list);
510 * Moves LDLM lock \a lock to another resource.
511 * This is used on client when server returns some other lock than requested
512 * (typically as a result of intent operation)
514 int ldlm_lock_change_resource(struct ldlm_namespace *ns, struct ldlm_lock *lock,
515 const struct ldlm_res_id *new_resid)
517 struct ldlm_resource *oldres = lock->l_resource;
518 struct ldlm_resource *newres;
522 LASSERT(ns_is_client(ns));
524 lock_res_and_lock(lock);
525 if (memcmp(new_resid, &lock->l_resource->lr_name,
526 sizeof(lock->l_resource->lr_name)) == 0) {
528 unlock_res_and_lock(lock);
532 LASSERT(new_resid->name[0] != 0);
534 /* This function assumes that the lock isn't on any lists */
535 LASSERT(list_empty(&lock->l_res_link));
537 type = oldres->lr_type;
538 unlock_res_and_lock(lock);
540 newres = ldlm_resource_get(ns, NULL, new_resid, type, 1);
542 RETURN(PTR_ERR(newres));
544 lu_ref_add(&newres->lr_reference, "lock", lock);
546 * To flip the lock from the old to the new resource, lock, oldres and
547 * newres have to be locked. Resource spin-locks are nested within
548 * lock->l_lock, and are taken in the memory address order to avoid
551 spin_lock(&lock->l_lock);
552 oldres = lock->l_resource;
553 if (oldres < newres) {
555 lock_res_nested(newres, LRT_NEW);
558 lock_res_nested(oldres, LRT_NEW);
560 LASSERT(memcmp(new_resid, &oldres->lr_name,
561 sizeof oldres->lr_name) != 0);
562 lock->l_resource = newres;
564 unlock_res_and_lock(lock);
566 /* ...and the flowers are still standing! */
567 lu_ref_del(&oldres->lr_reference, "lock", lock);
568 ldlm_resource_putref(oldres);
573 /** \defgroup ldlm_handles LDLM HANDLES
574 * Ways to get hold of locks without any addresses.
579 * Fills in handle for LDLM lock \a lock into supplied \a lockh
580 * Does not take any references.
582 void ldlm_lock2handle(const struct ldlm_lock *lock, struct lustre_handle *lockh)
584 lockh->cookie = lock->l_handle.h_cookie;
586 EXPORT_SYMBOL(ldlm_lock2handle);
589 * Obtain a lock reference by handle.
591 * if \a flags: atomically get the lock and set the flags.
592 * Return NULL if flag already set
594 struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *handle,
597 struct ldlm_lock *lock;
602 lock = class_handle2object(handle->cookie, NULL);
606 /* It's unlikely but possible that someone marked the lock as
607 * destroyed after we did handle2object on it */
608 if ((flags == 0) && !ldlm_is_destroyed(lock)) {
609 lu_ref_add(&lock->l_reference, "handle", current);
613 lock_res_and_lock(lock);
615 LASSERT(lock->l_resource != NULL);
617 lu_ref_add_atomic(&lock->l_reference, "handle", current);
618 if (unlikely(ldlm_is_destroyed(lock))) {
619 unlock_res_and_lock(lock);
620 CDEBUG(D_INFO, "lock already destroyed: lock %p\n", lock);
625 /* If we're setting flags, make sure none of them are already set. */
627 if ((lock->l_flags & flags) != 0) {
628 unlock_res_and_lock(lock);
633 lock->l_flags |= flags;
636 unlock_res_and_lock(lock);
639 EXPORT_SYMBOL(__ldlm_handle2lock);
640 /** @} ldlm_handles */
643 * Fill in "on the wire" representation for given LDLM lock into supplied
644 * lock descriptor \a desc structure.
646 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc)
648 ldlm_res2desc(lock->l_resource, &desc->l_resource);
649 desc->l_req_mode = lock->l_req_mode;
650 desc->l_granted_mode = lock->l_granted_mode;
651 ldlm_convert_policy_to_wire(lock->l_resource->lr_type,
652 &lock->l_policy_data,
653 &desc->l_policy_data);
657 * Add a lock to list of conflicting locks to send AST to.
659 * Only add if we have not sent a blocking AST to the lock yet.
661 static void ldlm_add_bl_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
662 struct list_head *work_list)
664 if (!ldlm_is_ast_sent(lock)) {
665 LDLM_DEBUG(lock, "lock incompatible; sending blocking AST.");
666 ldlm_set_ast_sent(lock);
667 /* If the enqueuing client said so, tell the AST recipient to
668 * discard dirty data, rather than writing back. */
669 if (ldlm_is_ast_discard_data(new))
670 ldlm_set_discard_data(lock);
671 LASSERT(list_empty(&lock->l_bl_ast));
672 list_add(&lock->l_bl_ast, work_list);
674 LASSERT(lock->l_blocking_lock == NULL);
675 lock->l_blocking_lock = LDLM_LOCK_GET(new);
680 * Add a lock to list of just granted locks to send completion AST to.
682 static void ldlm_add_cp_work_item(struct ldlm_lock *lock,
683 struct list_head *work_list)
685 if (!ldlm_is_cp_reqd(lock)) {
686 ldlm_set_cp_reqd(lock);
687 LDLM_DEBUG(lock, "lock granted; sending completion AST.");
688 LASSERT(list_empty(&lock->l_cp_ast));
689 list_add(&lock->l_cp_ast, work_list);
695 * Aggregator function to add AST work items into a list. Determines
696 * what sort of an AST work needs to be done and calls the proper
698 * Must be called with lr_lock held.
700 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
701 struct list_head *work_list)
704 check_res_locked(lock->l_resource);
706 ldlm_add_bl_work_item(lock, new, work_list);
708 ldlm_add_cp_work_item(lock, work_list);
713 * Add specified reader/writer reference to LDLM lock with handle \a lockh.
714 * r/w reference type is determined by \a mode
715 * Calls ldlm_lock_addref_internal.
717 void ldlm_lock_addref(const struct lustre_handle *lockh, enum ldlm_mode mode)
719 struct ldlm_lock *lock;
721 lock = ldlm_handle2lock(lockh);
722 LASSERTF(lock != NULL, "Non-existing lock: "LPX64"\n", lockh->cookie);
723 ldlm_lock_addref_internal(lock, mode);
726 EXPORT_SYMBOL(ldlm_lock_addref);
730 * Add specified reader/writer reference to LDLM lock \a lock.
731 * r/w reference type is determined by \a mode
732 * Removes lock from LRU if it is there.
733 * Assumes the LDLM lock is already locked.
735 void ldlm_lock_addref_internal_nolock(struct ldlm_lock *lock,
738 ldlm_lock_remove_from_lru(lock);
739 if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
741 lu_ref_add_atomic(&lock->l_reference, "reader", lock);
743 if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP | LCK_COS)) {
745 lu_ref_add_atomic(&lock->l_reference, "writer", lock);
748 lu_ref_add_atomic(&lock->l_reference, "user", lock);
749 LDLM_DEBUG(lock, "ldlm_lock_addref(%s)", ldlm_lockname[mode]);
753 * Attempts to add reader/writer reference to a lock with handle \a lockh, and
754 * fails if lock is already LDLM_FL_CBPENDING or destroyed.
756 * \retval 0 success, lock was addref-ed
758 * \retval -EAGAIN lock is being canceled.
760 int ldlm_lock_addref_try(const struct lustre_handle *lockh, enum ldlm_mode mode)
762 struct ldlm_lock *lock;
766 lock = ldlm_handle2lock(lockh);
768 lock_res_and_lock(lock);
769 if (lock->l_readers != 0 || lock->l_writers != 0 ||
770 !ldlm_is_cbpending(lock)) {
771 ldlm_lock_addref_internal_nolock(lock, mode);
774 unlock_res_and_lock(lock);
779 EXPORT_SYMBOL(ldlm_lock_addref_try);
782 * Add specified reader/writer reference to LDLM lock \a lock.
783 * Locks LDLM lock and calls ldlm_lock_addref_internal_nolock to do the work.
784 * Only called for local locks.
786 void ldlm_lock_addref_internal(struct ldlm_lock *lock, enum ldlm_mode mode)
788 lock_res_and_lock(lock);
789 ldlm_lock_addref_internal_nolock(lock, mode);
790 unlock_res_and_lock(lock);
794 * Removes reader/writer reference for LDLM lock \a lock.
795 * Assumes LDLM lock is already locked.
796 * only called in ldlm_flock_destroy and for local locks.
797 * Does NOT add lock to LRU if no r/w references left to accomodate flock locks
798 * that cannot be placed in LRU.
800 void ldlm_lock_decref_internal_nolock(struct ldlm_lock *lock,
803 LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
804 if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
805 LASSERT(lock->l_readers > 0);
806 lu_ref_del(&lock->l_reference, "reader", lock);
809 if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP | LCK_COS)) {
810 LASSERT(lock->l_writers > 0);
811 lu_ref_del(&lock->l_reference, "writer", lock);
815 lu_ref_del(&lock->l_reference, "user", lock);
816 LDLM_LOCK_RELEASE(lock); /* matches the LDLM_LOCK_GET() in addref */
820 * Removes reader/writer reference for LDLM lock \a lock.
821 * Locks LDLM lock first.
822 * If the lock is determined to be client lock on a client and r/w refcount
823 * drops to zero and the lock is not blocked, the lock is added to LRU lock
825 * For blocked LDLM locks if r/w count drops to zero, blocking_ast is called.
827 void ldlm_lock_decref_internal(struct ldlm_lock *lock, enum ldlm_mode mode)
829 struct ldlm_namespace *ns;
832 lock_res_and_lock(lock);
834 ns = ldlm_lock_to_ns(lock);
836 ldlm_lock_decref_internal_nolock(lock, mode);
838 if ((ldlm_is_local(lock) || lock->l_req_mode == LCK_GROUP) &&
839 !lock->l_readers && !lock->l_writers) {
840 /* If this is a local lock on a server namespace and this was
841 * the last reference, cancel the lock.
843 * Group locks are special:
844 * They must not go in LRU, but they are not called back
845 * like non-group locks, instead they are manually released.
846 * They have an l_writers reference which they keep until
847 * they are manually released, so we remove them when they have
848 * no more reader or writer references. - LU-6368 */
849 ldlm_set_cbpending(lock);
852 if (!lock->l_readers && !lock->l_writers && ldlm_is_cbpending(lock)) {
853 /* If we received a blocked AST and this was the last reference,
854 * run the callback. */
855 if (ldlm_is_ns_srv(lock) && lock->l_export)
856 CERROR("FL_CBPENDING set on non-local lock--just a "
859 LDLM_DEBUG(lock, "final decref done on cbpending lock");
861 LDLM_LOCK_GET(lock); /* dropped by bl thread */
862 ldlm_lock_remove_from_lru(lock);
863 unlock_res_and_lock(lock);
865 if (ldlm_is_fail_loc(lock))
866 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
868 if (ldlm_is_atomic_cb(lock) ||
869 ldlm_bl_to_thread_lock(ns, NULL, lock) != 0)
870 ldlm_handle_bl_callback(ns, NULL, lock);
871 } else if (ns_is_client(ns) &&
872 !lock->l_readers && !lock->l_writers &&
873 !ldlm_is_no_lru(lock) &&
874 !ldlm_is_bl_ast(lock)) {
876 LDLM_DEBUG(lock, "add lock into lru list");
878 /* If this is a client-side namespace and this was the last
879 * reference, put it on the LRU. */
880 ldlm_lock_add_to_lru(lock);
881 unlock_res_and_lock(lock);
883 if (ldlm_is_fail_loc(lock))
884 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
886 /* Call ldlm_cancel_lru() only if EARLY_CANCEL and LRU RESIZE
887 * are not supported by the server, otherwise, it is done on
889 if (!exp_connect_cancelset(lock->l_conn_export) &&
890 !ns_connect_lru_resize(ns))
891 ldlm_cancel_lru(ns, 0, LCF_ASYNC, 0);
893 LDLM_DEBUG(lock, "do not add lock into lru list");
894 unlock_res_and_lock(lock);
901 * Decrease reader/writer refcount for LDLM lock with handle \a lockh
903 void ldlm_lock_decref(const struct lustre_handle *lockh, enum ldlm_mode mode)
905 struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
906 LASSERTF(lock != NULL, "Non-existing lock: "LPX64"\n", lockh->cookie);
907 ldlm_lock_decref_internal(lock, mode);
910 EXPORT_SYMBOL(ldlm_lock_decref);
913 * Decrease reader/writer refcount for LDLM lock with handle
914 * \a lockh and mark it for subsequent cancellation once r/w refcount
915 * drops to zero instead of putting into LRU.
918 void ldlm_lock_decref_and_cancel(const struct lustre_handle *lockh,
921 struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
924 LASSERT(lock != NULL);
926 LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
927 lock_res_and_lock(lock);
928 ldlm_set_cbpending(lock);
929 unlock_res_and_lock(lock);
930 ldlm_lock_decref_internal(lock, mode);
933 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
935 struct sl_insert_point {
936 struct list_head *res_link;
937 struct list_head *mode_link;
938 struct list_head *policy_link;
942 * Finds a position to insert the new lock into granted lock list.
944 * Used for locks eligible for skiplist optimization.
947 * queue [input]: the granted list where search acts on;
948 * req [input]: the lock whose position to be located;
949 * prev [output]: positions within 3 lists to insert @req to
953 * - ldlm_grant_lock_with_skiplist
955 static void search_granted_lock(struct list_head *queue,
956 struct ldlm_lock *req,
957 struct sl_insert_point *prev)
959 struct list_head *tmp;
960 struct ldlm_lock *lock, *mode_end, *policy_end;
963 list_for_each(tmp, queue) {
964 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
966 mode_end = list_entry(lock->l_sl_mode.prev,
967 struct ldlm_lock, l_sl_mode);
969 if (lock->l_req_mode != req->l_req_mode) {
970 /* jump to last lock of mode group */
971 tmp = &mode_end->l_res_link;
975 /* suitable mode group is found */
976 if (lock->l_resource->lr_type == LDLM_PLAIN) {
977 /* insert point is last lock of the mode group */
978 prev->res_link = &mode_end->l_res_link;
979 prev->mode_link = &mode_end->l_sl_mode;
980 prev->policy_link = &req->l_sl_policy;
983 } else if (lock->l_resource->lr_type == LDLM_IBITS) {
986 list_entry(lock->l_sl_policy.prev,
990 if (lock->l_policy_data.l_inodebits.bits ==
991 req->l_policy_data.l_inodebits.bits) {
992 /* insert point is last lock of
993 * the policy group */
995 &policy_end->l_res_link;
997 &policy_end->l_sl_mode;
999 &policy_end->l_sl_policy;
1004 if (policy_end == mode_end)
1005 /* done with mode group */
1008 /* go to next policy group within mode group */
1009 tmp = policy_end->l_res_link.next;
1010 lock = list_entry(tmp, struct ldlm_lock,
1012 } /* loop over policy groups within the mode group */
1014 /* insert point is last lock of the mode group,
1015 * new policy group is started */
1016 prev->res_link = &mode_end->l_res_link;
1017 prev->mode_link = &mode_end->l_sl_mode;
1018 prev->policy_link = &req->l_sl_policy;
1022 LDLM_ERROR(lock,"is not LDLM_PLAIN or LDLM_IBITS lock");
1027 /* insert point is last lock on the queue,
1028 * new mode group and new policy group are started */
1029 prev->res_link = queue->prev;
1030 prev->mode_link = &req->l_sl_mode;
1031 prev->policy_link = &req->l_sl_policy;
1037 * Add a lock into resource granted list after a position described by
1040 static void ldlm_granted_list_add_lock(struct ldlm_lock *lock,
1041 struct sl_insert_point *prev)
1043 struct ldlm_resource *res = lock->l_resource;
1046 check_res_locked(res);
1048 ldlm_resource_dump(D_INFO, res);
1049 LDLM_DEBUG(lock, "About to add lock:");
1051 if (ldlm_is_destroyed(lock)) {
1052 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1056 LASSERT(list_empty(&lock->l_res_link));
1057 LASSERT(list_empty(&lock->l_sl_mode));
1058 LASSERT(list_empty(&lock->l_sl_policy));
1061 * lock->link == prev->link means lock is first starting the group.
1062 * Don't re-add to itself to suppress kernel warnings.
1064 if (&lock->l_res_link != prev->res_link)
1065 list_add(&lock->l_res_link, prev->res_link);
1066 if (&lock->l_sl_mode != prev->mode_link)
1067 list_add(&lock->l_sl_mode, prev->mode_link);
1068 if (&lock->l_sl_policy != prev->policy_link)
1069 list_add(&lock->l_sl_policy, prev->policy_link);
1075 * Add a lock to granted list on a resource maintaining skiplist
1078 static void ldlm_grant_lock_with_skiplist(struct ldlm_lock *lock)
1080 struct sl_insert_point prev;
1083 LASSERT(lock->l_req_mode == lock->l_granted_mode);
1085 search_granted_lock(&lock->l_resource->lr_granted, lock, &prev);
1086 ldlm_granted_list_add_lock(lock, &prev);
1091 * Perform lock granting bookkeeping.
1093 * Includes putting the lock into granted list and updating lock mode.
1095 * - ldlm_lock_enqueue
1096 * - ldlm_reprocess_queue
1097 * - ldlm_lock_convert
1099 * must be called with lr_lock held
1101 void ldlm_grant_lock(struct ldlm_lock *lock, struct list_head *work_list)
1103 struct ldlm_resource *res = lock->l_resource;
1106 check_res_locked(res);
1108 lock->l_granted_mode = lock->l_req_mode;
1110 if (work_list && lock->l_completion_ast != NULL)
1111 ldlm_add_ast_work_item(lock, NULL, work_list);
1113 if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS)
1114 ldlm_grant_lock_with_skiplist(lock);
1115 else if (res->lr_type == LDLM_EXTENT)
1116 ldlm_extent_add_lock(res, lock);
1117 else if (res->lr_type == LDLM_FLOCK) {
1118 /* We should not add locks to granted list in the following
1120 * - this is an UNLOCK but not a real lock;
1121 * - this is a TEST lock;
1122 * - this is a F_CANCELLK lock (async flock has req_mode == 0)
1123 * - this is a deadlock (flock cannot be granted) */
1124 if (lock->l_req_mode == 0 ||
1125 lock->l_req_mode == LCK_NL ||
1126 ldlm_is_test_lock(lock) ||
1127 ldlm_is_flock_deadlock(lock))
1129 ldlm_resource_add_lock(res, &res->lr_granted, lock);
1134 ldlm_pool_add(&ldlm_res_to_ns(res)->ns_pool, lock);
1139 * Describe the overlap between two locks. itree_overlap_cb data.
1141 struct lock_match_data {
1142 struct ldlm_lock *lmd_old;
1143 struct ldlm_lock *lmd_lock;
1144 enum ldlm_mode *lmd_mode;
1145 union ldlm_policy_data *lmd_policy;
1151 * Check if the given @lock meets the criteria for a match.
1152 * A reference on the lock is taken if matched.
1154 * \param lock test-against this lock
1155 * \param data parameters
1157 static int lock_matches(struct ldlm_lock *lock, struct lock_match_data *data)
1159 union ldlm_policy_data *lpol = &lock->l_policy_data;
1160 enum ldlm_mode match;
1162 if (lock == data->lmd_old)
1163 return INTERVAL_ITER_STOP;
1165 /* Check if this lock can be matched.
1166 * Used by LU-2919(exclusive open) for open lease lock */
1167 if (ldlm_is_excl(lock))
1168 return INTERVAL_ITER_CONT;
1170 /* llite sometimes wants to match locks that will be
1171 * canceled when their users drop, but we allow it to match
1172 * if it passes in CBPENDING and the lock still has users.
1173 * this is generally only going to be used by children
1174 * whose parents already hold a lock so forward progress
1175 * can still happen. */
1176 if (ldlm_is_cbpending(lock) &&
1177 !(data->lmd_flags & LDLM_FL_CBPENDING))
1178 return INTERVAL_ITER_CONT;
1179 if (!data->lmd_unref && ldlm_is_cbpending(lock) &&
1180 lock->l_readers == 0 && lock->l_writers == 0)
1181 return INTERVAL_ITER_CONT;
1183 if (!(lock->l_req_mode & *data->lmd_mode))
1184 return INTERVAL_ITER_CONT;
1185 match = lock->l_req_mode;
1187 switch (lock->l_resource->lr_type) {
1189 if (lpol->l_extent.start > data->lmd_policy->l_extent.start ||
1190 lpol->l_extent.end < data->lmd_policy->l_extent.end)
1191 return INTERVAL_ITER_CONT;
1193 if (unlikely(match == LCK_GROUP) &&
1194 data->lmd_policy->l_extent.gid != LDLM_GID_ANY &&
1195 lpol->l_extent.gid != data->lmd_policy->l_extent.gid)
1196 return INTERVAL_ITER_CONT;
1199 /* We match if we have existing lock with same or wider set
1201 if ((lpol->l_inodebits.bits &
1202 data->lmd_policy->l_inodebits.bits) !=
1203 data->lmd_policy->l_inodebits.bits)
1204 return INTERVAL_ITER_CONT;
1210 /* We match if we have existing lock with same or wider set
1212 if (!data->lmd_unref && LDLM_HAVE_MASK(lock, GONE))
1213 return INTERVAL_ITER_CONT;
1215 if (!equi(data->lmd_flags & LDLM_FL_LOCAL_ONLY, ldlm_is_local(lock)))
1216 return INTERVAL_ITER_CONT;
1218 if (data->lmd_flags & LDLM_FL_TEST_LOCK) {
1219 LDLM_LOCK_GET(lock);
1220 ldlm_lock_touch_in_lru(lock);
1222 ldlm_lock_addref_internal_nolock(lock, match);
1225 *data->lmd_mode = match;
1226 data->lmd_lock = lock;
1228 return INTERVAL_ITER_STOP;
1231 static unsigned int itree_overlap_cb(struct interval_node *in, void *args)
1233 struct ldlm_interval *node = to_ldlm_interval(in);
1234 struct lock_match_data *data = args;
1235 struct ldlm_lock *lock;
1238 list_for_each_entry(lock, &node->li_group, l_sl_policy) {
1239 rc = lock_matches(lock, data);
1240 if (rc == INTERVAL_ITER_STOP)
1241 return INTERVAL_ITER_STOP;
1243 return INTERVAL_ITER_CONT;
1247 * Search for a lock with given parameters in interval trees.
1249 * \param res search for a lock in this resource
1250 * \param data parameters
1252 * \retval a referenced lock or NULL.
1254 static struct ldlm_lock *search_itree(struct ldlm_resource *res,
1255 struct lock_match_data *data)
1257 struct interval_node_extent ext = {
1258 .start = data->lmd_policy->l_extent.start,
1259 .end = data->lmd_policy->l_extent.end
1263 for (idx = 0; idx < LCK_MODE_NUM; idx++) {
1264 struct ldlm_interval_tree *tree = &res->lr_itree[idx];
1266 if (tree->lit_root == NULL)
1269 if (!(tree->lit_mode & *data->lmd_mode))
1272 interval_search(tree->lit_root, &ext,
1273 itree_overlap_cb, data);
1275 return data->lmd_lock;
1280 * Search for a lock with given properties in a queue.
1282 * \param queue search for a lock in this queue
1283 * \param data parameters
1285 * \retval a referenced lock or NULL.
1287 static struct ldlm_lock *search_queue(struct list_head *queue,
1288 struct lock_match_data *data)
1290 struct ldlm_lock *lock;
1293 list_for_each_entry(lock, queue, l_res_link) {
1294 rc = lock_matches(lock, data);
1295 if (rc == INTERVAL_ITER_STOP)
1296 return data->lmd_lock;
1301 void ldlm_lock_fail_match_locked(struct ldlm_lock *lock)
1303 if ((lock->l_flags & LDLM_FL_FAIL_NOTIFIED) == 0) {
1304 lock->l_flags |= LDLM_FL_FAIL_NOTIFIED;
1305 wake_up_all(&lock->l_waitq);
1308 EXPORT_SYMBOL(ldlm_lock_fail_match_locked);
1310 void ldlm_lock_fail_match(struct ldlm_lock *lock)
1312 lock_res_and_lock(lock);
1313 ldlm_lock_fail_match_locked(lock);
1314 unlock_res_and_lock(lock);
1318 * Mark lock as "matchable" by OST.
1320 * Used to prevent certain races in LOV/OSC where the lock is granted, but LVB
1322 * Assumes LDLM lock is already locked.
1324 void ldlm_lock_allow_match_locked(struct ldlm_lock *lock)
1326 ldlm_set_lvb_ready(lock);
1327 wake_up_all(&lock->l_waitq);
1329 EXPORT_SYMBOL(ldlm_lock_allow_match_locked);
1332 * Mark lock as "matchable" by OST.
1333 * Locks the lock and then \see ldlm_lock_allow_match_locked
1335 void ldlm_lock_allow_match(struct ldlm_lock *lock)
1337 lock_res_and_lock(lock);
1338 ldlm_lock_allow_match_locked(lock);
1339 unlock_res_and_lock(lock);
1341 EXPORT_SYMBOL(ldlm_lock_allow_match);
1344 * Attempt to find a lock with specified properties.
1346 * Typically returns a reference to matched lock unless LDLM_FL_TEST_LOCK is
1349 * Can be called in two ways:
1351 * If 'ns' is NULL, then lockh describes an existing lock that we want to look
1352 * for a duplicate of.
1354 * Otherwise, all of the fields must be filled in, to match against.
1356 * If 'flags' contains LDLM_FL_LOCAL_ONLY, then only match local locks on the
1357 * server (ie, connh is NULL)
1358 * If 'flags' contains LDLM_FL_BLOCK_GRANTED, then only locks on the granted
1359 * list will be considered
1360 * If 'flags' contains LDLM_FL_CBPENDING, then locks that have been marked
1361 * to be canceled can still be matched as long as they still have reader
1362 * or writer refernces
1363 * If 'flags' contains LDLM_FL_TEST_LOCK, then don't actually reference a lock,
1364 * just tell us if we would have matched.
1366 * \retval 1 if it finds an already-existing lock that is compatible; in this
1367 * case, lockh is filled in with a addref()ed lock
1369 * We also check security context, and if that fails we simply return 0 (to
1370 * keep caller code unchanged), the context failure will be discovered by
1371 * caller sometime later.
1373 enum ldlm_mode ldlm_lock_match(struct ldlm_namespace *ns, __u64 flags,
1374 const struct ldlm_res_id *res_id,
1375 enum ldlm_type type,
1376 union ldlm_policy_data *policy,
1377 enum ldlm_mode mode,
1378 struct lustre_handle *lockh, int unref)
1380 struct lock_match_data data = {
1384 .lmd_policy = policy,
1388 struct ldlm_resource *res;
1389 struct ldlm_lock *lock;
1394 data.lmd_old = ldlm_handle2lock(lockh);
1395 LASSERT(data.lmd_old != NULL);
1397 ns = ldlm_lock_to_ns(data.lmd_old);
1398 res_id = &data.lmd_old->l_resource->lr_name;
1399 type = data.lmd_old->l_resource->lr_type;
1400 *data.lmd_mode = data.lmd_old->l_req_mode;
1403 res = ldlm_resource_get(ns, NULL, res_id, type, 0);
1405 LASSERT(data.lmd_old == NULL);
1409 LDLM_RESOURCE_ADDREF(res);
1412 if (res->lr_type == LDLM_EXTENT)
1413 lock = search_itree(res, &data);
1415 lock = search_queue(&res->lr_granted, &data);
1418 if (flags & LDLM_FL_BLOCK_GRANTED)
1420 lock = search_queue(&res->lr_converting, &data);
1423 lock = search_queue(&res->lr_waiting, &data);
1430 LDLM_RESOURCE_DELREF(res);
1431 ldlm_resource_putref(res);
1434 ldlm_lock2handle(lock, lockh);
1435 if ((flags & LDLM_FL_LVB_READY) &&
1436 (!ldlm_is_lvb_ready(lock))) {
1437 __u64 wait_flags = LDLM_FL_LVB_READY |
1438 LDLM_FL_DESTROYED | LDLM_FL_FAIL_NOTIFIED;
1439 struct l_wait_info lwi;
1440 if (lock->l_completion_ast) {
1441 int err = lock->l_completion_ast(lock,
1442 LDLM_FL_WAIT_NOREPROC,
1445 if (flags & LDLM_FL_TEST_LOCK)
1446 LDLM_LOCK_RELEASE(lock);
1448 ldlm_lock_decref_internal(lock,
1455 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout),
1456 NULL, LWI_ON_SIGNAL_NOOP, NULL);
1458 /* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
1459 l_wait_event(lock->l_waitq,
1460 lock->l_flags & wait_flags,
1462 if (!ldlm_is_lvb_ready(lock)) {
1463 if (flags & LDLM_FL_TEST_LOCK)
1464 LDLM_LOCK_RELEASE(lock);
1466 ldlm_lock_decref_internal(lock, mode);
1473 LDLM_DEBUG(lock, "matched ("LPU64" "LPU64")",
1474 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1475 res_id->name[2] : policy->l_extent.start,
1476 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1477 res_id->name[3] : policy->l_extent.end);
1479 /* check user's security context */
1480 if (lock->l_conn_export &&
1481 sptlrpc_import_check_ctx(
1482 class_exp2cliimp(lock->l_conn_export))) {
1483 if (!(flags & LDLM_FL_TEST_LOCK))
1484 ldlm_lock_decref_internal(lock, mode);
1488 if (flags & LDLM_FL_TEST_LOCK)
1489 LDLM_LOCK_RELEASE(lock);
1491 } else if (!(flags & LDLM_FL_TEST_LOCK)) {/*less verbose for test-only*/
1492 LDLM_DEBUG_NOLOCK("not matched ns %p type %u mode %u res "
1493 LPU64"/"LPU64" ("LPU64" "LPU64")", ns,
1494 type, mode, res_id->name[0], res_id->name[1],
1495 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1496 res_id->name[2] :policy->l_extent.start,
1497 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1498 res_id->name[3] : policy->l_extent.end);
1500 if (data.lmd_old != NULL)
1501 LDLM_LOCK_PUT(data.lmd_old);
1503 return rc ? mode : 0;
1505 EXPORT_SYMBOL(ldlm_lock_match);
1507 enum ldlm_mode ldlm_revalidate_lock_handle(const struct lustre_handle *lockh,
1510 struct ldlm_lock *lock;
1511 enum ldlm_mode mode = 0;
1514 lock = ldlm_handle2lock(lockh);
1516 lock_res_and_lock(lock);
1517 if (LDLM_HAVE_MASK(lock, GONE))
1520 if (ldlm_is_cbpending(lock) &&
1521 lock->l_readers == 0 && lock->l_writers == 0)
1525 *bits = lock->l_policy_data.l_inodebits.bits;
1526 mode = lock->l_granted_mode;
1527 ldlm_lock_addref_internal_nolock(lock, mode);
1534 unlock_res_and_lock(lock);
1535 LDLM_LOCK_PUT(lock);
1539 EXPORT_SYMBOL(ldlm_revalidate_lock_handle);
1541 /** The caller must guarantee that the buffer is large enough. */
1542 int ldlm_fill_lvb(struct ldlm_lock *lock, struct req_capsule *pill,
1543 enum req_location loc, void *data, int size)
1548 LASSERT(data != NULL);
1551 switch (lock->l_lvb_type) {
1553 if (size == sizeof(struct ost_lvb)) {
1554 if (loc == RCL_CLIENT)
1555 lvb = req_capsule_client_swab_get(pill,
1557 lustre_swab_ost_lvb);
1559 lvb = req_capsule_server_swab_get(pill,
1561 lustre_swab_ost_lvb);
1562 if (unlikely(lvb == NULL)) {
1563 LDLM_ERROR(lock, "no LVB");
1567 memcpy(data, lvb, size);
1568 } else if (size == sizeof(struct ost_lvb_v1)) {
1569 struct ost_lvb *olvb = data;
1571 if (loc == RCL_CLIENT)
1572 lvb = req_capsule_client_swab_get(pill,
1574 lustre_swab_ost_lvb_v1);
1576 lvb = req_capsule_server_sized_swab_get(pill,
1578 lustre_swab_ost_lvb_v1);
1579 if (unlikely(lvb == NULL)) {
1580 LDLM_ERROR(lock, "no LVB");
1584 memcpy(data, lvb, size);
1585 olvb->lvb_mtime_ns = 0;
1586 olvb->lvb_atime_ns = 0;
1587 olvb->lvb_ctime_ns = 0;
1589 LDLM_ERROR(lock, "Replied unexpected ost LVB size %d",
1595 if (size == sizeof(struct lquota_lvb)) {
1596 if (loc == RCL_CLIENT)
1597 lvb = req_capsule_client_swab_get(pill,
1599 lustre_swab_lquota_lvb);
1601 lvb = req_capsule_server_swab_get(pill,
1603 lustre_swab_lquota_lvb);
1604 if (unlikely(lvb == NULL)) {
1605 LDLM_ERROR(lock, "no LVB");
1609 memcpy(data, lvb, size);
1611 LDLM_ERROR(lock, "Replied unexpected lquota LVB size %d",
1620 if (loc == RCL_CLIENT)
1621 lvb = req_capsule_client_get(pill, &RMF_DLM_LVB);
1623 lvb = req_capsule_server_get(pill, &RMF_DLM_LVB);
1624 if (unlikely(lvb == NULL)) {
1625 LDLM_ERROR(lock, "no LVB");
1629 memcpy(data, lvb, size);
1632 LDLM_ERROR(lock, "Unknown LVB type: %d", lock->l_lvb_type);
1633 libcfs_debug_dumpstack(NULL);
1641 * Create and fill in new LDLM lock with specified properties.
1642 * Returns a referenced lock
1644 struct ldlm_lock *ldlm_lock_create(struct ldlm_namespace *ns,
1645 const struct ldlm_res_id *res_id,
1646 enum ldlm_type type,
1647 enum ldlm_mode mode,
1648 const struct ldlm_callback_suite *cbs,
1649 void *data, __u32 lvb_len,
1650 enum lvb_type lvb_type)
1652 struct ldlm_lock *lock;
1653 struct ldlm_resource *res;
1657 res = ldlm_resource_get(ns, NULL, res_id, type, 1);
1659 RETURN(ERR_CAST(res));
1661 lock = ldlm_lock_new(res);
1663 RETURN(ERR_PTR(-ENOMEM));
1665 lock->l_req_mode = mode;
1666 lock->l_ast_data = data;
1667 lock->l_pid = current_pid();
1668 if (ns_is_server(ns))
1669 ldlm_set_ns_srv(lock);
1671 lock->l_blocking_ast = cbs->lcs_blocking;
1672 lock->l_completion_ast = cbs->lcs_completion;
1673 lock->l_glimpse_ast = cbs->lcs_glimpse;
1676 lock->l_tree_node = NULL;
1677 /* if this is the extent lock, allocate the interval tree node */
1678 if (type == LDLM_EXTENT)
1679 if (ldlm_interval_alloc(lock) == NULL)
1680 GOTO(out, rc = -ENOMEM);
1683 lock->l_lvb_len = lvb_len;
1684 OBD_ALLOC_LARGE(lock->l_lvb_data, lvb_len);
1685 if (lock->l_lvb_data == NULL)
1686 GOTO(out, rc = -ENOMEM);
1689 lock->l_lvb_type = lvb_type;
1690 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_NEW_LOCK))
1691 GOTO(out, rc = -ENOENT);
1696 ldlm_lock_destroy(lock);
1697 LDLM_LOCK_RELEASE(lock);
1698 RETURN(ERR_PTR(rc));
1702 * Enqueue (request) a lock.
1704 * Does not block. As a result of enqueue the lock would be put
1705 * into granted or waiting list.
1707 * If namespace has intent policy sent and the lock has LDLM_FL_HAS_INTENT flag
1708 * set, skip all the enqueueing and delegate lock processing to intent policy
1711 enum ldlm_error ldlm_lock_enqueue(struct ldlm_namespace *ns,
1712 struct ldlm_lock **lockp,
1713 void *cookie, __u64 *flags)
1715 struct ldlm_lock *lock = *lockp;
1716 struct ldlm_resource *res = lock->l_resource;
1717 int local = ns_is_client(ldlm_res_to_ns(res));
1718 #ifdef HAVE_SERVER_SUPPORT
1719 ldlm_processing_policy policy;
1721 enum ldlm_error rc = ELDLM_OK;
1722 struct ldlm_interval *node = NULL;
1725 /* policies are not executed on the client or during replay */
1726 if ((*flags & (LDLM_FL_HAS_INTENT|LDLM_FL_REPLAY)) == LDLM_FL_HAS_INTENT
1727 && !local && ns->ns_policy) {
1728 rc = ns->ns_policy(ns, lockp, cookie, lock->l_req_mode, *flags,
1730 if (rc == ELDLM_LOCK_REPLACED) {
1731 /* The lock that was returned has already been granted,
1732 * and placed into lockp. If it's not the same as the
1733 * one we passed in, then destroy the old one and our
1734 * work here is done. */
1735 if (lock != *lockp) {
1736 ldlm_lock_destroy(lock);
1737 LDLM_LOCK_RELEASE(lock);
1739 *flags |= LDLM_FL_LOCK_CHANGED;
1741 } else if (rc != ELDLM_OK &&
1742 lock->l_req_mode == lock->l_granted_mode) {
1743 LASSERT(*flags & LDLM_FL_RESENT);
1744 /* It may happen that ns_policy returns an error in
1745 * resend case, object may be unlinked or just some
1746 * error occurs. It is unclear if lock reached the
1747 * client in the original reply, just leave the lock on
1748 * server, not returning it again to client. Due to
1749 * LU-6529, the server will not OOM. */
1751 } else if (rc != ELDLM_OK ||
1752 (rc == ELDLM_OK && (*flags & LDLM_FL_INTENT_ONLY))) {
1753 ldlm_lock_destroy(lock);
1758 if (*flags & LDLM_FL_RESENT) {
1759 /* Reconstruct LDLM_FL_SRV_ENQ_MASK @flags for reply.
1760 * Set LOCK_CHANGED always.
1761 * Check if the lock is granted for BLOCK_GRANTED.
1762 * Take NO_TIMEOUT from the lock as it is inherited through
1763 * LDLM_FL_INHERIT_MASK */
1764 *flags |= LDLM_FL_LOCK_CHANGED;
1765 if (lock->l_req_mode != lock->l_granted_mode)
1766 *flags |= LDLM_FL_BLOCK_GRANTED;
1767 *flags |= lock->l_flags & LDLM_FL_NO_TIMEOUT;
1771 /* For a replaying lock, it might be already in granted list. So
1772 * unlinking the lock will cause the interval node to be freed, we
1773 * have to allocate the interval node early otherwise we can't regrant
1774 * this lock in the future. - jay */
1775 if (!local && (*flags & LDLM_FL_REPLAY) && res->lr_type == LDLM_EXTENT)
1776 OBD_SLAB_ALLOC_PTR_GFP(node, ldlm_interval_slab, GFP_NOFS);
1778 lock_res_and_lock(lock);
1779 if (local && lock->l_req_mode == lock->l_granted_mode) {
1780 /* The server returned a blocked lock, but it was granted
1781 * before we got a chance to actually enqueue it. We don't
1782 * need to do anything else. */
1783 *flags &= ~LDLM_FL_BLOCKED_MASK;
1784 GOTO(out, rc = ELDLM_OK);
1787 ldlm_resource_unlink_lock(lock);
1788 if (res->lr_type == LDLM_EXTENT && lock->l_tree_node == NULL) {
1790 ldlm_lock_destroy_nolock(lock);
1791 GOTO(out, rc = -ENOMEM);
1794 INIT_LIST_HEAD(&node->li_group);
1795 ldlm_interval_attach(node, lock);
1799 /* Some flags from the enqueue want to make it into the AST, via the
1800 * lock's l_flags. */
1801 if (*flags & LDLM_FL_AST_DISCARD_DATA)
1802 ldlm_set_ast_discard_data(lock);
1803 if (*flags & LDLM_FL_TEST_LOCK)
1804 ldlm_set_test_lock(lock);
1805 if (*flags & LDLM_FL_COS_INCOMPAT)
1806 ldlm_set_cos_incompat(lock);
1807 if (*flags & LDLM_FL_COS_ENABLED)
1808 ldlm_set_cos_enabled(lock);
1810 /* This distinction between local lock trees is very important; a client
1811 * namespace only has information about locks taken by that client, and
1812 * thus doesn't have enough information to decide for itself if it can
1813 * be granted (below). In this case, we do exactly what the server
1814 * tells us to do, as dictated by the 'flags'.
1816 * We do exactly the same thing during recovery, when the server is
1817 * more or less trusting the clients not to lie.
1819 * FIXME (bug 268): Detect obvious lies by checking compatibility in
1820 * granted/converting queues. */
1822 if (*flags & LDLM_FL_BLOCK_CONV)
1823 ldlm_resource_add_lock(res, &res->lr_converting, lock);
1824 else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
1825 ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1827 ldlm_grant_lock(lock, NULL);
1828 GOTO(out, rc = ELDLM_OK);
1829 #ifdef HAVE_SERVER_SUPPORT
1830 } else if (*flags & LDLM_FL_REPLAY) {
1831 if (*flags & LDLM_FL_BLOCK_CONV) {
1832 ldlm_resource_add_lock(res, &res->lr_converting, lock);
1833 GOTO(out, rc = ELDLM_OK);
1834 } else if (*flags & LDLM_FL_BLOCK_WAIT) {
1835 ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1836 GOTO(out, rc = ELDLM_OK);
1837 } else if (*flags & LDLM_FL_BLOCK_GRANTED) {
1838 ldlm_grant_lock(lock, NULL);
1839 GOTO(out, rc = ELDLM_OK);
1841 /* If no flags, fall through to normal enqueue path. */
1844 policy = ldlm_processing_policy_table[res->lr_type];
1845 policy(lock, flags, 1, &rc, NULL);
1849 CERROR("This is client-side-only module, cannot handle "
1850 "LDLM_NAMESPACE_SERVER resource type lock.\n");
1856 unlock_res_and_lock(lock);
1858 OBD_SLAB_FREE(node, ldlm_interval_slab, sizeof(*node));
1862 #ifdef HAVE_SERVER_SUPPORT
1864 * Iterate through all waiting locks on a given resource queue and attempt to
1867 * Must be called with resource lock held.
1869 int ldlm_reprocess_queue(struct ldlm_resource *res, struct list_head *queue,
1870 struct list_head *work_list)
1872 struct list_head *tmp, *pos;
1873 ldlm_processing_policy policy;
1875 int rc = LDLM_ITER_CONTINUE;
1876 enum ldlm_error err;
1879 check_res_locked(res);
1881 policy = ldlm_processing_policy_table[res->lr_type];
1884 list_for_each_safe(tmp, pos, queue) {
1885 struct ldlm_lock *pending;
1887 pending = list_entry(tmp, struct ldlm_lock, l_res_link);
1889 CDEBUG(D_INFO, "Reprocessing lock %p\n", pending);
1892 rc = policy(pending, &flags, 0, &err, work_list);
1893 if (rc != LDLM_ITER_CONTINUE)
1902 * Process a call to blocking AST callback for a lock in ast_work list
1905 ldlm_work_bl_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
1907 struct ldlm_cb_set_arg *arg = opaq;
1908 struct ldlm_lock_desc d;
1910 struct ldlm_lock *lock;
1913 if (list_empty(arg->list))
1916 lock = list_entry(arg->list->next, struct ldlm_lock, l_bl_ast);
1918 /* nobody should touch l_bl_ast */
1919 lock_res_and_lock(lock);
1920 list_del_init(&lock->l_bl_ast);
1922 LASSERT(ldlm_is_ast_sent(lock));
1923 LASSERT(lock->l_bl_ast_run == 0);
1924 LASSERT(lock->l_blocking_lock);
1925 lock->l_bl_ast_run++;
1926 unlock_res_and_lock(lock);
1928 ldlm_lock2desc(lock->l_blocking_lock, &d);
1930 rc = lock->l_blocking_ast(lock, &d, (void *)arg, LDLM_CB_BLOCKING);
1931 LDLM_LOCK_RELEASE(lock->l_blocking_lock);
1932 lock->l_blocking_lock = NULL;
1933 LDLM_LOCK_RELEASE(lock);
1939 * Process a call to completion AST callback for a lock in ast_work list
1942 ldlm_work_cp_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
1944 struct ldlm_cb_set_arg *arg = opaq;
1946 struct ldlm_lock *lock;
1947 ldlm_completion_callback completion_callback;
1950 if (list_empty(arg->list))
1953 lock = list_entry(arg->list->next, struct ldlm_lock, l_cp_ast);
1955 /* It's possible to receive a completion AST before we've set
1956 * the l_completion_ast pointer: either because the AST arrived
1957 * before the reply, or simply because there's a small race
1958 * window between receiving the reply and finishing the local
1959 * enqueue. (bug 842)
1961 * This can't happen with the blocking_ast, however, because we
1962 * will never call the local blocking_ast until we drop our
1963 * reader/writer reference, which we won't do until we get the
1964 * reply and finish enqueueing. */
1966 /* nobody should touch l_cp_ast */
1967 lock_res_and_lock(lock);
1968 list_del_init(&lock->l_cp_ast);
1969 LASSERT(ldlm_is_cp_reqd(lock));
1970 /* save l_completion_ast since it can be changed by
1971 * mds_intent_policy(), see bug 14225 */
1972 completion_callback = lock->l_completion_ast;
1973 ldlm_clear_cp_reqd(lock);
1974 unlock_res_and_lock(lock);
1976 if (completion_callback != NULL)
1977 rc = completion_callback(lock, 0, (void *)arg);
1978 LDLM_LOCK_RELEASE(lock);
1984 * Process a call to revocation AST callback for a lock in ast_work list
1987 ldlm_work_revoke_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
1989 struct ldlm_cb_set_arg *arg = opaq;
1990 struct ldlm_lock_desc desc;
1992 struct ldlm_lock *lock;
1995 if (list_empty(arg->list))
1998 lock = list_entry(arg->list->next, struct ldlm_lock, l_rk_ast);
1999 list_del_init(&lock->l_rk_ast);
2001 /* the desc just pretend to exclusive */
2002 ldlm_lock2desc(lock, &desc);
2003 desc.l_req_mode = LCK_EX;
2004 desc.l_granted_mode = 0;
2006 rc = lock->l_blocking_ast(lock, &desc, (void*)arg, LDLM_CB_BLOCKING);
2007 LDLM_LOCK_RELEASE(lock);
2013 * Process a call to glimpse AST callback for a lock in ast_work list
2015 int ldlm_work_gl_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
2017 struct ldlm_cb_set_arg *arg = opaq;
2018 struct ldlm_glimpse_work *gl_work;
2019 struct ldlm_lock *lock;
2023 if (list_empty(arg->list))
2026 gl_work = list_entry(arg->list->next, struct ldlm_glimpse_work,
2028 list_del_init(&gl_work->gl_list);
2030 lock = gl_work->gl_lock;
2032 /* transfer the glimpse descriptor to ldlm_cb_set_arg */
2033 arg->gl_desc = gl_work->gl_desc;
2035 /* invoke the actual glimpse callback */
2036 if (lock->l_glimpse_ast(lock, (void*)arg) == 0)
2039 LDLM_LOCK_RELEASE(lock);
2041 if ((gl_work->gl_flags & LDLM_GL_WORK_NOFREE) == 0)
2042 OBD_FREE_PTR(gl_work);
2048 * Process list of locks in need of ASTs being sent.
2050 * Used on server to send multiple ASTs together instead of sending one by
2053 int ldlm_run_ast_work(struct ldlm_namespace *ns, struct list_head *rpc_list,
2054 ldlm_desc_ast_t ast_type)
2056 struct ldlm_cb_set_arg *arg;
2057 set_producer_func work_ast_lock;
2060 if (list_empty(rpc_list))
2067 atomic_set(&arg->restart, 0);
2068 arg->list = rpc_list;
2071 case LDLM_WORK_BL_AST:
2072 arg->type = LDLM_BL_CALLBACK;
2073 work_ast_lock = ldlm_work_bl_ast_lock;
2075 case LDLM_WORK_CP_AST:
2076 arg->type = LDLM_CP_CALLBACK;
2077 work_ast_lock = ldlm_work_cp_ast_lock;
2079 case LDLM_WORK_REVOKE_AST:
2080 arg->type = LDLM_BL_CALLBACK;
2081 work_ast_lock = ldlm_work_revoke_ast_lock;
2083 case LDLM_WORK_GL_AST:
2084 arg->type = LDLM_GL_CALLBACK;
2085 work_ast_lock = ldlm_work_gl_ast_lock;
2091 /* We create a ptlrpc request set with flow control extension.
2092 * This request set will use the work_ast_lock function to produce new
2093 * requests and will send a new request each time one completes in order
2094 * to keep the number of requests in flight to ns_max_parallel_ast */
2095 arg->set = ptlrpc_prep_fcset(ns->ns_max_parallel_ast ? : UINT_MAX,
2096 work_ast_lock, arg);
2097 if (arg->set == NULL)
2098 GOTO(out, rc = -ENOMEM);
2100 ptlrpc_set_wait(arg->set);
2101 ptlrpc_set_destroy(arg->set);
2103 rc = atomic_read(&arg->restart) ? -ERESTART : 0;
2110 static int reprocess_one_queue(struct ldlm_resource *res, void *closure)
2112 ldlm_reprocess_all(res);
2113 return LDLM_ITER_CONTINUE;
2116 static int ldlm_reprocess_res(struct cfs_hash *hs, struct cfs_hash_bd *bd,
2117 struct hlist_node *hnode, void *arg)
2119 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
2122 rc = reprocess_one_queue(res, arg);
2124 return rc == LDLM_ITER_STOP;
2128 * Iterate through all resources on a namespace attempting to grant waiting
2131 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns)
2136 cfs_hash_for_each_nolock(ns->ns_rs_hash,
2137 ldlm_reprocess_res, NULL, 0);
2143 * Try to grant all waiting locks on a resource.
2145 * Calls ldlm_reprocess_queue on converting and waiting queues.
2147 * Typically called after some resource locks are cancelled to see
2148 * if anything could be granted as a result of the cancellation.
2150 void ldlm_reprocess_all(struct ldlm_resource *res)
2152 struct list_head rpc_list;
2153 #ifdef HAVE_SERVER_SUPPORT
2157 INIT_LIST_HEAD(&rpc_list);
2158 /* Local lock trees don't get reprocessed. */
2159 if (ns_is_client(ldlm_res_to_ns(res))) {
2166 rc = ldlm_reprocess_queue(res, &res->lr_converting, &rpc_list);
2167 if (rc == LDLM_ITER_CONTINUE)
2168 ldlm_reprocess_queue(res, &res->lr_waiting, &rpc_list);
2171 rc = ldlm_run_ast_work(ldlm_res_to_ns(res), &rpc_list,
2173 if (rc == -ERESTART) {
2174 LASSERT(list_empty(&rpc_list));
2180 INIT_LIST_HEAD(&rpc_list);
2181 if (!ns_is_client(ldlm_res_to_ns(res))) {
2182 CERROR("This is client-side-only module, cannot handle "
2183 "LDLM_NAMESPACE_SERVER resource type lock.\n");
2189 EXPORT_SYMBOL(ldlm_reprocess_all);
2191 static bool is_bl_done(struct ldlm_lock *lock)
2193 bool bl_done = true;
2195 if (!ldlm_is_bl_done(lock)) {
2196 lock_res_and_lock(lock);
2197 bl_done = ldlm_is_bl_done(lock);
2198 unlock_res_and_lock(lock);
2205 * Helper function to call blocking AST for LDLM lock \a lock in a
2206 * "cancelling" mode.
2208 void ldlm_cancel_callback(struct ldlm_lock *lock)
2210 check_res_locked(lock->l_resource);
2211 if (!ldlm_is_cancel(lock)) {
2212 ldlm_set_cancel(lock);
2213 if (lock->l_blocking_ast) {
2214 unlock_res_and_lock(lock);
2215 lock->l_blocking_ast(lock, NULL, lock->l_ast_data,
2217 lock_res_and_lock(lock);
2219 LDLM_DEBUG(lock, "no blocking ast");
2222 /* only canceller can set bl_done bit */
2223 ldlm_set_bl_done(lock);
2224 wake_up_all(&lock->l_waitq);
2225 } else if (!ldlm_is_bl_done(lock)) {
2226 struct l_wait_info lwi = { 0 };
2228 /* The lock is guaranteed to have been canceled once
2229 * returning from this function. */
2230 unlock_res_and_lock(lock);
2231 l_wait_event(lock->l_waitq, is_bl_done(lock), &lwi);
2232 lock_res_and_lock(lock);
2237 * Remove skiplist-enabled LDLM lock \a req from granted list
2239 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req)
2241 if (req->l_resource->lr_type != LDLM_PLAIN &&
2242 req->l_resource->lr_type != LDLM_IBITS)
2245 list_del_init(&req->l_sl_policy);
2246 list_del_init(&req->l_sl_mode);
2250 * Attempts to cancel LDLM lock \a lock that has no reader/writer references.
2252 void ldlm_lock_cancel(struct ldlm_lock *lock)
2254 struct ldlm_resource *res;
2255 struct ldlm_namespace *ns;
2258 lock_res_and_lock(lock);
2260 res = lock->l_resource;
2261 ns = ldlm_res_to_ns(res);
2263 /* Please do not, no matter how tempting, remove this LBUG without
2264 * talking to me first. -phik */
2265 if (lock->l_readers || lock->l_writers) {
2266 LDLM_ERROR(lock, "lock still has references");
2270 if (ldlm_is_waited(lock))
2271 ldlm_del_waiting_lock(lock);
2273 /* Releases cancel callback. */
2274 ldlm_cancel_callback(lock);
2276 LASSERT(!ldlm_is_waited(lock));
2278 ldlm_resource_unlink_lock(lock);
2279 ldlm_lock_destroy_nolock(lock);
2281 if (lock->l_granted_mode == lock->l_req_mode)
2282 ldlm_pool_del(&ns->ns_pool, lock);
2284 /* Make sure we will not be called again for same lock what is possible
2285 * if not to zero out lock->l_granted_mode */
2286 lock->l_granted_mode = LCK_MINMODE;
2287 unlock_res_and_lock(lock);
2291 EXPORT_SYMBOL(ldlm_lock_cancel);
2294 * Set opaque data into the lock that only makes sense to upper layer.
2296 int ldlm_lock_set_data(const struct lustre_handle *lockh, void *data)
2298 struct ldlm_lock *lock = ldlm_handle2lock(lockh);
2303 if (lock->l_ast_data == NULL)
2304 lock->l_ast_data = data;
2305 if (lock->l_ast_data == data)
2307 LDLM_LOCK_PUT(lock);
2311 EXPORT_SYMBOL(ldlm_lock_set_data);
2313 struct export_cl_data {
2314 struct obd_export *ecl_exp;
2318 static void ldlm_cancel_lock_for_export(struct obd_export *exp,
2319 struct ldlm_lock *lock,
2320 struct export_cl_data *ecl)
2322 struct ldlm_resource *res;
2324 res = ldlm_resource_getref(lock->l_resource);
2326 ldlm_res_lvbo_update(res, NULL, 1);
2327 ldlm_lock_cancel(lock);
2328 if (!exp->exp_obd->obd_stopping)
2329 ldlm_reprocess_all(res);
2330 ldlm_resource_putref(res);
2333 if ((ecl->ecl_loop & -ecl->ecl_loop) == ecl->ecl_loop) {
2334 CDEBUG(D_INFO, "Export %p, %d locks cancelled.\n",
2335 exp, ecl->ecl_loop);
2340 * Iterator function for ldlm_export_cancel_locks.
2341 * Cancels passed locks.
2344 ldlm_cancel_locks_for_export_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
2345 struct hlist_node *hnode, void *data)
2348 struct export_cl_data *ecl = (struct export_cl_data *)data;
2349 struct obd_export *exp = ecl->ecl_exp;
2350 struct ldlm_lock *lock = cfs_hash_object(hs, hnode);
2352 LDLM_LOCK_GET(lock);
2353 ldlm_cancel_lock_for_export(exp, lock, ecl);
2354 LDLM_LOCK_RELEASE(lock);
2360 * Cancel all blocked locks for given export.
2362 * Typically called on client disconnection/eviction
2364 int ldlm_export_cancel_blocked_locks(struct obd_export *exp)
2366 struct export_cl_data ecl = {
2371 while (!list_empty(&exp->exp_bl_list)) {
2372 struct ldlm_lock *lock;
2374 spin_lock_bh(&exp->exp_bl_list_lock);
2375 if (!list_empty(&exp->exp_bl_list)) {
2376 lock = list_entry(exp->exp_bl_list.next,
2377 struct ldlm_lock, l_exp_list);
2378 LDLM_LOCK_GET(lock);
2379 list_del_init(&lock->l_exp_list);
2383 spin_unlock_bh(&exp->exp_bl_list_lock);
2388 ldlm_cancel_lock_for_export(exp, lock, &ecl);
2389 LDLM_LOCK_RELEASE(lock);
2392 CDEBUG(D_DLMTRACE, "Export %p, canceled %d locks, "
2393 "left on hash table %d.\n", exp, ecl.ecl_loop,
2394 atomic_read(&exp->exp_lock_hash->hs_count));
2396 return ecl.ecl_loop;
2400 * Cancel all locks for given export.
2402 * Typically called after client disconnection/eviction
2404 int ldlm_export_cancel_locks(struct obd_export *exp)
2406 struct export_cl_data ecl = {
2411 cfs_hash_for_each_empty(exp->exp_lock_hash,
2412 ldlm_cancel_locks_for_export_cb, &ecl);
2414 CDEBUG(D_DLMTRACE, "Export %p, canceled %d locks, "
2415 "left on hash table %d.\n", exp, ecl.ecl_loop,
2416 atomic_read(&exp->exp_lock_hash->hs_count));
2418 return ecl.ecl_loop;
2422 * Downgrade an exclusive lock.
2424 * A fast variant of ldlm_lock_convert for convertion of exclusive
2425 * locks. The convertion is always successful.
2426 * Used by Commit on Sharing (COS) code.
2428 * \param lock A lock to convert
2429 * \param new_mode new lock mode
2431 void ldlm_lock_downgrade(struct ldlm_lock *lock, enum ldlm_mode new_mode)
2435 LASSERT(lock->l_granted_mode & (LCK_PW | LCK_EX));
2436 LASSERT(new_mode == LCK_COS);
2438 lock_res_and_lock(lock);
2439 ldlm_resource_unlink_lock(lock);
2441 * Remove the lock from pool as it will be added again in
2442 * ldlm_grant_lock() called below.
2444 ldlm_pool_del(&ldlm_lock_to_ns(lock)->ns_pool, lock);
2446 lock->l_req_mode = new_mode;
2447 ldlm_grant_lock(lock, NULL);
2448 unlock_res_and_lock(lock);
2449 ldlm_reprocess_all(lock->l_resource);
2453 EXPORT_SYMBOL(ldlm_lock_downgrade);
2456 * Attempt to convert already granted lock to a different mode.
2458 * While lock conversion is not currently used, future client-side
2459 * optimizations could take advantage of it to avoid discarding cached
2462 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock,
2463 enum ldlm_mode new_mode, __u32 *flags)
2465 struct list_head rpc_list;
2466 struct ldlm_resource *res;
2467 struct ldlm_namespace *ns;
2469 #ifdef HAVE_SERVER_SUPPORT
2471 struct sl_insert_point prev;
2473 struct ldlm_interval *node;
2476 INIT_LIST_HEAD(&rpc_list);
2477 /* Just return if mode is unchanged. */
2478 if (new_mode == lock->l_granted_mode) {
2479 *flags |= LDLM_FL_BLOCK_GRANTED;
2480 RETURN(lock->l_resource);
2483 /* I can't check the type of lock here because the bitlock of lock
2484 * is not held here, so do the allocation blindly. -jay */
2485 OBD_SLAB_ALLOC_PTR_GFP(node, ldlm_interval_slab, GFP_NOFS);
2486 if (node == NULL) /* Actually, this causes EDEADLOCK to be returned */
2489 LASSERTF((new_mode == LCK_PW && lock->l_granted_mode == LCK_PR),
2490 "new_mode %u, granted %u\n", new_mode, lock->l_granted_mode);
2492 lock_res_and_lock(lock);
2494 res = lock->l_resource;
2495 ns = ldlm_res_to_ns(res);
2497 #ifdef HAVE_SERVER_SUPPORT
2498 old_mode = lock->l_req_mode;
2500 lock->l_req_mode = new_mode;
2501 if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS) {
2502 #ifdef HAVE_SERVER_SUPPORT
2503 /* remember the lock position where the lock might be
2504 * added back to the granted list later and also
2505 * remember the join mode for skiplist fixing. */
2506 prev.res_link = lock->l_res_link.prev;
2507 prev.mode_link = lock->l_sl_mode.prev;
2508 prev.policy_link = lock->l_sl_policy.prev;
2510 ldlm_resource_unlink_lock(lock);
2512 ldlm_resource_unlink_lock(lock);
2513 if (res->lr_type == LDLM_EXTENT) {
2514 /* FIXME: ugly code, I have to attach the lock to a
2515 * interval node again since perhaps it will be granted
2517 INIT_LIST_HEAD(&node->li_group);
2518 ldlm_interval_attach(node, lock);
2524 * Remove old lock from the pool before adding the lock with new
2525 * mode below in ->policy()
2527 ldlm_pool_del(&ns->ns_pool, lock);
2529 /* If this is a local resource, put it on the appropriate list. */
2530 if (ns_is_client(ldlm_res_to_ns(res))) {
2531 if (*flags & (LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_GRANTED)) {
2532 ldlm_resource_add_lock(res, &res->lr_converting, lock);
2534 /* This should never happen, because of the way the
2535 * server handles conversions. */
2536 LDLM_ERROR(lock, "Erroneous flags %x on local lock\n",
2540 ldlm_grant_lock(lock, &rpc_list);
2542 /* FIXME: completion handling not with lr_lock held ! */
2543 if (lock->l_completion_ast)
2544 lock->l_completion_ast(lock, 0, NULL);
2546 #ifdef HAVE_SERVER_SUPPORT
2549 enum ldlm_error err;
2551 ldlm_processing_policy policy;
2553 policy = ldlm_processing_policy_table[res->lr_type];
2554 rc = policy(lock, &pflags, 0, &err, &rpc_list);
2555 if (rc == LDLM_ITER_STOP) {
2556 lock->l_req_mode = old_mode;
2557 if (res->lr_type == LDLM_EXTENT)
2558 ldlm_extent_add_lock(res, lock);
2560 ldlm_granted_list_add_lock(lock, &prev);
2564 *flags |= LDLM_FL_BLOCK_GRANTED;
2570 CERROR("This is client-side-only module, cannot handle "
2571 "LDLM_NAMESPACE_SERVER resource type lock.\n");
2575 unlock_res_and_lock(lock);
2578 ldlm_run_ast_work(ns, &rpc_list, LDLM_WORK_CP_AST);
2580 OBD_SLAB_FREE(node, ldlm_interval_slab, sizeof(*node));
2585 * Print lock with lock handle \a lockh description into debug log.
2587 * Used when printing all locks on a resource for debug purposes.
2589 void ldlm_lock_dump_handle(int level, const struct lustre_handle *lockh)
2591 struct ldlm_lock *lock;
2593 if (!((libcfs_debug | D_ERROR) & level))
2596 lock = ldlm_handle2lock(lockh);
2600 LDLM_DEBUG_LIMIT(level, lock, "###");
2602 LDLM_LOCK_PUT(lock);
2604 EXPORT_SYMBOL(ldlm_lock_dump_handle);
2607 * Print lock information with custom message into debug log.
2610 void _ldlm_lock_debug(struct ldlm_lock *lock,
2611 struct libcfs_debug_msg_data *msgdata,
2612 const char *fmt, ...)
2615 struct obd_export *exp = lock->l_export;
2616 struct ldlm_resource *resource = lock->l_resource;
2617 char *nid = "local";
2619 va_start(args, fmt);
2621 if (exp && exp->exp_connection) {
2622 nid = libcfs_nid2str(exp->exp_connection->c_peer.nid);
2623 } else if (exp && exp->exp_obd != NULL) {
2624 struct obd_import *imp = exp->exp_obd->u.cli.cl_import;
2625 nid = libcfs_nid2str(imp->imp_connection->c_peer.nid);
2628 if (resource == NULL) {
2629 libcfs_debug_vmsg2(msgdata, fmt, args,
2630 " ns: \?\? lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2631 "res: \?\? rrc=\?\? type: \?\?\? flags: "LPX64" nid: %s "
2632 "remote: "LPX64" expref: %d pid: %u timeout: %lu "
2635 lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
2636 lock->l_readers, lock->l_writers,
2637 ldlm_lockname[lock->l_granted_mode],
2638 ldlm_lockname[lock->l_req_mode],
2639 lock->l_flags, nid, lock->l_remote_handle.cookie,
2640 exp ? atomic_read(&exp->exp_refcount) : -99,
2641 lock->l_pid, lock->l_callback_timeout, lock->l_lvb_type);
2646 switch (resource->lr_type) {
2648 libcfs_debug_vmsg2(msgdata, fmt, args,
2649 " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2650 "res: "DLDLMRES" rrc: %d type: %s ["LPU64"->"LPU64"] "
2651 "(req "LPU64"->"LPU64") flags: "LPX64" nid: %s remote: "
2652 LPX64" expref: %d pid: %u timeout: %lu lvb_type: %d\n",
2653 ldlm_lock_to_ns_name(lock), lock,
2654 lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
2655 lock->l_readers, lock->l_writers,
2656 ldlm_lockname[lock->l_granted_mode],
2657 ldlm_lockname[lock->l_req_mode],
2659 atomic_read(&resource->lr_refcount),
2660 ldlm_typename[resource->lr_type],
2661 lock->l_policy_data.l_extent.start,
2662 lock->l_policy_data.l_extent.end,
2663 lock->l_req_extent.start, lock->l_req_extent.end,
2664 lock->l_flags, nid, lock->l_remote_handle.cookie,
2665 exp ? atomic_read(&exp->exp_refcount) : -99,
2666 lock->l_pid, lock->l_callback_timeout,
2671 libcfs_debug_vmsg2(msgdata, fmt, args,
2672 " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2673 "res: "DLDLMRES" rrc: %d type: %s pid: %d "
2674 "["LPU64"->"LPU64"] flags: "LPX64" nid: %s "
2675 "remote: "LPX64" expref: %d pid: %u timeout: %lu\n",
2676 ldlm_lock_to_ns_name(lock), lock,
2677 lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
2678 lock->l_readers, lock->l_writers,
2679 ldlm_lockname[lock->l_granted_mode],
2680 ldlm_lockname[lock->l_req_mode],
2682 atomic_read(&resource->lr_refcount),
2683 ldlm_typename[resource->lr_type],
2684 lock->l_policy_data.l_flock.pid,
2685 lock->l_policy_data.l_flock.start,
2686 lock->l_policy_data.l_flock.end,
2687 lock->l_flags, nid, lock->l_remote_handle.cookie,
2688 exp ? atomic_read(&exp->exp_refcount) : -99,
2689 lock->l_pid, lock->l_callback_timeout);
2693 libcfs_debug_vmsg2(msgdata, fmt, args,
2694 " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2695 "res: "DLDLMRES" bits "LPX64" rrc: %d type: %s "
2696 "flags: "LPX64" nid: %s remote: "LPX64" expref: %d "
2697 "pid: %u timeout: %lu lvb_type: %d\n",
2698 ldlm_lock_to_ns_name(lock),
2699 lock, lock->l_handle.h_cookie,
2700 atomic_read(&lock->l_refc),
2701 lock->l_readers, lock->l_writers,
2702 ldlm_lockname[lock->l_granted_mode],
2703 ldlm_lockname[lock->l_req_mode],
2705 lock->l_policy_data.l_inodebits.bits,
2706 atomic_read(&resource->lr_refcount),
2707 ldlm_typename[resource->lr_type],
2708 lock->l_flags, nid, lock->l_remote_handle.cookie,
2709 exp ? atomic_read(&exp->exp_refcount) : -99,
2710 lock->l_pid, lock->l_callback_timeout,
2715 libcfs_debug_vmsg2(msgdata, fmt, args,
2716 " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2717 "res: "DLDLMRES" rrc: %d type: %s flags: "LPX64" "
2718 "nid: %s remote: "LPX64" expref: %d pid: %u "
2719 "timeout: %lu lvb_type: %d\n",
2720 ldlm_lock_to_ns_name(lock),
2721 lock, lock->l_handle.h_cookie,
2722 atomic_read(&lock->l_refc),
2723 lock->l_readers, lock->l_writers,
2724 ldlm_lockname[lock->l_granted_mode],
2725 ldlm_lockname[lock->l_req_mode],
2727 atomic_read(&resource->lr_refcount),
2728 ldlm_typename[resource->lr_type],
2729 lock->l_flags, nid, lock->l_remote_handle.cookie,
2730 exp ? atomic_read(&exp->exp_refcount) : -99,
2731 lock->l_pid, lock->l_callback_timeout,
2737 EXPORT_SYMBOL(_ldlm_lock_debug);