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, 2013, 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
45 # include <libcfs/libcfs.h>
46 # include <linux/lustre_intent.h>
48 # include <liblustre.h>
51 #include <obd_class.h>
52 #include "ldlm_internal.h"
55 char *ldlm_lockname[] = {
63 [LCK_GROUP] = "GROUP",
66 EXPORT_SYMBOL(ldlm_lockname);
68 char *ldlm_typename[] = {
70 [LDLM_EXTENT] = "EXT",
74 EXPORT_SYMBOL(ldlm_typename);
76 static ldlm_policy_wire_to_local_t ldlm_policy_wire18_to_local[] = {
77 [LDLM_PLAIN - LDLM_MIN_TYPE] = ldlm_plain_policy_wire_to_local,
78 [LDLM_EXTENT - LDLM_MIN_TYPE] = ldlm_extent_policy_wire_to_local,
79 [LDLM_FLOCK - LDLM_MIN_TYPE] = ldlm_flock_policy_wire18_to_local,
80 [LDLM_IBITS - LDLM_MIN_TYPE] = ldlm_ibits_policy_wire_to_local,
83 static ldlm_policy_wire_to_local_t ldlm_policy_wire21_to_local[] = {
84 [LDLM_PLAIN - LDLM_MIN_TYPE] = ldlm_plain_policy_wire_to_local,
85 [LDLM_EXTENT - LDLM_MIN_TYPE] = ldlm_extent_policy_wire_to_local,
86 [LDLM_FLOCK - LDLM_MIN_TYPE] = ldlm_flock_policy_wire21_to_local,
87 [LDLM_IBITS - LDLM_MIN_TYPE] = ldlm_ibits_policy_wire_to_local,
90 static ldlm_policy_local_to_wire_t ldlm_policy_local_to_wire[] = {
91 [LDLM_PLAIN - LDLM_MIN_TYPE] = ldlm_plain_policy_local_to_wire,
92 [LDLM_EXTENT - LDLM_MIN_TYPE] = ldlm_extent_policy_local_to_wire,
93 [LDLM_FLOCK - LDLM_MIN_TYPE] = ldlm_flock_policy_local_to_wire,
94 [LDLM_IBITS - LDLM_MIN_TYPE] = ldlm_ibits_policy_local_to_wire,
98 * Converts lock policy from local format to on the wire lock_desc format
100 void ldlm_convert_policy_to_wire(ldlm_type_t type,
101 const ldlm_policy_data_t *lpolicy,
102 ldlm_wire_policy_data_t *wpolicy)
104 ldlm_policy_local_to_wire_t convert;
106 convert = ldlm_policy_local_to_wire[type - LDLM_MIN_TYPE];
108 convert(lpolicy, wpolicy);
112 * Converts lock policy from on the wire lock_desc format to local format
114 void ldlm_convert_policy_to_local(struct obd_export *exp, ldlm_type_t type,
115 const ldlm_wire_policy_data_t *wpolicy,
116 ldlm_policy_data_t *lpolicy)
118 ldlm_policy_wire_to_local_t convert;
121 /** some badness for 2.0.0 clients, but 2.0.0 isn't supported */
122 new_client = (exp_connect_flags(exp) & OBD_CONNECT_FULL20) != 0;
124 convert = ldlm_policy_wire21_to_local[type - LDLM_MIN_TYPE];
126 convert = ldlm_policy_wire18_to_local[type - LDLM_MIN_TYPE];
128 convert(wpolicy, lpolicy);
131 char *ldlm_it2str(int it)
138 case (IT_OPEN | IT_CREAT):
153 CERROR("Unknown intent %d\n", it);
157 EXPORT_SYMBOL(ldlm_it2str);
159 extern struct kmem_cache *ldlm_lock_slab;
161 #ifdef HAVE_SERVER_SUPPORT
162 static ldlm_processing_policy ldlm_processing_policy_table[] = {
163 [LDLM_PLAIN] = ldlm_process_plain_lock,
164 [LDLM_EXTENT] = ldlm_process_extent_lock,
166 [LDLM_FLOCK] = ldlm_process_flock_lock,
168 [LDLM_IBITS] = ldlm_process_inodebits_lock,
171 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res)
173 return ldlm_processing_policy_table[res->lr_type];
175 EXPORT_SYMBOL(ldlm_get_processing_policy);
176 #endif /* HAVE_SERVER_SUPPORT */
178 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg)
182 EXPORT_SYMBOL(ldlm_register_intent);
185 * REFCOUNTED LOCK OBJECTS
190 * Get a reference on a lock.
192 * Lock refcounts, during creation:
193 * - one special one for allocation, dec'd only once in destroy
194 * - one for being a lock that's in-use
195 * - one for the addref associated with a new lock
197 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock)
199 atomic_inc(&lock->l_refc);
202 EXPORT_SYMBOL(ldlm_lock_get);
205 * Release lock reference.
207 * Also frees the lock if it was last reference.
209 void ldlm_lock_put(struct ldlm_lock *lock)
213 LASSERT(lock->l_resource != LP_POISON);
214 LASSERT(atomic_read(&lock->l_refc) > 0);
215 if (atomic_dec_and_test(&lock->l_refc)) {
216 struct ldlm_resource *res;
219 "final lock_put on destroyed lock, freeing it.");
221 res = lock->l_resource;
222 LASSERT(ldlm_is_destroyed(lock));
223 LASSERT(cfs_list_empty(&lock->l_res_link));
224 LASSERT(cfs_list_empty(&lock->l_pending_chain));
226 lprocfs_counter_decr(ldlm_res_to_ns(res)->ns_stats,
228 lu_ref_del(&res->lr_reference, "lock", lock);
229 ldlm_resource_putref(res);
230 lock->l_resource = NULL;
231 if (lock->l_export) {
232 class_export_lock_put(lock->l_export, lock);
233 lock->l_export = NULL;
236 if (lock->l_lvb_data != NULL)
237 OBD_FREE_LARGE(lock->l_lvb_data, lock->l_lvb_len);
239 ldlm_interval_free(ldlm_interval_detach(lock));
240 lu_ref_fini(&lock->l_reference);
241 OBD_FREE_RCU(lock, sizeof(*lock), &lock->l_handle);
246 EXPORT_SYMBOL(ldlm_lock_put);
249 * Removes LDLM lock \a lock from LRU. Assumes LRU is already locked.
251 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock)
254 if (!cfs_list_empty(&lock->l_lru)) {
255 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
257 LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
258 cfs_list_del_init(&lock->l_lru);
259 LASSERT(ns->ns_nr_unused > 0);
267 * Removes LDLM lock \a lock from LRU. Obtains the LRU lock first.
269 int ldlm_lock_remove_from_lru(struct ldlm_lock *lock)
271 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
275 if (ldlm_is_ns_srv(lock)) {
276 LASSERT(cfs_list_empty(&lock->l_lru));
280 spin_lock(&ns->ns_lock);
281 rc = ldlm_lock_remove_from_lru_nolock(lock);
282 spin_unlock(&ns->ns_lock);
288 * Adds LDLM lock \a lock to namespace LRU. Assumes LRU is already locked.
290 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock)
292 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
294 lock->l_last_used = cfs_time_current();
295 LASSERT(cfs_list_empty(&lock->l_lru));
296 LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
297 cfs_list_add_tail(&lock->l_lru, &ns->ns_unused_list);
298 ldlm_clear_skipped(lock);
299 LASSERT(ns->ns_nr_unused >= 0);
304 * Adds LDLM lock \a lock to namespace LRU. Obtains necessary LRU locks
307 void ldlm_lock_add_to_lru(struct ldlm_lock *lock)
309 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
312 spin_lock(&ns->ns_lock);
313 ldlm_lock_add_to_lru_nolock(lock);
314 spin_unlock(&ns->ns_lock);
319 * Moves LDLM lock \a lock that is already in namespace LRU to the tail of
320 * the LRU. Performs necessary LRU locking
322 void ldlm_lock_touch_in_lru(struct ldlm_lock *lock)
324 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
327 if (ldlm_is_ns_srv(lock)) {
328 LASSERT(cfs_list_empty(&lock->l_lru));
333 spin_lock(&ns->ns_lock);
334 if (!cfs_list_empty(&lock->l_lru)) {
335 ldlm_lock_remove_from_lru_nolock(lock);
336 ldlm_lock_add_to_lru_nolock(lock);
338 spin_unlock(&ns->ns_lock);
343 * Helper to destroy a locked lock.
345 * Used by ldlm_lock_destroy and ldlm_lock_destroy_nolock
346 * Must be called with l_lock and lr_lock held.
348 * Does not actually free the lock data, but rather marks the lock as
349 * destroyed by setting l_destroyed field in the lock to 1. Destroys a
350 * handle->lock association too, so that the lock can no longer be found
351 * and removes the lock from LRU list. Actual lock freeing occurs when
352 * last lock reference goes away.
354 * Original comment (of some historical value):
355 * This used to have a 'strict' flag, which recovery would use to mark an
356 * in-use lock as needing-to-die. Lest I am ever tempted to put it back, I
357 * shall explain why it's gone: with the new hash table scheme, once you call
358 * ldlm_lock_destroy, you can never drop your final references on this lock.
359 * Because it's not in the hash table anymore. -phil
361 int ldlm_lock_destroy_internal(struct ldlm_lock *lock)
365 if (lock->l_readers || lock->l_writers) {
366 LDLM_ERROR(lock, "lock still has references");
370 if (!cfs_list_empty(&lock->l_res_link)) {
371 LDLM_ERROR(lock, "lock still on resource");
375 if (ldlm_is_destroyed(lock)) {
376 LASSERT(cfs_list_empty(&lock->l_lru));
380 ldlm_set_destroyed(lock);
382 if (lock->l_export && lock->l_export->exp_lock_hash) {
383 /* NB: it's safe to call cfs_hash_del() even lock isn't
384 * in exp_lock_hash. */
385 /* In the function below, .hs_keycmp resolves to
386 * ldlm_export_lock_keycmp() */
387 /* coverity[overrun-buffer-val] */
388 cfs_hash_del(lock->l_export->exp_lock_hash,
389 &lock->l_remote_handle, &lock->l_exp_hash);
392 ldlm_lock_remove_from_lru(lock);
393 class_handle_unhash(&lock->l_handle);
396 /* Wake anyone waiting for this lock */
397 /* FIXME: I should probably add yet another flag, instead of using
398 * l_export to only call this on clients */
400 class_export_put(lock->l_export);
401 lock->l_export = NULL;
402 if (lock->l_export && lock->l_completion_ast)
403 lock->l_completion_ast(lock, 0);
410 * Destroys a LDLM lock \a lock. Performs necessary locking first.
412 void ldlm_lock_destroy(struct ldlm_lock *lock)
416 lock_res_and_lock(lock);
417 first = ldlm_lock_destroy_internal(lock);
418 unlock_res_and_lock(lock);
420 /* drop reference from hashtable only for first destroy */
422 lu_ref_del(&lock->l_reference, "hash", lock);
423 LDLM_LOCK_RELEASE(lock);
429 * Destroys a LDLM lock \a lock that is already locked.
431 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock)
435 first = ldlm_lock_destroy_internal(lock);
436 /* drop reference from hashtable only for first destroy */
438 lu_ref_del(&lock->l_reference, "hash", lock);
439 LDLM_LOCK_RELEASE(lock);
444 /* this is called by portals_handle2object with the handle lock taken */
445 static void lock_handle_addref(void *lock)
447 LDLM_LOCK_GET((struct ldlm_lock *)lock);
450 static void lock_handle_free(void *lock, int size)
452 LASSERT(size == sizeof(struct ldlm_lock));
453 OBD_SLAB_FREE(lock, ldlm_lock_slab, size);
456 struct portals_handle_ops lock_handle_ops = {
457 .hop_addref = lock_handle_addref,
458 .hop_free = lock_handle_free,
463 * Allocate and initialize new lock structure.
465 * usage: pass in a resource on which you have done ldlm_resource_get
466 * new lock will take over the refcount.
467 * returns: lock with refcount 2 - one for current caller and one for remote
469 static struct ldlm_lock *ldlm_lock_new(struct ldlm_resource *resource)
471 struct ldlm_lock *lock;
474 if (resource == NULL)
477 OBD_SLAB_ALLOC_PTR_GFP(lock, ldlm_lock_slab, GFP_NOFS);
481 spin_lock_init(&lock->l_lock);
482 lock->l_resource = resource;
483 lu_ref_add(&resource->lr_reference, "lock", lock);
485 atomic_set(&lock->l_refc, 2);
486 CFS_INIT_LIST_HEAD(&lock->l_res_link);
487 CFS_INIT_LIST_HEAD(&lock->l_lru);
488 CFS_INIT_LIST_HEAD(&lock->l_pending_chain);
489 CFS_INIT_LIST_HEAD(&lock->l_bl_ast);
490 CFS_INIT_LIST_HEAD(&lock->l_cp_ast);
491 CFS_INIT_LIST_HEAD(&lock->l_rk_ast);
492 init_waitqueue_head(&lock->l_waitq);
493 lock->l_blocking_lock = NULL;
494 CFS_INIT_LIST_HEAD(&lock->l_sl_mode);
495 CFS_INIT_LIST_HEAD(&lock->l_sl_policy);
496 CFS_INIT_HLIST_NODE(&lock->l_exp_hash);
497 CFS_INIT_HLIST_NODE(&lock->l_exp_flock_hash);
499 lprocfs_counter_incr(ldlm_res_to_ns(resource)->ns_stats,
501 CFS_INIT_LIST_HEAD(&lock->l_handle.h_link);
502 class_handle_hash(&lock->l_handle, &lock_handle_ops);
504 lu_ref_init(&lock->l_reference);
505 lu_ref_add(&lock->l_reference, "hash", lock);
506 lock->l_callback_timeout = 0;
508 #if LUSTRE_TRACKS_LOCK_EXP_REFS
509 CFS_INIT_LIST_HEAD(&lock->l_exp_refs_link);
510 lock->l_exp_refs_nr = 0;
511 lock->l_exp_refs_target = NULL;
513 CFS_INIT_LIST_HEAD(&lock->l_exp_list);
519 * Moves LDLM lock \a lock to another resource.
520 * This is used on client when server returns some other lock than requested
521 * (typically as a result of intent operation)
523 int ldlm_lock_change_resource(struct ldlm_namespace *ns, struct ldlm_lock *lock,
524 const struct ldlm_res_id *new_resid)
526 struct ldlm_resource *oldres = lock->l_resource;
527 struct ldlm_resource *newres;
531 LASSERT(ns_is_client(ns));
533 lock_res_and_lock(lock);
534 if (memcmp(new_resid, &lock->l_resource->lr_name,
535 sizeof(lock->l_resource->lr_name)) == 0) {
537 unlock_res_and_lock(lock);
541 LASSERT(new_resid->name[0] != 0);
543 /* This function assumes that the lock isn't on any lists */
544 LASSERT(cfs_list_empty(&lock->l_res_link));
546 type = oldres->lr_type;
547 unlock_res_and_lock(lock);
549 newres = ldlm_resource_get(ns, NULL, new_resid, type, 1);
551 RETURN(PTR_ERR(newres));
553 lu_ref_add(&newres->lr_reference, "lock", lock);
555 * To flip the lock from the old to the new resource, lock, oldres and
556 * newres have to be locked. Resource spin-locks are nested within
557 * lock->l_lock, and are taken in the memory address order to avoid
560 spin_lock(&lock->l_lock);
561 oldres = lock->l_resource;
562 if (oldres < newres) {
564 lock_res_nested(newres, LRT_NEW);
567 lock_res_nested(oldres, LRT_NEW);
569 LASSERT(memcmp(new_resid, &oldres->lr_name,
570 sizeof oldres->lr_name) != 0);
571 lock->l_resource = newres;
573 unlock_res_and_lock(lock);
575 /* ...and the flowers are still standing! */
576 lu_ref_del(&oldres->lr_reference, "lock", lock);
577 ldlm_resource_putref(oldres);
581 EXPORT_SYMBOL(ldlm_lock_change_resource);
583 /** \defgroup ldlm_handles LDLM HANDLES
584 * Ways to get hold of locks without any addresses.
589 * Fills in handle for LDLM lock \a lock into supplied \a lockh
590 * Does not take any references.
592 void ldlm_lock2handle(const struct ldlm_lock *lock, struct lustre_handle *lockh)
594 lockh->cookie = lock->l_handle.h_cookie;
596 EXPORT_SYMBOL(ldlm_lock2handle);
599 * Obtain a lock reference by handle.
601 * if \a flags: atomically get the lock and set the flags.
602 * Return NULL if flag already set
604 struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *handle,
607 struct ldlm_lock *lock;
612 lock = class_handle2object(handle->cookie, NULL);
616 /* It's unlikely but possible that someone marked the lock as
617 * destroyed after we did handle2object on it */
618 if ((flags == 0) && !ldlm_is_destroyed(lock)) {
619 lu_ref_add(&lock->l_reference, "handle", current);
623 lock_res_and_lock(lock);
625 LASSERT(lock->l_resource != NULL);
627 lu_ref_add_atomic(&lock->l_reference, "handle", current);
628 if (unlikely(ldlm_is_destroyed(lock))) {
629 unlock_res_and_lock(lock);
630 CDEBUG(D_INFO, "lock already destroyed: lock %p\n", lock);
635 /* If we're setting flags, make sure none of them are already set. */
637 if ((lock->l_flags & flags) != 0) {
638 unlock_res_and_lock(lock);
643 lock->l_flags |= flags;
646 unlock_res_and_lock(lock);
649 EXPORT_SYMBOL(__ldlm_handle2lock);
650 /** @} ldlm_handles */
653 * Fill in "on the wire" representation for given LDLM lock into supplied
654 * lock descriptor \a desc structure.
656 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc)
658 ldlm_res2desc(lock->l_resource, &desc->l_resource);
659 desc->l_req_mode = lock->l_req_mode;
660 desc->l_granted_mode = lock->l_granted_mode;
661 ldlm_convert_policy_to_wire(lock->l_resource->lr_type,
662 &lock->l_policy_data,
663 &desc->l_policy_data);
665 EXPORT_SYMBOL(ldlm_lock2desc);
668 * Add a lock to list of conflicting locks to send AST to.
670 * Only add if we have not sent a blocking AST to the lock yet.
672 void ldlm_add_bl_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
673 cfs_list_t *work_list)
675 if (!ldlm_is_ast_sent(lock)) {
676 LDLM_DEBUG(lock, "lock incompatible; sending blocking AST.");
677 ldlm_set_ast_sent(lock);
678 /* If the enqueuing client said so, tell the AST recipient to
679 * discard dirty data, rather than writing back. */
680 if (ldlm_is_ast_discard_data(new))
681 ldlm_set_discard_data(lock);
682 LASSERT(cfs_list_empty(&lock->l_bl_ast));
683 cfs_list_add(&lock->l_bl_ast, work_list);
685 LASSERT(lock->l_blocking_lock == NULL);
686 lock->l_blocking_lock = LDLM_LOCK_GET(new);
691 * Add a lock to list of just granted locks to send completion AST to.
693 void ldlm_add_cp_work_item(struct ldlm_lock *lock, cfs_list_t *work_list)
695 if (!ldlm_is_cp_reqd(lock)) {
696 ldlm_set_cp_reqd(lock);
697 LDLM_DEBUG(lock, "lock granted; sending completion AST.");
698 LASSERT(cfs_list_empty(&lock->l_cp_ast));
699 cfs_list_add(&lock->l_cp_ast, work_list);
705 * Aggregator function to add AST work items into a list. Determines
706 * what sort of an AST work needs to be done and calls the proper
708 * Must be called with lr_lock held.
710 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
711 cfs_list_t *work_list)
714 check_res_locked(lock->l_resource);
716 ldlm_add_bl_work_item(lock, new, work_list);
718 ldlm_add_cp_work_item(lock, work_list);
723 * Add specified reader/writer reference to LDLM lock with handle \a lockh.
724 * r/w reference type is determined by \a mode
725 * Calls ldlm_lock_addref_internal.
727 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode)
729 struct ldlm_lock *lock;
731 lock = ldlm_handle2lock(lockh);
732 LASSERT(lock != NULL);
733 ldlm_lock_addref_internal(lock, mode);
736 EXPORT_SYMBOL(ldlm_lock_addref);
740 * Add specified reader/writer reference to LDLM lock \a lock.
741 * r/w reference type is determined by \a mode
742 * Removes lock from LRU if it is there.
743 * Assumes the LDLM lock is already locked.
745 void ldlm_lock_addref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
747 ldlm_lock_remove_from_lru(lock);
748 if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
750 lu_ref_add_atomic(&lock->l_reference, "reader", lock);
752 if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP | LCK_COS)) {
754 lu_ref_add_atomic(&lock->l_reference, "writer", lock);
757 lu_ref_add_atomic(&lock->l_reference, "user", lock);
758 LDLM_DEBUG(lock, "ldlm_lock_addref(%s)", ldlm_lockname[mode]);
762 * Attempts to add reader/writer reference to a lock with handle \a lockh, and
763 * fails if lock is already LDLM_FL_CBPENDING or destroyed.
765 * \retval 0 success, lock was addref-ed
767 * \retval -EAGAIN lock is being canceled.
769 int ldlm_lock_addref_try(struct lustre_handle *lockh, __u32 mode)
771 struct ldlm_lock *lock;
775 lock = ldlm_handle2lock(lockh);
777 lock_res_and_lock(lock);
778 if (lock->l_readers != 0 || lock->l_writers != 0 ||
779 !ldlm_is_cbpending(lock)) {
780 ldlm_lock_addref_internal_nolock(lock, mode);
783 unlock_res_and_lock(lock);
788 EXPORT_SYMBOL(ldlm_lock_addref_try);
791 * Add specified reader/writer reference to LDLM lock \a lock.
792 * Locks LDLM lock and calls ldlm_lock_addref_internal_nolock to do the work.
793 * Only called for local locks.
795 void ldlm_lock_addref_internal(struct ldlm_lock *lock, __u32 mode)
797 lock_res_and_lock(lock);
798 ldlm_lock_addref_internal_nolock(lock, mode);
799 unlock_res_and_lock(lock);
803 * Removes reader/writer reference for LDLM lock \a lock.
804 * Assumes LDLM lock is already locked.
805 * only called in ldlm_flock_destroy and for local locks.
806 * Does NOT add lock to LRU if no r/w references left to accomodate flock locks
807 * that cannot be placed in LRU.
809 void ldlm_lock_decref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
811 LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
812 if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
813 LASSERT(lock->l_readers > 0);
814 lu_ref_del(&lock->l_reference, "reader", lock);
817 if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP | LCK_COS)) {
818 LASSERT(lock->l_writers > 0);
819 lu_ref_del(&lock->l_reference, "writer", lock);
823 lu_ref_del(&lock->l_reference, "user", lock);
824 LDLM_LOCK_RELEASE(lock); /* matches the LDLM_LOCK_GET() in addref */
828 * Removes reader/writer reference for LDLM lock \a lock.
829 * Locks LDLM lock first.
830 * If the lock is determined to be client lock on a client and r/w refcount
831 * drops to zero and the lock is not blocked, the lock is added to LRU lock
833 * For blocked LDLM locks if r/w count drops to zero, blocking_ast is called.
835 void ldlm_lock_decref_internal(struct ldlm_lock *lock, __u32 mode)
837 struct ldlm_namespace *ns;
840 lock_res_and_lock(lock);
842 ns = ldlm_lock_to_ns(lock);
844 ldlm_lock_decref_internal_nolock(lock, mode);
846 if (ldlm_is_local(lock) &&
847 !lock->l_readers && !lock->l_writers) {
848 /* If this is a local lock on a server namespace and this was
849 * the last reference, cancel the lock. */
850 CDEBUG(D_INFO, "forcing cancel of local lock\n");
851 ldlm_set_cbpending(lock);
854 if (!lock->l_readers && !lock->l_writers &&
855 ldlm_is_cbpending(lock)) {
856 /* If we received a blocked AST and this was the last reference,
857 * run the callback. */
858 if (ldlm_is_ns_srv(lock) && lock->l_export)
859 CERROR("FL_CBPENDING set on non-local lock--just a "
862 LDLM_DEBUG(lock, "final decref done on cbpending lock");
864 LDLM_LOCK_GET(lock); /* dropped by bl thread */
865 ldlm_lock_remove_from_lru(lock);
866 unlock_res_and_lock(lock);
868 if (ldlm_is_fail_loc(lock))
869 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
871 if (ldlm_is_atomic_cb(lock) ||
872 ldlm_bl_to_thread_lock(ns, NULL, lock) != 0)
873 ldlm_handle_bl_callback(ns, NULL, lock);
874 } else if (ns_is_client(ns) &&
875 !lock->l_readers && !lock->l_writers &&
876 !ldlm_is_no_lru(lock) &&
877 !ldlm_is_bl_ast(lock)) {
879 LDLM_DEBUG(lock, "add lock into lru list");
881 /* If this is a client-side namespace and this was the last
882 * reference, put it on the LRU. */
883 ldlm_lock_add_to_lru(lock);
884 unlock_res_and_lock(lock);
886 if (ldlm_is_fail_loc(lock))
887 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
889 /* Call ldlm_cancel_lru() only if EARLY_CANCEL and LRU RESIZE
890 * are not supported by the server, otherwise, it is done on
892 if (!exp_connect_cancelset(lock->l_conn_export) &&
893 !ns_connect_lru_resize(ns))
894 ldlm_cancel_lru(ns, 0, LCF_ASYNC, 0);
896 LDLM_DEBUG(lock, "do not add lock into lru list");
897 unlock_res_and_lock(lock);
904 * Decrease reader/writer refcount for LDLM lock with handle \a lockh
906 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode)
908 struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
909 LASSERTF(lock != NULL, "Non-existing lock: "LPX64"\n", lockh->cookie);
910 ldlm_lock_decref_internal(lock, mode);
913 EXPORT_SYMBOL(ldlm_lock_decref);
916 * Decrease reader/writer refcount for LDLM lock with handle
917 * \a lockh and mark it for subsequent cancellation once r/w refcount
918 * drops to zero instead of putting into LRU.
920 * Typical usage is for GROUP locks which we cannot allow to be cached.
922 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode)
924 struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
927 LASSERT(lock != NULL);
929 LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
930 lock_res_and_lock(lock);
931 ldlm_set_cbpending(lock);
932 unlock_res_and_lock(lock);
933 ldlm_lock_decref_internal(lock, mode);
936 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
938 struct sl_insert_point {
939 cfs_list_t *res_link;
940 cfs_list_t *mode_link;
941 cfs_list_t *policy_link;
945 * Finds a position to insert the new lock into granted lock list.
947 * Used for locks eligible for skiplist optimization.
950 * queue [input]: the granted list where search acts on;
951 * req [input]: the lock whose position to be located;
952 * prev [output]: positions within 3 lists to insert @req to
956 * - ldlm_grant_lock_with_skiplist
958 static void search_granted_lock(cfs_list_t *queue,
959 struct ldlm_lock *req,
960 struct sl_insert_point *prev)
963 struct ldlm_lock *lock, *mode_end, *policy_end;
966 cfs_list_for_each(tmp, queue) {
967 lock = cfs_list_entry(tmp, struct ldlm_lock, l_res_link);
969 mode_end = cfs_list_entry(lock->l_sl_mode.prev,
970 struct ldlm_lock, l_sl_mode);
972 if (lock->l_req_mode != req->l_req_mode) {
973 /* jump to last lock of mode group */
974 tmp = &mode_end->l_res_link;
978 /* suitable mode group is found */
979 if (lock->l_resource->lr_type == LDLM_PLAIN) {
980 /* insert point is last lock of the mode group */
981 prev->res_link = &mode_end->l_res_link;
982 prev->mode_link = &mode_end->l_sl_mode;
983 prev->policy_link = &req->l_sl_policy;
986 } else if (lock->l_resource->lr_type == LDLM_IBITS) {
989 cfs_list_entry(lock->l_sl_policy.prev,
993 if (lock->l_policy_data.l_inodebits.bits ==
994 req->l_policy_data.l_inodebits.bits) {
995 /* insert point is last lock of
996 * the policy group */
998 &policy_end->l_res_link;
1000 &policy_end->l_sl_mode;
1002 &policy_end->l_sl_policy;
1007 if (policy_end == mode_end)
1008 /* done with mode group */
1011 /* go to next policy group within mode group */
1012 tmp = policy_end->l_res_link.next;
1013 lock = cfs_list_entry(tmp, struct ldlm_lock,
1015 } /* loop over policy groups within the mode group */
1017 /* insert point is last lock of the mode group,
1018 * new policy group is started */
1019 prev->res_link = &mode_end->l_res_link;
1020 prev->mode_link = &mode_end->l_sl_mode;
1021 prev->policy_link = &req->l_sl_policy;
1025 LDLM_ERROR(lock,"is not LDLM_PLAIN or LDLM_IBITS lock");
1030 /* insert point is last lock on the queue,
1031 * new mode group and new policy group are started */
1032 prev->res_link = queue->prev;
1033 prev->mode_link = &req->l_sl_mode;
1034 prev->policy_link = &req->l_sl_policy;
1040 * Add a lock into resource granted list after a position described by
1043 static void ldlm_granted_list_add_lock(struct ldlm_lock *lock,
1044 struct sl_insert_point *prev)
1046 struct ldlm_resource *res = lock->l_resource;
1049 check_res_locked(res);
1051 ldlm_resource_dump(D_INFO, res);
1052 LDLM_DEBUG(lock, "About to add lock:");
1054 if (ldlm_is_destroyed(lock)) {
1055 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1059 LASSERT(cfs_list_empty(&lock->l_res_link));
1060 LASSERT(cfs_list_empty(&lock->l_sl_mode));
1061 LASSERT(cfs_list_empty(&lock->l_sl_policy));
1064 * lock->link == prev->link means lock is first starting the group.
1065 * Don't re-add to itself to suppress kernel warnings.
1067 if (&lock->l_res_link != prev->res_link)
1068 cfs_list_add(&lock->l_res_link, prev->res_link);
1069 if (&lock->l_sl_mode != prev->mode_link)
1070 cfs_list_add(&lock->l_sl_mode, prev->mode_link);
1071 if (&lock->l_sl_policy != prev->policy_link)
1072 cfs_list_add(&lock->l_sl_policy, prev->policy_link);
1078 * Add a lock to granted list on a resource maintaining skiplist
1081 static void ldlm_grant_lock_with_skiplist(struct ldlm_lock *lock)
1083 struct sl_insert_point prev;
1086 LASSERT(lock->l_req_mode == lock->l_granted_mode);
1088 search_granted_lock(&lock->l_resource->lr_granted, lock, &prev);
1089 ldlm_granted_list_add_lock(lock, &prev);
1094 * Perform lock granting bookkeeping.
1096 * Includes putting the lock into granted list and updating lock mode.
1098 * - ldlm_lock_enqueue
1099 * - ldlm_reprocess_queue
1100 * - ldlm_lock_convert
1102 * must be called with lr_lock held
1104 void ldlm_grant_lock(struct ldlm_lock *lock, cfs_list_t *work_list)
1106 struct ldlm_resource *res = lock->l_resource;
1109 check_res_locked(res);
1111 lock->l_granted_mode = lock->l_req_mode;
1113 if (work_list && lock->l_completion_ast != NULL)
1114 ldlm_add_ast_work_item(lock, NULL, work_list);
1116 /* We should not add locks to granted list in the following cases:
1117 * - this is an UNLOCK but not a real lock;
1118 * - this is a TEST lock;
1119 * - this is a F_CANCELLK lock (async flock has req_mode == 0)
1120 * - this is a deadlock (flock cannot be granted) */
1121 if (lock->l_req_mode == 0 ||
1122 lock->l_req_mode == LCK_NL ||
1123 ldlm_is_test_lock(lock) ||
1124 ldlm_is_flock_deadlock(lock))
1127 if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS)
1128 ldlm_grant_lock_with_skiplist(lock);
1129 else if (res->lr_type == LDLM_EXTENT)
1130 ldlm_extent_add_lock(res, lock);
1132 ldlm_resource_add_lock(res, &res->lr_granted, lock);
1134 if (lock->l_granted_mode < res->lr_most_restr)
1135 res->lr_most_restr = lock->l_granted_mode;
1137 ldlm_pool_add(&ldlm_res_to_ns(res)->ns_pool, lock);
1142 * Search for a lock with given properties in a queue.
1144 * \retval a referenced lock or NULL. See the flag descriptions below, in the
1145 * comment above ldlm_lock_match
1147 static struct ldlm_lock *search_queue(cfs_list_t *queue,
1149 ldlm_policy_data_t *policy,
1150 struct ldlm_lock *old_lock,
1151 __u64 flags, int unref)
1153 struct ldlm_lock *lock;
1156 cfs_list_for_each(tmp, queue) {
1159 lock = cfs_list_entry(tmp, struct ldlm_lock, l_res_link);
1161 if (lock == old_lock)
1164 /* Check if this lock can be matched.
1165 * Used by LU-2919(exclusive open) for open lease lock */
1166 if (ldlm_is_excl(lock))
1169 /* llite sometimes wants to match locks that will be
1170 * canceled when their users drop, but we allow it to match
1171 * if it passes in CBPENDING and the lock still has users.
1172 * this is generally only going to be used by children
1173 * whose parents already hold a lock so forward progress
1174 * can still happen. */
1175 if (ldlm_is_cbpending(lock) &&
1176 !(flags & LDLM_FL_CBPENDING))
1178 if (!unref && ldlm_is_cbpending(lock) &&
1179 lock->l_readers == 0 && lock->l_writers == 0)
1182 if (!(lock->l_req_mode & *mode))
1184 match = lock->l_req_mode;
1186 if (lock->l_resource->lr_type == LDLM_EXTENT &&
1187 (lock->l_policy_data.l_extent.start >
1188 policy->l_extent.start ||
1189 lock->l_policy_data.l_extent.end < policy->l_extent.end))
1192 if (unlikely(match == LCK_GROUP) &&
1193 lock->l_resource->lr_type == LDLM_EXTENT &&
1194 lock->l_policy_data.l_extent.gid != policy->l_extent.gid)
1197 /* We match if we have existing lock with same or wider set
1199 if (lock->l_resource->lr_type == LDLM_IBITS &&
1200 ((lock->l_policy_data.l_inodebits.bits &
1201 policy->l_inodebits.bits) !=
1202 policy->l_inodebits.bits))
1205 if (!unref && LDLM_HAVE_MASK(lock, GONE))
1208 if ((flags & LDLM_FL_LOCAL_ONLY) &&
1209 !ldlm_is_local(lock))
1212 if (flags & LDLM_FL_TEST_LOCK) {
1213 LDLM_LOCK_GET(lock);
1214 ldlm_lock_touch_in_lru(lock);
1216 ldlm_lock_addref_internal_nolock(lock, match);
1225 void ldlm_lock_fail_match_locked(struct ldlm_lock *lock)
1227 if ((lock->l_flags & LDLM_FL_FAIL_NOTIFIED) == 0) {
1228 lock->l_flags |= LDLM_FL_FAIL_NOTIFIED;
1229 wake_up_all(&lock->l_waitq);
1232 EXPORT_SYMBOL(ldlm_lock_fail_match_locked);
1234 void ldlm_lock_fail_match(struct ldlm_lock *lock)
1236 lock_res_and_lock(lock);
1237 ldlm_lock_fail_match_locked(lock);
1238 unlock_res_and_lock(lock);
1240 EXPORT_SYMBOL(ldlm_lock_fail_match);
1243 * Mark lock as "matchable" by OST.
1245 * Used to prevent certain races in LOV/OSC where the lock is granted, but LVB
1247 * Assumes LDLM lock is already locked.
1249 void ldlm_lock_allow_match_locked(struct ldlm_lock *lock)
1251 ldlm_set_lvb_ready(lock);
1252 wake_up_all(&lock->l_waitq);
1254 EXPORT_SYMBOL(ldlm_lock_allow_match_locked);
1257 * Mark lock as "matchable" by OST.
1258 * Locks the lock and then \see ldlm_lock_allow_match_locked
1260 void ldlm_lock_allow_match(struct ldlm_lock *lock)
1262 lock_res_and_lock(lock);
1263 ldlm_lock_allow_match_locked(lock);
1264 unlock_res_and_lock(lock);
1266 EXPORT_SYMBOL(ldlm_lock_allow_match);
1269 * Attempt to find a lock with specified properties.
1271 * Typically returns a reference to matched lock unless LDLM_FL_TEST_LOCK is
1274 * Can be called in two ways:
1276 * If 'ns' is NULL, then lockh describes an existing lock that we want to look
1277 * for a duplicate of.
1279 * Otherwise, all of the fields must be filled in, to match against.
1281 * If 'flags' contains LDLM_FL_LOCAL_ONLY, then only match local locks on the
1282 * server (ie, connh is NULL)
1283 * If 'flags' contains LDLM_FL_BLOCK_GRANTED, then only locks on the granted
1284 * list will be considered
1285 * If 'flags' contains LDLM_FL_CBPENDING, then locks that have been marked
1286 * to be canceled can still be matched as long as they still have reader
1287 * or writer refernces
1288 * If 'flags' contains LDLM_FL_TEST_LOCK, then don't actually reference a lock,
1289 * just tell us if we would have matched.
1291 * \retval 1 if it finds an already-existing lock that is compatible; in this
1292 * case, lockh is filled in with a addref()ed lock
1294 * We also check security context, and if that fails we simply return 0 (to
1295 * keep caller code unchanged), the context failure will be discovered by
1296 * caller sometime later.
1298 ldlm_mode_t ldlm_lock_match(struct ldlm_namespace *ns, __u64 flags,
1299 const struct ldlm_res_id *res_id, ldlm_type_t type,
1300 ldlm_policy_data_t *policy, ldlm_mode_t mode,
1301 struct lustre_handle *lockh, int unref)
1303 struct ldlm_resource *res;
1304 struct ldlm_lock *lock, *old_lock = NULL;
1309 old_lock = ldlm_handle2lock(lockh);
1312 ns = ldlm_lock_to_ns(old_lock);
1313 res_id = &old_lock->l_resource->lr_name;
1314 type = old_lock->l_resource->lr_type;
1315 mode = old_lock->l_req_mode;
1318 res = ldlm_resource_get(ns, NULL, res_id, type, 0);
1320 LASSERT(old_lock == NULL);
1324 LDLM_RESOURCE_ADDREF(res);
1327 lock = search_queue(&res->lr_granted, &mode, policy, old_lock,
1331 if (flags & LDLM_FL_BLOCK_GRANTED)
1333 lock = search_queue(&res->lr_converting, &mode, policy, old_lock,
1337 lock = search_queue(&res->lr_waiting, &mode, policy, old_lock,
1345 LDLM_RESOURCE_DELREF(res);
1346 ldlm_resource_putref(res);
1349 ldlm_lock2handle(lock, lockh);
1350 if ((flags & LDLM_FL_LVB_READY) &&
1351 (!ldlm_is_lvb_ready(lock))) {
1352 __u64 wait_flags = LDLM_FL_LVB_READY |
1353 LDLM_FL_DESTROYED | LDLM_FL_FAIL_NOTIFIED;
1354 struct l_wait_info lwi;
1355 if (lock->l_completion_ast) {
1356 int err = lock->l_completion_ast(lock,
1357 LDLM_FL_WAIT_NOREPROC,
1360 if (flags & LDLM_FL_TEST_LOCK)
1361 LDLM_LOCK_RELEASE(lock);
1363 ldlm_lock_decref_internal(lock,
1370 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout),
1371 NULL, LWI_ON_SIGNAL_NOOP, NULL);
1373 /* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
1374 l_wait_event(lock->l_waitq,
1375 lock->l_flags & wait_flags,
1377 if (!ldlm_is_lvb_ready(lock)) {
1378 if (flags & LDLM_FL_TEST_LOCK)
1379 LDLM_LOCK_RELEASE(lock);
1381 ldlm_lock_decref_internal(lock, mode);
1388 LDLM_DEBUG(lock, "matched ("LPU64" "LPU64")",
1389 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1390 res_id->name[2] : policy->l_extent.start,
1391 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1392 res_id->name[3] : policy->l_extent.end);
1394 /* check user's security context */
1395 if (lock->l_conn_export &&
1396 sptlrpc_import_check_ctx(
1397 class_exp2cliimp(lock->l_conn_export))) {
1398 if (!(flags & LDLM_FL_TEST_LOCK))
1399 ldlm_lock_decref_internal(lock, mode);
1403 if (flags & LDLM_FL_TEST_LOCK)
1404 LDLM_LOCK_RELEASE(lock);
1406 } else if (!(flags & LDLM_FL_TEST_LOCK)) {/*less verbose for test-only*/
1407 LDLM_DEBUG_NOLOCK("not matched ns %p type %u mode %u res "
1408 LPU64"/"LPU64" ("LPU64" "LPU64")", ns,
1409 type, mode, res_id->name[0], res_id->name[1],
1410 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1411 res_id->name[2] :policy->l_extent.start,
1412 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1413 res_id->name[3] : policy->l_extent.end);
1416 LDLM_LOCK_PUT(old_lock);
1418 return rc ? mode : 0;
1420 EXPORT_SYMBOL(ldlm_lock_match);
1422 ldlm_mode_t ldlm_revalidate_lock_handle(struct lustre_handle *lockh,
1425 struct ldlm_lock *lock;
1426 ldlm_mode_t mode = 0;
1429 lock = ldlm_handle2lock(lockh);
1431 lock_res_and_lock(lock);
1432 if (LDLM_HAVE_MASK(lock, GONE))
1435 if (ldlm_is_cbpending(lock) &&
1436 lock->l_readers == 0 && lock->l_writers == 0)
1440 *bits = lock->l_policy_data.l_inodebits.bits;
1441 mode = lock->l_granted_mode;
1442 ldlm_lock_addref_internal_nolock(lock, mode);
1449 unlock_res_and_lock(lock);
1450 LDLM_LOCK_PUT(lock);
1454 EXPORT_SYMBOL(ldlm_revalidate_lock_handle);
1456 /** The caller must guarantee that the buffer is large enough. */
1457 int ldlm_fill_lvb(struct ldlm_lock *lock, struct req_capsule *pill,
1458 enum req_location loc, void *data, int size)
1463 LASSERT(data != NULL);
1466 switch (lock->l_lvb_type) {
1468 if (size == sizeof(struct ost_lvb)) {
1469 if (loc == RCL_CLIENT)
1470 lvb = req_capsule_client_swab_get(pill,
1472 lustre_swab_ost_lvb);
1474 lvb = req_capsule_server_swab_get(pill,
1476 lustre_swab_ost_lvb);
1477 if (unlikely(lvb == NULL)) {
1478 LDLM_ERROR(lock, "no LVB");
1482 memcpy(data, lvb, size);
1483 } else if (size == sizeof(struct ost_lvb_v1)) {
1484 struct ost_lvb *olvb = data;
1486 if (loc == RCL_CLIENT)
1487 lvb = req_capsule_client_swab_get(pill,
1489 lustre_swab_ost_lvb_v1);
1491 lvb = req_capsule_server_sized_swab_get(pill,
1493 lustre_swab_ost_lvb_v1);
1494 if (unlikely(lvb == NULL)) {
1495 LDLM_ERROR(lock, "no LVB");
1499 memcpy(data, lvb, size);
1500 olvb->lvb_mtime_ns = 0;
1501 olvb->lvb_atime_ns = 0;
1502 olvb->lvb_ctime_ns = 0;
1504 LDLM_ERROR(lock, "Replied unexpected ost LVB size %d",
1510 if (size == sizeof(struct lquota_lvb)) {
1511 if (loc == RCL_CLIENT)
1512 lvb = req_capsule_client_swab_get(pill,
1514 lustre_swab_lquota_lvb);
1516 lvb = req_capsule_server_swab_get(pill,
1518 lustre_swab_lquota_lvb);
1519 if (unlikely(lvb == NULL)) {
1520 LDLM_ERROR(lock, "no LVB");
1524 memcpy(data, lvb, size);
1526 LDLM_ERROR(lock, "Replied unexpected lquota LVB size %d",
1535 if (loc == RCL_CLIENT)
1536 lvb = req_capsule_client_get(pill, &RMF_DLM_LVB);
1538 lvb = req_capsule_server_get(pill, &RMF_DLM_LVB);
1539 if (unlikely(lvb == NULL)) {
1540 LDLM_ERROR(lock, "no LVB");
1544 memcpy(data, lvb, size);
1547 LDLM_ERROR(lock, "Unknown LVB type: %d\n", lock->l_lvb_type);
1548 libcfs_debug_dumpstack(NULL);
1556 * Create and fill in new LDLM lock with specified properties.
1557 * Returns a referenced lock
1559 struct ldlm_lock *ldlm_lock_create(struct ldlm_namespace *ns,
1560 const struct ldlm_res_id *res_id,
1563 const struct ldlm_callback_suite *cbs,
1564 void *data, __u32 lvb_len,
1565 enum lvb_type lvb_type)
1567 struct ldlm_lock *lock;
1568 struct ldlm_resource *res;
1572 res = ldlm_resource_get(ns, NULL, res_id, type, 1);
1574 RETURN(ERR_CAST(res));
1576 lock = ldlm_lock_new(res);
1578 RETURN(ERR_PTR(-ENOMEM));
1580 lock->l_req_mode = mode;
1581 lock->l_ast_data = data;
1582 lock->l_pid = current_pid();
1583 if (ns_is_server(ns))
1584 ldlm_set_ns_srv(lock);
1586 lock->l_blocking_ast = cbs->lcs_blocking;
1587 lock->l_completion_ast = cbs->lcs_completion;
1588 lock->l_glimpse_ast = cbs->lcs_glimpse;
1591 lock->l_tree_node = NULL;
1592 /* if this is the extent lock, allocate the interval tree node */
1593 if (type == LDLM_EXTENT)
1594 if (ldlm_interval_alloc(lock) == NULL)
1595 GOTO(out, rc = -ENOMEM);
1598 lock->l_lvb_len = lvb_len;
1599 OBD_ALLOC_LARGE(lock->l_lvb_data, lvb_len);
1600 if (lock->l_lvb_data == NULL)
1601 GOTO(out, rc = -ENOMEM);
1604 lock->l_lvb_type = lvb_type;
1605 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_NEW_LOCK))
1606 GOTO(out, rc = -ENOENT);
1611 ldlm_lock_destroy(lock);
1612 LDLM_LOCK_RELEASE(lock);
1613 RETURN(ERR_PTR(rc));
1617 * Enqueue (request) a lock.
1619 * Does not block. As a result of enqueue the lock would be put
1620 * into granted or waiting list.
1622 * If namespace has intent policy sent and the lock has LDLM_FL_HAS_INTENT flag
1623 * set, skip all the enqueueing and delegate lock processing to intent policy
1626 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *ns,
1627 struct ldlm_lock **lockp,
1628 void *cookie, __u64 *flags)
1630 struct ldlm_lock *lock = *lockp;
1631 struct ldlm_resource *res = lock->l_resource;
1632 int local = ns_is_client(ldlm_res_to_ns(res));
1633 #ifdef HAVE_SERVER_SUPPORT
1634 ldlm_processing_policy policy;
1636 ldlm_error_t rc = ELDLM_OK;
1637 struct ldlm_interval *node = NULL;
1640 lock->l_last_activity = cfs_time_current_sec();
1641 /* policies are not executed on the client or during replay */
1642 if ((*flags & (LDLM_FL_HAS_INTENT|LDLM_FL_REPLAY)) == LDLM_FL_HAS_INTENT
1643 && !local && ns->ns_policy) {
1644 rc = ns->ns_policy(ns, lockp, cookie, lock->l_req_mode, *flags,
1646 if (rc == ELDLM_LOCK_REPLACED) {
1647 /* The lock that was returned has already been granted,
1648 * and placed into lockp. If it's not the same as the
1649 * one we passed in, then destroy the old one and our
1650 * work here is done. */
1651 if (lock != *lockp) {
1652 ldlm_lock_destroy(lock);
1653 LDLM_LOCK_RELEASE(lock);
1655 *flags |= LDLM_FL_LOCK_CHANGED;
1657 } else if (rc != ELDLM_OK ||
1658 (rc == ELDLM_OK && (*flags & LDLM_FL_INTENT_ONLY))) {
1659 ldlm_lock_destroy(lock);
1664 /* For a replaying lock, it might be already in granted list. So
1665 * unlinking the lock will cause the interval node to be freed, we
1666 * have to allocate the interval node early otherwise we can't regrant
1667 * this lock in the future. - jay */
1668 if (!local && (*flags & LDLM_FL_REPLAY) && res->lr_type == LDLM_EXTENT)
1669 OBD_SLAB_ALLOC_PTR_GFP(node, ldlm_interval_slab, GFP_NOFS);
1671 lock_res_and_lock(lock);
1672 if (local && lock->l_req_mode == lock->l_granted_mode) {
1673 /* The server returned a blocked lock, but it was granted
1674 * before we got a chance to actually enqueue it. We don't
1675 * need to do anything else. */
1676 *flags &= ~(LDLM_FL_BLOCK_GRANTED |
1677 LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_WAIT);
1678 GOTO(out, rc = ELDLM_OK);
1681 ldlm_resource_unlink_lock(lock);
1682 if (res->lr_type == LDLM_EXTENT && lock->l_tree_node == NULL) {
1684 ldlm_lock_destroy_nolock(lock);
1685 GOTO(out, rc = -ENOMEM);
1688 CFS_INIT_LIST_HEAD(&node->li_group);
1689 ldlm_interval_attach(node, lock);
1693 /* Some flags from the enqueue want to make it into the AST, via the
1694 * lock's l_flags. */
1695 if (*flags & LDLM_FL_AST_DISCARD_DATA)
1696 ldlm_set_ast_discard_data(lock);
1697 if (*flags & LDLM_FL_TEST_LOCK)
1698 ldlm_set_test_lock(lock);
1700 /* This distinction between local lock trees is very important; a client
1701 * namespace only has information about locks taken by that client, and
1702 * thus doesn't have enough information to decide for itself if it can
1703 * be granted (below). In this case, we do exactly what the server
1704 * tells us to do, as dictated by the 'flags'.
1706 * We do exactly the same thing during recovery, when the server is
1707 * more or less trusting the clients not to lie.
1709 * FIXME (bug 268): Detect obvious lies by checking compatibility in
1710 * granted/converting queues. */
1712 if (*flags & LDLM_FL_BLOCK_CONV)
1713 ldlm_resource_add_lock(res, &res->lr_converting, lock);
1714 else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
1715 ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1717 ldlm_grant_lock(lock, NULL);
1718 GOTO(out, rc = ELDLM_OK);
1719 #ifdef HAVE_SERVER_SUPPORT
1720 } else if (*flags & LDLM_FL_RESENT) {
1721 GOTO(out, rc = ELDLM_OK);
1722 } else if (*flags & LDLM_FL_REPLAY) {
1723 if (*flags & LDLM_FL_BLOCK_CONV) {
1724 ldlm_resource_add_lock(res, &res->lr_converting, lock);
1725 GOTO(out, rc = ELDLM_OK);
1726 } else if (*flags & LDLM_FL_BLOCK_WAIT) {
1727 ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1728 GOTO(out, rc = ELDLM_OK);
1729 } else if (*flags & LDLM_FL_BLOCK_GRANTED) {
1730 ldlm_grant_lock(lock, NULL);
1731 GOTO(out, rc = ELDLM_OK);
1733 /* If no flags, fall through to normal enqueue path. */
1736 policy = ldlm_processing_policy_table[res->lr_type];
1737 policy(lock, flags, 1, &rc, NULL);
1741 CERROR("This is client-side-only module, cannot handle "
1742 "LDLM_NAMESPACE_SERVER resource type lock.\n");
1748 unlock_res_and_lock(lock);
1750 OBD_SLAB_FREE(node, ldlm_interval_slab, sizeof(*node));
1754 #ifdef HAVE_SERVER_SUPPORT
1756 * Iterate through all waiting locks on a given resource queue and attempt to
1759 * Must be called with resource lock held.
1761 int ldlm_reprocess_queue(struct ldlm_resource *res, cfs_list_t *queue,
1762 cfs_list_t *work_list)
1764 cfs_list_t *tmp, *pos;
1765 ldlm_processing_policy policy;
1767 int rc = LDLM_ITER_CONTINUE;
1771 check_res_locked(res);
1773 policy = ldlm_processing_policy_table[res->lr_type];
1776 cfs_list_for_each_safe(tmp, pos, queue) {
1777 struct ldlm_lock *pending;
1778 pending = cfs_list_entry(tmp, struct ldlm_lock, l_res_link);
1780 CDEBUG(D_INFO, "Reprocessing lock %p\n", pending);
1783 rc = policy(pending, &flags, 0, &err, work_list);
1784 if (rc != LDLM_ITER_CONTINUE)
1793 * Process a call to blocking AST callback for a lock in ast_work list
1796 ldlm_work_bl_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
1798 struct ldlm_cb_set_arg *arg = opaq;
1799 struct ldlm_lock_desc d;
1801 struct ldlm_lock *lock;
1804 if (cfs_list_empty(arg->list))
1807 lock = cfs_list_entry(arg->list->next, struct ldlm_lock, l_bl_ast);
1809 /* nobody should touch l_bl_ast */
1810 lock_res_and_lock(lock);
1811 cfs_list_del_init(&lock->l_bl_ast);
1813 LASSERT(ldlm_is_ast_sent(lock));
1814 LASSERT(lock->l_bl_ast_run == 0);
1815 LASSERT(lock->l_blocking_lock);
1816 lock->l_bl_ast_run++;
1817 unlock_res_and_lock(lock);
1819 ldlm_lock2desc(lock->l_blocking_lock, &d);
1821 rc = lock->l_blocking_ast(lock, &d, (void *)arg, LDLM_CB_BLOCKING);
1822 LDLM_LOCK_RELEASE(lock->l_blocking_lock);
1823 lock->l_blocking_lock = NULL;
1824 LDLM_LOCK_RELEASE(lock);
1830 * Process a call to completion AST callback for a lock in ast_work list
1833 ldlm_work_cp_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
1835 struct ldlm_cb_set_arg *arg = opaq;
1837 struct ldlm_lock *lock;
1838 ldlm_completion_callback completion_callback;
1841 if (cfs_list_empty(arg->list))
1844 lock = cfs_list_entry(arg->list->next, struct ldlm_lock, l_cp_ast);
1846 /* It's possible to receive a completion AST before we've set
1847 * the l_completion_ast pointer: either because the AST arrived
1848 * before the reply, or simply because there's a small race
1849 * window between receiving the reply and finishing the local
1850 * enqueue. (bug 842)
1852 * This can't happen with the blocking_ast, however, because we
1853 * will never call the local blocking_ast until we drop our
1854 * reader/writer reference, which we won't do until we get the
1855 * reply and finish enqueueing. */
1857 /* nobody should touch l_cp_ast */
1858 lock_res_and_lock(lock);
1859 cfs_list_del_init(&lock->l_cp_ast);
1860 LASSERT(ldlm_is_cp_reqd(lock));
1861 /* save l_completion_ast since it can be changed by
1862 * mds_intent_policy(), see bug 14225 */
1863 completion_callback = lock->l_completion_ast;
1864 ldlm_clear_cp_reqd(lock);
1865 unlock_res_and_lock(lock);
1867 if (completion_callback != NULL)
1868 rc = completion_callback(lock, 0, (void *)arg);
1869 LDLM_LOCK_RELEASE(lock);
1875 * Process a call to revocation AST callback for a lock in ast_work list
1878 ldlm_work_revoke_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
1880 struct ldlm_cb_set_arg *arg = opaq;
1881 struct ldlm_lock_desc desc;
1883 struct ldlm_lock *lock;
1886 if (cfs_list_empty(arg->list))
1889 lock = cfs_list_entry(arg->list->next, struct ldlm_lock, l_rk_ast);
1890 cfs_list_del_init(&lock->l_rk_ast);
1892 /* the desc just pretend to exclusive */
1893 ldlm_lock2desc(lock, &desc);
1894 desc.l_req_mode = LCK_EX;
1895 desc.l_granted_mode = 0;
1897 rc = lock->l_blocking_ast(lock, &desc, (void*)arg, LDLM_CB_BLOCKING);
1898 LDLM_LOCK_RELEASE(lock);
1904 * Process a call to glimpse AST callback for a lock in ast_work list
1906 int ldlm_work_gl_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
1908 struct ldlm_cb_set_arg *arg = opaq;
1909 struct ldlm_glimpse_work *gl_work;
1910 struct ldlm_lock *lock;
1914 if (cfs_list_empty(arg->list))
1917 gl_work = cfs_list_entry(arg->list->next, struct ldlm_glimpse_work,
1919 cfs_list_del_init(&gl_work->gl_list);
1921 lock = gl_work->gl_lock;
1923 /* transfer the glimpse descriptor to ldlm_cb_set_arg */
1924 arg->gl_desc = gl_work->gl_desc;
1926 /* invoke the actual glimpse callback */
1927 if (lock->l_glimpse_ast(lock, (void*)arg) == 0)
1930 LDLM_LOCK_RELEASE(lock);
1932 if ((gl_work->gl_flags & LDLM_GL_WORK_NOFREE) == 0)
1933 OBD_FREE_PTR(gl_work);
1939 * Process list of locks in need of ASTs being sent.
1941 * Used on server to send multiple ASTs together instead of sending one by
1944 int ldlm_run_ast_work(struct ldlm_namespace *ns, cfs_list_t *rpc_list,
1945 ldlm_desc_ast_t ast_type)
1947 struct ldlm_cb_set_arg *arg;
1948 set_producer_func work_ast_lock;
1951 if (cfs_list_empty(rpc_list))
1958 atomic_set(&arg->restart, 0);
1959 arg->list = rpc_list;
1962 case LDLM_WORK_BL_AST:
1963 arg->type = LDLM_BL_CALLBACK;
1964 work_ast_lock = ldlm_work_bl_ast_lock;
1966 case LDLM_WORK_CP_AST:
1967 arg->type = LDLM_CP_CALLBACK;
1968 work_ast_lock = ldlm_work_cp_ast_lock;
1970 case LDLM_WORK_REVOKE_AST:
1971 arg->type = LDLM_BL_CALLBACK;
1972 work_ast_lock = ldlm_work_revoke_ast_lock;
1974 case LDLM_WORK_GL_AST:
1975 arg->type = LDLM_GL_CALLBACK;
1976 work_ast_lock = ldlm_work_gl_ast_lock;
1982 /* We create a ptlrpc request set with flow control extension.
1983 * This request set will use the work_ast_lock function to produce new
1984 * requests and will send a new request each time one completes in order
1985 * to keep the number of requests in flight to ns_max_parallel_ast */
1986 arg->set = ptlrpc_prep_fcset(ns->ns_max_parallel_ast ? : UINT_MAX,
1987 work_ast_lock, arg);
1988 if (arg->set == NULL)
1989 GOTO(out, rc = -ENOMEM);
1991 ptlrpc_set_wait(arg->set);
1992 ptlrpc_set_destroy(arg->set);
1994 rc = atomic_read(&arg->restart) ? -ERESTART : 0;
2001 static int reprocess_one_queue(struct ldlm_resource *res, void *closure)
2003 ldlm_reprocess_all(res);
2004 return LDLM_ITER_CONTINUE;
2007 static int ldlm_reprocess_res(cfs_hash_t *hs, cfs_hash_bd_t *bd,
2008 cfs_hlist_node_t *hnode, void *arg)
2010 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
2013 rc = reprocess_one_queue(res, arg);
2015 return rc == LDLM_ITER_STOP;
2019 * Iterate through all resources on a namespace attempting to grant waiting
2022 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns)
2027 cfs_hash_for_each_nolock(ns->ns_rs_hash,
2028 ldlm_reprocess_res, NULL);
2032 EXPORT_SYMBOL(ldlm_reprocess_all_ns);
2035 * Try to grant all waiting locks on a resource.
2037 * Calls ldlm_reprocess_queue on converting and waiting queues.
2039 * Typically called after some resource locks are cancelled to see
2040 * if anything could be granted as a result of the cancellation.
2042 void ldlm_reprocess_all(struct ldlm_resource *res)
2044 CFS_LIST_HEAD(rpc_list);
2046 #ifdef HAVE_SERVER_SUPPORT
2049 /* Local lock trees don't get reprocessed. */
2050 if (ns_is_client(ldlm_res_to_ns(res))) {
2057 rc = ldlm_reprocess_queue(res, &res->lr_converting, &rpc_list);
2058 if (rc == LDLM_ITER_CONTINUE)
2059 ldlm_reprocess_queue(res, &res->lr_waiting, &rpc_list);
2062 rc = ldlm_run_ast_work(ldlm_res_to_ns(res), &rpc_list,
2064 if (rc == -ERESTART) {
2065 LASSERT(cfs_list_empty(&rpc_list));
2070 if (!ns_is_client(ldlm_res_to_ns(res))) {
2071 CERROR("This is client-side-only module, cannot handle "
2072 "LDLM_NAMESPACE_SERVER resource type lock.\n");
2078 EXPORT_SYMBOL(ldlm_reprocess_all);
2081 * Helper function to call blocking AST for LDLM lock \a lock in a
2082 * "cancelling" mode.
2084 void ldlm_cancel_callback(struct ldlm_lock *lock)
2086 check_res_locked(lock->l_resource);
2087 if (!ldlm_is_cancel(lock)) {
2088 ldlm_set_cancel(lock);
2089 if (lock->l_blocking_ast) {
2090 unlock_res_and_lock(lock);
2091 lock->l_blocking_ast(lock, NULL, lock->l_ast_data,
2093 lock_res_and_lock(lock);
2095 LDLM_DEBUG(lock, "no blocking ast");
2098 ldlm_set_bl_done(lock);
2102 * Remove skiplist-enabled LDLM lock \a req from granted list
2104 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req)
2106 if (req->l_resource->lr_type != LDLM_PLAIN &&
2107 req->l_resource->lr_type != LDLM_IBITS)
2110 cfs_list_del_init(&req->l_sl_policy);
2111 cfs_list_del_init(&req->l_sl_mode);
2115 * Attempts to cancel LDLM lock \a lock that has no reader/writer references.
2117 void ldlm_lock_cancel(struct ldlm_lock *lock)
2119 struct ldlm_resource *res;
2120 struct ldlm_namespace *ns;
2123 lock_res_and_lock(lock);
2125 res = lock->l_resource;
2126 ns = ldlm_res_to_ns(res);
2128 /* Please do not, no matter how tempting, remove this LBUG without
2129 * talking to me first. -phik */
2130 if (lock->l_readers || lock->l_writers) {
2131 LDLM_ERROR(lock, "lock still has references");
2135 if (ldlm_is_waited(lock))
2136 ldlm_del_waiting_lock(lock);
2138 /* Releases cancel callback. */
2139 ldlm_cancel_callback(lock);
2141 /* Yes, second time, just in case it was added again while we were
2142 * running with no res lock in ldlm_cancel_callback */
2143 if (ldlm_is_waited(lock))
2144 ldlm_del_waiting_lock(lock);
2146 ldlm_resource_unlink_lock(lock);
2147 ldlm_lock_destroy_nolock(lock);
2149 if (lock->l_granted_mode == lock->l_req_mode)
2150 ldlm_pool_del(&ns->ns_pool, lock);
2152 /* Make sure we will not be called again for same lock what is possible
2153 * if not to zero out lock->l_granted_mode */
2154 lock->l_granted_mode = LCK_MINMODE;
2155 unlock_res_and_lock(lock);
2159 EXPORT_SYMBOL(ldlm_lock_cancel);
2162 * Set opaque data into the lock that only makes sense to upper layer.
2164 int ldlm_lock_set_data(struct lustre_handle *lockh, void *data)
2166 struct ldlm_lock *lock = ldlm_handle2lock(lockh);
2171 if (lock->l_ast_data == NULL)
2172 lock->l_ast_data = data;
2173 if (lock->l_ast_data == data)
2175 LDLM_LOCK_PUT(lock);
2179 EXPORT_SYMBOL(ldlm_lock_set_data);
2181 struct export_cl_data {
2182 struct obd_export *ecl_exp;
2187 * Iterator function for ldlm_cancel_locks_for_export.
2188 * Cancels passed locks.
2190 int ldlm_cancel_locks_for_export_cb(cfs_hash_t *hs, cfs_hash_bd_t *bd,
2191 cfs_hlist_node_t *hnode, void *data)
2194 struct export_cl_data *ecl = (struct export_cl_data *)data;
2195 struct obd_export *exp = ecl->ecl_exp;
2196 struct ldlm_lock *lock = cfs_hash_object(hs, hnode);
2197 struct ldlm_resource *res;
2199 res = ldlm_resource_getref(lock->l_resource);
2200 LDLM_LOCK_GET(lock);
2202 LDLM_DEBUG(lock, "export %p", exp);
2203 ldlm_res_lvbo_update(res, NULL, 1);
2204 ldlm_lock_cancel(lock);
2205 ldlm_reprocess_all(res);
2206 ldlm_resource_putref(res);
2207 LDLM_LOCK_RELEASE(lock);
2210 if ((ecl->ecl_loop & -ecl->ecl_loop) == ecl->ecl_loop) {
2212 "Cancel lock %p for export %p (loop %d), still have "
2213 "%d locks left on hash table.\n",
2214 lock, exp, ecl->ecl_loop,
2215 atomic_read(&hs->hs_count));
2222 * Cancel all locks for given export.
2224 * Typically called on client disconnection/eviction
2226 void ldlm_cancel_locks_for_export(struct obd_export *exp)
2228 struct export_cl_data ecl = {
2233 cfs_hash_for_each_empty(exp->exp_lock_hash,
2234 ldlm_cancel_locks_for_export_cb, &ecl);
2238 * Downgrade an exclusive lock.
2240 * A fast variant of ldlm_lock_convert for convertion of exclusive
2241 * locks. The convertion is always successful.
2242 * Used by Commit on Sharing (COS) code.
2244 * \param lock A lock to convert
2245 * \param new_mode new lock mode
2247 void ldlm_lock_downgrade(struct ldlm_lock *lock, int new_mode)
2251 LASSERT(lock->l_granted_mode & (LCK_PW | LCK_EX));
2252 LASSERT(new_mode == LCK_COS);
2254 lock_res_and_lock(lock);
2255 ldlm_resource_unlink_lock(lock);
2257 * Remove the lock from pool as it will be added again in
2258 * ldlm_grant_lock() called below.
2260 ldlm_pool_del(&ldlm_lock_to_ns(lock)->ns_pool, lock);
2262 lock->l_req_mode = new_mode;
2263 ldlm_grant_lock(lock, NULL);
2264 unlock_res_and_lock(lock);
2265 ldlm_reprocess_all(lock->l_resource);
2269 EXPORT_SYMBOL(ldlm_lock_downgrade);
2272 * Attempt to convert already granted lock to a different mode.
2274 * While lock conversion is not currently used, future client-side
2275 * optimizations could take advantage of it to avoid discarding cached
2278 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
2281 CFS_LIST_HEAD(rpc_list);
2282 struct ldlm_resource *res;
2283 struct ldlm_namespace *ns;
2285 #ifdef HAVE_SERVER_SUPPORT
2287 struct sl_insert_point prev;
2289 struct ldlm_interval *node;
2292 /* Just return if mode is unchanged. */
2293 if (new_mode == lock->l_granted_mode) {
2294 *flags |= LDLM_FL_BLOCK_GRANTED;
2295 RETURN(lock->l_resource);
2298 /* I can't check the type of lock here because the bitlock of lock
2299 * is not held here, so do the allocation blindly. -jay */
2300 OBD_SLAB_ALLOC_PTR_GFP(node, ldlm_interval_slab, GFP_NOFS);
2301 if (node == NULL) /* Actually, this causes EDEADLOCK to be returned */
2304 LASSERTF((new_mode == LCK_PW && lock->l_granted_mode == LCK_PR),
2305 "new_mode %u, granted %u\n", new_mode, lock->l_granted_mode);
2307 lock_res_and_lock(lock);
2309 res = lock->l_resource;
2310 ns = ldlm_res_to_ns(res);
2312 #ifdef HAVE_SERVER_SUPPORT
2313 old_mode = lock->l_req_mode;
2315 lock->l_req_mode = new_mode;
2316 if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS) {
2317 #ifdef HAVE_SERVER_SUPPORT
2318 /* remember the lock position where the lock might be
2319 * added back to the granted list later and also
2320 * remember the join mode for skiplist fixing. */
2321 prev.res_link = lock->l_res_link.prev;
2322 prev.mode_link = lock->l_sl_mode.prev;
2323 prev.policy_link = lock->l_sl_policy.prev;
2325 ldlm_resource_unlink_lock(lock);
2327 ldlm_resource_unlink_lock(lock);
2328 if (res->lr_type == LDLM_EXTENT) {
2329 /* FIXME: ugly code, I have to attach the lock to a
2330 * interval node again since perhaps it will be granted
2332 CFS_INIT_LIST_HEAD(&node->li_group);
2333 ldlm_interval_attach(node, lock);
2339 * Remove old lock from the pool before adding the lock with new
2340 * mode below in ->policy()
2342 ldlm_pool_del(&ns->ns_pool, lock);
2344 /* If this is a local resource, put it on the appropriate list. */
2345 if (ns_is_client(ldlm_res_to_ns(res))) {
2346 if (*flags & (LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_GRANTED)) {
2347 ldlm_resource_add_lock(res, &res->lr_converting, lock);
2349 /* This should never happen, because of the way the
2350 * server handles conversions. */
2351 LDLM_ERROR(lock, "Erroneous flags %x on local lock\n",
2355 ldlm_grant_lock(lock, &rpc_list);
2357 /* FIXME: completion handling not with lr_lock held ! */
2358 if (lock->l_completion_ast)
2359 lock->l_completion_ast(lock, 0, NULL);
2361 #ifdef HAVE_SERVER_SUPPORT
2366 ldlm_processing_policy policy;
2367 policy = ldlm_processing_policy_table[res->lr_type];
2368 rc = policy(lock, &pflags, 0, &err, &rpc_list);
2369 if (rc == LDLM_ITER_STOP) {
2370 lock->l_req_mode = old_mode;
2371 if (res->lr_type == LDLM_EXTENT)
2372 ldlm_extent_add_lock(res, lock);
2374 ldlm_granted_list_add_lock(lock, &prev);
2378 *flags |= LDLM_FL_BLOCK_GRANTED;
2384 CERROR("This is client-side-only module, cannot handle "
2385 "LDLM_NAMESPACE_SERVER resource type lock.\n");
2389 unlock_res_and_lock(lock);
2392 ldlm_run_ast_work(ns, &rpc_list, LDLM_WORK_CP_AST);
2394 OBD_SLAB_FREE(node, ldlm_interval_slab, sizeof(*node));
2397 EXPORT_SYMBOL(ldlm_lock_convert);
2400 * Print lock with lock handle \a lockh description into debug log.
2402 * Used when printing all locks on a resource for debug purposes.
2404 void ldlm_lock_dump_handle(int level, struct lustre_handle *lockh)
2406 struct ldlm_lock *lock;
2408 if (!((libcfs_debug | D_ERROR) & level))
2411 lock = ldlm_handle2lock(lockh);
2415 LDLM_DEBUG_LIMIT(level, lock, "###");
2417 LDLM_LOCK_PUT(lock);
2419 EXPORT_SYMBOL(ldlm_lock_dump_handle);
2422 * Print lock information with custom message into debug log.
2425 void _ldlm_lock_debug(struct ldlm_lock *lock,
2426 struct libcfs_debug_msg_data *msgdata,
2427 const char *fmt, ...)
2430 struct obd_export *exp = lock->l_export;
2431 struct ldlm_resource *resource = lock->l_resource;
2432 char *nid = "local";
2434 va_start(args, fmt);
2436 if (exp && exp->exp_connection) {
2437 nid = libcfs_nid2str(exp->exp_connection->c_peer.nid);
2438 } else if (exp && exp->exp_obd != NULL) {
2439 struct obd_import *imp = exp->exp_obd->u.cli.cl_import;
2440 nid = libcfs_nid2str(imp->imp_connection->c_peer.nid);
2443 if (resource == NULL) {
2444 libcfs_debug_vmsg2(msgdata, fmt, args,
2445 " ns: \?\? lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2446 "res: \?\? rrc=\?\? type: \?\?\? flags: "LPX64" nid: %s "
2447 "remote: "LPX64" expref: %d pid: %u timeout: %lu "
2450 lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
2451 lock->l_readers, lock->l_writers,
2452 ldlm_lockname[lock->l_granted_mode],
2453 ldlm_lockname[lock->l_req_mode],
2454 lock->l_flags, nid, lock->l_remote_handle.cookie,
2455 exp ? atomic_read(&exp->exp_refcount) : -99,
2456 lock->l_pid, lock->l_callback_timeout, lock->l_lvb_type);
2461 switch (resource->lr_type) {
2463 libcfs_debug_vmsg2(msgdata, fmt, args,
2464 " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2465 "res: "DLDLMRES" rrc: %d type: %s ["LPU64"->"LPU64"] "
2466 "(req "LPU64"->"LPU64") flags: "LPX64" nid: %s remote: "
2467 LPX64" expref: %d pid: %u timeout: %lu lvb_type: %d\n",
2468 ldlm_lock_to_ns_name(lock), lock,
2469 lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
2470 lock->l_readers, lock->l_writers,
2471 ldlm_lockname[lock->l_granted_mode],
2472 ldlm_lockname[lock->l_req_mode],
2474 atomic_read(&resource->lr_refcount),
2475 ldlm_typename[resource->lr_type],
2476 lock->l_policy_data.l_extent.start,
2477 lock->l_policy_data.l_extent.end,
2478 lock->l_req_extent.start, lock->l_req_extent.end,
2479 lock->l_flags, nid, lock->l_remote_handle.cookie,
2480 exp ? atomic_read(&exp->exp_refcount) : -99,
2481 lock->l_pid, lock->l_callback_timeout,
2486 libcfs_debug_vmsg2(msgdata, fmt, args,
2487 " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2488 "res: "DLDLMRES" rrc: %d type: %s pid: %d "
2489 "["LPU64"->"LPU64"] flags: "LPX64" nid: %s "
2490 "remote: "LPX64" expref: %d pid: %u timeout: %lu\n",
2491 ldlm_lock_to_ns_name(lock), lock,
2492 lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
2493 lock->l_readers, lock->l_writers,
2494 ldlm_lockname[lock->l_granted_mode],
2495 ldlm_lockname[lock->l_req_mode],
2497 atomic_read(&resource->lr_refcount),
2498 ldlm_typename[resource->lr_type],
2499 lock->l_policy_data.l_flock.pid,
2500 lock->l_policy_data.l_flock.start,
2501 lock->l_policy_data.l_flock.end,
2502 lock->l_flags, nid, lock->l_remote_handle.cookie,
2503 exp ? atomic_read(&exp->exp_refcount) : -99,
2504 lock->l_pid, lock->l_callback_timeout);
2508 libcfs_debug_vmsg2(msgdata, fmt, args,
2509 " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2510 "res: "DLDLMRES" bits "LPX64" rrc: %d type: %s "
2511 "flags: "LPX64" nid: %s remote: "LPX64" expref: %d "
2512 "pid: %u timeout: %lu lvb_type: %d\n",
2513 ldlm_lock_to_ns_name(lock),
2514 lock, lock->l_handle.h_cookie,
2515 atomic_read(&lock->l_refc),
2516 lock->l_readers, lock->l_writers,
2517 ldlm_lockname[lock->l_granted_mode],
2518 ldlm_lockname[lock->l_req_mode],
2520 lock->l_policy_data.l_inodebits.bits,
2521 atomic_read(&resource->lr_refcount),
2522 ldlm_typename[resource->lr_type],
2523 lock->l_flags, nid, lock->l_remote_handle.cookie,
2524 exp ? atomic_read(&exp->exp_refcount) : -99,
2525 lock->l_pid, lock->l_callback_timeout,
2530 libcfs_debug_vmsg2(msgdata, fmt, args,
2531 " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2532 "res: "DLDLMRES" rrc: %d type: %s flags: "LPX64" "
2533 "nid: %s remote: "LPX64" expref: %d pid: %u "
2534 "timeout: %lu lvb_type: %d\n",
2535 ldlm_lock_to_ns_name(lock),
2536 lock, lock->l_handle.h_cookie,
2537 atomic_read(&lock->l_refc),
2538 lock->l_readers, lock->l_writers,
2539 ldlm_lockname[lock->l_granted_mode],
2540 ldlm_lockname[lock->l_req_mode],
2542 atomic_read(&resource->lr_refcount),
2543 ldlm_typename[resource->lr_type],
2544 lock->l_flags, nid, lock->l_remote_handle.cookie,
2545 exp ? atomic_read(&exp->exp_refcount) : -99,
2546 lock->l_pid, lock->l_callback_timeout,
2552 EXPORT_SYMBOL(_ldlm_lock_debug);