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, 2012, 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 <linux/libcfs/libcfs.h>
45 # include <linux/lustre_intent.h>
47 #include <obd_class.h>
48 #include "ldlm_internal.h"
51 char *ldlm_lockname
[] = {
59 [LCK_GROUP
] = "GROUP",
62 EXPORT_SYMBOL(ldlm_lockname
);
64 char *ldlm_typename
[] = {
66 [LDLM_EXTENT
] = "EXT",
70 EXPORT_SYMBOL(ldlm_typename
);
72 static ldlm_policy_wire_to_local_t ldlm_policy_wire18_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_wire18_to_local
,
76 [LDLM_IBITS
- LDLM_MIN_TYPE
] = ldlm_ibits_policy_wire_to_local
,
79 static ldlm_policy_wire_to_local_t ldlm_policy_wire21_to_local
[] = {
80 [LDLM_PLAIN
- LDLM_MIN_TYPE
] = ldlm_plain_policy_wire_to_local
,
81 [LDLM_EXTENT
- LDLM_MIN_TYPE
] = ldlm_extent_policy_wire_to_local
,
82 [LDLM_FLOCK
- LDLM_MIN_TYPE
] = ldlm_flock_policy_wire21_to_local
,
83 [LDLM_IBITS
- LDLM_MIN_TYPE
] = ldlm_ibits_policy_wire_to_local
,
86 static ldlm_policy_local_to_wire_t ldlm_policy_local_to_wire
[] = {
87 [LDLM_PLAIN
- LDLM_MIN_TYPE
] = ldlm_plain_policy_local_to_wire
,
88 [LDLM_EXTENT
- LDLM_MIN_TYPE
] = ldlm_extent_policy_local_to_wire
,
89 [LDLM_FLOCK
- LDLM_MIN_TYPE
] = ldlm_flock_policy_local_to_wire
,
90 [LDLM_IBITS
- LDLM_MIN_TYPE
] = ldlm_ibits_policy_local_to_wire
,
94 * Converts lock policy from local format to on the wire lock_desc format
96 void ldlm_convert_policy_to_wire(ldlm_type_t type
,
97 const ldlm_policy_data_t
*lpolicy
,
98 ldlm_wire_policy_data_t
*wpolicy
)
100 ldlm_policy_local_to_wire_t convert
;
102 convert
= ldlm_policy_local_to_wire
[type
- LDLM_MIN_TYPE
];
104 convert(lpolicy
, wpolicy
);
108 * Converts lock policy from on the wire lock_desc format to local format
110 void ldlm_convert_policy_to_local(struct obd_export
*exp
, ldlm_type_t type
,
111 const ldlm_wire_policy_data_t
*wpolicy
,
112 ldlm_policy_data_t
*lpolicy
)
114 ldlm_policy_wire_to_local_t convert
;
117 /** some badness for 2.0.0 clients, but 2.0.0 isn't supported */
118 new_client
= (exp_connect_flags(exp
) & OBD_CONNECT_FULL20
) != 0;
120 convert
= ldlm_policy_wire21_to_local
[type
- LDLM_MIN_TYPE
];
122 convert
= ldlm_policy_wire18_to_local
[type
- LDLM_MIN_TYPE
];
124 convert(wpolicy
, lpolicy
);
127 char *ldlm_it2str(int it
)
134 case (IT_OPEN
| IT_CREAT
):
149 CERROR("Unknown intent %d\n", it
);
153 EXPORT_SYMBOL(ldlm_it2str
);
155 extern struct kmem_cache
*ldlm_lock_slab
;
158 void ldlm_register_intent(struct ldlm_namespace
*ns
, ldlm_res_policy arg
)
162 EXPORT_SYMBOL(ldlm_register_intent
);
165 * REFCOUNTED LOCK OBJECTS
170 * Get a reference on a lock.
172 * Lock refcounts, during creation:
173 * - one special one for allocation, dec'd only once in destroy
174 * - one for being a lock that's in-use
175 * - one for the addref associated with a new lock
177 struct ldlm_lock
*ldlm_lock_get(struct ldlm_lock
*lock
)
179 atomic_inc(&lock
->l_refc
);
182 EXPORT_SYMBOL(ldlm_lock_get
);
185 * Release lock reference.
187 * Also frees the lock if it was last reference.
189 void ldlm_lock_put(struct ldlm_lock
*lock
)
191 LASSERT(lock
->l_resource
!= LP_POISON
);
192 LASSERT(atomic_read(&lock
->l_refc
) > 0);
193 if (atomic_dec_and_test(&lock
->l_refc
)) {
194 struct ldlm_resource
*res
;
197 "final lock_put on destroyed lock, freeing it.");
199 res
= lock
->l_resource
;
200 LASSERT(lock
->l_flags
& LDLM_FL_DESTROYED
);
201 LASSERT(list_empty(&lock
->l_res_link
));
202 LASSERT(list_empty(&lock
->l_pending_chain
));
204 lprocfs_counter_decr(ldlm_res_to_ns(res
)->ns_stats
,
206 lu_ref_del(&res
->lr_reference
, "lock", lock
);
207 ldlm_resource_putref(res
);
208 lock
->l_resource
= NULL
;
209 if (lock
->l_export
) {
210 class_export_lock_put(lock
->l_export
, lock
);
211 lock
->l_export
= NULL
;
214 if (lock
->l_lvb_data
!= NULL
)
215 OBD_FREE(lock
->l_lvb_data
, lock
->l_lvb_len
);
217 ldlm_interval_free(ldlm_interval_detach(lock
));
218 lu_ref_fini(&lock
->l_reference
);
219 OBD_FREE_RCU(lock
, sizeof(*lock
), &lock
->l_handle
);
222 EXPORT_SYMBOL(ldlm_lock_put
);
225 * Removes LDLM lock \a lock from LRU. Assumes LRU is already locked.
227 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock
*lock
)
230 if (!list_empty(&lock
->l_lru
)) {
231 struct ldlm_namespace
*ns
= ldlm_lock_to_ns(lock
);
233 LASSERT(lock
->l_resource
->lr_type
!= LDLM_FLOCK
);
234 list_del_init(&lock
->l_lru
);
235 if (lock
->l_flags
& LDLM_FL_SKIPPED
)
236 lock
->l_flags
&= ~LDLM_FL_SKIPPED
;
237 LASSERT(ns
->ns_nr_unused
> 0);
245 * Removes LDLM lock \a lock from LRU. Obtains the LRU lock first.
247 int ldlm_lock_remove_from_lru(struct ldlm_lock
*lock
)
249 struct ldlm_namespace
*ns
= ldlm_lock_to_ns(lock
);
252 if (lock
->l_flags
& LDLM_FL_NS_SRV
) {
253 LASSERT(list_empty(&lock
->l_lru
));
257 spin_lock(&ns
->ns_lock
);
258 rc
= ldlm_lock_remove_from_lru_nolock(lock
);
259 spin_unlock(&ns
->ns_lock
);
264 * Adds LDLM lock \a lock to namespace LRU. Assumes LRU is already locked.
266 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock
*lock
)
268 struct ldlm_namespace
*ns
= ldlm_lock_to_ns(lock
);
270 lock
->l_last_used
= cfs_time_current();
271 LASSERT(list_empty(&lock
->l_lru
));
272 LASSERT(lock
->l_resource
->lr_type
!= LDLM_FLOCK
);
273 list_add_tail(&lock
->l_lru
, &ns
->ns_unused_list
);
274 LASSERT(ns
->ns_nr_unused
>= 0);
279 * Adds LDLM lock \a lock to namespace LRU. Obtains necessary LRU locks
282 void ldlm_lock_add_to_lru(struct ldlm_lock
*lock
)
284 struct ldlm_namespace
*ns
= ldlm_lock_to_ns(lock
);
286 spin_lock(&ns
->ns_lock
);
287 ldlm_lock_add_to_lru_nolock(lock
);
288 spin_unlock(&ns
->ns_lock
);
292 * Moves LDLM lock \a lock that is already in namespace LRU to the tail of
293 * the LRU. Performs necessary LRU locking
295 void ldlm_lock_touch_in_lru(struct ldlm_lock
*lock
)
297 struct ldlm_namespace
*ns
= ldlm_lock_to_ns(lock
);
299 if (lock
->l_flags
& LDLM_FL_NS_SRV
) {
300 LASSERT(list_empty(&lock
->l_lru
));
304 spin_lock(&ns
->ns_lock
);
305 if (!list_empty(&lock
->l_lru
)) {
306 ldlm_lock_remove_from_lru_nolock(lock
);
307 ldlm_lock_add_to_lru_nolock(lock
);
309 spin_unlock(&ns
->ns_lock
);
313 * Helper to destroy a locked lock.
315 * Used by ldlm_lock_destroy and ldlm_lock_destroy_nolock
316 * Must be called with l_lock and lr_lock held.
318 * Does not actually free the lock data, but rather marks the lock as
319 * destroyed by setting l_destroyed field in the lock to 1. Destroys a
320 * handle->lock association too, so that the lock can no longer be found
321 * and removes the lock from LRU list. Actual lock freeing occurs when
322 * last lock reference goes away.
324 * Original comment (of some historical value):
325 * This used to have a 'strict' flag, which recovery would use to mark an
326 * in-use lock as needing-to-die. Lest I am ever tempted to put it back, I
327 * shall explain why it's gone: with the new hash table scheme, once you call
328 * ldlm_lock_destroy, you can never drop your final references on this lock.
329 * Because it's not in the hash table anymore. -phil
331 int ldlm_lock_destroy_internal(struct ldlm_lock
*lock
)
333 if (lock
->l_readers
|| lock
->l_writers
) {
334 LDLM_ERROR(lock
, "lock still has references");
338 if (!list_empty(&lock
->l_res_link
)) {
339 LDLM_ERROR(lock
, "lock still on resource");
343 if (lock
->l_flags
& LDLM_FL_DESTROYED
) {
344 LASSERT(list_empty(&lock
->l_lru
));
347 lock
->l_flags
|= LDLM_FL_DESTROYED
;
349 if (lock
->l_export
&& lock
->l_export
->exp_lock_hash
) {
350 /* NB: it's safe to call cfs_hash_del() even lock isn't
351 * in exp_lock_hash. */
352 /* In the function below, .hs_keycmp resolves to
353 * ldlm_export_lock_keycmp() */
354 /* coverity[overrun-buffer-val] */
355 cfs_hash_del(lock
->l_export
->exp_lock_hash
,
356 &lock
->l_remote_handle
, &lock
->l_exp_hash
);
359 ldlm_lock_remove_from_lru(lock
);
360 class_handle_unhash(&lock
->l_handle
);
363 /* Wake anyone waiting for this lock */
364 /* FIXME: I should probably add yet another flag, instead of using
365 * l_export to only call this on clients */
367 class_export_put(lock
->l_export
);
368 lock
->l_export
= NULL
;
369 if (lock
->l_export
&& lock
->l_completion_ast
)
370 lock
->l_completion_ast(lock
, 0);
376 * Destroys a LDLM lock \a lock. Performs necessary locking first.
378 void ldlm_lock_destroy(struct ldlm_lock
*lock
)
382 lock_res_and_lock(lock
);
383 first
= ldlm_lock_destroy_internal(lock
);
384 unlock_res_and_lock(lock
);
386 /* drop reference from hashtable only for first destroy */
388 lu_ref_del(&lock
->l_reference
, "hash", lock
);
389 LDLM_LOCK_RELEASE(lock
);
394 * Destroys a LDLM lock \a lock that is already locked.
396 void ldlm_lock_destroy_nolock(struct ldlm_lock
*lock
)
400 first
= ldlm_lock_destroy_internal(lock
);
401 /* drop reference from hashtable only for first destroy */
403 lu_ref_del(&lock
->l_reference
, "hash", lock
);
404 LDLM_LOCK_RELEASE(lock
);
408 /* this is called by portals_handle2object with the handle lock taken */
409 static void lock_handle_addref(void *lock
)
411 LDLM_LOCK_GET((struct ldlm_lock
*)lock
);
414 static void lock_handle_free(void *lock
, int size
)
416 LASSERT(size
== sizeof(struct ldlm_lock
));
417 OBD_SLAB_FREE(lock
, ldlm_lock_slab
, size
);
420 struct portals_handle_ops lock_handle_ops
= {
421 .hop_addref
= lock_handle_addref
,
422 .hop_free
= lock_handle_free
,
427 * Allocate and initialize new lock structure.
429 * usage: pass in a resource on which you have done ldlm_resource_get
430 * new lock will take over the refcount.
431 * returns: lock with refcount 2 - one for current caller and one for remote
433 static struct ldlm_lock
*ldlm_lock_new(struct ldlm_resource
*resource
)
435 struct ldlm_lock
*lock
;
437 if (resource
== NULL
)
440 OBD_SLAB_ALLOC_PTR_GFP(lock
, ldlm_lock_slab
, __GFP_IO
);
444 spin_lock_init(&lock
->l_lock
);
445 lock
->l_resource
= resource
;
446 lu_ref_add(&resource
->lr_reference
, "lock", lock
);
448 atomic_set(&lock
->l_refc
, 2);
449 INIT_LIST_HEAD(&lock
->l_res_link
);
450 INIT_LIST_HEAD(&lock
->l_lru
);
451 INIT_LIST_HEAD(&lock
->l_pending_chain
);
452 INIT_LIST_HEAD(&lock
->l_bl_ast
);
453 INIT_LIST_HEAD(&lock
->l_cp_ast
);
454 INIT_LIST_HEAD(&lock
->l_rk_ast
);
455 init_waitqueue_head(&lock
->l_waitq
);
456 lock
->l_blocking_lock
= NULL
;
457 INIT_LIST_HEAD(&lock
->l_sl_mode
);
458 INIT_LIST_HEAD(&lock
->l_sl_policy
);
459 INIT_HLIST_NODE(&lock
->l_exp_hash
);
460 INIT_HLIST_NODE(&lock
->l_exp_flock_hash
);
462 lprocfs_counter_incr(ldlm_res_to_ns(resource
)->ns_stats
,
464 INIT_LIST_HEAD(&lock
->l_handle
.h_link
);
465 class_handle_hash(&lock
->l_handle
, &lock_handle_ops
);
467 lu_ref_init(&lock
->l_reference
);
468 lu_ref_add(&lock
->l_reference
, "hash", lock
);
469 lock
->l_callback_timeout
= 0;
471 #if LUSTRE_TRACKS_LOCK_EXP_REFS
472 INIT_LIST_HEAD(&lock
->l_exp_refs_link
);
473 lock
->l_exp_refs_nr
= 0;
474 lock
->l_exp_refs_target
= NULL
;
476 INIT_LIST_HEAD(&lock
->l_exp_list
);
482 * Moves LDLM lock \a lock to another resource.
483 * This is used on client when server returns some other lock than requested
484 * (typically as a result of intent operation)
486 int ldlm_lock_change_resource(struct ldlm_namespace
*ns
, struct ldlm_lock
*lock
,
487 const struct ldlm_res_id
*new_resid
)
489 struct ldlm_resource
*oldres
= lock
->l_resource
;
490 struct ldlm_resource
*newres
;
493 LASSERT(ns_is_client(ns
));
495 lock_res_and_lock(lock
);
496 if (memcmp(new_resid
, &lock
->l_resource
->lr_name
,
497 sizeof(lock
->l_resource
->lr_name
)) == 0) {
499 unlock_res_and_lock(lock
);
503 LASSERT(new_resid
->name
[0] != 0);
505 /* This function assumes that the lock isn't on any lists */
506 LASSERT(list_empty(&lock
->l_res_link
));
508 type
= oldres
->lr_type
;
509 unlock_res_and_lock(lock
);
511 newres
= ldlm_resource_get(ns
, NULL
, new_resid
, type
, 1);
515 lu_ref_add(&newres
->lr_reference
, "lock", lock
);
517 * To flip the lock from the old to the new resource, lock, oldres and
518 * newres have to be locked. Resource spin-locks are nested within
519 * lock->l_lock, and are taken in the memory address order to avoid
522 spin_lock(&lock
->l_lock
);
523 oldres
= lock
->l_resource
;
524 if (oldres
< newres
) {
526 lock_res_nested(newres
, LRT_NEW
);
529 lock_res_nested(oldres
, LRT_NEW
);
531 LASSERT(memcmp(new_resid
, &oldres
->lr_name
,
532 sizeof oldres
->lr_name
) != 0);
533 lock
->l_resource
= newres
;
535 unlock_res_and_lock(lock
);
537 /* ...and the flowers are still standing! */
538 lu_ref_del(&oldres
->lr_reference
, "lock", lock
);
539 ldlm_resource_putref(oldres
);
543 EXPORT_SYMBOL(ldlm_lock_change_resource
);
545 /** \defgroup ldlm_handles LDLM HANDLES
546 * Ways to get hold of locks without any addresses.
551 * Fills in handle for LDLM lock \a lock into supplied \a lockh
552 * Does not take any references.
554 void ldlm_lock2handle(const struct ldlm_lock
*lock
, struct lustre_handle
*lockh
)
556 lockh
->cookie
= lock
->l_handle
.h_cookie
;
558 EXPORT_SYMBOL(ldlm_lock2handle
);
561 * Obtain a lock reference by handle.
563 * if \a flags: atomically get the lock and set the flags.
564 * Return NULL if flag already set
566 struct ldlm_lock
*__ldlm_handle2lock(const struct lustre_handle
*handle
,
569 struct ldlm_lock
*lock
;
573 lock
= class_handle2object(handle
->cookie
);
577 /* It's unlikely but possible that someone marked the lock as
578 * destroyed after we did handle2object on it */
579 if (flags
== 0 && ((lock
->l_flags
& LDLM_FL_DESTROYED
)== 0)) {
580 lu_ref_add(&lock
->l_reference
, "handle", current
);
584 lock_res_and_lock(lock
);
586 LASSERT(lock
->l_resource
!= NULL
);
588 lu_ref_add_atomic(&lock
->l_reference
, "handle", current
);
589 if (unlikely(lock
->l_flags
& LDLM_FL_DESTROYED
)) {
590 unlock_res_and_lock(lock
);
591 CDEBUG(D_INFO
, "lock already destroyed: lock %p\n", lock
);
596 if (flags
&& (lock
->l_flags
& flags
)) {
597 unlock_res_and_lock(lock
);
603 lock
->l_flags
|= flags
;
605 unlock_res_and_lock(lock
);
608 EXPORT_SYMBOL(__ldlm_handle2lock
);
609 /** @} ldlm_handles */
612 * Fill in "on the wire" representation for given LDLM lock into supplied
613 * lock descriptor \a desc structure.
615 void ldlm_lock2desc(struct ldlm_lock
*lock
, struct ldlm_lock_desc
*desc
)
617 struct obd_export
*exp
= lock
->l_export
?: lock
->l_conn_export
;
619 /* INODEBITS_INTEROP: If the other side does not support
620 * inodebits, reply with a plain lock descriptor. */
621 if ((lock
->l_resource
->lr_type
== LDLM_IBITS
) &&
622 (exp
&& !(exp_connect_flags(exp
) & OBD_CONNECT_IBITS
))) {
623 /* Make sure all the right bits are set in this lock we
624 are going to pass to client */
625 LASSERTF(lock
->l_policy_data
.l_inodebits
.bits
==
626 (MDS_INODELOCK_LOOKUP
| MDS_INODELOCK_UPDATE
|
627 MDS_INODELOCK_LAYOUT
),
628 "Inappropriate inode lock bits during "
629 "conversion " LPU64
"\n",
630 lock
->l_policy_data
.l_inodebits
.bits
);
632 ldlm_res2desc(lock
->l_resource
, &desc
->l_resource
);
633 desc
->l_resource
.lr_type
= LDLM_PLAIN
;
635 /* Convert "new" lock mode to something old client can
637 if ((lock
->l_req_mode
== LCK_CR
) ||
638 (lock
->l_req_mode
== LCK_CW
))
639 desc
->l_req_mode
= LCK_PR
;
641 desc
->l_req_mode
= lock
->l_req_mode
;
642 if ((lock
->l_granted_mode
== LCK_CR
) ||
643 (lock
->l_granted_mode
== LCK_CW
)) {
644 desc
->l_granted_mode
= LCK_PR
;
646 /* We never grant PW/EX locks to clients */
647 LASSERT((lock
->l_granted_mode
!= LCK_PW
) &&
648 (lock
->l_granted_mode
!= LCK_EX
));
649 desc
->l_granted_mode
= lock
->l_granted_mode
;
652 /* We do not copy policy here, because there is no
653 policy for plain locks */
655 ldlm_res2desc(lock
->l_resource
, &desc
->l_resource
);
656 desc
->l_req_mode
= lock
->l_req_mode
;
657 desc
->l_granted_mode
= lock
->l_granted_mode
;
658 ldlm_convert_policy_to_wire(lock
->l_resource
->lr_type
,
659 &lock
->l_policy_data
,
660 &desc
->l_policy_data
);
663 EXPORT_SYMBOL(ldlm_lock2desc
);
666 * Add a lock to list of conflicting locks to send AST to.
668 * Only add if we have not sent a blocking AST to the lock yet.
670 void ldlm_add_bl_work_item(struct ldlm_lock
*lock
, struct ldlm_lock
*new,
671 struct list_head
*work_list
)
673 if ((lock
->l_flags
& LDLM_FL_AST_SENT
) == 0) {
674 LDLM_DEBUG(lock
, "lock incompatible; sending blocking AST.");
675 lock
->l_flags
|= LDLM_FL_AST_SENT
;
676 /* If the enqueuing client said so, tell the AST recipient to
677 * discard dirty data, rather than writing back. */
678 if (new->l_flags
& LDLM_FL_AST_DISCARD_DATA
)
679 lock
->l_flags
|= LDLM_FL_DISCARD_DATA
;
680 LASSERT(list_empty(&lock
->l_bl_ast
));
681 list_add(&lock
->l_bl_ast
, work_list
);
683 LASSERT(lock
->l_blocking_lock
== NULL
);
684 lock
->l_blocking_lock
= LDLM_LOCK_GET(new);
689 * Add a lock to list of just granted locks to send completion AST to.
691 void ldlm_add_cp_work_item(struct ldlm_lock
*lock
, struct list_head
*work_list
)
693 if ((lock
->l_flags
& LDLM_FL_CP_REQD
) == 0) {
694 lock
->l_flags
|= LDLM_FL_CP_REQD
;
695 LDLM_DEBUG(lock
, "lock granted; sending completion AST.");
696 LASSERT(list_empty(&lock
->l_cp_ast
));
697 list_add(&lock
->l_cp_ast
, work_list
);
703 * Aggregator function to add AST work items into a list. Determines
704 * what sort of an AST work needs to be done and calls the proper
706 * Must be called with lr_lock held.
708 void ldlm_add_ast_work_item(struct ldlm_lock
*lock
, struct ldlm_lock
*new,
709 struct list_head
*work_list
)
711 check_res_locked(lock
->l_resource
);
713 ldlm_add_bl_work_item(lock
, new, work_list
);
715 ldlm_add_cp_work_item(lock
, work_list
);
719 * Add specified reader/writer reference to LDLM lock with handle \a lockh.
720 * r/w reference type is determined by \a mode
721 * Calls ldlm_lock_addref_internal.
723 void ldlm_lock_addref(struct lustre_handle
*lockh
, __u32 mode
)
725 struct ldlm_lock
*lock
;
727 lock
= ldlm_handle2lock(lockh
);
728 LASSERT(lock
!= NULL
);
729 ldlm_lock_addref_internal(lock
, mode
);
732 EXPORT_SYMBOL(ldlm_lock_addref
);
736 * Add specified reader/writer reference to LDLM lock \a lock.
737 * r/w reference type is determined by \a mode
738 * Removes lock from LRU if it is there.
739 * Assumes the LDLM lock is already locked.
741 void ldlm_lock_addref_internal_nolock(struct ldlm_lock
*lock
, __u32 mode
)
743 ldlm_lock_remove_from_lru(lock
);
744 if (mode
& (LCK_NL
| LCK_CR
| LCK_PR
)) {
746 lu_ref_add_atomic(&lock
->l_reference
, "reader", lock
);
748 if (mode
& (LCK_EX
| LCK_CW
| LCK_PW
| LCK_GROUP
| LCK_COS
)) {
750 lu_ref_add_atomic(&lock
->l_reference
, "writer", lock
);
753 lu_ref_add_atomic(&lock
->l_reference
, "user", lock
);
754 LDLM_DEBUG(lock
, "ldlm_lock_addref(%s)", ldlm_lockname
[mode
]);
758 * Attempts to add reader/writer reference to a lock with handle \a lockh, and
759 * fails if lock is already LDLM_FL_CBPENDING or destroyed.
761 * \retval 0 success, lock was addref-ed
763 * \retval -EAGAIN lock is being canceled.
765 int ldlm_lock_addref_try(struct lustre_handle
*lockh
, __u32 mode
)
767 struct ldlm_lock
*lock
;
771 lock
= ldlm_handle2lock(lockh
);
773 lock_res_and_lock(lock
);
774 if (lock
->l_readers
!= 0 || lock
->l_writers
!= 0 ||
775 !(lock
->l_flags
& LDLM_FL_CBPENDING
)) {
776 ldlm_lock_addref_internal_nolock(lock
, mode
);
779 unlock_res_and_lock(lock
);
784 EXPORT_SYMBOL(ldlm_lock_addref_try
);
787 * Add specified reader/writer reference to LDLM lock \a lock.
788 * Locks LDLM lock and calls ldlm_lock_addref_internal_nolock to do the work.
789 * Only called for local locks.
791 void ldlm_lock_addref_internal(struct ldlm_lock
*lock
, __u32 mode
)
793 lock_res_and_lock(lock
);
794 ldlm_lock_addref_internal_nolock(lock
, mode
);
795 unlock_res_and_lock(lock
);
799 * Removes reader/writer reference for LDLM lock \a lock.
800 * Assumes LDLM lock is already locked.
801 * only called in ldlm_flock_destroy and for local locks.
802 * Does NOT add lock to LRU if no r/w references left to accomodate flock locks
803 * that cannot be placed in LRU.
805 void ldlm_lock_decref_internal_nolock(struct ldlm_lock
*lock
, __u32 mode
)
807 LDLM_DEBUG(lock
, "ldlm_lock_decref(%s)", ldlm_lockname
[mode
]);
808 if (mode
& (LCK_NL
| LCK_CR
| LCK_PR
)) {
809 LASSERT(lock
->l_readers
> 0);
810 lu_ref_del(&lock
->l_reference
, "reader", lock
);
813 if (mode
& (LCK_EX
| LCK_CW
| LCK_PW
| LCK_GROUP
| LCK_COS
)) {
814 LASSERT(lock
->l_writers
> 0);
815 lu_ref_del(&lock
->l_reference
, "writer", lock
);
819 lu_ref_del(&lock
->l_reference
, "user", lock
);
820 LDLM_LOCK_RELEASE(lock
); /* matches the LDLM_LOCK_GET() in addref */
824 * Removes reader/writer reference for LDLM lock \a lock.
825 * Locks LDLM lock first.
826 * If the lock is determined to be client lock on a client and r/w refcount
827 * drops to zero and the lock is not blocked, the lock is added to LRU lock
829 * For blocked LDLM locks if r/w count drops to zero, blocking_ast is called.
831 void ldlm_lock_decref_internal(struct ldlm_lock
*lock
, __u32 mode
)
833 struct ldlm_namespace
*ns
;
835 lock_res_and_lock(lock
);
837 ns
= ldlm_lock_to_ns(lock
);
839 ldlm_lock_decref_internal_nolock(lock
, mode
);
841 if (lock
->l_flags
& LDLM_FL_LOCAL
&&
842 !lock
->l_readers
&& !lock
->l_writers
) {
843 /* If this is a local lock on a server namespace and this was
844 * the last reference, cancel the lock. */
845 CDEBUG(D_INFO
, "forcing cancel of local lock\n");
846 lock
->l_flags
|= LDLM_FL_CBPENDING
;
849 if (!lock
->l_readers
&& !lock
->l_writers
&&
850 (lock
->l_flags
& LDLM_FL_CBPENDING
)) {
851 /* If we received a blocked AST and this was the last reference,
852 * run the callback. */
853 if ((lock
->l_flags
& LDLM_FL_NS_SRV
) && lock
->l_export
)
854 CERROR("FL_CBPENDING set on non-local lock--just a "
857 LDLM_DEBUG(lock
, "final decref done on cbpending lock");
859 LDLM_LOCK_GET(lock
); /* dropped by bl thread */
860 ldlm_lock_remove_from_lru(lock
);
861 unlock_res_and_lock(lock
);
863 if (lock
->l_flags
& LDLM_FL_FAIL_LOC
)
864 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE
);
866 if ((lock
->l_flags
& LDLM_FL_ATOMIC_CB
) ||
867 ldlm_bl_to_thread_lock(ns
, NULL
, lock
) != 0)
868 ldlm_handle_bl_callback(ns
, NULL
, lock
);
869 } else if (ns_is_client(ns
) &&
870 !lock
->l_readers
&& !lock
->l_writers
&&
871 !(lock
->l_flags
& LDLM_FL_NO_LRU
) &&
872 !(lock
->l_flags
& LDLM_FL_BL_AST
)) {
874 LDLM_DEBUG(lock
, "add lock into lru list");
876 /* If this is a client-side namespace and this was the last
877 * reference, put it on the LRU. */
878 ldlm_lock_add_to_lru(lock
);
879 unlock_res_and_lock(lock
);
881 if (lock
->l_flags
& LDLM_FL_FAIL_LOC
)
882 OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE
);
884 /* Call ldlm_cancel_lru() only if EARLY_CANCEL and LRU RESIZE
885 * are not supported by the server, otherwise, it is done on
887 if (!exp_connect_cancelset(lock
->l_conn_export
) &&
888 !ns_connect_lru_resize(ns
))
889 ldlm_cancel_lru(ns
, 0, LCF_ASYNC
, 0);
891 LDLM_DEBUG(lock
, "do not add lock into lru list");
892 unlock_res_and_lock(lock
);
897 * Decrease reader/writer refcount for LDLM lock with handle \a lockh
899 void ldlm_lock_decref(struct lustre_handle
*lockh
, __u32 mode
)
901 struct ldlm_lock
*lock
= __ldlm_handle2lock(lockh
, 0);
902 LASSERTF(lock
!= NULL
, "Non-existing lock: "LPX64
"\n", lockh
->cookie
);
903 ldlm_lock_decref_internal(lock
, mode
);
906 EXPORT_SYMBOL(ldlm_lock_decref
);
909 * Decrease reader/writer refcount for LDLM lock with handle
910 * \a lockh and mark it for subsequent cancellation once r/w refcount
911 * drops to zero instead of putting into LRU.
913 * Typical usage is for GROUP locks which we cannot allow to be cached.
915 void ldlm_lock_decref_and_cancel(struct lustre_handle
*lockh
, __u32 mode
)
917 struct ldlm_lock
*lock
= __ldlm_handle2lock(lockh
, 0);
919 LASSERT(lock
!= NULL
);
921 LDLM_DEBUG(lock
, "ldlm_lock_decref(%s)", ldlm_lockname
[mode
]);
922 lock_res_and_lock(lock
);
923 lock
->l_flags
|= LDLM_FL_CBPENDING
;
924 unlock_res_and_lock(lock
);
925 ldlm_lock_decref_internal(lock
, mode
);
928 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel
);
930 struct sl_insert_point
{
931 struct list_head
*res_link
;
932 struct list_head
*mode_link
;
933 struct list_head
*policy_link
;
937 * Finds a position to insert the new lock into granted lock list.
939 * Used for locks eligible for skiplist optimization.
942 * queue [input]: the granted list where search acts on;
943 * req [input]: the lock whose position to be located;
944 * prev [output]: positions within 3 lists to insert @req to
948 * - ldlm_grant_lock_with_skiplist
950 static void search_granted_lock(struct list_head
*queue
,
951 struct ldlm_lock
*req
,
952 struct sl_insert_point
*prev
)
954 struct list_head
*tmp
;
955 struct ldlm_lock
*lock
, *mode_end
, *policy_end
;
957 list_for_each(tmp
, queue
) {
958 lock
= list_entry(tmp
, struct ldlm_lock
, l_res_link
);
960 mode_end
= list_entry(lock
->l_sl_mode
.prev
,
961 struct ldlm_lock
, l_sl_mode
);
963 if (lock
->l_req_mode
!= req
->l_req_mode
) {
964 /* jump to last lock of mode group */
965 tmp
= &mode_end
->l_res_link
;
969 /* suitable mode group is found */
970 if (lock
->l_resource
->lr_type
== LDLM_PLAIN
) {
971 /* insert point is last lock of the mode group */
972 prev
->res_link
= &mode_end
->l_res_link
;
973 prev
->mode_link
= &mode_end
->l_sl_mode
;
974 prev
->policy_link
= &req
->l_sl_policy
;
976 } else if (lock
->l_resource
->lr_type
== LDLM_IBITS
) {
979 list_entry(lock
->l_sl_policy
.prev
,
983 if (lock
->l_policy_data
.l_inodebits
.bits
==
984 req
->l_policy_data
.l_inodebits
.bits
) {
985 /* insert point is last lock of
986 * the policy group */
988 &policy_end
->l_res_link
;
990 &policy_end
->l_sl_mode
;
992 &policy_end
->l_sl_policy
;
996 if (policy_end
== mode_end
)
997 /* done with mode group */
1000 /* go to next policy group within mode group */
1001 tmp
= policy_end
->l_res_link
.next
;
1002 lock
= list_entry(tmp
, struct ldlm_lock
,
1004 } /* loop over policy groups within the mode group */
1006 /* insert point is last lock of the mode group,
1007 * new policy group is started */
1008 prev
->res_link
= &mode_end
->l_res_link
;
1009 prev
->mode_link
= &mode_end
->l_sl_mode
;
1010 prev
->policy_link
= &req
->l_sl_policy
;
1013 LDLM_ERROR(lock
,"is not LDLM_PLAIN or LDLM_IBITS lock");
1018 /* insert point is last lock on the queue,
1019 * new mode group and new policy group are started */
1020 prev
->res_link
= queue
->prev
;
1021 prev
->mode_link
= &req
->l_sl_mode
;
1022 prev
->policy_link
= &req
->l_sl_policy
;
1027 * Add a lock into resource granted list after a position described by
1030 static void ldlm_granted_list_add_lock(struct ldlm_lock
*lock
,
1031 struct sl_insert_point
*prev
)
1033 struct ldlm_resource
*res
= lock
->l_resource
;
1035 check_res_locked(res
);
1037 ldlm_resource_dump(D_INFO
, res
);
1038 LDLM_DEBUG(lock
, "About to add lock:");
1040 if (lock
->l_flags
& LDLM_FL_DESTROYED
) {
1041 CDEBUG(D_OTHER
, "Lock destroyed, not adding to resource\n");
1045 LASSERT(list_empty(&lock
->l_res_link
));
1046 LASSERT(list_empty(&lock
->l_sl_mode
));
1047 LASSERT(list_empty(&lock
->l_sl_policy
));
1050 * lock->link == prev->link means lock is first starting the group.
1051 * Don't re-add to itself to suppress kernel warnings.
1053 if (&lock
->l_res_link
!= prev
->res_link
)
1054 list_add(&lock
->l_res_link
, prev
->res_link
);
1055 if (&lock
->l_sl_mode
!= prev
->mode_link
)
1056 list_add(&lock
->l_sl_mode
, prev
->mode_link
);
1057 if (&lock
->l_sl_policy
!= prev
->policy_link
)
1058 list_add(&lock
->l_sl_policy
, prev
->policy_link
);
1062 * Add a lock to granted list on a resource maintaining skiplist
1065 static void ldlm_grant_lock_with_skiplist(struct ldlm_lock
*lock
)
1067 struct sl_insert_point prev
;
1069 LASSERT(lock
->l_req_mode
== lock
->l_granted_mode
);
1071 search_granted_lock(&lock
->l_resource
->lr_granted
, lock
, &prev
);
1072 ldlm_granted_list_add_lock(lock
, &prev
);
1076 * Perform lock granting bookkeeping.
1078 * Includes putting the lock into granted list and updating lock mode.
1080 * - ldlm_lock_enqueue
1081 * - ldlm_reprocess_queue
1082 * - ldlm_lock_convert
1084 * must be called with lr_lock held
1086 void ldlm_grant_lock(struct ldlm_lock
*lock
, struct list_head
*work_list
)
1088 struct ldlm_resource
*res
= lock
->l_resource
;
1090 check_res_locked(res
);
1092 lock
->l_granted_mode
= lock
->l_req_mode
;
1093 if (res
->lr_type
== LDLM_PLAIN
|| res
->lr_type
== LDLM_IBITS
)
1094 ldlm_grant_lock_with_skiplist(lock
);
1095 else if (res
->lr_type
== LDLM_EXTENT
)
1096 ldlm_extent_add_lock(res
, lock
);
1098 ldlm_resource_add_lock(res
, &res
->lr_granted
, lock
);
1100 if (lock
->l_granted_mode
< res
->lr_most_restr
)
1101 res
->lr_most_restr
= lock
->l_granted_mode
;
1103 if (work_list
&& lock
->l_completion_ast
!= NULL
)
1104 ldlm_add_ast_work_item(lock
, NULL
, work_list
);
1106 ldlm_pool_add(&ldlm_res_to_ns(res
)->ns_pool
, lock
);
1110 * Search for a lock with given properties in a queue.
1112 * \retval a referenced lock or NULL. See the flag descriptions below, in the
1113 * comment above ldlm_lock_match
1115 static struct ldlm_lock
*search_queue(struct list_head
*queue
,
1117 ldlm_policy_data_t
*policy
,
1118 struct ldlm_lock
*old_lock
,
1119 __u64 flags
, int unref
)
1121 struct ldlm_lock
*lock
;
1122 struct list_head
*tmp
;
1124 list_for_each(tmp
, queue
) {
1127 lock
= list_entry(tmp
, struct ldlm_lock
, l_res_link
);
1129 if (lock
== old_lock
)
1132 /* llite sometimes wants to match locks that will be
1133 * canceled when their users drop, but we allow it to match
1134 * if it passes in CBPENDING and the lock still has users.
1135 * this is generally only going to be used by children
1136 * whose parents already hold a lock so forward progress
1137 * can still happen. */
1138 if (lock
->l_flags
& LDLM_FL_CBPENDING
&&
1139 !(flags
& LDLM_FL_CBPENDING
))
1141 if (!unref
&& lock
->l_flags
& LDLM_FL_CBPENDING
&&
1142 lock
->l_readers
== 0 && lock
->l_writers
== 0)
1145 if (!(lock
->l_req_mode
& *mode
))
1147 match
= lock
->l_req_mode
;
1149 if (lock
->l_resource
->lr_type
== LDLM_EXTENT
&&
1150 (lock
->l_policy_data
.l_extent
.start
>
1151 policy
->l_extent
.start
||
1152 lock
->l_policy_data
.l_extent
.end
< policy
->l_extent
.end
))
1155 if (unlikely(match
== LCK_GROUP
) &&
1156 lock
->l_resource
->lr_type
== LDLM_EXTENT
&&
1157 lock
->l_policy_data
.l_extent
.gid
!= policy
->l_extent
.gid
)
1160 /* We match if we have existing lock with same or wider set
1162 if (lock
->l_resource
->lr_type
== LDLM_IBITS
&&
1163 ((lock
->l_policy_data
.l_inodebits
.bits
&
1164 policy
->l_inodebits
.bits
) !=
1165 policy
->l_inodebits
.bits
))
1168 if (!unref
&& (lock
->l_flags
& LDLM_FL_GONE_MASK
))
1171 if ((flags
& LDLM_FL_LOCAL_ONLY
) &&
1172 !(lock
->l_flags
& LDLM_FL_LOCAL
))
1175 if (flags
& LDLM_FL_TEST_LOCK
) {
1176 LDLM_LOCK_GET(lock
);
1177 ldlm_lock_touch_in_lru(lock
);
1179 ldlm_lock_addref_internal_nolock(lock
, match
);
1188 void ldlm_lock_fail_match_locked(struct ldlm_lock
*lock
)
1190 if ((lock
->l_flags
& LDLM_FL_FAIL_NOTIFIED
) == 0) {
1191 lock
->l_flags
|= LDLM_FL_FAIL_NOTIFIED
;
1192 wake_up_all(&lock
->l_waitq
);
1195 EXPORT_SYMBOL(ldlm_lock_fail_match_locked
);
1197 void ldlm_lock_fail_match(struct ldlm_lock
*lock
)
1199 lock_res_and_lock(lock
);
1200 ldlm_lock_fail_match_locked(lock
);
1201 unlock_res_and_lock(lock
);
1203 EXPORT_SYMBOL(ldlm_lock_fail_match
);
1206 * Mark lock as "matchable" by OST.
1208 * Used to prevent certain races in LOV/OSC where the lock is granted, but LVB
1210 * Assumes LDLM lock is already locked.
1212 void ldlm_lock_allow_match_locked(struct ldlm_lock
*lock
)
1214 lock
->l_flags
|= LDLM_FL_LVB_READY
;
1215 wake_up_all(&lock
->l_waitq
);
1217 EXPORT_SYMBOL(ldlm_lock_allow_match_locked
);
1220 * Mark lock as "matchable" by OST.
1221 * Locks the lock and then \see ldlm_lock_allow_match_locked
1223 void ldlm_lock_allow_match(struct ldlm_lock
*lock
)
1225 lock_res_and_lock(lock
);
1226 ldlm_lock_allow_match_locked(lock
);
1227 unlock_res_and_lock(lock
);
1229 EXPORT_SYMBOL(ldlm_lock_allow_match
);
1232 * Attempt to find a lock with specified properties.
1234 * Typically returns a reference to matched lock unless LDLM_FL_TEST_LOCK is
1237 * Can be called in two ways:
1239 * If 'ns' is NULL, then lockh describes an existing lock that we want to look
1240 * for a duplicate of.
1242 * Otherwise, all of the fields must be filled in, to match against.
1244 * If 'flags' contains LDLM_FL_LOCAL_ONLY, then only match local locks on the
1245 * server (ie, connh is NULL)
1246 * If 'flags' contains LDLM_FL_BLOCK_GRANTED, then only locks on the granted
1247 * list will be considered
1248 * If 'flags' contains LDLM_FL_CBPENDING, then locks that have been marked
1249 * to be canceled can still be matched as long as they still have reader
1250 * or writer refernces
1251 * If 'flags' contains LDLM_FL_TEST_LOCK, then don't actually reference a lock,
1252 * just tell us if we would have matched.
1254 * \retval 1 if it finds an already-existing lock that is compatible; in this
1255 * case, lockh is filled in with a addref()ed lock
1257 * We also check security context, and if that fails we simply return 0 (to
1258 * keep caller code unchanged), the context failure will be discovered by
1259 * caller sometime later.
1261 ldlm_mode_t
ldlm_lock_match(struct ldlm_namespace
*ns
, __u64 flags
,
1262 const struct ldlm_res_id
*res_id
, ldlm_type_t type
,
1263 ldlm_policy_data_t
*policy
, ldlm_mode_t mode
,
1264 struct lustre_handle
*lockh
, int unref
)
1266 struct ldlm_resource
*res
;
1267 struct ldlm_lock
*lock
, *old_lock
= NULL
;
1271 old_lock
= ldlm_handle2lock(lockh
);
1274 ns
= ldlm_lock_to_ns(old_lock
);
1275 res_id
= &old_lock
->l_resource
->lr_name
;
1276 type
= old_lock
->l_resource
->lr_type
;
1277 mode
= old_lock
->l_req_mode
;
1280 res
= ldlm_resource_get(ns
, NULL
, res_id
, type
, 0);
1282 LASSERT(old_lock
== NULL
);
1286 LDLM_RESOURCE_ADDREF(res
);
1289 lock
= search_queue(&res
->lr_granted
, &mode
, policy
, old_lock
,
1293 if (flags
& LDLM_FL_BLOCK_GRANTED
)
1295 lock
= search_queue(&res
->lr_converting
, &mode
, policy
, old_lock
,
1299 lock
= search_queue(&res
->lr_waiting
, &mode
, policy
, old_lock
,
1306 LDLM_RESOURCE_DELREF(res
);
1307 ldlm_resource_putref(res
);
1310 ldlm_lock2handle(lock
, lockh
);
1311 if ((flags
& LDLM_FL_LVB_READY
) &&
1312 (!(lock
->l_flags
& LDLM_FL_LVB_READY
))) {
1313 __u64 wait_flags
= LDLM_FL_LVB_READY
|
1314 LDLM_FL_DESTROYED
| LDLM_FL_FAIL_NOTIFIED
;
1315 struct l_wait_info lwi
;
1316 if (lock
->l_completion_ast
) {
1317 int err
= lock
->l_completion_ast(lock
,
1318 LDLM_FL_WAIT_NOREPROC
,
1321 if (flags
& LDLM_FL_TEST_LOCK
)
1322 LDLM_LOCK_RELEASE(lock
);
1324 ldlm_lock_decref_internal(lock
,
1331 lwi
= LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout
),
1332 NULL
, LWI_ON_SIGNAL_NOOP
, NULL
);
1334 /* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
1335 l_wait_event(lock
->l_waitq
,
1336 lock
->l_flags
& wait_flags
,
1338 if (!(lock
->l_flags
& LDLM_FL_LVB_READY
)) {
1339 if (flags
& LDLM_FL_TEST_LOCK
)
1340 LDLM_LOCK_RELEASE(lock
);
1342 ldlm_lock_decref_internal(lock
, mode
);
1349 LDLM_DEBUG(lock
, "matched ("LPU64
" "LPU64
")",
1350 (type
== LDLM_PLAIN
|| type
== LDLM_IBITS
) ?
1351 res_id
->name
[2] : policy
->l_extent
.start
,
1352 (type
== LDLM_PLAIN
|| type
== LDLM_IBITS
) ?
1353 res_id
->name
[3] : policy
->l_extent
.end
);
1355 /* check user's security context */
1356 if (lock
->l_conn_export
&&
1357 sptlrpc_import_check_ctx(
1358 class_exp2cliimp(lock
->l_conn_export
))) {
1359 if (!(flags
& LDLM_FL_TEST_LOCK
))
1360 ldlm_lock_decref_internal(lock
, mode
);
1364 if (flags
& LDLM_FL_TEST_LOCK
)
1365 LDLM_LOCK_RELEASE(lock
);
1367 } else if (!(flags
& LDLM_FL_TEST_LOCK
)) {/*less verbose for test-only*/
1368 LDLM_DEBUG_NOLOCK("not matched ns %p type %u mode %u res "
1369 LPU64
"/"LPU64
" ("LPU64
" "LPU64
")", ns
,
1370 type
, mode
, res_id
->name
[0], res_id
->name
[1],
1371 (type
== LDLM_PLAIN
|| type
== LDLM_IBITS
) ?
1372 res_id
->name
[2] :policy
->l_extent
.start
,
1373 (type
== LDLM_PLAIN
|| type
== LDLM_IBITS
) ?
1374 res_id
->name
[3] : policy
->l_extent
.end
);
1377 LDLM_LOCK_PUT(old_lock
);
1379 return rc
? mode
: 0;
1381 EXPORT_SYMBOL(ldlm_lock_match
);
1383 ldlm_mode_t
ldlm_revalidate_lock_handle(struct lustre_handle
*lockh
,
1386 struct ldlm_lock
*lock
;
1387 ldlm_mode_t mode
= 0;
1389 lock
= ldlm_handle2lock(lockh
);
1391 lock_res_and_lock(lock
);
1392 if (lock
->l_flags
& LDLM_FL_GONE_MASK
)
1395 if (lock
->l_flags
& LDLM_FL_CBPENDING
&&
1396 lock
->l_readers
== 0 && lock
->l_writers
== 0)
1400 *bits
= lock
->l_policy_data
.l_inodebits
.bits
;
1401 mode
= lock
->l_granted_mode
;
1402 ldlm_lock_addref_internal_nolock(lock
, mode
);
1407 unlock_res_and_lock(lock
);
1408 LDLM_LOCK_PUT(lock
);
1412 EXPORT_SYMBOL(ldlm_revalidate_lock_handle
);
1414 /** The caller must guarantee that the buffer is large enough. */
1415 int ldlm_fill_lvb(struct ldlm_lock
*lock
, struct req_capsule
*pill
,
1416 enum req_location loc
, void *data
, int size
)
1420 LASSERT(data
!= NULL
);
1423 switch (lock
->l_lvb_type
) {
1425 if (size
== sizeof(struct ost_lvb
)) {
1426 if (loc
== RCL_CLIENT
)
1427 lvb
= req_capsule_client_swab_get(pill
,
1429 lustre_swab_ost_lvb
);
1431 lvb
= req_capsule_server_swab_get(pill
,
1433 lustre_swab_ost_lvb
);
1434 if (unlikely(lvb
== NULL
)) {
1435 LDLM_ERROR(lock
, "no LVB");
1439 memcpy(data
, lvb
, size
);
1440 } else if (size
== sizeof(struct ost_lvb_v1
)) {
1441 struct ost_lvb
*olvb
= data
;
1443 if (loc
== RCL_CLIENT
)
1444 lvb
= req_capsule_client_swab_get(pill
,
1446 lustre_swab_ost_lvb_v1
);
1448 lvb
= req_capsule_server_sized_swab_get(pill
,
1450 lustre_swab_ost_lvb_v1
);
1451 if (unlikely(lvb
== NULL
)) {
1452 LDLM_ERROR(lock
, "no LVB");
1456 memcpy(data
, lvb
, size
);
1457 olvb
->lvb_mtime_ns
= 0;
1458 olvb
->lvb_atime_ns
= 0;
1459 olvb
->lvb_ctime_ns
= 0;
1461 LDLM_ERROR(lock
, "Replied unexpected ost LVB size %d",
1467 if (size
== sizeof(struct lquota_lvb
)) {
1468 if (loc
== RCL_CLIENT
)
1469 lvb
= req_capsule_client_swab_get(pill
,
1471 lustre_swab_lquota_lvb
);
1473 lvb
= req_capsule_server_swab_get(pill
,
1475 lustre_swab_lquota_lvb
);
1476 if (unlikely(lvb
== NULL
)) {
1477 LDLM_ERROR(lock
, "no LVB");
1481 memcpy(data
, lvb
, size
);
1483 LDLM_ERROR(lock
, "Replied unexpected lquota LVB size %d",
1492 if (loc
== RCL_CLIENT
)
1493 lvb
= req_capsule_client_get(pill
, &RMF_DLM_LVB
);
1495 lvb
= req_capsule_server_get(pill
, &RMF_DLM_LVB
);
1496 if (unlikely(lvb
== NULL
)) {
1497 LDLM_ERROR(lock
, "no LVB");
1501 memcpy(data
, lvb
, size
);
1504 LDLM_ERROR(lock
, "Unknown LVB type: %d\n", lock
->l_lvb_type
);
1513 * Create and fill in new LDLM lock with specified properties.
1514 * Returns a referenced lock
1516 struct ldlm_lock
*ldlm_lock_create(struct ldlm_namespace
*ns
,
1517 const struct ldlm_res_id
*res_id
,
1520 const struct ldlm_callback_suite
*cbs
,
1521 void *data
, __u32 lvb_len
,
1522 enum lvb_type lvb_type
)
1524 struct ldlm_lock
*lock
;
1525 struct ldlm_resource
*res
;
1527 res
= ldlm_resource_get(ns
, NULL
, res_id
, type
, 1);
1531 lock
= ldlm_lock_new(res
);
1536 lock
->l_req_mode
= mode
;
1537 lock
->l_ast_data
= data
;
1538 lock
->l_pid
= current_pid();
1539 if (ns_is_server(ns
))
1540 lock
->l_flags
|= LDLM_FL_NS_SRV
;
1542 lock
->l_blocking_ast
= cbs
->lcs_blocking
;
1543 lock
->l_completion_ast
= cbs
->lcs_completion
;
1544 lock
->l_glimpse_ast
= cbs
->lcs_glimpse
;
1547 lock
->l_tree_node
= NULL
;
1548 /* if this is the extent lock, allocate the interval tree node */
1549 if (type
== LDLM_EXTENT
) {
1550 if (ldlm_interval_alloc(lock
) == NULL
)
1555 lock
->l_lvb_len
= lvb_len
;
1556 OBD_ALLOC(lock
->l_lvb_data
, lvb_len
);
1557 if (lock
->l_lvb_data
== NULL
)
1561 lock
->l_lvb_type
= lvb_type
;
1562 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_NEW_LOCK
))
1568 ldlm_lock_destroy(lock
);
1569 LDLM_LOCK_RELEASE(lock
);
1574 * Enqueue (request) a lock.
1576 * Does not block. As a result of enqueue the lock would be put
1577 * into granted or waiting list.
1579 * If namespace has intent policy sent and the lock has LDLM_FL_HAS_INTENT flag
1580 * set, skip all the enqueueing and delegate lock processing to intent policy
1583 ldlm_error_t
ldlm_lock_enqueue(struct ldlm_namespace
*ns
,
1584 struct ldlm_lock
**lockp
,
1585 void *cookie
, __u64
*flags
)
1587 struct ldlm_lock
*lock
= *lockp
;
1588 struct ldlm_resource
*res
= lock
->l_resource
;
1589 int local
= ns_is_client(ldlm_res_to_ns(res
));
1590 ldlm_error_t rc
= ELDLM_OK
;
1591 struct ldlm_interval
*node
= NULL
;
1593 lock
->l_last_activity
= cfs_time_current_sec();
1594 /* policies are not executed on the client or during replay */
1595 if ((*flags
& (LDLM_FL_HAS_INTENT
|LDLM_FL_REPLAY
)) == LDLM_FL_HAS_INTENT
1596 && !local
&& ns
->ns_policy
) {
1597 rc
= ns
->ns_policy(ns
, lockp
, cookie
, lock
->l_req_mode
, *flags
,
1599 if (rc
== ELDLM_LOCK_REPLACED
) {
1600 /* The lock that was returned has already been granted,
1601 * and placed into lockp. If it's not the same as the
1602 * one we passed in, then destroy the old one and our
1603 * work here is done. */
1604 if (lock
!= *lockp
) {
1605 ldlm_lock_destroy(lock
);
1606 LDLM_LOCK_RELEASE(lock
);
1608 *flags
|= LDLM_FL_LOCK_CHANGED
;
1610 } else if (rc
!= ELDLM_OK
||
1611 (rc
== ELDLM_OK
&& (*flags
& LDLM_FL_INTENT_ONLY
))) {
1612 ldlm_lock_destroy(lock
);
1617 /* For a replaying lock, it might be already in granted list. So
1618 * unlinking the lock will cause the interval node to be freed, we
1619 * have to allocate the interval node early otherwise we can't regrant
1620 * this lock in the future. - jay */
1621 if (!local
&& (*flags
& LDLM_FL_REPLAY
) && res
->lr_type
== LDLM_EXTENT
)
1622 OBD_SLAB_ALLOC_PTR_GFP(node
, ldlm_interval_slab
, __GFP_IO
);
1624 lock_res_and_lock(lock
);
1625 if (local
&& lock
->l_req_mode
== lock
->l_granted_mode
) {
1626 /* The server returned a blocked lock, but it was granted
1627 * before we got a chance to actually enqueue it. We don't
1628 * need to do anything else. */
1629 *flags
&= ~(LDLM_FL_BLOCK_GRANTED
|
1630 LDLM_FL_BLOCK_CONV
| LDLM_FL_BLOCK_WAIT
);
1631 GOTO(out
, ELDLM_OK
);
1634 ldlm_resource_unlink_lock(lock
);
1635 if (res
->lr_type
== LDLM_EXTENT
&& lock
->l_tree_node
== NULL
) {
1637 ldlm_lock_destroy_nolock(lock
);
1638 GOTO(out
, rc
= -ENOMEM
);
1641 INIT_LIST_HEAD(&node
->li_group
);
1642 ldlm_interval_attach(node
, lock
);
1646 /* Some flags from the enqueue want to make it into the AST, via the
1647 * lock's l_flags. */
1648 lock
->l_flags
|= *flags
& LDLM_FL_AST_DISCARD_DATA
;
1650 /* This distinction between local lock trees is very important; a client
1651 * namespace only has information about locks taken by that client, and
1652 * thus doesn't have enough information to decide for itself if it can
1653 * be granted (below). In this case, we do exactly what the server
1654 * tells us to do, as dictated by the 'flags'.
1656 * We do exactly the same thing during recovery, when the server is
1657 * more or less trusting the clients not to lie.
1659 * FIXME (bug 268): Detect obvious lies by checking compatibility in
1660 * granted/converting queues. */
1662 if (*flags
& LDLM_FL_BLOCK_CONV
)
1663 ldlm_resource_add_lock(res
, &res
->lr_converting
, lock
);
1664 else if (*flags
& (LDLM_FL_BLOCK_WAIT
| LDLM_FL_BLOCK_GRANTED
))
1665 ldlm_resource_add_lock(res
, &res
->lr_waiting
, lock
);
1667 ldlm_grant_lock(lock
, NULL
);
1668 GOTO(out
, ELDLM_OK
);
1670 CERROR("This is client-side-only module, cannot handle "
1671 "LDLM_NAMESPACE_SERVER resource type lock.\n");
1676 unlock_res_and_lock(lock
);
1678 OBD_SLAB_FREE(node
, ldlm_interval_slab
, sizeof(*node
));
1684 * Process a call to blocking AST callback for a lock in ast_work list
1687 ldlm_work_bl_ast_lock(struct ptlrpc_request_set
*rqset
, void *opaq
)
1689 struct ldlm_cb_set_arg
*arg
= opaq
;
1690 struct ldlm_lock_desc d
;
1692 struct ldlm_lock
*lock
;
1694 if (list_empty(arg
->list
))
1697 lock
= list_entry(arg
->list
->next
, struct ldlm_lock
, l_bl_ast
);
1699 /* nobody should touch l_bl_ast */
1700 lock_res_and_lock(lock
);
1701 list_del_init(&lock
->l_bl_ast
);
1703 LASSERT(lock
->l_flags
& LDLM_FL_AST_SENT
);
1704 LASSERT(lock
->l_bl_ast_run
== 0);
1705 LASSERT(lock
->l_blocking_lock
);
1706 lock
->l_bl_ast_run
++;
1707 unlock_res_and_lock(lock
);
1709 ldlm_lock2desc(lock
->l_blocking_lock
, &d
);
1711 rc
= lock
->l_blocking_ast(lock
, &d
, (void *)arg
, LDLM_CB_BLOCKING
);
1712 LDLM_LOCK_RELEASE(lock
->l_blocking_lock
);
1713 lock
->l_blocking_lock
= NULL
;
1714 LDLM_LOCK_RELEASE(lock
);
1720 * Process a call to completion AST callback for a lock in ast_work list
1723 ldlm_work_cp_ast_lock(struct ptlrpc_request_set
*rqset
, void *opaq
)
1725 struct ldlm_cb_set_arg
*arg
= opaq
;
1727 struct ldlm_lock
*lock
;
1728 ldlm_completion_callback completion_callback
;
1730 if (list_empty(arg
->list
))
1733 lock
= list_entry(arg
->list
->next
, struct ldlm_lock
, l_cp_ast
);
1735 /* It's possible to receive a completion AST before we've set
1736 * the l_completion_ast pointer: either because the AST arrived
1737 * before the reply, or simply because there's a small race
1738 * window between receiving the reply and finishing the local
1739 * enqueue. (bug 842)
1741 * This can't happen with the blocking_ast, however, because we
1742 * will never call the local blocking_ast until we drop our
1743 * reader/writer reference, which we won't do until we get the
1744 * reply and finish enqueueing. */
1746 /* nobody should touch l_cp_ast */
1747 lock_res_and_lock(lock
);
1748 list_del_init(&lock
->l_cp_ast
);
1749 LASSERT(lock
->l_flags
& LDLM_FL_CP_REQD
);
1750 /* save l_completion_ast since it can be changed by
1751 * mds_intent_policy(), see bug 14225 */
1752 completion_callback
= lock
->l_completion_ast
;
1753 lock
->l_flags
&= ~LDLM_FL_CP_REQD
;
1754 unlock_res_and_lock(lock
);
1756 if (completion_callback
!= NULL
)
1757 rc
= completion_callback(lock
, 0, (void *)arg
);
1758 LDLM_LOCK_RELEASE(lock
);
1764 * Process a call to revocation AST callback for a lock in ast_work list
1767 ldlm_work_revoke_ast_lock(struct ptlrpc_request_set
*rqset
, void *opaq
)
1769 struct ldlm_cb_set_arg
*arg
= opaq
;
1770 struct ldlm_lock_desc desc
;
1772 struct ldlm_lock
*lock
;
1774 if (list_empty(arg
->list
))
1777 lock
= list_entry(arg
->list
->next
, struct ldlm_lock
, l_rk_ast
);
1778 list_del_init(&lock
->l_rk_ast
);
1780 /* the desc just pretend to exclusive */
1781 ldlm_lock2desc(lock
, &desc
);
1782 desc
.l_req_mode
= LCK_EX
;
1783 desc
.l_granted_mode
= 0;
1785 rc
= lock
->l_blocking_ast(lock
, &desc
, (void*)arg
, LDLM_CB_BLOCKING
);
1786 LDLM_LOCK_RELEASE(lock
);
1792 * Process a call to glimpse AST callback for a lock in ast_work list
1794 int ldlm_work_gl_ast_lock(struct ptlrpc_request_set
*rqset
, void *opaq
)
1796 struct ldlm_cb_set_arg
*arg
= opaq
;
1797 struct ldlm_glimpse_work
*gl_work
;
1798 struct ldlm_lock
*lock
;
1801 if (list_empty(arg
->list
))
1804 gl_work
= list_entry(arg
->list
->next
, struct ldlm_glimpse_work
,
1806 list_del_init(&gl_work
->gl_list
);
1808 lock
= gl_work
->gl_lock
;
1810 /* transfer the glimpse descriptor to ldlm_cb_set_arg */
1811 arg
->gl_desc
= gl_work
->gl_desc
;
1813 /* invoke the actual glimpse callback */
1814 if (lock
->l_glimpse_ast(lock
, (void*)arg
) == 0)
1817 LDLM_LOCK_RELEASE(lock
);
1819 if ((gl_work
->gl_flags
& LDLM_GL_WORK_NOFREE
) == 0)
1820 OBD_FREE_PTR(gl_work
);
1826 * Process list of locks in need of ASTs being sent.
1828 * Used on server to send multiple ASTs together instead of sending one by
1831 int ldlm_run_ast_work(struct ldlm_namespace
*ns
, struct list_head
*rpc_list
,
1832 ldlm_desc_ast_t ast_type
)
1834 struct ldlm_cb_set_arg
*arg
;
1835 set_producer_func work_ast_lock
;
1838 if (list_empty(rpc_list
))
1845 atomic_set(&arg
->restart
, 0);
1846 arg
->list
= rpc_list
;
1849 case LDLM_WORK_BL_AST
:
1850 arg
->type
= LDLM_BL_CALLBACK
;
1851 work_ast_lock
= ldlm_work_bl_ast_lock
;
1853 case LDLM_WORK_CP_AST
:
1854 arg
->type
= LDLM_CP_CALLBACK
;
1855 work_ast_lock
= ldlm_work_cp_ast_lock
;
1857 case LDLM_WORK_REVOKE_AST
:
1858 arg
->type
= LDLM_BL_CALLBACK
;
1859 work_ast_lock
= ldlm_work_revoke_ast_lock
;
1861 case LDLM_WORK_GL_AST
:
1862 arg
->type
= LDLM_GL_CALLBACK
;
1863 work_ast_lock
= ldlm_work_gl_ast_lock
;
1869 /* We create a ptlrpc request set with flow control extension.
1870 * This request set will use the work_ast_lock function to produce new
1871 * requests and will send a new request each time one completes in order
1872 * to keep the number of requests in flight to ns_max_parallel_ast */
1873 arg
->set
= ptlrpc_prep_fcset(ns
->ns_max_parallel_ast
? : UINT_MAX
,
1874 work_ast_lock
, arg
);
1875 if (arg
->set
== NULL
)
1876 GOTO(out
, rc
= -ENOMEM
);
1878 ptlrpc_set_wait(arg
->set
);
1879 ptlrpc_set_destroy(arg
->set
);
1881 rc
= atomic_read(&arg
->restart
) ? -ERESTART
: 0;
1888 static int reprocess_one_queue(struct ldlm_resource
*res
, void *closure
)
1890 ldlm_reprocess_all(res
);
1891 return LDLM_ITER_CONTINUE
;
1894 static int ldlm_reprocess_res(cfs_hash_t
*hs
, cfs_hash_bd_t
*bd
,
1895 struct hlist_node
*hnode
, void *arg
)
1897 struct ldlm_resource
*res
= cfs_hash_object(hs
, hnode
);
1900 rc
= reprocess_one_queue(res
, arg
);
1902 return rc
== LDLM_ITER_STOP
;
1906 * Iterate through all resources on a namespace attempting to grant waiting
1909 void ldlm_reprocess_all_ns(struct ldlm_namespace
*ns
)
1912 cfs_hash_for_each_nolock(ns
->ns_rs_hash
,
1913 ldlm_reprocess_res
, NULL
);
1916 EXPORT_SYMBOL(ldlm_reprocess_all_ns
);
1919 * Try to grant all waiting locks on a resource.
1921 * Calls ldlm_reprocess_queue on converting and waiting queues.
1923 * Typically called after some resource locks are cancelled to see
1924 * if anything could be granted as a result of the cancellation.
1926 void ldlm_reprocess_all(struct ldlm_resource
*res
)
1928 LIST_HEAD(rpc_list
);
1930 if (!ns_is_client(ldlm_res_to_ns(res
))) {
1931 CERROR("This is client-side-only module, cannot handle "
1932 "LDLM_NAMESPACE_SERVER resource type lock.\n");
1938 * Helper function to call blocking AST for LDLM lock \a lock in a
1939 * "cancelling" mode.
1941 void ldlm_cancel_callback(struct ldlm_lock
*lock
)
1943 check_res_locked(lock
->l_resource
);
1944 if (!(lock
->l_flags
& LDLM_FL_CANCEL
)) {
1945 lock
->l_flags
|= LDLM_FL_CANCEL
;
1946 if (lock
->l_blocking_ast
) {
1947 unlock_res_and_lock(lock
);
1948 lock
->l_blocking_ast(lock
, NULL
, lock
->l_ast_data
,
1950 lock_res_and_lock(lock
);
1952 LDLM_DEBUG(lock
, "no blocking ast");
1955 lock
->l_flags
|= LDLM_FL_BL_DONE
;
1959 * Remove skiplist-enabled LDLM lock \a req from granted list
1961 void ldlm_unlink_lock_skiplist(struct ldlm_lock
*req
)
1963 if (req
->l_resource
->lr_type
!= LDLM_PLAIN
&&
1964 req
->l_resource
->lr_type
!= LDLM_IBITS
)
1967 list_del_init(&req
->l_sl_policy
);
1968 list_del_init(&req
->l_sl_mode
);
1972 * Attempts to cancel LDLM lock \a lock that has no reader/writer references.
1974 void ldlm_lock_cancel(struct ldlm_lock
*lock
)
1976 struct ldlm_resource
*res
;
1977 struct ldlm_namespace
*ns
;
1979 lock_res_and_lock(lock
);
1981 res
= lock
->l_resource
;
1982 ns
= ldlm_res_to_ns(res
);
1984 /* Please do not, no matter how tempting, remove this LBUG without
1985 * talking to me first. -phik */
1986 if (lock
->l_readers
|| lock
->l_writers
) {
1987 LDLM_ERROR(lock
, "lock still has references");
1991 if (lock
->l_flags
& LDLM_FL_WAITED
)
1992 ldlm_del_waiting_lock(lock
);
1994 /* Releases cancel callback. */
1995 ldlm_cancel_callback(lock
);
1997 /* Yes, second time, just in case it was added again while we were
1998 * running with no res lock in ldlm_cancel_callback */
1999 if (lock
->l_flags
& LDLM_FL_WAITED
)
2000 ldlm_del_waiting_lock(lock
);
2002 ldlm_resource_unlink_lock(lock
);
2003 ldlm_lock_destroy_nolock(lock
);
2005 if (lock
->l_granted_mode
== lock
->l_req_mode
)
2006 ldlm_pool_del(&ns
->ns_pool
, lock
);
2008 /* Make sure we will not be called again for same lock what is possible
2009 * if not to zero out lock->l_granted_mode */
2010 lock
->l_granted_mode
= LCK_MINMODE
;
2011 unlock_res_and_lock(lock
);
2013 EXPORT_SYMBOL(ldlm_lock_cancel
);
2016 * Set opaque data into the lock that only makes sense to upper layer.
2018 int ldlm_lock_set_data(struct lustre_handle
*lockh
, void *data
)
2020 struct ldlm_lock
*lock
= ldlm_handle2lock(lockh
);
2024 if (lock
->l_ast_data
== NULL
)
2025 lock
->l_ast_data
= data
;
2026 if (lock
->l_ast_data
== data
)
2028 LDLM_LOCK_PUT(lock
);
2032 EXPORT_SYMBOL(ldlm_lock_set_data
);
2034 struct export_cl_data
{
2035 struct obd_export
*ecl_exp
;
2040 * Iterator function for ldlm_cancel_locks_for_export.
2041 * Cancels passed locks.
2043 int ldlm_cancel_locks_for_export_cb(cfs_hash_t
*hs
, cfs_hash_bd_t
*bd
,
2044 struct hlist_node
*hnode
, void *data
)
2047 struct export_cl_data
*ecl
= (struct export_cl_data
*)data
;
2048 struct obd_export
*exp
= ecl
->ecl_exp
;
2049 struct ldlm_lock
*lock
= cfs_hash_object(hs
, hnode
);
2050 struct ldlm_resource
*res
;
2052 res
= ldlm_resource_getref(lock
->l_resource
);
2053 LDLM_LOCK_GET(lock
);
2055 LDLM_DEBUG(lock
, "export %p", exp
);
2056 ldlm_res_lvbo_update(res
, NULL
, 1);
2057 ldlm_lock_cancel(lock
);
2058 ldlm_reprocess_all(res
);
2059 ldlm_resource_putref(res
);
2060 LDLM_LOCK_RELEASE(lock
);
2063 if ((ecl
->ecl_loop
& -ecl
->ecl_loop
) == ecl
->ecl_loop
) {
2065 "Cancel lock %p for export %p (loop %d), still have "
2066 "%d locks left on hash table.\n",
2067 lock
, exp
, ecl
->ecl_loop
,
2068 atomic_read(&hs
->hs_count
));
2075 * Cancel all locks for given export.
2077 * Typically called on client disconnection/eviction
2079 void ldlm_cancel_locks_for_export(struct obd_export
*exp
)
2081 struct export_cl_data ecl
= {
2086 cfs_hash_for_each_empty(exp
->exp_lock_hash
,
2087 ldlm_cancel_locks_for_export_cb
, &ecl
);
2091 * Downgrade an exclusive lock.
2093 * A fast variant of ldlm_lock_convert for convertion of exclusive
2094 * locks. The convertion is always successful.
2095 * Used by Commit on Sharing (COS) code.
2097 * \param lock A lock to convert
2098 * \param new_mode new lock mode
2100 void ldlm_lock_downgrade(struct ldlm_lock
*lock
, int new_mode
)
2102 LASSERT(lock
->l_granted_mode
& (LCK_PW
| LCK_EX
));
2103 LASSERT(new_mode
== LCK_COS
);
2105 lock_res_and_lock(lock
);
2106 ldlm_resource_unlink_lock(lock
);
2108 * Remove the lock from pool as it will be added again in
2109 * ldlm_grant_lock() called below.
2111 ldlm_pool_del(&ldlm_lock_to_ns(lock
)->ns_pool
, lock
);
2113 lock
->l_req_mode
= new_mode
;
2114 ldlm_grant_lock(lock
, NULL
);
2115 unlock_res_and_lock(lock
);
2116 ldlm_reprocess_all(lock
->l_resource
);
2118 EXPORT_SYMBOL(ldlm_lock_downgrade
);
2121 * Attempt to convert already granted lock to a different mode.
2123 * While lock conversion is not currently used, future client-side
2124 * optimizations could take advantage of it to avoid discarding cached
2127 struct ldlm_resource
*ldlm_lock_convert(struct ldlm_lock
*lock
, int new_mode
,
2130 LIST_HEAD(rpc_list
);
2131 struct ldlm_resource
*res
;
2132 struct ldlm_namespace
*ns
;
2134 struct ldlm_interval
*node
;
2136 /* Just return if mode is unchanged. */
2137 if (new_mode
== lock
->l_granted_mode
) {
2138 *flags
|= LDLM_FL_BLOCK_GRANTED
;
2139 return lock
->l_resource
;
2142 /* I can't check the type of lock here because the bitlock of lock
2143 * is not held here, so do the allocation blindly. -jay */
2144 OBD_SLAB_ALLOC_PTR_GFP(node
, ldlm_interval_slab
, __GFP_IO
);
2146 /* Actually, this causes EDEADLOCK to be returned */
2149 LASSERTF((new_mode
== LCK_PW
&& lock
->l_granted_mode
== LCK_PR
),
2150 "new_mode %u, granted %u\n", new_mode
, lock
->l_granted_mode
);
2152 lock_res_and_lock(lock
);
2154 res
= lock
->l_resource
;
2155 ns
= ldlm_res_to_ns(res
);
2157 lock
->l_req_mode
= new_mode
;
2158 if (res
->lr_type
== LDLM_PLAIN
|| res
->lr_type
== LDLM_IBITS
) {
2159 ldlm_resource_unlink_lock(lock
);
2161 ldlm_resource_unlink_lock(lock
);
2162 if (res
->lr_type
== LDLM_EXTENT
) {
2163 /* FIXME: ugly code, I have to attach the lock to a
2164 * interval node again since perhaps it will be granted
2166 INIT_LIST_HEAD(&node
->li_group
);
2167 ldlm_interval_attach(node
, lock
);
2173 * Remove old lock from the pool before adding the lock with new
2174 * mode below in ->policy()
2176 ldlm_pool_del(&ns
->ns_pool
, lock
);
2178 /* If this is a local resource, put it on the appropriate list. */
2179 if (ns_is_client(ldlm_res_to_ns(res
))) {
2180 if (*flags
& (LDLM_FL_BLOCK_CONV
| LDLM_FL_BLOCK_GRANTED
)) {
2181 ldlm_resource_add_lock(res
, &res
->lr_converting
, lock
);
2183 /* This should never happen, because of the way the
2184 * server handles conversions. */
2185 LDLM_ERROR(lock
, "Erroneous flags %x on local lock\n",
2189 ldlm_grant_lock(lock
, &rpc_list
);
2191 /* FIXME: completion handling not with lr_lock held ! */
2192 if (lock
->l_completion_ast
)
2193 lock
->l_completion_ast(lock
, 0, NULL
);
2196 CERROR("This is client-side-only module, cannot handle "
2197 "LDLM_NAMESPACE_SERVER resource type lock.\n");
2200 unlock_res_and_lock(lock
);
2203 ldlm_run_ast_work(ns
, &rpc_list
, LDLM_WORK_CP_AST
);
2205 OBD_SLAB_FREE(node
, ldlm_interval_slab
, sizeof(*node
));
2208 EXPORT_SYMBOL(ldlm_lock_convert
);
2211 * Print lock with lock handle \a lockh description into debug log.
2213 * Used when printing all locks on a resource for debug purposes.
2215 void ldlm_lock_dump_handle(int level
, struct lustre_handle
*lockh
)
2217 struct ldlm_lock
*lock
;
2219 if (!((libcfs_debug
| D_ERROR
) & level
))
2222 lock
= ldlm_handle2lock(lockh
);
2226 LDLM_DEBUG_LIMIT(level
, lock
, "###");
2228 LDLM_LOCK_PUT(lock
);
2230 EXPORT_SYMBOL(ldlm_lock_dump_handle
);
2233 * Print lock information with custom message into debug log.
2236 void _ldlm_lock_debug(struct ldlm_lock
*lock
,
2237 struct libcfs_debug_msg_data
*msgdata
,
2238 const char *fmt
, ...)
2241 struct obd_export
*exp
= lock
->l_export
;
2242 struct ldlm_resource
*resource
= lock
->l_resource
;
2243 char *nid
= "local";
2245 va_start(args
, fmt
);
2247 if (exp
&& exp
->exp_connection
) {
2248 nid
= libcfs_nid2str(exp
->exp_connection
->c_peer
.nid
);
2249 } else if (exp
&& exp
->exp_obd
!= NULL
) {
2250 struct obd_import
*imp
= exp
->exp_obd
->u
.cli
.cl_import
;
2251 nid
= libcfs_nid2str(imp
->imp_connection
->c_peer
.nid
);
2254 if (resource
== NULL
) {
2255 libcfs_debug_vmsg2(msgdata
, fmt
, args
,
2256 " ns: \?\? lock: %p/"LPX64
" lrc: %d/%d,%d mode: %s/%s "
2257 "res: \?\? rrc=\?\? type: \?\?\? flags: "LPX64
" nid: %s "
2258 "remote: "LPX64
" expref: %d pid: %u timeout: %lu "
2261 lock
->l_handle
.h_cookie
, atomic_read(&lock
->l_refc
),
2262 lock
->l_readers
, lock
->l_writers
,
2263 ldlm_lockname
[lock
->l_granted_mode
],
2264 ldlm_lockname
[lock
->l_req_mode
],
2265 lock
->l_flags
, nid
, lock
->l_remote_handle
.cookie
,
2266 exp
? atomic_read(&exp
->exp_refcount
) : -99,
2267 lock
->l_pid
, lock
->l_callback_timeout
, lock
->l_lvb_type
);
2272 switch (resource
->lr_type
) {
2274 libcfs_debug_vmsg2(msgdata
, fmt
, args
,
2275 " ns: %s lock: %p/"LPX64
" lrc: %d/%d,%d mode: %s/%s "
2276 "res: "DLDLMRES
" rrc: %d type: %s ["LPU64
"->"LPU64
"] "
2277 "(req "LPU64
"->"LPU64
") flags: "LPX64
" nid: %s remote: "
2278 LPX64
" expref: %d pid: %u timeout: %lu lvb_type: %d\n",
2279 ldlm_lock_to_ns_name(lock
), lock
,
2280 lock
->l_handle
.h_cookie
, atomic_read(&lock
->l_refc
),
2281 lock
->l_readers
, lock
->l_writers
,
2282 ldlm_lockname
[lock
->l_granted_mode
],
2283 ldlm_lockname
[lock
->l_req_mode
],
2285 atomic_read(&resource
->lr_refcount
),
2286 ldlm_typename
[resource
->lr_type
],
2287 lock
->l_policy_data
.l_extent
.start
,
2288 lock
->l_policy_data
.l_extent
.end
,
2289 lock
->l_req_extent
.start
, lock
->l_req_extent
.end
,
2290 lock
->l_flags
, nid
, lock
->l_remote_handle
.cookie
,
2291 exp
? atomic_read(&exp
->exp_refcount
) : -99,
2292 lock
->l_pid
, lock
->l_callback_timeout
,
2297 libcfs_debug_vmsg2(msgdata
, fmt
, args
,
2298 " ns: %s lock: %p/"LPX64
" lrc: %d/%d,%d mode: %s/%s "
2299 "res: "DLDLMRES
" rrc: %d type: %s pid: %d "
2300 "["LPU64
"->"LPU64
"] flags: "LPX64
" nid: %s "
2301 "remote: "LPX64
" expref: %d pid: %u timeout: %lu\n",
2302 ldlm_lock_to_ns_name(lock
), lock
,
2303 lock
->l_handle
.h_cookie
, atomic_read(&lock
->l_refc
),
2304 lock
->l_readers
, lock
->l_writers
,
2305 ldlm_lockname
[lock
->l_granted_mode
],
2306 ldlm_lockname
[lock
->l_req_mode
],
2308 atomic_read(&resource
->lr_refcount
),
2309 ldlm_typename
[resource
->lr_type
],
2310 lock
->l_policy_data
.l_flock
.pid
,
2311 lock
->l_policy_data
.l_flock
.start
,
2312 lock
->l_policy_data
.l_flock
.end
,
2313 lock
->l_flags
, nid
, lock
->l_remote_handle
.cookie
,
2314 exp
? atomic_read(&exp
->exp_refcount
) : -99,
2315 lock
->l_pid
, lock
->l_callback_timeout
);
2319 libcfs_debug_vmsg2(msgdata
, fmt
, args
,
2320 " ns: %s lock: %p/"LPX64
" lrc: %d/%d,%d mode: %s/%s "
2321 "res: "DLDLMRES
" bits "LPX64
" rrc: %d type: %s "
2322 "flags: "LPX64
" nid: %s remote: "LPX64
" expref: %d "
2323 "pid: %u timeout: %lu lvb_type: %d\n",
2324 ldlm_lock_to_ns_name(lock
),
2325 lock
, lock
->l_handle
.h_cookie
,
2326 atomic_read(&lock
->l_refc
),
2327 lock
->l_readers
, lock
->l_writers
,
2328 ldlm_lockname
[lock
->l_granted_mode
],
2329 ldlm_lockname
[lock
->l_req_mode
],
2331 lock
->l_policy_data
.l_inodebits
.bits
,
2332 atomic_read(&resource
->lr_refcount
),
2333 ldlm_typename
[resource
->lr_type
],
2334 lock
->l_flags
, nid
, lock
->l_remote_handle
.cookie
,
2335 exp
? atomic_read(&exp
->exp_refcount
) : -99,
2336 lock
->l_pid
, lock
->l_callback_timeout
,
2341 libcfs_debug_vmsg2(msgdata
, fmt
, args
,
2342 " ns: %s lock: %p/"LPX64
" lrc: %d/%d,%d mode: %s/%s "
2343 "res: "DLDLMRES
" rrc: %d type: %s flags: "LPX64
" "
2344 "nid: %s remote: "LPX64
" expref: %d pid: %u "
2345 "timeout: %lu lvb_type: %d\n",
2346 ldlm_lock_to_ns_name(lock
),
2347 lock
, lock
->l_handle
.h_cookie
,
2348 atomic_read(&lock
->l_refc
),
2349 lock
->l_readers
, lock
->l_writers
,
2350 ldlm_lockname
[lock
->l_granted_mode
],
2351 ldlm_lockname
[lock
->l_req_mode
],
2353 atomic_read(&resource
->lr_refcount
),
2354 ldlm_typename
[resource
->lr_type
],
2355 lock
->l_flags
, nid
, lock
->l_remote_handle
.cookie
,
2356 exp
? atomic_read(&exp
->exp_refcount
) : -99,
2357 lock
->l_pid
, lock
->l_callback_timeout
,
2363 EXPORT_SYMBOL(_ldlm_lock_debug
);