1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2002 Cluster File Systems, Inc.
5 * Author: Peter Braam <braam@clusterfs.com>
6 * Author: Phil Schwan <phil@clusterfs.com>
8 * This file is part of Lustre, http://www.lustre.org.
10 * Lustre is free software; you can redistribute it and/or
11 * modify it under the terms of version 2 of the GNU General Public
12 * License as published by the Free Software Foundation.
14 * Lustre is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with Lustre; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #define DEBUG_SUBSYSTEM S_LDLM
26 #include <linux/slab.h>
27 #include <linux/module.h>
28 #include <linux/random.h>
29 #include <linux/lustre_dlm.h>
30 #include <linux/lustre_mds.h>
31 #include <linux/obd_class.h>
33 /* this lock protects ldlm_handle2lock's integrity */
34 static spinlock_t ldlm_handle_lock = SPIN_LOCK_UNLOCKED;
37 char *ldlm_lockname[] = {
46 char *ldlm_typename[] = {
49 [LDLM_MDSINTENT] "INT"
52 char *ldlm_it2str(int it)
59 case (IT_OPEN | IT_CREAT):
90 CERROR("Unknown intent %d\n", it);
95 extern kmem_cache_t *ldlm_lock_slab;
97 static int ldlm_plain_compat(struct ldlm_lock *a, struct ldlm_lock *b);
99 ldlm_res_compat ldlm_res_compat_table[] = {
100 [LDLM_PLAIN] ldlm_plain_compat,
101 [LDLM_EXTENT] ldlm_extent_compat,
102 [LDLM_MDSINTENT] ldlm_plain_compat
105 ldlm_res_policy ldlm_res_policy_table[] = {
107 [LDLM_EXTENT] ldlm_extent_policy,
108 [LDLM_MDSINTENT] NULL
111 void ldlm_register_intent(int (*arg) (struct ldlm_lock * lock, void *req_cookie,
112 ldlm_mode_t mode, void *data))
114 ldlm_res_policy_table[LDLM_MDSINTENT] = arg;
117 void ldlm_unregister_intent(void)
119 ldlm_res_policy_table[LDLM_MDSINTENT] = NULL;
123 * REFCOUNTED LOCK OBJECTS
128 * Lock refcounts, during creation:
129 * - one special one for allocation, dec'd only once in destroy
130 * - one for being a lock that's in-use
131 * - one for the addref associated with a new lock
133 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock)
135 l_lock(&lock->l_resource->lr_namespace->ns_lock);
137 ldlm_resource_getref(lock->l_resource);
138 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
142 void ldlm_lock_put(struct ldlm_lock *lock)
144 struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
147 l_lock(&ns->ns_lock);
149 //LDLM_DEBUG(lock, "after refc--");
150 if (lock->l_refc < 0)
153 if (ldlm_resource_put(lock->l_resource))
154 lock->l_resource = NULL;
156 LDLM_LOCK_PUT(lock->l_parent);
158 if (lock->l_refc == 0 && (lock->l_flags & LDLM_FL_DESTROYED)) {
159 l_unlock(&ns->ns_lock);
160 LDLM_DEBUG(lock, "final lock_put on destroyed lock, freeing");
162 //spin_lock(&ldlm_handle_lock);
163 spin_lock(&ns->ns_counter_lock);
165 spin_unlock(&ns->ns_counter_lock);
167 lock->l_resource = NULL;
168 if (lock->l_export && lock->l_export->exp_connection)
169 ptlrpc_put_connection(lock->l_export->exp_connection);
170 kmem_cache_free(ldlm_lock_slab, lock);
171 //spin_unlock(&ldlm_handle_lock);
172 CDEBUG(D_MALLOC, "kfreed 'lock': %d at %p (tot 0).\n",
173 sizeof(*lock), lock);
175 l_unlock(&ns->ns_lock);
180 void ldlm_lock_destroy(struct ldlm_lock *lock)
183 l_lock(&lock->l_resource->lr_namespace->ns_lock);
185 if (!list_empty(&lock->l_children)) {
186 LDLM_DEBUG(lock, "still has children (%p)!",
187 lock->l_children.next);
188 ldlm_lock_dump(lock);
191 if (lock->l_readers || lock->l_writers) {
192 LDLM_DEBUG(lock, "lock still has references");
193 ldlm_lock_dump(lock);
197 if (!list_empty(&lock->l_res_link)) {
198 ldlm_lock_dump(lock);
202 if (lock->l_flags & LDLM_FL_DESTROYED) {
203 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
208 list_del(&lock->l_export_chain);
209 lock->l_export = NULL;
210 lock->l_flags |= LDLM_FL_DESTROYED;
212 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
218 usage: pass in a resource on which you have done get
219 pass in a parent lock on which you have done a get
220 do not put the resource or the parent
221 returns: lock with refcount 1
223 static struct ldlm_lock *ldlm_lock_new(struct ldlm_lock *parent,
224 struct ldlm_resource *resource)
226 struct ldlm_lock *lock;
229 if (resource == NULL)
232 lock = kmem_cache_alloc(ldlm_lock_slab, SLAB_KERNEL);
236 memset(lock, 0, sizeof(*lock));
237 get_random_bytes(&lock->l_random, sizeof(__u64));
239 lock->l_resource = resource;
240 /* this refcount matches the one of the resource passed
241 in which is not being put away */
243 INIT_LIST_HEAD(&lock->l_children);
244 INIT_LIST_HEAD(&lock->l_res_link);
245 INIT_LIST_HEAD(&lock->l_export_chain);
246 INIT_LIST_HEAD(&lock->l_pending_chain);
247 init_waitqueue_head(&lock->l_waitq);
249 spin_lock(&resource->lr_namespace->ns_counter_lock);
250 resource->lr_namespace->ns_locks++;
251 spin_unlock(&resource->lr_namespace->ns_counter_lock);
253 if (parent != NULL) {
254 l_lock(&parent->l_resource->lr_namespace->ns_lock);
255 lock->l_parent = parent;
256 list_add(&lock->l_childof, &parent->l_children);
257 l_unlock(&parent->l_resource->lr_namespace->ns_lock);
260 CDEBUG(D_MALLOC, "kmalloced 'lock': %d at "
261 "%p (tot %d).\n", sizeof(*lock), lock, 1);
262 /* this is the extra refcount, to prevent the lock from evaporating */
267 int ldlm_lock_change_resource(struct ldlm_lock *lock, __u64 new_resid[3])
269 struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
270 struct ldlm_resource *oldres = lock->l_resource;
274 l_lock(&ns->ns_lock);
275 if (memcmp(new_resid, lock->l_resource->lr_name,
276 sizeof(lock->l_resource->lr_name)) == 0) {
278 l_unlock(&ns->ns_lock);
282 type = lock->l_resource->lr_type;
283 if (new_resid[0] == 0)
285 lock->l_resource = ldlm_resource_get(ns, NULL, new_resid, type, 1);
286 if (lock->l_resource == NULL) {
291 /* move references over */
292 for (i = 0; i < lock->l_refc; i++) {
294 ldlm_resource_getref(lock->l_resource);
295 rc = ldlm_resource_put(oldres);
296 if (rc == 1 && i != lock->l_refc - 1)
299 /* compensate for the initial get above.. */
300 ldlm_resource_put(lock->l_resource);
302 l_unlock(&ns->ns_lock);
310 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh)
312 lockh->addr = (__u64) (unsigned long)lock;
313 lockh->cookie = lock->l_random;
316 struct ldlm_lock *ldlm_handle2lock(struct lustre_handle *handle)
318 struct ldlm_lock *lock = NULL, *retval = NULL;
321 if (!handle || !handle->addr) {
322 CERROR("bogus handle %p->"LPX64"\n", handle,
323 handle ? handle->addr : -1);
327 //spin_lock(&ldlm_handle_lock);
328 lock = (struct ldlm_lock *)(unsigned long)(handle->addr);
329 if (!kmem_cache_validate(ldlm_lock_slab, (void *)lock)) {
330 CERROR("bogus lock %p\n", lock);
334 if (!lock->l_resource) {
335 CERROR("trying to lock bogus resource: lock %p\n", lock);
336 LDLM_DEBUG(lock, "ldlm_handle2lock(%p)", lock);
339 if (!lock->l_resource->lr_namespace) {
340 CERROR("trying to lock bogus namespace: lock %p\n", lock);
341 LDLM_DEBUG(lock, "ldlm_handle2lock(%p)", lock);
344 if (lock->l_random != handle->cookie) {
345 CERROR("bogus cookie: lock "LPX64", handle "LPX64"\n",
346 lock->l_random, handle->cookie);
350 l_lock(&lock->l_resource->lr_namespace->ns_lock);
351 if (lock->l_flags & LDLM_FL_DESTROYED) {
352 CERROR("lock already destroyed: lock %p\n", lock);
353 LDLM_DEBUG(lock, "ldlm_handle2lock(%p)", lock);
357 retval = LDLM_LOCK_GET(lock);
359 CERROR("lock disappeared below us!!! %p\n", lock);
362 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
364 //spin_unlock(&ldlm_handle_lock);
368 static int ldlm_plain_compat(struct ldlm_lock *a, struct ldlm_lock *b)
370 return lockmode_compat(a->l_req_mode, b->l_req_mode);
373 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc)
375 ldlm_res2desc(lock->l_resource, &desc->l_resource);
376 desc->l_req_mode = lock->l_req_mode;
377 desc->l_granted_mode = lock->l_granted_mode;
378 memcpy(&desc->l_extent, &lock->l_extent, sizeof(desc->l_extent));
379 memcpy(desc->l_version, lock->l_version, sizeof(desc->l_version));
382 static void ldlm_add_ast_work_item(struct ldlm_lock *lock,
383 struct ldlm_lock *new)
385 struct ldlm_ast_work *w;
388 l_lock(&lock->l_resource->lr_namespace->ns_lock);
389 if (new && (lock->l_flags & LDLM_FL_AST_SENT))
392 OBD_ALLOC(w, sizeof(*w));
399 lock->l_flags |= LDLM_FL_AST_SENT;
401 ldlm_lock2desc(new, &w->w_desc);
404 w->w_lock = LDLM_LOCK_GET(lock);
405 list_add(&w->w_list, lock->l_resource->lr_tmp);
407 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
411 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode)
413 struct ldlm_lock *lock;
415 lock = ldlm_handle2lock(lockh);
416 ldlm_lock_addref_internal(lock, mode);
420 /* only called for local locks */
421 void ldlm_lock_addref_internal(struct ldlm_lock *lock, __u32 mode)
423 l_lock(&lock->l_resource->lr_namespace->ns_lock);
424 if (mode == LCK_NL || mode == LCK_CR || mode == LCK_PR)
428 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
430 LDLM_DEBUG(lock, "ldlm_lock_addref(%s)", ldlm_lockname[mode]);
433 /* Args: unlocked lock */
434 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode)
436 struct ldlm_lock *lock = ldlm_handle2lock(lockh);
442 LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
443 l_lock(&lock->l_resource->lr_namespace->ns_lock);
444 if (mode == LCK_NL || mode == LCK_CR || mode == LCK_PR)
449 /* If we received a blocked AST and this was the last reference,
450 * run the callback. */
451 if (!lock->l_readers && !lock->l_writers &&
452 (lock->l_flags & LDLM_FL_CBPENDING)) {
453 if (!lock->l_resource->lr_namespace->ns_client &&
455 CERROR("FL_CBPENDING set on non-local lock--just a "
458 LDLM_DEBUG(lock, "final decref done on cbpending lock");
459 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
461 /* FIXME: need a real 'desc' here */
462 lock->l_blocking_ast(lock, NULL, lock->l_data,
463 lock->l_data_len, LDLM_CB_BLOCKING);
465 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
467 LDLM_LOCK_PUT(lock); /* matches the ldlm_lock_get in addref */
468 LDLM_LOCK_PUT(lock); /* matches the handle2lock above */
473 static int ldlm_lock_compat_list(struct ldlm_lock *lock, int send_cbs,
474 struct list_head *queue)
476 struct list_head *tmp, *pos;
479 list_for_each_safe(tmp, pos, queue) {
480 struct ldlm_lock *child;
481 ldlm_res_compat compat;
483 child = list_entry(tmp, struct ldlm_lock, l_res_link);
487 compat = ldlm_res_compat_table[child->l_resource->lr_type];
488 if (compat && compat(child, lock)) {
489 CDEBUG(D_OTHER, "compat function succeded, next.\n");
492 if (lockmode_compat(child->l_granted_mode, lock->l_req_mode)) {
493 CDEBUG(D_OTHER, "lock modes are compatible, next.\n");
499 if (send_cbs && child->l_blocking_ast != NULL) {
500 CDEBUG(D_OTHER, "lock %p incompatible; sending "
501 "blocking AST.\n", child);
502 ldlm_add_ast_work_item(child, lock);
509 static int ldlm_lock_compat(struct ldlm_lock *lock, int send_cbs)
514 l_lock(&lock->l_resource->lr_namespace->ns_lock);
515 rc = ldlm_lock_compat_list(lock, send_cbs,
516 &lock->l_resource->lr_granted);
517 /* FIXME: should we be sending ASTs to converting? */
519 rc = ldlm_lock_compat_list
520 (lock, send_cbs, &lock->l_resource->lr_converting);
522 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
527 - ldlm_handle_enqueuque - resource
529 void ldlm_grant_lock(struct ldlm_lock *lock)
531 struct ldlm_resource *res = lock->l_resource;
534 l_lock(&lock->l_resource->lr_namespace->ns_lock);
535 ldlm_resource_add_lock(res, &res->lr_granted, lock);
536 lock->l_granted_mode = lock->l_req_mode;
538 if (lock->l_granted_mode < res->lr_most_restr)
539 res->lr_most_restr = lock->l_granted_mode;
541 if (lock->l_completion_ast) {
542 ldlm_add_ast_work_item(lock, NULL);
544 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
548 /* returns a referenced lock or NULL */
549 static struct ldlm_lock *search_queue(struct list_head *queue, ldlm_mode_t mode,
550 struct ldlm_extent *extent)
552 struct ldlm_lock *lock;
553 struct list_head *tmp;
555 list_for_each(tmp, queue) {
556 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
558 if (lock->l_flags & (LDLM_FL_CBPENDING | LDLM_FL_DESTROYED))
561 /* lock_convert() takes the resource lock, so we're sure that
562 * req_mode, lr_type, and l_cookie won't change beneath us */
563 if (lock->l_req_mode != mode)
566 if (lock->l_resource->lr_type == LDLM_EXTENT &&
567 (lock->l_extent.start > extent->start ||
568 lock->l_extent.end < extent->end))
571 ldlm_lock_addref_internal(lock, mode);
578 /* Must be called with no resource or lock locks held.
580 * Returns 1 if it finds an already-existing lock that is compatible; in this
581 * case, lockh is filled in with a addref()ed lock
583 int ldlm_lock_match(struct ldlm_namespace *ns, __u64 * res_id, __u32 type,
584 void *cookie, int cookielen, ldlm_mode_t mode,
585 struct lustre_handle *lockh)
587 struct ldlm_resource *res;
588 struct ldlm_lock *lock;
592 res = ldlm_resource_get(ns, NULL, res_id, type, 0);
596 ns = res->lr_namespace;
597 l_lock(&ns->ns_lock);
599 if ((lock = search_queue(&res->lr_granted, mode, cookie)))
601 if ((lock = search_queue(&res->lr_converting, mode, cookie)))
603 if ((lock = search_queue(&res->lr_waiting, mode, cookie)))
608 ldlm_resource_put(res);
609 l_unlock(&ns->ns_lock);
612 ldlm_lock2handle(lock, lockh);
613 if (lock->l_completion_ast)
614 lock->l_completion_ast(lock, LDLM_FL_WAIT_NOREPROC);
617 LDLM_DEBUG(lock, "matched");
619 LDLM_DEBUG_NOLOCK("not matched");
623 /* Returns a referenced lock */
624 struct ldlm_lock *ldlm_lock_create(struct ldlm_namespace *ns,
625 struct lustre_handle *parent_lock_handle,
626 __u64 * res_id, __u32 type,
627 ldlm_mode_t mode, void *data, __u32 data_len)
629 struct ldlm_resource *res, *parent_res = NULL;
630 struct ldlm_lock *lock, *parent_lock;
632 parent_lock = ldlm_handle2lock(parent_lock_handle);
634 parent_res = parent_lock->l_resource;
636 res = ldlm_resource_get(ns, parent_res, res_id, type, 1);
640 lock = ldlm_lock_new(parent_lock, res);
642 ldlm_resource_put(res);
646 lock->l_req_mode = mode;
648 lock->l_data_len = data_len;
653 /* Must be called with lock->l_lock and lock->l_resource->lr_lock not held */
654 ldlm_error_t ldlm_lock_enqueue(struct ldlm_lock * lock,
655 void *cookie, int cookie_len,
657 ldlm_completion_callback completion,
658 ldlm_blocking_callback blocking)
660 struct ldlm_resource *res;
662 ldlm_res_policy policy;
665 res = lock->l_resource;
666 lock->l_blocking_ast = blocking;
668 if (res->lr_type == LDLM_EXTENT)
669 memcpy(&lock->l_extent, cookie, sizeof(lock->l_extent));
671 /* policies are not executed on the client */
672 local = res->lr_namespace->ns_client;
673 if (!local && (policy = ldlm_res_policy_table[res->lr_type])) {
675 rc = policy(lock, cookie, lock->l_req_mode, NULL);
677 if (rc == ELDLM_LOCK_CHANGED) {
678 res = lock->l_resource;
679 *flags |= LDLM_FL_LOCK_CHANGED;
680 } else if (rc == ELDLM_LOCK_ABORTED) {
681 ldlm_lock_destroy(lock);
686 lock->l_cookie = cookie;
687 lock->l_cookie_len = cookie_len;
689 l_lock(&res->lr_namespace->ns_lock);
690 if (local && lock->l_req_mode == lock->l_granted_mode) {
691 /* The server returned a blocked lock, but it was granted before
692 * we got a chance to actually enqueue it. We don't need to do
694 *flags &= ~(LDLM_FL_BLOCK_GRANTED |
695 LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_WAIT);
699 /* This distinction between local lock trees is very important; a client
700 * namespace only has information about locks taken by that client, and
701 * thus doesn't have enough information to decide for itself if it can
702 * be granted (below). In this case, we do exactly what the server
703 * tells us to do, as dictated by the 'flags' */
704 ldlm_resource_unlink_lock(lock);
706 if (*flags & LDLM_FL_BLOCK_CONV)
707 ldlm_resource_add_lock(res, res->lr_converting.prev,
709 else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
710 ldlm_resource_add_lock(res, res->lr_waiting.prev, lock);
712 ldlm_grant_lock(lock);
716 /* FIXME: We may want to optimize by checking lr_most_restr */
717 if (!list_empty(&res->lr_converting)) {
718 ldlm_resource_add_lock(res, res->lr_waiting.prev, lock);
719 *flags |= LDLM_FL_BLOCK_CONV;
722 if (!list_empty(&res->lr_waiting)) {
723 ldlm_resource_add_lock(res, res->lr_waiting.prev, lock);
724 *flags |= LDLM_FL_BLOCK_WAIT;
727 if (!ldlm_lock_compat(lock, 0)) {
728 ldlm_resource_add_lock(res, res->lr_waiting.prev, lock);
729 *flags |= LDLM_FL_BLOCK_GRANTED;
733 ldlm_grant_lock(lock);
736 l_unlock(&res->lr_namespace->ns_lock);
737 /* Don't set 'completion_ast' until here so that if the lock is granted
738 * immediately we don't do an unnecessary completion call. */
739 lock->l_completion_ast = completion;
743 /* Must be called with namespace taken: queue is waiting or converting. */
744 static int ldlm_reprocess_queue(struct ldlm_resource *res,
745 struct list_head *queue)
747 struct list_head *tmp, *pos;
750 list_for_each_safe(tmp, pos, queue) {
751 struct ldlm_lock *pending;
752 pending = list_entry(tmp, struct ldlm_lock, l_res_link);
754 CDEBUG(D_INFO, "Reprocessing lock %p\n", pending);
756 if (!ldlm_lock_compat(pending, 1))
759 list_del_init(&pending->l_res_link);
760 ldlm_grant_lock(pending);
766 void ldlm_run_ast_work(struct list_head *rpc_list)
768 struct list_head *tmp, *pos;
772 list_for_each_safe(tmp, pos, rpc_list) {
773 struct ldlm_ast_work *w =
774 list_entry(tmp, struct ldlm_ast_work, w_list);
777 rc = w->w_lock->l_blocking_ast
778 (w->w_lock, &w->w_desc, w->w_data,
779 w->w_datalen, LDLM_CB_BLOCKING);
781 rc = w->w_lock->l_completion_ast(w->w_lock, w->w_flags);
783 CERROR("Failed AST - should clean & disconnect "
785 LDLM_LOCK_PUT(w->w_lock);
786 list_del(&w->w_list);
787 OBD_FREE(w, sizeof(*w));
792 /* Must be called with resource->lr_lock not taken. */
793 void ldlm_reprocess_all(struct ldlm_resource *res)
795 struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
798 /* Local lock trees don't get reprocessed. */
799 if (res->lr_namespace->ns_client) {
804 l_lock(&res->lr_namespace->ns_lock);
805 res->lr_tmp = &rpc_list;
807 ldlm_reprocess_queue(res, &res->lr_converting);
808 if (list_empty(&res->lr_converting))
809 ldlm_reprocess_queue(res, &res->lr_waiting);
812 l_unlock(&res->lr_namespace->ns_lock);
814 ldlm_run_ast_work(&rpc_list);
818 void ldlm_cancel_callback(struct ldlm_lock *lock)
820 l_lock(&lock->l_resource->lr_namespace->ns_lock);
821 if (!(lock->l_flags & LDLM_FL_CANCEL)) {
822 lock->l_flags |= LDLM_FL_CANCEL;
823 lock->l_blocking_ast(lock, NULL, lock->l_data,
824 lock->l_data_len, LDLM_CB_CANCELING);
826 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
829 void ldlm_lock_cancel(struct ldlm_lock *lock)
831 struct ldlm_resource *res;
832 struct ldlm_namespace *ns;
835 res = lock->l_resource;
836 ns = res->lr_namespace;
838 l_lock(&ns->ns_lock);
839 if (lock->l_readers || lock->l_writers)
840 CDEBUG(D_INFO, "lock still has references (%d readers, %d "
841 "writers)\n", lock->l_readers, lock->l_writers);
843 ldlm_cancel_callback(lock);
845 ldlm_del_waiting_lock(lock);
846 ldlm_resource_unlink_lock(lock);
847 ldlm_lock_destroy(lock);
848 l_unlock(&ns->ns_lock);
852 void ldlm_cancel_locks_for_export(struct obd_export *exp)
854 struct list_head *iter, *n; /* MUST BE CALLED "n"! */
856 list_for_each_safe(iter, n, &exp->exp_ldlm_data.led_held_locks) {
857 struct ldlm_lock *lock;
858 struct ldlm_resource *res;
859 lock = list_entry(iter, struct ldlm_lock, l_export_chain);
860 res = ldlm_resource_getref(lock->l_resource);
861 LDLM_DEBUG(lock, "cancelling lock for export %p", exp);
862 ldlm_lock_cancel(lock);
863 ldlm_reprocess_all(res);
864 ldlm_resource_put(res);
868 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
871 struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
872 struct ldlm_resource *res;
873 struct ldlm_namespace *ns;
877 res = lock->l_resource;
878 ns = res->lr_namespace;
880 l_lock(&ns->ns_lock);
882 lock->l_req_mode = new_mode;
883 ldlm_resource_unlink_lock(lock);
885 /* If this is a local resource, put it on the appropriate list. */
886 if (res->lr_namespace->ns_client) {
887 if (*flags & (LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_GRANTED))
888 ldlm_resource_add_lock(res, res->lr_converting.prev,
891 /* This should never happen, because of the way the
892 * server handles conversions. */
895 res->lr_tmp = &rpc_list;
896 ldlm_grant_lock(lock);
899 /* FIXME: completion handling not with ns_lock held ! */
900 if (lock->l_completion_ast)
901 lock->l_completion_ast(lock, 0);
904 /* FIXME: We should try the conversion right away and possibly
905 * return success without the need for an extra AST */
906 ldlm_resource_add_lock(res, res->lr_converting.prev, lock);
907 *flags |= LDLM_FL_BLOCK_CONV;
910 l_unlock(&ns->ns_lock);
913 ldlm_run_ast_work(&rpc_list);
917 void ldlm_lock_dump(struct ldlm_lock *lock)
921 if (!(portal_debug & D_OTHER))
924 if (RES_VERSION_SIZE != 4)
928 CDEBUG(D_OTHER, " NULL LDLM lock\n");
932 snprintf(ver, sizeof(ver), "%x %x %x %x",
933 lock->l_version[0], lock->l_version[1],
934 lock->l_version[2], lock->l_version[3]);
936 CDEBUG(D_OTHER, " -- Lock dump: %p (%s)\n", lock, ver);
937 if (lock->l_export && lock->l_export->exp_connection)
938 CDEBUG(D_OTHER, " Node: NID %x (rhandle: "LPX64")\n",
939 lock->l_export->exp_connection->c_peer.peer_nid,
940 lock->l_remote_handle.addr);
942 CDEBUG(D_OTHER, " Node: local\n");
943 CDEBUG(D_OTHER, " Parent: %p\n", lock->l_parent);
944 CDEBUG(D_OTHER, " Resource: %p ("LPD64")\n", lock->l_resource,
945 lock->l_resource->lr_name[0]);
946 CDEBUG(D_OTHER, " Requested mode: %d, granted mode: %d\n",
947 (int)lock->l_req_mode, (int)lock->l_granted_mode);
948 CDEBUG(D_OTHER, " Readers: %u ; Writers; %u\n",
949 lock->l_readers, lock->l_writers);
950 if (lock->l_resource->lr_type == LDLM_EXTENT)
951 CDEBUG(D_OTHER, " Extent: %Lu -> %Lu\n",
952 (unsigned long long)lock->l_extent.start,
953 (unsigned long long)lock->l_extent.end);