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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2010, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/ldlm/ldlm_resource.c
34 * Author: Phil Schwan <phil@clusterfs.com>
35 * Author: Peter Braam <braam@clusterfs.com>
38 #define DEBUG_SUBSYSTEM S_LDLM
39 #include <lustre_dlm.h>
40 #include <lustre_fid.h>
41 #include <obd_class.h>
42 #include "ldlm_internal.h"
44 struct kmem_cache *ldlm_resource_slab, *ldlm_lock_slab;
45 struct kmem_cache *ldlm_interval_tree_slab;
46 struct kmem_cache *ldlm_inodebits_slab;
48 int ldlm_srv_namespace_nr = 0;
49 int ldlm_cli_namespace_nr = 0;
51 DEFINE_MUTEX(ldlm_srv_namespace_lock);
52 LIST_HEAD(ldlm_srv_namespace_list);
54 DEFINE_MUTEX(ldlm_cli_namespace_lock);
55 /* Client Namespaces that have active resources in them.
56 * Once all resources go away, ldlm_poold moves such namespaces to the
58 LIST_HEAD(ldlm_cli_active_namespace_list);
59 /* Client namespaces that don't have any locks in them */
60 LIST_HEAD(ldlm_cli_inactive_namespace_list);
62 static struct dentry *ldlm_debugfs_dir;
63 static struct dentry *ldlm_ns_debugfs_dir;
64 struct dentry *ldlm_svc_debugfs_dir;
66 /* during debug dump certain amount of granted locks for one resource to avoid
68 static unsigned int ldlm_dump_granted_max = 256;
70 static ssize_t ldebugfs_dump_ns_seq_write(struct file *file,
71 const char __user *buffer,
72 size_t count, loff_t *off)
74 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
75 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
79 LDEBUGFS_FOPS_WR_ONLY(ldlm, dump_ns);
81 static int ldlm_rw_uint_seq_show(struct seq_file *m, void *v)
83 seq_printf(m, "%u\n", *(unsigned int *)m->private);
88 ldlm_rw_uint_seq_write(struct file *file, const char __user *buffer,
89 size_t count, loff_t *off)
91 struct seq_file *seq = file->private_data;
96 return kstrtouint_from_user(buffer, count, 0,
97 (unsigned int *)seq->private);
100 LDEBUGFS_SEQ_FOPS(ldlm_rw_uint);
102 #ifdef HAVE_SERVER_SUPPORT
104 static int seq_watermark_show(struct seq_file *m, void *data)
106 seq_printf(m, "%llu\n", *(__u64 *)m->private);
110 static ssize_t seq_watermark_write(struct file *file,
111 const char __user *buffer, size_t count,
116 __u64 *data = ((struct seq_file *)file->private_data)->private;
117 bool wm_low = (data == &ldlm_reclaim_threshold_mb) ? true : false;
120 rc = lprocfs_str_with_units_to_s64(buffer, count, &value, 'M');
122 CERROR("Failed to set %s, rc = %d.\n",
123 wm_low ? "lock_reclaim_threshold_mb" : "lock_limit_mb",
126 } else if (value != 0 && value < (1 << 20)) {
127 CERROR("%s should be greater than 1MB.\n",
128 wm_low ? "lock_reclaim_threshold_mb" : "lock_limit_mb");
131 watermark = value >> 20;
134 if (ldlm_lock_limit_mb != 0 && watermark > ldlm_lock_limit_mb) {
135 CERROR("lock_reclaim_threshold_mb must be smaller than "
141 if (watermark != 0) {
143 do_div(watermark, sizeof(struct ldlm_lock));
145 ldlm_reclaim_threshold = watermark;
147 if (ldlm_reclaim_threshold_mb != 0 &&
148 watermark < ldlm_reclaim_threshold_mb) {
149 CERROR("lock_limit_mb must be greater than "
150 "lock_reclaim_threshold_mb.\n");
155 if (watermark != 0) {
157 do_div(watermark, sizeof(struct ldlm_lock));
159 ldlm_lock_limit = watermark;
165 static int seq_watermark_open(struct inode *inode, struct file *file)
167 return single_open(file, seq_watermark_show, inode->i_private);
170 static const struct file_operations ldlm_watermark_fops = {
171 .owner = THIS_MODULE,
172 .open = seq_watermark_open,
174 .write = seq_watermark_write,
176 .release = lprocfs_single_release,
179 static int seq_granted_show(struct seq_file *m, void *data)
181 seq_printf(m, "%llu\n", percpu_counter_sum_positive(
182 (struct percpu_counter *)m->private));
186 static int seq_granted_open(struct inode *inode, struct file *file)
188 return single_open(file, seq_granted_show, inode->i_private);
191 static const struct file_operations ldlm_granted_fops = {
192 .owner = THIS_MODULE,
193 .open = seq_granted_open,
196 .release = seq_release,
199 #endif /* HAVE_SERVER_SUPPORT */
201 static struct lprocfs_vars ldlm_debugfs_list[] = {
202 { .name = "dump_namespaces",
203 .fops = &ldlm_dump_ns_fops,
205 { .name = "dump_granted_max",
206 .fops = &ldlm_rw_uint_fops,
207 .data = &ldlm_dump_granted_max },
208 #ifdef HAVE_SERVER_SUPPORT
209 { .name = "lock_reclaim_threshold_mb",
210 .fops = &ldlm_watermark_fops,
211 .data = &ldlm_reclaim_threshold_mb },
212 { .name = "lock_limit_mb",
213 .fops = &ldlm_watermark_fops,
214 .data = &ldlm_lock_limit_mb },
215 { .name = "lock_granted_count",
216 .fops = &ldlm_granted_fops,
217 .data = &ldlm_granted_total },
222 int ldlm_debugfs_setup(void)
227 ldlm_debugfs_dir = ldebugfs_register(OBD_LDLM_DEVICENAME,
230 if (IS_ERR_OR_NULL(ldlm_debugfs_dir)) {
231 CERROR("LDebugFS failed in ldlm-init\n");
232 rc = ldlm_debugfs_dir ? PTR_ERR(ldlm_debugfs_dir) : -ENOMEM;
236 ldlm_ns_debugfs_dir = ldebugfs_register("namespaces",
239 if (IS_ERR_OR_NULL(ldlm_ns_debugfs_dir)) {
240 CERROR("LProcFS failed in ldlm-init\n");
241 rc = ldlm_ns_debugfs_dir ? PTR_ERR(ldlm_ns_debugfs_dir)
246 ldlm_svc_debugfs_dir = ldebugfs_register("services",
249 if (IS_ERR_OR_NULL(ldlm_svc_debugfs_dir)) {
250 CERROR("LProcFS failed in ldlm-init\n");
251 rc = ldlm_svc_debugfs_dir ? PTR_ERR(ldlm_svc_debugfs_dir)
256 rc = ldebugfs_add_vars(ldlm_debugfs_dir, ldlm_debugfs_list, NULL);
258 CERROR("LProcFS failed in ldlm-init\n");
265 ldebugfs_remove(&ldlm_svc_debugfs_dir);
267 ldebugfs_remove(&ldlm_ns_debugfs_dir);
269 ldebugfs_remove(&ldlm_debugfs_dir);
271 ldlm_svc_debugfs_dir = NULL;
272 ldlm_ns_debugfs_dir = NULL;
273 ldlm_debugfs_dir = NULL;
277 void ldlm_debugfs_cleanup(void)
279 if (!IS_ERR_OR_NULL(ldlm_svc_debugfs_dir))
280 ldebugfs_remove(&ldlm_svc_debugfs_dir);
282 if (!IS_ERR_OR_NULL(ldlm_ns_debugfs_dir))
283 ldebugfs_remove(&ldlm_ns_debugfs_dir);
285 if (!IS_ERR_OR_NULL(ldlm_debugfs_dir))
286 ldebugfs_remove(&ldlm_debugfs_dir);
288 ldlm_svc_debugfs_dir = NULL;
289 ldlm_ns_debugfs_dir = NULL;
290 ldlm_debugfs_dir = NULL;
293 static ssize_t resource_count_show(struct kobject *kobj, struct attribute *attr,
296 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
299 struct cfs_hash_bd bd;
302 /* result is not strictly consistant */
303 cfs_hash_for_each_bucket(ns->ns_rs_hash, &bd, i)
304 res += cfs_hash_bd_count_get(&bd);
305 return sprintf(buf, "%lld\n", res);
307 LUSTRE_RO_ATTR(resource_count);
309 static ssize_t lock_count_show(struct kobject *kobj, struct attribute *attr,
312 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
316 locks = lprocfs_stats_collector(ns->ns_stats, LDLM_NSS_LOCKS,
317 LPROCFS_FIELDS_FLAGS_SUM);
318 return sprintf(buf, "%lld\n", locks);
320 LUSTRE_RO_ATTR(lock_count);
322 static ssize_t lock_unused_count_show(struct kobject *kobj,
323 struct attribute *attr,
326 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
329 return sprintf(buf, "%d\n", ns->ns_nr_unused);
331 LUSTRE_RO_ATTR(lock_unused_count);
333 static ssize_t lru_size_show(struct kobject *kobj, struct attribute *attr,
336 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
338 __u32 *nr = &ns->ns_max_unused;
340 if (ns_connect_lru_resize(ns))
341 nr = &ns->ns_nr_unused;
342 return sprintf(buf, "%u\n", *nr);
345 static ssize_t lru_size_store(struct kobject *kobj, struct attribute *attr,
346 const char *buffer, size_t count)
348 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
354 if (strncmp(buffer, "clear", 5) == 0) {
356 "dropping all unused locks from namespace %s\n",
358 if (ns_connect_lru_resize(ns)) {
359 /* Try to cancel all @ns_nr_unused locks. */
360 ldlm_cancel_lru(ns, ns->ns_nr_unused, 0,
361 LDLM_LRU_FLAG_PASSED |
362 LDLM_LRU_FLAG_CLEANUP);
364 tmp = ns->ns_max_unused;
365 ns->ns_max_unused = 0;
366 ldlm_cancel_lru(ns, 0, 0, LDLM_LRU_FLAG_PASSED |
367 LDLM_LRU_FLAG_CLEANUP);
368 ns->ns_max_unused = tmp;
373 err = kstrtoul(buffer, 10, &tmp);
375 CERROR("lru_size: invalid value written\n");
378 lru_resize = (tmp == 0);
380 if (ns_connect_lru_resize(ns)) {
382 ns->ns_max_unused = (unsigned int)tmp;
384 if (tmp > ns->ns_nr_unused)
385 tmp = ns->ns_nr_unused;
386 tmp = ns->ns_nr_unused - tmp;
389 "changing namespace %s unused locks from %u to %u\n",
390 ldlm_ns_name(ns), ns->ns_nr_unused,
392 ldlm_cancel_lru(ns, tmp, LCF_ASYNC, LDLM_LRU_FLAG_PASSED);
396 "disable lru_resize for namespace %s\n",
398 ns->ns_connect_flags &= ~OBD_CONNECT_LRU_RESIZE;
402 "changing namespace %s max_unused from %u to %u\n",
403 ldlm_ns_name(ns), ns->ns_max_unused,
405 ns->ns_max_unused = (unsigned int)tmp;
406 ldlm_cancel_lru(ns, 0, LCF_ASYNC, LDLM_LRU_FLAG_PASSED);
408 /* Make sure that LRU resize was originally supported before
409 * turning it on here.
412 (ns->ns_orig_connect_flags & OBD_CONNECT_LRU_RESIZE)) {
414 "enable lru_resize for namespace %s\n",
416 ns->ns_connect_flags |= OBD_CONNECT_LRU_RESIZE;
422 LUSTRE_RW_ATTR(lru_size);
424 static ssize_t lru_max_age_show(struct kobject *kobj, struct attribute *attr,
427 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
430 return sprintf(buf, "%lld\n", ktime_to_ms(ns->ns_max_age));
433 static ssize_t lru_max_age_store(struct kobject *kobj, struct attribute *attr,
434 const char *buffer, size_t count)
436 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
438 int scale = NSEC_PER_MSEC;
439 unsigned long long tmp;
442 /* Did the user ask in seconds or milliseconds. Default is in ms */
443 buf = strstr(buffer, "ms");
445 buf = strchr(buffer, 's');
447 scale = NSEC_PER_SEC;
453 if (kstrtoull(buffer, 10, &tmp))
456 ns->ns_max_age = ktime_set(0, tmp * scale);
460 LUSTRE_RW_ATTR(lru_max_age);
462 static ssize_t early_lock_cancel_show(struct kobject *kobj,
463 struct attribute *attr,
466 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
469 return sprintf(buf, "%d\n", ns_connect_cancelset(ns));
472 static ssize_t early_lock_cancel_store(struct kobject *kobj,
473 struct attribute *attr,
477 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
479 unsigned long supp = -1;
482 rc = kstrtoul(buffer, 10, &supp);
487 ns->ns_connect_flags &= ~OBD_CONNECT_CANCELSET;
488 else if (ns->ns_orig_connect_flags & OBD_CONNECT_CANCELSET)
489 ns->ns_connect_flags |= OBD_CONNECT_CANCELSET;
492 LUSTRE_RW_ATTR(early_lock_cancel);
494 static ssize_t dirty_age_limit_show(struct kobject *kobj,
495 struct attribute *attr, char *buf)
497 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
500 return sprintf(buf, "%llu\n", ns->ns_dirty_age_limit);
503 static ssize_t dirty_age_limit_store(struct kobject *kobj,
504 struct attribute *attr,
505 const char *buffer, size_t count)
507 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
509 unsigned long long tmp;
511 if (kstrtoull(buffer, 10, &tmp))
514 ns->ns_dirty_age_limit = tmp;
518 LUSTRE_RW_ATTR(dirty_age_limit);
520 #ifdef HAVE_SERVER_SUPPORT
521 static ssize_t ctime_age_limit_show(struct kobject *kobj,
522 struct attribute *attr, char *buf)
524 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
527 return sprintf(buf, "%llu\n", ns->ns_ctime_age_limit);
530 static ssize_t ctime_age_limit_store(struct kobject *kobj,
531 struct attribute *attr,
532 const char *buffer, size_t count)
534 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
536 unsigned long long tmp;
538 if (kstrtoull(buffer, 10, &tmp))
541 ns->ns_ctime_age_limit = tmp;
545 LUSTRE_RW_ATTR(ctime_age_limit);
547 static ssize_t lock_timeouts_show(struct kobject *kobj, struct attribute *attr,
550 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
553 return sprintf(buf, "%d\n", ns->ns_timeouts);
555 LUSTRE_RO_ATTR(lock_timeouts);
557 static ssize_t max_nolock_bytes_show(struct kobject *kobj,
558 struct attribute *attr, char *buf)
560 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
563 return sprintf(buf, "%u\n", ns->ns_max_nolock_size);
566 static ssize_t max_nolock_bytes_store(struct kobject *kobj,
567 struct attribute *attr,
568 const char *buffer, size_t count)
570 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
575 err = kstrtoul(buffer, 10, &tmp);
579 ns->ns_max_nolock_size = tmp;
583 LUSTRE_RW_ATTR(max_nolock_bytes);
585 static ssize_t contention_seconds_show(struct kobject *kobj,
586 struct attribute *attr, char *buf)
588 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
591 return sprintf(buf, "%llu\n", ns->ns_contention_time);
594 static ssize_t contention_seconds_store(struct kobject *kobj,
595 struct attribute *attr,
596 const char *buffer, size_t count)
598 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
600 unsigned long long tmp;
602 if (kstrtoull(buffer, 10, &tmp))
605 ns->ns_contention_time = tmp;
609 LUSTRE_RW_ATTR(contention_seconds);
611 static ssize_t contended_locks_show(struct kobject *kobj,
612 struct attribute *attr, char *buf)
614 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
617 return sprintf(buf, "%u\n", ns->ns_contended_locks);
620 static ssize_t contended_locks_store(struct kobject *kobj,
621 struct attribute *attr,
622 const char *buffer, size_t count)
624 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
629 err = kstrtoul(buffer, 10, &tmp);
633 ns->ns_contended_locks = tmp;
637 LUSTRE_RW_ATTR(contended_locks);
639 static ssize_t max_parallel_ast_show(struct kobject *kobj,
640 struct attribute *attr, char *buf)
642 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
645 return sprintf(buf, "%u\n", ns->ns_max_parallel_ast);
648 static ssize_t max_parallel_ast_store(struct kobject *kobj,
649 struct attribute *attr,
650 const char *buffer, size_t count)
652 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
657 err = kstrtoul(buffer, 10, &tmp);
661 ns->ns_max_parallel_ast = tmp;
665 LUSTRE_RW_ATTR(max_parallel_ast);
667 #endif /* HAVE_SERVER_SUPPORT */
669 /* These are for namespaces in /sys/fs/lustre/ldlm/namespaces/ */
670 static struct attribute *ldlm_ns_attrs[] = {
671 &lustre_attr_resource_count.attr,
672 &lustre_attr_lock_count.attr,
673 &lustre_attr_lock_unused_count.attr,
674 &lustre_attr_lru_size.attr,
675 &lustre_attr_lru_max_age.attr,
676 &lustre_attr_early_lock_cancel.attr,
677 &lustre_attr_dirty_age_limit.attr,
678 #ifdef HAVE_SERVER_SUPPORT
679 &lustre_attr_ctime_age_limit.attr,
680 &lustre_attr_lock_timeouts.attr,
681 &lustre_attr_max_nolock_bytes.attr,
682 &lustre_attr_contention_seconds.attr,
683 &lustre_attr_contended_locks.attr,
684 &lustre_attr_max_parallel_ast.attr,
689 static void ldlm_ns_release(struct kobject *kobj)
691 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
693 complete(&ns->ns_kobj_unregister);
696 static struct kobj_type ldlm_ns_ktype = {
697 .default_attrs = ldlm_ns_attrs,
698 .sysfs_ops = &lustre_sysfs_ops,
699 .release = ldlm_ns_release,
702 static void ldlm_namespace_debugfs_unregister(struct ldlm_namespace *ns)
704 if (IS_ERR_OR_NULL(ns->ns_debugfs_entry))
705 CERROR("dlm namespace %s has no procfs dir?\n",
708 ldebugfs_remove(&ns->ns_debugfs_entry);
710 if (ns->ns_stats != NULL)
711 lprocfs_free_stats(&ns->ns_stats);
714 void ldlm_namespace_sysfs_unregister(struct ldlm_namespace *ns)
716 kobject_put(&ns->ns_kobj);
717 wait_for_completion(&ns->ns_kobj_unregister);
720 int ldlm_namespace_sysfs_register(struct ldlm_namespace *ns)
724 ns->ns_kobj.kset = ldlm_ns_kset;
725 init_completion(&ns->ns_kobj_unregister);
726 err = kobject_init_and_add(&ns->ns_kobj, &ldlm_ns_ktype, NULL,
727 "%s", ldlm_ns_name(ns));
729 ns->ns_stats = lprocfs_alloc_stats(LDLM_NSS_LAST, 0);
731 kobject_put(&ns->ns_kobj);
735 lprocfs_counter_init(ns->ns_stats, LDLM_NSS_LOCKS,
736 LPROCFS_CNTR_AVGMINMAX, "locks", "locks");
741 static int ldlm_namespace_debugfs_register(struct ldlm_namespace *ns)
743 struct dentry *ns_entry;
745 if (!IS_ERR_OR_NULL(ns->ns_debugfs_entry)) {
746 ns_entry = ns->ns_debugfs_entry;
748 ns_entry = debugfs_create_dir(ldlm_ns_name(ns),
749 ldlm_ns_debugfs_dir);
752 ns->ns_debugfs_entry = ns_entry;
757 #undef MAX_STRING_SIZE
759 static unsigned ldlm_res_hop_hash(struct cfs_hash *hs,
760 const void *key, unsigned int mask)
762 const struct ldlm_res_id *id = key;
763 unsigned int val = 0;
766 for (i = 0; i < RES_NAME_SIZE; i++)
771 static unsigned ldlm_res_hop_fid_hash(struct cfs_hash *hs,
772 const void *key, unsigned mask)
774 const struct ldlm_res_id *id = key;
779 fid.f_seq = id->name[LUSTRE_RES_ID_SEQ_OFF];
780 fid.f_oid = (__u32)id->name[LUSTRE_RES_ID_VER_OID_OFF];
781 fid.f_ver = (__u32)(id->name[LUSTRE_RES_ID_VER_OID_OFF] >> 32);
783 hash = fid_flatten32(&fid);
784 hash += (hash >> 4) + (hash << 12); /* mixing oid and seq */
785 if (id->name[LUSTRE_RES_ID_HSH_OFF] != 0) {
786 val = id->name[LUSTRE_RES_ID_HSH_OFF];
787 hash += (val >> 5) + (val << 11);
791 hash = hash_long(hash, hs->hs_bkt_bits);
792 /* give me another random factor */
793 hash -= hash_long((unsigned long)hs, val % 11 + 3);
795 hash <<= hs->hs_cur_bits - hs->hs_bkt_bits;
796 hash |= ldlm_res_hop_hash(hs, key, CFS_HASH_NBKT(hs) - 1);
801 static void *ldlm_res_hop_key(struct hlist_node *hnode)
803 struct ldlm_resource *res;
805 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
806 return &res->lr_name;
809 static int ldlm_res_hop_keycmp(const void *key, struct hlist_node *hnode)
811 struct ldlm_resource *res;
813 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
814 return ldlm_res_eq((const struct ldlm_res_id *)key,
815 (const struct ldlm_res_id *)&res->lr_name);
818 static void *ldlm_res_hop_object(struct hlist_node *hnode)
820 return hlist_entry(hnode, struct ldlm_resource, lr_hash);
824 ldlm_res_hop_get_locked(struct cfs_hash *hs, struct hlist_node *hnode)
826 struct ldlm_resource *res;
828 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
829 ldlm_resource_getref(res);
832 static void ldlm_res_hop_put(struct cfs_hash *hs, struct hlist_node *hnode)
834 struct ldlm_resource *res;
836 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
837 ldlm_resource_putref(res);
840 static struct cfs_hash_ops ldlm_ns_hash_ops = {
841 .hs_hash = ldlm_res_hop_hash,
842 .hs_key = ldlm_res_hop_key,
843 .hs_keycmp = ldlm_res_hop_keycmp,
845 .hs_object = ldlm_res_hop_object,
846 .hs_get = ldlm_res_hop_get_locked,
847 .hs_put = ldlm_res_hop_put
850 static struct cfs_hash_ops ldlm_ns_fid_hash_ops = {
851 .hs_hash = ldlm_res_hop_fid_hash,
852 .hs_key = ldlm_res_hop_key,
853 .hs_keycmp = ldlm_res_hop_keycmp,
855 .hs_object = ldlm_res_hop_object,
856 .hs_get = ldlm_res_hop_get_locked,
857 .hs_put = ldlm_res_hop_put
860 typedef struct ldlm_ns_hash_def {
861 enum ldlm_ns_type nsd_type;
862 /** hash bucket bits */
863 unsigned nsd_bkt_bits;
865 unsigned nsd_all_bits;
866 /** hash operations */
867 struct cfs_hash_ops *nsd_hops;
868 } ldlm_ns_hash_def_t;
870 static struct ldlm_ns_hash_def ldlm_ns_hash_defs[] =
873 .nsd_type = LDLM_NS_TYPE_MDC,
876 .nsd_hops = &ldlm_ns_fid_hash_ops,
879 .nsd_type = LDLM_NS_TYPE_MDT,
882 .nsd_hops = &ldlm_ns_fid_hash_ops,
885 .nsd_type = LDLM_NS_TYPE_OSC,
888 .nsd_hops = &ldlm_ns_hash_ops,
891 .nsd_type = LDLM_NS_TYPE_OST,
894 .nsd_hops = &ldlm_ns_hash_ops,
897 .nsd_type = LDLM_NS_TYPE_MGC,
900 .nsd_hops = &ldlm_ns_hash_ops,
903 .nsd_type = LDLM_NS_TYPE_MGT,
906 .nsd_hops = &ldlm_ns_hash_ops,
909 .nsd_type = LDLM_NS_TYPE_UNKNOWN,
914 * Create and initialize new empty namespace.
916 struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
917 enum ldlm_side client,
918 enum ldlm_appetite apt,
919 enum ldlm_ns_type ns_type)
921 struct ldlm_namespace *ns = NULL;
922 struct ldlm_ns_bucket *nsb;
923 struct ldlm_ns_hash_def *nsd;
924 struct cfs_hash_bd bd;
929 LASSERT(obd != NULL);
933 CERROR("ldlm_get_ref failed: %d\n", rc);
937 for (idx = 0; ; idx++) {
938 nsd = &ldlm_ns_hash_defs[idx];
939 if (nsd->nsd_type == LDLM_NS_TYPE_UNKNOWN) {
940 CERROR("Unknown type %d for ns %s\n", ns_type, name);
944 if (nsd->nsd_type == ns_type)
952 ns->ns_rs_hash = cfs_hash_create(name,
953 nsd->nsd_all_bits, nsd->nsd_all_bits,
954 nsd->nsd_bkt_bits, sizeof(*nsb),
960 CFS_HASH_SPIN_BKTLOCK |
961 CFS_HASH_NO_ITEMREF);
962 if (ns->ns_rs_hash == NULL)
965 cfs_hash_for_each_bucket(ns->ns_rs_hash, &bd, idx) {
966 nsb = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
967 at_init(&nsb->nsb_at_estimate, ldlm_enqueue_min, 0);
968 nsb->nsb_namespace = ns;
969 nsb->nsb_reclaim_start = 0;
973 ns->ns_appetite = apt;
974 ns->ns_client = client;
975 ns->ns_name = kstrdup(name, GFP_KERNEL);
979 INIT_LIST_HEAD(&ns->ns_list_chain);
980 INIT_LIST_HEAD(&ns->ns_unused_list);
981 spin_lock_init(&ns->ns_lock);
982 atomic_set(&ns->ns_bref, 0);
983 init_waitqueue_head(&ns->ns_waitq);
985 ns->ns_max_nolock_size = NS_DEFAULT_MAX_NOLOCK_BYTES;
986 ns->ns_contention_time = NS_DEFAULT_CONTENTION_SECONDS;
987 ns->ns_contended_locks = NS_DEFAULT_CONTENDED_LOCKS;
989 ns->ns_max_parallel_ast = LDLM_DEFAULT_PARALLEL_AST_LIMIT;
990 ns->ns_nr_unused = 0;
991 ns->ns_max_unused = LDLM_DEFAULT_LRU_SIZE;
992 ns->ns_max_age = ktime_set(LDLM_DEFAULT_MAX_ALIVE, 0);
993 ns->ns_ctime_age_limit = LDLM_CTIME_AGE_LIMIT;
994 ns->ns_dirty_age_limit = LDLM_DIRTY_AGE_LIMIT;
996 ns->ns_orig_connect_flags = 0;
997 ns->ns_connect_flags = 0;
999 ns->ns_reclaim_start = 0;
1000 ns->ns_last_pos = &ns->ns_unused_list;
1002 rc = ldlm_namespace_sysfs_register(ns);
1004 CERROR("Can't initialize ns sysfs, rc %d\n", rc);
1008 rc = ldlm_namespace_debugfs_register(ns);
1010 CERROR("Can't initialize ns proc, rc %d\n", rc);
1011 GOTO(out_sysfs, rc);
1014 idx = ldlm_namespace_nr_read(client);
1015 rc = ldlm_pool_init(&ns->ns_pool, ns, idx, client);
1017 CERROR("Can't initialize lock pool, rc %d\n", rc);
1021 ldlm_namespace_register(ns, client);
1024 ldlm_namespace_debugfs_unregister(ns);
1026 ldlm_namespace_sysfs_unregister(ns);
1027 ldlm_namespace_cleanup(ns, 0);
1030 cfs_hash_putref(ns->ns_rs_hash);
1037 EXPORT_SYMBOL(ldlm_namespace_new);
1040 * Cancel and destroy all locks on a resource.
1042 * If flags contains FL_LOCAL_ONLY, don't try to tell the server, just
1043 * clean up. This is currently only used for recovery, and we make
1044 * certain assumptions as a result--notably, that we shouldn't cancel
1047 static void cleanup_resource(struct ldlm_resource *res, struct list_head *q,
1050 struct list_head *tmp;
1051 int rc = 0, client = ns_is_client(ldlm_res_to_ns(res));
1052 bool local_only = !!(flags & LDLM_FL_LOCAL_ONLY);
1055 struct ldlm_lock *lock = NULL;
1057 /* First, we look for non-cleaned-yet lock
1058 * all cleaned locks are marked by CLEANED flag. */
1060 list_for_each(tmp, q) {
1061 lock = list_entry(tmp, struct ldlm_lock,
1063 if (ldlm_is_cleaned(lock)) {
1067 LDLM_LOCK_GET(lock);
1068 ldlm_set_cleaned(lock);
1077 /* Set CBPENDING so nothing in the cancellation path
1078 * can match this lock. */
1079 ldlm_set_cbpending(lock);
1080 ldlm_set_failed(lock);
1081 lock->l_flags |= flags;
1083 /* ... without sending a CANCEL message for local_only. */
1085 ldlm_set_local_only(lock);
1087 if (local_only && (lock->l_readers || lock->l_writers)) {
1089 * This is a little bit gross, but much better than the
1090 * alternative: pretend that we got a blocking AST from
1091 * the server, so that when the lock is decref'd, it
1095 LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
1096 if (lock->l_flags & LDLM_FL_FAIL_LOC) {
1097 set_current_state(TASK_UNINTERRUPTIBLE);
1098 schedule_timeout(cfs_time_seconds(4));
1099 set_current_state(TASK_RUNNING);
1101 if (lock->l_completion_ast)
1102 lock->l_completion_ast(lock,
1103 LDLM_FL_FAILED, NULL);
1104 LDLM_LOCK_RELEASE(lock);
1109 struct lustre_handle lockh;
1112 ldlm_lock2handle(lock, &lockh);
1113 rc = ldlm_cli_cancel(&lockh, LCF_LOCAL);
1115 CERROR("ldlm_cli_cancel: %d\n", rc);
1119 "Freeing a lock still held by a client node");
1120 ldlm_lock_cancel(lock);
1122 LDLM_LOCK_RELEASE(lock);
1126 static int ldlm_resource_clean(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1127 struct hlist_node *hnode, void *arg)
1129 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1130 __u64 flags = *(__u64 *)arg;
1132 cleanup_resource(res, &res->lr_granted, flags);
1133 cleanup_resource(res, &res->lr_waiting, flags);
1138 static int ldlm_resource_complain(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1139 struct hlist_node *hnode, void *arg)
1141 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1144 CERROR("%s: namespace resource "DLDLMRES" (%p) refcount nonzero "
1145 "(%d) after lock cleanup; forcing cleanup.\n",
1146 ldlm_ns_name(ldlm_res_to_ns(res)), PLDLMRES(res), res,
1147 atomic_read(&res->lr_refcount) - 1);
1149 /* Use D_NETERROR since it is in the default mask */
1150 ldlm_resource_dump(D_NETERROR, res);
1156 * Cancel and destroy all locks in the namespace.
1158 * Typically used during evictions when server notified client that it was
1159 * evicted and all of its state needs to be destroyed.
1160 * Also used during shutdown.
1162 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, __u64 flags)
1165 CDEBUG(D_INFO, "NULL ns, skipping cleanup\n");
1169 cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_clean,
1171 cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_complain,
1175 EXPORT_SYMBOL(ldlm_namespace_cleanup);
1178 * Attempts to free namespace.
1180 * Only used when namespace goes away, like during an unmount.
1182 static int __ldlm_namespace_free(struct ldlm_namespace *ns, int force)
1186 /* At shutdown time, don't call the cancellation callback */
1187 ldlm_namespace_cleanup(ns, force ? LDLM_FL_LOCAL_ONLY : 0);
1189 if (atomic_read(&ns->ns_bref) > 0) {
1192 "dlm namespace %s free waiting on refcount %d\n",
1193 ldlm_ns_name(ns), atomic_read(&ns->ns_bref));
1196 rc = wait_event_idle_timeout(
1198 atomic_read(&ns->ns_bref) == 0,
1199 cfs_time_seconds(1) / 4);
1201 rc = l_wait_event_abortable(
1202 ns->ns_waitq, atomic_read(&ns->ns_bref) == 0);
1204 /* Forced cleanups should be able to reclaim all references,
1205 * so it's safe to wait forever... we can't leak locks... */
1206 if (force && rc == 0) {
1208 LCONSOLE_ERROR("Forced cleanup waiting for %s "
1209 "namespace with %d resources in use, "
1210 "(rc=%d)\n", ldlm_ns_name(ns),
1211 atomic_read(&ns->ns_bref), rc);
1212 GOTO(force_wait, rc);
1215 if (atomic_read(&ns->ns_bref)) {
1216 LCONSOLE_ERROR("Cleanup waiting for %s namespace "
1217 "with %d resources in use, (rc=%d)\n",
1219 atomic_read(&ns->ns_bref), rc);
1220 RETURN(ELDLM_NAMESPACE_EXISTS);
1222 CDEBUG(D_DLMTRACE, "dlm namespace %s free done waiting\n",
1230 * Performs various cleanups for passed \a ns to make it drop refc and be
1231 * ready for freeing. Waits for refc == 0.
1233 * The following is done:
1234 * (0) Unregister \a ns from its list to make inaccessible for potential
1235 * users like pools thread and others;
1236 * (1) Clear all locks in \a ns.
1238 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
1239 struct obd_import *imp,
1250 spin_lock(&ns->ns_lock);
1251 ns->ns_stopping = 1;
1252 spin_unlock(&ns->ns_lock);
1255 * Can fail with -EINTR when force == 0 in which case try harder.
1257 rc = __ldlm_namespace_free(ns, force);
1258 if (rc != ELDLM_OK) {
1260 ptlrpc_disconnect_import(imp, 0);
1261 ptlrpc_invalidate_import(imp);
1265 * With all requests dropped and the import inactive
1266 * we are gaurenteed all reference will be dropped.
1268 rc = __ldlm_namespace_free(ns, 1);
1273 EXPORT_SYMBOL(ldlm_namespace_free_prior);
1276 * Performs freeing memory structures related to \a ns. This is only done
1277 * when ldlm_namespce_free_prior() successfully removed all resources
1278 * referencing \a ns and its refc == 0.
1280 void ldlm_namespace_free_post(struct ldlm_namespace *ns)
1288 /* Make sure that nobody can find this ns in its list. */
1289 ldlm_namespace_unregister(ns, ns->ns_client);
1290 /* Fini pool _before_ parent proc dir is removed. This is important as
1291 * ldlm_pool_fini() removes own proc dir which is child to @dir.
1292 * Removing it after @dir may cause oops. */
1293 ldlm_pool_fini(&ns->ns_pool);
1295 ldlm_namespace_debugfs_unregister(ns);
1296 ldlm_namespace_sysfs_unregister(ns);
1297 cfs_hash_putref(ns->ns_rs_hash);
1299 /* Namespace \a ns should be not on list at this time, otherwise
1300 * this will cause issues related to using freed \a ns in poold
1303 LASSERT(list_empty(&ns->ns_list_chain));
1308 EXPORT_SYMBOL(ldlm_namespace_free_post);
1311 * Cleanup the resource, and free namespace.
1314 * proc1: destroy import
1315 * class_disconnect_export(grab cl_sem) ->
1316 * -> ldlm_namespace_free ->
1317 * -> lprocfs_remove(grab _lprocfs_lock).
1318 * proc2: read proc info
1319 * lprocfs_fops_read(grab _lprocfs_lock) ->
1320 * -> osc_rd_active, etc(grab cl_sem).
1322 * So that I have to split the ldlm_namespace_free into two parts - the first
1323 * part ldlm_namespace_free_prior is used to cleanup the resource which is
1324 * being used; the 2nd part ldlm_namespace_free_post is used to unregister the
1325 * lprocfs entries, and then free memory. It will be called w/o cli->cl_sem
1328 void ldlm_namespace_free(struct ldlm_namespace *ns,
1329 struct obd_import *imp,
1332 ldlm_namespace_free_prior(ns, imp, force);
1333 ldlm_namespace_free_post(ns);
1335 EXPORT_SYMBOL(ldlm_namespace_free);
1337 void ldlm_namespace_get(struct ldlm_namespace *ns)
1339 atomic_inc(&ns->ns_bref);
1342 /* This is only for callers that care about refcount */
1343 static int ldlm_namespace_get_return(struct ldlm_namespace *ns)
1345 return atomic_inc_return(&ns->ns_bref);
1348 void ldlm_namespace_put(struct ldlm_namespace *ns)
1350 if (atomic_dec_and_lock(&ns->ns_bref, &ns->ns_lock)) {
1351 wake_up(&ns->ns_waitq);
1352 spin_unlock(&ns->ns_lock);
1356 /** Register \a ns in the list of namespaces */
1357 void ldlm_namespace_register(struct ldlm_namespace *ns, enum ldlm_side client)
1359 mutex_lock(ldlm_namespace_lock(client));
1360 LASSERT(list_empty(&ns->ns_list_chain));
1361 list_add(&ns->ns_list_chain, ldlm_namespace_inactive_list(client));
1362 ldlm_namespace_nr_inc(client);
1363 mutex_unlock(ldlm_namespace_lock(client));
1366 /** Unregister \a ns from the list of namespaces. */
1367 void ldlm_namespace_unregister(struct ldlm_namespace *ns, enum ldlm_side client)
1369 mutex_lock(ldlm_namespace_lock(client));
1370 LASSERT(!list_empty(&ns->ns_list_chain));
1371 /* Some asserts and possibly other parts of the code are still
1372 * using list_empty(&ns->ns_list_chain). This is why it is
1373 * important to use list_del_init() here. */
1374 list_del_init(&ns->ns_list_chain);
1375 ldlm_namespace_nr_dec(client);
1376 mutex_unlock(ldlm_namespace_lock(client));
1379 /** Should be called with ldlm_namespace_lock(client) taken. */
1380 void ldlm_namespace_move_to_active_locked(struct ldlm_namespace *ns,
1381 enum ldlm_side client)
1383 LASSERT(!list_empty(&ns->ns_list_chain));
1384 LASSERT(mutex_is_locked(ldlm_namespace_lock(client)));
1385 list_move_tail(&ns->ns_list_chain, ldlm_namespace_list(client));
1388 /** Should be called with ldlm_namespace_lock(client) taken. */
1389 void ldlm_namespace_move_to_inactive_locked(struct ldlm_namespace *ns,
1390 enum ldlm_side client)
1392 LASSERT(!list_empty(&ns->ns_list_chain));
1393 LASSERT(mutex_is_locked(ldlm_namespace_lock(client)));
1394 list_move_tail(&ns->ns_list_chain,
1395 ldlm_namespace_inactive_list(client));
1398 /** Should be called with ldlm_namespace_lock(client) taken. */
1399 struct ldlm_namespace *ldlm_namespace_first_locked(enum ldlm_side client)
1401 LASSERT(mutex_is_locked(ldlm_namespace_lock(client)));
1402 LASSERT(!list_empty(ldlm_namespace_list(client)));
1403 return container_of(ldlm_namespace_list(client)->next,
1404 struct ldlm_namespace, ns_list_chain);
1407 static bool ldlm_resource_extent_new(struct ldlm_resource *res)
1411 OBD_SLAB_ALLOC(res->lr_itree, ldlm_interval_tree_slab,
1412 sizeof(*res->lr_itree) * LCK_MODE_NUM);
1413 if (res->lr_itree == NULL)
1415 /* Initialize interval trees for each lock mode. */
1416 for (idx = 0; idx < LCK_MODE_NUM; idx++) {
1417 res->lr_itree[idx].lit_size = 0;
1418 res->lr_itree[idx].lit_mode = 1 << idx;
1419 res->lr_itree[idx].lit_root = NULL;
1424 static bool ldlm_resource_inodebits_new(struct ldlm_resource *res)
1428 OBD_ALLOC_PTR(res->lr_ibits_queues);
1429 if (res->lr_ibits_queues == NULL)
1431 for (i = 0; i < MDS_INODELOCK_NUMBITS; i++)
1432 INIT_LIST_HEAD(&res->lr_ibits_queues->liq_waiting[i]);
1436 /** Create and initialize new resource. */
1437 static struct ldlm_resource *ldlm_resource_new(enum ldlm_type ldlm_type)
1439 struct ldlm_resource *res;
1442 OBD_SLAB_ALLOC_PTR_GFP(res, ldlm_resource_slab, GFP_NOFS);
1446 switch (ldlm_type) {
1448 rc = ldlm_resource_extent_new(res);
1451 rc = ldlm_resource_inodebits_new(res);
1458 OBD_SLAB_FREE_PTR(res, ldlm_resource_slab);
1462 INIT_LIST_HEAD(&res->lr_granted);
1463 INIT_LIST_HEAD(&res->lr_waiting);
1465 atomic_set(&res->lr_refcount, 1);
1466 spin_lock_init(&res->lr_lock);
1467 lu_ref_init(&res->lr_reference);
1469 /* Since LVB init can be delayed now, there is no longer need to
1470 * immediatelly acquire mutex here. */
1471 mutex_init(&res->lr_lvb_mutex);
1472 res->lr_lvb_initialized = false;
1477 static void ldlm_resource_free(struct ldlm_resource *res)
1479 if (res->lr_type == LDLM_EXTENT) {
1480 if (res->lr_itree != NULL)
1481 OBD_SLAB_FREE(res->lr_itree, ldlm_interval_tree_slab,
1482 sizeof(*res->lr_itree) * LCK_MODE_NUM);
1483 } else if (res->lr_type == LDLM_IBITS) {
1484 if (res->lr_ibits_queues != NULL)
1485 OBD_FREE_PTR(res->lr_ibits_queues);
1488 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1492 * Return a reference to resource with given name, creating it if necessary.
1493 * Args: namespace with ns_lock unlocked
1494 * Locks: takes and releases NS hash-lock and res->lr_lock
1495 * Returns: referenced, unlocked ldlm_resource or NULL
1497 struct ldlm_resource *
1498 ldlm_resource_get(struct ldlm_namespace *ns, struct ldlm_resource *parent,
1499 const struct ldlm_res_id *name, enum ldlm_type type,
1502 struct hlist_node *hnode;
1503 struct ldlm_resource *res = NULL;
1504 struct cfs_hash_bd bd;
1506 int ns_refcount = 0;
1508 LASSERT(ns != NULL);
1509 LASSERT(parent == NULL);
1510 LASSERT(ns->ns_rs_hash != NULL);
1511 LASSERT(name->name[0] != 0);
1513 cfs_hash_bd_get_and_lock(ns->ns_rs_hash, (void *)name, &bd, 0);
1514 hnode = cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1515 if (hnode != NULL) {
1516 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1520 version = cfs_hash_bd_version_get(&bd);
1521 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1524 return ERR_PTR(-ENOENT);
1526 LASSERTF(type >= LDLM_MIN_TYPE && type < LDLM_MAX_TYPE,
1527 "type: %d\n", type);
1528 res = ldlm_resource_new(type);
1530 return ERR_PTR(-ENOMEM);
1532 res->lr_ns_bucket = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
1533 res->lr_name = *name;
1534 res->lr_type = type;
1536 cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
1537 hnode = (version == cfs_hash_bd_version_get(&bd)) ? NULL :
1538 cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1540 if (hnode != NULL) {
1541 /* Someone won the race and already added the resource. */
1542 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1543 /* Clean lu_ref for failed resource. */
1544 lu_ref_fini(&res->lr_reference);
1545 ldlm_resource_free(res);
1547 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
1550 /* We won! Let's add the resource. */
1551 cfs_hash_bd_add_locked(ns->ns_rs_hash, &bd, &res->lr_hash);
1552 if (cfs_hash_bd_count_get(&bd) == 1)
1553 ns_refcount = ldlm_namespace_get_return(ns);
1555 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1557 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CREATE_RESOURCE, 2);
1559 /* Let's see if we happened to be the very first resource in this
1560 * namespace. If so, and this is a client namespace, we need to move
1561 * the namespace into the active namespaces list to be patrolled by
1562 * the ldlm_poold. */
1563 if (ns_is_client(ns) && ns_refcount == 1) {
1564 mutex_lock(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
1565 ldlm_namespace_move_to_active_locked(ns, LDLM_NAMESPACE_CLIENT);
1566 mutex_unlock(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
1571 EXPORT_SYMBOL(ldlm_resource_get);
1573 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res)
1575 LASSERT(res != NULL);
1576 LASSERT(res != LP_POISON);
1577 atomic_inc(&res->lr_refcount);
1578 CDEBUG(D_INFO, "getref res: %p count: %d\n", res,
1579 atomic_read(&res->lr_refcount));
1583 static void __ldlm_resource_putref_final(struct cfs_hash_bd *bd,
1584 struct ldlm_resource *res)
1586 struct ldlm_ns_bucket *nsb = res->lr_ns_bucket;
1588 if (!list_empty(&res->lr_granted)) {
1589 ldlm_resource_dump(D_ERROR, res);
1593 if (!list_empty(&res->lr_waiting)) {
1594 ldlm_resource_dump(D_ERROR, res);
1598 cfs_hash_bd_del_locked(nsb->nsb_namespace->ns_rs_hash,
1600 lu_ref_fini(&res->lr_reference);
1601 if (cfs_hash_bd_count_get(bd) == 0)
1602 ldlm_namespace_put(nsb->nsb_namespace);
1605 /* Returns 1 if the resource was freed, 0 if it remains. */
1606 int ldlm_resource_putref(struct ldlm_resource *res)
1608 struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1609 struct cfs_hash_bd bd;
1611 LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
1612 CDEBUG(D_INFO, "putref res: %p count: %d\n",
1613 res, atomic_read(&res->lr_refcount) - 1);
1615 cfs_hash_bd_get(ns->ns_rs_hash, &res->lr_name, &bd);
1616 if (cfs_hash_bd_dec_and_lock(ns->ns_rs_hash, &bd, &res->lr_refcount)) {
1617 __ldlm_resource_putref_final(&bd, res);
1618 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1619 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
1620 ns->ns_lvbo->lvbo_free(res);
1621 ldlm_resource_free(res);
1626 EXPORT_SYMBOL(ldlm_resource_putref);
1629 * Add a lock into a given resource into specified lock list.
1631 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
1632 struct ldlm_lock *lock)
1634 check_res_locked(res);
1636 LDLM_DEBUG(lock, "About to add this lock");
1638 if (ldlm_is_destroyed(lock)) {
1639 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1643 LASSERT(list_empty(&lock->l_res_link));
1645 list_add_tail(&lock->l_res_link, head);
1647 if (res->lr_type == LDLM_IBITS)
1648 ldlm_inodebits_add_lock(res, head, lock);
1652 * Insert a lock into resource after specified lock.
1654 * Obtain resource description from the lock we are inserting after.
1656 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
1657 struct ldlm_lock *new)
1659 struct ldlm_resource *res = original->l_resource;
1661 check_res_locked(res);
1663 ldlm_resource_dump(D_INFO, res);
1664 LDLM_DEBUG(new, "About to insert this lock after %p: ", original);
1666 if (ldlm_is_destroyed(new)) {
1667 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1671 LASSERT(list_empty(&new->l_res_link));
1673 list_add(&new->l_res_link, &original->l_res_link);
1677 void ldlm_resource_unlink_lock(struct ldlm_lock *lock)
1679 int type = lock->l_resource->lr_type;
1681 check_res_locked(lock->l_resource);
1684 ldlm_unlink_lock_skiplist(lock);
1687 ldlm_extent_unlink_lock(lock);
1690 ldlm_inodebits_unlink_lock(lock);
1693 list_del_init(&lock->l_res_link);
1695 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
1697 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc)
1699 desc->lr_type = res->lr_type;
1700 desc->lr_name = res->lr_name;
1704 * Print information about all locks in all namespaces on this node to debug
1707 void ldlm_dump_all_namespaces(enum ldlm_side client, int level)
1709 struct list_head *tmp;
1711 if (!((libcfs_debug | D_ERROR) & level))
1714 mutex_lock(ldlm_namespace_lock(client));
1716 list_for_each(tmp, ldlm_namespace_list(client)) {
1717 struct ldlm_namespace *ns;
1719 ns = list_entry(tmp, struct ldlm_namespace, ns_list_chain);
1720 ldlm_namespace_dump(level, ns);
1723 mutex_unlock(ldlm_namespace_lock(client));
1726 static int ldlm_res_hash_dump(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1727 struct hlist_node *hnode, void *arg)
1729 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1730 int level = (int)(unsigned long)arg;
1733 ldlm_resource_dump(level, res);
1740 * Print information about all locks in this namespace on this node to debug
1743 void ldlm_namespace_dump(int level, struct ldlm_namespace *ns)
1745 if (!((libcfs_debug | D_ERROR) & level))
1748 CDEBUG(level, "--- Namespace: %s (rc: %d, side: %s)\n",
1749 ldlm_ns_name(ns), atomic_read(&ns->ns_bref),
1750 ns_is_client(ns) ? "client" : "server");
1752 if (ktime_get_seconds() < ns->ns_next_dump)
1755 cfs_hash_for_each_nolock(ns->ns_rs_hash,
1757 (void *)(unsigned long)level, 0);
1758 spin_lock(&ns->ns_lock);
1759 ns->ns_next_dump = ktime_get_seconds() + 10;
1760 spin_unlock(&ns->ns_lock);
1764 * Print information about all locks in this resource to debug log.
1766 void ldlm_resource_dump(int level, struct ldlm_resource *res)
1768 struct ldlm_lock *lock;
1769 unsigned int granted = 0;
1771 CLASSERT(RES_NAME_SIZE == 4);
1773 if (!((libcfs_debug | D_ERROR) & level))
1776 CDEBUG(level, "--- Resource: "DLDLMRES" (%p) refcount = %d\n",
1777 PLDLMRES(res), res, atomic_read(&res->lr_refcount));
1779 if (!list_empty(&res->lr_granted)) {
1780 CDEBUG(level, "Granted locks (in reverse order):\n");
1781 list_for_each_entry_reverse(lock, &res->lr_granted,
1783 LDLM_DEBUG_LIMIT(level, lock, "###");
1784 if (!(level & D_CANTMASK) &&
1785 ++granted > ldlm_dump_granted_max) {
1787 "only dump %d granted locks to avoid DDOS.\n",
1794 if (!list_empty(&res->lr_waiting)) {
1795 CDEBUG(level, "Waiting locks:\n");
1796 list_for_each_entry(lock, &res->lr_waiting, l_res_link)
1797 LDLM_DEBUG_LIMIT(level, lock, "###");
1800 EXPORT_SYMBOL(ldlm_resource_dump);