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;
47 int ldlm_srv_namespace_nr = 0;
48 int ldlm_cli_namespace_nr = 0;
50 DEFINE_MUTEX(ldlm_srv_namespace_lock);
51 LIST_HEAD(ldlm_srv_namespace_list);
53 DEFINE_MUTEX(ldlm_cli_namespace_lock);
54 /* Client Namespaces that have active resources in them.
55 * Once all resources go away, ldlm_poold moves such namespaces to the
57 LIST_HEAD(ldlm_cli_active_namespace_list);
58 /* Client namespaces that don't have any locks in them */
59 LIST_HEAD(ldlm_cli_inactive_namespace_list);
61 static struct dentry *ldlm_debugfs_dir;
62 static struct dentry *ldlm_ns_debugfs_dir;
63 struct dentry *ldlm_svc_debugfs_dir;
65 /* during debug dump certain amount of granted locks for one resource to avoid
67 static unsigned int ldlm_dump_granted_max = 256;
69 static ssize_t ldebugfs_dump_ns_seq_write(struct file *file,
70 const char __user *buffer,
71 size_t count, loff_t *off)
73 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
74 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
78 LDEBUGFS_FOPS_WR_ONLY(ldlm, dump_ns);
80 static int ldlm_rw_uint_seq_show(struct seq_file *m, void *v)
82 seq_printf(m, "%u\n", *(unsigned int *)m->private);
87 ldlm_rw_uint_seq_write(struct file *file, const char __user *buffer,
88 size_t count, loff_t *off)
90 struct seq_file *seq = file->private_data;
95 return kstrtouint_from_user(buffer, count, 0,
96 (unsigned int *)seq->private);
99 LDEBUGFS_SEQ_FOPS(ldlm_rw_uint);
101 #ifdef HAVE_SERVER_SUPPORT
103 static int seq_watermark_show(struct seq_file *m, void *data)
105 seq_printf(m, "%llu\n", *(__u64 *)m->private);
109 static ssize_t seq_watermark_write(struct file *file,
110 const char __user *buffer, size_t count,
115 __u64 *data = ((struct seq_file *)file->private_data)->private;
116 bool wm_low = (data == &ldlm_reclaim_threshold_mb) ? true : false;
119 rc = lprocfs_str_with_units_to_s64(buffer, count, &value, 'M');
121 CERROR("Failed to set %s, rc = %d.\n",
122 wm_low ? "lock_reclaim_threshold_mb" : "lock_limit_mb",
125 } else if (value != 0 && value < (1 << 20)) {
126 CERROR("%s should be greater than 1MB.\n",
127 wm_low ? "lock_reclaim_threshold_mb" : "lock_limit_mb");
130 watermark = value >> 20;
133 if (ldlm_lock_limit_mb != 0 && watermark > ldlm_lock_limit_mb) {
134 CERROR("lock_reclaim_threshold_mb must be smaller than "
140 if (watermark != 0) {
142 do_div(watermark, sizeof(struct ldlm_lock));
144 ldlm_reclaim_threshold = watermark;
146 if (ldlm_reclaim_threshold_mb != 0 &&
147 watermark < ldlm_reclaim_threshold_mb) {
148 CERROR("lock_limit_mb must be greater than "
149 "lock_reclaim_threshold_mb.\n");
154 if (watermark != 0) {
156 do_div(watermark, sizeof(struct ldlm_lock));
158 ldlm_lock_limit = watermark;
164 static int seq_watermark_open(struct inode *inode, struct file *file)
166 return single_open(file, seq_watermark_show, inode->i_private);
169 static const struct file_operations ldlm_watermark_fops = {
170 .owner = THIS_MODULE,
171 .open = seq_watermark_open,
173 .write = seq_watermark_write,
175 .release = lprocfs_single_release,
178 static int seq_granted_show(struct seq_file *m, void *data)
180 seq_printf(m, "%llu\n", percpu_counter_sum_positive(
181 (struct percpu_counter *)m->private));
185 static int seq_granted_open(struct inode *inode, struct file *file)
187 return single_open(file, seq_granted_show, inode->i_private);
190 static const struct file_operations ldlm_granted_fops = {
191 .owner = THIS_MODULE,
192 .open = seq_granted_open,
195 .release = seq_release,
198 #endif /* HAVE_SERVER_SUPPORT */
200 static struct lprocfs_vars ldlm_debugfs_list[] = {
201 { .name = "dump_namespaces",
202 .fops = &ldlm_dump_ns_fops,
204 { .name = "dump_granted_max",
205 .fops = &ldlm_rw_uint_fops,
206 .data = &ldlm_dump_granted_max },
207 #ifdef HAVE_SERVER_SUPPORT
208 { .name = "lock_reclaim_threshold_mb",
209 .fops = &ldlm_watermark_fops,
210 .data = &ldlm_reclaim_threshold_mb },
211 { .name = "lock_limit_mb",
212 .fops = &ldlm_watermark_fops,
213 .data = &ldlm_lock_limit_mb },
214 { .name = "lock_granted_count",
215 .fops = &ldlm_granted_fops,
216 .data = &ldlm_granted_total },
221 int ldlm_debugfs_setup(void)
226 ldlm_debugfs_dir = ldebugfs_register(OBD_LDLM_DEVICENAME,
229 if (IS_ERR_OR_NULL(ldlm_debugfs_dir)) {
230 CERROR("LDebugFS failed in ldlm-init\n");
231 rc = ldlm_debugfs_dir ? PTR_ERR(ldlm_debugfs_dir) : -ENOMEM;
235 ldlm_ns_debugfs_dir = ldebugfs_register("namespaces",
238 if (IS_ERR_OR_NULL(ldlm_ns_debugfs_dir)) {
239 CERROR("LProcFS failed in ldlm-init\n");
240 rc = ldlm_ns_debugfs_dir ? PTR_ERR(ldlm_ns_debugfs_dir)
245 ldlm_svc_debugfs_dir = ldebugfs_register("services",
248 if (IS_ERR_OR_NULL(ldlm_svc_debugfs_dir)) {
249 CERROR("LProcFS failed in ldlm-init\n");
250 rc = ldlm_svc_debugfs_dir ? PTR_ERR(ldlm_svc_debugfs_dir)
255 rc = ldebugfs_add_vars(ldlm_debugfs_dir, ldlm_debugfs_list, NULL);
257 CERROR("LProcFS failed in ldlm-init\n");
264 ldebugfs_remove(&ldlm_svc_debugfs_dir);
266 ldebugfs_remove(&ldlm_ns_debugfs_dir);
268 ldebugfs_remove(&ldlm_debugfs_dir);
270 ldlm_svc_debugfs_dir = NULL;
271 ldlm_ns_debugfs_dir = NULL;
272 ldlm_debugfs_dir = NULL;
276 void ldlm_debugfs_cleanup(void)
278 if (!IS_ERR_OR_NULL(ldlm_svc_debugfs_dir))
279 ldebugfs_remove(&ldlm_svc_debugfs_dir);
281 if (!IS_ERR_OR_NULL(ldlm_ns_debugfs_dir))
282 ldebugfs_remove(&ldlm_ns_debugfs_dir);
284 if (!IS_ERR_OR_NULL(ldlm_debugfs_dir))
285 ldebugfs_remove(&ldlm_debugfs_dir);
287 ldlm_svc_debugfs_dir = NULL;
288 ldlm_ns_debugfs_dir = NULL;
289 ldlm_debugfs_dir = NULL;
292 static ssize_t resource_count_show(struct kobject *kobj, struct attribute *attr,
295 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
298 struct cfs_hash_bd bd;
301 /* result is not strictly consistant */
302 cfs_hash_for_each_bucket(ns->ns_rs_hash, &bd, i)
303 res += cfs_hash_bd_count_get(&bd);
304 return sprintf(buf, "%lld\n", res);
306 LUSTRE_RO_ATTR(resource_count);
308 static ssize_t lock_count_show(struct kobject *kobj, struct attribute *attr,
311 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
315 locks = lprocfs_stats_collector(ns->ns_stats, LDLM_NSS_LOCKS,
316 LPROCFS_FIELDS_FLAGS_SUM);
317 return sprintf(buf, "%lld\n", locks);
319 LUSTRE_RO_ATTR(lock_count);
321 static ssize_t lock_unused_count_show(struct kobject *kobj,
322 struct attribute *attr,
325 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
328 return sprintf(buf, "%d\n", ns->ns_nr_unused);
330 LUSTRE_RO_ATTR(lock_unused_count);
332 static ssize_t lru_size_show(struct kobject *kobj, struct attribute *attr,
335 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
337 __u32 *nr = &ns->ns_max_unused;
339 if (ns_connect_lru_resize(ns))
340 nr = &ns->ns_nr_unused;
341 return sprintf(buf, "%u\n", *nr);
344 static ssize_t lru_size_store(struct kobject *kobj, struct attribute *attr,
345 const char *buffer, size_t count)
347 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
353 if (strncmp(buffer, "clear", 5) == 0) {
355 "dropping all unused locks from namespace %s\n",
357 if (ns_connect_lru_resize(ns)) {
358 /* Try to cancel all @ns_nr_unused locks. */
359 ldlm_cancel_lru(ns, ns->ns_nr_unused, 0,
360 LDLM_LRU_FLAG_PASSED |
361 LDLM_LRU_FLAG_CLEANUP);
363 tmp = ns->ns_max_unused;
364 ns->ns_max_unused = 0;
365 ldlm_cancel_lru(ns, 0, 0, LDLM_LRU_FLAG_PASSED |
366 LDLM_LRU_FLAG_CLEANUP);
367 ns->ns_max_unused = tmp;
372 err = kstrtoul(buffer, 10, &tmp);
374 CERROR("lru_size: invalid value written\n");
377 lru_resize = (tmp == 0);
379 if (ns_connect_lru_resize(ns)) {
381 ns->ns_max_unused = (unsigned int)tmp;
383 if (tmp > ns->ns_nr_unused)
384 tmp = ns->ns_nr_unused;
385 tmp = ns->ns_nr_unused - tmp;
388 "changing namespace %s unused locks from %u to %u\n",
389 ldlm_ns_name(ns), ns->ns_nr_unused,
391 ldlm_cancel_lru(ns, tmp, LCF_ASYNC, LDLM_LRU_FLAG_PASSED);
395 "disable lru_resize for namespace %s\n",
397 ns->ns_connect_flags &= ~OBD_CONNECT_LRU_RESIZE;
401 "changing namespace %s max_unused from %u to %u\n",
402 ldlm_ns_name(ns), ns->ns_max_unused,
404 ns->ns_max_unused = (unsigned int)tmp;
405 ldlm_cancel_lru(ns, 0, LCF_ASYNC, LDLM_LRU_FLAG_PASSED);
407 /* Make sure that LRU resize was originally supported before
408 * turning it on here.
411 (ns->ns_orig_connect_flags & OBD_CONNECT_LRU_RESIZE)) {
413 "enable lru_resize for namespace %s\n",
415 ns->ns_connect_flags |= OBD_CONNECT_LRU_RESIZE;
421 LUSTRE_RW_ATTR(lru_size);
423 static ssize_t lru_max_age_show(struct kobject *kobj, struct attribute *attr,
426 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
429 return sprintf(buf, "%lld\n", ktime_to_ms(ns->ns_max_age));
432 static ssize_t lru_max_age_store(struct kobject *kobj, struct attribute *attr,
433 const char *buffer, size_t count)
435 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
437 int scale = NSEC_PER_MSEC;
438 unsigned long long tmp;
441 /* Did the user ask in seconds or milliseconds. Default is in ms */
442 buf = strstr(buffer, "ms");
444 buf = strchr(buffer, 's');
446 scale = NSEC_PER_SEC;
452 if (kstrtoull(buffer, 10, &tmp))
455 ns->ns_max_age = ktime_set(0, tmp * scale);
459 LUSTRE_RW_ATTR(lru_max_age);
461 static ssize_t early_lock_cancel_show(struct kobject *kobj,
462 struct attribute *attr,
465 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
468 return sprintf(buf, "%d\n", ns_connect_cancelset(ns));
471 static ssize_t early_lock_cancel_store(struct kobject *kobj,
472 struct attribute *attr,
476 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
478 unsigned long supp = -1;
481 rc = kstrtoul(buffer, 10, &supp);
486 ns->ns_connect_flags &= ~OBD_CONNECT_CANCELSET;
487 else if (ns->ns_orig_connect_flags & OBD_CONNECT_CANCELSET)
488 ns->ns_connect_flags |= OBD_CONNECT_CANCELSET;
491 LUSTRE_RW_ATTR(early_lock_cancel);
493 static ssize_t dirty_age_limit_show(struct kobject *kobj,
494 struct attribute *attr, char *buf)
496 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
499 return sprintf(buf, "%llu\n", ns->ns_dirty_age_limit);
502 static ssize_t dirty_age_limit_store(struct kobject *kobj,
503 struct attribute *attr,
504 const char *buffer, size_t count)
506 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
508 unsigned long long tmp;
510 if (kstrtoull(buffer, 10, &tmp))
513 ns->ns_dirty_age_limit = tmp;
517 LUSTRE_RW_ATTR(dirty_age_limit);
519 #ifdef HAVE_SERVER_SUPPORT
520 static ssize_t ctime_age_limit_show(struct kobject *kobj,
521 struct attribute *attr, char *buf)
523 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
526 return sprintf(buf, "%llu\n", ns->ns_ctime_age_limit);
529 static ssize_t ctime_age_limit_store(struct kobject *kobj,
530 struct attribute *attr,
531 const char *buffer, size_t count)
533 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
535 unsigned long long tmp;
537 if (kstrtoull(buffer, 10, &tmp))
540 ns->ns_ctime_age_limit = tmp;
544 LUSTRE_RW_ATTR(ctime_age_limit);
546 static ssize_t lock_timeouts_show(struct kobject *kobj, struct attribute *attr,
549 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
552 return sprintf(buf, "%d\n", ns->ns_timeouts);
554 LUSTRE_RO_ATTR(lock_timeouts);
556 static ssize_t max_nolock_bytes_show(struct kobject *kobj,
557 struct attribute *attr, char *buf)
559 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
562 return sprintf(buf, "%u\n", ns->ns_max_nolock_size);
565 static ssize_t max_nolock_bytes_store(struct kobject *kobj,
566 struct attribute *attr,
567 const char *buffer, size_t count)
569 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
574 err = kstrtoul(buffer, 10, &tmp);
578 ns->ns_max_nolock_size = tmp;
582 LUSTRE_RW_ATTR(max_nolock_bytes);
584 static ssize_t contention_seconds_show(struct kobject *kobj,
585 struct attribute *attr, char *buf)
587 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
590 return sprintf(buf, "%llu\n", ns->ns_contention_time);
593 static ssize_t contention_seconds_store(struct kobject *kobj,
594 struct attribute *attr,
595 const char *buffer, size_t count)
597 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
599 unsigned long long tmp;
601 if (kstrtoull(buffer, 10, &tmp))
604 ns->ns_contention_time = tmp;
608 LUSTRE_RW_ATTR(contention_seconds);
610 static ssize_t contended_locks_show(struct kobject *kobj,
611 struct attribute *attr, char *buf)
613 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
616 return sprintf(buf, "%u\n", ns->ns_contended_locks);
619 static ssize_t contended_locks_store(struct kobject *kobj,
620 struct attribute *attr,
621 const char *buffer, size_t count)
623 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
628 err = kstrtoul(buffer, 10, &tmp);
632 ns->ns_contended_locks = tmp;
636 LUSTRE_RW_ATTR(contended_locks);
638 static ssize_t max_parallel_ast_show(struct kobject *kobj,
639 struct attribute *attr, char *buf)
641 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
644 return sprintf(buf, "%u\n", ns->ns_max_parallel_ast);
647 static ssize_t max_parallel_ast_store(struct kobject *kobj,
648 struct attribute *attr,
649 const char *buffer, size_t count)
651 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
656 err = kstrtoul(buffer, 10, &tmp);
660 ns->ns_max_parallel_ast = tmp;
664 LUSTRE_RW_ATTR(max_parallel_ast);
666 #endif /* HAVE_SERVER_SUPPORT */
668 /* These are for namespaces in /sys/fs/lustre/ldlm/namespaces/ */
669 static struct attribute *ldlm_ns_attrs[] = {
670 &lustre_attr_resource_count.attr,
671 &lustre_attr_lock_count.attr,
672 &lustre_attr_lock_unused_count.attr,
673 &lustre_attr_lru_size.attr,
674 &lustre_attr_lru_max_age.attr,
675 &lustre_attr_early_lock_cancel.attr,
676 &lustre_attr_dirty_age_limit.attr,
677 #ifdef HAVE_SERVER_SUPPORT
678 &lustre_attr_ctime_age_limit.attr,
679 &lustre_attr_lock_timeouts.attr,
680 &lustre_attr_max_nolock_bytes.attr,
681 &lustre_attr_contention_seconds.attr,
682 &lustre_attr_contended_locks.attr,
683 &lustre_attr_max_parallel_ast.attr,
688 static void ldlm_ns_release(struct kobject *kobj)
690 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
692 complete(&ns->ns_kobj_unregister);
695 static struct kobj_type ldlm_ns_ktype = {
696 .default_attrs = ldlm_ns_attrs,
697 .sysfs_ops = &lustre_sysfs_ops,
698 .release = ldlm_ns_release,
701 static void ldlm_namespace_debugfs_unregister(struct ldlm_namespace *ns)
703 if (IS_ERR_OR_NULL(ns->ns_debugfs_entry))
704 CERROR("dlm namespace %s has no procfs dir?\n",
707 ldebugfs_remove(&ns->ns_debugfs_entry);
709 if (ns->ns_stats != NULL)
710 lprocfs_free_stats(&ns->ns_stats);
713 void ldlm_namespace_sysfs_unregister(struct ldlm_namespace *ns)
715 kobject_put(&ns->ns_kobj);
716 wait_for_completion(&ns->ns_kobj_unregister);
719 int ldlm_namespace_sysfs_register(struct ldlm_namespace *ns)
723 ns->ns_kobj.kset = ldlm_ns_kset;
724 init_completion(&ns->ns_kobj_unregister);
725 err = kobject_init_and_add(&ns->ns_kobj, &ldlm_ns_ktype, NULL,
726 "%s", ldlm_ns_name(ns));
728 ns->ns_stats = lprocfs_alloc_stats(LDLM_NSS_LAST, 0);
730 kobject_put(&ns->ns_kobj);
734 lprocfs_counter_init(ns->ns_stats, LDLM_NSS_LOCKS,
735 LPROCFS_CNTR_AVGMINMAX, "locks", "locks");
740 static int ldlm_namespace_debugfs_register(struct ldlm_namespace *ns)
742 struct dentry *ns_entry;
744 if (!IS_ERR_OR_NULL(ns->ns_debugfs_entry)) {
745 ns_entry = ns->ns_debugfs_entry;
747 ns_entry = debugfs_create_dir(ldlm_ns_name(ns),
748 ldlm_ns_debugfs_dir);
751 ns->ns_debugfs_entry = ns_entry;
756 #undef MAX_STRING_SIZE
758 static unsigned ldlm_res_hop_hash(struct cfs_hash *hs,
759 const void *key, unsigned mask)
761 const struct ldlm_res_id *id = key;
765 for (i = 0; i < RES_NAME_SIZE; i++)
770 static unsigned ldlm_res_hop_fid_hash(struct cfs_hash *hs,
771 const void *key, unsigned mask)
773 const struct ldlm_res_id *id = key;
778 fid.f_seq = id->name[LUSTRE_RES_ID_SEQ_OFF];
779 fid.f_oid = (__u32)id->name[LUSTRE_RES_ID_VER_OID_OFF];
780 fid.f_ver = (__u32)(id->name[LUSTRE_RES_ID_VER_OID_OFF] >> 32);
782 hash = fid_flatten32(&fid);
783 hash += (hash >> 4) + (hash << 12); /* mixing oid and seq */
784 if (id->name[LUSTRE_RES_ID_HSH_OFF] != 0) {
785 val = id->name[LUSTRE_RES_ID_HSH_OFF];
786 hash += (val >> 5) + (val << 11);
790 hash = hash_long(hash, hs->hs_bkt_bits);
791 /* give me another random factor */
792 hash -= hash_long((unsigned long)hs, val % 11 + 3);
794 hash <<= hs->hs_cur_bits - hs->hs_bkt_bits;
795 hash |= ldlm_res_hop_hash(hs, key, CFS_HASH_NBKT(hs) - 1);
800 static void *ldlm_res_hop_key(struct hlist_node *hnode)
802 struct ldlm_resource *res;
804 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
805 return &res->lr_name;
808 static int ldlm_res_hop_keycmp(const void *key, struct hlist_node *hnode)
810 struct ldlm_resource *res;
812 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
813 return ldlm_res_eq((const struct ldlm_res_id *)key,
814 (const struct ldlm_res_id *)&res->lr_name);
817 static void *ldlm_res_hop_object(struct hlist_node *hnode)
819 return hlist_entry(hnode, struct ldlm_resource, lr_hash);
823 ldlm_res_hop_get_locked(struct cfs_hash *hs, struct hlist_node *hnode)
825 struct ldlm_resource *res;
827 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
828 ldlm_resource_getref(res);
831 static void ldlm_res_hop_put(struct cfs_hash *hs, struct hlist_node *hnode)
833 struct ldlm_resource *res;
835 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
836 ldlm_resource_putref(res);
839 static struct cfs_hash_ops ldlm_ns_hash_ops = {
840 .hs_hash = ldlm_res_hop_hash,
841 .hs_key = ldlm_res_hop_key,
842 .hs_keycmp = ldlm_res_hop_keycmp,
844 .hs_object = ldlm_res_hop_object,
845 .hs_get = ldlm_res_hop_get_locked,
846 .hs_put = ldlm_res_hop_put
849 static struct cfs_hash_ops ldlm_ns_fid_hash_ops = {
850 .hs_hash = ldlm_res_hop_fid_hash,
851 .hs_key = ldlm_res_hop_key,
852 .hs_keycmp = ldlm_res_hop_keycmp,
854 .hs_object = ldlm_res_hop_object,
855 .hs_get = ldlm_res_hop_get_locked,
856 .hs_put = ldlm_res_hop_put
859 typedef struct ldlm_ns_hash_def {
860 enum ldlm_ns_type nsd_type;
861 /** hash bucket bits */
862 unsigned nsd_bkt_bits;
864 unsigned nsd_all_bits;
865 /** hash operations */
866 struct cfs_hash_ops *nsd_hops;
867 } ldlm_ns_hash_def_t;
869 static struct ldlm_ns_hash_def ldlm_ns_hash_defs[] =
872 .nsd_type = LDLM_NS_TYPE_MDC,
875 .nsd_hops = &ldlm_ns_fid_hash_ops,
878 .nsd_type = LDLM_NS_TYPE_MDT,
881 .nsd_hops = &ldlm_ns_fid_hash_ops,
884 .nsd_type = LDLM_NS_TYPE_OSC,
887 .nsd_hops = &ldlm_ns_hash_ops,
890 .nsd_type = LDLM_NS_TYPE_OST,
893 .nsd_hops = &ldlm_ns_hash_ops,
896 .nsd_type = LDLM_NS_TYPE_MGC,
899 .nsd_hops = &ldlm_ns_hash_ops,
902 .nsd_type = LDLM_NS_TYPE_MGT,
905 .nsd_hops = &ldlm_ns_hash_ops,
908 .nsd_type = LDLM_NS_TYPE_UNKNOWN,
913 * Create and initialize new empty namespace.
915 struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
916 enum ldlm_side client,
917 enum ldlm_appetite apt,
918 enum ldlm_ns_type ns_type)
920 struct ldlm_namespace *ns = NULL;
921 struct ldlm_ns_bucket *nsb;
922 struct ldlm_ns_hash_def *nsd;
923 struct cfs_hash_bd bd;
928 LASSERT(obd != NULL);
932 CERROR("ldlm_get_ref failed: %d\n", rc);
936 for (idx = 0;;idx++) {
937 nsd = &ldlm_ns_hash_defs[idx];
938 if (nsd->nsd_type == LDLM_NS_TYPE_UNKNOWN) {
939 CERROR("Unknown type %d for ns %s\n", ns_type, name);
943 if (nsd->nsd_type == ns_type)
951 ns->ns_rs_hash = cfs_hash_create(name,
952 nsd->nsd_all_bits, nsd->nsd_all_bits,
953 nsd->nsd_bkt_bits, sizeof(*nsb),
959 CFS_HASH_SPIN_BKTLOCK |
960 CFS_HASH_NO_ITEMREF);
961 if (ns->ns_rs_hash == NULL)
964 cfs_hash_for_each_bucket(ns->ns_rs_hash, &bd, idx) {
965 nsb = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
966 at_init(&nsb->nsb_at_estimate, ldlm_enqueue_min, 0);
967 nsb->nsb_namespace = ns;
968 nsb->nsb_reclaim_start = 0;
972 ns->ns_appetite = apt;
973 ns->ns_client = client;
975 INIT_LIST_HEAD(&ns->ns_list_chain);
976 INIT_LIST_HEAD(&ns->ns_unused_list);
977 spin_lock_init(&ns->ns_lock);
978 atomic_set(&ns->ns_bref, 0);
979 init_waitqueue_head(&ns->ns_waitq);
981 ns->ns_max_nolock_size = NS_DEFAULT_MAX_NOLOCK_BYTES;
982 ns->ns_contention_time = NS_DEFAULT_CONTENTION_SECONDS;
983 ns->ns_contended_locks = NS_DEFAULT_CONTENDED_LOCKS;
985 ns->ns_max_parallel_ast = LDLM_DEFAULT_PARALLEL_AST_LIMIT;
986 ns->ns_nr_unused = 0;
987 ns->ns_max_unused = LDLM_DEFAULT_LRU_SIZE;
988 ns->ns_max_age = ktime_set(LDLM_DEFAULT_MAX_ALIVE, 0);
989 ns->ns_ctime_age_limit = LDLM_CTIME_AGE_LIMIT;
990 ns->ns_dirty_age_limit = LDLM_DIRTY_AGE_LIMIT;
992 ns->ns_orig_connect_flags = 0;
993 ns->ns_connect_flags = 0;
995 ns->ns_reclaim_start = 0;
996 ns->ns_last_pos = &ns->ns_unused_list;
998 rc = ldlm_namespace_sysfs_register(ns);
1000 CERROR("Can't initialize ns sysfs, rc %d\n", rc);
1004 rc = ldlm_namespace_debugfs_register(ns);
1006 CERROR("Can't initialize ns proc, rc %d\n", rc);
1007 GOTO(out_sysfs, rc);
1010 idx = ldlm_namespace_nr_read(client);
1011 rc = ldlm_pool_init(&ns->ns_pool, ns, idx, client);
1013 CERROR("Can't initialize lock pool, rc %d\n", rc);
1017 ldlm_namespace_register(ns, client);
1020 ldlm_namespace_debugfs_unregister(ns);
1022 ldlm_namespace_sysfs_unregister(ns);
1023 ldlm_namespace_cleanup(ns, 0);
1025 cfs_hash_putref(ns->ns_rs_hash);
1032 EXPORT_SYMBOL(ldlm_namespace_new);
1034 extern struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
1037 * Cancel and destroy all locks on a resource.
1039 * If flags contains FL_LOCAL_ONLY, don't try to tell the server, just
1040 * clean up. This is currently only used for recovery, and we make
1041 * certain assumptions as a result--notably, that we shouldn't cancel
1044 static void cleanup_resource(struct ldlm_resource *res, struct list_head *q,
1047 struct list_head *tmp;
1048 int rc = 0, client = ns_is_client(ldlm_res_to_ns(res));
1049 bool local_only = !!(flags & LDLM_FL_LOCAL_ONLY);
1052 struct ldlm_lock *lock = NULL;
1054 /* First, we look for non-cleaned-yet lock
1055 * all cleaned locks are marked by CLEANED flag. */
1057 list_for_each(tmp, q) {
1058 lock = list_entry(tmp, struct ldlm_lock,
1060 if (ldlm_is_cleaned(lock)) {
1064 LDLM_LOCK_GET(lock);
1065 ldlm_set_cleaned(lock);
1074 /* Set CBPENDING so nothing in the cancellation path
1075 * can match this lock. */
1076 ldlm_set_cbpending(lock);
1077 ldlm_set_failed(lock);
1078 lock->l_flags |= flags;
1080 /* ... without sending a CANCEL message for local_only. */
1082 ldlm_set_local_only(lock);
1084 if (local_only && (lock->l_readers || lock->l_writers)) {
1085 /* This is a little bit gross, but much better than the
1086 * alternative: pretend that we got a blocking AST from
1087 * the server, so that when the lock is decref'd, it
1088 * will go away ... */
1090 LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
1091 if (lock->l_flags & LDLM_FL_FAIL_LOC) {
1092 set_current_state(TASK_UNINTERRUPTIBLE);
1093 schedule_timeout(cfs_time_seconds(4));
1094 set_current_state(TASK_RUNNING);
1096 if (lock->l_completion_ast)
1097 lock->l_completion_ast(lock,
1098 LDLM_FL_FAILED, NULL);
1099 LDLM_LOCK_RELEASE(lock);
1104 struct lustre_handle lockh;
1107 ldlm_lock2handle(lock, &lockh);
1108 rc = ldlm_cli_cancel(&lockh, LCF_LOCAL);
1110 CERROR("ldlm_cli_cancel: %d\n", rc);
1113 LDLM_DEBUG(lock, "Freeing a lock still held by a "
1115 ldlm_lock_cancel(lock);
1117 LDLM_LOCK_RELEASE(lock);
1121 static int ldlm_resource_clean(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1122 struct hlist_node *hnode, void *arg)
1124 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1125 __u64 flags = *(__u64 *)arg;
1127 cleanup_resource(res, &res->lr_granted, flags);
1128 cleanup_resource(res, &res->lr_waiting, flags);
1133 static int ldlm_resource_complain(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1134 struct hlist_node *hnode, void *arg)
1136 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1139 CERROR("%s: namespace resource "DLDLMRES" (%p) refcount nonzero "
1140 "(%d) after lock cleanup; forcing cleanup.\n",
1141 ldlm_ns_name(ldlm_res_to_ns(res)), PLDLMRES(res), res,
1142 atomic_read(&res->lr_refcount) - 1);
1144 ldlm_resource_dump(D_ERROR, res);
1150 * Cancel and destroy all locks in the namespace.
1152 * Typically used during evictions when server notified client that it was
1153 * evicted and all of its state needs to be destroyed.
1154 * Also used during shutdown.
1156 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, __u64 flags)
1159 CDEBUG(D_INFO, "NULL ns, skipping cleanup\n");
1163 cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_clean,
1165 cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_complain,
1169 EXPORT_SYMBOL(ldlm_namespace_cleanup);
1172 * Attempts to free namespace.
1174 * Only used when namespace goes away, like during an unmount.
1176 static int __ldlm_namespace_free(struct ldlm_namespace *ns, int force)
1180 /* At shutdown time, don't call the cancellation callback */
1181 ldlm_namespace_cleanup(ns, force ? LDLM_FL_LOCAL_ONLY : 0);
1183 if (atomic_read(&ns->ns_bref) > 0) {
1184 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
1187 "dlm namespace %s free waiting on refcount %d\n",
1188 ldlm_ns_name(ns), atomic_read(&ns->ns_bref));
1191 lwi = LWI_TIMEOUT(msecs_to_jiffies(obd_timeout *
1192 MSEC_PER_SEC) / 4, NULL, NULL);
1194 rc = l_wait_event(ns->ns_waitq,
1195 atomic_read(&ns->ns_bref) == 0, &lwi);
1197 /* Forced cleanups should be able to reclaim all references,
1198 * so it's safe to wait forever... we can't leak locks... */
1199 if (force && rc == -ETIMEDOUT) {
1200 LCONSOLE_ERROR("Forced cleanup waiting for %s "
1201 "namespace with %d resources in use, "
1202 "(rc=%d)\n", ldlm_ns_name(ns),
1203 atomic_read(&ns->ns_bref), rc);
1204 GOTO(force_wait, rc);
1207 if (atomic_read(&ns->ns_bref)) {
1208 LCONSOLE_ERROR("Cleanup waiting for %s namespace "
1209 "with %d resources in use, (rc=%d)\n",
1211 atomic_read(&ns->ns_bref), rc);
1212 RETURN(ELDLM_NAMESPACE_EXISTS);
1214 CDEBUG(D_DLMTRACE, "dlm namespace %s free done waiting\n",
1222 * Performs various cleanups for passed \a ns to make it drop refc and be
1223 * ready for freeing. Waits for refc == 0.
1225 * The following is done:
1226 * (0) Unregister \a ns from its list to make inaccessible for potential
1227 * users like pools thread and others;
1228 * (1) Clear all locks in \a ns.
1230 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
1231 struct obd_import *imp,
1241 spin_lock(&ns->ns_lock);
1242 ns->ns_stopping = 1;
1243 spin_unlock(&ns->ns_lock);
1246 * Can fail with -EINTR when force == 0 in which case try harder.
1248 rc = __ldlm_namespace_free(ns, force);
1249 if (rc != ELDLM_OK) {
1251 ptlrpc_disconnect_import(imp, 0);
1252 ptlrpc_invalidate_import(imp);
1256 * With all requests dropped and the import inactive
1257 * we are gaurenteed all reference will be dropped.
1259 rc = __ldlm_namespace_free(ns, 1);
1264 EXPORT_SYMBOL(ldlm_namespace_free_prior);
1267 * Performs freeing memory structures related to \a ns. This is only done
1268 * when ldlm_namespce_free_prior() successfully removed all resources
1269 * referencing \a ns and its refc == 0.
1271 void ldlm_namespace_free_post(struct ldlm_namespace *ns)
1279 /* Make sure that nobody can find this ns in its list. */
1280 ldlm_namespace_unregister(ns, ns->ns_client);
1281 /* Fini pool _before_ parent proc dir is removed. This is important as
1282 * ldlm_pool_fini() removes own proc dir which is child to @dir.
1283 * Removing it after @dir may cause oops. */
1284 ldlm_pool_fini(&ns->ns_pool);
1286 ldlm_namespace_debugfs_unregister(ns);
1287 ldlm_namespace_sysfs_unregister(ns);
1288 cfs_hash_putref(ns->ns_rs_hash);
1289 /* Namespace \a ns should be not on list at this time, otherwise
1290 * this will cause issues related to using freed \a ns in poold
1292 LASSERT(list_empty(&ns->ns_list_chain));
1297 EXPORT_SYMBOL(ldlm_namespace_free_post);
1300 * Cleanup the resource, and free namespace.
1303 * proc1: destroy import
1304 * class_disconnect_export(grab cl_sem) ->
1305 * -> ldlm_namespace_free ->
1306 * -> lprocfs_remove(grab _lprocfs_lock).
1307 * proc2: read proc info
1308 * lprocfs_fops_read(grab _lprocfs_lock) ->
1309 * -> osc_rd_active, etc(grab cl_sem).
1311 * So that I have to split the ldlm_namespace_free into two parts - the first
1312 * part ldlm_namespace_free_prior is used to cleanup the resource which is
1313 * being used; the 2nd part ldlm_namespace_free_post is used to unregister the
1314 * lprocfs entries, and then free memory. It will be called w/o cli->cl_sem
1317 void ldlm_namespace_free(struct ldlm_namespace *ns,
1318 struct obd_import *imp,
1321 ldlm_namespace_free_prior(ns, imp, force);
1322 ldlm_namespace_free_post(ns);
1324 EXPORT_SYMBOL(ldlm_namespace_free);
1326 void ldlm_namespace_get(struct ldlm_namespace *ns)
1328 atomic_inc(&ns->ns_bref);
1331 /* This is only for callers that care about refcount */
1332 static int ldlm_namespace_get_return(struct ldlm_namespace *ns)
1334 return atomic_inc_return(&ns->ns_bref);
1337 void ldlm_namespace_put(struct ldlm_namespace *ns)
1339 if (atomic_dec_and_lock(&ns->ns_bref, &ns->ns_lock)) {
1340 wake_up(&ns->ns_waitq);
1341 spin_unlock(&ns->ns_lock);
1345 /** Register \a ns in the list of namespaces */
1346 void ldlm_namespace_register(struct ldlm_namespace *ns, enum ldlm_side client)
1348 mutex_lock(ldlm_namespace_lock(client));
1349 LASSERT(list_empty(&ns->ns_list_chain));
1350 list_add(&ns->ns_list_chain, ldlm_namespace_inactive_list(client));
1351 ldlm_namespace_nr_inc(client);
1352 mutex_unlock(ldlm_namespace_lock(client));
1355 /** Unregister \a ns from the list of namespaces. */
1356 void ldlm_namespace_unregister(struct ldlm_namespace *ns, enum ldlm_side client)
1358 mutex_lock(ldlm_namespace_lock(client));
1359 LASSERT(!list_empty(&ns->ns_list_chain));
1360 /* Some asserts and possibly other parts of the code are still
1361 * using list_empty(&ns->ns_list_chain). This is why it is
1362 * important to use list_del_init() here. */
1363 list_del_init(&ns->ns_list_chain);
1364 ldlm_namespace_nr_dec(client);
1365 mutex_unlock(ldlm_namespace_lock(client));
1368 /** Should be called with ldlm_namespace_lock(client) taken. */
1369 void ldlm_namespace_move_to_active_locked(struct ldlm_namespace *ns,
1370 enum ldlm_side client)
1372 LASSERT(!list_empty(&ns->ns_list_chain));
1373 LASSERT(mutex_is_locked(ldlm_namespace_lock(client)));
1374 list_move_tail(&ns->ns_list_chain, ldlm_namespace_list(client));
1377 /** Should be called with ldlm_namespace_lock(client) taken. */
1378 void ldlm_namespace_move_to_inactive_locked(struct ldlm_namespace *ns,
1379 enum ldlm_side client)
1381 LASSERT(!list_empty(&ns->ns_list_chain));
1382 LASSERT(mutex_is_locked(ldlm_namespace_lock(client)));
1383 list_move_tail(&ns->ns_list_chain,
1384 ldlm_namespace_inactive_list(client));
1387 /** Should be called with ldlm_namespace_lock(client) taken. */
1388 struct ldlm_namespace *ldlm_namespace_first_locked(enum ldlm_side client)
1390 LASSERT(mutex_is_locked(ldlm_namespace_lock(client)));
1391 LASSERT(!list_empty(ldlm_namespace_list(client)));
1392 return container_of(ldlm_namespace_list(client)->next,
1393 struct ldlm_namespace, ns_list_chain);
1396 /** Create and initialize new resource. */
1397 static struct ldlm_resource *ldlm_resource_new(enum ldlm_type ldlm_type)
1399 struct ldlm_resource *res;
1402 OBD_SLAB_ALLOC_PTR_GFP(res, ldlm_resource_slab, GFP_NOFS);
1406 if (ldlm_type == LDLM_EXTENT) {
1407 OBD_SLAB_ALLOC(res->lr_itree, ldlm_interval_tree_slab,
1408 sizeof(*res->lr_itree) * LCK_MODE_NUM);
1409 if (res->lr_itree == NULL) {
1410 OBD_SLAB_FREE_PTR(res, ldlm_resource_slab);
1413 /* Initialize interval trees for each lock mode. */
1414 for (idx = 0; idx < LCK_MODE_NUM; idx++) {
1415 res->lr_itree[idx].lit_size = 0;
1416 res->lr_itree[idx].lit_mode = 1 << idx;
1417 res->lr_itree[idx].lit_root = NULL;
1421 INIT_LIST_HEAD(&res->lr_granted);
1422 INIT_LIST_HEAD(&res->lr_waiting);
1424 atomic_set(&res->lr_refcount, 1);
1425 spin_lock_init(&res->lr_lock);
1426 lu_ref_init(&res->lr_reference);
1428 /* Since LVB init can be delayed now, there is no longer need to
1429 * immediatelly acquire mutex here. */
1430 mutex_init(&res->lr_lvb_mutex);
1431 res->lr_lvb_initialized = false;
1437 * Return a reference to resource with given name, creating it if necessary.
1438 * Args: namespace with ns_lock unlocked
1439 * Locks: takes and releases NS hash-lock and res->lr_lock
1440 * Returns: referenced, unlocked ldlm_resource or NULL
1442 struct ldlm_resource *
1443 ldlm_resource_get(struct ldlm_namespace *ns, struct ldlm_resource *parent,
1444 const struct ldlm_res_id *name, enum ldlm_type type,
1447 struct hlist_node *hnode;
1448 struct ldlm_resource *res = NULL;
1449 struct cfs_hash_bd bd;
1451 int ns_refcount = 0;
1453 LASSERT(ns != NULL);
1454 LASSERT(parent == NULL);
1455 LASSERT(ns->ns_rs_hash != NULL);
1456 LASSERT(name->name[0] != 0);
1458 cfs_hash_bd_get_and_lock(ns->ns_rs_hash, (void *)name, &bd, 0);
1459 hnode = cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1460 if (hnode != NULL) {
1461 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1465 version = cfs_hash_bd_version_get(&bd);
1466 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1469 return ERR_PTR(-ENOENT);
1471 LASSERTF(type >= LDLM_MIN_TYPE && type < LDLM_MAX_TYPE,
1472 "type: %d\n", type);
1473 res = ldlm_resource_new(type);
1475 return ERR_PTR(-ENOMEM);
1477 res->lr_ns_bucket = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
1478 res->lr_name = *name;
1479 res->lr_type = type;
1481 cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
1482 hnode = (version == cfs_hash_bd_version_get(&bd)) ? NULL :
1483 cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1485 if (hnode != NULL) {
1486 /* Someone won the race and already added the resource. */
1487 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1488 /* Clean lu_ref for failed resource. */
1489 lu_ref_fini(&res->lr_reference);
1490 if (res->lr_itree != NULL)
1491 OBD_SLAB_FREE(res->lr_itree, ldlm_interval_tree_slab,
1492 sizeof(*res->lr_itree) * LCK_MODE_NUM);
1493 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1495 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
1498 /* We won! Let's add the resource. */
1499 cfs_hash_bd_add_locked(ns->ns_rs_hash, &bd, &res->lr_hash);
1500 if (cfs_hash_bd_count_get(&bd) == 1)
1501 ns_refcount = ldlm_namespace_get_return(ns);
1503 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1505 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CREATE_RESOURCE, 2);
1507 /* Let's see if we happened to be the very first resource in this
1508 * namespace. If so, and this is a client namespace, we need to move
1509 * the namespace into the active namespaces list to be patrolled by
1510 * the ldlm_poold. */
1511 if (ns_is_client(ns) && ns_refcount == 1) {
1512 mutex_lock(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
1513 ldlm_namespace_move_to_active_locked(ns, LDLM_NAMESPACE_CLIENT);
1514 mutex_unlock(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
1519 EXPORT_SYMBOL(ldlm_resource_get);
1521 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res)
1523 LASSERT(res != NULL);
1524 LASSERT(res != LP_POISON);
1525 atomic_inc(&res->lr_refcount);
1526 CDEBUG(D_INFO, "getref res: %p count: %d\n", res,
1527 atomic_read(&res->lr_refcount));
1531 static void __ldlm_resource_putref_final(struct cfs_hash_bd *bd,
1532 struct ldlm_resource *res)
1534 struct ldlm_ns_bucket *nsb = res->lr_ns_bucket;
1536 if (!list_empty(&res->lr_granted)) {
1537 ldlm_resource_dump(D_ERROR, res);
1541 if (!list_empty(&res->lr_waiting)) {
1542 ldlm_resource_dump(D_ERROR, res);
1546 cfs_hash_bd_del_locked(nsb->nsb_namespace->ns_rs_hash,
1548 lu_ref_fini(&res->lr_reference);
1549 if (cfs_hash_bd_count_get(bd) == 0)
1550 ldlm_namespace_put(nsb->nsb_namespace);
1553 /* Returns 1 if the resource was freed, 0 if it remains. */
1554 int ldlm_resource_putref(struct ldlm_resource *res)
1556 struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1557 struct cfs_hash_bd bd;
1559 LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
1560 CDEBUG(D_INFO, "putref res: %p count: %d\n",
1561 res, atomic_read(&res->lr_refcount) - 1);
1563 cfs_hash_bd_get(ns->ns_rs_hash, &res->lr_name, &bd);
1564 if (cfs_hash_bd_dec_and_lock(ns->ns_rs_hash, &bd, &res->lr_refcount)) {
1565 __ldlm_resource_putref_final(&bd, res);
1566 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1567 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
1568 ns->ns_lvbo->lvbo_free(res);
1569 if (res->lr_itree != NULL)
1570 OBD_SLAB_FREE(res->lr_itree, ldlm_interval_tree_slab,
1571 sizeof(*res->lr_itree) * LCK_MODE_NUM);
1572 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1577 EXPORT_SYMBOL(ldlm_resource_putref);
1580 * Add a lock into a given resource into specified lock list.
1582 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
1583 struct ldlm_lock *lock)
1585 check_res_locked(res);
1587 LDLM_DEBUG(lock, "About to add this lock");
1589 if (ldlm_is_destroyed(lock)) {
1590 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1594 LASSERT(list_empty(&lock->l_res_link));
1596 list_add_tail(&lock->l_res_link, head);
1600 * Insert a lock into resource after specified lock.
1602 * Obtain resource description from the lock we are inserting after.
1604 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
1605 struct ldlm_lock *new)
1607 struct ldlm_resource *res = original->l_resource;
1609 check_res_locked(res);
1611 ldlm_resource_dump(D_INFO, res);
1612 LDLM_DEBUG(new, "About to insert this lock after %p: ", original);
1614 if (ldlm_is_destroyed(new)) {
1615 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1619 LASSERT(list_empty(&new->l_res_link));
1621 list_add(&new->l_res_link, &original->l_res_link);
1625 void ldlm_resource_unlink_lock(struct ldlm_lock *lock)
1627 int type = lock->l_resource->lr_type;
1629 check_res_locked(lock->l_resource);
1630 if (type == LDLM_IBITS || type == LDLM_PLAIN)
1631 ldlm_unlink_lock_skiplist(lock);
1632 else if (type == LDLM_EXTENT)
1633 ldlm_extent_unlink_lock(lock);
1634 list_del_init(&lock->l_res_link);
1636 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
1638 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc)
1640 desc->lr_type = res->lr_type;
1641 desc->lr_name = res->lr_name;
1645 * Print information about all locks in all namespaces on this node to debug
1648 void ldlm_dump_all_namespaces(enum ldlm_side client, int level)
1650 struct list_head *tmp;
1652 if (!((libcfs_debug | D_ERROR) & level))
1655 mutex_lock(ldlm_namespace_lock(client));
1657 list_for_each(tmp, ldlm_namespace_list(client)) {
1658 struct ldlm_namespace *ns;
1660 ns = list_entry(tmp, struct ldlm_namespace, ns_list_chain);
1661 ldlm_namespace_dump(level, ns);
1664 mutex_unlock(ldlm_namespace_lock(client));
1667 static int ldlm_res_hash_dump(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1668 struct hlist_node *hnode, void *arg)
1670 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1671 int level = (int)(unsigned long)arg;
1674 ldlm_resource_dump(level, res);
1681 * Print information about all locks in this namespace on this node to debug
1684 void ldlm_namespace_dump(int level, struct ldlm_namespace *ns)
1686 if (!((libcfs_debug | D_ERROR) & level))
1689 CDEBUG(level, "--- Namespace: %s (rc: %d, side: %s)\n",
1690 ldlm_ns_name(ns), atomic_read(&ns->ns_bref),
1691 ns_is_client(ns) ? "client" : "server");
1693 if (ktime_get_seconds() < ns->ns_next_dump)
1696 cfs_hash_for_each_nolock(ns->ns_rs_hash,
1698 (void *)(unsigned long)level, 0);
1699 spin_lock(&ns->ns_lock);
1700 ns->ns_next_dump = ktime_get_seconds() + 10;
1701 spin_unlock(&ns->ns_lock);
1705 * Print information about all locks in this resource to debug log.
1707 void ldlm_resource_dump(int level, struct ldlm_resource *res)
1709 struct ldlm_lock *lock;
1710 unsigned int granted = 0;
1712 CLASSERT(RES_NAME_SIZE == 4);
1714 if (!((libcfs_debug | D_ERROR) & level))
1717 CDEBUG(level, "--- Resource: "DLDLMRES" (%p) refcount = %d\n",
1718 PLDLMRES(res), res, atomic_read(&res->lr_refcount));
1720 if (!list_empty(&res->lr_granted)) {
1721 CDEBUG(level, "Granted locks (in reverse order):\n");
1722 list_for_each_entry_reverse(lock, &res->lr_granted,
1724 LDLM_DEBUG_LIMIT(level, lock, "###");
1725 if (!(level & D_CANTMASK) &&
1726 ++granted > ldlm_dump_granted_max) {
1727 CDEBUG(level, "only dump %d granted locks to "
1728 "avoid DDOS.\n", granted);
1734 if (!list_empty(&res->lr_waiting)) {
1735 CDEBUG(level, "Waiting locks:\n");
1736 list_for_each_entry(lock, &res->lr_waiting, l_res_link)
1737 LDLM_DEBUG_LIMIT(level, lock, "###");
1740 EXPORT_SYMBOL(ldlm_resource_dump);