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;
118 char kernbuf[22] = "";
121 if (count >= sizeof(kernbuf))
124 if (copy_from_user(kernbuf, buffer, count))
128 rc = sysfs_memparse(kernbuf, count, &value, "MiB");
130 CERROR("Failed to set %s, rc = %d.\n",
131 wm_low ? "lock_reclaim_threshold_mb" : "lock_limit_mb",
134 } else if (value != 0 && value < (1 << 20)) {
135 CERROR("%s should be greater than 1MB.\n",
136 wm_low ? "lock_reclaim_threshold_mb" : "lock_limit_mb");
139 watermark = value >> 20;
142 if (ldlm_lock_limit_mb != 0 && watermark > ldlm_lock_limit_mb) {
143 CERROR("lock_reclaim_threshold_mb must be smaller than "
149 if (watermark != 0) {
151 do_div(watermark, sizeof(struct ldlm_lock));
153 ldlm_reclaim_threshold = watermark;
155 if (ldlm_reclaim_threshold_mb != 0 &&
156 watermark < ldlm_reclaim_threshold_mb) {
157 CERROR("lock_limit_mb must be greater than "
158 "lock_reclaim_threshold_mb.\n");
163 if (watermark != 0) {
165 do_div(watermark, sizeof(struct ldlm_lock));
167 ldlm_lock_limit = watermark;
173 static int seq_watermark_open(struct inode *inode, struct file *file)
175 return single_open(file, seq_watermark_show, inode->i_private);
178 static const struct file_operations ldlm_watermark_fops = {
179 .owner = THIS_MODULE,
180 .open = seq_watermark_open,
182 .write = seq_watermark_write,
184 .release = lprocfs_single_release,
187 static int seq_granted_show(struct seq_file *m, void *data)
189 seq_printf(m, "%llu\n", percpu_counter_sum_positive(
190 (struct percpu_counter *)m->private));
194 static int seq_granted_open(struct inode *inode, struct file *file)
196 return single_open(file, seq_granted_show, inode->i_private);
199 static const struct file_operations ldlm_granted_fops = {
200 .owner = THIS_MODULE,
201 .open = seq_granted_open,
204 .release = seq_release,
207 #endif /* HAVE_SERVER_SUPPORT */
209 static struct lprocfs_vars ldlm_debugfs_list[] = {
210 { .name = "dump_namespaces",
211 .fops = &ldlm_dump_ns_fops,
213 { .name = "dump_granted_max",
214 .fops = &ldlm_rw_uint_fops,
215 .data = &ldlm_dump_granted_max },
216 #ifdef HAVE_SERVER_SUPPORT
217 { .name = "lock_reclaim_threshold_mb",
218 .fops = &ldlm_watermark_fops,
219 .data = &ldlm_reclaim_threshold_mb },
220 { .name = "lock_limit_mb",
221 .fops = &ldlm_watermark_fops,
222 .data = &ldlm_lock_limit_mb },
223 { .name = "lock_granted_count",
224 .fops = &ldlm_granted_fops,
225 .data = &ldlm_granted_total },
230 int ldlm_debugfs_setup(void)
235 ldlm_debugfs_dir = ldebugfs_register(OBD_LDLM_DEVICENAME,
238 if (IS_ERR_OR_NULL(ldlm_debugfs_dir)) {
239 CERROR("LDebugFS failed in ldlm-init\n");
240 rc = ldlm_debugfs_dir ? PTR_ERR(ldlm_debugfs_dir) : -ENOMEM;
241 ldlm_debugfs_dir = NULL;
245 ldlm_ns_debugfs_dir = ldebugfs_register("namespaces",
248 if (IS_ERR_OR_NULL(ldlm_ns_debugfs_dir)) {
249 CERROR("LProcFS failed in ldlm-init\n");
250 rc = ldlm_ns_debugfs_dir ? PTR_ERR(ldlm_ns_debugfs_dir)
255 ldlm_svc_debugfs_dir = ldebugfs_register("services",
258 if (IS_ERR_OR_NULL(ldlm_svc_debugfs_dir)) {
259 CERROR("LProcFS failed in ldlm-init\n");
260 rc = ldlm_svc_debugfs_dir ? PTR_ERR(ldlm_svc_debugfs_dir)
265 rc = ldebugfs_add_vars(ldlm_debugfs_dir, ldlm_debugfs_list, NULL);
267 CERROR("LProcFS failed in ldlm-init\n");
274 debugfs_remove_recursive(ldlm_debugfs_dir);
275 ldlm_svc_debugfs_dir = NULL;
276 ldlm_ns_debugfs_dir = NULL;
277 ldlm_debugfs_dir = NULL;
281 void ldlm_debugfs_cleanup(void)
283 debugfs_remove_recursive(ldlm_debugfs_dir);
285 ldlm_svc_debugfs_dir = NULL;
286 ldlm_ns_debugfs_dir = NULL;
287 ldlm_debugfs_dir = NULL;
290 static ssize_t resource_count_show(struct kobject *kobj, struct attribute *attr,
293 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
298 /* result is not strictly consistant */
299 for (i = 0; i < (1 << ns->ns_bucket_bits); i++)
300 res += atomic_read(&ns->ns_rs_buckets[i].nsb_count);
301 return sprintf(buf, "%lld\n", res);
303 LUSTRE_RO_ATTR(resource_count);
305 static ssize_t lock_count_show(struct kobject *kobj, struct attribute *attr,
308 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
312 locks = lprocfs_stats_collector(ns->ns_stats, LDLM_NSS_LOCKS,
313 LPROCFS_FIELDS_FLAGS_SUM);
314 return sprintf(buf, "%lld\n", locks);
316 LUSTRE_RO_ATTR(lock_count);
318 static ssize_t lock_unused_count_show(struct kobject *kobj,
319 struct attribute *attr,
322 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
325 return sprintf(buf, "%d\n", ns->ns_nr_unused);
327 LUSTRE_RO_ATTR(lock_unused_count);
329 static ssize_t lru_size_show(struct kobject *kobj, struct attribute *attr,
332 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
334 __u32 *nr = &ns->ns_max_unused;
336 if (ns_connect_lru_resize(ns))
337 nr = &ns->ns_nr_unused;
338 return sprintf(buf, "%u\n", *nr);
341 static ssize_t lru_size_store(struct kobject *kobj, struct attribute *attr,
342 const char *buffer, size_t count)
344 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
350 if (strncmp(buffer, "clear", 5) == 0) {
352 "dropping all unused locks from namespace %s\n",
354 if (ns_connect_lru_resize(ns)) {
355 /* Try to cancel all @ns_nr_unused locks. */
356 ldlm_cancel_lru(ns, ns->ns_nr_unused, 0,
357 LDLM_LRU_FLAG_PASSED |
358 LDLM_LRU_FLAG_CLEANUP);
360 tmp = ns->ns_max_unused;
361 ns->ns_max_unused = 0;
362 ldlm_cancel_lru(ns, 0, 0, LDLM_LRU_FLAG_PASSED |
363 LDLM_LRU_FLAG_CLEANUP);
364 ns->ns_max_unused = tmp;
369 err = kstrtoul(buffer, 10, &tmp);
371 CERROR("lru_size: invalid value written\n");
374 lru_resize = (tmp == 0);
376 if (ns_connect_lru_resize(ns)) {
378 ns->ns_max_unused = (unsigned int)tmp;
380 if (tmp > ns->ns_nr_unused)
381 tmp = ns->ns_nr_unused;
382 tmp = ns->ns_nr_unused - tmp;
385 "changing namespace %s unused locks from %u to %u\n",
386 ldlm_ns_name(ns), ns->ns_nr_unused,
388 ldlm_cancel_lru(ns, tmp, LCF_ASYNC, LDLM_LRU_FLAG_PASSED);
392 "disable lru_resize for namespace %s\n",
394 ns->ns_connect_flags &= ~OBD_CONNECT_LRU_RESIZE;
398 "changing namespace %s max_unused from %u to %u\n",
399 ldlm_ns_name(ns), ns->ns_max_unused,
401 ns->ns_max_unused = (unsigned int)tmp;
402 ldlm_cancel_lru(ns, 0, LCF_ASYNC, LDLM_LRU_FLAG_PASSED);
404 /* Make sure that LRU resize was originally supported before
405 * turning it on here.
408 (ns->ns_orig_connect_flags & OBD_CONNECT_LRU_RESIZE)) {
410 "enable lru_resize for namespace %s\n",
412 ns->ns_connect_flags |= OBD_CONNECT_LRU_RESIZE;
418 LUSTRE_RW_ATTR(lru_size);
420 static ssize_t lru_max_age_show(struct kobject *kobj, struct attribute *attr,
423 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
426 return sprintf(buf, "%lld\n", ktime_to_ms(ns->ns_max_age));
429 static ssize_t lru_max_age_store(struct kobject *kobj, struct attribute *attr,
430 const char *buffer, size_t count)
432 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
434 int scale = NSEC_PER_MSEC;
435 unsigned long long tmp;
438 /* Did the user ask in seconds or milliseconds. Default is in ms */
439 buf = strstr(buffer, "ms");
441 buf = strchr(buffer, 's');
443 scale = NSEC_PER_SEC;
449 if (kstrtoull(buffer, 10, &tmp))
452 ns->ns_max_age = ktime_set(0, tmp * scale);
456 LUSTRE_RW_ATTR(lru_max_age);
458 static ssize_t early_lock_cancel_show(struct kobject *kobj,
459 struct attribute *attr,
462 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
465 return sprintf(buf, "%d\n", ns_connect_cancelset(ns));
468 static ssize_t early_lock_cancel_store(struct kobject *kobj,
469 struct attribute *attr,
473 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
475 unsigned long supp = -1;
478 rc = kstrtoul(buffer, 10, &supp);
483 ns->ns_connect_flags &= ~OBD_CONNECT_CANCELSET;
484 else if (ns->ns_orig_connect_flags & OBD_CONNECT_CANCELSET)
485 ns->ns_connect_flags |= OBD_CONNECT_CANCELSET;
488 LUSTRE_RW_ATTR(early_lock_cancel);
490 static ssize_t dirty_age_limit_show(struct kobject *kobj,
491 struct attribute *attr, char *buf)
493 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
496 return sprintf(buf, "%llu\n", ns->ns_dirty_age_limit);
499 static ssize_t dirty_age_limit_store(struct kobject *kobj,
500 struct attribute *attr,
501 const char *buffer, size_t count)
503 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
505 unsigned long long tmp;
507 if (kstrtoull(buffer, 10, &tmp))
510 ns->ns_dirty_age_limit = tmp;
514 LUSTRE_RW_ATTR(dirty_age_limit);
516 #ifdef HAVE_SERVER_SUPPORT
517 static ssize_t ctime_age_limit_show(struct kobject *kobj,
518 struct attribute *attr, char *buf)
520 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
523 return sprintf(buf, "%llu\n", ns->ns_ctime_age_limit);
526 static ssize_t ctime_age_limit_store(struct kobject *kobj,
527 struct attribute *attr,
528 const char *buffer, size_t count)
530 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
532 unsigned long long tmp;
534 if (kstrtoull(buffer, 10, &tmp))
537 ns->ns_ctime_age_limit = tmp;
541 LUSTRE_RW_ATTR(ctime_age_limit);
543 static ssize_t lock_timeouts_show(struct kobject *kobj, struct attribute *attr,
546 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
549 return sprintf(buf, "%d\n", ns->ns_timeouts);
551 LUSTRE_RO_ATTR(lock_timeouts);
553 static ssize_t max_nolock_bytes_show(struct kobject *kobj,
554 struct attribute *attr, char *buf)
556 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
559 return sprintf(buf, "%u\n", ns->ns_max_nolock_size);
562 static ssize_t max_nolock_bytes_store(struct kobject *kobj,
563 struct attribute *attr,
564 const char *buffer, size_t count)
566 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
571 err = kstrtoul(buffer, 10, &tmp);
575 ns->ns_max_nolock_size = tmp;
579 LUSTRE_RW_ATTR(max_nolock_bytes);
581 static ssize_t contention_seconds_show(struct kobject *kobj,
582 struct attribute *attr, char *buf)
584 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
587 return sprintf(buf, "%llu\n", ns->ns_contention_time);
590 static ssize_t contention_seconds_store(struct kobject *kobj,
591 struct attribute *attr,
592 const char *buffer, size_t count)
594 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
596 unsigned long long tmp;
598 if (kstrtoull(buffer, 10, &tmp))
601 ns->ns_contention_time = tmp;
605 LUSTRE_RW_ATTR(contention_seconds);
607 static ssize_t contended_locks_show(struct kobject *kobj,
608 struct attribute *attr, char *buf)
610 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
613 return sprintf(buf, "%u\n", ns->ns_contended_locks);
616 static ssize_t contended_locks_store(struct kobject *kobj,
617 struct attribute *attr,
618 const char *buffer, size_t count)
620 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
625 err = kstrtoul(buffer, 10, &tmp);
629 ns->ns_contended_locks = tmp;
633 LUSTRE_RW_ATTR(contended_locks);
635 static ssize_t max_parallel_ast_show(struct kobject *kobj,
636 struct attribute *attr, char *buf)
638 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
641 return sprintf(buf, "%u\n", ns->ns_max_parallel_ast);
644 static ssize_t max_parallel_ast_store(struct kobject *kobj,
645 struct attribute *attr,
646 const char *buffer, size_t count)
648 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
653 err = kstrtoul(buffer, 10, &tmp);
657 ns->ns_max_parallel_ast = tmp;
661 LUSTRE_RW_ATTR(max_parallel_ast);
663 #endif /* HAVE_SERVER_SUPPORT */
665 /* These are for namespaces in /sys/fs/lustre/ldlm/namespaces/ */
666 static struct attribute *ldlm_ns_attrs[] = {
667 &lustre_attr_resource_count.attr,
668 &lustre_attr_lock_count.attr,
669 &lustre_attr_lock_unused_count.attr,
670 &lustre_attr_lru_size.attr,
671 &lustre_attr_lru_max_age.attr,
672 &lustre_attr_early_lock_cancel.attr,
673 &lustre_attr_dirty_age_limit.attr,
674 #ifdef HAVE_SERVER_SUPPORT
675 &lustre_attr_ctime_age_limit.attr,
676 &lustre_attr_lock_timeouts.attr,
677 &lustre_attr_max_nolock_bytes.attr,
678 &lustre_attr_contention_seconds.attr,
679 &lustre_attr_contended_locks.attr,
680 &lustre_attr_max_parallel_ast.attr,
685 static void ldlm_ns_release(struct kobject *kobj)
687 struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
689 complete(&ns->ns_kobj_unregister);
692 static struct kobj_type ldlm_ns_ktype = {
693 .default_attrs = ldlm_ns_attrs,
694 .sysfs_ops = &lustre_sysfs_ops,
695 .release = ldlm_ns_release,
698 static void ldlm_namespace_debugfs_unregister(struct ldlm_namespace *ns)
700 if (IS_ERR_OR_NULL(ns->ns_debugfs_entry))
701 CERROR("dlm namespace %s has no procfs dir?\n",
704 debugfs_remove_recursive(ns->ns_debugfs_entry);
706 if (ns->ns_stats != NULL)
707 lprocfs_free_stats(&ns->ns_stats);
710 void ldlm_namespace_sysfs_unregister(struct ldlm_namespace *ns)
712 kobject_put(&ns->ns_kobj);
713 wait_for_completion(&ns->ns_kobj_unregister);
716 int ldlm_namespace_sysfs_register(struct ldlm_namespace *ns)
720 ns->ns_kobj.kset = ldlm_ns_kset;
721 init_completion(&ns->ns_kobj_unregister);
722 err = kobject_init_and_add(&ns->ns_kobj, &ldlm_ns_ktype, NULL,
723 "%s", ldlm_ns_name(ns));
725 ns->ns_stats = lprocfs_alloc_stats(LDLM_NSS_LAST, 0);
727 kobject_put(&ns->ns_kobj);
731 lprocfs_counter_init(ns->ns_stats, LDLM_NSS_LOCKS,
732 LPROCFS_CNTR_AVGMINMAX, "locks", "locks");
737 static int ldlm_namespace_debugfs_register(struct ldlm_namespace *ns)
739 struct dentry *ns_entry;
741 if (!IS_ERR_OR_NULL(ns->ns_debugfs_entry)) {
742 ns_entry = ns->ns_debugfs_entry;
744 ns_entry = debugfs_create_dir(ldlm_ns_name(ns),
745 ldlm_ns_debugfs_dir);
748 ns->ns_debugfs_entry = ns_entry;
753 #undef MAX_STRING_SIZE
755 static unsigned ldlm_res_hop_hash(struct cfs_hash *hs,
756 const void *key, unsigned int mask)
758 const struct ldlm_res_id *id = key;
759 unsigned int val = 0;
762 for (i = 0; i < RES_NAME_SIZE; i++)
767 static unsigned int ldlm_res_hop_fid_hash(const struct ldlm_res_id *id, unsigned int bits)
773 fid.f_seq = id->name[LUSTRE_RES_ID_SEQ_OFF];
774 fid.f_oid = (__u32)id->name[LUSTRE_RES_ID_VER_OID_OFF];
775 fid.f_ver = (__u32)(id->name[LUSTRE_RES_ID_VER_OID_OFF] >> 32);
777 hash = fid_flatten32(&fid);
778 hash += (hash >> 4) + (hash << 12); /* mixing oid and seq */
779 if (id->name[LUSTRE_RES_ID_HSH_OFF] != 0) {
780 val = id->name[LUSTRE_RES_ID_HSH_OFF];
784 hash += (val >> 5) + (val << 11);
785 return cfs_hash_32(hash, bits);
788 static void *ldlm_res_hop_key(struct hlist_node *hnode)
790 struct ldlm_resource *res;
792 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
793 return &res->lr_name;
796 static int ldlm_res_hop_keycmp(const void *key, struct hlist_node *hnode)
798 struct ldlm_resource *res;
800 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
801 return ldlm_res_eq((const struct ldlm_res_id *)key,
802 (const struct ldlm_res_id *)&res->lr_name);
805 static void *ldlm_res_hop_object(struct hlist_node *hnode)
807 return hlist_entry(hnode, struct ldlm_resource, lr_hash);
811 ldlm_res_hop_get_locked(struct cfs_hash *hs, struct hlist_node *hnode)
813 struct ldlm_resource *res;
815 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
816 ldlm_resource_getref(res);
819 static void ldlm_res_hop_put(struct cfs_hash *hs, struct hlist_node *hnode)
821 struct ldlm_resource *res;
823 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
824 ldlm_resource_putref(res);
827 static struct cfs_hash_ops ldlm_ns_hash_ops = {
828 .hs_hash = ldlm_res_hop_hash,
829 .hs_key = ldlm_res_hop_key,
830 .hs_keycmp = ldlm_res_hop_keycmp,
832 .hs_object = ldlm_res_hop_object,
833 .hs_get = ldlm_res_hop_get_locked,
834 .hs_put = ldlm_res_hop_put
838 /** hash bucket bits */
839 unsigned nsd_bkt_bits;
841 unsigned nsd_all_bits;
842 } ldlm_ns_hash_defs[] = {
843 [LDLM_NS_TYPE_MDC] = {
847 [LDLM_NS_TYPE_MDT] = {
851 [LDLM_NS_TYPE_OSC] = {
855 [LDLM_NS_TYPE_OST] = {
859 [LDLM_NS_TYPE_MGC] = {
863 [LDLM_NS_TYPE_MGT] = {
870 * Create and initialize new empty namespace.
872 struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
873 enum ldlm_side client,
874 enum ldlm_appetite apt,
875 enum ldlm_ns_type ns_type)
877 struct ldlm_namespace *ns = NULL;
882 LASSERT(obd != NULL);
886 CERROR("ldlm_get_ref failed: %d\n", rc);
890 if (ns_type >= ARRAY_SIZE(ldlm_ns_hash_defs) ||
891 ldlm_ns_hash_defs[ns_type].nsd_bkt_bits == 0) {
892 CERROR("Unknown type %d for ns %s\n", ns_type, name);
900 ns->ns_rs_hash = cfs_hash_create(name,
901 ldlm_ns_hash_defs[ns_type].nsd_all_bits,
902 ldlm_ns_hash_defs[ns_type].nsd_all_bits,
903 ldlm_ns_hash_defs[ns_type].nsd_bkt_bits,
910 CFS_HASH_SPIN_BKTLOCK |
911 CFS_HASH_NO_ITEMREF);
912 if (ns->ns_rs_hash == NULL)
915 ns->ns_bucket_bits = ldlm_ns_hash_defs[ns_type].nsd_all_bits -
916 ldlm_ns_hash_defs[ns_type].nsd_bkt_bits;
918 OBD_ALLOC_LARGE(ns->ns_rs_buckets,
919 BIT(ns->ns_bucket_bits) * sizeof(ns->ns_rs_buckets[0]));
920 if (!ns->ns_rs_buckets)
923 for (idx = 0; idx < (1 << ns->ns_bucket_bits); idx++) {
924 struct ldlm_ns_bucket *nsb = &ns->ns_rs_buckets[idx];
926 at_init(&nsb->nsb_at_estimate, ldlm_enqueue_min, 0);
927 nsb->nsb_namespace = ns;
928 nsb->nsb_reclaim_start = 0;
929 atomic_set(&nsb->nsb_count, 0);
933 ns->ns_appetite = apt;
934 ns->ns_client = client;
935 ns->ns_name = kstrdup(name, GFP_KERNEL);
939 INIT_LIST_HEAD(&ns->ns_list_chain);
940 INIT_LIST_HEAD(&ns->ns_unused_list);
941 spin_lock_init(&ns->ns_lock);
942 atomic_set(&ns->ns_bref, 0);
943 init_waitqueue_head(&ns->ns_waitq);
945 ns->ns_max_nolock_size = NS_DEFAULT_MAX_NOLOCK_BYTES;
946 ns->ns_contention_time = NS_DEFAULT_CONTENTION_SECONDS;
947 ns->ns_contended_locks = NS_DEFAULT_CONTENDED_LOCKS;
949 ns->ns_max_parallel_ast = LDLM_DEFAULT_PARALLEL_AST_LIMIT;
950 ns->ns_nr_unused = 0;
951 ns->ns_max_unused = LDLM_DEFAULT_LRU_SIZE;
952 ns->ns_max_age = ktime_set(LDLM_DEFAULT_MAX_ALIVE, 0);
953 ns->ns_ctime_age_limit = LDLM_CTIME_AGE_LIMIT;
954 ns->ns_dirty_age_limit = LDLM_DIRTY_AGE_LIMIT;
956 ns->ns_orig_connect_flags = 0;
957 ns->ns_connect_flags = 0;
959 ns->ns_reclaim_start = 0;
960 ns->ns_last_pos = &ns->ns_unused_list;
962 rc = ldlm_namespace_sysfs_register(ns);
964 CERROR("Can't initialize ns sysfs, rc %d\n", rc);
968 rc = ldlm_namespace_debugfs_register(ns);
970 CERROR("Can't initialize ns proc, rc %d\n", rc);
974 idx = ldlm_namespace_nr_read(client);
975 rc = ldlm_pool_init(&ns->ns_pool, ns, idx, client);
977 CERROR("Can't initialize lock pool, rc %d\n", rc);
981 ldlm_namespace_register(ns, client);
984 ldlm_namespace_debugfs_unregister(ns);
986 ldlm_namespace_sysfs_unregister(ns);
987 ldlm_namespace_cleanup(ns, 0);
989 OBD_FREE_LARGE(ns->ns_rs_buckets,
990 BIT(ns->ns_bucket_bits) * sizeof(ns->ns_rs_buckets[0]));
992 cfs_hash_putref(ns->ns_rs_hash);
999 EXPORT_SYMBOL(ldlm_namespace_new);
1002 * Cancel and destroy all locks on a resource.
1004 * If flags contains FL_LOCAL_ONLY, don't try to tell the server, just
1005 * clean up. This is currently only used for recovery, and we make
1006 * certain assumptions as a result--notably, that we shouldn't cancel
1009 static void cleanup_resource(struct ldlm_resource *res, struct list_head *q,
1012 struct list_head *tmp;
1013 int rc = 0, client = ns_is_client(ldlm_res_to_ns(res));
1014 bool local_only = !!(flags & LDLM_FL_LOCAL_ONLY);
1017 struct ldlm_lock *lock = NULL;
1019 /* First, we look for non-cleaned-yet lock
1020 * all cleaned locks are marked by CLEANED flag. */
1022 list_for_each(tmp, q) {
1023 lock = list_entry(tmp, struct ldlm_lock,
1025 if (ldlm_is_cleaned(lock)) {
1029 LDLM_LOCK_GET(lock);
1030 ldlm_set_cleaned(lock);
1039 /* Set CBPENDING so nothing in the cancellation path
1040 * can match this lock. */
1041 ldlm_set_cbpending(lock);
1042 ldlm_set_failed(lock);
1043 lock->l_flags |= flags;
1045 /* ... without sending a CANCEL message for local_only. */
1047 ldlm_set_local_only(lock);
1049 if (local_only && (lock->l_readers || lock->l_writers)) {
1051 * This is a little bit gross, but much better than the
1052 * alternative: pretend that we got a blocking AST from
1053 * the server, so that when the lock is decref'd, it
1057 LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
1058 if (lock->l_flags & LDLM_FL_FAIL_LOC) {
1059 set_current_state(TASK_UNINTERRUPTIBLE);
1060 schedule_timeout(cfs_time_seconds(4));
1061 set_current_state(TASK_RUNNING);
1063 if (lock->l_completion_ast)
1064 lock->l_completion_ast(lock,
1065 LDLM_FL_FAILED, NULL);
1066 LDLM_LOCK_RELEASE(lock);
1071 struct lustre_handle lockh;
1074 ldlm_lock2handle(lock, &lockh);
1075 rc = ldlm_cli_cancel(&lockh, LCF_LOCAL);
1077 CERROR("ldlm_cli_cancel: %d\n", rc);
1081 "Freeing a lock still held by a client node");
1082 ldlm_lock_cancel(lock);
1084 LDLM_LOCK_RELEASE(lock);
1088 static int ldlm_resource_clean(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1089 struct hlist_node *hnode, void *arg)
1091 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1092 __u64 flags = *(__u64 *)arg;
1094 cleanup_resource(res, &res->lr_granted, flags);
1095 cleanup_resource(res, &res->lr_waiting, flags);
1100 static int ldlm_resource_complain(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1101 struct hlist_node *hnode, void *arg)
1103 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1106 CERROR("%s: namespace resource "DLDLMRES" (%p) refcount nonzero "
1107 "(%d) after lock cleanup; forcing cleanup.\n",
1108 ldlm_ns_name(ldlm_res_to_ns(res)), PLDLMRES(res), res,
1109 atomic_read(&res->lr_refcount) - 1);
1111 /* Use D_NETERROR since it is in the default mask */
1112 ldlm_resource_dump(D_NETERROR, res);
1118 * Cancel and destroy all locks in the namespace.
1120 * Typically used during evictions when server notified client that it was
1121 * evicted and all of its state needs to be destroyed.
1122 * Also used during shutdown.
1124 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, __u64 flags)
1127 CDEBUG(D_INFO, "NULL ns, skipping cleanup\n");
1131 cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_clean,
1133 cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_complain,
1137 EXPORT_SYMBOL(ldlm_namespace_cleanup);
1140 * Attempts to free namespace.
1142 * Only used when namespace goes away, like during an unmount.
1144 static int __ldlm_namespace_free(struct ldlm_namespace *ns, int force)
1148 /* At shutdown time, don't call the cancellation callback */
1149 ldlm_namespace_cleanup(ns, force ? LDLM_FL_LOCAL_ONLY : 0);
1151 if (atomic_read(&ns->ns_bref) > 0) {
1154 "dlm namespace %s free waiting on refcount %d\n",
1155 ldlm_ns_name(ns), atomic_read(&ns->ns_bref));
1158 rc = wait_event_idle_timeout(
1160 atomic_read(&ns->ns_bref) == 0,
1161 cfs_time_seconds(1) / 4);
1163 rc = l_wait_event_abortable(
1164 ns->ns_waitq, atomic_read(&ns->ns_bref) == 0);
1166 /* Forced cleanups should be able to reclaim all references,
1167 * so it's safe to wait forever... we can't leak locks... */
1168 if (force && rc == 0) {
1170 LCONSOLE_ERROR("Forced cleanup waiting for %s "
1171 "namespace with %d resources in use, "
1172 "(rc=%d)\n", ldlm_ns_name(ns),
1173 atomic_read(&ns->ns_bref), rc);
1174 GOTO(force_wait, rc);
1177 if (atomic_read(&ns->ns_bref)) {
1178 LCONSOLE_ERROR("Cleanup waiting for %s namespace "
1179 "with %d resources in use, (rc=%d)\n",
1181 atomic_read(&ns->ns_bref), rc);
1182 RETURN(ELDLM_NAMESPACE_EXISTS);
1184 CDEBUG(D_DLMTRACE, "dlm namespace %s free done waiting\n",
1192 * Performs various cleanups for passed \a ns to make it drop refc and be
1193 * ready for freeing. Waits for refc == 0.
1195 * The following is done:
1196 * (0) Unregister \a ns from its list to make inaccessible for potential
1197 * users like pools thread and others;
1198 * (1) Clear all locks in \a ns.
1200 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
1201 struct obd_import *imp,
1212 spin_lock(&ns->ns_lock);
1213 ns->ns_stopping = 1;
1214 spin_unlock(&ns->ns_lock);
1217 * Can fail with -EINTR when force == 0 in which case try harder.
1219 rc = __ldlm_namespace_free(ns, force);
1220 if (rc != ELDLM_OK) {
1222 ptlrpc_disconnect_import(imp, 0);
1223 ptlrpc_invalidate_import(imp);
1227 * With all requests dropped and the import inactive
1228 * we are gaurenteed all reference will be dropped.
1230 rc = __ldlm_namespace_free(ns, 1);
1235 EXPORT_SYMBOL(ldlm_namespace_free_prior);
1238 * Performs freeing memory structures related to \a ns. This is only done
1239 * when ldlm_namespce_free_prior() successfully removed all resources
1240 * referencing \a ns and its refc == 0.
1242 void ldlm_namespace_free_post(struct ldlm_namespace *ns)
1250 /* Make sure that nobody can find this ns in its list. */
1251 ldlm_namespace_unregister(ns, ns->ns_client);
1252 /* Fini pool _before_ parent proc dir is removed. This is important as
1253 * ldlm_pool_fini() removes own proc dir which is child to @dir.
1254 * Removing it after @dir may cause oops. */
1255 ldlm_pool_fini(&ns->ns_pool);
1257 ldlm_namespace_debugfs_unregister(ns);
1258 ldlm_namespace_sysfs_unregister(ns);
1259 cfs_hash_putref(ns->ns_rs_hash);
1260 OBD_FREE_LARGE(ns->ns_rs_buckets,
1261 BIT(ns->ns_bucket_bits) * sizeof(ns->ns_rs_buckets[0]));
1263 /* Namespace \a ns should be not on list at this time, otherwise
1264 * this will cause issues related to using freed \a ns in poold
1267 LASSERT(list_empty(&ns->ns_list_chain));
1272 EXPORT_SYMBOL(ldlm_namespace_free_post);
1275 * Cleanup the resource, and free namespace.
1278 * proc1: destroy import
1279 * class_disconnect_export(grab cl_sem) ->
1280 * -> ldlm_namespace_free ->
1281 * -> lprocfs_remove(grab _lprocfs_lock).
1282 * proc2: read proc info
1283 * lprocfs_fops_read(grab _lprocfs_lock) ->
1284 * -> osc_rd_active, etc(grab cl_sem).
1286 * So that I have to split the ldlm_namespace_free into two parts - the first
1287 * part ldlm_namespace_free_prior is used to cleanup the resource which is
1288 * being used; the 2nd part ldlm_namespace_free_post is used to unregister the
1289 * lprocfs entries, and then free memory. It will be called w/o cli->cl_sem
1292 void ldlm_namespace_free(struct ldlm_namespace *ns,
1293 struct obd_import *imp,
1296 ldlm_namespace_free_prior(ns, imp, force);
1297 ldlm_namespace_free_post(ns);
1299 EXPORT_SYMBOL(ldlm_namespace_free);
1301 void ldlm_namespace_get(struct ldlm_namespace *ns)
1303 atomic_inc(&ns->ns_bref);
1306 /* This is only for callers that care about refcount */
1307 static int ldlm_namespace_get_return(struct ldlm_namespace *ns)
1309 return atomic_inc_return(&ns->ns_bref);
1312 void ldlm_namespace_put(struct ldlm_namespace *ns)
1314 if (atomic_dec_and_lock(&ns->ns_bref, &ns->ns_lock)) {
1315 wake_up(&ns->ns_waitq);
1316 spin_unlock(&ns->ns_lock);
1320 /** Register \a ns in the list of namespaces */
1321 void ldlm_namespace_register(struct ldlm_namespace *ns, enum ldlm_side client)
1323 mutex_lock(ldlm_namespace_lock(client));
1324 LASSERT(list_empty(&ns->ns_list_chain));
1325 list_add(&ns->ns_list_chain, ldlm_namespace_inactive_list(client));
1326 ldlm_namespace_nr_inc(client);
1327 mutex_unlock(ldlm_namespace_lock(client));
1330 /** Unregister \a ns from the list of namespaces. */
1331 void ldlm_namespace_unregister(struct ldlm_namespace *ns, enum ldlm_side client)
1333 mutex_lock(ldlm_namespace_lock(client));
1334 LASSERT(!list_empty(&ns->ns_list_chain));
1335 /* Some asserts and possibly other parts of the code are still
1336 * using list_empty(&ns->ns_list_chain). This is why it is
1337 * important to use list_del_init() here. */
1338 list_del_init(&ns->ns_list_chain);
1339 ldlm_namespace_nr_dec(client);
1340 mutex_unlock(ldlm_namespace_lock(client));
1343 /** Should be called with ldlm_namespace_lock(client) taken. */
1344 void ldlm_namespace_move_to_active_locked(struct ldlm_namespace *ns,
1345 enum ldlm_side client)
1347 LASSERT(!list_empty(&ns->ns_list_chain));
1348 LASSERT(mutex_is_locked(ldlm_namespace_lock(client)));
1349 list_move_tail(&ns->ns_list_chain, ldlm_namespace_list(client));
1352 /** Should be called with ldlm_namespace_lock(client) taken. */
1353 void ldlm_namespace_move_to_inactive_locked(struct ldlm_namespace *ns,
1354 enum ldlm_side client)
1356 LASSERT(!list_empty(&ns->ns_list_chain));
1357 LASSERT(mutex_is_locked(ldlm_namespace_lock(client)));
1358 list_move_tail(&ns->ns_list_chain,
1359 ldlm_namespace_inactive_list(client));
1362 /** Should be called with ldlm_namespace_lock(client) taken. */
1363 struct ldlm_namespace *ldlm_namespace_first_locked(enum ldlm_side client)
1365 LASSERT(mutex_is_locked(ldlm_namespace_lock(client)));
1366 LASSERT(!list_empty(ldlm_namespace_list(client)));
1367 return container_of(ldlm_namespace_list(client)->next,
1368 struct ldlm_namespace, ns_list_chain);
1371 static bool ldlm_resource_extent_new(struct ldlm_resource *res)
1375 OBD_SLAB_ALLOC(res->lr_itree, ldlm_interval_tree_slab,
1376 sizeof(*res->lr_itree) * LCK_MODE_NUM);
1377 if (res->lr_itree == NULL)
1379 /* Initialize interval trees for each lock mode. */
1380 for (idx = 0; idx < LCK_MODE_NUM; idx++) {
1381 res->lr_itree[idx].lit_size = 0;
1382 res->lr_itree[idx].lit_mode = 1 << idx;
1383 res->lr_itree[idx].lit_root = NULL;
1388 static bool ldlm_resource_inodebits_new(struct ldlm_resource *res)
1392 OBD_ALLOC_PTR(res->lr_ibits_queues);
1393 if (res->lr_ibits_queues == NULL)
1395 for (i = 0; i < MDS_INODELOCK_NUMBITS; i++)
1396 INIT_LIST_HEAD(&res->lr_ibits_queues->liq_waiting[i]);
1400 /** Create and initialize new resource. */
1401 static struct ldlm_resource *ldlm_resource_new(enum ldlm_type ldlm_type)
1403 struct ldlm_resource *res;
1406 OBD_SLAB_ALLOC_PTR_GFP(res, ldlm_resource_slab, GFP_NOFS);
1410 switch (ldlm_type) {
1412 rc = ldlm_resource_extent_new(res);
1415 rc = ldlm_resource_inodebits_new(res);
1422 OBD_SLAB_FREE_PTR(res, ldlm_resource_slab);
1426 INIT_LIST_HEAD(&res->lr_granted);
1427 INIT_LIST_HEAD(&res->lr_waiting);
1429 atomic_set(&res->lr_refcount, 1);
1430 spin_lock_init(&res->lr_lock);
1431 lu_ref_init(&res->lr_reference);
1433 /* Since LVB init can be delayed now, there is no longer need to
1434 * immediatelly acquire mutex here. */
1435 mutex_init(&res->lr_lvb_mutex);
1436 res->lr_lvb_initialized = false;
1441 static void ldlm_resource_free(struct ldlm_resource *res)
1443 if (res->lr_type == LDLM_EXTENT) {
1444 if (res->lr_itree != NULL)
1445 OBD_SLAB_FREE(res->lr_itree, ldlm_interval_tree_slab,
1446 sizeof(*res->lr_itree) * LCK_MODE_NUM);
1447 } else if (res->lr_type == LDLM_IBITS) {
1448 if (res->lr_ibits_queues != NULL)
1449 OBD_FREE_PTR(res->lr_ibits_queues);
1452 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1456 * Return a reference to resource with given name, creating it if necessary.
1457 * Args: namespace with ns_lock unlocked
1458 * Locks: takes and releases NS hash-lock and res->lr_lock
1459 * Returns: referenced, unlocked ldlm_resource or NULL
1461 struct ldlm_resource *
1462 ldlm_resource_get(struct ldlm_namespace *ns, struct ldlm_resource *parent,
1463 const struct ldlm_res_id *name, enum ldlm_type type,
1466 struct hlist_node *hnode;
1467 struct ldlm_resource *res = NULL;
1468 struct cfs_hash_bd bd;
1470 int ns_refcount = 0;
1473 LASSERT(ns != NULL);
1474 LASSERT(parent == NULL);
1475 LASSERT(ns->ns_rs_hash != NULL);
1476 LASSERT(name->name[0] != 0);
1478 cfs_hash_bd_get_and_lock(ns->ns_rs_hash, (void *)name, &bd, 0);
1479 hnode = cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1480 if (hnode != NULL) {
1481 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1485 version = cfs_hash_bd_version_get(&bd);
1486 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1489 return ERR_PTR(-ENOENT);
1491 LASSERTF(type >= LDLM_MIN_TYPE && type < LDLM_MAX_TYPE,
1492 "type: %d\n", type);
1493 res = ldlm_resource_new(type);
1495 return ERR_PTR(-ENOMEM);
1497 hash = ldlm_res_hop_fid_hash(name, ns->ns_bucket_bits);
1498 res->lr_ns_bucket = &ns->ns_rs_buckets[hash];
1499 res->lr_name = *name;
1500 res->lr_type = type;
1502 cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
1503 hnode = (version == cfs_hash_bd_version_get(&bd)) ? NULL :
1504 cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1506 if (hnode != NULL) {
1507 /* Someone won the race and already added the resource. */
1508 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1509 /* Clean lu_ref for failed resource. */
1510 lu_ref_fini(&res->lr_reference);
1511 ldlm_resource_free(res);
1513 res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
1516 /* We won! Let's add the resource. */
1517 cfs_hash_bd_add_locked(ns->ns_rs_hash, &bd, &res->lr_hash);
1518 if (atomic_inc_return(&res->lr_ns_bucket->nsb_count) == 1)
1519 ns_refcount = ldlm_namespace_get_return(ns);
1521 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1523 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CREATE_RESOURCE, 2);
1525 /* Let's see if we happened to be the very first resource in this
1526 * namespace. If so, and this is a client namespace, we need to move
1527 * the namespace into the active namespaces list to be patrolled by
1528 * the ldlm_poold. */
1529 if (ns_is_client(ns) && ns_refcount == 1) {
1530 mutex_lock(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
1531 ldlm_namespace_move_to_active_locked(ns, LDLM_NAMESPACE_CLIENT);
1532 mutex_unlock(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
1537 EXPORT_SYMBOL(ldlm_resource_get);
1539 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res)
1541 LASSERT(res != NULL);
1542 LASSERT(res != LP_POISON);
1543 atomic_inc(&res->lr_refcount);
1544 CDEBUG(D_INFO, "getref res: %p count: %d\n", res,
1545 atomic_read(&res->lr_refcount));
1549 static void __ldlm_resource_putref_final(struct cfs_hash_bd *bd,
1550 struct ldlm_resource *res)
1552 struct ldlm_ns_bucket *nsb = res->lr_ns_bucket;
1554 if (!list_empty(&res->lr_granted)) {
1555 ldlm_resource_dump(D_ERROR, res);
1559 if (!list_empty(&res->lr_waiting)) {
1560 ldlm_resource_dump(D_ERROR, res);
1564 cfs_hash_bd_del_locked(nsb->nsb_namespace->ns_rs_hash,
1566 lu_ref_fini(&res->lr_reference);
1567 if (atomic_dec_and_test(&nsb->nsb_count))
1568 ldlm_namespace_put(nsb->nsb_namespace);
1571 /* Returns 1 if the resource was freed, 0 if it remains. */
1572 int ldlm_resource_putref(struct ldlm_resource *res)
1574 struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1575 struct cfs_hash_bd bd;
1577 LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
1578 CDEBUG(D_INFO, "putref res: %p count: %d\n",
1579 res, atomic_read(&res->lr_refcount) - 1);
1581 cfs_hash_bd_get(ns->ns_rs_hash, &res->lr_name, &bd);
1582 if (cfs_hash_bd_dec_and_lock(ns->ns_rs_hash, &bd, &res->lr_refcount)) {
1583 __ldlm_resource_putref_final(&bd, res);
1584 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1585 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
1586 ns->ns_lvbo->lvbo_free(res);
1587 ldlm_resource_free(res);
1592 EXPORT_SYMBOL(ldlm_resource_putref);
1595 * Add a lock into a given resource into specified lock list.
1597 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
1598 struct ldlm_lock *lock)
1600 check_res_locked(res);
1602 LDLM_DEBUG(lock, "About to add this lock");
1604 if (ldlm_is_destroyed(lock)) {
1605 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1609 LASSERT(list_empty(&lock->l_res_link));
1611 list_add_tail(&lock->l_res_link, head);
1613 if (res->lr_type == LDLM_IBITS)
1614 ldlm_inodebits_add_lock(res, head, lock);
1618 * Insert a lock into resource after specified lock.
1620 * Obtain resource description from the lock we are inserting after.
1622 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
1623 struct ldlm_lock *new)
1625 struct ldlm_resource *res = original->l_resource;
1627 check_res_locked(res);
1629 ldlm_resource_dump(D_INFO, res);
1630 LDLM_DEBUG(new, "About to insert this lock after %p: ", original);
1632 if (ldlm_is_destroyed(new)) {
1633 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1637 LASSERT(list_empty(&new->l_res_link));
1639 list_add(&new->l_res_link, &original->l_res_link);
1643 void ldlm_resource_unlink_lock(struct ldlm_lock *lock)
1645 int type = lock->l_resource->lr_type;
1647 check_res_locked(lock->l_resource);
1650 ldlm_unlink_lock_skiplist(lock);
1653 ldlm_extent_unlink_lock(lock);
1656 ldlm_inodebits_unlink_lock(lock);
1659 list_del_init(&lock->l_res_link);
1661 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
1663 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc)
1665 desc->lr_type = res->lr_type;
1666 desc->lr_name = res->lr_name;
1670 * Print information about all locks in all namespaces on this node to debug
1673 void ldlm_dump_all_namespaces(enum ldlm_side client, int level)
1675 struct list_head *tmp;
1677 if (!((libcfs_debug | D_ERROR) & level))
1680 mutex_lock(ldlm_namespace_lock(client));
1682 list_for_each(tmp, ldlm_namespace_list(client)) {
1683 struct ldlm_namespace *ns;
1685 ns = list_entry(tmp, struct ldlm_namespace, ns_list_chain);
1686 ldlm_namespace_dump(level, ns);
1689 mutex_unlock(ldlm_namespace_lock(client));
1692 static int ldlm_res_hash_dump(struct cfs_hash *hs, struct cfs_hash_bd *bd,
1693 struct hlist_node *hnode, void *arg)
1695 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1696 int level = (int)(unsigned long)arg;
1699 ldlm_resource_dump(level, res);
1706 * Print information about all locks in this namespace on this node to debug
1709 void ldlm_namespace_dump(int level, struct ldlm_namespace *ns)
1711 if (!((libcfs_debug | D_ERROR) & level))
1714 CDEBUG(level, "--- Namespace: %s (rc: %d, side: %s)\n",
1715 ldlm_ns_name(ns), atomic_read(&ns->ns_bref),
1716 ns_is_client(ns) ? "client" : "server");
1718 if (ktime_get_seconds() < ns->ns_next_dump)
1721 cfs_hash_for_each_nolock(ns->ns_rs_hash,
1723 (void *)(unsigned long)level, 0);
1724 spin_lock(&ns->ns_lock);
1725 ns->ns_next_dump = ktime_get_seconds() + 10;
1726 spin_unlock(&ns->ns_lock);
1730 * Print information about all locks in this resource to debug log.
1732 void ldlm_resource_dump(int level, struct ldlm_resource *res)
1734 struct ldlm_lock *lock;
1735 unsigned int granted = 0;
1737 BUILD_BUG_ON(RES_NAME_SIZE != 4);
1739 if (!((libcfs_debug | D_ERROR) & level))
1742 CDEBUG(level, "--- Resource: "DLDLMRES" (%p) refcount = %d\n",
1743 PLDLMRES(res), res, atomic_read(&res->lr_refcount));
1745 if (!list_empty(&res->lr_granted)) {
1746 CDEBUG(level, "Granted locks (in reverse order):\n");
1747 list_for_each_entry_reverse(lock, &res->lr_granted,
1749 LDLM_DEBUG_LIMIT(level, lock, "###");
1750 if (!(level & D_CANTMASK) &&
1751 ++granted > ldlm_dump_granted_max) {
1753 "only dump %d granted locks to avoid DDOS.\n",
1760 if (!list_empty(&res->lr_waiting)) {
1761 CDEBUG(level, "Waiting locks:\n");
1762 list_for_each_entry(lock, &res->lr_waiting, l_res_link)
1763 LDLM_DEBUG_LIMIT(level, lock, "###");
1766 EXPORT_SYMBOL(ldlm_resource_dump);