1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/ldlm/ldlm_resource.c
38 * Author: Phil Schwan <phil@clusterfs.com>
39 * Author: Peter Braam <braam@clusterfs.com>
42 #define DEBUG_SUBSYSTEM S_LDLM
44 # include <lustre_dlm.h>
46 # include <liblustre.h>
49 #include <lustre_fid.h>
50 #include <obd_class.h>
51 #include "ldlm_internal.h"
53 cfs_mem_cache_t *ldlm_resource_slab, *ldlm_lock_slab;
55 cfs_atomic_t ldlm_srv_namespace_nr = CFS_ATOMIC_INIT(0);
56 cfs_atomic_t ldlm_cli_namespace_nr = CFS_ATOMIC_INIT(0);
58 cfs_semaphore_t ldlm_srv_namespace_lock;
59 CFS_LIST_HEAD(ldlm_srv_namespace_list);
61 cfs_semaphore_t ldlm_cli_namespace_lock;
62 CFS_LIST_HEAD(ldlm_cli_namespace_list);
64 cfs_proc_dir_entry_t *ldlm_type_proc_dir = NULL;
65 cfs_proc_dir_entry_t *ldlm_ns_proc_dir = NULL;
66 cfs_proc_dir_entry_t *ldlm_svc_proc_dir = NULL;
68 extern unsigned int ldlm_cancel_unused_locks_before_replay;
71 static int ldlm_proc_dump_ns(struct file *file, const char *buffer,
72 unsigned long count, void *data)
74 ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
75 ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
79 int ldlm_proc_setup(void)
82 struct lprocfs_vars list[] = {
83 { "dump_namespaces", NULL, ldlm_proc_dump_ns, NULL },
84 { "cancel_unused_locks_before_replay",
85 lprocfs_rd_uint, lprocfs_wr_uint,
86 &ldlm_cancel_unused_locks_before_replay, NULL },
89 LASSERT(ldlm_ns_proc_dir == NULL);
91 ldlm_type_proc_dir = lprocfs_register(OBD_LDLM_DEVICENAME,
94 if (IS_ERR(ldlm_type_proc_dir)) {
95 CERROR("LProcFS failed in ldlm-init\n");
96 rc = PTR_ERR(ldlm_type_proc_dir);
100 ldlm_ns_proc_dir = lprocfs_register("namespaces",
103 if (IS_ERR(ldlm_ns_proc_dir)) {
104 CERROR("LProcFS failed in ldlm-init\n");
105 rc = PTR_ERR(ldlm_ns_proc_dir);
109 ldlm_svc_proc_dir = lprocfs_register("services",
112 if (IS_ERR(ldlm_svc_proc_dir)) {
113 CERROR("LProcFS failed in ldlm-init\n");
114 rc = PTR_ERR(ldlm_svc_proc_dir);
118 rc = lprocfs_add_vars(ldlm_type_proc_dir, list, NULL);
123 lprocfs_remove(&ldlm_ns_proc_dir);
125 lprocfs_remove(&ldlm_type_proc_dir);
127 ldlm_svc_proc_dir = NULL;
131 void ldlm_proc_cleanup(void)
133 if (ldlm_svc_proc_dir)
134 lprocfs_remove(&ldlm_svc_proc_dir);
136 if (ldlm_ns_proc_dir)
137 lprocfs_remove(&ldlm_ns_proc_dir);
139 if (ldlm_type_proc_dir)
140 lprocfs_remove(&ldlm_type_proc_dir);
143 static int lprocfs_rd_ns_resources(char *page, char **start, off_t off,
144 int count, int *eof, void *data)
146 struct ldlm_namespace *ns = data;
151 /* result is not strictly consistant */
152 cfs_hash_for_each_bucket(ns->ns_rs_hash, &bd, i)
153 res += cfs_hash_bd_count_get(&bd);
154 return lprocfs_rd_u64(page, start, off, count, eof, &res);
157 static int lprocfs_rd_ns_locks(char *page, char **start, off_t off,
158 int count, int *eof, void *data)
160 struct ldlm_namespace *ns = data;
163 locks = lprocfs_stats_collector(ns->ns_stats, LDLM_NSS_LOCKS,
164 LPROCFS_FIELDS_FLAGS_SUM);
165 return lprocfs_rd_u64(page, start, off, count, eof, &locks);
168 static int lprocfs_rd_lru_size(char *page, char **start, off_t off,
169 int count, int *eof, void *data)
171 struct ldlm_namespace *ns = data;
172 __u32 *nr = &ns->ns_max_unused;
174 if (ns_connect_lru_resize(ns))
175 nr = &ns->ns_nr_unused;
176 return lprocfs_rd_uint(page, start, off, count, eof, nr);
179 static int lprocfs_wr_lru_size(struct file *file, const char *buffer,
180 unsigned long count, void *data)
182 struct ldlm_namespace *ns = data;
183 char dummy[MAX_STRING_SIZE + 1], *end;
187 dummy[MAX_STRING_SIZE] = '\0';
188 if (cfs_copy_from_user(dummy, buffer, MAX_STRING_SIZE))
191 if (strncmp(dummy, "clear", 5) == 0) {
193 "dropping all unused locks from namespace %s\n",
195 if (ns_connect_lru_resize(ns)) {
196 int canceled, unused = ns->ns_nr_unused;
198 /* Try to cancel all @ns_nr_unused locks. */
199 canceled = ldlm_cancel_lru(ns, unused, LDLM_SYNC,
201 if (canceled < unused) {
203 "not all requested locks are canceled, "
204 "requested: %d, canceled: %d\n", unused,
209 tmp = ns->ns_max_unused;
210 ns->ns_max_unused = 0;
211 ldlm_cancel_lru(ns, 0, LDLM_SYNC, LDLM_CANCEL_PASSED);
212 ns->ns_max_unused = tmp;
217 tmp = simple_strtoul(dummy, &end, 0);
219 CERROR("invalid value written\n");
222 lru_resize = (tmp == 0);
224 if (ns_connect_lru_resize(ns)) {
226 ns->ns_max_unused = (unsigned int)tmp;
228 if (tmp > ns->ns_nr_unused)
229 tmp = ns->ns_nr_unused;
230 tmp = ns->ns_nr_unused - tmp;
233 "changing namespace %s unused locks from %u to %u\n",
234 ldlm_ns_name(ns), ns->ns_nr_unused,
236 ldlm_cancel_lru(ns, tmp, LDLM_ASYNC, LDLM_CANCEL_PASSED);
240 "disable lru_resize for namespace %s\n",
242 ns->ns_connect_flags &= ~OBD_CONNECT_LRU_RESIZE;
246 "changing namespace %s max_unused from %u to %u\n",
247 ldlm_ns_name(ns), ns->ns_max_unused,
249 ns->ns_max_unused = (unsigned int)tmp;
250 ldlm_cancel_lru(ns, 0, LDLM_ASYNC, LDLM_CANCEL_PASSED);
252 /* Make sure that originally lru resize was supported before
253 * turning it on here. */
255 (ns->ns_orig_connect_flags & OBD_CONNECT_LRU_RESIZE)) {
257 "enable lru_resize for namespace %s\n",
259 ns->ns_connect_flags |= OBD_CONNECT_LRU_RESIZE;
266 void ldlm_namespace_proc_unregister(struct ldlm_namespace *ns)
268 struct proc_dir_entry *dir;
270 dir = lprocfs_srch(ldlm_ns_proc_dir, ldlm_ns_name(ns));
272 CERROR("dlm namespace %s has no procfs dir?\n",
275 lprocfs_remove(&dir);
278 if (ns->ns_stats != NULL)
279 lprocfs_free_stats(&ns->ns_stats);
282 int ldlm_namespace_proc_register(struct ldlm_namespace *ns)
284 struct lprocfs_vars lock_vars[2];
285 char lock_name[MAX_STRING_SIZE + 1];
288 LASSERT(ns->ns_rs_hash != NULL);
290 ns->ns_stats = lprocfs_alloc_stats(LDLM_NSS_LAST, 0);
291 if (ns->ns_stats == NULL)
294 lprocfs_counter_init(ns->ns_stats, LDLM_NSS_LOCKS,
295 LPROCFS_CNTR_AVGMINMAX, "locks", "locks");
297 lock_name[MAX_STRING_SIZE] = '\0';
299 memset(lock_vars, 0, sizeof(lock_vars));
300 lock_vars[0].name = lock_name;
302 snprintf(lock_name, MAX_STRING_SIZE, "%s/resource_count",
304 lock_vars[0].data = ns;
305 lock_vars[0].read_fptr = lprocfs_rd_ns_resources;
306 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
308 snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_count",
310 lock_vars[0].data = ns;
311 lock_vars[0].read_fptr = lprocfs_rd_ns_locks;
312 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
314 if (ns_is_client(ns)) {
315 snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_unused_count",
317 lock_vars[0].data = &ns->ns_nr_unused;
318 lock_vars[0].read_fptr = lprocfs_rd_uint;
319 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
321 snprintf(lock_name, MAX_STRING_SIZE, "%s/lru_size",
323 lock_vars[0].data = ns;
324 lock_vars[0].read_fptr = lprocfs_rd_lru_size;
325 lock_vars[0].write_fptr = lprocfs_wr_lru_size;
326 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
328 snprintf(lock_name, MAX_STRING_SIZE, "%s/lru_max_age",
330 lock_vars[0].data = &ns->ns_max_age;
331 lock_vars[0].read_fptr = lprocfs_rd_uint;
332 lock_vars[0].write_fptr = lprocfs_wr_uint;
333 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
335 snprintf(lock_name, MAX_STRING_SIZE, "%s/ctime_age_limit",
337 lock_vars[0].data = &ns->ns_ctime_age_limit;
338 lock_vars[0].read_fptr = lprocfs_rd_uint;
339 lock_vars[0].write_fptr = lprocfs_wr_uint;
340 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
342 snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_timeouts",
344 lock_vars[0].data = &ns->ns_timeouts;
345 lock_vars[0].read_fptr = lprocfs_rd_uint;
346 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
348 snprintf(lock_name, MAX_STRING_SIZE, "%s/max_nolock_bytes",
350 lock_vars[0].data = &ns->ns_max_nolock_size;
351 lock_vars[0].read_fptr = lprocfs_rd_uint;
352 lock_vars[0].write_fptr = lprocfs_wr_uint;
353 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
355 snprintf(lock_name, MAX_STRING_SIZE, "%s/contention_seconds",
357 lock_vars[0].data = &ns->ns_contention_time;
358 lock_vars[0].read_fptr = lprocfs_rd_uint;
359 lock_vars[0].write_fptr = lprocfs_wr_uint;
360 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
362 snprintf(lock_name, MAX_STRING_SIZE, "%s/contended_locks",
364 lock_vars[0].data = &ns->ns_contended_locks;
365 lock_vars[0].read_fptr = lprocfs_rd_uint;
366 lock_vars[0].write_fptr = lprocfs_wr_uint;
367 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
371 #undef MAX_STRING_SIZE
374 #define ldlm_namespace_proc_unregister(ns) ({;})
375 #define ldlm_namespace_proc_register(ns) ({0;})
379 static unsigned ldlm_res_hop_hash(cfs_hash_t *hs,
380 const void *key, unsigned mask)
382 const struct ldlm_res_id *id = key;
386 for (i = 0; i < RES_NAME_SIZE; i++)
391 static unsigned ldlm_res_hop_fid_hash(cfs_hash_t *hs,
392 const void *key, unsigned mask)
394 const struct ldlm_res_id *id = key;
398 fid.f_seq = id->name[LUSTRE_RES_ID_SEQ_OFF];
399 fid.f_oid = (__u32)id->name[LUSTRE_RES_ID_OID_OFF];
400 fid.f_ver = (__u32)id->name[LUSTRE_RES_ID_VER_OFF];
402 hash = fid_flatten(&fid);
403 hash = cfs_hash_long(hash, hs->hs_bkt_bits);
404 /* ignore a few low bits */
405 if (id->name[LUSTRE_RES_ID_HSH_OFF] != 0)
406 hash += id->name[LUSTRE_RES_ID_HSH_OFF] >> 5;
409 hash <<= hs->hs_cur_bits - hs->hs_bkt_bits;
410 hash |= ldlm_res_hop_hash(hs, key, CFS_HASH_NBKT(hs) - 1);
415 static void *ldlm_res_hop_key(cfs_hlist_node_t *hnode)
417 struct ldlm_resource *res;
419 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
420 return &res->lr_name;
423 static int ldlm_res_eq(const struct ldlm_res_id *res0,
424 const struct ldlm_res_id *res1)
426 return !memcmp(res0, res1, sizeof(*res0));
429 static int ldlm_res_hop_keycmp(const void *key, cfs_hlist_node_t *hnode)
431 struct ldlm_resource *res;
433 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
434 return ldlm_res_eq((const struct ldlm_res_id *)key,
435 (const struct ldlm_res_id *)&res->lr_name);
438 static void *ldlm_res_hop_object(cfs_hlist_node_t *hnode)
440 return cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
443 static void ldlm_res_hop_get_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
445 struct ldlm_resource *res;
447 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
448 ldlm_resource_getref(res);
449 LDLM_RESOURCE_ADDREF(res);
452 static void ldlm_res_hop_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
454 struct ldlm_resource *res;
456 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
457 /* cfs_hash_for_each_nolock is the only chance we call it */
458 LDLM_RESOURCE_DELREF(res);
459 ldlm_resource_putref_locked(res);
462 static void ldlm_res_hop_put(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
464 struct ldlm_resource *res;
466 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
467 LDLM_RESOURCE_DELREF(res);
468 ldlm_resource_putref(res);
471 cfs_hash_ops_t ldlm_ns_hash_ops = {
472 .hs_hash = ldlm_res_hop_hash,
473 .hs_key = ldlm_res_hop_key,
474 .hs_keycmp = ldlm_res_hop_keycmp,
476 .hs_object = ldlm_res_hop_object,
477 .hs_get = ldlm_res_hop_get_locked,
478 .hs_put_locked = ldlm_res_hop_put_locked,
479 .hs_put = ldlm_res_hop_put
482 cfs_hash_ops_t ldlm_ns_fid_hash_ops = {
483 .hs_hash = ldlm_res_hop_fid_hash,
484 .hs_key = ldlm_res_hop_key,
485 .hs_keycmp = ldlm_res_hop_keycmp,
487 .hs_object = ldlm_res_hop_object,
488 .hs_get = ldlm_res_hop_get_locked,
489 .hs_put_locked = ldlm_res_hop_put_locked,
490 .hs_put = ldlm_res_hop_put
494 ldlm_ns_type_t nsd_type;
495 /** hash bucket bits */
496 unsigned nsd_bkt_bits;
498 unsigned nsd_all_bits;
499 /** hash operations */
500 cfs_hash_ops_t *nsd_hops;
501 } ldlm_ns_hash_def_t;
503 ldlm_ns_hash_def_t ldlm_ns_hash_defs[] =
506 .nsd_type = LDLM_NS_TYPE_MDC,
509 .nsd_hops = &ldlm_ns_fid_hash_ops,
512 .nsd_type = LDLM_NS_TYPE_MDT,
515 .nsd_hops = &ldlm_ns_fid_hash_ops,
518 .nsd_type = LDLM_NS_TYPE_OSC,
521 .nsd_hops = &ldlm_ns_hash_ops,
524 .nsd_type = LDLM_NS_TYPE_OST,
527 .nsd_hops = &ldlm_ns_hash_ops,
530 .nsd_type = LDLM_NS_TYPE_MGC,
533 .nsd_hops = &ldlm_ns_hash_ops,
536 .nsd_type = LDLM_NS_TYPE_MGT,
539 .nsd_hops = &ldlm_ns_hash_ops,
542 .nsd_type = LDLM_NS_TYPE_UNKNOWN,
546 struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
549 ldlm_ns_type_t ns_type)
551 struct ldlm_namespace *ns = NULL;
552 struct ldlm_ns_bucket *nsb;
553 ldlm_ns_hash_def_t *nsd;
559 LASSERT(obd != NULL);
563 CERROR("ldlm_get_ref failed: %d\n", rc);
567 for (idx = 0;;idx++) {
568 nsd = &ldlm_ns_hash_defs[idx];
569 if (nsd->nsd_type == LDLM_NS_TYPE_UNKNOWN) {
570 CERROR("Unknown type %d for ns %s\n", ns_type, name);
574 if (nsd->nsd_type == ns_type)
582 ns->ns_rs_hash = cfs_hash_create(name,
583 nsd->nsd_all_bits, nsd->nsd_all_bits,
584 nsd->nsd_bkt_bits, sizeof(*nsb),
590 CFS_HASH_SPIN_BKTLOCK |
591 CFS_HASH_NO_ITEMREF);
592 if (ns->ns_rs_hash == NULL)
595 cfs_hash_for_each_bucket(ns->ns_rs_hash, &bd, idx) {
596 nsb = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
597 at_init(&nsb->nsb_at_estimate, ldlm_enqueue_min, 0);
598 nsb->nsb_namespace = ns;
602 ns->ns_appetite = apt;
603 ns->ns_client = client;
605 CFS_INIT_LIST_HEAD(&ns->ns_list_chain);
606 CFS_INIT_LIST_HEAD(&ns->ns_unused_list);
607 cfs_spin_lock_init(&ns->ns_lock);
608 cfs_atomic_set(&ns->ns_bref, 0);
609 cfs_waitq_init(&ns->ns_waitq);
611 ns->ns_max_nolock_size = NS_DEFAULT_MAX_NOLOCK_BYTES;
612 ns->ns_contention_time = NS_DEFAULT_CONTENTION_SECONDS;
613 ns->ns_contended_locks = NS_DEFAULT_CONTENDED_LOCKS;
615 ns->ns_nr_unused = 0;
616 ns->ns_max_unused = LDLM_DEFAULT_LRU_SIZE;
617 ns->ns_max_age = LDLM_DEFAULT_MAX_ALIVE;
618 ns->ns_ctime_age_limit = LDLM_CTIME_AGE_LIMIT;
620 ns->ns_orig_connect_flags = 0;
621 ns->ns_connect_flags = 0;
622 rc = ldlm_namespace_proc_register(ns);
624 CERROR("Can't initialize ns proc, rc %d\n", rc);
628 idx = cfs_atomic_read(ldlm_namespace_nr(client));
629 rc = ldlm_pool_init(&ns->ns_pool, ns, idx, client);
631 CERROR("Can't initialize lock pool, rc %d\n", rc);
635 ldlm_namespace_register(ns, client);
638 ldlm_namespace_proc_unregister(ns);
639 ldlm_namespace_cleanup(ns, 0);
641 cfs_hash_putref(ns->ns_rs_hash);
649 extern struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
651 /* If flags contains FL_LOCAL_ONLY, don't try to tell the server, just cleanup.
652 * This is currently only used for recovery, and we make certain assumptions
653 * as a result--notably, that we shouldn't cancel locks with refs. -phil */
654 static void cleanup_resource(struct ldlm_resource *res, cfs_list_t *q,
658 int rc = 0, client = ns_is_client(ldlm_res_to_ns(res));
659 int local_only = (flags & LDLM_FL_LOCAL_ONLY);
662 struct ldlm_lock *lock = NULL;
664 /* first, we look for non-cleaned-yet lock
665 * all cleaned locks are marked by CLEANED flag */
667 cfs_list_for_each(tmp, q) {
668 lock = cfs_list_entry(tmp, struct ldlm_lock,
670 if (lock->l_flags & LDLM_FL_CLEANED) {
675 lock->l_flags |= LDLM_FL_CLEANED;
684 /* Set CBPENDING so nothing in the cancellation path
685 * can match this lock */
686 lock->l_flags |= LDLM_FL_CBPENDING;
687 lock->l_flags |= LDLM_FL_FAILED;
688 lock->l_flags |= flags;
690 /* ... without sending a CANCEL message for local_only. */
692 lock->l_flags |= LDLM_FL_LOCAL_ONLY;
694 if (local_only && (lock->l_readers || lock->l_writers)) {
695 /* This is a little bit gross, but much better than the
696 * alternative: pretend that we got a blocking AST from
697 * the server, so that when the lock is decref'd, it
698 * will go away ... */
700 LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
701 if (lock->l_completion_ast)
702 lock->l_completion_ast(lock, 0, NULL);
703 LDLM_LOCK_RELEASE(lock);
708 struct lustre_handle lockh;
711 ldlm_lock2handle(lock, &lockh);
712 rc = ldlm_cli_cancel(&lockh);
714 CERROR("ldlm_cli_cancel: %d\n", rc);
716 ldlm_resource_unlink_lock(lock);
718 LDLM_DEBUG(lock, "Freeing a lock still held by a "
720 ldlm_lock_destroy(lock);
722 LDLM_LOCK_RELEASE(lock);
726 static int ldlm_resource_clean(cfs_hash_t *hs, cfs_hash_bd_t *bd,
727 cfs_hlist_node_t *hnode, void *arg)
729 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
730 int flags = (int)(unsigned long)arg;
732 cleanup_resource(res, &res->lr_granted, flags);
733 cleanup_resource(res, &res->lr_converting, flags);
734 cleanup_resource(res, &res->lr_waiting, flags);
739 static int ldlm_resource_complain(cfs_hash_t *hs, cfs_hash_bd_t *bd,
740 cfs_hlist_node_t *hnode, void *arg)
742 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
744 CERROR("Namespace %s resource refcount nonzero "
745 "(%d) after lock cleanup; forcing "
747 ldlm_ns_name(ldlm_res_to_ns(res)),
748 cfs_atomic_read(&res->lr_refcount) - 1);
750 CERROR("Resource: %p ("LPU64"/"LPU64"/"LPU64"/"
751 LPU64") (rc: %d)\n", res,
752 res->lr_name.name[0], res->lr_name.name[1],
753 res->lr_name.name[2], res->lr_name.name[3],
754 cfs_atomic_read(&res->lr_refcount) - 1);
758 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, int flags)
761 CDEBUG(D_INFO, "NULL ns, skipping cleanup\n");
765 cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_clean,
766 (void *)(unsigned long)flags);
767 cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_complain, NULL);
771 static int __ldlm_namespace_free(struct ldlm_namespace *ns, int force)
775 /* At shutdown time, don't call the cancellation callback */
776 ldlm_namespace_cleanup(ns, force ? LDLM_FL_LOCAL_ONLY : 0);
778 if (cfs_atomic_read(&ns->ns_bref) > 0) {
779 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
782 "dlm namespace %s free waiting on refcount %d\n",
783 ldlm_ns_name(ns), cfs_atomic_read(&ns->ns_bref));
786 lwi = LWI_TIMEOUT(obd_timeout * CFS_HZ / 4, NULL, NULL);
788 rc = l_wait_event(ns->ns_waitq,
789 cfs_atomic_read(&ns->ns_bref) == 0, &lwi);
791 /* Forced cleanups should be able to reclaim all references,
792 * so it's safe to wait forever... we can't leak locks... */
793 if (force && rc == -ETIMEDOUT) {
794 LCONSOLE_ERROR("Forced cleanup waiting for %s "
795 "namespace with %d resources in use, "
796 "(rc=%d)\n", ldlm_ns_name(ns),
797 cfs_atomic_read(&ns->ns_bref), rc);
798 GOTO(force_wait, rc);
801 if (cfs_atomic_read(&ns->ns_bref)) {
802 LCONSOLE_ERROR("Cleanup waiting for %s namespace "
803 "with %d resources in use, (rc=%d)\n",
805 cfs_atomic_read(&ns->ns_bref), rc);
806 RETURN(ELDLM_NAMESPACE_EXISTS);
808 CDEBUG(D_DLMTRACE, "dlm namespace %s free done waiting\n",
816 * Performs various cleanups for passed \a ns to make it drop refc and be ready
817 * for freeing. Waits for refc == 0.
819 * The following is done:
820 * (0) Unregister \a ns from its list to make inaccessible for potential users
821 * like pools thread and others;
822 * (1) Clear all locks in \a ns.
824 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
825 struct obd_import *imp,
837 * Can fail with -EINTR when force == 0 in which case try harder.
839 rc = __ldlm_namespace_free(ns, force);
840 if (rc != ELDLM_OK) {
842 ptlrpc_disconnect_import(imp, 0);
843 ptlrpc_invalidate_import(imp);
847 * With all requests dropped and the import inactive
848 * we are gaurenteed all reference will be dropped.
850 rc = __ldlm_namespace_free(ns, 1);
857 * Performs freeing memory structures related to \a ns. This is only done when
858 * ldlm_namespce_free_prior() successfully removed all resources referencing
859 * \a ns and its refc == 0.
861 void ldlm_namespace_free_post(struct ldlm_namespace *ns)
871 * Make sure that nobody can find this ns in its list.
873 ldlm_namespace_unregister(ns, ns->ns_client);
875 * Fini pool _before_ parent proc dir is removed. This is important as
876 * ldlm_pool_fini() removes own proc dir which is child to @dir. Removing
877 * it after @dir may cause oops.
879 ldlm_pool_fini(&ns->ns_pool);
881 ldlm_namespace_proc_unregister(ns);
882 cfs_hash_putref(ns->ns_rs_hash);
884 * Namespace \a ns should be not on list in this time, otherwise this
885 * will cause issues realted to using freed \a ns in pools thread.
887 LASSERT(cfs_list_empty(&ns->ns_list_chain));
894 /* Cleanup the resource, and free namespace.
897 * proc1: destroy import
898 * class_disconnect_export(grab cl_sem) ->
899 * -> ldlm_namespace_free ->
900 * -> lprocfs_remove(grab _lprocfs_lock).
901 * proc2: read proc info
902 * lprocfs_fops_read(grab _lprocfs_lock) ->
903 * -> osc_rd_active, etc(grab cl_sem).
905 * So that I have to split the ldlm_namespace_free into two parts - the first
906 * part ldlm_namespace_free_prior is used to cleanup the resource which is
907 * being used; the 2nd part ldlm_namespace_free_post is used to unregister the
908 * lprocfs entries, and then free memory. It will be called w/o cli->cl_sem
911 void ldlm_namespace_free(struct ldlm_namespace *ns,
912 struct obd_import *imp,
915 ldlm_namespace_free_prior(ns, imp, force);
916 ldlm_namespace_free_post(ns);
919 void ldlm_namespace_get(struct ldlm_namespace *ns)
921 cfs_atomic_inc(&ns->ns_bref);
924 void ldlm_namespace_put(struct ldlm_namespace *ns)
926 if (cfs_atomic_dec_and_lock(&ns->ns_bref, &ns->ns_lock)) {
927 cfs_waitq_signal(&ns->ns_waitq);
928 cfs_spin_unlock(&ns->ns_lock);
932 /* Register @ns in the list of namespaces */
933 void ldlm_namespace_register(struct ldlm_namespace *ns, ldlm_side_t client)
935 cfs_mutex_down(ldlm_namespace_lock(client));
936 LASSERT(cfs_list_empty(&ns->ns_list_chain));
937 cfs_list_add(&ns->ns_list_chain, ldlm_namespace_list(client));
938 cfs_atomic_inc(ldlm_namespace_nr(client));
939 cfs_mutex_up(ldlm_namespace_lock(client));
942 /* Unregister @ns from the list of namespaces */
943 void ldlm_namespace_unregister(struct ldlm_namespace *ns, ldlm_side_t client)
945 cfs_mutex_down(ldlm_namespace_lock(client));
946 LASSERT(!cfs_list_empty(&ns->ns_list_chain));
948 * Some asserts and possibly other parts of code still using
949 * list_empty(&ns->ns_list_chain). This is why it is important
950 * to use list_del_init() here.
952 cfs_list_del_init(&ns->ns_list_chain);
953 cfs_atomic_dec(ldlm_namespace_nr(client));
954 cfs_mutex_up(ldlm_namespace_lock(client));
957 /* Should be called under ldlm_namespace_lock(client) taken */
958 void ldlm_namespace_move_locked(struct ldlm_namespace *ns, ldlm_side_t client)
960 LASSERT(!cfs_list_empty(&ns->ns_list_chain));
961 LASSERT_SEM_LOCKED(ldlm_namespace_lock(client));
962 cfs_list_move_tail(&ns->ns_list_chain, ldlm_namespace_list(client));
965 /* Should be called under ldlm_namespace_lock(client) taken */
966 struct ldlm_namespace *ldlm_namespace_first_locked(ldlm_side_t client)
968 LASSERT_SEM_LOCKED(ldlm_namespace_lock(client));
969 LASSERT(!cfs_list_empty(ldlm_namespace_list(client)));
970 return container_of(ldlm_namespace_list(client)->next,
971 struct ldlm_namespace, ns_list_chain);
974 static struct ldlm_resource *ldlm_resource_new(void)
976 struct ldlm_resource *res;
979 OBD_SLAB_ALLOC_PTR_GFP(res, ldlm_resource_slab, CFS_ALLOC_IO);
983 CFS_INIT_LIST_HEAD(&res->lr_granted);
984 CFS_INIT_LIST_HEAD(&res->lr_converting);
985 CFS_INIT_LIST_HEAD(&res->lr_waiting);
987 /* initialize interval trees for each lock mode*/
988 for (idx = 0; idx < LCK_MODE_NUM; idx++) {
989 res->lr_itree[idx].lit_size = 0;
990 res->lr_itree[idx].lit_mode = 1 << idx;
991 res->lr_itree[idx].lit_root = NULL;
994 cfs_atomic_set(&res->lr_refcount, 1);
995 cfs_spin_lock_init(&res->lr_lock);
996 lu_ref_init(&res->lr_reference);
998 /* one who creates the resource must unlock
999 * the semaphore after lvb initialization */
1000 cfs_init_mutex_locked(&res->lr_lvb_sem);
1005 /* Args: unlocked namespace
1006 * * Locks: takes and releases NS hash-lock and res->lr_lock
1007 * * Returns: referenced, unlocked ldlm_resource or NULL */
1008 struct ldlm_resource *
1009 ldlm_resource_get(struct ldlm_namespace *ns, struct ldlm_resource *parent,
1010 const struct ldlm_res_id *name, ldlm_type_t type, int create)
1012 cfs_hlist_node_t *hnode;
1013 struct ldlm_resource *res;
1017 LASSERT(ns != NULL);
1018 LASSERT(parent == NULL);
1019 LASSERT(ns->ns_rs_hash != NULL);
1020 LASSERT(name->name[0] != 0);
1022 cfs_hash_bd_get_and_lock(ns->ns_rs_hash, (void *)name, &bd, 0);
1023 hnode = cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1024 if (hnode != NULL) {
1025 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1026 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
1027 /* synchronize WRT resource creation */
1028 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1029 cfs_down(&res->lr_lvb_sem);
1030 cfs_up(&res->lr_lvb_sem);
1035 version = cfs_hash_bd_version_get(&bd);
1036 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1041 LASSERTF(type >= LDLM_MIN_TYPE && type < LDLM_MAX_TYPE,
1042 "type: %d\n", type);
1043 res = ldlm_resource_new();
1047 res->lr_ns_bucket = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
1048 res->lr_name = *name;
1049 res->lr_type = type;
1050 res->lr_most_restr = LCK_NL;
1052 cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
1053 hnode = (version == cfs_hash_bd_version_get(&bd)) ? NULL :
1054 cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1056 if (hnode != NULL) {
1057 /* someone won the race and added the resource before */
1058 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1059 /* clean lu_ref for failed resource */
1060 lu_ref_fini(&res->lr_reference);
1061 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1063 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
1064 /* synchronize WRT resource creation */
1065 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1066 cfs_down(&res->lr_lvb_sem);
1067 cfs_up(&res->lr_lvb_sem);
1071 /* we won! let's add the resource */
1072 cfs_hash_bd_add_locked(ns->ns_rs_hash, &bd, &res->lr_hash);
1073 if (cfs_hash_bd_count_get(&bd) == 1)
1074 ldlm_namespace_get(ns);
1076 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1077 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1080 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CREATE_RESOURCE, 2);
1081 rc = ns->ns_lvbo->lvbo_init(res);
1083 CERROR("lvbo_init failed for resource "
1084 LPU64": rc %d\n", name->name[0], rc);
1085 /* we create resource with locked lr_lvb_sem */
1086 cfs_up(&res->lr_lvb_sem);
1092 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res)
1094 LASSERT(res != NULL);
1095 LASSERT(res != LP_POISON);
1096 cfs_atomic_inc(&res->lr_refcount);
1097 CDEBUG(D_INFO, "getref res: %p count: %d\n", res,
1098 cfs_atomic_read(&res->lr_refcount));
1102 static void __ldlm_resource_putref_final(cfs_hash_bd_t *bd,
1103 struct ldlm_resource *res)
1105 struct ldlm_ns_bucket *nsb = res->lr_ns_bucket;
1107 if (!cfs_list_empty(&res->lr_granted)) {
1108 ldlm_resource_dump(D_ERROR, res);
1112 if (!cfs_list_empty(&res->lr_converting)) {
1113 ldlm_resource_dump(D_ERROR, res);
1117 if (!cfs_list_empty(&res->lr_waiting)) {
1118 ldlm_resource_dump(D_ERROR, res);
1122 cfs_hash_bd_del_locked(nsb->nsb_namespace->ns_rs_hash,
1124 lu_ref_fini(&res->lr_reference);
1125 if (cfs_hash_bd_count_get(bd) == 0)
1126 ldlm_namespace_put(nsb->nsb_namespace);
1129 /* Returns 1 if the resource was freed, 0 if it remains. */
1130 int ldlm_resource_putref(struct ldlm_resource *res)
1132 struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1135 LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
1136 CDEBUG(D_INFO, "putref res: %p count: %d\n",
1137 res, cfs_atomic_read(&res->lr_refcount) - 1);
1139 cfs_hash_bd_get(ns->ns_rs_hash, &res->lr_name, &bd);
1140 if (cfs_hash_bd_dec_and_lock(ns->ns_rs_hash, &bd, &res->lr_refcount)) {
1141 __ldlm_resource_putref_final(&bd, res);
1142 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1143 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
1144 ns->ns_lvbo->lvbo_free(res);
1145 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1151 /* Returns 1 if the resource was freed, 0 if it remains. */
1152 int ldlm_resource_putref_locked(struct ldlm_resource *res)
1154 struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1156 LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
1157 CDEBUG(D_INFO, "putref res: %p count: %d\n",
1158 res, cfs_atomic_read(&res->lr_refcount) - 1);
1160 if (cfs_atomic_dec_and_test(&res->lr_refcount)) {
1163 cfs_hash_bd_get(ldlm_res_to_ns(res)->ns_rs_hash,
1164 &res->lr_name, &bd);
1165 __ldlm_resource_putref_final(&bd, res);
1166 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1167 /* NB: ns_rs_hash is created with CFS_HASH_NO_ITEMREF,
1168 * so we should never be here while calling cfs_hash_del,
1169 * cfs_hash_for_each_nolock is the only case we can get
1170 * here, which is safe to release cfs_hash_bd_lock.
1172 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
1173 ns->ns_lvbo->lvbo_free(res);
1174 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1176 cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
1182 void ldlm_resource_add_lock(struct ldlm_resource *res, cfs_list_t *head,
1183 struct ldlm_lock *lock)
1185 check_res_locked(res);
1187 ldlm_resource_dump(D_INFO, res);
1188 CDEBUG(D_OTHER, "About to add this lock:\n");
1189 ldlm_lock_dump(D_OTHER, lock, 0);
1191 if (lock->l_destroyed) {
1192 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1196 LASSERT(cfs_list_empty(&lock->l_res_link));
1198 cfs_list_add_tail(&lock->l_res_link, head);
1201 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
1202 struct ldlm_lock *new)
1204 struct ldlm_resource *res = original->l_resource;
1206 check_res_locked(res);
1208 ldlm_resource_dump(D_INFO, res);
1209 CDEBUG(D_OTHER, "About to insert this lock after %p:\n", original);
1210 ldlm_lock_dump(D_OTHER, new, 0);
1212 if (new->l_destroyed) {
1213 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1217 LASSERT(cfs_list_empty(&new->l_res_link));
1219 cfs_list_add(&new->l_res_link, &original->l_res_link);
1223 void ldlm_resource_unlink_lock(struct ldlm_lock *lock)
1225 int type = lock->l_resource->lr_type;
1227 check_res_locked(lock->l_resource);
1228 if (type == LDLM_IBITS || type == LDLM_PLAIN)
1229 ldlm_unlink_lock_skiplist(lock);
1230 else if (type == LDLM_EXTENT)
1231 ldlm_extent_unlink_lock(lock);
1232 cfs_list_del_init(&lock->l_res_link);
1235 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc)
1237 desc->lr_type = res->lr_type;
1238 desc->lr_name = res->lr_name;
1241 void ldlm_dump_all_namespaces(ldlm_side_t client, int level)
1245 if (!((libcfs_debug | D_ERROR) & level))
1248 cfs_mutex_down(ldlm_namespace_lock(client));
1250 cfs_list_for_each(tmp, ldlm_namespace_list(client)) {
1251 struct ldlm_namespace *ns;
1252 ns = cfs_list_entry(tmp, struct ldlm_namespace, ns_list_chain);
1253 ldlm_namespace_dump(level, ns);
1256 cfs_mutex_up(ldlm_namespace_lock(client));
1259 static int ldlm_res_hash_dump(cfs_hash_t *hs, cfs_hash_bd_t *bd,
1260 cfs_hlist_node_t *hnode, void *arg)
1262 struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1263 int level = (int)(unsigned long)arg;
1266 ldlm_resource_dump(level, res);
1272 void ldlm_namespace_dump(int level, struct ldlm_namespace *ns)
1274 if (!((libcfs_debug | D_ERROR) & level))
1277 CDEBUG(level, "--- Namespace: %s (rc: %d, side: %s)\n",
1278 ldlm_ns_name(ns), cfs_atomic_read(&ns->ns_bref),
1279 ns_is_client(ns) ? "client" : "server");
1281 if (cfs_time_before(cfs_time_current(), ns->ns_next_dump))
1284 cfs_hash_for_each_nolock(ns->ns_rs_hash,
1286 (void *)(unsigned long)level);
1287 cfs_spin_lock(&ns->ns_lock);
1288 ns->ns_next_dump = cfs_time_shift(10);
1289 cfs_spin_unlock(&ns->ns_lock);
1292 void ldlm_resource_dump(int level, struct ldlm_resource *res)
1297 CLASSERT(RES_NAME_SIZE == 4);
1299 if (!((libcfs_debug | D_ERROR) & level))
1302 CDEBUG(level, "--- Resource: %p ("LPU64"/"LPU64"/"LPU64"/"LPU64
1303 ") (rc: %d)\n", res, res->lr_name.name[0], res->lr_name.name[1],
1304 res->lr_name.name[2], res->lr_name.name[3],
1305 cfs_atomic_read(&res->lr_refcount));
1307 if (!cfs_list_empty(&res->lr_granted)) {
1309 CDEBUG(level, "Granted locks:\n");
1310 cfs_list_for_each(tmp, &res->lr_granted) {
1311 struct ldlm_lock *lock;
1312 lock = cfs_list_entry(tmp, struct ldlm_lock,
1314 ldlm_lock_dump(level, lock, ++pos);
1317 if (!cfs_list_empty(&res->lr_converting)) {
1319 CDEBUG(level, "Converting locks:\n");
1320 cfs_list_for_each(tmp, &res->lr_converting) {
1321 struct ldlm_lock *lock;
1322 lock = cfs_list_entry(tmp, struct ldlm_lock,
1324 ldlm_lock_dump(level, lock, ++pos);
1327 if (!cfs_list_empty(&res->lr_waiting)) {
1329 CDEBUG(level, "Waiting locks:\n");
1330 cfs_list_for_each(tmp, &res->lr_waiting) {
1331 struct ldlm_lock *lock;
1332 lock = cfs_list_entry(tmp, struct ldlm_lock,
1334 ldlm_lock_dump(level, lock, ++pos);