lustre/ldlm/ldlm_resource.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   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.
  11  *
  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).
  17  *
  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
  21  *
  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
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/ldlm/ldlm_resource.c
  37  *
  38  * Author: Phil Schwan <phil@clusterfs.com>
  39  * Author: Peter Braam <braam@clusterfs.com>
  40  */
  41
  42 #define DEBUG_SUBSYSTEM S_LDLM
  43 #ifdef __KERNEL__
  44 # include <lustre_dlm.h>
  45 #else
  46 # include <liblustre.h>
  47 #endif
  48
  49 #include <obd_class.h>
  50 #include "ldlm_internal.h"
  51
  52 cfs_mem_cache_t *ldlm_resource_slab, *ldlm_lock_slab;
  53
  54 cfs_atomic_t ldlm_srv_namespace_nr = CFS_ATOMIC_INIT(0);
  55 cfs_atomic_t ldlm_cli_namespace_nr = CFS_ATOMIC_INIT(0);
  56
  57 cfs_semaphore_t ldlm_srv_namespace_lock;
  58 CFS_LIST_HEAD(ldlm_srv_namespace_list);
  59
  60 cfs_semaphore_t ldlm_cli_namespace_lock;
  61 CFS_LIST_HEAD(ldlm_cli_namespace_list);
  62
  63 cfs_proc_dir_entry_t *ldlm_type_proc_dir = NULL;
  64 cfs_proc_dir_entry_t *ldlm_ns_proc_dir = NULL;
  65 cfs_proc_dir_entry_t *ldlm_svc_proc_dir = NULL;
  66
  67 #ifdef LPROCFS
  68 static int ldlm_proc_dump_ns(struct file *file, const char *buffer,
  69                              unsigned long count, void *data)
  70 {
  71         ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
  72         ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
  73         RETURN(count);
  74 }
  75
  76 int ldlm_proc_setup(void)
  77 {
  78         int rc;
  79         struct lprocfs_vars list[] = {
  80                 { "dump_namespaces", NULL, ldlm_proc_dump_ns, NULL },
  81                 { NULL }};
  82         ENTRY;
  83         LASSERT(ldlm_ns_proc_dir == NULL);
  84
  85         ldlm_type_proc_dir = lprocfs_register(OBD_LDLM_DEVICENAME,
  86                                               proc_lustre_root,
  87                                               NULL, NULL);
  88         if (IS_ERR(ldlm_type_proc_dir)) {
  89                 CERROR("LProcFS failed in ldlm-init\n");
  90                 rc = PTR_ERR(ldlm_type_proc_dir);
  91                 GOTO(err, rc);
  92         }
  93
  94         ldlm_ns_proc_dir = lprocfs_register("namespaces",
  95                                             ldlm_type_proc_dir,
  96                                             NULL, NULL);
  97         if (IS_ERR(ldlm_ns_proc_dir)) {
  98                 CERROR("LProcFS failed in ldlm-init\n");
  99                 rc = PTR_ERR(ldlm_ns_proc_dir);
 100                 GOTO(err_type, rc);
 101         }
 102
 103         ldlm_svc_proc_dir = lprocfs_register("services",
 104                                             ldlm_type_proc_dir,
 105                                             NULL, NULL);
 106         if (IS_ERR(ldlm_svc_proc_dir)) {
 107                 CERROR("LProcFS failed in ldlm-init\n");
 108                 rc = PTR_ERR(ldlm_svc_proc_dir);
 109                 GOTO(err_ns, rc);
 110         }
 111
 112         rc = lprocfs_add_vars(ldlm_type_proc_dir, list, NULL);
 113
 114         RETURN(0);
 115
 116 err_ns:
 117         lprocfs_remove(&ldlm_ns_proc_dir);
 118 err_type:
 119         lprocfs_remove(&ldlm_type_proc_dir);
 120 err:
 121         ldlm_svc_proc_dir = NULL;
 122         RETURN(rc);
 123 }
 124
 125 void ldlm_proc_cleanup(void)
 126 {
 127         if (ldlm_svc_proc_dir)
 128                 lprocfs_remove(&ldlm_svc_proc_dir);
 129
 130         if (ldlm_ns_proc_dir)
 131                 lprocfs_remove(&ldlm_ns_proc_dir);
 132
 133         if (ldlm_type_proc_dir)
 134                 lprocfs_remove(&ldlm_type_proc_dir);
 135 }
 136
 137 static int lprocfs_rd_lru_size(char *page, char **start, off_t off,
 138                                int count, int *eof, void *data)
 139 {
 140         struct ldlm_namespace *ns = data;
 141         __u32 *nr = &ns->ns_max_unused;
 142
 143         if (ns_connect_lru_resize(ns))
 144                 nr = &ns->ns_nr_unused;
 145         return lprocfs_rd_uint(page, start, off, count, eof, nr);
 146 }
 147
 148 static int lprocfs_wr_lru_size(struct file *file, const char *buffer,
 149                                unsigned long count, void *data)
 150 {
 151         struct ldlm_namespace *ns = data;
 152         char dummy[MAX_STRING_SIZE + 1], *end;
 153         unsigned long tmp;
 154         int lru_resize;
 155
 156         dummy[MAX_STRING_SIZE] = '\0';
 157         if (cfs_copy_from_user(dummy, buffer, MAX_STRING_SIZE))
 158                 return -EFAULT;
 159
 160         if (strncmp(dummy, "clear", 5) == 0) {
 161                 CDEBUG(D_DLMTRACE,
 162                        "dropping all unused locks from namespace %s\n",
 163                        ns->ns_name);
 164                 if (ns_connect_lru_resize(ns)) {
 165                         int canceled, unused  = ns->ns_nr_unused;
 166
 167                         /* Try to cancel all @ns_nr_unused locks. */
 168                         canceled = ldlm_cancel_lru(ns, unused, LDLM_SYNC,
 169                                                    LDLM_CANCEL_PASSED);
 170                         if (canceled < unused) {
 171                                 CERROR("not all requested locks are canceled, "
 172                                        "requested: %d, canceled: %d\n", unused,
 173                                        canceled);
 174                                 return -EINVAL;
 175                         }
 176                 } else {
 177                         tmp = ns->ns_max_unused;
 178                         ns->ns_max_unused = 0;
 179                         ldlm_cancel_lru(ns, 0, LDLM_SYNC, LDLM_CANCEL_PASSED);
 180                         ns->ns_max_unused = tmp;
 181                 }
 182                 return count;
 183         }
 184
 185         tmp = simple_strtoul(dummy, &end, 0);
 186         if (dummy == end) {
 187                 CERROR("invalid value written\n");
 188                 return -EINVAL;
 189         }
 190         lru_resize = (tmp == 0);
 191
 192         if (ns_connect_lru_resize(ns)) {
 193                 if (!lru_resize)
 194                         ns->ns_max_unused = (unsigned int)tmp;
 195
 196                 if (tmp > ns->ns_nr_unused)
 197                         tmp = ns->ns_nr_unused;
 198                 tmp = ns->ns_nr_unused - tmp;
 199
 200                 CDEBUG(D_DLMTRACE,
 201                        "changing namespace %s unused locks from %u to %u\n",
 202                        ns->ns_name, ns->ns_nr_unused, (unsigned int)tmp);
 203                 ldlm_cancel_lru(ns, tmp, LDLM_ASYNC, LDLM_CANCEL_PASSED);
 204
 205                 if (!lru_resize) {
 206                         CDEBUG(D_DLMTRACE,
 207                                "disable lru_resize for namespace %s\n",
 208                                ns->ns_name);
 209                         ns->ns_connect_flags &= ~OBD_CONNECT_LRU_RESIZE;
 210                 }
 211         } else {
 212                 CDEBUG(D_DLMTRACE,
 213                        "changing namespace %s max_unused from %u to %u\n",
 214                        ns->ns_name, ns->ns_max_unused, (unsigned int)tmp);
 215                 ns->ns_max_unused = (unsigned int)tmp;
 216                 ldlm_cancel_lru(ns, 0, LDLM_ASYNC, LDLM_CANCEL_PASSED);
 217
 218                 /* Make sure that originally lru resize was supported before
 219                  * turning it on here. */
 220                 if (lru_resize &&
 221                     (ns->ns_orig_connect_flags & OBD_CONNECT_LRU_RESIZE)) {
 222                         CDEBUG(D_DLMTRACE,
 223                                "enable lru_resize for namespace %s\n",
 224                                ns->ns_name);
 225                         ns->ns_connect_flags |= OBD_CONNECT_LRU_RESIZE;
 226                 }
 227         }
 228
 229         return count;
 230 }
 231
 232 void ldlm_proc_namespace(struct ldlm_namespace *ns)
 233 {
 234         struct lprocfs_vars lock_vars[2];
 235         char lock_name[MAX_STRING_SIZE + 1];
 236
 237         LASSERT(ns != NULL);
 238         LASSERT(ns->ns_name != NULL);
 239
 240         lock_name[MAX_STRING_SIZE] = '\0';
 241
 242         memset(lock_vars, 0, sizeof(lock_vars));
 243         lock_vars[0].name = lock_name;
 244
 245         snprintf(lock_name, MAX_STRING_SIZE, "%s/resource_count", ns->ns_name);
 246         lock_vars[0].data = &ns->ns_refcount;
 247         lock_vars[0].read_fptr = lprocfs_rd_atomic;
 248         lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 249
 250         snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_count", ns->ns_name);
 251         lock_vars[0].data = &ns->ns_locks;
 252         lock_vars[0].read_fptr = lprocfs_rd_atomic;
 253         lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 254
 255         if (ns_is_client(ns)) {
 256                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_unused_count",
 257                          ns->ns_name);
 258                 lock_vars[0].data = &ns->ns_nr_unused;
 259                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 260                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 261
 262                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lru_size",
 263                          ns->ns_name);
 264                 lock_vars[0].data = ns;
 265                 lock_vars[0].read_fptr = lprocfs_rd_lru_size;
 266                 lock_vars[0].write_fptr = lprocfs_wr_lru_size;
 267                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 268
 269                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lru_max_age",
 270                          ns->ns_name);
 271                 lock_vars[0].data = &ns->ns_max_age;
 272                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 273                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 274                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 275         } else {
 276                 snprintf(lock_name, MAX_STRING_SIZE, "%s/ctime_age_limit",
 277                          ns->ns_name);
 278                 lock_vars[0].data = &ns->ns_ctime_age_limit;
 279                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 280                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 281                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 282
 283                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_timeouts",
 284                          ns->ns_name);
 285                 lock_vars[0].data = &ns->ns_timeouts;
 286                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 287                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 288
 289                 snprintf(lock_name, MAX_STRING_SIZE, "%s/max_nolock_bytes",
 290                          ns->ns_name);
 291                 lock_vars[0].data = &ns->ns_max_nolock_size;
 292                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 293                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 294                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 295
 296                 snprintf(lock_name, MAX_STRING_SIZE, "%s/contention_seconds",
 297                          ns->ns_name);
 298                 lock_vars[0].data = &ns->ns_contention_time;
 299                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 300                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 301                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 302
 303                 snprintf(lock_name, MAX_STRING_SIZE, "%s/contended_locks",
 304                          ns->ns_name);
 305                 lock_vars[0].data = &ns->ns_contended_locks;
 306                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 307                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 308                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 309         }
 310 }
 311 #undef MAX_STRING_SIZE
 312 #else
 313 #define ldlm_proc_namespace(ns) do {} while (0)
 314 #endif /* LPROCFS */
 315
 316 struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
 317                                           ldlm_side_t client, ldlm_appetite_t apt)
 318 {
 319         struct ldlm_namespace *ns = NULL;
 320         cfs_list_t *bucket;
 321         int rc, idx, namelen;
 322         ENTRY;
 323
 324         rc = ldlm_get_ref();
 325         if (rc) {
 326                 CERROR("ldlm_get_ref failed: %d\n", rc);
 327                 RETURN(NULL);
 328         }
 329
 330         OBD_ALLOC_PTR(ns);
 331         if (!ns)
 332                 GOTO(out_ref, NULL);
 333
 334         OBD_VMALLOC(ns->ns_hash, sizeof(*ns->ns_hash) * RES_HASH_SIZE);
 335         if (!ns->ns_hash)
 336                 GOTO(out_ns, NULL);
 337
 338         ns->ns_appetite = apt;
 339
 340         LASSERT(obd != NULL);
 341         ns->ns_obd = obd;
 342
 343         namelen = strlen(name);
 344         OBD_ALLOC(ns->ns_name, namelen + 1);
 345         if (!ns->ns_name)
 346                 GOTO(out_hash, NULL);
 347
 348         strcpy(ns->ns_name, name);
 349
 350         CFS_INIT_LIST_HEAD(&ns->ns_root_list);
 351         CFS_INIT_LIST_HEAD(&ns->ns_list_chain);
 352         ns->ns_refcount = 0;
 353         ns->ns_client = client;
 354         cfs_spin_lock_init(&ns->ns_hash_lock);
 355         cfs_atomic_set(&ns->ns_locks, 0);
 356         ns->ns_resources = 0;
 357         cfs_waitq_init(&ns->ns_waitq);
 358         ns->ns_max_nolock_size = NS_DEFAULT_MAX_NOLOCK_BYTES;
 359         ns->ns_contention_time = NS_DEFAULT_CONTENTION_SECONDS;
 360         ns->ns_contended_locks = NS_DEFAULT_CONTENDED_LOCKS;
 361
 362         for (bucket = ns->ns_hash + RES_HASH_SIZE - 1; bucket >= ns->ns_hash;
 363              bucket--)
 364                 CFS_INIT_LIST_HEAD(bucket);
 365
 366         CFS_INIT_LIST_HEAD(&ns->ns_unused_list);
 367         ns->ns_nr_unused = 0;
 368         ns->ns_max_unused = LDLM_DEFAULT_LRU_SIZE;
 369         ns->ns_max_age = LDLM_DEFAULT_MAX_ALIVE;
 370         ns->ns_ctime_age_limit = LDLM_CTIME_AGE_LIMIT;
 371         ns->ns_timeouts = 0;
 372         cfs_spin_lock_init(&ns->ns_unused_lock);
 373         ns->ns_orig_connect_flags = 0;
 374         ns->ns_connect_flags = 0;
 375         ldlm_proc_namespace(ns);
 376
 377         idx = cfs_atomic_read(ldlm_namespace_nr(client));
 378         rc = ldlm_pool_init(&ns->ns_pool, ns, idx, client);
 379         if (rc) {
 380                 CERROR("Can't initialize lock pool, rc %d\n", rc);
 381                 GOTO(out_proc, rc);
 382         }
 383
 384         at_init(&ns->ns_at_estimate, ldlm_enqueue_min, 0);
 385
 386         ldlm_namespace_register(ns, client);
 387         RETURN(ns);
 388 out_proc:
 389         ldlm_namespace_cleanup(ns, 0);
 390         OBD_FREE(ns->ns_name, namelen + 1);
 391 out_hash:
 392         OBD_VFREE(ns->ns_hash, sizeof(*ns->ns_hash) * RES_HASH_SIZE);
 393 out_ns:
 394         OBD_FREE_PTR(ns);
 395 out_ref:
 396         ldlm_put_ref();
 397         RETURN(NULL);
 398 }
 399
 400 extern struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
 401
 402 /* If flags contains FL_LOCAL_ONLY, don't try to tell the server, just cleanup.
 403  * This is currently only used for recovery, and we make certain assumptions
 404  * as a result--notably, that we shouldn't cancel locks with refs. -phil
 405  *
 406  * Called with the ns_lock held. */
 407 static void cleanup_resource(struct ldlm_resource *res, cfs_list_t *q,
 408                              int flags)
 409 {
 410         cfs_list_t *tmp;
 411         int rc = 0, client = ns_is_client(res->lr_namespace);
 412         int local_only = (flags & LDLM_FL_LOCAL_ONLY);
 413         ENTRY;
 414
 415
 416         do {
 417                 struct ldlm_lock *lock = NULL;
 418
 419                 /* first, we look for non-cleaned-yet lock
 420                  * all cleaned locks are marked by CLEANED flag */
 421                 lock_res(res);
 422                 cfs_list_for_each(tmp, q) {
 423                         lock = cfs_list_entry(tmp, struct ldlm_lock,
 424                                               l_res_link);
 425                         if (lock->l_flags & LDLM_FL_CLEANED) {
 426                                 lock = NULL;
 427                                 continue;
 428                         }
 429                         LDLM_LOCK_GET(lock);
 430                         lock->l_flags |= LDLM_FL_CLEANED;
 431                         break;
 432                 }
 433
 434                 if (lock == NULL) {
 435                         unlock_res(res);
 436                         break;
 437                 }
 438
 439                 /* Set CBPENDING so nothing in the cancellation path
 440                  * can match this lock */
 441                 lock->l_flags |= LDLM_FL_CBPENDING;
 442                 lock->l_flags |= LDLM_FL_FAILED;
 443                 lock->l_flags |= flags;
 444
 445                 /* ... without sending a CANCEL message for local_only. */
 446                 if (local_only)
 447                         lock->l_flags |= LDLM_FL_LOCAL_ONLY;
 448
 449                 if (local_only && (lock->l_readers || lock->l_writers)) {
 450                         /* This is a little bit gross, but much better than the
 451                          * alternative: pretend that we got a blocking AST from
 452                          * the server, so that when the lock is decref'd, it
 453                          * will go away ... */
 454                         unlock_res(res);
 455                         LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
 456                         if (lock->l_completion_ast)
 457                                 lock->l_completion_ast(lock, 0, NULL);
 458                         LDLM_LOCK_RELEASE(lock);
 459                         continue;
 460                 }
 461
 462                 if (client) {
 463                         struct lustre_handle lockh;
 464
 465                         unlock_res(res);
 466                         ldlm_lock2handle(lock, &lockh);
 467                         rc = ldlm_cli_cancel(&lockh);
 468                         if (rc)
 469                                 CERROR("ldlm_cli_cancel: %d\n", rc);
 470                 } else {
 471                         ldlm_resource_unlink_lock(lock);
 472                         unlock_res(res);
 473                         LDLM_DEBUG(lock, "Freeing a lock still held by a "
 474                                    "client node");
 475                         ldlm_lock_destroy(lock);
 476                 }
 477                 LDLM_LOCK_RELEASE(lock);
 478         } while (1);
 479
 480         EXIT;
 481 }
 482
 483 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, int flags)
 484 {
 485         cfs_list_t *tmp;
 486         int i;
 487
 488         if (ns == NULL) {
 489                 CDEBUG(D_INFO, "NULL ns, skipping cleanup\n");
 490                 return ELDLM_OK;
 491         }
 492
 493         for (i = 0; i < RES_HASH_SIZE; i++) {
 494                 cfs_spin_lock(&ns->ns_hash_lock);
 495                 tmp = ns->ns_hash[i].next;
 496                 while (tmp != &(ns->ns_hash[i])) {
 497                         struct ldlm_resource *res;
 498                         res = cfs_list_entry(tmp, struct ldlm_resource,
 499                                              lr_hash);
 500                         ldlm_resource_getref(res);
 501                         cfs_spin_unlock(&ns->ns_hash_lock);
 502                         LDLM_RESOURCE_ADDREF(res);
 503
 504                         cleanup_resource(res, &res->lr_granted, flags);
 505                         cleanup_resource(res, &res->lr_converting, flags);
 506                         cleanup_resource(res, &res->lr_waiting, flags);
 507
 508                         cfs_spin_lock(&ns->ns_hash_lock);
 509                         tmp = tmp->next;
 510
 511                         /* XXX: former stuff caused issues in case of race
 512                          * between ldlm_namespace_cleanup() and lockd() when
 513                          * client gets blocking ast when lock gets distracted by
 514                          * server. This is 1_4 branch solution, let's see how
 515                          * will it behave. */
 516                         LDLM_RESOURCE_DELREF(res);
 517                         if (!ldlm_resource_putref_locked(res)) {
 518                                 CERROR("Namespace %s resource refcount nonzero "
 519                                        "(%d) after lock cleanup; forcing "
 520                                        "cleanup.\n",
 521                                        ns->ns_name,
 522                                        cfs_atomic_read(&res->lr_refcount));
 523                                 CERROR("Resource: %p ("LPU64"/"LPU64"/"LPU64"/"
 524                                        LPU64") (rc: %d)\n", res,
 525                                        res->lr_name.name[0],
 526                                        res->lr_name.name[1],
 527                                        res->lr_name.name[2],
 528                                        res->lr_name.name[3],
 529                                        cfs_atomic_read(&res->lr_refcount));
 530                         }
 531                 }
 532                 cfs_spin_unlock(&ns->ns_hash_lock);
 533         }
 534
 535         return ELDLM_OK;
 536 }
 537
 538 static int __ldlm_namespace_free(struct ldlm_namespace *ns, int force)
 539 {
 540         ENTRY;
 541
 542         /* At shutdown time, don't call the cancellation callback */
 543         ldlm_namespace_cleanup(ns, force ? LDLM_FL_LOCAL_ONLY : 0);
 544
 545         if (ns->ns_refcount > 0) {
 546                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 547                 int rc;
 548                 CDEBUG(D_DLMTRACE,
 549                        "dlm namespace %s free waiting on refcount %d\n",
 550                        ns->ns_name, ns->ns_refcount);
 551 force_wait:
 552                 if (force)
 553                         lwi = LWI_TIMEOUT(obd_timeout * CFS_HZ / 4, NULL, NULL);
 554
 555                 rc = l_wait_event(ns->ns_waitq,
 556                                   ns->ns_refcount == 0, &lwi);
 557
 558                 /* Forced cleanups should be able to reclaim all references,
 559                  * so it's safe to wait forever... we can't leak locks... */
 560                 if (force && rc == -ETIMEDOUT) {
 561                         LCONSOLE_ERROR("Forced cleanup waiting for %s "
 562                                        "namespace with %d resources in use, "
 563                                        "(rc=%d)\n", ns->ns_name,
 564                                        ns->ns_refcount, rc);
 565                         GOTO(force_wait, rc);
 566                 }
 567
 568                 if (ns->ns_refcount) {
 569                         LCONSOLE_ERROR("Cleanup waiting for %s namespace "
 570                                        "with %d resources in use, (rc=%d)\n",
 571                                        ns->ns_name,
 572                                        ns->ns_refcount, rc);
 573                         RETURN(ELDLM_NAMESPACE_EXISTS);
 574                 }
 575                 CDEBUG(D_DLMTRACE,
 576                        "dlm namespace %s free done waiting\n", ns->ns_name);
 577         }
 578
 579         RETURN(ELDLM_OK);
 580 }
 581
 582 /**
 583  * Performs various cleanups for passed \a ns to make it drop refc and be ready
 584  * for freeing. Waits for refc == 0.
 585  *
 586  * The following is done:
 587  * (0) Unregister \a ns from its list to make inaccessible for potential users
 588  * like pools thread and others;
 589  * (1) Clear all locks in \a ns.
 590  */
 591 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
 592                                struct obd_import *imp,
 593                                int force)
 594 {
 595         int rc;
 596         ENTRY;
 597         if (!ns) {
 598                 EXIT;
 599                 return;
 600         }
 601
 602
 603         /*
 604          * Can fail with -EINTR when force == 0 in which case try harder.
 605          */
 606         rc = __ldlm_namespace_free(ns, force);
 607         if (rc != ELDLM_OK) {
 608                 if (imp) {
 609                         ptlrpc_disconnect_import(imp, 0);
 610                         ptlrpc_invalidate_import(imp);
 611                 }
 612
 613                 /*
 614                  * With all requests dropped and the import inactive
 615                  * we are gaurenteed all reference will be dropped.
 616                  */
 617                 rc = __ldlm_namespace_free(ns, 1);
 618                 LASSERT(rc == 0);
 619         }
 620         EXIT;
 621 }
 622
 623 /**
 624  * Performs freeing memory structures related to \a ns. This is only done when
 625  * ldlm_namespce_free_prior() successfully removed all resources referencing
 626  * \a ns and its refc == 0.
 627  */
 628 void ldlm_namespace_free_post(struct ldlm_namespace *ns)
 629 {
 630         ENTRY;
 631         if (!ns) {
 632                 EXIT;
 633                 return;
 634         }
 635
 636
 637         /*
 638          * Make sure that nobody can find this ns in its list.
 639          */
 640         ldlm_namespace_unregister(ns, ns->ns_client);
 641         /*
 642          * Fini pool _before_ parent proc dir is removed. This is important as
 643          * ldlm_pool_fini() removes own proc dir which is child to @dir. Removing
 644          * it after @dir may cause oops.
 645          */
 646         ldlm_pool_fini(&ns->ns_pool);
 647
 648 #ifdef LPROCFS
 649         {
 650                 struct proc_dir_entry *dir;
 651                 dir = lprocfs_srch(ldlm_ns_proc_dir, ns->ns_name);
 652                 if (dir == NULL) {
 653                         CERROR("dlm namespace %s has no procfs dir?\n",
 654                                ns->ns_name);
 655                 } else {
 656                         lprocfs_remove(&dir);
 657                 }
 658         }
 659 #endif
 660
 661         OBD_VFREE(ns->ns_hash, sizeof(*ns->ns_hash) * RES_HASH_SIZE);
 662         OBD_FREE(ns->ns_name, strlen(ns->ns_name) + 1);
 663
 664         /*
 665          * Namespace \a ns should be not on list in this time, otherwise this
 666          * will cause issues realted to using freed \a ns in pools thread.
 667          */
 668         LASSERT(cfs_list_empty(&ns->ns_list_chain));
 669         OBD_FREE_PTR(ns);
 670         ldlm_put_ref();
 671         EXIT;
 672 }
 673
 674
 675 /* Cleanup the resource, and free namespace.
 676  * bug 12864:
 677  * Deadlock issue:
 678  * proc1: destroy import
 679  *        class_disconnect_export(grab cl_sem) ->
 680  *              -> ldlm_namespace_free ->
 681  *              -> lprocfs_remove(grab _lprocfs_lock).
 682  * proc2: read proc info
 683  *        lprocfs_fops_read(grab _lprocfs_lock) ->
 684  *              -> osc_rd_active, etc(grab cl_sem).
 685  *
 686  * So that I have to split the ldlm_namespace_free into two parts - the first
 687  * part ldlm_namespace_free_prior is used to cleanup the resource which is
 688  * being used; the 2nd part ldlm_namespace_free_post is used to unregister the
 689  * lprocfs entries, and then free memory. It will be called w/o cli->cl_sem
 690  * held.
 691  */
 692 void ldlm_namespace_free(struct ldlm_namespace *ns,
 693                          struct obd_import *imp,
 694                          int force)
 695 {
 696         ldlm_namespace_free_prior(ns, imp, force);
 697         ldlm_namespace_free_post(ns);
 698 }
 699
 700
 701 void ldlm_namespace_get_locked(struct ldlm_namespace *ns)
 702 {
 703         ns->ns_refcount++;
 704 }
 705
 706 void ldlm_namespace_get(struct ldlm_namespace *ns)
 707 {
 708         cfs_spin_lock(&ns->ns_hash_lock);
 709         ldlm_namespace_get_locked(ns);
 710         cfs_spin_unlock(&ns->ns_hash_lock);
 711 }
 712
 713 void ldlm_namespace_put_locked(struct ldlm_namespace *ns, int wakeup)
 714 {
 715         LASSERT(ns->ns_refcount > 0);
 716         ns->ns_refcount--;
 717         if (ns->ns_refcount == 0 && wakeup)
 718                 cfs_waitq_signal(&ns->ns_waitq);
 719 }
 720
 721 void ldlm_namespace_put(struct ldlm_namespace *ns, int wakeup)
 722 {
 723         cfs_spin_lock(&ns->ns_hash_lock);
 724         ldlm_namespace_put_locked(ns, wakeup);
 725         cfs_spin_unlock(&ns->ns_hash_lock);
 726 }
 727
 728 /* Register @ns in the list of namespaces */
 729 void ldlm_namespace_register(struct ldlm_namespace *ns, ldlm_side_t client)
 730 {
 731         cfs_mutex_down(ldlm_namespace_lock(client));
 732         LASSERT(cfs_list_empty(&ns->ns_list_chain));
 733         cfs_list_add(&ns->ns_list_chain, ldlm_namespace_list(client));
 734         cfs_atomic_inc(ldlm_namespace_nr(client));
 735         cfs_mutex_up(ldlm_namespace_lock(client));
 736 }
 737
 738 /* Unregister @ns from the list of namespaces */
 739 void ldlm_namespace_unregister(struct ldlm_namespace *ns, ldlm_side_t client)
 740 {
 741         cfs_mutex_down(ldlm_namespace_lock(client));
 742         LASSERT(!cfs_list_empty(&ns->ns_list_chain));
 743         /*
 744          * Some asserts and possibly other parts of code still using
 745          * list_empty(&ns->ns_list_chain). This is why it is important
 746          * to use list_del_init() here.
 747          */
 748         cfs_list_del_init(&ns->ns_list_chain);
 749         cfs_atomic_dec(ldlm_namespace_nr(client));
 750         cfs_mutex_up(ldlm_namespace_lock(client));
 751 }
 752
 753 /* Should be called under ldlm_namespace_lock(client) taken */
 754 void ldlm_namespace_move_locked(struct ldlm_namespace *ns, ldlm_side_t client)
 755 {
 756         LASSERT(!cfs_list_empty(&ns->ns_list_chain));
 757         LASSERT_SEM_LOCKED(ldlm_namespace_lock(client));
 758         cfs_list_move_tail(&ns->ns_list_chain, ldlm_namespace_list(client));
 759 }
 760
 761 /* Should be called under ldlm_namespace_lock(client) taken */
 762 struct ldlm_namespace *ldlm_namespace_first_locked(ldlm_side_t client)
 763 {
 764         LASSERT_SEM_LOCKED(ldlm_namespace_lock(client));
 765         LASSERT(!cfs_list_empty(ldlm_namespace_list(client)));
 766         return container_of(ldlm_namespace_list(client)->next,
 767                 struct ldlm_namespace, ns_list_chain);
 768 }
 769 static __u32 ldlm_hash_fn(struct ldlm_resource *parent,
 770                           const struct ldlm_res_id *name)
 771 {
 772         __u32 hash = 0;
 773         int i;
 774
 775         for (i = 0; i < RES_NAME_SIZE; i++)
 776                 hash += name->name[i];
 777
 778         hash += (__u32)((unsigned long)parent >> 4);
 779
 780         return (hash & RES_HASH_MASK);
 781 }
 782
 783 static struct ldlm_resource *ldlm_resource_new(void)
 784 {
 785         struct ldlm_resource *res;
 786         int idx;
 787
 788         OBD_SLAB_ALLOC_PTR_GFP(res, ldlm_resource_slab, CFS_ALLOC_IO);
 789         if (res == NULL)
 790                 return NULL;
 791
 792         memset(res, 0, sizeof(*res));
 793
 794         CFS_INIT_LIST_HEAD(&res->lr_children);
 795         CFS_INIT_LIST_HEAD(&res->lr_childof);
 796         CFS_INIT_LIST_HEAD(&res->lr_granted);
 797         CFS_INIT_LIST_HEAD(&res->lr_converting);
 798         CFS_INIT_LIST_HEAD(&res->lr_waiting);
 799
 800         /* initialize interval trees for each lock mode*/
 801         for (idx = 0; idx < LCK_MODE_NUM; idx++) {
 802                 res->lr_itree[idx].lit_size = 0;
 803                 res->lr_itree[idx].lit_mode = 1 << idx;
 804                 res->lr_itree[idx].lit_root = NULL;
 805         }
 806
 807         cfs_atomic_set(&res->lr_refcount, 1);
 808         cfs_spin_lock_init(&res->lr_lock);
 809         lu_ref_init(&res->lr_reference);
 810
 811         /* one who creates the resource must unlock
 812          * the semaphore after lvb initialization */
 813         cfs_init_mutex_locked(&res->lr_lvb_sem);
 814
 815         return res;
 816 }
 817
 818 /* must be called with hash lock held */
 819 static struct ldlm_resource *
 820 ldlm_resource_find(struct ldlm_namespace *ns, const struct ldlm_res_id *name,
 821                    __u32 hash)
 822 {
 823         cfs_list_t *bucket, *tmp;
 824         struct ldlm_resource *res;
 825
 826         LASSERT_SPIN_LOCKED(&ns->ns_hash_lock);
 827         bucket = ns->ns_hash + hash;
 828
 829         cfs_list_for_each(tmp, bucket) {
 830                 res = cfs_list_entry(tmp, struct ldlm_resource, lr_hash);
 831                 if (memcmp(&res->lr_name, name, sizeof(res->lr_name)) == 0)
 832                         return res;
 833         }
 834
 835         return NULL;
 836 }
 837
 838 /* Args: locked namespace
 839  * Returns: newly-allocated, referenced, unlocked resource */
 840 static struct ldlm_resource *
 841 ldlm_resource_add(struct ldlm_namespace *ns, struct ldlm_resource *parent,
 842                   const struct ldlm_res_id *name, __u32 hash, ldlm_type_t type)
 843 {
 844         cfs_list_t *bucket;
 845         struct ldlm_resource *res, *old_res;
 846         ENTRY;
 847
 848         LASSERTF(type >= LDLM_MIN_TYPE && type < LDLM_MAX_TYPE,
 849                  "type: %d\n", type);
 850
 851         res = ldlm_resource_new();
 852         if (!res)
 853                 RETURN(NULL);
 854
 855         res->lr_name = *name;
 856         res->lr_namespace = ns;
 857         res->lr_type = type;
 858         res->lr_most_restr = LCK_NL;
 859
 860         cfs_spin_lock(&ns->ns_hash_lock);
 861         old_res = ldlm_resource_find(ns, name, hash);
 862         if (old_res) {
 863                 /* someone won the race and added the resource before */
 864                 ldlm_resource_getref(old_res);
 865                 cfs_spin_unlock(&ns->ns_hash_lock);
 866                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
 867                 /* synchronize WRT resource creation */
 868                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
 869                         cfs_down(&old_res->lr_lvb_sem);
 870                         cfs_up(&old_res->lr_lvb_sem);
 871                 }
 872                 RETURN(old_res);
 873         }
 874
 875         /* we won! let's add the resource */
 876         bucket = ns->ns_hash + hash;
 877         cfs_list_add(&res->lr_hash, bucket);
 878         ns->ns_resources++;
 879         ldlm_namespace_get_locked(ns);
 880
 881         if (parent == NULL) {
 882                 cfs_list_add(&res->lr_childof, &ns->ns_root_list);
 883         } else {
 884                 res->lr_parent = parent;
 885                 cfs_list_add(&res->lr_childof, &parent->lr_children);
 886         }
 887         cfs_spin_unlock(&ns->ns_hash_lock);
 888
 889         if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
 890                 int rc;
 891
 892                 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CREATE_RESOURCE, 2);
 893                 rc = ns->ns_lvbo->lvbo_init(res);
 894                 if (rc)
 895                         CERROR("lvbo_init failed for resource "
 896                                LPU64": rc %d\n", name->name[0], rc);
 897                 /* we create resource with locked lr_lvb_sem */
 898                 cfs_up(&res->lr_lvb_sem);
 899         }
 900
 901         RETURN(res);
 902 }
 903
 904 /* Args: unlocked namespace
 905  * Locks: takes and releases ns->ns_lock and res->lr_lock
 906  * Returns: referenced, unlocked ldlm_resource or NULL */
 907 struct ldlm_resource *
 908 ldlm_resource_get(struct ldlm_namespace *ns, struct ldlm_resource *parent,
 909                   const struct ldlm_res_id *name, ldlm_type_t type, int create)
 910 {
 911         __u32 hash = ldlm_hash_fn(parent, name);
 912         struct ldlm_resource *res = NULL;
 913         ENTRY;
 914
 915         LASSERT(ns != NULL);
 916         LASSERT(ns->ns_hash != NULL);
 917         LASSERT(name->name[0] != 0);
 918
 919         cfs_spin_lock(&ns->ns_hash_lock);
 920         res = ldlm_resource_find(ns, name, hash);
 921         if (res) {
 922                 ldlm_resource_getref(res);
 923                 cfs_spin_unlock(&ns->ns_hash_lock);
 924                 /* synchronize WRT resource creation */
 925                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
 926                         cfs_down(&res->lr_lvb_sem);
 927                         cfs_up(&res->lr_lvb_sem);
 928                 }
 929                 RETURN(res);
 930         }
 931         cfs_spin_unlock(&ns->ns_hash_lock);
 932
 933         if (create == 0)
 934                 RETURN(NULL);
 935
 936         res = ldlm_resource_add(ns, parent, name, hash, type);
 937         RETURN(res);
 938 }
 939
 940 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res)
 941 {
 942         LASSERT(res != NULL);
 943         LASSERT(res != LP_POISON);
 944         cfs_atomic_inc(&res->lr_refcount);
 945         CDEBUG(D_INFO, "getref res: %p count: %d\n", res,
 946                cfs_atomic_read(&res->lr_refcount));
 947         return res;
 948 }
 949
 950 void __ldlm_resource_putref_final(struct ldlm_resource *res)
 951 {
 952         struct ldlm_namespace *ns = res->lr_namespace;
 953
 954         LASSERT_SPIN_LOCKED(&ns->ns_hash_lock);
 955
 956         if (!cfs_list_empty(&res->lr_granted)) {
 957                 ldlm_resource_dump(D_ERROR, res);
 958                 LBUG();
 959         }
 960
 961         if (!cfs_list_empty(&res->lr_converting)) {
 962                 ldlm_resource_dump(D_ERROR, res);
 963                 LBUG();
 964         }
 965
 966         if (!cfs_list_empty(&res->lr_waiting)) {
 967                 ldlm_resource_dump(D_ERROR, res);
 968                 LBUG();
 969         }
 970
 971         if (!cfs_list_empty(&res->lr_children)) {
 972                 ldlm_resource_dump(D_ERROR, res);
 973                 LBUG();
 974         }
 975
 976         /* Pass 0 here to not wake ->ns_waitq up yet, we will do it few
 977          * lines below when all children are freed. */
 978         ldlm_namespace_put_locked(ns, 0);
 979         cfs_list_del_init(&res->lr_hash);
 980         cfs_list_del_init(&res->lr_childof);
 981         lu_ref_fini(&res->lr_reference);
 982
 983         ns->ns_resources--;
 984         if (ns->ns_resources == 0)
 985                 cfs_waitq_signal(&ns->ns_waitq);
 986 }
 987
 988 /* Returns 1 if the resource was freed, 0 if it remains. */
 989 int ldlm_resource_putref(struct ldlm_resource *res)
 990 {
 991         struct ldlm_namespace *ns = res->lr_namespace;
 992         int rc = 0;
 993         ENTRY;
 994
 995         CDEBUG(D_INFO, "putref res: %p count: %d\n", res,
 996                cfs_atomic_read(&res->lr_refcount) - 1);
 997         LASSERTF(cfs_atomic_read(&res->lr_refcount) > 0, "%d",
 998                  cfs_atomic_read(&res->lr_refcount));
 999         LASSERTF(cfs_atomic_read(&res->lr_refcount) < LI_POISON, "%d",
1000                  cfs_atomic_read(&res->lr_refcount));
1001
1002         if (cfs_atomic_dec_and_lock(&res->lr_refcount, &ns->ns_hash_lock)) {
1003                 __ldlm_resource_putref_final(res);
1004                 cfs_spin_unlock(&ns->ns_hash_lock);
1005                 if (res->lr_lvb_data)
1006                         OBD_FREE(res->lr_lvb_data, res->lr_lvb_len);
1007                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1008                 rc = 1;
1009         }
1010
1011         RETURN(rc);
1012 }
1013
1014 /* Returns 1 if the resource was freed, 0 if it remains. */
1015 int ldlm_resource_putref_locked(struct ldlm_resource *res)
1016 {
1017         int rc = 0;
1018         ENTRY;
1019
1020         CDEBUG(D_INFO, "putref res: %p count: %d\n", res,
1021                cfs_atomic_read(&res->lr_refcount) - 1);
1022         LASSERT(cfs_atomic_read(&res->lr_refcount) > 0);
1023         LASSERT(cfs_atomic_read(&res->lr_refcount) < LI_POISON);
1024
1025         LASSERT(cfs_atomic_read(&res->lr_refcount) >= 0);
1026         if (cfs_atomic_dec_and_test(&res->lr_refcount)) {
1027                 __ldlm_resource_putref_final(res);
1028                 if (res->lr_lvb_data)
1029                         OBD_FREE(res->lr_lvb_data, res->lr_lvb_len);
1030                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1031                 rc = 1;
1032         }
1033
1034         RETURN(rc);
1035 }
1036
1037 void ldlm_resource_add_lock(struct ldlm_resource *res, cfs_list_t *head,
1038                             struct ldlm_lock *lock)
1039 {
1040         check_res_locked(res);
1041
1042         ldlm_resource_dump(D_INFO, res);
1043         CDEBUG(D_OTHER, "About to add this lock:\n");
1044         ldlm_lock_dump(D_OTHER, lock, 0);
1045
1046         if (lock->l_destroyed) {
1047                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1048                 return;
1049         }
1050
1051         LASSERT(cfs_list_empty(&lock->l_res_link));
1052
1053         cfs_list_add_tail(&lock->l_res_link, head);
1054 }
1055
1056 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
1057                                      struct ldlm_lock *new)
1058 {
1059         struct ldlm_resource *res = original->l_resource;
1060
1061         check_res_locked(res);
1062
1063         ldlm_resource_dump(D_INFO, res);
1064         CDEBUG(D_OTHER, "About to insert this lock after %p:\n", original);
1065         ldlm_lock_dump(D_OTHER, new, 0);
1066
1067         if (new->l_destroyed) {
1068                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1069                 goto out;
1070         }
1071
1072         LASSERT(cfs_list_empty(&new->l_res_link));
1073
1074         cfs_list_add(&new->l_res_link, &original->l_res_link);
1075  out:;
1076 }
1077
1078 void ldlm_resource_unlink_lock(struct ldlm_lock *lock)
1079 {
1080         int type = lock->l_resource->lr_type;
1081
1082         check_res_locked(lock->l_resource);
1083         if (type == LDLM_IBITS || type == LDLM_PLAIN)
1084                 ldlm_unlink_lock_skiplist(lock);
1085         else if (type == LDLM_EXTENT)
1086                 ldlm_extent_unlink_lock(lock);
1087         cfs_list_del_init(&lock->l_res_link);
1088 }
1089
1090 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc)
1091 {
1092         desc->lr_type = res->lr_type;
1093         desc->lr_name = res->lr_name;
1094 }
1095
1096 void ldlm_dump_all_namespaces(ldlm_side_t client, int level)
1097 {
1098         cfs_list_t *tmp;
1099
1100         if (!((libcfs_debug | D_ERROR) & level))
1101                 return;
1102
1103         cfs_mutex_down(ldlm_namespace_lock(client));
1104
1105         cfs_list_for_each(tmp, ldlm_namespace_list(client)) {
1106                 struct ldlm_namespace *ns;
1107                 ns = cfs_list_entry(tmp, struct ldlm_namespace, ns_list_chain);
1108                 ldlm_namespace_dump(level, ns);
1109         }
1110
1111         cfs_mutex_up(ldlm_namespace_lock(client));
1112 }
1113
1114 void ldlm_namespace_dump(int level, struct ldlm_namespace *ns)
1115 {
1116         cfs_list_t *tmp;
1117
1118         if (!((libcfs_debug | D_ERROR) & level))
1119                 return;
1120
1121         CDEBUG(level, "--- Namespace: %s (rc: %d, side: %s)\n",
1122                ns->ns_name, ns->ns_refcount,
1123                ns_is_client(ns) ? "client" : "server");
1124
1125         if (cfs_time_before(cfs_time_current(), ns->ns_next_dump))
1126                 return;
1127
1128         cfs_spin_lock(&ns->ns_hash_lock);
1129         tmp = ns->ns_root_list.next;
1130         while (tmp != &ns->ns_root_list) {
1131                 struct ldlm_resource *res;
1132                 res = cfs_list_entry(tmp, struct ldlm_resource, lr_childof);
1133
1134                 ldlm_resource_getref(res);
1135                 cfs_spin_unlock(&ns->ns_hash_lock);
1136                 LDLM_RESOURCE_ADDREF(res);
1137
1138                 lock_res(res);
1139                 ldlm_resource_dump(level, res);
1140                 unlock_res(res);
1141
1142                 LDLM_RESOURCE_DELREF(res);
1143                 cfs_spin_lock(&ns->ns_hash_lock);
1144                 tmp = tmp->next;
1145                 ldlm_resource_putref_locked(res);
1146         }
1147         ns->ns_next_dump = cfs_time_shift(10);
1148         cfs_spin_unlock(&ns->ns_hash_lock);
1149 }
1150
1151 void ldlm_resource_dump(int level, struct ldlm_resource *res)
1152 {
1153         cfs_list_t *tmp;
1154         int pos;
1155
1156         CLASSERT(RES_NAME_SIZE == 4);
1157
1158         if (!((libcfs_debug | D_ERROR) & level))
1159                 return;
1160
1161         CDEBUG(level, "--- Resource: %p ("LPU64"/"LPU64"/"LPU64"/"LPU64
1162                ") (rc: %d)\n", res, res->lr_name.name[0], res->lr_name.name[1],
1163                res->lr_name.name[2], res->lr_name.name[3],
1164                cfs_atomic_read(&res->lr_refcount));
1165
1166         if (!cfs_list_empty(&res->lr_granted)) {
1167                 pos = 0;
1168                 CDEBUG(level, "Granted locks:\n");
1169                 cfs_list_for_each(tmp, &res->lr_granted) {
1170                         struct ldlm_lock *lock;
1171                         lock = cfs_list_entry(tmp, struct ldlm_lock,
1172                                               l_res_link);
1173                         ldlm_lock_dump(level, lock, ++pos);
1174                 }
1175         }
1176         if (!cfs_list_empty(&res->lr_converting)) {
1177                 pos = 0;
1178                 CDEBUG(level, "Converting locks:\n");
1179                 cfs_list_for_each(tmp, &res->lr_converting) {
1180                         struct ldlm_lock *lock;
1181                         lock = cfs_list_entry(tmp, struct ldlm_lock,
1182                                               l_res_link);
1183                         ldlm_lock_dump(level, lock, ++pos);
1184                 }
1185         }
1186         if (!cfs_list_empty(&res->lr_waiting)) {
1187                 pos = 0;
1188                 CDEBUG(level, "Waiting locks:\n");
1189                 cfs_list_for_each(tmp, &res->lr_waiting) {
1190                         struct ldlm_lock *lock;
1191                         lock = cfs_list_entry(tmp, struct ldlm_lock,
1192                                               l_res_link);
1193                         ldlm_lock_dump(level, lock, ++pos);
1194                 }
1195         }
1196 }