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 (c) 2002, 2010, Oracle and/or its affiliates. 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                                 CDEBUG(D_DLMTRACE,
 172                                        "not all requested locks are canceled, "
 173                                        "requested: %d, canceled: %d\n", unused,
 174                                        canceled);
 175                                 return -EINVAL;
 176                         }
 177                 } else {
 178                         tmp = ns->ns_max_unused;
 179                         ns->ns_max_unused = 0;
 180                         ldlm_cancel_lru(ns, 0, LDLM_SYNC, LDLM_CANCEL_PASSED);
 181                         ns->ns_max_unused = tmp;
 182                 }
 183                 return count;
 184         }
 185
 186         tmp = simple_strtoul(dummy, &end, 0);
 187         if (dummy == end) {
 188                 CERROR("invalid value written\n");
 189                 return -EINVAL;
 190         }
 191         lru_resize = (tmp == 0);
 192
 193         if (ns_connect_lru_resize(ns)) {
 194                 if (!lru_resize)
 195                         ns->ns_max_unused = (unsigned int)tmp;
 196
 197                 if (tmp > ns->ns_nr_unused)
 198                         tmp = ns->ns_nr_unused;
 199                 tmp = ns->ns_nr_unused - tmp;
 200
 201                 CDEBUG(D_DLMTRACE,
 202                        "changing namespace %s unused locks from %u to %u\n",
 203                        ns->ns_name, ns->ns_nr_unused, (unsigned int)tmp);
 204                 ldlm_cancel_lru(ns, tmp, LDLM_ASYNC, LDLM_CANCEL_PASSED);
 205
 206                 if (!lru_resize) {
 207                         CDEBUG(D_DLMTRACE,
 208                                "disable lru_resize for namespace %s\n",
 209                                ns->ns_name);
 210                         ns->ns_connect_flags &= ~OBD_CONNECT_LRU_RESIZE;
 211                 }
 212         } else {
 213                 CDEBUG(D_DLMTRACE,
 214                        "changing namespace %s max_unused from %u to %u\n",
 215                        ns->ns_name, ns->ns_max_unused, (unsigned int)tmp);
 216                 ns->ns_max_unused = (unsigned int)tmp;
 217                 ldlm_cancel_lru(ns, 0, LDLM_ASYNC, LDLM_CANCEL_PASSED);
 218
 219                 /* Make sure that originally lru resize was supported before
 220                  * turning it on here. */
 221                 if (lru_resize &&
 222                     (ns->ns_orig_connect_flags & OBD_CONNECT_LRU_RESIZE)) {
 223                         CDEBUG(D_DLMTRACE,
 224                                "enable lru_resize for namespace %s\n",
 225                                ns->ns_name);
 226                         ns->ns_connect_flags |= OBD_CONNECT_LRU_RESIZE;
 227                 }
 228         }
 229
 230         return count;
 231 }
 232
 233 void ldlm_proc_namespace(struct ldlm_namespace *ns)
 234 {
 235         struct lprocfs_vars lock_vars[2];
 236         char lock_name[MAX_STRING_SIZE + 1];
 237
 238         LASSERT(ns != NULL);
 239         LASSERT(ns->ns_name != NULL);
 240
 241         lock_name[MAX_STRING_SIZE] = '\0';
 242
 243         memset(lock_vars, 0, sizeof(lock_vars));
 244         lock_vars[0].name = lock_name;
 245
 246         snprintf(lock_name, MAX_STRING_SIZE, "%s/resource_count", ns->ns_name);
 247         lock_vars[0].data = &ns->ns_refcount;
 248         lock_vars[0].read_fptr = lprocfs_rd_atomic;
 249         lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 250
 251         snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_count", ns->ns_name);
 252         lock_vars[0].data = &ns->ns_locks;
 253         lock_vars[0].read_fptr = lprocfs_rd_atomic;
 254         lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 255
 256         if (ns_is_client(ns)) {
 257                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_unused_count",
 258                          ns->ns_name);
 259                 lock_vars[0].data = &ns->ns_nr_unused;
 260                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 261                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 262
 263                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lru_size",
 264                          ns->ns_name);
 265                 lock_vars[0].data = ns;
 266                 lock_vars[0].read_fptr = lprocfs_rd_lru_size;
 267                 lock_vars[0].write_fptr = lprocfs_wr_lru_size;
 268                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 269
 270                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lru_max_age",
 271                          ns->ns_name);
 272                 lock_vars[0].data = &ns->ns_max_age;
 273                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 274                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 275                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 276         } else {
 277                 snprintf(lock_name, MAX_STRING_SIZE, "%s/ctime_age_limit",
 278                          ns->ns_name);
 279                 lock_vars[0].data = &ns->ns_ctime_age_limit;
 280                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 281                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 282                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 283
 284                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_timeouts",
 285                          ns->ns_name);
 286                 lock_vars[0].data = &ns->ns_timeouts;
 287                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 288                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 289
 290                 snprintf(lock_name, MAX_STRING_SIZE, "%s/max_nolock_bytes",
 291                          ns->ns_name);
 292                 lock_vars[0].data = &ns->ns_max_nolock_size;
 293                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 294                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 295                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 296
 297                 snprintf(lock_name, MAX_STRING_SIZE, "%s/contention_seconds",
 298                          ns->ns_name);
 299                 lock_vars[0].data = &ns->ns_contention_time;
 300                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 301                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 302                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 303
 304                 snprintf(lock_name, MAX_STRING_SIZE, "%s/contended_locks",
 305                          ns->ns_name);
 306                 lock_vars[0].data = &ns->ns_contended_locks;
 307                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 308                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 309                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 310         }
 311 }
 312 #undef MAX_STRING_SIZE
 313 #else
 314 #define ldlm_proc_namespace(ns) do {} while (0)
 315 #endif /* LPROCFS */
 316
 317 struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
 318                                           ldlm_side_t client, ldlm_appetite_t apt)
 319 {
 320         struct ldlm_namespace *ns = NULL;
 321         cfs_list_t *bucket;
 322         int rc, idx, namelen;
 323         ENTRY;
 324
 325         rc = ldlm_get_ref();
 326         if (rc) {
 327                 CERROR("ldlm_get_ref failed: %d\n", rc);
 328                 RETURN(NULL);
 329         }
 330
 331         OBD_ALLOC_PTR(ns);
 332         if (!ns)
 333                 GOTO(out_ref, NULL);
 334
 335         OBD_VMALLOC(ns->ns_hash, sizeof(*ns->ns_hash) * RES_HASH_SIZE);
 336         if (!ns->ns_hash)
 337                 GOTO(out_ns, NULL);
 338
 339         ns->ns_appetite = apt;
 340
 341         LASSERT(obd != NULL);
 342         ns->ns_obd = obd;
 343
 344         namelen = strlen(name);
 345         OBD_ALLOC(ns->ns_name, namelen + 1);
 346         if (!ns->ns_name)
 347                 GOTO(out_hash, NULL);
 348
 349         strcpy(ns->ns_name, name);
 350
 351         CFS_INIT_LIST_HEAD(&ns->ns_root_list);
 352         CFS_INIT_LIST_HEAD(&ns->ns_list_chain);
 353         ns->ns_refcount = 0;
 354         ns->ns_client = client;
 355         cfs_spin_lock_init(&ns->ns_hash_lock);
 356         cfs_atomic_set(&ns->ns_locks, 0);
 357         ns->ns_resources = 0;
 358         cfs_waitq_init(&ns->ns_waitq);
 359         ns->ns_max_nolock_size = NS_DEFAULT_MAX_NOLOCK_BYTES;
 360         ns->ns_contention_time = NS_DEFAULT_CONTENTION_SECONDS;
 361         ns->ns_contended_locks = NS_DEFAULT_CONTENDED_LOCKS;
 362
 363         for (bucket = ns->ns_hash + RES_HASH_SIZE - 1; bucket >= ns->ns_hash;
 364              bucket--)
 365                 CFS_INIT_LIST_HEAD(bucket);
 366
 367         CFS_INIT_LIST_HEAD(&ns->ns_unused_list);
 368         ns->ns_nr_unused = 0;
 369         ns->ns_max_unused = LDLM_DEFAULT_LRU_SIZE;
 370         ns->ns_max_age = LDLM_DEFAULT_MAX_ALIVE;
 371         ns->ns_ctime_age_limit = LDLM_CTIME_AGE_LIMIT;
 372         ns->ns_timeouts = 0;
 373         cfs_spin_lock_init(&ns->ns_unused_lock);
 374         ns->ns_orig_connect_flags = 0;
 375         ns->ns_connect_flags = 0;
 376         ldlm_proc_namespace(ns);
 377
 378         idx = cfs_atomic_read(ldlm_namespace_nr(client));
 379         rc = ldlm_pool_init(&ns->ns_pool, ns, idx, client);
 380         if (rc) {
 381                 CERROR("Can't initialize lock pool, rc %d\n", rc);
 382                 GOTO(out_proc, rc);
 383         }
 384
 385         at_init(&ns->ns_at_estimate, ldlm_enqueue_min, 0);
 386
 387         ldlm_namespace_register(ns, client);
 388         RETURN(ns);
 389 out_proc:
 390         ldlm_namespace_cleanup(ns, 0);
 391         OBD_FREE(ns->ns_name, namelen + 1);
 392 out_hash:
 393         OBD_VFREE(ns->ns_hash, sizeof(*ns->ns_hash) * RES_HASH_SIZE);
 394 out_ns:
 395         OBD_FREE_PTR(ns);
 396 out_ref:
 397         ldlm_put_ref();
 398         RETURN(NULL);
 399 }
 400
 401 extern struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
 402
 403 /* If flags contains FL_LOCAL_ONLY, don't try to tell the server, just cleanup.
 404  * This is currently only used for recovery, and we make certain assumptions
 405  * as a result--notably, that we shouldn't cancel locks with refs. -phil
 406  *
 407  * Called with the ns_lock held. */
 408 static void cleanup_resource(struct ldlm_resource *res, cfs_list_t *q,
 409                              int flags)
 410 {
 411         cfs_list_t *tmp;
 412         int rc = 0, client = ns_is_client(res->lr_namespace);
 413         int local_only = (flags & LDLM_FL_LOCAL_ONLY);
 414         ENTRY;
 415
 416
 417         do {
 418                 struct ldlm_lock *lock = NULL;
 419
 420                 /* first, we look for non-cleaned-yet lock
 421                  * all cleaned locks are marked by CLEANED flag */
 422                 lock_res(res);
 423                 cfs_list_for_each(tmp, q) {
 424                         lock = cfs_list_entry(tmp, struct ldlm_lock,
 425                                               l_res_link);
 426                         if (lock->l_flags & LDLM_FL_CLEANED) {
 427                                 lock = NULL;
 428                                 continue;
 429                         }
 430                         LDLM_LOCK_GET(lock);
 431                         lock->l_flags |= LDLM_FL_CLEANED;
 432                         break;
 433                 }
 434
 435                 if (lock == NULL) {
 436                         unlock_res(res);
 437                         break;
 438                 }
 439
 440                 /* Set CBPENDING so nothing in the cancellation path
 441                  * can match this lock */
 442                 lock->l_flags |= LDLM_FL_CBPENDING;
 443                 lock->l_flags |= LDLM_FL_FAILED;
 444                 lock->l_flags |= flags;
 445
 446                 /* ... without sending a CANCEL message for local_only. */
 447                 if (local_only)
 448                         lock->l_flags |= LDLM_FL_LOCAL_ONLY;
 449
 450                 if (local_only && (lock->l_readers || lock->l_writers)) {
 451                         /* This is a little bit gross, but much better than the
 452                          * alternative: pretend that we got a blocking AST from
 453                          * the server, so that when the lock is decref'd, it
 454                          * will go away ... */
 455                         unlock_res(res);
 456                         LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
 457                         if (lock->l_completion_ast)
 458                                 lock->l_completion_ast(lock, 0, NULL);
 459                         LDLM_LOCK_RELEASE(lock);
 460                         continue;
 461                 }
 462
 463                 if (client) {
 464                         struct lustre_handle lockh;
 465
 466                         unlock_res(res);
 467                         ldlm_lock2handle(lock, &lockh);
 468                         rc = ldlm_cli_cancel(&lockh);
 469                         if (rc)
 470                                 CERROR("ldlm_cli_cancel: %d\n", rc);
 471                 } else {
 472                         ldlm_resource_unlink_lock(lock);
 473                         unlock_res(res);
 474                         LDLM_DEBUG(lock, "Freeing a lock still held by a "
 475                                    "client node");
 476                         ldlm_lock_destroy(lock);
 477                 }
 478                 LDLM_LOCK_RELEASE(lock);
 479         } while (1);
 480
 481         EXIT;
 482 }
 483
 484 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, int flags)
 485 {
 486         cfs_list_t *tmp;
 487         int i;
 488
 489         if (ns == NULL) {
 490                 CDEBUG(D_INFO, "NULL ns, skipping cleanup\n");
 491                 return ELDLM_OK;
 492         }
 493
 494         for (i = 0; i < RES_HASH_SIZE; i++) {
 495                 cfs_spin_lock(&ns->ns_hash_lock);
 496                 tmp = ns->ns_hash[i].next;
 497                 while (tmp != &(ns->ns_hash[i])) {
 498                         struct ldlm_resource *res;
 499                         res = cfs_list_entry(tmp, struct ldlm_resource,
 500                                              lr_hash);
 501                         ldlm_resource_getref(res);
 502                         cfs_spin_unlock(&ns->ns_hash_lock);
 503                         LDLM_RESOURCE_ADDREF(res);
 504
 505                         cleanup_resource(res, &res->lr_granted, flags);
 506                         cleanup_resource(res, &res->lr_converting, flags);
 507                         cleanup_resource(res, &res->lr_waiting, flags);
 508
 509                         cfs_spin_lock(&ns->ns_hash_lock);
 510                         tmp = tmp->next;
 511
 512                         /* XXX: former stuff caused issues in case of race
 513                          * between ldlm_namespace_cleanup() and lockd() when
 514                          * client gets blocking ast when lock gets distracted by
 515                          * server. This is 1_4 branch solution, let's see how
 516                          * will it behave. */
 517                         LDLM_RESOURCE_DELREF(res);
 518                         if (!ldlm_resource_putref_locked(res)) {
 519                                 CERROR("Namespace %s resource refcount nonzero "
 520                                        "(%d) after lock cleanup; forcing "
 521                                        "cleanup.\n",
 522                                        ns->ns_name,
 523                                        cfs_atomic_read(&res->lr_refcount));
 524                                 CERROR("Resource: %p ("LPU64"/"LPU64"/"LPU64"/"
 525                                        LPU64") (rc: %d)\n", res,
 526                                        res->lr_name.name[0],
 527                                        res->lr_name.name[1],
 528                                        res->lr_name.name[2],
 529                                        res->lr_name.name[3],
 530                                        cfs_atomic_read(&res->lr_refcount));
 531                         }
 532                 }
 533                 cfs_spin_unlock(&ns->ns_hash_lock);
 534         }
 535
 536         return ELDLM_OK;
 537 }
 538
 539 static int __ldlm_namespace_free(struct ldlm_namespace *ns, int force)
 540 {
 541         ENTRY;
 542
 543         /* At shutdown time, don't call the cancellation callback */
 544         ldlm_namespace_cleanup(ns, force ? LDLM_FL_LOCAL_ONLY : 0);
 545
 546         if (ns->ns_refcount > 0) {
 547                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 548                 int rc;
 549                 CDEBUG(D_DLMTRACE,
 550                        "dlm namespace %s free waiting on refcount %d\n",
 551                        ns->ns_name, ns->ns_refcount);
 552 force_wait:
 553                 if (force)
 554                         lwi = LWI_TIMEOUT(obd_timeout * CFS_HZ / 4, NULL, NULL);
 555
 556                 rc = l_wait_event(ns->ns_waitq,
 557                                   ns->ns_refcount == 0, &lwi);
 558
 559                 /* Forced cleanups should be able to reclaim all references,
 560                  * so it's safe to wait forever... we can't leak locks... */
 561                 if (force && rc == -ETIMEDOUT) {
 562                         LCONSOLE_ERROR("Forced cleanup waiting for %s "
 563                                        "namespace with %d resources in use, "
 564                                        "(rc=%d)\n", ns->ns_name,
 565                                        ns->ns_refcount, rc);
 566                         GOTO(force_wait, rc);
 567                 }
 568
 569                 if (ns->ns_refcount) {
 570                         LCONSOLE_ERROR("Cleanup waiting for %s namespace "
 571                                        "with %d resources in use, (rc=%d)\n",
 572                                        ns->ns_name,
 573                                        ns->ns_refcount, rc);
 574                         RETURN(ELDLM_NAMESPACE_EXISTS);
 575                 }
 576                 CDEBUG(D_DLMTRACE,
 577                        "dlm namespace %s free done waiting\n", ns->ns_name);
 578         }
 579
 580         RETURN(ELDLM_OK);
 581 }
 582
 583 /**
 584  * Performs various cleanups for passed \a ns to make it drop refc and be ready
 585  * for freeing. Waits for refc == 0.
 586  *
 587  * The following is done:
 588  * (0) Unregister \a ns from its list to make inaccessible for potential users
 589  * like pools thread and others;
 590  * (1) Clear all locks in \a ns.
 591  */
 592 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
 593                                struct obd_import *imp,
 594                                int force)
 595 {
 596         int rc;
 597         ENTRY;
 598         if (!ns) {
 599                 EXIT;
 600                 return;
 601         }
 602
 603
 604         /*
 605          * Can fail with -EINTR when force == 0 in which case try harder.
 606          */
 607         rc = __ldlm_namespace_free(ns, force);
 608         if (rc != ELDLM_OK) {
 609                 if (imp) {
 610                         ptlrpc_disconnect_import(imp, 0);
 611                         ptlrpc_invalidate_import(imp);
 612                 }
 613
 614                 /*
 615                  * With all requests dropped and the import inactive
 616                  * we are gaurenteed all reference will be dropped.
 617                  */
 618                 rc = __ldlm_namespace_free(ns, 1);
 619                 LASSERT(rc == 0);
 620         }
 621         EXIT;
 622 }
 623
 624 /**
 625  * Performs freeing memory structures related to \a ns. This is only done when
 626  * ldlm_namespce_free_prior() successfully removed all resources referencing
 627  * \a ns and its refc == 0.
 628  */
 629 void ldlm_namespace_free_post(struct ldlm_namespace *ns)
 630 {
 631         ENTRY;
 632         if (!ns) {
 633                 EXIT;
 634                 return;
 635         }
 636
 637
 638         /*
 639          * Make sure that nobody can find this ns in its list.
 640          */
 641         ldlm_namespace_unregister(ns, ns->ns_client);
 642         /*
 643          * Fini pool _before_ parent proc dir is removed. This is important as
 644          * ldlm_pool_fini() removes own proc dir which is child to @dir. Removing
 645          * it after @dir may cause oops.
 646          */
 647         ldlm_pool_fini(&ns->ns_pool);
 648
 649 #ifdef LPROCFS
 650         {
 651                 struct proc_dir_entry *dir;
 652                 dir = lprocfs_srch(ldlm_ns_proc_dir, ns->ns_name);
 653                 if (dir == NULL) {
 654                         CERROR("dlm namespace %s has no procfs dir?\n",
 655                                ns->ns_name);
 656                 } else {
 657                         lprocfs_remove(&dir);
 658                 }
 659         }
 660 #endif
 661
 662         OBD_VFREE(ns->ns_hash, sizeof(*ns->ns_hash) * RES_HASH_SIZE);
 663         OBD_FREE(ns->ns_name, strlen(ns->ns_name) + 1);
 664
 665         /*
 666          * Namespace \a ns should be not on list in this time, otherwise this
 667          * will cause issues realted to using freed \a ns in pools thread.
 668          */
 669         LASSERT(cfs_list_empty(&ns->ns_list_chain));
 670         OBD_FREE_PTR(ns);
 671         ldlm_put_ref();
 672         EXIT;
 673 }
 674
 675
 676 /* Cleanup the resource, and free namespace.
 677  * bug 12864:
 678  * Deadlock issue:
 679  * proc1: destroy import
 680  *        class_disconnect_export(grab cl_sem) ->
 681  *              -> ldlm_namespace_free ->
 682  *              -> lprocfs_remove(grab _lprocfs_lock).
 683  * proc2: read proc info
 684  *        lprocfs_fops_read(grab _lprocfs_lock) ->
 685  *              -> osc_rd_active, etc(grab cl_sem).
 686  *
 687  * So that I have to split the ldlm_namespace_free into two parts - the first
 688  * part ldlm_namespace_free_prior is used to cleanup the resource which is
 689  * being used; the 2nd part ldlm_namespace_free_post is used to unregister the
 690  * lprocfs entries, and then free memory. It will be called w/o cli->cl_sem
 691  * held.
 692  */
 693 void ldlm_namespace_free(struct ldlm_namespace *ns,
 694                          struct obd_import *imp,
 695                          int force)
 696 {
 697         ldlm_namespace_free_prior(ns, imp, force);
 698         ldlm_namespace_free_post(ns);
 699 }
 700
 701
 702 void ldlm_namespace_get_locked(struct ldlm_namespace *ns)
 703 {
 704         ns->ns_refcount++;
 705 }
 706
 707 void ldlm_namespace_get(struct ldlm_namespace *ns)
 708 {
 709         cfs_spin_lock(&ns->ns_hash_lock);
 710         ldlm_namespace_get_locked(ns);
 711         cfs_spin_unlock(&ns->ns_hash_lock);
 712 }
 713
 714 void ldlm_namespace_put_locked(struct ldlm_namespace *ns, int wakeup)
 715 {
 716         LASSERT(ns->ns_refcount > 0);
 717         ns->ns_refcount--;
 718         if (ns->ns_refcount == 0 && wakeup)
 719                 cfs_waitq_signal(&ns->ns_waitq);
 720 }
 721
 722 void ldlm_namespace_put(struct ldlm_namespace *ns, int wakeup)
 723 {
 724         cfs_spin_lock(&ns->ns_hash_lock);
 725         ldlm_namespace_put_locked(ns, wakeup);
 726         cfs_spin_unlock(&ns->ns_hash_lock);
 727 }
 728
 729 /* Register @ns in the list of namespaces */
 730 void ldlm_namespace_register(struct ldlm_namespace *ns, ldlm_side_t client)
 731 {
 732         cfs_mutex_down(ldlm_namespace_lock(client));
 733         LASSERT(cfs_list_empty(&ns->ns_list_chain));
 734         cfs_list_add(&ns->ns_list_chain, ldlm_namespace_list(client));
 735         cfs_atomic_inc(ldlm_namespace_nr(client));
 736         cfs_mutex_up(ldlm_namespace_lock(client));
 737 }
 738
 739 /* Unregister @ns from the list of namespaces */
 740 void ldlm_namespace_unregister(struct ldlm_namespace *ns, ldlm_side_t client)
 741 {
 742         cfs_mutex_down(ldlm_namespace_lock(client));
 743         LASSERT(!cfs_list_empty(&ns->ns_list_chain));
 744         /*
 745          * Some asserts and possibly other parts of code still using
 746          * list_empty(&ns->ns_list_chain). This is why it is important
 747          * to use list_del_init() here.
 748          */
 749         cfs_list_del_init(&ns->ns_list_chain);
 750         cfs_atomic_dec(ldlm_namespace_nr(client));
 751         cfs_mutex_up(ldlm_namespace_lock(client));
 752 }
 753
 754 /* Should be called under ldlm_namespace_lock(client) taken */
 755 void ldlm_namespace_move_locked(struct ldlm_namespace *ns, ldlm_side_t client)
 756 {
 757         LASSERT(!cfs_list_empty(&ns->ns_list_chain));
 758         LASSERT_SEM_LOCKED(ldlm_namespace_lock(client));
 759         cfs_list_move_tail(&ns->ns_list_chain, ldlm_namespace_list(client));
 760 }
 761
 762 /* Should be called under ldlm_namespace_lock(client) taken */
 763 struct ldlm_namespace *ldlm_namespace_first_locked(ldlm_side_t client)
 764 {
 765         LASSERT_SEM_LOCKED(ldlm_namespace_lock(client));
 766         LASSERT(!cfs_list_empty(ldlm_namespace_list(client)));
 767         return container_of(ldlm_namespace_list(client)->next,
 768                 struct ldlm_namespace, ns_list_chain);
 769 }
 770 static __u32 ldlm_hash_fn(struct ldlm_resource *parent,
 771                           const struct ldlm_res_id *name)
 772 {
 773         __u32 hash = 0;
 774         int i;
 775
 776         for (i = 0; i < RES_NAME_SIZE; i++)
 777                 hash += name->name[i];
 778
 779         hash += (__u32)((unsigned long)parent >> 4);
 780
 781         return (hash & RES_HASH_MASK);
 782 }
 783
 784 static struct ldlm_resource *ldlm_resource_new(void)
 785 {
 786         struct ldlm_resource *res;
 787         int idx;
 788
 789         OBD_SLAB_ALLOC_PTR_GFP(res, ldlm_resource_slab, CFS_ALLOC_IO);
 790         if (res == NULL)
 791                 return NULL;
 792
 793         memset(res, 0, sizeof(*res));
 794
 795         CFS_INIT_LIST_HEAD(&res->lr_children);
 796         CFS_INIT_LIST_HEAD(&res->lr_childof);
 797         CFS_INIT_LIST_HEAD(&res->lr_granted);
 798         CFS_INIT_LIST_HEAD(&res->lr_converting);
 799         CFS_INIT_LIST_HEAD(&res->lr_waiting);
 800
 801         /* initialize interval trees for each lock mode*/
 802         for (idx = 0; idx < LCK_MODE_NUM; idx++) {
 803                 res->lr_itree[idx].lit_size = 0;
 804                 res->lr_itree[idx].lit_mode = 1 << idx;
 805                 res->lr_itree[idx].lit_root = NULL;
 806         }
 807
 808         cfs_atomic_set(&res->lr_refcount, 1);
 809         cfs_spin_lock_init(&res->lr_lock);
 810         lu_ref_init(&res->lr_reference);
 811
 812         /* one who creates the resource must unlock
 813          * the semaphore after lvb initialization */
 814         cfs_init_mutex_locked(&res->lr_lvb_sem);
 815
 816         return res;
 817 }
 818
 819 /* must be called with hash lock held */
 820 static struct ldlm_resource *
 821 ldlm_resource_find(struct ldlm_namespace *ns, const struct ldlm_res_id *name,
 822                    __u32 hash)
 823 {
 824         cfs_list_t *bucket, *tmp;
 825         struct ldlm_resource *res;
 826
 827         LASSERT_SPIN_LOCKED(&ns->ns_hash_lock);
 828         bucket = ns->ns_hash + hash;
 829
 830         cfs_list_for_each(tmp, bucket) {
 831                 res = cfs_list_entry(tmp, struct ldlm_resource, lr_hash);
 832                 if (memcmp(&res->lr_name, name, sizeof(res->lr_name)) == 0)
 833                         return res;
 834         }
 835
 836         return NULL;
 837 }
 838
 839 /* Args: locked namespace
 840  * Returns: newly-allocated, referenced, unlocked resource */
 841 static struct ldlm_resource *
 842 ldlm_resource_add(struct ldlm_namespace *ns, struct ldlm_resource *parent,
 843                   const struct ldlm_res_id *name, __u32 hash, ldlm_type_t type)
 844 {
 845         cfs_list_t *bucket;
 846         struct ldlm_resource *res, *old_res;
 847         ENTRY;
 848
 849         LASSERTF(type >= LDLM_MIN_TYPE && type < LDLM_MAX_TYPE,
 850                  "type: %d\n", type);
 851
 852         res = ldlm_resource_new();
 853         if (!res)
 854                 RETURN(NULL);
 855
 856         res->lr_name = *name;
 857         res->lr_namespace = ns;
 858         res->lr_type = type;
 859         res->lr_most_restr = LCK_NL;
 860
 861         cfs_spin_lock(&ns->ns_hash_lock);
 862         old_res = ldlm_resource_find(ns, name, hash);
 863         if (old_res) {
 864                 /* someone won the race and added the resource before */
 865                 ldlm_resource_getref(old_res);
 866                 cfs_spin_unlock(&ns->ns_hash_lock);
 867                 /* clean lu_ref for failed resource */
 868                 lu_ref_fini(&res->lr_reference);
 869                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
 870                 /* synchronize WRT resource creation */
 871                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
 872                         cfs_down(&old_res->lr_lvb_sem);
 873                         cfs_up(&old_res->lr_lvb_sem);
 874                 }
 875                 RETURN(old_res);
 876         }
 877
 878         /* we won! let's add the resource */
 879         bucket = ns->ns_hash + hash;
 880         cfs_list_add(&res->lr_hash, bucket);
 881         ns->ns_resources++;
 882         ldlm_namespace_get_locked(ns);
 883
 884         if (parent == NULL) {
 885                 cfs_list_add(&res->lr_childof, &ns->ns_root_list);
 886         } else {
 887                 res->lr_parent = parent;
 888                 cfs_list_add(&res->lr_childof, &parent->lr_children);
 889         }
 890         cfs_spin_unlock(&ns->ns_hash_lock);
 891
 892         if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
 893                 int rc;
 894
 895                 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CREATE_RESOURCE, 2);
 896                 rc = ns->ns_lvbo->lvbo_init(res);
 897                 if (rc)
 898                         CERROR("lvbo_init failed for resource "
 899                                LPU64": rc %d\n", name->name[0], rc);
 900                 /* we create resource with locked lr_lvb_sem */
 901                 cfs_up(&res->lr_lvb_sem);
 902         }
 903
 904         RETURN(res);
 905 }
 906
 907 /* Args: unlocked namespace
 908  * Locks: takes and releases ns->ns_lock and res->lr_lock
 909  * Returns: referenced, unlocked ldlm_resource or NULL */
 910 struct ldlm_resource *
 911 ldlm_resource_get(struct ldlm_namespace *ns, struct ldlm_resource *parent,
 912                   const struct ldlm_res_id *name, ldlm_type_t type, int create)
 913 {
 914         __u32 hash = ldlm_hash_fn(parent, name);
 915         struct ldlm_resource *res = NULL;
 916         ENTRY;
 917
 918         LASSERT(ns != NULL);
 919         LASSERT(ns->ns_hash != NULL);
 920         LASSERT(name->name[0] != 0);
 921
 922         cfs_spin_lock(&ns->ns_hash_lock);
 923         res = ldlm_resource_find(ns, name, hash);
 924         if (res) {
 925                 ldlm_resource_getref(res);
 926                 cfs_spin_unlock(&ns->ns_hash_lock);
 927                 /* synchronize WRT resource creation */
 928                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
 929                         cfs_down(&res->lr_lvb_sem);
 930                         cfs_up(&res->lr_lvb_sem);
 931                 }
 932                 RETURN(res);
 933         }
 934         cfs_spin_unlock(&ns->ns_hash_lock);
 935
 936         if (create == 0)
 937                 RETURN(NULL);
 938
 939         res = ldlm_resource_add(ns, parent, name, hash, type);
 940         RETURN(res);
 941 }
 942
 943 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res)
 944 {
 945         LASSERT(res != NULL);
 946         LASSERT(res != LP_POISON);
 947         cfs_atomic_inc(&res->lr_refcount);
 948         CDEBUG(D_INFO, "getref res: %p count: %d\n", res,
 949                cfs_atomic_read(&res->lr_refcount));
 950         return res;
 951 }
 952
 953 void __ldlm_resource_putref_final(struct ldlm_resource *res)
 954 {
 955         struct ldlm_namespace *ns = res->lr_namespace;
 956
 957         LASSERT_SPIN_LOCKED(&ns->ns_hash_lock);
 958
 959         if (!cfs_list_empty(&res->lr_granted)) {
 960                 ldlm_resource_dump(D_ERROR, res);
 961                 LBUG();
 962         }
 963
 964         if (!cfs_list_empty(&res->lr_converting)) {
 965                 ldlm_resource_dump(D_ERROR, res);
 966                 LBUG();
 967         }
 968
 969         if (!cfs_list_empty(&res->lr_waiting)) {
 970                 ldlm_resource_dump(D_ERROR, res);
 971                 LBUG();
 972         }
 973
 974         if (!cfs_list_empty(&res->lr_children)) {
 975                 ldlm_resource_dump(D_ERROR, res);
 976                 LBUG();
 977         }
 978
 979         /* Pass 0 here to not wake ->ns_waitq up yet, we will do it few
 980          * lines below when all children are freed. */
 981         ldlm_namespace_put_locked(ns, 0);
 982         cfs_list_del_init(&res->lr_hash);
 983         cfs_list_del_init(&res->lr_childof);
 984         lu_ref_fini(&res->lr_reference);
 985
 986         ns->ns_resources--;
 987         if (ns->ns_resources == 0)
 988                 cfs_waitq_signal(&ns->ns_waitq);
 989 }
 990
 991 /* Returns 1 if the resource was freed, 0 if it remains. */
 992 int ldlm_resource_putref(struct ldlm_resource *res)
 993 {
 994         struct ldlm_namespace *ns = res->lr_namespace;
 995         int rc = 0;
 996         ENTRY;
 997
 998         CDEBUG(D_INFO, "putref res: %p count: %d\n", res,
 999                cfs_atomic_read(&res->lr_refcount) - 1);
1000         LASSERTF(cfs_atomic_read(&res->lr_refcount) > 0, "%d",
1001                  cfs_atomic_read(&res->lr_refcount));
1002         LASSERTF(cfs_atomic_read(&res->lr_refcount) < LI_POISON, "%d",
1003                  cfs_atomic_read(&res->lr_refcount));
1004
1005         if (cfs_atomic_dec_and_lock(&res->lr_refcount, &ns->ns_hash_lock)) {
1006                 __ldlm_resource_putref_final(res);
1007                 cfs_spin_unlock(&ns->ns_hash_lock);
1008                 if (res->lr_lvb_data)
1009                         OBD_FREE(res->lr_lvb_data, res->lr_lvb_len);
1010                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1011                 rc = 1;
1012         }
1013
1014         RETURN(rc);
1015 }
1016
1017 /* Returns 1 if the resource was freed, 0 if it remains. */
1018 int ldlm_resource_putref_locked(struct ldlm_resource *res)
1019 {
1020         int rc = 0;
1021         ENTRY;
1022
1023         CDEBUG(D_INFO, "putref res: %p count: %d\n", res,
1024                cfs_atomic_read(&res->lr_refcount) - 1);
1025         LASSERT(cfs_atomic_read(&res->lr_refcount) > 0);
1026         LASSERT(cfs_atomic_read(&res->lr_refcount) < LI_POISON);
1027
1028         LASSERT(cfs_atomic_read(&res->lr_refcount) >= 0);
1029         if (cfs_atomic_dec_and_test(&res->lr_refcount)) {
1030                 __ldlm_resource_putref_final(res);
1031                 if (res->lr_lvb_data)
1032                         OBD_FREE(res->lr_lvb_data, res->lr_lvb_len);
1033                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1034                 rc = 1;
1035         }
1036
1037         RETURN(rc);
1038 }
1039
1040 void ldlm_resource_add_lock(struct ldlm_resource *res, cfs_list_t *head,
1041                             struct ldlm_lock *lock)
1042 {
1043         check_res_locked(res);
1044
1045         ldlm_resource_dump(D_INFO, res);
1046         CDEBUG(D_OTHER, "About to add this lock:\n");
1047         ldlm_lock_dump(D_OTHER, lock, 0);
1048
1049         if (lock->l_destroyed) {
1050                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1051                 return;
1052         }
1053
1054         LASSERT(cfs_list_empty(&lock->l_res_link));
1055
1056         cfs_list_add_tail(&lock->l_res_link, head);
1057 }
1058
1059 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
1060                                      struct ldlm_lock *new)
1061 {
1062         struct ldlm_resource *res = original->l_resource;
1063
1064         check_res_locked(res);
1065
1066         ldlm_resource_dump(D_INFO, res);
1067         CDEBUG(D_OTHER, "About to insert this lock after %p:\n", original);
1068         ldlm_lock_dump(D_OTHER, new, 0);
1069
1070         if (new->l_destroyed) {
1071                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1072                 goto out;
1073         }
1074
1075         LASSERT(cfs_list_empty(&new->l_res_link));
1076
1077         cfs_list_add(&new->l_res_link, &original->l_res_link);
1078  out:;
1079 }
1080
1081 void ldlm_resource_unlink_lock(struct ldlm_lock *lock)
1082 {
1083         int type = lock->l_resource->lr_type;
1084
1085         check_res_locked(lock->l_resource);
1086         if (type == LDLM_IBITS || type == LDLM_PLAIN)
1087                 ldlm_unlink_lock_skiplist(lock);
1088         else if (type == LDLM_EXTENT)
1089                 ldlm_extent_unlink_lock(lock);
1090         cfs_list_del_init(&lock->l_res_link);
1091 }
1092
1093 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc)
1094 {
1095         desc->lr_type = res->lr_type;
1096         desc->lr_name = res->lr_name;
1097 }
1098
1099 void ldlm_dump_all_namespaces(ldlm_side_t client, int level)
1100 {
1101         cfs_list_t *tmp;
1102
1103         if (!((libcfs_debug | D_ERROR) & level))
1104                 return;
1105
1106         cfs_mutex_down(ldlm_namespace_lock(client));
1107
1108         cfs_list_for_each(tmp, ldlm_namespace_list(client)) {
1109                 struct ldlm_namespace *ns;
1110                 ns = cfs_list_entry(tmp, struct ldlm_namespace, ns_list_chain);
1111                 ldlm_namespace_dump(level, ns);
1112         }
1113
1114         cfs_mutex_up(ldlm_namespace_lock(client));
1115 }
1116
1117 void ldlm_namespace_dump(int level, struct ldlm_namespace *ns)
1118 {
1119         cfs_list_t *tmp;
1120
1121         if (!((libcfs_debug | D_ERROR) & level))
1122                 return;
1123
1124         CDEBUG(level, "--- Namespace: %s (rc: %d, side: %s)\n",
1125                ns->ns_name, ns->ns_refcount,
1126                ns_is_client(ns) ? "client" : "server");
1127
1128         if (cfs_time_before(cfs_time_current(), ns->ns_next_dump))
1129                 return;
1130
1131         cfs_spin_lock(&ns->ns_hash_lock);
1132         tmp = ns->ns_root_list.next;
1133         while (tmp != &ns->ns_root_list) {
1134                 struct ldlm_resource *res;
1135                 res = cfs_list_entry(tmp, struct ldlm_resource, lr_childof);
1136
1137                 ldlm_resource_getref(res);
1138                 cfs_spin_unlock(&ns->ns_hash_lock);
1139                 LDLM_RESOURCE_ADDREF(res);
1140
1141                 lock_res(res);
1142                 ldlm_resource_dump(level, res);
1143                 unlock_res(res);
1144
1145                 LDLM_RESOURCE_DELREF(res);
1146                 cfs_spin_lock(&ns->ns_hash_lock);
1147                 tmp = tmp->next;
1148                 ldlm_resource_putref_locked(res);
1149         }
1150         ns->ns_next_dump = cfs_time_shift(10);
1151         cfs_spin_unlock(&ns->ns_hash_lock);
1152 }
1153
1154 void ldlm_resource_dump(int level, struct ldlm_resource *res)
1155 {
1156         cfs_list_t *tmp;
1157         int pos;
1158
1159         CLASSERT(RES_NAME_SIZE == 4);
1160
1161         if (!((libcfs_debug | D_ERROR) & level))
1162                 return;
1163
1164         CDEBUG(level, "--- Resource: %p ("LPU64"/"LPU64"/"LPU64"/"LPU64
1165                ") (rc: %d)\n", res, res->lr_name.name[0], res->lr_name.name[1],
1166                res->lr_name.name[2], res->lr_name.name[3],
1167                cfs_atomic_read(&res->lr_refcount));
1168
1169         if (!cfs_list_empty(&res->lr_granted)) {
1170                 pos = 0;
1171                 CDEBUG(level, "Granted locks:\n");
1172                 cfs_list_for_each(tmp, &res->lr_granted) {
1173                         struct ldlm_lock *lock;
1174                         lock = cfs_list_entry(tmp, struct ldlm_lock,
1175                                               l_res_link);
1176                         ldlm_lock_dump(level, lock, ++pos);
1177                 }
1178         }
1179         if (!cfs_list_empty(&res->lr_converting)) {
1180                 pos = 0;
1181                 CDEBUG(level, "Converting locks:\n");
1182                 cfs_list_for_each(tmp, &res->lr_converting) {
1183                         struct ldlm_lock *lock;
1184                         lock = cfs_list_entry(tmp, struct ldlm_lock,
1185                                               l_res_link);
1186                         ldlm_lock_dump(level, lock, ++pos);
1187                 }
1188         }
1189         if (!cfs_list_empty(&res->lr_waiting)) {
1190                 pos = 0;
1191                 CDEBUG(level, "Waiting locks:\n");
1192                 cfs_list_for_each(tmp, &res->lr_waiting) {
1193                         struct ldlm_lock *lock;
1194                         lock = cfs_list_entry(tmp, struct ldlm_lock,
1195                                               l_res_link);
1196                         ldlm_lock_dump(level, lock, ++pos);
1197                 }
1198         }
1199 }