lustre/ldlm/ldlm_resource.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Whamcloud, Inc.
  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 <lustre_fid.h>
  50 #include <obd_class.h>
  51 #include "ldlm_internal.h"
  52
  53 cfs_mem_cache_t *ldlm_resource_slab, *ldlm_lock_slab;
  54
  55 cfs_atomic_t ldlm_srv_namespace_nr = CFS_ATOMIC_INIT(0);
  56 cfs_atomic_t ldlm_cli_namespace_nr = CFS_ATOMIC_INIT(0);
  57
  58 cfs_mutex_t ldlm_srv_namespace_lock;
  59 CFS_LIST_HEAD(ldlm_srv_namespace_list);
  60
  61 cfs_mutex_t ldlm_cli_namespace_lock;
  62 CFS_LIST_HEAD(ldlm_cli_namespace_list);
  63
  64 cfs_proc_dir_entry_t *ldlm_type_proc_dir = NULL;
  65 cfs_proc_dir_entry_t *ldlm_ns_proc_dir = NULL;
  66 cfs_proc_dir_entry_t *ldlm_svc_proc_dir = NULL;
  67
  68 extern unsigned int ldlm_cancel_unused_locks_before_replay;
  69
  70 /* during debug dump certain amount of granted locks for one resource to avoid
  71  * DDOS. */
  72 unsigned int ldlm_dump_granted_max = 256;
  73
  74 #ifdef LPROCFS
  75 static int ldlm_proc_dump_ns(struct file *file, const char *buffer,
  76                              unsigned long count, void *data)
  77 {
  78         ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
  79         ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
  80         RETURN(count);
  81 }
  82
  83 int ldlm_proc_setup(void)
  84 {
  85         int rc;
  86         struct lprocfs_vars list[] = {
  87                 { "dump_namespaces", NULL, ldlm_proc_dump_ns, NULL },
  88                 { "dump_granted_max",
  89                   lprocfs_rd_uint, lprocfs_wr_uint,
  90                   &ldlm_dump_granted_max, NULL },
  91                 { "cancel_unused_locks_before_replay",
  92                   lprocfs_rd_uint, lprocfs_wr_uint,
  93                   &ldlm_cancel_unused_locks_before_replay, NULL },
  94                 { NULL }};
  95         ENTRY;
  96         LASSERT(ldlm_ns_proc_dir == NULL);
  97
  98         ldlm_type_proc_dir = lprocfs_register(OBD_LDLM_DEVICENAME,
  99                                               proc_lustre_root,
 100                                               NULL, NULL);
 101         if (IS_ERR(ldlm_type_proc_dir)) {
 102                 CERROR("LProcFS failed in ldlm-init\n");
 103                 rc = PTR_ERR(ldlm_type_proc_dir);
 104                 GOTO(err, rc);
 105         }
 106
 107         ldlm_ns_proc_dir = lprocfs_register("namespaces",
 108                                             ldlm_type_proc_dir,
 109                                             NULL, NULL);
 110         if (IS_ERR(ldlm_ns_proc_dir)) {
 111                 CERROR("LProcFS failed in ldlm-init\n");
 112                 rc = PTR_ERR(ldlm_ns_proc_dir);
 113                 GOTO(err_type, rc);
 114         }
 115
 116         ldlm_svc_proc_dir = lprocfs_register("services",
 117                                             ldlm_type_proc_dir,
 118                                             NULL, NULL);
 119         if (IS_ERR(ldlm_svc_proc_dir)) {
 120                 CERROR("LProcFS failed in ldlm-init\n");
 121                 rc = PTR_ERR(ldlm_svc_proc_dir);
 122                 GOTO(err_ns, rc);
 123         }
 124
 125         rc = lprocfs_add_vars(ldlm_type_proc_dir, list, NULL);
 126
 127         RETURN(0);
 128
 129 err_ns:
 130         lprocfs_remove(&ldlm_ns_proc_dir);
 131 err_type:
 132         lprocfs_remove(&ldlm_type_proc_dir);
 133 err:
 134         ldlm_svc_proc_dir = NULL;
 135         RETURN(rc);
 136 }
 137
 138 void ldlm_proc_cleanup(void)
 139 {
 140         if (ldlm_svc_proc_dir)
 141                 lprocfs_remove(&ldlm_svc_proc_dir);
 142
 143         if (ldlm_ns_proc_dir)
 144                 lprocfs_remove(&ldlm_ns_proc_dir);
 145
 146         if (ldlm_type_proc_dir)
 147                 lprocfs_remove(&ldlm_type_proc_dir);
 148 }
 149
 150 static int lprocfs_rd_ns_resources(char *page, char **start, off_t off,
 151                                    int count, int *eof, void *data)
 152 {
 153         struct ldlm_namespace *ns  = data;
 154         __u64                  res = 0;
 155         cfs_hash_bd_t          bd;
 156         int                    i;
 157
 158         /* result is not strictly consistant */
 159         cfs_hash_for_each_bucket(ns->ns_rs_hash, &bd, i)
 160                 res += cfs_hash_bd_count_get(&bd);
 161         return lprocfs_rd_u64(page, start, off, count, eof, &res);
 162 }
 163
 164 static int lprocfs_rd_ns_locks(char *page, char **start, off_t off,
 165                                int count, int *eof, void *data)
 166 {
 167         struct ldlm_namespace *ns = data;
 168         __u64                  locks;
 169
 170         locks = lprocfs_stats_collector(ns->ns_stats, LDLM_NSS_LOCKS,
 171                                         LPROCFS_FIELDS_FLAGS_SUM);
 172         return lprocfs_rd_u64(page, start, off, count, eof, &locks);
 173 }
 174
 175 static int lprocfs_rd_lru_size(char *page, char **start, off_t off,
 176                                int count, int *eof, void *data)
 177 {
 178         struct ldlm_namespace *ns = data;
 179         __u32 *nr = &ns->ns_max_unused;
 180
 181         if (ns_connect_lru_resize(ns))
 182                 nr = &ns->ns_nr_unused;
 183         return lprocfs_rd_uint(page, start, off, count, eof, nr);
 184 }
 185
 186 static int lprocfs_wr_lru_size(struct file *file, const char *buffer,
 187                                unsigned long count, void *data)
 188 {
 189         struct ldlm_namespace *ns = data;
 190         char dummy[MAX_STRING_SIZE + 1], *end;
 191         unsigned long tmp;
 192         int lru_resize;
 193
 194         dummy[MAX_STRING_SIZE] = '\0';
 195         if (cfs_copy_from_user(dummy, buffer, MAX_STRING_SIZE))
 196                 return -EFAULT;
 197
 198         if (strncmp(dummy, "clear", 5) == 0) {
 199                 CDEBUG(D_DLMTRACE,
 200                        "dropping all unused locks from namespace %s\n",
 201                        ldlm_ns_name(ns));
 202                 if (ns_connect_lru_resize(ns)) {
 203                         int canceled, unused  = ns->ns_nr_unused;
 204
 205                         /* Try to cancel all @ns_nr_unused locks. */
 206                         canceled = ldlm_cancel_lru(ns, unused, LDLM_SYNC,
 207                                                    LDLM_CANCEL_PASSED);
 208                         if (canceled < unused) {
 209                                 CDEBUG(D_DLMTRACE,
 210                                        "not all requested locks are canceled, "
 211                                        "requested: %d, canceled: %d\n", unused,
 212                                        canceled);
 213                                 return -EINVAL;
 214                         }
 215                 } else {
 216                         tmp = ns->ns_max_unused;
 217                         ns->ns_max_unused = 0;
 218                         ldlm_cancel_lru(ns, 0, LDLM_SYNC, LDLM_CANCEL_PASSED);
 219                         ns->ns_max_unused = tmp;
 220                 }
 221                 return count;
 222         }
 223
 224         tmp = simple_strtoul(dummy, &end, 0);
 225         if (dummy == end) {
 226                 CERROR("invalid value written\n");
 227                 return -EINVAL;
 228         }
 229         lru_resize = (tmp == 0);
 230
 231         if (ns_connect_lru_resize(ns)) {
 232                 if (!lru_resize)
 233                         ns->ns_max_unused = (unsigned int)tmp;
 234
 235                 if (tmp > ns->ns_nr_unused)
 236                         tmp = ns->ns_nr_unused;
 237                 tmp = ns->ns_nr_unused - tmp;
 238
 239                 CDEBUG(D_DLMTRACE,
 240                        "changing namespace %s unused locks from %u to %u\n",
 241                        ldlm_ns_name(ns), ns->ns_nr_unused,
 242                        (unsigned int)tmp);
 243                 ldlm_cancel_lru(ns, tmp, LDLM_ASYNC, LDLM_CANCEL_PASSED);
 244
 245                 if (!lru_resize) {
 246                         CDEBUG(D_DLMTRACE,
 247                                "disable lru_resize for namespace %s\n",
 248                                ldlm_ns_name(ns));
 249                         ns->ns_connect_flags &= ~OBD_CONNECT_LRU_RESIZE;
 250                 }
 251         } else {
 252                 CDEBUG(D_DLMTRACE,
 253                        "changing namespace %s max_unused from %u to %u\n",
 254                        ldlm_ns_name(ns), ns->ns_max_unused,
 255                        (unsigned int)tmp);
 256                 ns->ns_max_unused = (unsigned int)tmp;
 257                 ldlm_cancel_lru(ns, 0, LDLM_ASYNC, LDLM_CANCEL_PASSED);
 258
 259                 /* Make sure that originally lru resize was supported before
 260                  * turning it on here. */
 261                 if (lru_resize &&
 262                     (ns->ns_orig_connect_flags & OBD_CONNECT_LRU_RESIZE)) {
 263                         CDEBUG(D_DLMTRACE,
 264                                "enable lru_resize for namespace %s\n",
 265                                ldlm_ns_name(ns));
 266                         ns->ns_connect_flags |= OBD_CONNECT_LRU_RESIZE;
 267                 }
 268         }
 269
 270         return count;
 271 }
 272
 273 void ldlm_namespace_proc_unregister(struct ldlm_namespace *ns)
 274 {
 275         struct proc_dir_entry *dir;
 276
 277         dir = lprocfs_srch(ldlm_ns_proc_dir, ldlm_ns_name(ns));
 278         if (dir == NULL) {
 279                 CERROR("dlm namespace %s has no procfs dir?\n",
 280                        ldlm_ns_name(ns));
 281         } else {
 282                 lprocfs_remove(&dir);
 283         }
 284
 285         if (ns->ns_stats != NULL)
 286                 lprocfs_free_stats(&ns->ns_stats);
 287 }
 288
 289 int ldlm_namespace_proc_register(struct ldlm_namespace *ns)
 290 {
 291         struct lprocfs_vars lock_vars[2];
 292         char lock_name[MAX_STRING_SIZE + 1];
 293
 294         LASSERT(ns != NULL);
 295         LASSERT(ns->ns_rs_hash != NULL);
 296
 297         ns->ns_stats = lprocfs_alloc_stats(LDLM_NSS_LAST, 0);
 298         if (ns->ns_stats == NULL)
 299                 return -ENOMEM;
 300
 301         lprocfs_counter_init(ns->ns_stats, LDLM_NSS_LOCKS,
 302                              LPROCFS_CNTR_AVGMINMAX, "locks", "locks");
 303
 304         lock_name[MAX_STRING_SIZE] = '\0';
 305
 306         memset(lock_vars, 0, sizeof(lock_vars));
 307         lock_vars[0].name = lock_name;
 308
 309         snprintf(lock_name, MAX_STRING_SIZE, "%s/resource_count",
 310                  ldlm_ns_name(ns));
 311         lock_vars[0].data = ns;
 312         lock_vars[0].read_fptr = lprocfs_rd_ns_resources;
 313         lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 314
 315         snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_count",
 316                  ldlm_ns_name(ns));
 317         lock_vars[0].data = ns;
 318         lock_vars[0].read_fptr = lprocfs_rd_ns_locks;
 319         lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 320
 321         if (ns_is_client(ns)) {
 322                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_unused_count",
 323                          ldlm_ns_name(ns));
 324                 lock_vars[0].data = &ns->ns_nr_unused;
 325                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 326                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 327
 328                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lru_size",
 329                          ldlm_ns_name(ns));
 330                 lock_vars[0].data = ns;
 331                 lock_vars[0].read_fptr = lprocfs_rd_lru_size;
 332                 lock_vars[0].write_fptr = lprocfs_wr_lru_size;
 333                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 334
 335                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lru_max_age",
 336                          ldlm_ns_name(ns));
 337                 lock_vars[0].data = &ns->ns_max_age;
 338                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 339                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 340                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 341         } else {
 342                 snprintf(lock_name, MAX_STRING_SIZE, "%s/ctime_age_limit",
 343                          ldlm_ns_name(ns));
 344                 lock_vars[0].data = &ns->ns_ctime_age_limit;
 345                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 346                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 347                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 348
 349                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_timeouts",
 350                          ldlm_ns_name(ns));
 351                 lock_vars[0].data = &ns->ns_timeouts;
 352                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 353                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 354
 355                 snprintf(lock_name, MAX_STRING_SIZE, "%s/max_nolock_bytes",
 356                          ldlm_ns_name(ns));
 357                 lock_vars[0].data = &ns->ns_max_nolock_size;
 358                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 359                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 360                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 361
 362                 snprintf(lock_name, MAX_STRING_SIZE, "%s/contention_seconds",
 363                          ldlm_ns_name(ns));
 364                 lock_vars[0].data = &ns->ns_contention_time;
 365                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 366                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 367                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 368
 369                 snprintf(lock_name, MAX_STRING_SIZE, "%s/contended_locks",
 370                          ldlm_ns_name(ns));
 371                 lock_vars[0].data = &ns->ns_contended_locks;
 372                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 373                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 374                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 375
 376                 snprintf(lock_name, MAX_STRING_SIZE, "%s/max_parallel_ast",
 377                          ldlm_ns_name(ns));
 378                 lock_vars[0].data = &ns->ns_max_parallel_ast;
 379                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 380                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 381                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 382         }
 383         return 0;
 384 }
 385 #undef MAX_STRING_SIZE
 386 #else /* LPROCFS */
 387
 388 #define ldlm_namespace_proc_unregister(ns)      ({;})
 389 #define ldlm_namespace_proc_register(ns)        ({0;})
 390
 391 #endif /* LPROCFS */
 392
 393 static unsigned ldlm_res_hop_hash(cfs_hash_t *hs,
 394                                   const void *key, unsigned mask)
 395 {
 396         const struct ldlm_res_id     *id  = key;
 397         unsigned                val = 0;
 398         unsigned                i;
 399
 400         for (i = 0; i < RES_NAME_SIZE; i++)
 401                 val += id->name[i];
 402         return val & mask;
 403 }
 404
 405 static unsigned ldlm_res_hop_fid_hash(cfs_hash_t *hs,
 406                                       const void *key, unsigned mask)
 407 {
 408         const struct ldlm_res_id *id = key;
 409         struct lu_fid       fid;
 410         __u32               hash;
 411         __u32               val;
 412
 413         fid.f_seq = id->name[LUSTRE_RES_ID_SEQ_OFF];
 414         fid.f_oid = (__u32)id->name[LUSTRE_RES_ID_VER_OID_OFF];
 415         fid.f_ver = (__u32)(id->name[LUSTRE_RES_ID_VER_OID_OFF] >> 32);
 416
 417         hash = fid_flatten32(&fid);
 418         hash += (hash >> 4) + (hash << 12); /* mixing oid and seq */
 419         if (id->name[LUSTRE_RES_ID_HSH_OFF] != 0) {
 420                 val = id->name[LUSTRE_RES_ID_HSH_OFF];
 421                 hash += (val >> 5) + (val << 11);
 422         } else {
 423                 val = fid_oid(&fid);
 424         }
 425         hash = cfs_hash_long(hash, hs->hs_bkt_bits);
 426         /* give me another random factor */
 427         hash -= cfs_hash_long((unsigned long)hs, val % 11 + 3);
 428
 429         hash <<= hs->hs_cur_bits - hs->hs_bkt_bits;
 430         hash |= ldlm_res_hop_hash(hs, key, CFS_HASH_NBKT(hs) - 1);
 431
 432         return hash & mask;
 433 }
 434
 435 static void *ldlm_res_hop_key(cfs_hlist_node_t *hnode)
 436 {
 437         struct ldlm_resource   *res;
 438
 439         res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 440         return &res->lr_name;
 441 }
 442
 443 static int ldlm_res_hop_keycmp(const void *key, cfs_hlist_node_t *hnode)
 444 {
 445         struct ldlm_resource   *res;
 446
 447         res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 448         return ldlm_res_eq((const struct ldlm_res_id *)key,
 449                            (const struct ldlm_res_id *)&res->lr_name);
 450 }
 451
 452 static void *ldlm_res_hop_object(cfs_hlist_node_t *hnode)
 453 {
 454         return cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 455 }
 456
 457 static void ldlm_res_hop_get_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
 458 {
 459         struct ldlm_resource *res;
 460
 461         res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 462         ldlm_resource_getref(res);
 463         LDLM_RESOURCE_ADDREF(res);
 464 }
 465
 466 static void ldlm_res_hop_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
 467 {
 468         struct ldlm_resource *res;
 469
 470         res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 471         /* cfs_hash_for_each_nolock is the only chance we call it */
 472         LDLM_RESOURCE_DELREF(res);
 473         ldlm_resource_putref_locked(res);
 474 }
 475
 476 static void ldlm_res_hop_put(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
 477 {
 478         struct ldlm_resource *res;
 479
 480         res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 481         LDLM_RESOURCE_DELREF(res);
 482         ldlm_resource_putref(res);
 483 }
 484
 485 cfs_hash_ops_t ldlm_ns_hash_ops = {
 486         .hs_hash        = ldlm_res_hop_hash,
 487         .hs_key         = ldlm_res_hop_key,
 488         .hs_keycmp      = ldlm_res_hop_keycmp,
 489         .hs_keycpy      = NULL,
 490         .hs_object      = ldlm_res_hop_object,
 491         .hs_get         = ldlm_res_hop_get_locked,
 492         .hs_put_locked  = ldlm_res_hop_put_locked,
 493         .hs_put         = ldlm_res_hop_put
 494 };
 495
 496 cfs_hash_ops_t ldlm_ns_fid_hash_ops = {
 497         .hs_hash        = ldlm_res_hop_fid_hash,
 498         .hs_key         = ldlm_res_hop_key,
 499         .hs_keycmp      = ldlm_res_hop_keycmp,
 500         .hs_keycpy      = NULL,
 501         .hs_object      = ldlm_res_hop_object,
 502         .hs_get         = ldlm_res_hop_get_locked,
 503         .hs_put_locked  = ldlm_res_hop_put_locked,
 504         .hs_put         = ldlm_res_hop_put
 505 };
 506
 507 typedef struct {
 508         ldlm_ns_type_t  nsd_type;
 509         /** hash bucket bits */
 510         unsigned        nsd_bkt_bits;
 511         /** hash bits */
 512         unsigned        nsd_all_bits;
 513         /** hash operations */
 514         cfs_hash_ops_t *nsd_hops;
 515 } ldlm_ns_hash_def_t;
 516
 517 ldlm_ns_hash_def_t ldlm_ns_hash_defs[] =
 518 {
 519         {
 520                 .nsd_type       = LDLM_NS_TYPE_MDC,
 521                 .nsd_bkt_bits   = 11,
 522                 .nsd_all_bits   = 16,
 523                 .nsd_hops       = &ldlm_ns_fid_hash_ops,
 524         },
 525         {
 526                 .nsd_type       = LDLM_NS_TYPE_MDT,
 527                 .nsd_bkt_bits   = 14,
 528                 .nsd_all_bits   = 21,
 529                 .nsd_hops       = &ldlm_ns_fid_hash_ops,
 530         },
 531         {
 532                 .nsd_type       = LDLM_NS_TYPE_OSC,
 533                 .nsd_bkt_bits   = 8,
 534                 .nsd_all_bits   = 12,
 535                 .nsd_hops       = &ldlm_ns_hash_ops,
 536         },
 537         {
 538                 .nsd_type       = LDLM_NS_TYPE_OST,
 539                 .nsd_bkt_bits   = 11,
 540                 .nsd_all_bits   = 17,
 541                 .nsd_hops       = &ldlm_ns_hash_ops,
 542         },
 543         {
 544                 .nsd_type       = LDLM_NS_TYPE_MGC,
 545                 .nsd_bkt_bits   = 4,
 546                 .nsd_all_bits   = 4,
 547                 .nsd_hops       = &ldlm_ns_hash_ops,
 548         },
 549         {
 550                 .nsd_type       = LDLM_NS_TYPE_MGT,
 551                 .nsd_bkt_bits   = 4,
 552                 .nsd_all_bits   = 4,
 553                 .nsd_hops       = &ldlm_ns_hash_ops,
 554         },
 555         {
 556                 .nsd_type       = LDLM_NS_TYPE_UNKNOWN,
 557         },
 558 };
 559
 560 struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
 561                                           ldlm_side_t client,
 562                                           ldlm_appetite_t apt,
 563                                           ldlm_ns_type_t ns_type)
 564 {
 565         struct ldlm_namespace *ns = NULL;
 566         struct ldlm_ns_bucket *nsb;
 567         ldlm_ns_hash_def_t    *nsd;
 568         cfs_hash_bd_t          bd;
 569         int                    idx;
 570         int                    rc;
 571         ENTRY;
 572
 573         LASSERT(obd != NULL);
 574
 575         rc = ldlm_get_ref();
 576         if (rc) {
 577                 CERROR("ldlm_get_ref failed: %d\n", rc);
 578                 RETURN(NULL);
 579         }
 580
 581         for (idx = 0;;idx++) {
 582                 nsd = &ldlm_ns_hash_defs[idx];
 583                 if (nsd->nsd_type == LDLM_NS_TYPE_UNKNOWN) {
 584                         CERROR("Unknown type %d for ns %s\n", ns_type, name);
 585                         GOTO(out_ref, NULL);
 586                 }
 587
 588                 if (nsd->nsd_type == ns_type)
 589                         break;
 590         }
 591
 592         OBD_ALLOC_PTR(ns);
 593         if (!ns)
 594                 GOTO(out_ref, NULL);
 595
 596         ns->ns_rs_hash = cfs_hash_create(name,
 597                                          nsd->nsd_all_bits, nsd->nsd_all_bits,
 598                                          nsd->nsd_bkt_bits, sizeof(*nsb),
 599                                          CFS_HASH_MIN_THETA,
 600                                          CFS_HASH_MAX_THETA,
 601                                          nsd->nsd_hops,
 602                                          CFS_HASH_DEPTH |
 603                                          CFS_HASH_BIGNAME |
 604                                          CFS_HASH_SPIN_BKTLOCK |
 605                                          CFS_HASH_NO_ITEMREF);
 606         if (ns->ns_rs_hash == NULL)
 607                 GOTO(out_ns, NULL);
 608
 609         cfs_hash_for_each_bucket(ns->ns_rs_hash, &bd, idx) {
 610                 nsb = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
 611                 at_init(&nsb->nsb_at_estimate, ldlm_enqueue_min, 0);
 612                 nsb->nsb_namespace = ns;
 613         }
 614
 615         ns->ns_obd      = obd;
 616         ns->ns_appetite = apt;
 617         ns->ns_client   = client;
 618
 619         CFS_INIT_LIST_HEAD(&ns->ns_list_chain);
 620         CFS_INIT_LIST_HEAD(&ns->ns_unused_list);
 621         cfs_spin_lock_init(&ns->ns_lock);
 622         cfs_atomic_set(&ns->ns_bref, 0);
 623         cfs_waitq_init(&ns->ns_waitq);
 624
 625         ns->ns_max_nolock_size    = NS_DEFAULT_MAX_NOLOCK_BYTES;
 626         ns->ns_contention_time    = NS_DEFAULT_CONTENTION_SECONDS;
 627         ns->ns_contended_locks    = NS_DEFAULT_CONTENDED_LOCKS;
 628
 629         ns->ns_max_parallel_ast   = LDLM_DEFAULT_PARALLEL_AST_LIMIT;
 630         ns->ns_nr_unused          = 0;
 631         ns->ns_max_unused         = LDLM_DEFAULT_LRU_SIZE;
 632         ns->ns_max_age            = LDLM_DEFAULT_MAX_ALIVE;
 633         ns->ns_ctime_age_limit    = LDLM_CTIME_AGE_LIMIT;
 634         ns->ns_timeouts           = 0;
 635         ns->ns_orig_connect_flags = 0;
 636         ns->ns_connect_flags      = 0;
 637         ns->ns_stopping           = 0;
 638         rc = ldlm_namespace_proc_register(ns);
 639         if (rc != 0) {
 640                 CERROR("Can't initialize ns proc, rc %d\n", rc);
 641                 GOTO(out_hash, rc);
 642         }
 643
 644         idx = cfs_atomic_read(ldlm_namespace_nr(client));
 645         rc = ldlm_pool_init(&ns->ns_pool, ns, idx, client);
 646         if (rc) {
 647                 CERROR("Can't initialize lock pool, rc %d\n", rc);
 648                 GOTO(out_proc, rc);
 649         }
 650
 651         ldlm_namespace_register(ns, client);
 652         RETURN(ns);
 653 out_proc:
 654         ldlm_namespace_proc_unregister(ns);
 655         ldlm_namespace_cleanup(ns, 0);
 656 out_hash:
 657         cfs_hash_putref(ns->ns_rs_hash);
 658 out_ns:
 659         OBD_FREE_PTR(ns);
 660 out_ref:
 661         ldlm_put_ref();
 662         RETURN(NULL);
 663 }
 664
 665 extern struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
 666
 667 /* If flags contains FL_LOCAL_ONLY, don't try to tell the server, just cleanup.
 668  * This is currently only used for recovery, and we make certain assumptions
 669  * as a result--notably, that we shouldn't cancel locks with refs. -phil */
 670 static void cleanup_resource(struct ldlm_resource *res, cfs_list_t *q,
 671                              int flags)
 672 {
 673         cfs_list_t *tmp;
 674         int rc = 0, client = ns_is_client(ldlm_res_to_ns(res));
 675         int local_only = (flags & LDLM_FL_LOCAL_ONLY);
 676
 677         do {
 678                 struct ldlm_lock *lock = NULL;
 679
 680                 /* first, we look for non-cleaned-yet lock
 681                  * all cleaned locks are marked by CLEANED flag */
 682                 lock_res(res);
 683                 cfs_list_for_each(tmp, q) {
 684                         lock = cfs_list_entry(tmp, struct ldlm_lock,
 685                                               l_res_link);
 686                         if (lock->l_flags & LDLM_FL_CLEANED) {
 687                                 lock = NULL;
 688                                 continue;
 689                         }
 690                         LDLM_LOCK_GET(lock);
 691                         lock->l_flags |= LDLM_FL_CLEANED;
 692                         break;
 693                 }
 694
 695                 if (lock == NULL) {
 696                         unlock_res(res);
 697                         break;
 698                 }
 699
 700                 /* Set CBPENDING so nothing in the cancellation path
 701                  * can match this lock */
 702                 lock->l_flags |= LDLM_FL_CBPENDING;
 703                 lock->l_flags |= LDLM_FL_FAILED;
 704                 lock->l_flags |= flags;
 705
 706                 /* ... without sending a CANCEL message for local_only. */
 707                 if (local_only)
 708                         lock->l_flags |= LDLM_FL_LOCAL_ONLY;
 709
 710                 if (local_only && (lock->l_readers || lock->l_writers)) {
 711                         /* This is a little bit gross, but much better than the
 712                          * alternative: pretend that we got a blocking AST from
 713                          * the server, so that when the lock is decref'd, it
 714                          * will go away ... */
 715                         unlock_res(res);
 716                         LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
 717                         if (lock->l_completion_ast)
 718                                 lock->l_completion_ast(lock, 0, NULL);
 719                         LDLM_LOCK_RELEASE(lock);
 720                         continue;
 721                 }
 722
 723                 if (client) {
 724                         struct lustre_handle lockh;
 725
 726                         unlock_res(res);
 727                         ldlm_lock2handle(lock, &lockh);
 728                         rc = ldlm_cli_cancel(&lockh);
 729                         if (rc)
 730                                 CERROR("ldlm_cli_cancel: %d\n", rc);
 731                 } else {
 732                         ldlm_resource_unlink_lock(lock);
 733                         unlock_res(res);
 734                         LDLM_DEBUG(lock, "Freeing a lock still held by a "
 735                                    "client node");
 736                         ldlm_lock_destroy(lock);
 737                 }
 738                 LDLM_LOCK_RELEASE(lock);
 739         } while (1);
 740 }
 741
 742 static int ldlm_resource_clean(cfs_hash_t *hs, cfs_hash_bd_t *bd,
 743                                cfs_hlist_node_t *hnode, void *arg)
 744 {
 745         struct ldlm_resource *res = cfs_hash_object(hs, hnode);
 746         int    flags = (int)(unsigned long)arg;
 747
 748         cleanup_resource(res, &res->lr_granted, flags);
 749         cleanup_resource(res, &res->lr_converting, flags);
 750         cleanup_resource(res, &res->lr_waiting, flags);
 751
 752         return 0;
 753 }
 754
 755 static int ldlm_resource_complain(cfs_hash_t *hs, cfs_hash_bd_t *bd,
 756                                   cfs_hlist_node_t *hnode, void *arg)
 757 {
 758         struct ldlm_resource  *res = cfs_hash_object(hs, hnode);
 759
 760         CERROR("Namespace %s resource refcount nonzero "
 761                "(%d) after lock cleanup; forcing "
 762                "cleanup.\n",
 763                ldlm_ns_name(ldlm_res_to_ns(res)),
 764                cfs_atomic_read(&res->lr_refcount) - 1);
 765
 766         CERROR("Resource: %p ("LPU64"/"LPU64"/"LPU64"/"
 767                LPU64") (rc: %d)\n", res,
 768                res->lr_name.name[0], res->lr_name.name[1],
 769                res->lr_name.name[2], res->lr_name.name[3],
 770                cfs_atomic_read(&res->lr_refcount) - 1);
 771         return 0;
 772 }
 773
 774 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, int flags)
 775 {
 776         if (ns == NULL) {
 777                 CDEBUG(D_INFO, "NULL ns, skipping cleanup\n");
 778                 return ELDLM_OK;
 779         }
 780
 781         cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_clean,
 782                                  (void *)(unsigned long)flags);
 783         cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_complain, NULL);
 784         return ELDLM_OK;
 785 }
 786
 787 static int __ldlm_namespace_free(struct ldlm_namespace *ns, int force)
 788 {
 789         ENTRY;
 790
 791         /* At shutdown time, don't call the cancellation callback */
 792         ldlm_namespace_cleanup(ns, force ? LDLM_FL_LOCAL_ONLY : 0);
 793
 794         if (cfs_atomic_read(&ns->ns_bref) > 0) {
 795                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 796                 int rc;
 797                 CDEBUG(D_DLMTRACE,
 798                        "dlm namespace %s free waiting on refcount %d\n",
 799                        ldlm_ns_name(ns), cfs_atomic_read(&ns->ns_bref));
 800 force_wait:
 801                 if (force)
 802                         lwi = LWI_TIMEOUT(obd_timeout * CFS_HZ / 4, NULL, NULL);
 803
 804                 rc = l_wait_event(ns->ns_waitq,
 805                                   cfs_atomic_read(&ns->ns_bref) == 0, &lwi);
 806
 807                 /* Forced cleanups should be able to reclaim all references,
 808                  * so it's safe to wait forever... we can't leak locks... */
 809                 if (force && rc == -ETIMEDOUT) {
 810                         LCONSOLE_ERROR("Forced cleanup waiting for %s "
 811                                        "namespace with %d resources in use, "
 812                                        "(rc=%d)\n", ldlm_ns_name(ns),
 813                                        cfs_atomic_read(&ns->ns_bref), rc);
 814                         GOTO(force_wait, rc);
 815                 }
 816
 817                 if (cfs_atomic_read(&ns->ns_bref)) {
 818                         LCONSOLE_ERROR("Cleanup waiting for %s namespace "
 819                                        "with %d resources in use, (rc=%d)\n",
 820                                        ldlm_ns_name(ns),
 821                                        cfs_atomic_read(&ns->ns_bref), rc);
 822                         RETURN(ELDLM_NAMESPACE_EXISTS);
 823                 }
 824                 CDEBUG(D_DLMTRACE, "dlm namespace %s free done waiting\n",
 825                        ldlm_ns_name(ns));
 826         }
 827
 828         RETURN(ELDLM_OK);
 829 }
 830
 831 /**
 832  * Performs various cleanups for passed \a ns to make it drop refc and be ready
 833  * for freeing. Waits for refc == 0.
 834  *
 835  * The following is done:
 836  * (0) Unregister \a ns from its list to make inaccessible for potential users
 837  * like pools thread and others;
 838  * (1) Clear all locks in \a ns.
 839  */
 840 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
 841                                struct obd_import *imp,
 842                                int force)
 843 {
 844         int rc;
 845         ENTRY;
 846         if (!ns) {
 847                 EXIT;
 848                 return;
 849         }
 850
 851         cfs_spin_lock(&ns->ns_lock);
 852         ns->ns_stopping = 1;
 853         cfs_spin_unlock(&ns->ns_lock);
 854
 855         /*
 856          * Can fail with -EINTR when force == 0 in which case try harder.
 857          */
 858         rc = __ldlm_namespace_free(ns, force);
 859         if (rc != ELDLM_OK) {
 860                 if (imp) {
 861                         ptlrpc_disconnect_import(imp, 0);
 862                         ptlrpc_invalidate_import(imp);
 863                 }
 864
 865                 /*
 866                  * With all requests dropped and the import inactive
 867                  * we are gaurenteed all reference will be dropped.
 868                  */
 869                 rc = __ldlm_namespace_free(ns, 1);
 870                 LASSERT(rc == 0);
 871         }
 872         EXIT;
 873 }
 874
 875 /**
 876  * Performs freeing memory structures related to \a ns. This is only done when
 877  * ldlm_namespce_free_prior() successfully removed all resources referencing
 878  * \a ns and its refc == 0.
 879  */
 880 void ldlm_namespace_free_post(struct ldlm_namespace *ns)
 881 {
 882         ENTRY;
 883         if (!ns) {
 884                 EXIT;
 885                 return;
 886         }
 887
 888
 889         /*
 890          * Make sure that nobody can find this ns in its list.
 891          */
 892         ldlm_namespace_unregister(ns, ns->ns_client);
 893         /*
 894          * Fini pool _before_ parent proc dir is removed. This is important as
 895          * ldlm_pool_fini() removes own proc dir which is child to @dir. Removing
 896          * it after @dir may cause oops.
 897          */
 898         ldlm_pool_fini(&ns->ns_pool);
 899
 900         ldlm_namespace_proc_unregister(ns);
 901         cfs_hash_putref(ns->ns_rs_hash);
 902         /*
 903          * Namespace \a ns should be not on list in this time, otherwise this
 904          * will cause issues realted to using freed \a ns in pools thread.
 905          */
 906         LASSERT(cfs_list_empty(&ns->ns_list_chain));
 907         OBD_FREE_PTR(ns);
 908         ldlm_put_ref();
 909         EXIT;
 910 }
 911
 912
 913 /* Cleanup the resource, and free namespace.
 914  * bug 12864:
 915  * Deadlock issue:
 916  * proc1: destroy import
 917  *        class_disconnect_export(grab cl_sem) ->
 918  *              -> ldlm_namespace_free ->
 919  *              -> lprocfs_remove(grab _lprocfs_lock).
 920  * proc2: read proc info
 921  *        lprocfs_fops_read(grab _lprocfs_lock) ->
 922  *              -> osc_rd_active, etc(grab cl_sem).
 923  *
 924  * So that I have to split the ldlm_namespace_free into two parts - the first
 925  * part ldlm_namespace_free_prior is used to cleanup the resource which is
 926  * being used; the 2nd part ldlm_namespace_free_post is used to unregister the
 927  * lprocfs entries, and then free memory. It will be called w/o cli->cl_sem
 928  * held.
 929  */
 930 void ldlm_namespace_free(struct ldlm_namespace *ns,
 931                          struct obd_import *imp,
 932                          int force)
 933 {
 934         ldlm_namespace_free_prior(ns, imp, force);
 935         ldlm_namespace_free_post(ns);
 936 }
 937
 938 void ldlm_namespace_get(struct ldlm_namespace *ns)
 939 {
 940         cfs_atomic_inc(&ns->ns_bref);
 941 }
 942
 943 void ldlm_namespace_put(struct ldlm_namespace *ns)
 944 {
 945         if (cfs_atomic_dec_and_lock(&ns->ns_bref, &ns->ns_lock)) {
 946                 cfs_waitq_signal(&ns->ns_waitq);
 947                 cfs_spin_unlock(&ns->ns_lock);
 948         }
 949 }
 950
 951 /* Register @ns in the list of namespaces */
 952 void ldlm_namespace_register(struct ldlm_namespace *ns, ldlm_side_t client)
 953 {
 954         cfs_mutex_lock(ldlm_namespace_lock(client));
 955         LASSERT(cfs_list_empty(&ns->ns_list_chain));
 956         cfs_list_add(&ns->ns_list_chain, ldlm_namespace_list(client));
 957         cfs_atomic_inc(ldlm_namespace_nr(client));
 958         cfs_mutex_unlock(ldlm_namespace_lock(client));
 959 }
 960
 961 /* Unregister @ns from the list of namespaces */
 962 void ldlm_namespace_unregister(struct ldlm_namespace *ns, ldlm_side_t client)
 963 {
 964         cfs_mutex_lock(ldlm_namespace_lock(client));
 965         LASSERT(!cfs_list_empty(&ns->ns_list_chain));
 966         /*
 967          * Some asserts and possibly other parts of code still using
 968          * list_empty(&ns->ns_list_chain). This is why it is important
 969          * to use list_del_init() here.
 970          */
 971         cfs_list_del_init(&ns->ns_list_chain);
 972         cfs_atomic_dec(ldlm_namespace_nr(client));
 973         cfs_mutex_unlock(ldlm_namespace_lock(client));
 974 }
 975
 976 /* Should be called under ldlm_namespace_lock(client) taken */
 977 void ldlm_namespace_move_locked(struct ldlm_namespace *ns, ldlm_side_t client)
 978 {
 979         LASSERT(!cfs_list_empty(&ns->ns_list_chain));
 980         LASSERT_MUTEX_LOCKED(ldlm_namespace_lock(client));
 981         cfs_list_move_tail(&ns->ns_list_chain, ldlm_namespace_list(client));
 982 }
 983
 984 /* Should be called under ldlm_namespace_lock(client) taken */
 985 struct ldlm_namespace *ldlm_namespace_first_locked(ldlm_side_t client)
 986 {
 987         LASSERT_MUTEX_LOCKED(ldlm_namespace_lock(client));
 988         LASSERT(!cfs_list_empty(ldlm_namespace_list(client)));
 989         return container_of(ldlm_namespace_list(client)->next,
 990                 struct ldlm_namespace, ns_list_chain);
 991 }
 992
 993 static struct ldlm_resource *ldlm_resource_new(void)
 994 {
 995         struct ldlm_resource *res;
 996         int idx;
 997
 998         OBD_SLAB_ALLOC_PTR_GFP(res, ldlm_resource_slab, CFS_ALLOC_IO);
 999         if (res == NULL)
1000                 return NULL;
1001
1002         CFS_INIT_LIST_HEAD(&res->lr_granted);
1003         CFS_INIT_LIST_HEAD(&res->lr_converting);
1004         CFS_INIT_LIST_HEAD(&res->lr_waiting);
1005
1006         /* initialize interval trees for each lock mode*/
1007         for (idx = 0; idx < LCK_MODE_NUM; idx++) {
1008                 res->lr_itree[idx].lit_size = 0;
1009                 res->lr_itree[idx].lit_mode = 1 << idx;
1010                 res->lr_itree[idx].lit_root = NULL;
1011         }
1012
1013         cfs_atomic_set(&res->lr_refcount, 1);
1014         cfs_spin_lock_init(&res->lr_lock);
1015         lu_ref_init(&res->lr_reference);
1016
1017         /* one who creates the resource must unlock
1018          * the mutex after lvb initialization */
1019         cfs_mutex_init(&res->lr_lvb_mutex);
1020         cfs_mutex_lock(&res->lr_lvb_mutex);
1021
1022         return res;
1023 }
1024
1025 /* Args: unlocked namespace
1026  *  * Locks: takes and releases NS hash-lock and res->lr_lock
1027  *   * Returns: referenced, unlocked ldlm_resource or NULL */
1028 struct ldlm_resource *
1029 ldlm_resource_get(struct ldlm_namespace *ns, struct ldlm_resource *parent,
1030                   const struct ldlm_res_id *name, ldlm_type_t type, int create)
1031 {
1032         cfs_hlist_node_t     *hnode;
1033         struct ldlm_resource *res;
1034         cfs_hash_bd_t         bd;
1035         __u64                 version;
1036
1037         LASSERT(ns != NULL);
1038         LASSERT(parent == NULL);
1039         LASSERT(ns->ns_rs_hash != NULL);
1040         LASSERT(name->name[0] != 0);
1041
1042         cfs_hash_bd_get_and_lock(ns->ns_rs_hash, (void *)name, &bd, 0);
1043         hnode = cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1044         if (hnode != NULL) {
1045                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1046                 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
1047                 /* synchronize WRT resource creation */
1048                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1049                         cfs_mutex_lock(&res->lr_lvb_mutex);
1050                         cfs_mutex_unlock(&res->lr_lvb_mutex);
1051                 }
1052                 return res;
1053         }
1054
1055         version = cfs_hash_bd_version_get(&bd);
1056         cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1057
1058         if (create == 0)
1059                 return NULL;
1060
1061         LASSERTF(type >= LDLM_MIN_TYPE && type < LDLM_MAX_TYPE,
1062                  "type: %d\n", type);
1063         res = ldlm_resource_new();
1064         if (!res)
1065                 return NULL;
1066
1067         res->lr_ns_bucket  = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
1068         res->lr_name       = *name;
1069         res->lr_type       = type;
1070         res->lr_most_restr = LCK_NL;
1071
1072         cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
1073         hnode = (version == cfs_hash_bd_version_get(&bd)) ?  NULL :
1074                 cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1075
1076         if (hnode != NULL) {
1077                 /* someone won the race and added the resource before */
1078                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1079                 /* clean lu_ref for failed resource */
1080                 lu_ref_fini(&res->lr_reference);
1081                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1082
1083                 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
1084                 /* synchronize WRT resource creation */
1085                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1086                         cfs_mutex_lock(&res->lr_lvb_mutex);
1087                         cfs_mutex_unlock(&res->lr_lvb_mutex);
1088                 }
1089                 return res;
1090         }
1091         /* we won! let's add the resource */
1092         cfs_hash_bd_add_locked(ns->ns_rs_hash, &bd, &res->lr_hash);
1093         if (cfs_hash_bd_count_get(&bd) == 1)
1094                 ldlm_namespace_get(ns);
1095
1096         cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1097         if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1098                 int rc;
1099
1100                 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CREATE_RESOURCE, 2);
1101                 rc = ns->ns_lvbo->lvbo_init(res);
1102                 if (rc)
1103                         CERROR("lvbo_init failed for resource "
1104                                LPU64": rc %d\n", name->name[0], rc);
1105                 /* we create resource with locked lr_lvb_mutex */
1106                 cfs_mutex_unlock(&res->lr_lvb_mutex);
1107         }
1108
1109         return res;
1110 }
1111
1112 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res)
1113 {
1114         LASSERT(res != NULL);
1115         LASSERT(res != LP_POISON);
1116         cfs_atomic_inc(&res->lr_refcount);
1117         CDEBUG(D_INFO, "getref res: %p count: %d\n", res,
1118                cfs_atomic_read(&res->lr_refcount));
1119         return res;
1120 }
1121
1122 static void __ldlm_resource_putref_final(cfs_hash_bd_t *bd,
1123                                          struct ldlm_resource *res)
1124 {
1125         struct ldlm_ns_bucket *nsb = res->lr_ns_bucket;
1126
1127         if (!cfs_list_empty(&res->lr_granted)) {
1128                 ldlm_resource_dump(D_ERROR, res);
1129                 LBUG();
1130         }
1131
1132         if (!cfs_list_empty(&res->lr_converting)) {
1133                 ldlm_resource_dump(D_ERROR, res);
1134                 LBUG();
1135         }
1136
1137         if (!cfs_list_empty(&res->lr_waiting)) {
1138                 ldlm_resource_dump(D_ERROR, res);
1139                 LBUG();
1140         }
1141
1142         cfs_hash_bd_del_locked(nsb->nsb_namespace->ns_rs_hash,
1143                                bd, &res->lr_hash);
1144         lu_ref_fini(&res->lr_reference);
1145         if (cfs_hash_bd_count_get(bd) == 0)
1146                 ldlm_namespace_put(nsb->nsb_namespace);
1147 }
1148
1149 /* Returns 1 if the resource was freed, 0 if it remains. */
1150 int ldlm_resource_putref(struct ldlm_resource *res)
1151 {
1152         struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1153         cfs_hash_bd_t   bd;
1154
1155         LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
1156         CDEBUG(D_INFO, "putref res: %p count: %d\n",
1157                res, cfs_atomic_read(&res->lr_refcount) - 1);
1158
1159         cfs_hash_bd_get(ns->ns_rs_hash, &res->lr_name, &bd);
1160         if (cfs_hash_bd_dec_and_lock(ns->ns_rs_hash, &bd, &res->lr_refcount)) {
1161                 __ldlm_resource_putref_final(&bd, res);
1162                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1163                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
1164                         ns->ns_lvbo->lvbo_free(res);
1165                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1166                 return 1;
1167         }
1168         return 0;
1169 }
1170
1171 /* Returns 1 if the resource was freed, 0 if it remains. */
1172 int ldlm_resource_putref_locked(struct ldlm_resource *res)
1173 {
1174         struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1175
1176         LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
1177         CDEBUG(D_INFO, "putref res: %p count: %d\n",
1178                res, cfs_atomic_read(&res->lr_refcount) - 1);
1179
1180         if (cfs_atomic_dec_and_test(&res->lr_refcount)) {
1181                 cfs_hash_bd_t bd;
1182
1183                 cfs_hash_bd_get(ldlm_res_to_ns(res)->ns_rs_hash,
1184                                 &res->lr_name, &bd);
1185                 __ldlm_resource_putref_final(&bd, res);
1186                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1187                 /* NB: ns_rs_hash is created with CFS_HASH_NO_ITEMREF,
1188                  * so we should never be here while calling cfs_hash_del,
1189                  * cfs_hash_for_each_nolock is the only case we can get
1190                  * here, which is safe to release cfs_hash_bd_lock.
1191                  */
1192                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
1193                         ns->ns_lvbo->lvbo_free(res);
1194                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1195
1196                 cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
1197                 return 1;
1198         }
1199         return 0;
1200 }
1201
1202 void ldlm_resource_add_lock(struct ldlm_resource *res, cfs_list_t *head,
1203                             struct ldlm_lock *lock)
1204 {
1205         check_res_locked(res);
1206
1207         LDLM_DEBUG(lock, "About to add this lock:\n");
1208
1209         if (lock->l_destroyed) {
1210                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1211                 return;
1212         }
1213
1214         LASSERT(cfs_list_empty(&lock->l_res_link));
1215
1216         cfs_list_add_tail(&lock->l_res_link, head);
1217 }
1218
1219 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
1220                                      struct ldlm_lock *new)
1221 {
1222         struct ldlm_resource *res = original->l_resource;
1223
1224         check_res_locked(res);
1225
1226         ldlm_resource_dump(D_INFO, res);
1227         LDLM_DEBUG(new, "About to insert this lock after %p:\n", original);
1228
1229         if (new->l_destroyed) {
1230                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1231                 goto out;
1232         }
1233
1234         LASSERT(cfs_list_empty(&new->l_res_link));
1235
1236         cfs_list_add(&new->l_res_link, &original->l_res_link);
1237  out:;
1238 }
1239
1240 void ldlm_resource_unlink_lock(struct ldlm_lock *lock)
1241 {
1242         int type = lock->l_resource->lr_type;
1243
1244         check_res_locked(lock->l_resource);
1245         if (type == LDLM_IBITS || type == LDLM_PLAIN)
1246                 ldlm_unlink_lock_skiplist(lock);
1247         else if (type == LDLM_EXTENT)
1248                 ldlm_extent_unlink_lock(lock);
1249         cfs_list_del_init(&lock->l_res_link);
1250 }
1251
1252 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc)
1253 {
1254         desc->lr_type = res->lr_type;
1255         desc->lr_name = res->lr_name;
1256 }
1257
1258 void ldlm_dump_all_namespaces(ldlm_side_t client, int level)
1259 {
1260         cfs_list_t *tmp;
1261
1262         if (!((libcfs_debug | D_ERROR) & level))
1263                 return;
1264
1265         cfs_mutex_lock(ldlm_namespace_lock(client));
1266
1267         cfs_list_for_each(tmp, ldlm_namespace_list(client)) {
1268                 struct ldlm_namespace *ns;
1269                 ns = cfs_list_entry(tmp, struct ldlm_namespace, ns_list_chain);
1270                 ldlm_namespace_dump(level, ns);
1271         }
1272
1273         cfs_mutex_unlock(ldlm_namespace_lock(client));
1274 }
1275
1276 static int ldlm_res_hash_dump(cfs_hash_t *hs, cfs_hash_bd_t *bd,
1277                               cfs_hlist_node_t *hnode, void *arg)
1278 {
1279         struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1280         int    level = (int)(unsigned long)arg;
1281
1282         lock_res(res);
1283         ldlm_resource_dump(level, res);
1284         unlock_res(res);
1285
1286         return 0;
1287 }
1288
1289 void ldlm_namespace_dump(int level, struct ldlm_namespace *ns)
1290 {
1291         if (!((libcfs_debug | D_ERROR) & level))
1292                 return;
1293
1294         CDEBUG(level, "--- Namespace: %s (rc: %d, side: %s)\n",
1295                ldlm_ns_name(ns), cfs_atomic_read(&ns->ns_bref),
1296                ns_is_client(ns) ? "client" : "server");
1297
1298         if (cfs_time_before(cfs_time_current(), ns->ns_next_dump))
1299                 return;
1300
1301         cfs_hash_for_each_nolock(ns->ns_rs_hash,
1302                                  ldlm_res_hash_dump,
1303                                  (void *)(unsigned long)level);
1304         cfs_spin_lock(&ns->ns_lock);
1305         ns->ns_next_dump = cfs_time_shift(10);
1306         cfs_spin_unlock(&ns->ns_lock);
1307 }
1308
1309 void ldlm_resource_dump(int level, struct ldlm_resource *res)
1310 {
1311         struct ldlm_lock *lock;
1312         unsigned int granted = 0;
1313
1314         CLASSERT(RES_NAME_SIZE == 4);
1315
1316         if (!((libcfs_debug | D_ERROR) & level))
1317                 return;
1318
1319         CDEBUG(level, "--- Resource: %p ("LPU64"/"LPU64"/"LPU64"/"LPU64
1320                ") (rc: %d)\n", res, res->lr_name.name[0], res->lr_name.name[1],
1321                res->lr_name.name[2], res->lr_name.name[3],
1322                cfs_atomic_read(&res->lr_refcount));
1323
1324         if (!cfs_list_empty(&res->lr_granted)) {
1325                 CDEBUG(level, "Granted locks (in reverse order):\n");
1326                 cfs_list_for_each_entry_reverse(lock, &res->lr_granted,
1327                                                 l_res_link) {
1328                         LDLM_DEBUG_LIMIT(level, lock, "###");
1329                         if (!(level & D_CANTMASK) &&
1330                             ++granted > ldlm_dump_granted_max) {
1331                                 CDEBUG(level, "only dump %d granted locks to "
1332                                        "avoid DDOS.\n", granted);
1333                                 break;
1334                         }
1335                 }
1336         }
1337         if (!cfs_list_empty(&res->lr_converting)) {
1338                 CDEBUG(level, "Converting locks:\n");
1339                 cfs_list_for_each_entry(lock, &res->lr_converting, l_res_link)
1340                         LDLM_DEBUG_LIMIT(level, lock, "###");
1341         }
1342         if (!cfs_list_empty(&res->lr_waiting)) {
1343                 CDEBUG(level, "Waiting locks:\n");
1344                 cfs_list_for_each_entry(lock, &res->lr_waiting, l_res_link)
1345                         LDLM_DEBUG_LIMIT(level, lock, "###");
1346         }
1347 }