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 }
 464
 465 static void ldlm_res_hop_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
 466 {
 467         struct ldlm_resource *res;
 468
 469         res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 470         /* cfs_hash_for_each_nolock is the only chance we call it */
 471         ldlm_resource_putref_locked(res);
 472 }
 473
 474 static void ldlm_res_hop_put(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
 475 {
 476         struct ldlm_resource *res;
 477
 478         res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 479         ldlm_resource_putref(res);
 480 }
 481
 482 cfs_hash_ops_t ldlm_ns_hash_ops = {
 483         .hs_hash        = ldlm_res_hop_hash,
 484         .hs_key         = ldlm_res_hop_key,
 485         .hs_keycmp      = ldlm_res_hop_keycmp,
 486         .hs_keycpy      = NULL,
 487         .hs_object      = ldlm_res_hop_object,
 488         .hs_get         = ldlm_res_hop_get_locked,
 489         .hs_put_locked  = ldlm_res_hop_put_locked,
 490         .hs_put         = ldlm_res_hop_put
 491 };
 492
 493 cfs_hash_ops_t ldlm_ns_fid_hash_ops = {
 494         .hs_hash        = ldlm_res_hop_fid_hash,
 495         .hs_key         = ldlm_res_hop_key,
 496         .hs_keycmp      = ldlm_res_hop_keycmp,
 497         .hs_keycpy      = NULL,
 498         .hs_object      = ldlm_res_hop_object,
 499         .hs_get         = ldlm_res_hop_get_locked,
 500         .hs_put_locked  = ldlm_res_hop_put_locked,
 501         .hs_put         = ldlm_res_hop_put
 502 };
 503
 504 typedef struct {
 505         ldlm_ns_type_t  nsd_type;
 506         /** hash bucket bits */
 507         unsigned        nsd_bkt_bits;
 508         /** hash bits */
 509         unsigned        nsd_all_bits;
 510         /** hash operations */
 511         cfs_hash_ops_t *nsd_hops;
 512 } ldlm_ns_hash_def_t;
 513
 514 ldlm_ns_hash_def_t ldlm_ns_hash_defs[] =
 515 {
 516         {
 517                 .nsd_type       = LDLM_NS_TYPE_MDC,
 518                 .nsd_bkt_bits   = 11,
 519                 .nsd_all_bits   = 16,
 520                 .nsd_hops       = &ldlm_ns_fid_hash_ops,
 521         },
 522         {
 523                 .nsd_type       = LDLM_NS_TYPE_MDT,
 524                 .nsd_bkt_bits   = 14,
 525                 .nsd_all_bits   = 21,
 526                 .nsd_hops       = &ldlm_ns_fid_hash_ops,
 527         },
 528         {
 529                 .nsd_type       = LDLM_NS_TYPE_OSC,
 530                 .nsd_bkt_bits   = 8,
 531                 .nsd_all_bits   = 12,
 532                 .nsd_hops       = &ldlm_ns_hash_ops,
 533         },
 534         {
 535                 .nsd_type       = LDLM_NS_TYPE_OST,
 536                 .nsd_bkt_bits   = 11,
 537                 .nsd_all_bits   = 17,
 538                 .nsd_hops       = &ldlm_ns_hash_ops,
 539         },
 540         {
 541                 .nsd_type       = LDLM_NS_TYPE_MGC,
 542                 .nsd_bkt_bits   = 4,
 543                 .nsd_all_bits   = 4,
 544                 .nsd_hops       = &ldlm_ns_hash_ops,
 545         },
 546         {
 547                 .nsd_type       = LDLM_NS_TYPE_MGT,
 548                 .nsd_bkt_bits   = 4,
 549                 .nsd_all_bits   = 4,
 550                 .nsd_hops       = &ldlm_ns_hash_ops,
 551         },
 552         {
 553                 .nsd_type       = LDLM_NS_TYPE_UNKNOWN,
 554         },
 555 };
 556
 557 struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
 558                                           ldlm_side_t client,
 559                                           ldlm_appetite_t apt,
 560                                           ldlm_ns_type_t ns_type)
 561 {
 562         struct ldlm_namespace *ns = NULL;
 563         struct ldlm_ns_bucket *nsb;
 564         ldlm_ns_hash_def_t    *nsd;
 565         cfs_hash_bd_t          bd;
 566         int                    idx;
 567         int                    rc;
 568         ENTRY;
 569
 570         LASSERT(obd != NULL);
 571
 572         rc = ldlm_get_ref();
 573         if (rc) {
 574                 CERROR("ldlm_get_ref failed: %d\n", rc);
 575                 RETURN(NULL);
 576         }
 577
 578         for (idx = 0;;idx++) {
 579                 nsd = &ldlm_ns_hash_defs[idx];
 580                 if (nsd->nsd_type == LDLM_NS_TYPE_UNKNOWN) {
 581                         CERROR("Unknown type %d for ns %s\n", ns_type, name);
 582                         GOTO(out_ref, NULL);
 583                 }
 584
 585                 if (nsd->nsd_type == ns_type)
 586                         break;
 587         }
 588
 589         OBD_ALLOC_PTR(ns);
 590         if (!ns)
 591                 GOTO(out_ref, NULL);
 592
 593         ns->ns_rs_hash = cfs_hash_create(name,
 594                                          nsd->nsd_all_bits, nsd->nsd_all_bits,
 595                                          nsd->nsd_bkt_bits, sizeof(*nsb),
 596                                          CFS_HASH_MIN_THETA,
 597                                          CFS_HASH_MAX_THETA,
 598                                          nsd->nsd_hops,
 599                                          CFS_HASH_DEPTH |
 600                                          CFS_HASH_BIGNAME |
 601                                          CFS_HASH_SPIN_BKTLOCK |
 602                                          CFS_HASH_NO_ITEMREF);
 603         if (ns->ns_rs_hash == NULL)
 604                 GOTO(out_ns, NULL);
 605
 606         cfs_hash_for_each_bucket(ns->ns_rs_hash, &bd, idx) {
 607                 nsb = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
 608                 at_init(&nsb->nsb_at_estimate, ldlm_enqueue_min, 0);
 609                 nsb->nsb_namespace = ns;
 610         }
 611
 612         ns->ns_obd      = obd;
 613         ns->ns_appetite = apt;
 614         ns->ns_client   = client;
 615
 616         CFS_INIT_LIST_HEAD(&ns->ns_list_chain);
 617         CFS_INIT_LIST_HEAD(&ns->ns_unused_list);
 618         cfs_spin_lock_init(&ns->ns_lock);
 619         cfs_atomic_set(&ns->ns_bref, 0);
 620         cfs_waitq_init(&ns->ns_waitq);
 621
 622         ns->ns_max_nolock_size    = NS_DEFAULT_MAX_NOLOCK_BYTES;
 623         ns->ns_contention_time    = NS_DEFAULT_CONTENTION_SECONDS;
 624         ns->ns_contended_locks    = NS_DEFAULT_CONTENDED_LOCKS;
 625
 626         ns->ns_max_parallel_ast   = LDLM_DEFAULT_PARALLEL_AST_LIMIT;
 627         ns->ns_nr_unused          = 0;
 628         ns->ns_max_unused         = LDLM_DEFAULT_LRU_SIZE;
 629         ns->ns_max_age            = LDLM_DEFAULT_MAX_ALIVE;
 630         ns->ns_ctime_age_limit    = LDLM_CTIME_AGE_LIMIT;
 631         ns->ns_timeouts           = 0;
 632         ns->ns_orig_connect_flags = 0;
 633         ns->ns_connect_flags      = 0;
 634         ns->ns_stopping           = 0;
 635         rc = ldlm_namespace_proc_register(ns);
 636         if (rc != 0) {
 637                 CERROR("Can't initialize ns proc, rc %d\n", rc);
 638                 GOTO(out_hash, rc);
 639         }
 640
 641         idx = cfs_atomic_read(ldlm_namespace_nr(client));
 642         rc = ldlm_pool_init(&ns->ns_pool, ns, idx, client);
 643         if (rc) {
 644                 CERROR("Can't initialize lock pool, rc %d\n", rc);
 645                 GOTO(out_proc, rc);
 646         }
 647
 648         ldlm_namespace_register(ns, client);
 649         RETURN(ns);
 650 out_proc:
 651         ldlm_namespace_proc_unregister(ns);
 652         ldlm_namespace_cleanup(ns, 0);
 653 out_hash:
 654         cfs_hash_putref(ns->ns_rs_hash);
 655 out_ns:
 656         OBD_FREE_PTR(ns);
 657 out_ref:
 658         ldlm_put_ref();
 659         RETURN(NULL);
 660 }
 661 EXPORT_SYMBOL(ldlm_namespace_new);
 662
 663 extern struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
 664
 665 /* If flags contains FL_LOCAL_ONLY, don't try to tell the server, just cleanup.
 666  * This is currently only used for recovery, and we make certain assumptions
 667  * as a result--notably, that we shouldn't cancel locks with refs. -phil */
 668 static void cleanup_resource(struct ldlm_resource *res, cfs_list_t *q,
 669                              __u64 flags)
 670 {
 671         cfs_list_t *tmp;
 672         int rc = 0, client = ns_is_client(ldlm_res_to_ns(res));
 673         bool local_only = !!(flags & LDLM_FL_LOCAL_ONLY);
 674
 675         do {
 676                 struct ldlm_lock *lock = NULL;
 677
 678                 /* first, we look for non-cleaned-yet lock
 679                  * all cleaned locks are marked by CLEANED flag */
 680                 lock_res(res);
 681                 cfs_list_for_each(tmp, q) {
 682                         lock = cfs_list_entry(tmp, struct ldlm_lock,
 683                                               l_res_link);
 684                         if (lock->l_flags & LDLM_FL_CLEANED) {
 685                                 lock = NULL;
 686                                 continue;
 687                         }
 688                         LDLM_LOCK_GET(lock);
 689                         lock->l_flags |= LDLM_FL_CLEANED;
 690                         break;
 691                 }
 692
 693                 if (lock == NULL) {
 694                         unlock_res(res);
 695                         break;
 696                 }
 697
 698                 /* Set CBPENDING so nothing in the cancellation path
 699                  * can match this lock */
 700                 lock->l_flags |= LDLM_FL_CBPENDING;
 701                 lock->l_flags |= LDLM_FL_FAILED;
 702                 lock->l_flags |= flags;
 703
 704                 /* ... without sending a CANCEL message for local_only. */
 705                 if (local_only)
 706                         lock->l_flags |= LDLM_FL_LOCAL_ONLY;
 707
 708                 if (local_only && (lock->l_readers || lock->l_writers)) {
 709                         /* This is a little bit gross, but much better than the
 710                          * alternative: pretend that we got a blocking AST from
 711                          * the server, so that when the lock is decref'd, it
 712                          * will go away ... */
 713                         unlock_res(res);
 714                         LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
 715                         if (lock->l_completion_ast)
 716                                 lock->l_completion_ast(lock, 0, NULL);
 717                         LDLM_LOCK_RELEASE(lock);
 718                         continue;
 719                 }
 720
 721                 if (client) {
 722                         struct lustre_handle lockh;
 723
 724                         unlock_res(res);
 725                         ldlm_lock2handle(lock, &lockh);
 726                         rc = ldlm_cli_cancel(&lockh);
 727                         if (rc)
 728                                 CERROR("ldlm_cli_cancel: %d\n", rc);
 729                 } else {
 730                         ldlm_resource_unlink_lock(lock);
 731                         unlock_res(res);
 732                         LDLM_DEBUG(lock, "Freeing a lock still held by a "
 733                                    "client node");
 734                         ldlm_lock_destroy(lock);
 735                 }
 736                 LDLM_LOCK_RELEASE(lock);
 737         } while (1);
 738 }
 739
 740 static int ldlm_resource_clean(cfs_hash_t *hs, cfs_hash_bd_t *bd,
 741                                cfs_hlist_node_t *hnode, void *arg)
 742 {
 743         struct ldlm_resource *res = cfs_hash_object(hs, hnode);
 744         __u64 flags = *(__u64 *)arg;
 745
 746         cleanup_resource(res, &res->lr_granted, flags);
 747         cleanup_resource(res, &res->lr_converting, flags);
 748         cleanup_resource(res, &res->lr_waiting, flags);
 749
 750         return 0;
 751 }
 752
 753 static int ldlm_resource_complain(cfs_hash_t *hs, cfs_hash_bd_t *bd,
 754                                   cfs_hlist_node_t *hnode, void *arg)
 755 {
 756         struct ldlm_resource  *res = cfs_hash_object(hs, hnode);
 757
 758         CERROR("Namespace %s resource refcount nonzero "
 759                "(%d) after lock cleanup; forcing "
 760                "cleanup.\n",
 761                ldlm_ns_name(ldlm_res_to_ns(res)),
 762                cfs_atomic_read(&res->lr_refcount) - 1);
 763
 764         CERROR("Resource: %p ("LPU64"/"LPU64"/"LPU64"/"
 765                LPU64") (rc: %d)\n", res,
 766                res->lr_name.name[0], res->lr_name.name[1],
 767                res->lr_name.name[2], res->lr_name.name[3],
 768                cfs_atomic_read(&res->lr_refcount) - 1);
 769         return 0;
 770 }
 771
 772 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, __u64 flags)
 773 {
 774         if (ns == NULL) {
 775                 CDEBUG(D_INFO, "NULL ns, skipping cleanup\n");
 776                 return ELDLM_OK;
 777         }
 778
 779         cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_clean, &flags);
 780         cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_complain, NULL);
 781         return ELDLM_OK;
 782 }
 783 EXPORT_SYMBOL(ldlm_namespace_cleanup);
 784
 785 static int __ldlm_namespace_free(struct ldlm_namespace *ns, int force)
 786 {
 787         ENTRY;
 788
 789         /* At shutdown time, don't call the cancellation callback */
 790         ldlm_namespace_cleanup(ns, force ? LDLM_FL_LOCAL_ONLY : 0);
 791
 792         if (cfs_atomic_read(&ns->ns_bref) > 0) {
 793                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 794                 int rc;
 795                 CDEBUG(D_DLMTRACE,
 796                        "dlm namespace %s free waiting on refcount %d\n",
 797                        ldlm_ns_name(ns), cfs_atomic_read(&ns->ns_bref));
 798 force_wait:
 799                 if (force)
 800                         lwi = LWI_TIMEOUT(obd_timeout * CFS_HZ / 4, NULL, NULL);
 801
 802                 rc = l_wait_event(ns->ns_waitq,
 803                                   cfs_atomic_read(&ns->ns_bref) == 0, &lwi);
 804
 805                 /* Forced cleanups should be able to reclaim all references,
 806                  * so it's safe to wait forever... we can't leak locks... */
 807                 if (force && rc == -ETIMEDOUT) {
 808                         LCONSOLE_ERROR("Forced cleanup waiting for %s "
 809                                        "namespace with %d resources in use, "
 810                                        "(rc=%d)\n", ldlm_ns_name(ns),
 811                                        cfs_atomic_read(&ns->ns_bref), rc);
 812                         GOTO(force_wait, rc);
 813                 }
 814
 815                 if (cfs_atomic_read(&ns->ns_bref)) {
 816                         LCONSOLE_ERROR("Cleanup waiting for %s namespace "
 817                                        "with %d resources in use, (rc=%d)\n",
 818                                        ldlm_ns_name(ns),
 819                                        cfs_atomic_read(&ns->ns_bref), rc);
 820                         RETURN(ELDLM_NAMESPACE_EXISTS);
 821                 }
 822                 CDEBUG(D_DLMTRACE, "dlm namespace %s free done waiting\n",
 823                        ldlm_ns_name(ns));
 824         }
 825
 826         RETURN(ELDLM_OK);
 827 }
 828
 829 /**
 830  * Performs various cleanups for passed \a ns to make it drop refc and be ready
 831  * for freeing. Waits for refc == 0.
 832  *
 833  * The following is done:
 834  * (0) Unregister \a ns from its list to make inaccessible for potential users
 835  * like pools thread and others;
 836  * (1) Clear all locks in \a ns.
 837  */
 838 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
 839                                struct obd_import *imp,
 840                                int force)
 841 {
 842         int rc;
 843         ENTRY;
 844         if (!ns) {
 845                 EXIT;
 846                 return;
 847         }
 848
 849         cfs_spin_lock(&ns->ns_lock);
 850         ns->ns_stopping = 1;
 851         cfs_spin_unlock(&ns->ns_lock);
 852
 853         /*
 854          * Can fail with -EINTR when force == 0 in which case try harder.
 855          */
 856         rc = __ldlm_namespace_free(ns, force);
 857         if (rc != ELDLM_OK) {
 858                 if (imp) {
 859                         ptlrpc_disconnect_import(imp, 0);
 860                         ptlrpc_invalidate_import(imp);
 861                 }
 862
 863                 /*
 864                  * With all requests dropped and the import inactive
 865                  * we are gaurenteed all reference will be dropped.
 866                  */
 867                 rc = __ldlm_namespace_free(ns, 1);
 868                 LASSERT(rc == 0);
 869         }
 870         EXIT;
 871 }
 872
 873 /**
 874  * Performs freeing memory structures related to \a ns. This is only done when
 875  * ldlm_namespce_free_prior() successfully removed all resources referencing
 876  * \a ns and its refc == 0.
 877  */
 878 void ldlm_namespace_free_post(struct ldlm_namespace *ns)
 879 {
 880         ENTRY;
 881         if (!ns) {
 882                 EXIT;
 883                 return;
 884         }
 885
 886
 887         /*
 888          * Make sure that nobody can find this ns in its list.
 889          */
 890         ldlm_namespace_unregister(ns, ns->ns_client);
 891         /*
 892          * Fini pool _before_ parent proc dir is removed. This is important as
 893          * ldlm_pool_fini() removes own proc dir which is child to @dir. Removing
 894          * it after @dir may cause oops.
 895          */
 896         ldlm_pool_fini(&ns->ns_pool);
 897
 898         ldlm_namespace_proc_unregister(ns);
 899         cfs_hash_putref(ns->ns_rs_hash);
 900         /*
 901          * Namespace \a ns should be not on list in this time, otherwise this
 902          * will cause issues realted to using freed \a ns in pools thread.
 903          */
 904         LASSERT(cfs_list_empty(&ns->ns_list_chain));
 905         OBD_FREE_PTR(ns);
 906         ldlm_put_ref();
 907         EXIT;
 908 }
 909
 910
 911 /* Cleanup the resource, and free namespace.
 912  * bug 12864:
 913  * Deadlock issue:
 914  * proc1: destroy import
 915  *        class_disconnect_export(grab cl_sem) ->
 916  *              -> ldlm_namespace_free ->
 917  *              -> lprocfs_remove(grab _lprocfs_lock).
 918  * proc2: read proc info
 919  *        lprocfs_fops_read(grab _lprocfs_lock) ->
 920  *              -> osc_rd_active, etc(grab cl_sem).
 921  *
 922  * So that I have to split the ldlm_namespace_free into two parts - the first
 923  * part ldlm_namespace_free_prior is used to cleanup the resource which is
 924  * being used; the 2nd part ldlm_namespace_free_post is used to unregister the
 925  * lprocfs entries, and then free memory. It will be called w/o cli->cl_sem
 926  * held.
 927  */
 928 void ldlm_namespace_free(struct ldlm_namespace *ns,
 929                          struct obd_import *imp,
 930                          int force)
 931 {
 932         ldlm_namespace_free_prior(ns, imp, force);
 933         ldlm_namespace_free_post(ns);
 934 }
 935 EXPORT_SYMBOL(ldlm_namespace_free);
 936
 937 void ldlm_namespace_get(struct ldlm_namespace *ns)
 938 {
 939         cfs_atomic_inc(&ns->ns_bref);
 940 }
 941 EXPORT_SYMBOL(ldlm_namespace_get);
 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 EXPORT_SYMBOL(ldlm_namespace_put);
 951
 952 /* Register @ns in the list of namespaces */
 953 void ldlm_namespace_register(struct ldlm_namespace *ns, ldlm_side_t client)
 954 {
 955         cfs_mutex_lock(ldlm_namespace_lock(client));
 956         LASSERT(cfs_list_empty(&ns->ns_list_chain));
 957         cfs_list_add(&ns->ns_list_chain, ldlm_namespace_list(client));
 958         cfs_atomic_inc(ldlm_namespace_nr(client));
 959         cfs_mutex_unlock(ldlm_namespace_lock(client));
 960 }
 961
 962 /* Unregister @ns from the list of namespaces */
 963 void ldlm_namespace_unregister(struct ldlm_namespace *ns, ldlm_side_t client)
 964 {
 965         cfs_mutex_lock(ldlm_namespace_lock(client));
 966         LASSERT(!cfs_list_empty(&ns->ns_list_chain));
 967         /*
 968          * Some asserts and possibly other parts of code still using
 969          * list_empty(&ns->ns_list_chain). This is why it is important
 970          * to use list_del_init() here.
 971          */
 972         cfs_list_del_init(&ns->ns_list_chain);
 973         cfs_atomic_dec(ldlm_namespace_nr(client));
 974         cfs_mutex_unlock(ldlm_namespace_lock(client));
 975 }
 976
 977 /* Should be called under ldlm_namespace_lock(client) taken */
 978 void ldlm_namespace_move_locked(struct ldlm_namespace *ns, ldlm_side_t client)
 979 {
 980         LASSERT(!cfs_list_empty(&ns->ns_list_chain));
 981         LASSERT_MUTEX_LOCKED(ldlm_namespace_lock(client));
 982         cfs_list_move_tail(&ns->ns_list_chain, ldlm_namespace_list(client));
 983 }
 984
 985 /* Should be called under ldlm_namespace_lock(client) taken */
 986 struct ldlm_namespace *ldlm_namespace_first_locked(ldlm_side_t client)
 987 {
 988         LASSERT_MUTEX_LOCKED(ldlm_namespace_lock(client));
 989         LASSERT(!cfs_list_empty(ldlm_namespace_list(client)));
 990         return container_of(ldlm_namespace_list(client)->next,
 991                 struct ldlm_namespace, ns_list_chain);
 992 }
 993
 994 static struct ldlm_resource *ldlm_resource_new(void)
 995 {
 996         struct ldlm_resource *res;
 997         int idx;
 998
 999         OBD_SLAB_ALLOC_PTR_GFP(res, ldlm_resource_slab, CFS_ALLOC_IO);
1000         if (res == NULL)
1001                 return NULL;
1002
1003         CFS_INIT_LIST_HEAD(&res->lr_granted);
1004         CFS_INIT_LIST_HEAD(&res->lr_converting);
1005         CFS_INIT_LIST_HEAD(&res->lr_waiting);
1006
1007         /* initialize interval trees for each lock mode*/
1008         for (idx = 0; idx < LCK_MODE_NUM; idx++) {
1009                 res->lr_itree[idx].lit_size = 0;
1010                 res->lr_itree[idx].lit_mode = 1 << idx;
1011                 res->lr_itree[idx].lit_root = NULL;
1012         }
1013
1014         cfs_atomic_set(&res->lr_refcount, 1);
1015         cfs_spin_lock_init(&res->lr_lock);
1016         lu_ref_init(&res->lr_reference);
1017
1018         /* one who creates the resource must unlock
1019          * the mutex after lvb initialization */
1020         cfs_mutex_init(&res->lr_lvb_mutex);
1021         cfs_mutex_lock(&res->lr_lvb_mutex);
1022
1023         return res;
1024 }
1025
1026 /* Args: unlocked namespace
1027  *  * Locks: takes and releases NS hash-lock and res->lr_lock
1028  *   * Returns: referenced, unlocked ldlm_resource or NULL */
1029 struct ldlm_resource *
1030 ldlm_resource_get(struct ldlm_namespace *ns, struct ldlm_resource *parent,
1031                   const struct ldlm_res_id *name, ldlm_type_t type, int create)
1032 {
1033         cfs_hlist_node_t     *hnode;
1034         struct ldlm_resource *res;
1035         cfs_hash_bd_t         bd;
1036         __u64                 version;
1037
1038         LASSERT(ns != NULL);
1039         LASSERT(parent == NULL);
1040         LASSERT(ns->ns_rs_hash != NULL);
1041         LASSERT(name->name[0] != 0);
1042
1043         cfs_hash_bd_get_and_lock(ns->ns_rs_hash, (void *)name, &bd, 0);
1044         hnode = cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1045         if (hnode != NULL) {
1046                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1047                 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
1048                 /* synchronize WRT resource creation */
1049                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1050                         cfs_mutex_lock(&res->lr_lvb_mutex);
1051                         cfs_mutex_unlock(&res->lr_lvb_mutex);
1052                 }
1053                 return res;
1054         }
1055
1056         version = cfs_hash_bd_version_get(&bd);
1057         cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1058
1059         if (create == 0)
1060                 return NULL;
1061
1062         LASSERTF(type >= LDLM_MIN_TYPE && type < LDLM_MAX_TYPE,
1063                  "type: %d\n", type);
1064         res = ldlm_resource_new();
1065         if (!res)
1066                 return NULL;
1067
1068         res->lr_ns_bucket  = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
1069         res->lr_name       = *name;
1070         res->lr_type       = type;
1071         res->lr_most_restr = LCK_NL;
1072
1073         cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
1074         hnode = (version == cfs_hash_bd_version_get(&bd)) ?  NULL :
1075                 cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1076
1077         if (hnode != NULL) {
1078                 /* someone won the race and added the resource before */
1079                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1080                 /* clean lu_ref for failed resource */
1081                 lu_ref_fini(&res->lr_reference);
1082                 /* We have taken lr_lvb_mutex. Drop it. */
1083                 cfs_mutex_unlock(&res->lr_lvb_mutex);
1084                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1085
1086                 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
1087                 /* synchronize WRT resource creation */
1088                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1089                         cfs_mutex_lock(&res->lr_lvb_mutex);
1090                         cfs_mutex_unlock(&res->lr_lvb_mutex);
1091                 }
1092                 return res;
1093         }
1094         /* we won! let's add the resource */
1095         cfs_hash_bd_add_locked(ns->ns_rs_hash, &bd, &res->lr_hash);
1096         if (cfs_hash_bd_count_get(&bd) == 1)
1097                 ldlm_namespace_get(ns);
1098
1099         cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1100         if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1101                 int rc;
1102
1103                 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CREATE_RESOURCE, 2);
1104                 rc = ns->ns_lvbo->lvbo_init(res);
1105                 if (rc)
1106                         CERROR("lvbo_init failed for resource "
1107                                LPU64": rc %d\n", name->name[0], rc);
1108         }
1109
1110         /* we create resource with locked lr_lvb_mutex */
1111         cfs_mutex_unlock(&res->lr_lvb_mutex);
1112
1113         return res;
1114 }
1115 EXPORT_SYMBOL(ldlm_resource_get);
1116
1117 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res)
1118 {
1119         LASSERT(res != NULL);
1120         LASSERT(res != LP_POISON);
1121         cfs_atomic_inc(&res->lr_refcount);
1122         CDEBUG(D_INFO, "getref res: %p count: %d\n", res,
1123                cfs_atomic_read(&res->lr_refcount));
1124         return res;
1125 }
1126
1127 static void __ldlm_resource_putref_final(cfs_hash_bd_t *bd,
1128                                          struct ldlm_resource *res)
1129 {
1130         struct ldlm_ns_bucket *nsb = res->lr_ns_bucket;
1131
1132         if (!cfs_list_empty(&res->lr_granted)) {
1133                 ldlm_resource_dump(D_ERROR, res);
1134                 LBUG();
1135         }
1136
1137         if (!cfs_list_empty(&res->lr_converting)) {
1138                 ldlm_resource_dump(D_ERROR, res);
1139                 LBUG();
1140         }
1141
1142         if (!cfs_list_empty(&res->lr_waiting)) {
1143                 ldlm_resource_dump(D_ERROR, res);
1144                 LBUG();
1145         }
1146
1147         cfs_hash_bd_del_locked(nsb->nsb_namespace->ns_rs_hash,
1148                                bd, &res->lr_hash);
1149         lu_ref_fini(&res->lr_reference);
1150         if (cfs_hash_bd_count_get(bd) == 0)
1151                 ldlm_namespace_put(nsb->nsb_namespace);
1152 }
1153
1154 /* Returns 1 if the resource was freed, 0 if it remains. */
1155 int ldlm_resource_putref(struct ldlm_resource *res)
1156 {
1157         struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1158         cfs_hash_bd_t   bd;
1159
1160         LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
1161         CDEBUG(D_INFO, "putref res: %p count: %d\n",
1162                res, cfs_atomic_read(&res->lr_refcount) - 1);
1163
1164         cfs_hash_bd_get(ns->ns_rs_hash, &res->lr_name, &bd);
1165         if (cfs_hash_bd_dec_and_lock(ns->ns_rs_hash, &bd, &res->lr_refcount)) {
1166                 __ldlm_resource_putref_final(&bd, res);
1167                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1168                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
1169                         ns->ns_lvbo->lvbo_free(res);
1170                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1171                 return 1;
1172         }
1173         return 0;
1174 }
1175 EXPORT_SYMBOL(ldlm_resource_putref);
1176
1177 /* Returns 1 if the resource was freed, 0 if it remains. */
1178 int ldlm_resource_putref_locked(struct ldlm_resource *res)
1179 {
1180         struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1181
1182         LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
1183         CDEBUG(D_INFO, "putref res: %p count: %d\n",
1184                res, cfs_atomic_read(&res->lr_refcount) - 1);
1185
1186         if (cfs_atomic_dec_and_test(&res->lr_refcount)) {
1187                 cfs_hash_bd_t bd;
1188
1189                 cfs_hash_bd_get(ldlm_res_to_ns(res)->ns_rs_hash,
1190                                 &res->lr_name, &bd);
1191                 __ldlm_resource_putref_final(&bd, res);
1192                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1193                 /* NB: ns_rs_hash is created with CFS_HASH_NO_ITEMREF,
1194                  * so we should never be here while calling cfs_hash_del,
1195                  * cfs_hash_for_each_nolock is the only case we can get
1196                  * here, which is safe to release cfs_hash_bd_lock.
1197                  */
1198                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
1199                         ns->ns_lvbo->lvbo_free(res);
1200                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1201
1202                 cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
1203                 return 1;
1204         }
1205         return 0;
1206 }
1207
1208 void ldlm_resource_add_lock(struct ldlm_resource *res, cfs_list_t *head,
1209                             struct ldlm_lock *lock)
1210 {
1211         check_res_locked(res);
1212
1213         LDLM_DEBUG(lock, "About to add this lock:\n");
1214
1215         if (lock->l_destroyed) {
1216                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1217                 return;
1218         }
1219
1220         LASSERT(cfs_list_empty(&lock->l_res_link));
1221
1222         cfs_list_add_tail(&lock->l_res_link, head);
1223 }
1224
1225 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
1226                                      struct ldlm_lock *new)
1227 {
1228         struct ldlm_resource *res = original->l_resource;
1229
1230         check_res_locked(res);
1231
1232         ldlm_resource_dump(D_INFO, res);
1233         LDLM_DEBUG(new, "About to insert this lock after %p:\n", original);
1234
1235         if (new->l_destroyed) {
1236                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1237                 goto out;
1238         }
1239
1240         LASSERT(cfs_list_empty(&new->l_res_link));
1241
1242         cfs_list_add(&new->l_res_link, &original->l_res_link);
1243  out:;
1244 }
1245
1246 void ldlm_resource_unlink_lock(struct ldlm_lock *lock)
1247 {
1248         int type = lock->l_resource->lr_type;
1249
1250         check_res_locked(lock->l_resource);
1251         if (type == LDLM_IBITS || type == LDLM_PLAIN)
1252                 ldlm_unlink_lock_skiplist(lock);
1253         else if (type == LDLM_EXTENT)
1254                 ldlm_extent_unlink_lock(lock);
1255         cfs_list_del_init(&lock->l_res_link);
1256 }
1257 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
1258
1259 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc)
1260 {
1261         desc->lr_type = res->lr_type;
1262         desc->lr_name = res->lr_name;
1263 }
1264
1265 void ldlm_dump_all_namespaces(ldlm_side_t client, int level)
1266 {
1267         cfs_list_t *tmp;
1268
1269         if (!((libcfs_debug | D_ERROR) & level))
1270                 return;
1271
1272         cfs_mutex_lock(ldlm_namespace_lock(client));
1273
1274         cfs_list_for_each(tmp, ldlm_namespace_list(client)) {
1275                 struct ldlm_namespace *ns;
1276                 ns = cfs_list_entry(tmp, struct ldlm_namespace, ns_list_chain);
1277                 ldlm_namespace_dump(level, ns);
1278         }
1279
1280         cfs_mutex_unlock(ldlm_namespace_lock(client));
1281 }
1282 EXPORT_SYMBOL(ldlm_dump_all_namespaces);
1283
1284 static int ldlm_res_hash_dump(cfs_hash_t *hs, cfs_hash_bd_t *bd,
1285                               cfs_hlist_node_t *hnode, void *arg)
1286 {
1287         struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1288         int    level = (int)(unsigned long)arg;
1289
1290         lock_res(res);
1291         ldlm_resource_dump(level, res);
1292         unlock_res(res);
1293
1294         return 0;
1295 }
1296
1297 void ldlm_namespace_dump(int level, struct ldlm_namespace *ns)
1298 {
1299         if (!((libcfs_debug | D_ERROR) & level))
1300                 return;
1301
1302         CDEBUG(level, "--- Namespace: %s (rc: %d, side: %s)\n",
1303                ldlm_ns_name(ns), cfs_atomic_read(&ns->ns_bref),
1304                ns_is_client(ns) ? "client" : "server");
1305
1306         if (cfs_time_before(cfs_time_current(), ns->ns_next_dump))
1307                 return;
1308
1309         cfs_hash_for_each_nolock(ns->ns_rs_hash,
1310                                  ldlm_res_hash_dump,
1311                                  (void *)(unsigned long)level);
1312         cfs_spin_lock(&ns->ns_lock);
1313         ns->ns_next_dump = cfs_time_shift(10);
1314         cfs_spin_unlock(&ns->ns_lock);
1315 }
1316 EXPORT_SYMBOL(ldlm_namespace_dump);
1317
1318 void ldlm_resource_dump(int level, struct ldlm_resource *res)
1319 {
1320         struct ldlm_lock *lock;
1321         unsigned int granted = 0;
1322
1323         CLASSERT(RES_NAME_SIZE == 4);
1324
1325         if (!((libcfs_debug | D_ERROR) & level))
1326                 return;
1327
1328         CDEBUG(level, "--- Resource: %p ("LPU64"/"LPU64"/"LPU64"/"LPU64
1329                ") (rc: %d)\n", res, res->lr_name.name[0], res->lr_name.name[1],
1330                res->lr_name.name[2], res->lr_name.name[3],
1331                cfs_atomic_read(&res->lr_refcount));
1332
1333         if (!cfs_list_empty(&res->lr_granted)) {
1334                 CDEBUG(level, "Granted locks (in reverse order):\n");
1335                 cfs_list_for_each_entry_reverse(lock, &res->lr_granted,
1336                                                 l_res_link) {
1337                         LDLM_DEBUG_LIMIT(level, lock, "###");
1338                         if (!(level & D_CANTMASK) &&
1339                             ++granted > ldlm_dump_granted_max) {
1340                                 CDEBUG(level, "only dump %d granted locks to "
1341                                        "avoid DDOS.\n", granted);
1342                                 break;
1343                         }
1344                 }
1345         }
1346         if (!cfs_list_empty(&res->lr_converting)) {
1347                 CDEBUG(level, "Converting locks:\n");
1348                 cfs_list_for_each_entry(lock, &res->lr_converting, l_res_link)
1349                         LDLM_DEBUG_LIMIT(level, lock, "###");
1350         }
1351         if (!cfs_list_empty(&res->lr_waiting)) {
1352                 CDEBUG(level, "Waiting locks:\n");
1353                 cfs_list_for_each_entry(lock, &res->lr_waiting, l_res_link)
1354                         LDLM_DEBUG_LIMIT(level, lock, "###");
1355         }
1356 }