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) 2010, 2012, Intel Corporation.
  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 struct mutex ldlm_srv_namespace_lock;
  59 CFS_LIST_HEAD(ldlm_srv_namespace_list);
  60
  61 struct mutex 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 LRU resize was originally 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 static int lprocfs_rd_elc(char *page, char **start, off_t off,
 274                           int count, int *eof, void *data)
 275 {
 276         struct ldlm_namespace *ns = data;
 277         unsigned int supp = ns_connect_cancelset(ns);
 278
 279         return lprocfs_rd_uint(page, start, off, count, eof, &supp);
 280 }
 281
 282 static int lprocfs_wr_elc(struct file *file, const char *buffer,
 283                                unsigned long count, void *data)
 284 {
 285         struct ldlm_namespace *ns = data;
 286         unsigned int supp = -1;
 287         int rc;
 288
 289         rc = lprocfs_wr_uint(file, buffer, count, &supp);
 290         if (rc < 0)
 291                 return rc;
 292
 293         if (supp == 0)
 294                 ns->ns_connect_flags &= ~OBD_CONNECT_CANCELSET;
 295         else if (ns->ns_orig_connect_flags & OBD_CONNECT_CANCELSET)
 296                 ns->ns_connect_flags |= OBD_CONNECT_CANCELSET;
 297         return count;
 298 }
 299
 300 void ldlm_namespace_proc_unregister(struct ldlm_namespace *ns)
 301 {
 302         struct proc_dir_entry *dir;
 303
 304         dir = lprocfs_srch(ldlm_ns_proc_dir, ldlm_ns_name(ns));
 305         if (dir == NULL) {
 306                 CERROR("dlm namespace %s has no procfs dir?\n",
 307                        ldlm_ns_name(ns));
 308         } else {
 309                 lprocfs_remove(&dir);
 310         }
 311
 312         if (ns->ns_stats != NULL)
 313                 lprocfs_free_stats(&ns->ns_stats);
 314 }
 315
 316 int ldlm_namespace_proc_register(struct ldlm_namespace *ns)
 317 {
 318         struct lprocfs_vars lock_vars[2];
 319         char lock_name[MAX_STRING_SIZE + 1];
 320
 321         LASSERT(ns != NULL);
 322         LASSERT(ns->ns_rs_hash != NULL);
 323
 324         ns->ns_stats = lprocfs_alloc_stats(LDLM_NSS_LAST, 0);
 325         if (ns->ns_stats == NULL)
 326                 return -ENOMEM;
 327
 328         lprocfs_counter_init(ns->ns_stats, LDLM_NSS_LOCKS,
 329                              LPROCFS_CNTR_AVGMINMAX, "locks", "locks");
 330
 331         lock_name[MAX_STRING_SIZE] = '\0';
 332
 333         memset(lock_vars, 0, sizeof(lock_vars));
 334         lock_vars[0].name = lock_name;
 335
 336         snprintf(lock_name, MAX_STRING_SIZE, "%s/resource_count",
 337                  ldlm_ns_name(ns));
 338         lock_vars[0].data = ns;
 339         lock_vars[0].read_fptr = lprocfs_rd_ns_resources;
 340         lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 341
 342         snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_count",
 343                  ldlm_ns_name(ns));
 344         lock_vars[0].data = ns;
 345         lock_vars[0].read_fptr = lprocfs_rd_ns_locks;
 346         lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 347
 348         if (ns_is_client(ns)) {
 349                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_unused_count",
 350                          ldlm_ns_name(ns));
 351                 lock_vars[0].data = &ns->ns_nr_unused;
 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/lru_size",
 356                          ldlm_ns_name(ns));
 357                 lock_vars[0].data = ns;
 358                 lock_vars[0].read_fptr = lprocfs_rd_lru_size;
 359                 lock_vars[0].write_fptr = lprocfs_wr_lru_size;
 360                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 361
 362                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lru_max_age",
 363                          ldlm_ns_name(ns));
 364                 lock_vars[0].data = &ns->ns_max_age;
 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/early_lock_cancel",
 370                          ldlm_ns_name(ns));
 371                 lock_vars[0].data = ns;
 372                 lock_vars[0].read_fptr = lprocfs_rd_elc;
 373                 lock_vars[0].write_fptr = lprocfs_wr_elc;
 374                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 375         } else {
 376                 snprintf(lock_name, MAX_STRING_SIZE, "%s/ctime_age_limit",
 377                          ldlm_ns_name(ns));
 378                 lock_vars[0].data = &ns->ns_ctime_age_limit;
 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                 snprintf(lock_name, MAX_STRING_SIZE, "%s/lock_timeouts",
 384                          ldlm_ns_name(ns));
 385                 lock_vars[0].data = &ns->ns_timeouts;
 386                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 387                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 388
 389                 snprintf(lock_name, MAX_STRING_SIZE, "%s/max_nolock_bytes",
 390                          ldlm_ns_name(ns));
 391                 lock_vars[0].data = &ns->ns_max_nolock_size;
 392                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 393                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 394                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 395
 396                 snprintf(lock_name, MAX_STRING_SIZE, "%s/contention_seconds",
 397                          ldlm_ns_name(ns));
 398                 lock_vars[0].data = &ns->ns_contention_time;
 399                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 400                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 401                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 402
 403                 snprintf(lock_name, MAX_STRING_SIZE, "%s/contended_locks",
 404                          ldlm_ns_name(ns));
 405                 lock_vars[0].data = &ns->ns_contended_locks;
 406                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 407                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 408                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 409
 410                 snprintf(lock_name, MAX_STRING_SIZE, "%s/max_parallel_ast",
 411                          ldlm_ns_name(ns));
 412                 lock_vars[0].data = &ns->ns_max_parallel_ast;
 413                 lock_vars[0].read_fptr = lprocfs_rd_uint;
 414                 lock_vars[0].write_fptr = lprocfs_wr_uint;
 415                 lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
 416         }
 417         return 0;
 418 }
 419 #undef MAX_STRING_SIZE
 420 #else /* LPROCFS */
 421
 422 #define ldlm_namespace_proc_unregister(ns)      ({;})
 423 #define ldlm_namespace_proc_register(ns)        ({0;})
 424
 425 #endif /* LPROCFS */
 426
 427 static unsigned ldlm_res_hop_hash(cfs_hash_t *hs,
 428                                   const void *key, unsigned mask)
 429 {
 430         const struct ldlm_res_id     *id  = key;
 431         unsigned                val = 0;
 432         unsigned                i;
 433
 434         for (i = 0; i < RES_NAME_SIZE; i++)
 435                 val += id->name[i];
 436         return val & mask;
 437 }
 438
 439 static unsigned ldlm_res_hop_fid_hash(cfs_hash_t *hs,
 440                                       const void *key, unsigned mask)
 441 {
 442         const struct ldlm_res_id *id = key;
 443         struct lu_fid       fid;
 444         __u32               hash;
 445         __u32               val;
 446
 447         fid.f_seq = id->name[LUSTRE_RES_ID_SEQ_OFF];
 448         fid.f_oid = (__u32)id->name[LUSTRE_RES_ID_VER_OID_OFF];
 449         fid.f_ver = (__u32)(id->name[LUSTRE_RES_ID_VER_OID_OFF] >> 32);
 450
 451         hash = fid_flatten32(&fid);
 452         hash += (hash >> 4) + (hash << 12); /* mixing oid and seq */
 453         if (id->name[LUSTRE_RES_ID_HSH_OFF] != 0) {
 454                 val = id->name[LUSTRE_RES_ID_HSH_OFF];
 455                 hash += (val >> 5) + (val << 11);
 456         } else {
 457                 val = fid_oid(&fid);
 458         }
 459         hash = cfs_hash_long(hash, hs->hs_bkt_bits);
 460         /* give me another random factor */
 461         hash -= cfs_hash_long((unsigned long)hs, val % 11 + 3);
 462
 463         hash <<= hs->hs_cur_bits - hs->hs_bkt_bits;
 464         hash |= ldlm_res_hop_hash(hs, key, CFS_HASH_NBKT(hs) - 1);
 465
 466         return hash & mask;
 467 }
 468
 469 static void *ldlm_res_hop_key(cfs_hlist_node_t *hnode)
 470 {
 471         struct ldlm_resource   *res;
 472
 473         res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 474         return &res->lr_name;
 475 }
 476
 477 static int ldlm_res_hop_keycmp(const void *key, cfs_hlist_node_t *hnode)
 478 {
 479         struct ldlm_resource   *res;
 480
 481         res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 482         return ldlm_res_eq((const struct ldlm_res_id *)key,
 483                            (const struct ldlm_res_id *)&res->lr_name);
 484 }
 485
 486 static void *ldlm_res_hop_object(cfs_hlist_node_t *hnode)
 487 {
 488         return cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 489 }
 490
 491 static void ldlm_res_hop_get_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
 492 {
 493         struct ldlm_resource *res;
 494
 495         res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 496         ldlm_resource_getref(res);
 497 }
 498
 499 static void ldlm_res_hop_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
 500 {
 501         struct ldlm_resource *res;
 502
 503         res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 504         /* cfs_hash_for_each_nolock is the only chance we call it */
 505         ldlm_resource_putref_locked(res);
 506 }
 507
 508 static void ldlm_res_hop_put(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
 509 {
 510         struct ldlm_resource *res;
 511
 512         res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
 513         ldlm_resource_putref(res);
 514 }
 515
 516 cfs_hash_ops_t ldlm_ns_hash_ops = {
 517         .hs_hash        = ldlm_res_hop_hash,
 518         .hs_key         = ldlm_res_hop_key,
 519         .hs_keycmp      = ldlm_res_hop_keycmp,
 520         .hs_keycpy      = NULL,
 521         .hs_object      = ldlm_res_hop_object,
 522         .hs_get         = ldlm_res_hop_get_locked,
 523         .hs_put_locked  = ldlm_res_hop_put_locked,
 524         .hs_put         = ldlm_res_hop_put
 525 };
 526
 527 cfs_hash_ops_t ldlm_ns_fid_hash_ops = {
 528         .hs_hash        = ldlm_res_hop_fid_hash,
 529         .hs_key         = ldlm_res_hop_key,
 530         .hs_keycmp      = ldlm_res_hop_keycmp,
 531         .hs_keycpy      = NULL,
 532         .hs_object      = ldlm_res_hop_object,
 533         .hs_get         = ldlm_res_hop_get_locked,
 534         .hs_put_locked  = ldlm_res_hop_put_locked,
 535         .hs_put         = ldlm_res_hop_put
 536 };
 537
 538 typedef struct {
 539         ldlm_ns_type_t  nsd_type;
 540         /** hash bucket bits */
 541         unsigned        nsd_bkt_bits;
 542         /** hash bits */
 543         unsigned        nsd_all_bits;
 544         /** hash operations */
 545         cfs_hash_ops_t *nsd_hops;
 546 } ldlm_ns_hash_def_t;
 547
 548 ldlm_ns_hash_def_t ldlm_ns_hash_defs[] =
 549 {
 550         {
 551                 .nsd_type       = LDLM_NS_TYPE_MDC,
 552                 .nsd_bkt_bits   = 11,
 553                 .nsd_all_bits   = 16,
 554                 .nsd_hops       = &ldlm_ns_fid_hash_ops,
 555         },
 556         {
 557                 .nsd_type       = LDLM_NS_TYPE_MDT,
 558                 .nsd_bkt_bits   = 14,
 559                 .nsd_all_bits   = 21,
 560                 .nsd_hops       = &ldlm_ns_fid_hash_ops,
 561         },
 562         {
 563                 .nsd_type       = LDLM_NS_TYPE_OSC,
 564                 .nsd_bkt_bits   = 8,
 565                 .nsd_all_bits   = 12,
 566                 .nsd_hops       = &ldlm_ns_hash_ops,
 567         },
 568         {
 569                 .nsd_type       = LDLM_NS_TYPE_OST,
 570                 .nsd_bkt_bits   = 11,
 571                 .nsd_all_bits   = 17,
 572                 .nsd_hops       = &ldlm_ns_hash_ops,
 573         },
 574         {
 575                 .nsd_type       = LDLM_NS_TYPE_MGC,
 576                 .nsd_bkt_bits   = 4,
 577                 .nsd_all_bits   = 4,
 578                 .nsd_hops       = &ldlm_ns_hash_ops,
 579         },
 580         {
 581                 .nsd_type       = LDLM_NS_TYPE_MGT,
 582                 .nsd_bkt_bits   = 4,
 583                 .nsd_all_bits   = 4,
 584                 .nsd_hops       = &ldlm_ns_hash_ops,
 585         },
 586         {
 587                 .nsd_type       = LDLM_NS_TYPE_UNKNOWN,
 588         },
 589 };
 590
 591 /**
 592  * Create and initialize new empty namespace.
 593  */
 594 struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
 595                                           ldlm_side_t client,
 596                                           ldlm_appetite_t apt,
 597                                           ldlm_ns_type_t ns_type)
 598 {
 599         struct ldlm_namespace *ns = NULL;
 600         struct ldlm_ns_bucket *nsb;
 601         ldlm_ns_hash_def_t    *nsd;
 602         cfs_hash_bd_t          bd;
 603         int                    idx;
 604         int                    rc;
 605         ENTRY;
 606
 607         LASSERT(obd != NULL);
 608
 609         rc = ldlm_get_ref();
 610         if (rc) {
 611                 CERROR("ldlm_get_ref failed: %d\n", rc);
 612                 RETURN(NULL);
 613         }
 614
 615         for (idx = 0;;idx++) {
 616                 nsd = &ldlm_ns_hash_defs[idx];
 617                 if (nsd->nsd_type == LDLM_NS_TYPE_UNKNOWN) {
 618                         CERROR("Unknown type %d for ns %s\n", ns_type, name);
 619                         GOTO(out_ref, NULL);
 620                 }
 621
 622                 if (nsd->nsd_type == ns_type)
 623                         break;
 624         }
 625
 626         OBD_ALLOC_PTR(ns);
 627         if (!ns)
 628                 GOTO(out_ref, NULL);
 629
 630         ns->ns_rs_hash = cfs_hash_create(name,
 631                                          nsd->nsd_all_bits, nsd->nsd_all_bits,
 632                                          nsd->nsd_bkt_bits, sizeof(*nsb),
 633                                          CFS_HASH_MIN_THETA,
 634                                          CFS_HASH_MAX_THETA,
 635                                          nsd->nsd_hops,
 636                                          CFS_HASH_DEPTH |
 637                                          CFS_HASH_BIGNAME |
 638                                          CFS_HASH_SPIN_BKTLOCK |
 639                                          CFS_HASH_NO_ITEMREF);
 640         if (ns->ns_rs_hash == NULL)
 641                 GOTO(out_ns, NULL);
 642
 643         cfs_hash_for_each_bucket(ns->ns_rs_hash, &bd, idx) {
 644                 nsb = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
 645                 at_init(&nsb->nsb_at_estimate, ldlm_enqueue_min, 0);
 646                 nsb->nsb_namespace = ns;
 647         }
 648
 649         ns->ns_obd      = obd;
 650         ns->ns_appetite = apt;
 651         ns->ns_client   = client;
 652
 653         CFS_INIT_LIST_HEAD(&ns->ns_list_chain);
 654         CFS_INIT_LIST_HEAD(&ns->ns_unused_list);
 655         spin_lock_init(&ns->ns_lock);
 656         cfs_atomic_set(&ns->ns_bref, 0);
 657         cfs_waitq_init(&ns->ns_waitq);
 658
 659         ns->ns_max_nolock_size    = NS_DEFAULT_MAX_NOLOCK_BYTES;
 660         ns->ns_contention_time    = NS_DEFAULT_CONTENTION_SECONDS;
 661         ns->ns_contended_locks    = NS_DEFAULT_CONTENDED_LOCKS;
 662
 663         ns->ns_max_parallel_ast   = LDLM_DEFAULT_PARALLEL_AST_LIMIT;
 664         ns->ns_nr_unused          = 0;
 665         ns->ns_max_unused         = LDLM_DEFAULT_LRU_SIZE;
 666         ns->ns_max_age            = LDLM_DEFAULT_MAX_ALIVE;
 667         ns->ns_ctime_age_limit    = LDLM_CTIME_AGE_LIMIT;
 668         ns->ns_timeouts           = 0;
 669         ns->ns_orig_connect_flags = 0;
 670         ns->ns_connect_flags      = 0;
 671         ns->ns_stopping           = 0;
 672         rc = ldlm_namespace_proc_register(ns);
 673         if (rc != 0) {
 674                 CERROR("Can't initialize ns proc, rc %d\n", rc);
 675                 GOTO(out_hash, rc);
 676         }
 677
 678         idx = cfs_atomic_read(ldlm_namespace_nr(client));
 679         rc = ldlm_pool_init(&ns->ns_pool, ns, idx, client);
 680         if (rc) {
 681                 CERROR("Can't initialize lock pool, rc %d\n", rc);
 682                 GOTO(out_proc, rc);
 683         }
 684
 685         ldlm_namespace_register(ns, client);
 686         RETURN(ns);
 687 out_proc:
 688         ldlm_namespace_proc_unregister(ns);
 689         ldlm_namespace_cleanup(ns, 0);
 690 out_hash:
 691         cfs_hash_putref(ns->ns_rs_hash);
 692 out_ns:
 693         OBD_FREE_PTR(ns);
 694 out_ref:
 695         ldlm_put_ref();
 696         RETURN(NULL);
 697 }
 698 EXPORT_SYMBOL(ldlm_namespace_new);
 699
 700 extern struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
 701
 702 /**
 703  * Cancel and destroy all locks on a resource.
 704  *
 705  * If flags contains FL_LOCAL_ONLY, don't try to tell the server, just
 706  * clean up.  This is currently only used for recovery, and we make
 707  * certain assumptions as a result--notably, that we shouldn't cancel
 708  * locks with refs.
 709  */
 710 static void cleanup_resource(struct ldlm_resource *res, cfs_list_t *q,
 711                              __u64 flags)
 712 {
 713         cfs_list_t *tmp;
 714         int rc = 0, client = ns_is_client(ldlm_res_to_ns(res));
 715         bool local_only = !!(flags & LDLM_FL_LOCAL_ONLY);
 716
 717         do {
 718                 struct ldlm_lock *lock = NULL;
 719
 720                 /* First, we look for non-cleaned-yet lock
 721                  * all cleaned locks are marked by CLEANED flag. */
 722                 lock_res(res);
 723                 cfs_list_for_each(tmp, q) {
 724                         lock = cfs_list_entry(tmp, struct ldlm_lock,
 725                                               l_res_link);
 726                         if (lock->l_flags & LDLM_FL_CLEANED) {
 727                                 lock = NULL;
 728                                 continue;
 729                         }
 730                         LDLM_LOCK_GET(lock);
 731                         lock->l_flags |= LDLM_FL_CLEANED;
 732                         break;
 733                 }
 734
 735                 if (lock == NULL) {
 736                         unlock_res(res);
 737                         break;
 738                 }
 739
 740                 /* Set CBPENDING so nothing in the cancellation path
 741                  * can match this lock. */
 742                 lock->l_flags |= LDLM_FL_CBPENDING;
 743                 lock->l_flags |= LDLM_FL_FAILED;
 744                 lock->l_flags |= flags;
 745
 746                 /* ... without sending a CANCEL message for local_only. */
 747                 if (local_only)
 748                         lock->l_flags |= LDLM_FL_LOCAL_ONLY;
 749
 750                 if (local_only && (lock->l_readers || lock->l_writers)) {
 751                         /* This is a little bit gross, but much better than the
 752                          * alternative: pretend that we got a blocking AST from
 753                          * the server, so that when the lock is decref'd, it
 754                          * will go away ... */
 755                         unlock_res(res);
 756                         LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
 757                         if (lock->l_completion_ast)
 758                                 lock->l_completion_ast(lock, 0, NULL);
 759                         LDLM_LOCK_RELEASE(lock);
 760                         continue;
 761                 }
 762
 763                 if (client) {
 764                         struct lustre_handle lockh;
 765
 766                         unlock_res(res);
 767                         ldlm_lock2handle(lock, &lockh);
 768                         rc = ldlm_cli_cancel(&lockh);
 769                         if (rc)
 770                                 CERROR("ldlm_cli_cancel: %d\n", rc);
 771                 } else {
 772                         ldlm_resource_unlink_lock(lock);
 773                         unlock_res(res);
 774                         LDLM_DEBUG(lock, "Freeing a lock still held by a "
 775                                    "client node");
 776                         ldlm_lock_destroy(lock);
 777                 }
 778                 LDLM_LOCK_RELEASE(lock);
 779         } while (1);
 780 }
 781
 782 static int ldlm_resource_clean(cfs_hash_t *hs, cfs_hash_bd_t *bd,
 783                                cfs_hlist_node_t *hnode, void *arg)
 784 {
 785         struct ldlm_resource *res = cfs_hash_object(hs, hnode);
 786         __u64 flags = *(__u64 *)arg;
 787
 788         cleanup_resource(res, &res->lr_granted, flags);
 789         cleanup_resource(res, &res->lr_converting, flags);
 790         cleanup_resource(res, &res->lr_waiting, flags);
 791
 792         return 0;
 793 }
 794
 795 static int ldlm_resource_complain(cfs_hash_t *hs, cfs_hash_bd_t *bd,
 796                                   cfs_hlist_node_t *hnode, void *arg)
 797 {
 798         struct ldlm_resource  *res = cfs_hash_object(hs, hnode);
 799
 800         CERROR("Namespace %s resource refcount nonzero "
 801                "(%d) after lock cleanup; forcing "
 802                "cleanup.\n",
 803                ldlm_ns_name(ldlm_res_to_ns(res)),
 804                cfs_atomic_read(&res->lr_refcount) - 1);
 805
 806         CERROR("Resource: %p ("LPU64"/"LPU64"/"LPU64"/"
 807                LPU64") (rc: %d)\n", res,
 808                res->lr_name.name[0], res->lr_name.name[1],
 809                res->lr_name.name[2], res->lr_name.name[3],
 810                cfs_atomic_read(&res->lr_refcount) - 1);
 811
 812         ldlm_resource_dump(D_ERROR, res);
 813         return 0;
 814 }
 815
 816 /**
 817  * Cancel and destroy all locks in the namespace.
 818  *
 819  * Typically used during evictions when server notified client that it was
 820  * evicted and all of its state needs to be destroyed.
 821  * Also used during shutdown.
 822  */
 823 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, __u64 flags)
 824 {
 825         if (ns == NULL) {
 826                 CDEBUG(D_INFO, "NULL ns, skipping cleanup\n");
 827                 return ELDLM_OK;
 828         }
 829
 830         cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_clean, &flags);
 831         cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_complain, NULL);
 832         return ELDLM_OK;
 833 }
 834 EXPORT_SYMBOL(ldlm_namespace_cleanup);
 835
 836 /**
 837  * Attempts to free namespace.
 838  *
 839  * Only used when namespace goes away, like during an unmount.
 840  */
 841 static int __ldlm_namespace_free(struct ldlm_namespace *ns, int force)
 842 {
 843         ENTRY;
 844
 845         /* At shutdown time, don't call the cancellation callback */
 846         ldlm_namespace_cleanup(ns, force ? LDLM_FL_LOCAL_ONLY : 0);
 847
 848         if (cfs_atomic_read(&ns->ns_bref) > 0) {
 849                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 850                 int rc;
 851                 CDEBUG(D_DLMTRACE,
 852                        "dlm namespace %s free waiting on refcount %d\n",
 853                        ldlm_ns_name(ns), cfs_atomic_read(&ns->ns_bref));
 854 force_wait:
 855                 if (force)
 856                         lwi = LWI_TIMEOUT(obd_timeout * CFS_HZ / 4, NULL, NULL);
 857
 858                 rc = l_wait_event(ns->ns_waitq,
 859                                   cfs_atomic_read(&ns->ns_bref) == 0, &lwi);
 860
 861                 /* Forced cleanups should be able to reclaim all references,
 862                  * so it's safe to wait forever... we can't leak locks... */
 863                 if (force && rc == -ETIMEDOUT) {
 864                         LCONSOLE_ERROR("Forced cleanup waiting for %s "
 865                                        "namespace with %d resources in use, "
 866                                        "(rc=%d)\n", ldlm_ns_name(ns),
 867                                        cfs_atomic_read(&ns->ns_bref), rc);
 868                         GOTO(force_wait, rc);
 869                 }
 870
 871                 if (cfs_atomic_read(&ns->ns_bref)) {
 872                         LCONSOLE_ERROR("Cleanup waiting for %s namespace "
 873                                        "with %d resources in use, (rc=%d)\n",
 874                                        ldlm_ns_name(ns),
 875                                        cfs_atomic_read(&ns->ns_bref), rc);
 876                         RETURN(ELDLM_NAMESPACE_EXISTS);
 877                 }
 878                 CDEBUG(D_DLMTRACE, "dlm namespace %s free done waiting\n",
 879                        ldlm_ns_name(ns));
 880         }
 881
 882         RETURN(ELDLM_OK);
 883 }
 884
 885 /**
 886  * Performs various cleanups for passed \a ns to make it drop refc and be
 887  * ready for freeing. Waits for refc == 0.
 888  *
 889  * The following is done:
 890  * (0) Unregister \a ns from its list to make inaccessible for potential
 891  * users like pools thread and others;
 892  * (1) Clear all locks in \a ns.
 893  */
 894 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
 895                                struct obd_import *imp,
 896                                int force)
 897 {
 898         int rc;
 899         ENTRY;
 900         if (!ns) {
 901                 EXIT;
 902                 return;
 903         }
 904
 905         spin_lock(&ns->ns_lock);
 906         ns->ns_stopping = 1;
 907         spin_unlock(&ns->ns_lock);
 908
 909         /*
 910          * Can fail with -EINTR when force == 0 in which case try harder.
 911          */
 912         rc = __ldlm_namespace_free(ns, force);
 913         if (rc != ELDLM_OK) {
 914                 if (imp) {
 915                         ptlrpc_disconnect_import(imp, 0);
 916                         ptlrpc_invalidate_import(imp);
 917                 }
 918
 919                 /*
 920                  * With all requests dropped and the import inactive
 921                  * we are gaurenteed all reference will be dropped.
 922                  */
 923                 rc = __ldlm_namespace_free(ns, 1);
 924                 LASSERT(rc == 0);
 925         }
 926         EXIT;
 927 }
 928
 929 /**
 930  * Performs freeing memory structures related to \a ns. This is only done
 931  * when ldlm_namespce_free_prior() successfully removed all resources
 932  * referencing \a ns and its refc == 0.
 933  */
 934 void ldlm_namespace_free_post(struct ldlm_namespace *ns)
 935 {
 936         ENTRY;
 937         if (!ns) {
 938                 EXIT;
 939                 return;
 940         }
 941
 942         /* Make sure that nobody can find this ns in its list. */
 943         ldlm_namespace_unregister(ns, ns->ns_client);
 944         /* Fini pool _before_ parent proc dir is removed. This is important as
 945          * ldlm_pool_fini() removes own proc dir which is child to @dir.
 946          * Removing it after @dir may cause oops. */
 947         ldlm_pool_fini(&ns->ns_pool);
 948
 949         ldlm_namespace_proc_unregister(ns);
 950         cfs_hash_putref(ns->ns_rs_hash);
 951         /* Namespace \a ns should be not on list at this time, otherwise
 952          * this will cause issues related to using freed \a ns in poold
 953          * thread. */
 954         LASSERT(cfs_list_empty(&ns->ns_list_chain));
 955         OBD_FREE_PTR(ns);
 956         ldlm_put_ref();
 957         EXIT;
 958 }
 959
 960 /**
 961  * Cleanup the resource, and free namespace.
 962  * bug 12864:
 963  * Deadlock issue:
 964  * proc1: destroy import
 965  *        class_disconnect_export(grab cl_sem) ->
 966  *              -> ldlm_namespace_free ->
 967  *              -> lprocfs_remove(grab _lprocfs_lock).
 968  * proc2: read proc info
 969  *        lprocfs_fops_read(grab _lprocfs_lock) ->
 970  *              -> osc_rd_active, etc(grab cl_sem).
 971  *
 972  * So that I have to split the ldlm_namespace_free into two parts - the first
 973  * part ldlm_namespace_free_prior is used to cleanup the resource which is
 974  * being used; the 2nd part ldlm_namespace_free_post is used to unregister the
 975  * lprocfs entries, and then free memory. It will be called w/o cli->cl_sem
 976  * held.
 977  */
 978 void ldlm_namespace_free(struct ldlm_namespace *ns,
 979                          struct obd_import *imp,
 980                          int force)
 981 {
 982         ldlm_namespace_free_prior(ns, imp, force);
 983         ldlm_namespace_free_post(ns);
 984 }
 985 EXPORT_SYMBOL(ldlm_namespace_free);
 986
 987 void ldlm_namespace_get(struct ldlm_namespace *ns)
 988 {
 989         cfs_atomic_inc(&ns->ns_bref);
 990 }
 991 EXPORT_SYMBOL(ldlm_namespace_get);
 992
 993 void ldlm_namespace_put(struct ldlm_namespace *ns)
 994 {
 995         if (cfs_atomic_dec_and_lock(&ns->ns_bref, &ns->ns_lock)) {
 996                 cfs_waitq_signal(&ns->ns_waitq);
 997                 spin_unlock(&ns->ns_lock);
 998         }
 999 }
1000 EXPORT_SYMBOL(ldlm_namespace_put);
1001
1002 /** Register \a ns in the list of namespaces */
1003 void ldlm_namespace_register(struct ldlm_namespace *ns, ldlm_side_t client)
1004 {
1005         mutex_lock(ldlm_namespace_lock(client));
1006         LASSERT(cfs_list_empty(&ns->ns_list_chain));
1007         cfs_list_add(&ns->ns_list_chain, ldlm_namespace_list(client));
1008         cfs_atomic_inc(ldlm_namespace_nr(client));
1009         mutex_unlock(ldlm_namespace_lock(client));
1010 }
1011
1012 /** Unregister \a ns from the list of namespaces. */
1013 void ldlm_namespace_unregister(struct ldlm_namespace *ns, ldlm_side_t client)
1014 {
1015         mutex_lock(ldlm_namespace_lock(client));
1016         LASSERT(!cfs_list_empty(&ns->ns_list_chain));
1017         /* Some asserts and possibly other parts of the code are still
1018          * using list_empty(&ns->ns_list_chain). This is why it is
1019          * important to use list_del_init() here. */
1020         cfs_list_del_init(&ns->ns_list_chain);
1021         cfs_atomic_dec(ldlm_namespace_nr(client));
1022         mutex_unlock(ldlm_namespace_lock(client));
1023 }
1024
1025 /** Should be called with ldlm_namespace_lock(client) taken. */
1026 void ldlm_namespace_move_locked(struct ldlm_namespace *ns, ldlm_side_t client)
1027 {
1028         LASSERT(!cfs_list_empty(&ns->ns_list_chain));
1029         LASSERT_MUTEX_LOCKED(ldlm_namespace_lock(client));
1030         cfs_list_move_tail(&ns->ns_list_chain, ldlm_namespace_list(client));
1031 }
1032
1033 /** Should be called with ldlm_namespace_lock(client) taken. */
1034 struct ldlm_namespace *ldlm_namespace_first_locked(ldlm_side_t client)
1035 {
1036         LASSERT_MUTEX_LOCKED(ldlm_namespace_lock(client));
1037         LASSERT(!cfs_list_empty(ldlm_namespace_list(client)));
1038         return container_of(ldlm_namespace_list(client)->next,
1039                 struct ldlm_namespace, ns_list_chain);
1040 }
1041
1042 /** Create and initialize new resource. */
1043 static struct ldlm_resource *ldlm_resource_new(void)
1044 {
1045         struct ldlm_resource *res;
1046         int idx;
1047
1048         OBD_SLAB_ALLOC_PTR_GFP(res, ldlm_resource_slab, CFS_ALLOC_IO);
1049         if (res == NULL)
1050                 return NULL;
1051
1052         CFS_INIT_LIST_HEAD(&res->lr_granted);
1053         CFS_INIT_LIST_HEAD(&res->lr_converting);
1054         CFS_INIT_LIST_HEAD(&res->lr_waiting);
1055
1056         /* Initialize interval trees for each lock mode. */
1057         for (idx = 0; idx < LCK_MODE_NUM; idx++) {
1058                 res->lr_itree[idx].lit_size = 0;
1059                 res->lr_itree[idx].lit_mode = 1 << idx;
1060                 res->lr_itree[idx].lit_root = NULL;
1061         }
1062
1063         cfs_atomic_set(&res->lr_refcount, 1);
1064         spin_lock_init(&res->lr_lock);
1065         lu_ref_init(&res->lr_reference);
1066
1067         /* The creator of the resource must unlock the mutex after LVB
1068          * initialization. */
1069         mutex_init(&res->lr_lvb_mutex);
1070         mutex_lock(&res->lr_lvb_mutex);
1071
1072         return res;
1073 }
1074
1075 /**
1076  * Return a reference to resource with given name, creating it if necessary.
1077  * Args: namespace with ns_lock unlocked
1078  * Locks: takes and releases NS hash-lock and res->lr_lock
1079  * Returns: referenced, unlocked ldlm_resource or NULL
1080  */
1081 struct ldlm_resource *
1082 ldlm_resource_get(struct ldlm_namespace *ns, struct ldlm_resource *parent,
1083                   const struct ldlm_res_id *name, ldlm_type_t type, int create)
1084 {
1085         cfs_hlist_node_t     *hnode;
1086         struct ldlm_resource *res;
1087         cfs_hash_bd_t         bd;
1088         __u64                 version;
1089
1090         LASSERT(ns != NULL);
1091         LASSERT(parent == NULL);
1092         LASSERT(ns->ns_rs_hash != NULL);
1093         LASSERT(name->name[0] != 0);
1094
1095         cfs_hash_bd_get_and_lock(ns->ns_rs_hash, (void *)name, &bd, 0);
1096         hnode = cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1097         if (hnode != NULL) {
1098                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1099                 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
1100                 /* Synchronize with regard to resource creation. */
1101                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1102                         mutex_lock(&res->lr_lvb_mutex);
1103                         mutex_unlock(&res->lr_lvb_mutex);
1104                 }
1105                 return res;
1106         }
1107
1108         version = cfs_hash_bd_version_get(&bd);
1109         cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1110
1111         if (create == 0)
1112                 return NULL;
1113
1114         LASSERTF(type >= LDLM_MIN_TYPE && type < LDLM_MAX_TYPE,
1115                  "type: %d\n", type);
1116         res = ldlm_resource_new();
1117         if (!res)
1118                 return NULL;
1119
1120         res->lr_ns_bucket  = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
1121         res->lr_name       = *name;
1122         res->lr_type       = type;
1123         res->lr_most_restr = LCK_NL;
1124
1125         cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
1126         hnode = (version == cfs_hash_bd_version_get(&bd)) ?  NULL :
1127                 cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1128
1129         if (hnode != NULL) {
1130                 /* Someone won the race and already added the resource. */
1131                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1132                 /* Clean lu_ref for failed resource. */
1133                 lu_ref_fini(&res->lr_reference);
1134                 /* We have taken lr_lvb_mutex. Drop it. */
1135                 mutex_unlock(&res->lr_lvb_mutex);
1136                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1137
1138                 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
1139                 /* Synchronize with regard to resource creation. */
1140                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1141                         mutex_lock(&res->lr_lvb_mutex);
1142                         mutex_unlock(&res->lr_lvb_mutex);
1143                 }
1144                 return res;
1145         }
1146         /* We won! Let's add the resource. */
1147         cfs_hash_bd_add_locked(ns->ns_rs_hash, &bd, &res->lr_hash);
1148         if (cfs_hash_bd_count_get(&bd) == 1)
1149                 ldlm_namespace_get(ns);
1150
1151         cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1152         if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1153                 int rc;
1154
1155                 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CREATE_RESOURCE, 2);
1156                 rc = ns->ns_lvbo->lvbo_init(res);
1157                 if (rc)
1158                         CERROR("lvbo_init failed for resource "
1159                                LPU64": rc %d\n", name->name[0], rc);
1160         }
1161
1162         /* We create resource with locked lr_lvb_mutex. */
1163         mutex_unlock(&res->lr_lvb_mutex);
1164
1165         return res;
1166 }
1167 EXPORT_SYMBOL(ldlm_resource_get);
1168
1169 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res)
1170 {
1171         LASSERT(res != NULL);
1172         LASSERT(res != LP_POISON);
1173         cfs_atomic_inc(&res->lr_refcount);
1174         CDEBUG(D_INFO, "getref res: %p count: %d\n", res,
1175                cfs_atomic_read(&res->lr_refcount));
1176         return res;
1177 }
1178
1179 static void __ldlm_resource_putref_final(cfs_hash_bd_t *bd,
1180                                          struct ldlm_resource *res)
1181 {
1182         struct ldlm_ns_bucket *nsb = res->lr_ns_bucket;
1183
1184         if (!cfs_list_empty(&res->lr_granted)) {
1185                 ldlm_resource_dump(D_ERROR, res);
1186                 LBUG();
1187         }
1188
1189         if (!cfs_list_empty(&res->lr_converting)) {
1190                 ldlm_resource_dump(D_ERROR, res);
1191                 LBUG();
1192         }
1193
1194         if (!cfs_list_empty(&res->lr_waiting)) {
1195                 ldlm_resource_dump(D_ERROR, res);
1196                 LBUG();
1197         }
1198
1199         cfs_hash_bd_del_locked(nsb->nsb_namespace->ns_rs_hash,
1200                                bd, &res->lr_hash);
1201         lu_ref_fini(&res->lr_reference);
1202         if (cfs_hash_bd_count_get(bd) == 0)
1203                 ldlm_namespace_put(nsb->nsb_namespace);
1204 }
1205
1206 /* Returns 1 if the resource was freed, 0 if it remains. */
1207 int ldlm_resource_putref(struct ldlm_resource *res)
1208 {
1209         struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1210         cfs_hash_bd_t   bd;
1211
1212         LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
1213         CDEBUG(D_INFO, "putref res: %p count: %d\n",
1214                res, cfs_atomic_read(&res->lr_refcount) - 1);
1215
1216         cfs_hash_bd_get(ns->ns_rs_hash, &res->lr_name, &bd);
1217         if (cfs_hash_bd_dec_and_lock(ns->ns_rs_hash, &bd, &res->lr_refcount)) {
1218                 __ldlm_resource_putref_final(&bd, res);
1219                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1220                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
1221                         ns->ns_lvbo->lvbo_free(res);
1222                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1223                 return 1;
1224         }
1225         return 0;
1226 }
1227 EXPORT_SYMBOL(ldlm_resource_putref);
1228
1229 /* Returns 1 if the resource was freed, 0 if it remains. */
1230 int ldlm_resource_putref_locked(struct ldlm_resource *res)
1231 {
1232         struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1233
1234         LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
1235         CDEBUG(D_INFO, "putref res: %p count: %d\n",
1236                res, cfs_atomic_read(&res->lr_refcount) - 1);
1237
1238         if (cfs_atomic_dec_and_test(&res->lr_refcount)) {
1239                 cfs_hash_bd_t bd;
1240
1241                 cfs_hash_bd_get(ldlm_res_to_ns(res)->ns_rs_hash,
1242                                 &res->lr_name, &bd);
1243                 __ldlm_resource_putref_final(&bd, res);
1244                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1245                 /* NB: ns_rs_hash is created with CFS_HASH_NO_ITEMREF,
1246                  * so we should never be here while calling cfs_hash_del,
1247                  * cfs_hash_for_each_nolock is the only case we can get
1248                  * here, which is safe to release cfs_hash_bd_lock.
1249                  */
1250                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
1251                         ns->ns_lvbo->lvbo_free(res);
1252                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1253
1254                 cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
1255                 return 1;
1256         }
1257         return 0;
1258 }
1259
1260 /**
1261  * Add a lock into a given resource into specified lock list.
1262  */
1263 void ldlm_resource_add_lock(struct ldlm_resource *res, cfs_list_t *head,
1264                             struct ldlm_lock *lock)
1265 {
1266         check_res_locked(res);
1267
1268         LDLM_DEBUG(lock, "About to add this lock:\n");
1269
1270         if (lock->l_destroyed) {
1271                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1272                 return;
1273         }
1274
1275         LASSERT(cfs_list_empty(&lock->l_res_link));
1276
1277         cfs_list_add_tail(&lock->l_res_link, head);
1278 }
1279
1280 /**
1281  * Insert a lock into resource after specified lock.
1282  *
1283  * Obtain resource description from the lock we are inserting after.
1284  */
1285 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
1286                                      struct ldlm_lock *new)
1287 {
1288         struct ldlm_resource *res = original->l_resource;
1289
1290         check_res_locked(res);
1291
1292         ldlm_resource_dump(D_INFO, res);
1293         LDLM_DEBUG(new, "About to insert this lock after %p:\n", original);
1294
1295         if (new->l_destroyed) {
1296                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1297                 goto out;
1298         }
1299
1300         LASSERT(cfs_list_empty(&new->l_res_link));
1301
1302         cfs_list_add(&new->l_res_link, &original->l_res_link);
1303  out:;
1304 }
1305
1306 void ldlm_resource_unlink_lock(struct ldlm_lock *lock)
1307 {
1308         int type = lock->l_resource->lr_type;
1309
1310         check_res_locked(lock->l_resource);
1311         if (type == LDLM_IBITS || type == LDLM_PLAIN)
1312                 ldlm_unlink_lock_skiplist(lock);
1313         else if (type == LDLM_EXTENT)
1314                 ldlm_extent_unlink_lock(lock);
1315         cfs_list_del_init(&lock->l_res_link);
1316 }
1317 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
1318
1319 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc)
1320 {
1321         desc->lr_type = res->lr_type;
1322         desc->lr_name = res->lr_name;
1323 }
1324
1325 /**
1326  * Print information about all locks in all namespaces on this node to debug
1327  * log.
1328  */
1329 void ldlm_dump_all_namespaces(ldlm_side_t client, int level)
1330 {
1331         cfs_list_t *tmp;
1332
1333         if (!((libcfs_debug | D_ERROR) & level))
1334                 return;
1335
1336         mutex_lock(ldlm_namespace_lock(client));
1337
1338         cfs_list_for_each(tmp, ldlm_namespace_list(client)) {
1339                 struct ldlm_namespace *ns;
1340                 ns = cfs_list_entry(tmp, struct ldlm_namespace, ns_list_chain);
1341                 ldlm_namespace_dump(level, ns);
1342         }
1343
1344         mutex_unlock(ldlm_namespace_lock(client));
1345 }
1346 EXPORT_SYMBOL(ldlm_dump_all_namespaces);
1347
1348 static int ldlm_res_hash_dump(cfs_hash_t *hs, cfs_hash_bd_t *bd,
1349                               cfs_hlist_node_t *hnode, void *arg)
1350 {
1351         struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1352         int    level = (int)(unsigned long)arg;
1353
1354         lock_res(res);
1355         ldlm_resource_dump(level, res);
1356         unlock_res(res);
1357
1358         return 0;
1359 }
1360
1361 /**
1362  * Print information about all locks in this namespace on this node to debug
1363  * log.
1364  */
1365 void ldlm_namespace_dump(int level, struct ldlm_namespace *ns)
1366 {
1367         if (!((libcfs_debug | D_ERROR) & level))
1368                 return;
1369
1370         CDEBUG(level, "--- Namespace: %s (rc: %d, side: %s)\n",
1371                ldlm_ns_name(ns), cfs_atomic_read(&ns->ns_bref),
1372                ns_is_client(ns) ? "client" : "server");
1373
1374         if (cfs_time_before(cfs_time_current(), ns->ns_next_dump))
1375                 return;
1376
1377         cfs_hash_for_each_nolock(ns->ns_rs_hash,
1378                                  ldlm_res_hash_dump,
1379                                  (void *)(unsigned long)level);
1380         spin_lock(&ns->ns_lock);
1381         ns->ns_next_dump = cfs_time_shift(10);
1382         spin_unlock(&ns->ns_lock);
1383 }
1384 EXPORT_SYMBOL(ldlm_namespace_dump);
1385
1386 /**
1387  * Print information about all locks in this resource to debug log.
1388  */
1389 void ldlm_resource_dump(int level, struct ldlm_resource *res)
1390 {
1391         struct ldlm_lock *lock;
1392         unsigned int granted = 0;
1393
1394         CLASSERT(RES_NAME_SIZE == 4);
1395
1396         if (!((libcfs_debug | D_ERROR) & level))
1397                 return;
1398
1399         CDEBUG(level, "--- Resource: %p ("LPU64"/"LPU64"/"LPU64"/"LPU64
1400                ") (rc: %d)\n", res, res->lr_name.name[0], res->lr_name.name[1],
1401                res->lr_name.name[2], res->lr_name.name[3],
1402                cfs_atomic_read(&res->lr_refcount));
1403
1404         if (!cfs_list_empty(&res->lr_granted)) {
1405                 CDEBUG(level, "Granted locks (in reverse order):\n");
1406                 cfs_list_for_each_entry_reverse(lock, &res->lr_granted,
1407                                                 l_res_link) {
1408                         LDLM_DEBUG_LIMIT(level, lock, "###");
1409                         if (!(level & D_CANTMASK) &&
1410                             ++granted > ldlm_dump_granted_max) {
1411                                 CDEBUG(level, "only dump %d granted locks to "
1412                                        "avoid DDOS.\n", granted);
1413                                 break;
1414                         }
1415                 }
1416         }
1417         if (!cfs_list_empty(&res->lr_converting)) {
1418                 CDEBUG(level, "Converting locks:\n");
1419                 cfs_list_for_each_entry(lock, &res->lr_converting, l_res_link)
1420                         LDLM_DEBUG_LIMIT(level, lock, "###");
1421         }
1422         if (!cfs_list_empty(&res->lr_waiting)) {
1423                 CDEBUG(level, "Waiting locks:\n");
1424                 cfs_list_for_each_entry(lock, &res->lr_waiting, l_res_link)
1425                         LDLM_DEBUG_LIMIT(level, lock, "###");
1426         }
1427 }