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, 2013, 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, 0,
 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, 0, 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, LCF_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, LCF_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, LCF_ASYNC);
 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         lock_res(res);
 801         CERROR("%s: namespace resource "DLDLMRES" (%p) refcount nonzero "
 802                "(%d) after lock cleanup; forcing cleanup.\n",
 803                ldlm_ns_name(ldlm_res_to_ns(res)), PLDLMRES(res), res,
 804                cfs_atomic_read(&res->lr_refcount) - 1);
 805
 806         ldlm_resource_dump(D_ERROR, res);
 807         unlock_res(res);
 808         return 0;
 809 }
 810
 811 /**
 812  * Cancel and destroy all locks in the namespace.
 813  *
 814  * Typically used during evictions when server notified client that it was
 815  * evicted and all of its state needs to be destroyed.
 816  * Also used during shutdown.
 817  */
 818 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, __u64 flags)
 819 {
 820         if (ns == NULL) {
 821                 CDEBUG(D_INFO, "NULL ns, skipping cleanup\n");
 822                 return ELDLM_OK;
 823         }
 824
 825         cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_clean, &flags);
 826         cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_complain, NULL);
 827         return ELDLM_OK;
 828 }
 829 EXPORT_SYMBOL(ldlm_namespace_cleanup);
 830
 831 /**
 832  * Attempts to free namespace.
 833  *
 834  * Only used when namespace goes away, like during an unmount.
 835  */
 836 static int __ldlm_namespace_free(struct ldlm_namespace *ns, int force)
 837 {
 838         ENTRY;
 839
 840         /* At shutdown time, don't call the cancellation callback */
 841         ldlm_namespace_cleanup(ns, force ? LDLM_FL_LOCAL_ONLY : 0);
 842
 843         if (cfs_atomic_read(&ns->ns_bref) > 0) {
 844                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 845                 int rc;
 846                 CDEBUG(D_DLMTRACE,
 847                        "dlm namespace %s free waiting on refcount %d\n",
 848                        ldlm_ns_name(ns), cfs_atomic_read(&ns->ns_bref));
 849 force_wait:
 850                 if (force)
 851                         lwi = LWI_TIMEOUT(obd_timeout * CFS_HZ / 4, NULL, NULL);
 852
 853                 rc = l_wait_event(ns->ns_waitq,
 854                                   cfs_atomic_read(&ns->ns_bref) == 0, &lwi);
 855
 856                 /* Forced cleanups should be able to reclaim all references,
 857                  * so it's safe to wait forever... we can't leak locks... */
 858                 if (force && rc == -ETIMEDOUT) {
 859                         LCONSOLE_ERROR("Forced cleanup waiting for %s "
 860                                        "namespace with %d resources in use, "
 861                                        "(rc=%d)\n", ldlm_ns_name(ns),
 862                                        cfs_atomic_read(&ns->ns_bref), rc);
 863                         GOTO(force_wait, rc);
 864                 }
 865
 866                 if (cfs_atomic_read(&ns->ns_bref)) {
 867                         LCONSOLE_ERROR("Cleanup waiting for %s namespace "
 868                                        "with %d resources in use, (rc=%d)\n",
 869                                        ldlm_ns_name(ns),
 870                                        cfs_atomic_read(&ns->ns_bref), rc);
 871                         RETURN(ELDLM_NAMESPACE_EXISTS);
 872                 }
 873                 CDEBUG(D_DLMTRACE, "dlm namespace %s free done waiting\n",
 874                        ldlm_ns_name(ns));
 875         }
 876
 877         RETURN(ELDLM_OK);
 878 }
 879
 880 /**
 881  * Performs various cleanups for passed \a ns to make it drop refc and be
 882  * ready for freeing. Waits for refc == 0.
 883  *
 884  * The following is done:
 885  * (0) Unregister \a ns from its list to make inaccessible for potential
 886  * users like pools thread and others;
 887  * (1) Clear all locks in \a ns.
 888  */
 889 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
 890                                struct obd_import *imp,
 891                                int force)
 892 {
 893         int rc;
 894         ENTRY;
 895         if (!ns) {
 896                 EXIT;
 897                 return;
 898         }
 899
 900         spin_lock(&ns->ns_lock);
 901         ns->ns_stopping = 1;
 902         spin_unlock(&ns->ns_lock);
 903
 904         /*
 905          * Can fail with -EINTR when force == 0 in which case try harder.
 906          */
 907         rc = __ldlm_namespace_free(ns, force);
 908         if (rc != ELDLM_OK) {
 909                 if (imp) {
 910                         ptlrpc_disconnect_import(imp, 0);
 911                         ptlrpc_invalidate_import(imp);
 912                 }
 913
 914                 /*
 915                  * With all requests dropped and the import inactive
 916                  * we are gaurenteed all reference will be dropped.
 917                  */
 918                 rc = __ldlm_namespace_free(ns, 1);
 919                 LASSERT(rc == 0);
 920         }
 921         EXIT;
 922 }
 923
 924 /**
 925  * Performs freeing memory structures related to \a ns. This is only done
 926  * when ldlm_namespce_free_prior() successfully removed all resources
 927  * referencing \a ns and its refc == 0.
 928  */
 929 void ldlm_namespace_free_post(struct ldlm_namespace *ns)
 930 {
 931         ENTRY;
 932         if (!ns) {
 933                 EXIT;
 934                 return;
 935         }
 936
 937         /* Make sure that nobody can find this ns in its list. */
 938         ldlm_namespace_unregister(ns, ns->ns_client);
 939         /* Fini pool _before_ parent proc dir is removed. This is important as
 940          * ldlm_pool_fini() removes own proc dir which is child to @dir.
 941          * Removing it after @dir may cause oops. */
 942         ldlm_pool_fini(&ns->ns_pool);
 943
 944         ldlm_namespace_proc_unregister(ns);
 945         cfs_hash_putref(ns->ns_rs_hash);
 946         /* Namespace \a ns should be not on list at this time, otherwise
 947          * this will cause issues related to using freed \a ns in poold
 948          * thread. */
 949         LASSERT(cfs_list_empty(&ns->ns_list_chain));
 950         OBD_FREE_PTR(ns);
 951         ldlm_put_ref();
 952         EXIT;
 953 }
 954
 955 /**
 956  * Cleanup the resource, and free namespace.
 957  * bug 12864:
 958  * Deadlock issue:
 959  * proc1: destroy import
 960  *        class_disconnect_export(grab cl_sem) ->
 961  *              -> ldlm_namespace_free ->
 962  *              -> lprocfs_remove(grab _lprocfs_lock).
 963  * proc2: read proc info
 964  *        lprocfs_fops_read(grab _lprocfs_lock) ->
 965  *              -> osc_rd_active, etc(grab cl_sem).
 966  *
 967  * So that I have to split the ldlm_namespace_free into two parts - the first
 968  * part ldlm_namespace_free_prior is used to cleanup the resource which is
 969  * being used; the 2nd part ldlm_namespace_free_post is used to unregister the
 970  * lprocfs entries, and then free memory. It will be called w/o cli->cl_sem
 971  * held.
 972  */
 973 void ldlm_namespace_free(struct ldlm_namespace *ns,
 974                          struct obd_import *imp,
 975                          int force)
 976 {
 977         ldlm_namespace_free_prior(ns, imp, force);
 978         ldlm_namespace_free_post(ns);
 979 }
 980 EXPORT_SYMBOL(ldlm_namespace_free);
 981
 982 void ldlm_namespace_get(struct ldlm_namespace *ns)
 983 {
 984         cfs_atomic_inc(&ns->ns_bref);
 985 }
 986 EXPORT_SYMBOL(ldlm_namespace_get);
 987
 988 void ldlm_namespace_put(struct ldlm_namespace *ns)
 989 {
 990         if (cfs_atomic_dec_and_lock(&ns->ns_bref, &ns->ns_lock)) {
 991                 cfs_waitq_signal(&ns->ns_waitq);
 992                 spin_unlock(&ns->ns_lock);
 993         }
 994 }
 995 EXPORT_SYMBOL(ldlm_namespace_put);
 996
 997 /** Register \a ns in the list of namespaces */
 998 void ldlm_namespace_register(struct ldlm_namespace *ns, ldlm_side_t client)
 999 {
1000         mutex_lock(ldlm_namespace_lock(client));
1001         LASSERT(cfs_list_empty(&ns->ns_list_chain));
1002         cfs_list_add(&ns->ns_list_chain, ldlm_namespace_list(client));
1003         cfs_atomic_inc(ldlm_namespace_nr(client));
1004         mutex_unlock(ldlm_namespace_lock(client));
1005 }
1006
1007 /** Unregister \a ns from the list of namespaces. */
1008 void ldlm_namespace_unregister(struct ldlm_namespace *ns, ldlm_side_t client)
1009 {
1010         mutex_lock(ldlm_namespace_lock(client));
1011         LASSERT(!cfs_list_empty(&ns->ns_list_chain));
1012         /* Some asserts and possibly other parts of the code are still
1013          * using list_empty(&ns->ns_list_chain). This is why it is
1014          * important to use list_del_init() here. */
1015         cfs_list_del_init(&ns->ns_list_chain);
1016         cfs_atomic_dec(ldlm_namespace_nr(client));
1017         mutex_unlock(ldlm_namespace_lock(client));
1018 }
1019
1020 /** Should be called with ldlm_namespace_lock(client) taken. */
1021 void ldlm_namespace_move_locked(struct ldlm_namespace *ns, ldlm_side_t client)
1022 {
1023         LASSERT(!cfs_list_empty(&ns->ns_list_chain));
1024         LASSERT_MUTEX_LOCKED(ldlm_namespace_lock(client));
1025         cfs_list_move_tail(&ns->ns_list_chain, ldlm_namespace_list(client));
1026 }
1027
1028 /** Should be called with ldlm_namespace_lock(client) taken. */
1029 struct ldlm_namespace *ldlm_namespace_first_locked(ldlm_side_t client)
1030 {
1031         LASSERT_MUTEX_LOCKED(ldlm_namespace_lock(client));
1032         LASSERT(!cfs_list_empty(ldlm_namespace_list(client)));
1033         return container_of(ldlm_namespace_list(client)->next,
1034                 struct ldlm_namespace, ns_list_chain);
1035 }
1036
1037 /** Create and initialize new resource. */
1038 static struct ldlm_resource *ldlm_resource_new(void)
1039 {
1040         struct ldlm_resource *res;
1041         int idx;
1042
1043         OBD_SLAB_ALLOC_PTR_GFP(res, ldlm_resource_slab, CFS_ALLOC_IO);
1044         if (res == NULL)
1045                 return NULL;
1046
1047         CFS_INIT_LIST_HEAD(&res->lr_granted);
1048         CFS_INIT_LIST_HEAD(&res->lr_converting);
1049         CFS_INIT_LIST_HEAD(&res->lr_waiting);
1050
1051         /* Initialize interval trees for each lock mode. */
1052         for (idx = 0; idx < LCK_MODE_NUM; idx++) {
1053                 res->lr_itree[idx].lit_size = 0;
1054                 res->lr_itree[idx].lit_mode = 1 << idx;
1055                 res->lr_itree[idx].lit_root = NULL;
1056         }
1057
1058         cfs_atomic_set(&res->lr_refcount, 1);
1059         spin_lock_init(&res->lr_lock);
1060         lu_ref_init(&res->lr_reference);
1061
1062         /* The creator of the resource must unlock the mutex after LVB
1063          * initialization. */
1064         mutex_init(&res->lr_lvb_mutex);
1065         mutex_lock(&res->lr_lvb_mutex);
1066
1067         return res;
1068 }
1069
1070 /**
1071  * Return a reference to resource with given name, creating it if necessary.
1072  * Args: namespace with ns_lock unlocked
1073  * Locks: takes and releases NS hash-lock and res->lr_lock
1074  * Returns: referenced, unlocked ldlm_resource or NULL
1075  */
1076 struct ldlm_resource *
1077 ldlm_resource_get(struct ldlm_namespace *ns, struct ldlm_resource *parent,
1078                   const struct ldlm_res_id *name, ldlm_type_t type, int create)
1079 {
1080         cfs_hlist_node_t     *hnode;
1081         struct ldlm_resource *res;
1082         cfs_hash_bd_t         bd;
1083         __u64                 version;
1084
1085         LASSERT(ns != NULL);
1086         LASSERT(parent == NULL);
1087         LASSERT(ns->ns_rs_hash != NULL);
1088         LASSERT(name->name[0] != 0);
1089
1090         cfs_hash_bd_get_and_lock(ns->ns_rs_hash, (void *)name, &bd, 0);
1091         hnode = cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
1092         if (hnode != NULL) {
1093                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
1094                 res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
1095                 /* Synchronize with regard to resource creation. */
1096                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1097                         mutex_lock(&res->lr_lvb_mutex);
1098                         mutex_unlock(&res->lr_lvb_mutex);
1099                 }
1100
1101                 if (unlikely(res->lr_lvb_len < 0)) {
1102                         ldlm_resource_putref(res);
1103                         res = NULL;
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
1145                 if (unlikely(res->lr_lvb_len < 0)) {
1146                         ldlm_resource_putref(res);
1147                         res = NULL;
1148                 }
1149                 return res;
1150         }
1151         /* We won! Let's add the resource. */
1152         cfs_hash_bd_add_locked(ns->ns_rs_hash, &bd, &res->lr_hash);
1153         if (cfs_hash_bd_count_get(&bd) == 1)
1154                 ldlm_namespace_get(ns);
1155
1156         cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1157         if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
1158                 int rc;
1159
1160                 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CREATE_RESOURCE, 2);
1161                 rc = ns->ns_lvbo->lvbo_init(res);
1162                 if (rc < 0) {
1163                         CERROR("%s: lvbo_init failed for resource "LPX64":"
1164                                LPX64": rc = %d\n", ns->ns_obd->obd_name,
1165                                name->name[0], name->name[1], rc);
1166                         if (res->lr_lvb_data) {
1167                                 OBD_FREE(res->lr_lvb_data, res->lr_lvb_len);
1168                                 res->lr_lvb_data = NULL;
1169                         }
1170                         res->lr_lvb_len = rc;
1171                         mutex_unlock(&res->lr_lvb_mutex);
1172                         ldlm_resource_putref(res);
1173                         return NULL;
1174                 }
1175         }
1176
1177         /* We create resource with locked lr_lvb_mutex. */
1178         mutex_unlock(&res->lr_lvb_mutex);
1179
1180         return res;
1181 }
1182 EXPORT_SYMBOL(ldlm_resource_get);
1183
1184 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res)
1185 {
1186         LASSERT(res != NULL);
1187         LASSERT(res != LP_POISON);
1188         cfs_atomic_inc(&res->lr_refcount);
1189         CDEBUG(D_INFO, "getref res: %p count: %d\n", res,
1190                cfs_atomic_read(&res->lr_refcount));
1191         return res;
1192 }
1193
1194 static void __ldlm_resource_putref_final(cfs_hash_bd_t *bd,
1195                                          struct ldlm_resource *res)
1196 {
1197         struct ldlm_ns_bucket *nsb = res->lr_ns_bucket;
1198
1199         if (!cfs_list_empty(&res->lr_granted)) {
1200                 ldlm_resource_dump(D_ERROR, res);
1201                 LBUG();
1202         }
1203
1204         if (!cfs_list_empty(&res->lr_converting)) {
1205                 ldlm_resource_dump(D_ERROR, res);
1206                 LBUG();
1207         }
1208
1209         if (!cfs_list_empty(&res->lr_waiting)) {
1210                 ldlm_resource_dump(D_ERROR, res);
1211                 LBUG();
1212         }
1213
1214         cfs_hash_bd_del_locked(nsb->nsb_namespace->ns_rs_hash,
1215                                bd, &res->lr_hash);
1216         lu_ref_fini(&res->lr_reference);
1217         if (cfs_hash_bd_count_get(bd) == 0)
1218                 ldlm_namespace_put(nsb->nsb_namespace);
1219 }
1220
1221 /* Returns 1 if the resource was freed, 0 if it remains. */
1222 int ldlm_resource_putref(struct ldlm_resource *res)
1223 {
1224         struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1225         cfs_hash_bd_t   bd;
1226
1227         LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
1228         CDEBUG(D_INFO, "putref res: %p count: %d\n",
1229                res, cfs_atomic_read(&res->lr_refcount) - 1);
1230
1231         cfs_hash_bd_get(ns->ns_rs_hash, &res->lr_name, &bd);
1232         if (cfs_hash_bd_dec_and_lock(ns->ns_rs_hash, &bd, &res->lr_refcount)) {
1233                 __ldlm_resource_putref_final(&bd, res);
1234                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1235                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
1236                         ns->ns_lvbo->lvbo_free(res);
1237                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1238                 return 1;
1239         }
1240         return 0;
1241 }
1242 EXPORT_SYMBOL(ldlm_resource_putref);
1243
1244 /* Returns 1 if the resource was freed, 0 if it remains. */
1245 int ldlm_resource_putref_locked(struct ldlm_resource *res)
1246 {
1247         struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1248
1249         LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
1250         CDEBUG(D_INFO, "putref res: %p count: %d\n",
1251                res, cfs_atomic_read(&res->lr_refcount) - 1);
1252
1253         if (cfs_atomic_dec_and_test(&res->lr_refcount)) {
1254                 cfs_hash_bd_t bd;
1255
1256                 cfs_hash_bd_get(ldlm_res_to_ns(res)->ns_rs_hash,
1257                                 &res->lr_name, &bd);
1258                 __ldlm_resource_putref_final(&bd, res);
1259                 cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
1260                 /* NB: ns_rs_hash is created with CFS_HASH_NO_ITEMREF,
1261                  * so we should never be here while calling cfs_hash_del,
1262                  * cfs_hash_for_each_nolock is the only case we can get
1263                  * here, which is safe to release cfs_hash_bd_lock.
1264                  */
1265                 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
1266                         ns->ns_lvbo->lvbo_free(res);
1267                 OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
1268
1269                 cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
1270                 return 1;
1271         }
1272         return 0;
1273 }
1274
1275 /**
1276  * Add a lock into a given resource into specified lock list.
1277  */
1278 void ldlm_resource_add_lock(struct ldlm_resource *res, cfs_list_t *head,
1279                             struct ldlm_lock *lock)
1280 {
1281         check_res_locked(res);
1282
1283         LDLM_DEBUG(lock, "About to add this lock:\n");
1284
1285         if (lock->l_destroyed) {
1286                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1287                 return;
1288         }
1289
1290         LASSERT(cfs_list_empty(&lock->l_res_link));
1291
1292         cfs_list_add_tail(&lock->l_res_link, head);
1293 }
1294
1295 /**
1296  * Insert a lock into resource after specified lock.
1297  *
1298  * Obtain resource description from the lock we are inserting after.
1299  */
1300 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
1301                                      struct ldlm_lock *new)
1302 {
1303         struct ldlm_resource *res = original->l_resource;
1304
1305         check_res_locked(res);
1306
1307         ldlm_resource_dump(D_INFO, res);
1308         LDLM_DEBUG(new, "About to insert this lock after %p:\n", original);
1309
1310         if (new->l_destroyed) {
1311                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
1312                 goto out;
1313         }
1314
1315         LASSERT(cfs_list_empty(&new->l_res_link));
1316
1317         cfs_list_add(&new->l_res_link, &original->l_res_link);
1318  out:;
1319 }
1320
1321 void ldlm_resource_unlink_lock(struct ldlm_lock *lock)
1322 {
1323         int type = lock->l_resource->lr_type;
1324
1325         check_res_locked(lock->l_resource);
1326         if (type == LDLM_IBITS || type == LDLM_PLAIN)
1327                 ldlm_unlink_lock_skiplist(lock);
1328         else if (type == LDLM_EXTENT)
1329                 ldlm_extent_unlink_lock(lock);
1330         cfs_list_del_init(&lock->l_res_link);
1331 }
1332 EXPORT_SYMBOL(ldlm_resource_unlink_lock);
1333
1334 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc)
1335 {
1336         desc->lr_type = res->lr_type;
1337         desc->lr_name = res->lr_name;
1338 }
1339
1340 /**
1341  * Print information about all locks in all namespaces on this node to debug
1342  * log.
1343  */
1344 void ldlm_dump_all_namespaces(ldlm_side_t client, int level)
1345 {
1346         cfs_list_t *tmp;
1347
1348         if (!((libcfs_debug | D_ERROR) & level))
1349                 return;
1350
1351         mutex_lock(ldlm_namespace_lock(client));
1352
1353         cfs_list_for_each(tmp, ldlm_namespace_list(client)) {
1354                 struct ldlm_namespace *ns;
1355                 ns = cfs_list_entry(tmp, struct ldlm_namespace, ns_list_chain);
1356                 ldlm_namespace_dump(level, ns);
1357         }
1358
1359         mutex_unlock(ldlm_namespace_lock(client));
1360 }
1361 EXPORT_SYMBOL(ldlm_dump_all_namespaces);
1362
1363 static int ldlm_res_hash_dump(cfs_hash_t *hs, cfs_hash_bd_t *bd,
1364                               cfs_hlist_node_t *hnode, void *arg)
1365 {
1366         struct ldlm_resource *res = cfs_hash_object(hs, hnode);
1367         int    level = (int)(unsigned long)arg;
1368
1369         lock_res(res);
1370         ldlm_resource_dump(level, res);
1371         unlock_res(res);
1372
1373         return 0;
1374 }
1375
1376 /**
1377  * Print information about all locks in this namespace on this node to debug
1378  * log.
1379  */
1380 void ldlm_namespace_dump(int level, struct ldlm_namespace *ns)
1381 {
1382         if (!((libcfs_debug | D_ERROR) & level))
1383                 return;
1384
1385         CDEBUG(level, "--- Namespace: %s (rc: %d, side: %s)\n",
1386                ldlm_ns_name(ns), cfs_atomic_read(&ns->ns_bref),
1387                ns_is_client(ns) ? "client" : "server");
1388
1389         if (cfs_time_before(cfs_time_current(), ns->ns_next_dump))
1390                 return;
1391
1392         cfs_hash_for_each_nolock(ns->ns_rs_hash,
1393                                  ldlm_res_hash_dump,
1394                                  (void *)(unsigned long)level);
1395         spin_lock(&ns->ns_lock);
1396         ns->ns_next_dump = cfs_time_shift(10);
1397         spin_unlock(&ns->ns_lock);
1398 }
1399 EXPORT_SYMBOL(ldlm_namespace_dump);
1400
1401 /**
1402  * Print information about all locks in this resource to debug log.
1403  */
1404 void ldlm_resource_dump(int level, struct ldlm_resource *res)
1405 {
1406         struct ldlm_lock *lock;
1407         unsigned int granted = 0;
1408
1409         CLASSERT(RES_NAME_SIZE == 4);
1410
1411         if (!((libcfs_debug | D_ERROR) & level))
1412                 return;
1413
1414         CDEBUG(level, "--- Resource: "DLDLMRES" (%p) refcount = %d\n",
1415                PLDLMRES(res), res, cfs_atomic_read(&res->lr_refcount));
1416
1417         if (!cfs_list_empty(&res->lr_granted)) {
1418                 CDEBUG(level, "Granted locks (in reverse order):\n");
1419                 cfs_list_for_each_entry_reverse(lock, &res->lr_granted,
1420                                                 l_res_link) {
1421                         LDLM_DEBUG_LIMIT(level, lock, "###");
1422                         if (!(level & D_CANTMASK) &&
1423                             ++granted > ldlm_dump_granted_max) {
1424                                 CDEBUG(level, "only dump %d granted locks to "
1425                                        "avoid DDOS.\n", granted);
1426                                 break;
1427                         }
1428                 }
1429         }
1430         if (!cfs_list_empty(&res->lr_converting)) {
1431                 CDEBUG(level, "Converting locks:\n");
1432                 cfs_list_for_each_entry(lock, &res->lr_converting, l_res_link)
1433                         LDLM_DEBUG_LIMIT(level, lock, "###");
1434         }
1435         if (!cfs_list_empty(&res->lr_waiting)) {
1436                 CDEBUG(level, "Waiting locks:\n");
1437                 cfs_list_for_each_entry(lock, &res->lr_waiting, l_res_link)
1438                         LDLM_DEBUG_LIMIT(level, lock, "###");
1439         }
1440 }