lustre/lfsck/lfsck_lib.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,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.  A copy is
  14  * included in the COPYING file that accompanied this code.
  15
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2012, 2013, Intel Corporation.
  24  */
  25 /*
  26  * lustre/lfsck/lfsck_lib.c
  27  *
  28  * Author: Fan, Yong <fan.yong@intel.com>
  29  */
  30
  31 #define DEBUG_SUBSYSTEM S_LFSCK
  32
  33 #include <libcfs/list.h>
  34 #include <lu_object.h>
  35 #include <dt_object.h>
  36 #include <md_object.h>
  37 #include <lustre_fld.h>
  38 #include <lustre_lib.h>
  39 #include <lustre_net.h>
  40 #include <lustre_lfsck.h>
  41 #include <lustre/lustre_lfsck_user.h>
  42
  43 #include "lfsck_internal.h"
  44
  45 /* define lfsck thread key */
  46 LU_KEY_INIT(lfsck, struct lfsck_thread_info);
  47
  48 static void lfsck_key_fini(const struct lu_context *ctx,
  49                            struct lu_context_key *key, void *data)
  50 {
  51         struct lfsck_thread_info *info = data;
  52
  53         lu_buf_free(&info->lti_linkea_buf);
  54         lu_buf_free(&info->lti_big_buf);
  55         OBD_FREE_PTR(info);
  56 }
  57
  58 LU_CONTEXT_KEY_DEFINE(lfsck, LCT_MD_THREAD | LCT_DT_THREAD);
  59 LU_KEY_INIT_GENERIC(lfsck);
  60
  61 static CFS_LIST_HEAD(lfsck_instance_list);
  62 static struct list_head lfsck_ost_orphan_list;
  63 static struct list_head lfsck_mdt_orphan_list;
  64 static DEFINE_SPINLOCK(lfsck_instance_lock);
  65
  66 static const char *lfsck_status_names[] = {
  67         [LS_INIT]               = "init",
  68         [LS_SCANNING_PHASE1]    = "scanning-phase1",
  69         [LS_SCANNING_PHASE2]    = "scanning-phase2",
  70         [LS_COMPLETED]          = "completed",
  71         [LS_FAILED]             = "failed",
  72         [LS_STOPPED]            = "stopped",
  73         [LS_PAUSED]             = "paused",
  74         [LS_CRASHED]            = "crashed",
  75         [LS_PARTIAL]            = "partial",
  76         [LS_CO_FAILED]          = "co-failed",
  77         [LS_CO_STOPPED]         = "co-stopped",
  78         [LS_CO_PAUSED]          = "co-paused"
  79 };
  80
  81 const char *lfsck_flags_names[] = {
  82         "scanned-once",
  83         "inconsistent",
  84         "upgrade",
  85         "incomplete",
  86         "crashed_lastid",
  87         NULL
  88 };
  89
  90 const char *lfsck_param_names[] = {
  91         NULL,
  92         "failout",
  93         "dryrun",
  94         "all_targets",
  95         NULL
  96 };
  97
  98 const char *lfsck_status2names(enum lfsck_status status)
  99 {
 100         if (unlikely(status < 0 || status >= LS_MAX))
 101                 return "unknown";
 102
 103         return lfsck_status_names[status];
 104 }
 105
 106 static int lfsck_tgt_descs_init(struct lfsck_tgt_descs *ltds)
 107 {
 108         spin_lock_init(&ltds->ltd_lock);
 109         init_rwsem(&ltds->ltd_rw_sem);
 110         INIT_LIST_HEAD(&ltds->ltd_orphan);
 111         ltds->ltd_tgts_bitmap = CFS_ALLOCATE_BITMAP(BITS_PER_LONG);
 112         if (ltds->ltd_tgts_bitmap == NULL)
 113                 return -ENOMEM;
 114
 115         return 0;
 116 }
 117
 118 static void lfsck_tgt_descs_fini(struct lfsck_tgt_descs *ltds)
 119 {
 120         struct lfsck_tgt_desc   *ltd;
 121         struct lfsck_tgt_desc   *next;
 122         int                      idx;
 123
 124         down_write(&ltds->ltd_rw_sem);
 125
 126         list_for_each_entry_safe(ltd, next, &ltds->ltd_orphan,
 127                                  ltd_orphan_list) {
 128                 list_del_init(&ltd->ltd_orphan_list);
 129                 lfsck_tgt_put(ltd);
 130         }
 131
 132         if (unlikely(ltds->ltd_tgts_bitmap == NULL)) {
 133                 up_write(&ltds->ltd_rw_sem);
 134
 135                 return;
 136         }
 137
 138         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
 139                 ltd = LTD_TGT(ltds, idx);
 140                 if (likely(ltd != NULL)) {
 141                         LASSERT(list_empty(&ltd->ltd_layout_list));
 142                         LASSERT(list_empty(&ltd->ltd_layout_phase_list));
 143
 144                         ltds->ltd_tgtnr--;
 145                         cfs_bitmap_clear(ltds->ltd_tgts_bitmap, idx);
 146                         LTD_TGT(ltds, idx) = NULL;
 147                         lfsck_tgt_put(ltd);
 148                 }
 149         }
 150
 151         LASSERTF(ltds->ltd_tgtnr == 0, "tgt count unmatched: %d\n",
 152                  ltds->ltd_tgtnr);
 153
 154         for (idx = 0; idx < TGT_PTRS; idx++) {
 155                 if (ltds->ltd_tgts_idx[idx] != NULL) {
 156                         OBD_FREE_PTR(ltds->ltd_tgts_idx[idx]);
 157                         ltds->ltd_tgts_idx[idx] = NULL;
 158                 }
 159         }
 160
 161         CFS_FREE_BITMAP(ltds->ltd_tgts_bitmap);
 162         ltds->ltd_tgts_bitmap = NULL;
 163         up_write(&ltds->ltd_rw_sem);
 164 }
 165
 166 static int __lfsck_add_target(const struct lu_env *env,
 167                               struct lfsck_instance *lfsck,
 168                               struct lfsck_tgt_desc *ltd,
 169                               bool for_ost, bool locked)
 170 {
 171         struct lfsck_tgt_descs *ltds;
 172         __u32                   index = ltd->ltd_index;
 173         int                     rc    = 0;
 174         ENTRY;
 175
 176         if (for_ost)
 177                 ltds = &lfsck->li_ost_descs;
 178         else
 179                 ltds = &lfsck->li_mdt_descs;
 180
 181         if (!locked)
 182                 down_write(&ltds->ltd_rw_sem);
 183
 184         LASSERT(ltds->ltd_tgts_bitmap != NULL);
 185
 186         if (index >= ltds->ltd_tgts_bitmap->size) {
 187                 __u32 newsize = max((__u32)ltds->ltd_tgts_bitmap->size,
 188                                     (__u32)BITS_PER_LONG);
 189                 cfs_bitmap_t *old_bitmap = ltds->ltd_tgts_bitmap;
 190                 cfs_bitmap_t *new_bitmap;
 191
 192                 while (newsize < index + 1)
 193                         newsize <<= 1;
 194
 195                 new_bitmap = CFS_ALLOCATE_BITMAP(newsize);
 196                 if (new_bitmap == NULL)
 197                         GOTO(unlock, rc = -ENOMEM);
 198
 199                 if (ltds->ltd_tgtnr > 0)
 200                         cfs_bitmap_copy(new_bitmap, old_bitmap);
 201                 ltds->ltd_tgts_bitmap = new_bitmap;
 202                 CFS_FREE_BITMAP(old_bitmap);
 203         }
 204
 205         if (cfs_bitmap_check(ltds->ltd_tgts_bitmap, index)) {
 206                 CERROR("%s: the device %s (%u) is registered already\n",
 207                        lfsck_lfsck2name(lfsck),
 208                        ltd->ltd_tgt->dd_lu_dev.ld_obd->obd_name, index);
 209                 GOTO(unlock, rc = -EEXIST);
 210         }
 211
 212         if (ltds->ltd_tgts_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
 213                 OBD_ALLOC_PTR(ltds->ltd_tgts_idx[index / TGT_PTRS_PER_BLOCK]);
 214                 if (ltds->ltd_tgts_idx[index / TGT_PTRS_PER_BLOCK] == NULL)
 215                         GOTO(unlock, rc = -ENOMEM);
 216         }
 217
 218         LTD_TGT(ltds, index) = ltd;
 219         cfs_bitmap_set(ltds->ltd_tgts_bitmap, index);
 220         ltds->ltd_tgtnr++;
 221
 222         GOTO(unlock, rc = 0);
 223
 224 unlock:
 225         if (!locked)
 226                 up_write(&ltds->ltd_rw_sem);
 227
 228         return rc;
 229 }
 230
 231 static int lfsck_add_target_from_orphan(const struct lu_env *env,
 232                                         struct lfsck_instance *lfsck)
 233 {
 234         struct lfsck_tgt_descs  *ltds    = &lfsck->li_ost_descs;
 235         struct lfsck_tgt_desc   *ltd;
 236         struct lfsck_tgt_desc   *next;
 237         struct list_head        *head    = &lfsck_ost_orphan_list;
 238         int                      rc;
 239         bool                     for_ost = true;
 240
 241 again:
 242         spin_lock(&lfsck_instance_lock);
 243         list_for_each_entry_safe(ltd, next, head, ltd_orphan_list) {
 244                 if (ltd->ltd_key == lfsck->li_bottom) {
 245                         list_del_init(&ltd->ltd_orphan_list);
 246                         list_add_tail(&ltd->ltd_orphan_list,
 247                                       &ltds->ltd_orphan);
 248                 }
 249         }
 250         spin_unlock(&lfsck_instance_lock);
 251
 252         down_write(&ltds->ltd_rw_sem);
 253         while (!list_empty(&ltds->ltd_orphan)) {
 254                 ltd = list_entry(ltds->ltd_orphan.next,
 255                                  struct lfsck_tgt_desc,
 256                                  ltd_orphan_list);
 257                 list_del_init(&ltd->ltd_orphan_list);
 258                 rc = __lfsck_add_target(env, lfsck, ltd, for_ost, true);
 259                 /* Do not hold the semaphore for too long time. */
 260                 up_write(&ltds->ltd_rw_sem);
 261                 if (rc != 0)
 262                         return rc;
 263
 264                 down_write(&ltds->ltd_rw_sem);
 265         }
 266         up_write(&ltds->ltd_rw_sem);
 267
 268         if (for_ost) {
 269                 ltds = &lfsck->li_mdt_descs;
 270                 head = &lfsck_mdt_orphan_list;
 271                 for_ost = false;
 272                 goto again;
 273         }
 274
 275         return 0;
 276 }
 277
 278 static inline struct lfsck_component *
 279 __lfsck_component_find(struct lfsck_instance *lfsck, __u16 type, cfs_list_t *list)
 280 {
 281         struct lfsck_component *com;
 282
 283         cfs_list_for_each_entry(com, list, lc_link) {
 284                 if (com->lc_type == type)
 285                         return com;
 286         }
 287         return NULL;
 288 }
 289
 290 static struct lfsck_component *
 291 lfsck_component_find(struct lfsck_instance *lfsck, __u16 type)
 292 {
 293         struct lfsck_component *com;
 294
 295         spin_lock(&lfsck->li_lock);
 296         com = __lfsck_component_find(lfsck, type, &lfsck->li_list_scan);
 297         if (com != NULL)
 298                 goto unlock;
 299
 300         com = __lfsck_component_find(lfsck, type,
 301                                      &lfsck->li_list_double_scan);
 302         if (com != NULL)
 303                 goto unlock;
 304
 305         com = __lfsck_component_find(lfsck, type, &lfsck->li_list_idle);
 306
 307 unlock:
 308         if (com != NULL)
 309                 lfsck_component_get(com);
 310         spin_unlock(&lfsck->li_lock);
 311         return com;
 312 }
 313
 314 void lfsck_component_cleanup(const struct lu_env *env,
 315                              struct lfsck_component *com)
 316 {
 317         if (!cfs_list_empty(&com->lc_link))
 318                 cfs_list_del_init(&com->lc_link);
 319         if (!cfs_list_empty(&com->lc_link_dir))
 320                 cfs_list_del_init(&com->lc_link_dir);
 321
 322         lfsck_component_put(env, com);
 323 }
 324
 325 void lfsck_instance_cleanup(const struct lu_env *env,
 326                             struct lfsck_instance *lfsck)
 327 {
 328         struct ptlrpc_thread    *thread = &lfsck->li_thread;
 329         struct lfsck_component  *com;
 330         ENTRY;
 331
 332         LASSERT(list_empty(&lfsck->li_link));
 333         LASSERT(thread_is_init(thread) || thread_is_stopped(thread));
 334
 335         if (lfsck->li_obj_oit != NULL) {
 336                 lu_object_put_nocache(env, &lfsck->li_obj_oit->do_lu);
 337                 lfsck->li_obj_oit = NULL;
 338         }
 339
 340         LASSERT(lfsck->li_obj_dir == NULL);
 341
 342         while (!cfs_list_empty(&lfsck->li_list_scan)) {
 343                 com = cfs_list_entry(lfsck->li_list_scan.next,
 344                                      struct lfsck_component,
 345                                      lc_link);
 346                 lfsck_component_cleanup(env, com);
 347         }
 348
 349         LASSERT(cfs_list_empty(&lfsck->li_list_dir));
 350
 351         while (!cfs_list_empty(&lfsck->li_list_double_scan)) {
 352                 com = cfs_list_entry(lfsck->li_list_double_scan.next,
 353                                      struct lfsck_component,
 354                                      lc_link);
 355                 lfsck_component_cleanup(env, com);
 356         }
 357
 358         while (!cfs_list_empty(&lfsck->li_list_idle)) {
 359                 com = cfs_list_entry(lfsck->li_list_idle.next,
 360                                      struct lfsck_component,
 361                                      lc_link);
 362                 lfsck_component_cleanup(env, com);
 363         }
 364
 365         lfsck_tgt_descs_fini(&lfsck->li_ost_descs);
 366         lfsck_tgt_descs_fini(&lfsck->li_mdt_descs);
 367
 368         if (lfsck->li_bookmark_obj != NULL) {
 369                 lu_object_put_nocache(env, &lfsck->li_bookmark_obj->do_lu);
 370                 lfsck->li_bookmark_obj = NULL;
 371         }
 372
 373         if (lfsck->li_los != NULL) {
 374                 local_oid_storage_fini(env, lfsck->li_los);
 375                 lfsck->li_los = NULL;
 376         }
 377
 378         OBD_FREE_PTR(lfsck);
 379 }
 380
 381 static inline struct lfsck_instance *
 382 __lfsck_instance_find(struct dt_device *key, bool ref, bool unlink)
 383 {
 384         struct lfsck_instance *lfsck;
 385
 386         cfs_list_for_each_entry(lfsck, &lfsck_instance_list, li_link) {
 387                 if (lfsck->li_bottom == key) {
 388                         if (ref)
 389                                 lfsck_instance_get(lfsck);
 390                         if (unlink)
 391                                 list_del_init(&lfsck->li_link);
 392
 393                         return lfsck;
 394                 }
 395         }
 396
 397         return NULL;
 398 }
 399
 400 static inline struct lfsck_instance *lfsck_instance_find(struct dt_device *key,
 401                                                          bool ref, bool unlink)
 402 {
 403         struct lfsck_instance *lfsck;
 404
 405         spin_lock(&lfsck_instance_lock);
 406         lfsck = __lfsck_instance_find(key, ref, unlink);
 407         spin_unlock(&lfsck_instance_lock);
 408
 409         return lfsck;
 410 }
 411
 412 static inline int lfsck_instance_add(struct lfsck_instance *lfsck)
 413 {
 414         struct lfsck_instance *tmp;
 415
 416         spin_lock(&lfsck_instance_lock);
 417         cfs_list_for_each_entry(tmp, &lfsck_instance_list, li_link) {
 418                 if (lfsck->li_bottom == tmp->li_bottom) {
 419                         spin_unlock(&lfsck_instance_lock);
 420                         return -EEXIST;
 421                 }
 422         }
 423
 424         cfs_list_add_tail(&lfsck->li_link, &lfsck_instance_list);
 425         spin_unlock(&lfsck_instance_lock);
 426         return 0;
 427 }
 428
 429 int lfsck_bits_dump(char **buf, int *len, int bits, const char *names[],
 430                     const char *prefix)
 431 {
 432         int save = *len;
 433         int flag;
 434         int rc;
 435         int i;
 436
 437         rc = snprintf(*buf, *len, "%s:%c", prefix, bits != 0 ? ' ' : '\n');
 438         if (rc <= 0)
 439                 return -ENOSPC;
 440
 441         *buf += rc;
 442         *len -= rc;
 443         for (i = 0, flag = 1; bits != 0; i++, flag = 1 << i) {
 444                 if (flag & bits) {
 445                         bits &= ~flag;
 446                         if (names[i] != NULL) {
 447                                 rc = snprintf(*buf, *len, "%s%c", names[i],
 448                                               bits != 0 ? ',' : '\n');
 449                                 if (rc <= 0)
 450                                         return -ENOSPC;
 451
 452                                 *buf += rc;
 453                                 *len -= rc;
 454                         }
 455                 }
 456         }
 457         return save - *len;
 458 }
 459
 460 int lfsck_time_dump(char **buf, int *len, __u64 time, const char *prefix)
 461 {
 462         int rc;
 463
 464         if (time != 0)
 465                 rc = snprintf(*buf, *len, "%s: "LPU64" seconds\n", prefix,
 466                               cfs_time_current_sec() - time);
 467         else
 468                 rc = snprintf(*buf, *len, "%s: N/A\n", prefix);
 469         if (rc <= 0)
 470                 return -ENOSPC;
 471
 472         *buf += rc;
 473         *len -= rc;
 474         return rc;
 475 }
 476
 477 int lfsck_pos_dump(char **buf, int *len, struct lfsck_position *pos,
 478                    const char *prefix)
 479 {
 480         int rc;
 481
 482         if (fid_is_zero(&pos->lp_dir_parent)) {
 483                 if (pos->lp_oit_cookie == 0)
 484                         rc = snprintf(*buf, *len, "%s: N/A, N/A, N/A\n",
 485                                       prefix);
 486                 else
 487                         rc = snprintf(*buf, *len, "%s: "LPU64", N/A, N/A\n",
 488                                       prefix, pos->lp_oit_cookie);
 489         } else {
 490                 rc = snprintf(*buf, *len, "%s: "LPU64", "DFID", "LPU64"\n",
 491                               prefix, pos->lp_oit_cookie,
 492                               PFID(&pos->lp_dir_parent), pos->lp_dir_cookie);
 493         }
 494         if (rc <= 0)
 495                 return -ENOSPC;
 496
 497         *buf += rc;
 498         *len -= rc;
 499         return rc;
 500 }
 501
 502 void lfsck_pos_fill(const struct lu_env *env, struct lfsck_instance *lfsck,
 503                     struct lfsck_position *pos, bool init)
 504 {
 505         const struct dt_it_ops *iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
 506
 507         if (unlikely(lfsck->li_di_oit == NULL)) {
 508                 memset(pos, 0, sizeof(*pos));
 509                 return;
 510         }
 511
 512         pos->lp_oit_cookie = iops->store(env, lfsck->li_di_oit);
 513         if (!lfsck->li_current_oit_processed && !init)
 514                 pos->lp_oit_cookie--;
 515
 516         LASSERT(pos->lp_oit_cookie > 0);
 517
 518         if (lfsck->li_di_dir != NULL) {
 519                 struct dt_object *dto = lfsck->li_obj_dir;
 520
 521                 pos->lp_dir_cookie = dto->do_index_ops->dio_it.store(env,
 522                                                         lfsck->li_di_dir);
 523
 524                 if (pos->lp_dir_cookie >= MDS_DIR_END_OFF) {
 525                         fid_zero(&pos->lp_dir_parent);
 526                         pos->lp_dir_cookie = 0;
 527                 } else {
 528                         pos->lp_dir_parent = *lfsck_dto2fid(dto);
 529                 }
 530         } else {
 531                 fid_zero(&pos->lp_dir_parent);
 532                 pos->lp_dir_cookie = 0;
 533         }
 534 }
 535
 536 static void __lfsck_set_speed(struct lfsck_instance *lfsck, __u32 limit)
 537 {
 538         lfsck->li_bookmark_ram.lb_speed_limit = limit;
 539         if (limit != LFSCK_SPEED_NO_LIMIT) {
 540                 if (limit > HZ) {
 541                         lfsck->li_sleep_rate = limit / HZ;
 542                         lfsck->li_sleep_jif = 1;
 543                 } else {
 544                         lfsck->li_sleep_rate = 1;
 545                         lfsck->li_sleep_jif = HZ / limit;
 546                 }
 547         } else {
 548                 lfsck->li_sleep_jif = 0;
 549                 lfsck->li_sleep_rate = 0;
 550         }
 551 }
 552
 553 void lfsck_control_speed(struct lfsck_instance *lfsck)
 554 {
 555         struct ptlrpc_thread *thread = &lfsck->li_thread;
 556         struct l_wait_info    lwi;
 557
 558         if (lfsck->li_sleep_jif > 0 &&
 559             lfsck->li_new_scanned >= lfsck->li_sleep_rate) {
 560                 lwi = LWI_TIMEOUT_INTR(lfsck->li_sleep_jif, NULL,
 561                                        LWI_ON_SIGNAL_NOOP, NULL);
 562
 563                 l_wait_event(thread->t_ctl_waitq,
 564                              !thread_is_running(thread),
 565                              &lwi);
 566                 lfsck->li_new_scanned = 0;
 567         }
 568 }
 569
 570 void lfsck_control_speed_by_self(struct lfsck_component *com)
 571 {
 572         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 573         struct ptlrpc_thread    *thread = &lfsck->li_thread;
 574         struct l_wait_info       lwi;
 575
 576         if (lfsck->li_sleep_jif > 0 &&
 577             com->lc_new_scanned >= lfsck->li_sleep_rate) {
 578                 lwi = LWI_TIMEOUT_INTR(lfsck->li_sleep_jif, NULL,
 579                                        LWI_ON_SIGNAL_NOOP, NULL);
 580
 581                 l_wait_event(thread->t_ctl_waitq,
 582                              !thread_is_running(thread),
 583                              &lwi);
 584                 com->lc_new_scanned = 0;
 585         }
 586 }
 587
 588 static int lfsck_parent_fid(const struct lu_env *env, struct dt_object *obj,
 589                             struct lu_fid *fid)
 590 {
 591         if (unlikely(!S_ISDIR(lfsck_object_type(obj)) ||
 592                      !dt_try_as_dir(env, obj)))
 593                 return -ENOTDIR;
 594
 595         return dt_lookup(env, obj, (struct dt_rec *)fid,
 596                          (const struct dt_key *)"..", BYPASS_CAPA);
 597 }
 598
 599 static int lfsck_needs_scan_dir(const struct lu_env *env,
 600                                 struct lfsck_instance *lfsck,
 601                                 struct dt_object *obj)
 602 {
 603         struct lu_fid *fid   = &lfsck_env_info(env)->lti_fid;
 604         int            depth = 0;
 605         int            rc;
 606
 607         if (!lfsck->li_master || !S_ISDIR(lfsck_object_type(obj)) ||
 608             cfs_list_empty(&lfsck->li_list_dir))
 609                RETURN(0);
 610
 611         while (1) {
 612                 /* XXX: Currently, we do not scan the "/REMOTE_PARENT_DIR",
 613                  *      which is the agent directory to manage the objects
 614                  *      which name entries reside on remote MDTs. Related
 615                  *      consistency verification will be processed in LFSCK
 616                  *      phase III. */
 617                 if (lu_fid_eq(lfsck_dto2fid(obj), &lfsck->li_global_root_fid)) {
 618                         if (depth > 0)
 619                                 lfsck_object_put(env, obj);
 620                         return 1;
 621                 }
 622
 623                 /* .lustre doesn't contain "real" user objects, no need lfsck */
 624                 if (fid_is_dot_lustre(lfsck_dto2fid(obj))) {
 625                         if (depth > 0)
 626                                 lfsck_object_put(env, obj);
 627                         return 0;
 628                 }
 629
 630                 dt_read_lock(env, obj, MOR_TGT_CHILD);
 631                 if (unlikely(lfsck_is_dead_obj(obj))) {
 632                         dt_read_unlock(env, obj);
 633                         if (depth > 0)
 634                                 lfsck_object_put(env, obj);
 635                         return 0;
 636                 }
 637
 638                 rc = dt_xattr_get(env, obj,
 639                                   lfsck_buf_get(env, NULL, 0), XATTR_NAME_LINK,
 640                                   BYPASS_CAPA);
 641                 dt_read_unlock(env, obj);
 642                 if (rc >= 0) {
 643                         if (depth > 0)
 644                                 lfsck_object_put(env, obj);
 645                         return 1;
 646                 }
 647
 648                 if (rc < 0 && rc != -ENODATA) {
 649                         if (depth > 0)
 650                                 lfsck_object_put(env, obj);
 651                         return rc;
 652                 }
 653
 654                 rc = lfsck_parent_fid(env, obj, fid);
 655                 if (depth > 0)
 656                         lfsck_object_put(env, obj);
 657                 if (rc != 0)
 658                         return rc;
 659
 660                 if (unlikely(lu_fid_eq(fid, &lfsck->li_local_root_fid)))
 661                         return 0;
 662
 663                 obj = lfsck_object_find(env, lfsck, fid);
 664                 if (obj == NULL)
 665                         return 0;
 666                 else if (IS_ERR(obj))
 667                         return PTR_ERR(obj);
 668
 669                 if (!dt_object_exists(obj)) {
 670                         lfsck_object_put(env, obj);
 671                         return 0;
 672                 }
 673
 674                 /* Currently, only client visible directory can be remote. */
 675                 if (dt_object_remote(obj)) {
 676                         lfsck_object_put(env, obj);
 677                         return 1;
 678                 }
 679
 680                 depth++;
 681         }
 682         return 0;
 683 }
 684
 685 struct lfsck_thread_args *lfsck_thread_args_init(struct lfsck_instance *lfsck,
 686                                                  struct lfsck_component *com,
 687                                                  struct lfsck_start_param *lsp)
 688 {
 689         struct lfsck_thread_args *lta;
 690         int                       rc;
 691
 692         OBD_ALLOC_PTR(lta);
 693         if (lta == NULL)
 694                 return ERR_PTR(-ENOMEM);
 695
 696         rc = lu_env_init(&lta->lta_env, LCT_MD_THREAD | LCT_DT_THREAD);
 697         if (rc != 0) {
 698                 OBD_FREE_PTR(lta);
 699                 return ERR_PTR(rc);
 700         }
 701
 702         lta->lta_lfsck = lfsck_instance_get(lfsck);
 703         if (com != NULL)
 704                 lta->lta_com = lfsck_component_get(com);
 705
 706         lta->lta_lsp = lsp;
 707
 708         return lta;
 709 }
 710
 711 void lfsck_thread_args_fini(struct lfsck_thread_args *lta)
 712 {
 713         if (lta->lta_com != NULL)
 714                 lfsck_component_put(&lta->lta_env, lta->lta_com);
 715         lfsck_instance_put(&lta->lta_env, lta->lta_lfsck);
 716         lu_env_fini(&lta->lta_env);
 717         OBD_FREE_PTR(lta);
 718 }
 719
 720 /* LFSCK wrap functions */
 721
 722 void lfsck_fail(const struct lu_env *env, struct lfsck_instance *lfsck,
 723                 bool new_checked)
 724 {
 725         struct lfsck_component *com;
 726
 727         cfs_list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 728                 com->lc_ops->lfsck_fail(env, com, new_checked);
 729         }
 730 }
 731
 732 int lfsck_checkpoint(const struct lu_env *env, struct lfsck_instance *lfsck)
 733 {
 734         struct lfsck_component *com;
 735         int                     rc  = 0;
 736         int                     rc1 = 0;
 737
 738         if (likely(cfs_time_beforeq(cfs_time_current(),
 739                                     lfsck->li_time_next_checkpoint)))
 740                 return 0;
 741
 742         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_current, false);
 743         cfs_list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 744                 rc = com->lc_ops->lfsck_checkpoint(env, com, false);
 745                 if (rc != 0)
 746                         rc1 = rc;
 747         }
 748
 749         lfsck->li_time_last_checkpoint = cfs_time_current();
 750         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 751                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
 752         return rc1 != 0 ? rc1 : rc;
 753 }
 754
 755 int lfsck_prep(const struct lu_env *env, struct lfsck_instance *lfsck,
 756                struct lfsck_start_param *lsp)
 757 {
 758         struct dt_object       *obj     = NULL;
 759         struct lfsck_component *com;
 760         struct lfsck_component *next;
 761         struct lfsck_position  *pos     = NULL;
 762         const struct dt_it_ops *iops    =
 763                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
 764         struct dt_it           *di;
 765         int                     rc;
 766         ENTRY;
 767
 768         LASSERT(lfsck->li_obj_dir == NULL);
 769         LASSERT(lfsck->li_di_dir == NULL);
 770
 771         lfsck->li_current_oit_processed = 0;
 772         cfs_list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
 773                 com->lc_new_checked = 0;
 774                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
 775                         com->lc_journal = 0;
 776
 777                 rc = com->lc_ops->lfsck_prep(env, com, lsp);
 778                 if (rc != 0)
 779                         GOTO(out, rc);
 780
 781                 if ((pos == NULL) ||
 782                     (!lfsck_pos_is_zero(&com->lc_pos_start) &&
 783                      lfsck_pos_is_eq(pos, &com->lc_pos_start) > 0))
 784                         pos = &com->lc_pos_start;
 785         }
 786
 787         /* Init otable-based iterator. */
 788         if (pos == NULL) {
 789                 rc = iops->load(env, lfsck->li_di_oit, 0);
 790                 if (rc > 0) {
 791                         lfsck->li_oit_over = 1;
 792                         rc = 0;
 793                 }
 794
 795                 GOTO(out, rc);
 796         }
 797
 798         rc = iops->load(env, lfsck->li_di_oit, pos->lp_oit_cookie);
 799         if (rc < 0)
 800                 GOTO(out, rc);
 801         else if (rc > 0)
 802                 lfsck->li_oit_over = 1;
 803
 804         if (!lfsck->li_master || fid_is_zero(&pos->lp_dir_parent))
 805                 GOTO(out, rc = 0);
 806
 807         /* Find the directory for namespace-based traverse. */
 808         obj = lfsck_object_find(env, lfsck, &pos->lp_dir_parent);
 809         if (obj == NULL)
 810                 GOTO(out, rc = 0);
 811         else if (IS_ERR(obj))
 812                 RETURN(PTR_ERR(obj));
 813
 814         /* XXX: Currently, skip remote object, the consistency for
 815          *      remote object will be processed in LFSCK phase III. */
 816         if (!dt_object_exists(obj) || dt_object_remote(obj) ||
 817             unlikely(!S_ISDIR(lfsck_object_type(obj))))
 818                 GOTO(out, rc = 0);
 819
 820         if (unlikely(!dt_try_as_dir(env, obj)))
 821                 GOTO(out, rc = -ENOTDIR);
 822
 823         /* Init the namespace-based directory traverse. */
 824         iops = &obj->do_index_ops->dio_it;
 825         di = iops->init(env, obj, lfsck->li_args_dir, BYPASS_CAPA);
 826         if (IS_ERR(di))
 827                 GOTO(out, rc = PTR_ERR(di));
 828
 829         LASSERT(pos->lp_dir_cookie < MDS_DIR_END_OFF);
 830
 831         rc = iops->load(env, di, pos->lp_dir_cookie);
 832         if ((rc == 0) || (rc > 0 && pos->lp_dir_cookie > 0))
 833                 rc = iops->next(env, di);
 834         else if (rc > 0)
 835                 rc = 0;
 836
 837         if (rc != 0) {
 838                 iops->put(env, di);
 839                 iops->fini(env, di);
 840                 GOTO(out, rc);
 841         }
 842
 843         lfsck->li_obj_dir = lfsck_object_get(obj);
 844         lfsck->li_cookie_dir = iops->store(env, di);
 845         spin_lock(&lfsck->li_lock);
 846         lfsck->li_di_dir = di;
 847         spin_unlock(&lfsck->li_lock);
 848
 849         GOTO(out, rc = 0);
 850
 851 out:
 852         if (obj != NULL)
 853                 lfsck_object_put(env, obj);
 854
 855         if (rc < 0) {
 856                 cfs_list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
 857                                              lc_link)
 858                         com->lc_ops->lfsck_post(env, com, rc, true);
 859
 860                 return rc;
 861         }
 862
 863         rc = 0;
 864         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_current, true);
 865         cfs_list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 866                 rc = com->lc_ops->lfsck_checkpoint(env, com, true);
 867                 if (rc != 0)
 868                         break;
 869         }
 870
 871         lfsck->li_time_last_checkpoint = cfs_time_current();
 872         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 873                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
 874         return rc;
 875 }
 876
 877 int lfsck_exec_oit(const struct lu_env *env, struct lfsck_instance *lfsck,
 878                    struct dt_object *obj)
 879 {
 880         struct lfsck_component *com;
 881         const struct dt_it_ops *iops;
 882         struct dt_it           *di;
 883         int                     rc;
 884         ENTRY;
 885
 886         LASSERT(lfsck->li_obj_dir == NULL);
 887
 888         cfs_list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 889                 rc = com->lc_ops->lfsck_exec_oit(env, com, obj);
 890                 if (rc != 0)
 891                         RETURN(rc);
 892         }
 893
 894         rc = lfsck_needs_scan_dir(env, lfsck, obj);
 895         if (rc <= 0)
 896                 GOTO(out, rc);
 897
 898         if (unlikely(!dt_try_as_dir(env, obj)))
 899                 GOTO(out, rc = -ENOTDIR);
 900
 901         iops = &obj->do_index_ops->dio_it;
 902         di = iops->init(env, obj, lfsck->li_args_dir, BYPASS_CAPA);
 903         if (IS_ERR(di))
 904                 GOTO(out, rc = PTR_ERR(di));
 905
 906         rc = iops->load(env, di, 0);
 907         if (rc == 0)
 908                 rc = iops->next(env, di);
 909         else if (rc > 0)
 910                 rc = 0;
 911
 912         if (rc != 0) {
 913                 iops->put(env, di);
 914                 iops->fini(env, di);
 915                 GOTO(out, rc);
 916         }
 917
 918         lfsck->li_obj_dir = lfsck_object_get(obj);
 919         lfsck->li_cookie_dir = iops->store(env, di);
 920         spin_lock(&lfsck->li_lock);
 921         lfsck->li_di_dir = di;
 922         spin_unlock(&lfsck->li_lock);
 923
 924         GOTO(out, rc = 0);
 925
 926 out:
 927         if (rc < 0)
 928                 lfsck_fail(env, lfsck, false);
 929         return (rc > 0 ? 0 : rc);
 930 }
 931
 932 int lfsck_exec_dir(const struct lu_env *env, struct lfsck_instance *lfsck,
 933                    struct dt_object *obj, struct lu_dirent *ent)
 934 {
 935         struct lfsck_component *com;
 936         int                     rc;
 937
 938         cfs_list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 939                 rc = com->lc_ops->lfsck_exec_dir(env, com, obj, ent);
 940                 if (rc != 0)
 941                         return rc;
 942         }
 943         return 0;
 944 }
 945
 946 int lfsck_post(const struct lu_env *env, struct lfsck_instance *lfsck,
 947                int result)
 948 {
 949         struct lfsck_component *com;
 950         struct lfsck_component *next;
 951         int                     rc  = 0;
 952         int                     rc1 = 0;
 953
 954         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_current, false);
 955         cfs_list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
 956                 rc = com->lc_ops->lfsck_post(env, com, result, false);
 957                 if (rc != 0)
 958                         rc1 = rc;
 959         }
 960
 961         lfsck->li_time_last_checkpoint = cfs_time_current();
 962         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 963                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
 964
 965         /* Ignore some component post failure to make other can go ahead. */
 966         return result;
 967 }
 968
 969 int lfsck_double_scan(const struct lu_env *env, struct lfsck_instance *lfsck)
 970 {
 971         struct lfsck_component *com;
 972         struct lfsck_component *next;
 973         struct l_wait_info      lwi = { 0 };
 974         int                     rc  = 0;
 975         int                     rc1 = 0;
 976
 977         cfs_list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
 978                                      lc_link) {
 979                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
 980                         com->lc_journal = 0;
 981
 982                 rc = com->lc_ops->lfsck_double_scan(env, com);
 983                 if (rc != 0)
 984                         rc1 = rc;
 985         }
 986
 987         l_wait_event(lfsck->li_thread.t_ctl_waitq,
 988                      atomic_read(&lfsck->li_double_scan_count) == 0,
 989                      &lwi);
 990
 991         return rc1 != 0 ? rc1 : rc;
 992 }
 993
 994 int lfsck_stop_notify(const struct lu_env *env, struct lfsck_instance *lfsck,
 995                       struct lfsck_tgt_descs *ltds, struct lfsck_tgt_desc *ltd)
 996 {
 997         struct ptlrpc_request_set *set;
 998         struct lfsck_component    *com;
 999         int                        cnt = 0;
1000         int                        rc  = 0;
1001         int                        rc1 = 0;
1002
1003         set = ptlrpc_prep_set();
1004         if (set == NULL)
1005                 return -ENOMEM;
1006
1007         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
1008                 if (com->lc_ops->lfsck_stop_notify != NULL) {
1009                         rc = com->lc_ops->lfsck_stop_notify(env, com, ltds,
1010                                                             ltd, set);
1011                         if (rc != 0)
1012                                 rc1 = rc;
1013                         else
1014                                 cnt++;
1015                 }
1016         }
1017
1018         list_for_each_entry(com, &lfsck->li_list_double_scan, lc_link) {
1019                 if (com->lc_ops->lfsck_stop_notify != NULL) {
1020                         rc = com->lc_ops->lfsck_stop_notify(env, com, ltds,
1021                                                             ltd, set);
1022                         if (rc != 0)
1023                                 rc1 = rc;
1024                         else
1025                                 cnt++;
1026                 }
1027         }
1028
1029         if (cnt > 0)
1030                 rc = ptlrpc_set_wait(set);
1031         ptlrpc_set_destroy(set);
1032
1033         return rc1 != 0 ? rc1 : rc;
1034 }
1035
1036 void lfsck_quit(const struct lu_env *env, struct lfsck_instance *lfsck)
1037 {
1038         struct lfsck_component *com;
1039         struct lfsck_component *next;
1040
1041         list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
1042                                  lc_link) {
1043                 if (com->lc_ops->lfsck_quit != NULL)
1044                         com->lc_ops->lfsck_quit(env, com);
1045         }
1046
1047         list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
1048                                  lc_link) {
1049                 if (com->lc_ops->lfsck_quit != NULL)
1050                         com->lc_ops->lfsck_quit(env, com);
1051         }
1052 }
1053
1054 int lfsck_async_request(const struct lu_env *env, struct obd_export *exp,
1055                         struct lfsck_request *lr,
1056                         struct ptlrpc_request_set *set,
1057                         ptlrpc_interpterer_t interpreter,
1058                         void *args, int request)
1059 {
1060         struct lfsck_async_interpret_args *laia;
1061         struct ptlrpc_request             *req;
1062         struct lfsck_request              *tmp;
1063         struct req_format                 *format;
1064         int                                rc;
1065
1066         if (!(exp_connect_flags(exp) & OBD_CONNECT_LFSCK))
1067                 return -EOPNOTSUPP;
1068
1069         switch (request) {
1070         case LFSCK_NOTIFY:
1071                 format = &RQF_LFSCK_NOTIFY;
1072                 break;
1073         case LFSCK_QUERY:
1074                 format = &RQF_LFSCK_QUERY;
1075                 break;
1076         default:
1077                 CERROR("%s: unknown async request: opc = %d\n",
1078                        exp->exp_obd->obd_name, request);
1079                 return -EINVAL;
1080         }
1081
1082         req = ptlrpc_request_alloc(class_exp2cliimp(exp), format);
1083         if (req == NULL)
1084                 return -ENOMEM;
1085
1086         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, request);
1087         if (rc != 0) {
1088                 ptlrpc_request_free(req);
1089
1090                 return rc;
1091         }
1092
1093         tmp = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
1094         *tmp = *lr;
1095         ptlrpc_request_set_replen(req);
1096
1097         laia = ptlrpc_req_async_args(req);
1098         *laia = *(struct lfsck_async_interpret_args *)args;
1099         lfsck_component_get(laia->laia_com);
1100         req->rq_interpret_reply = interpreter;
1101         ptlrpc_set_add_req(set, req);
1102
1103         return 0;
1104 }
1105
1106 /* external interfaces */
1107
1108 int lfsck_get_speed(struct dt_device *key, void *buf, int len)
1109 {
1110         struct lu_env           env;
1111         struct lfsck_instance  *lfsck;
1112         int                     rc;
1113         ENTRY;
1114
1115         rc = lu_env_init(&env, LCT_MD_THREAD | LCT_DT_THREAD);
1116         if (rc != 0)
1117                 RETURN(rc);
1118
1119         lfsck = lfsck_instance_find(key, true, false);
1120         if (likely(lfsck != NULL)) {
1121                 rc = snprintf(buf, len, "%u\n",
1122                               lfsck->li_bookmark_ram.lb_speed_limit);
1123                 lfsck_instance_put(&env, lfsck);
1124         } else {
1125                 rc = -ENODEV;
1126         }
1127
1128         lu_env_fini(&env);
1129
1130         RETURN(rc);
1131 }
1132 EXPORT_SYMBOL(lfsck_get_speed);
1133
1134 int lfsck_set_speed(struct dt_device *key, int val)
1135 {
1136         struct lu_env           env;
1137         struct lfsck_instance  *lfsck;
1138         int                     rc;
1139         ENTRY;
1140
1141         rc = lu_env_init(&env, LCT_MD_THREAD | LCT_DT_THREAD);
1142         if (rc != 0)
1143                 RETURN(rc);
1144
1145         lfsck = lfsck_instance_find(key, true, false);
1146         if (likely(lfsck != NULL)) {
1147                 mutex_lock(&lfsck->li_mutex);
1148                 __lfsck_set_speed(lfsck, val);
1149                 rc = lfsck_bookmark_store(&env, lfsck);
1150                 mutex_unlock(&lfsck->li_mutex);
1151                 lfsck_instance_put(&env, lfsck);
1152         } else {
1153                 rc = -ENODEV;
1154         }
1155
1156         lu_env_fini(&env);
1157
1158         RETURN(rc);
1159 }
1160 EXPORT_SYMBOL(lfsck_set_speed);
1161
1162 int lfsck_get_windows(struct dt_device *key, void *buf, int len)
1163 {
1164         struct lu_env           env;
1165         struct lfsck_instance  *lfsck;
1166         int                     rc;
1167         ENTRY;
1168
1169         rc = lu_env_init(&env, LCT_MD_THREAD | LCT_DT_THREAD);
1170         if (rc != 0)
1171                 RETURN(rc);
1172
1173         lfsck = lfsck_instance_find(key, true, false);
1174         if (likely(lfsck != NULL)) {
1175                 rc = snprintf(buf, len, "%u\n",
1176                               lfsck->li_bookmark_ram.lb_async_windows);
1177                 lfsck_instance_put(&env, lfsck);
1178         } else {
1179                 rc = -ENODEV;
1180         }
1181
1182         lu_env_fini(&env);
1183
1184         RETURN(rc);
1185 }
1186 EXPORT_SYMBOL(lfsck_get_windows);
1187
1188 int lfsck_set_windows(struct dt_device *key, int val)
1189 {
1190         struct lu_env           env;
1191         struct lfsck_instance  *lfsck;
1192         int                     rc;
1193         ENTRY;
1194
1195         rc = lu_env_init(&env, LCT_MD_THREAD | LCT_DT_THREAD);
1196         if (rc != 0)
1197                 RETURN(rc);
1198
1199         lfsck = lfsck_instance_find(key, true, false);
1200         if (likely(lfsck != NULL)) {
1201                 if (val > LFSCK_ASYNC_WIN_MAX) {
1202                         CERROR("%s: Too large async windows size, which "
1203                                "may cause memory issues. The valid range "
1204                                "is [0 - %u]. If you do not want to restrict "
1205                                "the windows size for async requests pipeline, "
1206                                "just set it as 0.\n",
1207                                lfsck_lfsck2name(lfsck), LFSCK_ASYNC_WIN_MAX);
1208                         rc = -EINVAL;
1209                 } else if (lfsck->li_bookmark_ram.lb_async_windows != val) {
1210                         mutex_lock(&lfsck->li_mutex);
1211                         lfsck->li_bookmark_ram.lb_async_windows = val;
1212                         rc = lfsck_bookmark_store(&env, lfsck);
1213                         mutex_unlock(&lfsck->li_mutex);
1214                 }
1215                 lfsck_instance_put(&env, lfsck);
1216         } else {
1217                 rc = -ENODEV;
1218         }
1219
1220         lu_env_fini(&env);
1221
1222         RETURN(rc);
1223 }
1224 EXPORT_SYMBOL(lfsck_set_windows);
1225
1226 int lfsck_dump(struct dt_device *key, void *buf, int len, enum lfsck_type type)
1227 {
1228         struct lu_env           env;
1229         struct lfsck_instance  *lfsck;
1230         struct lfsck_component *com;
1231         int                     rc;
1232         ENTRY;
1233
1234         rc = lu_env_init(&env, LCT_MD_THREAD | LCT_DT_THREAD);
1235         if (rc != 0)
1236                 RETURN(rc);
1237
1238         lfsck = lfsck_instance_find(key, true, false);
1239         if (likely(lfsck != NULL)) {
1240                 com = lfsck_component_find(lfsck, type);
1241                 if (likely(com != NULL)) {
1242                         rc = com->lc_ops->lfsck_dump(&env, com, buf, len);
1243                         lfsck_component_put(&env, com);
1244                 } else {
1245                         rc = -ENOTSUPP;
1246                 }
1247
1248                 lfsck_instance_put(&env, lfsck);
1249         } else {
1250                 rc = -ENODEV;
1251         }
1252
1253         lu_env_fini(&env);
1254
1255         RETURN(rc);
1256 }
1257 EXPORT_SYMBOL(lfsck_dump);
1258
1259 int lfsck_start(const struct lu_env *env, struct dt_device *key,
1260                 struct lfsck_start_param *lsp)
1261 {
1262         struct lfsck_start              *start  = lsp->lsp_start;
1263         struct lfsck_instance           *lfsck;
1264         struct lfsck_bookmark           *bk;
1265         struct ptlrpc_thread            *thread;
1266         struct lfsck_component          *com;
1267         struct l_wait_info               lwi    = { 0 };
1268         struct lfsck_thread_args        *lta;
1269         bool                             dirty  = false;
1270         long                             rc     = 0;
1271         __u16                            valid  = 0;
1272         __u16                            flags  = 0;
1273         __u16                            type   = 1;
1274         ENTRY;
1275
1276         lfsck = lfsck_instance_find(key, true, false);
1277         if (unlikely(lfsck == NULL))
1278                 RETURN(-ENODEV);
1279
1280         /* start == NULL means auto trigger paused LFSCK. */
1281         if ((start == NULL) &&
1282             (cfs_list_empty(&lfsck->li_list_scan) ||
1283              OBD_FAIL_CHECK(OBD_FAIL_LFSCK_NO_AUTO)))
1284                 GOTO(put, rc = 0);
1285
1286         bk = &lfsck->li_bookmark_ram;
1287         thread = &lfsck->li_thread;
1288         mutex_lock(&lfsck->li_mutex);
1289         spin_lock(&lfsck->li_lock);
1290         if (!thread_is_init(thread) && !thread_is_stopped(thread)) {
1291                 rc = -EALREADY;
1292                 while (start->ls_active != 0) {
1293                         if (!(type & start->ls_active)) {
1294                                 type <<= 1;
1295                                 continue;
1296                         }
1297
1298                         com = __lfsck_component_find(lfsck, type,
1299                                                      &lfsck->li_list_scan);
1300                         if (com == NULL)
1301                                 com = __lfsck_component_find(lfsck, type,
1302                                                 &lfsck->li_list_double_scan);
1303                         if (com == NULL) {
1304                                 rc = -EOPNOTSUPP;
1305                                 break;
1306                         }
1307
1308                         if (com->lc_ops->lfsck_join != NULL) {
1309                                 rc = com->lc_ops->lfsck_join( env, com, lsp);
1310                                 if (rc != 0 && rc != -EALREADY)
1311                                         break;
1312                         }
1313                         start->ls_active &= ~type;
1314                         type <<= 1;
1315                 }
1316                 spin_unlock(&lfsck->li_lock);
1317                 GOTO(out, rc);
1318         }
1319         spin_unlock(&lfsck->li_lock);
1320
1321         lfsck->li_namespace = lsp->lsp_namespace;
1322         lfsck->li_status = 0;
1323         lfsck->li_oit_over = 0;
1324         lfsck->li_drop_dryrun = 0;
1325         lfsck->li_new_scanned = 0;
1326
1327         /* For auto trigger. */
1328         if (start == NULL)
1329                 goto trigger;
1330
1331         start->ls_version = bk->lb_version;
1332         if (start->ls_valid & LSV_SPEED_LIMIT) {
1333                 __lfsck_set_speed(lfsck, start->ls_speed_limit);
1334                 dirty = true;
1335         }
1336
1337         if (start->ls_valid & LSV_ASYNC_WINDOWS &&
1338             bk->lb_async_windows != start->ls_async_windows) {
1339                 bk->lb_async_windows = start->ls_async_windows;
1340                 dirty = true;
1341         }
1342
1343         if (start->ls_valid & LSV_ERROR_HANDLE) {
1344                 valid |= DOIV_ERROR_HANDLE;
1345                 if (start->ls_flags & LPF_FAILOUT)
1346                         flags |= DOIF_FAILOUT;
1347
1348                 if ((start->ls_flags & LPF_FAILOUT) &&
1349                     !(bk->lb_param & LPF_FAILOUT)) {
1350                         bk->lb_param |= LPF_FAILOUT;
1351                         dirty = true;
1352                 } else if (!(start->ls_flags & LPF_FAILOUT) &&
1353                            (bk->lb_param & LPF_FAILOUT)) {
1354                         bk->lb_param &= ~LPF_FAILOUT;
1355                         dirty = true;
1356                 }
1357         }
1358
1359         if (start->ls_valid & LSV_DRYRUN) {
1360                 valid |= DOIV_DRYRUN;
1361                 if (start->ls_flags & LPF_DRYRUN)
1362                         flags |= DOIF_DRYRUN;
1363
1364                 if ((start->ls_flags & LPF_DRYRUN) &&
1365                     !(bk->lb_param & LPF_DRYRUN)) {
1366                         bk->lb_param |= LPF_DRYRUN;
1367                         dirty = true;
1368                 } else if (!(start->ls_flags & LPF_DRYRUN) &&
1369                            (bk->lb_param & LPF_DRYRUN)) {
1370                         bk->lb_param &= ~LPF_DRYRUN;
1371                         lfsck->li_drop_dryrun = 1;
1372                         dirty = true;
1373                 }
1374         }
1375
1376         if (bk->lb_param & LPF_ALL_MDT &&
1377             !(start->ls_flags & LPF_ALL_MDT)) {
1378                 bk->lb_param &= ~LPF_ALL_MDT;
1379                 dirty = true;
1380         } else if (!(bk->lb_param & LPF_ALL_MDT) &&
1381                    start->ls_flags & LPF_ALL_MDT) {
1382                 bk->lb_param |= LPF_ALL_MDT;
1383                 dirty = true;
1384         }
1385
1386         if (dirty) {
1387                 rc = lfsck_bookmark_store(env, lfsck);
1388                 if (rc != 0)
1389                         GOTO(out, rc);
1390         }
1391
1392         if (start->ls_flags & LPF_RESET)
1393                 flags |= DOIF_RESET;
1394
1395         if (start->ls_active != 0) {
1396                 struct lfsck_component *next;
1397
1398                 if (start->ls_active == LFSCK_TYPES_ALL)
1399                         start->ls_active = LFSCK_TYPES_SUPPORTED;
1400
1401                 if (start->ls_active & ~LFSCK_TYPES_SUPPORTED) {
1402                         start->ls_active &= ~LFSCK_TYPES_SUPPORTED;
1403                         GOTO(out, rc = -ENOTSUPP);
1404                 }
1405
1406                 cfs_list_for_each_entry_safe(com, next,
1407                                              &lfsck->li_list_scan, lc_link) {
1408                         if (!(com->lc_type & start->ls_active)) {
1409                                 rc = com->lc_ops->lfsck_post(env, com, 0,
1410                                                              false);
1411                                 if (rc != 0)
1412                                         GOTO(out, rc);
1413                         }
1414                 }
1415
1416                 while (start->ls_active != 0) {
1417                         if (type & start->ls_active) {
1418                                 com = __lfsck_component_find(lfsck, type,
1419                                                         &lfsck->li_list_idle);
1420                                 if (com != NULL) {
1421                                         /* The component status will be updated
1422                                          * when its prep() is called later by
1423                                          * the LFSCK main engine. */
1424                                         cfs_list_del_init(&com->lc_link);
1425                                         cfs_list_add_tail(&com->lc_link,
1426                                                           &lfsck->li_list_scan);
1427                                 }
1428                                 start->ls_active &= ~type;
1429                         }
1430                         type <<= 1;
1431                 }
1432         }
1433
1434         cfs_list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
1435                 start->ls_active |= com->lc_type;
1436                 if (flags & DOIF_RESET) {
1437                         rc = com->lc_ops->lfsck_reset(env, com, false);
1438                         if (rc != 0)
1439                                 GOTO(out, rc);
1440                 }
1441         }
1442
1443 trigger:
1444         lfsck->li_args_dir = LUDA_64BITHASH | LUDA_VERIFY;
1445         if (bk->lb_param & LPF_DRYRUN) {
1446                 lfsck->li_args_dir |= LUDA_VERIFY_DRYRUN;
1447                 valid |= DOIV_DRYRUN;
1448                 flags |= DOIF_DRYRUN;
1449         }
1450
1451         if (bk->lb_param & LPF_FAILOUT) {
1452                 valid |= DOIV_ERROR_HANDLE;
1453                 flags |= DOIF_FAILOUT;
1454         }
1455
1456         if (!cfs_list_empty(&lfsck->li_list_scan))
1457                 flags |= DOIF_OUTUSED;
1458
1459         lfsck->li_args_oit = (flags << DT_OTABLE_IT_FLAGS_SHIFT) | valid;
1460         thread_set_flags(thread, 0);
1461         lta = lfsck_thread_args_init(lfsck, NULL, lsp);
1462         if (IS_ERR(lta))
1463                 GOTO(out, rc = PTR_ERR(lta));
1464
1465         rc = PTR_ERR(kthread_run(lfsck_master_engine, lta, "lfsck"));
1466         if (IS_ERR_VALUE(rc)) {
1467                 CERROR("%s: cannot start LFSCK thread: rc = %ld\n",
1468                        lfsck_lfsck2name(lfsck), rc);
1469                 lfsck_thread_args_fini(lta);
1470         } else {
1471                 rc = 0;
1472                 l_wait_event(thread->t_ctl_waitq,
1473                              thread_is_running(thread) ||
1474                              thread_is_stopped(thread),
1475                              &lwi);
1476         }
1477
1478         GOTO(out, rc);
1479
1480 out:
1481         mutex_unlock(&lfsck->li_mutex);
1482 put:
1483         lfsck_instance_put(env, lfsck);
1484         return (rc < 0 ? rc : 0);
1485 }
1486 EXPORT_SYMBOL(lfsck_start);
1487
1488 int lfsck_stop(const struct lu_env *env, struct dt_device *key,
1489                struct lfsck_stop *stop)
1490 {
1491         struct lfsck_instance   *lfsck;
1492         struct ptlrpc_thread    *thread;
1493         struct l_wait_info       lwi    = { 0 };
1494         int                      rc     = 0;
1495         ENTRY;
1496
1497         lfsck = lfsck_instance_find(key, true, false);
1498         if (unlikely(lfsck == NULL))
1499                 RETURN(-ENODEV);
1500
1501         thread = &lfsck->li_thread;
1502         mutex_lock(&lfsck->li_mutex);
1503         spin_lock(&lfsck->li_lock);
1504         if (thread_is_init(thread) || thread_is_stopped(thread)) {
1505                 spin_unlock(&lfsck->li_lock);
1506                 GOTO(out, rc = -EALREADY);
1507         }
1508
1509         if (stop != NULL) {
1510                 lfsck->li_status = stop->ls_status;
1511                 lfsck->li_flags = stop->ls_flags;
1512         } else {
1513                 lfsck->li_status = LS_STOPPED;
1514                 lfsck->li_flags = 0;
1515         }
1516
1517         thread_set_flags(thread, SVC_STOPPING);
1518         spin_unlock(&lfsck->li_lock);
1519
1520         wake_up_all(&thread->t_ctl_waitq);
1521         l_wait_event(thread->t_ctl_waitq,
1522                      thread_is_stopped(thread),
1523                      &lwi);
1524
1525         GOTO(out, rc = 0);
1526
1527 out:
1528         mutex_unlock(&lfsck->li_mutex);
1529         lfsck_instance_put(env, lfsck);
1530
1531         return rc;
1532 }
1533 EXPORT_SYMBOL(lfsck_stop);
1534
1535 int lfsck_in_notify(const struct lu_env *env, struct dt_device *key,
1536                     struct lfsck_request *lr)
1537 {
1538         struct lfsck_instance  *lfsck;
1539         struct lfsck_component *com;
1540         int                     rc;
1541         ENTRY;
1542
1543         switch (lr->lr_event) {
1544         case LE_STOP:
1545         case LE_PHASE1_DONE:
1546         case LE_PHASE2_DONE:
1547                 break;
1548         default:
1549                 RETURN(-EOPNOTSUPP);
1550         }
1551
1552         lfsck = lfsck_instance_find(key, true, false);
1553         if (unlikely(lfsck == NULL))
1554                 RETURN(-ENODEV);
1555
1556         com = lfsck_component_find(lfsck, lr->lr_active);
1557         if (likely(com != NULL)) {
1558                 rc = com->lc_ops->lfsck_in_notify(env, com, lr);
1559                 lfsck_component_put(env, com);
1560         } else {
1561                 rc = -ENOTSUPP;
1562         }
1563
1564         lfsck_instance_put(env, lfsck);
1565
1566         RETURN(rc);
1567 }
1568 EXPORT_SYMBOL(lfsck_in_notify);
1569
1570 int lfsck_query(const struct lu_env *env, struct dt_device *key,
1571                 struct lfsck_request *lr)
1572 {
1573         struct lfsck_instance  *lfsck;
1574         struct lfsck_component *com;
1575         int                     rc;
1576         ENTRY;
1577
1578         lfsck = lfsck_instance_find(key, true, false);
1579         if (unlikely(lfsck == NULL))
1580                 RETURN(-ENODEV);
1581
1582         com = lfsck_component_find(lfsck, lr->lr_active);
1583         if (likely(com != NULL)) {
1584                 rc = com->lc_ops->lfsck_query(env, com);
1585                 lfsck_component_put(env, com);
1586         } else {
1587                 rc = -ENOTSUPP;
1588         }
1589
1590         lfsck_instance_put(env, lfsck);
1591
1592         RETURN(rc);
1593 }
1594 EXPORT_SYMBOL(lfsck_query);
1595
1596 int lfsck_register(const struct lu_env *env, struct dt_device *key,
1597                    struct dt_device *next, struct obd_device *obd,
1598                    lfsck_out_notify notify, void *notify_data, bool master)
1599 {
1600         struct lfsck_instance   *lfsck;
1601         struct dt_object        *root  = NULL;
1602         struct dt_object        *obj;
1603         struct lu_fid           *fid   = &lfsck_env_info(env)->lti_fid;
1604         int                      rc;
1605         ENTRY;
1606
1607         lfsck = lfsck_instance_find(key, false, false);
1608         if (unlikely(lfsck != NULL))
1609                 RETURN(-EEXIST);
1610
1611         OBD_ALLOC_PTR(lfsck);
1612         if (lfsck == NULL)
1613                 RETURN(-ENOMEM);
1614
1615         mutex_init(&lfsck->li_mutex);
1616         spin_lock_init(&lfsck->li_lock);
1617         CFS_INIT_LIST_HEAD(&lfsck->li_link);
1618         CFS_INIT_LIST_HEAD(&lfsck->li_list_scan);
1619         CFS_INIT_LIST_HEAD(&lfsck->li_list_dir);
1620         CFS_INIT_LIST_HEAD(&lfsck->li_list_double_scan);
1621         CFS_INIT_LIST_HEAD(&lfsck->li_list_idle);
1622         atomic_set(&lfsck->li_ref, 1);
1623         atomic_set(&lfsck->li_double_scan_count, 0);
1624         init_waitqueue_head(&lfsck->li_thread.t_ctl_waitq);
1625         lfsck->li_out_notify = notify;
1626         lfsck->li_out_notify_data = notify_data;
1627         lfsck->li_next = next;
1628         lfsck->li_bottom = key;
1629         lfsck->li_obd = obd;
1630
1631         rc = lfsck_tgt_descs_init(&lfsck->li_ost_descs);
1632         if (rc != 0)
1633                 GOTO(out, rc);
1634
1635         rc = lfsck_tgt_descs_init(&lfsck->li_mdt_descs);
1636         if (rc != 0)
1637                 GOTO(out, rc);
1638
1639         fid->f_seq = FID_SEQ_LOCAL_NAME;
1640         fid->f_oid = 1;
1641         fid->f_ver = 0;
1642         rc = local_oid_storage_init(env, lfsck->li_bottom, fid, &lfsck->li_los);
1643         if (rc != 0)
1644                 GOTO(out, rc);
1645
1646         rc = dt_root_get(env, key, fid);
1647         if (rc != 0)
1648                 GOTO(out, rc);
1649
1650         root = dt_locate(env, lfsck->li_bottom, fid);
1651         if (IS_ERR(root))
1652                 GOTO(out, rc = PTR_ERR(root));
1653
1654         if (unlikely(!dt_try_as_dir(env, root)))
1655                 GOTO(out, rc = -ENOTDIR);
1656
1657         lfsck->li_local_root_fid = *fid;
1658         if (master) {
1659                 lfsck->li_master = 1;
1660                 if (lfsck_dev_idx(lfsck->li_bottom) == 0) {
1661                         rc = dt_lookup(env, root,
1662                                 (struct dt_rec *)(&lfsck->li_global_root_fid),
1663                                 (const struct dt_key *)"ROOT", BYPASS_CAPA);
1664                         if (rc != 0)
1665                                 GOTO(out, rc);
1666                 }
1667         }
1668
1669         fid->f_seq = FID_SEQ_LOCAL_FILE;
1670         fid->f_oid = OTABLE_IT_OID;
1671         fid->f_ver = 0;
1672         obj = dt_locate(env, lfsck->li_bottom, fid);
1673         if (IS_ERR(obj))
1674                 GOTO(out, rc = PTR_ERR(obj));
1675
1676         lfsck->li_obj_oit = obj;
1677         rc = obj->do_ops->do_index_try(env, obj, &dt_otable_features);
1678         if (rc != 0) {
1679                 if (rc == -ENOTSUPP)
1680                         GOTO(add, rc = 0);
1681
1682                 GOTO(out, rc);
1683         }
1684
1685         rc = lfsck_bookmark_setup(env, lfsck);
1686         if (rc != 0)
1687                 GOTO(out, rc);
1688
1689         if (master) {
1690                 rc = lfsck_namespace_setup(env, lfsck);
1691                 if (rc < 0)
1692                         GOTO(out, rc);
1693         }
1694
1695         rc = lfsck_layout_setup(env, lfsck);
1696         if (rc < 0)
1697                 GOTO(out, rc);
1698
1699         /* XXX: more LFSCK components initialization to be added here. */
1700
1701 add:
1702         rc = lfsck_instance_add(lfsck);
1703         if (rc == 0)
1704                 rc = lfsck_add_target_from_orphan(env, lfsck);
1705 out:
1706         if (root != NULL && !IS_ERR(root))
1707                 lu_object_put(env, &root->do_lu);
1708         if (rc != 0)
1709                 lfsck_instance_cleanup(env, lfsck);
1710         return rc;
1711 }
1712 EXPORT_SYMBOL(lfsck_register);
1713
1714 void lfsck_degister(const struct lu_env *env, struct dt_device *key)
1715 {
1716         struct lfsck_instance *lfsck;
1717
1718         lfsck = lfsck_instance_find(key, false, true);
1719         if (lfsck != NULL)
1720                 lfsck_instance_put(env, lfsck);
1721 }
1722 EXPORT_SYMBOL(lfsck_degister);
1723
1724 int lfsck_add_target(const struct lu_env *env, struct dt_device *key,
1725                      struct dt_device *tgt, struct obd_export *exp,
1726                      __u32 index, bool for_ost)
1727 {
1728         struct lfsck_instance   *lfsck;
1729         struct lfsck_tgt_desc   *ltd;
1730         int                      rc;
1731         ENTRY;
1732
1733         OBD_ALLOC_PTR(ltd);
1734         if (ltd == NULL)
1735                 RETURN(-ENOMEM);
1736
1737         ltd->ltd_tgt = tgt;
1738         ltd->ltd_key = key;
1739         ltd->ltd_exp = exp;
1740         INIT_LIST_HEAD(&ltd->ltd_orphan_list);
1741         INIT_LIST_HEAD(&ltd->ltd_layout_list);
1742         INIT_LIST_HEAD(&ltd->ltd_layout_phase_list);
1743         atomic_set(&ltd->ltd_ref, 1);
1744         ltd->ltd_index = index;
1745
1746         spin_lock(&lfsck_instance_lock);
1747         lfsck = __lfsck_instance_find(key, true, false);
1748         if (lfsck == NULL) {
1749                 if (for_ost)
1750                         list_add_tail(&ltd->ltd_orphan_list,
1751                                       &lfsck_ost_orphan_list);
1752                 else
1753                         list_add_tail(&ltd->ltd_orphan_list,
1754                                       &lfsck_mdt_orphan_list);
1755                 spin_unlock(&lfsck_instance_lock);
1756
1757                 RETURN(0);
1758         }
1759         spin_unlock(&lfsck_instance_lock);
1760
1761         rc = __lfsck_add_target(env, lfsck, ltd, for_ost, false);
1762         if (rc != 0)
1763                 lfsck_tgt_put(ltd);
1764
1765         lfsck_instance_put(env, lfsck);
1766
1767         RETURN(rc);
1768 }
1769 EXPORT_SYMBOL(lfsck_add_target);
1770
1771 void lfsck_del_target(const struct lu_env *env, struct dt_device *key,
1772                       struct dt_device *tgt, __u32 index, bool for_ost)
1773 {
1774         struct lfsck_instance   *lfsck;
1775         struct lfsck_tgt_descs  *ltds;
1776         struct lfsck_tgt_desc   *ltd;
1777         struct list_head        *head;
1778         bool                     found = false;
1779         bool                     stop  = false;
1780
1781         if (for_ost)
1782                 head = &lfsck_ost_orphan_list;
1783         else
1784                 head = &lfsck_mdt_orphan_list;
1785
1786         spin_lock(&lfsck_instance_lock);
1787         list_for_each_entry(ltd, head, ltd_orphan_list) {
1788                 if (ltd->ltd_tgt == tgt) {
1789                         list_del_init(&ltd->ltd_orphan_list);
1790                         spin_unlock(&lfsck_instance_lock);
1791                         lfsck_tgt_put(ltd);
1792
1793                         return;
1794                 }
1795         }
1796
1797         lfsck = __lfsck_instance_find(key, true, false);
1798         spin_unlock(&lfsck_instance_lock);
1799         if (unlikely(lfsck == NULL))
1800                 return;
1801
1802         if (for_ost)
1803                 ltds = &lfsck->li_ost_descs;
1804         else
1805                 ltds = &lfsck->li_mdt_descs;
1806
1807         down_write(&ltds->ltd_rw_sem);
1808
1809         LASSERT(ltds->ltd_tgts_bitmap != NULL);
1810
1811         if (unlikely(index >= ltds->ltd_tgts_bitmap->size))
1812                 goto unlock;
1813
1814         ltd = LTD_TGT(ltds, index);
1815         if (unlikely(ltd == NULL))
1816                 goto unlock;
1817
1818         found = true;
1819         spin_lock(&ltds->ltd_lock);
1820         ltd->ltd_dead = 1;
1821         if (!list_empty(&ltd->ltd_layout_list)) {
1822                 list_del_init(&ltd->ltd_layout_phase_list);
1823                 list_del_init(&ltd->ltd_layout_list);
1824                 stop = true;
1825         } else {
1826                 LASSERT(list_empty(&ltd->ltd_layout_phase_list));
1827         }
1828         spin_unlock(&ltds->ltd_lock);
1829
1830         if (stop && lfsck->li_master)
1831                 lfsck_stop_notify(env, lfsck, ltds, ltd);
1832
1833         LASSERT(ltds->ltd_tgtnr > 0);
1834
1835         ltds->ltd_tgtnr--;
1836         cfs_bitmap_clear(ltds->ltd_tgts_bitmap, index);
1837         LTD_TGT(ltds, index) = NULL;
1838         lfsck_tgt_put(ltd);
1839
1840 unlock:
1841         if (!found) {
1842                 if (for_ost)
1843                         head = &lfsck->li_ost_descs.ltd_orphan;
1844                 else
1845                         head = &lfsck->li_ost_descs.ltd_orphan;
1846
1847                 list_for_each_entry(ltd, head, ltd_orphan_list) {
1848                         if (ltd->ltd_tgt == tgt) {
1849                                 list_del_init(&ltd->ltd_orphan_list);
1850                                 lfsck_tgt_put(ltd);
1851                                 break;
1852                         }
1853                 }
1854         }
1855
1856         up_write(&ltds->ltd_rw_sem);
1857         lfsck_instance_put(env, lfsck);
1858 }
1859 EXPORT_SYMBOL(lfsck_del_target);
1860
1861 static int __init lfsck_init(void)
1862 {
1863         int rc;
1864
1865         INIT_LIST_HEAD(&lfsck_ost_orphan_list);
1866         INIT_LIST_HEAD(&lfsck_mdt_orphan_list);
1867         lfsck_key_init_generic(&lfsck_thread_key, NULL);
1868         rc = lu_context_key_register(&lfsck_thread_key);
1869         if (rc == 0) {
1870                 tgt_register_lfsck_start(lfsck_start);
1871                 tgt_register_lfsck_in_notify(lfsck_in_notify);
1872                 tgt_register_lfsck_query(lfsck_query);
1873         }
1874
1875         return rc;
1876 }
1877
1878 static void __exit lfsck_exit(void)
1879 {
1880         struct lfsck_tgt_desc *ltd;
1881         struct lfsck_tgt_desc *next;
1882
1883         LASSERT(cfs_list_empty(&lfsck_instance_list));
1884
1885         list_for_each_entry_safe(ltd, next, &lfsck_ost_orphan_list,
1886                                  ltd_orphan_list) {
1887                 list_del_init(&ltd->ltd_orphan_list);
1888                 lfsck_tgt_put(ltd);
1889         }
1890
1891         list_for_each_entry_safe(ltd, next, &lfsck_mdt_orphan_list,
1892                                  ltd_orphan_list) {
1893                 list_del_init(&ltd->ltd_orphan_list);
1894                 lfsck_tgt_put(ltd);
1895         }
1896
1897         lu_context_key_degister(&lfsck_thread_key);
1898 }
1899
1900 MODULE_AUTHOR("Intel Corporation <http://www.intel.com/>");
1901 MODULE_DESCRIPTION("LFSCK");
1902 MODULE_LICENSE("GPL");
1903
1904 cfs_module(lfsck, LUSTRE_VERSION_STRING, lfsck_init, lfsck_exit);