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         "broadcast",
  96         "orphan",
  97         "create_ostobj",
  98         NULL
  99 };
 100
 101 const char *lfsck_status2names(enum lfsck_status status)
 102 {
 103         if (unlikely(status < 0 || status >= LS_MAX))
 104                 return "unknown";
 105
 106         return lfsck_status_names[status];
 107 }
 108
 109 static int lfsck_tgt_descs_init(struct lfsck_tgt_descs *ltds)
 110 {
 111         spin_lock_init(&ltds->ltd_lock);
 112         init_rwsem(&ltds->ltd_rw_sem);
 113         INIT_LIST_HEAD(&ltds->ltd_orphan);
 114         ltds->ltd_tgts_bitmap = CFS_ALLOCATE_BITMAP(BITS_PER_LONG);
 115         if (ltds->ltd_tgts_bitmap == NULL)
 116                 return -ENOMEM;
 117
 118         return 0;
 119 }
 120
 121 static void lfsck_tgt_descs_fini(struct lfsck_tgt_descs *ltds)
 122 {
 123         struct lfsck_tgt_desc   *ltd;
 124         struct lfsck_tgt_desc   *next;
 125         int                      idx;
 126
 127         down_write(&ltds->ltd_rw_sem);
 128
 129         list_for_each_entry_safe(ltd, next, &ltds->ltd_orphan,
 130                                  ltd_orphan_list) {
 131                 list_del_init(&ltd->ltd_orphan_list);
 132                 lfsck_tgt_put(ltd);
 133         }
 134
 135         if (unlikely(ltds->ltd_tgts_bitmap == NULL)) {
 136                 up_write(&ltds->ltd_rw_sem);
 137
 138                 return;
 139         }
 140
 141         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
 142                 ltd = LTD_TGT(ltds, idx);
 143                 if (likely(ltd != NULL)) {
 144                         LASSERT(list_empty(&ltd->ltd_layout_list));
 145                         LASSERT(list_empty(&ltd->ltd_layout_phase_list));
 146
 147                         ltds->ltd_tgtnr--;
 148                         cfs_bitmap_clear(ltds->ltd_tgts_bitmap, idx);
 149                         LTD_TGT(ltds, idx) = NULL;
 150                         lfsck_tgt_put(ltd);
 151                 }
 152         }
 153
 154         LASSERTF(ltds->ltd_tgtnr == 0, "tgt count unmatched: %d\n",
 155                  ltds->ltd_tgtnr);
 156
 157         for (idx = 0; idx < TGT_PTRS; idx++) {
 158                 if (ltds->ltd_tgts_idx[idx] != NULL) {
 159                         OBD_FREE_PTR(ltds->ltd_tgts_idx[idx]);
 160                         ltds->ltd_tgts_idx[idx] = NULL;
 161                 }
 162         }
 163
 164         CFS_FREE_BITMAP(ltds->ltd_tgts_bitmap);
 165         ltds->ltd_tgts_bitmap = NULL;
 166         up_write(&ltds->ltd_rw_sem);
 167 }
 168
 169 static int __lfsck_add_target(const struct lu_env *env,
 170                               struct lfsck_instance *lfsck,
 171                               struct lfsck_tgt_desc *ltd,
 172                               bool for_ost, bool locked)
 173 {
 174         struct lfsck_tgt_descs *ltds;
 175         __u32                   index = ltd->ltd_index;
 176         int                     rc    = 0;
 177         ENTRY;
 178
 179         if (for_ost)
 180                 ltds = &lfsck->li_ost_descs;
 181         else
 182                 ltds = &lfsck->li_mdt_descs;
 183
 184         if (!locked)
 185                 down_write(&ltds->ltd_rw_sem);
 186
 187         LASSERT(ltds->ltd_tgts_bitmap != NULL);
 188
 189         if (index >= ltds->ltd_tgts_bitmap->size) {
 190                 __u32 newsize = max((__u32)ltds->ltd_tgts_bitmap->size,
 191                                     (__u32)BITS_PER_LONG);
 192                 cfs_bitmap_t *old_bitmap = ltds->ltd_tgts_bitmap;
 193                 cfs_bitmap_t *new_bitmap;
 194
 195                 while (newsize < index + 1)
 196                         newsize <<= 1;
 197
 198                 new_bitmap = CFS_ALLOCATE_BITMAP(newsize);
 199                 if (new_bitmap == NULL)
 200                         GOTO(unlock, rc = -ENOMEM);
 201
 202                 if (ltds->ltd_tgtnr > 0)
 203                         cfs_bitmap_copy(new_bitmap, old_bitmap);
 204                 ltds->ltd_tgts_bitmap = new_bitmap;
 205                 CFS_FREE_BITMAP(old_bitmap);
 206         }
 207
 208         if (cfs_bitmap_check(ltds->ltd_tgts_bitmap, index)) {
 209                 CERROR("%s: the device %s (%u) is registered already\n",
 210                        lfsck_lfsck2name(lfsck),
 211                        ltd->ltd_tgt->dd_lu_dev.ld_obd->obd_name, index);
 212                 GOTO(unlock, rc = -EEXIST);
 213         }
 214
 215         if (ltds->ltd_tgts_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
 216                 OBD_ALLOC_PTR(ltds->ltd_tgts_idx[index / TGT_PTRS_PER_BLOCK]);
 217                 if (ltds->ltd_tgts_idx[index / TGT_PTRS_PER_BLOCK] == NULL)
 218                         GOTO(unlock, rc = -ENOMEM);
 219         }
 220
 221         LTD_TGT(ltds, index) = ltd;
 222         cfs_bitmap_set(ltds->ltd_tgts_bitmap, index);
 223         ltds->ltd_tgtnr++;
 224
 225         GOTO(unlock, rc = 0);
 226
 227 unlock:
 228         if (!locked)
 229                 up_write(&ltds->ltd_rw_sem);
 230
 231         return rc;
 232 }
 233
 234 static int lfsck_add_target_from_orphan(const struct lu_env *env,
 235                                         struct lfsck_instance *lfsck)
 236 {
 237         struct lfsck_tgt_descs  *ltds    = &lfsck->li_ost_descs;
 238         struct lfsck_tgt_desc   *ltd;
 239         struct lfsck_tgt_desc   *next;
 240         struct list_head        *head    = &lfsck_ost_orphan_list;
 241         int                      rc;
 242         bool                     for_ost = true;
 243
 244 again:
 245         spin_lock(&lfsck_instance_lock);
 246         list_for_each_entry_safe(ltd, next, head, ltd_orphan_list) {
 247                 if (ltd->ltd_key == lfsck->li_bottom) {
 248                         list_del_init(&ltd->ltd_orphan_list);
 249                         list_add_tail(&ltd->ltd_orphan_list,
 250                                       &ltds->ltd_orphan);
 251                 }
 252         }
 253         spin_unlock(&lfsck_instance_lock);
 254
 255         down_write(&ltds->ltd_rw_sem);
 256         while (!list_empty(&ltds->ltd_orphan)) {
 257                 ltd = list_entry(ltds->ltd_orphan.next,
 258                                  struct lfsck_tgt_desc,
 259                                  ltd_orphan_list);
 260                 list_del_init(&ltd->ltd_orphan_list);
 261                 rc = __lfsck_add_target(env, lfsck, ltd, for_ost, true);
 262                 /* Do not hold the semaphore for too long time. */
 263                 up_write(&ltds->ltd_rw_sem);
 264                 if (rc != 0)
 265                         return rc;
 266
 267                 down_write(&ltds->ltd_rw_sem);
 268         }
 269         up_write(&ltds->ltd_rw_sem);
 270
 271         if (for_ost) {
 272                 ltds = &lfsck->li_mdt_descs;
 273                 head = &lfsck_mdt_orphan_list;
 274                 for_ost = false;
 275                 goto again;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static inline struct lfsck_component *
 282 __lfsck_component_find(struct lfsck_instance *lfsck, __u16 type, cfs_list_t *list)
 283 {
 284         struct lfsck_component *com;
 285
 286         cfs_list_for_each_entry(com, list, lc_link) {
 287                 if (com->lc_type == type)
 288                         return com;
 289         }
 290         return NULL;
 291 }
 292
 293 struct lfsck_component *
 294 lfsck_component_find(struct lfsck_instance *lfsck, __u16 type)
 295 {
 296         struct lfsck_component *com;
 297
 298         spin_lock(&lfsck->li_lock);
 299         com = __lfsck_component_find(lfsck, type, &lfsck->li_list_scan);
 300         if (com != NULL)
 301                 goto unlock;
 302
 303         com = __lfsck_component_find(lfsck, type,
 304                                      &lfsck->li_list_double_scan);
 305         if (com != NULL)
 306                 goto unlock;
 307
 308         com = __lfsck_component_find(lfsck, type, &lfsck->li_list_idle);
 309
 310 unlock:
 311         if (com != NULL)
 312                 lfsck_component_get(com);
 313         spin_unlock(&lfsck->li_lock);
 314         return com;
 315 }
 316
 317 void lfsck_component_cleanup(const struct lu_env *env,
 318                              struct lfsck_component *com)
 319 {
 320         if (!cfs_list_empty(&com->lc_link))
 321                 cfs_list_del_init(&com->lc_link);
 322         if (!cfs_list_empty(&com->lc_link_dir))
 323                 cfs_list_del_init(&com->lc_link_dir);
 324
 325         lfsck_component_put(env, com);
 326 }
 327
 328 int lfsck_fid_alloc(const struct lu_env *env, struct lfsck_instance *lfsck,
 329                     struct lu_fid *fid, bool locked)
 330 {
 331         struct lfsck_bookmark   *bk = &lfsck->li_bookmark_ram;
 332         int                      rc = 0;
 333         ENTRY;
 334
 335         if (!locked)
 336                 mutex_lock(&lfsck->li_mutex);
 337
 338         rc = seq_client_alloc_fid(env, lfsck->li_seq, fid);
 339         if (rc >= 0) {
 340                 bk->lb_last_fid = *fid;
 341                 /* We do not care about whether the subsequent sub-operations
 342                  * failed or not. The worst case is that one FID is lost that
 343                  * is not a big issue for the LFSCK since it is relative rare
 344                  * for LFSCK create. */
 345                 rc = lfsck_bookmark_store(env, lfsck);
 346         }
 347
 348         if (!locked)
 349                 mutex_unlock(&lfsck->li_mutex);
 350
 351         RETURN(rc);
 352 }
 353
 354 static const char dot[] = ".";
 355 static const char dotdot[] = "..";
 356
 357 static int lfsck_create_lpf_local(const struct lu_env *env,
 358                                   struct lfsck_instance *lfsck,
 359                                   struct dt_object *parent,
 360                                   struct dt_object *child,
 361                                   struct lu_attr *la,
 362                                   struct dt_object_format *dof,
 363                                   const char *name)
 364 {
 365         struct dt_device        *dev    = lfsck->li_bottom;
 366         struct lfsck_bookmark   *bk     = &lfsck->li_bookmark_ram;
 367         struct dt_object        *bk_obj = lfsck->li_bookmark_obj;
 368         const struct lu_fid     *cfid   = lu_object_fid(&child->do_lu);
 369         struct thandle          *th     = NULL;
 370         loff_t                   pos    = 0;
 371         int                      len    = sizeof(struct lfsck_bookmark);
 372         int                      rc     = 0;
 373         ENTRY;
 374
 375         th = dt_trans_create(env, dev);
 376         if (IS_ERR(th))
 377                 RETURN(PTR_ERR(th));
 378
 379         /* 1a. create child */
 380         rc = dt_declare_create(env, child, la, NULL, dof, th);
 381         if (rc != 0)
 382                 GOTO(stop, rc);
 383
 384         /* 2a. increase child nlink */
 385         rc = dt_declare_ref_add(env, child, th);
 386         if (rc != 0)
 387                 GOTO(stop, rc);
 388
 389         /* 3a. insert name into parent dir */
 390         rc = dt_declare_insert(env, parent, (const struct dt_rec *)cfid,
 391                                (const struct dt_key *)name, th);
 392         if (rc != 0)
 393                 GOTO(stop, rc);
 394
 395         /* 4a. increase parent nlink */
 396         rc = dt_declare_ref_add(env, parent, th);
 397         if (rc != 0)
 398                 GOTO(stop, rc);
 399
 400         /* 5a. update bookmark */
 401         rc = dt_declare_record_write(env, bk_obj,
 402                                      lfsck_buf_get(env, bk, len), 0, th);
 403         if (rc != 0)
 404                 GOTO(stop, rc);
 405
 406         rc = dt_trans_start_local(env, dev, th);
 407         if (rc != 0)
 408                 GOTO(stop, rc);
 409
 410         dt_write_lock(env, child, 0);
 411         /* 1b.1 create child */
 412         rc = dt_create(env, child, la, NULL, dof, th);
 413         if (rc != 0)
 414                 GOTO(unlock, rc);
 415
 416         if (unlikely(!dt_try_as_dir(env, child)))
 417                 GOTO(unlock, rc = -ENOTDIR);
 418
 419         /* 1b.2 insert dot into child dir */
 420         rc = dt_insert(env, child, (const struct dt_rec *)cfid,
 421                        (const struct dt_key *)dot, th, BYPASS_CAPA, 1);
 422         if (rc != 0)
 423                 GOTO(unlock, rc);
 424
 425         /* 1b.3 insert dotdot into child dir */
 426         rc = dt_insert(env, child, (const struct dt_rec *)&LU_LPF_FID,
 427                        (const struct dt_key *)dotdot, th, BYPASS_CAPA, 1);
 428         if (rc != 0)
 429                 GOTO(unlock, rc);
 430
 431         /* 2b. increase child nlink */
 432         rc = dt_ref_add(env, child, th);
 433         dt_write_unlock(env, child);
 434         if (rc != 0)
 435                 GOTO(stop, rc);
 436
 437         /* 3b. insert name into parent dir */
 438         rc = dt_insert(env, parent, (const struct dt_rec *)cfid,
 439                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
 440         if (rc != 0)
 441                 GOTO(stop, rc);
 442
 443         dt_write_lock(env, parent, 0);
 444         /* 4b. increase parent nlink */
 445         rc = dt_ref_add(env, parent, th);
 446         dt_write_unlock(env, parent);
 447         if (rc != 0)
 448                 GOTO(stop, rc);
 449
 450         bk->lb_lpf_fid = *cfid;
 451         lfsck_bookmark_cpu_to_le(&lfsck->li_bookmark_disk, bk);
 452
 453         /* 5b. update bookmark */
 454         rc = dt_record_write(env, bk_obj,
 455                              lfsck_buf_get(env, bk, len), &pos, th);
 456
 457         GOTO(stop, rc);
 458
 459 unlock:
 460         dt_write_unlock(env, child);
 461
 462 stop:
 463         dt_trans_stop(env, dev, th);
 464
 465         return rc;
 466 }
 467
 468 static int lfsck_create_lpf_remote(const struct lu_env *env,
 469                                    struct lfsck_instance *lfsck,
 470                                    struct dt_object *parent,
 471                                    struct dt_object *child,
 472                                    struct lu_attr *la,
 473                                    struct dt_object_format *dof,
 474                                    const char *name)
 475 {
 476         struct lfsck_bookmark   *bk     = &lfsck->li_bookmark_ram;
 477         struct dt_object        *bk_obj = lfsck->li_bookmark_obj;
 478         const struct lu_fid     *cfid   = lu_object_fid(&child->do_lu);
 479         struct thandle          *th     = NULL;
 480         struct dt_device        *dev;
 481         loff_t                   pos    = 0;
 482         int                      len    = sizeof(struct lfsck_bookmark);
 483         int                      rc     = 0;
 484         ENTRY;
 485
 486         /* Create .lustre/lost+found/MDTxxxx. */
 487
 488         /* XXX: Currently, cross-MDT create operation needs to create the child
 489          *      object firstly, then insert name into the parent directory. For
 490          *      this case, the child object resides on current MDT (local), but
 491          *      the parent ".lustre/lost+found" may be on remote MDT. It is not
 492          *      easy to contain all the sub-modifications orderly within single
 493          *      transaction.
 494          *
 495          *      To avoid more inconsistency, we split the create operation into
 496          *      two transactions:
 497          *
 498          *      1) create the child locally.
 499          *      2) insert the name "MDTXXXX" in the parent ".lustre/lost+found"
 500          *         remotely and update the lfsck_bookmark::lb_lpf_fid locally.
 501          *
 502          *      If 1) done but 2) failed, then the worst case is that we lose
 503          *      one object locally, which is not a big issue. (can be repaird
 504          *      by LFSCK phase III) */
 505
 506         /* Transaction I: */
 507
 508         dev = lfsck->li_bottom;
 509         th = dt_trans_create(env, dev);
 510         if (IS_ERR(th))
 511                 RETURN(PTR_ERR(th));
 512
 513         /* 1a. create child locally. */
 514         rc = dt_declare_create(env, child, la, NULL, dof, th);
 515         if (rc != 0)
 516                 GOTO(stop, rc);
 517
 518         /* 2a. increase child nlink locally. */
 519         rc = dt_declare_ref_add(env, child, th);
 520         if (rc != 0)
 521                 GOTO(stop, rc);
 522
 523         rc = dt_trans_start_local(env, dev, th);
 524         if (rc != 0)
 525                 GOTO(stop, rc);
 526
 527         dt_write_lock(env, child, 0);
 528         /* 1b. create child locally. */
 529         rc = dt_create(env, child, la, NULL, dof, th);
 530         if (rc != 0)
 531                 GOTO(unlock, rc);
 532
 533         if (unlikely(!dt_try_as_dir(env, child)))
 534                 GOTO(unlock, rc = -ENOTDIR);
 535
 536         /* 2b.1 insert dot into child dir locally. */
 537         rc = dt_insert(env, child, (const struct dt_rec *)cfid,
 538                        (const struct dt_key *)dot, th, BYPASS_CAPA, 1);
 539         if (rc != 0)
 540                 GOTO(unlock, rc);
 541
 542         /* 2b.2 insert dotdot into child dir locally. */
 543         rc = dt_insert(env, child, (const struct dt_rec *)&LU_LPF_FID,
 544                        (const struct dt_key *)dotdot, th, BYPASS_CAPA, 1);
 545         if (rc != 0)
 546                 GOTO(unlock, rc);
 547
 548         /* 2b.3 increase child nlink locally. */
 549         rc = dt_ref_add(env, child, th);
 550         dt_write_unlock(env, child);
 551         dt_trans_stop(env, dev, th);
 552         if (rc != 0)
 553                 RETURN(rc);
 554
 555         /* Transaction II: */
 556
 557         dev = lfsck->li_next;
 558         th = dt_trans_create(env, dev);
 559         if (IS_ERR(th))
 560                 RETURN(PTR_ERR(th));
 561
 562         /* 3a. insert name into parent dir remotely. */
 563         rc = dt_declare_insert(env, parent, (const struct dt_rec *)cfid,
 564                                (const struct dt_key *)name, th);
 565         if (rc != 0)
 566                 GOTO(stop, rc);
 567
 568         /* 4a. increase parent nlink remotely. */
 569         rc = dt_declare_ref_add(env, parent, th);
 570         if (rc != 0)
 571                 GOTO(stop, rc);
 572
 573         /* 5a. decrease child nlink for dotdot locally if former remote
 574          *     update failed. */
 575         rc = dt_declare_ref_del(env, child, th);
 576         if (rc != 0)
 577                 GOTO(stop, rc);
 578
 579         /* 6a. decrease child nlink for dot locally if former remote
 580          *     update failed. */
 581         rc = dt_declare_ref_del(env, child, th);
 582         if (rc != 0)
 583                 GOTO(stop, rc);
 584
 585         /* 7a. destroy child locally if former remote update failed. */
 586         rc = dt_declare_destroy(env, child, th);
 587         if (rc != 0)
 588                 GOTO(stop, rc);
 589
 590         /* 8a. update bookmark locally. */
 591         rc = dt_declare_record_write(env, bk_obj,
 592                                      lfsck_buf_get(env, bk, len), 0, th);
 593         if (rc != 0)
 594                 GOTO(stop, rc);
 595
 596         rc = dt_trans_start(env, dev, th);
 597         if (rc != 0)
 598                 GOTO(stop, rc);
 599
 600         /* 3b. insert name into parent dir remotely. */
 601         rc = dt_insert(env, parent, (const struct dt_rec *)cfid,
 602                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
 603         if (rc == 0) {
 604                 dt_write_lock(env, parent, 0);
 605                 /* 4b. increase parent nlink remotely. */
 606                 rc = dt_ref_add(env, parent, th);
 607                 dt_write_unlock(env, parent);
 608         }
 609         if (rc != 0) {
 610                 /* 5b. decrease child nlink for dotdot locally. */
 611                 dt_ref_del(env, child, th);
 612                 /* 6b. decrease child nlink for dot locally. */
 613                 dt_ref_del(env, child, th);
 614                 /* 7b. destroy child locally. */
 615                 dt_destroy(env, child, th);
 616                 GOTO(stop, rc);
 617         }
 618
 619         bk->lb_lpf_fid = *cfid;
 620         lfsck_bookmark_cpu_to_le(&lfsck->li_bookmark_disk, bk);
 621
 622         /* 8b. update bookmark locally. */
 623         rc = dt_record_write(env, bk_obj,
 624                              lfsck_buf_get(env, bk, len), &pos, th);
 625
 626         GOTO(stop, rc);
 627
 628 unlock:
 629         dt_write_unlock(env, child);
 630 stop:
 631         dt_trans_stop(env, dev, th);
 632
 633         return rc;
 634 }
 635
 636 /* Do NOT create .lustre/lost+found/MDTxxxx when register the lfsck instance,
 637  * because the MDT0 maybe not reaady for sequence allocation yet. We do that
 638  * only when it is required, such as orphan OST-objects repairing. */
 639 int lfsck_create_lpf(const struct lu_env *env, struct lfsck_instance *lfsck)
 640 {
 641         struct lfsck_bookmark    *bk    = &lfsck->li_bookmark_ram;
 642         struct lfsck_thread_info *info  = lfsck_env_info(env);
 643         struct lu_fid            *cfid  = &info->lti_fid2;
 644         struct lu_attr           *la    = &info->lti_la;
 645         struct dt_object_format  *dof   = &info->lti_dof;
 646         struct dt_object         *parent = NULL;
 647         struct dt_object         *child = NULL;
 648         char                      name[8];
 649         int                       node  = lfsck_dev_idx(lfsck->li_bottom);
 650         int                       rc    = 0;
 651         ENTRY;
 652
 653         LASSERT(lfsck->li_master);
 654
 655         sprintf(name, "MDT%04x", node);
 656         if (node == 0) {
 657                 parent = lfsck_object_find_by_dev(env, lfsck->li_bottom,
 658                                                   &LU_LPF_FID);
 659         } else {
 660                 struct lfsck_tgt_desc *ltd;
 661
 662                 ltd = lfsck_tgt_get(&lfsck->li_mdt_descs, 0);
 663                 if (unlikely(ltd == NULL))
 664                         RETURN(-ENXIO);
 665
 666                 parent = lfsck_object_find_by_dev(env, ltd->ltd_tgt,
 667                                                   &LU_LPF_FID);
 668                 lfsck_tgt_put(ltd);
 669         }
 670         if (IS_ERR(parent))
 671                 RETURN(PTR_ERR(parent));
 672
 673         if (unlikely(!dt_try_as_dir(env, parent)))
 674                 GOTO(out, rc = -ENOTDIR);
 675
 676         mutex_lock(&lfsck->li_mutex);
 677         if (lfsck->li_lpf_obj != NULL)
 678                 GOTO(unlock, rc = 0);
 679
 680         if (fid_is_zero(&bk->lb_lpf_fid)) {
 681                 /* There is corner case that: in former LFSCK scanning we have
 682                  * created the .lustre/lost+found/MDTxxxx but failed to update
 683                  * the lfsck_bookmark::lb_lpf_fid successfully. So need lookup
 684                  * it from MDT0 firstly. */
 685                 rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
 686                                (const struct dt_key *)name, BYPASS_CAPA);
 687                 if (rc != 0 && rc != -ENOENT)
 688                         GOTO(unlock, rc);
 689
 690                 if (rc == 0) {
 691                         bk->lb_lpf_fid = *cfid;
 692                         rc = lfsck_bookmark_store(env, lfsck);
 693                 } else {
 694                         rc = lfsck_fid_alloc(env, lfsck, cfid, true);
 695                 }
 696                 if (rc != 0)
 697                         GOTO(unlock, rc);
 698         } else {
 699                 *cfid = bk->lb_lpf_fid;
 700         }
 701
 702         child = lfsck_object_find_by_dev(env, lfsck->li_bottom, cfid);
 703         if (IS_ERR(child))
 704                 GOTO(unlock, rc = PTR_ERR(child));
 705
 706         if (dt_object_exists(child) != 0) {
 707                 if (unlikely(!dt_try_as_dir(env, child)))
 708                         GOTO(unlock, rc = -ENOTDIR);
 709
 710                 lfsck->li_lpf_obj = child;
 711                 GOTO(unlock, rc = 0);
 712         }
 713
 714         memset(la, 0, sizeof(*la));
 715         la->la_atime = la->la_mtime = la->la_ctime = cfs_time_current_sec();
 716         la->la_mode = S_IFDIR | S_IRWXU;
 717         la->la_valid = LA_ATIME | LA_MTIME | LA_CTIME | LA_MODE |
 718                        LA_UID | LA_GID;
 719         memset(dof, 0, sizeof(*dof));
 720         dof->dof_type = dt_mode_to_dft(S_IFDIR);
 721
 722         if (node == 0)
 723                 rc = lfsck_create_lpf_local(env, lfsck, parent, child, la,
 724                                             dof, name);
 725         else
 726                 rc = lfsck_create_lpf_remote(env, lfsck, parent, child, la,
 727                                              dof, name);
 728         if (rc == 0)
 729                 lfsck->li_lpf_obj = child;
 730
 731         GOTO(unlock, rc);
 732
 733 unlock:
 734         mutex_unlock(&lfsck->li_mutex);
 735         if (rc != 0 && child != NULL && !IS_ERR(child))
 736                 lu_object_put(env, &child->do_lu);
 737 out:
 738         if (parent != NULL && !IS_ERR(parent))
 739                 lu_object_put(env, &parent->do_lu);
 740
 741         return rc;
 742 }
 743
 744 static int lfsck_fid_init(struct lfsck_instance *lfsck)
 745 {
 746         struct lfsck_bookmark   *bk     = &lfsck->li_bookmark_ram;
 747         struct seq_server_site  *ss;
 748         char                    *prefix;
 749         int                      rc     = 0;
 750         ENTRY;
 751
 752         ss = lu_site2seq(lfsck->li_bottom->dd_lu_dev.ld_site);
 753         if (unlikely(ss == NULL))
 754                 RETURN(-ENXIO);
 755
 756         OBD_ALLOC_PTR(lfsck->li_seq);
 757         if (lfsck->li_seq == NULL)
 758                 RETURN(-ENOMEM);
 759
 760         OBD_ALLOC(prefix, MAX_OBD_NAME + 7);
 761         if (prefix == NULL)
 762                 GOTO(out, rc = -ENOMEM);
 763
 764         snprintf(prefix, MAX_OBD_NAME + 7, "lfsck-%s", lfsck_lfsck2name(lfsck));
 765         rc = seq_client_init(lfsck->li_seq, NULL, LUSTRE_SEQ_METADATA, prefix,
 766                              ss->ss_server_seq);
 767         OBD_FREE(prefix, MAX_OBD_NAME + 7);
 768         if (rc != 0)
 769                 GOTO(out, rc);
 770
 771         if (fid_is_sane(&bk->lb_last_fid))
 772                 lfsck->li_seq->lcs_fid = bk->lb_last_fid;
 773
 774         RETURN(0);
 775
 776 out:
 777         OBD_FREE_PTR(lfsck->li_seq);
 778         lfsck->li_seq = NULL;
 779
 780         return rc;
 781 }
 782
 783 static void lfsck_fid_fini(struct lfsck_instance *lfsck)
 784 {
 785         if (lfsck->li_seq != NULL) {
 786                 seq_client_fini(lfsck->li_seq);
 787                 OBD_FREE_PTR(lfsck->li_seq);
 788                 lfsck->li_seq = NULL;
 789         }
 790 }
 791
 792 void lfsck_instance_cleanup(const struct lu_env *env,
 793                             struct lfsck_instance *lfsck)
 794 {
 795         struct ptlrpc_thread    *thread = &lfsck->li_thread;
 796         struct lfsck_component  *com;
 797         ENTRY;
 798
 799         LASSERT(list_empty(&lfsck->li_link));
 800         LASSERT(thread_is_init(thread) || thread_is_stopped(thread));
 801
 802         if (lfsck->li_obj_oit != NULL) {
 803                 lu_object_put_nocache(env, &lfsck->li_obj_oit->do_lu);
 804                 lfsck->li_obj_oit = NULL;
 805         }
 806
 807         LASSERT(lfsck->li_obj_dir == NULL);
 808
 809         while (!cfs_list_empty(&lfsck->li_list_scan)) {
 810                 com = cfs_list_entry(lfsck->li_list_scan.next,
 811                                      struct lfsck_component,
 812                                      lc_link);
 813                 lfsck_component_cleanup(env, com);
 814         }
 815
 816         LASSERT(cfs_list_empty(&lfsck->li_list_dir));
 817
 818         while (!cfs_list_empty(&lfsck->li_list_double_scan)) {
 819                 com = cfs_list_entry(lfsck->li_list_double_scan.next,
 820                                      struct lfsck_component,
 821                                      lc_link);
 822                 lfsck_component_cleanup(env, com);
 823         }
 824
 825         while (!cfs_list_empty(&lfsck->li_list_idle)) {
 826                 com = cfs_list_entry(lfsck->li_list_idle.next,
 827                                      struct lfsck_component,
 828                                      lc_link);
 829                 lfsck_component_cleanup(env, com);
 830         }
 831
 832         lfsck_tgt_descs_fini(&lfsck->li_ost_descs);
 833         lfsck_tgt_descs_fini(&lfsck->li_mdt_descs);
 834
 835         if (lfsck->li_bookmark_obj != NULL) {
 836                 lu_object_put_nocache(env, &lfsck->li_bookmark_obj->do_lu);
 837                 lfsck->li_bookmark_obj = NULL;
 838         }
 839
 840         if (lfsck->li_lpf_obj != NULL) {
 841                 lu_object_put(env, &lfsck->li_lpf_obj->do_lu);
 842                 lfsck->li_lpf_obj = NULL;
 843         }
 844
 845         if (lfsck->li_los != NULL) {
 846                 local_oid_storage_fini(env, lfsck->li_los);
 847                 lfsck->li_los = NULL;
 848         }
 849
 850         lfsck_fid_fini(lfsck);
 851
 852         OBD_FREE_PTR(lfsck);
 853 }
 854
 855 static inline struct lfsck_instance *
 856 __lfsck_instance_find(struct dt_device *key, bool ref, bool unlink)
 857 {
 858         struct lfsck_instance *lfsck;
 859
 860         cfs_list_for_each_entry(lfsck, &lfsck_instance_list, li_link) {
 861                 if (lfsck->li_bottom == key) {
 862                         if (ref)
 863                                 lfsck_instance_get(lfsck);
 864                         if (unlink)
 865                                 list_del_init(&lfsck->li_link);
 866
 867                         return lfsck;
 868                 }
 869         }
 870
 871         return NULL;
 872 }
 873
 874 struct lfsck_instance *lfsck_instance_find(struct dt_device *key, bool ref,
 875                                            bool unlink)
 876 {
 877         struct lfsck_instance *lfsck;
 878
 879         spin_lock(&lfsck_instance_lock);
 880         lfsck = __lfsck_instance_find(key, ref, unlink);
 881         spin_unlock(&lfsck_instance_lock);
 882
 883         return lfsck;
 884 }
 885
 886 static inline int lfsck_instance_add(struct lfsck_instance *lfsck)
 887 {
 888         struct lfsck_instance *tmp;
 889
 890         spin_lock(&lfsck_instance_lock);
 891         cfs_list_for_each_entry(tmp, &lfsck_instance_list, li_link) {
 892                 if (lfsck->li_bottom == tmp->li_bottom) {
 893                         spin_unlock(&lfsck_instance_lock);
 894                         return -EEXIST;
 895                 }
 896         }
 897
 898         cfs_list_add_tail(&lfsck->li_link, &lfsck_instance_list);
 899         spin_unlock(&lfsck_instance_lock);
 900         return 0;
 901 }
 902
 903 int lfsck_bits_dump(char **buf, int *len, int bits, const char *names[],
 904                     const char *prefix)
 905 {
 906         int save = *len;
 907         int flag;
 908         int rc;
 909         int i;
 910         bool newline = (bits != 0 ? false : true);
 911
 912         rc = snprintf(*buf, *len, "%s:%c", prefix, newline ? '\n' : ' ');
 913         if (rc <= 0)
 914                 return -ENOSPC;
 915
 916         *buf += rc;
 917         *len -= rc;
 918         for (i = 0, flag = 1; bits != 0; i++, flag = 1 << i) {
 919                 if (flag & bits) {
 920                         bits &= ~flag;
 921                         if (names[i] != NULL) {
 922                                 if (bits == 0)
 923                                         newline = true;
 924
 925                                 rc = snprintf(*buf, *len, "%s%c", names[i],
 926                                               newline ? '\n' : ',');
 927                                 if (rc <= 0)
 928                                         return -ENOSPC;
 929
 930                                 *buf += rc;
 931                                 *len -= rc;
 932                         }
 933                 }
 934         }
 935
 936         if (!newline) {
 937                 rc = snprintf(*buf, *len, "\n");
 938                 if (rc <= 0)
 939                         return -ENOSPC;
 940
 941                 *buf += rc;
 942                 *len -= rc;
 943         }
 944
 945         return save - *len;
 946 }
 947
 948 int lfsck_time_dump(char **buf, int *len, __u64 time, const char *prefix)
 949 {
 950         int rc;
 951
 952         if (time != 0)
 953                 rc = snprintf(*buf, *len, "%s: "LPU64" seconds\n", prefix,
 954                               cfs_time_current_sec() - time);
 955         else
 956                 rc = snprintf(*buf, *len, "%s: N/A\n", prefix);
 957         if (rc <= 0)
 958                 return -ENOSPC;
 959
 960         *buf += rc;
 961         *len -= rc;
 962         return rc;
 963 }
 964
 965 int lfsck_pos_dump(char **buf, int *len, struct lfsck_position *pos,
 966                    const char *prefix)
 967 {
 968         int rc;
 969
 970         if (fid_is_zero(&pos->lp_dir_parent)) {
 971                 if (pos->lp_oit_cookie == 0)
 972                         rc = snprintf(*buf, *len, "%s: N/A, N/A, N/A\n",
 973                                       prefix);
 974                 else
 975                         rc = snprintf(*buf, *len, "%s: "LPU64", N/A, N/A\n",
 976                                       prefix, pos->lp_oit_cookie);
 977         } else {
 978                 rc = snprintf(*buf, *len, "%s: "LPU64", "DFID", "LPU64"\n",
 979                               prefix, pos->lp_oit_cookie,
 980                               PFID(&pos->lp_dir_parent), pos->lp_dir_cookie);
 981         }
 982         if (rc <= 0)
 983                 return -ENOSPC;
 984
 985         *buf += rc;
 986         *len -= rc;
 987         return rc;
 988 }
 989
 990 void lfsck_pos_fill(const struct lu_env *env, struct lfsck_instance *lfsck,
 991                     struct lfsck_position *pos, bool init)
 992 {
 993         const struct dt_it_ops *iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
 994
 995         if (unlikely(lfsck->li_di_oit == NULL)) {
 996                 memset(pos, 0, sizeof(*pos));
 997                 return;
 998         }
 999
1000         pos->lp_oit_cookie = iops->store(env, lfsck->li_di_oit);
1001         if (!lfsck->li_current_oit_processed && !init)
1002                 pos->lp_oit_cookie--;
1003
1004         LASSERT(pos->lp_oit_cookie > 0);
1005
1006         if (lfsck->li_di_dir != NULL) {
1007                 struct dt_object *dto = lfsck->li_obj_dir;
1008
1009                 pos->lp_dir_cookie = dto->do_index_ops->dio_it.store(env,
1010                                                         lfsck->li_di_dir);
1011
1012                 if (pos->lp_dir_cookie >= MDS_DIR_END_OFF) {
1013                         fid_zero(&pos->lp_dir_parent);
1014                         pos->lp_dir_cookie = 0;
1015                 } else {
1016                         pos->lp_dir_parent = *lfsck_dto2fid(dto);
1017                 }
1018         } else {
1019                 fid_zero(&pos->lp_dir_parent);
1020                 pos->lp_dir_cookie = 0;
1021         }
1022 }
1023
1024 bool __lfsck_set_speed(struct lfsck_instance *lfsck, __u32 limit)
1025 {
1026         bool dirty = false;
1027
1028         if (limit != LFSCK_SPEED_NO_LIMIT) {
1029                 if (limit > HZ) {
1030                         lfsck->li_sleep_rate = limit / HZ;
1031                         lfsck->li_sleep_jif = 1;
1032                 } else {
1033                         lfsck->li_sleep_rate = 1;
1034                         lfsck->li_sleep_jif = HZ / limit;
1035                 }
1036         } else {
1037                 lfsck->li_sleep_jif = 0;
1038                 lfsck->li_sleep_rate = 0;
1039         }
1040
1041         if (lfsck->li_bookmark_ram.lb_speed_limit != limit) {
1042                 lfsck->li_bookmark_ram.lb_speed_limit = limit;
1043                 dirty = true;
1044         }
1045
1046         return dirty;
1047 }
1048
1049 void lfsck_control_speed(struct lfsck_instance *lfsck)
1050 {
1051         struct ptlrpc_thread *thread = &lfsck->li_thread;
1052         struct l_wait_info    lwi;
1053
1054         if (lfsck->li_sleep_jif > 0 &&
1055             lfsck->li_new_scanned >= lfsck->li_sleep_rate) {
1056                 lwi = LWI_TIMEOUT_INTR(lfsck->li_sleep_jif, NULL,
1057                                        LWI_ON_SIGNAL_NOOP, NULL);
1058
1059                 l_wait_event(thread->t_ctl_waitq,
1060                              !thread_is_running(thread),
1061                              &lwi);
1062                 lfsck->li_new_scanned = 0;
1063         }
1064 }
1065
1066 void lfsck_control_speed_by_self(struct lfsck_component *com)
1067 {
1068         struct lfsck_instance   *lfsck  = com->lc_lfsck;
1069         struct ptlrpc_thread    *thread = &lfsck->li_thread;
1070         struct l_wait_info       lwi;
1071
1072         if (lfsck->li_sleep_jif > 0 &&
1073             com->lc_new_scanned >= lfsck->li_sleep_rate) {
1074                 lwi = LWI_TIMEOUT_INTR(lfsck->li_sleep_jif, NULL,
1075                                        LWI_ON_SIGNAL_NOOP, NULL);
1076
1077                 l_wait_event(thread->t_ctl_waitq,
1078                              !thread_is_running(thread),
1079                              &lwi);
1080                 com->lc_new_scanned = 0;
1081         }
1082 }
1083
1084 static int lfsck_parent_fid(const struct lu_env *env, struct dt_object *obj,
1085                             struct lu_fid *fid)
1086 {
1087         if (unlikely(!S_ISDIR(lfsck_object_type(obj)) ||
1088                      !dt_try_as_dir(env, obj)))
1089                 return -ENOTDIR;
1090
1091         return dt_lookup(env, obj, (struct dt_rec *)fid,
1092                          (const struct dt_key *)"..", BYPASS_CAPA);
1093 }
1094
1095 static int lfsck_needs_scan_dir(const struct lu_env *env,
1096                                 struct lfsck_instance *lfsck,
1097                                 struct dt_object *obj)
1098 {
1099         struct lu_fid *fid   = &lfsck_env_info(env)->lti_fid;
1100         int            depth = 0;
1101         int            rc;
1102
1103         if (!lfsck->li_master || !S_ISDIR(lfsck_object_type(obj)) ||
1104             cfs_list_empty(&lfsck->li_list_dir))
1105                RETURN(0);
1106
1107         while (1) {
1108                 /* XXX: Currently, we do not scan the "/REMOTE_PARENT_DIR",
1109                  *      which is the agent directory to manage the objects
1110                  *      which name entries reside on remote MDTs. Related
1111                  *      consistency verification will be processed in LFSCK
1112                  *      phase III. */
1113                 if (lu_fid_eq(lfsck_dto2fid(obj), &lfsck->li_global_root_fid)) {
1114                         if (depth > 0)
1115                                 lfsck_object_put(env, obj);
1116                         return 1;
1117                 }
1118
1119                 /* No need to check .lustre and its children. */
1120                 if (fid_seq_is_dot_lustre(fid_seq(lfsck_dto2fid(obj)))) {
1121                         if (depth > 0)
1122                                 lfsck_object_put(env, obj);
1123                         return 0;
1124                 }
1125
1126                 dt_read_lock(env, obj, MOR_TGT_CHILD);
1127                 if (unlikely(lfsck_is_dead_obj(obj))) {
1128                         dt_read_unlock(env, obj);
1129                         if (depth > 0)
1130                                 lfsck_object_put(env, obj);
1131                         return 0;
1132                 }
1133
1134                 rc = dt_xattr_get(env, obj,
1135                                   lfsck_buf_get(env, NULL, 0), XATTR_NAME_LINK,
1136                                   BYPASS_CAPA);
1137                 dt_read_unlock(env, obj);
1138                 if (rc >= 0) {
1139                         if (depth > 0)
1140                                 lfsck_object_put(env, obj);
1141                         return 1;
1142                 }
1143
1144                 if (rc < 0 && rc != -ENODATA) {
1145                         if (depth > 0)
1146                                 lfsck_object_put(env, obj);
1147                         return rc;
1148                 }
1149
1150                 rc = lfsck_parent_fid(env, obj, fid);
1151                 if (depth > 0)
1152                         lfsck_object_put(env, obj);
1153                 if (rc != 0)
1154                         return rc;
1155
1156                 if (unlikely(lu_fid_eq(fid, &lfsck->li_local_root_fid)))
1157                         return 0;
1158
1159                 obj = lfsck_object_find(env, lfsck, fid);
1160                 if (obj == NULL)
1161                         return 0;
1162                 else if (IS_ERR(obj))
1163                         return PTR_ERR(obj);
1164
1165                 if (!dt_object_exists(obj)) {
1166                         lfsck_object_put(env, obj);
1167                         return 0;
1168                 }
1169
1170                 if (dt_object_remote(obj)) {
1171                         /* .lustre/lost+found/MDTxxx can be remote directory. */
1172                         if (fid_seq_is_dot_lustre(fid_seq(lfsck_dto2fid(obj))))
1173                                 rc = 0;
1174                         else
1175                                 /* Other remote directory should be client
1176                                  * visible and need to be checked. */
1177                                 rc = 1;
1178                         lfsck_object_put(env, obj);
1179                         return rc;
1180                 }
1181
1182                 depth++;
1183         }
1184         return 0;
1185 }
1186
1187 struct lfsck_thread_args *lfsck_thread_args_init(struct lfsck_instance *lfsck,
1188                                                  struct lfsck_component *com,
1189                                                  struct lfsck_start_param *lsp)
1190 {
1191         struct lfsck_thread_args *lta;
1192         int                       rc;
1193
1194         OBD_ALLOC_PTR(lta);
1195         if (lta == NULL)
1196                 return ERR_PTR(-ENOMEM);
1197
1198         rc = lu_env_init(&lta->lta_env, LCT_MD_THREAD | LCT_DT_THREAD);
1199         if (rc != 0) {
1200                 OBD_FREE_PTR(lta);
1201                 return ERR_PTR(rc);
1202         }
1203
1204         lta->lta_lfsck = lfsck_instance_get(lfsck);
1205         if (com != NULL)
1206                 lta->lta_com = lfsck_component_get(com);
1207
1208         lta->lta_lsp = lsp;
1209
1210         return lta;
1211 }
1212
1213 void lfsck_thread_args_fini(struct lfsck_thread_args *lta)
1214 {
1215         if (lta->lta_com != NULL)
1216                 lfsck_component_put(&lta->lta_env, lta->lta_com);
1217         lfsck_instance_put(&lta->lta_env, lta->lta_lfsck);
1218         lu_env_fini(&lta->lta_env);
1219         OBD_FREE_PTR(lta);
1220 }
1221
1222 /* LFSCK wrap functions */
1223
1224 void lfsck_fail(const struct lu_env *env, struct lfsck_instance *lfsck,
1225                 bool new_checked)
1226 {
1227         struct lfsck_component *com;
1228
1229         cfs_list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
1230                 com->lc_ops->lfsck_fail(env, com, new_checked);
1231         }
1232 }
1233
1234 int lfsck_checkpoint(const struct lu_env *env, struct lfsck_instance *lfsck)
1235 {
1236         struct lfsck_component *com;
1237         int                     rc  = 0;
1238         int                     rc1 = 0;
1239
1240         if (likely(cfs_time_beforeq(cfs_time_current(),
1241                                     lfsck->li_time_next_checkpoint)))
1242                 return 0;
1243
1244         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_current, false);
1245         cfs_list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
1246                 rc = com->lc_ops->lfsck_checkpoint(env, com, false);
1247                 if (rc != 0)
1248                         rc1 = rc;
1249         }
1250
1251         lfsck->li_time_last_checkpoint = cfs_time_current();
1252         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
1253                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
1254         return rc1 != 0 ? rc1 : rc;
1255 }
1256
1257 int lfsck_prep(const struct lu_env *env, struct lfsck_instance *lfsck,
1258                struct lfsck_start_param *lsp)
1259 {
1260         struct dt_object       *obj     = NULL;
1261         struct lfsck_component *com;
1262         struct lfsck_component *next;
1263         struct lfsck_position  *pos     = NULL;
1264         const struct dt_it_ops *iops    =
1265                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
1266         struct dt_it           *di;
1267         int                     rc;
1268         ENTRY;
1269
1270         LASSERT(lfsck->li_obj_dir == NULL);
1271         LASSERT(lfsck->li_di_dir == NULL);
1272
1273         lfsck->li_current_oit_processed = 0;
1274         cfs_list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
1275                 com->lc_new_checked = 0;
1276                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1277                         com->lc_journal = 0;
1278
1279                 rc = com->lc_ops->lfsck_prep(env, com, lsp);
1280                 if (rc != 0)
1281                         GOTO(out, rc);
1282
1283                 if ((pos == NULL) ||
1284                     (!lfsck_pos_is_zero(&com->lc_pos_start) &&
1285                      lfsck_pos_is_eq(pos, &com->lc_pos_start) > 0))
1286                         pos = &com->lc_pos_start;
1287         }
1288
1289         /* Init otable-based iterator. */
1290         if (pos == NULL) {
1291                 rc = iops->load(env, lfsck->li_di_oit, 0);
1292                 if (rc > 0) {
1293                         lfsck->li_oit_over = 1;
1294                         rc = 0;
1295                 }
1296
1297                 GOTO(out, rc);
1298         }
1299
1300         rc = iops->load(env, lfsck->li_di_oit, pos->lp_oit_cookie);
1301         if (rc < 0)
1302                 GOTO(out, rc);
1303         else if (rc > 0)
1304                 lfsck->li_oit_over = 1;
1305
1306         if (!lfsck->li_master || fid_is_zero(&pos->lp_dir_parent))
1307                 GOTO(out, rc = 0);
1308
1309         /* Find the directory for namespace-based traverse. */
1310         obj = lfsck_object_find(env, lfsck, &pos->lp_dir_parent);
1311         if (obj == NULL)
1312                 GOTO(out, rc = 0);
1313         else if (IS_ERR(obj))
1314                 RETURN(PTR_ERR(obj));
1315
1316         /* XXX: Currently, skip remote object, the consistency for
1317          *      remote object will be processed in LFSCK phase III. */
1318         if (!dt_object_exists(obj) || dt_object_remote(obj) ||
1319             unlikely(!S_ISDIR(lfsck_object_type(obj))))
1320                 GOTO(out, rc = 0);
1321
1322         if (unlikely(!dt_try_as_dir(env, obj)))
1323                 GOTO(out, rc = -ENOTDIR);
1324
1325         /* Init the namespace-based directory traverse. */
1326         iops = &obj->do_index_ops->dio_it;
1327         di = iops->init(env, obj, lfsck->li_args_dir, BYPASS_CAPA);
1328         if (IS_ERR(di))
1329                 GOTO(out, rc = PTR_ERR(di));
1330
1331         LASSERT(pos->lp_dir_cookie < MDS_DIR_END_OFF);
1332
1333         rc = iops->load(env, di, pos->lp_dir_cookie);
1334         if ((rc == 0) || (rc > 0 && pos->lp_dir_cookie > 0))
1335                 rc = iops->next(env, di);
1336         else if (rc > 0)
1337                 rc = 0;
1338
1339         if (rc != 0) {
1340                 iops->put(env, di);
1341                 iops->fini(env, di);
1342                 GOTO(out, rc);
1343         }
1344
1345         lfsck->li_obj_dir = lfsck_object_get(obj);
1346         lfsck->li_cookie_dir = iops->store(env, di);
1347         spin_lock(&lfsck->li_lock);
1348         lfsck->li_di_dir = di;
1349         spin_unlock(&lfsck->li_lock);
1350
1351         GOTO(out, rc = 0);
1352
1353 out:
1354         if (obj != NULL)
1355                 lfsck_object_put(env, obj);
1356
1357         if (rc < 0) {
1358                 cfs_list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
1359                                              lc_link)
1360                         com->lc_ops->lfsck_post(env, com, rc, true);
1361
1362                 return rc;
1363         }
1364
1365         rc = 0;
1366         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_current, true);
1367         cfs_list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
1368                 rc = com->lc_ops->lfsck_checkpoint(env, com, true);
1369                 if (rc != 0)
1370                         break;
1371         }
1372
1373         lfsck->li_time_last_checkpoint = cfs_time_current();
1374         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
1375                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
1376         return rc;
1377 }
1378
1379 int lfsck_exec_oit(const struct lu_env *env, struct lfsck_instance *lfsck,
1380                    struct dt_object *obj)
1381 {
1382         struct lfsck_component *com;
1383         const struct dt_it_ops *iops;
1384         struct dt_it           *di;
1385         int                     rc;
1386         ENTRY;
1387
1388         LASSERT(lfsck->li_obj_dir == NULL);
1389
1390         cfs_list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
1391                 rc = com->lc_ops->lfsck_exec_oit(env, com, obj);
1392                 if (rc != 0)
1393                         RETURN(rc);
1394         }
1395
1396         rc = lfsck_needs_scan_dir(env, lfsck, obj);
1397         if (rc <= 0)
1398                 GOTO(out, rc);
1399
1400         if (unlikely(!dt_try_as_dir(env, obj)))
1401                 GOTO(out, rc = -ENOTDIR);
1402
1403         iops = &obj->do_index_ops->dio_it;
1404         di = iops->init(env, obj, lfsck->li_args_dir, BYPASS_CAPA);
1405         if (IS_ERR(di))
1406                 GOTO(out, rc = PTR_ERR(di));
1407
1408         rc = iops->load(env, di, 0);
1409         if (rc == 0)
1410                 rc = iops->next(env, di);
1411         else if (rc > 0)
1412                 rc = 0;
1413
1414         if (rc != 0) {
1415                 iops->put(env, di);
1416                 iops->fini(env, di);
1417                 GOTO(out, rc);
1418         }
1419
1420         lfsck->li_obj_dir = lfsck_object_get(obj);
1421         lfsck->li_cookie_dir = iops->store(env, di);
1422         spin_lock(&lfsck->li_lock);
1423         lfsck->li_di_dir = di;
1424         spin_unlock(&lfsck->li_lock);
1425
1426         GOTO(out, rc = 0);
1427
1428 out:
1429         if (rc < 0)
1430                 lfsck_fail(env, lfsck, false);
1431         return (rc > 0 ? 0 : rc);
1432 }
1433
1434 int lfsck_exec_dir(const struct lu_env *env, struct lfsck_instance *lfsck,
1435                    struct dt_object *obj, struct lu_dirent *ent)
1436 {
1437         struct lfsck_component *com;
1438         int                     rc;
1439
1440         cfs_list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
1441                 rc = com->lc_ops->lfsck_exec_dir(env, com, obj, ent);
1442                 if (rc != 0)
1443                         return rc;
1444         }
1445         return 0;
1446 }
1447
1448 int lfsck_post(const struct lu_env *env, struct lfsck_instance *lfsck,
1449                int result)
1450 {
1451         struct lfsck_component *com;
1452         struct lfsck_component *next;
1453         int                     rc  = 0;
1454         int                     rc1 = 0;
1455
1456         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_current, false);
1457         cfs_list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
1458                 rc = com->lc_ops->lfsck_post(env, com, result, false);
1459                 if (rc != 0)
1460                         rc1 = rc;
1461         }
1462
1463         lfsck->li_time_last_checkpoint = cfs_time_current();
1464         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
1465                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
1466
1467         /* Ignore some component post failure to make other can go ahead. */
1468         return result;
1469 }
1470
1471 static void lfsck_interpret(const struct lu_env *env,
1472                             struct lfsck_instance *lfsck,
1473                             struct ptlrpc_request *req, void *args, int result)
1474 {
1475         struct lfsck_async_interpret_args *laia = args;
1476         struct lfsck_component            *com;
1477
1478         LASSERT(laia->laia_com == NULL);
1479         LASSERT(laia->laia_shared);
1480
1481         spin_lock(&lfsck->li_lock);
1482         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
1483                 if (com->lc_ops->lfsck_interpret != NULL) {
1484                         laia->laia_com = com;
1485                         com->lc_ops->lfsck_interpret(env, req, laia, result);
1486                 }
1487         }
1488
1489         list_for_each_entry(com, &lfsck->li_list_double_scan, lc_link) {
1490                 if (com->lc_ops->lfsck_interpret != NULL) {
1491                         laia->laia_com = com;
1492                         com->lc_ops->lfsck_interpret(env, req, laia, result);
1493                 }
1494         }
1495         spin_unlock(&lfsck->li_lock);
1496 }
1497
1498 int lfsck_double_scan(const struct lu_env *env, struct lfsck_instance *lfsck)
1499 {
1500         struct lfsck_component *com;
1501         struct lfsck_component *next;
1502         struct l_wait_info      lwi = { 0 };
1503         int                     rc  = 0;
1504         int                     rc1 = 0;
1505
1506         list_for_each_entry(com, &lfsck->li_list_double_scan, lc_link) {
1507                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1508                         com->lc_journal = 0;
1509
1510                 rc = com->lc_ops->lfsck_double_scan(env, com);
1511                 if (rc != 0)
1512                         rc1 = rc;
1513         }
1514
1515         l_wait_event(lfsck->li_thread.t_ctl_waitq,
1516                      atomic_read(&lfsck->li_double_scan_count) == 0,
1517                      &lwi);
1518
1519         if (lfsck->li_status != LS_PAUSED &&
1520             lfsck->li_status != LS_CO_PAUSED) {
1521                 list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
1522                                          lc_link) {
1523                         spin_lock(&lfsck->li_lock);
1524                         list_del_init(&com->lc_link);
1525                         list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1526                         spin_unlock(&lfsck->li_lock);
1527                 }
1528         }
1529
1530         return rc1 != 0 ? rc1 : rc;
1531 }
1532
1533 static int lfsck_stop_notify(const struct lu_env *env,
1534                              struct lfsck_instance *lfsck,
1535                              struct lfsck_tgt_descs *ltds,
1536                              struct lfsck_tgt_desc *ltd, __u16 type)
1537 {
1538         struct ptlrpc_request_set *set;
1539         struct lfsck_component    *com;
1540         int                        rc  = 0;
1541         ENTRY;
1542
1543         spin_lock(&lfsck->li_lock);
1544         com = __lfsck_component_find(lfsck, type, &lfsck->li_list_scan);
1545         if (com == NULL)
1546                 com = __lfsck_component_find(lfsck, type,
1547                                              &lfsck->li_list_double_scan);
1548         if (com != NULL)
1549                 lfsck_component_get(com);
1550         spin_lock(&lfsck->li_lock);
1551
1552         if (com != NULL) {
1553                 if (com->lc_ops->lfsck_stop_notify != NULL) {
1554                         set = ptlrpc_prep_set();
1555                         if (set == NULL) {
1556                                 lfsck_component_put(env, com);
1557
1558                                 RETURN(-ENOMEM);
1559                         }
1560
1561                         rc = com->lc_ops->lfsck_stop_notify(env, com, ltds,
1562                                                             ltd, set);
1563                         if (rc == 0)
1564                                 rc = ptlrpc_set_wait(set);
1565
1566                         ptlrpc_set_destroy(set);
1567                 }
1568
1569                 lfsck_component_put(env, com);
1570         }
1571
1572         RETURN(rc);
1573 }
1574
1575 void lfsck_quit(const struct lu_env *env, struct lfsck_instance *lfsck)
1576 {
1577         struct lfsck_component *com;
1578         struct lfsck_component *next;
1579
1580         list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
1581                                  lc_link) {
1582                 if (com->lc_ops->lfsck_quit != NULL)
1583                         com->lc_ops->lfsck_quit(env, com);
1584
1585                 spin_lock(&lfsck->li_lock);
1586                 list_del_init(&com->lc_link);
1587                 list_del_init(&com->lc_link_dir);
1588                 list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1589                 spin_unlock(&lfsck->li_lock);
1590         }
1591
1592         list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
1593                                  lc_link) {
1594                 if (com->lc_ops->lfsck_quit != NULL)
1595                         com->lc_ops->lfsck_quit(env, com);
1596
1597                 spin_lock(&lfsck->li_lock);
1598                 list_del_init(&com->lc_link);
1599                 list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1600                 spin_unlock(&lfsck->li_lock);
1601         }
1602 }
1603
1604 static int lfsck_async_interpret(const struct lu_env *env,
1605                                  struct ptlrpc_request *req,
1606                                  void *args, int rc)
1607 {
1608         struct lfsck_async_interpret_args *laia = args;
1609         struct lfsck_instance             *lfsck;
1610
1611         lfsck = container_of0(laia->laia_ltds, struct lfsck_instance,
1612                               li_mdt_descs);
1613         lfsck_interpret(env, lfsck, req, laia, rc);
1614         lfsck_tgt_put(laia->laia_ltd);
1615         if (rc != 0 && laia->laia_result != -EALREADY)
1616                 laia->laia_result = rc;
1617
1618         return 0;
1619 }
1620
1621 int lfsck_async_request(const struct lu_env *env, struct obd_export *exp,
1622                         struct lfsck_request *lr,
1623                         struct ptlrpc_request_set *set,
1624                         ptlrpc_interpterer_t interpreter,
1625                         void *args, int request)
1626 {
1627         struct lfsck_async_interpret_args *laia;
1628         struct ptlrpc_request             *req;
1629         struct lfsck_request              *tmp;
1630         struct req_format                 *format;
1631         int                                rc;
1632
1633         switch (request) {
1634         case LFSCK_NOTIFY:
1635                 format = &RQF_LFSCK_NOTIFY;
1636                 break;
1637         case LFSCK_QUERY:
1638                 format = &RQF_LFSCK_QUERY;
1639                 break;
1640         default:
1641                 CERROR("%s: unknown async request: opc = %d\n",
1642                        exp->exp_obd->obd_name, request);
1643                 return -EINVAL;
1644         }
1645
1646         req = ptlrpc_request_alloc(class_exp2cliimp(exp), format);
1647         if (req == NULL)
1648                 return -ENOMEM;
1649
1650         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, request);
1651         if (rc != 0) {
1652                 ptlrpc_request_free(req);
1653
1654                 return rc;
1655         }
1656
1657         tmp = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
1658         *tmp = *lr;
1659         ptlrpc_request_set_replen(req);
1660
1661         laia = ptlrpc_req_async_args(req);
1662         *laia = *(struct lfsck_async_interpret_args *)args;
1663         if (laia->laia_com != NULL)
1664                 lfsck_component_get(laia->laia_com);
1665         req->rq_interpret_reply = interpreter;
1666         ptlrpc_set_add_req(set, req);
1667
1668         return 0;
1669 }
1670
1671 /* external interfaces */
1672
1673 int lfsck_get_speed(struct dt_device *key, void *buf, int len)
1674 {
1675         struct lu_env           env;
1676         struct lfsck_instance  *lfsck;
1677         int                     rc;
1678         ENTRY;
1679
1680         rc = lu_env_init(&env, LCT_MD_THREAD | LCT_DT_THREAD);
1681         if (rc != 0)
1682                 RETURN(rc);
1683
1684         lfsck = lfsck_instance_find(key, true, false);
1685         if (likely(lfsck != NULL)) {
1686                 rc = snprintf(buf, len, "%u\n",
1687                               lfsck->li_bookmark_ram.lb_speed_limit);
1688                 lfsck_instance_put(&env, lfsck);
1689         } else {
1690                 rc = -ENXIO;
1691         }
1692
1693         lu_env_fini(&env);
1694
1695         RETURN(rc);
1696 }
1697 EXPORT_SYMBOL(lfsck_get_speed);
1698
1699 int lfsck_set_speed(struct dt_device *key, int val)
1700 {
1701         struct lu_env           env;
1702         struct lfsck_instance  *lfsck;
1703         int                     rc;
1704         ENTRY;
1705
1706         rc = lu_env_init(&env, LCT_MD_THREAD | LCT_DT_THREAD);
1707         if (rc != 0)
1708                 RETURN(rc);
1709
1710         lfsck = lfsck_instance_find(key, true, false);
1711         if (likely(lfsck != NULL)) {
1712                 mutex_lock(&lfsck->li_mutex);
1713                 if (__lfsck_set_speed(lfsck, val))
1714                         rc = lfsck_bookmark_store(&env, lfsck);
1715                 mutex_unlock(&lfsck->li_mutex);
1716                 lfsck_instance_put(&env, lfsck);
1717         } else {
1718                 rc = -ENXIO;
1719         }
1720
1721         lu_env_fini(&env);
1722
1723         RETURN(rc);
1724 }
1725 EXPORT_SYMBOL(lfsck_set_speed);
1726
1727 int lfsck_get_windows(struct dt_device *key, void *buf, int len)
1728 {
1729         struct lu_env           env;
1730         struct lfsck_instance  *lfsck;
1731         int                     rc;
1732         ENTRY;
1733
1734         rc = lu_env_init(&env, LCT_MD_THREAD | LCT_DT_THREAD);
1735         if (rc != 0)
1736                 RETURN(rc);
1737
1738         lfsck = lfsck_instance_find(key, true, false);
1739         if (likely(lfsck != NULL)) {
1740                 rc = snprintf(buf, len, "%u\n",
1741                               lfsck->li_bookmark_ram.lb_async_windows);
1742                 lfsck_instance_put(&env, lfsck);
1743         } else {
1744                 rc = -ENXIO;
1745         }
1746
1747         lu_env_fini(&env);
1748
1749         RETURN(rc);
1750 }
1751 EXPORT_SYMBOL(lfsck_get_windows);
1752
1753 int lfsck_set_windows(struct dt_device *key, int val)
1754 {
1755         struct lu_env           env;
1756         struct lfsck_instance  *lfsck;
1757         int                     rc;
1758         ENTRY;
1759
1760         rc = lu_env_init(&env, LCT_MD_THREAD | LCT_DT_THREAD);
1761         if (rc != 0)
1762                 RETURN(rc);
1763
1764         lfsck = lfsck_instance_find(key, true, false);
1765         if (likely(lfsck != NULL)) {
1766                 if (val > LFSCK_ASYNC_WIN_MAX) {
1767                         CWARN("%s: Too large async window size, which "
1768                               "may cause memory issues. The valid range "
1769                               "is [0 - %u]. If you do not want to restrict "
1770                               "the window size for async requests pipeline, "
1771                               "just set it as 0.\n",
1772                               lfsck_lfsck2name(lfsck), LFSCK_ASYNC_WIN_MAX);
1773                         rc = -EINVAL;
1774                 } else if (lfsck->li_bookmark_ram.lb_async_windows != val) {
1775                         mutex_lock(&lfsck->li_mutex);
1776                         lfsck->li_bookmark_ram.lb_async_windows = val;
1777                         rc = lfsck_bookmark_store(&env, lfsck);
1778                         mutex_unlock(&lfsck->li_mutex);
1779                 }
1780                 lfsck_instance_put(&env, lfsck);
1781         } else {
1782                 rc = -ENXIO;
1783         }
1784
1785         lu_env_fini(&env);
1786
1787         RETURN(rc);
1788 }
1789 EXPORT_SYMBOL(lfsck_set_windows);
1790
1791 int lfsck_dump(struct dt_device *key, void *buf, int len, enum lfsck_type type)
1792 {
1793         struct lu_env           env;
1794         struct lfsck_instance  *lfsck;
1795         struct lfsck_component *com;
1796         int                     rc;
1797         ENTRY;
1798
1799         rc = lu_env_init(&env, LCT_MD_THREAD | LCT_DT_THREAD);
1800         if (rc != 0)
1801                 RETURN(rc);
1802
1803         lfsck = lfsck_instance_find(key, true, false);
1804         if (likely(lfsck != NULL)) {
1805                 com = lfsck_component_find(lfsck, type);
1806                 if (likely(com != NULL)) {
1807                         rc = com->lc_ops->lfsck_dump(&env, com, buf, len);
1808                         lfsck_component_put(&env, com);
1809                 } else {
1810                         rc = -ENOTSUPP;
1811                 }
1812
1813                 lfsck_instance_put(&env, lfsck);
1814         } else {
1815                 rc = -ENXIO;
1816         }
1817
1818         lu_env_fini(&env);
1819
1820         RETURN(rc);
1821 }
1822 EXPORT_SYMBOL(lfsck_dump);
1823
1824 static int lfsck_stop_all(const struct lu_env *env,
1825                           struct lfsck_instance *lfsck,
1826                           struct lfsck_stop *stop)
1827 {
1828         struct lfsck_thread_info          *info   = lfsck_env_info(env);
1829         struct lfsck_request              *lr     = &info->lti_lr;
1830         struct lfsck_async_interpret_args *laia   = &info->lti_laia;
1831         struct ptlrpc_request_set         *set;
1832         struct lfsck_tgt_descs            *ltds   = &lfsck->li_mdt_descs;
1833         struct lfsck_tgt_desc             *ltd;
1834         struct lfsck_bookmark             *bk     = &lfsck->li_bookmark_ram;
1835         __u32                              idx;
1836         int                                rc     = 0;
1837         int                                rc1    = 0;
1838         ENTRY;
1839
1840         LASSERT(stop->ls_flags & LPF_BROADCAST);
1841
1842         set = ptlrpc_prep_set();
1843         if (unlikely(set == NULL)) {
1844                 CERROR("%s: cannot allocate memory for stop LFSCK on "
1845                        "all targets\n", lfsck_lfsck2name(lfsck));
1846
1847                 RETURN(-ENOMEM);
1848         }
1849
1850         memset(lr, 0, sizeof(*lr));
1851         lr->lr_event = LE_STOP;
1852         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
1853         lr->lr_status = stop->ls_status;
1854         lr->lr_version = bk->lb_version;
1855         lr->lr_active = LFSCK_TYPES_ALL;
1856         lr->lr_param = stop->ls_flags;
1857
1858         laia->laia_com = NULL;
1859         laia->laia_ltds = ltds;
1860         laia->laia_lr = lr;
1861         laia->laia_result = 0;
1862         laia->laia_shared = 1;
1863
1864         down_read(&ltds->ltd_rw_sem);
1865         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1866                 ltd = lfsck_tgt_get(ltds, idx);
1867                 LASSERT(ltd != NULL);
1868
1869                 laia->laia_ltd = ltd;
1870                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1871                                          lfsck_async_interpret, laia,
1872                                          LFSCK_NOTIFY);
1873                 if (rc != 0) {
1874                         lfsck_interpret(env, lfsck, NULL, laia, rc);
1875                         lfsck_tgt_put(ltd);
1876                         CWARN("%s: cannot notify MDT %x for LFSCK stop: "
1877                               "rc = %d\n", lfsck_lfsck2name(lfsck), idx, rc);
1878                         rc1 = rc;
1879                 }
1880         }
1881         up_read(&ltds->ltd_rw_sem);
1882
1883         rc = ptlrpc_set_wait(set);
1884         ptlrpc_set_destroy(set);
1885
1886         if (rc == 0)
1887                 rc = laia->laia_result;
1888
1889         if (rc == -EALREADY)
1890                 rc = 0;
1891
1892         if (rc != 0)
1893                 CWARN("%s: fail to stop LFSCK on some MDTs: rc = %d\n",
1894                       lfsck_lfsck2name(lfsck), rc);
1895
1896         RETURN(rc != 0 ? rc : rc1);
1897 }
1898
1899 static int lfsck_start_all(const struct lu_env *env,
1900                            struct lfsck_instance *lfsck,
1901                            struct lfsck_start *start)
1902 {
1903         struct lfsck_thread_info          *info   = lfsck_env_info(env);
1904         struct lfsck_request              *lr     = &info->lti_lr;
1905         struct lfsck_async_interpret_args *laia   = &info->lti_laia;
1906         struct ptlrpc_request_set         *set;
1907         struct lfsck_tgt_descs            *ltds   = &lfsck->li_mdt_descs;
1908         struct lfsck_tgt_desc             *ltd;
1909         struct lfsck_bookmark             *bk     = &lfsck->li_bookmark_ram;
1910         __u32                              idx;
1911         int                                rc     = 0;
1912         ENTRY;
1913
1914         LASSERT(start->ls_flags & LPF_BROADCAST);
1915
1916         set = ptlrpc_prep_set();
1917         if (unlikely(set == NULL)) {
1918                 if (bk->lb_param & LPF_FAILOUT) {
1919                         CERROR("%s: cannot allocate memory for start LFSCK on "
1920                                "all targets, failout.\n",
1921                                lfsck_lfsck2name(lfsck));
1922
1923                         RETURN(-ENOMEM);
1924                 } else {
1925                         CWARN("%s: cannot allocate memory for start LFSCK on "
1926                               "all targets, partly scan.\n",
1927                               lfsck_lfsck2name(lfsck));
1928
1929                         RETURN(0);
1930                 }
1931         }
1932
1933         memset(lr, 0, sizeof(*lr));
1934         lr->lr_event = LE_START;
1935         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
1936         lr->lr_speed = bk->lb_speed_limit;
1937         lr->lr_version = bk->lb_version;
1938         lr->lr_active = start->ls_active;
1939         lr->lr_param = start->ls_flags;
1940         lr->lr_async_windows = bk->lb_async_windows;
1941         lr->lr_valid = LSV_SPEED_LIMIT | LSV_ERROR_HANDLE | LSV_DRYRUN |
1942                        LSV_ASYNC_WINDOWS;
1943
1944         laia->laia_com = NULL;
1945         laia->laia_ltds = ltds;
1946         laia->laia_lr = lr;
1947         laia->laia_result = 0;
1948         laia->laia_shared = 1;
1949
1950         down_read(&ltds->ltd_rw_sem);
1951         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1952                 ltd = lfsck_tgt_get(ltds, idx);
1953                 LASSERT(ltd != NULL);
1954
1955                 laia->laia_ltd = ltd;
1956                 ltd->ltd_layout_done = 0;
1957                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1958                                          lfsck_async_interpret, laia,
1959                                          LFSCK_NOTIFY);
1960                 if (rc != 0) {
1961                         lfsck_interpret(env, lfsck, NULL, laia, rc);
1962                         lfsck_tgt_put(ltd);
1963                         if (bk->lb_param & LPF_FAILOUT) {
1964                                 CERROR("%s: cannot notify MDT %x for LFSCK "
1965                                        "start, failout: rc = %d\n",
1966                                        lfsck_lfsck2name(lfsck), idx, rc);
1967                                 break;
1968                         } else {
1969                                 CWARN("%s: cannot notify MDT %x for LFSCK "
1970                                       "start, partly scan: rc = %d\n",
1971                                       lfsck_lfsck2name(lfsck), idx, rc);
1972                                 rc = 0;
1973                         }
1974                 }
1975         }
1976         up_read(&ltds->ltd_rw_sem);
1977
1978         if (rc != 0) {
1979                 ptlrpc_set_destroy(set);
1980
1981                 RETURN(rc);
1982         }
1983
1984         rc = ptlrpc_set_wait(set);
1985         ptlrpc_set_destroy(set);
1986
1987         if (rc == 0)
1988                 rc = laia->laia_result;
1989
1990         if (rc != 0) {
1991                 if (bk->lb_param & LPF_FAILOUT) {
1992                         struct lfsck_stop *stop = &info->lti_stop;
1993
1994                         CERROR("%s: cannot start LFSCK on some MDTs, "
1995                                "stop all: rc = %d\n",
1996                                lfsck_lfsck2name(lfsck), rc);
1997                         if (rc != -EALREADY) {
1998                                 stop->ls_status = LS_FAILED;
1999                                 stop->ls_flags = LPF_ALL_TGT | LPF_BROADCAST;
2000                                 lfsck_stop_all(env, lfsck, stop);
2001                         }
2002                 } else {
2003                         CWARN("%s: cannot start LFSCK on some MDTs, "
2004                               "partly scan: rc = %d\n",
2005                               lfsck_lfsck2name(lfsck), rc);
2006                         rc = 0;
2007                 }
2008         }
2009
2010         RETURN(rc);
2011 }
2012
2013 int lfsck_start(const struct lu_env *env, struct dt_device *key,
2014                 struct lfsck_start_param *lsp)
2015 {
2016         struct lfsck_start              *start  = lsp->lsp_start;
2017         struct lfsck_instance           *lfsck;
2018         struct lfsck_bookmark           *bk;
2019         struct ptlrpc_thread            *thread;
2020         struct lfsck_component          *com;
2021         struct l_wait_info               lwi    = { 0 };
2022         struct lfsck_thread_args        *lta;
2023         struct task_struct              *task;
2024         int                              rc     = 0;
2025         __u16                            valid  = 0;
2026         __u16                            flags  = 0;
2027         __u16                            type   = 1;
2028         ENTRY;
2029
2030         lfsck = lfsck_instance_find(key, true, false);
2031         if (unlikely(lfsck == NULL))
2032                 RETURN(-ENXIO);
2033
2034         /* System is not ready, try again later. */
2035         if (unlikely(lfsck->li_namespace == NULL))
2036                 GOTO(put, rc = -EAGAIN);
2037
2038         /* start == NULL means auto trigger paused LFSCK. */
2039         if ((start == NULL) &&
2040             (cfs_list_empty(&lfsck->li_list_scan) ||
2041              OBD_FAIL_CHECK(OBD_FAIL_LFSCK_NO_AUTO)))
2042                 GOTO(put, rc = 0);
2043
2044         bk = &lfsck->li_bookmark_ram;
2045         thread = &lfsck->li_thread;
2046         mutex_lock(&lfsck->li_mutex);
2047         spin_lock(&lfsck->li_lock);
2048         if (!thread_is_init(thread) && !thread_is_stopped(thread)) {
2049                 rc = -EALREADY;
2050                 if (unlikely(start == NULL)) {
2051                         spin_unlock(&lfsck->li_lock);
2052                         GOTO(out, rc);
2053                 }
2054
2055                 while (start->ls_active != 0) {
2056                         if (!(type & start->ls_active)) {
2057                                 type <<= 1;
2058                                 continue;
2059                         }
2060
2061                         com = __lfsck_component_find(lfsck, type,
2062                                                      &lfsck->li_list_scan);
2063                         if (com == NULL)
2064                                 com = __lfsck_component_find(lfsck, type,
2065                                                 &lfsck->li_list_double_scan);
2066                         if (com == NULL) {
2067                                 rc = -EOPNOTSUPP;
2068                                 break;
2069                         }
2070
2071                         if (com->lc_ops->lfsck_join != NULL) {
2072                                 rc = com->lc_ops->lfsck_join( env, com, lsp);
2073                                 if (rc != 0 && rc != -EALREADY)
2074                                         break;
2075                         }
2076                         start->ls_active &= ~type;
2077                         type <<= 1;
2078                 }
2079                 spin_unlock(&lfsck->li_lock);
2080                 GOTO(out, rc);
2081         }
2082         spin_unlock(&lfsck->li_lock);
2083
2084         lfsck->li_status = 0;
2085         lfsck->li_oit_over = 0;
2086         lfsck->li_start_unplug = 0;
2087         lfsck->li_drop_dryrun = 0;
2088         lfsck->li_new_scanned = 0;
2089
2090         /* For auto trigger. */
2091         if (start == NULL)
2092                 goto trigger;
2093
2094         if (start->ls_flags & LPF_BROADCAST && !lfsck->li_master) {
2095                 CERROR("%s: only allow to specify '-A | -o' via MDS\n",
2096                        lfsck_lfsck2name(lfsck));
2097
2098                 GOTO(out, rc = -EPERM);
2099         }
2100
2101         start->ls_version = bk->lb_version;
2102
2103         if (start->ls_active != 0) {
2104                 struct lfsck_component *next;
2105
2106                 if (start->ls_active == LFSCK_TYPES_ALL)
2107                         start->ls_active = LFSCK_TYPES_SUPPORTED;
2108
2109                 if (start->ls_active & ~LFSCK_TYPES_SUPPORTED) {
2110                         start->ls_active &= ~LFSCK_TYPES_SUPPORTED;
2111                         GOTO(out, rc = -ENOTSUPP);
2112                 }
2113
2114                 list_for_each_entry_safe(com, next,
2115                                          &lfsck->li_list_scan, lc_link) {
2116                         if (!(com->lc_type & start->ls_active)) {
2117                                 rc = com->lc_ops->lfsck_post(env, com, 0,
2118                                                              false);
2119                                 if (rc != 0)
2120                                         GOTO(out, rc);
2121                         }
2122                 }
2123
2124                 while (start->ls_active != 0) {
2125                         if (type & start->ls_active) {
2126                                 com = __lfsck_component_find(lfsck, type,
2127                                                         &lfsck->li_list_idle);
2128                                 if (com != NULL) {
2129                                         /* The component status will be updated
2130                                          * when its prep() is called later by
2131                                          * the LFSCK main engine. */
2132                                         list_del_init(&com->lc_link);
2133                                         list_add_tail(&com->lc_link,
2134                                                       &lfsck->li_list_scan);
2135                                 }
2136                                 start->ls_active &= ~type;
2137                         }
2138                         type <<= 1;
2139                 }
2140         }
2141
2142         if (list_empty(&lfsck->li_list_scan)) {
2143                 /* The speed limit will be used to control both the LFSCK and
2144                  * low layer scrub (if applied), need to be handled firstly. */
2145                 if (start->ls_valid & LSV_SPEED_LIMIT) {
2146                         if (__lfsck_set_speed(lfsck, start->ls_speed_limit)) {
2147                                 rc = lfsck_bookmark_store(env, lfsck);
2148                                 if (rc != 0)
2149                                         GOTO(out, rc);
2150                         }
2151                 }
2152
2153                 goto trigger;
2154         }
2155
2156         if (start->ls_flags & LPF_RESET)
2157                 flags |= DOIF_RESET;
2158
2159         rc = lfsck_set_param(env, lfsck, start, !!(flags & DOIF_RESET));
2160         if (rc != 0)
2161                 GOTO(out, rc);
2162
2163         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
2164                 start->ls_active |= com->lc_type;
2165                 if (flags & DOIF_RESET) {
2166                         rc = com->lc_ops->lfsck_reset(env, com, false);
2167                         if (rc != 0)
2168                                 GOTO(out, rc);
2169                 }
2170         }
2171
2172 trigger:
2173         lfsck->li_args_dir = LUDA_64BITHASH | LUDA_VERIFY;
2174         if (bk->lb_param & LPF_DRYRUN)
2175                 lfsck->li_args_dir |= LUDA_VERIFY_DRYRUN;
2176
2177         if (start != NULL && start->ls_valid & LSV_ERROR_HANDLE) {
2178                 valid |= DOIV_ERROR_HANDLE;
2179                 if (start->ls_flags & LPF_FAILOUT)
2180                         flags |= DOIF_FAILOUT;
2181         }
2182
2183         if (start != NULL && start->ls_valid & LSV_DRYRUN) {
2184                 valid |= DOIV_DRYRUN;
2185                 if (start->ls_flags & LPF_DRYRUN)
2186                         flags |= DOIF_DRYRUN;
2187         }
2188
2189         if (!list_empty(&lfsck->li_list_scan))
2190                 flags |= DOIF_OUTUSED;
2191
2192         lfsck->li_args_oit = (flags << DT_OTABLE_IT_FLAGS_SHIFT) | valid;
2193         thread_set_flags(thread, 0);
2194         lta = lfsck_thread_args_init(lfsck, NULL, lsp);
2195         if (IS_ERR(lta))
2196                 GOTO(out, rc = PTR_ERR(lta));
2197
2198         __lfsck_set_speed(lfsck, bk->lb_speed_limit);
2199         task = kthread_run(lfsck_master_engine, lta, "lfsck");
2200         if (IS_ERR(task)) {
2201                 rc = PTR_ERR(task);
2202                 CERROR("%s: cannot start LFSCK thread: rc = %d\n",
2203                        lfsck_lfsck2name(lfsck), rc);
2204                 lfsck_thread_args_fini(lta);
2205
2206                 GOTO(out, rc);
2207         }
2208
2209         l_wait_event(thread->t_ctl_waitq,
2210                      thread_is_running(thread) ||
2211                      thread_is_stopped(thread),
2212                      &lwi);
2213         if (start == NULL || !(start->ls_flags & LPF_BROADCAST)) {
2214                 lfsck->li_start_unplug = 1;
2215                 wake_up_all(&thread->t_ctl_waitq);
2216
2217                 GOTO(out, rc = 0);
2218         }
2219
2220         /* release lfsck::li_mutex to avoid deadlock. */
2221         mutex_unlock(&lfsck->li_mutex);
2222         rc = lfsck_start_all(env, lfsck, start);
2223         if (rc != 0) {
2224                 spin_lock(&lfsck->li_lock);
2225                 if (thread_is_stopped(thread)) {
2226                         spin_unlock(&lfsck->li_lock);
2227                 } else {
2228                         lfsck->li_status = LS_FAILED;
2229                         lfsck->li_flags = 0;
2230                         thread_set_flags(thread, SVC_STOPPING);
2231                         spin_unlock(&lfsck->li_lock);
2232
2233                         lfsck->li_start_unplug = 1;
2234                         wake_up_all(&thread->t_ctl_waitq);
2235                         l_wait_event(thread->t_ctl_waitq,
2236                                      thread_is_stopped(thread),
2237                                      &lwi);
2238                 }
2239         } else {
2240                 lfsck->li_start_unplug = 1;
2241                 wake_up_all(&thread->t_ctl_waitq);
2242         }
2243
2244         GOTO(put, rc);
2245
2246 out:
2247         mutex_unlock(&lfsck->li_mutex);
2248
2249 put:
2250         lfsck_instance_put(env, lfsck);
2251
2252         return rc < 0 ? rc : 0;
2253 }
2254 EXPORT_SYMBOL(lfsck_start);
2255
2256 int lfsck_stop(const struct lu_env *env, struct dt_device *key,
2257                struct lfsck_stop *stop)
2258 {
2259         struct lfsck_instance   *lfsck;
2260         struct ptlrpc_thread    *thread;
2261         struct l_wait_info       lwi    = { 0 };
2262         int                      rc     = 0;
2263         int                      rc1    = 0;
2264         ENTRY;
2265
2266         lfsck = lfsck_instance_find(key, true, false);
2267         if (unlikely(lfsck == NULL))
2268                 RETURN(-ENXIO);
2269
2270         thread = &lfsck->li_thread;
2271         /* release lfsck::li_mutex to avoid deadlock. */
2272         if (stop != NULL && stop->ls_flags & LPF_BROADCAST) {
2273                 if (!lfsck->li_master) {
2274                         CERROR("%s: only allow to specify '-A' via MDS\n",
2275                                lfsck_lfsck2name(lfsck));
2276
2277                         GOTO(out, rc = -EPERM);
2278                 }
2279
2280                 rc1 = lfsck_stop_all(env, lfsck, stop);
2281         }
2282
2283         mutex_lock(&lfsck->li_mutex);
2284         spin_lock(&lfsck->li_lock);
2285         if (thread_is_init(thread) || thread_is_stopped(thread)) {
2286                 spin_unlock(&lfsck->li_lock);
2287                 GOTO(out, rc = -EALREADY);
2288         }
2289
2290         if (stop != NULL) {
2291                 lfsck->li_status = stop->ls_status;
2292                 lfsck->li_flags = stop->ls_flags;
2293         } else {
2294                 lfsck->li_status = LS_STOPPED;
2295                 lfsck->li_flags = 0;
2296         }
2297
2298         thread_set_flags(thread, SVC_STOPPING);
2299         spin_unlock(&lfsck->li_lock);
2300
2301         wake_up_all(&thread->t_ctl_waitq);
2302         l_wait_event(thread->t_ctl_waitq,
2303                      thread_is_stopped(thread),
2304                      &lwi);
2305
2306         GOTO(out, rc = 0);
2307
2308 out:
2309         mutex_unlock(&lfsck->li_mutex);
2310         lfsck_instance_put(env, lfsck);
2311
2312         return rc != 0 ? rc : rc1;
2313 }
2314 EXPORT_SYMBOL(lfsck_stop);
2315
2316 int lfsck_in_notify(const struct lu_env *env, struct dt_device *key,
2317                     struct lfsck_request *lr)
2318 {
2319         int rc = -EOPNOTSUPP;
2320         ENTRY;
2321
2322         switch (lr->lr_event) {
2323         case LE_START: {
2324                 struct lfsck_start       *start = &lfsck_env_info(env)->lti_start;
2325                 struct lfsck_start_param  lsp;
2326
2327                 memset(start, 0, sizeof(*start));
2328                 start->ls_valid = lr->lr_valid;
2329                 start->ls_speed_limit = lr->lr_speed;
2330                 start->ls_version = lr->lr_version;
2331                 start->ls_active = lr->lr_active;
2332                 start->ls_flags = lr->lr_param & ~LPF_BROADCAST;
2333                 start->ls_async_windows = lr->lr_async_windows;
2334
2335                 lsp.lsp_start = start;
2336                 lsp.lsp_index = lr->lr_index;
2337                 lsp.lsp_index_valid = 1;
2338                 rc = lfsck_start(env, key, &lsp);
2339                 break;
2340         }
2341         case LE_STOP: {
2342                 struct lfsck_stop *stop = &lfsck_env_info(env)->lti_stop;
2343
2344                 memset(stop, 0, sizeof(*stop));
2345                 stop->ls_status = lr->lr_status;
2346                 stop->ls_flags = lr->lr_param & ~LPF_BROADCAST;
2347                 rc = lfsck_stop(env, key, stop);
2348                 break;
2349         }
2350         case LE_PHASE1_DONE:
2351         case LE_PHASE2_DONE:
2352         case LE_FID_ACCESSED:
2353         case LE_PEER_EXIT:
2354         case LE_CONDITIONAL_DESTROY:
2355         case LE_PAIRS_VERIFY: {
2356                 struct lfsck_instance  *lfsck;
2357                 struct lfsck_component *com;
2358
2359                 lfsck = lfsck_instance_find(key, true, false);
2360                 if (unlikely(lfsck == NULL))
2361                         RETURN(-ENXIO);
2362
2363                 com = lfsck_component_find(lfsck, lr->lr_active);
2364                 if (likely(com != NULL)) {
2365                         rc = com->lc_ops->lfsck_in_notify(env, com, lr);
2366                         lfsck_component_put(env, com);
2367                 }
2368
2369                 lfsck_instance_put(env, lfsck);
2370                 break;
2371         }
2372         default:
2373                 break;
2374         }
2375
2376         RETURN(rc);
2377 }
2378 EXPORT_SYMBOL(lfsck_in_notify);
2379
2380 int lfsck_query(const struct lu_env *env, struct dt_device *key,
2381                 struct lfsck_request *lr)
2382 {
2383         struct lfsck_instance  *lfsck;
2384         struct lfsck_component *com;
2385         int                     rc;
2386         ENTRY;
2387
2388         lfsck = lfsck_instance_find(key, true, false);
2389         if (unlikely(lfsck == NULL))
2390                 RETURN(-ENXIO);
2391
2392         com = lfsck_component_find(lfsck, lr->lr_active);
2393         if (likely(com != NULL)) {
2394                 rc = com->lc_ops->lfsck_query(env, com);
2395                 lfsck_component_put(env, com);
2396         } else {
2397                 rc = -ENOTSUPP;
2398         }
2399
2400         lfsck_instance_put(env, lfsck);
2401
2402         RETURN(rc);
2403 }
2404 EXPORT_SYMBOL(lfsck_query);
2405
2406 int lfsck_register_namespace(const struct lu_env *env, struct dt_device *key,
2407                              struct ldlm_namespace *ns)
2408 {
2409         struct lfsck_instance  *lfsck;
2410         int                     rc      = -ENXIO;
2411
2412         lfsck = lfsck_instance_find(key, true, false);
2413         if (likely(lfsck != NULL)) {
2414                 lfsck->li_namespace = ns;
2415                 lfsck_instance_put(env, lfsck);
2416                 rc = 0;
2417         }
2418
2419         return rc;
2420 }
2421 EXPORT_SYMBOL(lfsck_register_namespace);
2422
2423 int lfsck_register(const struct lu_env *env, struct dt_device *key,
2424                    struct dt_device *next, struct obd_device *obd,
2425                    lfsck_out_notify notify, void *notify_data, bool master)
2426 {
2427         struct lfsck_instance   *lfsck;
2428         struct dt_object        *root  = NULL;
2429         struct dt_object        *obj;
2430         struct lu_fid           *fid   = &lfsck_env_info(env)->lti_fid;
2431         int                      rc;
2432         ENTRY;
2433
2434         lfsck = lfsck_instance_find(key, false, false);
2435         if (unlikely(lfsck != NULL))
2436                 RETURN(-EEXIST);
2437
2438         OBD_ALLOC_PTR(lfsck);
2439         if (lfsck == NULL)
2440                 RETURN(-ENOMEM);
2441
2442         mutex_init(&lfsck->li_mutex);
2443         spin_lock_init(&lfsck->li_lock);
2444         CFS_INIT_LIST_HEAD(&lfsck->li_link);
2445         CFS_INIT_LIST_HEAD(&lfsck->li_list_scan);
2446         CFS_INIT_LIST_HEAD(&lfsck->li_list_dir);
2447         CFS_INIT_LIST_HEAD(&lfsck->li_list_double_scan);
2448         CFS_INIT_LIST_HEAD(&lfsck->li_list_idle);
2449         atomic_set(&lfsck->li_ref, 1);
2450         atomic_set(&lfsck->li_double_scan_count, 0);
2451         init_waitqueue_head(&lfsck->li_thread.t_ctl_waitq);
2452         lfsck->li_out_notify = notify;
2453         lfsck->li_out_notify_data = notify_data;
2454         lfsck->li_next = next;
2455         lfsck->li_bottom = key;
2456         lfsck->li_obd = obd;
2457
2458         rc = lfsck_tgt_descs_init(&lfsck->li_ost_descs);
2459         if (rc != 0)
2460                 GOTO(out, rc);
2461
2462         rc = lfsck_tgt_descs_init(&lfsck->li_mdt_descs);
2463         if (rc != 0)
2464                 GOTO(out, rc);
2465
2466         fid->f_seq = FID_SEQ_LOCAL_NAME;
2467         fid->f_oid = 1;
2468         fid->f_ver = 0;
2469         rc = local_oid_storage_init(env, lfsck->li_bottom, fid, &lfsck->li_los);
2470         if (rc != 0)
2471                 GOTO(out, rc);
2472
2473         rc = dt_root_get(env, key, fid);
2474         if (rc != 0)
2475                 GOTO(out, rc);
2476
2477         root = dt_locate(env, lfsck->li_bottom, fid);
2478         if (IS_ERR(root))
2479                 GOTO(out, rc = PTR_ERR(root));
2480
2481         if (unlikely(!dt_try_as_dir(env, root)))
2482                 GOTO(out, rc = -ENOTDIR);
2483
2484         lfsck->li_local_root_fid = *fid;
2485         if (master) {
2486                 lfsck->li_master = 1;
2487                 if (lfsck_dev_idx(lfsck->li_bottom) == 0) {
2488                         rc = dt_lookup(env, root,
2489                                 (struct dt_rec *)(&lfsck->li_global_root_fid),
2490                                 (const struct dt_key *)"ROOT", BYPASS_CAPA);
2491                         if (rc != 0)
2492                                 GOTO(out, rc);
2493                 }
2494         }
2495
2496         fid->f_seq = FID_SEQ_LOCAL_FILE;
2497         fid->f_oid = OTABLE_IT_OID;
2498         fid->f_ver = 0;
2499         obj = dt_locate(env, lfsck->li_bottom, fid);
2500         if (IS_ERR(obj))
2501                 GOTO(out, rc = PTR_ERR(obj));
2502
2503         lfsck->li_obj_oit = obj;
2504         rc = obj->do_ops->do_index_try(env, obj, &dt_otable_features);
2505         if (rc != 0) {
2506                 if (rc == -ENOTSUPP)
2507                         GOTO(add, rc = 0);
2508
2509                 GOTO(out, rc);
2510         }
2511
2512         rc = lfsck_bookmark_setup(env, lfsck);
2513         if (rc != 0)
2514                 GOTO(out, rc);
2515
2516         if (master) {
2517                 rc = lfsck_fid_init(lfsck);
2518                 if (rc < 0)
2519                         GOTO(out, rc);
2520
2521                 rc = lfsck_namespace_setup(env, lfsck);
2522                 if (rc < 0)
2523                         GOTO(out, rc);
2524         }
2525
2526         rc = lfsck_layout_setup(env, lfsck);
2527         if (rc < 0)
2528                 GOTO(out, rc);
2529
2530         /* XXX: more LFSCK components initialization to be added here. */
2531
2532 add:
2533         rc = lfsck_instance_add(lfsck);
2534         if (rc == 0)
2535                 rc = lfsck_add_target_from_orphan(env, lfsck);
2536 out:
2537         if (root != NULL && !IS_ERR(root))
2538                 lu_object_put(env, &root->do_lu);
2539         if (rc != 0)
2540                 lfsck_instance_cleanup(env, lfsck);
2541         return rc;
2542 }
2543 EXPORT_SYMBOL(lfsck_register);
2544
2545 void lfsck_degister(const struct lu_env *env, struct dt_device *key)
2546 {
2547         struct lfsck_instance *lfsck;
2548
2549         lfsck = lfsck_instance_find(key, false, true);
2550         if (lfsck != NULL)
2551                 lfsck_instance_put(env, lfsck);
2552 }
2553 EXPORT_SYMBOL(lfsck_degister);
2554
2555 int lfsck_add_target(const struct lu_env *env, struct dt_device *key,
2556                      struct dt_device *tgt, struct obd_export *exp,
2557                      __u32 index, bool for_ost)
2558 {
2559         struct lfsck_instance   *lfsck;
2560         struct lfsck_tgt_desc   *ltd;
2561         int                      rc;
2562         ENTRY;
2563
2564         OBD_ALLOC_PTR(ltd);
2565         if (ltd == NULL)
2566                 RETURN(-ENOMEM);
2567
2568         ltd->ltd_tgt = tgt;
2569         ltd->ltd_key = key;
2570         ltd->ltd_exp = exp;
2571         INIT_LIST_HEAD(&ltd->ltd_orphan_list);
2572         INIT_LIST_HEAD(&ltd->ltd_layout_list);
2573         INIT_LIST_HEAD(&ltd->ltd_layout_phase_list);
2574         atomic_set(&ltd->ltd_ref, 1);
2575         ltd->ltd_index = index;
2576
2577         spin_lock(&lfsck_instance_lock);
2578         lfsck = __lfsck_instance_find(key, true, false);
2579         if (lfsck == NULL) {
2580                 if (for_ost)
2581                         list_add_tail(&ltd->ltd_orphan_list,
2582                                       &lfsck_ost_orphan_list);
2583                 else
2584                         list_add_tail(&ltd->ltd_orphan_list,
2585                                       &lfsck_mdt_orphan_list);
2586                 spin_unlock(&lfsck_instance_lock);
2587
2588                 RETURN(0);
2589         }
2590         spin_unlock(&lfsck_instance_lock);
2591
2592         rc = __lfsck_add_target(env, lfsck, ltd, for_ost, false);
2593         if (rc != 0)
2594                 lfsck_tgt_put(ltd);
2595
2596         lfsck_instance_put(env, lfsck);
2597
2598         RETURN(rc);
2599 }
2600 EXPORT_SYMBOL(lfsck_add_target);
2601
2602 void lfsck_del_target(const struct lu_env *env, struct dt_device *key,
2603                       struct dt_device *tgt, __u32 index, bool for_ost)
2604 {
2605         struct lfsck_instance   *lfsck;
2606         struct lfsck_tgt_descs  *ltds;
2607         struct lfsck_tgt_desc   *ltd    = NULL;
2608         struct list_head        *head;
2609
2610         if (for_ost)
2611                 head = &lfsck_ost_orphan_list;
2612         else
2613                 head = &lfsck_mdt_orphan_list;
2614
2615         spin_lock(&lfsck_instance_lock);
2616         list_for_each_entry(ltd, head, ltd_orphan_list) {
2617                 if (ltd->ltd_tgt == tgt) {
2618                         list_del_init(&ltd->ltd_orphan_list);
2619                         spin_unlock(&lfsck_instance_lock);
2620                         lfsck_tgt_put(ltd);
2621
2622                         return;
2623                 }
2624         }
2625
2626         lfsck = __lfsck_instance_find(key, true, false);
2627         spin_unlock(&lfsck_instance_lock);
2628         if (unlikely(lfsck == NULL))
2629                 return;
2630
2631         if (for_ost)
2632                 ltds = &lfsck->li_ost_descs;
2633         else
2634                 ltds = &lfsck->li_mdt_descs;
2635
2636         down_write(&ltds->ltd_rw_sem);
2637         LASSERT(ltds->ltd_tgts_bitmap != NULL);
2638
2639         if (unlikely(index >= ltds->ltd_tgts_bitmap->size))
2640                 goto unlock;
2641
2642         ltd = LTD_TGT(ltds, index);
2643         if (unlikely(ltd == NULL))
2644                 goto unlock;
2645
2646         LASSERT(ltds->ltd_tgtnr > 0);
2647
2648         ltds->ltd_tgtnr--;
2649         cfs_bitmap_clear(ltds->ltd_tgts_bitmap, index);
2650         LTD_TGT(ltds, index) = NULL;
2651
2652 unlock:
2653         if (ltd == NULL) {
2654                 if (for_ost)
2655                         head = &lfsck->li_ost_descs.ltd_orphan;
2656                 else
2657                         head = &lfsck->li_ost_descs.ltd_orphan;
2658
2659                 list_for_each_entry(ltd, head, ltd_orphan_list) {
2660                         if (ltd->ltd_tgt == tgt) {
2661                                 list_del_init(&ltd->ltd_orphan_list);
2662                                 break;
2663                         }
2664                 }
2665         }
2666
2667         up_write(&ltds->ltd_rw_sem);
2668         if (ltd != NULL) {
2669                 spin_lock(&ltds->ltd_lock);
2670                 ltd->ltd_dead = 1;
2671                 spin_unlock(&ltds->ltd_lock);
2672                 lfsck_stop_notify(env, lfsck, ltds, ltd, LT_LAYOUT);
2673                 lfsck_tgt_put(ltd);
2674         }
2675
2676         lfsck_instance_put(env, lfsck);
2677 }
2678 EXPORT_SYMBOL(lfsck_del_target);
2679
2680 static int __init lfsck_init(void)
2681 {
2682         int rc;
2683
2684         INIT_LIST_HEAD(&lfsck_ost_orphan_list);
2685         INIT_LIST_HEAD(&lfsck_mdt_orphan_list);
2686         lfsck_key_init_generic(&lfsck_thread_key, NULL);
2687         rc = lu_context_key_register(&lfsck_thread_key);
2688         if (rc == 0) {
2689                 tgt_register_lfsck_in_notify(lfsck_in_notify);
2690                 tgt_register_lfsck_query(lfsck_query);
2691         }
2692
2693         return rc;
2694 }
2695
2696 static void __exit lfsck_exit(void)
2697 {
2698         struct lfsck_tgt_desc *ltd;
2699         struct lfsck_tgt_desc *next;
2700
2701         LASSERT(cfs_list_empty(&lfsck_instance_list));
2702
2703         list_for_each_entry_safe(ltd, next, &lfsck_ost_orphan_list,
2704                                  ltd_orphan_list) {
2705                 list_del_init(&ltd->ltd_orphan_list);
2706                 lfsck_tgt_put(ltd);
2707         }
2708
2709         list_for_each_entry_safe(ltd, next, &lfsck_mdt_orphan_list,
2710                                  ltd_orphan_list) {
2711                 list_del_init(&ltd->ltd_orphan_list);
2712                 lfsck_tgt_put(ltd);
2713         }
2714
2715         lu_context_key_degister(&lfsck_thread_key);
2716 }
2717
2718 MODULE_AUTHOR("Intel Corporation <http://www.intel.com/>");
2719 MODULE_DESCRIPTION("LFSCK");
2720 MODULE_LICENSE("GPL");
2721
2722 cfs_module(lfsck, LUSTRE_VERSION_STRING, lfsck_init, lfsck_exit);