lustre/lfsck/lfsck_engine.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) 2013, 2016, Intel Corporation.
  24  */
  25 /*
  26  * lustre/lfsck/lfsck_engine.c
  27  *
  28  * Author: Fan, Yong <fan.yong@intel.com>
  29  */
  30
  31 #define DEBUG_SUBSYSTEM S_LFSCK
  32
  33 #include <lu_object.h>
  34 #include <dt_object.h>
  35 #include <lustre_net.h>
  36 #include <lustre_fid.h>
  37 #include <obd_support.h>
  38 #include <lustre_lib.h>
  39
  40 #include "lfsck_internal.h"
  41
  42 int lfsck_unpack_ent(struct lu_dirent *ent, __u64 *cookie, __u16 *type)
  43 {
  44         struct luda_type        *lt;
  45         int                      align = sizeof(*lt) - 1;
  46         int                      len;
  47
  48         fid_le_to_cpu(&ent->lde_fid, &ent->lde_fid);
  49         *cookie = le64_to_cpu(ent->lde_hash);
  50         ent->lde_reclen = le16_to_cpu(ent->lde_reclen);
  51         ent->lde_namelen = le16_to_cpu(ent->lde_namelen);
  52         ent->lde_attrs = le32_to_cpu(ent->lde_attrs);
  53
  54         if (unlikely(!(ent->lde_attrs & LUDA_TYPE)))
  55                 return -EINVAL;
  56
  57         len = (ent->lde_namelen + align) & ~align;
  58         lt = (struct luda_type *)(ent->lde_name + len);
  59         *type = le16_to_cpu(lt->lt_type);
  60
  61         /* Make sure the name is terminated with '\0'. The data (object type)
  62          * after ent::lde_name maybe broken, but we have stored such data in
  63          * the output parameter @type as above. */
  64         ent->lde_name[ent->lde_namelen] = '\0';
  65
  66         return 0;
  67 }
  68
  69 static void lfsck_di_oit_put(const struct lu_env *env, struct lfsck_instance *lfsck)
  70 {
  71         const struct dt_it_ops  *iops;
  72         struct dt_it            *di;
  73
  74         spin_lock(&lfsck->li_lock);
  75         iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
  76         di = lfsck->li_di_oit;
  77         lfsck->li_di_oit = NULL;
  78         spin_unlock(&lfsck->li_lock);
  79         iops->put(env, di);
  80 }
  81
  82 static void lfsck_di_dir_put(const struct lu_env *env, struct lfsck_instance *lfsck)
  83 {
  84         const struct dt_it_ops  *iops;
  85         struct dt_it            *di;
  86
  87         spin_lock(&lfsck->li_lock);
  88         iops = &lfsck->li_obj_dir->do_index_ops->dio_it;
  89         di = lfsck->li_di_dir;
  90         lfsck->li_di_dir = NULL;
  91         lfsck->li_cookie_dir = 0;
  92         spin_unlock(&lfsck->li_lock);
  93         iops->put(env, di);
  94 }
  95
  96 static int lfsck_parent_fid(const struct lu_env *env, struct dt_object *obj,
  97                             struct lu_fid *fid)
  98 {
  99         if (unlikely(!S_ISDIR(lfsck_object_type(obj)) ||
 100                      !dt_try_as_dir(env, obj)))
 101                 return -ENOTDIR;
 102
 103         return dt_lookup(env, obj, (struct dt_rec *)fid,
 104                          (const struct dt_key *)"..");
 105 }
 106
 107 /**
 108  * Check whether needs to scan the directory or not.
 109  *
 110  * 1) If we are not doing namespace LFSCK, or the given @obj is not directory,
 111  *    then needs not to scan the @obj. Otherwise,
 112  * 2) Global /ROOT needs to be scanned, backend root needs not to be scanned.
 113  * 3) If the @obj is neither IGIF nor normal FID (including .lustre and its
 114  *    sub-directories that have been scanned when the LFSCK engine start),
 115  *    then needs not to be scanned.
 116  * 4) If it is a remote object, then scanning the object will be done on the
 117  *    MDT on which the object really resides.
 118  * 5) If the local object has normal FID, then needs to be scanned. Otherwise,
 119  * 6) If the object has linkEA, then needs to be scanned. Otherwise,
 120  * 7) If none of the previous conditions are true, we need to check the parent
 121  *    directories whether this subdirectory is in a tree that should be scanned.
 122  *    Set the parent as current @obj, repeat 2)-7).
 123  *
 124  * \param[in] env       pointer to the thread context
 125  * \param[in] lfsck     pointer to the lfsck instance
 126  * \param[in] obj       pointer to the object to be checked
 127  *
 128  * \retval              positive number if the directory needs to be scanned
 129  * \retval              0 if the directory needs NOT to be scanned
 130  * \retval              negative error number on failure
 131  */
 132 static int lfsck_needs_scan_dir(const struct lu_env *env,
 133                                 struct lfsck_instance *lfsck,
 134                                 struct dt_object *obj)
 135 {
 136         struct lfsck_thread_info *info    = lfsck_env_info(env);
 137         struct lu_fid            *fid     = &info->lti_fid;
 138         struct lu_seq_range      *range   = &info->lti_range;
 139         struct lu_attr           *la      = &info->lti_la;
 140         struct seq_server_site   *ss      = lfsck_dev_site(lfsck);
 141         __u32                     idx     = lfsck_dev_idx(lfsck);
 142         int                       depth   = 0;
 143         int                       rc      = 0;
 144
 145         if (list_empty(&lfsck->li_list_dir) || !S_ISDIR(lfsck_object_type(obj)))
 146                 return 0;
 147
 148         *fid = *lfsck_dto2fid(obj);
 149         rc = dt_attr_get(env, obj, la);
 150         if (unlikely(rc || (la->la_valid & LA_FLAGS &&
 151                             la->la_flags & LUSTRE_ORPHAN_FL))) {
 152                 /* Orphan directory is empty, does not need scan. */
 153                 CDEBUG(D_INFO,
 154                        "%s: skip orphan dir "DFID", %llx/%x: rc = %d\n",
 155                        lfsck_lfsck2name(lfsck), PFID(fid),
 156                        la->la_valid, la->la_flags, rc);
 157
 158                 return rc;
 159         }
 160
 161         LASSERT(ss != NULL);
 162
 163         while (1) {
 164                 /* Global /ROOT is visible. */
 165                 if (unlikely(lu_fid_eq(fid, &lfsck->li_global_root_fid)))
 166                         return 1;
 167
 168                 /* Backend root is invisible. */
 169                 if (unlikely(lu_fid_eq(fid, &lfsck->li_local_root_fid)))
 170                         return 0;
 171
 172                 if (!fid_is_norm(fid) && !fid_is_igif(fid))
 173                         return 0;
 174
 175                 fld_range_set_mdt(range);
 176                 rc = fld_local_lookup(env, ss->ss_server_fld,
 177                                       fid_seq(fid), range);
 178                 if (rc != 0 || range->lsr_index != idx)
 179                         /* Current FID should NOT be for the input parameter
 180                          * @obj, because the lfsck_master_oit_engine() has
 181                          * filtered out agent object. So current FID is for
 182                          * the ancestor of the original input parameter @obj.
 183                          * So the ancestor is a remote directory. The input
 184                          * parameter @obj is local directory, and should be
 185                          * scanned under such case. */
 186                         return 1;
 187
 188                 /* normal FID on this target (locally) must be for the
 189                  * client-side visiable object. */
 190                 if (fid_is_norm(fid))
 191                         return 1;
 192
 193                 /* Only true after "obj = NULL" set below */
 194                 if (obj == NULL) {
 195                         obj = lfsck_object_find_bottom(env, lfsck, fid);
 196                         if (IS_ERR(obj))
 197                                 return PTR_ERR(obj);
 198
 199                         depth++;
 200                         if (!dt_object_exists(obj))
 201                                 GOTO(out, rc = 0);
 202                 }
 203
 204                 dt_read_lock(env, obj, DT_TGT_CHILD);
 205                 if (unlikely(lfsck_is_dead_obj(obj))) {
 206                         dt_read_unlock(env, obj);
 207
 208                         GOTO(out, rc = 0);
 209                 }
 210
 211                 rc = dt_xattr_get(env, obj,
 212                                   lfsck_buf_get(env, NULL, 0), XATTR_NAME_LINK);
 213                 dt_read_unlock(env, obj);
 214                 if (rc >= 0)
 215                         GOTO(out, rc = 1);
 216
 217                 if (rc < 0 && rc != -ENODATA)
 218                         GOTO(out, rc);
 219
 220                 rc = lfsck_parent_fid(env, obj, fid);
 221                 if (depth > 0)
 222                         lfsck_object_put(env, obj);
 223
 224                 obj = NULL;
 225                 if (rc != 0)
 226                         return rc;
 227
 228                 if (!fid_is_sane(fid))
 229                         return 0;
 230         }
 231
 232 out:
 233         if (depth > 0 && obj != NULL)
 234                 lfsck_object_put(env, obj);
 235
 236         return rc;
 237 }
 238
 239 static int lfsck_load_stripe_lmv(const struct lu_env *env,
 240                                  struct lfsck_instance *lfsck,
 241                                  struct dt_object *obj)
 242 {
 243         struct lmv_mds_md_v1    *lmv    = &lfsck_env_info(env)->lti_lmv;
 244         struct lfsck_lmv        *llmv;
 245         int                      rc;
 246         ENTRY;
 247
 248         LASSERT(lfsck->li_obj_dir == NULL);
 249         LASSERT(lfsck->li_lmv == NULL);
 250
 251         rc = lfsck_read_stripe_lmv(env, lfsck, obj, lmv);
 252         if (rc == -ENODATA) {
 253                 lfsck->li_obj_dir = lfsck_object_get(obj);
 254
 255                 RETURN(0);
 256         }
 257
 258         if (rc < 0)
 259                 RETURN(rc);
 260
 261         OBD_ALLOC_PTR(llmv);
 262         if (llmv == NULL)
 263                 RETURN(-ENOMEM);
 264
 265         if (lmv->lmv_magic == LMV_MAGIC) {
 266                 struct lfsck_slave_lmv_rec      *lslr;
 267                 __u32                            stripes;
 268
 269                 llmv->ll_lmv_master = 1;
 270                 if (lmv->lmv_stripe_count < 1)
 271                         stripes = LFSCK_LMV_DEF_STRIPES;
 272                 else if (lmv->lmv_stripe_count > LFSCK_LMV_MAX_STRIPES)
 273                         stripes = LFSCK_LMV_MAX_STRIPES;
 274                 else
 275                         stripes = lmv->lmv_stripe_count;
 276
 277                 OBD_ALLOC_LARGE(lslr, sizeof(*lslr) * stripes);
 278                 if (lslr == NULL) {
 279                         OBD_FREE_PTR(llmv);
 280
 281                         RETURN(-ENOMEM);
 282                 }
 283
 284                 llmv->ll_stripes_allocated = stripes;
 285                 llmv->ll_hash_type = LMV_HASH_TYPE_UNKNOWN;
 286                 llmv->ll_lslr = lslr;
 287         } else {
 288                 llmv->ll_lmv_slave = 1;
 289         }
 290
 291         lfsck->li_obj_dir = lfsck_object_get(obj);
 292         llmv->ll_lmv = *lmv;
 293         atomic_set(&llmv->ll_ref, 1);
 294         lfsck->li_lmv = llmv;
 295
 296         RETURN(0);
 297 }
 298
 299 /* LFSCK wrap functions */
 300
 301 static void lfsck_fail(const struct lu_env *env, struct lfsck_instance *lfsck,
 302                        bool new_checked)
 303 {
 304         struct lfsck_component *com;
 305
 306         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 307                 com->lc_ops->lfsck_fail(env, com, new_checked);
 308         }
 309 }
 310
 311 void lfsck_close_dir(const struct lu_env *env,
 312                      struct lfsck_instance *lfsck, int result)
 313 {
 314         struct lfsck_component *com;
 315         ENTRY;
 316
 317         if (lfsck->li_lmv != NULL) {
 318                 lfsck->li_lmv->ll_exit_value = result;
 319                 if (lfsck->li_obj_dir != NULL) {
 320                         list_for_each_entry(com, &lfsck->li_list_dir,
 321                                             lc_link_dir) {
 322                                 com->lc_ops->lfsck_close_dir(env, com);
 323                         }
 324                 }
 325
 326                 lfsck_lmv_put(env, lfsck->li_lmv);
 327                 lfsck->li_lmv = NULL;
 328         }
 329
 330         if (lfsck->li_di_dir != NULL) {
 331                 const struct dt_it_ops  *dir_iops;
 332                 struct dt_it            *dir_di   = lfsck->li_di_dir;
 333
 334                 LASSERT(lfsck->li_obj_dir != NULL);
 335
 336                 dir_iops = &lfsck->li_obj_dir->do_index_ops->dio_it;
 337                 lfsck_di_dir_put(env, lfsck);
 338                 dir_iops->fini(env, dir_di);
 339         }
 340
 341         if (lfsck->li_obj_dir != NULL) {
 342                 struct dt_object        *dir_obj  = lfsck->li_obj_dir;
 343
 344                 lfsck->li_obj_dir = NULL;
 345                 lfsck_object_put(env, dir_obj);
 346         }
 347
 348         EXIT;
 349 }
 350
 351 int lfsck_open_dir(const struct lu_env *env,
 352                    struct lfsck_instance *lfsck, __u64 cookie)
 353 {
 354         struct dt_object        *obj    = lfsck->li_obj_dir;
 355         struct dt_it            *di     = lfsck->li_di_dir;
 356         struct lfsck_component  *com;
 357         const struct dt_it_ops  *iops;
 358         int                      rc     = 0;
 359         ENTRY;
 360
 361         LASSERT(obj != NULL);
 362         LASSERT(di == NULL);
 363
 364         if (unlikely(!dt_try_as_dir(env, obj)))
 365                 GOTO(out, rc = -ENOTDIR);
 366
 367         list_for_each_entry(com, &lfsck->li_list_dir, lc_link_dir) {
 368                 rc = com->lc_ops->lfsck_open_dir(env, com);
 369                 if (rc != 0)
 370                         GOTO(out, rc);
 371         }
 372
 373         iops = &obj->do_index_ops->dio_it;
 374         di = iops->init(env, obj, lfsck->li_args_dir);
 375         if (IS_ERR(di))
 376                 GOTO(out, rc = PTR_ERR(di));
 377
 378         rc = iops->load(env, di, cookie);
 379         if (rc == -ENODATA)
 380                 rc = 1;
 381         else if (rc == 0 || (rc > 0 && cookie > 0))
 382                 rc = iops->next(env, di);
 383         else if (rc > 0)
 384                 rc = 0;
 385
 386         if (rc != 0) {
 387                 iops->put(env, di);
 388                 iops->fini(env, di);
 389         } else {
 390                 lfsck->li_cookie_dir = iops->store(env, di);
 391                 spin_lock(&lfsck->li_lock);
 392                 lfsck->li_di_dir = di;
 393                 spin_unlock(&lfsck->li_lock);
 394         }
 395
 396         GOTO(out, rc);
 397
 398 out:
 399         if (rc != 0)
 400                 lfsck_close_dir(env, lfsck, rc);
 401
 402         return rc;
 403 }
 404
 405 static int lfsck_checkpoint(const struct lu_env *env,
 406                             struct lfsck_instance *lfsck)
 407 {
 408         struct lfsck_component *com;
 409         int                     rc  = 0;
 410         int                     rc1 = 0;
 411
 412         if (likely(ktime_get_seconds() <= lfsck->li_time_next_checkpoint))
 413                 return 0;
 414
 415         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
 416         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 417                 rc = com->lc_ops->lfsck_checkpoint(env, com, false);
 418                 if (rc != 0)
 419                         rc1 = rc;
 420         }
 421
 422         lfsck->li_time_last_checkpoint = ktime_get_seconds();
 423         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 424                                          LFSCK_CHECKPOINT_INTERVAL;
 425         return rc1 != 0 ? rc1 : rc;
 426 }
 427
 428 static int lfsck_prep(const struct lu_env *env, struct lfsck_instance *lfsck,
 429                       struct lfsck_start_param *lsp)
 430 {
 431         struct dt_object       *obj     = NULL;
 432         struct lfsck_component *com;
 433         struct lfsck_component *next;
 434         struct lfsck_position  *pos     = NULL;
 435         const struct dt_it_ops *iops    =
 436                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
 437         int                     rc;
 438         ENTRY;
 439
 440         LASSERT(lfsck->li_obj_dir == NULL);
 441         LASSERT(lfsck->li_di_dir == NULL);
 442
 443         lfsck->li_current_oit_processed = 0;
 444         list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
 445                 com->lc_new_checked = 0;
 446                 rc = com->lc_ops->lfsck_prep(env, com, lsp);
 447                 if (rc != 0)
 448                         GOTO(out, rc);
 449
 450                 if ((pos == NULL) ||
 451                     (!lfsck_pos_is_zero(&com->lc_pos_start) &&
 452                      lfsck_pos_is_eq(pos, &com->lc_pos_start) > 0))
 453                         pos = &com->lc_pos_start;
 454         }
 455
 456         /* Init otable-based iterator. */
 457         if (pos == NULL) {
 458                 rc = iops->load(env, lfsck->li_di_oit, 0);
 459                 if (rc > 0 || unlikely(rc == -ENODATA)) {
 460                         lfsck->li_oit_over = 1;
 461                         rc = 0;
 462                 }
 463
 464                 GOTO(out, rc);
 465         }
 466
 467         rc = iops->load(env, lfsck->li_di_oit, pos->lp_oit_cookie);
 468         if (rc > 0 || unlikely(rc == -ENODATA))
 469                 lfsck->li_oit_over = 1;
 470         else if (rc < 0)
 471                 GOTO(out, rc);
 472
 473         if (!lfsck->li_master || fid_is_zero(&pos->lp_dir_parent))
 474                 GOTO(out, rc = 0);
 475
 476         /* Find the directory for namespace-based traverse. */
 477         obj = lfsck_object_find_bottom(env, lfsck, &pos->lp_dir_parent);
 478         if (IS_ERR(obj))
 479                 RETURN(PTR_ERR(obj));
 480
 481         /* Remote directory will be scanned by the LFSCK instance
 482          * on the MDT where the remote object really resides on. */
 483         if (!dt_object_exists(obj) || dt_object_remote(obj) ||
 484             unlikely(!S_ISDIR(lfsck_object_type(obj))))
 485                 GOTO(out, rc = 0);
 486
 487         rc = lfsck_load_stripe_lmv(env, lfsck, obj);
 488         if (rc == 0) {
 489                 /* For the master MDT-object of a striped directory,
 490                  * reset the iteration from the directory beginning. */
 491                 if (lfsck->li_lmv != NULL && lfsck->li_lmv->ll_lmv_master)
 492                         pos->lp_dir_cookie = 0;
 493
 494                 rc = lfsck_open_dir(env, lfsck, pos->lp_dir_cookie);
 495                 if (rc > 0)
 496                         /* The end of the directory. */
 497                         rc = 0;
 498         }
 499
 500         GOTO(out, rc);
 501
 502 out:
 503         if (obj != NULL)
 504                 lfsck_object_put(env, obj);
 505
 506         if (rc != 0) {
 507                 lfsck_close_dir(env, lfsck, rc);
 508                 list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
 509                                          lc_link) {
 510                         com->lc_ops->lfsck_post(env, com, rc, true);
 511                 }
 512
 513                 return rc;
 514         }
 515
 516         rc = 0;
 517         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, true);
 518         lfsck->li_pos_current = lfsck->li_pos_checkpoint;
 519         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 520                 rc = com->lc_ops->lfsck_checkpoint(env, com, true);
 521                 if (rc != 0)
 522                         break;
 523         }
 524
 525         lfsck->li_time_last_checkpoint = ktime_get_seconds();
 526         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 527                                          LFSCK_CHECKPOINT_INTERVAL;
 528         return rc;
 529 }
 530
 531 static int lfsck_exec_oit(const struct lu_env *env,
 532                           struct lfsck_instance *lfsck, struct dt_object *obj)
 533 {
 534         struct lfsck_component *com;
 535         int                     rc;
 536         ENTRY;
 537
 538         LASSERT(lfsck->li_obj_dir == NULL);
 539
 540         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 541                 rc = com->lc_ops->lfsck_exec_oit(env, com, obj);
 542                 if (rc != 0)
 543                         RETURN(rc);
 544         }
 545
 546         rc = lfsck_needs_scan_dir(env, lfsck, obj);
 547         if (rc <= 0)
 548                 GOTO(out, rc);
 549
 550         rc = lfsck_load_stripe_lmv(env, lfsck, obj);
 551         if (rc == 0)
 552                 rc = lfsck_open_dir(env, lfsck, 0);
 553
 554         GOTO(out, rc);
 555
 556 out:
 557         if (rc < 0)
 558                 lfsck_fail(env, lfsck, false);
 559
 560         if (rc != 0)
 561                 lfsck_close_dir(env, lfsck, rc);
 562
 563         return rc > 0 ? 0 : rc;
 564 }
 565
 566 static int lfsck_exec_dir(const struct lu_env *env,
 567                           struct lfsck_instance *lfsck,
 568                           struct lfsck_assistant_object *lso,
 569                           struct lu_dirent *ent, __u16 type)
 570 {
 571         struct lfsck_component *com;
 572         int                     rc;
 573
 574         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 575                 rc = com->lc_ops->lfsck_exec_dir(env, com, lso, ent, type);
 576                 if (rc != 0)
 577                         return rc;
 578         }
 579         return 0;
 580 }
 581
 582 static int lfsck_master_dir_engine(const struct lu_env *env,
 583                                    struct lfsck_instance *lfsck);
 584
 585 static int lfsck_post(const struct lu_env *env, struct lfsck_instance *lfsck,
 586                       int result)
 587 {
 588         struct lfsck_component *com;
 589         struct lfsck_component *next;
 590         int                     rc  = result;
 591
 592         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
 593         lfsck_close_dir(env, lfsck, result);
 594
 595         while (thread_is_running(&lfsck->li_thread) && rc > 0 &&
 596                !list_empty(&lfsck->li_list_lmv)) {
 597                 struct lfsck_lmv_unit *llu;
 598
 599                 spin_lock(&lfsck->li_lock);
 600                 llu = list_entry(lfsck->li_list_lmv.next,
 601                                  struct lfsck_lmv_unit, llu_link);
 602                 list_del_init(&llu->llu_link);
 603                 spin_unlock(&lfsck->li_lock);
 604
 605                 lfsck->li_lmv = &llu->llu_lmv;
 606                 lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
 607                 rc = lfsck_open_dir(env, lfsck, 0);
 608                 if (rc == 0) {
 609                         rc = lfsck_master_dir_engine(env, lfsck);
 610                         lfsck_close_dir(env, lfsck, result);
 611                 }
 612         }
 613
 614         result = rc;
 615
 616         list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
 617                 rc = com->lc_ops->lfsck_post(env, com, result, false);
 618                 if (rc != 0)
 619                         CDEBUG(D_LFSCK, "%s: lfsck_post at the component %u: "
 620                                "rc = %d\n", lfsck_lfsck2name(lfsck),
 621                                (__u32)com->lc_type, rc);
 622         }
 623
 624         lfsck->li_time_last_checkpoint = ktime_get_seconds();
 625         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 626                                          LFSCK_CHECKPOINT_INTERVAL;
 627
 628         /* Ignore some component post failure to make other can go ahead. */
 629         return result;
 630 }
 631
 632 static int lfsck_double_scan(const struct lu_env *env,
 633                              struct lfsck_instance *lfsck)
 634 {
 635         struct lfsck_component *com;
 636         struct lfsck_component *next;
 637         struct l_wait_info      lwi = { 0 };
 638         int                     rc  = 0;
 639         int                     rc1 = 0;
 640
 641         list_for_each_entry(com, &lfsck->li_list_double_scan, lc_link) {
 642                 rc = com->lc_ops->lfsck_double_scan(env, com);
 643                 if (rc != 0)
 644                         rc1 = rc;
 645         }
 646
 647         l_wait_event(lfsck->li_thread.t_ctl_waitq,
 648                      atomic_read(&lfsck->li_double_scan_count) == 0,
 649                      &lwi);
 650
 651         if (lfsck->li_status != LS_PAUSED &&
 652             lfsck->li_status != LS_CO_PAUSED) {
 653                 list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
 654                                          lc_link) {
 655                         spin_lock(&lfsck->li_lock);
 656                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 657                         spin_unlock(&lfsck->li_lock);
 658                 }
 659         }
 660
 661         return rc1 != 0 ? rc1 : rc;
 662 }
 663
 664 static void lfsck_quit(const struct lu_env *env, struct lfsck_instance *lfsck)
 665 {
 666         struct lfsck_component *com;
 667         struct lfsck_component *next;
 668
 669         list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
 670                                  lc_link) {
 671                 if (com->lc_ops->lfsck_quit != NULL)
 672                         com->lc_ops->lfsck_quit(env, com);
 673
 674                 spin_lock(&lfsck->li_lock);
 675                 list_del_init(&com->lc_link_dir);
 676                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 677                 spin_unlock(&lfsck->li_lock);
 678         }
 679
 680         list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
 681                                  lc_link) {
 682                 if (com->lc_ops->lfsck_quit != NULL)
 683                         com->lc_ops->lfsck_quit(env, com);
 684
 685                 spin_lock(&lfsck->li_lock);
 686                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 687                 spin_unlock(&lfsck->li_lock);
 688         }
 689 }
 690
 691 /* LFSCK engines */
 692
 693 static int lfsck_master_dir_engine(const struct lu_env *env,
 694                                    struct lfsck_instance *lfsck)
 695 {
 696         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 697         struct dt_object                *dir    = lfsck->li_obj_dir;
 698         const struct dt_it_ops          *iops   = &dir->do_index_ops->dio_it;
 699         struct dt_it                    *di     = lfsck->li_di_dir;
 700         struct lu_dirent                *ent    =
 701                         (struct lu_dirent *)info->lti_key;
 702         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
 703         struct ptlrpc_thread            *thread = &lfsck->li_thread;
 704         struct lfsck_assistant_object   *lso    = NULL;
 705         int                              rc;
 706         __u16                            type;
 707         ENTRY;
 708
 709         do {
 710                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY2, cfs_fail_val) &&
 711                     unlikely(!thread_is_running(thread))) {
 712                         CDEBUG(D_LFSCK, "%s: scan dir exit for engine stop, "
 713                                "parent "DFID", cookie %#llx\n",
 714                                lfsck_lfsck2name(lfsck),
 715                                PFID(lfsck_dto2fid(dir)), lfsck->li_cookie_dir);
 716
 717                         GOTO(out, rc = 0);
 718                 }
 719
 720                 lfsck->li_new_scanned++;
 721                 rc = iops->rec(env, di, (struct dt_rec *)ent,
 722                                lfsck->li_args_dir);
 723                 if (rc == 0)
 724                         rc = lfsck_unpack_ent(ent, &lfsck->li_cookie_dir,
 725                                               &type);
 726
 727                 if (rc != 0) {
 728                         CDEBUG(D_LFSCK, "%s: scan dir failed at rec(), "
 729                                "parent "DFID", cookie %#llx: rc = %d\n",
 730                                lfsck_lfsck2name(lfsck),
 731                                PFID(lfsck_dto2fid(dir)),
 732                                lfsck->li_cookie_dir, rc);
 733                         lfsck_fail(env, lfsck, true);
 734                         if (bk->lb_param & LPF_FAILOUT)
 735                                 GOTO(out, rc);
 736                         else
 737                                 goto checkpoint;
 738                 }
 739
 740                 if (ent->lde_attrs & LUDA_IGNORE)
 741                         goto checkpoint;
 742
 743                 /* skip dot entry. */
 744                 if (ent->lde_namelen == 1 && ent->lde_name[0] == '.')
 745                         goto checkpoint;
 746
 747                 if (lso == NULL) {
 748                         lso = lfsck_assistant_object_init(env,
 749                                 lfsck_dto2fid(dir), NULL,
 750                                 lfsck->li_pos_current.lp_oit_cookie, true);
 751                         if (IS_ERR(lso)) {
 752                                 if (bk->lb_param & LPF_FAILOUT)
 753                                         RETURN(PTR_ERR(lso));
 754
 755                                 lso = NULL;
 756                                 goto checkpoint;
 757                         }
 758                 }
 759
 760                 /* The type in the @ent structure may has been overwritten,
 761                  * so we need to pass the @type parameter independently. */
 762                 rc = lfsck_exec_dir(env, lfsck, lso, ent, type);
 763                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 764                         GOTO(out, rc);
 765
 766 checkpoint:
 767                 rc = lfsck_checkpoint(env, lfsck);
 768                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 769                         GOTO(out, rc);
 770
 771                 /* Rate control. */
 772                 lfsck_control_speed(lfsck);
 773                 if (unlikely(!thread_is_running(thread))) {
 774                         CDEBUG(D_LFSCK, "%s: scan dir exit for engine stop, "
 775                                "parent "DFID", cookie %#llx\n",
 776                                lfsck_lfsck2name(lfsck),
 777                                PFID(lfsck_dto2fid(dir)),
 778                                lfsck->li_cookie_dir);
 779                         GOTO(out, rc = 0);
 780                 }
 781
 782                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL2)) {
 783                         spin_lock(&lfsck->li_lock);
 784                         thread_set_flags(thread, SVC_STOPPING);
 785                         spin_unlock(&lfsck->li_lock);
 786                         GOTO(out, rc = -EINVAL);
 787                 }
 788
 789                 rc = iops->next(env, di);
 790                 if (rc < 0)
 791                         CDEBUG(D_LFSCK, "%s dir engine fail to locate next "
 792                                "for the directory "DFID": rc = %d\n",
 793                                lfsck_lfsck2name(lfsck),
 794                                PFID(&lfsck->li_pos_current.lp_dir_parent), rc);
 795         } while (rc == 0);
 796
 797         if (rc > 0 && !lfsck->li_oit_over)
 798                 lfsck_close_dir(env, lfsck, rc);
 799
 800         GOTO(out, rc);
 801
 802 out:
 803         if (lso != NULL)
 804                 lfsck_assistant_object_put(env, lso);
 805
 806         return rc;
 807 }
 808
 809 /**
 810  * Object-table based iteration engine.
 811  *
 812  * Object-table based iteration is the basic linear engine to scan all the
 813  * objects on current device in turn. For each object, it calls all the
 814  * registered LFSCK component(s)' API to perform related consistency
 815  * verification.
 816  *
 817  * It flushes related LFSCK trace files to disk via making checkpoint
 818  * periodically. Then if the server crashed or the LFSCK is paused, the
 819  * LFSCK can resume from the latest checkpoint.
 820  *
 821  * It also controls the whole LFSCK speed via lfsck_control_speed() to
 822  * avoid the server to become overload.
 823  *
 824  * \param[in] env       pointer to the thread context
 825  * \param[in] lfsck     pointer to the lfsck instance
 826  *
 827  * \retval              positive number if all objects have been scanned
 828  * \retval              0 if the iteration is stopped or paused
 829  * \retval              negative error number on failure
 830  */
 831 static int lfsck_master_oit_engine(const struct lu_env *env,
 832                                    struct lfsck_instance *lfsck)
 833 {
 834         struct lfsck_thread_info *info  = lfsck_env_info(env);
 835         const struct dt_it_ops   *iops  =
 836                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
 837         struct dt_it             *di    = lfsck->li_di_oit;
 838         struct lu_fid            *fid   = &info->lti_fid;
 839         struct lfsck_bookmark    *bk    = &lfsck->li_bookmark_ram;
 840         struct ptlrpc_thread     *thread = &lfsck->li_thread;
 841         struct seq_server_site   *ss    = lfsck_dev_site(lfsck);
 842         __u32                    idx    = lfsck_dev_idx(lfsck);
 843         int                      rc;
 844         ENTRY;
 845
 846         if (unlikely(ss == NULL))
 847                 RETURN(-EIO);
 848
 849         do {
 850                 struct dt_object *target;
 851
 852                 if (lfsck->li_di_dir != NULL) {
 853                         rc = lfsck_master_dir_engine(env, lfsck);
 854                         if (rc <= 0)
 855                                 RETURN(rc);
 856                 }
 857
 858                 if (unlikely(lfsck->li_oit_over))
 859                         RETURN(1);
 860
 861                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY1, cfs_fail_val) &&
 862                     unlikely(!thread_is_running(thread))) {
 863                         CDEBUG(D_LFSCK, "%s: OIT scan exit for engine stop, "
 864                                "cookie %llu\n",
 865                                lfsck_lfsck2name(lfsck), iops->store(env, di));
 866
 867                         RETURN(0);
 868                 }
 869
 870                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_CRASH))
 871                         RETURN(0);
 872
 873                 lfsck->li_current_oit_processed = 1;
 874
 875                 if (!list_empty(&lfsck->li_list_lmv)) {
 876                         struct lfsck_lmv_unit *llu;
 877
 878                         spin_lock(&lfsck->li_lock);
 879                         llu = list_entry(lfsck->li_list_lmv.next,
 880                                          struct lfsck_lmv_unit, llu_link);
 881                         list_del_init(&llu->llu_link);
 882                         spin_unlock(&lfsck->li_lock);
 883
 884                         lfsck->li_lmv = &llu->llu_lmv;
 885                         lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
 886                         rc = lfsck_open_dir(env, lfsck, 0);
 887                         if (rc == 0)
 888                                 rc = lfsck_master_dir_engine(env, lfsck);
 889
 890                         if (rc <= 0)
 891                                 RETURN(rc);
 892                 }
 893
 894                 lfsck->li_new_scanned++;
 895                 lfsck->li_pos_current.lp_oit_cookie = iops->store(env, di);
 896                 rc = iops->rec(env, di, (struct dt_rec *)fid, 0);
 897                 if (rc != 0) {
 898                         CDEBUG(D_LFSCK, "%s: OIT scan failed at rec(): "
 899                                "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 900                         lfsck_fail(env, lfsck, true);
 901                         if (rc < 0 && bk->lb_param & LPF_FAILOUT)
 902                                 RETURN(rc);
 903                         else
 904                                 goto checkpoint;
 905                 }
 906
 907                 if (unlikely(!fid_is_sane(fid))) {
 908                         CDEBUG(D_LFSCK, "%s: OIT scan find invalid FID "DFID
 909                                ", skip it\n",
 910                                lfsck_lfsck2name(lfsck), PFID(fid));
 911                         goto checkpoint;
 912                 }
 913
 914                 if (fid_is_idif(fid)) {
 915                         __u32 idx1 = fid_idif_ost_idx(fid);
 916
 917                         LASSERT(!lfsck->li_master);
 918
 919                         if (idx != idx1) {
 920                                 struct ost_id *oi = &info->lti_oi;
 921
 922                                 if (unlikely(idx1 != 0)) {
 923                                         CDEBUG(D_LFSCK, "%s: invalid IDIF "DFID
 924                                                ", not match device index %u\n",
 925                                                lfsck_lfsck2name(lfsck),
 926                                                PFID(fid), idx);
 927
 928                                         goto checkpoint;
 929                                 }
 930
 931                                 /* rebuild the IDIF with index to
 932                                  * avoid double instances for the
 933                                  * same object. */
 934                                 fid_to_ostid(fid, oi);
 935                                 ostid_to_fid(fid, oi, idx);
 936                         }
 937                 } else if (!fid_is_norm(fid) && !fid_is_igif(fid) &&
 938                            !fid_is_last_id(fid) &&
 939                            !lu_fid_eq(fid, &lfsck->li_global_root_fid)) {
 940
 941                         /* If the FID/object is only used locally and invisible
 942                          * to external nodes, then LFSCK will not handle it.
 943                          *
 944                          * dot_lustre sequence has been handled specially. */
 945                         goto checkpoint;
 946                 } else {
 947                         struct lu_seq_range *range = &info->lti_range;
 948
 949                         if (lfsck->li_master)
 950                                 fld_range_set_mdt(range);
 951                         else
 952                                 fld_range_set_ost(range);
 953                         rc = fld_local_lookup(env, ss->ss_server_fld,
 954                                               fid_seq(fid), range);
 955                         if (rc != 0 || range->lsr_index != idx) {
 956                                 /* Remote object will be handled by the LFSCK
 957                                  * instance on the MDT where the remote object
 958                                  * really resides on. */
 959                                 rc = 0;
 960                                 goto checkpoint;
 961                         }
 962                 }
 963
 964                 target = lfsck_object_find_bottom(env, lfsck, fid);
 965                 if (IS_ERR(target)) {
 966                         CDEBUG(D_LFSCK, "%s: OIT scan failed at find target "
 967                                DFID", cookie %llu: rc = %d\n",
 968                                lfsck_lfsck2name(lfsck), PFID(fid),
 969                                iops->store(env, di), rc);
 970                         lfsck_fail(env, lfsck, true);
 971                         if (bk->lb_param & LPF_FAILOUT)
 972                                 RETURN(PTR_ERR(target));
 973                         else
 974                                 goto checkpoint;
 975                 }
 976
 977                 if (dt_object_exists(target))
 978                         rc = lfsck_exec_oit(env, lfsck, target);
 979
 980                 lfsck_object_put(env, target);
 981                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 982                         RETURN(rc);
 983
 984 checkpoint:
 985                 rc = lfsck_checkpoint(env, lfsck);
 986                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 987                         RETURN(rc);
 988
 989                 /* Rate control. */
 990                 lfsck_control_speed(lfsck);
 991
 992                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL1)) {
 993                         spin_lock(&lfsck->li_lock);
 994                         thread_set_flags(thread, SVC_STOPPING);
 995                         spin_unlock(&lfsck->li_lock);
 996                         RETURN(-EINVAL);
 997                 }
 998
 999                 rc = iops->next(env, di);
1000                 if (unlikely(rc > 0))
1001                         lfsck->li_oit_over = 1;
1002                 else if (likely(rc == 0))
1003                         lfsck->li_current_oit_processed = 0;
1004                 else
1005                         CDEBUG(D_LFSCK, "%s oit engine fail to locate next at "
1006                                "%llu: rc = %d\n", lfsck_lfsck2name(lfsck),
1007                                iops->store(env, di), rc);
1008
1009                 if (unlikely(!thread_is_running(thread))) {
1010                         CDEBUG(D_LFSCK, "%s: OIT scan exit for engine stop, "
1011                                "cookie %llu\n", lfsck_lfsck2name(lfsck),
1012                                iops->store(env, di));
1013                         RETURN(0);
1014                 }
1015         } while (rc == 0 || lfsck->li_di_dir != NULL);
1016
1017         RETURN(rc);
1018 }
1019
1020 int lfsck_master_engine(void *args)
1021 {
1022         struct lfsck_thread_args *lta      = args;
1023         struct lu_env            *env      = &lta->lta_env;
1024         struct lfsck_instance    *lfsck    = lta->lta_lfsck;
1025         struct ptlrpc_thread     *thread   = &lfsck->li_thread;
1026         struct dt_object         *oit_obj  = lfsck->li_obj_oit;
1027         const struct dt_it_ops   *oit_iops = &oit_obj->do_index_ops->dio_it;
1028         struct dt_it             *oit_di;
1029         struct l_wait_info        lwi      = { 0 };
1030         int                       rc;
1031         ENTRY;
1032
1033         spin_lock(&lfsck->li_lock);
1034         lfsck->li_task = current;
1035         spin_unlock(&lfsck->li_lock);
1036
1037         /* There will be some objects verification during the LFSCK start,
1038          * such as the subsequent lfsck_verify_lpf(). Trigger low layer OI
1039          * OI scrub before that to handle the potential inconsistence. */
1040         oit_di = oit_iops->init(env, oit_obj, lfsck->li_args_oit);
1041         if (IS_ERR(oit_di)) {
1042                 rc = PTR_ERR(oit_di);
1043                 CDEBUG(D_LFSCK, "%s: master engine fail to init iteration: "
1044                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
1045
1046                 GOTO(fini_args, rc);
1047         }
1048
1049         if (lfsck->li_master &&
1050             (!list_empty(&lfsck->li_list_scan) ||
1051              !list_empty(&lfsck->li_list_double_scan))) {
1052                 rc = lfsck_verify_lpf(env, lfsck);
1053                 /* Fail to verify the .lustre/lost+found/MDTxxxx/ may be not
1054                  * fatal, because the .lustre/lost+found/ maybe not accessed
1055                  * by the LFSCK if it does not add orphans or others to such
1056                  * directory. So go ahead until hit failure when really uses
1057                  * the directory. */
1058                 if (rc != 0)
1059                         CDEBUG(D_LFSCK, "%s: master engine fail to verify the "
1060                                ".lustre/lost+found/, go ahead: rc = %d\n",
1061                                lfsck_lfsck2name(lfsck), rc);
1062         }
1063
1064         spin_lock(&lfsck->li_lock);
1065         lfsck->li_di_oit = oit_di;
1066         spin_unlock(&lfsck->li_lock);
1067         rc = lfsck_prep(env, lfsck, lta->lta_lsp);
1068         if (rc != 0)
1069                 GOTO(fini_oit, rc);
1070
1071         CDEBUG(D_LFSCK, "LFSCK entry: oit_flags = %#x, dir_flags = %#x, "
1072                "oit_cookie = %llu, dir_cookie = %#llx, parent = "DFID
1073                ", pid = %d\n", lfsck->li_args_oit, lfsck->li_args_dir,
1074                lfsck->li_pos_checkpoint.lp_oit_cookie,
1075                lfsck->li_pos_checkpoint.lp_dir_cookie,
1076                PFID(&lfsck->li_pos_checkpoint.lp_dir_parent),
1077                current_pid());
1078
1079         spin_lock(&lfsck->li_lock);
1080         if (unlikely(!thread_is_starting(thread))) {
1081                 spin_unlock(&lfsck->li_lock);
1082                 GOTO(fini_oit, rc = 0);
1083         }
1084
1085         thread_set_flags(thread, SVC_RUNNING);
1086         spin_unlock(&lfsck->li_lock);
1087         wake_up_all(&thread->t_ctl_waitq);
1088
1089         l_wait_event(thread->t_ctl_waitq,
1090                      lfsck->li_start_unplug ||
1091                      !thread_is_running(thread),
1092                      &lwi);
1093         if (!thread_is_running(thread))
1094                 GOTO(fini_oit, rc = 0);
1095
1096         if (!list_empty(&lfsck->li_list_scan) ||
1097             list_empty(&lfsck->li_list_double_scan))
1098                 rc = lfsck_master_oit_engine(env, lfsck);
1099         else
1100                 rc = 1;
1101
1102         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
1103         CDEBUG(D_LFSCK, "LFSCK exit: oit_flags = %#x, dir_flags = %#x, "
1104                "oit_cookie = %llu, dir_cookie = %#llx, parent = "DFID
1105                ", pid = %d, rc = %d\n", lfsck->li_args_oit, lfsck->li_args_dir,
1106                lfsck->li_pos_checkpoint.lp_oit_cookie,
1107                lfsck->li_pos_checkpoint.lp_dir_cookie,
1108                PFID(&lfsck->li_pos_checkpoint.lp_dir_parent),
1109                current_pid(), rc);
1110
1111         if (!OBD_FAIL_CHECK(OBD_FAIL_LFSCK_CRASH))
1112                 rc = lfsck_post(env, lfsck, rc);
1113         else
1114                 lfsck_close_dir(env, lfsck, rc);
1115
1116 fini_oit:
1117         lfsck_di_oit_put(env, lfsck);
1118         oit_iops->fini(env, oit_di);
1119         if (rc == 1) {
1120                 if (!list_empty(&lfsck->li_list_double_scan))
1121                         rc = lfsck_double_scan(env, lfsck);
1122                 else
1123                         rc = 0;
1124         } else {
1125                 lfsck_quit(env, lfsck);
1126         }
1127
1128         /* XXX: Purge the pinned objects in the future. */
1129
1130 fini_args:
1131         spin_lock(&lfsck->li_lock);
1132         thread_set_flags(thread, SVC_STOPPED);
1133         lfsck->li_task = NULL;
1134         spin_unlock(&lfsck->li_lock);
1135         wake_up_all(&thread->t_ctl_waitq);
1136         lfsck_thread_args_fini(lta);
1137         return rc;
1138 }
1139
1140 static inline bool lfsck_assistant_req_empty(struct lfsck_assistant_data *lad)
1141 {
1142         bool empty = false;
1143
1144         spin_lock(&lad->lad_lock);
1145         if (list_empty(&lad->lad_req_list))
1146                 empty = true;
1147         spin_unlock(&lad->lad_lock);
1148
1149         return empty;
1150 }
1151
1152 /**
1153  * Query the LFSCK status from the instatnces on remote servers.
1154  *
1155  * The LFSCK assistant thread queries the LFSCK instances on other
1156  * servers (MDT/OST) about their status, such as whether they have
1157  * finished the phase1/phase2 scanning or not, and so on.
1158  *
1159  * \param[in] env       pointer to the thread context
1160  * \param[in] com       pointer to the lfsck component
1161  *
1162  * \retval              0 for success
1163  * \retval              negative error number on failure
1164  */
1165 static int lfsck_assistant_query_others(const struct lu_env *env,
1166                                         struct lfsck_component *com)
1167 {
1168         struct lfsck_thread_info          *info  = lfsck_env_info(env);
1169         struct lfsck_request              *lr    = &info->lti_lr;
1170         struct lfsck_async_interpret_args *laia  = &info->lti_laia;
1171         struct lfsck_instance             *lfsck = com->lc_lfsck;
1172         struct lfsck_assistant_data       *lad   = com->lc_data;
1173         struct ptlrpc_request_set         *set;
1174         struct lfsck_tgt_descs            *ltds;
1175         struct lfsck_tgt_desc             *ltd;
1176         struct list_head                  *phase_head;
1177         int                                rc    = 0;
1178         int                                rc1   = 0;
1179         ENTRY;
1180
1181         set = ptlrpc_prep_set();
1182         if (set == NULL)
1183                 RETURN(-ENOMEM);
1184
1185         lad->lad_touch_gen++;
1186         memset(lr, 0, sizeof(*lr));
1187         lr->lr_event = LE_QUERY;
1188         lr->lr_active = com->lc_type;
1189
1190         memset(laia, 0, sizeof(*laia));
1191         laia->laia_com = com;
1192         laia->laia_lr = lr;
1193
1194         if (!list_empty(&lad->lad_mdt_phase1_list)) {
1195                 ltds = &lfsck->li_mdt_descs;
1196                 lr->lr_flags = 0;
1197                 phase_head = &lad->lad_mdt_phase1_list;
1198         } else if (com->lc_type != LFSCK_TYPE_LAYOUT) {
1199                 goto out;
1200         } else {
1201
1202 again:
1203                 ltds = &lfsck->li_ost_descs;
1204                 lr->lr_flags = LEF_TO_OST;
1205                 phase_head = &lad->lad_ost_phase1_list;
1206         }
1207
1208         laia->laia_ltds = ltds;
1209         spin_lock(&ltds->ltd_lock);
1210         while (!list_empty(phase_head)) {
1211                 struct list_head *phase_list;
1212                 __u32            *gen;
1213
1214                 if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1215                         ltd = list_entry(phase_head->next,
1216                                          struct lfsck_tgt_desc,
1217                                          ltd_layout_phase_list);
1218                         phase_list = &ltd->ltd_layout_phase_list;
1219                         gen = &ltd->ltd_layout_gen;
1220                 } else {
1221                         ltd = list_entry(phase_head->next,
1222                                          struct lfsck_tgt_desc,
1223                                          ltd_namespace_phase_list);
1224                         phase_list = &ltd->ltd_namespace_phase_list;
1225                         gen = &ltd->ltd_namespace_gen;
1226                 }
1227
1228                 if (*gen == lad->lad_touch_gen)
1229                         break;
1230
1231                 *gen = lad->lad_touch_gen;
1232                 list_move_tail(phase_list, phase_head);
1233                 atomic_inc(&ltd->ltd_ref);
1234                 laia->laia_ltd = ltd;
1235                 spin_unlock(&ltds->ltd_lock);
1236                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1237                                          lfsck_async_interpret_common,
1238                                          laia, LFSCK_QUERY);
1239                 if (rc != 0) {
1240                         CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to query "
1241                                "%s %x for %s: rc = %d\n",
1242                                lfsck_lfsck2name(lfsck),
1243                                (lr->lr_flags & LEF_TO_OST) ? "OST" : "MDT",
1244                                ltd->ltd_index, lad->lad_name, rc);
1245                         lfsck_tgt_put(ltd);
1246                         rc1 = rc;
1247                 }
1248                 spin_lock(&ltds->ltd_lock);
1249         }
1250         spin_unlock(&ltds->ltd_lock);
1251
1252         rc = ptlrpc_set_wait(env, set);
1253         if (rc < 0) {
1254                 ptlrpc_set_destroy(set);
1255                 RETURN(rc);
1256         }
1257
1258         if (com->lc_type == LFSCK_TYPE_LAYOUT && !(lr->lr_flags & LEF_TO_OST) &&
1259             list_empty(&lad->lad_mdt_phase1_list))
1260                 goto again;
1261
1262 out:
1263         ptlrpc_set_destroy(set);
1264
1265         RETURN(rc1 != 0 ? rc1 : rc);
1266 }
1267
1268 /**
1269  * Notify the LFSCK event to the instances on remote servers.
1270  *
1271  * The LFSCK assistant thread notifies the LFSCK instances on other
1272  * servers (MDT/OST) about some events, such as start new scanning,
1273  * stop the scanning, this LFSCK instance will exit, and so on.
1274  *
1275  * \param[in] env       pointer to the thread context
1276  * \param[in] com       pointer to the lfsck component
1277  * \param[in] lr        pointer to the LFSCK event request
1278  *
1279  * \retval              0 for success
1280  * \retval              negative error number on failure
1281  */
1282 static int lfsck_assistant_notify_others(const struct lu_env *env,
1283                                          struct lfsck_component *com,
1284                                          struct lfsck_request *lr)
1285 {
1286         struct lfsck_thread_info          *info  = lfsck_env_info(env);
1287         struct lfsck_async_interpret_args *laia  = &info->lti_laia;
1288         struct lfsck_instance             *lfsck = com->lc_lfsck;
1289         struct lfsck_assistant_data       *lad   = com->lc_data;
1290         struct lfsck_bookmark             *bk    = &lfsck->li_bookmark_ram;
1291         struct ptlrpc_request_set         *set;
1292         struct lfsck_tgt_descs            *ltds;
1293         struct lfsck_tgt_desc             *ltd;
1294         struct lfsck_tgt_desc             *next;
1295         __u32                              idx;
1296         int                                rc    = 0;
1297         int                                rc1   = 0;
1298         ENTRY;
1299
1300         set = ptlrpc_prep_set();
1301         if (set == NULL)
1302                 RETURN(-ENOMEM);
1303
1304         lr->lr_index = lfsck_dev_idx(lfsck);
1305         lr->lr_active = com->lc_type;
1306
1307         memset(laia, 0, sizeof(*laia));
1308         laia->laia_com = com;
1309         laia->laia_lr = lr;
1310
1311         switch (lr->lr_event) {
1312         case LE_START:
1313                 if (com->lc_type != LFSCK_TYPE_LAYOUT)
1314                         goto next;
1315
1316                 lr->lr_valid = LSV_SPEED_LIMIT | LSV_ERROR_HANDLE | LSV_DRYRUN;
1317                 lr->lr_speed = bk->lb_speed_limit;
1318                 lr->lr_version = bk->lb_version;
1319                 lr->lr_param |= bk->lb_param;
1320                 lr->lr_async_windows = bk->lb_async_windows;
1321                 lr->lr_flags = LEF_TO_OST;
1322
1323                 /* Notify OSTs firstly, then handle other MDTs if needed. */
1324                 ltds = &lfsck->li_ost_descs;
1325                 laia->laia_ltds = ltds;
1326                 down_read(&ltds->ltd_rw_sem);
1327                 cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1328                         ltd = lfsck_tgt_get(ltds, idx);
1329                         LASSERT(ltd != NULL);
1330
1331                         laia->laia_ltd = ltd;
1332                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1333                                         lfsck_async_interpret_common,
1334                                         laia, LFSCK_NOTIFY);
1335                         if (rc != 0) {
1336                                 lfsck_lad_set_bitmap(env, com, idx);
1337                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
1338                                        "notify OST %x for %s start: rc = %d\n",
1339                                        lfsck_lfsck2name(lfsck), idx,
1340                                        lad->lad_name, rc);
1341                                 lfsck_tgt_put(ltd);
1342                         }
1343                 }
1344                 up_read(&ltds->ltd_rw_sem);
1345
1346                 /* Sync up */
1347                 rc = ptlrpc_set_wait(env, set);
1348                 if (rc < 0) {
1349                         ptlrpc_set_destroy(set);
1350                         RETURN(rc);
1351                 }
1352
1353 next:
1354                 if (!(bk->lb_param & LPF_ALL_TGT))
1355                         break;
1356
1357                 /* link other MDT targets locallly. */
1358                 ltds = &lfsck->li_mdt_descs;
1359                 spin_lock(&ltds->ltd_lock);
1360                 if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1361                         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1362                                 ltd = lfsck_ltd2tgt(ltds, idx);
1363                                 LASSERT(ltd != NULL);
1364
1365                                 if (!list_empty(&ltd->ltd_layout_list))
1366                                         continue;
1367
1368                                 list_add_tail(&ltd->ltd_layout_list,
1369                                               &lad->lad_mdt_list);
1370                                 list_add_tail(&ltd->ltd_layout_phase_list,
1371                                               &lad->lad_mdt_phase1_list);
1372                         }
1373                 } else {
1374                         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1375                                 ltd = lfsck_ltd2tgt(ltds, idx);
1376                                 LASSERT(ltd != NULL);
1377
1378                                 if (!list_empty(&ltd->ltd_namespace_list))
1379                                         continue;
1380
1381                                 list_add_tail(&ltd->ltd_namespace_list,
1382                                               &lad->lad_mdt_list);
1383                                 list_add_tail(&ltd->ltd_namespace_phase_list,
1384                                               &lad->lad_mdt_phase1_list);
1385                         }
1386                 }
1387                 spin_unlock(&ltds->ltd_lock);
1388                 break;
1389         case LE_STOP:
1390         case LE_PHASE2_DONE:
1391         case LE_PEER_EXIT: {
1392                 struct list_head *phase_head;
1393
1394                 /* Handle other MDTs firstly if needed, then notify the OSTs. */
1395                 if (bk->lb_param & LPF_ALL_TGT) {
1396                         phase_head = &lad->lad_mdt_list;
1397                         ltds = &lfsck->li_mdt_descs;
1398                         if (lr->lr_event == LE_STOP) {
1399                                 /* unlink other MDT targets locallly. */
1400                                 spin_lock(&ltds->ltd_lock);
1401                                 if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1402                                         list_for_each_entry_safe(ltd, next,
1403                                                 phase_head, ltd_layout_list) {
1404                                                 list_del_init(
1405                                                 &ltd->ltd_layout_phase_list);
1406                                                 list_del_init(
1407                                                 &ltd->ltd_layout_list);
1408                                         }
1409                                 } else {
1410                                         list_for_each_entry_safe(ltd, next,
1411                                                         phase_head,
1412                                                         ltd_namespace_list) {
1413                                                 list_del_init(
1414                                                 &ltd->ltd_namespace_phase_list);
1415                                                 list_del_init(
1416                                                 &ltd->ltd_namespace_list);
1417                                         }
1418                                 }
1419                                 spin_unlock(&ltds->ltd_lock);
1420
1421                                 if (com->lc_type != LFSCK_TYPE_LAYOUT)
1422                                         break;
1423
1424                                 lr->lr_flags |= LEF_TO_OST;
1425                                 phase_head = &lad->lad_ost_list;
1426                                 ltds = &lfsck->li_ost_descs;
1427                         } else {
1428                                 lr->lr_flags &= ~LEF_TO_OST;
1429                         }
1430                 } else if (com->lc_type != LFSCK_TYPE_LAYOUT) {
1431                         break;
1432                 } else {
1433                         lr->lr_flags |= LEF_TO_OST;
1434                         phase_head = &lad->lad_ost_list;
1435                         ltds = &lfsck->li_ost_descs;
1436                 }
1437
1438 again:
1439                 laia->laia_ltds = ltds;
1440                 spin_lock(&ltds->ltd_lock);
1441                 while (!list_empty(phase_head)) {
1442                         if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1443                                 ltd = list_entry(phase_head->next,
1444                                                  struct lfsck_tgt_desc,
1445                                                  ltd_layout_list);
1446                                 if (!list_empty(&ltd->ltd_layout_phase_list))
1447                                         list_del_init(
1448                                                 &ltd->ltd_layout_phase_list);
1449                                 list_del_init(&ltd->ltd_layout_list);
1450                         } else {
1451                                 ltd = list_entry(phase_head->next,
1452                                                  struct lfsck_tgt_desc,
1453                                                  ltd_namespace_list);
1454                                 if (!list_empty(&ltd->ltd_namespace_phase_list))
1455                                         list_del_init(
1456                                                 &ltd->ltd_namespace_phase_list);
1457                                 list_del_init(&ltd->ltd_namespace_list);
1458                         }
1459                         atomic_inc(&ltd->ltd_ref);
1460                         laia->laia_ltd = ltd;
1461                         spin_unlock(&ltds->ltd_lock);
1462                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1463                                         lfsck_async_interpret_common,
1464                                         laia, LFSCK_NOTIFY);
1465                         if (rc != 0) {
1466                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
1467                                        "notify %s %x for %s stop/phase2_done/"
1468                                        "peer_exit: rc = %d\n",
1469                                        lfsck_lfsck2name(lfsck),
1470                                        (lr->lr_flags & LEF_TO_OST) ?
1471                                        "OST" : "MDT", ltd->ltd_index,
1472                                        lad->lad_name, rc);
1473                                 lfsck_tgt_put(ltd);
1474                         }
1475                         spin_lock(&ltds->ltd_lock);
1476                 }
1477                 spin_unlock(&ltds->ltd_lock);
1478
1479                 rc = ptlrpc_set_wait(env, set);
1480                 if (rc < 0) {
1481                         ptlrpc_set_destroy(set);
1482                         RETURN(rc);
1483                 }
1484
1485                 if (com->lc_type == LFSCK_TYPE_LAYOUT &&
1486                     !(lr->lr_flags & LEF_TO_OST)) {
1487                         lr->lr_flags |= LEF_TO_OST;
1488                         phase_head = &lad->lad_ost_list;
1489                         ltds = &lfsck->li_ost_descs;
1490                         goto again;
1491                 }
1492                 break;
1493         }
1494         case LE_PHASE1_DONE:
1495                 lad->lad_ops->la_sync_failures(env, com, lr);
1496                 lad->lad_touch_gen++;
1497                 ltds = &lfsck->li_mdt_descs;
1498                 laia->laia_ltds = ltds;
1499                 spin_lock(&ltds->ltd_lock);
1500                 while (!list_empty(&lad->lad_mdt_list)) {
1501                         struct list_head *list;
1502                         __u32            *gen;
1503
1504                         if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1505                                 ltd = list_entry(lad->lad_mdt_list.next,
1506                                                  struct lfsck_tgt_desc,
1507                                                  ltd_layout_list);
1508                                 list = &ltd->ltd_layout_list;
1509                                 gen = &ltd->ltd_layout_gen;
1510                         } else {
1511                                 struct lfsck_namespace *ns = com->lc_file_ram;
1512
1513                                 ltd = list_entry(lad->lad_mdt_list.next,
1514                                                  struct lfsck_tgt_desc,
1515                                                  ltd_namespace_list);
1516                                 list = &ltd->ltd_namespace_list;
1517                                 gen = &ltd->ltd_namespace_gen;
1518                                 lr->lr_flags2 = ns->ln_flags & ~LF_INCOMPLETE;
1519                         }
1520
1521                         if (*gen == lad->lad_touch_gen)
1522                                 break;
1523
1524                         *gen = lad->lad_touch_gen;
1525                         list_move_tail(list, &lad->lad_mdt_list);
1526                         if (ltd->ltd_synced_failures)
1527                                 continue;
1528
1529                         atomic_inc(&ltd->ltd_ref);
1530                         laia->laia_ltd = ltd;
1531                         spin_unlock(&ltds->ltd_lock);
1532                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1533                                         lfsck_async_interpret_common,
1534                                         laia, LFSCK_NOTIFY);
1535                         if (rc != 0) {
1536                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
1537                                        "notify MDT %x for %s phase1 done: "
1538                                        "rc = %d\n", lfsck_lfsck2name(lfsck),
1539                                        ltd->ltd_index, lad->lad_name, rc);
1540                                 lfsck_tgt_put(ltd);
1541                         }
1542                         spin_lock(&ltds->ltd_lock);
1543                 }
1544                 spin_unlock(&ltds->ltd_lock);
1545                 break;
1546         default:
1547                 CDEBUG(D_LFSCK, "%s: LFSCK assistant unexpected LFSCK event: "
1548                        "rc = %d\n", lfsck_lfsck2name(lfsck), lr->lr_event);
1549                 rc = -EINVAL;
1550                 break;
1551         }
1552
1553         rc1 = ptlrpc_set_wait(env, set);
1554         ptlrpc_set_destroy(set);
1555
1556         RETURN(rc != 0 ? rc : rc1);
1557 }
1558
1559 /**
1560  * The LFSCK assistant thread is triggered by the LFSCK main engine.
1561  * They co-work together as an asynchronous pipeline: the LFSCK main
1562  * engine scans the system and pre-fetches the objects, attributes,
1563  * or name entries, etc, and pushes them into the pipeline as input
1564  * requests for the LFSCK assistant thread; on the other end of the
1565  * pipeline, the LFSCK assistant thread performs the real check and
1566  * repair for every request from the main engine.
1567  *
1568  * Generally, the assistant engine may be blocked when check/repair
1569  * something, so the LFSCK main engine will run some faster. On the
1570  * other hand, the LFSCK main engine will drive multiple assistant
1571  * threads in parallel, means for each LFSCK component on the master
1572  * (such as layout LFSCK, namespace LFSCK), there is an independent
1573  * LFSCK assistant thread. So under such 1:N multiple asynchronous
1574  * pipelines mode, the whole LFSCK performance will be much better
1575  * than check/repair everything by the LFSCK main engine itself.
1576  */
1577 int lfsck_assistant_engine(void *args)
1578 {
1579         struct lfsck_thread_args          *lta     = args;
1580         struct lu_env                     *env     = &lta->lta_env;
1581         struct lfsck_component            *com     = lta->lta_com;
1582         struct lfsck_instance             *lfsck   = lta->lta_lfsck;
1583         struct lfsck_bookmark             *bk      = &lfsck->li_bookmark_ram;
1584         struct lfsck_position             *pos     = &com->lc_pos_start;
1585         struct lfsck_thread_info          *info    = lfsck_env_info(env);
1586         struct lfsck_request              *lr      = &info->lti_lr;
1587         struct lfsck_assistant_data       *lad     = com->lc_data;
1588         struct ptlrpc_thread              *mthread = &lfsck->li_thread;
1589         struct ptlrpc_thread              *athread = &lad->lad_thread;
1590         struct lfsck_assistant_operations *lao     = lad->lad_ops;
1591         struct lfsck_assistant_req        *lar;
1592         struct l_wait_info                 lwi     = { 0 };
1593         int                                rc      = 0;
1594         int                                rc1     = 0;
1595         int                                rc2;
1596         ENTRY;
1597
1598         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread start\n",
1599                lfsck_lfsck2name(lfsck), lad->lad_name);
1600
1601         memset(lr, 0, sizeof(*lr));
1602         lr->lr_event = LE_START;
1603         if (pos->lp_oit_cookie <= 1)
1604                 lr->lr_param = LPF_RESET;
1605         rc = lfsck_assistant_notify_others(env, com, lr);
1606         if (rc != 0) {
1607                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to notify others "
1608                        "to start %s: rc = %d\n",
1609                        lfsck_lfsck2name(lfsck), lad->lad_name, rc);
1610                 GOTO(fini, rc);
1611         }
1612
1613         spin_lock(&lad->lad_lock);
1614         lad->lad_task = current;
1615         thread_set_flags(athread, SVC_RUNNING);
1616         spin_unlock(&lad->lad_lock);
1617         wake_up_all(&mthread->t_ctl_waitq);
1618
1619         while (1) {
1620                 while (!list_empty(&lad->lad_req_list)) {
1621                         bool wakeup = false;
1622
1623                         if (unlikely(test_bit(LAD_EXIT, &lad->lad_flags) ||
1624                                      !thread_is_running(mthread)))
1625                                 GOTO(cleanup, rc = lad->lad_post_result);
1626
1627                         lar = list_entry(lad->lad_req_list.next,
1628                                          struct lfsck_assistant_req,
1629                                          lar_list);
1630                         /* Only the lfsck_assistant_engine thread itself can
1631                          * remove the "lar" from the head of the list, LFSCK
1632                          * engine thread only inserts other new "lar" at the
1633                          * end of the list. So it is safe to handle current
1634                          * "lar" without the spin_lock. */
1635                         rc = lao->la_handler_p1(env, com, lar);
1636                         spin_lock(&lad->lad_lock);
1637                         list_del_init(&lar->lar_list);
1638                         lad->lad_prefetched--;
1639                         /* Wake up the main engine thread only when the list
1640                          * is empty or half of the prefetched items have been
1641                          * handled to avoid too frequent thread schedule. */
1642                         if (lad->lad_prefetched <= (bk->lb_async_windows / 2))
1643                                 wakeup = true;
1644                         spin_unlock(&lad->lad_lock);
1645                         if (wakeup)
1646                                 wake_up_all(&mthread->t_ctl_waitq);
1647
1648                         lao->la_req_fini(env, lar);
1649                         if (rc < 0 && bk->lb_param & LPF_FAILOUT)
1650                                 GOTO(cleanup, rc);
1651                 }
1652
1653                 l_wait_event(athread->t_ctl_waitq,
1654                              !lfsck_assistant_req_empty(lad) ||
1655                              test_bit(LAD_EXIT, &lad->lad_flags) ||
1656                              test_bit(LAD_TO_POST, &lad->lad_flags) ||
1657                              test_bit(LAD_TO_DOUBLE_SCAN, &lad->lad_flags),
1658                              &lwi);
1659
1660                 if (unlikely(test_bit(LAD_EXIT, &lad->lad_flags)))
1661                         GOTO(cleanup, rc = lad->lad_post_result);
1662
1663                 if (!list_empty(&lad->lad_req_list))
1664                         continue;
1665
1666                 if (test_bit(LAD_TO_POST, &lad->lad_flags)) {
1667                         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread post\n",
1668                                lfsck_lfsck2name(lfsck), lad->lad_name);
1669
1670                         if (unlikely(test_bit(LAD_EXIT, &lad->lad_flags)))
1671                                 GOTO(cleanup, rc = lad->lad_post_result);
1672
1673                         clear_bit(LAD_TO_POST, &lad->lad_flags);
1674                         LASSERT(lad->lad_post_result > 0);
1675
1676                         /* Wakeup the master engine to go ahead. */
1677                         wake_up_all(&mthread->t_ctl_waitq);
1678
1679                         memset(lr, 0, sizeof(*lr));
1680                         lr->lr_event = LE_PHASE1_DONE;
1681                         lr->lr_status = lad->lad_post_result;
1682                         rc = lfsck_assistant_notify_others(env, com, lr);
1683
1684                         CDEBUG(D_LFSCK, "%s: LFSCK assistant notified "
1685                                "others for %s post: rc = %d\n",
1686                                lfsck_lfsck2name(lfsck),
1687                                lad->lad_name, rc);
1688                 }
1689
1690                 if (test_bit(LAD_TO_DOUBLE_SCAN, &lad->lad_flags)) {
1691                         clear_bit(LAD_TO_DOUBLE_SCAN, &lad->lad_flags);
1692                         atomic_inc(&lfsck->li_double_scan_count);
1693                         set_bit(LAD_IN_DOUBLE_SCAN, &lad->lad_flags);
1694                         wake_up_all(&mthread->t_ctl_waitq);
1695
1696                         com->lc_new_checked = 0;
1697                         com->lc_new_scanned = 0;
1698                         com->lc_time_last_checkpoint = ktime_get_seconds();
1699                         com->lc_time_next_checkpoint =
1700                                 com->lc_time_last_checkpoint +
1701                                 LFSCK_CHECKPOINT_INTERVAL;
1702
1703                         CDEBUG(D_LFSCK, "%s: LFSCK assistant sync before "
1704                                "the second-stage scaning\n",
1705                                lfsck_lfsck2name(lfsck));
1706
1707                         /* Flush async updates before handling orphan. */
1708                         rc2 = dt_sync(env, lfsck->li_next);
1709
1710                         CDEBUG(D_LFSCK, "%s: LFSCK assistant phase2 "
1711                                "scan start, synced: rc = %d\n",
1712                                lfsck_lfsck2name(lfsck), rc2);
1713
1714                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_NO_DOUBLESCAN))
1715                                 GOTO(cleanup, rc = 0);
1716
1717                         while (test_bit(LAD_IN_DOUBLE_SCAN, &lad->lad_flags)) {
1718                                 rc = lfsck_assistant_query_others(env, com);
1719                                 if (lfsck_phase2_next_ready(lad))
1720                                         goto p2_next;
1721
1722                                 if (rc < 0)
1723                                         GOTO(cleanup, rc);
1724
1725                                 /* Pull LFSCK status on related targets once
1726                                  * per 30 seconds if we are not notified. */
1727                                 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(30),
1728                                                            cfs_time_seconds(1),
1729                                                            NULL, NULL);
1730                                 rc = l_wait_event(athread->t_ctl_waitq,
1731                                         lfsck_phase2_next_ready(lad) ||
1732                                         test_bit(LAD_EXIT, &lad->lad_flags) ||
1733                                         !thread_is_running(mthread),
1734                                         &lwi);
1735
1736                                 if (unlikely(
1737                                         test_bit(LAD_EXIT, &lad->lad_flags) ||
1738                                         !thread_is_running(mthread)))
1739                                         GOTO(cleanup, rc = 0);
1740
1741                                 if (rc == -ETIMEDOUT)
1742                                         continue;
1743
1744                                 if (rc < 0)
1745                                         GOTO(cleanup, rc);
1746
1747 p2_next:
1748                                 rc = lao->la_handler_p2(env, com);
1749                                 if (rc != 0)
1750                                         GOTO(cleanup, rc);
1751
1752                                 if (unlikely(
1753                                         test_bit(LAD_EXIT, &lad->lad_flags) ||
1754                                         !thread_is_running(mthread)))
1755                                         GOTO(cleanup, rc = 0);
1756                         }
1757                 }
1758         }
1759
1760 cleanup:
1761         /* Cleanup the unfinished requests. */
1762         spin_lock(&lad->lad_lock);
1763         if (rc < 0)
1764                 lad->lad_assistant_status = rc;
1765
1766         if (test_bit(LAD_EXIT, &lad->lad_flags) && lad->lad_post_result <= 0)
1767                 lao->la_fill_pos(env, com, &lfsck->li_pos_checkpoint);
1768
1769         thread_set_flags(athread, SVC_STOPPING);
1770         while (!list_empty(&lad->lad_req_list)) {
1771                 lar = list_entry(lad->lad_req_list.next,
1772                                  struct lfsck_assistant_req,
1773                                  lar_list);
1774                 list_del_init(&lar->lar_list);
1775                 lad->lad_prefetched--;
1776                 spin_unlock(&lad->lad_lock);
1777                 lao->la_req_fini(env, lar);
1778                 spin_lock(&lad->lad_lock);
1779         }
1780         spin_unlock(&lad->lad_lock);
1781
1782         memset(lr, 0, sizeof(*lr));
1783         if (rc > 0) {
1784                 lr->lr_event = LE_PHASE2_DONE;
1785                 lr->lr_status = rc;
1786         } else if (rc == 0) {
1787                 if (lfsck->li_flags & LPF_ALL_TGT) {
1788                         lr->lr_event = LE_STOP;
1789                         lr->lr_status = LS_STOPPED;
1790                 } else {
1791                         lr->lr_event = LE_PEER_EXIT;
1792                         switch (lfsck->li_status) {
1793                         case LS_PAUSED:
1794                         case LS_CO_PAUSED:
1795                                 lr->lr_status = LS_CO_PAUSED;
1796                                 break;
1797                         case LS_STOPPED:
1798                         case LS_CO_STOPPED:
1799                                 lr->lr_status = LS_CO_STOPPED;
1800                                 break;
1801                         default:
1802                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant unknown "
1803                                        "status: rc = %d\n",
1804                                        lfsck_lfsck2name(lfsck),
1805                                        lfsck->li_status);
1806                                 lr->lr_status = LS_CO_FAILED;
1807                                 break;
1808                         }
1809                 }
1810         } else {
1811                 if (lfsck->li_flags & LPF_ALL_TGT) {
1812                         lr->lr_event = LE_STOP;
1813                         lr->lr_status = LS_FAILED;
1814                 } else {
1815                         lr->lr_event = LE_PEER_EXIT;
1816                         lr->lr_status = LS_CO_FAILED;
1817                 }
1818         }
1819
1820         rc1 = lfsck_assistant_notify_others(env, com, lr);
1821         if (rc1 != 0) {
1822                 CDEBUG(D_LFSCK, "%s: LFSCK assistant failed to notify "
1823                        "others for %s quit: rc = %d\n",
1824                        lfsck_lfsck2name(lfsck), lad->lad_name, rc1);
1825                 rc = rc1;
1826         }
1827
1828         CDEBUG(D_LFSCK, "%s: LFSCK assistant sync before exit\n",
1829                lfsck_lfsck2name(lfsck));
1830
1831         /* Flush async updates before exit. */
1832         rc2 = dt_sync(env, lfsck->li_next);
1833
1834         CDEBUG(D_LFSCK, "%s: LFSCK assistant synced before exit: rc = %d\n",
1835                lfsck_lfsck2name(lfsck), rc2);
1836
1837         /* Under force exit case, some requests may be just freed without
1838          * verification, those objects should be re-handled when next run.
1839          * So not update the on-disk trace file under such case. */
1840         if (test_bit(LAD_IN_DOUBLE_SCAN, &lad->lad_flags)) {
1841                 if (!test_bit(LAD_EXIT, &lad->lad_flags))
1842                         rc1 = lao->la_double_scan_result(env, com, rc);
1843
1844                 CDEBUG(D_LFSCK, "%s: LFSCK assistant phase2 scan "
1845                        "finished: rc = %d\n",
1846                        lfsck_lfsck2name(lfsck), rc1 != 0 ? rc1 : rc);
1847         }
1848
1849 fini:
1850         if (test_bit(LAD_IN_DOUBLE_SCAN, &lad->lad_flags))
1851                 atomic_dec(&lfsck->li_double_scan_count);
1852
1853         spin_lock(&lad->lad_lock);
1854         lad->lad_assistant_status = (rc1 != 0 ? rc1 : rc);
1855         thread_set_flags(athread, SVC_STOPPED);
1856         lad->lad_task = NULL;
1857         spin_unlock(&lad->lad_lock);
1858
1859         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread exit: rc = %d\n",
1860                lfsck_lfsck2name(lfsck), lad->lad_name,
1861                lad->lad_assistant_status);
1862
1863         lfsck_thread_args_fini(lta);
1864         wake_up_all(&mthread->t_ctl_waitq);
1865
1866         return rc;
1867 }