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         int                     rc  = 0;
 638         int                     rc1 = 0;
 639
 640         list_for_each_entry(com, &lfsck->li_list_double_scan, lc_link) {
 641                 rc = com->lc_ops->lfsck_double_scan(env, com);
 642                 if (rc != 0)
 643                         rc1 = rc;
 644         }
 645
 646         wait_event_idle(lfsck->li_thread.t_ctl_waitq,
 647                         atomic_read(&lfsck->li_double_scan_count) == 0);
 648
 649         if (lfsck->li_status != LS_PAUSED &&
 650             lfsck->li_status != LS_CO_PAUSED) {
 651                 list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
 652                                          lc_link) {
 653                         spin_lock(&lfsck->li_lock);
 654                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 655                         spin_unlock(&lfsck->li_lock);
 656                 }
 657         }
 658
 659         return rc1 != 0 ? rc1 : rc;
 660 }
 661
 662 static void lfsck_quit(const struct lu_env *env, struct lfsck_instance *lfsck)
 663 {
 664         struct lfsck_component *com;
 665         struct lfsck_component *next;
 666
 667         list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
 668                                  lc_link) {
 669                 if (com->lc_ops->lfsck_quit != NULL)
 670                         com->lc_ops->lfsck_quit(env, com);
 671
 672                 spin_lock(&lfsck->li_lock);
 673                 list_del_init(&com->lc_link_dir);
 674                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 675                 spin_unlock(&lfsck->li_lock);
 676         }
 677
 678         list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
 679                                  lc_link) {
 680                 if (com->lc_ops->lfsck_quit != NULL)
 681                         com->lc_ops->lfsck_quit(env, com);
 682
 683                 spin_lock(&lfsck->li_lock);
 684                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 685                 spin_unlock(&lfsck->li_lock);
 686         }
 687 }
 688
 689 /* LFSCK engines */
 690
 691 static int lfsck_master_dir_engine(const struct lu_env *env,
 692                                    struct lfsck_instance *lfsck)
 693 {
 694         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 695         struct dt_object                *dir    = lfsck->li_obj_dir;
 696         const struct dt_it_ops          *iops   = &dir->do_index_ops->dio_it;
 697         struct dt_it                    *di     = lfsck->li_di_dir;
 698         struct lu_dirent                *ent    =
 699                         (struct lu_dirent *)info->lti_key;
 700         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
 701         struct ptlrpc_thread            *thread = &lfsck->li_thread;
 702         struct lfsck_assistant_object   *lso    = NULL;
 703         int                              rc;
 704         __u16                            type;
 705         ENTRY;
 706
 707         do {
 708                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY2, cfs_fail_val) &&
 709                     unlikely(!thread_is_running(thread))) {
 710                         CDEBUG(D_LFSCK, "%s: scan dir exit for engine stop, "
 711                                "parent "DFID", cookie %#llx\n",
 712                                lfsck_lfsck2name(lfsck),
 713                                PFID(lfsck_dto2fid(dir)), lfsck->li_cookie_dir);
 714
 715                         GOTO(out, rc = 0);
 716                 }
 717
 718                 lfsck->li_new_scanned++;
 719                 rc = iops->rec(env, di, (struct dt_rec *)ent,
 720                                lfsck->li_args_dir);
 721                 if (rc == 0)
 722                         rc = lfsck_unpack_ent(ent, &lfsck->li_cookie_dir,
 723                                               &type);
 724
 725                 if (rc != 0) {
 726                         CDEBUG(D_LFSCK, "%s: scan dir failed at rec(), "
 727                                "parent "DFID", cookie %#llx: rc = %d\n",
 728                                lfsck_lfsck2name(lfsck),
 729                                PFID(lfsck_dto2fid(dir)),
 730                                lfsck->li_cookie_dir, rc);
 731                         lfsck_fail(env, lfsck, true);
 732                         if (bk->lb_param & LPF_FAILOUT)
 733                                 GOTO(out, rc);
 734                         else
 735                                 goto checkpoint;
 736                 }
 737
 738                 if (ent->lde_attrs & LUDA_IGNORE)
 739                         goto checkpoint;
 740
 741                 /* skip dot entry. */
 742                 if (ent->lde_namelen == 1 && ent->lde_name[0] == '.')
 743                         goto checkpoint;
 744
 745                 if (lso == NULL) {
 746                         lso = lfsck_assistant_object_init(env,
 747                                 lfsck_dto2fid(dir), NULL,
 748                                 lfsck->li_pos_current.lp_oit_cookie, true);
 749                         if (IS_ERR(lso)) {
 750                                 if (bk->lb_param & LPF_FAILOUT)
 751                                         RETURN(PTR_ERR(lso));
 752
 753                                 lso = NULL;
 754                                 goto checkpoint;
 755                         }
 756                 }
 757
 758                 /* The type in the @ent structure may has been overwritten,
 759                  * so we need to pass the @type parameter independently. */
 760                 rc = lfsck_exec_dir(env, lfsck, lso, ent, type);
 761                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 762                         GOTO(out, rc);
 763
 764 checkpoint:
 765                 rc = lfsck_checkpoint(env, lfsck);
 766                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 767                         GOTO(out, rc);
 768
 769                 /* Rate control. */
 770                 lfsck_control_speed(lfsck);
 771                 if (unlikely(!thread_is_running(thread))) {
 772                         CDEBUG(D_LFSCK, "%s: scan dir exit for engine stop, "
 773                                "parent "DFID", cookie %#llx\n",
 774                                lfsck_lfsck2name(lfsck),
 775                                PFID(lfsck_dto2fid(dir)),
 776                                lfsck->li_cookie_dir);
 777                         GOTO(out, rc = 0);
 778                 }
 779
 780                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL2)) {
 781                         spin_lock(&lfsck->li_lock);
 782                         thread_set_flags(thread, SVC_STOPPING);
 783                         spin_unlock(&lfsck->li_lock);
 784                         GOTO(out, rc = -EINVAL);
 785                 }
 786
 787                 rc = iops->next(env, di);
 788                 if (rc < 0)
 789                         CDEBUG(D_LFSCK, "%s dir engine fail to locate next "
 790                                "for the directory "DFID": rc = %d\n",
 791                                lfsck_lfsck2name(lfsck),
 792                                PFID(&lfsck->li_pos_current.lp_dir_parent), rc);
 793         } while (rc == 0);
 794
 795         if (rc > 0 && !lfsck->li_oit_over)
 796                 lfsck_close_dir(env, lfsck, rc);
 797
 798         GOTO(out, rc);
 799
 800 out:
 801         if (lso != NULL)
 802                 lfsck_assistant_object_put(env, lso);
 803
 804         return rc;
 805 }
 806
 807 /**
 808  * Object-table based iteration engine.
 809  *
 810  * Object-table based iteration is the basic linear engine to scan all the
 811  * objects on current device in turn. For each object, it calls all the
 812  * registered LFSCK component(s)' API to perform related consistency
 813  * verification.
 814  *
 815  * It flushes related LFSCK trace files to disk via making checkpoint
 816  * periodically. Then if the server crashed or the LFSCK is paused, the
 817  * LFSCK can resume from the latest checkpoint.
 818  *
 819  * It also controls the whole LFSCK speed via lfsck_control_speed() to
 820  * avoid the server to become overload.
 821  *
 822  * \param[in] env       pointer to the thread context
 823  * \param[in] lfsck     pointer to the lfsck instance
 824  *
 825  * \retval              positive number if all objects have been scanned
 826  * \retval              0 if the iteration is stopped or paused
 827  * \retval              negative error number on failure
 828  */
 829 static int lfsck_master_oit_engine(const struct lu_env *env,
 830                                    struct lfsck_instance *lfsck)
 831 {
 832         struct lfsck_thread_info *info  = lfsck_env_info(env);
 833         const struct dt_it_ops   *iops  =
 834                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
 835         struct dt_it             *di    = lfsck->li_di_oit;
 836         struct lu_fid            *fid   = &info->lti_fid;
 837         struct lfsck_bookmark    *bk    = &lfsck->li_bookmark_ram;
 838         struct ptlrpc_thread     *thread = &lfsck->li_thread;
 839         struct seq_server_site   *ss    = lfsck_dev_site(lfsck);
 840         __u32                    idx    = lfsck_dev_idx(lfsck);
 841         int                      rc;
 842         ENTRY;
 843
 844         if (unlikely(ss == NULL))
 845                 RETURN(-EIO);
 846
 847         do {
 848                 struct dt_object *target;
 849
 850                 if (lfsck->li_di_dir != NULL) {
 851                         rc = lfsck_master_dir_engine(env, lfsck);
 852                         if (rc <= 0)
 853                                 RETURN(rc);
 854                 }
 855
 856                 if (unlikely(lfsck->li_oit_over))
 857                         RETURN(1);
 858
 859                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY1, cfs_fail_val) &&
 860                     unlikely(!thread_is_running(thread))) {
 861                         CDEBUG(D_LFSCK, "%s: OIT scan exit for engine stop, "
 862                                "cookie %llu\n",
 863                                lfsck_lfsck2name(lfsck), iops->store(env, di));
 864
 865                         RETURN(0);
 866                 }
 867
 868                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_CRASH))
 869                         RETURN(0);
 870
 871                 lfsck->li_current_oit_processed = 1;
 872
 873                 if (!list_empty(&lfsck->li_list_lmv)) {
 874                         struct lfsck_lmv_unit *llu;
 875
 876                         spin_lock(&lfsck->li_lock);
 877                         llu = list_entry(lfsck->li_list_lmv.next,
 878                                          struct lfsck_lmv_unit, llu_link);
 879                         list_del_init(&llu->llu_link);
 880                         spin_unlock(&lfsck->li_lock);
 881
 882                         lfsck->li_lmv = &llu->llu_lmv;
 883                         lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
 884                         rc = lfsck_open_dir(env, lfsck, 0);
 885                         if (rc == 0)
 886                                 rc = lfsck_master_dir_engine(env, lfsck);
 887
 888                         if (rc <= 0)
 889                                 RETURN(rc);
 890                 }
 891
 892                 lfsck->li_new_scanned++;
 893                 lfsck->li_pos_current.lp_oit_cookie = iops->store(env, di);
 894                 rc = iops->rec(env, di, (struct dt_rec *)fid, 0);
 895                 if (rc != 0) {
 896                         CDEBUG(D_LFSCK, "%s: OIT scan failed at rec(): "
 897                                "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 898                         lfsck_fail(env, lfsck, true);
 899                         if (rc < 0 && bk->lb_param & LPF_FAILOUT)
 900                                 RETURN(rc);
 901                         else
 902                                 goto checkpoint;
 903                 }
 904
 905                 if (unlikely(!fid_is_sane(fid))) {
 906                         CDEBUG(D_LFSCK, "%s: OIT scan find invalid FID "DFID
 907                                ", skip it\n",
 908                                lfsck_lfsck2name(lfsck), PFID(fid));
 909                         goto checkpoint;
 910                 }
 911
 912                 if (fid_is_idif(fid)) {
 913                         __u32 idx1 = fid_idif_ost_idx(fid);
 914
 915                         LASSERT(!lfsck->li_master);
 916
 917                         if (idx != idx1) {
 918                                 struct ost_id *oi = &info->lti_oi;
 919
 920                                 if (unlikely(idx1 != 0)) {
 921                                         CDEBUG(D_LFSCK, "%s: invalid IDIF "DFID
 922                                                ", not match device index %u\n",
 923                                                lfsck_lfsck2name(lfsck),
 924                                                PFID(fid), idx);
 925
 926                                         goto checkpoint;
 927                                 }
 928
 929                                 /* rebuild the IDIF with index to
 930                                  * avoid double instances for the
 931                                  * same object. */
 932                                 fid_to_ostid(fid, oi);
 933                                 ostid_to_fid(fid, oi, idx);
 934                         }
 935                 } else if (!fid_is_norm(fid) && !fid_is_igif(fid) &&
 936                            !fid_is_last_id(fid) &&
 937                            !lu_fid_eq(fid, &lfsck->li_global_root_fid)) {
 938
 939                         /* If the FID/object is only used locally and invisible
 940                          * to external nodes, then LFSCK will not handle it.
 941                          *
 942                          * dot_lustre sequence has been handled specially. */
 943                         goto checkpoint;
 944                 } else {
 945                         struct lu_seq_range *range = &info->lti_range;
 946
 947                         if (lfsck->li_master)
 948                                 fld_range_set_mdt(range);
 949                         else
 950                                 fld_range_set_ost(range);
 951                         rc = fld_local_lookup(env, ss->ss_server_fld,
 952                                               fid_seq(fid), range);
 953                         if (rc != 0 || range->lsr_index != idx) {
 954                                 /* Remote object will be handled by the LFSCK
 955                                  * instance on the MDT where the remote object
 956                                  * really resides on. */
 957                                 rc = 0;
 958                                 goto checkpoint;
 959                         }
 960                 }
 961
 962                 target = lfsck_object_find_bottom(env, lfsck, fid);
 963                 if (IS_ERR(target)) {
 964                         CDEBUG(D_LFSCK, "%s: OIT scan failed at find target "
 965                                DFID", cookie %llu: rc = %d\n",
 966                                lfsck_lfsck2name(lfsck), PFID(fid),
 967                                iops->store(env, di), rc);
 968                         lfsck_fail(env, lfsck, true);
 969                         if (bk->lb_param & LPF_FAILOUT)
 970                                 RETURN(PTR_ERR(target));
 971                         else
 972                                 goto checkpoint;
 973                 }
 974
 975                 if (dt_object_exists(target))
 976                         rc = lfsck_exec_oit(env, lfsck, target);
 977
 978                 lfsck_object_put(env, target);
 979                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 980                         RETURN(rc);
 981
 982 checkpoint:
 983                 rc = lfsck_checkpoint(env, lfsck);
 984                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 985                         RETURN(rc);
 986
 987                 /* Rate control. */
 988                 lfsck_control_speed(lfsck);
 989
 990                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL1)) {
 991                         spin_lock(&lfsck->li_lock);
 992                         thread_set_flags(thread, SVC_STOPPING);
 993                         spin_unlock(&lfsck->li_lock);
 994                         RETURN(-EINVAL);
 995                 }
 996
 997                 rc = iops->next(env, di);
 998                 if (unlikely(rc > 0))
 999                         lfsck->li_oit_over = 1;
1000                 else if (likely(rc == 0))
1001                         lfsck->li_current_oit_processed = 0;
1002                 else
1003                         CDEBUG(D_LFSCK, "%s oit engine fail to locate next at "
1004                                "%llu: rc = %d\n", lfsck_lfsck2name(lfsck),
1005                                iops->store(env, di), rc);
1006
1007                 if (unlikely(!thread_is_running(thread))) {
1008                         CDEBUG(D_LFSCK, "%s: OIT scan exit for engine stop, "
1009                                "cookie %llu\n", lfsck_lfsck2name(lfsck),
1010                                iops->store(env, di));
1011                         RETURN(0);
1012                 }
1013         } while (rc == 0 || lfsck->li_di_dir != NULL);
1014
1015         RETURN(rc);
1016 }
1017
1018 int lfsck_master_engine(void *args)
1019 {
1020         struct lfsck_thread_args *lta      = args;
1021         struct lu_env            *env      = &lta->lta_env;
1022         struct lfsck_instance    *lfsck    = lta->lta_lfsck;
1023         struct ptlrpc_thread     *thread   = &lfsck->li_thread;
1024         struct dt_object         *oit_obj  = lfsck->li_obj_oit;
1025         const struct dt_it_ops   *oit_iops = &oit_obj->do_index_ops->dio_it;
1026         struct dt_it             *oit_di;
1027         int                       rc;
1028         ENTRY;
1029
1030         spin_lock(&lfsck->li_lock);
1031         lfsck->li_task = current;
1032         spin_unlock(&lfsck->li_lock);
1033
1034         /* There will be some objects verification during the LFSCK start,
1035          * such as the subsequent lfsck_verify_lpf(). Trigger low layer OI
1036          * OI scrub before that to handle the potential inconsistence. */
1037         oit_di = oit_iops->init(env, oit_obj, lfsck->li_args_oit);
1038         if (IS_ERR(oit_di)) {
1039                 rc = PTR_ERR(oit_di);
1040                 CDEBUG(D_LFSCK, "%s: master engine fail to init iteration: "
1041                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
1042
1043                 GOTO(fini_args, rc);
1044         }
1045
1046         if (lfsck->li_master &&
1047             (!list_empty(&lfsck->li_list_scan) ||
1048              !list_empty(&lfsck->li_list_double_scan))) {
1049                 rc = lfsck_verify_lpf(env, lfsck);
1050                 /* Fail to verify the .lustre/lost+found/MDTxxxx/ may be not
1051                  * fatal, because the .lustre/lost+found/ maybe not accessed
1052                  * by the LFSCK if it does not add orphans or others to such
1053                  * directory. So go ahead until hit failure when really uses
1054                  * the directory. */
1055                 if (rc != 0)
1056                         CDEBUG(D_LFSCK, "%s: master engine fail to verify the "
1057                                ".lustre/lost+found/, go ahead: rc = %d\n",
1058                                lfsck_lfsck2name(lfsck), rc);
1059         }
1060
1061         spin_lock(&lfsck->li_lock);
1062         lfsck->li_di_oit = oit_di;
1063         spin_unlock(&lfsck->li_lock);
1064         rc = lfsck_prep(env, lfsck, lta->lta_lsp);
1065         if (rc != 0)
1066                 GOTO(fini_oit, rc);
1067
1068         CDEBUG(D_LFSCK, "LFSCK entry: oit_flags = %#x, dir_flags = %#x, "
1069                "oit_cookie = %llu, dir_cookie = %#llx, parent = "DFID
1070                ", pid = %d\n", lfsck->li_args_oit, lfsck->li_args_dir,
1071                lfsck->li_pos_checkpoint.lp_oit_cookie,
1072                lfsck->li_pos_checkpoint.lp_dir_cookie,
1073                PFID(&lfsck->li_pos_checkpoint.lp_dir_parent),
1074                current_pid());
1075
1076         spin_lock(&lfsck->li_lock);
1077         if (unlikely(!thread_is_starting(thread))) {
1078                 spin_unlock(&lfsck->li_lock);
1079                 GOTO(fini_oit, rc = 0);
1080         }
1081
1082         thread_set_flags(thread, SVC_RUNNING);
1083         spin_unlock(&lfsck->li_lock);
1084         wake_up_all(&thread->t_ctl_waitq);
1085
1086         wait_event_idle(thread->t_ctl_waitq,
1087                         lfsck->li_start_unplug ||
1088                         !thread_is_running(thread));
1089         if (!thread_is_running(thread))
1090                 GOTO(fini_oit, rc = 0);
1091
1092         if (!list_empty(&lfsck->li_list_scan) ||
1093             list_empty(&lfsck->li_list_double_scan))
1094                 rc = lfsck_master_oit_engine(env, lfsck);
1095         else
1096                 rc = 1;
1097
1098         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
1099         CDEBUG(D_LFSCK, "LFSCK exit: oit_flags = %#x, dir_flags = %#x, "
1100                "oit_cookie = %llu, dir_cookie = %#llx, parent = "DFID
1101                ", pid = %d, rc = %d\n", lfsck->li_args_oit, lfsck->li_args_dir,
1102                lfsck->li_pos_checkpoint.lp_oit_cookie,
1103                lfsck->li_pos_checkpoint.lp_dir_cookie,
1104                PFID(&lfsck->li_pos_checkpoint.lp_dir_parent),
1105                current_pid(), rc);
1106
1107         if (!OBD_FAIL_CHECK(OBD_FAIL_LFSCK_CRASH))
1108                 rc = lfsck_post(env, lfsck, rc);
1109         else
1110                 lfsck_close_dir(env, lfsck, rc);
1111
1112 fini_oit:
1113         lfsck_di_oit_put(env, lfsck);
1114         oit_iops->fini(env, oit_di);
1115         if (rc == 1) {
1116                 if (!list_empty(&lfsck->li_list_double_scan))
1117                         rc = lfsck_double_scan(env, lfsck);
1118                 else
1119                         rc = 0;
1120         } else {
1121                 lfsck_quit(env, lfsck);
1122         }
1123
1124         /* XXX: Purge the pinned objects in the future. */
1125
1126 fini_args:
1127         spin_lock(&lfsck->li_lock);
1128         thread_set_flags(thread, SVC_STOPPED);
1129         lfsck->li_task = NULL;
1130         spin_unlock(&lfsck->li_lock);
1131         wake_up_all(&thread->t_ctl_waitq);
1132         lfsck_thread_args_fini(lta);
1133         return rc;
1134 }
1135
1136 static inline bool lfsck_assistant_req_empty(struct lfsck_assistant_data *lad)
1137 {
1138         bool empty = false;
1139
1140         spin_lock(&lad->lad_lock);
1141         if (list_empty(&lad->lad_req_list))
1142                 empty = true;
1143         spin_unlock(&lad->lad_lock);
1144
1145         return empty;
1146 }
1147
1148 /**
1149  * Query the LFSCK status from the instatnces on remote servers.
1150  *
1151  * The LFSCK assistant thread queries the LFSCK instances on other
1152  * servers (MDT/OST) about their status, such as whether they have
1153  * finished the phase1/phase2 scanning or not, and so on.
1154  *
1155  * \param[in] env       pointer to the thread context
1156  * \param[in] com       pointer to the lfsck component
1157  *
1158  * \retval              0 for success
1159  * \retval              negative error number on failure
1160  */
1161 static int lfsck_assistant_query_others(const struct lu_env *env,
1162                                         struct lfsck_component *com)
1163 {
1164         struct lfsck_thread_info          *info  = lfsck_env_info(env);
1165         struct lfsck_request              *lr    = &info->lti_lr;
1166         struct lfsck_async_interpret_args *laia  = &info->lti_laia;
1167         struct lfsck_instance             *lfsck = com->lc_lfsck;
1168         struct lfsck_assistant_data       *lad   = com->lc_data;
1169         struct ptlrpc_request_set         *set;
1170         struct lfsck_tgt_descs            *ltds;
1171         struct lfsck_tgt_desc             *ltd;
1172         struct list_head                  *phase_head;
1173         int                                rc    = 0;
1174         int                                rc1   = 0;
1175         ENTRY;
1176
1177         set = ptlrpc_prep_set();
1178         if (set == NULL)
1179                 RETURN(-ENOMEM);
1180
1181         lad->lad_touch_gen++;
1182         memset(lr, 0, sizeof(*lr));
1183         lr->lr_event = LE_QUERY;
1184         lr->lr_active = com->lc_type;
1185
1186         memset(laia, 0, sizeof(*laia));
1187         laia->laia_com = com;
1188         laia->laia_lr = lr;
1189
1190         if (!list_empty(&lad->lad_mdt_phase1_list)) {
1191                 ltds = &lfsck->li_mdt_descs;
1192                 lr->lr_flags = 0;
1193                 phase_head = &lad->lad_mdt_phase1_list;
1194         } else if (com->lc_type != LFSCK_TYPE_LAYOUT) {
1195                 goto out;
1196         } else {
1197
1198 again:
1199                 ltds = &lfsck->li_ost_descs;
1200                 lr->lr_flags = LEF_TO_OST;
1201                 phase_head = &lad->lad_ost_phase1_list;
1202         }
1203
1204         laia->laia_ltds = ltds;
1205         spin_lock(&ltds->ltd_lock);
1206         while (!list_empty(phase_head)) {
1207                 struct list_head *phase_list;
1208                 __u32            *gen;
1209
1210                 if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1211                         ltd = list_entry(phase_head->next,
1212                                          struct lfsck_tgt_desc,
1213                                          ltd_layout_phase_list);
1214                         phase_list = &ltd->ltd_layout_phase_list;
1215                         gen = &ltd->ltd_layout_gen;
1216                 } else {
1217                         ltd = list_entry(phase_head->next,
1218                                          struct lfsck_tgt_desc,
1219                                          ltd_namespace_phase_list);
1220                         phase_list = &ltd->ltd_namespace_phase_list;
1221                         gen = &ltd->ltd_namespace_gen;
1222                 }
1223
1224                 if (*gen == lad->lad_touch_gen)
1225                         break;
1226
1227                 *gen = lad->lad_touch_gen;
1228                 list_move_tail(phase_list, phase_head);
1229                 atomic_inc(&ltd->ltd_ref);
1230                 laia->laia_ltd = ltd;
1231                 spin_unlock(&ltds->ltd_lock);
1232                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1233                                          lfsck_async_interpret_common,
1234                                          laia, LFSCK_QUERY);
1235                 if (rc != 0) {
1236                         CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to query "
1237                                "%s %x for %s: rc = %d\n",
1238                                lfsck_lfsck2name(lfsck),
1239                                (lr->lr_flags & LEF_TO_OST) ? "OST" : "MDT",
1240                                ltd->ltd_index, lad->lad_name, rc);
1241                         lfsck_tgt_put(ltd);
1242                         rc1 = rc;
1243                 }
1244                 spin_lock(&ltds->ltd_lock);
1245         }
1246         spin_unlock(&ltds->ltd_lock);
1247
1248         rc = ptlrpc_set_wait(env, set);
1249         if (rc < 0) {
1250                 ptlrpc_set_destroy(set);
1251                 RETURN(rc);
1252         }
1253
1254         if (com->lc_type == LFSCK_TYPE_LAYOUT && !(lr->lr_flags & LEF_TO_OST) &&
1255             list_empty(&lad->lad_mdt_phase1_list))
1256                 goto again;
1257
1258 out:
1259         ptlrpc_set_destroy(set);
1260
1261         RETURN(rc1 != 0 ? rc1 : rc);
1262 }
1263
1264 /**
1265  * Notify the LFSCK event to the instances on remote servers.
1266  *
1267  * The LFSCK assistant thread notifies the LFSCK instances on other
1268  * servers (MDT/OST) about some events, such as start new scanning,
1269  * stop the scanning, this LFSCK instance will exit, and so on.
1270  *
1271  * \param[in] env       pointer to the thread context
1272  * \param[in] com       pointer to the lfsck component
1273  * \param[in] lr        pointer to the LFSCK event request
1274  *
1275  * \retval              0 for success
1276  * \retval              negative error number on failure
1277  */
1278 static int lfsck_assistant_notify_others(const struct lu_env *env,
1279                                          struct lfsck_component *com,
1280                                          struct lfsck_request *lr)
1281 {
1282         struct lfsck_thread_info          *info  = lfsck_env_info(env);
1283         struct lfsck_async_interpret_args *laia  = &info->lti_laia;
1284         struct lfsck_instance             *lfsck = com->lc_lfsck;
1285         struct lfsck_assistant_data       *lad   = com->lc_data;
1286         struct lfsck_bookmark             *bk    = &lfsck->li_bookmark_ram;
1287         struct ptlrpc_request_set         *set;
1288         struct lfsck_tgt_descs            *ltds;
1289         struct lfsck_tgt_desc             *ltd;
1290         struct lfsck_tgt_desc             *next;
1291         __u32                              idx;
1292         int                                rc    = 0;
1293         int                                rc1   = 0;
1294         ENTRY;
1295
1296         set = ptlrpc_prep_set();
1297         if (set == NULL)
1298                 RETURN(-ENOMEM);
1299
1300         lr->lr_index = lfsck_dev_idx(lfsck);
1301         lr->lr_active = com->lc_type;
1302
1303         memset(laia, 0, sizeof(*laia));
1304         laia->laia_com = com;
1305         laia->laia_lr = lr;
1306
1307         switch (lr->lr_event) {
1308         case LE_START:
1309                 if (com->lc_type != LFSCK_TYPE_LAYOUT)
1310                         goto next;
1311
1312                 lr->lr_valid = LSV_SPEED_LIMIT | LSV_ERROR_HANDLE | LSV_DRYRUN;
1313                 lr->lr_speed = bk->lb_speed_limit;
1314                 lr->lr_version = bk->lb_version;
1315                 lr->lr_param |= bk->lb_param;
1316                 lr->lr_async_windows = bk->lb_async_windows;
1317                 lr->lr_flags = LEF_TO_OST;
1318
1319                 /* Notify OSTs firstly, then handle other MDTs if needed. */
1320                 ltds = &lfsck->li_ost_descs;
1321                 laia->laia_ltds = ltds;
1322                 down_read(&ltds->ltd_rw_sem);
1323                 cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1324                         ltd = lfsck_tgt_get(ltds, idx);
1325                         LASSERT(ltd != NULL);
1326
1327                         laia->laia_ltd = ltd;
1328                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1329                                         lfsck_async_interpret_common,
1330                                         laia, LFSCK_NOTIFY);
1331                         if (rc != 0) {
1332                                 lfsck_lad_set_bitmap(env, com, idx);
1333                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
1334                                        "notify OST %x for %s start: rc = %d\n",
1335                                        lfsck_lfsck2name(lfsck), idx,
1336                                        lad->lad_name, rc);
1337                                 lfsck_tgt_put(ltd);
1338                         }
1339                 }
1340                 up_read(&ltds->ltd_rw_sem);
1341
1342                 /* Sync up */
1343                 rc = ptlrpc_set_wait(env, set);
1344                 if (rc < 0) {
1345                         ptlrpc_set_destroy(set);
1346                         RETURN(rc);
1347                 }
1348
1349 next:
1350                 if (!(bk->lb_param & LPF_ALL_TGT))
1351                         break;
1352
1353                 /* link other MDT targets locallly. */
1354                 ltds = &lfsck->li_mdt_descs;
1355                 spin_lock(&ltds->ltd_lock);
1356                 if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1357                         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1358                                 ltd = lfsck_ltd2tgt(ltds, idx);
1359                                 LASSERT(ltd != NULL);
1360
1361                                 if (!list_empty(&ltd->ltd_layout_list))
1362                                         continue;
1363
1364                                 list_add_tail(&ltd->ltd_layout_list,
1365                                               &lad->lad_mdt_list);
1366                                 list_add_tail(&ltd->ltd_layout_phase_list,
1367                                               &lad->lad_mdt_phase1_list);
1368                         }
1369                 } else {
1370                         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1371                                 ltd = lfsck_ltd2tgt(ltds, idx);
1372                                 LASSERT(ltd != NULL);
1373
1374                                 if (!list_empty(&ltd->ltd_namespace_list))
1375                                         continue;
1376
1377                                 list_add_tail(&ltd->ltd_namespace_list,
1378                                               &lad->lad_mdt_list);
1379                                 list_add_tail(&ltd->ltd_namespace_phase_list,
1380                                               &lad->lad_mdt_phase1_list);
1381                         }
1382                 }
1383                 spin_unlock(&ltds->ltd_lock);
1384                 break;
1385         case LE_STOP:
1386         case LE_PHASE2_DONE:
1387         case LE_PEER_EXIT: {
1388                 struct list_head *phase_head;
1389
1390                 /* Handle other MDTs firstly if needed, then notify the OSTs. */
1391                 if (bk->lb_param & LPF_ALL_TGT) {
1392                         phase_head = &lad->lad_mdt_list;
1393                         ltds = &lfsck->li_mdt_descs;
1394                         if (lr->lr_event == LE_STOP) {
1395                                 /* unlink other MDT targets locallly. */
1396                                 spin_lock(&ltds->ltd_lock);
1397                                 if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1398                                         list_for_each_entry_safe(ltd, next,
1399                                                 phase_head, ltd_layout_list) {
1400                                                 list_del_init(
1401                                                 &ltd->ltd_layout_phase_list);
1402                                                 list_del_init(
1403                                                 &ltd->ltd_layout_list);
1404                                         }
1405                                 } else {
1406                                         list_for_each_entry_safe(ltd, next,
1407                                                         phase_head,
1408                                                         ltd_namespace_list) {
1409                                                 list_del_init(
1410                                                 &ltd->ltd_namespace_phase_list);
1411                                                 list_del_init(
1412                                                 &ltd->ltd_namespace_list);
1413                                         }
1414                                 }
1415                                 spin_unlock(&ltds->ltd_lock);
1416
1417                                 if (com->lc_type != LFSCK_TYPE_LAYOUT)
1418                                         break;
1419
1420                                 lr->lr_flags |= LEF_TO_OST;
1421                                 phase_head = &lad->lad_ost_list;
1422                                 ltds = &lfsck->li_ost_descs;
1423                         } else {
1424                                 lr->lr_flags &= ~LEF_TO_OST;
1425                         }
1426                 } else if (com->lc_type != LFSCK_TYPE_LAYOUT) {
1427                         break;
1428                 } else {
1429                         lr->lr_flags |= LEF_TO_OST;
1430                         phase_head = &lad->lad_ost_list;
1431                         ltds = &lfsck->li_ost_descs;
1432                 }
1433
1434 again:
1435                 laia->laia_ltds = ltds;
1436                 spin_lock(&ltds->ltd_lock);
1437                 while (!list_empty(phase_head)) {
1438                         if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1439                                 ltd = list_entry(phase_head->next,
1440                                                  struct lfsck_tgt_desc,
1441                                                  ltd_layout_list);
1442                                 if (!list_empty(&ltd->ltd_layout_phase_list))
1443                                         list_del_init(
1444                                                 &ltd->ltd_layout_phase_list);
1445                                 list_del_init(&ltd->ltd_layout_list);
1446                         } else {
1447                                 ltd = list_entry(phase_head->next,
1448                                                  struct lfsck_tgt_desc,
1449                                                  ltd_namespace_list);
1450                                 if (!list_empty(&ltd->ltd_namespace_phase_list))
1451                                         list_del_init(
1452                                                 &ltd->ltd_namespace_phase_list);
1453                                 list_del_init(&ltd->ltd_namespace_list);
1454                         }
1455                         atomic_inc(&ltd->ltd_ref);
1456                         laia->laia_ltd = ltd;
1457                         spin_unlock(&ltds->ltd_lock);
1458                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1459                                         lfsck_async_interpret_common,
1460                                         laia, LFSCK_NOTIFY);
1461                         if (rc != 0) {
1462                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
1463                                        "notify %s %x for %s stop/phase2_done/"
1464                                        "peer_exit: rc = %d\n",
1465                                        lfsck_lfsck2name(lfsck),
1466                                        (lr->lr_flags & LEF_TO_OST) ?
1467                                        "OST" : "MDT", ltd->ltd_index,
1468                                        lad->lad_name, rc);
1469                                 lfsck_tgt_put(ltd);
1470                         }
1471                         spin_lock(&ltds->ltd_lock);
1472                 }
1473                 spin_unlock(&ltds->ltd_lock);
1474
1475                 rc = ptlrpc_set_wait(env, set);
1476                 if (rc < 0) {
1477                         ptlrpc_set_destroy(set);
1478                         RETURN(rc);
1479                 }
1480
1481                 if (com->lc_type == LFSCK_TYPE_LAYOUT &&
1482                     !(lr->lr_flags & LEF_TO_OST)) {
1483                         lr->lr_flags |= LEF_TO_OST;
1484                         phase_head = &lad->lad_ost_list;
1485                         ltds = &lfsck->li_ost_descs;
1486                         goto again;
1487                 }
1488                 break;
1489         }
1490         case LE_PHASE1_DONE:
1491                 lad->lad_ops->la_sync_failures(env, com, lr);
1492                 lad->lad_touch_gen++;
1493                 ltds = &lfsck->li_mdt_descs;
1494                 laia->laia_ltds = ltds;
1495                 spin_lock(&ltds->ltd_lock);
1496                 while (!list_empty(&lad->lad_mdt_list)) {
1497                         struct list_head *list;
1498                         __u32            *gen;
1499
1500                         if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1501                                 ltd = list_entry(lad->lad_mdt_list.next,
1502                                                  struct lfsck_tgt_desc,
1503                                                  ltd_layout_list);
1504                                 list = &ltd->ltd_layout_list;
1505                                 gen = &ltd->ltd_layout_gen;
1506                         } else {
1507                                 struct lfsck_namespace *ns = com->lc_file_ram;
1508
1509                                 ltd = list_entry(lad->lad_mdt_list.next,
1510                                                  struct lfsck_tgt_desc,
1511                                                  ltd_namespace_list);
1512                                 list = &ltd->ltd_namespace_list;
1513                                 gen = &ltd->ltd_namespace_gen;
1514                                 lr->lr_flags2 = ns->ln_flags & ~LF_INCOMPLETE;
1515                         }
1516
1517                         if (*gen == lad->lad_touch_gen)
1518                                 break;
1519
1520                         *gen = lad->lad_touch_gen;
1521                         list_move_tail(list, &lad->lad_mdt_list);
1522                         if (ltd->ltd_synced_failures)
1523                                 continue;
1524
1525                         atomic_inc(&ltd->ltd_ref);
1526                         laia->laia_ltd = ltd;
1527                         spin_unlock(&ltds->ltd_lock);
1528                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1529                                         lfsck_async_interpret_common,
1530                                         laia, LFSCK_NOTIFY);
1531                         if (rc != 0) {
1532                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
1533                                        "notify MDT %x for %s phase1 done: "
1534                                        "rc = %d\n", lfsck_lfsck2name(lfsck),
1535                                        ltd->ltd_index, lad->lad_name, rc);
1536                                 lfsck_tgt_put(ltd);
1537                         }
1538                         spin_lock(&ltds->ltd_lock);
1539                 }
1540                 spin_unlock(&ltds->ltd_lock);
1541                 break;
1542         default:
1543                 CDEBUG(D_LFSCK, "%s: LFSCK assistant unexpected LFSCK event: "
1544                        "rc = %d\n", lfsck_lfsck2name(lfsck), lr->lr_event);
1545                 rc = -EINVAL;
1546                 break;
1547         }
1548
1549         rc1 = ptlrpc_set_wait(env, set);
1550         ptlrpc_set_destroy(set);
1551
1552         RETURN(rc != 0 ? rc : rc1);
1553 }
1554
1555 /**
1556  * The LFSCK assistant thread is triggered by the LFSCK main engine.
1557  * They co-work together as an asynchronous pipeline: the LFSCK main
1558  * engine scans the system and pre-fetches the objects, attributes,
1559  * or name entries, etc, and pushes them into the pipeline as input
1560  * requests for the LFSCK assistant thread; on the other end of the
1561  * pipeline, the LFSCK assistant thread performs the real check and
1562  * repair for every request from the main engine.
1563  *
1564  * Generally, the assistant engine may be blocked when check/repair
1565  * something, so the LFSCK main engine will run some faster. On the
1566  * other hand, the LFSCK main engine will drive multiple assistant
1567  * threads in parallel, means for each LFSCK component on the master
1568  * (such as layout LFSCK, namespace LFSCK), there is an independent
1569  * LFSCK assistant thread. So under such 1:N multiple asynchronous
1570  * pipelines mode, the whole LFSCK performance will be much better
1571  * than check/repair everything by the LFSCK main engine itself.
1572  */
1573 int lfsck_assistant_engine(void *args)
1574 {
1575         struct lfsck_thread_args          *lta     = args;
1576         struct lu_env                     *env     = &lta->lta_env;
1577         struct lfsck_component            *com     = lta->lta_com;
1578         struct lfsck_instance             *lfsck   = lta->lta_lfsck;
1579         struct lfsck_bookmark             *bk      = &lfsck->li_bookmark_ram;
1580         struct lfsck_position             *pos     = &com->lc_pos_start;
1581         struct lfsck_thread_info          *info    = lfsck_env_info(env);
1582         struct lfsck_request              *lr      = &info->lti_lr;
1583         struct lfsck_assistant_data       *lad     = com->lc_data;
1584         struct ptlrpc_thread              *mthread = &lfsck->li_thread;
1585         struct ptlrpc_thread              *athread = &lad->lad_thread;
1586         struct lfsck_assistant_operations *lao     = lad->lad_ops;
1587         struct lfsck_assistant_req        *lar;
1588         struct l_wait_info                 lwi     = { 0 };
1589         int                                rc      = 0;
1590         int                                rc1     = 0;
1591         int                                rc2;
1592         ENTRY;
1593
1594         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread start\n",
1595                lfsck_lfsck2name(lfsck), lad->lad_name);
1596
1597         memset(lr, 0, sizeof(*lr));
1598         lr->lr_event = LE_START;
1599         if (pos->lp_oit_cookie <= 1)
1600                 lr->lr_param = LPF_RESET;
1601         rc = lfsck_assistant_notify_others(env, com, lr);
1602         if (rc != 0) {
1603                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to notify others "
1604                        "to start %s: rc = %d\n",
1605                        lfsck_lfsck2name(lfsck), lad->lad_name, rc);
1606                 GOTO(fini, rc);
1607         }
1608
1609         spin_lock(&lad->lad_lock);
1610         lad->lad_task = current;
1611         thread_set_flags(athread, SVC_RUNNING);
1612         spin_unlock(&lad->lad_lock);
1613         wake_up_all(&mthread->t_ctl_waitq);
1614
1615         while (1) {
1616                 while (!list_empty(&lad->lad_req_list)) {
1617                         bool wakeup = false;
1618
1619                         if (unlikely(test_bit(LAD_EXIT, &lad->lad_flags) ||
1620                                      !thread_is_running(mthread)))
1621                                 GOTO(cleanup, rc = lad->lad_post_result);
1622
1623                         lar = list_entry(lad->lad_req_list.next,
1624                                          struct lfsck_assistant_req,
1625                                          lar_list);
1626                         /* Only the lfsck_assistant_engine thread itself can
1627                          * remove the "lar" from the head of the list, LFSCK
1628                          * engine thread only inserts other new "lar" at the
1629                          * end of the list. So it is safe to handle current
1630                          * "lar" without the spin_lock. */
1631                         rc = lao->la_handler_p1(env, com, lar);
1632                         spin_lock(&lad->lad_lock);
1633                         list_del_init(&lar->lar_list);
1634                         lad->lad_prefetched--;
1635                         /* Wake up the main engine thread only when the list
1636                          * is empty or half of the prefetched items have been
1637                          * handled to avoid too frequent thread schedule. */
1638                         if (lad->lad_prefetched <= (bk->lb_async_windows / 2))
1639                                 wakeup = true;
1640                         spin_unlock(&lad->lad_lock);
1641                         if (wakeup)
1642                                 wake_up_all(&mthread->t_ctl_waitq);
1643
1644                         lao->la_req_fini(env, lar);
1645                         if (rc < 0 && bk->lb_param & LPF_FAILOUT)
1646                                 GOTO(cleanup, rc);
1647                 }
1648
1649                 l_wait_event(athread->t_ctl_waitq,
1650                              !lfsck_assistant_req_empty(lad) ||
1651                              test_bit(LAD_EXIT, &lad->lad_flags) ||
1652                              test_bit(LAD_TO_POST, &lad->lad_flags) ||
1653                              test_bit(LAD_TO_DOUBLE_SCAN, &lad->lad_flags),
1654                              &lwi);
1655
1656                 if (unlikely(test_bit(LAD_EXIT, &lad->lad_flags)))
1657                         GOTO(cleanup, rc = lad->lad_post_result);
1658
1659                 if (!list_empty(&lad->lad_req_list))
1660                         continue;
1661
1662                 if (test_bit(LAD_TO_POST, &lad->lad_flags)) {
1663                         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread post\n",
1664                                lfsck_lfsck2name(lfsck), lad->lad_name);
1665
1666                         if (unlikely(test_bit(LAD_EXIT, &lad->lad_flags)))
1667                                 GOTO(cleanup, rc = lad->lad_post_result);
1668
1669                         clear_bit(LAD_TO_POST, &lad->lad_flags);
1670                         LASSERT(lad->lad_post_result > 0);
1671
1672                         /* Wakeup the master engine to go ahead. */
1673                         wake_up_all(&mthread->t_ctl_waitq);
1674
1675                         memset(lr, 0, sizeof(*lr));
1676                         lr->lr_event = LE_PHASE1_DONE;
1677                         lr->lr_status = lad->lad_post_result;
1678                         rc = lfsck_assistant_notify_others(env, com, lr);
1679
1680                         CDEBUG(D_LFSCK, "%s: LFSCK assistant notified "
1681                                "others for %s post: rc = %d\n",
1682                                lfsck_lfsck2name(lfsck),
1683                                lad->lad_name, rc);
1684                 }
1685
1686                 if (test_bit(LAD_TO_DOUBLE_SCAN, &lad->lad_flags)) {
1687                         clear_bit(LAD_TO_DOUBLE_SCAN, &lad->lad_flags);
1688                         atomic_inc(&lfsck->li_double_scan_count);
1689                         set_bit(LAD_IN_DOUBLE_SCAN, &lad->lad_flags);
1690                         wake_up_all(&mthread->t_ctl_waitq);
1691
1692                         com->lc_new_checked = 0;
1693                         com->lc_new_scanned = 0;
1694                         com->lc_time_last_checkpoint = ktime_get_seconds();
1695                         com->lc_time_next_checkpoint =
1696                                 com->lc_time_last_checkpoint +
1697                                 LFSCK_CHECKPOINT_INTERVAL;
1698
1699                         CDEBUG(D_LFSCK, "%s: LFSCK assistant sync before "
1700                                "the second-stage scaning\n",
1701                                lfsck_lfsck2name(lfsck));
1702
1703                         /* Flush async updates before handling orphan. */
1704                         rc2 = dt_sync(env, lfsck->li_next);
1705
1706                         CDEBUG(D_LFSCK, "%s: LFSCK assistant phase2 "
1707                                "scan start, synced: rc = %d\n",
1708                                lfsck_lfsck2name(lfsck), rc2);
1709
1710                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_NO_DOUBLESCAN))
1711                                 GOTO(cleanup, rc = 0);
1712
1713                         while (test_bit(LAD_IN_DOUBLE_SCAN, &lad->lad_flags)) {
1714                                 rc = lfsck_assistant_query_others(env, com);
1715                                 if (lfsck_phase2_next_ready(lad))
1716                                         goto p2_next;
1717
1718                                 if (rc < 0)
1719                                         GOTO(cleanup, rc);
1720
1721                                 /* Pull LFSCK status on related targets once
1722                                  * per 30 seconds if we are not notified. */
1723                                 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(30),
1724                                                            cfs_time_seconds(1),
1725                                                            NULL, NULL);
1726                                 rc = l_wait_event(athread->t_ctl_waitq,
1727                                         lfsck_phase2_next_ready(lad) ||
1728                                         test_bit(LAD_EXIT, &lad->lad_flags) ||
1729                                         !thread_is_running(mthread),
1730                                         &lwi);
1731
1732                                 if (unlikely(
1733                                         test_bit(LAD_EXIT, &lad->lad_flags) ||
1734                                         !thread_is_running(mthread)))
1735                                         GOTO(cleanup, rc = 0);
1736
1737                                 if (rc == -ETIMEDOUT)
1738                                         continue;
1739
1740                                 if (rc < 0)
1741                                         GOTO(cleanup, rc);
1742
1743 p2_next:
1744                                 rc = lao->la_handler_p2(env, com);
1745                                 if (rc != 0)
1746                                         GOTO(cleanup, rc);
1747
1748                                 if (unlikely(
1749                                         test_bit(LAD_EXIT, &lad->lad_flags) ||
1750                                         !thread_is_running(mthread)))
1751                                         GOTO(cleanup, rc = 0);
1752                         }
1753                 }
1754         }
1755
1756 cleanup:
1757         /* Cleanup the unfinished requests. */
1758         spin_lock(&lad->lad_lock);
1759         if (rc < 0)
1760                 lad->lad_assistant_status = rc;
1761
1762         if (test_bit(LAD_EXIT, &lad->lad_flags) && lad->lad_post_result <= 0)
1763                 lao->la_fill_pos(env, com, &lfsck->li_pos_checkpoint);
1764
1765         thread_set_flags(athread, SVC_STOPPING);
1766         while (!list_empty(&lad->lad_req_list)) {
1767                 lar = list_entry(lad->lad_req_list.next,
1768                                  struct lfsck_assistant_req,
1769                                  lar_list);
1770                 list_del_init(&lar->lar_list);
1771                 lad->lad_prefetched--;
1772                 spin_unlock(&lad->lad_lock);
1773                 lao->la_req_fini(env, lar);
1774                 spin_lock(&lad->lad_lock);
1775         }
1776         spin_unlock(&lad->lad_lock);
1777
1778         memset(lr, 0, sizeof(*lr));
1779         if (rc > 0) {
1780                 lr->lr_event = LE_PHASE2_DONE;
1781                 lr->lr_status = rc;
1782         } else if (rc == 0) {
1783                 if (lfsck->li_flags & LPF_ALL_TGT) {
1784                         lr->lr_event = LE_STOP;
1785                         lr->lr_status = LS_STOPPED;
1786                 } else {
1787                         lr->lr_event = LE_PEER_EXIT;
1788                         switch (lfsck->li_status) {
1789                         case LS_PAUSED:
1790                         case LS_CO_PAUSED:
1791                                 lr->lr_status = LS_CO_PAUSED;
1792                                 break;
1793                         case LS_STOPPED:
1794                         case LS_CO_STOPPED:
1795                                 lr->lr_status = LS_CO_STOPPED;
1796                                 break;
1797                         default:
1798                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant unknown "
1799                                        "status: rc = %d\n",
1800                                        lfsck_lfsck2name(lfsck),
1801                                        lfsck->li_status);
1802                                 lr->lr_status = LS_CO_FAILED;
1803                                 break;
1804                         }
1805                 }
1806         } else {
1807                 if (lfsck->li_flags & LPF_ALL_TGT) {
1808                         lr->lr_event = LE_STOP;
1809                         lr->lr_status = LS_FAILED;
1810                 } else {
1811                         lr->lr_event = LE_PEER_EXIT;
1812                         lr->lr_status = LS_CO_FAILED;
1813                 }
1814         }
1815
1816         rc1 = lfsck_assistant_notify_others(env, com, lr);
1817         if (rc1 != 0) {
1818                 CDEBUG(D_LFSCK, "%s: LFSCK assistant failed to notify "
1819                        "others for %s quit: rc = %d\n",
1820                        lfsck_lfsck2name(lfsck), lad->lad_name, rc1);
1821                 rc = rc1;
1822         }
1823
1824         CDEBUG(D_LFSCK, "%s: LFSCK assistant sync before exit\n",
1825                lfsck_lfsck2name(lfsck));
1826
1827         /* Flush async updates before exit. */
1828         rc2 = dt_sync(env, lfsck->li_next);
1829
1830         CDEBUG(D_LFSCK, "%s: LFSCK assistant synced before exit: rc = %d\n",
1831                lfsck_lfsck2name(lfsck), rc2);
1832
1833         /* Under force exit case, some requests may be just freed without
1834          * verification, those objects should be re-handled when next run.
1835          * So not update the on-disk trace file under such case. */
1836         if (test_bit(LAD_IN_DOUBLE_SCAN, &lad->lad_flags)) {
1837                 if (!test_bit(LAD_EXIT, &lad->lad_flags))
1838                         rc1 = lao->la_double_scan_result(env, com, rc);
1839
1840                 CDEBUG(D_LFSCK, "%s: LFSCK assistant phase2 scan "
1841                        "finished: rc = %d\n",
1842                        lfsck_lfsck2name(lfsck), rc1 != 0 ? rc1 : rc);
1843         }
1844
1845 fini:
1846         if (test_bit(LAD_IN_DOUBLE_SCAN, &lad->lad_flags))
1847                 atomic_dec(&lfsck->li_double_scan_count);
1848
1849         spin_lock(&lad->lad_lock);
1850         lad->lad_assistant_status = (rc1 != 0 ? rc1 : rc);
1851         thread_set_flags(athread, SVC_STOPPED);
1852         lad->lad_task = NULL;
1853         spin_unlock(&lad->lad_lock);
1854
1855         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread exit: rc = %d\n",
1856                lfsck_lfsck2name(lfsck), lad->lad_name,
1857                lad->lad_assistant_status);
1858
1859         lfsck_thread_args_fini(lta);
1860         wake_up_all(&mthread->t_ctl_waitq);
1861
1862         return rc;
1863 }