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, 2014, 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_update_lma(const struct lu_env *env,
  97                             struct lfsck_instance *lfsck, struct dt_object *obj)
  98 {
  99         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 100         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
 101         struct dt_device                *dev    = lfsck_obj2dev(obj);
 102         struct lustre_mdt_attrs         *lma    = &info->lti_lma;
 103         struct lu_buf                   *buf;
 104         struct thandle                  *th;
 105         int                              fl;
 106         int                              rc;
 107         ENTRY;
 108
 109         if (bk->lb_param & LPF_DRYRUN)
 110                 RETURN(0);
 111
 112         buf = lfsck_buf_get(env, info->lti_lma_old, LMA_OLD_SIZE);
 113         rc = dt_xattr_get(env, obj, buf, XATTR_NAME_LMA, BYPASS_CAPA);
 114         if (rc < 0) {
 115                 if (rc != -ENODATA)
 116                         RETURN(rc);
 117
 118                 fl = LU_XATTR_CREATE;
 119                 lustre_lma_init(lma, lfsck_dto2fid(obj), LMAC_FID_ON_OST, 0);
 120         } else {
 121                 if (rc != LMA_OLD_SIZE && rc != sizeof(struct lustre_mdt_attrs))
 122                         RETURN(-EINVAL);
 123
 124                 fl = LU_XATTR_REPLACE;
 125                 lustre_lma_swab(lma);
 126                 lustre_lma_init(lma, lfsck_dto2fid(obj),
 127                                 lma->lma_compat | LMAC_FID_ON_OST,
 128                                 lma->lma_incompat);
 129         }
 130         lustre_lma_swab(lma);
 131
 132         th = dt_trans_create(env, dev);
 133         if (IS_ERR(th))
 134                 RETURN(PTR_ERR(th));
 135
 136         buf = lfsck_buf_get(env, lma, sizeof(*lma));
 137         rc = dt_declare_xattr_set(env, obj, buf, XATTR_NAME_LMA, fl, th);
 138         if (rc != 0)
 139                 GOTO(stop, rc);
 140
 141         rc = dt_trans_start_local(env, dev, th);
 142         if (rc != 0)
 143                 GOTO(stop, rc);
 144
 145         rc = dt_xattr_set(env, obj, buf, XATTR_NAME_LMA, fl, th, BYPASS_CAPA);
 146
 147         GOTO(stop, rc);
 148
 149 stop:
 150         dt_trans_stop(env, dev, th);
 151         return rc;
 152 }
 153
 154 static int lfsck_parent_fid(const struct lu_env *env, struct dt_object *obj,
 155                             struct lu_fid *fid)
 156 {
 157         if (unlikely(!S_ISDIR(lfsck_object_type(obj)) ||
 158                      !dt_try_as_dir(env, obj)))
 159                 return -ENOTDIR;
 160
 161         return dt_lookup(env, obj, (struct dt_rec *)fid,
 162                          (const struct dt_key *)"..", BYPASS_CAPA);
 163 }
 164
 165 /**
 166  * Check whether needs to scan the directory or not.
 167  *
 168  * 1) If we are not doing namespace LFSCK, or the given @obj is not directory,
 169  *    then needs not to scan the @obj. Otherwise,
 170  * 2) Global /ROOT needs to be scanned, backend root needs not to be scanned.
 171  * 3) If the @obj is neither IGIF nor normal FID (including .lustre and its
 172  *    sub-directories that have been scanned when the LFSCK engine start),
 173  *    then needs not to be scanned.
 174  * 4) If it is a remote object, then scanning the object will be done on the
 175  *    MDT on which the object really resides.
 176  * 5) If the local object has normal FID, then needs to be scanned. Otherwise,
 177  * 6) If the object has linkEA, then needs to be scanned. Otherwise,
 178  * 7) If none of the previous conditions are true, we need to check the parent
 179  *    directories whether this subdirectory is in a tree that should be scanned.
 180  *    Set the parent as current @obj, repeat 2)-7).
 181  *
 182  * \param[in] env       pointer to the thread context
 183  * \param[in] lfsck     pointer to the lfsck instance
 184  * \param[in] obj       pointer to the object to be checked
 185  *
 186  * \retval              positive number if the directory needs to be scanned
 187  * \retval              0 if the directory needs NOT to be scanned
 188  * \retval              negative error number on failure
 189  */
 190 static int lfsck_needs_scan_dir(const struct lu_env *env,
 191                                 struct lfsck_instance *lfsck,
 192                                 struct dt_object *obj)
 193 {
 194         struct lfsck_thread_info *info    = lfsck_env_info(env);
 195         struct lu_fid            *fid     = &info->lti_fid;
 196         struct lu_seq_range      *range   = &info->lti_range;
 197         struct seq_server_site   *ss      = lfsck_dev_site(lfsck);
 198         __u32                     idx     = lfsck_dev_idx(lfsck);
 199         int                       depth   = 0;
 200         int                       rc      = 0;
 201
 202         if (list_empty(&lfsck->li_list_dir) || !S_ISDIR(lfsck_object_type(obj)))
 203                 return 0;
 204
 205         LASSERT(ss != NULL);
 206
 207         *fid = *lfsck_dto2fid(obj);
 208         while (1) {
 209                 /* Global /ROOT is visible. */
 210                 if (unlikely(lu_fid_eq(fid, &lfsck->li_global_root_fid)))
 211                         return 1;
 212
 213                 /* Backend root is invisible. */
 214                 if (unlikely(lu_fid_eq(fid, &lfsck->li_local_root_fid)))
 215                         return 0;
 216
 217                 if (!fid_is_norm(fid) && !fid_is_igif(fid))
 218                         return 0;
 219
 220                 fld_range_set_mdt(range);
 221                 rc = fld_local_lookup(env, ss->ss_server_fld,
 222                                       fid_seq(fid), range);
 223                 if (rc != 0 || range->lsr_index != idx)
 224                         /* Current FID should NOT be for the input parameter
 225                          * @obj, because the lfsck_master_oit_engine() has
 226                          * filtered out agent object. So current FID is for
 227                          * the ancestor of the original input parameter @obj.
 228                          * So the ancestor is a remote directory. The input
 229                          * parameter @obj is local directory, and should be
 230                          * scanned under such case. */
 231                         return 1;
 232
 233                 /* normal FID on this target (locally) must be for the
 234                  * client-side visiable object. */
 235                 if (fid_is_norm(fid))
 236                         return 1;
 237
 238                 if (obj == NULL) {
 239                         obj = lfsck_object_find_bottom(env, lfsck, fid);
 240                         if (IS_ERR(obj))
 241                                 return PTR_ERR(obj);
 242
 243                         depth++;
 244                         if (!dt_object_exists(obj))
 245                                 GOTO(out, rc = 0);
 246                 }
 247
 248                 dt_read_lock(env, obj, MOR_TGT_CHILD);
 249                 if (unlikely(lfsck_is_dead_obj(obj))) {
 250                         dt_read_unlock(env, obj);
 251
 252                         GOTO(out, rc = 0);
 253                 }
 254
 255                 rc = dt_xattr_get(env, obj,
 256                                   lfsck_buf_get(env, NULL, 0), XATTR_NAME_LINK,
 257                                   BYPASS_CAPA);
 258                 dt_read_unlock(env, obj);
 259                 if (rc >= 0)
 260                         GOTO(out, rc = 1);
 261
 262                 if (rc < 0 && rc != -ENODATA)
 263                         GOTO(out, rc);
 264
 265                 rc = lfsck_parent_fid(env, obj, fid);
 266                 if (depth > 0)
 267                         lfsck_object_put(env, obj);
 268
 269                 obj = NULL;
 270                 if (rc != 0)
 271                         return rc;
 272
 273                 if (!fid_is_sane(fid))
 274                         return 0;
 275         }
 276
 277 out:
 278         if (depth > 0 && obj != NULL)
 279                 lfsck_object_put(env, obj);
 280
 281         return rc;
 282 }
 283
 284 static int lfsck_load_stripe_lmv(const struct lu_env *env,
 285                                  struct lfsck_instance *lfsck,
 286                                  struct dt_object *obj)
 287 {
 288         struct lmv_mds_md_v1    *lmv    = &lfsck_env_info(env)->lti_lmv;
 289         struct lfsck_lmv        *llmv;
 290         int                      rc;
 291         ENTRY;
 292
 293         LASSERT(lfsck->li_obj_dir == NULL);
 294         LASSERT(lfsck->li_lmv == NULL);
 295
 296         rc = lfsck_read_stripe_lmv(env, obj, lmv);
 297         if (rc == -ENODATA) {
 298                 lfsck->li_obj_dir = lfsck_object_get(obj);
 299
 300                 RETURN(0);
 301         }
 302
 303         if (rc < 0)
 304                 RETURN(rc);
 305
 306         OBD_ALLOC_PTR(llmv);
 307         if (llmv == NULL)
 308                 RETURN(-ENOMEM);
 309
 310         if (lmv->lmv_magic == LMV_MAGIC) {
 311                 struct lfsck_slave_lmv_rec      *lslr;
 312                 __u32                            stripes;
 313
 314                 llmv->ll_lmv_master = 1;
 315                 if (lmv->lmv_stripe_count < 1)
 316                         stripes = LFSCK_LMV_DEF_STRIPES;
 317                 else if (lmv->lmv_stripe_count > LFSCK_LMV_MAX_STRIPES)
 318                         stripes = LFSCK_LMV_MAX_STRIPES;
 319                 else
 320                         stripes = lmv->lmv_stripe_count;
 321
 322                 OBD_ALLOC_LARGE(lslr, sizeof(*lslr) * stripes);
 323                 if (lslr == NULL) {
 324                         OBD_FREE_PTR(llmv);
 325
 326                         RETURN(-ENOMEM);
 327                 }
 328
 329                 llmv->ll_stripes_allocated = stripes;
 330                 llmv->ll_hash_type = LMV_HASH_TYPE_UNKNOWN;
 331                 llmv->ll_lslr = lslr;
 332         } else {
 333                 llmv->ll_lmv_slave = 1;
 334         }
 335
 336         lfsck->li_obj_dir = lfsck_object_get(obj);
 337         llmv->ll_lmv = *lmv;
 338         atomic_set(&llmv->ll_ref, 1);
 339         lfsck->li_lmv = llmv;
 340
 341         RETURN(0);
 342 }
 343
 344 /* LFSCK wrap functions */
 345
 346 static void lfsck_fail(const struct lu_env *env, struct lfsck_instance *lfsck,
 347                        bool new_checked)
 348 {
 349         struct lfsck_component *com;
 350
 351         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 352                 com->lc_ops->lfsck_fail(env, com, new_checked);
 353         }
 354 }
 355
 356 void lfsck_close_dir(const struct lu_env *env,
 357                      struct lfsck_instance *lfsck, int result)
 358 {
 359         struct lfsck_component *com;
 360         ENTRY;
 361
 362         if (lfsck->li_lmv != NULL) {
 363                 lfsck->li_lmv->ll_exit_value = result;
 364                 if (lfsck->li_obj_dir != NULL) {
 365                         list_for_each_entry(com, &lfsck->li_list_dir,
 366                                             lc_link_dir) {
 367                                 com->lc_ops->lfsck_close_dir(env, com);
 368                         }
 369                 }
 370
 371                 lfsck_lmv_put(env, lfsck->li_lmv);
 372                 lfsck->li_lmv = NULL;
 373         }
 374
 375         if (lfsck->li_di_dir != NULL) {
 376                 const struct dt_it_ops  *dir_iops;
 377                 struct dt_it            *dir_di   = lfsck->li_di_dir;
 378
 379                 LASSERT(lfsck->li_obj_dir != NULL);
 380
 381                 dir_iops = &lfsck->li_obj_dir->do_index_ops->dio_it;
 382                 lfsck_di_dir_put(env, lfsck);
 383                 dir_iops->fini(env, dir_di);
 384         }
 385
 386         if (lfsck->li_obj_dir != NULL) {
 387                 struct dt_object        *dir_obj  = lfsck->li_obj_dir;
 388
 389                 lfsck->li_obj_dir = NULL;
 390                 lfsck_object_put(env, dir_obj);
 391         }
 392
 393         EXIT;
 394 }
 395
 396 int lfsck_open_dir(const struct lu_env *env,
 397                    struct lfsck_instance *lfsck, __u64 cookie)
 398 {
 399         struct dt_object        *obj    = lfsck->li_obj_dir;
 400         struct dt_it            *di     = lfsck->li_di_dir;
 401         struct lfsck_component  *com;
 402         const struct dt_it_ops  *iops;
 403         int                      rc     = 0;
 404         ENTRY;
 405
 406         LASSERT(obj != NULL);
 407         LASSERT(di == NULL);
 408
 409         if (unlikely(!dt_try_as_dir(env, obj)))
 410                 GOTO(out, rc = -ENOTDIR);
 411
 412         list_for_each_entry(com, &lfsck->li_list_dir, lc_link_dir) {
 413                 rc = com->lc_ops->lfsck_open_dir(env, com);
 414                 if (rc != 0)
 415                         GOTO(out, rc);
 416         }
 417
 418         iops = &obj->do_index_ops->dio_it;
 419         di = iops->init(env, obj, lfsck->li_args_dir, BYPASS_CAPA);
 420         if (IS_ERR(di))
 421                 GOTO(out, rc = PTR_ERR(di));
 422
 423         rc = iops->load(env, di, cookie);
 424         if (rc == 0 || (rc > 0 && cookie > 0))
 425                 rc = iops->next(env, di);
 426         else if (rc > 0)
 427                 rc = 0;
 428
 429         if (rc != 0) {
 430                 iops->put(env, di);
 431                 iops->fini(env, di);
 432         } else {
 433                 lfsck->li_cookie_dir = iops->store(env, di);
 434                 spin_lock(&lfsck->li_lock);
 435                 lfsck->li_di_dir = di;
 436                 spin_unlock(&lfsck->li_lock);
 437         }
 438
 439         GOTO(out, rc);
 440
 441 out:
 442         if (rc != 0)
 443                 lfsck_close_dir(env, lfsck, rc);
 444
 445         return rc;
 446 }
 447
 448 static int lfsck_checkpoint(const struct lu_env *env,
 449                             struct lfsck_instance *lfsck)
 450 {
 451         struct lfsck_component *com;
 452         int                     rc  = 0;
 453         int                     rc1 = 0;
 454
 455         if (likely(cfs_time_beforeq(cfs_time_current(),
 456                                     lfsck->li_time_next_checkpoint)))
 457                 return 0;
 458
 459         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
 460         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 461                 rc = com->lc_ops->lfsck_checkpoint(env, com, false);
 462                 if (rc != 0)
 463                         rc1 = rc;
 464         }
 465
 466         lfsck->li_time_last_checkpoint = cfs_time_current();
 467         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 468                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
 469         return rc1 != 0 ? rc1 : rc;
 470 }
 471
 472 static int lfsck_prep(const struct lu_env *env, struct lfsck_instance *lfsck,
 473                       struct lfsck_start_param *lsp)
 474 {
 475         struct dt_object       *obj     = NULL;
 476         struct lfsck_component *com;
 477         struct lfsck_component *next;
 478         struct lfsck_position  *pos     = NULL;
 479         const struct dt_it_ops *iops    =
 480                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
 481         int                     rc;
 482         ENTRY;
 483
 484         LASSERT(lfsck->li_obj_dir == NULL);
 485         LASSERT(lfsck->li_di_dir == NULL);
 486
 487         lfsck->li_current_oit_processed = 0;
 488         list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
 489                 com->lc_new_checked = 0;
 490                 rc = com->lc_ops->lfsck_prep(env, com, lsp);
 491                 if (rc != 0)
 492                         GOTO(out, rc);
 493
 494                 if ((pos == NULL) ||
 495                     (!lfsck_pos_is_zero(&com->lc_pos_start) &&
 496                      lfsck_pos_is_eq(pos, &com->lc_pos_start) > 0))
 497                         pos = &com->lc_pos_start;
 498         }
 499
 500         /* Init otable-based iterator. */
 501         if (pos == NULL) {
 502                 rc = iops->load(env, lfsck->li_di_oit, 0);
 503                 if (rc > 0) {
 504                         lfsck->li_oit_over = 1;
 505                         rc = 0;
 506                 }
 507
 508                 GOTO(out, rc);
 509         }
 510
 511         rc = iops->load(env, lfsck->li_di_oit, pos->lp_oit_cookie);
 512         if (rc < 0)
 513                 GOTO(out, rc);
 514         else if (rc > 0)
 515                 lfsck->li_oit_over = 1;
 516
 517         if (!lfsck->li_master || fid_is_zero(&pos->lp_dir_parent))
 518                 GOTO(out, rc = 0);
 519
 520         /* Find the directory for namespace-based traverse. */
 521         obj = lfsck_object_find_bottom(env, lfsck, &pos->lp_dir_parent);
 522         if (IS_ERR(obj))
 523                 RETURN(PTR_ERR(obj));
 524
 525         /* Remote directory will be scanned by the LFSCK instance
 526          * on the MDT where the remote object really resides on. */
 527         if (!dt_object_exists(obj) || dt_object_remote(obj) ||
 528             unlikely(!S_ISDIR(lfsck_object_type(obj))))
 529                 GOTO(out, rc = 0);
 530
 531         rc = lfsck_load_stripe_lmv(env, lfsck, obj);
 532         if (rc == 0) {
 533                 /* For the master MDT-object of a striped directory,
 534                  * reset the iteration from the directory beginning. */
 535                 if (lfsck->li_lmv != NULL && lfsck->li_lmv->ll_lmv_master)
 536                         pos->lp_dir_cookie = 0;
 537
 538                 rc = lfsck_open_dir(env, lfsck, pos->lp_dir_cookie);
 539                 if (rc > 0)
 540                         /* The end of the directory. */
 541                         rc = 0;
 542         }
 543
 544         GOTO(out, rc);
 545
 546 out:
 547         if (obj != NULL)
 548                 lfsck_object_put(env, obj);
 549
 550         if (rc != 0) {
 551                 lfsck_close_dir(env, lfsck, rc);
 552                 list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
 553                                          lc_link) {
 554                         com->lc_ops->lfsck_post(env, com, rc, true);
 555                 }
 556
 557                 return rc;
 558         }
 559
 560         rc = 0;
 561         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, true);
 562         lfsck->li_pos_current = lfsck->li_pos_checkpoint;
 563         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 564                 rc = com->lc_ops->lfsck_checkpoint(env, com, true);
 565                 if (rc != 0)
 566                         break;
 567         }
 568
 569         lfsck->li_time_last_checkpoint = cfs_time_current();
 570         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 571                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
 572         return rc;
 573 }
 574
 575 static int lfsck_exec_oit(const struct lu_env *env,
 576                           struct lfsck_instance *lfsck, struct dt_object *obj)
 577 {
 578         struct lfsck_component *com;
 579         int                     rc;
 580         ENTRY;
 581
 582         LASSERT(lfsck->li_obj_dir == NULL);
 583
 584         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 585                 rc = com->lc_ops->lfsck_exec_oit(env, com, obj);
 586                 if (rc != 0)
 587                         RETURN(rc);
 588         }
 589
 590         rc = lfsck_needs_scan_dir(env, lfsck, obj);
 591         if (rc <= 0)
 592                 GOTO(out, rc);
 593
 594         rc = lfsck_load_stripe_lmv(env, lfsck, obj);
 595         if (rc == 0)
 596                 rc = lfsck_open_dir(env, lfsck, 0);
 597
 598         GOTO(out, rc);
 599
 600 out:
 601         if (rc < 0)
 602                 lfsck_fail(env, lfsck, false);
 603
 604         if (rc != 0)
 605                 lfsck_close_dir(env, lfsck, rc);
 606
 607         return rc > 0 ? 0 : rc;
 608 }
 609
 610 static int lfsck_exec_dir(const struct lu_env *env,
 611                           struct lfsck_instance *lfsck,
 612                           struct lu_dirent *ent, __u16 type)
 613 {
 614         struct lfsck_component *com;
 615         int                     rc;
 616
 617         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 618                 rc = com->lc_ops->lfsck_exec_dir(env, com, ent, type);
 619                 if (rc != 0)
 620                         return rc;
 621         }
 622         return 0;
 623 }
 624
 625 static int lfsck_master_dir_engine(const struct lu_env *env,
 626                                    struct lfsck_instance *lfsck);
 627
 628 static int lfsck_post(const struct lu_env *env, struct lfsck_instance *lfsck,
 629                       int result)
 630 {
 631         struct lfsck_component *com;
 632         struct lfsck_component *next;
 633         int                     rc  = result;
 634
 635         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
 636         lfsck_close_dir(env, lfsck, result);
 637
 638         while (thread_is_running(&lfsck->li_thread) && rc > 0 &&
 639                !list_empty(&lfsck->li_list_lmv)) {
 640                 struct lfsck_lmv_unit *llu;
 641
 642                 spin_lock(&lfsck->li_lock);
 643                 llu = list_entry(lfsck->li_list_lmv.next,
 644                                  struct lfsck_lmv_unit, llu_link);
 645                 list_del_init(&llu->llu_link);
 646                 spin_unlock(&lfsck->li_lock);
 647
 648                 lfsck->li_lmv = &llu->llu_lmv;
 649                 lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
 650                 rc = lfsck_open_dir(env, lfsck, 0);
 651                 if (rc == 0) {
 652                         rc = lfsck_master_dir_engine(env, lfsck);
 653                         lfsck_close_dir(env, lfsck, result);
 654                 }
 655         }
 656
 657         result = rc;
 658
 659         list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
 660                 rc = com->lc_ops->lfsck_post(env, com, result, false);
 661                 if (rc != 0)
 662                         CDEBUG(D_LFSCK, "%s: lfsck_post at the component %u: "
 663                                "rc = %d\n", lfsck_lfsck2name(lfsck),
 664                                (__u32)com->lc_type, rc);
 665         }
 666
 667         lfsck->li_time_last_checkpoint = cfs_time_current();
 668         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 669                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
 670
 671         /* Ignore some component post failure to make other can go ahead. */
 672         return result;
 673 }
 674
 675 static int lfsck_double_scan(const struct lu_env *env,
 676                              struct lfsck_instance *lfsck)
 677 {
 678         struct lfsck_component *com;
 679         struct lfsck_component *next;
 680         struct l_wait_info      lwi = { 0 };
 681         int                     rc  = 0;
 682         int                     rc1 = 0;
 683
 684         list_for_each_entry(com, &lfsck->li_list_double_scan, lc_link) {
 685                 rc = com->lc_ops->lfsck_double_scan(env, com);
 686                 if (rc != 0)
 687                         rc1 = rc;
 688         }
 689
 690         l_wait_event(lfsck->li_thread.t_ctl_waitq,
 691                      atomic_read(&lfsck->li_double_scan_count) == 0,
 692                      &lwi);
 693
 694         if (lfsck->li_status != LS_PAUSED &&
 695             lfsck->li_status != LS_CO_PAUSED) {
 696                 list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
 697                                          lc_link) {
 698                         spin_lock(&lfsck->li_lock);
 699                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 700                         spin_unlock(&lfsck->li_lock);
 701                 }
 702         }
 703
 704         return rc1 != 0 ? rc1 : rc;
 705 }
 706
 707 static void lfsck_quit(const struct lu_env *env, struct lfsck_instance *lfsck)
 708 {
 709         struct lfsck_component *com;
 710         struct lfsck_component *next;
 711
 712         list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
 713                                  lc_link) {
 714                 if (com->lc_ops->lfsck_quit != NULL)
 715                         com->lc_ops->lfsck_quit(env, com);
 716
 717                 spin_lock(&lfsck->li_lock);
 718                 list_del_init(&com->lc_link_dir);
 719                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 720                 spin_unlock(&lfsck->li_lock);
 721         }
 722
 723         list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
 724                                  lc_link) {
 725                 if (com->lc_ops->lfsck_quit != NULL)
 726                         com->lc_ops->lfsck_quit(env, com);
 727
 728                 spin_lock(&lfsck->li_lock);
 729                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 730                 spin_unlock(&lfsck->li_lock);
 731         }
 732 }
 733
 734 /* LFSCK engines */
 735
 736 static int lfsck_master_dir_engine(const struct lu_env *env,
 737                                    struct lfsck_instance *lfsck)
 738 {
 739         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 740         struct dt_object                *dir    = lfsck->li_obj_dir;
 741         const struct dt_it_ops          *iops   = &dir->do_index_ops->dio_it;
 742         struct dt_it                    *di     = lfsck->li_di_dir;
 743         struct lu_dirent                *ent    =
 744                         (struct lu_dirent *)info->lti_key;
 745         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
 746         struct ptlrpc_thread            *thread = &lfsck->li_thread;
 747         int                              rc;
 748         __u16                            type;
 749         ENTRY;
 750
 751         do {
 752                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY2, cfs_fail_val) &&
 753                     unlikely(!thread_is_running(thread))) {
 754                         CDEBUG(D_LFSCK, "%s: scan dir exit for engine stop, "
 755                                "parent "DFID", cookie "LPX64"\n",
 756                                lfsck_lfsck2name(lfsck),
 757                                PFID(lfsck_dto2fid(dir)), lfsck->li_cookie_dir);
 758
 759                         RETURN(0);
 760                 }
 761
 762                 lfsck->li_new_scanned++;
 763                 rc = iops->rec(env, di, (struct dt_rec *)ent,
 764                                lfsck->li_args_dir);
 765                 if (rc == 0)
 766                         rc = lfsck_unpack_ent(ent, &lfsck->li_cookie_dir,
 767                                               &type);
 768
 769                 if (rc != 0) {
 770                         CDEBUG(D_LFSCK, "%s: scan dir failed at rec(), "
 771                                "parent "DFID", cookie "LPX64": rc = %d\n",
 772                                lfsck_lfsck2name(lfsck),
 773                                PFID(lfsck_dto2fid(dir)),
 774                                lfsck->li_cookie_dir, rc);
 775                         lfsck_fail(env, lfsck, true);
 776                         if (bk->lb_param & LPF_FAILOUT)
 777                                 RETURN(rc);
 778                         else
 779                                 goto checkpoint;
 780                 }
 781
 782                 if (ent->lde_attrs & LUDA_IGNORE &&
 783                     strcmp(ent->lde_name, dotdot) != 0)
 784                         goto checkpoint;
 785
 786                 /* The type in the @ent structure may has been overwritten,
 787                  * so we need to pass the @type parameter independently. */
 788                 rc = lfsck_exec_dir(env, lfsck, ent, type);
 789                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 790                         RETURN(rc);
 791
 792 checkpoint:
 793                 rc = lfsck_checkpoint(env, lfsck);
 794                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 795                         RETURN(rc);
 796
 797                 /* Rate control. */
 798                 lfsck_control_speed(lfsck);
 799                 if (unlikely(!thread_is_running(thread))) {
 800                         CDEBUG(D_LFSCK, "%s: scan dir exit for engine stop, "
 801                                "parent "DFID", cookie "LPX64"\n",
 802                                lfsck_lfsck2name(lfsck),
 803                                PFID(lfsck_dto2fid(dir)),
 804                                lfsck->li_cookie_dir);
 805                         RETURN(0);
 806                 }
 807
 808                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL2)) {
 809                         spin_lock(&lfsck->li_lock);
 810                         thread_set_flags(thread, SVC_STOPPING);
 811                         spin_unlock(&lfsck->li_lock);
 812                         RETURN(-EINVAL);
 813                 }
 814
 815                 rc = iops->next(env, di);
 816         } while (rc == 0);
 817
 818         if (rc > 0 && !lfsck->li_oit_over)
 819                 lfsck_close_dir(env, lfsck, rc);
 820
 821         RETURN(rc);
 822 }
 823
 824 /**
 825  * Object-table based iteration engine.
 826  *
 827  * Object-table based iteration is the basic linear engine to scan all the
 828  * objects on current device in turn. For each object, it calls all the
 829  * registered LFSCK component(s)' API to perform related consistency
 830  * verification.
 831  *
 832  * It flushes related LFSCK trace files to disk via making checkpoint
 833  * periodically. Then if the server crashed or the LFSCK is paused, the
 834  * LFSCK can resume from the latest checkpoint.
 835  *
 836  * It also controls the whole LFSCK speed via lfsck_control_speed() to
 837  * avoid the server to become overload.
 838  *
 839  * \param[in] env       pointer to the thread context
 840  * \param[in] lfsck     pointer to the lfsck instance
 841  *
 842  * \retval              positive number if all objects have been scanned
 843  * \retval              0 if the iteration is stopped or paused
 844  * \retval              negative error number on failure
 845  */
 846 static int lfsck_master_oit_engine(const struct lu_env *env,
 847                                    struct lfsck_instance *lfsck)
 848 {
 849         struct lfsck_thread_info *info  = lfsck_env_info(env);
 850         const struct dt_it_ops   *iops  =
 851                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
 852         struct dt_it             *di    = lfsck->li_di_oit;
 853         struct lu_fid            *fid   = &info->lti_fid;
 854         struct lfsck_bookmark    *bk    = &lfsck->li_bookmark_ram;
 855         struct ptlrpc_thread     *thread = &lfsck->li_thread;
 856         struct seq_server_site   *ss    = lfsck_dev_site(lfsck);
 857         __u32                    idx    = lfsck_dev_idx(lfsck);
 858         int                      rc;
 859         ENTRY;
 860
 861         if (unlikely(ss == NULL))
 862                 RETURN(-EIO);
 863
 864         do {
 865                 struct dt_object *target;
 866                 bool              update_lma = false;
 867
 868                 if (lfsck->li_di_dir != NULL) {
 869                         rc = lfsck_master_dir_engine(env, lfsck);
 870                         if (rc <= 0)
 871                                 RETURN(rc);
 872                 }
 873
 874                 if (unlikely(lfsck->li_oit_over))
 875                         RETURN(1);
 876
 877                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY1, cfs_fail_val) &&
 878                     unlikely(!thread_is_running(thread))) {
 879                         CDEBUG(D_LFSCK, "%s: OIT scan exit for engine stop, "
 880                                "cookie "LPU64"\n",
 881                                lfsck_lfsck2name(lfsck), iops->store(env, di));
 882
 883                         RETURN(0);
 884                 }
 885
 886                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_CRASH))
 887                         RETURN(0);
 888
 889                 lfsck->li_current_oit_processed = 1;
 890
 891                 if (!list_empty(&lfsck->li_list_lmv)) {
 892                         struct lfsck_lmv_unit *llu;
 893
 894                         spin_lock(&lfsck->li_lock);
 895                         llu = list_entry(lfsck->li_list_lmv.next,
 896                                          struct lfsck_lmv_unit, llu_link);
 897                         list_del_init(&llu->llu_link);
 898                         spin_unlock(&lfsck->li_lock);
 899
 900                         lfsck->li_lmv = &llu->llu_lmv;
 901                         lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
 902                         rc = lfsck_open_dir(env, lfsck, 0);
 903                         if (rc == 0)
 904                                 rc = lfsck_master_dir_engine(env, lfsck);
 905
 906                         if (rc <= 0)
 907                                 RETURN(rc);
 908                 }
 909
 910                 lfsck->li_new_scanned++;
 911                 lfsck->li_pos_current.lp_oit_cookie = iops->store(env, di);
 912                 rc = iops->rec(env, di, (struct dt_rec *)fid, 0);
 913                 if (rc != 0) {
 914                         CDEBUG(D_LFSCK, "%s: OIT scan failed at rec(): "
 915                                "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 916                         lfsck_fail(env, lfsck, true);
 917                         if (rc < 0 && bk->lb_param & LPF_FAILOUT)
 918                                 RETURN(rc);
 919                         else
 920                                 goto checkpoint;
 921                 }
 922
 923                 if (unlikely(!fid_is_sane(fid))) {
 924                         CDEBUG(D_LFSCK, "%s: OIT scan find invalid FID "DFID
 925                                ", skip it\n",
 926                                lfsck_lfsck2name(lfsck), PFID(fid));
 927                         goto checkpoint;
 928                 }
 929
 930                 if (fid_is_idif(fid)) {
 931                         __u32 idx1 = fid_idif_ost_idx(fid);
 932
 933                         LASSERT(!lfsck->li_master);
 934
 935                         /* It is an old format device, update the LMA. */
 936                         if (idx != idx1) {
 937                                 struct ost_id *oi = &info->lti_oi;
 938
 939                                 fid_to_ostid(fid, oi);
 940                                 ostid_to_fid(fid, oi, idx);
 941                                 update_lma = true;
 942                         }
 943                 } else if (!fid_is_norm(fid) && !fid_is_igif(fid) &&
 944                            !fid_is_last_id(fid) &&
 945                            !lu_fid_eq(fid, &lfsck->li_global_root_fid)) {
 946
 947                         /* If the FID/object is only used locally and invisible
 948                          * to external nodes, then LFSCK will not handle it.
 949                          *
 950                          * dot_lustre sequence has been handled specially. */
 951                         goto checkpoint;
 952                 } else {
 953                         struct lu_seq_range *range = &info->lti_range;
 954
 955                         if (lfsck->li_master)
 956                                 fld_range_set_mdt(range);
 957                         else
 958                                 fld_range_set_ost(range);
 959                         rc = fld_local_lookup(env, ss->ss_server_fld,
 960                                               fid_seq(fid), range);
 961                         if (rc != 0 || range->lsr_index != idx) {
 962                                 /* Remote object will be handled by the LFSCK
 963                                  * instance on the MDT where the remote object
 964                                  * really resides on. */
 965                                 rc = 0;
 966                                 goto checkpoint;
 967                         }
 968                 }
 969
 970                 target = lfsck_object_find_bottom(env, lfsck, fid);
 971                 if (IS_ERR(target)) {
 972                         CDEBUG(D_LFSCK, "%s: OIT scan failed at find target "
 973                                DFID", cookie "LPU64": rc = %d\n",
 974                                lfsck_lfsck2name(lfsck), PFID(fid),
 975                                iops->store(env, di), rc);
 976                         lfsck_fail(env, lfsck, true);
 977                         if (bk->lb_param & LPF_FAILOUT)
 978                                 RETURN(PTR_ERR(target));
 979                         else
 980                                 goto checkpoint;
 981                 }
 982
 983                 if (dt_object_exists(target)) {
 984                         if (update_lma) {
 985                                 rc = lfsck_update_lma(env, lfsck, target);
 986                                 if (rc != 0)
 987                                         CDEBUG(D_LFSCK, "%s: fail to update "
 988                                                "LMA for "DFID": rc = %d\n",
 989                                                lfsck_lfsck2name(lfsck),
 990                                                PFID(lfsck_dto2fid(target)), rc);
 991                         }
 992                         if (rc == 0)
 993                                 rc = lfsck_exec_oit(env, lfsck, target);
 994                 }
 995                 lfsck_object_put(env, target);
 996                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 997                         RETURN(rc);
 998
 999 checkpoint:
1000                 rc = lfsck_checkpoint(env, lfsck);
1001                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
1002                         RETURN(rc);
1003
1004                 /* Rate control. */
1005                 lfsck_control_speed(lfsck);
1006
1007                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL1)) {
1008                         spin_lock(&lfsck->li_lock);
1009                         thread_set_flags(thread, SVC_STOPPING);
1010                         spin_unlock(&lfsck->li_lock);
1011                         RETURN(-EINVAL);
1012                 }
1013
1014                 rc = iops->next(env, di);
1015                 if (unlikely(rc > 0))
1016                         lfsck->li_oit_over = 1;
1017                 else if (likely(rc == 0))
1018                         lfsck->li_current_oit_processed = 0;
1019
1020                 if (unlikely(!thread_is_running(thread))) {
1021                         CDEBUG(D_LFSCK, "%s: OIT scan exit for engine stop, "
1022                                "cookie "LPU64"\n", lfsck_lfsck2name(lfsck),
1023                                iops->store(env, di));
1024                         RETURN(0);
1025                 }
1026         } while (rc == 0 || lfsck->li_di_dir != NULL);
1027
1028         RETURN(rc);
1029 }
1030
1031 int lfsck_master_engine(void *args)
1032 {
1033         struct lfsck_thread_args *lta      = args;
1034         struct lu_env            *env      = &lta->lta_env;
1035         struct lfsck_instance    *lfsck    = lta->lta_lfsck;
1036         struct ptlrpc_thread     *thread   = &lfsck->li_thread;
1037         struct dt_object         *oit_obj  = lfsck->li_obj_oit;
1038         const struct dt_it_ops   *oit_iops = &oit_obj->do_index_ops->dio_it;
1039         struct dt_it             *oit_di;
1040         struct l_wait_info        lwi      = { 0 };
1041         int                       rc;
1042         ENTRY;
1043
1044         if (lfsck->li_master &&
1045             (!list_empty(&lfsck->li_list_scan) ||
1046              !list_empty(&lfsck->li_list_double_scan))) {
1047                 rc = lfsck_verify_lpf(env, lfsck);
1048                 /* Fail to verify the .lustre/lost+found/MDTxxxx/ may be not
1049                  * fatal, because the .lustre/lost+found/ maybe not accessed
1050                  * by the LFSCK if it does not add orphans or others to such
1051                  * directory. So go ahead until hit failure when really uses
1052                  * the directory. */
1053                 if (rc != 0)
1054                         CDEBUG(D_LFSCK, "%s: master engine fail to verify the "
1055                                ".lustre/lost+found/, go ahead: rc = %d\n",
1056                                lfsck_lfsck2name(lfsck), rc);
1057         }
1058
1059         oit_di = oit_iops->init(env, oit_obj, lfsck->li_args_oit, BYPASS_CAPA);
1060         if (IS_ERR(oit_di)) {
1061                 rc = PTR_ERR(oit_di);
1062                 CDEBUG(D_LFSCK, "%s: master engine fail to init iteration: "
1063                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
1064
1065                 GOTO(fini_args, rc);
1066         }
1067
1068         spin_lock(&lfsck->li_lock);
1069         lfsck->li_di_oit = oit_di;
1070         spin_unlock(&lfsck->li_lock);
1071         rc = lfsck_prep(env, lfsck, lta->lta_lsp);
1072         if (rc != 0)
1073                 GOTO(fini_oit, rc);
1074
1075         CDEBUG(D_LFSCK, "LFSCK entry: oit_flags = %#x, dir_flags = %#x, "
1076                "oit_cookie = "LPU64", dir_cookie = "LPX64", parent = "DFID
1077                ", pid = %d\n", lfsck->li_args_oit, lfsck->li_args_dir,
1078                lfsck->li_pos_checkpoint.lp_oit_cookie,
1079                lfsck->li_pos_checkpoint.lp_dir_cookie,
1080                PFID(&lfsck->li_pos_checkpoint.lp_dir_parent),
1081                current_pid());
1082
1083         spin_lock(&lfsck->li_lock);
1084         thread_set_flags(thread, SVC_RUNNING);
1085         spin_unlock(&lfsck->li_lock);
1086         wake_up_all(&thread->t_ctl_waitq);
1087
1088         l_wait_event(thread->t_ctl_waitq,
1089                      lfsck->li_start_unplug ||
1090                      !thread_is_running(thread),
1091                      &lwi);
1092         if (!thread_is_running(thread))
1093                 GOTO(fini_oit, rc = 0);
1094
1095         if (!list_empty(&lfsck->li_list_scan) ||
1096             list_empty(&lfsck->li_list_double_scan))
1097                 rc = lfsck_master_oit_engine(env, lfsck);
1098         else
1099                 rc = 1;
1100
1101         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
1102         CDEBUG(D_LFSCK, "LFSCK exit: oit_flags = %#x, dir_flags = %#x, "
1103                "oit_cookie = "LPU64", dir_cookie = "LPX64", parent = "DFID
1104                ", pid = %d, rc = %d\n", lfsck->li_args_oit, lfsck->li_args_dir,
1105                lfsck->li_pos_checkpoint.lp_oit_cookie,
1106                lfsck->li_pos_checkpoint.lp_dir_cookie,
1107                PFID(&lfsck->li_pos_checkpoint.lp_dir_parent),
1108                current_pid(), rc);
1109
1110         if (!OBD_FAIL_CHECK(OBD_FAIL_LFSCK_CRASH))
1111                 rc = lfsck_post(env, lfsck, rc);
1112         else
1113                 lfsck_close_dir(env, lfsck, rc);
1114
1115 fini_oit:
1116         lfsck_di_oit_put(env, lfsck);
1117         oit_iops->fini(env, oit_di);
1118         if (rc == 1) {
1119                 if (!list_empty(&lfsck->li_list_double_scan))
1120                         rc = lfsck_double_scan(env, lfsck);
1121                 else
1122                         rc = 0;
1123         } else {
1124                 lfsck_quit(env, lfsck);
1125         }
1126
1127         /* XXX: Purge the pinned objects in the future. */
1128
1129 fini_args:
1130         spin_lock(&lfsck->li_lock);
1131         thread_set_flags(thread, SVC_STOPPED);
1132         spin_unlock(&lfsck->li_lock);
1133         wake_up_all(&thread->t_ctl_waitq);
1134         lfsck_thread_args_fini(lta);
1135         return rc;
1136 }
1137
1138 static inline bool lfsck_assistant_req_empty(struct lfsck_assistant_data *lad)
1139 {
1140         bool empty = false;
1141
1142         spin_lock(&lad->lad_lock);
1143         if (list_empty(&lad->lad_req_list))
1144                 empty = true;
1145         spin_unlock(&lad->lad_lock);
1146
1147         return empty;
1148 }
1149
1150 /**
1151  * Query the LFSCK status from the instatnces on remote servers.
1152  *
1153  * The LFSCK assistant thread queries the LFSCK instances on other
1154  * servers (MDT/OST) about their status, such as whether they have
1155  * finished the phase1/phase2 scanning or not, and so on.
1156  *
1157  * \param[in] env       pointer to the thread context
1158  * \param[in] com       pointer to the lfsck component
1159  *
1160  * \retval              0 for success
1161  * \retval              negative error number on failure
1162  */
1163 static int lfsck_assistant_query_others(const struct lu_env *env,
1164                                         struct lfsck_component *com)
1165 {
1166         struct lfsck_thread_info          *info  = lfsck_env_info(env);
1167         struct lfsck_request              *lr    = &info->lti_lr;
1168         struct lfsck_async_interpret_args *laia  = &info->lti_laia;
1169         struct lfsck_instance             *lfsck = com->lc_lfsck;
1170         struct lfsck_assistant_data       *lad   = com->lc_data;
1171         struct ptlrpc_request_set         *set;
1172         struct lfsck_tgt_descs            *ltds;
1173         struct lfsck_tgt_desc             *ltd;
1174         struct list_head                  *phase_head;
1175         int                                rc    = 0;
1176         int                                rc1   = 0;
1177         ENTRY;
1178
1179         set = ptlrpc_prep_set();
1180         if (set == NULL)
1181                 RETURN(-ENOMEM);
1182
1183         lad->lad_touch_gen++;
1184         memset(lr, 0, sizeof(*lr));
1185         lr->lr_event = LE_QUERY;
1186         lr->lr_active = com->lc_type;
1187         laia->laia_com = com;
1188         laia->laia_lr = lr;
1189         laia->laia_shared = 0;
1190
1191         if (!list_empty(&lad->lad_mdt_phase1_list)) {
1192                 ltds = &lfsck->li_mdt_descs;
1193                 lr->lr_flags = 0;
1194                 phase_head = &lad->lad_mdt_phase1_list;
1195         } else if (com->lc_type != LFSCK_TYPE_LAYOUT) {
1196                 goto out;
1197         } else {
1198
1199 again:
1200                 ltds = &lfsck->li_ost_descs;
1201                 lr->lr_flags = LEF_TO_OST;
1202                 phase_head = &lad->lad_ost_phase1_list;
1203         }
1204
1205         laia->laia_ltds = ltds;
1206         spin_lock(&ltds->ltd_lock);
1207         while (!list_empty(phase_head)) {
1208                 struct list_head *phase_list;
1209                 __u32            *gen;
1210
1211                 if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1212                         ltd = list_entry(phase_head->next,
1213                                          struct lfsck_tgt_desc,
1214                                          ltd_layout_phase_list);
1215                         phase_list = &ltd->ltd_layout_phase_list;
1216                         gen = &ltd->ltd_layout_gen;
1217                 } else {
1218                         ltd = list_entry(phase_head->next,
1219                                          struct lfsck_tgt_desc,
1220                                          ltd_namespace_phase_list);
1221                         phase_list = &ltd->ltd_namespace_phase_list;
1222                         gen = &ltd->ltd_namespace_gen;
1223                 }
1224
1225                 if (*gen == lad->lad_touch_gen)
1226                         break;
1227
1228                 *gen = lad->lad_touch_gen;
1229                 list_move_tail(phase_list, phase_head);
1230                 atomic_inc(&ltd->ltd_ref);
1231                 laia->laia_ltd = ltd;
1232                 spin_unlock(&ltds->ltd_lock);
1233                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1234                                          lfsck_async_interpret_common,
1235                                          laia, LFSCK_QUERY);
1236                 if (rc != 0) {
1237                         CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to query "
1238                                "%s %x for %s: rc = %d\n",
1239                                lfsck_lfsck2name(lfsck),
1240                                (lr->lr_flags & LEF_TO_OST) ? "OST" : "MDT",
1241                                ltd->ltd_index, lad->lad_name, rc);
1242                         lfsck_tgt_put(ltd);
1243                         rc1 = rc;
1244                 }
1245                 spin_lock(&ltds->ltd_lock);
1246         }
1247         spin_unlock(&ltds->ltd_lock);
1248
1249         rc = ptlrpc_set_wait(set);
1250         if (rc < 0) {
1251                 ptlrpc_set_destroy(set);
1252                 RETURN(rc);
1253         }
1254
1255         if (com->lc_type == LFSCK_TYPE_LAYOUT && !(lr->lr_flags & LEF_TO_OST) &&
1256             list_empty(&lad->lad_mdt_phase1_list))
1257                 goto again;
1258
1259 out:
1260         ptlrpc_set_destroy(set);
1261
1262         RETURN(rc1 != 0 ? rc1 : rc);
1263 }
1264
1265 /**
1266  * Notify the LFSCK event to the instances on remote servers.
1267  *
1268  * The LFSCK assistant thread notifies the LFSCK instances on other
1269  * servers (MDT/OST) about some events, such as start new scanning,
1270  * stop the scanning, this LFSCK instance will exit, and so on.
1271  *
1272  * \param[in] env       pointer to the thread context
1273  * \param[in] com       pointer to the lfsck component
1274  * \param[in] lr        pointer to the LFSCK event request
1275  *
1276  * \retval              0 for success
1277  * \retval              negative error number on failure
1278  */
1279 static int lfsck_assistant_notify_others(const struct lu_env *env,
1280                                          struct lfsck_component *com,
1281                                          struct lfsck_request *lr)
1282 {
1283         struct lfsck_thread_info          *info  = lfsck_env_info(env);
1284         struct lfsck_async_interpret_args *laia  = &info->lti_laia;
1285         struct lfsck_instance             *lfsck = com->lc_lfsck;
1286         struct lfsck_assistant_data       *lad   = com->lc_data;
1287         struct lfsck_bookmark             *bk    = &lfsck->li_bookmark_ram;
1288         struct ptlrpc_request_set         *set;
1289         struct lfsck_tgt_descs            *ltds;
1290         struct lfsck_tgt_desc             *ltd;
1291         struct lfsck_tgt_desc             *next;
1292         __u32                              idx;
1293         int                                rc    = 0;
1294         int                                rc1   = 0;
1295         ENTRY;
1296
1297         set = ptlrpc_prep_set();
1298         if (set == NULL)
1299                 RETURN(-ENOMEM);
1300
1301         lr->lr_index = lfsck_dev_idx(lfsck);
1302         lr->lr_active = com->lc_type;
1303         laia->laia_com = com;
1304         laia->laia_lr = lr;
1305         laia->laia_shared = 0;
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                         ltd->ltd_layout_done = 0;
1329                         ltd->ltd_synced_failures = 0;
1330                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1331                                         lfsck_async_interpret_common,
1332                                         laia, LFSCK_NOTIFY);
1333                         if (rc != 0) {
1334                                 lfsck_lad_set_bitmap(env, com, idx);
1335                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
1336                                        "notify OST %x for %s start: rc = %d\n",
1337                                        lfsck_lfsck2name(lfsck), idx,
1338                                        lad->lad_name, rc);
1339                                 lfsck_tgt_put(ltd);
1340                         }
1341                 }
1342                 up_read(&ltds->ltd_rw_sem);
1343
1344                 /* Sync up */
1345                 rc = ptlrpc_set_wait(set);
1346                 if (rc < 0) {
1347                         ptlrpc_set_destroy(set);
1348                         RETURN(rc);
1349                 }
1350
1351 next:
1352                 if (!(bk->lb_param & LPF_ALL_TGT))
1353                         break;
1354
1355                 /* link other MDT targets locallly. */
1356                 ltds = &lfsck->li_mdt_descs;
1357                 spin_lock(&ltds->ltd_lock);
1358                 if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1359                         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1360                                 ltd = LTD_TGT(ltds, idx);
1361                                 LASSERT(ltd != NULL);
1362
1363                                 if (!list_empty(&ltd->ltd_layout_list))
1364                                         continue;
1365
1366                                 list_add_tail(&ltd->ltd_layout_list,
1367                                               &lad->lad_mdt_list);
1368                                 list_add_tail(&ltd->ltd_layout_phase_list,
1369                                               &lad->lad_mdt_phase1_list);
1370                         }
1371                 } else {
1372                         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1373                                 ltd = LTD_TGT(ltds, idx);
1374                                 LASSERT(ltd != NULL);
1375
1376                                 if (!list_empty(&ltd->ltd_namespace_list))
1377                                         continue;
1378
1379                                 list_add_tail(&ltd->ltd_namespace_list,
1380                                               &lad->lad_mdt_list);
1381                                 list_add_tail(&ltd->ltd_namespace_phase_list,
1382                                               &lad->lad_mdt_phase1_list);
1383                         }
1384                 }
1385                 spin_unlock(&ltds->ltd_lock);
1386                 break;
1387         case LE_STOP:
1388         case LE_PHASE2_DONE:
1389         case LE_PEER_EXIT: {
1390                 struct list_head *phase_head;
1391
1392                 /* Handle other MDTs firstly if needed, then notify the OSTs. */
1393                 if (bk->lb_param & LPF_ALL_TGT) {
1394                         phase_head = &lad->lad_mdt_list;
1395                         ltds = &lfsck->li_mdt_descs;
1396                         if (lr->lr_event == LE_STOP) {
1397                                 /* unlink other MDT targets locallly. */
1398                                 spin_lock(&ltds->ltd_lock);
1399                                 if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1400                                         list_for_each_entry_safe(ltd, next,
1401                                                 phase_head, ltd_layout_list) {
1402                                                 list_del_init(
1403                                                 &ltd->ltd_layout_phase_list);
1404                                                 list_del_init(
1405                                                 &ltd->ltd_layout_list);
1406                                         }
1407                                 } else {
1408                                         list_for_each_entry_safe(ltd, next,
1409                                                         phase_head,
1410                                                         ltd_namespace_list) {
1411                                                 list_del_init(
1412                                                 &ltd->ltd_namespace_phase_list);
1413                                                 list_del_init(
1414                                                 &ltd->ltd_namespace_list);
1415                                         }
1416                                 }
1417                                 spin_unlock(&ltds->ltd_lock);
1418
1419                                 if (com->lc_type != LFSCK_TYPE_LAYOUT)
1420                                         break;
1421
1422                                 lr->lr_flags |= LEF_TO_OST;
1423                                 phase_head = &lad->lad_ost_list;
1424                                 ltds = &lfsck->li_ost_descs;
1425                         } else {
1426                                 lr->lr_flags &= ~LEF_TO_OST;
1427                         }
1428                 } else if (com->lc_type != LFSCK_TYPE_LAYOUT) {
1429                         break;
1430                 } else {
1431                         lr->lr_flags |= LEF_TO_OST;
1432                         phase_head = &lad->lad_ost_list;
1433                         ltds = &lfsck->li_ost_descs;
1434                 }
1435
1436 again:
1437                 laia->laia_ltds = ltds;
1438                 spin_lock(&ltds->ltd_lock);
1439                 while (!list_empty(phase_head)) {
1440                         if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1441                                 ltd = list_entry(phase_head->next,
1442                                                  struct lfsck_tgt_desc,
1443                                                  ltd_layout_list);
1444                                 if (!list_empty(&ltd->ltd_layout_phase_list))
1445                                         list_del_init(
1446                                                 &ltd->ltd_layout_phase_list);
1447                                 list_del_init(&ltd->ltd_layout_list);
1448                         } else {
1449                                 ltd = list_entry(phase_head->next,
1450                                                  struct lfsck_tgt_desc,
1451                                                  ltd_namespace_list);
1452                                 if (!list_empty(&ltd->ltd_namespace_phase_list))
1453                                         list_del_init(
1454                                                 &ltd->ltd_namespace_phase_list);
1455                                 list_del_init(&ltd->ltd_namespace_list);
1456                         }
1457                         atomic_inc(&ltd->ltd_ref);
1458                         laia->laia_ltd = ltd;
1459                         spin_unlock(&ltds->ltd_lock);
1460                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1461                                         lfsck_async_interpret_common,
1462                                         laia, LFSCK_NOTIFY);
1463                         if (rc != 0) {
1464                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
1465                                        "notify %s %x for %s stop/phase2_done/"
1466                                        "peer_exit: rc = %d\n",
1467                                        lfsck_lfsck2name(lfsck),
1468                                        (lr->lr_flags & LEF_TO_OST) ?
1469                                        "OST" : "MDT", ltd->ltd_index,
1470                                        lad->lad_name, rc);
1471                                 lfsck_tgt_put(ltd);
1472                         }
1473                         spin_lock(&ltds->ltd_lock);
1474                 }
1475                 spin_unlock(&ltds->ltd_lock);
1476
1477                 rc = ptlrpc_set_wait(set);
1478                 if (rc < 0) {
1479                         ptlrpc_set_destroy(set);
1480                         RETURN(rc);
1481                 }
1482
1483                 if (com->lc_type == LFSCK_TYPE_LAYOUT &&
1484                     !(lr->lr_flags & LEF_TO_OST)) {
1485                         lr->lr_flags |= LEF_TO_OST;
1486                         phase_head = &lad->lad_ost_list;
1487                         ltds = &lfsck->li_ost_descs;
1488                         goto again;
1489                 }
1490                 break;
1491         }
1492         case LE_PHASE1_DONE:
1493                 lad->lad_ops->la_sync_failures(env, com, lr);
1494                 lad->lad_touch_gen++;
1495                 ltds = &lfsck->li_mdt_descs;
1496                 laia->laia_ltds = ltds;
1497                 spin_lock(&ltds->ltd_lock);
1498                 while (!list_empty(&lad->lad_mdt_list)) {
1499                         struct list_head *list;
1500                         __u32            *gen;
1501
1502                         if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1503                                 ltd = list_entry(lad->lad_mdt_list.next,
1504                                                  struct lfsck_tgt_desc,
1505                                                  ltd_layout_list);
1506                                 list = &ltd->ltd_layout_list;
1507                                 gen = &ltd->ltd_layout_gen;
1508                         } else {
1509                                 struct lfsck_namespace *ns = com->lc_file_ram;
1510
1511                                 ltd = list_entry(lad->lad_mdt_list.next,
1512                                                  struct lfsck_tgt_desc,
1513                                                  ltd_namespace_list);
1514                                 list = &ltd->ltd_namespace_list;
1515                                 gen = &ltd->ltd_namespace_gen;
1516                                 lr->lr_flags2 = ns->ln_flags & ~LF_INCOMPLETE;
1517                         }
1518
1519                         if (*gen == lad->lad_touch_gen)
1520                                 break;
1521
1522                         *gen = lad->lad_touch_gen;
1523                         list_move_tail(list, &lad->lad_mdt_list);
1524                         if (ltd->ltd_synced_failures)
1525                                 continue;
1526
1527                         atomic_inc(&ltd->ltd_ref);
1528                         laia->laia_ltd = ltd;
1529                         spin_unlock(&ltds->ltd_lock);
1530                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1531                                         lfsck_async_interpret_common,
1532                                         laia, LFSCK_NOTIFY);
1533                         if (rc != 0) {
1534                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
1535                                        "notify MDT %x for %s phase1 done: "
1536                                        "rc = %d\n", lfsck_lfsck2name(lfsck),
1537                                        ltd->ltd_index, lad->lad_name, rc);
1538                                 lfsck_tgt_put(ltd);
1539                         }
1540                         spin_lock(&ltds->ltd_lock);
1541                 }
1542                 spin_unlock(&ltds->ltd_lock);
1543                 break;
1544         default:
1545                 CDEBUG(D_LFSCK, "%s: LFSCK assistant unexpected LFSCK event: "
1546                        "rc = %d\n", lfsck_lfsck2name(lfsck), lr->lr_event);
1547                 rc = -EINVAL;
1548                 break;
1549         }
1550
1551         rc1 = ptlrpc_set_wait(set);
1552         ptlrpc_set_destroy(set);
1553
1554         RETURN(rc != 0 ? rc : rc1);
1555 }
1556
1557 /**
1558  * The LFSCK assistant thread is triggered by the LFSCK main engine.
1559  * They co-work together as an asynchronous pipeline: the LFSCK main
1560  * engine scans the system and pre-fetches the objects, attributes,
1561  * or name entries, etc, and pushes them into the pipeline as input
1562  * requests for the LFSCK assistant thread; on the other end of the
1563  * pipeline, the LFSCK assistant thread performs the real check and
1564  * repair for every request from the main engine.
1565  *
1566  * Generally, the assistant engine may be blocked when check/repair
1567  * something, so the LFSCK main engine will run some faster. On the
1568  * other hand, the LFSCK main engine will drive multiple assistant
1569  * threads in parallel, means for each LFSCK component on the master
1570  * (such as layout LFSCK, namespace LFSCK), there is an independent
1571  * LFSCK assistant thread. So under such 1:N multiple asynchronous
1572  * pipelines mode, the whole LFSCK performance will be much better
1573  * than check/repair everything by the LFSCK main engine itself.
1574  */
1575 int lfsck_assistant_engine(void *args)
1576 {
1577         struct lfsck_thread_args          *lta     = args;
1578         struct lu_env                     *env     = &lta->lta_env;
1579         struct lfsck_component            *com     = lta->lta_com;
1580         struct lfsck_instance             *lfsck   = lta->lta_lfsck;
1581         struct lfsck_bookmark             *bk      = &lfsck->li_bookmark_ram;
1582         struct lfsck_position             *pos     = &com->lc_pos_start;
1583         struct lfsck_thread_info          *info    = lfsck_env_info(env);
1584         struct lfsck_request              *lr      = &info->lti_lr;
1585         struct lfsck_assistant_data       *lad     = com->lc_data;
1586         struct ptlrpc_thread              *mthread = &lfsck->li_thread;
1587         struct ptlrpc_thread              *athread = &lad->lad_thread;
1588         struct lfsck_assistant_operations *lao     = lad->lad_ops;
1589         struct lfsck_assistant_req        *lar;
1590         struct l_wait_info                 lwi     = { 0 };
1591         int                                rc      = 0;
1592         int                                rc1     = 0;
1593         int                                rc2;
1594         ENTRY;
1595
1596         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread start\n",
1597                lfsck_lfsck2name(lfsck), lad->lad_name);
1598
1599         memset(lr, 0, sizeof(*lr));
1600         lr->lr_event = LE_START;
1601         if (pos->lp_oit_cookie <= 1)
1602                 lr->lr_param = LPF_RESET;
1603         rc = lfsck_assistant_notify_others(env, com, lr);
1604         if (rc != 0) {
1605                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to notify others "
1606                        "to start %s: rc = %d\n",
1607                        lfsck_lfsck2name(lfsck), lad->lad_name, rc);
1608                 GOTO(fini, rc);
1609         }
1610
1611         spin_lock(&lad->lad_lock);
1612         thread_set_flags(athread, SVC_RUNNING);
1613         spin_unlock(&lad->lad_lock);
1614         wake_up_all(&mthread->t_ctl_waitq);
1615
1616         while (1) {
1617                 while (!list_empty(&lad->lad_req_list)) {
1618                         bool wakeup = false;
1619
1620                         if (unlikely(lad->lad_exit ||
1621                                      !thread_is_running(mthread)))
1622                                 GOTO(cleanup1, rc = lad->lad_post_result);
1623
1624                         lar = list_entry(lad->lad_req_list.next,
1625                                          struct lfsck_assistant_req,
1626                                          lar_list);
1627                         /* Only the lfsck_assistant_engine thread itself can
1628                          * remove the "lar" from the head of the list, LFSCK
1629                          * engine thread only inserts other new "lar" at the
1630                          * end of the list. So it is safe to handle current
1631                          * "lar" without the spin_lock. */
1632                         rc = lao->la_handler_p1(env, com, lar);
1633                         spin_lock(&lad->lad_lock);
1634                         list_del_init(&lar->lar_list);
1635                         lad->lad_prefetched--;
1636                         /* Wake up the main engine thread only when the list
1637                          * is empty or half of the prefetched items have been
1638                          * handled to avoid too frequent thread schedule. */
1639                         if (lad->lad_prefetched <= (bk->lb_async_windows / 2))
1640                                 wakeup = true;
1641                         spin_unlock(&lad->lad_lock);
1642                         if (wakeup)
1643                                 wake_up_all(&mthread->t_ctl_waitq);
1644
1645                         lao->la_req_fini(env, lar);
1646                         if (rc < 0 && bk->lb_param & LPF_FAILOUT)
1647                                 GOTO(cleanup1, rc);
1648                 }
1649
1650                 l_wait_event(athread->t_ctl_waitq,
1651                              !lfsck_assistant_req_empty(lad) ||
1652                              lad->lad_exit ||
1653                              lad->lad_to_post ||
1654                              lad->lad_to_double_scan,
1655                              &lwi);
1656
1657                 if (unlikely(lad->lad_exit))
1658                         GOTO(cleanup1, rc = lad->lad_post_result);
1659
1660                 if (!list_empty(&lad->lad_req_list))
1661                         continue;
1662
1663                 if (lad->lad_to_post) {
1664                         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread post\n",
1665                                lfsck_lfsck2name(lfsck), lad->lad_name);
1666
1667                         if (unlikely(lad->lad_exit))
1668                                 GOTO(cleanup1, rc = lad->lad_post_result);
1669
1670                         lad->lad_to_post = 0;
1671                         LASSERT(lad->lad_post_result > 0);
1672
1673                         memset(lr, 0, sizeof(*lr));
1674                         lr->lr_event = LE_PHASE1_DONE;
1675                         lr->lr_status = lad->lad_post_result;
1676                         rc = lfsck_assistant_notify_others(env, com, lr);
1677                         if (rc != 0)
1678                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant failed to "
1679                                        "notify others for %s post: rc = %d\n",
1680                                        lfsck_lfsck2name(lfsck),
1681                                        lad->lad_name, rc);
1682
1683                         /* Wakeup the master engine to go ahead. */
1684                         wake_up_all(&mthread->t_ctl_waitq);
1685                 }
1686
1687                 if (lad->lad_to_double_scan) {
1688                         lad->lad_to_double_scan = 0;
1689                         atomic_inc(&lfsck->li_double_scan_count);
1690                         lad->lad_in_double_scan = 1;
1691                         wake_up_all(&mthread->t_ctl_waitq);
1692
1693                         com->lc_new_checked = 0;
1694                         com->lc_new_scanned = 0;
1695                         com->lc_time_last_checkpoint = cfs_time_current();
1696                         com->lc_time_next_checkpoint =
1697                                 com->lc_time_last_checkpoint +
1698                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
1699
1700                         CDEBUG(D_LFSCK, "%s: LFSCK assistant sync before "
1701                                "the second-stage scaning\n",
1702                                lfsck_lfsck2name(lfsck));
1703
1704                         /* Flush async updates before handling orphan. */
1705                         rc2 = dt_sync(env, lfsck->li_next);
1706
1707                         CDEBUG(D_LFSCK, "%s: LFSCK assistant phase2 "
1708                                "scan start, synced: rc = %d\n",
1709                                lfsck_lfsck2name(lfsck), rc2);
1710
1711                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_NO_DOUBLESCAN))
1712                                 GOTO(cleanup2, rc = 0);
1713
1714                         while (lad->lad_in_double_scan) {
1715                                 rc = lfsck_assistant_query_others(env, com);
1716                                 if (lfsck_phase2_next_ready(lad))
1717                                         goto p2_next;
1718
1719                                 if (rc < 0)
1720                                         GOTO(cleanup2, rc);
1721
1722                                 /* Pull LFSCK status on related targets once
1723                                  * per 30 seconds if we are not notified. */
1724                                 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(30),
1725                                                            cfs_time_seconds(1),
1726                                                            NULL, NULL);
1727                                 rc = l_wait_event(athread->t_ctl_waitq,
1728                                         lfsck_phase2_next_ready(lad) ||
1729                                         lad->lad_exit ||
1730                                         !thread_is_running(mthread),
1731                                         &lwi);
1732
1733                                 if (unlikely(lad->lad_exit ||
1734                                              !thread_is_running(mthread)))
1735                                         GOTO(cleanup2, rc = 0);
1736
1737                                 if (rc == -ETIMEDOUT)
1738                                         continue;
1739
1740                                 if (rc < 0)
1741                                         GOTO(cleanup2, rc);
1742
1743 p2_next:
1744                                 rc = lao->la_handler_p2(env, com);
1745                                 if (rc != 0)
1746                                         GOTO(cleanup2, rc);
1747
1748                                 if (unlikely(lad->lad_exit ||
1749                                              !thread_is_running(mthread)))
1750                                         GOTO(cleanup2, rc = 0);
1751                         }
1752                 }
1753         }
1754
1755 cleanup1:
1756         /* Cleanup the unfinished requests. */
1757         spin_lock(&lad->lad_lock);
1758         if (rc < 0)
1759                 lad->lad_assistant_status = rc;
1760
1761         if (lad->lad_exit && lad->lad_post_result <= 0)
1762                 lao->la_fill_pos(env, com, &lfsck->li_pos_checkpoint);
1763
1764         while (!list_empty(&lad->lad_req_list)) {
1765                 lar = list_entry(lad->lad_req_list.next,
1766                                  struct lfsck_assistant_req,
1767                                  lar_list);
1768                 list_del_init(&lar->lar_list);
1769                 lad->lad_prefetched--;
1770                 spin_unlock(&lad->lad_lock);
1771                 lao->la_req_fini(env, lar);
1772                 spin_lock(&lad->lad_lock);
1773         }
1774         spin_unlock(&lad->lad_lock);
1775
1776         LASSERTF(lad->lad_prefetched == 0, "unmatched prefeteched objs %d\n",
1777                  lad->lad_prefetched);
1778
1779 cleanup2:
1780         memset(lr, 0, sizeof(*lr));
1781         if (rc > 0) {
1782                 lr->lr_event = LE_PHASE2_DONE;
1783                 lr->lr_status = rc;
1784         } else if (rc == 0) {
1785                 if (lfsck->li_flags & LPF_ALL_TGT) {
1786                         lr->lr_event = LE_STOP;
1787                         lr->lr_status = LS_STOPPED;
1788                 } else {
1789                         lr->lr_event = LE_PEER_EXIT;
1790                         switch (lfsck->li_status) {
1791                         case LS_PAUSED:
1792                         case LS_CO_PAUSED:
1793                                 lr->lr_status = LS_CO_PAUSED;
1794                                 break;
1795                         case LS_STOPPED:
1796                         case LS_CO_STOPPED:
1797                                 lr->lr_status = LS_CO_STOPPED;
1798                                 break;
1799                         default:
1800                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant unknown "
1801                                        "status: rc = %d\n",
1802                                        lfsck_lfsck2name(lfsck),
1803                                        lfsck->li_status);
1804                                 lr->lr_status = LS_CO_FAILED;
1805                                 break;
1806                         }
1807                 }
1808         } else {
1809                 if (lfsck->li_flags & LPF_ALL_TGT) {
1810                         lr->lr_event = LE_STOP;
1811                         lr->lr_status = LS_FAILED;
1812                 } else {
1813                         lr->lr_event = LE_PEER_EXIT;
1814                         lr->lr_status = LS_CO_FAILED;
1815                 }
1816         }
1817
1818         rc1 = lfsck_assistant_notify_others(env, com, lr);
1819         if (rc1 != 0) {
1820                 CDEBUG(D_LFSCK, "%s: LFSCK assistant failed to notify "
1821                        "others for %s quit: rc = %d\n",
1822                        lfsck_lfsck2name(lfsck), lad->lad_name, rc1);
1823                 rc = rc1;
1824         }
1825
1826         CDEBUG(D_LFSCK, "%s: LFSCK assistant sync before exit\n",
1827                lfsck_lfsck2name(lfsck));
1828
1829         /* Flush async updates before exit. */
1830         rc2 = dt_sync(env, lfsck->li_next);
1831
1832         CDEBUG(D_LFSCK, "%s: LFSCK assistant synced before exit: rc = %d\n",
1833                lfsck_lfsck2name(lfsck), rc2);
1834
1835         /* Under force exit case, some requests may be just freed without
1836          * verification, those objects should be re-handled when next run.
1837          * So not update the on-disk trace file under such case. */
1838         if (lad->lad_in_double_scan) {
1839                 if (!lad->lad_exit)
1840                         rc1 = lao->la_double_scan_result(env, com, rc);
1841
1842                 CDEBUG(D_LFSCK, "%s: LFSCK assistant phase2 scan "
1843                        "finished: rc = %d\n",
1844                        lfsck_lfsck2name(lfsck), rc1 != 0 ? rc1 : rc);
1845         }
1846
1847 fini:
1848         if (lad->lad_in_double_scan)
1849                 atomic_dec(&lfsck->li_double_scan_count);
1850
1851         spin_lock(&lad->lad_lock);
1852         lad->lad_assistant_status = (rc1 != 0 ? rc1 : rc);
1853         thread_set_flags(athread, SVC_STOPPED);
1854         wake_up_all(&mthread->t_ctl_waitq);
1855         spin_unlock(&lad->lad_lock);
1856
1857         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread exit: rc = %d\n",
1858                lfsck_lfsck2name(lfsck), lad->lad_name,
1859                lad->lad_assistant_status);
1860
1861         lfsck_thread_args_fini(lta);
1862
1863         return rc;
1864 }