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) 2012, 2013, 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                *dt     = lfsck->li_bottom;
 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, dt);
 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(env, dt, 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, dt, 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 dt_device         *dev     = lfsck->li_bottom;
 198         struct seq_server_site   *ss      = lu_site2seq(dev->dd_lu_dev.ld_site);
 199         __u32                     idx     = lfsck_dev_idx(dev);
 200         int                       depth   = 0;
 201         int                       rc      = 0;
 202
 203         if (list_empty(&lfsck->li_list_dir) || !S_ISDIR(lfsck_object_type(obj)))
 204                 return 0;
 205
 206         LASSERT(ss != NULL);
 207
 208         *fid = *lfsck_dto2fid(obj);
 209         while (1) {
 210                 /* Global /ROOT is visible. */
 211                 if (unlikely(lu_fid_eq(fid, &lfsck->li_global_root_fid)))
 212                         return 1;
 213
 214                 /* Backend root is invisible. */
 215                 if (unlikely(lu_fid_eq(fid, &lfsck->li_local_root_fid)))
 216                         return 0;
 217
 218                 if (!fid_is_norm(fid) && !fid_is_igif(fid))
 219                         return 0;
 220
 221                 fld_range_set_mdt(range);
 222                 rc = fld_local_lookup(env, ss->ss_server_fld,
 223                                       fid_seq(fid), range);
 224                 if (rc != 0 || range->lsr_index != idx) {
 225                         /* Current FID should NOT be for the input parameter
 226                          * @obj, because the lfsck_master_oit_engine() has
 227                          * filtered out agent object. So current FID is for
 228                          * the ancestor of the original input parameter @obj.
 229                          * So the ancestor is a remote directory. The input
 230                          * parameter @obj is local directory, and should be
 231                          * scanned under such case. */
 232                         LASSERT(depth > 0);
 233
 234                         return 1;
 235                 }
 236
 237                 /* normal FID on this target (locally) must be for the
 238                  * client-side visiable object. */
 239                 if (fid_is_norm(fid))
 240                         return 1;
 241
 242                 if (obj == NULL) {
 243                         obj = lfsck_object_find(env, lfsck, fid);
 244                         if (IS_ERR(obj))
 245                                 return PTR_ERR(obj);
 246
 247                         depth++;
 248                         if (!dt_object_exists(obj))
 249                                 GOTO(out, rc = 0);
 250                 }
 251
 252                 dt_read_lock(env, obj, MOR_TGT_CHILD);
 253                 if (unlikely(lfsck_is_dead_obj(obj))) {
 254                         dt_read_unlock(env, obj);
 255
 256                         GOTO(out, rc = 0);
 257                 }
 258
 259                 rc = dt_xattr_get(env, obj,
 260                                   lfsck_buf_get(env, NULL, 0), XATTR_NAME_LINK,
 261                                   BYPASS_CAPA);
 262                 dt_read_unlock(env, obj);
 263                 if (rc >= 0)
 264                         GOTO(out, rc = 1);
 265
 266                 if (rc < 0 && rc != -ENODATA)
 267                         GOTO(out, rc);
 268
 269                 rc = lfsck_parent_fid(env, obj, fid);
 270                 if (depth > 0)
 271                         lfsck_object_put(env, obj);
 272
 273                 obj = NULL;
 274                 if (rc != 0)
 275                         return rc;
 276
 277                 if (!fid_is_sane(fid))
 278                         return 0;
 279         }
 280
 281 out:
 282         if (depth > 0 && obj != NULL)
 283                 lfsck_object_put(env, obj);
 284
 285         return rc;
 286 }
 287
 288 static int lfsck_load_stripe_lmv(const struct lu_env *env,
 289                                  struct lfsck_instance *lfsck,
 290                                  struct dt_object *obj)
 291 {
 292         struct lmv_mds_md_v1    *lmv    = &lfsck_env_info(env)->lti_lmv;
 293         struct lfsck_lmv        *llmv;
 294         int                      rc;
 295         ENTRY;
 296
 297         LASSERT(lfsck->li_obj_dir == NULL);
 298         LASSERT(lfsck->li_lmv == NULL);
 299
 300         rc = lfsck_read_stripe_lmv(env, obj, lmv);
 301         if (rc == -ENODATA) {
 302                 lfsck->li_obj_dir = lfsck_object_get(obj);
 303
 304                 RETURN(0);
 305         }
 306
 307         if (rc < 0)
 308                 RETURN(rc);
 309
 310         OBD_ALLOC_PTR(llmv);
 311         if (llmv == NULL)
 312                 RETURN(-ENOMEM);
 313
 314         if (lmv->lmv_magic == LMV_MAGIC) {
 315                 struct lfsck_slave_lmv_rec      *lslr;
 316                 __u32                            stripes;
 317
 318                 llmv->ll_lmv_master = 1;
 319                 if (lmv->lmv_stripe_count < 1)
 320                         stripes = LFSCK_LMV_DEF_STRIPES;
 321                 else if (lmv->lmv_stripe_count > LFSCK_LMV_MAX_STRIPES)
 322                         stripes = LFSCK_LMV_MAX_STRIPES;
 323                 else
 324                         stripes = lmv->lmv_stripe_count;
 325
 326                 OBD_ALLOC_LARGE(lslr, sizeof(*lslr) * stripes);
 327                 if (lslr == NULL) {
 328                         OBD_FREE_PTR(llmv);
 329
 330                         RETURN(-ENOMEM);
 331                 }
 332
 333                 /* Find the object against the bottom device. */
 334                 obj = lfsck_object_find_by_dev(env, lfsck->li_bottom,
 335                                                lfsck_dto2fid(obj));
 336                 if (IS_ERR(obj)) {
 337                         OBD_FREE_LARGE(lslr, sizeof(*lslr) * stripes);
 338                         OBD_FREE_PTR(llmv);
 339
 340                         RETURN(PTR_ERR(obj));
 341                 }
 342
 343                 llmv->ll_stripes_allocated = stripes;
 344                 llmv->ll_hash_type = LMV_HASH_TYPE_UNKNOWN;
 345                 llmv->ll_lslr = lslr;
 346                 lfsck->li_obj_dir = obj;
 347         } else {
 348                 llmv->ll_lmv_slave = 1;
 349                 lfsck->li_obj_dir = lfsck_object_get(obj);
 350         }
 351
 352         llmv->ll_lmv = *lmv;
 353         atomic_set(&llmv->ll_ref, 1);
 354         lfsck->li_lmv = llmv;
 355
 356         RETURN(0);
 357 }
 358
 359 /* LFSCK wrap functions */
 360
 361 static void lfsck_fail(const struct lu_env *env, struct lfsck_instance *lfsck,
 362                        bool new_checked)
 363 {
 364         struct lfsck_component *com;
 365
 366         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 367                 com->lc_ops->lfsck_fail(env, com, new_checked);
 368         }
 369 }
 370
 371 void lfsck_close_dir(const struct lu_env *env,
 372                      struct lfsck_instance *lfsck, int result)
 373 {
 374         struct lfsck_component *com;
 375         ENTRY;
 376
 377         if (lfsck->li_lmv != NULL) {
 378                 lfsck->li_lmv->ll_exit_value = result;
 379                 if (lfsck->li_obj_dir != NULL) {
 380                         list_for_each_entry(com, &lfsck->li_list_dir,
 381                                             lc_link_dir) {
 382                                 com->lc_ops->lfsck_close_dir(env, com);
 383                         }
 384                 }
 385
 386                 lfsck_lmv_put(env, lfsck->li_lmv);
 387                 lfsck->li_lmv = NULL;
 388         }
 389
 390         if (lfsck->li_di_dir != NULL) {
 391                 const struct dt_it_ops  *dir_iops;
 392                 struct dt_it            *dir_di   = lfsck->li_di_dir;
 393
 394                 LASSERT(lfsck->li_obj_dir != NULL);
 395
 396                 dir_iops = &lfsck->li_obj_dir->do_index_ops->dio_it;
 397                 lfsck_di_dir_put(env, lfsck);
 398                 dir_iops->fini(env, dir_di);
 399         }
 400
 401         if (lfsck->li_obj_dir != NULL) {
 402                 struct dt_object        *dir_obj  = lfsck->li_obj_dir;
 403
 404                 lfsck->li_obj_dir = NULL;
 405                 lfsck_object_put(env, dir_obj);
 406         }
 407
 408         EXIT;
 409 }
 410
 411 int lfsck_open_dir(const struct lu_env *env,
 412                    struct lfsck_instance *lfsck, __u64 cookie)
 413 {
 414         struct dt_object        *obj    = lfsck->li_obj_dir;
 415         struct dt_it            *di     = lfsck->li_di_dir;
 416         struct lfsck_component  *com;
 417         const struct dt_it_ops  *iops;
 418         int                      rc     = 0;
 419         ENTRY;
 420
 421         LASSERT(obj != NULL);
 422         LASSERT(di == NULL);
 423
 424         if (unlikely(!dt_try_as_dir(env, obj)))
 425                 GOTO(out, rc = -ENOTDIR);
 426
 427         list_for_each_entry(com, &lfsck->li_list_dir, lc_link_dir) {
 428                 rc = com->lc_ops->lfsck_open_dir(env, com);
 429                 if (rc != 0)
 430                         GOTO(out, rc);
 431         }
 432
 433         iops = &obj->do_index_ops->dio_it;
 434         di = iops->init(env, obj, lfsck->li_args_dir, BYPASS_CAPA);
 435         if (IS_ERR(di))
 436                 GOTO(out, rc = PTR_ERR(di));
 437
 438         rc = iops->load(env, di, cookie);
 439         if (rc == 0 || (rc > 0 && cookie > 0))
 440                 rc = iops->next(env, di);
 441         else if (rc > 0)
 442                 rc = 0;
 443
 444         if (rc != 0) {
 445                 iops->put(env, di);
 446                 iops->fini(env, di);
 447         } else {
 448                 lfsck->li_cookie_dir = iops->store(env, di);
 449                 spin_lock(&lfsck->li_lock);
 450                 lfsck->li_di_dir = di;
 451                 spin_unlock(&lfsck->li_lock);
 452         }
 453
 454         GOTO(out, rc);
 455
 456 out:
 457         if (rc != 0)
 458                 lfsck_close_dir(env, lfsck, rc);
 459
 460         return rc;
 461 }
 462
 463 static int lfsck_checkpoint(const struct lu_env *env,
 464                             struct lfsck_instance *lfsck)
 465 {
 466         struct lfsck_component *com;
 467         int                     rc  = 0;
 468         int                     rc1 = 0;
 469
 470         if (likely(cfs_time_beforeq(cfs_time_current(),
 471                                     lfsck->li_time_next_checkpoint)))
 472                 return 0;
 473
 474         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
 475         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 476                 rc = com->lc_ops->lfsck_checkpoint(env, com, false);
 477                 if (rc != 0)
 478                         rc1 = rc;
 479         }
 480
 481         lfsck->li_time_last_checkpoint = cfs_time_current();
 482         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 483                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
 484         return rc1 != 0 ? rc1 : rc;
 485 }
 486
 487 static int lfsck_prep(const struct lu_env *env, struct lfsck_instance *lfsck,
 488                       struct lfsck_start_param *lsp)
 489 {
 490         struct dt_object       *obj     = NULL;
 491         struct lfsck_component *com;
 492         struct lfsck_component *next;
 493         struct lfsck_position  *pos     = NULL;
 494         const struct dt_it_ops *iops    =
 495                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
 496         int                     rc;
 497         ENTRY;
 498
 499         LASSERT(lfsck->li_obj_dir == NULL);
 500         LASSERT(lfsck->li_di_dir == NULL);
 501
 502         lfsck->li_current_oit_processed = 0;
 503         list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
 504                 com->lc_new_checked = 0;
 505                 rc = com->lc_ops->lfsck_prep(env, com, lsp);
 506                 if (rc != 0)
 507                         GOTO(out, rc);
 508
 509                 if ((pos == NULL) ||
 510                     (!lfsck_pos_is_zero(&com->lc_pos_start) &&
 511                      lfsck_pos_is_eq(pos, &com->lc_pos_start) > 0))
 512                         pos = &com->lc_pos_start;
 513         }
 514
 515         /* Init otable-based iterator. */
 516         if (pos == NULL) {
 517                 rc = iops->load(env, lfsck->li_di_oit, 0);
 518                 if (rc > 0) {
 519                         lfsck->li_oit_over = 1;
 520                         rc = 0;
 521                 }
 522
 523                 GOTO(out, rc);
 524         }
 525
 526         rc = iops->load(env, lfsck->li_di_oit, pos->lp_oit_cookie);
 527         if (rc < 0)
 528                 GOTO(out, rc);
 529         else if (rc > 0)
 530                 lfsck->li_oit_over = 1;
 531
 532         if (!lfsck->li_master || fid_is_zero(&pos->lp_dir_parent))
 533                 GOTO(out, rc = 0);
 534
 535         /* Find the directory for namespace-based traverse. */
 536         obj = lfsck_object_find(env, lfsck, &pos->lp_dir_parent);
 537         if (IS_ERR(obj))
 538                 RETURN(PTR_ERR(obj));
 539
 540         /* Remote directory will be scanned by the LFSCK instance
 541          * on the MDT where the remote object really resides on. */
 542         if (!dt_object_exists(obj) || dt_object_remote(obj) ||
 543             unlikely(!S_ISDIR(lfsck_object_type(obj))))
 544                 GOTO(out, rc = 0);
 545
 546         rc = lfsck_load_stripe_lmv(env, lfsck, obj);
 547         if (rc == 0) {
 548                 /* For the master MDT-object of a striped directory,
 549                  * reset the iteration from the directory beginning. */
 550                 if (lfsck->li_lmv != NULL && lfsck->li_lmv->ll_lmv_master)
 551                         pos->lp_dir_cookie = 0;
 552
 553                 rc = lfsck_open_dir(env, lfsck, pos->lp_dir_cookie);
 554                 if (rc > 0)
 555                         /* The end of the directory. */
 556                         rc = 0;
 557         }
 558
 559         GOTO(out, rc);
 560
 561 out:
 562         if (obj != NULL)
 563                 lfsck_object_put(env, obj);
 564
 565         if (rc != 0) {
 566                 lfsck_close_dir(env, lfsck, rc);
 567                 list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
 568                                          lc_link) {
 569                         com->lc_ops->lfsck_post(env, com, rc, true);
 570                 }
 571
 572                 return rc;
 573         }
 574
 575         rc = 0;
 576         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, true);
 577         lfsck->li_pos_current = lfsck->li_pos_checkpoint;
 578         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 579                 rc = com->lc_ops->lfsck_checkpoint(env, com, true);
 580                 if (rc != 0)
 581                         break;
 582         }
 583
 584         lfsck->li_time_last_checkpoint = cfs_time_current();
 585         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 586                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
 587         return rc;
 588 }
 589
 590 static int lfsck_exec_oit(const struct lu_env *env,
 591                           struct lfsck_instance *lfsck, struct dt_object *obj)
 592 {
 593         struct lfsck_component *com;
 594         int                     rc;
 595         ENTRY;
 596
 597         LASSERT(lfsck->li_obj_dir == NULL);
 598
 599         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 600                 rc = com->lc_ops->lfsck_exec_oit(env, com, obj);
 601                 if (rc != 0)
 602                         RETURN(rc);
 603         }
 604
 605         rc = lfsck_needs_scan_dir(env, lfsck, obj);
 606         if (rc <= 0)
 607                 GOTO(out, rc);
 608
 609         rc = lfsck_load_stripe_lmv(env, lfsck, obj);
 610         if (rc == 0)
 611                 rc = lfsck_open_dir(env, lfsck, 0);
 612
 613         GOTO(out, rc);
 614
 615 out:
 616         if (rc < 0)
 617                 lfsck_fail(env, lfsck, false);
 618
 619         if (rc != 0)
 620                 lfsck_close_dir(env, lfsck, rc);
 621
 622         return rc > 0 ? 0 : rc;
 623 }
 624
 625 static int lfsck_exec_dir(const struct lu_env *env,
 626                           struct lfsck_instance *lfsck,
 627                           struct lu_dirent *ent, __u16 type)
 628 {
 629         struct lfsck_component *com;
 630         int                     rc;
 631
 632         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 633                 rc = com->lc_ops->lfsck_exec_dir(env, com, ent, type);
 634                 if (rc != 0)
 635                         return rc;
 636         }
 637         return 0;
 638 }
 639
 640 static int lfsck_master_dir_engine(const struct lu_env *env,
 641                                    struct lfsck_instance *lfsck);
 642
 643 static int lfsck_post(const struct lu_env *env, struct lfsck_instance *lfsck,
 644                       int result)
 645 {
 646         struct lfsck_component *com;
 647         struct lfsck_component *next;
 648         int                     rc  = result;
 649
 650         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
 651         lfsck_close_dir(env, lfsck, result);
 652
 653         while (thread_is_running(&lfsck->li_thread) && rc > 0 &&
 654                !list_empty(&lfsck->li_list_lmv)) {
 655                 struct lfsck_lmv_unit *llu;
 656
 657                 spin_lock(&lfsck->li_lock);
 658                 llu = list_entry(lfsck->li_list_lmv.next,
 659                                  struct lfsck_lmv_unit, llu_link);
 660                 list_del_init(&llu->llu_link);
 661                 spin_unlock(&lfsck->li_lock);
 662
 663                 lfsck->li_lmv = &llu->llu_lmv;
 664                 lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
 665                 rc = lfsck_open_dir(env, lfsck, 0);
 666                 if (rc == 0) {
 667                         rc = lfsck_master_dir_engine(env, lfsck);
 668                         lfsck_close_dir(env, lfsck, result);
 669                 }
 670         }
 671
 672         result = rc;
 673
 674         list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
 675                 rc = com->lc_ops->lfsck_post(env, com, result, false);
 676                 if (rc != 0)
 677                         CDEBUG(D_LFSCK, "%s: lfsck_post at the component %u: "
 678                                "rc = %d\n", lfsck_lfsck2name(lfsck),
 679                                (__u32)com->lc_type, rc);
 680         }
 681
 682         lfsck->li_time_last_checkpoint = cfs_time_current();
 683         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 684                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
 685
 686         /* Ignore some component post failure to make other can go ahead. */
 687         return result;
 688 }
 689
 690 static int lfsck_double_scan(const struct lu_env *env,
 691                              struct lfsck_instance *lfsck)
 692 {
 693         struct lfsck_component *com;
 694         struct lfsck_component *next;
 695         struct l_wait_info      lwi = { 0 };
 696         int                     rc  = 0;
 697         int                     rc1 = 0;
 698
 699         list_for_each_entry(com, &lfsck->li_list_double_scan, lc_link) {
 700                 rc = com->lc_ops->lfsck_double_scan(env, com);
 701                 if (rc != 0)
 702                         rc1 = rc;
 703         }
 704
 705         l_wait_event(lfsck->li_thread.t_ctl_waitq,
 706                      atomic_read(&lfsck->li_double_scan_count) == 0,
 707                      &lwi);
 708
 709         if (lfsck->li_status != LS_PAUSED &&
 710             lfsck->li_status != LS_CO_PAUSED) {
 711                 list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
 712                                          lc_link) {
 713                         spin_lock(&lfsck->li_lock);
 714                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 715                         spin_unlock(&lfsck->li_lock);
 716                 }
 717         }
 718
 719         return rc1 != 0 ? rc1 : rc;
 720 }
 721
 722 static void lfsck_quit(const struct lu_env *env, struct lfsck_instance *lfsck)
 723 {
 724         struct lfsck_component *com;
 725         struct lfsck_component *next;
 726
 727         list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
 728                                  lc_link) {
 729                 if (com->lc_ops->lfsck_quit != NULL)
 730                         com->lc_ops->lfsck_quit(env, com);
 731
 732                 spin_lock(&lfsck->li_lock);
 733                 list_del_init(&com->lc_link_dir);
 734                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 735                 spin_unlock(&lfsck->li_lock);
 736         }
 737
 738         list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
 739                                  lc_link) {
 740                 if (com->lc_ops->lfsck_quit != NULL)
 741                         com->lc_ops->lfsck_quit(env, com);
 742
 743                 spin_lock(&lfsck->li_lock);
 744                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 745                 spin_unlock(&lfsck->li_lock);
 746         }
 747 }
 748
 749 /* LFSCK engines */
 750
 751 static int lfsck_master_dir_engine(const struct lu_env *env,
 752                                    struct lfsck_instance *lfsck)
 753 {
 754         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 755         struct dt_object                *dir    = lfsck->li_obj_dir;
 756         const struct dt_it_ops          *iops   = &dir->do_index_ops->dio_it;
 757         struct dt_it                    *di     = lfsck->li_di_dir;
 758         struct lu_dirent                *ent    =
 759                         (struct lu_dirent *)info->lti_key;
 760         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
 761         struct ptlrpc_thread            *thread = &lfsck->li_thread;
 762         int                              rc;
 763         __u16                            type;
 764         ENTRY;
 765
 766         do {
 767                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_DELAY2) &&
 768                     cfs_fail_val > 0) {
 769                         struct l_wait_info lwi;
 770
 771                         lwi = LWI_TIMEOUT(cfs_time_seconds(cfs_fail_val),
 772                                           NULL, NULL);
 773                         l_wait_event(thread->t_ctl_waitq,
 774                                      !thread_is_running(thread),
 775                                      &lwi);
 776
 777                         if (unlikely(!thread_is_running(thread))) {
 778                                 CDEBUG(D_LFSCK, "%s: scan dir exit for engine "
 779                                        "stop, parent "DFID", cookie "LPX64"\n",
 780                                        lfsck_lfsck2name(lfsck),
 781                                        PFID(lfsck_dto2fid(dir)),
 782                                        lfsck->li_cookie_dir);
 783                                 RETURN(0);
 784                         }
 785                 }
 786
 787                 lfsck->li_new_scanned++;
 788                 rc = iops->rec(env, di, (struct dt_rec *)ent,
 789                                lfsck->li_args_dir);
 790                 if (rc == 0)
 791                         rc = lfsck_unpack_ent(ent, &lfsck->li_cookie_dir,
 792                                               &type);
 793
 794                 if (rc != 0) {
 795                         CDEBUG(D_LFSCK, "%s: scan dir failed at rec(), "
 796                                "parent "DFID", cookie "LPX64": rc = %d\n",
 797                                lfsck_lfsck2name(lfsck),
 798                                PFID(lfsck_dto2fid(dir)),
 799                                lfsck->li_cookie_dir, rc);
 800                         lfsck_fail(env, lfsck, true);
 801                         if (bk->lb_param & LPF_FAILOUT)
 802                                 RETURN(rc);
 803                         else
 804                                 goto checkpoint;
 805                 }
 806
 807                 if (ent->lde_attrs & LUDA_IGNORE &&
 808                     strcmp(ent->lde_name, dotdot) != 0)
 809                         goto checkpoint;
 810
 811                 /* The type in the @ent structure may has been overwritten,
 812                  * so we need to pass the @type parameter independently. */
 813                 rc = lfsck_exec_dir(env, lfsck, ent, type);
 814                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 815                         RETURN(rc);
 816
 817 checkpoint:
 818                 rc = lfsck_checkpoint(env, lfsck);
 819                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 820                         RETURN(rc);
 821
 822                 /* Rate control. */
 823                 lfsck_control_speed(lfsck);
 824                 if (unlikely(!thread_is_running(thread))) {
 825                         CDEBUG(D_LFSCK, "%s: scan dir exit for engine stop, "
 826                                "parent "DFID", cookie "LPX64"\n",
 827                                lfsck_lfsck2name(lfsck),
 828                                PFID(lfsck_dto2fid(dir)),
 829                                lfsck->li_cookie_dir);
 830                         RETURN(0);
 831                 }
 832
 833                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL2)) {
 834                         spin_lock(&lfsck->li_lock);
 835                         thread_set_flags(thread, SVC_STOPPING);
 836                         spin_unlock(&lfsck->li_lock);
 837                         RETURN(-EINVAL);
 838                 }
 839
 840                 rc = iops->next(env, di);
 841         } while (rc == 0);
 842
 843         if (rc > 0 && !lfsck->li_oit_over)
 844                 lfsck_close_dir(env, lfsck, rc);
 845
 846         RETURN(rc);
 847 }
 848
 849 /**
 850  * Object-table based iteration engine.
 851  *
 852  * Object-table based iteration is the basic linear engine to scan all the
 853  * objects on current device in turn. For each object, it calls all the
 854  * registered LFSCK component(s)' API to perform related consistency
 855  * verification.
 856  *
 857  * It flushes related LFSCK trace files to disk via making checkpoint
 858  * periodically. Then if the server crashed or the LFSCK is paused, the
 859  * LFSCK can resume from the latest checkpoint.
 860  *
 861  * It also controls the whole LFSCK speed via lfsck_control_speed() to
 862  * avoid the server to become overload.
 863  *
 864  * \param[in] env       pointer to the thread context
 865  * \param[in] lfsck     pointer to the lfsck instance
 866  *
 867  * \retval              positive number if all objects have been scanned
 868  * \retval              0 if the iteration is stopped or paused
 869  * \retval              negative error number on failure
 870  */
 871 static int lfsck_master_oit_engine(const struct lu_env *env,
 872                                    struct lfsck_instance *lfsck)
 873 {
 874         struct lfsck_thread_info *info  = lfsck_env_info(env);
 875         const struct dt_it_ops   *iops  =
 876                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
 877         struct dt_it             *di    = lfsck->li_di_oit;
 878         struct lu_fid            *fid   = &info->lti_fid;
 879         struct lfsck_bookmark    *bk    = &lfsck->li_bookmark_ram;
 880         struct ptlrpc_thread     *thread = &lfsck->li_thread;
 881         struct dt_device         *dev   = lfsck->li_bottom;
 882         struct seq_server_site   *ss    = lu_site2seq(dev->dd_lu_dev.ld_site);
 883         __u32                    idx    = lfsck_dev_idx(dev);
 884         int                      rc;
 885         ENTRY;
 886
 887         if (unlikely(ss == NULL))
 888                 RETURN(-EIO);
 889
 890         do {
 891                 struct dt_object *target;
 892                 bool              update_lma = false;
 893
 894                 if (lfsck->li_di_dir != NULL) {
 895                         rc = lfsck_master_dir_engine(env, lfsck);
 896                         if (rc <= 0)
 897                                 RETURN(rc);
 898                 }
 899
 900                 if (unlikely(lfsck->li_oit_over))
 901                         RETURN(1);
 902
 903                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_DELAY1) &&
 904                     cfs_fail_val > 0) {
 905                         struct l_wait_info lwi;
 906
 907                         lwi = LWI_TIMEOUT(cfs_time_seconds(cfs_fail_val),
 908                                           NULL, NULL);
 909                         l_wait_event(thread->t_ctl_waitq,
 910                                      !thread_is_running(thread),
 911                                      &lwi);
 912
 913                         if (unlikely(!thread_is_running(thread))) {
 914                                 CDEBUG(D_LFSCK, "%s: OIT scan exit for engine "
 915                                        "stop, cookie "LPU64"\n",
 916                                        lfsck_lfsck2name(lfsck),
 917                                        iops->store(env, di));
 918                                 RETURN(0);
 919                         }
 920                 }
 921
 922                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_CRASH))
 923                         RETURN(0);
 924
 925                 lfsck->li_current_oit_processed = 1;
 926
 927                 if (!list_empty(&lfsck->li_list_lmv)) {
 928                         struct lfsck_lmv_unit *llu;
 929
 930                         spin_lock(&lfsck->li_lock);
 931                         llu = list_entry(lfsck->li_list_lmv.next,
 932                                          struct lfsck_lmv_unit, llu_link);
 933                         list_del_init(&llu->llu_link);
 934                         spin_unlock(&lfsck->li_lock);
 935
 936                         lfsck->li_lmv = &llu->llu_lmv;
 937                         lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
 938                         rc = lfsck_open_dir(env, lfsck, 0);
 939                         if (rc == 0)
 940                                 rc = lfsck_master_dir_engine(env, lfsck);
 941
 942                         if (rc <= 0)
 943                                 RETURN(rc);
 944                 }
 945
 946                 lfsck->li_new_scanned++;
 947                 lfsck->li_pos_current.lp_oit_cookie = iops->store(env, di);
 948                 rc = iops->rec(env, di, (struct dt_rec *)fid, 0);
 949                 if (rc != 0) {
 950                         CDEBUG(D_LFSCK, "%s: OIT scan failed at rec(): "
 951                                "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 952                         lfsck_fail(env, lfsck, true);
 953                         if (rc < 0 && bk->lb_param & LPF_FAILOUT)
 954                                 RETURN(rc);
 955                         else
 956                                 goto checkpoint;
 957                 }
 958
 959                 if (fid_is_idif(fid)) {
 960                         __u32 idx1 = fid_idif_ost_idx(fid);
 961
 962                         LASSERT(!lfsck->li_master);
 963
 964                         /* It is an old format device, update the LMA. */
 965                         if (idx != idx1) {
 966                                 struct ost_id *oi = &info->lti_oi;
 967
 968                                 fid_to_ostid(fid, oi);
 969                                 ostid_to_fid(fid, oi, idx);
 970                                 update_lma = true;
 971                         }
 972                 } else if (!fid_is_norm(fid) && !fid_is_igif(fid) &&
 973                            !fid_is_last_id(fid) &&
 974                            !lu_fid_eq(fid, &lfsck->li_global_root_fid)) {
 975
 976                         /* If the FID/object is only used locally and invisible
 977                          * to external nodes, then LFSCK will not handle it.
 978                          *
 979                          * dot_lustre sequence has been handled specially. */
 980                         goto checkpoint;
 981                 } else {
 982                         struct lu_seq_range *range = &info->lti_range;
 983
 984                         if (lfsck->li_master)
 985                                 fld_range_set_mdt(range);
 986                         else
 987                                 fld_range_set_ost(range);
 988                         rc = fld_local_lookup(env, ss->ss_server_fld,
 989                                               fid_seq(fid), range);
 990                         if (rc != 0 || range->lsr_index != idx) {
 991                                 /* Remote object will be handled by the LFSCK
 992                                  * instance on the MDT where the remote object
 993                                  * really resides on. */
 994                                 rc = 0;
 995                                 goto checkpoint;
 996                         }
 997                 }
 998
 999                 target = lfsck_object_find(env, lfsck, fid);
1000                 if (IS_ERR(target)) {
1001                         CDEBUG(D_LFSCK, "%s: OIT scan failed at find target "
1002                                DFID", cookie "LPU64": rc = %d\n",
1003                                lfsck_lfsck2name(lfsck), PFID(fid),
1004                                iops->store(env, di), rc);
1005                         lfsck_fail(env, lfsck, true);
1006                         if (bk->lb_param & LPF_FAILOUT)
1007                                 RETURN(PTR_ERR(target));
1008                         else
1009                                 goto checkpoint;
1010                 }
1011
1012                 if (dt_object_exists(target)) {
1013                         if (update_lma) {
1014                                 rc = lfsck_update_lma(env, lfsck, target);
1015                                 if (rc != 0)
1016                                         CDEBUG(D_LFSCK, "%s: fail to update "
1017                                                "LMA for "DFID": rc = %d\n",
1018                                                lfsck_lfsck2name(lfsck),
1019                                                PFID(lfsck_dto2fid(target)), rc);
1020                         }
1021                         if (rc == 0)
1022                                 rc = lfsck_exec_oit(env, lfsck, target);
1023                 }
1024                 lfsck_object_put(env, target);
1025                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
1026                         RETURN(rc);
1027
1028 checkpoint:
1029                 rc = lfsck_checkpoint(env, lfsck);
1030                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
1031                         RETURN(rc);
1032
1033                 /* Rate control. */
1034                 lfsck_control_speed(lfsck);
1035
1036                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL1)) {
1037                         spin_lock(&lfsck->li_lock);
1038                         thread_set_flags(thread, SVC_STOPPING);
1039                         spin_unlock(&lfsck->li_lock);
1040                         RETURN(-EINVAL);
1041                 }
1042
1043                 rc = iops->next(env, di);
1044                 if (unlikely(rc > 0))
1045                         lfsck->li_oit_over = 1;
1046                 else if (likely(rc == 0))
1047                         lfsck->li_current_oit_processed = 0;
1048
1049                 if (unlikely(!thread_is_running(thread))) {
1050                         CDEBUG(D_LFSCK, "%s: OIT scan exit for engine stop, "
1051                                "cookie "LPU64"\n", lfsck_lfsck2name(lfsck),
1052                                iops->store(env, di));
1053                         RETURN(0);
1054                 }
1055         } while (rc == 0 || lfsck->li_di_dir != NULL);
1056
1057         RETURN(rc);
1058 }
1059
1060 int lfsck_master_engine(void *args)
1061 {
1062         struct lfsck_thread_args *lta      = args;
1063         struct lu_env            *env      = &lta->lta_env;
1064         struct lfsck_instance    *lfsck    = lta->lta_lfsck;
1065         struct ptlrpc_thread     *thread   = &lfsck->li_thread;
1066         struct dt_object         *oit_obj  = lfsck->li_obj_oit;
1067         const struct dt_it_ops   *oit_iops = &oit_obj->do_index_ops->dio_it;
1068         struct dt_it             *oit_di;
1069         struct l_wait_info        lwi      = { 0 };
1070         int                       rc;
1071         ENTRY;
1072
1073         if (lfsck->li_master &&
1074             (!list_empty(&lfsck->li_list_scan) ||
1075              !list_empty(&lfsck->li_list_double_scan))) {
1076                 rc = lfsck_verify_lpf(env, lfsck);
1077                 /* Fail to verify the .lustre/lost+found/MDTxxxx/ may be not
1078                  * fatal, because the .lustre/lost+found/ maybe not accessed
1079                  * by the LFSCK if it does not add orphans or others to such
1080                  * directory. So go ahead until hit failure when really uses
1081                  * the directory. */
1082                 if (rc != 0)
1083                         CDEBUG(D_LFSCK, "%s: master engine fail to verify the "
1084                                ".lustre/lost+found/, go ahead: rc = %d\n",
1085                                lfsck_lfsck2name(lfsck), rc);
1086         }
1087
1088         oit_di = oit_iops->init(env, oit_obj, lfsck->li_args_oit, BYPASS_CAPA);
1089         if (IS_ERR(oit_di)) {
1090                 rc = PTR_ERR(oit_di);
1091                 CDEBUG(D_LFSCK, "%s: master engine fail to init iteration: "
1092                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
1093
1094                 GOTO(fini_args, rc);
1095         }
1096
1097         spin_lock(&lfsck->li_lock);
1098         lfsck->li_di_oit = oit_di;
1099         spin_unlock(&lfsck->li_lock);
1100         rc = lfsck_prep(env, lfsck, lta->lta_lsp);
1101         if (rc != 0)
1102                 GOTO(fini_oit, rc);
1103
1104         CDEBUG(D_LFSCK, "LFSCK entry: oit_flags = %#x, dir_flags = %#x, "
1105                "oit_cookie = "LPU64", dir_cookie = "LPX64", parent = "DFID
1106                ", pid = %d\n", lfsck->li_args_oit, lfsck->li_args_dir,
1107                lfsck->li_pos_checkpoint.lp_oit_cookie,
1108                lfsck->li_pos_checkpoint.lp_dir_cookie,
1109                PFID(&lfsck->li_pos_checkpoint.lp_dir_parent),
1110                current_pid());
1111
1112         spin_lock(&lfsck->li_lock);
1113         thread_set_flags(thread, SVC_RUNNING);
1114         spin_unlock(&lfsck->li_lock);
1115         wake_up_all(&thread->t_ctl_waitq);
1116
1117         l_wait_event(thread->t_ctl_waitq,
1118                      lfsck->li_start_unplug ||
1119                      !thread_is_running(thread),
1120                      &lwi);
1121         if (!thread_is_running(thread))
1122                 GOTO(fini_oit, rc = 0);
1123
1124         if (!list_empty(&lfsck->li_list_scan) ||
1125             list_empty(&lfsck->li_list_double_scan))
1126                 rc = lfsck_master_oit_engine(env, lfsck);
1127         else
1128                 rc = 1;
1129
1130         CDEBUG(D_LFSCK, "LFSCK exit: oit_flags = %#x, dir_flags = %#x, "
1131                "oit_cookie = "LPU64", dir_cookie = "LPX64", parent = "DFID
1132                ", pid = %d, rc = %d\n", lfsck->li_args_oit, lfsck->li_args_dir,
1133                lfsck->li_pos_checkpoint.lp_oit_cookie,
1134                lfsck->li_pos_checkpoint.lp_dir_cookie,
1135                PFID(&lfsck->li_pos_checkpoint.lp_dir_parent),
1136                current_pid(), rc);
1137
1138         if (!OBD_FAIL_CHECK(OBD_FAIL_LFSCK_CRASH))
1139                 rc = lfsck_post(env, lfsck, rc);
1140         else
1141                 lfsck_close_dir(env, lfsck, rc);
1142
1143 fini_oit:
1144         lfsck_di_oit_put(env, lfsck);
1145         oit_iops->fini(env, oit_di);
1146         if (rc == 1) {
1147                 if (!list_empty(&lfsck->li_list_double_scan))
1148                         rc = lfsck_double_scan(env, lfsck);
1149                 else
1150                         rc = 0;
1151         } else {
1152                 lfsck_quit(env, lfsck);
1153         }
1154
1155         /* XXX: Purge the pinned objects in the future. */
1156
1157 fini_args:
1158         spin_lock(&lfsck->li_lock);
1159         thread_set_flags(thread, SVC_STOPPED);
1160         spin_unlock(&lfsck->li_lock);
1161         wake_up_all(&thread->t_ctl_waitq);
1162         lfsck_thread_args_fini(lta);
1163         return rc;
1164 }
1165
1166 static inline bool lfsck_assistant_req_empty(struct lfsck_assistant_data *lad)
1167 {
1168         bool empty = false;
1169
1170         spin_lock(&lad->lad_lock);
1171         if (list_empty(&lad->lad_req_list))
1172                 empty = true;
1173         spin_unlock(&lad->lad_lock);
1174
1175         return empty;
1176 }
1177
1178 /**
1179  * Query the LFSCK status from the instatnces on remote servers.
1180  *
1181  * The LFSCK assistant thread queries the LFSCK instances on other
1182  * servers (MDT/OST) about their status, such as whether they have
1183  * finished the phase1/phase2 scanning or not, and so on.
1184  *
1185  * \param[in] env       pointer to the thread context
1186  * \param[in] com       pointer to the lfsck component
1187  *
1188  * \retval              0 for success
1189  * \retval              negative error number on failure
1190  */
1191 static int lfsck_assistant_query_others(const struct lu_env *env,
1192                                         struct lfsck_component *com)
1193 {
1194         struct lfsck_thread_info          *info  = lfsck_env_info(env);
1195         struct lfsck_request              *lr    = &info->lti_lr;
1196         struct lfsck_async_interpret_args *laia  = &info->lti_laia;
1197         struct lfsck_instance             *lfsck = com->lc_lfsck;
1198         struct lfsck_assistant_data       *lad   = com->lc_data;
1199         struct ptlrpc_request_set         *set;
1200         struct lfsck_tgt_descs            *ltds;
1201         struct lfsck_tgt_desc             *ltd;
1202         struct list_head                  *phase_head;
1203         int                                rc    = 0;
1204         int                                rc1   = 0;
1205         ENTRY;
1206
1207         set = ptlrpc_prep_set();
1208         if (set == NULL)
1209                 RETURN(-ENOMEM);
1210
1211         lad->lad_touch_gen++;
1212         memset(lr, 0, sizeof(*lr));
1213         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
1214         lr->lr_event = LE_QUERY;
1215         lr->lr_active = com->lc_type;
1216         laia->laia_com = com;
1217         laia->laia_lr = lr;
1218         laia->laia_shared = 0;
1219
1220         if (!list_empty(&lad->lad_mdt_phase1_list)) {
1221                 ltds = &lfsck->li_mdt_descs;
1222                 lr->lr_flags = 0;
1223                 phase_head = &lad->lad_mdt_phase1_list;
1224         } else if (com->lc_type != LFSCK_TYPE_LAYOUT) {
1225                 goto out;
1226         } else {
1227
1228 again:
1229                 ltds = &lfsck->li_ost_descs;
1230                 lr->lr_flags = LEF_TO_OST;
1231                 phase_head = &lad->lad_ost_phase1_list;
1232         }
1233
1234         laia->laia_ltds = ltds;
1235         spin_lock(&ltds->ltd_lock);
1236         while (!list_empty(phase_head)) {
1237                 struct list_head *phase_list;
1238                 __u32            *gen;
1239
1240                 if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1241                         ltd = list_entry(phase_head->next,
1242                                          struct lfsck_tgt_desc,
1243                                          ltd_layout_phase_list);
1244                         phase_list = &ltd->ltd_layout_phase_list;
1245                         gen = &ltd->ltd_layout_gen;
1246                 } else {
1247                         ltd = list_entry(phase_head->next,
1248                                          struct lfsck_tgt_desc,
1249                                          ltd_namespace_phase_list);
1250                         phase_list = &ltd->ltd_namespace_phase_list;
1251                         gen = &ltd->ltd_namespace_gen;
1252                 }
1253
1254                 if (*gen == lad->lad_touch_gen)
1255                         break;
1256
1257                 *gen = lad->lad_touch_gen;
1258                 list_move_tail(phase_list, phase_head);
1259                 atomic_inc(&ltd->ltd_ref);
1260                 laia->laia_ltd = ltd;
1261                 spin_unlock(&ltds->ltd_lock);
1262                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1263                                          lfsck_async_interpret_common,
1264                                          laia, LFSCK_QUERY);
1265                 if (rc != 0) {
1266                         CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to query "
1267                                "%s %x for %s: rc = %d\n",
1268                                lfsck_lfsck2name(lfsck),
1269                                (lr->lr_flags & LEF_TO_OST) ? "OST" : "MDT",
1270                                ltd->ltd_index, lad->lad_name, rc);
1271                         lfsck_tgt_put(ltd);
1272                         rc1 = rc;
1273                 }
1274                 spin_lock(&ltds->ltd_lock);
1275         }
1276         spin_unlock(&ltds->ltd_lock);
1277
1278         rc = ptlrpc_set_wait(set);
1279         if (rc < 0) {
1280                 ptlrpc_set_destroy(set);
1281                 RETURN(rc);
1282         }
1283
1284         if (com->lc_type == LFSCK_TYPE_LAYOUT && !(lr->lr_flags & LEF_TO_OST) &&
1285             list_empty(&lad->lad_mdt_phase1_list))
1286                 goto again;
1287
1288 out:
1289         ptlrpc_set_destroy(set);
1290
1291         RETURN(rc1 != 0 ? rc1 : rc);
1292 }
1293
1294 /**
1295  * Notify the LFSCK event to the instatnces on remote servers.
1296  *
1297  * The LFSCK assistant thread notifies the LFSCK instances on other
1298  * servers (MDT/OST) about some events, such as start new scanning,
1299  * stop the scanning, this LFSCK instance will exit, and so on.
1300  *
1301  * \param[in] env       pointer to the thread context
1302  * \param[in] com       pointer to the lfsck component
1303  * \param[in] lr        pointer to the LFSCK event request
1304  *
1305  * \retval              0 for success
1306  * \retval              negative error number on failure
1307  */
1308 static int lfsck_assistant_notify_others(const struct lu_env *env,
1309                                          struct lfsck_component *com,
1310                                          struct lfsck_request *lr)
1311 {
1312         struct lfsck_thread_info          *info  = lfsck_env_info(env);
1313         struct lfsck_async_interpret_args *laia  = &info->lti_laia;
1314         struct lfsck_instance             *lfsck = com->lc_lfsck;
1315         struct lfsck_assistant_data       *lad   = com->lc_data;
1316         struct lfsck_bookmark             *bk    = &lfsck->li_bookmark_ram;
1317         struct ptlrpc_request_set         *set;
1318         struct lfsck_tgt_descs            *ltds;
1319         struct lfsck_tgt_desc             *ltd;
1320         struct lfsck_tgt_desc             *next;
1321         __u32                              idx;
1322         int                                rc    = 0;
1323         int                                rc1   = 0;
1324         ENTRY;
1325
1326         set = ptlrpc_prep_set();
1327         if (set == NULL)
1328                 RETURN(-ENOMEM);
1329
1330         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
1331         lr->lr_active = com->lc_type;
1332         laia->laia_com = com;
1333         laia->laia_lr = lr;
1334         laia->laia_shared = 0;
1335
1336         switch (lr->lr_event) {
1337         case LE_START:
1338                 if (com->lc_type != LFSCK_TYPE_LAYOUT)
1339                         goto next;
1340
1341                 lr->lr_valid = LSV_SPEED_LIMIT | LSV_ERROR_HANDLE | LSV_DRYRUN |
1342                                LSV_ASYNC_WINDOWS | LSV_CREATE_OSTOBJ;
1343                 lr->lr_speed = bk->lb_speed_limit;
1344                 lr->lr_version = bk->lb_version;
1345                 lr->lr_param |= bk->lb_param;
1346                 lr->lr_async_windows = bk->lb_async_windows;
1347                 lr->lr_flags = LEF_TO_OST;
1348
1349                 /* Notify OSTs firstly, then handle other MDTs if needed. */
1350                 ltds = &lfsck->li_ost_descs;
1351                 laia->laia_ltds = ltds;
1352                 down_read(&ltds->ltd_rw_sem);
1353                 cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1354                         ltd = lfsck_tgt_get(ltds, idx);
1355                         LASSERT(ltd != NULL);
1356
1357                         laia->laia_ltd = ltd;
1358                         ltd->ltd_layout_done = 0;
1359                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1360                                         lfsck_async_interpret_common,
1361                                         laia, LFSCK_NOTIFY);
1362                         if (rc != 0) {
1363                                 lfsck_lad_set_bitmap(env, com, idx);
1364                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
1365                                        "notify OST %x for %s start: rc = %d\n",
1366                                        lfsck_lfsck2name(lfsck), idx,
1367                                        lad->lad_name, rc);
1368                                 lfsck_tgt_put(ltd);
1369                         }
1370                 }
1371                 up_read(&ltds->ltd_rw_sem);
1372
1373                 /* Sync up */
1374                 rc = ptlrpc_set_wait(set);
1375                 if (rc < 0) {
1376                         ptlrpc_set_destroy(set);
1377                         RETURN(rc);
1378                 }
1379
1380 next:
1381                 if (!(bk->lb_param & LPF_ALL_TGT))
1382                         break;
1383
1384                 /* link other MDT targets locallly. */
1385                 ltds = &lfsck->li_mdt_descs;
1386                 spin_lock(&ltds->ltd_lock);
1387                 if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1388                         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1389                                 ltd = LTD_TGT(ltds, idx);
1390                                 LASSERT(ltd != NULL);
1391
1392                                 if (!list_empty(&ltd->ltd_layout_list))
1393                                         continue;
1394
1395                                 list_add_tail(&ltd->ltd_layout_list,
1396                                               &lad->lad_mdt_list);
1397                                 list_add_tail(&ltd->ltd_layout_phase_list,
1398                                               &lad->lad_mdt_phase1_list);
1399                         }
1400                 } else {
1401                         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1402                                 ltd = LTD_TGT(ltds, idx);
1403                                 LASSERT(ltd != NULL);
1404
1405                                 if (!list_empty(&ltd->ltd_namespace_list))
1406                                         continue;
1407
1408                                 list_add_tail(&ltd->ltd_namespace_list,
1409                                               &lad->lad_mdt_list);
1410                                 list_add_tail(&ltd->ltd_namespace_phase_list,
1411                                               &lad->lad_mdt_phase1_list);
1412                         }
1413                 }
1414                 spin_unlock(&ltds->ltd_lock);
1415                 break;
1416         case LE_STOP:
1417         case LE_PHASE2_DONE:
1418         case LE_PEER_EXIT: {
1419                 struct list_head *phase_head;
1420
1421                 /* Handle other MDTs firstly if needed, then notify the OSTs. */
1422                 if (bk->lb_param & LPF_ALL_TGT) {
1423                         phase_head = &lad->lad_mdt_list;
1424                         ltds = &lfsck->li_mdt_descs;
1425                         if (lr->lr_event == LE_STOP) {
1426                                 /* unlink other MDT targets locallly. */
1427                                 spin_lock(&ltds->ltd_lock);
1428                                 if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1429                                         list_for_each_entry_safe(ltd, next,
1430                                                 phase_head, ltd_layout_list) {
1431                                                 list_del_init(
1432                                                 &ltd->ltd_layout_phase_list);
1433                                                 list_del_init(
1434                                                 &ltd->ltd_layout_list);
1435                                         }
1436                                 } else {
1437                                         list_for_each_entry_safe(ltd, next,
1438                                                         phase_head,
1439                                                         ltd_namespace_list) {
1440                                                 list_del_init(
1441                                                 &ltd->ltd_namespace_phase_list);
1442                                                 list_del_init(
1443                                                 &ltd->ltd_namespace_list);
1444                                         }
1445                                 }
1446                                 spin_unlock(&ltds->ltd_lock);
1447
1448                                 if (com->lc_type != LFSCK_TYPE_LAYOUT)
1449                                         break;
1450
1451                                 lr->lr_flags |= LEF_TO_OST;
1452                                 phase_head = &lad->lad_ost_list;
1453                                 ltds = &lfsck->li_ost_descs;
1454                         } else {
1455                                 lr->lr_flags &= ~LEF_TO_OST;
1456                         }
1457                 } else if (com->lc_type != LFSCK_TYPE_LAYOUT) {
1458                         break;
1459                 } else {
1460                         lr->lr_flags |= LEF_TO_OST;
1461                         phase_head = &lad->lad_ost_list;
1462                         ltds = &lfsck->li_ost_descs;
1463                 }
1464
1465 again:
1466                 laia->laia_ltds = ltds;
1467                 spin_lock(&ltds->ltd_lock);
1468                 while (!list_empty(phase_head)) {
1469                         if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1470                                 ltd = list_entry(phase_head->next,
1471                                                  struct lfsck_tgt_desc,
1472                                                  ltd_layout_list);
1473                                 if (!list_empty(&ltd->ltd_layout_phase_list))
1474                                         list_del_init(
1475                                                 &ltd->ltd_layout_phase_list);
1476                                 list_del_init(&ltd->ltd_layout_list);
1477                         } else {
1478                                 ltd = list_entry(phase_head->next,
1479                                                  struct lfsck_tgt_desc,
1480                                                  ltd_namespace_list);
1481                                 if (!list_empty(&ltd->ltd_namespace_phase_list))
1482                                         list_del_init(
1483                                                 &ltd->ltd_namespace_phase_list);
1484                                 list_del_init(&ltd->ltd_namespace_list);
1485                         }
1486                         atomic_inc(&ltd->ltd_ref);
1487                         laia->laia_ltd = ltd;
1488                         spin_unlock(&ltds->ltd_lock);
1489                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1490                                         lfsck_async_interpret_common,
1491                                         laia, LFSCK_NOTIFY);
1492                         if (rc != 0) {
1493                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
1494                                        "notify %s %x for %s stop/phase2_done/"
1495                                        "peer_exit: rc = %d\n",
1496                                        lfsck_lfsck2name(lfsck),
1497                                        (lr->lr_flags & LEF_TO_OST) ?
1498                                        "OST" : "MDT", ltd->ltd_index,
1499                                        lad->lad_name, rc);
1500                                 lfsck_tgt_put(ltd);
1501                         }
1502                         spin_lock(&ltds->ltd_lock);
1503                 }
1504                 spin_unlock(&ltds->ltd_lock);
1505
1506                 rc = ptlrpc_set_wait(set);
1507                 if (rc < 0) {
1508                         ptlrpc_set_destroy(set);
1509                         RETURN(rc);
1510                 }
1511
1512                 if (com->lc_type == LFSCK_TYPE_LAYOUT &&
1513                     !(lr->lr_flags & LEF_TO_OST)) {
1514                         lr->lr_flags |= LEF_TO_OST;
1515                         phase_head = &lad->lad_ost_list;
1516                         ltds = &lfsck->li_ost_descs;
1517                         goto again;
1518                 }
1519                 break;
1520         }
1521         case LE_PHASE1_DONE:
1522                 lad->lad_ops->la_sync_failures(env, com, lr);
1523                 lad->lad_touch_gen++;
1524                 ltds = &lfsck->li_mdt_descs;
1525                 laia->laia_ltds = ltds;
1526                 spin_lock(&ltds->ltd_lock);
1527                 while (!list_empty(&lad->lad_mdt_list)) {
1528                         struct list_head *list;
1529                         __u32            *gen;
1530
1531                         if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1532                                 ltd = list_entry(lad->lad_mdt_list.next,
1533                                                  struct lfsck_tgt_desc,
1534                                                  ltd_layout_list);
1535                                 list = &ltd->ltd_layout_list;
1536                                 gen = &ltd->ltd_layout_gen;
1537                         } else {
1538                                 struct lfsck_namespace *ns = com->lc_file_ram;
1539
1540                                 ltd = list_entry(lad->lad_mdt_list.next,
1541                                                  struct lfsck_tgt_desc,
1542                                                  ltd_namespace_list);
1543                                 list = &ltd->ltd_namespace_list;
1544                                 gen = &ltd->ltd_namespace_gen;
1545                                 lr->lr_flags2 = ns->ln_flags & ~LF_INCOMPLETE;
1546                         }
1547
1548                         if (*gen == lad->lad_touch_gen)
1549                                 break;
1550
1551                         *gen = lad->lad_touch_gen;
1552                         list_move_tail(list, &lad->lad_mdt_list);
1553                         if (ltd->ltd_namespace_failed)
1554                                 continue;
1555
1556                         atomic_inc(&ltd->ltd_ref);
1557                         laia->laia_ltd = ltd;
1558                         spin_unlock(&ltds->ltd_lock);
1559                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1560                                         lfsck_async_interpret_common,
1561                                         laia, LFSCK_NOTIFY);
1562                         if (rc != 0) {
1563                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
1564                                        "notify MDT %x for %s phase1 done: "
1565                                        "rc = %d\n", lfsck_lfsck2name(lfsck),
1566                                        ltd->ltd_index, lad->lad_name, rc);
1567                                 lfsck_tgt_put(ltd);
1568                         }
1569                         spin_lock(&ltds->ltd_lock);
1570                 }
1571                 spin_unlock(&ltds->ltd_lock);
1572                 break;
1573         default:
1574                 CDEBUG(D_LFSCK, "%s: LFSCK assistant unexpected LFSCK event: "
1575                        "rc = %d\n", lfsck_lfsck2name(lfsck), lr->lr_event);
1576                 rc = -EINVAL;
1577                 break;
1578         }
1579
1580         rc1 = ptlrpc_set_wait(set);
1581         ptlrpc_set_destroy(set);
1582
1583         RETURN(rc != 0 ? rc : rc1);
1584 }
1585
1586 /**
1587  * The LFSCK assistant thread is triggered by the LFSCK main engine.
1588  * They co-work together as an asynchronous pipeline: the LFSCK main
1589  * engine scans the system and pre-fetches the objects, attributes,
1590  * or name entries, etc, and pushes them into the pipeline as input
1591  * requests for the LFSCK assistant thread; on the other end of the
1592  * pipeline, the LFSCK assistant thread performs the real check and
1593  * repair for every request from the main engine.
1594  *
1595  * Generally, the assistant engine may be blocked when check/repair
1596  * something, so the LFSCK main engine will run some faster. On the
1597  * other hand, the LFSCK main engine will drive multiple assistant
1598  * threads in parallel, means for each LFSCK component on the master
1599  * (such as layout LFSCK, namespace LFSCK), there is an independent
1600  * LFSCK assistant thread. So under such 1:N multiple asynchronous
1601  * pipelines mode, the whole LFSCK performance will be much better
1602  * than check/repair everything by the LFSCK main engine itself.
1603  */
1604 int lfsck_assistant_engine(void *args)
1605 {
1606         struct lfsck_thread_args          *lta     = args;
1607         struct lu_env                     *env     = &lta->lta_env;
1608         struct lfsck_component            *com     = lta->lta_com;
1609         struct lfsck_instance             *lfsck   = lta->lta_lfsck;
1610         struct lfsck_bookmark             *bk      = &lfsck->li_bookmark_ram;
1611         struct lfsck_position             *pos     = &com->lc_pos_start;
1612         struct lfsck_thread_info          *info    = lfsck_env_info(env);
1613         struct lfsck_request              *lr      = &info->lti_lr;
1614         struct lfsck_assistant_data       *lad     = com->lc_data;
1615         struct ptlrpc_thread              *mthread = &lfsck->li_thread;
1616         struct ptlrpc_thread              *athread = &lad->lad_thread;
1617         struct lfsck_assistant_operations *lao     = lad->lad_ops;
1618         struct lfsck_assistant_req        *lar;
1619         struct l_wait_info                 lwi     = { 0 };
1620         int                                rc      = 0;
1621         int                                rc1     = 0;
1622         ENTRY;
1623
1624         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread start\n",
1625                lfsck_lfsck2name(lfsck), lad->lad_name);
1626
1627         memset(lr, 0, sizeof(*lr));
1628         lr->lr_event = LE_START;
1629         if (pos->lp_oit_cookie <= 1)
1630                 lr->lr_param = LPF_RESET;
1631         rc = lfsck_assistant_notify_others(env, com, lr);
1632         if (rc != 0) {
1633                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to notify others "
1634                        "to start %s: rc = %d\n",
1635                        lfsck_lfsck2name(lfsck), lad->lad_name, rc);
1636                 GOTO(fini, rc);
1637         }
1638
1639         spin_lock(&lad->lad_lock);
1640         thread_set_flags(athread, SVC_RUNNING);
1641         spin_unlock(&lad->lad_lock);
1642         wake_up_all(&mthread->t_ctl_waitq);
1643
1644         while (1) {
1645                 while (!list_empty(&lad->lad_req_list)) {
1646                         bool wakeup = false;
1647
1648                         if (unlikely(lad->lad_exit ||
1649                                      !thread_is_running(mthread)))
1650                                 GOTO(cleanup1, rc = lad->lad_post_result);
1651
1652                         lar = list_entry(lad->lad_req_list.next,
1653                                          struct lfsck_assistant_req,
1654                                          lar_list);
1655                         /* Only the lfsck_assistant_engine thread itself can
1656                          * remove the "lar" from the head of the list, LFSCK
1657                          * engine thread only inserts other new "lar" at the
1658                          * end of the list. So it is safe to handle current
1659                          * "lar" without the spin_lock. */
1660                         rc = lao->la_handler_p1(env, com, lar);
1661                         spin_lock(&lad->lad_lock);
1662                         list_del_init(&lar->lar_list);
1663                         lad->lad_prefetched--;
1664                         /* Wake up the main engine thread only when the list
1665                          * is empty or half of the prefetched items have been
1666                          * handled to avoid too frequent thread schedule. */
1667                         if (lad->lad_prefetched == 0 ||
1668                             (bk->lb_async_windows != 0 &&
1669                              bk->lb_async_windows / 2 ==
1670                              lad->lad_prefetched))
1671                                 wakeup = true;
1672                         spin_unlock(&lad->lad_lock);
1673                         if (wakeup)
1674                                 wake_up_all(&mthread->t_ctl_waitq);
1675
1676                         lao->la_req_fini(env, lar);
1677                         if (rc < 0 && bk->lb_param & LPF_FAILOUT)
1678                                 GOTO(cleanup1, rc);
1679                 }
1680
1681                 l_wait_event(athread->t_ctl_waitq,
1682                              !lfsck_assistant_req_empty(lad) ||
1683                              lad->lad_exit ||
1684                              lad->lad_to_post ||
1685                              lad->lad_to_double_scan,
1686                              &lwi);
1687
1688                 if (unlikely(lad->lad_exit))
1689                         GOTO(cleanup1, rc = lad->lad_post_result);
1690
1691                 if (!list_empty(&lad->lad_req_list))
1692                         continue;
1693
1694                 if (lad->lad_to_post) {
1695                         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread post\n",
1696                                lfsck_lfsck2name(lfsck), lad->lad_name);
1697
1698                         if (unlikely(lad->lad_exit))
1699                                 GOTO(cleanup1, rc = lad->lad_post_result);
1700
1701                         lad->lad_to_post = 0;
1702                         LASSERT(lad->lad_post_result > 0);
1703
1704                         memset(lr, 0, sizeof(*lr));
1705                         lr->lr_event = LE_PHASE1_DONE;
1706                         lr->lr_status = lad->lad_post_result;
1707                         rc = lfsck_assistant_notify_others(env, com, lr);
1708                         if (rc != 0)
1709                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant failed to "
1710                                        "notify others for %s post: rc = %d\n",
1711                                        lfsck_lfsck2name(lfsck),
1712                                        lad->lad_name, rc);
1713
1714                         /* Wakeup the master engine to go ahead. */
1715                         wake_up_all(&mthread->t_ctl_waitq);
1716                 }
1717
1718                 if (lad->lad_to_double_scan) {
1719                         lad->lad_to_double_scan = 0;
1720                         atomic_inc(&lfsck->li_double_scan_count);
1721                         lad->lad_in_double_scan = 1;
1722                         wake_up_all(&mthread->t_ctl_waitq);
1723
1724                         com->lc_new_checked = 0;
1725                         com->lc_new_scanned = 0;
1726                         com->lc_time_last_checkpoint = cfs_time_current();
1727                         com->lc_time_next_checkpoint =
1728                                 com->lc_time_last_checkpoint +
1729                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
1730
1731                         /* Flush async updates before handling orphan. */
1732                         dt_sync(env, lfsck->li_next);
1733
1734                         CDEBUG(D_LFSCK, "%s: LFSCK assistant phase2 "
1735                                "scan start\n", lfsck_lfsck2name(lfsck));
1736
1737                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_NO_DOUBLESCAN))
1738                                 GOTO(cleanup2, rc = 0);
1739
1740                         while (lad->lad_in_double_scan) {
1741                                 rc = lfsck_assistant_query_others(env, com);
1742                                 if (lfsck_phase2_next_ready(lad))
1743                                         goto p2_next;
1744
1745                                 if (rc < 0)
1746                                         GOTO(cleanup2, rc);
1747
1748                                 /* Pull LFSCK status on related targets once
1749                                  * per 30 seconds if we are not notified. */
1750                                 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(30),
1751                                                            cfs_time_seconds(1),
1752                                                            NULL, NULL);
1753                                 rc = l_wait_event(athread->t_ctl_waitq,
1754                                         lfsck_phase2_next_ready(lad) ||
1755                                         lad->lad_exit ||
1756                                         !thread_is_running(mthread),
1757                                         &lwi);
1758
1759                                 if (unlikely(lad->lad_exit ||
1760                                              !thread_is_running(mthread)))
1761                                         GOTO(cleanup2, rc = 0);
1762
1763                                 if (rc == -ETIMEDOUT)
1764                                         continue;
1765
1766                                 if (rc < 0)
1767                                         GOTO(cleanup2, rc);
1768
1769 p2_next:
1770                                 rc = lao->la_handler_p2(env, com);
1771                                 if (rc != 0)
1772                                         GOTO(cleanup2, rc);
1773
1774                                 if (unlikely(lad->lad_exit ||
1775                                              !thread_is_running(mthread)))
1776                                         GOTO(cleanup2, rc = 0);
1777                         }
1778                 }
1779         }
1780
1781 cleanup1:
1782         /* Cleanup the unfinished requests. */
1783         spin_lock(&lad->lad_lock);
1784         if (rc < 0)
1785                 lad->lad_assistant_status = rc;
1786
1787         if (lad->lad_exit && lad->lad_post_result <= 0)
1788                 lao->la_fill_pos(env, com, &lfsck->li_pos_checkpoint);
1789
1790         while (!list_empty(&lad->lad_req_list)) {
1791                 lar = list_entry(lad->lad_req_list.next,
1792                                  struct lfsck_assistant_req,
1793                                  lar_list);
1794                 list_del_init(&lar->lar_list);
1795                 lad->lad_prefetched--;
1796                 spin_unlock(&lad->lad_lock);
1797                 lao->la_req_fini(env, lar);
1798                 spin_lock(&lad->lad_lock);
1799         }
1800         spin_unlock(&lad->lad_lock);
1801
1802         LASSERTF(lad->lad_prefetched == 0, "unmatched prefeteched objs %d\n",
1803                  lad->lad_prefetched);
1804
1805 cleanup2:
1806         memset(lr, 0, sizeof(*lr));
1807         if (rc > 0) {
1808                 lr->lr_event = LE_PHASE2_DONE;
1809                 lr->lr_status = rc;
1810         } else if (rc == 0) {
1811                 if (lfsck->li_flags & LPF_ALL_TGT) {
1812                         lr->lr_event = LE_STOP;
1813                         lr->lr_status = LS_STOPPED;
1814                 } else {
1815                         lr->lr_event = LE_PEER_EXIT;
1816                         switch (lfsck->li_status) {
1817                         case LS_PAUSED:
1818                         case LS_CO_PAUSED:
1819                                 lr->lr_status = LS_CO_PAUSED;
1820                                 break;
1821                         case LS_STOPPED:
1822                         case LS_CO_STOPPED:
1823                                 lr->lr_status = LS_CO_STOPPED;
1824                                 break;
1825                         default:
1826                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant unknown "
1827                                        "status: rc = %d\n",
1828                                        lfsck_lfsck2name(lfsck),
1829                                        lfsck->li_status);
1830                                 lr->lr_status = LS_CO_FAILED;
1831                                 break;
1832                         }
1833                 }
1834         } else {
1835                 if (lfsck->li_flags & LPF_ALL_TGT) {
1836                         lr->lr_event = LE_STOP;
1837                         lr->lr_status = LS_FAILED;
1838                 } else {
1839                         lr->lr_event = LE_PEER_EXIT;
1840                         lr->lr_status = LS_CO_FAILED;
1841                 }
1842         }
1843
1844         rc1 = lfsck_assistant_notify_others(env, com, lr);
1845         if (rc1 != 0) {
1846                 CDEBUG(D_LFSCK, "%s: LFSCK assistant failed to notify "
1847                        "others for %s quit: rc = %d\n",
1848                        lfsck_lfsck2name(lfsck), lad->lad_name, rc1);
1849                 rc = rc1;
1850         }
1851
1852         /* Flush async updates before exit. */
1853         dt_sync(env, lfsck->li_next);
1854
1855         /* Under force exit case, some requests may be just freed without
1856          * verification, those objects should be re-handled when next run.
1857          * So not update the on-disk trace file under such case. */
1858         if (lad->lad_in_double_scan) {
1859                 if (!lad->lad_exit)
1860                         rc1 = lao->la_double_scan_result(env, com, rc);
1861
1862                 CDEBUG(D_LFSCK, "%s: LFSCK assistant phase2 scan "
1863                        "finished: rc = %d\n",
1864                        lfsck_lfsck2name(lfsck), rc1 != 0 ? rc1 : rc);
1865         }
1866
1867 fini:
1868         if (lad->lad_in_double_scan)
1869                 atomic_dec(&lfsck->li_double_scan_count);
1870
1871         spin_lock(&lad->lad_lock);
1872         lad->lad_assistant_status = (rc1 != 0 ? rc1 : rc);
1873         thread_set_flags(athread, SVC_STOPPED);
1874         wake_up_all(&mthread->t_ctl_waitq);
1875         spin_unlock(&lad->lad_lock);
1876
1877         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread exit: rc = %d\n",
1878                lfsck_lfsck2name(lfsck), lad->lad_name,
1879                lad->lad_assistant_status);
1880
1881         lfsck_thread_args_fini(lta);
1882
1883         return rc;
1884 }