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