lustre/lfsck/lfsck_engine.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.  A copy is
  14  * included in the COPYING file that accompanied this code.
  15
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2013, 2016, Intel Corporation.
  24  */
  25 /*
  26  * lustre/lfsck/lfsck_engine.c
  27  *
  28  * Author: Fan, Yong <fan.yong@intel.com>
  29  */
  30
  31 #define DEBUG_SUBSYSTEM S_LFSCK
  32
  33 #include <lu_object.h>
  34 #include <dt_object.h>
  35 #include <lustre_net.h>
  36 #include <lustre_fid.h>
  37 #include <obd_support.h>
  38 #include <lustre_lib.h>
  39
  40 #include "lfsck_internal.h"
  41
  42 int lfsck_unpack_ent(struct lu_dirent *ent, __u64 *cookie, __u16 *type)
  43 {
  44         struct luda_type        *lt;
  45         int                      align = sizeof(*lt) - 1;
  46         int                      len;
  47
  48         fid_le_to_cpu(&ent->lde_fid, &ent->lde_fid);
  49         *cookie = le64_to_cpu(ent->lde_hash);
  50         ent->lde_reclen = le16_to_cpu(ent->lde_reclen);
  51         ent->lde_namelen = le16_to_cpu(ent->lde_namelen);
  52         ent->lde_attrs = le32_to_cpu(ent->lde_attrs);
  53
  54         if (unlikely(!(ent->lde_attrs & LUDA_TYPE)))
  55                 return -EINVAL;
  56
  57         len = (ent->lde_namelen + align) & ~align;
  58         lt = (struct luda_type *)(ent->lde_name + len);
  59         *type = le16_to_cpu(lt->lt_type);
  60
  61         /* Make sure the name is terminated with '\0'. The data (object type)
  62          * after ent::lde_name maybe broken, but we have stored such data in
  63          * the output parameter @type as above. */
  64         ent->lde_name[ent->lde_namelen] = '\0';
  65
  66         return 0;
  67 }
  68
  69 static void lfsck_di_oit_put(const struct lu_env *env, struct lfsck_instance *lfsck)
  70 {
  71         const struct dt_it_ops  *iops;
  72         struct dt_it            *di;
  73
  74         spin_lock(&lfsck->li_lock);
  75         iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
  76         di = lfsck->li_di_oit;
  77         lfsck->li_di_oit = NULL;
  78         spin_unlock(&lfsck->li_lock);
  79         iops->put(env, di);
  80 }
  81
  82 static void lfsck_di_dir_put(const struct lu_env *env, struct lfsck_instance *lfsck)
  83 {
  84         const struct dt_it_ops  *iops;
  85         struct dt_it            *di;
  86
  87         spin_lock(&lfsck->li_lock);
  88         iops = &lfsck->li_obj_dir->do_index_ops->dio_it;
  89         di = lfsck->li_di_dir;
  90         lfsck->li_di_dir = NULL;
  91         lfsck->li_cookie_dir = 0;
  92         spin_unlock(&lfsck->li_lock);
  93         iops->put(env, di);
  94 }
  95
  96 static int lfsck_parent_fid(const struct lu_env *env, struct dt_object *obj,
  97                             struct lu_fid *fid)
  98 {
  99         if (unlikely(!S_ISDIR(lfsck_object_type(obj)) ||
 100                      !dt_try_as_dir(env, obj)))
 101                 return -ENOTDIR;
 102
 103         return dt_lookup(env, obj, (struct dt_rec *)fid,
 104                          (const struct dt_key *)"..");
 105 }
 106
 107 /**
 108  * Check whether needs to scan the directory or not.
 109  *
 110  * 1) If we are not doing namespace LFSCK, or the given @obj is not directory,
 111  *    then needs not to scan the @obj. Otherwise,
 112  * 2) Global /ROOT needs to be scanned, backend root needs not to be scanned.
 113  * 3) If the @obj is neither IGIF nor normal FID (including .lustre and its
 114  *    sub-directories that have been scanned when the LFSCK engine start),
 115  *    then needs not to be scanned.
 116  * 4) If it is a remote object, then scanning the object will be done on the
 117  *    MDT on which the object really resides.
 118  * 5) If the local object has normal FID, then needs to be scanned. Otherwise,
 119  * 6) If the object has linkEA, then needs to be scanned. Otherwise,
 120  * 7) If none of the previous conditions are true, we need to check the parent
 121  *    directories whether this subdirectory is in a tree that should be scanned.
 122  *    Set the parent as current @obj, repeat 2)-7).
 123  *
 124  * \param[in] env       pointer to the thread context
 125  * \param[in] lfsck     pointer to the lfsck instance
 126  * \param[in] obj       pointer to the object to be checked
 127  *
 128  * \retval              positive number if the directory needs to be scanned
 129  * \retval              0 if the directory needs NOT to be scanned
 130  * \retval              negative error number on failure
 131  */
 132 static int lfsck_needs_scan_dir(const struct lu_env *env,
 133                                 struct lfsck_instance *lfsck,
 134                                 struct dt_object *obj)
 135 {
 136         struct lfsck_thread_info *info    = lfsck_env_info(env);
 137         struct lu_fid            *fid     = &info->lti_fid;
 138         struct lu_seq_range      *range   = &info->lti_range;
 139         struct seq_server_site   *ss      = lfsck_dev_site(lfsck);
 140         __u32                     idx     = lfsck_dev_idx(lfsck);
 141         int                       depth   = 0;
 142         int                       rc      = 0;
 143
 144         if (list_empty(&lfsck->li_list_dir) || !S_ISDIR(lfsck_object_type(obj)))
 145                 return 0;
 146
 147         LASSERT(ss != NULL);
 148
 149         *fid = *lfsck_dto2fid(obj);
 150         while (1) {
 151                 /* Global /ROOT is visible. */
 152                 if (unlikely(lu_fid_eq(fid, &lfsck->li_global_root_fid)))
 153                         return 1;
 154
 155                 /* Backend root is invisible. */
 156                 if (unlikely(lu_fid_eq(fid, &lfsck->li_local_root_fid)))
 157                         return 0;
 158
 159                 if (!fid_is_norm(fid) && !fid_is_igif(fid))
 160                         return 0;
 161
 162                 fld_range_set_mdt(range);
 163                 rc = fld_local_lookup(env, ss->ss_server_fld,
 164                                       fid_seq(fid), range);
 165                 if (rc != 0 || range->lsr_index != idx)
 166                         /* Current FID should NOT be for the input parameter
 167                          * @obj, because the lfsck_master_oit_engine() has
 168                          * filtered out agent object. So current FID is for
 169                          * the ancestor of the original input parameter @obj.
 170                          * So the ancestor is a remote directory. The input
 171                          * parameter @obj is local directory, and should be
 172                          * scanned under such case. */
 173                         return 1;
 174
 175                 /* normal FID on this target (locally) must be for the
 176                  * client-side visiable object. */
 177                 if (fid_is_norm(fid))
 178                         return 1;
 179
 180                 if (obj == NULL) {
 181                         obj = lfsck_object_find_bottom(env, lfsck, fid);
 182                         if (IS_ERR(obj))
 183                                 return PTR_ERR(obj);
 184
 185                         depth++;
 186                         if (!dt_object_exists(obj))
 187                                 GOTO(out, rc = 0);
 188                 }
 189
 190                 dt_read_lock(env, obj, MOR_TGT_CHILD);
 191                 if (unlikely(lfsck_is_dead_obj(obj))) {
 192                         dt_read_unlock(env, obj);
 193
 194                         GOTO(out, rc = 0);
 195                 }
 196
 197                 rc = dt_xattr_get(env, obj,
 198                                   lfsck_buf_get(env, NULL, 0), XATTR_NAME_LINK);
 199                 dt_read_unlock(env, obj);
 200                 if (rc >= 0)
 201                         GOTO(out, rc = 1);
 202
 203                 if (rc < 0 && rc != -ENODATA)
 204                         GOTO(out, rc);
 205
 206                 rc = lfsck_parent_fid(env, obj, fid);
 207                 if (depth > 0)
 208                         lfsck_object_put(env, obj);
 209
 210                 obj = NULL;
 211                 if (rc != 0)
 212                         return rc;
 213
 214                 if (!fid_is_sane(fid))
 215                         return 0;
 216         }
 217
 218 out:
 219         if (depth > 0 && obj != NULL)
 220                 lfsck_object_put(env, obj);
 221
 222         return rc;
 223 }
 224
 225 static int lfsck_load_stripe_lmv(const struct lu_env *env,
 226                                  struct lfsck_instance *lfsck,
 227                                  struct dt_object *obj)
 228 {
 229         struct lmv_mds_md_v1    *lmv    = &lfsck_env_info(env)->lti_lmv;
 230         struct lfsck_lmv        *llmv;
 231         int                      rc;
 232         ENTRY;
 233
 234         LASSERT(lfsck->li_obj_dir == NULL);
 235         LASSERT(lfsck->li_lmv == NULL);
 236
 237         rc = lfsck_read_stripe_lmv(env, obj, lmv);
 238         if (rc == -ENODATA) {
 239                 lfsck->li_obj_dir = lfsck_object_get(obj);
 240
 241                 RETURN(0);
 242         }
 243
 244         if (rc < 0)
 245                 RETURN(rc);
 246
 247         OBD_ALLOC_PTR(llmv);
 248         if (llmv == NULL)
 249                 RETURN(-ENOMEM);
 250
 251         if (lmv->lmv_magic == LMV_MAGIC) {
 252                 struct lfsck_slave_lmv_rec      *lslr;
 253                 __u32                            stripes;
 254
 255                 llmv->ll_lmv_master = 1;
 256                 if (lmv->lmv_stripe_count < 1)
 257                         stripes = LFSCK_LMV_DEF_STRIPES;
 258                 else if (lmv->lmv_stripe_count > LFSCK_LMV_MAX_STRIPES)
 259                         stripes = LFSCK_LMV_MAX_STRIPES;
 260                 else
 261                         stripes = lmv->lmv_stripe_count;
 262
 263                 OBD_ALLOC_LARGE(lslr, sizeof(*lslr) * stripes);
 264                 if (lslr == NULL) {
 265                         OBD_FREE_PTR(llmv);
 266
 267                         RETURN(-ENOMEM);
 268                 }
 269
 270                 llmv->ll_stripes_allocated = stripes;
 271                 llmv->ll_hash_type = LMV_HASH_TYPE_UNKNOWN;
 272                 llmv->ll_lslr = lslr;
 273         } else {
 274                 llmv->ll_lmv_slave = 1;
 275         }
 276
 277         lfsck->li_obj_dir = lfsck_object_get(obj);
 278         llmv->ll_lmv = *lmv;
 279         atomic_set(&llmv->ll_ref, 1);
 280         lfsck->li_lmv = llmv;
 281
 282         RETURN(0);
 283 }
 284
 285 /* LFSCK wrap functions */
 286
 287 static void lfsck_fail(const struct lu_env *env, struct lfsck_instance *lfsck,
 288                        bool new_checked)
 289 {
 290         struct lfsck_component *com;
 291
 292         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 293                 com->lc_ops->lfsck_fail(env, com, new_checked);
 294         }
 295 }
 296
 297 void lfsck_close_dir(const struct lu_env *env,
 298                      struct lfsck_instance *lfsck, int result)
 299 {
 300         struct lfsck_component *com;
 301         ENTRY;
 302
 303         if (lfsck->li_lmv != NULL) {
 304                 lfsck->li_lmv->ll_exit_value = result;
 305                 if (lfsck->li_obj_dir != NULL) {
 306                         list_for_each_entry(com, &lfsck->li_list_dir,
 307                                             lc_link_dir) {
 308                                 com->lc_ops->lfsck_close_dir(env, com);
 309                         }
 310                 }
 311
 312                 lfsck_lmv_put(env, lfsck->li_lmv);
 313                 lfsck->li_lmv = NULL;
 314         }
 315
 316         if (lfsck->li_di_dir != NULL) {
 317                 const struct dt_it_ops  *dir_iops;
 318                 struct dt_it            *dir_di   = lfsck->li_di_dir;
 319
 320                 LASSERT(lfsck->li_obj_dir != NULL);
 321
 322                 dir_iops = &lfsck->li_obj_dir->do_index_ops->dio_it;
 323                 lfsck_di_dir_put(env, lfsck);
 324                 dir_iops->fini(env, dir_di);
 325         }
 326
 327         if (lfsck->li_obj_dir != NULL) {
 328                 struct dt_object        *dir_obj  = lfsck->li_obj_dir;
 329
 330                 lfsck->li_obj_dir = NULL;
 331                 lfsck_object_put(env, dir_obj);
 332         }
 333
 334         EXIT;
 335 }
 336
 337 int lfsck_open_dir(const struct lu_env *env,
 338                    struct lfsck_instance *lfsck, __u64 cookie)
 339 {
 340         struct dt_object        *obj    = lfsck->li_obj_dir;
 341         struct dt_it            *di     = lfsck->li_di_dir;
 342         struct lfsck_component  *com;
 343         const struct dt_it_ops  *iops;
 344         int                      rc     = 0;
 345         ENTRY;
 346
 347         LASSERT(obj != NULL);
 348         LASSERT(di == NULL);
 349
 350         if (unlikely(!dt_try_as_dir(env, obj)))
 351                 GOTO(out, rc = -ENOTDIR);
 352
 353         list_for_each_entry(com, &lfsck->li_list_dir, lc_link_dir) {
 354                 rc = com->lc_ops->lfsck_open_dir(env, com);
 355                 if (rc != 0)
 356                         GOTO(out, rc);
 357         }
 358
 359         iops = &obj->do_index_ops->dio_it;
 360         di = iops->init(env, obj, lfsck->li_args_dir);
 361         if (IS_ERR(di))
 362                 GOTO(out, rc = PTR_ERR(di));
 363
 364         rc = iops->load(env, di, cookie);
 365         if (rc == -ENODATA)
 366                 rc = 1;
 367         else if (rc == 0 || (rc > 0 && cookie > 0))
 368                 rc = iops->next(env, di);
 369         else if (rc > 0)
 370                 rc = 0;
 371
 372         if (rc != 0) {
 373                 iops->put(env, di);
 374                 iops->fini(env, di);
 375         } else {
 376                 lfsck->li_cookie_dir = iops->store(env, di);
 377                 spin_lock(&lfsck->li_lock);
 378                 lfsck->li_di_dir = di;
 379                 spin_unlock(&lfsck->li_lock);
 380         }
 381
 382         GOTO(out, rc);
 383
 384 out:
 385         if (rc != 0)
 386                 lfsck_close_dir(env, lfsck, rc);
 387
 388         return rc;
 389 }
 390
 391 static int lfsck_checkpoint(const struct lu_env *env,
 392                             struct lfsck_instance *lfsck)
 393 {
 394         struct lfsck_component *com;
 395         int                     rc  = 0;
 396         int                     rc1 = 0;
 397
 398         if (likely(cfs_time_beforeq(cfs_time_current(),
 399                                     lfsck->li_time_next_checkpoint)))
 400                 return 0;
 401
 402         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
 403         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 404                 rc = com->lc_ops->lfsck_checkpoint(env, com, false);
 405                 if (rc != 0)
 406                         rc1 = rc;
 407         }
 408
 409         lfsck->li_time_last_checkpoint = cfs_time_current();
 410         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 411                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
 412         return rc1 != 0 ? rc1 : rc;
 413 }
 414
 415 static int lfsck_prep(const struct lu_env *env, struct lfsck_instance *lfsck,
 416                       struct lfsck_start_param *lsp)
 417 {
 418         struct dt_object       *obj     = NULL;
 419         struct lfsck_component *com;
 420         struct lfsck_component *next;
 421         struct lfsck_position  *pos     = NULL;
 422         const struct dt_it_ops *iops    =
 423                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
 424         int                     rc;
 425         ENTRY;
 426
 427         LASSERT(lfsck->li_obj_dir == NULL);
 428         LASSERT(lfsck->li_di_dir == NULL);
 429
 430         lfsck->li_current_oit_processed = 0;
 431         list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
 432                 com->lc_new_checked = 0;
 433                 rc = com->lc_ops->lfsck_prep(env, com, lsp);
 434                 if (rc != 0)
 435                         GOTO(out, rc);
 436
 437                 if ((pos == NULL) ||
 438                     (!lfsck_pos_is_zero(&com->lc_pos_start) &&
 439                      lfsck_pos_is_eq(pos, &com->lc_pos_start) > 0))
 440                         pos = &com->lc_pos_start;
 441         }
 442
 443         /* Init otable-based iterator. */
 444         if (pos == NULL) {
 445                 rc = iops->load(env, lfsck->li_di_oit, 0);
 446                 if (rc > 0 || unlikely(rc == -ENODATA)) {
 447                         lfsck->li_oit_over = 1;
 448                         rc = 0;
 449                 }
 450
 451                 GOTO(out, rc);
 452         }
 453
 454         rc = iops->load(env, lfsck->li_di_oit, pos->lp_oit_cookie);
 455         if (rc > 0 || unlikely(rc == -ENODATA))
 456                 lfsck->li_oit_over = 1;
 457         else if (rc < 0)
 458                 GOTO(out, rc);
 459
 460         if (!lfsck->li_master || fid_is_zero(&pos->lp_dir_parent))
 461                 GOTO(out, rc = 0);
 462
 463         /* Find the directory for namespace-based traverse. */
 464         obj = lfsck_object_find_bottom(env, lfsck, &pos->lp_dir_parent);
 465         if (IS_ERR(obj))
 466                 RETURN(PTR_ERR(obj));
 467
 468         /* Remote directory will be scanned by the LFSCK instance
 469          * on the MDT where the remote object really resides on. */
 470         if (!dt_object_exists(obj) || dt_object_remote(obj) ||
 471             unlikely(!S_ISDIR(lfsck_object_type(obj))))
 472                 GOTO(out, rc = 0);
 473
 474         rc = lfsck_load_stripe_lmv(env, lfsck, obj);
 475         if (rc == 0) {
 476                 /* For the master MDT-object of a striped directory,
 477                  * reset the iteration from the directory beginning. */
 478                 if (lfsck->li_lmv != NULL && lfsck->li_lmv->ll_lmv_master)
 479                         pos->lp_dir_cookie = 0;
 480
 481                 rc = lfsck_open_dir(env, lfsck, pos->lp_dir_cookie);
 482                 if (rc > 0)
 483                         /* The end of the directory. */
 484                         rc = 0;
 485         }
 486
 487         GOTO(out, rc);
 488
 489 out:
 490         if (obj != NULL)
 491                 lfsck_object_put(env, obj);
 492
 493         if (rc != 0) {
 494                 lfsck_close_dir(env, lfsck, rc);
 495                 list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
 496                                          lc_link) {
 497                         com->lc_ops->lfsck_post(env, com, rc, true);
 498                 }
 499
 500                 return rc;
 501         }
 502
 503         rc = 0;
 504         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, true);
 505         lfsck->li_pos_current = lfsck->li_pos_checkpoint;
 506         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 507                 rc = com->lc_ops->lfsck_checkpoint(env, com, true);
 508                 if (rc != 0)
 509                         break;
 510         }
 511
 512         lfsck->li_time_last_checkpoint = cfs_time_current();
 513         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 514                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
 515         return rc;
 516 }
 517
 518 static int lfsck_exec_oit(const struct lu_env *env,
 519                           struct lfsck_instance *lfsck, struct dt_object *obj)
 520 {
 521         struct lfsck_component *com;
 522         int                     rc;
 523         ENTRY;
 524
 525         LASSERT(lfsck->li_obj_dir == NULL);
 526
 527         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 528                 rc = com->lc_ops->lfsck_exec_oit(env, com, obj);
 529                 if (rc != 0)
 530                         RETURN(rc);
 531         }
 532
 533         rc = lfsck_needs_scan_dir(env, lfsck, obj);
 534         if (rc <= 0)
 535                 GOTO(out, rc);
 536
 537         rc = lfsck_load_stripe_lmv(env, lfsck, obj);
 538         if (rc == 0)
 539                 rc = lfsck_open_dir(env, lfsck, 0);
 540
 541         GOTO(out, rc);
 542
 543 out:
 544         if (rc < 0)
 545                 lfsck_fail(env, lfsck, false);
 546
 547         if (rc != 0)
 548                 lfsck_close_dir(env, lfsck, rc);
 549
 550         return rc > 0 ? 0 : rc;
 551 }
 552
 553 static int lfsck_exec_dir(const struct lu_env *env,
 554                           struct lfsck_instance *lfsck,
 555                           struct lfsck_assistant_object *lso,
 556                           struct lu_dirent *ent, __u16 type)
 557 {
 558         struct lfsck_component *com;
 559         int                     rc;
 560
 561         list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
 562                 rc = com->lc_ops->lfsck_exec_dir(env, com, lso, ent, type);
 563                 if (rc != 0)
 564                         return rc;
 565         }
 566         return 0;
 567 }
 568
 569 static int lfsck_master_dir_engine(const struct lu_env *env,
 570                                    struct lfsck_instance *lfsck);
 571
 572 static int lfsck_post(const struct lu_env *env, struct lfsck_instance *lfsck,
 573                       int result)
 574 {
 575         struct lfsck_component *com;
 576         struct lfsck_component *next;
 577         int                     rc  = result;
 578
 579         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
 580         lfsck_close_dir(env, lfsck, result);
 581
 582         while (thread_is_running(&lfsck->li_thread) && rc > 0 &&
 583                !list_empty(&lfsck->li_list_lmv)) {
 584                 struct lfsck_lmv_unit *llu;
 585
 586                 spin_lock(&lfsck->li_lock);
 587                 llu = list_entry(lfsck->li_list_lmv.next,
 588                                  struct lfsck_lmv_unit, llu_link);
 589                 list_del_init(&llu->llu_link);
 590                 spin_unlock(&lfsck->li_lock);
 591
 592                 lfsck->li_lmv = &llu->llu_lmv;
 593                 lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
 594                 rc = lfsck_open_dir(env, lfsck, 0);
 595                 if (rc == 0) {
 596                         rc = lfsck_master_dir_engine(env, lfsck);
 597                         lfsck_close_dir(env, lfsck, result);
 598                 }
 599         }
 600
 601         result = rc;
 602
 603         list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
 604                 rc = com->lc_ops->lfsck_post(env, com, result, false);
 605                 if (rc != 0)
 606                         CDEBUG(D_LFSCK, "%s: lfsck_post at the component %u: "
 607                                "rc = %d\n", lfsck_lfsck2name(lfsck),
 608                                (__u32)com->lc_type, rc);
 609         }
 610
 611         lfsck->li_time_last_checkpoint = cfs_time_current();
 612         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
 613                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
 614
 615         /* Ignore some component post failure to make other can go ahead. */
 616         return result;
 617 }
 618
 619 static int lfsck_double_scan(const struct lu_env *env,
 620                              struct lfsck_instance *lfsck)
 621 {
 622         struct lfsck_component *com;
 623         struct lfsck_component *next;
 624         struct l_wait_info      lwi = { 0 };
 625         int                     rc  = 0;
 626         int                     rc1 = 0;
 627
 628         list_for_each_entry(com, &lfsck->li_list_double_scan, lc_link) {
 629                 rc = com->lc_ops->lfsck_double_scan(env, com);
 630                 if (rc != 0)
 631                         rc1 = rc;
 632         }
 633
 634         l_wait_event(lfsck->li_thread.t_ctl_waitq,
 635                      atomic_read(&lfsck->li_double_scan_count) == 0,
 636                      &lwi);
 637
 638         if (lfsck->li_status != LS_PAUSED &&
 639             lfsck->li_status != LS_CO_PAUSED) {
 640                 list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
 641                                          lc_link) {
 642                         spin_lock(&lfsck->li_lock);
 643                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 644                         spin_unlock(&lfsck->li_lock);
 645                 }
 646         }
 647
 648         return rc1 != 0 ? rc1 : rc;
 649 }
 650
 651 static void lfsck_quit(const struct lu_env *env, struct lfsck_instance *lfsck)
 652 {
 653         struct lfsck_component *com;
 654         struct lfsck_component *next;
 655
 656         list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
 657                                  lc_link) {
 658                 if (com->lc_ops->lfsck_quit != NULL)
 659                         com->lc_ops->lfsck_quit(env, com);
 660
 661                 spin_lock(&lfsck->li_lock);
 662                 list_del_init(&com->lc_link_dir);
 663                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 664                 spin_unlock(&lfsck->li_lock);
 665         }
 666
 667         list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
 668                                  lc_link) {
 669                 if (com->lc_ops->lfsck_quit != NULL)
 670                         com->lc_ops->lfsck_quit(env, com);
 671
 672                 spin_lock(&lfsck->li_lock);
 673                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
 674                 spin_unlock(&lfsck->li_lock);
 675         }
 676 }
 677
 678 /* LFSCK engines */
 679
 680 static int lfsck_master_dir_engine(const struct lu_env *env,
 681                                    struct lfsck_instance *lfsck)
 682 {
 683         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 684         struct dt_object                *dir    = lfsck->li_obj_dir;
 685         const struct dt_it_ops          *iops   = &dir->do_index_ops->dio_it;
 686         struct dt_it                    *di     = lfsck->li_di_dir;
 687         struct lu_dirent                *ent    =
 688                         (struct lu_dirent *)info->lti_key;
 689         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
 690         struct ptlrpc_thread            *thread = &lfsck->li_thread;
 691         struct lfsck_assistant_object   *lso    = NULL;
 692         int                              rc;
 693         __u16                            type;
 694         ENTRY;
 695
 696         do {
 697                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY2, cfs_fail_val) &&
 698                     unlikely(!thread_is_running(thread))) {
 699                         CDEBUG(D_LFSCK, "%s: scan dir exit for engine stop, "
 700                                "parent "DFID", cookie %#llx\n",
 701                                lfsck_lfsck2name(lfsck),
 702                                PFID(lfsck_dto2fid(dir)), lfsck->li_cookie_dir);
 703
 704                         GOTO(out, rc = 0);
 705                 }
 706
 707                 lfsck->li_new_scanned++;
 708                 rc = iops->rec(env, di, (struct dt_rec *)ent,
 709                                lfsck->li_args_dir);
 710                 if (rc == 0)
 711                         rc = lfsck_unpack_ent(ent, &lfsck->li_cookie_dir,
 712                                               &type);
 713
 714                 if (rc != 0) {
 715                         CDEBUG(D_LFSCK, "%s: scan dir failed at rec(), "
 716                                "parent "DFID", cookie %#llx: rc = %d\n",
 717                                lfsck_lfsck2name(lfsck),
 718                                PFID(lfsck_dto2fid(dir)),
 719                                lfsck->li_cookie_dir, rc);
 720                         lfsck_fail(env, lfsck, true);
 721                         if (bk->lb_param & LPF_FAILOUT)
 722                                 GOTO(out, rc);
 723                         else
 724                                 goto checkpoint;
 725                 }
 726
 727                 if (ent->lde_attrs & LUDA_IGNORE)
 728                         goto checkpoint;
 729
 730                 /* skip dot entry. */
 731                 if (ent->lde_namelen == 1 && ent->lde_name[0] == '.')
 732                         goto checkpoint;
 733
 734                 if (lso == NULL) {
 735                         lso = lfsck_assistant_object_init(env,
 736                                 lfsck_dto2fid(dir), NULL,
 737                                 lfsck->li_pos_current.lp_oit_cookie, true);
 738                         if (IS_ERR(lso)) {
 739                                 if (bk->lb_param & LPF_FAILOUT)
 740                                         RETURN(PTR_ERR(lso));
 741
 742                                 lso = NULL;
 743                                 goto checkpoint;
 744                         }
 745                 }
 746
 747                 /* The type in the @ent structure may has been overwritten,
 748                  * so we need to pass the @type parameter independently. */
 749                 rc = lfsck_exec_dir(env, lfsck, lso, ent, type);
 750                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 751                         GOTO(out, rc);
 752
 753 checkpoint:
 754                 rc = lfsck_checkpoint(env, lfsck);
 755                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 756                         GOTO(out, rc);
 757
 758                 /* Rate control. */
 759                 lfsck_control_speed(lfsck);
 760                 if (unlikely(!thread_is_running(thread))) {
 761                         CDEBUG(D_LFSCK, "%s: scan dir exit for engine stop, "
 762                                "parent "DFID", cookie %#llx\n",
 763                                lfsck_lfsck2name(lfsck),
 764                                PFID(lfsck_dto2fid(dir)),
 765                                lfsck->li_cookie_dir);
 766                         GOTO(out, rc = 0);
 767                 }
 768
 769                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL2)) {
 770                         spin_lock(&lfsck->li_lock);
 771                         thread_set_flags(thread, SVC_STOPPING);
 772                         spin_unlock(&lfsck->li_lock);
 773                         GOTO(out, rc = -EINVAL);
 774                 }
 775
 776                 rc = iops->next(env, di);
 777                 if (rc < 0)
 778                         CDEBUG(D_LFSCK, "%s dir engine fail to locate next "
 779                                "for the directory "DFID": rc = %d\n",
 780                                lfsck_lfsck2name(lfsck),
 781                                PFID(&lfsck->li_pos_current.lp_dir_parent), rc);
 782         } while (rc == 0);
 783
 784         if (rc > 0 && !lfsck->li_oit_over)
 785                 lfsck_close_dir(env, lfsck, rc);
 786
 787         GOTO(out, rc);
 788
 789 out:
 790         if (lso != NULL)
 791                 lfsck_assistant_object_put(env, lso);
 792
 793         return rc;
 794 }
 795
 796 /**
 797  * Object-table based iteration engine.
 798  *
 799  * Object-table based iteration is the basic linear engine to scan all the
 800  * objects on current device in turn. For each object, it calls all the
 801  * registered LFSCK component(s)' API to perform related consistency
 802  * verification.
 803  *
 804  * It flushes related LFSCK trace files to disk via making checkpoint
 805  * periodically. Then if the server crashed or the LFSCK is paused, the
 806  * LFSCK can resume from the latest checkpoint.
 807  *
 808  * It also controls the whole LFSCK speed via lfsck_control_speed() to
 809  * avoid the server to become overload.
 810  *
 811  * \param[in] env       pointer to the thread context
 812  * \param[in] lfsck     pointer to the lfsck instance
 813  *
 814  * \retval              positive number if all objects have been scanned
 815  * \retval              0 if the iteration is stopped or paused
 816  * \retval              negative error number on failure
 817  */
 818 static int lfsck_master_oit_engine(const struct lu_env *env,
 819                                    struct lfsck_instance *lfsck)
 820 {
 821         struct lfsck_thread_info *info  = lfsck_env_info(env);
 822         const struct dt_it_ops   *iops  =
 823                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
 824         struct dt_it             *di    = lfsck->li_di_oit;
 825         struct lu_fid            *fid   = &info->lti_fid;
 826         struct lfsck_bookmark    *bk    = &lfsck->li_bookmark_ram;
 827         struct ptlrpc_thread     *thread = &lfsck->li_thread;
 828         struct seq_server_site   *ss    = lfsck_dev_site(lfsck);
 829         __u32                    idx    = lfsck_dev_idx(lfsck);
 830         int                      rc;
 831         ENTRY;
 832
 833         if (unlikely(ss == NULL))
 834                 RETURN(-EIO);
 835
 836         do {
 837                 struct dt_object *target;
 838
 839                 if (lfsck->li_di_dir != NULL) {
 840                         rc = lfsck_master_dir_engine(env, lfsck);
 841                         if (rc <= 0)
 842                                 RETURN(rc);
 843                 }
 844
 845                 if (unlikely(lfsck->li_oit_over))
 846                         RETURN(1);
 847
 848                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY1, cfs_fail_val) &&
 849                     unlikely(!thread_is_running(thread))) {
 850                         CDEBUG(D_LFSCK, "%s: OIT scan exit for engine stop, "
 851                                "cookie %llu\n",
 852                                lfsck_lfsck2name(lfsck), iops->store(env, di));
 853
 854                         RETURN(0);
 855                 }
 856
 857                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_CRASH))
 858                         RETURN(0);
 859
 860                 lfsck->li_current_oit_processed = 1;
 861
 862                 if (!list_empty(&lfsck->li_list_lmv)) {
 863                         struct lfsck_lmv_unit *llu;
 864
 865                         spin_lock(&lfsck->li_lock);
 866                         llu = list_entry(lfsck->li_list_lmv.next,
 867                                          struct lfsck_lmv_unit, llu_link);
 868                         list_del_init(&llu->llu_link);
 869                         spin_unlock(&lfsck->li_lock);
 870
 871                         lfsck->li_lmv = &llu->llu_lmv;
 872                         lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
 873                         rc = lfsck_open_dir(env, lfsck, 0);
 874                         if (rc == 0)
 875                                 rc = lfsck_master_dir_engine(env, lfsck);
 876
 877                         if (rc <= 0)
 878                                 RETURN(rc);
 879                 }
 880
 881                 lfsck->li_new_scanned++;
 882                 lfsck->li_pos_current.lp_oit_cookie = iops->store(env, di);
 883                 rc = iops->rec(env, di, (struct dt_rec *)fid, 0);
 884                 if (rc != 0) {
 885                         CDEBUG(D_LFSCK, "%s: OIT scan failed at rec(): "
 886                                "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 887                         lfsck_fail(env, lfsck, true);
 888                         if (rc < 0 && bk->lb_param & LPF_FAILOUT)
 889                                 RETURN(rc);
 890                         else
 891                                 goto checkpoint;
 892                 }
 893
 894                 if (unlikely(!fid_is_sane(fid))) {
 895                         CDEBUG(D_LFSCK, "%s: OIT scan find invalid FID "DFID
 896                                ", skip it\n",
 897                                lfsck_lfsck2name(lfsck), PFID(fid));
 898                         goto checkpoint;
 899                 }
 900
 901                 if (fid_is_idif(fid)) {
 902                         __u32 idx1 = fid_idif_ost_idx(fid);
 903
 904                         LASSERT(!lfsck->li_master);
 905
 906                         if (idx != idx1) {
 907                                 struct ost_id *oi = &info->lti_oi;
 908
 909                                 if (unlikely(idx1 != 0)) {
 910                                         CDEBUG(D_LFSCK, "%s: invalid IDIF "DFID
 911                                                ", not match device index %u\n",
 912                                                lfsck_lfsck2name(lfsck),
 913                                                PFID(fid), idx);
 914
 915                                         goto checkpoint;
 916                                 }
 917
 918                                 /* rebuild the IDIF with index to
 919                                  * avoid double instances for the
 920                                  * same object. */
 921                                 fid_to_ostid(fid, oi);
 922                                 ostid_to_fid(fid, oi, idx);
 923                         }
 924                 } else if (!fid_is_norm(fid) && !fid_is_igif(fid) &&
 925                            !fid_is_last_id(fid) &&
 926                            !lu_fid_eq(fid, &lfsck->li_global_root_fid)) {
 927
 928                         /* If the FID/object is only used locally and invisible
 929                          * to external nodes, then LFSCK will not handle it.
 930                          *
 931                          * dot_lustre sequence has been handled specially. */
 932                         goto checkpoint;
 933                 } else {
 934                         struct lu_seq_range *range = &info->lti_range;
 935
 936                         if (lfsck->li_master)
 937                                 fld_range_set_mdt(range);
 938                         else
 939                                 fld_range_set_ost(range);
 940                         rc = fld_local_lookup(env, ss->ss_server_fld,
 941                                               fid_seq(fid), range);
 942                         if (rc != 0 || range->lsr_index != idx) {
 943                                 /* Remote object will be handled by the LFSCK
 944                                  * instance on the MDT where the remote object
 945                                  * really resides on. */
 946                                 rc = 0;
 947                                 goto checkpoint;
 948                         }
 949                 }
 950
 951                 target = lfsck_object_find_bottom(env, lfsck, fid);
 952                 if (IS_ERR(target)) {
 953                         CDEBUG(D_LFSCK, "%s: OIT scan failed at find target "
 954                                DFID", cookie %llu: rc = %d\n",
 955                                lfsck_lfsck2name(lfsck), PFID(fid),
 956                                iops->store(env, di), rc);
 957                         lfsck_fail(env, lfsck, true);
 958                         if (bk->lb_param & LPF_FAILOUT)
 959                                 RETURN(PTR_ERR(target));
 960                         else
 961                                 goto checkpoint;
 962                 }
 963
 964                 if (dt_object_exists(target))
 965                         rc = lfsck_exec_oit(env, lfsck, target);
 966
 967                 lfsck_object_put(env, target);
 968                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 969                         RETURN(rc);
 970
 971 checkpoint:
 972                 rc = lfsck_checkpoint(env, lfsck);
 973                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
 974                         RETURN(rc);
 975
 976                 /* Rate control. */
 977                 lfsck_control_speed(lfsck);
 978
 979                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL1)) {
 980                         spin_lock(&lfsck->li_lock);
 981                         thread_set_flags(thread, SVC_STOPPING);
 982                         spin_unlock(&lfsck->li_lock);
 983                         RETURN(-EINVAL);
 984                 }
 985
 986                 rc = iops->next(env, di);
 987                 if (unlikely(rc > 0))
 988                         lfsck->li_oit_over = 1;
 989                 else if (likely(rc == 0))
 990                         lfsck->li_current_oit_processed = 0;
 991                 else
 992                         CDEBUG(D_LFSCK, "%s oit engine fail to locate next at "
 993                                "%llu: rc = %d\n", lfsck_lfsck2name(lfsck),
 994                                iops->store(env, di), rc);
 995
 996                 if (unlikely(!thread_is_running(thread))) {
 997                         CDEBUG(D_LFSCK, "%s: OIT scan exit for engine stop, "
 998                                "cookie %llu\n", lfsck_lfsck2name(lfsck),
 999                                iops->store(env, di));
1000                         RETURN(0);
1001                 }
1002         } while (rc == 0 || lfsck->li_di_dir != NULL);
1003
1004         RETURN(rc);
1005 }
1006
1007 int lfsck_master_engine(void *args)
1008 {
1009         struct lfsck_thread_args *lta      = args;
1010         struct lu_env            *env      = &lta->lta_env;
1011         struct lfsck_instance    *lfsck    = lta->lta_lfsck;
1012         struct ptlrpc_thread     *thread   = &lfsck->li_thread;
1013         struct dt_object         *oit_obj  = lfsck->li_obj_oit;
1014         const struct dt_it_ops   *oit_iops = &oit_obj->do_index_ops->dio_it;
1015         struct dt_it             *oit_di;
1016         struct l_wait_info        lwi      = { 0 };
1017         int                       rc;
1018         ENTRY;
1019
1020         /* There will be some objects verification during the LFSCK start,
1021          * such as the subsequent lfsck_verify_lpf(). Trigger low layer OI
1022          * OI scrub before that to handle the potential inconsistence. */
1023         oit_di = oit_iops->init(env, oit_obj, lfsck->li_args_oit);
1024         if (IS_ERR(oit_di)) {
1025                 rc = PTR_ERR(oit_di);
1026                 CDEBUG(D_LFSCK, "%s: master engine fail to init iteration: "
1027                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
1028
1029                 GOTO(fini_args, rc);
1030         }
1031
1032         if (lfsck->li_master &&
1033             (!list_empty(&lfsck->li_list_scan) ||
1034              !list_empty(&lfsck->li_list_double_scan))) {
1035                 rc = lfsck_verify_lpf(env, lfsck);
1036                 /* Fail to verify the .lustre/lost+found/MDTxxxx/ may be not
1037                  * fatal, because the .lustre/lost+found/ maybe not accessed
1038                  * by the LFSCK if it does not add orphans or others to such
1039                  * directory. So go ahead until hit failure when really uses
1040                  * the directory. */
1041                 if (rc != 0)
1042                         CDEBUG(D_LFSCK, "%s: master engine fail to verify the "
1043                                ".lustre/lost+found/, go ahead: rc = %d\n",
1044                                lfsck_lfsck2name(lfsck), 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 = %llu, dir_cookie = %#llx, 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         lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
1081         CDEBUG(D_LFSCK, "LFSCK exit: oit_flags = %#x, dir_flags = %#x, "
1082                "oit_cookie = %llu, dir_cookie = %#llx, parent = "DFID
1083                ", pid = %d, rc = %d\n", lfsck->li_args_oit, lfsck->li_args_dir,
1084                lfsck->li_pos_checkpoint.lp_oit_cookie,
1085                lfsck->li_pos_checkpoint.lp_dir_cookie,
1086                PFID(&lfsck->li_pos_checkpoint.lp_dir_parent),
1087                current_pid(), rc);
1088
1089         if (!OBD_FAIL_CHECK(OBD_FAIL_LFSCK_CRASH))
1090                 rc = lfsck_post(env, lfsck, rc);
1091         else
1092                 lfsck_close_dir(env, lfsck, rc);
1093
1094 fini_oit:
1095         lfsck_di_oit_put(env, lfsck);
1096         oit_iops->fini(env, oit_di);
1097         if (rc == 1) {
1098                 if (!list_empty(&lfsck->li_list_double_scan))
1099                         rc = lfsck_double_scan(env, lfsck);
1100                 else
1101                         rc = 0;
1102         } else {
1103                 lfsck_quit(env, lfsck);
1104         }
1105
1106         /* XXX: Purge the pinned objects in the future. */
1107
1108 fini_args:
1109         spin_lock(&lfsck->li_lock);
1110         thread_set_flags(thread, SVC_STOPPED);
1111         spin_unlock(&lfsck->li_lock);
1112         wake_up_all(&thread->t_ctl_waitq);
1113         lfsck_thread_args_fini(lta);
1114         return rc;
1115 }
1116
1117 static inline bool lfsck_assistant_req_empty(struct lfsck_assistant_data *lad)
1118 {
1119         bool empty = false;
1120
1121         spin_lock(&lad->lad_lock);
1122         if (list_empty(&lad->lad_req_list))
1123                 empty = true;
1124         spin_unlock(&lad->lad_lock);
1125
1126         return empty;
1127 }
1128
1129 /**
1130  * Query the LFSCK status from the instatnces on remote servers.
1131  *
1132  * The LFSCK assistant thread queries the LFSCK instances on other
1133  * servers (MDT/OST) about their status, such as whether they have
1134  * finished the phase1/phase2 scanning or not, and so on.
1135  *
1136  * \param[in] env       pointer to the thread context
1137  * \param[in] com       pointer to the lfsck component
1138  *
1139  * \retval              0 for success
1140  * \retval              negative error number on failure
1141  */
1142 static int lfsck_assistant_query_others(const struct lu_env *env,
1143                                         struct lfsck_component *com)
1144 {
1145         struct lfsck_thread_info          *info  = lfsck_env_info(env);
1146         struct lfsck_request              *lr    = &info->lti_lr;
1147         struct lfsck_async_interpret_args *laia  = &info->lti_laia;
1148         struct lfsck_instance             *lfsck = com->lc_lfsck;
1149         struct lfsck_assistant_data       *lad   = com->lc_data;
1150         struct ptlrpc_request_set         *set;
1151         struct lfsck_tgt_descs            *ltds;
1152         struct lfsck_tgt_desc             *ltd;
1153         struct list_head                  *phase_head;
1154         int                                rc    = 0;
1155         int                                rc1   = 0;
1156         ENTRY;
1157
1158         set = ptlrpc_prep_set();
1159         if (set == NULL)
1160                 RETURN(-ENOMEM);
1161
1162         lad->lad_touch_gen++;
1163         memset(lr, 0, sizeof(*lr));
1164         lr->lr_event = LE_QUERY;
1165         lr->lr_active = com->lc_type;
1166
1167         memset(laia, 0, sizeof(*laia));
1168         laia->laia_com = com;
1169         laia->laia_lr = lr;
1170
1171         if (!list_empty(&lad->lad_mdt_phase1_list)) {
1172                 ltds = &lfsck->li_mdt_descs;
1173                 lr->lr_flags = 0;
1174                 phase_head = &lad->lad_mdt_phase1_list;
1175         } else if (com->lc_type != LFSCK_TYPE_LAYOUT) {
1176                 goto out;
1177         } else {
1178
1179 again:
1180                 ltds = &lfsck->li_ost_descs;
1181                 lr->lr_flags = LEF_TO_OST;
1182                 phase_head = &lad->lad_ost_phase1_list;
1183         }
1184
1185         laia->laia_ltds = ltds;
1186         spin_lock(&ltds->ltd_lock);
1187         while (!list_empty(phase_head)) {
1188                 struct list_head *phase_list;
1189                 __u32            *gen;
1190
1191                 if (com->lc_type == LFSCK_TYPE_LAYOUT) {
1192                         ltd = list_entry(phase_head->next,
1193                                          struct lfsck_tgt_desc,
1194                                          ltd_layout_phase_list);
1195                         phase_list = &ltd->ltd_layout_phase_list;
1196                         gen = &ltd->ltd_layout_gen;
1197                 } else {
1198                         ltd = list_entry(phase_head->next,
1199                                          struct lfsck_tgt_desc,
1200                                          ltd_namespace_phase_list);
1201                         phase_list = &ltd->ltd_namespace_phase_list;
1202                         gen = &ltd->ltd_namespace_gen;
1203                 }
1204
1205                 if (*gen == lad->lad_touch_gen)
1206                         break;
1207
1208                 *gen = lad->lad_touch_gen;
1209                 list_move_tail(phase_list, phase_head);
1210                 atomic_inc(&ltd->ltd_ref);
1211                 laia->laia_ltd = ltd;
1212                 spin_unlock(&ltds->ltd_lock);
1213                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
1214                                          lfsck_async_interpret_common,
1215                                          laia, LFSCK_QUERY);
1216                 if (rc != 0) {
1217                         CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to query "
1218                                "%s %x for %s: rc = %d\n",
1219                                lfsck_lfsck2name(lfsck),
1220                                (lr->lr_flags & LEF_TO_OST) ? "OST" : "MDT",
1221                                ltd->ltd_index, lad->lad_name, rc);
1222                         lfsck_tgt_put(ltd);
1223                         rc1 = rc;
1224                 }
1225                 spin_lock(&ltds->ltd_lock);
1226         }
1227         spin_unlock(&ltds->ltd_lock);
1228
1229         rc = ptlrpc_set_wait(set);
1230         if (rc < 0) {
1231                 ptlrpc_set_destroy(set);
1232                 RETURN(rc);
1233         }
1234
1235         if (com->lc_type == LFSCK_TYPE_LAYOUT && !(lr->lr_flags & LEF_TO_OST) &&
1236             list_empty(&lad->lad_mdt_phase1_list))
1237                 goto again;
1238
1239 out:
1240         ptlrpc_set_destroy(set);
1241
1242         RETURN(rc1 != 0 ? rc1 : rc);
1243 }
1244
1245 /**
1246  * Notify the LFSCK event to the instances on remote servers.
1247  *
1248  * The LFSCK assistant thread notifies the LFSCK instances on other
1249  * servers (MDT/OST) about some events, such as start new scanning,
1250  * stop the scanning, this LFSCK instance will exit, and so on.
1251  *
1252  * \param[in] env       pointer to the thread context
1253  * \param[in] com       pointer to the lfsck component
1254  * \param[in] lr        pointer to the LFSCK event request
1255  *
1256  * \retval              0 for success
1257  * \retval              negative error number on failure
1258  */
1259 static int lfsck_assistant_notify_others(const struct lu_env *env,
1260                                          struct lfsck_component *com,
1261                                          struct lfsck_request *lr)
1262 {
1263         struct lfsck_thread_info          *info  = lfsck_env_info(env);
1264         struct lfsck_async_interpret_args *laia  = &info->lti_laia;
1265         struct lfsck_instance             *lfsck = com->lc_lfsck;
1266         struct lfsck_assistant_data       *lad   = com->lc_data;
1267         struct lfsck_bookmark             *bk    = &lfsck->li_bookmark_ram;
1268         struct ptlrpc_request_set         *set;
1269         struct lfsck_tgt_descs            *ltds;
1270         struct lfsck_tgt_desc             *ltd;
1271         struct lfsck_tgt_desc             *next;
1272         __u32                              idx;
1273         int                                rc    = 0;
1274         int                                rc1   = 0;
1275         ENTRY;
1276
1277         set = ptlrpc_prep_set();
1278         if (set == NULL)
1279                 RETURN(-ENOMEM);
1280
1281         lr->lr_index = lfsck_dev_idx(lfsck);
1282         lr->lr_active = com->lc_type;
1283
1284         memset(laia, 0, sizeof(*laia));
1285         laia->laia_com = com;
1286         laia->laia_lr = lr;
1287
1288         switch (lr->lr_event) {
1289         case LE_START:
1290                 if (com->lc_type != LFSCK_TYPE_LAYOUT)
1291                         goto next;
1292
1293                 lr->lr_valid = LSV_SPEED_LIMIT | LSV_ERROR_HANDLE | LSV_DRYRUN;
1294                 lr->lr_speed = bk->lb_speed_limit;
1295                 lr->lr_version = bk->lb_version;
1296                 lr->lr_param |= bk->lb_param;
1297                 lr->lr_async_windows = bk->lb_async_windows;
1298                 lr->lr_flags = LEF_TO_OST;
1299
1300                 /* Notify OSTs firstly, then handle other MDTs if needed. */
1301                 ltds = &lfsck->li_ost_descs;
1302                 laia->laia_ltds = ltds;
1303                 down_read(&ltds->ltd_rw_sem);
1304                 cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
1305                         ltd = lfsck_tgt_get(ltds, idx);
1306                         LASSERT(ltd != NULL);
1307
1308                         laia->laia_ltd = ltd;
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 = lfsck_ltd2tgt(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 = lfsck_ltd2tgt(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_synced_failures)
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         int                                rc2;
1573         ENTRY;
1574
1575         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread start\n",
1576                lfsck_lfsck2name(lfsck), lad->lad_name);
1577
1578         memset(lr, 0, sizeof(*lr));
1579         lr->lr_event = LE_START;
1580         if (pos->lp_oit_cookie <= 1)
1581                 lr->lr_param = LPF_RESET;
1582         rc = lfsck_assistant_notify_others(env, com, lr);
1583         if (rc != 0) {
1584                 CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to notify others "
1585                        "to start %s: rc = %d\n",
1586                        lfsck_lfsck2name(lfsck), lad->lad_name, rc);
1587                 GOTO(fini, rc);
1588         }
1589
1590         spin_lock(&lad->lad_lock);
1591         lad->lad_task = current;
1592         thread_set_flags(athread, SVC_RUNNING);
1593         spin_unlock(&lad->lad_lock);
1594         wake_up_all(&mthread->t_ctl_waitq);
1595
1596         while (1) {
1597                 while (!list_empty(&lad->lad_req_list)) {
1598                         bool wakeup = false;
1599
1600                         if (unlikely(lad->lad_exit ||
1601                                      !thread_is_running(mthread)))
1602                                 GOTO(cleanup, rc = lad->lad_post_result);
1603
1604                         lar = list_entry(lad->lad_req_list.next,
1605                                          struct lfsck_assistant_req,
1606                                          lar_list);
1607                         /* Only the lfsck_assistant_engine thread itself can
1608                          * remove the "lar" from the head of the list, LFSCK
1609                          * engine thread only inserts other new "lar" at the
1610                          * end of the list. So it is safe to handle current
1611                          * "lar" without the spin_lock. */
1612                         rc = lao->la_handler_p1(env, com, lar);
1613                         spin_lock(&lad->lad_lock);
1614                         list_del_init(&lar->lar_list);
1615                         lad->lad_prefetched--;
1616                         /* Wake up the main engine thread only when the list
1617                          * is empty or half of the prefetched items have been
1618                          * handled to avoid too frequent thread schedule. */
1619                         if (lad->lad_prefetched <= (bk->lb_async_windows / 2))
1620                                 wakeup = true;
1621                         spin_unlock(&lad->lad_lock);
1622                         if (wakeup)
1623                                 wake_up_all(&mthread->t_ctl_waitq);
1624
1625                         lao->la_req_fini(env, lar);
1626                         if (rc < 0 && bk->lb_param & LPF_FAILOUT)
1627                                 GOTO(cleanup, rc);
1628                 }
1629
1630                 l_wait_event(athread->t_ctl_waitq,
1631                              !lfsck_assistant_req_empty(lad) ||
1632                              lad->lad_exit ||
1633                              lad->lad_to_post ||
1634                              lad->lad_to_double_scan,
1635                              &lwi);
1636
1637                 if (unlikely(lad->lad_exit))
1638                         GOTO(cleanup, rc = lad->lad_post_result);
1639
1640                 if (!list_empty(&lad->lad_req_list))
1641                         continue;
1642
1643                 if (lad->lad_to_post) {
1644                         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread post\n",
1645                                lfsck_lfsck2name(lfsck), lad->lad_name);
1646
1647                         if (unlikely(lad->lad_exit))
1648                                 GOTO(cleanup, rc = lad->lad_post_result);
1649
1650                         lad->lad_to_post = 0;
1651                         LASSERT(lad->lad_post_result > 0);
1652
1653                         /* Wakeup the master engine to go ahead. */
1654                         wake_up_all(&mthread->t_ctl_waitq);
1655
1656                         memset(lr, 0, sizeof(*lr));
1657                         lr->lr_event = LE_PHASE1_DONE;
1658                         lr->lr_status = lad->lad_post_result;
1659                         rc = lfsck_assistant_notify_others(env, com, lr);
1660
1661                         CDEBUG(D_LFSCK, "%s: LFSCK assistant notified "
1662                                "others for %s post: rc = %d\n",
1663                                lfsck_lfsck2name(lfsck),
1664                                lad->lad_name, rc);
1665                 }
1666
1667                 if (lad->lad_to_double_scan) {
1668                         lad->lad_to_double_scan = 0;
1669                         atomic_inc(&lfsck->li_double_scan_count);
1670                         lad->lad_in_double_scan = 1;
1671                         wake_up_all(&mthread->t_ctl_waitq);
1672
1673                         com->lc_new_checked = 0;
1674                         com->lc_new_scanned = 0;
1675                         com->lc_time_last_checkpoint = cfs_time_current();
1676                         com->lc_time_next_checkpoint =
1677                                 com->lc_time_last_checkpoint +
1678                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
1679
1680                         CDEBUG(D_LFSCK, "%s: LFSCK assistant sync before "
1681                                "the second-stage scaning\n",
1682                                lfsck_lfsck2name(lfsck));
1683
1684                         /* Flush async updates before handling orphan. */
1685                         rc2 = dt_sync(env, lfsck->li_next);
1686
1687                         CDEBUG(D_LFSCK, "%s: LFSCK assistant phase2 "
1688                                "scan start, synced: rc = %d\n",
1689                                lfsck_lfsck2name(lfsck), rc2);
1690
1691                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_NO_DOUBLESCAN))
1692                                 GOTO(cleanup, rc = 0);
1693
1694                         while (lad->lad_in_double_scan) {
1695                                 rc = lfsck_assistant_query_others(env, com);
1696                                 if (lfsck_phase2_next_ready(lad))
1697                                         goto p2_next;
1698
1699                                 if (rc < 0)
1700                                         GOTO(cleanup, rc);
1701
1702                                 /* Pull LFSCK status on related targets once
1703                                  * per 30 seconds if we are not notified. */
1704                                 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(30),
1705                                                            cfs_time_seconds(1),
1706                                                            NULL, NULL);
1707                                 rc = l_wait_event(athread->t_ctl_waitq,
1708                                         lfsck_phase2_next_ready(lad) ||
1709                                         lad->lad_exit ||
1710                                         !thread_is_running(mthread),
1711                                         &lwi);
1712
1713                                 if (unlikely(lad->lad_exit ||
1714                                              !thread_is_running(mthread)))
1715                                         GOTO(cleanup, rc = 0);
1716
1717                                 if (rc == -ETIMEDOUT)
1718                                         continue;
1719
1720                                 if (rc < 0)
1721                                         GOTO(cleanup, rc);
1722
1723 p2_next:
1724                                 rc = lao->la_handler_p2(env, com);
1725                                 if (rc != 0)
1726                                         GOTO(cleanup, rc);
1727
1728                                 if (unlikely(lad->lad_exit ||
1729                                              !thread_is_running(mthread)))
1730                                         GOTO(cleanup, rc = 0);
1731                         }
1732                 }
1733         }
1734
1735 cleanup:
1736         /* Cleanup the unfinished requests. */
1737         spin_lock(&lad->lad_lock);
1738         if (rc < 0)
1739                 lad->lad_assistant_status = rc;
1740
1741         if (lad->lad_exit && lad->lad_post_result <= 0)
1742                 lao->la_fill_pos(env, com, &lfsck->li_pos_checkpoint);
1743
1744         thread_set_flags(athread, SVC_STOPPING);
1745         while (!list_empty(&lad->lad_req_list)) {
1746                 lar = list_entry(lad->lad_req_list.next,
1747                                  struct lfsck_assistant_req,
1748                                  lar_list);
1749                 list_del_init(&lar->lar_list);
1750                 lad->lad_prefetched--;
1751                 spin_unlock(&lad->lad_lock);
1752                 lao->la_req_fini(env, lar);
1753                 spin_lock(&lad->lad_lock);
1754         }
1755         spin_unlock(&lad->lad_lock);
1756
1757         LASSERTF(lad->lad_prefetched == 0, "unmatched prefeteched objs %d\n",
1758                  lad->lad_prefetched);
1759
1760         memset(lr, 0, sizeof(*lr));
1761         if (rc > 0) {
1762                 lr->lr_event = LE_PHASE2_DONE;
1763                 lr->lr_status = rc;
1764         } else if (rc == 0) {
1765                 if (lfsck->li_flags & LPF_ALL_TGT) {
1766                         lr->lr_event = LE_STOP;
1767                         lr->lr_status = LS_STOPPED;
1768                 } else {
1769                         lr->lr_event = LE_PEER_EXIT;
1770                         switch (lfsck->li_status) {
1771                         case LS_PAUSED:
1772                         case LS_CO_PAUSED:
1773                                 lr->lr_status = LS_CO_PAUSED;
1774                                 break;
1775                         case LS_STOPPED:
1776                         case LS_CO_STOPPED:
1777                                 lr->lr_status = LS_CO_STOPPED;
1778                                 break;
1779                         default:
1780                                 CDEBUG(D_LFSCK, "%s: LFSCK assistant unknown "
1781                                        "status: rc = %d\n",
1782                                        lfsck_lfsck2name(lfsck),
1783                                        lfsck->li_status);
1784                                 lr->lr_status = LS_CO_FAILED;
1785                                 break;
1786                         }
1787                 }
1788         } else {
1789                 if (lfsck->li_flags & LPF_ALL_TGT) {
1790                         lr->lr_event = LE_STOP;
1791                         lr->lr_status = LS_FAILED;
1792                 } else {
1793                         lr->lr_event = LE_PEER_EXIT;
1794                         lr->lr_status = LS_CO_FAILED;
1795                 }
1796         }
1797
1798         rc1 = lfsck_assistant_notify_others(env, com, lr);
1799         if (rc1 != 0) {
1800                 CDEBUG(D_LFSCK, "%s: LFSCK assistant failed to notify "
1801                        "others for %s quit: rc = %d\n",
1802                        lfsck_lfsck2name(lfsck), lad->lad_name, rc1);
1803                 rc = rc1;
1804         }
1805
1806         CDEBUG(D_LFSCK, "%s: LFSCK assistant sync before exit\n",
1807                lfsck_lfsck2name(lfsck));
1808
1809         /* Flush async updates before exit. */
1810         rc2 = dt_sync(env, lfsck->li_next);
1811
1812         CDEBUG(D_LFSCK, "%s: LFSCK assistant synced before exit: rc = %d\n",
1813                lfsck_lfsck2name(lfsck), rc2);
1814
1815         /* Under force exit case, some requests may be just freed without
1816          * verification, those objects should be re-handled when next run.
1817          * So not update the on-disk trace file under such case. */
1818         if (lad->lad_in_double_scan) {
1819                 if (!lad->lad_exit)
1820                         rc1 = lao->la_double_scan_result(env, com, rc);
1821
1822                 CDEBUG(D_LFSCK, "%s: LFSCK assistant phase2 scan "
1823                        "finished: rc = %d\n",
1824                        lfsck_lfsck2name(lfsck), rc1 != 0 ? rc1 : rc);
1825         }
1826
1827 fini:
1828         if (lad->lad_in_double_scan)
1829                 atomic_dec(&lfsck->li_double_scan_count);
1830
1831         spin_lock(&lad->lad_lock);
1832         lad->lad_assistant_status = (rc1 != 0 ? rc1 : rc);
1833         thread_set_flags(athread, SVC_STOPPED);
1834         wake_up_all(&mthread->t_ctl_waitq);
1835         lad->lad_task = NULL;
1836         spin_unlock(&lad->lad_lock);
1837
1838         CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread exit: rc = %d\n",
1839                lfsck_lfsck2name(lfsck), lad->lad_name,
1840                lad->lad_assistant_status);
1841
1842         lfsck_thread_args_fini(lta);
1843
1844         return rc;
1845 }