lustre/lfsck/lfsck_layout.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) 2014, Intel Corporation.
  24  */
  25 /*
  26  * lustre/lfsck/lfsck_layout.c
  27  *
  28  * Author: Fan, Yong <fan.yong@intel.com>
  29  */
  30
  31 #ifndef EXPORT_SYMTAB
  32 # define EXPORT_SYMTAB
  33 #endif
  34 #define DEBUG_SUBSYSTEM S_LFSCK
  35
  36 #include <linux/bitops.h>
  37 #include <linux/rbtree.h>
  38
  39 #include <lustre/lustre_idl.h>
  40 #include <lu_object.h>
  41 #include <dt_object.h>
  42 #include <lustre_fid.h>
  43 #include <lustre_lib.h>
  44 #include <lustre_net.h>
  45 #include <lustre/lustre_user.h>
  46 #include <md_object.h>
  47 #include <obd_class.h>
  48
  49 #include "lfsck_internal.h"
  50
  51 #define LFSCK_LAYOUT_MAGIC_V1           0xB173AE14
  52 #define LFSCK_LAYOUT_MAGIC_V2           0xB1734D76
  53
  54 #define LFSCK_LAYOUT_MAGIC              LFSCK_LAYOUT_MAGIC_V2
  55
  56 struct lfsck_layout_seq {
  57         struct list_head         lls_list;
  58         __u64                    lls_seq;
  59         __u64                    lls_lastid;
  60         __u64                    lls_lastid_known;
  61         struct dt_object        *lls_lastid_obj;
  62         unsigned int             lls_dirty:1;
  63 };
  64
  65 struct lfsck_layout_slave_target {
  66         /* link into lfsck_layout_slave_data::llsd_master_list. */
  67         struct list_head        llst_list;
  68         /* The position for next record in the rbtree for iteration. */
  69         struct lu_fid           llst_fid;
  70         /* Dummy hash for iteration against the rbtree. */
  71         __u64                   llst_hash;
  72         __u64                   llst_gen;
  73         atomic_t                llst_ref;
  74         __u32                   llst_index;
  75 };
  76
  77 struct lfsck_layout_slave_data {
  78         /* list for lfsck_layout_seq */
  79         struct list_head         llsd_seq_list;
  80
  81         /* list for the masters involve layout verification. */
  82         struct list_head         llsd_master_list;
  83         spinlock_t               llsd_lock;
  84         __u64                    llsd_touch_gen;
  85         struct dt_object        *llsd_rb_obj;
  86         struct rb_root           llsd_rb_root;
  87         rwlock_t                 llsd_rb_lock;
  88         unsigned int             llsd_rbtree_valid:1;
  89 };
  90
  91 struct lfsck_layout_slave_async_args {
  92         struct obd_export                *llsaa_exp;
  93         struct lfsck_component           *llsaa_com;
  94         struct lfsck_layout_slave_target *llsaa_llst;
  95 };
  96
  97 static inline void
  98 lfsck_layout_llst_put(struct lfsck_layout_slave_target *llst)
  99 {
 100         if (atomic_dec_and_test(&llst->llst_ref)) {
 101                 LASSERT(list_empty(&llst->llst_list));
 102
 103                 OBD_FREE_PTR(llst);
 104         }
 105 }
 106
 107 static inline int
 108 lfsck_layout_llst_add(struct lfsck_layout_slave_data *llsd, __u32 index)
 109 {
 110         struct lfsck_layout_slave_target *llst;
 111         struct lfsck_layout_slave_target *tmp;
 112         int                               rc   = 0;
 113
 114         OBD_ALLOC_PTR(llst);
 115         if (llst == NULL)
 116                 return -ENOMEM;
 117
 118         INIT_LIST_HEAD(&llst->llst_list);
 119         llst->llst_gen = 0;
 120         llst->llst_index = index;
 121         atomic_set(&llst->llst_ref, 1);
 122
 123         spin_lock(&llsd->llsd_lock);
 124         list_for_each_entry(tmp, &llsd->llsd_master_list, llst_list) {
 125                 if (tmp->llst_index == index) {
 126                         rc = -EALREADY;
 127                         break;
 128                 }
 129         }
 130         if (rc == 0)
 131                 list_add_tail(&llst->llst_list, &llsd->llsd_master_list);
 132         spin_unlock(&llsd->llsd_lock);
 133
 134         if (rc != 0)
 135                 OBD_FREE_PTR(llst);
 136
 137         return rc;
 138 }
 139
 140 static inline void
 141 lfsck_layout_llst_del(struct lfsck_layout_slave_data *llsd,
 142                       struct lfsck_layout_slave_target *llst)
 143 {
 144         bool del = false;
 145
 146         spin_lock(&llsd->llsd_lock);
 147         if (!list_empty(&llst->llst_list)) {
 148                 list_del_init(&llst->llst_list);
 149                 del = true;
 150         }
 151         spin_unlock(&llsd->llsd_lock);
 152
 153         if (del)
 154                 lfsck_layout_llst_put(llst);
 155 }
 156
 157 static inline struct lfsck_layout_slave_target *
 158 lfsck_layout_llst_find_and_del(struct lfsck_layout_slave_data *llsd,
 159                                __u32 index, bool unlink)
 160 {
 161         struct lfsck_layout_slave_target *llst;
 162
 163         spin_lock(&llsd->llsd_lock);
 164         list_for_each_entry(llst, &llsd->llsd_master_list, llst_list) {
 165                 if (llst->llst_index == index) {
 166                         if (unlink)
 167                                 list_del_init(&llst->llst_list);
 168                         else
 169                                 atomic_inc(&llst->llst_ref);
 170                         spin_unlock(&llsd->llsd_lock);
 171
 172                         return llst;
 173                 }
 174         }
 175         spin_unlock(&llsd->llsd_lock);
 176
 177         return NULL;
 178 }
 179
 180 static struct lfsck_layout_req *
 181 lfsck_layout_assistant_req_init(struct lfsck_assistant_object *lso,
 182                                 struct dt_object *child, __u32 ost_idx,
 183                                 __u32 lov_idx)
 184 {
 185         struct lfsck_layout_req *llr;
 186
 187         OBD_ALLOC_PTR(llr);
 188         if (llr == NULL)
 189                 return ERR_PTR(-ENOMEM);
 190
 191         INIT_LIST_HEAD(&llr->llr_lar.lar_list);
 192         llr->llr_lar.lar_parent = lfsck_assistant_object_get(lso);
 193         llr->llr_child = child;
 194         llr->llr_ost_idx = ost_idx;
 195         llr->llr_lov_idx = lov_idx;
 196
 197         return llr;
 198 }
 199
 200 static void lfsck_layout_assistant_req_fini(const struct lu_env *env,
 201                                             struct lfsck_assistant_req *lar)
 202 {
 203         struct lfsck_layout_req *llr =
 204                         container_of0(lar, struct lfsck_layout_req, llr_lar);
 205
 206         lfsck_object_put(env, llr->llr_child);
 207         lfsck_assistant_object_put(env, lar->lar_parent);
 208         OBD_FREE_PTR(llr);
 209 }
 210
 211 static int
 212 lfsck_layout_assistant_sync_failures_interpret(const struct lu_env *env,
 213                                                struct ptlrpc_request *req,
 214                                                void *args, int rc)
 215 {
 216         if (rc == 0) {
 217                 struct lfsck_async_interpret_args *laia = args;
 218                 struct lfsck_tgt_desc             *ltd  = laia->laia_ltd;
 219
 220                 ltd->ltd_synced_failures = 1;
 221                 atomic_dec(laia->laia_count);
 222         }
 223
 224         return 0;
 225 }
 226
 227 /**
 228  * Notify remote LFSCK instances about former failures.
 229  *
 230  * The local LFSCK instance has recorded which OSTs have ever failed to respond
 231  * some LFSCK verification requests (maybe because of network issues or the OST
 232  * itself trouble). During the respond gap, the OST may missed some OST-objects
 233  * verification, then the OST cannot know whether related OST-objects have been
 234  * referenced by related MDT-objects or not, then in the second-stage scanning,
 235  * these OST-objects will be regarded as orphan, if the OST-object contains bad
 236  * parent FID for back reference, then it will misguide the LFSCK to make wrong
 237  * fixing for the fake orphan.
 238  *
 239  * To avoid above trouble, when layout LFSCK finishes the first-stage scanning,
 240  * it will scan the bitmap for the ever failed OSTs, and notify them that they
 241  * have ever missed some OST-object verification and should skip the handling
 242  * for orphan OST-objects on all MDTs that are in the layout LFSCK.
 243  *
 244  * \param[in] env       pointer to the thread context
 245  * \param[in] com       pointer to the lfsck component
 246  * \param[in] lr        pointer to the lfsck request
 247  */
 248 static void lfsck_layout_assistant_sync_failures(const struct lu_env *env,
 249                                                  struct lfsck_component *com,
 250                                                  struct lfsck_request *lr)
 251 {
 252         struct lfsck_async_interpret_args *laia  =
 253                                 &lfsck_env_info(env)->lti_laia2;
 254         struct lfsck_assistant_data       *lad   = com->lc_data;
 255         struct lfsck_layout               *lo    = com->lc_file_ram;
 256         struct lfsck_instance             *lfsck = com->lc_lfsck;
 257         struct lfsck_tgt_descs            *ltds  = &lfsck->li_ost_descs;
 258         struct lfsck_tgt_desc             *ltd;
 259         struct ptlrpc_request_set         *set;
 260         atomic_t                           count;
 261         __u32                              idx;
 262         int                                rc    = 0;
 263         ENTRY;
 264
 265         if (!lad->lad_incomplete || lo->ll_flags & LF_INCOMPLETE)
 266                 RETURN_EXIT;
 267
 268         /* If the MDT has ever failed to verfiy some OST-objects,
 269          * then sync failures with them firstly. */
 270         lr->lr_flags2 = lo->ll_flags | LF_INCOMPLETE;
 271
 272         atomic_set(&count, 0);
 273         memset(laia, 0, sizeof(*laia));
 274         laia->laia_count = &count;
 275         set = ptlrpc_prep_set();
 276         if (set == NULL)
 277                 GOTO(out, rc = -ENOMEM);
 278
 279         down_read(&ltds->ltd_rw_sem);
 280         cfs_foreach_bit(lad->lad_bitmap, idx) {
 281                 ltd = lfsck_ltd2tgt(ltds, idx);
 282                 LASSERT(ltd != NULL);
 283
 284                 laia->laia_ltd = ltd;
 285                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
 286                                 lfsck_layout_assistant_sync_failures_interpret,
 287                                 laia, LFSCK_NOTIFY);
 288                 if (rc != 0) {
 289                         CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
 290                                "notify target %x for %s phase1 done: "
 291                                "rc = %d\n", lfsck_lfsck2name(com->lc_lfsck),
 292                                ltd->ltd_index, lad->lad_name, rc);
 293
 294                         break;
 295                 }
 296
 297                 atomic_inc(&count);
 298         }
 299         up_read(&ltds->ltd_rw_sem);
 300
 301         if (rc == 0 && atomic_read(&count) > 0)
 302                 rc = ptlrpc_set_wait(set);
 303
 304         ptlrpc_set_destroy(set);
 305
 306         if (rc == 0 && atomic_read(&count) > 0)
 307                 rc = -EINVAL;
 308
 309         GOTO(out, rc);
 310
 311 out:
 312         if (rc != 0)
 313                 /* If failed to sync failures with the OSTs, then have to
 314                  * mark the whole LFSCK as LF_INCOMPLETE to skip the whole
 315                  * subsequent orphan OST-object handling. */
 316                 lo->ll_flags |= LF_INCOMPLETE;
 317
 318         lr->lr_flags2 = lo->ll_flags;
 319 }
 320
 321 static int lfsck_layout_get_lovea(const struct lu_env *env,
 322                                   struct dt_object *obj, struct lu_buf *buf)
 323 {
 324         int rc;
 325
 326 again:
 327         rc = dt_xattr_get(env, obj, buf, XATTR_NAME_LOV);
 328         if (rc == -ERANGE) {
 329                 rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LOV);
 330                 if (rc <= 0)
 331                         return rc;
 332
 333                 lu_buf_realloc(buf, rc);
 334                 if (buf->lb_buf == NULL)
 335                         return -ENOMEM;
 336
 337                 goto again;
 338         }
 339
 340         if (rc == -ENODATA)
 341                 rc = 0;
 342
 343         if (rc <= 0)
 344                 return rc;
 345
 346         if (unlikely(buf->lb_buf == NULL)) {
 347                 lu_buf_alloc(buf, rc);
 348                 if (buf->lb_buf == NULL)
 349                         return -ENOMEM;
 350
 351                 goto again;
 352         }
 353
 354         return rc;
 355 }
 356
 357 static int lfsck_layout_verify_header(struct lov_mds_md_v1 *lmm)
 358 {
 359         __u32 magic;
 360         __u32 pattern;
 361
 362         magic = le32_to_cpu(lmm->lmm_magic);
 363         /* If magic crashed, keep it there. Sometime later, during OST-object
 364          * orphan handling, if some OST-object(s) back-point to it, it can be
 365          * verified and repaired. */
 366         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3) {
 367                 struct ost_id   oi;
 368                 int             rc;
 369
 370                 lmm_oi_le_to_cpu(&oi, &lmm->lmm_oi);
 371                 if ((magic & LOV_MAGIC_MASK) == LOV_MAGIC_MAGIC)
 372                         rc = -EOPNOTSUPP;
 373                 else
 374                         rc = -EINVAL;
 375
 376                 CDEBUG(D_LFSCK, "%s LOV EA magic %u on "DOSTID"\n",
 377                        rc == -EINVAL ? "Unknown" : "Unsupported",
 378                        magic, POSTID(&oi));
 379
 380                 return rc;
 381         }
 382
 383         pattern = le32_to_cpu(lmm->lmm_pattern);
 384         /* XXX: currently, we only support LOV_PATTERN_RAID0. */
 385         if (lov_pattern(pattern) != LOV_PATTERN_RAID0) {
 386                 struct ost_id oi;
 387
 388                 lmm_oi_le_to_cpu(&oi, &lmm->lmm_oi);
 389                 CDEBUG(D_LFSCK, "Unsupported LOV EA pattern %u on "DOSTID"\n",
 390                        pattern, POSTID(&oi));
 391
 392                 return -EOPNOTSUPP;
 393         }
 394
 395         return 0;
 396 }
 397
 398 #define LFSCK_RBTREE_BITMAP_SIZE        PAGE_CACHE_SIZE
 399 #define LFSCK_RBTREE_BITMAP_WIDTH       (LFSCK_RBTREE_BITMAP_SIZE << 3)
 400 #define LFSCK_RBTREE_BITMAP_MASK        (LFSCK_RBTREE_BITMAP_WIDTH - 1)
 401
 402 struct lfsck_rbtree_node {
 403         struct rb_node   lrn_node;
 404         __u64            lrn_seq;
 405         __u32            lrn_first_oid;
 406         atomic_t         lrn_known_count;
 407         atomic_t         lrn_accessed_count;
 408         void            *lrn_known_bitmap;
 409         void            *lrn_accessed_bitmap;
 410 };
 411
 412 static inline int lfsck_rbtree_cmp(struct lfsck_rbtree_node *lrn,
 413                                    __u64 seq, __u32 oid)
 414 {
 415         if (seq < lrn->lrn_seq)
 416                 return -1;
 417
 418         if (seq > lrn->lrn_seq)
 419                 return 1;
 420
 421         if (oid < lrn->lrn_first_oid)
 422                 return -1;
 423
 424         if (oid - lrn->lrn_first_oid >= LFSCK_RBTREE_BITMAP_WIDTH)
 425                 return 1;
 426
 427         return 0;
 428 }
 429
 430 /* The caller should hold llsd->llsd_rb_lock. */
 431 static struct lfsck_rbtree_node *
 432 lfsck_rbtree_search(struct lfsck_layout_slave_data *llsd,
 433                     const struct lu_fid *fid, bool *exact)
 434 {
 435         struct rb_node           *node  = llsd->llsd_rb_root.rb_node;
 436         struct rb_node           *prev  = NULL;
 437         struct lfsck_rbtree_node *lrn   = NULL;
 438         int                       rc    = 0;
 439
 440         if (exact != NULL)
 441                 *exact = true;
 442
 443         while (node != NULL) {
 444                 prev = node;
 445                 lrn = rb_entry(node, struct lfsck_rbtree_node, lrn_node);
 446                 rc = lfsck_rbtree_cmp(lrn, fid_seq(fid), fid_oid(fid));
 447                 if (rc < 0)
 448                         node = node->rb_left;
 449                 else if (rc > 0)
 450                         node = node->rb_right;
 451                 else
 452                         return lrn;
 453         }
 454
 455         if (exact == NULL)
 456                 return NULL;
 457
 458         /* If there is no exactly matched one, then to the next valid one. */
 459         *exact = false;
 460
 461         /* The rbtree is empty. */
 462         if (rc == 0)
 463                 return NULL;
 464
 465         if (rc < 0)
 466                 return lrn;
 467
 468         node = rb_next(prev);
 469
 470         /* The end of the rbtree. */
 471         if (node == NULL)
 472                 return NULL;
 473
 474         lrn = rb_entry(node, struct lfsck_rbtree_node, lrn_node);
 475
 476         return lrn;
 477 }
 478
 479 static struct lfsck_rbtree_node *lfsck_rbtree_new(const struct lu_env *env,
 480                                                   const struct lu_fid *fid)
 481 {
 482         struct lfsck_rbtree_node *lrn;
 483
 484         OBD_ALLOC_PTR(lrn);
 485         if (lrn == NULL)
 486                 return ERR_PTR(-ENOMEM);
 487
 488         OBD_ALLOC(lrn->lrn_known_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 489         if (lrn->lrn_known_bitmap == NULL) {
 490                 OBD_FREE_PTR(lrn);
 491
 492                 return ERR_PTR(-ENOMEM);
 493         }
 494
 495         OBD_ALLOC(lrn->lrn_accessed_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 496         if (lrn->lrn_accessed_bitmap == NULL) {
 497                 OBD_FREE(lrn->lrn_known_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 498                 OBD_FREE_PTR(lrn);
 499
 500                 return ERR_PTR(-ENOMEM);
 501         }
 502
 503         RB_CLEAR_NODE(&lrn->lrn_node);
 504         lrn->lrn_seq = fid_seq(fid);
 505         lrn->lrn_first_oid = fid_oid(fid) & ~LFSCK_RBTREE_BITMAP_MASK;
 506         atomic_set(&lrn->lrn_known_count, 0);
 507         atomic_set(&lrn->lrn_accessed_count, 0);
 508
 509         return lrn;
 510 }
 511
 512 static void lfsck_rbtree_free(struct lfsck_rbtree_node *lrn)
 513 {
 514         OBD_FREE(lrn->lrn_accessed_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 515         OBD_FREE(lrn->lrn_known_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 516         OBD_FREE_PTR(lrn);
 517 }
 518
 519 /* The caller should hold lock. */
 520 static struct lfsck_rbtree_node *
 521 lfsck_rbtree_insert(struct lfsck_layout_slave_data *llsd,
 522                     struct lfsck_rbtree_node *lrn)
 523 {
 524         struct rb_node           **pos    = &llsd->llsd_rb_root.rb_node;
 525         struct rb_node            *parent = NULL;
 526         struct lfsck_rbtree_node  *tmp;
 527         int                        rc;
 528
 529         while (*pos != NULL) {
 530                 parent = *pos;
 531                 tmp = rb_entry(parent, struct lfsck_rbtree_node, lrn_node);
 532                 rc = lfsck_rbtree_cmp(tmp, lrn->lrn_seq, lrn->lrn_first_oid);
 533                 if (rc < 0)
 534                         pos = &(*pos)->rb_left;
 535                 else if (rc > 0)
 536                         pos = &(*pos)->rb_right;
 537                 else
 538                         return tmp;
 539         }
 540
 541         rb_link_node(&lrn->lrn_node, parent, pos);
 542         rb_insert_color(&lrn->lrn_node, &llsd->llsd_rb_root);
 543
 544         return lrn;
 545 }
 546
 547 extern const struct dt_index_operations lfsck_orphan_index_ops;
 548
 549 static int lfsck_rbtree_setup(const struct lu_env *env,
 550                               struct lfsck_component *com)
 551 {
 552         struct lu_fid                   *fid    = &lfsck_env_info(env)->lti_fid;
 553         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 554         struct dt_device                *dev    = lfsck->li_bottom;
 555         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
 556         struct dt_object                *obj;
 557
 558         fid->f_seq = FID_SEQ_LAYOUT_RBTREE;
 559         fid->f_oid = lfsck_dev_idx(lfsck);
 560         fid->f_ver = 0;
 561         obj = dt_locate(env, dev, fid);
 562         if (IS_ERR(obj))
 563                 RETURN(PTR_ERR(obj));
 564
 565         /* Generate an in-RAM object to stand for the layout rbtree.
 566          * Scanning the layout rbtree will be via the iteration over
 567          * the object. In the future, the rbtree may be written onto
 568          * disk with the object.
 569          *
 570          * Mark the object to be as exist. */
 571         obj->do_lu.lo_header->loh_attr |= LOHA_EXISTS;
 572         obj->do_index_ops = &lfsck_orphan_index_ops;
 573         llsd->llsd_rb_obj = obj;
 574         llsd->llsd_rbtree_valid = 1;
 575         dev->dd_record_fid_accessed = 1;
 576
 577         CDEBUG(D_LFSCK, "%s: layout LFSCK init OST-objects accessing bitmap\n",
 578                lfsck_lfsck2name(lfsck));
 579
 580         return 0;
 581 }
 582
 583 static void lfsck_rbtree_cleanup(const struct lu_env *env,
 584                                  struct lfsck_component *com)
 585 {
 586         struct lfsck_instance           *lfsck = com->lc_lfsck;
 587         struct lfsck_layout_slave_data  *llsd  = com->lc_data;
 588         struct rb_node                  *node  = rb_first(&llsd->llsd_rb_root);
 589         struct rb_node                  *next;
 590         struct lfsck_rbtree_node        *lrn;
 591
 592         lfsck->li_bottom->dd_record_fid_accessed = 0;
 593         /* Invalid the rbtree, then no others will use it. */
 594         write_lock(&llsd->llsd_rb_lock);
 595         llsd->llsd_rbtree_valid = 0;
 596         write_unlock(&llsd->llsd_rb_lock);
 597
 598         while (node != NULL) {
 599                 next = rb_next(node);
 600                 lrn = rb_entry(node, struct lfsck_rbtree_node, lrn_node);
 601                 rb_erase(node, &llsd->llsd_rb_root);
 602                 lfsck_rbtree_free(lrn);
 603                 node = next;
 604         }
 605
 606         if (llsd->llsd_rb_obj != NULL) {
 607                 lfsck_object_put(env, llsd->llsd_rb_obj);
 608                 llsd->llsd_rb_obj = NULL;
 609         }
 610
 611         CDEBUG(D_LFSCK, "%s: layout LFSCK fini OST-objects accessing bitmap\n",
 612                lfsck_lfsck2name(lfsck));
 613 }
 614
 615 static void lfsck_rbtree_update_bitmap(const struct lu_env *env,
 616                                        struct lfsck_component *com,
 617                                        const struct lu_fid *fid,
 618                                        bool accessed)
 619 {
 620         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
 621         struct lfsck_rbtree_node        *lrn;
 622         bool                             insert = false;
 623         int                              idx;
 624         int                              rc     = 0;
 625         ENTRY;
 626
 627         if (unlikely(!fid_is_sane(fid) || fid_is_last_id(fid)))
 628                 RETURN_EXIT;
 629
 630         if (!fid_is_idif(fid) && !fid_is_norm(fid))
 631                 RETURN_EXIT;
 632
 633         read_lock(&llsd->llsd_rb_lock);
 634         if (!llsd->llsd_rbtree_valid)
 635                 GOTO(unlock, rc = 0);
 636
 637         lrn = lfsck_rbtree_search(llsd, fid, NULL);
 638         if (lrn == NULL) {
 639                 struct lfsck_rbtree_node *tmp;
 640
 641                 LASSERT(!insert);
 642
 643                 read_unlock(&llsd->llsd_rb_lock);
 644                 tmp = lfsck_rbtree_new(env, fid);
 645                 if (IS_ERR(tmp))
 646                         GOTO(out, rc = PTR_ERR(tmp));
 647
 648                 insert = true;
 649                 write_lock(&llsd->llsd_rb_lock);
 650                 if (!llsd->llsd_rbtree_valid) {
 651                         lfsck_rbtree_free(tmp);
 652                         GOTO(unlock, rc = 0);
 653                 }
 654
 655                 lrn = lfsck_rbtree_insert(llsd, tmp);
 656                 if (lrn != tmp)
 657                         lfsck_rbtree_free(tmp);
 658         }
 659
 660         idx = fid_oid(fid) & LFSCK_RBTREE_BITMAP_MASK;
 661         /* Any accessed object must be a known object. */
 662         if (!test_and_set_bit(idx, lrn->lrn_known_bitmap))
 663                 atomic_inc(&lrn->lrn_known_count);
 664         if (accessed && !test_and_set_bit(idx, lrn->lrn_accessed_bitmap))
 665                 atomic_inc(&lrn->lrn_accessed_count);
 666
 667         GOTO(unlock, rc = 0);
 668
 669 unlock:
 670         if (insert)
 671                 write_unlock(&llsd->llsd_rb_lock);
 672         else
 673                 read_unlock(&llsd->llsd_rb_lock);
 674 out:
 675         if (rc != 0 && accessed) {
 676                 struct lfsck_layout *lo = com->lc_file_ram;
 677
 678                 CDEBUG(D_LFSCK, "%s: fail to update OST-objects accessing "
 679                        "bitmap, and will cause incorrect LFSCK OST-object "
 680                        "handling, so disable it to cancel orphan handling "
 681                        "for related device. rc = %d\n",
 682                        lfsck_lfsck2name(com->lc_lfsck), rc);
 683
 684                 lo->ll_flags |= LF_INCOMPLETE;
 685                 lfsck_rbtree_cleanup(env, com);
 686         }
 687 }
 688
 689 static void lfsck_layout_le_to_cpu(struct lfsck_layout *des,
 690                                    const struct lfsck_layout *src)
 691 {
 692         int i;
 693
 694         des->ll_magic = le32_to_cpu(src->ll_magic);
 695         des->ll_status = le32_to_cpu(src->ll_status);
 696         des->ll_flags = le32_to_cpu(src->ll_flags);
 697         des->ll_success_count = le32_to_cpu(src->ll_success_count);
 698         des->ll_run_time_phase1 = le32_to_cpu(src->ll_run_time_phase1);
 699         des->ll_run_time_phase2 = le32_to_cpu(src->ll_run_time_phase2);
 700         des->ll_time_last_complete = le64_to_cpu(src->ll_time_last_complete);
 701         des->ll_time_latest_start = le64_to_cpu(src->ll_time_latest_start);
 702         des->ll_time_last_checkpoint =
 703                                 le64_to_cpu(src->ll_time_last_checkpoint);
 704         des->ll_pos_latest_start = le64_to_cpu(src->ll_pos_latest_start);
 705         des->ll_pos_last_checkpoint = le64_to_cpu(src->ll_pos_last_checkpoint);
 706         des->ll_pos_first_inconsistent =
 707                         le64_to_cpu(src->ll_pos_first_inconsistent);
 708         des->ll_objs_checked_phase1 = le64_to_cpu(src->ll_objs_checked_phase1);
 709         des->ll_objs_failed_phase1 = le64_to_cpu(src->ll_objs_failed_phase1);
 710         des->ll_objs_checked_phase2 = le64_to_cpu(src->ll_objs_checked_phase2);
 711         des->ll_objs_failed_phase2 = le64_to_cpu(src->ll_objs_failed_phase2);
 712         for (i = 0; i < LLIT_MAX; i++)
 713                 des->ll_objs_repaired[i] =
 714                                 le64_to_cpu(src->ll_objs_repaired[i]);
 715         des->ll_objs_skipped = le64_to_cpu(src->ll_objs_skipped);
 716         des->ll_bitmap_size = le32_to_cpu(src->ll_bitmap_size);
 717 }
 718
 719 static void lfsck_layout_cpu_to_le(struct lfsck_layout *des,
 720                                    const struct lfsck_layout *src)
 721 {
 722         int i;
 723
 724         des->ll_magic = cpu_to_le32(src->ll_magic);
 725         des->ll_status = cpu_to_le32(src->ll_status);
 726         des->ll_flags = cpu_to_le32(src->ll_flags);
 727         des->ll_success_count = cpu_to_le32(src->ll_success_count);
 728         des->ll_run_time_phase1 = cpu_to_le32(src->ll_run_time_phase1);
 729         des->ll_run_time_phase2 = cpu_to_le32(src->ll_run_time_phase2);
 730         des->ll_time_last_complete = cpu_to_le64(src->ll_time_last_complete);
 731         des->ll_time_latest_start = cpu_to_le64(src->ll_time_latest_start);
 732         des->ll_time_last_checkpoint =
 733                                 cpu_to_le64(src->ll_time_last_checkpoint);
 734         des->ll_pos_latest_start = cpu_to_le64(src->ll_pos_latest_start);
 735         des->ll_pos_last_checkpoint = cpu_to_le64(src->ll_pos_last_checkpoint);
 736         des->ll_pos_first_inconsistent =
 737                         cpu_to_le64(src->ll_pos_first_inconsistent);
 738         des->ll_objs_checked_phase1 = cpu_to_le64(src->ll_objs_checked_phase1);
 739         des->ll_objs_failed_phase1 = cpu_to_le64(src->ll_objs_failed_phase1);
 740         des->ll_objs_checked_phase2 = cpu_to_le64(src->ll_objs_checked_phase2);
 741         des->ll_objs_failed_phase2 = cpu_to_le64(src->ll_objs_failed_phase2);
 742         for (i = 0; i < LLIT_MAX; i++)
 743                 des->ll_objs_repaired[i] =
 744                                 cpu_to_le64(src->ll_objs_repaired[i]);
 745         des->ll_objs_skipped = cpu_to_le64(src->ll_objs_skipped);
 746         des->ll_bitmap_size = cpu_to_le32(src->ll_bitmap_size);
 747 }
 748
 749 /**
 750  * Load the OST bitmap from the lfsck_layout trace file.
 751  *
 752  * \param[in] env       pointer to the thread context
 753  * \param[in] com       pointer to the lfsck component
 754  *
 755  * \retval              0 for success
 756  * \retval              negative error number on failure or data corruption
 757  */
 758 static int lfsck_layout_load_bitmap(const struct lu_env *env,
 759                                     struct lfsck_component *com)
 760 {
 761         struct dt_object                *obj    = com->lc_obj;
 762         struct lfsck_assistant_data     *lad    = com->lc_data;
 763         struct lfsck_layout             *lo     = com->lc_file_ram;
 764         cfs_bitmap_t                    *bitmap = lad->lad_bitmap;
 765         loff_t                           pos    = com->lc_file_size;
 766         ssize_t                          size;
 767         __u32                            nbits;
 768         int                              rc;
 769         ENTRY;
 770
 771         if (com->lc_lfsck->li_ost_descs.ltd_tgts_bitmap->size >
 772             lo->ll_bitmap_size)
 773                 nbits = com->lc_lfsck->li_ost_descs.ltd_tgts_bitmap->size;
 774         else
 775                 nbits = lo->ll_bitmap_size;
 776
 777         if (unlikely(nbits < BITS_PER_LONG))
 778                 nbits = BITS_PER_LONG;
 779
 780         if (nbits > bitmap->size) {
 781                 __u32 new_bits = bitmap->size;
 782                 cfs_bitmap_t *new_bitmap;
 783
 784                 while (new_bits < nbits)
 785                         new_bits <<= 1;
 786
 787                 new_bitmap = CFS_ALLOCATE_BITMAP(new_bits);
 788                 if (new_bitmap == NULL)
 789                         RETURN(-ENOMEM);
 790
 791                 lad->lad_bitmap = new_bitmap;
 792                 CFS_FREE_BITMAP(bitmap);
 793                 bitmap = new_bitmap;
 794         }
 795
 796         if (lo->ll_bitmap_size == 0) {
 797                 lad->lad_incomplete = 0;
 798                 CFS_RESET_BITMAP(bitmap);
 799
 800                 RETURN(0);
 801         }
 802
 803         size = (lo->ll_bitmap_size + 7) >> 3;
 804         rc = dt_read(env, obj, lfsck_buf_get(env, bitmap->data, size), &pos);
 805         if (rc != size)
 806                 RETURN(rc >= 0 ? -EINVAL : rc);
 807
 808         if (cfs_bitmap_check_empty(bitmap))
 809                 lad->lad_incomplete = 0;
 810         else
 811                 lad->lad_incomplete = 1;
 812
 813         RETURN(0);
 814 }
 815
 816 /**
 817  * Load the layout LFSCK trace file from disk.
 818  *
 819  * The layout LFSCK trace file records the layout LFSCK status information
 820  * and other statistics, such as how many objects have been scanned, and how
 821  * many objects have been repaired, and etc. It also contains the bitmap for
 822  * failed OSTs during the layout LFSCK. All these information will be loaded
 823  * from disk to RAM when the layout LFSCK component setup.
 824  *
 825  * \param[in] env       pointer to the thread context
 826  * \param[in] com       pointer to the lfsck component
 827  *
 828  * \retval              positive number for file data corruption, the caller
 829  *                      should reset the layout LFSCK trace file
 830  * \retval              0 for success
 831  * \retval              negative error number on failure
 832  */
 833 static int lfsck_layout_load(const struct lu_env *env,
 834                              struct lfsck_component *com)
 835 {
 836         struct lfsck_layout             *lo     = com->lc_file_ram;
 837         ssize_t                          size   = com->lc_file_size;
 838         loff_t                           pos    = 0;
 839         int                              rc;
 840
 841         rc = dt_read(env, com->lc_obj,
 842                      lfsck_buf_get(env, com->lc_file_disk, size), &pos);
 843         if (rc == 0) {
 844                 return -ENOENT;
 845         } else if (rc < 0) {
 846                 CDEBUG(D_LFSCK, "%s: failed to load lfsck_layout: rc = %d\n",
 847                        lfsck_lfsck2name(com->lc_lfsck), rc);
 848                 return rc;
 849         } else if (rc != size) {
 850                 CDEBUG(D_LFSCK, "%s: lfsck_layout size %u != %u; reset it\n",
 851                        lfsck_lfsck2name(com->lc_lfsck), rc, (unsigned int)size);
 852                 return 1;
 853         }
 854
 855         lfsck_layout_le_to_cpu(lo, com->lc_file_disk);
 856         if (lo->ll_magic != LFSCK_LAYOUT_MAGIC) {
 857                 CDEBUG(D_LFSCK, "%s: invalid lfsck_layout magic %#x != %#x, "
 858                        "to be reset\n", lfsck_lfsck2name(com->lc_lfsck),
 859                        lo->ll_magic, LFSCK_LAYOUT_MAGIC);
 860                 return 1;
 861         }
 862
 863         return 0;
 864 }
 865
 866 /**
 867  * Store the layout LFSCK trace file on disk.
 868  *
 869  * The layout LFSCK trace file records the layout LFSCK status information
 870  * and other statistics, such as how many objects have been scanned, and how
 871  * many objects have been repaired, and etc. It also contains the bitmap for
 872  * failed OSTs during the layout LFSCK. All these information will be synced
 873  * from RAM to disk periodically.
 874  *
 875  * \param[in] env       pointer to the thread context
 876  * \param[in] com       pointer to the lfsck component
 877  *
 878  * \retval              0 for success
 879  * \retval              negative error number on failure
 880  */
 881 static int lfsck_layout_store(const struct lu_env *env,
 882                               struct lfsck_component *com)
 883 {
 884         struct dt_object        *obj    = com->lc_obj;
 885         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 886         struct lfsck_layout     *lo_ram = com->lc_file_ram;
 887         struct lfsck_layout     *lo     = com->lc_file_disk;
 888         struct thandle          *th;
 889         struct dt_device        *dev    = lfsck_obj2dev(obj);
 890         cfs_bitmap_t            *bitmap = NULL;
 891         loff_t                   pos;
 892         ssize_t                  size   = com->lc_file_size;
 893         __u32                    nbits  = 0;
 894         int                      rc;
 895         ENTRY;
 896
 897         if (lfsck->li_master) {
 898                 struct lfsck_assistant_data *lad = com->lc_data;
 899
 900                 bitmap = lad->lad_bitmap;
 901                 nbits = bitmap->size;
 902
 903                 LASSERT(nbits > 0);
 904                 LASSERTF((nbits & 7) == 0, "Invalid nbits %u\n", nbits);
 905         }
 906
 907         lo_ram->ll_bitmap_size = nbits;
 908         lfsck_layout_cpu_to_le(lo, lo_ram);
 909         th = dt_trans_create(env, dev);
 910         if (IS_ERR(th))
 911                 GOTO(log, rc = PTR_ERR(th));
 912
 913         rc = dt_declare_record_write(env, obj, lfsck_buf_get(env, lo, size),
 914                                      (loff_t)0, th);
 915         if (rc != 0)
 916                 GOTO(out, rc);
 917
 918         if (bitmap != NULL) {
 919                 rc = dt_declare_record_write(env, obj,
 920                                 lfsck_buf_get(env, bitmap->data, nbits >> 3),
 921                                 (loff_t)size, th);
 922                 if (rc != 0)
 923                         GOTO(out, rc);
 924         }
 925
 926         rc = dt_trans_start_local(env, dev, th);
 927         if (rc != 0)
 928                 GOTO(out, rc);
 929
 930         pos = 0;
 931         rc = dt_record_write(env, obj, lfsck_buf_get(env, lo, size), &pos, th);
 932         if (rc != 0)
 933                 GOTO(out, rc);
 934
 935         if (bitmap != NULL) {
 936                 pos = size;
 937                 rc = dt_record_write(env, obj,
 938                                 lfsck_buf_get(env, bitmap->data, nbits >> 3),
 939                                 &pos, th);
 940         }
 941
 942         GOTO(out, rc);
 943
 944 out:
 945         dt_trans_stop(env, dev, th);
 946
 947 log:
 948         if (rc != 0)
 949                 CDEBUG(D_LFSCK, "%s: fail to store lfsck_layout: rc = %d\n",
 950                        lfsck_lfsck2name(lfsck), rc);
 951
 952         return rc;
 953 }
 954
 955 static int lfsck_layout_init(const struct lu_env *env,
 956                              struct lfsck_component *com)
 957 {
 958         struct lfsck_layout *lo = com->lc_file_ram;
 959         int rc;
 960
 961         memset(lo, 0, com->lc_file_size);
 962         lo->ll_magic = LFSCK_LAYOUT_MAGIC;
 963         lo->ll_status = LS_INIT;
 964         down_write(&com->lc_sem);
 965         rc = lfsck_layout_store(env, com);
 966         up_write(&com->lc_sem);
 967
 968         return rc;
 969 }
 970
 971 static int fid_is_for_ostobj(const struct lu_env *env,
 972                              struct lfsck_instance *lfsck,
 973                              struct dt_object *obj, const struct lu_fid *fid)
 974 {
 975         struct seq_server_site  *ss     = lfsck_dev_site(lfsck);
 976         struct lu_seq_range     *range  = &lfsck_env_info(env)->lti_range;
 977         struct lustre_mdt_attrs *lma;
 978         int                      rc;
 979
 980         fld_range_set_any(range);
 981         rc = fld_server_lookup(env, ss->ss_server_fld, fid_seq(fid), range);
 982         if (rc == 0) {
 983                 if (fld_range_is_ost(range))
 984                         return 1;
 985
 986                 return 0;
 987         }
 988
 989         lma = &lfsck_env_info(env)->lti_lma;
 990         rc = dt_xattr_get(env, obj, lfsck_buf_get(env, lma, sizeof(*lma)),
 991                           XATTR_NAME_LMA);
 992         if (rc == sizeof(*lma)) {
 993                 lustre_lma_swab(lma);
 994
 995                 return lma->lma_compat & LMAC_FID_ON_OST ? 1 : 0;
 996         }
 997
 998         rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_FID);
 999
1000         return rc > 0;
1001 }
1002
1003 static struct lfsck_layout_seq *
1004 lfsck_layout_seq_lookup(struct lfsck_layout_slave_data *llsd, __u64 seq)
1005 {
1006         struct lfsck_layout_seq *lls;
1007
1008         list_for_each_entry(lls, &llsd->llsd_seq_list, lls_list) {
1009                 if (lls->lls_seq == seq)
1010                         return lls;
1011
1012                 if (lls->lls_seq > seq)
1013                         return NULL;
1014         }
1015
1016         return NULL;
1017 }
1018
1019 static void
1020 lfsck_layout_seq_insert(struct lfsck_layout_slave_data *llsd,
1021                         struct lfsck_layout_seq *lls)
1022 {
1023         struct lfsck_layout_seq *tmp;
1024         struct list_head        *pos = &llsd->llsd_seq_list;
1025
1026         list_for_each_entry(tmp, &llsd->llsd_seq_list, lls_list) {
1027                 if (lls->lls_seq < tmp->lls_seq) {
1028                         pos = &tmp->lls_list;
1029                         break;
1030                 }
1031         }
1032         list_add_tail(&lls->lls_list, pos);
1033 }
1034
1035 static int
1036 lfsck_layout_lastid_create(const struct lu_env *env,
1037                            struct lfsck_instance *lfsck,
1038                            struct dt_object *obj)
1039 {
1040         struct lfsck_thread_info *info   = lfsck_env_info(env);
1041         struct lu_attr           *la     = &info->lti_la;
1042         struct dt_object_format  *dof    = &info->lti_dof;
1043         struct lfsck_bookmark    *bk     = &lfsck->li_bookmark_ram;
1044         struct dt_device         *dt     = lfsck_obj2dev(obj);
1045         struct thandle           *th;
1046         __u64                     lastid = 0;
1047         loff_t                    pos    = 0;
1048         int                       rc;
1049         ENTRY;
1050
1051         if (bk->lb_param & LPF_DRYRUN)
1052                 return 0;
1053
1054         memset(la, 0, sizeof(*la));
1055         la->la_mode = S_IFREG |  S_IRUGO | S_IWUSR;
1056         la->la_valid = LA_MODE | LA_UID | LA_GID;
1057         memset(dof, 0, sizeof(*dof));
1058         dof->dof_type = dt_mode_to_dft(S_IFREG);
1059
1060         th = dt_trans_create(env, dt);
1061         if (IS_ERR(th))
1062                 GOTO(log, rc = PTR_ERR(th));
1063
1064         rc = dt_declare_create(env, obj, la, NULL, dof, th);
1065         if (rc != 0)
1066                 GOTO(stop, rc);
1067
1068         rc = dt_declare_record_write(env, obj,
1069                                      lfsck_buf_get(env, &lastid,
1070                                                    sizeof(lastid)),
1071                                      pos, th);
1072         if (rc != 0)
1073                 GOTO(stop, rc);
1074
1075         rc = dt_trans_start_local(env, dt, th);
1076         if (rc != 0)
1077                 GOTO(stop, rc);
1078
1079         dt_write_lock(env, obj, 0);
1080         if (likely(dt_object_exists(obj) == 0)) {
1081                 rc = dt_create(env, obj, la, NULL, dof, th);
1082                 if (rc == 0)
1083                         rc = dt_record_write(env, obj,
1084                                 lfsck_buf_get(env, &lastid, sizeof(lastid)),
1085                                 &pos, th);
1086         }
1087         dt_write_unlock(env, obj);
1088
1089         GOTO(stop, rc);
1090
1091 stop:
1092         dt_trans_stop(env, dt, th);
1093
1094 log:
1095         CDEBUG(D_LFSCK, "%s: layout LFSCK will create LAST_ID for <seq> "
1096                LPX64": rc = %d\n",
1097                lfsck_lfsck2name(lfsck), fid_seq(lfsck_dto2fid(obj)), rc);
1098
1099         return rc;
1100 }
1101
1102 static int
1103 lfsck_layout_lastid_reload(const struct lu_env *env,
1104                            struct lfsck_component *com,
1105                            struct lfsck_layout_seq *lls)
1106 {
1107         __u64   lastid;
1108         loff_t  pos     = 0;
1109         int     rc;
1110
1111         dt_read_lock(env, lls->lls_lastid_obj, 0);
1112         rc = dt_record_read(env, lls->lls_lastid_obj,
1113                             lfsck_buf_get(env, &lastid, sizeof(lastid)), &pos);
1114         dt_read_unlock(env, lls->lls_lastid_obj);
1115         if (unlikely(rc != 0))
1116                 return rc;
1117
1118         lastid = le64_to_cpu(lastid);
1119         if (lastid < lls->lls_lastid_known) {
1120                 struct lfsck_instance   *lfsck  = com->lc_lfsck;
1121                 struct lfsck_layout     *lo     = com->lc_file_ram;
1122
1123                 lls->lls_lastid = lls->lls_lastid_known;
1124                 lls->lls_dirty = 1;
1125                 if (!(lo->ll_flags & LF_CRASHED_LASTID)) {
1126                         LASSERT(lfsck->li_out_notify != NULL);
1127
1128                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
1129                                              LE_LASTID_REBUILDING);
1130                         lo->ll_flags |= LF_CRASHED_LASTID;
1131
1132                         CDEBUG(D_LFSCK, "%s: layout LFSCK finds crashed "
1133                                "LAST_ID file (1) for the sequence "LPX64
1134                                ", old value "LPU64", known value "LPU64"\n",
1135                                lfsck_lfsck2name(lfsck), lls->lls_seq,
1136                                lastid, lls->lls_lastid);
1137                 }
1138         } else if (lastid >= lls->lls_lastid) {
1139                 lls->lls_lastid = lastid;
1140                 lls->lls_dirty = 0;
1141         }
1142
1143         return 0;
1144 }
1145
1146 static int
1147 lfsck_layout_lastid_store(const struct lu_env *env,
1148                           struct lfsck_component *com)
1149 {
1150         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1151         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
1152         struct dt_device                *dt     = lfsck->li_bottom;
1153         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
1154         struct lfsck_layout_seq         *lls;
1155         struct thandle                  *th;
1156         __u64                            lastid;
1157         int                              rc     = 0;
1158         int                              rc1    = 0;
1159
1160         list_for_each_entry(lls, &llsd->llsd_seq_list, lls_list) {
1161                 loff_t pos = 0;
1162
1163                 if (!lls->lls_dirty)
1164                         continue;
1165
1166                 CDEBUG(D_LFSCK, "%s: layout LFSCK will sync the LAST_ID for "
1167                        "<seq> "LPX64" as <oid> "LPU64"\n",
1168                        lfsck_lfsck2name(lfsck), lls->lls_seq, lls->lls_lastid);
1169
1170                 if (bk->lb_param & LPF_DRYRUN) {
1171                         lls->lls_dirty = 0;
1172                         continue;
1173                 }
1174
1175                 th = dt_trans_create(env, dt);
1176                 if (IS_ERR(th)) {
1177                         rc1 = PTR_ERR(th);
1178                         CDEBUG(D_LFSCK, "%s: layout LFSCK failed to store "
1179                                "the LAST_ID for <seq> "LPX64"(1): rc = %d\n",
1180                                lfsck_lfsck2name(com->lc_lfsck),
1181                                lls->lls_seq, rc1);
1182                         continue;
1183                 }
1184
1185                 lastid = cpu_to_le64(lls->lls_lastid);
1186                 rc = dt_declare_record_write(env, lls->lls_lastid_obj,
1187                                              lfsck_buf_get(env, &lastid,
1188                                                            sizeof(lastid)),
1189                                              pos, th);
1190                 if (rc != 0)
1191                         goto stop;
1192
1193                 rc = dt_trans_start_local(env, dt, th);
1194                 if (rc != 0)
1195                         goto stop;
1196
1197                 dt_write_lock(env, lls->lls_lastid_obj, 0);
1198                 rc = dt_record_write(env, lls->lls_lastid_obj,
1199                                      lfsck_buf_get(env, &lastid,
1200                                      sizeof(lastid)), &pos, th);
1201                 dt_write_unlock(env, lls->lls_lastid_obj);
1202                 if (rc == 0)
1203                         lls->lls_dirty = 0;
1204
1205 stop:
1206                 dt_trans_stop(env, dt, th);
1207                 if (rc != 0) {
1208                         rc1 = rc;
1209                         CDEBUG(D_LFSCK, "%s: layout LFSCK failed to store "
1210                                "the LAST_ID for <seq> "LPX64"(2): rc = %d\n",
1211                                lfsck_lfsck2name(com->lc_lfsck),
1212                                lls->lls_seq, rc1);
1213                 }
1214         }
1215
1216         return rc1;
1217 }
1218
1219 static int
1220 lfsck_layout_lastid_load(const struct lu_env *env,
1221                          struct lfsck_component *com,
1222                          struct lfsck_layout_seq *lls)
1223 {
1224         struct lfsck_instance   *lfsck  = com->lc_lfsck;
1225         struct lfsck_layout     *lo     = com->lc_file_ram;
1226         struct lu_fid           *fid    = &lfsck_env_info(env)->lti_fid;
1227         struct dt_object        *obj;
1228         loff_t                   pos    = 0;
1229         int                      rc;
1230         ENTRY;
1231
1232         lu_last_id_fid(fid, lls->lls_seq, lfsck_dev_idx(lfsck));
1233         obj = dt_locate(env, lfsck->li_bottom, fid);
1234         if (IS_ERR(obj))
1235                 RETURN(PTR_ERR(obj));
1236
1237         /* LAST_ID crashed, to be rebuilt */
1238         if (dt_object_exists(obj) == 0) {
1239                 if (!(lo->ll_flags & LF_CRASHED_LASTID)) {
1240                         LASSERT(lfsck->li_out_notify != NULL);
1241
1242                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
1243                                              LE_LASTID_REBUILDING);
1244                         lo->ll_flags |= LF_CRASHED_LASTID;
1245
1246                         CDEBUG(D_LFSCK, "%s: layout LFSCK cannot find the "
1247                                "LAST_ID file for sequence "LPX64"\n",
1248                                lfsck_lfsck2name(lfsck), lls->lls_seq);
1249
1250                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_DELAY4) &&
1251                             cfs_fail_val > 0) {
1252                                 struct l_wait_info lwi = LWI_TIMEOUT(
1253                                                 cfs_time_seconds(cfs_fail_val),
1254                                                 NULL, NULL);
1255
1256                                 /* Some others may changed the cfs_fail_val
1257                                  * as zero after above check, re-check it for
1258                                  * sure to avoid falling into wait for ever. */
1259                                 if (likely(lwi.lwi_timeout > 0)) {
1260                                         struct ptlrpc_thread *thread =
1261                                                 &lfsck->li_thread;
1262
1263                                         up_write(&com->lc_sem);
1264                                         l_wait_event(thread->t_ctl_waitq,
1265                                                      !thread_is_running(thread),
1266                                                      &lwi);
1267                                         down_write(&com->lc_sem);
1268                                 }
1269                         }
1270                 }
1271
1272                 rc = lfsck_layout_lastid_create(env, lfsck, obj);
1273         } else {
1274                 dt_read_lock(env, obj, 0);
1275                 rc = dt_read(env, obj,
1276                         lfsck_buf_get(env, &lls->lls_lastid, sizeof(__u64)),
1277                         &pos);
1278                 dt_read_unlock(env, obj);
1279                 if (rc != 0 && rc != sizeof(__u64))
1280                         GOTO(out, rc = (rc > 0 ? -EFAULT : rc));
1281
1282                 if (rc == 0 && !(lo->ll_flags & LF_CRASHED_LASTID)) {
1283                         LASSERT(lfsck->li_out_notify != NULL);
1284
1285                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
1286                                              LE_LASTID_REBUILDING);
1287                         lo->ll_flags |= LF_CRASHED_LASTID;
1288
1289                         CDEBUG(D_LFSCK, "%s: layout LFSCK finds invalid "
1290                                "LAST_ID file for the sequence "LPX64
1291                                ": rc = %d\n",
1292                                lfsck_lfsck2name(lfsck), lls->lls_seq, rc);
1293                 }
1294
1295                 lls->lls_lastid = le64_to_cpu(lls->lls_lastid);
1296                 rc = 0;
1297         }
1298
1299         GOTO(out, rc);
1300
1301 out:
1302         if (rc != 0)
1303                 lfsck_object_put(env, obj);
1304         else
1305                 lls->lls_lastid_obj = obj;
1306
1307         return rc;
1308 }
1309
1310 static void lfsck_layout_record_failure(const struct lu_env *env,
1311                                         struct lfsck_instance *lfsck,
1312                                         struct lfsck_layout *lo)
1313 {
1314         __u64 cookie;
1315
1316         lo->ll_objs_failed_phase1++;
1317         cookie = lfsck->li_obj_oit->do_index_ops->dio_it.store(env,
1318                                                         lfsck->li_di_oit);
1319         if (lo->ll_pos_first_inconsistent == 0 ||
1320             lo->ll_pos_first_inconsistent < cookie) {
1321                 lo->ll_pos_first_inconsistent = cookie;
1322
1323                 CDEBUG(D_LFSCK, "%s: layout LFSCK hit first non-repaired "
1324                        "inconsistency at the pos ["LPU64"]\n",
1325                        lfsck_lfsck2name(lfsck),
1326                        lo->ll_pos_first_inconsistent);
1327         }
1328 }
1329
1330 static int lfsck_layout_double_scan_result(const struct lu_env *env,
1331                                            struct lfsck_component *com,
1332                                            int rc)
1333 {
1334         struct lfsck_instance   *lfsck = com->lc_lfsck;
1335         struct lfsck_layout     *lo    = com->lc_file_ram;
1336
1337         down_write(&com->lc_sem);
1338         lo->ll_run_time_phase2 += cfs_duration_sec(cfs_time_current() +
1339                                   HALF_SEC - com->lc_time_last_checkpoint);
1340         lo->ll_time_last_checkpoint = cfs_time_current_sec();
1341         lo->ll_objs_checked_phase2 += com->lc_new_checked;
1342
1343         if (rc > 0) {
1344                 if (lo->ll_flags & LF_INCOMPLETE) {
1345                         lo->ll_status = LS_PARTIAL;
1346                 } else {
1347                         if (lfsck->li_master) {
1348                                 struct lfsck_assistant_data *lad = com->lc_data;
1349
1350                                 if (lad->lad_incomplete)
1351                                         lo->ll_status = LS_PARTIAL;
1352                                 else
1353                                         lo->ll_status = LS_COMPLETED;
1354                         } else {
1355                                 lo->ll_status = LS_COMPLETED;
1356                         }
1357                 }
1358                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN))
1359                         lo->ll_flags &= ~(LF_SCANNED_ONCE | LF_INCONSISTENT);
1360                 lo->ll_time_last_complete = lo->ll_time_last_checkpoint;
1361                 lo->ll_success_count++;
1362         } else if (rc == 0) {
1363                 if (lfsck->li_status != 0)
1364                         lo->ll_status = lfsck->li_status;
1365                 else
1366                         lo->ll_status = LS_STOPPED;
1367         } else {
1368                 lo->ll_status = LS_FAILED;
1369         }
1370
1371         rc = lfsck_layout_store(env, com);
1372         up_write(&com->lc_sem);
1373
1374         return rc;
1375 }
1376
1377 static int lfsck_layout_trans_stop(const struct lu_env *env,
1378                                    struct dt_device *dev,
1379                                    struct thandle *handle, int result)
1380 {
1381         int rc;
1382
1383         /* XXX: If there is something worng or it needs to repair nothing,
1384          *      then notify the lower to stop the modification. Currently,
1385          *      we use th_result for such purpose, that may be replaced by
1386          *      some rollback mechanism in the future. */
1387         handle->th_result = result;
1388         rc = dt_trans_stop(env, dev, handle);
1389         if (result != 0)
1390                 return result > 0 ? 0 : result;
1391
1392         return rc == 0 ? 1 : rc;
1393 }
1394
1395 /**
1396  * Get the system default stripe size.
1397  *
1398  * \param[in] env       pointer to the thread context
1399  * \param[in] lfsck     pointer to the lfsck instance
1400  * \param[out] size     pointer to the default stripe size
1401  *
1402  * \retval              0 for success
1403  * \retval              negative error number on failure
1404  */
1405 static int lfsck_layout_get_def_stripesize(const struct lu_env *env,
1406                                            struct lfsck_instance *lfsck,
1407                                            __u32 *size)
1408 {
1409         struct lov_user_md      *lum = &lfsck_env_info(env)->lti_lum;
1410         struct dt_object        *root;
1411         int                      rc;
1412
1413         root = dt_locate(env, lfsck->li_next, &lfsck->li_local_root_fid);
1414         if (IS_ERR(root))
1415                 return PTR_ERR(root);
1416
1417         /* Get the default stripe size via xattr_get on the backend root. */
1418         rc = dt_xattr_get(env, root, lfsck_buf_get(env, lum, sizeof(*lum)),
1419                           XATTR_NAME_LOV);
1420         if (rc > 0) {
1421                 /* The lum->lmm_stripe_size is LE mode. The *size also
1422                  * should be LE mode. So it is unnecessary to convert. */
1423                 *size = lum->lmm_stripe_size;
1424                 rc = 0;
1425         } else if (unlikely(rc == 0)) {
1426                 rc = -EINVAL;
1427         }
1428
1429         lfsck_object_put(env, root);
1430
1431         return rc;
1432 }
1433
1434 /**
1435  * \retval       +1: repaired
1436  * \retval        0: did nothing
1437  * \retval      -ve: on error
1438  */
1439 static int lfsck_layout_refill_lovea(const struct lu_env *env,
1440                                      struct thandle *handle,
1441                                      struct dt_object *parent,
1442                                      struct lu_fid *cfid,
1443                                      struct lu_buf *buf,
1444                                      struct lov_ost_data_v1 *slot,
1445                                      int fl, __u32 ost_idx)
1446 {
1447         struct ost_id           *oi     = &lfsck_env_info(env)->lti_oi;
1448         struct lov_mds_md_v1    *lmm    = buf->lb_buf;
1449         struct lu_buf            ea_buf;
1450         int                      rc;
1451         __u32                    magic;
1452         __u16                    count;
1453         ENTRY;
1454
1455         magic = le32_to_cpu(lmm->lmm_magic);
1456         count = le16_to_cpu(lmm->lmm_stripe_count);
1457
1458         fid_to_ostid(cfid, oi);
1459         ostid_cpu_to_le(oi, &slot->l_ost_oi);
1460         slot->l_ost_gen = cpu_to_le32(0);
1461         slot->l_ost_idx = cpu_to_le32(ost_idx);
1462
1463         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_HOLE) {
1464                 struct lov_ost_data_v1 *objs;
1465                 int                     i;
1466
1467                 if (magic == LOV_MAGIC_V1)
1468                         objs = &lmm->lmm_objects[0];
1469                 else
1470                         objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
1471                 for (i = 0; i < count; i++, objs++) {
1472                         if (objs != slot && lovea_slot_is_dummy(objs))
1473                                 break;
1474                 }
1475
1476                 /* If the @slot is the last dummy slot to be refilled,
1477                  * then drop LOV_PATTERN_F_HOLE from lmm::lmm_pattern. */
1478                 if (i == count)
1479                         lmm->lmm_pattern &= ~cpu_to_le32(LOV_PATTERN_F_HOLE);
1480         }
1481
1482         lfsck_buf_init(&ea_buf, lmm, lov_mds_md_size(count, magic));
1483         rc = dt_xattr_set(env, parent, &ea_buf, XATTR_NAME_LOV, fl, handle);
1484         if (rc == 0)
1485                 rc = 1;
1486
1487         RETURN(rc);
1488 }
1489
1490 /**
1491  * \retval       +1: repaired
1492  * \retval        0: did nothing
1493  * \retval      -ve: on error
1494  */
1495 static int lfsck_layout_extend_lovea(const struct lu_env *env,
1496                                      struct lfsck_instance *lfsck,
1497                                      struct thandle *handle,
1498                                      struct dt_object *parent,
1499                                      struct lu_fid *cfid,
1500                                      struct lu_buf *buf, int fl,
1501                                      __u32 ost_idx, __u32 ea_off, bool reset)
1502 {
1503         struct lov_mds_md_v1    *lmm    = buf->lb_buf;
1504         struct lov_ost_data_v1  *objs;
1505         int                      rc;
1506         __u16                    count;
1507         bool                     hole   = false;
1508         ENTRY;
1509
1510         if (fl == LU_XATTR_CREATE || reset) {
1511                 __u32 pattern = LOV_PATTERN_RAID0;
1512
1513                 count = ea_off + 1;
1514                 LASSERT(buf->lb_len >= lov_mds_md_size(count, LOV_MAGIC_V1));
1515
1516                 if (ea_off != 0 || reset) {
1517                         pattern |= LOV_PATTERN_F_HOLE;
1518                         hole = true;
1519                 }
1520
1521                 memset(lmm, 0, buf->lb_len);
1522                 lmm->lmm_magic = cpu_to_le32(LOV_MAGIC_V1);
1523                 lmm->lmm_pattern = cpu_to_le32(pattern);
1524                 fid_to_lmm_oi(lfsck_dto2fid(parent), &lmm->lmm_oi);
1525                 lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
1526
1527                 rc = lfsck_layout_get_def_stripesize(env, lfsck,
1528                                                      &lmm->lmm_stripe_size);
1529                 if (rc != 0)
1530                         RETURN(rc);
1531
1532                 objs = &lmm->lmm_objects[ea_off];
1533         } else {
1534                 __u32   magic = le32_to_cpu(lmm->lmm_magic);
1535                 int     gap;
1536
1537                 count = le16_to_cpu(lmm->lmm_stripe_count);
1538                 if (magic == LOV_MAGIC_V1)
1539                         objs = &lmm->lmm_objects[count];
1540                 else
1541                         objs = &((struct lov_mds_md_v3 *)lmm)->
1542                                                         lmm_objects[count];
1543
1544                 gap = ea_off - count;
1545                 if (gap >= 0)
1546                         count = ea_off + 1;
1547                 LASSERT(buf->lb_len >= lov_mds_md_size(count, magic));
1548
1549                 if (gap > 0) {
1550                         memset(objs, 0, gap * sizeof(*objs));
1551                         lmm->lmm_pattern |= cpu_to_le32(LOV_PATTERN_F_HOLE);
1552                         hole = true;
1553                 }
1554
1555                 lmm->lmm_layout_gen =
1556                             cpu_to_le16(le16_to_cpu(lmm->lmm_layout_gen) + 1);
1557                 objs += gap;
1558         }
1559
1560         lmm->lmm_stripe_count = cpu_to_le16(count);
1561         rc = lfsck_layout_refill_lovea(env, handle, parent, cfid, buf, objs,
1562                                        fl, ost_idx);
1563
1564         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant extend layout EA for "
1565                DFID": parent "DFID", OST-index %u, stripe-index %u, fl %d, "
1566                "reset %s, %s LOV EA hole: rc = %d\n",
1567                lfsck_lfsck2name(lfsck), PFID(cfid), PFID(lfsck_dto2fid(parent)),
1568                ost_idx, ea_off, fl, reset ? "yes" : "no",
1569                hole ? "with" : "without", rc);
1570
1571         RETURN(rc);
1572 }
1573
1574 static int __lfsck_layout_update_pfid(const struct lu_env *env,
1575                                       struct dt_object *child,
1576                                       const struct lu_fid *pfid, __u32 offset)
1577 {
1578         struct dt_device        *dev    = lfsck_obj2dev(child);
1579         struct filter_fid       *ff     = &lfsck_env_info(env)->lti_new_pfid;
1580         struct thandle          *handle;
1581         struct lu_buf            buf    = { NULL };
1582         int                      rc;
1583
1584         ff->ff_parent.f_seq = cpu_to_le64(pfid->f_seq);
1585         ff->ff_parent.f_oid = cpu_to_le32(pfid->f_oid);
1586         /* Currently, the filter_fid::ff_parent::f_ver is not the real parent
1587          * MDT-object's FID::f_ver, instead it is the OST-object index in its
1588          * parent MDT-object's layout EA. */
1589         ff->ff_parent.f_stripe_idx = cpu_to_le32(offset);
1590         lfsck_buf_init(&buf, ff, sizeof(struct filter_fid));
1591
1592         handle = dt_trans_create(env, dev);
1593         if (IS_ERR(handle))
1594                 RETURN(PTR_ERR(handle));
1595
1596         rc = dt_declare_xattr_set(env, child, &buf, XATTR_NAME_FID, 0, handle);
1597         if (rc != 0)
1598                 GOTO(stop, rc);
1599
1600         rc = dt_trans_start_local(env, dev, handle);
1601         if (rc != 0)
1602                 GOTO(stop, rc);
1603
1604         rc = dt_xattr_set(env, child, &buf, XATTR_NAME_FID, 0, handle);
1605
1606         GOTO(stop, rc);
1607
1608 stop:
1609         dt_trans_stop(env, dev, handle);
1610
1611         return rc;
1612 }
1613
1614 /**
1615  * \retval       +1: repaired
1616  * \retval        0: did nothing
1617  * \retval      -ve: on error
1618  */
1619 static int lfsck_layout_update_pfid(const struct lu_env *env,
1620                                     struct lfsck_component *com,
1621                                     struct dt_object *parent,
1622                                     struct lu_fid *cfid,
1623                                     struct dt_device *cdev, __u32 ea_off)
1624 {
1625         struct dt_object        *child;
1626         int                      rc     = 0;
1627         ENTRY;
1628
1629         child = lfsck_object_find_by_dev(env, cdev, cfid);
1630         if (IS_ERR(child))
1631                 RETURN(PTR_ERR(child));
1632
1633         rc = __lfsck_layout_update_pfid(env, child,
1634                                         lu_object_fid(&parent->do_lu), ea_off);
1635         lfsck_object_put(env, child);
1636
1637         RETURN(rc == 0 ? 1 : rc);
1638 }
1639
1640 /**
1641  * This function will create the MDT-object with the given (partial) LOV EA.
1642  *
1643  * Under some data corruption cases, the MDT-object of the file may be lost,
1644  * but its OST-objects, or some of them are there. The layout LFSCK needs to
1645  * re-create the MDT-object with the orphan OST-object(s) information.
1646  *
1647  * On the other hand, the LFSCK may has created some OST-object for repairing
1648  * dangling LOV EA reference, but as the LFSCK processing, it may find that
1649  * the old OST-object is there and should replace the former new created OST
1650  * object. Unfortunately, some others have modified such newly created object.
1651  * To keep the data (both new and old), the LFSCK will create MDT-object with
1652  * new FID to reference the original OST-object.
1653  *
1654  * \param[in] env       pointer to the thread context
1655  * \param[in] com       pointer to the lfsck component
1656  * \param[in] ltd       pointer to target device descriptor
1657  * \param[in] rec       pointer to the record for the orphan OST-object
1658  * \param[in] cfid      pointer to FID for the orphan OST-object
1659  * \param[in] infix     additional information, such as the FID for original
1660  *                      MDT-object and the stripe offset in the LOV EA
1661  * \param[in] type      the type for describing why the orphan MDT-object is
1662  *                      created. The rules are as following:
1663  *
1664  *  type "C":           Multiple OST-objects claim the same MDT-object and the
1665  *                      same slot in the layout EA. Then the LFSCK will create
1666  *                      new MDT-object(s) to hold the conflict OST-object(s).
1667  *
1668  *  type "N":           The orphan OST-object does not know which one was the
1669  *                      real parent MDT-object, so the LFSCK uses new FID for
1670  *                      its parent MDT-object.
1671  *
1672  *  type "R":           The orphan OST-object knows its parent MDT-object FID,
1673  *                      but does not know the position (the file name) in the
1674  *                      layout.
1675  *
1676  *  type "D":           The MDT-object is a directory, it may knows its parent
1677  *                      but because there is no valid linkEA, the LFSCK cannot
1678  *                      know where to put it back to the namespace.
1679  *  type "O":           The MDT-object has no linkEA, and there is no name
1680  *                      entry that references the MDT-object.
1681  *
1682  *  type "P":           The orphan object to be created was a parent directory
1683  *                      of some MDT-object which linkEA shows that the @orphan
1684  *                      object is missing.
1685  *
1686  * The orphan name will be like:
1687  * ${FID}-${infix}-${type}-${conflict_version}
1688  *
1689  * \param[in] ea_off    the stripe offset in the LOV EA
1690  *
1691  * \retval              positive on repaired something
1692  * \retval              0 if needs to repair nothing
1693  * \retval              negative error number on failure
1694  */
1695 static int lfsck_layout_recreate_parent(const struct lu_env *env,
1696                                         struct lfsck_component *com,
1697                                         struct lfsck_tgt_desc *ltd,
1698                                         struct lu_orphan_rec *rec,
1699                                         struct lu_fid *cfid,
1700                                         const char *infix,
1701                                         const char *type,
1702                                         __u32 ea_off)
1703 {
1704         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1705         struct dt_insert_rec            *dtrec  = &info->lti_dt_rec;
1706         char                            *name   = info->lti_key;
1707         struct lu_attr                  *la     = &info->lti_la2;
1708         struct dt_object_format         *dof    = &info->lti_dof;
1709         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1710         struct lu_fid                   *pfid   = &rec->lor_fid;
1711         struct lu_fid                   *tfid   = &info->lti_fid3;
1712         struct dt_device                *dev    = lfsck->li_bottom;
1713         struct dt_object                *lpf    = lfsck->li_lpf_obj;
1714         struct dt_object                *pobj   = NULL;
1715         struct dt_object                *cobj   = NULL;
1716         struct thandle                  *th     = NULL;
1717         struct lu_buf                   *ea_buf = &info->lti_big_buf;
1718         struct lu_buf                    lov_buf;
1719         struct lfsck_lock_handle        *llh    = &info->lti_llh;
1720         struct linkea_data               ldata  = { NULL };
1721         struct lu_buf                    linkea_buf;
1722         const struct lu_name            *pname;
1723         int                              size   = 0;
1724         int                              idx    = 0;
1725         int                              rc     = 0;
1726         ENTRY;
1727
1728         if (unlikely(lpf == NULL))
1729                 GOTO(log, rc = -ENXIO);
1730
1731         /* We use two separated transactions to repair the inconsistency.
1732          *
1733          * 1) create the MDT-object locally.
1734          * 2) update the OST-object's PFID EA if necessary.
1735          *
1736          * If 1) succeed, but 2) failed, then the OST-object's PFID EA will be
1737          * updated when the layout LFSCK run next time.
1738          *
1739          * If 1) failed, but 2) succeed, then such MDT-object will be re-created
1740          * when the layout LFSCK run next time. */
1741
1742         if (fid_is_zero(pfid)) {
1743                 rc = lfsck_fid_alloc(env, lfsck, pfid, false);
1744                 if (rc != 0)
1745                         GOTO(log, rc);
1746
1747                 cobj = lfsck_object_find_by_dev(env, ltd->ltd_tgt, cfid);
1748                 if (IS_ERR(cobj))
1749                         GOTO(log, rc = PTR_ERR(cobj));
1750         }
1751
1752         pobj = lfsck_object_find_by_dev(env, dev, pfid);
1753         if (IS_ERR(pobj))
1754                 GOTO(log, rc = PTR_ERR(pobj));
1755
1756         LASSERT(infix != NULL);
1757         LASSERT(type != NULL);
1758
1759         memset(la, 0, sizeof(*la));
1760         la->la_uid = rec->lor_uid;
1761         la->la_gid = rec->lor_gid;
1762         la->la_mode = S_IFREG | S_IRUSR;
1763         la->la_valid = LA_MODE | LA_UID | LA_GID;
1764
1765         memset(dof, 0, sizeof(*dof));
1766         dof->dof_type = dt_mode_to_dft(S_IFREG);
1767         /* Because the dof->dof_reg.striped = 0, the LOD will not create
1768          * the stripe(s). The LFSCK will specify the LOV EA via
1769          * lfsck_layout_extend_lovea(). */
1770
1771         size = lov_mds_md_size(ea_off + 1, LOV_MAGIC_V1);
1772         if (ea_buf->lb_len < size) {
1773                 lu_buf_realloc(ea_buf, size);
1774                 if (ea_buf->lb_buf == NULL)
1775                         GOTO(log, rc = -ENOMEM);
1776         }
1777
1778 again:
1779         do {
1780                 snprintf(name, NAME_MAX, DFID"%s-%s-%d", PFID(pfid), infix,
1781                          type, idx++);
1782                 rc = dt_lookup(env, lfsck->li_lpf_obj, (struct dt_rec *)tfid,
1783                                (const struct dt_key *)name);
1784                 if (rc != 0 && rc != -ENOENT)
1785                         GOTO(log, rc);
1786         } while (rc == 0);
1787
1788         rc = lfsck_lock(env, lfsck, lfsck->li_lpf_obj, name, llh,
1789                         MDS_INODELOCK_UPDATE, LCK_PW);
1790         if (rc != 0)
1791                 GOTO(log, rc);
1792
1793         /* Re-check whether the name conflict with othrs after taken
1794          * the ldlm lock. */
1795         rc = dt_lookup(env, lfsck->li_lpf_obj, (struct dt_rec *)tfid,
1796                        (const struct dt_key *)name);
1797         if (unlikely(rc == 0)) {
1798                 lfsck_unlock(llh);
1799                 goto again;
1800         }
1801
1802         if (rc != -ENOENT)
1803                 GOTO(unlock, rc);
1804
1805         rc = linkea_data_new(&ldata,
1806                              &lfsck_env_info(env)->lti_linkea_buf);
1807         if (rc != 0)
1808                 GOTO(unlock, rc);
1809
1810         pname = lfsck_name_get_const(env, name, strlen(name));
1811         rc = linkea_add_buf(&ldata, pname, lfsck_dto2fid(lfsck->li_lpf_obj));
1812         if (rc != 0)
1813                 GOTO(unlock, rc);
1814
1815         /* The 1st transaction. */
1816         th = dt_trans_create(env, dev);
1817         if (IS_ERR(th))
1818                 GOTO(unlock, rc = PTR_ERR(th));
1819
1820         rc = dt_declare_create(env, pobj, la, NULL, dof, th);
1821         if (rc != 0)
1822                 GOTO(stop, rc);
1823
1824         lfsck_buf_init(&lov_buf, ea_buf->lb_buf, size);
1825         rc = dt_declare_xattr_set(env, pobj, &lov_buf, XATTR_NAME_LOV,
1826                                   LU_XATTR_REPLACE, th);
1827         if (rc != 0)
1828                 GOTO(stop, rc);
1829
1830         dtrec->rec_fid = pfid;
1831         dtrec->rec_type = S_IFREG;
1832         rc = dt_declare_insert(env, lpf,
1833                                (const struct dt_rec *)dtrec,
1834                                (const struct dt_key *)name, th);
1835         if (rc != 0)
1836                 GOTO(stop, rc);
1837
1838         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
1839                        ldata.ld_leh->leh_len);
1840         rc = dt_declare_xattr_set(env, pobj, &linkea_buf,
1841                                   XATTR_NAME_LINK, 0, th);
1842         if (rc != 0)
1843                 GOTO(stop, rc);
1844
1845         rc = dt_trans_start_local(env, dev, th);
1846         if (rc != 0)
1847                 GOTO(stop, rc);
1848
1849         dt_write_lock(env, pobj, 0);
1850         rc = dt_create(env, pobj, la, NULL, dof, th);
1851         if (rc == 0)
1852                 rc = lfsck_layout_extend_lovea(env, lfsck, th, pobj, cfid,
1853                                 &lov_buf, 0, ltd->ltd_index, ea_off, true);
1854         dt_write_unlock(env, pobj);
1855         if (rc < 0)
1856                 GOTO(stop, rc);
1857
1858         rc = dt_insert(env, lpf, (const struct dt_rec *)dtrec,
1859                        (const struct dt_key *)name, th, 1);
1860         if (rc != 0)
1861                 GOTO(stop, rc);
1862
1863         rc = dt_xattr_set(env, pobj, &linkea_buf, XATTR_NAME_LINK, 0, th);
1864         if (rc == 0 && cobj != NULL) {
1865                 dt_trans_stop(env, dev, th);
1866                 th = NULL;
1867
1868                 /* The 2nd transaction. */
1869                 rc = __lfsck_layout_update_pfid(env, cobj, pfid, ea_off);
1870         }
1871
1872         GOTO(stop, rc);
1873
1874 stop:
1875         if (th != NULL)
1876                 dt_trans_stop(env, dev, th);
1877
1878 unlock:
1879         lfsck_unlock(llh);
1880
1881 log:
1882         if (cobj != NULL && !IS_ERR(cobj))
1883                 lfsck_object_put(env, cobj);
1884         if (pobj != NULL && !IS_ERR(pobj))
1885                 lfsck_object_put(env, pobj);
1886
1887         if (rc < 0)
1888                 CDEBUG(D_LFSCK, "%s layout LFSCK assistant failed to "
1889                        "recreate the lost MDT-object: parent "DFID
1890                        ", child "DFID", OST-index %u, stripe-index %u, "
1891                        "infix %s, type %s: rc = %d\n",
1892                        lfsck_lfsck2name(lfsck), PFID(pfid), PFID(cfid),
1893                        ltd->ltd_index, ea_off, infix, type, rc);
1894
1895         return rc >= 0 ? 1 : rc;
1896 }
1897
1898 static int lfsck_layout_master_conditional_destroy(const struct lu_env *env,
1899                                                    struct lfsck_component *com,
1900                                                    const struct lu_fid *fid,
1901                                                    __u32 index)
1902 {
1903         struct lfsck_thread_info *info  = lfsck_env_info(env);
1904         struct lfsck_request     *lr    = &info->lti_lr;
1905         struct lfsck_instance    *lfsck = com->lc_lfsck;
1906         struct lfsck_tgt_desc    *ltd;
1907         struct ptlrpc_request    *req;
1908         struct lfsck_request     *tmp;
1909         struct obd_export        *exp;
1910         int                       rc    = 0;
1911         ENTRY;
1912
1913         ltd = lfsck_tgt_get(&lfsck->li_ost_descs, index);
1914         if (unlikely(ltd == NULL))
1915                 RETURN(-ENXIO);
1916
1917         exp = ltd->ltd_exp;
1918         if (!(exp_connect_flags(exp) & OBD_CONNECT_LFSCK))
1919                 GOTO(put, rc = -EOPNOTSUPP);
1920
1921         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LFSCK_NOTIFY);
1922         if (req == NULL)
1923                 GOTO(put, rc = -ENOMEM);
1924
1925         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_NOTIFY);
1926         if (rc != 0) {
1927                 ptlrpc_request_free(req);
1928
1929                 GOTO(put, rc);
1930         }
1931
1932         memset(lr, 0, sizeof(*lr));
1933         lr->lr_event = LE_CONDITIONAL_DESTROY;
1934         lr->lr_active = LFSCK_TYPE_LAYOUT;
1935         lr->lr_fid = *fid;
1936
1937         tmp = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
1938         *tmp = *lr;
1939         ptlrpc_request_set_replen(req);
1940
1941         rc = ptlrpc_queue_wait(req);
1942         ptlrpc_req_finished(req);
1943
1944         GOTO(put, rc);
1945
1946 put:
1947         lfsck_tgt_put(ltd);
1948
1949         return rc;
1950 }
1951
1952 static int lfsck_layout_slave_conditional_destroy(const struct lu_env *env,
1953                                                   struct lfsck_component *com,
1954                                                   struct lfsck_request *lr)
1955 {
1956         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1957         struct lu_attr                  *la     = &info->lti_la;
1958         union ldlm_policy_data          *policy = &info->lti_policy;
1959         struct ldlm_res_id              *resid  = &info->lti_resid;
1960         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1961         struct dt_device                *dev    = lfsck->li_bottom;
1962         struct lu_fid                   *fid    = &lr->lr_fid;
1963         struct dt_object                *obj;
1964         struct thandle                  *th     = NULL;
1965         struct lustre_handle             lh     = { 0 };
1966         __u64                            flags  = 0;
1967         int                              rc     = 0;
1968         ENTRY;
1969
1970         obj = lfsck_object_find_by_dev(env, dev, fid);
1971         if (IS_ERR(obj))
1972                 RETURN(PTR_ERR(obj));
1973
1974         dt_read_lock(env, obj, 0);
1975         if (dt_object_exists(obj) == 0 ||
1976             lfsck_is_dead_obj(obj)) {
1977                 dt_read_unlock(env, obj);
1978
1979                 GOTO(put, rc = -ENOENT);
1980         }
1981
1982         /* Get obj's attr without lock firstly. */
1983         rc = dt_attr_get(env, obj, la);
1984         dt_read_unlock(env, obj);
1985         if (rc != 0)
1986                 GOTO(put, rc);
1987
1988         if (likely(la->la_ctime != 0 || la->la_mode & S_ISUID))
1989                 GOTO(put, rc = -ETXTBSY);
1990
1991         /* Acquire extent lock on [0, EOF] to sync with all possible written. */
1992         LASSERT(lfsck->li_namespace != NULL);
1993
1994         memset(policy, 0, sizeof(*policy));
1995         policy->l_extent.end = OBD_OBJECT_EOF;
1996         ost_fid_build_resid(fid, resid);
1997         rc = ldlm_cli_enqueue_local(lfsck->li_namespace, resid, LDLM_EXTENT,
1998                                     policy, LCK_EX, &flags, ldlm_blocking_ast,
1999                                     ldlm_completion_ast, NULL, NULL, 0,
2000                                     LVB_T_NONE, NULL, &lh);
2001         if (rc != ELDLM_OK)
2002                 GOTO(put, rc = -EIO);
2003
2004         dt_write_lock(env, obj, 0);
2005         /* Get obj's attr within lock again. */
2006         rc = dt_attr_get(env, obj, la);
2007         if (rc != 0)
2008                 GOTO(unlock, rc);
2009
2010         if (la->la_ctime != 0)
2011                 GOTO(unlock, rc = -ETXTBSY);
2012
2013         th = dt_trans_create(env, dev);
2014         if (IS_ERR(th))
2015                 GOTO(unlock, rc = PTR_ERR(th));
2016
2017         rc = dt_declare_ref_del(env, obj, th);
2018         if (rc != 0)
2019                 GOTO(stop, rc);
2020
2021         rc = dt_declare_destroy(env, obj, th);
2022         if (rc != 0)
2023                 GOTO(stop, rc);
2024
2025         rc = dt_trans_start_local(env, dev, th);
2026         if (rc != 0)
2027                 GOTO(stop, rc);
2028
2029         rc = dt_ref_del(env, obj, th);
2030         if (rc != 0)
2031                 GOTO(stop, rc);
2032
2033         rc = dt_destroy(env, obj, th);
2034         if (rc == 0)
2035                 CDEBUG(D_LFSCK, "%s: layout LFSCK destroyed the empty "
2036                        "OST-object "DFID" that was created for reparing "
2037                        "dangling referenced case. But the original missing "
2038                        "OST-object is found now.\n",
2039                        lfsck_lfsck2name(lfsck), PFID(fid));
2040
2041         GOTO(stop, rc);
2042
2043 stop:
2044         dt_trans_stop(env, dev, th);
2045
2046 unlock:
2047         dt_write_unlock(env, obj);
2048         ldlm_lock_decref(&lh, LCK_EX);
2049
2050 put:
2051         lfsck_object_put(env, obj);
2052
2053         return rc;
2054 }
2055
2056 /**
2057  * Some OST-object has occupied the specified layout EA slot.
2058  * Such OST-object may be generated by the LFSCK when repair
2059  * dangling referenced MDT-object, which can be indicated by
2060  * attr::la_ctime == 0 but without S_ISUID in la_mode. If it
2061  * is true and such OST-object has not been modified yet, we
2062  * will replace it with the orphan OST-object; otherwise the
2063  * LFSCK will create new MDT-object to reference the orphan.
2064  *
2065  * \retval       +1: repaired
2066  * \retval        0: did nothing
2067  * \retval      -ve: on error
2068  */
2069 static int lfsck_layout_conflict_create(const struct lu_env *env,
2070                                         struct lfsck_component *com,
2071                                         struct lfsck_tgt_desc *ltd,
2072                                         struct lu_orphan_rec *rec,
2073                                         struct dt_object *parent,
2074                                         struct lu_fid *cfid,
2075                                         struct lu_buf *ea_buf,
2076                                         struct lov_ost_data_v1 *slot,
2077                                         __u32 ea_off)
2078 {
2079         struct lfsck_thread_info *info          = lfsck_env_info(env);
2080         struct lu_fid            *cfid2         = &info->lti_fid2;
2081         struct ost_id            *oi            = &info->lti_oi;
2082         struct lov_mds_md_v1     *lmm           = ea_buf->lb_buf;
2083         struct dt_device         *dev           = lfsck_obj2dev(parent);
2084         struct thandle           *th            = NULL;
2085         struct lustre_handle      lh            = { 0 };
2086         __u32                     ost_idx2      = le32_to_cpu(slot->l_ost_idx);
2087         int                       rc            = 0;
2088         ENTRY;
2089
2090         ostid_le_to_cpu(&slot->l_ost_oi, oi);
2091         rc = ostid_to_fid(cfid2, oi, ost_idx2);
2092         if (rc != 0)
2093                 GOTO(out, rc);
2094
2095         rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
2096                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2097                               LCK_EX);
2098         if (rc != 0)
2099                 GOTO(out, rc);
2100
2101         rc = lfsck_layout_master_conditional_destroy(env, com, cfid2, ost_idx2);
2102
2103         /* If the conflict OST-obejct is not created for fixing dangling
2104          * referenced MDT-object in former LFSCK check/repair, or it has
2105          * been modified by others, then we cannot destroy it. Re-create
2106          * a new MDT-object for the orphan OST-object. */
2107         if (rc == -ETXTBSY) {
2108                 /* No need the layout lock on the original parent. */
2109                 lfsck_ibits_unlock(&lh, LCK_EX);
2110
2111                 fid_zero(&rec->lor_fid);
2112                 snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2113                          "-"DFID"-%x", PFID(lu_object_fid(&parent->do_lu)),
2114                          ea_off);
2115                 rc = lfsck_layout_recreate_parent(env, com, ltd, rec, cfid,
2116                                                 info->lti_tmpbuf, "C", ea_off);
2117
2118                 RETURN(rc);
2119         }
2120
2121         if (rc != 0 && rc != -ENOENT)
2122                 GOTO(unlock, rc);
2123
2124         th = dt_trans_create(env, dev);
2125         if (IS_ERR(th))
2126                 GOTO(unlock, rc = PTR_ERR(th));
2127
2128         rc = dt_declare_xattr_set(env, parent, ea_buf, XATTR_NAME_LOV,
2129                                   LU_XATTR_REPLACE, th);
2130         if (rc != 0)
2131                 GOTO(stop, rc);
2132
2133         rc = dt_trans_start_local(env, dev, th);
2134         if (rc != 0)
2135                 GOTO(stop, rc);
2136
2137         dt_write_lock(env, parent, 0);
2138         lmm->lmm_layout_gen = cpu_to_le16(le16_to_cpu(lmm->lmm_layout_gen) + 1);
2139         rc = lfsck_layout_refill_lovea(env, th, parent, cfid, ea_buf, slot,
2140                                        LU_XATTR_REPLACE, ltd->ltd_index);
2141         dt_write_unlock(env, parent);
2142
2143         GOTO(stop, rc);
2144
2145 stop:
2146         dt_trans_stop(env, dev, th);
2147
2148 unlock:
2149         lfsck_ibits_unlock(&lh, LCK_EX);
2150
2151 out:
2152         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant replaced the conflict "
2153                "OST-object "DFID" on the OST %x with the orphan "DFID" on "
2154                "the OST %x: parent "DFID", stripe-index %u: rc = %d\n",
2155                lfsck_lfsck2name(com->lc_lfsck), PFID(cfid2), ost_idx2,
2156                PFID(cfid), ltd->ltd_index, PFID(lfsck_dto2fid(parent)),
2157                ea_off, rc);
2158
2159         return rc >= 0 ? 1 : rc;
2160 }
2161
2162 /**
2163  * \retval       +1: repaired
2164  * \retval        0: did nothing
2165  * \retval      -ve: on error
2166  */
2167 static int lfsck_layout_recreate_lovea(const struct lu_env *env,
2168                                        struct lfsck_component *com,
2169                                        struct lfsck_tgt_desc *ltd,
2170                                        struct lu_orphan_rec *rec,
2171                                        struct dt_object *parent,
2172                                        struct lu_fid *cfid,
2173                                        __u32 ost_idx, __u32 ea_off)
2174 {
2175         struct lfsck_thread_info *info          = lfsck_env_info(env);
2176         struct lu_buf            *buf           = &info->lti_big_buf;
2177         struct lu_fid            *fid           = &info->lti_fid2;
2178         struct ost_id            *oi            = &info->lti_oi;
2179         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2180         struct dt_device         *dt            = lfsck_obj2dev(parent);
2181         struct lfsck_bookmark    *bk            = &lfsck->li_bookmark_ram;
2182         struct thandle            *handle       = NULL;
2183         size_t                    lovea_size;
2184         struct lov_mds_md_v1     *lmm;
2185         struct lov_ost_data_v1   *objs;
2186         struct lustre_handle      lh            = { 0 };
2187         __u32                     magic;
2188         int                       fl            = 0;
2189         int                       rc            = 0;
2190         int                       rc1;
2191         int                       i;
2192         __u16                     count;
2193         bool                      locked        = false;
2194         ENTRY;
2195
2196         rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
2197                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2198                               LCK_EX);
2199         if (rc != 0) {
2200                 CDEBUG(D_LFSCK, "%s: layout LFSCK assistant failed to recreate "
2201                        "LOV EA for "DFID": parent "DFID", OST-index %u, "
2202                        "stripe-index %u: rc = %d\n",
2203                        lfsck_lfsck2name(lfsck), PFID(cfid),
2204                        PFID(lfsck_dto2fid(parent)), ost_idx, ea_off, rc);
2205
2206                 RETURN(rc);
2207         }
2208
2209 again:
2210         if (locked) {
2211                 dt_write_unlock(env, parent);
2212                 locked = false;
2213         }
2214
2215         if (handle != NULL) {
2216                 dt_trans_stop(env, dt, handle);
2217                 handle = NULL;
2218         }
2219
2220         if (rc < 0)
2221                 GOTO(unlock_layout, rc);
2222
2223         lovea_size = rc;
2224         if (buf->lb_len < lovea_size) {
2225                 lu_buf_realloc(buf, lovea_size);
2226                 if (buf->lb_buf == NULL)
2227                         GOTO(unlock_layout, rc = -ENOMEM);
2228         }
2229
2230         if (!(bk->lb_param & LPF_DRYRUN)) {
2231                 handle = dt_trans_create(env, dt);
2232                 if (IS_ERR(handle))
2233                         GOTO(unlock_layout, rc = PTR_ERR(handle));
2234
2235                 rc = dt_declare_xattr_set(env, parent, buf, XATTR_NAME_LOV,
2236                                           fl, handle);
2237                 if (rc != 0)
2238                         GOTO(stop, rc);
2239
2240                 rc = dt_trans_start_local(env, dt, handle);
2241                 if (rc != 0)
2242                         GOTO(stop, rc);
2243         }
2244
2245         dt_write_lock(env, parent, 0);
2246         locked = true;
2247         rc = dt_xattr_get(env, parent, buf, XATTR_NAME_LOV);
2248         if (rc == -ERANGE) {
2249                 rc = dt_xattr_get(env, parent, &LU_BUF_NULL, XATTR_NAME_LOV);
2250                 LASSERT(rc != 0);
2251                 goto again;
2252         } else if (rc == -ENODATA || rc == 0) {
2253                 lovea_size = lov_mds_md_size(ea_off + 1, LOV_MAGIC_V1);
2254                 /* If the declared is not big enough, re-try. */
2255                 if (buf->lb_len < lovea_size) {
2256                         rc = lovea_size;
2257                         goto again;
2258                 }
2259                 fl = LU_XATTR_CREATE;
2260         } else if (rc < 0) {
2261                 GOTO(unlock_parent, rc);
2262         } else if (unlikely(buf->lb_len == 0)) {
2263                 goto again;
2264         } else {
2265                 fl = LU_XATTR_REPLACE;
2266                 lovea_size = rc;
2267         }
2268
2269         if (fl == LU_XATTR_CREATE) {
2270                 if (bk->lb_param & LPF_DRYRUN)
2271                         GOTO(unlock_parent, rc = 1);
2272
2273                 LASSERT(buf->lb_len >= lovea_size);
2274
2275                 rc = lfsck_layout_extend_lovea(env, lfsck, handle, parent, cfid,
2276                                                buf, fl, ost_idx, ea_off, false);
2277
2278                 GOTO(unlock_parent, rc);
2279         }
2280
2281         lmm = buf->lb_buf;
2282         rc1 = lfsck_layout_verify_header(lmm);
2283
2284         /* If the LOV EA crashed, the rebuild it. */
2285         if (rc1 == -EINVAL) {
2286                 if (bk->lb_param & LPF_DRYRUN)
2287                         GOTO(unlock_parent, rc = 1);
2288
2289                 LASSERT(buf->lb_len >= lovea_size);
2290
2291                 rc = lfsck_layout_extend_lovea(env, lfsck, handle, parent, cfid,
2292                                                buf, fl, ost_idx, ea_off, true);
2293
2294                 GOTO(unlock_parent, rc);
2295         }
2296
2297         /* For other unknown magic/pattern, keep the current LOV EA. */
2298         if (rc1 != 0)
2299                 GOTO(unlock_parent, rc = rc1);
2300
2301         /* Currently, we only support LOV_MAGIC_V1/LOV_MAGIC_V3 which has
2302          * been verified in lfsck_layout_verify_header() already. If some
2303          * new magic introduced in the future, then layout LFSCK needs to
2304          * be updated also. */
2305         magic = le32_to_cpu(lmm->lmm_magic);
2306         if (magic == LOV_MAGIC_V1) {
2307                 objs = &lmm->lmm_objects[0];
2308         } else {
2309                 LASSERT(magic == LOV_MAGIC_V3);
2310                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
2311         }
2312
2313         count = le16_to_cpu(lmm->lmm_stripe_count);
2314         if (count == 0)
2315                 GOTO(unlock_parent, rc = -EINVAL);
2316         LASSERT(count > 0);
2317
2318         /* Exceed the current end of MDT-object layout EA. Then extend it. */
2319         if (count <= ea_off) {
2320                 if (bk->lb_param & LPF_DRYRUN)
2321                         GOTO(unlock_parent, rc = 1);
2322
2323                 lovea_size = lov_mds_md_size(ea_off + 1, magic);
2324                 /* If the declared is not big enough, re-try. */
2325                 if (buf->lb_len < lovea_size) {
2326                         rc = lovea_size;
2327                         goto again;
2328                 }
2329
2330                 rc = lfsck_layout_extend_lovea(env, lfsck, handle, parent, cfid,
2331                                                buf, fl, ost_idx, ea_off, false);
2332
2333                 GOTO(unlock_parent, rc);
2334         }
2335
2336         LASSERTF(rc > 0, "invalid rc = %d\n", rc);
2337
2338         for (i = 0; i < count; i++, objs++) {
2339                 /* The MDT-object was created via lfsck_layout_recover_create()
2340                  * by others before, and we fill the dummy layout EA. */
2341                 if (lovea_slot_is_dummy(objs)) {
2342                         if (i != ea_off)
2343                                 continue;
2344
2345                         if (bk->lb_param & LPF_DRYRUN)
2346                                 GOTO(unlock_parent, rc = 1);
2347
2348                         lmm->lmm_layout_gen =
2349                             cpu_to_le16(le16_to_cpu(lmm->lmm_layout_gen) + 1);
2350                         rc = lfsck_layout_refill_lovea(env, handle, parent,
2351                                                        cfid, buf, objs, fl,
2352                                                        ost_idx);
2353
2354                         CDEBUG(D_LFSCK, "%s layout LFSCK assistant fill "
2355                                "dummy layout slot for "DFID": parent "DFID
2356                                ", OST-index %u, stripe-index %u: rc = %d\n",
2357                                lfsck_lfsck2name(lfsck), PFID(cfid),
2358                                PFID(lfsck_dto2fid(parent)), ost_idx, i, rc);
2359
2360                         GOTO(unlock_parent, rc);
2361                 }
2362
2363                 ostid_le_to_cpu(&objs->l_ost_oi, oi);
2364                 rc = ostid_to_fid(fid, oi, le32_to_cpu(objs->l_ost_idx));
2365                 if (rc != 0) {
2366                         CDEBUG(D_LFSCK, "%s: the parent "DFID" contains "
2367                                "invalid layout EA at the slot %d, index %u\n",
2368                                lfsck_lfsck2name(lfsck),
2369                                PFID(lfsck_dto2fid(parent)), i,
2370                                le32_to_cpu(objs->l_ost_idx));
2371
2372                         GOTO(unlock_parent, rc);
2373                 }
2374
2375                 /* It should be rare case, the slot is there, but the LFSCK
2376                  * does not handle it during the first-phase cycle scanning. */
2377                 if (unlikely(lu_fid_eq(fid, cfid))) {
2378                         if (i == ea_off) {
2379                                 GOTO(unlock_parent, rc = 0);
2380                         } else {
2381                                 /* Rare case that the OST-object index
2382                                  * does not match the parent MDT-object
2383                                  * layout EA. We trust the later one. */
2384                                 if (bk->lb_param & LPF_DRYRUN)
2385                                         GOTO(unlock_parent, rc = 1);
2386
2387                                 dt_write_unlock(env, parent);
2388                                 if (handle != NULL)
2389                                         dt_trans_stop(env, dt, handle);
2390                                 lfsck_ibits_unlock(&lh, LCK_EX);
2391                                 rc = lfsck_layout_update_pfid(env, com, parent,
2392                                                         cfid, ltd->ltd_tgt, i);
2393
2394                                 CDEBUG(D_LFSCK, "%s layout LFSCK assistant "
2395                                        "updated OST-object's pfid for "DFID
2396                                        ": parent "DFID", OST-index %u, "
2397                                        "stripe-index %u: rc = %d\n",
2398                                        lfsck_lfsck2name(lfsck), PFID(cfid),
2399                                        PFID(lfsck_dto2fid(parent)),
2400                                        ltd->ltd_index, i, rc);
2401
2402                                 RETURN(rc);
2403                         }
2404                 }
2405         }
2406
2407         /* The MDT-object exists, but related layout EA slot is occupied
2408          * by others. */
2409         if (bk->lb_param & LPF_DRYRUN)
2410                 GOTO(unlock_parent, rc = 1);
2411
2412         dt_write_unlock(env, parent);
2413         if (handle != NULL)
2414                 dt_trans_stop(env, dt, handle);
2415         lfsck_ibits_unlock(&lh, LCK_EX);
2416         if (le32_to_cpu(lmm->lmm_magic) == LOV_MAGIC_V1)
2417                 objs = &lmm->lmm_objects[ea_off];
2418         else
2419                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[ea_off];
2420         rc = lfsck_layout_conflict_create(env, com, ltd, rec, parent, cfid,
2421                                           buf, objs, ea_off);
2422
2423         RETURN(rc);
2424
2425 unlock_parent:
2426         if (locked)
2427                 dt_write_unlock(env, parent);
2428
2429 stop:
2430         if (handle != NULL)
2431                 dt_trans_stop(env, dt, handle);
2432
2433 unlock_layout:
2434         lfsck_ibits_unlock(&lh, LCK_EX);
2435
2436         return rc;
2437 }
2438
2439 static int lfsck_layout_scan_orphan_one(const struct lu_env *env,
2440                                         struct lfsck_component *com,
2441                                         struct lfsck_tgt_desc *ltd,
2442                                         struct lu_orphan_rec *rec,
2443                                         struct lu_fid *cfid)
2444 {
2445         struct lfsck_layout     *lo     = com->lc_file_ram;
2446         struct lu_fid           *pfid   = &rec->lor_fid;
2447         struct dt_object        *parent = NULL;
2448         __u32                    ea_off = pfid->f_stripe_idx;
2449         int                      rc     = 0;
2450         ENTRY;
2451
2452         if (!fid_is_sane(cfid))
2453                 GOTO(out, rc = -EINVAL);
2454
2455         if (fid_is_zero(pfid)) {
2456                 rc = lfsck_layout_recreate_parent(env, com, ltd, rec, cfid,
2457                                                   "", "N", ea_off);
2458                 GOTO(out, rc);
2459         }
2460
2461         pfid->f_ver = 0;
2462         if (!fid_is_sane(pfid))
2463                 GOTO(out, rc = -EINVAL);
2464
2465         parent = lfsck_object_find_by_dev(env, com->lc_lfsck->li_bottom, pfid);
2466         if (IS_ERR(parent))
2467                 GOTO(out, rc = PTR_ERR(parent));
2468
2469         if (unlikely(dt_object_remote(parent) != 0))
2470                 GOTO(put, rc = -EXDEV);
2471
2472         if (dt_object_exists(parent) == 0) {
2473                 lfsck_object_put(env, parent);
2474                 rc = lfsck_layout_recreate_parent(env, com, ltd, rec, cfid,
2475                                                   "", "R", ea_off);
2476                 GOTO(out, rc);
2477         }
2478
2479         if (!S_ISREG(lu_object_attr(&parent->do_lu)))
2480                 GOTO(put, rc = -EISDIR);
2481
2482         rc = lfsck_layout_recreate_lovea(env, com, ltd, rec, parent, cfid,
2483                                          ltd->ltd_index, ea_off);
2484
2485         GOTO(put, rc);
2486
2487 put:
2488         if (rc <= 0)
2489                 lfsck_object_put(env, parent);
2490         else
2491                 /* The layout EA is changed, need to be reloaded next time. */
2492                 lu_object_put_nocache(env, &parent->do_lu);
2493
2494 out:
2495         down_write(&com->lc_sem);
2496         com->lc_new_scanned++;
2497         com->lc_new_checked++;
2498         if (rc > 0) {
2499                 lo->ll_objs_repaired[LLIT_ORPHAN - 1]++;
2500                 rc = 0;
2501         } else if (rc < 0) {
2502                 lo->ll_objs_failed_phase2++;
2503         }
2504         up_write(&com->lc_sem);
2505
2506         return rc;
2507 }
2508
2509 static int lfsck_layout_scan_orphan(const struct lu_env *env,
2510                                     struct lfsck_component *com,
2511                                     struct lfsck_tgt_desc *ltd)
2512 {
2513         struct lfsck_assistant_data     *lad    = com->lc_data;
2514         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2515         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
2516         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2517         struct ost_id                   *oi     = &info->lti_oi;
2518         struct lu_fid                   *fid    = &info->lti_fid;
2519         struct dt_object                *obj;
2520         const struct dt_it_ops          *iops;
2521         struct dt_it                    *di;
2522         int                              rc     = 0;
2523         ENTRY;
2524
2525         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant starts the orphan "
2526                "scanning for OST%04x\n",
2527                lfsck_lfsck2name(lfsck), ltd->ltd_index);
2528
2529         if (cfs_bitmap_check(lad->lad_bitmap, ltd->ltd_index)) {
2530                 CDEBUG(D_LFSCK, "%s: layout LFSCK assistant skip the orphan "
2531                        "scanning for OST%04x\n",
2532                        lfsck_lfsck2name(lfsck), ltd->ltd_index);
2533
2534                 RETURN(0);
2535         }
2536
2537         ostid_set_seq(oi, FID_SEQ_IDIF);
2538         ostid_set_id(oi, 0);
2539         rc = ostid_to_fid(fid, oi, ltd->ltd_index);
2540         if (rc != 0)
2541                 GOTO(log, rc);
2542
2543         obj = lfsck_object_find_by_dev(env, ltd->ltd_tgt, fid);
2544         if (unlikely(IS_ERR(obj)))
2545                 GOTO(log, rc = PTR_ERR(obj));
2546
2547         rc = obj->do_ops->do_index_try(env, obj, &dt_lfsck_orphan_features);
2548         if (rc != 0)
2549                 GOTO(put, rc);
2550
2551         iops = &obj->do_index_ops->dio_it;
2552         di = iops->init(env, obj, 0);
2553         if (IS_ERR(di))
2554                 GOTO(put, rc = PTR_ERR(di));
2555
2556         rc = iops->load(env, di, 0);
2557         if (rc == -ESRCH) {
2558                 /* -ESRCH means that the orphan OST-objects rbtree has been
2559                  * cleanup because of the OSS server restart or other errors. */
2560                 lfsck_lad_set_bitmap(env, com, ltd->ltd_index);
2561                 GOTO(fini, rc);
2562         }
2563
2564         if (rc == 0)
2565                 rc = iops->next(env, di);
2566         else if (rc > 0)
2567                 rc = 0;
2568
2569         if (rc < 0)
2570                 GOTO(fini, rc);
2571
2572         if (rc > 0)
2573                 GOTO(fini, rc = 0);
2574
2575         do {
2576                 struct dt_key           *key;
2577                 struct lu_orphan_rec    *rec = &info->lti_rec;
2578
2579                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY3, cfs_fail_val) &&
2580                     unlikely(!thread_is_running(&lfsck->li_thread)))
2581                         break;
2582
2583                 key = iops->key(env, di);
2584                 com->lc_fid_latest_scanned_phase2 = *(struct lu_fid *)key;
2585                 rc = iops->rec(env, di, (struct dt_rec *)rec, 0);
2586                 if (rc == 0)
2587                         rc = lfsck_layout_scan_orphan_one(env, com, ltd, rec,
2588                                         &com->lc_fid_latest_scanned_phase2);
2589                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
2590                         GOTO(fini, rc);
2591
2592                 lfsck_control_speed_by_self(com);
2593                 do {
2594                         rc = iops->next(env, di);
2595                 } while (rc < 0 && !(bk->lb_param & LPF_FAILOUT));
2596         } while (rc == 0);
2597
2598         GOTO(fini, rc);
2599
2600 fini:
2601         iops->put(env, di);
2602         iops->fini(env, di);
2603 put:
2604         lfsck_object_put(env, obj);
2605
2606 log:
2607         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant finished the orphan "
2608                "scanning for OST%04x: rc = %d\n",
2609                lfsck_lfsck2name(lfsck), ltd->ltd_index, rc);
2610
2611         return rc > 0 ? 0 : rc;
2612 }
2613
2614 /* For the MDT-object with dangling reference, we need to repare the
2615  * inconsistency according to the LFSCK sponsor's requirement:
2616  *
2617  * 1) Keep the inconsistency there and report the inconsistency case,
2618  *    then give the chance to the application to find related issues,
2619  *    and the users can make the decision about how to handle it with
2620  *    more human knownledge. (by default)
2621  *
2622  * 2) Re-create the missing OST-object with the FID/owner information. */
2623 static int lfsck_layout_repair_dangling(const struct lu_env *env,
2624                                         struct lfsck_component *com,
2625                                         struct dt_object *parent,
2626                                         struct lfsck_layout_req *llr,
2627                                         struct lu_attr *la)
2628 {
2629         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2630         struct filter_fid               *pfid   = &info->lti_new_pfid;
2631         struct dt_object_format         *dof    = &info->lti_dof;
2632         struct dt_object                *child  = llr->llr_child;
2633         struct dt_device                *dev    = lfsck_obj2dev(child);
2634         const struct lu_fid             *tfid   = lu_object_fid(&parent->do_lu);
2635         struct thandle                  *handle;
2636         struct lu_buf                   *buf;
2637         struct lustre_handle             lh     = { 0 };
2638         int                              rc;
2639         bool                             create;
2640         ENTRY;
2641
2642         if (com->lc_lfsck->li_bookmark_ram.lb_param & LPF_CREATE_OSTOBJ)
2643                 create = true;
2644         else
2645                 create = false;
2646
2647         if (!create)
2648                 GOTO(log, rc = 1);
2649
2650         rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
2651                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2652                               LCK_EX);
2653         if (rc != 0)
2654                 GOTO(log, rc);
2655
2656         rc = dt_attr_get(env, parent, la);
2657         if (rc != 0)
2658                 GOTO(unlock1, rc);
2659
2660         la->la_mode = S_IFREG | 0666;
2661         la->la_atime = la->la_mtime = la->la_ctime = 0;
2662         la->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
2663                        LA_ATIME | LA_MTIME | LA_CTIME;
2664         memset(dof, 0, sizeof(*dof));
2665         pfid->ff_parent.f_seq = cpu_to_le64(tfid->f_seq);
2666         pfid->ff_parent.f_oid = cpu_to_le32(tfid->f_oid);
2667         /* Currently, the filter_fid::ff_parent::f_ver is not the real parent
2668          * MDT-object's FID::f_ver, instead it is the OST-object index in its
2669          * parent MDT-object's layout EA. */
2670         pfid->ff_parent.f_stripe_idx = cpu_to_le32(llr->llr_lov_idx);
2671         buf = lfsck_buf_get(env, pfid, sizeof(struct filter_fid));
2672
2673         handle = dt_trans_create(env, dev);
2674         if (IS_ERR(handle))
2675                 GOTO(unlock1, rc = PTR_ERR(handle));
2676
2677         rc = dt_declare_create(env, child, la, NULL, dof, handle);
2678         if (rc != 0)
2679                 GOTO(stop, rc);
2680
2681         rc = dt_declare_xattr_set(env, child, buf, XATTR_NAME_FID,
2682                                   LU_XATTR_CREATE, handle);
2683         if (rc != 0)
2684                 GOTO(stop, rc);
2685
2686         rc = dt_trans_start_local(env, dev, handle);
2687         if (rc != 0)
2688                 GOTO(stop, rc);
2689
2690         dt_read_lock(env, parent, 0);
2691         if (unlikely(lfsck_is_dead_obj(parent)))
2692                 GOTO(unlock2, rc = 1);
2693
2694         rc = dt_create(env, child, la, NULL, dof, handle);
2695         if (rc != 0)
2696                 GOTO(unlock2, rc);
2697
2698         rc = dt_xattr_set(env, child, buf, XATTR_NAME_FID, LU_XATTR_CREATE,
2699                           handle);
2700
2701         GOTO(unlock2, rc);
2702
2703 unlock2:
2704         dt_read_unlock(env, parent);
2705
2706 stop:
2707         rc = lfsck_layout_trans_stop(env, dev, handle, rc);
2708
2709 unlock1:
2710         lfsck_ibits_unlock(&lh, LCK_EX);
2711
2712 log:
2713         if (rc != 0)
2714                 CDEBUG(D_LFSCK, "%s: layout LFSCK assistant found "
2715                        "dangling reference for: parent "DFID", child "DFID
2716                        ", OST-index %u, stripe-index %u, owner %u/%u. %s: "
2717                        "rc = %d\n", lfsck_lfsck2name(com->lc_lfsck),
2718                        PFID(lfsck_dto2fid(parent)), PFID(lfsck_dto2fid(child)),
2719                        llr->llr_ost_idx, llr->llr_lov_idx,
2720                        la->la_uid, la->la_gid,
2721                        create ? "Create the lost OST-object as required" :
2722                                 "Keep the MDT-object there by default", rc);
2723
2724         return rc;
2725 }
2726
2727 /* If the OST-object does not recognize the MDT-object as its parent, and
2728  * there is no other MDT-object claims as its parent, then just trust the
2729  * given MDT-object as its parent. So update the OST-object filter_fid. */
2730 static int lfsck_layout_repair_unmatched_pair(const struct lu_env *env,
2731                                               struct lfsck_component *com,
2732                                               struct dt_object *parent,
2733                                               struct lfsck_layout_req *llr,
2734                                               struct lu_attr *la)
2735 {
2736         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2737         struct filter_fid               *pfid   = &info->lti_new_pfid;
2738         struct dt_object                *child  = llr->llr_child;
2739         struct dt_device                *dev    = lfsck_obj2dev(child);
2740         const struct lu_fid             *tfid   = lu_object_fid(&parent->do_lu);
2741         struct thandle                  *handle;
2742         struct lu_buf                   *buf;
2743         struct lustre_handle             lh     = { 0 };
2744         int                              rc;
2745         ENTRY;
2746
2747         rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
2748                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2749                               LCK_EX);
2750         if (rc != 0)
2751                 GOTO(log, rc);
2752
2753         pfid->ff_parent.f_seq = cpu_to_le64(tfid->f_seq);
2754         pfid->ff_parent.f_oid = cpu_to_le32(tfid->f_oid);
2755         /* Currently, the filter_fid::ff_parent::f_ver is not the real parent
2756          * MDT-object's FID::f_ver, instead it is the OST-object index in its
2757          * parent MDT-object's layout EA. */
2758         pfid->ff_parent.f_stripe_idx = cpu_to_le32(llr->llr_lov_idx);
2759         buf = lfsck_buf_get(env, pfid, sizeof(struct filter_fid));
2760
2761         handle = dt_trans_create(env, dev);
2762         if (IS_ERR(handle))
2763                 GOTO(unlock1, rc = PTR_ERR(handle));
2764
2765         rc = dt_declare_xattr_set(env, child, buf, XATTR_NAME_FID, 0, handle);
2766         if (rc != 0)
2767                 GOTO(stop, rc);
2768
2769         rc = dt_attr_get(env, parent, la);
2770         if (rc != 0)
2771                 GOTO(stop, rc);
2772
2773         la->la_valid = LA_UID | LA_GID;
2774         rc = dt_declare_attr_set(env, child, la, handle);
2775         if (rc != 0)
2776                 GOTO(stop, rc);
2777
2778         rc = dt_trans_start_local(env, dev, handle);
2779         if (rc != 0)
2780                 GOTO(stop, rc);
2781
2782         dt_write_lock(env, parent, 0);
2783         if (unlikely(lfsck_is_dead_obj(parent)))
2784                 GOTO(unlock2, rc = 1);
2785
2786         rc = dt_xattr_set(env, child, buf, XATTR_NAME_FID, 0, handle);
2787         if (rc != 0)
2788                 GOTO(unlock2, rc);
2789
2790         /* Get the latest parent's owner. */
2791         rc = dt_attr_get(env, parent, la);
2792         if (rc != 0)
2793                 GOTO(unlock2, rc);
2794
2795         la->la_valid = LA_UID | LA_GID;
2796         rc = dt_attr_set(env, child, la, handle);
2797
2798         GOTO(unlock2, rc);
2799
2800 unlock2:
2801         dt_write_unlock(env, parent);
2802
2803 stop:
2804         rc = lfsck_layout_trans_stop(env, dev, handle, rc);
2805
2806 unlock1:
2807         lfsck_ibits_unlock(&lh, LCK_EX);
2808
2809 log:
2810         if (rc != 0)
2811                 CDEBUG(D_LFSCK, "%s: layout LFSCK assistant repaired "
2812                        "unmatched MDT-OST pair for: parent "DFID
2813                        ", child "DFID", OST-index %u, stripe-index %u, "
2814                        "owner %u/%u: rc = %d\n",
2815                        lfsck_lfsck2name(com->lc_lfsck),
2816                        PFID(lfsck_dto2fid(parent)),
2817                        PFID(lfsck_dto2fid(child)),
2818                        llr->llr_ost_idx, llr->llr_lov_idx,
2819                        la->la_uid, la->la_gid, rc);
2820
2821         return rc;
2822 }
2823
2824 /* If there are more than one MDT-objects claim as the OST-object's parent,
2825  * and the OST-object only recognizes one of them, then we need to generate
2826  * new OST-object(s) with new fid(s) for the non-recognized MDT-object(s). */
2827 static int lfsck_layout_repair_multiple_references(const struct lu_env *env,
2828                                                    struct lfsck_component *com,
2829                                                    struct dt_object *parent,
2830                                                    struct lfsck_layout_req *llr,
2831                                                    struct lu_attr *la,
2832                                                    struct lu_buf *buf)
2833 {
2834         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2835         struct dt_allocation_hint       *hint   = &info->lti_hint;
2836         struct dt_object_format         *dof    = &info->lti_dof;
2837         struct ost_id                   *oi     = &info->lti_oi;
2838         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2839         struct dt_device                *dev;
2840         struct lu_device                *d      =
2841                                 &lfsck_obj2dev(llr->llr_child)->dd_lu_dev;
2842         struct lu_object                *o;
2843         struct lu_object                *n;
2844         struct dt_object                *child  = NULL;
2845         struct thandle                  *handle = NULL;
2846         struct lov_mds_md_v1            *lmm;
2847         struct lov_ost_data_v1          *objs;
2848         const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
2849         struct lu_fid                    tfid;
2850         struct lustre_handle             lh     = { 0 };
2851         struct lu_buf                    ea_buf;
2852         __u32                            magic;
2853         __u32                            index;
2854         int                              rc;
2855         ENTRY;
2856
2857         /* We use two separated transactions to repair the inconsistency.
2858          *
2859          * 1) create the child (OST-object).
2860          * 2) update the parent LOV EA according to the child's FID.
2861          *
2862          * If 1) succeed, but 2) failed or aborted, then such OST-object will be
2863          * handled as orphan when the layout LFSCK run next time.
2864          *
2865          * If 1) failed, but 2) succeed, then such OST-object will be re-created
2866          * as dangling referened case when the layout LFSCK run next time. */
2867
2868         /* The 1st transaction. */
2869         o = lu_object_anon(env, d, NULL);
2870         if (IS_ERR(o))
2871                 GOTO(log, rc = PTR_ERR(o));
2872
2873         n = lu_object_locate(o->lo_header, d->ld_type);
2874         if (unlikely(n == NULL)) {
2875                 lu_object_put_nocache(env, o);
2876
2877                 GOTO(log, rc = -EINVAL);
2878         }
2879
2880         child = container_of(n, struct dt_object, do_lu);
2881         memset(hint, 0, sizeof(*hint));
2882         rc = dt_attr_get(env, parent, la);
2883         if (rc != 0)
2884                 GOTO(log, rc);
2885
2886         la->la_valid = LA_UID | LA_GID;
2887         memset(dof, 0, sizeof(*dof));
2888
2889         dev = lfsck_obj2dev(child);
2890         handle = dt_trans_create(env, dev);
2891         if (IS_ERR(handle))
2892                 GOTO(log, rc = PTR_ERR(handle));
2893
2894         rc = dt_declare_create(env, child, la, hint, dof, handle);
2895         if (rc != 0)
2896                 GOTO(stop, rc);
2897
2898         rc = dt_trans_start_local(env, dev, handle);
2899         if (rc != 0)
2900                 GOTO(stop, rc);
2901
2902         rc = dt_create(env, child, la, hint, dof, handle);
2903         dt_trans_stop(env, dev, handle);
2904         handle = NULL;
2905         if (rc != 0)
2906                 GOTO(log, rc);
2907
2908         rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
2909                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2910                               LCK_EX);
2911         if (rc != 0)
2912                 GOTO(log, rc);
2913
2914         /* The 2nd transaction. */
2915
2916         /* XXX: Generally, we should use bottom device (OSD) to update parent
2917          *      LOV EA. But because the LOD-object still references the wrong
2918          *      OSP-object that should be detached after the parent's LOV EA
2919          *      refreshed. Unfortunately, there is no suitable API for that.
2920          *      So we have to make the LOD to re-load the OSP-object(s) via
2921          *      replacing the LOV EA against the LOD-object.
2922          *
2923          *      Once the DNE2 patches have been landed, we can replace the
2924          *      LOD device with the OSD device. LU-6230. */
2925
2926         dev = lfsck->li_next;
2927         parent = lfsck_object_locate(dev, parent);
2928         if (IS_ERR(parent))
2929                 GOTO(log, rc = PTR_ERR(parent));
2930
2931         handle = dt_trans_create(env, dev);
2932         if (IS_ERR(handle))
2933                 GOTO(log, rc = PTR_ERR(handle));
2934
2935         rc = dt_declare_xattr_set(env, parent, buf, XATTR_NAME_LOV,
2936                                   LU_XATTR_REPLACE, handle);
2937         if (rc != 0)
2938                 GOTO(stop, rc);
2939
2940         rc = dt_trans_start_local(env, dev, handle);
2941         if (rc != 0)
2942                 GOTO(stop, rc);
2943
2944         dt_write_lock(env, parent, 0);
2945         if (unlikely(lfsck_is_dead_obj(parent)))
2946                 GOTO(unlock, rc = 0);
2947
2948         rc = dt_xattr_get(env, parent, buf, XATTR_NAME_LOV);
2949         if (unlikely(rc == 0 || rc == -ENODATA || rc == -ERANGE))
2950                 GOTO(unlock, rc = 0);
2951
2952         lmm = buf->lb_buf;
2953         /* Currently, we only support LOV_MAGIC_V1/LOV_MAGIC_V3 which has
2954          * been verified in lfsck_layout_verify_header() already. If some
2955          * new magic introduced in the future, then layout LFSCK needs to
2956          * be updated also. */
2957         magic = le32_to_cpu(lmm->lmm_magic);
2958         if (magic == LOV_MAGIC_V1) {
2959                 objs = &lmm->lmm_objects[llr->llr_lov_idx];
2960         } else {
2961                 LASSERT(magic == LOV_MAGIC_V3);
2962                 objs =
2963                 &((struct lov_mds_md_v3 *)lmm)->lmm_objects[llr->llr_lov_idx];
2964         }
2965
2966         ostid_le_to_cpu(&objs->l_ost_oi, oi);
2967         index = le32_to_cpu(objs->l_ost_idx);
2968         rc = ostid_to_fid(&tfid, oi, index);
2969         /* Someone changed layout during the LFSCK, no need to repair then. */
2970         if (rc == 0 && !lu_fid_eq(&tfid, lu_object_fid(&llr->llr_child->do_lu)))
2971                 GOTO(unlock, rc = 0);
2972
2973         lmm->lmm_layout_gen = cpu_to_le16(le16_to_cpu(lmm->lmm_layout_gen) + 1);
2974         fid_to_ostid(lu_object_fid(&child->do_lu), oi);
2975         ostid_cpu_to_le(oi, &objs->l_ost_oi);
2976         objs->l_ost_gen = cpu_to_le32(0);
2977         objs->l_ost_idx = cpu_to_le32(llr->llr_ost_idx);
2978         lfsck_buf_init(&ea_buf, lmm,
2979                        lov_mds_md_size(le16_to_cpu(lmm->lmm_stripe_count),
2980                                        magic));
2981         rc = dt_xattr_set(env, parent, &ea_buf, XATTR_NAME_LOV,
2982                           LU_XATTR_REPLACE, handle);
2983
2984         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2985
2986 unlock:
2987         dt_write_unlock(env, parent);
2988
2989 stop:
2990         if (handle != NULL)
2991                 dt_trans_stop(env, dev, handle);
2992
2993 log:
2994         lfsck_ibits_unlock(&lh, LCK_EX);
2995         if (child != NULL)
2996                 lfsck_object_put(env, child);
2997
2998         if (rc != 0)
2999                 CDEBUG(D_LFSCK, "%s: layout LFSCK assistant repaired "
3000                        "multiple references for: parent "DFID", OST-index %u, "
3001                        "stripe-index %u, owner %u/%u: rc = %d\n",
3002                        lfsck_lfsck2name(lfsck), PFID(pfid), llr->llr_ost_idx,
3003                        llr->llr_lov_idx, la->la_uid, la->la_gid, rc);
3004
3005         return rc;
3006 }
3007
3008 /* If the MDT-object and the OST-object have different owner information,
3009  * then trust the MDT-object, because the normal chown/chgrp handle order
3010  * is from MDT to OST, and it is possible that some chown/chgrp operation
3011  * is partly done. */
3012 static int lfsck_layout_repair_owner(const struct lu_env *env,
3013                                      struct lfsck_component *com,
3014                                      struct dt_object *parent,
3015                                      struct lfsck_layout_req *llr,
3016                                      struct lu_attr *pla,
3017                                      const struct lu_attr *cla)
3018 {
3019         struct lfsck_thread_info        *info   = lfsck_env_info(env);
3020         struct lu_attr                  *tla    = &info->lti_la2;
3021         struct dt_object                *child  = llr->llr_child;
3022         struct dt_device                *dev    = lfsck_obj2dev(child);
3023         struct thandle                  *handle;
3024         int                              rc;
3025         ENTRY;
3026
3027         tla->la_uid = pla->la_uid;
3028         tla->la_gid = pla->la_gid;
3029         tla->la_valid = LA_UID | LA_GID;
3030         handle = dt_trans_create(env, dev);
3031         if (IS_ERR(handle))
3032                 GOTO(log, rc = PTR_ERR(handle));
3033
3034         rc = dt_declare_attr_set(env, child, tla, handle);
3035         if (rc != 0)
3036                 GOTO(stop, rc);
3037
3038         rc = dt_trans_start_local(env, dev, handle);
3039         if (rc != 0)
3040                 GOTO(stop, rc);
3041
3042         /* Use the dt_object lock to serialize with destroy and attr_set. */
3043         dt_read_lock(env, parent, 0);
3044         if (unlikely(lfsck_is_dead_obj(parent)))
3045                 GOTO(unlock, rc = 1);
3046
3047         /* Get the latest parent's owner. */
3048         rc = dt_attr_get(env, parent, pla);
3049         if (rc != 0)
3050                 GOTO(unlock, rc);
3051
3052         /* Some others chown/chgrp during the LFSCK, needs to do nothing. */
3053         if (unlikely(tla->la_uid != pla->la_uid ||
3054                      tla->la_gid != pla->la_gid))
3055                 rc = 1;
3056         else
3057                 rc = dt_attr_set(env, child, tla, handle);
3058
3059         GOTO(unlock, rc);
3060
3061 unlock:
3062         dt_read_unlock(env, parent);
3063
3064 stop:
3065         rc = lfsck_layout_trans_stop(env, dev, handle, rc);
3066
3067 log:
3068         if (rc != 0)
3069                 CDEBUG(D_LFSCK, "%s: layout LFSCK assistant repaired "
3070                        "inconsistent file owner for: parent "DFID", child "DFID
3071                        ", OST-index %u, stripe-index %u, old owner %u/%u, "
3072                        "new owner %u/%u: rc = %d\n",
3073                        lfsck_lfsck2name(com->lc_lfsck),
3074                        PFID(lfsck_dto2fid(parent)), PFID(lfsck_dto2fid(child)),
3075                        llr->llr_ost_idx, llr->llr_lov_idx,
3076                        cla->la_uid, cla->la_gid, tla->la_uid, tla->la_gid, rc);
3077
3078         return rc;
3079 }
3080
3081 /* Check whether the OST-object correctly back points to the
3082  * MDT-object (@parent) via the XATTR_NAME_FID xattr (@pfid). */
3083 static int lfsck_layout_check_parent(const struct lu_env *env,
3084                                      struct lfsck_component *com,
3085                                      struct lfsck_assistant_object *lso,
3086                                      const struct lu_fid *pfid,
3087                                      const struct lu_fid *cfid,
3088                                      const struct lu_attr *cla,
3089                                      struct lfsck_layout_req *llr,
3090                                      struct lu_buf *lov_ea, __u32 idx)
3091 {
3092         struct lfsck_thread_info        *info   = lfsck_env_info(env);
3093         struct lu_buf                   *buf    = &info->lti_big_buf;
3094         struct dt_object                *tobj;
3095         struct lov_mds_md_v1            *lmm;
3096         struct lov_ost_data_v1          *objs;
3097         struct lustre_handle             lh     = { 0 };
3098         int                              rc;
3099         int                              i;
3100         __u32                            magic;
3101         __u16                            count;
3102         ENTRY;
3103
3104         if (unlikely(!fid_is_sane(pfid)))
3105                 RETURN(LLIT_UNMATCHED_PAIR);
3106
3107         if (lu_fid_eq(pfid, &lso->lso_fid)) {
3108                 if (likely(llr->llr_lov_idx == idx))
3109                         RETURN(0);
3110
3111                 RETURN(LLIT_UNMATCHED_PAIR);
3112         }
3113
3114         tobj = lfsck_object_find_bottom(env, com->lc_lfsck, pfid);
3115         if (IS_ERR(tobj))
3116                 RETURN(PTR_ERR(tobj));
3117
3118         if (dt_object_exists(tobj) == 0 || lfsck_is_dead_obj(tobj) ||
3119             !S_ISREG(lfsck_object_type(tobj)))
3120                 GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3121
3122         /* Load the tobj's layout EA, in spite of it is a local MDT-object or
3123          * remote one on another MDT. Then check whether the given OST-object
3124          * is in such layout. If yes, it is multiple referenced, otherwise it
3125          * is unmatched referenced case. */
3126         rc = lfsck_layout_get_lovea(env, tobj, buf);
3127         if (rc == 0 || rc == -ENOENT)
3128                 GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3129
3130         if (rc < 0)
3131                 GOTO(out, rc);
3132
3133         lmm = buf->lb_buf;
3134         magic = le32_to_cpu(lmm->lmm_magic);
3135         if (magic == LOV_MAGIC_V1) {
3136                 objs = &lmm->lmm_objects[0];
3137         } else {
3138                 LASSERT(magic == LOV_MAGIC_V3);
3139                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
3140         }
3141
3142         count = le16_to_cpu(lmm->lmm_stripe_count);
3143         for (i = 0; i < count; i++, objs++) {
3144                 struct lu_fid           *tfid   = &info->lti_fid2;
3145                 struct ost_id           *oi     = &info->lti_oi;
3146                 __u32                    idx2;
3147
3148                 if (lovea_slot_is_dummy(objs))
3149                         continue;
3150
3151                 ostid_le_to_cpu(&objs->l_ost_oi, oi);
3152                 idx2 = le32_to_cpu(objs->l_ost_idx);
3153                 rc = ostid_to_fid(tfid, oi, idx2);
3154                 if (rc != 0) {
3155                         CDEBUG(D_LFSCK, "%s: the parent "DFID" contains "
3156                                "invalid layout EA at the slot %d, index %u\n",
3157                                lfsck_lfsck2name(com->lc_lfsck),
3158                                PFID(pfid), i, idx2);
3159
3160                         GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3161                 }
3162
3163                 if (lu_fid_eq(cfid, tfid)) {
3164                         rc = lfsck_ibits_lock(env, com->lc_lfsck, tobj, &lh,
3165                                               MDS_INODELOCK_UPDATE |
3166                                               MDS_INODELOCK_LAYOUT |
3167                                               MDS_INODELOCK_XATTR,
3168                                               LCK_EX);
3169                         if (rc != 0)
3170                                 GOTO(out, rc);
3171
3172                         dt_read_lock(env, tobj, 0);
3173
3174                         /* For local MDT-object, re-check existence
3175                          * after taken the lock. */
3176                         if (!dt_object_remote(tobj)) {
3177                                 if (dt_object_exists(tobj) == 0 ||
3178                                     lfsck_is_dead_obj(tobj)) {
3179                                         rc = LLIT_UNMATCHED_PAIR;
3180                                 } else {
3181                                         *lov_ea = *buf;
3182                                         rc = LLIT_MULTIPLE_REFERENCED;
3183                                 }
3184
3185                                 GOTO(unlock, rc);
3186                         }
3187
3188                         /* For migration case, the new MDT-object and old
3189                          * MDT-object may reference the same OST-object at
3190                          * some migration internal time.
3191                          *
3192                          * For remote MDT-object, the local MDT may not know
3193                          * whether it has been removed or not.  Try checking
3194                          * for a non-existent xattr to check if this object
3195                          * has been been removed or not. */
3196                         rc = dt_xattr_get(env, tobj, &LU_BUF_NULL,
3197                                           XATTR_NAME_DUMMY);
3198                         if (unlikely(rc == -ENOENT || rc >= 0)) {
3199                                 rc = LLIT_UNMATCHED_PAIR;
3200                         } else if (rc == -ENODATA) {
3201                                 *lov_ea = *buf;
3202                                 rc = LLIT_MULTIPLE_REFERENCED;
3203                         }
3204
3205                         GOTO(unlock, rc);
3206                 }
3207         }
3208
3209         GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3210
3211 unlock:
3212         if (lustre_handle_is_used(&lh)) {
3213                 dt_read_unlock(env, tobj);
3214                 lfsck_ibits_unlock(&lh, LCK_EX);
3215         }
3216
3217 out:
3218         lfsck_object_put(env, tobj);
3219
3220         return rc;
3221 }
3222
3223 static int lfsck_layout_assistant_handler_p1(const struct lu_env *env,
3224                                              struct lfsck_component *com,
3225                                              struct lfsck_assistant_req *lar)
3226 {
3227         struct lfsck_layout_req              *llr    =
3228                         container_of0(lar, struct lfsck_layout_req, llr_lar);
3229         struct lfsck_assistant_object        *lso    = lar->lar_parent;
3230         struct lfsck_layout                  *lo     = com->lc_file_ram;
3231         struct lfsck_thread_info             *info   = lfsck_env_info(env);
3232         struct filter_fid_old                *pea    = &info->lti_old_pfid;
3233         struct lu_fid                        *pfid   = &info->lti_fid;
3234         struct lu_buf                         buf    = { NULL };
3235         struct dt_object                     *parent = NULL;
3236         struct dt_object                     *child  = llr->llr_child;
3237         struct lu_attr                       *pla    = &lso->lso_attr;
3238         struct lu_attr                       *cla    = &info->lti_la;
3239         struct lfsck_instance                *lfsck  = com->lc_lfsck;
3240         struct lfsck_bookmark                *bk     = &lfsck->li_bookmark_ram;
3241         enum lfsck_layout_inconsistency_type  type   = LLIT_NONE;
3242         __u32                                 idx    = 0;
3243         int                                   rc;
3244         ENTRY;
3245
3246         if (lso->lso_dead)
3247                 RETURN(0);
3248
3249         rc = dt_attr_get(env, child, cla);
3250         if (rc == -ENOENT) {
3251                 parent = lfsck_assistant_object_load(env, lfsck, lso);
3252                 if (IS_ERR(parent)) {
3253                         rc = PTR_ERR(parent);
3254
3255                         RETURN(rc == -ENOENT ? 0 : rc);
3256                 }
3257
3258                 type = LLIT_DANGLING;
3259                 goto repair;
3260         }
3261
3262         if (rc != 0)
3263                 GOTO(out, rc);
3264
3265         lfsck_buf_init(&buf, pea, sizeof(struct filter_fid_old));
3266         rc = dt_xattr_get(env, child, &buf, XATTR_NAME_FID);
3267         if (unlikely(rc > 0 && rc != sizeof(struct filter_fid_old) &&
3268                      rc != sizeof(struct filter_fid))) {
3269                 type = LLIT_UNMATCHED_PAIR;
3270                 goto repair;
3271         }
3272
3273         if (rc < 0 && rc != -ENODATA)
3274                 GOTO(out, rc);
3275
3276         if (rc == 0 || rc == -ENODATA)
3277                 GOTO(check_owner, rc = 0);
3278
3279         fid_le_to_cpu(pfid, &pea->ff_parent);
3280         /* Currently, the filter_fid::ff_parent::f_ver is not the
3281          * real parent MDT-object's FID::f_ver, instead it is the
3282          * OST-object index in its parent MDT-object's layout EA. */
3283         idx = pfid->f_stripe_idx;
3284         pfid->f_ver = 0;
3285         rc = lfsck_layout_check_parent(env, com, lso, pfid,
3286                                        lu_object_fid(&child->do_lu),
3287                                        cla, llr, &buf, idx);
3288         if (rc > 0) {
3289                 type = rc;
3290                 goto repair;
3291         }
3292
3293         if (rc < 0)
3294                 GOTO(out, rc);
3295
3296 check_owner:
3297         /* Someone may has changed the owner after the parent attr pre-loaded.
3298          * It can be handled later inside the lfsck_layout_repair_owner(). */
3299         if (unlikely(cla->la_uid != pla->la_uid ||
3300                      cla->la_gid != pla->la_gid)) {
3301                 type = LLIT_INCONSISTENT_OWNER;
3302                 goto repair;
3303         }
3304
3305 repair:
3306         if (type == LLIT_NONE)
3307                 GOTO(out, rc = 0);
3308
3309         if (bk->lb_param & LPF_DRYRUN)
3310                 GOTO(out, rc = 1);
3311
3312         if (parent == NULL) {
3313                 parent = lfsck_assistant_object_load(env, lfsck, lso);
3314                 if (IS_ERR(parent)) {
3315                         rc = PTR_ERR(parent);
3316
3317                         if (rc == -ENOENT)
3318                                 RETURN(0);
3319
3320                         GOTO(out, rc);
3321                 }
3322         }
3323
3324         switch (type) {
3325         case LLIT_DANGLING:
3326                 rc = lfsck_layout_repair_dangling(env, com, parent, llr, pla);
3327                 break;
3328         case LLIT_UNMATCHED_PAIR:
3329                 rc = lfsck_layout_repair_unmatched_pair(env, com, parent,
3330                                                         llr, pla);
3331                 break;
3332         case LLIT_MULTIPLE_REFERENCED:
3333                 rc = lfsck_layout_repair_multiple_references(env, com, parent,
3334                                                              llr, pla, &buf);
3335                 break;
3336         case LLIT_INCONSISTENT_OWNER:
3337                 rc = lfsck_layout_repair_owner(env, com, parent, llr, pla, cla);
3338                 break;
3339         default:
3340                 rc = 0;
3341                 break;
3342         }
3343
3344         GOTO(out, rc);
3345
3346 out:
3347         down_write(&com->lc_sem);
3348         if (rc < 0) {
3349                 struct lfsck_assistant_data *lad = com->lc_data;
3350
3351                 if (unlikely(lad->lad_exit)) {
3352                         rc = 0;
3353                 } else if (rc == -ENOTCONN || rc == -ESHUTDOWN ||
3354                            rc == -ETIMEDOUT || rc == -EHOSTDOWN ||
3355                            rc == -EHOSTUNREACH) {
3356                         /* If cannot touch the target server,
3357                          * mark the LFSCK as INCOMPLETE. */
3358                         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant fail to "
3359                                "talk with OST %x: rc = %d\n",
3360                                lfsck_lfsck2name(lfsck), llr->llr_ost_idx, rc);
3361                         lfsck_lad_set_bitmap(env, com, llr->llr_ost_idx);
3362                         lo->ll_objs_skipped++;
3363                         rc = 0;
3364                 } else {
3365                         lfsck_layout_record_failure(env, lfsck, lo);
3366                 }
3367         } else if (rc > 0) {
3368                 LASSERTF(type > LLIT_NONE && type <= LLIT_MAX,
3369                          "unknown type = %d\n", type);
3370
3371                 lo->ll_objs_repaired[type - 1]++;
3372                 if (bk->lb_param & LPF_DRYRUN &&
3373                     unlikely(lo->ll_pos_first_inconsistent == 0))
3374                         lo->ll_pos_first_inconsistent =
3375                         lfsck->li_obj_oit->do_index_ops->dio_it.store(env,
3376                                                         lfsck->li_di_oit);
3377         }
3378         up_write(&com->lc_sem);
3379
3380         if (parent != NULL && !IS_ERR(parent))
3381                 lfsck_object_put(env, parent);
3382
3383         return rc;
3384 }
3385
3386 static int lfsck_layout_assistant_handler_p2(const struct lu_env *env,
3387                                              struct lfsck_component *com)
3388 {
3389         struct lfsck_assistant_data     *lad    = com->lc_data;
3390         struct lfsck_instance           *lfsck  = com->lc_lfsck;
3391         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
3392         struct lfsck_tgt_descs          *ltds   = &lfsck->li_ost_descs;
3393         struct lfsck_tgt_desc           *ltd;
3394         int                              rc     = 0;
3395         ENTRY;
3396
3397         CDEBUG(D_LFSCK, "%s: layout LFSCK phase2 scan start\n",
3398                lfsck_lfsck2name(lfsck));
3399
3400         spin_lock(&ltds->ltd_lock);
3401         while (!list_empty(&lad->lad_ost_phase2_list)) {
3402                 ltd = list_entry(lad->lad_ost_phase2_list.next,
3403                                  struct lfsck_tgt_desc,
3404                                  ltd_layout_phase_list);
3405                 list_del_init(&ltd->ltd_layout_phase_list);
3406                 if (bk->lb_param & LPF_ALL_TGT) {
3407                         spin_unlock(&ltds->ltd_lock);
3408                         rc = lfsck_layout_scan_orphan(env, com, ltd);
3409                         if (rc != 0 && bk->lb_param & LPF_FAILOUT)
3410                                 RETURN(rc);
3411
3412                         if (unlikely(lad->lad_exit ||
3413                                      !thread_is_running(&lfsck->li_thread)))
3414                                 RETURN(0);
3415                         spin_lock(&ltds->ltd_lock);
3416                 }
3417         }
3418
3419         if (list_empty(&lad->lad_ost_phase1_list))
3420                 rc = 1;
3421         else
3422                 rc = 0;
3423         spin_unlock(&ltds->ltd_lock);
3424
3425         CDEBUG(D_LFSCK, "%s: layout LFSCK phase2 scan stop: rc = %d\n",
3426                lfsck_lfsck2name(lfsck), rc);
3427
3428         RETURN(rc);
3429 }
3430
3431 static int
3432 lfsck_layout_slave_async_interpret(const struct lu_env *env,
3433                                    struct ptlrpc_request *req,
3434                                    void *args, int rc)
3435 {
3436         struct lfsck_layout_slave_async_args *llsaa = args;
3437         struct obd_export                    *exp   = llsaa->llsaa_exp;
3438         struct lfsck_component               *com   = llsaa->llsaa_com;
3439         struct lfsck_layout_slave_target     *llst  = llsaa->llsaa_llst;
3440         struct lfsck_layout_slave_data       *llsd  = com->lc_data;
3441         struct lfsck_reply                   *lr    = NULL;
3442         bool                                  done  = false;
3443
3444         if (rc != 0) {
3445                 /* It is quite probably caused by target crash,
3446                  * to make the LFSCK can go ahead, assume that
3447                  * the target finished the LFSCK prcoessing. */
3448                 done = true;
3449         } else {
3450                 lr = req_capsule_server_get(&req->rq_pill, &RMF_LFSCK_REPLY);
3451                 if (lr->lr_status != LS_SCANNING_PHASE1 &&
3452                     lr->lr_status != LS_SCANNING_PHASE2)
3453                         done = true;
3454         }
3455
3456         if (done) {
3457                 CDEBUG(D_LFSCK, "%s: layout LFSCK slave gets the MDT %x "
3458                        "status %d\n", lfsck_lfsck2name(com->lc_lfsck),
3459                        llst->llst_index, lr != NULL ? lr->lr_status : rc);
3460
3461                 lfsck_layout_llst_del(llsd, llst);
3462         }
3463
3464         lfsck_layout_llst_put(llst);
3465         lfsck_component_put(env, com);
3466         class_export_put(exp);
3467
3468         return 0;
3469 }
3470
3471 static int lfsck_layout_async_query(const struct lu_env *env,
3472                                     struct lfsck_component *com,
3473                                     struct obd_export *exp,
3474                                     struct lfsck_layout_slave_target *llst,
3475                                     struct lfsck_request *lr,
3476                                     struct ptlrpc_request_set *set)
3477 {
3478         struct lfsck_layout_slave_async_args *llsaa;
3479         struct ptlrpc_request                *req;
3480         struct lfsck_request                 *tmp;
3481         int                                   rc;
3482         ENTRY;
3483
3484         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LFSCK_QUERY);
3485         if (req == NULL)
3486                 RETURN(-ENOMEM);
3487
3488         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_QUERY);
3489         if (rc != 0) {
3490                 ptlrpc_request_free(req);
3491                 RETURN(rc);
3492         }
3493
3494         tmp = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
3495         *tmp = *lr;
3496         ptlrpc_request_set_replen(req);
3497
3498         llsaa = ptlrpc_req_async_args(req);
3499         llsaa->llsaa_exp = exp;
3500         llsaa->llsaa_com = lfsck_component_get(com);
3501         llsaa->llsaa_llst = llst;
3502         req->rq_interpret_reply = lfsck_layout_slave_async_interpret;
3503         ptlrpc_set_add_req(set, req);
3504
3505         RETURN(0);
3506 }
3507
3508 static int lfsck_layout_async_notify(const struct lu_env *env,
3509                                      struct obd_export *exp,
3510                                      struct lfsck_request *lr,
3511                                      struct ptlrpc_request_set *set)
3512 {
3513         struct ptlrpc_request   *req;
3514         struct lfsck_request    *tmp;
3515         int                      rc;
3516         ENTRY;
3517
3518         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LFSCK_NOTIFY);
3519         if (req == NULL)
3520                 RETURN(-ENOMEM);
3521
3522         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_NOTIFY);
3523         if (rc != 0) {
3524                 ptlrpc_request_free(req);
3525                 RETURN(rc);
3526         }
3527
3528         tmp = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
3529         *tmp = *lr;
3530         ptlrpc_request_set_replen(req);
3531         ptlrpc_set_add_req(set, req);
3532
3533         RETURN(0);
3534 }
3535
3536 static int
3537 lfsck_layout_slave_query_master(const struct lu_env *env,
3538                                 struct lfsck_component *com)
3539 {
3540         struct lfsck_request             *lr    = &lfsck_env_info(env)->lti_lr;
3541         struct lfsck_instance            *lfsck = com->lc_lfsck;
3542         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
3543         struct lfsck_layout_slave_target *llst;
3544         struct obd_export                *exp;
3545         struct ptlrpc_request_set        *set;
3546         int                               rc    = 0;
3547         int                               rc1   = 0;
3548         ENTRY;
3549
3550         set = ptlrpc_prep_set();
3551         if (set == NULL)
3552                 GOTO(log, rc = -ENOMEM);
3553
3554         memset(lr, 0, sizeof(*lr));
3555         lr->lr_event = LE_QUERY;
3556         lr->lr_active = LFSCK_TYPE_LAYOUT;
3557
3558         llsd->llsd_touch_gen++;
3559         spin_lock(&llsd->llsd_lock);
3560         while (!list_empty(&llsd->llsd_master_list)) {
3561                 llst = list_entry(llsd->llsd_master_list.next,
3562                                   struct lfsck_layout_slave_target,
3563                                   llst_list);
3564                 if (llst->llst_gen == llsd->llsd_touch_gen)
3565                         break;
3566
3567                 llst->llst_gen = llsd->llsd_touch_gen;
3568                 list_move_tail(&llst->llst_list,
3569                                &llsd->llsd_master_list);
3570                 atomic_inc(&llst->llst_ref);
3571                 spin_unlock(&llsd->llsd_lock);
3572
3573                 exp = lustre_find_lwp_by_index(lfsck->li_obd->obd_name,
3574                                                llst->llst_index);
3575                 if (exp == NULL) {
3576                         lfsck_layout_llst_del(llsd, llst);