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_object {
  92         struct lu_attr           llo_attr;
  93         atomic_t                 llo_ref;
  94         __u64                    llo_cookie;
  95         __u16                    llo_gen;
  96 };
  97
  98 struct lfsck_layout_req {
  99         struct lfsck_assistant_req       llr_lar;
 100         struct lfsck_layout_object      *llr_parent;
 101         struct dt_object                *llr_child;
 102         __u32                            llr_ost_idx;
 103         __u32                            llr_lov_idx; /* offset in LOV EA */
 104 };
 105
 106 struct lfsck_layout_slave_async_args {
 107         struct obd_export                *llsaa_exp;
 108         struct lfsck_component           *llsaa_com;
 109         struct lfsck_layout_slave_target *llsaa_llst;
 110 };
 111
 112 static struct lfsck_layout_object *
 113 lfsck_layout_object_init(const struct lu_env *env, struct dt_object *obj,
 114                          __u64 cookie, __u16 gen)
 115 {
 116         struct lfsck_layout_object *llo;
 117         int                         rc;
 118
 119         OBD_ALLOC_PTR(llo);
 120         if (llo == NULL)
 121                 return ERR_PTR(-ENOMEM);
 122
 123         rc = dt_attr_get(env, obj, &llo->llo_attr, BYPASS_CAPA);
 124         if (rc != 0) {
 125                 OBD_FREE_PTR(llo);
 126
 127                 return ERR_PTR(rc);
 128         }
 129
 130         llo->llo_cookie = cookie;
 131         /* The gen can be used to check whether some others have changed the
 132          * file layout after LFSCK pre-fetching but before real verification. */
 133         llo->llo_gen = gen;
 134         atomic_set(&llo->llo_ref, 1);
 135
 136         return llo;
 137 }
 138
 139 static inline void
 140 lfsck_layout_llst_put(struct lfsck_layout_slave_target *llst)
 141 {
 142         if (atomic_dec_and_test(&llst->llst_ref)) {
 143                 LASSERT(list_empty(&llst->llst_list));
 144
 145                 OBD_FREE_PTR(llst);
 146         }
 147 }
 148
 149 static inline int
 150 lfsck_layout_llst_add(struct lfsck_layout_slave_data *llsd, __u32 index)
 151 {
 152         struct lfsck_layout_slave_target *llst;
 153         struct lfsck_layout_slave_target *tmp;
 154         int                               rc   = 0;
 155
 156         OBD_ALLOC_PTR(llst);
 157         if (llst == NULL)
 158                 return -ENOMEM;
 159
 160         INIT_LIST_HEAD(&llst->llst_list);
 161         llst->llst_gen = 0;
 162         llst->llst_index = index;
 163         atomic_set(&llst->llst_ref, 1);
 164
 165         spin_lock(&llsd->llsd_lock);
 166         list_for_each_entry(tmp, &llsd->llsd_master_list, llst_list) {
 167                 if (tmp->llst_index == index) {
 168                         rc = -EALREADY;
 169                         break;
 170                 }
 171         }
 172         if (rc == 0)
 173                 list_add_tail(&llst->llst_list, &llsd->llsd_master_list);
 174         spin_unlock(&llsd->llsd_lock);
 175
 176         if (rc != 0)
 177                 OBD_FREE_PTR(llst);
 178
 179         return rc;
 180 }
 181
 182 static inline void
 183 lfsck_layout_llst_del(struct lfsck_layout_slave_data *llsd,
 184                       struct lfsck_layout_slave_target *llst)
 185 {
 186         bool del = false;
 187
 188         spin_lock(&llsd->llsd_lock);
 189         if (!list_empty(&llst->llst_list)) {
 190                 list_del_init(&llst->llst_list);
 191                 del = true;
 192         }
 193         spin_unlock(&llsd->llsd_lock);
 194
 195         if (del)
 196                 lfsck_layout_llst_put(llst);
 197 }
 198
 199 static inline struct lfsck_layout_slave_target *
 200 lfsck_layout_llst_find_and_del(struct lfsck_layout_slave_data *llsd,
 201                                __u32 index, bool unlink)
 202 {
 203         struct lfsck_layout_slave_target *llst;
 204
 205         spin_lock(&llsd->llsd_lock);
 206         list_for_each_entry(llst, &llsd->llsd_master_list, llst_list) {
 207                 if (llst->llst_index == index) {
 208                         if (unlink)
 209                                 list_del_init(&llst->llst_list);
 210                         else
 211                                 atomic_inc(&llst->llst_ref);
 212                         spin_unlock(&llsd->llsd_lock);
 213
 214                         return llst;
 215                 }
 216         }
 217         spin_unlock(&llsd->llsd_lock);
 218
 219         return NULL;
 220 }
 221
 222 static inline void lfsck_layout_object_put(const struct lu_env *env,
 223                                            struct lfsck_layout_object *llo)
 224 {
 225         if (atomic_dec_and_test(&llo->llo_ref))
 226                 OBD_FREE_PTR(llo);
 227 }
 228
 229 static struct lfsck_layout_req *
 230 lfsck_layout_assistant_req_init(struct lfsck_layout_object *parent,
 231                                 const struct lu_fid *pfid,
 232                                 struct dt_object *child, __u32 ost_idx,
 233                                 __u32 lov_idx)
 234 {
 235         struct lfsck_layout_req *llr;
 236
 237         OBD_ALLOC_PTR(llr);
 238         if (llr == NULL)
 239                 return ERR_PTR(-ENOMEM);
 240
 241         INIT_LIST_HEAD(&llr->llr_lar.lar_list);
 242         llr->llr_lar.lar_fid = *pfid;
 243
 244         atomic_inc(&parent->llo_ref);
 245         llr->llr_parent = parent;
 246         llr->llr_child = child;
 247         llr->llr_ost_idx = ost_idx;
 248         llr->llr_lov_idx = lov_idx;
 249
 250         return llr;
 251 }
 252
 253 static void lfsck_layout_assistant_req_fini(const struct lu_env *env,
 254                                             struct lfsck_assistant_req *lar)
 255 {
 256         struct lfsck_layout_req *llr =
 257                         container_of0(lar, struct lfsck_layout_req, llr_lar);
 258
 259         lu_object_put(env, &llr->llr_child->do_lu);
 260         lfsck_layout_object_put(env, llr->llr_parent);
 261         OBD_FREE_PTR(llr);
 262 }
 263
 264 static int
 265 lfsck_layout_assistant_sync_failures_interpret(const struct lu_env *env,
 266                                                struct ptlrpc_request *req,
 267                                                void *args, int rc)
 268 {
 269         if (rc == 0) {
 270                 struct lfsck_async_interpret_args *laia = args;
 271                 struct lfsck_tgt_desc             *ltd  = laia->laia_ltd;
 272
 273                 ltd->ltd_synced_failures = 1;
 274                 atomic_dec(laia->laia_count);
 275         }
 276
 277         return 0;
 278 }
 279
 280 /**
 281  * Notify remote LFSCK instances about former failures.
 282  *
 283  * The local LFSCK instance has recorded which OSTs have ever failed to respond
 284  * some LFSCK verification requests (maybe because of network issues or the OST
 285  * itself trouble). During the respond gap, the OST may missed some OST-objects
 286  * verification, then the OST cannot know whether related OST-objects have been
 287  * referenced by related MDT-objects or not, then in the second-stage scanning,
 288  * these OST-objects will be regarded as orphan, if the OST-object contains bad
 289  * parent FID for back reference, then it will misguide the LFSCK to make wrong
 290  * fixing for the fake orphan.
 291  *
 292  * To avoid above trouble, when layout LFSCK finishes the first-stage scanning,
 293  * it will scan the bitmap for the ever failed OSTs, and notify them that they
 294  * have ever missed some OST-object verification and should skip the handling
 295  * for orphan OST-objects on all MDTs that are in the layout LFSCK.
 296  *
 297  * \param[in] env       pointer to the thread context
 298  * \param[in] com       pointer to the lfsck component
 299  * \param[in] lr        pointer to the lfsck request
 300  */
 301 static void lfsck_layout_assistant_sync_failures(const struct lu_env *env,
 302                                                  struct lfsck_component *com,
 303                                                  struct lfsck_request *lr)
 304 {
 305         struct lfsck_async_interpret_args *laia  =
 306                                 &lfsck_env_info(env)->lti_laia2;
 307         struct lfsck_assistant_data       *lad   = com->lc_data;
 308         struct lfsck_layout               *lo    = com->lc_file_ram;
 309         struct lfsck_instance             *lfsck = com->lc_lfsck;
 310         struct lfsck_tgt_descs            *ltds  = &lfsck->li_ost_descs;
 311         struct lfsck_tgt_desc             *ltd;
 312         struct ptlrpc_request_set         *set;
 313         atomic_t                           count;
 314         __u32                              idx;
 315         int                                rc    = 0;
 316         ENTRY;
 317
 318         if (!lad->lad_incomplete || lo->ll_flags & LF_INCOMPLETE)
 319                 RETURN_EXIT;
 320
 321         /* If the MDT has ever failed to verfiy some OST-objects,
 322          * then sync failures with them firstly. */
 323         lr->lr_flags2 = lo->ll_flags | LF_INCOMPLETE;
 324
 325         atomic_set(&count, 0);
 326         memset(laia, 0, sizeof(*laia));
 327         laia->laia_count = &count;
 328         set = ptlrpc_prep_set();
 329         if (set == NULL)
 330                 GOTO(out, rc = -ENOMEM);
 331
 332         down_read(&ltds->ltd_rw_sem);
 333         cfs_foreach_bit(lad->lad_bitmap, idx) {
 334                 ltd = LTD_TGT(ltds, idx);
 335                 LASSERT(ltd != NULL);
 336
 337                 laia->laia_ltd = ltd;
 338                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
 339                                 lfsck_layout_assistant_sync_failures_interpret,
 340                                 laia, LFSCK_NOTIFY);
 341                 if (rc != 0) {
 342                         CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
 343                                "notify target %x for %s phase1 done: "
 344                                "rc = %d\n", lfsck_lfsck2name(com->lc_lfsck),
 345                                ltd->ltd_index, lad->lad_name, rc);
 346
 347                         break;
 348                 }
 349
 350                 atomic_inc(&count);
 351         }
 352         up_read(&ltds->ltd_rw_sem);
 353
 354         if (rc == 0 && atomic_read(&count) > 0)
 355                 rc = ptlrpc_set_wait(set);
 356
 357         ptlrpc_set_destroy(set);
 358
 359         if (rc == 0 && atomic_read(&count) > 0)
 360                 rc = -EINVAL;
 361
 362         GOTO(out, rc);
 363
 364 out:
 365         if (rc != 0)
 366                 /* If failed to sync failures with the OSTs, then have to
 367                  * mark the whole LFSCK as LF_INCOMPLETE to skip the whole
 368                  * subsequent orphan OST-object handling. */
 369                 lo->ll_flags |= LF_INCOMPLETE;
 370
 371         lr->lr_flags2 = lo->ll_flags;
 372 }
 373
 374 static int lfsck_layout_get_lovea(const struct lu_env *env,
 375                                   struct dt_object *obj, struct lu_buf *buf)
 376 {
 377         int rc;
 378
 379 again:
 380         rc = dt_xattr_get(env, obj, buf, XATTR_NAME_LOV, BYPASS_CAPA);
 381         if (rc == -ERANGE) {
 382                 rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LOV,
 383                                   BYPASS_CAPA);
 384                 if (rc <= 0)
 385                         return rc;
 386
 387                 lu_buf_realloc(buf, rc);
 388                 if (buf->lb_buf == NULL)
 389                         return -ENOMEM;
 390
 391                 goto again;
 392         }
 393
 394         if (rc == -ENODATA)
 395                 rc = 0;
 396
 397         if (rc <= 0)
 398                 return rc;
 399
 400         if (unlikely(buf->lb_buf == NULL)) {
 401                 lu_buf_alloc(buf, rc);
 402                 if (buf->lb_buf == NULL)
 403                         return -ENOMEM;
 404
 405                 goto again;
 406         }
 407
 408         return rc;
 409 }
 410
 411 static int lfsck_layout_verify_header(struct lov_mds_md_v1 *lmm)
 412 {
 413         __u32 magic;
 414         __u32 pattern;
 415
 416         magic = le32_to_cpu(lmm->lmm_magic);
 417         /* If magic crashed, keep it there. Sometime later, during OST-object
 418          * orphan handling, if some OST-object(s) back-point to it, it can be
 419          * verified and repaired. */
 420         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3) {
 421                 struct ost_id   oi;
 422                 int             rc;
 423
 424                 lmm_oi_le_to_cpu(&oi, &lmm->lmm_oi);
 425                 if ((magic & LOV_MAGIC_MASK) == LOV_MAGIC_MAGIC)
 426                         rc = -EOPNOTSUPP;
 427                 else
 428                         rc = -EINVAL;
 429
 430                 CDEBUG(D_LFSCK, "%s LOV EA magic %u on "DOSTID"\n",
 431                        rc == -EINVAL ? "Unknown" : "Unsupported",
 432                        magic, POSTID(&oi));
 433
 434                 return rc;
 435         }
 436
 437         pattern = le32_to_cpu(lmm->lmm_pattern);
 438         /* XXX: currently, we only support LOV_PATTERN_RAID0. */
 439         if (lov_pattern(pattern) != LOV_PATTERN_RAID0) {
 440                 struct ost_id oi;
 441
 442                 lmm_oi_le_to_cpu(&oi, &lmm->lmm_oi);
 443                 CDEBUG(D_LFSCK, "Unsupported LOV EA pattern %u on "DOSTID"\n",
 444                        pattern, POSTID(&oi));
 445
 446                 return -EOPNOTSUPP;
 447         }
 448
 449         return 0;
 450 }
 451
 452 #define LFSCK_RBTREE_BITMAP_SIZE        PAGE_CACHE_SIZE
 453 #define LFSCK_RBTREE_BITMAP_WIDTH       (LFSCK_RBTREE_BITMAP_SIZE << 3)
 454 #define LFSCK_RBTREE_BITMAP_MASK        (LFSCK_RBTREE_BITMAP_WIDTH - 1)
 455
 456 struct lfsck_rbtree_node {
 457         struct rb_node   lrn_node;
 458         __u64            lrn_seq;
 459         __u32            lrn_first_oid;
 460         atomic_t         lrn_known_count;
 461         atomic_t         lrn_accessed_count;
 462         void            *lrn_known_bitmap;
 463         void            *lrn_accessed_bitmap;
 464 };
 465
 466 static inline int lfsck_rbtree_cmp(struct lfsck_rbtree_node *lrn,
 467                                    __u64 seq, __u32 oid)
 468 {
 469         if (seq < lrn->lrn_seq)
 470                 return -1;
 471
 472         if (seq > lrn->lrn_seq)
 473                 return 1;
 474
 475         if (oid < lrn->lrn_first_oid)
 476                 return -1;
 477
 478         if (oid - lrn->lrn_first_oid >= LFSCK_RBTREE_BITMAP_WIDTH)
 479                 return 1;
 480
 481         return 0;
 482 }
 483
 484 /* The caller should hold llsd->llsd_rb_lock. */
 485 static struct lfsck_rbtree_node *
 486 lfsck_rbtree_search(struct lfsck_layout_slave_data *llsd,
 487                     const struct lu_fid *fid, bool *exact)
 488 {
 489         struct rb_node           *node  = llsd->llsd_rb_root.rb_node;
 490         struct rb_node           *prev  = NULL;
 491         struct lfsck_rbtree_node *lrn   = NULL;
 492         int                       rc    = 0;
 493
 494         if (exact != NULL)
 495                 *exact = true;
 496
 497         while (node != NULL) {
 498                 prev = node;
 499                 lrn = rb_entry(node, struct lfsck_rbtree_node, lrn_node);
 500                 rc = lfsck_rbtree_cmp(lrn, fid_seq(fid), fid_oid(fid));
 501                 if (rc < 0)
 502                         node = node->rb_left;
 503                 else if (rc > 0)
 504                         node = node->rb_right;
 505                 else
 506                         return lrn;
 507         }
 508
 509         if (exact == NULL)
 510                 return NULL;
 511
 512         /* If there is no exactly matched one, then to the next valid one. */
 513         *exact = false;
 514
 515         /* The rbtree is empty. */
 516         if (rc == 0)
 517                 return NULL;
 518
 519         if (rc < 0)
 520                 return lrn;
 521
 522         node = rb_next(prev);
 523
 524         /* The end of the rbtree. */
 525         if (node == NULL)
 526                 return NULL;
 527
 528         lrn = rb_entry(node, struct lfsck_rbtree_node, lrn_node);
 529
 530         return lrn;
 531 }
 532
 533 static struct lfsck_rbtree_node *lfsck_rbtree_new(const struct lu_env *env,
 534                                                   const struct lu_fid *fid)
 535 {
 536         struct lfsck_rbtree_node *lrn;
 537
 538         OBD_ALLOC_PTR(lrn);
 539         if (lrn == NULL)
 540                 return ERR_PTR(-ENOMEM);
 541
 542         OBD_ALLOC(lrn->lrn_known_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 543         if (lrn->lrn_known_bitmap == NULL) {
 544                 OBD_FREE_PTR(lrn);
 545
 546                 return ERR_PTR(-ENOMEM);
 547         }
 548
 549         OBD_ALLOC(lrn->lrn_accessed_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 550         if (lrn->lrn_accessed_bitmap == NULL) {
 551                 OBD_FREE(lrn->lrn_known_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 552                 OBD_FREE_PTR(lrn);
 553
 554                 return ERR_PTR(-ENOMEM);
 555         }
 556
 557         RB_CLEAR_NODE(&lrn->lrn_node);
 558         lrn->lrn_seq = fid_seq(fid);
 559         lrn->lrn_first_oid = fid_oid(fid) & ~LFSCK_RBTREE_BITMAP_MASK;
 560         atomic_set(&lrn->lrn_known_count, 0);
 561         atomic_set(&lrn->lrn_accessed_count, 0);
 562
 563         return lrn;
 564 }
 565
 566 static void lfsck_rbtree_free(struct lfsck_rbtree_node *lrn)
 567 {
 568         OBD_FREE(lrn->lrn_accessed_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 569         OBD_FREE(lrn->lrn_known_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 570         OBD_FREE_PTR(lrn);
 571 }
 572
 573 /* The caller should hold lock. */
 574 static struct lfsck_rbtree_node *
 575 lfsck_rbtree_insert(struct lfsck_layout_slave_data *llsd,
 576                     struct lfsck_rbtree_node *lrn)
 577 {
 578         struct rb_node           **pos    = &llsd->llsd_rb_root.rb_node;
 579         struct rb_node            *parent = NULL;
 580         struct lfsck_rbtree_node  *tmp;
 581         int                        rc;
 582
 583         while (*pos != NULL) {
 584                 parent = *pos;
 585                 tmp = rb_entry(parent, struct lfsck_rbtree_node, lrn_node);
 586                 rc = lfsck_rbtree_cmp(tmp, lrn->lrn_seq, lrn->lrn_first_oid);
 587                 if (rc < 0)
 588                         pos = &(*pos)->rb_left;
 589                 else if (rc > 0)
 590                         pos = &(*pos)->rb_right;
 591                 else
 592                         return tmp;
 593         }
 594
 595         rb_link_node(&lrn->lrn_node, parent, pos);
 596         rb_insert_color(&lrn->lrn_node, &llsd->llsd_rb_root);
 597
 598         return lrn;
 599 }
 600
 601 extern const struct dt_index_operations lfsck_orphan_index_ops;
 602
 603 static int lfsck_rbtree_setup(const struct lu_env *env,
 604                               struct lfsck_component *com)
 605 {
 606         struct lu_fid                   *fid    = &lfsck_env_info(env)->lti_fid;
 607         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 608         struct dt_device                *dev    = lfsck->li_bottom;
 609         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
 610         struct dt_object                *obj;
 611
 612         fid->f_seq = FID_SEQ_LAYOUT_RBTREE;
 613         fid->f_oid = lfsck_dev_idx(dev);
 614         fid->f_ver = 0;
 615         obj = dt_locate(env, dev, fid);
 616         if (IS_ERR(obj))
 617                 RETURN(PTR_ERR(obj));
 618
 619         /* Generate an in-RAM object to stand for the layout rbtree.
 620          * Scanning the layout rbtree will be via the iteration over
 621          * the object. In the future, the rbtree may be written onto
 622          * disk with the object.
 623          *
 624          * Mark the object to be as exist. */
 625         obj->do_lu.lo_header->loh_attr |= LOHA_EXISTS;
 626         obj->do_index_ops = &lfsck_orphan_index_ops;
 627         llsd->llsd_rb_obj = obj;
 628         llsd->llsd_rbtree_valid = 1;
 629         dev->dd_record_fid_accessed = 1;
 630
 631         CDEBUG(D_LFSCK, "%s: layout LFSCK init OST-objects accessing bitmap\n",
 632                lfsck_lfsck2name(lfsck));
 633
 634         return 0;
 635 }
 636
 637 static void lfsck_rbtree_cleanup(const struct lu_env *env,
 638                                  struct lfsck_component *com)
 639 {
 640         struct lfsck_instance           *lfsck = com->lc_lfsck;
 641         struct lfsck_layout_slave_data  *llsd  = com->lc_data;
 642         struct rb_node                  *node  = rb_first(&llsd->llsd_rb_root);
 643         struct rb_node                  *next;
 644         struct lfsck_rbtree_node        *lrn;
 645
 646         lfsck->li_bottom->dd_record_fid_accessed = 0;
 647         /* Invalid the rbtree, then no others will use it. */
 648         write_lock(&llsd->llsd_rb_lock);
 649         llsd->llsd_rbtree_valid = 0;
 650         write_unlock(&llsd->llsd_rb_lock);
 651
 652         while (node != NULL) {
 653                 next = rb_next(node);
 654                 lrn = rb_entry(node, struct lfsck_rbtree_node, lrn_node);
 655                 rb_erase(node, &llsd->llsd_rb_root);
 656                 lfsck_rbtree_free(lrn);
 657                 node = next;
 658         }
 659
 660         if (llsd->llsd_rb_obj != NULL) {
 661                 lu_object_put(env, &llsd->llsd_rb_obj->do_lu);
 662                 llsd->llsd_rb_obj = NULL;
 663         }
 664
 665         CDEBUG(D_LFSCK, "%s: layout LFSCK fini OST-objects accessing bitmap\n",
 666                lfsck_lfsck2name(lfsck));
 667 }
 668
 669 static void lfsck_rbtree_update_bitmap(const struct lu_env *env,
 670                                        struct lfsck_component *com,
 671                                        const struct lu_fid *fid,
 672                                        bool accessed)
 673 {
 674         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
 675         struct lfsck_rbtree_node        *lrn;
 676         bool                             insert = false;
 677         int                              idx;
 678         int                              rc     = 0;
 679         ENTRY;
 680
 681         if (unlikely(!fid_is_sane(fid) || fid_is_last_id(fid)))
 682                 RETURN_EXIT;
 683
 684         if (!fid_is_idif(fid) && !fid_is_norm(fid))
 685                 RETURN_EXIT;
 686
 687         read_lock(&llsd->llsd_rb_lock);
 688         if (!llsd->llsd_rbtree_valid)
 689                 GOTO(unlock, rc = 0);
 690
 691         lrn = lfsck_rbtree_search(llsd, fid, NULL);
 692         if (lrn == NULL) {
 693                 struct lfsck_rbtree_node *tmp;
 694
 695                 LASSERT(!insert);
 696
 697                 read_unlock(&llsd->llsd_rb_lock);
 698                 tmp = lfsck_rbtree_new(env, fid);
 699                 if (IS_ERR(tmp))
 700                         GOTO(out, rc = PTR_ERR(tmp));
 701
 702                 insert = true;
 703                 write_lock(&llsd->llsd_rb_lock);
 704                 if (!llsd->llsd_rbtree_valid) {
 705                         lfsck_rbtree_free(tmp);
 706                         GOTO(unlock, rc = 0);
 707                 }
 708
 709                 lrn = lfsck_rbtree_insert(llsd, tmp);
 710                 if (lrn != tmp)
 711                         lfsck_rbtree_free(tmp);
 712         }
 713
 714         idx = fid_oid(fid) & LFSCK_RBTREE_BITMAP_MASK;
 715         /* Any accessed object must be a known object. */
 716         if (!test_and_set_bit(idx, lrn->lrn_known_bitmap))
 717                 atomic_inc(&lrn->lrn_known_count);
 718         if (accessed && !test_and_set_bit(idx, lrn->lrn_accessed_bitmap))
 719                 atomic_inc(&lrn->lrn_accessed_count);
 720
 721         GOTO(unlock, rc = 0);
 722
 723 unlock:
 724         if (insert)
 725                 write_unlock(&llsd->llsd_rb_lock);
 726         else
 727                 read_unlock(&llsd->llsd_rb_lock);
 728 out:
 729         if (rc != 0 && accessed) {
 730                 struct lfsck_layout *lo = com->lc_file_ram;
 731
 732                 CDEBUG(D_LFSCK, "%s: fail to update OST-objects accessing "
 733                        "bitmap, and will cause incorrect LFSCK OST-object "
 734                        "handling, so disable it to cancel orphan handling "
 735                        "for related device. rc = %d\n",
 736                        lfsck_lfsck2name(com->lc_lfsck), rc);
 737
 738                 lo->ll_flags |= LF_INCOMPLETE;
 739                 lfsck_rbtree_cleanup(env, com);
 740         }
 741 }
 742
 743 static void lfsck_layout_le_to_cpu(struct lfsck_layout *des,
 744                                    const struct lfsck_layout *src)
 745 {
 746         int i;
 747
 748         des->ll_magic = le32_to_cpu(src->ll_magic);
 749         des->ll_status = le32_to_cpu(src->ll_status);
 750         des->ll_flags = le32_to_cpu(src->ll_flags);
 751         des->ll_success_count = le32_to_cpu(src->ll_success_count);
 752         des->ll_run_time_phase1 = le32_to_cpu(src->ll_run_time_phase1);
 753         des->ll_run_time_phase2 = le32_to_cpu(src->ll_run_time_phase2);
 754         des->ll_time_last_complete = le64_to_cpu(src->ll_time_last_complete);
 755         des->ll_time_latest_start = le64_to_cpu(src->ll_time_latest_start);
 756         des->ll_time_last_checkpoint =
 757                                 le64_to_cpu(src->ll_time_last_checkpoint);
 758         des->ll_pos_latest_start = le64_to_cpu(src->ll_pos_latest_start);
 759         des->ll_pos_last_checkpoint = le64_to_cpu(src->ll_pos_last_checkpoint);
 760         des->ll_pos_first_inconsistent =
 761                         le64_to_cpu(src->ll_pos_first_inconsistent);
 762         des->ll_objs_checked_phase1 = le64_to_cpu(src->ll_objs_checked_phase1);
 763         des->ll_objs_failed_phase1 = le64_to_cpu(src->ll_objs_failed_phase1);
 764         des->ll_objs_checked_phase2 = le64_to_cpu(src->ll_objs_checked_phase2);
 765         des->ll_objs_failed_phase2 = le64_to_cpu(src->ll_objs_failed_phase2);
 766         for (i = 0; i < LLIT_MAX; i++)
 767                 des->ll_objs_repaired[i] =
 768                                 le64_to_cpu(src->ll_objs_repaired[i]);
 769         des->ll_objs_skipped = le64_to_cpu(src->ll_objs_skipped);
 770         des->ll_bitmap_size = le32_to_cpu(src->ll_bitmap_size);
 771 }
 772
 773 static void lfsck_layout_cpu_to_le(struct lfsck_layout *des,
 774                                    const struct lfsck_layout *src)
 775 {
 776         int i;
 777
 778         des->ll_magic = cpu_to_le32(src->ll_magic);
 779         des->ll_status = cpu_to_le32(src->ll_status);
 780         des->ll_flags = cpu_to_le32(src->ll_flags);
 781         des->ll_success_count = cpu_to_le32(src->ll_success_count);
 782         des->ll_run_time_phase1 = cpu_to_le32(src->ll_run_time_phase1);
 783         des->ll_run_time_phase2 = cpu_to_le32(src->ll_run_time_phase2);
 784         des->ll_time_last_complete = cpu_to_le64(src->ll_time_last_complete);
 785         des->ll_time_latest_start = cpu_to_le64(src->ll_time_latest_start);
 786         des->ll_time_last_checkpoint =
 787                                 cpu_to_le64(src->ll_time_last_checkpoint);
 788         des->ll_pos_latest_start = cpu_to_le64(src->ll_pos_latest_start);
 789         des->ll_pos_last_checkpoint = cpu_to_le64(src->ll_pos_last_checkpoint);
 790         des->ll_pos_first_inconsistent =
 791                         cpu_to_le64(src->ll_pos_first_inconsistent);
 792         des->ll_objs_checked_phase1 = cpu_to_le64(src->ll_objs_checked_phase1);
 793         des->ll_objs_failed_phase1 = cpu_to_le64(src->ll_objs_failed_phase1);
 794         des->ll_objs_checked_phase2 = cpu_to_le64(src->ll_objs_checked_phase2);
 795         des->ll_objs_failed_phase2 = cpu_to_le64(src->ll_objs_failed_phase2);
 796         for (i = 0; i < LLIT_MAX; i++)
 797                 des->ll_objs_repaired[i] =
 798                                 cpu_to_le64(src->ll_objs_repaired[i]);
 799         des->ll_objs_skipped = cpu_to_le64(src->ll_objs_skipped);
 800         des->ll_bitmap_size = cpu_to_le32(src->ll_bitmap_size);
 801 }
 802
 803 /**
 804  * Load the OST bitmap from the lfsck_layout trace file.
 805  *
 806  * \param[in] env       pointer to the thread context
 807  * \param[in] com       pointer to the lfsck component
 808  *
 809  * \retval              0 for success
 810  * \retval              negative error number on failure or data corruption
 811  */
 812 static int lfsck_layout_load_bitmap(const struct lu_env *env,
 813                                     struct lfsck_component *com)
 814 {
 815         struct dt_object                *obj    = com->lc_obj;
 816         struct lfsck_assistant_data     *lad    = com->lc_data;
 817         struct lfsck_layout             *lo     = com->lc_file_ram;
 818         cfs_bitmap_t                    *bitmap = lad->lad_bitmap;
 819         loff_t                           pos    = com->lc_file_size;
 820         ssize_t                          size;
 821         __u32                            nbits;
 822         int                              rc;
 823         ENTRY;
 824
 825         if (com->lc_lfsck->li_ost_descs.ltd_tgts_bitmap->size >
 826             lo->ll_bitmap_size)
 827                 nbits = com->lc_lfsck->li_ost_descs.ltd_tgts_bitmap->size;
 828         else
 829                 nbits = lo->ll_bitmap_size;
 830
 831         if (unlikely(nbits < BITS_PER_LONG))
 832                 nbits = BITS_PER_LONG;
 833
 834         if (nbits > bitmap->size) {
 835                 __u32 new_bits = bitmap->size;
 836                 cfs_bitmap_t *new_bitmap;
 837
 838                 while (new_bits < nbits)
 839                         new_bits <<= 1;
 840
 841                 new_bitmap = CFS_ALLOCATE_BITMAP(new_bits);
 842                 if (new_bitmap == NULL)
 843                         RETURN(-ENOMEM);
 844
 845                 lad->lad_bitmap = new_bitmap;
 846                 CFS_FREE_BITMAP(bitmap);
 847                 bitmap = new_bitmap;
 848         }
 849
 850         if (lo->ll_bitmap_size == 0) {
 851                 lad->lad_incomplete = 0;
 852                 CFS_RESET_BITMAP(bitmap);
 853
 854                 RETURN(0);
 855         }
 856
 857         size = (lo->ll_bitmap_size + 7) >> 3;
 858         rc = dt_read(env, obj, lfsck_buf_get(env, bitmap->data, size), &pos);
 859         if (rc != size)
 860                 RETURN(rc >= 0 ? -EINVAL : rc);
 861
 862         if (cfs_bitmap_check_empty(bitmap))
 863                 lad->lad_incomplete = 0;
 864         else
 865                 lad->lad_incomplete = 1;
 866
 867         RETURN(0);
 868 }
 869
 870 /**
 871  * Load the layout LFSCK trace file from disk.
 872  *
 873  * The layout LFSCK trace file records the layout LFSCK status information
 874  * and other statistics, such as how many objects have been scanned, and how
 875  * many objects have been repaired, and etc. It also contains the bitmap for
 876  * failed OSTs during the layout LFSCK. All these information will be loaded
 877  * from disk to RAM when the layout LFSCK component setup.
 878  *
 879  * \param[in] env       pointer to the thread context
 880  * \param[in] com       pointer to the lfsck component
 881  *
 882  * \retval              positive number for file data corruption, the caller
 883  *                      should reset the layout LFSCK trace file
 884  * \retval              0 for success
 885  * \retval              negative error number on failure
 886  */
 887 static int lfsck_layout_load(const struct lu_env *env,
 888                              struct lfsck_component *com)
 889 {
 890         struct lfsck_layout             *lo     = com->lc_file_ram;
 891         ssize_t                          size   = com->lc_file_size;
 892         loff_t                           pos    = 0;
 893         int                              rc;
 894
 895         rc = dt_read(env, com->lc_obj,
 896                      lfsck_buf_get(env, com->lc_file_disk, size), &pos);
 897         if (rc == 0) {
 898                 return -ENOENT;
 899         } else if (rc < 0) {
 900                 CDEBUG(D_LFSCK, "%s: failed to load lfsck_layout: rc = %d\n",
 901                        lfsck_lfsck2name(com->lc_lfsck), rc);
 902                 return rc;
 903         } else if (rc != size) {
 904                 CDEBUG(D_LFSCK, "%s: lfsck_layout size %u != %u; reset it\n",
 905                        lfsck_lfsck2name(com->lc_lfsck), rc, (unsigned int)size);
 906                 return 1;
 907         }
 908
 909         lfsck_layout_le_to_cpu(lo, com->lc_file_disk);
 910         if (lo->ll_magic != LFSCK_LAYOUT_MAGIC) {
 911                 CDEBUG(D_LFSCK, "%s: invalid lfsck_layout magic %#x != %#x, "
 912                        "to be reset\n", lfsck_lfsck2name(com->lc_lfsck),
 913                        lo->ll_magic, LFSCK_LAYOUT_MAGIC);
 914                 return 1;
 915         }
 916
 917         return 0;
 918 }
 919
 920 /**
 921  * Store the layout LFSCK trace file on disk.
 922  *
 923  * The layout LFSCK trace file records the layout LFSCK status information
 924  * and other statistics, such as how many objects have been scanned, and how
 925  * many objects have been repaired, and etc. It also contains the bitmap for
 926  * failed OSTs during the layout LFSCK. All these information will be synced
 927  * from RAM to disk periodically.
 928  *
 929  * \param[in] env       pointer to the thread context
 930  * \param[in] com       pointer to the lfsck component
 931  *
 932  * \retval              0 for success
 933  * \retval              negative error number on failure
 934  */
 935 static int lfsck_layout_store(const struct lu_env *env,
 936                               struct lfsck_component *com)
 937 {
 938         struct dt_object        *obj    = com->lc_obj;
 939         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 940         struct lfsck_layout     *lo_ram = com->lc_file_ram;
 941         struct lfsck_layout     *lo     = com->lc_file_disk;
 942         struct thandle          *th;
 943         struct dt_device        *dev    = lfsck->li_bottom;
 944         cfs_bitmap_t            *bitmap = NULL;
 945         loff_t                   pos;
 946         ssize_t                  size   = com->lc_file_size;
 947         __u32                    nbits  = 0;
 948         int                      rc;
 949         ENTRY;
 950
 951         if (lfsck->li_master) {
 952                 struct lfsck_assistant_data *lad = com->lc_data;
 953
 954                 bitmap = lad->lad_bitmap;
 955                 nbits = bitmap->size;
 956
 957                 LASSERT(nbits > 0);
 958                 LASSERTF((nbits & 7) == 0, "Invalid nbits %u\n", nbits);
 959         }
 960
 961         lo_ram->ll_bitmap_size = nbits;
 962         lfsck_layout_cpu_to_le(lo, lo_ram);
 963         th = dt_trans_create(env, dev);
 964         if (IS_ERR(th))
 965                 GOTO(log, rc = PTR_ERR(th));
 966
 967         rc = dt_declare_record_write(env, obj, lfsck_buf_get(env, lo, size),
 968                                      (loff_t)0, th);
 969         if (rc != 0)
 970                 GOTO(out, rc);
 971
 972         if (bitmap != NULL) {
 973                 rc = dt_declare_record_write(env, obj,
 974                                 lfsck_buf_get(env, bitmap->data, nbits >> 3),
 975                                 (loff_t)size, th);
 976                 if (rc != 0)
 977                         GOTO(out, rc);
 978         }
 979
 980         rc = dt_trans_start_local(env, dev, th);
 981         if (rc != 0)
 982                 GOTO(out, rc);
 983
 984         pos = 0;
 985         rc = dt_record_write(env, obj, lfsck_buf_get(env, lo, size), &pos, th);
 986         if (rc != 0)
 987                 GOTO(out, rc);
 988
 989         if (bitmap != NULL) {
 990                 pos = size;
 991                 rc = dt_record_write(env, obj,
 992                                 lfsck_buf_get(env, bitmap->data, nbits >> 3),
 993                                 &pos, th);
 994         }
 995
 996         GOTO(out, rc);
 997
 998 out:
 999         dt_trans_stop(env, dev, th);
1000
1001 log:
1002         if (rc != 0)
1003                 CDEBUG(D_LFSCK, "%s: fail to store lfsck_layout: rc = %d\n",
1004                        lfsck_lfsck2name(lfsck), rc);
1005
1006         return rc;
1007 }
1008
1009 static int lfsck_layout_init(const struct lu_env *env,
1010                              struct lfsck_component *com)
1011 {
1012         struct lfsck_layout *lo = com->lc_file_ram;
1013         int rc;
1014
1015         memset(lo, 0, com->lc_file_size);
1016         lo->ll_magic = LFSCK_LAYOUT_MAGIC;
1017         lo->ll_status = LS_INIT;
1018         down_write(&com->lc_sem);
1019         rc = lfsck_layout_store(env, com);
1020         up_write(&com->lc_sem);
1021
1022         return rc;
1023 }
1024
1025 static int fid_is_for_ostobj(const struct lu_env *env, struct dt_device *dt,
1026                              struct dt_object *obj, const struct lu_fid *fid)
1027 {
1028         struct seq_server_site  *ss     = lu_site2seq(dt->dd_lu_dev.ld_site);
1029         struct lu_seq_range     *range  = &lfsck_env_info(env)->lti_range;
1030         struct lustre_mdt_attrs *lma;
1031         int                      rc;
1032
1033         fld_range_set_any(range);
1034         rc = fld_server_lookup(env, ss->ss_server_fld, fid_seq(fid), range);
1035         if (rc == 0) {
1036                 if (fld_range_is_ost(range))
1037                         return 1;
1038
1039                 return 0;
1040         }
1041
1042         lma = &lfsck_env_info(env)->lti_lma;
1043         rc = dt_xattr_get(env, obj, lfsck_buf_get(env, lma, sizeof(*lma)),
1044                           XATTR_NAME_LMA, BYPASS_CAPA);
1045         if (rc == sizeof(*lma)) {
1046                 lustre_lma_swab(lma);
1047
1048                 return lma->lma_compat & LMAC_FID_ON_OST ? 1 : 0;
1049         }
1050
1051         rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_FID, BYPASS_CAPA);
1052
1053         return rc > 0;
1054 }
1055
1056 static struct lfsck_layout_seq *
1057 lfsck_layout_seq_lookup(struct lfsck_layout_slave_data *llsd, __u64 seq)
1058 {
1059         struct lfsck_layout_seq *lls;
1060
1061         list_for_each_entry(lls, &llsd->llsd_seq_list, lls_list) {
1062                 if (lls->lls_seq == seq)
1063                         return lls;
1064
1065                 if (lls->lls_seq > seq)
1066                         return NULL;
1067         }
1068
1069         return NULL;
1070 }
1071
1072 static void
1073 lfsck_layout_seq_insert(struct lfsck_layout_slave_data *llsd,
1074                         struct lfsck_layout_seq *lls)
1075 {
1076         struct lfsck_layout_seq *tmp;
1077         struct list_head        *pos = &llsd->llsd_seq_list;
1078
1079         list_for_each_entry(tmp, &llsd->llsd_seq_list, lls_list) {
1080                 if (lls->lls_seq < tmp->lls_seq) {
1081                         pos = &tmp->lls_list;
1082                         break;
1083                 }
1084         }
1085         list_add_tail(&lls->lls_list, pos);
1086 }
1087
1088 static int
1089 lfsck_layout_lastid_create(const struct lu_env *env,
1090                            struct lfsck_instance *lfsck,
1091                            struct dt_object *obj)
1092 {
1093         struct lfsck_thread_info *info   = lfsck_env_info(env);
1094         struct lu_attr           *la     = &info->lti_la;
1095         struct dt_object_format  *dof    = &info->lti_dof;
1096         struct lfsck_bookmark    *bk     = &lfsck->li_bookmark_ram;
1097         struct dt_device         *dt     = lfsck->li_bottom;
1098         struct thandle           *th;
1099         __u64                     lastid = 0;
1100         loff_t                    pos    = 0;
1101         int                       rc;
1102         ENTRY;
1103
1104         if (bk->lb_param & LPF_DRYRUN)
1105                 return 0;
1106
1107         memset(la, 0, sizeof(*la));
1108         la->la_mode = S_IFREG |  S_IRUGO | S_IWUSR;
1109         la->la_valid = LA_MODE | LA_UID | LA_GID;
1110         dof->dof_type = dt_mode_to_dft(S_IFREG);
1111
1112         th = dt_trans_create(env, dt);
1113         if (IS_ERR(th))
1114                 GOTO(log, rc = PTR_ERR(th));
1115
1116         rc = dt_declare_create(env, obj, la, NULL, dof, th);
1117         if (rc != 0)
1118                 GOTO(stop, rc);
1119
1120         rc = dt_declare_record_write(env, obj,
1121                                      lfsck_buf_get(env, &lastid,
1122                                                    sizeof(lastid)),
1123                                      pos, th);
1124         if (rc != 0)
1125                 GOTO(stop, rc);
1126
1127         rc = dt_trans_start_local(env, dt, th);
1128         if (rc != 0)
1129                 GOTO(stop, rc);
1130
1131         dt_write_lock(env, obj, 0);
1132         if (likely(dt_object_exists(obj) == 0)) {
1133                 rc = dt_create(env, obj, la, NULL, dof, th);
1134                 if (rc == 0)
1135                         rc = dt_record_write(env, obj,
1136                                 lfsck_buf_get(env, &lastid, sizeof(lastid)),
1137                                 &pos, th);
1138         }
1139         dt_write_unlock(env, obj);
1140
1141         GOTO(stop, rc);
1142
1143 stop:
1144         dt_trans_stop(env, dt, th);
1145
1146 log:
1147         CDEBUG(D_LFSCK, "%s: layout LFSCK will create LAST_ID for <seq> "
1148                LPX64": rc = %d\n",
1149                lfsck_lfsck2name(lfsck), fid_seq(lfsck_dto2fid(obj)), rc);
1150
1151         return rc;
1152 }
1153
1154 static int
1155 lfsck_layout_lastid_reload(const struct lu_env *env,
1156                            struct lfsck_component *com,
1157                            struct lfsck_layout_seq *lls)
1158 {
1159         __u64   lastid;
1160         loff_t  pos     = 0;
1161         int     rc;
1162
1163         dt_read_lock(env, lls->lls_lastid_obj, 0);
1164         rc = dt_record_read(env, lls->lls_lastid_obj,
1165                             lfsck_buf_get(env, &lastid, sizeof(lastid)), &pos);
1166         dt_read_unlock(env, lls->lls_lastid_obj);
1167         if (unlikely(rc != 0))
1168                 return rc;
1169
1170         lastid = le64_to_cpu(lastid);
1171         if (lastid < lls->lls_lastid_known) {
1172                 struct lfsck_instance   *lfsck  = com->lc_lfsck;
1173                 struct lfsck_layout     *lo     = com->lc_file_ram;
1174
1175                 lls->lls_lastid = lls->lls_lastid_known;
1176                 lls->lls_dirty = 1;
1177                 if (!(lo->ll_flags & LF_CRASHED_LASTID)) {
1178                         LASSERT(lfsck->li_out_notify != NULL);
1179
1180                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
1181                                              LE_LASTID_REBUILDING);
1182                         lo->ll_flags |= LF_CRASHED_LASTID;
1183
1184                         CDEBUG(D_LFSCK, "%s: layout LFSCK finds crashed "
1185                                "LAST_ID file (1) for the sequence "LPX64
1186                                ", old value "LPU64", known value "LPU64"\n",
1187                                lfsck_lfsck2name(lfsck), lls->lls_seq,
1188                                lastid, lls->lls_lastid);
1189                 }
1190         } else if (lastid >= lls->lls_lastid) {
1191                 lls->lls_lastid = lastid;
1192                 lls->lls_dirty = 0;
1193         }
1194
1195         return 0;
1196 }
1197
1198 static int
1199 lfsck_layout_lastid_store(const struct lu_env *env,
1200                           struct lfsck_component *com)
1201 {
1202         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1203         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
1204         struct dt_device                *dt     = lfsck->li_bottom;
1205         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
1206         struct lfsck_layout_seq         *lls;
1207         struct thandle                  *th;
1208         __u64                            lastid;
1209         int                              rc     = 0;
1210         int                              rc1    = 0;
1211
1212         list_for_each_entry(lls, &llsd->llsd_seq_list, lls_list) {
1213                 loff_t pos = 0;
1214
1215                 if (!lls->lls_dirty)
1216                         continue;
1217
1218                 CDEBUG(D_LFSCK, "%s: layout LFSCK will sync the LAST_ID for "
1219                        "<seq> "LPX64" as <oid> "LPU64"\n",
1220                        lfsck_lfsck2name(lfsck), lls->lls_seq, lls->lls_lastid);
1221
1222                 if (bk->lb_param & LPF_DRYRUN) {
1223                         lls->lls_dirty = 0;
1224                         continue;
1225                 }
1226
1227                 th = dt_trans_create(env, dt);
1228                 if (IS_ERR(th)) {
1229                         rc1 = PTR_ERR(th);
1230                         CDEBUG(D_LFSCK, "%s: layout LFSCK failed to store "
1231                                "the LAST_ID for <seq> "LPX64"(1): rc = %d\n",
1232                                lfsck_lfsck2name(com->lc_lfsck),
1233                                lls->lls_seq, rc1);
1234                         continue;
1235                 }
1236
1237                 lastid = cpu_to_le64(lls->lls_lastid);
1238                 rc = dt_declare_record_write(env, lls->lls_lastid_obj,
1239                                              lfsck_buf_get(env, &lastid,
1240                                                            sizeof(lastid)),
1241                                              pos, th);
1242                 if (rc != 0)
1243                         goto stop;
1244
1245                 rc = dt_trans_start_local(env, dt, th);
1246                 if (rc != 0)
1247                         goto stop;
1248
1249                 dt_write_lock(env, lls->lls_lastid_obj, 0);
1250                 rc = dt_record_write(env, lls->lls_lastid_obj,
1251                                      lfsck_buf_get(env, &lastid,
1252                                      sizeof(lastid)), &pos, th);
1253                 dt_write_unlock(env, lls->lls_lastid_obj);
1254                 if (rc == 0)
1255                         lls->lls_dirty = 0;
1256
1257 stop:
1258                 dt_trans_stop(env, dt, th);
1259                 if (rc != 0) {
1260                         rc1 = rc;
1261                         CDEBUG(D_LFSCK, "%s: layout LFSCK failed to store "
1262                                "the LAST_ID for <seq> "LPX64"(2): rc = %d\n",
1263                                lfsck_lfsck2name(com->lc_lfsck),
1264                                lls->lls_seq, rc1);
1265                 }
1266         }
1267
1268         return rc1;
1269 }
1270
1271 static int
1272 lfsck_layout_lastid_load(const struct lu_env *env,
1273                          struct lfsck_component *com,
1274                          struct lfsck_layout_seq *lls)
1275 {
1276         struct lfsck_instance   *lfsck  = com->lc_lfsck;
1277         struct lfsck_layout     *lo     = com->lc_file_ram;
1278         struct lu_fid           *fid    = &lfsck_env_info(env)->lti_fid;
1279         struct dt_object        *obj;
1280         loff_t                   pos    = 0;
1281         int                      rc;
1282         ENTRY;
1283
1284         lu_last_id_fid(fid, lls->lls_seq, lfsck_dev_idx(lfsck->li_bottom));
1285         obj = dt_locate(env, lfsck->li_bottom, fid);
1286         if (IS_ERR(obj))
1287                 RETURN(PTR_ERR(obj));
1288
1289         /* LAST_ID crashed, to be rebuilt */
1290         if (dt_object_exists(obj) == 0) {
1291                 if (!(lo->ll_flags & LF_CRASHED_LASTID)) {
1292                         LASSERT(lfsck->li_out_notify != NULL);
1293
1294                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
1295                                              LE_LASTID_REBUILDING);
1296                         lo->ll_flags |= LF_CRASHED_LASTID;
1297
1298                         CDEBUG(D_LFSCK, "%s: layout LFSCK cannot find the "
1299                                "LAST_ID file for sequence "LPX64"\n",
1300                                lfsck_lfsck2name(lfsck), lls->lls_seq);
1301
1302                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_DELAY4) &&
1303                             cfs_fail_val > 0) {
1304                                 struct l_wait_info lwi = LWI_TIMEOUT(
1305                                                 cfs_time_seconds(cfs_fail_val),
1306                                                 NULL, NULL);
1307
1308                                 /* Some others may changed the cfs_fail_val
1309                                  * as zero after above check, re-check it for
1310                                  * sure to avoid falling into wait for ever. */
1311                                 if (likely(lwi.lwi_timeout > 0)) {
1312                                         struct ptlrpc_thread *thread =
1313                                                 &lfsck->li_thread;
1314
1315                                         up_write(&com->lc_sem);
1316                                         l_wait_event(thread->t_ctl_waitq,
1317                                                      !thread_is_running(thread),
1318                                                      &lwi);
1319                                         down_write(&com->lc_sem);
1320                                 }
1321                         }
1322                 }
1323
1324                 rc = lfsck_layout_lastid_create(env, lfsck, obj);
1325         } else {
1326                 dt_read_lock(env, obj, 0);
1327                 rc = dt_read(env, obj,
1328                         lfsck_buf_get(env, &lls->lls_lastid, sizeof(__u64)),
1329                         &pos);
1330                 dt_read_unlock(env, obj);
1331                 if (rc != 0 && rc != sizeof(__u64))
1332                         GOTO(out, rc = (rc > 0 ? -EFAULT : rc));
1333
1334                 if (rc == 0 && !(lo->ll_flags & LF_CRASHED_LASTID)) {
1335                         LASSERT(lfsck->li_out_notify != NULL);
1336
1337                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
1338                                              LE_LASTID_REBUILDING);
1339                         lo->ll_flags |= LF_CRASHED_LASTID;
1340
1341                         CDEBUG(D_LFSCK, "%s: layout LFSCK finds invalid "
1342                                "LAST_ID file for the sequence "LPX64
1343                                ": rc = %d\n",
1344                                lfsck_lfsck2name(lfsck), lls->lls_seq, rc);
1345                 }
1346
1347                 lls->lls_lastid = le64_to_cpu(lls->lls_lastid);
1348                 rc = 0;
1349         }
1350
1351         GOTO(out, rc);
1352
1353 out:
1354         if (rc != 0)
1355                 lfsck_object_put(env, obj);
1356         else
1357                 lls->lls_lastid_obj = obj;
1358
1359         return rc;
1360 }
1361
1362 static void lfsck_layout_record_failure(const struct lu_env *env,
1363                                         struct lfsck_instance *lfsck,
1364                                         struct lfsck_layout *lo)
1365 {
1366         __u64 cookie;
1367
1368         lo->ll_objs_failed_phase1++;
1369         cookie = lfsck->li_obj_oit->do_index_ops->dio_it.store(env,
1370                                                         lfsck->li_di_oit);
1371         if (lo->ll_pos_first_inconsistent == 0 ||
1372             lo->ll_pos_first_inconsistent < cookie) {
1373                 lo->ll_pos_first_inconsistent = cookie;
1374
1375                 CDEBUG(D_LFSCK, "%s: layout LFSCK hit first non-repaired "
1376                        "inconsistency at the pos ["LPU64"]\n",
1377                        lfsck_lfsck2name(lfsck),
1378                        lo->ll_pos_first_inconsistent);
1379         }
1380 }
1381
1382 static int lfsck_layout_double_scan_result(const struct lu_env *env,
1383                                            struct lfsck_component *com,
1384                                            int rc)
1385 {
1386         struct lfsck_instance   *lfsck = com->lc_lfsck;
1387         struct lfsck_layout     *lo    = com->lc_file_ram;
1388
1389         down_write(&com->lc_sem);
1390         lo->ll_run_time_phase2 += cfs_duration_sec(cfs_time_current() +
1391                                 HALF_SEC - lfsck->li_time_last_checkpoint);
1392         lo->ll_time_last_checkpoint = cfs_time_current_sec();
1393         lo->ll_objs_checked_phase2 += com->lc_new_checked;
1394
1395         if (rc > 0) {
1396                 if (lo->ll_flags & LF_INCOMPLETE) {
1397                         lo->ll_status = LS_PARTIAL;
1398                 } else {
1399                         if (lfsck->li_master) {
1400                                 struct lfsck_assistant_data *lad = com->lc_data;
1401
1402                                 if (lad->lad_incomplete)
1403                                         lo->ll_status = LS_PARTIAL;
1404                                 else
1405                                         lo->ll_status = LS_COMPLETED;
1406                         } else {
1407                                 lo->ll_status = LS_COMPLETED;
1408                         }
1409                 }
1410                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN))
1411                         lo->ll_flags &= ~(LF_SCANNED_ONCE | LF_INCONSISTENT);
1412                 lo->ll_time_last_complete = lo->ll_time_last_checkpoint;
1413                 lo->ll_success_count++;
1414         } else if (rc == 0) {
1415                 if (lfsck->li_status != 0)
1416                         lo->ll_status = lfsck->li_status;
1417                 else
1418                         lo->ll_status = LS_STOPPED;
1419         } else {
1420                 lo->ll_status = LS_FAILED;
1421         }
1422
1423         rc = lfsck_layout_store(env, com);
1424         up_write(&com->lc_sem);
1425
1426         return rc;
1427 }
1428
1429 static int lfsck_layout_trans_stop(const struct lu_env *env,
1430                                    struct dt_device *dev,
1431                                    struct thandle *handle, int result)
1432 {
1433         int rc;
1434
1435         handle->th_result = result;
1436         rc = dt_trans_stop(env, dev, handle);
1437         if (rc > 0)
1438                 rc = 0;
1439         else if (rc == 0)
1440                 rc = 1;
1441
1442         return rc;
1443 }
1444
1445 /**
1446  * Get the system default stripe size.
1447  *
1448  * \param[in] env       pointer to the thread context
1449  * \param[in] lfsck     pointer to the lfsck instance
1450  * \param[out] size     pointer to the default stripe size
1451  *
1452  * \retval              0 for success
1453  * \retval              negative error number on failure
1454  */
1455 static int lfsck_layout_get_def_stripesize(const struct lu_env *env,
1456                                            struct lfsck_instance *lfsck,
1457                                            __u32 *size)
1458 {
1459         struct lov_user_md      *lum = &lfsck_env_info(env)->lti_lum;
1460         struct dt_object        *root;
1461         int                      rc;
1462
1463         root = dt_locate(env, lfsck->li_next, &lfsck->li_local_root_fid);
1464         if (IS_ERR(root))
1465                 return PTR_ERR(root);
1466
1467         /* Get the default stripe size via xattr_get on the backend root. */
1468         rc = dt_xattr_get(env, root, lfsck_buf_get(env, lum, sizeof(*lum)),
1469                           XATTR_NAME_LOV, BYPASS_CAPA);
1470         if (rc > 0) {
1471                 /* The lum->lmm_stripe_size is LE mode. The *size also
1472                  * should be LE mode. So it is unnecessary to convert. */
1473                 *size = lum->lmm_stripe_size;
1474                 rc = 0;
1475         } else if (unlikely(rc == 0)) {
1476                 rc = -EINVAL;
1477         }
1478
1479         lfsck_object_put(env, root);
1480
1481         return rc;
1482 }
1483
1484 /**
1485  * \retval       +1: repaired
1486  * \retval        0: did nothing
1487  * \retval      -ve: on error
1488  */
1489 static int lfsck_layout_refill_lovea(const struct lu_env *env,
1490                                      struct thandle *handle,
1491                                      struct dt_object *parent,
1492                                      struct lu_fid *cfid,
1493                                      struct lu_buf *buf,
1494                                      struct lov_ost_data_v1 *slot,
1495                                      int fl, __u32 ost_idx)
1496 {
1497         struct ost_id           *oi     = &lfsck_env_info(env)->lti_oi;
1498         struct lov_mds_md_v1    *lmm    = buf->lb_buf;
1499         struct lu_buf            ea_buf;
1500         int                      rc;
1501         __u32                    magic;
1502         __u16                    count;
1503
1504         magic = le32_to_cpu(lmm->lmm_magic);
1505         count = le16_to_cpu(lmm->lmm_stripe_count);
1506
1507         fid_to_ostid(cfid, oi);
1508         ostid_cpu_to_le(oi, &slot->l_ost_oi);
1509         slot->l_ost_gen = cpu_to_le32(0);
1510         slot->l_ost_idx = cpu_to_le32(ost_idx);
1511
1512         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_HOLE) {
1513                 struct lov_ost_data_v1 *objs;
1514                 int                     i;
1515
1516                 if (magic == LOV_MAGIC_V1)
1517                         objs = &lmm->lmm_objects[0];
1518                 else
1519                         objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
1520                 for (i = 0; i < count; i++, objs++) {
1521                         if (objs != slot && lovea_slot_is_dummy(objs))
1522                                 break;
1523                 }
1524
1525                 /* If the @slot is the last dummy slot to be refilled,
1526                  * then drop LOV_PATTERN_F_HOLE from lmm::lmm_pattern. */
1527                 if (i == count)
1528                         lmm->lmm_pattern &= ~cpu_to_le32(LOV_PATTERN_F_HOLE);
1529         }
1530
1531         lfsck_buf_init(&ea_buf, lmm, lov_mds_md_size(count, magic));
1532         rc = dt_xattr_set(env, parent, &ea_buf, XATTR_NAME_LOV, fl, handle,
1533                           BYPASS_CAPA);
1534         if (rc == 0)
1535                 rc = 1;
1536
1537         return rc;
1538 }
1539
1540 /**
1541  * \retval       +1: repaired
1542  * \retval        0: did nothing
1543  * \retval      -ve: on error
1544  */
1545 static int lfsck_layout_extend_lovea(const struct lu_env *env,
1546                                      struct lfsck_instance *lfsck,
1547                                      struct thandle *handle,
1548                                      struct dt_object *parent,
1549                                      struct lu_fid *cfid,
1550                                      struct lu_buf *buf, int fl,
1551                                      __u32 ost_idx, __u32 ea_off, bool reset)
1552 {
1553         struct lov_mds_md_v1    *lmm    = buf->lb_buf;
1554         struct lov_ost_data_v1  *objs;
1555         int                      rc;
1556         __u16                    count;
1557         bool                     hole   = false;
1558         ENTRY;
1559
1560         if (fl == LU_XATTR_CREATE || reset) {
1561                 __u32 pattern = LOV_PATTERN_RAID0;
1562
1563                 count = ea_off + 1;
1564                 LASSERT(buf->lb_len >= lov_mds_md_size(count, LOV_MAGIC_V1));
1565
1566                 if (ea_off != 0 || reset) {
1567                         pattern |= LOV_PATTERN_F_HOLE;
1568                         hole = true;
1569                 }
1570
1571                 memset(lmm, 0, buf->lb_len);
1572                 lmm->lmm_magic = cpu_to_le32(LOV_MAGIC_V1);
1573                 lmm->lmm_pattern = cpu_to_le32(pattern);
1574                 fid_to_lmm_oi(lfsck_dto2fid(parent), &lmm->lmm_oi);
1575                 lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
1576
1577                 rc = lfsck_layout_get_def_stripesize(env, lfsck,
1578                                                      &lmm->lmm_stripe_size);
1579                 if (rc != 0)
1580                         RETURN(rc);
1581
1582                 objs = &lmm->lmm_objects[ea_off];
1583         } else {
1584                 __u32   magic = le32_to_cpu(lmm->lmm_magic);
1585                 int     gap;
1586
1587                 count = le16_to_cpu(lmm->lmm_stripe_count);
1588                 if (magic == LOV_MAGIC_V1)
1589                         objs = &lmm->lmm_objects[count];
1590                 else
1591                         objs = &((struct lov_mds_md_v3 *)lmm)->
1592                                                         lmm_objects[count];
1593
1594                 gap = ea_off - count;
1595                 if (gap >= 0)
1596                         count = ea_off + 1;
1597                 LASSERT(buf->lb_len >= lov_mds_md_size(count, magic));
1598
1599                 if (gap > 0) {
1600                         memset(objs, 0, gap * sizeof(*objs));
1601                         lmm->lmm_pattern |= cpu_to_le32(LOV_PATTERN_F_HOLE);
1602                         hole = true;
1603                 }
1604
1605                 lmm->lmm_layout_gen =
1606                             cpu_to_le16(le16_to_cpu(lmm->lmm_layout_gen) + 1);
1607                 objs += gap;
1608         }
1609
1610         lmm->lmm_stripe_count = cpu_to_le16(count);
1611         rc = lfsck_layout_refill_lovea(env, handle, parent, cfid, buf, objs,
1612                                        fl, ost_idx);
1613
1614         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant extend layout EA for "
1615                DFID": parent "DFID", OST-index %u, stripe-index %u, fl %d, "
1616                "reset %s, %s LOV EA hole: rc = %d\n",
1617                lfsck_lfsck2name(lfsck), PFID(cfid), PFID(lfsck_dto2fid(parent)),
1618                ost_idx, ea_off, fl, reset ? "yes" : "no",
1619                hole ? "with" : "without", rc);
1620
1621         RETURN(rc);
1622 }
1623
1624 /**
1625  * \retval       +1: repaired
1626  * \retval        0: did nothing
1627  * \retval      -ve: on error
1628  */
1629 static int lfsck_layout_update_pfid(const struct lu_env *env,
1630                                     struct lfsck_component *com,
1631                                     struct dt_object *parent,
1632                                     struct lu_fid *cfid,
1633                                     struct dt_device *cdev, __u32 ea_off)
1634 {
1635         struct filter_fid       *pfid   = &lfsck_env_info(env)->lti_new_pfid;
1636         struct dt_object        *child;
1637         struct thandle          *handle;
1638         const struct lu_fid     *tfid   = lu_object_fid(&parent->do_lu);
1639         struct lu_buf           *buf;
1640         int                      rc     = 0;
1641         ENTRY;
1642
1643         child = lfsck_object_find_by_dev(env, cdev, cfid);
1644         if (IS_ERR(child))
1645                 RETURN(PTR_ERR(child));
1646
1647         handle = dt_trans_create(env, cdev);
1648         if (IS_ERR(handle))
1649                 GOTO(out, rc = PTR_ERR(handle));
1650
1651         pfid->ff_parent.f_seq = cpu_to_le64(tfid->f_seq);
1652         pfid->ff_parent.f_oid = cpu_to_le32(tfid->f_oid);
1653         /* Currently, the filter_fid::ff_parent::f_ver is not the real parent
1654          * MDT-object's FID::f_ver, instead it is the OST-object index in its
1655          * parent MDT-object's layout EA. */
1656         pfid->ff_parent.f_stripe_idx = cpu_to_le32(ea_off);
1657         buf = lfsck_buf_get(env, pfid, sizeof(struct filter_fid));
1658
1659         rc = dt_declare_xattr_set(env, child, buf, XATTR_NAME_FID, 0, handle);
1660         if (rc != 0)
1661                 GOTO(stop, rc);
1662
1663         rc = dt_trans_start(env, cdev, handle);
1664         if (rc != 0)
1665                 GOTO(stop, rc);
1666
1667         rc = dt_xattr_set(env, child, buf, XATTR_NAME_FID, 0, handle,
1668                           BYPASS_CAPA);
1669
1670         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1671
1672 stop:
1673         dt_trans_stop(env, cdev, handle);
1674
1675 out:
1676         lu_object_put(env, &child->do_lu);
1677
1678         return rc;
1679 }
1680
1681 /**
1682  * This function will create the MDT-object with the given (partial) LOV EA.
1683  *
1684  * Under some data corruption cases, the MDT-object of the file may be lost,
1685  * but its OST-objects, or some of them are there. The layout LFSCK needs to
1686  * re-create the MDT-object with the orphan OST-object(s) information.
1687  *
1688  * On the other hand, the LFSCK may has created some OST-object for repairing
1689  * dangling LOV EA reference, but as the LFSCK processing, it may find that
1690  * the old OST-object is there and should replace the former new created OST
1691  * object. Unfortunately, some others have modified such newly created object.
1692  * To keep the data (both new and old), the LFSCK will create MDT-object with
1693  * new FID to reference the original OST-object.
1694  *
1695  * \param[in] env       pointer to the thread context
1696  * \param[in] com       pointer to the lfsck component
1697  * \param[in] ltd       pointer to target device descriptor
1698  * \param[in] rec       pointer to the record for the orphan OST-object
1699  * \param[in] cfid      pointer to FID for the orphan OST-object
1700  * \param[in] infix     additional information, such as the FID for original
1701  *                      MDT-object and the stripe offset in the LOV EA
1702  * \param[in] type      the type for describing why the orphan MDT-object is
1703  *                      created. The rules are as following:
1704  *
1705  *  type "C":           Multiple OST-objects claim the same MDT-object and the
1706  *                      same slot in the layout EA. Then the LFSCK will create
1707  *                      new MDT-object(s) to hold the conflict OST-object(s).
1708  *
1709  *  type "N":           The orphan OST-object does not know which one was the
1710  *                      real parent MDT-object, so the LFSCK uses new FID for
1711  *                      its parent MDT-object.
1712  *
1713  *  type "R":           The orphan OST-object knows its parent MDT-object FID,
1714  *                      but does not know the position (the file name) in the
1715  *                      layout.
1716  *
1717  *  type "D":           The MDT-object is a directory, it may knows its parent
1718  *                      but because there is no valid linkEA, the LFSCK cannot
1719  *                      know where to put it back to the namespace.
1720  *  type "O":           The MDT-object has no linkEA, and there is no name
1721  *                      entry that references the MDT-object.
1722  *
1723  *  type "P":           The orphan object to be created was a parent directory
1724  *                      of some MDT-object which linkEA shows that the @orphan
1725  *                      object is missing.
1726  *
1727  * The orphan name will be like:
1728  * ${FID}-${infix}-${type}-${conflict_version}
1729  *
1730  * \param[in] ea_off    the stripe offset in the LOV EA
1731  *
1732  * \retval              positive on repaired something
1733  * \retval              0 if needs to repair nothing
1734  * \retval              negative error number on failure
1735  */
1736 static int lfsck_layout_recreate_parent(const struct lu_env *env,
1737                                         struct lfsck_component *com,
1738                                         struct lfsck_tgt_desc *ltd,
1739                                         struct lu_orphan_rec *rec,
1740                                         struct lu_fid *cfid,
1741                                         const char *infix,
1742                                         const char *type,
1743                                         __u32 ea_off)
1744 {
1745         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1746         struct dt_insert_rec            *dtrec  = &info->lti_dt_rec;
1747         char                            *name   = info->lti_key;
1748         struct lu_attr                  *la     = &info->lti_la;
1749         struct dt_object_format         *dof    = &info->lti_dof;
1750         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1751         struct lu_fid                   *pfid   = &rec->lor_fid;
1752         struct lu_fid                   *tfid   = &info->lti_fid3;
1753         struct dt_device                *next   = lfsck->li_next;
1754         struct dt_object                *pobj   = NULL;
1755         struct dt_object                *cobj   = NULL;
1756         struct thandle                  *th     = NULL;
1757         struct lu_buf                    pbuf   = { NULL };
1758         struct lu_buf                   *ea_buf = &info->lti_big_buf;
1759         struct lu_buf                    lov_buf;
1760         struct lustre_handle             lh     = { 0 };
1761         struct linkea_data               ldata  = { NULL };
1762         struct lu_buf                    linkea_buf;
1763         const struct lu_name            *pname;
1764         int                              size   = 0;
1765         int                              idx    = 0;
1766         int                              rc     = 0;
1767         ENTRY;
1768
1769         if (unlikely(lfsck->li_lpf_obj == NULL))
1770                 GOTO(log, rc = -ENXIO);
1771
1772         if (fid_is_zero(pfid)) {
1773                 struct filter_fid *ff = &info->lti_new_pfid;
1774
1775                 rc = lfsck_fid_alloc(env, lfsck, pfid, false);
1776                 if (rc != 0)
1777                         RETURN(rc);
1778
1779                 ff->ff_parent.f_seq = cpu_to_le64(pfid->f_seq);
1780                 ff->ff_parent.f_oid = cpu_to_le32(pfid->f_oid);
1781                 /* Currently, the filter_fid::ff_parent::f_ver is not the
1782                  * real parent MDT-object's FID::f_ver, instead it is the
1783                  * OST-object index in its parent MDT-object's layout EA. */
1784                 ff->ff_parent.f_stripe_idx = cpu_to_le32(ea_off);
1785                 lfsck_buf_init(&pbuf, ff, sizeof(struct filter_fid));
1786                 cobj = lfsck_object_find_by_dev(env, ltd->ltd_tgt, cfid);
1787                 if (IS_ERR(cobj))
1788                         GOTO(log, rc = PTR_ERR(cobj));
1789         }
1790
1791         pobj = lfsck_object_find_by_dev(env, lfsck->li_bottom, pfid);
1792         if (IS_ERR(pobj))
1793                 GOTO(put, rc = PTR_ERR(pobj));
1794
1795         LASSERT(infix != NULL);
1796         LASSERT(type != NULL);
1797
1798         do {
1799                 snprintf(name, NAME_MAX, DFID"%s-%s-%d", PFID(pfid), infix,
1800                          type, idx++);
1801                 rc = dt_lookup(env, lfsck->li_lpf_obj, (struct dt_rec *)tfid,
1802                                (const struct dt_key *)name, BYPASS_CAPA);
1803                 if (rc != 0 && rc != -ENOENT)
1804                         GOTO(put, rc);
1805         } while (rc == 0);
1806
1807         rc = linkea_data_new(&ldata,
1808                              &lfsck_env_info(env)->lti_linkea_buf);
1809         if (rc != 0)
1810                 GOTO(put, rc);
1811
1812         pname = lfsck_name_get_const(env, name, strlen(name));
1813         rc = linkea_add_buf(&ldata, pname, lfsck_dto2fid(lfsck->li_lpf_obj));
1814         if (rc != 0)
1815                 GOTO(put, rc);
1816
1817         memset(la, 0, sizeof(*la));
1818         la->la_uid = rec->lor_uid;
1819         la->la_gid = rec->lor_gid;
1820         la->la_mode = S_IFREG | S_IRUSR;
1821         la->la_valid = LA_MODE | LA_UID | LA_GID;
1822
1823         memset(dof, 0, sizeof(*dof));
1824         dof->dof_type = dt_mode_to_dft(S_IFREG);
1825
1826         size = lov_mds_md_size(ea_off + 1, LOV_MAGIC_V1);
1827         if (ea_buf->lb_len < size) {
1828                 lu_buf_realloc(ea_buf, size);
1829                 if (ea_buf->lb_buf == NULL)
1830                         GOTO(put, rc = -ENOMEM);
1831         }
1832
1833         /* Hold update lock on the .lustre/lost+found/MDTxxxx/.
1834          *
1835          * XXX: Currently, we do not grab the PDO lock as normal create cases,
1836          *      because creating MDT-object for orphan OST-object is rare, we
1837          *      do not much care about the performance. It can be improved in
1838          *      the future when needed. */
1839         rc = lfsck_ibits_lock(env, lfsck, lfsck->li_lpf_obj, &lh,
1840                               MDS_INODELOCK_UPDATE, LCK_EX);
1841         if (rc != 0)
1842                 GOTO(put, rc);
1843
1844         th = dt_trans_create(env, next);
1845         if (IS_ERR(th))
1846                 GOTO(unlock, rc = PTR_ERR(th));
1847
1848         /* 1a. Update OST-object's parent information remotely.
1849          *
1850          * If other subsequent modifications failed, then next LFSCK scanning
1851          * will process the OST-object as orphan again with known parent FID. */
1852         if (cobj != NULL) {
1853                 rc = dt_declare_xattr_set(env, cobj, &pbuf, XATTR_NAME_FID,
1854                                           0, th);
1855                 if (rc != 0)
1856                         GOTO(stop, rc);
1857         }
1858
1859         /* 2a. Create the MDT-object locally. */
1860         rc = dt_declare_create(env, pobj, la, NULL, dof, th);
1861         if (rc != 0)
1862                 GOTO(stop, rc);
1863
1864         /* 3a. Add layout EA for the MDT-object. */
1865         lfsck_buf_init(&lov_buf, ea_buf->lb_buf, size);
1866         rc = dt_declare_xattr_set(env, pobj, &lov_buf, XATTR_NAME_LOV,
1867                                   LU_XATTR_CREATE, th);
1868         if (rc != 0)
1869                 GOTO(stop, rc);
1870
1871         /* 4a. Insert the MDT-object to .lustre/lost+found/MDTxxxx/ */
1872         dtrec->rec_fid = pfid;
1873         dtrec->rec_type = S_IFREG;
1874         rc = dt_declare_insert(env, lfsck->li_lpf_obj,
1875                                (const struct dt_rec *)dtrec,
1876                                (const struct dt_key *)name, th);
1877         if (rc != 0)
1878                 GOTO(stop, rc);
1879
1880         /* 5a. insert linkEA for parent. */
1881         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
1882                        ldata.ld_leh->leh_len);
1883         rc = dt_declare_xattr_set(env, pobj, &linkea_buf,
1884                                   XATTR_NAME_LINK, 0, th);
1885         if (rc != 0)
1886                 GOTO(stop, rc);
1887
1888         rc = dt_trans_start(env, next, th);
1889         if (rc != 0)
1890                 GOTO(stop, rc);
1891
1892         /* 1b. Update OST-object's parent information remotely. */
1893         if (cobj != NULL) {
1894                 rc = dt_xattr_set(env, cobj, &pbuf, XATTR_NAME_FID, 0, th,
1895                                   BYPASS_CAPA);
1896                 if (rc != 0)
1897                         GOTO(stop, rc);
1898         }
1899
1900         dt_write_lock(env, pobj, 0);
1901         /* 2b. Create the MDT-object locally. */
1902         rc = dt_create(env, pobj, la, NULL, dof, th);
1903         if (rc == 0)
1904                 /* 3b. Add layout EA for the MDT-object. */
1905                 rc = lfsck_layout_extend_lovea(env, lfsck, th, pobj, cfid,
1906                                                &lov_buf, LU_XATTR_CREATE,
1907                                                ltd->ltd_index, ea_off, false);
1908         dt_write_unlock(env, pobj);
1909         if (rc < 0)
1910                 GOTO(stop, rc);
1911
1912         /* 4b. Insert the MDT-object to .lustre/lost+found/MDTxxxx/ */
1913         rc = dt_insert(env, lfsck->li_lpf_obj, (const struct dt_rec *)dtrec,
1914                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
1915         if (rc != 0)
1916                 GOTO(stop, rc);
1917
1918         /* 5b. insert linkEA for parent. */
1919         rc = dt_xattr_set(env, pobj, &linkea_buf,
1920                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
1921
1922         GOTO(stop, rc);
1923
1924 stop:
1925         dt_trans_stop(env, next, th);
1926
1927 unlock:
1928         lfsck_ibits_unlock(&lh, LCK_EX);
1929
1930 put:
1931         if (cobj != NULL && !IS_ERR(cobj))
1932                 lu_object_put(env, &cobj->do_lu);
1933         if (pobj != NULL && !IS_ERR(pobj))
1934                 lu_object_put(env, &pobj->do_lu);
1935
1936 log:
1937         if (rc < 0)
1938                 CDEBUG(D_LFSCK, "%s layout LFSCK assistant failed to "
1939                        "recreate the lost MDT-object: parent "DFID
1940                        ", child "DFID", OST-index %u, stripe-index %u, "
1941                        "infix %s, type %s: rc = %d\n",
1942                        lfsck_lfsck2name(lfsck), PFID(pfid), PFID(cfid),
1943                        ltd->ltd_index, ea_off, infix, type, rc);
1944
1945         return rc >= 0 ? 1 : rc;
1946 }
1947
1948 static int lfsck_layout_master_conditional_destroy(const struct lu_env *env,
1949                                                    struct lfsck_component *com,
1950                                                    const struct lu_fid *fid,
1951                                                    __u32 index)
1952 {
1953         struct lfsck_thread_info *info  = lfsck_env_info(env);
1954         struct lfsck_request     *lr    = &info->lti_lr;
1955         struct lfsck_instance    *lfsck = com->lc_lfsck;
1956         struct lfsck_tgt_desc    *ltd;
1957         struct ptlrpc_request    *req;
1958         struct lfsck_request     *tmp;
1959         struct obd_export        *exp;
1960         int                       rc    = 0;
1961         ENTRY;
1962
1963         ltd = lfsck_tgt_get(&lfsck->li_ost_descs, index);
1964         if (unlikely(ltd == NULL))
1965                 RETURN(-ENXIO);
1966
1967         exp = ltd->ltd_exp;
1968         if (!(exp_connect_flags(exp) & OBD_CONNECT_LFSCK))
1969                 GOTO(put, rc = -EOPNOTSUPP);
1970
1971         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LFSCK_NOTIFY);
1972         if (req == NULL)
1973                 GOTO(put, rc = -ENOMEM);
1974
1975         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_NOTIFY);
1976         if (rc != 0) {
1977                 ptlrpc_request_free(req);
1978
1979                 GOTO(put, rc);
1980         }
1981
1982         memset(lr, 0, sizeof(*lr));
1983         lr->lr_event = LE_CONDITIONAL_DESTROY;
1984         lr->lr_active = LFSCK_TYPE_LAYOUT;
1985         lr->lr_fid = *fid;
1986
1987         tmp = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
1988         *tmp = *lr;
1989         ptlrpc_request_set_replen(req);
1990
1991         rc = ptlrpc_queue_wait(req);
1992         ptlrpc_req_finished(req);
1993
1994         GOTO(put, rc);
1995
1996 put:
1997         lfsck_tgt_put(ltd);
1998
1999         return rc;
2000 }
2001
2002 static int lfsck_layout_slave_conditional_destroy(const struct lu_env *env,
2003                                                   struct lfsck_component *com,
2004                                                   struct lfsck_request *lr)
2005 {
2006         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2007         struct lu_attr                  *la     = &info->lti_la;
2008         ldlm_policy_data_t              *policy = &info->lti_policy;
2009         struct ldlm_res_id              *resid  = &info->lti_resid;
2010         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2011         struct dt_device                *dev    = lfsck->li_bottom;
2012         struct lu_fid                   *fid    = &lr->lr_fid;
2013         struct dt_object                *obj;
2014         struct thandle                  *th     = NULL;
2015         struct lustre_handle             lh     = { 0 };
2016         __u64                            flags  = 0;
2017         int                              rc     = 0;
2018         ENTRY;
2019
2020         obj = lfsck_object_find_by_dev(env, dev, fid);
2021         if (IS_ERR(obj))
2022                 RETURN(PTR_ERR(obj));
2023
2024         dt_read_lock(env, obj, 0);
2025         if (dt_object_exists(obj) == 0 ||
2026             lfsck_is_dead_obj(obj)) {
2027                 dt_read_unlock(env, obj);
2028
2029                 GOTO(put, rc = -ENOENT);
2030         }
2031
2032         /* Get obj's attr without lock firstly. */
2033         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
2034         dt_read_unlock(env, obj);
2035         if (rc != 0)
2036                 GOTO(put, rc);
2037
2038         if (likely(la->la_ctime != 0 || la->la_mode & S_ISUID))
2039                 GOTO(put, rc = -ETXTBSY);
2040
2041         /* Acquire extent lock on [0, EOF] to sync with all possible written. */
2042         LASSERT(lfsck->li_namespace != NULL);
2043
2044         memset(policy, 0, sizeof(*policy));
2045         policy->l_extent.end = OBD_OBJECT_EOF;
2046         ost_fid_build_resid(fid, resid);
2047         rc = ldlm_cli_enqueue_local(lfsck->li_namespace, resid, LDLM_EXTENT,
2048                                     policy, LCK_EX, &flags, ldlm_blocking_ast,
2049                                     ldlm_completion_ast, NULL, NULL, 0,
2050                                     LVB_T_NONE, NULL, &lh);
2051         if (rc != ELDLM_OK)
2052                 GOTO(put, rc = -EIO);
2053
2054         dt_write_lock(env, obj, 0);
2055         /* Get obj's attr within lock again. */
2056         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
2057         if (rc != 0)
2058                 GOTO(unlock, rc);
2059
2060         if (la->la_ctime != 0)
2061                 GOTO(unlock, rc = -ETXTBSY);
2062
2063         th = dt_trans_create(env, dev);
2064         if (IS_ERR(th))
2065                 GOTO(unlock, rc = PTR_ERR(th));
2066
2067         rc = dt_declare_ref_del(env, obj, th);
2068         if (rc != 0)
2069                 GOTO(stop, rc);
2070
2071         rc = dt_declare_destroy(env, obj, th);
2072         if (rc != 0)
2073                 GOTO(stop, rc);
2074
2075         rc = dt_trans_start_local(env, dev, th);
2076         if (rc != 0)
2077                 GOTO(stop, rc);
2078
2079         rc = dt_ref_del(env, obj, th);
2080         if (rc != 0)
2081                 GOTO(stop, rc);
2082
2083         rc = dt_destroy(env, obj, th);
2084         if (rc == 0)
2085                 CDEBUG(D_LFSCK, "%s: layout LFSCK destroyed the empty "
2086                        "OST-object "DFID" that was created for reparing "
2087                        "dangling referenced case. But the original missing "
2088                        "OST-object is found now.\n",
2089                        lfsck_lfsck2name(lfsck), PFID(fid));
2090
2091         GOTO(stop, rc);
2092
2093 stop:
2094         dt_trans_stop(env, dev, th);
2095
2096 unlock:
2097         dt_write_unlock(env, obj);
2098         ldlm_lock_decref(&lh, LCK_EX);
2099
2100 put:
2101         lu_object_put(env, &obj->do_lu);
2102
2103         return rc;
2104 }
2105
2106 /**
2107  * Some OST-object has occupied the specified layout EA slot.
2108  * Such OST-object may be generated by the LFSCK when repair
2109  * dangling referenced MDT-object, which can be indicated by
2110  * attr::la_ctime == 0 but without S_ISUID in la_mode. If it
2111  * is true and such OST-object has not been modified yet, we
2112  * will replace it with the orphan OST-object; otherwise the
2113  * LFSCK will create new MDT-object to reference the orphan.
2114  *
2115  * \retval       +1: repaired
2116  * \retval        0: did nothing
2117  * \retval      -ve: on error
2118  */
2119 static int lfsck_layout_conflict_create(const struct lu_env *env,
2120                                         struct lfsck_component *com,
2121                                         struct lfsck_tgt_desc *ltd,
2122                                         struct lu_orphan_rec *rec,
2123                                         struct dt_object *parent,
2124                                         struct lu_fid *cfid,
2125                                         struct lu_buf *ea_buf,
2126                                         struct lov_ost_data_v1 *slot,
2127                                         __u32 ea_off)
2128 {
2129         struct lfsck_thread_info *info          = lfsck_env_info(env);
2130         struct lu_fid            *cfid2         = &info->lti_fid2;
2131         struct ost_id            *oi            = &info->lti_oi;
2132         struct lov_mds_md_v1     *lmm           = ea_buf->lb_buf;
2133         struct dt_device         *dev           = com->lc_lfsck->li_bottom;
2134         struct thandle           *th            = NULL;
2135         struct lustre_handle      lh            = { 0 };
2136         __u32                     ost_idx2      = le32_to_cpu(slot->l_ost_idx);
2137         int                       rc            = 0;
2138         ENTRY;
2139
2140         ostid_le_to_cpu(&slot->l_ost_oi, oi);
2141         rc = ostid_to_fid(cfid2, oi, ost_idx2);
2142         if (rc != 0)
2143                 GOTO(out, rc);
2144
2145         /* Hold layout lock on the parent to prevent others to access. */
2146         rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
2147                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2148                               LCK_EX);
2149         if (rc != 0)
2150                 GOTO(out, rc);
2151
2152         rc = lfsck_layout_master_conditional_destroy(env, com, cfid2, ost_idx2);
2153
2154         /* If the conflict OST-obejct is not created for fixing dangling
2155          * referenced MDT-object in former LFSCK check/repair, or it has
2156          * been modified by others, then we cannot destroy it. Re-create
2157          * a new MDT-object for the orphan OST-object. */
2158         if (rc == -ETXTBSY) {
2159                 /* No need the layout lock on the original parent. */
2160                 lfsck_ibits_unlock(&lh, LCK_EX);
2161
2162                 fid_zero(&rec->lor_fid);
2163                 snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2164                          "-"DFID"-%x", PFID(lu_object_fid(&parent->do_lu)),
2165                          ea_off);
2166                 rc = lfsck_layout_recreate_parent(env, com, ltd, rec, cfid,
2167                                                 info->lti_tmpbuf, "C", ea_off);
2168
2169                 RETURN(rc);
2170         }
2171
2172         if (rc != 0 && rc != -ENOENT)
2173                 GOTO(unlock, rc);
2174
2175         th = dt_trans_create(env, dev);
2176         if (IS_ERR(th))
2177                 GOTO(unlock, rc = PTR_ERR(th));
2178
2179         rc = dt_declare_xattr_set(env, parent, ea_buf, XATTR_NAME_LOV,
2180                                   LU_XATTR_REPLACE, th);
2181         if (rc != 0)
2182                 GOTO(stop, rc);
2183
2184         rc = dt_trans_start_local(env, dev, th);
2185         if (rc != 0)
2186                 GOTO(stop, rc);
2187
2188         dt_write_lock(env, parent, 0);
2189         lmm->lmm_layout_gen = cpu_to_le16(le16_to_cpu(lmm->lmm_layout_gen) + 1);
2190         rc = lfsck_layout_refill_lovea(env, th, parent, cfid, ea_buf, slot,
2191                                        LU_XATTR_REPLACE, ltd->ltd_index);
2192         dt_write_unlock(env, parent);
2193
2194         GOTO(stop, rc);
2195
2196 stop:
2197         dt_trans_stop(env, dev, th);
2198
2199 unlock:
2200         lfsck_ibits_unlock(&lh, LCK_EX);
2201
2202 out:
2203         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant replaced the conflict "
2204                "OST-object "DFID" on the OST %x with the orphan "DFID" on "
2205                "the OST %x: parent "DFID", stripe-index %u: rc = %d\n",
2206                lfsck_lfsck2name(com->lc_lfsck), PFID(cfid2), ost_idx2,
2207                PFID(cfid), ltd->ltd_index, PFID(lfsck_dto2fid(parent)),
2208                ea_off, rc);
2209
2210         return rc >= 0 ? 1 : rc;
2211 }
2212
2213 /**
2214  * \retval       +1: repaired
2215  * \retval        0: did nothing
2216  * \retval      -ve: on error
2217  */
2218 static int lfsck_layout_recreate_lovea(const struct lu_env *env,
2219                                        struct lfsck_component *com,
2220                                        struct lfsck_tgt_desc *ltd,
2221                                        struct lu_orphan_rec *rec,
2222                                        struct dt_object *parent,
2223                                        struct lu_fid *cfid,
2224                                        __u32 ost_idx, __u32 ea_off)
2225 {
2226         struct lfsck_thread_info *info          = lfsck_env_info(env);
2227         struct lu_buf            *buf           = &info->lti_big_buf;
2228         struct lu_fid            *fid           = &info->lti_fid2;
2229         struct ost_id            *oi            = &info->lti_oi;
2230         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2231         struct dt_device         *dt            = lfsck->li_bottom;
2232         struct lfsck_bookmark    *bk            = &lfsck->li_bookmark_ram;
2233         struct thandle            *handle       = NULL;
2234         size_t                    lovea_size;
2235         struct lov_mds_md_v1     *lmm;
2236         struct lov_ost_data_v1   *objs;
2237         struct lustre_handle      lh            = { 0 };
2238         __u32                     magic;
2239         int                       fl            = 0;
2240         int                       rc            = 0;
2241         int                       rc1;
2242         int                       i;
2243         __u16                     count;
2244         bool                      locked        = false;
2245         ENTRY;
2246
2247         rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
2248                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2249                               LCK_EX);
2250         if (rc != 0) {
2251                 CDEBUG(D_LFSCK, "%s: layout LFSCK assistant failed to recreate "
2252                        "LOV EA for "DFID": parent "DFID", OST-index %u, "
2253                        "stripe-index %u: rc = %d\n",
2254                        lfsck_lfsck2name(lfsck), PFID(cfid),
2255                        PFID(lfsck_dto2fid(parent)), ost_idx, ea_off, rc);
2256
2257                 RETURN(rc);
2258         }
2259
2260 again:
2261         if (locked) {
2262                 dt_write_unlock(env, parent);
2263                 locked = false;
2264         }
2265
2266         if (handle != NULL) {
2267                 dt_trans_stop(env, dt, handle);
2268                 handle = NULL;
2269         }
2270
2271         if (rc < 0)
2272                 GOTO(unlock_layout, rc);
2273
2274         lovea_size = rc;
2275         if (buf->lb_len < lovea_size) {
2276                 lu_buf_realloc(buf, lovea_size);
2277                 if (buf->lb_buf == NULL)
2278                         GOTO(unlock_layout, rc = -ENOMEM);
2279         }
2280
2281         if (!(bk->lb_param & LPF_DRYRUN)) {
2282                 handle = dt_trans_create(env, dt);
2283                 if (IS_ERR(handle))
2284                         GOTO(unlock_layout, rc = PTR_ERR(handle));
2285
2286                 rc = dt_declare_xattr_set(env, parent, buf, XATTR_NAME_LOV,
2287                                           fl, handle);
2288                 if (rc != 0)
2289                         GOTO(stop, rc);
2290
2291                 rc = dt_trans_start_local(env, dt, handle);
2292                 if (rc != 0)
2293                         GOTO(stop, rc);
2294         }
2295
2296         dt_write_lock(env, parent, 0);
2297         locked = true;
2298         rc = dt_xattr_get(env, parent, buf, XATTR_NAME_LOV, BYPASS_CAPA);
2299         if (rc == -ERANGE) {
2300                 rc = dt_xattr_get(env, parent, &LU_BUF_NULL, XATTR_NAME_LOV,
2301                                   BYPASS_CAPA);
2302                 LASSERT(rc != 0);
2303                 goto again;
2304         } else if (rc == -ENODATA || rc == 0) {
2305                 lovea_size = lov_mds_md_size(ea_off + 1, LOV_MAGIC_V1);
2306                 /* If the declared is not big enough, re-try. */
2307                 if (buf->lb_len < lovea_size) {
2308                         rc = lovea_size;
2309                         goto again;
2310                 }
2311                 fl = LU_XATTR_CREATE;
2312         } else if (rc < 0) {
2313                 GOTO(unlock_parent, rc);
2314         } else if (unlikely(buf->lb_len == 0)) {
2315                 goto again;
2316         } else {
2317                 fl = LU_XATTR_REPLACE;
2318                 lovea_size = rc;
2319         }
2320
2321         if (fl == LU_XATTR_CREATE) {
2322                 if (bk->lb_param & LPF_DRYRUN)
2323                         GOTO(unlock_parent, rc = 1);
2324
2325                 LASSERT(buf->lb_len >= lovea_size);
2326
2327                 rc = lfsck_layout_extend_lovea(env, lfsck, handle, parent, cfid,
2328                                                buf, fl, ost_idx, ea_off, false);
2329
2330                 GOTO(unlock_parent, rc);
2331         }
2332
2333         lmm = buf->lb_buf;
2334         rc1 = lfsck_layout_verify_header(lmm);
2335
2336         /* If the LOV EA crashed, the rebuild it. */
2337         if (rc1 == -EINVAL) {
2338                 if (bk->lb_param & LPF_DRYRUN)
2339                         GOTO(unlock_parent, rc = 1);
2340
2341                 LASSERT(buf->lb_len >= lovea_size);
2342
2343                 rc = lfsck_layout_extend_lovea(env, lfsck, handle, parent, cfid,
2344                                                buf, fl, ost_idx, ea_off, true);
2345
2346                 GOTO(unlock_parent, rc);
2347         }
2348
2349         /* For other unknown magic/pattern, keep the current LOV EA. */
2350         if (rc1 != 0)
2351                 GOTO(unlock_parent, rc = rc1);
2352
2353         /* Currently, we only support LOV_MAGIC_V1/LOV_MAGIC_V3 which has
2354          * been verified in lfsck_layout_verify_header() already. If some
2355          * new magic introduced in the future, then layout LFSCK needs to
2356          * be updated also. */
2357         magic = le32_to_cpu(lmm->lmm_magic);
2358         if (magic == LOV_MAGIC_V1) {
2359                 objs = &lmm->lmm_objects[0];
2360         } else {
2361                 LASSERT(magic == LOV_MAGIC_V3);
2362                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
2363         }
2364
2365         count = le16_to_cpu(lmm->lmm_stripe_count);
2366         if (count == 0)
2367                 GOTO(unlock_parent, rc = -EINVAL);
2368         LASSERT(count > 0);
2369
2370         /* Exceed the current end of MDT-object layout EA. Then extend it. */
2371         if (count <= ea_off) {
2372                 if (bk->lb_param & LPF_DRYRUN)
2373                         GOTO(unlock_parent, rc = 1);
2374
2375                 lovea_size = lov_mds_md_size(ea_off + 1, magic);
2376                 /* If the declared is not big enough, re-try. */
2377                 if (buf->lb_len < lovea_size) {
2378                         rc = lovea_size;
2379                         goto again;
2380                 }
2381
2382                 rc = lfsck_layout_extend_lovea(env, lfsck, handle, parent, cfid,
2383                                                buf, fl, ost_idx, ea_off, false);
2384
2385                 GOTO(unlock_parent, rc);
2386         }
2387
2388         LASSERTF(rc > 0, "invalid rc = %d\n", rc);
2389
2390         for (i = 0; i < count; i++, objs++) {
2391                 /* The MDT-object was created via lfsck_layout_recover_create()
2392                  * by others before, and we fill the dummy layout EA. */
2393                 if (lovea_slot_is_dummy(objs)) {
2394                         if (i != ea_off)
2395                                 continue;
2396
2397                         if (bk->lb_param & LPF_DRYRUN)
2398                                 GOTO(unlock_parent, rc = 1);
2399
2400                         lmm->lmm_layout_gen =
2401                             cpu_to_le16(le16_to_cpu(lmm->lmm_layout_gen) + 1);
2402                         rc = lfsck_layout_refill_lovea(env, handle, parent,
2403                                                        cfid, buf, objs, fl,
2404                                                        ost_idx);
2405
2406                         CDEBUG(D_LFSCK, "%s layout LFSCK assistant fill "
2407                                "dummy layout slot for "DFID": parent "DFID
2408                                ", OST-index %u, stripe-index %u: rc = %d\n",
2409                                lfsck_lfsck2name(lfsck), PFID(cfid),
2410                                PFID(lfsck_dto2fid(parent)), ost_idx, i, rc);
2411
2412                         GOTO(unlock_parent, rc);
2413                 }
2414
2415                 ostid_le_to_cpu(&objs->l_ost_oi, oi);
2416                 rc = ostid_to_fid(fid, oi, le32_to_cpu(objs->l_ost_idx));
2417                 if (rc != 0) {
2418                         CDEBUG(D_LFSCK, "%s: the parent "DFID" contains "
2419                                "invalid layout EA at the slot %d, index %u\n",
2420                                lfsck_lfsck2name(lfsck),
2421                                PFID(lfsck_dto2fid(parent)), i,
2422                                le32_to_cpu(objs->l_ost_idx));
2423
2424                         GOTO(unlock_parent, rc);
2425                 }
2426
2427                 /* It should be rare case, the slot is there, but the LFSCK
2428                  * does not handle it during the first-phase cycle scanning. */
2429                 if (unlikely(lu_fid_eq(fid, cfid))) {
2430                         if (i == ea_off) {
2431                                 GOTO(unlock_parent, rc = 0);
2432                         } else {
2433                                 /* Rare case that the OST-object index
2434                                  * does not match the parent MDT-object
2435                                  * layout EA. We trust the later one. */
2436                                 if (bk->lb_param & LPF_DRYRUN)
2437                                         GOTO(unlock_parent, rc = 1);
2438
2439                                 dt_write_unlock(env, parent);
2440                                 if (handle != NULL)
2441                                         dt_trans_stop(env, dt, handle);
2442                                 lfsck_ibits_unlock(&lh, LCK_EX);
2443                                 rc = lfsck_layout_update_pfid(env, com, parent,
2444                                                         cfid, ltd->ltd_tgt, i);
2445
2446                                 CDEBUG(D_LFSCK, "%s layout LFSCK assistant "
2447                                        "updated OST-object's pfid for "DFID
2448                                        ": parent "DFID", OST-index %u, "
2449                                        "stripe-index %u: rc = %d\n",
2450                                        lfsck_lfsck2name(lfsck), PFID(cfid),
2451                                        PFID(lfsck_dto2fid(parent)),
2452                                        ltd->ltd_index, i, rc);
2453
2454                                 RETURN(rc);
2455                         }
2456                 }
2457         }
2458
2459         /* The MDT-object exists, but related layout EA slot is occupied
2460          * by others. */
2461         if (bk->lb_param & LPF_DRYRUN)
2462                 GOTO(unlock_parent, rc = 1);
2463
2464         dt_write_unlock(env, parent);
2465         if (handle != NULL)
2466                 dt_trans_stop(env, dt, handle);
2467         lfsck_ibits_unlock(&lh, LCK_EX);
2468         if (le32_to_cpu(lmm->lmm_magic) == LOV_MAGIC_V1)
2469                 objs = &lmm->lmm_objects[ea_off];
2470         else
2471                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[ea_off];
2472         rc = lfsck_layout_conflict_create(env, com, ltd, rec, parent, cfid,
2473                                           buf, objs, ea_off);
2474
2475         RETURN(rc);
2476
2477 unlock_parent:
2478         if (locked)
2479                 dt_write_unlock(env, parent);
2480
2481 stop:
2482         if (handle != NULL)
2483                 dt_trans_stop(env, dt, handle);
2484
2485 unlock_layout:
2486         lfsck_ibits_unlock(&lh, LCK_EX);
2487
2488         return rc;
2489 }
2490
2491 static int lfsck_layout_scan_orphan_one(const struct lu_env *env,
2492                                         struct lfsck_component *com,
2493                                         struct lfsck_tgt_desc *ltd,
2494                                         struct lu_orphan_rec *rec,
2495                                         struct lu_fid *cfid)
2496 {
2497         struct lfsck_layout     *lo     = com->lc_file_ram;
2498         struct lu_fid           *pfid   = &rec->lor_fid;
2499         struct dt_object        *parent = NULL;
2500         __u32                    ea_off = pfid->f_stripe_idx;
2501         int                      rc     = 0;
2502         ENTRY;
2503
2504         if (!fid_is_sane(cfid))
2505                 GOTO(out, rc = -EINVAL);
2506
2507         if (fid_is_zero(pfid)) {
2508                 rc = lfsck_layout_recreate_parent(env, com, ltd, rec, cfid,
2509                                                   "", "N", ea_off);
2510                 GOTO(out, rc);
2511         }
2512
2513         pfid->f_ver = 0;
2514         if (!fid_is_sane(pfid))
2515                 GOTO(out, rc = -EINVAL);
2516
2517         parent = lfsck_object_find_by_dev(env, com->lc_lfsck->li_bottom, pfid);
2518         if (IS_ERR(parent))
2519                 GOTO(out, rc = PTR_ERR(parent));
2520
2521         if (unlikely(dt_object_remote(parent) != 0))
2522                 GOTO(put, rc = -EXDEV);
2523
2524         if (dt_object_exists(parent) == 0) {
2525                 lu_object_put(env, &parent->do_lu);
2526                 rc = lfsck_layout_recreate_parent(env, com, ltd, rec, cfid,
2527                                                   "", "R", ea_off);
2528                 GOTO(out, rc);
2529         }
2530
2531         if (!S_ISREG(lu_object_attr(&parent->do_lu)))
2532                 GOTO(put, rc = -EISDIR);
2533
2534         rc = lfsck_layout_recreate_lovea(env, com, ltd, rec, parent, cfid,
2535                                          ltd->ltd_index, ea_off);
2536
2537         GOTO(put, rc);
2538
2539 put:
2540         if (rc <= 0)
2541                 lu_object_put(env, &parent->do_lu);
2542         else
2543                 /* The layout EA is changed, need to be reloaded next time. */
2544                 lu_object_put_nocache(env, &parent->do_lu);
2545
2546 out:
2547         down_write(&com->lc_sem);
2548         com->lc_new_scanned++;
2549         com->lc_new_checked++;
2550         if (rc > 0) {
2551                 lo->ll_objs_repaired[LLIT_ORPHAN - 1]++;
2552                 rc = 0;
2553         } else if (rc < 0) {
2554                 lo->ll_objs_failed_phase2++;
2555         }
2556         up_write(&com->lc_sem);
2557
2558         return rc;
2559 }
2560
2561 static int lfsck_layout_scan_orphan(const struct lu_env *env,
2562                                     struct lfsck_component *com,
2563                                     struct lfsck_tgt_desc *ltd)
2564 {
2565         struct lfsck_assistant_data     *lad    = com->lc_data;
2566         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2567         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
2568         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2569         struct ost_id                   *oi     = &info->lti_oi;
2570         struct lu_fid                   *fid    = &info->lti_fid;
2571         struct dt_object                *obj;
2572         const struct dt_it_ops          *iops;
2573         struct dt_it                    *di;
2574         int                              rc     = 0;
2575         ENTRY;
2576
2577         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant starts the orphan "
2578                "scanning for OST%04x\n",
2579                lfsck_lfsck2name(lfsck), ltd->ltd_index);
2580
2581         if (cfs_bitmap_check(lad->lad_bitmap, ltd->ltd_index)) {
2582                 CDEBUG(D_LFSCK, "%s: layout LFSCK assistant skip the orphan "
2583                        "scanning for OST%04x\n",
2584                        lfsck_lfsck2name(lfsck), ltd->ltd_index);
2585
2586                 RETURN(0);
2587         }
2588
2589         ostid_set_seq(oi, FID_SEQ_IDIF);
2590         ostid_set_id(oi, 0);
2591         rc = ostid_to_fid(fid, oi, ltd->ltd_index);
2592         if (rc != 0)
2593                 GOTO(log, rc);
2594
2595         obj = lfsck_object_find_by_dev(env, ltd->ltd_tgt, fid);
2596         if (unlikely(IS_ERR(obj)))
2597                 GOTO(log, rc = PTR_ERR(obj));
2598
2599         rc = obj->do_ops->do_index_try(env, obj, &dt_lfsck_orphan_features);
2600         if (rc != 0)
2601                 GOTO(put, rc);
2602
2603         iops = &obj->do_index_ops->dio_it;
2604         di = iops->init(env, obj, 0, BYPASS_CAPA);
2605         if (IS_ERR(di))
2606                 GOTO(put, rc = PTR_ERR(di));
2607
2608         rc = iops->load(env, di, 0);
2609         if (rc == -ESRCH) {
2610                 /* -ESRCH means that the orphan OST-objects rbtree has been
2611                  * cleanup because of the OSS server restart or other errors. */
2612                 lfsck_lad_set_bitmap(env, com, ltd->ltd_index);
2613                 GOTO(fini, rc);
2614         }
2615
2616         if (rc == 0)
2617                 rc = iops->next(env, di);
2618         else if (rc > 0)
2619                 rc = 0;
2620
2621         if (rc < 0)
2622                 GOTO(fini, rc);
2623
2624         if (rc > 0)
2625                 GOTO(fini, rc = 0);
2626
2627         do {
2628                 struct dt_key           *key;
2629                 struct lu_orphan_rec    *rec = &info->lti_rec;
2630
2631                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY3, cfs_fail_val) &&
2632                     unlikely(!thread_is_running(&lfsck->li_thread)))
2633                         break;
2634
2635                 key = iops->key(env, di);
2636                 com->lc_fid_latest_scanned_phase2 = *(struct lu_fid *)key;
2637                 rc = iops->rec(env, di, (struct dt_rec *)rec, 0);
2638                 if (rc == 0)
2639                         rc = lfsck_layout_scan_orphan_one(env, com, ltd, rec,
2640                                         &com->lc_fid_latest_scanned_phase2);
2641                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
2642                         GOTO(fini, rc);
2643
2644                 lfsck_control_speed_by_self(com);
2645                 do {
2646                         rc = iops->next(env, di);
2647                 } while (rc < 0 && !(bk->lb_param & LPF_FAILOUT));
2648         } while (rc == 0);
2649
2650         GOTO(fini, rc);
2651
2652 fini:
2653         iops->put(env, di);
2654         iops->fini(env, di);
2655 put:
2656         lu_object_put(env, &obj->do_lu);
2657
2658 log:
2659         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant finished the orphan "
2660                "scanning for OST%04x: rc = %d\n",
2661                lfsck_lfsck2name(lfsck), ltd->ltd_index, rc);
2662
2663         return rc > 0 ? 0 : rc;
2664 }
2665
2666 /* For the MDT-object with dangling reference, we need to repare the
2667  * inconsistency according to the LFSCK sponsor's requirement:
2668  *
2669  * 1) Keep the inconsistency there and report the inconsistency case,
2670  *    then give the chance to the application to find related issues,
2671  *    and the users can make the decision about how to handle it with
2672  *    more human knownledge. (by default)
2673  *
2674  * 2) Re-create the missing OST-object with the FID/owner information. */
2675 static int lfsck_layout_repair_dangling(const struct lu_env *env,
2676                                         struct lfsck_component *com,
2677                                         struct dt_object *parent,
2678                                         struct lfsck_layout_req *llr,
2679                                         const struct lu_attr *pla)
2680 {
2681         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2682         struct filter_fid               *pfid   = &info->lti_new_pfid;
2683         struct dt_allocation_hint       *hint   = &info->lti_hint;
2684         struct lu_attr                  *cla    = &info->lti_la2;
2685         struct dt_object                *child  = llr->llr_child;
2686         struct dt_device                *dev    = lfsck_obj2dt_dev(child);
2687         const struct lu_fid             *tfid   = lu_object_fid(&parent->do_lu);
2688         struct thandle                  *handle;
2689         struct lu_buf                   *buf;
2690         struct lustre_handle             lh     = { 0 };
2691         int                              rc;
2692         bool                             create;
2693         ENTRY;
2694
2695         if (com->lc_lfsck->li_bookmark_ram.lb_param & LPF_CREATE_OSTOBJ)
2696                 create = true;
2697         else
2698                 create = false;
2699
2700         if (!create)
2701                 GOTO(log, rc = 1);
2702
2703         memset(cla, 0, sizeof(*cla));
2704         cla->la_uid = pla->la_uid;
2705         cla->la_gid = pla->la_gid;
2706         cla->la_mode = S_IFREG | 0666;
2707         cla->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
2708                         LA_ATIME | LA_MTIME | LA_CTIME;
2709
2710         rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
2711                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2712                               LCK_EX);
2713         if (rc != 0)
2714                 GOTO(log, rc);
2715
2716         handle = dt_trans_create(env, dev);
2717         if (IS_ERR(handle))
2718                 GOTO(unlock1, rc = PTR_ERR(handle));
2719
2720         hint->dah_parent = NULL;
2721         hint->dah_mode = 0;
2722         pfid->ff_parent.f_seq = cpu_to_le64(tfid->f_seq);
2723         pfid->ff_parent.f_oid = cpu_to_le32(tfid->f_oid);
2724         /* Currently, the filter_fid::ff_parent::f_ver is not the real parent
2725          * MDT-object's FID::f_ver, instead it is the OST-object index in its
2726          * parent MDT-object's layout EA. */
2727         pfid->ff_parent.f_stripe_idx = cpu_to_le32(llr->llr_lov_idx);
2728         buf = lfsck_buf_get(env, pfid, sizeof(struct filter_fid));
2729
2730         rc = dt_declare_create(env, child, cla, hint, NULL, handle);
2731         if (rc != 0)
2732                 GOTO(stop, rc);
2733
2734         rc = dt_declare_xattr_set(env, child, buf, XATTR_NAME_FID,
2735                                   LU_XATTR_CREATE, handle);
2736         if (rc != 0)
2737                 GOTO(stop, rc);
2738
2739         rc = dt_trans_start(env, dev, handle);
2740         if (rc != 0)
2741                 GOTO(stop, rc);
2742
2743         dt_read_lock(env, parent, 0);
2744         if (unlikely(lfsck_is_dead_obj(parent)))
2745                 GOTO(unlock2, rc = 1);
2746
2747         rc = dt_create(env, child, cla, hint, NULL, handle);
2748         if (rc != 0)
2749                 GOTO(unlock2, rc);
2750
2751         rc = dt_xattr_set(env, child, buf, XATTR_NAME_FID, LU_XATTR_CREATE,
2752                           handle, BYPASS_CAPA);
2753
2754         GOTO(unlock2, rc);
2755
2756 unlock2:
2757         dt_read_unlock(env, parent);
2758
2759 stop:
2760         rc = lfsck_layout_trans_stop(env, dev, handle, rc);
2761
2762 unlock1:
2763         lfsck_ibits_unlock(&lh, LCK_EX);
2764
2765 log:
2766         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant found dangling "
2767                "reference for: parent "DFID", child "DFID", OST-index %u, "
2768                "stripe-index %u, owner %u/%u. %s: rc = %d\n",
2769                lfsck_lfsck2name(com->lc_lfsck), PFID(lfsck_dto2fid(parent)),
2770                PFID(lfsck_dto2fid(child)), llr->llr_ost_idx,
2771                llr->llr_lov_idx, pla->la_uid, pla->la_gid,
2772                create ? "Create the lost OST-object as required" :
2773                         "Keep the MDT-object there by default", rc);
2774
2775         return rc;
2776 }
2777
2778 /* If the OST-object does not recognize the MDT-object as its parent, and
2779  * there is no other MDT-object claims as its parent, then just trust the
2780  * given MDT-object as its parent. So update the OST-object filter_fid. */
2781 static int lfsck_layout_repair_unmatched_pair(const struct lu_env *env,
2782                                               struct lfsck_component *com,
2783                                               struct dt_object *parent,
2784                                               struct lfsck_layout_req *llr,
2785                                               const struct lu_attr *pla)
2786 {
2787         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2788         struct filter_fid               *pfid   = &info->lti_new_pfid;
2789         struct lu_attr                  *tla    = &info->lti_la3;
2790         struct dt_object                *child  = llr->llr_child;
2791         struct dt_device                *dev    = lfsck_obj2dt_dev(child);
2792         const struct lu_fid             *tfid   = lu_object_fid(&parent->do_lu);
2793         struct thandle                  *handle;
2794         struct lu_buf                   *buf;
2795         struct lustre_handle             lh     = { 0 };
2796         int                              rc;
2797         ENTRY;
2798
2799         rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
2800                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2801                               LCK_EX);
2802         if (rc != 0)
2803                 GOTO(log, rc);
2804
2805         handle = dt_trans_create(env, dev);
2806         if (IS_ERR(handle))
2807                 GOTO(unlock1, rc = PTR_ERR(handle));
2808
2809         pfid->ff_parent.f_seq = cpu_to_le64(tfid->f_seq);
2810         pfid->ff_parent.f_oid = cpu_to_le32(tfid->f_oid);
2811         /* Currently, the filter_fid::ff_parent::f_ver is not the real parent
2812          * MDT-object's FID::f_ver, instead it is the OST-object index in its
2813          * parent MDT-object's layout EA. */
2814         pfid->ff_parent.f_stripe_idx = cpu_to_le32(llr->llr_lov_idx);
2815         buf = lfsck_buf_get(env, pfid, sizeof(struct filter_fid));
2816
2817         rc = dt_declare_xattr_set(env, child, buf, XATTR_NAME_FID, 0, handle);
2818         if (rc != 0)
2819                 GOTO(stop, rc);
2820
2821         tla->la_valid = LA_UID | LA_GID;
2822         tla->la_uid = pla->la_uid;
2823         tla->la_gid = pla->la_gid;
2824         rc = dt_declare_attr_set(env, child, tla, handle);
2825         if (rc != 0)
2826                 GOTO(stop, rc);
2827
2828         rc = dt_trans_start(env, dev, handle);
2829         if (rc != 0)
2830                 GOTO(stop, rc);
2831
2832         dt_write_lock(env, parent, 0);
2833         if (unlikely(lfsck_is_dead_obj(parent)))
2834                 GOTO(unlock2, rc = 1);
2835
2836         rc = dt_xattr_set(env, child, buf, XATTR_NAME_FID, 0, handle,
2837                           BYPASS_CAPA);
2838         if (rc != 0)
2839                 GOTO(unlock2, rc);
2840
2841         /* Get the latest parent's owner. */
2842         rc = dt_attr_get(env, parent, tla, BYPASS_CAPA);
2843         if (rc != 0)
2844                 GOTO(unlock2, rc);
2845
2846         tla->la_valid = LA_UID | LA_GID;
2847         rc = dt_attr_set(env, child, tla, handle, BYPASS_CAPA);
2848
2849         GOTO(unlock2, rc);
2850
2851 unlock2:
2852         dt_write_unlock(env, parent);
2853
2854 stop:
2855         rc = lfsck_layout_trans_stop(env, dev, handle, rc);
2856
2857 unlock1:
2858         lfsck_ibits_unlock(&lh, LCK_EX);
2859
2860 log:
2861         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant repaired unmatched "
2862                "MDT-OST pair for: parent "DFID", child "DFID", OST-index %u, "
2863                "stripe-index %u, owner %u/%u: rc = %d\n",
2864                lfsck_lfsck2name(com->lc_lfsck), PFID(lfsck_dto2fid(parent)),
2865                PFID(lfsck_dto2fid(child)), llr->llr_ost_idx, llr->llr_lov_idx,
2866                pla->la_uid, pla->la_gid, rc);
2867
2868         return rc;
2869 }
2870
2871 /* If there are more than one MDT-objects claim as the OST-object's parent,
2872  * and the OST-object only recognizes one of them, then we need to generate
2873  * new OST-object(s) with new fid(s) for the non-recognized MDT-object(s). */
2874 static int lfsck_layout_repair_multiple_references(const struct lu_env *env,
2875                                                    struct lfsck_component *com,
2876                                                    struct dt_object *parent,
2877                                                    struct lfsck_layout_req *llr,
2878                                                    struct lu_attr *la,
2879                                                    struct lu_buf *buf)
2880 {
2881         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2882         struct dt_allocation_hint       *hint   = &info->lti_hint;
2883         struct dt_object_format         *dof    = &info->lti_dof;
2884         struct dt_device                *pdev   = com->lc_lfsck->li_next;
2885         struct ost_id                   *oi     = &info->lti_oi;
2886         struct dt_device                *cdev   = lfsck_obj2dt_dev(llr->llr_child);
2887         struct dt_object                *child  = NULL;
2888         struct lu_device                *d      = &cdev->dd_lu_dev;
2889         struct lu_object                *o      = NULL;
2890         struct thandle                  *handle;
2891         struct lov_mds_md_v1            *lmm;
2892         struct lov_ost_data_v1          *objs;
2893         struct lustre_handle             lh     = { 0 };
2894         struct lu_buf                    ea_buf;
2895         __u32                            magic;
2896         int                              rc;
2897         ENTRY;
2898
2899         rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
2900                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2901                               LCK_EX);
2902         if (rc != 0)
2903                 GOTO(log, rc);
2904
2905         handle = dt_trans_create(env, pdev);
2906         if (IS_ERR(handle))
2907                 GOTO(unlock1, rc = PTR_ERR(handle));
2908
2909         o = lu_object_anon(env, d, NULL);
2910         if (IS_ERR(o))
2911                 GOTO(stop, rc = PTR_ERR(o));
2912
2913         child = container_of(o, struct dt_object, do_lu);
2914         o = lu_object_locate(o->lo_header, d->ld_type);
2915         if (unlikely(o == NULL))
2916                 GOTO(stop, rc = -EINVAL);
2917
2918         child = container_of(o, struct dt_object, do_lu);
2919         la->la_valid = LA_UID | LA_GID;
2920         hint->dah_parent = NULL;
2921         hint->dah_mode = 0;
2922         dof->dof_type = DFT_REGULAR;
2923         rc = dt_declare_create(env, child, la, NULL, NULL, handle);
2924         if (rc != 0)
2925                 GOTO(stop, rc);
2926
2927         rc = dt_declare_xattr_set(env, parent, buf, XATTR_NAME_LOV,
2928                                   LU_XATTR_REPLACE, handle);
2929         if (rc != 0)
2930                 GOTO(stop, rc);
2931
2932         rc = dt_trans_start(env, pdev, handle);
2933         if (rc != 0)
2934                 GOTO(stop, rc);
2935
2936         dt_write_lock(env, parent, 0);
2937         if (unlikely(lfsck_is_dead_obj(parent)))
2938                 GOTO(unlock2, rc = 0);
2939
2940         rc = dt_xattr_get(env, parent, buf, XATTR_NAME_LOV, BYPASS_CAPA);
2941         if (unlikely(rc == 0 || rc == -ENODATA || rc == -ERANGE))
2942                 GOTO(unlock2, rc = 0);
2943
2944         lmm = buf->lb_buf;
2945         /* Someone change layout during the LFSCK, no need to repair then. */
2946         if (le16_to_cpu(lmm->lmm_layout_gen) != llr->llr_parent->llo_gen)
2947                 GOTO(unlock2, rc = 0);
2948
2949         rc = dt_create(env, child, la, hint, dof, handle);
2950         if (rc != 0)
2951                 GOTO(unlock2, rc);
2952
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[0];
2960         } else {
2961                 LASSERT(magic == LOV_MAGIC_V3);
2962                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
2963         }
2964
2965         lmm->lmm_layout_gen = cpu_to_le16(llr->llr_parent->llo_gen + 1);
2966         fid_to_ostid(lu_object_fid(&child->do_lu), oi);
2967         ostid_cpu_to_le(oi, &objs[llr->llr_lov_idx].l_ost_oi);
2968         objs[llr->llr_lov_idx].l_ost_gen = cpu_to_le32(0);
2969         objs[llr->llr_lov_idx].l_ost_idx = cpu_to_le32(llr->llr_ost_idx);
2970         lfsck_buf_init(&ea_buf, lmm,
2971                        lov_mds_md_size(le16_to_cpu(lmm->lmm_stripe_count),
2972                                        magic));
2973         rc = dt_xattr_set(env, parent, &ea_buf, XATTR_NAME_LOV,
2974                           LU_XATTR_REPLACE, handle, BYPASS_CAPA);
2975
2976         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
2977
2978 unlock2:
2979         dt_write_unlock(env, parent);
2980
2981 stop:
2982         if (child != NULL)
2983                 lu_object_put(env, &child->do_lu);
2984
2985         dt_trans_stop(env, pdev, handle);
2986
2987 unlock1:
2988         lfsck_ibits_unlock(&lh, LCK_EX);
2989
2990 log:
2991         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant repaired multiple "
2992                "references for: parent "DFID", OST-index %u, stripe-index %u, "
2993                "owner %u/%u: rc = %d\n",
2994                lfsck_lfsck2name(com->lc_lfsck), PFID(lfsck_dto2fid(parent)),
2995                llr->llr_ost_idx, llr->llr_lov_idx, la->la_uid, la->la_gid, rc);
2996
2997         return rc;
2998 }
2999
3000 /* If the MDT-object and the OST-object have different owner information,
3001  * then trust the MDT-object, because the normal chown/chgrp handle order
3002  * is from MDT to OST, and it is possible that some chown/chgrp operation
3003  * is partly done. */
3004 static int lfsck_layout_repair_owner(const struct lu_env *env,
3005                                      struct lfsck_component *com,
3006                                      struct dt_object *parent,
3007                                      struct lfsck_layout_req *llr,
3008                                      struct lu_attr *pla)
3009 {
3010         struct lfsck_thread_info        *info   = lfsck_env_info(env);
3011         struct lu_attr                  *tla    = &info->lti_la3;
3012         struct dt_object                *child  = llr->llr_child;
3013         struct dt_device                *dev    = lfsck_obj2dt_dev(child);
3014         struct thandle                  *handle;
3015         int                              rc;
3016         ENTRY;
3017
3018         handle = dt_trans_create(env, dev);
3019         if (IS_ERR(handle))
3020                 GOTO(log, rc = PTR_ERR(handle));
3021
3022         tla->la_uid = pla->la_uid;
3023         tla->la_gid = pla->la_gid;
3024         tla->la_valid = LA_UID | LA_GID;
3025         rc = dt_declare_attr_set(env, child, tla, handle);
3026         if (rc != 0)
3027                 GOTO(stop, rc);
3028
3029         rc = dt_trans_start(env, dev, handle);
3030         if (rc != 0)
3031                 GOTO(stop, rc);
3032
3033         /* Use the dt_object lock to serialize with destroy and attr_set. */
3034         dt_read_lock(env, parent, 0);
3035         if (unlikely(lfsck_is_dead_obj(parent)))
3036                 GOTO(unlock, rc = 1);
3037
3038         /* Get the latest parent's owner. */
3039         rc = dt_attr_get(env, parent, tla, BYPASS_CAPA);
3040         if (rc != 0)
3041                 GOTO(unlock, rc);
3042
3043         /* Some others chown/chgrp during the LFSCK, needs to do nothing. */
3044         if (unlikely(tla->la_uid != pla->la_uid ||
3045                      tla->la_gid != pla->la_gid))
3046                 GOTO(unlock, rc = 1);
3047
3048         tla->la_valid = LA_UID | LA_GID;
3049         rc = dt_attr_set(env, child, tla, handle, BYPASS_CAPA);
3050
3051         GOTO(unlock, rc);
3052
3053 unlock:
3054         dt_read_unlock(env, parent);
3055
3056 stop:
3057         rc = lfsck_layout_trans_stop(env, dev, handle, rc);
3058
3059 log:
3060         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant repaired inconsistent "
3061                "file owner for: parent "DFID", child "DFID", OST-index %u, "
3062                "stripe-index %u, owner %u/%u: rc = %d\n",
3063                lfsck_lfsck2name(com->lc_lfsck), PFID(lfsck_dto2fid(parent)),
3064                PFID(lfsck_dto2fid(child)), llr->llr_ost_idx, llr->llr_lov_idx,
3065                pla->la_uid, pla->la_gid, rc);
3066
3067         return rc;
3068 }
3069
3070 /* Check whether the OST-object correctly back points to the
3071  * MDT-object (@parent) via the XATTR_NAME_FID xattr (@pfid). */
3072 static int lfsck_layout_check_parent(const struct lu_env *env,
3073                                      struct lfsck_component *com,
3074                                      struct dt_object *parent,
3075                                      const struct lu_fid *pfid,
3076                                      const struct lu_fid *cfid,
3077                                      const struct lu_attr *pla,
3078                                      const struct lu_attr *cla,
3079                                      struct lfsck_layout_req *llr,
3080                                      struct lu_buf *lov_ea, __u32 idx)
3081 {
3082         struct lfsck_thread_info        *info   = lfsck_env_info(env);
3083         struct lu_buf                   *buf    = &info->lti_big_buf;
3084         struct dt_object                *tobj;
3085         struct lov_mds_md_v1            *lmm;
3086         struct lov_ost_data_v1          *objs;
3087         struct lustre_handle             lh     = { 0 };
3088         int                              rc;
3089         int                              i;
3090         __u32                            magic;
3091         __u16                            count;
3092         ENTRY;
3093
3094         if (fid_is_zero(pfid)) {
3095                 /* client never wrote. */
3096                 if (cla->la_size == 0 && cla->la_blocks == 0) {
3097                         if (unlikely(cla->la_uid != pla->la_uid ||
3098                                      cla->la_gid != pla->la_gid))
3099                                 RETURN (LLIT_INCONSISTENT_OWNER);
3100
3101                         RETURN(0);
3102                 }
3103
3104                 RETURN(LLIT_UNMATCHED_PAIR);
3105         }
3106
3107         if (unlikely(!fid_is_sane(pfid)))
3108                 RETURN(LLIT_UNMATCHED_PAIR);
3109
3110         if (lu_fid_eq(pfid, lu_object_fid(&parent->do_lu))) {
3111                 if (llr->llr_lov_idx == idx)
3112                         RETURN(0);
3113
3114                 RETURN(LLIT_UNMATCHED_PAIR);
3115         }
3116
3117         tobj = lfsck_object_find(env, com->lc_lfsck, pfid);
3118         if (IS_ERR(tobj))
3119                 RETURN(PTR_ERR(tobj));
3120
3121         if (dt_object_exists(tobj) == 0 ||
3122             lfsck_is_dead_obj(tobj))
3123                 GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3124
3125         if (!S_ISREG(lfsck_object_type(tobj)))
3126                 GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3127
3128         /* Load the tobj's layout EA, in spite of it is a local MDT-object or
3129          * remote one on another MDT. Then check whether the given OST-object
3130          * is in such layout. If yes, it is multiple referenced, otherwise it
3131          * is unmatched referenced case. */
3132         rc = lfsck_layout_get_lovea(env, tobj, buf);
3133         if (rc == 0 || rc == -ENOENT)
3134                 GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3135
3136         if (rc < 0)
3137                 GOTO(out, rc);
3138
3139         lmm = buf->lb_buf;
3140         magic = le32_to_cpu(lmm->lmm_magic);
3141         if (magic == LOV_MAGIC_V1) {
3142                 objs = &lmm->lmm_objects[0];
3143         } else {
3144                 LASSERT(magic == LOV_MAGIC_V3);
3145                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
3146         }
3147
3148         count = le16_to_cpu(lmm->lmm_stripe_count);
3149         for (i = 0; i < count; i++, objs++) {
3150                 struct lu_fid           *tfid   = &info->lti_fid2;
3151                 struct ost_id           *oi     = &info->lti_oi;
3152                 __u32                    idx2;
3153
3154                 if (lovea_slot_is_dummy(objs))
3155                         continue;
3156
3157                 ostid_le_to_cpu(&objs->l_ost_oi, oi);
3158                 idx2 = le32_to_cpu(objs->l_ost_idx);
3159                 rc = ostid_to_fid(tfid, oi, idx2);
3160                 if (rc != 0) {
3161                         CDEBUG(D_LFSCK, "%s: the parent "DFID" contains "
3162                                "invalid layout EA at the slot %d, index %u\n",
3163                                lfsck_lfsck2name(com->lc_lfsck),
3164                                PFID(pfid), i, idx2);
3165
3166                         GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3167                 }
3168
3169                 if (lu_fid_eq(cfid, tfid)) {
3170                         rc = lfsck_ibits_lock(env, com->lc_lfsck, tobj, &lh,
3171                                               MDS_INODELOCK_UPDATE |
3172                                               MDS_INODELOCK_LAYOUT |
3173                                               MDS_INODELOCK_XATTR,
3174                                               LCK_EX);
3175                         if (rc != 0)
3176                                 GOTO(out, rc);
3177
3178                         dt_read_lock(env, tobj, 0);
3179
3180                         /* For local MDT-object, re-check existence
3181                          * after taken the lock. */
3182                         if (!dt_object_remote(tobj)) {
3183                                 if (dt_object_exists(tobj) == 0 ||
3184                                     lfsck_is_dead_obj(tobj)) {
3185                                         rc = LLIT_UNMATCHED_PAIR;
3186                                 } else {
3187                                         *lov_ea = *buf;
3188                                         rc = LLIT_MULTIPLE_REFERENCED;
3189                                 }
3190
3191                                 GOTO(unlock, rc);
3192                         }
3193
3194                         /* For migration case, the new MDT-object and old
3195                          * MDT-object may reference the same OST-object at
3196                          * some migration internal time.
3197                          *
3198                          * For remote MDT-object, the local MDT may not know
3199                          * whether it has been removed or not.  Try checking
3200                          * for a non-existent xattr to check if this object
3201                          * has been been removed or not. */
3202                         rc = dt_xattr_get(env, tobj, &LU_BUF_NULL,
3203                                           XATTR_NAME_DUMMY, BYPASS_CAPA);
3204                         if (unlikely(rc == -ENOENT || rc >= 0)) {
3205                                 rc = LLIT_UNMATCHED_PAIR;
3206                         } else if (rc == -ENODATA) {
3207                                 *lov_ea = *buf;
3208                                 rc = LLIT_MULTIPLE_REFERENCED;
3209                         }
3210
3211                         GOTO(unlock, rc);
3212                 }
3213         }
3214
3215         GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3216
3217 unlock:
3218         if (lustre_handle_is_used(&lh)) {
3219                 dt_read_unlock(env, tobj);
3220                 lfsck_ibits_unlock(&lh, LCK_EX);
3221         }
3222
3223 out:
3224         lfsck_object_put(env, tobj);
3225
3226         return rc;
3227 }
3228
3229 static int lfsck_layout_assistant_handler_p1(const struct lu_env *env,
3230                                              struct lfsck_component *com,
3231                                              struct lfsck_assistant_req *lar)
3232 {
3233         struct lfsck_layout_req              *llr    =
3234                         container_of0(lar, struct lfsck_layout_req, llr_lar);
3235         struct lfsck_layout                  *lo     = com->lc_file_ram;
3236         struct lfsck_thread_info             *info   = lfsck_env_info(env);
3237         struct filter_fid_old                *pea    = &info->lti_old_pfid;
3238         struct lu_fid                        *pfid   = &info->lti_fid;
3239         struct lu_buf                         buf    = { NULL };
3240         struct dt_object                     *parent;
3241         struct dt_object                     *child  = llr->llr_child;
3242         struct lu_attr                       *pla    = &info->lti_la;
3243         struct lu_attr                       *cla    = &info->lti_la2;
3244         struct lfsck_instance                *lfsck  = com->lc_lfsck;
3245         struct lfsck_bookmark                *bk     = &lfsck->li_bookmark_ram;
3246         enum lfsck_layout_inconsistency_type  type   = LLIT_NONE;
3247         __u32                                 idx    = 0;
3248         int                                   rc;
3249         ENTRY;
3250
3251         parent = lfsck_object_find(env, lfsck, &lar->lar_fid);
3252         if (IS_ERR(parent))
3253                 RETURN(PTR_ERR(parent));
3254
3255         if (unlikely(lfsck_is_dead_obj(parent)))
3256                 GOTO(put_parent, rc = 0);
3257
3258         rc = dt_attr_get(env, parent, pla, BYPASS_CAPA);
3259         if (rc != 0)
3260                 GOTO(out, rc);
3261
3262         rc = dt_attr_get(env, child, cla, BYPASS_CAPA);
3263         if (rc == -ENOENT) {
3264                 if (unlikely(lfsck_is_dead_obj(parent)))
3265                         GOTO(put_parent, rc = 0);
3266
3267                 type = LLIT_DANGLING;
3268                 goto repair;
3269         }
3270
3271         if (rc != 0)
3272                 GOTO(out, rc);
3273
3274         lfsck_buf_init(&buf, pea, sizeof(struct filter_fid_old));
3275         rc = dt_xattr_get(env, child, &buf, XATTR_NAME_FID, BYPASS_CAPA);
3276         if (unlikely(rc >= 0 && rc != sizeof(struct filter_fid_old) &&
3277                      rc != sizeof(struct filter_fid))) {
3278                 type = LLIT_UNMATCHED_PAIR;
3279                 goto repair;
3280         }
3281
3282         if (rc < 0 && rc != -ENODATA)
3283                 GOTO(out, rc);
3284
3285         if (rc == -ENODATA) {
3286                 fid_zero(pfid);
3287         } else {
3288                 fid_le_to_cpu(pfid, &pea->ff_parent);
3289                 /* Currently, the filter_fid::ff_parent::f_ver is not the
3290                  * real parent MDT-object's FID::f_ver, instead it is the
3291                  * OST-object index in its parent MDT-object's layout EA. */
3292                 idx = pfid->f_stripe_idx;
3293                 pfid->f_ver = 0;
3294         }
3295
3296         rc = lfsck_layout_check_parent(env, com, parent, pfid,
3297                                        lu_object_fid(&child->do_lu),
3298                                        pla, cla, llr, &buf, idx);
3299         if (rc > 0) {
3300                 type = rc;
3301                 goto repair;
3302         }
3303
3304         if (rc < 0)
3305                 GOTO(out, rc);
3306
3307         if (unlikely(cla->la_uid != pla->la_uid ||
3308                      cla->la_gid != pla->la_gid)) {
3309                 type = LLIT_INCONSISTENT_OWNER;
3310                 goto repair;
3311         }
3312
3313 repair:
3314         if (bk->lb_param & LPF_DRYRUN) {
3315                 if (type != LLIT_NONE)
3316                         GOTO(out, rc = 1);
3317                 else
3318                         GOTO(out, rc = 0);
3319         }
3320
3321         switch (type) {
3322         case LLIT_DANGLING:
3323                 rc = lfsck_layout_repair_dangling(env, com, parent, llr, pla);
3324                 break;
3325         case LLIT_UNMATCHED_PAIR:
3326                 rc = lfsck_layout_repair_unmatched_pair(env, com, parent,
3327                                                         llr, pla);
3328                 break;
3329         case LLIT_MULTIPLE_REFERENCED:
3330                 rc = lfsck_layout_repair_multiple_references(env, com, parent,
3331                                                              llr, pla, &buf);
3332                 break;
3333         case LLIT_INCONSISTENT_OWNER:
3334                 rc = lfsck_layout_repair_owner(env, com, parent, llr, pla);
3335                 break;
3336         default:
3337                 rc = 0;
3338                 break;
3339         }
3340
3341         GOTO(out, rc);
3342
3343 out:
3344         down_write(&com->lc_sem);
3345         if (rc < 0) {
3346                 struct lfsck_assistant_data *lad = com->lc_data;
3347
3348                 if (unlikely(lad->lad_exit)) {
3349                         rc = 0;
3350                 } else if (rc == -ENOTCONN || rc == -ESHUTDOWN ||
3351                            rc == -ETIMEDOUT || rc == -EHOSTDOWN ||
3352                            rc == -EHOSTUNREACH) {
3353                         /* If cannot touch the target server,
3354                          * mark the LFSCK as INCOMPLETE. */
3355                         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant fail to "
3356                                "talk with OST %x: rc = %d\n",
3357                                lfsck_lfsck2name(lfsck), llr->llr_ost_idx, rc);
3358                         lfsck_lad_set_bitmap(env, com, llr->llr_ost_idx);
3359                         lo->ll_objs_skipped++;
3360                         rc = 0;
3361                 } else {
3362                         lfsck_layout_record_failure(env, lfsck, lo);
3363                 }
3364         } else if (rc > 0) {
3365                 LASSERTF(type > LLIT_NONE && type <= LLIT_MAX,
3366                          "unknown type = %d\n", type);
3367
3368                 lo->ll_objs_repaired[type - 1]++;
3369                 if (bk->lb_param & LPF_DRYRUN &&
3370                     unlikely(lo->ll_pos_first_inconsistent == 0))
3371                         lo->ll_pos_first_inconsistent =
3372                         lfsck->li_obj_oit->do_index_ops->dio_it.store(env,
3373                                                         lfsck->li_di_oit);
3374         }
3375         up_write(&com->lc_sem);
3376
3377 put_parent:
3378         lu_object_put(env, &parent->do_lu);
3379
3380         return rc;
3381 }
3382
3383 static int lfsck_layout_assistant_handler_p2(const struct lu_env *env,
3384                                              struct lfsck_component *com)
3385 {
3386         struct lfsck_assistant_data     *lad    = com->lc_data;
3387         struct lfsck_instance           *lfsck  = com->lc_lfsck;
3388         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
3389         struct lfsck_tgt_descs          *ltds   = &lfsck->li_ost_descs;
3390         struct lfsck_tgt_desc           *ltd;
3391         int                              rc     = 0;
3392         ENTRY;
3393
3394         CDEBUG(D_LFSCK, "%s: layout LFSCK phase2 scan start\n",
3395                lfsck_lfsck2name(lfsck));
3396
3397         spin_lock(&ltds->ltd_lock);
3398         while (!list_empty(&lad->lad_ost_phase2_list)) {
3399                 ltd = list_entry(lad->lad_ost_phase2_list.next,
3400                                  struct lfsck_tgt_desc,
3401                                  ltd_layout_phase_list);
3402                 list_del_init(&ltd->ltd_layout_phase_list);
3403                 if (bk->lb_param & LPF_ALL_TGT) {
3404                         spin_unlock(&ltds->ltd_lock);
3405                         rc = lfsck_layout_scan_orphan(env, com, ltd);
3406                         if (rc != 0 && bk->lb_param & LPF_FAILOUT)
3407                                 RETURN(rc);
3408
3409                         if (unlikely(lad->lad_exit ||
3410                                      !thread_is_running(&lfsck->li_thread)))
3411                                 RETURN(0);
3412                         spin_lock(&ltds->ltd_lock);
3413                 }
3414         }
3415
3416         if (list_empty(&lad->lad_ost_phase1_list))
3417                 rc = 1;
3418         else
3419                 rc = 0;
3420         spin_unlock(&ltds->ltd_lock);
3421
3422         CDEBUG(D_LFSCK, "%s: layout LFSCK phase2 scan stop: rc = %d\n",
3423                lfsck_lfsck2name(lfsck), rc);
3424
3425         RETURN(rc);
3426 }
3427
3428 static int
3429 lfsck_layout_slave_async_interpret(const struct lu_env *env,
3430                                    struct ptlrpc_request *req,
3431                                    void *args, int rc)
3432 {
3433         struct lfsck_layout_slave_async_args *llsaa = args;
3434         struct obd_export                    *exp   = llsaa->llsaa_exp;
3435         struct lfsck_component               *com   = llsaa->llsaa_com;
3436         struct lfsck_layout_slave_target     *llst  = llsaa->llsaa_llst;
3437         struct lfsck_layout_slave_data       *llsd  = com->lc_data;
3438         struct lfsck_reply                   *lr    = NULL;
3439         bool                                  done  = false;
3440
3441         if (rc != 0) {
3442                 /* It is quite probably caused by target crash,
3443                  * to make the LFSCK can go ahead, assume that
3444                  * the target finished the LFSCK prcoessing. */
3445                 done = true;
3446         } else {
3447                 lr = req_capsule_server_get(&req->rq_pill, &RMF_LFSCK_REPLY);
3448                 if (lr->lr_status != LS_SCANNING_PHASE1 &&
3449                     lr->lr_status != LS_SCANNING_PHASE2)
3450                         done = true;
3451         }
3452
3453         if (done) {
3454                 CDEBUG(D_LFSCK, "%s: layout LFSCK slave gets the MDT %x "
3455                        "status %d\n", lfsck_lfsck2name(com->lc_lfsck),
3456                        llst->llst_index, lr != NULL ? lr->lr_status : rc);
3457
3458                 lfsck_layout_llst_del(llsd, llst);
3459         }
3460
3461         lfsck_layout_llst_put(llst);
3462         lfsck_component_put(env, com);
3463         class_export_put(exp);
3464
3465         return 0;
3466 }
3467
3468 static int lfsck_layout_async_query(const struct lu_env *env,
3469                                     struct lfsck_component *com,
3470                                     struct obd_export *exp,
3471                                     struct lfsck_layout_slave_target *llst,
3472                                     struct lfsck_request *lr,
3473                                     struct ptlrpc_request_set *set)
3474 {
3475         struct lfsck_layout_slave_async_args *llsaa;
3476         struct ptlrpc_request                *req;
3477         struct lfsck_request                 *tmp;
3478         int                                   rc;
3479         ENTRY;
3480
3481         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LFSCK_QUERY);
3482         if (req == NULL)
3483                 RETURN(-ENOMEM);
3484
3485         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_QUERY);
3486         if (rc != 0) {
3487                 ptlrpc_request_free(req);
3488                 RETURN(rc);
3489         }
3490
3491         tmp = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
3492         *tmp = *lr;
3493         ptlrpc_request_set_replen(req);
3494
3495         llsaa = ptlrpc_req_async_args(req);
3496         llsaa->llsaa_exp = exp;
3497         llsaa->llsaa_com = lfsck_component_get(com);
3498         llsaa->llsaa_llst = llst;
3499         req->rq_interpret_reply = lfsck_layout_slave_async_interpret;
3500         ptlrpc_set_add_req(set, req);
3501
3502         RETURN(0);
3503 }
3504
3505 static int lfsck_layout_async_notify(const struct lu_env *env,
3506                                      struct obd_export *exp,
3507                                      struct lfsck_request *lr,
3508                                      struct ptlrpc_request_set *set)
3509 {
3510         struct ptlrpc_request   *req;
3511         struct lfsck_request    *tmp;
3512         int                      rc;
3513         ENTRY;
3514
3515         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LFSCK_NOTIFY);
3516         if (req == NULL)
3517                 RETURN(-ENOMEM);
3518
3519         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_NOTIFY);
3520         if (rc != 0) {
3521                 ptlrpc_request_free(req);
3522                 RETURN(rc);
3523         }
3524
3525         tmp = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
3526         *tmp = *lr;
3527         ptlrpc_request_set_replen(req);
3528         ptlrpc_set_add_req(set, req);
3529
3530         RETURN(0);
3531 }
3532
3533 static int
3534 lfsck_layout_slave_query_master(const struct lu_env *env,
3535                                 struct lfsck_component *com)
3536 {
3537         struct lfsck_request             *lr    = &lfsck_env_info(env)->lti_lr;
3538         struct lfsck_instance            *lfsck = com->lc_lfsck;
3539         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
3540         struct lfsck_layout_slave_target *llst;
3541         struct obd_export                *exp;
3542         struct ptlrpc_request_set        *set;
3543         int                               rc    = 0;
3544         int                               rc1   = 0;
3545         ENTRY;
3546
3547         set = ptlrpc_prep_set();
3548         if (set == NULL)
3549                 GOTO(log, rc = -ENOMEM);
3550
3551         memset(lr, 0, sizeof(*lr));
3552         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
3553         lr->lr_event = LE_QUERY;
3554         lr->lr_active = LFSCK_TYPE_LAYOUT;
3555
3556         llsd->llsd_touch_gen++;
3557         spin_lock(&llsd->llsd_lock);
3558         while (!list_empty(&llsd->llsd_master_list)) {
3559                 llst = list_entry(llsd->llsd_master_list.next,
3560                                   struct lfsck_layout_slave_target,
3561                                   llst_list);
3562                 if (llst->llst_gen == llsd->llsd_touch_gen)
3563                         break;
3564
3565                 llst->llst_gen = llsd->llsd_touch_gen;
3566                 list_move_tail(&llst->llst_list,
3567                                &llsd->llsd_master_list);
3568                 atomic_inc(&llst->llst_ref);
3569                 spin_unlock(&llsd->llsd_lock);
3570
3571                 exp = lustre_find_lwp_by_index(lfsck->li_obd->obd_name,
3572                                                llst->llst_index);
3573                 if (exp == NULL) {
3574                         lfsck_layout_llst_del(llsd, llst);
3575                         lfsck_layout_llst_put(llst);
3576                         spin_lock(&llsd->llsd_lock);
3577                         continue;
3578                 }
3579
3580                 rc = lfsck_layout_async_query(env, com, exp, llst, lr, set);
3581                 if (rc != 0) {
3582                         CDEBUG(D_LFSCK, "%s: layout LFSCK slave fail to "
3583                                "query %s for layout: rc = %d\n",
3584                                lfsck_lfsck2name(lfsck),
3585                                exp->exp_obd->obd_name, rc);
3586
3587                         rc1 = rc;
3588                         lfsck_layout_llst_put(llst);
3589                         class_export_put(exp);
3590                 }
3591                 spin_lock(&llsd->llsd_lock);
3592         }
3593         spin_unlock(&llsd->llsd_lock);
3594
3595         rc = ptlrpc_set_wait(set);
3596         ptlrpc_set_destroy(set);
3597
3598         GOTO(log, rc = (rc1 != 0 ? rc1 : rc));
3599
3600 log:
3601         CDEBUG(D_LFSCK, "%s: layout LFSCK slave queries master: rc = %d\n",
3602                lfsck_lfsck2name(com->lc_lfsck), rc);
3603
3604         return rc;
3605 }
3606
3607 static void
3608 lfsck_layout_slave_notify_master(const struct lu_env *env,
3609                                  struct lfsck_component *com,
3610                                  enum lfsck_events event, int result)
3611 {
3612         struct lfsck_layout              *lo    = com->lc_file_ram;
3613         struct lfsck_instance            *lfsck = com->lc_lfsck;
3614         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
3615         struct lfsck_request             *lr    = &lfsck_env_info(env)->lti_lr;
3616         struct lfsck_layout_slave_target *llst;
3617         struct obd_export                *exp;
3618         struct ptlrpc_request_set        *set;
3619         int                               rc;
3620         ENTRY;
3621
3622         CDEBUG(D_LFSCK, "%s: layout LFSCK slave notifies master\n",
3623                lfsck_lfsck2name(com->lc_lfsck));
3624
3625         set = ptlrpc_prep_set();
3626         if (set == NULL)
3627                 RETURN_EXIT;
3628
3629         memset(lr, 0, sizeof(*lr));
3630         lr->lr_event = event;
3631         lr->lr_flags = LEF_FROM_OST;
3632         lr->lr_status = result;
3633         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
3634         lr->lr_active = LFSCK_TYPE_LAYOUT;
3635         lr->lr_flags2 = lo->ll_flags;
3636         llsd->llsd_touch_gen++;
3637         spin_lock(&llsd->llsd_lock);
3638         while (!list_empty(&llsd->llsd_master_list)) {
3639                 llst = list_entry(llsd->llsd_master_list.next,
3640                                   struct lfsck_layout_slave_target,
3641                                   llst_list);
3642                 if (llst->llst_gen == llsd->llsd_touch_gen)
3643                         break;
3644
3645                 llst->llst_gen = llsd->llsd_touch_gen;
3646                 list_move_tail(&llst->llst_list,
3647                                &llsd->llsd_master_list);
3648                 atomic_inc(&llst->llst_ref);
3649                 spin_unlock(&llsd->llsd_lock);
3650
3651                 exp = lustre_find_lwp_by_index(lfsck->li_obd->obd_name,
3652                                                llst->llst_index);
3653                 if (exp == NULL) {
3654                         lfsck_layout_llst_del(llsd, llst);
3655                         lfsck_layout_llst_put(llst);
3656                         spin_lock(&llsd->llsd_lock);
3657                         continue;
3658                 }
3659
3660                 rc = lfsck_layout_async_notify(env, exp, lr, set);
3661                 if (rc != 0)
3662                         CDEBUG(D_LFSCK, "%s: layout LFSCK slave fail to "
3663                                "notify %s for layout: rc = %d\n",
3664                                lfsck_lfsck2name(lfsck),
3665                                exp->exp_obd->obd_name, rc);
3666
3667                 lfsck_layout_llst_put(llst);
3668                 class_export_put(exp);
3669                 spin_lock(&llsd->llsd_lock);
3670         }
3671         spin_unlock(&llsd->llsd_lock);
3672
3673         ptlrpc_set_wait(set);
3674         ptlrpc_set_destroy(set);
3675
3676         RETURN_EXIT;
3677 }
3678
3679 /*
3680  * \ret -ENODATA: unrecognized stripe
3681  * \ret = 0     : recognized stripe
3682  * \ret < 0     : other failures
3683  */
3684 static int lfsck_layout_master_check_pairs(const struct lu_env *env,
3685                                            struct lfsck_component *com,
3686                                            struct lu_fid *cfid,
3687                                            struct lu_fid *pfid)
3688 {
3689         struct lfsck_thread_info        *info   = lfsck_env_info(env);
3690         struct lu_buf                   *buf    = &info->lti_big_buf;
3691         struct ost_id                   *oi     = &info->lti_oi;
3692         struct dt_object                *obj;
3693         struct lov_mds_md_v1            *lmm;
3694         struct lov_ost_data_v1          *objs;
3695         __u32                            idx    = pfid->f_stripe_idx;
3696         __u32                            magic;
3697         int                              rc     = 0;
3698         int                              i;
3699         __u16                            count;
3700         ENTRY;
3701
3702         pfid->f_ver = 0;
3703         obj = lfsck_object_find_by_dev(env, com->lc_lfsck->li_bottom, pfid);
3704         if (IS_ERR(obj))
3705                 RETURN(PTR_ERR(obj));
3706
3707         dt_read_lock(env, obj, 0);
3708         if (unlikely(dt_object_exists(obj) == 0 ||
3709                      lfsck_is_dead_obj(obj)))
3710                 GOTO(unlock, rc = -ENOENT);
3711
3712         if (!S_ISREG(lfsck_object_type(obj)))
3713                 GOTO(unlock, rc = -ENODATA);
3714
3715         rc = lfsck_layout_get_lovea(env, obj, buf);
3716         if (rc < 0)
3717                 GOTO(unlock, rc);
3718
3719         if (rc == 0)
3720                 GOTO(unlock, rc = -ENODATA);
3721
3722         lmm = buf->lb_buf;
3723         rc = lfsck_layout_verify_header(lmm);
3724         if (rc != 0)
3725                 GOTO(unlock, rc);
3726
3727         /* Currently, we only support LOV_MAGIC_V1/LOV_MAGIC_V3 which has
3728          * been verified in lfsck_layout_verify_header() already. If some
3729          * new magic introduced in the future, then layout LFSCK needs to
3730          * be updated also. */
3731         magic = le32_to_cpu(lmm->lmm_magic);
3732         if (magic == LOV_MAGIC_V1) {
3733                 objs = &lmm->lmm_objects[0];
3734         } else {
3735                 LASSERT(magic == LOV_MAGIC_V3);
3736                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
3737         }
3738
3739         fid_to_ostid(cfid, oi);
3740         count = le16_to_cpu(lmm->lmm_stripe_count);
3741         for (i = 0; i < count; i++, objs++) {
3742                 struct ost_id oi2;
3743
3744                 ostid_le_to_cpu(&objs->l_ost_oi, &oi2);
3745                 if (memcmp(oi, &oi2, sizeof(*oi)) == 0)
3746                         GOTO(unlock, rc = (i != idx ? -ENODATA : 0));
3747         }
3748
3749         GOTO(unlock, rc = -ENODATA);
3750
3751 unlock:
3752         dt_read_unlock(env, obj);
3753         lu_object_put(env, &obj->do_lu);
3754
3755         return rc;
3756 }
3757
3758 /*
3759  * The LFSCK-on-OST will ask the LFSCK-on-MDT to check whether the given
3760  * MDT-object/OST-object pairs match or not to aviod transfer MDT-object
3761  * layout EA from MDT to OST. On one hand, the OST no need to understand
3762  * the layout EA structure; on the other hand, it may cause trouble when
3763  * transfer large layout EA from MDT to OST via normal OUT RPC.
3764  *
3765  * \ret > 0: unrecognized stripe
3766  * \ret = 0: recognized stripe
3767  * \ret < 0: other failures
3768  */
3769 static int lfsck_layout_slave_check_pairs(const struct lu_env *env,
3770                                           struct lfsck_component *com,
3771                                           struct lu_fid *cfid,
3772                                           struct lu_fid *pfid)
3773 {
3774         struct lfsck_instance    *lfsck  = com->lc_lfsck;
3775         struct obd_device        *obd    = lfsck->li_obd;
3776         struct seq_server_site   *ss     =
3777                         lu_site2seq(lfsck->li_bottom->dd_lu_dev.ld_site);
3778         struct obd_export        *exp    = NULL;
3779         struct ptlrpc_request    *req    = NULL;
3780         struct lfsck_request     *lr;
3781         struct lu_seq_range      *range  = &lfsck_env_info(env)->lti_range;
3782         int                       rc     = 0;
3783         ENTRY;
3784
3785         if (unlikely(fid_is_idif(pfid)))
3786                 RETURN(1);
3787
3788         fld_range_set_any(range);
3789         rc = fld_server_lookup(env, ss->ss_server_fld, fid_seq(pfid), range);
3790         if (rc != 0)
3791                 RETURN(rc == -ENOENT ? 1 : rc);
3792
3793         if (unlikely(!fld_range_is_mdt(range)))
3794                 RETURN(1);
3795
3796         exp = lustre_find_lwp_by_index(obd->obd_name, range->lsr_index);
3797         if (unlikely(exp == NULL))
3798                 RETURN(1);
3799
3800         if (!(exp_connect_flags(exp) & OBD_CONNECT_LFSCK))
3801                 GOTO(out, rc = -EOPNOTSUPP);
3802
3803         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LFSCK_NOTIFY);
3804         if (req == NULL)
3805                 GOTO(out, rc = -ENOMEM);
3806
3807         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_NOTIFY);
3808         if (rc != 0) {
3809                 ptlrpc_request_free(req);
3810
3811                 GOTO(out, rc);
3812         }
3813
3814         lr = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
3815         memset(lr, 0, sizeof(*lr));
3816         lr->lr_event = LE_PAIRS_VERIFY;
3817         lr->lr_active = LFSCK_TYPE_LAYOUT;
3818         lr->lr_fid = *cfid; /* OST-object itself FID. */
3819         lr->lr_fid2 = *pfid; /* The claimed parent FID. */
3820
3821         ptlrpc_request_set_replen(req);
3822         rc = ptlrpc_queue_wait(req);
3823         ptlrpc_req_finished(req);
3824
3825         if (rc == -ENOENT || rc == -ENODATA)
3826                 rc = 1;
3827
3828         GOTO(out, rc);
3829
3830 out:
3831         if (exp != NULL)
3832                 class_export_put(exp);
3833
3834         return rc;
3835 }
3836
3837 static int lfsck_layout_slave_repair_pfid(const struct lu_env *env,
3838                                           struct lfsck_component *com,
3839                                           struct lfsck_request *lr)
3840 {
3841         struct lfsck_thread_info        *info   = lfsck_env_info(env);
3842         struct filter_fid               *ff     = &info->lti_new_pfid;
3843         struct lu_buf                   *buf;
3844         struct dt_device                *dev    = com->lc_lfsck->li_bottom;
3845         struct dt_object                *obj;
3846         struct thandle                  *th     = NULL;
3847         int                              rc     = 0;
3848         ENTRY;
3849
3850         obj = lfsck_object_find_by_dev(env, dev, &lr->lr_fid);
3851         if (IS_ERR(obj))
3852                 GOTO(log, rc = PTR_ERR(obj));
3853
3854         fid_cpu_to_le(&ff->ff_parent, &lr->lr_fid2);
3855         buf = lfsck_buf_get(env, ff, sizeof(*ff));
3856         dt_write_lock(env, obj, 0);
3857         if (unlikely(dt_object_exists(obj) == 0 ||
3858                      lfsck_is_dead_obj(obj)))
3859                 GOTO(unlock, rc = 0);
3860
3861         th = dt_trans_create(env, dev);
3862         if (IS_ERR(th))
3863                 GOTO(unlock, rc = PTR_ERR(th));
3864
3865         rc = dt_declare_xattr_set(env, obj, buf, XATTR_NAME_FID, 0, th);
3866         if (rc != 0)
3867                 GOTO(stop, rc);
3868
3869         rc = dt_trans_start_local(env, dev, th);
3870         if (rc != 0)
3871                 GOTO(stop, rc);
3872
3873         rc = dt_xattr_set(env, obj, buf, XATTR_NAME_FID, 0, th, BYPASS_CAPA);
3874
3875         GOTO(stop, rc);
3876
3877 stop:
3878         dt_trans_stop(env, dev, th);
3879
3880 unlock:
3881         dt_write_unlock(env, obj);
3882         lu_object_put(env, &obj->do_lu);
3883
3884 log:
3885         CDEBUG(D_LFSCK, "%s: layout LFSCK slave repaired pfid for "DFID
3886                ", parent "DFID": rc = %d\n", lfsck_lfsck2name(com->lc_lfsck),
3887                PFID(&lr->lr_fid), PFID(&lr->lr_fid2), rc);
3888
3889         return rc;
3890 }
3891
3892 /* layout APIs */
3893
3894 static void lfsck_layout_slave_quit(const struct lu_env *env,
3895                                     struct lfsck_component *com);
3896
3897 static int lfsck_layout_reset(const struct lu_env *env,
3898                               struct lfsck_component *com, bool init)
3899 {
3900         struct lfsck_layout     *lo    = com->lc_file_ram;
3901         int                      rc;
3902
3903         down_write(&com->lc_sem);
3904         if (init) {
3905                 memset(lo, 0, com->lc_file_size);
3906         } else {
3907                 __u32 count = lo->ll_success_count;
3908                 __u64 last_time = lo->ll_time_last_complete;
3909
3910                 memset(lo, 0, com->lc_file_size);
3911                 lo->ll_success_count = count;
3912                 lo->ll_time_last_complete = last_time;
3913         }
3914
3915         lo->ll_magic = LFSCK_LAYOUT_MAGIC;
3916         lo->ll_status = LS_INIT;
3917
3918         if (com->lc_lfsck->li_master) {
3919                 struct lfsck_assistant_data *lad = com->lc_data;
3920
3921                 lad->lad_incomplete = 0;
3922                 CFS_RESET_BITMAP(lad->lad_bitmap);
3923         }
3924
3925         rc = lfsck_layout_store(env, com);
3926         up_write(&com->lc_sem);
3927
3928         CDEBUG(D_LFSCK, "%s: layout LFSCK reset: rc = %d\n",
3929                lfsck_lfsck2name(com->lc_lfsck), rc);
3930
3931         return rc;
3932 }
3933
3934 static void lfsck_layout_fail(const struct lu_env *env,
3935                               struct lfsck_component *com, bool new_checked)
3936 {
3937         struct lfsck_layout *lo = com->lc_file_ram;
3938
3939         down_write(&com->lc_sem);
3940         if (new_checked)
3941                 com->lc_new_checked++;
3942         lfsck_layout_record_failure(env, com->lc_lfsck, lo);
3943         up_write(&com->lc_sem);
3944 }
3945
3946 static int lfsck_layout_master_checkpoint(const struct lu_env *env,
3947                                           struct lfsck_component *com, bool init)
3948 {
3949         struct lfsck_instance   *lfsck   = com->lc_lfsck;
3950         struct lfsck_layout     *lo      = com->lc_file_ram;
3951         int                      rc;
3952
3953         if (!init) {
3954                 rc = lfsck_checkpoint_generic(env, com);
3955                 if (rc != 0)
3956                         return rc > 0 ? 0 : rc;
3957         }
3958
3959         down_write(&com->lc_sem);
3960         if (init) {
3961                 lo->ll_pos_latest_start =
3962                                 lfsck->li_pos_checkpoint.lp_oit_cookie;
3963         } else {
3964                 lo->ll_pos_last_checkpoint =
3965                                 lfsck->li_pos_checkpoint.lp_oit_cookie;
3966                 lo->ll_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
3967                                 HALF_SEC - lfsck->li_time_last_checkpoint);
3968                 lo->ll_time_last_checkpoint = cfs_time_current_sec();
3969                 lo->ll_objs_checked_phase1 += com->lc_new_checked;
3970                 com->lc_new_checked = 0;
3971         }
3972
3973         rc = lfsck_layout_store(env, com);
3974         up_write(&com->lc_sem);
3975
3976         CDEBUG(D_LFSCK, "%s: layout LFSCK master checkpoint at the pos ["
3977                LPU64"]: rc = %d\n", lfsck_lfsck2name(lfsck),
3978                lfsck->li_pos_current.lp_oit_cookie, rc);
3979
3980         return rc;
3981 }
3982
3983 static int lfsck_layout_slave_checkpoint(const struct lu_env *env,
3984                                          struct lfsck_component *com, bool init)
3985 {
3986         struct lfsck_instance   *lfsck = com->lc_lfsck;
3987         struct lfsck_layout     *lo    = com->lc_file_ram;
3988         int                      rc;
3989
3990         if (com->lc_new_checked == 0 && !init)
3991                 return 0;
3992
3993         down_write(&com->lc_sem);
3994         if (init) {
3995                 lo->ll_pos_latest_start =
3996                                 lfsck->li_pos_checkpoint.lp_oit_cookie;
3997         } else {
3998                 lo->ll_pos_last_checkpoint =
3999                                 lfsck->li_pos_checkpoint.lp_oit_cookie;
4000                 lo->ll_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
4001                                 HALF_SEC - lfsck->li_time_last_checkpoint);
4002                 lo->ll_time_last_checkpoint = cfs_time_current_sec();
4003                 lo->ll_objs_checked_phase1 += com->lc_new_checked;
4004                 com->lc_new_checked = 0;
4005         }
4006
4007         rc = lfsck_layout_store(env, com);
4008         up_write(&com->lc_sem);
4009
4010         CDEBUG(D_LFSCK, "%s: layout LFSCK slave checkpoint at the pos ["
4011                LPU64"]: rc = %d\n", lfsck_lfsck2name(lfsck),
4012                lfsck->li_pos_current.lp_oit_cookie, rc);
4013
4014         return rc;
4015 }
4016
4017 static int lfsck_layout_prep(const struct lu_env *env,
4018                              struct lfsck_component *com,
4019                              struct lfsck_start *start)
4020 {
4021         struct lfsck_instance   *lfsck  = com->lc_lfsck;
4022         struct lfsck_layout     *lo     = com->lc_file_ram;
4023         struct lfsck_position   *pos    = &com->lc_pos_start;
4024
4025         fid_zero(&pos->lp_dir_parent);
4026         pos->lp_dir_cookie = 0;
4027         if (lo->ll_status == LS_COMPLETED ||
4028             lo->ll_status == LS_PARTIAL ||
4029             /* To handle orphan, must scan from the beginning. */
4030             (start != NULL && start->ls_flags & LPF_OST_ORPHAN)) {
4031                 int rc;
4032
4033                 rc = lfsck_layout_reset(env, com, false);
4034                 if (rc == 0)
4035                         rc = lfsck_set_param(env, lfsck, start, true);
4036
4037                 if (rc != 0) {
4038                         CDEBUG(D_LFSCK, "%s: layout LFSCK prep failed: "
4039                                "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
4040
4041                         return rc;
4042                 }
4043         }
4044
4045         down_write(&com->lc_sem);
4046         lo->ll_time_latest_start = cfs_time_current_sec();
4047         spin_lock(&lfsck->li_lock);
4048         if (lo->ll_flags & LF_SCANNED_ONCE) {
4049                 if (!lfsck->li_drop_dryrun ||
4050                     lo->ll_pos_first_inconsistent == 0) {
4051                         lo->ll_status = LS_SCANNING_PHASE2;
4052                         list_move_tail(&com->lc_link,
4053                                        &lfsck->li_list_double_scan);
4054                         pos->lp_oit_cookie = 0;
4055                 } else {
4056                         int i;
4057
4058                         lo->ll_status = LS_SCANNING_PHASE1;
4059                         lo->ll_run_time_phase1 = 0;
4060                         lo->ll_run_time_phase2 = 0;
4061                         lo->ll_objs_checked_phase1 = 0;
4062                         lo->ll_objs_checked_phase2 = 0;
4063                         lo->ll_objs_failed_phase1 = 0;
4064                         lo->ll_objs_failed_phase2 = 0;
4065                         for (i = 0; i < LLIT_MAX; i++)
4066                                 lo->ll_objs_repaired[i] = 0;
4067
4068                         pos->lp_oit_cookie = lo->ll_pos_first_inconsistent;
4069                         fid_zero(&com->lc_fid_latest_scanned_phase2);
4070                 }
4071         } else {
4072                 lo->ll_status = LS_SCANNING_PHASE1;
4073                 if (!lfsck->li_drop_dryrun ||
4074                     lo->ll_pos_first_inconsistent == 0)
4075                         pos->lp_oit_cookie = lo->ll_pos_last_checkpoint + 1;
4076                 else
4077                         pos->lp_oit_cookie = lo->ll_pos_first_inconsistent;
4078         }
4079         spin_unlock(&lfsck->li_lock);
4080         up_write(&com->lc_sem);
4081
4082         return 0;
4083 }
4084
4085 static int lfsck_layout_slave_prep(const struct lu_env *env,
4086                                    struct lfsck_component *com,
4087                                    struct lfsck_start_param *lsp)
4088 {
4089         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
4090         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4091         struct lfsck_layout             *lo     = com->lc_file_ram;
4092         struct lfsck_start              *start  = lsp->lsp_start;
4093         int                              rc;
4094
4095         rc = lfsck_layout_prep(env, com, start);
4096         if (rc != 0)
4097                 return rc;
4098
4099         if (lo->ll_flags & LF_CRASHED_LASTID &&
4100             list_empty(&llsd->llsd_master_list)) {
4101                 LASSERT(lfsck->li_out_notify != NULL);
4102
4103                 lfsck->li_out_notify(env, lfsck->li_out_notify_data,
4104                                      LE_LASTID_REBUILDING);
4105         }
4106
4107         if (!lsp->lsp_index_valid)
4108                 return 0;
4109
4110         rc = lfsck_layout_llst_add(llsd, lsp->lsp_index);
4111         if (rc == 0 && start != NULL && start->ls_flags & LPF_OST_ORPHAN) {
4112                 LASSERT(!llsd->llsd_rbtree_valid);
4113
4114                 write_lock(&llsd->llsd_rb_lock);
4115                 rc = lfsck_rbtree_setup(env, com);
4116                 write_unlock(&llsd->llsd_rb_lock);
4117         }
4118
4119         CDEBUG(D_LFSCK, "%s: layout LFSCK slave prep done, start pos ["
4120                LPU64"]\n", lfsck_lfsck2name(lfsck),
4121                com->lc_pos_start.lp_oit_cookie);
4122
4123         return rc;
4124 }
4125
4126 static int lfsck_layout_master_prep(const struct lu_env *env,
4127                                     struct lfsck_component *com,
4128                                     struct lfsck_start_param *lsp)
4129 {
4130         int rc;
4131         ENTRY;
4132
4133         rc = lfsck_layout_load_bitmap(env, com);
4134         if (rc != 0) {
4135                 rc = lfsck_layout_reset(env, com, false);
4136                 if (rc == 0)
4137                         rc = lfsck_set_param(env, com->lc_lfsck,
4138                                              lsp->lsp_start, true);
4139
4140                 if (rc != 0)
4141                         GOTO(log, rc);
4142         }
4143
4144         rc = lfsck_layout_prep(env, com, lsp->lsp_start);
4145         if (rc != 0)
4146                 RETURN(rc);
4147
4148         rc = lfsck_start_assistant(env, com, lsp);
4149
4150         GOTO(log, rc);
4151
4152 log:
4153         CDEBUG(D_LFSCK, "%s: layout LFSCK master prep done, start pos ["
4154                LPU64"]\n", lfsck_lfsck2name(com->lc_lfsck),
4155                com->lc_pos_start.lp_oit_cookie);
4156
4157         return 0;
4158 }
4159
4160 /* Pre-fetch the attribute for each stripe in the given layout EA. */
4161 static int lfsck_layout_scan_stripes(const struct lu_env *env,
4162                                      struct lfsck_component *com,
4163                                      struct dt_object *parent,
4164                                      struct lov_mds_md_v1 *lmm)
4165 {
4166         struct lfsck_thread_info        *info    = lfsck_env_info(env);
4167         struct lfsck_instance           *lfsck   = com->lc_lfsck;
4168         struct lfsck_bookmark           *bk      = &lfsck->li_bookmark_ram;
4169         struct lfsck_layout             *lo      = com->lc_file_ram;
4170         struct lfsck_assistant_data     *lad     = com->lc_data;
4171         struct lfsck_layout_object      *llo     = NULL;
4172         struct lov_ost_data_v1          *objs;
4173         struct lfsck_tgt_descs          *ltds    = &lfsck->li_ost_descs;
4174         struct ptlrpc_thread            *mthread = &lfsck->li_thread;
4175         struct ptlrpc_thread            *athread = &lad->lad_thread;
4176         struct l_wait_info               lwi     = { 0 };
4177         struct lu_buf                    buf;
4178         int                              rc      = 0;
4179         int                              i;
4180         __u32                            magic;
4181         __u16                            count;
4182         __u16                            gen;
4183         ENTRY;
4184
4185         lfsck_buf_init(&buf, &info->lti_old_pfid,
4186                        sizeof(struct filter_fid_old));
4187         count = le16_to_cpu(lmm->lmm_stripe_count);
4188         gen = le16_to_cpu(lmm->lmm_layout_gen);
4189         /* Currently, we only support LOV_MAGIC_V1/LOV_MAGIC_V3 which has
4190          * been verified in lfsck_layout_verify_header() already. If some
4191          * new magic introduced in the future, then layout LFSCK needs to
4192          * be updated also. */
4193         magic = le32_to_cpu(lmm->lmm_magic);
4194         if (magic == LOV_MAGIC_V1) {
4195                 objs = &lmm->lmm_objects[0];
4196         } else {
4197                 LASSERT(magic == LOV_MAGIC_V3);
4198                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
4199         }
4200
4201         for (i = 0; i < count; i++, objs++) {
4202                 struct lu_fid           *fid    = &info->lti_fid;
4203                 struct ost_id           *oi     = &info->lti_oi;
4204                 struct lfsck_layout_req *llr;
4205                 struct lfsck_tgt_desc   *tgt    = NULL;
4206                 struct dt_object        *cobj   = NULL;
4207                 __u32                    index;
4208                 bool                     wakeup = false;
4209
4210                 if (unlikely(lovea_slot_is_dummy(objs)))
4211                         continue;
4212
4213                 l_wait_event(mthread->t_ctl_waitq,
4214                              bk->lb_async_windows == 0 ||
4215                              lad->lad_prefetched < bk->lb_async_windows ||
4216                              !thread_is_running(mthread) ||
4217                              thread_is_stopped(athread),
4218                              &lwi);
4219
4220                 if (unlikely(!thread_is_running(mthread)) ||
4221                              thread_is_stopped(athread))
4222                         GOTO(out, rc = 0);
4223
4224                 if (unlikely(lfsck_is_dead_obj(parent)))
4225                         GOTO(out, rc = 0);
4226
4227                 ostid_le_to_cpu(&objs->l_ost_oi, oi);
4228                 index = le32_to_cpu(objs->l_ost_idx);
4229                 rc = ostid_to_fid(fid, oi, index);
4230                 if (rc != 0) {
4231                         CDEBUG(D_LFSCK, "%s: get invalid layout EA for "DFID
4232                                ": "DOSTID", idx:%u\n", lfsck_lfsck2name(lfsck),
4233                                PFID(lfsck_dto2fid(parent)), POSTID(oi), index);
4234                         goto next;
4235                 }
4236
4237                 tgt = lfsck_tgt_get(ltds, index);
4238                 if (unlikely(tgt == NULL)) {
4239                         CDEBUG(D_LFSCK, "%s: cannot talk with OST %x which "
4240                                "did not join the layout LFSCK\n",
4241                                lfsck_lfsck2name(lfsck), index);
4242                         lfsck_lad_set_bitmap(env, com, index);
4243                         goto next;
4244                 }
4245
4246                 /* There is potential deadlock race condition between object
4247                  * destroy and layout LFSCK. Consider the following scenario:
4248                  *
4249                  * 1) The LFSCK thread obtained the parent object firstly, at
4250                  *    that time, the parent object has not been destroyed yet.
4251                  *
4252                  * 2) One RPC service thread destroyed the parent and all its
4253                  *    children objects. Because the LFSCK is referencing the
4254                  *    parent object, then the parent object will be marked as
4255                  *    dying in RAM. On the other hand, the parent object is
4256                  *    referencing all its children objects, then all children
4257                  *    objects will be marked as dying in RAM also.
4258                  *
4259                  * 3) The LFSCK thread tries to find some child object with
4260                  *    the parent object referenced. Then it will find that the
4261                  *    child object is dying. According to the object visibility
4262                  *    rules: the object with dying flag cannot be returned to
4263                  *    others. So the LFSCK thread has to wait until the dying
4264                  *    object has been purged from RAM, then it can allocate a
4265                  *    new object (with the same FID) in RAM. Unfortunately, the
4266                  *    LFSCK thread itself is referencing the parent object, and
4267                  *    cause the parent object cannot be purged, then cause the
4268                  *    child object cannot be purged also. So the LFSCK thread
4269                  *    will fall into deadlock.
4270                  *
4271                  * We introduce non-blocked version lu_object_find() to allow
4272                  * the LFSCK thread to return failure immediately (instead of
4273                  * wait) when it finds dying (child) object, then the LFSCK
4274                  * thread can check whether the parent object is dying or not.
4275                  * So avoid above deadlock. LU-5395 */
4276                 cobj = lfsck_object_find_by_dev_nowait(env, tgt->ltd_tgt, fid);
4277                 if (IS_ERR(cobj)) {
4278                         if (lfsck_is_dead_obj(parent)) {
4279                                 lfsck_tgt_put(tgt);
4280
4281                                 GOTO(out, rc = 0);
4282                         }
4283
4284                         rc = PTR_ERR(cobj);
4285                         goto next;
4286                 }
4287
4288                 rc = dt_declare_attr_get(env, cobj, BYPASS_CAPA);
4289                 if (rc != 0)
4290                         goto next;
4291
4292                 rc = dt_declare_xattr_get(env, cobj, &buf, XATTR_NAME_FID,
4293                                           BYPASS_CAPA);
4294                 if (rc != 0)
4295                         goto next;
4296
4297                 if (llo == NULL) {
4298                         llo = lfsck_layout_object_init(env, parent,
4299                                 lfsck->li_pos_current.lp_oit_cookie, gen);
4300                         if (IS_ERR(llo)) {
4301                                 rc = PTR_ERR(llo);
4302                                 goto next;
4303                         }
4304                 }
4305
4306                 llr = lfsck_layout_assistant_req_init(llo,
4307                                                       lfsck_dto2fid(parent),
4308                                                       cobj, index, i);
4309                 if (IS_ERR(llr)) {
4310                         rc = PTR_ERR(llr);
4311                         goto next;
4312                 }
4313
4314                 cobj = NULL;
4315                 spin_lock(&lad->lad_lock);
4316                 if (lad->lad_assistant_status < 0) {
4317                         spin_unlock(&lad->lad_lock);
4318                         lfsck_layout_assistant_req_fini(env, &llr->llr_lar);
4319                         lfsck_tgt_put(tgt);
4320                         RETURN(lad->lad_assistant_status);
4321                 }
4322
4323                 list_add_tail(&llr->llr_lar.lar_list, &lad->lad_req_list);
4324                 if (lad->lad_prefetched == 0)
4325                         wakeup = true;
4326
4327                 lad->lad_prefetched++;
4328                 spin_unlock(&lad->lad_lock);
4329                 if (wakeup)
4330                         wake_up_all(&athread->t_ctl_waitq);
4331
4332 next:
4333                 down_write(&com->lc_sem);
4334                 com->lc_new_checked++;
4335                 if (rc < 0)
4336                         lfsck_layout_record_failure(env, lfsck, lo);
4337                 up_write(&com->lc_sem);
4338
4339                 if (cobj != NULL && !IS_ERR(cobj))
4340                         lu_object_put(env, &cobj->do_lu);
4341
4342                 if (likely(tgt != NULL))
4343                         lfsck_tgt_put(tgt);
4344
4345                 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
4346                         GOTO(out, rc);
4347         }
4348
4349         GOTO(out, rc = 0);
4350
4351 out:
4352         if (llo != NULL && !IS_ERR(llo))
4353                 lfsck_layout_object_put(env, llo);
4354
4355         return rc;
4356 }
4357
4358 /* For the given object, read its layout EA locally. For each stripe, pre-fetch
4359  * the OST-object's attribute and generate an structure lfsck_layout_req on the
4360  * list ::lad_req_list.
4361  *
4362  * For each request on above list, the lfsck_layout_assistant thread compares
4363  * the OST side attribute with local attribute, if inconsistent, then repair it.
4364  *
4365  * All above processing is async mode with pipeline. */
4366 static int lfsck_layout_master_exec_oit(const struct lu_env *env,
4367                                         struct lfsck_component *com,
4368                                         struct dt_object *obj)
4369 {
4370         struct lfsck_thread_info        *info   = lfsck_env_info(env);
4371         struct ost_id                   *oi     = &info->lti_oi;
4372         struct lfsck_layout             *lo     = com->lc_file_ram;
4373         struct lfsck_assistant_data     *lad    = com->lc_data;
4374         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4375         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
4376         struct thandle                  *handle = NULL;
4377         struct lu_buf                   *buf    = &info->lti_big_buf;
4378         struct lov_mds_md_v1            *lmm    = NULL;
4379         struct dt_device                *dev    = lfsck->li_bottom;
4380         struct lustre_handle             lh     = { 0 };
4381         struct lu_buf                    ea_buf = { NULL };
4382         int                              rc     = 0;
4383         int                              size   = 0;
4384         bool                             locked = false;
4385         bool                             stripe = false;
4386         bool                             bad_oi = false;
4387         ENTRY;
4388
4389         if (!S_ISREG(lfsck_object_type(obj)))
4390                 GOTO(out, rc = 0);
4391
4392         if (lad->lad_assistant_status < 0)
4393                 GOTO(out, rc = -ESRCH);
4394
4395         fid_to_lmm_oi(lfsck_dto2fid(obj), oi);
4396         lmm_oi_cpu_to_le(oi, oi);
4397         dt_read_lock(env, obj, 0);
4398         locked = true;
4399
4400 again:
4401         if (dt_object_exists(obj) == 0 ||
4402             lfsck_is_dead_obj(obj))
4403                 GOTO(out, rc = 0);
4404
4405         rc = lfsck_layout_get_lovea(env, obj, buf);
4406         if (rc <= 0)
4407                 GOTO(out, rc);
4408
4409         size = rc;
4410         lmm = buf->lb_buf;
4411         rc = lfsck_layout_verify_header(lmm);
4412         /* If the LOV EA crashed, then it is possible to be rebuilt later
4413          * when handle orphan OST-objects. */
4414         if (rc != 0)
4415                 GOTO(out, rc);
4416
4417         if (memcmp(oi, &lmm->lmm_oi, sizeof(*oi)) == 0)
4418                 GOTO(out, stripe = true);
4419
4420         /* Inconsistent lmm_oi, should be repaired. */
4421         bad_oi = true;
4422         lmm->lmm_oi = *oi;
4423
4424         if (bk->lb_param & LPF_DRYRUN) {
4425                 lo->ll_objs_repaired[LLIT_OTHERS - 1]++;
4426
4427                 GOTO(out, stripe = true);
4428         }
4429
4430         if (!lustre_handle_is_used(&lh)) {
4431                 dt_read_unlock(env, obj);
4432                 locked = false;
4433                 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
4434                                       MDS_INODELOCK_LAYOUT |
4435                                       MDS_INODELOCK_XATTR, LCK_EX);
4436                 if (rc != 0)
4437                         GOTO(out, rc);
4438
4439                 handle = dt_trans_create(env, dev);
4440                 if (IS_ERR(handle))
4441                         GOTO(out, rc = PTR_ERR(handle));
4442
4443                 lfsck_buf_init(&ea_buf, lmm, size);
4444                 rc = dt_declare_xattr_set(env, obj, &ea_buf, XATTR_NAME_LOV,
4445                                           LU_XATTR_REPLACE, handle);
4446                 if (rc != 0)
4447                         GOTO(out, rc);
4448
4449                 rc = dt_trans_start_local(env, dev, handle);
4450                 if (rc != 0)
4451                         GOTO(out, rc);
4452
4453                 dt_write_lock(env, obj, 0);
4454                 locked = true;
4455
4456                 goto again;
4457         }
4458
4459         rc = dt_xattr_set(env, obj, &ea_buf, XATTR_NAME_LOV,
4460                           LU_XATTR_REPLACE, handle, BYPASS_CAPA);
4461         if (rc != 0)
4462                 GOTO(out, rc);
4463
4464         lo->ll_objs_repaired[LLIT_OTHERS - 1]++;
4465
4466         GOTO(out, stripe = true);
4467
4468 out:
4469         if (locked) {
4470                 if (lustre_handle_is_used(&lh))
4471                         dt_write_unlock(env, obj);
4472                 else
4473                         dt_read_unlock(env, obj);
4474         }
4475
4476         if (handle != NULL && !IS_ERR(handle))
4477                 dt_trans_stop(env, dev, handle);
4478
4479         lfsck_ibits_unlock(&lh, LCK_EX);
4480
4481         if (bad_oi)
4482                 CDEBUG(D_LFSCK, "%s: layout LFSCK master %s bad lmm_oi for "
4483                        DFID": rc = %d\n", lfsck_lfsck2name(lfsck),
4484                        bk->lb_param & LPF_DRYRUN ? "found" : "repaired",
4485                        PFID(lfsck_dto2fid(obj)), rc);
4486
4487         if (stripe) {
4488                 rc = lfsck_layout_scan_stripes(env, com, obj, lmm);
4489         } else {
4490                 down_write(&com->lc_sem);
4491                 com->lc_new_checked++;
4492                 if (rc < 0)
4493                         lfsck_layout_record_failure(env, lfsck, lo);
4494                 up_write(&com->lc_sem);
4495         }
4496
4497         return rc;
4498 }
4499
4500 static int lfsck_layout_slave_exec_oit(const struct lu_env *env,
4501                                        struct lfsck_component *com,
4502                                        struct dt_object *obj)
4503 {
4504         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4505         struct lfsck_layout             *lo     = com->lc_file_ram;
4506         const struct lu_fid             *fid    = lfsck_dto2fid(obj);
4507         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
4508         struct lfsck_layout_seq         *lls;
4509         __u64                            seq;
4510         __u64                            oid;
4511         int                              rc;
4512         ENTRY;
4513
4514         LASSERT(llsd != NULL);
4515
4516         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_DELAY5) &&
4517             cfs_fail_val == lfsck_dev_idx(lfsck->li_bottom)) {
4518                 struct l_wait_info       lwi = LWI_TIMEOUT(cfs_time_seconds(1),
4519                                                            NULL, NULL);
4520                 struct ptlrpc_thread    *thread = &lfsck->li_thread;
4521
4522                 l_wait_event(thread->t_ctl_waitq,
4523                              !thread_is_running(thread),
4524                              &lwi);
4525         }
4526
4527         lfsck_rbtree_update_bitmap(env, com, fid, false);
4528
4529         down_write(&com->lc_sem);
4530         if (fid_is_idif(fid))
4531                 seq = 0;
4532         else if (!fid_is_norm(fid) ||
4533                  !fid_is_for_ostobj(env, lfsck->li_next, obj, fid))
4534                 GOTO(unlock, rc = 0);
4535         else
4536                 seq = fid_seq(fid);
4537         com->lc_new_checked++;
4538
4539         lls = lfsck_layout_seq_lookup(llsd, seq);
4540         if (lls == NULL) {
4541                 OBD_ALLOC_PTR(lls);
4542                 if (unlikely(lls == NULL))
4543                         GOTO(unlock, rc = -ENOMEM);
4544
4545                 INIT_LIST_HEAD(&lls->lls_list);
4546                 lls->lls_seq = seq;
4547                 rc = lfsck_layout_lastid_load(env, com, lls);
4548                 if (rc != 0) {
4549                         CDEBUG(D_LFSCK, "%s: layout LFSCK failed to "
4550                               "load LAST_ID for "LPX64": rc = %d\n",
4551                               lfsck_lfsck2name(com->lc_lfsck), seq, rc);
4552                         lo->ll_objs_failed_phase1++;
4553                         OBD_FREE_PTR(lls);
4554                         GOTO(unlock, rc);
4555                 }
4556
4557                 lfsck_layout_seq_insert(llsd, lls);
4558         }
4559
4560         if (unlikely(fid_is_last_id(fid)))
4561                 GOTO(unlock, rc = 0);
4562
4563         if (fid_is_idif(fid))
4564                 oid = fid_idif_id(fid_seq(fid), fid_oid(fid), fid_ver(fid));
4565         else
4566                 oid = fid_oid(fid);
4567
4568         if (oid > lls->lls_lastid_known)
4569                 lls->lls_lastid_known = oid;
4570
4571         if (oid > lls->lls_lastid) {
4572                 if (!(lo->ll_flags & LF_CRASHED_LASTID)) {
4573                         /* OFD may create new objects during LFSCK scanning. */
4574                         rc = lfsck_layout_lastid_reload(env, com, lls);
4575                         if (unlikely(rc != 0)) {
4576                                 CDEBUG(D_LFSCK, "%s: layout LFSCK failed to "
4577                                       "reload LAST_ID for "LPX64": rc = %d\n",
4578                                       lfsck_lfsck2name(com->lc_lfsck),
4579                                       lls->lls_seq, rc);
4580
4581                                 GOTO(unlock, rc);
4582                         }
4583
4584                         if (oid <= lls->lls_lastid ||
4585                             lo->ll_flags & LF_CRASHED_LASTID)
4586                                 GOTO(unlock, rc = 0);
4587
4588                         LASSERT(lfsck->li_out_notify != NULL);
4589
4590                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
4591                                              LE_LASTID_REBUILDING);
4592                         lo->ll_flags |= LF_CRASHED_LASTID;
4593
4594                         CDEBUG(D_LFSCK, "%s: layout LFSCK finds crashed "
4595                                "LAST_ID file (2) for the sequence "LPX64
4596                                ", old value "LPU64", known value "LPU64"\n",
4597                                lfsck_lfsck2name(lfsck), lls->lls_seq,
4598                                lls->lls_lastid, oid);
4599                 }
4600
4601                 lls->lls_lastid = oid;
4602                 lls->lls_dirty = 1;
4603         }
4604
4605         GOTO(unlock, rc = 0);
4606
4607 unlock:
4608         up_write(&com->lc_sem);
4609
4610         return rc;
4611 }
4612
4613 static int lfsck_layout_exec_dir(const struct lu_env *env,
4614                                  struct lfsck_component *com,
4615                                  struct lu_dirent *ent, __u16 type)
4616 {
4617         return 0;
4618 }
4619
4620 static int lfsck_layout_master_post(const struct lu_env *env,
4621                                     struct lfsck_component *com,
4622                                     int result, bool init)
4623 {
4624         struct lfsck_instance   *lfsck  = com->lc_lfsck;
4625         struct lfsck_layout     *lo     = com->lc_file_ram;
4626         int                      rc;
4627         ENTRY;
4628
4629         lfsck_post_generic(env, com, &result);
4630
4631         down_write(&com->lc_sem);
4632         spin_lock(&lfsck->li_lock);
4633         if (!init)
4634                 lo->ll_pos_last_checkpoint =
4635                                 lfsck->li_pos_checkpoint.lp_oit_cookie;
4636
4637         if (result > 0) {
4638                 if (lo->ll_flags & LF_INCOMPLETE)
4639                         lo->ll_status = LS_PARTIAL;
4640                 else
4641                         lo->ll_status = LS_SCANNING_PHASE2;
4642                 lo->ll_flags |= LF_SCANNED_ONCE;
4643                 lo->ll_flags &= ~LF_UPGRADE;
4644                 list_move_tail(&com->lc_link, &lfsck->li_list_double_scan);
4645         } else if (result == 0) {
4646                 if (lfsck->li_status != 0)
4647                         lo->ll_status = lfsck->li_status;
4648                 else
4649                         lo->ll_status = LS_STOPPED;
4650                 if (lo->ll_status != LS_PAUSED)
4651                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4652         } else {
4653                 lo->ll_status = LS_FAILED;
4654                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4655         }
4656         spin_unlock(&lfsck->li_lock);
4657
4658         if (!init) {
4659                 lo->ll_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
4660                                 HALF_SEC - lfsck->li_time_last_checkpoint);
4661                 lo->ll_time_last_checkpoint = cfs_time_current_sec();
4662                 lo->ll_objs_checked_phase1 += com->lc_new_checked;
4663                 com->lc_new_checked = 0;
4664         }
4665
4666         rc = lfsck_layout_store(env, com);
4667         up_write(&com->lc_sem);
4668
4669         CDEBUG(D_LFSCK, "%s: layout LFSCK master post done: rc = %d\n",
4670                lfsck_lfsck2name(lfsck), rc);
4671
4672         RETURN(rc);
4673 }
4674
4675 static int lfsck_layout_slave_post(const struct lu_env *env,
4676                                    struct lfsck_component *com,
4677                                    int result, bool init)
4678 {
4679         struct lfsck_instance   *lfsck = com->lc_lfsck;
4680         struct lfsck_layout     *lo    = com->lc_file_ram;
4681         int                      rc;
4682         bool                     done  = false;
4683
4684         rc = lfsck_layout_lastid_store(env, com);
4685         if (rc != 0)
4686                 result = rc;
4687
4688         LASSERT(lfsck->li_out_notify != NULL);
4689
4690         down_write(&com->lc_sem);
4691         spin_lock(&lfsck->li_lock);
4692         if (!init)
4693                 lo->ll_pos_last_checkpoint =
4694                                 lfsck->li_pos_checkpoint.lp_oit_cookie;
4695
4696         if (result > 0) {
4697                 lo->ll_status = LS_SCANNING_PHASE2;
4698                 lo->ll_flags |= LF_SCANNED_ONCE;
4699                 if (lo->ll_flags & LF_CRASHED_LASTID) {
4700                         done = true;
4701                         lo->ll_flags &= ~LF_CRASHED_LASTID;
4702
4703                         CDEBUG(D_LFSCK, "%s: layout LFSCK has rebuilt "
4704                                "crashed LAST_ID files successfully\n",
4705                                lfsck_lfsck2name(lfsck));
4706                 }
4707                 lo->ll_flags &= ~LF_UPGRADE;
4708                 list_move_tail(&com->lc_link, &lfsck->li_list_double_scan);
4709         } else if (result == 0) {
4710                 if (lfsck->li_status != 0)
4711                         lo->ll_status = lfsck->li_status;
4712                 else
4713                         lo->ll_status = LS_STOPPED;
4714                 if (lo->ll_status != LS_PAUSED)
4715                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4716         } else {
4717                 lo->ll_status = LS_FAILED;
4718                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4719         }
4720         spin_unlock(&lfsck->li_lock);
4721
4722         if (done)
4723                 lfsck->li_out_notify(env, lfsck->li_out_notify_data,
4724                                      LE_LASTID_REBUILT);
4725
4726         if (!init) {
4727                 lo->ll_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
4728                                 HALF_SEC - lfsck->li_time_last_checkpoint);
4729                 lo->ll_time_last_checkpoint = cfs_time_current_sec();
4730                 lo->ll_objs_checked_phase1 += com->lc_new_checked;
4731                 com->lc_new_checked = 0;
4732         }
4733
4734         rc = lfsck_layout_store(env, com);
4735         up_write(&com->lc_sem);
4736
4737         lfsck_layout_slave_notify_master(env, com, LE_PHASE1_DONE, result);
4738
4739         CDEBUG(D_LFSCK, "%s: layout LFSCK slave post done: rc = %d\n",
4740                lfsck_lfsck2name(lfsck), rc);
4741
4742         return rc;
4743 }
4744
4745 static int lfsck_layout_dump(const struct lu_env *env,
4746                              struct lfsck_component *com, struct seq_file *m)
4747 {
4748         struct lfsck_instance   *lfsck = com->lc_lfsck;
4749         struct lfsck_bookmark   *bk    = &lfsck->li_bookmark_ram;
4750         struct lfsck_layout     *lo    = com->lc_file_ram;
4751         int                      rc;
4752
4753         down_read(&com->lc_sem);
4754         seq_printf(m, "name: lfsck_layout\n"
4755                       "magic: %#x\n"
4756                       "version: %d\n"
4757                       "status: %s\n",
4758                       lo->ll_magic,
4759                       bk->lb_version,
4760                       lfsck_status2names(lo->ll_status));
4761
4762         rc = lfsck_bits_dump(m, lo->ll_flags, lfsck_flags_names, "flags");
4763         if (rc < 0)
4764                 goto out;
4765
4766         rc = lfsck_bits_dump(m, bk->lb_param, lfsck_param_names, "param");
4767         if (rc < 0)
4768                 goto out;
4769
4770         rc = lfsck_time_dump(m, lo->ll_time_last_complete,
4771                              "time_since_last_completed");
4772         if (rc < 0)
4773                 goto out;
4774
4775         rc = lfsck_time_dump(m, lo->ll_time_latest_start,
4776                              "time_since_latest_start");
4777         if (rc < 0)
4778                 goto out;
4779
4780         rc = lfsck_time_dump(m, lo->ll_time_last_checkpoint,
4781                              "time_since_last_checkpoint");
4782         if (rc < 0)
4783                 goto out;
4784
4785         seq_printf(m, "latest_start_position: "LPU64"\n"
4786                       "last_checkpoint_position: "LPU64"\n"
4787                       "first_failure_position: "LPU64"\n",
4788                       lo->ll_pos_latest_start,
4789                       lo->ll_pos_last_checkpoint,
4790                       lo->ll_pos_first_inconsistent);
4791
4792         seq_printf(m, "success_count: %u\n"
4793                       "repaired_dangling: "LPU64"\n"
4794                       "repaired_unmatched_pair: "LPU64"\n"
4795                       "repaired_multiple_referenced: "LPU64"\n"
4796                       "repaired_orphan: "LPU64"\n"
4797                       "repaired_inconsistent_owner: "LPU64"\n"
4798                       "repaired_others: "LPU64"\n"
4799                       "skipped: "LPU64"\n"
4800                       "failed_phase1: "LPU64"\n"
4801                       "failed_phase2: "LPU64"\n",
4802                       lo->ll_success_count,
4803                       lo->ll_objs_repaired[LLIT_DANGLING - 1],
4804                       lo->ll_objs_repaired[LLIT_UNMATCHED_PAIR - 1],
4805                       lo->ll_objs_repaired[LLIT_MULTIPLE_REFERENCED - 1],
4806                       lo->ll_objs_repaired[LLIT_ORPHAN - 1],
4807                       lo->ll_objs_repaired[LLIT_INCONSISTENT_OWNER - 1],
4808                       lo->ll_objs_repaired[LLIT_OTHERS - 1],
4809                       lo->ll_objs_skipped,
4810                       lo->ll_objs_failed_phase1,
4811                       lo->ll_objs_failed_phase2);
4812
4813         if (lo->ll_status == LS_SCANNING_PHASE1) {
4814                 __u64 pos;
4815                 const struct dt_it_ops *iops;
4816                 cfs_duration_t duration = cfs_time_current() -
4817                                           lfsck->li_time_last_checkpoint;
4818                 __u64 checked = lo->ll_objs_checked_phase1 +
4819                                 com->lc_new_checked;
4820                 __u64 speed = checked;
4821                 __u64 new_checked = com->lc_new_checked *
4822                                     msecs_to_jiffies(MSEC_PER_SEC);
4823                 __u32 rtime = lo->ll_run_time_phase1 +
4824                               cfs_duration_sec(duration + HALF_SEC);
4825
4826                 if (duration != 0)
4827                         do_div(new_checked, duration);
4828                 if (rtime != 0)
4829                         do_div(speed, rtime);
4830                 seq_printf(m, "checked_phase1: "LPU64"\n"
4831                               "checked_phase2: "LPU64"\n"
4832                               "run_time_phase1: %u seconds\n"
4833                               "run_time_phase2: %u seconds\n"
4834                               "average_speed_phase1: "LPU64" items/sec\n"
4835                               "average_speed_phase2: N/A\n"
4836                               "real-time_speed_phase1: "LPU64" items/sec\n"
4837                               "real-time_speed_phase2: N/A\n",
4838                               checked,
4839                               lo->ll_objs_checked_phase2,
4840                               rtime,
4841                               lo->ll_run_time_phase2,
4842                               speed,
4843                               new_checked);
4844
4845                 LASSERT(lfsck->li_di_oit != NULL);
4846
4847                 iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
4848
4849                 /* The low layer otable-based iteration position may NOT
4850                  * exactly match the layout-based directory traversal
4851                  * cookie. Generally, it is not a serious issue. But the
4852                  * caller should NOT make assumption on that. */
4853                 pos = iops->store(env, lfsck->li_di_oit);
4854                 if (!lfsck->li_current_oit_processed)
4855                         pos--;
4856                 seq_printf(m, "current_position: "LPU64"\n", pos);
4857
4858         } else if (lo->ll_status == LS_SCANNING_PHASE2) {
4859                 cfs_duration_t duration = cfs_time_current() -
4860                                           lfsck->li_time_last_checkpoint;
4861                 __u64 checked = lo->ll_objs_checked_phase2 +
4862                                 com->lc_new_checked;
4863                 __u64 speed1 = lo->ll_objs_checked_phase1;
4864                 __u64 speed2 = checked;
4865                 __u64 new_checked = com->lc_new_checked *
4866                                     msecs_to_jiffies(MSEC_PER_SEC);
4867                 __u32 rtime = lo->ll_run_time_phase2 +
4868                               cfs_duration_sec(duration + HALF_SEC);
4869
4870                 if (duration != 0)
4871                         do_div(new_checked, duration);
4872                 if (lo->ll_run_time_phase1 != 0)
4873                         do_div(speed1, lo->ll_run_time_phase1);
4874                 if (rtime != 0)
4875                         do_div(speed2, rtime);
4876                 rc = seq_printf(m, "checked_phase1: "LPU64"\n"
4877                                 "checked_phase2: "LPU64"\n"
4878                                 "run_time_phase1: %u seconds\n"
4879                                 "run_time_phase2: %u seconds\n"
4880                                 "average_speed_phase1: "LPU64" items/sec\n"
4881                                 "average_speed_phase2: "LPU64" items/sec\n"
4882                                 "real-time_speed_phase1: N/A\n"
4883                                 "real-time_speed_phase2: "LPU64" items/sec\n"
4884                                 "current_position: "DFID"\n",
4885                                 lo->ll_objs_checked_phase1,
4886                                 checked,
4887                                 lo->ll_run_time_phase1,
4888                                 rtime,
4889                                 speed1,
4890                                 speed2,
4891                                 new_checked,
4892                                 PFID(&com->lc_fid_latest_scanned_phase2));
4893                 if (rc <= 0)
4894                         goto out;
4895
4896         } else {
4897                 __u64 speed1 = lo->ll_objs_checked_phase1;
4898                 __u64 speed2 = lo->ll_objs_checked_phase2;
4899
4900                 if (lo->ll_run_time_phase1 != 0)
4901                         do_div(speed1, lo->ll_run_time_phase1);
4902                 if (lo->ll_run_time_phase2 != 0)
4903                         do_div(speed2, lo->ll_run_time_phase2);
4904                 seq_printf(m, "checked_phase1: "LPU64"\n"
4905                            "checked_phase2: "LPU64"\n"
4906                            "run_time_phase1: %u seconds\n"
4907                            "run_time_phase2: %u seconds\n"
4908                            "average_speed_phase1: "LPU64" items/sec\n"
4909                            "average_speed_phase2: "LPU64" objs/sec\n"
4910                            "real-time_speed_phase1: N/A\n"
4911                            "real-time_speed_phase2: N/A\n"
4912                            "current_position: N/A\n",
4913                            lo->ll_objs_checked_phase1,
4914                            lo->ll_objs_checked_phase2,
4915                            lo->ll_run_time_phase1,
4916                            lo->ll_run_time_phase2,
4917                            speed1,
4918                            speed2);
4919         }
4920 out:
4921         up_read(&com->lc_sem);
4922
4923         return rc;
4924 }
4925
4926 static int lfsck_layout_master_double_scan(const struct lu_env *env,
4927                                            struct lfsck_component *com)
4928 {
4929         struct lfsck_layout             *lo     = com->lc_file_ram;
4930         struct lfsck_assistant_data     *lad    = com->lc_data;
4931         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4932         struct lfsck_tgt_descs          *ltds;
4933         struct lfsck_tgt_desc           *ltd;
4934         struct lfsck_tgt_desc           *next;
4935         int                              rc;
4936
4937         rc = lfsck_double_scan_generic(env, com, lo->ll_status);
4938
4939         if (thread_is_stopped(&lad->lad_thread)) {
4940                 LASSERT(list_empty(&lad->lad_req_list));
4941                 LASSERT(list_empty(&lad->lad_ost_phase1_list));
4942                 LASSERT(list_empty(&lad->lad_mdt_phase1_list));
4943
4944                 ltds = &lfsck->li_ost_descs;
4945                 spin_lock(&ltds->ltd_lock);
4946                 list_for_each_entry_safe(ltd, next, &lad->lad_ost_phase2_list,
4947                                          ltd_layout_phase_list) {
4948                         list_del_init(&ltd->ltd_layout_phase_list);
4949                 }
4950                 spin_unlock(&ltds->ltd_lock);
4951
4952                 ltds = &lfsck->li_mdt_descs;
4953                 spin_lock(&ltds->ltd_lock);
4954                 list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
4955                                          ltd_layout_phase_list) {
4956                         list_del_init(&ltd->ltd_layout_phase_list);
4957                 }
4958                 spin_unlock(&ltds->ltd_lock);
4959         }
4960
4961         return rc;
4962 }
4963
4964 static int lfsck_layout_slave_double_scan(const struct lu_env *env,
4965                                           struct lfsck_component *com)
4966 {
4967         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4968         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
4969         struct lfsck_layout             *lo     = com->lc_file_ram;
4970         struct ptlrpc_thread            *thread = &lfsck->li_thread;
4971         int                              rc;
4972         ENTRY;
4973
4974         CDEBUG(D_LFSCK, "%s: layout LFSCK slave phase2 scan start\n",
4975                lfsck_lfsck2name(lfsck));
4976
4977         atomic_inc(&lfsck->li_double_scan_count);
4978
4979         if (lo->ll_flags & LF_INCOMPLETE)
4980                 GOTO(done, rc = 1);
4981
4982         com->lc_new_checked = 0;
4983         com->lc_new_scanned = 0;
4984         com->lc_time_last_checkpoint = cfs_time_current();
4985         com->lc_time_next_checkpoint = com->lc_time_last_checkpoint +
4986                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
4987
4988         while (1) {
4989                 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(30),
4990                                                      NULL, NULL);
4991
4992                 rc = lfsck_layout_slave_query_master(env, com);
4993                 if (list_empty(&llsd->llsd_master_list)) {
4994                         if (unlikely(!thread_is_running(thread)))
4995                                 rc = 0;
4996                         else
4997                                 rc = 1;
4998
4999                         GOTO(done, rc);
5000                 }
5001
5002                 if (rc < 0)
5003                         GOTO(done, rc);
5004
5005                 rc = l_wait_event(thread->t_ctl_waitq,
5006                                   !thread_is_running(thread) ||
5007                                   lo->ll_flags & LF_INCOMPLETE ||
5008                                   list_empty(&llsd->llsd_master_list),
5009                                   &lwi);
5010                 if (unlikely(!thread_is_running(thread)))
5011                         GOTO(done, rc = 0);
5012
5013                 if (lo->ll_flags & LF_INCOMPLETE)
5014                         GOTO(done, rc = 1);
5015
5016                 if (rc == -ETIMEDOUT)
5017                         continue;
5018
5019                 GOTO(done, rc = (rc < 0 ? rc : 1));
5020         }
5021
5022 done:
5023         rc = lfsck_layout_double_scan_result(env, com, rc);
5024         lfsck_layout_slave_notify_master(env, com, LE_PHASE2_DONE,
5025                         (rc > 0 && lo->ll_flags & LF_INCOMPLETE) ? 0 : rc);
5026         lfsck_layout_slave_quit(env, com);
5027         if (atomic_dec_and_test(&lfsck->li_double_scan_count))
5028                 wake_up_all(&lfsck->li_thread.t_ctl_waitq);
5029
5030         CDEBUG(D_LFSCK, "%s: layout LFSCK slave phase2 scan finished, "
5031                "status %d: rc = %d\n",
5032                lfsck_lfsck2name(lfsck), lo->ll_status, rc);
5033
5034         return rc;
5035 }
5036
5037 static void lfsck_layout_master_data_release(const struct lu_env *env,
5038                                              struct lfsck_component *com)
5039 {
5040         struct lfsck_assistant_data     *lad    = com->lc_data;
5041         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5042         struct lfsck_tgt_descs          *ltds;
5043         struct lfsck_tgt_desc           *ltd;
5044         struct lfsck_tgt_desc           *next;
5045
5046         LASSERT(lad != NULL);
5047         LASSERT(thread_is_init(&lad->lad_thread) ||
5048                 thread_is_stopped(&lad->lad_thread));
5049         LASSERT(list_empty(&lad->lad_req_list));
5050
5051         com->lc_data = NULL;
5052
5053         ltds = &lfsck->li_ost_descs;
5054         spin_lock(&ltds->ltd_lock);
5055         list_for_each_entry_safe(ltd, next, &lad->lad_ost_phase1_list,
5056                                  ltd_layout_phase_list) {
5057                 list_del_init(&ltd->ltd_layout_phase_list);
5058         }
5059         list_for_each_entry_safe(ltd, next, &lad->lad_ost_phase2_list,
5060                                  ltd_layout_phase_list) {
5061                 list_del_init(&ltd->ltd_layout_phase_list);
5062         }
5063         list_for_each_entry_safe(ltd, next, &lad->lad_ost_list,
5064                                  ltd_layout_list) {
5065                 list_del_init(&ltd->ltd_layout_list);
5066         }
5067         spin_unlock(&ltds->ltd_lock);
5068
5069         ltds = &lfsck->li_mdt_descs;
5070         spin_lock(&ltds->ltd_lock);
5071         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase1_list,
5072                                  ltd_layout_phase_list) {
5073                 list_del_init(&ltd->ltd_layout_phase_list);
5074         }
5075         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
5076                                  ltd_layout_phase_list) {
5077                 list_del_init(&ltd->ltd_layout_phase_list);
5078         }
5079         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_list,
5080                                  ltd_layout_list) {
5081                 list_del_init(&ltd->ltd_layout_list);
5082         }
5083         spin_unlock(&ltds->ltd_lock);
5084
5085         if (likely(lad->lad_bitmap != NULL))
5086                 CFS_FREE_BITMAP(lad->lad_bitmap);
5087
5088         OBD_FREE_PTR(lad);
5089 }
5090
5091 static void lfsck_layout_slave_data_release(const struct lu_env *env,
5092                                             struct lfsck_component *com)
5093 {
5094         struct lfsck_layout_slave_data *llsd = com->lc_data;
5095
5096         lfsck_layout_slave_quit(env, com);
5097         com->lc_data = NULL;
5098         OBD_FREE_PTR(llsd);
5099 }
5100
5101 static void lfsck_layout_master_quit(const struct lu_env *env,
5102                                      struct lfsck_component *com)
5103 {
5104         struct lfsck_assistant_data     *lad    = com->lc_data;
5105         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5106         struct lfsck_tgt_descs          *ltds;
5107         struct lfsck_tgt_desc           *ltd;
5108         struct lfsck_tgt_desc           *next;
5109
5110         LASSERT(lad != NULL);
5111
5112         lfsck_quit_generic(env, com);
5113
5114         LASSERT(thread_is_init(&lad->lad_thread) ||
5115                 thread_is_stopped(&lad->lad_thread));
5116         LASSERT(list_empty(&lad->lad_req_list));
5117
5118         ltds = &lfsck->li_ost_descs;
5119         spin_lock(&ltds->ltd_lock);
5120         list_for_each_entry_safe(ltd, next, &lad->lad_ost_phase1_list,
5121                                  ltd_layout_phase_list) {
5122                 list_del_init(&ltd->ltd_layout_phase_list);
5123         }
5124         list_for_each_entry_safe(ltd, next, &lad->lad_ost_phase2_list,
5125                                  ltd_layout_phase_list) {
5126                 list_del_init(&ltd->ltd_layout_phase_list);
5127         }
5128         spin_unlock(&ltds->ltd_lock);
5129
5130         ltds = &lfsck->li_mdt_descs;
5131         spin_lock(&ltds->ltd_lock);
5132         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase1_list,
5133                                  ltd_layout_phase_list) {
5134                 list_del_init(&ltd->ltd_layout_phase_list);
5135         }
5136         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
5137                                  ltd_layout_phase_list) {
5138                 list_del_init(&ltd->ltd_layout_phase_list);
5139         }
5140         spin_unlock(&ltds->ltd_lock);
5141 }
5142
5143 static void lfsck_layout_slave_quit(const struct lu_env *env,
5144                                     struct lfsck_component *com)
5145 {
5146         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
5147         struct lfsck_layout_seq          *lls;
5148         struct lfsck_layout_seq          *next;
5149         struct lfsck_layout_slave_target *llst;
5150
5151         LASSERT(llsd != NULL);
5152
5153         list_for_each_entry_safe(lls, next, &llsd->llsd_seq_list,
5154                                  lls_list) {
5155                 list_del_init(&lls->lls_list);
5156                 lfsck_object_put(env, lls->lls_lastid_obj);
5157                 OBD_FREE_PTR(lls);
5158         }
5159
5160         spin_lock(&llsd->llsd_lock);
5161         while (!list_empty(&llsd->llsd_master_list)) {
5162                 llst = list_entry(llsd->llsd_master_list.next,
5163                                   struct lfsck_layout_slave_target, llst_list);
5164                 list_del_init(&llst->llst_list);
5165                 spin_unlock(&llsd->llsd_lock);
5166                 lfsck_layout_llst_put(llst);
5167         }
5168         spin_unlock(&llsd->llsd_lock);
5169
5170         lfsck_rbtree_cleanup(env, com);
5171 }
5172
5173 static int lfsck_layout_master_in_notify(const struct lu_env *env,
5174                                          struct lfsck_component *com,
5175                                          struct lfsck_request *lr,
5176                                          struct thandle *th)
5177 {
5178         struct lfsck_instance           *lfsck = com->lc_lfsck;
5179         struct lfsck_layout             *lo    = com->lc_file_ram;
5180         struct lfsck_assistant_data     *lad   = com->lc_data;
5181         struct lfsck_tgt_descs          *ltds;
5182         struct lfsck_tgt_desc           *ltd;
5183         bool                             fail  = false;
5184         ENTRY;
5185
5186         if (lr->lr_event == LE_PAIRS_VERIFY) {
5187                 int rc;
5188
5189                 rc = lfsck_layout_master_check_pairs(env, com, &lr->lr_fid,
5190                                                      &lr->lr_fid2);
5191
5192                 RETURN(rc);
5193         }
5194
5195         CDEBUG(D_LFSCK, "%s: layout LFSCK master handles notify %u "
5196                "from %s %x, status %d, flags %x, flags2 %x\n",
5197                lfsck_lfsck2name(lfsck), lr->lr_event,
5198                (lr->lr_flags & LEF_FROM_OST) ? "OST" : "MDT",
5199                lr->lr_index, lr->lr_status, lr->lr_flags, lr->lr_flags2);
5200
5201         if (lr->lr_event != LE_PHASE1_DONE &&
5202             lr->lr_event != LE_PHASE2_DONE &&
5203             lr->lr_event != LE_PEER_EXIT)
5204                 RETURN(-EINVAL);
5205
5206         if (lr->lr_flags & LEF_FROM_OST)
5207                 ltds = &lfsck->li_ost_descs;
5208         else
5209                 ltds = &lfsck->li_mdt_descs;
5210         spin_lock(&ltds->ltd_lock);
5211         ltd = LTD_TGT(ltds, lr->lr_index);
5212         if (ltd == NULL) {
5213                 spin_unlock(&ltds->ltd_lock);
5214
5215                 RETURN(-ENXIO);
5216         }
5217
5218         list_del_init(&ltd->ltd_layout_phase_list);
5219         switch (lr->lr_event) {
5220         case LE_PHASE1_DONE:
5221                 if (lr->lr_status <= 0 || lr->lr_flags2 & LF_INCOMPLETE) {
5222                         if (lr->lr_flags2 & LF_INCOMPLETE) {
5223                                 if (lr->lr_flags & LEF_FROM_OST)
5224                                         lfsck_lad_set_bitmap(env, com,
5225                                                              ltd->ltd_index);
5226                                 else
5227                                         lo->ll_flags |= LF_INCOMPLETE;
5228                         }
5229                         ltd->ltd_layout_done = 1;
5230                         list_del_init(&ltd->ltd_layout_list);
5231                         fail = true;
5232                         break;
5233                 }
5234
5235                 if (lr->lr_flags & LEF_FROM_OST) {
5236                         if (list_empty(&ltd->ltd_layout_list))
5237                                 list_add_tail(&ltd->ltd_layout_list,
5238                                               &lad->lad_ost_list);
5239                         list_add_tail(&ltd->ltd_layout_phase_list,
5240                                       &lad->lad_ost_phase2_list);
5241                 } else {
5242                         if (list_empty(&ltd->ltd_layout_list))
5243                                 list_add_tail(&ltd->ltd_layout_list,
5244                                               &lad->lad_mdt_list);
5245                         list_add_tail(&ltd->ltd_layout_phase_list,
5246                                       &lad->lad_mdt_phase2_list);
5247                 }
5248                 break;
5249         case LE_PHASE2_DONE:
5250                 ltd->ltd_layout_done = 1;
5251                 if (!list_empty(&ltd->ltd_layout_list)) {
5252                         list_del_init(&ltd->ltd_layout_list);
5253                         if (lr->lr_flags2 & LF_INCOMPLETE) {
5254                                 lfsck_lad_set_bitmap(env, com, ltd->ltd_index);
5255                                 fail = true;
5256                         }
5257                 }
5258
5259                 break;
5260         case LE_PEER_EXIT:
5261                 fail = true;
5262                 ltd->ltd_layout_done = 1;
5263                 list_del_init(&ltd->ltd_layout_list);
5264                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT) &&
5265                     !(lr->lr_flags & LEF_FROM_OST))
5266                                 lo->ll_flags |= LF_INCOMPLETE;
5267                 break;
5268         default:
5269                 break;
5270         }
5271         spin_unlock(&ltds->ltd_lock);
5272
5273         if (fail && lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT) {
5274                 struct lfsck_stop *stop = &lfsck_env_info(env)->lti_stop;
5275
5276                 memset(stop, 0, sizeof(*stop));
5277                 stop->ls_status = lr->lr_status;
5278                 stop->ls_flags = lr->lr_param & ~LPF_BROADCAST;
5279                 lfsck_stop(env, lfsck->li_bottom, stop);
5280         } else if (lfsck_phase2_next_ready(lad)) {
5281                 wake_up_all(&lad->lad_thread.t_ctl_waitq);
5282         }
5283
5284         RETURN(0);
5285 }
5286
5287 static int lfsck_layout_slave_in_notify(const struct lu_env *env,
5288                                         struct lfsck_component *com,
5289                                         struct lfsck_request *lr,
5290                                         struct thandle *th)
5291 {
5292         struct lfsck_instance            *lfsck = com->lc_lfsck;
5293         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
5294         struct lfsck_layout_slave_target *llst;
5295         int                               rc;
5296         ENTRY;
5297
5298         switch (lr->lr_event) {
5299         case LE_FID_ACCESSED:
5300                 lfsck_rbtree_update_bitmap(env, com, &lr->lr_fid, true);
5301                 RETURN(0);
5302         case LE_CONDITIONAL_DESTROY:
5303                 rc = lfsck_layout_slave_conditional_destroy(env, com, lr);
5304                 RETURN(rc);
5305         case LE_PAIRS_VERIFY: {
5306                 lr->lr_status = LPVS_INIT;
5307                 /* Firstly, if the MDT-object which is claimed via OST-object
5308                  * local stored PFID xattr recognizes the OST-object, then it
5309                  * must be that the client given PFID is wrong. */
5310                 rc = lfsck_layout_slave_check_pairs(env, com, &lr->lr_fid,
5311                                                     &lr->lr_fid3);
5312                 if (rc <= 0)
5313                         RETURN(0);
5314
5315                 lr->lr_status = LPVS_INCONSISTENT;
5316                 /* The OST-object local stored PFID xattr is stale. We need to
5317                  * check whether the MDT-object that is claimed via the client
5318                  * given PFID information recognizes the OST-object or not. If
5319                  * matches, then need to update the OST-object's PFID xattr. */
5320                 rc = lfsck_layout_slave_check_pairs(env, com, &lr->lr_fid,
5321                                                     &lr->lr_fid2);
5322                 /* For rc < 0 case:
5323                  * We are not sure whether the client given PFID information
5324                  * is correct or not, do nothing to avoid improper fixing.
5325                  *
5326                  * For rc > 0 case:
5327                  * The client given PFID information is also invalid, we can
5328                  * NOT fix the OST-object inconsistency.
5329                  */
5330                 if (rc != 0)
5331                         RETURN(rc);
5332
5333                 lr->lr_status = LPVS_INCONSISTENT_TOFIX;
5334                 rc = lfsck_layout_slave_repair_pfid(env, com, lr);
5335
5336                 RETURN(rc);
5337         }
5338         case LE_PHASE1_DONE: {
5339                 if (lr->lr_flags2 & LF_INCOMPLETE) {
5340                         struct lfsck_layout *lo = com->lc_file_ram;
5341
5342                         lo->ll_flags |= LF_INCOMPLETE;
5343                         llst = lfsck_layout_llst_find_and_del(llsd,
5344                                                               lr->lr_index,
5345                                                               true);
5346                         if (llst != NULL) {
5347                                 lfsck_layout_llst_put(llst);
5348                                 wake_up_all(&lfsck->li_thread.t_ctl_waitq);
5349                         }
5350                 }
5351
5352                 RETURN(0);
5353         }
5354         case LE_PHASE2_DONE:
5355         case LE_PEER_EXIT:
5356                 CDEBUG(D_LFSCK, "%s: layout LFSCK slave handle notify %u "
5357                        "from MDT %x, status %d\n", lfsck_lfsck2name(lfsck),
5358                        lr->lr_event, lr->lr_index, lr->lr_status);
5359                 break;
5360         default:
5361                 RETURN(-EINVAL);
5362         }
5363
5364         llst = lfsck_layout_llst_find_and_del(llsd, lr->lr_index, true);
5365         if (llst == NULL)
5366                 RETURN(0);
5367
5368         lfsck_layout_llst_put(llst);
5369         if (list_empty(&llsd->llsd_master_list))
5370                 wake_up_all(&lfsck->li_thread.t_ctl_waitq);
5371
5372         if (lr->lr_event == LE_PEER_EXIT &&
5373             (lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT ||
5374              (list_empty(&llsd->llsd_master_list) &&
5375               (lr->lr_status == LS_STOPPED ||
5376                lr->lr_status == LS_CO_STOPPED)))) {
5377                 struct lfsck_stop *stop = &lfsck_env_info(env)->lti_stop;
5378
5379                 memset(stop, 0, sizeof(*stop));
5380                 stop->ls_status = lr->lr_status;
5381                 stop->ls_flags = lr->lr_param & ~LPF_BROADCAST;
5382                 lfsck_stop(env, lfsck->li_bottom, stop);
5383         }
5384
5385         RETURN(0);
5386 }
5387
5388 static int lfsck_layout_query(const struct lu_env *env,
5389                               struct lfsck_component *com)
5390 {
5391         struct lfsck_layout *lo = com->lc_file_ram;
5392
5393         return lo->ll_status;
5394 }
5395
5396 /* with lfsck::li_lock held */
5397 static int lfsck_layout_slave_join(const struct lu_env *env,
5398                                    struct lfsck_component *com,
5399                                    struct lfsck_start_param *lsp)
5400 {
5401         struct lfsck_instance            *lfsck = com->lc_lfsck;
5402         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
5403         struct lfsck_layout_slave_target *llst;
5404         struct lfsck_start               *start = lsp->lsp_start;
5405         int                               rc    = 0;
5406         ENTRY;
5407
5408         if (start == NULL || !(start->ls_flags & LPF_OST_ORPHAN))
5409                 RETURN(0);
5410
5411         if (!lsp->lsp_index_valid)
5412                 RETURN(-EINVAL);
5413
5414         /* If someone is running the LFSCK without orphan handling,
5415          * it will not maintain the object accessing rbtree. So we
5416          * cannot join it for orphan handling. */
5417         if (!llsd->llsd_rbtree_valid)
5418                 RETURN(-EBUSY);
5419
5420         spin_unlock(&lfsck->li_lock);
5421         rc = lfsck_layout_llst_add(llsd, lsp->lsp_index);
5422         spin_lock(&lfsck->li_lock);
5423         if (rc == 0 && !thread_is_running(&lfsck->li_thread)) {
5424                 spin_unlock(&lfsck->li_lock);
5425                 llst = lfsck_layout_llst_find_and_del(llsd, lsp->lsp_index,
5426                                                       true);
5427                 if (llst != NULL)
5428                         lfsck_layout_llst_put(llst);
5429                 spin_lock(&lfsck->li_lock);
5430                 rc = -EAGAIN;
5431         }
5432
5433         RETURN(rc);
5434 }
5435
5436 static struct lfsck_operations lfsck_layout_master_ops = {
5437         .lfsck_reset            = lfsck_layout_reset,
5438         .lfsck_fail             = lfsck_layout_fail,
5439         .lfsck_checkpoint       = lfsck_layout_master_checkpoint,
5440         .lfsck_prep             = lfsck_layout_master_prep,
5441         .lfsck_exec_oit         = lfsck_layout_master_exec_oit,
5442         .lfsck_exec_dir         = lfsck_layout_exec_dir,
5443         .lfsck_post             = lfsck_layout_master_post,
5444         .lfsck_dump             = lfsck_layout_dump,
5445         .lfsck_double_scan      = lfsck_layout_master_double_scan,
5446         .lfsck_data_release     = lfsck_layout_master_data_release,
5447         .lfsck_quit             = lfsck_layout_master_quit,
5448         .lfsck_in_notify        = lfsck_layout_master_in_notify,
5449         .lfsck_query            = lfsck_layout_query,
5450 };
5451
5452 static struct lfsck_operations lfsck_layout_slave_ops = {
5453         .lfsck_reset            = lfsck_layout_reset,
5454         .lfsck_fail             = lfsck_layout_fail,
5455         .lfsck_checkpoint       = lfsck_layout_slave_checkpoint,
5456         .lfsck_prep             = lfsck_layout_slave_prep,
5457         .lfsck_exec_oit         = lfsck_layout_slave_exec_oit,
5458         .lfsck_exec_dir         = lfsck_layout_exec_dir,
5459         .lfsck_post             = lfsck_layout_slave_post,
5460         .lfsck_dump             = lfsck_layout_dump,
5461         .lfsck_double_scan      = lfsck_layout_slave_double_scan,
5462         .lfsck_data_release     = lfsck_layout_slave_data_release,
5463         .lfsck_quit             = lfsck_layout_slave_quit,
5464         .lfsck_in_notify        = lfsck_layout_slave_in_notify,
5465         .lfsck_query            = lfsck_layout_query,
5466         .lfsck_join             = lfsck_layout_slave_join,
5467 };
5468
5469 static void lfsck_layout_assistant_fill_pos(const struct lu_env *env,
5470                                             struct lfsck_component *com,
5471                                             struct lfsck_position *pos)
5472 {
5473         struct lfsck_assistant_data     *lad = com->lc_data;
5474         struct lfsck_layout_req         *llr;
5475
5476         if (list_empty(&lad->lad_req_list))
5477                 return;
5478
5479         llr = list_entry(lad->lad_req_list.next,
5480                          struct lfsck_layout_req,
5481                          llr_lar.lar_list);
5482         pos->lp_oit_cookie = llr->llr_parent->llo_cookie - 1;
5483 }
5484
5485 struct lfsck_assistant_operations lfsck_layout_assistant_ops = {
5486         .la_handler_p1          = lfsck_layout_assistant_handler_p1,
5487         .la_handler_p2          = lfsck_layout_assistant_handler_p2,
5488         .la_fill_pos            = lfsck_layout_assistant_fill_pos,
5489         .la_double_scan_result  = lfsck_layout_double_scan_result,
5490         .la_req_fini            = lfsck_layout_assistant_req_fini,
5491         .la_sync_failures       = lfsck_layout_assistant_sync_failures,
5492 };
5493
5494 int lfsck_layout_setup(const struct lu_env *env, struct lfsck_instance *lfsck)
5495 {
5496         struct lfsck_component  *com;
5497         struct lfsck_layout     *lo;
5498         struct dt_object        *root = NULL;
5499         struct dt_object        *obj;
5500         int                      rc;
5501         ENTRY;
5502
5503         OBD_ALLOC_PTR(com);
5504         if (com == NULL)
5505                 RETURN(-ENOMEM);
5506
5507         INIT_LIST_HEAD(&com->lc_link);
5508         INIT_LIST_HEAD(&com->lc_link_dir);
5509         init_rwsem(&com->lc_sem);
5510         atomic_set(&com->lc_ref, 1);
5511         com->lc_lfsck = lfsck;
5512         com->lc_type = LFSCK_TYPE_LAYOUT;
5513         if (lfsck->li_master) {
5514                 com->lc_ops = &lfsck_layout_master_ops;
5515                 com->lc_data = lfsck_assistant_data_init(
5516                                 &lfsck_layout_assistant_ops,
5517                                 LFSCK_LAYOUT);
5518                 if (com->lc_data == NULL)
5519                         GOTO(out, rc = -ENOMEM);
5520         } else {
5521                 struct lfsck_layout_slave_data *llsd;
5522
5523                 com->lc_ops = &lfsck_layout_slave_ops;
5524                 OBD_ALLOC_PTR(llsd);
5525                 if (llsd == NULL)
5526                         GOTO(out, rc = -ENOMEM);
5527
5528                 INIT_LIST_HEAD(&llsd->llsd_seq_list);
5529                 INIT_LIST_HEAD(&llsd->llsd_master_list);
5530                 spin_lock_init(&llsd->llsd_lock);
5531                 llsd->llsd_rb_root = RB_ROOT;
5532                 rwlock_init(&llsd->llsd_rb_lock);
5533                 com->lc_data = llsd;
5534         }
5535         com->lc_file_size = sizeof(*lo);
5536         OBD_ALLOC(com->lc_file_ram, com->lc_file_size);
5537         if (com->lc_file_ram == NULL)
5538                 GOTO(out, rc = -ENOMEM);
5539
5540         OBD_ALLOC(com->lc_file_disk, com->lc_file_size);
5541         if (com->lc_file_disk == NULL)
5542                 GOTO(out, rc = -ENOMEM);
5543
5544         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
5545         if (IS_ERR(root))
5546                 GOTO(out, rc = PTR_ERR(root));
5547
5548         if (unlikely(!dt_try_as_dir(env, root)))
5549                 GOTO(out, rc = -ENOTDIR);
5550
5551         obj = local_file_find_or_create(env, lfsck->li_los, root,
5552                                         LFSCK_LAYOUT,
5553                                         S_IFREG | S_IRUGO | S_IWUSR);
5554         if (IS_ERR(obj))
5555                 GOTO(out, rc = PTR_ERR(obj));
5556
5557         com->lc_obj = obj;
5558         rc = lfsck_layout_load(env, com);
5559         if (rc > 0)
5560                 rc = lfsck_layout_reset(env, com, true);
5561         else if (rc == -ENOENT)
5562                 rc = lfsck_layout_init(env, com);
5563
5564         if (rc != 0)
5565                 GOTO(out, rc);
5566
5567         lo = com->lc_file_ram;
5568         switch (lo->ll_status) {
5569         case LS_INIT:
5570         case LS_COMPLETED:
5571         case LS_FAILED:
5572         case LS_STOPPED:
5573         case LS_PARTIAL:
5574                 spin_lock(&lfsck->li_lock);
5575                 list_add_tail(&com->lc_link, &lfsck->li_list_idle);
5576                 spin_unlock(&lfsck->li_lock);
5577                 break;
5578         default:
5579                 CERROR("%s: unknown lfsck_layout status %d\n",
5580                        lfsck_lfsck2name(lfsck), lo->ll_status);
5581                 /* fall through */
5582         case LS_SCANNING_PHASE1:
5583         case LS_SCANNING_PHASE2:
5584                 /* No need to store the status to disk right now.
5585                  * If the system crashed before the status stored,
5586                  * it will be loaded back when next time. */
5587                 lo->ll_status = LS_CRASHED;
5588                 if (!lfsck->li_master)
5589                         lo->ll_flags |= LF_INCOMPLETE;
5590                 /* fall through */
5591         case LS_PAUSED:
5592         case LS_CRASHED:
5593         case LS_CO_FAILED:
5594         case LS_CO_STOPPED:
5595         case LS_CO_PAUSED:
5596                 spin_lock(&lfsck->li_lock);
5597                 list_add_tail(&com->lc_link, &lfsck->li_list_scan);
5598                 spin_unlock(&lfsck->li_lock);
5599                 break;
5600         }
5601
5602         if (lo->ll_flags & LF_CRASHED_LASTID) {
5603                 LASSERT(lfsck->li_out_notify != NULL);
5604
5605                 lfsck->li_out_notify(env, lfsck->li_out_notify_data,
5606                                      LE_LASTID_REBUILDING);
5607         }
5608
5609         GOTO(out, rc = 0);
5610
5611 out:
5612         if (root != NULL && !IS_ERR(root))
5613                 lu_object_put(env, &root->do_lu);
5614
5615         if (rc != 0) {
5616                 lfsck_component_cleanup(env, com);
5617                 CERROR("%s: fail to init layout LFSCK component: rc = %d\n",
5618                        lfsck_lfsck2name(lfsck), rc);
5619         }
5620
5621         return rc;
5622 }
5623
5624 struct lfsck_orphan_it {
5625         struct lfsck_component           *loi_com;
5626         struct lfsck_rbtree_node         *loi_lrn;
5627         struct lfsck_layout_slave_target *loi_llst;
5628         struct lu_fid                     loi_key;
5629         struct lu_orphan_rec              loi_rec;
5630         __u64                             loi_hash;
5631         unsigned int                      loi_over:1;
5632 };
5633
5634 static int lfsck_fid_match_idx(const struct lu_env *env,
5635                                struct lfsck_instance *lfsck,
5636                                const struct lu_fid *fid, int idx)
5637 {
5638         struct seq_server_site  *ss;
5639         struct lu_server_fld    *sf;
5640         struct lu_seq_range     *range = &lfsck_env_info(env)->lti_range;
5641         int                      rc;
5642
5643         /* All abnormal cases will be returned to MDT0. */
5644         if (!fid_is_norm(fid)) {
5645                 if (idx == 0)
5646                         return 1;
5647
5648                 return 0;
5649         }
5650
5651         ss = lu_site2seq(lfsck->li_bottom->dd_lu_dev.ld_site);
5652         if (unlikely(ss == NULL))
5653                 return -ENOTCONN;
5654
5655         sf = ss->ss_server_fld;
5656         LASSERT(sf != NULL);
5657
5658         fld_range_set_any(range);
5659         rc = fld_server_lookup(env, sf, fid_seq(fid), range);
5660         if (rc != 0)
5661                 return rc;
5662
5663         if (!fld_range_is_mdt(range))
5664                 return -EINVAL;
5665
5666         if (range->lsr_index == idx)
5667                 return 1;
5668
5669         return 0;
5670 }
5671
5672 static void lfsck_layout_destroy_orphan(const struct lu_env *env,
5673                                         struct dt_device *dev,
5674                                         struct dt_object *obj)
5675 {
5676         struct thandle *handle;
5677         int             rc;
5678         ENTRY;
5679
5680         handle = dt_trans_create(env, dev);
5681         if (IS_ERR(handle))
5682                 RETURN_EXIT;
5683
5684         rc = dt_declare_ref_del(env, obj, handle);
5685         if (rc != 0)
5686                 GOTO(stop, rc);
5687
5688         rc = dt_declare_destroy(env, obj, handle);
5689         if (rc != 0)
5690                 GOTO(stop, rc);
5691
5692         rc = dt_trans_start_local(env, dev, handle);
5693         if (rc != 0)
5694                 GOTO(stop, rc);
5695
5696         dt_write_lock(env, obj, 0);
5697         rc = dt_ref_del(env, obj, handle);
5698         if (rc == 0)
5699                 rc = dt_destroy(env, obj, handle);
5700         dt_write_unlock(env, obj);
5701
5702         GOTO(stop, rc);
5703
5704 stop:
5705         dt_trans_stop(env, dev, handle);
5706
5707         CDEBUG(D_LFSCK, "destroy orphan OST-object "DFID": rc = %d\n",
5708                PFID(lfsck_dto2fid(obj)), rc);
5709
5710         RETURN_EXIT;
5711 }
5712
5713 static int lfsck_orphan_index_lookup(const struct lu_env *env,
5714                                      struct dt_object *dt,
5715                                      struct dt_rec *rec,
5716                                      const struct dt_key *key,
5717                                      struct lustre_capa *capa)
5718 {
5719         return -EOPNOTSUPP;
5720 }
5721
5722 static int lfsck_orphan_index_declare_insert(const struct lu_env *env,
5723                                              struct dt_object *dt,
5724                                              const struct dt_rec *rec,
5725                                              const struct dt_key *key,
5726                                              struct thandle *handle)
5727 {
5728         return -EOPNOTSUPP;
5729 }
5730
5731 static int lfsck_orphan_index_insert(const struct lu_env *env,
5732                                      struct dt_object *dt,
5733                                      const struct dt_rec *rec,
5734                                      const struct dt_key *key,
5735                                      struct thandle *handle,
5736                                      struct lustre_capa *capa,
5737                                      int ignore_quota)
5738 {
5739         return -EOPNOTSUPP;
5740 }
5741
5742 static int lfsck_orphan_index_declare_delete(const struct lu_env *env,
5743                                              struct dt_object *dt,
5744                                              const struct dt_key *key,
5745                                              struct thandle *handle)
5746 {
5747         return -EOPNOTSUPP;
5748 }
5749
5750 static int lfsck_orphan_index_delete(const struct lu_env *env,
5751                                      struct dt_object *dt,
5752                                      const struct dt_key *key,
5753                                      struct thandle *handle,
5754                                      struct lustre_capa *capa)
5755 {
5756         return -EOPNOTSUPP;
5757 }
5758
5759 static struct dt_it *lfsck_orphan_it_init(const struct lu_env *env,
5760                                           struct dt_object *dt,
5761                                           __u32 attr,
5762                                           struct lustre_capa *capa)
5763 {
5764         struct dt_device                *dev    = lu2dt_dev(dt->do_lu.lo_dev);
5765         struct lfsck_instance           *lfsck;
5766         struct lfsck_component          *com    = NULL;
5767         struct lfsck_layout_slave_data  *llsd;
5768         struct lfsck_orphan_it          *it     = NULL;
5769         struct lfsck_layout             *lo;
5770         int                              rc     = 0;
5771         ENTRY;
5772
5773         lfsck = lfsck_instance_find(dev, true, false);
5774         if (unlikely(lfsck == NULL))
5775                 RETURN(ERR_PTR(-ENXIO));
5776
5777         com = lfsck_component_find(lfsck, LFSCK_TYPE_LAYOUT);
5778         if (unlikely(com == NULL))
5779                 GOTO(out, rc = -ENOENT);
5780
5781         lo = com->lc_file_ram;
5782         if (lo->ll_flags & LF_INCOMPLETE)
5783                 GOTO(out, rc = -ESRCH);
5784
5785         llsd = com->lc_data;
5786         if (!llsd->llsd_rbtree_valid)
5787                 GOTO(out, rc = -ESRCH);
5788
5789         OBD_ALLOC_PTR(it);
5790         if (it == NULL)
5791                 GOTO(out, rc = -ENOMEM);
5792
5793         it->loi_llst = lfsck_layout_llst_find_and_del(llsd, attr, false);
5794         if (it->loi_llst == NULL)
5795                 GOTO(out, rc = -ENXIO);
5796
5797         if (dev->dd_record_fid_accessed) {
5798                 /* The first iteration against the rbtree, scan the whole rbtree
5799                  * to remove the nodes which do NOT need to be handled. */
5800                 write_lock(&llsd->llsd_rb_lock);
5801                 if (dev->dd_record_fid_accessed) {
5802                         struct rb_node                  *node;
5803                         struct rb_node                  *next;
5804                         struct lfsck_rbtree_node        *lrn;
5805
5806                         /* No need to record the fid accessing anymore. */
5807                         dev->dd_record_fid_accessed = 0;
5808
5809                         node = rb_first(&llsd->llsd_rb_root);
5810                         while (node != NULL) {
5811                                 next = rb_next(node);
5812                                 lrn = rb_entry(node, struct lfsck_rbtree_node,
5813                                                lrn_node);
5814                                 if (atomic_read(&lrn->lrn_known_count) <=
5815                                     atomic_read(&lrn->lrn_accessed_count)) {
5816                                         rb_erase(node, &llsd->llsd_rb_root);
5817                                         lfsck_rbtree_free(lrn);
5818                                 }
5819                                 node = next;
5820                         }
5821                 }
5822                 write_unlock(&llsd->llsd_rb_lock);
5823         }
5824
5825         /* read lock the rbtree when init, and unlock when fini */
5826         read_lock(&llsd->llsd_rb_lock);
5827         it->loi_com = com;
5828         com = NULL;
5829
5830         GOTO(out, rc = 0);
5831
5832 out:
5833         if (com != NULL)
5834                 lfsck_component_put(env, com);
5835
5836         CDEBUG(D_LFSCK, "%s: init the orphan iteration: rc = %d\n",
5837                lfsck_lfsck2name(lfsck), rc);
5838
5839         lfsck_instance_put(env, lfsck);
5840         if (rc != 0) {
5841                 if (it != NULL)
5842                         OBD_FREE_PTR(it);
5843
5844                 it = (struct lfsck_orphan_it *)ERR_PTR(rc);
5845         }
5846
5847         return (struct dt_it *)it;
5848 }
5849
5850 static void lfsck_orphan_it_fini(const struct lu_env *env,
5851                                  struct dt_it *di)
5852 {
5853         struct lfsck_orphan_it           *it    = (struct lfsck_orphan_it *)di;
5854         struct lfsck_component           *com   = it->loi_com;
5855         struct lfsck_layout_slave_data   *llsd;
5856         struct lfsck_layout_slave_target *llst;
5857
5858         if (com != NULL) {
5859                 CDEBUG(D_LFSCK, "%s: fini the orphan iteration\n",
5860                        lfsck_lfsck2name(com->lc_lfsck));
5861
5862                 llsd = com->lc_data;
5863                 read_unlock(&llsd->llsd_rb_lock);
5864                 llst = it->loi_llst;
5865                 LASSERT(llst != NULL);
5866
5867                 /* Save the key and hash for iterate next. */
5868                 llst->llst_fid = it->loi_key;
5869                 llst->llst_hash = it->loi_hash;
5870                 lfsck_layout_llst_put(llst);
5871                 lfsck_component_put(env, com);
5872         }
5873         OBD_FREE_PTR(it);
5874 }
5875
5876 /**
5877  * \retval       +1: the iteration finished
5878  * \retval        0: on success, not finished
5879  * \retval      -ve: on error
5880  */
5881 static int lfsck_orphan_it_next(const struct lu_env *env,
5882                                 struct dt_it *di)
5883 {
5884         struct lfsck_thread_info        *info   = lfsck_env_info(env);
5885         struct filter_fid_old           *pfid   = &info->lti_old_pfid;
5886         struct lu_attr                  *la     = &info->lti_la;
5887         struct lfsck_orphan_it          *it     = (struct lfsck_orphan_it *)di;
5888         struct lu_fid                   *key    = &it->loi_key;
5889         struct lu_orphan_rec            *rec    = &it->loi_rec;
5890         struct lfsck_component          *com    = it->loi_com;
5891         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5892         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
5893         struct dt_object                *obj;
5894         struct lfsck_rbtree_node        *lrn;
5895         int                              pos;
5896         int                              rc;
5897         __u32                            save;
5898         __u32                            idx    = it->loi_llst->llst_index;
5899         bool                             exact  = false;
5900         ENTRY;
5901
5902         if (it->loi_over)
5903                 RETURN(1);
5904
5905 again0:
5906         lrn = it->loi_lrn;
5907         if (lrn == NULL) {
5908                 lrn = lfsck_rbtree_search(llsd, key, &exact);
5909                 if (lrn == NULL) {
5910                         it->loi_over = 1;
5911                         RETURN(1);
5912                 }
5913
5914                 it->loi_lrn = lrn;
5915                 if (!exact) {
5916                         key->f_seq = lrn->lrn_seq;
5917                         key->f_oid = lrn->lrn_first_oid;
5918                         key->f_ver = 0;
5919                 }
5920         } else {
5921                 key->f_oid++;
5922                 if (unlikely(key->f_oid == 0)) {
5923                         key->f_seq++;
5924                         it->loi_lrn = NULL;
5925                         goto again0;
5926                 }
5927
5928                 if (key->f_oid >=
5929                     lrn->lrn_first_oid + LFSCK_RBTREE_BITMAP_WIDTH) {
5930                         it->loi_lrn = NULL;
5931                         goto again0;
5932                 }
5933         }
5934
5935         if (unlikely(atomic_read(&lrn->lrn_known_count) <=
5936                      atomic_read(&lrn->lrn_accessed_count))) {
5937                 struct rb_node *next = rb_next(&lrn->lrn_node);
5938
5939                 while (next != NULL) {
5940                         lrn = rb_entry(next, struct lfsck_rbtree_node,
5941                                        lrn_node);
5942                         if (atomic_read(&lrn->lrn_known_count) >
5943                             atomic_read(&lrn->lrn_accessed_count))
5944                                 break;
5945                         next = rb_next(next);
5946                 }
5947
5948                 if (next == NULL) {
5949                         it->loi_over = 1;
5950                         RETURN(1);
5951                 }
5952
5953                 it->loi_lrn = lrn;
5954                 key->f_seq = lrn->lrn_seq;
5955                 key->f_oid = lrn->lrn_first_oid;
5956                 key->f_ver = 0;
5957         }
5958
5959         pos = key->f_oid - lrn->lrn_first_oid;
5960
5961 again1:
5962         pos = find_next_bit(lrn->lrn_known_bitmap,
5963                             LFSCK_RBTREE_BITMAP_WIDTH, pos);
5964         if (pos >= LFSCK_RBTREE_BITMAP_WIDTH) {
5965                 key->f_oid = lrn->lrn_first_oid + pos;
5966                 if (unlikely(key->f_oid < lrn->lrn_first_oid)) {
5967                         key->f_seq++;
5968                         key->f_oid = 0;
5969                 }
5970                 it->loi_lrn = NULL;
5971                 goto again0;
5972         }
5973
5974         if (test_bit(pos, lrn->lrn_accessed_bitmap)) {
5975                 pos++;
5976                 goto again1;
5977         }
5978
5979         key->f_oid = lrn->lrn_first_oid + pos;
5980         obj = lfsck_object_find(env, lfsck, key);
5981         if (IS_ERR(obj)) {
5982                 rc = PTR_ERR(obj);
5983                 if (rc == -ENOENT) {
5984                         pos++;
5985                         goto again1;
5986                 }
5987                 RETURN(rc);
5988         }
5989
5990         dt_read_lock(env, obj, 0);
5991         if (dt_object_exists(obj) == 0 ||
5992             lfsck_is_dead_obj(obj)) {
5993                 dt_read_unlock(env, obj);
5994                 lfsck_object_put(env, obj);
5995                 pos++;
5996                 goto again1;
5997         }
5998
5999         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
6000         if (rc != 0)
6001                 GOTO(out, rc);
6002
6003         rc = dt_xattr_get(env, obj, lfsck_buf_get(env, pfid, sizeof(*pfid)),
6004                           XATTR_NAME_FID, BYPASS_CAPA);
6005         if (rc == -ENODATA) {
6006                 /* For the pre-created OST-object, update the bitmap to avoid
6007                  * others LFSCK (second phase) iteration to touch it again. */
6008                 if (la->la_ctime == 0) {
6009                         if (!test_and_set_bit(pos, lrn->lrn_accessed_bitmap))
6010                                 atomic_inc(&lrn->lrn_accessed_count);
6011
6012                         /* For the race between repairing dangling referenced
6013                          * MDT-object and unlink the file, it may left orphan
6014                          * OST-object there. Destroy it now! */
6015                         if (unlikely(!(la->la_mode & S_ISUID))) {
6016                                 dt_read_unlock(env, obj);
6017                                 lfsck_layout_destroy_orphan(env,
6018                                                             lfsck->li_bottom,
6019                                                             obj);
6020                                 lfsck_object_put(env, obj);
6021                                 pos++;
6022                                 goto again1;
6023                         }
6024                 } else if (idx == 0) {
6025                         /* If the orphan OST-object has no parent information,
6026                          * regard it as referenced by the MDT-object on MDT0. */
6027                         fid_zero(&rec->lor_fid);
6028                         rec->lor_uid = la->la_uid;
6029                         rec->lor_gid = la->la_gid;
6030                         GOTO(out, rc = 0);
6031                 }
6032
6033                 dt_read_unlock(env, obj);
6034                 lfsck_object_put(env, obj);
6035                 pos++;
6036                 goto again1;
6037         }
6038
6039         if (rc < 0)
6040                 GOTO(out, rc);
6041
6042         if (rc != sizeof(struct filter_fid) &&
6043             rc != sizeof(struct filter_fid_old))
6044                 GOTO(out, rc = -EINVAL);
6045
6046         fid_le_to_cpu(&rec->lor_fid, &pfid->ff_parent);
6047         /* Currently, the filter_fid::ff_parent::f_ver is not the real parent
6048          * MDT-object's FID::f_ver, instead it is the OST-object index in its
6049          * parent MDT-object's layout EA. */
6050         save = rec->lor_fid.f_stripe_idx;
6051         rec->lor_fid.f_ver = 0;
6052         rc = lfsck_fid_match_idx(env, lfsck, &rec->lor_fid, idx);
6053         /* If the orphan OST-object does not claim the MDT, then next.
6054          *
6055          * If we do not know whether it matches or not, then return it
6056          * to the MDT for further check. */
6057         if (rc == 0) {
6058                 dt_read_unlock(env, obj);
6059                 lfsck_object_put(env, obj);
6060                 pos++;
6061                 goto again1;
6062         }
6063
6064         rec->lor_fid.f_stripe_idx = save;
6065         rec->lor_uid = la->la_uid;
6066         rec->lor_gid = la->la_gid;
6067
6068         CDEBUG(D_LFSCK, "%s: return orphan "DFID", PFID "DFID", owner %u:%u\n",
6069                lfsck_lfsck2name(com->lc_lfsck), PFID(key), PFID(&rec->lor_fid),
6070                rec->lor_uid, rec->lor_gid);
6071
6072         GOTO(out, rc = 0);
6073
6074 out:
6075         dt_read_unlock(env, obj);
6076         lfsck_object_put(env, obj);
6077         if (rc == 0)
6078                 it->loi_hash++;
6079
6080         return rc;
6081 }
6082
6083 /**
6084  * \retval       +1: locate to the exactly position
6085  * \retval        0: cannot locate to the exactly position,
6086  *                   call next() to move to a valid position.
6087  * \retval      -ve: on error
6088  */
6089 static int lfsck_orphan_it_get(const struct lu_env *env,
6090                                struct dt_it *di,
6091                                const struct dt_key *key)
6092 {
6093         struct lfsck_orphan_it  *it   = (struct lfsck_orphan_it *)di;
6094         int                      rc;
6095
6096         it->loi_key = *(struct lu_fid *)key;
6097         rc = lfsck_orphan_it_next(env, di);
6098         if (rc == 1)
6099                 return 0;
6100
6101         if (rc == 0)
6102                 return 1;
6103
6104         return rc;
6105 }
6106
6107 static void lfsck_orphan_it_put(const struct lu_env *env,
6108                                 struct dt_it *di)
6109 {
6110 }
6111
6112 static struct dt_key *lfsck_orphan_it_key(const struct lu_env *env,
6113                                           const struct dt_it *di)
6114 {
6115         struct lfsck_orphan_it *it = (struct lfsck_orphan_it *)di;
6116
6117         return (struct dt_key *)&it->loi_key;
6118 }
6119
6120 static int lfsck_orphan_it_key_size(const struct lu_env *env,
6121                                     const struct dt_it *di)
6122 {
6123         return sizeof(struct lu_fid);
6124 }
6125
6126 static int lfsck_orphan_it_rec(const struct lu_env *env,
6127                                const struct dt_it *di,
6128                                struct dt_rec *rec,
6129                                __u32 attr)
6130 {
6131         struct lfsck_orphan_it *it = (struct lfsck_orphan_it *)di;
6132
6133         *(struct lu_orphan_rec *)rec = it->loi_rec;
6134
6135         return 0;
6136 }
6137
6138 static __u64 lfsck_orphan_it_store(const struct lu_env *env,
6139                                    const struct dt_it *di)
6140 {
6141         struct lfsck_orphan_it  *it   = (struct lfsck_orphan_it *)di;
6142
6143         return it->loi_hash;
6144 }
6145
6146 /**
6147  * \retval       +1: locate to the exactly position
6148  * \retval        0: cannot locate to the exactly position,
6149  *                   call next() to move to a valid position.
6150  * \retval      -ve: on error
6151  */
6152 static int lfsck_orphan_it_load(const struct lu_env *env,
6153                                 const struct dt_it *di,
6154                                 __u64 hash)
6155 {
6156         struct lfsck_orphan_it           *it   = (struct lfsck_orphan_it *)di;
6157         struct lfsck_layout_slave_target *llst = it->loi_llst;
6158         int                               rc;
6159
6160         LASSERT(llst != NULL);
6161
6162         if (hash != llst->llst_hash) {
6163                 CDEBUG(D_LFSCK, "%s: the given hash "LPU64" for orphan "
6164                        "iteration does not match the one when fini "
6165                        LPU64", to be reset.\n",
6166                        lfsck_lfsck2name(it->loi_com->lc_lfsck), hash,
6167                        llst->llst_hash);
6168                 fid_zero(&llst->llst_fid);
6169                 llst->llst_hash = 0;
6170         }
6171
6172         it->loi_key = llst->llst_fid;
6173         it->loi_hash = llst->llst_hash;
6174         rc = lfsck_orphan_it_next(env, (struct dt_it *)di);
6175         if (rc == 1)
6176                 return 0;
6177
6178         if (rc == 0)
6179                 return 1;
6180
6181         return rc;
6182 }
6183
6184 static int lfsck_orphan_it_key_rec(const struct lu_env *env,
6185                                    const struct dt_it *di,
6186                                    void *key_rec)
6187 {
6188         return 0;
6189 }
6190
6191 const struct dt_index_operations lfsck_orphan_index_ops = {
6192         .dio_lookup             = lfsck_orphan_index_lookup,
6193         .dio_declare_insert     = lfsck_orphan_index_declare_insert,
6194         .dio_insert             = lfsck_orphan_index_insert,
6195         .dio_declare_delete     = lfsck_orphan_index_declare_delete,
6196         .dio_delete             = lfsck_orphan_index_delete,
6197         .dio_it = {
6198                 .init           = lfsck_orphan_it_init,
6199                 .fini           = lfsck_orphan_it_fini,
6200                 .get            = lfsck_orphan_it_get,
6201                 .put            = lfsck_orphan_it_put,
6202                 .next           = lfsck_orphan_it_next,
6203                 .key            = lfsck_orphan_it_key,
6204                 .key_size       = lfsck_orphan_it_key_size,
6205                 .rec            = lfsck_orphan_it_rec,
6206                 .store          = lfsck_orphan_it_store,
6207                 .load           = lfsck_orphan_it_load,
6208                 .key_rec        = lfsck_orphan_it_key_rec,
6209         }
6210 };