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 dt_object        *llo_obj;
  93         struct lu_attr           llo_attr;
  94         atomic_t                 llo_ref;
  95         __u64                    llo_cookie;
  96         __u16                    llo_gen;
  97 };
  98
  99 struct lfsck_layout_req {
 100         struct lfsck_assistant_req       llr_lar;
 101         struct lfsck_layout_object      *llr_parent;
 102         struct dt_object                *llr_child;
 103         __u32                            llr_ost_idx;
 104         __u32                            llr_lov_idx; /* offset in LOV EA */
 105 };
 106
 107 struct lfsck_layout_slave_async_args {
 108         struct obd_export                *llsaa_exp;
 109         struct lfsck_component           *llsaa_com;
 110         struct lfsck_layout_slave_target *llsaa_llst;
 111 };
 112
 113 static struct lfsck_layout_object *
 114 lfsck_layout_object_init(const struct lu_env *env, struct dt_object *obj,
 115                          __u64 cookie, __u16 gen)
 116 {
 117         struct lfsck_layout_object *llo;
 118         int                         rc;
 119
 120         OBD_ALLOC_PTR(llo);
 121         if (llo == NULL)
 122                 return ERR_PTR(-ENOMEM);
 123
 124         rc = dt_attr_get(env, obj, &llo->llo_attr, BYPASS_CAPA);
 125         if (rc != 0) {
 126                 OBD_FREE_PTR(llo);
 127
 128                 return ERR_PTR(rc);
 129         }
 130
 131         lu_object_get(&obj->do_lu);
 132         llo->llo_obj = obj;
 133         llo->llo_cookie = cookie;
 134         /* The gen can be used to check whether some others have changed the
 135          * file layout after LFSCK pre-fetching but before real verification. */
 136         llo->llo_gen = gen;
 137         atomic_set(&llo->llo_ref, 1);
 138
 139         return llo;
 140 }
 141
 142 static inline void
 143 lfsck_layout_llst_put(struct lfsck_layout_slave_target *llst)
 144 {
 145         if (atomic_dec_and_test(&llst->llst_ref)) {
 146                 LASSERT(list_empty(&llst->llst_list));
 147
 148                 OBD_FREE_PTR(llst);
 149         }
 150 }
 151
 152 static inline int
 153 lfsck_layout_llst_add(struct lfsck_layout_slave_data *llsd, __u32 index)
 154 {
 155         struct lfsck_layout_slave_target *llst;
 156         struct lfsck_layout_slave_target *tmp;
 157         int                               rc   = 0;
 158
 159         OBD_ALLOC_PTR(llst);
 160         if (llst == NULL)
 161                 return -ENOMEM;
 162
 163         INIT_LIST_HEAD(&llst->llst_list);
 164         llst->llst_gen = 0;
 165         llst->llst_index = index;
 166         atomic_set(&llst->llst_ref, 1);
 167
 168         spin_lock(&llsd->llsd_lock);
 169         list_for_each_entry(tmp, &llsd->llsd_master_list, llst_list) {
 170                 if (tmp->llst_index == index) {
 171                         rc = -EALREADY;
 172                         break;
 173                 }
 174         }
 175         if (rc == 0)
 176                 list_add_tail(&llst->llst_list, &llsd->llsd_master_list);
 177         spin_unlock(&llsd->llsd_lock);
 178
 179         if (rc != 0)
 180                 OBD_FREE_PTR(llst);
 181
 182         return rc;
 183 }
 184
 185 static inline void
 186 lfsck_layout_llst_del(struct lfsck_layout_slave_data *llsd,
 187                       struct lfsck_layout_slave_target *llst)
 188 {
 189         bool del = false;
 190
 191         spin_lock(&llsd->llsd_lock);
 192         if (!list_empty(&llst->llst_list)) {
 193                 list_del_init(&llst->llst_list);
 194                 del = true;
 195         }
 196         spin_unlock(&llsd->llsd_lock);
 197
 198         if (del)
 199                 lfsck_layout_llst_put(llst);
 200 }
 201
 202 static inline struct lfsck_layout_slave_target *
 203 lfsck_layout_llst_find_and_del(struct lfsck_layout_slave_data *llsd,
 204                                __u32 index, bool unlink)
 205 {
 206         struct lfsck_layout_slave_target *llst;
 207
 208         spin_lock(&llsd->llsd_lock);
 209         list_for_each_entry(llst, &llsd->llsd_master_list, llst_list) {
 210                 if (llst->llst_index == index) {
 211                         if (unlink)
 212                                 list_del_init(&llst->llst_list);
 213                         else
 214                                 atomic_inc(&llst->llst_ref);
 215                         spin_unlock(&llsd->llsd_lock);
 216
 217                         return llst;
 218                 }
 219         }
 220         spin_unlock(&llsd->llsd_lock);
 221
 222         return NULL;
 223 }
 224
 225 static inline void lfsck_layout_object_put(const struct lu_env *env,
 226                                            struct lfsck_layout_object *llo)
 227 {
 228         if (atomic_dec_and_test(&llo->llo_ref)) {
 229                 lfsck_object_put(env, llo->llo_obj);
 230                 OBD_FREE_PTR(llo);
 231         }
 232 }
 233
 234 static struct lfsck_layout_req *
 235 lfsck_layout_assistant_req_init(struct lfsck_layout_object *parent,
 236                                 struct dt_object *child, __u32 ost_idx,
 237                                 __u32 lov_idx)
 238 {
 239         struct lfsck_layout_req *llr;
 240
 241         OBD_ALLOC_PTR(llr);
 242         if (llr == NULL)
 243                 return ERR_PTR(-ENOMEM);
 244
 245         INIT_LIST_HEAD(&llr->llr_lar.lar_list);
 246         atomic_inc(&parent->llo_ref);
 247         llr->llr_parent = parent;
 248         llr->llr_child = child;
 249         llr->llr_ost_idx = ost_idx;
 250         llr->llr_lov_idx = lov_idx;
 251
 252         return llr;
 253 }
 254
 255 static void lfsck_layout_assistant_req_fini(const struct lu_env *env,
 256                                             struct lfsck_assistant_req *lar)
 257 {
 258         struct lfsck_layout_req *llr =
 259                         container_of0(lar, struct lfsck_layout_req, llr_lar);
 260
 261         lu_object_put(env, &llr->llr_child->do_lu);
 262         lfsck_layout_object_put(env, llr->llr_parent);
 263         OBD_FREE_PTR(llr);
 264 }
 265
 266 static int
 267 lfsck_layout_assistant_sync_failures_interpret(const struct lu_env *env,
 268                                                struct ptlrpc_request *req,
 269                                                void *args, int rc)
 270 {
 271         struct lfsck_async_interpret_args *laia = args;
 272
 273         if (rc == 0)
 274                 atomic_dec(laia->laia_count);
 275
 276         return 0;
 277 }
 278
 279 /**
 280  * Notify remote LFSCK instances about former failures.
 281  *
 282  * The local LFSCK instance has recorded which OSTs have ever failed to respond
 283  * some LFSCK verification requests (maybe because of network issues or the OST
 284  * itself trouble). During the respond gap, the OST may missed some OST-objects
 285  * verification, then the OST cannot know whether related OST-objects have been
 286  * referenced by related MDT-objects or not, then in the second-stage scanning,
 287  * these OST-objects will be regarded as orphan, if the OST-object contains bad
 288  * parent FID for back reference, then it will misguide the LFSCK to make wrong
 289  * fixing for the fake orphan.
 290  *
 291  * To avoid above trouble, when layout LFSCK finishes the first-stage scanning,
 292  * it will scan the bitmap for the ever failed OSTs, and notify them that they
 293  * have ever missed some OST-object verification and should skip the handling
 294  * for orphan OST-objects on all MDTs that are in the layout LFSCK.
 295  *
 296  * \param[in] env       pointer to the thread context
 297  * \param[in] com       pointer to the lfsck component
 298  * \param[in] lr        pointer to the lfsck request
 299  */
 300 static void lfsck_layout_assistant_sync_failures(const struct lu_env *env,
 301                                                  struct lfsck_component *com,
 302                                                  struct lfsck_request *lr)
 303 {
 304         struct lfsck_async_interpret_args *laia  =
 305                                 &lfsck_env_info(env)->lti_laia2;
 306         struct lfsck_assistant_data       *lad   = com->lc_data;
 307         struct lfsck_layout               *lo    = com->lc_file_ram;
 308         struct lfsck_instance             *lfsck = com->lc_lfsck;
 309         struct lfsck_tgt_descs            *ltds  = &lfsck->li_ost_descs;
 310         struct lfsck_tgt_desc             *ltd;
 311         struct ptlrpc_request_set         *set;
 312         atomic_t                           count;
 313         __u32                              idx;
 314         int                                rc    = 0;
 315         ENTRY;
 316
 317         if (!lad->lad_incomplete || lo->ll_flags & LF_INCOMPLETE)
 318                 RETURN_EXIT;
 319
 320         /* If the MDT has ever failed to verfiy some OST-objects,
 321          * then sync failures with them firstly. */
 322         lr->lr_flags2 = lo->ll_flags | LF_INCOMPLETE;
 323
 324         atomic_set(&count, 0);
 325         memset(laia, 0, sizeof(*laia));
 326         laia->laia_count = &count;
 327         set = ptlrpc_prep_set();
 328         if (set == NULL)
 329                 GOTO(out, rc = -ENOMEM);
 330
 331         down_read(&ltds->ltd_rw_sem);
 332         cfs_foreach_bit(lad->lad_bitmap, idx) {
 333                 ltd = LTD_TGT(ltds, idx);
 334                 LASSERT(ltd != NULL);
 335
 336                 spin_lock(&ltds->ltd_lock);
 337                 list_del_init(&ltd->ltd_layout_phase_list);
 338                 list_del_init(&ltd->ltd_layout_list);
 339                 spin_unlock(&ltds->ltd_lock);
 340
 341                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
 342                                 lfsck_layout_assistant_sync_failures_interpret,
 343                                 laia, LFSCK_NOTIFY);
 344                 if (rc != 0) {
 345                         CDEBUG(D_LFSCK, "%s: LFSCK assistant fail to "
 346                                "notify target %x for %s phase1 done: "
 347                                "rc = %d\n", lfsck_lfsck2name(com->lc_lfsck),
 348                                ltd->ltd_index, lad->lad_name, rc);
 349
 350                         break;
 351                 }
 352
 353                 atomic_inc(&count);
 354         }
 355         up_read(&ltds->ltd_rw_sem);
 356
 357         if (rc == 0 && atomic_read(&count) > 0)
 358                 rc = ptlrpc_set_wait(set);
 359
 360         ptlrpc_set_destroy(set);
 361
 362         if (rc == 0 && atomic_read(&count) > 0)
 363                 rc = -EINVAL;
 364
 365         GOTO(out, rc);
 366
 367 out:
 368         if (rc != 0)
 369                 /* If failed to sync failures with the OSTs, then have to
 370                  * mark the whole LFSCK as LF_INCOMPLETE to skip the whole
 371                  * subsequent orphan OST-object handling. */
 372                 lo->ll_flags |= LF_INCOMPLETE;
 373
 374         lr->lr_flags2 = lo->ll_flags;
 375 }
 376
 377 static int lfsck_layout_get_lovea(const struct lu_env *env,
 378                                   struct dt_object *obj, struct lu_buf *buf)
 379 {
 380         int rc;
 381
 382 again:
 383         rc = dt_xattr_get(env, obj, buf, XATTR_NAME_LOV, BYPASS_CAPA);
 384         if (rc == -ERANGE) {
 385                 rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LOV,
 386                                   BYPASS_CAPA);
 387                 if (rc <= 0)
 388                         return rc;
 389
 390                 lu_buf_realloc(buf, rc);
 391                 if (buf->lb_buf == NULL)
 392                         return -ENOMEM;
 393
 394                 goto again;
 395         }
 396
 397         if (rc == -ENODATA)
 398                 rc = 0;
 399
 400         if (rc <= 0)
 401                 return rc;
 402
 403         if (unlikely(buf->lb_buf == NULL)) {
 404                 lu_buf_alloc(buf, rc);
 405                 if (buf->lb_buf == NULL)
 406                         return -ENOMEM;
 407
 408                 goto again;
 409         }
 410
 411         return rc;
 412 }
 413
 414 static int lfsck_layout_verify_header(struct lov_mds_md_v1 *lmm)
 415 {
 416         __u32 magic;
 417         __u32 pattern;
 418
 419         magic = le32_to_cpu(lmm->lmm_magic);
 420         /* If magic crashed, keep it there. Sometime later, during OST-object
 421          * orphan handling, if some OST-object(s) back-point to it, it can be
 422          * verified and repaired. */
 423         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3) {
 424                 struct ost_id   oi;
 425                 int             rc;
 426
 427                 lmm_oi_le_to_cpu(&oi, &lmm->lmm_oi);
 428                 if ((magic & LOV_MAGIC_MASK) == LOV_MAGIC_MAGIC)
 429                         rc = -EOPNOTSUPP;
 430                 else
 431                         rc = -EINVAL;
 432
 433                 CDEBUG(D_LFSCK, "%s LOV EA magic %u on "DOSTID"\n",
 434                        rc == -EINVAL ? "Unknown" : "Unsupported",
 435                        magic, POSTID(&oi));
 436
 437                 return rc;
 438         }
 439
 440         pattern = le32_to_cpu(lmm->lmm_pattern);
 441         /* XXX: currently, we only support LOV_PATTERN_RAID0. */
 442         if (lov_pattern(pattern) != LOV_PATTERN_RAID0) {
 443                 struct ost_id oi;
 444
 445                 lmm_oi_le_to_cpu(&oi, &lmm->lmm_oi);
 446                 CDEBUG(D_LFSCK, "Unsupported LOV EA pattern %u on "DOSTID"\n",
 447                        pattern, POSTID(&oi));
 448
 449                 return -EOPNOTSUPP;
 450         }
 451
 452         return 0;
 453 }
 454
 455 #define LFSCK_RBTREE_BITMAP_SIZE        PAGE_CACHE_SIZE
 456 #define LFSCK_RBTREE_BITMAP_WIDTH       (LFSCK_RBTREE_BITMAP_SIZE << 3)
 457 #define LFSCK_RBTREE_BITMAP_MASK        (LFSCK_RBTREE_BITMAP_WIDTH - 1)
 458
 459 struct lfsck_rbtree_node {
 460         struct rb_node   lrn_node;
 461         __u64            lrn_seq;
 462         __u32            lrn_first_oid;
 463         atomic_t         lrn_known_count;
 464         atomic_t         lrn_accessed_count;
 465         void            *lrn_known_bitmap;
 466         void            *lrn_accessed_bitmap;
 467 };
 468
 469 static inline int lfsck_rbtree_cmp(struct lfsck_rbtree_node *lrn,
 470                                    __u64 seq, __u32 oid)
 471 {
 472         if (seq < lrn->lrn_seq)
 473                 return -1;
 474
 475         if (seq > lrn->lrn_seq)
 476                 return 1;
 477
 478         if (oid < lrn->lrn_first_oid)
 479                 return -1;
 480
 481         if (oid - lrn->lrn_first_oid >= LFSCK_RBTREE_BITMAP_WIDTH)
 482                 return 1;
 483
 484         return 0;
 485 }
 486
 487 /* The caller should hold llsd->llsd_rb_lock. */
 488 static struct lfsck_rbtree_node *
 489 lfsck_rbtree_search(struct lfsck_layout_slave_data *llsd,
 490                     const struct lu_fid *fid, bool *exact)
 491 {
 492         struct rb_node           *node  = llsd->llsd_rb_root.rb_node;
 493         struct rb_node           *prev  = NULL;
 494         struct lfsck_rbtree_node *lrn   = NULL;
 495         int                       rc    = 0;
 496
 497         if (exact != NULL)
 498                 *exact = true;
 499
 500         while (node != NULL) {
 501                 prev = node;
 502                 lrn = rb_entry(node, struct lfsck_rbtree_node, lrn_node);
 503                 rc = lfsck_rbtree_cmp(lrn, fid_seq(fid), fid_oid(fid));
 504                 if (rc < 0)
 505                         node = node->rb_left;
 506                 else if (rc > 0)
 507                         node = node->rb_right;
 508                 else
 509                         return lrn;
 510         }
 511
 512         if (exact == NULL)
 513                 return NULL;
 514
 515         /* If there is no exactly matched one, then to the next valid one. */
 516         *exact = false;
 517
 518         /* The rbtree is empty. */
 519         if (rc == 0)
 520                 return NULL;
 521
 522         if (rc < 0)
 523                 return lrn;
 524
 525         node = rb_next(prev);
 526
 527         /* The end of the rbtree. */
 528         if (node == NULL)
 529                 return NULL;
 530
 531         lrn = rb_entry(node, struct lfsck_rbtree_node, lrn_node);
 532
 533         return lrn;
 534 }
 535
 536 static struct lfsck_rbtree_node *lfsck_rbtree_new(const struct lu_env *env,
 537                                                   const struct lu_fid *fid)
 538 {
 539         struct lfsck_rbtree_node *lrn;
 540
 541         OBD_ALLOC_PTR(lrn);
 542         if (lrn == NULL)
 543                 return ERR_PTR(-ENOMEM);
 544
 545         OBD_ALLOC(lrn->lrn_known_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 546         if (lrn->lrn_known_bitmap == NULL) {
 547                 OBD_FREE_PTR(lrn);
 548
 549                 return ERR_PTR(-ENOMEM);
 550         }
 551
 552         OBD_ALLOC(lrn->lrn_accessed_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 553         if (lrn->lrn_accessed_bitmap == NULL) {
 554                 OBD_FREE(lrn->lrn_known_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 555                 OBD_FREE_PTR(lrn);
 556
 557                 return ERR_PTR(-ENOMEM);
 558         }
 559
 560         RB_CLEAR_NODE(&lrn->lrn_node);
 561         lrn->lrn_seq = fid_seq(fid);
 562         lrn->lrn_first_oid = fid_oid(fid) & ~LFSCK_RBTREE_BITMAP_MASK;
 563         atomic_set(&lrn->lrn_known_count, 0);
 564         atomic_set(&lrn->lrn_accessed_count, 0);
 565
 566         return lrn;
 567 }
 568
 569 static void lfsck_rbtree_free(struct lfsck_rbtree_node *lrn)
 570 {
 571         OBD_FREE(lrn->lrn_accessed_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 572         OBD_FREE(lrn->lrn_known_bitmap, LFSCK_RBTREE_BITMAP_SIZE);
 573         OBD_FREE_PTR(lrn);
 574 }
 575
 576 /* The caller should hold lock. */
 577 static struct lfsck_rbtree_node *
 578 lfsck_rbtree_insert(struct lfsck_layout_slave_data *llsd,
 579                     struct lfsck_rbtree_node *lrn)
 580 {
 581         struct rb_node           **pos    = &llsd->llsd_rb_root.rb_node;
 582         struct rb_node            *parent = NULL;
 583         struct lfsck_rbtree_node  *tmp;
 584         int                        rc;
 585
 586         while (*pos != NULL) {
 587                 parent = *pos;
 588                 tmp = rb_entry(parent, struct lfsck_rbtree_node, lrn_node);
 589                 rc = lfsck_rbtree_cmp(tmp, lrn->lrn_seq, lrn->lrn_first_oid);
 590                 if (rc < 0)
 591                         pos = &(*pos)->rb_left;
 592                 else if (rc > 0)
 593                         pos = &(*pos)->rb_right;
 594                 else
 595                         return tmp;
 596         }
 597
 598         rb_link_node(&lrn->lrn_node, parent, pos);
 599         rb_insert_color(&lrn->lrn_node, &llsd->llsd_rb_root);
 600
 601         return lrn;
 602 }
 603
 604 extern const struct dt_index_operations lfsck_orphan_index_ops;
 605
 606 static int lfsck_rbtree_setup(const struct lu_env *env,
 607                               struct lfsck_component *com)
 608 {
 609         struct lu_fid                   *fid    = &lfsck_env_info(env)->lti_fid;
 610         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 611         struct dt_device                *dev    = lfsck->li_bottom;
 612         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
 613         struct dt_object                *obj;
 614
 615         fid->f_seq = FID_SEQ_LAYOUT_RBTREE;
 616         fid->f_oid = lfsck_dev_idx(dev);
 617         fid->f_ver = 0;
 618         obj = dt_locate(env, dev, fid);
 619         if (IS_ERR(obj))
 620                 RETURN(PTR_ERR(obj));
 621
 622         /* Generate an in-RAM object to stand for the layout rbtree.
 623          * Scanning the layout rbtree will be via the iteration over
 624          * the object. In the future, the rbtree may be written onto
 625          * disk with the object.
 626          *
 627          * Mark the object to be as exist. */
 628         obj->do_lu.lo_header->loh_attr |= LOHA_EXISTS;
 629         obj->do_index_ops = &lfsck_orphan_index_ops;
 630         llsd->llsd_rb_obj = obj;
 631         llsd->llsd_rbtree_valid = 1;
 632         dev->dd_record_fid_accessed = 1;
 633
 634         CDEBUG(D_LFSCK, "%s: layout LFSCK init OST-objects accessing bitmap\n",
 635                lfsck_lfsck2name(lfsck));
 636
 637         return 0;
 638 }
 639
 640 static void lfsck_rbtree_cleanup(const struct lu_env *env,
 641                                  struct lfsck_component *com)
 642 {
 643         struct lfsck_instance           *lfsck = com->lc_lfsck;
 644         struct lfsck_layout_slave_data  *llsd  = com->lc_data;
 645         struct rb_node                  *node  = rb_first(&llsd->llsd_rb_root);
 646         struct rb_node                  *next;
 647         struct lfsck_rbtree_node        *lrn;
 648
 649         lfsck->li_bottom->dd_record_fid_accessed = 0;
 650         /* Invalid the rbtree, then no others will use it. */
 651         write_lock(&llsd->llsd_rb_lock);
 652         llsd->llsd_rbtree_valid = 0;
 653         write_unlock(&llsd->llsd_rb_lock);
 654
 655         while (node != NULL) {
 656                 next = rb_next(node);
 657                 lrn = rb_entry(node, struct lfsck_rbtree_node, lrn_node);
 658                 rb_erase(node, &llsd->llsd_rb_root);
 659                 lfsck_rbtree_free(lrn);
 660                 node = next;
 661         }
 662
 663         if (llsd->llsd_rb_obj != NULL) {
 664                 lu_object_put(env, &llsd->llsd_rb_obj->do_lu);
 665                 llsd->llsd_rb_obj = NULL;
 666         }
 667
 668         CDEBUG(D_LFSCK, "%s: layout LFSCK fini OST-objects accessing bitmap\n",
 669                lfsck_lfsck2name(lfsck));
 670 }
 671
 672 static void lfsck_rbtree_update_bitmap(const struct lu_env *env,
 673                                        struct lfsck_component *com,
 674                                        const struct lu_fid *fid,
 675                                        bool accessed)
 676 {
 677         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
 678         struct lfsck_rbtree_node        *lrn;
 679         bool                             insert = false;
 680         int                              idx;
 681         int                              rc     = 0;
 682         ENTRY;
 683
 684         if (unlikely(!fid_is_sane(fid) || fid_is_last_id(fid)))
 685                 RETURN_EXIT;
 686
 687         if (!fid_is_idif(fid) && !fid_is_norm(fid))
 688                 RETURN_EXIT;
 689
 690         read_lock(&llsd->llsd_rb_lock);
 691         if (!llsd->llsd_rbtree_valid)
 692                 GOTO(unlock, rc = 0);
 693
 694         lrn = lfsck_rbtree_search(llsd, fid, NULL);
 695         if (lrn == NULL) {
 696                 struct lfsck_rbtree_node *tmp;
 697
 698                 LASSERT(!insert);
 699
 700                 read_unlock(&llsd->llsd_rb_lock);
 701                 tmp = lfsck_rbtree_new(env, fid);
 702                 if (IS_ERR(tmp))
 703                         GOTO(out, rc = PTR_ERR(tmp));
 704
 705                 insert = true;
 706                 write_lock(&llsd->llsd_rb_lock);
 707                 if (!llsd->llsd_rbtree_valid) {
 708                         lfsck_rbtree_free(tmp);
 709                         GOTO(unlock, rc = 0);
 710                 }
 711
 712                 lrn = lfsck_rbtree_insert(llsd, tmp);
 713                 if (lrn != tmp)
 714                         lfsck_rbtree_free(tmp);
 715         }
 716
 717         idx = fid_oid(fid) & LFSCK_RBTREE_BITMAP_MASK;
 718         /* Any accessed object must be a known object. */
 719         if (!test_and_set_bit(idx, lrn->lrn_known_bitmap))
 720                 atomic_inc(&lrn->lrn_known_count);
 721         if (accessed && !test_and_set_bit(idx, lrn->lrn_accessed_bitmap))
 722                 atomic_inc(&lrn->lrn_accessed_count);
 723
 724         GOTO(unlock, rc = 0);
 725
 726 unlock:
 727         if (insert)
 728                 write_unlock(&llsd->llsd_rb_lock);
 729         else
 730                 read_unlock(&llsd->llsd_rb_lock);
 731 out:
 732         if (rc != 0 && accessed) {
 733                 struct lfsck_layout *lo = com->lc_file_ram;
 734
 735                 CDEBUG(D_LFSCK, "%s: fail to update OST-objects accessing "
 736                        "bitmap, and will cause incorrect LFSCK OST-object "
 737                        "handling, so disable it to cancel orphan handling "
 738                        "for related device. rc = %d\n",
 739                        lfsck_lfsck2name(com->lc_lfsck), rc);
 740
 741                 lo->ll_flags |= LF_INCOMPLETE;
 742                 lfsck_rbtree_cleanup(env, com);
 743         }
 744 }
 745
 746 static void lfsck_layout_le_to_cpu(struct lfsck_layout *des,
 747                                    const struct lfsck_layout *src)
 748 {
 749         int i;
 750
 751         des->ll_magic = le32_to_cpu(src->ll_magic);
 752         des->ll_status = le32_to_cpu(src->ll_status);
 753         des->ll_flags = le32_to_cpu(src->ll_flags);
 754         des->ll_success_count = le32_to_cpu(src->ll_success_count);
 755         des->ll_run_time_phase1 = le32_to_cpu(src->ll_run_time_phase1);
 756         des->ll_run_time_phase2 = le32_to_cpu(src->ll_run_time_phase2);
 757         des->ll_time_last_complete = le64_to_cpu(src->ll_time_last_complete);
 758         des->ll_time_latest_start = le64_to_cpu(src->ll_time_latest_start);
 759         des->ll_time_last_checkpoint =
 760                                 le64_to_cpu(src->ll_time_last_checkpoint);
 761         des->ll_pos_latest_start = le64_to_cpu(src->ll_pos_latest_start);
 762         des->ll_pos_last_checkpoint = le64_to_cpu(src->ll_pos_last_checkpoint);
 763         des->ll_pos_first_inconsistent =
 764                         le64_to_cpu(src->ll_pos_first_inconsistent);
 765         des->ll_objs_checked_phase1 = le64_to_cpu(src->ll_objs_checked_phase1);
 766         des->ll_objs_failed_phase1 = le64_to_cpu(src->ll_objs_failed_phase1);
 767         des->ll_objs_checked_phase2 = le64_to_cpu(src->ll_objs_checked_phase2);
 768         des->ll_objs_failed_phase2 = le64_to_cpu(src->ll_objs_failed_phase2);
 769         for (i = 0; i < LLIT_MAX; i++)
 770                 des->ll_objs_repaired[i] =
 771                                 le64_to_cpu(src->ll_objs_repaired[i]);
 772         des->ll_objs_skipped = le64_to_cpu(src->ll_objs_skipped);
 773         des->ll_bitmap_size = le32_to_cpu(src->ll_bitmap_size);
 774 }
 775
 776 static void lfsck_layout_cpu_to_le(struct lfsck_layout *des,
 777                                    const struct lfsck_layout *src)
 778 {
 779         int i;
 780
 781         des->ll_magic = cpu_to_le32(src->ll_magic);
 782         des->ll_status = cpu_to_le32(src->ll_status);
 783         des->ll_flags = cpu_to_le32(src->ll_flags);
 784         des->ll_success_count = cpu_to_le32(src->ll_success_count);
 785         des->ll_run_time_phase1 = cpu_to_le32(src->ll_run_time_phase1);
 786         des->ll_run_time_phase2 = cpu_to_le32(src->ll_run_time_phase2);
 787         des->ll_time_last_complete = cpu_to_le64(src->ll_time_last_complete);
 788         des->ll_time_latest_start = cpu_to_le64(src->ll_time_latest_start);
 789         des->ll_time_last_checkpoint =
 790                                 cpu_to_le64(src->ll_time_last_checkpoint);
 791         des->ll_pos_latest_start = cpu_to_le64(src->ll_pos_latest_start);
 792         des->ll_pos_last_checkpoint = cpu_to_le64(src->ll_pos_last_checkpoint);
 793         des->ll_pos_first_inconsistent =
 794                         cpu_to_le64(src->ll_pos_first_inconsistent);
 795         des->ll_objs_checked_phase1 = cpu_to_le64(src->ll_objs_checked_phase1);
 796         des->ll_objs_failed_phase1 = cpu_to_le64(src->ll_objs_failed_phase1);
 797         des->ll_objs_checked_phase2 = cpu_to_le64(src->ll_objs_checked_phase2);
 798         des->ll_objs_failed_phase2 = cpu_to_le64(src->ll_objs_failed_phase2);
 799         for (i = 0; i < LLIT_MAX; i++)
 800                 des->ll_objs_repaired[i] =
 801                                 cpu_to_le64(src->ll_objs_repaired[i]);
 802         des->ll_objs_skipped = cpu_to_le64(src->ll_objs_skipped);
 803         des->ll_bitmap_size = cpu_to_le32(src->ll_bitmap_size);
 804 }
 805
 806 /**
 807  * Load the OST bitmap from the lfsck_layout trace file.
 808  *
 809  * \param[in] env       pointer to the thread context
 810  * \param[in] com       pointer to the lfsck component
 811  *
 812  * \retval              0 for success
 813  * \retval              negative error number on failure or data corruption
 814  */
 815 static int lfsck_layout_load_bitmap(const struct lu_env *env,
 816                                     struct lfsck_component *com)
 817 {
 818         struct dt_object                *obj    = com->lc_obj;
 819         struct lfsck_assistant_data     *lad    = com->lc_data;
 820         struct lfsck_layout             *lo     = com->lc_file_ram;
 821         cfs_bitmap_t                    *bitmap = lad->lad_bitmap;
 822         loff_t                           pos    = com->lc_file_size;
 823         ssize_t                          size;
 824         __u32                            nbits;
 825         int                              rc;
 826         ENTRY;
 827
 828         if (com->lc_lfsck->li_ost_descs.ltd_tgts_bitmap->size >
 829             lo->ll_bitmap_size)
 830                 nbits = com->lc_lfsck->li_ost_descs.ltd_tgts_bitmap->size;
 831         else
 832                 nbits = lo->ll_bitmap_size;
 833
 834         if (unlikely(nbits < BITS_PER_LONG))
 835                 nbits = BITS_PER_LONG;
 836
 837         if (nbits > bitmap->size) {
 838                 __u32 new_bits = bitmap->size;
 839                 cfs_bitmap_t *new_bitmap;
 840
 841                 while (new_bits < nbits)
 842                         new_bits <<= 1;
 843
 844                 new_bitmap = CFS_ALLOCATE_BITMAP(new_bits);
 845                 if (new_bitmap == NULL)
 846                         RETURN(-ENOMEM);
 847
 848                 lad->lad_bitmap = new_bitmap;
 849                 CFS_FREE_BITMAP(bitmap);
 850                 bitmap = new_bitmap;
 851         }
 852
 853         if (lo->ll_bitmap_size == 0) {
 854                 lad->lad_incomplete = 0;
 855                 CFS_RESET_BITMAP(bitmap);
 856
 857                 RETURN(0);
 858         }
 859
 860         size = (lo->ll_bitmap_size + 7) >> 3;
 861         rc = dt_read(env, obj, lfsck_buf_get(env, bitmap->data, size), &pos);
 862         if (rc != size)
 863                 RETURN(rc >= 0 ? -EINVAL : rc);
 864
 865         if (cfs_bitmap_check_empty(bitmap))
 866                 lad->lad_incomplete = 0;
 867         else
 868                 lad->lad_incomplete = 1;
 869
 870         RETURN(0);
 871 }
 872
 873 /**
 874  * Load the layout LFSCK trace file from disk.
 875  *
 876  * The layout LFSCK trace file records the layout LFSCK status information
 877  * and other statistics, such as how many objects have been scanned, and how
 878  * many objects have been repaired, and etc. It also contains the bitmap for
 879  * failed OSTs during the layout LFSCK. All these information will be loaded
 880  * from disk to RAM when the layout LFSCK component setup.
 881  *
 882  * \param[in] env       pointer to the thread context
 883  * \param[in] com       pointer to the lfsck component
 884  *
 885  * \retval              positive number for file data corruption, the caller
 886  *                      should reset the layout LFSCK trace file
 887  * \retval              0 for success
 888  * \retval              negative error number on failure
 889  */
 890 static int lfsck_layout_load(const struct lu_env *env,
 891                              struct lfsck_component *com)
 892 {
 893         struct lfsck_layout             *lo     = com->lc_file_ram;
 894         ssize_t                          size   = com->lc_file_size;
 895         loff_t                           pos    = 0;
 896         int                              rc;
 897
 898         rc = dt_read(env, com->lc_obj,
 899                      lfsck_buf_get(env, com->lc_file_disk, size), &pos);
 900         if (rc == 0) {
 901                 return -ENOENT;
 902         } else if (rc < 0) {
 903                 CDEBUG(D_LFSCK, "%s: failed to load lfsck_layout: rc = %d\n",
 904                        lfsck_lfsck2name(com->lc_lfsck), rc);
 905                 return rc;
 906         } else if (rc != size) {
 907                 CDEBUG(D_LFSCK, "%s: lfsck_layout size %u != %u; reset it\n",
 908                        lfsck_lfsck2name(com->lc_lfsck), rc, (unsigned int)size);
 909                 return 1;
 910         }
 911
 912         lfsck_layout_le_to_cpu(lo, com->lc_file_disk);
 913         if (lo->ll_magic != LFSCK_LAYOUT_MAGIC) {
 914                 CDEBUG(D_LFSCK, "%s: invalid lfsck_layout magic %#x != %#x, "
 915                        "to be reset\n", lfsck_lfsck2name(com->lc_lfsck),
 916                        lo->ll_magic, LFSCK_LAYOUT_MAGIC);
 917                 return 1;
 918         }
 919
 920         return 0;
 921 }
 922
 923 /**
 924  * Store the layout LFSCK trace file on disk.
 925  *
 926  * The layout LFSCK trace file records the layout LFSCK status information
 927  * and other statistics, such as how many objects have been scanned, and how
 928  * many objects have been repaired, and etc. It also contains the bitmap for
 929  * failed OSTs during the layout LFSCK. All these information will be synced
 930  * from RAM to disk periodically.
 931  *
 932  * \param[in] env       pointer to the thread context
 933  * \param[in] com       pointer to the lfsck component
 934  *
 935  * \retval              0 for success
 936  * \retval              negative error number on failure
 937  */
 938 static int lfsck_layout_store(const struct lu_env *env,
 939                               struct lfsck_component *com)
 940 {
 941         struct dt_object        *obj    = com->lc_obj;
 942         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 943         struct lfsck_layout     *lo_ram = com->lc_file_ram;
 944         struct lfsck_layout     *lo     = com->lc_file_disk;
 945         struct thandle          *th;
 946         struct dt_device        *dev    = lfsck->li_bottom;
 947         cfs_bitmap_t            *bitmap = NULL;
 948         loff_t                   pos;
 949         ssize_t                  size   = com->lc_file_size;
 950         __u32                    nbits  = 0;
 951         int                      rc;
 952         ENTRY;
 953
 954         if (lfsck->li_master) {
 955                 struct lfsck_assistant_data *lad = com->lc_data;
 956
 957                 bitmap = lad->lad_bitmap;
 958                 nbits = bitmap->size;
 959
 960                 LASSERT(nbits > 0);
 961                 LASSERTF((nbits & 7) == 0, "Invalid nbits %u\n", nbits);
 962         }
 963
 964         lo_ram->ll_bitmap_size = nbits;
 965         lfsck_layout_cpu_to_le(lo, lo_ram);
 966         th = dt_trans_create(env, dev);
 967         if (IS_ERR(th))
 968                 GOTO(log, rc = PTR_ERR(th));
 969
 970         rc = dt_declare_record_write(env, obj, lfsck_buf_get(env, lo, size),
 971                                      (loff_t)0, th);
 972         if (rc != 0)
 973                 GOTO(out, rc);
 974
 975         if (bitmap != NULL) {
 976                 rc = dt_declare_record_write(env, obj,
 977                                 lfsck_buf_get(env, bitmap->data, nbits >> 3),
 978                                 (loff_t)size, th);
 979                 if (rc != 0)
 980                         GOTO(out, rc);
 981         }
 982
 983         rc = dt_trans_start_local(env, dev, th);
 984         if (rc != 0)
 985                 GOTO(out, rc);
 986
 987         pos = 0;
 988         rc = dt_record_write(env, obj, lfsck_buf_get(env, lo, size), &pos, th);
 989         if (rc != 0)
 990                 GOTO(out, rc);
 991
 992         if (bitmap != NULL) {
 993                 pos = size;
 994                 rc = dt_record_write(env, obj,
 995                                 lfsck_buf_get(env, bitmap->data, nbits >> 3),
 996                                 &pos, th);
 997         }
 998
 999         GOTO(out, rc);
1000
1001 out:
1002         dt_trans_stop(env, dev, th);
1003
1004 log:
1005         if (rc != 0)
1006                 CDEBUG(D_LFSCK, "%s: fail to store lfsck_layout: rc = %d\n",
1007                        lfsck_lfsck2name(lfsck), rc);
1008
1009         return rc;
1010 }
1011
1012 static int lfsck_layout_init(const struct lu_env *env,
1013                              struct lfsck_component *com)
1014 {
1015         struct lfsck_layout *lo = com->lc_file_ram;
1016         int rc;
1017
1018         memset(lo, 0, com->lc_file_size);
1019         lo->ll_magic = LFSCK_LAYOUT_MAGIC;
1020         lo->ll_status = LS_INIT;
1021         down_write(&com->lc_sem);
1022         rc = lfsck_layout_store(env, com);
1023         up_write(&com->lc_sem);
1024
1025         return rc;
1026 }
1027
1028 static int fid_is_for_ostobj(const struct lu_env *env, struct dt_device *dt,
1029                              struct dt_object *obj, const struct lu_fid *fid)
1030 {
1031         struct seq_server_site  *ss     = lu_site2seq(dt->dd_lu_dev.ld_site);
1032         struct lu_seq_range     *range  = &lfsck_env_info(env)->lti_range;
1033         struct lustre_mdt_attrs *lma;
1034         int                      rc;
1035
1036         fld_range_set_any(range);
1037         rc = fld_server_lookup(env, ss->ss_server_fld, fid_seq(fid), range);
1038         if (rc == 0) {
1039                 if (fld_range_is_ost(range))
1040                         return 1;
1041
1042                 return 0;
1043         }
1044
1045         lma = &lfsck_env_info(env)->lti_lma;
1046         rc = dt_xattr_get(env, obj, lfsck_buf_get(env, lma, sizeof(*lma)),
1047                           XATTR_NAME_LMA, BYPASS_CAPA);
1048         if (rc == sizeof(*lma)) {
1049                 lustre_lma_swab(lma);
1050
1051                 return lma->lma_compat & LMAC_FID_ON_OST ? 1 : 0;
1052         }
1053
1054         rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_FID, BYPASS_CAPA);
1055
1056         return rc > 0;
1057 }
1058
1059 static struct lfsck_layout_seq *
1060 lfsck_layout_seq_lookup(struct lfsck_layout_slave_data *llsd, __u64 seq)
1061 {
1062         struct lfsck_layout_seq *lls;
1063
1064         list_for_each_entry(lls, &llsd->llsd_seq_list, lls_list) {
1065                 if (lls->lls_seq == seq)
1066                         return lls;
1067
1068                 if (lls->lls_seq > seq)
1069                         return NULL;
1070         }
1071
1072         return NULL;
1073 }
1074
1075 static void
1076 lfsck_layout_seq_insert(struct lfsck_layout_slave_data *llsd,
1077                         struct lfsck_layout_seq *lls)
1078 {
1079         struct lfsck_layout_seq *tmp;
1080         struct list_head        *pos = &llsd->llsd_seq_list;
1081
1082         list_for_each_entry(tmp, &llsd->llsd_seq_list, lls_list) {
1083                 if (lls->lls_seq < tmp->lls_seq) {
1084                         pos = &tmp->lls_list;
1085                         break;
1086                 }
1087         }
1088         list_add_tail(&lls->lls_list, pos);
1089 }
1090
1091 static int
1092 lfsck_layout_lastid_create(const struct lu_env *env,
1093                            struct lfsck_instance *lfsck,
1094                            struct dt_object *obj)
1095 {
1096         struct lfsck_thread_info *info   = lfsck_env_info(env);
1097         struct lu_attr           *la     = &info->lti_la;
1098         struct dt_object_format  *dof    = &info->lti_dof;
1099         struct lfsck_bookmark    *bk     = &lfsck->li_bookmark_ram;
1100         struct dt_device         *dt     = lfsck->li_bottom;
1101         struct thandle           *th;
1102         __u64                     lastid = 0;
1103         loff_t                    pos    = 0;
1104         int                       rc;
1105         ENTRY;
1106
1107         if (bk->lb_param & LPF_DRYRUN)
1108                 return 0;
1109
1110         memset(la, 0, sizeof(*la));
1111         la->la_mode = S_IFREG |  S_IRUGO | S_IWUSR;
1112         la->la_valid = LA_MODE | LA_UID | LA_GID;
1113         dof->dof_type = dt_mode_to_dft(S_IFREG);
1114
1115         th = dt_trans_create(env, dt);
1116         if (IS_ERR(th))
1117                 GOTO(log, rc = PTR_ERR(th));
1118
1119         rc = dt_declare_create(env, obj, la, NULL, dof, th);
1120         if (rc != 0)
1121                 GOTO(stop, rc);
1122
1123         rc = dt_declare_record_write(env, obj,
1124                                      lfsck_buf_get(env, &lastid,
1125                                                    sizeof(lastid)),
1126                                      pos, th);
1127         if (rc != 0)
1128                 GOTO(stop, rc);
1129
1130         rc = dt_trans_start_local(env, dt, th);
1131         if (rc != 0)
1132                 GOTO(stop, rc);
1133
1134         dt_write_lock(env, obj, 0);
1135         if (likely(dt_object_exists(obj) == 0)) {
1136                 rc = dt_create(env, obj, la, NULL, dof, th);
1137                 if (rc == 0)
1138                         rc = dt_record_write(env, obj,
1139                                 lfsck_buf_get(env, &lastid, sizeof(lastid)),
1140                                 &pos, th);
1141         }
1142         dt_write_unlock(env, obj);
1143
1144         GOTO(stop, rc);
1145
1146 stop:
1147         dt_trans_stop(env, dt, th);
1148
1149 log:
1150         CDEBUG(D_LFSCK, "%s: layout LFSCK will create LAST_ID for <seq> "
1151                LPX64": rc = %d\n",
1152                lfsck_lfsck2name(lfsck), fid_seq(lfsck_dto2fid(obj)), rc);
1153
1154         return rc;
1155 }
1156
1157 static int
1158 lfsck_layout_lastid_reload(const struct lu_env *env,
1159                            struct lfsck_component *com,
1160                            struct lfsck_layout_seq *lls)
1161 {
1162         __u64   lastid;
1163         loff_t  pos     = 0;
1164         int     rc;
1165
1166         dt_read_lock(env, lls->lls_lastid_obj, 0);
1167         rc = dt_record_read(env, lls->lls_lastid_obj,
1168                             lfsck_buf_get(env, &lastid, sizeof(lastid)), &pos);
1169         dt_read_unlock(env, lls->lls_lastid_obj);
1170         if (unlikely(rc != 0))
1171                 return rc;
1172
1173         lastid = le64_to_cpu(lastid);
1174         if (lastid < lls->lls_lastid_known) {
1175                 struct lfsck_instance   *lfsck  = com->lc_lfsck;
1176                 struct lfsck_layout     *lo     = com->lc_file_ram;
1177
1178                 lls->lls_lastid = lls->lls_lastid_known;
1179                 lls->lls_dirty = 1;
1180                 if (!(lo->ll_flags & LF_CRASHED_LASTID)) {
1181                         LASSERT(lfsck->li_out_notify != NULL);
1182
1183                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
1184                                              LE_LASTID_REBUILDING);
1185                         lo->ll_flags |= LF_CRASHED_LASTID;
1186
1187                         CDEBUG(D_LFSCK, "%s: layout LFSCK finds crashed "
1188                                "LAST_ID file (1) for the sequence "LPX64
1189                                ", old value "LPU64", known value "LPU64"\n",
1190                                lfsck_lfsck2name(lfsck), lls->lls_seq,
1191                                lastid, lls->lls_lastid);
1192                 }
1193         } else if (lastid >= lls->lls_lastid) {
1194                 lls->lls_lastid = lastid;
1195                 lls->lls_dirty = 0;
1196         }
1197
1198         return 0;
1199 }
1200
1201 static int
1202 lfsck_layout_lastid_store(const struct lu_env *env,
1203                           struct lfsck_component *com)
1204 {
1205         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1206         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
1207         struct dt_device                *dt     = lfsck->li_bottom;
1208         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
1209         struct lfsck_layout_seq         *lls;
1210         struct thandle                  *th;
1211         __u64                            lastid;
1212         int                              rc     = 0;
1213         int                              rc1    = 0;
1214
1215         list_for_each_entry(lls, &llsd->llsd_seq_list, lls_list) {
1216                 loff_t pos = 0;
1217
1218                 if (!lls->lls_dirty)
1219                         continue;
1220
1221                 CDEBUG(D_LFSCK, "%s: layout LFSCK will sync the LAST_ID for "
1222                        "<seq> "LPX64" as <oid> "LPU64"\n",
1223                        lfsck_lfsck2name(lfsck), lls->lls_seq, lls->lls_lastid);
1224
1225                 if (bk->lb_param & LPF_DRYRUN) {
1226                         lls->lls_dirty = 0;
1227                         continue;
1228                 }
1229
1230                 th = dt_trans_create(env, dt);
1231                 if (IS_ERR(th)) {
1232                         rc1 = PTR_ERR(th);
1233                         CDEBUG(D_LFSCK, "%s: layout LFSCK failed to store "
1234                                "the LAST_ID for <seq> "LPX64"(1): rc = %d\n",
1235                                lfsck_lfsck2name(com->lc_lfsck),
1236                                lls->lls_seq, rc1);
1237                         continue;
1238                 }
1239
1240                 lastid = cpu_to_le64(lls->lls_lastid);
1241                 rc = dt_declare_record_write(env, lls->lls_lastid_obj,
1242                                              lfsck_buf_get(env, &lastid,
1243                                                            sizeof(lastid)),
1244                                              pos, th);
1245                 if (rc != 0)
1246                         goto stop;
1247
1248                 rc = dt_trans_start_local(env, dt, th);
1249                 if (rc != 0)
1250                         goto stop;
1251
1252                 dt_write_lock(env, lls->lls_lastid_obj, 0);
1253                 rc = dt_record_write(env, lls->lls_lastid_obj,
1254                                      lfsck_buf_get(env, &lastid,
1255                                      sizeof(lastid)), &pos, th);
1256                 dt_write_unlock(env, lls->lls_lastid_obj);
1257                 if (rc == 0)
1258                         lls->lls_dirty = 0;
1259
1260 stop:
1261                 dt_trans_stop(env, dt, th);
1262                 if (rc != 0) {
1263                         rc1 = rc;
1264                         CDEBUG(D_LFSCK, "%s: layout LFSCK failed to store "
1265                                "the LAST_ID for <seq> "LPX64"(2): rc = %d\n",
1266                                lfsck_lfsck2name(com->lc_lfsck),
1267                                lls->lls_seq, rc1);
1268                 }
1269         }
1270
1271         return rc1;
1272 }
1273
1274 static int
1275 lfsck_layout_lastid_load(const struct lu_env *env,
1276                          struct lfsck_component *com,
1277                          struct lfsck_layout_seq *lls)
1278 {
1279         struct lfsck_instance   *lfsck  = com->lc_lfsck;
1280         struct lfsck_layout     *lo     = com->lc_file_ram;
1281         struct lu_fid           *fid    = &lfsck_env_info(env)->lti_fid;
1282         struct dt_object        *obj;
1283         loff_t                   pos    = 0;
1284         int                      rc;
1285         ENTRY;
1286
1287         lu_last_id_fid(fid, lls->lls_seq, lfsck_dev_idx(lfsck->li_bottom));
1288         obj = dt_locate(env, lfsck->li_bottom, fid);
1289         if (IS_ERR(obj))
1290                 RETURN(PTR_ERR(obj));
1291
1292         /* LAST_ID crashed, to be rebuilt */
1293         if (dt_object_exists(obj) == 0) {
1294                 if (!(lo->ll_flags & LF_CRASHED_LASTID)) {
1295                         LASSERT(lfsck->li_out_notify != NULL);
1296
1297                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
1298                                              LE_LASTID_REBUILDING);
1299                         lo->ll_flags |= LF_CRASHED_LASTID;
1300
1301                         CDEBUG(D_LFSCK, "%s: layout LFSCK cannot find the "
1302                                "LAST_ID file for sequence "LPX64"\n",
1303                                lfsck_lfsck2name(lfsck), lls->lls_seq);
1304
1305                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_DELAY4) &&
1306                             cfs_fail_val > 0) {
1307                                 struct l_wait_info lwi = LWI_TIMEOUT(
1308                                                 cfs_time_seconds(cfs_fail_val),
1309                                                 NULL, NULL);
1310
1311                                 /* Some others may changed the cfs_fail_val
1312                                  * as zero after above check, re-check it for
1313                                  * sure to avoid falling into wait for ever. */
1314                                 if (likely(lwi.lwi_timeout > 0)) {
1315                                         struct ptlrpc_thread *thread =
1316                                                 &lfsck->li_thread;
1317
1318                                         up_write(&com->lc_sem);
1319                                         l_wait_event(thread->t_ctl_waitq,
1320                                                      !thread_is_running(thread),
1321                                                      &lwi);
1322                                         down_write(&com->lc_sem);
1323                                 }
1324                         }
1325                 }
1326
1327                 rc = lfsck_layout_lastid_create(env, lfsck, obj);
1328         } else {
1329                 dt_read_lock(env, obj, 0);
1330                 rc = dt_read(env, obj,
1331                         lfsck_buf_get(env, &lls->lls_lastid, sizeof(__u64)),
1332                         &pos);
1333                 dt_read_unlock(env, obj);
1334                 if (rc != 0 && rc != sizeof(__u64))
1335                         GOTO(out, rc = (rc > 0 ? -EFAULT : rc));
1336
1337                 if (rc == 0 && !(lo->ll_flags & LF_CRASHED_LASTID)) {
1338                         LASSERT(lfsck->li_out_notify != NULL);
1339
1340                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
1341                                              LE_LASTID_REBUILDING);
1342                         lo->ll_flags |= LF_CRASHED_LASTID;
1343
1344                         CDEBUG(D_LFSCK, "%s: layout LFSCK finds invalid "
1345                                "LAST_ID file for the sequence "LPX64
1346                                ": rc = %d\n",
1347                                lfsck_lfsck2name(lfsck), lls->lls_seq, rc);
1348                 }
1349
1350                 lls->lls_lastid = le64_to_cpu(lls->lls_lastid);
1351                 rc = 0;
1352         }
1353
1354         GOTO(out, rc);
1355
1356 out:
1357         if (rc != 0)
1358                 lfsck_object_put(env, obj);
1359         else
1360                 lls->lls_lastid_obj = obj;
1361
1362         return rc;
1363 }
1364
1365 static void lfsck_layout_record_failure(const struct lu_env *env,
1366                                         struct lfsck_instance *lfsck,
1367                                         struct lfsck_layout *lo)
1368 {
1369         __u64 cookie;
1370
1371         lo->ll_objs_failed_phase1++;
1372         cookie = lfsck->li_obj_oit->do_index_ops->dio_it.store(env,
1373                                                         lfsck->li_di_oit);
1374         if (lo->ll_pos_first_inconsistent == 0 ||
1375             lo->ll_pos_first_inconsistent < cookie) {
1376                 lo->ll_pos_first_inconsistent = cookie;
1377
1378                 CDEBUG(D_LFSCK, "%s: layout LFSCK hit first non-repaired "
1379                        "inconsistency at the pos ["LPU64"]\n",
1380                        lfsck_lfsck2name(lfsck),
1381                        lo->ll_pos_first_inconsistent);
1382         }
1383 }
1384
1385 static int lfsck_layout_double_scan_result(const struct lu_env *env,
1386                                            struct lfsck_component *com,
1387                                            int rc)
1388 {
1389         struct lfsck_instance   *lfsck = com->lc_lfsck;
1390         struct lfsck_layout     *lo    = com->lc_file_ram;
1391
1392         down_write(&com->lc_sem);
1393         lo->ll_run_time_phase2 += cfs_duration_sec(cfs_time_current() +
1394                                 HALF_SEC - lfsck->li_time_last_checkpoint);
1395         lo->ll_time_last_checkpoint = cfs_time_current_sec();
1396         lo->ll_objs_checked_phase2 += com->lc_new_checked;
1397
1398         if (rc > 0) {
1399                 if (lo->ll_flags & LF_INCOMPLETE) {
1400                         lo->ll_status = LS_PARTIAL;
1401                 } else {
1402                         if (lfsck->li_master) {
1403                                 struct lfsck_assistant_data *lad = com->lc_data;
1404
1405                                 if (lad->lad_incomplete)
1406                                         lo->ll_status = LS_PARTIAL;
1407                                 else
1408                                         lo->ll_status = LS_COMPLETED;
1409                         } else {
1410                                 lo->ll_status = LS_COMPLETED;
1411                         }
1412                 }
1413                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN))
1414                         lo->ll_flags &= ~(LF_SCANNED_ONCE | LF_INCONSISTENT);
1415                 lo->ll_time_last_complete = lo->ll_time_last_checkpoint;
1416                 lo->ll_success_count++;
1417         } else if (rc == 0) {
1418                 if (lfsck->li_status != 0)
1419                         lo->ll_status = lfsck->li_status;
1420                 else
1421                         lo->ll_status = LS_STOPPED;
1422         } else {
1423                 lo->ll_status = LS_FAILED;
1424         }
1425
1426         rc = lfsck_layout_store(env, com);
1427         up_write(&com->lc_sem);
1428
1429         return rc;
1430 }
1431
1432 static int lfsck_layout_trans_stop(const struct lu_env *env,
1433                                    struct dt_device *dev,
1434                                    struct thandle *handle, int result)
1435 {
1436         int rc;
1437
1438         handle->th_result = result;
1439         rc = dt_trans_stop(env, dev, handle);
1440         if (rc > 0)
1441                 rc = 0;
1442         else if (rc == 0)
1443                 rc = 1;
1444
1445         return rc;
1446 }
1447
1448 /**
1449  * Get the system default stripe size.
1450  *
1451  * \param[in] env       pointer to the thread context
1452  * \param[in] lfsck     pointer to the lfsck instance
1453  * \param[out] size     pointer to the default stripe size
1454  *
1455  * \retval              0 for success
1456  * \retval              negative error number on failure
1457  */
1458 static int lfsck_layout_get_def_stripesize(const struct lu_env *env,
1459                                            struct lfsck_instance *lfsck,
1460                                            __u32 *size)
1461 {
1462         struct lov_user_md      *lum = &lfsck_env_info(env)->lti_lum;
1463         struct dt_object        *root;
1464         int                      rc;
1465
1466         root = dt_locate(env, lfsck->li_next, &lfsck->li_local_root_fid);
1467         if (IS_ERR(root))
1468                 return PTR_ERR(root);
1469
1470         /* Get the default stripe size via xattr_get on the backend root. */
1471         rc = dt_xattr_get(env, root, lfsck_buf_get(env, lum, sizeof(*lum)),
1472                           XATTR_NAME_LOV, BYPASS_CAPA);
1473         if (rc > 0) {
1474                 /* The lum->lmm_stripe_size is LE mode. The *size also
1475                  * should be LE mode. So it is unnecessary to convert. */
1476                 *size = lum->lmm_stripe_size;
1477                 rc = 0;
1478         } else if (unlikely(rc == 0)) {
1479                 rc = -EINVAL;
1480         }
1481
1482         lfsck_object_put(env, root);
1483
1484         return rc;
1485 }
1486
1487 /**
1488  * \retval       +1: repaired
1489  * \retval        0: did nothing
1490  * \retval      -ve: on error
1491  */
1492 static int lfsck_layout_refill_lovea(const struct lu_env *env,
1493                                      struct thandle *handle,
1494                                      struct dt_object *parent,
1495                                      struct lu_fid *cfid,
1496                                      struct lu_buf *buf,
1497                                      struct lov_ost_data_v1 *slot,
1498                                      int fl, __u32 ost_idx)
1499 {
1500         struct ost_id           *oi     = &lfsck_env_info(env)->lti_oi;
1501         struct lov_mds_md_v1    *lmm    = buf->lb_buf;
1502         struct lu_buf            ea_buf;
1503         int                      rc;
1504         __u32                    magic;
1505         __u16                    count;
1506
1507         magic = le32_to_cpu(lmm->lmm_magic);
1508         count = le16_to_cpu(lmm->lmm_stripe_count);
1509
1510         fid_to_ostid(cfid, oi);
1511         ostid_cpu_to_le(oi, &slot->l_ost_oi);
1512         slot->l_ost_gen = cpu_to_le32(0);
1513         slot->l_ost_idx = cpu_to_le32(ost_idx);
1514
1515         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_HOLE) {
1516                 struct lov_ost_data_v1 *objs;
1517                 int                     i;
1518
1519                 if (magic == LOV_MAGIC_V1)
1520                         objs = &lmm->lmm_objects[0];
1521                 else
1522                         objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
1523                 for (i = 0; i < count; i++, objs++) {
1524                         if (objs != slot && lovea_slot_is_dummy(objs))
1525                                 break;
1526                 }
1527
1528                 /* If the @slot is the last dummy slot to be refilled,
1529                  * then drop LOV_PATTERN_F_HOLE from lmm::lmm_pattern. */
1530                 if (i == count)
1531                         lmm->lmm_pattern &= ~cpu_to_le32(LOV_PATTERN_F_HOLE);
1532         }
1533
1534         lfsck_buf_init(&ea_buf, lmm, lov_mds_md_size(count, magic));
1535         rc = dt_xattr_set(env, parent, &ea_buf, XATTR_NAME_LOV, fl, handle,
1536                           BYPASS_CAPA);
1537         if (rc == 0)
1538                 rc = 1;
1539
1540         return rc;
1541 }
1542
1543 /**
1544  * \retval       +1: repaired
1545  * \retval        0: did nothing
1546  * \retval      -ve: on error
1547  */
1548 static int lfsck_layout_extend_lovea(const struct lu_env *env,
1549                                      struct lfsck_instance *lfsck,
1550                                      struct thandle *handle,
1551                                      struct dt_object *parent,
1552                                      struct lu_fid *cfid,
1553                                      struct lu_buf *buf, int fl,
1554                                      __u32 ost_idx, __u32 ea_off, bool reset)
1555 {
1556         struct lov_mds_md_v1    *lmm    = buf->lb_buf;
1557         struct lov_ost_data_v1  *objs;
1558         int                      rc;
1559         __u16                    count;
1560         bool                     hole   = false;
1561         ENTRY;
1562
1563         if (fl == LU_XATTR_CREATE || reset) {
1564                 __u32 pattern = LOV_PATTERN_RAID0;
1565
1566                 count = ea_off + 1;
1567                 LASSERT(buf->lb_len >= lov_mds_md_size(count, LOV_MAGIC_V1));
1568
1569                 if (ea_off != 0 || reset) {
1570                         pattern |= LOV_PATTERN_F_HOLE;
1571                         hole = true;
1572                 }
1573
1574                 memset(lmm, 0, buf->lb_len);
1575                 lmm->lmm_magic = cpu_to_le32(LOV_MAGIC_V1);
1576                 lmm->lmm_pattern = cpu_to_le32(pattern);
1577                 fid_to_lmm_oi(lfsck_dto2fid(parent), &lmm->lmm_oi);
1578                 lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
1579
1580                 rc = lfsck_layout_get_def_stripesize(env, lfsck,
1581                                                      &lmm->lmm_stripe_size);
1582                 if (rc != 0)
1583                         RETURN(rc);
1584
1585                 objs = &lmm->lmm_objects[ea_off];
1586         } else {
1587                 __u32   magic = le32_to_cpu(lmm->lmm_magic);
1588                 int     gap;
1589
1590                 count = le16_to_cpu(lmm->lmm_stripe_count);
1591                 if (magic == LOV_MAGIC_V1)
1592                         objs = &lmm->lmm_objects[count];
1593                 else
1594                         objs = &((struct lov_mds_md_v3 *)lmm)->
1595                                                         lmm_objects[count];
1596
1597                 gap = ea_off - count;
1598                 if (gap >= 0)
1599                         count = ea_off + 1;
1600                 LASSERT(buf->lb_len >= lov_mds_md_size(count, magic));
1601
1602                 if (gap > 0) {
1603                         memset(objs, 0, gap * sizeof(*objs));
1604                         lmm->lmm_pattern |= cpu_to_le32(LOV_PATTERN_F_HOLE);
1605                         hole = true;
1606                 }
1607
1608                 lmm->lmm_layout_gen =
1609                             cpu_to_le16(le16_to_cpu(lmm->lmm_layout_gen) + 1);
1610                 objs += gap;
1611         }
1612
1613         lmm->lmm_stripe_count = cpu_to_le16(count);
1614         rc = lfsck_layout_refill_lovea(env, handle, parent, cfid, buf, objs,
1615                                        fl, ost_idx);
1616
1617         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant extend layout EA for "
1618                DFID": parent "DFID", OST-index %u, stripe-index %u, fl %d, "
1619                "reset %s, %s LOV EA hole: rc = %d\n",
1620                lfsck_lfsck2name(lfsck), PFID(cfid), PFID(lfsck_dto2fid(parent)),
1621                ost_idx, ea_off, fl, reset ? "yes" : "no",
1622                hole ? "with" : "without", rc);
1623
1624         RETURN(rc);
1625 }
1626
1627 /**
1628  * \retval       +1: repaired
1629  * \retval        0: did nothing
1630  * \retval      -ve: on error
1631  */
1632 static int lfsck_layout_update_pfid(const struct lu_env *env,
1633                                     struct lfsck_component *com,
1634                                     struct dt_object *parent,
1635                                     struct lu_fid *cfid,
1636                                     struct dt_device *cdev, __u32 ea_off)
1637 {
1638         struct filter_fid       *pfid   = &lfsck_env_info(env)->lti_new_pfid;
1639         struct dt_object        *child;
1640         struct thandle          *handle;
1641         const struct lu_fid     *tfid   = lu_object_fid(&parent->do_lu);
1642         struct lu_buf           *buf;
1643         int                      rc     = 0;
1644         ENTRY;
1645
1646         child = lfsck_object_find_by_dev(env, cdev, cfid);
1647         if (IS_ERR(child))
1648                 RETURN(PTR_ERR(child));
1649
1650         handle = dt_trans_create(env, cdev);
1651         if (IS_ERR(handle))
1652                 GOTO(out, rc = PTR_ERR(handle));
1653
1654         pfid->ff_parent.f_seq = cpu_to_le64(tfid->f_seq);
1655         pfid->ff_parent.f_oid = cpu_to_le32(tfid->f_oid);
1656         /* Currently, the filter_fid::ff_parent::f_ver is not the real parent
1657          * MDT-object's FID::f_ver, instead it is the OST-object index in its
1658          * parent MDT-object's layout EA. */
1659         pfid->ff_parent.f_stripe_idx = cpu_to_le32(ea_off);
1660         buf = lfsck_buf_get(env, pfid, sizeof(struct filter_fid));
1661
1662         rc = dt_declare_xattr_set(env, child, buf, XATTR_NAME_FID, 0, handle);
1663         if (rc != 0)
1664                 GOTO(stop, rc);
1665
1666         rc = dt_trans_start(env, cdev, handle);
1667         if (rc != 0)
1668                 GOTO(stop, rc);
1669
1670         rc = dt_xattr_set(env, child, buf, XATTR_NAME_FID, 0, handle,
1671                           BYPASS_CAPA);
1672
1673         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1674
1675 stop:
1676         dt_trans_stop(env, cdev, handle);
1677
1678 out:
1679         lu_object_put(env, &child->do_lu);
1680
1681         return rc;
1682 }
1683
1684 /**
1685  * This function will create the MDT-object with the given (partial) LOV EA.
1686  *
1687  * Under some data corruption cases, the MDT-object of the file may be lost,
1688  * but its OST-objects, or some of them are there. The layout LFSCK needs to
1689  * re-create the MDT-object with the orphan OST-object(s) information.
1690  *
1691  * On the other hand, the LFSCK may has created some OST-object for repairing
1692  * dangling LOV EA reference, but as the LFSCK processing, it may find that
1693  * the old OST-object is there and should replace the former new created OST
1694  * object. Unfortunately, some others have modified such newly created object.
1695  * To keep the data (both new and old), the LFSCK will create MDT-object with
1696  * new FID to reference the original OST-object.
1697  *
1698  * \param[in] env       pointer to the thread context
1699  * \param[in] com       pointer to the lfsck component
1700  * \param[in] ltd       pointer to target device descriptor
1701  * \param[in] rec       pointer to the record for the orphan OST-object
1702  * \param[in] cfid      pointer to FID for the orphan OST-object
1703  * \param[in] infix     additional information, such as the FID for original
1704  *                      MDT-object and the stripe offset in the LOV EA
1705  * \param[in] type      the type for describing why the orphan MDT-object is
1706  *                      created. The rules are as following:
1707  *
1708  *  type "C":           Multiple OST-objects claim the same MDT-object and the
1709  *                      same slot in the layout EA. Then the LFSCK will create
1710  *                      new MDT-object(s) to hold the conflict OST-object(s).
1711  *
1712  *  type "N":           The orphan OST-object does not know which one was the
1713  *                      real parent MDT-object, so the LFSCK uses new FID for
1714  *                      its parent MDT-object.
1715  *
1716  *  type "R":           The orphan OST-object knows its parent MDT-object FID,
1717  *                      but does not know the position (the file name) in the
1718  *                      layout.
1719  *
1720  *  type "D":           The MDT-object is a directory, it may knows its parent
1721  *                      but because there is no valid linkEA, the LFSCK cannot
1722  *                      know where to put it back to the namespace.
1723  *  type "O":           The MDT-object has no linkEA, and there is no name
1724  *                      entry that references the MDT-object.
1725  *
1726  *  type "P":           The orphan object to be created was a parent directory
1727  *                      of some MDT-object which linkEA shows that the @orphan
1728  *                      object is missing.
1729  *
1730  * The orphan name will be like:
1731  * ${FID}-${infix}-${type}-${conflict_version}
1732  *
1733  * \param[in] ea_off    the stripe offset in the LOV EA
1734  *
1735  * \retval              positive on repaired something
1736  * \retval              0 if needs to repair nothing
1737  * \retval              negative error number on failure
1738  */
1739 static int lfsck_layout_recreate_parent(const struct lu_env *env,
1740                                         struct lfsck_component *com,
1741                                         struct lfsck_tgt_desc *ltd,
1742                                         struct lu_orphan_rec *rec,
1743                                         struct lu_fid *cfid,
1744                                         const char *infix,
1745                                         const char *type,
1746                                         __u32 ea_off)
1747 {
1748         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1749         struct dt_insert_rec            *dtrec  = &info->lti_dt_rec;
1750         char                            *name   = info->lti_key;
1751         struct lu_attr                  *la     = &info->lti_la;
1752         struct dt_object_format         *dof    = &info->lti_dof;
1753         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1754         struct lu_fid                   *pfid   = &rec->lor_fid;
1755         struct lu_fid                   *tfid   = &info->lti_fid3;
1756         struct dt_device                *next   = lfsck->li_next;
1757         struct dt_object                *pobj   = NULL;
1758         struct dt_object                *cobj   = NULL;
1759         struct thandle                  *th     = NULL;
1760         struct lu_buf                    pbuf   = { NULL };
1761         struct lu_buf                   *ea_buf = &info->lti_big_buf;
1762         struct lu_buf                    lov_buf;
1763         struct lustre_handle             lh     = { 0 };
1764         struct linkea_data               ldata  = { NULL };
1765         struct lu_buf                    linkea_buf;
1766         const struct lu_name            *pname;
1767         int                              size   = 0;
1768         int                              idx    = 0;
1769         int                              rc     = 0;
1770         ENTRY;
1771
1772         if (unlikely(lfsck->li_lpf_obj == NULL))
1773                 GOTO(log, rc = -ENXIO);
1774
1775         if (fid_is_zero(pfid)) {
1776                 struct filter_fid *ff = &info->lti_new_pfid;
1777
1778                 rc = lfsck_fid_alloc(env, lfsck, pfid, false);
1779                 if (rc != 0)
1780                         RETURN(rc);
1781
1782                 ff->ff_parent.f_seq = cpu_to_le64(pfid->f_seq);
1783                 ff->ff_parent.f_oid = cpu_to_le32(pfid->f_oid);
1784                 /* Currently, the filter_fid::ff_parent::f_ver is not the
1785                  * real parent MDT-object's FID::f_ver, instead it is the
1786                  * OST-object index in its parent MDT-object's layout EA. */
1787                 ff->ff_parent.f_stripe_idx = cpu_to_le32(ea_off);
1788                 lfsck_buf_init(&pbuf, ff, sizeof(struct filter_fid));
1789                 cobj = lfsck_object_find_by_dev(env, ltd->ltd_tgt, cfid);
1790                 if (IS_ERR(cobj))
1791                         GOTO(log, rc = PTR_ERR(cobj));
1792         }
1793
1794         pobj = lfsck_object_find_by_dev(env, lfsck->li_bottom, pfid);
1795         if (IS_ERR(pobj))
1796                 GOTO(put, rc = PTR_ERR(pobj));
1797
1798         LASSERT(infix != NULL);
1799         LASSERT(type != NULL);
1800
1801         do {
1802                 snprintf(name, NAME_MAX, DFID"%s-%s-%d", PFID(pfid), infix,
1803                          type, idx++);
1804                 rc = dt_lookup(env, lfsck->li_lpf_obj, (struct dt_rec *)tfid,
1805                                (const struct dt_key *)name, BYPASS_CAPA);
1806                 if (rc != 0 && rc != -ENOENT)
1807                         GOTO(put, rc);
1808         } while (rc == 0);
1809
1810         rc = linkea_data_new(&ldata,
1811                              &lfsck_env_info(env)->lti_linkea_buf);
1812         if (rc != 0)
1813                 GOTO(put, rc);
1814
1815         pname = lfsck_name_get_const(env, name, strlen(name));
1816         rc = linkea_add_buf(&ldata, pname, lfsck_dto2fid(lfsck->li_lpf_obj));
1817         if (rc != 0)
1818                 GOTO(put, rc);
1819
1820         memset(la, 0, sizeof(*la));
1821         la->la_uid = rec->lor_uid;
1822         la->la_gid = rec->lor_gid;
1823         la->la_mode = S_IFREG | S_IRUSR;
1824         la->la_valid = LA_MODE | LA_UID | LA_GID;
1825
1826         memset(dof, 0, sizeof(*dof));
1827         dof->dof_type = dt_mode_to_dft(S_IFREG);
1828
1829         size = lov_mds_md_size(ea_off + 1, LOV_MAGIC_V1);
1830         if (ea_buf->lb_len < size) {
1831                 lu_buf_realloc(ea_buf, size);
1832                 if (ea_buf->lb_buf == NULL)
1833                         GOTO(put, rc = -ENOMEM);
1834         }
1835
1836         /* Hold update lock on the .lustre/lost+found/MDTxxxx/.
1837          *
1838          * XXX: Currently, we do not grab the PDO lock as normal create cases,
1839          *      because creating MDT-object for orphan OST-object is rare, we
1840          *      do not much care about the performance. It can be improved in
1841          *      the future when needed. */
1842         rc = lfsck_ibits_lock(env, lfsck, lfsck->li_lpf_obj, &lh,
1843                               MDS_INODELOCK_UPDATE, LCK_EX);
1844         if (rc != 0)
1845                 GOTO(put, rc);
1846
1847         th = dt_trans_create(env, next);
1848         if (IS_ERR(th))
1849                 GOTO(unlock, rc = PTR_ERR(th));
1850
1851         /* 1a. Update OST-object's parent information remotely.
1852          *
1853          * If other subsequent modifications failed, then next LFSCK scanning
1854          * will process the OST-object as orphan again with known parent FID. */
1855         if (cobj != NULL) {
1856                 rc = dt_declare_xattr_set(env, cobj, &pbuf, XATTR_NAME_FID,
1857                                           0, th);
1858                 if (rc != 0)
1859                         GOTO(stop, rc);
1860         }
1861
1862         /* 2a. Create the MDT-object locally. */
1863         rc = dt_declare_create(env, pobj, la, NULL, dof, th);
1864         if (rc != 0)
1865                 GOTO(stop, rc);
1866
1867         /* 3a. Add layout EA for the MDT-object. */
1868         lfsck_buf_init(&lov_buf, ea_buf->lb_buf, size);
1869         rc = dt_declare_xattr_set(env, pobj, &lov_buf, XATTR_NAME_LOV,
1870                                   LU_XATTR_CREATE, th);
1871         if (rc != 0)
1872                 GOTO(stop, rc);
1873
1874         /* 4a. Insert the MDT-object to .lustre/lost+found/MDTxxxx/ */
1875         dtrec->rec_fid = pfid;
1876         dtrec->rec_type = S_IFREG;
1877         rc = dt_declare_insert(env, lfsck->li_lpf_obj,
1878                                (const struct dt_rec *)dtrec,
1879                                (const struct dt_key *)name, th);
1880         if (rc != 0)
1881                 GOTO(stop, rc);
1882
1883         /* 5a. insert linkEA for parent. */
1884         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
1885                        ldata.ld_leh->leh_len);
1886         rc = dt_declare_xattr_set(env, pobj, &linkea_buf,
1887                                   XATTR_NAME_LINK, 0, th);
1888         if (rc != 0)
1889                 GOTO(stop, rc);
1890
1891         rc = dt_trans_start(env, next, th);
1892         if (rc != 0)
1893                 GOTO(stop, rc);
1894
1895         /* 1b. Update OST-object's parent information remotely. */
1896         if (cobj != NULL) {
1897                 rc = dt_xattr_set(env, cobj, &pbuf, XATTR_NAME_FID, 0, th,
1898                                   BYPASS_CAPA);
1899                 if (rc != 0)
1900                         GOTO(stop, rc);
1901         }
1902
1903         dt_write_lock(env, pobj, 0);
1904         /* 2b. Create the MDT-object locally. */
1905         rc = dt_create(env, pobj, la, NULL, dof, th);
1906         if (rc == 0)
1907                 /* 3b. Add layout EA for the MDT-object. */
1908                 rc = lfsck_layout_extend_lovea(env, lfsck, th, pobj, cfid,
1909                                                &lov_buf, LU_XATTR_CREATE,
1910                                                ltd->ltd_index, ea_off, false);
1911         dt_write_unlock(env, pobj);
1912         if (rc < 0)
1913                 GOTO(stop, rc);
1914
1915         /* 4b. Insert the MDT-object to .lustre/lost+found/MDTxxxx/ */
1916         rc = dt_insert(env, lfsck->li_lpf_obj, (const struct dt_rec *)dtrec,
1917                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
1918         if (rc != 0)
1919                 GOTO(stop, rc);
1920
1921         /* 5b. insert linkEA for parent. */
1922         rc = dt_xattr_set(env, pobj, &linkea_buf,
1923                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
1924
1925         GOTO(stop, rc);
1926
1927 stop:
1928         dt_trans_stop(env, next, th);
1929
1930 unlock:
1931         lfsck_ibits_unlock(&lh, LCK_EX);
1932
1933 put:
1934         if (cobj != NULL && !IS_ERR(cobj))
1935                 lu_object_put(env, &cobj->do_lu);
1936         if (pobj != NULL && !IS_ERR(pobj))
1937                 lu_object_put(env, &pobj->do_lu);
1938
1939 log:
1940         if (rc < 0)
1941                 CDEBUG(D_LFSCK, "%s layout LFSCK assistant failed to "
1942                        "recreate the lost MDT-object: parent "DFID
1943                        ", child "DFID", OST-index %u, stripe-index %u, "
1944                        "infix %s, type %s: rc = %d\n",
1945                        lfsck_lfsck2name(lfsck), PFID(pfid), PFID(cfid),
1946                        ltd->ltd_index, ea_off, infix, type, rc);
1947
1948         return rc >= 0 ? 1 : rc;
1949 }
1950
1951 static int lfsck_layout_master_conditional_destroy(const struct lu_env *env,
1952                                                    struct lfsck_component *com,
1953                                                    const struct lu_fid *fid,
1954                                                    __u32 index)
1955 {
1956         struct lfsck_thread_info *info  = lfsck_env_info(env);
1957         struct lfsck_request     *lr    = &info->lti_lr;
1958         struct lfsck_instance    *lfsck = com->lc_lfsck;
1959         struct lfsck_tgt_desc    *ltd;
1960         struct ptlrpc_request    *req;
1961         struct lfsck_request     *tmp;
1962         struct obd_export        *exp;
1963         int                       rc    = 0;
1964         ENTRY;
1965
1966         ltd = lfsck_tgt_get(&lfsck->li_ost_descs, index);
1967         if (unlikely(ltd == NULL))
1968                 RETURN(-ENXIO);
1969
1970         exp = ltd->ltd_exp;
1971         if (!(exp_connect_flags(exp) & OBD_CONNECT_LFSCK))
1972                 GOTO(put, rc = -EOPNOTSUPP);
1973
1974         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LFSCK_NOTIFY);
1975         if (req == NULL)
1976                 GOTO(put, rc = -ENOMEM);
1977
1978         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_NOTIFY);
1979         if (rc != 0) {
1980                 ptlrpc_request_free(req);
1981
1982                 GOTO(put, rc);
1983         }
1984
1985         memset(lr, 0, sizeof(*lr));
1986         lr->lr_event = LE_CONDITIONAL_DESTROY;
1987         lr->lr_active = LFSCK_TYPE_LAYOUT;
1988         lr->lr_fid = *fid;
1989
1990         tmp = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
1991         *tmp = *lr;
1992         ptlrpc_request_set_replen(req);
1993
1994         rc = ptlrpc_queue_wait(req);
1995         ptlrpc_req_finished(req);
1996
1997         GOTO(put, rc);
1998
1999 put:
2000         lfsck_tgt_put(ltd);
2001
2002         return rc;
2003 }
2004
2005 static int lfsck_layout_slave_conditional_destroy(const struct lu_env *env,
2006                                                   struct lfsck_component *com,
2007                                                   struct lfsck_request *lr)
2008 {
2009         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2010         struct lu_attr                  *la     = &info->lti_la;
2011         ldlm_policy_data_t              *policy = &info->lti_policy;
2012         struct ldlm_res_id              *resid  = &info->lti_resid;
2013         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2014         struct dt_device                *dev    = lfsck->li_bottom;
2015         struct lu_fid                   *fid    = &lr->lr_fid;
2016         struct dt_object                *obj;
2017         struct thandle                  *th     = NULL;
2018         struct lustre_handle             lh     = { 0 };
2019         __u64                            flags  = 0;
2020         int                              rc     = 0;
2021         ENTRY;
2022
2023         obj = lfsck_object_find_by_dev(env, dev, fid);
2024         if (IS_ERR(obj))
2025                 RETURN(PTR_ERR(obj));
2026
2027         dt_read_lock(env, obj, 0);
2028         if (dt_object_exists(obj) == 0 ||
2029             lfsck_is_dead_obj(obj)) {
2030                 dt_read_unlock(env, obj);
2031
2032                 GOTO(put, rc = -ENOENT);
2033         }
2034
2035         /* Get obj's attr without lock firstly. */
2036         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
2037         dt_read_unlock(env, obj);
2038         if (rc != 0)
2039                 GOTO(put, rc);
2040
2041         if (likely(la->la_ctime != 0 || la->la_mode & S_ISUID))
2042                 GOTO(put, rc = -ETXTBSY);
2043
2044         /* Acquire extent lock on [0, EOF] to sync with all possible written. */
2045         LASSERT(lfsck->li_namespace != NULL);
2046
2047         memset(policy, 0, sizeof(*policy));
2048         policy->l_extent.end = OBD_OBJECT_EOF;
2049         ost_fid_build_resid(fid, resid);
2050         rc = ldlm_cli_enqueue_local(lfsck->li_namespace, resid, LDLM_EXTENT,
2051                                     policy, LCK_EX, &flags, ldlm_blocking_ast,
2052                                     ldlm_completion_ast, NULL, NULL, 0,
2053                                     LVB_T_NONE, NULL, &lh);
2054         if (rc != ELDLM_OK)
2055                 GOTO(put, rc = -EIO);
2056
2057         dt_write_lock(env, obj, 0);
2058         /* Get obj's attr within lock again. */
2059         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
2060         if (rc != 0)
2061                 GOTO(unlock, rc);
2062
2063         if (la->la_ctime != 0)
2064                 GOTO(unlock, rc = -ETXTBSY);
2065
2066         th = dt_trans_create(env, dev);
2067         if (IS_ERR(th))
2068                 GOTO(unlock, rc = PTR_ERR(th));
2069
2070         rc = dt_declare_ref_del(env, obj, th);
2071         if (rc != 0)
2072                 GOTO(stop, rc);
2073
2074         rc = dt_declare_destroy(env, obj, th);
2075         if (rc != 0)
2076                 GOTO(stop, rc);
2077
2078         rc = dt_trans_start_local(env, dev, th);
2079         if (rc != 0)
2080                 GOTO(stop, rc);
2081
2082         rc = dt_ref_del(env, obj, th);
2083         if (rc != 0)
2084                 GOTO(stop, rc);
2085
2086         rc = dt_destroy(env, obj, th);
2087         if (rc == 0)
2088                 CDEBUG(D_LFSCK, "%s: layout LFSCK destroyed the empty "
2089                        "OST-object "DFID" that was created for reparing "
2090                        "dangling referenced case. But the original missing "
2091                        "OST-object is found now.\n",
2092                        lfsck_lfsck2name(lfsck), PFID(fid));
2093
2094         GOTO(stop, rc);
2095
2096 stop:
2097         dt_trans_stop(env, dev, th);
2098
2099 unlock:
2100         dt_write_unlock(env, obj);
2101         ldlm_lock_decref(&lh, LCK_EX);
2102
2103 put:
2104         lu_object_put(env, &obj->do_lu);
2105
2106         return rc;
2107 }
2108
2109 /**
2110  * Some OST-object has occupied the specified layout EA slot.
2111  * Such OST-object may be generated by the LFSCK when repair
2112  * dangling referenced MDT-object, which can be indicated by
2113  * attr::la_ctime == 0 but without S_ISUID in la_mode. If it
2114  * is true and such OST-object has not been modified yet, we
2115  * will replace it with the orphan OST-object; otherwise the
2116  * LFSCK will create new MDT-object to reference the orphan.
2117  *
2118  * \retval       +1: repaired
2119  * \retval        0: did nothing
2120  * \retval      -ve: on error
2121  */
2122 static int lfsck_layout_conflict_create(const struct lu_env *env,
2123                                         struct lfsck_component *com,
2124                                         struct lfsck_tgt_desc *ltd,
2125                                         struct lu_orphan_rec *rec,
2126                                         struct dt_object *parent,
2127                                         struct lu_fid *cfid,
2128                                         struct lu_buf *ea_buf,
2129                                         struct lov_ost_data_v1 *slot,
2130                                         __u32 ea_off)
2131 {
2132         struct lfsck_thread_info *info          = lfsck_env_info(env);
2133         struct lu_fid            *cfid2         = &info->lti_fid2;
2134         struct ost_id            *oi            = &info->lti_oi;
2135         struct lov_mds_md_v1     *lmm           = ea_buf->lb_buf;
2136         struct dt_device         *dev           = com->lc_lfsck->li_bottom;
2137         struct thandle           *th            = NULL;
2138         struct lustre_handle      lh            = { 0 };
2139         __u32                     ost_idx2      = le32_to_cpu(slot->l_ost_idx);
2140         int                       rc            = 0;
2141         ENTRY;
2142
2143         ostid_le_to_cpu(&slot->l_ost_oi, oi);
2144         rc = ostid_to_fid(cfid2, oi, ost_idx2);
2145         if (rc != 0)
2146                 GOTO(out, rc);
2147
2148         /* Hold layout lock on the parent to prevent others to access. */
2149         rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
2150                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2151                               LCK_EX);
2152         if (rc != 0)
2153                 GOTO(out, rc);
2154
2155         rc = lfsck_layout_master_conditional_destroy(env, com, cfid2, ost_idx2);
2156
2157         /* If the conflict OST-obejct is not created for fixing dangling
2158          * referenced MDT-object in former LFSCK check/repair, or it has
2159          * been modified by others, then we cannot destroy it. Re-create
2160          * a new MDT-object for the orphan OST-object. */
2161         if (rc == -ETXTBSY) {
2162                 /* No need the layout lock on the original parent. */
2163                 lfsck_ibits_unlock(&lh, LCK_EX);
2164
2165                 fid_zero(&rec->lor_fid);
2166                 snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2167                          "-"DFID"-%x", PFID(lu_object_fid(&parent->do_lu)),
2168                          ea_off);
2169                 rc = lfsck_layout_recreate_parent(env, com, ltd, rec, cfid,
2170                                                 info->lti_tmpbuf, "C", ea_off);
2171
2172                 RETURN(rc);
2173         }
2174
2175         if (rc != 0 && rc != -ENOENT)
2176                 GOTO(unlock, rc);
2177
2178         th = dt_trans_create(env, dev);
2179         if (IS_ERR(th))
2180                 GOTO(unlock, rc = PTR_ERR(th));
2181
2182         rc = dt_declare_xattr_set(env, parent, ea_buf, XATTR_NAME_LOV,
2183                                   LU_XATTR_REPLACE, th);
2184         if (rc != 0)
2185                 GOTO(stop, rc);
2186
2187         rc = dt_trans_start_local(env, dev, th);
2188         if (rc != 0)
2189                 GOTO(stop, rc);
2190
2191         dt_write_lock(env, parent, 0);
2192         lmm->lmm_layout_gen = cpu_to_le16(le16_to_cpu(lmm->lmm_layout_gen) + 1);
2193         rc = lfsck_layout_refill_lovea(env, th, parent, cfid, ea_buf, slot,
2194                                        LU_XATTR_REPLACE, ltd->ltd_index);
2195         dt_write_unlock(env, parent);
2196
2197         GOTO(stop, rc);
2198
2199 stop:
2200         dt_trans_stop(env, dev, th);
2201
2202 unlock:
2203         lfsck_ibits_unlock(&lh, LCK_EX);
2204
2205 out:
2206         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant replaced the conflict "
2207                "OST-object "DFID" on the OST %x with the orphan "DFID" on "
2208                "the OST %x: parent "DFID", stripe-index %u: rc = %d\n",
2209                lfsck_lfsck2name(com->lc_lfsck), PFID(cfid2), ost_idx2,
2210                PFID(cfid), ltd->ltd_index, PFID(lfsck_dto2fid(parent)),
2211                ea_off, rc);
2212
2213         return rc >= 0 ? 1 : rc;
2214 }
2215
2216 /**
2217  * \retval       +1: repaired
2218  * \retval        0: did nothing
2219  * \retval      -ve: on error
2220  */
2221 static int lfsck_layout_recreate_lovea(const struct lu_env *env,
2222                                        struct lfsck_component *com,
2223                                        struct lfsck_tgt_desc *ltd,
2224                                        struct lu_orphan_rec *rec,
2225                                        struct dt_object *parent,
2226                                        struct lu_fid *cfid,
2227                                        __u32 ost_idx, __u32 ea_off)
2228 {
2229         struct lfsck_thread_info *info          = lfsck_env_info(env);
2230         struct lu_buf            *buf           = &info->lti_big_buf;
2231         struct lu_fid            *fid           = &info->lti_fid2;
2232         struct ost_id            *oi            = &info->lti_oi;
2233         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2234         struct dt_device         *dt            = lfsck->li_bottom;
2235         struct lfsck_bookmark    *bk            = &lfsck->li_bookmark_ram;
2236         struct thandle            *handle       = NULL;
2237         size_t                    lovea_size;
2238         struct lov_mds_md_v1     *lmm;
2239         struct lov_ost_data_v1   *objs;
2240         struct lustre_handle      lh            = { 0 };
2241         __u32                     magic;
2242         int                       fl            = 0;
2243         int                       rc            = 0;
2244         int                       rc1;
2245         int                       i;
2246         __u16                     count;
2247         bool                      locked        = false;
2248         ENTRY;
2249
2250         rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
2251                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2252                               LCK_EX);
2253         if (rc != 0) {
2254                 CDEBUG(D_LFSCK, "%s: layout LFSCK assistant failed to recreate "
2255                        "LOV EA for "DFID": parent "DFID", OST-index %u, "
2256                        "stripe-index %u: rc = %d\n",
2257                        lfsck_lfsck2name(lfsck), PFID(cfid),
2258                        PFID(lfsck_dto2fid(parent)), ost_idx, ea_off, rc);
2259
2260                 RETURN(rc);
2261         }
2262
2263 again:
2264         if (locked) {
2265                 dt_write_unlock(env, parent);
2266                 locked = false;
2267         }
2268
2269         if (handle != NULL) {
2270                 dt_trans_stop(env, dt, handle);
2271                 handle = NULL;
2272         }
2273
2274         if (rc < 0)
2275                 GOTO(unlock_layout, rc);
2276
2277         lovea_size = rc;
2278         if (buf->lb_len < lovea_size) {
2279                 lu_buf_realloc(buf, lovea_size);
2280                 if (buf->lb_buf == NULL)
2281                         GOTO(unlock_layout, rc = -ENOMEM);
2282         }
2283
2284         if (!(bk->lb_param & LPF_DRYRUN)) {
2285                 handle = dt_trans_create(env, dt);
2286                 if (IS_ERR(handle))
2287                         GOTO(unlock_layout, rc = PTR_ERR(handle));
2288
2289                 rc = dt_declare_xattr_set(env, parent, buf, XATTR_NAME_LOV,
2290                                           fl, handle);
2291                 if (rc != 0)
2292                         GOTO(stop, rc);
2293
2294                 rc = dt_trans_start_local(env, dt, handle);
2295                 if (rc != 0)
2296                         GOTO(stop, rc);
2297         }
2298
2299         dt_write_lock(env, parent, 0);
2300         locked = true;
2301         rc = dt_xattr_get(env, parent, buf, XATTR_NAME_LOV, BYPASS_CAPA);
2302         if (rc == -ERANGE) {
2303                 rc = dt_xattr_get(env, parent, &LU_BUF_NULL, XATTR_NAME_LOV,
2304                                   BYPASS_CAPA);
2305                 LASSERT(rc != 0);
2306                 goto again;
2307         } else if (rc == -ENODATA || rc == 0) {
2308                 lovea_size = lov_mds_md_size(ea_off + 1, LOV_MAGIC_V1);
2309                 /* If the declared is not big enough, re-try. */
2310                 if (buf->lb_len < lovea_size) {
2311                         rc = lovea_size;
2312                         goto again;
2313                 }
2314                 fl = LU_XATTR_CREATE;
2315         } else if (rc < 0) {
2316                 GOTO(unlock_parent, rc);
2317         } else if (unlikely(buf->lb_len == 0)) {
2318                 goto again;
2319         } else {
2320                 fl = LU_XATTR_REPLACE;
2321                 lovea_size = rc;
2322         }
2323
2324         if (fl == LU_XATTR_CREATE) {
2325                 if (bk->lb_param & LPF_DRYRUN)
2326                         GOTO(unlock_parent, rc = 1);
2327
2328                 LASSERT(buf->lb_len >= lovea_size);
2329
2330                 rc = lfsck_layout_extend_lovea(env, lfsck, handle, parent, cfid,
2331                                                buf, fl, ost_idx, ea_off, false);
2332
2333                 GOTO(unlock_parent, rc);
2334         }
2335
2336         lmm = buf->lb_buf;
2337         rc1 = lfsck_layout_verify_header(lmm);
2338
2339         /* If the LOV EA crashed, the rebuild it. */
2340         if (rc1 == -EINVAL) {
2341                 if (bk->lb_param & LPF_DRYRUN)
2342                         GOTO(unlock_parent, rc = 1);
2343
2344                 LASSERT(buf->lb_len >= lovea_size);
2345
2346                 rc = lfsck_layout_extend_lovea(env, lfsck, handle, parent, cfid,
2347                                                buf, fl, ost_idx, ea_off, true);
2348
2349                 GOTO(unlock_parent, rc);
2350         }
2351
2352         /* For other unknown magic/pattern, keep the current LOV EA. */
2353         if (rc1 != 0)
2354                 GOTO(unlock_parent, rc = rc1);
2355
2356         /* Currently, we only support LOV_MAGIC_V1/LOV_MAGIC_V3 which has
2357          * been verified in lfsck_layout_verify_header() already. If some
2358          * new magic introduced in the future, then layout LFSCK needs to
2359          * be updated also. */
2360         magic = le32_to_cpu(lmm->lmm_magic);
2361         if (magic == LOV_MAGIC_V1) {
2362                 objs = &lmm->lmm_objects[0];
2363         } else {
2364                 LASSERT(magic == LOV_MAGIC_V3);
2365                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
2366         }
2367
2368         count = le16_to_cpu(lmm->lmm_stripe_count);
2369         if (count == 0)
2370                 GOTO(unlock_parent, rc = -EINVAL);
2371         LASSERT(count > 0);
2372
2373         /* Exceed the current end of MDT-object layout EA. Then extend it. */
2374         if (count <= ea_off) {
2375                 if (bk->lb_param & LPF_DRYRUN)
2376                         GOTO(unlock_parent, rc = 1);
2377
2378                 lovea_size = lov_mds_md_size(ea_off + 1, magic);
2379                 /* If the declared is not big enough, re-try. */
2380                 if (buf->lb_len < lovea_size) {
2381                         rc = lovea_size;
2382                         goto again;
2383                 }
2384
2385                 rc = lfsck_layout_extend_lovea(env, lfsck, handle, parent, cfid,
2386                                                buf, fl, ost_idx, ea_off, false);
2387
2388                 GOTO(unlock_parent, rc);
2389         }
2390
2391         LASSERTF(rc > 0, "invalid rc = %d\n", rc);
2392
2393         for (i = 0; i < count; i++, objs++) {
2394                 /* The MDT-object was created via lfsck_layout_recover_create()
2395                  * by others before, and we fill the dummy layout EA. */
2396                 if (lovea_slot_is_dummy(objs)) {
2397                         if (i != ea_off)
2398                                 continue;
2399
2400                         if (bk->lb_param & LPF_DRYRUN)
2401                                 GOTO(unlock_parent, rc = 1);
2402
2403                         lmm->lmm_layout_gen =
2404                             cpu_to_le16(le16_to_cpu(lmm->lmm_layout_gen) + 1);
2405                         rc = lfsck_layout_refill_lovea(env, handle, parent,
2406                                                        cfid, buf, objs, fl,
2407                                                        ost_idx);
2408
2409                         CDEBUG(D_LFSCK, "%s layout LFSCK assistant fill "
2410                                "dummy layout slot for "DFID": parent "DFID
2411                                ", OST-index %u, stripe-index %u: rc = %d\n",
2412                                lfsck_lfsck2name(lfsck), PFID(cfid),
2413                                PFID(lfsck_dto2fid(parent)), ost_idx, i, rc);
2414
2415                         GOTO(unlock_parent, rc);
2416                 }
2417
2418                 ostid_le_to_cpu(&objs->l_ost_oi, oi);
2419                 rc = ostid_to_fid(fid, oi, le32_to_cpu(objs->l_ost_idx));
2420                 if (rc != 0) {
2421                         CDEBUG(D_LFSCK, "%s: the parent "DFID" contains "
2422                                "invalid layout EA at the slot %d, index %u\n",
2423                                lfsck_lfsck2name(lfsck),
2424                                PFID(lfsck_dto2fid(parent)), i,
2425                                le32_to_cpu(objs->l_ost_idx));
2426
2427                         GOTO(unlock_parent, rc);
2428                 }
2429
2430                 /* It should be rare case, the slot is there, but the LFSCK
2431                  * does not handle it during the first-phase cycle scanning. */
2432                 if (unlikely(lu_fid_eq(fid, cfid))) {
2433                         if (i == ea_off) {
2434                                 GOTO(unlock_parent, rc = 0);
2435                         } else {
2436                                 /* Rare case that the OST-object index
2437                                  * does not match the parent MDT-object
2438                                  * layout EA. We trust the later one. */
2439                                 if (bk->lb_param & LPF_DRYRUN)
2440                                         GOTO(unlock_parent, rc = 1);
2441
2442                                 dt_write_unlock(env, parent);
2443                                 if (handle != NULL)
2444                                         dt_trans_stop(env, dt, handle);
2445                                 lfsck_ibits_unlock(&lh, LCK_EX);
2446                                 rc = lfsck_layout_update_pfid(env, com, parent,
2447                                                         cfid, ltd->ltd_tgt, i);
2448
2449                                 CDEBUG(D_LFSCK, "%s layout LFSCK assistant "
2450                                        "updated OST-object's pfid for "DFID
2451                                        ": parent "DFID", OST-index %u, "
2452                                        "stripe-index %u: rc = %d\n",
2453                                        lfsck_lfsck2name(lfsck), PFID(cfid),
2454                                        PFID(lfsck_dto2fid(parent)),
2455                                        ltd->ltd_index, i, rc);
2456
2457                                 RETURN(rc);
2458                         }
2459                 }
2460         }
2461
2462         /* The MDT-object exists, but related layout EA slot is occupied
2463          * by others. */
2464         if (bk->lb_param & LPF_DRYRUN)
2465                 GOTO(unlock_parent, rc = 1);
2466
2467         dt_write_unlock(env, parent);
2468         if (handle != NULL)
2469                 dt_trans_stop(env, dt, handle);
2470         lfsck_ibits_unlock(&lh, LCK_EX);
2471         if (le32_to_cpu(lmm->lmm_magic) == LOV_MAGIC_V1)
2472                 objs = &lmm->lmm_objects[ea_off];
2473         else
2474                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[ea_off];
2475         rc = lfsck_layout_conflict_create(env, com, ltd, rec, parent, cfid,
2476                                           buf, objs, ea_off);
2477
2478         RETURN(rc);
2479
2480 unlock_parent:
2481         if (locked)
2482                 dt_write_unlock(env, parent);
2483
2484 stop:
2485         if (handle != NULL)
2486                 dt_trans_stop(env, dt, handle);
2487
2488 unlock_layout:
2489         lfsck_ibits_unlock(&lh, LCK_EX);
2490
2491         return rc;
2492 }
2493
2494 static int lfsck_layout_scan_orphan_one(const struct lu_env *env,
2495                                         struct lfsck_component *com,
2496                                         struct lfsck_tgt_desc *ltd,
2497                                         struct lu_orphan_rec *rec,
2498                                         struct lu_fid *cfid)
2499 {
2500         struct lfsck_layout     *lo     = com->lc_file_ram;
2501         struct lu_fid           *pfid   = &rec->lor_fid;
2502         struct dt_object        *parent = NULL;
2503         __u32                    ea_off = pfid->f_stripe_idx;
2504         int                      rc     = 0;
2505         ENTRY;
2506
2507         if (!fid_is_sane(cfid))
2508                 GOTO(out, rc = -EINVAL);
2509
2510         if (fid_is_zero(pfid)) {
2511                 rc = lfsck_layout_recreate_parent(env, com, ltd, rec, cfid,
2512                                                   "", "N", ea_off);
2513                 GOTO(out, rc);
2514         }
2515
2516         pfid->f_ver = 0;
2517         if (!fid_is_sane(pfid))
2518                 GOTO(out, rc = -EINVAL);
2519
2520         parent = lfsck_object_find_by_dev(env, com->lc_lfsck->li_bottom, pfid);
2521         if (IS_ERR(parent))
2522                 GOTO(out, rc = PTR_ERR(parent));
2523
2524         if (unlikely(dt_object_remote(parent) != 0))
2525                 GOTO(put, rc = -EXDEV);
2526
2527         if (dt_object_exists(parent) == 0) {
2528                 lu_object_put(env, &parent->do_lu);
2529                 rc = lfsck_layout_recreate_parent(env, com, ltd, rec, cfid,
2530                                                   "", "R", ea_off);
2531                 GOTO(out, rc);
2532         }
2533
2534         if (!S_ISREG(lu_object_attr(&parent->do_lu)))
2535                 GOTO(put, rc = -EISDIR);
2536
2537         rc = lfsck_layout_recreate_lovea(env, com, ltd, rec, parent, cfid,
2538                                          ltd->ltd_index, ea_off);
2539
2540         GOTO(put, rc);
2541
2542 put:
2543         if (rc <= 0)
2544                 lu_object_put(env, &parent->do_lu);
2545         else
2546                 /* The layout EA is changed, need to be reloaded next time. */
2547                 lu_object_put_nocache(env, &parent->do_lu);
2548
2549 out:
2550         down_write(&com->lc_sem);
2551         com->lc_new_scanned++;
2552         com->lc_new_checked++;
2553         if (rc > 0) {
2554                 lo->ll_objs_repaired[LLIT_ORPHAN - 1]++;
2555                 rc = 0;
2556         } else if (rc < 0) {
2557                 lo->ll_objs_failed_phase2++;
2558         }
2559         up_write(&com->lc_sem);
2560
2561         return rc;
2562 }
2563
2564 static int lfsck_layout_scan_orphan(const struct lu_env *env,
2565                                     struct lfsck_component *com,
2566                                     struct lfsck_tgt_desc *ltd)
2567 {
2568         struct lfsck_assistant_data     *lad    = com->lc_data;
2569         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2570         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
2571         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2572         struct ost_id                   *oi     = &info->lti_oi;
2573         struct lu_fid                   *fid    = &info->lti_fid;
2574         struct dt_object                *obj;
2575         const struct dt_it_ops          *iops;
2576         struct dt_it                    *di;
2577         int                              rc     = 0;
2578         ENTRY;
2579
2580         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant starts the orphan "
2581                "scanning for OST%04x\n",
2582                lfsck_lfsck2name(lfsck), ltd->ltd_index);
2583
2584         if (cfs_bitmap_check(lad->lad_bitmap, ltd->ltd_index)) {
2585                 CDEBUG(D_LFSCK, "%s: layout LFSCK assistant skip the orphan "
2586                        "scanning for OST%04x\n",
2587                        lfsck_lfsck2name(lfsck), ltd->ltd_index);
2588
2589                 RETURN(0);
2590         }
2591
2592         ostid_set_seq(oi, FID_SEQ_IDIF);
2593         ostid_set_id(oi, 0);
2594         rc = ostid_to_fid(fid, oi, ltd->ltd_index);
2595         if (rc != 0)
2596                 GOTO(log, rc);
2597
2598         obj = lfsck_object_find_by_dev(env, ltd->ltd_tgt, fid);
2599         if (unlikely(IS_ERR(obj)))
2600                 GOTO(log, rc = PTR_ERR(obj));
2601
2602         rc = obj->do_ops->do_index_try(env, obj, &dt_lfsck_orphan_features);
2603         if (rc != 0)
2604                 GOTO(put, rc);
2605
2606         iops = &obj->do_index_ops->dio_it;
2607         di = iops->init(env, obj, 0, BYPASS_CAPA);
2608         if (IS_ERR(di))
2609                 GOTO(put, rc = PTR_ERR(di));
2610
2611         rc = iops->load(env, di, 0);
2612         if (rc == -ESRCH) {
2613                 /* -ESRCH means that the orphan OST-objects rbtree has been
2614                  * cleanup because of the OSS server restart or other errors. */
2615                 lfsck_lad_set_bitmap(env, com, ltd->ltd_index);
2616                 GOTO(fini, rc);
2617         }
2618
2619         if (rc == 0)
2620                 rc = iops->next(env, di);
2621         else if (rc > 0)
2622                 rc = 0;
2623
2624         if (rc < 0)
2625                 GOTO(fini, rc);
2626
2627         if (rc > 0)
2628                 GOTO(fini, rc = 0);
2629
2630         do {
2631                 struct dt_key           *key;
2632                 struct lu_orphan_rec    *rec = &info->lti_rec;
2633
2634                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY3, cfs_fail_val) &&
2635                     unlikely(!thread_is_running(&lfsck->li_thread)))
2636                         break;
2637
2638                 key = iops->key(env, di);
2639                 com->lc_fid_latest_scanned_phase2 = *(struct lu_fid *)key;
2640                 rc = iops->rec(env, di, (struct dt_rec *)rec, 0);
2641                 if (rc == 0)
2642                         rc = lfsck_layout_scan_orphan_one(env, com, ltd, rec,
2643                                         &com->lc_fid_latest_scanned_phase2);
2644                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
2645                         GOTO(fini, rc);
2646
2647                 lfsck_control_speed_by_self(com);
2648                 do {
2649                         rc = iops->next(env, di);
2650                 } while (rc < 0 && !(bk->lb_param & LPF_FAILOUT));
2651         } while (rc == 0);
2652
2653         GOTO(fini, rc);
2654
2655 fini:
2656         iops->put(env, di);
2657         iops->fini(env, di);
2658 put:
2659         lu_object_put(env, &obj->do_lu);
2660
2661 log:
2662         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant finished the orphan "
2663                "scanning for OST%04x: rc = %d\n",
2664                lfsck_lfsck2name(lfsck), ltd->ltd_index, rc);
2665
2666         return rc > 0 ? 0 : rc;
2667 }
2668
2669 /* For the MDT-object with dangling reference, we need to repare the
2670  * inconsistency according to the LFSCK sponsor's requirement:
2671  *
2672  * 1) Keep the inconsistency there and report the inconsistency case,
2673  *    then give the chance to the application to find related issues,
2674  *    and the users can make the decision about how to handle it with
2675  *    more human knownledge. (by default)
2676  *
2677  * 2) Re-create the missing OST-object with the FID/owner information. */
2678 static int lfsck_layout_repair_dangling(const struct lu_env *env,
2679                                         struct lfsck_component *com,
2680                                         struct lfsck_layout_req *llr,
2681                                         const struct lu_attr *pla)
2682 {
2683         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2684         struct filter_fid               *pfid   = &info->lti_new_pfid;
2685         struct dt_allocation_hint       *hint   = &info->lti_hint;
2686         struct lu_attr                  *cla    = &info->lti_la2;
2687         struct dt_object                *parent = llr->llr_parent->llo_obj;
2688         struct dt_object                *child  = llr->llr_child;
2689         struct dt_device                *dev    = lfsck_obj2dt_dev(child);
2690         const struct lu_fid             *tfid   = lu_object_fid(&parent->do_lu);
2691         struct thandle                  *handle;
2692         struct lu_buf                   *buf;
2693         struct lustre_handle             lh     = { 0 };
2694         int                              rc;
2695         bool                             create;
2696         ENTRY;
2697
2698         if (com->lc_lfsck->li_bookmark_ram.lb_param & LPF_CREATE_OSTOBJ)
2699                 create = true;
2700         else
2701                 create = false;
2702
2703         if (!create)
2704                 GOTO(log, rc = 1);
2705
2706         memset(cla, 0, sizeof(*cla));
2707         cla->la_uid = pla->la_uid;
2708         cla->la_gid = pla->la_gid;
2709         cla->la_mode = S_IFREG | 0666;
2710         cla->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
2711                         LA_ATIME | LA_MTIME | LA_CTIME;
2712
2713         rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
2714                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2715                               LCK_EX);
2716         if (rc != 0)
2717                 GOTO(log, rc);
2718
2719         handle = dt_trans_create(env, dev);
2720         if (IS_ERR(handle))
2721                 GOTO(unlock1, rc = PTR_ERR(handle));
2722
2723         hint->dah_parent = NULL;
2724         hint->dah_mode = 0;
2725         pfid->ff_parent.f_seq = cpu_to_le64(tfid->f_seq);
2726         pfid->ff_parent.f_oid = cpu_to_le32(tfid->f_oid);
2727         /* Currently, the filter_fid::ff_parent::f_ver is not the real parent
2728          * MDT-object's FID::f_ver, instead it is the OST-object index in its
2729          * parent MDT-object's layout EA. */
2730         pfid->ff_parent.f_stripe_idx = cpu_to_le32(llr->llr_lov_idx);
2731         buf = lfsck_buf_get(env, pfid, sizeof(struct filter_fid));
2732
2733         rc = dt_declare_create(env, child, cla, hint, NULL, handle);
2734         if (rc != 0)
2735                 GOTO(stop, rc);
2736
2737         rc = dt_declare_xattr_set(env, child, buf, XATTR_NAME_FID,
2738                                   LU_XATTR_CREATE, handle);
2739         if (rc != 0)
2740                 GOTO(stop, rc);
2741
2742         rc = dt_trans_start(env, dev, handle);
2743         if (rc != 0)
2744                 GOTO(stop, rc);
2745
2746         dt_read_lock(env, parent, 0);
2747         if (unlikely(lfsck_is_dead_obj(parent)))
2748                 GOTO(unlock2, rc = 1);
2749
2750         rc = dt_create(env, child, cla, hint, NULL, handle);
2751         if (rc != 0)
2752                 GOTO(unlock2, rc);
2753
2754         rc = dt_xattr_set(env, child, buf, XATTR_NAME_FID, LU_XATTR_CREATE,
2755                           handle, BYPASS_CAPA);
2756
2757         GOTO(unlock2, rc);
2758
2759 unlock2:
2760         dt_read_unlock(env, parent);
2761
2762 stop:
2763         rc = lfsck_layout_trans_stop(env, dev, handle, rc);
2764
2765 unlock1:
2766         lfsck_ibits_unlock(&lh, LCK_EX);
2767
2768 log:
2769         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant found dangling "
2770                "reference for: parent "DFID", child "DFID", OST-index %u, "
2771                "stripe-index %u, owner %u/%u. %s: rc = %d\n",
2772                lfsck_lfsck2name(com->lc_lfsck), PFID(lfsck_dto2fid(parent)),
2773                PFID(lfsck_dto2fid(child)), llr->llr_ost_idx,
2774                llr->llr_lov_idx, pla->la_uid, pla->la_gid,
2775                create ? "Create the lost OST-object as required" :
2776                         "Keep the MDT-object there by default", rc);
2777
2778         return rc;
2779 }
2780
2781 /* If the OST-object does not recognize the MDT-object as its parent, and
2782  * there is no other MDT-object claims as its parent, then just trust the
2783  * given MDT-object as its parent. So update the OST-object filter_fid. */
2784 static int lfsck_layout_repair_unmatched_pair(const struct lu_env *env,
2785                                               struct lfsck_component *com,
2786                                               struct lfsck_layout_req *llr,
2787                                               const struct lu_attr *pla)
2788 {
2789         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2790         struct filter_fid               *pfid   = &info->lti_new_pfid;
2791         struct lu_attr                  *tla    = &info->lti_la3;
2792         struct dt_object                *parent = llr->llr_parent->llo_obj;
2793         struct dt_object                *child  = llr->llr_child;
2794         struct dt_device                *dev    = lfsck_obj2dt_dev(child);
2795         const struct lu_fid             *tfid   = lu_object_fid(&parent->do_lu);
2796         struct thandle                  *handle;
2797         struct lu_buf                   *buf;
2798         struct lustre_handle             lh     = { 0 };
2799         int                              rc;
2800         ENTRY;
2801
2802         rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
2803                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2804                               LCK_EX);
2805         if (rc != 0)
2806                 GOTO(log, rc);
2807
2808         handle = dt_trans_create(env, dev);
2809         if (IS_ERR(handle))
2810                 GOTO(unlock1, rc = PTR_ERR(handle));
2811
2812         pfid->ff_parent.f_seq = cpu_to_le64(tfid->f_seq);
2813         pfid->ff_parent.f_oid = cpu_to_le32(tfid->f_oid);
2814         /* Currently, the filter_fid::ff_parent::f_ver is not the real parent
2815          * MDT-object's FID::f_ver, instead it is the OST-object index in its
2816          * parent MDT-object's layout EA. */
2817         pfid->ff_parent.f_stripe_idx = cpu_to_le32(llr->llr_lov_idx);
2818         buf = lfsck_buf_get(env, pfid, sizeof(struct filter_fid));
2819
2820         rc = dt_declare_xattr_set(env, child, buf, XATTR_NAME_FID, 0, handle);
2821         if (rc != 0)
2822                 GOTO(stop, rc);
2823
2824         tla->la_valid = LA_UID | LA_GID;
2825         tla->la_uid = pla->la_uid;
2826         tla->la_gid = pla->la_gid;
2827         rc = dt_declare_attr_set(env, child, tla, handle);
2828         if (rc != 0)
2829                 GOTO(stop, rc);
2830
2831         rc = dt_trans_start(env, dev, handle);
2832         if (rc != 0)
2833                 GOTO(stop, rc);
2834
2835         dt_write_lock(env, parent, 0);
2836         if (unlikely(lfsck_is_dead_obj(parent)))
2837                 GOTO(unlock2, rc = 1);
2838
2839         rc = dt_xattr_set(env, child, buf, XATTR_NAME_FID, 0, handle,
2840                           BYPASS_CAPA);
2841         if (rc != 0)
2842                 GOTO(unlock2, rc);
2843
2844         /* Get the latest parent's owner. */
2845         rc = dt_attr_get(env, parent, tla, BYPASS_CAPA);
2846         if (rc != 0)
2847                 GOTO(unlock2, rc);
2848
2849         tla->la_valid = LA_UID | LA_GID;
2850         rc = dt_attr_set(env, child, tla, handle, BYPASS_CAPA);
2851
2852         GOTO(unlock2, rc);
2853
2854 unlock2:
2855         dt_write_unlock(env, parent);
2856
2857 stop:
2858         rc = lfsck_layout_trans_stop(env, dev, handle, rc);
2859
2860 unlock1:
2861         lfsck_ibits_unlock(&lh, LCK_EX);
2862
2863 log:
2864         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant repaired unmatched "
2865                "MDT-OST pair for: parent "DFID", child "DFID", OST-index %u, "
2866                "stripe-index %u, owner %u/%u: rc = %d\n",
2867                lfsck_lfsck2name(com->lc_lfsck), PFID(lfsck_dto2fid(parent)),
2868                PFID(lfsck_dto2fid(child)), llr->llr_ost_idx, llr->llr_lov_idx,
2869                pla->la_uid, pla->la_gid, rc);
2870
2871         return rc;
2872 }
2873
2874 /* If there are more than one MDT-objects claim as the OST-object's parent,
2875  * and the OST-object only recognizes one of them, then we need to generate
2876  * new OST-object(s) with new fid(s) for the non-recognized MDT-object(s). */
2877 static int lfsck_layout_repair_multiple_references(const struct lu_env *env,
2878                                                    struct lfsck_component *com,
2879                                                    struct lfsck_layout_req *llr,
2880                                                    struct lu_attr *la,
2881                                                    struct lu_buf *buf)
2882 {
2883         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2884         struct dt_allocation_hint       *hint   = &info->lti_hint;
2885         struct dt_object_format         *dof    = &info->lti_dof;
2886         struct dt_device                *pdev   = com->lc_lfsck->li_next;
2887         struct ost_id                   *oi     = &info->lti_oi;
2888         struct dt_object                *parent = llr->llr_parent->llo_obj;
2889         struct dt_device                *cdev   = lfsck_obj2dt_dev(llr->llr_child);
2890         struct dt_object                *child  = NULL;
2891         struct lu_device                *d      = &cdev->dd_lu_dev;
2892         struct lu_object                *o      = NULL;
2893         struct thandle                  *handle;
2894         struct lov_mds_md_v1            *lmm;
2895         struct lov_ost_data_v1          *objs;
2896         struct lustre_handle             lh     = { 0 };
2897         struct lu_buf                    ea_buf;
2898         __u32                            magic;
2899         int                              rc;
2900         ENTRY;
2901
2902         rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
2903                               MDS_INODELOCK_LAYOUT | MDS_INODELOCK_XATTR,
2904                               LCK_EX);
2905         if (rc != 0)
2906                 GOTO(log, rc);
2907
2908         handle = dt_trans_create(env, pdev);
2909         if (IS_ERR(handle))
2910                 GOTO(unlock1, rc = PTR_ERR(handle));
2911
2912         o = lu_object_anon(env, d, NULL);
2913         if (IS_ERR(o))
2914                 GOTO(stop, rc = PTR_ERR(o));
2915
2916         child = container_of(o, struct dt_object, do_lu);
2917         o = lu_object_locate(o->lo_header, d->ld_type);
2918         if (unlikely(o == NULL))
2919                 GOTO(stop, rc = -EINVAL);
2920
2921         child = container_of(o, struct dt_object, do_lu);
2922         la->la_valid = LA_UID | LA_GID;
2923         hint->dah_parent = NULL;
2924         hint->dah_mode = 0;
2925         dof->dof_type = DFT_REGULAR;
2926         rc = dt_declare_create(env, child, la, NULL, NULL, handle);
2927         if (rc != 0)
2928                 GOTO(stop, rc);
2929
2930         rc = dt_declare_xattr_set(env, parent, buf, XATTR_NAME_LOV,
2931                                   LU_XATTR_REPLACE, handle);
2932         if (rc != 0)
2933                 GOTO(stop, rc);
2934
2935         rc = dt_trans_start(env, pdev, handle);
2936         if (rc != 0)
2937                 GOTO(stop, rc);
2938
2939         dt_write_lock(env, parent, 0);
2940         if (unlikely(lfsck_is_dead_obj(parent)))
2941                 GOTO(unlock2, rc = 0);
2942
2943         rc = dt_xattr_get(env, parent, buf, XATTR_NAME_LOV, BYPASS_CAPA);
2944         if (unlikely(rc == 0 || rc == -ENODATA || rc == -ERANGE))
2945                 GOTO(unlock2, rc = 0);
2946
2947         lmm = buf->lb_buf;
2948         /* Someone change layout during the LFSCK, no need to repair then. */
2949         if (le16_to_cpu(lmm->lmm_layout_gen) != llr->llr_parent->llo_gen)
2950                 GOTO(unlock2, rc = 0);
2951
2952         rc = dt_create(env, child, la, hint, dof, handle);
2953         if (rc != 0)
2954                 GOTO(unlock2, rc);
2955
2956         /* Currently, we only support LOV_MAGIC_V1/LOV_MAGIC_V3 which has
2957          * been verified in lfsck_layout_verify_header() already. If some
2958          * new magic introduced in the future, then layout LFSCK needs to
2959          * be updated also. */
2960         magic = le32_to_cpu(lmm->lmm_magic);
2961         if (magic == LOV_MAGIC_V1) {
2962                 objs = &lmm->lmm_objects[0];
2963         } else {
2964                 LASSERT(magic == LOV_MAGIC_V3);
2965                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
2966         }
2967
2968         lmm->lmm_layout_gen = cpu_to_le16(llr->llr_parent->llo_gen + 1);
2969         fid_to_ostid(lu_object_fid(&child->do_lu), oi);
2970         ostid_cpu_to_le(oi, &objs[llr->llr_lov_idx].l_ost_oi);
2971         objs[llr->llr_lov_idx].l_ost_gen = cpu_to_le32(0);
2972         objs[llr->llr_lov_idx].l_ost_idx = cpu_to_le32(llr->llr_ost_idx);
2973         lfsck_buf_init(&ea_buf, lmm,
2974                        lov_mds_md_size(le16_to_cpu(lmm->lmm_stripe_count),
2975                                        magic));
2976         rc = dt_xattr_set(env, parent, &ea_buf, XATTR_NAME_LOV,
2977                           LU_XATTR_REPLACE, handle, BYPASS_CAPA);
2978
2979         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
2980
2981 unlock2:
2982         dt_write_unlock(env, parent);
2983
2984 stop:
2985         if (child != NULL)
2986                 lu_object_put(env, &child->do_lu);
2987
2988         dt_trans_stop(env, pdev, handle);
2989
2990 unlock1:
2991         lfsck_ibits_unlock(&lh, LCK_EX);
2992
2993 log:
2994         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant repaired multiple "
2995                "references for: parent "DFID", OST-index %u, stripe-index %u, "
2996                "owner %u/%u: rc = %d\n",
2997                lfsck_lfsck2name(com->lc_lfsck), PFID(lfsck_dto2fid(parent)),
2998                llr->llr_ost_idx, llr->llr_lov_idx, la->la_uid, la->la_gid, rc);
2999
3000         return rc;
3001 }
3002
3003 /* If the MDT-object and the OST-object have different owner information,
3004  * then trust the MDT-object, because the normal chown/chgrp handle order
3005  * is from MDT to OST, and it is possible that some chown/chgrp operation
3006  * is partly done. */
3007 static int lfsck_layout_repair_owner(const struct lu_env *env,
3008                                      struct lfsck_component *com,
3009                                      struct lfsck_layout_req *llr,
3010                                      struct lu_attr *pla)
3011 {
3012         struct lfsck_thread_info        *info   = lfsck_env_info(env);
3013         struct lu_attr                  *tla    = &info->lti_la3;
3014         struct dt_object                *parent = llr->llr_parent->llo_obj;
3015         struct dt_object                *child  = llr->llr_child;
3016         struct dt_device                *dev    = lfsck_obj2dt_dev(child);
3017         struct thandle                  *handle;
3018         int                              rc;
3019         ENTRY;
3020
3021         handle = dt_trans_create(env, dev);
3022         if (IS_ERR(handle))
3023                 GOTO(log, rc = PTR_ERR(handle));
3024
3025         tla->la_uid = pla->la_uid;
3026         tla->la_gid = pla->la_gid;
3027         tla->la_valid = LA_UID | LA_GID;
3028         rc = dt_declare_attr_set(env, child, tla, handle);
3029         if (rc != 0)
3030                 GOTO(stop, rc);
3031
3032         rc = dt_trans_start(env, dev, handle);
3033         if (rc != 0)
3034                 GOTO(stop, rc);
3035
3036         /* Use the dt_object lock to serialize with destroy and attr_set. */
3037         dt_read_lock(env, parent, 0);
3038         if (unlikely(lfsck_is_dead_obj(parent)))
3039                 GOTO(unlock, rc = 1);
3040
3041         /* Get the latest parent's owner. */
3042         rc = dt_attr_get(env, parent, tla, BYPASS_CAPA);
3043         if (rc != 0)
3044                 GOTO(unlock, rc);
3045
3046         /* Some others chown/chgrp during the LFSCK, needs to do nothing. */
3047         if (unlikely(tla->la_uid != pla->la_uid ||
3048                      tla->la_gid != pla->la_gid))
3049                 GOTO(unlock, rc = 1);
3050
3051         tla->la_valid = LA_UID | LA_GID;
3052         rc = dt_attr_set(env, child, tla, handle, BYPASS_CAPA);
3053
3054         GOTO(unlock, rc);
3055
3056 unlock:
3057         dt_read_unlock(env, parent);
3058
3059 stop:
3060         rc = lfsck_layout_trans_stop(env, dev, handle, rc);
3061
3062 log:
3063         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant repaired inconsistent "
3064                "file owner for: parent "DFID", child "DFID", OST-index %u, "
3065                "stripe-index %u, owner %u/%u: rc = %d\n",
3066                lfsck_lfsck2name(com->lc_lfsck), PFID(lfsck_dto2fid(parent)),
3067                PFID(lfsck_dto2fid(child)), llr->llr_ost_idx, llr->llr_lov_idx,
3068                pla->la_uid, pla->la_gid, rc);
3069
3070         return rc;
3071 }
3072
3073 /* Check whether the OST-object correctly back points to the
3074  * MDT-object (@parent) via the XATTR_NAME_FID xattr (@pfid). */
3075 static int lfsck_layout_check_parent(const struct lu_env *env,
3076                                      struct lfsck_component *com,
3077                                      struct dt_object *parent,
3078                                      const struct lu_fid *pfid,
3079                                      const struct lu_fid *cfid,
3080                                      const struct lu_attr *pla,
3081                                      const struct lu_attr *cla,
3082                                      struct lfsck_layout_req *llr,
3083                                      struct lu_buf *lov_ea, __u32 idx)
3084 {
3085         struct lfsck_thread_info        *info   = lfsck_env_info(env);
3086         struct lu_buf                   *buf    = &info->lti_big_buf;
3087         struct dt_object                *tobj;
3088         struct lov_mds_md_v1            *lmm;
3089         struct lov_ost_data_v1          *objs;
3090         struct lustre_handle             lh     = { 0 };
3091         int                              rc;
3092         int                              i;
3093         __u32                            magic;
3094         __u16                            count;
3095         ENTRY;
3096
3097         if (fid_is_zero(pfid)) {
3098                 /* client never wrote. */
3099                 if (cla->la_size == 0 && cla->la_blocks == 0) {
3100                         if (unlikely(cla->la_uid != pla->la_uid ||
3101                                      cla->la_gid != pla->la_gid))
3102                                 RETURN (LLIT_INCONSISTENT_OWNER);
3103
3104                         RETURN(0);
3105                 }
3106
3107                 RETURN(LLIT_UNMATCHED_PAIR);
3108         }
3109
3110         if (unlikely(!fid_is_sane(pfid)))
3111                 RETURN(LLIT_UNMATCHED_PAIR);
3112
3113         if (lu_fid_eq(pfid, lu_object_fid(&parent->do_lu))) {
3114                 if (llr->llr_lov_idx == idx)
3115                         RETURN(0);
3116
3117                 RETURN(LLIT_UNMATCHED_PAIR);
3118         }
3119
3120         tobj = lfsck_object_find(env, com->lc_lfsck, pfid);
3121         if (IS_ERR(tobj))
3122                 RETURN(PTR_ERR(tobj));
3123
3124         if (dt_object_exists(tobj) == 0 ||
3125             lfsck_is_dead_obj(tobj))
3126                 GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3127
3128         if (!S_ISREG(lfsck_object_type(tobj)))
3129                 GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3130
3131         /* Load the tobj's layout EA, in spite of it is a local MDT-object or
3132          * remote one on another MDT. Then check whether the given OST-object
3133          * is in such layout. If yes, it is multiple referenced, otherwise it
3134          * is unmatched referenced case. */
3135         rc = lfsck_layout_get_lovea(env, tobj, buf);
3136         if (rc == 0 || rc == -ENOENT)
3137                 GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3138
3139         if (rc < 0)
3140                 GOTO(out, rc);
3141
3142         lmm = buf->lb_buf;
3143         magic = le32_to_cpu(lmm->lmm_magic);
3144         if (magic == LOV_MAGIC_V1) {
3145                 objs = &lmm->lmm_objects[0];
3146         } else {
3147                 LASSERT(magic == LOV_MAGIC_V3);
3148                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
3149         }
3150
3151         count = le16_to_cpu(lmm->lmm_stripe_count);
3152         for (i = 0; i < count; i++, objs++) {
3153                 struct lu_fid           *tfid   = &info->lti_fid2;
3154                 struct ost_id           *oi     = &info->lti_oi;
3155                 __u32                    idx2;
3156
3157                 if (lovea_slot_is_dummy(objs))
3158                         continue;
3159
3160                 ostid_le_to_cpu(&objs->l_ost_oi, oi);
3161                 idx2 = le32_to_cpu(objs->l_ost_idx);
3162                 rc = ostid_to_fid(tfid, oi, idx2);
3163                 if (rc != 0) {
3164                         CDEBUG(D_LFSCK, "%s: the parent "DFID" contains "
3165                                "invalid layout EA at the slot %d, index %u\n",
3166                                lfsck_lfsck2name(com->lc_lfsck),
3167                                PFID(pfid), i, idx2);
3168
3169                         GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3170                 }
3171
3172                 if (lu_fid_eq(cfid, tfid)) {
3173                         rc = lfsck_ibits_lock(env, com->lc_lfsck, tobj, &lh,
3174                                               MDS_INODELOCK_UPDATE |
3175                                               MDS_INODELOCK_LAYOUT |
3176                                               MDS_INODELOCK_XATTR,
3177                                               LCK_EX);
3178                         if (rc != 0)
3179                                 GOTO(out, rc);
3180
3181                         dt_read_lock(env, tobj, 0);
3182
3183                         /* For local MDT-object, re-check existence
3184                          * after taken the lock. */
3185                         if (!dt_object_remote(tobj)) {
3186                                 if (dt_object_exists(tobj) == 0 ||
3187                                     lfsck_is_dead_obj(tobj)) {
3188                                         rc = LLIT_UNMATCHED_PAIR;
3189                                 } else {
3190                                         *lov_ea = *buf;
3191                                         rc = LLIT_MULTIPLE_REFERENCED;
3192                                 }
3193
3194                                 GOTO(unlock, rc);
3195                         }
3196
3197                         /* For migration case, the new MDT-object and old
3198                          * MDT-object may reference the same OST-object at
3199                          * some migration internal time.
3200                          *
3201                          * For remote MDT-object, the local MDT may not know
3202                          * whether it has been removed or not.  Try checking
3203                          * for a non-existent xattr to check if this object
3204                          * has been been removed or not. */
3205                         rc = dt_xattr_get(env, tobj, &LU_BUF_NULL,
3206                                           XATTR_NAME_DUMMY, BYPASS_CAPA);
3207                         if (unlikely(rc == -ENOENT || rc >= 0)) {
3208                                 rc = LLIT_UNMATCHED_PAIR;
3209                         } else if (rc == -ENODATA) {
3210                                 *lov_ea = *buf;
3211                                 rc = LLIT_MULTIPLE_REFERENCED;
3212                         }
3213
3214                         GOTO(unlock, rc);
3215                 }
3216         }
3217
3218         GOTO(out, rc = LLIT_UNMATCHED_PAIR);
3219
3220 unlock:
3221         if (lustre_handle_is_used(&lh)) {
3222                 dt_read_unlock(env, tobj);
3223                 lfsck_ibits_unlock(&lh, LCK_EX);
3224         }
3225
3226 out:
3227         lfsck_object_put(env, tobj);
3228
3229         return rc;
3230 }
3231
3232 static int lfsck_layout_assistant_handler_p1(const struct lu_env *env,
3233                                              struct lfsck_component *com,
3234                                              struct lfsck_assistant_req *lar)
3235 {
3236         struct lfsck_layout_req              *llr    =
3237                         container_of0(lar, struct lfsck_layout_req, llr_lar);
3238         struct lfsck_layout                  *lo     = com->lc_file_ram;
3239         struct lfsck_thread_info             *info   = lfsck_env_info(env);
3240         struct filter_fid_old                *pea    = &info->lti_old_pfid;
3241         struct lu_fid                        *pfid   = &info->lti_fid;
3242         struct lu_buf                         buf    = { NULL };
3243         struct dt_object                     *parent = llr->llr_parent->llo_obj;
3244         struct dt_object                     *child  = llr->llr_child;
3245         struct lu_attr                       *pla    = &info->lti_la;
3246         struct lu_attr                       *cla    = &info->lti_la2;
3247         struct lfsck_instance                *lfsck  = com->lc_lfsck;
3248         struct lfsck_bookmark                *bk     = &lfsck->li_bookmark_ram;
3249         enum lfsck_layout_inconsistency_type  type   = LLIT_NONE;
3250         __u32                                 idx    = 0;
3251         int                                   rc;
3252         ENTRY;
3253
3254         if (unlikely(lfsck_is_dead_obj(parent)))
3255                 RETURN(0);
3256
3257         rc = dt_attr_get(env, parent, pla, BYPASS_CAPA);
3258         if (rc != 0)
3259                 GOTO(out, rc);
3260
3261         rc = dt_attr_get(env, child, cla, BYPASS_CAPA);
3262         if (rc == -ENOENT) {
3263                 if (unlikely(lfsck_is_dead_obj(parent)))
3264                         RETURN(0);
3265
3266                 type = LLIT_DANGLING;
3267                 goto repair;
3268         }
3269
3270         if (rc != 0)
3271                 GOTO(out, rc);
3272
3273         lfsck_buf_init(&buf, pea, sizeof(struct filter_fid_old));
3274         rc = dt_xattr_get(env, child, &buf, XATTR_NAME_FID, BYPASS_CAPA);
3275         if (unlikely(rc >= 0 && rc != sizeof(struct filter_fid_old) &&
3276                      rc != sizeof(struct filter_fid))) {
3277                 type = LLIT_UNMATCHED_PAIR;
3278                 goto repair;
3279         }
3280
3281         if (rc < 0 && rc != -ENODATA)
3282                 GOTO(out, rc);
3283
3284         if (rc == -ENODATA) {
3285                 fid_zero(pfid);
3286         } else {
3287                 fid_le_to_cpu(pfid, &pea->ff_parent);
3288                 /* Currently, the filter_fid::ff_parent::f_ver is not the
3289                  * real parent MDT-object's FID::f_ver, instead it is the
3290                  * OST-object index in its parent MDT-object's layout EA. */
3291                 idx = pfid->f_stripe_idx;
3292                 pfid->f_ver = 0;
3293         }
3294
3295         rc = lfsck_layout_check_parent(env, com, parent, pfid,
3296                                        lu_object_fid(&child->do_lu),
3297                                        pla, cla, llr, &buf, idx);
3298         if (rc > 0) {
3299                 type = rc;
3300                 goto repair;
3301         }
3302
3303         if (rc < 0)
3304                 GOTO(out, rc);
3305
3306         if (unlikely(cla->la_uid != pla->la_uid ||
3307                      cla->la_gid != pla->la_gid)) {
3308                 type = LLIT_INCONSISTENT_OWNER;
3309                 goto repair;
3310         }
3311
3312 repair:
3313         if (bk->lb_param & LPF_DRYRUN) {
3314                 if (type != LLIT_NONE)
3315                         GOTO(out, rc = 1);
3316                 else
3317                         GOTO(out, rc = 0);
3318         }
3319
3320         switch (type) {
3321         case LLIT_DANGLING:
3322                 rc = lfsck_layout_repair_dangling(env, com, llr, pla);
3323                 break;
3324         case LLIT_UNMATCHED_PAIR:
3325                 rc = lfsck_layout_repair_unmatched_pair(env, com, llr, pla);
3326                 break;
3327         case LLIT_MULTIPLE_REFERENCED:
3328                 rc = lfsck_layout_repair_multiple_references(env, com, llr,
3329                                                              pla, &buf);
3330                 break;
3331         case LLIT_INCONSISTENT_OWNER:
3332                 rc = lfsck_layout_repair_owner(env, com, llr, pla);
3333                 break;
3334         default:
3335                 rc = 0;
3336                 break;
3337         }
3338
3339         GOTO(out, rc);
3340
3341 out:
3342         down_write(&com->lc_sem);
3343         if (rc < 0) {
3344                 struct lfsck_assistant_data *lad = com->lc_data;
3345
3346                 if (unlikely(lad->lad_exit)) {
3347                         rc = 0;
3348                 } else if (rc == -ENOTCONN || rc == -ESHUTDOWN ||
3349                            rc == -ETIMEDOUT || rc == -EHOSTDOWN ||
3350                            rc == -EHOSTUNREACH) {
3351                         /* If cannot touch the target server,
3352                          * mark the LFSCK as INCOMPLETE. */
3353                         CDEBUG(D_LFSCK, "%s: layout LFSCK assistant fail to "
3354                                "talk with OST %x: rc = %d\n",
3355                                lfsck_lfsck2name(lfsck), llr->llr_ost_idx, rc);
3356                         lfsck_lad_set_bitmap(env, com, llr->llr_ost_idx);
3357                         lo->ll_objs_skipped++;
3358                         rc = 0;
3359                 } else {
3360                         lfsck_layout_record_failure(env, lfsck, lo);
3361                 }
3362         } else if (rc > 0) {
3363                 LASSERTF(type > LLIT_NONE && type <= LLIT_MAX,
3364                          "unknown type = %d\n", type);
3365
3366                 lo->ll_objs_repaired[type - 1]++;
3367                 if (bk->lb_param & LPF_DRYRUN &&
3368                     unlikely(lo->ll_pos_first_inconsistent == 0))
3369                         lo->ll_pos_first_inconsistent =
3370                         lfsck->li_obj_oit->do_index_ops->dio_it.store(env,
3371                                                         lfsck->li_di_oit);
3372         }
3373         up_write(&com->lc_sem);
3374
3375         return rc;
3376 }
3377
3378 static int lfsck_layout_assistant_handler_p2(const struct lu_env *env,
3379                                              struct lfsck_component *com)
3380 {
3381         struct lfsck_assistant_data     *lad    = com->lc_data;
3382         struct lfsck_instance           *lfsck  = com->lc_lfsck;
3383         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
3384         struct lfsck_tgt_descs          *ltds   = &lfsck->li_ost_descs;
3385         struct lfsck_tgt_desc           *ltd;
3386         int                              rc     = 0;
3387         ENTRY;
3388
3389         CDEBUG(D_LFSCK, "%s: layout LFSCK phase2 scan start\n",
3390                lfsck_lfsck2name(lfsck));
3391
3392         spin_lock(&ltds->ltd_lock);
3393         while (!list_empty(&lad->lad_ost_phase2_list)) {
3394                 ltd = list_entry(lad->lad_ost_phase2_list.next,
3395                                  struct lfsck_tgt_desc,
3396                                  ltd_layout_phase_list);
3397                 list_del_init(&ltd->ltd_layout_phase_list);
3398                 if (bk->lb_param & LPF_ALL_TGT) {
3399                         spin_unlock(&ltds->ltd_lock);
3400                         rc = lfsck_layout_scan_orphan(env, com, ltd);
3401                         if (rc != 0 && bk->lb_param & LPF_FAILOUT)
3402                                 RETURN(rc);
3403
3404                         if (unlikely(lad->lad_exit ||
3405                                      !thread_is_running(&lfsck->li_thread)))
3406                                 RETURN(0);
3407                         spin_lock(&ltds->ltd_lock);
3408                 }
3409         }
3410
3411         if (list_empty(&lad->lad_ost_phase1_list))
3412                 rc = 1;
3413         else
3414                 rc = 0;
3415         spin_unlock(&ltds->ltd_lock);
3416
3417         CDEBUG(D_LFSCK, "%s: layout LFSCK phase2 scan stop: rc = %d\n",
3418                lfsck_lfsck2name(lfsck), rc);
3419
3420         RETURN(rc);
3421 }
3422
3423 static int
3424 lfsck_layout_slave_async_interpret(const struct lu_env *env,
3425                                    struct ptlrpc_request *req,
3426                                    void *args, int rc)
3427 {
3428         struct lfsck_layout_slave_async_args *llsaa = args;
3429         struct obd_export                    *exp   = llsaa->llsaa_exp;
3430         struct lfsck_component               *com   = llsaa->llsaa_com;
3431         struct lfsck_layout_slave_target     *llst  = llsaa->llsaa_llst;
3432         struct lfsck_layout_slave_data       *llsd  = com->lc_data;
3433         struct lfsck_reply                   *lr    = NULL;
3434         bool                                  done  = false;
3435
3436         if (rc != 0) {
3437                 /* It is quite probably caused by target crash,
3438                  * to make the LFSCK can go ahead, assume that
3439                  * the target finished the LFSCK prcoessing. */
3440                 done = true;
3441         } else {
3442                 lr = req_capsule_server_get(&req->rq_pill, &RMF_LFSCK_REPLY);
3443                 if (lr->lr_status != LS_SCANNING_PHASE1 &&
3444                     lr->lr_status != LS_SCANNING_PHASE2)
3445                         done = true;
3446         }
3447
3448         if (done) {
3449                 CDEBUG(D_LFSCK, "%s: layout LFSCK slave gets the MDT %x "
3450                        "status %d\n", lfsck_lfsck2name(com->lc_lfsck),
3451                        llst->llst_index, lr != NULL ? lr->lr_status : rc);
3452
3453                 lfsck_layout_llst_del(llsd, llst);
3454         }
3455
3456         lfsck_layout_llst_put(llst);
3457         lfsck_component_put(env, com);
3458         class_export_put(exp);
3459
3460         return 0;
3461 }
3462
3463 static int lfsck_layout_async_query(const struct lu_env *env,
3464                                     struct lfsck_component *com,
3465                                     struct obd_export *exp,
3466                                     struct lfsck_layout_slave_target *llst,
3467                                     struct lfsck_request *lr,
3468                                     struct ptlrpc_request_set *set)
3469 {
3470         struct lfsck_layout_slave_async_args *llsaa;
3471         struct ptlrpc_request                *req;
3472         struct lfsck_request                 *tmp;
3473         int                                   rc;
3474         ENTRY;
3475
3476         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LFSCK_QUERY);
3477         if (req == NULL)
3478                 RETURN(-ENOMEM);
3479
3480         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_QUERY);
3481         if (rc != 0) {
3482                 ptlrpc_request_free(req);
3483                 RETURN(rc);
3484         }
3485
3486         tmp = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
3487         *tmp = *lr;
3488         ptlrpc_request_set_replen(req);
3489
3490         llsaa = ptlrpc_req_async_args(req);
3491         llsaa->llsaa_exp = exp;
3492         llsaa->llsaa_com = lfsck_component_get(com);
3493         llsaa->llsaa_llst = llst;
3494         req->rq_interpret_reply = lfsck_layout_slave_async_interpret;
3495         ptlrpc_set_add_req(set, req);
3496
3497         RETURN(0);
3498 }
3499
3500 static int lfsck_layout_async_notify(const struct lu_env *env,
3501                                      struct obd_export *exp,
3502                                      struct lfsck_request *lr,
3503                                      struct ptlrpc_request_set *set)
3504 {
3505         struct ptlrpc_request   *req;
3506         struct lfsck_request    *tmp;
3507         int                      rc;
3508         ENTRY;
3509
3510         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LFSCK_NOTIFY);
3511         if (req == NULL)
3512                 RETURN(-ENOMEM);
3513
3514         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_NOTIFY);
3515         if (rc != 0) {
3516                 ptlrpc_request_free(req);
3517                 RETURN(rc);
3518         }
3519
3520         tmp = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
3521         *tmp = *lr;
3522         ptlrpc_request_set_replen(req);
3523         ptlrpc_set_add_req(set, req);
3524
3525         RETURN(0);
3526 }
3527
3528 static int
3529 lfsck_layout_slave_query_master(const struct lu_env *env,
3530                                 struct lfsck_component *com)
3531 {
3532         struct lfsck_request             *lr    = &lfsck_env_info(env)->lti_lr;
3533         struct lfsck_instance            *lfsck = com->lc_lfsck;
3534         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
3535         struct lfsck_layout_slave_target *llst;
3536         struct obd_export                *exp;
3537         struct ptlrpc_request_set        *set;
3538         int                               rc    = 0;
3539         int                               rc1   = 0;
3540         ENTRY;
3541
3542         set = ptlrpc_prep_set();
3543         if (set == NULL)
3544                 GOTO(log, rc = -ENOMEM);
3545
3546         memset(lr, 0, sizeof(*lr));
3547         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
3548         lr->lr_event = LE_QUERY;
3549         lr->lr_active = LFSCK_TYPE_LAYOUT;
3550
3551         llsd->llsd_touch_gen++;
3552         spin_lock(&llsd->llsd_lock);
3553         while (!list_empty(&llsd->llsd_master_list)) {
3554                 llst = list_entry(llsd->llsd_master_list.next,
3555                                   struct lfsck_layout_slave_target,
3556                                   llst_list);
3557                 if (llst->llst_gen == llsd->llsd_touch_gen)
3558                         break;
3559
3560                 llst->llst_gen = llsd->llsd_touch_gen;
3561                 list_move_tail(&llst->llst_list,
3562                                &llsd->llsd_master_list);
3563                 atomic_inc(&llst->llst_ref);
3564                 spin_unlock(&llsd->llsd_lock);
3565
3566                 exp = lustre_find_lwp_by_index(lfsck->li_obd->obd_name,
3567                                                llst->llst_index);
3568                 if (exp == NULL) {
3569                         lfsck_layout_llst_del(llsd, llst);
3570                         lfsck_layout_llst_put(llst);
3571                         spin_lock(&llsd->llsd_lock);
3572                         continue;
3573                 }
3574
3575                 rc = lfsck_layout_async_query(env, com, exp, llst, lr, set);
3576                 if (rc != 0) {
3577                         CDEBUG(D_LFSCK, "%s: layout LFSCK slave fail to "
3578                                "query %s for layout: rc = %d\n",
3579                                lfsck_lfsck2name(lfsck),
3580                                exp->exp_obd->obd_name, rc);
3581
3582                         rc1 = rc;
3583                         lfsck_layout_llst_put(llst);
3584                         class_export_put(exp);
3585                 }
3586                 spin_lock(&llsd->llsd_lock);
3587         }
3588         spin_unlock(&llsd->llsd_lock);
3589
3590         rc = ptlrpc_set_wait(set);
3591         ptlrpc_set_destroy(set);
3592
3593         GOTO(log, rc = (rc1 != 0 ? rc1 : rc));
3594
3595 log:
3596         CDEBUG(D_LFSCK, "%s: layout LFSCK slave queries master: rc = %d\n",
3597                lfsck_lfsck2name(com->lc_lfsck), rc);
3598
3599         return rc;
3600 }
3601
3602 static void
3603 lfsck_layout_slave_notify_master(const struct lu_env *env,
3604                                  struct lfsck_component *com,
3605                                  enum lfsck_events event, int result)
3606 {
3607         struct lfsck_layout              *lo    = com->lc_file_ram;
3608         struct lfsck_instance            *lfsck = com->lc_lfsck;
3609         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
3610         struct lfsck_request             *lr    = &lfsck_env_info(env)->lti_lr;
3611         struct lfsck_layout_slave_target *llst;
3612         struct obd_export                *exp;
3613         struct ptlrpc_request_set        *set;
3614         int                               rc;
3615         ENTRY;
3616
3617         CDEBUG(D_LFSCK, "%s: layout LFSCK slave notifies master\n",
3618                lfsck_lfsck2name(com->lc_lfsck));
3619
3620         set = ptlrpc_prep_set();
3621         if (set == NULL)
3622                 RETURN_EXIT;
3623
3624         memset(lr, 0, sizeof(*lr));
3625         lr->lr_event = event;
3626         lr->lr_flags = LEF_FROM_OST;
3627         lr->lr_status = result;
3628         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
3629         lr->lr_active = LFSCK_TYPE_LAYOUT;
3630         lr->lr_flags2 = lo->ll_flags;
3631         llsd->llsd_touch_gen++;
3632         spin_lock(&llsd->llsd_lock);
3633         while (!list_empty(&llsd->llsd_master_list)) {
3634                 llst = list_entry(llsd->llsd_master_list.next,
3635                                   struct lfsck_layout_slave_target,
3636                                   llst_list);
3637                 if (llst->llst_gen == llsd->llsd_touch_gen)
3638                         break;
3639
3640                 llst->llst_gen = llsd->llsd_touch_gen;
3641                 list_move_tail(&llst->llst_list,
3642                                &llsd->llsd_master_list);
3643                 atomic_inc(&llst->llst_ref);
3644                 spin_unlock(&llsd->llsd_lock);
3645
3646                 exp = lustre_find_lwp_by_index(lfsck->li_obd->obd_name,
3647                                                llst->llst_index);
3648                 if (exp == NULL) {
3649                         lfsck_layout_llst_del(llsd, llst);
3650                         lfsck_layout_llst_put(llst);
3651                         spin_lock(&llsd->llsd_lock);
3652                         continue;
3653                 }
3654
3655                 rc = lfsck_layout_async_notify(env, exp, lr, set);
3656                 if (rc != 0)
3657                         CDEBUG(D_LFSCK, "%s: layout LFSCK slave fail to "
3658                                "notify %s for layout: rc = %d\n",
3659                                lfsck_lfsck2name(lfsck),
3660                                exp->exp_obd->obd_name, rc);
3661
3662                 lfsck_layout_llst_put(llst);
3663                 class_export_put(exp);
3664                 spin_lock(&llsd->llsd_lock);
3665         }
3666         spin_unlock(&llsd->llsd_lock);
3667
3668         ptlrpc_set_wait(set);
3669         ptlrpc_set_destroy(set);
3670
3671         RETURN_EXIT;
3672 }
3673
3674 /*
3675  * \ret -ENODATA: unrecognized stripe
3676  * \ret = 0     : recognized stripe
3677  * \ret < 0     : other failures
3678  */
3679 static int lfsck_layout_master_check_pairs(const struct lu_env *env,
3680                                            struct lfsck_component *com,
3681                                            struct lu_fid *cfid,
3682                                            struct lu_fid *pfid)
3683 {
3684         struct lfsck_thread_info        *info   = lfsck_env_info(env);
3685         struct lu_buf                   *buf    = &info->lti_big_buf;
3686         struct ost_id                   *oi     = &info->lti_oi;
3687         struct dt_object                *obj;
3688         struct lov_mds_md_v1            *lmm;
3689         struct lov_ost_data_v1          *objs;
3690         __u32                            idx    = pfid->f_stripe_idx;
3691         __u32                            magic;
3692         int                              rc     = 0;
3693         int                              i;
3694         __u16                            count;
3695         ENTRY;
3696
3697         pfid->f_ver = 0;
3698         obj = lfsck_object_find_by_dev(env, com->lc_lfsck->li_bottom, pfid);
3699         if (IS_ERR(obj))
3700                 RETURN(PTR_ERR(obj));
3701
3702         dt_read_lock(env, obj, 0);
3703         if (unlikely(dt_object_exists(obj) == 0 ||
3704                      lfsck_is_dead_obj(obj)))
3705                 GOTO(unlock, rc = -ENOENT);
3706
3707         if (!S_ISREG(lfsck_object_type(obj)))
3708                 GOTO(unlock, rc = -ENODATA);
3709
3710         rc = lfsck_layout_get_lovea(env, obj, buf);
3711         if (rc < 0)
3712                 GOTO(unlock, rc);
3713
3714         if (rc == 0)
3715                 GOTO(unlock, rc = -ENODATA);
3716
3717         lmm = buf->lb_buf;
3718         rc = lfsck_layout_verify_header(lmm);
3719         if (rc != 0)
3720                 GOTO(unlock, rc);
3721
3722         /* Currently, we only support LOV_MAGIC_V1/LOV_MAGIC_V3 which has
3723          * been verified in lfsck_layout_verify_header() already. If some
3724          * new magic introduced in the future, then layout LFSCK needs to
3725          * be updated also. */
3726         magic = le32_to_cpu(lmm->lmm_magic);
3727         if (magic == LOV_MAGIC_V1) {
3728                 objs = &lmm->lmm_objects[0];
3729         } else {
3730                 LASSERT(magic == LOV_MAGIC_V3);
3731                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
3732         }
3733
3734         fid_to_ostid(cfid, oi);
3735         count = le16_to_cpu(lmm->lmm_stripe_count);
3736         for (i = 0; i < count; i++, objs++) {
3737                 struct ost_id oi2;
3738
3739                 ostid_le_to_cpu(&objs->l_ost_oi, &oi2);
3740                 if (memcmp(oi, &oi2, sizeof(*oi)) == 0)
3741                         GOTO(unlock, rc = (i != idx ? -ENODATA : 0));
3742         }
3743
3744         GOTO(unlock, rc = -ENODATA);
3745
3746 unlock:
3747         dt_read_unlock(env, obj);
3748         lu_object_put(env, &obj->do_lu);
3749
3750         return rc;
3751 }
3752
3753 /*
3754  * The LFSCK-on-OST will ask the LFSCK-on-MDT to check whether the given
3755  * MDT-object/OST-object pairs match or not to aviod transfer MDT-object
3756  * layout EA from MDT to OST. On one hand, the OST no need to understand
3757  * the layout EA structure; on the other hand, it may cause trouble when
3758  * transfer large layout EA from MDT to OST via normal OUT RPC.
3759  *
3760  * \ret > 0: unrecognized stripe
3761  * \ret = 0: recognized stripe
3762  * \ret < 0: other failures
3763  */
3764 static int lfsck_layout_slave_check_pairs(const struct lu_env *env,
3765                                           struct lfsck_component *com,
3766                                           struct lu_fid *cfid,
3767                                           struct lu_fid *pfid)
3768 {
3769         struct lfsck_instance    *lfsck  = com->lc_lfsck;
3770         struct obd_device        *obd    = lfsck->li_obd;
3771         struct seq_server_site   *ss     =
3772                         lu_site2seq(lfsck->li_bottom->dd_lu_dev.ld_site);
3773         struct obd_export        *exp    = NULL;
3774         struct ptlrpc_request    *req    = NULL;
3775         struct lfsck_request     *lr;
3776         struct lu_seq_range      *range  = &lfsck_env_info(env)->lti_range;
3777         int                       rc     = 0;
3778         ENTRY;
3779
3780         if (unlikely(fid_is_idif(pfid)))
3781                 RETURN(1);
3782
3783         fld_range_set_any(range);
3784         rc = fld_server_lookup(env, ss->ss_server_fld, fid_seq(pfid), range);
3785         if (rc != 0)
3786                 RETURN(rc == -ENOENT ? 1 : rc);
3787
3788         if (unlikely(!fld_range_is_mdt(range)))
3789                 RETURN(1);
3790
3791         exp = lustre_find_lwp_by_index(obd->obd_name, range->lsr_index);
3792         if (unlikely(exp == NULL))
3793                 RETURN(1);
3794
3795         if (!(exp_connect_flags(exp) & OBD_CONNECT_LFSCK))
3796                 GOTO(out, rc = -EOPNOTSUPP);
3797
3798         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LFSCK_NOTIFY);
3799         if (req == NULL)
3800                 GOTO(out, rc = -ENOMEM);
3801
3802         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_NOTIFY);
3803         if (rc != 0) {
3804                 ptlrpc_request_free(req);
3805
3806                 GOTO(out, rc);
3807         }
3808
3809         lr = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
3810         memset(lr, 0, sizeof(*lr));
3811         lr->lr_event = LE_PAIRS_VERIFY;
3812         lr->lr_active = LFSCK_TYPE_LAYOUT;
3813         lr->lr_fid = *cfid; /* OST-object itself FID. */
3814         lr->lr_fid2 = *pfid; /* The claimed parent FID. */
3815
3816         ptlrpc_request_set_replen(req);
3817         rc = ptlrpc_queue_wait(req);
3818         ptlrpc_req_finished(req);
3819
3820         if (rc == -ENOENT || rc == -ENODATA)
3821                 rc = 1;
3822
3823         GOTO(out, rc);
3824
3825 out:
3826         if (exp != NULL)
3827                 class_export_put(exp);
3828
3829         return rc;
3830 }
3831
3832 static int lfsck_layout_slave_repair_pfid(const struct lu_env *env,
3833                                           struct lfsck_component *com,
3834                                           struct lfsck_request *lr)
3835 {
3836         struct lfsck_thread_info        *info   = lfsck_env_info(env);
3837         struct filter_fid               *ff     = &info->lti_new_pfid;
3838         struct lu_buf                   *buf;
3839         struct dt_device                *dev    = com->lc_lfsck->li_bottom;
3840         struct dt_object                *obj;
3841         struct thandle                  *th     = NULL;
3842         int                              rc     = 0;
3843         ENTRY;
3844
3845         obj = lfsck_object_find_by_dev(env, dev, &lr->lr_fid);
3846         if (IS_ERR(obj))
3847                 GOTO(log, rc = PTR_ERR(obj));
3848
3849         fid_cpu_to_le(&ff->ff_parent, &lr->lr_fid2);
3850         buf = lfsck_buf_get(env, ff, sizeof(*ff));
3851         dt_write_lock(env, obj, 0);
3852         if (unlikely(dt_object_exists(obj) == 0 ||
3853                      lfsck_is_dead_obj(obj)))
3854                 GOTO(unlock, rc = 0);
3855
3856         th = dt_trans_create(env, dev);
3857         if (IS_ERR(th))
3858                 GOTO(unlock, rc = PTR_ERR(th));
3859
3860         rc = dt_declare_xattr_set(env, obj, buf, XATTR_NAME_FID, 0, th);
3861         if (rc != 0)
3862                 GOTO(stop, rc);
3863
3864         rc = dt_trans_start_local(env, dev, th);
3865         if (rc != 0)
3866                 GOTO(stop, rc);
3867
3868         rc = dt_xattr_set(env, obj, buf, XATTR_NAME_FID, 0, th, BYPASS_CAPA);
3869
3870         GOTO(stop, rc);
3871
3872 stop:
3873         dt_trans_stop(env, dev, th);
3874
3875 unlock:
3876         dt_write_unlock(env, obj);
3877         lu_object_put(env, &obj->do_lu);
3878
3879 log:
3880         CDEBUG(D_LFSCK, "%s: layout LFSCK slave repaired pfid for "DFID
3881                ", parent "DFID": rc = %d\n", lfsck_lfsck2name(com->lc_lfsck),
3882                PFID(&lr->lr_fid), PFID(&lr->lr_fid2), rc);
3883
3884         return rc;
3885 }
3886
3887 /* layout APIs */
3888
3889 static void lfsck_layout_slave_quit(const struct lu_env *env,
3890                                     struct lfsck_component *com);
3891
3892 static int lfsck_layout_reset(const struct lu_env *env,
3893                               struct lfsck_component *com, bool init)
3894 {
3895         struct lfsck_layout     *lo    = com->lc_file_ram;
3896         int                      rc;
3897
3898         down_write(&com->lc_sem);
3899         if (init) {
3900                 memset(lo, 0, com->lc_file_size);
3901         } else {
3902                 __u32 count = lo->ll_success_count;
3903                 __u64 last_time = lo->ll_time_last_complete;
3904
3905                 memset(lo, 0, com->lc_file_size);
3906                 lo->ll_success_count = count;
3907                 lo->ll_time_last_complete = last_time;
3908         }
3909
3910         lo->ll_magic = LFSCK_LAYOUT_MAGIC;
3911         lo->ll_status = LS_INIT;
3912
3913         if (com->lc_lfsck->li_master) {
3914                 struct lfsck_assistant_data *lad = com->lc_data;
3915
3916                 lad->lad_incomplete = 0;
3917                 CFS_RESET_BITMAP(lad->lad_bitmap);
3918         }
3919
3920         rc = lfsck_layout_store(env, com);
3921         up_write(&com->lc_sem);
3922
3923         CDEBUG(D_LFSCK, "%s: layout LFSCK reset: rc = %d\n",
3924                lfsck_lfsck2name(com->lc_lfsck), rc);
3925
3926         return rc;
3927 }
3928
3929 static void lfsck_layout_fail(const struct lu_env *env,
3930                               struct lfsck_component *com, bool new_checked)
3931 {
3932         struct lfsck_layout *lo = com->lc_file_ram;
3933
3934         down_write(&com->lc_sem);
3935         if (new_checked)
3936                 com->lc_new_checked++;
3937         lfsck_layout_record_failure(env, com->lc_lfsck, lo);
3938         up_write(&com->lc_sem);
3939 }
3940
3941 static int lfsck_layout_master_checkpoint(const struct lu_env *env,
3942                                           struct lfsck_component *com, bool init)
3943 {
3944         struct lfsck_instance   *lfsck   = com->lc_lfsck;
3945         struct lfsck_layout     *lo      = com->lc_file_ram;
3946         int                      rc;
3947
3948         if (!init) {
3949                 rc = lfsck_checkpoint_generic(env, com);
3950                 if (rc != 0)
3951                         return rc > 0 ? 0 : rc;
3952         }
3953
3954         down_write(&com->lc_sem);
3955         if (init) {
3956                 lo->ll_pos_latest_start =
3957                                 lfsck->li_pos_checkpoint.lp_oit_cookie;
3958         } else {
3959                 lo->ll_pos_last_checkpoint =
3960                                 lfsck->li_pos_checkpoint.lp_oit_cookie;
3961                 lo->ll_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
3962                                 HALF_SEC - lfsck->li_time_last_checkpoint);
3963                 lo->ll_time_last_checkpoint = cfs_time_current_sec();
3964                 lo->ll_objs_checked_phase1 += com->lc_new_checked;
3965                 com->lc_new_checked = 0;
3966         }
3967
3968         rc = lfsck_layout_store(env, com);
3969         up_write(&com->lc_sem);
3970
3971         CDEBUG(D_LFSCK, "%s: layout LFSCK master checkpoint at the pos ["
3972                LPU64"]: rc = %d\n", lfsck_lfsck2name(lfsck),
3973                lfsck->li_pos_current.lp_oit_cookie, rc);
3974
3975         return rc;
3976 }
3977
3978 static int lfsck_layout_slave_checkpoint(const struct lu_env *env,
3979                                          struct lfsck_component *com, bool init)
3980 {
3981         struct lfsck_instance   *lfsck = com->lc_lfsck;
3982         struct lfsck_layout     *lo    = com->lc_file_ram;
3983         int                      rc;
3984
3985         if (com->lc_new_checked == 0 && !init)
3986                 return 0;
3987
3988         down_write(&com->lc_sem);
3989         if (init) {
3990                 lo->ll_pos_latest_start =
3991                                 lfsck->li_pos_checkpoint.lp_oit_cookie;
3992         } else {
3993                 lo->ll_pos_last_checkpoint =
3994                                 lfsck->li_pos_checkpoint.lp_oit_cookie;
3995                 lo->ll_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
3996                                 HALF_SEC - lfsck->li_time_last_checkpoint);
3997                 lo->ll_time_last_checkpoint = cfs_time_current_sec();
3998                 lo->ll_objs_checked_phase1 += com->lc_new_checked;
3999                 com->lc_new_checked = 0;
4000         }
4001
4002         rc = lfsck_layout_store(env, com);
4003         up_write(&com->lc_sem);
4004
4005         CDEBUG(D_LFSCK, "%s: layout LFSCK slave checkpoint at the pos ["
4006                LPU64"]: rc = %d\n", lfsck_lfsck2name(lfsck),
4007                lfsck->li_pos_current.lp_oit_cookie, rc);
4008
4009         return rc;
4010 }
4011
4012 static int lfsck_layout_prep(const struct lu_env *env,
4013                              struct lfsck_component *com,
4014                              struct lfsck_start *start)
4015 {
4016         struct lfsck_instance   *lfsck  = com->lc_lfsck;
4017         struct lfsck_layout     *lo     = com->lc_file_ram;
4018         struct lfsck_position   *pos    = &com->lc_pos_start;
4019
4020         fid_zero(&pos->lp_dir_parent);
4021         pos->lp_dir_cookie = 0;
4022         if (lo->ll_status == LS_COMPLETED ||
4023             lo->ll_status == LS_PARTIAL ||
4024             /* To handle orphan, must scan from the beginning. */
4025             (start != NULL && start->ls_flags & LPF_OST_ORPHAN)) {
4026                 int rc;
4027
4028                 rc = lfsck_layout_reset(env, com, false);
4029                 if (rc == 0)
4030                         rc = lfsck_set_param(env, lfsck, start, true);
4031
4032                 if (rc != 0) {
4033                         CDEBUG(D_LFSCK, "%s: layout LFSCK prep failed: "
4034                                "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
4035
4036                         return rc;
4037                 }
4038         }
4039
4040         down_write(&com->lc_sem);
4041         lo->ll_time_latest_start = cfs_time_current_sec();
4042         spin_lock(&lfsck->li_lock);
4043         if (lo->ll_flags & LF_SCANNED_ONCE) {
4044                 if (!lfsck->li_drop_dryrun ||
4045                     lo->ll_pos_first_inconsistent == 0) {
4046                         lo->ll_status = LS_SCANNING_PHASE2;
4047                         list_move_tail(&com->lc_link,
4048                                        &lfsck->li_list_double_scan);
4049                         pos->lp_oit_cookie = 0;
4050                 } else {
4051                         int i;
4052
4053                         lo->ll_status = LS_SCANNING_PHASE1;
4054                         lo->ll_run_time_phase1 = 0;
4055                         lo->ll_run_time_phase2 = 0;
4056                         lo->ll_objs_checked_phase1 = 0;
4057                         lo->ll_objs_checked_phase2 = 0;
4058                         lo->ll_objs_failed_phase1 = 0;
4059                         lo->ll_objs_failed_phase2 = 0;
4060                         for (i = 0; i < LLIT_MAX; i++)
4061                                 lo->ll_objs_repaired[i] = 0;
4062
4063                         pos->lp_oit_cookie = lo->ll_pos_first_inconsistent;
4064                         fid_zero(&com->lc_fid_latest_scanned_phase2);
4065                 }
4066         } else {
4067                 lo->ll_status = LS_SCANNING_PHASE1;
4068                 if (!lfsck->li_drop_dryrun ||
4069                     lo->ll_pos_first_inconsistent == 0)
4070                         pos->lp_oit_cookie = lo->ll_pos_last_checkpoint + 1;
4071                 else
4072                         pos->lp_oit_cookie = lo->ll_pos_first_inconsistent;
4073         }
4074         spin_unlock(&lfsck->li_lock);
4075         up_write(&com->lc_sem);
4076
4077         return 0;
4078 }
4079
4080 static int lfsck_layout_slave_prep(const struct lu_env *env,
4081                                    struct lfsck_component *com,
4082                                    struct lfsck_start_param *lsp)
4083 {
4084         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
4085         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4086         struct lfsck_layout             *lo     = com->lc_file_ram;
4087         struct lfsck_start              *start  = lsp->lsp_start;
4088         int                              rc;
4089
4090         rc = lfsck_layout_prep(env, com, start);
4091         if (rc != 0)
4092                 return rc;
4093
4094         if (lo->ll_flags & LF_CRASHED_LASTID &&
4095             list_empty(&llsd->llsd_master_list)) {
4096                 LASSERT(lfsck->li_out_notify != NULL);
4097
4098                 lfsck->li_out_notify(env, lfsck->li_out_notify_data,
4099                                      LE_LASTID_REBUILDING);
4100         }
4101
4102         if (!lsp->lsp_index_valid)
4103                 return 0;
4104
4105         rc = lfsck_layout_llst_add(llsd, lsp->lsp_index);
4106         if (rc == 0 && start != NULL && start->ls_flags & LPF_OST_ORPHAN) {
4107                 LASSERT(!llsd->llsd_rbtree_valid);
4108
4109                 write_lock(&llsd->llsd_rb_lock);
4110                 rc = lfsck_rbtree_setup(env, com);
4111                 write_unlock(&llsd->llsd_rb_lock);
4112         }
4113
4114         CDEBUG(D_LFSCK, "%s: layout LFSCK slave prep done, start pos ["
4115                LPU64"]\n", lfsck_lfsck2name(lfsck),
4116                com->lc_pos_start.lp_oit_cookie);
4117
4118         return rc;
4119 }
4120
4121 static int lfsck_layout_master_prep(const struct lu_env *env,
4122                                     struct lfsck_component *com,
4123                                     struct lfsck_start_param *lsp)
4124 {
4125         int rc;
4126         ENTRY;
4127
4128         rc = lfsck_layout_load_bitmap(env, com);
4129         if (rc != 0) {
4130                 rc = lfsck_layout_reset(env, com, false);
4131                 if (rc == 0)
4132                         rc = lfsck_set_param(env, com->lc_lfsck,
4133                                              lsp->lsp_start, true);
4134
4135                 if (rc != 0)
4136                         GOTO(log, rc);
4137         }
4138
4139         rc = lfsck_layout_prep(env, com, lsp->lsp_start);
4140         if (rc != 0)
4141                 RETURN(rc);
4142
4143         rc = lfsck_start_assistant(env, com, lsp);
4144
4145         GOTO(log, rc);
4146
4147 log:
4148         CDEBUG(D_LFSCK, "%s: layout LFSCK master prep done, start pos ["
4149                LPU64"]\n", lfsck_lfsck2name(com->lc_lfsck),
4150                com->lc_pos_start.lp_oit_cookie);
4151
4152         return 0;
4153 }
4154
4155 /* Pre-fetch the attribute for each stripe in the given layout EA. */
4156 static int lfsck_layout_scan_stripes(const struct lu_env *env,
4157                                      struct lfsck_component *com,
4158                                      struct dt_object *parent,
4159                                      struct lov_mds_md_v1 *lmm)
4160 {
4161         struct lfsck_thread_info        *info    = lfsck_env_info(env);
4162         struct lfsck_instance           *lfsck   = com->lc_lfsck;
4163         struct lfsck_bookmark           *bk      = &lfsck->li_bookmark_ram;
4164         struct lfsck_layout             *lo      = com->lc_file_ram;
4165         struct lfsck_assistant_data     *lad     = com->lc_data;
4166         struct lfsck_layout_object      *llo     = NULL;
4167         struct lov_ost_data_v1          *objs;
4168         struct lfsck_tgt_descs          *ltds    = &lfsck->li_ost_descs;
4169         struct ptlrpc_thread            *mthread = &lfsck->li_thread;
4170         struct ptlrpc_thread            *athread = &lad->lad_thread;
4171         struct l_wait_info               lwi     = { 0 };
4172         struct lu_buf                    buf;
4173         int                              rc      = 0;
4174         int                              i;
4175         __u32                            magic;
4176         __u16                            count;
4177         __u16                            gen;
4178         ENTRY;
4179
4180         lfsck_buf_init(&buf, &info->lti_old_pfid,
4181                        sizeof(struct filter_fid_old));
4182         count = le16_to_cpu(lmm->lmm_stripe_count);
4183         gen = le16_to_cpu(lmm->lmm_layout_gen);
4184         /* Currently, we only support LOV_MAGIC_V1/LOV_MAGIC_V3 which has
4185          * been verified in lfsck_layout_verify_header() already. If some
4186          * new magic introduced in the future, then layout LFSCK needs to
4187          * be updated also. */
4188         magic = le32_to_cpu(lmm->lmm_magic);
4189         if (magic == LOV_MAGIC_V1) {
4190                 objs = &lmm->lmm_objects[0];
4191         } else {
4192                 LASSERT(magic == LOV_MAGIC_V3);
4193                 objs = &((struct lov_mds_md_v3 *)lmm)->lmm_objects[0];
4194         }
4195
4196         for (i = 0; i < count; i++, objs++) {
4197                 struct lu_fid           *fid    = &info->lti_fid;
4198                 struct ost_id           *oi     = &info->lti_oi;
4199                 struct lfsck_layout_req *llr;
4200                 struct lfsck_tgt_desc   *tgt    = NULL;
4201                 struct dt_object        *cobj   = NULL;
4202                 __u32                    index;
4203                 bool                     wakeup = false;
4204
4205                 if (unlikely(lovea_slot_is_dummy(objs)))
4206                         continue;
4207
4208                 l_wait_event(mthread->t_ctl_waitq,
4209                              bk->lb_async_windows == 0 ||
4210                              lad->lad_prefetched < bk->lb_async_windows ||
4211                              !thread_is_running(mthread) ||
4212                              thread_is_stopped(athread),
4213                              &lwi);
4214
4215                 if (unlikely(!thread_is_running(mthread)) ||
4216                              thread_is_stopped(athread))
4217                         GOTO(out, rc = 0);
4218
4219                 if (unlikely(lfsck_is_dead_obj(parent)))
4220                         GOTO(out, rc = 0);
4221
4222                 ostid_le_to_cpu(&objs->l_ost_oi, oi);
4223                 index = le32_to_cpu(objs->l_ost_idx);
4224                 rc = ostid_to_fid(fid, oi, index);
4225                 if (rc != 0) {
4226                         CDEBUG(D_LFSCK, "%s: get invalid layout EA for "DFID
4227                                ": "DOSTID", idx:%u\n", lfsck_lfsck2name(lfsck),
4228                                PFID(lfsck_dto2fid(parent)), POSTID(oi), index);
4229                         goto next;
4230                 }
4231
4232                 tgt = lfsck_tgt_get(ltds, index);
4233                 if (unlikely(tgt == NULL)) {
4234                         CDEBUG(D_LFSCK, "%s: cannot talk with OST %x which "
4235                                "did not join the layout LFSCK\n",
4236                                lfsck_lfsck2name(lfsck), index);
4237                         lfsck_lad_set_bitmap(env, com, index);
4238                         goto next;
4239                 }
4240
4241                 /* There is potential deadlock race condition between object
4242                  * destroy and layout LFSCK. Consider the following scenario:
4243                  *
4244                  * 1) The LFSCK thread obtained the parent object firstly, at
4245                  *    that time, the parent object has not been destroyed yet.
4246                  *
4247                  * 2) One RPC service thread destroyed the parent and all its
4248                  *    children objects. Because the LFSCK is referencing the
4249                  *    parent object, then the parent object will be marked as
4250                  *    dying in RAM. On the other hand, the parent object is
4251                  *    referencing all its children objects, then all children
4252                  *    objects will be marked as dying in RAM also.
4253                  *
4254                  * 3) The LFSCK thread tries to find some child object with
4255                  *    the parent object referenced. Then it will find that the
4256                  *    child object is dying. According to the object visibility
4257                  *    rules: the object with dying flag cannot be returned to
4258                  *    others. So the LFSCK thread has to wait until the dying
4259                  *    object has been purged from RAM, then it can allocate a
4260                  *    new object (with the same FID) in RAM. Unfortunately, the
4261                  *    LFSCK thread itself is referencing the parent object, and
4262                  *    cause the parent object cannot be purged, then cause the
4263                  *    child object cannot be purged also. So the LFSCK thread
4264                  *    will fall into deadlock.
4265                  *
4266                  * We introduce non-blocked version lu_object_find() to allow
4267                  * the LFSCK thread to return failure immediately (instead of
4268                  * wait) when it finds dying (child) object, then the LFSCK
4269                  * thread can check whether the parent object is dying or not.
4270                  * So avoid above deadlock. LU-5395 */
4271                 cobj = lfsck_object_find_by_dev_nowait(env, tgt->ltd_tgt, fid);
4272                 if (IS_ERR(cobj)) {
4273                         if (lfsck_is_dead_obj(parent)) {
4274                                 lfsck_tgt_put(tgt);
4275
4276                                 GOTO(out, rc = 0);
4277                         }
4278
4279                         rc = PTR_ERR(cobj);
4280                         goto next;
4281                 }
4282
4283                 rc = dt_declare_attr_get(env, cobj, BYPASS_CAPA);
4284                 if (rc != 0)
4285                         goto next;
4286
4287                 rc = dt_declare_xattr_get(env, cobj, &buf, XATTR_NAME_FID,
4288                                           BYPASS_CAPA);
4289                 if (rc != 0)
4290                         goto next;
4291
4292                 if (llo == NULL) {
4293                         llo = lfsck_layout_object_init(env, parent,
4294                                 lfsck->li_pos_current.lp_oit_cookie, gen);
4295                         if (IS_ERR(llo)) {
4296                                 rc = PTR_ERR(llo);
4297                                 goto next;
4298                         }
4299                 }
4300
4301                 llr = lfsck_layout_assistant_req_init(llo, cobj, index, i);
4302                 if (IS_ERR(llr)) {
4303                         rc = PTR_ERR(llr);
4304                         goto next;
4305                 }
4306
4307                 cobj = NULL;
4308                 spin_lock(&lad->lad_lock);
4309                 if (lad->lad_assistant_status < 0) {
4310                         spin_unlock(&lad->lad_lock);
4311                         lfsck_layout_assistant_req_fini(env, &llr->llr_lar);
4312                         lfsck_tgt_put(tgt);
4313                         RETURN(lad->lad_assistant_status);
4314                 }
4315
4316                 list_add_tail(&llr->llr_lar.lar_list, &lad->lad_req_list);
4317                 if (lad->lad_prefetched == 0)
4318                         wakeup = true;
4319
4320                 lad->lad_prefetched++;
4321                 spin_unlock(&lad->lad_lock);
4322                 if (wakeup)
4323                         wake_up_all(&athread->t_ctl_waitq);
4324
4325 next:
4326                 down_write(&com->lc_sem);
4327                 com->lc_new_checked++;
4328                 if (rc < 0)
4329                         lfsck_layout_record_failure(env, lfsck, lo);
4330                 up_write(&com->lc_sem);
4331
4332                 if (cobj != NULL && !IS_ERR(cobj))
4333                         lu_object_put(env, &cobj->do_lu);
4334
4335                 if (likely(tgt != NULL))
4336                         lfsck_tgt_put(tgt);
4337
4338                 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
4339                         GOTO(out, rc);
4340         }
4341
4342         GOTO(out, rc = 0);
4343
4344 out:
4345         if (llo != NULL && !IS_ERR(llo))
4346                 lfsck_layout_object_put(env, llo);
4347
4348         return rc;
4349 }
4350
4351 /* For the given object, read its layout EA locally. For each stripe, pre-fetch
4352  * the OST-object's attribute and generate an structure lfsck_layout_req on the
4353  * list ::lad_req_list.
4354  *
4355  * For each request on above list, the lfsck_layout_assistant thread compares
4356  * the OST side attribute with local attribute, if inconsistent, then repair it.
4357  *
4358  * All above processing is async mode with pipeline. */
4359 static int lfsck_layout_master_exec_oit(const struct lu_env *env,
4360                                         struct lfsck_component *com,
4361                                         struct dt_object *obj)
4362 {
4363         struct lfsck_thread_info        *info   = lfsck_env_info(env);
4364         struct ost_id                   *oi     = &info->lti_oi;
4365         struct lfsck_layout             *lo     = com->lc_file_ram;
4366         struct lfsck_assistant_data     *lad    = com->lc_data;
4367         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4368         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
4369         struct thandle                  *handle = NULL;
4370         struct lu_buf                   *buf    = &info->lti_big_buf;
4371         struct lov_mds_md_v1            *lmm    = NULL;
4372         struct dt_device                *dev    = lfsck->li_bottom;
4373         struct lustre_handle             lh     = { 0 };
4374         struct lu_buf                    ea_buf = { NULL };
4375         int                              rc     = 0;
4376         int                              size   = 0;
4377         bool                             locked = false;
4378         bool                             stripe = false;
4379         bool                             bad_oi = false;
4380         ENTRY;
4381
4382         if (!S_ISREG(lfsck_object_type(obj)))
4383                 GOTO(out, rc = 0);
4384
4385         if (lad->lad_assistant_status < 0)
4386                 GOTO(out, rc = -ESRCH);
4387
4388         fid_to_lmm_oi(lfsck_dto2fid(obj), oi);
4389         lmm_oi_cpu_to_le(oi, oi);
4390         dt_read_lock(env, obj, 0);
4391         locked = true;
4392
4393 again:
4394         if (dt_object_exists(obj) == 0 ||
4395             lfsck_is_dead_obj(obj))
4396                 GOTO(out, rc = 0);
4397
4398         rc = lfsck_layout_get_lovea(env, obj, buf);
4399         if (rc <= 0)
4400                 GOTO(out, rc);
4401
4402         size = rc;
4403         lmm = buf->lb_buf;
4404         rc = lfsck_layout_verify_header(lmm);
4405         /* If the LOV EA crashed, then it is possible to be rebuilt later
4406          * when handle orphan OST-objects. */
4407         if (rc != 0)
4408                 GOTO(out, rc);
4409
4410         if (memcmp(oi, &lmm->lmm_oi, sizeof(*oi)) == 0)
4411                 GOTO(out, stripe = true);
4412
4413         /* Inconsistent lmm_oi, should be repaired. */
4414         bad_oi = true;
4415         lmm->lmm_oi = *oi;
4416
4417         if (bk->lb_param & LPF_DRYRUN) {
4418                 lo->ll_objs_repaired[LLIT_OTHERS - 1]++;
4419
4420                 GOTO(out, stripe = true);
4421         }
4422
4423         if (!lustre_handle_is_used(&lh)) {
4424                 dt_read_unlock(env, obj);
4425                 locked = false;
4426                 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
4427                                       MDS_INODELOCK_LAYOUT |
4428                                       MDS_INODELOCK_XATTR, LCK_EX);
4429                 if (rc != 0)
4430                         GOTO(out, rc);
4431
4432                 handle = dt_trans_create(env, dev);
4433                 if (IS_ERR(handle))
4434                         GOTO(out, rc = PTR_ERR(handle));
4435
4436                 lfsck_buf_init(&ea_buf, lmm, size);
4437                 rc = dt_declare_xattr_set(env, obj, &ea_buf, XATTR_NAME_LOV,
4438                                           LU_XATTR_REPLACE, handle);
4439                 if (rc != 0)
4440                         GOTO(out, rc);
4441
4442                 rc = dt_trans_start_local(env, dev, handle);
4443                 if (rc != 0)
4444                         GOTO(out, rc);
4445
4446                 dt_write_lock(env, obj, 0);
4447                 locked = true;
4448
4449                 goto again;
4450         }
4451
4452         rc = dt_xattr_set(env, obj, &ea_buf, XATTR_NAME_LOV,
4453                           LU_XATTR_REPLACE, handle, BYPASS_CAPA);
4454         if (rc != 0)
4455                 GOTO(out, rc);
4456
4457         lo->ll_objs_repaired[LLIT_OTHERS - 1]++;
4458
4459         GOTO(out, stripe = true);
4460
4461 out:
4462         if (locked) {
4463                 if (lustre_handle_is_used(&lh))
4464                         dt_write_unlock(env, obj);
4465                 else
4466                         dt_read_unlock(env, obj);
4467         }
4468
4469         if (handle != NULL && !IS_ERR(handle))
4470                 dt_trans_stop(env, dev, handle);
4471
4472         lfsck_ibits_unlock(&lh, LCK_EX);
4473
4474         if (bad_oi)
4475                 CDEBUG(D_LFSCK, "%s: layout LFSCK master %s bad lmm_oi for "
4476                        DFID": rc = %d\n", lfsck_lfsck2name(lfsck),
4477                        bk->lb_param & LPF_DRYRUN ? "found" : "repaired",
4478                        PFID(lfsck_dto2fid(obj)), rc);
4479
4480         if (stripe) {
4481                 rc = lfsck_layout_scan_stripes(env, com, obj, lmm);
4482         } else {
4483                 down_write(&com->lc_sem);
4484                 com->lc_new_checked++;
4485                 if (rc < 0)
4486                         lfsck_layout_record_failure(env, lfsck, lo);
4487                 up_write(&com->lc_sem);
4488         }
4489
4490         return rc;
4491 }
4492
4493 static int lfsck_layout_slave_exec_oit(const struct lu_env *env,
4494                                        struct lfsck_component *com,
4495                                        struct dt_object *obj)
4496 {
4497         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4498         struct lfsck_layout             *lo     = com->lc_file_ram;
4499         const struct lu_fid             *fid    = lfsck_dto2fid(obj);
4500         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
4501         struct lfsck_layout_seq         *lls;
4502         __u64                            seq;
4503         __u64                            oid;
4504         int                              rc;
4505         ENTRY;
4506
4507         LASSERT(llsd != NULL);
4508
4509         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_DELAY5) &&
4510             cfs_fail_val == lfsck_dev_idx(lfsck->li_bottom)) {
4511                 struct l_wait_info       lwi = LWI_TIMEOUT(cfs_time_seconds(1),
4512                                                            NULL, NULL);
4513                 struct ptlrpc_thread    *thread = &lfsck->li_thread;
4514
4515                 l_wait_event(thread->t_ctl_waitq,
4516                              !thread_is_running(thread),
4517                              &lwi);
4518         }
4519
4520         lfsck_rbtree_update_bitmap(env, com, fid, false);
4521
4522         down_write(&com->lc_sem);
4523         if (fid_is_idif(fid))
4524                 seq = 0;
4525         else if (!fid_is_norm(fid) ||
4526                  !fid_is_for_ostobj(env, lfsck->li_next, obj, fid))
4527                 GOTO(unlock, rc = 0);
4528         else
4529                 seq = fid_seq(fid);
4530         com->lc_new_checked++;
4531
4532         lls = lfsck_layout_seq_lookup(llsd, seq);
4533         if (lls == NULL) {
4534                 OBD_ALLOC_PTR(lls);
4535                 if (unlikely(lls == NULL))
4536                         GOTO(unlock, rc = -ENOMEM);
4537
4538                 INIT_LIST_HEAD(&lls->lls_list);
4539                 lls->lls_seq = seq;
4540                 rc = lfsck_layout_lastid_load(env, com, lls);
4541                 if (rc != 0) {
4542                         CDEBUG(D_LFSCK, "%s: layout LFSCK failed to "
4543                               "load LAST_ID for "LPX64": rc = %d\n",
4544                               lfsck_lfsck2name(com->lc_lfsck), seq, rc);
4545                         lo->ll_objs_failed_phase1++;
4546                         OBD_FREE_PTR(lls);
4547                         GOTO(unlock, rc);
4548                 }
4549
4550                 lfsck_layout_seq_insert(llsd, lls);
4551         }
4552
4553         if (unlikely(fid_is_last_id(fid)))
4554                 GOTO(unlock, rc = 0);
4555
4556         if (fid_is_idif(fid))
4557                 oid = fid_idif_id(fid_seq(fid), fid_oid(fid), fid_ver(fid));
4558         else
4559                 oid = fid_oid(fid);
4560
4561         if (oid > lls->lls_lastid_known)
4562                 lls->lls_lastid_known = oid;
4563
4564         if (oid > lls->lls_lastid) {
4565                 if (!(lo->ll_flags & LF_CRASHED_LASTID)) {
4566                         /* OFD may create new objects during LFSCK scanning. */
4567                         rc = lfsck_layout_lastid_reload(env, com, lls);
4568                         if (unlikely(rc != 0)) {
4569                                 CDEBUG(D_LFSCK, "%s: layout LFSCK failed to "
4570                                       "reload LAST_ID for "LPX64": rc = %d\n",
4571                                       lfsck_lfsck2name(com->lc_lfsck),
4572                                       lls->lls_seq, rc);
4573
4574                                 GOTO(unlock, rc);
4575                         }
4576
4577                         if (oid <= lls->lls_lastid ||
4578                             lo->ll_flags & LF_CRASHED_LASTID)
4579                                 GOTO(unlock, rc = 0);
4580
4581                         LASSERT(lfsck->li_out_notify != NULL);
4582
4583                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
4584                                              LE_LASTID_REBUILDING);
4585                         lo->ll_flags |= LF_CRASHED_LASTID;
4586
4587                         CDEBUG(D_LFSCK, "%s: layout LFSCK finds crashed "
4588                                "LAST_ID file (2) for the sequence "LPX64
4589                                ", old value "LPU64", known value "LPU64"\n",
4590                                lfsck_lfsck2name(lfsck), lls->lls_seq,
4591                                lls->lls_lastid, oid);
4592                 }
4593
4594                 lls->lls_lastid = oid;
4595                 lls->lls_dirty = 1;
4596         }
4597
4598         GOTO(unlock, rc = 0);
4599
4600 unlock:
4601         up_write(&com->lc_sem);
4602
4603         return rc;
4604 }
4605
4606 static int lfsck_layout_exec_dir(const struct lu_env *env,
4607                                  struct lfsck_component *com,
4608                                  struct lu_dirent *ent, __u16 type)
4609 {
4610         return 0;
4611 }
4612
4613 static int lfsck_layout_master_post(const struct lu_env *env,
4614                                     struct lfsck_component *com,
4615                                     int result, bool init)
4616 {
4617         struct lfsck_instance   *lfsck  = com->lc_lfsck;
4618         struct lfsck_layout     *lo     = com->lc_file_ram;
4619         int                      rc;
4620         ENTRY;
4621
4622         lfsck_post_generic(env, com, &result);
4623
4624         down_write(&com->lc_sem);
4625         spin_lock(&lfsck->li_lock);
4626         if (!init)
4627                 lo->ll_pos_last_checkpoint =
4628                                 lfsck->li_pos_checkpoint.lp_oit_cookie;
4629
4630         if (result > 0) {
4631                 if (lo->ll_flags & LF_INCOMPLETE)
4632                         lo->ll_status = LS_PARTIAL;
4633                 else
4634                         lo->ll_status = LS_SCANNING_PHASE2;
4635                 lo->ll_flags |= LF_SCANNED_ONCE;
4636                 lo->ll_flags &= ~LF_UPGRADE;
4637                 list_move_tail(&com->lc_link, &lfsck->li_list_double_scan);
4638         } else if (result == 0) {
4639                 if (lfsck->li_status != 0)
4640                         lo->ll_status = lfsck->li_status;
4641                 else
4642                         lo->ll_status = LS_STOPPED;
4643                 if (lo->ll_status != LS_PAUSED)
4644                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4645         } else {
4646                 lo->ll_status = LS_FAILED;
4647                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4648         }
4649         spin_unlock(&lfsck->li_lock);
4650
4651         if (!init) {
4652                 lo->ll_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
4653                                 HALF_SEC - lfsck->li_time_last_checkpoint);
4654                 lo->ll_time_last_checkpoint = cfs_time_current_sec();
4655                 lo->ll_objs_checked_phase1 += com->lc_new_checked;
4656                 com->lc_new_checked = 0;
4657         }
4658
4659         rc = lfsck_layout_store(env, com);
4660         up_write(&com->lc_sem);
4661
4662         CDEBUG(D_LFSCK, "%s: layout LFSCK master post done: rc = %d\n",
4663                lfsck_lfsck2name(lfsck), rc);
4664
4665         RETURN(rc);
4666 }
4667
4668 static int lfsck_layout_slave_post(const struct lu_env *env,
4669                                    struct lfsck_component *com,
4670                                    int result, bool init)
4671 {
4672         struct lfsck_instance   *lfsck = com->lc_lfsck;
4673         struct lfsck_layout     *lo    = com->lc_file_ram;
4674         int                      rc;
4675         bool                     done  = false;
4676
4677         rc = lfsck_layout_lastid_store(env, com);
4678         if (rc != 0)
4679                 result = rc;
4680
4681         LASSERT(lfsck->li_out_notify != NULL);
4682
4683         down_write(&com->lc_sem);
4684         spin_lock(&lfsck->li_lock);
4685         if (!init)
4686                 lo->ll_pos_last_checkpoint =
4687                                 lfsck->li_pos_checkpoint.lp_oit_cookie;
4688
4689         if (result > 0) {
4690                 lo->ll_status = LS_SCANNING_PHASE2;
4691                 lo->ll_flags |= LF_SCANNED_ONCE;
4692                 if (lo->ll_flags & LF_CRASHED_LASTID) {
4693                         done = true;
4694                         lo->ll_flags &= ~LF_CRASHED_LASTID;
4695
4696                         CDEBUG(D_LFSCK, "%s: layout LFSCK has rebuilt "
4697                                "crashed LAST_ID files successfully\n",
4698                                lfsck_lfsck2name(lfsck));
4699                 }
4700                 lo->ll_flags &= ~LF_UPGRADE;
4701                 list_move_tail(&com->lc_link, &lfsck->li_list_double_scan);
4702         } else if (result == 0) {
4703                 if (lfsck->li_status != 0)
4704                         lo->ll_status = lfsck->li_status;
4705                 else
4706                         lo->ll_status = LS_STOPPED;
4707                 if (lo->ll_status != LS_PAUSED)
4708                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4709         } else {
4710                 lo->ll_status = LS_FAILED;
4711                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4712         }
4713         spin_unlock(&lfsck->li_lock);
4714
4715         if (done)
4716                 lfsck->li_out_notify(env, lfsck->li_out_notify_data,
4717                                      LE_LASTID_REBUILT);
4718
4719         if (!init) {
4720                 lo->ll_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
4721                                 HALF_SEC - lfsck->li_time_last_checkpoint);
4722                 lo->ll_time_last_checkpoint = cfs_time_current_sec();
4723                 lo->ll_objs_checked_phase1 += com->lc_new_checked;
4724                 com->lc_new_checked = 0;
4725         }
4726
4727         rc = lfsck_layout_store(env, com);
4728         up_write(&com->lc_sem);
4729
4730         lfsck_layout_slave_notify_master(env, com, LE_PHASE1_DONE, result);
4731
4732         CDEBUG(D_LFSCK, "%s: layout LFSCK slave post done: rc = %d\n",
4733                lfsck_lfsck2name(lfsck), rc);
4734
4735         return rc;
4736 }
4737
4738 static int lfsck_layout_dump(const struct lu_env *env,
4739                              struct lfsck_component *com, struct seq_file *m)
4740 {
4741         struct lfsck_instance   *lfsck = com->lc_lfsck;
4742         struct lfsck_bookmark   *bk    = &lfsck->li_bookmark_ram;
4743         struct lfsck_layout     *lo    = com->lc_file_ram;
4744         int                      rc;
4745
4746         down_read(&com->lc_sem);
4747         seq_printf(m, "name: lfsck_layout\n"
4748                       "magic: %#x\n"
4749                       "version: %d\n"
4750                       "status: %s\n",
4751                       lo->ll_magic,
4752                       bk->lb_version,
4753                       lfsck_status2names(lo->ll_status));
4754
4755         rc = lfsck_bits_dump(m, lo->ll_flags, lfsck_flags_names, "flags");
4756         if (rc < 0)
4757                 goto out;
4758
4759         rc = lfsck_bits_dump(m, bk->lb_param, lfsck_param_names, "param");
4760         if (rc < 0)
4761                 goto out;
4762
4763         rc = lfsck_time_dump(m, lo->ll_time_last_complete,
4764                              "time_since_last_completed");
4765         if (rc < 0)
4766                 goto out;
4767
4768         rc = lfsck_time_dump(m, lo->ll_time_latest_start,
4769                              "time_since_latest_start");
4770         if (rc < 0)
4771                 goto out;
4772
4773         rc = lfsck_time_dump(m, lo->ll_time_last_checkpoint,
4774                              "time_since_last_checkpoint");
4775         if (rc < 0)
4776                 goto out;
4777
4778         seq_printf(m, "latest_start_position: "LPU64"\n"
4779                       "last_checkpoint_position: "LPU64"\n"
4780                       "first_failure_position: "LPU64"\n",
4781                       lo->ll_pos_latest_start,
4782                       lo->ll_pos_last_checkpoint,
4783                       lo->ll_pos_first_inconsistent);
4784
4785         seq_printf(m, "success_count: %u\n"
4786                       "repaired_dangling: "LPU64"\n"
4787                       "repaired_unmatched_pair: "LPU64"\n"
4788                       "repaired_multiple_referenced: "LPU64"\n"
4789                       "repaired_orphan: "LPU64"\n"
4790                       "repaired_inconsistent_owner: "LPU64"\n"
4791                       "repaired_others: "LPU64"\n"
4792                       "skipped: "LPU64"\n"
4793                       "failed_phase1: "LPU64"\n"
4794                       "failed_phase2: "LPU64"\n",
4795                       lo->ll_success_count,
4796                       lo->ll_objs_repaired[LLIT_DANGLING - 1],
4797                       lo->ll_objs_repaired[LLIT_UNMATCHED_PAIR - 1],
4798                       lo->ll_objs_repaired[LLIT_MULTIPLE_REFERENCED - 1],
4799                       lo->ll_objs_repaired[LLIT_ORPHAN - 1],
4800                       lo->ll_objs_repaired[LLIT_INCONSISTENT_OWNER - 1],
4801                       lo->ll_objs_repaired[LLIT_OTHERS - 1],
4802                       lo->ll_objs_skipped,
4803                       lo->ll_objs_failed_phase1,
4804                       lo->ll_objs_failed_phase2);
4805
4806         if (lo->ll_status == LS_SCANNING_PHASE1) {
4807                 __u64 pos;
4808                 const struct dt_it_ops *iops;
4809                 cfs_duration_t duration = cfs_time_current() -
4810                                           lfsck->li_time_last_checkpoint;
4811                 __u64 checked = lo->ll_objs_checked_phase1 +
4812                                 com->lc_new_checked;
4813                 __u64 speed = checked;
4814                 __u64 new_checked = com->lc_new_checked *
4815                                     msecs_to_jiffies(MSEC_PER_SEC);
4816                 __u32 rtime = lo->ll_run_time_phase1 +
4817                               cfs_duration_sec(duration + HALF_SEC);
4818
4819                 if (duration != 0)
4820                         do_div(new_checked, duration);
4821                 if (rtime != 0)
4822                         do_div(speed, rtime);
4823                 seq_printf(m, "checked_phase1: "LPU64"\n"
4824                               "checked_phase2: "LPU64"\n"
4825                               "run_time_phase1: %u seconds\n"
4826                               "run_time_phase2: %u seconds\n"
4827                               "average_speed_phase1: "LPU64" items/sec\n"
4828                               "average_speed_phase2: N/A\n"
4829                               "real-time_speed_phase1: "LPU64" items/sec\n"
4830                               "real-time_speed_phase2: N/A\n",
4831                               checked,
4832                               lo->ll_objs_checked_phase2,
4833                               rtime,
4834                               lo->ll_run_time_phase2,
4835                               speed,
4836                               new_checked);
4837
4838                 LASSERT(lfsck->li_di_oit != NULL);
4839
4840                 iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
4841
4842                 /* The low layer otable-based iteration position may NOT
4843                  * exactly match the layout-based directory traversal
4844                  * cookie. Generally, it is not a serious issue. But the
4845                  * caller should NOT make assumption on that. */
4846                 pos = iops->store(env, lfsck->li_di_oit);
4847                 if (!lfsck->li_current_oit_processed)
4848                         pos--;
4849                 seq_printf(m, "current_position: "LPU64"\n", pos);
4850
4851         } else if (lo->ll_status == LS_SCANNING_PHASE2) {
4852                 cfs_duration_t duration = cfs_time_current() -
4853                                           lfsck->li_time_last_checkpoint;
4854                 __u64 checked = lo->ll_objs_checked_phase2 +
4855                                 com->lc_new_checked;
4856                 __u64 speed1 = lo->ll_objs_checked_phase1;
4857                 __u64 speed2 = checked;
4858                 __u64 new_checked = com->lc_new_checked *
4859                                     msecs_to_jiffies(MSEC_PER_SEC);
4860                 __u32 rtime = lo->ll_run_time_phase2 +
4861                               cfs_duration_sec(duration + HALF_SEC);
4862
4863                 if (duration != 0)
4864                         do_div(new_checked, duration);
4865                 if (lo->ll_run_time_phase1 != 0)
4866                         do_div(speed1, lo->ll_run_time_phase1);
4867                 if (rtime != 0)
4868                         do_div(speed2, rtime);
4869                 rc = seq_printf(m, "checked_phase1: "LPU64"\n"
4870                                 "checked_phase2: "LPU64"\n"
4871                                 "run_time_phase1: %u seconds\n"
4872                                 "run_time_phase2: %u seconds\n"
4873                                 "average_speed_phase1: "LPU64" items/sec\n"
4874                                 "average_speed_phase2: "LPU64" items/sec\n"
4875                                 "real-time_speed_phase1: N/A\n"
4876                                 "real-time_speed_phase2: "LPU64" items/sec\n"
4877                                 "current_position: "DFID"\n",
4878                                 lo->ll_objs_checked_phase1,
4879                                 checked,
4880                                 lo->ll_run_time_phase1,
4881                                 rtime,
4882                                 speed1,
4883                                 speed2,
4884                                 new_checked,
4885                                 PFID(&com->lc_fid_latest_scanned_phase2));
4886                 if (rc <= 0)
4887                         goto out;
4888
4889         } else {
4890                 __u64 speed1 = lo->ll_objs_checked_phase1;
4891                 __u64 speed2 = lo->ll_objs_checked_phase2;
4892
4893                 if (lo->ll_run_time_phase1 != 0)
4894                         do_div(speed1, lo->ll_run_time_phase1);
4895                 if (lo->ll_run_time_phase2 != 0)
4896                         do_div(speed2, lo->ll_run_time_phase2);
4897                 seq_printf(m, "checked_phase1: "LPU64"\n"
4898                            "checked_phase2: "LPU64"\n"
4899                            "run_time_phase1: %u seconds\n"
4900                            "run_time_phase2: %u seconds\n"
4901                            "average_speed_phase1: "LPU64" items/sec\n"
4902                            "average_speed_phase2: "LPU64" objs/sec\n"
4903                            "real-time_speed_phase1: N/A\n"
4904                            "real-time_speed_phase2: N/A\n"
4905                            "current_position: N/A\n",
4906                            lo->ll_objs_checked_phase1,
4907                            lo->ll_objs_checked_phase2,
4908                            lo->ll_run_time_phase1,
4909                            lo->ll_run_time_phase2,
4910                            speed1,
4911                            speed2);
4912         }
4913 out:
4914         up_read(&com->lc_sem);
4915
4916         return rc;
4917 }
4918
4919 static int lfsck_layout_master_double_scan(const struct lu_env *env,
4920                                            struct lfsck_component *com)
4921 {
4922         struct lfsck_layout             *lo     = com->lc_file_ram;
4923         struct lfsck_assistant_data     *lad    = com->lc_data;
4924         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4925         struct lfsck_tgt_descs          *ltds;
4926         struct lfsck_tgt_desc           *ltd;
4927         struct lfsck_tgt_desc           *next;
4928         int                              rc;
4929
4930         rc = lfsck_double_scan_generic(env, com, lo->ll_status);
4931
4932         if (thread_is_stopped(&lad->lad_thread)) {
4933                 LASSERT(list_empty(&lad->lad_req_list));
4934                 LASSERT(list_empty(&lad->lad_ost_phase1_list));
4935                 LASSERT(list_empty(&lad->lad_mdt_phase1_list));
4936
4937                 ltds = &lfsck->li_ost_descs;
4938                 spin_lock(&ltds->ltd_lock);
4939                 list_for_each_entry_safe(ltd, next, &lad->lad_ost_phase2_list,
4940                                          ltd_layout_phase_list) {
4941                         list_del_init(&ltd->ltd_layout_phase_list);
4942                 }
4943                 spin_unlock(&ltds->ltd_lock);
4944
4945                 ltds = &lfsck->li_mdt_descs;
4946                 spin_lock(&ltds->ltd_lock);
4947                 list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
4948                                          ltd_layout_phase_list) {
4949                         list_del_init(&ltd->ltd_layout_phase_list);
4950                 }
4951                 spin_unlock(&ltds->ltd_lock);
4952         }
4953
4954         return rc;
4955 }
4956
4957 static int lfsck_layout_slave_double_scan(const struct lu_env *env,
4958                                           struct lfsck_component *com)
4959 {
4960         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4961         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
4962         struct lfsck_layout             *lo     = com->lc_file_ram;
4963         struct ptlrpc_thread            *thread = &lfsck->li_thread;
4964         int                              rc;
4965         ENTRY;
4966
4967         CDEBUG(D_LFSCK, "%s: layout LFSCK slave phase2 scan start\n",
4968                lfsck_lfsck2name(lfsck));
4969
4970         if (lo->ll_flags & LF_INCOMPLETE)
4971                 GOTO(done, rc = 1);
4972
4973         atomic_inc(&lfsck->li_double_scan_count);
4974
4975         com->lc_new_checked = 0;
4976         com->lc_new_scanned = 0;
4977         com->lc_time_last_checkpoint = cfs_time_current();
4978         com->lc_time_next_checkpoint = com->lc_time_last_checkpoint +
4979                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
4980
4981         while (1) {
4982                 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(30),
4983                                                      NULL, NULL);
4984
4985                 rc = lfsck_layout_slave_query_master(env, com);
4986                 if (list_empty(&llsd->llsd_master_list)) {
4987                         if (unlikely(!thread_is_running(thread)))
4988                                 rc = 0;
4989                         else
4990                                 rc = 1;
4991
4992                         GOTO(done, rc);
4993                 }
4994
4995                 if (rc < 0)
4996                         GOTO(done, rc);
4997
4998                 rc = l_wait_event(thread->t_ctl_waitq,
4999                                   !thread_is_running(thread) ||
5000                                   list_empty(&llsd->llsd_master_list),
5001                                   &lwi);
5002                 if (unlikely(!thread_is_running(thread)))
5003                         GOTO(done, rc = 0);
5004
5005                 if (rc == -ETIMEDOUT)
5006                         continue;
5007
5008                 GOTO(done, rc = (rc < 0 ? rc : 1));
5009         }
5010
5011 done:
5012         rc = lfsck_layout_double_scan_result(env, com, rc);
5013         lfsck_layout_slave_notify_master(env, com, LE_PHASE2_DONE,
5014                         (rc > 0 && lo->ll_flags & LF_INCOMPLETE) ? 0 : rc);
5015         lfsck_layout_slave_quit(env, com);
5016         if (atomic_dec_and_test(&lfsck->li_double_scan_count))
5017                 wake_up_all(&lfsck->li_thread.t_ctl_waitq);
5018
5019         CDEBUG(D_LFSCK, "%s: layout LFSCK slave phase2 scan finished, "
5020                "status %d: rc = %d\n",
5021                lfsck_lfsck2name(lfsck), lo->ll_status, rc);
5022
5023         return rc;
5024 }
5025
5026 static void lfsck_layout_master_data_release(const struct lu_env *env,
5027                                              struct lfsck_component *com)
5028 {
5029         struct lfsck_assistant_data     *lad    = com->lc_data;
5030         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5031         struct lfsck_tgt_descs          *ltds;
5032         struct lfsck_tgt_desc           *ltd;
5033         struct lfsck_tgt_desc           *next;
5034
5035         LASSERT(lad != NULL);
5036         LASSERT(thread_is_init(&lad->lad_thread) ||
5037                 thread_is_stopped(&lad->lad_thread));
5038         LASSERT(list_empty(&lad->lad_req_list));
5039
5040         com->lc_data = NULL;
5041
5042         ltds = &lfsck->li_ost_descs;
5043         spin_lock(&ltds->ltd_lock);
5044         list_for_each_entry_safe(ltd, next, &lad->lad_ost_phase1_list,
5045                                  ltd_layout_phase_list) {
5046                 list_del_init(&ltd->ltd_layout_phase_list);
5047         }
5048         list_for_each_entry_safe(ltd, next, &lad->lad_ost_phase2_list,
5049                                  ltd_layout_phase_list) {
5050                 list_del_init(&ltd->ltd_layout_phase_list);
5051         }
5052         list_for_each_entry_safe(ltd, next, &lad->lad_ost_list,
5053                                  ltd_layout_list) {
5054                 list_del_init(&ltd->ltd_layout_list);
5055         }
5056         spin_unlock(&ltds->ltd_lock);
5057
5058         ltds = &lfsck->li_mdt_descs;
5059         spin_lock(&ltds->ltd_lock);
5060         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase1_list,
5061                                  ltd_layout_phase_list) {
5062                 list_del_init(&ltd->ltd_layout_phase_list);
5063         }
5064         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
5065                                  ltd_layout_phase_list) {
5066                 list_del_init(&ltd->ltd_layout_phase_list);
5067         }
5068         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_list,
5069                                  ltd_layout_list) {
5070                 list_del_init(&ltd->ltd_layout_list);
5071         }
5072         spin_unlock(&ltds->ltd_lock);
5073
5074         if (likely(lad->lad_bitmap != NULL))
5075                 CFS_FREE_BITMAP(lad->lad_bitmap);
5076
5077         OBD_FREE_PTR(lad);
5078 }
5079
5080 static void lfsck_layout_slave_data_release(const struct lu_env *env,
5081                                             struct lfsck_component *com)
5082 {
5083         struct lfsck_layout_slave_data *llsd = com->lc_data;
5084
5085         lfsck_layout_slave_quit(env, com);
5086         com->lc_data = NULL;
5087         OBD_FREE_PTR(llsd);
5088 }
5089
5090 static void lfsck_layout_master_quit(const struct lu_env *env,
5091                                      struct lfsck_component *com)
5092 {
5093         struct lfsck_assistant_data     *lad    = com->lc_data;
5094         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5095         struct lfsck_tgt_descs          *ltds;
5096         struct lfsck_tgt_desc           *ltd;
5097         struct lfsck_tgt_desc           *next;
5098
5099         LASSERT(lad != NULL);
5100
5101         lfsck_quit_generic(env, com);
5102
5103         LASSERT(thread_is_init(&lad->lad_thread) ||
5104                 thread_is_stopped(&lad->lad_thread));
5105         LASSERT(list_empty(&lad->lad_req_list));
5106
5107         ltds = &lfsck->li_ost_descs;
5108         spin_lock(&ltds->ltd_lock);
5109         list_for_each_entry_safe(ltd, next, &lad->lad_ost_phase1_list,
5110                                  ltd_layout_phase_list) {
5111                 list_del_init(&ltd->ltd_layout_phase_list);
5112         }
5113         list_for_each_entry_safe(ltd, next, &lad->lad_ost_phase2_list,
5114                                  ltd_layout_phase_list) {
5115                 list_del_init(&ltd->ltd_layout_phase_list);
5116         }
5117         spin_unlock(&ltds->ltd_lock);
5118
5119         ltds = &lfsck->li_mdt_descs;
5120         spin_lock(&ltds->ltd_lock);
5121         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase1_list,
5122                                  ltd_layout_phase_list) {
5123                 list_del_init(&ltd->ltd_layout_phase_list);
5124         }
5125         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
5126                                  ltd_layout_phase_list) {
5127                 list_del_init(&ltd->ltd_layout_phase_list);
5128         }
5129         spin_unlock(&ltds->ltd_lock);
5130 }
5131
5132 static void lfsck_layout_slave_quit(const struct lu_env *env,
5133                                     struct lfsck_component *com)
5134 {
5135         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
5136         struct lfsck_layout_seq          *lls;
5137         struct lfsck_layout_seq          *next;
5138         struct lfsck_layout_slave_target *llst;
5139
5140         LASSERT(llsd != NULL);
5141
5142         list_for_each_entry_safe(lls, next, &llsd->llsd_seq_list,
5143                                  lls_list) {
5144                 list_del_init(&lls->lls_list);
5145                 lfsck_object_put(env, lls->lls_lastid_obj);
5146                 OBD_FREE_PTR(lls);
5147         }
5148
5149         spin_lock(&llsd->llsd_lock);
5150         while (!list_empty(&llsd->llsd_master_list)) {
5151                 llst = list_entry(llsd->llsd_master_list.next,
5152                                   struct lfsck_layout_slave_target, llst_list);
5153                 list_del_init(&llst->llst_list);
5154                 spin_unlock(&llsd->llsd_lock);
5155                 lfsck_layout_llst_put(llst);
5156         }
5157         spin_unlock(&llsd->llsd_lock);
5158
5159         lfsck_rbtree_cleanup(env, com);
5160 }
5161
5162 static int lfsck_layout_master_in_notify(const struct lu_env *env,
5163                                          struct lfsck_component *com,
5164                                          struct lfsck_request *lr,
5165                                          struct thandle *th)
5166 {
5167         struct lfsck_instance           *lfsck = com->lc_lfsck;
5168         struct lfsck_layout             *lo    = com->lc_file_ram;
5169         struct lfsck_assistant_data     *lad   = com->lc_data;
5170         struct lfsck_tgt_descs          *ltds;
5171         struct lfsck_tgt_desc           *ltd;
5172         bool                             fail  = false;
5173         ENTRY;
5174
5175         if (lr->lr_event == LE_PAIRS_VERIFY) {
5176                 int rc;
5177
5178                 rc = lfsck_layout_master_check_pairs(env, com, &lr->lr_fid,
5179                                                      &lr->lr_fid2);
5180
5181                 RETURN(rc);
5182         }
5183
5184         CDEBUG(D_LFSCK, "%s: layout LFSCK master handles notify %u "
5185                "from %s %x, status %d, flags %x, flags2 %x\n",
5186                lfsck_lfsck2name(lfsck), lr->lr_event,
5187                (lr->lr_flags & LEF_TO_OST) ? "OST" : "MDT",
5188                lr->lr_index, lr->lr_status, lr->lr_flags, lr->lr_flags2);
5189
5190         if (lr->lr_event != LE_PHASE1_DONE &&
5191             lr->lr_event != LE_PHASE2_DONE &&
5192             lr->lr_event != LE_PEER_EXIT)
5193                 RETURN(-EINVAL);
5194
5195         if (lr->lr_flags & LEF_FROM_OST)
5196                 ltds = &lfsck->li_ost_descs;
5197         else
5198                 ltds = &lfsck->li_mdt_descs;
5199         spin_lock(&ltds->ltd_lock);
5200         ltd = LTD_TGT(ltds, lr->lr_index);
5201         if (ltd == NULL) {
5202                 spin_unlock(&ltds->ltd_lock);
5203
5204                 RETURN(-ENXIO);
5205         }
5206
5207         list_del_init(&ltd->ltd_layout_phase_list);
5208         switch (lr->lr_event) {
5209         case LE_PHASE1_DONE:
5210                 if (lr->lr_status <= 0 || lr->lr_flags2 & LF_INCOMPLETE) {
5211                         if (lr->lr_flags2 & LF_INCOMPLETE) {
5212                                 if (lr->lr_flags & LEF_FROM_OST)
5213                                         lfsck_lad_set_bitmap(env, com,
5214                                                              ltd->ltd_index);
5215                                 else
5216                                         lo->ll_flags |= LF_INCOMPLETE;
5217                         }
5218                         ltd->ltd_layout_done = 1;
5219                         list_del_init(&ltd->ltd_layout_list);
5220                         fail = true;
5221                         break;
5222                 }
5223
5224                 if (lr->lr_flags & LEF_FROM_OST) {
5225                         if (list_empty(&ltd->ltd_layout_list))
5226                                 list_add_tail(&ltd->ltd_layout_list,
5227                                               &lad->lad_ost_list);
5228                         list_add_tail(&ltd->ltd_layout_phase_list,
5229                                       &lad->lad_ost_phase2_list);
5230                 } else {
5231                         if (list_empty(&ltd->ltd_layout_list))
5232                                 list_add_tail(&ltd->ltd_layout_list,
5233                                               &lad->lad_mdt_list);
5234                         list_add_tail(&ltd->ltd_layout_phase_list,
5235                                       &lad->lad_mdt_phase2_list);
5236                 }
5237                 break;
5238         case LE_PHASE2_DONE:
5239                 ltd->ltd_layout_done = 1;
5240                 list_del_init(&ltd->ltd_layout_list);
5241                 break;
5242         case LE_PEER_EXIT:
5243                 fail = true;
5244                 ltd->ltd_layout_done = 1;
5245                 list_del_init(&ltd->ltd_layout_list);
5246                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT) &&
5247                     !(lr->lr_flags & LEF_FROM_OST))
5248                                 lo->ll_flags |= LF_INCOMPLETE;
5249                 break;
5250         default:
5251                 break;
5252         }
5253         spin_unlock(&ltds->ltd_lock);
5254
5255         if (fail && lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT) {
5256                 struct lfsck_stop *stop = &lfsck_env_info(env)->lti_stop;
5257
5258                 memset(stop, 0, sizeof(*stop));
5259                 stop->ls_status = lr->lr_status;
5260                 stop->ls_flags = lr->lr_param & ~LPF_BROADCAST;
5261                 lfsck_stop(env, lfsck->li_bottom, stop);
5262         } else if (lfsck_phase2_next_ready(lad)) {
5263                 wake_up_all(&lad->lad_thread.t_ctl_waitq);
5264         }
5265
5266         RETURN(0);
5267 }
5268
5269 static int lfsck_layout_slave_in_notify(const struct lu_env *env,
5270                                         struct lfsck_component *com,
5271                                         struct lfsck_request *lr,
5272                                         struct thandle *th)
5273 {
5274         struct lfsck_instance            *lfsck = com->lc_lfsck;
5275         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
5276         struct lfsck_layout_slave_target *llst;
5277         int                               rc;
5278         ENTRY;
5279
5280         switch (lr->lr_event) {
5281         case LE_FID_ACCESSED:
5282                 lfsck_rbtree_update_bitmap(env, com, &lr->lr_fid, true);
5283                 RETURN(0);
5284         case LE_CONDITIONAL_DESTROY:
5285                 rc = lfsck_layout_slave_conditional_destroy(env, com, lr);
5286                 RETURN(rc);
5287         case LE_PAIRS_VERIFY: {
5288                 lr->lr_status = LPVS_INIT;
5289                 /* Firstly, if the MDT-object which is claimed via OST-object
5290                  * local stored PFID xattr recognizes the OST-object, then it
5291                  * must be that the client given PFID is wrong. */
5292                 rc = lfsck_layout_slave_check_pairs(env, com, &lr->lr_fid,
5293                                                     &lr->lr_fid3);
5294                 if (rc <= 0)
5295                         RETURN(0);
5296
5297                 lr->lr_status = LPVS_INCONSISTENT;
5298                 /* The OST-object local stored PFID xattr is stale. We need to
5299                  * check whether the MDT-object that is claimed via the client
5300                  * given PFID information recognizes the OST-object or not. If
5301                  * matches, then need to update the OST-object's PFID xattr. */
5302                 rc = lfsck_layout_slave_check_pairs(env, com, &lr->lr_fid,
5303                                                     &lr->lr_fid2);
5304                 /* For rc < 0 case:
5305                  * We are not sure whether the client given PFID information
5306                  * is correct or not, do nothing to avoid improper fixing.
5307                  *
5308                  * For rc > 0 case:
5309                  * The client given PFID information is also invalid, we can
5310                  * NOT fix the OST-object inconsistency.
5311                  */
5312                 if (rc != 0)
5313                         RETURN(rc);
5314
5315                 lr->lr_status = LPVS_INCONSISTENT_TOFIX;
5316                 rc = lfsck_layout_slave_repair_pfid(env, com, lr);
5317
5318                 RETURN(rc);
5319         }
5320         case LE_PHASE1_DONE: {
5321                 if (lr->lr_flags2 & LF_INCOMPLETE) {
5322                         struct lfsck_layout *lo = com->lc_file_ram;
5323
5324                         lo->ll_flags |= LF_INCOMPLETE;
5325                         llst = lfsck_layout_llst_find_and_del(llsd,
5326                                                               lr->lr_index,
5327                                                               true);
5328                         if (llst != NULL) {
5329                                 lfsck_layout_llst_put(llst);
5330                                 if (list_empty(&llsd->llsd_master_list))
5331                                         wake_up_all(
5332                                                 &lfsck->li_thread.t_ctl_waitq);
5333                         }
5334                 }
5335
5336                 RETURN(0);
5337         }
5338         case LE_PHASE2_DONE:
5339         case LE_PEER_EXIT:
5340                 CDEBUG(D_LFSCK, "%s: layout LFSCK slave handle notify %u "
5341                        "from MDT %x, status %d\n", lfsck_lfsck2name(lfsck),
5342                        lr->lr_event, lr->lr_index, lr->lr_status);
5343                 break;
5344         default:
5345                 RETURN(-EINVAL);
5346         }
5347
5348         llst = lfsck_layout_llst_find_and_del(llsd, lr->lr_index, true);
5349         if (llst == NULL)
5350                 RETURN(0);
5351
5352         lfsck_layout_llst_put(llst);
5353         if (list_empty(&llsd->llsd_master_list))
5354                 wake_up_all(&lfsck->li_thread.t_ctl_waitq);
5355
5356         if (lr->lr_event == LE_PEER_EXIT &&
5357             (lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT ||
5358              (list_empty(&llsd->llsd_master_list) &&
5359               (lr->lr_status == LS_STOPPED ||
5360                lr->lr_status == LS_CO_STOPPED)))) {
5361                 struct lfsck_stop *stop = &lfsck_env_info(env)->lti_stop;
5362
5363                 memset(stop, 0, sizeof(*stop));
5364                 stop->ls_status = lr->lr_status;
5365                 stop->ls_flags = lr->lr_param & ~LPF_BROADCAST;
5366                 lfsck_stop(env, lfsck->li_bottom, stop);
5367         }
5368
5369         RETURN(0);
5370 }
5371
5372 static int lfsck_layout_query(const struct lu_env *env,
5373                               struct lfsck_component *com)
5374 {
5375         struct lfsck_layout *lo = com->lc_file_ram;
5376
5377         return lo->ll_status;
5378 }
5379
5380 /* with lfsck::li_lock held */
5381 static int lfsck_layout_slave_join(const struct lu_env *env,
5382                                    struct lfsck_component *com,
5383                                    struct lfsck_start_param *lsp)
5384 {
5385         struct lfsck_instance            *lfsck = com->lc_lfsck;
5386         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
5387         struct lfsck_layout_slave_target *llst;
5388         struct lfsck_start               *start = lsp->lsp_start;
5389         int                               rc    = 0;
5390         ENTRY;
5391
5392         if (start == NULL || !(start->ls_flags & LPF_OST_ORPHAN))
5393                 RETURN(0);
5394
5395         if (!lsp->lsp_index_valid)
5396                 RETURN(-EINVAL);
5397
5398         /* If someone is running the LFSCK without orphan handling,
5399          * it will not maintain the object accessing rbtree. So we
5400          * cannot join it for orphan handling. */
5401         if (!llsd->llsd_rbtree_valid)
5402                 RETURN(-EBUSY);
5403
5404         spin_unlock(&lfsck->li_lock);
5405         rc = lfsck_layout_llst_add(llsd, lsp->lsp_index);
5406         spin_lock(&lfsck->li_lock);
5407         if (rc == 0 && !thread_is_running(&lfsck->li_thread)) {
5408                 spin_unlock(&lfsck->li_lock);
5409                 llst = lfsck_layout_llst_find_and_del(llsd, lsp->lsp_index,
5410                                                       true);
5411                 if (llst != NULL)
5412                         lfsck_layout_llst_put(llst);
5413                 spin_lock(&lfsck->li_lock);
5414                 rc = -EAGAIN;
5415         }
5416
5417         RETURN(rc);
5418 }
5419
5420 static struct lfsck_operations lfsck_layout_master_ops = {
5421         .lfsck_reset            = lfsck_layout_reset,
5422         .lfsck_fail             = lfsck_layout_fail,
5423         .lfsck_checkpoint       = lfsck_layout_master_checkpoint,
5424         .lfsck_prep             = lfsck_layout_master_prep,
5425         .lfsck_exec_oit         = lfsck_layout_master_exec_oit,
5426         .lfsck_exec_dir         = lfsck_layout_exec_dir,
5427         .lfsck_post             = lfsck_layout_master_post,
5428         .lfsck_dump             = lfsck_layout_dump,
5429         .lfsck_double_scan      = lfsck_layout_master_double_scan,
5430         .lfsck_data_release     = lfsck_layout_master_data_release,
5431         .lfsck_quit             = lfsck_layout_master_quit,
5432         .lfsck_in_notify        = lfsck_layout_master_in_notify,
5433         .lfsck_query            = lfsck_layout_query,
5434 };
5435
5436 static struct lfsck_operations lfsck_layout_slave_ops = {
5437         .lfsck_reset            = lfsck_layout_reset,
5438         .lfsck_fail             = lfsck_layout_fail,
5439         .lfsck_checkpoint       = lfsck_layout_slave_checkpoint,
5440         .lfsck_prep             = lfsck_layout_slave_prep,
5441         .lfsck_exec_oit         = lfsck_layout_slave_exec_oit,
5442         .lfsck_exec_dir         = lfsck_layout_exec_dir,
5443         .lfsck_post             = lfsck_layout_slave_post,
5444         .lfsck_dump             = lfsck_layout_dump,
5445         .lfsck_double_scan      = lfsck_layout_slave_double_scan,
5446         .lfsck_data_release     = lfsck_layout_slave_data_release,
5447         .lfsck_quit             = lfsck_layout_slave_quit,
5448         .lfsck_in_notify        = lfsck_layout_slave_in_notify,
5449         .lfsck_query            = lfsck_layout_query,
5450         .lfsck_join             = lfsck_layout_slave_join,
5451 };
5452
5453 static void lfsck_layout_assistant_fill_pos(const struct lu_env *env,
5454                                             struct lfsck_component *com,
5455                                             struct lfsck_position *pos)
5456 {
5457         struct lfsck_assistant_data     *lad = com->lc_data;
5458         struct lfsck_layout_req         *llr;
5459
5460         if (list_empty(&lad->lad_req_list))
5461                 return;
5462
5463         llr = list_entry(lad->lad_req_list.next,
5464                          struct lfsck_layout_req,
5465                          llr_lar.lar_list);
5466         pos->lp_oit_cookie = llr->llr_parent->llo_cookie - 1;
5467 }
5468
5469 struct lfsck_assistant_operations lfsck_layout_assistant_ops = {
5470         .la_handler_p1          = lfsck_layout_assistant_handler_p1,
5471         .la_handler_p2          = lfsck_layout_assistant_handler_p2,
5472         .la_fill_pos            = lfsck_layout_assistant_fill_pos,
5473         .la_double_scan_result  = lfsck_layout_double_scan_result,
5474         .la_req_fini            = lfsck_layout_assistant_req_fini,
5475         .la_sync_failures       = lfsck_layout_assistant_sync_failures,
5476 };
5477
5478 int lfsck_layout_setup(const struct lu_env *env, struct lfsck_instance *lfsck)
5479 {
5480         struct lfsck_component  *com;
5481         struct lfsck_layout     *lo;
5482         struct dt_object        *root = NULL;
5483         struct dt_object        *obj;
5484         int                      rc;
5485         ENTRY;
5486
5487         OBD_ALLOC_PTR(com);
5488         if (com == NULL)
5489                 RETURN(-ENOMEM);
5490
5491         INIT_LIST_HEAD(&com->lc_link);
5492         INIT_LIST_HEAD(&com->lc_link_dir);
5493         init_rwsem(&com->lc_sem);
5494         atomic_set(&com->lc_ref, 1);
5495         com->lc_lfsck = lfsck;
5496         com->lc_type = LFSCK_TYPE_LAYOUT;
5497         if (lfsck->li_master) {
5498                 com->lc_ops = &lfsck_layout_master_ops;
5499                 com->lc_data = lfsck_assistant_data_init(
5500                                 &lfsck_layout_assistant_ops,
5501                                 LFSCK_LAYOUT);
5502                 if (com->lc_data == NULL)
5503                         GOTO(out, rc = -ENOMEM);
5504         } else {
5505                 struct lfsck_layout_slave_data *llsd;
5506
5507                 com->lc_ops = &lfsck_layout_slave_ops;
5508                 OBD_ALLOC_PTR(llsd);
5509                 if (llsd == NULL)
5510                         GOTO(out, rc = -ENOMEM);
5511
5512                 INIT_LIST_HEAD(&llsd->llsd_seq_list);
5513                 INIT_LIST_HEAD(&llsd->llsd_master_list);
5514                 spin_lock_init(&llsd->llsd_lock);
5515                 llsd->llsd_rb_root = RB_ROOT;
5516                 rwlock_init(&llsd->llsd_rb_lock);
5517                 com->lc_data = llsd;
5518         }
5519         com->lc_file_size = sizeof(*lo);
5520         OBD_ALLOC(com->lc_file_ram, com->lc_file_size);
5521         if (com->lc_file_ram == NULL)
5522                 GOTO(out, rc = -ENOMEM);
5523
5524         OBD_ALLOC(com->lc_file_disk, com->lc_file_size);
5525         if (com->lc_file_disk == NULL)
5526                 GOTO(out, rc = -ENOMEM);
5527
5528         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
5529         if (IS_ERR(root))
5530                 GOTO(out, rc = PTR_ERR(root));
5531
5532         if (unlikely(!dt_try_as_dir(env, root)))
5533                 GOTO(out, rc = -ENOTDIR);
5534
5535         obj = local_file_find_or_create(env, lfsck->li_los, root,
5536                                         LFSCK_LAYOUT,
5537                                         S_IFREG | S_IRUGO | S_IWUSR);
5538         if (IS_ERR(obj))
5539                 GOTO(out, rc = PTR_ERR(obj));
5540
5541         com->lc_obj = obj;
5542         rc = lfsck_layout_load(env, com);
5543         if (rc > 0)
5544                 rc = lfsck_layout_reset(env, com, true);
5545         else if (rc == -ENOENT)
5546                 rc = lfsck_layout_init(env, com);
5547
5548         if (rc != 0)
5549                 GOTO(out, rc);
5550
5551         lo = com->lc_file_ram;
5552         switch (lo->ll_status) {
5553         case LS_INIT:
5554         case LS_COMPLETED:
5555         case LS_FAILED:
5556         case LS_STOPPED:
5557         case LS_PARTIAL:
5558                 spin_lock(&lfsck->li_lock);
5559                 list_add_tail(&com->lc_link, &lfsck->li_list_idle);
5560                 spin_unlock(&lfsck->li_lock);
5561                 break;
5562         default:
5563                 CERROR("%s: unknown lfsck_layout status %d\n",
5564                        lfsck_lfsck2name(lfsck), lo->ll_status);
5565                 /* fall through */
5566         case LS_SCANNING_PHASE1:
5567         case LS_SCANNING_PHASE2:
5568                 /* No need to store the status to disk right now.
5569                  * If the system crashed before the status stored,
5570                  * it will be loaded back when next time. */
5571                 lo->ll_status = LS_CRASHED;
5572                 if (!lfsck->li_master)
5573                         lo->ll_flags |= LF_INCOMPLETE;
5574                 /* fall through */
5575         case LS_PAUSED:
5576         case LS_CRASHED:
5577         case LS_CO_FAILED:
5578         case LS_CO_STOPPED:
5579         case LS_CO_PAUSED:
5580                 spin_lock(&lfsck->li_lock);
5581                 list_add_tail(&com->lc_link, &lfsck->li_list_scan);
5582                 spin_unlock(&lfsck->li_lock);
5583                 break;
5584         }
5585
5586         if (lo->ll_flags & LF_CRASHED_LASTID) {
5587                 LASSERT(lfsck->li_out_notify != NULL);
5588
5589                 lfsck->li_out_notify(env, lfsck->li_out_notify_data,
5590                                      LE_LASTID_REBUILDING);
5591         }
5592
5593         GOTO(out, rc = 0);
5594
5595 out:
5596         if (root != NULL && !IS_ERR(root))
5597                 lu_object_put(env, &root->do_lu);
5598
5599         if (rc != 0) {
5600                 lfsck_component_cleanup(env, com);
5601                 CERROR("%s: fail to init layout LFSCK component: rc = %d\n",
5602                        lfsck_lfsck2name(lfsck), rc);
5603         }
5604
5605         return rc;
5606 }
5607
5608 struct lfsck_orphan_it {
5609         struct lfsck_component           *loi_com;
5610         struct lfsck_rbtree_node         *loi_lrn;
5611         struct lfsck_layout_slave_target *loi_llst;
5612         struct lu_fid                     loi_key;
5613         struct lu_orphan_rec              loi_rec;
5614         __u64                             loi_hash;
5615         unsigned int                      loi_over:1;
5616 };
5617
5618 static int lfsck_fid_match_idx(const struct lu_env *env,
5619                                struct lfsck_instance *lfsck,
5620                                const struct lu_fid *fid, int idx)
5621 {
5622         struct seq_server_site  *ss;
5623         struct lu_server_fld    *sf;
5624         struct lu_seq_range     *range = &lfsck_env_info(env)->lti_range;
5625         int                      rc;
5626
5627         /* All abnormal cases will be returned to MDT0. */
5628         if (!fid_is_norm(fid)) {
5629                 if (idx == 0)
5630                         return 1;
5631
5632                 return 0;
5633         }
5634
5635         ss = lu_site2seq(lfsck->li_bottom->dd_lu_dev.ld_site);
5636         if (unlikely(ss == NULL))
5637                 return -ENOTCONN;
5638
5639         sf = ss->ss_server_fld;
5640         LASSERT(sf != NULL);
5641
5642         fld_range_set_any(range);
5643         rc = fld_server_lookup(env, sf, fid_seq(fid), range);
5644         if (rc != 0)
5645                 return rc;
5646
5647         if (!fld_range_is_mdt(range))
5648                 return -EINVAL;
5649
5650         if (range->lsr_index == idx)
5651                 return 1;
5652
5653         return 0;
5654 }
5655
5656 static void lfsck_layout_destroy_orphan(const struct lu_env *env,
5657                                         struct dt_device *dev,
5658                                         struct dt_object *obj)
5659 {
5660         struct thandle *handle;
5661         int             rc;
5662         ENTRY;
5663
5664         handle = dt_trans_create(env, dev);
5665         if (IS_ERR(handle))
5666                 RETURN_EXIT;
5667
5668         rc = dt_declare_ref_del(env, obj, handle);
5669         if (rc != 0)
5670                 GOTO(stop, rc);
5671
5672         rc = dt_declare_destroy(env, obj, handle);
5673         if (rc != 0)
5674                 GOTO(stop, rc);
5675
5676         rc = dt_trans_start_local(env, dev, handle);
5677         if (rc != 0)
5678                 GOTO(stop, rc);
5679
5680         dt_write_lock(env, obj, 0);
5681         rc = dt_ref_del(env, obj, handle);
5682         if (rc == 0)
5683                 rc = dt_destroy(env, obj, handle);
5684         dt_write_unlock(env, obj);
5685
5686         GOTO(stop, rc);
5687
5688 stop:
5689         dt_trans_stop(env, dev, handle);
5690
5691         CDEBUG(D_LFSCK, "destroy orphan OST-object "DFID": rc = %d\n",
5692                PFID(lfsck_dto2fid(obj)), rc);
5693
5694         RETURN_EXIT;
5695 }
5696
5697 static int lfsck_orphan_index_lookup(const struct lu_env *env,
5698                                      struct dt_object *dt,
5699                                      struct dt_rec *rec,
5700                                      const struct dt_key *key,
5701                                      struct lustre_capa *capa)
5702 {
5703         return -EOPNOTSUPP;
5704 }
5705
5706 static int lfsck_orphan_index_declare_insert(const struct lu_env *env,
5707                                              struct dt_object *dt,
5708                                              const struct dt_rec *rec,
5709                                              const struct dt_key *key,
5710                                              struct thandle *handle)
5711 {
5712         return -EOPNOTSUPP;
5713 }
5714
5715 static int lfsck_orphan_index_insert(const struct lu_env *env,
5716                                      struct dt_object *dt,
5717                                      const struct dt_rec *rec,
5718                                      const struct dt_key *key,
5719                                      struct thandle *handle,
5720                                      struct lustre_capa *capa,
5721                                      int ignore_quota)
5722 {
5723         return -EOPNOTSUPP;
5724 }
5725
5726 static int lfsck_orphan_index_declare_delete(const struct lu_env *env,
5727                                              struct dt_object *dt,
5728                                              const struct dt_key *key,
5729                                              struct thandle *handle)
5730 {
5731         return -EOPNOTSUPP;
5732 }
5733
5734 static int lfsck_orphan_index_delete(const struct lu_env *env,
5735                                      struct dt_object *dt,
5736                                      const struct dt_key *key,
5737                                      struct thandle *handle,
5738                                      struct lustre_capa *capa)
5739 {
5740         return -EOPNOTSUPP;
5741 }
5742
5743 static struct dt_it *lfsck_orphan_it_init(const struct lu_env *env,
5744                                           struct dt_object *dt,
5745                                           __u32 attr,
5746                                           struct lustre_capa *capa)
5747 {
5748         struct dt_device                *dev    = lu2dt_dev(dt->do_lu.lo_dev);
5749         struct lfsck_instance           *lfsck;
5750         struct lfsck_component          *com    = NULL;
5751         struct lfsck_layout_slave_data  *llsd;
5752         struct lfsck_orphan_it          *it     = NULL;
5753         struct lfsck_layout             *lo;
5754         int                              rc     = 0;
5755         ENTRY;
5756
5757         lfsck = lfsck_instance_find(dev, true, false);
5758         if (unlikely(lfsck == NULL))
5759                 RETURN(ERR_PTR(-ENXIO));
5760
5761         com = lfsck_component_find(lfsck, LFSCK_TYPE_LAYOUT);
5762         if (unlikely(com == NULL))
5763                 GOTO(out, rc = -ENOENT);
5764
5765         lo = com->lc_file_ram;
5766         if (lo->ll_flags & LF_INCOMPLETE)
5767                 GOTO(out, rc = -ESRCH);
5768
5769         llsd = com->lc_data;
5770         if (!llsd->llsd_rbtree_valid)
5771                 GOTO(out, rc = -ESRCH);
5772
5773         OBD_ALLOC_PTR(it);
5774         if (it == NULL)
5775                 GOTO(out, rc = -ENOMEM);
5776
5777         it->loi_llst = lfsck_layout_llst_find_and_del(llsd, attr, false);
5778         if (it->loi_llst == NULL)
5779                 GOTO(out, rc = -ENXIO);
5780
5781         if (dev->dd_record_fid_accessed) {
5782                 /* The first iteration against the rbtree, scan the whole rbtree
5783                  * to remove the nodes which do NOT need to be handled. */
5784                 write_lock(&llsd->llsd_rb_lock);
5785                 if (dev->dd_record_fid_accessed) {
5786                         struct rb_node                  *node;
5787                         struct rb_node                  *next;
5788                         struct lfsck_rbtree_node        *lrn;
5789
5790                         /* No need to record the fid accessing anymore. */
5791                         dev->dd_record_fid_accessed = 0;
5792
5793                         node = rb_first(&llsd->llsd_rb_root);
5794                         while (node != NULL) {
5795                                 next = rb_next(node);
5796                                 lrn = rb_entry(node, struct lfsck_rbtree_node,
5797                                                lrn_node);
5798                                 if (atomic_read(&lrn->lrn_known_count) <=
5799                                     atomic_read(&lrn->lrn_accessed_count)) {
5800                                         rb_erase(node, &llsd->llsd_rb_root);
5801                                         lfsck_rbtree_free(lrn);
5802                                 }
5803                                 node = next;
5804                         }
5805                 }
5806                 write_unlock(&llsd->llsd_rb_lock);
5807         }
5808
5809         /* read lock the rbtree when init, and unlock when fini */
5810         read_lock(&llsd->llsd_rb_lock);
5811         it->loi_com = com;
5812         com = NULL;
5813
5814         GOTO(out, rc = 0);
5815
5816 out:
5817         if (com != NULL)
5818                 lfsck_component_put(env, com);
5819
5820         CDEBUG(D_LFSCK, "%s: init the orphan iteration: rc = %d\n",
5821                lfsck_lfsck2name(lfsck), rc);
5822
5823         lfsck_instance_put(env, lfsck);
5824         if (rc != 0) {
5825                 if (it != NULL)
5826                         OBD_FREE_PTR(it);
5827
5828                 it = (struct lfsck_orphan_it *)ERR_PTR(rc);
5829         }
5830
5831         return (struct dt_it *)it;
5832 }
5833
5834 static void lfsck_orphan_it_fini(const struct lu_env *env,
5835                                  struct dt_it *di)
5836 {
5837         struct lfsck_orphan_it           *it    = (struct lfsck_orphan_it *)di;
5838         struct lfsck_component           *com   = it->loi_com;
5839         struct lfsck_layout_slave_data   *llsd;
5840         struct lfsck_layout_slave_target *llst;
5841
5842         if (com != NULL) {
5843                 CDEBUG(D_LFSCK, "%s: fini the orphan iteration\n",
5844                        lfsck_lfsck2name(com->lc_lfsck));
5845
5846                 llsd = com->lc_data;
5847                 read_unlock(&llsd->llsd_rb_lock);
5848                 llst = it->loi_llst;
5849                 LASSERT(llst != NULL);
5850
5851                 /* Save the key and hash for iterate next. */
5852                 llst->llst_fid = it->loi_key;
5853                 llst->llst_hash = it->loi_hash;
5854                 lfsck_layout_llst_put(llst);
5855                 lfsck_component_put(env, com);
5856         }
5857         OBD_FREE_PTR(it);
5858 }
5859
5860 /**
5861  * \retval       +1: the iteration finished
5862  * \retval        0: on success, not finished
5863  * \retval      -ve: on error
5864  */
5865 static int lfsck_orphan_it_next(const struct lu_env *env,
5866                                 struct dt_it *di)
5867 {
5868         struct lfsck_thread_info        *info   = lfsck_env_info(env);
5869         struct filter_fid_old           *pfid   = &info->lti_old_pfid;
5870         struct lu_attr                  *la     = &info->lti_la;
5871         struct lfsck_orphan_it          *it     = (struct lfsck_orphan_it *)di;
5872         struct lu_fid                   *key    = &it->loi_key;
5873         struct lu_orphan_rec            *rec    = &it->loi_rec;
5874         struct lfsck_component          *com    = it->loi_com;
5875         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5876         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
5877         struct dt_object                *obj;
5878         struct lfsck_rbtree_node        *lrn;
5879         int                              pos;
5880         int                              rc;
5881         __u32                            save;
5882         __u32                            idx    = it->loi_llst->llst_index;
5883         bool                             exact  = false;
5884         ENTRY;
5885
5886         if (it->loi_over)
5887                 RETURN(1);
5888
5889 again0:
5890         lrn = it->loi_lrn;
5891         if (lrn == NULL) {
5892                 lrn = lfsck_rbtree_search(llsd, key, &exact);
5893                 if (lrn == NULL) {
5894                         it->loi_over = 1;
5895                         RETURN(1);
5896                 }
5897
5898                 it->loi_lrn = lrn;
5899                 if (!exact) {
5900                         key->f_seq = lrn->lrn_seq;
5901                         key->f_oid = lrn->lrn_first_oid;
5902                         key->f_ver = 0;
5903                 }
5904         } else {
5905                 key->f_oid++;
5906                 if (unlikely(key->f_oid == 0)) {
5907                         key->f_seq++;
5908                         it->loi_lrn = NULL;
5909                         goto again0;
5910                 }
5911
5912                 if (key->f_oid >=
5913                     lrn->lrn_first_oid + LFSCK_RBTREE_BITMAP_WIDTH) {
5914                         it->loi_lrn = NULL;
5915                         goto again0;
5916                 }
5917         }
5918
5919         if (unlikely(atomic_read(&lrn->lrn_known_count) <=
5920                      atomic_read(&lrn->lrn_accessed_count))) {
5921                 struct rb_node *next = rb_next(&lrn->lrn_node);
5922
5923                 while (next != NULL) {
5924                         lrn = rb_entry(next, struct lfsck_rbtree_node,
5925                                        lrn_node);
5926                         if (atomic_read(&lrn->lrn_known_count) >
5927                             atomic_read(&lrn->lrn_accessed_count))
5928                                 break;
5929                         next = rb_next(next);
5930                 }
5931
5932                 if (next == NULL) {
5933                         it->loi_over = 1;
5934                         RETURN(1);
5935                 }
5936
5937                 it->loi_lrn = lrn;
5938                 key->f_seq = lrn->lrn_seq;
5939                 key->f_oid = lrn->lrn_first_oid;
5940                 key->f_ver = 0;
5941         }
5942
5943         pos = key->f_oid - lrn->lrn_first_oid;
5944
5945 again1:
5946         pos = find_next_bit(lrn->lrn_known_bitmap,
5947                             LFSCK_RBTREE_BITMAP_WIDTH, pos);
5948         if (pos >= LFSCK_RBTREE_BITMAP_WIDTH) {
5949                 key->f_oid = lrn->lrn_first_oid + pos;
5950                 if (unlikely(key->f_oid < lrn->lrn_first_oid)) {
5951                         key->f_seq++;
5952                         key->f_oid = 0;
5953                 }
5954                 it->loi_lrn = NULL;
5955                 goto again0;
5956         }
5957
5958         if (test_bit(pos, lrn->lrn_accessed_bitmap)) {
5959                 pos++;
5960                 goto again1;
5961         }
5962
5963         key->f_oid = lrn->lrn_first_oid + pos;
5964         obj = lfsck_object_find(env, lfsck, key);
5965         if (IS_ERR(obj)) {
5966                 rc = PTR_ERR(obj);
5967                 if (rc == -ENOENT) {
5968                         pos++;
5969                         goto again1;
5970                 }
5971                 RETURN(rc);
5972         }
5973
5974         dt_read_lock(env, obj, 0);
5975         if (dt_object_exists(obj) == 0 ||
5976             lfsck_is_dead_obj(obj)) {
5977                 dt_read_unlock(env, obj);
5978                 lfsck_object_put(env, obj);
5979                 pos++;
5980                 goto again1;
5981         }
5982
5983         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
5984         if (rc != 0)
5985                 GOTO(out, rc);
5986
5987         rc = dt_xattr_get(env, obj, lfsck_buf_get(env, pfid, sizeof(*pfid)),
5988                           XATTR_NAME_FID, BYPASS_CAPA);
5989         if (rc == -ENODATA) {
5990                 /* For the pre-created OST-object, update the bitmap to avoid
5991                  * others LFSCK (second phase) iteration to touch it again. */
5992                 if (la->la_ctime == 0) {
5993                         if (!test_and_set_bit(pos, lrn->lrn_accessed_bitmap))
5994                                 atomic_inc(&lrn->lrn_accessed_count);
5995
5996                         /* For the race between repairing dangling referenced
5997                          * MDT-object and unlink the file, it may left orphan
5998                          * OST-object there. Destroy it now! */
5999                         if (unlikely(!(la->la_mode & S_ISUID))) {
6000                                 dt_read_unlock(env, obj);
6001                                 lfsck_layout_destroy_orphan(env,
6002                                                             lfsck->li_bottom,
6003                                                             obj);
6004                                 lfsck_object_put(env, obj);
6005                                 pos++;
6006                                 goto again1;
6007                         }
6008                 } else if (idx == 0) {
6009                         /* If the orphan OST-object has no parent information,
6010                          * regard it as referenced by the MDT-object on MDT0. */
6011                         fid_zero(&rec->lor_fid);
6012                         rec->lor_uid = la->la_uid;
6013                         rec->lor_gid = la->la_gid;
6014                         GOTO(out, rc = 0);
6015                 }
6016
6017                 dt_read_unlock(env, obj);
6018                 lfsck_object_put(env, obj);
6019                 pos++;
6020                 goto again1;
6021         }
6022
6023         if (rc < 0)
6024                 GOTO(out, rc);
6025
6026         if (rc != sizeof(struct filter_fid) &&
6027             rc != sizeof(struct filter_fid_old))
6028                 GOTO(out, rc = -EINVAL);
6029
6030         fid_le_to_cpu(&rec->lor_fid, &pfid->ff_parent);
6031         /* Currently, the filter_fid::ff_parent::f_ver is not the real parent
6032          * MDT-object's FID::f_ver, instead it is the OST-object index in its
6033          * parent MDT-object's layout EA. */
6034         save = rec->lor_fid.f_stripe_idx;
6035         rec->lor_fid.f_ver = 0;
6036         rc = lfsck_fid_match_idx(env, lfsck, &rec->lor_fid, idx);
6037         /* If the orphan OST-object does not claim the MDT, then next.
6038          *
6039          * If we do not know whether it matches or not, then return it
6040          * to the MDT for further check. */
6041         if (rc == 0) {
6042                 dt_read_unlock(env, obj);
6043                 lfsck_object_put(env, obj);
6044                 pos++;
6045                 goto again1;
6046         }
6047
6048         rec->lor_fid.f_stripe_idx = save;
6049         rec->lor_uid = la->la_uid;
6050         rec->lor_gid = la->la_gid;
6051
6052         CDEBUG(D_LFSCK, "%s: return orphan "DFID", PFID "DFID", owner %u:%u\n",
6053                lfsck_lfsck2name(com->lc_lfsck), PFID(key), PFID(&rec->lor_fid),
6054                rec->lor_uid, rec->lor_gid);
6055
6056         GOTO(out, rc = 0);
6057
6058 out:
6059         dt_read_unlock(env, obj);
6060         lfsck_object_put(env, obj);
6061         if (rc == 0)
6062                 it->loi_hash++;
6063
6064         return rc;
6065 }
6066
6067 /**
6068  * \retval       +1: locate to the exactly position
6069  * \retval        0: cannot locate to the exactly position,
6070  *                   call next() to move to a valid position.
6071  * \retval      -ve: on error
6072  */
6073 static int lfsck_orphan_it_get(const struct lu_env *env,
6074                                struct dt_it *di,
6075                                const struct dt_key *key)
6076 {
6077         struct lfsck_orphan_it  *it   = (struct lfsck_orphan_it *)di;
6078         int                      rc;
6079
6080         it->loi_key = *(struct lu_fid *)key;
6081         rc = lfsck_orphan_it_next(env, di);
6082         if (rc == 1)
6083                 return 0;
6084
6085         if (rc == 0)
6086                 return 1;
6087
6088         return rc;
6089 }
6090
6091 static void lfsck_orphan_it_put(const struct lu_env *env,
6092                                 struct dt_it *di)
6093 {
6094 }
6095
6096 static struct dt_key *lfsck_orphan_it_key(const struct lu_env *env,
6097                                           const struct dt_it *di)
6098 {
6099         struct lfsck_orphan_it *it = (struct lfsck_orphan_it *)di;
6100
6101         return (struct dt_key *)&it->loi_key;
6102 }
6103
6104 static int lfsck_orphan_it_key_size(const struct lu_env *env,
6105                                     const struct dt_it *di)
6106 {
6107         return sizeof(struct lu_fid);
6108 }
6109
6110 static int lfsck_orphan_it_rec(const struct lu_env *env,
6111                                const struct dt_it *di,
6112                                struct dt_rec *rec,
6113                                __u32 attr)
6114 {
6115         struct lfsck_orphan_it *it = (struct lfsck_orphan_it *)di;
6116
6117         *(struct lu_orphan_rec *)rec = it->loi_rec;
6118
6119         return 0;
6120 }
6121
6122 static __u64 lfsck_orphan_it_store(const struct lu_env *env,
6123                                    const struct dt_it *di)
6124 {
6125         struct lfsck_orphan_it  *it   = (struct lfsck_orphan_it *)di;
6126
6127         return it->loi_hash;
6128 }
6129
6130 /**
6131  * \retval       +1: locate to the exactly position
6132  * \retval        0: cannot locate to the exactly position,
6133  *                   call next() to move to a valid position.
6134  * \retval      -ve: on error
6135  */
6136 static int lfsck_orphan_it_load(const struct lu_env *env,
6137                                 const struct dt_it *di,
6138                                 __u64 hash)
6139 {
6140         struct lfsck_orphan_it           *it   = (struct lfsck_orphan_it *)di;
6141         struct lfsck_layout_slave_target *llst = it->loi_llst;
6142         int                               rc;
6143
6144         LASSERT(llst != NULL);
6145
6146         if (hash != llst->llst_hash) {
6147                 CDEBUG(D_LFSCK, "%s: the given hash "LPU64" for orphan "
6148                        "iteration does not match the one when fini "
6149                        LPU64", to be reset.\n",
6150                        lfsck_lfsck2name(it->loi_com->lc_lfsck), hash,
6151                        llst->llst_hash);
6152                 fid_zero(&llst->llst_fid);
6153                 llst->llst_hash = 0;
6154         }
6155
6156         it->loi_key = llst->llst_fid;
6157         it->loi_hash = llst->llst_hash;
6158         rc = lfsck_orphan_it_next(env, (struct dt_it *)di);
6159         if (rc == 1)
6160                 return 0;
6161
6162         if (rc == 0)
6163                 return 1;
6164
6165         return rc;
6166 }
6167
6168 static int lfsck_orphan_it_key_rec(const struct lu_env *env,
6169                                    const struct dt_it *di,
6170                                    void *key_rec)
6171 {
6172         return 0;
6173 }
6174
6175 const struct dt_index_operations lfsck_orphan_index_ops = {
6176         .dio_lookup             = lfsck_orphan_index_lookup,
6177         .dio_declare_insert     = lfsck_orphan_index_declare_insert,
6178         .dio_insert             = lfsck_orphan_index_insert,
6179         .dio_declare_delete     = lfsck_orphan_index_declare_delete,
6180         .dio_delete             = lfsck_orphan_index_delete,
6181         .dio_it = {
6182                 .init           = lfsck_orphan_it_init,
6183                 .fini           = lfsck_orphan_it_fini,
6184                 .get            = lfsck_orphan_it_get,
6185                 .put            = lfsck_orphan_it_put,
6186                 .next           = lfsck_orphan_it_next,
6187                 .key            = lfsck_orphan_it_key,
6188                 .key_size       = lfsck_orphan_it_key_size,
6189                 .rec            = lfsck_orphan_it_rec,
6190                 .store          = lfsck_orphan_it_store,
6191                 .load           = lfsck_orphan_it_load,
6192                 .key_rec        = lfsck_orphan_it_key_rec,
6193         }
6194 };