lustre/lfsck/lfsck_namespace.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.  A copy is
  14  * included in the COPYING file that accompanied this code.
  15
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2013, 2017, Intel Corporation.
  24  */
  25 /*
  26  * lustre/lfsck/lfsck_namespace.c
  27  *
  28  * Author: Fan, Yong <fan.yong@intel.com>
  29  */
  30
  31 #define DEBUG_SUBSYSTEM S_LFSCK
  32
  33 #include <lu_object.h>
  34 #include <dt_object.h>
  35 #include <md_object.h>
  36 #include <lustre_fid.h>
  37 #include <lustre_lib.h>
  38 #include <lustre_net.h>
  39
  40 #include "lfsck_internal.h"
  41
  42 #define LFSCK_NAMESPACE_MAGIC_V1        0xA0629D03
  43 #define LFSCK_NAMESPACE_MAGIC_V2        0xA0621A0B
  44 #define LFSCK_NAMESPACE_MAGIC_V3        0xA06249FF
  45
  46 /* For Lustre-2.x (x <= 6), the namespace LFSCK used LFSCK_NAMESPACE_MAGIC_V1
  47  * as the trace file magic. When downgrade to such old release, the old LFSCK
  48  * will not recognize the new LFSCK_NAMESPACE_MAGIC_V2 in the new trace file,
  49  * then it will reset the whole LFSCK, and will not cause start failure. The
  50  * similar case will happen when upgrade from such old release. */
  51 #define LFSCK_NAMESPACE_MAGIC           LFSCK_NAMESPACE_MAGIC_V3
  52
  53 enum lfsck_nameentry_check {
  54         LFSCK_NAMEENTRY_DEAD            = 1, /* The object has been unlinked. */
  55         LFSCK_NAMEENTRY_REMOVED         = 2, /* The entry has been removed. */
  56         LFSCK_NAMEENTRY_RECREATED       = 3, /* The entry has been recreated. */
  57 };
  58
  59 static struct lfsck_namespace_req *
  60 lfsck_namespace_assistant_req_init(struct lfsck_instance *lfsck,
  61                                    struct lfsck_assistant_object *lso,
  62                                    struct lu_dirent *ent, __u16 type)
  63 {
  64         struct lfsck_namespace_req *lnr;
  65         int                         size;
  66
  67         size = sizeof(*lnr) + (ent->lde_namelen & ~3) + 4;
  68         OBD_ALLOC(lnr, size);
  69         if (lnr == NULL)
  70                 return ERR_PTR(-ENOMEM);
  71
  72         INIT_LIST_HEAD(&lnr->lnr_lar.lar_list);
  73         lnr->lnr_lar.lar_parent = lfsck_assistant_object_get(lso);
  74         lnr->lnr_lmv = lfsck_lmv_get(lfsck->li_lmv);
  75         lnr->lnr_fid = ent->lde_fid;
  76         lnr->lnr_dir_cookie = ent->lde_hash;
  77         lnr->lnr_attr = ent->lde_attrs;
  78         lnr->lnr_size = size;
  79         lnr->lnr_type = type;
  80         lnr->lnr_namelen = ent->lde_namelen;
  81         memcpy(lnr->lnr_name, ent->lde_name, ent->lde_namelen);
  82
  83         return lnr;
  84 }
  85
  86 static void lfsck_namespace_assistant_req_fini(const struct lu_env *env,
  87                                                struct lfsck_assistant_req *lar)
  88 {
  89         struct lfsck_namespace_req *lnr =
  90                         container_of0(lar, struct lfsck_namespace_req, lnr_lar);
  91
  92         if (lnr->lnr_lmv != NULL)
  93                 lfsck_lmv_put(env, lnr->lnr_lmv);
  94
  95         lfsck_assistant_object_put(env, lar->lar_parent);
  96         OBD_FREE(lnr, lnr->lnr_size);
  97 }
  98
  99 static void lfsck_namespace_le_to_cpu(struct lfsck_namespace *dst,
 100                                       struct lfsck_namespace *src)
 101 {
 102         dst->ln_magic = le32_to_cpu(src->ln_magic);
 103         dst->ln_status = le32_to_cpu(src->ln_status);
 104         dst->ln_flags = le32_to_cpu(src->ln_flags);
 105         dst->ln_success_count = le32_to_cpu(src->ln_success_count);
 106         dst->ln_run_time_phase1 = le64_to_cpu(src->ln_run_time_phase1);
 107         dst->ln_run_time_phase2 = le64_to_cpu(src->ln_run_time_phase2);
 108         dst->ln_time_last_complete = le64_to_cpu(src->ln_time_last_complete);
 109         dst->ln_time_latest_start = le64_to_cpu(src->ln_time_latest_start);
 110         dst->ln_time_last_checkpoint =
 111                                 le64_to_cpu(src->ln_time_last_checkpoint);
 112         lfsck_position_le_to_cpu(&dst->ln_pos_latest_start,
 113                                  &src->ln_pos_latest_start);
 114         lfsck_position_le_to_cpu(&dst->ln_pos_last_checkpoint,
 115                                  &src->ln_pos_last_checkpoint);
 116         lfsck_position_le_to_cpu(&dst->ln_pos_first_inconsistent,
 117                                  &src->ln_pos_first_inconsistent);
 118         dst->ln_items_checked = le64_to_cpu(src->ln_items_checked);
 119         dst->ln_items_repaired = le64_to_cpu(src->ln_items_repaired);
 120         dst->ln_items_failed = le64_to_cpu(src->ln_items_failed);
 121         dst->ln_dirs_checked = le64_to_cpu(src->ln_dirs_checked);
 122         dst->ln_objs_checked_phase2 = le64_to_cpu(src->ln_objs_checked_phase2);
 123         dst->ln_objs_repaired_phase2 =
 124                                 le64_to_cpu(src->ln_objs_repaired_phase2);
 125         dst->ln_objs_failed_phase2 = le64_to_cpu(src->ln_objs_failed_phase2);
 126         dst->ln_objs_nlink_repaired = le64_to_cpu(src->ln_objs_nlink_repaired);
 127         fid_le_to_cpu(&dst->ln_fid_latest_scanned_phase2,
 128                       &src->ln_fid_latest_scanned_phase2);
 129         dst->ln_dirent_repaired = le64_to_cpu(src->ln_dirent_repaired);
 130         dst->ln_linkea_repaired = le64_to_cpu(src->ln_linkea_repaired);
 131         dst->ln_mul_linked_checked = le64_to_cpu(src->ln_mul_linked_checked);
 132         dst->ln_mul_linked_repaired = le64_to_cpu(src->ln_mul_linked_repaired);
 133         dst->ln_unknown_inconsistency =
 134                                 le64_to_cpu(src->ln_unknown_inconsistency);
 135         dst->ln_unmatched_pairs_repaired =
 136                                 le64_to_cpu(src->ln_unmatched_pairs_repaired);
 137         dst->ln_dangling_repaired = le64_to_cpu(src->ln_dangling_repaired);
 138         dst->ln_mul_ref_repaired = le64_to_cpu(src->ln_mul_ref_repaired);
 139         dst->ln_bad_type_repaired = le64_to_cpu(src->ln_bad_type_repaired);
 140         dst->ln_lost_dirent_repaired =
 141                                 le64_to_cpu(src->ln_lost_dirent_repaired);
 142         dst->ln_striped_dirs_scanned =
 143                                 le64_to_cpu(src->ln_striped_dirs_scanned);
 144         dst->ln_striped_dirs_repaired =
 145                                 le64_to_cpu(src->ln_striped_dirs_repaired);
 146         dst->ln_striped_dirs_failed =
 147                                 le64_to_cpu(src->ln_striped_dirs_failed);
 148         dst->ln_striped_dirs_disabled =
 149                                 le64_to_cpu(src->ln_striped_dirs_disabled);
 150         dst->ln_striped_dirs_skipped =
 151                                 le64_to_cpu(src->ln_striped_dirs_skipped);
 152         dst->ln_striped_shards_scanned =
 153                                 le64_to_cpu(src->ln_striped_shards_scanned);
 154         dst->ln_striped_shards_repaired =
 155                                 le64_to_cpu(src->ln_striped_shards_repaired);
 156         dst->ln_striped_shards_failed =
 157                                 le64_to_cpu(src->ln_striped_shards_failed);
 158         dst->ln_striped_shards_skipped =
 159                                 le64_to_cpu(src->ln_striped_shards_skipped);
 160         dst->ln_name_hash_repaired = le64_to_cpu(src->ln_name_hash_repaired);
 161         dst->ln_local_lpf_scanned = le64_to_cpu(src->ln_local_lpf_scanned);
 162         dst->ln_local_lpf_moved = le64_to_cpu(src->ln_local_lpf_moved);
 163         dst->ln_local_lpf_skipped = le64_to_cpu(src->ln_local_lpf_skipped);
 164         dst->ln_local_lpf_failed = le64_to_cpu(src->ln_local_lpf_failed);
 165         dst->ln_bitmap_size = le32_to_cpu(src->ln_bitmap_size);
 166         dst->ln_time_latest_reset = le64_to_cpu(src->ln_time_latest_reset);
 167         dst->ln_linkea_overflow_cleared =
 168                                 le64_to_cpu(src->ln_linkea_overflow_cleared);
 169         dst->ln_agent_entries_repaired =
 170                                 le64_to_cpu(src->ln_agent_entries_repaired);
 171 }
 172
 173 static void lfsck_namespace_cpu_to_le(struct lfsck_namespace *dst,
 174                                       struct lfsck_namespace *src)
 175 {
 176         dst->ln_magic = cpu_to_le32(src->ln_magic);
 177         dst->ln_status = cpu_to_le32(src->ln_status);
 178         dst->ln_flags = cpu_to_le32(src->ln_flags);
 179         dst->ln_success_count = cpu_to_le32(src->ln_success_count);
 180         dst->ln_run_time_phase1 = cpu_to_le64(src->ln_run_time_phase1);
 181         dst->ln_run_time_phase2 = cpu_to_le64(src->ln_run_time_phase2);
 182         dst->ln_time_last_complete = cpu_to_le64(src->ln_time_last_complete);
 183         dst->ln_time_latest_start = cpu_to_le64(src->ln_time_latest_start);
 184         dst->ln_time_last_checkpoint =
 185                                 cpu_to_le64(src->ln_time_last_checkpoint);
 186         lfsck_position_cpu_to_le(&dst->ln_pos_latest_start,
 187                                  &src->ln_pos_latest_start);
 188         lfsck_position_cpu_to_le(&dst->ln_pos_last_checkpoint,
 189                                  &src->ln_pos_last_checkpoint);
 190         lfsck_position_cpu_to_le(&dst->ln_pos_first_inconsistent,
 191                                  &src->ln_pos_first_inconsistent);
 192         dst->ln_items_checked = cpu_to_le64(src->ln_items_checked);
 193         dst->ln_items_repaired = cpu_to_le64(src->ln_items_repaired);
 194         dst->ln_items_failed = cpu_to_le64(src->ln_items_failed);
 195         dst->ln_dirs_checked = cpu_to_le64(src->ln_dirs_checked);
 196         dst->ln_objs_checked_phase2 = cpu_to_le64(src->ln_objs_checked_phase2);
 197         dst->ln_objs_repaired_phase2 =
 198                                 cpu_to_le64(src->ln_objs_repaired_phase2);
 199         dst->ln_objs_failed_phase2 = cpu_to_le64(src->ln_objs_failed_phase2);
 200         dst->ln_objs_nlink_repaired = cpu_to_le64(src->ln_objs_nlink_repaired);
 201         fid_cpu_to_le(&dst->ln_fid_latest_scanned_phase2,
 202                       &src->ln_fid_latest_scanned_phase2);
 203         dst->ln_dirent_repaired = cpu_to_le64(src->ln_dirent_repaired);
 204         dst->ln_linkea_repaired = cpu_to_le64(src->ln_linkea_repaired);
 205         dst->ln_mul_linked_checked = cpu_to_le64(src->ln_mul_linked_checked);
 206         dst->ln_mul_linked_repaired = cpu_to_le64(src->ln_mul_linked_repaired);
 207         dst->ln_unknown_inconsistency =
 208                                 cpu_to_le64(src->ln_unknown_inconsistency);
 209         dst->ln_unmatched_pairs_repaired =
 210                                 cpu_to_le64(src->ln_unmatched_pairs_repaired);
 211         dst->ln_dangling_repaired = cpu_to_le64(src->ln_dangling_repaired);
 212         dst->ln_mul_ref_repaired = cpu_to_le64(src->ln_mul_ref_repaired);
 213         dst->ln_bad_type_repaired = cpu_to_le64(src->ln_bad_type_repaired);
 214         dst->ln_lost_dirent_repaired =
 215                                 cpu_to_le64(src->ln_lost_dirent_repaired);
 216         dst->ln_striped_dirs_scanned =
 217                                 cpu_to_le64(src->ln_striped_dirs_scanned);
 218         dst->ln_striped_dirs_repaired =
 219                                 cpu_to_le64(src->ln_striped_dirs_repaired);
 220         dst->ln_striped_dirs_failed =
 221                                 cpu_to_le64(src->ln_striped_dirs_failed);
 222         dst->ln_striped_dirs_disabled =
 223                                 cpu_to_le64(src->ln_striped_dirs_disabled);
 224         dst->ln_striped_dirs_skipped =
 225                                 cpu_to_le64(src->ln_striped_dirs_skipped);
 226         dst->ln_striped_shards_scanned =
 227                                 cpu_to_le64(src->ln_striped_shards_scanned);
 228         dst->ln_striped_shards_repaired =
 229                                 cpu_to_le64(src->ln_striped_shards_repaired);
 230         dst->ln_striped_shards_failed =
 231                                 cpu_to_le64(src->ln_striped_shards_failed);
 232         dst->ln_striped_shards_skipped =
 233                                 cpu_to_le64(src->ln_striped_shards_skipped);
 234         dst->ln_name_hash_repaired = cpu_to_le64(src->ln_name_hash_repaired);
 235         dst->ln_local_lpf_scanned = cpu_to_le64(src->ln_local_lpf_scanned);
 236         dst->ln_local_lpf_moved = cpu_to_le64(src->ln_local_lpf_moved);
 237         dst->ln_local_lpf_skipped = cpu_to_le64(src->ln_local_lpf_skipped);
 238         dst->ln_local_lpf_failed = cpu_to_le64(src->ln_local_lpf_failed);
 239         dst->ln_bitmap_size = cpu_to_le32(src->ln_bitmap_size);
 240         dst->ln_time_latest_reset = cpu_to_le64(src->ln_time_latest_reset);
 241         dst->ln_linkea_overflow_cleared =
 242                                 cpu_to_le64(src->ln_linkea_overflow_cleared);
 243         dst->ln_agent_entries_repaired =
 244                                 cpu_to_le64(src->ln_agent_entries_repaired);
 245 }
 246
 247 static void lfsck_namespace_record_failure(const struct lu_env *env,
 248                                            struct lfsck_instance *lfsck,
 249                                            struct lfsck_namespace *ns)
 250 {
 251         struct lfsck_position pos;
 252
 253         ns->ln_items_failed++;
 254         lfsck_pos_fill(env, lfsck, &pos, false);
 255         if (lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent) ||
 256             lfsck_pos_is_eq(&pos, &ns->ln_pos_first_inconsistent) < 0) {
 257                 ns->ln_pos_first_inconsistent = pos;
 258
 259                 CDEBUG(D_LFSCK, "%s: namespace LFSCK hit first non-repaired "
 260                        "inconsistency at the pos [%llu, "DFID", %#llx]\n",
 261                        lfsck_lfsck2name(lfsck),
 262                        ns->ln_pos_first_inconsistent.lp_oit_cookie,
 263                        PFID(&ns->ln_pos_first_inconsistent.lp_dir_parent),
 264                        ns->ln_pos_first_inconsistent.lp_dir_cookie);
 265         }
 266 }
 267
 268 /**
 269  * Load the MDT bitmap from the lfsck_namespace trace file.
 270  *
 271  * \param[in] env       pointer to the thread context
 272  * \param[in] com       pointer to the lfsck component
 273  *
 274  * \retval              0 for success
 275  * \retval              negative error number on failure or data corruption
 276  */
 277 static int lfsck_namespace_load_bitmap(const struct lu_env *env,
 278                                        struct lfsck_component *com)
 279 {
 280         struct dt_object                *obj    = com->lc_obj;
 281         struct lfsck_assistant_data     *lad    = com->lc_data;
 282         struct lfsck_namespace          *ns     = com->lc_file_ram;
 283         struct cfs_bitmap                       *bitmap = lad->lad_bitmap;
 284         ssize_t                          size;
 285         __u32                            nbits;
 286         int                              rc;
 287         ENTRY;
 288
 289         if (com->lc_lfsck->li_mdt_descs.ltd_tgts_bitmap->size >
 290             ns->ln_bitmap_size)
 291                 nbits = com->lc_lfsck->li_mdt_descs.ltd_tgts_bitmap->size;
 292         else
 293                 nbits = ns->ln_bitmap_size;
 294
 295         if (unlikely(nbits < BITS_PER_LONG))
 296                 nbits = BITS_PER_LONG;
 297
 298         if (nbits > bitmap->size) {
 299                 __u32 new_bits = bitmap->size;
 300                 struct cfs_bitmap *new_bitmap;
 301
 302                 while (new_bits < nbits)
 303                         new_bits <<= 1;
 304
 305                 new_bitmap = CFS_ALLOCATE_BITMAP(new_bits);
 306                 if (new_bitmap == NULL)
 307                         RETURN(-ENOMEM);
 308
 309                 lad->lad_bitmap = new_bitmap;
 310                 CFS_FREE_BITMAP(bitmap);
 311                 bitmap = new_bitmap;
 312         }
 313
 314         if (ns->ln_bitmap_size == 0) {
 315                 lad->lad_incomplete = 0;
 316                 CFS_RESET_BITMAP(bitmap);
 317
 318                 RETURN(0);
 319         }
 320
 321         size = (ns->ln_bitmap_size + 7) >> 3;
 322         rc = dt_xattr_get(env, obj,
 323                           lfsck_buf_get(env, bitmap->data, size),
 324                           XATTR_NAME_LFSCK_BITMAP);
 325         if (rc != size)
 326                 RETURN(rc >= 0 ? -EINVAL : rc);
 327
 328         if (cfs_bitmap_check_empty(bitmap))
 329                 lad->lad_incomplete = 0;
 330         else
 331                 lad->lad_incomplete = 1;
 332
 333         RETURN(0);
 334 }
 335
 336 /**
 337  * Load namespace LFSCK statistics information from the trace file.
 338  *
 339  * \param[in] env       pointer to the thread context
 340  * \param[in] com       pointer to the lfsck component
 341  *
 342  * \retval              0 for success
 343  * \retval              negative error number on failure
 344  */
 345 static int lfsck_namespace_load(const struct lu_env *env,
 346                                 struct lfsck_component *com)
 347 {
 348         int len = com->lc_file_size;
 349         int rc;
 350
 351         rc = dt_xattr_get(env, com->lc_obj,
 352                           lfsck_buf_get(env, com->lc_file_disk, len),
 353                           XATTR_NAME_LFSCK_NAMESPACE);
 354         if (rc == len) {
 355                 struct lfsck_namespace *ns = com->lc_file_ram;
 356
 357                 lfsck_namespace_le_to_cpu(ns,
 358                                 (struct lfsck_namespace *)com->lc_file_disk);
 359                 if (ns->ln_magic != LFSCK_NAMESPACE_MAGIC) {
 360                         CDEBUG(D_LFSCK, "%s: invalid lfsck_namespace magic "
 361                                "%#x != %#x\n", lfsck_lfsck2name(com->lc_lfsck),
 362                                ns->ln_magic, LFSCK_NAMESPACE_MAGIC);
 363                         rc = -ESTALE;
 364                 } else {
 365                         rc = 0;
 366                 }
 367         } else if (rc != -ENODATA) {
 368                 CDEBUG(D_LFSCK, "%s: fail to load lfsck_namespace, "
 369                        "expected = %d: rc = %d\n",
 370                        lfsck_lfsck2name(com->lc_lfsck), len, rc);
 371                 if (rc >= 0)
 372                         rc = -ESTALE;
 373         }
 374
 375         return rc;
 376 }
 377
 378 static int lfsck_namespace_store(const struct lu_env *env,
 379                                  struct lfsck_component *com)
 380 {
 381         struct dt_object                *obj    = com->lc_obj;
 382         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 383         struct lfsck_namespace          *ns     = com->lc_file_ram;
 384         struct lfsck_assistant_data     *lad    = com->lc_data;
 385         struct dt_device                *dev    = lfsck_obj2dev(obj);
 386         struct cfs_bitmap               *bitmap = NULL;
 387         struct thandle                  *handle;
 388         __u32                            nbits  = 0;
 389         int                              len    = com->lc_file_size;
 390         int                              rc;
 391         ENTRY;
 392
 393         if (lad != NULL) {
 394                 bitmap = lad->lad_bitmap;
 395                 nbits = bitmap->size;
 396
 397                 LASSERT(nbits > 0);
 398                 LASSERTF((nbits & 7) == 0, "Invalid nbits %u\n", nbits);
 399         }
 400
 401         ns->ln_bitmap_size = nbits;
 402         lfsck_namespace_cpu_to_le((struct lfsck_namespace *)com->lc_file_disk,
 403                                   ns);
 404         handle = dt_trans_create(env, dev);
 405         if (IS_ERR(handle))
 406                 GOTO(log, rc = PTR_ERR(handle));
 407
 408         rc = dt_declare_xattr_set(env, obj,
 409                                   lfsck_buf_get(env, com->lc_file_disk, len),
 410                                   XATTR_NAME_LFSCK_NAMESPACE, 0, handle);
 411         if (rc != 0)
 412                 GOTO(out, rc);
 413
 414         if (bitmap != NULL) {
 415                 rc = dt_declare_xattr_set(env, obj,
 416                                 lfsck_buf_get(env, bitmap->data, nbits >> 3),
 417                                 XATTR_NAME_LFSCK_BITMAP, 0, handle);
 418                 if (rc != 0)
 419                         GOTO(out, rc);
 420         }
 421
 422         rc = dt_trans_start_local(env, dev, handle);
 423         if (rc != 0)
 424                 GOTO(out, rc);
 425
 426         rc = dt_xattr_set(env, obj,
 427                           lfsck_buf_get(env, com->lc_file_disk, len),
 428                           XATTR_NAME_LFSCK_NAMESPACE, 0, handle);
 429         if (rc == 0 && bitmap != NULL)
 430                 rc = dt_xattr_set(env, obj,
 431                                   lfsck_buf_get(env, bitmap->data, nbits >> 3),
 432                                   XATTR_NAME_LFSCK_BITMAP, 0, handle);
 433
 434         GOTO(out, rc);
 435
 436 out:
 437         dt_trans_stop(env, dev, handle);
 438
 439 log:
 440         if (rc != 0)
 441                 CDEBUG(D_LFSCK, "%s: fail to store lfsck_namespace: rc = %d\n",
 442                        lfsck_lfsck2name(lfsck), rc);
 443         return rc;
 444 }
 445
 446 static int lfsck_namespace_init(const struct lu_env *env,
 447                                 struct lfsck_component *com)
 448 {
 449         struct lfsck_namespace *ns = com->lc_file_ram;
 450         int rc;
 451
 452         memset(ns, 0, sizeof(*ns));
 453         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
 454         ns->ln_status = LS_INIT;
 455         ns->ln_time_latest_reset = ktime_get_real_seconds();
 456         down_write(&com->lc_sem);
 457         rc = lfsck_namespace_store(env, com);
 458         if (rc == 0)
 459                 rc = lfsck_load_sub_trace_files(env, com,
 460                         &dt_lfsck_namespace_features, LFSCK_NAMESPACE, true);
 461         up_write(&com->lc_sem);
 462
 463         return rc;
 464 }
 465
 466 /**
 467  * Update the namespace LFSCK trace file for the given @fid
 468  *
 469  * \param[in] env       pointer to the thread context
 470  * \param[in] com       pointer to the lfsck component
 471  * \param[in] fid       the fid which flags to be updated in the lfsck
 472  *                      trace file
 473  * \param[in] add       true if add new flags, otherwise remove flags
 474  *
 475  * \retval              0 for success or nothing to be done
 476  * \retval              negative error number on failure
 477  */
 478 int lfsck_namespace_trace_update(const struct lu_env *env,
 479                                  struct lfsck_component *com,
 480                                  const struct lu_fid *fid,
 481                                  const __u8 flags, bool add)
 482 {
 483         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 484         struct dt_object        *obj;
 485         struct lu_fid           *key    = &lfsck_env_info(env)->lti_fid3;
 486         struct dt_device        *dev;
 487         struct thandle          *th     = NULL;
 488         int                      idx;
 489         int                      rc     = 0;
 490         __u8                     old    = 0;
 491         __u8                     new    = 0;
 492         ENTRY;
 493
 494         LASSERT(flags != 0);
 495
 496         if (unlikely(!fid_is_sane(fid)))
 497                 RETURN(0);
 498
 499         idx = lfsck_sub_trace_file_fid2idx(fid);
 500         mutex_lock(&com->lc_sub_trace_objs[idx].lsto_mutex);
 501         obj = com->lc_sub_trace_objs[idx].lsto_obj;
 502         if (unlikely(obj == NULL)) {
 503                 mutex_unlock(&com->lc_sub_trace_objs[idx].lsto_mutex);
 504                 RETURN(0);
 505         }
 506
 507         lfsck_object_get(obj);
 508         dev = lfsck_obj2dev(obj);
 509         fid_cpu_to_be(key, fid);
 510         rc = dt_lookup(env, obj, (struct dt_rec *)&old,
 511                        (const struct dt_key *)key);
 512         if (rc == -ENOENT) {
 513                 if (!add)
 514                         GOTO(unlock, rc = 0);
 515
 516                 old = 0;
 517                 new = flags;
 518         } else if (rc == 0) {
 519                 if (add) {
 520                         if ((old & flags) == flags)
 521                                 GOTO(unlock, rc = 0);
 522
 523                         new = old | flags;
 524                 } else {
 525                         if ((old & flags) == 0)
 526                                 GOTO(unlock, rc = 0);
 527
 528                         new = old & ~flags;
 529                 }
 530         } else {
 531                 GOTO(log, rc);
 532         }
 533
 534         th = dt_trans_create(env, dev);
 535         if (IS_ERR(th))
 536                 GOTO(log, rc = PTR_ERR(th));
 537
 538         if (old != 0) {
 539                 rc = dt_declare_delete(env, obj,
 540                                        (const struct dt_key *)key, th);
 541                 if (rc != 0)
 542                         GOTO(log, rc);
 543         }
 544
 545         if (new != 0) {
 546                 rc = dt_declare_insert(env, obj,
 547                                        (const struct dt_rec *)&new,
 548                                        (const struct dt_key *)key, th);
 549                 if (rc != 0)
 550                         GOTO(log, rc);
 551         }
 552
 553         rc = dt_trans_start_local(env, dev, th);
 554         if (rc != 0)
 555                 GOTO(log, rc);
 556
 557         if (old != 0) {
 558                 rc = dt_delete(env, obj, (const struct dt_key *)key, th);
 559                 if (rc != 0)
 560                         GOTO(log, rc);
 561         }
 562
 563         if (new != 0) {
 564                 rc = dt_insert(env, obj, (const struct dt_rec *)&new,
 565                                (const struct dt_key *)key, th, 1);
 566                 if (rc != 0)
 567                         GOTO(log, rc);
 568         }
 569
 570         GOTO(log, rc);
 571
 572 log:
 573         if (th != NULL && !IS_ERR(th))
 574                 dt_trans_stop(env, dev, th);
 575
 576         CDEBUG(D_LFSCK, "%s: namespace LFSCK %s flags for "DFID" in the "
 577                "trace file, flags %x, old %x, new %x: rc = %d\n",
 578                lfsck_lfsck2name(lfsck), add ? "add" : "del", PFID(fid),
 579                (__u32)flags, (__u32)old, (__u32)new, rc);
 580
 581 unlock:
 582         mutex_unlock(&com->lc_sub_trace_objs[idx].lsto_mutex);
 583         lfsck_object_put(env, obj);
 584
 585         return rc;
 586 }
 587
 588 int lfsck_namespace_check_exist(const struct lu_env *env,
 589                                 struct dt_object *dir,
 590                                 struct dt_object *obj, const char *name)
 591 {
 592         struct lu_fid    *fid = &lfsck_env_info(env)->lti_fid;
 593         int               rc;
 594         ENTRY;
 595
 596         if (unlikely(lfsck_is_dead_obj(obj)))
 597                 RETURN(LFSCK_NAMEENTRY_DEAD);
 598
 599         rc = dt_lookup(env, dir, (struct dt_rec *)fid,
 600                        (const struct dt_key *)name);
 601         if (rc == -ENOENT)
 602                 RETURN(LFSCK_NAMEENTRY_REMOVED);
 603
 604         if (rc < 0)
 605                 RETURN(rc);
 606
 607         if (!lu_fid_eq(fid, lfsck_dto2fid(obj)))
 608                 RETURN(LFSCK_NAMEENTRY_RECREATED);
 609
 610         RETURN(0);
 611 }
 612
 613 static int lfsck_declare_namespace_exec_dir(const struct lu_env *env,
 614                                             struct dt_object *obj,
 615                                             struct thandle *handle)
 616 {
 617         int rc;
 618
 619         /* For remote updating LINKEA, there may be further LFSCK action
 620          * on remote MDT after the updating, so update the LINKEA ASAP. */
 621         if (dt_object_remote(obj))
 622                 handle->th_sync = 1;
 623
 624         /* For destroying all invalid linkEA entries. */
 625         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, handle);
 626         if (rc == 0)
 627                 /* For insert new linkEA entry. */
 628                 rc = dt_declare_xattr_set(env, obj,
 629                         lfsck_buf_get_const(env, NULL, MAX_LINKEA_SIZE),
 630                         XATTR_NAME_LINK, 0, handle);
 631         return rc;
 632 }
 633
 634 int __lfsck_links_read(const struct lu_env *env, struct dt_object *obj,
 635                        struct linkea_data *ldata, bool with_rec)
 636 {
 637         int rc;
 638
 639         if (ldata->ld_buf->lb_buf == NULL)
 640                 return -ENOMEM;
 641
 642         if (!dt_object_exists(obj))
 643                 return -ENOENT;
 644
 645         rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK);
 646         if (rc == -ERANGE) {
 647                 /* Buf was too small, figure out what we need. */
 648                 rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LINK);
 649                 if (unlikely(rc == 0))
 650                         return -ENODATA;
 651
 652                 if (rc < 0)
 653                         return rc;
 654
 655                 lu_buf_realloc(ldata->ld_buf, rc);
 656                 if (ldata->ld_buf->lb_buf == NULL)
 657                         return -ENOMEM;
 658
 659                 rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK);
 660         }
 661
 662         if (unlikely(rc == 0))
 663                 return -ENODATA;
 664
 665         if (rc > 0) {
 666                 if (with_rec)
 667                         rc = linkea_init_with_rec(ldata);
 668                 else
 669                         rc = linkea_init(ldata);
 670         }
 671
 672         return rc;
 673 }
 674
 675 /**
 676  * Remove linkEA for the given object.
 677  *
 678  * The caller should take the ldlm lock before the calling.
 679  *
 680  * \param[in] env       pointer to the thread context
 681  * \param[in] com       pointer to the lfsck component
 682  * \param[in] obj       pointer to the dt_object to be handled
 683  *
 684  * \retval              0 for repaired cases
 685  * \retval              negative error number on failure
 686  */
 687 static int lfsck_namespace_links_remove(const struct lu_env *env,
 688                                         struct lfsck_component *com,
 689                                         struct dt_object *obj)
 690 {
 691         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 692         struct dt_device                *dev    = lfsck_obj2dev(obj);
 693         struct thandle                  *th     = NULL;
 694         int                              rc     = 0;
 695         ENTRY;
 696
 697         LASSERT(dt_object_remote(obj) == 0);
 698
 699         th = dt_trans_create(env, dev);
 700         if (IS_ERR(th))
 701                 GOTO(log, rc = PTR_ERR(th));
 702
 703         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, th);
 704         if (rc != 0)
 705                 GOTO(stop, rc);
 706
 707         rc = dt_trans_start_local(env, dev, th);
 708         if (rc != 0)
 709                 GOTO(stop, rc);
 710
 711         dt_write_lock(env, obj, 0);
 712         if (unlikely(lfsck_is_dead_obj(obj)))
 713                 GOTO(unlock, rc = -ENOENT);
 714
 715         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
 716                 GOTO(unlock, rc = 0);
 717
 718         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, th);
 719
 720         GOTO(unlock, rc);
 721
 722 unlock:
 723         dt_write_unlock(env, obj);
 724
 725 stop:
 726         dt_trans_stop(env, dev, th);
 727
 728 log:
 729         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove invalid linkEA "
 730                "for the object "DFID": rc = %d\n",
 731                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
 732
 733         if (rc == 0) {
 734                 struct lfsck_namespace *ns = com->lc_file_ram;
 735
 736                 ns->ln_flags |= LF_INCONSISTENT;
 737         }
 738
 739         return rc;
 740 }
 741
 742 static int lfsck_links_write(const struct lu_env *env, struct dt_object *obj,
 743                              struct linkea_data *ldata, struct thandle *handle)
 744 {
 745         struct lu_buf buf;
 746         int rc;
 747
 748         lfsck_buf_init(&buf, ldata->ld_buf->lb_buf, ldata->ld_leh->leh_len);
 749
 750 again:
 751         rc = dt_xattr_set(env, obj, &buf, XATTR_NAME_LINK, 0, handle);
 752         if (unlikely(rc == -ENOSPC)) {
 753                 rc = linkea_overflow_shrink(ldata);
 754                 if (likely(rc > 0)) {
 755                         buf.lb_len = rc;
 756                         goto again;
 757                 }
 758         }
 759
 760         return rc;
 761 }
 762
 763 static int lfsck_namespace_unpack_linkea_entry(struct linkea_data *ldata,
 764                                                struct lu_name *cname,
 765                                                struct lu_fid *pfid,
 766                                                char *buf, const int buflen)
 767 {
 768         linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, cname, pfid);
 769         if (unlikely(ldata->ld_reclen <= 0 ||
 770                      ldata->ld_reclen + sizeof(struct link_ea_header) >
 771                         ldata->ld_leh->leh_len ||
 772                      cname->ln_namelen <= 0 ||
 773                      cname->ln_namelen > NAME_MAX ||
 774                      cname->ln_namelen >= buflen ||
 775                      !fid_is_sane(pfid)))
 776                 return -EINVAL;
 777
 778         /* To guarantee the 'name' is terminated with '0'. */
 779         memcpy(buf, cname->ln_name, cname->ln_namelen);
 780         buf[cname->ln_namelen] = 0;
 781         cname->ln_name = buf;
 782
 783         return 0;
 784 }
 785
 786 static void lfsck_linkea_del_buf(struct linkea_data *ldata,
 787                                  const struct lu_name *lname)
 788 {
 789         LASSERT(ldata->ld_leh != NULL && ldata->ld_lee != NULL);
 790
 791         /* If current record is corrupted, all the subsequent
 792          * records will be dropped. */
 793         if (unlikely(ldata->ld_reclen <= 0 ||
 794                      ldata->ld_reclen + sizeof(struct link_ea_header) >
 795                         ldata->ld_leh->leh_len)) {
 796                 void *ptr = ldata->ld_lee;
 797
 798                 ldata->ld_leh->leh_len = sizeof(struct link_ea_header);
 799                 ldata->ld_leh->leh_reccount = 0;
 800                 linkea_first_entry(ldata);
 801                 while (ldata->ld_lee != NULL &&
 802                        (char *)ldata->ld_lee < (char *)ptr) {
 803                         int reclen = (ldata->ld_lee->lee_reclen[0] << 8) |
 804                                      ldata->ld_lee->lee_reclen[1];
 805
 806                         ldata->ld_leh->leh_len += reclen;
 807                         ldata->ld_leh->leh_reccount++;
 808                         ldata->ld_lee = (struct link_ea_entry *)
 809                                         ((char *)ldata->ld_lee + reclen);
 810                 }
 811
 812                 ldata->ld_lee = NULL;
 813         } else {
 814                 linkea_del_buf(ldata, lname);
 815         }
 816 }
 817
 818 static int lfsck_namespace_filter_linkea_entry(struct linkea_data *ldata,
 819                                                struct lu_name *cname,
 820                                                struct lu_fid *pfid,
 821                                                bool remove)
 822 {
 823         struct link_ea_entry    *oldlee;
 824         int                      oldlen;
 825         int                      repeated = 0;
 826
 827         oldlee = ldata->ld_lee;
 828         oldlen = ldata->ld_reclen;
 829         linkea_next_entry(ldata);
 830         while (ldata->ld_lee != NULL) {
 831                 ldata->ld_reclen = (ldata->ld_lee->lee_reclen[0] << 8) |
 832                                    ldata->ld_lee->lee_reclen[1];
 833                 if (unlikely(ldata->ld_reclen == oldlen &&
 834                              memcmp(ldata->ld_lee, oldlee, oldlen) == 0)) {
 835                         repeated++;
 836                         if (!remove)
 837                                 break;
 838
 839                         lfsck_linkea_del_buf(ldata, cname);
 840                 } else {
 841                         linkea_next_entry(ldata);
 842                 }
 843         }
 844         ldata->ld_lee = oldlee;
 845         ldata->ld_reclen = oldlen;
 846
 847         return repeated;
 848 }
 849
 850 /**
 851  * Insert orphan into .lustre/lost+found/MDTxxxx/ locally.
 852  *
 853  * Add the specified orphan MDT-object to the .lustre/lost+found/MDTxxxx/
 854  * with the given type to generate the name, the detailed rules for name
 855  * have been described as following.
 856  *
 857  * The function also generates the linkEA corresponding to the name entry
 858  * under the .lustre/lost+found/MDTxxxx/ for the orphan MDT-object.
 859  *
 860  * \param[in] env       pointer to the thread context
 861  * \param[in] com       pointer to the lfsck component
 862  * \param[in] orphan    pointer to the orphan MDT-object
 863  * \param[in] infix     additional information for the orphan name, such as
 864  *                      the FID for original
 865  * \param[in] type      the type for describing why the orphan MDT-object is
 866  *                      created. The rules are as following:
 867  *
 868  *  type "D":           The MDT-object is a directory, it may knows its parent
 869  *                      but because there is no valid linkEA, the LFSCK cannot
 870  *                      know where to put it back to the namespace.
 871  *  type "O":           The MDT-object has no linkEA, and there is no name
 872  *                      entry that references the MDT-object.
 873  *
 874  *  type "S":           The orphan MDT-object is a shard of a striped directory
 875  *
 876  * \see lfsck_layout_recreate_parent() for more types.
 877  *
 878  * The orphan name will be like:
 879  * ${FID}-${infix}-${type}-${conflict_version}
 880  *
 881  * \param[out] count    if some others inserted some linkEA entries by race,
 882  *                      then return the linkEA entries count.
 883  *
 884  * \retval              positive number for repaired cases
 885  * \retval              0 if needs to repair nothing
 886  * \retval              negative error number on failure
 887  */
 888 static int lfsck_namespace_insert_orphan(const struct lu_env *env,
 889                                          struct lfsck_component *com,
 890                                          struct dt_object *orphan,
 891                                          const char *infix, const char *type,
 892                                          int *count)
 893 {
 894         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 895         struct lu_name                  *cname  = &info->lti_name;
 896         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
 897         struct lu_attr                  *la     = &info->lti_la2;
 898         const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
 899         const struct lu_fid             *pfid;
 900         struct lu_fid                    tfid;
 901         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 902         struct dt_device                *dev    = lfsck_obj2dev(orphan);
 903         struct dt_object                *parent;
 904         struct thandle                  *th     = NULL;
 905         struct lfsck_lock_handle        *pllh   = &info->lti_llh;
 906         struct lustre_handle             clh    = { 0 };
 907         struct linkea_data               ldata2 = { NULL };
 908         struct lu_buf                    linkea_buf;
 909         int                              namelen;
 910         int                              idx    = 0;
 911         int                              rc     = 0;
 912         bool                             exist  = false;
 913         ENTRY;
 914
 915         cname->ln_name = NULL;
 916         if (unlikely(lfsck->li_lpf_obj == NULL))
 917                 GOTO(log, rc = -ENXIO);
 918
 919         parent = lfsck->li_lpf_obj;
 920         pfid = lfsck_dto2fid(parent);
 921
 922 again:
 923         do {
 924                 namelen = snprintf(info->lti_key, NAME_MAX, DFID"%s-%s-%d",
 925                                    PFID(cfid), infix, type, idx++);
 926                 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
 927                                (const struct dt_key *)info->lti_key);
 928                 if (rc != 0 && rc != -ENOENT)
 929                         GOTO(log, rc);
 930
 931                 if (unlikely(rc == 0 && lu_fid_eq(cfid, &tfid)))
 932                         exist = true;
 933         } while (rc == 0 && !exist);
 934
 935         rc = lfsck_lock(env, lfsck, parent, info->lti_key, pllh,
 936                         MDS_INODELOCK_UPDATE, LCK_PW);
 937         if (rc != 0)
 938                 GOTO(log, rc);
 939
 940         /* Re-check whether the name conflict with othrs after taken
 941          * the ldlm lock. */
 942         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
 943                        (const struct dt_key *)info->lti_key);
 944         if (rc == 0) {
 945                 if (!lu_fid_eq(cfid, &tfid)) {
 946                         exist = false;
 947                         lfsck_unlock(pllh);
 948                         goto again;
 949                 }
 950
 951                 exist = true;
 952         } else if (rc != -ENOENT) {
 953                 GOTO(log, rc);
 954         } else {
 955                 exist = false;
 956         }
 957
 958         cname->ln_name = info->lti_key;
 959         cname->ln_namelen = namelen;
 960         rc = linkea_links_new(&ldata2, &info->lti_linkea_buf2,
 961                               cname, pfid);
 962         if (rc != 0)
 963                 GOTO(log, rc);
 964
 965         rc = lfsck_ibits_lock(env, lfsck, orphan, &clh,
 966                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_LOOKUP |
 967                               MDS_INODELOCK_XATTR, LCK_EX);
 968         if (rc != 0)
 969                 GOTO(log, rc);
 970
 971         lfsck_buf_init(&linkea_buf, ldata2.ld_buf->lb_buf,
 972                        ldata2.ld_leh->leh_len);
 973         th = dt_trans_create(env, dev);
 974         if (IS_ERR(th))
 975                 GOTO(log, rc = PTR_ERR(th));
 976
 977         if (S_ISDIR(lfsck_object_type(orphan))) {
 978                 rc = dt_declare_delete(env, orphan,
 979                                        (const struct dt_key *)dotdot, th);
 980                 if (rc != 0)
 981                         GOTO(stop, rc);
 982
 983                 rec->rec_type = S_IFDIR;
 984                 rec->rec_fid = pfid;
 985                 rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
 986                                        (const struct dt_key *)dotdot, th);
 987                 if (rc != 0)
 988                         GOTO(stop, rc);
 989         }
 990
 991         rc = dt_declare_xattr_set(env, orphan, &linkea_buf,
 992                                   XATTR_NAME_LINK, 0, th);
 993         if (rc != 0)
 994                 GOTO(stop, rc);
 995
 996         if (!exist) {
 997                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
 998                 rec->rec_fid = cfid;
 999                 rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1000                                        (const struct dt_key *)cname->ln_name,
1001                                        th);
1002                 if (rc != 0)
1003                         GOTO(stop, rc);
1004
1005                 if (S_ISDIR(rec->rec_type)) {
1006                         rc = dt_declare_ref_add(env, parent, th);
1007                         if (rc != 0)
1008                                 GOTO(stop, rc);
1009                 }
1010         }
1011
1012         memset(la, 0, sizeof(*la));
1013         la->la_ctime = ktime_get_real_seconds();
1014         la->la_valid = LA_CTIME;
1015         rc = dt_declare_attr_set(env, orphan, la, th);
1016         if (rc != 0)
1017                 GOTO(stop, rc);
1018
1019         rc = dt_trans_start_local(env, dev, th);
1020         if (rc != 0)
1021                 GOTO(stop, rc);
1022
1023         dt_write_lock(env, orphan, 0);
1024         rc = lfsck_links_read2_with_rec(env, orphan, &ldata2);
1025         if (likely(rc == -ENODATA || rc == -EINVAL)) {
1026                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1027                         GOTO(unlock, rc = 1);
1028
1029                 if (S_ISDIR(lfsck_object_type(orphan))) {
1030                         rc = dt_delete(env, orphan,
1031                                        (const struct dt_key *)dotdot, th);
1032                         if (rc != 0)
1033                                 GOTO(unlock, rc);
1034
1035                         rec->rec_type = S_IFDIR;
1036                         rec->rec_fid = pfid;
1037                         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1038                                        (const struct dt_key *)dotdot, th, 1);
1039                         if (rc != 0)
1040                                 GOTO(unlock, rc);
1041                 }
1042
1043                 rc = dt_xattr_set(env, orphan, &linkea_buf, XATTR_NAME_LINK, 0,
1044                                   th);
1045         } else {
1046                 if (rc == 0 && count != NULL)
1047                         *count = ldata2.ld_leh->leh_reccount;
1048
1049                 GOTO(unlock, rc);
1050         }
1051         dt_write_unlock(env, orphan);
1052
1053         if (rc == 0 && !exist) {
1054                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
1055                 rec->rec_fid = cfid;
1056                 rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1057                                (const struct dt_key *)cname->ln_name, th, 1);
1058                 if (rc == 0 && S_ISDIR(rec->rec_type)) {
1059                         dt_write_lock(env, parent, 0);
1060                         rc = dt_ref_add(env, parent, th);
1061                         dt_write_unlock(env, parent);
1062                 }
1063         }
1064
1065         if (rc == 0)
1066                 rc = dt_attr_set(env, orphan, la, th);
1067
1068         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1069
1070 unlock:
1071         dt_write_unlock(env, orphan);
1072
1073 stop:
1074         dt_trans_stop(env, dev, th);
1075
1076 log:
1077         lfsck_ibits_unlock(&clh, LCK_EX);
1078         lfsck_unlock(pllh);
1079         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert orphan for the "
1080                "object "DFID", name = %s: rc = %d\n",
1081                lfsck_lfsck2name(lfsck), PFID(cfid),
1082                cname->ln_name != NULL ? cname->ln_name : "<NULL>", rc);
1083
1084         if (rc != 0) {
1085                 struct lfsck_namespace *ns = com->lc_file_ram;
1086
1087                 ns->ln_flags |= LF_INCONSISTENT;
1088         }
1089
1090         return rc;
1091 }
1092
1093 /**
1094  * Add the specified name entry back to namespace.
1095  *
1096  * If there is a linkEA entry that back references a name entry under
1097  * some parent directory, but such parent directory does not have the
1098  * claimed name entry. On the other hand, the linkEA entries count is
1099  * not larger than the MDT-object's hard link count. Under such case,
1100  * it is quite possible that the name entry is lost. Then the LFSCK
1101  * should add the name entry back to the namespace.
1102  *
1103  * \param[in] env       pointer to the thread context
1104  * \param[in] com       pointer to the lfsck component
1105  * \param[in] parent    pointer to the directory under which the name entry
1106  *                      will be inserted into
1107  * \param[in] child     pointer to the object referenced by the name entry
1108  *                      that to be inserted into the parent
1109  * \param[in] name      the name for the child in the parent directory
1110  *
1111  * \retval              positive number for repaired cases
1112  * \retval              0 if nothing to be repaired
1113  * \retval              negative error number on failure
1114  */
1115 static int lfsck_namespace_insert_normal(const struct lu_env *env,
1116                                          struct lfsck_component *com,
1117                                          struct dt_object *parent,
1118                                          struct dt_object *child,
1119                                          const char *name)
1120 {
1121         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1122         struct lu_attr                  *la     = &info->lti_la;
1123         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1124         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1125         /* The child and its name may be on different MDTs. */
1126         const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
1127         const struct lu_fid             *cfid   = lfsck_dto2fid(child);
1128         struct dt_device                *dev    = lfsck->li_next;
1129         struct thandle                  *th     = NULL;
1130         struct lfsck_lock_handle        *llh    = &info->lti_llh;
1131         int                              rc     = 0;
1132         ENTRY;
1133
1134         /* @parent/@child may be based on lfsck->li_bottom,
1135          * but here we need the object based on the lfsck->li_next. */
1136
1137         parent = lfsck_object_locate(dev, parent);
1138         if (IS_ERR(parent))
1139                 GOTO(log, rc = PTR_ERR(parent));
1140
1141         if (unlikely(!dt_try_as_dir(env, parent)))
1142                 GOTO(log, rc = -ENOTDIR);
1143
1144         child = lfsck_object_locate(dev, child);
1145         if (IS_ERR(child))
1146                 GOTO(log, rc = PTR_ERR(child));
1147
1148         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1149                 GOTO(log, rc = 1);
1150
1151         rc = lfsck_lock(env, lfsck, parent, name, llh,
1152                         MDS_INODELOCK_UPDATE, LCK_PW);
1153         if (rc != 0)
1154                 GOTO(log, rc);
1155
1156         th = dt_trans_create(env, dev);
1157         if (IS_ERR(th))
1158                 GOTO(unlock, rc = PTR_ERR(th));
1159
1160         rec->rec_type = lfsck_object_type(child) & S_IFMT;
1161         rec->rec_fid = cfid;
1162         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1163                                (const struct dt_key *)name, th);
1164         if (rc != 0)
1165                 GOTO(stop, rc);
1166
1167         if (S_ISDIR(rec->rec_type)) {
1168                 rc = dt_declare_ref_add(env, parent, th);
1169                 if (rc != 0)
1170                         GOTO(stop, rc);
1171         }
1172
1173         memset(la, 0, sizeof(*la));
1174         la->la_ctime = ktime_get_real_seconds();
1175         la->la_valid = LA_CTIME;
1176         rc = dt_declare_attr_set(env, parent, la, th);
1177         if (rc != 0)
1178                 GOTO(stop, rc);
1179
1180         rc = dt_declare_attr_set(env, child, la, th);
1181         if (rc != 0)
1182                 GOTO(stop, rc);
1183
1184         rc = dt_trans_start_local(env, dev, th);
1185         if (rc != 0)
1186                 GOTO(stop, rc);
1187
1188         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1189                        (const struct dt_key *)name, th, 1);
1190         if (rc != 0)
1191                 GOTO(stop, rc);
1192
1193         if (S_ISDIR(rec->rec_type)) {
1194                 dt_write_lock(env, parent, 0);
1195                 rc = dt_ref_add(env, parent, th);
1196                 dt_write_unlock(env, parent);
1197                 if (rc != 0)
1198                         GOTO(stop, rc);
1199         }
1200
1201         la->la_ctime = ktime_get_real_seconds();
1202         rc = dt_attr_set(env, parent, la, th);
1203         if (rc != 0)
1204                 GOTO(stop, rc);
1205
1206         rc = dt_attr_set(env, child, la, th);
1207
1208         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1209
1210 stop:
1211         dt_trans_stop(env, dev, th);
1212
1213 unlock:
1214         lfsck_unlock(llh);
1215
1216 log:
1217         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert object "DFID" with "
1218                "the name %s and type %o to the parent "DFID": rc = %d\n",
1219                lfsck_lfsck2name(lfsck), PFID(cfid), name,
1220                lfsck_object_type(child) & S_IFMT, PFID(pfid), rc);
1221
1222         if (rc != 0) {
1223                 struct lfsck_namespace *ns = com->lc_file_ram;
1224
1225                 ns->ln_flags |= LF_INCONSISTENT;
1226                 if (rc > 0)
1227                         ns->ln_lost_dirent_repaired++;
1228         }
1229
1230         return rc;
1231 }
1232
1233 /**
1234  * Create the specified orphan directory.
1235  *
1236  * For the case that the parent MDT-object stored in some MDT-object's
1237  * linkEA entry is lost, the LFSCK will re-create the parent object as
1238  * an orphan and insert it into .lustre/lost+found/MDTxxxx/ directory
1239  * with the name ${FID}-P-${conflict_version}.
1240  *
1241  * \param[in] env       pointer to the thread context
1242  * \param[in] com       pointer to the lfsck component
1243  * \param[in] orphan    pointer to the orphan MDT-object to be created
1244  * \param[in] lmv       pointer to master LMV EA that will be set to the orphan
1245  *
1246  * \retval              positive number for repaired cases
1247  * \retval              negative error number on failure
1248  */
1249 static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
1250                                              struct lfsck_component *com,
1251                                              struct dt_object *orphan,
1252                                              struct lmv_mds_md_v1 *lmv)
1253 {
1254         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1255         struct lu_attr                  *la     = &info->lti_la;
1256         struct dt_allocation_hint       *hint   = &info->lti_hint;
1257         struct dt_object_format         *dof    = &info->lti_dof;
1258         struct lu_name                  *cname  = &info->lti_name2;
1259         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1260         struct lmv_mds_md_v1            *lmv2   = &info->lti_lmv2;
1261         const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
1262         struct lu_fid                    tfid;
1263         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1264         struct lfsck_namespace          *ns     = com->lc_file_ram;
1265         struct dt_device                *dev    = lfsck_obj2dev(orphan);
1266         struct dt_object                *parent = NULL;
1267         struct thandle                  *th     = NULL;
1268         struct lfsck_lock_handle        *llh    = &info->lti_llh;
1269         struct linkea_data               ldata  = { NULL };
1270         struct lu_buf                    linkea_buf;
1271         struct lu_buf                    lmv_buf;
1272         char                             name[32];
1273         int                              namelen;
1274         int                              idx    = 0;
1275         int                              rc     = 0;
1276         int                              rc1    = 0;
1277         ENTRY;
1278
1279         LASSERT(!dt_object_exists(orphan));
1280
1281         cname->ln_name = NULL;
1282         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1283                 GOTO(log, rc = 1);
1284
1285         if (dt_object_remote(orphan)) {
1286                 LASSERT(lfsck->li_lpf_root_obj != NULL);
1287
1288                 idx = lfsck_find_mdt_idx_by_fid(env, lfsck, cfid);
1289                 if (idx < 0)
1290                         GOTO(log, rc = idx);
1291
1292                 snprintf(name, 8, "MDT%04x", idx);
1293                 rc = dt_lookup(env, lfsck->li_lpf_root_obj,
1294                                (struct dt_rec *)&tfid,
1295                                (const struct dt_key *)name);
1296                 if (rc != 0)
1297                         GOTO(log, rc = (rc == -ENOENT ? -ENXIO : rc));
1298
1299                 parent = lfsck_object_find_bottom(env, lfsck, &tfid);
1300                 if (IS_ERR(parent))
1301                         GOTO(log, rc = PTR_ERR(parent));
1302
1303                 if (unlikely(!dt_try_as_dir(env, parent)))
1304                         GOTO(log, rc = -ENOTDIR);
1305         } else {
1306                 if (unlikely(lfsck->li_lpf_obj == NULL))
1307                         GOTO(log, rc = -ENXIO);
1308
1309                 parent = lfsck->li_lpf_obj;
1310         }
1311
1312         dev = lfsck_find_dev_by_fid(env, lfsck, cfid);
1313         if (IS_ERR(dev))
1314                 GOTO(log, rc = PTR_ERR(dev));
1315
1316         idx = 0;
1317
1318 again:
1319         do {
1320                 namelen = snprintf(name, 31, DFID"-P-%d",
1321                                    PFID(cfid), idx++);
1322                 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
1323                                (const struct dt_key *)name);
1324                 if (rc != 0 && rc != -ENOENT)
1325                         GOTO(log, rc);
1326         } while (rc == 0);
1327
1328         rc = lfsck_lock(env, lfsck, parent, name, llh,
1329                         MDS_INODELOCK_UPDATE, LCK_PW);
1330         if (rc != 0)
1331                 GOTO(log, rc);
1332
1333         /* Re-check whether the name conflict with othrs after taken
1334          * the ldlm lock. */
1335         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
1336                        (const struct dt_key *)name);
1337         if (unlikely(rc == 0)) {
1338                 lfsck_unlock(llh);
1339                 goto again;
1340         }
1341
1342         if (rc != -ENOENT)
1343                 GOTO(unlock1, rc);
1344
1345         cname->ln_name = name;
1346         cname->ln_namelen = namelen;
1347
1348         memset(la, 0, sizeof(*la));
1349         la->la_mode = S_IFDIR | 0700;
1350         la->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
1351                        LA_ATIME | LA_MTIME | LA_CTIME;
1352
1353         orphan->do_ops->do_ah_init(env, hint, parent, orphan,
1354                                    la->la_mode & S_IFMT);
1355
1356         memset(dof, 0, sizeof(*dof));
1357         dof->dof_type = dt_mode_to_dft(S_IFDIR);
1358
1359         rc = linkea_links_new(&ldata, &info->lti_linkea_buf2,
1360                               cname, lfsck_dto2fid(parent));
1361         if (rc != 0)
1362                 GOTO(unlock1, rc);
1363
1364         th = dt_trans_create(env, dev);
1365         if (IS_ERR(th))
1366                 GOTO(unlock1, rc = PTR_ERR(th));
1367
1368         /* Sync the remote transaction to guarantee that the subsequent
1369          * lock against the @orphan can find the @orphan in time. */
1370         if (dt_object_remote(orphan))
1371                 th->th_sync = 1;
1372
1373         rc = dt_declare_create(env, orphan, la, hint, dof, th);
1374         if (rc != 0)
1375                 GOTO(stop, rc);
1376
1377         if (unlikely(!dt_try_as_dir(env, orphan)))
1378                 GOTO(stop, rc = -ENOTDIR);
1379
1380         rc = dt_declare_ref_add(env, orphan, th);
1381         if (rc != 0)
1382                 GOTO(stop, rc);
1383
1384         rec->rec_type = S_IFDIR;
1385         rec->rec_fid = cfid;
1386         rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
1387                                (const struct dt_key *)dot, th);
1388         if (rc != 0)
1389                 GOTO(stop, rc);
1390
1391         rec->rec_fid = lfsck_dto2fid(parent);
1392         rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
1393                                (const struct dt_key *)dotdot, th);
1394         if (rc != 0)
1395                 GOTO(stop, rc);
1396
1397         if (lmv != NULL) {
1398                 lmv->lmv_magic = LMV_MAGIC;
1399                 lmv->lmv_master_mdt_index = lfsck_dev_idx(lfsck);
1400                 lfsck_lmv_header_cpu_to_le(lmv2, lmv);
1401                 lfsck_buf_init(&lmv_buf, lmv2, sizeof(*lmv2));
1402                 rc = dt_declare_xattr_set(env, orphan, &lmv_buf,
1403                                           XATTR_NAME_LMV, 0, th);
1404                 if (rc != 0)
1405                         GOTO(stop, rc);
1406         }
1407
1408         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
1409                        ldata.ld_leh->leh_len);
1410         rc = dt_declare_xattr_set(env, orphan, &linkea_buf,
1411                                   XATTR_NAME_LINK, 0, th);
1412         if (rc != 0)
1413                 GOTO(stop, rc);
1414
1415         rec->rec_fid = cfid;
1416         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1417                                (const struct dt_key *)name, th);
1418         if (rc == 0)
1419                 rc = dt_declare_ref_add(env, parent, th);
1420
1421         if (rc != 0)
1422                 GOTO(stop, rc);
1423
1424         rc = dt_trans_start_local(env, dev, th);
1425         if (rc != 0)
1426                 GOTO(stop, rc);
1427
1428         dt_write_lock(env, orphan, 0);
1429         rc = dt_create(env, orphan, la, hint, dof, th);
1430         if (rc != 0)
1431                 GOTO(unlock2, rc);
1432
1433         rc = dt_ref_add(env, orphan, th);
1434         if (rc != 0)
1435                 GOTO(unlock2, rc);
1436
1437         rec->rec_fid = cfid;
1438         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1439                        (const struct dt_key *)dot, th, 1);
1440         if (rc != 0)
1441                 GOTO(unlock2, rc);
1442
1443         rec->rec_fid = lfsck_dto2fid(parent);
1444         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1445                        (const struct dt_key *)dotdot, th, 1);
1446         if (rc != 0)
1447                 GOTO(unlock2, rc);
1448
1449         if (lmv != NULL) {
1450                 rc = dt_xattr_set(env, orphan, &lmv_buf, XATTR_NAME_LMV, 0, th);
1451                 if (rc != 0)
1452                         GOTO(unlock2, rc);
1453         }
1454
1455         rc = dt_xattr_set(env, orphan, &linkea_buf,
1456                           XATTR_NAME_LINK, 0, th);
1457         dt_write_unlock(env, orphan);
1458         if (rc != 0)
1459                 GOTO(stop, rc);
1460
1461         rec->rec_fid = cfid;
1462         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1463                        (const struct dt_key *)name, th, 1);
1464         if (rc == 0) {
1465                 dt_write_lock(env, parent, 0);
1466                 rc = dt_ref_add(env, parent, th);
1467                 dt_write_unlock(env, parent);
1468         }
1469
1470         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1471
1472 unlock2:
1473         dt_write_unlock(env, orphan);
1474
1475 stop:
1476         rc1 = dt_trans_stop(env, dev, th);
1477         if (rc1 != 0 && rc > 0)
1478                 rc = rc1;
1479
1480 unlock1:
1481         lfsck_unlock(llh);
1482
1483 log:
1484         CDEBUG(D_LFSCK, "%s: namespace LFSCK create orphan dir for "
1485                "the object "DFID", name = %s: rc = %d\n",
1486                lfsck_lfsck2name(lfsck), PFID(cfid),
1487                cname->ln_name != NULL ? cname->ln_name : "<NULL>", rc);
1488
1489         if (parent != NULL && !IS_ERR(parent) && parent != lfsck->li_lpf_obj)
1490                 lfsck_object_put(env, parent);
1491
1492         if (rc != 0)
1493                 ns->ln_flags |= LF_INCONSISTENT;
1494
1495         return rc;
1496 }
1497
1498 /**
1499  * Remove the specified entry from the linkEA.
1500  *
1501  * Locate the linkEA entry with the given @cname and @pfid, then
1502  * remove this entry or the other entries those are repeated with
1503  * this entry.
1504  *
1505  * \param[in] env       pointer to the thread context
1506  * \param[in] com       pointer to the lfsck component
1507  * \param[in] obj       pointer to the dt_object to be handled
1508  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
1509  * \param[in] cname     the name for the child in the parent directory
1510  * \param[in] pfid      the parent directory's FID for the linkEA
1511  * \param[in] next      if true, then remove the first found linkEA
1512  *                      entry, and move the ldata->ld_lee to next entry
1513  *
1514  * \retval              positive number for repaired cases
1515  * \retval              0 if nothing to be repaired
1516  * \retval              negative error number on failure
1517  */
1518 static int lfsck_namespace_shrink_linkea(const struct lu_env *env,
1519                                          struct lfsck_component *com,
1520                                          struct dt_object *obj,
1521                                          struct linkea_data *ldata,
1522                                          struct lu_name *cname,
1523                                          struct lu_fid *pfid,
1524                                          bool next)
1525 {
1526         struct lfsck_instance           *lfsck     = com->lc_lfsck;
1527         struct dt_device                *dev       = lfsck_obj2dev(obj);
1528         struct lfsck_bookmark           *bk        = &lfsck->li_bookmark_ram;
1529         struct thandle                  *th        = NULL;
1530         struct lustre_handle             lh        = { 0 };
1531         struct linkea_data               ldata_new = { NULL };
1532         struct lu_buf                    linkea_buf;
1533         int                              buflen    = 0;
1534         int                              rc        = 0;
1535         ENTRY;
1536
1537         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
1538                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
1539                               LCK_EX);
1540         if (rc != 0)
1541                 GOTO(log, rc);
1542
1543         if (next)
1544                 lfsck_linkea_del_buf(ldata, cname);
1545         else
1546                 lfsck_namespace_filter_linkea_entry(ldata, cname, pfid,
1547                                                     true);
1548         if (ldata->ld_leh->leh_reccount > 0 ||
1549             unlikely(ldata->ld_leh->leh_overflow_time)) {
1550                 lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
1551                                ldata->ld_leh->leh_len);
1552                 buflen = linkea_buf.lb_len;
1553         }
1554
1555 again:
1556         th = dt_trans_create(env, dev);
1557         if (IS_ERR(th))
1558                 GOTO(unlock1, rc = PTR_ERR(th));
1559
1560         if (buflen != 0)
1561                 rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1562                                           XATTR_NAME_LINK, 0, th);
1563         else
1564                 rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, th);
1565         if (rc != 0)
1566                 GOTO(stop, rc);
1567
1568         rc = dt_trans_start_local(env, dev, th);
1569         if (rc != 0)
1570                 GOTO(stop, rc);
1571
1572         dt_write_lock(env, obj, 0);
1573         if (unlikely(lfsck_is_dead_obj(obj)))
1574                 GOTO(unlock2, rc = -ENOENT);
1575
1576         rc = lfsck_links_read2_with_rec(env, obj, &ldata_new);
1577         if (rc)
1578                 GOTO(unlock2, rc = (rc == -ENODATA ? 0 : rc));
1579
1580         /* The specified linkEA entry has been removed by race. */
1581         rc = linkea_links_find(&ldata_new, cname, pfid);
1582         if (rc != 0)
1583                 GOTO(unlock2, rc = 0);
1584
1585         if (bk->lb_param & LPF_DRYRUN)
1586                 GOTO(unlock2, rc = 1);
1587
1588         if (next)
1589                 lfsck_linkea_del_buf(&ldata_new, cname);
1590         else
1591                 lfsck_namespace_filter_linkea_entry(&ldata_new, cname, pfid,
1592                                                     true);
1593
1594         if (buflen < ldata_new.ld_leh->leh_len) {
1595                 dt_write_unlock(env, obj);
1596                 dt_trans_stop(env, dev, th);
1597                 lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
1598                                ldata_new.ld_leh->leh_len);
1599                 goto again;
1600         }
1601
1602         if (ldata_new.ld_leh->leh_reccount > 0 ||
1603             unlikely(ldata->ld_leh->leh_overflow_time))
1604                 rc = lfsck_links_write(env, obj, &ldata_new, th);
1605         else
1606                 rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, th);
1607
1608         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
1609
1610 unlock2:
1611         dt_write_unlock(env, obj);
1612
1613 stop:
1614         dt_trans_stop(env, dev, th);
1615
1616 unlock1:
1617         lfsck_ibits_unlock(&lh, LCK_EX);
1618
1619 log:
1620         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove %s linkEA entry "
1621                "for the object: "DFID", parent "DFID", name %.*s\n",
1622                lfsck_lfsck2name(lfsck), next ? "invalid" : "redundant",
1623                PFID(lfsck_dto2fid(obj)), PFID(pfid), cname->ln_namelen,
1624                cname->ln_name);
1625
1626         if (rc != 0) {
1627                 struct lfsck_namespace *ns = com->lc_file_ram;
1628
1629                 ns->ln_flags |= LF_INCONSISTENT;
1630         }
1631
1632         return rc;
1633 }
1634
1635 /**
1636  * Conditionally remove the specified entry from the linkEA.
1637  *
1638  * Take the parent lock firstly, then check whether the specified
1639  * name entry exists or not: if yes, do nothing; otherwise, call
1640  * lfsck_namespace_shrink_linkea() to remove the linkea entry.
1641  *
1642  * \param[in] env       pointer to the thread context
1643  * \param[in] com       pointer to the lfsck component
1644  * \param[in] parent    pointer to the parent directory
1645  * \param[in] child     pointer to the child object that holds the linkEA
1646  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
1647  * \param[in] cname     the name for the child in the parent directory
1648  * \param[in] pfid      the parent directory's FID for the linkEA
1649  *
1650  * \retval              positive number for repaired cases
1651  * \retval              0 if nothing to be repaired
1652  * \retval              negative error number on failure
1653  */
1654 static int lfsck_namespace_shrink_linkea_cond(const struct lu_env *env,
1655                                               struct lfsck_component *com,
1656                                               struct dt_object *parent,
1657                                               struct dt_object *child,
1658                                               struct linkea_data *ldata,
1659                                               struct lu_name *cname,
1660                                               struct lu_fid *pfid)
1661 {
1662         struct lfsck_thread_info *info  = lfsck_env_info(env);
1663         struct lu_fid            *cfid  = &info->lti_fid3;
1664         struct lfsck_lock_handle *llh   = &info->lti_llh;
1665         int                       rc;
1666         ENTRY;
1667
1668         rc = lfsck_lock(env, com->lc_lfsck, parent, cname->ln_name, llh,
1669                         MDS_INODELOCK_UPDATE, LCK_PR);
1670         if (rc != 0)
1671                 RETURN(rc);
1672
1673         dt_read_lock(env, parent, 0);
1674         if (unlikely(lfsck_is_dead_obj(parent))) {
1675                 dt_read_unlock(env, parent);
1676                 lfsck_unlock(llh);
1677                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1678                                                    cname, pfid, true);
1679
1680                 RETURN(rc);
1681         }
1682
1683         rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
1684                        (const struct dt_key *)cname->ln_name);
1685         dt_read_unlock(env, parent);
1686
1687         /* It is safe to release the ldlm lock, because when the logic come
1688          * here, we have got all the needed information above whether the
1689          * linkEA entry is valid or not. It is not important that others
1690          * may add new linkEA entry after the ldlm lock released. If other
1691          * has removed the specified linkEA entry by race, then it is OK,
1692          * because the subsequent lfsck_namespace_shrink_linkea() can handle
1693          * such case. */
1694         lfsck_unlock(llh);
1695         if (rc == -ENOENT) {
1696                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1697                                                    cname, pfid, true);
1698
1699                 RETURN(rc);
1700         }
1701
1702         if (rc != 0)
1703                 RETURN(rc);
1704
1705         /* The LFSCK just found some internal status of cross-MDTs
1706          * create operation. That is normal. */
1707         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
1708                 linkea_next_entry(ldata);
1709
1710                 RETURN(0);
1711         }
1712
1713         rc = lfsck_namespace_shrink_linkea(env, com, child, ldata, cname,
1714                                            pfid, true);
1715
1716         RETURN(rc);
1717 }
1718
1719 /**
1720  * Conditionally replace name entry in the parent.
1721  *
1722  * As required, the LFSCK may re-create the lost MDT-object for dangling
1723  * name entry, but such repairing may be wrong because of bad FID in the
1724  * name entry. As the LFSCK processing, the real MDT-object may be found,
1725  * then the LFSCK should check whether the former re-created MDT-object
1726  * has been modified or not, if not, then destroy it and update the name
1727  * entry in the parent to reference the real MDT-object.
1728  *
1729  * \param[in] env       pointer to the thread context
1730  * \param[in] com       pointer to the lfsck component
1731  * \param[in] parent    pointer to the parent directory
1732  * \param[in] child     pointer to the MDT-object that may be the real
1733  *                      MDT-object corresponding to the name entry in parent
1734  * \param[in] cfid      the current FID in the name entry
1735  * \param[in] cname     contains the name of the child in the parent directory
1736  *
1737  * \retval              positive number for repaired cases
1738  * \retval              0 if nothing to be repaired
1739  * \retval              negative error number on failure
1740  */
1741 static int lfsck_namespace_replace_cond(const struct lu_env *env,
1742                                         struct lfsck_component *com,
1743                                         struct dt_object *parent,
1744                                         struct dt_object *child,
1745                                         const struct lu_fid *cfid,
1746                                         const struct lu_name *cname)
1747 {
1748         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1749         struct lu_attr                  *la     = &info->lti_la;
1750         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1751         struct lu_fid                    tfid;
1752         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1753         /* The child and its name may be on different MDTs. */
1754         struct dt_device                *dev    = lfsck->li_next;
1755         const char                      *name   = cname->ln_name;
1756         const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
1757         struct dt_object                *cobj   = NULL;
1758         struct lfsck_lock_handle        *pllh   = &info->lti_llh;
1759         struct lustre_handle             clh    = { 0 };
1760         struct linkea_data               ldata  = { NULL };
1761         struct thandle                  *th     = NULL;
1762         bool                             exist  = true;
1763         int                              rc     = 0;
1764         ENTRY;
1765
1766         /* @parent/@child may be based on lfsck->li_bottom,
1767          * but here we need the object based on the lfsck->li_next. */
1768
1769         parent = lfsck_object_locate(dev, parent);
1770         if (IS_ERR(parent))
1771                 GOTO(log, rc = PTR_ERR(parent));
1772
1773         if (unlikely(!dt_try_as_dir(env, parent)))
1774                 GOTO(log, rc = -ENOTDIR);
1775
1776         rc = lfsck_lock(env, lfsck, parent, name, pllh,
1777                         MDS_INODELOCK_UPDATE, LCK_PW);
1778         if (rc != 0)
1779                 GOTO(log, rc);
1780
1781         if (!fid_is_sane(cfid)) {
1782                 exist = false;
1783                 goto replace;
1784         }
1785
1786         cobj = lfsck_object_find_by_dev(env, dev, cfid);
1787         if (IS_ERR(cobj)) {
1788                 rc = PTR_ERR(cobj);
1789                 if (rc == -ENOENT) {
1790                         exist = false;
1791                         goto replace;
1792                 }
1793
1794                 GOTO(log, rc);
1795         }
1796
1797         if (!dt_object_exists(cobj)) {
1798                 exist = false;
1799                 goto replace;
1800         }
1801
1802         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
1803                        (const struct dt_key *)name);
1804         if (rc == -ENOENT) {
1805                 exist = false;
1806                 goto replace;
1807         }
1808
1809         if (rc != 0)
1810                 GOTO(log, rc);
1811
1812         /* Someone changed the name entry, cannot replace it. */
1813         if (!lu_fid_eq(cfid, &tfid))
1814                 GOTO(log, rc = 0);
1815
1816         /* lock the object to be destroyed. */
1817         rc = lfsck_ibits_lock(env, lfsck, cobj, &clh,
1818                               MDS_INODELOCK_UPDATE |
1819                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
1820                               LCK_EX);
1821         if (rc != 0)
1822                 GOTO(log, rc);
1823
1824         if (unlikely(lfsck_is_dead_obj(cobj))) {
1825                 exist = false;
1826                 goto replace;
1827         }
1828
1829         rc = dt_attr_get(env, cobj, la);
1830         if (rc != 0)
1831                 GOTO(log, rc);
1832
1833         /* The object has been modified by other(s), or it is not created by
1834          * LFSCK, the two cases are indistinguishable. So cannot replace it. */
1835         if (la->la_ctime != 0)
1836                 GOTO(log, rc);
1837
1838         if (S_ISREG(la->la_mode)) {
1839                 rc = dt_xattr_get(env, cobj, &LU_BUF_NULL, XATTR_NAME_LOV);
1840                 /* If someone has created related OST-object(s),
1841                  * then keep it. */
1842                 if ((rc > 0) || (rc < 0 && rc != -ENODATA))
1843                         GOTO(log, rc = (rc > 0 ? 0 : rc));
1844         }
1845
1846 replace:
1847         dt_read_lock(env, child, 0);
1848         rc = lfsck_links_read2_with_rec(env, child, &ldata);
1849         dt_read_unlock(env, child);
1850
1851         /* Someone changed the child, no need to replace. */
1852         if (rc == -ENODATA)
1853                 GOTO(log, rc = 0);
1854
1855         if (rc != 0)
1856                 GOTO(log, rc);
1857
1858         rc = linkea_links_find(&ldata, cname, pfid);
1859         /* Someone moved the child, no need to replace. */
1860         if (rc != 0)
1861                 GOTO(log, rc = 0);
1862
1863         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1864                 GOTO(log, rc = 1);
1865
1866         th = dt_trans_create(env, dev);
1867         if (IS_ERR(th))
1868                 GOTO(log, rc = PTR_ERR(th));
1869
1870         if (exist) {
1871                 rc = dt_declare_destroy(env, cobj, th);
1872                 if (rc != 0)
1873                         GOTO(stop, rc);
1874         }
1875
1876         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
1877         if (rc != 0)
1878                 GOTO(stop, rc);
1879
1880         rec->rec_type = S_IFDIR;
1881         rec->rec_fid = lfsck_dto2fid(child);
1882         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1883                                (const struct dt_key *)name, th);
1884         if (rc != 0)
1885                 GOTO(stop, rc);
1886
1887         rc = dt_trans_start_local(env, dev, th);
1888         if (rc != 0)
1889                 GOTO(stop, rc);
1890
1891         if (exist) {
1892                 rc = dt_destroy(env, cobj, th);
1893                 if (rc != 0)
1894                         GOTO(stop, rc);
1895         }
1896
1897         /* The old name entry maybe not exist. */
1898         rc = dt_delete(env, parent, (const struct dt_key *)name, th);
1899         if (rc != 0 && rc != -ENOENT)
1900                 GOTO(stop, rc);
1901
1902         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1903                        (const struct dt_key *)name, th, 1);
1904
1905         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1906
1907 stop:
1908         dt_trans_stop(env, dev, th);
1909
1910 log:
1911         lfsck_ibits_unlock(&clh, LCK_EX);
1912         lfsck_unlock(pllh);
1913
1914         if (cobj != NULL && !IS_ERR(cobj))
1915                 lfsck_object_put(env, cobj);
1916
1917         CDEBUG(D_LFSCK, "%s: namespace LFSCK conditionally destroy the "
1918                "object "DFID" because of conflict with the object "DFID
1919                " under the parent "DFID" with name %s: rc = %d\n",
1920                lfsck_lfsck2name(lfsck), PFID(cfid),
1921                PFID(lfsck_dto2fid(child)), PFID(pfid), name, rc);
1922
1923         return rc;
1924 }
1925
1926 /**
1927  * Overwrite the linkEA for the object with the given ldata.
1928  *
1929  * The caller should take the ldlm lock before the calling.
1930  *
1931  * \param[in] env       pointer to the thread context
1932  * \param[in] com       pointer to the lfsck component
1933  * \param[in] obj       pointer to the dt_object to be handled
1934  * \param[in] ldata     pointer to the new linkEA data
1935  *
1936  * \retval              positive number for repaired cases
1937  * \retval              0 if nothing to be repaired
1938  * \retval              negative error number on failure
1939  */
1940 int lfsck_namespace_rebuild_linkea(const struct lu_env *env,
1941                                    struct lfsck_component *com,
1942                                    struct dt_object *obj,
1943                                    struct linkea_data *ldata)
1944 {
1945         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1946         struct dt_device                *dev    = lfsck_obj2dev(obj);
1947         struct thandle                  *th     = NULL;
1948         struct lu_buf                    linkea_buf;
1949         int                              rc     = 0;
1950         ENTRY;
1951
1952         th = dt_trans_create(env, dev);
1953         if (IS_ERR(th))
1954                 GOTO(log, rc = PTR_ERR(th));
1955
1956         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
1957                        ldata->ld_leh->leh_len);
1958         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1959                                   XATTR_NAME_LINK, 0, th);
1960         if (rc != 0)
1961                 GOTO(stop, rc);
1962
1963         rc = dt_trans_start_local(env, dev, th);
1964         if (rc != 0)
1965                 GOTO(stop, rc);
1966
1967         dt_write_lock(env, obj, 0);
1968         if (unlikely(lfsck_is_dead_obj(obj)))
1969                 GOTO(unlock, rc = 0);
1970
1971         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1972                 GOTO(unlock, rc = 1);
1973
1974         rc = dt_xattr_set(env, obj, &linkea_buf,
1975                           XATTR_NAME_LINK, 0, th);
1976
1977         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
1978
1979 unlock:
1980         dt_write_unlock(env, obj);
1981
1982 stop:
1983         dt_trans_stop(env, dev, th);
1984
1985 log:
1986         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild linkEA for the "
1987                "object "DFID": rc = %d\n",
1988                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
1989
1990         if (rc != 0) {
1991                 struct lfsck_namespace *ns = com->lc_file_ram;
1992
1993                 ns->ln_flags |= LF_INCONSISTENT;
1994         }
1995
1996         return rc;
1997 }
1998
1999 /**
2000  * Repair invalid name entry.
2001  *
2002  * If the name entry contains invalid information, such as bad file type
2003  * or (and) corrupted object FID, then either remove the name entry or
2004  * udpate the name entry with the given (right) information.
2005  *
2006  * \param[in] env       pointer to the thread context
2007  * \param[in] com       pointer to the lfsck component
2008  * \param[in] parent    pointer to the parent directory
2009  * \param[in] child     pointer to the object referenced by the name entry
2010  * \param[in] name      the old name of the child under the parent directory
2011  * \param[in] name2     the new name of the child under the parent directory
2012  * \param[in] type      the type claimed by the name entry
2013  * \param[in] update    update the name entry if true; otherwise, remove it
2014  * \param[in] dec       decrease the parent nlink count if true
2015  *
2016  * \retval              positive number for repaired successfully
2017  * \retval              0 if nothing to be repaired
2018  * \retval              negative error number on failure
2019  */
2020 int lfsck_namespace_repair_dirent(const struct lu_env *env,
2021                                   struct lfsck_component *com,
2022                                   struct dt_object *parent,
2023                                   struct dt_object *child,
2024                                   const char *name, const char *name2,
2025                                   __u16 type, bool update, bool dec)
2026 {
2027         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2028         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
2029         const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
2030         struct lu_fid                   cfid    = {0};
2031         struct lu_fid                    tfid;
2032         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2033         struct dt_device                *dev    = lfsck->li_next;
2034         struct thandle                  *th     = NULL;
2035         struct lfsck_lock_handle        *llh    = &info->lti_llh;
2036         struct lustre_handle             lh     = { 0 };
2037         int                              rc     = 0;
2038         ENTRY;
2039
2040         if (child)
2041                 cfid = *lfsck_dto2fid(child);
2042         parent = lfsck_object_locate(dev, parent);
2043         if (IS_ERR(parent))
2044                 GOTO(log, rc = PTR_ERR(parent));
2045
2046         if (unlikely(!dt_try_as_dir(env, parent)))
2047                 GOTO(log, rc = -ENOTDIR);
2048
2049         if (!update || strcmp(name, name2) == 0)
2050                 rc = lfsck_lock(env, lfsck, parent, name, llh,
2051                                 MDS_INODELOCK_UPDATE, LCK_PW);
2052         else
2053                 rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
2054                                       MDS_INODELOCK_UPDATE, LCK_PW);
2055         if (rc != 0)
2056                 GOTO(log, rc);
2057
2058         th = dt_trans_create(env, dev);
2059         if (IS_ERR(th))
2060                 GOTO(unlock1, rc = PTR_ERR(th));
2061
2062         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
2063         if (rc != 0)
2064                 GOTO(stop, rc);
2065
2066         if (update) {
2067                 rec->rec_type = lfsck_object_type(child) & S_IFMT;
2068                 LASSERT(!fid_is_zero(&cfid));
2069                 rec->rec_fid = &cfid;
2070                 rc = dt_declare_insert(env, parent,
2071                                        (const struct dt_rec *)rec,
2072                                        (const struct dt_key *)name2, th);
2073                 if (rc != 0)
2074                         GOTO(stop, rc);
2075         }
2076
2077         if (dec && S_ISDIR(type)) {
2078                 rc = dt_declare_ref_del(env, parent, th);
2079                 if (rc != 0)
2080                         GOTO(stop, rc);
2081         }
2082
2083         rc = dt_trans_start_local(env, dev, th);
2084         if (rc != 0)
2085                 GOTO(stop, rc);
2086
2087
2088         dt_write_lock(env, parent, 0);
2089         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
2090                        (const struct dt_key *)name);
2091         /* Someone has removed the bad name entry by race. */
2092         if (rc == -ENOENT)
2093                 GOTO(unlock2, rc = 0);
2094
2095         if (rc != 0)
2096                 GOTO(unlock2, rc);
2097
2098         /* Someone has removed the bad name entry and reused it for other
2099          * object by race. */
2100         if (!lu_fid_eq(&tfid, &cfid))
2101                 GOTO(unlock2, rc = 0);
2102
2103         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2104                 GOTO(unlock2, rc = 1);
2105
2106         rc = dt_delete(env, parent, (const struct dt_key *)name, th);
2107         if (rc != 0)
2108                 GOTO(unlock2, rc);
2109
2110         if (update) {
2111                 rc = dt_insert(env, parent,
2112                                (const struct dt_rec *)rec,
2113                                (const struct dt_key *)name2, th, 1);
2114                 if (rc != 0)
2115                         GOTO(unlock2, rc);
2116         }
2117
2118         if (dec && S_ISDIR(type)) {
2119                 rc = dt_ref_del(env, parent, th);
2120                 if (rc != 0)
2121                         GOTO(unlock2, rc);
2122         }
2123
2124         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
2125
2126 unlock2:
2127         dt_write_unlock(env, parent);
2128
2129 stop:
2130         dt_trans_stop(env, dev, th);
2131
2132         /* We are not sure whether the child will become orphan or not.
2133          * Record it in the LFSCK trace file for further checking in
2134          * the second-stage scanning. */
2135         if (!update && !dec && child && rc == 0)
2136                 lfsck_namespace_trace_update(env, com, &cfid,
2137                                              LNTF_CHECK_LINKEA, true);
2138
2139 unlock1:
2140         /* It is harmless even if unlock the unused lock_handle */
2141         lfsck_ibits_unlock(&lh, LCK_PW);
2142         lfsck_unlock(llh);
2143
2144 log:
2145         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found bad name "
2146                "entry for: parent "DFID", child "DFID", name %s, type "
2147                "in name entry %o, type claimed by child %o. repair it "
2148                "by %s with new name2 %s: rc = %d\n",
2149                lfsck_lfsck2name(lfsck), PFID(pfid), PFID(&cfid),
2150                name, type, update ? lfsck_object_type(child) : 0,
2151                update ? "updating" : "removing", name2, rc);
2152
2153         if (rc != 0) {
2154                 struct lfsck_namespace *ns = com->lc_file_ram;
2155
2156                 ns->ln_flags |= LF_INCONSISTENT;
2157         }
2158
2159         return rc;
2160 }
2161
2162 /**
2163  * Update the ".." name entry for the given object.
2164  *
2165  * The object's ".." is corrupted, this function will update the ".." name
2166  * entry with the given pfid, and the linkEA with the given ldata.
2167  *
2168  * The caller should take the ldlm lock before the calling.
2169  *
2170  * \param[in] env       pointer to the thread context
2171  * \param[in] com       pointer to the lfsck component
2172  * \param[in] obj       pointer to the dt_object to be handled
2173  * \param[in] pfid      the new fid for the object's ".." name entry
2174  * \param[in] cname     the name for the @obj in the parent directory
2175  *
2176  * \retval              positive number for repaired cases
2177  * \retval              0 if nothing to be repaired
2178  * \retval              negative error number on failure
2179  */
2180 static int lfsck_namespace_repair_unmatched_pairs(const struct lu_env *env,
2181                                                   struct lfsck_component *com,
2182                                                   struct dt_object *obj,
2183                                                   const struct lu_fid *pfid,
2184                                                   struct lu_name *cname)
2185 {
2186         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2187         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
2188         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2189         struct dt_device                *dev    = lfsck_obj2dev(obj);
2190         struct thandle                  *th     = NULL;
2191         struct linkea_data               ldata  = { NULL };
2192         struct lu_buf                    linkea_buf;
2193         int                              rc     = 0;
2194         ENTRY;
2195
2196         LASSERT(!dt_object_remote(obj));
2197         LASSERT(S_ISDIR(lfsck_object_type(obj)));
2198
2199         rc = linkea_links_new(&ldata, &info->lti_big_buf, cname, pfid);
2200         if (rc != 0)
2201                 GOTO(log, rc);
2202
2203         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
2204                        ldata.ld_leh->leh_len);
2205
2206         th = dt_trans_create(env, dev);
2207         if (IS_ERR(th))
2208                 GOTO(log, rc = PTR_ERR(th));
2209
2210         rc = dt_declare_delete(env, obj, (const struct dt_key *)dotdot, th);
2211         if (rc != 0)
2212                 GOTO(stop, rc);
2213
2214         rec->rec_type = S_IFDIR;
2215         rec->rec_fid = pfid;
2216         rc = dt_declare_insert(env, obj, (const struct dt_rec *)rec,
2217                                (const struct dt_key *)dotdot, th);
2218         if (rc != 0)
2219                 GOTO(stop, rc);
2220
2221         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
2222                                   XATTR_NAME_LINK, 0, th);
2223         if (rc != 0)
2224                 GOTO(stop, rc);
2225
2226         rc = dt_trans_start_local(env, dev, th);
2227         if (rc != 0)
2228                 GOTO(stop, rc);
2229
2230         dt_write_lock(env, obj, 0);
2231         if (unlikely(lfsck_is_dead_obj(obj)))
2232                 GOTO(unlock, rc = 0);
2233
2234         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2235                 GOTO(unlock, rc = 1);
2236
2237         /* The old ".." name entry maybe not exist. */
2238         dt_delete(env, obj, (const struct dt_key *)dotdot, th);
2239
2240         rc = dt_insert(env, obj, (const struct dt_rec *)rec,
2241                        (const struct dt_key *)dotdot, th, 1);
2242         if (rc != 0)
2243                 GOTO(unlock, rc);
2244
2245         rc = lfsck_links_write(env, obj, &ldata, th);
2246
2247         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2248
2249 unlock:
2250         dt_write_unlock(env, obj);
2251
2252 stop:
2253         dt_trans_stop(env, dev, th);
2254
2255 log:
2256         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild dotdot name entry for "
2257                "the object "DFID", new parent "DFID": rc = %d\n",
2258                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)),
2259                PFID(pfid), rc);
2260
2261         if (rc != 0) {
2262                 struct lfsck_namespace *ns = com->lc_file_ram;
2263
2264                 ns->ln_flags |= LF_INCONSISTENT;
2265         }
2266
2267         return rc;
2268 }
2269
2270 /**
2271  * Handle orphan @obj during Double Scan Directory.
2272  *
2273  * Remove the @obj's current (invalid) linkEA entries, and insert
2274  * it in the directory .lustre/lost+found/MDTxxxx/ with the name:
2275  * ${FID}-${PFID}-D-${conflict_version}
2276  *
2277  * The caller should take the ldlm lock before the calling.
2278  *
2279  * \param[in] env       pointer to the thread context
2280  * \param[in] com       pointer to the lfsck component
2281  * \param[in] obj       pointer to the orphan object to be handled
2282  * \param[in] pfid      the new fid for the object's ".." name entry
2283  * \param[in,out] lh    ldlm lock handler for the given @obj
2284  * \param[out] type     to tell the caller what the inconsistency is
2285  *
2286  * \retval              positive number for repaired cases
2287  * \retval              0 if nothing to be repaired
2288  * \retval              negative error number on failure
2289  */
2290 static int
2291 lfsck_namespace_dsd_orphan(const struct lu_env *env,
2292                            struct lfsck_component *com,
2293                            struct dt_object *obj,
2294                            const struct lu_fid *pfid,
2295                            struct lustre_handle *lh,
2296                            enum lfsck_namespace_inconsistency_type *type)
2297 {
2298         struct lfsck_thread_info *info = lfsck_env_info(env);
2299         struct lfsck_namespace   *ns   = com->lc_file_ram;
2300         int                       rc;
2301         ENTRY;
2302
2303         /* Remove the unrecognized linkEA. */
2304         rc = lfsck_namespace_links_remove(env, com, obj);
2305         lfsck_ibits_unlock(lh, LCK_EX);
2306         if (rc < 0 && rc != -ENODATA)
2307                 RETURN(rc);
2308
2309         *type = LNIT_MUL_REF;
2310
2311         /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT has
2312          * ever tried to verify some remote MDT-object that resides on this
2313          * MDT, but this MDT failed to respond such request. So means there
2314          * may be some remote name entry on other MDT that references this
2315          * object with another name, so we cannot know whether this linkEA
2316          * is valid or not. So keep it there and maybe resolved when next
2317          * LFSCK run. */
2318         if (ns->ln_flags & LF_INCOMPLETE)
2319                 RETURN(0);
2320
2321         /* The unique linkEA is invalid, even if the ".." name entry may be
2322          * valid, we still cannot know via which name entry this directory
2323          * will be referenced. Then handle it as pure orphan. */
2324         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2325                  "-"DFID, PFID(pfid));
2326         rc = lfsck_namespace_insert_orphan(env, com, obj,
2327                                            info->lti_tmpbuf, "D", NULL);
2328
2329         RETURN(rc);
2330 }
2331
2332 /**
2333  * Double Scan Directory object for single linkEA entry case.
2334  *
2335  * The given @child has unique linkEA entry. If the linkEA entry is valid,
2336  * then check whether the name is in the namespace or not, if not, add the
2337  * missing name entry back to namespace. If the linkEA entry is invalid,
2338  * then remove it and insert the @child in the .lustre/lost+found/MDTxxxx/
2339  * as an orphan.
2340  *
2341  * \param[in] env       pointer to the thread context
2342  * \param[in] com       pointer to the lfsck component
2343  * \param[in] child     pointer to the directory to be double scanned
2344  * \param[in] pfid      the FID corresponding to the ".." entry
2345  * \param[in] ldata     pointer to the linkEA data for the given @child
2346  * \param[in,out] lh    ldlm lock handler for the given @child
2347  * \param[out] type     to tell the caller what the inconsistency is
2348  * \param[in] retry     if found inconsistency, but the caller does not hold
2349  *                      ldlm lock on the @child, then set @retry as true
2350  * \param[in] unknown   set if does not know how to repair the inconsistency
2351  *
2352  * \retval              positive number for repaired cases
2353  * \retval              0 if nothing to be repaired
2354  * \retval              negative error number on failure
2355  */
2356 static int
2357 lfsck_namespace_dsd_single(const struct lu_env *env,
2358                            struct lfsck_component *com,
2359                            struct dt_object *child,
2360                            const struct lu_fid *pfid,
2361                            struct linkea_data *ldata,
2362                            struct lustre_handle *lh,
2363                            enum lfsck_namespace_inconsistency_type *type,
2364                            bool *retry, bool *unknown)
2365 {
2366         struct lfsck_thread_info *info          = lfsck_env_info(env);
2367         struct lu_name           *cname         = &info->lti_name;
2368         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2369         struct lu_fid             tfid;
2370         struct lfsck_namespace   *ns            = com->lc_file_ram;
2371         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2372         struct dt_object         *parent        = NULL;
2373         struct lmv_mds_md_v1     *lmv;
2374         int                       rc            = 0;
2375         ENTRY;
2376
2377         rc = lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid,
2378                                                  info->lti_key,
2379                                                  sizeof(info->lti_key));
2380         /* The unique linkEA entry with bad parent will be handled as orphan. */
2381         if (rc != 0) {
2382                 if (!lustre_handle_is_used(lh) && retry != NULL)
2383                         *retry = true;
2384                 else
2385                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2386                                                         pfid, lh, type);
2387
2388                 GOTO(out, rc);
2389         }
2390
2391         parent = lfsck_object_find_bottom(env, lfsck, &tfid);
2392         if (IS_ERR(parent))
2393                 GOTO(out, rc = PTR_ERR(parent));
2394
2395         /* We trust the unique linkEA entry in spite of whether it matches the
2396          * ".." name entry or not. Because even if the linkEA entry is wrong
2397          * and the ".." name entry is right, we still cannot know via which
2398          * name entry the child will be referenced, since all known entries
2399          * have been verified during the first-stage scanning. */
2400         if (!dt_object_exists(parent)) {
2401                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT
2402                  * has ever tried to verify some remote MDT-object that resides
2403                  * on this MDT, but this MDT failed to respond such request. So
2404                  * means there may be some remote name entry on other MDT that
2405                  * references this object with another name, so we cannot know
2406                  * whether this linkEA is valid or not. So keep it there and
2407                  * maybe resolved when next LFSCK run. */
2408                 if (ns->ln_flags & LF_INCOMPLETE)
2409                         GOTO(out, rc = 0);
2410
2411                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2412                         *retry = true;
2413
2414                         GOTO(out, rc = 0);
2415                 }
2416
2417                 lfsck_ibits_unlock(lh, LCK_EX);
2418
2419 lost_parent:
2420                 lmv = &info->lti_lmv;
2421                 rc = lfsck_read_stripe_lmv(env, child, lmv);
2422                 if (rc != 0 && rc != -ENODATA)
2423                         GOTO(out, rc);
2424
2425                 if (rc == -ENODATA || lmv->lmv_magic != LMV_MAGIC_STRIPE) {
2426                         lmv = NULL;
2427                 } else if (lfsck_shard_name_to_index(env,
2428                                         cname->ln_name, cname->ln_namelen,
2429                                         S_IFDIR, cfid) < 0) {
2430                         /* It is an invalid name entry, we
2431                          * cannot trust the parent also. */
2432                         rc = lfsck_namespace_shrink_linkea(env, com, child,
2433                                                 ldata, cname, &tfid, true);
2434                         if (rc < 0)
2435                                 GOTO(out, rc);
2436
2437                         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2438                                  "-"DFID, PFID(pfid));
2439                         rc = lfsck_namespace_insert_orphan(env, com, child,
2440                                                 info->lti_tmpbuf, "S", NULL);
2441
2442                         GOTO(out, rc);
2443                 }
2444
2445                 /* Create the lost parent as an orphan. */
2446                 rc = lfsck_namespace_create_orphan_dir(env, com, parent, lmv);
2447                 if (rc >= 0) {
2448                         /* Add the missing name entry to the parent. */
2449                         rc = lfsck_namespace_insert_normal(env, com, parent,
2450                                                         child, cname->ln_name);
2451                         if (unlikely(rc == -EEXIST)) {
2452                                 /* Unfortunately, someone reused the name
2453                                  * under the parent by race. So we have
2454                                  * to remove the linkEA entry from
2455                                  * current child object. It means that the
2456                                  * LFSCK cannot recover the system
2457                                  * totally back to its original status,
2458                                  * but it is necessary to make the
2459                                  * current system to be consistent. */
2460                                 rc = lfsck_namespace_shrink_linkea(env,
2461                                                 com, child, ldata,
2462                                                 cname, &tfid, true);
2463                                 if (rc >= 0) {
2464                                         snprintf(info->lti_tmpbuf,
2465                                                  sizeof(info->lti_tmpbuf),
2466                                                  "-"DFID, PFID(pfid));
2467                                         rc = lfsck_namespace_insert_orphan(env,
2468                                                 com, child, info->lti_tmpbuf,
2469                                                 "D", NULL);
2470                                 }
2471                         }
2472                 }
2473
2474                 GOTO(out, rc);
2475         } /* !dt_object_exists(parent) */
2476
2477         /* The unique linkEA entry with bad parent will be handled as orphan. */
2478         if (unlikely(!dt_try_as_dir(env, parent))) {
2479                 if (!lustre_handle_is_used(lh) && retry != NULL)
2480                         *retry = true;
2481                 else
2482                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2483                                                         pfid, lh, type);
2484
2485                 GOTO(out, rc);
2486         }
2487
2488         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
2489                        (const struct dt_key *)cname->ln_name);
2490         if (rc == -ENOENT) {
2491                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT
2492                  * has ever tried to verify some remote MDT-object that resides
2493                  * on this MDT, but this MDT failed to respond such request. So
2494                  * means there may be some remote name entry on other MDT that
2495                  * references this object with another name, so we cannot know
2496                  * whether this linkEA is valid or not. So keep it there and
2497                  * maybe resolved when next LFSCK run. */
2498                 if (ns->ln_flags & LF_INCOMPLETE)
2499                         GOTO(out, rc = 0);
2500
2501                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2502                         *retry = true;
2503
2504                         GOTO(out, rc = 0);
2505                 }
2506
2507                 lfsck_ibits_unlock(lh, LCK_EX);
2508                 rc = lfsck_namespace_check_name(env, parent, child, cname);
2509                 if (rc == -ENOENT)
2510                         goto lost_parent;
2511
2512                 if (rc < 0)
2513                         GOTO(out, rc);
2514
2515                 /* It is an invalid name entry, drop it. */
2516                 if (unlikely(rc > 0)) {
2517                         rc = lfsck_namespace_shrink_linkea(env, com, child,
2518                                                 ldata, cname, &tfid, true);
2519                         if (rc >= 0) {
2520                                 snprintf(info->lti_tmpbuf,
2521                                          sizeof(info->lti_tmpbuf),
2522                                          "-"DFID, PFID(pfid));
2523                                 rc = lfsck_namespace_insert_orphan(env, com,
2524                                         child, info->lti_tmpbuf, "D", NULL);
2525                         }
2526
2527                         GOTO(out, rc);
2528                 }
2529
2530                 /* Add the missing name entry back to the namespace. */
2531                 rc = lfsck_namespace_insert_normal(env, com, parent, child,
2532                                                    cname->ln_name);
2533                 if (unlikely(rc == -ESTALE))
2534                         /* It may happen when the remote object has been
2535                          * removed, but the local MDT is not aware of that. */
2536                         goto lost_parent;
2537
2538                 if (unlikely(rc == -EEXIST)) {
2539                         /* Unfortunately, someone reused the name under the
2540                          * parent by race. So we have to remove the linkEA
2541                          * entry from current child object. It means that the
2542                          * LFSCK cannot recover the system totally back to
2543                          * its original status, but it is necessary to make
2544                          * the current system to be consistent.
2545                          *
2546                          * It also may be because of the LFSCK found some
2547                          * internal status of create operation. Under such
2548                          * case, nothing to be done. */
2549                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
2550                                         parent, child, ldata, cname, &tfid);
2551                         if (rc >= 0) {
2552                                 snprintf(info->lti_tmpbuf,
2553                                          sizeof(info->lti_tmpbuf),
2554                                          "-"DFID, PFID(pfid));
2555                                 rc = lfsck_namespace_insert_orphan(env, com,
2556                                         child, info->lti_tmpbuf, "D", NULL);
2557                         }
2558                 }
2559
2560                 GOTO(out, rc);
2561         } /* rc == -ENOENT */
2562
2563         if (rc != 0)
2564                 GOTO(out, rc);
2565
2566         if (!lu_fid_eq(&tfid, cfid)) {
2567                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2568                         *retry = true;
2569
2570                         GOTO(out, rc = 0);
2571                 }
2572
2573                 lfsck_ibits_unlock(lh, LCK_EX);
2574                 /* The name entry references another MDT-object that
2575                  * may be created by the LFSCK for repairing dangling
2576                  * name entry. Try to replace it. */
2577                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
2578                                                   &tfid, cname);
2579                 if (rc == 0)
2580                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2581                                                         pfid, lh, type);
2582
2583                 GOTO(out, rc);
2584         }
2585
2586         /* Zero FID may because the remote directroy object has invalid linkEA,
2587          * or lost linkEA. Under such case, the LFSCK on this MDT does not know
2588          * how to repair the inconsistency, but the namespace LFSCK on the MDT
2589          * where its name entry resides may has more information (name, FID) to
2590          * repair such inconsistency. So here, keep the inconsistency to avoid
2591          * some imporper repairing. */
2592         if (fid_is_zero(pfid)) {
2593                 if (unknown)
2594                         *unknown = true;
2595
2596                 GOTO(out, rc = 0);
2597         }
2598
2599         /* The ".." name entry is wrong, update it. */
2600         if (!lu_fid_eq(pfid, lfsck_dto2fid(parent))) {
2601                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2602                         *retry = true;
2603
2604                         GOTO(out, rc = 0);
2605                 }
2606
2607                 *type = LNIT_UNMATCHED_PAIRS;
2608                 rc = lfsck_namespace_repair_unmatched_pairs(env, com, child,
2609                                                 lfsck_dto2fid(parent), cname);
2610         }
2611
2612         GOTO(out, rc);
2613
2614 out:
2615         if (parent != NULL && !IS_ERR(parent))
2616                 lfsck_object_put(env, parent);
2617
2618         return rc;
2619 }
2620
2621 /**
2622  * Double Scan Directory object for multiple linkEA entries case.
2623  *
2624  * The given @child has multiple linkEA entries. There is at most one linkEA
2625  * entry will be valid, all the others will be removed. Firstly, the function
2626  * will try to find out the linkEA entry for which the name entry exists under
2627  * the given parent (@pfid). If there is no linkEA entry that matches the given
2628  * ".." name entry, then tries to find out the first linkEA entry that both the
2629  * parent and the name entry exist to rebuild a new ".." name entry.
2630  *
2631  * \param[in] env       pointer to the thread context
2632  * \param[in] com       pointer to the lfsck component
2633  * \param[in] child     pointer to the directory to be double scanned
2634  * \param[in] pfid      the FID corresponding to the ".." entry
2635  * \param[in] ldata     pointer to the linkEA data for the given @child
2636  * \param[in,out] lh    ldlm lock handler for the given @child
2637  * \param[out] type     to tell the caller what the inconsistency is
2638  * \param[in] lpf       true if the ".." entry is under lost+found/MDTxxxx/
2639  * \param[in] unknown   set if does not know how to repair the inconsistency
2640  *
2641  * \retval              positive number for repaired cases
2642  * \retval              0 if nothing to be repaired
2643  * \retval              negative error number on failure
2644  */
2645 static int
2646 lfsck_namespace_dsd_multiple(const struct lu_env *env,
2647                              struct lfsck_component *com,
2648                              struct dt_object *child,
2649                              const struct lu_fid *pfid,
2650                              struct linkea_data *ldata,
2651                              struct lustre_handle *lh,
2652                              enum lfsck_namespace_inconsistency_type *type,
2653                              bool lpf, bool *unknown)
2654 {
2655         struct lfsck_thread_info *info          = lfsck_env_info(env);
2656         struct lu_name           *cname         = &info->lti_name;
2657         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2658         struct lu_fid            *pfid2         = &info->lti_fid3;
2659         struct lu_fid             tfid;
2660         struct lfsck_namespace   *ns            = com->lc_file_ram;
2661         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2662         struct lfsck_bookmark    *bk            = &lfsck->li_bookmark_ram;
2663         struct dt_object         *parent        = NULL;
2664         struct linkea_data        ldata_new     = { NULL };
2665         int                       dirent_count  = 0;
2666         int                       rc            = 0;
2667         bool                      once          = true;
2668         ENTRY;
2669
2670 again:
2671         while (ldata->ld_lee != NULL) {
2672                 rc = lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid,
2673                                                          info->lti_key,
2674                                                          sizeof(info->lti_key));
2675                 /* Drop invalid linkEA entry. */
2676                 if (rc != 0) {
2677                         lfsck_linkea_del_buf(ldata, cname);
2678                         continue;
2679                 }
2680
2681                 /* Drop repeated linkEA entries. */
2682                 lfsck_namespace_filter_linkea_entry(ldata, cname, &tfid, true);
2683
2684                 /* If current dotdot is the .lustre/lost+found/MDTxxxx/,
2685                  * then it is possible that: the directry object has ever
2686                  * been lost, but its name entry was there. In the former
2687                  * LFSCK run, during the first-stage scanning, the LFSCK
2688                  * found the dangling name entry, but it did not recreate
2689                  * the lost object, and when moved to the second-stage
2690                  * scanning, some children objects of the lost directory
2691                  * object were found, then the LFSCK recreated such lost
2692                  * directory object as an orphan.
2693                  *
2694                  * When the LFSCK runs again, if the dangling name is still
2695                  * there, the LFSCK should move the orphan directory object
2696                  * back to the normal namespace. */
2697                 if (!lpf && !fid_is_zero(pfid) &&
2698                     !lu_fid_eq(pfid, &tfid) && once) {
2699                         linkea_next_entry(ldata);
2700                         continue;
2701                 }
2702
2703                 parent = lfsck_object_find_bottom(env, lfsck, &tfid);
2704                 if (IS_ERR(parent))
2705                         RETURN(PTR_ERR(parent));
2706
2707                 if (!dt_object_exists(parent)) {
2708                         lfsck_object_put(env, parent);
2709                         if (ldata->ld_leh->leh_reccount > 1) {
2710                                 /* If it is NOT the last linkEA entry, then
2711                                  * there is still other chance to make the
2712                                  * child to be visible via other parent, then
2713                                  * remove this linkEA entry. */
2714                                 lfsck_linkea_del_buf(ldata, cname);
2715                                 continue;
2716                         }
2717
2718                         break;
2719                 }
2720
2721                 /* The linkEA entry with bad parent will be removed. */
2722                 if (unlikely(!dt_try_as_dir(env, parent))) {
2723                         lfsck_object_put(env, parent);
2724                         lfsck_linkea_del_buf(ldata, cname);
2725                         continue;
2726                 }
2727
2728                 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
2729                                (const struct dt_key *)cname->ln_name);
2730                 *pfid2 = *lfsck_dto2fid(parent);
2731                 if (rc == -ENOENT) {
2732                         lfsck_object_put(env, parent);
2733                         linkea_next_entry(ldata);
2734                         continue;
2735                 }
2736
2737                 if (rc != 0) {
2738                         lfsck_object_put(env, parent);
2739
2740                         RETURN(rc);
2741                 }
2742
2743                 if (lu_fid_eq(&tfid, cfid)) {
2744                         lfsck_object_put(env, parent);
2745                         /* If the parent (that is declared via linkEA entry)
2746                          * directory contains the specified child, but such
2747                          * parent does not match the dotdot name entry, then
2748                          * trust the linkEA. */
2749                         if (!fid_is_zero(pfid) && !lu_fid_eq(pfid, pfid2)) {
2750                                 *type = LNIT_UNMATCHED_PAIRS;
2751                                 rc = lfsck_namespace_repair_unmatched_pairs(env,
2752                                                 com, child, pfid2, cname);
2753
2754                                 RETURN(rc);
2755                         }
2756
2757 rebuild:
2758                         /* It is the most common case that we find the
2759                          * name entry corresponding to the linkEA entry
2760                          * that matches the ".." name entry. */
2761                         rc = linkea_links_new(&ldata_new, &info->lti_big_buf,
2762                                               cname, pfid2);
2763                         if (rc != 0)
2764                                 RETURN(rc);
2765
2766                         rc = lfsck_namespace_rebuild_linkea(env, com, child,
2767                                                             &ldata_new);
2768                         if (rc < 0)
2769                                 RETURN(rc);
2770
2771                         lfsck_linkea_del_buf(ldata, cname);
2772                         linkea_first_entry(ldata);
2773                         /* There may be some invalid dangling name entries under
2774                          * other parent directories, remove all of them. */
2775                         while (ldata->ld_lee != NULL) {
2776                                 rc = lfsck_namespace_unpack_linkea_entry(ldata,
2777                                                 cname, &tfid, info->lti_key,
2778                                                 sizeof(info->lti_key));
2779                                 if (rc != 0)
2780                                         goto next;
2781
2782                                 parent = lfsck_object_find_bottom(env, lfsck,
2783                                                                   &tfid);
2784                                 if (IS_ERR(parent)) {
2785                                         rc = PTR_ERR(parent);
2786                                         if (rc != -ENOENT &&
2787                                             bk->lb_param & LPF_FAILOUT)
2788                                                 RETURN(rc);
2789
2790                                         goto next;
2791                                 }
2792
2793                                 if (!dt_object_exists(parent)) {
2794                                         lfsck_object_put(env, parent);
2795                                         goto next;
2796                                 }
2797
2798                                 rc = lfsck_namespace_repair_dirent(env, com,
2799                                         parent, child, cname->ln_name,
2800                                         cname->ln_name, S_IFDIR, false, true);
2801                                 lfsck_object_put(env, parent);
2802                                 if (rc < 0) {
2803                                         if (bk->lb_param & LPF_FAILOUT)
2804                                                 RETURN(rc);
2805
2806                                         goto next;
2807                                 }
2808
2809                                 dirent_count += rc;
2810
2811 next:
2812                                 lfsck_linkea_del_buf(ldata, cname);
2813                         }
2814
2815                         ns->ln_dirent_repaired += dirent_count;
2816
2817                         RETURN(rc);
2818                 } /* lu_fid_eq(&tfid, lfsck_dto2fid(child)) */
2819
2820                 lfsck_ibits_unlock(lh, LCK_EX);
2821                 /* The name entry references another MDT-object that may be
2822                  * created by the LFSCK for repairing dangling name entry.
2823                  * Try to replace it. */
2824                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
2825                                                   &tfid, cname);
2826                 lfsck_object_put(env, parent);
2827                 if (rc < 0)
2828                         RETURN(rc);
2829
2830                 if (rc > 0)
2831                         goto rebuild;
2832
2833                 lfsck_linkea_del_buf(ldata, cname);
2834         } /* while (ldata->ld_lee != NULL) */
2835
2836         /* If there is still linkEA overflow, return. */
2837         if (unlikely(ldata->ld_leh->leh_overflow_time))
2838                 RETURN(0);
2839
2840         linkea_first_entry(ldata);
2841         if (ldata->ld_leh->leh_reccount == 1) {
2842                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, ldata,
2843                                                 lh, type, NULL, unknown);
2844
2845                 RETURN(rc);
2846         }
2847
2848         /* All linkEA entries are invalid and removed, then handle the @child
2849          * as an orphan.*/
2850         if (ldata->ld_leh->leh_reccount == 0) {
2851                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, lh,
2852                                                 type);
2853
2854                 RETURN(rc);
2855         }
2856
2857         /* If the dangling name entry for the orphan directory object has
2858          * been remvoed, then just check whether the directory object is
2859          * still under the .lustre/lost+found/MDTxxxx/ or not. */
2860         if (lpf) {
2861                 lpf = false;
2862                 goto again;
2863         }
2864
2865         /* There is no linkEA entry that matches the ".." name entry. Find
2866          * the first linkEA entry that both parent and name entry exist to
2867          * rebuild a new ".." name entry. */
2868         if (once) {
2869                 once = false;
2870                 goto again;
2871         }
2872
2873         RETURN(rc);
2874 }
2875
2876 /**
2877  * Repair the object's nlink attribute.
2878  *
2879  * If all the known name entries have been verified, then the object's hard
2880  * link attribute should match the object's linkEA entries count unless the
2881  * object's has too many hard link to be recorded in the linkEA. Such cases
2882  * should have been marked in the LFSCK trace file. Otherwise, trust the
2883  * linkEA to update the object's nlink attribute.
2884  *
2885  * \param[in] env       pointer to the thread context
2886  * \param[in] com       pointer to the lfsck component
2887  * \param[in] obj       pointer to the dt_object to be handled
2888  * \param[in,out] la    pointer to buffer to object's attribute before
2889  *                      and after the repairing
2890  *
2891  * \retval              positive number for repaired cases
2892  * \retval              0 if nothing to be repaired
2893  * \retval              negative error number on failure
2894  */
2895 static int lfsck_namespace_repair_nlink(const struct lu_env *env,
2896                                         struct lfsck_component *com,
2897                                         struct dt_object *obj,
2898                                         struct lu_attr *la)
2899 {
2900         struct lfsck_namespace          *ns     = com->lc_file_ram;
2901         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2902         struct dt_device                *dev    = lfsck_obj2dev(obj);
2903         const struct lu_fid             *cfid   = lfsck_dto2fid(obj);
2904         struct thandle                  *th     = NULL;
2905         struct linkea_data               ldata  = { NULL };
2906         struct lustre_handle             lh     = { 0 };
2907         __u32                            old    = la->la_nlink;
2908         int                              rc     = 0;
2909         ENTRY;
2910
2911         LASSERT(!dt_object_remote(obj));
2912
2913         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
2914                               MDS_INODELOCK_UPDATE, LCK_PW);
2915         if (rc != 0)
2916                 GOTO(log, rc);
2917
2918         th = dt_trans_create(env, dev);
2919         if (IS_ERR(th))
2920                 GOTO(log, rc = PTR_ERR(th));
2921
2922         la->la_valid = LA_NLINK;
2923         rc = dt_declare_attr_set(env, obj, la, th);
2924         if (rc != 0)
2925                 GOTO(stop, rc);
2926
2927         rc = dt_trans_start_local(env, dev, th);
2928         if (rc != 0)
2929                 GOTO(stop, rc);
2930
2931         dt_write_lock(env, obj, 0);
2932         /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT has
2933          * ever tried to verify some remote MDT-object that resides on this
2934          * MDT, but this MDT failed to respond such request. So means there
2935          * may be some remote name entry on other MDT that references this
2936          * object with another name, so we cannot know whether this linkEA
2937          * is valid or not. So keep it there and maybe resolved when next
2938          * LFSCK run. */
2939         if (ns->ln_flags & LF_INCOMPLETE)
2940                 GOTO(unlock, rc = 0);
2941
2942         rc = dt_attr_get(env, obj, la);
2943         if (rc != 0)
2944                 GOTO(unlock, rc = (rc == -ENOENT ? 0 : rc));
2945
2946         rc = lfsck_links_read2_with_rec(env, obj, &ldata);
2947         if (rc)
2948                 GOTO(unlock, rc = (rc == -ENODATA ? 0 : rc));
2949
2950         /* XXX: Currently, we only update the nlink attribute if the known
2951          *      linkEA entries is larger than the nlink attribute. That is
2952          *      safe action. */
2953         if (la->la_nlink >= ldata.ld_leh->leh_reccount ||
2954             unlikely(la->la_nlink == 0 ||
2955                      ldata.ld_leh->leh_overflow_time))
2956                 GOTO(unlock, rc = 0);
2957
2958         la->la_nlink = ldata.ld_leh->leh_reccount;
2959         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2960                 GOTO(unlock, rc = 1);
2961
2962         rc = dt_attr_set(env, obj, la, th);
2963
2964         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2965
2966 unlock:
2967         dt_write_unlock(env, obj);
2968
2969 stop:
2970         dt_trans_stop(env, dev, th);
2971
2972 log:
2973         lfsck_ibits_unlock(&lh, LCK_PW);
2974         CDEBUG(D_LFSCK, "%s: namespace LFSCK repaired the object "DFID"'s "
2975                "nlink count from %u to %u: rc = %d\n",
2976                lfsck_lfsck2name(lfsck), PFID(cfid), old, la->la_nlink, rc);
2977
2978         if (rc != 0)
2979                 ns->ln_flags |= LF_INCONSISTENT;
2980
2981         return rc;
2982 }
2983
2984 /**
2985  * Double scan the directory object for namespace LFSCK.
2986  *
2987  * This function will verify the <parent, child> pairs in the namespace tree:
2988  * the parent references the child via some name entry that should be in the
2989  * child's linkEA entry, the child should back references the parent via its
2990  * ".." name entry.
2991  *
2992  * The LFSCK will scan every linkEA entry in turn until find out the first
2993  * matched pairs. If found, then all other linkEA entries will be dropped.
2994  * If all the linkEA entries cannot match the ".." name entry, then there
2995  * are serveral possible cases:
2996  *
2997  * 1) If there is only one linkEA entry, then trust it as long as the PFID
2998  *    in the linkEA entry is valid.
2999  *
3000  * 2) If there are multiple linkEA entries, then try to find the linkEA
3001  *    that matches the ".." name entry. If found, then all other entries
3002  *    are invalid; otherwise, it is quite possible that the ".." name entry
3003  *    is corrupted. Under such case, the LFSCK will rebuild the ".." name
3004  *    entry according to the first valid linkEA entry (both the parent and
3005  *    the name entry should exist).
3006  *
3007  * 3) If the directory object has no (valid) linkEA entry, then the
3008  *    directory object will be handled as pure orphan and inserted
3009  *    in the .lustre/lost+found/MDTxxxx/ with the name:
3010  *    ${self_FID}-${PFID}-D-${conflict_version}
3011  *
3012  * \param[in] env       pointer to the thread context
3013  * \param[in] com       pointer to the lfsck component
3014  * \param[in] child     pointer to the directory object to be handled
3015  * \param[in] flags     to indicate the specical checking on the @child
3016  *
3017  * \retval              positive number for repaired cases
3018  * \retval              0 if nothing to be repaired
3019  * \retval              negative error number on failure
3020  */
3021 static int lfsck_namespace_double_scan_dir(const struct lu_env *env,
3022                                            struct lfsck_component *com,
3023                                            struct dt_object *child, __u8 flags)
3024 {
3025         struct lfsck_thread_info *info          = lfsck_env_info(env);
3026         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
3027         struct lu_fid            *pfid          = &info->lti_fid2;
3028         struct lfsck_namespace   *ns            = com->lc_file_ram;
3029         struct lfsck_instance    *lfsck         = com->lc_lfsck;
3030         struct lustre_handle      lh            = { 0 };
3031         struct linkea_data        ldata         = { NULL };
3032         bool                      unknown       = false;
3033         bool                      lpf           = false;
3034         bool                      retry         = false;
3035         enum lfsck_namespace_inconsistency_type type = LNIT_BAD_LINKEA;
3036         int                       rc            = 0;
3037         ENTRY;
3038
3039         LASSERT(!dt_object_remote(child));
3040
3041         if (flags & LNTF_UNCERTAIN_LMV) {
3042                 if (flags & LNTF_RECHECK_NAME_HASH) {
3043                         rc = lfsck_namespace_scan_shard(env, com, child);
3044                         if (rc < 0)
3045                                 RETURN(rc);
3046
3047                         ns->ln_striped_shards_scanned++;
3048                 } else {
3049                         ns->ln_striped_shards_skipped++;
3050                 }
3051         }
3052
3053         flags &= ~(LNTF_RECHECK_NAME_HASH | LNTF_UNCERTAIN_LMV);
3054         if (flags == 0)
3055                 RETURN(0);
3056
3057         if (flags & (LNTF_CHECK_LINKEA | LNTF_CHECK_PARENT) &&
3058             !(lfsck->li_bookmark_ram.lb_param & LPF_ALL_TGT)) {
3059                 CDEBUG(D_LFSCK, "%s: some MDT(s) maybe NOT take part in the"
3060                        "the namespace LFSCK, then the LFSCK cannot guarantee"
3061                        "all the name entries have been verified in first-stage"
3062                        "scanning. So have to skip orphan related handling for"
3063                        "the directory object "DFID" with remote name entry\n",
3064                        lfsck_lfsck2name(lfsck), PFID(cfid));
3065
3066                 RETURN(0);
3067         }
3068
3069         if (unlikely(!dt_try_as_dir(env, child)))
3070                 GOTO(out, rc = -ENOTDIR);
3071
3072         /* We only take ldlm lock on the @child when required. When the
3073          * logic comes here for the first time, it is always false. */
3074         if (0) {
3075
3076 lock:
3077                 rc = lfsck_ibits_lock(env, lfsck, child, &lh,
3078                                       MDS_INODELOCK_UPDATE |
3079                                       MDS_INODELOCK_XATTR, LCK_EX);
3080                 if (rc != 0)
3081                         GOTO(out, rc);
3082         }
3083
3084         dt_read_lock(env, child, 0);
3085         if (unlikely(lfsck_is_dead_obj(child))) {
3086                 dt_read_unlock(env, child);
3087
3088                 GOTO(out, rc = 0);
3089         }
3090
3091         rc = dt_lookup(env, child, (struct dt_rec *)pfid,
3092                        (const struct dt_key *)dotdot);
3093         if (rc != 0) {
3094                 if (rc != -ENOENT && rc != -ENODATA && rc != -EINVAL) {
3095                         dt_read_unlock(env, child);
3096
3097                         GOTO(out, rc);
3098                 }
3099
3100                 if (!lustre_handle_is_used(&lh)) {
3101                         dt_read_unlock(env, child);
3102                         goto lock;
3103                 }
3104
3105                 fid_zero(pfid);
3106         } else if (lfsck->li_lpf_obj != NULL &&
3107                    lu_fid_eq(pfid, lfsck_dto2fid(lfsck->li_lpf_obj))) {
3108                 lpf = true;
3109         } else if (unlikely(!fid_is_sane(pfid))) {
3110                 fid_zero(pfid);
3111         }
3112
3113         rc = lfsck_links_read(env, child, &ldata);
3114         dt_read_unlock(env, child);
3115         if (rc != 0) {
3116                 if (rc != -ENODATA && rc != -EINVAL)
3117                         GOTO(out, rc);
3118
3119                 if (!lustre_handle_is_used(&lh))
3120                         goto lock;
3121
3122                 if (rc == -EINVAL && !fid_is_zero(pfid)) {
3123                         /* Remove the corrupted linkEA. */
3124                         rc = lfsck_namespace_links_remove(env, com, child);
3125                         if (rc == 0)
3126                                 /* Here, because of the crashed linkEA, we
3127                                  * cannot know whether there is some parent
3128                                  * that references the child directory via
3129                                  * some name entry or not. So keep it there,
3130                                  * when the LFSCK run next time, if there is
3131                                  * some parent that references this object,
3132                                  * then the LFSCK can rebuild the linkEA;
3133                                  * otherwise, this object will be handled
3134                                  * as orphan as above. */
3135                                 unknown = true;
3136                 } else {
3137                         /* 1. If we have neither ".." nor linkEA,
3138                          *    then it is an orphan.
3139                          *
3140                          * 2. If we only have the ".." name entry,
3141                          *    but no parent references this child
3142                          *    directory, then handle it as orphan. */
3143                         lfsck_ibits_unlock(&lh, LCK_EX);
3144                         type = LNIT_MUL_REF;
3145
3146                         /* If the LFSCK is marked as LF_INCOMPLETE,
3147                          * then means some MDT has ever tried to
3148                          * verify some remote MDT-object that resides
3149                          * on this MDT, but this MDT failed to respond
3150                          * such request. So means there may be some
3151                          * remote name entry on other MDT that
3152                          * references this object with another name,
3153                          * so we cannot know whether this linkEA is
3154                          * valid or not. So keep it there and maybe
3155                          * resolved when next LFSCK run. */
3156                         if (ns->ln_flags & LF_INCOMPLETE)
3157                                 GOTO(out, rc = 0);
3158
3159                         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
3160                                  "-"DFID, PFID(pfid));
3161                         rc = lfsck_namespace_insert_orphan(env, com, child,
3162                                                 info->lti_tmpbuf, "D", NULL);
3163                 }
3164
3165                 GOTO(out, rc);
3166         } /* rc != 0 */
3167
3168         linkea_first_entry(&ldata);
3169         /* This is the most common case: the object has unique linkEA entry. */
3170         if (ldata.ld_leh->leh_reccount == 1) {
3171                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, &ldata,
3172                                                 &lh, &type, &retry, &unknown);
3173                 if (retry) {
3174                         LASSERT(!lustre_handle_is_used(&lh));
3175
3176                         retry = false;
3177                         goto lock;
3178                 }
3179
3180                 GOTO(out, rc);
3181         }
3182
3183         if (!lustre_handle_is_used(&lh))
3184                 goto lock;
3185
3186         if (unlikely(ldata.ld_leh->leh_reccount == 0)) {
3187                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, &lh,
3188                                                 &type);
3189
3190                 GOTO(out, rc);
3191         }
3192
3193         /* When we come here, the cases usually like that:
3194          * 1) The directory object has a corrupted linkEA entry. During the
3195          *    first-stage scanning, the LFSCK cannot know such corruption,
3196          *    then it appends the right linkEA entry according to the found
3197          *    name entry after the bad one.
3198          *
3199          * 2) The directory object has a right linkEA entry. During the
3200          *    first-stage scanning, the LFSCK finds some bad name entry,
3201          *    but the LFSCK cannot aware that at that time, then it adds
3202          *    the bad linkEA entry for further processing. */
3203         rc = lfsck_namespace_dsd_multiple(env, com, child, pfid, &ldata,
3204                                           &lh, &type, lpf, &unknown);
3205
3206         GOTO(out, rc);
3207
3208 out:
3209         lfsck_ibits_unlock(&lh, LCK_EX);
3210         if (rc > 0) {
3211                 switch (type) {
3212                 case LNIT_BAD_LINKEA:
3213                         ns->ln_linkea_repaired++;
3214                         break;
3215                 case LNIT_UNMATCHED_PAIRS:
3216                         ns->ln_unmatched_pairs_repaired++;
3217                         break;
3218                 case LNIT_MUL_REF:
3219                         ns->ln_mul_ref_repaired++;
3220                         break;
3221                 default:
3222                         break;
3223                 }
3224         }
3225
3226         if (unknown)
3227                 ns->ln_unknown_inconsistency++;
3228
3229         return rc;
3230 }
3231
3232 static inline bool
3233 lfsck_namespace_linkea_stale_overflow(struct linkea_data *ldata,
3234                                       struct lfsck_namespace *ns)
3235 {
3236         /* Both the leh_overflow_time and ln_time_latest_reset are
3237          * local time based, so need NOT to care about clock drift
3238          * among the servers. */
3239         return ldata->ld_leh->leh_overflow_time &&
3240                ldata->ld_leh->leh_overflow_time < ns->ln_time_latest_reset;
3241 }
3242
3243 /**
3244  * Clear the object's linkEA overflow timestamp.
3245  *
3246  * If the MDT-object has too many hard links as to the linkEA cannot hold
3247  * all of them, then overflow timestamp will be set in the linkEA header.
3248  * If some hard links are removed after that, then it is possible to hold
3249  * other missed linkEA entries. If the namespace LFSCK have added all the
3250  * related linkEA entries, then it will remove the overflow timestamp.
3251  *
3252  * \param[in] env       pointer to the thread context
3253  * \param[in] com       pointer to the lfsck component
3254  * \param[in] ldata     pointer to the linkEA data for the given @obj
3255  * \param[in] obj       pointer to the dt_object to be handled
3256  *
3257  * \retval              positive number for repaired cases
3258  * \retval              0 if nothing to be repaired
3259  * \retval              negative error number on failure
3260  */
3261 static int lfsck_namespace_linkea_clear_overflow(const struct lu_env *env,
3262                                                  struct lfsck_component *com,
3263                                                  struct linkea_data *ldata,
3264                                                  struct dt_object *obj)
3265 {
3266         struct lfsck_namespace *ns = com->lc_file_ram;
3267         struct lfsck_instance *lfsck = com->lc_lfsck;
3268         struct dt_device *dev = lfsck_obj2dev(obj);
3269         struct thandle *th = NULL;
3270         struct lustre_handle lh = { 0 };
3271         struct lu_buf linkea_buf;
3272         int rc = 0;
3273         ENTRY;
3274
3275         LASSERT(!dt_object_remote(obj));
3276
3277         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
3278                               MDS_INODELOCK_UPDATE, LCK_PW);
3279         if (rc != 0)
3280                 GOTO(log, rc);
3281
3282         th = dt_trans_create(env, dev);
3283         if (IS_ERR(th))
3284                 GOTO(log, rc = PTR_ERR(th));
3285
3286         rc = dt_declare_xattr_set(env, obj,
3287                         lfsck_buf_get_const(env, NULL, MAX_LINKEA_SIZE),
3288                         XATTR_NAME_LINK, 0, th);
3289         if (rc != 0)
3290                 GOTO(stop, rc);
3291
3292         rc = dt_trans_start_local(env, dev, th);
3293         if (rc != 0)
3294                 GOTO(stop, rc);
3295
3296         dt_write_lock(env, obj, 0);
3297         rc = lfsck_links_read(env, obj, ldata);
3298         if (rc != 0)
3299                 GOTO(unlock, rc);
3300
3301         if (unlikely(!lfsck_namespace_linkea_stale_overflow(ldata, ns)))
3302                 GOTO(unlock, rc = 0);
3303
3304         ldata->ld_leh->leh_overflow_time = 0;
3305         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
3306                 GOTO(unlock, rc = 1);
3307
3308         /* If all known entries are in the linkEA, then the 'leh_reccount'
3309          * should NOT be zero. */
3310         LASSERT(ldata->ld_leh->leh_reccount > 0);
3311
3312         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
3313                        ldata->ld_leh->leh_len);
3314         rc = dt_xattr_set(env, obj, &linkea_buf, XATTR_NAME_LINK, 0, th);
3315         if (unlikely(rc == -ENOSPC))
3316                 rc = 0;
3317         else if (!rc)
3318                 rc = 1;
3319
3320         GOTO(unlock, rc);
3321
3322 unlock:
3323         dt_write_unlock(env, obj);
3324
3325 stop:
3326         dt_trans_stop(env, dev, th);
3327
3328 log:
3329         lfsck_ibits_unlock(&lh, LCK_PW);
3330         CDEBUG(D_LFSCK, "%s: clear linkea overflow timestamp for the object "
3331                DFID": rc = %d\n",
3332                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
3333
3334         return rc;
3335 }
3336
3337 /**
3338  * Verify the object's agent entry.
3339  *
3340  * If the object claims to have agent entry but the linkEA does not contain
3341  * remote parent, then remove the agent entry. Otherwise, if the object has
3342  * no agent entry but its linkEA contains remote parent, then will generate
3343  * agent entry for it.
3344  *
3345  * \param[in] env       pointer to the thread context
3346  * \param[in] com       pointer to the lfsck component
3347  * \param[in] obj       pointer to the dt_object to be handled
3348  *
3349  * \retval              positive number for repaired cases
3350  * \retval              0 if nothing to be repaired
3351  * \retval              negative error number on failure
3352  */
3353 static int lfsck_namespace_check_agent_entry(const struct lu_env *env,
3354                                              struct lfsck_component *com,
3355                                              struct dt_object *obj)
3356 {
3357         struct linkea_data ldata = { NULL };
3358         struct lfsck_thread_info *info = lfsck_env_info(env);
3359         struct lfsck_namespace *ns = com->lc_file_ram;
3360         struct lfsck_instance *lfsck = com->lc_lfsck;
3361         struct lu_fid *pfid = &info->lti_fid2;
3362         struct lu_name *cname = &info->lti_name;
3363         struct lu_seq_range *range = &info->lti_range;
3364         struct seq_server_site *ss = lfsck_dev_site(lfsck);
3365         __u32 idx = lfsck_dev_idx(lfsck);
3366         int rc;
3367         bool remote = false;
3368         ENTRY;
3369
3370         if (!(lfsck->li_bookmark_ram.lb_param & LPF_ALL_TGT))
3371                 RETURN(0);
3372
3373         rc = lfsck_links_read_with_rec(env, obj, &ldata);
3374         if (rc == -ENOENT || rc == -ENODATA)
3375                 RETURN(0);
3376
3377         if (rc && rc != -EINVAL)
3378                 GOTO(out, rc);
3379
3380         /* We check the agent entry again after verifying the linkEA
3381          * successfully. So invalid linkEA should be dryrun mode. */
3382         if (rc == -EINVAL || unlikely(!ldata.ld_leh->leh_reccount))
3383                 RETURN(0);
3384
3385         linkea_first_entry(&ldata);
3386         while (ldata.ld_lee != NULL && !remote) {
3387                 linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen,
3388                                     cname, pfid);
3389                 /* If parent FID is unknown, not verify agent entry. */
3390                 if (!fid_is_sane(pfid))
3391                         GOTO(out, rc = 0);
3392
3393                 fld_range_set_mdt(range);
3394                 rc = fld_server_lookup(env, ss->ss_server_fld,
3395                                        fid_seq(pfid), range);
3396                 if (rc)
3397                         GOTO(out, rc = (rc == -ENOENT ? 0 : rc));
3398
3399                 if (range->lsr_index != idx)
3400                         remote = true;
3401                 else
3402                         linkea_next_entry(&ldata);
3403         }
3404
3405         if ((lu_object_has_agent_entry(&obj->do_lu) && !remote) ||
3406             (!lu_object_has_agent_entry(&obj->do_lu) && remote)) {
3407                 struct dt_device *dev = lfsck_obj2dev(obj);
3408                 struct linkea_data ldata2 = { NULL };
3409                 struct lustre_handle lh = { 0 };
3410                 struct lu_buf linkea_buf;
3411                 struct thandle *handle;
3412
3413                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
3414                         GOTO(out, rc = 1);
3415
3416                 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
3417                                       MDS_INODELOCK_UPDATE |
3418                                       MDS_INODELOCK_XATTR, LCK_EX);
3419                 if (rc)
3420                         GOTO(out, rc);
3421
3422                 handle = dt_trans_create(env, dev);
3423                 if (IS_ERR(handle))
3424                         GOTO(unlock, rc = PTR_ERR(handle));
3425
3426                 lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
3427                                ldata.ld_leh->leh_len);
3428                 rc = dt_declare_xattr_set(env, obj, &linkea_buf,
3429                                 XATTR_NAME_LINK, LU_XATTR_REPLACE, handle);
3430                 if (rc)
3431                         GOTO(stop, rc);
3432
3433                 rc = dt_trans_start_local(env, dev, handle);
3434                 if (rc)
3435                         GOTO(stop, rc);
3436
3437                 dt_write_lock(env, obj, 0);
3438                 rc = lfsck_links_read2_with_rec(env, obj, &ldata2);
3439                 if (rc) {
3440                         if (rc == -ENOENT || rc == -ENODATA)
3441                                 rc = 0;
3442                         GOTO(unlock2, rc);
3443                 }
3444
3445                 /* If someone changed linkEA by race, then the agent
3446                  * entry will be updated by lower layer automatically. */
3447                 if (ldata.ld_leh->leh_len != ldata2.ld_leh->leh_len ||
3448                     memcmp(ldata.ld_buf->lb_buf, ldata2.ld_buf->lb_buf,
3449                            ldata.ld_leh->leh_len) != 0)
3450                         GOTO(unlock2, rc = 0);
3451
3452                 rc = dt_xattr_set(env, obj, &linkea_buf, XATTR_NAME_LINK,
3453                                   LU_XATTR_REPLACE, handle);
3454                 if (!rc)
3455                         rc = 1;
3456
3457                 GOTO(unlock2, rc);
3458
3459 unlock2:
3460                 dt_write_unlock(env, obj);
3461 stop:
3462                 dt_trans_stop(env, dev, handle);
3463 unlock:
3464                 lfsck_ibits_unlock(&lh, LCK_EX);
3465         }
3466
3467         GOTO(out, rc);
3468
3469 out:
3470         if (rc > 0)
3471                 ns->ln_agent_entries_repaired++;
3472         if (rc)
3473                 CDEBUG(D_LFSCK, "%s: repair agent entry for "DFID": rc = %d\n",
3474                        lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
3475         return rc;
3476 }
3477
3478 /**
3479  * Double scan the MDT-object for namespace LFSCK.
3480  *
3481  * If the MDT-object contains invalid or repeated linkEA entries, then drop
3482  * those entries from the linkEA; if the linkEA becomes empty or the object
3483  * has no linkEA, then it is an orphan and will be added into the directory
3484  * .lustre/lost+found/MDTxxxx/; if the remote parent is lost, then recreate
3485  * the remote parent; if the name entry corresponding to some linkEA entry
3486  * is lost, then add the name entry back to the namespace.
3487  *
3488  * \param[in] env       pointer to the thread context
3489  * \param[in] com       pointer to the lfsck component
3490  * \param[in] child     pointer to the dt_object to be handled
3491  * \param[in] flags     some hints to indicate how the @child should be handled
3492  *
3493  * \retval              positive number for repaired cases
3494  * \retval              0 if nothing to be repaired
3495  * \retval              negative error number on failure
3496  */
3497 static int lfsck_namespace_double_scan_one(const struct lu_env *env,
3498                                            struct lfsck_component *com,
3499                                            struct dt_object *child, __u8 flags)
3500 {
3501         struct lfsck_thread_info *info     = lfsck_env_info(env);
3502         struct lu_attr           *la       = &info->lti_la;
3503         struct lu_name           *cname    = &info->lti_name;
3504         struct lu_fid            *pfid     = &info->lti_fid;
3505         struct lu_fid            *cfid     = &info->lti_fid2;
3506         struct lfsck_instance    *lfsck    = com->lc_lfsck;
3507         struct lfsck_namespace   *ns       = com->lc_file_ram;
3508         struct dt_object         *parent   = NULL;
3509         struct linkea_data        ldata    = { NULL };
3510         bool                      repaired = false;
3511         int                       count    = 0;
3512         int                       rc;
3513         ENTRY;
3514
3515         dt_read_lock(env, child, 0);
3516         if (unlikely(lfsck_is_dead_obj(child))) {
3517                 dt_read_unlock(env, child);
3518
3519                 RETURN(0);
3520         }
3521
3522         if (S_ISDIR(lfsck_object_type(child))) {
3523                 dt_read_unlock(env, child);
3524                 rc = lfsck_namespace_double_scan_dir(env, com, child, flags);
3525                 if (!rc && flags & LNTF_CHECK_AGENT_ENTRY)
3526                         rc = lfsck_namespace_check_agent_entry(env, com, child);
3527
3528                 RETURN(rc);
3529         }
3530
3531         rc = lfsck_links_read(env, child, &ldata);
3532         dt_read_unlock(env, child);
3533
3534         if (rc == -EINVAL) {
3535                 struct lustre_handle lh = { 0 };
3536
3537                 rc = lfsck_ibits_lock(env, com->lc_lfsck, child, &lh,
3538                                       MDS_INODELOCK_UPDATE |
3539                                       MDS_INODELOCK_XATTR, LCK_EX);
3540                 if (rc == 0) {
3541                         rc = lfsck_namespace_links_remove(env, com, child);
3542                         lfsck_ibits_unlock(&lh, LCK_EX);
3543                 }
3544
3545                 GOTO(out, rc);
3546         }
3547
3548         if (rc != 0)
3549                 GOTO(out, rc);
3550
3551         if (!(ns->ln_flags & LF_INCOMPLETE) &&
3552             unlikely(lfsck_namespace_linkea_stale_overflow(&ldata, ns))) {
3553                 rc = lfsck_namespace_linkea_clear_overflow(env, com, &ldata,
3554                                                            child);
3555                 if (rc < 0)
3556                         GOTO(out, rc);
3557
3558                 if (rc > 0)
3559                         ns->ln_linkea_overflow_cleared++;
3560         }
3561
3562         linkea_first_entry(&ldata);
3563         while (ldata.ld_lee != NULL) {
3564                 rc = lfsck_namespace_unpack_linkea_entry(&ldata, cname, pfid,
3565                                                          info->lti_key,
3566                                                          sizeof(info->lti_key));
3567                 /* Invalid PFID in the linkEA entry. */
3568                 if (rc != 0) {
3569                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3570                                                 &ldata, cname, pfid, true);
3571                         if (rc < 0)
3572                                 GOTO(out, rc);
3573
3574                         if (rc > 0)
3575                                 repaired = true;
3576
3577                         continue;
3578                 }
3579
3580                 rc = lfsck_namespace_filter_linkea_entry(&ldata, cname, pfid,
3581                                                          false);
3582                 /* Found repeated linkEA entries */
3583                 if (rc > 0) {
3584                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3585                                                 &ldata, cname, pfid, false);
3586                         if (rc < 0)
3587                                 GOTO(out, rc);
3588
3589                         if (rc == 0)
3590                                 continue;
3591
3592                         repaired = true;
3593
3594                         /* fall through */
3595                 }
3596
3597                 parent = lfsck_object_find_bottom(env, lfsck, pfid);
3598                 if (IS_ERR(parent))
3599                         GOTO(out, rc = PTR_ERR(parent));
3600
3601                 if (!dt_object_exists(parent)) {
3602
3603 lost_parent:
3604                         if (ldata.ld_leh->leh_reccount > 1) {
3605                                 /* If it is NOT the last linkEA entry, then
3606                                  * there is still other chance to make the
3607                                  * child to be visible via other parent, then
3608                                  * remove this linkEA entry. */
3609                                 rc = lfsck_namespace_shrink_linkea(env, com,
3610                                         child, &ldata, cname, pfid, true);
3611                         } else {
3612                                 /* If the LFSCK is marked as LF_INCOMPLETE,
3613                                  * then means some MDT has ever tried to
3614                                  * verify some remote MDT-object that resides
3615                                  * on this MDT, but this MDT failed to respond
3616                                  * such request. So means there may be some
3617                                  * remote name entry on other MDT that
3618                                  * references this object with another name,
3619                                  * so we cannot know whether this linkEA is
3620                                  * valid or not. So keep it there and maybe
3621                                  * resolved when next LFSCK run. */
3622                                 if (ns->ln_flags & LF_INCOMPLETE) {
3623                                         lfsck_object_put(env, parent);
3624
3625                                         GOTO(out, rc = 0);
3626                                 }
3627
3628                                 /* Create the lost parent as an orphan. */
3629                                 rc = lfsck_namespace_create_orphan_dir(env, com,
3630                                                                 parent, NULL);
3631                                 if (rc < 0) {
3632                                         lfsck_object_put(env, parent);
3633
3634                                         GOTO(out, rc);
3635                                 }
3636
3637                                 if (rc > 0)
3638                                         repaired = true;
3639
3640                                 /* Add the missing name entry to the parent. */
3641                                 rc = lfsck_namespace_insert_normal(env, com,
3642                                                 parent, child, cname->ln_name);
3643                                 if (unlikely(rc == -EEXIST))
3644                                         /* Unfortunately, someone reused the
3645                                          * name under the parent by race. So we
3646                                          * have to remove the linkEA entry from
3647                                          * current child object. It means that
3648                                          * the LFSCK cannot recover the system
3649                                          * totally back to its original status,
3650                                          * but it is necessary to make the
3651                                          * current system to be consistent. */
3652                                         rc = lfsck_namespace_shrink_linkea(env,
3653                                                         com, child, &ldata,
3654                                                         cname, pfid, true);
3655                                 else
3656                                         linkea_next_entry(&ldata);
3657                         }
3658
3659                         lfsck_object_put(env, parent);
3660                         if (rc < 0)
3661                                 GOTO(out, rc);
3662
3663                         if (rc > 0)
3664                                 repaired = true;
3665
3666                         continue;
3667                 } /* !dt_object_exists(parent) */
3668
3669                 /* The linkEA entry with bad parent will be removed. */
3670                 if (unlikely(!dt_try_as_dir(env, parent))) {
3671                         lfsck_object_put(env, parent);
3672                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3673                                                 &ldata, cname, pfid, true);
3674                         if (rc < 0)
3675                                 GOTO(out, rc);
3676
3677                         if (rc > 0)
3678                                 repaired = true;
3679
3680                         continue;
3681                 }
3682
3683                 rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
3684                                (const struct dt_key *)cname->ln_name);
3685                 if (rc != 0 && rc != -ENOENT) {
3686                         lfsck_object_put(env, parent);
3687
3688                         GOTO(out, rc);
3689                 }
3690
3691                 if (rc == 0) {
3692                         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
3693                                 /* It is the most common case that we
3694                                  * find the name entry corresponding
3695                                  * to the linkEA entry. */
3696                                 lfsck_object_put(env, parent);
3697                                 linkea_next_entry(&ldata);
3698                         } else {
3699                                 /* The name entry references another
3700                                  * MDT-object that may be created by
3701                                  * the LFSCK for repairing dangling
3702                                  * name entry. Try to replace it. */
3703                                 rc = lfsck_namespace_replace_cond(env, com,
3704                                                 parent, child, cfid, cname);
3705                                 lfsck_object_put(env, parent);
3706                                 if (rc < 0)
3707                                         GOTO(out, rc);
3708
3709                                 if (rc > 0) {
3710                                         repaired = true;
3711                                         linkea_next_entry(&ldata);
3712                                 } else {
3713                                         rc = lfsck_namespace_shrink_linkea(env,
3714                                                         com, child, &ldata,
3715                                                         cname, pfid, true);
3716                                         if (rc < 0)
3717                                                 GOTO(out, rc);
3718
3719                                         if (rc > 0)
3720                                                 repaired = true;
3721                                 }
3722                         }
3723
3724                         continue;
3725                 }
3726
3727                 /* The following handles -ENOENT case */
3728
3729                 rc = dt_attr_get(env, child, la);
3730                 if (rc != 0)
3731                         GOTO(out, rc);
3732
3733                 /* If there is no name entry in the parent dir and the object
3734                  * link count is fewer than the linkea entries count, then the
3735                  * linkea entry should be removed. */
3736                 if (ldata.ld_leh->leh_reccount > la->la_nlink) {
3737                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
3738                                         parent, child, &ldata, cname, pfid);
3739                         lfsck_object_put(env, parent);
3740                         if (rc < 0)
3741                                 GOTO(out, rc);
3742
3743                         if (rc > 0)
3744                                 repaired = true;
3745
3746                         continue;
3747                 }
3748
3749                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some
3750                  * MDT has ever tried to verify some remote MDT-object that
3751                  * resides on this MDT, but this MDT failed to respond such
3752                  * request. So means there may be some remote name entry on
3753                  * other MDT that references this object with another name,
3754                  * so we cannot know whether this linkEA is valid or not.
3755                  * So keep it there and maybe resolved when next LFSCK run. */
3756                 if (ns->ln_flags & LF_INCOMPLETE) {
3757                         lfsck_object_put(env, parent);
3758
3759                         GOTO(out, rc = 0);
3760                 }
3761
3762                 rc = lfsck_namespace_check_name(env, parent, child, cname);
3763                 if (rc == -ENOENT)
3764                         goto lost_parent;
3765
3766                 if (rc < 0) {
3767                         lfsck_object_put(env, parent);
3768
3769                         GOTO(out, rc);
3770                 }
3771
3772                 /* It is an invalid name entry, drop it. */
3773                 if (unlikely(rc > 0)) {
3774                         lfsck_object_put(env, parent);
3775                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3776                                                 &ldata, cname, pfid, true);
3777                         if (rc < 0)
3778                                 GOTO(out, rc);
3779
3780                         if (rc > 0)
3781                                 repaired = true;
3782
3783                         continue;
3784                 }
3785
3786                 /* Add the missing name entry back to the namespace. */
3787                 rc = lfsck_namespace_insert_normal(env, com, parent, child,
3788                                                    cname->ln_name);
3789                 if (unlikely(rc == -ESTALE))
3790                         /* It may happen when the remote object has been
3791                          * removed, but the local MDT is not aware of that. */
3792                         goto lost_parent;
3793
3794                 if (unlikely(rc == -EEXIST))
3795                         /* Unfortunately, someone reused the name under the
3796                          * parent by race. So we have to remove the linkEA
3797                          * entry from current child object. It means that the
3798                          * LFSCK cannot recover the system totally back to
3799                          * its original status, but it is necessary to make
3800                          * the current system to be consistent.
3801                          *
3802                          * It also may be because of the LFSCK found some
3803                          * internal status of create operation. Under such
3804                          * case, nothing to be done. */
3805                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
3806                                         parent, child, &ldata, cname, pfid);
3807                 else
3808                         linkea_next_entry(&ldata);
3809
3810                 lfsck_object_put(env, parent);
3811                 if (rc < 0)
3812                         GOTO(out, rc);
3813
3814                 if (rc > 0)
3815                         repaired = true;
3816         }
3817
3818         GOTO(out, rc = 0);
3819
3820 out:
3821         if (rc < 0 && rc != -ENODATA)
3822                 return rc;
3823
3824         if (rc == 0 && ldata.ld_leh != NULL)
3825                 count = ldata.ld_leh->leh_reccount;
3826
3827         if (count == 0) {
3828                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some
3829                  * MDT has ever tried to verify some remote MDT-object that
3830                  * resides on this MDT, but this MDT failed to respond such
3831                  * request. So means there may be some remote name entry on
3832                  * other MDT that references this object with another name,
3833                  * so we cannot know whether this linkEA is valid or not.
3834                  * So keep it there and maybe resolved when next LFSCK run. */
3835                 if (!(ns->ln_flags & LF_INCOMPLETE) &&
3836                     (ldata.ld_leh == NULL ||
3837                      !ldata.ld_leh->leh_overflow_time)) {
3838                         /* If the child becomes orphan, then insert it into
3839                          * the global .lustre/lost+found/MDTxxxx directory. */
3840                         rc = lfsck_namespace_insert_orphan(env, com, child,
3841                                                            "", "O", &count);
3842                         if (rc < 0)
3843                                 return rc;
3844
3845                         if (rc > 0) {
3846                                 ns->ln_mul_ref_repaired++;
3847                                 repaired = true;
3848                         }
3849                 }
3850         } else {
3851                 rc = dt_attr_get(env, child, la);
3852                 if (rc != 0)
3853                         return rc;
3854
3855                 if (la->la_nlink != 0 && la->la_nlink != count) {
3856                         if (unlikely(!S_ISREG(lfsck_object_type(child)) &&
3857                                      !S_ISLNK(lfsck_object_type(child)))) {
3858                                 CDEBUG(D_LFSCK, "%s: namespace LFSCK finds "
3859                                        "the object "DFID"'s nlink count %d "
3860                                        "does not match linkEA count %d, "
3861                                        "type %o, skip it.\n",
3862                                        lfsck_lfsck2name(lfsck),
3863                                        PFID(lfsck_dto2fid(child)),
3864                                        la->la_nlink, count,
3865                                        lfsck_object_type(child));
3866                         } else if (la->la_nlink < count &&
3867                                    likely(!ldata.ld_leh->leh_overflow_time)) {
3868                                 rc = lfsck_namespace_repair_nlink(env, com,
3869                                                                   child, la);
3870                                 if (rc > 0) {
3871                                         ns->ln_objs_nlink_repaired++;
3872                                         rc = 0;
3873                                 }
3874                         }
3875                 }
3876         }
3877
3878         if (repaired) {
3879                 if (la->la_nlink > 1)
3880                         ns->ln_mul_linked_repaired++;
3881
3882                 if (rc == 0)
3883                         rc = 1;
3884         }
3885
3886         if (!rc && flags & LNTF_CHECK_AGENT_ENTRY)
3887                 rc = lfsck_namespace_check_agent_entry(env, com, child);
3888
3889         return rc;
3890 }
3891
3892 static void lfsck_namespace_dump_statistics(struct seq_file *m,
3893                                             struct lfsck_namespace *ns,
3894                                             __u64 checked_phase1,
3895                                             __u64 checked_phase2,
3896                                             time64_t time_phase1,
3897                                             time64_t time_phase2, bool dryrun)
3898 {
3899         const char *postfix = dryrun ? "inconsistent" : "repaired";
3900
3901         seq_printf(m, "checked_phase1: %llu\n"
3902                    "checked_phase2: %llu\n"
3903                    "%s_phase1: %llu\n"
3904                    "%s_phase2: %llu\n"
3905                    "failed_phase1: %llu\n"
3906                    "failed_phase2: %llu\n"
3907                    "directories: %llu\n"
3908                    "dirent_%s: %llu\n"
3909                    "linkea_%s: %llu\n"
3910                    "nlinks_%s: %llu\n"
3911                    "multiple_linked_checked: %llu\n"
3912                    "multiple_linked_%s: %llu\n"
3913                    "unknown_inconsistency: %llu\n"
3914                    "unmatched_pairs_%s: %llu\n"
3915                    "dangling_%s: %llu\n"
3916                    "multiple_referenced_%s: %llu\n"
3917                    "bad_file_type_%s: %llu\n"
3918                    "lost_dirent_%s: %llu\n"
3919                    "local_lost_found_scanned: %llu\n"
3920                    "local_lost_found_moved: %llu\n"
3921                    "local_lost_found_skipped: %llu\n"
3922                    "local_lost_found_failed: %llu\n"
3923                    "striped_dirs_scanned: %llu\n"
3924                    "striped_dirs_%s: %llu\n"
3925                    "striped_dirs_failed: %llu\n"
3926                    "striped_dirs_disabled: %llu\n"
3927                    "striped_dirs_skipped: %llu\n"
3928                    "striped_shards_scanned: %llu\n"
3929                    "striped_shards_%s: %llu\n"
3930                    "striped_shards_failed: %llu\n"
3931                    "striped_shards_skipped: %llu\n"
3932                    "name_hash_%s: %llu\n"
3933                    "linkea_overflow_%s: %llu\n"
3934                    "agent_entries_%s: %llu\n"
3935                    "success_count: %u\n"
3936                    "run_time_phase1: %lld seconds\n"
3937                    "run_time_phase2: %lld seconds\n",
3938                    checked_phase1,
3939                    checked_phase2,
3940                    dryrun ? "inconsistent" : "updated",
3941                    ns->ln_items_repaired,
3942                    dryrun ? "inconsistent" : "updated",
3943                    ns->ln_objs_repaired_phase2,
3944                    ns->ln_items_failed,
3945                    ns->ln_objs_failed_phase2,
3946                    ns->ln_dirs_checked,
3947                    postfix, ns->ln_dirent_repaired,
3948                    postfix, ns->ln_linkea_repaired,
3949                    postfix, ns->ln_objs_nlink_repaired,
3950                    ns->ln_mul_linked_checked,
3951                    postfix, ns->ln_mul_linked_repaired,
3952                    ns->ln_unknown_inconsistency,
3953                    postfix, ns->ln_unmatched_pairs_repaired,
3954                    postfix, ns->ln_dangling_repaired,
3955                    postfix, ns->ln_mul_ref_repaired,
3956                    postfix, ns->ln_bad_type_repaired,
3957                    postfix, ns->ln_lost_dirent_repaired,
3958                    ns->ln_local_lpf_scanned,
3959                    ns->ln_local_lpf_moved,
3960                    ns->ln_local_lpf_skipped,
3961                    ns->ln_local_lpf_failed,
3962                    ns->ln_striped_dirs_scanned,
3963                    postfix, ns->ln_striped_dirs_repaired,
3964                    ns->ln_striped_dirs_failed,
3965                    ns->ln_striped_dirs_disabled,
3966                    ns->ln_striped_dirs_skipped,
3967                    ns->ln_striped_shards_scanned,
3968                    postfix, ns->ln_striped_shards_repaired,
3969                    ns->ln_striped_shards_failed,
3970                    ns->ln_striped_shards_skipped,
3971                    postfix, ns->ln_name_hash_repaired,
3972                    dryrun ? "inconsistent" : "cleared",
3973                    ns->ln_linkea_overflow_cleared,
3974                    postfix, ns->ln_agent_entries_repaired,
3975                    ns->ln_success_count,
3976                    time_phase1,
3977                    time_phase2);
3978 }
3979
3980 static void lfsck_namespace_release_lmv(const struct lu_env *env,
3981                                         struct lfsck_component *com)
3982 {
3983         struct lfsck_instance           *lfsck  = com->lc_lfsck;
3984         struct lfsck_namespace          *ns     = com->lc_file_ram;
3985
3986         while (!list_empty(&lfsck->li_list_lmv)) {
3987                 struct lfsck_lmv_unit   *llu;
3988                 struct lfsck_lmv        *llmv;
3989
3990                 llu = list_entry(lfsck->li_list_lmv.next,
3991                                  struct lfsck_lmv_unit, llu_link);
3992                 llmv = &llu->llu_lmv;
3993
3994                 LASSERTF(atomic_read(&llmv->ll_ref) == 1,
3995                          "still in using: %u\n",
3996                          atomic_read(&llmv->ll_ref));
3997
3998                 ns->ln_striped_dirs_skipped++;
3999                 lfsck_lmv_put(env, llmv);
4000         }
4001 }
4002
4003 static int lfsck_namespace_check_for_double_scan(const struct lu_env *env,
4004                                                  struct lfsck_component *com,
4005                                                  struct dt_object *obj)
4006 {
4007         struct lu_attr *la = &lfsck_env_info(env)->lti_la;
4008         int             rc;
4009
4010         rc = dt_attr_get(env, obj, la);
4011         if (rc != 0)
4012                 return rc;
4013
4014         /* zero-linkEA object may be orphan, but it also maybe because
4015          * of upgrading. Currently, we cannot record it for double scan.
4016          * Because it may cause the LFSCK trace file to be too large. */
4017
4018         /* "la_ctime" == 1 means that it has ever been removed from
4019          * backend /lost+found directory but not been added back to
4020          * the normal namespace yet. */
4021
4022         if ((S_ISREG(lfsck_object_type(obj)) && la->la_nlink > 1) ||
4023             unlikely(la->la_ctime == 1))
4024                 rc = lfsck_namespace_trace_update(env, com, lfsck_dto2fid(obj),
4025                                                   LNTF_CHECK_LINKEA, true);
4026
4027         return rc;
4028 }
4029
4030 /* namespace APIs */
4031
4032 static int lfsck_namespace_reset(const struct lu_env *env,
4033                                  struct lfsck_component *com, bool init)
4034 {
4035         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4036         struct lfsck_namespace          *ns     = com->lc_file_ram;
4037         struct lfsck_assistant_data     *lad    = com->lc_data;
4038         struct dt_object                *root;
4039         int                              rc;
4040         ENTRY;
4041
4042         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
4043         if (IS_ERR(root))
4044                 GOTO(log, rc = PTR_ERR(root));
4045
4046         if (unlikely(!dt_try_as_dir(env, root)))
4047                 GOTO(put, rc = -ENOTDIR);
4048
4049         down_write(&com->lc_sem);
4050         if (init) {
4051                 memset(ns, 0, sizeof(*ns));
4052         } else {
4053                 __u32 count = ns->ln_success_count;
4054                 time64_t last_time = ns->ln_time_last_complete;
4055
4056                 memset(ns, 0, sizeof(*ns));
4057                 ns->ln_success_count = count;
4058                 ns->ln_time_last_complete = last_time;
4059         }
4060         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
4061         ns->ln_status = LS_INIT;
4062         ns->ln_time_latest_reset = ktime_get_real_seconds();
4063
4064         rc = lfsck_load_one_trace_file(env, com, root, &com->lc_obj,
4065                                        &dt_lfsck_namespace_features,
4066                                        LFSCK_NAMESPACE, true);
4067         if (rc)
4068                 GOTO(out, rc);
4069
4070         rc = lfsck_load_sub_trace_files(env, com, &dt_lfsck_namespace_features,
4071                                         LFSCK_NAMESPACE, true);
4072         if (rc != 0)
4073                 GOTO(out, rc);
4074
4075         lad->lad_incomplete = 0;
4076         CFS_RESET_BITMAP(lad->lad_bitmap);
4077
4078         rc = lfsck_namespace_store(env, com);
4079
4080         GOTO(out, rc);
4081
4082 out:
4083         up_write(&com->lc_sem);
4084
4085 put:
4086         lfsck_object_put(env, root);
4087 log:
4088         CDEBUG(D_LFSCK, "%s: namespace LFSCK reset: rc = %d\n",
4089                lfsck_lfsck2name(lfsck), rc);
4090         return rc;
4091 }
4092
4093 static void
4094 lfsck_namespace_fail(const struct lu_env *env, struct lfsck_component *com,
4095                      bool new_checked)
4096 {
4097         struct lfsck_namespace *ns = com->lc_file_ram;
4098
4099         down_write(&com->lc_sem);
4100         if (new_checked)
4101                 com->lc_new_checked++;
4102         lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
4103         up_write(&com->lc_sem);
4104 }
4105
4106 static void lfsck_namespace_close_dir(const struct lu_env *env,
4107                                       struct lfsck_component *com)
4108 {
4109         struct lfsck_namespace          *ns     = com->lc_file_ram;
4110         struct lfsck_assistant_data     *lad    = com->lc_data;
4111         struct lfsck_assistant_object   *lso    = NULL;
4112         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4113         struct lfsck_lmv                *llmv   = lfsck->li_lmv;
4114         struct lfsck_namespace_req      *lnr;
4115         __u32                            size   =
4116                                 sizeof(*lnr) + LFSCK_TMPBUF_LEN;
4117         bool                             wakeup = false;
4118         ENTRY;
4119
4120         if (llmv == NULL)
4121                 RETURN_EXIT;
4122
4123         OBD_ALLOC(lnr, size);
4124         if (lnr == NULL) {
4125                 ns->ln_striped_dirs_skipped++;
4126
4127                 RETURN_EXIT;
4128         }
4129
4130         lso = lfsck_assistant_object_init(env, lfsck_dto2fid(lfsck->li_obj_dir),
4131                         NULL, lfsck->li_pos_current.lp_oit_cookie, true);
4132         if (IS_ERR(lso)) {
4133                 OBD_FREE(lnr, size);
4134                 ns->ln_striped_dirs_skipped++;
4135
4136                 RETURN_EXIT;
4137         }
4138
4139         /* Generate a dummy request to indicate that all shards' name entry
4140          * in this striped directory has been scanned for the first time. */
4141         INIT_LIST_HEAD(&lnr->lnr_lar.lar_list);
4142         lnr->lnr_lar.lar_parent = lso;
4143         lnr->lnr_lmv = lfsck_lmv_get(llmv);
4144         lnr->lnr_fid = *lfsck_dto2fid(lfsck->li_obj_dir);
4145         lnr->lnr_dir_cookie = MDS_DIR_END_OFF;
4146         lnr->lnr_size = size;
4147         lnr->lnr_type = lso->lso_attr.la_mode;
4148
4149         spin_lock(&lad->lad_lock);
4150         if (lad->lad_assistant_status < 0 ||
4151             unlikely(!thread_is_running(&lfsck->li_thread) ||
4152                      !thread_is_running(&lad->lad_thread))) {
4153                 spin_unlock(&lad->lad_lock);
4154                 lfsck_namespace_assistant_req_fini(env, &lnr->lnr_lar);
4155                 ns->ln_striped_dirs_skipped++;
4156
4157                 RETURN_EXIT;
4158         }
4159
4160         list_add_tail(&lnr->lnr_lar.lar_list, &lad->lad_req_list);
4161         if (lad->lad_prefetched == 0)
4162                 wakeup = true;
4163
4164         lad->lad_prefetched++;
4165         spin_unlock(&lad->lad_lock);
4166         if (wakeup)
4167                 wake_up_all(&lad->lad_thread.t_ctl_waitq);
4168
4169         EXIT;
4170 }
4171
4172 static int lfsck_namespace_open_dir(const struct lu_env *env,
4173                                     struct lfsck_component *com)
4174 {
4175         struct lfsck_instance   *lfsck  = com->lc_lfsck;
4176         struct lfsck_namespace  *ns     = com->lc_file_ram;
4177         struct lfsck_lmv        *llmv   = lfsck->li_lmv;
4178         int                      rc     = 0;
4179         ENTRY;
4180
4181         if (llmv == NULL)
4182                 RETURN(0);
4183
4184         if (llmv->ll_lmv_master) {
4185                 struct lmv_mds_md_v1 *lmv = &llmv->ll_lmv;
4186
4187                 if (lmv->lmv_master_mdt_index != lfsck_dev_idx(lfsck)) {
4188                         lmv->lmv_master_mdt_index =
4189                                 lfsck_dev_idx(lfsck);
4190                         ns->ln_flags |= LF_INCONSISTENT;
4191                         llmv->ll_lmv_updated = 1;
4192                 }
4193         } else {
4194                 rc = lfsck_namespace_verify_stripe_slave(env, com,
4195                                         lfsck->li_obj_dir, llmv);
4196         }
4197
4198         RETURN(rc > 0 ? 0 : rc);
4199 }
4200
4201 static int lfsck_namespace_checkpoint(const struct lu_env *env,
4202                                       struct lfsck_component *com, bool init)
4203 {
4204         struct lfsck_instance   *lfsck = com->lc_lfsck;
4205         struct lfsck_namespace  *ns    = com->lc_file_ram;
4206         int                      rc;
4207
4208         if (!init) {
4209                 rc = lfsck_checkpoint_generic(env, com);
4210                 if (rc != 0)
4211                         goto log;
4212         }
4213
4214         down_write(&com->lc_sem);
4215         if (init) {
4216                 ns->ln_pos_latest_start = lfsck->li_pos_checkpoint;
4217         } else {
4218                 ns->ln_pos_last_checkpoint = lfsck->li_pos_checkpoint;
4219                 ns->ln_run_time_phase1 += ktime_get_seconds() -
4220                                           lfsck->li_time_last_checkpoint;
4221                 ns->ln_time_last_checkpoint = ktime_get_real_seconds();
4222                 ns->ln_items_checked += com->lc_new_checked;
4223                 com->lc_new_checked = 0;
4224         }
4225
4226         rc = lfsck_namespace_store(env, com);
4227         up_write(&com->lc_sem);
4228
4229 log:
4230         CDEBUG(D_LFSCK, "%s: namespace LFSCK checkpoint at the pos [%llu"
4231                ", "DFID", %#llx], status = %d: rc = %d\n",
4232                lfsck_lfsck2name(lfsck), lfsck->li_pos_current.lp_oit_cookie,
4233                PFID(&lfsck->li_pos_current.lp_dir_parent),
4234                lfsck->li_pos_current.lp_dir_cookie, ns->ln_status, rc);
4235
4236         return rc > 0 ? 0 : rc;
4237 }
4238
4239 static int lfsck_namespace_prep(const struct lu_env *env,
4240                                 struct lfsck_component *com,
4241                                 struct lfsck_start_param *lsp)
4242 {
4243         struct lfsck_instance   *lfsck  = com->lc_lfsck;
4244         struct lfsck_namespace  *ns     = com->lc_file_ram;
4245         struct lfsck_position   *pos    = &com->lc_pos_start;
4246         int                      rc;
4247
4248         rc = lfsck_namespace_load_bitmap(env, com);
4249         if (rc != 0 || ns->ln_status == LS_COMPLETED) {
4250                 rc = lfsck_namespace_reset(env, com, false);
4251                 if (rc == 0)
4252                         rc = lfsck_set_param(env, lfsck, lsp->lsp_start, true);
4253
4254                 if (rc != 0) {
4255                         CDEBUG(D_LFSCK, "%s: namespace LFSCK prep failed: "
4256                                "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
4257
4258                         return rc;
4259                 }
4260         }
4261
4262         down_write(&com->lc_sem);
4263         ns->ln_time_latest_start = ktime_get_real_seconds();
4264         spin_lock(&lfsck->li_lock);
4265
4266         if (ns->ln_flags & LF_SCANNED_ONCE) {
4267                 if (!lfsck->li_drop_dryrun ||
4268                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
4269                         ns->ln_status = LS_SCANNING_PHASE2;
4270                         list_move_tail(&com->lc_link,
4271                                        &lfsck->li_list_double_scan);
4272                         if (!list_empty(&com->lc_link_dir))
4273                                 list_del_init(&com->lc_link_dir);
4274                         lfsck_pos_set_zero(pos);
4275                 } else {
4276                         ns->ln_status = LS_SCANNING_PHASE1;
4277                         ns->ln_run_time_phase1 = 0;
4278                         ns->ln_run_time_phase2 = 0;
4279                         ns->ln_items_checked = 0;
4280                         ns->ln_items_repaired = 0;
4281                         ns->ln_items_failed = 0;
4282                         ns->ln_dirs_checked = 0;
4283                         ns->ln_objs_checked_phase2 = 0;
4284                         ns->ln_objs_repaired_phase2 = 0;
4285                         ns->ln_objs_failed_phase2 = 0;
4286                         ns->ln_objs_nlink_repaired = 0;
4287                         ns->ln_dirent_repaired = 0;
4288                         ns->ln_linkea_repaired = 0;
4289                         ns->ln_mul_linked_checked = 0;
4290                         ns->ln_mul_linked_repaired = 0;
4291                         ns->ln_unknown_inconsistency = 0;
4292                         ns->ln_unmatched_pairs_repaired = 0;
4293                         ns->ln_dangling_repaired = 0;
4294                         ns->ln_mul_ref_repaired = 0;
4295                         ns->ln_bad_type_repaired = 0;
4296                         ns->ln_lost_dirent_repaired = 0;
4297                         ns->ln_striped_dirs_scanned = 0;
4298                         ns->ln_striped_dirs_repaired = 0;
4299                         ns->ln_striped_dirs_failed = 0;
4300                         ns->ln_striped_dirs_disabled = 0;
4301                         ns->ln_striped_dirs_skipped = 0;
4302                         ns->ln_striped_shards_scanned = 0;
4303                         ns->ln_striped_shards_repaired = 0;
4304                         ns->ln_striped_shards_failed = 0;
4305                         ns->ln_striped_shards_skipped = 0;
4306                         ns->ln_name_hash_repaired = 0;
4307                         fid_zero(&ns->ln_fid_latest_scanned_phase2);
4308                         if (list_empty(&com->lc_link_dir))
4309                                 list_add_tail(&com->lc_link_dir,
4310                                               &lfsck->li_list_dir);
4311                         *pos = ns->ln_pos_first_inconsistent;
4312                 }
4313         } else {
4314                 ns->ln_status = LS_SCANNING_PHASE1;
4315                 if (list_empty(&com->lc_link_dir))
4316                         list_add_tail(&com->lc_link_dir,
4317                                       &lfsck->li_list_dir);
4318                 if (!lfsck->li_drop_dryrun ||
4319                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
4320                         *pos = ns->ln_pos_last_checkpoint;
4321                         pos->lp_oit_cookie++;
4322                 } else {
4323                         *pos = ns->ln_pos_first_inconsistent;
4324                 }
4325         }
4326
4327         spin_unlock(&lfsck->li_lock);
4328         up_write(&com->lc_sem);
4329
4330         rc = lfsck_start_assistant(env, com, lsp);
4331
4332         CDEBUG(D_LFSCK, "%s: namespace LFSCK prep done, start pos [%llu, "
4333                DFID", %#llx]: rc = %d\n",
4334                lfsck_lfsck2name(lfsck), pos->lp_oit_cookie,
4335                PFID(&pos->lp_dir_parent), pos->lp_dir_cookie, rc);
4336
4337         return rc;
4338 }
4339
4340 static int lfsck_namespace_exec_oit(const struct lu_env *env,
4341                                     struct lfsck_component *com,
4342                                     struct dt_object *obj)
4343 {
4344         struct lfsck_thread_info *info  = lfsck_env_info(env);
4345         struct lfsck_namespace   *ns    = com->lc_file_ram;
4346         struct lfsck_instance    *lfsck = com->lc_lfsck;
4347         const struct lu_fid      *fid   = lfsck_dto2fid(obj);
4348         struct lu_fid            *pfid  = &info->lti_fid2;
4349         struct lu_name           *cname = &info->lti_name;
4350         struct lu_seq_range      *range = &info->lti_range;
4351         struct seq_server_site   *ss    = lfsck_dev_site(lfsck);
4352         struct linkea_data        ldata = { NULL };
4353         __u32                     idx   = lfsck_dev_idx(lfsck);
4354         int                       rc;
4355         bool remote = false;
4356         ENTRY;
4357
4358         rc = lfsck_links_read(env, obj, &ldata);
4359         if (rc == -ENOENT)
4360                 GOTO(out, rc = 0);
4361
4362         /* -EINVAL means crashed linkEA, should be verified. */
4363         if (rc == -EINVAL) {
4364                 rc = lfsck_namespace_trace_update(env, com, fid,
4365                                                   LNTF_CHECK_LINKEA, true);
4366                 if (rc == 0) {
4367                         struct lustre_handle lh = { 0 };
4368
4369                         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
4370                                               MDS_INODELOCK_UPDATE |
4371                                               MDS_INODELOCK_XATTR, LCK_EX);
4372                         if (rc == 0) {
4373                                 rc = lfsck_namespace_links_remove(env, com,
4374                                                                   obj);
4375                                 lfsck_ibits_unlock(&lh, LCK_EX);
4376                         }
4377                 }
4378
4379                 GOTO(out, rc = (rc == -ENOENT ? 0 : rc));
4380         }
4381
4382         if (rc && rc != -ENODATA)
4383                 GOTO(out, rc);
4384
4385         if (rc == -ENODATA || unlikely(!ldata.ld_leh->leh_reccount)) {
4386                 rc = lfsck_namespace_check_for_double_scan(env, com, obj);
4387
4388                 GOTO(out, rc);
4389         }
4390
4391         linkea_first_entry(&ldata);
4392         while (ldata.ld_lee != NULL) {
4393                 linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen,
4394                                     cname, pfid);
4395                 if (!fid_is_sane(pfid)) {
4396                         rc = lfsck_namespace_trace_update(env, com, fid,
4397                                                   LNTF_CHECK_PARENT, true);
4398                 } else {
4399                         fld_range_set_mdt(range);
4400                         rc = fld_server_lookup(env, ss->ss_server_fld,
4401                                                fid_seq(pfid), range);
4402                         if ((rc == -ENOENT) ||
4403                             (!rc && range->lsr_index != idx)) {
4404                                 remote = true;
4405                                 break;
4406                         }
4407                 }
4408                 if (rc)
4409                         GOTO(out, rc);
4410
4411                 linkea_next_entry(&ldata);
4412         }
4413
4414         if ((lu_object_has_agent_entry(&obj->do_lu) && !remote) ||
4415             (!lu_object_has_agent_entry(&obj->do_lu) && remote)) {
4416                 rc = lfsck_namespace_trace_update(env, com, fid,
4417                                                   LNTF_CHECK_AGENT_ENTRY, true);
4418                 if (rc)
4419                         GOTO(out, rc);
4420         }
4421
4422         /* Record multiple-linked object. */
4423         if (ldata.ld_leh->leh_reccount > 1) {
4424                 rc = lfsck_namespace_trace_update(env, com, fid,
4425                                                   LNTF_CHECK_LINKEA, true);
4426
4427                 GOTO(out, rc);
4428         }
4429
4430         if (remote)
4431                 rc = lfsck_namespace_trace_update(env, com, fid,
4432                                                   LNTF_CHECK_LINKEA, true);
4433         else
4434                 rc = lfsck_namespace_check_for_double_scan(env, com, obj);
4435
4436         GOTO(out, rc);
4437
4438 out:
4439         down_write(&com->lc_sem);
4440         if (S_ISDIR(lfsck_object_type(obj)))
4441                 ns->ln_dirs_checked++;
4442         if (rc != 0)
4443                 lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
4444         up_write(&com->lc_sem);
4445
4446         return rc;
4447 }
4448
4449 static int lfsck_namespace_exec_dir(const struct lu_env *env,
4450                                     struct lfsck_component *com,
4451                                     struct lfsck_assistant_object *lso,
4452                                     struct lu_dirent *ent, __u16 type)
4453 {
4454         struct lfsck_assistant_data     *lad     = com->lc_data;
4455         struct lfsck_instance           *lfsck   = com->lc_lfsck;
4456         struct lfsck_namespace_req      *lnr;
4457         struct lfsck_bookmark           *bk      = &lfsck->li_bookmark_ram;
4458         struct ptlrpc_thread            *mthread = &lfsck->li_thread;
4459         struct ptlrpc_thread            *athread = &lad->lad_thread;
4460         struct l_wait_info               lwi     = { 0 };
4461         bool                             wakeup  = false;
4462
4463         l_wait_event(mthread->t_ctl_waitq,
4464                      lad->lad_prefetched < bk->lb_async_windows ||
4465                      !thread_is_running(mthread) ||
4466                      !thread_is_running(athread),
4467                      &lwi);
4468
4469         if (unlikely(!thread_is_running(mthread) ||
4470                      !thread_is_running(athread)))
4471                 return 0;
4472
4473         if (unlikely(lfsck_is_dead_obj(lfsck->li_obj_dir)))
4474                 return 0;
4475
4476         lnr = lfsck_namespace_assistant_req_init(com->lc_lfsck, lso, ent, type);
4477         if (IS_ERR(lnr)) {
4478                 struct lfsck_namespace *ns = com->lc_file_ram;
4479
4480                 lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
4481                 return PTR_ERR(lnr);
4482         }
4483
4484         spin_lock(&lad->lad_lock);
4485         if (lad->lad_assistant_status < 0 ||
4486             unlikely(!thread_is_running(mthread) ||
4487                      !thread_is_running(athread))) {
4488                 spin_unlock(&lad->lad_lock);
4489                 lfsck_namespace_assistant_req_fini(env, &lnr->lnr_lar);
4490                 return lad->lad_assistant_status;
4491         }
4492
4493         list_add_tail(&lnr->lnr_lar.lar_list, &lad->lad_req_list);
4494         if (lad->lad_prefetched == 0)
4495                 wakeup = true;
4496
4497         lad->lad_prefetched++;
4498         spin_unlock(&lad->lad_lock);
4499         if (wakeup)
4500                 wake_up_all(&lad->lad_thread.t_ctl_waitq);
4501
4502         down_write(&com->lc_sem);
4503         com->lc_new_checked++;
4504         up_write(&com->lc_sem);
4505
4506         return 0;
4507 }
4508
4509 static int lfsck_namespace_post(const struct lu_env *env,
4510                                 struct lfsck_component *com,
4511                                 int result, bool init)
4512 {
4513         struct lfsck_instance   *lfsck = com->lc_lfsck;
4514         struct lfsck_namespace  *ns    = com->lc_file_ram;
4515         int                      rc;
4516         ENTRY;
4517
4518         lfsck_post_generic(env, com, &result);
4519
4520         down_write(&com->lc_sem);
4521         lfsck_namespace_release_lmv(env, com);
4522
4523         spin_lock(&lfsck->li_lock);
4524         if (!init)
4525                 ns->ln_pos_last_checkpoint = lfsck->li_pos_checkpoint;
4526         if (result > 0) {
4527                 ns->ln_status = LS_SCANNING_PHASE2;
4528                 ns->ln_flags |= LF_SCANNED_ONCE;
4529                 ns->ln_flags &= ~LF_UPGRADE;
4530                 list_del_init(&com->lc_link_dir);
4531                 list_move_tail(&com->lc_link, &lfsck->li_list_double_scan);
4532         } else if (result == 0) {
4533                 if (lfsck->li_status != 0)
4534                         ns->ln_status = lfsck->li_status;
4535                 else
4536                         ns->ln_status = LS_STOPPED;
4537                 if (ns->ln_status != LS_PAUSED) {
4538                         list_del_init(&com->lc_link_dir);
4539                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4540                 }
4541         } else {
4542                 ns->ln_status = LS_FAILED;
4543                 list_del_init(&com->lc_link_dir);
4544                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4545         }
4546         spin_unlock(&lfsck->li_lock);
4547
4548         if (!init) {
4549                 ns->ln_run_time_phase1 += ktime_get_seconds() -
4550                                           lfsck->li_time_last_checkpoint;
4551                 ns->ln_time_last_checkpoint = ktime_get_real_seconds();
4552                 ns->ln_items_checked += com->lc_new_checked;
4553                 com->lc_new_checked = 0;
4554         }
4555
4556         rc = lfsck_namespace_store(env, com);
4557         up_write(&com->lc_sem);
4558
4559         CDEBUG(D_LFSCK, "%s: namespace LFSCK post done: rc = %d\n",
4560                lfsck_lfsck2name(lfsck), rc);
4561
4562         RETURN(rc);
4563 }
4564
4565 static void
4566 lfsck_namespace_dump(const struct lu_env *env, struct lfsck_component *com,
4567                      struct seq_file *m)
4568 {
4569         struct lfsck_instance   *lfsck = com->lc_lfsck;
4570         struct lfsck_bookmark   *bk    = &lfsck->li_bookmark_ram;
4571         struct lfsck_namespace  *ns    = com->lc_file_ram;
4572
4573         down_read(&com->lc_sem);
4574         seq_printf(m, "name: lfsck_namespace\n"
4575                    "magic: %#x\n"
4576                    "version: %d\n"
4577                    "status: %s\n",
4578                    ns->ln_magic,
4579                    bk->lb_version,
4580                    lfsck_status2name(ns->ln_status));
4581
4582         lfsck_bits_dump(m, ns->ln_flags, lfsck_flags_names, "flags");
4583
4584         lfsck_bits_dump(m, bk->lb_param, lfsck_param_names, "param");
4585
4586         lfsck_time_dump(m, ns->ln_time_last_complete, "last_completed");
4587
4588         lfsck_time_dump(m, ns->ln_time_latest_start, "latest_start");
4589
4590         lfsck_time_dump(m, ns->ln_time_last_checkpoint, "last_checkpoint");
4591
4592         lfsck_pos_dump(m, &ns->ln_pos_latest_start, "latest_start_position");
4593
4594         lfsck_pos_dump(m, &ns->ln_pos_last_checkpoint,
4595                        "last_checkpoint_position");
4596
4597         lfsck_pos_dump(m, &ns->ln_pos_first_inconsistent,
4598                        "first_failure_position");
4599
4600         if (ns->ln_status == LS_SCANNING_PHASE1) {
4601                 struct lfsck_position pos;
4602                 time64_t duration = ktime_get_seconds() -
4603                                     lfsck->li_time_last_checkpoint;
4604                 u64 checked = ns->ln_items_checked + com->lc_new_checked;
4605                 u64 speed = checked;
4606                 u64 new_checked = com->lc_new_checked;
4607                 time64_t rtime = ns->ln_run_time_phase1 + duration;
4608
4609                 if (duration != 0)
4610                         new_checked = div64_s64(new_checked, duration);
4611
4612                 if (rtime != 0)
4613                         speed = div64_s64(speed, rtime);
4614
4615                 lfsck_namespace_dump_statistics(m, ns, checked, 0, rtime, 0,
4616                                                 bk->lb_param & LPF_DRYRUN);
4617                 seq_printf(m, "average_speed_phase1: %llu items/sec\n"
4618                            "average_speed_phase2: N/A\n"
4619                            "average_speed_total: %llu items/sec\n"
4620                            "real_time_speed_phase1: %llu items/sec\n"
4621                            "real_time_speed_phase2: N/A\n",
4622                            speed,
4623                            speed,
4624                            new_checked);
4625
4626                 if (likely(lfsck->li_di_oit)) {
4627                         const struct dt_it_ops *iops =
4628                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
4629
4630                         /* The low layer otable-based iteration position may NOT
4631                          * exactly match the namespace-based directory traversal
4632                          * cookie. Generally, it is not a serious issue. But the
4633                          * caller should NOT make assumption on that. */
4634                         pos.lp_oit_cookie = iops->store(env, lfsck->li_di_oit);
4635                         if (!lfsck->li_current_oit_processed)
4636                                 pos.lp_oit_cookie--;
4637
4638                         spin_lock(&lfsck->li_lock);
4639                         if (lfsck->li_di_dir) {
4640                                 pos.lp_dir_cookie = lfsck->li_cookie_dir;
4641                                 if (pos.lp_dir_cookie >= MDS_DIR_END_OFF) {
4642                                         fid_zero(&pos.lp_dir_parent);
4643                                         pos.lp_dir_cookie = 0;
4644                                 } else {
4645                                         pos.lp_dir_parent =
4646                                         *lfsck_dto2fid(lfsck->li_obj_dir);
4647                                 }
4648                         } else {
4649                                 fid_zero(&pos.lp_dir_parent);
4650                                 pos.lp_dir_cookie = 0;
4651                         }
4652                         spin_unlock(&lfsck->li_lock);
4653                 } else {
4654                         pos = ns->ln_pos_last_checkpoint;
4655                 }
4656
4657                 lfsck_pos_dump(m, &pos, "current_position");
4658         } else if (ns->ln_status == LS_SCANNING_PHASE2) {
4659                 time64_t duration = ktime_get_seconds() -
4660                                     com->lc_time_last_checkpoint;
4661                 __u64 checked = ns->ln_objs_checked_phase2 +
4662                                 com->lc_new_checked;
4663                 __u64 speed1 = ns->ln_items_checked;
4664                 __u64 speed2 = checked;
4665                 __u64 speed0 = speed1 + speed2;
4666                 __u64 new_checked = com->lc_new_checked;
4667                 time64_t rtime = ns->ln_run_time_phase2 + duration;
4668                 time64_t time0 = ns->ln_run_time_phase1 + rtime;
4669
4670                 if (duration != 0)
4671                         new_checked = div64_s64(new_checked, duration);
4672
4673                 if (ns->ln_run_time_phase1 != 0)
4674                         speed1 = div64_s64(speed1, ns->ln_run_time_phase1);
4675                 else if (ns->ln_items_checked != 0)
4676                         time0++;
4677
4678                 if (rtime != 0)
4679                         speed2 = div64_s64(speed2, rtime);
4680                 else if (checked != 0)
4681                         time0++;
4682
4683                 if (time0 != 0)
4684                         speed0 = div64_s64(speed0, time0);
4685
4686                 lfsck_namespace_dump_statistics(m, ns, ns->ln_items_checked,
4687                                                 checked,
4688                                                 ns->ln_run_time_phase1, rtime,
4689                                                 bk->lb_param & LPF_DRYRUN);
4690                 seq_printf(m, "average_speed_phase1: %llu items/sec\n"
4691                            "average_speed_phase2: %llu objs/sec\n"
4692                            "average_speed_total: %llu items/sec\n"
4693                            "real_time_speed_phase1: N/A\n"
4694                            "real_time_speed_phase2: %llu objs/sec\n"
4695                            "current_position: "DFID"\n",
4696                            speed1,
4697                            speed2,
4698                            speed0,
4699                            new_checked,
4700                            PFID(&ns->ln_fid_latest_scanned_phase2));
4701         } else {
4702                 __u64 speed1 = ns->ln_items_checked;
4703                 __u64 speed2 = ns->ln_objs_checked_phase2;
4704                 __u64 speed0 = speed1 + speed2;
4705                 time64_t time0 = ns->ln_run_time_phase1 + ns->ln_run_time_phase2;
4706
4707                 if (ns->ln_run_time_phase1 != 0)
4708                         speed1 = div64_s64(speed1, ns->ln_run_time_phase1);
4709                 else if (ns->ln_items_checked != 0)
4710                         time0++;
4711
4712                 if (ns->ln_run_time_phase2 != 0)
4713                         speed2 = div64_s64(speed2, ns->ln_run_time_phase2);
4714                 else if (ns->ln_objs_checked_phase2 != 0)
4715                         time0++;
4716
4717                 if (time0 != 0)
4718                         speed0 = div64_s64(speed0, time0);
4719
4720                 lfsck_namespace_dump_statistics(m, ns, ns->ln_items_checked,
4721                                                 ns->ln_objs_checked_phase2,
4722                                                 ns->ln_run_time_phase1,
4723                                                 ns->ln_run_time_phase2,
4724                                                 bk->lb_param & LPF_DRYRUN);
4725                 seq_printf(m, "average_speed_phase1: %llu items/sec\n"
4726                            "average_speed_phase2: %llu objs/sec\n"
4727                            "average_speed_total: %llu items/sec\n"
4728                            "real_time_speed_phase1: N/A\n"
4729                            "real_time_speed_phase2: N/A\n"
4730                            "current_position: N/A\n",
4731                            speed1,
4732                            speed2,
4733                            speed0);
4734         }
4735
4736         up_read(&com->lc_sem);
4737 }
4738
4739 static int lfsck_namespace_double_scan(const struct lu_env *env,
4740                                        struct lfsck_component *com)
4741 {
4742         struct lfsck_namespace          *ns     = com->lc_file_ram;
4743         struct lfsck_assistant_data     *lad    = com->lc_data;
4744         struct lfsck_tgt_descs          *ltds   = &com->lc_lfsck->li_mdt_descs;
4745         struct lfsck_tgt_desc           *ltd;
4746         struct lfsck_tgt_desc           *next;
4747         int                              rc;
4748
4749         rc = lfsck_double_scan_generic(env, com, ns->ln_status);
4750         if (thread_is_stopped(&lad->lad_thread)) {
4751                 LASSERT(list_empty(&lad->lad_req_list));
4752                 LASSERT(list_empty(&lad->lad_mdt_phase1_list));
4753
4754                 spin_lock(&ltds->ltd_lock);
4755                 list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
4756                                          ltd_namespace_phase_list) {
4757                         list_del_init(&ltd->ltd_namespace_phase_list);
4758                 }
4759                 spin_unlock(&ltds->ltd_lock);
4760         }
4761
4762         return rc;
4763 }
4764
4765 static void lfsck_namespace_data_release(const struct lu_env *env,
4766                                          struct lfsck_component *com)
4767 {
4768         struct lfsck_assistant_data     *lad    = com->lc_data;
4769         struct lfsck_tgt_descs          *ltds   = &com->lc_lfsck->li_mdt_descs;
4770         struct lfsck_tgt_desc           *ltd;
4771         struct lfsck_tgt_desc           *next;
4772
4773         LASSERT(lad != NULL);
4774         LASSERT(thread_is_init(&lad->lad_thread) ||
4775                 thread_is_stopped(&lad->lad_thread));
4776         LASSERT(list_empty(&lad->lad_req_list));
4777
4778         com->lc_data = NULL;
4779         lfsck_namespace_release_lmv(env, com);
4780
4781         spin_lock(&ltds->ltd_lock);
4782         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase1_list,
4783                                  ltd_namespace_phase_list) {
4784                 list_del_init(&ltd->ltd_namespace_phase_list);
4785         }
4786         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
4787                                  ltd_namespace_phase_list) {
4788                 list_del_init(&ltd->ltd_namespace_phase_list);
4789         }
4790         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_list,
4791                                  ltd_namespace_list) {
4792                 list_del_init(&ltd->ltd_namespace_list);
4793         }
4794         spin_unlock(&ltds->ltd_lock);
4795
4796         if (likely(lad->lad_bitmap != NULL))
4797                 CFS_FREE_BITMAP(lad->lad_bitmap);
4798
4799         OBD_FREE_PTR(lad);
4800 }
4801
4802 static void lfsck_namespace_quit(const struct lu_env *env,
4803                                  struct lfsck_component *com)
4804 {
4805         struct lfsck_assistant_data     *lad    = com->lc_data;
4806         struct lfsck_tgt_descs          *ltds   = &com->lc_lfsck->li_mdt_descs;
4807         struct lfsck_tgt_desc           *ltd;
4808         struct lfsck_tgt_desc           *next;
4809
4810         LASSERT(lad != NULL);
4811
4812         lfsck_quit_generic(env, com);
4813
4814         LASSERT(thread_is_init(&lad->lad_thread) ||
4815                 thread_is_stopped(&lad->lad_thread));
4816         LASSERT(list_empty(&lad->lad_req_list));
4817
4818         lfsck_namespace_release_lmv(env, com);
4819
4820         spin_lock(&ltds->ltd_lock);
4821         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase1_list,
4822                                  ltd_namespace_phase_list) {
4823                 list_del_init(&ltd->ltd_namespace_phase_list);
4824         }
4825         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
4826                                  ltd_namespace_phase_list) {
4827                 list_del_init(&ltd->ltd_namespace_phase_list);
4828         }
4829         spin_unlock(&ltds->ltd_lock);
4830 }
4831
4832 static int lfsck_namespace_in_notify(const struct lu_env *env,
4833                                      struct lfsck_component *com,
4834                                      struct lfsck_request *lr)
4835 {
4836         struct lfsck_instance *lfsck = com->lc_lfsck;
4837         struct lfsck_namespace *ns = com->lc_file_ram;
4838         struct lfsck_assistant_data *lad = com->lc_data;
4839         struct lfsck_tgt_descs *ltds = &lfsck->li_mdt_descs;
4840         struct lfsck_tgt_desc *ltd;
4841         int rc = 0;
4842         bool fail = false;
4843         ENTRY;
4844
4845         switch (lr->lr_event) {
4846         case LE_SET_LMV_MASTER: {
4847                 struct dt_object        *obj;
4848
4849                 obj = lfsck_object_find_bottom(env, lfsck, &lr->lr_fid);
4850                 if (IS_ERR(obj))
4851                         RETURN(PTR_ERR(obj));
4852
4853                 if (likely(dt_object_exists(obj)))
4854                         rc = lfsck_namespace_notify_lmv_master_local(env, com,
4855                                                                      obj);
4856
4857                 lfsck_object_put(env, obj);
4858
4859                 RETURN(rc > 0 ? 0 : rc);
4860         }
4861         case LE_SET_LMV_SLAVE: {
4862                 if (!(lr->lr_flags & LEF_RECHECK_NAME_HASH))
4863                         ns->ln_striped_shards_repaired++;
4864
4865                 rc = lfsck_namespace_trace_update(env, com, &lr->lr_fid,
4866                                                   LNTF_RECHECK_NAME_HASH, true);
4867
4868                 RETURN(rc > 0 ? 0 : rc);
4869         }
4870         case LE_PHASE1_DONE:
4871         case LE_PHASE2_DONE:
4872         case LE_PEER_EXIT:
4873                 break;
4874         default:
4875                 RETURN(-EINVAL);
4876         }
4877
4878         CDEBUG(D_LFSCK, "%s: namespace LFSCK handles notify %u from MDT %x, "
4879                "status %d, flags %x\n", lfsck_lfsck2name(lfsck), lr->lr_event,
4880                lr->lr_index, lr->lr_status, lr->lr_flags2);
4881
4882         spin_lock(&ltds->ltd_lock);
4883         ltd = lfsck_ltd2tgt(ltds, lr->lr_index);
4884         if (ltd == NULL) {
4885                 spin_unlock(&ltds->ltd_lock);
4886
4887                 RETURN(-ENXIO);
4888         }
4889
4890         list_del_init(&ltd->ltd_namespace_phase_list);
4891         switch (lr->lr_event) {
4892         case LE_PHASE1_DONE:
4893                 if (lr->lr_status <= 0) {
4894                         ltd->ltd_namespace_done = 1;
4895                         list_del_init(&ltd->ltd_namespace_list);
4896                         CDEBUG(D_LFSCK, "%s: MDT %x failed/stopped at "
4897                                "phase1 for namespace LFSCK: rc = %d.\n",
4898                                lfsck_lfsck2name(lfsck),
4899                                ltd->ltd_index, lr->lr_status);
4900                         ns->ln_flags |= LF_INCOMPLETE;
4901                         fail = true;
4902                         break;
4903                 }
4904
4905                 if (lr->lr_flags2 & LF_INCOMPLETE)
4906                         ns->ln_flags |= LF_INCOMPLETE;
4907
4908                 if (list_empty(&ltd->ltd_namespace_list))
4909                         list_add_tail(&ltd->ltd_namespace_list,
4910                                       &lad->lad_mdt_list);
4911                 list_add_tail(&ltd->ltd_namespace_phase_list,
4912                               &lad->lad_mdt_phase2_list);
4913                 break;
4914         case LE_PHASE2_DONE:
4915                 ltd->ltd_namespace_done = 1;
4916                 list_del_init(&ltd->ltd_namespace_list);
4917                 break;
4918         case LE_PEER_EXIT:
4919                 fail = true;
4920                 ltd->ltd_namespace_done = 1;
4921                 list_del_init(&ltd->ltd_namespace_list);
4922                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT)) {
4923                         CDEBUG(D_LFSCK,
4924                                "%s: the peer MDT %x exit namespace LFSCK\n",
4925                                lfsck_lfsck2name(lfsck), ltd->ltd_index);
4926                         ns->ln_flags |= LF_INCOMPLETE;
4927                 }
4928                 break;
4929         default:
4930                 break;
4931         }
4932         spin_unlock(&ltds->ltd_lock);
4933
4934         if (fail && lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT) {
4935                 struct lfsck_stop *stop = &lfsck_env_info(env)->lti_stop;
4936
4937                 memset(stop, 0, sizeof(*stop));
4938                 stop->ls_status = lr->lr_status;
4939                 stop->ls_flags = lr->lr_param & ~LPF_BROADCAST;
4940                 lfsck_stop(env, lfsck->li_bottom, stop);
4941         } else if (lfsck_phase2_next_ready(lad)) {
4942                 wake_up_all(&lad->lad_thread.t_ctl_waitq);
4943         }
4944
4945         RETURN(0);
4946 }
4947
4948 static void lfsck_namespace_repaired(struct lfsck_namespace *ns, __u64 *count)
4949 {
4950         *count += ns->ln_objs_nlink_repaired;
4951         *count += ns->ln_dirent_repaired;
4952         *count += ns->ln_linkea_repaired;
4953         *count += ns->ln_mul_linked_repaired;
4954         *count += ns->ln_unmatched_pairs_repaired;
4955         *count += ns->ln_dangling_repaired;
4956         *count += ns->ln_mul_ref_repaired;
4957         *count += ns->ln_bad_type_repaired;
4958         *count += ns->ln_lost_dirent_repaired;
4959         *count += ns->ln_striped_dirs_disabled;
4960         *count += ns->ln_striped_dirs_repaired;
4961         *count += ns->ln_striped_shards_repaired;
4962         *count += ns->ln_name_hash_repaired;
4963         *count += ns->ln_local_lpf_moved;
4964 }
4965
4966 static int lfsck_namespace_query_all(const struct lu_env *env,
4967                                      struct lfsck_component *com,
4968                                      __u32 *mdts_count, __u64 *repaired)
4969 {
4970         struct lfsck_namespace *ns = com->lc_file_ram;
4971         struct lfsck_tgt_descs *ltds = &com->lc_lfsck->li_mdt_descs;
4972         struct lfsck_tgt_desc *ltd;
4973         int idx;
4974         int rc;
4975         ENTRY;
4976
4977         rc = lfsck_query_all(env, com);
4978         if (rc != 0)
4979                 RETURN(rc);
4980
4981         down_read(&ltds->ltd_rw_sem);
4982         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
4983                 ltd = lfsck_ltd2tgt(ltds, idx);
4984                 LASSERT(ltd != NULL);
4985
4986                 mdts_count[ltd->ltd_namespace_status]++;
4987                 *repaired += ltd->ltd_namespace_repaired;
4988         }
4989         up_read(&ltds->ltd_rw_sem);
4990
4991         down_read(&com->lc_sem);
4992         mdts_count[ns->ln_status]++;
4993         lfsck_namespace_repaired(ns, repaired);
4994         up_read(&com->lc_sem);
4995
4996         RETURN(0);
4997 }
4998
4999 static int lfsck_namespace_query(const struct lu_env *env,
5000                                  struct lfsck_component *com,
5001                                  struct lfsck_request *req,
5002                                  struct lfsck_reply *rep,
5003                                  struct lfsck_query *que, int idx)
5004 {
5005         struct lfsck_namespace *ns = com->lc_file_ram;
5006         int rc = 0;
5007
5008         if (que != NULL) {
5009                 LASSERT(com->lc_lfsck->li_master);
5010
5011                 rc = lfsck_namespace_query_all(env, com,
5012                                                que->lu_mdts_count[idx],
5013                                                &que->lu_repaired[idx]);
5014         } else {
5015                 down_read(&com->lc_sem);
5016                 rep->lr_status = ns->ln_status;
5017                 if (req->lr_flags & LEF_QUERY_ALL)
5018                         lfsck_namespace_repaired(ns, &rep->lr_repaired);
5019                 up_read(&com->lc_sem);
5020         }
5021
5022         return rc;
5023 }
5024
5025 static struct lfsck_operations lfsck_namespace_ops = {
5026         .lfsck_reset            = lfsck_namespace_reset,
5027         .lfsck_fail             = lfsck_namespace_fail,
5028         .lfsck_close_dir        = lfsck_namespace_close_dir,
5029         .lfsck_open_dir         = lfsck_namespace_open_dir,
5030         .lfsck_checkpoint       = lfsck_namespace_checkpoint,
5031         .lfsck_prep             = lfsck_namespace_prep,
5032         .lfsck_exec_oit         = lfsck_namespace_exec_oit,
5033         .lfsck_exec_dir         = lfsck_namespace_exec_dir,
5034         .lfsck_post             = lfsck_namespace_post,
5035         .lfsck_dump             = lfsck_namespace_dump,
5036         .lfsck_double_scan      = lfsck_namespace_double_scan,
5037         .lfsck_data_release     = lfsck_namespace_data_release,
5038         .lfsck_quit             = lfsck_namespace_quit,
5039         .lfsck_in_notify        = lfsck_namespace_in_notify,
5040         .lfsck_query            = lfsck_namespace_query,
5041 };
5042
5043 /**
5044  * Repair dangling name entry.
5045  *
5046  * For the name entry with dangling reference, we need to repare the
5047  * inconsistency according to the LFSCK sponsor's requirement:
5048  *
5049  * 1) Keep the inconsistency there and report the inconsistency case,
5050  *    then give the chance to the application to find related issues,
5051  *    and the users can make the decision about how to handle it with
5052  *    more human knownledge. (by default)
5053  *
5054  * 2) Re-create the missing MDT-object with the FID information.
5055  *
5056  * \param[in] env       pointer to the thread context
5057  * \param[in] com       pointer to the lfsck component
5058  * \param[in] parent    pointer to the dir object that contains the dangling
5059  *                      name entry
5060  * \param[in] child     pointer to the object corresponding to the dangling
5061  *                      name entry
5062  * \param[in] lnr       pointer to the namespace request that contains the
5063  *                      name's name, parent object, parent's LMV, and ect.
5064  *
5065  * \retval              positive number if no need to repair
5066  * \retval              zero for repaired successfully
5067  * \retval              negative error number on failure
5068  */
5069 int lfsck_namespace_repair_dangling(const struct lu_env *env,
5070                                     struct lfsck_component *com,
5071                                     struct dt_object *parent,
5072                                     struct dt_object *child,
5073                                     struct lfsck_namespace_req *lnr)
5074 {
5075         struct lfsck_thread_info        *info   = lfsck_env_info(env);
5076         struct lu_attr                  *la     = &info->lti_la;
5077         struct dt_allocation_hint       *hint   = &info->lti_hint;
5078         struct dt_object_format         *dof    = &info->lti_dof;
5079         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
5080         struct lmv_mds_md_v1            *lmv2   = &info->lti_lmv2;
5081         const struct lu_name            *cname;
5082         const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
5083         const struct lu_fid             *cfid   = lfsck_dto2fid(child);
5084         struct linkea_data               ldata  = { NULL };
5085         struct lfsck_lock_handle        *llh    = &info->lti_llh;
5086         struct lu_buf                    linkea_buf;
5087         struct lu_buf                    lmv_buf;
5088         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5089         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
5090         struct dt_device                *dev    = lfsck->li_next;
5091         struct thandle                  *th     = NULL;
5092         int                              rc     = 0;
5093         __u16                            type   = lnr->lnr_type;
5094         bool                             create;
5095         ENTRY;
5096
5097         cname = lfsck_name_get_const(env, lnr->lnr_name, lnr->lnr_namelen);
5098         if (bk->lb_param & LPF_CREATE_MDTOBJ)
5099                 create = true;
5100         else
5101                 create = false;
5102
5103         if (!create || bk->lb_param & LPF_DRYRUN)
5104                 GOTO(log, rc = 0);
5105
5106         /* We may need to create the sub-objects of the @child via LOD,
5107          * so make the modification based on lfsck->li_next. */
5108
5109         parent = lfsck_object_locate(dev, parent);
5110         if (IS_ERR(parent))
5111                 GOTO(log, rc = PTR_ERR(parent));
5112
5113         if (unlikely(!dt_try_as_dir(env, parent)))
5114                 GOTO(log, rc = -ENOTDIR);
5115
5116         child = lfsck_object_locate(dev, child);
5117         if (IS_ERR(child))
5118                 GOTO(log, rc = PTR_ERR(child));
5119
5120         rc = linkea_links_new(&ldata, &info->lti_linkea_buf2,
5121                               cname, pfid);
5122         if (rc != 0)
5123                 GOTO(log, rc);
5124
5125         rc = lfsck_lock(env, lfsck, parent, lnr->lnr_name, llh,
5126                         MDS_INODELOCK_UPDATE, LCK_PR);
5127         if (rc != 0)
5128                 GOTO(log, rc);
5129
5130         rc = lfsck_namespace_check_exist(env, parent, child, lnr->lnr_name);
5131         if (rc != 0)
5132                 GOTO(log, rc);
5133
5134         /* Set the ctime as zero, then others can know it is created for
5135          * repairing dangling name entry by LFSCK. And if the LFSCK made
5136          * wrong decision and the real MDT-object has been found later,
5137          * then the LFSCK has chance to fix the incosistency properly. */
5138         memset(la, 0, sizeof(*la));
5139         la->la_mode = (type & S_IFMT) | 0600;
5140         la->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
5141                         LA_ATIME | LA_MTIME | LA_CTIME;
5142
5143         child->do_ops->do_ah_init(env, hint, parent, child,
5144                                  la->la_mode & S_IFMT);
5145
5146         memset(dof, 0, sizeof(*dof));
5147         dof->dof_type = dt_mode_to_dft(type);
5148         /* If the target is a regular file, then the LFSCK will only create
5149          * the MDT-object without stripes (dof->dof_reg.striped = 0). related
5150          * OST-objects will be created when write open. */
5151
5152         th = dt_trans_create(env, dev);
5153         if (IS_ERR(th))
5154                 GOTO(log, rc = PTR_ERR(th));
5155
5156         /* 1a. create child. */
5157         rc = dt_declare_create(env, child, la, hint, dof, th);
5158         if (rc != 0)
5159                 GOTO(stop, rc);
5160
5161         if (S_ISDIR(type)) {
5162                 if (unlikely(!dt_try_as_dir(env, child)))
5163                         GOTO(stop, rc = -ENOTDIR);
5164
5165                 /* 2a. increase child nlink */
5166                 rc = dt_declare_ref_add(env, child, th);
5167                 if (rc != 0)
5168                         GOTO(stop, rc);
5169
5170                 /* 3a. insert dot into child dir */
5171                 rec->rec_type = S_IFDIR;
5172                 rec->rec_fid = cfid;
5173                 rc = dt_declare_insert(env, child,
5174                                        (const struct dt_rec *)rec,
5175                                        (const struct dt_key *)dot, th);
5176                 if (rc != 0)
5177                         GOTO(stop, rc);
5178
5179                 /* 4a. insert dotdot into child dir */
5180                 rec->rec_fid = pfid;
5181                 rc = dt_declare_insert(env, child,
5182                                        (const struct dt_rec *)rec,
5183                                        (const struct dt_key *)dotdot, th);
5184                 if (rc != 0)
5185                         GOTO(stop, rc);
5186
5187                 /* 5a. generate slave LMV EA. */
5188                 if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
5189                         int idx;
5190
5191                         idx = lfsck_shard_name_to_index(env,
5192                                         lnr->lnr_name, lnr->lnr_namelen,
5193                                         type, cfid);
5194                         if (unlikely(idx < 0))
5195                                 GOTO(stop, rc = idx);
5196
5197                         *lmv2 = lnr->lnr_lmv->ll_lmv;
5198                         lmv2->lmv_magic = LMV_MAGIC_STRIPE;
5199                         lmv2->lmv_master_mdt_index = idx;
5200
5201                         lfsck_lmv_header_cpu_to_le(lmv2, lmv2);
5202                         lfsck_buf_init(&lmv_buf, lmv2, sizeof(*lmv2));
5203                         rc = dt_declare_xattr_set(env, child, &lmv_buf,
5204                                                   XATTR_NAME_LMV, 0, th);
5205                         if (rc != 0)
5206                                 GOTO(stop, rc);
5207                 }
5208         }
5209
5210         /* 6a. insert linkEA for child */
5211         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
5212                        ldata.ld_leh->leh_len);
5213         rc = dt_declare_xattr_set(env, child, &linkea_buf,
5214                                   XATTR_NAME_LINK, 0, th);
5215         if (rc != 0)
5216                 GOTO(stop, rc);
5217
5218         rc = dt_trans_start_local(env, dev, th);
5219         if (rc != 0)
5220                 GOTO(stop, rc = (rc == -EEXIST ? 1 : rc));
5221
5222         dt_write_lock(env, child, 0);
5223         /* 1b. create child */
5224         rc = dt_create(env, child, la, hint, dof, th);
5225         if (rc != 0)
5226                 GOTO(unlock, rc = (rc == -EEXIST ? 1 : rc));
5227
5228         if (S_ISDIR(type)) {
5229                 /* 2b. increase child nlink */
5230                 rc = dt_ref_add(env, child, th);
5231                 if (rc != 0)
5232                         GOTO(unlock, rc);
5233
5234                 /* 3b. insert dot into child dir */
5235                 rec->rec_type = S_IFDIR;
5236                 rec->rec_fid = cfid;
5237                 rc = dt_insert(env, child, (const struct dt_rec *)rec,
5238                                (const struct dt_key *)dot, th, 1);
5239                 if (rc != 0)
5240                         GOTO(unlock, rc);
5241
5242                 /* 4b. insert dotdot into child dir */
5243                 rec->rec_fid = pfid;
5244                 rc = dt_insert(env, child, (const struct dt_rec *)rec,
5245                                (const struct dt_key *)dotdot, th, 1);
5246                 if (rc != 0)
5247                         GOTO(unlock, rc);
5248
5249                 /* 5b. generate slave LMV EA. */
5250                 if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
5251                         rc = dt_xattr_set(env, child, &lmv_buf, XATTR_NAME_LMV,
5252                                           0, th);
5253                         if (rc != 0)
5254                                 GOTO(unlock, rc);
5255                 }
5256         }
5257
5258         /* 6b. insert linkEA for child. */
5259         rc = dt_xattr_set(env, child, &linkea_buf,
5260                           XATTR_NAME_LINK, 0, th);
5261
5262         GOTO(unlock, rc);
5263
5264 unlock:
5265         dt_write_unlock(env, child);
5266
5267 stop:
5268         dt_trans_stop(env, dev, th);
5269
5270 log:
5271         lfsck_unlock(llh);
5272         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found dangling "
5273                "reference for: parent "DFID", child "DFID", type %u, "
5274                "name %s. %s: rc = %d\n", lfsck_lfsck2name(lfsck),
5275                PFID(pfid), PFID(cfid), type, cname->ln_name,
5276                create ? "Create the lost MDT-object as required" :
5277                         "Keep the MDT-object there by default", rc);
5278
5279         if (rc <= 0) {
5280                 struct lfsck_namespace *ns = com->lc_file_ram;
5281
5282                 ns->ln_flags |= LF_INCONSISTENT;
5283         }
5284
5285         return rc;
5286 }
5287
5288 static int lfsck_namespace_assistant_handler_p1(const struct lu_env *env,
5289                                                 struct lfsck_component *com,
5290                                                 struct lfsck_assistant_req *lar)
5291 {
5292         struct lfsck_thread_info   *info     = lfsck_env_info(env);
5293         struct lu_attr             *la       = &info->lti_la;
5294         struct lfsck_instance      *lfsck    = com->lc_lfsck;
5295         struct lfsck_bookmark      *bk       = &lfsck->li_bookmark_ram;
5296         struct lfsck_namespace     *ns       = com->lc_file_ram;
5297         struct lfsck_assistant_data *lad     = com->lc_data;
5298         struct linkea_data          ldata    = { NULL };
5299         const struct lu_name       *cname;
5300         struct thandle             *handle   = NULL;
5301         struct lfsck_namespace_req *lnr      =
5302                         container_of0(lar, struct lfsck_namespace_req, lnr_lar);
5303         struct dt_object           *dir      = NULL;
5304         struct dt_object           *obj      = NULL;
5305         struct lfsck_assistant_object *lso   = lar->lar_parent;
5306         const struct lu_fid        *pfid     = &lso->lso_fid;
5307         struct dt_device           *dev      = NULL;
5308         struct lustre_handle        lh       = { 0 };
5309         bool                        repaired = false;
5310         bool                        dtlocked = false;
5311         bool                        remove;
5312         bool                        newdata;
5313         bool                        log      = false;
5314         bool                        bad_hash = false;
5315         bool                        bad_linkea = false;
5316         int                         idx      = 0;
5317         int                         count    = 0;
5318         int                         rc       = 0;
5319         enum lfsck_namespace_inconsistency_type type = LNIT_NONE;
5320         ENTRY;
5321
5322         if (lso->lso_dead)
5323                 RETURN(0);
5324
5325         la->la_nlink = 0;
5326         if (lnr->lnr_attr & LUDA_UPGRADE) {
5327                 ns->ln_flags |= LF_UPGRADE;
5328                 ns->ln_dirent_repaired++;
5329                 repaired = true;
5330         } else if (lnr->lnr_attr & LUDA_REPAIR) {
5331                 ns->ln_flags |= LF_INCONSISTENT;
5332                 ns->ln_dirent_repaired++;
5333                 repaired = true;
5334         }
5335
5336         if (unlikely(fid_is_zero(&lnr->lnr_fid))) {
5337                 if (strcmp(lnr->lnr_name, dotdot) != 0)
5338                         LBUG();
5339                 else
5340                         rc = lfsck_namespace_trace_update(env, com, pfid,
5341                                                 LNTF_CHECK_PARENT, true);
5342
5343                 GOTO(out, rc);
5344         }
5345
5346         if (unlikely(!fid_is_sane(&lnr->lnr_fid))) {
5347                 CDEBUG(D_LFSCK, "%s: dir scan find invalid FID "DFID
5348                        " for the name entry %.*s under "DFID"\n",
5349                        lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid),
5350                        lnr->lnr_namelen, lnr->lnr_name, PFID(pfid));
5351
5352                 if (strcmp(lnr->lnr_name, dotdot) != 0)
5353                         /* invalid FID means bad name entry, remove it. */
5354                         type = LNIT_BAD_DIRENT;
5355                 else
5356                         /* If the parent FID is invalid, we cannot remove
5357                          * the ".." entry directly. */
5358                         rc = lfsck_namespace_trace_update(env, com, pfid,
5359                                                 LNTF_CHECK_PARENT, true);
5360
5361                 GOTO(out, rc);
5362         }
5363
5364         if (unlikely(lnr->lnr_dir_cookie == MDS_DIR_END_OFF)) {
5365                 rc = lfsck_namespace_striped_dir_rescan(env, com, lnr);
5366
5367                 RETURN(rc);
5368         }
5369
5370         if (fid_seq_is_dot(fid_seq(&lnr->lnr_fid)))
5371                 GOTO(out, rc = 0);
5372
5373         if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
5374                 rc = lfsck_namespace_handle_striped_master(env, com, lnr);
5375
5376                 RETURN(rc);
5377         }
5378
5379         idx = lfsck_find_mdt_idx_by_fid(env, lfsck, &lnr->lnr_fid);
5380         if (idx < 0)
5381                 GOTO(out, rc = idx);
5382
5383         if (idx == lfsck_dev_idx(lfsck)) {
5384                 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0))
5385                         GOTO(out, rc = 0);
5386
5387                 dev = lfsck->li_bottom;
5388         } else {
5389                 struct lfsck_tgt_desc *ltd;
5390
5391                 /* Usually, some local filesystem consistency verification
5392                  * tools can guarantee the local namespace tree consistenct.
5393                  * So the LFSCK will only verify the remote directory. */
5394                 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0)) {
5395                         rc = lfsck_namespace_trace_update(env, com, pfid,
5396                                                 LNTF_CHECK_PARENT, true);
5397
5398                         GOTO(out, rc);
5399                 }
5400
5401                 ltd = lfsck_ltd2tgt(&lfsck->li_mdt_descs, idx);
5402                 if (unlikely(ltd == NULL)) {
5403                         CDEBUG(D_LFSCK, "%s: cannot talk with MDT %x which "
5404                                "did not join the namespace LFSCK\n",
5405                                lfsck_lfsck2name(lfsck), idx);
5406                         lfsck_lad_set_bitmap(env, com, idx);
5407
5408                         GOTO(out, rc = -ENODEV);
5409                 }
5410
5411                 dev = ltd->ltd_tgt;
5412         }
5413
5414         obj = lfsck_object_find_by_dev(env, dev, &lnr->lnr_fid);
5415         if (IS_ERR(obj))
5416                 GOTO(out, rc = PTR_ERR(obj));
5417
5418         cname = lfsck_name_get_const(env, lnr->lnr_name, lnr->lnr_namelen);
5419         if (dt_object_exists(obj) == 0) {
5420
5421 dangling:
5422                 if (dir == NULL) {
5423                         dir = lfsck_assistant_object_load(env, lfsck, lso);
5424                         if (IS_ERR(dir)) {
5425                                 rc = PTR_ERR(dir);
5426
5427                                 GOTO(trace, rc == -ENOENT ? 0 : rc);
5428                         }
5429                 }
5430
5431                 rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
5432                 if (rc == 0) {
5433                         if (!lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
5434                                         lnr->lnr_name, lnr->lnr_namelen)) {
5435                                 type = LNIT_BAD_DIRENT;
5436
5437                                 GOTO(out, rc);
5438                         }
5439
5440                         type = LNIT_DANGLING;
5441                         rc = lfsck_namespace_repair_dangling(env, com, dir,
5442                                                              obj, lnr);
5443                         if (rc == 0)
5444                                 repaired = true;
5445                 }
5446
5447                 GOTO(out, rc);
5448         }
5449
5450         if (!(bk->lb_param & LPF_DRYRUN) && lad->lad_advance_lock) {
5451
5452 again:
5453                 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
5454                                       MDS_INODELOCK_UPDATE |
5455                                       MDS_INODELOCK_XATTR, LCK_EX);
5456                 if (rc != 0)
5457                         GOTO(out, rc);
5458
5459                 handle = dt_trans_create(env, dev);
5460                 if (IS_ERR(handle))
5461                         GOTO(out, rc = PTR_ERR(handle));
5462
5463                 rc = lfsck_declare_namespace_exec_dir(env, obj, handle);
5464                 if (rc != 0)
5465                         GOTO(stop, rc);
5466
5467                 rc = dt_trans_start_local(env, dev, handle);
5468                 if (rc != 0)
5469                         GOTO(stop, rc);
5470
5471                 dt_write_lock(env, obj, 0);
5472                 dtlocked = true;
5473         }
5474
5475         rc = lfsck_links_read(env, obj, &ldata);
5476         if (unlikely(rc == -ENOENT)) {
5477                 if (handle != NULL) {
5478                         dt_write_unlock(env, obj);
5479                         dtlocked = false;
5480
5481                         dt_trans_stop(env, dev, handle);
5482                         handle = NULL;
5483
5484                         lfsck_ibits_unlock(&lh, LCK_EX);
5485                 }
5486
5487                 /* It may happen when the remote object has been removed,
5488                  * but the local MDT is not aware of that. */
5489                 goto dangling;
5490         } else if (rc == 0) {
5491                 count = ldata.ld_leh->leh_reccount;
5492                 rc = linkea_links_find(&ldata, cname, pfid);
5493                 if ((rc == 0) &&
5494                     (count == 1 || !S_ISDIR(lfsck_object_type(obj)))) {
5495                         if ((lfsck_object_type(obj) & S_IFMT) !=
5496                             lnr->lnr_type) {
5497                                 ns->ln_flags |= LF_INCONSISTENT;
5498                                 type = LNIT_BAD_TYPE;
5499                         }
5500
5501                         goto stop;
5502                 }
5503
5504                 /* If the name entry hash does not match the slave striped
5505                  * directory, and the name entry does not match also, then
5506                  * it is quite possible that name entry is corrupted. */
5507                 if (!lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
5508                                         lnr->lnr_name, lnr->lnr_namelen)) {
5509                         ns->ln_flags |= LF_INCONSISTENT;
5510                         type = LNIT_BAD_DIRENT;
5511
5512                         GOTO(stop, rc = 0);
5513                 }
5514
5515                 /* If the file type stored in the name entry does not match
5516                  * the file type claimed by the object, and the object does
5517                  * not recognize the name entry, then it is quite possible
5518                  * that the name entry is corrupted. */
5519                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type) {
5520                         ns->ln_flags |= LF_INCONSISTENT;
5521                         type = LNIT_BAD_DIRENT;
5522
5523                         GOTO(stop, rc = 0);
5524                 }
5525
5526                 /* For sub-dir object, we cannot make sure whether the sub-dir
5527                  * back references the parent via ".." name entry correctly or
5528                  * not in the LFSCK first-stage scanning. It may be that the
5529                  * (remote) sub-dir ".." name entry has no parent FID after
5530                  * file-level backup/restore and its linkEA may be wrong.
5531                  * So under such case, we should replace the linkEA according
5532                  * to current name entry. But this needs to be done during the
5533                  * LFSCK second-stage scanning. The LFSCK will record the name
5534                  * entry for further possible using. */
5535                 remove = false;
5536                 newdata = false;
5537                 goto nodata;
5538         } else if (unlikely(rc == -EINVAL)) {
5539                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type)
5540                         type = LNIT_BAD_TYPE;
5541
5542                 count = 1;
5543                 /* The magic crashed, we are not sure whether there are more
5544                  * corrupt data in the linkea, so remove all linkea entries. */
5545                 remove = true;
5546                 newdata = true;
5547                 goto nodata;
5548         } else if (rc == -ENODATA) {
5549                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type)
5550                         type = LNIT_BAD_TYPE;
5551
5552                 count = 1;
5553                 remove = false;
5554                 newdata = true;
5555
5556 nodata:
5557                 if (bk->lb_param & LPF_DRYRUN) {
5558                         if (rc == -ENODATA)
5559                                 ns->ln_flags |= LF_UPGRADE;
5560                         else
5561                                 ns->ln_flags |= LF_INCONSISTENT;
5562                         ns->ln_linkea_repaired++;
5563                         repaired = true;
5564                         log = true;
5565                         goto stop;
5566                 }
5567
5568                 if (!lustre_handle_is_used(&lh)) {
5569                         remove = false;
5570                         newdata = false;
5571                         type = LNIT_NONE;
5572
5573                         goto again;
5574                 }
5575
5576                 LASSERT(handle != NULL);
5577
5578                 if (dir == NULL) {
5579                         dir = lfsck_assistant_object_load(env, lfsck, lso);
5580                         if (IS_ERR(dir)) {
5581                                 rc = PTR_ERR(dir);
5582
5583                                 GOTO(stop, rc == -ENOENT ? 0 : rc);
5584                         }
5585                 }
5586
5587                 rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
5588                 if (rc != 0)
5589                         GOTO(stop, rc);
5590
5591                 bad_linkea = true;
5592                 if (!remove && newdata)
5593                         ns->ln_flags |= LF_UPGRADE;
5594                 else if (remove || !(ns->ln_flags & LF_UPGRADE))
5595                         ns->ln_flags |= LF_INCONSISTENT;
5596
5597                 if (remove) {
5598                         LASSERT(newdata);
5599
5600                         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, handle);
5601                         if (rc != 0 && rc != -ENOENT && rc != -ENODATA)
5602                                 GOTO(stop, rc);
5603                 }
5604
5605                 if (newdata) {
5606                         rc = linkea_data_new(&ldata,
5607                                         &lfsck_env_info(env)->lti_linkea_buf);
5608                         if (rc != 0)
5609                                 GOTO(stop, rc);
5610                 }
5611
5612                 rc = linkea_add_buf(&ldata, cname, pfid);
5613                 if (rc == 0)
5614                         rc = lfsck_links_write(env, obj, &ldata, handle);
5615                 if (rc != 0)
5616                         GOTO(stop, rc);
5617
5618                 count = ldata.ld_leh->leh_reccount;
5619                 if (!S_ISDIR(lfsck_object_type(obj)) ||
5620                     !dt_object_remote(obj)) {
5621                         ns->ln_linkea_repaired++;
5622                         repaired = true;
5623                         log = true;
5624                 }
5625         } else {
5626                 GOTO(stop, rc);
5627         }
5628
5629 stop:
5630         if (dtlocked)
5631                 dt_write_unlock(env, obj);
5632
5633         if (handle != NULL && !IS_ERR(handle))
5634                 dt_trans_stop(env, dev, handle);
5635
5636 out:
5637         lfsck_ibits_unlock(&lh, LCK_EX);
5638
5639         if (!name_is_dot_or_dotdot(lnr->lnr_name, lnr->lnr_namelen) &&
5640             !lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
5641                                              lnr->lnr_name, lnr->lnr_namelen) &&
5642             type != LNIT_BAD_DIRENT) {
5643                 ns->ln_flags |= LF_INCONSISTENT;
5644
5645                 log = false;
5646                 if (dir == NULL) {
5647                         dir = lfsck_assistant_object_load(env, lfsck, lso);
5648                         if (IS_ERR(dir)) {
5649                                 rc = PTR_ERR(dir);
5650
5651                                 GOTO(trace, rc == -ENOENT ? 0 : rc);
5652                         }
5653                 }
5654
5655                 rc = lfsck_namespace_repair_bad_name_hash(env, com, dir,
5656                                                 lnr->lnr_lmv, lnr->lnr_name);
5657                 if (rc == 0)
5658                         bad_hash = true;
5659         }
5660
5661         if (rc >= 0) {
5662                 if (type != LNIT_NONE && dir == NULL) {
5663                         dir = lfsck_assistant_object_load(env, lfsck, lso);
5664                         if (IS_ERR(dir)) {
5665                                 rc = PTR_ERR(dir);
5666
5667                                 GOTO(trace, rc == -ENOENT ? 0 : rc);
5668                         }
5669                 }
5670
5671                 switch (type) {
5672                 case LNIT_BAD_TYPE:
5673                         log = false;
5674                         rc = lfsck_namespace_repair_dirent(env, com, dir,
5675                                         obj, lnr->lnr_name, lnr->lnr_name,
5676                                         lnr->lnr_type, true, false);
5677                         if (rc > 0)
5678                                 repaired = true;
5679                         break;
5680                 case LNIT_BAD_DIRENT:
5681                         log = false;
5682                         /* XXX: This is a bad dirent, we do not know whether
5683                          *      the original name entry reference a regular
5684                          *      file or a directory, then keep the parent's
5685                          *      nlink count unchanged here. */
5686                         rc = lfsck_namespace_repair_dirent(env, com, dir,
5687                                         obj, lnr->lnr_name, lnr->lnr_name,
5688                                         lnr->lnr_type, false, false);
5689                         if (rc > 0)
5690                                 repaired = true;
5691                         break;
5692                 default:
5693                         break;
5694                 }
5695
5696                 if (obj != NULL && count == 1 &&
5697                     S_ISREG(lfsck_object_type(obj)))
5698                         dt_attr_get(env, obj, la);
5699         }
5700
5701 trace:
5702         down_write(&com->lc_sem);
5703         if (rc < 0) {
5704                 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail to handle "
5705                        "the entry: "DFID", parent "DFID", name %.*s: rc = %d\n",
5706                        lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid), PFID(pfid),
5707                        lnr->lnr_namelen, lnr->lnr_name, rc);
5708
5709                 lfsck_namespace_record_failure(env, lfsck, ns);
5710                 if ((rc == -ENOTCONN || rc == -ESHUTDOWN || rc == -EREMCHG ||
5711                      rc == -ETIMEDOUT || rc == -EHOSTDOWN ||
5712                      rc == -EHOSTUNREACH || rc == -EINPROGRESS) &&
5713                     dev != NULL && dev != lfsck->li_bottom)
5714                         lfsck_lad_set_bitmap(env, com, idx);
5715
5716                 if (!(bk->lb_param & LPF_FAILOUT))
5717                         rc = 0;
5718         } else {
5719                 if (repaired) {
5720                         ns->ln_items_repaired++;
5721                         if (log)
5722                                 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant "
5723                                        "repaired the entry: "DFID", parent "DFID
5724                                        ", name %.*s, type %d\n",
5725                                        lfsck_lfsck2name(lfsck),
5726                                        PFID(&lnr->lnr_fid), PFID(pfid),
5727                                        lnr->lnr_namelen, lnr->lnr_name, type);
5728
5729                         switch (type) {
5730                         case LNIT_DANGLING:
5731                                 ns->ln_dangling_repaired++;
5732                                 break;
5733                         case LNIT_BAD_TYPE:
5734                                 ns->ln_bad_type_repaired++;
5735                                 break;
5736                         case LNIT_BAD_DIRENT:
5737                                 ns->ln_dirent_repaired++;
5738                                 break;
5739                         default:
5740                                 break;
5741                         }
5742
5743                         if (bk->lb_param & LPF_DRYRUN &&
5744                             lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
5745                                 lfsck_pos_fill(env, lfsck,
5746                                                &ns->ln_pos_first_inconsistent,
5747                                                false);
5748                 }
5749
5750                 if (bad_hash) {
5751                         ns->ln_name_hash_repaired++;
5752
5753                         /* Not count repeatedly. */
5754                         if (!repaired) {
5755                                 ns->ln_items_repaired++;
5756                                 if (log)
5757                                         CDEBUG(D_LFSCK, "%s: namespace LFSCK "
5758                                                "assistant repaired the entry: "
5759                                                DFID", parent "DFID
5760                                                ", name %.*s\n",
5761                                                lfsck_lfsck2name(lfsck),
5762                                                PFID(&lnr->lnr_fid), PFID(pfid),
5763                                                lnr->lnr_namelen, lnr->lnr_name);
5764                         }
5765
5766                         if (bk->lb_param & LPF_DRYRUN &&
5767                             lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
5768                                 lfsck_pos_fill(env, lfsck,
5769                                                &ns->ln_pos_first_inconsistent,
5770                                                false);
5771                 }
5772
5773                 rc = 0;
5774         }
5775
5776         if (count > 1 || la->la_nlink > 1)
5777                 ns->ln_mul_linked_checked++;
5778
5779         up_write(&com->lc_sem);
5780
5781         if (obj != NULL && !IS_ERR(obj))
5782                 lfsck_object_put(env, obj);
5783
5784         if (dir != NULL && !IS_ERR(dir))
5785                 lfsck_object_put(env, dir);
5786
5787         lad->lad_advance_lock = bad_linkea;
5788
5789         return rc;
5790 }
5791
5792 /**
5793  * Handle one orphan under the backend /lost+found directory
5794  *
5795  * Insert the orphan FID into the namespace LFSCK trace file for further
5796  * processing (via the subsequent namespace LFSCK second-stage scanning).
5797  * At the same time, remove the orphan name entry from backend /lost+found
5798  * directory. There is an interval between the orphan name entry removed
5799  * from the backend /lost+found directory and the orphan FID in the LFSCK
5800  * trace file handled. In such interval, the LFSCK can be reset, then
5801  * all the FIDs recorded in the namespace LFSCK trace file will be dropped.
5802  * To guarantee that the orphans can be found when LFSCK run next time
5803  * without e2fsck again, when remove the orphan name entry, the LFSCK
5804  * will set the orphan's ctime attribute as 1. Since normal applications
5805  * cannot change the object's ctime attribute as 1. Then when LFSCK run
5806  * next time, it can record the object (that ctime is 1) in the namespace
5807  * LFSCK trace file during the first-stage scanning.
5808  *
5809  * \param[in] env       pointer to the thread context
5810  * \param[in] com       pointer to the lfsck component
5811  * \param[in] parent    pointer to the object for the backend /lost+found
5812  * \param[in] ent       pointer to the name entry for the target under the
5813  *                      backend /lost+found
5814  *
5815  * \retval              positive for repaired
5816  * \retval              0 if needs to repair nothing
5817  * \retval              negative error number on failure
5818  */
5819 static int lfsck_namespace_scan_local_lpf_one(const struct lu_env *env,
5820                                               struct lfsck_component *com,
5821                                               struct dt_object *parent,
5822                                               struct lu_dirent *ent)
5823 {
5824         struct lfsck_thread_info        *info   = lfsck_env_info(env);
5825         struct lu_fid                   *key    = &info->lti_fid;
5826         struct lu_attr                  *la     = &info->lti_la;
5827         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5828         struct dt_object                *obj;
5829         struct dt_device                *dev    = lfsck->li_bottom;
5830         struct dt_object                *child  = NULL;
5831         struct thandle                  *th     = NULL;
5832         int                              idx;
5833         int                              rc     = 0;
5834         __u8                             flags  = 0;
5835         bool                             exist  = false;
5836         ENTRY;
5837
5838         child = lfsck_object_find_by_dev(env, dev, &ent->lde_fid);
5839         if (IS_ERR(child))
5840                 RETURN(PTR_ERR(child));
5841
5842         LASSERT(dt_object_exists(child));
5843         LASSERT(!dt_object_remote(child));
5844
5845         idx = lfsck_sub_trace_file_fid2idx(&ent->lde_fid);
5846         obj = com->lc_sub_trace_objs[idx].lsto_obj;
5847         fid_cpu_to_be(key, &ent->lde_fid);
5848         rc = dt_lookup(env, obj, (struct dt_rec *)&flags,
5849                        (const struct dt_key *)key);
5850         if (rc == 0) {
5851                 exist = true;
5852                 flags |= LNTF_CHECK_ORPHAN;
5853         } else if (rc == -ENOENT) {
5854                 flags = LNTF_CHECK_ORPHAN;
5855         } else {
5856                 GOTO(out, rc);
5857         }
5858
5859         th = dt_trans_create(env, dev);
5860         if (IS_ERR(th))
5861                 GOTO(out, rc = PTR_ERR(th));
5862
5863         /* a1. remove name entry from backend /lost+found */
5864         rc = dt_declare_delete(env, parent,
5865                                (const struct dt_key *)ent->lde_name, th);
5866         if (rc != 0)
5867                 GOTO(stop, rc);
5868
5869         if (S_ISDIR(lfsck_object_type(child))) {
5870                 /* a2. decrease parent's nlink */
5871                 rc = dt_declare_ref_del(env, parent, th);
5872                 if (rc != 0)
5873                         GOTO(stop, rc);
5874         }
5875
5876         if (exist) {
5877                 /* a3. remove child's FID from the LFSCK trace file. */
5878                 rc = dt_declare_delete(env, obj,
5879                                        (const struct dt_key *)key, th);
5880                 if (rc != 0)
5881                         GOTO(stop, rc);
5882         } else {
5883                 /* a4. set child's ctime as 1 */
5884                 memset(la, 0, sizeof(*la));
5885                 la->la_ctime = 1;
5886                 la->la_valid = LA_CTIME;
5887                 rc = dt_declare_attr_set(env, child, la, th);
5888                 if (rc != 0)
5889                         GOTO(stop, rc);
5890         }
5891
5892         /* a5. insert child's FID into the LFSCK trace file. */
5893         rc = dt_declare_insert(env, obj, (const struct dt_rec *)&flags,
5894                                (const struct dt_key *)key, th);
5895         if (rc != 0)
5896                 GOTO(stop, rc);
5897
5898         rc = dt_trans_start_local(env, dev, th);
5899         if (rc != 0)
5900                 GOTO(stop, rc);
5901
5902         /* b1. remove name entry from backend /lost+found */
5903         rc = dt_delete(env, parent, (const struct dt_key *)ent->lde_name, th);
5904         if (rc != 0)
5905                 GOTO(stop, rc);
5906
5907         if (S_ISDIR(lfsck_object_type(child))) {
5908                 /* b2. decrease parent's nlink */
5909                 dt_write_lock(env, parent, 0);
5910                 rc = dt_ref_del(env, parent, th);
5911                 dt_write_unlock(env, parent);
5912                 if (rc != 0)
5913                         GOTO(stop, rc);
5914         }
5915
5916         if (exist) {
5917                 /* a3. remove child's FID from the LFSCK trace file. */
5918                 rc = dt_delete(env, obj, (const struct dt_key *)key, th);
5919                 if (rc != 0)
5920                         GOTO(stop, rc);
5921         } else {
5922                 /* b4. set child's ctime as 1 */
5923                 rc = dt_attr_set(env, child, la, th);
5924                 if (rc != 0)
5925                         GOTO(stop, rc);
5926         }
5927
5928         /* b5. insert child's FID into the LFSCK trace file. */
5929         rc = dt_insert(env, obj, (const struct dt_rec *)&flags,
5930                        (const struct dt_key *)key, th, 1);
5931
5932         GOTO(stop, rc = (rc == 0 ? 1 : rc));
5933
5934 stop:
5935         dt_trans_stop(env, dev, th);
5936
5937 out:
5938         lfsck_object_put(env, child);
5939
5940         return rc;
5941 }
5942
5943 /**
5944  * Handle orphans under the backend /lost+found directory
5945  *
5946  * Some backend checker, such as e2fsck for ldiskfs may find some orphans
5947  * and put them under the backend /lost+found directory that is invisible
5948  * to client. The LFSCK will scan such directory, for the original client
5949  * visible orphans, add their fids into the namespace LFSCK trace file,
5950  * then the subsenquent namespace LFSCK second-stage scanning can handle
5951  * them as other objects to be double scanned: either move back to normal
5952  * namespace, or to the global visible orphan directory:
5953  * /ROOT/.lustre/lost+found/MDTxxxx/
5954  *
5955  * \param[in] env       pointer to the thread context
5956  * \param[in] com       pointer to the lfsck component
5957  */
5958 static void lfsck_namespace_scan_local_lpf(const struct lu_env *env,
5959                                            struct lfsck_component *com)
5960 {
5961         struct lfsck_thread_info        *info   = lfsck_env_info(env);
5962         struct lu_dirent                *ent    =
5963                                         (struct lu_dirent *)info->lti_key;
5964         struct lu_seq_range             *range  = &info->lti_range;
5965         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5966         struct ptlrpc_thread            *thread = &lfsck->li_thread;
5967         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
5968         struct lfsck_namespace          *ns     = com->lc_file_ram;
5969         struct dt_object                *parent;
5970         const struct dt_it_ops          *iops;
5971         struct dt_it                    *di;
5972         struct seq_server_site          *ss     = lfsck_dev_site(lfsck);
5973         __u64                            cookie;
5974         __u32                            idx    = lfsck_dev_idx(lfsck);
5975         int                              rc     = 0;
5976         __u16                            type;
5977         ENTRY;
5978
5979         parent = lfsck_object_find_by_dev(env, lfsck->li_bottom,
5980                                           &LU_BACKEND_LPF_FID);
5981         if (IS_ERR(parent)) {
5982                 CERROR("%s: fail to find backend /lost+found: rc = %ld\n",
5983                        lfsck_lfsck2name(lfsck), PTR_ERR(parent));
5984                 RETURN_EXIT;
5985         }
5986
5987         /* It is normal that the /lost+found does not exist for ZFS backend. */
5988         if (!dt_object_exists(parent))
5989                 GOTO(out, rc = 0);
5990
5991         if (unlikely(!dt_try_as_dir(env, parent)))
5992                 GOTO(out, rc = -ENOTDIR);
5993
5994         CDEBUG(D_LFSCK, "%s: start to scan backend /lost+found\n",
5995                lfsck_lfsck2name(lfsck));
5996
5997         com->lc_new_scanned = 0;
5998         iops = &parent->do_index_ops->dio_it;
5999         di = iops->init(env, parent, LUDA_64BITHASH | LUDA_TYPE);
6000         if (IS_ERR(di))
6001                 GOTO(out, rc = PTR_ERR(di));
6002
6003         rc = iops->load(env, di, 0);
6004         if (rc == 0)
6005                 rc = iops->next(env, di);
6006         else if (rc > 0)
6007                 rc = 0;
6008
6009         while (rc == 0) {
6010                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY3, cfs_fail_val) &&
6011                     unlikely(!thread_is_running(thread)))
6012                         break;
6013
6014                 rc = iops->rec(env, di, (struct dt_rec *)ent,
6015                                LUDA_64BITHASH | LUDA_TYPE);
6016                 if (rc == 0)
6017                         rc = lfsck_unpack_ent(ent, &cookie, &type);
6018
6019                 if (unlikely(rc != 0)) {
6020                         CDEBUG(D_LFSCK, "%s: fail to iterate backend "
6021                                "/lost+found: rc = %d\n",
6022                                lfsck_lfsck2name(lfsck), rc);
6023
6024                         goto skip;
6025                 }
6026
6027                 /* skip dot and dotdot entries */
6028                 if (name_is_dot_or_dotdot(ent->lde_name, ent->lde_namelen))
6029                         goto next;
6030
6031                 if (!fid_seq_in_fldb(fid_seq(&ent->lde_fid)))
6032                         goto skip;
6033
6034                 if (fid_is_norm(&ent->lde_fid)) {
6035                         fld_range_set_mdt(range);
6036                         rc = fld_local_lookup(env, ss->ss_server_fld,
6037                                               fid_seq(&ent->lde_fid), range);
6038                         if (rc != 0)
6039                                 goto skip;
6040                 } else if (idx != 0) {
6041                         /* If the returned FID is IGIF, then there are three
6042                          * possible cases:
6043                          *
6044                          * 1) The object is upgraded from old Lustre-1.8 with
6045                          *    IGIF assigned to such object.
6046                          * 2) The object is a backend local object and is
6047                          *    invisible to client.
6048                          * 3) The object lost its LMV EA, and since there is
6049                          *    no FID-in-dirent for the orphan in the backend
6050                          *    /lost+found directory, then the low layer will
6051                          *    return IGIF for such object.
6052                          *
6053                          * For MDTx (x != 0), it is either case 2) or case 3),
6054                          * but from the LFSCK view, they are indistinguishable.
6055                          * To be safe, the LFSCK will keep it there and report
6056                          * some message, then the adminstrator can handle that
6057                          * furtherly.
6058                          *
6059                          * For MDT0, it is more possible the case 1). The LFSCK
6060                          * will handle the orphan as an upgraded object. */
6061                         CDEBUG(D_LFSCK, "%s: the orphan %.*s with IGIF "DFID
6062                                "in the backend /lost+found on the MDT %04x, "
6063                                "to be safe, skip it.\n",
6064                                lfsck_lfsck2name(lfsck), ent->lde_namelen,
6065                                ent->lde_name, PFID(&ent->lde_fid), idx);
6066                         goto skip;
6067                 }
6068
6069                 rc = lfsck_namespace_scan_local_lpf_one(env, com, parent, ent);
6070
6071 skip:
6072                 down_write(&com->lc_sem);
6073                 com->lc_new_scanned++;
6074                 ns->ln_local_lpf_scanned++;
6075                 if (rc > 0)
6076                         ns->ln_local_lpf_moved++;
6077                 else if (rc == 0)
6078                         ns->ln_local_lpf_skipped++;
6079                 else
6080                         ns->ln_local_lpf_failed++;
6081                 up_write(&com->lc_sem);
6082
6083                 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
6084                         break;
6085
6086 next:
6087                 lfsck_control_speed_by_self(com);
6088                 if (unlikely(!thread_is_running(thread))) {
6089                         rc = 0;
6090                         break;
6091                 }
6092
6093                 rc = iops->next(env, di);
6094         }
6095
6096         iops->put(env, di);
6097         iops->fini(env, di);
6098
6099         EXIT;
6100
6101 out:
6102         CDEBUG(D_LFSCK, "%s: stop to scan backend /lost+found: rc = %d\n",
6103                lfsck_lfsck2name(lfsck), rc);
6104
6105         lfsck_object_put(env, parent);
6106 }
6107
6108 /**
6109  * Rescan the striped directory after the master LMV EA reset.
6110  *
6111  * Sometimes, the master LMV EA of the striped directory maybe lost, so when
6112  * the namespace LFSCK engine scan the striped directory for the first time,
6113  * it will be regarded as a normal directory. As the LFSCK processing, some
6114  * other LFSCK instance on other MDT will find the shard of this striped dir,
6115  * and find that the master MDT-object of the striped directory lost its LMV
6116  * EA, then such remote LFSCK instance will regenerate the master LMV EA and
6117  * notify the LFSCK instance on this MDT to rescan the striped directory.
6118  *
6119  * \param[in] env       pointer to the thread context
6120  * \param[in] com       pointer to the lfsck component
6121  * \param[in] llu       the lfsck_lmv_unit that contains the striped directory
6122  *                      to be rescanned.
6123  *
6124  * \retval              positive number for success
6125  * \retval              0 for LFSCK stopped/paused
6126  * \retval              negative error number on failure
6127  */
6128 static int lfsck_namespace_rescan_striped_dir(const struct lu_env *env,
6129                                               struct lfsck_component *com,
6130                                               struct lfsck_lmv_unit *llu)
6131 {
6132         struct lfsck_thread_info        *info   = lfsck_env_info(env);
6133         struct lfsck_instance           *lfsck  = com->lc_lfsck;
6134         struct lfsck_assistant_data     *lad    = com->lc_data;
6135         struct dt_object                *dir;
6136         const struct dt_it_ops          *iops;
6137         struct dt_it                    *di;
6138         struct lu_dirent                *ent    =
6139                         (struct lu_dirent *)info->lti_key;
6140         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
6141         struct ptlrpc_thread            *thread = &lfsck->li_thread;
6142         struct lfsck_assistant_object   *lso    = NULL;
6143         struct lfsck_namespace_req      *lnr;
6144         struct lfsck_assistant_req      *lar;
6145         int                              rc;
6146         __u16                            type;
6147         ENTRY;
6148
6149         LASSERT(list_empty(&lad->lad_req_list));
6150
6151         lfsck->li_lmv = &llu->llu_lmv;
6152         lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
6153         rc = lfsck_open_dir(env, lfsck, 0);
6154         if (rc != 0)
6155                 RETURN(rc);
6156
6157         dir = lfsck->li_obj_dir;
6158         di = lfsck->li_di_dir;
6159         iops = &dir->do_index_ops->dio_it;
6160         do {
6161                 rc = iops->rec(env, di, (struct dt_rec *)ent,
6162                                lfsck->li_args_dir);
6163                 if (rc == 0)
6164                         rc = lfsck_unpack_ent(ent, &lfsck->li_cookie_dir,
6165                                               &type);
6166
6167                 if (rc != 0) {
6168                         if (bk->lb_param & LPF_FAILOUT)
6169                                 GOTO(out, rc);
6170
6171                         goto next;
6172                 }
6173
6174                 if (name_is_dot_or_dotdot(ent->lde_name, ent->lde_namelen))
6175                         goto next;
6176
6177                 if (lso == NULL) {
6178                         lso = lfsck_assistant_object_init(env,
6179                                 lfsck_dto2fid(dir), NULL,
6180                                 lfsck->li_pos_current.lp_oit_cookie, true);
6181                         if (IS_ERR(lso)) {
6182                                 if (bk->lb_param & LPF_FAILOUT)
6183                                         GOTO(out, rc = PTR_ERR(lso));
6184
6185                                 lso = NULL;
6186                                 goto next;
6187                         }
6188                 }
6189
6190                 lnr = lfsck_namespace_assistant_req_init(lfsck, lso, ent, type);
6191                 if (IS_ERR(lnr)) {
6192                         if (bk->lb_param & LPF_FAILOUT)
6193                                 GOTO(out, rc = PTR_ERR(lnr));
6194
6195                         goto next;
6196                 }
6197
6198                 lar = &lnr->lnr_lar;
6199                 rc = lfsck_namespace_assistant_handler_p1(env, com, lar);
6200                 lfsck_namespace_assistant_req_fini(env, lar);
6201                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
6202                         GOTO(out, rc);
6203
6204                 if (unlikely(!thread_is_running(thread)))
6205                         GOTO(out, rc = 0);
6206
6207 next:
6208                 rc = iops->next(env, di);
6209         } while (rc == 0);
6210
6211 out:
6212         if (lso != NULL && !IS_ERR(lso))
6213                 lfsck_assistant_object_put(env, lso);
6214
6215         lfsck_close_dir(env, lfsck, rc);
6216         if (rc <= 0)
6217                 RETURN(rc);
6218
6219         /* The close_dir() may insert a dummy lnr in the lad->lad_req_list. */
6220         if (list_empty(&lad->lad_req_list))
6221                 RETURN(1);
6222
6223         spin_lock(&lad->lad_lock);
6224         lar = list_entry(lad->lad_req_list.next, struct lfsck_assistant_req,
6225                           lar_list);
6226         list_del_init(&lar->lar_list);
6227         spin_unlock(&lad->lad_lock);
6228
6229         rc = lfsck_namespace_assistant_handler_p1(env, com, lar);
6230         lfsck_namespace_assistant_req_fini(env, lar);
6231
6232         RETURN(rc == 0 ? 1 : rc);
6233 }
6234
6235 static int
6236 lfsck_namespace_double_scan_one_trace_file(const struct lu_env *env,
6237                                            struct lfsck_component *com,
6238                                            struct dt_object *obj, bool first)
6239 {
6240         struct lfsck_instance   *lfsck  = com->lc_lfsck;
6241         struct ptlrpc_thread    *thread = &lfsck->li_thread;
6242         struct lfsck_bookmark   *bk     = &lfsck->li_bookmark_ram;
6243         struct lfsck_namespace  *ns     = com->lc_file_ram;
6244         const struct dt_it_ops  *iops   = &obj->do_index_ops->dio_it;
6245         struct dt_object        *target;
6246         struct dt_it            *di;
6247         struct dt_key           *key;
6248         struct lu_fid            fid;
6249         int                      rc;
6250         __u8                     flags  = 0;
6251         ENTRY;
6252
6253         di = iops->init(env, obj, 0);
6254         if (IS_ERR(di))
6255                 RETURN(PTR_ERR(di));
6256
6257         if (first)
6258                 fid_cpu_to_be(&fid, &ns->ln_fid_latest_scanned_phase2);
6259         else
6260                 fid_zero(&fid);
6261         rc = iops->get(env, di, (const struct dt_key *)&fid);
6262         if (rc < 0)
6263                 GOTO(fini, rc);
6264
6265         if (first) {
6266                 /* The start one either has been processed or does not exist,
6267                  * skip it. */
6268                 rc = iops->next(env, di);
6269                 if (rc != 0)
6270                         GOTO(put, rc);
6271         }
6272
6273         do {
6274                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY3, cfs_fail_val) &&
6275                     unlikely(!thread_is_running(thread)))
6276                         GOTO(put, rc = 0);
6277
6278                 key = iops->key(env, di);
6279                 if (IS_ERR(key)) {
6280                         rc = PTR_ERR(key);
6281                         if (rc == -ENOENT)
6282                                 GOTO(put, rc = 1);
6283
6284                         goto checkpoint;
6285                 }
6286
6287                 fid_be_to_cpu(&fid, (const struct lu_fid *)key);
6288                 if (!fid_is_sane(&fid)) {
6289                         rc = 0;
6290                         goto checkpoint;
6291                 }
6292
6293                 target = lfsck_object_find_bottom(env, lfsck, &fid);
6294                 if (IS_ERR(target)) {
6295                         rc = PTR_ERR(target);
6296                         goto checkpoint;
6297                 }
6298
6299                 if (dt_object_exists(target)) {
6300                         rc = iops->rec(env, di, (struct dt_rec *)&flags, 0);
6301                         if (rc == 0) {
6302                                 rc = lfsck_namespace_double_scan_one(env, com,
6303                                                                 target, flags);
6304                                 if (rc == -ENOENT)
6305                                         rc = 0;
6306                         }
6307                 }
6308
6309                 lfsck_object_put(env, target);
6310
6311 checkpoint:
6312                 down_write(&com->lc_sem);
6313                 com->lc_new_checked++;
6314                 com->lc_new_scanned++;
6315                 if (rc >= 0)
6316                         ns->ln_fid_latest_scanned_phase2 = fid;
6317
6318                 if (rc > 0)
6319                         ns->ln_objs_repaired_phase2++;
6320                 else if (rc < 0)
6321                         ns->ln_objs_failed_phase2++;
6322                 up_write(&com->lc_sem);
6323
6324                 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
6325                         GOTO(put, rc);
6326
6327                 if (unlikely(com->lc_time_next_checkpoint <=
6328                              ktime_get_seconds()) &&
6329                     com->lc_new_checked != 0) {
6330                         down_write(&com->lc_sem);
6331                         ns->ln_run_time_phase2 += ktime_get_seconds() -
6332                                                   com->lc_time_last_checkpoint;
6333                         ns->ln_time_last_checkpoint = ktime_get_real_seconds();
6334                         ns->ln_objs_checked_phase2 += com->lc_new_checked;
6335                         com->lc_new_checked = 0;
6336                         lfsck_namespace_store(env, com);
6337                         up_write(&com->lc_sem);
6338
6339                         com->lc_time_last_checkpoint = ktime_get_seconds();
6340                         com->lc_time_next_checkpoint =
6341                                 com->lc_time_last_checkpoint +
6342                                 LFSCK_CHECKPOINT_INTERVAL;
6343                 }
6344
6345                 lfsck_control_speed_by_self(com);
6346                 if (unlikely(!thread_is_running(thread)))
6347                         GOTO(put, rc = 0);
6348
6349                 rc = iops->next(env, di);
6350         } while (rc == 0);
6351
6352         GOTO(put, rc);
6353
6354 put:
6355         iops->put(env, di);
6356
6357 fini:
6358         iops->fini(env, di);
6359
6360         return rc;
6361 }
6362
6363 static int lfsck_namespace_assistant_handler_p2(const struct lu_env *env,
6364                                                 struct lfsck_component *com)
6365 {
6366         struct lfsck_instance   *lfsck  = com->lc_lfsck;
6367         struct lfsck_namespace  *ns     = com->lc_file_ram;
6368         int                      rc;
6369         int                      i;
6370         ENTRY;
6371
6372         while (!list_empty(&lfsck->li_list_lmv)) {
6373                 struct lfsck_lmv_unit *llu;
6374
6375                 spin_lock(&lfsck->li_lock);
6376                 llu = list_entry(lfsck->li_list_lmv.next,
6377                                  struct lfsck_lmv_unit, llu_link);
6378                 list_del_init(&llu->llu_link);
6379                 spin_unlock(&lfsck->li_lock);
6380
6381                 rc = lfsck_namespace_rescan_striped_dir(env, com, llu);
6382                 if (rc <= 0)
6383                         RETURN(rc);
6384         }
6385
6386         CDEBUG(D_LFSCK, "%s: namespace LFSCK phase2 scan start\n",
6387                lfsck_lfsck2name(lfsck));
6388
6389         lfsck_namespace_scan_local_lpf(env, com);
6390
6391         com->lc_new_checked = 0;
6392         com->lc_new_scanned = 0;
6393         com->lc_time_last_checkpoint = ktime_get_seconds();
6394         com->lc_time_next_checkpoint = com->lc_time_last_checkpoint +
6395                                        LFSCK_CHECKPOINT_INTERVAL;
6396
6397         i = lfsck_sub_trace_file_fid2idx(&ns->ln_fid_latest_scanned_phase2);
6398         rc = lfsck_namespace_double_scan_one_trace_file(env, com,
6399                                 com->lc_sub_trace_objs[i].lsto_obj, true);
6400         while (rc > 0 && ++i < LFSCK_STF_COUNT)
6401                 rc = lfsck_namespace_double_scan_one_trace_file(env, com,
6402                                 com->lc_sub_trace_objs[i].lsto_obj, false);
6403
6404         CDEBUG(D_LFSCK, "%s: namespace LFSCK phase2 scan stop at the No. %d "
6405                "trace file: rc = %d\n", lfsck_lfsck2name(lfsck), i, rc);
6406
6407         RETURN(rc);
6408 }
6409
6410 static void lfsck_namespace_assistant_fill_pos(const struct lu_env *env,
6411                                                struct lfsck_component *com,
6412                                                struct lfsck_position *pos)
6413 {
6414         struct lfsck_assistant_data     *lad = com->lc_data;
6415         struct lfsck_namespace_req      *lnr;
6416
6417         if (((struct lfsck_namespace *)(com->lc_file_ram))->ln_status !=
6418             LS_SCANNING_PHASE1)
6419                 return;
6420
6421         if (list_empty(&lad->lad_req_list))
6422                 return;
6423
6424         lnr = list_entry(lad->lad_req_list.next,
6425                          struct lfsck_namespace_req,
6426                          lnr_lar.lar_list);
6427         pos->lp_oit_cookie = lnr->lnr_lar.lar_parent->lso_oit_cookie;
6428         pos->lp_dir_cookie = lnr->lnr_dir_cookie - 1;
6429         pos->lp_dir_parent = lnr->lnr_lar.lar_parent->lso_fid;
6430 }
6431
6432 static int lfsck_namespace_double_scan_result(const struct lu_env *env,
6433                                               struct lfsck_component *com,
6434                                               int rc)
6435 {
6436         struct lfsck_instance   *lfsck  = com->lc_lfsck;
6437         struct lfsck_namespace  *ns     = com->lc_file_ram;
6438
6439         down_write(&com->lc_sem);
6440         ns->ln_run_time_phase2 += ktime_get_seconds() -
6441                                   com->lc_time_last_checkpoint;
6442         ns->ln_time_last_checkpoint = ktime_get_real_seconds();
6443         ns->ln_objs_checked_phase2 += com->lc_new_checked;
6444         com->lc_new_checked = 0;
6445
6446         if (rc > 0) {
6447                 if (ns->ln_flags & LF_INCOMPLETE)
6448                         ns->ln_status = LS_PARTIAL;
6449                 else
6450                         ns->ln_status = LS_COMPLETED;
6451                 ns->ln_flags &= ~LF_SCANNED_ONCE;
6452                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN))
6453                         ns->ln_flags &= ~LF_INCONSISTENT;
6454                 ns->ln_time_last_complete = ns->ln_time_last_checkpoint;
6455                 ns->ln_success_count++;
6456         } else if (rc == 0) {
6457                 if (lfsck->li_status != 0)
6458                         ns->ln_status = lfsck->li_status;
6459                 else
6460                         ns->ln_status = LS_STOPPED;
6461         } else {
6462                 ns->ln_status = LS_FAILED;
6463         }
6464
6465         rc = lfsck_namespace_store(env, com);
6466         up_write(&com->lc_sem);
6467
6468         return rc;
6469 }
6470
6471 static int
6472 lfsck_namespace_assistant_sync_failures_interpret(const struct lu_env *env,
6473                                                   struct ptlrpc_request *req,
6474                                                   void *args, int rc)
6475 {
6476         if (rc == 0) {
6477                 struct lfsck_async_interpret_args *laia = args;
6478                 struct lfsck_tgt_desc             *ltd  = laia->laia_ltd;
6479
6480                 ltd->ltd_synced_failures = 1;
6481         }
6482
6483         return 0;
6484 }
6485
6486 /**
6487  * Notify remote LFSCK instances about former failures.
6488  *
6489  * The local LFSCK instance has recorded which MDTs have ever failed to respond
6490  * some LFSCK verification requests (maybe because of network issues or the MDT
6491  * itself trouble). During the respond gap the MDT may missed some name entries
6492  * verification, then the MDT cannot know whether related MDT-objects have been
6493  * referenced by related name entries or not, then in the second-stage scanning,
6494  * these MDT-objects will be regarded as orphan, if the MDT-object contains bad
6495  * linkEA for back reference, then it will misguide the LFSCK to generate wrong
6496  * name entry for repairing the orphan.
6497  *
6498  * To avoid above trouble, when layout LFSCK finishes the first-stage scanning,
6499  * it will scan the bitmap for the ever failed MDTs, and notify them that they
6500  * have ever missed some name entries verification and should skip the handling
6501  * for orphan MDT-objects.
6502  *
6503  * \param[in] env       pointer to the thread context
6504  * \param[in] com       pointer to the lfsck component
6505  * \param[in] lr        pointer to the lfsck request
6506  */
6507 static void lfsck_namespace_assistant_sync_failures(const struct lu_env *env,
6508                                                     struct lfsck_component *com,
6509                                                     struct lfsck_request *lr)
6510 {
6511         struct lfsck_async_interpret_args *laia  =
6512                                 &lfsck_env_info(env)->lti_laia2;
6513         struct lfsck_assistant_data       *lad   = com->lc_data;
6514         struct lfsck_namespace            *ns    = com->lc_file_ram;
6515         struct lfsck_instance             *lfsck = com->lc_lfsck;
6516         struct lfsck_tgt_descs            *ltds  = &lfsck->li_mdt_descs;
6517         struct lfsck_tgt_desc             *ltd;
6518         struct ptlrpc_request_set         *set;
6519         __u32                              idx;
6520         int                                rc    = 0;
6521         ENTRY;
6522
6523         if (!lad->lad_incomplete)
6524                 RETURN_EXIT;
6525
6526         set = ptlrpc_prep_set();
6527         if (set == NULL)
6528                 GOTO(out, rc = -ENOMEM);
6529
6530         lr->lr_flags2 = ns->ln_flags | LF_INCOMPLETE;
6531         memset(laia, 0, sizeof(*laia));
6532         lad->lad_touch_gen++;
6533
6534         down_read(&ltds->ltd_rw_sem);
6535         cfs_foreach_bit(lad->lad_bitmap, idx) {
6536                 ltd = lfsck_ltd2tgt(ltds, idx);
6537                 if (unlikely(!ltd))
6538                         continue;
6539
6540                 laia->laia_ltd = ltd;
6541                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
6542                         lfsck_namespace_assistant_sync_failures_interpret,
6543                         laia, LFSCK_NOTIFY);
6544                 if (rc != 0)
6545                         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail "
6546                                "to sync failure with MDT %x: rc = %d\n",
6547                                lfsck_lfsck2name(lfsck), ltd->ltd_index, rc);
6548         }
6549         up_read(&ltds->ltd_rw_sem);
6550
6551         rc = ptlrpc_set_wait(set);
6552         ptlrpc_set_destroy(set);
6553
6554         GOTO(out, rc);
6555
6556 out:
6557         if (rc != 0)
6558                 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail "
6559                        "to sync failure with MDTs, and related MDTs "
6560                        "may handle orphan improperly: rc = %d\n",
6561                        lfsck_lfsck2name(lfsck), rc);
6562
6563         EXIT;
6564 }
6565
6566 struct lfsck_assistant_operations lfsck_namespace_assistant_ops = {
6567         .la_handler_p1          = lfsck_namespace_assistant_handler_p1,
6568         .la_handler_p2          = lfsck_namespace_assistant_handler_p2,
6569         .la_fill_pos            = lfsck_namespace_assistant_fill_pos,
6570         .la_double_scan_result  = lfsck_namespace_double_scan_result,
6571         .la_req_fini            = lfsck_namespace_assistant_req_fini,
6572         .la_sync_failures       = lfsck_namespace_assistant_sync_failures,
6573 };
6574
6575 /**
6576  * Verify the specified linkEA entry for the given directory object.
6577  * If the object has no such linkEA entry or it has more other linkEA
6578  * entries, then re-generate the linkEA with the given information.
6579  *
6580  * \param[in] env       pointer to the thread context
6581  * \param[in] obj       pointer to the dt_object to be handled
6582  * \param[in] cname     the name for the child in the parent directory
6583  * \param[in] pfid      the parent directory's FID for the linkEA
6584  *
6585  * \retval              0 for success
6586  * \retval              negative error number on failure
6587  */
6588 int lfsck_verify_linkea(const struct lu_env *env, struct dt_object *obj,
6589                         const struct lu_name *cname, const struct lu_fid *pfid)
6590 {
6591         struct dt_device        *dev    = lfsck_obj2dev(obj);
6592         struct linkea_data       ldata  = { NULL };
6593         struct lu_buf            linkea_buf;
6594         struct thandle          *th;
6595         int                      rc;
6596         int                      fl     = LU_XATTR_CREATE;
6597         bool                     dirty  = false;
6598         ENTRY;
6599
6600         LASSERT(S_ISDIR(lfsck_object_type(obj)));
6601
6602         rc = lfsck_links_read_with_rec(env, obj, &ldata);
6603         if (rc == -ENODATA) {
6604                 dirty = true;
6605         } else if (rc == 0) {
6606                 fl = LU_XATTR_REPLACE;
6607                 if (ldata.ld_leh->leh_reccount != 1) {
6608                         dirty = true;
6609                 } else {
6610                         rc = linkea_links_find(&ldata, cname, pfid);
6611                         if (rc != 0)
6612                                 dirty = true;
6613                 }
6614         }
6615
6616         if (!dirty)
6617                 RETURN(rc);
6618
6619         rc = linkea_links_new(&ldata, &lfsck_env_info(env)->lti_linkea_buf,
6620                               cname, pfid);
6621         if (rc != 0)
6622                 RETURN(rc);
6623
6624         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
6625                        ldata.ld_leh->leh_len);
6626         th = dt_trans_create(env, dev);
6627         if (IS_ERR(th))
6628                 RETURN(PTR_ERR(th));
6629
6630         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
6631                                   XATTR_NAME_LINK, fl, th);
6632         if (rc != 0)
6633                 GOTO(stop, rc);
6634
6635         rc = dt_trans_start_local(env, dev, th);
6636         if (rc != 0)
6637                 GOTO(stop, rc);
6638
6639         dt_write_lock(env, obj, 0);
6640         rc = dt_xattr_set(env, obj, &linkea_buf,
6641                           XATTR_NAME_LINK, fl, th);
6642         dt_write_unlock(env, obj);
6643
6644         GOTO(stop, rc);
6645
6646 stop:
6647         dt_trans_stop(env, dev, th);
6648         return rc;
6649 }
6650
6651 /**
6652  * Get the name and parent directory's FID from the first linkEA entry.
6653  *
6654  * \param[in] env       pointer to the thread context
6655  * \param[in] obj       pointer to the object which get linkEA from
6656  * \param[out] name     pointer to the buffer to hold the name
6657  *                      in the first linkEA entry
6658  * \param[out] pfid     pointer to the buffer to hold the parent
6659  *                      directory's FID in the first linkEA entry
6660  *
6661  * \retval              0 for success
6662  * \retval              negative error number on failure
6663  */
6664 int lfsck_links_get_first(const struct lu_env *env, struct dt_object *obj,
6665                           char *name, struct lu_fid *pfid)
6666 {
6667         struct lu_name           *cname = &lfsck_env_info(env)->lti_name;
6668         struct linkea_data        ldata = { NULL };
6669         int                       rc;
6670
6671         rc = lfsck_links_read_with_rec(env, obj, &ldata);
6672         if (rc)
6673                 return rc;
6674
6675         linkea_first_entry(&ldata);
6676         linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen, cname, pfid);
6677         /* To guarantee the 'name' is terminated with '0'. */
6678         memcpy(name, cname->ln_name, cname->ln_namelen);
6679         name[cname->ln_namelen] = 0;
6680
6681         return 0;
6682 }
6683
6684 /**
6685  * Update the object's name entry with the given FID.
6686  *
6687  * \param[in] env       pointer to the thread context
6688  * \param[in] lfsck     pointer to the lfsck instance
6689  * \param[in] dir       pointer to the directory that holds
6690  *                      the name entry
6691  * \param[in] name      the name for the entry to be updated
6692  * \param[in] fid       the new FID for the name entry referenced
6693  * \param[in] type      the type for the name entry to be updated
6694  *
6695  * \retval              0 for success
6696  * \retval              negative error number on failure
6697  */
6698 int lfsck_update_name_entry(const struct lu_env *env,
6699                             struct lfsck_instance *lfsck,
6700                             struct dt_object *dir, const char *name,
6701                             const struct lu_fid *fid, __u32 type)
6702 {
6703         struct lfsck_thread_info *info   = lfsck_env_info(env);
6704         struct dt_insert_rec     *rec    = &info->lti_dt_rec;
6705         struct lfsck_lock_handle *llh    = &info->lti_llh;
6706         struct dt_device         *dev    = lfsck_obj2dev(dir);
6707         struct thandle           *th;
6708         int                       rc;
6709         bool                      exists = true;
6710         ENTRY;
6711
6712         rc = lfsck_lock(env, lfsck, dir, name, llh,
6713                         MDS_INODELOCK_UPDATE, LCK_PW);
6714         if (rc != 0)
6715                 RETURN(rc);
6716
6717         th = dt_trans_create(env, dev);
6718         if (IS_ERR(th))
6719                 GOTO(unlock, rc = PTR_ERR(th));
6720
6721         rc = dt_declare_delete(env, dir, (const struct dt_key *)name, th);
6722         if (rc != 0)
6723                 GOTO(stop, rc);
6724
6725         rec->rec_type = type;
6726         rec->rec_fid = fid;
6727         rc = dt_declare_insert(env, dir, (const struct dt_rec *)rec,
6728                                (const struct dt_key *)name, th);
6729         if (rc != 0)
6730                 GOTO(stop, rc);
6731
6732         rc = dt_declare_ref_add(env, dir, th);
6733         if (rc != 0)
6734                 GOTO(stop, rc);
6735
6736         rc = dt_trans_start_local(env, dev, th);
6737         if (rc != 0)
6738                 GOTO(stop, rc);
6739
6740         rc = dt_delete(env, dir, (const struct dt_key *)name, th);
6741         if (rc == -ENOENT) {
6742                 exists = false;
6743                 rc = 0;
6744         }
6745
6746         if (rc != 0)
6747                 GOTO(stop, rc);
6748
6749         rc = dt_insert(env, dir, (const struct dt_rec *)rec,
6750                        (const struct dt_key *)name, th, 1);
6751         if (rc == 0 && S_ISDIR(type) && !exists) {
6752                 dt_write_lock(env, dir, 0);
6753                 rc = dt_ref_add(env, dir, th);
6754                 dt_write_unlock(env, dir);
6755         }
6756
6757         GOTO(stop, rc);
6758
6759 stop:
6760         dt_trans_stop(env, dev, th);
6761
6762 unlock:
6763         lfsck_unlock(llh);
6764         CDEBUG(D_LFSCK, "%s: update name entry "DFID"/%s with the FID "DFID
6765                " and the type %o: rc = %d\n", lfsck_lfsck2name(lfsck),
6766                PFID(lfsck_dto2fid(dir)), name, PFID(fid), type, rc);
6767
6768         return rc;
6769 }
6770
6771 int lfsck_namespace_setup(const struct lu_env *env,
6772                           struct lfsck_instance *lfsck)
6773 {
6774         struct lfsck_component  *com;
6775         struct lfsck_namespace  *ns;
6776         struct dt_object        *root = NULL;
6777         struct dt_object        *obj;
6778         int                      i;
6779         int                      rc;
6780         ENTRY;
6781
6782         LASSERT(lfsck->li_master);
6783
6784         OBD_ALLOC_PTR(com);
6785         if (com == NULL)
6786                 RETURN(-ENOMEM);
6787
6788         INIT_LIST_HEAD(&com->lc_link);
6789         INIT_LIST_HEAD(&com->lc_link_dir);
6790         init_rwsem(&com->lc_sem);
6791         atomic_set(&com->lc_ref, 1);
6792         com->lc_lfsck = lfsck;
6793         com->lc_type = LFSCK_TYPE_NAMESPACE;
6794         com->lc_ops = &lfsck_namespace_ops;
6795         com->lc_data = lfsck_assistant_data_init(
6796                         &lfsck_namespace_assistant_ops,
6797                         LFSCK_NAMESPACE);
6798         if (com->lc_data == NULL)
6799                 GOTO(out, rc = -ENOMEM);
6800
6801         com->lc_file_size = sizeof(struct lfsck_namespace);
6802         OBD_ALLOC(com->lc_file_ram, com->lc_file_size);
6803         if (com->lc_file_ram == NULL)
6804                 GOTO(out, rc = -ENOMEM);
6805
6806         OBD_ALLOC(com->lc_file_disk, com->lc_file_size);
6807         if (com->lc_file_disk == NULL)
6808                 GOTO(out, rc = -ENOMEM);
6809
6810         for (i = 0; i < LFSCK_STF_COUNT; i++)
6811                 mutex_init(&com->lc_sub_trace_objs[i].lsto_mutex);
6812
6813         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
6814         if (IS_ERR(root))
6815                 GOTO(out, rc = PTR_ERR(root));
6816
6817         if (unlikely(!dt_try_as_dir(env, root)))
6818                 GOTO(out, rc = -ENOTDIR);
6819
6820         obj = local_index_find_or_create(env, lfsck->li_los, root,
6821                                          LFSCK_NAMESPACE,
6822                                          S_IFREG | S_IRUGO | S_IWUSR,
6823                                          &dt_lfsck_namespace_features);
6824         if (IS_ERR(obj))
6825                 GOTO(out, rc = PTR_ERR(obj));
6826
6827         com->lc_obj = obj;
6828         rc = lfsck_namespace_load(env, com);
6829         if (rc == -ENODATA)
6830                 rc = lfsck_namespace_init(env, com);
6831         else if (rc < 0)
6832                 rc = lfsck_namespace_reset(env, com, true);
6833         else
6834                 rc = lfsck_load_sub_trace_files(env, com,
6835                         &dt_lfsck_namespace_features, LFSCK_NAMESPACE, false);
6836         if (rc != 0)
6837                 GOTO(out, rc);
6838
6839         ns = com->lc_file_ram;
6840         switch (ns->ln_status) {
6841         case LS_INIT:
6842         case LS_COMPLETED:
6843         case LS_FAILED:
6844         case LS_STOPPED:
6845                 spin_lock(&lfsck->li_lock);
6846                 list_add_tail(&com->lc_link, &lfsck->li_list_idle);
6847                 spin_unlock(&lfsck->li_lock);
6848                 break;
6849         default:
6850                 CERROR("%s: unknown lfsck_namespace status %d\n",
6851                        lfsck_lfsck2name(lfsck), ns->ln_status);
6852                 /* fall through */
6853         case LS_SCANNING_PHASE1:
6854         case LS_SCANNING_PHASE2:
6855                 /* No need to store the status to disk right now.
6856                  * If the system crashed before the status stored,
6857                  * it will be loaded back when next time. */
6858                 ns->ln_status = LS_CRASHED;
6859                 /* fall through */
6860         case LS_PAUSED:
6861         case LS_CRASHED:
6862                 spin_lock(&lfsck->li_lock);
6863                 list_add_tail(&com->lc_link, &lfsck->li_list_scan);
6864                 list_add_tail(&com->lc_link_dir, &lfsck->li_list_dir);
6865                 spin_unlock(&lfsck->li_lock);
6866                 break;
6867         }
6868
6869         GOTO(out, rc = 0);
6870
6871 out:
6872         if (root != NULL && !IS_ERR(root))
6873                 lfsck_object_put(env, root);
6874         if (rc != 0) {
6875                 lfsck_component_cleanup(env, com);
6876                 CERROR("%s: fail to init namespace LFSCK component: rc = %d\n",
6877                        lfsck_lfsck2name(lfsck), rc);
6878         }
6879         return rc;
6880 }