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_of(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                 clear_bit(LAD_INCOMPLETE, &lad->lad_flags);
 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                 clear_bit(LAD_INCOMPLETE, &lad->lad_flags);
 330         else
 331                 set_bit(LAD_INCOMPLETE, &lad->lad_flags);
 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 = lfsck_trans_create(env, dev, lfsck);
 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);
 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_dir(env, dir, name, fid);
 600         if (rc == -ENOENT)
 601                 RETURN(LFSCK_NAMEENTRY_REMOVED);
 602
 603         if (rc < 0)
 604                 RETURN(rc);
 605
 606         if (!lu_fid_eq(fid, lfsck_dto2fid(obj)))
 607                 RETURN(LFSCK_NAMEENTRY_RECREATED);
 608
 609         RETURN(0);
 610 }
 611
 612 static int lfsck_declare_namespace_exec_dir(const struct lu_env *env,
 613                                             struct dt_object *obj,
 614                                             struct thandle *handle)
 615 {
 616         int rc;
 617
 618         /* For remote updating LINKEA, there may be further LFSCK action
 619          * on remote MDT after the updating, so update the LINKEA ASAP. */
 620         if (dt_object_remote(obj))
 621                 handle->th_sync = 1;
 622
 623         /* For destroying all invalid linkEA entries. */
 624         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, handle);
 625         if (rc == 0)
 626                 /* For insert new linkEA entry. */
 627                 rc = dt_declare_xattr_set(env, obj,
 628                         lfsck_buf_get_const(env, NULL, MAX_LINKEA_SIZE),
 629                         XATTR_NAME_LINK, 0, handle);
 630         return rc;
 631 }
 632
 633 int __lfsck_links_read(const struct lu_env *env, struct dt_object *obj,
 634                        struct linkea_data *ldata, bool with_rec)
 635 {
 636         int rc;
 637
 638         if (ldata->ld_buf->lb_buf == NULL)
 639                 return -ENOMEM;
 640
 641         if (!dt_object_exists(obj))
 642                 return -ENOENT;
 643
 644         rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK);
 645         if (rc == -ERANGE) {
 646                 /* Buf was too small, figure out what we need. */
 647                 rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LINK);
 648                 if (unlikely(rc == 0))
 649                         return -ENODATA;
 650
 651                 if (rc < 0)
 652                         return rc;
 653
 654                 lu_buf_realloc(ldata->ld_buf, rc);
 655                 if (ldata->ld_buf->lb_buf == NULL)
 656                         return -ENOMEM;
 657
 658                 rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK);
 659         }
 660
 661         if (unlikely(rc == 0))
 662                 return -ENODATA;
 663
 664         if (rc > 0) {
 665                 if (with_rec)
 666                         rc = linkea_init_with_rec(ldata);
 667                 else
 668                         rc = linkea_init(ldata);
 669         }
 670
 671         return rc;
 672 }
 673
 674 /**
 675  * Remove linkEA for the given object.
 676  *
 677  * The caller should take the ldlm lock before the calling.
 678  *
 679  * \param[in] env       pointer to the thread context
 680  * \param[in] com       pointer to the lfsck component
 681  * \param[in] obj       pointer to the dt_object to be handled
 682  *
 683  * \retval              0 for repaired cases
 684  * \retval              negative error number on failure
 685  */
 686 static int lfsck_namespace_links_remove(const struct lu_env *env,
 687                                         struct lfsck_component *com,
 688                                         struct dt_object *obj)
 689 {
 690         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 691         struct dt_device                *dev    = lfsck_obj2dev(obj);
 692         struct thandle                  *th     = NULL;
 693         int                              rc     = 0;
 694         ENTRY;
 695
 696         LASSERT(dt_object_remote(obj) == 0);
 697
 698         th = lfsck_trans_create(env, dev, lfsck);
 699         if (IS_ERR(th))
 700                 GOTO(log, rc = PTR_ERR(th));
 701
 702         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, th);
 703         if (rc != 0)
 704                 GOTO(stop, rc);
 705
 706         rc = dt_trans_start_local(env, dev, th);
 707         if (rc != 0)
 708                 GOTO(stop, rc);
 709
 710         dt_write_lock(env, obj, 0);
 711         if (unlikely(lfsck_is_dead_obj(obj)))
 712                 GOTO(unlock, rc = -ENOENT);
 713
 714         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
 715                 GOTO(unlock, rc = 0);
 716
 717         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, th);
 718
 719         GOTO(unlock, rc);
 720
 721 unlock:
 722         dt_write_unlock(env, obj);
 723
 724 stop:
 725         dt_trans_stop(env, dev, th);
 726
 727 log:
 728         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove invalid linkEA "
 729                "for the object "DFID": rc = %d\n",
 730                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
 731
 732         if (rc == 0) {
 733                 struct lfsck_namespace *ns = com->lc_file_ram;
 734
 735                 ns->ln_flags |= LF_INCONSISTENT;
 736         }
 737
 738         return rc;
 739 }
 740
 741 static int lfsck_links_write(const struct lu_env *env, struct dt_object *obj,
 742                              struct linkea_data *ldata, struct thandle *handle)
 743 {
 744         struct lu_buf buf;
 745         int rc;
 746
 747         lfsck_buf_init(&buf, ldata->ld_buf->lb_buf, ldata->ld_leh->leh_len);
 748
 749 again:
 750         rc = dt_xattr_set(env, obj, &buf, XATTR_NAME_LINK, 0, handle);
 751         if (unlikely(rc == -ENOSPC)) {
 752                 rc = linkea_overflow_shrink(ldata);
 753                 if (likely(rc > 0)) {
 754                         buf.lb_len = rc;
 755                         goto again;
 756                 }
 757         }
 758
 759         return rc;
 760 }
 761
 762 static inline bool linkea_reclen_is_valid(const struct linkea_data *ldata)
 763 {
 764         if (ldata->ld_reclen <= 0)
 765                 return false;
 766
 767         if ((char *)ldata->ld_lee + ldata->ld_reclen >
 768             (char *)ldata->ld_leh + ldata->ld_leh->leh_len)
 769                 return false;
 770
 771         return true;
 772 }
 773
 774 static inline bool linkea_entry_is_valid(const struct linkea_data *ldata,
 775                                          const struct lu_name *cname,
 776                                          const struct lu_fid *pfid)
 777 {
 778         if (!linkea_reclen_is_valid(ldata))
 779                 return false;
 780
 781         if (cname->ln_namelen <= 0 || cname->ln_namelen > NAME_MAX)
 782                 return false;
 783
 784         if (!fid_is_sane(pfid))
 785                 return false;
 786
 787         return true;
 788 }
 789
 790 static int lfsck_namespace_unpack_linkea_entry(struct linkea_data *ldata,
 791                                                struct lu_name *cname,
 792                                                struct lu_fid *pfid,
 793                                                char *buf, const int buflen)
 794 {
 795         linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, cname, pfid);
 796         if (unlikely(!linkea_entry_is_valid(ldata, cname, pfid)))
 797                 return -EINVAL;
 798
 799         /* To guarantee the 'name' is terminated with '0'. */
 800         memcpy(buf, cname->ln_name, cname->ln_namelen);
 801         buf[cname->ln_namelen] = 0;
 802         cname->ln_name = buf;
 803
 804         return 0;
 805 }
 806
 807 static void lfsck_linkea_del_buf(struct linkea_data *ldata,
 808                                  const struct lu_name *lname)
 809 {
 810         LASSERT(ldata->ld_leh != NULL && ldata->ld_lee != NULL);
 811
 812         /* If current record is corrupted, all the subsequent
 813          * records will be dropped. */
 814         if (unlikely(!linkea_reclen_is_valid(ldata))) {
 815                 void *ptr = ldata->ld_lee;
 816
 817                 ldata->ld_leh->leh_len = sizeof(struct link_ea_header);
 818                 ldata->ld_leh->leh_reccount = 0;
 819                 linkea_first_entry(ldata);
 820                 while (ldata->ld_lee != NULL &&
 821                        (char *)ldata->ld_lee < (char *)ptr) {
 822                         int reclen = (ldata->ld_lee->lee_reclen[0] << 8) |
 823                                      ldata->ld_lee->lee_reclen[1];
 824
 825                         ldata->ld_leh->leh_len += reclen;
 826                         ldata->ld_leh->leh_reccount++;
 827                         ldata->ld_lee = (struct link_ea_entry *)
 828                                         ((char *)ldata->ld_lee + reclen);
 829                 }
 830
 831                 ldata->ld_lee = NULL;
 832         } else {
 833                 linkea_del_buf(ldata, lname, false);
 834         }
 835 }
 836
 837 static int lfsck_namespace_filter_linkea_entry(struct linkea_data *ldata,
 838                                                struct lu_name *cname,
 839                                                struct lu_fid *pfid,
 840                                                bool remove)
 841 {
 842         struct link_ea_entry    *oldlee;
 843         int                      oldlen;
 844         int                      repeated = 0;
 845
 846         oldlee = ldata->ld_lee;
 847         oldlen = ldata->ld_reclen;
 848         linkea_next_entry(ldata);
 849         while (ldata->ld_lee != NULL) {
 850                 ldata->ld_reclen = (ldata->ld_lee->lee_reclen[0] << 8) |
 851                                    ldata->ld_lee->lee_reclen[1];
 852                 if (unlikely(!linkea_reclen_is_valid(ldata))) {
 853                         lfsck_linkea_del_buf(ldata, NULL);
 854                         LASSERT(ldata->ld_lee == NULL);
 855                 } else if (unlikely(ldata->ld_reclen == oldlen &&
 856                              memcmp(ldata->ld_lee, oldlee, oldlen) == 0)) {
 857                         repeated++;
 858                         if (!remove)
 859                                 break;
 860
 861                         lfsck_linkea_del_buf(ldata, cname);
 862                 } else {
 863                         linkea_next_entry(ldata);
 864                 }
 865         }
 866         ldata->ld_lee = oldlee;
 867         ldata->ld_reclen = oldlen;
 868
 869         return repeated;
 870 }
 871
 872 /**
 873  * Insert orphan into .lustre/lost+found/MDTxxxx/ locally.
 874  *
 875  * Add the specified orphan MDT-object to the .lustre/lost+found/MDTxxxx/
 876  * with the given type to generate the name, the detailed rules for name
 877  * have been described as following.
 878  *
 879  * The function also generates the linkEA corresponding to the name entry
 880  * under the .lustre/lost+found/MDTxxxx/ for the orphan MDT-object.
 881  *
 882  * \param[in] env       pointer to the thread context
 883  * \param[in] com       pointer to the lfsck component
 884  * \param[in] orphan    pointer to the orphan MDT-object
 885  * \param[in] infix     additional information for the orphan name, such as
 886  *                      the FID for original
 887  * \param[in] type      the type for describing why the orphan MDT-object is
 888  *                      created. The rules are as following:
 889  *
 890  *  type "D":           The MDT-object is a directory, it may knows its parent
 891  *                      but because there is no valid linkEA, the LFSCK cannot
 892  *                      know where to put it back to the namespace.
 893  *  type "O":           The MDT-object has no linkEA, and there is no name
 894  *                      entry that references the MDT-object.
 895  *
 896  *  type "S":           The orphan MDT-object is a shard of a striped directory
 897  *
 898  * \see lfsck_layout_recreate_parent() for more types.
 899  *
 900  * The orphan name will be like:
 901  * ${FID}-${infix}-${type}-${conflict_version}
 902  *
 903  * \param[out] count    if some others inserted some linkEA entries by race,
 904  *                      then return the linkEA entries count.
 905  *
 906  * \retval              positive number for repaired cases
 907  * \retval              0 if needs to repair nothing
 908  * \retval              negative error number on failure
 909  */
 910 static int lfsck_namespace_insert_orphan(const struct lu_env *env,
 911                                          struct lfsck_component *com,
 912                                          struct dt_object *orphan,
 913                                          const char *infix, const char *type,
 914                                          int *count)
 915 {
 916         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 917         struct lu_name                  *cname  = &info->lti_name;
 918         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
 919         struct lu_attr                  *la     = &info->lti_la2;
 920         const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
 921         const struct lu_fid             *pfid;
 922         struct lu_fid                    tfid;
 923         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 924         struct dt_device                *dev    = lfsck_obj2dev(orphan);
 925         struct dt_object                *parent;
 926         struct thandle                  *th     = NULL;
 927         struct lfsck_lock_handle        *pllh   = &info->lti_llh;
 928         struct lustre_handle             clh    = { 0 };
 929         struct linkea_data               ldata2 = { NULL };
 930         struct lu_buf                    linkea_buf;
 931         int                              namelen;
 932         int                              idx    = 0;
 933         int                              rc     = 0;
 934         bool                             exist  = false;
 935         ENTRY;
 936
 937         cname->ln_name = NULL;
 938         if (unlikely(lfsck->li_lpf_obj == NULL))
 939                 GOTO(log, rc = -ENXIO);
 940
 941         parent = lfsck->li_lpf_obj;
 942         pfid = lfsck_dto2fid(parent);
 943
 944 again:
 945         do {
 946                 namelen = snprintf(info->lti_key, NAME_MAX, DFID"%s-%s-%d",
 947                                    PFID(cfid), infix, type, idx++);
 948                 rc = dt_lookup_dir(env, parent, info->lti_key, &tfid);
 949                 if (rc != 0 && rc != -ENOENT)
 950                         GOTO(log, rc);
 951
 952                 if (unlikely(rc == 0 && lu_fid_eq(cfid, &tfid)))
 953                         exist = true;
 954         } while (rc == 0 && !exist);
 955
 956         rc = lfsck_lock(env, lfsck, parent, info->lti_key, pllh,
 957                         MDS_INODELOCK_UPDATE, LCK_PW);
 958         if (rc != 0)
 959                 GOTO(log, rc);
 960
 961         /* Re-check whether the name conflict with othrs after taken
 962          * the ldlm lock. */
 963         rc = dt_lookup_dir(env, parent, info->lti_key, &tfid);
 964         if (rc == 0) {
 965                 if (!lu_fid_eq(cfid, &tfid)) {
 966                         exist = false;
 967                         lfsck_unlock(pllh);
 968                         goto again;
 969                 }
 970
 971                 exist = true;
 972         } else if (rc != -ENOENT) {
 973                 GOTO(log, rc);
 974         } else {
 975                 exist = false;
 976         }
 977
 978         cname->ln_name = info->lti_key;
 979         cname->ln_namelen = namelen;
 980         rc = linkea_links_new(&ldata2, &info->lti_linkea_buf2,
 981                               cname, pfid);
 982         if (rc != 0)
 983                 GOTO(log, rc);
 984
 985         rc = lfsck_ibits_lock(env, lfsck, orphan, &clh,
 986                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_LOOKUP |
 987                               MDS_INODELOCK_XATTR, LCK_EX);
 988         if (rc != 0)
 989                 GOTO(log, rc);
 990
 991         lfsck_buf_init(&linkea_buf, ldata2.ld_buf->lb_buf,
 992                        ldata2.ld_leh->leh_len);
 993         th = lfsck_trans_create(env, dev, lfsck);
 994         if (IS_ERR(th))
 995                 GOTO(log, rc = PTR_ERR(th));
 996
 997         if (S_ISDIR(lfsck_object_type(orphan))) {
 998                 rc = dt_declare_delete(env, orphan,
 999                                        (const struct dt_key *)dotdot, th);
1000                 if (rc != 0)
1001                         GOTO(stop, rc);
1002
1003                 rec->rec_type = S_IFDIR;
1004                 rec->rec_fid = pfid;
1005                 rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
1006                                        (const struct dt_key *)dotdot, th);
1007                 if (rc != 0)
1008                         GOTO(stop, rc);
1009         }
1010
1011         rc = dt_declare_xattr_set(env, orphan, &linkea_buf,
1012                                   XATTR_NAME_LINK, 0, th);
1013         if (rc != 0)
1014                 GOTO(stop, rc);
1015
1016         if (!exist) {
1017                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
1018                 rec->rec_fid = cfid;
1019                 rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1020                                        (const struct dt_key *)cname->ln_name,
1021                                        th);
1022                 if (rc != 0)
1023                         GOTO(stop, rc);
1024
1025                 if (S_ISDIR(rec->rec_type)) {
1026                         rc = dt_declare_ref_add(env, parent, th);
1027                         if (rc != 0)
1028                                 GOTO(stop, rc);
1029                 }
1030         }
1031
1032         memset(la, 0, sizeof(*la));
1033         la->la_ctime = ktime_get_real_seconds();
1034         la->la_valid = LA_CTIME;
1035         rc = dt_declare_attr_set(env, orphan, la, th);
1036         if (rc != 0)
1037                 GOTO(stop, rc);
1038
1039         rc = dt_trans_start_local(env, dev, th);
1040         if (rc != 0)
1041                 GOTO(stop, rc);
1042
1043         dt_write_lock(env, orphan, 0);
1044         rc = lfsck_links_read2_with_rec(env, orphan, &ldata2);
1045         if (likely(rc == -ENODATA || rc == -EINVAL)) {
1046                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1047                         GOTO(unlock, rc = 1);
1048
1049                 if (S_ISDIR(lfsck_object_type(orphan))) {
1050                         rc = dt_delete(env, orphan,
1051                                        (const struct dt_key *)dotdot, th);
1052                         if (rc != 0)
1053                                 GOTO(unlock, rc);
1054
1055                         rec->rec_type = S_IFDIR;
1056                         rec->rec_fid = pfid;
1057                         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1058                                        (const struct dt_key *)dotdot, th);
1059                         if (rc != 0)
1060                                 GOTO(unlock, rc);
1061                 }
1062
1063                 rc = dt_xattr_set(env, orphan, &linkea_buf, XATTR_NAME_LINK, 0,
1064                                   th);
1065         } else {
1066                 if (rc == 0 && count != NULL)
1067                         *count = ldata2.ld_leh->leh_reccount;
1068
1069                 GOTO(unlock, rc);
1070         }
1071         dt_write_unlock(env, orphan);
1072
1073         if (rc == 0 && !exist) {
1074                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
1075                 rec->rec_fid = cfid;
1076                 rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1077                                (const struct dt_key *)cname->ln_name, th);
1078                 if (rc == 0 && S_ISDIR(rec->rec_type)) {
1079                         dt_write_lock(env, parent, 0);
1080                         rc = dt_ref_add(env, parent, th);
1081                         dt_write_unlock(env, parent);
1082                 }
1083         }
1084
1085         if (rc == 0)
1086                 rc = dt_attr_set(env, orphan, la, th);
1087
1088         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1089
1090 unlock:
1091         dt_write_unlock(env, orphan);
1092
1093 stop:
1094         dt_trans_stop(env, dev, th);
1095
1096 log:
1097         lfsck_ibits_unlock(&clh, LCK_EX);
1098         lfsck_unlock(pllh);
1099         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert orphan for the "
1100                "object "DFID", name = %s: rc = %d\n",
1101                lfsck_lfsck2name(lfsck), PFID(cfid),
1102                cname->ln_name != NULL ? cname->ln_name : "<NULL>", rc);
1103
1104         if (rc != 0) {
1105                 struct lfsck_namespace *ns = com->lc_file_ram;
1106
1107                 ns->ln_flags |= LF_INCONSISTENT;
1108         }
1109
1110         return rc;
1111 }
1112
1113 static int lfsck_lmv_set(const struct lu_env *env,
1114                          struct lfsck_instance *lfsck,
1115                          struct dt_object *obj,
1116                          struct lmv_mds_md_v1 *lmv)
1117 {
1118         struct dt_device *dev = lfsck->li_next;
1119         struct thandle *th = NULL;
1120         struct lu_buf buf = { lmv, sizeof(*lmv) };
1121         int rc;
1122
1123         ENTRY;
1124
1125         th = lfsck_trans_create(env, dev, lfsck);
1126         if (IS_ERR(th))
1127                 RETURN(PTR_ERR(th));
1128
1129         rc = dt_declare_xattr_set(env, obj, &buf, XATTR_NAME_LMV, 0, th);
1130         if (rc)
1131                 GOTO(stop, rc);
1132
1133         rc = dt_trans_start_local(env, dev, th);
1134         if (rc != 0)
1135                 GOTO(stop, rc);
1136
1137         rc = dt_xattr_set(env, obj, &buf, XATTR_NAME_LMV, 0, th);
1138         if (rc)
1139                 GOTO(stop, rc);
1140
1141         EXIT;
1142 stop:
1143         dt_trans_stop(env, dev, th);
1144
1145         return rc;
1146 }
1147
1148 static int lfsck_lmv_delete(const struct lu_env *env,
1149                             struct lfsck_instance *lfsck,
1150                             struct dt_object *obj)
1151 {
1152         struct dt_device *dev = lfsck->li_next;
1153         struct thandle *th = NULL;
1154         int rc;
1155
1156         ENTRY;
1157
1158         th = lfsck_trans_create(env, dev, lfsck);
1159         if (IS_ERR(th))
1160                 RETURN(PTR_ERR(th));
1161
1162         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LMV, th);
1163         if (rc)
1164                 GOTO(stop, rc);
1165
1166         rc = dt_trans_start_local(env, dev, th);
1167         if (rc != 0)
1168                 GOTO(stop, rc);
1169
1170         rc = dt_xattr_del(env, obj, XATTR_NAME_LMV, th);
1171         if (rc)
1172                 GOTO(stop, rc);
1173
1174         EXIT;
1175 stop:
1176         dt_trans_stop(env, dev, th);
1177
1178         return rc;
1179 }
1180
1181 static inline int lfsck_object_is_shard(const struct lu_env *env,
1182                                         struct lfsck_instance *lfsck,
1183                                         struct dt_object *obj,
1184                                         const struct lu_name *lname)
1185 {
1186         struct lfsck_thread_info *info = lfsck_env_info(env);
1187         struct lmv_mds_md_v1 *lmv = &info->lti_lmv;
1188         int rc;
1189
1190         rc = lfsck_shard_name_to_index(env, lname->ln_name, lname->ln_namelen,
1191                                        lfsck_object_type(obj),
1192                                        lfsck_dto2fid(obj));
1193         if (rc < 0)
1194                 return 0;
1195
1196         rc = lfsck_read_stripe_lmv(env, lfsck, obj, lmv);
1197         if (rc == -ENODATA)
1198                 return 0;
1199
1200         if (!rc && lmv->lmv_magic == LMV_MAGIC_STRIPE)
1201                 return 1;
1202
1203         return rc;
1204 }
1205
1206 /**
1207  * Add the specified name entry back to namespace.
1208  *
1209  * If there is a linkEA entry that back references a name entry under
1210  * some parent directory, but such parent directory does not have the
1211  * claimed name entry. On the other hand, the linkEA entries count is
1212  * not larger than the MDT-object's hard link count. Under such case,
1213  * it is quite possible that the name entry is lost. Then the LFSCK
1214  * should add the name entry back to the namespace.
1215  *
1216  * If \a child is shard, which means \a parent is a striped directory,
1217  * if \a parent has LMV, we need to delete it before insertion because
1218  * now parent's striping is broken and can't be parsed correctly.
1219  *
1220  * \param[in] env       pointer to the thread context
1221  * \param[in] com       pointer to the lfsck component
1222  * \param[in] parent    pointer to the directory under which the name entry
1223  *                      will be inserted into
1224  * \param[in] child     pointer to the object referenced by the name entry
1225  *                      that to be inserted into the parent
1226  * \param[in] lname     the name for the child in the parent directory
1227  *
1228  * \retval              positive number for repaired cases
1229  * \retval              0 if nothing to be repaired
1230  * \retval              negative error number on failure
1231  */
1232 static int lfsck_namespace_insert_normal(const struct lu_env *env,
1233                                          struct lfsck_component *com,
1234                                          struct dt_object *parent,
1235                                          struct dt_object *child,
1236                                          const struct lu_name *lname)
1237 {
1238         struct lfsck_thread_info *info = lfsck_env_info(env);
1239         struct lu_attr *la = &info->lti_la;
1240         struct dt_insert_rec *rec = &info->lti_dt_rec;
1241         struct lfsck_instance *lfsck = com->lc_lfsck;
1242         /* The child and its name may be on different MDTs. */
1243         const struct lu_fid *pfid = lfsck_dto2fid(parent);
1244         const struct lu_fid *cfid = lfsck_dto2fid(child);
1245         struct dt_device *dev = lfsck->li_next;
1246         struct thandle *th = NULL;
1247         struct lfsck_lock_handle *llh = &info->lti_llh;
1248         struct lmv_mds_md_v1 *lmv = &info->lti_lmv;
1249         struct lu_buf buf = { lmv, sizeof(*lmv) };
1250         /* whether parent's LMV is deleted before insertion */
1251         bool parent_lmv_deleted = false;
1252         /* whether parent's LMV is missing */
1253         bool parent_lmv_lost = false;
1254         int rc = 0;
1255
1256         ENTRY;
1257
1258         /* @parent/@child may be based on lfsck->li_bottom,
1259          * but here we need the object based on the lfsck->li_next. */
1260
1261         parent = lfsck_object_locate(dev, parent);
1262         if (IS_ERR(parent))
1263                 GOTO(log, rc = PTR_ERR(parent));
1264
1265         child = lfsck_object_locate(dev, child);
1266         if (IS_ERR(child))
1267                 GOTO(log, rc = PTR_ERR(child));
1268
1269         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1270                 GOTO(log, rc = 1);
1271
1272         rc = lfsck_lock(env, lfsck, parent, lname->ln_name, llh,
1273                         MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
1274                         MDS_INODELOCK_XATTR, LCK_EX);
1275         if (rc)
1276                 GOTO(log, rc);
1277
1278         rc = lfsck_object_is_shard(env, lfsck, child, lname);
1279         if (rc < 0)
1280                 GOTO(unlock, rc);
1281
1282         if (rc == 1) {
1283                 rc = lfsck_read_stripe_lmv(env, lfsck, parent, lmv);
1284                 if (!rc) {
1285                         /*
1286                          * To add a shard, we need to convert parent to a
1287                          * plain directory by deleting its LMV, and after
1288                          * insertion set it back.
1289                          */
1290                         rc = lfsck_lmv_delete(env, lfsck, parent);
1291                         if (rc)
1292                                 GOTO(unlock, rc);
1293                         parent_lmv_deleted = true;
1294                         lmv->lmv_layout_version++;
1295                         lfsck_lmv_header_cpu_to_le(lmv, lmv);
1296                 } else if (rc == -ENODATA) {
1297                         struct lu_seq_range *range = &info->lti_range;
1298                         struct seq_server_site *ss = lfsck_dev_site(lfsck);
1299
1300                         rc = lfsck_read_stripe_lmv(env, lfsck, child, lmv);
1301                         if (rc)
1302                                 GOTO(unlock, rc);
1303
1304                         fld_range_set_mdt(range);
1305                         rc = fld_server_lookup(env, ss->ss_server_fld,
1306                                        fid_seq(lfsck_dto2fid(parent)), range);
1307                         if (rc)
1308                                 GOTO(unlock, rc);
1309
1310                         parent_lmv_lost = true;
1311                         lmv->lmv_magic = LMV_MAGIC;
1312                         lmv->lmv_master_mdt_index = range->lsr_index;
1313                         lmv->lmv_layout_version++;
1314                         lfsck_lmv_header_cpu_to_le(lmv, lmv);
1315                 } else {
1316                         GOTO(unlock, rc);
1317                 }
1318         }
1319
1320         if (unlikely(!dt_try_as_dir(env, parent)))
1321                 GOTO(unlock, rc = -ENOTDIR);
1322
1323         th = lfsck_trans_create(env, dev, lfsck);
1324         if (IS_ERR(th))
1325                 GOTO(unlock, rc = PTR_ERR(th));
1326
1327         rec->rec_type = lfsck_object_type(child) & S_IFMT;
1328         rec->rec_fid = cfid;
1329         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1330                                (const struct dt_key *)lname->ln_name, th);
1331         if (rc != 0)
1332                 GOTO(stop, rc);
1333
1334         if (S_ISDIR(rec->rec_type)) {
1335                 rc = dt_declare_ref_add(env, parent, th);
1336                 if (rc != 0)
1337                         GOTO(stop, rc);
1338         }
1339
1340         if (parent_lmv_lost) {
1341                 rc = dt_declare_xattr_set(env, parent, &buf, XATTR_NAME_LMV,
1342                                           0, th);
1343                 if (rc)
1344                         GOTO(stop, rc);
1345         }
1346
1347         la->la_ctime = ktime_get_real_seconds();
1348         la->la_valid = LA_CTIME;
1349         rc = dt_declare_attr_set(env, parent, la, th);
1350         if (rc != 0)
1351                 GOTO(stop, rc);
1352
1353         rc = dt_declare_attr_set(env, child, la, th);
1354         if (rc != 0)
1355                 GOTO(stop, rc);
1356
1357         rc = dt_trans_start_local(env, dev, th);
1358         if (rc != 0)
1359                 GOTO(stop, rc);
1360
1361         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1362                        (const struct dt_key *)lname->ln_name, th);
1363         if (rc != 0)
1364                 GOTO(stop, rc);
1365
1366         if (S_ISDIR(rec->rec_type)) {
1367                 dt_write_lock(env, parent, 0);
1368                 rc = dt_ref_add(env, parent, th);
1369                 dt_write_unlock(env, parent);
1370                 if (rc != 0)
1371                         GOTO(stop, rc);
1372         }
1373
1374         if (parent_lmv_lost) {
1375                 rc = dt_xattr_set(env, parent, &buf, XATTR_NAME_LMV, 0, th);
1376                 if (rc)
1377                         GOTO(stop, rc);
1378         }
1379
1380         rc = dt_attr_set(env, parent, la, th);
1381         if (rc != 0)
1382                 GOTO(stop, rc);
1383
1384         rc = dt_attr_set(env, child, la, th);
1385
1386         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1387
1388 stop:
1389         dt_trans_stop(env, dev, th);
1390
1391 unlock:
1392         if (parent_lmv_deleted)
1393                 lfsck_lmv_set(env, lfsck, parent, lmv);
1394
1395         lfsck_unlock(llh);
1396
1397 log:
1398         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert object "DFID" with "
1399                "the name %s and type %o to the parent "DFID": rc = %d\n",
1400                lfsck_lfsck2name(lfsck), PFID(cfid), lname->ln_name,
1401                lfsck_object_type(child) & S_IFMT, PFID(pfid), rc);
1402
1403         if (rc != 0) {
1404                 struct lfsck_namespace *ns = com->lc_file_ram;
1405
1406                 ns->ln_flags |= LF_INCONSISTENT;
1407                 if (rc > 0)
1408                         ns->ln_lost_dirent_repaired++;
1409         }
1410
1411         return rc;
1412 }
1413
1414 /**
1415  * Create the specified orphan directory.
1416  *
1417  * For the case that the parent MDT-object stored in some MDT-object's
1418  * linkEA entry is lost, the LFSCK will re-create the parent object as
1419  * an orphan and insert it into .lustre/lost+found/MDTxxxx/ directory
1420  * with the name ${FID}-P-${conflict_version}.
1421  *
1422  * \param[in] env       pointer to the thread context
1423  * \param[in] com       pointer to the lfsck component
1424  * \param[in] orphan    pointer to the orphan MDT-object to be created
1425  * \param[in] lmv       pointer to master LMV EA that will be set to the orphan
1426  *
1427  * \retval              positive number for repaired cases
1428  * \retval              negative error number on failure
1429  */
1430 static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
1431                                              struct lfsck_component *com,
1432                                              struct dt_object *orphan,
1433                                              struct lmv_mds_md_v1 *lmv)
1434 {
1435         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1436         struct lu_attr                  *la     = &info->lti_la;
1437         struct dt_allocation_hint       *hint   = &info->lti_hint;
1438         struct dt_object_format         *dof    = &info->lti_dof;
1439         struct lu_name                  *cname  = &info->lti_name2;
1440         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1441         struct lmv_mds_md_v1            *lmv2   = &info->lti_lmv2;
1442         const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
1443         struct lu_fid                    tfid;
1444         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1445         struct lfsck_namespace          *ns     = com->lc_file_ram;
1446         struct dt_device                *dev    = lfsck_obj2dev(orphan);
1447         struct dt_object                *parent = NULL;
1448         struct thandle                  *th     = NULL;
1449         struct lfsck_lock_handle        *llh    = &info->lti_llh;
1450         struct linkea_data               ldata  = { NULL };
1451         struct lu_buf                    linkea_buf;
1452         struct lu_buf                    lmv_buf;
1453         char                             name[32];
1454         int                              namelen;
1455         int                              idx    = 0;
1456         int                              rc     = 0;
1457         int                              rc1    = 0;
1458         ENTRY;
1459
1460         LASSERT(!dt_object_exists(orphan));
1461
1462         cname->ln_name = NULL;
1463         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1464                 GOTO(log, rc = 1);
1465
1466         if (dt_object_remote(orphan)) {
1467                 if (lfsck->li_lpf_root_obj == NULL)
1468                         GOTO(log, rc = -EBADF);
1469
1470                 idx = lfsck_find_mdt_idx_by_fid(env, lfsck, cfid);
1471                 if (idx < 0)
1472                         GOTO(log, rc = idx);
1473
1474                 snprintf(name, 8, "MDT%04x", idx);
1475                 rc = dt_lookup_dir(env, lfsck->li_lpf_root_obj, name, &tfid);
1476                 if (rc != 0)
1477                         GOTO(log, rc = (rc == -ENOENT ? -ENXIO : rc));
1478
1479                 parent = lfsck_object_find_bottom(env, lfsck, &tfid);
1480                 if (IS_ERR(parent))
1481                         GOTO(log, rc = PTR_ERR(parent));
1482
1483                 if (unlikely(!dt_try_as_dir(env, parent)))
1484                         GOTO(log, rc = -ENOTDIR);
1485         } else {
1486                 if (unlikely(lfsck->li_lpf_obj == NULL))
1487                         GOTO(log, rc = -ENXIO);
1488
1489                 parent = lfsck->li_lpf_obj;
1490         }
1491
1492         dev = lfsck_find_dev_by_fid(env, lfsck, cfid);
1493         if (IS_ERR(dev))
1494                 GOTO(log, rc = PTR_ERR(dev));
1495
1496         idx = 0;
1497
1498 again:
1499         do {
1500                 namelen = snprintf(name, 31, DFID"-P-%d",
1501                                    PFID(cfid), idx++);
1502                 rc = dt_lookup_dir(env, parent, name, &tfid);
1503                 if (rc != 0 && rc != -ENOENT)
1504                         GOTO(log, rc);
1505         } while (rc == 0);
1506
1507         rc = lfsck_lock(env, lfsck, parent, name, llh,
1508                         MDS_INODELOCK_UPDATE, LCK_PW);
1509         if (rc != 0)
1510                 GOTO(log, rc);
1511
1512         /* Re-check whether the name conflict with othrs after taken
1513          * the ldlm lock. */
1514         rc = dt_lookup_dir(env, parent, name, &tfid);
1515         if (unlikely(rc == 0)) {
1516                 lfsck_unlock(llh);
1517                 goto again;
1518         }
1519
1520         if (rc != -ENOENT)
1521                 GOTO(unlock1, rc);
1522
1523         cname->ln_name = name;
1524         cname->ln_namelen = namelen;
1525
1526         memset(la, 0, sizeof(*la));
1527         la->la_mode = S_IFDIR | 0700;
1528         la->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
1529                        LA_ATIME | LA_MTIME | LA_CTIME;
1530
1531         orphan->do_ops->do_ah_init(env, hint, parent, orphan,
1532                                    la->la_mode & S_IFMT);
1533
1534         memset(dof, 0, sizeof(*dof));
1535         dof->dof_type = dt_mode_to_dft(S_IFDIR);
1536
1537         rc = linkea_links_new(&ldata, &info->lti_linkea_buf2,
1538                               cname, lfsck_dto2fid(parent));
1539         if (rc != 0)
1540                 GOTO(unlock1, rc);
1541
1542         th = lfsck_trans_create(env, dev, lfsck);
1543         if (IS_ERR(th))
1544                 GOTO(unlock1, rc = PTR_ERR(th));
1545
1546         /* Sync the remote transaction to guarantee that the subsequent
1547          * lock against the @orphan can find the @orphan in time. */
1548         if (dt_object_remote(orphan))
1549                 th->th_sync = 1;
1550
1551         rc = dt_declare_create(env, orphan, la, hint, dof, th);
1552         if (rc != 0)
1553                 GOTO(stop, rc);
1554
1555         if (unlikely(!dt_try_as_dir(env, orphan)))
1556                 GOTO(stop, rc = -ENOTDIR);
1557
1558         rc = dt_declare_ref_add(env, orphan, th);
1559         if (rc != 0)
1560                 GOTO(stop, rc);
1561
1562         rec->rec_type = S_IFDIR;
1563         rec->rec_fid = cfid;
1564         rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
1565                                (const struct dt_key *)dot, th);
1566         if (rc != 0)
1567                 GOTO(stop, rc);
1568
1569         rec->rec_fid = lfsck_dto2fid(parent);
1570         rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
1571                                (const struct dt_key *)dotdot, th);
1572         if (rc != 0)
1573                 GOTO(stop, rc);
1574
1575         if (lmv != NULL) {
1576                 lmv->lmv_magic = LMV_MAGIC;
1577                 lmv->lmv_master_mdt_index = lfsck_dev_idx(lfsck);
1578                 lfsck_lmv_header_cpu_to_le(lmv2, lmv);
1579                 lfsck_buf_init(&lmv_buf, lmv2, sizeof(*lmv2));
1580                 rc = dt_declare_xattr_set(env, orphan, &lmv_buf, XATTR_NAME_LMV,
1581                                           0, th);
1582                 if (rc != 0)
1583                         GOTO(stop, rc);
1584         }
1585
1586         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
1587                        ldata.ld_leh->leh_len);
1588         rc = dt_declare_xattr_set(env, orphan, &linkea_buf,
1589                                   XATTR_NAME_LINK, 0, th);
1590         if (rc != 0)
1591                 GOTO(stop, rc);
1592
1593         rec->rec_fid = cfid;
1594         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1595                                (const struct dt_key *)name, th);
1596         if (rc == 0)
1597                 rc = dt_declare_ref_add(env, parent, th);
1598
1599         if (rc != 0)
1600                 GOTO(stop, rc);
1601
1602         rc = dt_trans_start_local(env, dev, th);
1603         if (rc != 0)
1604                 GOTO(stop, rc);
1605
1606         dt_write_lock(env, orphan, 0);
1607         rc = dt_create(env, orphan, la, hint, dof, th);
1608         if (rc != 0)
1609                 GOTO(unlock2, rc);
1610
1611         rc = dt_ref_add(env, orphan, th);
1612         if (rc != 0)
1613                 GOTO(unlock2, rc);
1614
1615         rec->rec_fid = cfid;
1616         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1617                        (const struct dt_key *)dot, th);
1618         if (rc != 0)
1619                 GOTO(unlock2, rc);
1620
1621         rec->rec_fid = lfsck_dto2fid(parent);
1622         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1623                        (const struct dt_key *)dotdot, th);
1624         if (rc != 0)
1625                 GOTO(unlock2, rc);
1626
1627         if (lmv != NULL) {
1628                 rc = dt_xattr_set(env, orphan, &lmv_buf, XATTR_NAME_LMV, 0, th);
1629                 if (rc != 0)
1630                         GOTO(unlock2, rc);
1631         }
1632
1633         rc = dt_xattr_set(env, orphan, &linkea_buf,
1634                           XATTR_NAME_LINK, 0, th);
1635         dt_write_unlock(env, orphan);
1636         if (rc != 0)
1637                 GOTO(stop, rc);
1638
1639         rec->rec_fid = cfid;
1640         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1641                        (const struct dt_key *)name, th);
1642         if (rc == 0) {
1643                 dt_write_lock(env, parent, 0);
1644                 rc = dt_ref_add(env, parent, th);
1645                 dt_write_unlock(env, parent);
1646         }
1647
1648         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1649
1650 unlock2:
1651         dt_write_unlock(env, orphan);
1652
1653 stop:
1654         rc1 = dt_trans_stop(env, dev, th);
1655         if (rc1 != 0 && rc > 0)
1656                 rc = rc1;
1657
1658 unlock1:
1659         lfsck_unlock(llh);
1660
1661 log:
1662         CDEBUG(D_LFSCK, "%s: namespace LFSCK create orphan dir for "
1663                "the object "DFID", name = %s: rc = %d\n",
1664                lfsck_lfsck2name(lfsck), PFID(cfid),
1665                cname->ln_name != NULL ? cname->ln_name : "<NULL>", rc);
1666
1667         if (parent != NULL && !IS_ERR(parent) && parent != lfsck->li_lpf_obj)
1668                 lfsck_object_put(env, parent);
1669
1670         if (rc != 0)
1671                 ns->ln_flags |= LF_INCONSISTENT;
1672
1673         return rc;
1674 }
1675
1676 /**
1677  * Remove the specified entry from the linkEA.
1678  *
1679  * Locate the linkEA entry with the given @cname and @pfid, then
1680  * remove this entry or the other entries those are repeated with
1681  * this entry.
1682  *
1683  * \param[in] env       pointer to the thread context
1684  * \param[in] com       pointer to the lfsck component
1685  * \param[in] obj       pointer to the dt_object to be handled
1686  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
1687  * \param[in] cname     the name for the child in the parent directory
1688  * \param[in] pfid      the parent directory's FID for the linkEA
1689  * \param[in] next      if true, then remove the first found linkEA
1690  *                      entry, and move the ldata->ld_lee to next entry
1691  *
1692  * \retval              positive number for repaired cases
1693  * \retval              0 if nothing to be repaired
1694  * \retval              negative error number on failure
1695  */
1696 static int lfsck_namespace_shrink_linkea(const struct lu_env *env,
1697                                          struct lfsck_component *com,
1698                                          struct dt_object *obj,
1699                                          struct linkea_data *ldata,
1700                                          struct lu_name *cname,
1701                                          struct lu_fid *pfid,
1702                                          bool next)
1703 {
1704         struct lfsck_instance           *lfsck     = com->lc_lfsck;
1705         struct dt_device                *dev       = lfsck_obj2dev(obj);
1706         struct lfsck_bookmark           *bk        = &lfsck->li_bookmark_ram;
1707         struct thandle                  *th        = NULL;
1708         struct lustre_handle             lh        = { 0 };
1709         struct linkea_data               ldata_new = { NULL };
1710         struct lu_buf                    linkea_buf;
1711         int                              buflen    = 0;
1712         int                              rc        = 0;
1713         ENTRY;
1714
1715         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
1716                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
1717                               LCK_EX);
1718         if (rc != 0)
1719                 GOTO(log, rc);
1720
1721         if (next)
1722                 lfsck_linkea_del_buf(ldata, cname);
1723         else
1724                 lfsck_namespace_filter_linkea_entry(ldata, cname, pfid,
1725                                                     true);
1726         if (ldata->ld_leh->leh_reccount > 0 ||
1727             unlikely(ldata->ld_leh->leh_overflow_time)) {
1728                 lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
1729                                ldata->ld_leh->leh_len);
1730                 buflen = linkea_buf.lb_len;
1731         }
1732
1733 again:
1734         th = lfsck_trans_create(env, dev, lfsck);
1735         if (IS_ERR(th))
1736                 GOTO(unlock1, rc = PTR_ERR(th));
1737
1738         if (buflen != 0)
1739                 rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1740                                           XATTR_NAME_LINK, 0, th);
1741         else
1742                 rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, th);
1743         if (rc != 0)
1744                 GOTO(stop, rc);
1745
1746         rc = dt_trans_start_local(env, dev, th);
1747         if (rc != 0)
1748                 GOTO(stop, rc);
1749
1750         dt_write_lock(env, obj, 0);
1751         if (unlikely(lfsck_is_dead_obj(obj)))
1752                 GOTO(unlock2, rc = -ENOENT);
1753
1754         rc = lfsck_links_read2_with_rec(env, obj, &ldata_new);
1755         if (rc)
1756                 GOTO(unlock2, rc = (rc == -ENODATA ? 0 : rc));
1757
1758         /* The specified linkEA entry has been removed by race. */
1759         rc = linkea_links_find(&ldata_new, cname, pfid);
1760         if (rc != 0)
1761                 GOTO(unlock2, rc = 0);
1762
1763         if (bk->lb_param & LPF_DRYRUN)
1764                 GOTO(unlock2, rc = 1);
1765
1766         if (next)
1767                 lfsck_linkea_del_buf(&ldata_new, cname);
1768         else
1769                 lfsck_namespace_filter_linkea_entry(&ldata_new, cname, pfid,
1770                                                     true);
1771
1772         /*
1773          * linkea may change because it doesn't take lock in the first read, if
1774          * it becomes larger, restart from beginning.
1775          */
1776         if ((ldata_new.ld_leh->leh_reccount > 0 ||
1777              unlikely(ldata_new.ld_leh->leh_overflow_time)) &&
1778             buflen < ldata_new.ld_leh->leh_len) {
1779                 dt_write_unlock(env, obj);
1780                 dt_trans_stop(env, dev, th);
1781                 lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
1782                                ldata_new.ld_leh->leh_len);
1783                 buflen = linkea_buf.lb_len;
1784                 goto again;
1785         }
1786
1787         if (buflen)
1788                 rc = lfsck_links_write(env, obj, &ldata_new, th);
1789         else
1790                 rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, th);
1791
1792         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
1793
1794 unlock2:
1795         dt_write_unlock(env, obj);
1796
1797 stop:
1798         dt_trans_stop(env, dev, th);
1799
1800 unlock1:
1801         lfsck_ibits_unlock(&lh, LCK_EX);
1802
1803 log:
1804         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove %s linkEA entry "
1805                "for the object: "DFID", parent "DFID", name %.*s\n",
1806                lfsck_lfsck2name(lfsck), next ? "invalid" : "redundant",
1807                PFID(lfsck_dto2fid(obj)), PFID(pfid), cname->ln_namelen,
1808                cname->ln_name);
1809
1810         if (rc != 0) {
1811                 struct lfsck_namespace *ns = com->lc_file_ram;
1812
1813                 ns->ln_flags |= LF_INCONSISTENT;
1814         }
1815
1816         return rc;
1817 }
1818
1819 /**
1820  * Conditionally remove the specified entry from the linkEA.
1821  *
1822  * Take the parent lock firstly, then check whether the specified
1823  * name entry exists or not: if yes, do nothing; otherwise, call
1824  * lfsck_namespace_shrink_linkea() to remove the linkea entry.
1825  *
1826  * \param[in] env       pointer to the thread context
1827  * \param[in] com       pointer to the lfsck component
1828  * \param[in] parent    pointer to the parent directory
1829  * \param[in] child     pointer to the child object that holds the linkEA
1830  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
1831  * \param[in] cname     the name for the child in the parent directory
1832  * \param[in] pfid      the parent directory's FID for the linkEA
1833  *
1834  * \retval              positive number for repaired cases
1835  * \retval              0 if nothing to be repaired
1836  * \retval              negative error number on failure
1837  */
1838 static int lfsck_namespace_shrink_linkea_cond(const struct lu_env *env,
1839                                               struct lfsck_component *com,
1840                                               struct dt_object *parent,
1841                                               struct dt_object *child,
1842                                               struct linkea_data *ldata,
1843                                               struct lu_name *cname,
1844                                               struct lu_fid *pfid)
1845 {
1846         struct lfsck_thread_info *info  = lfsck_env_info(env);
1847         struct lu_fid            *cfid  = &info->lti_fid3;
1848         struct lfsck_lock_handle *llh   = &info->lti_llh;
1849         int                       rc;
1850         ENTRY;
1851
1852         rc = lfsck_lock(env, com->lc_lfsck, parent, cname->ln_name, llh,
1853                         MDS_INODELOCK_UPDATE, LCK_PR);
1854         if (rc != 0)
1855                 RETURN(rc);
1856
1857         dt_read_lock(env, parent, 0);
1858         if (unlikely(lfsck_is_dead_obj(parent))) {
1859                 dt_read_unlock(env, parent);
1860                 lfsck_unlock(llh);
1861                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1862                                                    cname, pfid, true);
1863
1864                 RETURN(rc);
1865         }
1866
1867         rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
1868                        (const struct dt_key *)cname->ln_name);
1869         dt_read_unlock(env, parent);
1870
1871         /* It is safe to release the ldlm lock, because when the logic come
1872          * here, we have got all the needed information above whether the
1873          * linkEA entry is valid or not. It is not important that others
1874          * may add new linkEA entry after the ldlm lock released. If other
1875          * has removed the specified linkEA entry by race, then it is OK,
1876          * because the subsequent lfsck_namespace_shrink_linkea() can handle
1877          * such case. */
1878         lfsck_unlock(llh);
1879         if (rc == -ENOENT) {
1880                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1881                                                    cname, pfid, true);
1882
1883                 RETURN(rc);
1884         }
1885
1886         if (rc != 0)
1887                 RETURN(rc);
1888
1889         /* The LFSCK just found some internal status of cross-MDTs
1890          * create operation. That is normal. */
1891         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
1892                 linkea_next_entry(ldata);
1893
1894                 RETURN(0);
1895         }
1896
1897         rc = lfsck_namespace_shrink_linkea(env, com, child, ldata, cname,
1898                                            pfid, true);
1899
1900         RETURN(rc);
1901 }
1902
1903 /**
1904  * Conditionally replace name entry in the parent.
1905  *
1906  * As required, the LFSCK may re-create the lost MDT-object for dangling
1907  * name entry, but such repairing may be wrong because of bad FID in the
1908  * name entry. As the LFSCK processing, the real MDT-object may be found,
1909  * then the LFSCK should check whether the former re-created MDT-object
1910  * has been modified or not, if not, then destroy it and update the name
1911  * entry in the parent to reference the real MDT-object.
1912  *
1913  * \param[in] env       pointer to the thread context
1914  * \param[in] com       pointer to the lfsck component
1915  * \param[in] parent    pointer to the parent directory
1916  * \param[in] child     pointer to the MDT-object that may be the real
1917  *                      MDT-object corresponding to the name entry in parent
1918  * \param[in] cfid      the current FID in the name entry
1919  * \param[in] cname     contains the name of the child in the parent directory
1920  *
1921  * \retval              positive number for repaired cases
1922  * \retval              0 if nothing to be repaired
1923  * \retval              negative error number on failure
1924  */
1925 static int lfsck_namespace_replace_cond(const struct lu_env *env,
1926                                         struct lfsck_component *com,
1927                                         struct dt_object *parent,
1928                                         struct dt_object *child,
1929                                         const struct lu_fid *cfid,
1930                                         const struct lu_name *cname)
1931 {
1932         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1933         struct lu_attr                  *la     = &info->lti_la;
1934         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1935         struct lu_fid                    tfid;
1936         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1937         /* The child and its name may be on different MDTs. */
1938         struct dt_device                *dev    = lfsck->li_next;
1939         const char                      *name   = cname->ln_name;
1940         const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
1941         struct dt_object                *cobj   = NULL;
1942         struct lfsck_lock_handle        *pllh   = &info->lti_llh;
1943         struct lustre_handle             clh    = { 0 };
1944         struct linkea_data               ldata  = { NULL };
1945         struct thandle                  *th     = NULL;
1946         bool                             exist  = true;
1947         int                              rc     = 0;
1948         ENTRY;
1949
1950         /* @parent/@child may be based on lfsck->li_bottom,
1951          * but here we need the object based on the lfsck->li_next. */
1952
1953         parent = lfsck_object_locate(dev, parent);
1954         if (IS_ERR(parent))
1955                 GOTO(log, rc = PTR_ERR(parent));
1956
1957         if (unlikely(!dt_try_as_dir(env, parent)))
1958                 GOTO(log, rc = -ENOTDIR);
1959
1960         rc = lfsck_lock(env, lfsck, parent, name, pllh,
1961                         MDS_INODELOCK_UPDATE, LCK_PW);
1962         if (rc != 0)
1963                 GOTO(log, rc);
1964
1965         if (!fid_is_sane(cfid)) {
1966                 exist = false;
1967                 goto replace;
1968         }
1969
1970         cobj = lfsck_object_find_by_dev(env, dev, cfid);
1971         if (IS_ERR(cobj)) {
1972                 rc = PTR_ERR(cobj);
1973                 if (rc == -ENOENT) {
1974                         exist = false;
1975                         goto replace;
1976                 }
1977
1978                 GOTO(log, rc);
1979         }
1980
1981         if (!dt_object_exists(cobj)) {
1982                 exist = false;
1983                 goto replace;
1984         }
1985
1986         rc = dt_lookup_dir(env, parent, name, &tfid);
1987         if (rc == -ENOENT) {
1988                 exist = false;
1989                 goto replace;
1990         }
1991
1992         if (rc != 0)
1993                 GOTO(log, rc);
1994
1995         /* Someone changed the name entry, cannot replace it. */
1996         if (!lu_fid_eq(cfid, &tfid))
1997                 GOTO(log, rc = 0);
1998
1999         /* lock the object to be destroyed. */
2000         rc = lfsck_ibits_lock(env, lfsck, cobj, &clh,
2001                               MDS_INODELOCK_UPDATE |
2002                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
2003                               LCK_EX);
2004         if (rc != 0)
2005                 GOTO(log, rc);
2006
2007         if (unlikely(lfsck_is_dead_obj(cobj))) {
2008                 exist = false;
2009                 goto replace;
2010         }
2011
2012         rc = dt_attr_get(env, cobj, la);
2013         if (rc != 0)
2014                 GOTO(log, rc);
2015
2016         /* The object has been modified by other(s), or it is not created by
2017          * LFSCK, the two cases are indistinguishable. So cannot replace it. */
2018         if (la->la_ctime != 0)
2019                 GOTO(log, rc);
2020
2021         if (S_ISREG(la->la_mode)) {
2022                 rc = dt_xattr_get(env, cobj, &LU_BUF_NULL, XATTR_NAME_LOV);
2023                 /* If someone has created related OST-object(s),
2024                  * then keep it. */
2025                 if ((rc > 0) || (rc < 0 && rc != -ENODATA))
2026                         GOTO(log, rc = (rc > 0 ? 0 : rc));
2027         }
2028
2029 replace:
2030         dt_read_lock(env, child, 0);
2031         rc = lfsck_links_read2_with_rec(env, child, &ldata);
2032         dt_read_unlock(env, child);
2033
2034         /* Someone changed the child, no need to replace. */
2035         if (rc == -ENODATA)
2036                 GOTO(log, rc = 0);
2037
2038         if (rc != 0)
2039                 GOTO(log, rc);
2040
2041         rc = linkea_links_find(&ldata, cname, pfid);
2042         /* Someone moved the child, no need to replace. */
2043         if (rc != 0)
2044                 GOTO(log, rc = 0);
2045
2046         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2047                 GOTO(log, rc = 1);
2048
2049         th = lfsck_trans_create(env, dev, lfsck);
2050         if (IS_ERR(th))
2051                 GOTO(log, rc = PTR_ERR(th));
2052
2053         if (exist) {
2054                 rc = dt_declare_destroy(env, cobj, th);
2055                 if (rc != 0)
2056                         GOTO(stop, rc);
2057         }
2058
2059         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
2060         if (rc != 0)
2061                 GOTO(stop, rc);
2062
2063         rec->rec_type = S_IFDIR;
2064         rec->rec_fid = lfsck_dto2fid(child);
2065         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
2066                                (const struct dt_key *)name, th);
2067         if (rc != 0)
2068                 GOTO(stop, rc);
2069
2070         rc = dt_trans_start_local(env, dev, th);
2071         if (rc != 0)
2072                 GOTO(stop, rc);
2073
2074         if (exist) {
2075                 rc = dt_destroy(env, cobj, th);
2076                 if (rc != 0)
2077                         GOTO(stop, rc);
2078         }
2079
2080         /* The old name entry maybe not exist. */
2081         rc = dt_delete(env, parent, (const struct dt_key *)name, th);
2082         if (rc != 0 && rc != -ENOENT)
2083                 GOTO(stop, rc);
2084
2085         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
2086                        (const struct dt_key *)name, th);
2087
2088         GOTO(stop, rc = (rc == 0 ? 1 : rc));
2089
2090 stop:
2091         dt_trans_stop(env, dev, th);
2092
2093 log:
2094         lfsck_ibits_unlock(&clh, LCK_EX);
2095         lfsck_unlock(pllh);
2096
2097         if (cobj != NULL && !IS_ERR(cobj))
2098                 lfsck_object_put(env, cobj);
2099
2100         CDEBUG(D_LFSCK, "%s: namespace LFSCK conditionally destroy the "
2101                "object "DFID" because of conflict with the object "DFID
2102                " under the parent "DFID" with name %s: rc = %d\n",
2103                lfsck_lfsck2name(lfsck), PFID(cfid),
2104                PFID(lfsck_dto2fid(child)), PFID(pfid), name, rc);
2105
2106         return rc;
2107 }
2108
2109 /**
2110  * Overwrite the linkEA for the object with the given ldata.
2111  *
2112  * The caller should take the ldlm lock before the calling.
2113  *
2114  * \param[in] env       pointer to the thread context
2115  * \param[in] com       pointer to the lfsck component
2116  * \param[in] obj       pointer to the dt_object to be handled
2117  * \param[in] ldata     pointer to the new linkEA data
2118  *
2119  * \retval              positive number for repaired cases
2120  * \retval              0 if nothing to be repaired
2121  * \retval              negative error number on failure
2122  */
2123 int lfsck_namespace_rebuild_linkea(const struct lu_env *env,
2124                                    struct lfsck_component *com,
2125                                    struct dt_object *obj,
2126                                    struct linkea_data *ldata)
2127 {
2128         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2129         struct dt_device                *dev    = lfsck_obj2dev(obj);
2130         struct thandle                  *th     = NULL;
2131         struct lu_buf                    linkea_buf;
2132         int                              rc     = 0;
2133         ENTRY;
2134
2135         th = lfsck_trans_create(env, dev, lfsck);
2136         if (IS_ERR(th))
2137                 GOTO(log, rc = PTR_ERR(th));
2138
2139         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
2140                        ldata->ld_leh->leh_len);
2141         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
2142                                   XATTR_NAME_LINK, 0, th);
2143         if (rc != 0)
2144                 GOTO(stop, rc);
2145
2146         rc = dt_trans_start_local(env, dev, th);
2147         if (rc != 0)
2148                 GOTO(stop, rc);
2149
2150         dt_write_lock(env, obj, 0);
2151         if (unlikely(lfsck_is_dead_obj(obj)))
2152                 GOTO(unlock, rc = 0);
2153
2154         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2155                 GOTO(unlock, rc = 1);
2156
2157         rc = dt_xattr_set(env, obj, &linkea_buf,
2158                           XATTR_NAME_LINK, 0, th);
2159
2160         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2161
2162 unlock:
2163         dt_write_unlock(env, obj);
2164
2165 stop:
2166         dt_trans_stop(env, dev, th);
2167
2168 log:
2169         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild linkEA for the "
2170                "object "DFID": rc = %d\n",
2171                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
2172
2173         if (rc != 0) {
2174                 struct lfsck_namespace *ns = com->lc_file_ram;
2175
2176                 ns->ln_flags |= LF_INCONSISTENT;
2177         }
2178
2179         return rc;
2180 }
2181
2182 /**
2183  * Repair invalid name entry.
2184  *
2185  * If the name entry contains invalid information, such as bad file type
2186  * or (and) corrupted object FID, then either remove the name entry or
2187  * udpate the name entry with the given (right) information.
2188  *
2189  * \param[in] env       pointer to the thread context
2190  * \param[in] com       pointer to the lfsck component
2191  * \param[in] parent    pointer to the parent directory
2192  * \param[in] child     pointer to the object referenced by the name entry
2193  * \param[in] name      the old name of the child under the parent directory
2194  * \param[in] name2     the new name of the child under the parent directory
2195  * \param[in] type      the type claimed by the name entry
2196  * \param[in] update    update the name entry if true; otherwise, remove it
2197  * \param[in] dec       decrease the parent nlink count if true
2198  *
2199  * \retval              positive number for repaired successfully
2200  * \retval              0 if nothing to be repaired
2201  * \retval              negative error number on failure
2202  */
2203 int lfsck_namespace_repair_dirent(const struct lu_env *env,
2204                                   struct lfsck_component *com,
2205                                   struct dt_object *parent,
2206                                   struct dt_object *child,
2207                                   const char *name, const char *name2,
2208                                   __u16 type, bool update, bool dec)
2209 {
2210         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2211         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
2212         const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
2213         struct lu_fid                   cfid    = {0};
2214         struct lu_fid                    tfid;
2215         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2216         struct dt_device                *dev    = lfsck->li_next;
2217         struct thandle                  *th     = NULL;
2218         struct lfsck_lock_handle        *llh    = &info->lti_llh;
2219         struct lustre_handle             lh     = { 0 };
2220         int                              rc     = 0;
2221         ENTRY;
2222
2223         if (child)
2224                 cfid = *lfsck_dto2fid(child);
2225         parent = lfsck_object_locate(dev, parent);
2226         if (IS_ERR(parent))
2227                 GOTO(log, rc = PTR_ERR(parent));
2228
2229         if (unlikely(!dt_try_as_dir(env, parent)))
2230                 GOTO(log, rc = -ENOTDIR);
2231
2232         if (!update || strcmp(name, name2) == 0)
2233                 rc = lfsck_lock(env, lfsck, parent, name, llh,
2234                                 MDS_INODELOCK_UPDATE, LCK_PW);
2235         else
2236                 rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
2237                                       MDS_INODELOCK_UPDATE, LCK_PW);
2238         if (rc != 0)
2239                 GOTO(log, rc);
2240
2241         th = lfsck_trans_create(env, dev, lfsck);
2242         if (IS_ERR(th))
2243                 GOTO(unlock1, rc = PTR_ERR(th));
2244
2245         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
2246         if (rc != 0)
2247                 GOTO(stop, rc);
2248
2249         if (update) {
2250                 rec->rec_type = lfsck_object_type(child) & S_IFMT;
2251                 LASSERT(!fid_is_zero(&cfid));
2252                 rec->rec_fid = &cfid;
2253                 rc = dt_declare_insert(env, parent,
2254                                        (const struct dt_rec *)rec,
2255                                        (const struct dt_key *)name2, th);
2256                 if (rc != 0)
2257                         GOTO(stop, rc);
2258         }
2259
2260         if (dec && S_ISDIR(type)) {
2261                 rc = dt_declare_ref_del(env, parent, th);
2262                 if (rc != 0)
2263                         GOTO(stop, rc);
2264         }
2265
2266         rc = dt_trans_start_local(env, dev, th);
2267         if (rc != 0)
2268                 GOTO(stop, rc);
2269
2270
2271         dt_write_lock(env, parent, 0);
2272         rc = dt_lookup_dir(env, dt_object_child(parent), name, &tfid);
2273         /* Someone has removed the bad name entry by race. */
2274         if (rc == -ENOENT)
2275                 GOTO(unlock2, rc = 0);
2276
2277         if (rc != 0)
2278                 GOTO(unlock2, rc);
2279
2280         /* Someone has removed the bad name entry and reused it for other
2281          * object by race. */
2282         if (!lu_fid_eq(&tfid, &cfid))
2283                 GOTO(unlock2, rc = 0);
2284
2285         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2286                 GOTO(unlock2, rc = 1);
2287
2288         rc = dt_delete(env, parent, (const struct dt_key *)name, th);
2289         if (rc != 0)
2290                 GOTO(unlock2, rc);
2291
2292         if (update) {
2293                 rc = dt_insert(env, parent,
2294                                (const struct dt_rec *)rec,
2295                                (const struct dt_key *)name2, th);
2296                 if (rc != 0)
2297                         GOTO(unlock2, rc);
2298         }
2299
2300         if (dec && S_ISDIR(type)) {
2301                 rc = dt_ref_del(env, parent, th);
2302                 if (rc != 0)
2303                         GOTO(unlock2, rc);
2304         }
2305
2306         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
2307
2308 unlock2:
2309         dt_write_unlock(env, parent);
2310
2311 stop:
2312         dt_trans_stop(env, dev, th);
2313
2314         /* We are not sure whether the child will become orphan or not.
2315          * Record it in the LFSCK trace file for further checking in
2316          * the second-stage scanning. */
2317         if (!update && !dec && child && rc == 0)
2318                 lfsck_namespace_trace_update(env, com, &cfid,
2319                                              LNTF_CHECK_LINKEA, true);
2320
2321 unlock1:
2322         /* It is harmless even if unlock the unused lock_handle */
2323         lfsck_ibits_unlock(&lh, LCK_PW);
2324         lfsck_unlock(llh);
2325
2326 log:
2327         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found bad name "
2328                "entry for: parent "DFID", child "DFID", name %s, type "
2329                "in name entry %o, type claimed by child %o. repair it "
2330                "by %s with new name2 %s: rc = %d\n",
2331                lfsck_lfsck2name(lfsck), PFID(pfid), PFID(&cfid),
2332                name, type, update ? lfsck_object_type(child) : 0,
2333                update ? "updating" : "removing", name2, rc);
2334
2335         if (rc != 0) {
2336                 struct lfsck_namespace *ns = com->lc_file_ram;
2337
2338                 ns->ln_flags |= LF_INCONSISTENT;
2339         }
2340
2341         return rc;
2342 }
2343
2344 /**
2345  * Update the ".." name entry for the given object.
2346  *
2347  * The object's ".." is corrupted, this function will update the ".." name
2348  * entry with the given pfid, and the linkEA with the given ldata.
2349  *
2350  * The caller should take the ldlm lock before the calling.
2351  *
2352  * \param[in] env       pointer to the thread context
2353  * \param[in] com       pointer to the lfsck component
2354  * \param[in] obj       pointer to the dt_object to be handled
2355  * \param[in] pfid      the new fid for the object's ".." name entry
2356  * \param[in] cname     the name for the @obj in the parent directory
2357  *
2358  * \retval              positive number for repaired cases
2359  * \retval              0 if nothing to be repaired
2360  * \retval              negative error number on failure
2361  */
2362 static int lfsck_namespace_repair_unmatched_pairs(const struct lu_env *env,
2363                                                   struct lfsck_component *com,
2364                                                   struct dt_object *obj,
2365                                                   const struct lu_fid *pfid,
2366                                                   struct lu_name *cname)
2367 {
2368         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2369         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
2370         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2371         struct dt_device                *dev    = lfsck_obj2dev(obj);
2372         struct thandle                  *th     = NULL;
2373         struct linkea_data               ldata  = { NULL };
2374         struct lu_buf                    linkea_buf;
2375         int                              rc     = 0;
2376         ENTRY;
2377
2378         LASSERT(!dt_object_remote(obj));
2379         LASSERT(S_ISDIR(lfsck_object_type(obj)));
2380
2381         rc = linkea_links_new(&ldata, &info->lti_big_buf, cname, pfid);
2382         if (rc != 0)
2383                 GOTO(log, rc);
2384
2385         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
2386                        ldata.ld_leh->leh_len);
2387
2388         th = lfsck_trans_create(env, dev, lfsck);
2389         if (IS_ERR(th))
2390                 GOTO(log, rc = PTR_ERR(th));
2391
2392         rc = dt_declare_delete(env, obj, (const struct dt_key *)dotdot, th);
2393         if (rc != 0)
2394                 GOTO(stop, rc);
2395
2396         rec->rec_type = S_IFDIR;
2397         rec->rec_fid = pfid;
2398         rc = dt_declare_insert(env, obj, (const struct dt_rec *)rec,
2399                                (const struct dt_key *)dotdot, th);
2400         if (rc != 0)
2401                 GOTO(stop, rc);
2402
2403         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
2404                                   XATTR_NAME_LINK, 0, th);
2405         if (rc != 0)
2406                 GOTO(stop, rc);
2407
2408         rc = dt_trans_start_local(env, dev, th);
2409         if (rc != 0)
2410                 GOTO(stop, rc);
2411
2412         dt_write_lock(env, obj, 0);
2413         if (unlikely(lfsck_is_dead_obj(obj)))
2414                 GOTO(unlock, rc = 0);
2415
2416         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2417                 GOTO(unlock, rc = 1);
2418
2419         /* The old ".." name entry maybe not exist. */
2420         dt_delete(env, obj, (const struct dt_key *)dotdot, th);
2421
2422         rc = dt_insert(env, obj, (const struct dt_rec *)rec,
2423                        (const struct dt_key *)dotdot, th);
2424         if (rc != 0)
2425                 GOTO(unlock, rc);
2426
2427         rc = lfsck_links_write(env, obj, &ldata, th);
2428
2429         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2430
2431 unlock:
2432         dt_write_unlock(env, obj);
2433
2434 stop:
2435         dt_trans_stop(env, dev, th);
2436
2437 log:
2438         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild dotdot name entry for "
2439                "the object "DFID", new parent "DFID": rc = %d\n",
2440                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)),
2441                PFID(pfid), rc);
2442
2443         if (rc != 0) {
2444                 struct lfsck_namespace *ns = com->lc_file_ram;
2445
2446                 ns->ln_flags |= LF_INCONSISTENT;
2447         }
2448
2449         return rc;
2450 }
2451
2452 /**
2453  * Handle orphan @obj during Double Scan Directory.
2454  *
2455  * Remove the @obj's current (invalid) linkEA entries, and insert
2456  * it in the directory .lustre/lost+found/MDTxxxx/ with the name:
2457  * ${FID}-${PFID}-D-${conflict_version}
2458  *
2459  * The caller should take the ldlm lock before the calling.
2460  *
2461  * \param[in] env       pointer to the thread context
2462  * \param[in] com       pointer to the lfsck component
2463  * \param[in] obj       pointer to the orphan object to be handled
2464  * \param[in] pfid      the new fid for the object's ".." name entry
2465  * \param[in,out] lh    ldlm lock handler for the given @obj
2466  * \param[out] type     to tell the caller what the inconsistency is
2467  *
2468  * \retval              positive number for repaired cases
2469  * \retval              0 if nothing to be repaired
2470  * \retval              negative error number on failure
2471  */
2472 static int
2473 lfsck_namespace_dsd_orphan(const struct lu_env *env,
2474                            struct lfsck_component *com,
2475                            struct dt_object *obj,
2476                            const struct lu_fid *pfid,
2477                            struct lustre_handle *lh,
2478                            enum lfsck_namespace_inconsistency_type *type)
2479 {
2480         struct lfsck_thread_info *info = lfsck_env_info(env);
2481         struct lfsck_namespace   *ns   = com->lc_file_ram;
2482         int                       rc;
2483         ENTRY;
2484
2485         /* Remove the unrecognized linkEA. */
2486         rc = lfsck_namespace_links_remove(env, com, obj);
2487         lfsck_ibits_unlock(lh, LCK_EX);
2488         if (rc < 0 && rc != -ENODATA)
2489                 RETURN(rc);
2490
2491         *type = LNIT_MUL_REF;
2492
2493         /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT has
2494          * ever tried to verify some remote MDT-object that resides on this
2495          * MDT, but this MDT failed to respond such request. So means there
2496          * may be some remote name entry on other MDT that references this
2497          * object with another name, so we cannot know whether this linkEA
2498          * is valid or not. So keep it there and maybe resolved when next
2499          * LFSCK run. */
2500         if (ns->ln_flags & LF_INCOMPLETE)
2501                 RETURN(0);
2502
2503         /* The unique linkEA is invalid, even if the ".." name entry may be
2504          * valid, we still cannot know via which name entry this directory
2505          * will be referenced. Then handle it as pure orphan. */
2506         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2507                  "-"DFID, PFID(pfid));
2508         rc = lfsck_namespace_insert_orphan(env, com, obj,
2509                                            info->lti_tmpbuf, "D", NULL);
2510
2511         RETURN(rc);
2512 }
2513
2514 /**
2515  * Double Scan Directory object for single linkEA entry case.
2516  *
2517  * The given @child has unique linkEA entry. If the linkEA entry is valid,
2518  * then check whether the name is in the namespace or not, if not, add the
2519  * missing name entry back to namespace. If the linkEA entry is invalid,
2520  * then remove it and insert the @child in the .lustre/lost+found/MDTxxxx/
2521  * as an orphan.
2522  *
2523  * \param[in] env       pointer to the thread context
2524  * \param[in] com       pointer to the lfsck component
2525  * \param[in] child     pointer to the directory to be double scanned
2526  * \param[in] pfid      the FID corresponding to the ".." entry
2527  * \param[in] ldata     pointer to the linkEA data for the given @child
2528  * \param[in,out] lh    ldlm lock handler for the given @child
2529  * \param[out] type     to tell the caller what the inconsistency is
2530  * \param[in] retry     if found inconsistency, but the caller does not hold
2531  *                      ldlm lock on the @child, then set @retry as true
2532  * \param[in] unknown   set if does not know how to repair the inconsistency
2533  *
2534  * \retval              positive number for repaired cases
2535  * \retval              0 if nothing to be repaired
2536  * \retval              negative error number on failure
2537  */
2538 static int
2539 lfsck_namespace_dsd_single(const struct lu_env *env,
2540                            struct lfsck_component *com,
2541                            struct dt_object *child,
2542                            const struct lu_fid *pfid,
2543                            struct linkea_data *ldata,
2544                            struct lustre_handle *lh,
2545                            enum lfsck_namespace_inconsistency_type *type,
2546                            bool *retry, bool *unknown)
2547 {
2548         struct lfsck_thread_info *info          = lfsck_env_info(env);
2549         struct lu_name           *cname         = &info->lti_name;
2550         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2551         struct lu_fid             tfid;
2552         struct lfsck_namespace   *ns            = com->lc_file_ram;
2553         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2554         struct dt_object         *parent        = NULL;
2555         struct lmv_mds_md_v1     *lmv;
2556         int                       rc            = 0;
2557         ENTRY;
2558
2559         rc = lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid,
2560                                                  info->lti_key,
2561                                                  sizeof(info->lti_key));
2562         /* The unique linkEA entry with bad parent will be handled as orphan. */
2563         if (rc != 0) {
2564                 if (!lustre_handle_is_used(lh) && retry != NULL)
2565                         *retry = true;
2566                 else
2567                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2568                                                         pfid, lh, type);
2569
2570                 GOTO(out, rc);
2571         }
2572
2573         parent = lfsck_object_find_bottom(env, lfsck, &tfid);
2574         if (IS_ERR(parent))
2575                 GOTO(out, rc = PTR_ERR(parent));
2576
2577         /* We trust the unique linkEA entry in spite of whether it matches the
2578          * ".." name entry or not. Because even if the linkEA entry is wrong
2579          * and the ".." name entry is right, we still cannot know via which
2580          * name entry the child will be referenced, since all known entries
2581          * have been verified during the first-stage scanning. */
2582         if (!dt_object_exists(parent)) {
2583                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT
2584                  * has ever tried to verify some remote MDT-object that resides
2585                  * on this MDT, but this MDT failed to respond such request. So
2586                  * means there may be some remote name entry on other MDT that
2587                  * references this object with another name, so we cannot know
2588                  * whether this linkEA is valid or not. So keep it there and
2589                  * maybe resolved when next LFSCK run. */
2590                 if (ns->ln_flags & LF_INCOMPLETE)
2591                         GOTO(out, rc = 0);
2592
2593                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2594                         *retry = true;
2595
2596                         GOTO(out, rc = 0);
2597                 }
2598
2599                 lfsck_ibits_unlock(lh, LCK_EX);
2600
2601 lost_parent:
2602                 lmv = &info->lti_lmv;
2603                 rc = lfsck_read_stripe_lmv(env, lfsck, child, lmv);
2604                 if (rc != 0 && rc != -ENODATA)
2605                         GOTO(out, rc);
2606
2607                 if (rc == -ENODATA || lmv->lmv_magic != LMV_MAGIC_STRIPE) {
2608                         lmv = NULL;
2609                 } else if (lfsck_shard_name_to_index(env,
2610                                         cname->ln_name, cname->ln_namelen,
2611                                         S_IFDIR, cfid) < 0) {
2612                         /* It is an invalid name entry, we
2613                          * cannot trust the parent also. */
2614                         rc = lfsck_namespace_shrink_linkea(env, com, child,
2615                                                 ldata, cname, &tfid, true);
2616                         if (rc < 0)
2617                                 GOTO(out, rc);
2618
2619                         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2620                                  "-"DFID, PFID(pfid));
2621                         rc = lfsck_namespace_insert_orphan(env, com, child,
2622                                                 info->lti_tmpbuf, "S", NULL);
2623
2624                         GOTO(out, rc);
2625                 }
2626
2627                 /* Create the lost parent as an orphan. */
2628                 rc = lfsck_namespace_create_orphan_dir(env, com, parent, lmv);
2629                 if (rc >= 0) {
2630                         /* Add the missing name entry to the parent. */
2631                         rc = lfsck_namespace_insert_normal(env, com, parent,
2632                                                            child, cname);
2633                         if (unlikely(rc == -EEXIST)) {
2634                                 /* Unfortunately, someone reused the name
2635                                  * under the parent by race. So we have
2636                                  * to remove the linkEA entry from
2637                                  * current child object. It means that the
2638                                  * LFSCK cannot recover the system
2639                                  * totally back to its original status,
2640                                  * but it is necessary to make the
2641                                  * current system to be consistent. */
2642                                 rc = lfsck_namespace_shrink_linkea(env,
2643                                                 com, child, ldata,
2644                                                 cname, &tfid, true);
2645                                 if (rc >= 0) {
2646                                         snprintf(info->lti_tmpbuf,
2647                                                  sizeof(info->lti_tmpbuf),
2648                                                  "-"DFID, PFID(pfid));
2649                                         rc = lfsck_namespace_insert_orphan(env,
2650                                                 com, child, info->lti_tmpbuf,
2651                                                 "D", NULL);
2652                                 }
2653                         }
2654                 }
2655
2656                 GOTO(out, rc);
2657         } /* !dt_object_exists(parent) */
2658
2659         /* The unique linkEA entry with bad parent will be handled as orphan. */
2660         if (unlikely(!dt_try_as_dir(env, parent))) {
2661                 if (!lustre_handle_is_used(lh) && retry != NULL)
2662                         *retry = true;
2663                 else
2664                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2665                                                         pfid, lh, type);
2666
2667                 GOTO(out, rc);
2668         }
2669
2670         rc = dt_lookup_dir(env, parent, cname->ln_name, &tfid);
2671         if (rc == -ENOENT) {
2672                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT
2673                  * has ever tried to verify some remote MDT-object that resides
2674                  * on this MDT, but this MDT failed to respond such request. So
2675                  * means there may be some remote name entry on other MDT that
2676                  * references this object with another name, so we cannot know
2677                  * whether this linkEA is valid or not. So keep it there and
2678                  * maybe resolved when next LFSCK run. */
2679                 if (ns->ln_flags & LF_INCOMPLETE)
2680                         GOTO(out, rc = 0);
2681
2682                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2683                         *retry = true;
2684
2685                         GOTO(out, rc = 0);
2686                 }
2687
2688                 lfsck_ibits_unlock(lh, LCK_EX);
2689                 rc = lfsck_namespace_check_name(env, lfsck, parent, child,
2690                                                 cname);
2691                 if (rc == -ENOENT)
2692                         goto lost_parent;
2693
2694                 if (rc < 0)
2695                         GOTO(out, rc);
2696
2697                 /* It is an invalid name entry, drop it. */
2698                 if (unlikely(rc > 0)) {
2699                         rc = lfsck_namespace_shrink_linkea(env, com, child,
2700                                                 ldata, cname, &tfid, true);
2701                         if (rc >= 0) {
2702                                 snprintf(info->lti_tmpbuf,
2703                                          sizeof(info->lti_tmpbuf),
2704                                          "-"DFID, PFID(pfid));
2705                                 rc = lfsck_namespace_insert_orphan(env, com,
2706                                         child, info->lti_tmpbuf, "D", NULL);
2707                         }
2708
2709                         GOTO(out, rc);
2710                 }
2711
2712                 /* Add the missing name entry back to the namespace. */
2713                 rc = lfsck_namespace_insert_normal(env, com, parent, child,
2714                                                    cname);
2715                 if (unlikely(rc == -ESTALE))
2716                         /* It may happen when the remote object has been
2717                          * removed, but the local MDT is not aware of that. */
2718                         goto lost_parent;
2719
2720                 if (unlikely(rc == -EEXIST)) {
2721                         /* Unfortunately, someone reused the name under the
2722                          * parent by race. So we have to remove the linkEA
2723                          * entry from current child object. It means that the
2724                          * LFSCK cannot recover the system totally back to
2725                          * its original status, but it is necessary to make
2726                          * the current system to be consistent.
2727                          *
2728                          * It also may be because of the LFSCK found some
2729                          * internal status of create operation. Under such
2730                          * case, nothing to be done. */
2731                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
2732                                         parent, child, ldata, cname, &tfid);
2733                         if (rc >= 0) {
2734                                 snprintf(info->lti_tmpbuf,
2735                                          sizeof(info->lti_tmpbuf),
2736                                          "-"DFID, PFID(pfid));
2737                                 rc = lfsck_namespace_insert_orphan(env, com,
2738                                         child, info->lti_tmpbuf, "D", NULL);
2739                         }
2740                 }
2741
2742                 GOTO(out, rc);
2743         } /* rc == -ENOENT */
2744
2745         if (rc != 0)
2746                 GOTO(out, rc);
2747
2748         if (!lu_fid_eq(&tfid, cfid)) {
2749                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2750                         *retry = true;
2751
2752                         GOTO(out, rc = 0);
2753                 }
2754
2755                 lfsck_ibits_unlock(lh, LCK_EX);
2756                 /* The name entry references another MDT-object that
2757                  * may be created by the LFSCK for repairing dangling
2758                  * name entry. Try to replace it. */
2759                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
2760                                                   &tfid, cname);
2761                 if (rc == 0)
2762                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2763                                                         pfid, lh, type);
2764
2765                 GOTO(out, rc);
2766         }
2767
2768         /* Zero FID may because the remote directroy object has invalid linkEA,
2769          * or lost linkEA. Under such case, the LFSCK on this MDT does not know
2770          * how to repair the inconsistency, but the namespace LFSCK on the MDT
2771          * where its name entry resides may has more information (name, FID) to
2772          * repair such inconsistency. So here, keep the inconsistency to avoid
2773          * some imporper repairing. */
2774         if (fid_is_zero(pfid)) {
2775                 if (unknown)
2776                         *unknown = true;
2777
2778                 GOTO(out, rc = 0);
2779         }
2780
2781         /* The ".." name entry is wrong, update it. */
2782         if (!lu_fid_eq(pfid, lfsck_dto2fid(parent))) {
2783                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2784                         *retry = true;
2785
2786                         GOTO(out, rc = 0);
2787                 }
2788
2789                 *type = LNIT_UNMATCHED_PAIRS;
2790                 rc = lfsck_namespace_repair_unmatched_pairs(env, com, child,
2791                                                 lfsck_dto2fid(parent), cname);
2792         }
2793
2794         GOTO(out, rc);
2795
2796 out:
2797         if (parent != NULL && !IS_ERR(parent))
2798                 lfsck_object_put(env, parent);
2799
2800         return rc;
2801 }
2802
2803 /**
2804  * Double Scan Directory object for multiple linkEA entries case.
2805  *
2806  * The given @child has multiple linkEA entries. There is at most one linkEA
2807  * entry will be valid, all the others will be removed. Firstly, the function
2808  * will try to find out the linkEA entry for which the name entry exists under
2809  * the given parent (@pfid). If there is no linkEA entry that matches the given
2810  * ".." name entry, then tries to find out the first linkEA entry that both the
2811  * parent and the name entry exist to rebuild a new ".." name entry.
2812  *
2813  * \param[in] env       pointer to the thread context
2814  * \param[in] com       pointer to the lfsck component
2815  * \param[in] child     pointer to the directory to be double scanned
2816  * \param[in] pfid      the FID corresponding to the ".." entry
2817  * \param[in] ldata     pointer to the linkEA data for the given @child
2818  * \param[in,out] lh    ldlm lock handler for the given @child
2819  * \param[out] type     to tell the caller what the inconsistency is
2820  * \param[in] lpf       true if the ".." entry is under lost+found/MDTxxxx/
2821  * \param[in] unknown   set if does not know how to repair the inconsistency
2822  *
2823  * \retval              positive number for repaired cases
2824  * \retval              0 if nothing to be repaired
2825  * \retval              negative error number on failure
2826  */
2827 static int
2828 lfsck_namespace_dsd_multiple(const struct lu_env *env,
2829                              struct lfsck_component *com,
2830                              struct dt_object *child,
2831                              const struct lu_fid *pfid,
2832                              struct linkea_data *ldata,
2833                              struct lustre_handle *lh,
2834                              enum lfsck_namespace_inconsistency_type *type,
2835                              bool lpf, bool *unknown)
2836 {
2837         struct lfsck_thread_info *info          = lfsck_env_info(env);
2838         struct lu_name           *cname         = &info->lti_name;
2839         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2840         struct lu_fid            *pfid2         = &info->lti_fid3;
2841         struct lu_fid             tfid;
2842         struct lfsck_namespace   *ns            = com->lc_file_ram;
2843         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2844         struct lfsck_bookmark    *bk            = &lfsck->li_bookmark_ram;
2845         struct dt_object         *parent        = NULL;
2846         struct linkea_data        ldata_new     = { NULL };
2847         int                       dirent_count  = 0;
2848         int                       rc            = 0;
2849         bool                      once          = true;
2850         ENTRY;
2851
2852 again:
2853         while (ldata->ld_lee != NULL) {
2854                 rc = lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid,
2855                                                          info->lti_key,
2856                                                          sizeof(info->lti_key));
2857                 /* Drop invalid linkEA entry. */
2858                 if (rc != 0) {
2859                         lfsck_linkea_del_buf(ldata, cname);
2860                         continue;
2861                 }
2862
2863                 /* Drop repeated linkEA entries. */
2864                 lfsck_namespace_filter_linkea_entry(ldata, cname, &tfid, true);
2865
2866                 /* If current dotdot is the .lustre/lost+found/MDTxxxx/,
2867                  * then it is possible that: the directry object has ever
2868                  * been lost, but its name entry was there. In the former
2869                  * LFSCK run, during the first-stage scanning, the LFSCK
2870                  * found the dangling name entry, but it did not recreate
2871                  * the lost object, and when moved to the second-stage
2872                  * scanning, some children objects of the lost directory
2873                  * object were found, then the LFSCK recreated such lost
2874                  * directory object as an orphan.
2875                  *
2876                  * When the LFSCK runs again, if the dangling name is still
2877                  * there, the LFSCK should move the orphan directory object
2878                  * back to the normal namespace. */
2879                 if (!lpf && !fid_is_zero(pfid) &&
2880                     !lu_fid_eq(pfid, &tfid) && once) {
2881                         linkea_next_entry(ldata);
2882                         continue;
2883                 }
2884
2885                 parent = lfsck_object_find_bottom(env, lfsck, &tfid);
2886                 if (IS_ERR(parent)) {
2887                         rc = PTR_ERR(parent);
2888                         /* if @pfid doesn't have a valid OI mapping, it will
2889                          * trigger OI scrub, and -ENONET is is returned if it's
2890                          * remote, -EINPROGRESS if local.
2891                          */
2892                         if ((rc == -ENOENT || rc == -EINPROGRESS) &&
2893                             ldata->ld_leh->leh_reccount > 1) {
2894                                 lfsck_linkea_del_buf(ldata, cname);
2895                                 continue;
2896                         }
2897
2898                         RETURN(rc);
2899                 }
2900
2901                 if (!dt_object_exists(parent)) {
2902                         lfsck_object_put(env, parent);
2903                         if (ldata->ld_leh->leh_reccount > 1) {
2904                                 /* If it is NOT the last linkEA entry, then
2905                                  * there is still other chance to make the
2906                                  * child to be visible via other parent, then
2907                                  * remove this linkEA entry. */
2908                                 lfsck_linkea_del_buf(ldata, cname);
2909                                 continue;
2910                         }
2911
2912                         break;
2913                 }
2914
2915                 /* The linkEA entry with bad parent will be removed. */
2916                 if (unlikely(!dt_try_as_dir(env, parent))) {
2917                         lfsck_object_put(env, parent);
2918                         lfsck_linkea_del_buf(ldata, cname);
2919                         continue;
2920                 }
2921
2922                 rc = dt_lookup_dir(env, parent, cname->ln_name, &tfid);
2923                 *pfid2 = *lfsck_dto2fid(parent);
2924                 if (rc == -ENOENT) {
2925                         lfsck_object_put(env, parent);
2926                         linkea_next_entry(ldata);
2927                         continue;
2928                 }
2929
2930                 if (rc != 0) {
2931                         lfsck_object_put(env, parent);
2932
2933                         RETURN(rc);
2934                 }
2935
2936                 if (lu_fid_eq(&tfid, cfid)) {
2937                         lfsck_object_put(env, parent);
2938                         /* If the parent (that is declared via linkEA entry)
2939                          * directory contains the specified child, but such
2940                          * parent does not match the dotdot name entry, then
2941                          * trust the linkEA. */
2942                         if (!fid_is_zero(pfid) && !lu_fid_eq(pfid, pfid2)) {
2943                                 *type = LNIT_UNMATCHED_PAIRS;
2944                                 rc = lfsck_namespace_repair_unmatched_pairs(env,
2945                                                 com, child, pfid2, cname);
2946
2947                                 RETURN(rc);
2948                         }
2949
2950 rebuild:
2951                         /* It is the most common case that we find the
2952                          * name entry corresponding to the linkEA entry
2953                          * that matches the ".." name entry. */
2954                         rc = linkea_links_new(&ldata_new, &info->lti_big_buf,
2955                                               cname, pfid2);
2956                         if (rc != 0)
2957                                 RETURN(rc);
2958
2959                         rc = lfsck_namespace_rebuild_linkea(env, com, child,
2960                                                             &ldata_new);
2961                         if (rc < 0)
2962                                 RETURN(rc);
2963
2964                         lfsck_linkea_del_buf(ldata, cname);
2965                         linkea_first_entry(ldata);
2966                         /* There may be some invalid dangling name entries under
2967                          * other parent directories, remove all of them. */
2968                         while (ldata->ld_lee != NULL) {
2969                                 rc = lfsck_namespace_unpack_linkea_entry(ldata,
2970                                                 cname, &tfid, info->lti_key,
2971                                                 sizeof(info->lti_key));
2972                                 if (rc != 0)
2973                                         goto next;
2974
2975                                 parent = lfsck_object_find_bottom(env, lfsck,
2976                                                                   &tfid);
2977                                 if (IS_ERR(parent)) {
2978                                         rc = PTR_ERR(parent);
2979                                         if (rc != -ENOENT &&
2980                                             bk->lb_param & LPF_FAILOUT)
2981                                                 RETURN(rc);
2982
2983                                         goto next;
2984                                 }
2985
2986                                 if (!dt_object_exists(parent)) {
2987                                         lfsck_object_put(env, parent);
2988                                         goto next;
2989                                 }
2990
2991                                 rc = lfsck_namespace_repair_dirent(env, com,
2992                                         parent, child, cname->ln_name,
2993                                         cname->ln_name, S_IFDIR, false, true);
2994                                 lfsck_object_put(env, parent);
2995                                 if (rc < 0) {
2996                                         if (bk->lb_param & LPF_FAILOUT)
2997                                                 RETURN(rc);
2998
2999                                         goto next;
3000                                 }
3001
3002                                 dirent_count += rc;
3003
3004 next:
3005                                 lfsck_linkea_del_buf(ldata, cname);
3006                         }
3007
3008                         ns->ln_dirent_repaired += dirent_count;
3009
3010                         RETURN(rc);
3011                 } /* lu_fid_eq(&tfid, lfsck_dto2fid(child)) */
3012
3013                 lfsck_ibits_unlock(lh, LCK_EX);
3014                 /* The name entry references another MDT-object that may be
3015                  * created by the LFSCK for repairing dangling name entry.
3016                  * Try to replace it. */
3017                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
3018                                                   &tfid, cname);
3019                 lfsck_object_put(env, parent);
3020                 if (rc < 0)
3021                         RETURN(rc);
3022
3023                 if (rc > 0)
3024                         goto rebuild;
3025
3026                 lfsck_linkea_del_buf(ldata, cname);
3027         } /* while (ldata->ld_lee != NULL) */
3028
3029         /* If there is still linkEA overflow, return. */
3030         if (unlikely(ldata->ld_leh->leh_overflow_time))
3031                 RETURN(0);
3032
3033         linkea_first_entry(ldata);
3034         if (ldata->ld_leh->leh_reccount == 1) {
3035                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, ldata,
3036                                                 lh, type, NULL, unknown);
3037
3038                 RETURN(rc);
3039         }
3040
3041         /* All linkEA entries are invalid and removed, then handle the @child
3042          * as an orphan.*/
3043         if (ldata->ld_leh->leh_reccount == 0) {
3044                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, lh,
3045                                                 type);
3046
3047                 RETURN(rc);
3048         }
3049
3050         /* If the dangling name entry for the orphan directory object has
3051          * been remvoed, then just check whether the directory object is
3052          * still under the .lustre/lost+found/MDTxxxx/ or not. */
3053         if (lpf) {
3054                 lpf = false;
3055                 goto again;
3056         }
3057
3058         /* There is no linkEA entry that matches the ".." name entry. Find
3059          * the first linkEA entry that both parent and name entry exist to
3060          * rebuild a new ".." name entry. */
3061         if (once) {
3062                 once = false;
3063                 goto again;
3064         }
3065
3066         RETURN(rc);
3067 }
3068
3069 /**
3070  * Repair the object's nlink attribute.
3071  *
3072  * If all the known name entries have been verified, then the object's hard
3073  * link attribute should match the object's linkEA entries count unless the
3074  * object's has too many hard link to be recorded in the linkEA. Such cases
3075  * should have been marked in the LFSCK trace file. Otherwise, trust the
3076  * linkEA to update the object's nlink attribute.
3077  *
3078  * \param[in] env       pointer to the thread context
3079  * \param[in] com       pointer to the lfsck component
3080  * \param[in] obj       pointer to the dt_object to be handled
3081  * \param[in,out] la    pointer to buffer to object's attribute before
3082  *                      and after the repairing
3083  *
3084  * \retval              positive number for repaired cases
3085  * \retval              0 if nothing to be repaired
3086  * \retval              negative error number on failure
3087  */
3088 static int lfsck_namespace_repair_nlink(const struct lu_env *env,
3089                                         struct lfsck_component *com,
3090                                         struct dt_object *obj,
3091                                         struct lu_attr *la)
3092 {
3093         struct lfsck_namespace          *ns     = com->lc_file_ram;
3094         struct lfsck_instance           *lfsck  = com->lc_lfsck;
3095         struct dt_device                *dev    = lfsck_obj2dev(obj);
3096         const struct lu_fid             *cfid   = lfsck_dto2fid(obj);
3097         struct thandle                  *th     = NULL;
3098         struct linkea_data               ldata  = { NULL };
3099         struct lustre_handle             lh     = { 0 };
3100         __u32                            old    = la->la_nlink;
3101         int                              rc     = 0;
3102         ENTRY;
3103
3104         LASSERT(!dt_object_remote(obj));
3105
3106         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
3107                               MDS_INODELOCK_UPDATE, LCK_PW);
3108         if (rc != 0)
3109                 GOTO(log, rc);
3110
3111         th = lfsck_trans_create(env, dev, lfsck);
3112         if (IS_ERR(th))
3113                 GOTO(log, rc = PTR_ERR(th));
3114
3115         la->la_valid = LA_NLINK;
3116         rc = dt_declare_attr_set(env, obj, la, th);
3117         if (rc != 0)
3118                 GOTO(stop, rc);
3119
3120         rc = dt_trans_start_local(env, dev, th);
3121         if (rc != 0)
3122                 GOTO(stop, rc);
3123
3124         dt_write_lock(env, obj, 0);
3125         /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT has
3126          * ever tried to verify some remote MDT-object that resides on this
3127          * MDT, but this MDT failed to respond such request. So means there
3128          * may be some remote name entry on other MDT that references this
3129          * object with another name, so we cannot know whether this linkEA
3130          * is valid or not. So keep it there and maybe resolved when next
3131          * LFSCK run. */
3132         if (ns->ln_flags & LF_INCOMPLETE)
3133                 GOTO(unlock, rc = 0);
3134
3135         rc = dt_attr_get(env, obj, la);
3136         if (rc != 0)
3137                 GOTO(unlock, rc = (rc == -ENOENT ? 0 : rc));
3138
3139         rc = lfsck_links_read2_with_rec(env, obj, &ldata);
3140         if (rc)
3141                 GOTO(unlock, rc = (rc == -ENODATA ? 0 : rc));
3142
3143         /* XXX: Currently, we only update the nlink attribute if the known
3144          *      linkEA entries is larger than the nlink attribute. That is
3145          *      safe action. */
3146         if (la->la_nlink >= ldata.ld_leh->leh_reccount ||
3147             unlikely(la->la_nlink == 0 ||
3148                      ldata.ld_leh->leh_overflow_time))
3149                 GOTO(unlock, rc = 0);
3150
3151         la->la_nlink = ldata.ld_leh->leh_reccount;
3152         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
3153                 GOTO(unlock, rc = 1);
3154
3155         rc = dt_attr_set(env, obj, la, th);
3156
3157         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
3158
3159 unlock:
3160         dt_write_unlock(env, obj);
3161
3162 stop:
3163         dt_trans_stop(env, dev, th);
3164
3165 log:
3166         lfsck_ibits_unlock(&lh, LCK_PW);
3167         CDEBUG(D_LFSCK, "%s: namespace LFSCK repaired the object "DFID"'s "
3168                "nlink count from %u to %u: rc = %d\n",
3169                lfsck_lfsck2name(lfsck), PFID(cfid), old, la->la_nlink, rc);
3170
3171         if (rc != 0)
3172                 ns->ln_flags |= LF_INCONSISTENT;
3173
3174         return rc;
3175 }
3176
3177 /**
3178  * Double scan the directory object for namespace LFSCK.
3179  *
3180  * This function will verify the <parent, child> pairs in the namespace tree:
3181  * the parent references the child via some name entry that should be in the
3182  * child's linkEA entry, the child should back references the parent via its
3183  * ".." name entry.
3184  *
3185  * The LFSCK will scan every linkEA entry in turn until find out the first
3186  * matched pairs. If found, then all other linkEA entries will be dropped.
3187  * If all the linkEA entries cannot match the ".." name entry, then there
3188  * are serveral possible cases:
3189  *
3190  * 1) If there is only one linkEA entry, then trust it as long as the PFID
3191  *    in the linkEA entry is valid.
3192  *
3193  * 2) If there are multiple linkEA entries, then try to find the linkEA
3194  *    that matches the ".." name entry. If found, then all other entries
3195  *    are invalid; otherwise, it is quite possible that the ".." name entry
3196  *    is corrupted. Under such case, the LFSCK will rebuild the ".." name
3197  *    entry according to the first valid linkEA entry (both the parent and
3198  *    the name entry should exist).
3199  *
3200  * 3) If the directory object has no (valid) linkEA entry, then the
3201  *    directory object will be handled as pure orphan and inserted
3202  *    in the .lustre/lost+found/MDTxxxx/ with the name:
3203  *    ${self_FID}-${PFID}-D-${conflict_version}
3204  *
3205  * \param[in] env       pointer to the thread context
3206  * \param[in] com       pointer to the lfsck component
3207  * \param[in] child     pointer to the directory object to be handled
3208  * \param[in] flags     to indicate the specical checking on the @child
3209  *
3210  * \retval              positive number for repaired cases
3211  * \retval              0 if nothing to be repaired
3212  * \retval              negative error number on failure
3213  */
3214 static int lfsck_namespace_double_scan_dir(const struct lu_env *env,
3215                                            struct lfsck_component *com,
3216                                            struct dt_object *child, __u8 flags)
3217 {
3218         struct lfsck_thread_info *info          = lfsck_env_info(env);
3219         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
3220         struct lu_fid            *pfid          = &info->lti_fid2;
3221         struct lfsck_namespace   *ns            = com->lc_file_ram;
3222         struct lfsck_instance    *lfsck         = com->lc_lfsck;
3223         struct lustre_handle      lh            = { 0 };
3224         struct linkea_data        ldata         = { NULL };
3225         bool                      unknown       = false;
3226         bool                      lpf           = false;
3227         bool                      retry         = false;
3228         enum lfsck_namespace_inconsistency_type type = LNIT_BAD_LINKEA;
3229         int                       rc            = 0;
3230         ENTRY;
3231
3232         LASSERT(!dt_object_remote(child));
3233
3234         if (flags & LNTF_UNCERTAIN_LMV) {
3235                 if (flags & LNTF_RECHECK_NAME_HASH) {
3236                         rc = lfsck_namespace_scan_shard(env, com, child);
3237                         if (rc < 0)
3238                                 RETURN(rc);
3239
3240                         ns->ln_striped_shards_scanned++;
3241                 } else {
3242                         ns->ln_striped_shards_skipped++;
3243                 }
3244         }
3245
3246         flags &= ~(LNTF_RECHECK_NAME_HASH | LNTF_UNCERTAIN_LMV);
3247         if (flags == 0)
3248                 RETURN(0);
3249
3250         if (flags & (LNTF_CHECK_LINKEA | LNTF_CHECK_PARENT) &&
3251             !(lfsck->li_bookmark_ram.lb_param & LPF_ALL_TGT)) {
3252                 CDEBUG(D_LFSCK,
3253                        "%s: some MDT(s) maybe NOT take part in the the namespace LFSCK, then the LFSCK cannot guarantee all the name entries have been verified in first-stage scanning. So have to skip orphan related handling for the directory object "DFID" with remote name entry\n",
3254                        lfsck_lfsck2name(lfsck), PFID(cfid));
3255
3256                 RETURN(0);
3257         }
3258
3259         if (unlikely(!dt_try_as_dir(env, child)))
3260                 GOTO(out, rc = -ENOTDIR);
3261
3262         /* We only take ldlm lock on the @child when required. When the
3263          * logic comes here for the first time, it is always false. */
3264         if (0) {
3265
3266 lock:
3267                 rc = lfsck_ibits_lock(env, lfsck, child, &lh,
3268                                       MDS_INODELOCK_UPDATE |
3269                                       MDS_INODELOCK_XATTR, LCK_EX);
3270                 if (rc != 0)
3271                         GOTO(out, rc);
3272         }
3273
3274         dt_read_lock(env, child, 0);
3275         if (unlikely(lfsck_is_dead_obj(child))) {
3276                 dt_read_unlock(env, child);
3277
3278                 GOTO(out, rc = 0);
3279         }
3280
3281         rc = dt_lookup_dir(env, child, dotdot, pfid);
3282         if (rc != 0) {
3283                 if (rc != -ENOENT && rc != -ENODATA && rc != -EINVAL) {
3284                         dt_read_unlock(env, child);
3285
3286                         GOTO(out, rc);
3287                 }
3288
3289                 if (!lustre_handle_is_used(&lh)) {
3290                         dt_read_unlock(env, child);
3291                         goto lock;
3292                 }
3293
3294                 fid_zero(pfid);
3295         } else if (lfsck->li_lpf_obj != NULL &&
3296                    lu_fid_eq(pfid, lfsck_dto2fid(lfsck->li_lpf_obj))) {
3297                 lpf = true;
3298         } else if (unlikely(!fid_is_sane(pfid))) {
3299                 fid_zero(pfid);
3300         }
3301
3302         rc = lfsck_links_read(env, child, &ldata);
3303         dt_read_unlock(env, child);
3304         if (rc != 0) {
3305                 if (rc != -ENODATA && rc != -EINVAL)
3306                         GOTO(out, rc);
3307
3308                 if (!lustre_handle_is_used(&lh))
3309                         goto lock;
3310
3311                 if (rc == -EINVAL && !fid_is_zero(pfid)) {
3312                         /* Remove the corrupted linkEA. */
3313                         rc = lfsck_namespace_links_remove(env, com, child);
3314                         if (rc == 0)
3315                                 /* Here, because of the crashed linkEA, we
3316                                  * cannot know whether there is some parent
3317                                  * that references the child directory via
3318                                  * some name entry or not. So keep it there,
3319                                  * when the LFSCK run next time, if there is
3320                                  * some parent that references this object,
3321                                  * then the LFSCK can rebuild the linkEA;
3322                                  * otherwise, this object will be handled
3323                                  * as orphan as above. */
3324                                 unknown = true;
3325                 } else {
3326                         /* 1. If we have neither ".." nor linkEA,
3327                          *    then it is an orphan.
3328                          *
3329                          * 2. If we only have the ".." name entry,
3330                          *    but no parent references this child
3331                          *    directory, then handle it as orphan. */
3332                         lfsck_ibits_unlock(&lh, LCK_EX);
3333                         type = LNIT_MUL_REF;
3334
3335                         /* If the LFSCK is marked as LF_INCOMPLETE,
3336                          * then means some MDT has ever tried to
3337                          * verify some remote MDT-object that resides
3338                          * on this MDT, but this MDT failed to respond
3339                          * such request. So means there may be some
3340                          * remote name entry on other MDT that
3341                          * references this object with another name,
3342                          * so we cannot know whether this linkEA is
3343                          * valid or not. So keep it there and maybe
3344                          * resolved when next LFSCK run. */
3345                         if (ns->ln_flags & LF_INCOMPLETE)
3346                                 GOTO(out, rc = 0);
3347
3348                         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
3349                                  "-"DFID, PFID(pfid));
3350                         rc = lfsck_namespace_insert_orphan(env, com, child,
3351                                                 info->lti_tmpbuf, "D", NULL);
3352                 }
3353
3354                 GOTO(out, rc);
3355         } /* rc != 0 */
3356
3357         linkea_first_entry(&ldata);
3358         /* This is the most common case: the object has unique linkEA entry. */
3359         if (ldata.ld_leh->leh_reccount == 1) {
3360                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, &ldata,
3361                                                 &lh, &type, &retry, &unknown);
3362                 if (retry) {
3363                         LASSERT(!lustre_handle_is_used(&lh));
3364
3365                         retry = false;
3366                         goto lock;
3367                 }
3368
3369                 GOTO(out, rc);
3370         }
3371
3372         if (!lustre_handle_is_used(&lh))
3373                 goto lock;
3374
3375         if (unlikely(ldata.ld_leh->leh_reccount == 0)) {
3376                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, &lh,
3377                                                 &type);
3378
3379                 GOTO(out, rc);
3380         }
3381
3382         /* When we come here, the cases usually like that:
3383          * 1) The directory object has a corrupted linkEA entry. During the
3384          *    first-stage scanning, the LFSCK cannot know such corruption,
3385          *    then it appends the right linkEA entry according to the found
3386          *    name entry after the bad one.
3387          *
3388          * 2) The directory object has a right linkEA entry. During the
3389          *    first-stage scanning, the LFSCK finds some bad name entry,
3390          *    but the LFSCK cannot aware that at that time, then it adds
3391          *    the bad linkEA entry for further processing. */
3392         rc = lfsck_namespace_dsd_multiple(env, com, child, pfid, &ldata,
3393                                           &lh, &type, lpf, &unknown);
3394
3395         GOTO(out, rc);
3396
3397 out:
3398         lfsck_ibits_unlock(&lh, LCK_EX);
3399         if (rc > 0) {
3400                 switch (type) {
3401                 case LNIT_BAD_LINKEA:
3402                         ns->ln_linkea_repaired++;
3403                         break;
3404                 case LNIT_UNMATCHED_PAIRS:
3405                         ns->ln_unmatched_pairs_repaired++;
3406                         break;
3407                 case LNIT_MUL_REF:
3408                         ns->ln_mul_ref_repaired++;
3409                         break;
3410                 default:
3411                         break;
3412                 }
3413         }
3414
3415         if (unknown)
3416                 ns->ln_unknown_inconsistency++;
3417
3418         return rc;
3419 }
3420
3421 static inline bool
3422 lfsck_namespace_linkea_stale_overflow(struct linkea_data *ldata,
3423                                       struct lfsck_namespace *ns)
3424 {
3425         /* Both the leh_overflow_time and ln_time_latest_reset are
3426          * local time based, so need NOT to care about clock drift
3427          * among the servers. */
3428         return ldata->ld_leh->leh_overflow_time &&
3429                ldata->ld_leh->leh_overflow_time < ns->ln_time_latest_reset;
3430 }
3431
3432 /**
3433  * Clear the object's linkEA overflow timestamp.
3434  *
3435  * If the MDT-object has too many hard links as to the linkEA cannot hold
3436  * all of them, then overflow timestamp will be set in the linkEA header.
3437  * If some hard links are removed after that, then it is possible to hold
3438  * other missed linkEA entries. If the namespace LFSCK have added all the
3439  * related linkEA entries, then it will remove the overflow timestamp.
3440  *
3441  * \param[in] env       pointer to the thread context
3442  * \param[in] com       pointer to the lfsck component
3443  * \param[in] ldata     pointer to the linkEA data for the given @obj
3444  * \param[in] obj       pointer to the dt_object to be handled
3445  *
3446  * \retval              positive number for repaired cases
3447  * \retval              0 if nothing to be repaired
3448  * \retval              negative error number on failure
3449  */
3450 static int lfsck_namespace_linkea_clear_overflow(const struct lu_env *env,
3451                                                  struct lfsck_component *com,
3452                                                  struct linkea_data *ldata,
3453                                                  struct dt_object *obj)
3454 {
3455         struct lfsck_namespace *ns = com->lc_file_ram;
3456         struct lfsck_instance *lfsck = com->lc_lfsck;
3457         struct dt_device *dev = lfsck_obj2dev(obj);
3458         struct thandle *th = NULL;
3459         struct lustre_handle lh = { 0 };
3460         struct lu_buf linkea_buf;
3461         int rc = 0;
3462         ENTRY;
3463
3464         LASSERT(!dt_object_remote(obj));
3465
3466         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
3467                               MDS_INODELOCK_UPDATE, LCK_PW);
3468         if (rc != 0)
3469                 GOTO(log, rc);
3470
3471         th = lfsck_trans_create(env, dev, lfsck);
3472         if (IS_ERR(th))
3473                 GOTO(log, rc = PTR_ERR(th));
3474
3475         rc = dt_declare_xattr_set(env, obj,
3476                         lfsck_buf_get_const(env, NULL, MAX_LINKEA_SIZE),
3477                         XATTR_NAME_LINK, 0, th);
3478         if (rc != 0)
3479                 GOTO(stop, rc);
3480
3481         rc = dt_trans_start_local(env, dev, th);
3482         if (rc != 0)
3483                 GOTO(stop, rc);
3484
3485         dt_write_lock(env, obj, 0);
3486         rc = lfsck_links_read(env, obj, ldata);
3487         if (rc != 0)
3488                 GOTO(unlock, rc);
3489
3490         if (unlikely(!lfsck_namespace_linkea_stale_overflow(ldata, ns)))
3491                 GOTO(unlock, rc = 0);
3492
3493         ldata->ld_leh->leh_overflow_time = 0;
3494         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
3495                 GOTO(unlock, rc = 1);
3496
3497         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
3498                        ldata->ld_leh->leh_len);
3499         rc = dt_xattr_set(env, obj, &linkea_buf, XATTR_NAME_LINK, 0, th);
3500         if (unlikely(rc == -ENOSPC))
3501                 rc = 0;
3502         else if (!rc)
3503                 rc = 1;
3504
3505         GOTO(unlock, rc);
3506
3507 unlock:
3508         dt_write_unlock(env, obj);
3509
3510 stop:
3511         dt_trans_stop(env, dev, th);
3512
3513 log:
3514         lfsck_ibits_unlock(&lh, LCK_PW);
3515         CDEBUG(D_LFSCK, "%s: clear linkea overflow timestamp for the object "
3516                DFID": rc = %d\n",
3517                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
3518
3519         return rc;
3520 }
3521
3522 /**
3523  * Verify the object's agent entry.
3524  *
3525  * If the object claims to have agent entry but the linkEA does not contain
3526  * remote parent, then remove the agent entry. Otherwise, if the object has
3527  * no agent entry but its linkEA contains remote parent, then will generate
3528  * agent entry for it.
3529  *
3530  * \param[in] env       pointer to the thread context
3531  * \param[in] com       pointer to the lfsck component
3532  * \param[in] obj       pointer to the dt_object to be handled
3533  *
3534  * \retval              positive number for repaired cases
3535  * \retval              0 if nothing to be repaired
3536  * \retval              negative error number on failure
3537  */
3538 static int lfsck_namespace_check_agent_entry(const struct lu_env *env,
3539                                              struct lfsck_component *com,
3540                                              struct dt_object *obj)
3541 {
3542         struct linkea_data ldata = { NULL };
3543         struct lfsck_thread_info *info = lfsck_env_info(env);
3544         struct lfsck_namespace *ns = com->lc_file_ram;
3545         struct lfsck_instance *lfsck = com->lc_lfsck;
3546         struct lu_fid *pfid = &info->lti_fid2;
3547         struct lu_name *cname = &info->lti_name;
3548         struct lu_seq_range *range = &info->lti_range;
3549         struct seq_server_site *ss = lfsck_dev_site(lfsck);
3550         __u32 idx = lfsck_dev_idx(lfsck);
3551         int rc;
3552         bool remote = false;
3553         ENTRY;
3554
3555         if (!(lfsck->li_bookmark_ram.lb_param & LPF_ALL_TGT))
3556                 RETURN(0);
3557
3558         rc = lfsck_links_read_with_rec(env, obj, &ldata);
3559         if (rc == -ENOENT || rc == -ENODATA)
3560                 RETURN(0);
3561
3562         if (rc && rc != -EINVAL)
3563                 GOTO(out, rc);
3564
3565         /* We check the agent entry again after verifying the linkEA
3566          * successfully. So invalid linkEA should be dryrun mode. */
3567         if (rc == -EINVAL || unlikely(!ldata.ld_leh->leh_reccount))
3568                 RETURN(0);
3569
3570         linkea_first_entry(&ldata);
3571         while (ldata.ld_lee != NULL && !remote) {
3572                 linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen,
3573                                     cname, pfid);
3574                 if (!linkea_entry_is_valid(&ldata, cname, pfid))
3575                         GOTO(out, rc = 0);
3576
3577                 fld_range_set_mdt(range);
3578                 rc = fld_server_lookup(env, ss->ss_server_fld,
3579                                        fid_seq(pfid), range);
3580                 if (rc)
3581                         GOTO(out, rc = (rc == -ENOENT ? 0 : rc));
3582
3583                 if (range->lsr_index != idx)
3584                         remote = true;
3585                 else
3586                         linkea_next_entry(&ldata);
3587         }
3588
3589         if ((lu_object_has_agent_entry(&obj->do_lu) && !remote) ||
3590             (!lu_object_has_agent_entry(&obj->do_lu) && remote)) {
3591                 struct dt_device *dev = lfsck_obj2dev(obj);
3592                 struct linkea_data ldata2 = { NULL };
3593                 struct lustre_handle lh = { 0 };
3594                 struct lu_buf linkea_buf;
3595                 struct thandle *handle;
3596
3597                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
3598                         GOTO(out, rc = 1);
3599
3600                 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
3601                                       MDS_INODELOCK_UPDATE |
3602                                       MDS_INODELOCK_XATTR, LCK_EX);
3603                 if (rc)
3604                         GOTO(out, rc);
3605
3606                 handle = lfsck_trans_create(env, dev, lfsck);
3607                 if (IS_ERR(handle))
3608                         GOTO(unlock, rc = PTR_ERR(handle));
3609
3610                 lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
3611                                ldata.ld_leh->leh_len);
3612                 rc = dt_declare_xattr_set(env, obj, &linkea_buf,
3613                                 XATTR_NAME_LINK, LU_XATTR_REPLACE, handle);
3614                 if (rc)
3615                         GOTO(stop, rc);
3616
3617                 rc = dt_trans_start_local(env, dev, handle);
3618                 if (rc)
3619                         GOTO(stop, rc);
3620
3621                 dt_write_lock(env, obj, 0);
3622                 rc = lfsck_links_read2_with_rec(env, obj, &ldata2);
3623                 if (rc) {
3624                         if (rc == -ENOENT || rc == -ENODATA)
3625                                 rc = 0;
3626                         GOTO(unlock2, rc);
3627                 }
3628
3629                 /* If someone changed linkEA by race, then the agent
3630                  * entry will be updated by lower layer automatically. */
3631                 if (ldata.ld_leh->leh_len != ldata2.ld_leh->leh_len ||
3632                     memcmp(ldata.ld_buf->lb_buf, ldata2.ld_buf->lb_buf,
3633                            ldata.ld_leh->leh_len) != 0)
3634                         GOTO(unlock2, rc = 0);
3635
3636                 rc = dt_xattr_set(env, obj, &linkea_buf, XATTR_NAME_LINK,
3637                                   LU_XATTR_REPLACE, handle);
3638                 if (!rc)
3639                         rc = 1;
3640
3641                 GOTO(unlock2, rc);
3642
3643 unlock2:
3644                 dt_write_unlock(env, obj);
3645 stop:
3646                 dt_trans_stop(env, dev, handle);
3647 unlock:
3648                 lfsck_ibits_unlock(&lh, LCK_EX);
3649         }
3650
3651         GOTO(out, rc);
3652
3653 out:
3654         if (rc > 0)
3655                 ns->ln_agent_entries_repaired++;
3656         if (rc)
3657                 CDEBUG(D_LFSCK, "%s: repair agent entry for "DFID": rc = %d\n",
3658                        lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
3659         return rc;
3660 }
3661
3662 /**
3663  * Double scan the MDT-object for namespace LFSCK.
3664  *
3665  * If the MDT-object contains invalid or repeated linkEA entries, then drop
3666  * those entries from the linkEA; if the linkEA becomes empty or the object
3667  * has no linkEA, then it is an orphan and will be added into the directory
3668  * .lustre/lost+found/MDTxxxx/; if the remote parent is lost, then recreate
3669  * the remote parent; if the name entry corresponding to some linkEA entry
3670  * is lost, then add the name entry back to the namespace.
3671  *
3672  * \param[in] env       pointer to the thread context
3673  * \param[in] com       pointer to the lfsck component
3674  * \param[in] child     pointer to the dt_object to be handled
3675  * \param[in] flags     some hints to indicate how the @child should be handled
3676  *
3677  * \retval              positive number for repaired cases
3678  * \retval              0 if nothing to be repaired
3679  * \retval              negative error number on failure
3680  */
3681 static int lfsck_namespace_double_scan_one(const struct lu_env *env,
3682                                            struct lfsck_component *com,
3683                                            struct dt_object *child, __u8 flags)
3684 {
3685         struct lfsck_thread_info *info     = lfsck_env_info(env);
3686         struct lu_attr           *la       = &info->lti_la;
3687         struct lu_name           *cname    = &info->lti_name;
3688         struct lu_fid            *pfid     = &info->lti_fid;
3689         struct lu_fid            *cfid     = &info->lti_fid2;
3690         struct lfsck_instance    *lfsck    = com->lc_lfsck;
3691         struct lfsck_namespace   *ns       = com->lc_file_ram;
3692         struct dt_object         *parent   = NULL;
3693         struct linkea_data        ldata    = { NULL };
3694         bool                      repaired = false;
3695         int                       count    = 0;
3696         int                       rc;
3697         ENTRY;
3698
3699         dt_read_lock(env, child, 0);
3700         if (unlikely(lfsck_is_dead_obj(child))) {
3701                 dt_read_unlock(env, child);
3702
3703                 RETURN(0);
3704         }
3705
3706         if (S_ISDIR(lfsck_object_type(child))) {
3707                 dt_read_unlock(env, child);
3708                 rc = lfsck_namespace_double_scan_dir(env, com, child, flags);
3709                 if (!rc && flags & LNTF_CHECK_AGENT_ENTRY)
3710                         rc = lfsck_namespace_check_agent_entry(env, com, child);
3711
3712                 RETURN(rc);
3713         }
3714
3715         rc = lfsck_links_read(env, child, &ldata);
3716         dt_read_unlock(env, child);
3717
3718         if (rc == -EINVAL) {
3719                 struct lustre_handle lh = { 0 };
3720
3721                 rc = lfsck_ibits_lock(env, com->lc_lfsck, child, &lh,
3722                                       MDS_INODELOCK_UPDATE |
3723                                       MDS_INODELOCK_XATTR, LCK_EX);
3724                 if (rc == 0) {
3725                         rc = lfsck_namespace_links_remove(env, com, child);
3726                         lfsck_ibits_unlock(&lh, LCK_EX);
3727                 }
3728
3729                 GOTO(out, rc);
3730         }
3731
3732         if (rc != 0)
3733                 GOTO(out, rc);
3734
3735         if (!(ns->ln_flags & LF_INCOMPLETE) &&
3736             unlikely(lfsck_namespace_linkea_stale_overflow(&ldata, ns))) {
3737                 rc = lfsck_namespace_linkea_clear_overflow(env, com, &ldata,
3738                                                            child);
3739                 if (rc < 0)
3740                         GOTO(out, rc);
3741
3742                 if (rc > 0)
3743                         ns->ln_linkea_overflow_cleared++;
3744         }
3745
3746         linkea_first_entry(&ldata);
3747         while (ldata.ld_lee != NULL) {
3748                 rc = lfsck_namespace_unpack_linkea_entry(&ldata, cname, pfid,
3749                                                          info->lti_key,
3750                                                          sizeof(info->lti_key));
3751                 /* Invalid PFID in the linkEA entry. */
3752                 if (rc != 0) {
3753                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3754                                                 &ldata, cname, pfid, true);
3755                         if (rc < 0)
3756                                 GOTO(out, rc);
3757
3758                         if (rc > 0)
3759                                 repaired = true;
3760
3761                         continue;
3762                 }
3763
3764                 rc = lfsck_namespace_filter_linkea_entry(&ldata, cname, pfid,
3765                                                          false);
3766                 /* Found repeated linkEA entries */
3767                 if (rc > 0) {
3768                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3769                                                 &ldata, cname, pfid, false);
3770                         if (rc < 0)
3771                                 GOTO(out, rc);
3772
3773                         if (rc == 0)
3774                                 continue;
3775
3776                         repaired = true;
3777
3778                         /* fallthrough */
3779                 }
3780
3781                 parent = lfsck_object_find_bottom(env, lfsck, pfid);
3782                 if (IS_ERR(parent)) {
3783                         rc = PTR_ERR(parent);
3784                         /* if @pfid doesn't have a valid OI mapping, it will
3785                          * trigger OI scrub, and -ENONET is is returned if it's
3786                          * remote, -EINPROGRESS if local.
3787                          */
3788                         if ((rc == -ENOENT || rc == -EINPROGRESS) &&
3789                             ldata.ld_leh->leh_reccount > 1)
3790                                 rc = lfsck_namespace_shrink_linkea(env, com,
3791                                         child, &ldata, cname, pfid, true);
3792                         GOTO(out, rc);
3793                 }
3794
3795                 if (!dt_object_exists(parent)) {
3796
3797 lost_parent:
3798                         if (ldata.ld_leh->leh_reccount > 1) {
3799                                 /* If it is NOT the last linkEA entry, then
3800                                  * there is still other chance to make the
3801                                  * child to be visible via other parent, then
3802                                  * remove this linkEA entry. */
3803                                 rc = lfsck_namespace_shrink_linkea(env, com,
3804                                         child, &ldata, cname, pfid, true);
3805                         } else {
3806                                 /* If the LFSCK is marked as LF_INCOMPLETE,
3807                                  * then means some MDT has ever tried to
3808                                  * verify some remote MDT-object that resides
3809                                  * on this MDT, but this MDT failed to respond
3810                                  * such request. So means there may be some
3811                                  * remote name entry on other MDT that
3812                                  * references this object with another name,
3813                                  * so we cannot know whether this linkEA is
3814                                  * valid or not. So keep it there and maybe
3815                                  * resolved when next LFSCK run. */
3816                                 if (ns->ln_flags & LF_INCOMPLETE) {
3817                                         lfsck_object_put(env, parent);
3818
3819                                         GOTO(out, rc = 0);
3820                                 }
3821
3822                                 /* Create the lost parent as an orphan. */
3823                                 rc = lfsck_namespace_create_orphan_dir(env, com,
3824                                                                 parent, NULL);
3825                                 if (rc < 0) {
3826                                         lfsck_object_put(env, parent);
3827
3828                                         GOTO(out, rc);
3829                                 }
3830
3831                                 if (rc > 0)
3832                                         repaired = true;
3833
3834                                 /* Add the missing name entry to the parent. */
3835                                 rc = lfsck_namespace_insert_normal(env, com,
3836                                                         parent, child, cname);
3837                                 if (unlikely(rc == -EEXIST))
3838                                         /* Unfortunately, someone reused the
3839                                          * name under the parent by race. So we
3840                                          * have to remove the linkEA entry from
3841                                          * current child object. It means that
3842                                          * the LFSCK cannot recover the system
3843                                          * totally back to its original status,
3844                                          * but it is necessary to make the
3845                                          * current system to be consistent. */
3846                                         rc = lfsck_namespace_shrink_linkea(env,
3847                                                         com, child, &ldata,
3848                                                         cname, pfid, true);
3849                                 else
3850                                         linkea_next_entry(&ldata);
3851                         }
3852
3853                         lfsck_object_put(env, parent);
3854                         if (rc < 0)
3855                                 GOTO(out, rc);
3856
3857                         if (rc > 0)
3858                                 repaired = true;
3859
3860                         continue;
3861                 } /* !dt_object_exists(parent) */
3862
3863                 /* The linkEA entry with bad parent will be removed. */
3864                 if (unlikely(!dt_try_as_dir(env, parent))) {
3865                         lfsck_object_put(env, parent);
3866                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3867                                                 &ldata, cname, pfid, true);
3868                         if (rc < 0)
3869                                 GOTO(out, rc);
3870
3871                         if (rc > 0)
3872                                 repaired = true;
3873
3874                         continue;
3875                 }
3876
3877                 rc = dt_lookup_dir(env, parent, cname->ln_name, cfid);
3878                 if (rc != 0 && rc != -ENOENT) {
3879                         lfsck_object_put(env, parent);
3880
3881                         GOTO(out, rc);
3882                 }
3883
3884                 if (rc == 0) {
3885                         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
3886                                 /* It is the most common case that we
3887                                  * find the name entry corresponding
3888                                  * to the linkEA entry. */
3889                                 lfsck_object_put(env, parent);
3890                                 linkea_next_entry(&ldata);
3891                         } else {
3892                                 /* The name entry references another
3893                                  * MDT-object that may be created by
3894                                  * the LFSCK for repairing dangling
3895                                  * name entry. Try to replace it. */
3896                                 rc = lfsck_namespace_replace_cond(env, com,
3897                                                 parent, child, cfid, cname);
3898                                 lfsck_object_put(env, parent);
3899                                 if (rc < 0)
3900                                         GOTO(out, rc);
3901
3902                                 if (rc > 0) {
3903                                         repaired = true;
3904                                         linkea_next_entry(&ldata);
3905                                 } else {
3906                                         rc = lfsck_namespace_shrink_linkea(env,
3907                                                         com, child, &ldata,
3908                                                         cname, pfid, true);
3909                                         if (rc < 0)
3910                                                 GOTO(out, rc);
3911
3912                                         if (rc > 0)
3913                                                 repaired = true;
3914                                 }
3915                         }
3916
3917                         continue;
3918                 }
3919
3920                 /* The following handles -ENOENT case */
3921
3922                 rc = dt_attr_get(env, child, la);
3923                 if (rc != 0)
3924                         GOTO(out, rc);
3925
3926                 /* If there is no name entry in the parent dir and the object
3927                  * link count is fewer than the linkea entries count, then the
3928                  * linkea entry should be removed. */
3929                 if (ldata.ld_leh->leh_reccount > la->la_nlink) {
3930                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
3931                                         parent, child, &ldata, cname, pfid);
3932                         lfsck_object_put(env, parent);
3933                         if (rc < 0)
3934                                 GOTO(out, rc);
3935
3936                         if (rc > 0)
3937                                 repaired = true;
3938
3939                         continue;
3940                 }
3941
3942                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some
3943                  * MDT has ever tried to verify some remote MDT-object that
3944                  * resides on this MDT, but this MDT failed to respond such
3945                  * request. So means there may be some remote name entry on
3946                  * other MDT that references this object with another name,
3947                  * so we cannot know whether this linkEA is valid or not.
3948                  * So keep it there and maybe resolved when next LFSCK run. */
3949                 if (ns->ln_flags & LF_INCOMPLETE) {
3950                         lfsck_object_put(env, parent);
3951
3952                         GOTO(out, rc = 0);
3953                 }
3954
3955                 rc = lfsck_namespace_check_name(env, lfsck, parent, child,
3956                                                 cname);
3957                 if (rc == -ENOENT)
3958                         goto lost_parent;
3959
3960                 if (rc < 0) {
3961                         lfsck_object_put(env, parent);
3962
3963                         GOTO(out, rc);
3964                 }
3965
3966                 /* It is an invalid name entry, drop it. */
3967                 if (unlikely(rc > 0)) {
3968                         lfsck_object_put(env, parent);
3969                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3970                                                 &ldata, cname, pfid, true);
3971                         if (rc < 0)
3972                                 GOTO(out, rc);
3973
3974                         if (rc > 0)
3975                                 repaired = true;
3976
3977                         continue;
3978                 }
3979
3980                 /* Add the missing name entry back to the namespace. */
3981                 rc = lfsck_namespace_insert_normal(env, com, parent, child,
3982                                                    cname);
3983                 if (unlikely(rc == -ESTALE))
3984                         /* It may happen when the remote object has been
3985                          * removed, but the local MDT is not aware of that. */
3986                         goto lost_parent;
3987
3988                 if (unlikely(rc == -EEXIST))
3989                         /* Unfortunately, someone reused the name under the
3990                          * parent by race. So we have to remove the linkEA
3991                          * entry from current child object. It means that the
3992                          * LFSCK cannot recover the system totally back to
3993                          * its original status, but it is necessary to make
3994                          * the current system to be consistent.
3995                          *
3996                          * It also may be because of the LFSCK found some
3997                          * internal status of create operation. Under such
3998                          * case, nothing to be done. */
3999                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
4000                                         parent, child, &ldata, cname, pfid);
4001                 else
4002                         linkea_next_entry(&ldata);
4003
4004                 lfsck_object_put(env, parent);
4005                 if (rc < 0)
4006                         GOTO(out, rc);
4007
4008                 if (rc > 0)
4009                         repaired = true;
4010         }
4011
4012         GOTO(out, rc = 0);
4013
4014 out:
4015         if (rc < 0 && rc != -ENODATA)
4016                 return rc;
4017
4018         if (rc == 0 && ldata.ld_leh != NULL)
4019                 count = ldata.ld_leh->leh_reccount;
4020
4021         if (count == 0) {
4022                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some
4023                  * MDT has ever tried to verify some remote MDT-object that
4024                  * resides on this MDT, but this MDT failed to respond such
4025                  * request. So means there may be some remote name entry on
4026                  * other MDT that references this object with another name,
4027                  * so we cannot know whether this linkEA is valid or not.
4028                  * So keep it there and maybe resolved when next LFSCK run. */
4029                 if (!(ns->ln_flags & LF_INCOMPLETE) &&
4030                     (ldata.ld_leh == NULL ||
4031                      !ldata.ld_leh->leh_overflow_time)) {
4032                         /* If the child becomes orphan, then insert it into
4033                          * the global .lustre/lost+found/MDTxxxx directory. */
4034                         rc = lfsck_namespace_insert_orphan(env, com, child,
4035                                                            "", "O", &count);
4036                         if (rc < 0)
4037                                 return rc;
4038
4039                         if (rc > 0) {
4040                                 ns->ln_mul_ref_repaired++;
4041                                 repaired = true;
4042                         }
4043                 }
4044         } else {
4045                 rc = dt_attr_get(env, child, la);
4046                 if (rc != 0)
4047                         return rc;
4048
4049                 if (la->la_nlink != 0 && la->la_nlink != count) {
4050                         if (unlikely(!S_ISREG(lfsck_object_type(child)) &&
4051                                      !S_ISLNK(lfsck_object_type(child)))) {
4052                                 CDEBUG(D_LFSCK, "%s: namespace LFSCK finds "
4053                                        "the object "DFID"'s nlink count %d "
4054                                        "does not match linkEA count %d, "
4055                                        "type %o, skip it.\n",
4056                                        lfsck_lfsck2name(lfsck),
4057                                        PFID(lfsck_dto2fid(child)),
4058                                        la->la_nlink, count,
4059                                        lfsck_object_type(child));
4060                         } else if (la->la_nlink < count &&
4061                                    likely(!ldata.ld_leh->leh_overflow_time)) {
4062                                 rc = lfsck_namespace_repair_nlink(env, com,
4063                                                                   child, la);
4064                                 if (rc > 0) {
4065                                         ns->ln_objs_nlink_repaired++;
4066                                         rc = 0;
4067                                 }
4068                         }
4069                 }
4070         }
4071
4072         if (repaired) {
4073                 if (la->la_nlink > 1)
4074                         ns->ln_mul_linked_repaired++;
4075
4076                 if (rc == 0)
4077                         rc = 1;
4078         }
4079
4080         if (!rc && flags & LNTF_CHECK_AGENT_ENTRY)
4081                 rc = lfsck_namespace_check_agent_entry(env, com, child);
4082
4083         return rc;
4084 }
4085
4086 static void lfsck_namespace_dump_statistics(struct seq_file *m,
4087                                             struct lfsck_namespace *ns,
4088                                             __u64 checked_phase1,
4089                                             __u64 checked_phase2,
4090                                             time64_t time_phase1,
4091                                             time64_t time_phase2, bool dryrun)
4092 {
4093         const char *postfix = dryrun ? "inconsistent" : "repaired";
4094
4095         seq_printf(m, "checked_phase1: %llu\n"
4096                    "checked_phase2: %llu\n"
4097                    "%s_phase1: %llu\n"
4098                    "%s_phase2: %llu\n"
4099                    "failed_phase1: %llu\n"
4100                    "failed_phase2: %llu\n"
4101                    "directories: %llu\n"
4102                    "dirent_%s: %llu\n"
4103                    "linkea_%s: %llu\n"
4104                    "nlinks_%s: %llu\n"
4105                    "multiple_linked_checked: %llu\n"
4106                    "multiple_linked_%s: %llu\n"
4107                    "unknown_inconsistency: %llu\n"
4108                    "unmatched_pairs_%s: %llu\n"
4109                    "dangling_%s: %llu\n"
4110                    "multiple_referenced_%s: %llu\n"
4111                    "bad_file_type_%s: %llu\n"
4112                    "lost_dirent_%s: %llu\n"
4113                    "local_lost_found_scanned: %llu\n"
4114                    "local_lost_found_moved: %llu\n"
4115                    "local_lost_found_skipped: %llu\n"
4116                    "local_lost_found_failed: %llu\n"
4117                    "striped_dirs_scanned: %llu\n"
4118                    "striped_dirs_%s: %llu\n"
4119                    "striped_dirs_failed: %llu\n"
4120                    "striped_dirs_disabled: %llu\n"
4121                    "striped_dirs_skipped: %llu\n"
4122                    "striped_shards_scanned: %llu\n"
4123                    "striped_shards_%s: %llu\n"
4124                    "striped_shards_failed: %llu\n"
4125                    "striped_shards_skipped: %llu\n"
4126                    "name_hash_%s: %llu\n"
4127                    "linkea_overflow_%s: %llu\n"
4128                    "agent_entries_%s: %llu\n"
4129                    "success_count: %u\n"
4130                    "run_time_phase1: %lld seconds\n"
4131                    "run_time_phase2: %lld seconds\n",
4132                    checked_phase1,
4133                    checked_phase2,
4134                    dryrun ? "inconsistent" : "updated",
4135                    ns->ln_items_repaired,
4136                    dryrun ? "inconsistent" : "updated",
4137                    ns->ln_objs_repaired_phase2,
4138                    ns->ln_items_failed,
4139                    ns->ln_objs_failed_phase2,
4140                    ns->ln_dirs_checked,
4141                    postfix, ns->ln_dirent_repaired,
4142                    postfix, ns->ln_linkea_repaired,
4143                    postfix, ns->ln_objs_nlink_repaired,
4144                    ns->ln_mul_linked_checked,
4145                    postfix, ns->ln_mul_linked_repaired,
4146                    ns->ln_unknown_inconsistency,
4147                    postfix, ns->ln_unmatched_pairs_repaired,
4148                    postfix, ns->ln_dangling_repaired,
4149                    postfix, ns->ln_mul_ref_repaired,
4150                    postfix, ns->ln_bad_type_repaired,
4151                    postfix, ns->ln_lost_dirent_repaired,
4152                    ns->ln_local_lpf_scanned,
4153                    ns->ln_local_lpf_moved,
4154                    ns->ln_local_lpf_skipped,
4155                    ns->ln_local_lpf_failed,
4156                    ns->ln_striped_dirs_scanned,
4157                    postfix, ns->ln_striped_dirs_repaired,
4158                    ns->ln_striped_dirs_failed,
4159                    ns->ln_striped_dirs_disabled,
4160                    ns->ln_striped_dirs_skipped,
4161                    ns->ln_striped_shards_scanned,
4162                    postfix, ns->ln_striped_shards_repaired,
4163                    ns->ln_striped_shards_failed,
4164                    ns->ln_striped_shards_skipped,
4165                    postfix, ns->ln_name_hash_repaired,
4166                    dryrun ? "inconsistent" : "cleared",
4167                    ns->ln_linkea_overflow_cleared,
4168                    postfix, ns->ln_agent_entries_repaired,
4169                    ns->ln_success_count,
4170                    time_phase1,
4171                    time_phase2);
4172 }
4173
4174 static void lfsck_namespace_release_lmv(const struct lu_env *env,
4175                                         struct lfsck_component *com)
4176 {
4177         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4178         struct lfsck_namespace          *ns     = com->lc_file_ram;
4179
4180         while (!list_empty(&lfsck->li_list_lmv)) {
4181                 struct lfsck_lmv_unit   *llu;
4182                 struct lfsck_lmv        *llmv;
4183
4184                 llu = list_entry(lfsck->li_list_lmv.next,
4185                                  struct lfsck_lmv_unit, llu_link);
4186                 llmv = &llu->llu_lmv;
4187
4188                 LASSERTF(atomic_read(&llmv->ll_ref) == 1,
4189                          "still in using: %u\n",
4190                          atomic_read(&llmv->ll_ref));
4191
4192                 ns->ln_striped_dirs_skipped++;
4193                 lfsck_lmv_put(env, llmv);
4194         }
4195 }
4196
4197 static int lfsck_namespace_check_for_double_scan(const struct lu_env *env,
4198                                                  struct lfsck_component *com,
4199                                                  struct dt_object *obj)
4200 {
4201         struct lu_attr *la = &lfsck_env_info(env)->lti_la;
4202         int             rc;
4203
4204         rc = dt_attr_get(env, obj, la);
4205         if (rc != 0)
4206                 return rc;
4207
4208         /* zero-linkEA object may be orphan, but it also maybe because
4209          * of upgrading. Currently, we cannot record it for double scan.
4210          * Because it may cause the LFSCK trace file to be too large. */
4211
4212         /* "la_ctime" == 1 means that it has ever been removed from
4213          * backend /lost+found directory but not been added back to
4214          * the normal namespace yet. */
4215
4216         if ((S_ISREG(lfsck_object_type(obj)) && la->la_nlink > 1) ||
4217             unlikely(la->la_ctime == 1))
4218                 rc = lfsck_namespace_trace_update(env, com, lfsck_dto2fid(obj),
4219                                                   LNTF_CHECK_LINKEA, true);
4220
4221         return rc;
4222 }
4223
4224 /* namespace APIs */
4225
4226 static int lfsck_namespace_reset(const struct lu_env *env,
4227                                  struct lfsck_component *com, bool init)
4228 {
4229         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4230         struct lfsck_namespace          *ns     = com->lc_file_ram;
4231         struct lfsck_assistant_data     *lad    = com->lc_data;
4232         struct dt_object                *root;
4233         int                              rc;
4234         ENTRY;
4235
4236         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
4237         if (IS_ERR(root))
4238                 GOTO(log, rc = PTR_ERR(root));
4239
4240         if (unlikely(!dt_try_as_dir(env, root)))
4241                 GOTO(put, rc = -ENOTDIR);
4242
4243         down_write(&com->lc_sem);
4244         if (init) {
4245                 memset(ns, 0, sizeof(*ns));
4246         } else {
4247                 __u32 count = ns->ln_success_count;
4248                 time64_t last_time = ns->ln_time_last_complete;
4249
4250                 memset(ns, 0, sizeof(*ns));
4251                 ns->ln_success_count = count;
4252                 ns->ln_time_last_complete = last_time;
4253         }
4254         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
4255         ns->ln_status = LS_INIT;
4256         ns->ln_time_latest_reset = ktime_get_real_seconds();
4257
4258         rc = lfsck_load_one_trace_file(env, com, root, &com->lc_obj,
4259                                        &dt_lfsck_namespace_features,
4260                                        LFSCK_NAMESPACE, true);
4261         if (rc)
4262                 GOTO(out, rc);
4263
4264         rc = lfsck_load_sub_trace_files(env, com, &dt_lfsck_namespace_features,
4265                                         LFSCK_NAMESPACE, true);
4266         if (rc != 0)
4267                 GOTO(out, rc);
4268
4269         clear_bit(LAD_INCOMPLETE, &lad->lad_flags);
4270         CFS_RESET_BITMAP(lad->lad_bitmap);
4271
4272         rc = lfsck_namespace_store(env, com);
4273
4274         GOTO(out, rc);
4275
4276 out:
4277         up_write(&com->lc_sem);
4278
4279 put:
4280         lfsck_object_put(env, root);
4281 log:
4282         CDEBUG(D_LFSCK, "%s: namespace LFSCK reset: rc = %d\n",
4283                lfsck_lfsck2name(lfsck), rc);
4284         return rc;
4285 }
4286
4287 static void
4288 lfsck_namespace_fail(const struct lu_env *env, struct lfsck_component *com,
4289                      bool new_checked)
4290 {
4291         struct lfsck_namespace *ns = com->lc_file_ram;
4292
4293         down_write(&com->lc_sem);
4294         if (new_checked)
4295                 com->lc_new_checked++;
4296         lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
4297         up_write(&com->lc_sem);
4298 }
4299
4300 static void lfsck_namespace_close_dir(const struct lu_env *env,
4301                                       struct lfsck_component *com)
4302 {
4303         struct lfsck_namespace          *ns     = com->lc_file_ram;
4304         struct lfsck_assistant_data     *lad    = com->lc_data;
4305         struct lfsck_assistant_object   *lso    = NULL;
4306         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4307         struct lfsck_lmv                *llmv   = lfsck->li_lmv;
4308         struct lfsck_namespace_req      *lnr;
4309         struct lu_attr *la = &lfsck_env_info(env)->lti_la2;
4310         __u32 size = sizeof(*lnr) + LFSCK_TMPBUF_LEN;
4311         int rc;
4312         bool wakeup = false;
4313         ENTRY;
4314
4315         if (llmv == NULL)
4316                 RETURN_EXIT;
4317
4318         rc = dt_attr_get(env, lfsck->li_obj_dir, la);
4319         if (rc)
4320                 RETURN_EXIT;
4321
4322         OBD_ALLOC(lnr, size);
4323         if (lnr == NULL) {
4324                 ns->ln_striped_dirs_skipped++;
4325
4326                 RETURN_EXIT;
4327         }
4328
4329         lso = lfsck_assistant_object_init(env, lfsck_dto2fid(lfsck->li_obj_dir),
4330                         la, lfsck->li_pos_current.lp_oit_cookie, true);
4331         if (IS_ERR(lso)) {
4332                 OBD_FREE(lnr, size);
4333                 ns->ln_striped_dirs_skipped++;
4334
4335                 RETURN_EXIT;
4336         }
4337
4338         /* Generate a dummy request to indicate that all shards' name entry
4339          * in this striped directory has been scanned for the first time. */
4340         INIT_LIST_HEAD(&lnr->lnr_lar.lar_list);
4341         lnr->lnr_lar.lar_parent = lso;
4342         lnr->lnr_lmv = lfsck_lmv_get(llmv);
4343         lnr->lnr_fid = *lfsck_dto2fid(lfsck->li_obj_dir);
4344         lnr->lnr_dir_cookie = MDS_DIR_END_OFF;
4345         lnr->lnr_size = size;
4346         lnr->lnr_type = lso->lso_attr.la_mode;
4347
4348         spin_lock(&lad->lad_lock);
4349         if (lad->lad_assistant_status < 0 ||
4350             unlikely(!thread_is_running(&lfsck->li_thread) ||
4351                      !thread_is_running(&lad->lad_thread))) {
4352                 spin_unlock(&lad->lad_lock);
4353                 lfsck_namespace_assistant_req_fini(env, &lnr->lnr_lar);
4354                 ns->ln_striped_dirs_skipped++;
4355
4356                 RETURN_EXIT;
4357         }
4358
4359         list_add_tail(&lnr->lnr_lar.lar_list, &lad->lad_req_list);
4360         if (lad->lad_prefetched == 0)
4361                 wakeup = true;
4362
4363         lad->lad_prefetched++;
4364         spin_unlock(&lad->lad_lock);
4365         if (wakeup)
4366                 wake_up(&lad->lad_thread.t_ctl_waitq);
4367
4368         EXIT;
4369 }
4370
4371 static int lfsck_namespace_open_dir(const struct lu_env *env,
4372                                     struct lfsck_component *com)
4373 {
4374         struct lfsck_instance   *lfsck  = com->lc_lfsck;
4375         struct lfsck_namespace  *ns     = com->lc_file_ram;
4376         struct lfsck_lmv        *llmv   = lfsck->li_lmv;
4377         int                      rc     = 0;
4378         ENTRY;
4379
4380         if (llmv == NULL)
4381                 RETURN(0);
4382
4383         if (llmv->ll_lmv_master) {
4384                 struct lmv_mds_md_v1 *lmv = &llmv->ll_lmv;
4385
4386                 if (lmv->lmv_master_mdt_index != lfsck_dev_idx(lfsck)) {
4387                         lmv->lmv_master_mdt_index =
4388                                 lfsck_dev_idx(lfsck);
4389                         ns->ln_flags |= LF_INCONSISTENT;
4390                         llmv->ll_lmv_updated = 1;
4391                 }
4392         } else {
4393                 rc = lfsck_namespace_verify_stripe_slave(env, com,
4394                                         lfsck->li_obj_dir, llmv);
4395         }
4396
4397         RETURN(rc > 0 ? 0 : rc);
4398 }
4399
4400 static int lfsck_namespace_checkpoint(const struct lu_env *env,
4401                                       struct lfsck_component *com, bool init)
4402 {
4403         struct lfsck_instance   *lfsck = com->lc_lfsck;
4404         struct lfsck_namespace  *ns    = com->lc_file_ram;
4405         int                      rc;
4406
4407         if (!init) {
4408                 rc = lfsck_checkpoint_generic(env, com);
4409                 if (rc != 0)
4410                         goto log;
4411         }
4412
4413         down_write(&com->lc_sem);
4414         if (init) {
4415                 ns->ln_pos_latest_start = lfsck->li_pos_checkpoint;
4416         } else {
4417                 ns->ln_pos_last_checkpoint = lfsck->li_pos_checkpoint;
4418                 ns->ln_run_time_phase1 += ktime_get_seconds() -
4419                                           lfsck->li_time_last_checkpoint;
4420                 ns->ln_time_last_checkpoint = ktime_get_real_seconds();
4421                 ns->ln_items_checked += com->lc_new_checked;
4422                 com->lc_new_checked = 0;
4423         }
4424
4425         rc = lfsck_namespace_store(env, com);
4426         up_write(&com->lc_sem);
4427
4428 log:
4429         CDEBUG(D_LFSCK, "%s: namespace LFSCK checkpoint at the pos [%llu"
4430                ", "DFID", %#llx], status = %d: rc = %d\n",
4431                lfsck_lfsck2name(lfsck), lfsck->li_pos_current.lp_oit_cookie,
4432                PFID(&lfsck->li_pos_current.lp_dir_parent),
4433                lfsck->li_pos_current.lp_dir_cookie, ns->ln_status, rc);
4434
4435         return rc > 0 ? 0 : rc;
4436 }
4437
4438 static int lfsck_namespace_prep(const struct lu_env *env,
4439                                 struct lfsck_component *com,
4440                                 struct lfsck_start_param *lsp)
4441 {
4442         struct lfsck_instance   *lfsck  = com->lc_lfsck;
4443         struct lfsck_namespace  *ns     = com->lc_file_ram;
4444         struct lfsck_position   *pos    = &com->lc_pos_start;
4445         int                      rc;
4446
4447         rc = lfsck_namespace_load_bitmap(env, com);
4448         if (rc != 0 || ns->ln_status == LS_COMPLETED) {
4449                 rc = lfsck_namespace_reset(env, com, false);
4450                 if (rc == 0)
4451                         rc = lfsck_set_param(env, lfsck, lsp->lsp_start, true);
4452
4453                 if (rc != 0) {
4454                         CDEBUG(D_LFSCK, "%s: namespace LFSCK prep failed: "
4455                                "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
4456
4457                         return rc;
4458                 }
4459         }
4460
4461         down_write(&com->lc_sem);
4462         ns->ln_time_latest_start = ktime_get_real_seconds();
4463         spin_lock(&lfsck->li_lock);
4464
4465         if (ns->ln_flags & LF_SCANNED_ONCE) {
4466                 if (!lfsck->li_drop_dryrun ||
4467                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
4468                         ns->ln_status = LS_SCANNING_PHASE2;
4469                         list_move_tail(&com->lc_link,
4470                                        &lfsck->li_list_double_scan);
4471                         if (!list_empty(&com->lc_link_dir))
4472                                 list_del_init(&com->lc_link_dir);
4473                         lfsck_pos_set_zero(pos);
4474                 } else {
4475                         ns->ln_status = LS_SCANNING_PHASE1;
4476                         ns->ln_run_time_phase1 = 0;
4477                         ns->ln_run_time_phase2 = 0;
4478                         ns->ln_items_checked = 0;
4479                         ns->ln_items_repaired = 0;
4480                         ns->ln_items_failed = 0;
4481                         ns->ln_dirs_checked = 0;
4482                         ns->ln_objs_checked_phase2 = 0;
4483                         ns->ln_objs_repaired_phase2 = 0;
4484                         ns->ln_objs_failed_phase2 = 0;
4485                         ns->ln_objs_nlink_repaired = 0;
4486                         ns->ln_dirent_repaired = 0;
4487                         ns->ln_linkea_repaired = 0;
4488                         ns->ln_mul_linked_checked = 0;
4489                         ns->ln_mul_linked_repaired = 0;
4490                         ns->ln_unknown_inconsistency = 0;
4491                         ns->ln_unmatched_pairs_repaired = 0;
4492                         ns->ln_dangling_repaired = 0;
4493                         ns->ln_mul_ref_repaired = 0;
4494                         ns->ln_bad_type_repaired = 0;
4495                         ns->ln_lost_dirent_repaired = 0;
4496                         ns->ln_striped_dirs_scanned = 0;
4497                         ns->ln_striped_dirs_repaired = 0;
4498                         ns->ln_striped_dirs_failed = 0;
4499                         ns->ln_striped_dirs_disabled = 0;
4500                         ns->ln_striped_dirs_skipped = 0;
4501                         ns->ln_striped_shards_scanned = 0;
4502                         ns->ln_striped_shards_repaired = 0;
4503                         ns->ln_striped_shards_failed = 0;
4504                         ns->ln_striped_shards_skipped = 0;
4505                         ns->ln_name_hash_repaired = 0;
4506                         fid_zero(&ns->ln_fid_latest_scanned_phase2);
4507                         if (list_empty(&com->lc_link_dir))
4508                                 list_add_tail(&com->lc_link_dir,
4509                                               &lfsck->li_list_dir);
4510                         *pos = ns->ln_pos_first_inconsistent;
4511                 }
4512         } else {
4513                 ns->ln_status = LS_SCANNING_PHASE1;
4514                 if (list_empty(&com->lc_link_dir))
4515                         list_add_tail(&com->lc_link_dir,
4516                                       &lfsck->li_list_dir);
4517                 if (!lfsck->li_drop_dryrun ||
4518                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
4519                         *pos = ns->ln_pos_last_checkpoint;
4520                         pos->lp_oit_cookie++;
4521                 } else {
4522                         *pos = ns->ln_pos_first_inconsistent;
4523                 }
4524         }
4525
4526         spin_unlock(&lfsck->li_lock);
4527         up_write(&com->lc_sem);
4528
4529         rc = lfsck_start_assistant(env, com, lsp);
4530
4531         CDEBUG(D_LFSCK, "%s: namespace LFSCK prep done, start pos [%llu, "
4532                DFID", %#llx]: rc = %d\n",
4533                lfsck_lfsck2name(lfsck), pos->lp_oit_cookie,
4534                PFID(&pos->lp_dir_parent), pos->lp_dir_cookie, rc);
4535
4536         return rc;
4537 }
4538
4539 static int lfsck_namespace_exec_oit(const struct lu_env *env,
4540                                     struct lfsck_component *com,
4541                                     struct dt_object *obj)
4542 {
4543         struct lfsck_thread_info *info = lfsck_env_info(env);
4544         struct lfsck_namespace *ns = com->lc_file_ram;
4545         struct lfsck_instance *lfsck = com->lc_lfsck;
4546         const struct lu_fid *fid = lfsck_dto2fid(obj);
4547         struct lu_fid *pfid = &info->lti_fid2;
4548         struct lu_name *cname = &info->lti_name;
4549         struct lu_seq_range *range = &info->lti_range;
4550         struct seq_server_site *ss = lfsck_dev_site(lfsck);
4551         struct linkea_data ldata = { NULL };
4552         __u32 idx = lfsck_dev_idx(lfsck);
4553         struct lu_attr la = { .la_valid = 0 };
4554         bool remote = false;
4555         int rc;
4556         ENTRY;
4557
4558         rc = dt_attr_get(env, obj, &la);
4559         if (unlikely(rc || (la.la_valid & LA_FLAGS &&
4560                             la.la_flags & LUSTRE_ORPHAN_FL))) {
4561                 CDEBUG(D_INFO,
4562                        "%s: skip orphan "DFID", %llx/%x: rc = %d\n",
4563                        lfsck_lfsck2name(lfsck), PFID(fid),
4564                        la.la_valid, la.la_flags, rc);
4565
4566                 return rc;
4567         }
4568
4569         rc = lfsck_links_read(env, obj, &ldata);
4570         if (rc == -ENOENT)
4571                 GOTO(out, rc = 0);
4572
4573         /* -EINVAL means crashed linkEA, should be verified. */
4574         if (rc == -EINVAL) {
4575                 rc = lfsck_namespace_trace_update(env, com, fid,
4576                                                   LNTF_CHECK_LINKEA, true);
4577                 if (rc == 0) {
4578                         struct lustre_handle lh = { 0 };
4579
4580                         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
4581                                               MDS_INODELOCK_UPDATE |
4582                                               MDS_INODELOCK_XATTR, LCK_EX);
4583                         if (rc == 0) {
4584                                 rc = lfsck_namespace_links_remove(env, com,
4585                                                                   obj);
4586                                 lfsck_ibits_unlock(&lh, LCK_EX);
4587                         }
4588                 }
4589
4590                 GOTO(out, rc = (rc == -ENOENT ? 0 : rc));
4591         }
4592
4593         if (rc && rc != -ENODATA)
4594                 GOTO(out, rc);
4595
4596         if (rc == -ENODATA || unlikely(!ldata.ld_leh->leh_reccount)) {
4597                 rc = lfsck_namespace_check_for_double_scan(env, com, obj);
4598
4599                 GOTO(out, rc);
4600         }
4601
4602         linkea_first_entry(&ldata);
4603         while (ldata.ld_lee != NULL) {
4604                 linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen,
4605                                     cname, pfid);
4606                 if (!fid_is_sane(pfid)) {
4607                         rc = lfsck_namespace_trace_update(env, com, fid,
4608                                                   LNTF_CHECK_PARENT, true);
4609                 } else if (!linkea_entry_is_valid(&ldata, cname, pfid)) {
4610                         GOTO(out, rc);
4611                 } else {
4612                         fld_range_set_mdt(range);
4613                         rc = fld_server_lookup(env, ss->ss_server_fld,
4614                                                fid_seq(pfid), range);
4615                         if ((rc == -ENOENT) ||
4616                             (!rc && range->lsr_index != idx)) {
4617                                 remote = true;
4618                                 break;
4619                         }
4620                 }
4621                 if (rc)
4622                         GOTO(out, rc);
4623
4624                 linkea_next_entry(&ldata);
4625         }
4626
4627         if ((lu_object_has_agent_entry(&obj->do_lu) && !remote) ||
4628             (!lu_object_has_agent_entry(&obj->do_lu) && remote)) {
4629                 rc = lfsck_namespace_trace_update(env, com, fid,
4630                                                   LNTF_CHECK_AGENT_ENTRY, true);
4631                 if (rc)
4632                         GOTO(out, rc);
4633         }
4634
4635         /* Record multiple-linked object. */
4636         if (ldata.ld_leh->leh_reccount > 1) {
4637                 rc = lfsck_namespace_trace_update(env, com, fid,
4638                                                   LNTF_CHECK_LINKEA, true);
4639
4640                 GOTO(out, rc);
4641         }
4642
4643         if (remote)
4644                 rc = lfsck_namespace_trace_update(env, com, fid,
4645                                                   LNTF_CHECK_LINKEA, true);
4646         else
4647                 rc = lfsck_namespace_check_for_double_scan(env, com, obj);
4648
4649         GOTO(out, rc);
4650
4651 out:
4652         down_write(&com->lc_sem);
4653         if (S_ISDIR(lfsck_object_type(obj)))
4654                 ns->ln_dirs_checked++;
4655         if (rc != 0)
4656                 lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
4657         up_write(&com->lc_sem);
4658
4659         return rc;
4660 }
4661
4662 static int lfsck_namespace_exec_dir(const struct lu_env *env,
4663                                     struct lfsck_component *com,
4664                                     struct lfsck_assistant_object *lso,
4665                                     struct lu_dirent *ent, __u16 type)
4666 {
4667         struct lfsck_assistant_data     *lad     = com->lc_data;
4668         struct lfsck_instance           *lfsck   = com->lc_lfsck;
4669         struct lfsck_namespace_req      *lnr;
4670         struct lfsck_bookmark           *bk      = &lfsck->li_bookmark_ram;
4671         struct ptlrpc_thread            *mthread = &lfsck->li_thread;
4672         struct ptlrpc_thread            *athread = &lad->lad_thread;
4673         bool                             wakeup  = false;
4674
4675         wait_event_idle(mthread->t_ctl_waitq,
4676                         lad->lad_prefetched < bk->lb_async_windows ||
4677                         !thread_is_running(mthread) ||
4678                         !thread_is_running(athread));
4679
4680         if (unlikely(!thread_is_running(mthread) ||
4681                      !thread_is_running(athread)))
4682                 return 0;
4683
4684         if (unlikely(lfsck_is_dead_obj(lfsck->li_obj_dir)))
4685                 return 0;
4686
4687         lnr = lfsck_namespace_assistant_req_init(com->lc_lfsck, lso, ent, type);
4688         if (IS_ERR(lnr)) {
4689                 struct lfsck_namespace *ns = com->lc_file_ram;
4690
4691                 lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
4692                 return PTR_ERR(lnr);
4693         }
4694
4695         spin_lock(&lad->lad_lock);
4696         if (lad->lad_assistant_status < 0 ||
4697             unlikely(!thread_is_running(mthread) ||
4698                      !thread_is_running(athread))) {
4699                 spin_unlock(&lad->lad_lock);
4700                 lfsck_namespace_assistant_req_fini(env, &lnr->lnr_lar);
4701                 return lad->lad_assistant_status;
4702         }
4703
4704         list_add_tail(&lnr->lnr_lar.lar_list, &lad->lad_req_list);
4705         if (lad->lad_prefetched == 0)
4706                 wakeup = true;
4707
4708         lad->lad_prefetched++;
4709         spin_unlock(&lad->lad_lock);
4710         if (wakeup)
4711                 wake_up(&lad->lad_thread.t_ctl_waitq);
4712
4713         down_write(&com->lc_sem);
4714         com->lc_new_checked++;
4715         up_write(&com->lc_sem);
4716
4717         return 0;
4718 }
4719
4720 static int lfsck_namespace_post(const struct lu_env *env,
4721                                 struct lfsck_component *com,
4722                                 int result, bool init)
4723 {
4724         struct lfsck_instance   *lfsck = com->lc_lfsck;
4725         struct lfsck_namespace  *ns    = com->lc_file_ram;
4726         int                      rc;
4727         ENTRY;
4728
4729         lfsck_post_generic(env, com, &result);
4730
4731         down_write(&com->lc_sem);
4732         lfsck_namespace_release_lmv(env, com);
4733
4734         spin_lock(&lfsck->li_lock);
4735         if (!init)
4736                 ns->ln_pos_last_checkpoint = lfsck->li_pos_checkpoint;
4737         if (result > 0) {
4738                 ns->ln_status = LS_SCANNING_PHASE2;
4739                 ns->ln_flags |= LF_SCANNED_ONCE;
4740                 ns->ln_flags &= ~LF_UPGRADE;
4741                 list_del_init(&com->lc_link_dir);
4742                 list_move_tail(&com->lc_link, &lfsck->li_list_double_scan);
4743         } else if (result == 0) {
4744                 if (lfsck->li_status != 0)
4745                         ns->ln_status = lfsck->li_status;
4746                 else
4747                         ns->ln_status = LS_STOPPED;
4748                 if (ns->ln_status != LS_PAUSED) {
4749                         list_del_init(&com->lc_link_dir);
4750                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4751                 }
4752         } else {
4753                 ns->ln_status = LS_FAILED;
4754                 list_del_init(&com->lc_link_dir);
4755                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4756         }
4757         spin_unlock(&lfsck->li_lock);
4758
4759         if (!init) {
4760                 ns->ln_run_time_phase1 += ktime_get_seconds() -
4761                                           lfsck->li_time_last_checkpoint;
4762                 ns->ln_time_last_checkpoint = ktime_get_real_seconds();
4763                 ns->ln_items_checked += com->lc_new_checked;
4764                 com->lc_new_checked = 0;
4765         }
4766
4767         rc = lfsck_namespace_store(env, com);
4768         up_write(&com->lc_sem);
4769
4770         CDEBUG(D_LFSCK, "%s: namespace LFSCK post done: rc = %d\n",
4771                lfsck_lfsck2name(lfsck), rc);
4772
4773         RETURN(rc);
4774 }
4775
4776 static void
4777 lfsck_namespace_dump(const struct lu_env *env, struct lfsck_component *com,
4778                      struct seq_file *m)
4779 {
4780         struct lfsck_instance   *lfsck = com->lc_lfsck;
4781         struct lfsck_bookmark   *bk    = &lfsck->li_bookmark_ram;
4782         struct lfsck_namespace  *ns    = com->lc_file_ram;
4783
4784         down_read(&com->lc_sem);
4785         seq_printf(m, "name: lfsck_namespace\n"
4786                    "magic: %#x\n"
4787                    "version: %d\n"
4788                    "status: %s\n",
4789                    ns->ln_magic,
4790                    bk->lb_version,
4791                    lfsck_status2name(ns->ln_status));
4792
4793         lfsck_bits_dump(m, ns->ln_flags, lfsck_flags_names, "flags");
4794
4795         lfsck_bits_dump(m, bk->lb_param, lfsck_param_names, "param");
4796
4797         lfsck_time_dump(m, ns->ln_time_last_complete, "last_completed");
4798
4799         lfsck_time_dump(m, ns->ln_time_latest_start, "latest_start");
4800
4801         lfsck_time_dump(m, ns->ln_time_last_checkpoint, "last_checkpoint");
4802
4803         lfsck_pos_dump(m, &ns->ln_pos_latest_start, "latest_start_position");
4804
4805         lfsck_pos_dump(m, &ns->ln_pos_last_checkpoint,
4806                        "last_checkpoint_position");
4807
4808         lfsck_pos_dump(m, &ns->ln_pos_first_inconsistent,
4809                        "first_failure_position");
4810
4811         if (ns->ln_status == LS_SCANNING_PHASE1) {
4812                 struct lfsck_position pos;
4813                 time64_t duration = ktime_get_seconds() -
4814                                     lfsck->li_time_last_checkpoint;
4815                 u64 checked = ns->ln_items_checked + com->lc_new_checked;
4816                 u64 speed = checked;
4817                 u64 new_checked = com->lc_new_checked;
4818                 time64_t rtime = ns->ln_run_time_phase1 + duration;
4819
4820                 if (duration != 0)
4821                         new_checked = div64_s64(new_checked, duration);
4822
4823                 if (rtime != 0)
4824                         speed = div64_s64(speed, rtime);
4825
4826                 lfsck_namespace_dump_statistics(m, ns, checked, 0, rtime, 0,
4827                                                 bk->lb_param & LPF_DRYRUN);
4828                 seq_printf(m, "average_speed_phase1: %llu items/sec\n"
4829                            "average_speed_phase2: N/A\n"
4830                            "average_speed_total: %llu items/sec\n"
4831                            "real_time_speed_phase1: %llu items/sec\n"
4832                            "real_time_speed_phase2: N/A\n",
4833                            speed,
4834                            speed,
4835                            new_checked);
4836
4837                 if (likely(lfsck->li_di_oit)) {
4838                         const struct dt_it_ops *iops =
4839                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
4840
4841                         /* The low layer otable-based iteration position may NOT
4842                          * exactly match the namespace-based directory traversal
4843                          * cookie. Generally, it is not a serious issue. But the
4844                          * caller should NOT make assumption on that. */
4845                         pos.lp_oit_cookie = iops->store(env, lfsck->li_di_oit);
4846                         if (!lfsck->li_current_oit_processed)
4847                                 pos.lp_oit_cookie--;
4848
4849                         spin_lock(&lfsck->li_lock);
4850                         if (lfsck->li_di_dir) {
4851                                 pos.lp_dir_cookie = lfsck->li_cookie_dir;
4852                                 if (pos.lp_dir_cookie >= MDS_DIR_END_OFF) {
4853                                         fid_zero(&pos.lp_dir_parent);
4854                                         pos.lp_dir_cookie = 0;
4855                                 } else {
4856                                         pos.lp_dir_parent =
4857                                         *lfsck_dto2fid(lfsck->li_obj_dir);
4858                                 }
4859                         } else {
4860                                 fid_zero(&pos.lp_dir_parent);
4861                                 pos.lp_dir_cookie = 0;
4862                         }
4863                         spin_unlock(&lfsck->li_lock);
4864                 } else {
4865                         pos = ns->ln_pos_last_checkpoint;
4866                 }
4867
4868                 lfsck_pos_dump(m, &pos, "current_position");
4869         } else if (ns->ln_status == LS_SCANNING_PHASE2) {
4870                 time64_t duration = ktime_get_seconds() -
4871                                     com->lc_time_last_checkpoint;
4872                 __u64 checked = ns->ln_objs_checked_phase2 +
4873                                 com->lc_new_checked;
4874                 __u64 speed1 = ns->ln_items_checked;
4875                 __u64 speed2 = checked;
4876                 __u64 speed0 = speed1 + speed2;
4877                 __u64 new_checked = com->lc_new_checked;
4878                 time64_t rtime = ns->ln_run_time_phase2 + duration;
4879                 time64_t time0 = ns->ln_run_time_phase1 + rtime;
4880
4881                 if (duration != 0)
4882                         new_checked = div64_s64(new_checked, duration);
4883
4884                 if (ns->ln_run_time_phase1 != 0)
4885                         speed1 = div64_s64(speed1, ns->ln_run_time_phase1);
4886                 else if (ns->ln_items_checked != 0)
4887                         time0++;
4888
4889                 if (rtime != 0)
4890                         speed2 = div64_s64(speed2, rtime);
4891                 else if (checked != 0)
4892                         time0++;
4893
4894                 if (time0 != 0)
4895                         speed0 = div64_s64(speed0, time0);
4896
4897                 lfsck_namespace_dump_statistics(m, ns, ns->ln_items_checked,
4898                                                 checked,
4899                                                 ns->ln_run_time_phase1, rtime,
4900                                                 bk->lb_param & LPF_DRYRUN);
4901                 seq_printf(m, "average_speed_phase1: %llu items/sec\n"
4902                            "average_speed_phase2: %llu objs/sec\n"
4903                            "average_speed_total: %llu items/sec\n"
4904                            "real_time_speed_phase1: N/A\n"
4905                            "real_time_speed_phase2: %llu objs/sec\n"
4906                            "current_position: "DFID"\n",
4907                            speed1,
4908                            speed2,
4909                            speed0,
4910                            new_checked,
4911                            PFID(&ns->ln_fid_latest_scanned_phase2));
4912         } else {
4913                 __u64 speed1 = ns->ln_items_checked;
4914                 __u64 speed2 = ns->ln_objs_checked_phase2;
4915                 __u64 speed0 = speed1 + speed2;
4916                 time64_t time0 = ns->ln_run_time_phase1 + ns->ln_run_time_phase2;
4917
4918                 if (ns->ln_run_time_phase1 != 0)
4919                         speed1 = div64_s64(speed1, ns->ln_run_time_phase1);
4920                 else if (ns->ln_items_checked != 0)
4921                         time0++;
4922
4923                 if (ns->ln_run_time_phase2 != 0)
4924                         speed2 = div64_s64(speed2, ns->ln_run_time_phase2);
4925                 else if (ns->ln_objs_checked_phase2 != 0)
4926                         time0++;
4927
4928                 if (time0 != 0)
4929                         speed0 = div64_s64(speed0, time0);
4930
4931                 lfsck_namespace_dump_statistics(m, ns, ns->ln_items_checked,
4932                                                 ns->ln_objs_checked_phase2,
4933                                                 ns->ln_run_time_phase1,
4934                                                 ns->ln_run_time_phase2,
4935                                                 bk->lb_param & LPF_DRYRUN);
4936                 seq_printf(m, "average_speed_phase1: %llu items/sec\n"
4937                            "average_speed_phase2: %llu objs/sec\n"
4938                            "average_speed_total: %llu items/sec\n"
4939                            "real_time_speed_phase1: N/A\n"
4940                            "real_time_speed_phase2: N/A\n"
4941                            "current_position: N/A\n",
4942                            speed1,
4943                            speed2,
4944                            speed0);
4945         }
4946
4947         up_read(&com->lc_sem);
4948 }
4949
4950 static int lfsck_namespace_double_scan(const struct lu_env *env,
4951                                        struct lfsck_component *com)
4952 {
4953         struct lfsck_namespace          *ns     = com->lc_file_ram;
4954         struct lfsck_assistant_data     *lad    = com->lc_data;
4955         struct lfsck_tgt_descs          *ltds   = &com->lc_lfsck->li_mdt_descs;
4956         struct lfsck_tgt_desc           *ltd;
4957         struct lfsck_tgt_desc           *next;
4958         int                              rc;
4959
4960         rc = lfsck_double_scan_generic(env, com, ns->ln_status);
4961         if (thread_is_stopped(&lad->lad_thread)) {
4962                 LASSERT(list_empty(&lad->lad_req_list));
4963                 LASSERT(list_empty(&lad->lad_mdt_phase1_list));
4964
4965                 spin_lock(&ltds->ltd_lock);
4966                 list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
4967                                          ltd_namespace_phase_list) {
4968                         list_del_init(&ltd->ltd_namespace_phase_list);
4969                 }
4970                 spin_unlock(&ltds->ltd_lock);
4971         }
4972
4973         return rc;
4974 }
4975
4976 static void lfsck_namespace_data_release(const struct lu_env *env,
4977                                          struct lfsck_component *com)
4978 {
4979         struct lfsck_assistant_data     *lad    = com->lc_data;
4980         struct lfsck_tgt_descs          *ltds   = &com->lc_lfsck->li_mdt_descs;
4981         struct lfsck_tgt_desc           *ltd;
4982         struct lfsck_tgt_desc           *next;
4983
4984         LASSERT(lad != NULL);
4985         LASSERT(thread_is_init(&lad->lad_thread) ||
4986                 thread_is_stopped(&lad->lad_thread));
4987         LASSERT(list_empty(&lad->lad_req_list));
4988
4989         com->lc_data = NULL;
4990         lfsck_namespace_release_lmv(env, com);
4991
4992         spin_lock(&ltds->ltd_lock);
4993         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase1_list,
4994                                  ltd_namespace_phase_list) {
4995                 list_del_init(&ltd->ltd_namespace_phase_list);
4996         }
4997         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
4998                                  ltd_namespace_phase_list) {
4999                 list_del_init(&ltd->ltd_namespace_phase_list);
5000         }
5001         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_list,
5002                                  ltd_namespace_list) {
5003                 list_del_init(&ltd->ltd_namespace_list);
5004         }
5005         spin_unlock(&ltds->ltd_lock);
5006
5007         if (likely(lad->lad_bitmap != NULL))
5008                 CFS_FREE_BITMAP(lad->lad_bitmap);
5009
5010         OBD_FREE_PTR(lad);
5011 }
5012
5013 static void lfsck_namespace_quit(const struct lu_env *env,
5014                                  struct lfsck_component *com)
5015 {
5016         struct lfsck_assistant_data     *lad    = com->lc_data;
5017         struct lfsck_tgt_descs          *ltds   = &com->lc_lfsck->li_mdt_descs;
5018         struct lfsck_tgt_desc           *ltd;
5019         struct lfsck_tgt_desc           *next;
5020
5021         LASSERT(lad != NULL);
5022
5023         lfsck_quit_generic(env, com);
5024
5025         LASSERT(thread_is_init(&lad->lad_thread) ||
5026                 thread_is_stopped(&lad->lad_thread));
5027         LASSERT(list_empty(&lad->lad_req_list));
5028
5029         lfsck_namespace_release_lmv(env, com);
5030
5031         spin_lock(&ltds->ltd_lock);
5032         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase1_list,
5033                                  ltd_namespace_phase_list) {
5034                 list_del_init(&ltd->ltd_namespace_phase_list);
5035         }
5036         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
5037                                  ltd_namespace_phase_list) {
5038                 list_del_init(&ltd->ltd_namespace_phase_list);
5039         }
5040         spin_unlock(&ltds->ltd_lock);
5041 }
5042
5043 static int lfsck_namespace_in_notify(const struct lu_env *env,
5044                                      struct lfsck_component *com,
5045                                      struct lfsck_request *lr)
5046 {
5047         struct lfsck_instance *lfsck = com->lc_lfsck;
5048         struct lfsck_namespace *ns = com->lc_file_ram;
5049         struct lfsck_assistant_data *lad = com->lc_data;
5050         struct lfsck_tgt_descs *ltds = &lfsck->li_mdt_descs;
5051         struct lfsck_tgt_desc *ltd;
5052         int rc = 0;
5053         bool fail = false;
5054         ENTRY;
5055
5056         switch (lr->lr_event) {
5057         case LE_SET_LMV_MASTER: {
5058                 struct dt_object        *obj;
5059
5060                 obj = lfsck_object_find_bottom(env, lfsck, &lr->lr_fid);
5061                 if (IS_ERR(obj))
5062                         RETURN(PTR_ERR(obj));
5063
5064                 if (likely(dt_object_exists(obj)))
5065                         rc = lfsck_namespace_notify_lmv_master_local(env, com,
5066                                                                      obj);
5067
5068                 lfsck_object_put(env, obj);
5069
5070                 RETURN(rc > 0 ? 0 : rc);
5071         }
5072         case LE_SET_LMV_SLAVE: {
5073                 if (!(lr->lr_flags & LEF_RECHECK_NAME_HASH))
5074                         ns->ln_striped_shards_repaired++;
5075
5076                 rc = lfsck_namespace_trace_update(env, com, &lr->lr_fid,
5077                                                   LNTF_RECHECK_NAME_HASH, true);
5078
5079                 RETURN(rc > 0 ? 0 : rc);
5080         }
5081         case LE_PHASE1_DONE:
5082         case LE_PHASE2_DONE:
5083         case LE_PEER_EXIT:
5084                 break;
5085         default:
5086                 RETURN(-EINVAL);
5087         }
5088
5089         CDEBUG(D_LFSCK, "%s: namespace LFSCK handles notify %u from MDT %x, "
5090                "status %d, flags %x\n", lfsck_lfsck2name(lfsck), lr->lr_event,
5091                lr->lr_index, lr->lr_status, lr->lr_flags2);
5092
5093         spin_lock(&ltds->ltd_lock);
5094         ltd = lfsck_ltd2tgt(ltds, lr->lr_index);
5095         if (ltd == NULL) {
5096                 spin_unlock(&ltds->ltd_lock);
5097
5098                 RETURN(-ENXIO);
5099         }
5100
5101         list_del_init(&ltd->ltd_namespace_phase_list);
5102         switch (lr->lr_event) {
5103         case LE_PHASE1_DONE:
5104                 if (lr->lr_status <= 0) {
5105                         ltd->ltd_namespace_done = 1;
5106                         list_del_init(&ltd->ltd_namespace_list);
5107                         CDEBUG(D_LFSCK, "%s: MDT %x failed/stopped at "
5108                                "phase1 for namespace LFSCK: rc = %d.\n",
5109                                lfsck_lfsck2name(lfsck),
5110                                ltd->ltd_index, lr->lr_status);
5111                         ns->ln_flags |= LF_INCOMPLETE;
5112                         fail = true;
5113                         break;
5114                 }
5115
5116                 if (lr->lr_flags2 & LF_INCOMPLETE)
5117                         ns->ln_flags |= LF_INCOMPLETE;
5118
5119                 if (list_empty(&ltd->ltd_namespace_list))
5120                         list_add_tail(&ltd->ltd_namespace_list,
5121                                       &lad->lad_mdt_list);
5122                 list_add_tail(&ltd->ltd_namespace_phase_list,
5123                               &lad->lad_mdt_phase2_list);
5124                 break;
5125         case LE_PHASE2_DONE:
5126                 ltd->ltd_namespace_done = 1;
5127                 list_del_init(&ltd->ltd_namespace_list);
5128                 break;
5129         case LE_PEER_EXIT:
5130                 fail = true;
5131                 ltd->ltd_namespace_done = 1;
5132                 list_del_init(&ltd->ltd_namespace_list);
5133                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT)) {
5134                         CDEBUG(D_LFSCK,
5135                                "%s: the peer MDT %x exit namespace LFSCK\n",
5136                                lfsck_lfsck2name(lfsck), ltd->ltd_index);
5137                         ns->ln_flags |= LF_INCOMPLETE;
5138                 }
5139                 break;
5140         default:
5141                 break;
5142         }
5143         spin_unlock(&ltds->ltd_lock);
5144
5145         if (fail && lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT) {
5146                 struct lfsck_stop *stop = &lfsck_env_info(env)->lti_stop;
5147
5148                 memset(stop, 0, sizeof(*stop));
5149                 stop->ls_status = lr->lr_status;
5150                 stop->ls_flags = lr->lr_param & ~LPF_BROADCAST;
5151                 lfsck_stop(env, lfsck->li_bottom, stop);
5152         } else if (lfsck_phase2_next_ready(lad)) {
5153                 wake_up(&lad->lad_thread.t_ctl_waitq);
5154         }
5155
5156         RETURN(0);
5157 }
5158
5159 static void lfsck_namespace_repaired(struct lfsck_namespace *ns, __u64 *count)
5160 {
5161         *count += ns->ln_objs_nlink_repaired;
5162         *count += ns->ln_dirent_repaired;
5163         *count += ns->ln_linkea_repaired;
5164         *count += ns->ln_mul_linked_repaired;
5165         *count += ns->ln_unmatched_pairs_repaired;
5166         *count += ns->ln_dangling_repaired;
5167         *count += ns->ln_mul_ref_repaired;
5168         *count += ns->ln_bad_type_repaired;
5169         *count += ns->ln_lost_dirent_repaired;
5170         *count += ns->ln_striped_dirs_disabled;
5171         *count += ns->ln_striped_dirs_repaired;
5172         *count += ns->ln_striped_shards_repaired;
5173         *count += ns->ln_name_hash_repaired;
5174         *count += ns->ln_local_lpf_moved;
5175 }
5176
5177 static int lfsck_namespace_query_all(const struct lu_env *env,
5178                                      struct lfsck_component *com,
5179                                      __u32 *mdts_count, __u64 *repaired)
5180 {
5181         struct lfsck_namespace *ns = com->lc_file_ram;
5182         struct lfsck_tgt_descs *ltds = &com->lc_lfsck->li_mdt_descs;
5183         struct lfsck_tgt_desc *ltd;
5184         int idx;
5185         int rc;
5186         ENTRY;
5187
5188         rc = lfsck_query_all(env, com);
5189         if (rc != 0)
5190                 RETURN(rc);
5191
5192         down_read(&ltds->ltd_rw_sem);
5193         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
5194                 ltd = lfsck_ltd2tgt(ltds, idx);
5195                 LASSERT(ltd != NULL);
5196
5197                 mdts_count[ltd->ltd_namespace_status]++;
5198                 *repaired += ltd->ltd_namespace_repaired;
5199         }
5200         up_read(&ltds->ltd_rw_sem);
5201
5202         down_read(&com->lc_sem);
5203         mdts_count[ns->ln_status]++;
5204         lfsck_namespace_repaired(ns, repaired);
5205         up_read(&com->lc_sem);
5206
5207         RETURN(0);
5208 }
5209
5210 static int lfsck_namespace_query(const struct lu_env *env,
5211                                  struct lfsck_component *com,
5212                                  struct lfsck_request *req,
5213                                  struct lfsck_reply *rep,
5214                                  struct lfsck_query *que, int idx)
5215 {
5216         struct lfsck_namespace *ns = com->lc_file_ram;
5217         int rc = 0;
5218
5219         if (que != NULL) {
5220                 LASSERT(com->lc_lfsck->li_master);
5221
5222                 rc = lfsck_namespace_query_all(env, com,
5223                                                que->lu_mdts_count[idx],
5224                                                &que->lu_repaired[idx]);
5225         } else {
5226                 down_read(&com->lc_sem);
5227                 rep->lr_status = ns->ln_status;
5228                 if (req->lr_flags & LEF_QUERY_ALL)
5229                         lfsck_namespace_repaired(ns, &rep->lr_repaired);
5230                 up_read(&com->lc_sem);
5231         }
5232
5233         return rc;
5234 }
5235
5236 static const struct lfsck_operations lfsck_namespace_ops = {
5237         .lfsck_reset            = lfsck_namespace_reset,
5238         .lfsck_fail             = lfsck_namespace_fail,
5239         .lfsck_close_dir        = lfsck_namespace_close_dir,
5240         .lfsck_open_dir         = lfsck_namespace_open_dir,
5241         .lfsck_checkpoint       = lfsck_namespace_checkpoint,
5242         .lfsck_prep             = lfsck_namespace_prep,
5243         .lfsck_exec_oit         = lfsck_namespace_exec_oit,
5244         .lfsck_exec_dir         = lfsck_namespace_exec_dir,
5245         .lfsck_post             = lfsck_namespace_post,
5246         .lfsck_dump             = lfsck_namespace_dump,
5247         .lfsck_double_scan      = lfsck_namespace_double_scan,
5248         .lfsck_data_release     = lfsck_namespace_data_release,
5249         .lfsck_quit             = lfsck_namespace_quit,
5250         .lfsck_in_notify        = lfsck_namespace_in_notify,
5251         .lfsck_query            = lfsck_namespace_query,
5252 };
5253
5254 /**
5255  * Repair dangling name entry.
5256  *
5257  * For the name entry with dangling reference, we need to repare the
5258  * inconsistency according to the LFSCK sponsor's requirement:
5259  *
5260  * 1) Keep the inconsistency there and report the inconsistency case,
5261  *    then give the chance to the application to find related issues,
5262  *    and the users can make the decision about how to handle it with
5263  *    more human knownledge. (by default)
5264  *
5265  * 2) Re-create the missing MDT-object with the FID information.
5266  *
5267  * \param[in] env       pointer to the thread context
5268  * \param[in] com       pointer to the lfsck component
5269  * \param[in] parent    pointer to the dir object that contains the dangling
5270  *                      name entry
5271  * \param[in] child     pointer to the object corresponding to the dangling
5272  *                      name entry
5273  * \param[in] lnr       pointer to the namespace request that contains the
5274  *                      name's name, parent object, parent's LMV, and ect.
5275  *
5276  * \retval              positive number if no need to repair
5277  * \retval              zero for repaired successfully
5278  * \retval              negative error number on failure
5279  */
5280 int lfsck_namespace_repair_dangling(const struct lu_env *env,
5281                                     struct lfsck_component *com,
5282                                     struct dt_object *parent,
5283                                     struct dt_object *child,
5284                                     struct lfsck_namespace_req *lnr)
5285 {
5286         struct lfsck_thread_info *info = lfsck_env_info(env);
5287         struct lu_attr *la = &info->lti_la;
5288         struct dt_allocation_hint *hint = &info->lti_hint;
5289         struct dt_object_format *dof = &info->lti_dof;
5290         struct dt_insert_rec *rec = &info->lti_dt_rec;
5291         struct lmv_mds_md_v1 *lmv2 = &info->lti_lmv2;
5292         const struct lu_name *cname;
5293         const struct lu_fid *pfid = lfsck_dto2fid(parent);
5294         const struct lu_fid *cfid = lfsck_dto2fid(child);
5295         struct linkea_data ldata = { NULL };
5296         struct lfsck_lock_handle *llh = &info->lti_llh;
5297         struct lustre_handle rlh = { 0 };
5298         struct lustre_handle clh = { 0 };
5299         struct lu_buf linkea_buf;
5300         struct lu_buf lmv_buf;
5301         struct lfsck_instance *lfsck = com->lc_lfsck;
5302         struct lfsck_bookmark *bk = &lfsck->li_bookmark_ram;
5303         struct dt_device *dev = lfsck->li_next;
5304         struct thandle *th = NULL;
5305         int rc = 0;
5306         __u16 type = lnr->lnr_type;
5307         bool create;
5308         ENTRY;
5309
5310         cname = lfsck_name_get_const(env, lnr->lnr_name, lnr->lnr_namelen);
5311         if (bk->lb_param & LPF_CREATE_MDTOBJ)
5312                 create = true;
5313         else
5314                 create = false;
5315
5316         if (!create || bk->lb_param & LPF_DRYRUN)
5317                 GOTO(log, rc = 0);
5318
5319         /* We may need to create the sub-objects of the @child via LOD,
5320          * so make the modification based on lfsck->li_next. */
5321
5322         parent = lfsck_object_locate(dev, parent);
5323         if (IS_ERR(parent))
5324                 GOTO(log, rc = PTR_ERR(parent));
5325
5326         if (unlikely(!dt_try_as_dir(env, parent)))
5327                 GOTO(log, rc = -ENOTDIR);
5328
5329         child = lfsck_object_locate(dev, child);
5330         if (IS_ERR(child))
5331                 GOTO(log, rc = PTR_ERR(child));
5332
5333         rc = linkea_links_new(&ldata, &info->lti_linkea_buf2,
5334                               cname, pfid);
5335         if (rc != 0)
5336                 GOTO(log, rc);
5337
5338         rc = lfsck_lock(env, lfsck, parent, lnr->lnr_name, llh,
5339                         MDS_INODELOCK_UPDATE, LCK_PW);
5340         if (rc != 0)
5341                 GOTO(log, rc);
5342
5343         rc = lfsck_namespace_check_exist(env, parent, child, lnr->lnr_name);
5344         if (rc != 0)
5345                 GOTO(log, rc);
5346
5347         if (dt_object_remote(child)) {
5348                 rc = lfsck_remote_lookup_lock(env, lfsck, parent, child, &rlh,
5349                                               LCK_EX);
5350                 if (rc != 0)
5351                         GOTO(log, rc);
5352         }
5353
5354         rc = lfsck_ibits_lock(env, lfsck, child, &clh,
5355                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_LOOKUP |
5356                               MDS_INODELOCK_XATTR, LCK_EX);
5357         if (rc != 0)
5358                 GOTO(unlock_remote_lookup, rc);
5359
5360         /* Set the ctime as zero, then others can know it is created for
5361          * repairing dangling name entry by LFSCK. And if the LFSCK made
5362          * wrong decision and the real MDT-object has been found later,
5363          * then the LFSCK has chance to fix the incosistency properly. */
5364         memset(la, 0, sizeof(*la));
5365         if (S_ISDIR(type))
5366                 la->la_mode = (type & S_IFMT) | 0700;
5367         else
5368                 la->la_mode = (type & S_IFMT) | 0600;
5369         la->la_valid = LA_TYPE | LA_MODE | LA_CTIME;
5370
5371         /*
5372          * if it's directory, skip do_ah_init() to create a plain directory
5373          * because it may have shards already, which will be inserted back
5374          * later, besides, it may be remote, and creating stripe directory
5375          * remotely is not supported.
5376          */
5377         if (S_ISREG(type))
5378                 child->do_ops->do_ah_init(env, hint,  parent, child, type);
5379         else if (S_ISDIR(type))
5380                 child->do_ops->do_ah_init(env, hint,  NULL, child, type);
5381
5382         memset(dof, 0, sizeof(*dof));
5383         dof->dof_type = dt_mode_to_dft(type);
5384         /* If the target is a regular file, then the LFSCK will only create
5385          * the MDT-object without stripes (dof->dof_reg.striped = 0). related
5386          * OST-objects will be created when write open. */
5387
5388         th = lfsck_trans_create(env, dev, lfsck);
5389         if (IS_ERR(th))
5390                 GOTO(unlock_child, rc = PTR_ERR(th));
5391
5392         /* 1a. create child. */
5393         rc = dt_declare_create(env, child, la, hint, dof, th);
5394         if (rc != 0)
5395                 GOTO(stop, rc);
5396
5397         if (S_ISDIR(type)) {
5398                 if (unlikely(!dt_try_as_dir(env, child)))
5399                         GOTO(stop, rc = -ENOTDIR);
5400
5401                 /* 2a. increase child nlink */
5402                 rc = dt_declare_ref_add(env, child, th);
5403                 if (rc != 0)
5404                         GOTO(stop, rc);
5405
5406                 /* 3a. insert dot into child dir */
5407                 rec->rec_type = S_IFDIR;
5408                 rec->rec_fid = cfid;
5409                 rc = dt_declare_insert(env, child,
5410                                        (const struct dt_rec *)rec,
5411                                        (const struct dt_key *)dot, th);
5412                 if (rc != 0)
5413                         GOTO(stop, rc);
5414
5415                 /* 4a. insert dotdot into child dir */
5416                 rec->rec_fid = pfid;
5417                 rc = dt_declare_insert(env, child,
5418                                        (const struct dt_rec *)rec,
5419                                        (const struct dt_key *)dotdot, th);
5420                 if (rc != 0)
5421                         GOTO(stop, rc);
5422
5423                 /* 5a. generate slave LMV EA. */
5424                 if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
5425                         int idx;
5426
5427                         idx = lfsck_shard_name_to_index(env,
5428                                         lnr->lnr_name, lnr->lnr_namelen,
5429                                         type, cfid);
5430                         if (unlikely(idx < 0))
5431                                 GOTO(stop, rc = idx);
5432
5433                         *lmv2 = lnr->lnr_lmv->ll_lmv;
5434                         lmv2->lmv_magic = LMV_MAGIC_STRIPE;
5435                         lmv2->lmv_master_mdt_index = idx;
5436
5437                         lfsck_lmv_header_cpu_to_le(lmv2, lmv2);
5438                         lfsck_buf_init(&lmv_buf, lmv2, sizeof(*lmv2));
5439                         rc = dt_declare_xattr_set(env, child, &lmv_buf,
5440                                                   XATTR_NAME_LMV, 0, th);
5441                         if (rc != 0)
5442                                 GOTO(stop, rc);
5443                 }
5444         }
5445
5446         /* 6a. insert linkEA for child */
5447         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
5448                        ldata.ld_leh->leh_len);
5449         rc = dt_declare_xattr_set(env, child, &linkea_buf,
5450                                   XATTR_NAME_LINK, 0, th);
5451         if (rc != 0)
5452                 GOTO(stop, rc);
5453
5454         /* 7a. if child is remote, delete and insert to generate local agent */
5455         if (dt_object_remote(child)) {
5456                 rc = dt_declare_delete(env, parent,
5457                                        (const struct dt_key *)lnr->lnr_name,
5458                                        th);
5459                 if (rc)
5460                         GOTO(stop, rc);
5461
5462                 rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
5463                                        (const struct dt_key *)lnr->lnr_name,
5464                                        th);
5465                 if (rc)
5466                         GOTO(stop, rc);
5467         }
5468
5469         rc = dt_trans_start_local(env, dev, th);
5470         if (rc != 0)
5471                 GOTO(stop, rc = (rc == -EEXIST ? 1 : rc));
5472
5473         dt_write_lock(env, child, 0);
5474         /* 1b. create child */
5475         rc = dt_create(env, child, la, hint, dof, th);
5476         if (rc != 0)
5477                 GOTO(unlock, rc = (rc == -EEXIST ? 1 : rc));
5478
5479         if (S_ISDIR(type)) {
5480                 /* 2b. increase child nlink */
5481                 rc = dt_ref_add(env, child, th);
5482                 if (rc != 0)
5483                         GOTO(unlock, rc);
5484
5485                 /* 3b. insert dot into child dir */
5486                 rec->rec_type = S_IFDIR;
5487                 rec->rec_fid = cfid;
5488                 rc = dt_insert(env, child, (const struct dt_rec *)rec,
5489                                (const struct dt_key *)dot, th);
5490                 if (rc != 0)
5491                         GOTO(unlock, rc);
5492
5493                 /* 4b. insert dotdot into child dir */
5494                 rec->rec_fid = pfid;
5495                 rc = dt_insert(env, child, (const struct dt_rec *)rec,
5496                                (const struct dt_key *)dotdot, th);
5497                 if (rc != 0)
5498                         GOTO(unlock, rc);
5499
5500                 /* 5b. generate slave LMV EA. */
5501                 if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
5502                         rc = dt_xattr_set(env, child, &lmv_buf, XATTR_NAME_LMV,
5503                                           0, th);
5504                         if (rc != 0)
5505                                 GOTO(unlock, rc);
5506                 }
5507         }
5508
5509         /* 6b. insert linkEA for child. */
5510         rc = dt_xattr_set(env, child, &linkea_buf,
5511                           XATTR_NAME_LINK, 0, th);
5512         if (rc)
5513                 GOTO(unlock, rc);
5514
5515         /* 7b. if child is remote, delete and insert to generate local agent */
5516         if (dt_object_remote(child)) {
5517                 rc = dt_delete(env, parent,
5518                                (const struct dt_key *)lnr->lnr_name, th);
5519                 if (rc)
5520                         GOTO(unlock, rc);
5521
5522                 rec->rec_type = type;
5523                 rec->rec_fid = cfid;
5524                 rc = dt_insert(env, parent, (const struct dt_rec *)rec,
5525                                (const struct dt_key *)lnr->lnr_name, th);
5526                 if (rc)
5527                         GOTO(unlock, rc);
5528         }
5529
5530         GOTO(unlock, rc);
5531
5532 unlock:
5533         dt_write_unlock(env, child);
5534
5535 stop:
5536         dt_trans_stop(env, dev, th);
5537
5538 unlock_child:
5539         lfsck_ibits_unlock(&clh, LCK_EX);
5540 unlock_remote_lookup:
5541         if (dt_object_remote(child))
5542                 lfsck_ibits_unlock(&rlh, LCK_EX);
5543 log:
5544         lfsck_unlock(llh);
5545         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found dangling "
5546                "reference for: parent "DFID", child "DFID", type %u, "
5547                "name %s. %s: rc = %d\n", lfsck_lfsck2name(lfsck),
5548                PFID(pfid), PFID(cfid), type, cname->ln_name,
5549                create ? "Create the lost MDT-object as required" :
5550                         "Keep the MDT-object there by default", rc);
5551
5552         if (rc <= 0) {
5553                 struct lfsck_namespace *ns = com->lc_file_ram;
5554
5555                 ns->ln_flags |= LF_INCONSISTENT;
5556         }
5557
5558         return rc;
5559 }
5560
5561 static int lfsck_namespace_assistant_handler_p1(const struct lu_env *env,
5562                                                 struct lfsck_component *com,
5563                                                 struct lfsck_assistant_req *lar)
5564 {
5565         struct lfsck_thread_info   *info     = lfsck_env_info(env);
5566         struct lu_attr             *la       = &info->lti_la;
5567         struct lfsck_instance      *lfsck    = com->lc_lfsck;
5568         struct lfsck_bookmark      *bk       = &lfsck->li_bookmark_ram;
5569         struct lfsck_namespace     *ns       = com->lc_file_ram;
5570         struct lfsck_assistant_data *lad     = com->lc_data;
5571         struct linkea_data          ldata    = { NULL };
5572         const struct lu_name       *cname;
5573         struct thandle             *handle   = NULL;
5574         struct lfsck_namespace_req *lnr      =
5575                 container_of(lar, struct lfsck_namespace_req, lnr_lar);
5576         struct dt_object           *dir      = NULL;
5577         struct dt_object           *obj      = NULL;
5578         struct lfsck_assistant_object *lso   = lar->lar_parent;
5579         const struct lu_fid        *pfid     = &lso->lso_fid;
5580         struct dt_device           *dev      = NULL;
5581         struct lustre_handle        lh       = { 0 };
5582         bool                        repaired = false;
5583         bool                        dtlocked = false;
5584         bool                        remove = false;
5585         bool                        newdata = false;
5586         bool                        log      = false;
5587         bool                        bad_hash = false;
5588         bool                        bad_linkea = false;
5589         int                         idx      = 0;
5590         int                         count    = 0;
5591         int                         rc       = 0;
5592         enum lfsck_namespace_inconsistency_type type = LNIT_NONE;
5593         ENTRY;
5594
5595         if (lso->lso_dead)
5596                 RETURN(0);
5597
5598         la->la_nlink = 0;
5599         if (lnr->lnr_attr & LUDA_UPGRADE) {
5600                 ns->ln_flags |= LF_UPGRADE;
5601                 ns->ln_dirent_repaired++;
5602                 repaired = true;
5603         } else if (lnr->lnr_attr & LUDA_REPAIR) {
5604                 ns->ln_flags |= LF_INCONSISTENT;
5605                 ns->ln_dirent_repaired++;
5606                 repaired = true;
5607         }
5608
5609         if (unlikely(fid_is_zero(&lnr->lnr_fid) &&
5610                      strcmp(lnr->lnr_name, dotdot) == 0)) {
5611                 rc = lfsck_namespace_trace_update(env, com, pfid,
5612                                                 LNTF_CHECK_PARENT, true);
5613
5614                 GOTO(out, rc);
5615         }
5616
5617         if (unlikely(!fid_is_sane(&lnr->lnr_fid))) {
5618                 CDEBUG(D_LFSCK, "%s: dir scan find invalid FID "DFID
5619                        " for the name entry %.*s under "DFID"\n",
5620                        lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid),
5621                        lnr->lnr_namelen, lnr->lnr_name, PFID(pfid));
5622
5623                 if (strcmp(lnr->lnr_name, dotdot) != 0)
5624                         /* invalid FID means bad name entry, remove it. */
5625                         type = LNIT_BAD_DIRENT;
5626                 else
5627                         /* If the parent FID is invalid, we cannot remove
5628                          * the ".." entry directly. */
5629                         rc = lfsck_namespace_trace_update(env, com, pfid,
5630                                                 LNTF_CHECK_PARENT, true);
5631
5632                 GOTO(out, rc);
5633         }
5634
5635         if (unlikely(lnr->lnr_dir_cookie == MDS_DIR_END_OFF)) {
5636                 rc = lfsck_namespace_striped_dir_rescan(env, com, lnr);
5637
5638                 RETURN(rc);
5639         }
5640
5641         if (fid_seq_is_dot(fid_seq(&lnr->lnr_fid)))
5642                 GOTO(out, rc = 0);
5643
5644         if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
5645                 rc = lfsck_namespace_handle_striped_master(env, com, lnr);
5646
5647                 RETURN(rc);
5648         }
5649
5650         idx = lfsck_find_mdt_idx_by_fid(env, lfsck, &lnr->lnr_fid);
5651         if (idx < 0)
5652                 GOTO(out, rc = idx);
5653
5654         if (idx == lfsck_dev_idx(lfsck)) {
5655                 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0))
5656                         GOTO(out, rc = 0);
5657
5658                 dev = lfsck->li_bottom;
5659         } else {
5660                 struct lfsck_tgt_desc *ltd;
5661
5662                 /* Usually, some local filesystem consistency verification
5663                  * tools can guarantee the local namespace tree consistenct.
5664                  * So the LFSCK will only verify the remote directory. */
5665                 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0)) {
5666                         rc = lfsck_namespace_trace_update(env, com, pfid,
5667                                                 LNTF_CHECK_PARENT, true);
5668
5669                         GOTO(out, rc);
5670                 }
5671
5672                 ltd = lfsck_ltd2tgt(&lfsck->li_mdt_descs, idx);
5673                 if (unlikely(ltd == NULL)) {
5674                         CDEBUG(D_LFSCK, "%s: cannot talk with MDT %x which "
5675                                "did not join the namespace LFSCK\n",
5676                                lfsck_lfsck2name(lfsck), idx);
5677                         lfsck_lad_set_bitmap(env, com, idx);
5678
5679                         GOTO(out, rc = -ENODEV);
5680                 }
5681
5682                 dev = ltd->ltd_tgt;
5683         }
5684
5685         obj = lfsck_object_find_by_dev(env, dev, &lnr->lnr_fid);
5686         if (IS_ERR(obj))
5687                 GOTO(out, rc = PTR_ERR(obj));
5688
5689         cname = lfsck_name_get_const(env, lnr->lnr_name, lnr->lnr_namelen);
5690         if (dt_object_exists(obj) == 0) {
5691
5692 dangling:
5693                 if (dir == NULL) {
5694                         dir = lfsck_assistant_object_load(env, lfsck, lso);
5695                         if (IS_ERR(dir)) {
5696                                 rc = PTR_ERR(dir);
5697
5698                                 GOTO(trace, rc == -ENOENT ? 0 : rc);
5699                         }
5700                 }
5701
5702                 rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
5703                 if (rc == 0) {
5704                         if (!lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
5705                                         lnr->lnr_name, lnr->lnr_namelen)) {
5706                                 type = LNIT_BAD_DIRENT;
5707
5708                                 GOTO(out, rc);
5709                         }
5710
5711                         type = LNIT_DANGLING;
5712                         rc = lfsck_namespace_repair_dangling(env, com, dir,
5713                                                              obj, lnr);
5714                         if (rc == 0)
5715                                 repaired = true;
5716                 }
5717
5718                 GOTO(out, rc);
5719         }
5720
5721         if (!(bk->lb_param & LPF_DRYRUN) && lad->lad_advance_lock) {
5722
5723 again:
5724                 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
5725                                       MDS_INODELOCK_UPDATE |
5726                                       MDS_INODELOCK_XATTR, LCK_EX);
5727                 if (rc != 0)
5728                         GOTO(out, rc);
5729
5730                 handle = lfsck_trans_create(env, dev, lfsck);
5731                 if (IS_ERR(handle))
5732                         GOTO(out, rc = PTR_ERR(handle));
5733
5734                 rc = lfsck_declare_namespace_exec_dir(env, obj, handle);
5735                 if (rc != 0)
5736                         GOTO(stop, rc);
5737
5738                 rc = dt_trans_start_local(env, dev, handle);
5739                 if (rc != 0)
5740                         GOTO(stop, rc);
5741
5742                 dt_write_lock(env, obj, 0);
5743                 dtlocked = true;
5744         }
5745
5746         rc = lfsck_links_read(env, obj, &ldata);
5747         if (unlikely(rc == -ENOENT)) {
5748                 if (handle != NULL) {
5749                         dt_write_unlock(env, obj);
5750                         dtlocked = false;
5751
5752                         dt_trans_stop(env, dev, handle);
5753                         handle = NULL;
5754
5755                         lfsck_ibits_unlock(&lh, LCK_EX);
5756                 }
5757
5758                 /* It may happen when the remote object has been removed,
5759                  * but the local MDT is not aware of that. */
5760                 goto dangling;
5761         } else if (rc == 0) {
5762                 count = ldata.ld_leh->leh_reccount;
5763                 rc = linkea_links_find(&ldata, cname, pfid);
5764                 if ((rc == 0) &&
5765                     (count == 1 || !S_ISDIR(lfsck_object_type(obj)))) {
5766                         if ((lfsck_object_type(obj) & S_IFMT) !=
5767                             lnr->lnr_type) {
5768                                 ns->ln_flags |= LF_INCONSISTENT;
5769                                 type = LNIT_BAD_TYPE;
5770                         }
5771
5772                         goto stop;
5773                 }
5774
5775                 /* If the name entry hash does not match the slave striped
5776                  * directory, and the name entry does not match also, then
5777                  * it is quite possible that name entry is corrupted. */
5778                 if (!lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
5779                                         lnr->lnr_name, lnr->lnr_namelen)) {
5780                         ns->ln_flags |= LF_INCONSISTENT;
5781                         type = LNIT_BAD_DIRENT;
5782
5783                         GOTO(stop, rc = 0);
5784                 }
5785
5786                 /* If the file type stored in the name entry does not match
5787                  * the file type claimed by the object, and the object does
5788                  * not recognize the name entry, then it is quite possible
5789                  * that the name entry is corrupted. */
5790                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type) {
5791                         ns->ln_flags |= LF_INCONSISTENT;
5792                         type = LNIT_BAD_DIRENT;
5793
5794                         GOTO(stop, rc = 0);
5795                 }
5796
5797                 /* For sub-dir object, we cannot make sure whether the sub-dir
5798                  * back references the parent via ".." name entry correctly or
5799                  * not in the LFSCK first-stage scanning. It may be that the
5800                  * (remote) sub-dir ".." name entry has no parent FID after
5801                  * file-level backup/restore and its linkEA may be wrong.
5802                  * So under such case, we should replace the linkEA according
5803                  * to current name entry. But this needs to be done during the
5804                  * LFSCK second-stage scanning. The LFSCK will record the name
5805                  * entry for further possible using. */
5806                 remove = false;
5807                 newdata = false;
5808                 goto nodata;
5809         } else if (unlikely(rc == -EINVAL)) {
5810                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type)
5811                         type = LNIT_BAD_TYPE;
5812
5813                 count = 1;
5814                 /* The magic crashed, we are not sure whether there are more
5815                  * corrupt data in the linkea, so remove all linkea entries. */
5816                 remove = true;
5817                 newdata = true;
5818                 goto nodata;
5819         } else if (rc == -ENODATA) {
5820                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type)
5821                         type = LNIT_BAD_TYPE;
5822
5823                 count = 1;
5824                 remove = false;
5825                 newdata = true;
5826
5827 nodata:
5828                 if (rc == -ENOENT &&
5829                     linkea_will_overflow(&ldata, cname)) {
5830                         CDEBUG(D_INODE, "No enough space to hold linkea entry '"
5831                                DFID": %.*s' at %u\n", PFID(pfid),
5832                                cname->ln_namelen, cname->ln_name,
5833                                ldata.ld_leh->leh_overflow_time);
5834                         log = true;
5835                         rc = 0;
5836                         goto stop;
5837                 }
5838
5839                 if (bk->lb_param & LPF_DRYRUN) {
5840                         if (rc == -ENODATA)
5841                                 ns->ln_flags |= LF_UPGRADE;
5842                         else
5843                                 ns->ln_flags |= LF_INCONSISTENT;
5844                         ns->ln_linkea_repaired++;
5845                         repaired = true;
5846                         log = true;
5847                         goto stop;
5848                 }
5849
5850                 if (!lustre_handle_is_used(&lh)) {
5851                         remove = false;
5852                         newdata = false;
5853                         type = LNIT_NONE;
5854
5855                         goto again;
5856                 }
5857
5858                 LASSERT(handle != NULL);
5859
5860                 if (dir == NULL) {
5861                         dir = lfsck_assistant_object_load(env, lfsck, lso);
5862                         if (IS_ERR(dir)) {
5863                                 rc = PTR_ERR(dir);
5864
5865                                 GOTO(stop, rc == -ENOENT ? 0 : rc);
5866                         }
5867                 }
5868
5869                 rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
5870                 if (rc != 0)
5871                         GOTO(stop, rc);
5872
5873                 bad_linkea = true;
5874                 if (!remove && newdata)
5875                         ns->ln_flags |= LF_UPGRADE;
5876                 else if (remove || !(ns->ln_flags & LF_UPGRADE))
5877                         ns->ln_flags |= LF_INCONSISTENT;
5878
5879                 if (remove) {
5880                         LASSERT(newdata);
5881
5882                         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, handle);
5883                         if (rc != 0 && rc != -ENOENT && rc != -ENODATA)
5884                                 GOTO(stop, rc);
5885                 }
5886
5887                 if (newdata) {
5888                         rc = linkea_data_new(&ldata,
5889                                         &lfsck_env_info(env)->lti_linkea_buf);
5890                         if (rc != 0)
5891                                 GOTO(stop, rc);
5892                 }
5893
5894                 rc = linkea_add_buf(&ldata, cname, pfid, false);
5895                 if (rc == 0)
5896                         rc = lfsck_links_write(env, obj, &ldata, handle);
5897                 if (rc != 0)
5898                         GOTO(stop, rc);
5899
5900                 count = ldata.ld_leh->leh_reccount;
5901                 if (!S_ISDIR(lfsck_object_type(obj)) ||
5902                     !dt_object_remote(obj)) {
5903                         ns->ln_linkea_repaired++;
5904                         repaired = true;
5905                         log = true;
5906                 }
5907         } else {
5908                 GOTO(stop, rc);
5909         }
5910
5911 stop:
5912         if (dtlocked)
5913                 dt_write_unlock(env, obj);
5914
5915         if (handle != NULL && !IS_ERR(handle))
5916                 dt_trans_stop(env, dev, handle);
5917
5918 out:
5919         lfsck_ibits_unlock(&lh, LCK_EX);
5920
5921         if (!name_is_dot_or_dotdot(lnr->lnr_name, lnr->lnr_namelen) &&
5922             !lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
5923                                              lnr->lnr_name, lnr->lnr_namelen) &&
5924             type != LNIT_BAD_DIRENT) {
5925                 ns->ln_flags |= LF_INCONSISTENT;
5926
5927                 log = false;
5928                 if (dir == NULL) {
5929                         dir = lfsck_assistant_object_load(env, lfsck, lso);
5930                         if (IS_ERR(dir)) {
5931                                 rc = PTR_ERR(dir);
5932
5933                                 GOTO(trace, rc == -ENOENT ? 0 : rc);
5934                         }
5935                 }
5936
5937                 rc = lfsck_namespace_repair_bad_name_hash(env, com, dir,
5938                                                 lnr->lnr_lmv, lnr->lnr_name);
5939                 if (rc == 0)
5940                         bad_hash = true;
5941         }
5942
5943         if (rc >= 0) {
5944                 if (type != LNIT_NONE && dir == NULL) {
5945                         dir = lfsck_assistant_object_load(env, lfsck, lso);
5946                         if (IS_ERR(dir)) {
5947                                 rc = PTR_ERR(dir);
5948
5949                                 GOTO(trace, rc == -ENOENT ? 0 : rc);
5950                         }
5951                 }
5952
5953                 switch (type) {
5954                 case LNIT_BAD_TYPE:
5955                         log = false;
5956                         rc = lfsck_namespace_repair_dirent(env, com, dir,
5957                                         obj, lnr->lnr_name, lnr->lnr_name,
5958                                         lnr->lnr_type, true, false);
5959                         if (rc > 0)
5960                                 repaired = true;
5961                         break;
5962                 case LNIT_BAD_DIRENT:
5963                         log = false;
5964                         /* XXX: This is a bad dirent, we do not know whether
5965                          *      the original name entry reference a regular
5966                          *      file or a directory, then keep the parent's
5967                          *      nlink count unchanged here. */
5968                         rc = lfsck_namespace_repair_dirent(env, com, dir,
5969                                         obj, lnr->lnr_name, lnr->lnr_name,
5970                                         lnr->lnr_type, false, false);
5971                         if (rc > 0)
5972                                 repaired = true;
5973                         break;
5974                 default:
5975                         break;
5976                 }
5977
5978                 if (obj != NULL && count == 1 &&
5979                     S_ISREG(lfsck_object_type(obj)))
5980                         dt_attr_get(env, obj, la);
5981
5982                 /* if new linkea entry is added, the old entry may be stale,
5983                  * check it in phase 2. Sigh, linkea check can only be done
5984                  * locally.
5985                  */
5986                 if (bad_linkea && !remove && !newdata &&
5987                     !dt_object_remote(obj) && count > 1)
5988                         rc = lfsck_namespace_trace_update(env, com,
5989                                                           &lnr->lnr_fid,
5990                                                           LNTF_CHECK_LINKEA,
5991                                                           true);
5992         }
5993
5994 trace:
5995         down_write(&com->lc_sem);
5996         if (rc < 0) {
5997                 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail to handle "
5998                        "the entry: "DFID", parent "DFID", name %.*s: rc = %d\n",
5999                        lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid), PFID(pfid),
6000                        lnr->lnr_namelen, lnr->lnr_name, rc);
6001
6002                 lfsck_namespace_record_failure(env, lfsck, ns);
6003                 if ((rc == -ENOTCONN || rc == -ESHUTDOWN || rc == -EREMCHG ||
6004                      rc == -ETIMEDOUT || rc == -EHOSTDOWN ||
6005                      rc == -EHOSTUNREACH || rc == -EINPROGRESS) &&
6006                     dev != NULL && dev != lfsck->li_bottom)
6007                         lfsck_lad_set_bitmap(env, com, idx);
6008
6009                 if (!(bk->lb_param & LPF_FAILOUT))
6010                         rc = 0;
6011         } else {
6012                 if (repaired) {
6013                         ns->ln_items_repaired++;
6014                         if (log)
6015                                 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant "
6016                                        "repaired the entry: "DFID", parent "DFID
6017                                        ", name %.*s, type %d\n",
6018                                        lfsck_lfsck2name(lfsck),
6019                                        PFID(&lnr->lnr_fid), PFID(pfid),
6020                                        lnr->lnr_namelen, lnr->lnr_name, type);
6021
6022                         switch (type) {
6023                         case LNIT_DANGLING:
6024                                 ns->ln_dangling_repaired++;
6025                                 break;
6026                         case LNIT_BAD_TYPE:
6027                                 ns->ln_bad_type_repaired++;
6028                                 break;
6029                         case LNIT_BAD_DIRENT:
6030                                 ns->ln_dirent_repaired++;
6031                                 break;
6032                         default:
6033                                 break;
6034                         }
6035
6036                         if (bk->lb_param & LPF_DRYRUN &&
6037                             lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
6038                                 lfsck_pos_fill(env, lfsck,
6039                                                &ns->ln_pos_first_inconsistent,
6040                                                false);
6041                 }
6042
6043                 if (bad_hash) {
6044                         ns->ln_name_hash_repaired++;
6045
6046                         /* Not count repeatedly. */
6047                         if (!repaired) {
6048                                 ns->ln_items_repaired++;
6049                                 if (log)
6050                                         CDEBUG(D_LFSCK, "%s: namespace LFSCK "
6051                                                "assistant repaired the entry: "
6052                                                DFID", parent "DFID
6053                                                ", name %.*s\n",
6054                                                lfsck_lfsck2name(lfsck),
6055                                                PFID(&lnr->lnr_fid), PFID(pfid),
6056                                                lnr->lnr_namelen, lnr->lnr_name);
6057                         }
6058
6059                         if (bk->lb_param & LPF_DRYRUN &&
6060                             lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
6061                                 lfsck_pos_fill(env, lfsck,
6062                                                &ns->ln_pos_first_inconsistent,
6063                                                false);
6064                 }
6065
6066                 rc = 0;
6067         }
6068
6069         if (count > 1 || la->la_nlink > 1)
6070                 ns->ln_mul_linked_checked++;
6071
6072         up_write(&com->lc_sem);
6073
6074         if (obj != NULL && !IS_ERR(obj))
6075                 lfsck_object_put(env, obj);
6076
6077         if (dir != NULL && !IS_ERR(dir))
6078                 lfsck_object_put(env, dir);
6079
6080         lad->lad_advance_lock = bad_linkea;
6081
6082         return rc;
6083 }
6084
6085 /**
6086  * Handle one orphan under the backend /lost+found directory
6087  *
6088  * Insert the orphan FID into the namespace LFSCK trace file for further
6089  * processing (via the subsequent namespace LFSCK second-stage scanning).
6090  * At the same time, remove the orphan name entry from backend /lost+found
6091  * directory. There is an interval between the orphan name entry removed
6092  * from the backend /lost+found directory and the orphan FID in the LFSCK
6093  * trace file handled. In such interval, the LFSCK can be reset, then
6094  * all the FIDs recorded in the namespace LFSCK trace file will be dropped.
6095  * To guarantee that the orphans can be found when LFSCK run next time
6096  * without e2fsck again, when remove the orphan name entry, the LFSCK
6097  * will set the orphan's ctime attribute as 1. Since normal applications
6098  * cannot change the object's ctime attribute as 1. Then when LFSCK run
6099  * next time, it can record the object (that ctime is 1) in the namespace
6100  * LFSCK trace file during the first-stage scanning.
6101  *
6102  * \param[in] env       pointer to the thread context
6103  * \param[in] com       pointer to the lfsck component
6104  * \param[in] parent    pointer to the object for the backend /lost+found
6105  * \param[in] ent       pointer to the name entry for the target under the
6106  *                      backend /lost+found
6107  *
6108  * \retval              positive for repaired
6109  * \retval              0 if needs to repair nothing
6110  * \retval              negative error number on failure
6111  */
6112 static int lfsck_namespace_scan_local_lpf_one(const struct lu_env *env,
6113                                               struct lfsck_component *com,
6114                                               struct dt_object *parent,
6115                                               struct lu_dirent *ent)
6116 {
6117         struct lfsck_thread_info        *info   = lfsck_env_info(env);
6118         struct lu_fid                   *key    = &info->lti_fid;
6119         struct lu_attr                  *la     = &info->lti_la;
6120         struct lfsck_instance           *lfsck  = com->lc_lfsck;
6121         struct dt_object                *obj;
6122         struct dt_device                *dev    = lfsck->li_bottom;
6123         struct dt_object                *child  = NULL;
6124         struct thandle                  *th     = NULL;
6125         int                              idx;
6126         int                              rc     = 0;
6127         __u8                             flags  = 0;
6128         bool                             exist  = false;
6129
6130         ENTRY;
6131
6132         child = lfsck_object_find_by_dev(env, dev, &ent->lde_fid);
6133         if (IS_ERR(child))
6134                 RETURN(PTR_ERR(child));
6135
6136         if (!dt_object_exists(child)) {
6137                 CDEBUG(D_LFSCK, "%s: lost+found/%s doesn't exist\n",
6138                        lfsck_lfsck2name(lfsck), ent->lde_name);
6139                 GOTO(out, rc = -ENOENT);
6140         }
6141
6142         LASSERT(!dt_object_remote(child));
6143
6144         idx = lfsck_sub_trace_file_fid2idx(&ent->lde_fid);
6145         obj = com->lc_sub_trace_objs[idx].lsto_obj;
6146         fid_cpu_to_be(key, &ent->lde_fid);
6147         rc = dt_lookup(env, obj, (struct dt_rec *)&flags,
6148                        (const struct dt_key *)key);
6149         if (rc == 0) {
6150                 exist = true;
6151                 flags |= LNTF_CHECK_ORPHAN;
6152         } else if (rc == -ENOENT) {
6153                 flags = LNTF_CHECK_ORPHAN;
6154         } else {
6155                 GOTO(out, rc);
6156         }
6157
6158         th = lfsck_trans_create(env, dev, lfsck);
6159         if (IS_ERR(th))
6160                 GOTO(out, rc = PTR_ERR(th));
6161
6162         /* a1. remove name entry from backend /lost+found */
6163         rc = dt_declare_delete(env, parent,
6164                                (const struct dt_key *)ent->lde_name, th);
6165         if (rc != 0)
6166                 GOTO(stop, rc);
6167
6168         if (S_ISDIR(lfsck_object_type(child))) {
6169                 /* a2. decrease parent's nlink */
6170                 rc = dt_declare_ref_del(env, parent, th);
6171                 if (rc != 0)
6172                         GOTO(stop, rc);
6173         }
6174
6175         if (exist) {
6176                 /* a3. remove child's FID from the LFSCK trace file. */
6177                 rc = dt_declare_delete(env, obj,
6178                                        (const struct dt_key *)key, th);
6179                 if (rc != 0)
6180                         GOTO(stop, rc);
6181         } else {
6182                 /* a4. set child's ctime as 1 */
6183                 memset(la, 0, sizeof(*la));
6184                 la->la_ctime = 1;
6185                 la->la_valid = LA_CTIME;
6186                 rc = dt_declare_attr_set(env, child, la, th);
6187                 if (rc != 0)
6188                         GOTO(stop, rc);
6189         }
6190
6191         /* a5. insert child's FID into the LFSCK trace file. */
6192         rc = dt_declare_insert(env, obj, (const struct dt_rec *)&flags,
6193                                (const struct dt_key *)key, th);
6194         if (rc != 0)
6195                 GOTO(stop, rc);
6196
6197         rc = dt_trans_start_local(env, dev, th);
6198         if (rc != 0)
6199                 GOTO(stop, rc);
6200
6201         /* b1. remove name entry from backend /lost+found */
6202         rc = dt_delete(env, parent, (const struct dt_key *)ent->lde_name, th);
6203         if (rc != 0)
6204                 GOTO(stop, rc);
6205
6206         if (S_ISDIR(lfsck_object_type(child))) {
6207                 /* b2. decrease parent's nlink */
6208                 dt_write_lock(env, parent, 0);
6209                 rc = dt_ref_del(env, parent, th);
6210                 dt_write_unlock(env, parent);
6211                 if (rc != 0)
6212                         GOTO(stop, rc);
6213         }
6214
6215         if (exist) {
6216                 /* a3. remove child's FID from the LFSCK trace file. */
6217                 rc = dt_delete(env, obj, (const struct dt_key *)key, th);
6218                 if (rc != 0)
6219                         GOTO(stop, rc);
6220         } else {
6221                 /* b4. set child's ctime as 1 */
6222                 rc = dt_attr_set(env, child, la, th);
6223                 if (rc != 0)
6224                         GOTO(stop, rc);
6225         }
6226
6227         /* b5. insert child's FID into the LFSCK trace file. */
6228         rc = dt_insert(env, obj, (const struct dt_rec *)&flags,
6229                        (const struct dt_key *)key, th);
6230
6231         GOTO(stop, rc = (rc == 0 ? 1 : rc));
6232
6233 stop:
6234         dt_trans_stop(env, dev, th);
6235
6236 out:
6237         lfsck_object_put(env, child);
6238
6239         return rc;
6240 }
6241
6242 /**
6243  * Handle orphans under the backend /lost+found directory
6244  *
6245  * Some backend checker, such as e2fsck for ldiskfs may find some orphans
6246  * and put them under the backend /lost+found directory that is invisible
6247  * to client. The LFSCK will scan such directory, for the original client
6248  * visible orphans, add their fids into the namespace LFSCK trace file,
6249  * then the subsenquent namespace LFSCK second-stage scanning can handle
6250  * them as other objects to be double scanned: either move back to normal
6251  * namespace, or to the global visible orphan directory:
6252  * /ROOT/.lustre/lost+found/MDTxxxx/
6253  *
6254  * \param[in] env       pointer to the thread context
6255  * \param[in] com       pointer to the lfsck component
6256  */
6257 static void lfsck_namespace_scan_local_lpf(const struct lu_env *env,
6258                                            struct lfsck_component *com)
6259 {
6260         struct lfsck_thread_info        *info   = lfsck_env_info(env);
6261         struct lu_dirent                *ent    =
6262                                         (struct lu_dirent *)info->lti_key;
6263         struct lu_seq_range             *range  = &info->lti_range;
6264         struct lfsck_instance           *lfsck  = com->lc_lfsck;
6265         struct ptlrpc_thread            *thread = &lfsck->li_thread;
6266         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
6267         struct lfsck_namespace          *ns     = com->lc_file_ram;
6268         struct dt_object                *parent;
6269         const struct dt_it_ops          *iops;
6270         struct dt_it                    *di;
6271         struct seq_server_site          *ss     = lfsck_dev_site(lfsck);
6272         __u64                            cookie;
6273         __u32                            idx    = lfsck_dev_idx(lfsck);
6274         int                              rc     = 0;
6275         __u16                            type;
6276         ENTRY;
6277
6278         parent = lfsck_object_find_by_dev(env, lfsck->li_bottom,
6279                                           &LU_BACKEND_LPF_FID);
6280         if (IS_ERR(parent)) {
6281                 CERROR("%s: fail to find backend /lost+found: rc = %ld\n",
6282                        lfsck_lfsck2name(lfsck), PTR_ERR(parent));
6283                 RETURN_EXIT;
6284         }
6285
6286         /* It is normal that the /lost+found does not exist for ZFS backend. */
6287         if (!dt_object_exists(parent))
6288                 GOTO(out, rc = 0);
6289
6290         if (unlikely(!dt_try_as_dir(env, parent)))
6291                 GOTO(out, rc = -ENOTDIR);
6292
6293         CDEBUG(D_LFSCK, "%s: start to scan backend /lost+found\n",
6294                lfsck_lfsck2name(lfsck));
6295
6296         com->lc_new_scanned = 0;
6297         iops = &parent->do_index_ops->dio_it;
6298         di = iops->init(env, parent, LUDA_64BITHASH | LUDA_TYPE);
6299         if (IS_ERR(di))
6300                 GOTO(out, rc = PTR_ERR(di));
6301
6302         rc = iops->load(env, di, 0);
6303         if (rc == 0)
6304                 rc = iops->next(env, di);
6305         else if (rc > 0)
6306                 rc = 0;
6307
6308         while (rc == 0) {
6309                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY3, cfs_fail_val) &&
6310                     unlikely(!thread_is_running(thread)))
6311                         break;
6312
6313                 rc = iops->rec(env, di, (struct dt_rec *)ent,
6314                                LUDA_64BITHASH | LUDA_TYPE);
6315                 if (rc == 0)
6316                         rc = lfsck_unpack_ent(ent, &cookie, &type);
6317
6318                 if (unlikely(rc != 0)) {
6319                         CDEBUG(D_LFSCK, "%s: fail to iterate backend "
6320                                "/lost+found: rc = %d\n",
6321                                lfsck_lfsck2name(lfsck), rc);
6322
6323                         goto skip;
6324                 }
6325
6326                 /* skip dot and dotdot entries */
6327                 if (name_is_dot_or_dotdot(ent->lde_name, ent->lde_namelen))
6328                         goto next;
6329
6330                 if (!fid_seq_in_fldb(fid_seq(&ent->lde_fid)))
6331                         goto skip;
6332
6333                 if (fid_is_norm(&ent->lde_fid)) {
6334                         fld_range_set_mdt(range);
6335                         rc = fld_local_lookup(env, ss->ss_server_fld,
6336                                               fid_seq(&ent->lde_fid), range);
6337                         if (rc != 0)
6338                                 goto skip;
6339                 } else if (idx != 0) {
6340                         /* If the returned FID is IGIF, then there are three
6341                          * possible cases:
6342                          *
6343                          * 1) The object is upgraded from old Lustre-1.8 with
6344                          *    IGIF assigned to such object.
6345                          * 2) The object is a backend local object and is
6346                          *    invisible to client.
6347                          * 3) The object lost its LMV EA, and since there is
6348                          *    no FID-in-dirent for the orphan in the backend
6349                          *    /lost+found directory, then the low layer will
6350                          *    return IGIF for such object.
6351                          *
6352                          * For MDTx (x != 0), it is either case 2) or case 3),
6353                          * but from the LFSCK view, they are indistinguishable.
6354                          * To be safe, the LFSCK will keep it there and report
6355                          * some message, then the adminstrator can handle that
6356                          * furtherly.
6357                          *
6358                          * For MDT0, it is more possible the case 1). The LFSCK
6359                          * will handle the orphan as an upgraded object. */
6360                         CDEBUG(D_LFSCK, "%s: the orphan %.*s with IGIF "DFID
6361                                "in the backend /lost+found on the MDT %04x, "
6362                                "to be safe, skip it.\n",
6363                                lfsck_lfsck2name(lfsck), ent->lde_namelen,
6364                                ent->lde_name, PFID(&ent->lde_fid), idx);
6365                         goto skip;
6366                 }
6367
6368                 rc = lfsck_namespace_scan_local_lpf_one(env, com, parent, ent);
6369
6370 skip:
6371                 down_write(&com->lc_sem);
6372                 com->lc_new_scanned++;
6373                 ns->ln_local_lpf_scanned++;
6374                 if (rc > 0)
6375                         ns->ln_local_lpf_moved++;
6376                 else if (rc == 0)
6377                         ns->ln_local_lpf_skipped++;
6378                 else
6379                         ns->ln_local_lpf_failed++;
6380                 up_write(&com->lc_sem);
6381
6382                 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
6383                         break;
6384
6385 next:
6386                 lfsck_control_speed_by_self(com);
6387                 if (unlikely(!thread_is_running(thread))) {
6388                         rc = 0;
6389                         break;
6390                 }
6391
6392                 rc = iops->next(env, di);
6393         }
6394
6395         iops->put(env, di);
6396         iops->fini(env, di);
6397
6398         EXIT;
6399
6400 out:
6401         CDEBUG(D_LFSCK, "%s: stop to scan backend /lost+found: rc = %d\n",
6402                lfsck_lfsck2name(lfsck), rc);
6403
6404         lfsck_object_put(env, parent);
6405 }
6406
6407 /**
6408  * Rescan the striped directory after the master LMV EA reset.
6409  *
6410  * Sometimes, the master LMV EA of the striped directory maybe lost, so when
6411  * the namespace LFSCK engine scan the striped directory for the first time,
6412  * it will be regarded as a normal directory. As the LFSCK processing, some
6413  * other LFSCK instance on other MDT will find the shard of this striped dir,
6414  * and find that the master MDT-object of the striped directory lost its LMV
6415  * EA, then such remote LFSCK instance will regenerate the master LMV EA and
6416  * notify the LFSCK instance on this MDT to rescan the striped directory.
6417  *
6418  * \param[in] env       pointer to the thread context
6419  * \param[in] com       pointer to the lfsck component
6420  * \param[in] llu       the lfsck_lmv_unit that contains the striped directory
6421  *                      to be rescanned.
6422  *
6423  * \retval              positive number for success
6424  * \retval              0 for LFSCK stopped/paused
6425  * \retval              negative error number on failure
6426  */
6427 static int lfsck_namespace_rescan_striped_dir(const struct lu_env *env,
6428                                               struct lfsck_component *com,
6429                                               struct lfsck_lmv_unit *llu)
6430 {
6431         struct lfsck_thread_info        *info   = lfsck_env_info(env);
6432         struct lfsck_instance           *lfsck  = com->lc_lfsck;
6433         struct lfsck_assistant_data     *lad    = com->lc_data;
6434         struct dt_object                *dir;
6435         const struct dt_it_ops          *iops;
6436         struct dt_it                    *di;
6437         struct lu_dirent                *ent    =
6438                         (struct lu_dirent *)info->lti_key;
6439         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
6440         struct ptlrpc_thread            *thread = &lfsck->li_thread;
6441         struct lfsck_assistant_object   *lso    = NULL;
6442         struct lfsck_namespace_req      *lnr;
6443         struct lfsck_assistant_req      *lar;
6444         int                              rc;
6445         __u16                            type;
6446         ENTRY;
6447
6448         LASSERT(list_empty(&lad->lad_req_list));
6449
6450         lfsck->li_lmv = &llu->llu_lmv;
6451         lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
6452         rc = lfsck_open_dir(env, lfsck, 0);
6453         if (rc != 0)
6454                 RETURN(rc);
6455
6456         dir = lfsck->li_obj_dir;
6457         di = lfsck->li_di_dir;
6458         iops = &dir->do_index_ops->dio_it;
6459         do {
6460                 rc = iops->rec(env, di, (struct dt_rec *)ent,
6461                                lfsck->li_args_dir);
6462                 if (rc == 0)
6463                         rc = lfsck_unpack_ent(ent, &lfsck->li_cookie_dir,
6464                                               &type);
6465
6466                 if (rc != 0) {
6467                         if (bk->lb_param & LPF_FAILOUT)
6468                                 GOTO(out, rc);
6469
6470                         goto next;
6471                 }
6472
6473                 if (name_is_dot_or_dotdot(ent->lde_name, ent->lde_namelen))
6474                         goto next;
6475
6476                 if (lso == NULL) {
6477                         lso = lfsck_assistant_object_init(env,
6478                                 lfsck_dto2fid(dir), NULL,
6479                                 lfsck->li_pos_current.lp_oit_cookie, true);
6480                         if (IS_ERR(lso)) {
6481                                 if (bk->lb_param & LPF_FAILOUT)
6482                                         GOTO(out, rc = PTR_ERR(lso));
6483
6484                                 lso = NULL;
6485                                 goto next;
6486                         }
6487                 }
6488
6489                 lnr = lfsck_namespace_assistant_req_init(lfsck, lso, ent, type);
6490                 if (IS_ERR(lnr)) {
6491                         if (bk->lb_param & LPF_FAILOUT)
6492                                 GOTO(out, rc = PTR_ERR(lnr));
6493
6494                         goto next;
6495                 }
6496
6497                 lar = &lnr->lnr_lar;
6498                 rc = lfsck_namespace_assistant_handler_p1(env, com, lar);
6499                 lfsck_namespace_assistant_req_fini(env, lar);
6500                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
6501                         GOTO(out, rc);
6502
6503                 if (unlikely(!thread_is_running(thread)))
6504                         GOTO(out, rc = 0);
6505
6506 next:
6507                 rc = iops->next(env, di);
6508         } while (rc == 0);
6509
6510 out:
6511         if (lso != NULL && !IS_ERR(lso))
6512                 lfsck_assistant_object_put(env, lso);
6513
6514         lfsck_close_dir(env, lfsck, rc);
6515         if (rc <= 0)
6516                 RETURN(rc);
6517
6518         /* The close_dir() may insert a dummy lnr in the lad->lad_req_list. */
6519         if (list_empty(&lad->lad_req_list))
6520                 RETURN(1);
6521
6522         spin_lock(&lad->lad_lock);
6523         lar = list_entry(lad->lad_req_list.next, struct lfsck_assistant_req,
6524                           lar_list);
6525         list_del_init(&lar->lar_list);
6526         spin_unlock(&lad->lad_lock);
6527
6528         rc = lfsck_namespace_assistant_handler_p1(env, com, lar);
6529         lfsck_namespace_assistant_req_fini(env, lar);
6530
6531         RETURN(rc == 0 ? 1 : rc);
6532 }
6533
6534 static int
6535 lfsck_namespace_double_scan_one_trace_file(const struct lu_env *env,
6536                                            struct lfsck_component *com,
6537                                            struct dt_object *obj, bool first)
6538 {
6539         struct lfsck_instance   *lfsck  = com->lc_lfsck;
6540         struct ptlrpc_thread    *thread = &lfsck->li_thread;
6541         struct lfsck_bookmark   *bk     = &lfsck->li_bookmark_ram;
6542         struct lfsck_namespace  *ns     = com->lc_file_ram;
6543         const struct dt_it_ops  *iops   = &obj->do_index_ops->dio_it;
6544         struct dt_object        *target;
6545         struct dt_it            *di;
6546         struct dt_key           *key;
6547         struct lu_fid            fid;
6548         int                      rc;
6549         __u8                     flags  = 0;
6550         ENTRY;
6551
6552         di = iops->init(env, obj, 0);
6553         if (IS_ERR(di))
6554                 RETURN(PTR_ERR(di));
6555
6556         if (first)
6557                 fid_cpu_to_be(&fid, &ns->ln_fid_latest_scanned_phase2);
6558         else
6559                 fid_zero(&fid);
6560         rc = iops->get(env, di, (const struct dt_key *)&fid);
6561         if (rc < 0)
6562                 GOTO(fini, rc);
6563
6564         if (first) {
6565                 /* The start one either has been processed or does not exist,
6566                  * skip it. */
6567                 rc = iops->next(env, di);
6568                 if (rc != 0)
6569                         GOTO(put, rc);
6570         }
6571
6572         do {
6573                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY3, cfs_fail_val) &&
6574                     unlikely(!thread_is_running(thread)))
6575                         GOTO(put, rc = 0);
6576
6577                 key = iops->key(env, di);
6578                 if (IS_ERR(key)) {
6579                         rc = PTR_ERR(key);
6580                         if (rc == -ENOENT)
6581                                 GOTO(put, rc = 1);
6582
6583                         goto checkpoint;
6584                 }
6585
6586                 fid_be_to_cpu(&fid, (const struct lu_fid *)key);
6587                 if (!fid_is_sane(&fid)) {
6588                         rc = 0;
6589                         goto checkpoint;
6590                 }
6591
6592                 target = lfsck_object_find_bottom(env, lfsck, &fid);
6593                 if (IS_ERR(target)) {
6594                         rc = PTR_ERR(target);
6595                         goto checkpoint;
6596                 }
6597
6598                 if (dt_object_exists(target)) {
6599                         rc = iops->rec(env, di, (struct dt_rec *)&flags, 0);
6600                         if (rc == 0) {
6601                                 rc = lfsck_namespace_double_scan_one(env, com,
6602                                                                 target, flags);
6603                                 if (rc == -ENOENT)
6604                                         rc = 0;
6605                         }
6606                 }
6607
6608                 lfsck_object_put(env, target);
6609
6610 checkpoint:
6611                 down_write(&com->lc_sem);
6612                 com->lc_new_checked++;
6613                 com->lc_new_scanned++;
6614                 if (rc >= 0)
6615                         ns->ln_fid_latest_scanned_phase2 = fid;
6616
6617                 if (rc > 0)
6618                         ns->ln_objs_repaired_phase2++;
6619                 else if (rc < 0)
6620                         ns->ln_objs_failed_phase2++;
6621                 up_write(&com->lc_sem);
6622
6623                 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
6624                         GOTO(put, rc);
6625
6626                 if (unlikely(com->lc_time_next_checkpoint <=
6627                              ktime_get_seconds()) &&
6628                     com->lc_new_checked != 0) {
6629                         down_write(&com->lc_sem);
6630                         ns->ln_run_time_phase2 += ktime_get_seconds() -
6631                                                   com->lc_time_last_checkpoint;
6632                         ns->ln_time_last_checkpoint = ktime_get_real_seconds();
6633                         ns->ln_objs_checked_phase2 += com->lc_new_checked;
6634                         com->lc_new_checked = 0;
6635                         lfsck_namespace_store(env, com);
6636                         up_write(&com->lc_sem);
6637
6638                         com->lc_time_last_checkpoint = ktime_get_seconds();
6639                         com->lc_time_next_checkpoint =
6640                                 com->lc_time_last_checkpoint +
6641                                 LFSCK_CHECKPOINT_INTERVAL;
6642                 }
6643
6644                 lfsck_control_speed_by_self(com);
6645                 if (unlikely(!thread_is_running(thread)))
6646                         GOTO(put, rc = 0);
6647
6648                 rc = iops->next(env, di);
6649         } while (rc == 0);
6650
6651         GOTO(put, rc);
6652
6653 put:
6654         iops->put(env, di);
6655
6656 fini:
6657         iops->fini(env, di);
6658
6659         return rc;
6660 }
6661
6662 static int lfsck_namespace_assistant_handler_p2(const struct lu_env *env,
6663                                                 struct lfsck_component *com)
6664 {
6665         struct lfsck_instance   *lfsck  = com->lc_lfsck;
6666         struct lfsck_namespace  *ns     = com->lc_file_ram;
6667         int                      rc;
6668         int                      i;
6669         ENTRY;
6670
6671         while (!list_empty(&lfsck->li_list_lmv)) {
6672                 struct lfsck_lmv_unit *llu;
6673
6674                 spin_lock(&lfsck->li_lock);
6675                 llu = list_entry(lfsck->li_list_lmv.next,
6676                                  struct lfsck_lmv_unit, llu_link);
6677                 list_del_init(&llu->llu_link);
6678                 spin_unlock(&lfsck->li_lock);
6679
6680                 rc = lfsck_namespace_rescan_striped_dir(env, com, llu);
6681                 if (rc <= 0)
6682                         RETURN(rc);
6683         }
6684
6685         CDEBUG(D_LFSCK, "%s: namespace LFSCK phase2 scan start\n",
6686                lfsck_lfsck2name(lfsck));
6687
6688         lfsck_namespace_scan_local_lpf(env, com);
6689
6690         com->lc_new_checked = 0;
6691         com->lc_new_scanned = 0;
6692         com->lc_time_last_checkpoint = ktime_get_seconds();
6693         com->lc_time_next_checkpoint = com->lc_time_last_checkpoint +
6694                                        LFSCK_CHECKPOINT_INTERVAL;
6695
6696         i = lfsck_sub_trace_file_fid2idx(&ns->ln_fid_latest_scanned_phase2);
6697         rc = lfsck_namespace_double_scan_one_trace_file(env, com,
6698                                 com->lc_sub_trace_objs[i].lsto_obj, true);
6699         while (rc > 0 && ++i < LFSCK_STF_COUNT)
6700                 rc = lfsck_namespace_double_scan_one_trace_file(env, com,
6701                                 com->lc_sub_trace_objs[i].lsto_obj, false);
6702
6703         CDEBUG(D_LFSCK, "%s: namespace LFSCK phase2 scan stop at the No. %d "
6704                "trace file: rc = %d\n", lfsck_lfsck2name(lfsck), i, rc);
6705
6706         RETURN(rc);
6707 }
6708
6709 static void lfsck_namespace_assistant_fill_pos(const struct lu_env *env,
6710                                                struct lfsck_component *com,
6711                                                struct lfsck_position *pos)
6712 {
6713         struct lfsck_assistant_data     *lad = com->lc_data;
6714         struct lfsck_namespace_req      *lnr;
6715
6716         if (((struct lfsck_namespace *)(com->lc_file_ram))->ln_status !=
6717             LS_SCANNING_PHASE1)
6718                 return;
6719
6720         if (list_empty(&lad->lad_req_list))
6721                 return;
6722
6723         lnr = list_entry(lad->lad_req_list.next,
6724                          struct lfsck_namespace_req,
6725                          lnr_lar.lar_list);
6726         pos->lp_oit_cookie = lnr->lnr_lar.lar_parent->lso_oit_cookie;
6727         pos->lp_dir_cookie = lnr->lnr_dir_cookie - 1;
6728         pos->lp_dir_parent = lnr->lnr_lar.lar_parent->lso_fid;
6729 }
6730
6731 static int lfsck_namespace_double_scan_result(const struct lu_env *env,
6732                                               struct lfsck_component *com,
6733                                               int rc)
6734 {
6735         struct lfsck_instance   *lfsck  = com->lc_lfsck;
6736         struct lfsck_namespace  *ns     = com->lc_file_ram;
6737
6738         down_write(&com->lc_sem);
6739         ns->ln_run_time_phase2 += ktime_get_seconds() -
6740                                   com->lc_time_last_checkpoint;
6741         ns->ln_time_last_checkpoint = ktime_get_real_seconds();
6742         ns->ln_objs_checked_phase2 += com->lc_new_checked;
6743         com->lc_new_checked = 0;
6744
6745         if (rc > 0) {
6746                 if (ns->ln_flags & LF_INCOMPLETE)
6747                         ns->ln_status = LS_PARTIAL;
6748                 else
6749                         ns->ln_status = LS_COMPLETED;
6750                 ns->ln_flags &= ~LF_SCANNED_ONCE;
6751                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN))
6752                         ns->ln_flags &= ~LF_INCONSISTENT;
6753                 ns->ln_time_last_complete = ns->ln_time_last_checkpoint;
6754                 ns->ln_success_count++;
6755         } else if (rc == 0) {
6756                 if (lfsck->li_status != 0)
6757                         ns->ln_status = lfsck->li_status;
6758                 else
6759                         ns->ln_status = LS_STOPPED;
6760         } else {
6761                 ns->ln_status = LS_FAILED;
6762         }
6763
6764         rc = lfsck_namespace_store(env, com);
6765         up_write(&com->lc_sem);
6766
6767         return rc;
6768 }
6769
6770 static int
6771 lfsck_namespace_assistant_sync_failures_interpret(const struct lu_env *env,
6772                                                   struct ptlrpc_request *req,
6773                                                   void *args, int rc)
6774 {
6775         if (rc == 0) {
6776                 struct lfsck_async_interpret_args *laia = args;
6777                 struct lfsck_tgt_desc             *ltd  = laia->laia_ltd;
6778
6779                 ltd->ltd_synced_failures = 1;
6780         }
6781
6782         return 0;
6783 }
6784
6785 /**
6786  * Notify remote LFSCK instances about former failures.
6787  *
6788  * The local LFSCK instance has recorded which MDTs have ever failed to respond
6789  * some LFSCK verification requests (maybe because of network issues or the MDT
6790  * itself trouble). During the respond gap the MDT may missed some name entries
6791  * verification, then the MDT cannot know whether related MDT-objects have been
6792  * referenced by related name entries or not, then in the second-stage scanning,
6793  * these MDT-objects will be regarded as orphan, if the MDT-object contains bad
6794  * linkEA for back reference, then it will misguide the LFSCK to generate wrong
6795  * name entry for repairing the orphan.
6796  *
6797  * To avoid above trouble, when layout LFSCK finishes the first-stage scanning,
6798  * it will scan the bitmap for the ever failed MDTs, and notify them that they
6799  * have ever missed some name entries verification and should skip the handling
6800  * for orphan MDT-objects.
6801  *
6802  * \param[in] env       pointer to the thread context
6803  * \param[in] com       pointer to the lfsck component
6804  * \param[in] lr        pointer to the lfsck request
6805  */
6806 static void lfsck_namespace_assistant_sync_failures(const struct lu_env *env,
6807                                                     struct lfsck_component *com,
6808                                                     struct lfsck_request *lr)
6809 {
6810         struct lfsck_async_interpret_args *laia  =
6811                                 &lfsck_env_info(env)->lti_laia2;
6812         struct lfsck_assistant_data       *lad   = com->lc_data;
6813         struct lfsck_namespace            *ns    = com->lc_file_ram;
6814         struct lfsck_instance             *lfsck = com->lc_lfsck;
6815         struct lfsck_tgt_descs            *ltds  = &lfsck->li_mdt_descs;
6816         struct lfsck_tgt_desc             *ltd;
6817         struct ptlrpc_request_set         *set;
6818         __u32                              idx;
6819         int                                rc    = 0;
6820         ENTRY;
6821
6822         if (!test_bit(LAD_INCOMPLETE, &lad->lad_flags))
6823                 RETURN_EXIT;
6824
6825         set = ptlrpc_prep_set();
6826         if (set == NULL)
6827                 GOTO(out, rc = -ENOMEM);
6828
6829         lr->lr_flags2 = ns->ln_flags | LF_INCOMPLETE;
6830         memset(laia, 0, sizeof(*laia));
6831         lad->lad_touch_gen++;
6832
6833         down_read(&ltds->ltd_rw_sem);
6834         cfs_foreach_bit(lad->lad_bitmap, idx) {
6835                 ltd = lfsck_ltd2tgt(ltds, idx);
6836                 if (unlikely(!ltd))
6837                         continue;
6838
6839                 laia->laia_ltd = ltd;
6840                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
6841                         lfsck_namespace_assistant_sync_failures_interpret,
6842                         laia, LFSCK_NOTIFY);
6843                 if (rc != 0)
6844                         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail "
6845                                "to sync failure with MDT %x: rc = %d\n",
6846                                lfsck_lfsck2name(lfsck), ltd->ltd_index, rc);
6847         }
6848         up_read(&ltds->ltd_rw_sem);
6849
6850         rc = ptlrpc_set_wait(env, set);
6851         ptlrpc_set_destroy(set);
6852
6853         GOTO(out, rc);
6854
6855 out:
6856         if (rc != 0)
6857                 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail "
6858                        "to sync failure with MDTs, and related MDTs "
6859                        "may handle orphan improperly: rc = %d\n",
6860                        lfsck_lfsck2name(lfsck), rc);
6861
6862         EXIT;
6863 }
6864
6865 const struct lfsck_assistant_operations lfsck_namespace_assistant_ops = {
6866         .la_handler_p1          = lfsck_namespace_assistant_handler_p1,
6867         .la_handler_p2          = lfsck_namespace_assistant_handler_p2,
6868         .la_fill_pos            = lfsck_namespace_assistant_fill_pos,
6869         .la_double_scan_result  = lfsck_namespace_double_scan_result,
6870         .la_req_fini            = lfsck_namespace_assistant_req_fini,
6871         .la_sync_failures       = lfsck_namespace_assistant_sync_failures,
6872 };
6873
6874 /**
6875  * Verify the specified linkEA entry for the given directory object.
6876  * If the object has no such linkEA entry or it has more other linkEA
6877  * entries, then re-generate the linkEA with the given information.
6878  *
6879  * \param[in] env       pointer to the thread context
6880  * \param[in] obj       pointer to the dt_object to be handled
6881  * \param[in] cname     the name for the child in the parent directory
6882  * \param[in] pfid      the parent directory's FID for the linkEA
6883  *
6884  * \retval              0 for success
6885  * \retval              negative error number on failure
6886  */
6887 int lfsck_verify_linkea(const struct lu_env *env, struct lfsck_instance *lfsck,
6888                         struct dt_object *obj, const struct lu_name *cname,
6889                         const struct lu_fid *pfid)
6890 {
6891         struct dt_device        *dev    = lfsck_obj2dev(obj);
6892         struct linkea_data       ldata  = { NULL };
6893         struct lu_buf            linkea_buf;
6894         struct thandle          *th;
6895         int                      rc;
6896         int                      fl     = LU_XATTR_CREATE;
6897         bool                     dirty  = false;
6898
6899         ENTRY;
6900
6901         if (!dt_object_exists(obj))
6902                 RETURN(-ENOENT);
6903
6904         if (!S_ISDIR(lfsck_object_type(obj)))
6905                 RETURN(-ENOTDIR);
6906
6907         rc = lfsck_links_read_with_rec(env, obj, &ldata);
6908         if (rc == -ENODATA) {
6909                 dirty = true;
6910         } else if (rc == 0) {
6911                 fl = LU_XATTR_REPLACE;
6912                 if (ldata.ld_leh->leh_reccount != 1) {
6913                         dirty = true;
6914                 } else {
6915                         rc = linkea_links_find(&ldata, cname, pfid);
6916                         if (rc != 0)
6917                                 dirty = true;
6918                 }
6919         }
6920
6921         if (!dirty)
6922                 RETURN(rc);
6923
6924         rc = linkea_links_new(&ldata, &lfsck_env_info(env)->lti_linkea_buf,
6925                               cname, pfid);
6926         if (rc != 0)
6927                 RETURN(rc);
6928
6929         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
6930                        ldata.ld_leh->leh_len);
6931         th = lfsck_trans_create(env, dev, lfsck);
6932         if (IS_ERR(th))
6933                 RETURN(PTR_ERR(th));
6934
6935         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
6936                                   XATTR_NAME_LINK, fl, th);
6937         if (rc != 0)
6938                 GOTO(stop, rc);
6939
6940         rc = dt_trans_start_local(env, dev, th);
6941         if (rc != 0)
6942                 GOTO(stop, rc);
6943
6944         dt_write_lock(env, obj, 0);
6945         rc = dt_xattr_set(env, obj, &linkea_buf,
6946                           XATTR_NAME_LINK, fl, th);
6947         dt_write_unlock(env, obj);
6948
6949         GOTO(stop, rc);
6950
6951 stop:
6952         dt_trans_stop(env, dev, th);
6953         return rc;
6954 }
6955
6956 /**
6957  * Get the name and parent directory's FID from the first linkEA entry.
6958  *
6959  * \param[in] env       pointer to the thread context
6960  * \param[in] obj       pointer to the object which get linkEA from
6961  * \param[out] name     pointer to the buffer to hold the name
6962  *                      in the first linkEA entry
6963  * \param[out] pfid     pointer to the buffer to hold the parent
6964  *                      directory's FID in the first linkEA entry
6965  *
6966  * \retval              0 for success
6967  * \retval              negative error number on failure
6968  */
6969 int lfsck_links_get_first(const struct lu_env *env, struct dt_object *obj,
6970                           char *name, struct lu_fid *pfid)
6971 {
6972         struct lu_name           *cname = &lfsck_env_info(env)->lti_name;
6973         struct linkea_data        ldata = { NULL };
6974         int                       rc;
6975
6976         rc = lfsck_links_read_with_rec(env, obj, &ldata);
6977         if (rc)
6978                 return rc;
6979
6980         linkea_first_entry(&ldata);
6981         linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen, cname, pfid);
6982         if (!linkea_entry_is_valid(&ldata, cname, pfid))
6983                 return -EINVAL;
6984
6985         /* To guarantee the 'name' is terminated with '0'. */
6986         memcpy(name, cname->ln_name, cname->ln_namelen);
6987         name[cname->ln_namelen] = 0;
6988
6989         return 0;
6990 }
6991
6992 /**
6993  * Update the object's name entry with the given FID.
6994  *
6995  * \param[in] env       pointer to the thread context
6996  * \param[in] lfsck     pointer to the lfsck instance
6997  * \param[in] dir       pointer to the directory that holds
6998  *                      the name entry
6999  * \param[in] name      the name for the entry to be updated
7000  * \param[in] fid       the new FID for the name entry referenced
7001  * \param[in] type      the type for the name entry to be updated
7002  *
7003  * \retval              0 for success
7004  * \retval              negative error number on failure
7005  */
7006 int lfsck_update_name_entry(const struct lu_env *env,
7007                             struct lfsck_instance *lfsck,
7008                             struct dt_object *dir, const char *name,
7009                             const struct lu_fid *fid, __u32 type)
7010 {
7011         struct lfsck_thread_info *info   = lfsck_env_info(env);
7012         struct dt_insert_rec     *rec    = &info->lti_dt_rec;
7013         struct lfsck_lock_handle *llh    = &info->lti_llh;
7014         struct dt_device         *dev    = lfsck_obj2dev(dir);
7015         struct thandle           *th;
7016         int                       rc;
7017         bool                      exists = true;
7018         ENTRY;
7019
7020         rc = lfsck_lock(env, lfsck, dir, name, llh,
7021                         MDS_INODELOCK_UPDATE, LCK_PW);
7022         if (rc != 0)
7023                 RETURN(rc);
7024
7025         th = lfsck_trans_create(env, dev, lfsck);
7026         if (IS_ERR(th))
7027                 GOTO(unlock, rc = PTR_ERR(th));
7028
7029         rc = dt_declare_delete(env, dir, (const struct dt_key *)name, th);
7030         if (rc != 0)
7031                 GOTO(stop, rc);
7032
7033         rec->rec_type = type;
7034         rec->rec_fid = fid;
7035         rc = dt_declare_insert(env, dir, (const struct dt_rec *)rec,
7036                                (const struct dt_key *)name, th);
7037         if (rc != 0)
7038                 GOTO(stop, rc);
7039
7040         rc = dt_declare_ref_add(env, dir, th);
7041         if (rc != 0)
7042                 GOTO(stop, rc);
7043
7044         rc = dt_trans_start_local(env, dev, th);
7045         if (rc != 0)
7046                 GOTO(stop, rc);
7047
7048         rc = dt_delete(env, dir, (const struct dt_key *)name, th);
7049         if (rc == -ENOENT) {
7050                 exists = false;
7051                 rc = 0;
7052         }
7053
7054         if (rc != 0)
7055                 GOTO(stop, rc);
7056
7057         rc = dt_insert(env, dir, (const struct dt_rec *)rec,
7058                        (const struct dt_key *)name, th);
7059         if (rc == 0 && S_ISDIR(type) && !exists) {
7060                 dt_write_lock(env, dir, 0);
7061                 rc = dt_ref_add(env, dir, th);
7062                 dt_write_unlock(env, dir);
7063         }
7064
7065         GOTO(stop, rc);
7066
7067 stop:
7068         dt_trans_stop(env, dev, th);
7069
7070 unlock:
7071         lfsck_unlock(llh);
7072         CDEBUG(D_LFSCK, "%s: update name entry "DFID"/%s with the FID "DFID
7073                " and the type %o: rc = %d\n", lfsck_lfsck2name(lfsck),
7074                PFID(lfsck_dto2fid(dir)), name, PFID(fid), type, rc);
7075
7076         return rc;
7077 }
7078
7079 int lfsck_namespace_setup(const struct lu_env *env,
7080                           struct lfsck_instance *lfsck)
7081 {
7082         struct lfsck_component  *com;
7083         struct lfsck_namespace  *ns;
7084         struct dt_object        *root = NULL;
7085         struct dt_object        *obj;
7086         int                      i;
7087         int                      rc;
7088         ENTRY;
7089
7090         LASSERT(lfsck->li_master);
7091
7092         OBD_ALLOC_PTR(com);
7093         if (com == NULL)
7094                 RETURN(-ENOMEM);
7095
7096         INIT_LIST_HEAD(&com->lc_link);
7097         INIT_LIST_HEAD(&com->lc_link_dir);
7098         init_rwsem(&com->lc_sem);
7099         atomic_set(&com->lc_ref, 1);
7100         com->lc_lfsck = lfsck;
7101         com->lc_type = LFSCK_TYPE_NAMESPACE;
7102         com->lc_ops = &lfsck_namespace_ops;
7103         com->lc_data = lfsck_assistant_data_init(
7104                         &lfsck_namespace_assistant_ops,
7105                         LFSCK_NAMESPACE);
7106         if (com->lc_data == NULL)
7107                 GOTO(out, rc = -ENOMEM);
7108
7109         com->lc_file_size = sizeof(struct lfsck_namespace);
7110         OBD_ALLOC(com->lc_file_ram, com->lc_file_size);
7111         if (com->lc_file_ram == NULL)
7112                 GOTO(out, rc = -ENOMEM);
7113
7114         OBD_ALLOC(com->lc_file_disk, com->lc_file_size);
7115         if (com->lc_file_disk == NULL)
7116                 GOTO(out, rc = -ENOMEM);
7117
7118         for (i = 0; i < LFSCK_STF_COUNT; i++)
7119                 mutex_init(&com->lc_sub_trace_objs[i].lsto_mutex);
7120
7121         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
7122         if (IS_ERR(root))
7123                 GOTO(out, rc = PTR_ERR(root));
7124
7125         if (unlikely(!dt_try_as_dir(env, root)))
7126                 GOTO(out, rc = -ENOTDIR);
7127
7128         obj = local_index_find_or_create(env, lfsck->li_los, root,
7129                                          LFSCK_NAMESPACE,
7130                                          S_IFREG | S_IRUGO | S_IWUSR,
7131                                          &dt_lfsck_namespace_features);
7132         if (IS_ERR(obj))
7133                 GOTO(out, rc = PTR_ERR(obj));
7134
7135         com->lc_obj = obj;
7136         rc = lfsck_namespace_load(env, com);
7137         if (rc == -ENODATA) {
7138                 rc = lfsck_namespace_init(env, com);
7139         } else if (rc < 0) {
7140                 rc = lfsck_namespace_reset(env, com, true);
7141         } else {
7142                 rc = lfsck_load_sub_trace_files(env, com,
7143                         &dt_lfsck_namespace_features, LFSCK_NAMESPACE, false);
7144                 if (rc)
7145                         rc = lfsck_namespace_reset(env, com, true);
7146         }
7147         if (rc != 0)
7148                 GOTO(out, rc);
7149
7150         ns = com->lc_file_ram;
7151         switch (ns->ln_status) {
7152         case LS_INIT:
7153         case LS_COMPLETED:
7154         case LS_FAILED:
7155         case LS_STOPPED:
7156                 spin_lock(&lfsck->li_lock);
7157                 list_add_tail(&com->lc_link, &lfsck->li_list_idle);
7158                 spin_unlock(&lfsck->li_lock);
7159                 break;
7160         default:
7161                 CERROR("%s: unknown lfsck_namespace status %d\n",
7162                        lfsck_lfsck2name(lfsck), ns->ln_status);
7163                 fallthrough;
7164         case LS_SCANNING_PHASE1:
7165         case LS_SCANNING_PHASE2:
7166                 /* No need to store the status to disk right now.
7167                  * If the system crashed before the status stored,
7168                  * it will be loaded back when next time. */
7169                 ns->ln_status = LS_CRASHED;
7170                 fallthrough;
7171         case LS_PAUSED:
7172         case LS_CRASHED:
7173                 spin_lock(&lfsck->li_lock);
7174                 list_add_tail(&com->lc_link, &lfsck->li_list_scan);
7175                 list_add_tail(&com->lc_link_dir, &lfsck->li_list_dir);
7176                 spin_unlock(&lfsck->li_lock);
7177                 break;
7178         }
7179
7180         GOTO(out, rc = 0);
7181
7182 out:
7183         if (root != NULL && !IS_ERR(root))
7184                 lfsck_object_put(env, root);
7185         if (rc != 0) {
7186                 lfsck_component_cleanup(env, com);
7187                 CERROR("%s: fail to init namespace LFSCK component: rc = %d\n",
7188                        lfsck_lfsck2name(lfsck), rc);
7189         }
7190         return rc;
7191 }