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, 2014, 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 <lustre/lustre_idl.h>
  34 #include <lu_object.h>
  35 #include <dt_object.h>
  36 #include <md_object.h>
  37 #include <lustre_fid.h>
  38 #include <lustre_lib.h>
  39 #include <lustre_net.h>
  40 #include <lustre/lustre_user.h>
  41
  42 #include "lfsck_internal.h"
  43
  44 #define LFSCK_NAMESPACE_MAGIC_V1        0xA0629D03
  45 #define LFSCK_NAMESPACE_MAGIC_V2        0xA0621A0B
  46
  47 /* For Lustre-2.x (x <= 6), the namespace LFSCK used LFSCK_NAMESPACE_MAGIC_V1
  48  * as the trace file magic. When downgrade to such old release, the old LFSCK
  49  * will not recognize the new LFSCK_NAMESPACE_MAGIC_V2 in the new trace file,
  50  * then it will reset the whole LFSCK, and will not cause start failure. The
  51  * similar case will happen when upgrade from such old release. */
  52 #define LFSCK_NAMESPACE_MAGIC           LFSCK_NAMESPACE_MAGIC_V2
  53
  54 enum lfsck_nameentry_check {
  55         LFSCK_NAMEENTRY_DEAD            = 1, /* The object has been unlinked. */
  56         LFSCK_NAMEENTRY_REMOVED         = 2, /* The entry has been removed. */
  57         LFSCK_NAMEENTRY_RECREATED       = 3, /* The entry has been recreated. */
  58 };
  59
  60 static struct lfsck_namespace_req *
  61 lfsck_namespace_assistant_req_init(struct lfsck_instance *lfsck,
  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_fid = *lfsck_dto2fid(lfsck->li_obj_dir);
  74         lnr->lnr_lmv = lfsck_lmv_get(lfsck->li_lmv);
  75         lnr->lnr_fid = ent->lde_fid;
  76         lnr->lnr_oit_cookie = lfsck->li_pos_current.lp_oit_cookie;
  77         lnr->lnr_dir_cookie = ent->lde_hash;
  78         lnr->lnr_attr = ent->lde_attrs;
  79         lnr->lnr_size = size;
  80         lnr->lnr_type = type;
  81         lnr->lnr_namelen = ent->lde_namelen;
  82         memcpy(lnr->lnr_name, ent->lde_name, ent->lde_namelen);
  83
  84         return lnr;
  85 }
  86
  87 static void lfsck_namespace_assistant_req_fini(const struct lu_env *env,
  88                                                struct lfsck_assistant_req *lar)
  89 {
  90         struct lfsck_namespace_req *lnr =
  91                         container_of0(lar, struct lfsck_namespace_req, lnr_lar);
  92
  93         if (lnr->lnr_lmv != NULL)
  94                 lfsck_lmv_put(env, lnr->lnr_lmv);
  95
  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 = le32_to_cpu(src->ln_run_time_phase1);
 107         dst->ln_run_time_phase2 = le32_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 }
 167
 168 static void lfsck_namespace_cpu_to_le(struct lfsck_namespace *dst,
 169                                       struct lfsck_namespace *src)
 170 {
 171         dst->ln_magic = cpu_to_le32(src->ln_magic);
 172         dst->ln_status = cpu_to_le32(src->ln_status);
 173         dst->ln_flags = cpu_to_le32(src->ln_flags);
 174         dst->ln_success_count = cpu_to_le32(src->ln_success_count);
 175         dst->ln_run_time_phase1 = cpu_to_le32(src->ln_run_time_phase1);
 176         dst->ln_run_time_phase2 = cpu_to_le32(src->ln_run_time_phase2);
 177         dst->ln_time_last_complete = cpu_to_le64(src->ln_time_last_complete);
 178         dst->ln_time_latest_start = cpu_to_le64(src->ln_time_latest_start);
 179         dst->ln_time_last_checkpoint =
 180                                 cpu_to_le64(src->ln_time_last_checkpoint);
 181         lfsck_position_cpu_to_le(&dst->ln_pos_latest_start,
 182                                  &src->ln_pos_latest_start);
 183         lfsck_position_cpu_to_le(&dst->ln_pos_last_checkpoint,
 184                                  &src->ln_pos_last_checkpoint);
 185         lfsck_position_cpu_to_le(&dst->ln_pos_first_inconsistent,
 186                                  &src->ln_pos_first_inconsistent);
 187         dst->ln_items_checked = cpu_to_le64(src->ln_items_checked);
 188         dst->ln_items_repaired = cpu_to_le64(src->ln_items_repaired);
 189         dst->ln_items_failed = cpu_to_le64(src->ln_items_failed);
 190         dst->ln_dirs_checked = cpu_to_le64(src->ln_dirs_checked);
 191         dst->ln_objs_checked_phase2 = cpu_to_le64(src->ln_objs_checked_phase2);
 192         dst->ln_objs_repaired_phase2 =
 193                                 cpu_to_le64(src->ln_objs_repaired_phase2);
 194         dst->ln_objs_failed_phase2 = cpu_to_le64(src->ln_objs_failed_phase2);
 195         dst->ln_objs_nlink_repaired = cpu_to_le64(src->ln_objs_nlink_repaired);
 196         fid_cpu_to_le(&dst->ln_fid_latest_scanned_phase2,
 197                       &src->ln_fid_latest_scanned_phase2);
 198         dst->ln_dirent_repaired = cpu_to_le64(src->ln_dirent_repaired);
 199         dst->ln_linkea_repaired = cpu_to_le64(src->ln_linkea_repaired);
 200         dst->ln_mul_linked_checked = cpu_to_le64(src->ln_mul_linked_checked);
 201         dst->ln_mul_linked_repaired = cpu_to_le64(src->ln_mul_linked_repaired);
 202         dst->ln_unknown_inconsistency =
 203                                 cpu_to_le64(src->ln_unknown_inconsistency);
 204         dst->ln_unmatched_pairs_repaired =
 205                                 cpu_to_le64(src->ln_unmatched_pairs_repaired);
 206         dst->ln_dangling_repaired = cpu_to_le64(src->ln_dangling_repaired);
 207         dst->ln_mul_ref_repaired = cpu_to_le64(src->ln_mul_ref_repaired);
 208         dst->ln_bad_type_repaired = cpu_to_le64(src->ln_bad_type_repaired);
 209         dst->ln_lost_dirent_repaired =
 210                                 cpu_to_le64(src->ln_lost_dirent_repaired);
 211         dst->ln_striped_dirs_scanned =
 212                                 cpu_to_le64(src->ln_striped_dirs_scanned);
 213         dst->ln_striped_dirs_repaired =
 214                                 cpu_to_le64(src->ln_striped_dirs_repaired);
 215         dst->ln_striped_dirs_failed =
 216                                 cpu_to_le64(src->ln_striped_dirs_failed);
 217         dst->ln_striped_dirs_disabled =
 218                                 cpu_to_le64(src->ln_striped_dirs_disabled);
 219         dst->ln_striped_dirs_skipped =
 220                                 cpu_to_le64(src->ln_striped_dirs_skipped);
 221         dst->ln_striped_shards_scanned =
 222                                 cpu_to_le64(src->ln_striped_shards_scanned);
 223         dst->ln_striped_shards_repaired =
 224                                 cpu_to_le64(src->ln_striped_shards_repaired);
 225         dst->ln_striped_shards_failed =
 226                                 cpu_to_le64(src->ln_striped_shards_failed);
 227         dst->ln_striped_shards_skipped =
 228                                 cpu_to_le64(src->ln_striped_shards_skipped);
 229         dst->ln_name_hash_repaired = cpu_to_le64(src->ln_name_hash_repaired);
 230         dst->ln_local_lpf_scanned = cpu_to_le64(src->ln_local_lpf_scanned);
 231         dst->ln_local_lpf_moved = cpu_to_le64(src->ln_local_lpf_moved);
 232         dst->ln_local_lpf_skipped = cpu_to_le64(src->ln_local_lpf_skipped);
 233         dst->ln_local_lpf_failed = cpu_to_le64(src->ln_local_lpf_failed);
 234         dst->ln_bitmap_size = cpu_to_le32(src->ln_bitmap_size);
 235 }
 236
 237 static void lfsck_namespace_record_failure(const struct lu_env *env,
 238                                            struct lfsck_instance *lfsck,
 239                                            struct lfsck_namespace *ns)
 240 {
 241         struct lfsck_position pos;
 242
 243         ns->ln_items_failed++;
 244         lfsck_pos_fill(env, lfsck, &pos, false);
 245         if (lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent) ||
 246             lfsck_pos_is_eq(&pos, &ns->ln_pos_first_inconsistent) < 0) {
 247                 ns->ln_pos_first_inconsistent = pos;
 248
 249                 CDEBUG(D_LFSCK, "%s: namespace LFSCK hit first non-repaired "
 250                        "inconsistency at the pos ["LPU64", "DFID", "LPX64"]\n",
 251                        lfsck_lfsck2name(lfsck),
 252                        ns->ln_pos_first_inconsistent.lp_oit_cookie,
 253                        PFID(&ns->ln_pos_first_inconsistent.lp_dir_parent),
 254                        ns->ln_pos_first_inconsistent.lp_dir_cookie);
 255         }
 256 }
 257
 258 /**
 259  * Load the MDT bitmap from the lfsck_namespace trace file.
 260  *
 261  * \param[in] env       pointer to the thread context
 262  * \param[in] com       pointer to the lfsck component
 263  *
 264  * \retval              0 for success
 265  * \retval              negative error number on failure or data corruption
 266  */
 267 static int lfsck_namespace_load_bitmap(const struct lu_env *env,
 268                                        struct lfsck_component *com)
 269 {
 270         struct dt_object                *obj    = com->lc_obj;
 271         struct lfsck_assistant_data     *lad    = com->lc_data;
 272         struct lfsck_namespace          *ns     = com->lc_file_ram;
 273         cfs_bitmap_t                    *bitmap = lad->lad_bitmap;
 274         ssize_t                          size;
 275         __u32                            nbits;
 276         int                              rc;
 277         ENTRY;
 278
 279         if (com->lc_lfsck->li_mdt_descs.ltd_tgts_bitmap->size >
 280             ns->ln_bitmap_size)
 281                 nbits = com->lc_lfsck->li_mdt_descs.ltd_tgts_bitmap->size;
 282         else
 283                 nbits = ns->ln_bitmap_size;
 284
 285         if (unlikely(nbits < BITS_PER_LONG))
 286                 nbits = BITS_PER_LONG;
 287
 288         if (nbits > bitmap->size) {
 289                 __u32 new_bits = bitmap->size;
 290                 cfs_bitmap_t *new_bitmap;
 291
 292                 while (new_bits < nbits)
 293                         new_bits <<= 1;
 294
 295                 new_bitmap = CFS_ALLOCATE_BITMAP(new_bits);
 296                 if (new_bitmap == NULL)
 297                         RETURN(-ENOMEM);
 298
 299                 lad->lad_bitmap = new_bitmap;
 300                 CFS_FREE_BITMAP(bitmap);
 301                 bitmap = new_bitmap;
 302         }
 303
 304         if (ns->ln_bitmap_size == 0) {
 305                 lad->lad_incomplete = 0;
 306                 CFS_RESET_BITMAP(bitmap);
 307
 308                 RETURN(0);
 309         }
 310
 311         size = (ns->ln_bitmap_size + 7) >> 3;
 312         rc = dt_xattr_get(env, obj,
 313                           lfsck_buf_get(env, bitmap->data, size),
 314                           XATTR_NAME_LFSCK_BITMAP);
 315         if (rc != size)
 316                 RETURN(rc >= 0 ? -EINVAL : rc);
 317
 318         if (cfs_bitmap_check_empty(bitmap))
 319                 lad->lad_incomplete = 0;
 320         else
 321                 lad->lad_incomplete = 1;
 322
 323         RETURN(0);
 324 }
 325
 326 /**
 327  * Load namespace LFSCK statistics information from the trace file.
 328  *
 329  * For old release (Lustre-2.6 or older), the statistics information was
 330  * stored as XATTR_NAME_LFSCK_NAMESPACE_OLD EA. But in Lustre-2.7, we need
 331  * more statistics information. To avoid confusing old MDT when downgrade,
 332  * Lustre-2.7 stores the namespace LFSCK statistics information as new
 333  * XATTR_NAME_LFSCK_NAMESPACE EA.
 334  *
 335  * \param[in] env       pointer to the thread context
 336  * \param[in] com       pointer to the lfsck component
 337  *
 338  * \retval              0 for success
 339  * \retval              negative error number on failure
 340  */
 341 static int lfsck_namespace_load(const struct lu_env *env,
 342                                 struct lfsck_component *com)
 343 {
 344         int len = com->lc_file_size;
 345         int rc;
 346
 347         rc = dt_xattr_get(env, com->lc_obj,
 348                           lfsck_buf_get(env, com->lc_file_disk, len),
 349                           XATTR_NAME_LFSCK_NAMESPACE);
 350         if (rc == len) {
 351                 struct lfsck_namespace *ns = com->lc_file_ram;
 352
 353                 lfsck_namespace_le_to_cpu(ns,
 354                                 (struct lfsck_namespace *)com->lc_file_disk);
 355                 if (ns->ln_magic != LFSCK_NAMESPACE_MAGIC) {
 356                         CDEBUG(D_LFSCK, "%s: invalid lfsck_namespace magic "
 357                                "%#x != %#x\n", lfsck_lfsck2name(com->lc_lfsck),
 358                                ns->ln_magic, LFSCK_NAMESPACE_MAGIC);
 359                         rc = -ESTALE;
 360                 } else {
 361                         rc = 0;
 362                 }
 363         } else if (rc != -ENODATA) {
 364                 CDEBUG(D_LFSCK, "%s: fail to load lfsck_namespace, "
 365                        "expected = %d: rc = %d\n",
 366                        lfsck_lfsck2name(com->lc_lfsck), len, rc);
 367                 if (rc >= 0)
 368                         rc = -ESTALE;
 369         } else {
 370                 /* Check whether it is old trace file or not.
 371                  * If yes, it should be reset via returning -ESTALE. */
 372                 rc = dt_xattr_get(env, com->lc_obj,
 373                                   lfsck_buf_get(env, com->lc_file_disk, len),
 374                                   XATTR_NAME_LFSCK_NAMESPACE_OLD);
 375                 if (rc >= 0)
 376                         rc = -ESTALE;
 377         }
 378
 379         return rc;
 380 }
 381
 382 static int lfsck_namespace_store(const struct lu_env *env,
 383                                  struct lfsck_component *com, bool init)
 384 {
 385         struct dt_object                *obj    = com->lc_obj;
 386         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 387         struct lfsck_namespace          *ns     = com->lc_file_ram;
 388         struct lfsck_assistant_data     *lad    = com->lc_data;
 389         struct dt_device                *dev    = lfsck_obj2dev(obj);
 390         cfs_bitmap_t                    *bitmap = NULL;
 391         struct thandle                  *handle;
 392         __u32                            nbits  = 0;
 393         int                              len    = com->lc_file_size;
 394         int                              rc;
 395 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 8, 53, 0)
 396         struct lu_buf            tbuf   = { &len, sizeof(len) };
 397 #endif
 398         ENTRY;
 399
 400         if (lad != NULL) {
 401                 bitmap = lad->lad_bitmap;
 402                 nbits = bitmap->size;
 403
 404                 LASSERT(nbits > 0);
 405                 LASSERTF((nbits & 7) == 0, "Invalid nbits %u\n", nbits);
 406         }
 407
 408         ns->ln_bitmap_size = nbits;
 409         lfsck_namespace_cpu_to_le((struct lfsck_namespace *)com->lc_file_disk,
 410                                   ns);
 411         handle = dt_trans_create(env, dev);
 412         if (IS_ERR(handle))
 413                 GOTO(log, rc = PTR_ERR(handle));
 414
 415         rc = dt_declare_xattr_set(env, obj,
 416                                   lfsck_buf_get(env, com->lc_file_disk, len),
 417                                   XATTR_NAME_LFSCK_NAMESPACE, 0, handle);
 418         if (rc != 0)
 419                 GOTO(out, rc);
 420
 421         if (bitmap != NULL) {
 422                 rc = dt_declare_xattr_set(env, obj,
 423                                 lfsck_buf_get(env, bitmap->data, nbits >> 3),
 424                                 XATTR_NAME_LFSCK_BITMAP, 0, handle);
 425                 if (rc != 0)
 426                         GOTO(out, rc);
 427         }
 428
 429 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 8, 53, 0)
 430         /* To be compatible with old Lustre-2.x MDT (x <= 6), generate dummy
 431          * XATTR_NAME_LFSCK_NAMESPACE_OLD EA, then when downgrade to Lustre-2.x,
 432          * the old LFSCK will find "invalid" XATTR_NAME_LFSCK_NAMESPACE_OLD EA,
 433          * then reset the namespace LFSCK trace file. */
 434         if (init) {
 435                 rc = dt_declare_xattr_set(env, obj, &tbuf,
 436                                           XATTR_NAME_LFSCK_NAMESPACE_OLD,
 437                                           LU_XATTR_CREATE, handle);
 438                 if (rc != 0)
 439                         GOTO(out, rc);
 440         }
 441 #endif
 442
 443         rc = dt_trans_start_local(env, dev, handle);
 444         if (rc != 0)
 445                 GOTO(out, rc);
 446
 447         rc = dt_xattr_set(env, obj,
 448                           lfsck_buf_get(env, com->lc_file_disk, len),
 449                           XATTR_NAME_LFSCK_NAMESPACE, 0, handle);
 450         if (rc == 0 && bitmap != NULL)
 451                 rc = dt_xattr_set(env, obj,
 452                                   lfsck_buf_get(env, bitmap->data, nbits >> 3),
 453                                   XATTR_NAME_LFSCK_BITMAP, 0, handle);
 454
 455 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 8, 53, 0)
 456         if (rc == 0 && init)
 457                 rc = dt_xattr_set(env, obj, &tbuf,
 458                                   XATTR_NAME_LFSCK_NAMESPACE_OLD,
 459                                   LU_XATTR_CREATE, handle);
 460 #endif
 461
 462         GOTO(out, rc);
 463
 464 out:
 465         dt_trans_stop(env, dev, handle);
 466
 467 log:
 468         if (rc != 0)
 469                 CDEBUG(D_LFSCK, "%s: fail to store lfsck_namespace: rc = %d\n",
 470                        lfsck_lfsck2name(lfsck), rc);
 471         return rc;
 472 }
 473
 474 static struct dt_object *
 475 lfsck_namespace_load_one_trace_file(const struct lu_env *env,
 476                                     struct lfsck_component *com,
 477                                     struct dt_object *parent,
 478                                     const char *name, bool reset)
 479 {
 480         struct lfsck_instance   *lfsck = com->lc_lfsck;
 481         struct dt_object        *obj;
 482         int                      rc;
 483
 484         if (reset) {
 485                 rc = local_object_unlink(env, lfsck->li_bottom, parent, name);
 486                 if (rc != 0 && rc != -ENOENT)
 487                         return ERR_PTR(rc);
 488         }
 489
 490         obj = local_index_find_or_create(env, lfsck->li_los, parent, name,
 491                                          S_IFREG | S_IRUGO | S_IWUSR,
 492                                          &dt_lfsck_features);
 493
 494         return obj;
 495 }
 496
 497 static int lfsck_namespace_load_sub_trace_files(const struct lu_env *env,
 498                                                 struct lfsck_component *com,
 499                                                 bool reset)
 500 {
 501         char                            *name = lfsck_env_info(env)->lti_key;
 502         struct lfsck_sub_trace_obj      *lsto;
 503         struct dt_object                *obj;
 504         int                              rc;
 505         int                              i;
 506
 507         for (i = 0, lsto = &com->lc_sub_trace_objs[0];
 508              i < LFSCK_STF_COUNT; i++, lsto++) {
 509                 snprintf(name, NAME_MAX, "%s_%02d", LFSCK_NAMESPACE, i);
 510                 if (lsto->lsto_obj != NULL) {
 511                         if (!reset)
 512                                 continue;
 513
 514                         lfsck_object_put(env, lsto->lsto_obj);
 515                         lsto->lsto_obj = NULL;
 516                 }
 517
 518                 obj = lfsck_namespace_load_one_trace_file(env, com,
 519                                 com->lc_lfsck->li_lfsck_dir, name, reset);
 520                 if (IS_ERR(obj))
 521                         return PTR_ERR(obj);
 522
 523                 lsto->lsto_obj = obj;
 524                 rc = obj->do_ops->do_index_try(env, obj, &dt_lfsck_features);
 525                 if (rc != 0)
 526                         return rc;
 527         }
 528
 529         return 0;
 530 }
 531
 532 static int lfsck_namespace_init(const struct lu_env *env,
 533                                 struct lfsck_component *com)
 534 {
 535         struct lfsck_namespace *ns = com->lc_file_ram;
 536         int rc;
 537
 538         memset(ns, 0, sizeof(*ns));
 539         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
 540         ns->ln_status = LS_INIT;
 541         down_write(&com->lc_sem);
 542         rc = lfsck_namespace_store(env, com, true);
 543         up_write(&com->lc_sem);
 544         if (rc == 0)
 545                 rc = lfsck_namespace_load_sub_trace_files(env, com, true);
 546
 547         return rc;
 548 }
 549
 550 /**
 551  * Update the namespace LFSCK trace file for the given @fid
 552  *
 553  * \param[in] env       pointer to the thread context
 554  * \param[in] com       pointer to the lfsck component
 555  * \param[in] fid       the fid which flags to be updated in the lfsck
 556  *                      trace file
 557  * \param[in] add       true if add new flags, otherwise remove flags
 558  *
 559  * \retval              0 for succeed or nothing to be done
 560  * \retval              negative error number on failure
 561  */
 562 int lfsck_namespace_trace_update(const struct lu_env *env,
 563                                  struct lfsck_component *com,
 564                                  const struct lu_fid *fid,
 565                                  const __u8 flags, bool add)
 566 {
 567         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 568         struct dt_object        *obj;
 569         struct lu_fid           *key    = &lfsck_env_info(env)->lti_fid3;
 570         struct dt_device        *dev;
 571         struct thandle          *th     = NULL;
 572         int                      idx;
 573         int                      rc     = 0;
 574         __u8                     old    = 0;
 575         __u8                     new    = 0;
 576         ENTRY;
 577
 578         LASSERT(flags != 0);
 579
 580         if (unlikely(!fid_is_sane(fid)))
 581                 RETURN(0);
 582
 583         idx = lfsck_sub_trace_file_fid2idx(fid);
 584         obj = com->lc_sub_trace_objs[idx].lsto_obj;
 585         dev = lfsck_obj2dev(obj);
 586         mutex_lock(&com->lc_sub_trace_objs[idx].lsto_mutex);
 587         fid_cpu_to_be(key, fid);
 588         rc = dt_lookup(env, obj, (struct dt_rec *)&old,
 589                        (const struct dt_key *)key);
 590         if (rc == -ENOENT) {
 591                 if (!add)
 592                         GOTO(unlock, rc = 0);
 593
 594                 old = 0;
 595                 new = flags;
 596         } else if (rc == 0) {
 597                 if (add) {
 598                         if ((old & flags) == flags)
 599                                 GOTO(unlock, rc = 0);
 600
 601                         new = old | flags;
 602                 } else {
 603                         if ((old & flags) == 0)
 604                                 GOTO(unlock, rc = 0);
 605
 606                         new = old & ~flags;
 607                 }
 608         } else {
 609                 GOTO(log, rc);
 610         }
 611
 612         th = dt_trans_create(env, dev);
 613         if (IS_ERR(th))
 614                 GOTO(log, rc = PTR_ERR(th));
 615
 616         if (old != 0) {
 617                 rc = dt_declare_delete(env, obj,
 618                                        (const struct dt_key *)key, th);
 619                 if (rc != 0)
 620                         GOTO(log, rc);
 621         }
 622
 623         if (new != 0) {
 624                 rc = dt_declare_insert(env, obj,
 625                                        (const struct dt_rec *)&new,
 626                                        (const struct dt_key *)key, th);
 627                 if (rc != 0)
 628                         GOTO(log, rc);
 629         }
 630
 631         rc = dt_trans_start_local(env, dev, th);
 632         if (rc != 0)
 633                 GOTO(log, rc);
 634
 635         if (old != 0) {
 636                 rc = dt_delete(env, obj, (const struct dt_key *)key, th);
 637                 if (rc != 0)
 638                         GOTO(log, rc);
 639         }
 640
 641         if (new != 0) {
 642                 rc = dt_insert(env, obj, (const struct dt_rec *)&new,
 643                                (const struct dt_key *)key, th, 1);
 644                 if (rc != 0)
 645                         GOTO(log, rc);
 646         }
 647
 648         GOTO(log, rc);
 649
 650 log:
 651         if (th != NULL && !IS_ERR(th))
 652                 dt_trans_stop(env, dev, th);
 653
 654         CDEBUG(D_LFSCK, "%s: namespace LFSCK %s flags for "DFID" in the "
 655                "trace file, flags %x, old %x, new %x: rc = %d\n",
 656                lfsck_lfsck2name(lfsck), add ? "add" : "del", PFID(fid),
 657                (__u32)flags, (__u32)old, (__u32)new, rc);
 658
 659 unlock:
 660         mutex_unlock(&com->lc_sub_trace_objs[idx].lsto_mutex);
 661
 662         return rc;
 663 }
 664
 665 int lfsck_namespace_check_exist(const struct lu_env *env,
 666                                 struct dt_object *dir,
 667                                 struct dt_object *obj, const char *name)
 668 {
 669         struct lu_fid    *fid = &lfsck_env_info(env)->lti_fid;
 670         int               rc;
 671         ENTRY;
 672
 673         if (unlikely(lfsck_is_dead_obj(obj)))
 674                 RETURN(LFSCK_NAMEENTRY_DEAD);
 675
 676         rc = dt_lookup(env, dir, (struct dt_rec *)fid,
 677                        (const struct dt_key *)name);
 678         if (rc == -ENOENT)
 679                 RETURN(LFSCK_NAMEENTRY_REMOVED);
 680
 681         if (rc < 0)
 682                 RETURN(rc);
 683
 684         if (!lu_fid_eq(fid, lfsck_dto2fid(obj)))
 685                 RETURN(LFSCK_NAMEENTRY_RECREATED);
 686
 687         RETURN(0);
 688 }
 689
 690 static int lfsck_declare_namespace_exec_dir(const struct lu_env *env,
 691                                             struct dt_object *obj,
 692                                             struct thandle *handle)
 693 {
 694         int rc;
 695
 696         /* For destroying all invalid linkEA entries. */
 697         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, handle);
 698         if (rc != 0)
 699                 return rc;
 700
 701         /* For insert new linkEA entry. */
 702         rc = dt_declare_xattr_set(env, obj,
 703                         lfsck_buf_get_const(env, NULL, DEFAULT_LINKEA_SIZE),
 704                         XATTR_NAME_LINK, 0, handle);
 705         return rc;
 706 }
 707
 708 int __lfsck_links_read(const struct lu_env *env, struct dt_object *obj,
 709                        struct linkea_data *ldata)
 710 {
 711         int rc;
 712
 713         if (ldata->ld_buf->lb_buf == NULL)
 714                 return -ENOMEM;
 715
 716         if (!dt_object_exists(obj))
 717                 return -ENOENT;
 718
 719         rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK);
 720         if (rc == -ERANGE) {
 721                 /* Buf was too small, figure out what we need. */
 722                 rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LINK);
 723                 if (rc <= 0)
 724                         return rc;
 725
 726                 lu_buf_realloc(ldata->ld_buf, rc);
 727                 if (ldata->ld_buf->lb_buf == NULL)
 728                         return -ENOMEM;
 729
 730                 rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK);
 731         }
 732
 733         if (rc > 0)
 734                 rc = linkea_init(ldata);
 735
 736         return rc;
 737 }
 738
 739 /**
 740  * Remove linkEA for the given object.
 741  *
 742  * The caller should take the ldlm lock before the calling.
 743  *
 744  * \param[in] env       pointer to the thread context
 745  * \param[in] com       pointer to the lfsck component
 746  * \param[in] obj       pointer to the dt_object to be handled
 747  *
 748  * \retval              0 for repaired cases
 749  * \retval              negative error number on failure
 750  */
 751 static int lfsck_namespace_links_remove(const struct lu_env *env,
 752                                         struct lfsck_component *com,
 753                                         struct dt_object *obj)
 754 {
 755         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 756         struct dt_device                *dev    = lfsck_obj2dev(obj);
 757         struct thandle                  *th     = NULL;
 758         int                              rc     = 0;
 759         ENTRY;
 760
 761         LASSERT(dt_object_remote(obj) == 0);
 762
 763         th = dt_trans_create(env, dev);
 764         if (IS_ERR(th))
 765                 GOTO(log, rc = PTR_ERR(th));
 766
 767         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, th);
 768         if (rc != 0)
 769                 GOTO(stop, rc);
 770
 771         rc = dt_trans_start_local(env, dev, th);
 772         if (rc != 0)
 773                 GOTO(stop, rc);
 774
 775         dt_write_lock(env, obj, 0);
 776         if (unlikely(lfsck_is_dead_obj(obj)))
 777                 GOTO(unlock, rc = -ENOENT);
 778
 779         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
 780                 GOTO(unlock, rc = 0);
 781
 782         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, th);
 783
 784         GOTO(unlock, rc);
 785
 786 unlock:
 787         dt_write_unlock(env, obj);
 788
 789 stop:
 790         dt_trans_stop(env, dev, th);
 791
 792 log:
 793         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove invalid linkEA "
 794                "for the object "DFID": rc = %d\n",
 795                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
 796
 797         if (rc == 0) {
 798                 struct lfsck_namespace *ns = com->lc_file_ram;
 799
 800                 ns->ln_flags |= LF_INCONSISTENT;
 801         }
 802
 803         return rc;
 804 }
 805
 806 static int lfsck_links_write(const struct lu_env *env, struct dt_object *obj,
 807                              struct linkea_data *ldata, struct thandle *handle)
 808 {
 809         const struct lu_buf *buf = lfsck_buf_get_const(env,
 810                                                        ldata->ld_buf->lb_buf,
 811                                                        ldata->ld_leh->leh_len);
 812
 813         return dt_xattr_set(env, obj, buf, XATTR_NAME_LINK, 0, handle);
 814 }
 815
 816 static void lfsck_namespace_unpack_linkea_entry(struct linkea_data *ldata,
 817                                                 struct lu_name *cname,
 818                                                 struct lu_fid *pfid,
 819                                                 char *buf)
 820 {
 821         linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, cname, pfid);
 822         /* To guarantee the 'name' is terminated with '0'. */
 823         memcpy(buf, cname->ln_name, cname->ln_namelen);
 824         buf[cname->ln_namelen] = 0;
 825         cname->ln_name = buf;
 826 }
 827
 828 static int lfsck_namespace_filter_linkea_entry(struct linkea_data *ldata,
 829                                                struct lu_name *cname,
 830                                                struct lu_fid *pfid,
 831                                                bool remove)
 832 {
 833         struct link_ea_entry    *oldlee;
 834         int                      oldlen;
 835         int                      repeated = 0;
 836
 837         oldlee = ldata->ld_lee;
 838         oldlen = ldata->ld_reclen;
 839         linkea_next_entry(ldata);
 840         while (ldata->ld_lee != NULL) {
 841                 ldata->ld_reclen = (ldata->ld_lee->lee_reclen[0] << 8) |
 842                                    ldata->ld_lee->lee_reclen[1];
 843                 if (unlikely(ldata->ld_reclen == oldlen &&
 844                              memcmp(ldata->ld_lee, oldlee, oldlen) == 0)) {
 845                         repeated++;
 846                         if (!remove)
 847                                 break;
 848
 849                         linkea_del_buf(ldata, cname);
 850                 } else {
 851                         linkea_next_entry(ldata);
 852                 }
 853         }
 854         ldata->ld_lee = oldlee;
 855         ldata->ld_reclen = oldlen;
 856
 857         return repeated;
 858 }
 859
 860 /**
 861  * Insert orphan into .lustre/lost+found/MDTxxxx/ locally.
 862  *
 863  * Add the specified orphan MDT-object to the .lustre/lost+found/MDTxxxx/
 864  * with the given type to generate the name, the detailed rules for name
 865  * have been described as following.
 866  *
 867  * The function also generates the linkEA corresponding to the name entry
 868  * under the .lustre/lost+found/MDTxxxx/ for the orphan MDT-object.
 869  *
 870  * \param[in] env       pointer to the thread context
 871  * \param[in] com       pointer to the lfsck component
 872  * \param[in] orphan    pointer to the orphan MDT-object
 873  * \param[in] infix     additional information for the orphan name, such as
 874  *                      the FID for original
 875  * \param[in] type      the type for describing why the orphan MDT-object is
 876  *                      created. The rules are as following:
 877  *
 878  *  type "D":           The MDT-object is a directory, it may knows its parent
 879  *                      but because there is no valid linkEA, the LFSCK cannot
 880  *                      know where to put it back to the namespace.
 881  *  type "O":           The MDT-object has no linkEA, and there is no name
 882  *                      entry that references the MDT-object.
 883  *
 884  *  type "S":           The orphan MDT-object is a shard of a striped directory
 885  *
 886  * \see lfsck_layout_recreate_parent() for more types.
 887  *
 888  * The orphan name will be like:
 889  * ${FID}-${infix}-${type}-${conflict_version}
 890  *
 891  * \param[out] count    if some others inserted some linkEA entries by race,
 892  *                      then return the linkEA entries count.
 893  *
 894  * \retval              positive number for repaired cases
 895  * \retval              0 if needs to repair nothing
 896  * \retval              negative error number on failure
 897  */
 898 static int lfsck_namespace_insert_orphan(const struct lu_env *env,
 899                                          struct lfsck_component *com,
 900                                          struct dt_object *orphan,
 901                                          const char *infix, const char *type,
 902                                          int *count)
 903 {
 904         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 905         struct lu_name                  *cname  = &info->lti_name;
 906         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
 907         struct lu_attr                  *la     = &info->lti_la3;
 908         const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
 909         const struct lu_fid             *pfid;
 910         struct lu_fid                    tfid;
 911         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 912         struct dt_device                *dev    = lfsck_obj2dev(orphan);
 913         struct dt_object                *parent;
 914         struct thandle                  *th     = NULL;
 915         struct lfsck_lock_handle        *pllh   = &info->lti_llh;
 916         struct lustre_handle             clh    = { 0 };
 917         struct linkea_data               ldata  = { NULL };
 918         struct lu_buf                    linkea_buf;
 919         int                              namelen;
 920         int                              idx    = 0;
 921         int                              rc     = 0;
 922         bool                             exist  = false;
 923         ENTRY;
 924
 925         cname->ln_name = NULL;
 926         if (unlikely(lfsck->li_lpf_obj == NULL))
 927                 GOTO(log, rc = -ENXIO);
 928
 929         parent = lfsck->li_lpf_obj;
 930         pfid = lfsck_dto2fid(parent);
 931
 932 again:
 933         do {
 934                 namelen = snprintf(info->lti_key, NAME_MAX, DFID"%s-%s-%d",
 935                                    PFID(cfid), infix, type, idx++);
 936                 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
 937                                (const struct dt_key *)info->lti_key);
 938                 if (rc != 0 && rc != -ENOENT)
 939                         GOTO(log, rc);
 940
 941                 if (unlikely(rc == 0 && lu_fid_eq(cfid, &tfid)))
 942                         exist = true;
 943         } while (rc == 0 && !exist);
 944
 945         rc = lfsck_lock(env, lfsck, parent, info->lti_key, pllh,
 946                         MDS_INODELOCK_UPDATE, LCK_PW);
 947         if (rc != 0)
 948                 GOTO(log, rc);
 949
 950         /* Re-check whether the name conflict with othrs after taken
 951          * the ldlm lock. */
 952         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
 953                        (const struct dt_key *)info->lti_key);
 954         if (rc == 0) {
 955                 if (!lu_fid_eq(cfid, &tfid)) {
 956                         exist = false;
 957                         lfsck_unlock(pllh);
 958                         goto again;
 959                 }
 960
 961                 exist = true;
 962         } else if (rc != -ENOENT) {
 963                 GOTO(log, rc);
 964         } else {
 965                 exist = false;
 966         }
 967
 968         cname->ln_name = info->lti_key;
 969         cname->ln_namelen = namelen;
 970         rc = linkea_data_new(&ldata, &info->lti_linkea_buf2);
 971         if (rc != 0)
 972                 GOTO(log, rc);
 973
 974         rc = linkea_add_buf(&ldata, cname, pfid);
 975         if (rc != 0)
 976                 GOTO(log, rc);
 977
 978         rc = lfsck_ibits_lock(env, lfsck, orphan, &clh,
 979                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_LOOKUP |
 980                               MDS_INODELOCK_XATTR, LCK_EX);
 981         if (rc != 0)
 982                 GOTO(log, rc);
 983
 984         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
 985                        ldata.ld_leh->leh_len);
 986         th = dt_trans_create(env, dev);
 987         if (IS_ERR(th))
 988                 GOTO(log, rc = PTR_ERR(th));
 989
 990         if (S_ISDIR(lfsck_object_type(orphan))) {
 991                 rc = dt_declare_delete(env, orphan,
 992                                        (const struct dt_key *)dotdot, th);
 993                 if (rc != 0)
 994                         GOTO(stop, rc);
 995
 996                 rec->rec_type = S_IFDIR;
 997                 rec->rec_fid = pfid;
 998                 rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
 999                                        (const struct dt_key *)dotdot, th);
1000                 if (rc != 0)
1001                         GOTO(stop, rc);
1002         }
1003
1004         rc = dt_declare_xattr_set(env, orphan, &linkea_buf,
1005                                   XATTR_NAME_LINK, 0, th);
1006         if (rc != 0)
1007                 GOTO(stop, rc);
1008
1009         if (!exist) {
1010                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
1011                 rec->rec_fid = cfid;
1012                 rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1013                                        (const struct dt_key *)cname->ln_name,
1014                                        th);
1015                 if (rc != 0)
1016                         GOTO(stop, rc);
1017
1018                 if (S_ISDIR(rec->rec_type)) {
1019                         rc = dt_declare_ref_add(env, parent, th);
1020                         if (rc != 0)
1021                                 GOTO(stop, rc);
1022                 }
1023         }
1024
1025         memset(la, 0, sizeof(*la));
1026         la->la_ctime = cfs_time_current_sec();
1027         la->la_valid = LA_CTIME;
1028         rc = dt_declare_attr_set(env, orphan, la, th);
1029         if (rc != 0)
1030                 GOTO(stop, rc);
1031
1032         rc = dt_trans_start_local(env, dev, th);
1033         if (rc != 0)
1034                 GOTO(stop, rc);
1035
1036         dt_write_lock(env, orphan, 0);
1037         rc = lfsck_links_read(env, orphan, &ldata);
1038         if (likely((rc == -ENODATA) || (rc == -EINVAL) ||
1039                    (rc == 0 && ldata.ld_leh->leh_reccount == 0))) {
1040                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1041                         GOTO(unlock, rc = 1);
1042
1043                 if (S_ISDIR(lfsck_object_type(orphan))) {
1044                         rc = dt_delete(env, orphan,
1045                                        (const struct dt_key *)dotdot, th);
1046                         if (rc != 0)
1047                                 GOTO(unlock, rc);
1048
1049                         rec->rec_type = S_IFDIR;
1050                         rec->rec_fid = pfid;
1051                         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1052                                        (const struct dt_key *)dotdot, th, 1);
1053                         if (rc != 0)
1054                                 GOTO(unlock, rc);
1055                 }
1056
1057                 rc = dt_xattr_set(env, orphan, &linkea_buf, XATTR_NAME_LINK, 0,
1058                                   th);
1059         } else {
1060                 if (rc == 0 && count != NULL)
1061                         *count = ldata.ld_leh->leh_reccount;
1062
1063                 GOTO(unlock, rc);
1064         }
1065         dt_write_unlock(env, orphan);
1066
1067         if (rc == 0 && !exist) {
1068                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
1069                 rec->rec_fid = cfid;
1070                 rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1071                                (const struct dt_key *)cname->ln_name, th, 1);
1072                 if (rc == 0 && S_ISDIR(rec->rec_type)) {
1073                         dt_write_lock(env, parent, 0);
1074                         rc = dt_ref_add(env, parent, th);
1075                         dt_write_unlock(env, parent);
1076                 }
1077         }
1078
1079         if (rc == 0)
1080                 rc = dt_attr_set(env, orphan, la, th);
1081
1082         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1083
1084 unlock:
1085         dt_write_unlock(env, orphan);
1086
1087 stop:
1088         dt_trans_stop(env, dev, th);
1089
1090 log:
1091         lfsck_ibits_unlock(&clh, LCK_EX);
1092         lfsck_unlock(pllh);
1093         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert orphan for the "
1094                "object "DFID", name = %s: rc = %d\n",
1095                lfsck_lfsck2name(lfsck), PFID(cfid),
1096                cname->ln_name != NULL ? cname->ln_name : "<NULL>", rc);
1097
1098         if (rc != 0) {
1099                 struct lfsck_namespace *ns = com->lc_file_ram;
1100
1101                 ns->ln_flags |= LF_INCONSISTENT;
1102         }
1103
1104         return rc;
1105 }
1106
1107 /**
1108  * Add the specified name entry back to namespace.
1109  *
1110  * If there is a linkEA entry that back references a name entry under
1111  * some parent directory, but such parent directory does not have the
1112  * claimed name entry. On the other hand, the linkEA entries count is
1113  * not larger than the MDT-object's hard link count. Under such case,
1114  * it is quite possible that the name entry is lost. Then the LFSCK
1115  * should add the name entry back to the namespace.
1116  *
1117  * \param[in] env       pointer to the thread context
1118  * \param[in] com       pointer to the lfsck component
1119  * \param[in] parent    pointer to the directory under which the name entry
1120  *                      will be inserted into
1121  * \param[in] child     pointer to the object referenced by the name entry
1122  *                      that to be inserted into the parent
1123  * \param[in] name      the name for the child in the parent directory
1124  *
1125  * \retval              positive number for repaired cases
1126  * \retval              0 if nothing to be repaired
1127  * \retval              negative error number on failure
1128  */
1129 static int lfsck_namespace_insert_normal(const struct lu_env *env,
1130                                          struct lfsck_component *com,
1131                                          struct dt_object *parent,
1132                                          struct dt_object *child,
1133                                          const char *name)
1134 {
1135         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1136         struct lu_attr                  *la     = &info->lti_la;
1137         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1138         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1139         /* The child and its name may be on different MDTs. */
1140         struct dt_device                *dev    = lfsck->li_next;
1141         struct dt_object                *pobj   = NULL;
1142         struct dt_object                *cobj   = NULL;
1143         struct thandle                  *th     = NULL;
1144         struct lfsck_lock_handle        *llh    = &info->lti_llh;
1145         int                              rc     = 0;
1146         ENTRY;
1147
1148         /* @parent/@child may be based on lfsck->li_bottom,
1149          * but here we need the object based on the lfsck->li_next. */
1150
1151         pobj = lfsck_object_locate(dev, parent);
1152         if (IS_ERR(pobj))
1153                 GOTO(log, rc = PTR_ERR(pobj));
1154
1155         if (unlikely(!dt_try_as_dir(env, pobj)))
1156                 GOTO(log, rc = -ENOTDIR);
1157
1158         cobj = lfsck_object_locate(dev, child);
1159         if (IS_ERR(cobj))
1160                 GOTO(log, rc = PTR_ERR(cobj));
1161
1162         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1163                 GOTO(log, rc = 1);
1164
1165         rc = lfsck_lock(env, lfsck, parent, name, llh,
1166                         MDS_INODELOCK_UPDATE, LCK_PW);
1167         if (rc != 0)
1168                 GOTO(log, rc);
1169
1170         th = dt_trans_create(env, dev);
1171         if (IS_ERR(th))
1172                 GOTO(unlock, rc = PTR_ERR(th));
1173
1174         rec->rec_type = lfsck_object_type(cobj) & S_IFMT;
1175         rec->rec_fid = lfsck_dto2fid(cobj);
1176         rc = dt_declare_insert(env, pobj, (const struct dt_rec *)rec,
1177                                (const struct dt_key *)name, th);
1178         if (rc != 0)
1179                 GOTO(stop, rc);
1180
1181         if (S_ISDIR(rec->rec_type)) {
1182                 rc = dt_declare_ref_add(env, pobj, th);
1183                 if (rc != 0)
1184                         GOTO(stop, rc);
1185         }
1186
1187         memset(la, 0, sizeof(*la));
1188         la->la_ctime = cfs_time_current_sec();
1189         la->la_valid = LA_CTIME;
1190         rc = dt_declare_attr_set(env, pobj, la, th);
1191         if (rc != 0)
1192                 GOTO(stop, rc);
1193
1194         rc = dt_declare_attr_set(env, cobj, la, th);
1195         if (rc != 0)
1196                 GOTO(stop, rc);
1197
1198         rc = dt_trans_start_local(env, dev, th);
1199         if (rc != 0)
1200                 GOTO(stop, rc);
1201
1202         rc = dt_insert(env, pobj, (const struct dt_rec *)rec,
1203                        (const struct dt_key *)name, th, 1);
1204         if (rc != 0)
1205                 GOTO(stop, rc);
1206
1207         if (S_ISDIR(rec->rec_type)) {
1208                 dt_write_lock(env, pobj, 0);
1209                 rc = dt_ref_add(env, pobj, th);
1210                 dt_write_unlock(env, pobj);
1211                 if (rc != 0)
1212                         GOTO(stop, rc);
1213         }
1214
1215         la->la_ctime = cfs_time_current_sec();
1216         rc = dt_attr_set(env, pobj, la, th);
1217         if (rc != 0)
1218                 GOTO(stop, rc);
1219
1220         rc = dt_attr_set(env, cobj, la, th);
1221
1222         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1223
1224 stop:
1225         dt_trans_stop(env, dev, th);
1226
1227 unlock:
1228         lfsck_unlock(llh);
1229
1230 log:
1231         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert object "DFID" with "
1232                "the name %s and type %o to the parent "DFID": rc = %d\n",
1233                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(child)), name,
1234                lfsck_object_type(child) & S_IFMT,
1235                PFID(lfsck_dto2fid(parent)), rc);
1236
1237         if (rc != 0) {
1238                 struct lfsck_namespace *ns = com->lc_file_ram;
1239
1240                 ns->ln_flags |= LF_INCONSISTENT;
1241                 if (rc > 0)
1242                         ns->ln_lost_dirent_repaired++;
1243         }
1244
1245         return rc;
1246 }
1247
1248 /**
1249  * Create the specified orphan directory.
1250  *
1251  * For the case that the parent MDT-object stored in some MDT-object's
1252  * linkEA entry is lost, the LFSCK will re-create the parent object as
1253  * an orphan and insert it into .lustre/lost+found/MDTxxxx/ directory
1254  * with the name ${FID}-P-${conflict_version}.
1255  *
1256  * \param[in] env       pointer to the thread context
1257  * \param[in] com       pointer to the lfsck component
1258  * \param[in] orphan    pointer to the orphan MDT-object to be created
1259  * \param[in] lmv       pointer to master LMV EA that will be set to the orphan
1260  *
1261  * \retval              positive number for repaired cases
1262  * \retval              negative error number on failure
1263  */
1264 static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
1265                                              struct lfsck_component *com,
1266                                              struct dt_object *orphan,
1267                                              struct lmv_mds_md_v1 *lmv)
1268 {
1269         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1270         struct lu_attr                  *la     = &info->lti_la;
1271         struct dt_allocation_hint       *hint   = &info->lti_hint;
1272         struct dt_object_format         *dof    = &info->lti_dof;
1273         struct lu_name                  *cname  = &info->lti_name2;
1274         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1275         struct lmv_mds_md_v1            *lmv2   = &info->lti_lmv2;
1276         const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
1277         struct lu_fid                    tfid;
1278         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1279         struct lfsck_namespace          *ns     = com->lc_file_ram;
1280         struct dt_device                *dev    = lfsck_obj2dev(orphan);
1281         struct dt_object                *parent = NULL;
1282         struct thandle                  *th     = NULL;
1283         struct lfsck_lock_handle        *llh    = &info->lti_llh;
1284         struct linkea_data               ldata  = { NULL };
1285         struct lu_buf                    linkea_buf;
1286         struct lu_buf                    lmv_buf;
1287         char                             name[32];
1288         int                              namelen;
1289         int                              idx    = 0;
1290         int                              rc     = 0;
1291         ENTRY;
1292
1293         LASSERT(!dt_object_exists(orphan));
1294
1295         cname->ln_name = NULL;
1296         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1297                 GOTO(log, rc = 1);
1298
1299         if (dt_object_remote(orphan)) {
1300                 LASSERT(lfsck->li_lpf_root_obj != NULL);
1301
1302                 idx = lfsck_find_mdt_idx_by_fid(env, lfsck, cfid);
1303                 if (idx < 0)
1304                         GOTO(log, rc = idx);
1305
1306                 snprintf(name, 8, "MDT%04x", idx);
1307                 rc = dt_lookup(env, lfsck->li_lpf_root_obj,
1308                                (struct dt_rec *)&tfid,
1309                                (const struct dt_key *)name);
1310                 if (rc != 0)
1311                         GOTO(log, rc = (rc == -ENOENT ? -ENXIO : rc));
1312
1313                 parent = lfsck_object_find_bottom(env, lfsck, &tfid);
1314                 if (IS_ERR(parent))
1315                         GOTO(log, rc = PTR_ERR(parent));
1316
1317                 if (unlikely(!dt_try_as_dir(env, parent)))
1318                         GOTO(log, rc = -ENOTDIR);
1319         } else {
1320                 if (unlikely(lfsck->li_lpf_obj == NULL))
1321                         GOTO(log, rc = -ENXIO);
1322
1323                 parent = lfsck->li_lpf_obj;
1324         }
1325
1326         dev = lfsck_find_dev_by_fid(env, lfsck, cfid);
1327         if (IS_ERR(dev))
1328                 GOTO(log, rc = PTR_ERR(dev));
1329
1330         idx = 0;
1331
1332 again:
1333         do {
1334                 namelen = snprintf(name, 31, DFID"-P-%d",
1335                                    PFID(cfid), idx++);
1336                 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
1337                                (const struct dt_key *)name);
1338                 if (rc != 0 && rc != -ENOENT)
1339                         GOTO(log, rc);
1340         } while (rc == 0);
1341
1342         rc = lfsck_lock(env, lfsck, parent, name, llh,
1343                         MDS_INODELOCK_UPDATE, LCK_PW);
1344         if (rc != 0)
1345                 GOTO(log, rc);
1346
1347         /* Re-check whether the name conflict with othrs after taken
1348          * the ldlm lock. */
1349         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
1350                        (const struct dt_key *)name);
1351         if (unlikely(rc == 0)) {
1352                 lfsck_unlock(llh);
1353                 goto again;
1354         }
1355
1356         if (rc != -ENOENT)
1357                 GOTO(unlock1, rc);
1358
1359         cname->ln_name = name;
1360         cname->ln_namelen = namelen;
1361
1362         memset(la, 0, sizeof(*la));
1363         la->la_mode = S_IFDIR | 0700;
1364         la->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
1365                        LA_ATIME | LA_MTIME | LA_CTIME;
1366
1367         orphan->do_ops->do_ah_init(env, hint, parent, orphan,
1368                                    la->la_mode & S_IFMT);
1369
1370         memset(dof, 0, sizeof(*dof));
1371         dof->dof_type = dt_mode_to_dft(S_IFDIR);
1372
1373         rc = linkea_data_new(&ldata, &info->lti_linkea_buf2);
1374         if (rc != 0)
1375                 GOTO(unlock1, rc);
1376
1377         rc = linkea_add_buf(&ldata, cname, lfsck_dto2fid(parent));
1378         if (rc != 0)
1379                 GOTO(unlock1, rc);
1380
1381         th = dt_trans_create(env, dev);
1382         if (IS_ERR(th))
1383                 GOTO(unlock1, rc = PTR_ERR(th));
1384
1385         /* Sync the remote transaction to guarantee that the subsequent
1386          * lock against the @orphan can find the @orphan in time. */
1387         if (dt_object_remote(orphan))
1388                 th->th_sync = 1;
1389
1390         rc = dt_declare_create(env, orphan, la, hint, dof, th);
1391         if (rc != 0)
1392                 GOTO(stop, rc);
1393
1394         if (unlikely(!dt_try_as_dir(env, orphan)))
1395                 GOTO(stop, rc = -ENOTDIR);
1396
1397         rec->rec_type = S_IFDIR;
1398         rec->rec_fid = cfid;
1399         rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
1400                                (const struct dt_key *)dot, th);
1401         if (rc != 0)
1402                 GOTO(stop, rc);
1403
1404         rec->rec_fid = lfsck_dto2fid(parent);
1405         rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
1406                                (const struct dt_key *)dotdot, th);
1407         if (rc == 0)
1408                 rc = dt_declare_ref_add(env, orphan, th);
1409
1410         if (rc != 0)
1411                 GOTO(stop, rc);
1412
1413         rc = dt_declare_ref_add(env, orphan, th);
1414         if (rc != 0)
1415                 GOTO(stop, rc);
1416
1417         if (lmv != NULL) {
1418                 lmv->lmv_magic = LMV_MAGIC;
1419                 lmv->lmv_master_mdt_index = lfsck_dev_idx(lfsck);
1420                 lfsck_lmv_header_cpu_to_le(lmv2, lmv);
1421                 lfsck_buf_init(&lmv_buf, lmv2, sizeof(*lmv2));
1422                 rc = dt_declare_xattr_set(env, orphan, &lmv_buf,
1423                                           XATTR_NAME_LMV, 0, th);
1424                 if (rc != 0)
1425                         GOTO(stop, rc);
1426         }
1427
1428         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
1429                        ldata.ld_leh->leh_len);
1430         rc = dt_declare_xattr_set(env, orphan, &linkea_buf,
1431                                   XATTR_NAME_LINK, 0, th);
1432         if (rc != 0)
1433                 GOTO(stop, rc);
1434
1435         rec->rec_fid = cfid;
1436         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1437                                (const struct dt_key *)name, th);
1438         if (rc == 0)
1439                 rc = dt_declare_ref_add(env, parent, th);
1440
1441         if (rc != 0)
1442                 GOTO(stop, rc);
1443
1444         rc = dt_trans_start_local(env, dev, th);
1445         if (rc != 0)
1446                 GOTO(stop, rc);
1447
1448         dt_write_lock(env, orphan, 0);
1449         rc = dt_create(env, orphan, la, hint, dof, th);
1450         if (rc != 0)
1451                 GOTO(unlock2, rc);
1452
1453         rec->rec_fid = cfid;
1454         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1455                        (const struct dt_key *)dot, th, 1);
1456         if (rc != 0)
1457                 GOTO(unlock2, rc);
1458
1459         rec->rec_fid = lfsck_dto2fid(parent);
1460         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1461                        (const struct dt_key *)dotdot, th, 1);
1462         if (rc != 0)
1463                 GOTO(unlock2, rc);
1464
1465         rc = dt_ref_add(env, orphan, th);
1466         if (rc != 0)
1467                 GOTO(unlock2, rc);
1468
1469         if (lmv != NULL) {
1470                 rc = dt_xattr_set(env, orphan, &lmv_buf, XATTR_NAME_LMV, 0, th);
1471                 if (rc != 0)
1472                         GOTO(unlock2, rc);
1473         }
1474
1475         rc = dt_xattr_set(env, orphan, &linkea_buf,
1476                           XATTR_NAME_LINK, 0, th);
1477         dt_write_unlock(env, orphan);
1478         if (rc != 0)
1479                 GOTO(stop, rc);
1480
1481         rec->rec_fid = cfid;
1482         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1483                        (const struct dt_key *)name, th, 1);
1484         if (rc == 0) {
1485                 dt_write_lock(env, parent, 0);
1486                 rc = dt_ref_add(env, parent, th);
1487                 dt_write_unlock(env, parent);
1488         }
1489
1490         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1491
1492 unlock2:
1493         dt_write_unlock(env, orphan);
1494
1495 stop:
1496         dt_trans_stop(env, dev, th);
1497
1498 unlock1:
1499         lfsck_unlock(llh);
1500
1501 log:
1502         CDEBUG(D_LFSCK, "%s: namespace LFSCK create orphan dir for "
1503                "the object "DFID", name = %s: rc = %d\n",
1504                lfsck_lfsck2name(lfsck), PFID(cfid),
1505                cname->ln_name != NULL ? cname->ln_name : "<NULL>", rc);
1506
1507         if (parent != NULL && !IS_ERR(parent) && parent != lfsck->li_lpf_obj)
1508                 lfsck_object_put(env, parent);
1509
1510         if (rc != 0)
1511                 ns->ln_flags |= LF_INCONSISTENT;
1512
1513         return rc;
1514 }
1515
1516 /**
1517  * Remove the specified entry from the linkEA.
1518  *
1519  * Locate the linkEA entry with the given @cname and @pfid, then
1520  * remove this entry or the other entries those are repeated with
1521  * this entry.
1522  *
1523  * \param[in] env       pointer to the thread context
1524  * \param[in] com       pointer to the lfsck component
1525  * \param[in] obj       pointer to the dt_object to be handled
1526  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
1527  * \param[in] cname     the name for the child in the parent directory
1528  * \param[in] pfid      the parent directory's FID for the linkEA
1529  * \param[in] next      if true, then remove the first found linkEA
1530  *                      entry, and move the ldata->ld_lee to next entry
1531  *
1532  * \retval              positive number for repaired cases
1533  * \retval              0 if nothing to be repaired
1534  * \retval              negative error number on failure
1535  */
1536 static int lfsck_namespace_shrink_linkea(const struct lu_env *env,
1537                                          struct lfsck_component *com,
1538                                          struct dt_object *obj,
1539                                          struct linkea_data *ldata,
1540                                          struct lu_name *cname,
1541                                          struct lu_fid *pfid,
1542                                          bool next)
1543 {
1544         struct lfsck_instance           *lfsck     = com->lc_lfsck;
1545         struct dt_device                *dev       = lfsck_obj2dev(obj);
1546         struct lfsck_bookmark           *bk        = &lfsck->li_bookmark_ram;
1547         struct thandle                  *th        = NULL;
1548         struct lustre_handle             lh        = { 0 };
1549         struct linkea_data               ldata_new = { NULL };
1550         struct lu_buf                    linkea_buf;
1551         int                              rc        = 0;
1552         ENTRY;
1553
1554         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
1555                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
1556                               LCK_EX);
1557         if (rc != 0)
1558                 GOTO(log, rc);
1559
1560         if (next)
1561                 linkea_del_buf(ldata, cname);
1562         else
1563                 lfsck_namespace_filter_linkea_entry(ldata, cname, pfid,
1564                                                     true);
1565         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
1566                        ldata->ld_leh->leh_len);
1567
1568 again:
1569         th = dt_trans_create(env, dev);
1570         if (IS_ERR(th))
1571                 GOTO(unlock1, rc = PTR_ERR(th));
1572
1573         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1574                                   XATTR_NAME_LINK, 0, th);
1575         if (rc != 0)
1576                 GOTO(stop, rc);
1577
1578         rc = dt_trans_start_local(env, dev, th);
1579         if (rc != 0)
1580                 GOTO(stop, rc);
1581
1582         dt_write_lock(env, obj, 0);
1583         if (unlikely(lfsck_is_dead_obj(obj)))
1584                 GOTO(unlock2, rc = -ENOENT);
1585
1586         rc = lfsck_links_read2(env, obj, &ldata_new);
1587         if (rc != 0)
1588                 GOTO(unlock2, rc);
1589
1590         /* The specified linkEA entry has been removed by race. */
1591         rc = linkea_links_find(&ldata_new, cname, pfid);
1592         if (rc != 0)
1593                 GOTO(unlock2, rc = 0);
1594
1595         if (bk->lb_param & LPF_DRYRUN)
1596                 GOTO(unlock2, rc = 1);
1597
1598         if (next)
1599                 linkea_del_buf(&ldata_new, cname);
1600         else
1601                 lfsck_namespace_filter_linkea_entry(&ldata_new, cname, pfid,
1602                                                     true);
1603
1604         if (linkea_buf.lb_len < ldata_new.ld_leh->leh_len) {
1605                 dt_write_unlock(env, obj);
1606                 dt_trans_stop(env, dev, th);
1607                 lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
1608                                ldata_new.ld_leh->leh_len);
1609                 goto again;
1610         }
1611
1612         lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
1613                        ldata_new.ld_leh->leh_len);
1614         rc = dt_xattr_set(env, obj, &linkea_buf, XATTR_NAME_LINK, 0, th);
1615
1616         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
1617
1618 unlock2:
1619         dt_write_unlock(env, obj);
1620
1621 stop:
1622         dt_trans_stop(env, dev, th);
1623
1624 unlock1:
1625         lfsck_ibits_unlock(&lh, LCK_EX);
1626
1627 log:
1628         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove %s linkEA entry "
1629                "for the object: "DFID", parent "DFID", name %.*s\n",
1630                lfsck_lfsck2name(lfsck), next ? "invalid" : "redundant",
1631                PFID(lfsck_dto2fid(obj)), PFID(pfid), cname->ln_namelen,
1632                cname->ln_name);
1633
1634         if (rc != 0) {
1635                 struct lfsck_namespace *ns = com->lc_file_ram;
1636
1637                 ns->ln_flags |= LF_INCONSISTENT;
1638         }
1639
1640         return rc;
1641 }
1642
1643 /**
1644  * Conditionally remove the specified entry from the linkEA.
1645  *
1646  * Take the parent lock firstly, then check whether the specified
1647  * name entry exists or not: if yes, do nothing; otherwise, call
1648  * lfsck_namespace_shrink_linkea() to remove the linkea entry.
1649  *
1650  * \param[in] env       pointer to the thread context
1651  * \param[in] com       pointer to the lfsck component
1652  * \param[in] parent    pointer to the parent directory
1653  * \param[in] child     pointer to the child object that holds the linkEA
1654  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
1655  * \param[in] cname     the name for the child in the parent directory
1656  * \param[in] pfid      the parent directory's FID for the linkEA
1657  *
1658  * \retval              positive number for repaired cases
1659  * \retval              0 if nothing to be repaired
1660  * \retval              negative error number on failure
1661  */
1662 static int lfsck_namespace_shrink_linkea_cond(const struct lu_env *env,
1663                                               struct lfsck_component *com,
1664                                               struct dt_object *parent,
1665                                               struct dt_object *child,
1666                                               struct linkea_data *ldata,
1667                                               struct lu_name *cname,
1668                                               struct lu_fid *pfid)
1669 {
1670         struct lfsck_thread_info *info  = lfsck_env_info(env);
1671         struct lu_fid            *cfid  = &info->lti_fid3;
1672         struct lfsck_lock_handle *llh   = &info->lti_llh;
1673         int                       rc;
1674         ENTRY;
1675
1676         rc = lfsck_lock(env, com->lc_lfsck, parent, cname->ln_name, llh,
1677                         MDS_INODELOCK_UPDATE, LCK_PR);
1678         if (rc != 0)
1679                 RETURN(rc);
1680
1681         dt_read_lock(env, parent, 0);
1682         if (unlikely(lfsck_is_dead_obj(parent))) {
1683                 dt_read_unlock(env, parent);
1684                 lfsck_unlock(llh);
1685                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1686                                                    cname, pfid, true);
1687
1688                 RETURN(rc);
1689         }
1690
1691         rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
1692                        (const struct dt_key *)cname->ln_name);
1693         dt_read_unlock(env, parent);
1694
1695         /* It is safe to release the ldlm lock, because when the logic come
1696          * here, we have got all the needed information above whether the
1697          * linkEA entry is valid or not. It is not important that others
1698          * may add new linkEA entry after the ldlm lock released. If other
1699          * has removed the specified linkEA entry by race, then it is OK,
1700          * because the subsequent lfsck_namespace_shrink_linkea() can handle
1701          * such case. */
1702         lfsck_unlock(llh);
1703         if (rc == -ENOENT) {
1704                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1705                                                    cname, pfid, true);
1706
1707                 RETURN(rc);
1708         }
1709
1710         if (rc != 0)
1711                 RETURN(rc);
1712
1713         /* The LFSCK just found some internal status of cross-MDTs
1714          * create operation. That is normal. */
1715         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
1716                 linkea_next_entry(ldata);
1717
1718                 RETURN(0);
1719         }
1720
1721         rc = lfsck_namespace_shrink_linkea(env, com, child, ldata, cname,
1722                                            pfid, true);
1723
1724         RETURN(rc);
1725 }
1726
1727 /**
1728  * Conditionally replace name entry in the parent.
1729  *
1730  * As required, the LFSCK may re-create the lost MDT-object for dangling
1731  * name entry, but such repairing may be wrong because of bad FID in the
1732  * name entry. As the LFSCK processing, the real MDT-object may be found,
1733  * then the LFSCK should check whether the former re-created MDT-object
1734  * has been modified or not, if not, then destroy it and update the name
1735  * entry in the parent to reference the real MDT-object.
1736  *
1737  * \param[in] env       pointer to the thread context
1738  * \param[in] com       pointer to the lfsck component
1739  * \param[in] parent    pointer to the parent directory
1740  * \param[in] child     pointer to the MDT-object that may be the real
1741  *                      MDT-object corresponding to the name entry in parent
1742  * \param[in] cfid      the current FID in the name entry
1743  * \param[in] cname     contains the name of the child in the parent directory
1744  *
1745  * \retval              positive number for repaired cases
1746  * \retval              0 if nothing to be repaired
1747  * \retval              negative error number on failure
1748  */
1749 static int lfsck_namespace_replace_cond(const struct lu_env *env,
1750                                         struct lfsck_component *com,
1751                                         struct dt_object *parent,
1752                                         struct dt_object *child,
1753                                         const struct lu_fid *cfid,
1754                                         const struct lu_name *cname)
1755 {
1756         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1757         struct lu_attr                  *la     = &info->lti_la;
1758         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1759         struct lu_fid                    tfid;
1760         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1761         /* The child and its name may be on different MDTs. */
1762         struct dt_device                *dev    = lfsck->li_next;
1763         const char                      *name   = cname->ln_name;
1764         struct dt_object                *pobj   = NULL;
1765         struct dt_object                *cobj   = NULL;
1766         struct lfsck_lock_handle        *pllh   = &info->lti_llh;
1767         struct lustre_handle             clh    = { 0 };
1768         struct linkea_data               ldata  = { NULL };
1769         struct thandle                  *th     = NULL;
1770         bool                             exist  = true;
1771         int                              rc     = 0;
1772         ENTRY;
1773
1774         /* @parent/@child may be based on lfsck->li_bottom,
1775          * but here we need the object based on the lfsck->li_next. */
1776
1777         pobj = lfsck_object_locate(dev, parent);
1778         if (IS_ERR(pobj))
1779                 GOTO(log, rc = PTR_ERR(pobj));
1780
1781         if (unlikely(!dt_try_as_dir(env, pobj)))
1782                 GOTO(log, rc = -ENOTDIR);
1783
1784         rc = lfsck_lock(env, lfsck, parent, name, pllh,
1785                         MDS_INODELOCK_UPDATE, LCK_PW);
1786         if (rc != 0)
1787                 GOTO(log, rc);
1788
1789         if (!fid_is_sane(cfid)) {
1790                 exist = false;
1791                 goto replace;
1792         }
1793
1794         cobj = lfsck_object_find_by_dev(env, dev, cfid);
1795         if (IS_ERR(cobj)) {
1796                 rc = PTR_ERR(cobj);
1797                 if (rc == -ENOENT) {
1798                         exist = false;
1799                         goto replace;
1800                 }
1801
1802                 GOTO(log, rc);
1803         }
1804
1805         if (!dt_object_exists(cobj)) {
1806                 exist = false;
1807                 goto replace;
1808         }
1809
1810         rc = dt_lookup(env, pobj, (struct dt_rec *)&tfid,
1811                        (const struct dt_key *)name);
1812         if (rc == -ENOENT) {
1813                 exist = false;
1814                 goto replace;
1815         }
1816
1817         if (rc != 0)
1818                 GOTO(log, rc);
1819
1820         /* Someone changed the name entry, cannot replace it. */
1821         if (!lu_fid_eq(cfid, &tfid))
1822                 GOTO(log, rc = 0);
1823
1824         /* lock the object to be destroyed. */
1825         rc = lfsck_ibits_lock(env, lfsck, cobj, &clh,
1826                               MDS_INODELOCK_UPDATE |
1827                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
1828                               LCK_EX);
1829         if (rc != 0)
1830                 GOTO(log, rc);
1831
1832         if (unlikely(lfsck_is_dead_obj(cobj))) {
1833                 exist = false;
1834                 goto replace;
1835         }
1836
1837         rc = dt_attr_get(env, cobj, la);
1838         if (rc != 0)
1839                 GOTO(log, rc);
1840
1841         /* The object has been modified by other(s), or it is not created by
1842          * LFSCK, the two cases are indistinguishable. So cannot replace it. */
1843         if (la->la_ctime != 0)
1844                 GOTO(log, rc);
1845
1846         if (S_ISREG(la->la_mode)) {
1847                 rc = dt_xattr_get(env, cobj, &LU_BUF_NULL, XATTR_NAME_LOV);
1848                 /* If someone has created related OST-object(s),
1849                  * then keep it. */
1850                 if ((rc > 0) || (rc < 0 && rc != -ENODATA))
1851                         GOTO(log, rc = (rc > 0 ? 0 : rc));
1852         }
1853
1854 replace:
1855         dt_read_lock(env, child, 0);
1856         rc = lfsck_links_read2(env, child, &ldata);
1857         dt_read_unlock(env, child);
1858
1859         /* Someone changed the child, no need to replace. */
1860         if (rc == -ENODATA)
1861                 GOTO(log, rc = 0);
1862
1863         if (rc != 0)
1864                 GOTO(log, rc);
1865
1866         rc = linkea_links_find(&ldata, cname, lfsck_dto2fid(pobj));
1867         /* Someone moved the child, no need to replace. */
1868         if (rc != 0)
1869                 GOTO(log, rc = 0);
1870
1871         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1872                 GOTO(log, rc = 1);
1873
1874         th = dt_trans_create(env, dev);
1875         if (IS_ERR(th))
1876                 GOTO(log, rc = PTR_ERR(th));
1877
1878         if (exist) {
1879                 rc = dt_declare_destroy(env, cobj, th);
1880                 if (rc != 0)
1881                         GOTO(stop, rc);
1882         }
1883
1884         rc = dt_declare_delete(env, pobj, (const struct dt_key *)name, th);
1885         if (rc != 0)
1886                 GOTO(stop, rc);
1887
1888         rec->rec_type = S_IFDIR;
1889         rec->rec_fid = lfsck_dto2fid(child);
1890         rc = dt_declare_insert(env, pobj, (const struct dt_rec *)rec,
1891                                (const struct dt_key *)name, th);
1892         if (rc != 0)
1893                 GOTO(stop, rc);
1894
1895         rc = dt_trans_start_local(env, dev, th);
1896         if (rc != 0)
1897                 GOTO(stop, rc);
1898
1899         if (exist) {
1900                 rc = dt_destroy(env, cobj, th);
1901                 if (rc != 0)
1902                         GOTO(stop, rc);
1903         }
1904
1905         /* The old name entry maybe not exist. */
1906         rc = dt_delete(env, pobj, (const struct dt_key *)name, th);
1907         if (rc != 0 && rc != -ENOENT)
1908                 GOTO(stop, rc);
1909
1910         rc = dt_insert(env, pobj, (const struct dt_rec *)rec,
1911                        (const struct dt_key *)name, th, 1);
1912
1913         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1914
1915 stop:
1916         dt_trans_stop(env, dev, th);
1917
1918 log:
1919         lfsck_ibits_unlock(&clh, LCK_EX);
1920         lfsck_unlock(pllh);
1921
1922         if (cobj != NULL && !IS_ERR(cobj))
1923                 lfsck_object_put(env, cobj);
1924
1925         CDEBUG(D_LFSCK, "%s: namespace LFSCK conditionally destroy the "
1926                "object "DFID" because of conflict with the object "DFID
1927                " under the parent "DFID" with name %s: rc = %d\n",
1928                lfsck_lfsck2name(lfsck), PFID(cfid),
1929                PFID(lfsck_dto2fid(child)), PFID(lfsck_dto2fid(parent)),
1930                name, rc);
1931
1932         return rc;
1933 }
1934
1935 /**
1936  * Overwrite the linkEA for the object with the given ldata.
1937  *
1938  * The caller should take the ldlm lock before the calling.
1939  *
1940  * \param[in] env       pointer to the thread context
1941  * \param[in] com       pointer to the lfsck component
1942  * \param[in] obj       pointer to the dt_object to be handled
1943  * \param[in] ldata     pointer to the new linkEA data
1944  *
1945  * \retval              positive number for repaired cases
1946  * \retval              0 if nothing to be repaired
1947  * \retval              negative error number on failure
1948  */
1949 int lfsck_namespace_rebuild_linkea(const struct lu_env *env,
1950                                    struct lfsck_component *com,
1951                                    struct dt_object *obj,
1952                                    struct linkea_data *ldata)
1953 {
1954         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1955         struct dt_device                *dev    = lfsck_obj2dev(obj);
1956         struct thandle                  *th     = NULL;
1957         struct lu_buf                    linkea_buf;
1958         int                              rc     = 0;
1959         ENTRY;
1960
1961         th = dt_trans_create(env, dev);
1962         if (IS_ERR(th))
1963                 GOTO(log, rc = PTR_ERR(th));
1964
1965         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
1966                        ldata->ld_leh->leh_len);
1967         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1968                                   XATTR_NAME_LINK, 0, th);
1969         if (rc != 0)
1970                 GOTO(stop, rc);
1971
1972         rc = dt_trans_start_local(env, dev, th);
1973         if (rc != 0)
1974                 GOTO(stop, rc);
1975
1976         dt_write_lock(env, obj, 0);
1977         if (unlikely(lfsck_is_dead_obj(obj)))
1978                 GOTO(unlock, rc = 0);
1979
1980         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1981                 GOTO(unlock, rc = 1);
1982
1983         rc = dt_xattr_set(env, obj, &linkea_buf,
1984                           XATTR_NAME_LINK, 0, th);
1985
1986         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
1987
1988 unlock:
1989         dt_write_unlock(env, obj);
1990
1991 stop:
1992         dt_trans_stop(env, dev, th);
1993
1994 log:
1995         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild linkEA for the "
1996                "object "DFID": rc = %d\n",
1997                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
1998
1999         if (rc != 0) {
2000                 struct lfsck_namespace *ns = com->lc_file_ram;
2001
2002                 ns->ln_flags |= LF_INCONSISTENT;
2003         }
2004
2005         return rc;
2006 }
2007
2008 /**
2009  * Repair invalid name entry.
2010  *
2011  * If the name entry contains invalid information, such as bad file type
2012  * or (and) corrupted object FID, then either remove the name entry or
2013  * udpate the name entry with the given (right) information.
2014  *
2015  * \param[in] env       pointer to the thread context
2016  * \param[in] com       pointer to the lfsck component
2017  * \param[in] parent    pointer to the parent directory
2018  * \param[in] child     pointer to the object referenced by the name entry
2019  * \param[in] name      the old name of the child under the parent directory
2020  * \param[in] name2     the new name of the child under the parent directory
2021  * \param[in] type      the type claimed by the name entry
2022  * \param[in] update    update the name entry if true; otherwise, remove it
2023  * \param[in] dec       decrease the parent nlink count if true
2024  *
2025  * \retval              positive number for repaired successfully
2026  * \retval              0 if nothing to be repaired
2027  * \retval              negative error number on failure
2028  */
2029 int lfsck_namespace_repair_dirent(const struct lu_env *env,
2030                                   struct lfsck_component *com,
2031                                   struct dt_object *parent,
2032                                   struct dt_object *child,
2033                                   const char *name, const char *name2,
2034                                   __u16 type, bool update, bool dec)
2035 {
2036         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2037         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
2038         const struct lu_fid             *cfid   = lfsck_dto2fid(child);
2039         struct lu_fid                    tfid;
2040         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2041         struct dt_device                *dev    = lfsck->li_next;
2042         struct thandle                  *th     = NULL;
2043         struct lfsck_lock_handle        *llh    = &info->lti_llh;
2044         struct lustre_handle             lh     = { 0 };
2045         int                              rc     = 0;
2046         ENTRY;
2047
2048         if (unlikely(!dt_try_as_dir(env, parent)))
2049                 GOTO(log, rc = -ENOTDIR);
2050
2051         if (!update || strcmp(name, name2) == 0)
2052                 rc = lfsck_lock(env, lfsck, parent, name, llh,
2053                                 MDS_INODELOCK_UPDATE, LCK_PW);
2054         else
2055                 rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
2056                                       MDS_INODELOCK_UPDATE, LCK_PW);
2057         if (rc != 0)
2058                 GOTO(log, rc);
2059
2060         th = dt_trans_create(env, dev);
2061         if (IS_ERR(th))
2062                 GOTO(unlock1, rc = PTR_ERR(th));
2063
2064         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
2065         if (rc != 0)
2066                 GOTO(stop, rc);
2067
2068         if (update) {
2069                 rec->rec_type = lfsck_object_type(child) & S_IFMT;
2070                 rec->rec_fid = cfid;
2071                 rc = dt_declare_insert(env, parent,
2072                                        (const struct dt_rec *)rec,
2073                                        (const struct dt_key *)name2, th);
2074                 if (rc != 0)
2075                         GOTO(stop, rc);
2076         }
2077
2078         if (dec) {
2079                 rc = dt_declare_ref_del(env, parent, th);
2080                 if (rc != 0)
2081                         GOTO(stop, rc);
2082         }
2083
2084         rc = dt_trans_start_local(env, dev, th);
2085         if (rc != 0)
2086                 GOTO(stop, rc);
2087
2088         dt_write_lock(env, parent, 0);
2089         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
2090                        (const struct dt_key *)name);
2091         /* Someone has removed the bad name entry by race. */
2092         if (rc == -ENOENT)
2093                 GOTO(unlock2, rc = 0);
2094
2095         if (rc != 0)
2096                 GOTO(unlock2, rc);
2097
2098         /* Someone has removed the bad name entry and reused it for other
2099          * object by race. */
2100         if (!lu_fid_eq(&tfid, cfid))
2101                 GOTO(unlock2, rc = 0);
2102
2103         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2104                 GOTO(unlock2, rc = 1);
2105
2106         rc = dt_delete(env, parent, (const struct dt_key *)name, th);
2107         if (rc != 0)
2108                 GOTO(unlock2, rc);
2109
2110         if (update) {
2111                 rc = dt_insert(env, parent,
2112                                (const struct dt_rec *)rec,
2113                                (const struct dt_key *)name2, th, 1);
2114                 if (rc != 0)
2115                         GOTO(unlock2, rc);
2116         }
2117
2118         if (dec) {
2119                 rc = dt_ref_del(env, parent, th);
2120                 if (rc != 0)
2121                         GOTO(unlock2, rc);
2122         }
2123
2124         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
2125
2126 unlock2:
2127         dt_write_unlock(env, parent);
2128
2129 stop:
2130         dt_trans_stop(env, dev, th);
2131
2132         /* We are not sure whether the child will become orphan or not.
2133          * Record it in the LFSCK trace file for further checking in
2134          * the second-stage scanning. */
2135         if (!update && !dec && rc == 0)
2136                 lfsck_namespace_trace_update(env, com, cfid,
2137                                              LNTF_CHECK_LINKEA, true);
2138
2139 unlock1:
2140         /* It is harmless even if unlock the unused lock_handle */
2141         lfsck_ibits_unlock(&lh, LCK_PW);
2142         lfsck_unlock(llh);
2143
2144 log:
2145         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found bad name "
2146                "entry for: parent "DFID", child "DFID", name %s, type "
2147                "in name entry %o, type claimed by child %o. repair it "
2148                "by %s with new name2 %s: rc = %d\n", lfsck_lfsck2name(lfsck),
2149                PFID(lfsck_dto2fid(parent)), PFID(lfsck_dto2fid(child)),
2150                name, type, update ? lfsck_object_type(child) : 0,
2151                update ? "updating" : "removing", name2, rc);
2152
2153         if (rc != 0) {
2154                 struct lfsck_namespace *ns = com->lc_file_ram;
2155
2156                 ns->ln_flags |= LF_INCONSISTENT;
2157         }
2158
2159         return rc;
2160 }
2161
2162 /**
2163  * Update the ".." name entry for the given object.
2164  *
2165  * The object's ".." is corrupted, this function will update the ".." name
2166  * entry with the given pfid, and the linkEA with the given ldata.
2167  *
2168  * The caller should take the ldlm lock before the calling.
2169  *
2170  * \param[in] env       pointer to the thread context
2171  * \param[in] com       pointer to the lfsck component
2172  * \param[in] obj       pointer to the dt_object to be handled
2173  * \param[in] pfid      the new fid for the object's ".." name entry
2174  * \param[in] cname     the name for the @obj in the parent directory
2175  *
2176  * \retval              positive number for repaired cases
2177  * \retval              0 if nothing to be repaired
2178  * \retval              negative error number on failure
2179  */
2180 static int lfsck_namespace_repair_unmatched_pairs(const struct lu_env *env,
2181                                                   struct lfsck_component *com,
2182                                                   struct dt_object *obj,
2183                                                   const struct lu_fid *pfid,
2184                                                   struct lu_name *cname)
2185 {
2186         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2187         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
2188         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2189         struct dt_device                *dev    = lfsck_obj2dev(obj);
2190         struct thandle                  *th     = NULL;
2191         struct linkea_data               ldata  = { NULL };
2192         struct lu_buf                    linkea_buf;
2193         int                              rc     = 0;
2194         ENTRY;
2195
2196         LASSERT(!dt_object_remote(obj));
2197         LASSERT(S_ISDIR(lfsck_object_type(obj)));
2198
2199         rc = linkea_data_new(&ldata, &info->lti_big_buf);
2200         if (rc != 0)
2201                 GOTO(log, rc);
2202
2203         rc = linkea_add_buf(&ldata, cname, pfid);
2204         if (rc != 0)
2205                 GOTO(log, rc);
2206
2207         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
2208                        ldata.ld_leh->leh_len);
2209
2210         th = dt_trans_create(env, dev);
2211         if (IS_ERR(th))
2212                 GOTO(log, rc = PTR_ERR(th));
2213
2214         rc = dt_declare_delete(env, obj, (const struct dt_key *)dotdot, th);
2215         if (rc != 0)
2216                 GOTO(stop, rc);
2217
2218         rec->rec_type = S_IFDIR;
2219         rec->rec_fid = pfid;
2220         rc = dt_declare_insert(env, obj, (const struct dt_rec *)rec,
2221                                (const struct dt_key *)dotdot, th);
2222         if (rc != 0)
2223                 GOTO(stop, rc);
2224
2225         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
2226                                   XATTR_NAME_LINK, 0, th);
2227         if (rc != 0)
2228                 GOTO(stop, rc);
2229
2230         rc = dt_trans_start_local(env, dev, th);
2231         if (rc != 0)
2232                 GOTO(stop, rc);
2233
2234         dt_write_lock(env, obj, 0);
2235         if (unlikely(lfsck_is_dead_obj(obj)))
2236                 GOTO(unlock, rc = 0);
2237
2238         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2239                 GOTO(unlock, rc = 1);
2240
2241         /* The old ".." name entry maybe not exist. */
2242         dt_delete(env, obj, (const struct dt_key *)dotdot, th);
2243
2244         rc = dt_insert(env, obj, (const struct dt_rec *)rec,
2245                        (const struct dt_key *)dotdot, th, 1);
2246         if (rc != 0)
2247                 GOTO(unlock, rc);
2248
2249         rc = dt_xattr_set(env, obj, &linkea_buf,
2250                           XATTR_NAME_LINK, 0, th);
2251
2252         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2253
2254 unlock:
2255         dt_write_unlock(env, obj);
2256
2257 stop:
2258         dt_trans_stop(env, dev, th);
2259
2260 log:
2261         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild dotdot name entry for "
2262                "the object "DFID", new parent "DFID": rc = %d\n",
2263                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)),
2264                PFID(pfid), rc);
2265
2266         if (rc != 0) {
2267                 struct lfsck_namespace *ns = com->lc_file_ram;
2268
2269                 ns->ln_flags |= LF_INCONSISTENT;
2270         }
2271
2272         return rc;
2273 }
2274
2275 /**
2276  * Handle orphan @obj during Double Scan Directory.
2277  *
2278  * Remove the @obj's current (invalid) linkEA entries, and insert
2279  * it in the directory .lustre/lost+found/MDTxxxx/ with the name:
2280  * ${FID}-${PFID}-D-${conflict_version}
2281  *
2282  * The caller should take the ldlm lock before the calling.
2283  *
2284  * \param[in] env       pointer to the thread context
2285  * \param[in] com       pointer to the lfsck component
2286  * \param[in] obj       pointer to the orphan object to be handled
2287  * \param[in] pfid      the new fid for the object's ".." name entry
2288  * \param[in,out] lh    ldlm lock handler for the given @obj
2289  * \param[out] type     to tell the caller what the inconsistency is
2290  *
2291  * \retval              positive number for repaired cases
2292  * \retval              0 if nothing to be repaired
2293  * \retval              negative error number on failure
2294  */
2295 static int
2296 lfsck_namespace_dsd_orphan(const struct lu_env *env,
2297                            struct lfsck_component *com,
2298                            struct dt_object *obj,
2299                            const struct lu_fid *pfid,
2300                            struct lustre_handle *lh,
2301                            enum lfsck_namespace_inconsistency_type *type)
2302 {
2303         struct lfsck_thread_info *info = lfsck_env_info(env);
2304         struct lfsck_namespace   *ns   = com->lc_file_ram;
2305         int                       rc;
2306         ENTRY;
2307
2308         /* Remove the unrecognized linkEA. */
2309         rc = lfsck_namespace_links_remove(env, com, obj);
2310         lfsck_ibits_unlock(lh, LCK_EX);
2311         if (rc < 0 && rc != -ENODATA)
2312                 RETURN(rc);
2313
2314         *type = LNIT_MUL_REF;
2315
2316         /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT has
2317          * ever tried to verify some remote MDT-object that resides on this
2318          * MDT, but this MDT failed to respond such request. So means there
2319          * may be some remote name entry on other MDT that references this
2320          * object with another name, so we cannot know whether this linkEA
2321          * is valid or not. So keep it there and maybe resolved when next
2322          * LFSCK run. */
2323         if (ns->ln_flags & LF_INCOMPLETE)
2324                 RETURN(0);
2325
2326         /* The unique linkEA is invalid, even if the ".." name entry may be
2327          * valid, we still cannot know via which name entry this directory
2328          * will be referenced. Then handle it as pure orphan. */
2329         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2330                  "-"DFID, PFID(pfid));
2331         rc = lfsck_namespace_insert_orphan(env, com, obj,
2332                                            info->lti_tmpbuf, "D", NULL);
2333
2334         RETURN(rc);
2335 }
2336
2337 /**
2338  * Double Scan Directory object for single linkEA entry case.
2339  *
2340  * The given @child has unique linkEA entry. If the linkEA entry is valid,
2341  * then check whether the name is in the namespace or not, if not, add the
2342  * missing name entry back to namespace. If the linkEA entry is invalid,
2343  * then remove it and insert the @child in the .lustre/lost+found/MDTxxxx/
2344  * as an orphan.
2345  *
2346  * \param[in] env       pointer to the thread context
2347  * \param[in] com       pointer to the lfsck component
2348  * \param[in] child     pointer to the directory to be double scanned
2349  * \param[in] pfid      the FID corresponding to the ".." entry
2350  * \param[in] ldata     pointer to the linkEA data for the given @child
2351  * \param[in,out] lh    ldlm lock handler for the given @child
2352  * \param[out] type     to tell the caller what the inconsistency is
2353  * \param[in] retry     if found inconsistency, but the caller does not hold
2354  *                      ldlm lock on the @child, then set @retry as true
2355  *
2356  * \retval              positive number for repaired cases
2357  * \retval              0 if nothing to be repaired
2358  * \retval              negative error number on failure
2359  */
2360 static int
2361 lfsck_namespace_dsd_single(const struct lu_env *env,
2362                            struct lfsck_component *com,
2363                            struct dt_object *child,
2364                            const struct lu_fid *pfid,
2365                            struct linkea_data *ldata,
2366                            struct lustre_handle *lh,
2367                            enum lfsck_namespace_inconsistency_type *type,
2368                            bool *retry)
2369 {
2370         struct lfsck_thread_info *info          = lfsck_env_info(env);
2371         struct lu_name           *cname         = &info->lti_name;
2372         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2373         struct lu_fid             tfid;
2374         struct lfsck_namespace   *ns            = com->lc_file_ram;
2375         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2376         struct dt_object         *parent        = NULL;
2377         struct lmv_mds_md_v1     *lmv;
2378         int                       rc            = 0;
2379         ENTRY;
2380
2381         lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid, info->lti_key);
2382         /* The unique linkEA entry with bad parent will be handled as orphan. */
2383         if (!fid_is_sane(&tfid)) {
2384                 if (!lustre_handle_is_used(lh) && retry != NULL)
2385                         *retry = true;
2386                 else
2387                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2388                                                         pfid, lh, type);
2389
2390                 GOTO(out, rc);
2391         }
2392
2393         parent = lfsck_object_find_bottom(env, lfsck, &tfid);
2394         if (IS_ERR(parent))
2395                 GOTO(out, rc = PTR_ERR(parent));
2396
2397         /* We trust the unique linkEA entry in spite of whether it matches the
2398          * ".." name entry or not. Because even if the linkEA entry is wrong
2399          * and the ".." name entry is right, we still cannot know via which
2400          * name entry the child will be referenced, since all known entries
2401          * have been verified during the first-stage scanning. */
2402         if (!dt_object_exists(parent)) {
2403                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT
2404                  * has ever tried to verify some remote MDT-object that resides
2405                  * on this MDT, but this MDT failed to respond such request. So
2406                  * means there may be some remote name entry on other MDT that
2407                  * references this object with another name, so we cannot know
2408                  * whether this linkEA is valid or not. So keep it there and
2409                  * maybe resolved when next LFSCK run. */
2410                 if (ns->ln_flags & LF_INCOMPLETE)
2411                         GOTO(out, rc = 0);
2412
2413                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2414                         *retry = true;
2415
2416                         GOTO(out, rc = 0);
2417                 }
2418
2419                 lfsck_ibits_unlock(lh, LCK_EX);
2420
2421 lost_parent:
2422                 lmv = &info->lti_lmv;
2423                 rc = lfsck_read_stripe_lmv(env, child, lmv);
2424                 if (rc != 0 && rc != -ENODATA)
2425                         GOTO(out, rc);
2426
2427                 if (rc == -ENODATA || lmv->lmv_magic != LMV_MAGIC_STRIPE) {
2428                         lmv = NULL;
2429                 } else if (lfsck_shard_name_to_index(env,
2430                                         cname->ln_name, cname->ln_namelen,
2431                                         S_IFDIR, cfid) < 0) {
2432                         /* It is an invalid name entry, we
2433                          * cannot trust the parent also. */
2434                         rc = lfsck_namespace_shrink_linkea(env, com, child,
2435                                                 ldata, cname, &tfid, true);
2436                         if (rc < 0)
2437                                 GOTO(out, rc);
2438
2439                         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2440                                  "-"DFID, PFID(pfid));
2441                         rc = lfsck_namespace_insert_orphan(env, com, child,
2442                                                 info->lti_tmpbuf, "S", NULL);
2443
2444                         GOTO(out, rc);
2445                 }
2446
2447                 /* Create the lost parent as an orphan. */
2448                 rc = lfsck_namespace_create_orphan_dir(env, com, parent, lmv);
2449                 if (rc >= 0) {
2450                         /* Add the missing name entry to the parent. */
2451                         rc = lfsck_namespace_insert_normal(env, com, parent,
2452                                                         child, cname->ln_name);
2453                         if (unlikely(rc == -EEXIST)) {
2454                                 /* Unfortunately, someone reused the name
2455                                  * under the parent by race. So we have
2456                                  * to remove the linkEA entry from
2457                                  * current child object. It means that the
2458                                  * LFSCK cannot recover the system
2459                                  * totally back to its original status,
2460                                  * but it is necessary to make the
2461                                  * current system to be consistent. */
2462                                 rc = lfsck_namespace_shrink_linkea(env,
2463                                                 com, child, ldata,
2464                                                 cname, &tfid, true);
2465                                 if (rc >= 0) {
2466                                         snprintf(info->lti_tmpbuf,
2467                                                  sizeof(info->lti_tmpbuf),
2468                                                  "-"DFID, PFID(pfid));
2469                                         rc = lfsck_namespace_insert_orphan(env,
2470                                                 com, child, info->lti_tmpbuf,
2471                                                 "D", NULL);
2472                                 }
2473                         }
2474                 }
2475
2476                 GOTO(out, rc);
2477         }
2478
2479         /* The unique linkEA entry with bad parent will be handled as orphan. */
2480         if (unlikely(!dt_try_as_dir(env, parent))) {
2481                 if (!lustre_handle_is_used(lh) && retry != NULL)
2482                         *retry = true;
2483                 else
2484                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2485                                                         pfid, lh, type);
2486
2487                 GOTO(out, rc);
2488         }
2489
2490         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
2491                        (const struct dt_key *)cname->ln_name);
2492         if (rc == -ENOENT) {
2493                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT
2494                  * has ever tried to verify some remote MDT-object that resides
2495                  * on this MDT, but this MDT failed to respond such request. So
2496                  * means there may be some remote name entry on other MDT that
2497                  * references this object with another name, so we cannot know
2498                  * whether this linkEA is valid or not. So keep it there and
2499                  * maybe resolved when next LFSCK run. */
2500                 if (ns->ln_flags & LF_INCOMPLETE)
2501                         GOTO(out, rc = 0);
2502
2503                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2504                         *retry = true;
2505
2506                         GOTO(out, rc = 0);
2507                 }
2508
2509                 lfsck_ibits_unlock(lh, LCK_EX);
2510                 rc = lfsck_namespace_check_name(env, parent, child, cname);
2511                 if (rc == -ENOENT)
2512                         goto lost_parent;
2513
2514                 if (rc < 0)
2515                         GOTO(out, rc);
2516
2517                 /* It is an invalid name entry, drop it. */
2518                 if (unlikely(rc > 0)) {
2519                         rc = lfsck_namespace_shrink_linkea(env, com, child,
2520                                                 ldata, cname, &tfid, true);
2521                         if (rc >= 0) {
2522                                 snprintf(info->lti_tmpbuf,
2523                                          sizeof(info->lti_tmpbuf),
2524                                          "-"DFID, PFID(pfid));
2525                                 rc = lfsck_namespace_insert_orphan(env, com,
2526                                         child, info->lti_tmpbuf, "D", NULL);
2527                         }
2528
2529                         GOTO(out, rc);
2530                 }
2531
2532                 /* Add the missing name entry back to the namespace. */
2533                 rc = lfsck_namespace_insert_normal(env, com, parent, child,
2534                                                    cname->ln_name);
2535                 if (unlikely(rc == -ESTALE))
2536                         /* It may happen when the remote object has been
2537                          * removed, but the local MDT is not aware of that. */
2538                         goto lost_parent;
2539
2540                 if (unlikely(rc == -EEXIST)) {
2541                         /* Unfortunately, someone reused the name under the
2542                          * parent by race. So we have to remove the linkEA
2543                          * entry from current child object. It means that the
2544                          * LFSCK cannot recover the system totally back to
2545                          * its original status, but it is necessary to make
2546                          * the current system to be consistent.
2547                          *
2548                          * It also may be because of the LFSCK found some
2549                          * internal status of create operation. Under such
2550                          * case, nothing to be done. */
2551                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
2552                                         parent, child, ldata, cname, &tfid);
2553                         if (rc >= 0) {
2554                                 snprintf(info->lti_tmpbuf,
2555                                          sizeof(info->lti_tmpbuf),
2556                                          "-"DFID, PFID(pfid));
2557                                 rc = lfsck_namespace_insert_orphan(env, com,
2558                                         child, info->lti_tmpbuf, "D", NULL);
2559                         }
2560                 }
2561
2562                 GOTO(out, rc);
2563         }
2564
2565         if (rc != 0)
2566                 GOTO(out, rc);
2567
2568         if (!lu_fid_eq(&tfid, cfid)) {
2569                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2570                         *retry = true;
2571
2572                         GOTO(out, rc = 0);
2573                 }
2574
2575                 lfsck_ibits_unlock(lh, LCK_EX);
2576                 /* The name entry references another MDT-object that
2577                  * may be created by the LFSCK for repairing dangling
2578                  * name entry. Try to replace it. */
2579                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
2580                                                   &tfid, cname);
2581                 if (rc == 0)
2582                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2583                                                         pfid, lh, type);
2584
2585                 GOTO(out, rc);
2586         }
2587
2588         if (fid_is_zero(pfid))
2589                 GOTO(out, rc = 0);
2590
2591         /* The ".." name entry is wrong, update it. */
2592         if (!lu_fid_eq(pfid, lfsck_dto2fid(parent))) {
2593                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2594                         *retry = true;
2595
2596                         GOTO(out, rc = 0);
2597                 }
2598
2599                 *type = LNIT_UNMATCHED_PAIRS;
2600                 rc = lfsck_namespace_repair_unmatched_pairs(env, com, child,
2601                                                 lfsck_dto2fid(parent), cname);
2602         }
2603
2604         GOTO(out, rc);
2605
2606 out:
2607         if (parent != NULL && !IS_ERR(parent))
2608                 lfsck_object_put(env, parent);
2609
2610         return rc;
2611 }
2612
2613 /**
2614  * Double Scan Directory object for multiple linkEA entries case.
2615  *
2616  * The given @child has multiple linkEA entries. There is at most one linkEA
2617  * entry will be valid, all the others will be removed. Firstly, the function
2618  * will try to find out the linkEA entry for which the name entry exists under
2619  * the given parent (@pfid). If there is no linkEA entry that matches the given
2620  * ".." name entry, then tries to find out the first linkEA entry that both the
2621  * parent and the name entry exist to rebuild a new ".." name entry.
2622  *
2623  * \param[in] env       pointer to the thread context
2624  * \param[in] com       pointer to the lfsck component
2625  * \param[in] child     pointer to the directory to be double scanned
2626  * \param[in] pfid      the FID corresponding to the ".." entry
2627  * \param[in] ldata     pointer to the linkEA data for the given @child
2628  * \param[in,out] lh    ldlm lock handler for the given @child
2629  * \param[out] type     to tell the caller what the inconsistency is
2630  * \param[in] lpf       true if the ".." entry is under lost+found/MDTxxxx/
2631  *
2632  * \retval              positive number for repaired cases
2633  * \retval              0 if nothing to be repaired
2634  * \retval              negative error number on failure
2635  */
2636 static int
2637 lfsck_namespace_dsd_multiple(const struct lu_env *env,
2638                              struct lfsck_component *com,
2639                              struct dt_object *child,
2640                              const struct lu_fid *pfid,
2641                              struct linkea_data *ldata,
2642                              struct lustre_handle *lh,
2643                              enum lfsck_namespace_inconsistency_type *type,
2644                              bool lpf)
2645 {
2646         struct lfsck_thread_info *info          = lfsck_env_info(env);
2647         struct lu_name           *cname         = &info->lti_name;
2648         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2649         struct lu_fid            *pfid2         = &info->lti_fid3;
2650         struct lu_fid             tfid;
2651         struct lfsck_namespace   *ns            = com->lc_file_ram;
2652         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2653         struct lfsck_bookmark    *bk            = &lfsck->li_bookmark_ram;
2654         struct dt_object         *parent        = NULL;
2655         struct linkea_data        ldata_new     = { NULL };
2656         int                       dirent_count  = 0;
2657         int                       linkea_count  = 0;
2658         int                       rc            = 0;
2659         bool                      once          = true;
2660         ENTRY;
2661
2662 again:
2663         while (ldata->ld_lee != NULL) {
2664                 lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid,
2665                                                     info->lti_key);
2666                 /* Drop repeated linkEA entries. */
2667                 lfsck_namespace_filter_linkea_entry(ldata, cname, &tfid, true);
2668                 /* Drop invalid linkEA entry. */
2669                 if (!fid_is_sane(&tfid)) {
2670                         linkea_del_buf(ldata, cname);
2671                         linkea_count++;
2672                         continue;
2673                 }
2674
2675                 /* If current dotdot is the .lustre/lost+found/MDTxxxx/,
2676                  * then it is possible that: the directry object has ever
2677                  * been lost, but its name entry was there. In the former
2678                  * LFSCK run, during the first-stage scanning, the LFSCK
2679                  * found the dangling name entry, but it did not recreate
2680                  * the lost object, and when moved to the second-stage
2681                  * scanning, some children objects of the lost directory
2682                  * object were found, then the LFSCK recreated such lost
2683                  * directory object as an orphan.
2684                  *
2685                  * When the LFSCK runs again, if the dangling name is still
2686                  * there, the LFSCK should move the orphan directory object
2687                  * back to the normal namespace. */
2688                 if (!lpf && !lu_fid_eq(pfid, &tfid) && once) {
2689                         linkea_next_entry(ldata);
2690                         continue;
2691                 }
2692
2693                 parent = lfsck_object_find_bottom(env, lfsck, &tfid);
2694                 if (IS_ERR(parent))
2695                         RETURN(PTR_ERR(parent));
2696
2697                 if (!dt_object_exists(parent)) {
2698                         lfsck_object_put(env, parent);
2699                         if (ldata->ld_leh->leh_reccount > 1) {
2700                                 /* If it is NOT the last linkEA entry, then
2701                                  * there is still other chance to make the
2702                                  * child to be visible via other parent, then
2703                                  * remove this linkEA entry. */
2704                                 linkea_del_buf(ldata, cname);
2705                                 linkea_count++;
2706                                 continue;
2707                         }
2708
2709                         break;
2710                 }
2711
2712                 /* The linkEA entry with bad parent will be removed. */
2713                 if (unlikely(!dt_try_as_dir(env, parent))) {
2714                         lfsck_object_put(env, parent);
2715                         linkea_del_buf(ldata, cname);
2716                         linkea_count++;
2717                         continue;
2718                 }
2719
2720                 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
2721                                (const struct dt_key *)cname->ln_name);
2722                 *pfid2 = *lfsck_dto2fid(parent);
2723                 if (rc == -ENOENT) {
2724                         lfsck_object_put(env, parent);
2725                         linkea_next_entry(ldata);
2726                         continue;
2727                 }
2728
2729                 if (rc != 0) {
2730                         lfsck_object_put(env, parent);
2731
2732                         RETURN(rc);
2733                 }
2734
2735                 if (lu_fid_eq(&tfid, cfid)) {
2736                         lfsck_object_put(env, parent);
2737                         if (!lu_fid_eq(pfid, pfid2)) {
2738                                 *type = LNIT_UNMATCHED_PAIRS;
2739                                 rc = lfsck_namespace_repair_unmatched_pairs(env,
2740                                                 com, child, pfid2, cname);
2741
2742                                 RETURN(rc);
2743                         }
2744
2745 rebuild:
2746                         /* It is the most common case that we find the
2747                          * name entry corresponding to the linkEA entry
2748                          * that matches the ".." name entry. */
2749                         rc = linkea_data_new(&ldata_new, &info->lti_big_buf);
2750                         if (rc != 0)
2751                                 RETURN(rc);
2752
2753                         rc = linkea_add_buf(&ldata_new, cname, pfid2);
2754                         if (rc != 0)
2755                                 RETURN(rc);
2756
2757                         rc = lfsck_namespace_rebuild_linkea(env, com, child,
2758                                                             &ldata_new);
2759                         if (rc < 0)
2760                                 RETURN(rc);
2761
2762                         linkea_del_buf(ldata, cname);
2763                         linkea_count++;
2764                         linkea_first_entry(ldata);
2765                         /* There may be some invalid dangling name entries under
2766                          * other parent directories, remove all of them. */
2767                         while (ldata->ld_lee != NULL) {
2768                                 lfsck_namespace_unpack_linkea_entry(ldata,
2769                                                 cname, &tfid, info->lti_key);
2770                                 if (!fid_is_sane(&tfid))
2771                                         goto next;
2772
2773                                 parent = lfsck_object_find_bottom(env, lfsck,
2774                                                                   &tfid);
2775                                 if (IS_ERR(parent)) {
2776                                         rc = PTR_ERR(parent);
2777                                         if (rc != -ENOENT &&
2778                                             bk->lb_param & LPF_FAILOUT)
2779                                                 RETURN(rc);
2780
2781                                         goto next;
2782                                 }
2783
2784                                 if (!dt_object_exists(parent)) {
2785                                         lfsck_object_put(env, parent);
2786                                         goto next;
2787                                 }
2788
2789                                 rc = lfsck_namespace_repair_dirent(env, com,
2790                                         parent, child, cname->ln_name,
2791                                         cname->ln_name, S_IFDIR, false, true);
2792                                 lfsck_object_put(env, parent);
2793                                 if (rc < 0) {
2794                                         if (bk->lb_param & LPF_FAILOUT)
2795                                                 RETURN(rc);
2796
2797                                         goto next;
2798                                 }
2799
2800                                 dirent_count += rc;
2801
2802 next:
2803                                 linkea_del_buf(ldata, cname);
2804                         }
2805
2806                         ns->ln_dirent_repaired += dirent_count;
2807
2808                         RETURN(rc);
2809                 }
2810
2811                 lfsck_ibits_unlock(lh, LCK_EX);
2812                 /* The name entry references another MDT-object that may be
2813                  * created by the LFSCK for repairing dangling name entry.
2814                  * Try to replace it. */
2815                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
2816                                                   &tfid, cname);
2817                 lfsck_object_put(env, parent);
2818                 if (rc < 0)
2819                         RETURN(rc);
2820
2821                 if (rc > 0)
2822                         goto rebuild;
2823
2824                 linkea_del_buf(ldata, cname);
2825         }
2826
2827         linkea_first_entry(ldata);
2828         if (ldata->ld_leh->leh_reccount == 1) {
2829                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, ldata,
2830                                                 lh, type, NULL);
2831
2832                 if (rc == 0 && fid_is_zero(pfid) && linkea_count > 0)
2833                         rc = lfsck_namespace_rebuild_linkea(env, com, child,
2834                                                             ldata);
2835
2836                 RETURN(rc);
2837         }
2838
2839         /* All linkEA entries are invalid and removed, then handle the @child
2840          * as an orphan.*/
2841         if (ldata->ld_leh->leh_reccount == 0) {
2842                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, lh,
2843                                                 type);
2844
2845                 RETURN(rc);
2846         }
2847
2848         /* If the dangling name entry for the orphan directory object has
2849          * been remvoed, then just check whether the directory object is
2850          * still under the .lustre/lost+found/MDTxxxx/ or not. */
2851         if (lpf) {
2852                 lpf = false;
2853                 goto again;
2854         }
2855
2856         /* There is no linkEA entry that matches the ".." name entry. Find
2857          * the first linkEA entry that both parent and name entry exist to
2858          * rebuild a new ".." name entry. */
2859         if (once) {
2860                 once = false;
2861                 goto again;
2862         }
2863
2864         RETURN(rc);
2865 }
2866
2867 /**
2868  * Repair the object's nlink attribute.
2869  *
2870  * If all the known name entries have been verified, then the object's hard
2871  * link attribute should match the object's linkEA entries count unless the
2872  * object's has too much hard link to be recorded in the linkEA. Such cases
2873  * should have been marked in the LFSCK trace file. Otherwise, trust the
2874  * linkEA to update the object's nlink attribute.
2875  *
2876  * \param[in] env       pointer to the thread context
2877  * \param[in] com       pointer to the lfsck component
2878  * \param[in] obj       pointer to the dt_object to be handled
2879  * \param[in,out] la    pointer to buffer to object's attribute before
2880  *                      and after the repairing
2881  *
2882  * \retval              positive number for repaired cases
2883  * \retval              0 if nothing to be repaired
2884  * \retval              negative error number on failure
2885  */
2886 static int lfsck_namespace_repair_nlink(const struct lu_env *env,
2887                                         struct lfsck_component *com,
2888                                         struct dt_object *obj,
2889                                         struct lu_attr *la)
2890 {
2891         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2892         struct lu_fid                   *tfid   = &info->lti_fid3;
2893         struct lfsck_namespace          *ns     = com->lc_file_ram;
2894         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2895         struct dt_device                *dev    = lfsck_obj2dev(obj);
2896         const struct lu_fid             *cfid   = lfsck_dto2fid(obj);
2897         struct thandle                  *th     = NULL;
2898         struct linkea_data               ldata  = { NULL };
2899         struct lustre_handle             lh     = { 0 };
2900         __u32                            old    = la->la_nlink;
2901         int                              idx;
2902         int                              rc     = 0;
2903         __u8                             flags;
2904         ENTRY;
2905
2906         LASSERT(!dt_object_remote(obj));
2907         LASSERT(S_ISREG(lfsck_object_type(obj)));
2908
2909         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
2910                               MDS_INODELOCK_UPDATE, LCK_PW);
2911         if (rc != 0)
2912                 GOTO(log, rc);
2913
2914         th = dt_trans_create(env, dev);
2915         if (IS_ERR(th))
2916                 GOTO(log, rc = PTR_ERR(th));
2917
2918         la->la_valid = LA_NLINK;
2919         rc = dt_declare_attr_set(env, obj, la, th);
2920         if (rc != 0)
2921                 GOTO(stop, rc);
2922
2923         rc = dt_trans_start_local(env, dev, th);
2924         if (rc != 0)
2925                 GOTO(stop, rc);
2926
2927         dt_write_lock(env, obj, 0);
2928         /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT has
2929          * ever tried to verify some remote MDT-object that resides on this
2930          * MDT, but this MDT failed to respond such request. So means there
2931          * may be some remote name entry on other MDT that references this
2932          * object with another name, so we cannot know whether this linkEA
2933          * is valid or not. So keep it there and maybe resolved when next
2934          * LFSCK run. */
2935         if (ns->ln_flags & LF_INCOMPLETE)
2936                 GOTO(unlock, rc = 0);
2937
2938         fid_cpu_to_be(tfid, cfid);
2939         idx = lfsck_sub_trace_file_fid2idx(cfid);
2940         rc = dt_lookup(env, com->lc_sub_trace_objs[idx].lsto_obj,
2941                        (struct dt_rec *)&flags, (const struct dt_key *)tfid);
2942         if (rc != 0)
2943                 GOTO(unlock, rc);
2944
2945         if (flags & LNTF_SKIP_NLINK)
2946                 GOTO(unlock, rc = 0);
2947
2948         rc = dt_attr_get(env, obj, la);
2949         if (rc != 0)
2950                 GOTO(unlock, rc = (rc == -ENOENT ? 0 : rc));
2951
2952         rc = lfsck_links_read2(env, obj, &ldata);
2953         if (rc != 0)
2954                 GOTO(unlock, rc = (rc == -ENODATA ? 0 : rc));
2955
2956         if (la->la_nlink == ldata.ld_leh->leh_reccount ||
2957             unlikely(la->la_nlink == 0))
2958                 GOTO(unlock, rc = 0);
2959
2960         la->la_nlink = ldata.ld_leh->leh_reccount;
2961         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2962                 GOTO(unlock, rc = 1);
2963
2964         rc = dt_attr_set(env, obj, la, th);
2965
2966         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2967
2968 unlock:
2969         dt_write_unlock(env, obj);
2970
2971 stop:
2972         dt_trans_stop(env, dev, th);
2973
2974 log:
2975         lfsck_ibits_unlock(&lh, LCK_PW);
2976         CDEBUG(D_LFSCK, "%s: namespace LFSCK repaired the object "DFID"'s "
2977                "nlink count from %u to %u: rc = %d\n",
2978                lfsck_lfsck2name(lfsck), PFID(cfid), old, la->la_nlink, rc);
2979
2980         if (rc != 0)
2981                 ns->ln_flags |= LF_INCONSISTENT;
2982
2983         return rc;
2984 }
2985
2986 /**
2987  * Double scan the directory object for namespace LFSCK.
2988  *
2989  * This function will verify the <parent, child> pairs in the namespace tree:
2990  * the parent references the child via some name entry that should be in the
2991  * child's linkEA entry, the child should back references the parent via its
2992  * ".." name entry.
2993  *
2994  * The LFSCK will scan every linkEA entry in turn until find out the first
2995  * matched pairs. If found, then all other linkEA entries will be dropped.
2996  * If all the linkEA entries cannot match the ".." name entry, then there
2997  * are serveral possible cases:
2998  *
2999  * 1) If there is only one linkEA entry, then trust it as long as the PFID
3000  *    in the linkEA entry is valid.
3001  *
3002  * 2) If there are multiple linkEA entries, then try to find the linkEA
3003  *    that matches the ".." name entry. If found, then all other entries
3004  *    are invalid; otherwise, it is quite possible that the ".." name entry
3005  *    is corrupted. Under such case, the LFSCK will rebuild the ".." name
3006  *    entry according to the first valid linkEA entry (both the parent and
3007  *    the name entry should exist).
3008  *
3009  * 3) If the directory object has no (valid) linkEA entry, then the
3010  *    directory object will be handled as pure orphan and inserted
3011  *    in the .lustre/lost+found/MDTxxxx/ with the name:
3012  *    ${self_FID}-${PFID}-D-${conflict_version}
3013  *
3014  * \param[in] env       pointer to the thread context
3015  * \param[in] com       pointer to the lfsck component
3016  * \param[in] child     pointer to the directory object to be handled
3017  * \param[in] flags     to indicate the specical checking on the @child
3018  *
3019  * \retval              positive number for repaired cases
3020  * \retval              0 if nothing to be repaired
3021  * \retval              negative error number on failure
3022  */
3023 static int lfsck_namespace_double_scan_dir(const struct lu_env *env,
3024                                            struct lfsck_component *com,
3025                                            struct dt_object *child, __u8 flags)
3026 {
3027         struct lfsck_thread_info *info          = lfsck_env_info(env);
3028         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
3029         struct lu_fid            *pfid          = &info->lti_fid2;
3030         struct lfsck_namespace   *ns            = com->lc_file_ram;
3031         struct lfsck_instance    *lfsck         = com->lc_lfsck;
3032         struct lustre_handle      lh            = { 0 };
3033         struct linkea_data        ldata         = { NULL };
3034         bool                      unknown       = false;
3035         bool                      lpf           = false;
3036         bool                      retry         = false;
3037         enum lfsck_namespace_inconsistency_type type = LNIT_BAD_LINKEA;
3038         int                       rc            = 0;
3039         ENTRY;
3040
3041         LASSERT(!dt_object_remote(child));
3042
3043         if (flags & LNTF_UNCERTAIN_LMV) {
3044                 if (flags & LNTF_RECHECK_NAME_HASH) {
3045                         rc = lfsck_namespace_scan_shard(env, com, child);
3046                         if (rc < 0)
3047                                 RETURN(rc);
3048
3049                         ns->ln_striped_shards_scanned++;
3050                 } else {
3051                         ns->ln_striped_shards_skipped++;
3052                 }
3053         }
3054
3055         flags &= ~(LNTF_RECHECK_NAME_HASH | LNTF_UNCERTAIN_LMV);
3056         if (flags == 0)
3057                 RETURN(0);
3058
3059         if (flags & (LNTF_CHECK_LINKEA | LNTF_CHECK_PARENT) &&
3060             !(lfsck->li_bookmark_ram.lb_param & LPF_ALL_TGT)) {
3061                 CDEBUG(D_LFSCK, "%s: some MDT(s) maybe NOT take part in the"
3062                        "the namespace LFSCK, then the LFSCK cannot guarantee"
3063                        "all the name entries have been verified in first-stage"
3064                        "scanning. So have to skip orphan related handling for"
3065                        "the directory object "DFID" with remote name entry\n",
3066                        lfsck_lfsck2name(lfsck), PFID(cfid));
3067
3068                 RETURN(0);
3069         }
3070
3071         if (unlikely(!dt_try_as_dir(env, child)))
3072                 GOTO(out, rc = -ENOTDIR);
3073
3074         /* We only take ldlm lock on the @child when required. When the
3075          * logic comes here for the first time, it is always false. */
3076         if (0) {
3077
3078 lock:
3079                 rc = lfsck_ibits_lock(env, lfsck, child, &lh,
3080                                       MDS_INODELOCK_UPDATE |
3081                                       MDS_INODELOCK_XATTR, LCK_EX);
3082                 if (rc != 0)
3083                         GOTO(out, rc);
3084         }
3085
3086         dt_read_lock(env, child, 0);
3087         if (unlikely(lfsck_is_dead_obj(child))) {
3088                 dt_read_unlock(env, child);
3089
3090                 GOTO(out, rc = 0);
3091         }
3092
3093         rc = dt_lookup(env, child, (struct dt_rec *)pfid,
3094                        (const struct dt_key *)dotdot);
3095         if (rc != 0) {
3096                 if (rc != -ENOENT && rc != -ENODATA && rc != -EINVAL) {
3097                         dt_read_unlock(env, child);
3098
3099                         GOTO(out, rc);
3100                 }
3101
3102                 if (!lustre_handle_is_used(&lh)) {
3103                         dt_read_unlock(env, child);
3104                         goto lock;
3105                 }
3106
3107                 fid_zero(pfid);
3108         } else if (lfsck->li_lpf_obj != NULL &&
3109                    lu_fid_eq(pfid, lfsck_dto2fid(lfsck->li_lpf_obj))) {
3110                 lpf = true;
3111         } else if (unlikely(!fid_is_sane(pfid))) {
3112                 fid_zero(pfid);
3113         }
3114
3115         rc = lfsck_links_read(env, child, &ldata);
3116         dt_read_unlock(env, child);
3117         if (rc != 0) {
3118                 if (rc != -ENODATA && rc != -EINVAL)
3119                         GOTO(out, rc);
3120
3121                 if (!lustre_handle_is_used(&lh))
3122                         goto lock;
3123
3124                 if (rc == -EINVAL && !fid_is_zero(pfid)) {
3125                         /* Remove the corrupted linkEA. */
3126                         rc = lfsck_namespace_links_remove(env, com, child);
3127                         if (rc == 0)
3128                                 /* Here, because of the crashed linkEA, we
3129                                  * cannot know whether there is some parent
3130                                  * that references the child directory via
3131                                  * some name entry or not. So keep it there,
3132                                  * when the LFSCK run next time, if there is
3133                                  * some parent that references this object,
3134                                  * then the LFSCK can rebuild the linkEA;
3135                                  * otherwise, this object will be handled
3136                                  * as orphan as above. */
3137                                 unknown = true;
3138                 } else {
3139                         /* 1. If we have neither ".." nor linkEA,
3140                          *    then it is an orphan.
3141                          *
3142                          * 2. If we only have the ".." name entry,
3143                          *    but no parent references this child
3144                          *    directory, then handle it as orphan. */
3145                         lfsck_ibits_unlock(&lh, LCK_EX);
3146                         type = LNIT_MUL_REF;
3147
3148                         /* If the LFSCK is marked as LF_INCOMPLETE,
3149                          * then means some MDT has ever tried to
3150                          * verify some remote MDT-object that resides
3151                          * on this MDT, but this MDT failed to respond
3152                          * such request. So means there may be some
3153                          * remote name entry on other MDT that
3154                          * references this object with another name,
3155                          * so we cannot know whether this linkEA is
3156                          * valid or not. So keep it there and maybe
3157                          * resolved when next LFSCK run. */
3158                         if (ns->ln_flags & LF_INCOMPLETE)
3159                                 GOTO(out, rc = 0);
3160
3161                         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
3162                                  "-"DFID, PFID(pfid));
3163                         rc = lfsck_namespace_insert_orphan(env, com, child,
3164                                                 info->lti_tmpbuf, "D", NULL);
3165                 }
3166
3167                 GOTO(out, rc);
3168         }
3169
3170         linkea_first_entry(&ldata);
3171         /* This is the most common case: the object has unique linkEA entry. */
3172         if (ldata.ld_leh->leh_reccount == 1) {
3173                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, &ldata,
3174                                                 &lh, &type, &retry);
3175                 if (retry) {
3176                         LASSERT(!lustre_handle_is_used(&lh));
3177
3178                         retry = false;
3179                         goto lock;
3180                 }
3181
3182                 GOTO(out, rc);
3183         }
3184
3185         if (!lustre_handle_is_used(&lh))
3186                 goto lock;
3187
3188         if (unlikely(ldata.ld_leh->leh_reccount == 0)) {
3189                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, &lh,
3190                                                 &type);
3191
3192                 GOTO(out, rc);
3193         }
3194
3195         /* When we come here, the cases usually like that:
3196          * 1) The directory object has a corrupted linkEA entry. During the
3197          *    first-stage scanning, the LFSCK cannot know such corruption,
3198          *    then it appends the right linkEA entry according to the found
3199          *    name entry after the bad one.
3200          *
3201          * 2) The directory object has a right linkEA entry. During the
3202          *    first-stage scanning, the LFSCK finds some bad name entry,
3203          *    but the LFSCK cannot aware that at that time, then it adds
3204          *    the bad linkEA entry for further processing. */
3205         rc = lfsck_namespace_dsd_multiple(env, com, child, pfid, &ldata,
3206                                           &lh, &type, lpf);
3207
3208         GOTO(out, rc);
3209
3210 out:
3211         lfsck_ibits_unlock(&lh, LCK_EX);
3212         if (rc > 0) {
3213                 switch (type) {
3214                 case LNIT_BAD_LINKEA:
3215                         ns->ln_linkea_repaired++;
3216                         break;
3217                 case LNIT_UNMATCHED_PAIRS:
3218                         ns->ln_unmatched_pairs_repaired++;
3219                         break;
3220                 case LNIT_MUL_REF:
3221                         ns->ln_mul_ref_repaired++;
3222                         break;
3223                 default:
3224                         break;
3225                 }
3226         }
3227
3228         if (unknown)
3229                 ns->ln_unknown_inconsistency++;
3230
3231         return rc;
3232 }
3233
3234 /**
3235  * Double scan the MDT-object for namespace LFSCK.
3236  *
3237  * If the MDT-object contains invalid or repeated linkEA entries, then drop
3238  * those entries from the linkEA; if the linkEA becomes empty or the object
3239  * has no linkEA, then it is an orphan and will be added into the directory
3240  * .lustre/lost+found/MDTxxxx/; if the remote parent is lost, then recreate
3241  * the remote parent; if the name entry corresponding to some linkEA entry
3242  * is lost, then add the name entry back to the namespace.
3243  *
3244  * \param[in] env       pointer to the thread context
3245  * \param[in] com       pointer to the lfsck component
3246  * \param[in] child     pointer to the dt_object to be handled
3247  * \param[in] flags     some hints to indicate how the @child should be handled
3248  *
3249  * \retval              positive number for repaired cases
3250  * \retval              0 if nothing to be repaired
3251  * \retval              negative error number on failure
3252  */
3253 static int lfsck_namespace_double_scan_one(const struct lu_env *env,
3254                                            struct lfsck_component *com,
3255                                            struct dt_object *child, __u8 flags)
3256 {
3257         struct lfsck_thread_info *info     = lfsck_env_info(env);
3258         struct lu_attr           *la       = &info->lti_la;
3259         struct lu_name           *cname    = &info->lti_name;
3260         struct lu_fid            *pfid     = &info->lti_fid;
3261         struct lu_fid            *cfid     = &info->lti_fid2;
3262         struct lfsck_instance    *lfsck    = com->lc_lfsck;
3263         struct lfsck_namespace   *ns       = com->lc_file_ram;
3264         struct dt_object         *parent   = NULL;
3265         struct linkea_data        ldata    = { NULL };
3266         bool                      repaired = false;
3267         int                       count    = 0;
3268         int                       rc;
3269         ENTRY;
3270
3271         dt_read_lock(env, child, 0);
3272         if (unlikely(lfsck_is_dead_obj(child))) {
3273                 dt_read_unlock(env, child);
3274
3275                 RETURN(0);
3276         }
3277
3278         if (S_ISDIR(lfsck_object_type(child))) {
3279                 dt_read_unlock(env, child);
3280                 rc = lfsck_namespace_double_scan_dir(env, com, child, flags);
3281
3282                 RETURN(rc);
3283         }
3284
3285         rc = lfsck_links_read(env, child, &ldata);
3286         dt_read_unlock(env, child);
3287         if (rc != 0)
3288                 GOTO(out, rc);
3289
3290         linkea_first_entry(&ldata);
3291         while (ldata.ld_lee != NULL) {
3292                 lfsck_namespace_unpack_linkea_entry(&ldata, cname, pfid,
3293                                                     info->lti_key);
3294                 rc = lfsck_namespace_filter_linkea_entry(&ldata, cname, pfid,
3295                                                          false);
3296                 /* Found repeated linkEA entries */
3297                 if (rc > 0) {
3298                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3299                                                 &ldata, cname, pfid, false);
3300                         if (rc < 0)
3301                                 GOTO(out, rc);
3302
3303                         if (rc == 0)
3304                                 continue;
3305
3306                         repaired = true;
3307
3308                         /* fall through */
3309                 }
3310
3311                 /* Invalid PFID in the linkEA entry. */
3312                 if (!fid_is_sane(pfid)) {
3313                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3314                                                 &ldata, cname, pfid, true);
3315                         if (rc < 0)
3316                                 GOTO(out, rc);
3317
3318                         if (rc > 0)
3319                                 repaired = true;
3320
3321                         continue;
3322                 }
3323
3324                 parent = lfsck_object_find_bottom(env, lfsck, pfid);
3325                 if (IS_ERR(parent))
3326                         GOTO(out, rc = PTR_ERR(parent));
3327
3328                 if (!dt_object_exists(parent)) {
3329
3330 lost_parent:
3331                         if (ldata.ld_leh->leh_reccount > 1) {
3332                                 /* If it is NOT the last linkEA entry, then
3333                                  * there is still other chance to make the
3334                                  * child to be visible via other parent, then
3335                                  * remove this linkEA entry. */
3336                                 rc = lfsck_namespace_shrink_linkea(env, com,
3337                                         child, &ldata, cname, pfid, true);
3338                         } else {
3339                                 /* If the LFSCK is marked as LF_INCOMPLETE,
3340                                  * then means some MDT has ever tried to
3341                                  * verify some remote MDT-object that resides
3342                                  * on this MDT, but this MDT failed to respond
3343                                  * such request. So means there may be some
3344                                  * remote name entry on other MDT that
3345                                  * references this object with another name,
3346                                  * so we cannot know whether this linkEA is
3347                                  * valid or not. So keep it there and maybe
3348                                  * resolved when next LFSCK run. */
3349                                 if (ns->ln_flags & LF_INCOMPLETE) {
3350                                         lfsck_object_put(env, parent);
3351
3352                                         GOTO(out, rc = 0);
3353                                 }
3354
3355                                 /* Create the lost parent as an orphan. */
3356                                 rc = lfsck_namespace_create_orphan_dir(env, com,
3357                                                                 parent, NULL);
3358                                 if (rc < 0) {
3359                                         lfsck_object_put(env, parent);
3360
3361                                         GOTO(out, rc);
3362                                 }
3363
3364                                 if (rc > 0)
3365                                         repaired = true;
3366
3367                                 /* Add the missing name entry to the parent. */
3368                                 rc = lfsck_namespace_insert_normal(env, com,
3369                                                 parent, child, cname->ln_name);
3370                                 if (unlikely(rc == -EEXIST))
3371                                         /* Unfortunately, someone reused the
3372                                          * name under the parent by race. So we
3373                                          * have to remove the linkEA entry from
3374                                          * current child object. It means that
3375                                          * the LFSCK cannot recover the system
3376                                          * totally back to its original status,
3377                                          * but it is necessary to make the
3378                                          * current system to be consistent. */
3379                                         rc = lfsck_namespace_shrink_linkea(env,
3380                                                         com, child, &ldata,
3381                                                         cname, pfid, true);
3382                                 else
3383                                         linkea_next_entry(&ldata);
3384                         }
3385
3386                         lfsck_object_put(env, parent);
3387                         if (rc < 0)
3388                                 GOTO(out, rc);
3389
3390                         if (rc > 0)
3391                                 repaired = true;
3392
3393                         continue;
3394                 }
3395
3396                 /* The linkEA entry with bad parent will be removed. */
3397                 if (unlikely(!dt_try_as_dir(env, parent))) {
3398                         lfsck_object_put(env, parent);
3399                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3400                                                 &ldata, cname, pfid, true);
3401                         if (rc < 0)
3402                                 GOTO(out, rc);
3403
3404                         if (rc > 0)
3405                                 repaired = true;
3406
3407                         continue;
3408                 }
3409
3410                 rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
3411                                (const struct dt_key *)cname->ln_name);
3412                 if (rc != 0 && rc != -ENOENT) {
3413                         lfsck_object_put(env, parent);
3414
3415                         GOTO(out, rc);
3416                 }
3417
3418                 if (rc == 0) {
3419                         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
3420                                 /* It is the most common case that we
3421                                  * find the name entry corresponding
3422                                  * to the linkEA entry. */
3423                                 lfsck_object_put(env, parent);
3424                                 linkea_next_entry(&ldata);
3425                         } else {
3426                                 /* The name entry references another
3427                                  * MDT-object that may be created by
3428                                  * the LFSCK for repairing dangling
3429                                  * name entry. Try to replace it. */
3430                                 rc = lfsck_namespace_replace_cond(env, com,
3431                                                 parent, child, cfid, cname);
3432                                 lfsck_object_put(env, parent);
3433                                 if (rc < 0)
3434                                         GOTO(out, rc);
3435
3436                                 if (rc > 0) {
3437                                         repaired = true;
3438                                         linkea_next_entry(&ldata);
3439                                 } else {
3440                                         rc = lfsck_namespace_shrink_linkea(env,
3441                                                         com, child, &ldata,
3442                                                         cname, pfid, true);
3443                                         if (rc < 0)
3444                                                 GOTO(out, rc);
3445
3446                                         if (rc > 0)
3447                                                 repaired = true;
3448                                 }
3449                         }
3450
3451                         continue;
3452                 }
3453
3454                 rc = dt_attr_get(env, child, la);
3455                 if (rc != 0)
3456                         GOTO(out, rc);
3457
3458                 /* If there is no name entry in the parent dir and the object
3459                  * link count is less than the linkea entries count, then the
3460                  * linkea entry should be removed. */
3461                 if (ldata.ld_leh->leh_reccount > la->la_nlink) {
3462                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
3463                                         parent, child, &ldata, cname, pfid);
3464                         lfsck_object_put(env, parent);
3465                         if (rc < 0)
3466                                 GOTO(out, rc);
3467
3468                         if (rc > 0)
3469                                 repaired = true;
3470
3471                         continue;
3472                 }
3473
3474                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some
3475                  * MDT has ever tried to verify some remote MDT-object that
3476                  * resides on this MDT, but this MDT failed to respond such
3477                  * request. So means there may be some remote name entry on
3478                  * other MDT that references this object with another name,
3479                  * so we cannot know whether this linkEA is valid or not.
3480                  * So keep it there and maybe resolved when next LFSCK run. */
3481                 if (ns->ln_flags & LF_INCOMPLETE) {
3482                         lfsck_object_put(env, parent);
3483
3484                         GOTO(out, rc = 0);
3485                 }
3486
3487                 rc = lfsck_namespace_check_name(env, parent, child, cname);
3488                 if (rc == -ENOENT)
3489                         goto lost_parent;
3490
3491                 if (rc < 0) {
3492                         lfsck_object_put(env, parent);
3493
3494                         GOTO(out, rc);
3495                 }
3496
3497                 /* It is an invalid name entry, drop it. */
3498                 if (unlikely(rc > 0)) {
3499                         lfsck_object_put(env, parent);
3500                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3501                                                 &ldata, cname, pfid, true);
3502                         if (rc < 0)
3503                                 GOTO(out, rc);
3504
3505                         if (rc > 0)
3506                                 repaired = true;
3507
3508                         continue;
3509                 }
3510
3511                 /* Add the missing name entry back to the namespace. */
3512                 rc = lfsck_namespace_insert_normal(env, com, parent, child,
3513                                                    cname->ln_name);
3514                 if (unlikely(rc == -ESTALE))
3515                         /* It may happen when the remote object has been
3516                          * removed, but the local MDT is not aware of that. */
3517                         goto lost_parent;
3518
3519                 if (unlikely(rc == -EEXIST))
3520                         /* Unfortunately, someone reused the name under the
3521                          * parent by race. So we have to remove the linkEA
3522                          * entry from current child object. It means that the
3523                          * LFSCK cannot recover the system totally back to
3524                          * its original status, but it is necessary to make
3525                          * the current system to be consistent.
3526                          *
3527                          * It also may be because of the LFSCK found some
3528                          * internal status of create operation. Under such
3529                          * case, nothing to be done. */
3530                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
3531                                         parent, child, &ldata, cname, pfid);
3532                 else
3533                         linkea_next_entry(&ldata);
3534
3535                 lfsck_object_put(env, parent);
3536                 if (rc < 0)
3537                         GOTO(out, rc);
3538
3539                 if (rc > 0)
3540                         repaired = true;
3541         }
3542
3543         GOTO(out, rc = 0);
3544
3545 out:
3546         if (rc < 0 && rc != -ENODATA)
3547                 return rc;
3548
3549         if (rc == 0) {
3550                 LASSERT(ldata.ld_leh != NULL);
3551
3552                 count = ldata.ld_leh->leh_reccount;
3553         }
3554
3555         if (count == 0) {
3556                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some
3557                  * MDT has ever tried to verify some remote MDT-object that
3558                  * resides on this MDT, but this MDT failed to respond such
3559                  * request. So means there may be some remote name entry on
3560                  * other MDT that references this object with another name,
3561                  * so we cannot know whether this linkEA is valid or not.
3562                  * So keep it there and maybe resolved when next LFSCK run. */
3563                 if (!(ns->ln_flags & LF_INCOMPLETE)) {
3564                         /* If the child becomes orphan, then insert it into
3565                          * the global .lustre/lost+found/MDTxxxx directory. */
3566                         rc = lfsck_namespace_insert_orphan(env, com, child,
3567                                                            "", "O", &count);
3568                         if (rc < 0)
3569                                 return rc;
3570
3571                         if (rc > 0) {
3572                                 ns->ln_mul_ref_repaired++;
3573                                 repaired = true;
3574                         }
3575                 }
3576         } else {
3577                 rc = dt_attr_get(env, child, la);
3578                 if (rc != 0)
3579                         return rc;
3580
3581                 if (la->la_nlink != 0 && la->la_nlink != count) {
3582                         rc = lfsck_namespace_repair_nlink(env, com, child, la);
3583                         if (rc > 0) {
3584                                 ns->ln_objs_nlink_repaired++;
3585                                 rc = 0;
3586                         }
3587                 }
3588         }
3589
3590         if (repaired) {
3591                 if (la->la_nlink > 1)
3592                         ns->ln_mul_linked_repaired++;
3593
3594                 if (rc == 0)
3595                         rc = 1;
3596         }
3597
3598         return rc;
3599 }
3600
3601 static void lfsck_namespace_dump_statistics(struct seq_file *m,
3602                                             struct lfsck_namespace *ns,
3603                                             __u64 checked_phase1,
3604                                             __u64 checked_phase2,
3605                                             __u32 time_phase1,
3606                                             __u32 time_phase2)
3607 {
3608         seq_printf(m, "checked_phase1: "LPU64"\n"
3609                       "checked_phase2: "LPU64"\n"
3610                       "updated_phase1: "LPU64"\n"
3611                       "updated_phase2: "LPU64"\n"
3612                       "failed_phase1: "LPU64"\n"
3613                       "failed_phase2: "LPU64"\n"
3614                       "directories: "LPU64"\n"
3615                       "dirent_repaired: "LPU64"\n"
3616                       "linkea_repaired: "LPU64"\n"
3617                       "nlinks_repaired: "LPU64"\n"
3618                       "multiple_linked_checked: "LPU64"\n"
3619                       "multiple_linked_repaired: "LPU64"\n"
3620                       "unknown_inconsistency: "LPU64"\n"
3621                       "unmatched_pairs_repaired: "LPU64"\n"
3622                       "dangling_repaired: "LPU64"\n"
3623                       "multiple_referenced_repaired: "LPU64"\n"
3624                       "bad_file_type_repaired: "LPU64"\n"
3625                       "lost_dirent_repaired: "LPU64"\n"
3626                       "local_lost_found_scanned: "LPU64"\n"
3627                       "local_lost_found_moved: "LPU64"\n"
3628                       "local_lost_found_skipped: "LPU64"\n"
3629                       "local_lost_found_failed: "LPU64"\n"
3630                       "striped_dirs_scanned: "LPU64"\n"
3631                       "striped_dirs_repaired: "LPU64"\n"
3632                       "striped_dirs_failed: "LPU64"\n"
3633                       "striped_dirs_disabled: "LPU64"\n"
3634                       "striped_dirs_skipped: "LPU64"\n"
3635                       "striped_shards_scanned: "LPU64"\n"
3636                       "striped_shards_repaired: "LPU64"\n"
3637                       "striped_shards_failed: "LPU64"\n"
3638                       "striped_shards_skipped: "LPU64"\n"
3639                       "name_hash_repaired: "LPU64"\n"
3640                       "success_count: %u\n"
3641                       "run_time_phase1: %u seconds\n"
3642                       "run_time_phase2: %u seconds\n",
3643                       checked_phase1,
3644                       checked_phase2,
3645                       ns->ln_items_repaired,
3646                       ns->ln_objs_repaired_phase2,
3647                       ns->ln_items_failed,
3648                       ns->ln_objs_failed_phase2,
3649                       ns->ln_dirs_checked,
3650                       ns->ln_dirent_repaired,
3651                       ns->ln_linkea_repaired,
3652                       ns->ln_objs_nlink_repaired,
3653                       ns->ln_mul_linked_checked,
3654                       ns->ln_mul_linked_repaired,
3655                       ns->ln_unknown_inconsistency,
3656                       ns->ln_unmatched_pairs_repaired,
3657                       ns->ln_dangling_repaired,
3658                       ns->ln_mul_ref_repaired,
3659                       ns->ln_bad_type_repaired,
3660                       ns->ln_lost_dirent_repaired,
3661                       ns->ln_local_lpf_scanned,
3662                       ns->ln_local_lpf_moved,
3663                       ns->ln_local_lpf_skipped,
3664                       ns->ln_local_lpf_failed,
3665                       ns->ln_striped_dirs_scanned,
3666                       ns->ln_striped_dirs_repaired,
3667                       ns->ln_striped_dirs_failed,
3668                       ns->ln_striped_dirs_disabled,
3669                       ns->ln_striped_dirs_skipped,
3670                       ns->ln_striped_shards_scanned,
3671                       ns->ln_striped_shards_repaired,
3672                       ns->ln_striped_shards_failed,
3673                       ns->ln_striped_shards_skipped,
3674                       ns->ln_name_hash_repaired,
3675                       ns->ln_success_count,
3676                       time_phase1,
3677                       time_phase2);
3678 }
3679
3680 static void lfsck_namespace_release_lmv(const struct lu_env *env,
3681                                         struct lfsck_component *com)
3682 {
3683         struct lfsck_instance           *lfsck  = com->lc_lfsck;
3684         struct lfsck_namespace          *ns     = com->lc_file_ram;
3685
3686         while (!list_empty(&lfsck->li_list_lmv)) {
3687                 struct lfsck_lmv_unit   *llu;
3688                 struct lfsck_lmv        *llmv;
3689
3690                 llu = list_entry(lfsck->li_list_lmv.next,
3691                                  struct lfsck_lmv_unit, llu_link);
3692                 llmv = &llu->llu_lmv;
3693
3694                 LASSERTF(atomic_read(&llmv->ll_ref) == 1,
3695                          "still in using: %u\n",
3696                          atomic_read(&llmv->ll_ref));
3697
3698                 ns->ln_striped_dirs_skipped++;
3699                 lfsck_lmv_put(env, llmv);
3700         }
3701 }
3702
3703 static int lfsck_namespace_check_for_double_scan(const struct lu_env *env,
3704                                                  struct lfsck_component *com,
3705                                                  struct dt_object *obj)
3706 {
3707         struct lu_attr *la = &lfsck_env_info(env)->lti_la;
3708         int             rc;
3709
3710         rc = dt_attr_get(env, obj, la);
3711         if (rc != 0)
3712                 return rc;
3713
3714         /* zero-linkEA object may be orphan, but it also maybe because
3715          * of upgrading. Currently, we cannot record it for double scan.
3716          * Because it may cause the LFSCK trace file to be too large. */
3717
3718         /* "la_ctime" == 1 means that it has ever been removed from
3719          * backend /lost+found directory but not been added back to
3720          * the normal namespace yet. */
3721
3722         if ((S_ISREG(lfsck_object_type(obj)) && la->la_nlink > 1) ||
3723             unlikely(la->la_ctime == 1))
3724                 rc = lfsck_namespace_trace_update(env, com, lfsck_dto2fid(obj),
3725                                                   LNTF_CHECK_LINKEA, true);
3726
3727         return rc;
3728 }
3729
3730 /* namespace APIs */
3731
3732 static int lfsck_namespace_reset(const struct lu_env *env,
3733                                  struct lfsck_component *com, bool init)
3734 {
3735         struct lfsck_instance           *lfsck  = com->lc_lfsck;
3736         struct lfsck_namespace          *ns     = com->lc_file_ram;
3737         struct lfsck_assistant_data     *lad    = com->lc_data;
3738         struct dt_object                *root;
3739         struct dt_object                *dto;
3740         int                              rc;
3741         ENTRY;
3742
3743         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
3744         if (IS_ERR(root))
3745                 GOTO(log, rc = PTR_ERR(root));
3746
3747         if (unlikely(!dt_try_as_dir(env, root)))
3748                 GOTO(put, rc = -ENOTDIR);
3749
3750         down_write(&com->lc_sem);
3751         if (init) {
3752                 memset(ns, 0, sizeof(*ns));
3753         } else {
3754                 __u32 count = ns->ln_success_count;
3755                 __u64 last_time = ns->ln_time_last_complete;
3756
3757                 memset(ns, 0, sizeof(*ns));
3758                 ns->ln_success_count = count;
3759                 ns->ln_time_last_complete = last_time;
3760         }
3761         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
3762         ns->ln_status = LS_INIT;
3763
3764         lfsck_object_put(env, com->lc_obj);
3765         com->lc_obj = NULL;
3766         dto = lfsck_namespace_load_one_trace_file(env, com, root,
3767                                                   LFSCK_NAMESPACE, true);
3768         if (IS_ERR(dto))
3769                 GOTO(out, rc = PTR_ERR(dto));
3770
3771         com->lc_obj = dto;
3772         rc = lfsck_namespace_load_sub_trace_files(env, com, true);
3773         if (rc != 0)
3774                 GOTO(out, rc);
3775
3776         lad->lad_incomplete = 0;
3777         CFS_RESET_BITMAP(lad->lad_bitmap);
3778
3779         rc = lfsck_namespace_store(env, com, true);
3780
3781         GOTO(out, rc);
3782
3783 out:
3784         up_write(&com->lc_sem);
3785
3786 put:
3787         lfsck_object_put(env, root);
3788 log:
3789         CDEBUG(D_LFSCK, "%s: namespace LFSCK reset: rc = %d\n",
3790                lfsck_lfsck2name(lfsck), rc);
3791         return rc;
3792 }
3793
3794 static void
3795 lfsck_namespace_fail(const struct lu_env *env, struct lfsck_component *com,
3796                      bool new_checked)
3797 {
3798         struct lfsck_namespace *ns = com->lc_file_ram;
3799
3800         down_write(&com->lc_sem);
3801         if (new_checked)
3802                 com->lc_new_checked++;
3803         lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
3804         up_write(&com->lc_sem);
3805 }
3806
3807 static void lfsck_namespace_close_dir(const struct lu_env *env,
3808                                       struct lfsck_component *com)
3809 {
3810         struct lfsck_namespace          *ns     = com->lc_file_ram;
3811         struct lfsck_assistant_data     *lad    = com->lc_data;
3812         struct lfsck_instance           *lfsck  = com->lc_lfsck;
3813         struct lfsck_lmv                *llmv   = lfsck->li_lmv;
3814         struct lfsck_namespace_req      *lnr;
3815         __u32                            size   =
3816                                 sizeof(*lnr) + LFSCK_TMPBUF_LEN;
3817         bool                             wakeup = false;
3818         ENTRY;
3819
3820         if (llmv == NULL)
3821                 RETURN_EXIT;
3822
3823         OBD_ALLOC(lnr, size);
3824         if (lnr == NULL) {
3825                 ns->ln_striped_dirs_skipped++;
3826
3827                 RETURN_EXIT;
3828         }
3829
3830         /* Generate a dummy request to indicate that all shards' name entry
3831          * in this striped directory has been scanned for the first time. */
3832         INIT_LIST_HEAD(&lnr->lnr_lar.lar_list);
3833         lnr->lnr_lar.lar_fid = *lfsck_dto2fid(lfsck->li_obj_dir);
3834         lnr->lnr_lmv = lfsck_lmv_get(llmv);
3835         lnr->lnr_fid = *lfsck_dto2fid(lfsck->li_obj_dir);
3836         lnr->lnr_oit_cookie = lfsck->li_pos_current.lp_oit_cookie;
3837         lnr->lnr_dir_cookie = MDS_DIR_END_OFF;
3838         lnr->lnr_size = size;
3839
3840         spin_lock(&lad->lad_lock);
3841         if (lad->lad_assistant_status < 0) {
3842                 spin_unlock(&lad->lad_lock);
3843                 lfsck_namespace_assistant_req_fini(env, &lnr->lnr_lar);
3844                 ns->ln_striped_dirs_skipped++;
3845
3846                 RETURN_EXIT;
3847         }
3848
3849         list_add_tail(&lnr->lnr_lar.lar_list, &lad->lad_req_list);
3850         if (lad->lad_prefetched == 0)
3851                 wakeup = true;
3852
3853         lad->lad_prefetched++;
3854         spin_unlock(&lad->lad_lock);
3855         if (wakeup)
3856                 wake_up_all(&lad->lad_thread.t_ctl_waitq);
3857
3858         EXIT;
3859 }
3860
3861 static int lfsck_namespace_open_dir(const struct lu_env *env,
3862                                     struct lfsck_component *com)
3863 {
3864         struct lfsck_instance   *lfsck  = com->lc_lfsck;
3865         struct lfsck_namespace  *ns     = com->lc_file_ram;
3866         struct lfsck_lmv        *llmv   = lfsck->li_lmv;
3867         int                      rc     = 0;
3868         ENTRY;
3869
3870         if (llmv == NULL)
3871                 RETURN(0);
3872
3873         if (llmv->ll_lmv_master) {
3874                 struct lmv_mds_md_v1 *lmv = &llmv->ll_lmv;
3875
3876                 if (lmv->lmv_master_mdt_index != lfsck_dev_idx(lfsck)) {
3877                         lmv->lmv_master_mdt_index =
3878                                 lfsck_dev_idx(lfsck);
3879                         ns->ln_flags |= LF_INCONSISTENT;
3880                         llmv->ll_lmv_updated = 1;
3881                 }
3882         } else {
3883                 rc = lfsck_namespace_verify_stripe_slave(env, com,
3884                                         lfsck->li_obj_dir, llmv);
3885         }
3886
3887         RETURN(rc > 0 ? 0 : rc);
3888 }
3889
3890 static int lfsck_namespace_checkpoint(const struct lu_env *env,
3891                                       struct lfsck_component *com, bool init)
3892 {
3893         struct lfsck_instance   *lfsck = com->lc_lfsck;
3894         struct lfsck_namespace  *ns    = com->lc_file_ram;
3895         int                      rc;
3896
3897         if (!init) {
3898                 rc = lfsck_checkpoint_generic(env, com);
3899                 if (rc != 0)
3900                         goto log;
3901         }
3902
3903         down_write(&com->lc_sem);
3904         if (init) {
3905                 ns->ln_pos_latest_start = lfsck->li_pos_checkpoint;
3906         } else {
3907                 ns->ln_pos_last_checkpoint = lfsck->li_pos_checkpoint;
3908                 ns->ln_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
3909                                 HALF_SEC - lfsck->li_time_last_checkpoint);
3910                 ns->ln_time_last_checkpoint = cfs_time_current_sec();
3911                 ns->ln_items_checked += com->lc_new_checked;
3912                 com->lc_new_checked = 0;
3913         }
3914
3915         rc = lfsck_namespace_store(env, com, false);
3916         up_write(&com->lc_sem);
3917
3918 log:
3919         CDEBUG(D_LFSCK, "%s: namespace LFSCK checkpoint at the pos ["LPU64
3920                ", "DFID", "LPX64"]: rc = %d\n", lfsck_lfsck2name(lfsck),
3921                lfsck->li_pos_current.lp_oit_cookie,
3922                PFID(&lfsck->li_pos_current.lp_dir_parent),
3923                lfsck->li_pos_current.lp_dir_cookie, rc);
3924
3925         return rc > 0 ? 0 : rc;
3926 }
3927
3928 static int lfsck_namespace_prep(const struct lu_env *env,
3929                                 struct lfsck_component *com,
3930                                 struct lfsck_start_param *lsp)
3931 {
3932         struct lfsck_instance   *lfsck  = com->lc_lfsck;
3933         struct lfsck_namespace  *ns     = com->lc_file_ram;
3934         struct lfsck_position   *pos    = &com->lc_pos_start;
3935         int                      rc;
3936
3937         rc = lfsck_namespace_load_bitmap(env, com);
3938         if (rc != 0 || ns->ln_status == LS_COMPLETED) {
3939                 rc = lfsck_namespace_reset(env, com, false);
3940                 if (rc == 0)
3941                         rc = lfsck_set_param(env, lfsck, lsp->lsp_start, true);
3942
3943                 if (rc != 0) {
3944                         CDEBUG(D_LFSCK, "%s: namespace LFSCK prep failed: "
3945                                "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
3946
3947                         return rc;
3948                 }
3949         }
3950
3951         down_write(&com->lc_sem);
3952         ns->ln_time_latest_start = cfs_time_current_sec();
3953         spin_lock(&lfsck->li_lock);
3954
3955         if (ns->ln_flags & LF_SCANNED_ONCE) {
3956                 if (!lfsck->li_drop_dryrun ||
3957                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
3958                         ns->ln_status = LS_SCANNING_PHASE2;
3959                         list_move_tail(&com->lc_link,
3960                                        &lfsck->li_list_double_scan);
3961                         if (!list_empty(&com->lc_link_dir))
3962                                 list_del_init(&com->lc_link_dir);
3963                         lfsck_pos_set_zero(pos);
3964                 } else {
3965                         ns->ln_status = LS_SCANNING_PHASE1;
3966                         ns->ln_run_time_phase1 = 0;
3967                         ns->ln_run_time_phase2 = 0;
3968                         ns->ln_items_checked = 0;
3969                         ns->ln_items_repaired = 0;
3970                         ns->ln_items_failed = 0;
3971                         ns->ln_dirs_checked = 0;
3972                         ns->ln_objs_checked_phase2 = 0;
3973                         ns->ln_objs_repaired_phase2 = 0;
3974                         ns->ln_objs_failed_phase2 = 0;
3975                         ns->ln_objs_nlink_repaired = 0;
3976                         ns->ln_dirent_repaired = 0;
3977                         ns->ln_linkea_repaired = 0;
3978                         ns->ln_mul_linked_checked = 0;
3979                         ns->ln_mul_linked_repaired = 0;
3980                         ns->ln_unknown_inconsistency = 0;
3981                         ns->ln_unmatched_pairs_repaired = 0;
3982                         ns->ln_dangling_repaired = 0;
3983                         ns->ln_mul_ref_repaired = 0;
3984                         ns->ln_bad_type_repaired = 0;
3985                         ns->ln_lost_dirent_repaired = 0;
3986                         ns->ln_striped_dirs_scanned = 0;
3987                         ns->ln_striped_dirs_repaired = 0;
3988                         ns->ln_striped_dirs_failed = 0;
3989                         ns->ln_striped_dirs_disabled = 0;
3990                         ns->ln_striped_dirs_skipped = 0;
3991                         ns->ln_striped_shards_scanned = 0;
3992                         ns->ln_striped_shards_repaired = 0;
3993                         ns->ln_striped_shards_failed = 0;
3994                         ns->ln_striped_shards_skipped = 0;
3995                         ns->ln_name_hash_repaired = 0;
3996                         fid_zero(&ns->ln_fid_latest_scanned_phase2);
3997                         if (list_empty(&com->lc_link_dir))
3998                                 list_add_tail(&com->lc_link_dir,
3999                                               &lfsck->li_list_dir);
4000                         *pos = ns->ln_pos_first_inconsistent;
4001                 }
4002         } else {
4003                 ns->ln_status = LS_SCANNING_PHASE1;
4004                 if (list_empty(&com->lc_link_dir))
4005                         list_add_tail(&com->lc_link_dir,
4006                                       &lfsck->li_list_dir);
4007                 if (!lfsck->li_drop_dryrun ||
4008                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
4009                         *pos = ns->ln_pos_last_checkpoint;
4010                         pos->lp_oit_cookie++;
4011                 } else {
4012                         *pos = ns->ln_pos_first_inconsistent;
4013                 }
4014         }
4015
4016         spin_unlock(&lfsck->li_lock);
4017         up_write(&com->lc_sem);
4018
4019         rc = lfsck_start_assistant(env, com, lsp);
4020
4021         CDEBUG(D_LFSCK, "%s: namespace LFSCK prep done, start pos ["LPU64", "
4022                DFID", "LPX64"]: rc = %d\n",
4023                lfsck_lfsck2name(lfsck), pos->lp_oit_cookie,
4024                PFID(&pos->lp_dir_parent), pos->lp_dir_cookie, rc);
4025
4026         return rc;
4027 }
4028
4029 static int lfsck_namespace_exec_oit(const struct lu_env *env,
4030                                     struct lfsck_component *com,
4031                                     struct dt_object *obj)
4032 {
4033         struct lfsck_thread_info *info  = lfsck_env_info(env);
4034         struct lfsck_namespace   *ns    = com->lc_file_ram;
4035         struct lfsck_instance    *lfsck = com->lc_lfsck;
4036         const struct lu_fid      *fid   = lfsck_dto2fid(obj);
4037         struct lu_fid            *pfid  = &info->lti_fid2;
4038         struct lu_name           *cname = &info->lti_name;
4039         struct lu_seq_range      *range = &info->lti_range;
4040         struct seq_server_site   *ss    = lfsck_dev_site(lfsck);
4041         struct linkea_data        ldata = { NULL };
4042         __u32                     idx   = lfsck_dev_idx(lfsck);
4043         int                       rc;
4044         ENTRY;
4045
4046         rc = lfsck_links_read(env, obj, &ldata);
4047         if (rc == -ENOENT)
4048                 GOTO(out, rc = 0);
4049
4050         /* -EINVAL means crashed linkEA, should be verified. */
4051         if (rc == -EINVAL) {
4052                 rc = lfsck_namespace_trace_update(env, com, fid,
4053                                                   LNTF_CHECK_LINKEA, true);
4054                 if (rc == 0) {
4055                         struct lustre_handle lh = { 0 };
4056
4057                         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
4058                                               MDS_INODELOCK_UPDATE |
4059                                               MDS_INODELOCK_XATTR, LCK_EX);
4060                         if (rc == 0) {
4061                                 rc = lfsck_namespace_links_remove(env, com,
4062                                                                   obj);
4063                                 lfsck_ibits_unlock(&lh, LCK_EX);
4064                         }
4065                 }
4066
4067                 GOTO(out, rc = (rc == -ENOENT ? 0 : rc));
4068         }
4069
4070         if (rc == -ENODATA) {
4071                 rc = lfsck_namespace_check_for_double_scan(env, com, obj);
4072
4073                 GOTO(out, rc);
4074         }
4075
4076         if (rc != 0)
4077                 GOTO(out, rc);
4078
4079         /* Record multiple-linked object. */
4080         if (ldata.ld_leh->leh_reccount > 1) {
4081                 rc = lfsck_namespace_trace_update(env, com, fid,
4082                                                   LNTF_CHECK_LINKEA, true);
4083
4084                 GOTO(out, rc);
4085         }
4086
4087         linkea_first_entry(&ldata);
4088         linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen, cname, pfid);
4089         if (!fid_is_sane(pfid)) {
4090                 rc = lfsck_namespace_trace_update(env, com, fid,
4091                                                   LNTF_CHECK_PARENT, true);
4092         } else {
4093                 fld_range_set_mdt(range);
4094                 rc = fld_local_lookup(env, ss->ss_server_fld,
4095                                       fid_seq(pfid), range);
4096                 if ((rc == -ENOENT) ||
4097                     (rc == 0 && range->lsr_index != idx))
4098                         rc = lfsck_namespace_trace_update(env, com, fid,
4099                                                 LNTF_CHECK_LINKEA, true);
4100                 else
4101                         rc = lfsck_namespace_check_for_double_scan(env, com,
4102                                                                    obj);
4103         }
4104
4105         GOTO(out, rc);
4106
4107 out:
4108         down_write(&com->lc_sem);
4109         if (S_ISDIR(lfsck_object_type(obj)))
4110                 ns->ln_dirs_checked++;
4111         if (rc != 0)
4112                 lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
4113         up_write(&com->lc_sem);
4114
4115         return rc;
4116 }
4117
4118 static int lfsck_namespace_exec_dir(const struct lu_env *env,
4119                                     struct lfsck_component *com,
4120                                     struct lu_dirent *ent, __u16 type)
4121 {
4122         struct lfsck_assistant_data     *lad     = com->lc_data;
4123         struct lfsck_instance           *lfsck   = com->lc_lfsck;
4124         struct lfsck_namespace_req      *lnr;
4125         struct lfsck_bookmark           *bk      = &lfsck->li_bookmark_ram;
4126         struct ptlrpc_thread            *mthread = &lfsck->li_thread;
4127         struct ptlrpc_thread            *athread = &lad->lad_thread;
4128         struct l_wait_info               lwi     = { 0 };
4129         bool                             wakeup  = false;
4130
4131         l_wait_event(mthread->t_ctl_waitq,
4132                      lad->lad_prefetched < bk->lb_async_windows ||
4133                      !thread_is_running(mthread) ||
4134                      thread_is_stopped(athread),
4135                      &lwi);
4136
4137         if (unlikely(!thread_is_running(mthread)) ||
4138                      thread_is_stopped(athread))
4139                 return 0;
4140
4141         if (unlikely(lfsck_is_dead_obj(lfsck->li_obj_dir)))
4142                 return 0;
4143
4144         lnr = lfsck_namespace_assistant_req_init(com->lc_lfsck, ent, type);
4145         if (IS_ERR(lnr)) {
4146                 struct lfsck_namespace *ns = com->lc_file_ram;
4147
4148                 lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
4149                 return PTR_ERR(lnr);
4150         }
4151
4152         spin_lock(&lad->lad_lock);
4153         if (lad->lad_assistant_status < 0) {
4154                 spin_unlock(&lad->lad_lock);
4155                 lfsck_namespace_assistant_req_fini(env, &lnr->lnr_lar);
4156                 return lad->lad_assistant_status;
4157         }
4158
4159         list_add_tail(&lnr->lnr_lar.lar_list, &lad->lad_req_list);
4160         if (lad->lad_prefetched == 0)
4161                 wakeup = true;
4162
4163         lad->lad_prefetched++;
4164         spin_unlock(&lad->lad_lock);
4165         if (wakeup)
4166                 wake_up_all(&lad->lad_thread.t_ctl_waitq);
4167
4168         down_write(&com->lc_sem);
4169         com->lc_new_checked++;
4170         up_write(&com->lc_sem);
4171
4172         return 0;
4173 }
4174
4175 static int lfsck_namespace_post(const struct lu_env *env,
4176                                 struct lfsck_component *com,
4177                                 int result, bool init)
4178 {
4179         struct lfsck_instance   *lfsck = com->lc_lfsck;
4180         struct lfsck_namespace  *ns    = com->lc_file_ram;
4181         int                      rc;
4182         ENTRY;
4183
4184         lfsck_post_generic(env, com, &result);
4185
4186         down_write(&com->lc_sem);
4187         lfsck_namespace_release_lmv(env, com);
4188
4189         spin_lock(&lfsck->li_lock);
4190         if (!init)
4191                 ns->ln_pos_last_checkpoint = lfsck->li_pos_checkpoint;
4192         if (result > 0) {
4193                 ns->ln_status = LS_SCANNING_PHASE2;
4194                 ns->ln_flags |= LF_SCANNED_ONCE;
4195                 ns->ln_flags &= ~LF_UPGRADE;
4196                 list_del_init(&com->lc_link_dir);
4197                 list_move_tail(&com->lc_link, &lfsck->li_list_double_scan);
4198         } else if (result == 0) {
4199                 if (lfsck->li_status != 0)
4200                         ns->ln_status = lfsck->li_status;
4201                 else
4202                         ns->ln_status = LS_STOPPED;
4203                 if (ns->ln_status != LS_PAUSED) {
4204                         list_del_init(&com->lc_link_dir);
4205                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4206                 }
4207         } else {
4208                 ns->ln_status = LS_FAILED;
4209                 list_del_init(&com->lc_link_dir);
4210                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4211         }
4212         spin_unlock(&lfsck->li_lock);
4213
4214         if (!init) {
4215                 ns->ln_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
4216                                 HALF_SEC - lfsck->li_time_last_checkpoint);
4217                 ns->ln_time_last_checkpoint = cfs_time_current_sec();
4218                 ns->ln_items_checked += com->lc_new_checked;
4219                 com->lc_new_checked = 0;
4220         }
4221
4222         rc = lfsck_namespace_store(env, com, false);
4223         up_write(&com->lc_sem);
4224
4225         CDEBUG(D_LFSCK, "%s: namespace LFSCK post done: rc = %d\n",
4226                lfsck_lfsck2name(lfsck), rc);
4227
4228         RETURN(rc);
4229 }
4230
4231 static int
4232 lfsck_namespace_dump(const struct lu_env *env, struct lfsck_component *com,
4233                      struct seq_file *m)
4234 {
4235         struct lfsck_instance   *lfsck = com->lc_lfsck;
4236         struct lfsck_bookmark   *bk    = &lfsck->li_bookmark_ram;
4237         struct lfsck_namespace  *ns    = com->lc_file_ram;
4238         int                      rc;
4239
4240         down_read(&com->lc_sem);
4241         seq_printf(m, "name: lfsck_namespace\n"
4242                    "magic: %#x\n"
4243                    "version: %d\n"
4244                    "status: %s\n",
4245                    ns->ln_magic,
4246                    bk->lb_version,
4247                    lfsck_status2names(ns->ln_status));
4248
4249         rc = lfsck_bits_dump(m, ns->ln_flags, lfsck_flags_names, "flags");
4250         if (rc < 0)
4251                 goto out;
4252
4253         rc = lfsck_bits_dump(m, bk->lb_param, lfsck_param_names, "param");
4254         if (rc < 0)
4255                 goto out;
4256
4257         rc = lfsck_time_dump(m, ns->ln_time_last_complete,
4258                              "last_completed");
4259         if (rc < 0)
4260                 goto out;
4261
4262         rc = lfsck_time_dump(m, ns->ln_time_latest_start,
4263                              "latest_start");
4264         if (rc < 0)
4265                 goto out;
4266
4267         rc = lfsck_time_dump(m, ns->ln_time_last_checkpoint,
4268                              "last_checkpoint");
4269         if (rc < 0)
4270                 goto out;
4271
4272         rc = lfsck_pos_dump(m, &ns->ln_pos_latest_start,
4273                             "latest_start_position");
4274         if (rc < 0)
4275                 goto out;
4276
4277         rc = lfsck_pos_dump(m, &ns->ln_pos_last_checkpoint,
4278                             "last_checkpoint_position");
4279         if (rc < 0)
4280                 goto out;
4281
4282         rc = lfsck_pos_dump(m, &ns->ln_pos_first_inconsistent,
4283                             "first_failure_position");
4284         if (rc < 0)
4285                 goto out;
4286
4287         if (ns->ln_status == LS_SCANNING_PHASE1) {
4288                 struct lfsck_position pos;
4289                 const struct dt_it_ops *iops;
4290                 cfs_duration_t duration = cfs_time_current() -
4291                                           lfsck->li_time_last_checkpoint;
4292                 __u64 checked = ns->ln_items_checked + com->lc_new_checked;
4293                 __u64 speed = checked;
4294                 __u64 new_checked = com->lc_new_checked *
4295                                     msecs_to_jiffies(MSEC_PER_SEC);
4296                 __u32 rtime = ns->ln_run_time_phase1 +
4297                               cfs_duration_sec(duration + HALF_SEC);
4298
4299                 if (duration != 0)
4300                         do_div(new_checked, duration);
4301
4302                 if (rtime != 0)
4303                         do_div(speed, rtime);
4304
4305                 lfsck_namespace_dump_statistics(m, ns, checked, 0, rtime, 0);
4306                 seq_printf(m, "average_speed_phase1: "LPU64" items/sec\n"
4307                               "average_speed_phase2: N/A\n"
4308                               "average_speed_total: "LPU64" items/sec\n"
4309                               "real_time_speed_phase1: "LPU64" items/sec\n"
4310                               "real_time_speed_phase2: N/A\n",
4311                               speed,
4312                               speed,
4313                               new_checked);
4314
4315                 LASSERT(lfsck->li_di_oit != NULL);
4316
4317                 iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
4318
4319                 /* The low layer otable-based iteration position may NOT
4320                  * exactly match the namespace-based directory traversal
4321                  * cookie. Generally, it is not a serious issue. But the
4322                  * caller should NOT make assumption on that. */
4323                 pos.lp_oit_cookie = iops->store(env, lfsck->li_di_oit);
4324                 if (!lfsck->li_current_oit_processed)
4325                         pos.lp_oit_cookie--;
4326
4327                 spin_lock(&lfsck->li_lock);
4328                 if (lfsck->li_di_dir != NULL) {
4329                         pos.lp_dir_cookie = lfsck->li_cookie_dir;
4330                         if (pos.lp_dir_cookie >= MDS_DIR_END_OFF) {
4331                                 fid_zero(&pos.lp_dir_parent);
4332                                 pos.lp_dir_cookie = 0;
4333                         } else {
4334                                 pos.lp_dir_parent =
4335                                         *lfsck_dto2fid(lfsck->li_obj_dir);
4336                         }
4337                 } else {
4338                         fid_zero(&pos.lp_dir_parent);
4339                         pos.lp_dir_cookie = 0;
4340                 }
4341                 spin_unlock(&lfsck->li_lock);
4342                 lfsck_pos_dump(m, &pos, "current_position");
4343         } else if (ns->ln_status == LS_SCANNING_PHASE2) {
4344                 cfs_duration_t duration = cfs_time_current() -
4345                                           lfsck->li_time_last_checkpoint;
4346                 __u64 checked = ns->ln_objs_checked_phase2 +
4347                                 com->lc_new_checked;
4348                 __u64 speed1 = ns->ln_items_checked;
4349                 __u64 speed2 = checked;
4350                 __u64 speed0 = speed1 + speed2;
4351                 __u64 new_checked = com->lc_new_checked *
4352                                     msecs_to_jiffies(MSEC_PER_SEC);
4353                 __u32 rtime = ns->ln_run_time_phase2 +
4354                               cfs_duration_sec(duration + HALF_SEC);
4355                 __u32 time0 = ns->ln_run_time_phase1 + rtime;
4356
4357                 if (duration != 0)
4358                         do_div(new_checked, duration);
4359
4360                 if (ns->ln_run_time_phase1 != 0)
4361                         do_div(speed1, ns->ln_run_time_phase1);
4362                 else if (ns->ln_items_checked != 0)
4363                         time0++;
4364
4365                 if (rtime != 0)
4366                         do_div(speed2, rtime);
4367                 else if (checked != 0)
4368                         time0++;
4369
4370                 if (time0 != 0)
4371                         do_div(speed0, time0);
4372
4373                 lfsck_namespace_dump_statistics(m, ns, ns->ln_items_checked,
4374                                                 checked,
4375                                                 ns->ln_run_time_phase1, rtime);
4376                 seq_printf(m, "average_speed_phase1: "LPU64" items/sec\n"
4377                               "average_speed_phase2: "LPU64" objs/sec\n"
4378                               "average_speed_total: "LPU64" items/sec\n"
4379                               "real_time_speed_phase1: N/A\n"
4380                               "real_time_speed_phase2: "LPU64" objs/sec\n"
4381                               "current_position: "DFID"\n",
4382                               speed1,
4383                               speed2,
4384                               speed0,
4385                               new_checked,
4386                               PFID(&ns->ln_fid_latest_scanned_phase2));
4387         } else {
4388                 __u64 speed1 = ns->ln_items_checked;
4389                 __u64 speed2 = ns->ln_objs_checked_phase2;
4390                 __u64 speed0 = speed1 + speed2;
4391                 __u32 time0 = ns->ln_run_time_phase1 + ns->ln_run_time_phase2;
4392
4393                 if (ns->ln_run_time_phase1 != 0)
4394                         do_div(speed1, ns->ln_run_time_phase1);
4395                 else if (ns->ln_items_checked != 0)
4396                         time0++;
4397
4398                 if (ns->ln_run_time_phase2 != 0)
4399                         do_div(speed2, ns->ln_run_time_phase2);
4400                 else if (ns->ln_objs_checked_phase2 != 0)
4401                         time0++;
4402
4403                 if (time0 != 0)
4404                         do_div(speed0, time0);
4405
4406                 lfsck_namespace_dump_statistics(m, ns, ns->ln_items_checked,
4407                                                 ns->ln_objs_checked_phase2,
4408                                                 ns->ln_run_time_phase1,
4409                                                 ns->ln_run_time_phase2);
4410                 seq_printf(m, "average_speed_phase1: "LPU64" items/sec\n"
4411                               "average_speed_phase2: "LPU64" objs/sec\n"
4412                               "average_speed_total: "LPU64" items/sec\n"
4413                               "real_time_speed_phase1: N/A\n"
4414                               "real_time_speed_phase2: N/A\n"
4415                               "current_position: N/A\n",
4416                               speed1,
4417                               speed2,
4418                               speed0);
4419         }
4420 out:
4421         up_read(&com->lc_sem);
4422         return 0;
4423 }
4424
4425 static int lfsck_namespace_double_scan(const struct lu_env *env,
4426                                        struct lfsck_component *com)
4427 {
4428         struct lfsck_namespace          *ns     = com->lc_file_ram;
4429         struct lfsck_assistant_data     *lad    = com->lc_data;
4430         struct lfsck_tgt_descs          *ltds   = &com->lc_lfsck->li_mdt_descs;
4431         struct lfsck_tgt_desc           *ltd;
4432         struct lfsck_tgt_desc           *next;
4433         int                              rc;
4434
4435         rc = lfsck_double_scan_generic(env, com, ns->ln_status);
4436         if (thread_is_stopped(&lad->lad_thread)) {
4437                 LASSERT(list_empty(&lad->lad_req_list));
4438                 LASSERT(list_empty(&lad->lad_mdt_phase1_list));
4439
4440                 spin_lock(&ltds->ltd_lock);
4441                 list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
4442                                          ltd_namespace_phase_list) {
4443                         list_del_init(&ltd->ltd_namespace_phase_list);
4444                 }
4445                 spin_unlock(&ltds->ltd_lock);
4446         }
4447
4448         return rc;
4449 }
4450
4451 static void lfsck_namespace_data_release(const struct lu_env *env,
4452                                          struct lfsck_component *com)
4453 {
4454         struct lfsck_assistant_data     *lad    = com->lc_data;
4455         struct lfsck_tgt_descs          *ltds   = &com->lc_lfsck->li_mdt_descs;
4456         struct lfsck_tgt_desc           *ltd;
4457         struct lfsck_tgt_desc           *next;
4458
4459         LASSERT(lad != NULL);
4460         LASSERT(thread_is_init(&lad->lad_thread) ||
4461                 thread_is_stopped(&lad->lad_thread));
4462         LASSERT(list_empty(&lad->lad_req_list));
4463
4464         com->lc_data = NULL;
4465         lfsck_namespace_release_lmv(env, com);
4466
4467         spin_lock(&ltds->ltd_lock);
4468         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase1_list,
4469                                  ltd_namespace_phase_list) {
4470                 list_del_init(&ltd->ltd_namespace_phase_list);
4471         }
4472         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
4473                                  ltd_namespace_phase_list) {
4474                 list_del_init(&ltd->ltd_namespace_phase_list);
4475         }
4476         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_list,
4477                                  ltd_namespace_list) {
4478                 list_del_init(&ltd->ltd_namespace_list);
4479         }
4480         spin_unlock(&ltds->ltd_lock);
4481
4482         if (likely(lad->lad_bitmap != NULL))
4483                 CFS_FREE_BITMAP(lad->lad_bitmap);
4484
4485         OBD_FREE_PTR(lad);
4486 }
4487
4488 static void lfsck_namespace_quit(const struct lu_env *env,
4489                                  struct lfsck_component *com)
4490 {
4491         struct lfsck_assistant_data     *lad    = com->lc_data;
4492         struct lfsck_tgt_descs          *ltds   = &com->lc_lfsck->li_mdt_descs;
4493         struct lfsck_tgt_desc           *ltd;
4494         struct lfsck_tgt_desc           *next;
4495
4496         LASSERT(lad != NULL);
4497
4498         lfsck_quit_generic(env, com);
4499
4500         LASSERT(thread_is_init(&lad->lad_thread) ||
4501                 thread_is_stopped(&lad->lad_thread));
4502         LASSERT(list_empty(&lad->lad_req_list));
4503
4504         lfsck_namespace_release_lmv(env, com);
4505
4506         spin_lock(&ltds->ltd_lock);
4507         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase1_list,
4508                                  ltd_namespace_phase_list) {
4509                 list_del_init(&ltd->ltd_namespace_phase_list);
4510         }
4511         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
4512                                  ltd_namespace_phase_list) {
4513                 list_del_init(&ltd->ltd_namespace_phase_list);
4514         }
4515         spin_unlock(&ltds->ltd_lock);
4516 }
4517
4518 static int lfsck_namespace_in_notify(const struct lu_env *env,
4519                                      struct lfsck_component *com,
4520                                      struct lfsck_request *lr,
4521                                      struct thandle *th)
4522 {
4523         struct lfsck_instance           *lfsck = com->lc_lfsck;
4524         struct lfsck_namespace          *ns    = com->lc_file_ram;
4525         struct lfsck_assistant_data     *lad   = com->lc_data;
4526         struct lfsck_tgt_descs          *ltds  = &lfsck->li_mdt_descs;
4527         struct lfsck_tgt_desc           *ltd;
4528         int                              rc;
4529         bool                             fail  = false;
4530         ENTRY;
4531
4532         switch (lr->lr_event) {
4533         case LE_SKIP_NLINK_DECLARE: {
4534                 struct dt_object        *obj;
4535                 struct lu_fid           *key   = &lfsck_env_info(env)->lti_fid3;
4536                 int                      idx;
4537                 __u8                     flags = 0;
4538
4539                 LASSERT(th != NULL);
4540
4541                 idx = lfsck_sub_trace_file_fid2idx(&lr->lr_fid);
4542                 obj = com->lc_sub_trace_objs[idx].lsto_obj;
4543                 fid_cpu_to_be(key, &lr->lr_fid);
4544                 mutex_lock(&com->lc_sub_trace_objs[idx].lsto_mutex);
4545                 rc = dt_declare_delete(env, obj,
4546                                        (const struct dt_key *)key, th);
4547                 if (rc == 0)
4548                         rc = dt_declare_insert(env, obj,
4549                                                (const struct dt_rec *)&flags,
4550                                                (const struct dt_key *)key, th);
4551                 mutex_unlock(&com->lc_sub_trace_objs[idx].lsto_mutex);
4552
4553                 RETURN(rc);
4554         }
4555         case LE_SKIP_NLINK: {
4556                 struct dt_object        *obj;
4557                 struct lu_fid           *key   = &lfsck_env_info(env)->lti_fid3;
4558                 int                      idx;
4559                 __u8                     flags = 0;
4560                 bool                     exist = false;
4561                 ENTRY;
4562
4563                 LASSERT(th != NULL);
4564
4565                 idx = lfsck_sub_trace_file_fid2idx(&lr->lr_fid);
4566                 obj = com->lc_sub_trace_objs[idx].lsto_obj;
4567                 fid_cpu_to_be(key, &lr->lr_fid);
4568                 mutex_lock(&com->lc_sub_trace_objs[idx].lsto_mutex);
4569                 rc = dt_lookup(env, obj, (struct dt_rec *)&flags,
4570                                (const struct dt_key *)key);
4571                 if (rc == 0) {
4572                         if (flags & LNTF_SKIP_NLINK) {
4573                                 mutex_unlock(
4574                                 &com->lc_sub_trace_objs[idx].lsto_mutex);
4575
4576                                 RETURN(0);
4577                         }
4578
4579                         exist = true;
4580                 } else if (rc != -ENOENT) {
4581                         GOTO(log, rc);
4582                 }
4583
4584                 flags |= LNTF_SKIP_NLINK;
4585                 if (exist) {
4586                         rc = dt_delete(env, obj, (const struct dt_key *)key,
4587                                        th);
4588                         if (rc != 0)
4589                                 GOTO(log, rc);
4590                 }
4591
4592                 rc = dt_insert(env, obj, (const struct dt_rec *)&flags,
4593                                (const struct dt_key *)key, th, 1);
4594
4595                 GOTO(log, rc);
4596
4597 log:
4598                 mutex_unlock(&com->lc_sub_trace_objs[idx].lsto_mutex);
4599                 CDEBUG(D_LFSCK, "%s: RPC service thread mark the "DFID
4600                        " to be skipped for namespace double scan: rc = %d\n",
4601                        lfsck_lfsck2name(com->lc_lfsck), PFID(&lr->lr_fid), rc);
4602
4603                 if (rc != 0)
4604                         /* If we cannot record this object in the LFSCK tracing,
4605                          * we have to mark the LFSC as LF_INCOMPLETE, then the
4606                          * LFSCK will skip nlink attribute verification for
4607                          * all objects. */
4608                         ns->ln_flags |= LF_INCOMPLETE;
4609
4610                 return 0;
4611         }
4612         case LE_SET_LMV_MASTER: {
4613                 struct dt_object        *obj;
4614
4615                 obj = lfsck_object_find_bottom(env, lfsck, &lr->lr_fid);
4616                 if (IS_ERR(obj))
4617                         RETURN(PTR_ERR(obj));
4618
4619                 rc = lfsck_namespace_notify_lmv_master_local(env, com, obj);
4620                 lfsck_object_put(env, obj);
4621
4622                 RETURN(rc > 0 ? 0 : rc);
4623         }
4624         case LE_SET_LMV_SLAVE: {
4625                 if (!(lr->lr_flags & LEF_RECHECK_NAME_HASH))
4626                         ns->ln_striped_shards_repaired++;
4627
4628                 rc = lfsck_namespace_trace_update(env, com, &lr->lr_fid,
4629                                                   LNTF_RECHECK_NAME_HASH, true);
4630
4631                 RETURN(rc > 0 ? 0 : rc);
4632         }
4633         case LE_PHASE1_DONE:
4634         case LE_PHASE2_DONE:
4635         case LE_PEER_EXIT:
4636                 break;
4637         default:
4638                 RETURN(-EINVAL);
4639         }
4640
4641         CDEBUG(D_LFSCK, "%s: namespace LFSCK handles notify %u from MDT %x, "
4642                "status %d, flags %x\n", lfsck_lfsck2name(lfsck), lr->lr_event,
4643                lr->lr_index, lr->lr_status, lr->lr_flags2);
4644
4645         spin_lock(&ltds->ltd_lock);
4646         ltd = LTD_TGT(ltds, lr->lr_index);
4647         if (ltd == NULL) {
4648                 spin_unlock(&ltds->ltd_lock);
4649
4650                 RETURN(-ENXIO);
4651         }
4652
4653         list_del_init(&ltd->ltd_namespace_phase_list);
4654         switch (lr->lr_event) {
4655         case LE_PHASE1_DONE:
4656                 if (lr->lr_status <= 0) {
4657                         ltd->ltd_namespace_done = 1;
4658                         list_del_init(&ltd->ltd_namespace_list);
4659                         CDEBUG(D_LFSCK, "%s: MDT %x failed/stopped at "
4660                                "phase1 for namespace LFSCK: rc = %d.\n",
4661                                lfsck_lfsck2name(lfsck),
4662                                ltd->ltd_index, lr->lr_status);
4663                         ns->ln_flags |= LF_INCOMPLETE;
4664                         fail = true;
4665                         break;
4666                 }
4667
4668                 if (lr->lr_flags2 & LF_INCOMPLETE)
4669                         ns->ln_flags |= LF_INCOMPLETE;
4670
4671                 if (list_empty(&ltd->ltd_namespace_list))
4672                         list_add_tail(&ltd->ltd_namespace_list,
4673                                       &lad->lad_mdt_list);
4674                 list_add_tail(&ltd->ltd_namespace_phase_list,
4675                               &lad->lad_mdt_phase2_list);
4676                 break;
4677         case LE_PHASE2_DONE:
4678                 ltd->ltd_namespace_done = 1;
4679                 list_del_init(&ltd->ltd_namespace_list);
4680                 break;
4681         case LE_PEER_EXIT:
4682                 fail = true;
4683                 ltd->ltd_namespace_done = 1;
4684                 list_del_init(&ltd->ltd_namespace_list);
4685                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT)) {
4686                         CDEBUG(D_LFSCK,
4687                                "%s: the peer MDT %x exit namespace LFSCK\n",
4688                                lfsck_lfsck2name(lfsck), ltd->ltd_index);
4689                         ns->ln_flags |= LF_INCOMPLETE;
4690                 }
4691                 break;
4692         default:
4693                 break;
4694         }
4695         spin_unlock(&ltds->ltd_lock);
4696
4697         if (fail && lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT) {
4698                 struct lfsck_stop *stop = &lfsck_env_info(env)->lti_stop;
4699
4700                 memset(stop, 0, sizeof(*stop));
4701                 stop->ls_status = lr->lr_status;
4702                 stop->ls_flags = lr->lr_param & ~LPF_BROADCAST;
4703                 lfsck_stop(env, lfsck->li_bottom, stop);
4704         } else if (lfsck_phase2_next_ready(lad)) {
4705                 wake_up_all(&lad->lad_thread.t_ctl_waitq);
4706         }
4707
4708         RETURN(0);
4709 }
4710
4711 static int lfsck_namespace_query(const struct lu_env *env,
4712                                  struct lfsck_component *com)
4713 {
4714         struct lfsck_namespace *ns = com->lc_file_ram;
4715
4716         return ns->ln_status;
4717 }
4718
4719 static struct lfsck_operations lfsck_namespace_ops = {
4720         .lfsck_reset            = lfsck_namespace_reset,
4721         .lfsck_fail             = lfsck_namespace_fail,
4722         .lfsck_close_dir        = lfsck_namespace_close_dir,
4723         .lfsck_open_dir         = lfsck_namespace_open_dir,
4724         .lfsck_checkpoint       = lfsck_namespace_checkpoint,
4725         .lfsck_prep             = lfsck_namespace_prep,
4726         .lfsck_exec_oit         = lfsck_namespace_exec_oit,
4727         .lfsck_exec_dir         = lfsck_namespace_exec_dir,
4728         .lfsck_post             = lfsck_namespace_post,
4729         .lfsck_dump             = lfsck_namespace_dump,
4730         .lfsck_double_scan      = lfsck_namespace_double_scan,
4731         .lfsck_data_release     = lfsck_namespace_data_release,
4732         .lfsck_quit             = lfsck_namespace_quit,
4733         .lfsck_in_notify        = lfsck_namespace_in_notify,
4734         .lfsck_query            = lfsck_namespace_query,
4735 };
4736
4737 /**
4738  * Repair dangling name entry.
4739  *
4740  * For the name entry with dangling reference, we need to repare the
4741  * inconsistency according to the LFSCK sponsor's requirement:
4742  *
4743  * 1) Keep the inconsistency there and report the inconsistency case,
4744  *    then give the chance to the application to find related issues,
4745  *    and the users can make the decision about how to handle it with
4746  *    more human knownledge. (by default)
4747  *
4748  * 2) Re-create the missing MDT-object with the FID information.
4749  *
4750  * \param[in] env       pointer to the thread context
4751  * \param[in] com       pointer to the lfsck component
4752  * \param[in] parent    pointer to the dir object that contains the dangling
4753  *                      name entry
4754  * \param[in] child     pointer to the object corresponding to the dangling
4755  *                      name entry
4756  * \param[in] lnr       pointer to the namespace request that contains the
4757  *                      name's name, parent object, parent's LMV, and ect.
4758  *
4759  * \retval              positive number if no need to repair
4760  * \retval              zero for repaired successfully
4761  * \retval              negative error number on failure
4762  */
4763 int lfsck_namespace_repair_dangling(const struct lu_env *env,
4764                                     struct lfsck_component *com,
4765                                     struct dt_object *parent,
4766                                     struct dt_object *child,
4767                                     struct lfsck_namespace_req *lnr)
4768 {
4769         struct lfsck_thread_info        *info   = lfsck_env_info(env);
4770         struct lu_attr                  *la     = &info->lti_la;
4771         struct dt_allocation_hint       *hint   = &info->lti_hint;
4772         struct dt_object_format         *dof    = &info->lti_dof;
4773         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
4774         struct lmv_mds_md_v1            *lmv2   = &info->lti_lmv2;
4775         struct dt_object                *pobj   = NULL;
4776         struct dt_object                *cobj   = NULL;
4777         const struct lu_name            *cname;
4778         struct linkea_data               ldata  = { NULL };
4779         struct lfsck_lock_handle        *llh    = &info->lti_llh;
4780         struct lu_buf                    linkea_buf;
4781         struct lu_buf                    lmv_buf;
4782         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4783         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
4784         struct dt_device                *dev    = lfsck->li_next;
4785         struct thandle                  *th     = NULL;
4786         int                              rc     = 0;
4787         __u16                            type   = lnr->lnr_type;
4788         bool                             create;
4789         ENTRY;
4790
4791         cname = lfsck_name_get_const(env, lnr->lnr_name, lnr->lnr_namelen);
4792         if (bk->lb_param & LPF_CREATE_MDTOBJ)
4793                 create = true;
4794         else
4795                 create = false;
4796
4797         if (!create || bk->lb_param & LPF_DRYRUN)
4798                 GOTO(log, rc = 0);
4799
4800         /* We may need to create the sub-objects of the @child via LOD,
4801          * so make the modification based on lfsck->li_next. */
4802
4803         pobj = lfsck_object_locate(dev, parent);
4804         if (IS_ERR(pobj))
4805                 GOTO(log, rc = PTR_ERR(pobj));
4806
4807         if (unlikely(!dt_try_as_dir(env, pobj)))
4808                 GOTO(log, rc = -ENOTDIR);
4809
4810         cobj = lfsck_object_locate(dev, child);
4811         if (IS_ERR(cobj))
4812                 GOTO(log, rc = PTR_ERR(cobj));
4813
4814         rc = linkea_data_new(&ldata, &info->lti_linkea_buf2);
4815         if (rc != 0)
4816                 GOTO(log, rc);
4817
4818         rc = linkea_add_buf(&ldata, cname, lfsck_dto2fid(pobj));
4819         if (rc != 0)
4820                 GOTO(log, rc);
4821
4822         rc = lfsck_lock(env, lfsck, parent, lnr->lnr_name, llh,
4823                         MDS_INODELOCK_UPDATE, LCK_PR);
4824         if (rc != 0)
4825                 GOTO(log, rc);
4826
4827         rc = lfsck_namespace_check_exist(env, pobj, cobj, lnr->lnr_name);
4828         if (rc != 0)
4829                 GOTO(log, rc);
4830
4831         /* Set the ctime as zero, then others can know it is created for
4832          * repairing dangling name entry by LFSCK. And if the LFSCK made
4833          * wrong decision and the real MDT-object has been found later,
4834          * then the LFSCK has chance to fix the incosistency properly. */
4835         memset(la, 0, sizeof(*la));
4836         la->la_mode = (type & S_IFMT) | 0600;
4837         la->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
4838                         LA_ATIME | LA_MTIME | LA_CTIME;
4839
4840         cobj->do_ops->do_ah_init(env, hint, pobj, cobj,
4841                                  la->la_mode & S_IFMT);
4842
4843         memset(dof, 0, sizeof(*dof));
4844         dof->dof_type = dt_mode_to_dft(type);
4845         /* If the target is a regular file, then the LFSCK will only create
4846          * the MDT-object without stripes (dof->dof_reg.striped = 0). related
4847          * OST-objects will be created when write open. */
4848
4849         th = dt_trans_create(env, dev);
4850         if (IS_ERR(th))
4851                 GOTO(log, rc = PTR_ERR(th));
4852
4853         /* 1a. create child. */
4854         rc = dt_declare_create(env, cobj, la, hint, dof, th);
4855         if (rc != 0)
4856                 GOTO(stop, rc);
4857
4858         if (S_ISDIR(type)) {
4859                 if (unlikely(!dt_try_as_dir(env, cobj)))
4860                         GOTO(stop, rc = -ENOTDIR);
4861
4862                 /* 2a. insert dot into child dir */
4863                 rec->rec_type = S_IFDIR;
4864                 rec->rec_fid = lfsck_dto2fid(cobj);
4865                 rc = dt_declare_insert(env, cobj,
4866                                        (const struct dt_rec *)rec,
4867                                        (const struct dt_key *)dot, th);
4868                 if (rc != 0)
4869                         GOTO(stop, rc);
4870
4871                 /* 3a. insert dotdot into child dir */
4872                 rec->rec_fid = lfsck_dto2fid(pobj);
4873                 rc = dt_declare_insert(env, cobj,
4874                                        (const struct dt_rec *)rec,
4875                                        (const struct dt_key *)dotdot, th);
4876                 if (rc != 0)
4877                         GOTO(stop, rc);
4878
4879                 /* 4a. increase child nlink */
4880                 rc = dt_declare_ref_add(env, cobj, th);
4881                 if (rc != 0)
4882                         GOTO(stop, rc);
4883
4884                 /* 5a. generate slave LMV EA. */
4885                 if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
4886                         int idx;
4887
4888                         idx = lfsck_shard_name_to_index(env,
4889                                         lnr->lnr_name, lnr->lnr_namelen,
4890                                         type, lfsck_dto2fid(cobj));
4891                         if (unlikely(idx < 0))
4892                                 GOTO(stop, rc = idx);
4893
4894                         *lmv2 = lnr->lnr_lmv->ll_lmv;
4895                         lmv2->lmv_magic = LMV_MAGIC_STRIPE;
4896                         lmv2->lmv_master_mdt_index = idx;
4897
4898                         lfsck_lmv_header_cpu_to_le(lmv2, lmv2);
4899                         lfsck_buf_init(&lmv_buf, lmv2, sizeof(*lmv2));
4900                         rc = dt_declare_xattr_set(env, cobj, &lmv_buf,
4901                                                   XATTR_NAME_LMV, 0, th);
4902                         if (rc != 0)
4903                                 GOTO(stop, rc);
4904                 }
4905         }
4906
4907         /* 6a. insert linkEA for child */
4908         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
4909                        ldata.ld_leh->leh_len);
4910         rc = dt_declare_xattr_set(env, cobj, &linkea_buf,
4911                                   XATTR_NAME_LINK, 0, th);
4912         if (rc != 0)
4913                 GOTO(stop, rc);
4914
4915         rc = dt_trans_start_local(env, dev, th);
4916         if (rc != 0)
4917                 GOTO(stop, rc = (rc == -EEXIST ? 1 : rc));
4918
4919         dt_write_lock(env, cobj, 0);
4920         /* 1b. create child */
4921         rc = dt_create(env, cobj, la, hint, dof, th);
4922         if (rc != 0)
4923                 GOTO(unlock, rc = (rc == -EEXIST ? 1 : rc));
4924
4925         if (S_ISDIR(type)) {
4926                 /* 2b. insert dot into child dir */
4927                 rec->rec_type = S_IFDIR;
4928                 rec->rec_fid = lfsck_dto2fid(cobj);
4929                 rc = dt_insert(env, cobj, (const struct dt_rec *)rec,
4930                                (const struct dt_key *)dot, th, 1);
4931                 if (rc != 0)
4932                         GOTO(unlock, rc);
4933
4934                 /* 3b. insert dotdot into child dir */
4935                 rec->rec_fid = lfsck_dto2fid(pobj);
4936                 rc = dt_insert(env, cobj, (const struct dt_rec *)rec,
4937                                (const struct dt_key *)dotdot, th, 1);
4938                 if (rc != 0)
4939                         GOTO(unlock, rc);
4940
4941                 /* 4b. increase child nlink */
4942                 rc = dt_ref_add(env, cobj, th);
4943                 if (rc != 0)
4944                         GOTO(unlock, rc);
4945
4946                 /* 5b. generate slave LMV EA. */
4947                 if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
4948                         rc = dt_xattr_set(env, cobj, &lmv_buf, XATTR_NAME_LMV,
4949                                           0, th);
4950                         if (rc != 0)
4951                                 GOTO(unlock, rc);
4952                 }
4953         }
4954
4955         /* 6b. insert linkEA for child. */
4956         rc = dt_xattr_set(env, cobj, &linkea_buf,
4957                           XATTR_NAME_LINK, 0, th);
4958
4959         GOTO(unlock, rc);
4960
4961 unlock:
4962         dt_write_unlock(env, cobj);
4963
4964 stop:
4965         dt_trans_stop(env, dev, th);
4966
4967 log:
4968         lfsck_unlock(llh);
4969         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found dangling "
4970                "reference for: parent "DFID", child "DFID", type %u, "
4971                "name %s. %s: rc = %d\n", lfsck_lfsck2name(lfsck),
4972                PFID(&lnr->lnr_lar.lar_fid), PFID(lfsck_dto2fid(child)),
4973                type, cname->ln_name,
4974                create ? "Create the lost OST-object as required" :
4975                         "Keep the MDT-object there by default", rc);
4976
4977         if (rc <= 0) {
4978                 struct lfsck_namespace *ns = com->lc_file_ram;
4979
4980                 ns->ln_flags |= LF_INCONSISTENT;
4981         }
4982
4983         return rc;
4984 }
4985
4986 static int lfsck_namespace_assistant_handler_p1(const struct lu_env *env,
4987                                                 struct lfsck_component *com,
4988                                                 struct lfsck_assistant_req *lar)
4989 {
4990         struct lfsck_thread_info   *info     = lfsck_env_info(env);
4991         struct lu_attr             *la       = &info->lti_la;
4992         struct lfsck_instance      *lfsck    = com->lc_lfsck;
4993         struct lfsck_bookmark      *bk       = &lfsck->li_bookmark_ram;
4994         struct lfsck_namespace     *ns       = com->lc_file_ram;
4995         struct linkea_data          ldata    = { NULL };
4996         const struct lu_name       *cname;
4997         struct thandle             *handle   = NULL;
4998         struct lfsck_namespace_req *lnr      =
4999                         container_of0(lar, struct lfsck_namespace_req, lnr_lar);
5000         struct dt_object           *dir      = NULL;
5001         struct dt_object           *obj      = NULL;
5002         const struct lu_fid        *pfid;
5003         struct dt_device           *dev      = NULL;
5004         struct lustre_handle        lh       = { 0 };
5005         bool                        repaired = false;
5006         bool                        dtlocked = false;
5007         bool                        remove;
5008         bool                        newdata;
5009         bool                        log      = false;
5010         bool                        bad_hash = false;
5011         int                         idx      = 0;
5012         int                         count    = 0;
5013         int                         rc       = 0;
5014         enum lfsck_namespace_inconsistency_type type = LNIT_NONE;
5015         ENTRY;
5016
5017         dir = lfsck_object_find_bottom(env, lfsck, &lar->lar_fid);
5018         if (IS_ERR(dir))
5019                 RETURN(PTR_ERR(dir));
5020
5021         if (unlikely(lfsck_is_dead_obj(dir)))
5022                 GOTO(put_dir, rc = 0);
5023
5024         if (unlikely(!dt_try_as_dir(env, dir)))
5025                 GOTO(put_dir, rc = -ENOTDIR);
5026
5027         pfid = lfsck_dto2fid(dir);
5028         la->la_nlink = 0;
5029         if (lnr->lnr_attr & LUDA_UPGRADE) {
5030                 ns->ln_flags |= LF_UPGRADE;
5031                 ns->ln_dirent_repaired++;
5032                 repaired = true;
5033         } else if (lnr->lnr_attr & LUDA_REPAIR) {
5034                 ns->ln_flags |= LF_INCONSISTENT;
5035                 ns->ln_dirent_repaired++;
5036                 repaired = true;
5037         }
5038
5039         if (unlikely(fid_is_zero(&lnr->lnr_fid))) {
5040                 if (strcmp(lnr->lnr_name, dotdot) != 0)
5041                         LBUG();
5042                 else
5043                         rc = lfsck_namespace_trace_update(env, com, pfid,
5044                                                 LNTF_CHECK_PARENT, true);
5045
5046                 GOTO(out, rc);
5047         }
5048
5049         if (unlikely(!fid_is_sane(&lnr->lnr_fid))) {
5050                 CDEBUG(D_LFSCK, "%s: dir scan find invalid FID "DFID
5051                        " for the name entry %.*s under "DFID"\n",
5052                        lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid),
5053                        lnr->lnr_namelen, lnr->lnr_name, PFID(pfid));
5054
5055                 if (strcmp(lnr->lnr_name, dotdot) != 0)
5056                         /* invalid FID means bad name entry, remove it. */
5057                         type = LNIT_BAD_DIRENT;
5058                 else
5059                         /* If the parent FID is invalid, we cannot remove
5060                          * the ".." entry directly. */
5061                         rc = lfsck_namespace_trace_update(env, com, pfid,
5062                                                 LNTF_CHECK_PARENT, true);
5063
5064                 GOTO(out, rc);
5065         }
5066
5067         if (unlikely(lnr->lnr_dir_cookie == MDS_DIR_END_OFF)) {
5068                 rc = lfsck_namespace_striped_dir_rescan(env, com, dir, lnr);
5069
5070                 GOTO(put_dir, rc);
5071         }
5072
5073         if (fid_seq_is_dot(fid_seq(&lnr->lnr_fid)))
5074                 GOTO(out, rc = 0);
5075
5076         if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
5077                 rc = lfsck_namespace_handle_striped_master(env, com, dir, lnr);
5078
5079                 GOTO(put_dir, rc);
5080         }
5081
5082         idx = lfsck_find_mdt_idx_by_fid(env, lfsck, &lnr->lnr_fid);
5083         if (idx < 0)
5084                 GOTO(out, rc = idx);
5085
5086         if (idx == lfsck_dev_idx(lfsck)) {
5087                 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0))
5088                         GOTO(out, rc = 0);
5089
5090                 dev = lfsck->li_bottom;
5091         } else {
5092                 struct lfsck_tgt_desc *ltd;
5093
5094                 /* Usually, some local filesystem consistency verification
5095                  * tools can guarantee the local namespace tree consistenct.
5096                  * So the LFSCK will only verify the remote directory. */
5097                 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0)) {
5098                         rc = lfsck_namespace_trace_update(env, com, pfid,
5099                                                 LNTF_CHECK_PARENT, true);
5100
5101                         GOTO(out, rc);
5102                 }
5103
5104                 ltd = LTD_TGT(&lfsck->li_mdt_descs, idx);
5105                 if (unlikely(ltd == NULL)) {
5106                         CDEBUG(D_LFSCK, "%s: cannot talk with MDT %x which "
5107                                "did not join the namespace LFSCK\n",
5108                                lfsck_lfsck2name(lfsck), idx);
5109                         lfsck_lad_set_bitmap(env, com, idx);
5110
5111                         GOTO(out, rc = -ENODEV);
5112                 }
5113
5114                 dev = ltd->ltd_tgt;
5115         }
5116
5117         obj = lfsck_object_find_by_dev(env, dev, &lnr->lnr_fid);
5118         if (IS_ERR(obj))
5119                 GOTO(out, rc = PTR_ERR(obj));
5120
5121         cname = lfsck_name_get_const(env, lnr->lnr_name, lnr->lnr_namelen);
5122         if (dt_object_exists(obj) == 0) {
5123
5124 dangling:
5125                 rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
5126                 if (rc == 0) {
5127                         if (!lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
5128                                         lnr->lnr_name, lnr->lnr_namelen)) {
5129                                 type = LNIT_BAD_DIRENT;
5130
5131                                 GOTO(out, rc);
5132                         }
5133
5134                         type = LNIT_DANGLING;
5135                         rc = lfsck_namespace_repair_dangling(env, com, dir,
5136                                                              obj, lnr);
5137                         if (rc == 0)
5138                                 repaired = true;
5139                 }
5140
5141                 GOTO(out, rc);
5142         }
5143
5144         if (!(bk->lb_param & LPF_DRYRUN) && repaired) {
5145
5146 again:
5147                 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
5148                                       MDS_INODELOCK_UPDATE |
5149                                       MDS_INODELOCK_XATTR, LCK_EX);
5150                 if (rc != 0)
5151                         GOTO(out, rc);
5152
5153                 handle = dt_trans_create(env, dev);
5154                 if (IS_ERR(handle))
5155                         GOTO(out, rc = PTR_ERR(handle));
5156
5157                 rc = lfsck_declare_namespace_exec_dir(env, obj, handle);
5158                 if (rc != 0)
5159                         GOTO(stop, rc);
5160
5161                 rc = dt_trans_start_local(env, dev, handle);
5162                 if (rc != 0)
5163                         GOTO(stop, rc);
5164
5165                 dt_write_lock(env, obj, 0);
5166                 dtlocked = true;
5167         }
5168
5169         rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
5170         if (rc != 0)
5171                 GOTO(stop, rc);
5172
5173         rc = lfsck_links_read(env, obj, &ldata);
5174         if (unlikely(rc == -ENOENT)) {
5175                 if (handle != NULL) {
5176                         dt_write_unlock(env, obj);
5177                         dtlocked = false;
5178
5179                         dt_trans_stop(env, dev, handle);
5180                         handle = NULL;
5181
5182                         lfsck_ibits_unlock(&lh, LCK_EX);
5183                 }
5184
5185                 /* It may happen when the remote object has been removed,
5186                  * but the local MDT is not aware of that. */
5187                 goto dangling;
5188         } else if (rc == 0) {
5189                 count = ldata.ld_leh->leh_reccount;
5190                 rc = linkea_links_find(&ldata, cname, pfid);
5191                 if ((rc == 0) &&
5192                     (count == 1 || !S_ISDIR(lfsck_object_type(obj)))) {
5193                         if ((lfsck_object_type(obj) & S_IFMT) !=
5194                             lnr->lnr_type) {
5195                                 ns->ln_flags |= LF_INCONSISTENT;
5196                                 type = LNIT_BAD_TYPE;
5197                         }
5198
5199                         goto stop;
5200                 }
5201
5202                 ns->ln_flags |= LF_INCONSISTENT;
5203
5204                 /* If the name entry hash does not match the slave striped
5205                  * directory, and the name entry does not match also, then
5206                  * it is quite possible that name entry is corrupted. */
5207                 if (!lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
5208                                         lnr->lnr_name, lnr->lnr_namelen)) {
5209                         type = LNIT_BAD_DIRENT;
5210
5211                         GOTO(stop, rc = 0);
5212                 }
5213
5214                 /* If the file type stored in the name entry does not match
5215                  * the file type claimed by the object, and the object does
5216                  * not recognize the name entry, then it is quite possible
5217                  * that the name entry is corrupted. */
5218                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type) {
5219                         type = LNIT_BAD_DIRENT;
5220
5221                         GOTO(stop, rc = 0);
5222                 }
5223
5224                 /* For sub-dir object, we cannot make sure whether the sub-dir
5225                  * back references the parent via ".." name entry correctly or
5226                  * not in the LFSCK first-stage scanning. It may be that the
5227                  * (remote) sub-dir ".." name entry has no parent FID after
5228                  * file-level backup/restore and its linkEA may be wrong.
5229                  * So under such case, we should replace the linkEA according
5230                  * to current name entry. But this needs to be done during the
5231                  * LFSCK second-stage scanning. The LFSCK will record the name
5232                  * entry for further possible using. */
5233                 remove = false;
5234                 newdata = false;
5235                 goto nodata;
5236         } else if (unlikely(rc == -EINVAL)) {
5237                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type)
5238                         type = LNIT_BAD_TYPE;
5239
5240                 count = 1;
5241                 ns->ln_flags |= LF_INCONSISTENT;
5242                 /* The magic crashed, we are not sure whether there are more
5243                  * corrupt data in the linkea, so remove all linkea entries. */
5244                 remove = true;
5245                 newdata = true;
5246                 goto nodata;
5247         } else if (rc == -ENODATA) {
5248                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type)
5249                         type = LNIT_BAD_TYPE;
5250
5251                 count = 1;
5252                 ns->ln_flags |= LF_UPGRADE;
5253                 remove = false;
5254                 newdata = true;
5255
5256 nodata:
5257                 if (bk->lb_param & LPF_DRYRUN) {
5258                         ns->ln_linkea_repaired++;
5259                         repaired = true;
5260                         log = true;
5261                         goto stop;
5262                 }
5263
5264                 if (!lustre_handle_is_used(&lh))
5265                         goto again;
5266
5267                 if (remove) {
5268                         LASSERT(newdata);
5269
5270                         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, handle);
5271                         if (rc != 0)
5272                                 GOTO(stop, rc);
5273                 }
5274
5275                 if (newdata) {
5276                         rc = linkea_data_new(&ldata,
5277                                         &lfsck_env_info(env)->lti_linkea_buf);
5278                         if (rc != 0)
5279                                 GOTO(stop, rc);
5280                 }
5281
5282                 rc = linkea_add_buf(&ldata, cname, pfid);
5283                 if (rc != 0)
5284                         GOTO(stop, rc);
5285
5286                 rc = lfsck_links_write(env, obj, &ldata, handle);
5287                 if (unlikely(rc == -ENOSPC) &&
5288                     S_ISREG(lfsck_object_type(obj)) && !dt_object_remote(obj)) {
5289                         if (handle != NULL) {
5290                                 LASSERT(dt_write_locked(env, obj));
5291
5292                                 dt_write_unlock(env, obj);
5293                                 dtlocked = false;
5294
5295                                 dt_trans_stop(env, dev, handle);
5296                                 handle = NULL;
5297
5298                                 lfsck_ibits_unlock(&lh, LCK_EX);
5299                         }
5300
5301                         rc = lfsck_namespace_trace_update(env, com,
5302                                         &lnr->lnr_fid, LNTF_SKIP_NLINK, true);
5303                         if (rc != 0)
5304                                 /* If we cannot record this object in the
5305                                  * LFSCK tracing, we have to mark the LFSCK
5306                                  * as LF_INCOMPLETE, then the LFSCK will
5307                                  * skip nlink attribute verification for
5308                                  * all objects. */
5309                                 ns->ln_flags |= LF_INCOMPLETE;
5310
5311                         GOTO(out, rc = 0);
5312                 }
5313
5314                 if (rc != 0)
5315                         GOTO(stop, rc);
5316
5317                 count = ldata.ld_leh->leh_reccount;
5318                 if (!S_ISDIR(lfsck_object_type(obj)) ||
5319                     !dt_object_remote(obj)) {
5320                         ns->ln_linkea_repaired++;
5321                         repaired = true;
5322                         log = true;
5323                 }
5324         } else {
5325                 GOTO(stop, rc);
5326         }
5327
5328 stop:
5329         if (dtlocked)
5330                 dt_write_unlock(env, obj);
5331
5332         if (handle != NULL && !IS_ERR(handle))
5333                 dt_trans_stop(env, dev, handle);
5334
5335 out:
5336         lfsck_ibits_unlock(&lh, LCK_EX);
5337
5338         if (!name_is_dot_or_dotdot(lnr->lnr_name, lnr->lnr_namelen) &&
5339             !lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
5340                                              lnr->lnr_name, lnr->lnr_namelen) &&
5341             type != LNIT_BAD_DIRENT) {
5342                 ns->ln_flags |= LF_INCONSISTENT;
5343
5344                 log = false;
5345                 rc = lfsck_namespace_repair_bad_name_hash(env, com, dir,
5346                                                 lnr->lnr_lmv, lnr->lnr_name);
5347                 if (rc >= 0)
5348                         bad_hash = true;
5349         }
5350
5351         if (rc >= 0) {
5352                 switch (type) {
5353                 case LNIT_BAD_TYPE:
5354                         log = false;
5355                         rc = lfsck_namespace_repair_dirent(env, com, dir,
5356                                         obj, lnr->lnr_name, lnr->lnr_name,
5357                                         lnr->lnr_type, true, false);
5358                         if (rc > 0)
5359                                 repaired = true;
5360                         break;
5361                 case LNIT_BAD_DIRENT:
5362                         log = false;
5363                         /* XXX: This is a bad dirent, we do not know whether
5364                          *      the original name entry reference a regular
5365                          *      file or a directory, then keep the parent's
5366                          *      nlink count unchanged here. */
5367                         rc = lfsck_namespace_repair_dirent(env, com, dir,
5368                                         obj, lnr->lnr_name, lnr->lnr_name,
5369                                         lnr->lnr_type, false, false);
5370                         if (rc > 0)
5371                                 repaired = true;
5372                         break;
5373                 default:
5374                         break;
5375                 }
5376
5377                 if (count == 1 && S_ISREG(lfsck_object_type(obj)))
5378                         dt_attr_get(env, obj, la);
5379         }
5380
5381         down_write(&com->lc_sem);
5382         if (rc < 0) {
5383                 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail to handle "
5384                        "the entry: "DFID", parent "DFID", name %.*s: rc = %d\n",
5385                        lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid),
5386                        PFID(lfsck_dto2fid(dir)),
5387                        lnr->lnr_namelen, lnr->lnr_name, rc);
5388
5389                 lfsck_namespace_record_failure(env, lfsck, ns);
5390                 if ((rc == -ENOTCONN || rc == -ESHUTDOWN || rc == -EREMCHG ||
5391                      rc == -ETIMEDOUT || rc == -EHOSTDOWN ||
5392                      rc == -EHOSTUNREACH || rc == -EINPROGRESS) &&
5393                     dev != NULL && dev != lfsck->li_bottom)
5394                         lfsck_lad_set_bitmap(env, com, idx);
5395
5396                 if (!(bk->lb_param & LPF_FAILOUT))
5397                         rc = 0;
5398         } else {
5399                 if (log)
5400                         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant "
5401                                "repaired the entry: "DFID", parent "DFID
5402                                ", name %.*s\n", lfsck_lfsck2name(lfsck),
5403                                PFID(&lnr->lnr_fid),
5404                                PFID(lfsck_dto2fid(dir)),
5405                                lnr->lnr_namelen, lnr->lnr_name);
5406
5407                 if (repaired) {
5408                         ns->ln_items_repaired++;
5409
5410                         switch (type) {
5411                         case LNIT_DANGLING:
5412                                 ns->ln_dangling_repaired++;
5413                                 break;
5414                         case LNIT_BAD_TYPE:
5415                                 ns->ln_bad_type_repaired++;
5416                                 break;
5417                         case LNIT_BAD_DIRENT:
5418                                 ns->ln_dirent_repaired++;
5419                                 break;
5420                         default:
5421                                 break;
5422                         }
5423
5424                         if (bk->lb_param & LPF_DRYRUN &&
5425                             lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
5426                                 lfsck_pos_fill(env, lfsck,
5427                                                &ns->ln_pos_first_inconsistent,
5428                                                false);
5429                 }
5430
5431                 if (bad_hash) {
5432                         ns->ln_name_hash_repaired++;
5433
5434                         /* Not count repeatedly. */
5435                         if (!repaired)
5436                                 ns->ln_items_repaired++;
5437
5438                         if (bk->lb_param & LPF_DRYRUN &&
5439                             lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
5440                                 lfsck_pos_fill(env, lfsck,
5441                                                &ns->ln_pos_first_inconsistent,
5442                                                false);
5443                 }
5444
5445                 rc = 0;
5446         }
5447
5448         if (count > 1 || la->la_nlink > 1)
5449                 ns->ln_mul_linked_checked++;
5450
5451         up_write(&com->lc_sem);
5452
5453         if (obj != NULL && !IS_ERR(obj))
5454                 lfsck_object_put(env, obj);
5455
5456 put_dir:
5457         lfsck_object_put(env, dir);
5458
5459         return rc;
5460 }
5461
5462 /**
5463  * Handle one orphan under the backend /lost+found directory
5464  *
5465  * Insert the orphan FID into the namespace LFSCK trace file for further
5466  * processing (via the subsequent namespace LFSCK second-stage scanning).
5467  * At the same time, remove the orphan name entry from backend /lost+found
5468  * directory. There is an interval between the orphan name entry removed
5469  * from the backend /lost+found directory and the orphan FID in the LFSCK
5470  * trace file handled. In such interval, the LFSCK can be reset, then
5471  * all the FIDs recorded in the namespace LFSCK trace file will be dropped.
5472  * To guarantee that the orphans can be found when LFSCK run next time
5473  * without e2fsck again, when remove the orphan name entry, the LFSCK
5474  * will set the orphan's ctime attribute as 1. Since normal applications
5475  * cannot change the object's ctime attribute as 1. Then when LFSCK run
5476  * next time, it can record the object (that ctime is 1) in the namespace
5477  * LFSCK trace file during the first-stage scanning.
5478  *
5479  * \param[in] env       pointer to the thread context
5480  * \param[in] com       pointer to the lfsck component
5481  * \param[in] parent    pointer to the object for the backend /lost+found
5482  * \param[in] ent       pointer to the name entry for the target under the
5483  *                      backend /lost+found
5484  *
5485  * \retval              positive for repaired
5486  * \retval              0 if needs to repair nothing
5487  * \retval              negative error number on failure
5488  */
5489 static int lfsck_namespace_scan_local_lpf_one(const struct lu_env *env,
5490                                               struct lfsck_component *com,
5491                                               struct dt_object *parent,
5492                                               struct lu_dirent *ent)
5493 {
5494         struct lfsck_thread_info        *info   = lfsck_env_info(env);
5495         struct lu_fid                   *key    = &info->lti_fid;
5496         struct lu_attr                  *la     = &info->lti_la;
5497         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5498         struct dt_object                *obj;
5499         struct dt_device                *dev    = lfsck->li_bottom;
5500         struct dt_object                *child  = NULL;
5501         struct thandle                  *th     = NULL;
5502         int                              idx;
5503         int                              rc     = 0;
5504         __u8                             flags  = 0;
5505         bool                             exist  = false;
5506         ENTRY;
5507
5508         child = lfsck_object_find_by_dev(env, dev, &ent->lde_fid);
5509         if (IS_ERR(child))
5510                 RETURN(PTR_ERR(child));
5511
5512         LASSERT(dt_object_exists(child));
5513         LASSERT(!dt_object_remote(child));
5514
5515         idx = lfsck_sub_trace_file_fid2idx(&ent->lde_fid);
5516         obj = com->lc_sub_trace_objs[idx].lsto_obj;
5517         fid_cpu_to_be(key, &ent->lde_fid);
5518         rc = dt_lookup(env, obj, (struct dt_rec *)&flags,
5519                        (const struct dt_key *)key);
5520         if (rc == 0) {
5521                 exist = true;
5522                 flags |= LNTF_CHECK_ORPHAN;
5523         } else if (rc == -ENOENT) {
5524                 flags = LNTF_CHECK_ORPHAN;
5525         } else {
5526                 GOTO(out, rc);
5527         }
5528
5529         th = dt_trans_create(env, dev);
5530         if (IS_ERR(th))
5531                 GOTO(out, rc = PTR_ERR(th));
5532
5533         /* a1. remove name entry from backend /lost+found */
5534         rc = dt_declare_delete(env, parent,
5535                                (const struct dt_key *)ent->lde_name, th);
5536         if (rc != 0)
5537                 GOTO(stop, rc);
5538
5539         if (S_ISDIR(lfsck_object_type(child))) {
5540                 /* a2. decrease parent's nlink */
5541                 rc = dt_declare_ref_del(env, parent, th);
5542                 if (rc != 0)
5543                         GOTO(stop, rc);
5544         }
5545
5546         if (exist) {
5547                 /* a3. remove child's FID from the LFSCK trace file. */
5548                 rc = dt_declare_delete(env, obj,
5549                                        (const struct dt_key *)key, th);
5550                 if (rc != 0)
5551                         GOTO(stop, rc);
5552         } else {
5553                 /* a4. set child's ctime as 1 */
5554                 memset(la, 0, sizeof(*la));
5555                 la->la_ctime = 1;
5556                 la->la_valid = LA_CTIME;
5557                 rc = dt_declare_attr_set(env, child, la, th);
5558                 if (rc != 0)
5559                         GOTO(stop, rc);
5560         }
5561
5562         /* a5. insert child's FID into the LFSCK trace file. */
5563         rc = dt_declare_insert(env, obj, (const struct dt_rec *)&flags,
5564                                (const struct dt_key *)key, th);
5565         if (rc != 0)
5566                 GOTO(stop, rc);
5567
5568         rc = dt_trans_start_local(env, dev, th);
5569         if (rc != 0)
5570                 GOTO(stop, rc);
5571
5572         /* b1. remove name entry from backend /lost+found */
5573         rc = dt_delete(env, parent, (const struct dt_key *)ent->lde_name, th);
5574         if (rc != 0)
5575                 GOTO(stop, rc);
5576
5577         if (S_ISDIR(lfsck_object_type(child))) {
5578                 /* b2. decrease parent's nlink */
5579                 dt_write_lock(env, parent, 0);
5580                 rc = dt_ref_del(env, parent, th);
5581                 dt_write_unlock(env, parent);
5582                 if (rc != 0)
5583                         GOTO(stop, rc);
5584         }
5585
5586         if (exist) {
5587                 /* a3. remove child's FID from the LFSCK trace file. */
5588                 rc = dt_delete(env, obj, (const struct dt_key *)key, th);
5589                 if (rc != 0)
5590                         GOTO(stop, rc);
5591         } else {
5592                 /* b4. set child's ctime as 1 */
5593                 rc = dt_attr_set(env, child, la, th);
5594                 if (rc != 0)
5595                         GOTO(stop, rc);
5596         }
5597
5598         /* b5. insert child's FID into the LFSCK trace file. */
5599         rc = dt_insert(env, obj, (const struct dt_rec *)&flags,
5600                        (const struct dt_key *)key, th, 1);
5601
5602         GOTO(stop, rc = (rc == 0 ? 1 : rc));
5603
5604 stop:
5605         dt_trans_stop(env, dev, th);
5606
5607 out:
5608         lfsck_object_put(env, child);
5609
5610         return rc;
5611 }
5612
5613 /**
5614  * Handle orphans under the backend /lost+found directory
5615  *
5616  * Some backend checker, such as e2fsck for ldiskfs may find some orphans
5617  * and put them under the backend /lost+found directory that is invisible
5618  * to client. The LFSCK will scan such directory, for the original client
5619  * visible orphans, add their fids into the namespace LFSCK trace file,
5620  * then the subsenquent namespace LFSCK second-stage scanning can handle
5621  * them as other objects to be double scanned: either move back to normal
5622  * namespace, or to the global visible orphan directory:
5623  * /ROOT/.lustre/lost+found/MDTxxxx/
5624  *
5625  * \param[in] env       pointer to the thread context
5626  * \param[in] com       pointer to the lfsck component
5627  */
5628 static void lfsck_namespace_scan_local_lpf(const struct lu_env *env,
5629                                            struct lfsck_component *com)
5630 {
5631         struct lfsck_thread_info        *info   = lfsck_env_info(env);
5632         struct lu_dirent                *ent    =
5633                                         (struct lu_dirent *)info->lti_key;
5634         struct lu_seq_range             *range  = &info->lti_range;
5635         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5636         struct ptlrpc_thread            *thread = &lfsck->li_thread;
5637         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
5638         struct lfsck_namespace          *ns     = com->lc_file_ram;
5639         struct dt_object                *parent;
5640         const struct dt_it_ops          *iops;
5641         struct dt_it                    *di;
5642         struct seq_server_site          *ss     = lfsck_dev_site(lfsck);
5643         __u64                            cookie;
5644         __u32                            idx    = lfsck_dev_idx(lfsck);
5645         int                              rc     = 0;
5646         __u16                            type;
5647         ENTRY;
5648
5649         parent = lfsck_object_find_by_dev(env, lfsck->li_bottom,
5650                                           &LU_BACKEND_LPF_FID);
5651         if (IS_ERR(parent)) {
5652                 CERROR("%s: fail to find backend /lost+found: rc = %ld\n",
5653                        lfsck_lfsck2name(lfsck), PTR_ERR(parent));
5654                 RETURN_EXIT;
5655         }
5656
5657         /* It is normal that the /lost+found does not exist for ZFS backend. */
5658         if (!dt_object_exists(parent))
5659                 GOTO(out, rc = 0);
5660
5661         if (unlikely(!dt_try_as_dir(env, parent)))
5662                 GOTO(out, rc = -ENOTDIR);
5663
5664         CDEBUG(D_LFSCK, "%s: start to scan backend /lost+found\n",
5665                lfsck_lfsck2name(lfsck));
5666
5667         com->lc_new_scanned = 0;
5668         iops = &parent->do_index_ops->dio_it;
5669         di = iops->init(env, parent, LUDA_64BITHASH | LUDA_TYPE);
5670         if (IS_ERR(di))
5671                 GOTO(out, rc = PTR_ERR(di));
5672
5673         rc = iops->load(env, di, 0);
5674         if (rc == 0)
5675                 rc = iops->next(env, di);
5676         else if (rc > 0)
5677                 rc = 0;
5678
5679         while (rc == 0) {
5680                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY3, cfs_fail_val) &&
5681                     unlikely(!thread_is_running(thread)))
5682                         break;
5683
5684                 rc = iops->rec(env, di, (struct dt_rec *)ent,
5685                                LUDA_64BITHASH | LUDA_TYPE);
5686                 if (rc == 0)
5687                         rc = lfsck_unpack_ent(ent, &cookie, &type);
5688
5689                 if (unlikely(rc != 0)) {
5690                         CDEBUG(D_LFSCK, "%s: fail to iterate backend "
5691                                "/lost+found: rc = %d\n",
5692                                lfsck_lfsck2name(lfsck), rc);
5693
5694                         goto skip;
5695                 }
5696
5697                 /* skip dot and dotdot entries */
5698                 if (name_is_dot_or_dotdot(ent->lde_name, ent->lde_namelen))
5699                         goto next;
5700
5701                 if (!fid_seq_in_fldb(fid_seq(&ent->lde_fid)))
5702                         goto skip;
5703
5704                 if (fid_is_norm(&ent->lde_fid)) {
5705                         fld_range_set_mdt(range);
5706                         rc = fld_local_lookup(env, ss->ss_server_fld,
5707                                               fid_seq(&ent->lde_fid), range);
5708                         if (rc != 0)
5709                                 goto skip;
5710                 } else if (idx != 0) {
5711                         /* If the returned FID is IGIF, then there are three
5712                          * possible cases:
5713                          *
5714                          * 1) The object is upgraded from old Lustre-1.8 with
5715                          *    IGIF assigned to such object.
5716                          * 2) The object is a backend local object and is
5717                          *    invisible to client.
5718                          * 3) The object lost its LMV EA, and since there is
5719                          *    no FID-in-dirent for the orphan in the backend
5720                          *    /lost+found directory, then the low layer will
5721                          *    return IGIF for such object.
5722                          *
5723                          * For MDTx (x != 0), it is either case 2) or case 3),
5724                          * but from the LFSCK view, they are indistinguishable.
5725                          * To be safe, the LFSCK will keep it there and report
5726                          * some message, then the adminstrator can handle that
5727                          * furtherly.
5728                          *
5729                          * For MDT0, it is more possible the case 1). The LFSCK
5730                          * will handle the orphan as an upgraded object. */
5731                         CDEBUG(D_LFSCK, "%s: the orphan %.*s with IGIF "DFID
5732                                "in the backend /lost+found on the MDT %04x, "
5733                                "to be safe, skip it.\n",
5734                                lfsck_lfsck2name(lfsck), ent->lde_namelen,
5735                                ent->lde_name, PFID(&ent->lde_fid), idx);
5736                         goto skip;
5737                 }
5738
5739                 rc = lfsck_namespace_scan_local_lpf_one(env, com, parent, ent);
5740
5741 skip:
5742                 down_write(&com->lc_sem);
5743                 com->lc_new_scanned++;
5744                 ns->ln_local_lpf_scanned++;
5745                 if (rc > 0)
5746                         ns->ln_local_lpf_moved++;
5747                 else if (rc == 0)
5748                         ns->ln_local_lpf_skipped++;
5749                 else
5750                         ns->ln_local_lpf_failed++;
5751                 up_write(&com->lc_sem);
5752
5753                 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
5754                         break;
5755
5756 next:
5757                 lfsck_control_speed_by_self(com);
5758                 if (unlikely(!thread_is_running(thread))) {
5759                         rc = 0;
5760                         break;
5761                 }
5762
5763                 rc = iops->next(env, di);
5764         }
5765
5766         iops->put(env, di);
5767         iops->fini(env, di);
5768
5769         EXIT;
5770
5771 out:
5772         CDEBUG(D_LFSCK, "%s: stop to scan backend /lost+found: rc = %d\n",
5773                lfsck_lfsck2name(lfsck), rc);
5774
5775         lfsck_object_put(env, parent);
5776 }
5777
5778 /**
5779  * Rescan the striped directory after the master LMV EA reset.
5780  *
5781  * Sometimes, the master LMV EA of the striped directory maybe lost, so when
5782  * the namespace LFSCK engine scan the striped directory for the first time,
5783  * it will be regarded as a normal directory. As the LFSCK processing, some
5784  * other LFSCK instance on other MDT will find the shard of this striped dir,
5785  * and find that the master MDT-object of the striped directory lost its LMV
5786  * EA, then such remote LFSCK instance will regenerate the master LMV EA and
5787  * notify the LFSCK instance on this MDT to rescan the striped directory.
5788  *
5789  * \param[in] env       pointer to the thread context
5790  * \param[in] com       pointer to the lfsck component
5791  * \param[in] llu       the lfsck_lmv_unit that contains the striped directory
5792  *                      to be rescanned.
5793  *
5794  * \retval              positive number for success
5795  * \retval              0 for LFSCK stopped/paused
5796  * \retval              negative error number on failure
5797  */
5798 static int lfsck_namespace_rescan_striped_dir(const struct lu_env *env,
5799                                               struct lfsck_component *com,
5800                                               struct lfsck_lmv_unit *llu)
5801 {
5802         struct lfsck_thread_info        *info   = lfsck_env_info(env);
5803         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5804         struct lfsck_assistant_data     *lad    = com->lc_data;
5805         struct dt_object                *dir;
5806         const struct dt_it_ops          *iops;
5807         struct dt_it                    *di;
5808         struct lu_dirent                *ent    =
5809                         (struct lu_dirent *)info->lti_key;
5810         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
5811         struct ptlrpc_thread            *thread = &lfsck->li_thread;
5812         struct lfsck_namespace_req      *lnr;
5813         struct lfsck_assistant_req      *lar;
5814         int                              rc;
5815         __u16                            type;
5816         ENTRY;
5817
5818         LASSERT(list_empty(&lad->lad_req_list));
5819
5820         lfsck->li_lmv = &llu->llu_lmv;
5821         lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
5822         rc = lfsck_open_dir(env, lfsck, 0);
5823         if (rc != 0)
5824                 RETURN(rc);
5825
5826         dir = lfsck->li_obj_dir;
5827         di = lfsck->li_di_dir;
5828         iops = &dir->do_index_ops->dio_it;
5829         do {
5830                 rc = iops->rec(env, di, (struct dt_rec *)ent,
5831                                lfsck->li_args_dir);
5832                 if (rc == 0)
5833                         rc = lfsck_unpack_ent(ent, &lfsck->li_cookie_dir,
5834                                               &type);
5835
5836                 if (rc != 0) {
5837                         if (bk->lb_param & LPF_FAILOUT)
5838                                 GOTO(out, rc);
5839
5840                         goto next;
5841                 }
5842
5843                 if (name_is_dot_or_dotdot(ent->lde_name, ent->lde_namelen))
5844                         goto next;
5845
5846                 lnr = lfsck_namespace_assistant_req_init(lfsck, ent, type);
5847                 if (IS_ERR(lnr)) {
5848                         if (bk->lb_param & LPF_FAILOUT)
5849                                 GOTO(out, rc = PTR_ERR(lnr));
5850
5851                         goto next;
5852                 }
5853
5854                 lar = &lnr->lnr_lar;
5855                 rc = lfsck_namespace_assistant_handler_p1(env, com, lar);
5856                 lfsck_namespace_assistant_req_fini(env, lar);
5857                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
5858                         GOTO(out, rc);
5859
5860                 if (unlikely(!thread_is_running(thread)))
5861                         GOTO(out, rc = 0);
5862
5863 next:
5864                 rc = iops->next(env, di);
5865         } while (rc == 0);
5866
5867 out:
5868         lfsck_close_dir(env, lfsck, rc);
5869         if (rc <= 0)
5870                 RETURN(rc);
5871
5872         /* The close_dir() may insert a dummy lnr in the lad->lad_req_list. */
5873         if (list_empty(&lad->lad_req_list))
5874                 RETURN(1);
5875
5876         spin_lock(&lad->lad_lock);
5877         lar = list_entry(lad->lad_req_list.next, struct lfsck_assistant_req,
5878                           lar_list);
5879         list_del_init(&lar->lar_list);
5880         spin_unlock(&lad->lad_lock);
5881
5882         rc = lfsck_namespace_assistant_handler_p1(env, com, lar);
5883         lfsck_namespace_assistant_req_fini(env, lar);
5884
5885         RETURN(rc == 0 ? 1 : rc);
5886 }
5887
5888 static int
5889 lfsck_namespace_double_scan_one_trace_file(const struct lu_env *env,
5890                                            struct lfsck_component *com,
5891                                            struct dt_object *obj, bool first)
5892 {
5893         struct lfsck_instance   *lfsck  = com->lc_lfsck;
5894         struct ptlrpc_thread    *thread = &lfsck->li_thread;
5895         struct lfsck_bookmark   *bk     = &lfsck->li_bookmark_ram;
5896         struct lfsck_namespace  *ns     = com->lc_file_ram;
5897         const struct dt_it_ops  *iops   = &obj->do_index_ops->dio_it;
5898         struct dt_object        *target;
5899         struct dt_it            *di;
5900         struct dt_key           *key;
5901         struct lu_fid            fid;
5902         int                      rc;
5903         __u8                     flags  = 0;
5904         ENTRY;
5905
5906         di = iops->init(env, obj, 0);
5907         if (IS_ERR(di))
5908                 RETURN(PTR_ERR(di));
5909
5910         if (first)
5911                 fid_cpu_to_be(&fid, &ns->ln_fid_latest_scanned_phase2);
5912         else
5913                 fid_zero(&fid);
5914         rc = iops->get(env, di, (const struct dt_key *)&fid);
5915         if (rc < 0)
5916                 GOTO(fini, rc);
5917
5918         if (first) {
5919                 /* The start one either has been processed or does not exist,
5920                  * skip it. */
5921                 rc = iops->next(env, di);
5922                 if (rc != 0)
5923                         GOTO(put, rc);
5924         }
5925
5926         do {
5927                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY3, cfs_fail_val) &&
5928                     unlikely(!thread_is_running(thread)))
5929                         GOTO(put, rc = 0);
5930
5931                 key = iops->key(env, di);
5932                 if (IS_ERR(key)) {
5933                         rc = PTR_ERR(key);
5934                         if (rc == -ENOENT)
5935                                 GOTO(put, rc = 1);
5936
5937                         goto checkpoint;
5938                 }
5939
5940                 fid_be_to_cpu(&fid, (const struct lu_fid *)key);
5941                 if (!fid_is_sane(&fid)) {
5942                         rc = 0;
5943                         goto checkpoint;
5944                 }
5945
5946                 target = lfsck_object_find_bottom(env, lfsck, &fid);
5947                 if (IS_ERR(target)) {
5948                         rc = PTR_ERR(target);
5949                         goto checkpoint;
5950                 }
5951
5952                 if (dt_object_exists(target)) {
5953                         rc = iops->rec(env, di, (struct dt_rec *)&flags, 0);
5954                         if (rc == 0) {
5955                                 rc = lfsck_namespace_double_scan_one(env, com,
5956                                                                 target, flags);
5957                                 if (rc == -ENOENT)
5958                                         rc = 0;
5959                         }
5960                 }
5961
5962                 lfsck_object_put(env, target);
5963
5964 checkpoint:
5965                 down_write(&com->lc_sem);
5966                 com->lc_new_checked++;
5967                 com->lc_new_scanned++;
5968                 if (rc >= 0 && fid_is_sane(&fid))
5969                         ns->ln_fid_latest_scanned_phase2 = fid;
5970                 if (rc > 0)
5971                         ns->ln_objs_repaired_phase2++;
5972                 else if (rc < 0)
5973                         ns->ln_objs_failed_phase2++;
5974                 up_write(&com->lc_sem);
5975
5976                 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
5977                         GOTO(put, rc);
5978
5979                 if (unlikely(cfs_time_beforeq(com->lc_time_next_checkpoint,
5980                                               cfs_time_current())) &&
5981                     com->lc_new_checked != 0) {
5982                         down_write(&com->lc_sem);
5983                         ns->ln_run_time_phase2 +=
5984                                 cfs_duration_sec(cfs_time_current() +
5985                                 HALF_SEC - com->lc_time_last_checkpoint);
5986                         ns->ln_time_last_checkpoint = cfs_time_current_sec();
5987                         ns->ln_objs_checked_phase2 += com->lc_new_checked;
5988                         com->lc_new_checked = 0;
5989                         rc = lfsck_namespace_store(env, com, false);
5990                         up_write(&com->lc_sem);
5991                         if (rc != 0)
5992                                 GOTO(put, rc);
5993
5994                         com->lc_time_last_checkpoint = cfs_time_current();
5995                         com->lc_time_next_checkpoint =
5996                                 com->lc_time_last_checkpoint +
5997                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
5998                 }
5999
6000                 lfsck_control_speed_by_self(com);
6001                 if (unlikely(!thread_is_running(thread)))
6002                         GOTO(put, rc = 0);
6003
6004                 rc = iops->next(env, di);
6005         } while (rc == 0);
6006
6007         GOTO(put, rc);
6008
6009 put:
6010         iops->put(env, di);
6011
6012 fini:
6013         iops->fini(env, di);
6014
6015         return rc;
6016 }
6017
6018 static int lfsck_namespace_assistant_handler_p2(const struct lu_env *env,
6019                                                 struct lfsck_component *com)
6020 {
6021         struct lfsck_instance   *lfsck  = com->lc_lfsck;
6022         struct lfsck_namespace  *ns     = com->lc_file_ram;
6023         int                      rc;
6024         int                      i;
6025         ENTRY;
6026
6027         while (!list_empty(&lfsck->li_list_lmv)) {
6028                 struct lfsck_lmv_unit *llu;
6029
6030                 spin_lock(&lfsck->li_lock);
6031                 llu = list_entry(lfsck->li_list_lmv.next,
6032                                  struct lfsck_lmv_unit, llu_link);
6033                 list_del_init(&llu->llu_link);
6034                 spin_unlock(&lfsck->li_lock);
6035
6036                 rc = lfsck_namespace_rescan_striped_dir(env, com, llu);
6037                 if (rc <= 0)
6038                         RETURN(rc);
6039         }
6040
6041         CDEBUG(D_LFSCK, "%s: namespace LFSCK phase2 scan start\n",
6042                lfsck_lfsck2name(lfsck));
6043
6044         lfsck_namespace_scan_local_lpf(env, com);
6045
6046         com->lc_new_checked = 0;
6047         com->lc_new_scanned = 0;
6048         com->lc_time_last_checkpoint = cfs_time_current();
6049         com->lc_time_next_checkpoint = com->lc_time_last_checkpoint +
6050                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
6051
6052         i = lfsck_sub_trace_file_fid2idx(&ns->ln_fid_latest_scanned_phase2);
6053         rc = lfsck_namespace_double_scan_one_trace_file(env, com,
6054                                 com->lc_sub_trace_objs[i].lsto_obj, true);
6055         while (rc > 0 && ++i < LFSCK_STF_COUNT)
6056                 rc = lfsck_namespace_double_scan_one_trace_file(env, com,
6057                                 com->lc_sub_trace_objs[i].lsto_obj, false);
6058
6059         CDEBUG(D_LFSCK, "%s: namespace LFSCK phase2 scan stop at the No. %d "
6060                "trace file: rc = %d\n", lfsck_lfsck2name(lfsck), i, rc);
6061
6062         RETURN(rc);
6063 }
6064
6065 static void lfsck_namespace_assistant_fill_pos(const struct lu_env *env,
6066                                                struct lfsck_component *com,
6067                                                struct lfsck_position *pos)
6068 {
6069         struct lfsck_assistant_data     *lad = com->lc_data;
6070         struct lfsck_namespace_req      *lnr;
6071
6072         if (list_empty(&lad->lad_req_list))
6073                 return;
6074
6075         lnr = list_entry(lad->lad_req_list.next,
6076                          struct lfsck_namespace_req,
6077                          lnr_lar.lar_list);
6078         pos->lp_oit_cookie = lnr->lnr_oit_cookie;
6079         pos->lp_dir_cookie = lnr->lnr_dir_cookie - 1;
6080         pos->lp_dir_parent = lnr->lnr_lar.lar_fid;
6081 }
6082
6083 static int lfsck_namespace_double_scan_result(const struct lu_env *env,
6084                                               struct lfsck_component *com,
6085                                               int rc)
6086 {
6087         struct lfsck_instance   *lfsck  = com->lc_lfsck;
6088         struct lfsck_namespace  *ns     = com->lc_file_ram;
6089
6090         down_write(&com->lc_sem);
6091         ns->ln_run_time_phase2 += cfs_duration_sec(cfs_time_current() +
6092                                 HALF_SEC - lfsck->li_time_last_checkpoint);
6093         ns->ln_time_last_checkpoint = cfs_time_current_sec();
6094         ns->ln_objs_checked_phase2 += com->lc_new_checked;
6095         com->lc_new_checked = 0;
6096
6097         if (rc > 0) {
6098                 if (ns->ln_flags & LF_INCOMPLETE)
6099                         ns->ln_status = LS_PARTIAL;
6100                 else
6101                         ns->ln_status = LS_COMPLETED;
6102                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN))
6103                         ns->ln_flags &= ~(LF_SCANNED_ONCE | LF_INCONSISTENT);
6104                 ns->ln_time_last_complete = ns->ln_time_last_checkpoint;
6105                 ns->ln_success_count++;
6106         } else if (rc == 0) {
6107                 if (lfsck->li_status != 0)
6108                         ns->ln_status = lfsck->li_status;
6109                 else
6110                         ns->ln_status = LS_STOPPED;
6111         } else {
6112                 ns->ln_status = LS_FAILED;
6113         }
6114
6115         rc = lfsck_namespace_store(env, com, false);
6116         up_write(&com->lc_sem);
6117
6118         return rc;
6119 }
6120
6121 static int
6122 lfsck_namespace_assistant_sync_failures_interpret(const struct lu_env *env,
6123                                                   struct ptlrpc_request *req,
6124                                                   void *args, int rc)
6125 {
6126         if (rc == 0) {
6127                 struct lfsck_async_interpret_args *laia = args;
6128                 struct lfsck_tgt_desc             *ltd  = laia->laia_ltd;
6129
6130                 ltd->ltd_synced_failures = 1;
6131         }
6132
6133         return 0;
6134 }
6135
6136 /**
6137  * Notify remote LFSCK instances about former failures.
6138  *
6139  * The local LFSCK instance has recorded which MDTs have ever failed to respond
6140  * some LFSCK verification requests (maybe because of network issues or the MDT
6141  * itself trouble). During the respond gap the MDT may missed some name entries
6142  * verification, then the MDT cannot know whether related MDT-objects have been
6143  * referenced by related name entries or not, then in the second-stage scanning,
6144  * these MDT-objects will be regarded as orphan, if the MDT-object contains bad
6145  * linkEA for back reference, then it will misguide the LFSCK to generate wrong
6146  * name entry for repairing the orphan.
6147  *
6148  * To avoid above trouble, when layout LFSCK finishes the first-stage scanning,
6149  * it will scan the bitmap for the ever failed MDTs, and notify them that they
6150  * have ever missed some name entries verification and should skip the handling
6151  * for orphan MDT-objects.
6152  *
6153  * \param[in] env       pointer to the thread context
6154  * \param[in] com       pointer to the lfsck component
6155  * \param[in] lr        pointer to the lfsck request
6156  */
6157 static void lfsck_namespace_assistant_sync_failures(const struct lu_env *env,
6158                                                     struct lfsck_component *com,
6159                                                     struct lfsck_request *lr)
6160 {
6161         struct lfsck_async_interpret_args *laia  =
6162                                 &lfsck_env_info(env)->lti_laia2;
6163         struct lfsck_assistant_data       *lad   = com->lc_data;
6164         struct lfsck_namespace            *ns    = com->lc_file_ram;
6165         struct lfsck_instance             *lfsck = com->lc_lfsck;
6166         struct lfsck_tgt_descs            *ltds  = &lfsck->li_mdt_descs;
6167         struct lfsck_tgt_desc             *ltd;
6168         struct ptlrpc_request_set         *set;
6169         __u32                              idx;
6170         int                                rc    = 0;
6171         ENTRY;
6172
6173         if (!lad->lad_incomplete)
6174                 RETURN_EXIT;
6175
6176         set = ptlrpc_prep_set();
6177         if (set == NULL)
6178                 GOTO(out, rc = -ENOMEM);
6179
6180         lr->lr_flags2 = ns->ln_flags | LF_INCOMPLETE;
6181         memset(laia, 0, sizeof(*laia));
6182         lad->lad_touch_gen++;
6183
6184         down_read(&ltds->ltd_rw_sem);
6185         cfs_foreach_bit(lad->lad_bitmap, idx) {
6186                 ltd = LTD_TGT(ltds, idx);
6187                 LASSERT(ltd != NULL);
6188
6189                 laia->laia_ltd = ltd;
6190                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
6191                         lfsck_namespace_assistant_sync_failures_interpret,
6192                         laia, LFSCK_NOTIFY);
6193                 if (rc != 0)
6194                         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail "
6195                                "to sync failure with MDT %x: rc = %d\n",
6196                                lfsck_lfsck2name(lfsck), ltd->ltd_index, rc);
6197         }
6198         up_read(&ltds->ltd_rw_sem);
6199
6200         rc = ptlrpc_set_wait(set);
6201         ptlrpc_set_destroy(set);
6202
6203         GOTO(out, rc);
6204
6205 out:
6206         if (rc != 0)
6207                 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail "
6208                        "to sync failure with MDTs, and related MDTs "
6209                        "may handle orphan improperly: rc = %d\n",
6210                        lfsck_lfsck2name(lfsck), rc);
6211
6212         EXIT;
6213 }
6214
6215 struct lfsck_assistant_operations lfsck_namespace_assistant_ops = {
6216         .la_handler_p1          = lfsck_namespace_assistant_handler_p1,
6217         .la_handler_p2          = lfsck_namespace_assistant_handler_p2,
6218         .la_fill_pos            = lfsck_namespace_assistant_fill_pos,
6219         .la_double_scan_result  = lfsck_namespace_double_scan_result,
6220         .la_req_fini            = lfsck_namespace_assistant_req_fini,
6221         .la_sync_failures       = lfsck_namespace_assistant_sync_failures,
6222 };
6223
6224 /**
6225  * Verify the specified linkEA entry for the given directory object.
6226  * If the object has no such linkEA entry or it has more other linkEA
6227  * entries, then re-generate the linkEA with the given information.
6228  *
6229  * \param[in] env       pointer to the thread context
6230  * \param[in] obj       pointer to the dt_object to be handled
6231  * \param[in] cname     the name for the child in the parent directory
6232  * \param[in] pfid      the parent directory's FID for the linkEA
6233  *
6234  * \retval              0 for success
6235  * \retval              negative error number on failure
6236  */
6237 int lfsck_verify_linkea(const struct lu_env *env, struct dt_object *obj,
6238                         const struct lu_name *cname, const struct lu_fid *pfid)
6239 {
6240         struct dt_device        *dev    = lfsck_obj2dev(obj);
6241         struct linkea_data       ldata  = { NULL };
6242         struct lu_buf            linkea_buf;
6243         struct thandle          *th;
6244         int                      rc;
6245         int                      fl     = LU_XATTR_CREATE;
6246         bool                     dirty  = false;
6247         ENTRY;
6248
6249         LASSERT(S_ISDIR(lfsck_object_type(obj)));
6250
6251         rc = lfsck_links_read(env, obj, &ldata);
6252         if (rc == -ENODATA) {
6253                 dirty = true;
6254         } else if (rc == 0) {
6255                 fl = LU_XATTR_REPLACE;
6256                 if (ldata.ld_leh->leh_reccount != 1) {
6257                         dirty = true;
6258                 } else {
6259                         rc = linkea_links_find(&ldata, cname, pfid);
6260                         if (rc != 0)
6261                                 dirty = true;
6262                 }
6263         }
6264
6265         if (!dirty)
6266                 RETURN(rc);
6267
6268         rc = linkea_data_new(&ldata, &lfsck_env_info(env)->lti_linkea_buf);
6269         if (rc != 0)
6270                 RETURN(rc);
6271
6272         rc = linkea_add_buf(&ldata, cname, pfid);
6273         if (rc != 0)
6274                 RETURN(rc);
6275
6276         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
6277                        ldata.ld_leh->leh_len);
6278         th = dt_trans_create(env, dev);
6279         if (IS_ERR(th))
6280                 RETURN(PTR_ERR(th));
6281
6282         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
6283                                   XATTR_NAME_LINK, fl, th);
6284         if (rc != 0)
6285                 GOTO(stop, rc);
6286
6287         rc = dt_trans_start_local(env, dev, th);
6288         if (rc != 0)
6289                 GOTO(stop, rc);
6290
6291         dt_write_lock(env, obj, 0);
6292         rc = dt_xattr_set(env, obj, &linkea_buf,
6293                           XATTR_NAME_LINK, fl, th);
6294         dt_write_unlock(env, obj);
6295
6296         GOTO(stop, rc);
6297
6298 stop:
6299         dt_trans_stop(env, dev, th);
6300         return rc;
6301 }
6302
6303 /**
6304  * Get the name and parent directory's FID from the first linkEA entry.
6305  *
6306  * \param[in] env       pointer to the thread context
6307  * \param[in] obj       pointer to the object which get linkEA from
6308  * \param[out] name     pointer to the buffer to hold the name
6309  *                      in the first linkEA entry
6310  * \param[out] pfid     pointer to the buffer to hold the parent
6311  *                      directory's FID in the first linkEA entry
6312  *
6313  * \retval              0 for success
6314  * \retval              negative error number on failure
6315  */
6316 int lfsck_links_get_first(const struct lu_env *env, struct dt_object *obj,
6317                           char *name, struct lu_fid *pfid)
6318 {
6319         struct lu_name           *cname = &lfsck_env_info(env)->lti_name;
6320         struct linkea_data        ldata = { NULL };
6321         int                       rc;
6322
6323         rc = lfsck_links_read(env, obj, &ldata);
6324         if (rc != 0)
6325                 return rc;
6326
6327         linkea_first_entry(&ldata);
6328         if (ldata.ld_lee == NULL)
6329                 return -ENODATA;
6330
6331         linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen, cname, pfid);
6332         /* To guarantee the 'name' is terminated with '0'. */
6333         memcpy(name, cname->ln_name, cname->ln_namelen);
6334         name[cname->ln_namelen] = 0;
6335
6336         return 0;
6337 }
6338
6339 /**
6340  * Update the object's name entry with the given FID.
6341  *
6342  * \param[in] env       pointer to the thread context
6343  * \param[in] lfsck     pointer to the lfsck instance
6344  * \param[in] dir       pointer to the directory that holds
6345  *                      the name entry
6346  * \param[in] name      the name for the entry to be updated
6347  * \param[in] fid       the new FID for the name entry referenced
6348  * \param[in] type      the type for the name entry to be updated
6349  *
6350  * \retval              0 for success
6351  * \retval              negative error number on failure
6352  */
6353 int lfsck_update_name_entry(const struct lu_env *env,
6354                             struct lfsck_instance *lfsck,
6355                             struct dt_object *dir, const char *name,
6356                             const struct lu_fid *fid, __u32 type)
6357 {
6358         struct lfsck_thread_info *info   = lfsck_env_info(env);
6359         struct dt_insert_rec     *rec    = &info->lti_dt_rec;
6360         struct lfsck_lock_handle *llh    = &info->lti_llh;
6361         struct dt_device         *dev    = lfsck_obj2dev(dir);
6362         struct thandle           *th;
6363         int                       rc;
6364         bool                      exists = true;
6365         ENTRY;
6366
6367         rc = lfsck_lock(env, lfsck, dir, name, llh,
6368                         MDS_INODELOCK_UPDATE, LCK_PW);
6369         if (rc != 0)
6370                 RETURN(rc);
6371
6372         th = dt_trans_create(env, dev);
6373         if (IS_ERR(th))
6374                 GOTO(unlock, rc = PTR_ERR(th));
6375
6376         rc = dt_declare_delete(env, dir, (const struct dt_key *)name, th);
6377         if (rc != 0)
6378                 GOTO(stop, rc);
6379
6380         rec->rec_type = type;
6381         rec->rec_fid = fid;
6382         rc = dt_declare_insert(env, dir, (const struct dt_rec *)rec,
6383                                (const struct dt_key *)name, th);
6384         if (rc != 0)
6385                 GOTO(stop, rc);
6386
6387         rc = dt_declare_ref_add(env, dir, th);
6388         if (rc != 0)
6389                 GOTO(stop, rc);
6390
6391         rc = dt_trans_start_local(env, dev, th);
6392         if (rc != 0)
6393                 GOTO(stop, rc);
6394
6395         rc = dt_delete(env, dir, (const struct dt_key *)name, th);
6396         if (rc == -ENOENT) {
6397                 exists = false;
6398                 rc = 0;
6399         }
6400
6401         if (rc != 0)
6402                 GOTO(stop, rc);
6403
6404         rc = dt_insert(env, dir, (const struct dt_rec *)rec,
6405                        (const struct dt_key *)name, th, 1);
6406         if (rc == 0 && S_ISDIR(type) && !exists) {
6407                 dt_write_lock(env, dir, 0);
6408                 rc = dt_ref_add(env, dir, th);
6409                 dt_write_unlock(env, dir);
6410         }
6411
6412         GOTO(stop, rc);
6413
6414 stop:
6415         dt_trans_stop(env, dev, th);
6416
6417 unlock:
6418         lfsck_unlock(llh);
6419         CDEBUG(D_LFSCK, "%s: update name entry "DFID"/%s with the FID "DFID
6420                " and the type %o: rc = %d\n", lfsck_lfsck2name(lfsck),
6421                PFID(lfsck_dto2fid(dir)), name, PFID(fid), type, rc);
6422
6423         return rc;
6424 }
6425
6426 int lfsck_namespace_setup(const struct lu_env *env,
6427                           struct lfsck_instance *lfsck)
6428 {
6429         struct lfsck_component  *com;
6430         struct lfsck_namespace  *ns;
6431         struct dt_object        *root = NULL;
6432         struct dt_object        *obj;
6433         int                      i;
6434         int                      rc;
6435         ENTRY;
6436
6437         LASSERT(lfsck->li_master);
6438
6439         OBD_ALLOC_PTR(com);
6440         if (com == NULL)
6441                 RETURN(-ENOMEM);
6442
6443         INIT_LIST_HEAD(&com->lc_link);
6444         INIT_LIST_HEAD(&com->lc_link_dir);
6445         init_rwsem(&com->lc_sem);
6446         atomic_set(&com->lc_ref, 1);
6447         com->lc_lfsck = lfsck;
6448         com->lc_type = LFSCK_TYPE_NAMESPACE;
6449         com->lc_ops = &lfsck_namespace_ops;
6450         com->lc_data = lfsck_assistant_data_init(
6451                         &lfsck_namespace_assistant_ops,
6452                         LFSCK_NAMESPACE);
6453         if (com->lc_data == NULL)
6454                 GOTO(out, rc = -ENOMEM);
6455
6456         com->lc_file_size = sizeof(struct lfsck_namespace);
6457         OBD_ALLOC(com->lc_file_ram, com->lc_file_size);
6458         if (com->lc_file_ram == NULL)
6459                 GOTO(out, rc = -ENOMEM);
6460
6461         OBD_ALLOC(com->lc_file_disk, com->lc_file_size);
6462         if (com->lc_file_disk == NULL)
6463                 GOTO(out, rc = -ENOMEM);
6464
6465         for (i = 0; i < LFSCK_STF_COUNT; i++)
6466                 mutex_init(&com->lc_sub_trace_objs[i].lsto_mutex);
6467
6468         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
6469         if (IS_ERR(root))
6470                 GOTO(out, rc = PTR_ERR(root));
6471
6472         if (unlikely(!dt_try_as_dir(env, root)))
6473                 GOTO(out, rc = -ENOTDIR);
6474
6475         obj = local_index_find_or_create(env, lfsck->li_los, root,
6476                                          LFSCK_NAMESPACE,
6477                                          S_IFREG | S_IRUGO | S_IWUSR,
6478                                          &dt_lfsck_features);
6479         if (IS_ERR(obj))
6480                 GOTO(out, rc = PTR_ERR(obj));
6481
6482         com->lc_obj = obj;
6483         rc = lfsck_namespace_load(env, com);
6484         if (rc == -ENODATA)
6485                 rc = lfsck_namespace_init(env, com);
6486         else if (rc < 0)
6487                 rc = lfsck_namespace_reset(env, com, true);
6488         else
6489                 rc = lfsck_namespace_load_sub_trace_files(env, com, false);
6490         if (rc != 0)
6491                 GOTO(out, rc);
6492
6493         ns = com->lc_file_ram;
6494         switch (ns->ln_status) {
6495         case LS_INIT:
6496         case LS_COMPLETED:
6497         case LS_FAILED:
6498         case LS_STOPPED:
6499                 spin_lock(&lfsck->li_lock);
6500                 list_add_tail(&com->lc_link, &lfsck->li_list_idle);
6501                 spin_unlock(&lfsck->li_lock);
6502                 break;
6503         default:
6504                 CERROR("%s: unknown lfsck_namespace status %d\n",
6505                        lfsck_lfsck2name(lfsck), ns->ln_status);
6506                 /* fall through */
6507         case LS_SCANNING_PHASE1:
6508         case LS_SCANNING_PHASE2:
6509                 /* No need to store the status to disk right now.
6510                  * If the system crashed before the status stored,
6511                  * it will be loaded back when next time. */
6512                 ns->ln_status = LS_CRASHED;
6513                 /* fall through */
6514         case LS_PAUSED:
6515         case LS_CRASHED:
6516                 spin_lock(&lfsck->li_lock);
6517                 list_add_tail(&com->lc_link, &lfsck->li_list_scan);
6518                 list_add_tail(&com->lc_link_dir, &lfsck->li_list_dir);
6519                 spin_unlock(&lfsck->li_lock);
6520                 break;
6521         }
6522
6523         GOTO(out, rc = 0);
6524
6525 out:
6526         if (root != NULL && !IS_ERR(root))
6527                 lfsck_object_put(env, root);
6528         if (rc != 0) {
6529                 lfsck_component_cleanup(env, com);
6530                 CERROR("%s: fail to init namespace LFSCK component: rc = %d\n",
6531                        lfsck_lfsck2name(lfsck), rc);
6532         }
6533         return rc;
6534 }