lustre/lfsck/lfsck_namespace.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.  A copy is
  14  * included in the COPYING file that accompanied this code.
  15
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2013, 2017, Intel Corporation.
  24  */
  25 /*
  26  * lustre/lfsck/lfsck_namespace.c
  27  *
  28  * Author: Fan, Yong <fan.yong@intel.com>
  29  */
  30
  31 #define DEBUG_SUBSYSTEM S_LFSCK
  32
  33 #include <lu_object.h>
  34 #include <dt_object.h>
  35 #include <md_object.h>
  36 #include <lustre_fid.h>
  37 #include <lustre_lib.h>
  38 #include <lustre_net.h>
  39
  40 #include "lfsck_internal.h"
  41
  42 #define LFSCK_NAMESPACE_MAGIC_V1        0xA0629D03
  43 #define LFSCK_NAMESPACE_MAGIC_V2        0xA0621A0B
  44 #define LFSCK_NAMESPACE_MAGIC_V3        0xA06249FF
  45
  46 /* For Lustre-2.x (x <= 6), the namespace LFSCK used LFSCK_NAMESPACE_MAGIC_V1
  47  * as the trace file magic. When downgrade to such old release, the old LFSCK
  48  * will not recognize the new LFSCK_NAMESPACE_MAGIC_V2 in the new trace file,
  49  * then it will reset the whole LFSCK, and will not cause start failure. The
  50  * similar case will happen when upgrade from such old release. */
  51 #define LFSCK_NAMESPACE_MAGIC           LFSCK_NAMESPACE_MAGIC_V3
  52
  53 enum lfsck_nameentry_check {
  54         LFSCK_NAMEENTRY_DEAD            = 1, /* The object has been unlinked. */
  55         LFSCK_NAMEENTRY_REMOVED         = 2, /* The entry has been removed. */
  56         LFSCK_NAMEENTRY_RECREATED       = 3, /* The entry has been recreated. */
  57 };
  58
  59 static struct lfsck_namespace_req *
  60 lfsck_namespace_assistant_req_init(struct lfsck_instance *lfsck,
  61                                    struct lfsck_assistant_object *lso,
  62                                    struct lu_dirent *ent, __u16 type)
  63 {
  64         struct lfsck_namespace_req *lnr;
  65         int                         size;
  66
  67         size = sizeof(*lnr) + (ent->lde_namelen & ~3) + 4;
  68         OBD_ALLOC(lnr, size);
  69         if (lnr == NULL)
  70                 return ERR_PTR(-ENOMEM);
  71
  72         INIT_LIST_HEAD(&lnr->lnr_lar.lar_list);
  73         lnr->lnr_lar.lar_parent = lfsck_assistant_object_get(lso);
  74         lnr->lnr_lmv = lfsck_lmv_get(lfsck->li_lmv);
  75         lnr->lnr_fid = ent->lde_fid;
  76         lnr->lnr_dir_cookie = ent->lde_hash;
  77         lnr->lnr_attr = ent->lde_attrs;
  78         lnr->lnr_size = size;
  79         lnr->lnr_type = type;
  80         lnr->lnr_namelen = ent->lde_namelen;
  81         memcpy(lnr->lnr_name, ent->lde_name, ent->lde_namelen);
  82
  83         return lnr;
  84 }
  85
  86 static void lfsck_namespace_assistant_req_fini(const struct lu_env *env,
  87                                                struct lfsck_assistant_req *lar)
  88 {
  89         struct lfsck_namespace_req *lnr =
  90                         container_of0(lar, struct lfsck_namespace_req, lnr_lar);
  91
  92         if (lnr->lnr_lmv != NULL)
  93                 lfsck_lmv_put(env, lnr->lnr_lmv);
  94
  95         lfsck_assistant_object_put(env, lar->lar_parent);
  96         OBD_FREE(lnr, lnr->lnr_size);
  97 }
  98
  99 static void lfsck_namespace_le_to_cpu(struct lfsck_namespace *dst,
 100                                       struct lfsck_namespace *src)
 101 {
 102         dst->ln_magic = le32_to_cpu(src->ln_magic);
 103         dst->ln_status = le32_to_cpu(src->ln_status);
 104         dst->ln_flags = le32_to_cpu(src->ln_flags);
 105         dst->ln_success_count = le32_to_cpu(src->ln_success_count);
 106         dst->ln_run_time_phase1 = le64_to_cpu(src->ln_run_time_phase1);
 107         dst->ln_run_time_phase2 = le64_to_cpu(src->ln_run_time_phase2);
 108         dst->ln_time_last_complete = le64_to_cpu(src->ln_time_last_complete);
 109         dst->ln_time_latest_start = le64_to_cpu(src->ln_time_latest_start);
 110         dst->ln_time_last_checkpoint =
 111                                 le64_to_cpu(src->ln_time_last_checkpoint);
 112         lfsck_position_le_to_cpu(&dst->ln_pos_latest_start,
 113                                  &src->ln_pos_latest_start);
 114         lfsck_position_le_to_cpu(&dst->ln_pos_last_checkpoint,
 115                                  &src->ln_pos_last_checkpoint);
 116         lfsck_position_le_to_cpu(&dst->ln_pos_first_inconsistent,
 117                                  &src->ln_pos_first_inconsistent);
 118         dst->ln_items_checked = le64_to_cpu(src->ln_items_checked);
 119         dst->ln_items_repaired = le64_to_cpu(src->ln_items_repaired);
 120         dst->ln_items_failed = le64_to_cpu(src->ln_items_failed);
 121         dst->ln_dirs_checked = le64_to_cpu(src->ln_dirs_checked);
 122         dst->ln_objs_checked_phase2 = le64_to_cpu(src->ln_objs_checked_phase2);
 123         dst->ln_objs_repaired_phase2 =
 124                                 le64_to_cpu(src->ln_objs_repaired_phase2);
 125         dst->ln_objs_failed_phase2 = le64_to_cpu(src->ln_objs_failed_phase2);
 126         dst->ln_objs_nlink_repaired = le64_to_cpu(src->ln_objs_nlink_repaired);
 127         fid_le_to_cpu(&dst->ln_fid_latest_scanned_phase2,
 128                       &src->ln_fid_latest_scanned_phase2);
 129         dst->ln_dirent_repaired = le64_to_cpu(src->ln_dirent_repaired);
 130         dst->ln_linkea_repaired = le64_to_cpu(src->ln_linkea_repaired);
 131         dst->ln_mul_linked_checked = le64_to_cpu(src->ln_mul_linked_checked);
 132         dst->ln_mul_linked_repaired = le64_to_cpu(src->ln_mul_linked_repaired);
 133         dst->ln_unknown_inconsistency =
 134                                 le64_to_cpu(src->ln_unknown_inconsistency);
 135         dst->ln_unmatched_pairs_repaired =
 136                                 le64_to_cpu(src->ln_unmatched_pairs_repaired);
 137         dst->ln_dangling_repaired = le64_to_cpu(src->ln_dangling_repaired);
 138         dst->ln_mul_ref_repaired = le64_to_cpu(src->ln_mul_ref_repaired);
 139         dst->ln_bad_type_repaired = le64_to_cpu(src->ln_bad_type_repaired);
 140         dst->ln_lost_dirent_repaired =
 141                                 le64_to_cpu(src->ln_lost_dirent_repaired);
 142         dst->ln_striped_dirs_scanned =
 143                                 le64_to_cpu(src->ln_striped_dirs_scanned);
 144         dst->ln_striped_dirs_repaired =
 145                                 le64_to_cpu(src->ln_striped_dirs_repaired);
 146         dst->ln_striped_dirs_failed =
 147                                 le64_to_cpu(src->ln_striped_dirs_failed);
 148         dst->ln_striped_dirs_disabled =
 149                                 le64_to_cpu(src->ln_striped_dirs_disabled);
 150         dst->ln_striped_dirs_skipped =
 151                                 le64_to_cpu(src->ln_striped_dirs_skipped);
 152         dst->ln_striped_shards_scanned =
 153                                 le64_to_cpu(src->ln_striped_shards_scanned);
 154         dst->ln_striped_shards_repaired =
 155                                 le64_to_cpu(src->ln_striped_shards_repaired);
 156         dst->ln_striped_shards_failed =
 157                                 le64_to_cpu(src->ln_striped_shards_failed);
 158         dst->ln_striped_shards_skipped =
 159                                 le64_to_cpu(src->ln_striped_shards_skipped);
 160         dst->ln_name_hash_repaired = le64_to_cpu(src->ln_name_hash_repaired);
 161         dst->ln_local_lpf_scanned = le64_to_cpu(src->ln_local_lpf_scanned);
 162         dst->ln_local_lpf_moved = le64_to_cpu(src->ln_local_lpf_moved);
 163         dst->ln_local_lpf_skipped = le64_to_cpu(src->ln_local_lpf_skipped);
 164         dst->ln_local_lpf_failed = le64_to_cpu(src->ln_local_lpf_failed);
 165         dst->ln_bitmap_size = le32_to_cpu(src->ln_bitmap_size);
 166         dst->ln_time_latest_reset = le64_to_cpu(src->ln_time_latest_reset);
 167         dst->ln_linkea_overflow_cleared =
 168                                 le64_to_cpu(src->ln_linkea_overflow_cleared);
 169         dst->ln_agent_entries_repaired =
 170                                 le64_to_cpu(src->ln_agent_entries_repaired);
 171 }
 172
 173 static void lfsck_namespace_cpu_to_le(struct lfsck_namespace *dst,
 174                                       struct lfsck_namespace *src)
 175 {
 176         dst->ln_magic = cpu_to_le32(src->ln_magic);
 177         dst->ln_status = cpu_to_le32(src->ln_status);
 178         dst->ln_flags = cpu_to_le32(src->ln_flags);
 179         dst->ln_success_count = cpu_to_le32(src->ln_success_count);
 180         dst->ln_run_time_phase1 = cpu_to_le64(src->ln_run_time_phase1);
 181         dst->ln_run_time_phase2 = cpu_to_le64(src->ln_run_time_phase2);
 182         dst->ln_time_last_complete = cpu_to_le64(src->ln_time_last_complete);
 183         dst->ln_time_latest_start = cpu_to_le64(src->ln_time_latest_start);
 184         dst->ln_time_last_checkpoint =
 185                                 cpu_to_le64(src->ln_time_last_checkpoint);
 186         lfsck_position_cpu_to_le(&dst->ln_pos_latest_start,
 187                                  &src->ln_pos_latest_start);
 188         lfsck_position_cpu_to_le(&dst->ln_pos_last_checkpoint,
 189                                  &src->ln_pos_last_checkpoint);
 190         lfsck_position_cpu_to_le(&dst->ln_pos_first_inconsistent,
 191                                  &src->ln_pos_first_inconsistent);
 192         dst->ln_items_checked = cpu_to_le64(src->ln_items_checked);
 193         dst->ln_items_repaired = cpu_to_le64(src->ln_items_repaired);
 194         dst->ln_items_failed = cpu_to_le64(src->ln_items_failed);
 195         dst->ln_dirs_checked = cpu_to_le64(src->ln_dirs_checked);
 196         dst->ln_objs_checked_phase2 = cpu_to_le64(src->ln_objs_checked_phase2);
 197         dst->ln_objs_repaired_phase2 =
 198                                 cpu_to_le64(src->ln_objs_repaired_phase2);
 199         dst->ln_objs_failed_phase2 = cpu_to_le64(src->ln_objs_failed_phase2);
 200         dst->ln_objs_nlink_repaired = cpu_to_le64(src->ln_objs_nlink_repaired);
 201         fid_cpu_to_le(&dst->ln_fid_latest_scanned_phase2,
 202                       &src->ln_fid_latest_scanned_phase2);
 203         dst->ln_dirent_repaired = cpu_to_le64(src->ln_dirent_repaired);
 204         dst->ln_linkea_repaired = cpu_to_le64(src->ln_linkea_repaired);
 205         dst->ln_mul_linked_checked = cpu_to_le64(src->ln_mul_linked_checked);
 206         dst->ln_mul_linked_repaired = cpu_to_le64(src->ln_mul_linked_repaired);
 207         dst->ln_unknown_inconsistency =
 208                                 cpu_to_le64(src->ln_unknown_inconsistency);
 209         dst->ln_unmatched_pairs_repaired =
 210                                 cpu_to_le64(src->ln_unmatched_pairs_repaired);
 211         dst->ln_dangling_repaired = cpu_to_le64(src->ln_dangling_repaired);
 212         dst->ln_mul_ref_repaired = cpu_to_le64(src->ln_mul_ref_repaired);
 213         dst->ln_bad_type_repaired = cpu_to_le64(src->ln_bad_type_repaired);
 214         dst->ln_lost_dirent_repaired =
 215                                 cpu_to_le64(src->ln_lost_dirent_repaired);
 216         dst->ln_striped_dirs_scanned =
 217                                 cpu_to_le64(src->ln_striped_dirs_scanned);
 218         dst->ln_striped_dirs_repaired =
 219                                 cpu_to_le64(src->ln_striped_dirs_repaired);
 220         dst->ln_striped_dirs_failed =
 221                                 cpu_to_le64(src->ln_striped_dirs_failed);
 222         dst->ln_striped_dirs_disabled =
 223                                 cpu_to_le64(src->ln_striped_dirs_disabled);
 224         dst->ln_striped_dirs_skipped =
 225                                 cpu_to_le64(src->ln_striped_dirs_skipped);
 226         dst->ln_striped_shards_scanned =
 227                                 cpu_to_le64(src->ln_striped_shards_scanned);
 228         dst->ln_striped_shards_repaired =
 229                                 cpu_to_le64(src->ln_striped_shards_repaired);
 230         dst->ln_striped_shards_failed =
 231                                 cpu_to_le64(src->ln_striped_shards_failed);
 232         dst->ln_striped_shards_skipped =
 233                                 cpu_to_le64(src->ln_striped_shards_skipped);
 234         dst->ln_name_hash_repaired = cpu_to_le64(src->ln_name_hash_repaired);
 235         dst->ln_local_lpf_scanned = cpu_to_le64(src->ln_local_lpf_scanned);
 236         dst->ln_local_lpf_moved = cpu_to_le64(src->ln_local_lpf_moved);
 237         dst->ln_local_lpf_skipped = cpu_to_le64(src->ln_local_lpf_skipped);
 238         dst->ln_local_lpf_failed = cpu_to_le64(src->ln_local_lpf_failed);
 239         dst->ln_bitmap_size = cpu_to_le32(src->ln_bitmap_size);
 240         dst->ln_time_latest_reset = cpu_to_le64(src->ln_time_latest_reset);
 241         dst->ln_linkea_overflow_cleared =
 242                                 cpu_to_le64(src->ln_linkea_overflow_cleared);
 243         dst->ln_agent_entries_repaired =
 244                                 cpu_to_le64(src->ln_agent_entries_repaired);
 245 }
 246
 247 static void lfsck_namespace_record_failure(const struct lu_env *env,
 248                                            struct lfsck_instance *lfsck,
 249                                            struct lfsck_namespace *ns)
 250 {
 251         struct lfsck_position pos;
 252
 253         ns->ln_items_failed++;
 254         lfsck_pos_fill(env, lfsck, &pos, false);
 255         if (lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent) ||
 256             lfsck_pos_is_eq(&pos, &ns->ln_pos_first_inconsistent) < 0) {
 257                 ns->ln_pos_first_inconsistent = pos;
 258
 259                 CDEBUG(D_LFSCK, "%s: namespace LFSCK hit first non-repaired "
 260                        "inconsistency at the pos [%llu, "DFID", %#llx]\n",
 261                        lfsck_lfsck2name(lfsck),
 262                        ns->ln_pos_first_inconsistent.lp_oit_cookie,
 263                        PFID(&ns->ln_pos_first_inconsistent.lp_dir_parent),
 264                        ns->ln_pos_first_inconsistent.lp_dir_cookie);
 265         }
 266 }
 267
 268 /**
 269  * Load the MDT bitmap from the lfsck_namespace trace file.
 270  *
 271  * \param[in] env       pointer to the thread context
 272  * \param[in] com       pointer to the lfsck component
 273  *
 274  * \retval              0 for success
 275  * \retval              negative error number on failure or data corruption
 276  */
 277 static int lfsck_namespace_load_bitmap(const struct lu_env *env,
 278                                        struct lfsck_component *com)
 279 {
 280         struct dt_object                *obj    = com->lc_obj;
 281         struct lfsck_assistant_data     *lad    = com->lc_data;
 282         struct lfsck_namespace          *ns     = com->lc_file_ram;
 283         struct cfs_bitmap                       *bitmap = lad->lad_bitmap;
 284         ssize_t                          size;
 285         __u32                            nbits;
 286         int                              rc;
 287         ENTRY;
 288
 289         if (com->lc_lfsck->li_mdt_descs.ltd_tgts_bitmap->size >
 290             ns->ln_bitmap_size)
 291                 nbits = com->lc_lfsck->li_mdt_descs.ltd_tgts_bitmap->size;
 292         else
 293                 nbits = ns->ln_bitmap_size;
 294
 295         if (unlikely(nbits < BITS_PER_LONG))
 296                 nbits = BITS_PER_LONG;
 297
 298         if (nbits > bitmap->size) {
 299                 __u32 new_bits = bitmap->size;
 300                 struct cfs_bitmap *new_bitmap;
 301
 302                 while (new_bits < nbits)
 303                         new_bits <<= 1;
 304
 305                 new_bitmap = CFS_ALLOCATE_BITMAP(new_bits);
 306                 if (new_bitmap == NULL)
 307                         RETURN(-ENOMEM);
 308
 309                 lad->lad_bitmap = new_bitmap;
 310                 CFS_FREE_BITMAP(bitmap);
 311                 bitmap = new_bitmap;
 312         }
 313
 314         if (ns->ln_bitmap_size == 0) {
 315                 clear_bit(LAD_INCOMPLETE, &lad->lad_flags);
 316                 CFS_RESET_BITMAP(bitmap);
 317
 318                 RETURN(0);
 319         }
 320
 321         size = (ns->ln_bitmap_size + 7) >> 3;
 322         rc = dt_xattr_get(env, obj,
 323                           lfsck_buf_get(env, bitmap->data, size),
 324                           XATTR_NAME_LFSCK_BITMAP);
 325         if (rc != size)
 326                 RETURN(rc >= 0 ? -EINVAL : rc);
 327
 328         if (cfs_bitmap_check_empty(bitmap))
 329                 clear_bit(LAD_INCOMPLETE, &lad->lad_flags);
 330         else
 331                 set_bit(LAD_INCOMPLETE, &lad->lad_flags);
 332
 333         RETURN(0);
 334 }
 335
 336 /**
 337  * Load namespace LFSCK statistics information from the trace file.
 338  *
 339  * \param[in] env       pointer to the thread context
 340  * \param[in] com       pointer to the lfsck component
 341  *
 342  * \retval              0 for success
 343  * \retval              negative error number on failure
 344  */
 345 static int lfsck_namespace_load(const struct lu_env *env,
 346                                 struct lfsck_component *com)
 347 {
 348         int len = com->lc_file_size;
 349         int rc;
 350
 351         rc = dt_xattr_get(env, com->lc_obj,
 352                           lfsck_buf_get(env, com->lc_file_disk, len),
 353                           XATTR_NAME_LFSCK_NAMESPACE);
 354         if (rc == len) {
 355                 struct lfsck_namespace *ns = com->lc_file_ram;
 356
 357                 lfsck_namespace_le_to_cpu(ns,
 358                                 (struct lfsck_namespace *)com->lc_file_disk);
 359                 if (ns->ln_magic != LFSCK_NAMESPACE_MAGIC) {
 360                         CDEBUG(D_LFSCK, "%s: invalid lfsck_namespace magic "
 361                                "%#x != %#x\n", lfsck_lfsck2name(com->lc_lfsck),
 362                                ns->ln_magic, LFSCK_NAMESPACE_MAGIC);
 363                         rc = -ESTALE;
 364                 } else {
 365                         rc = 0;
 366                 }
 367         } else if (rc != -ENODATA) {
 368                 CDEBUG(D_LFSCK, "%s: fail to load lfsck_namespace, "
 369                        "expected = %d: rc = %d\n",
 370                        lfsck_lfsck2name(com->lc_lfsck), len, rc);
 371                 if (rc >= 0)
 372                         rc = -ESTALE;
 373         }
 374
 375         return rc;
 376 }
 377
 378 static int lfsck_namespace_store(const struct lu_env *env,
 379                                  struct lfsck_component *com)
 380 {
 381         struct dt_object                *obj    = com->lc_obj;
 382         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 383         struct lfsck_namespace          *ns     = com->lc_file_ram;
 384         struct lfsck_assistant_data     *lad    = com->lc_data;
 385         struct dt_device                *dev    = lfsck_obj2dev(obj);
 386         struct cfs_bitmap               *bitmap = NULL;
 387         struct thandle                  *handle;
 388         __u32                            nbits  = 0;
 389         int                              len    = com->lc_file_size;
 390         int                              rc;
 391         ENTRY;
 392
 393         if (lad != NULL) {
 394                 bitmap = lad->lad_bitmap;
 395                 nbits = bitmap->size;
 396
 397                 LASSERT(nbits > 0);
 398                 LASSERTF((nbits & 7) == 0, "Invalid nbits %u\n", nbits);
 399         }
 400
 401         ns->ln_bitmap_size = nbits;
 402         lfsck_namespace_cpu_to_le((struct lfsck_namespace *)com->lc_file_disk,
 403                                   ns);
 404         handle = dt_trans_create(env, dev);
 405         if (IS_ERR(handle))
 406                 GOTO(log, rc = PTR_ERR(handle));
 407
 408         rc = dt_declare_xattr_set(env, obj,
 409                                   lfsck_buf_get(env, com->lc_file_disk, len),
 410                                   XATTR_NAME_LFSCK_NAMESPACE, 0, handle);
 411         if (rc != 0)
 412                 GOTO(out, rc);
 413
 414         if (bitmap != NULL) {
 415                 rc = dt_declare_xattr_set(env, obj,
 416                                 lfsck_buf_get(env, bitmap->data, nbits >> 3),
 417                                 XATTR_NAME_LFSCK_BITMAP, 0, handle);
 418                 if (rc != 0)
 419                         GOTO(out, rc);
 420         }
 421
 422         rc = dt_trans_start_local(env, dev, handle);
 423         if (rc != 0)
 424                 GOTO(out, rc);
 425
 426         rc = dt_xattr_set(env, obj,
 427                           lfsck_buf_get(env, com->lc_file_disk, len),
 428                           XATTR_NAME_LFSCK_NAMESPACE, 0, handle);
 429         if (rc == 0 && bitmap != NULL)
 430                 rc = dt_xattr_set(env, obj,
 431                                   lfsck_buf_get(env, bitmap->data, nbits >> 3),
 432                                   XATTR_NAME_LFSCK_BITMAP, 0, handle);
 433
 434         GOTO(out, rc);
 435
 436 out:
 437         dt_trans_stop(env, dev, handle);
 438
 439 log:
 440         if (rc != 0)
 441                 CDEBUG(D_LFSCK, "%s: fail to store lfsck_namespace: rc = %d\n",
 442                        lfsck_lfsck2name(lfsck), rc);
 443         return rc;
 444 }
 445
 446 static int lfsck_namespace_init(const struct lu_env *env,
 447                                 struct lfsck_component *com)
 448 {
 449         struct lfsck_namespace *ns = com->lc_file_ram;
 450         int rc;
 451
 452         memset(ns, 0, sizeof(*ns));
 453         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
 454         ns->ln_status = LS_INIT;
 455         ns->ln_time_latest_reset = ktime_get_real_seconds();
 456         down_write(&com->lc_sem);
 457         rc = lfsck_namespace_store(env, com);
 458         if (rc == 0)
 459                 rc = lfsck_load_sub_trace_files(env, com,
 460                         &dt_lfsck_namespace_features, LFSCK_NAMESPACE, true);
 461         up_write(&com->lc_sem);
 462
 463         return rc;
 464 }
 465
 466 /**
 467  * Update the namespace LFSCK trace file for the given @fid
 468  *
 469  * \param[in] env       pointer to the thread context
 470  * \param[in] com       pointer to the lfsck component
 471  * \param[in] fid       the fid which flags to be updated in the lfsck
 472  *                      trace file
 473  * \param[in] add       true if add new flags, otherwise remove flags
 474  *
 475  * \retval              0 for success or nothing to be done
 476  * \retval              negative error number on failure
 477  */
 478 int lfsck_namespace_trace_update(const struct lu_env *env,
 479                                  struct lfsck_component *com,
 480                                  const struct lu_fid *fid,
 481                                  const __u8 flags, bool add)
 482 {
 483         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 484         struct dt_object        *obj;
 485         struct lu_fid           *key    = &lfsck_env_info(env)->lti_fid3;
 486         struct dt_device        *dev;
 487         struct thandle          *th     = NULL;
 488         int                      idx;
 489         int                      rc     = 0;
 490         __u8                     old    = 0;
 491         __u8                     new    = 0;
 492         ENTRY;
 493
 494         LASSERT(flags != 0);
 495
 496         if (unlikely(!fid_is_sane(fid)))
 497                 RETURN(0);
 498
 499         idx = lfsck_sub_trace_file_fid2idx(fid);
 500         mutex_lock(&com->lc_sub_trace_objs[idx].lsto_mutex);
 501         obj = com->lc_sub_trace_objs[idx].lsto_obj;
 502         if (unlikely(obj == NULL)) {
 503                 mutex_unlock(&com->lc_sub_trace_objs[idx].lsto_mutex);
 504                 RETURN(0);
 505         }
 506
 507         lfsck_object_get(obj);
 508         dev = lfsck_obj2dev(obj);
 509         fid_cpu_to_be(key, fid);
 510         rc = dt_lookup(env, obj, (struct dt_rec *)&old,
 511                        (const struct dt_key *)key);
 512         if (rc == -ENOENT) {
 513                 if (!add)
 514                         GOTO(unlock, rc = 0);
 515
 516                 old = 0;
 517                 new = flags;
 518         } else if (rc == 0) {
 519                 if (add) {
 520                         if ((old & flags) == flags)
 521                                 GOTO(unlock, rc = 0);
 522
 523                         new = old | flags;
 524                 } else {
 525                         if ((old & flags) == 0)
 526                                 GOTO(unlock, rc = 0);
 527
 528                         new = old & ~flags;
 529                 }
 530         } else {
 531                 GOTO(log, rc);
 532         }
 533
 534         th = dt_trans_create(env, dev);
 535         if (IS_ERR(th))
 536                 GOTO(log, rc = PTR_ERR(th));
 537
 538         if (old != 0) {
 539                 rc = dt_declare_delete(env, obj,
 540                                        (const struct dt_key *)key, th);
 541                 if (rc != 0)
 542                         GOTO(log, rc);
 543         }
 544
 545         if (new != 0) {
 546                 rc = dt_declare_insert(env, obj,
 547                                        (const struct dt_rec *)&new,
 548                                        (const struct dt_key *)key, th);
 549                 if (rc != 0)
 550                         GOTO(log, rc);
 551         }
 552
 553         rc = dt_trans_start_local(env, dev, th);
 554         if (rc != 0)
 555                 GOTO(log, rc);
 556
 557         if (old != 0) {
 558                 rc = dt_delete(env, obj, (const struct dt_key *)key, th);
 559                 if (rc != 0)
 560                         GOTO(log, rc);
 561         }
 562
 563         if (new != 0) {
 564                 rc = dt_insert(env, obj, (const struct dt_rec *)&new,
 565                                (const struct dt_key *)key, th);
 566                 if (rc != 0)
 567                         GOTO(log, rc);
 568         }
 569
 570         GOTO(log, rc);
 571
 572 log:
 573         if (th != NULL && !IS_ERR(th))
 574                 dt_trans_stop(env, dev, th);
 575
 576         CDEBUG(D_LFSCK, "%s: namespace LFSCK %s flags for "DFID" in the "
 577                "trace file, flags %x, old %x, new %x: rc = %d\n",
 578                lfsck_lfsck2name(lfsck), add ? "add" : "del", PFID(fid),
 579                (__u32)flags, (__u32)old, (__u32)new, rc);
 580
 581 unlock:
 582         mutex_unlock(&com->lc_sub_trace_objs[idx].lsto_mutex);
 583         lfsck_object_put(env, obj);
 584
 585         return rc;
 586 }
 587
 588 int lfsck_namespace_check_exist(const struct lu_env *env,
 589                                 struct dt_object *dir,
 590                                 struct dt_object *obj, const char *name)
 591 {
 592         struct lu_fid    *fid = &lfsck_env_info(env)->lti_fid;
 593         int               rc;
 594         ENTRY;
 595
 596         if (unlikely(lfsck_is_dead_obj(obj)))
 597                 RETURN(LFSCK_NAMEENTRY_DEAD);
 598
 599         rc = dt_lookup(env, dir, (struct dt_rec *)fid,
 600                        (const struct dt_key *)name);
 601         if (rc == -ENOENT)
 602                 RETURN(LFSCK_NAMEENTRY_REMOVED);
 603
 604         if (rc < 0)
 605                 RETURN(rc);
 606
 607         if (!lu_fid_eq(fid, lfsck_dto2fid(obj)))
 608                 RETURN(LFSCK_NAMEENTRY_RECREATED);
 609
 610         RETURN(0);
 611 }
 612
 613 static int lfsck_declare_namespace_exec_dir(const struct lu_env *env,
 614                                             struct dt_object *obj,
 615                                             struct thandle *handle)
 616 {
 617         int rc;
 618
 619         /* For remote updating LINKEA, there may be further LFSCK action
 620          * on remote MDT after the updating, so update the LINKEA ASAP. */
 621         if (dt_object_remote(obj))
 622                 handle->th_sync = 1;
 623
 624         /* For destroying all invalid linkEA entries. */
 625         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, handle);
 626         if (rc == 0)
 627                 /* For insert new linkEA entry. */
 628                 rc = dt_declare_xattr_set(env, obj,
 629                         lfsck_buf_get_const(env, NULL, MAX_LINKEA_SIZE),
 630                         XATTR_NAME_LINK, 0, handle);
 631         return rc;
 632 }
 633
 634 int __lfsck_links_read(const struct lu_env *env, struct dt_object *obj,
 635                        struct linkea_data *ldata, bool with_rec)
 636 {
 637         int rc;
 638
 639         if (ldata->ld_buf->lb_buf == NULL)
 640                 return -ENOMEM;
 641
 642         if (!dt_object_exists(obj))
 643                 return -ENOENT;
 644
 645         rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK);
 646         if (rc == -ERANGE) {
 647                 /* Buf was too small, figure out what we need. */
 648                 rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LINK);
 649                 if (unlikely(rc == 0))
 650                         return -ENODATA;
 651
 652                 if (rc < 0)
 653                         return rc;
 654
 655                 lu_buf_realloc(ldata->ld_buf, rc);
 656                 if (ldata->ld_buf->lb_buf == NULL)
 657                         return -ENOMEM;
 658
 659                 rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK);
 660         }
 661
 662         if (unlikely(rc == 0))
 663                 return -ENODATA;
 664
 665         if (rc > 0) {
 666                 if (with_rec)
 667                         rc = linkea_init_with_rec(ldata);
 668                 else
 669                         rc = linkea_init(ldata);
 670         }
 671
 672         return rc;
 673 }
 674
 675 /**
 676  * Remove linkEA for the given object.
 677  *
 678  * The caller should take the ldlm lock before the calling.
 679  *
 680  * \param[in] env       pointer to the thread context
 681  * \param[in] com       pointer to the lfsck component
 682  * \param[in] obj       pointer to the dt_object to be handled
 683  *
 684  * \retval              0 for repaired cases
 685  * \retval              negative error number on failure
 686  */
 687 static int lfsck_namespace_links_remove(const struct lu_env *env,
 688                                         struct lfsck_component *com,
 689                                         struct dt_object *obj)
 690 {
 691         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 692         struct dt_device                *dev    = lfsck_obj2dev(obj);
 693         struct thandle                  *th     = NULL;
 694         int                              rc     = 0;
 695         ENTRY;
 696
 697         LASSERT(dt_object_remote(obj) == 0);
 698
 699         th = dt_trans_create(env, dev);
 700         if (IS_ERR(th))
 701                 GOTO(log, rc = PTR_ERR(th));
 702
 703         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, th);
 704         if (rc != 0)
 705                 GOTO(stop, rc);
 706
 707         rc = dt_trans_start_local(env, dev, th);
 708         if (rc != 0)
 709                 GOTO(stop, rc);
 710
 711         dt_write_lock(env, obj, 0);
 712         if (unlikely(lfsck_is_dead_obj(obj)))
 713                 GOTO(unlock, rc = -ENOENT);
 714
 715         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
 716                 GOTO(unlock, rc = 0);
 717
 718         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, th);
 719
 720         GOTO(unlock, rc);
 721
 722 unlock:
 723         dt_write_unlock(env, obj);
 724
 725 stop:
 726         dt_trans_stop(env, dev, th);
 727
 728 log:
 729         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove invalid linkEA "
 730                "for the object "DFID": rc = %d\n",
 731                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
 732
 733         if (rc == 0) {
 734                 struct lfsck_namespace *ns = com->lc_file_ram;
 735
 736                 ns->ln_flags |= LF_INCONSISTENT;
 737         }
 738
 739         return rc;
 740 }
 741
 742 static int lfsck_links_write(const struct lu_env *env, struct dt_object *obj,
 743                              struct linkea_data *ldata, struct thandle *handle)
 744 {
 745         struct lu_buf buf;
 746         int rc;
 747
 748         lfsck_buf_init(&buf, ldata->ld_buf->lb_buf, ldata->ld_leh->leh_len);
 749
 750 again:
 751         rc = dt_xattr_set(env, obj, &buf, XATTR_NAME_LINK, 0, handle);
 752         if (unlikely(rc == -ENOSPC)) {
 753                 rc = linkea_overflow_shrink(ldata);
 754                 if (likely(rc > 0)) {
 755                         buf.lb_len = rc;
 756                         goto again;
 757                 }
 758         }
 759
 760         return rc;
 761 }
 762
 763 static inline bool linkea_reclen_is_valid(const struct linkea_data *ldata)
 764 {
 765         if (ldata->ld_reclen <= 0)
 766                 return false;
 767
 768         if ((char *)ldata->ld_lee + ldata->ld_reclen >
 769             (char *)ldata->ld_leh + ldata->ld_leh->leh_len)
 770                 return false;
 771
 772         return true;
 773 }
 774
 775 static inline bool linkea_entry_is_valid(const struct linkea_data *ldata,
 776                                          const struct lu_name *cname,
 777                                          const struct lu_fid *pfid)
 778 {
 779         if (!linkea_reclen_is_valid(ldata))
 780                 return false;
 781
 782         if (cname->ln_namelen <= 0 || cname->ln_namelen > NAME_MAX)
 783                 return false;
 784
 785         if (!fid_is_sane(pfid))
 786                 return false;
 787
 788         return true;
 789 }
 790
 791 static int lfsck_namespace_unpack_linkea_entry(struct linkea_data *ldata,
 792                                                struct lu_name *cname,
 793                                                struct lu_fid *pfid,
 794                                                char *buf, const int buflen)
 795 {
 796         linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, cname, pfid);
 797         if (unlikely(!linkea_entry_is_valid(ldata, cname, pfid)))
 798                 return -EINVAL;
 799
 800         /* To guarantee the 'name' is terminated with '0'. */
 801         memcpy(buf, cname->ln_name, cname->ln_namelen);
 802         buf[cname->ln_namelen] = 0;
 803         cname->ln_name = buf;
 804
 805         return 0;
 806 }
 807
 808 static void lfsck_linkea_del_buf(struct linkea_data *ldata,
 809                                  const struct lu_name *lname)
 810 {
 811         LASSERT(ldata->ld_leh != NULL && ldata->ld_lee != NULL);
 812
 813         /* If current record is corrupted, all the subsequent
 814          * records will be dropped. */
 815         if (unlikely(!linkea_reclen_is_valid(ldata))) {
 816                 void *ptr = ldata->ld_lee;
 817
 818                 ldata->ld_leh->leh_len = sizeof(struct link_ea_header);
 819                 ldata->ld_leh->leh_reccount = 0;
 820                 linkea_first_entry(ldata);
 821                 while (ldata->ld_lee != NULL &&
 822                        (char *)ldata->ld_lee < (char *)ptr) {
 823                         int reclen = (ldata->ld_lee->lee_reclen[0] << 8) |
 824                                      ldata->ld_lee->lee_reclen[1];
 825
 826                         ldata->ld_leh->leh_len += reclen;
 827                         ldata->ld_leh->leh_reccount++;
 828                         ldata->ld_lee = (struct link_ea_entry *)
 829                                         ((char *)ldata->ld_lee + reclen);
 830                 }
 831
 832                 ldata->ld_lee = NULL;
 833         } else {
 834                 linkea_del_buf(ldata, lname);
 835         }
 836 }
 837
 838 static int lfsck_namespace_filter_linkea_entry(struct linkea_data *ldata,
 839                                                struct lu_name *cname,
 840                                                struct lu_fid *pfid,
 841                                                bool remove)
 842 {
 843         struct link_ea_entry    *oldlee;
 844         int                      oldlen;
 845         int                      repeated = 0;
 846
 847         oldlee = ldata->ld_lee;
 848         oldlen = ldata->ld_reclen;
 849         linkea_next_entry(ldata);
 850         while (ldata->ld_lee != NULL) {
 851                 ldata->ld_reclen = (ldata->ld_lee->lee_reclen[0] << 8) |
 852                                    ldata->ld_lee->lee_reclen[1];
 853                 if (unlikely(!linkea_reclen_is_valid(ldata))) {
 854                         lfsck_linkea_del_buf(ldata, NULL);
 855                         LASSERT(ldata->ld_lee == NULL);
 856                 } else if (unlikely(ldata->ld_reclen == oldlen &&
 857                              memcmp(ldata->ld_lee, oldlee, oldlen) == 0)) {
 858                         repeated++;
 859                         if (!remove)
 860                                 break;
 861
 862                         lfsck_linkea_del_buf(ldata, cname);
 863                 } else {
 864                         linkea_next_entry(ldata);
 865                 }
 866         }
 867         ldata->ld_lee = oldlee;
 868         ldata->ld_reclen = oldlen;
 869
 870         return repeated;
 871 }
 872
 873 /**
 874  * Insert orphan into .lustre/lost+found/MDTxxxx/ locally.
 875  *
 876  * Add the specified orphan MDT-object to the .lustre/lost+found/MDTxxxx/
 877  * with the given type to generate the name, the detailed rules for name
 878  * have been described as following.
 879  *
 880  * The function also generates the linkEA corresponding to the name entry
 881  * under the .lustre/lost+found/MDTxxxx/ for the orphan MDT-object.
 882  *
 883  * \param[in] env       pointer to the thread context
 884  * \param[in] com       pointer to the lfsck component
 885  * \param[in] orphan    pointer to the orphan MDT-object
 886  * \param[in] infix     additional information for the orphan name, such as
 887  *                      the FID for original
 888  * \param[in] type      the type for describing why the orphan MDT-object is
 889  *                      created. The rules are as following:
 890  *
 891  *  type "D":           The MDT-object is a directory, it may knows its parent
 892  *                      but because there is no valid linkEA, the LFSCK cannot
 893  *                      know where to put it back to the namespace.
 894  *  type "O":           The MDT-object has no linkEA, and there is no name
 895  *                      entry that references the MDT-object.
 896  *
 897  *  type "S":           The orphan MDT-object is a shard of a striped directory
 898  *
 899  * \see lfsck_layout_recreate_parent() for more types.
 900  *
 901  * The orphan name will be like:
 902  * ${FID}-${infix}-${type}-${conflict_version}
 903  *
 904  * \param[out] count    if some others inserted some linkEA entries by race,
 905  *                      then return the linkEA entries count.
 906  *
 907  * \retval              positive number for repaired cases
 908  * \retval              0 if needs to repair nothing
 909  * \retval              negative error number on failure
 910  */
 911 static int lfsck_namespace_insert_orphan(const struct lu_env *env,
 912                                          struct lfsck_component *com,
 913                                          struct dt_object *orphan,
 914                                          const char *infix, const char *type,
 915                                          int *count)
 916 {
 917         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 918         struct lu_name                  *cname  = &info->lti_name;
 919         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
 920         struct lu_attr                  *la     = &info->lti_la2;
 921         const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
 922         const struct lu_fid             *pfid;
 923         struct lu_fid                    tfid;
 924         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 925         struct dt_device                *dev    = lfsck_obj2dev(orphan);
 926         struct dt_object                *parent;
 927         struct thandle                  *th     = NULL;
 928         struct lfsck_lock_handle        *pllh   = &info->lti_llh;
 929         struct lustre_handle             clh    = { 0 };
 930         struct linkea_data               ldata2 = { NULL };
 931         struct lu_buf                    linkea_buf;
 932         int                              namelen;
 933         int                              idx    = 0;
 934         int                              rc     = 0;
 935         bool                             exist  = false;
 936         ENTRY;
 937
 938         cname->ln_name = NULL;
 939         if (unlikely(lfsck->li_lpf_obj == NULL))
 940                 GOTO(log, rc = -ENXIO);
 941
 942         parent = lfsck->li_lpf_obj;
 943         pfid = lfsck_dto2fid(parent);
 944
 945 again:
 946         do {
 947                 namelen = snprintf(info->lti_key, NAME_MAX, DFID"%s-%s-%d",
 948                                    PFID(cfid), infix, type, idx++);
 949                 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
 950                                (const struct dt_key *)info->lti_key);
 951                 if (rc != 0 && rc != -ENOENT)
 952                         GOTO(log, rc);
 953
 954                 if (unlikely(rc == 0 && lu_fid_eq(cfid, &tfid)))
 955                         exist = true;
 956         } while (rc == 0 && !exist);
 957
 958         rc = lfsck_lock(env, lfsck, parent, info->lti_key, pllh,
 959                         MDS_INODELOCK_UPDATE, LCK_PW);
 960         if (rc != 0)
 961                 GOTO(log, rc);
 962
 963         /* Re-check whether the name conflict with othrs after taken
 964          * the ldlm lock. */
 965         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
 966                        (const struct dt_key *)info->lti_key);
 967         if (rc == 0) {
 968                 if (!lu_fid_eq(cfid, &tfid)) {
 969                         exist = false;
 970                         lfsck_unlock(pllh);
 971                         goto again;
 972                 }
 973
 974                 exist = true;
 975         } else if (rc != -ENOENT) {
 976                 GOTO(log, rc);
 977         } else {
 978                 exist = false;
 979         }
 980
 981         cname->ln_name = info->lti_key;
 982         cname->ln_namelen = namelen;
 983         rc = linkea_links_new(&ldata2, &info->lti_linkea_buf2,
 984                               cname, pfid);
 985         if (rc != 0)
 986                 GOTO(log, rc);
 987
 988         rc = lfsck_ibits_lock(env, lfsck, orphan, &clh,
 989                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_LOOKUP |
 990                               MDS_INODELOCK_XATTR, LCK_EX);
 991         if (rc != 0)
 992                 GOTO(log, rc);
 993
 994         lfsck_buf_init(&linkea_buf, ldata2.ld_buf->lb_buf,
 995                        ldata2.ld_leh->leh_len);
 996         th = dt_trans_create(env, dev);
 997         if (IS_ERR(th))
 998                 GOTO(log, rc = PTR_ERR(th));
 999
1000         if (S_ISDIR(lfsck_object_type(orphan))) {
1001                 rc = dt_declare_delete(env, orphan,
1002                                        (const struct dt_key *)dotdot, th);
1003                 if (rc != 0)
1004                         GOTO(stop, rc);
1005
1006                 rec->rec_type = S_IFDIR;
1007                 rec->rec_fid = pfid;
1008                 rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
1009                                        (const struct dt_key *)dotdot, th);
1010                 if (rc != 0)
1011                         GOTO(stop, rc);
1012         }
1013
1014         rc = dt_declare_xattr_set(env, orphan, &linkea_buf,
1015                                   XATTR_NAME_LINK, 0, th);
1016         if (rc != 0)
1017                 GOTO(stop, rc);
1018
1019         if (!exist) {
1020                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
1021                 rec->rec_fid = cfid;
1022                 rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1023                                        (const struct dt_key *)cname->ln_name,
1024                                        th);
1025                 if (rc != 0)
1026                         GOTO(stop, rc);
1027
1028                 if (S_ISDIR(rec->rec_type)) {
1029                         rc = dt_declare_ref_add(env, parent, th);
1030                         if (rc != 0)
1031                                 GOTO(stop, rc);
1032                 }
1033         }
1034
1035         memset(la, 0, sizeof(*la));
1036         la->la_ctime = ktime_get_real_seconds();
1037         la->la_valid = LA_CTIME;
1038         rc = dt_declare_attr_set(env, orphan, la, th);
1039         if (rc != 0)
1040                 GOTO(stop, rc);
1041
1042         rc = dt_trans_start_local(env, dev, th);
1043         if (rc != 0)
1044                 GOTO(stop, rc);
1045
1046         dt_write_lock(env, orphan, 0);
1047         rc = lfsck_links_read2_with_rec(env, orphan, &ldata2);
1048         if (likely(rc == -ENODATA || rc == -EINVAL)) {
1049                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1050                         GOTO(unlock, rc = 1);
1051
1052                 if (S_ISDIR(lfsck_object_type(orphan))) {
1053                         rc = dt_delete(env, orphan,
1054                                        (const struct dt_key *)dotdot, th);
1055                         if (rc != 0)
1056                                 GOTO(unlock, rc);
1057
1058                         rec->rec_type = S_IFDIR;
1059                         rec->rec_fid = pfid;
1060                         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1061                                        (const struct dt_key *)dotdot, th);
1062                         if (rc != 0)
1063                                 GOTO(unlock, rc);
1064                 }
1065
1066                 rc = dt_xattr_set(env, orphan, &linkea_buf, XATTR_NAME_LINK, 0,
1067                                   th);
1068         } else {
1069                 if (rc == 0 && count != NULL)
1070                         *count = ldata2.ld_leh->leh_reccount;
1071
1072                 GOTO(unlock, rc);
1073         }
1074         dt_write_unlock(env, orphan);
1075
1076         if (rc == 0 && !exist) {
1077                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
1078                 rec->rec_fid = cfid;
1079                 rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1080                                (const struct dt_key *)cname->ln_name, th);
1081                 if (rc == 0 && S_ISDIR(rec->rec_type)) {
1082                         dt_write_lock(env, parent, 0);
1083                         rc = dt_ref_add(env, parent, th);
1084                         dt_write_unlock(env, parent);
1085                 }
1086         }
1087
1088         if (rc == 0)
1089                 rc = dt_attr_set(env, orphan, la, th);
1090
1091         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1092
1093 unlock:
1094         dt_write_unlock(env, orphan);
1095
1096 stop:
1097         dt_trans_stop(env, dev, th);
1098
1099 log:
1100         lfsck_ibits_unlock(&clh, LCK_EX);
1101         lfsck_unlock(pllh);
1102         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert orphan for the "
1103                "object "DFID", name = %s: rc = %d\n",
1104                lfsck_lfsck2name(lfsck), PFID(cfid),
1105                cname->ln_name != NULL ? cname->ln_name : "<NULL>", rc);
1106
1107         if (rc != 0) {
1108                 struct lfsck_namespace *ns = com->lc_file_ram;
1109
1110                 ns->ln_flags |= LF_INCONSISTENT;
1111         }
1112
1113         return rc;
1114 }
1115
1116 /**
1117  * Add the specified name entry back to namespace.
1118  *
1119  * If there is a linkEA entry that back references a name entry under
1120  * some parent directory, but such parent directory does not have the
1121  * claimed name entry. On the other hand, the linkEA entries count is
1122  * not larger than the MDT-object's hard link count. Under such case,
1123  * it is quite possible that the name entry is lost. Then the LFSCK
1124  * should add the name entry back to the namespace.
1125  *
1126  * \param[in] env       pointer to the thread context
1127  * \param[in] com       pointer to the lfsck component
1128  * \param[in] parent    pointer to the directory under which the name entry
1129  *                      will be inserted into
1130  * \param[in] child     pointer to the object referenced by the name entry
1131  *                      that to be inserted into the parent
1132  * \param[in] name      the name for the child in the parent directory
1133  *
1134  * \retval              positive number for repaired cases
1135  * \retval              0 if nothing to be repaired
1136  * \retval              negative error number on failure
1137  */
1138 static int lfsck_namespace_insert_normal(const struct lu_env *env,
1139                                          struct lfsck_component *com,
1140                                          struct dt_object *parent,
1141                                          struct dt_object *child,
1142                                          const char *name)
1143 {
1144         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1145         struct lu_attr                  *la     = &info->lti_la;
1146         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1147         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1148         /* The child and its name may be on different MDTs. */
1149         const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
1150         const struct lu_fid             *cfid   = lfsck_dto2fid(child);
1151         struct dt_device                *dev    = lfsck->li_next;
1152         struct thandle                  *th     = NULL;
1153         struct lfsck_lock_handle        *llh    = &info->lti_llh;
1154         int                              rc     = 0;
1155         ENTRY;
1156
1157         /* @parent/@child may be based on lfsck->li_bottom,
1158          * but here we need the object based on the lfsck->li_next. */
1159
1160         parent = lfsck_object_locate(dev, parent);
1161         if (IS_ERR(parent))
1162                 GOTO(log, rc = PTR_ERR(parent));
1163
1164         if (unlikely(!dt_try_as_dir(env, parent)))
1165                 GOTO(log, rc = -ENOTDIR);
1166
1167         child = lfsck_object_locate(dev, child);
1168         if (IS_ERR(child))
1169                 GOTO(log, rc = PTR_ERR(child));
1170
1171         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1172                 GOTO(log, rc = 1);
1173
1174         rc = lfsck_lock(env, lfsck, parent, name, llh,
1175                         MDS_INODELOCK_UPDATE, LCK_PW);
1176         if (rc != 0)
1177                 GOTO(log, rc);
1178
1179         th = dt_trans_create(env, dev);
1180         if (IS_ERR(th))
1181                 GOTO(unlock, rc = PTR_ERR(th));
1182
1183         rec->rec_type = lfsck_object_type(child) & S_IFMT;
1184         rec->rec_fid = cfid;
1185         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1186                                (const struct dt_key *)name, th);
1187         if (rc != 0)
1188                 GOTO(stop, rc);
1189
1190         if (S_ISDIR(rec->rec_type)) {
1191                 rc = dt_declare_ref_add(env, parent, th);
1192                 if (rc != 0)
1193                         GOTO(stop, rc);
1194         }
1195
1196         memset(la, 0, sizeof(*la));
1197         la->la_ctime = ktime_get_real_seconds();
1198         la->la_valid = LA_CTIME;
1199         rc = dt_declare_attr_set(env, parent, la, th);
1200         if (rc != 0)
1201                 GOTO(stop, rc);
1202
1203         rc = dt_declare_attr_set(env, child, la, th);
1204         if (rc != 0)
1205                 GOTO(stop, rc);
1206
1207         rc = dt_trans_start_local(env, dev, th);
1208         if (rc != 0)
1209                 GOTO(stop, rc);
1210
1211         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1212                        (const struct dt_key *)name, th);
1213         if (rc != 0)
1214                 GOTO(stop, rc);
1215
1216         if (S_ISDIR(rec->rec_type)) {
1217                 dt_write_lock(env, parent, 0);
1218                 rc = dt_ref_add(env, parent, th);
1219                 dt_write_unlock(env, parent);
1220                 if (rc != 0)
1221                         GOTO(stop, rc);
1222         }
1223
1224         la->la_ctime = ktime_get_real_seconds();
1225         rc = dt_attr_set(env, parent, la, th);
1226         if (rc != 0)
1227                 GOTO(stop, rc);
1228
1229         rc = dt_attr_set(env, child, la, th);
1230
1231         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1232
1233 stop:
1234         dt_trans_stop(env, dev, th);
1235
1236 unlock:
1237         lfsck_unlock(llh);
1238
1239 log:
1240         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert object "DFID" with "
1241                "the name %s and type %o to the parent "DFID": rc = %d\n",
1242                lfsck_lfsck2name(lfsck), PFID(cfid), name,
1243                lfsck_object_type(child) & S_IFMT, PFID(pfid), rc);
1244
1245         if (rc != 0) {
1246                 struct lfsck_namespace *ns = com->lc_file_ram;
1247
1248                 ns->ln_flags |= LF_INCONSISTENT;
1249                 if (rc > 0)
1250                         ns->ln_lost_dirent_repaired++;
1251         }
1252
1253         return rc;
1254 }
1255
1256 /**
1257  * Create the specified orphan directory.
1258  *
1259  * For the case that the parent MDT-object stored in some MDT-object's
1260  * linkEA entry is lost, the LFSCK will re-create the parent object as
1261  * an orphan and insert it into .lustre/lost+found/MDTxxxx/ directory
1262  * with the name ${FID}-P-${conflict_version}.
1263  *
1264  * \param[in] env       pointer to the thread context
1265  * \param[in] com       pointer to the lfsck component
1266  * \param[in] orphan    pointer to the orphan MDT-object to be created
1267  * \param[in] lmv       pointer to master LMV EA that will be set to the orphan
1268  *
1269  * \retval              positive number for repaired cases
1270  * \retval              negative error number on failure
1271  */
1272 static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
1273                                              struct lfsck_component *com,
1274                                              struct dt_object *orphan,
1275                                              struct lmv_mds_md_v1 *lmv)
1276 {
1277         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1278         struct lu_attr                  *la     = &info->lti_la;
1279         struct dt_allocation_hint       *hint   = &info->lti_hint;
1280         struct dt_object_format         *dof    = &info->lti_dof;
1281         struct lu_name                  *cname  = &info->lti_name2;
1282         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1283         struct lmv_mds_md_v1            *lmv2   = &info->lti_lmv2;
1284         const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
1285         struct lu_fid                    tfid;
1286         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1287         struct lfsck_namespace          *ns     = com->lc_file_ram;
1288         struct dt_device                *dev    = lfsck_obj2dev(orphan);
1289         struct dt_object                *parent = NULL;
1290         struct thandle                  *th     = NULL;
1291         struct lfsck_lock_handle        *llh    = &info->lti_llh;
1292         struct linkea_data               ldata  = { NULL };
1293         struct lu_buf                    linkea_buf;
1294         struct lu_buf                    lmv_buf;
1295         char                             name[32];
1296         int                              namelen;
1297         int                              idx    = 0;
1298         int                              rc     = 0;
1299         int                              rc1    = 0;
1300         ENTRY;
1301
1302         LASSERT(!dt_object_exists(orphan));
1303
1304         cname->ln_name = NULL;
1305         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1306                 GOTO(log, rc = 1);
1307
1308         if (dt_object_remote(orphan)) {
1309                 LASSERT(lfsck->li_lpf_root_obj != NULL);
1310
1311                 idx = lfsck_find_mdt_idx_by_fid(env, lfsck, cfid);
1312                 if (idx < 0)
1313                         GOTO(log, rc = idx);
1314
1315                 snprintf(name, 8, "MDT%04x", idx);
1316                 rc = dt_lookup(env, lfsck->li_lpf_root_obj,
1317                                (struct dt_rec *)&tfid,
1318                                (const struct dt_key *)name);
1319                 if (rc != 0)
1320                         GOTO(log, rc = (rc == -ENOENT ? -ENXIO : rc));
1321
1322                 parent = lfsck_object_find_bottom(env, lfsck, &tfid);
1323                 if (IS_ERR(parent))
1324                         GOTO(log, rc = PTR_ERR(parent));
1325
1326                 if (unlikely(!dt_try_as_dir(env, parent)))
1327                         GOTO(log, rc = -ENOTDIR);
1328         } else {
1329                 if (unlikely(lfsck->li_lpf_obj == NULL))
1330                         GOTO(log, rc = -ENXIO);
1331
1332                 parent = lfsck->li_lpf_obj;
1333         }
1334
1335         dev = lfsck_find_dev_by_fid(env, lfsck, cfid);
1336         if (IS_ERR(dev))
1337                 GOTO(log, rc = PTR_ERR(dev));
1338
1339         idx = 0;
1340
1341 again:
1342         do {
1343                 namelen = snprintf(name, 31, DFID"-P-%d",
1344                                    PFID(cfid), idx++);
1345                 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
1346                                (const struct dt_key *)name);
1347                 if (rc != 0 && rc != -ENOENT)
1348                         GOTO(log, rc);
1349         } while (rc == 0);
1350
1351         rc = lfsck_lock(env, lfsck, parent, name, llh,
1352                         MDS_INODELOCK_UPDATE, LCK_PW);
1353         if (rc != 0)
1354                 GOTO(log, rc);
1355
1356         /* Re-check whether the name conflict with othrs after taken
1357          * the ldlm lock. */
1358         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
1359                        (const struct dt_key *)name);
1360         if (unlikely(rc == 0)) {
1361                 lfsck_unlock(llh);
1362                 goto again;
1363         }
1364
1365         if (rc != -ENOENT)
1366                 GOTO(unlock1, rc);
1367
1368         cname->ln_name = name;
1369         cname->ln_namelen = namelen;
1370
1371         memset(la, 0, sizeof(*la));
1372         la->la_mode = S_IFDIR | 0700;
1373         la->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
1374                        LA_ATIME | LA_MTIME | LA_CTIME;
1375
1376         orphan->do_ops->do_ah_init(env, hint, parent, orphan,
1377                                    la->la_mode & S_IFMT);
1378
1379         memset(dof, 0, sizeof(*dof));
1380         dof->dof_type = dt_mode_to_dft(S_IFDIR);
1381
1382         rc = linkea_links_new(&ldata, &info->lti_linkea_buf2,
1383                               cname, lfsck_dto2fid(parent));
1384         if (rc != 0)
1385                 GOTO(unlock1, rc);
1386
1387         th = dt_trans_create(env, dev);
1388         if (IS_ERR(th))
1389                 GOTO(unlock1, rc = PTR_ERR(th));
1390
1391         /* Sync the remote transaction to guarantee that the subsequent
1392          * lock against the @orphan can find the @orphan in time. */
1393         if (dt_object_remote(orphan))
1394                 th->th_sync = 1;
1395
1396         rc = dt_declare_create(env, orphan, la, hint, dof, th);
1397         if (rc != 0)
1398                 GOTO(stop, rc);
1399
1400         if (unlikely(!dt_try_as_dir(env, orphan)))
1401                 GOTO(stop, rc = -ENOTDIR);
1402
1403         rc = dt_declare_ref_add(env, orphan, th);
1404         if (rc != 0)
1405                 GOTO(stop, rc);
1406
1407         rec->rec_type = S_IFDIR;
1408         rec->rec_fid = cfid;
1409         rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
1410                                (const struct dt_key *)dot, th);
1411         if (rc != 0)
1412                 GOTO(stop, rc);
1413
1414         rec->rec_fid = lfsck_dto2fid(parent);
1415         rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
1416                                (const struct dt_key *)dotdot, th);
1417         if (rc != 0)
1418                 GOTO(stop, rc);
1419
1420         if (lmv != NULL) {
1421                 lmv->lmv_magic = LMV_MAGIC;
1422                 lmv->lmv_master_mdt_index = lfsck_dev_idx(lfsck);
1423                 lfsck_lmv_header_cpu_to_le(lmv2, lmv);
1424                 lfsck_buf_init(&lmv_buf, lmv2, sizeof(*lmv2));
1425                 rc = dt_declare_xattr_set(env, orphan, &lmv_buf,
1426                                           XATTR_NAME_LMV, 0, th);
1427                 if (rc != 0)
1428                         GOTO(stop, rc);
1429         }
1430
1431         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
1432                        ldata.ld_leh->leh_len);
1433         rc = dt_declare_xattr_set(env, orphan, &linkea_buf,
1434                                   XATTR_NAME_LINK, 0, th);
1435         if (rc != 0)
1436                 GOTO(stop, rc);
1437
1438         rec->rec_fid = cfid;
1439         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1440                                (const struct dt_key *)name, th);
1441         if (rc == 0)
1442                 rc = dt_declare_ref_add(env, parent, th);
1443
1444         if (rc != 0)
1445                 GOTO(stop, rc);
1446
1447         rc = dt_trans_start_local(env, dev, th);
1448         if (rc != 0)
1449                 GOTO(stop, rc);
1450
1451         dt_write_lock(env, orphan, 0);
1452         rc = dt_create(env, orphan, la, hint, dof, th);
1453         if (rc != 0)
1454                 GOTO(unlock2, rc);
1455
1456         rc = dt_ref_add(env, orphan, th);
1457         if (rc != 0)
1458                 GOTO(unlock2, rc);
1459
1460         rec->rec_fid = cfid;
1461         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1462                        (const struct dt_key *)dot, th);
1463         if (rc != 0)
1464                 GOTO(unlock2, rc);
1465
1466         rec->rec_fid = lfsck_dto2fid(parent);
1467         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1468                        (const struct dt_key *)dotdot, th);
1469         if (rc != 0)
1470                 GOTO(unlock2, rc);
1471
1472         if (lmv != NULL) {
1473                 rc = dt_xattr_set(env, orphan, &lmv_buf, XATTR_NAME_LMV, 0, th);
1474                 if (rc != 0)
1475                         GOTO(unlock2, rc);
1476         }
1477
1478         rc = dt_xattr_set(env, orphan, &linkea_buf,
1479                           XATTR_NAME_LINK, 0, th);
1480         dt_write_unlock(env, orphan);
1481         if (rc != 0)
1482                 GOTO(stop, rc);
1483
1484         rec->rec_fid = cfid;
1485         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1486                        (const struct dt_key *)name, th);
1487         if (rc == 0) {
1488                 dt_write_lock(env, parent, 0);
1489                 rc = dt_ref_add(env, parent, th);
1490                 dt_write_unlock(env, parent);
1491         }
1492
1493         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1494
1495 unlock2:
1496         dt_write_unlock(env, orphan);
1497
1498 stop:
1499         rc1 = dt_trans_stop(env, dev, th);
1500         if (rc1 != 0 && rc > 0)
1501                 rc = rc1;
1502
1503 unlock1:
1504         lfsck_unlock(llh);
1505
1506 log:
1507         CDEBUG(D_LFSCK, "%s: namespace LFSCK create orphan dir for "
1508                "the object "DFID", name = %s: rc = %d\n",
1509                lfsck_lfsck2name(lfsck), PFID(cfid),
1510                cname->ln_name != NULL ? cname->ln_name : "<NULL>", rc);
1511
1512         if (parent != NULL && !IS_ERR(parent) && parent != lfsck->li_lpf_obj)
1513                 lfsck_object_put(env, parent);
1514
1515         if (rc != 0)
1516                 ns->ln_flags |= LF_INCONSISTENT;
1517
1518         return rc;
1519 }
1520
1521 /**
1522  * Remove the specified entry from the linkEA.
1523  *
1524  * Locate the linkEA entry with the given @cname and @pfid, then
1525  * remove this entry or the other entries those are repeated with
1526  * this entry.
1527  *
1528  * \param[in] env       pointer to the thread context
1529  * \param[in] com       pointer to the lfsck component
1530  * \param[in] obj       pointer to the dt_object to be handled
1531  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
1532  * \param[in] cname     the name for the child in the parent directory
1533  * \param[in] pfid      the parent directory's FID for the linkEA
1534  * \param[in] next      if true, then remove the first found linkEA
1535  *                      entry, and move the ldata->ld_lee to next entry
1536  *
1537  * \retval              positive number for repaired cases
1538  * \retval              0 if nothing to be repaired
1539  * \retval              negative error number on failure
1540  */
1541 static int lfsck_namespace_shrink_linkea(const struct lu_env *env,
1542                                          struct lfsck_component *com,
1543                                          struct dt_object *obj,
1544                                          struct linkea_data *ldata,
1545                                          struct lu_name *cname,
1546                                          struct lu_fid *pfid,
1547                                          bool next)
1548 {
1549         struct lfsck_instance           *lfsck     = com->lc_lfsck;
1550         struct dt_device                *dev       = lfsck_obj2dev(obj);
1551         struct lfsck_bookmark           *bk        = &lfsck->li_bookmark_ram;
1552         struct thandle                  *th        = NULL;
1553         struct lustre_handle             lh        = { 0 };
1554         struct linkea_data               ldata_new = { NULL };
1555         struct lu_buf                    linkea_buf;
1556         int                              buflen    = 0;
1557         int                              rc        = 0;
1558         ENTRY;
1559
1560         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
1561                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
1562                               LCK_EX);
1563         if (rc != 0)
1564                 GOTO(log, rc);
1565
1566         if (next)
1567                 lfsck_linkea_del_buf(ldata, cname);
1568         else
1569                 lfsck_namespace_filter_linkea_entry(ldata, cname, pfid,
1570                                                     true);
1571         if (ldata->ld_leh->leh_reccount > 0 ||
1572             unlikely(ldata->ld_leh->leh_overflow_time)) {
1573                 lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
1574                                ldata->ld_leh->leh_len);
1575                 buflen = linkea_buf.lb_len;
1576         }
1577
1578 again:
1579         th = dt_trans_create(env, dev);
1580         if (IS_ERR(th))
1581                 GOTO(unlock1, rc = PTR_ERR(th));
1582
1583         if (buflen != 0)
1584                 rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1585                                           XATTR_NAME_LINK, 0, th);
1586         else
1587                 rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, th);
1588         if (rc != 0)
1589                 GOTO(stop, rc);
1590
1591         rc = dt_trans_start_local(env, dev, th);
1592         if (rc != 0)
1593                 GOTO(stop, rc);
1594
1595         dt_write_lock(env, obj, 0);
1596         if (unlikely(lfsck_is_dead_obj(obj)))
1597                 GOTO(unlock2, rc = -ENOENT);
1598
1599         rc = lfsck_links_read2_with_rec(env, obj, &ldata_new);
1600         if (rc)
1601                 GOTO(unlock2, rc = (rc == -ENODATA ? 0 : rc));
1602
1603         /* The specified linkEA entry has been removed by race. */
1604         rc = linkea_links_find(&ldata_new, cname, pfid);
1605         if (rc != 0)
1606                 GOTO(unlock2, rc = 0);
1607
1608         if (bk->lb_param & LPF_DRYRUN)
1609                 GOTO(unlock2, rc = 1);
1610
1611         if (next)
1612                 lfsck_linkea_del_buf(&ldata_new, cname);
1613         else
1614                 lfsck_namespace_filter_linkea_entry(&ldata_new, cname, pfid,
1615                                                     true);
1616
1617         /*
1618          * linkea may change because it doesn't take lock in the first read, if
1619          * it becomes larger, restart from beginning.
1620          */
1621         if ((ldata_new.ld_leh->leh_reccount > 0 ||
1622              unlikely(ldata_new.ld_leh->leh_overflow_time)) &&
1623             buflen < ldata_new.ld_leh->leh_len) {
1624                 dt_write_unlock(env, obj);
1625                 dt_trans_stop(env, dev, th);
1626                 lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
1627                                ldata_new.ld_leh->leh_len);
1628                 buflen = linkea_buf.lb_len;
1629                 goto again;
1630         }
1631
1632         if (buflen)
1633                 rc = lfsck_links_write(env, obj, &ldata_new, th);
1634         else
1635                 rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, th);
1636
1637         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
1638
1639 unlock2:
1640         dt_write_unlock(env, obj);
1641
1642 stop:
1643         dt_trans_stop(env, dev, th);
1644
1645 unlock1:
1646         lfsck_ibits_unlock(&lh, LCK_EX);
1647
1648 log:
1649         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove %s linkEA entry "
1650                "for the object: "DFID", parent "DFID", name %.*s\n",
1651                lfsck_lfsck2name(lfsck), next ? "invalid" : "redundant",
1652                PFID(lfsck_dto2fid(obj)), PFID(pfid), cname->ln_namelen,
1653                cname->ln_name);
1654
1655         if (rc != 0) {
1656                 struct lfsck_namespace *ns = com->lc_file_ram;
1657
1658                 ns->ln_flags |= LF_INCONSISTENT;
1659         }
1660
1661         return rc;
1662 }
1663
1664 /**
1665  * Conditionally remove the specified entry from the linkEA.
1666  *
1667  * Take the parent lock firstly, then check whether the specified
1668  * name entry exists or not: if yes, do nothing; otherwise, call
1669  * lfsck_namespace_shrink_linkea() to remove the linkea entry.
1670  *
1671  * \param[in] env       pointer to the thread context
1672  * \param[in] com       pointer to the lfsck component
1673  * \param[in] parent    pointer to the parent directory
1674  * \param[in] child     pointer to the child object that holds the linkEA
1675  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
1676  * \param[in] cname     the name for the child in the parent directory
1677  * \param[in] pfid      the parent directory's FID for the linkEA
1678  *
1679  * \retval              positive number for repaired cases
1680  * \retval              0 if nothing to be repaired
1681  * \retval              negative error number on failure
1682  */
1683 static int lfsck_namespace_shrink_linkea_cond(const struct lu_env *env,
1684                                               struct lfsck_component *com,
1685                                               struct dt_object *parent,
1686                                               struct dt_object *child,
1687                                               struct linkea_data *ldata,
1688                                               struct lu_name *cname,
1689                                               struct lu_fid *pfid)
1690 {
1691         struct lfsck_thread_info *info  = lfsck_env_info(env);
1692         struct lu_fid            *cfid  = &info->lti_fid3;
1693         struct lfsck_lock_handle *llh   = &info->lti_llh;
1694         int                       rc;
1695         ENTRY;
1696
1697         rc = lfsck_lock(env, com->lc_lfsck, parent, cname->ln_name, llh,
1698                         MDS_INODELOCK_UPDATE, LCK_PR);
1699         if (rc != 0)
1700                 RETURN(rc);
1701
1702         dt_read_lock(env, parent, 0);
1703         if (unlikely(lfsck_is_dead_obj(parent))) {
1704                 dt_read_unlock(env, parent);
1705                 lfsck_unlock(llh);
1706                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1707                                                    cname, pfid, true);
1708
1709                 RETURN(rc);
1710         }
1711
1712         rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
1713                        (const struct dt_key *)cname->ln_name);
1714         dt_read_unlock(env, parent);
1715
1716         /* It is safe to release the ldlm lock, because when the logic come
1717          * here, we have got all the needed information above whether the
1718          * linkEA entry is valid or not. It is not important that others
1719          * may add new linkEA entry after the ldlm lock released. If other
1720          * has removed the specified linkEA entry by race, then it is OK,
1721          * because the subsequent lfsck_namespace_shrink_linkea() can handle
1722          * such case. */
1723         lfsck_unlock(llh);
1724         if (rc == -ENOENT) {
1725                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1726                                                    cname, pfid, true);
1727
1728                 RETURN(rc);
1729         }
1730
1731         if (rc != 0)
1732                 RETURN(rc);
1733
1734         /* The LFSCK just found some internal status of cross-MDTs
1735          * create operation. That is normal. */
1736         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
1737                 linkea_next_entry(ldata);
1738
1739                 RETURN(0);
1740         }
1741
1742         rc = lfsck_namespace_shrink_linkea(env, com, child, ldata, cname,
1743                                            pfid, true);
1744
1745         RETURN(rc);
1746 }
1747
1748 /**
1749  * Conditionally replace name entry in the parent.
1750  *
1751  * As required, the LFSCK may re-create the lost MDT-object for dangling
1752  * name entry, but such repairing may be wrong because of bad FID in the
1753  * name entry. As the LFSCK processing, the real MDT-object may be found,
1754  * then the LFSCK should check whether the former re-created MDT-object
1755  * has been modified or not, if not, then destroy it and update the name
1756  * entry in the parent to reference the real MDT-object.
1757  *
1758  * \param[in] env       pointer to the thread context
1759  * \param[in] com       pointer to the lfsck component
1760  * \param[in] parent    pointer to the parent directory
1761  * \param[in] child     pointer to the MDT-object that may be the real
1762  *                      MDT-object corresponding to the name entry in parent
1763  * \param[in] cfid      the current FID in the name entry
1764  * \param[in] cname     contains the name of the child in the parent directory
1765  *
1766  * \retval              positive number for repaired cases
1767  * \retval              0 if nothing to be repaired
1768  * \retval              negative error number on failure
1769  */
1770 static int lfsck_namespace_replace_cond(const struct lu_env *env,
1771                                         struct lfsck_component *com,
1772                                         struct dt_object *parent,
1773                                         struct dt_object *child,
1774                                         const struct lu_fid *cfid,
1775                                         const struct lu_name *cname)
1776 {
1777         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1778         struct lu_attr                  *la     = &info->lti_la;
1779         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1780         struct lu_fid                    tfid;
1781         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1782         /* The child and its name may be on different MDTs. */
1783         struct dt_device                *dev    = lfsck->li_next;
1784         const char                      *name   = cname->ln_name;
1785         const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
1786         struct dt_object                *cobj   = NULL;
1787         struct lfsck_lock_handle        *pllh   = &info->lti_llh;
1788         struct lustre_handle             clh    = { 0 };
1789         struct linkea_data               ldata  = { NULL };
1790         struct thandle                  *th     = NULL;
1791         bool                             exist  = true;
1792         int                              rc     = 0;
1793         ENTRY;
1794
1795         /* @parent/@child may be based on lfsck->li_bottom,
1796          * but here we need the object based on the lfsck->li_next. */
1797
1798         parent = lfsck_object_locate(dev, parent);
1799         if (IS_ERR(parent))
1800                 GOTO(log, rc = PTR_ERR(parent));
1801
1802         if (unlikely(!dt_try_as_dir(env, parent)))
1803                 GOTO(log, rc = -ENOTDIR);
1804
1805         rc = lfsck_lock(env, lfsck, parent, name, pllh,
1806                         MDS_INODELOCK_UPDATE, LCK_PW);
1807         if (rc != 0)
1808                 GOTO(log, rc);
1809
1810         if (!fid_is_sane(cfid)) {
1811                 exist = false;
1812                 goto replace;
1813         }
1814
1815         cobj = lfsck_object_find_by_dev(env, dev, cfid);
1816         if (IS_ERR(cobj)) {
1817                 rc = PTR_ERR(cobj);
1818                 if (rc == -ENOENT) {
1819                         exist = false;
1820                         goto replace;
1821                 }
1822
1823                 GOTO(log, rc);
1824         }
1825
1826         if (!dt_object_exists(cobj)) {
1827                 exist = false;
1828                 goto replace;
1829         }
1830
1831         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
1832                        (const struct dt_key *)name);
1833         if (rc == -ENOENT) {
1834                 exist = false;
1835                 goto replace;
1836         }
1837
1838         if (rc != 0)
1839                 GOTO(log, rc);
1840
1841         /* Someone changed the name entry, cannot replace it. */
1842         if (!lu_fid_eq(cfid, &tfid))
1843                 GOTO(log, rc = 0);
1844
1845         /* lock the object to be destroyed. */
1846         rc = lfsck_ibits_lock(env, lfsck, cobj, &clh,
1847                               MDS_INODELOCK_UPDATE |
1848                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
1849                               LCK_EX);
1850         if (rc != 0)
1851                 GOTO(log, rc);
1852
1853         if (unlikely(lfsck_is_dead_obj(cobj))) {
1854                 exist = false;
1855                 goto replace;
1856         }
1857
1858         rc = dt_attr_get(env, cobj, la);
1859         if (rc != 0)
1860                 GOTO(log, rc);
1861
1862         /* The object has been modified by other(s), or it is not created by
1863          * LFSCK, the two cases are indistinguishable. So cannot replace it. */
1864         if (la->la_ctime != 0)
1865                 GOTO(log, rc);
1866
1867         if (S_ISREG(la->la_mode)) {
1868                 rc = dt_xattr_get(env, cobj, &LU_BUF_NULL, XATTR_NAME_LOV);
1869                 /* If someone has created related OST-object(s),
1870                  * then keep it. */
1871                 if ((rc > 0) || (rc < 0 && rc != -ENODATA))
1872                         GOTO(log, rc = (rc > 0 ? 0 : rc));
1873         }
1874
1875 replace:
1876         dt_read_lock(env, child, 0);
1877         rc = lfsck_links_read2_with_rec(env, child, &ldata);
1878         dt_read_unlock(env, child);
1879
1880         /* Someone changed the child, no need to replace. */
1881         if (rc == -ENODATA)
1882                 GOTO(log, rc = 0);
1883
1884         if (rc != 0)
1885                 GOTO(log, rc);
1886
1887         rc = linkea_links_find(&ldata, cname, pfid);
1888         /* Someone moved the child, no need to replace. */
1889         if (rc != 0)
1890                 GOTO(log, rc = 0);
1891
1892         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1893                 GOTO(log, rc = 1);
1894
1895         th = dt_trans_create(env, dev);
1896         if (IS_ERR(th))
1897                 GOTO(log, rc = PTR_ERR(th));
1898
1899         if (exist) {
1900                 rc = dt_declare_destroy(env, cobj, th);
1901                 if (rc != 0)
1902                         GOTO(stop, rc);
1903         }
1904
1905         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
1906         if (rc != 0)
1907                 GOTO(stop, rc);
1908
1909         rec->rec_type = S_IFDIR;
1910         rec->rec_fid = lfsck_dto2fid(child);
1911         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1912                                (const struct dt_key *)name, th);
1913         if (rc != 0)
1914                 GOTO(stop, rc);
1915
1916         rc = dt_trans_start_local(env, dev, th);
1917         if (rc != 0)
1918                 GOTO(stop, rc);
1919
1920         if (exist) {
1921                 rc = dt_destroy(env, cobj, th);
1922                 if (rc != 0)
1923                         GOTO(stop, rc);
1924         }
1925
1926         /* The old name entry maybe not exist. */
1927         rc = dt_delete(env, parent, (const struct dt_key *)name, th);
1928         if (rc != 0 && rc != -ENOENT)
1929                 GOTO(stop, rc);
1930
1931         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1932                        (const struct dt_key *)name, th);
1933
1934         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1935
1936 stop:
1937         dt_trans_stop(env, dev, th);
1938
1939 log:
1940         lfsck_ibits_unlock(&clh, LCK_EX);
1941         lfsck_unlock(pllh);
1942
1943         if (cobj != NULL && !IS_ERR(cobj))
1944                 lfsck_object_put(env, cobj);
1945
1946         CDEBUG(D_LFSCK, "%s: namespace LFSCK conditionally destroy the "
1947                "object "DFID" because of conflict with the object "DFID
1948                " under the parent "DFID" with name %s: rc = %d\n",
1949                lfsck_lfsck2name(lfsck), PFID(cfid),
1950                PFID(lfsck_dto2fid(child)), PFID(pfid), name, rc);
1951
1952         return rc;
1953 }
1954
1955 /**
1956  * Overwrite the linkEA for the object with the given ldata.
1957  *
1958  * The caller should take the ldlm lock before the calling.
1959  *
1960  * \param[in] env       pointer to the thread context
1961  * \param[in] com       pointer to the lfsck component
1962  * \param[in] obj       pointer to the dt_object to be handled
1963  * \param[in] ldata     pointer to the new linkEA data
1964  *
1965  * \retval              positive number for repaired cases
1966  * \retval              0 if nothing to be repaired
1967  * \retval              negative error number on failure
1968  */
1969 int lfsck_namespace_rebuild_linkea(const struct lu_env *env,
1970                                    struct lfsck_component *com,
1971                                    struct dt_object *obj,
1972                                    struct linkea_data *ldata)
1973 {
1974         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1975         struct dt_device                *dev    = lfsck_obj2dev(obj);
1976         struct thandle                  *th     = NULL;
1977         struct lu_buf                    linkea_buf;
1978         int                              rc     = 0;
1979         ENTRY;
1980
1981         th = dt_trans_create(env, dev);
1982         if (IS_ERR(th))
1983                 GOTO(log, rc = PTR_ERR(th));
1984
1985         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
1986                        ldata->ld_leh->leh_len);
1987         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1988                                   XATTR_NAME_LINK, 0, th);
1989         if (rc != 0)
1990                 GOTO(stop, rc);
1991
1992         rc = dt_trans_start_local(env, dev, th);
1993         if (rc != 0)
1994                 GOTO(stop, rc);
1995
1996         dt_write_lock(env, obj, 0);
1997         if (unlikely(lfsck_is_dead_obj(obj)))
1998                 GOTO(unlock, rc = 0);
1999
2000         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2001                 GOTO(unlock, rc = 1);
2002
2003         rc = dt_xattr_set(env, obj, &linkea_buf,
2004                           XATTR_NAME_LINK, 0, th);
2005
2006         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2007
2008 unlock:
2009         dt_write_unlock(env, obj);
2010
2011 stop:
2012         dt_trans_stop(env, dev, th);
2013
2014 log:
2015         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild linkEA for the "
2016                "object "DFID": rc = %d\n",
2017                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
2018
2019         if (rc != 0) {
2020                 struct lfsck_namespace *ns = com->lc_file_ram;
2021
2022                 ns->ln_flags |= LF_INCONSISTENT;
2023         }
2024
2025         return rc;
2026 }
2027
2028 /**
2029  * Repair invalid name entry.
2030  *
2031  * If the name entry contains invalid information, such as bad file type
2032  * or (and) corrupted object FID, then either remove the name entry or
2033  * udpate the name entry with the given (right) information.
2034  *
2035  * \param[in] env       pointer to the thread context
2036  * \param[in] com       pointer to the lfsck component
2037  * \param[in] parent    pointer to the parent directory
2038  * \param[in] child     pointer to the object referenced by the name entry
2039  * \param[in] name      the old name of the child under the parent directory
2040  * \param[in] name2     the new name of the child under the parent directory
2041  * \param[in] type      the type claimed by the name entry
2042  * \param[in] update    update the name entry if true; otherwise, remove it
2043  * \param[in] dec       decrease the parent nlink count if true
2044  *
2045  * \retval              positive number for repaired successfully
2046  * \retval              0 if nothing to be repaired
2047  * \retval              negative error number on failure
2048  */
2049 int lfsck_namespace_repair_dirent(const struct lu_env *env,
2050                                   struct lfsck_component *com,
2051                                   struct dt_object *parent,
2052                                   struct dt_object *child,
2053                                   const char *name, const char *name2,
2054                                   __u16 type, bool update, bool dec)
2055 {
2056         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2057         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
2058         const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
2059         struct lu_fid                   cfid    = {0};
2060         struct lu_fid                    tfid;
2061         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2062         struct dt_device                *dev    = lfsck->li_next;
2063         struct thandle                  *th     = NULL;
2064         struct lfsck_lock_handle        *llh    = &info->lti_llh;
2065         struct lustre_handle             lh     = { 0 };
2066         int                              rc     = 0;
2067         ENTRY;
2068
2069         if (child)
2070                 cfid = *lfsck_dto2fid(child);
2071         parent = lfsck_object_locate(dev, parent);
2072         if (IS_ERR(parent))
2073                 GOTO(log, rc = PTR_ERR(parent));
2074
2075         if (unlikely(!dt_try_as_dir(env, parent)))
2076                 GOTO(log, rc = -ENOTDIR);
2077
2078         if (!update || strcmp(name, name2) == 0)
2079                 rc = lfsck_lock(env, lfsck, parent, name, llh,
2080                                 MDS_INODELOCK_UPDATE, LCK_PW);
2081         else
2082                 rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
2083                                       MDS_INODELOCK_UPDATE, LCK_PW);
2084         if (rc != 0)
2085                 GOTO(log, rc);
2086
2087         th = dt_trans_create(env, dev);
2088         if (IS_ERR(th))
2089                 GOTO(unlock1, rc = PTR_ERR(th));
2090
2091         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
2092         if (rc != 0)
2093                 GOTO(stop, rc);
2094
2095         if (update) {
2096                 rec->rec_type = lfsck_object_type(child) & S_IFMT;
2097                 LASSERT(!fid_is_zero(&cfid));
2098                 rec->rec_fid = &cfid;
2099                 rc = dt_declare_insert(env, parent,
2100                                        (const struct dt_rec *)rec,
2101                                        (const struct dt_key *)name2, th);
2102                 if (rc != 0)
2103                         GOTO(stop, rc);
2104         }
2105
2106         if (dec && S_ISDIR(type)) {
2107                 rc = dt_declare_ref_del(env, parent, th);
2108                 if (rc != 0)
2109                         GOTO(stop, rc);
2110         }
2111
2112         rc = dt_trans_start_local(env, dev, th);
2113         if (rc != 0)
2114                 GOTO(stop, rc);
2115
2116
2117         dt_write_lock(env, parent, 0);
2118         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
2119                        (const struct dt_key *)name);
2120         /* Someone has removed the bad name entry by race. */
2121         if (rc == -ENOENT)
2122                 GOTO(unlock2, rc = 0);
2123
2124         if (rc != 0)
2125                 GOTO(unlock2, rc);
2126
2127         /* Someone has removed the bad name entry and reused it for other
2128          * object by race. */
2129         if (!lu_fid_eq(&tfid, &cfid))
2130                 GOTO(unlock2, rc = 0);
2131
2132         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2133                 GOTO(unlock2, rc = 1);
2134
2135         rc = dt_delete(env, parent, (const struct dt_key *)name, th);
2136         if (rc != 0)
2137                 GOTO(unlock2, rc);
2138
2139         if (update) {
2140                 rc = dt_insert(env, parent,
2141                                (const struct dt_rec *)rec,
2142                                (const struct dt_key *)name2, th);
2143                 if (rc != 0)
2144                         GOTO(unlock2, rc);
2145         }
2146
2147         if (dec && S_ISDIR(type)) {
2148                 rc = dt_ref_del(env, parent, th);
2149                 if (rc != 0)
2150                         GOTO(unlock2, rc);
2151         }
2152
2153         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
2154
2155 unlock2:
2156         dt_write_unlock(env, parent);
2157
2158 stop:
2159         dt_trans_stop(env, dev, th);
2160
2161         /* We are not sure whether the child will become orphan or not.
2162          * Record it in the LFSCK trace file for further checking in
2163          * the second-stage scanning. */
2164         if (!update && !dec && child && rc == 0)
2165                 lfsck_namespace_trace_update(env, com, &cfid,
2166                                              LNTF_CHECK_LINKEA, true);
2167
2168 unlock1:
2169         /* It is harmless even if unlock the unused lock_handle */
2170         lfsck_ibits_unlock(&lh, LCK_PW);
2171         lfsck_unlock(llh);
2172
2173 log:
2174         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found bad name "
2175                "entry for: parent "DFID", child "DFID", name %s, type "
2176                "in name entry %o, type claimed by child %o. repair it "
2177                "by %s with new name2 %s: rc = %d\n",
2178                lfsck_lfsck2name(lfsck), PFID(pfid), PFID(&cfid),
2179                name, type, update ? lfsck_object_type(child) : 0,
2180                update ? "updating" : "removing", name2, rc);
2181
2182         if (rc != 0) {
2183                 struct lfsck_namespace *ns = com->lc_file_ram;
2184
2185                 ns->ln_flags |= LF_INCONSISTENT;
2186         }
2187
2188         return rc;
2189 }
2190
2191 /**
2192  * Update the ".." name entry for the given object.
2193  *
2194  * The object's ".." is corrupted, this function will update the ".." name
2195  * entry with the given pfid, and the linkEA with the given ldata.
2196  *
2197  * The caller should take the ldlm lock before the calling.
2198  *
2199  * \param[in] env       pointer to the thread context
2200  * \param[in] com       pointer to the lfsck component
2201  * \param[in] obj       pointer to the dt_object to be handled
2202  * \param[in] pfid      the new fid for the object's ".." name entry
2203  * \param[in] cname     the name for the @obj in the parent directory
2204  *
2205  * \retval              positive number for repaired cases
2206  * \retval              0 if nothing to be repaired
2207  * \retval              negative error number on failure
2208  */
2209 static int lfsck_namespace_repair_unmatched_pairs(const struct lu_env *env,
2210                                                   struct lfsck_component *com,
2211                                                   struct dt_object *obj,
2212                                                   const struct lu_fid *pfid,
2213                                                   struct lu_name *cname)
2214 {
2215         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2216         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
2217         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2218         struct dt_device                *dev    = lfsck_obj2dev(obj);
2219         struct thandle                  *th     = NULL;
2220         struct linkea_data               ldata  = { NULL };
2221         struct lu_buf                    linkea_buf;
2222         int                              rc     = 0;
2223         ENTRY;
2224
2225         LASSERT(!dt_object_remote(obj));
2226         LASSERT(S_ISDIR(lfsck_object_type(obj)));
2227
2228         rc = linkea_links_new(&ldata, &info->lti_big_buf, cname, pfid);
2229         if (rc != 0)
2230                 GOTO(log, rc);
2231
2232         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
2233                        ldata.ld_leh->leh_len);
2234
2235         th = dt_trans_create(env, dev);
2236         if (IS_ERR(th))
2237                 GOTO(log, rc = PTR_ERR(th));
2238
2239         rc = dt_declare_delete(env, obj, (const struct dt_key *)dotdot, th);
2240         if (rc != 0)
2241                 GOTO(stop, rc);
2242
2243         rec->rec_type = S_IFDIR;
2244         rec->rec_fid = pfid;
2245         rc = dt_declare_insert(env, obj, (const struct dt_rec *)rec,
2246                                (const struct dt_key *)dotdot, th);
2247         if (rc != 0)
2248                 GOTO(stop, rc);
2249
2250         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
2251                                   XATTR_NAME_LINK, 0, th);
2252         if (rc != 0)
2253                 GOTO(stop, rc);
2254
2255         rc = dt_trans_start_local(env, dev, th);
2256         if (rc != 0)
2257                 GOTO(stop, rc);
2258
2259         dt_write_lock(env, obj, 0);
2260         if (unlikely(lfsck_is_dead_obj(obj)))
2261                 GOTO(unlock, rc = 0);
2262
2263         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2264                 GOTO(unlock, rc = 1);
2265
2266         /* The old ".." name entry maybe not exist. */
2267         dt_delete(env, obj, (const struct dt_key *)dotdot, th);
2268
2269         rc = dt_insert(env, obj, (const struct dt_rec *)rec,
2270                        (const struct dt_key *)dotdot, th);
2271         if (rc != 0)
2272                 GOTO(unlock, rc);
2273
2274         rc = lfsck_links_write(env, obj, &ldata, th);
2275
2276         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2277
2278 unlock:
2279         dt_write_unlock(env, obj);
2280
2281 stop:
2282         dt_trans_stop(env, dev, th);
2283
2284 log:
2285         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild dotdot name entry for "
2286                "the object "DFID", new parent "DFID": rc = %d\n",
2287                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)),
2288                PFID(pfid), rc);
2289
2290         if (rc != 0) {
2291                 struct lfsck_namespace *ns = com->lc_file_ram;
2292
2293                 ns->ln_flags |= LF_INCONSISTENT;
2294         }
2295
2296         return rc;
2297 }
2298
2299 /**
2300  * Handle orphan @obj during Double Scan Directory.
2301  *
2302  * Remove the @obj's current (invalid) linkEA entries, and insert
2303  * it in the directory .lustre/lost+found/MDTxxxx/ with the name:
2304  * ${FID}-${PFID}-D-${conflict_version}
2305  *
2306  * The caller should take the ldlm lock before the calling.
2307  *
2308  * \param[in] env       pointer to the thread context
2309  * \param[in] com       pointer to the lfsck component
2310  * \param[in] obj       pointer to the orphan object to be handled
2311  * \param[in] pfid      the new fid for the object's ".." name entry
2312  * \param[in,out] lh    ldlm lock handler for the given @obj
2313  * \param[out] type     to tell the caller what the inconsistency is
2314  *
2315  * \retval              positive number for repaired cases
2316  * \retval              0 if nothing to be repaired
2317  * \retval              negative error number on failure
2318  */
2319 static int
2320 lfsck_namespace_dsd_orphan(const struct lu_env *env,
2321                            struct lfsck_component *com,
2322                            struct dt_object *obj,
2323                            const struct lu_fid *pfid,
2324                            struct lustre_handle *lh,
2325                            enum lfsck_namespace_inconsistency_type *type)
2326 {
2327         struct lfsck_thread_info *info = lfsck_env_info(env);
2328         struct lfsck_namespace   *ns   = com->lc_file_ram;
2329         int                       rc;
2330         ENTRY;
2331
2332         /* Remove the unrecognized linkEA. */
2333         rc = lfsck_namespace_links_remove(env, com, obj);
2334         lfsck_ibits_unlock(lh, LCK_EX);
2335         if (rc < 0 && rc != -ENODATA)
2336                 RETURN(rc);
2337
2338         *type = LNIT_MUL_REF;
2339
2340         /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT has
2341          * ever tried to verify some remote MDT-object that resides on this
2342          * MDT, but this MDT failed to respond such request. So means there
2343          * may be some remote name entry on other MDT that references this
2344          * object with another name, so we cannot know whether this linkEA
2345          * is valid or not. So keep it there and maybe resolved when next
2346          * LFSCK run. */
2347         if (ns->ln_flags & LF_INCOMPLETE)
2348                 RETURN(0);
2349
2350         /* The unique linkEA is invalid, even if the ".." name entry may be
2351          * valid, we still cannot know via which name entry this directory
2352          * will be referenced. Then handle it as pure orphan. */
2353         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2354                  "-"DFID, PFID(pfid));
2355         rc = lfsck_namespace_insert_orphan(env, com, obj,
2356                                            info->lti_tmpbuf, "D", NULL);
2357
2358         RETURN(rc);
2359 }
2360
2361 /**
2362  * Double Scan Directory object for single linkEA entry case.
2363  *
2364  * The given @child has unique linkEA entry. If the linkEA entry is valid,
2365  * then check whether the name is in the namespace or not, if not, add the
2366  * missing name entry back to namespace. If the linkEA entry is invalid,
2367  * then remove it and insert the @child in the .lustre/lost+found/MDTxxxx/
2368  * as an orphan.
2369  *
2370  * \param[in] env       pointer to the thread context
2371  * \param[in] com       pointer to the lfsck component
2372  * \param[in] child     pointer to the directory to be double scanned
2373  * \param[in] pfid      the FID corresponding to the ".." entry
2374  * \param[in] ldata     pointer to the linkEA data for the given @child
2375  * \param[in,out] lh    ldlm lock handler for the given @child
2376  * \param[out] type     to tell the caller what the inconsistency is
2377  * \param[in] retry     if found inconsistency, but the caller does not hold
2378  *                      ldlm lock on the @child, then set @retry as true
2379  * \param[in] unknown   set if does not know how to repair the inconsistency
2380  *
2381  * \retval              positive number for repaired cases
2382  * \retval              0 if nothing to be repaired
2383  * \retval              negative error number on failure
2384  */
2385 static int
2386 lfsck_namespace_dsd_single(const struct lu_env *env,
2387                            struct lfsck_component *com,
2388                            struct dt_object *child,
2389                            const struct lu_fid *pfid,
2390                            struct linkea_data *ldata,
2391                            struct lustre_handle *lh,
2392                            enum lfsck_namespace_inconsistency_type *type,
2393                            bool *retry, bool *unknown)
2394 {
2395         struct lfsck_thread_info *info          = lfsck_env_info(env);
2396         struct lu_name           *cname         = &info->lti_name;
2397         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2398         struct lu_fid             tfid;
2399         struct lfsck_namespace   *ns            = com->lc_file_ram;
2400         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2401         struct dt_object         *parent        = NULL;
2402         struct lmv_mds_md_v1     *lmv;
2403         int                       rc            = 0;
2404         ENTRY;
2405
2406         rc = lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid,
2407                                                  info->lti_key,
2408                                                  sizeof(info->lti_key));
2409         /* The unique linkEA entry with bad parent will be handled as orphan. */
2410         if (rc != 0) {
2411                 if (!lustre_handle_is_used(lh) && retry != NULL)
2412                         *retry = true;
2413                 else
2414                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2415                                                         pfid, lh, type);
2416
2417                 GOTO(out, rc);
2418         }
2419
2420         parent = lfsck_object_find_bottom(env, lfsck, &tfid);
2421         if (IS_ERR(parent))
2422                 GOTO(out, rc = PTR_ERR(parent));
2423
2424         /* We trust the unique linkEA entry in spite of whether it matches the
2425          * ".." name entry or not. Because even if the linkEA entry is wrong
2426          * and the ".." name entry is right, we still cannot know via which
2427          * name entry the child will be referenced, since all known entries
2428          * have been verified during the first-stage scanning. */
2429         if (!dt_object_exists(parent)) {
2430                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT
2431                  * has ever tried to verify some remote MDT-object that resides
2432                  * on this MDT, but this MDT failed to respond such request. So
2433                  * means there may be some remote name entry on other MDT that
2434                  * references this object with another name, so we cannot know
2435                  * whether this linkEA is valid or not. So keep it there and
2436                  * maybe resolved when next LFSCK run. */
2437                 if (ns->ln_flags & LF_INCOMPLETE)
2438                         GOTO(out, rc = 0);
2439
2440                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2441                         *retry = true;
2442
2443                         GOTO(out, rc = 0);
2444                 }
2445
2446                 lfsck_ibits_unlock(lh, LCK_EX);
2447
2448 lost_parent:
2449                 lmv = &info->lti_lmv;
2450                 rc = lfsck_read_stripe_lmv(env, lfsck, child, lmv);
2451                 if (rc != 0 && rc != -ENODATA)
2452                         GOTO(out, rc);
2453
2454                 if (rc == -ENODATA || lmv->lmv_magic != LMV_MAGIC_STRIPE) {
2455                         lmv = NULL;
2456                 } else if (lfsck_shard_name_to_index(env,
2457                                         cname->ln_name, cname->ln_namelen,
2458                                         S_IFDIR, cfid) < 0) {
2459                         /* It is an invalid name entry, we
2460                          * cannot trust the parent also. */
2461                         rc = lfsck_namespace_shrink_linkea(env, com, child,
2462                                                 ldata, cname, &tfid, true);
2463                         if (rc < 0)
2464                                 GOTO(out, rc);
2465
2466                         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2467                                  "-"DFID, PFID(pfid));
2468                         rc = lfsck_namespace_insert_orphan(env, com, child,
2469                                                 info->lti_tmpbuf, "S", NULL);
2470
2471                         GOTO(out, rc);
2472                 }
2473
2474                 /* Create the lost parent as an orphan. */
2475                 rc = lfsck_namespace_create_orphan_dir(env, com, parent, lmv);
2476                 if (rc >= 0) {
2477                         /* Add the missing name entry to the parent. */
2478                         rc = lfsck_namespace_insert_normal(env, com, parent,
2479                                                         child, cname->ln_name);
2480                         if (unlikely(rc == -EEXIST)) {
2481                                 /* Unfortunately, someone reused the name
2482                                  * under the parent by race. So we have
2483                                  * to remove the linkEA entry from
2484                                  * current child object. It means that the
2485                                  * LFSCK cannot recover the system
2486                                  * totally back to its original status,
2487                                  * but it is necessary to make the
2488                                  * current system to be consistent. */
2489                                 rc = lfsck_namespace_shrink_linkea(env,
2490                                                 com, child, ldata,
2491                                                 cname, &tfid, true);
2492                                 if (rc >= 0) {
2493                                         snprintf(info->lti_tmpbuf,
2494                                                  sizeof(info->lti_tmpbuf),
2495                                                  "-"DFID, PFID(pfid));
2496                                         rc = lfsck_namespace_insert_orphan(env,
2497                                                 com, child, info->lti_tmpbuf,
2498                                                 "D", NULL);
2499                                 }
2500                         }
2501                 }
2502
2503                 GOTO(out, rc);
2504         } /* !dt_object_exists(parent) */
2505
2506         /* The unique linkEA entry with bad parent will be handled as orphan. */
2507         if (unlikely(!dt_try_as_dir(env, parent))) {
2508                 if (!lustre_handle_is_used(lh) && retry != NULL)
2509                         *retry = true;
2510                 else
2511                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2512                                                         pfid, lh, type);
2513
2514                 GOTO(out, rc);
2515         }
2516
2517         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
2518                        (const struct dt_key *)cname->ln_name);
2519         if (rc == -ENOENT) {
2520                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT
2521                  * has ever tried to verify some remote MDT-object that resides
2522                  * on this MDT, but this MDT failed to respond such request. So
2523                  * means there may be some remote name entry on other MDT that
2524                  * references this object with another name, so we cannot know
2525                  * whether this linkEA is valid or not. So keep it there and
2526                  * maybe resolved when next LFSCK run. */
2527                 if (ns->ln_flags & LF_INCOMPLETE)
2528                         GOTO(out, rc = 0);
2529
2530                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2531                         *retry = true;
2532
2533                         GOTO(out, rc = 0);
2534                 }
2535
2536                 lfsck_ibits_unlock(lh, LCK_EX);
2537                 rc = lfsck_namespace_check_name(env, lfsck, parent, child,
2538                                                 cname);
2539                 if (rc == -ENOENT)
2540                         goto lost_parent;
2541
2542                 if (rc < 0)
2543                         GOTO(out, rc);
2544
2545                 /* It is an invalid name entry, drop it. */
2546                 if (unlikely(rc > 0)) {
2547                         rc = lfsck_namespace_shrink_linkea(env, com, child,
2548                                                 ldata, cname, &tfid, true);
2549                         if (rc >= 0) {
2550                                 snprintf(info->lti_tmpbuf,
2551                                          sizeof(info->lti_tmpbuf),
2552                                          "-"DFID, PFID(pfid));
2553                                 rc = lfsck_namespace_insert_orphan(env, com,
2554                                         child, info->lti_tmpbuf, "D", NULL);
2555                         }
2556
2557                         GOTO(out, rc);
2558                 }
2559
2560                 /* Add the missing name entry back to the namespace. */
2561                 rc = lfsck_namespace_insert_normal(env, com, parent, child,
2562                                                    cname->ln_name);
2563                 if (unlikely(rc == -ESTALE))
2564                         /* It may happen when the remote object has been
2565                          * removed, but the local MDT is not aware of that. */
2566                         goto lost_parent;
2567
2568                 if (unlikely(rc == -EEXIST)) {
2569                         /* Unfortunately, someone reused the name under the
2570                          * parent by race. So we have to remove the linkEA
2571                          * entry from current child object. It means that the
2572                          * LFSCK cannot recover the system totally back to
2573                          * its original status, but it is necessary to make
2574                          * the current system to be consistent.
2575                          *
2576                          * It also may be because of the LFSCK found some
2577                          * internal status of create operation. Under such
2578                          * case, nothing to be done. */
2579                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
2580                                         parent, child, ldata, cname, &tfid);
2581                         if (rc >= 0) {
2582                                 snprintf(info->lti_tmpbuf,
2583                                          sizeof(info->lti_tmpbuf),
2584                                          "-"DFID, PFID(pfid));
2585                                 rc = lfsck_namespace_insert_orphan(env, com,
2586                                         child, info->lti_tmpbuf, "D", NULL);
2587                         }
2588                 }
2589
2590                 GOTO(out, rc);
2591         } /* rc == -ENOENT */
2592
2593         if (rc != 0)
2594                 GOTO(out, rc);
2595
2596         if (!lu_fid_eq(&tfid, cfid)) {
2597                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2598                         *retry = true;
2599
2600                         GOTO(out, rc = 0);
2601                 }
2602
2603                 lfsck_ibits_unlock(lh, LCK_EX);
2604                 /* The name entry references another MDT-object that
2605                  * may be created by the LFSCK for repairing dangling
2606                  * name entry. Try to replace it. */
2607                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
2608                                                   &tfid, cname);
2609                 if (rc == 0)
2610                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2611                                                         pfid, lh, type);
2612
2613                 GOTO(out, rc);
2614         }
2615
2616         /* Zero FID may because the remote directroy object has invalid linkEA,
2617          * or lost linkEA. Under such case, the LFSCK on this MDT does not know
2618          * how to repair the inconsistency, but the namespace LFSCK on the MDT
2619          * where its name entry resides may has more information (name, FID) to
2620          * repair such inconsistency. So here, keep the inconsistency to avoid
2621          * some imporper repairing. */
2622         if (fid_is_zero(pfid)) {
2623                 if (unknown)
2624                         *unknown = true;
2625
2626                 GOTO(out, rc = 0);
2627         }
2628
2629         /* The ".." name entry is wrong, update it. */
2630         if (!lu_fid_eq(pfid, lfsck_dto2fid(parent))) {
2631                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2632                         *retry = true;
2633
2634                         GOTO(out, rc = 0);
2635                 }
2636
2637                 *type = LNIT_UNMATCHED_PAIRS;
2638                 rc = lfsck_namespace_repair_unmatched_pairs(env, com, child,
2639                                                 lfsck_dto2fid(parent), cname);
2640         }
2641
2642         GOTO(out, rc);
2643
2644 out:
2645         if (parent != NULL && !IS_ERR(parent))
2646                 lfsck_object_put(env, parent);
2647
2648         return rc;
2649 }
2650
2651 /**
2652  * Double Scan Directory object for multiple linkEA entries case.
2653  *
2654  * The given @child has multiple linkEA entries. There is at most one linkEA
2655  * entry will be valid, all the others will be removed. Firstly, the function
2656  * will try to find out the linkEA entry for which the name entry exists under
2657  * the given parent (@pfid). If there is no linkEA entry that matches the given
2658  * ".." name entry, then tries to find out the first linkEA entry that both the
2659  * parent and the name entry exist to rebuild a new ".." name entry.
2660  *
2661  * \param[in] env       pointer to the thread context
2662  * \param[in] com       pointer to the lfsck component
2663  * \param[in] child     pointer to the directory to be double scanned
2664  * \param[in] pfid      the FID corresponding to the ".." entry
2665  * \param[in] ldata     pointer to the linkEA data for the given @child
2666  * \param[in,out] lh    ldlm lock handler for the given @child
2667  * \param[out] type     to tell the caller what the inconsistency is
2668  * \param[in] lpf       true if the ".." entry is under lost+found/MDTxxxx/
2669  * \param[in] unknown   set if does not know how to repair the inconsistency
2670  *
2671  * \retval              positive number for repaired cases
2672  * \retval              0 if nothing to be repaired
2673  * \retval              negative error number on failure
2674  */
2675 static int
2676 lfsck_namespace_dsd_multiple(const struct lu_env *env,
2677                              struct lfsck_component *com,
2678                              struct dt_object *child,
2679                              const struct lu_fid *pfid,
2680                              struct linkea_data *ldata,
2681                              struct lustre_handle *lh,
2682                              enum lfsck_namespace_inconsistency_type *type,
2683                              bool lpf, bool *unknown)
2684 {
2685         struct lfsck_thread_info *info          = lfsck_env_info(env);
2686         struct lu_name           *cname         = &info->lti_name;
2687         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2688         struct lu_fid            *pfid2         = &info->lti_fid3;
2689         struct lu_fid             tfid;
2690         struct lfsck_namespace   *ns            = com->lc_file_ram;
2691         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2692         struct lfsck_bookmark    *bk            = &lfsck->li_bookmark_ram;
2693         struct dt_object         *parent        = NULL;
2694         struct linkea_data        ldata_new     = { NULL };
2695         int                       dirent_count  = 0;
2696         int                       rc            = 0;
2697         bool                      once          = true;
2698         ENTRY;
2699
2700 again:
2701         while (ldata->ld_lee != NULL) {
2702                 rc = lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid,
2703                                                          info->lti_key,
2704                                                          sizeof(info->lti_key));
2705                 /* Drop invalid linkEA entry. */
2706                 if (rc != 0) {
2707                         lfsck_linkea_del_buf(ldata, cname);
2708                         continue;
2709                 }
2710
2711                 /* Drop repeated linkEA entries. */
2712                 lfsck_namespace_filter_linkea_entry(ldata, cname, &tfid, true);
2713
2714                 /* If current dotdot is the .lustre/lost+found/MDTxxxx/,
2715                  * then it is possible that: the directry object has ever
2716                  * been lost, but its name entry was there. In the former
2717                  * LFSCK run, during the first-stage scanning, the LFSCK
2718                  * found the dangling name entry, but it did not recreate
2719                  * the lost object, and when moved to the second-stage
2720                  * scanning, some children objects of the lost directory
2721                  * object were found, then the LFSCK recreated such lost
2722                  * directory object as an orphan.
2723                  *
2724                  * When the LFSCK runs again, if the dangling name is still
2725                  * there, the LFSCK should move the orphan directory object
2726                  * back to the normal namespace. */
2727                 if (!lpf && !fid_is_zero(pfid) &&
2728                     !lu_fid_eq(pfid, &tfid) && once) {
2729                         linkea_next_entry(ldata);
2730                         continue;
2731                 }
2732
2733                 parent = lfsck_object_find_bottom(env, lfsck, &tfid);
2734                 if (IS_ERR(parent))
2735                         RETURN(PTR_ERR(parent));
2736
2737                 if (!dt_object_exists(parent)) {
2738                         lfsck_object_put(env, parent);
2739                         if (ldata->ld_leh->leh_reccount > 1) {
2740                                 /* If it is NOT the last linkEA entry, then
2741                                  * there is still other chance to make the
2742                                  * child to be visible via other parent, then
2743                                  * remove this linkEA entry. */
2744                                 lfsck_linkea_del_buf(ldata, cname);
2745                                 continue;
2746                         }
2747
2748                         break;
2749                 }
2750
2751                 /* The linkEA entry with bad parent will be removed. */
2752                 if (unlikely(!dt_try_as_dir(env, parent))) {
2753                         lfsck_object_put(env, parent);
2754                         lfsck_linkea_del_buf(ldata, cname);
2755                         continue;
2756                 }
2757
2758                 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
2759                                (const struct dt_key *)cname->ln_name);
2760                 *pfid2 = *lfsck_dto2fid(parent);
2761                 if (rc == -ENOENT) {
2762                         lfsck_object_put(env, parent);
2763                         linkea_next_entry(ldata);
2764                         continue;
2765                 }
2766
2767                 if (rc != 0) {
2768                         lfsck_object_put(env, parent);
2769
2770                         RETURN(rc);
2771                 }
2772
2773                 if (lu_fid_eq(&tfid, cfid)) {
2774                         lfsck_object_put(env, parent);
2775                         /* If the parent (that is declared via linkEA entry)
2776                          * directory contains the specified child, but such
2777                          * parent does not match the dotdot name entry, then
2778                          * trust the linkEA. */
2779                         if (!fid_is_zero(pfid) && !lu_fid_eq(pfid, pfid2)) {
2780                                 *type = LNIT_UNMATCHED_PAIRS;
2781                                 rc = lfsck_namespace_repair_unmatched_pairs(env,
2782                                                 com, child, pfid2, cname);
2783
2784                                 RETURN(rc);
2785                         }
2786
2787 rebuild:
2788                         /* It is the most common case that we find the
2789                          * name entry corresponding to the linkEA entry
2790                          * that matches the ".." name entry. */
2791                         rc = linkea_links_new(&ldata_new, &info->lti_big_buf,
2792                                               cname, pfid2);
2793                         if (rc != 0)
2794                                 RETURN(rc);
2795
2796                         rc = lfsck_namespace_rebuild_linkea(env, com, child,
2797                                                             &ldata_new);
2798                         if (rc < 0)
2799                                 RETURN(rc);
2800
2801                         lfsck_linkea_del_buf(ldata, cname);
2802                         linkea_first_entry(ldata);
2803                         /* There may be some invalid dangling name entries under
2804                          * other parent directories, remove all of them. */
2805                         while (ldata->ld_lee != NULL) {
2806                                 rc = lfsck_namespace_unpack_linkea_entry(ldata,
2807                                                 cname, &tfid, info->lti_key,
2808                                                 sizeof(info->lti_key));
2809                                 if (rc != 0)
2810                                         goto next;
2811
2812                                 parent = lfsck_object_find_bottom(env, lfsck,
2813                                                                   &tfid);
2814                                 if (IS_ERR(parent)) {
2815                                         rc = PTR_ERR(parent);
2816                                         if (rc != -ENOENT &&
2817                                             bk->lb_param & LPF_FAILOUT)
2818                                                 RETURN(rc);
2819
2820                                         goto next;
2821                                 }
2822
2823                                 if (!dt_object_exists(parent)) {
2824                                         lfsck_object_put(env, parent);
2825                                         goto next;
2826                                 }
2827
2828                                 rc = lfsck_namespace_repair_dirent(env, com,
2829                                         parent, child, cname->ln_name,
2830                                         cname->ln_name, S_IFDIR, false, true);
2831                                 lfsck_object_put(env, parent);
2832                                 if (rc < 0) {
2833                                         if (bk->lb_param & LPF_FAILOUT)
2834                                                 RETURN(rc);
2835
2836                                         goto next;
2837                                 }
2838
2839                                 dirent_count += rc;
2840
2841 next:
2842                                 lfsck_linkea_del_buf(ldata, cname);
2843                         }
2844
2845                         ns->ln_dirent_repaired += dirent_count;
2846
2847                         RETURN(rc);
2848                 } /* lu_fid_eq(&tfid, lfsck_dto2fid(child)) */
2849
2850                 lfsck_ibits_unlock(lh, LCK_EX);
2851                 /* The name entry references another MDT-object that may be
2852                  * created by the LFSCK for repairing dangling name entry.
2853                  * Try to replace it. */
2854                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
2855                                                   &tfid, cname);
2856                 lfsck_object_put(env, parent);
2857                 if (rc < 0)
2858                         RETURN(rc);
2859
2860                 if (rc > 0)
2861                         goto rebuild;
2862
2863                 lfsck_linkea_del_buf(ldata, cname);
2864         } /* while (ldata->ld_lee != NULL) */
2865
2866         /* If there is still linkEA overflow, return. */
2867         if (unlikely(ldata->ld_leh->leh_overflow_time))
2868                 RETURN(0);
2869
2870         linkea_first_entry(ldata);
2871         if (ldata->ld_leh->leh_reccount == 1) {
2872                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, ldata,
2873                                                 lh, type, NULL, unknown);
2874
2875                 RETURN(rc);
2876         }
2877
2878         /* All linkEA entries are invalid and removed, then handle the @child
2879          * as an orphan.*/
2880         if (ldata->ld_leh->leh_reccount == 0) {
2881                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, lh,
2882                                                 type);
2883
2884                 RETURN(rc);
2885         }
2886
2887         /* If the dangling name entry for the orphan directory object has
2888          * been remvoed, then just check whether the directory object is
2889          * still under the .lustre/lost+found/MDTxxxx/ or not. */
2890         if (lpf) {
2891                 lpf = false;
2892                 goto again;
2893         }
2894
2895         /* There is no linkEA entry that matches the ".." name entry. Find
2896          * the first linkEA entry that both parent and name entry exist to
2897          * rebuild a new ".." name entry. */
2898         if (once) {
2899                 once = false;
2900                 goto again;
2901         }
2902
2903         RETURN(rc);
2904 }
2905
2906 /**
2907  * Repair the object's nlink attribute.
2908  *
2909  * If all the known name entries have been verified, then the object's hard
2910  * link attribute should match the object's linkEA entries count unless the
2911  * object's has too many hard link to be recorded in the linkEA. Such cases
2912  * should have been marked in the LFSCK trace file. Otherwise, trust the
2913  * linkEA to update the object's nlink attribute.
2914  *
2915  * \param[in] env       pointer to the thread context
2916  * \param[in] com       pointer to the lfsck component
2917  * \param[in] obj       pointer to the dt_object to be handled
2918  * \param[in,out] la    pointer to buffer to object's attribute before
2919  *                      and after the repairing
2920  *
2921  * \retval              positive number for repaired cases
2922  * \retval              0 if nothing to be repaired
2923  * \retval              negative error number on failure
2924  */
2925 static int lfsck_namespace_repair_nlink(const struct lu_env *env,
2926                                         struct lfsck_component *com,
2927                                         struct dt_object *obj,
2928                                         struct lu_attr *la)
2929 {
2930         struct lfsck_namespace          *ns     = com->lc_file_ram;
2931         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2932         struct dt_device                *dev    = lfsck_obj2dev(obj);
2933         const struct lu_fid             *cfid   = lfsck_dto2fid(obj);
2934         struct thandle                  *th     = NULL;
2935         struct linkea_data               ldata  = { NULL };
2936         struct lustre_handle             lh     = { 0 };
2937         __u32                            old    = la->la_nlink;
2938         int                              rc     = 0;
2939         ENTRY;
2940
2941         LASSERT(!dt_object_remote(obj));
2942
2943         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
2944                               MDS_INODELOCK_UPDATE, LCK_PW);
2945         if (rc != 0)
2946                 GOTO(log, rc);
2947
2948         th = dt_trans_create(env, dev);
2949         if (IS_ERR(th))
2950                 GOTO(log, rc = PTR_ERR(th));
2951
2952         la->la_valid = LA_NLINK;
2953         rc = dt_declare_attr_set(env, obj, la, th);
2954         if (rc != 0)
2955                 GOTO(stop, rc);
2956
2957         rc = dt_trans_start_local(env, dev, th);
2958         if (rc != 0)
2959                 GOTO(stop, rc);
2960
2961         dt_write_lock(env, obj, 0);
2962         /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT has
2963          * ever tried to verify some remote MDT-object that resides on this
2964          * MDT, but this MDT failed to respond such request. So means there
2965          * may be some remote name entry on other MDT that references this
2966          * object with another name, so we cannot know whether this linkEA
2967          * is valid or not. So keep it there and maybe resolved when next
2968          * LFSCK run. */
2969         if (ns->ln_flags & LF_INCOMPLETE)
2970                 GOTO(unlock, rc = 0);
2971
2972         rc = dt_attr_get(env, obj, la);
2973         if (rc != 0)
2974                 GOTO(unlock, rc = (rc == -ENOENT ? 0 : rc));
2975
2976         rc = lfsck_links_read2_with_rec(env, obj, &ldata);
2977         if (rc)
2978                 GOTO(unlock, rc = (rc == -ENODATA ? 0 : rc));
2979
2980         /* XXX: Currently, we only update the nlink attribute if the known
2981          *      linkEA entries is larger than the nlink attribute. That is
2982          *      safe action. */
2983         if (la->la_nlink >= ldata.ld_leh->leh_reccount ||
2984             unlikely(la->la_nlink == 0 ||
2985                      ldata.ld_leh->leh_overflow_time))
2986                 GOTO(unlock, rc = 0);
2987
2988         la->la_nlink = ldata.ld_leh->leh_reccount;
2989         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2990                 GOTO(unlock, rc = 1);
2991
2992         rc = dt_attr_set(env, obj, la, th);
2993
2994         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2995
2996 unlock:
2997         dt_write_unlock(env, obj);
2998
2999 stop:
3000         dt_trans_stop(env, dev, th);
3001
3002 log:
3003         lfsck_ibits_unlock(&lh, LCK_PW);
3004         CDEBUG(D_LFSCK, "%s: namespace LFSCK repaired the object "DFID"'s "
3005                "nlink count from %u to %u: rc = %d\n",
3006                lfsck_lfsck2name(lfsck), PFID(cfid), old, la->la_nlink, rc);
3007
3008         if (rc != 0)
3009                 ns->ln_flags |= LF_INCONSISTENT;
3010
3011         return rc;
3012 }
3013
3014 /**
3015  * Double scan the directory object for namespace LFSCK.
3016  *
3017  * This function will verify the <parent, child> pairs in the namespace tree:
3018  * the parent references the child via some name entry that should be in the
3019  * child's linkEA entry, the child should back references the parent via its
3020  * ".." name entry.
3021  *
3022  * The LFSCK will scan every linkEA entry in turn until find out the first
3023  * matched pairs. If found, then all other linkEA entries will be dropped.
3024  * If all the linkEA entries cannot match the ".." name entry, then there
3025  * are serveral possible cases:
3026  *
3027  * 1) If there is only one linkEA entry, then trust it as long as the PFID
3028  *    in the linkEA entry is valid.
3029  *
3030  * 2) If there are multiple linkEA entries, then try to find the linkEA
3031  *    that matches the ".." name entry. If found, then all other entries
3032  *    are invalid; otherwise, it is quite possible that the ".." name entry
3033  *    is corrupted. Under such case, the LFSCK will rebuild the ".." name
3034  *    entry according to the first valid linkEA entry (both the parent and
3035  *    the name entry should exist).
3036  *
3037  * 3) If the directory object has no (valid) linkEA entry, then the
3038  *    directory object will be handled as pure orphan and inserted
3039  *    in the .lustre/lost+found/MDTxxxx/ with the name:
3040  *    ${self_FID}-${PFID}-D-${conflict_version}
3041  *
3042  * \param[in] env       pointer to the thread context
3043  * \param[in] com       pointer to the lfsck component
3044  * \param[in] child     pointer to the directory object to be handled
3045  * \param[in] flags     to indicate the specical checking on the @child
3046  *
3047  * \retval              positive number for repaired cases
3048  * \retval              0 if nothing to be repaired
3049  * \retval              negative error number on failure
3050  */
3051 static int lfsck_namespace_double_scan_dir(const struct lu_env *env,
3052                                            struct lfsck_component *com,
3053                                            struct dt_object *child, __u8 flags)
3054 {
3055         struct lfsck_thread_info *info          = lfsck_env_info(env);
3056         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
3057         struct lu_fid            *pfid          = &info->lti_fid2;
3058         struct lfsck_namespace   *ns            = com->lc_file_ram;
3059         struct lfsck_instance    *lfsck         = com->lc_lfsck;
3060         struct lustre_handle      lh            = { 0 };
3061         struct linkea_data        ldata         = { NULL };
3062         bool                      unknown       = false;
3063         bool                      lpf           = false;
3064         bool                      retry         = false;
3065         enum lfsck_namespace_inconsistency_type type = LNIT_BAD_LINKEA;
3066         int                       rc            = 0;
3067         ENTRY;
3068
3069         LASSERT(!dt_object_remote(child));
3070
3071         if (flags & LNTF_UNCERTAIN_LMV) {
3072                 if (flags & LNTF_RECHECK_NAME_HASH) {
3073                         rc = lfsck_namespace_scan_shard(env, com, child);
3074                         if (rc < 0)
3075                                 RETURN(rc);
3076
3077                         ns->ln_striped_shards_scanned++;
3078                 } else {
3079                         ns->ln_striped_shards_skipped++;
3080                 }
3081         }
3082
3083         flags &= ~(LNTF_RECHECK_NAME_HASH | LNTF_UNCERTAIN_LMV);
3084         if (flags == 0)
3085                 RETURN(0);
3086
3087         if (flags & (LNTF_CHECK_LINKEA | LNTF_CHECK_PARENT) &&
3088             !(lfsck->li_bookmark_ram.lb_param & LPF_ALL_TGT)) {
3089                 CDEBUG(D_LFSCK, "%s: some MDT(s) maybe NOT take part in the"
3090                        "the namespace LFSCK, then the LFSCK cannot guarantee"
3091                        "all the name entries have been verified in first-stage"
3092                        "scanning. So have to skip orphan related handling for"
3093                        "the directory object "DFID" with remote name entry\n",
3094                        lfsck_lfsck2name(lfsck), PFID(cfid));
3095
3096                 RETURN(0);
3097         }
3098
3099         if (unlikely(!dt_try_as_dir(env, child)))
3100                 GOTO(out, rc = -ENOTDIR);
3101
3102         /* We only take ldlm lock on the @child when required. When the
3103          * logic comes here for the first time, it is always false. */
3104         if (0) {
3105
3106 lock:
3107                 rc = lfsck_ibits_lock(env, lfsck, child, &lh,
3108                                       MDS_INODELOCK_UPDATE |
3109                                       MDS_INODELOCK_XATTR, LCK_EX);
3110                 if (rc != 0)
3111                         GOTO(out, rc);
3112         }
3113
3114         dt_read_lock(env, child, 0);
3115         if (unlikely(lfsck_is_dead_obj(child))) {
3116                 dt_read_unlock(env, child);
3117
3118                 GOTO(out, rc = 0);
3119         }
3120
3121         rc = dt_lookup(env, child, (struct dt_rec *)pfid,
3122                        (const struct dt_key *)dotdot);
3123         if (rc != 0) {
3124                 if (rc != -ENOENT && rc != -ENODATA && rc != -EINVAL) {
3125                         dt_read_unlock(env, child);
3126
3127                         GOTO(out, rc);
3128                 }
3129
3130                 if (!lustre_handle_is_used(&lh)) {
3131                         dt_read_unlock(env, child);
3132                         goto lock;
3133                 }
3134
3135                 fid_zero(pfid);
3136         } else if (lfsck->li_lpf_obj != NULL &&
3137                    lu_fid_eq(pfid, lfsck_dto2fid(lfsck->li_lpf_obj))) {
3138                 lpf = true;
3139         } else if (unlikely(!fid_is_sane(pfid))) {
3140                 fid_zero(pfid);
3141         }
3142
3143         rc = lfsck_links_read(env, child, &ldata);
3144         dt_read_unlock(env, child);
3145         if (rc != 0) {
3146                 if (rc != -ENODATA && rc != -EINVAL)
3147                         GOTO(out, rc);
3148
3149                 if (!lustre_handle_is_used(&lh))
3150                         goto lock;
3151
3152                 if (rc == -EINVAL && !fid_is_zero(pfid)) {
3153                         /* Remove the corrupted linkEA. */
3154                         rc = lfsck_namespace_links_remove(env, com, child);
3155                         if (rc == 0)
3156                                 /* Here, because of the crashed linkEA, we
3157                                  * cannot know whether there is some parent
3158                                  * that references the child directory via
3159                                  * some name entry or not. So keep it there,
3160                                  * when the LFSCK run next time, if there is
3161                                  * some parent that references this object,
3162                                  * then the LFSCK can rebuild the linkEA;
3163                                  * otherwise, this object will be handled
3164                                  * as orphan as above. */
3165                                 unknown = true;
3166                 } else {
3167                         /* 1. If we have neither ".." nor linkEA,
3168                          *    then it is an orphan.
3169                          *
3170                          * 2. If we only have the ".." name entry,
3171                          *    but no parent references this child
3172                          *    directory, then handle it as orphan. */
3173                         lfsck_ibits_unlock(&lh, LCK_EX);
3174                         type = LNIT_MUL_REF;
3175
3176                         /* If the LFSCK is marked as LF_INCOMPLETE,
3177                          * then means some MDT has ever tried to
3178                          * verify some remote MDT-object that resides
3179                          * on this MDT, but this MDT failed to respond
3180                          * such request. So means there may be some
3181                          * remote name entry on other MDT that
3182                          * references this object with another name,
3183                          * so we cannot know whether this linkEA is
3184                          * valid or not. So keep it there and maybe
3185                          * resolved when next LFSCK run. */
3186                         if (ns->ln_flags & LF_INCOMPLETE)
3187                                 GOTO(out, rc = 0);
3188
3189                         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
3190                                  "-"DFID, PFID(pfid));
3191                         rc = lfsck_namespace_insert_orphan(env, com, child,
3192                                                 info->lti_tmpbuf, "D", NULL);
3193                 }
3194
3195                 GOTO(out, rc);
3196         } /* rc != 0 */
3197
3198         linkea_first_entry(&ldata);
3199         /* This is the most common case: the object has unique linkEA entry. */
3200         if (ldata.ld_leh->leh_reccount == 1) {
3201                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, &ldata,
3202                                                 &lh, &type, &retry, &unknown);
3203                 if (retry) {
3204                         LASSERT(!lustre_handle_is_used(&lh));
3205
3206                         retry = false;
3207                         goto lock;
3208                 }
3209
3210                 GOTO(out, rc);
3211         }
3212
3213         if (!lustre_handle_is_used(&lh))
3214                 goto lock;
3215
3216         if (unlikely(ldata.ld_leh->leh_reccount == 0)) {
3217                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, &lh,
3218                                                 &type);
3219
3220                 GOTO(out, rc);
3221         }
3222
3223         /* When we come here, the cases usually like that:
3224          * 1) The directory object has a corrupted linkEA entry. During the
3225          *    first-stage scanning, the LFSCK cannot know such corruption,
3226          *    then it appends the right linkEA entry according to the found
3227          *    name entry after the bad one.
3228          *
3229          * 2) The directory object has a right linkEA entry. During the
3230          *    first-stage scanning, the LFSCK finds some bad name entry,
3231          *    but the LFSCK cannot aware that at that time, then it adds
3232          *    the bad linkEA entry for further processing. */
3233         rc = lfsck_namespace_dsd_multiple(env, com, child, pfid, &ldata,
3234                                           &lh, &type, lpf, &unknown);
3235
3236         GOTO(out, rc);
3237
3238 out:
3239         lfsck_ibits_unlock(&lh, LCK_EX);
3240         if (rc > 0) {
3241                 switch (type) {
3242                 case LNIT_BAD_LINKEA:
3243                         ns->ln_linkea_repaired++;
3244                         break;
3245                 case LNIT_UNMATCHED_PAIRS:
3246                         ns->ln_unmatched_pairs_repaired++;
3247                         break;
3248                 case LNIT_MUL_REF:
3249                         ns->ln_mul_ref_repaired++;
3250                         break;
3251                 default:
3252                         break;
3253                 }
3254         }
3255
3256         if (unknown)
3257                 ns->ln_unknown_inconsistency++;
3258
3259         return rc;
3260 }
3261
3262 static inline bool
3263 lfsck_namespace_linkea_stale_overflow(struct linkea_data *ldata,
3264                                       struct lfsck_namespace *ns)
3265 {
3266         /* Both the leh_overflow_time and ln_time_latest_reset are
3267          * local time based, so need NOT to care about clock drift
3268          * among the servers. */
3269         return ldata->ld_leh->leh_overflow_time &&
3270                ldata->ld_leh->leh_overflow_time < ns->ln_time_latest_reset;
3271 }
3272
3273 /**
3274  * Clear the object's linkEA overflow timestamp.
3275  *
3276  * If the MDT-object has too many hard links as to the linkEA cannot hold
3277  * all of them, then overflow timestamp will be set in the linkEA header.
3278  * If some hard links are removed after that, then it is possible to hold
3279  * other missed linkEA entries. If the namespace LFSCK have added all the
3280  * related linkEA entries, then it will remove the overflow timestamp.
3281  *
3282  * \param[in] env       pointer to the thread context
3283  * \param[in] com       pointer to the lfsck component
3284  * \param[in] ldata     pointer to the linkEA data for the given @obj
3285  * \param[in] obj       pointer to the dt_object to be handled
3286  *
3287  * \retval              positive number for repaired cases
3288  * \retval              0 if nothing to be repaired
3289  * \retval              negative error number on failure
3290  */
3291 static int lfsck_namespace_linkea_clear_overflow(const struct lu_env *env,
3292                                                  struct lfsck_component *com,
3293                                                  struct linkea_data *ldata,
3294                                                  struct dt_object *obj)
3295 {
3296         struct lfsck_namespace *ns = com->lc_file_ram;
3297         struct lfsck_instance *lfsck = com->lc_lfsck;
3298         struct dt_device *dev = lfsck_obj2dev(obj);
3299         struct thandle *th = NULL;
3300         struct lustre_handle lh = { 0 };
3301         struct lu_buf linkea_buf;
3302         int rc = 0;
3303         ENTRY;
3304
3305         LASSERT(!dt_object_remote(obj));
3306
3307         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
3308                               MDS_INODELOCK_UPDATE, LCK_PW);
3309         if (rc != 0)
3310                 GOTO(log, rc);
3311
3312         th = dt_trans_create(env, dev);
3313         if (IS_ERR(th))
3314                 GOTO(log, rc = PTR_ERR(th));
3315
3316         rc = dt_declare_xattr_set(env, obj,
3317                         lfsck_buf_get_const(env, NULL, MAX_LINKEA_SIZE),
3318                         XATTR_NAME_LINK, 0, th);
3319         if (rc != 0)
3320                 GOTO(stop, rc);
3321
3322         rc = dt_trans_start_local(env, dev, th);
3323         if (rc != 0)
3324                 GOTO(stop, rc);
3325
3326         dt_write_lock(env, obj, 0);
3327         rc = lfsck_links_read(env, obj, ldata);
3328         if (rc != 0)
3329                 GOTO(unlock, rc);
3330
3331         if (unlikely(!lfsck_namespace_linkea_stale_overflow(ldata, ns)))
3332                 GOTO(unlock, rc = 0);
3333
3334         ldata->ld_leh->leh_overflow_time = 0;
3335         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
3336                 GOTO(unlock, rc = 1);
3337
3338         /* If all known entries are in the linkEA, then the 'leh_reccount'
3339          * should NOT be zero. */
3340         LASSERT(ldata->ld_leh->leh_reccount > 0);
3341
3342         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
3343                        ldata->ld_leh->leh_len);
3344         rc = dt_xattr_set(env, obj, &linkea_buf, XATTR_NAME_LINK, 0, th);
3345         if (unlikely(rc == -ENOSPC))
3346                 rc = 0;
3347         else if (!rc)
3348                 rc = 1;
3349
3350         GOTO(unlock, rc);
3351
3352 unlock:
3353         dt_write_unlock(env, obj);
3354
3355 stop:
3356         dt_trans_stop(env, dev, th);
3357
3358 log:
3359         lfsck_ibits_unlock(&lh, LCK_PW);
3360         CDEBUG(D_LFSCK, "%s: clear linkea overflow timestamp for the object "
3361                DFID": rc = %d\n",
3362                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
3363
3364         return rc;
3365 }
3366
3367 /**
3368  * Verify the object's agent entry.
3369  *
3370  * If the object claims to have agent entry but the linkEA does not contain
3371  * remote parent, then remove the agent entry. Otherwise, if the object has
3372  * no agent entry but its linkEA contains remote parent, then will generate
3373  * agent entry for it.
3374  *
3375  * \param[in] env       pointer to the thread context
3376  * \param[in] com       pointer to the lfsck component
3377  * \param[in] obj       pointer to the dt_object to be handled
3378  *
3379  * \retval              positive number for repaired cases
3380  * \retval              0 if nothing to be repaired
3381  * \retval              negative error number on failure
3382  */
3383 static int lfsck_namespace_check_agent_entry(const struct lu_env *env,
3384                                              struct lfsck_component *com,
3385                                              struct dt_object *obj)
3386 {
3387         struct linkea_data ldata = { NULL };
3388         struct lfsck_thread_info *info = lfsck_env_info(env);
3389         struct lfsck_namespace *ns = com->lc_file_ram;
3390         struct lfsck_instance *lfsck = com->lc_lfsck;
3391         struct lu_fid *pfid = &info->lti_fid2;
3392         struct lu_name *cname = &info->lti_name;
3393         struct lu_seq_range *range = &info->lti_range;
3394         struct seq_server_site *ss = lfsck_dev_site(lfsck);
3395         __u32 idx = lfsck_dev_idx(lfsck);
3396         int rc;
3397         bool remote = false;
3398         ENTRY;
3399
3400         if (!(lfsck->li_bookmark_ram.lb_param & LPF_ALL_TGT))
3401                 RETURN(0);
3402
3403         rc = lfsck_links_read_with_rec(env, obj, &ldata);
3404         if (rc == -ENOENT || rc == -ENODATA)
3405                 RETURN(0);
3406
3407         if (rc && rc != -EINVAL)
3408                 GOTO(out, rc);
3409
3410         /* We check the agent entry again after verifying the linkEA
3411          * successfully. So invalid linkEA should be dryrun mode. */
3412         if (rc == -EINVAL || unlikely(!ldata.ld_leh->leh_reccount))
3413                 RETURN(0);
3414
3415         linkea_first_entry(&ldata);
3416         while (ldata.ld_lee != NULL && !remote) {
3417                 linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen,
3418                                     cname, pfid);
3419                 if (!linkea_entry_is_valid(&ldata, cname, pfid))
3420                         GOTO(out, rc = 0);
3421
3422                 fld_range_set_mdt(range);
3423                 rc = fld_server_lookup(env, ss->ss_server_fld,
3424                                        fid_seq(pfid), range);
3425                 if (rc)
3426                         GOTO(out, rc = (rc == -ENOENT ? 0 : rc));
3427
3428                 if (range->lsr_index != idx)
3429                         remote = true;
3430                 else
3431                         linkea_next_entry(&ldata);
3432         }
3433
3434         if ((lu_object_has_agent_entry(&obj->do_lu) && !remote) ||
3435             (!lu_object_has_agent_entry(&obj->do_lu) && remote)) {
3436                 struct dt_device *dev = lfsck_obj2dev(obj);
3437                 struct linkea_data ldata2 = { NULL };
3438                 struct lustre_handle lh = { 0 };
3439                 struct lu_buf linkea_buf;
3440                 struct thandle *handle;
3441
3442                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
3443                         GOTO(out, rc = 1);
3444
3445                 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
3446                                       MDS_INODELOCK_UPDATE |
3447                                       MDS_INODELOCK_XATTR, LCK_EX);
3448                 if (rc)
3449                         GOTO(out, rc);
3450
3451                 handle = dt_trans_create(env, dev);
3452                 if (IS_ERR(handle))
3453                         GOTO(unlock, rc = PTR_ERR(handle));
3454
3455                 lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
3456                                ldata.ld_leh->leh_len);
3457                 rc = dt_declare_xattr_set(env, obj, &linkea_buf,
3458                                 XATTR_NAME_LINK, LU_XATTR_REPLACE, handle);
3459                 if (rc)
3460                         GOTO(stop, rc);
3461
3462                 rc = dt_trans_start_local(env, dev, handle);
3463                 if (rc)
3464                         GOTO(stop, rc);
3465
3466                 dt_write_lock(env, obj, 0);
3467                 rc = lfsck_links_read2_with_rec(env, obj, &ldata2);
3468                 if (rc) {
3469                         if (rc == -ENOENT || rc == -ENODATA)
3470                                 rc = 0;
3471                         GOTO(unlock2, rc);
3472                 }
3473
3474                 /* If someone changed linkEA by race, then the agent
3475                  * entry will be updated by lower layer automatically. */
3476                 if (ldata.ld_leh->leh_len != ldata2.ld_leh->leh_len ||
3477                     memcmp(ldata.ld_buf->lb_buf, ldata2.ld_buf->lb_buf,
3478                            ldata.ld_leh->leh_len) != 0)
3479                         GOTO(unlock2, rc = 0);
3480
3481                 rc = dt_xattr_set(env, obj, &linkea_buf, XATTR_NAME_LINK,
3482                                   LU_XATTR_REPLACE, handle);
3483                 if (!rc)
3484                         rc = 1;
3485
3486                 GOTO(unlock2, rc);
3487
3488 unlock2:
3489                 dt_write_unlock(env, obj);
3490 stop:
3491                 dt_trans_stop(env, dev, handle);
3492 unlock:
3493                 lfsck_ibits_unlock(&lh, LCK_EX);
3494         }
3495
3496         GOTO(out, rc);
3497
3498 out:
3499         if (rc > 0)
3500                 ns->ln_agent_entries_repaired++;
3501         if (rc)
3502                 CDEBUG(D_LFSCK, "%s: repair agent entry for "DFID": rc = %d\n",
3503                        lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
3504         return rc;
3505 }
3506
3507 /**
3508  * Double scan the MDT-object for namespace LFSCK.
3509  *
3510  * If the MDT-object contains invalid or repeated linkEA entries, then drop
3511  * those entries from the linkEA; if the linkEA becomes empty or the object
3512  * has no linkEA, then it is an orphan and will be added into the directory
3513  * .lustre/lost+found/MDTxxxx/; if the remote parent is lost, then recreate
3514  * the remote parent; if the name entry corresponding to some linkEA entry
3515  * is lost, then add the name entry back to the namespace.
3516  *
3517  * \param[in] env       pointer to the thread context
3518  * \param[in] com       pointer to the lfsck component
3519  * \param[in] child     pointer to the dt_object to be handled
3520  * \param[in] flags     some hints to indicate how the @child should be handled
3521  *
3522  * \retval              positive number for repaired cases
3523  * \retval              0 if nothing to be repaired
3524  * \retval              negative error number on failure
3525  */
3526 static int lfsck_namespace_double_scan_one(const struct lu_env *env,
3527                                            struct lfsck_component *com,
3528                                            struct dt_object *child, __u8 flags)
3529 {
3530         struct lfsck_thread_info *info     = lfsck_env_info(env);
3531         struct lu_attr           *la       = &info->lti_la;
3532         struct lu_name           *cname    = &info->lti_name;
3533         struct lu_fid            *pfid     = &info->lti_fid;
3534         struct lu_fid            *cfid     = &info->lti_fid2;
3535         struct lfsck_instance    *lfsck    = com->lc_lfsck;
3536         struct lfsck_namespace   *ns       = com->lc_file_ram;
3537         struct dt_object         *parent   = NULL;
3538         struct linkea_data        ldata    = { NULL };
3539         bool                      repaired = false;
3540         int                       count    = 0;
3541         int                       rc;
3542         ENTRY;
3543
3544         dt_read_lock(env, child, 0);
3545         if (unlikely(lfsck_is_dead_obj(child))) {
3546                 dt_read_unlock(env, child);
3547
3548                 RETURN(0);
3549         }
3550
3551         if (S_ISDIR(lfsck_object_type(child))) {
3552                 dt_read_unlock(env, child);
3553                 rc = lfsck_namespace_double_scan_dir(env, com, child, flags);
3554                 if (!rc && flags & LNTF_CHECK_AGENT_ENTRY)
3555                         rc = lfsck_namespace_check_agent_entry(env, com, child);
3556
3557                 RETURN(rc);
3558         }
3559
3560         rc = lfsck_links_read(env, child, &ldata);
3561         dt_read_unlock(env, child);
3562
3563         if (rc == -EINVAL) {
3564                 struct lustre_handle lh = { 0 };
3565
3566                 rc = lfsck_ibits_lock(env, com->lc_lfsck, child, &lh,
3567                                       MDS_INODELOCK_UPDATE |
3568                                       MDS_INODELOCK_XATTR, LCK_EX);
3569                 if (rc == 0) {
3570                         rc = lfsck_namespace_links_remove(env, com, child);
3571                         lfsck_ibits_unlock(&lh, LCK_EX);
3572                 }
3573
3574                 GOTO(out, rc);
3575         }
3576
3577         if (rc != 0)
3578                 GOTO(out, rc);
3579
3580         if (!(ns->ln_flags & LF_INCOMPLETE) &&
3581             unlikely(lfsck_namespace_linkea_stale_overflow(&ldata, ns))) {
3582                 rc = lfsck_namespace_linkea_clear_overflow(env, com, &ldata,
3583                                                            child);
3584                 if (rc < 0)
3585                         GOTO(out, rc);
3586
3587                 if (rc > 0)
3588                         ns->ln_linkea_overflow_cleared++;
3589         }
3590
3591         linkea_first_entry(&ldata);
3592         while (ldata.ld_lee != NULL) {
3593                 rc = lfsck_namespace_unpack_linkea_entry(&ldata, cname, pfid,
3594                                                          info->lti_key,
3595                                                          sizeof(info->lti_key));
3596                 /* Invalid PFID in the linkEA entry. */
3597                 if (rc != 0) {
3598                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3599                                                 &ldata, cname, pfid, true);
3600                         if (rc < 0)
3601                                 GOTO(out, rc);
3602
3603                         if (rc > 0)
3604                                 repaired = true;
3605
3606                         continue;
3607                 }
3608
3609                 rc = lfsck_namespace_filter_linkea_entry(&ldata, cname, pfid,
3610                                                          false);
3611                 /* Found repeated linkEA entries */
3612                 if (rc > 0) {
3613                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3614                                                 &ldata, cname, pfid, false);
3615                         if (rc < 0)
3616                                 GOTO(out, rc);
3617
3618                         if (rc == 0)
3619                                 continue;
3620
3621                         repaired = true;
3622
3623                         /* fall through */
3624                 }
3625
3626                 parent = lfsck_object_find_bottom(env, lfsck, pfid);
3627                 if (IS_ERR(parent))
3628                         GOTO(out, rc = PTR_ERR(parent));
3629
3630                 if (!dt_object_exists(parent)) {
3631
3632 lost_parent:
3633                         if (ldata.ld_leh->leh_reccount > 1) {
3634                                 /* If it is NOT the last linkEA entry, then
3635                                  * there is still other chance to make the
3636                                  * child to be visible via other parent, then
3637                                  * remove this linkEA entry. */
3638                                 rc = lfsck_namespace_shrink_linkea(env, com,
3639                                         child, &ldata, cname, pfid, true);
3640                         } else {
3641                                 /* If the LFSCK is marked as LF_INCOMPLETE,
3642                                  * then means some MDT has ever tried to
3643                                  * verify some remote MDT-object that resides
3644                                  * on this MDT, but this MDT failed to respond
3645                                  * such request. So means there may be some
3646                                  * remote name entry on other MDT that
3647                                  * references this object with another name,
3648                                  * so we cannot know whether this linkEA is
3649                                  * valid or not. So keep it there and maybe
3650                                  * resolved when next LFSCK run. */
3651                                 if (ns->ln_flags & LF_INCOMPLETE) {
3652                                         lfsck_object_put(env, parent);
3653
3654                                         GOTO(out, rc = 0);
3655                                 }
3656
3657                                 /* Create the lost parent as an orphan. */
3658                                 rc = lfsck_namespace_create_orphan_dir(env, com,
3659                                                                 parent, NULL);
3660                                 if (rc < 0) {
3661                                         lfsck_object_put(env, parent);
3662
3663                                         GOTO(out, rc);
3664                                 }
3665
3666                                 if (rc > 0)
3667                                         repaired = true;
3668
3669                                 /* Add the missing name entry to the parent. */
3670                                 rc = lfsck_namespace_insert_normal(env, com,
3671                                                 parent, child, cname->ln_name);
3672                                 if (unlikely(rc == -EEXIST))
3673                                         /* Unfortunately, someone reused the
3674                                          * name under the parent by race. So we
3675                                          * have to remove the linkEA entry from
3676                                          * current child object. It means that
3677                                          * the LFSCK cannot recover the system
3678                                          * totally back to its original status,
3679                                          * but it is necessary to make the
3680                                          * current system to be consistent. */
3681                                         rc = lfsck_namespace_shrink_linkea(env,
3682                                                         com, child, &ldata,
3683                                                         cname, pfid, true);
3684                                 else
3685                                         linkea_next_entry(&ldata);
3686                         }
3687
3688                         lfsck_object_put(env, parent);
3689                         if (rc < 0)
3690                                 GOTO(out, rc);
3691
3692                         if (rc > 0)
3693                                 repaired = true;
3694
3695                         continue;
3696                 } /* !dt_object_exists(parent) */
3697
3698                 /* The linkEA entry with bad parent will be removed. */
3699                 if (unlikely(!dt_try_as_dir(env, parent))) {
3700                         lfsck_object_put(env, parent);
3701                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3702                                                 &ldata, cname, pfid, true);
3703                         if (rc < 0)
3704                                 GOTO(out, rc);
3705
3706                         if (rc > 0)
3707                                 repaired = true;
3708
3709                         continue;
3710                 }
3711
3712                 rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
3713                                (const struct dt_key *)cname->ln_name);
3714                 if (rc != 0 && rc != -ENOENT) {
3715                         lfsck_object_put(env, parent);
3716
3717                         GOTO(out, rc);
3718                 }
3719
3720                 if (rc == 0) {
3721                         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
3722                                 /* It is the most common case that we
3723                                  * find the name entry corresponding
3724                                  * to the linkEA entry. */
3725                                 lfsck_object_put(env, parent);
3726                                 linkea_next_entry(&ldata);
3727                         } else {
3728                                 /* The name entry references another
3729                                  * MDT-object that may be created by
3730                                  * the LFSCK for repairing dangling
3731                                  * name entry. Try to replace it. */
3732                                 rc = lfsck_namespace_replace_cond(env, com,
3733                                                 parent, child, cfid, cname);
3734                                 lfsck_object_put(env, parent);
3735                                 if (rc < 0)
3736                                         GOTO(out, rc);
3737
3738                                 if (rc > 0) {
3739                                         repaired = true;
3740                                         linkea_next_entry(&ldata);
3741                                 } else {
3742                                         rc = lfsck_namespace_shrink_linkea(env,
3743                                                         com, child, &ldata,
3744                                                         cname, pfid, true);
3745                                         if (rc < 0)
3746                                                 GOTO(out, rc);
3747
3748                                         if (rc > 0)
3749                                                 repaired = true;
3750                                 }
3751                         }
3752
3753                         continue;
3754                 }
3755
3756                 /* The following handles -ENOENT case */
3757
3758                 rc = dt_attr_get(env, child, la);
3759                 if (rc != 0)
3760                         GOTO(out, rc);
3761
3762                 /* If there is no name entry in the parent dir and the object
3763                  * link count is fewer than the linkea entries count, then the
3764                  * linkea entry should be removed. */
3765                 if (ldata.ld_leh->leh_reccount > la->la_nlink) {
3766                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
3767                                         parent, child, &ldata, cname, pfid);
3768                         lfsck_object_put(env, parent);
3769                         if (rc < 0)
3770                                 GOTO(out, rc);
3771
3772                         if (rc > 0)
3773                                 repaired = true;
3774
3775                         continue;
3776                 }
3777
3778                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some
3779                  * MDT has ever tried to verify some remote MDT-object that
3780                  * resides on this MDT, but this MDT failed to respond such
3781                  * request. So means there may be some remote name entry on
3782                  * other MDT that references this object with another name,
3783                  * so we cannot know whether this linkEA is valid or not.
3784                  * So keep it there and maybe resolved when next LFSCK run. */
3785                 if (ns->ln_flags & LF_INCOMPLETE) {
3786                         lfsck_object_put(env, parent);
3787
3788                         GOTO(out, rc = 0);
3789                 }
3790
3791                 rc = lfsck_namespace_check_name(env, lfsck, parent, child,
3792                                                 cname);
3793                 if (rc == -ENOENT)
3794                         goto lost_parent;
3795
3796                 if (rc < 0) {
3797                         lfsck_object_put(env, parent);
3798
3799                         GOTO(out, rc);
3800                 }
3801
3802                 /* It is an invalid name entry, drop it. */
3803                 if (unlikely(rc > 0)) {
3804                         lfsck_object_put(env, parent);
3805                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3806                                                 &ldata, cname, pfid, true);
3807                         if (rc < 0)
3808                                 GOTO(out, rc);
3809
3810                         if (rc > 0)
3811                                 repaired = true;
3812
3813                         continue;
3814                 }
3815
3816                 /* Add the missing name entry back to the namespace. */
3817                 rc = lfsck_namespace_insert_normal(env, com, parent, child,
3818                                                    cname->ln_name);
3819                 if (unlikely(rc == -ESTALE))
3820                         /* It may happen when the remote object has been
3821                          * removed, but the local MDT is not aware of that. */
3822                         goto lost_parent;
3823
3824                 if (unlikely(rc == -EEXIST))
3825                         /* Unfortunately, someone reused the name under the
3826                          * parent by race. So we have to remove the linkEA
3827                          * entry from current child object. It means that the
3828                          * LFSCK cannot recover the system totally back to
3829                          * its original status, but it is necessary to make
3830                          * the current system to be consistent.
3831                          *
3832                          * It also may be because of the LFSCK found some
3833                          * internal status of create operation. Under such
3834                          * case, nothing to be done. */
3835                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
3836                                         parent, child, &ldata, cname, pfid);
3837                 else
3838                         linkea_next_entry(&ldata);
3839
3840                 lfsck_object_put(env, parent);
3841                 if (rc < 0)
3842                         GOTO(out, rc);
3843
3844                 if (rc > 0)
3845                         repaired = true;
3846         }
3847
3848         GOTO(out, rc = 0);
3849
3850 out:
3851         if (rc < 0 && rc != -ENODATA)
3852                 return rc;
3853
3854         if (rc == 0 && ldata.ld_leh != NULL)
3855                 count = ldata.ld_leh->leh_reccount;
3856
3857         if (count == 0) {
3858                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some
3859                  * MDT has ever tried to verify some remote MDT-object that
3860                  * resides on this MDT, but this MDT failed to respond such
3861                  * request. So means there may be some remote name entry on
3862                  * other MDT that references this object with another name,
3863                  * so we cannot know whether this linkEA is valid or not.
3864                  * So keep it there and maybe resolved when next LFSCK run. */
3865                 if (!(ns->ln_flags & LF_INCOMPLETE) &&
3866                     (ldata.ld_leh == NULL ||
3867                      !ldata.ld_leh->leh_overflow_time)) {
3868                         /* If the child becomes orphan, then insert it into
3869                          * the global .lustre/lost+found/MDTxxxx directory. */
3870                         rc = lfsck_namespace_insert_orphan(env, com, child,
3871                                                            "", "O", &count);
3872                         if (rc < 0)
3873                                 return rc;
3874
3875                         if (rc > 0) {
3876                                 ns->ln_mul_ref_repaired++;
3877                                 repaired = true;
3878                         }
3879                 }
3880         } else {
3881                 rc = dt_attr_get(env, child, la);
3882                 if (rc != 0)
3883                         return rc;
3884
3885                 if (la->la_nlink != 0 && la->la_nlink != count) {
3886                         if (unlikely(!S_ISREG(lfsck_object_type(child)) &&
3887                                      !S_ISLNK(lfsck_object_type(child)))) {
3888                                 CDEBUG(D_LFSCK, "%s: namespace LFSCK finds "
3889                                        "the object "DFID"'s nlink count %d "
3890                                        "does not match linkEA count %d, "
3891                                        "type %o, skip it.\n",
3892                                        lfsck_lfsck2name(lfsck),
3893                                        PFID(lfsck_dto2fid(child)),
3894                                        la->la_nlink, count,
3895                                        lfsck_object_type(child));
3896                         } else if (la->la_nlink < count &&
3897                                    likely(!ldata.ld_leh->leh_overflow_time)) {
3898                                 rc = lfsck_namespace_repair_nlink(env, com,
3899                                                                   child, la);
3900                                 if (rc > 0) {
3901                                         ns->ln_objs_nlink_repaired++;
3902                                         rc = 0;
3903                                 }
3904                         }
3905                 }
3906         }
3907
3908         if (repaired) {
3909                 if (la->la_nlink > 1)
3910                         ns->ln_mul_linked_repaired++;
3911
3912                 if (rc == 0)
3913                         rc = 1;
3914         }
3915
3916         if (!rc && flags & LNTF_CHECK_AGENT_ENTRY)
3917                 rc = lfsck_namespace_check_agent_entry(env, com, child);
3918
3919         return rc;
3920 }
3921
3922 static void lfsck_namespace_dump_statistics(struct seq_file *m,
3923                                             struct lfsck_namespace *ns,
3924                                             __u64 checked_phase1,
3925                                             __u64 checked_phase2,
3926                                             time64_t time_phase1,
3927                                             time64_t time_phase2, bool dryrun)
3928 {
3929         const char *postfix = dryrun ? "inconsistent" : "repaired";
3930
3931         seq_printf(m, "checked_phase1: %llu\n"
3932                    "checked_phase2: %llu\n"
3933                    "%s_phase1: %llu\n"
3934                    "%s_phase2: %llu\n"
3935                    "failed_phase1: %llu\n"
3936                    "failed_phase2: %llu\n"
3937                    "directories: %llu\n"
3938                    "dirent_%s: %llu\n"
3939                    "linkea_%s: %llu\n"
3940                    "nlinks_%s: %llu\n"
3941                    "multiple_linked_checked: %llu\n"
3942                    "multiple_linked_%s: %llu\n"
3943                    "unknown_inconsistency: %llu\n"
3944                    "unmatched_pairs_%s: %llu\n"
3945                    "dangling_%s: %llu\n"
3946                    "multiple_referenced_%s: %llu\n"
3947                    "bad_file_type_%s: %llu\n"
3948                    "lost_dirent_%s: %llu\n"
3949                    "local_lost_found_scanned: %llu\n"
3950                    "local_lost_found_moved: %llu\n"
3951                    "local_lost_found_skipped: %llu\n"
3952                    "local_lost_found_failed: %llu\n"
3953                    "striped_dirs_scanned: %llu\n"
3954                    "striped_dirs_%s: %llu\n"
3955                    "striped_dirs_failed: %llu\n"
3956                    "striped_dirs_disabled: %llu\n"
3957                    "striped_dirs_skipped: %llu\n"
3958                    "striped_shards_scanned: %llu\n"
3959                    "striped_shards_%s: %llu\n"
3960                    "striped_shards_failed: %llu\n"
3961                    "striped_shards_skipped: %llu\n"
3962                    "name_hash_%s: %llu\n"
3963                    "linkea_overflow_%s: %llu\n"
3964                    "agent_entries_%s: %llu\n"
3965                    "success_count: %u\n"
3966                    "run_time_phase1: %lld seconds\n"
3967                    "run_time_phase2: %lld seconds\n",
3968                    checked_phase1,
3969                    checked_phase2,
3970                    dryrun ? "inconsistent" : "updated",
3971                    ns->ln_items_repaired,
3972                    dryrun ? "inconsistent" : "updated",
3973                    ns->ln_objs_repaired_phase2,
3974                    ns->ln_items_failed,
3975                    ns->ln_objs_failed_phase2,
3976                    ns->ln_dirs_checked,
3977                    postfix, ns->ln_dirent_repaired,
3978                    postfix, ns->ln_linkea_repaired,
3979                    postfix, ns->ln_objs_nlink_repaired,
3980                    ns->ln_mul_linked_checked,
3981                    postfix, ns->ln_mul_linked_repaired,
3982                    ns->ln_unknown_inconsistency,
3983                    postfix, ns->ln_unmatched_pairs_repaired,
3984                    postfix, ns->ln_dangling_repaired,
3985                    postfix, ns->ln_mul_ref_repaired,
3986                    postfix, ns->ln_bad_type_repaired,
3987                    postfix, ns->ln_lost_dirent_repaired,
3988                    ns->ln_local_lpf_scanned,
3989                    ns->ln_local_lpf_moved,
3990                    ns->ln_local_lpf_skipped,
3991                    ns->ln_local_lpf_failed,
3992                    ns->ln_striped_dirs_scanned,
3993                    postfix, ns->ln_striped_dirs_repaired,
3994                    ns->ln_striped_dirs_failed,
3995                    ns->ln_striped_dirs_disabled,
3996                    ns->ln_striped_dirs_skipped,
3997                    ns->ln_striped_shards_scanned,
3998                    postfix, ns->ln_striped_shards_repaired,
3999                    ns->ln_striped_shards_failed,
4000                    ns->ln_striped_shards_skipped,
4001                    postfix, ns->ln_name_hash_repaired,
4002                    dryrun ? "inconsistent" : "cleared",
4003                    ns->ln_linkea_overflow_cleared,
4004                    postfix, ns->ln_agent_entries_repaired,
4005                    ns->ln_success_count,
4006                    time_phase1,
4007                    time_phase2);
4008 }
4009
4010 static void lfsck_namespace_release_lmv(const struct lu_env *env,
4011                                         struct lfsck_component *com)
4012 {
4013         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4014         struct lfsck_namespace          *ns     = com->lc_file_ram;
4015
4016         while (!list_empty(&lfsck->li_list_lmv)) {
4017                 struct lfsck_lmv_unit   *llu;
4018                 struct lfsck_lmv        *llmv;
4019
4020                 llu = list_entry(lfsck->li_list_lmv.next,
4021                                  struct lfsck_lmv_unit, llu_link);
4022                 llmv = &llu->llu_lmv;
4023
4024                 LASSERTF(atomic_read(&llmv->ll_ref) == 1,
4025                          "still in using: %u\n",
4026                          atomic_read(&llmv->ll_ref));
4027
4028                 ns->ln_striped_dirs_skipped++;
4029                 lfsck_lmv_put(env, llmv);
4030         }
4031 }
4032
4033 static int lfsck_namespace_check_for_double_scan(const struct lu_env *env,
4034                                                  struct lfsck_component *com,
4035                                                  struct dt_object *obj)
4036 {
4037         struct lu_attr *la = &lfsck_env_info(env)->lti_la;
4038         int             rc;
4039
4040         rc = dt_attr_get(env, obj, la);
4041         if (rc != 0)
4042                 return rc;
4043
4044         /* zero-linkEA object may be orphan, but it also maybe because
4045          * of upgrading. Currently, we cannot record it for double scan.
4046          * Because it may cause the LFSCK trace file to be too large. */
4047
4048         /* "la_ctime" == 1 means that it has ever been removed from
4049          * backend /lost+found directory but not been added back to
4050          * the normal namespace yet. */
4051
4052         if ((S_ISREG(lfsck_object_type(obj)) && la->la_nlink > 1) ||
4053             unlikely(la->la_ctime == 1))
4054                 rc = lfsck_namespace_trace_update(env, com, lfsck_dto2fid(obj),
4055                                                   LNTF_CHECK_LINKEA, true);
4056
4057         return rc;
4058 }
4059
4060 /* namespace APIs */
4061
4062 static int lfsck_namespace_reset(const struct lu_env *env,
4063                                  struct lfsck_component *com, bool init)
4064 {
4065         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4066         struct lfsck_namespace          *ns     = com->lc_file_ram;
4067         struct lfsck_assistant_data     *lad    = com->lc_data;
4068         struct dt_object                *root;
4069         int                              rc;
4070         ENTRY;
4071
4072         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
4073         if (IS_ERR(root))
4074                 GOTO(log, rc = PTR_ERR(root));
4075
4076         if (unlikely(!dt_try_as_dir(env, root)))
4077                 GOTO(put, rc = -ENOTDIR);
4078
4079         down_write(&com->lc_sem);
4080         if (init) {
4081                 memset(ns, 0, sizeof(*ns));
4082         } else {
4083                 __u32 count = ns->ln_success_count;
4084                 time64_t last_time = ns->ln_time_last_complete;
4085
4086                 memset(ns, 0, sizeof(*ns));
4087                 ns->ln_success_count = count;
4088                 ns->ln_time_last_complete = last_time;
4089         }
4090         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
4091         ns->ln_status = LS_INIT;
4092         ns->ln_time_latest_reset = ktime_get_real_seconds();
4093
4094         rc = lfsck_load_one_trace_file(env, com, root, &com->lc_obj,
4095                                        &dt_lfsck_namespace_features,
4096                                        LFSCK_NAMESPACE, true);
4097         if (rc)
4098                 GOTO(out, rc);
4099
4100         rc = lfsck_load_sub_trace_files(env, com, &dt_lfsck_namespace_features,
4101                                         LFSCK_NAMESPACE, true);
4102         if (rc != 0)
4103                 GOTO(out, rc);
4104
4105         clear_bit(LAD_INCOMPLETE, &lad->lad_flags);
4106         CFS_RESET_BITMAP(lad->lad_bitmap);
4107
4108         rc = lfsck_namespace_store(env, com);
4109
4110         GOTO(out, rc);
4111
4112 out:
4113         up_write(&com->lc_sem);
4114
4115 put:
4116         lfsck_object_put(env, root);
4117 log:
4118         CDEBUG(D_LFSCK, "%s: namespace LFSCK reset: rc = %d\n",
4119                lfsck_lfsck2name(lfsck), rc);
4120         return rc;
4121 }
4122
4123 static void
4124 lfsck_namespace_fail(const struct lu_env *env, struct lfsck_component *com,
4125                      bool new_checked)
4126 {
4127         struct lfsck_namespace *ns = com->lc_file_ram;
4128
4129         down_write(&com->lc_sem);
4130         if (new_checked)
4131                 com->lc_new_checked++;
4132         lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
4133         up_write(&com->lc_sem);
4134 }
4135
4136 static void lfsck_namespace_close_dir(const struct lu_env *env,
4137                                       struct lfsck_component *com)
4138 {
4139         struct lfsck_namespace          *ns     = com->lc_file_ram;
4140         struct lfsck_assistant_data     *lad    = com->lc_data;
4141         struct lfsck_assistant_object   *lso    = NULL;
4142         struct lfsck_instance           *lfsck  = com->lc_lfsck;
4143         struct lfsck_lmv                *llmv   = lfsck->li_lmv;
4144         struct lfsck_namespace_req      *lnr;
4145         struct lu_attr *la = &lfsck_env_info(env)->lti_la2;
4146         __u32 size = sizeof(*lnr) + LFSCK_TMPBUF_LEN;
4147         int rc;
4148         bool wakeup = false;
4149         ENTRY;
4150
4151         if (llmv == NULL)
4152                 RETURN_EXIT;
4153
4154         rc = dt_attr_get(env, lfsck->li_obj_dir, la);
4155         if (rc)
4156                 RETURN_EXIT;
4157
4158         OBD_ALLOC(lnr, size);
4159         if (lnr == NULL) {
4160                 ns->ln_striped_dirs_skipped++;
4161
4162                 RETURN_EXIT;
4163         }
4164
4165         lso = lfsck_assistant_object_init(env, lfsck_dto2fid(lfsck->li_obj_dir),
4166                         la, lfsck->li_pos_current.lp_oit_cookie, true);
4167         if (IS_ERR(lso)) {
4168                 OBD_FREE(lnr, size);
4169                 ns->ln_striped_dirs_skipped++;
4170
4171                 RETURN_EXIT;
4172         }
4173
4174         /* Generate a dummy request to indicate that all shards' name entry
4175          * in this striped directory has been scanned for the first time. */
4176         INIT_LIST_HEAD(&lnr->lnr_lar.lar_list);
4177         lnr->lnr_lar.lar_parent = lso;
4178         lnr->lnr_lmv = lfsck_lmv_get(llmv);
4179         lnr->lnr_fid = *lfsck_dto2fid(lfsck->li_obj_dir);
4180         lnr->lnr_dir_cookie = MDS_DIR_END_OFF;
4181         lnr->lnr_size = size;
4182         lnr->lnr_type = lso->lso_attr.la_mode;
4183
4184         spin_lock(&lad->lad_lock);
4185         if (lad->lad_assistant_status < 0 ||
4186             unlikely(!thread_is_running(&lfsck->li_thread) ||
4187                      !thread_is_running(&lad->lad_thread))) {
4188                 spin_unlock(&lad->lad_lock);
4189                 lfsck_namespace_assistant_req_fini(env, &lnr->lnr_lar);
4190                 ns->ln_striped_dirs_skipped++;
4191
4192                 RETURN_EXIT;
4193         }
4194
4195         list_add_tail(&lnr->lnr_lar.lar_list, &lad->lad_req_list);
4196         if (lad->lad_prefetched == 0)
4197                 wakeup = true;
4198
4199         lad->lad_prefetched++;
4200         spin_unlock(&lad->lad_lock);
4201         if (wakeup)
4202                 wake_up_all(&lad->lad_thread.t_ctl_waitq);
4203
4204         EXIT;
4205 }
4206
4207 static int lfsck_namespace_open_dir(const struct lu_env *env,
4208                                     struct lfsck_component *com)
4209 {
4210         struct lfsck_instance   *lfsck  = com->lc_lfsck;
4211         struct lfsck_namespace  *ns     = com->lc_file_ram;
4212         struct lfsck_lmv        *llmv   = lfsck->li_lmv;
4213         int                      rc     = 0;
4214         ENTRY;
4215
4216         if (llmv == NULL)
4217                 RETURN(0);
4218
4219         if (llmv->ll_lmv_master) {
4220                 struct lmv_mds_md_v1 *lmv = &llmv->ll_lmv;
4221
4222                 if (lmv->lmv_master_mdt_index != lfsck_dev_idx(lfsck)) {
4223                         lmv->lmv_master_mdt_index =
4224                                 lfsck_dev_idx(lfsck);
4225                         ns->ln_flags |= LF_INCONSISTENT;
4226                         llmv->ll_lmv_updated = 1;
4227                 }
4228         } else {
4229                 rc = lfsck_namespace_verify_stripe_slave(env, com,
4230                                         lfsck->li_obj_dir, llmv);
4231         }
4232
4233         RETURN(rc > 0 ? 0 : rc);
4234 }
4235
4236 static int lfsck_namespace_checkpoint(const struct lu_env *env,
4237                                       struct lfsck_component *com, bool init)
4238 {
4239         struct lfsck_instance   *lfsck = com->lc_lfsck;
4240         struct lfsck_namespace  *ns    = com->lc_file_ram;
4241         int                      rc;
4242
4243         if (!init) {
4244                 rc = lfsck_checkpoint_generic(env, com);
4245                 if (rc != 0)
4246                         goto log;
4247         }
4248
4249         down_write(&com->lc_sem);
4250         if (init) {
4251                 ns->ln_pos_latest_start = lfsck->li_pos_checkpoint;
4252         } else {
4253                 ns->ln_pos_last_checkpoint = lfsck->li_pos_checkpoint;
4254                 ns->ln_run_time_phase1 += ktime_get_seconds() -
4255                                           lfsck->li_time_last_checkpoint;
4256                 ns->ln_time_last_checkpoint = ktime_get_real_seconds();
4257                 ns->ln_items_checked += com->lc_new_checked;
4258                 com->lc_new_checked = 0;
4259         }
4260
4261         rc = lfsck_namespace_store(env, com);
4262         up_write(&com->lc_sem);
4263
4264 log:
4265         CDEBUG(D_LFSCK, "%s: namespace LFSCK checkpoint at the pos [%llu"
4266                ", "DFID", %#llx], status = %d: rc = %d\n",
4267                lfsck_lfsck2name(lfsck), lfsck->li_pos_current.lp_oit_cookie,
4268                PFID(&lfsck->li_pos_current.lp_dir_parent),
4269                lfsck->li_pos_current.lp_dir_cookie, ns->ln_status, rc);
4270
4271         return rc > 0 ? 0 : rc;
4272 }
4273
4274 static int lfsck_namespace_prep(const struct lu_env *env,
4275                                 struct lfsck_component *com,
4276                                 struct lfsck_start_param *lsp)
4277 {
4278         struct lfsck_instance   *lfsck  = com->lc_lfsck;
4279         struct lfsck_namespace  *ns     = com->lc_file_ram;
4280         struct lfsck_position   *pos    = &com->lc_pos_start;
4281         int                      rc;
4282
4283         rc = lfsck_namespace_load_bitmap(env, com);
4284         if (rc != 0 || ns->ln_status == LS_COMPLETED) {
4285                 rc = lfsck_namespace_reset(env, com, false);
4286                 if (rc == 0)
4287                         rc = lfsck_set_param(env, lfsck, lsp->lsp_start, true);
4288
4289                 if (rc != 0) {
4290                         CDEBUG(D_LFSCK, "%s: namespace LFSCK prep failed: "
4291                                "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
4292
4293                         return rc;
4294                 }
4295         }
4296
4297         down_write(&com->lc_sem);
4298         ns->ln_time_latest_start = ktime_get_real_seconds();
4299         spin_lock(&lfsck->li_lock);
4300
4301         if (ns->ln_flags & LF_SCANNED_ONCE) {
4302                 if (!lfsck->li_drop_dryrun ||
4303                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
4304                         ns->ln_status = LS_SCANNING_PHASE2;
4305                         list_move_tail(&com->lc_link,
4306                                        &lfsck->li_list_double_scan);
4307                         if (!list_empty(&com->lc_link_dir))
4308                                 list_del_init(&com->lc_link_dir);
4309                         lfsck_pos_set_zero(pos);
4310                 } else {
4311                         ns->ln_status = LS_SCANNING_PHASE1;
4312                         ns->ln_run_time_phase1 = 0;
4313                         ns->ln_run_time_phase2 = 0;
4314                         ns->ln_items_checked = 0;
4315                         ns->ln_items_repaired = 0;
4316                         ns->ln_items_failed = 0;
4317                         ns->ln_dirs_checked = 0;
4318                         ns->ln_objs_checked_phase2 = 0;
4319                         ns->ln_objs_repaired_phase2 = 0;
4320                         ns->ln_objs_failed_phase2 = 0;
4321                         ns->ln_objs_nlink_repaired = 0;
4322                         ns->ln_dirent_repaired = 0;
4323                         ns->ln_linkea_repaired = 0;
4324                         ns->ln_mul_linked_checked = 0;
4325                         ns->ln_mul_linked_repaired = 0;
4326                         ns->ln_unknown_inconsistency = 0;
4327                         ns->ln_unmatched_pairs_repaired = 0;
4328                         ns->ln_dangling_repaired = 0;
4329                         ns->ln_mul_ref_repaired = 0;
4330                         ns->ln_bad_type_repaired = 0;
4331                         ns->ln_lost_dirent_repaired = 0;
4332                         ns->ln_striped_dirs_scanned = 0;
4333                         ns->ln_striped_dirs_repaired = 0;
4334                         ns->ln_striped_dirs_failed = 0;
4335                         ns->ln_striped_dirs_disabled = 0;
4336                         ns->ln_striped_dirs_skipped = 0;
4337                         ns->ln_striped_shards_scanned = 0;
4338                         ns->ln_striped_shards_repaired = 0;
4339                         ns->ln_striped_shards_failed = 0;
4340                         ns->ln_striped_shards_skipped = 0;
4341                         ns->ln_name_hash_repaired = 0;
4342                         fid_zero(&ns->ln_fid_latest_scanned_phase2);
4343                         if (list_empty(&com->lc_link_dir))
4344                                 list_add_tail(&com->lc_link_dir,
4345                                               &lfsck->li_list_dir);
4346                         *pos = ns->ln_pos_first_inconsistent;
4347                 }
4348         } else {
4349                 ns->ln_status = LS_SCANNING_PHASE1;
4350                 if (list_empty(&com->lc_link_dir))
4351                         list_add_tail(&com->lc_link_dir,
4352                                       &lfsck->li_list_dir);
4353                 if (!lfsck->li_drop_dryrun ||
4354                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
4355                         *pos = ns->ln_pos_last_checkpoint;
4356                         pos->lp_oit_cookie++;
4357                 } else {
4358                         *pos = ns->ln_pos_first_inconsistent;
4359                 }
4360         }
4361
4362         spin_unlock(&lfsck->li_lock);
4363         up_write(&com->lc_sem);
4364
4365         rc = lfsck_start_assistant(env, com, lsp);
4366
4367         CDEBUG(D_LFSCK, "%s: namespace LFSCK prep done, start pos [%llu, "
4368                DFID", %#llx]: rc = %d\n",
4369                lfsck_lfsck2name(lfsck), pos->lp_oit_cookie,
4370                PFID(&pos->lp_dir_parent), pos->lp_dir_cookie, rc);
4371
4372         return rc;
4373 }
4374
4375 static int lfsck_namespace_exec_oit(const struct lu_env *env,
4376                                     struct lfsck_component *com,
4377                                     struct dt_object *obj)
4378 {
4379         struct lfsck_thread_info *info  = lfsck_env_info(env);
4380         struct lfsck_namespace   *ns    = com->lc_file_ram;
4381         struct lfsck_instance    *lfsck = com->lc_lfsck;
4382         const struct lu_fid      *fid   = lfsck_dto2fid(obj);
4383         struct lu_fid            *pfid  = &info->lti_fid2;
4384         struct lu_name           *cname = &info->lti_name;
4385         struct lu_seq_range      *range = &info->lti_range;
4386         struct seq_server_site   *ss    = lfsck_dev_site(lfsck);
4387         struct linkea_data        ldata = { NULL };
4388         __u32                     idx   = lfsck_dev_idx(lfsck);
4389         int                       rc;
4390         bool remote = false;
4391         ENTRY;
4392
4393         rc = lfsck_links_read(env, obj, &ldata);
4394         if (rc == -ENOENT)
4395                 GOTO(out, rc = 0);
4396
4397         /* -EINVAL means crashed linkEA, should be verified. */
4398         if (rc == -EINVAL) {
4399                 rc = lfsck_namespace_trace_update(env, com, fid,
4400                                                   LNTF_CHECK_LINKEA, true);
4401                 if (rc == 0) {
4402                         struct lustre_handle lh = { 0 };
4403
4404                         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
4405                                               MDS_INODELOCK_UPDATE |
4406                                               MDS_INODELOCK_XATTR, LCK_EX);
4407                         if (rc == 0) {
4408                                 rc = lfsck_namespace_links_remove(env, com,
4409                                                                   obj);
4410                                 lfsck_ibits_unlock(&lh, LCK_EX);
4411                         }
4412                 }
4413
4414                 GOTO(out, rc = (rc == -ENOENT ? 0 : rc));
4415         }
4416
4417         if (rc && rc != -ENODATA)
4418                 GOTO(out, rc);
4419
4420         if (rc == -ENODATA || unlikely(!ldata.ld_leh->leh_reccount)) {
4421                 rc = lfsck_namespace_check_for_double_scan(env, com, obj);
4422
4423                 GOTO(out, rc);
4424         }
4425
4426         linkea_first_entry(&ldata);
4427         while (ldata.ld_lee != NULL) {
4428                 linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen,
4429                                     cname, pfid);
4430                 if (!fid_is_sane(pfid)) {
4431                         rc = lfsck_namespace_trace_update(env, com, fid,
4432                                                   LNTF_CHECK_PARENT, true);
4433                 } else if (!linkea_entry_is_valid(&ldata, cname, pfid)) {
4434                         GOTO(out, rc);
4435                 } else {
4436                         fld_range_set_mdt(range);
4437                         rc = fld_server_lookup(env, ss->ss_server_fld,
4438                                                fid_seq(pfid), range);
4439                         if ((rc == -ENOENT) ||
4440                             (!rc && range->lsr_index != idx)) {
4441                                 remote = true;
4442                                 break;
4443                         }
4444                 }
4445                 if (rc)
4446                         GOTO(out, rc);
4447
4448                 linkea_next_entry(&ldata);
4449         }
4450
4451         if ((lu_object_has_agent_entry(&obj->do_lu) && !remote) ||
4452             (!lu_object_has_agent_entry(&obj->do_lu) && remote)) {
4453                 rc = lfsck_namespace_trace_update(env, com, fid,
4454                                                   LNTF_CHECK_AGENT_ENTRY, true);
4455                 if (rc)
4456                         GOTO(out, rc);
4457         }
4458
4459         /* Record multiple-linked object. */
4460         if (ldata.ld_leh->leh_reccount > 1) {
4461                 rc = lfsck_namespace_trace_update(env, com, fid,
4462                                                   LNTF_CHECK_LINKEA, true);
4463
4464                 GOTO(out, rc);
4465         }
4466
4467         if (remote)
4468                 rc = lfsck_namespace_trace_update(env, com, fid,
4469                                                   LNTF_CHECK_LINKEA, true);
4470         else
4471                 rc = lfsck_namespace_check_for_double_scan(env, com, obj);
4472
4473         GOTO(out, rc);
4474
4475 out:
4476         down_write(&com->lc_sem);
4477         if (S_ISDIR(lfsck_object_type(obj)))
4478                 ns->ln_dirs_checked++;
4479         if (rc != 0)
4480                 lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
4481         up_write(&com->lc_sem);
4482
4483         return rc;
4484 }
4485
4486 static int lfsck_namespace_exec_dir(const struct lu_env *env,
4487                                     struct lfsck_component *com,
4488                                     struct lfsck_assistant_object *lso,
4489                                     struct lu_dirent *ent, __u16 type)
4490 {
4491         struct lfsck_assistant_data     *lad     = com->lc_data;
4492         struct lfsck_instance           *lfsck   = com->lc_lfsck;
4493         struct lfsck_namespace_req      *lnr;
4494         struct lfsck_bookmark           *bk      = &lfsck->li_bookmark_ram;
4495         struct ptlrpc_thread            *mthread = &lfsck->li_thread;
4496         struct ptlrpc_thread            *athread = &lad->lad_thread;
4497         struct l_wait_info               lwi     = { 0 };
4498         bool                             wakeup  = false;
4499
4500         l_wait_event(mthread->t_ctl_waitq,
4501                      lad->lad_prefetched < bk->lb_async_windows ||
4502                      !thread_is_running(mthread) ||
4503                      !thread_is_running(athread),
4504                      &lwi);
4505
4506         if (unlikely(!thread_is_running(mthread) ||
4507                      !thread_is_running(athread)))
4508                 return 0;
4509
4510         if (unlikely(lfsck_is_dead_obj(lfsck->li_obj_dir)))
4511                 return 0;
4512
4513         lnr = lfsck_namespace_assistant_req_init(com->lc_lfsck, lso, ent, type);
4514         if (IS_ERR(lnr)) {
4515                 struct lfsck_namespace *ns = com->lc_file_ram;
4516
4517                 lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
4518                 return PTR_ERR(lnr);
4519         }
4520
4521         spin_lock(&lad->lad_lock);
4522         if (lad->lad_assistant_status < 0 ||
4523             unlikely(!thread_is_running(mthread) ||
4524                      !thread_is_running(athread))) {
4525                 spin_unlock(&lad->lad_lock);
4526                 lfsck_namespace_assistant_req_fini(env, &lnr->lnr_lar);
4527                 return lad->lad_assistant_status;
4528         }
4529
4530         list_add_tail(&lnr->lnr_lar.lar_list, &lad->lad_req_list);
4531         if (lad->lad_prefetched == 0)
4532                 wakeup = true;
4533
4534         lad->lad_prefetched++;
4535         spin_unlock(&lad->lad_lock);
4536         if (wakeup)
4537                 wake_up_all(&lad->lad_thread.t_ctl_waitq);
4538
4539         down_write(&com->lc_sem);
4540         com->lc_new_checked++;
4541         up_write(&com->lc_sem);
4542
4543         return 0;
4544 }
4545
4546 static int lfsck_namespace_post(const struct lu_env *env,
4547                                 struct lfsck_component *com,
4548                                 int result, bool init)
4549 {
4550         struct lfsck_instance   *lfsck = com->lc_lfsck;
4551         struct lfsck_namespace  *ns    = com->lc_file_ram;
4552         int                      rc;
4553         ENTRY;
4554
4555         lfsck_post_generic(env, com, &result);
4556
4557         down_write(&com->lc_sem);
4558         lfsck_namespace_release_lmv(env, com);
4559
4560         spin_lock(&lfsck->li_lock);
4561         if (!init)
4562                 ns->ln_pos_last_checkpoint = lfsck->li_pos_checkpoint;
4563         if (result > 0) {
4564                 ns->ln_status = LS_SCANNING_PHASE2;
4565                 ns->ln_flags |= LF_SCANNED_ONCE;
4566                 ns->ln_flags &= ~LF_UPGRADE;
4567                 list_del_init(&com->lc_link_dir);
4568                 list_move_tail(&com->lc_link, &lfsck->li_list_double_scan);
4569         } else if (result == 0) {
4570                 if (lfsck->li_status != 0)
4571                         ns->ln_status = lfsck->li_status;
4572                 else
4573                         ns->ln_status = LS_STOPPED;
4574                 if (ns->ln_status != LS_PAUSED) {
4575                         list_del_init(&com->lc_link_dir);
4576                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4577                 }
4578         } else {
4579                 ns->ln_status = LS_FAILED;
4580                 list_del_init(&com->lc_link_dir);
4581                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
4582         }
4583         spin_unlock(&lfsck->li_lock);
4584
4585         if (!init) {
4586                 ns->ln_run_time_phase1 += ktime_get_seconds() -
4587                                           lfsck->li_time_last_checkpoint;
4588                 ns->ln_time_last_checkpoint = ktime_get_real_seconds();
4589                 ns->ln_items_checked += com->lc_new_checked;
4590                 com->lc_new_checked = 0;
4591         }
4592
4593         rc = lfsck_namespace_store(env, com);
4594         up_write(&com->lc_sem);
4595
4596         CDEBUG(D_LFSCK, "%s: namespace LFSCK post done: rc = %d\n",
4597                lfsck_lfsck2name(lfsck), rc);
4598
4599         RETURN(rc);
4600 }
4601
4602 static void
4603 lfsck_namespace_dump(const struct lu_env *env, struct lfsck_component *com,
4604                      struct seq_file *m)
4605 {
4606         struct lfsck_instance   *lfsck = com->lc_lfsck;
4607         struct lfsck_bookmark   *bk    = &lfsck->li_bookmark_ram;
4608         struct lfsck_namespace  *ns    = com->lc_file_ram;
4609
4610         down_read(&com->lc_sem);
4611         seq_printf(m, "name: lfsck_namespace\n"
4612                    "magic: %#x\n"
4613                    "version: %d\n"
4614                    "status: %s\n",
4615                    ns->ln_magic,
4616                    bk->lb_version,
4617                    lfsck_status2name(ns->ln_status));
4618
4619         lfsck_bits_dump(m, ns->ln_flags, lfsck_flags_names, "flags");
4620
4621         lfsck_bits_dump(m, bk->lb_param, lfsck_param_names, "param");
4622
4623         lfsck_time_dump(m, ns->ln_time_last_complete, "last_completed");
4624
4625         lfsck_time_dump(m, ns->ln_time_latest_start, "latest_start");
4626
4627         lfsck_time_dump(m, ns->ln_time_last_checkpoint, "last_checkpoint");
4628
4629         lfsck_pos_dump(m, &ns->ln_pos_latest_start, "latest_start_position");
4630
4631         lfsck_pos_dump(m, &ns->ln_pos_last_checkpoint,
4632                        "last_checkpoint_position");
4633
4634         lfsck_pos_dump(m, &ns->ln_pos_first_inconsistent,
4635                        "first_failure_position");
4636
4637         if (ns->ln_status == LS_SCANNING_PHASE1) {
4638                 struct lfsck_position pos;
4639                 time64_t duration = ktime_get_seconds() -
4640                                     lfsck->li_time_last_checkpoint;
4641                 u64 checked = ns->ln_items_checked + com->lc_new_checked;
4642                 u64 speed = checked;
4643                 u64 new_checked = com->lc_new_checked;
4644                 time64_t rtime = ns->ln_run_time_phase1 + duration;
4645
4646                 if (duration != 0)
4647                         new_checked = div64_s64(new_checked, duration);
4648
4649                 if (rtime != 0)
4650                         speed = div64_s64(speed, rtime);
4651
4652                 lfsck_namespace_dump_statistics(m, ns, checked, 0, rtime, 0,
4653                                                 bk->lb_param & LPF_DRYRUN);
4654                 seq_printf(m, "average_speed_phase1: %llu items/sec\n"
4655                            "average_speed_phase2: N/A\n"
4656                            "average_speed_total: %llu items/sec\n"
4657                            "real_time_speed_phase1: %llu items/sec\n"
4658                            "real_time_speed_phase2: N/A\n",
4659                            speed,
4660                            speed,
4661                            new_checked);
4662
4663                 if (likely(lfsck->li_di_oit)) {
4664                         const struct dt_it_ops *iops =
4665                                 &lfsck->li_obj_oit->do_index_ops->dio_it;
4666
4667                         /* The low layer otable-based iteration position may NOT
4668                          * exactly match the namespace-based directory traversal
4669                          * cookie. Generally, it is not a serious issue. But the
4670                          * caller should NOT make assumption on that. */
4671                         pos.lp_oit_cookie = iops->store(env, lfsck->li_di_oit);
4672                         if (!lfsck->li_current_oit_processed)
4673                                 pos.lp_oit_cookie--;
4674
4675                         spin_lock(&lfsck->li_lock);
4676                         if (lfsck->li_di_dir) {
4677                                 pos.lp_dir_cookie = lfsck->li_cookie_dir;
4678                                 if (pos.lp_dir_cookie >= MDS_DIR_END_OFF) {
4679                                         fid_zero(&pos.lp_dir_parent);
4680                                         pos.lp_dir_cookie = 0;
4681                                 } else {
4682                                         pos.lp_dir_parent =
4683                                         *lfsck_dto2fid(lfsck->li_obj_dir);
4684                                 }
4685                         } else {
4686                                 fid_zero(&pos.lp_dir_parent);
4687                                 pos.lp_dir_cookie = 0;
4688                         }
4689                         spin_unlock(&lfsck->li_lock);
4690                 } else {
4691                         pos = ns->ln_pos_last_checkpoint;
4692                 }
4693
4694                 lfsck_pos_dump(m, &pos, "current_position");
4695         } else if (ns->ln_status == LS_SCANNING_PHASE2) {
4696                 time64_t duration = ktime_get_seconds() -
4697                                     com->lc_time_last_checkpoint;
4698                 __u64 checked = ns->ln_objs_checked_phase2 +
4699                                 com->lc_new_checked;
4700                 __u64 speed1 = ns->ln_items_checked;
4701                 __u64 speed2 = checked;
4702                 __u64 speed0 = speed1 + speed2;
4703                 __u64 new_checked = com->lc_new_checked;
4704                 time64_t rtime = ns->ln_run_time_phase2 + duration;
4705                 time64_t time0 = ns->ln_run_time_phase1 + rtime;
4706
4707                 if (duration != 0)
4708                         new_checked = div64_s64(new_checked, duration);
4709
4710                 if (ns->ln_run_time_phase1 != 0)
4711                         speed1 = div64_s64(speed1, ns->ln_run_time_phase1);
4712                 else if (ns->ln_items_checked != 0)
4713                         time0++;
4714
4715                 if (rtime != 0)
4716                         speed2 = div64_s64(speed2, rtime);
4717                 else if (checked != 0)
4718                         time0++;
4719
4720                 if (time0 != 0)
4721                         speed0 = div64_s64(speed0, time0);
4722
4723                 lfsck_namespace_dump_statistics(m, ns, ns->ln_items_checked,
4724                                                 checked,
4725                                                 ns->ln_run_time_phase1, rtime,
4726                                                 bk->lb_param & LPF_DRYRUN);
4727                 seq_printf(m, "average_speed_phase1: %llu items/sec\n"
4728                            "average_speed_phase2: %llu objs/sec\n"
4729                            "average_speed_total: %llu items/sec\n"
4730                            "real_time_speed_phase1: N/A\n"
4731                            "real_time_speed_phase2: %llu objs/sec\n"
4732                            "current_position: "DFID"\n",
4733                            speed1,
4734                            speed2,
4735                            speed0,
4736                            new_checked,
4737                            PFID(&ns->ln_fid_latest_scanned_phase2));
4738         } else {
4739                 __u64 speed1 = ns->ln_items_checked;
4740                 __u64 speed2 = ns->ln_objs_checked_phase2;
4741                 __u64 speed0 = speed1 + speed2;
4742                 time64_t time0 = ns->ln_run_time_phase1 + ns->ln_run_time_phase2;
4743
4744                 if (ns->ln_run_time_phase1 != 0)
4745                         speed1 = div64_s64(speed1, ns->ln_run_time_phase1);
4746                 else if (ns->ln_items_checked != 0)
4747                         time0++;
4748
4749                 if (ns->ln_run_time_phase2 != 0)
4750                         speed2 = div64_s64(speed2, ns->ln_run_time_phase2);
4751                 else if (ns->ln_objs_checked_phase2 != 0)
4752                         time0++;
4753
4754                 if (time0 != 0)
4755                         speed0 = div64_s64(speed0, time0);
4756
4757                 lfsck_namespace_dump_statistics(m, ns, ns->ln_items_checked,
4758                                                 ns->ln_objs_checked_phase2,
4759                                                 ns->ln_run_time_phase1,
4760                                                 ns->ln_run_time_phase2,
4761                                                 bk->lb_param & LPF_DRYRUN);
4762                 seq_printf(m, "average_speed_phase1: %llu items/sec\n"
4763                            "average_speed_phase2: %llu objs/sec\n"
4764                            "average_speed_total: %llu items/sec\n"
4765                            "real_time_speed_phase1: N/A\n"
4766                            "real_time_speed_phase2: N/A\n"
4767                            "current_position: N/A\n",
4768                            speed1,
4769                            speed2,
4770                            speed0);
4771         }
4772
4773         up_read(&com->lc_sem);
4774 }
4775
4776 static int lfsck_namespace_double_scan(const struct lu_env *env,
4777                                        struct lfsck_component *com)
4778 {
4779         struct lfsck_namespace          *ns     = com->lc_file_ram;
4780         struct lfsck_assistant_data     *lad    = com->lc_data;
4781         struct lfsck_tgt_descs          *ltds   = &com->lc_lfsck->li_mdt_descs;
4782         struct lfsck_tgt_desc           *ltd;
4783         struct lfsck_tgt_desc           *next;
4784         int                              rc;
4785
4786         rc = lfsck_double_scan_generic(env, com, ns->ln_status);
4787         if (thread_is_stopped(&lad->lad_thread)) {
4788                 LASSERT(list_empty(&lad->lad_req_list));
4789                 LASSERT(list_empty(&lad->lad_mdt_phase1_list));
4790
4791                 spin_lock(&ltds->ltd_lock);
4792                 list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
4793                                          ltd_namespace_phase_list) {
4794                         list_del_init(&ltd->ltd_namespace_phase_list);
4795                 }
4796                 spin_unlock(&ltds->ltd_lock);
4797         }
4798
4799         return rc;
4800 }
4801
4802 static void lfsck_namespace_data_release(const struct lu_env *env,
4803                                          struct lfsck_component *com)
4804 {
4805         struct lfsck_assistant_data     *lad    = com->lc_data;
4806         struct lfsck_tgt_descs          *ltds   = &com->lc_lfsck->li_mdt_descs;
4807         struct lfsck_tgt_desc           *ltd;
4808         struct lfsck_tgt_desc           *next;
4809
4810         LASSERT(lad != NULL);
4811         LASSERT(thread_is_init(&lad->lad_thread) ||
4812                 thread_is_stopped(&lad->lad_thread));
4813         LASSERT(list_empty(&lad->lad_req_list));
4814
4815         com->lc_data = NULL;
4816         lfsck_namespace_release_lmv(env, com);
4817
4818         spin_lock(&ltds->ltd_lock);
4819         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase1_list,
4820                                  ltd_namespace_phase_list) {
4821                 list_del_init(&ltd->ltd_namespace_phase_list);
4822         }
4823         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
4824                                  ltd_namespace_phase_list) {
4825                 list_del_init(&ltd->ltd_namespace_phase_list);
4826         }
4827         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_list,
4828                                  ltd_namespace_list) {
4829                 list_del_init(&ltd->ltd_namespace_list);
4830         }
4831         spin_unlock(&ltds->ltd_lock);
4832
4833         if (likely(lad->lad_bitmap != NULL))
4834                 CFS_FREE_BITMAP(lad->lad_bitmap);
4835
4836         OBD_FREE_PTR(lad);
4837 }
4838
4839 static void lfsck_namespace_quit(const struct lu_env *env,
4840                                  struct lfsck_component *com)
4841 {
4842         struct lfsck_assistant_data     *lad    = com->lc_data;
4843         struct lfsck_tgt_descs          *ltds   = &com->lc_lfsck->li_mdt_descs;
4844         struct lfsck_tgt_desc           *ltd;
4845         struct lfsck_tgt_desc           *next;
4846
4847         LASSERT(lad != NULL);
4848
4849         lfsck_quit_generic(env, com);
4850
4851         LASSERT(thread_is_init(&lad->lad_thread) ||
4852                 thread_is_stopped(&lad->lad_thread));
4853         LASSERT(list_empty(&lad->lad_req_list));
4854
4855         lfsck_namespace_release_lmv(env, com);
4856
4857         spin_lock(&ltds->ltd_lock);
4858         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase1_list,
4859                                  ltd_namespace_phase_list) {
4860                 list_del_init(&ltd->ltd_namespace_phase_list);
4861         }
4862         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
4863                                  ltd_namespace_phase_list) {
4864                 list_del_init(&ltd->ltd_namespace_phase_list);
4865         }
4866         spin_unlock(&ltds->ltd_lock);
4867 }
4868
4869 static int lfsck_namespace_in_notify(const struct lu_env *env,
4870                                      struct lfsck_component *com,
4871                                      struct lfsck_request *lr)
4872 {
4873         struct lfsck_instance *lfsck = com->lc_lfsck;
4874         struct lfsck_namespace *ns = com->lc_file_ram;
4875         struct lfsck_assistant_data *lad = com->lc_data;
4876         struct lfsck_tgt_descs *ltds = &lfsck->li_mdt_descs;
4877         struct lfsck_tgt_desc *ltd;
4878         int rc = 0;
4879         bool fail = false;
4880         ENTRY;
4881
4882         switch (lr->lr_event) {
4883         case LE_SET_LMV_MASTER: {
4884                 struct dt_object        *obj;
4885
4886                 obj = lfsck_object_find_bottom(env, lfsck, &lr->lr_fid);
4887                 if (IS_ERR(obj))
4888                         RETURN(PTR_ERR(obj));
4889
4890                 if (likely(dt_object_exists(obj)))
4891                         rc = lfsck_namespace_notify_lmv_master_local(env, com,
4892                                                                      obj);
4893
4894                 lfsck_object_put(env, obj);
4895
4896                 RETURN(rc > 0 ? 0 : rc);
4897         }
4898         case LE_SET_LMV_SLAVE: {
4899                 if (!(lr->lr_flags & LEF_RECHECK_NAME_HASH))
4900                         ns->ln_striped_shards_repaired++;
4901
4902                 rc = lfsck_namespace_trace_update(env, com, &lr->lr_fid,
4903                                                   LNTF_RECHECK_NAME_HASH, true);
4904
4905                 RETURN(rc > 0 ? 0 : rc);
4906         }
4907         case LE_PHASE1_DONE:
4908         case LE_PHASE2_DONE:
4909         case LE_PEER_EXIT:
4910                 break;
4911         default:
4912                 RETURN(-EINVAL);
4913         }
4914
4915         CDEBUG(D_LFSCK, "%s: namespace LFSCK handles notify %u from MDT %x, "
4916                "status %d, flags %x\n", lfsck_lfsck2name(lfsck), lr->lr_event,
4917                lr->lr_index, lr->lr_status, lr->lr_flags2);
4918
4919         spin_lock(&ltds->ltd_lock);
4920         ltd = lfsck_ltd2tgt(ltds, lr->lr_index);
4921         if (ltd == NULL) {
4922                 spin_unlock(&ltds->ltd_lock);
4923
4924                 RETURN(-ENXIO);
4925         }
4926
4927         list_del_init(&ltd->ltd_namespace_phase_list);
4928         switch (lr->lr_event) {
4929         case LE_PHASE1_DONE:
4930                 if (lr->lr_status <= 0) {
4931                         ltd->ltd_namespace_done = 1;
4932                         list_del_init(&ltd->ltd_namespace_list);
4933                         CDEBUG(D_LFSCK, "%s: MDT %x failed/stopped at "
4934                                "phase1 for namespace LFSCK: rc = %d.\n",
4935                                lfsck_lfsck2name(lfsck),
4936                                ltd->ltd_index, lr->lr_status);
4937                         ns->ln_flags |= LF_INCOMPLETE;
4938                         fail = true;
4939                         break;
4940                 }
4941
4942                 if (lr->lr_flags2 & LF_INCOMPLETE)
4943                         ns->ln_flags |= LF_INCOMPLETE;
4944
4945                 if (list_empty(&ltd->ltd_namespace_list))
4946                         list_add_tail(&ltd->ltd_namespace_list,
4947                                       &lad->lad_mdt_list);
4948                 list_add_tail(&ltd->ltd_namespace_phase_list,
4949                               &lad->lad_mdt_phase2_list);
4950                 break;
4951         case LE_PHASE2_DONE:
4952                 ltd->ltd_namespace_done = 1;
4953                 list_del_init(&ltd->ltd_namespace_list);
4954                 break;
4955         case LE_PEER_EXIT:
4956                 fail = true;
4957                 ltd->ltd_namespace_done = 1;
4958                 list_del_init(&ltd->ltd_namespace_list);
4959                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT)) {
4960                         CDEBUG(D_LFSCK,
4961                                "%s: the peer MDT %x exit namespace LFSCK\n",
4962                                lfsck_lfsck2name(lfsck), ltd->ltd_index);
4963                         ns->ln_flags |= LF_INCOMPLETE;
4964                 }
4965                 break;
4966         default:
4967                 break;
4968         }
4969         spin_unlock(&ltds->ltd_lock);
4970
4971         if (fail && lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT) {
4972                 struct lfsck_stop *stop = &lfsck_env_info(env)->lti_stop;
4973
4974                 memset(stop, 0, sizeof(*stop));
4975                 stop->ls_status = lr->lr_status;
4976                 stop->ls_flags = lr->lr_param & ~LPF_BROADCAST;
4977                 lfsck_stop(env, lfsck->li_bottom, stop);
4978         } else if (lfsck_phase2_next_ready(lad)) {
4979                 wake_up_all(&lad->lad_thread.t_ctl_waitq);
4980         }
4981
4982         RETURN(0);
4983 }
4984
4985 static void lfsck_namespace_repaired(struct lfsck_namespace *ns, __u64 *count)
4986 {
4987         *count += ns->ln_objs_nlink_repaired;
4988         *count += ns->ln_dirent_repaired;
4989         *count += ns->ln_linkea_repaired;
4990         *count += ns->ln_mul_linked_repaired;
4991         *count += ns->ln_unmatched_pairs_repaired;
4992         *count += ns->ln_dangling_repaired;
4993         *count += ns->ln_mul_ref_repaired;
4994         *count += ns->ln_bad_type_repaired;
4995         *count += ns->ln_lost_dirent_repaired;
4996         *count += ns->ln_striped_dirs_disabled;
4997         *count += ns->ln_striped_dirs_repaired;
4998         *count += ns->ln_striped_shards_repaired;
4999         *count += ns->ln_name_hash_repaired;
5000         *count += ns->ln_local_lpf_moved;
5001 }
5002
5003 static int lfsck_namespace_query_all(const struct lu_env *env,
5004                                      struct lfsck_component *com,
5005                                      __u32 *mdts_count, __u64 *repaired)
5006 {
5007         struct lfsck_namespace *ns = com->lc_file_ram;
5008         struct lfsck_tgt_descs *ltds = &com->lc_lfsck->li_mdt_descs;
5009         struct lfsck_tgt_desc *ltd;
5010         int idx;
5011         int rc;
5012         ENTRY;
5013
5014         rc = lfsck_query_all(env, com);
5015         if (rc != 0)
5016                 RETURN(rc);
5017
5018         down_read(&ltds->ltd_rw_sem);
5019         cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
5020                 ltd = lfsck_ltd2tgt(ltds, idx);
5021                 LASSERT(ltd != NULL);
5022
5023                 mdts_count[ltd->ltd_namespace_status]++;
5024                 *repaired += ltd->ltd_namespace_repaired;
5025         }
5026         up_read(&ltds->ltd_rw_sem);
5027
5028         down_read(&com->lc_sem);
5029         mdts_count[ns->ln_status]++;
5030         lfsck_namespace_repaired(ns, repaired);
5031         up_read(&com->lc_sem);
5032
5033         RETURN(0);
5034 }
5035
5036 static int lfsck_namespace_query(const struct lu_env *env,
5037                                  struct lfsck_component *com,
5038                                  struct lfsck_request *req,
5039                                  struct lfsck_reply *rep,
5040                                  struct lfsck_query *que, int idx)
5041 {
5042         struct lfsck_namespace *ns = com->lc_file_ram;
5043         int rc = 0;
5044
5045         if (que != NULL) {
5046                 LASSERT(com->lc_lfsck->li_master);
5047
5048                 rc = lfsck_namespace_query_all(env, com,
5049                                                que->lu_mdts_count[idx],
5050                                                &que->lu_repaired[idx]);
5051         } else {
5052                 down_read(&com->lc_sem);
5053                 rep->lr_status = ns->ln_status;
5054                 if (req->lr_flags & LEF_QUERY_ALL)
5055                         lfsck_namespace_repaired(ns, &rep->lr_repaired);
5056                 up_read(&com->lc_sem);
5057         }
5058
5059         return rc;
5060 }
5061
5062 static struct lfsck_operations lfsck_namespace_ops = {
5063         .lfsck_reset            = lfsck_namespace_reset,
5064         .lfsck_fail             = lfsck_namespace_fail,
5065         .lfsck_close_dir        = lfsck_namespace_close_dir,
5066         .lfsck_open_dir         = lfsck_namespace_open_dir,
5067         .lfsck_checkpoint       = lfsck_namespace_checkpoint,
5068         .lfsck_prep             = lfsck_namespace_prep,
5069         .lfsck_exec_oit         = lfsck_namespace_exec_oit,
5070         .lfsck_exec_dir         = lfsck_namespace_exec_dir,
5071         .lfsck_post             = lfsck_namespace_post,
5072         .lfsck_dump             = lfsck_namespace_dump,
5073         .lfsck_double_scan      = lfsck_namespace_double_scan,
5074         .lfsck_data_release     = lfsck_namespace_data_release,
5075         .lfsck_quit             = lfsck_namespace_quit,
5076         .lfsck_in_notify        = lfsck_namespace_in_notify,
5077         .lfsck_query            = lfsck_namespace_query,
5078 };
5079
5080 /**
5081  * Repair dangling name entry.
5082  *
5083  * For the name entry with dangling reference, we need to repare the
5084  * inconsistency according to the LFSCK sponsor's requirement:
5085  *
5086  * 1) Keep the inconsistency there and report the inconsistency case,
5087  *    then give the chance to the application to find related issues,
5088  *    and the users can make the decision about how to handle it with
5089  *    more human knownledge. (by default)
5090  *
5091  * 2) Re-create the missing MDT-object with the FID information.
5092  *
5093  * \param[in] env       pointer to the thread context
5094  * \param[in] com       pointer to the lfsck component
5095  * \param[in] parent    pointer to the dir object that contains the dangling
5096  *                      name entry
5097  * \param[in] child     pointer to the object corresponding to the dangling
5098  *                      name entry
5099  * \param[in] lnr       pointer to the namespace request that contains the
5100  *                      name's name, parent object, parent's LMV, and ect.
5101  *
5102  * \retval              positive number if no need to repair
5103  * \retval              zero for repaired successfully
5104  * \retval              negative error number on failure
5105  */
5106 int lfsck_namespace_repair_dangling(const struct lu_env *env,
5107                                     struct lfsck_component *com,
5108                                     struct dt_object *parent,
5109                                     struct dt_object *child,
5110                                     struct lfsck_namespace_req *lnr)
5111 {
5112         struct lfsck_thread_info        *info   = lfsck_env_info(env);
5113         struct lu_attr                  *la     = &info->lti_la;
5114         struct dt_allocation_hint       *hint   = &info->lti_hint;
5115         struct dt_object_format         *dof    = &info->lti_dof;
5116         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
5117         struct lmv_mds_md_v1            *lmv2   = &info->lti_lmv2;
5118         const struct lu_name            *cname;
5119         const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
5120         const struct lu_fid             *cfid   = lfsck_dto2fid(child);
5121         struct linkea_data               ldata  = { NULL };
5122         struct lfsck_lock_handle        *llh    = &info->lti_llh;
5123         struct lu_buf                    linkea_buf;
5124         struct lu_buf                    lmv_buf;
5125         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5126         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
5127         struct dt_device                *dev    = lfsck->li_next;
5128         struct thandle                  *th     = NULL;
5129         int                              rc     = 0;
5130         __u16                            type   = lnr->lnr_type;
5131         bool                             create;
5132         ENTRY;
5133
5134         cname = lfsck_name_get_const(env, lnr->lnr_name, lnr->lnr_namelen);
5135         if (bk->lb_param & LPF_CREATE_MDTOBJ)
5136                 create = true;
5137         else
5138                 create = false;
5139
5140         if (!create || bk->lb_param & LPF_DRYRUN)
5141                 GOTO(log, rc = 0);
5142
5143         /* We may need to create the sub-objects of the @child via LOD,
5144          * so make the modification based on lfsck->li_next. */
5145
5146         parent = lfsck_object_locate(dev, parent);
5147         if (IS_ERR(parent))
5148                 GOTO(log, rc = PTR_ERR(parent));
5149
5150         if (unlikely(!dt_try_as_dir(env, parent)))
5151                 GOTO(log, rc = -ENOTDIR);
5152
5153         child = lfsck_object_locate(dev, child);
5154         if (IS_ERR(child))
5155                 GOTO(log, rc = PTR_ERR(child));
5156
5157         rc = linkea_links_new(&ldata, &info->lti_linkea_buf2,
5158                               cname, pfid);
5159         if (rc != 0)
5160                 GOTO(log, rc);
5161
5162         rc = lfsck_lock(env, lfsck, parent, lnr->lnr_name, llh,
5163                         MDS_INODELOCK_UPDATE, LCK_PR);
5164         if (rc != 0)
5165                 GOTO(log, rc);
5166
5167         rc = lfsck_namespace_check_exist(env, parent, child, lnr->lnr_name);
5168         if (rc != 0)
5169                 GOTO(log, rc);
5170
5171         /* Set the ctime as zero, then others can know it is created for
5172          * repairing dangling name entry by LFSCK. And if the LFSCK made
5173          * wrong decision and the real MDT-object has been found later,
5174          * then the LFSCK has chance to fix the incosistency properly. */
5175         memset(la, 0, sizeof(*la));
5176         la->la_mode = (type & S_IFMT) | 0600;
5177         la->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
5178                         LA_ATIME | LA_MTIME | LA_CTIME;
5179
5180         child->do_ops->do_ah_init(env, hint, parent, child,
5181                                  la->la_mode & S_IFMT);
5182
5183         memset(dof, 0, sizeof(*dof));
5184         dof->dof_type = dt_mode_to_dft(type);
5185         /* If the target is a regular file, then the LFSCK will only create
5186          * the MDT-object without stripes (dof->dof_reg.striped = 0). related
5187          * OST-objects will be created when write open. */
5188
5189         th = dt_trans_create(env, dev);
5190         if (IS_ERR(th))
5191                 GOTO(log, rc = PTR_ERR(th));
5192
5193         /* 1a. create child. */
5194         rc = dt_declare_create(env, child, la, hint, dof, th);
5195         if (rc != 0)
5196                 GOTO(stop, rc);
5197
5198         if (S_ISDIR(type)) {
5199                 if (unlikely(!dt_try_as_dir(env, child)))
5200                         GOTO(stop, rc = -ENOTDIR);
5201
5202                 /* 2a. increase child nlink */
5203                 rc = dt_declare_ref_add(env, child, th);
5204                 if (rc != 0)
5205                         GOTO(stop, rc);
5206
5207                 /* 3a. insert dot into child dir */
5208                 rec->rec_type = S_IFDIR;
5209                 rec->rec_fid = cfid;
5210                 rc = dt_declare_insert(env, child,
5211                                        (const struct dt_rec *)rec,
5212                                        (const struct dt_key *)dot, th);
5213                 if (rc != 0)
5214                         GOTO(stop, rc);
5215
5216                 /* 4a. insert dotdot into child dir */
5217                 rec->rec_fid = pfid;
5218                 rc = dt_declare_insert(env, child,
5219                                        (const struct dt_rec *)rec,
5220                                        (const struct dt_key *)dotdot, th);
5221                 if (rc != 0)
5222                         GOTO(stop, rc);
5223
5224                 /* 5a. generate slave LMV EA. */
5225                 if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
5226                         int idx;
5227
5228                         idx = lfsck_shard_name_to_index(env,
5229                                         lnr->lnr_name, lnr->lnr_namelen,
5230                                         type, cfid);
5231                         if (unlikely(idx < 0))
5232                                 GOTO(stop, rc = idx);
5233
5234                         *lmv2 = lnr->lnr_lmv->ll_lmv;
5235                         lmv2->lmv_magic = LMV_MAGIC_STRIPE;
5236                         lmv2->lmv_master_mdt_index = idx;
5237
5238                         lfsck_lmv_header_cpu_to_le(lmv2, lmv2);
5239                         lfsck_buf_init(&lmv_buf, lmv2, sizeof(*lmv2));
5240                         rc = dt_declare_xattr_set(env, child, &lmv_buf,
5241                                                   XATTR_NAME_LMV, 0, th);
5242                         if (rc != 0)
5243                                 GOTO(stop, rc);
5244                 }
5245         }
5246
5247         /* 6a. insert linkEA for child */
5248         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
5249                        ldata.ld_leh->leh_len);
5250         rc = dt_declare_xattr_set(env, child, &linkea_buf,
5251                                   XATTR_NAME_LINK, 0, th);
5252         if (rc != 0)
5253                 GOTO(stop, rc);
5254
5255         rc = dt_trans_start_local(env, dev, th);
5256         if (rc != 0)
5257                 GOTO(stop, rc = (rc == -EEXIST ? 1 : rc));
5258
5259         dt_write_lock(env, child, 0);
5260         /* 1b. create child */
5261         rc = dt_create(env, child, la, hint, dof, th);
5262         if (rc != 0)
5263                 GOTO(unlock, rc = (rc == -EEXIST ? 1 : rc));
5264
5265         if (S_ISDIR(type)) {
5266                 /* 2b. increase child nlink */
5267                 rc = dt_ref_add(env, child, th);
5268                 if (rc != 0)
5269                         GOTO(unlock, rc);
5270
5271                 /* 3b. insert dot into child dir */
5272                 rec->rec_type = S_IFDIR;
5273                 rec->rec_fid = cfid;
5274                 rc = dt_insert(env, child, (const struct dt_rec *)rec,
5275                                (const struct dt_key *)dot, th);
5276                 if (rc != 0)
5277                         GOTO(unlock, rc);
5278
5279                 /* 4b. insert dotdot into child dir */
5280                 rec->rec_fid = pfid;
5281                 rc = dt_insert(env, child, (const struct dt_rec *)rec,
5282                                (const struct dt_key *)dotdot, th);
5283                 if (rc != 0)
5284                         GOTO(unlock, rc);
5285
5286                 /* 5b. generate slave LMV EA. */
5287                 if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
5288                         rc = dt_xattr_set(env, child, &lmv_buf, XATTR_NAME_LMV,
5289                                           0, th);
5290                         if (rc != 0)
5291                                 GOTO(unlock, rc);
5292                 }
5293         }
5294
5295         /* 6b. insert linkEA for child. */
5296         rc = dt_xattr_set(env, child, &linkea_buf,
5297                           XATTR_NAME_LINK, 0, th);
5298
5299         GOTO(unlock, rc);
5300
5301 unlock:
5302         dt_write_unlock(env, child);
5303
5304 stop:
5305         dt_trans_stop(env, dev, th);
5306
5307 log:
5308         lfsck_unlock(llh);
5309         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found dangling "
5310                "reference for: parent "DFID", child "DFID", type %u, "
5311                "name %s. %s: rc = %d\n", lfsck_lfsck2name(lfsck),
5312                PFID(pfid), PFID(cfid), type, cname->ln_name,
5313                create ? "Create the lost MDT-object as required" :
5314                         "Keep the MDT-object there by default", rc);
5315
5316         if (rc <= 0) {
5317                 struct lfsck_namespace *ns = com->lc_file_ram;
5318
5319                 ns->ln_flags |= LF_INCONSISTENT;
5320         }
5321
5322         return rc;
5323 }
5324
5325 static int lfsck_namespace_assistant_handler_p1(const struct lu_env *env,
5326                                                 struct lfsck_component *com,
5327                                                 struct lfsck_assistant_req *lar)
5328 {
5329         struct lfsck_thread_info   *info     = lfsck_env_info(env);
5330         struct lu_attr             *la       = &info->lti_la;
5331         struct lfsck_instance      *lfsck    = com->lc_lfsck;
5332         struct lfsck_bookmark      *bk       = &lfsck->li_bookmark_ram;
5333         struct lfsck_namespace     *ns       = com->lc_file_ram;
5334         struct lfsck_assistant_data *lad     = com->lc_data;
5335         struct linkea_data          ldata    = { NULL };
5336         const struct lu_name       *cname;
5337         struct thandle             *handle   = NULL;
5338         struct lfsck_namespace_req *lnr      =
5339                         container_of0(lar, struct lfsck_namespace_req, lnr_lar);
5340         struct dt_object           *dir      = NULL;
5341         struct dt_object           *obj      = NULL;
5342         struct lfsck_assistant_object *lso   = lar->lar_parent;
5343         const struct lu_fid        *pfid     = &lso->lso_fid;
5344         struct dt_device           *dev      = NULL;
5345         struct lustre_handle        lh       = { 0 };
5346         bool                        repaired = false;
5347         bool                        dtlocked = false;
5348         bool                        remove;
5349         bool                        newdata;
5350         bool                        log      = false;
5351         bool                        bad_hash = false;
5352         bool                        bad_linkea = false;
5353         int                         idx      = 0;
5354         int                         count    = 0;
5355         int                         rc       = 0;
5356         enum lfsck_namespace_inconsistency_type type = LNIT_NONE;
5357         ENTRY;
5358
5359         if (lso->lso_dead)
5360                 RETURN(0);
5361
5362         la->la_nlink = 0;
5363         if (lnr->lnr_attr & LUDA_UPGRADE) {
5364                 ns->ln_flags |= LF_UPGRADE;
5365                 ns->ln_dirent_repaired++;
5366                 repaired = true;
5367         } else if (lnr->lnr_attr & LUDA_REPAIR) {
5368                 ns->ln_flags |= LF_INCONSISTENT;
5369                 ns->ln_dirent_repaired++;
5370                 repaired = true;
5371         }
5372
5373         if (unlikely(fid_is_zero(&lnr->lnr_fid))) {
5374                 if (strcmp(lnr->lnr_name, dotdot) != 0)
5375                         LBUG();
5376                 else
5377                         rc = lfsck_namespace_trace_update(env, com, pfid,
5378                                                 LNTF_CHECK_PARENT, true);
5379
5380                 GOTO(out, rc);
5381         }
5382
5383         if (unlikely(!fid_is_sane(&lnr->lnr_fid))) {
5384                 CDEBUG(D_LFSCK, "%s: dir scan find invalid FID "DFID
5385                        " for the name entry %.*s under "DFID"\n",
5386                        lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid),
5387                        lnr->lnr_namelen, lnr->lnr_name, PFID(pfid));
5388
5389                 if (strcmp(lnr->lnr_name, dotdot) != 0)
5390                         /* invalid FID means bad name entry, remove it. */
5391                         type = LNIT_BAD_DIRENT;
5392                 else
5393                         /* If the parent FID is invalid, we cannot remove
5394                          * the ".." entry directly. */
5395                         rc = lfsck_namespace_trace_update(env, com, pfid,
5396                                                 LNTF_CHECK_PARENT, true);
5397
5398                 GOTO(out, rc);
5399         }
5400
5401         if (unlikely(lnr->lnr_dir_cookie == MDS_DIR_END_OFF)) {
5402                 rc = lfsck_namespace_striped_dir_rescan(env, com, lnr);
5403
5404                 RETURN(rc);
5405         }
5406
5407         if (fid_seq_is_dot(fid_seq(&lnr->lnr_fid)))
5408                 GOTO(out, rc = 0);
5409
5410         if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
5411                 rc = lfsck_namespace_handle_striped_master(env, com, lnr);
5412
5413                 RETURN(rc);
5414         }
5415
5416         idx = lfsck_find_mdt_idx_by_fid(env, lfsck, &lnr->lnr_fid);
5417         if (idx < 0)
5418                 GOTO(out, rc = idx);
5419
5420         if (idx == lfsck_dev_idx(lfsck)) {
5421                 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0))
5422                         GOTO(out, rc = 0);
5423
5424                 dev = lfsck->li_bottom;
5425         } else {
5426                 struct lfsck_tgt_desc *ltd;
5427
5428                 /* Usually, some local filesystem consistency verification
5429                  * tools can guarantee the local namespace tree consistenct.
5430                  * So the LFSCK will only verify the remote directory. */
5431                 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0)) {
5432                         rc = lfsck_namespace_trace_update(env, com, pfid,
5433                                                 LNTF_CHECK_PARENT, true);
5434
5435                         GOTO(out, rc);
5436                 }
5437
5438                 ltd = lfsck_ltd2tgt(&lfsck->li_mdt_descs, idx);
5439                 if (unlikely(ltd == NULL)) {
5440                         CDEBUG(D_LFSCK, "%s: cannot talk with MDT %x which "
5441                                "did not join the namespace LFSCK\n",
5442                                lfsck_lfsck2name(lfsck), idx);
5443                         lfsck_lad_set_bitmap(env, com, idx);
5444
5445                         GOTO(out, rc = -ENODEV);
5446                 }
5447
5448                 dev = ltd->ltd_tgt;
5449         }
5450
5451         obj = lfsck_object_find_by_dev(env, dev, &lnr->lnr_fid);
5452         if (IS_ERR(obj))
5453                 GOTO(out, rc = PTR_ERR(obj));
5454
5455         cname = lfsck_name_get_const(env, lnr->lnr_name, lnr->lnr_namelen);
5456         if (dt_object_exists(obj) == 0) {
5457
5458 dangling:
5459                 if (dir == NULL) {
5460                         dir = lfsck_assistant_object_load(env, lfsck, lso);
5461                         if (IS_ERR(dir)) {
5462                                 rc = PTR_ERR(dir);
5463
5464                                 GOTO(trace, rc == -ENOENT ? 0 : rc);
5465                         }
5466                 }
5467
5468                 rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
5469                 if (rc == 0) {
5470                         if (!lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
5471                                         lnr->lnr_name, lnr->lnr_namelen)) {
5472                                 type = LNIT_BAD_DIRENT;
5473
5474                                 GOTO(out, rc);
5475                         }
5476
5477                         type = LNIT_DANGLING;
5478                         rc = lfsck_namespace_repair_dangling(env, com, dir,
5479                                                              obj, lnr);
5480                         if (rc == 0)
5481                                 repaired = true;
5482                 }
5483
5484                 GOTO(out, rc);
5485         }
5486
5487         if (!(bk->lb_param & LPF_DRYRUN) && lad->lad_advance_lock) {
5488
5489 again:
5490                 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
5491                                       MDS_INODELOCK_UPDATE |
5492                                       MDS_INODELOCK_XATTR, LCK_EX);
5493                 if (rc != 0)
5494                         GOTO(out, rc);
5495
5496                 handle = dt_trans_create(env, dev);
5497                 if (IS_ERR(handle))
5498                         GOTO(out, rc = PTR_ERR(handle));
5499
5500                 rc = lfsck_declare_namespace_exec_dir(env, obj, handle);
5501                 if (rc != 0)
5502                         GOTO(stop, rc);
5503
5504                 rc = dt_trans_start_local(env, dev, handle);
5505                 if (rc != 0)
5506                         GOTO(stop, rc);
5507
5508                 dt_write_lock(env, obj, 0);
5509                 dtlocked = true;
5510         }
5511
5512         rc = lfsck_links_read(env, obj, &ldata);
5513         if (unlikely(rc == -ENOENT)) {
5514                 if (handle != NULL) {
5515                         dt_write_unlock(env, obj);
5516                         dtlocked = false;
5517
5518                         dt_trans_stop(env, dev, handle);
5519                         handle = NULL;
5520
5521                         lfsck_ibits_unlock(&lh, LCK_EX);
5522                 }
5523
5524                 /* It may happen when the remote object has been removed,
5525                  * but the local MDT is not aware of that. */
5526                 goto dangling;
5527         } else if (rc == 0) {
5528                 count = ldata.ld_leh->leh_reccount;
5529                 rc = linkea_links_find(&ldata, cname, pfid);
5530                 if ((rc == 0) &&
5531                     (count == 1 || !S_ISDIR(lfsck_object_type(obj)))) {
5532                         if ((lfsck_object_type(obj) & S_IFMT) !=
5533                             lnr->lnr_type) {
5534                                 ns->ln_flags |= LF_INCONSISTENT;
5535                                 type = LNIT_BAD_TYPE;
5536                         }
5537
5538                         goto stop;
5539                 }
5540
5541                 /* If the name entry hash does not match the slave striped
5542                  * directory, and the name entry does not match also, then
5543                  * it is quite possible that name entry is corrupted. */
5544                 if (!lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
5545                                         lnr->lnr_name, lnr->lnr_namelen)) {
5546                         ns->ln_flags |= LF_INCONSISTENT;
5547                         type = LNIT_BAD_DIRENT;
5548
5549                         GOTO(stop, rc = 0);
5550                 }
5551
5552                 /* If the file type stored in the name entry does not match
5553                  * the file type claimed by the object, and the object does
5554                  * not recognize the name entry, then it is quite possible
5555                  * that the name entry is corrupted. */
5556                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type) {
5557                         ns->ln_flags |= LF_INCONSISTENT;
5558                         type = LNIT_BAD_DIRENT;
5559
5560                         GOTO(stop, rc = 0);
5561                 }
5562
5563                 /* For sub-dir object, we cannot make sure whether the sub-dir
5564                  * back references the parent via ".." name entry correctly or
5565                  * not in the LFSCK first-stage scanning. It may be that the
5566                  * (remote) sub-dir ".." name entry has no parent FID after
5567                  * file-level backup/restore and its linkEA may be wrong.
5568                  * So under such case, we should replace the linkEA according
5569                  * to current name entry. But this needs to be done during the
5570                  * LFSCK second-stage scanning. The LFSCK will record the name
5571                  * entry for further possible using. */
5572                 remove = false;
5573                 newdata = false;
5574                 goto nodata;
5575         } else if (unlikely(rc == -EINVAL)) {
5576                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type)
5577                         type = LNIT_BAD_TYPE;
5578
5579                 count = 1;
5580                 /* The magic crashed, we are not sure whether there are more
5581                  * corrupt data in the linkea, so remove all linkea entries. */
5582                 remove = true;
5583                 newdata = true;
5584                 goto nodata;
5585         } else if (rc == -ENODATA) {
5586                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type)
5587                         type = LNIT_BAD_TYPE;
5588
5589                 count = 1;
5590                 remove = false;
5591                 newdata = true;
5592
5593 nodata:
5594                 if (bk->lb_param & LPF_DRYRUN) {
5595                         if (rc == -ENODATA)
5596                                 ns->ln_flags |= LF_UPGRADE;
5597                         else
5598                                 ns->ln_flags |= LF_INCONSISTENT;
5599                         ns->ln_linkea_repaired++;
5600                         repaired = true;
5601                         log = true;
5602                         goto stop;
5603                 }
5604
5605                 if (!lustre_handle_is_used(&lh)) {
5606                         remove = false;
5607                         newdata = false;
5608                         type = LNIT_NONE;
5609
5610                         goto again;
5611                 }
5612
5613                 LASSERT(handle != NULL);
5614
5615                 if (dir == NULL) {
5616                         dir = lfsck_assistant_object_load(env, lfsck, lso);
5617                         if (IS_ERR(dir)) {
5618                                 rc = PTR_ERR(dir);
5619
5620                                 GOTO(stop, rc == -ENOENT ? 0 : rc);
5621                         }
5622                 }
5623
5624                 rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
5625                 if (rc != 0)
5626                         GOTO(stop, rc);
5627
5628                 bad_linkea = true;
5629                 if (!remove && newdata)
5630                         ns->ln_flags |= LF_UPGRADE;
5631                 else if (remove || !(ns->ln_flags & LF_UPGRADE))
5632                         ns->ln_flags |= LF_INCONSISTENT;
5633
5634                 if (remove) {
5635                         LASSERT(newdata);
5636
5637                         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, handle);
5638                         if (rc != 0 && rc != -ENOENT && rc != -ENODATA)
5639                                 GOTO(stop, rc);
5640                 }
5641
5642                 if (newdata) {
5643                         rc = linkea_data_new(&ldata,
5644                                         &lfsck_env_info(env)->lti_linkea_buf);
5645                         if (rc != 0)
5646                                 GOTO(stop, rc);
5647                 }
5648
5649                 rc = linkea_add_buf(&ldata, cname, pfid);
5650                 if (rc == 0)
5651                         rc = lfsck_links_write(env, obj, &ldata, handle);
5652                 if (rc != 0)
5653                         GOTO(stop, rc);
5654
5655                 count = ldata.ld_leh->leh_reccount;
5656                 if (!S_ISDIR(lfsck_object_type(obj)) ||
5657                     !dt_object_remote(obj)) {
5658                         ns->ln_linkea_repaired++;
5659                         repaired = true;
5660                         log = true;
5661                 }
5662         } else {
5663                 GOTO(stop, rc);
5664         }
5665
5666 stop:
5667         if (dtlocked)
5668                 dt_write_unlock(env, obj);
5669
5670         if (handle != NULL && !IS_ERR(handle))
5671                 dt_trans_stop(env, dev, handle);
5672
5673 out:
5674         lfsck_ibits_unlock(&lh, LCK_EX);
5675
5676         if (!name_is_dot_or_dotdot(lnr->lnr_name, lnr->lnr_namelen) &&
5677             !lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
5678                                              lnr->lnr_name, lnr->lnr_namelen) &&
5679             type != LNIT_BAD_DIRENT) {
5680                 ns->ln_flags |= LF_INCONSISTENT;
5681
5682                 log = false;
5683                 if (dir == NULL) {
5684                         dir = lfsck_assistant_object_load(env, lfsck, lso);
5685                         if (IS_ERR(dir)) {
5686                                 rc = PTR_ERR(dir);
5687
5688                                 GOTO(trace, rc == -ENOENT ? 0 : rc);
5689                         }
5690                 }
5691
5692                 rc = lfsck_namespace_repair_bad_name_hash(env, com, dir,
5693                                                 lnr->lnr_lmv, lnr->lnr_name);
5694                 if (rc == 0)
5695                         bad_hash = true;
5696         }
5697
5698         if (rc >= 0) {
5699                 if (type != LNIT_NONE && dir == NULL) {
5700                         dir = lfsck_assistant_object_load(env, lfsck, lso);
5701                         if (IS_ERR(dir)) {
5702                                 rc = PTR_ERR(dir);
5703
5704                                 GOTO(trace, rc == -ENOENT ? 0 : rc);
5705                         }
5706                 }
5707
5708                 switch (type) {
5709                 case LNIT_BAD_TYPE:
5710                         log = false;
5711                         rc = lfsck_namespace_repair_dirent(env, com, dir,
5712                                         obj, lnr->lnr_name, lnr->lnr_name,
5713                                         lnr->lnr_type, true, false);
5714                         if (rc > 0)
5715                                 repaired = true;
5716                         break;
5717                 case LNIT_BAD_DIRENT:
5718                         log = false;
5719                         /* XXX: This is a bad dirent, we do not know whether
5720                          *      the original name entry reference a regular
5721                          *      file or a directory, then keep the parent's
5722                          *      nlink count unchanged here. */
5723                         rc = lfsck_namespace_repair_dirent(env, com, dir,
5724                                         obj, lnr->lnr_name, lnr->lnr_name,
5725                                         lnr->lnr_type, false, false);
5726                         if (rc > 0)
5727                                 repaired = true;
5728                         break;
5729                 default:
5730                         break;
5731                 }
5732
5733                 if (obj != NULL && count == 1 &&
5734                     S_ISREG(lfsck_object_type(obj)))
5735                         dt_attr_get(env, obj, la);
5736         }
5737
5738 trace:
5739         down_write(&com->lc_sem);
5740         if (rc < 0) {
5741                 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail to handle "
5742                        "the entry: "DFID", parent "DFID", name %.*s: rc = %d\n",
5743                        lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid), PFID(pfid),
5744                        lnr->lnr_namelen, lnr->lnr_name, rc);
5745
5746                 lfsck_namespace_record_failure(env, lfsck, ns);
5747                 if ((rc == -ENOTCONN || rc == -ESHUTDOWN || rc == -EREMCHG ||
5748                      rc == -ETIMEDOUT || rc == -EHOSTDOWN ||
5749                      rc == -EHOSTUNREACH || rc == -EINPROGRESS) &&
5750                     dev != NULL && dev != lfsck->li_bottom)
5751                         lfsck_lad_set_bitmap(env, com, idx);
5752
5753                 if (!(bk->lb_param & LPF_FAILOUT))
5754                         rc = 0;
5755         } else {
5756                 if (repaired) {
5757                         ns->ln_items_repaired++;
5758                         if (log)
5759                                 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant "
5760                                        "repaired the entry: "DFID", parent "DFID
5761                                        ", name %.*s, type %d\n",
5762                                        lfsck_lfsck2name(lfsck),
5763                                        PFID(&lnr->lnr_fid), PFID(pfid),
5764                                        lnr->lnr_namelen, lnr->lnr_name, type);
5765
5766                         switch (type) {
5767                         case LNIT_DANGLING:
5768                                 ns->ln_dangling_repaired++;
5769                                 break;
5770                         case LNIT_BAD_TYPE:
5771                                 ns->ln_bad_type_repaired++;
5772                                 break;
5773                         case LNIT_BAD_DIRENT:
5774                                 ns->ln_dirent_repaired++;
5775                                 break;
5776                         default:
5777                                 break;
5778                         }
5779
5780                         if (bk->lb_param & LPF_DRYRUN &&
5781                             lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
5782                                 lfsck_pos_fill(env, lfsck,
5783                                                &ns->ln_pos_first_inconsistent,
5784                                                false);
5785                 }
5786
5787                 if (bad_hash) {
5788                         ns->ln_name_hash_repaired++;
5789
5790                         /* Not count repeatedly. */
5791                         if (!repaired) {
5792                                 ns->ln_items_repaired++;
5793                                 if (log)
5794                                         CDEBUG(D_LFSCK, "%s: namespace LFSCK "
5795                                                "assistant repaired the entry: "
5796                                                DFID", parent "DFID
5797                                                ", name %.*s\n",
5798                                                lfsck_lfsck2name(lfsck),
5799                                                PFID(&lnr->lnr_fid), PFID(pfid),
5800                                                lnr->lnr_namelen, lnr->lnr_name);
5801                         }
5802
5803                         if (bk->lb_param & LPF_DRYRUN &&
5804                             lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
5805                                 lfsck_pos_fill(env, lfsck,
5806                                                &ns->ln_pos_first_inconsistent,
5807                                                false);
5808                 }
5809
5810                 rc = 0;
5811         }
5812
5813         if (count > 1 || la->la_nlink > 1)
5814                 ns->ln_mul_linked_checked++;
5815
5816         up_write(&com->lc_sem);
5817
5818         if (obj != NULL && !IS_ERR(obj))
5819                 lfsck_object_put(env, obj);
5820
5821         if (dir != NULL && !IS_ERR(dir))
5822                 lfsck_object_put(env, dir);
5823
5824         lad->lad_advance_lock = bad_linkea;
5825
5826         return rc;
5827 }
5828
5829 /**
5830  * Handle one orphan under the backend /lost+found directory
5831  *
5832  * Insert the orphan FID into the namespace LFSCK trace file for further
5833  * processing (via the subsequent namespace LFSCK second-stage scanning).
5834  * At the same time, remove the orphan name entry from backend /lost+found
5835  * directory. There is an interval between the orphan name entry removed
5836  * from the backend /lost+found directory and the orphan FID in the LFSCK
5837  * trace file handled. In such interval, the LFSCK can be reset, then
5838  * all the FIDs recorded in the namespace LFSCK trace file will be dropped.
5839  * To guarantee that the orphans can be found when LFSCK run next time
5840  * without e2fsck again, when remove the orphan name entry, the LFSCK
5841  * will set the orphan's ctime attribute as 1. Since normal applications
5842  * cannot change the object's ctime attribute as 1. Then when LFSCK run
5843  * next time, it can record the object (that ctime is 1) in the namespace
5844  * LFSCK trace file during the first-stage scanning.
5845  *
5846  * \param[in] env       pointer to the thread context
5847  * \param[in] com       pointer to the lfsck component
5848  * \param[in] parent    pointer to the object for the backend /lost+found
5849  * \param[in] ent       pointer to the name entry for the target under the
5850  *                      backend /lost+found
5851  *
5852  * \retval              positive for repaired
5853  * \retval              0 if needs to repair nothing
5854  * \retval              negative error number on failure
5855  */
5856 static int lfsck_namespace_scan_local_lpf_one(const struct lu_env *env,
5857                                               struct lfsck_component *com,
5858                                               struct dt_object *parent,
5859                                               struct lu_dirent *ent)
5860 {
5861         struct lfsck_thread_info        *info   = lfsck_env_info(env);
5862         struct lu_fid                   *key    = &info->lti_fid;
5863         struct lu_attr                  *la     = &info->lti_la;
5864         struct lfsck_instance           *lfsck  = com->lc_lfsck;
5865         struct dt_object                *obj;
5866         struct dt_device                *dev    = lfsck->li_bottom;
5867         struct dt_object                *child  = NULL;
5868         struct thandle                  *th     = NULL;
5869         int                              idx;
5870         int                              rc     = 0;
5871         __u8                             flags  = 0;
5872         bool                             exist  = false;
5873         ENTRY;
5874
5875         child = lfsck_object_find_by_dev(env, dev, &ent->lde_fid);
5876         if (IS_ERR(child))
5877                 RETURN(PTR_ERR(child));
5878
5879         LASSERT(dt_object_exists(child));
5880         LASSERT(!dt_object_remote(child));
5881
5882         idx = lfsck_sub_trace_file_fid2idx(&ent->lde_fid);
5883         obj = com->lc_sub_trace_objs[idx].lsto_obj;
5884         fid_cpu_to_be(key, &ent->lde_fid);
5885         rc = dt_lookup(env, obj, (struct dt_rec *)&flags,
5886                        (const struct dt_key *)key);
5887         if (rc == 0) {
5888                 exist = true;
5889                 flags |= LNTF_CHECK_ORPHAN;
5890         } else if (rc == -ENOENT) {
5891                 flags = LNTF_CHECK_ORPHAN;
5892         } else {
5893                 GOTO(out, rc);
5894         }
5895
5896         th = dt_trans_create(env, dev);
5897         if (IS_ERR(th))
5898                 GOTO(out, rc = PTR_ERR(th));
5899
5900         /* a1. remove name entry from backend /lost+found */
5901         rc = dt_declare_delete(env, parent,
5902                                (const struct dt_key *)ent->lde_name, th);
5903         if (rc != 0)
5904                 GOTO(stop, rc);
5905
5906         if (S_ISDIR(lfsck_object_type(child))) {
5907                 /* a2. decrease parent's nlink */
5908                 rc = dt_declare_ref_del(env, parent, th);
5909                 if (rc != 0)
5910                         GOTO(stop, rc);
5911         }
5912
5913         if (exist) {
5914                 /* a3. remove child's FID from the LFSCK trace file. */
5915                 rc = dt_declare_delete(env, obj,
5916                                        (const struct dt_key *)key, th);
5917                 if (rc != 0)
5918                         GOTO(stop, rc);
5919         } else {
5920                 /* a4. set child's ctime as 1 */
5921                 memset(la, 0, sizeof(*la));
5922                 la->la_ctime = 1;
5923                 la->la_valid = LA_CTIME;
5924                 rc = dt_declare_attr_set(env, child, la, th);
5925                 if (rc != 0)
5926                         GOTO(stop, rc);
5927         }
5928
5929         /* a5. insert child's FID into the LFSCK trace file. */
5930         rc = dt_declare_insert(env, obj, (const struct dt_rec *)&flags,
5931                                (const struct dt_key *)key, th);
5932         if (rc != 0)
5933                 GOTO(stop, rc);
5934
5935         rc = dt_trans_start_local(env, dev, th);
5936         if (rc != 0)
5937                 GOTO(stop, rc);
5938
5939         /* b1. remove name entry from backend /lost+found */
5940         rc = dt_delete(env, parent, (const struct dt_key *)ent->lde_name, th);
5941         if (rc != 0)
5942                 GOTO(stop, rc);
5943
5944         if (S_ISDIR(lfsck_object_type(child))) {
5945                 /* b2. decrease parent's nlink */
5946                 dt_write_lock(env, parent, 0);
5947                 rc = dt_ref_del(env, parent, th);
5948                 dt_write_unlock(env, parent);
5949                 if (rc != 0)
5950                         GOTO(stop, rc);
5951         }
5952
5953         if (exist) {
5954                 /* a3. remove child's FID from the LFSCK trace file. */
5955                 rc = dt_delete(env, obj, (const struct dt_key *)key, th);
5956                 if (rc != 0)
5957                         GOTO(stop, rc);
5958         } else {
5959                 /* b4. set child's ctime as 1 */
5960                 rc = dt_attr_set(env, child, la, th);
5961                 if (rc != 0)
5962                         GOTO(stop, rc);
5963         }
5964
5965         /* b5. insert child's FID into the LFSCK trace file. */
5966         rc = dt_insert(env, obj, (const struct dt_rec *)&flags,
5967                        (const struct dt_key *)key, th);
5968
5969         GOTO(stop, rc = (rc == 0 ? 1 : rc));
5970
5971 stop:
5972         dt_trans_stop(env, dev, th);
5973
5974 out:
5975         lfsck_object_put(env, child);
5976
5977         return rc;
5978 }
5979
5980 /**
5981  * Handle orphans under the backend /lost+found directory
5982  *
5983  * Some backend checker, such as e2fsck for ldiskfs may find some orphans
5984  * and put them under the backend /lost+found directory that is invisible
5985  * to client. The LFSCK will scan such directory, for the original client
5986  * visible orphans, add their fids into the namespace LFSCK trace file,
5987  * then the subsenquent namespace LFSCK second-stage scanning can handle
5988  * them as other objects to be double scanned: either move back to normal
5989  * namespace, or to the global visible orphan directory:
5990  * /ROOT/.lustre/lost+found/MDTxxxx/
5991  *
5992  * \param[in] env       pointer to the thread context
5993  * \param[in] com       pointer to the lfsck component
5994  */
5995 static void lfsck_namespace_scan_local_lpf(const struct lu_env *env,
5996                                            struct lfsck_component *com)
5997 {
5998         struct lfsck_thread_info        *info   = lfsck_env_info(env);
5999         struct lu_dirent                *ent    =
6000                                         (struct lu_dirent *)info->lti_key;
6001         struct lu_seq_range             *range  = &info->lti_range;
6002         struct lfsck_instance           *lfsck  = com->lc_lfsck;
6003         struct ptlrpc_thread            *thread = &lfsck->li_thread;
6004         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
6005         struct lfsck_namespace          *ns     = com->lc_file_ram;
6006         struct dt_object                *parent;
6007         const struct dt_it_ops          *iops;
6008         struct dt_it                    *di;
6009         struct seq_server_site          *ss     = lfsck_dev_site(lfsck);
6010         __u64                            cookie;
6011         __u32                            idx    = lfsck_dev_idx(lfsck);
6012         int                              rc     = 0;
6013         __u16                            type;
6014         ENTRY;
6015
6016         parent = lfsck_object_find_by_dev(env, lfsck->li_bottom,
6017                                           &LU_BACKEND_LPF_FID);
6018         if (IS_ERR(parent)) {
6019                 CERROR("%s: fail to find backend /lost+found: rc = %ld\n",
6020                        lfsck_lfsck2name(lfsck), PTR_ERR(parent));
6021                 RETURN_EXIT;
6022         }
6023
6024         /* It is normal that the /lost+found does not exist for ZFS backend. */
6025         if (!dt_object_exists(parent))
6026                 GOTO(out, rc = 0);
6027
6028         if (unlikely(!dt_try_as_dir(env, parent)))
6029                 GOTO(out, rc = -ENOTDIR);
6030
6031         CDEBUG(D_LFSCK, "%s: start to scan backend /lost+found\n",
6032                lfsck_lfsck2name(lfsck));
6033
6034         com->lc_new_scanned = 0;
6035         iops = &parent->do_index_ops->dio_it;
6036         di = iops->init(env, parent, LUDA_64BITHASH | LUDA_TYPE);
6037         if (IS_ERR(di))
6038                 GOTO(out, rc = PTR_ERR(di));
6039
6040         rc = iops->load(env, di, 0);
6041         if (rc == 0)
6042                 rc = iops->next(env, di);
6043         else if (rc > 0)
6044                 rc = 0;
6045
6046         while (rc == 0) {
6047                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY3, cfs_fail_val) &&
6048                     unlikely(!thread_is_running(thread)))
6049                         break;
6050
6051                 rc = iops->rec(env, di, (struct dt_rec *)ent,
6052                                LUDA_64BITHASH | LUDA_TYPE);
6053                 if (rc == 0)
6054                         rc = lfsck_unpack_ent(ent, &cookie, &type);
6055
6056                 if (unlikely(rc != 0)) {
6057                         CDEBUG(D_LFSCK, "%s: fail to iterate backend "
6058                                "/lost+found: rc = %d\n",
6059                                lfsck_lfsck2name(lfsck), rc);
6060
6061                         goto skip;
6062                 }
6063
6064                 /* skip dot and dotdot entries */
6065                 if (name_is_dot_or_dotdot(ent->lde_name, ent->lde_namelen))
6066                         goto next;
6067
6068                 if (!fid_seq_in_fldb(fid_seq(&ent->lde_fid)))
6069                         goto skip;
6070
6071                 if (fid_is_norm(&ent->lde_fid)) {
6072                         fld_range_set_mdt(range);
6073                         rc = fld_local_lookup(env, ss->ss_server_fld,
6074                                               fid_seq(&ent->lde_fid), range);
6075                         if (rc != 0)
6076                                 goto skip;
6077                 } else if (idx != 0) {
6078                         /* If the returned FID is IGIF, then there are three
6079                          * possible cases:
6080                          *
6081                          * 1) The object is upgraded from old Lustre-1.8 with
6082                          *    IGIF assigned to such object.
6083                          * 2) The object is a backend local object and is
6084                          *    invisible to client.
6085                          * 3) The object lost its LMV EA, and since there is
6086                          *    no FID-in-dirent for the orphan in the backend
6087                          *    /lost+found directory, then the low layer will
6088                          *    return IGIF for such object.
6089                          *
6090                          * For MDTx (x != 0), it is either case 2) or case 3),
6091                          * but from the LFSCK view, they are indistinguishable.
6092                          * To be safe, the LFSCK will keep it there and report
6093                          * some message, then the adminstrator can handle that
6094                          * furtherly.
6095                          *
6096                          * For MDT0, it is more possible the case 1). The LFSCK
6097                          * will handle the orphan as an upgraded object. */
6098                         CDEBUG(D_LFSCK, "%s: the orphan %.*s with IGIF "DFID
6099                                "in the backend /lost+found on the MDT %04x, "
6100                                "to be safe, skip it.\n",
6101                                lfsck_lfsck2name(lfsck), ent->lde_namelen,
6102                                ent->lde_name, PFID(&ent->lde_fid), idx);
6103                         goto skip;
6104                 }
6105
6106                 rc = lfsck_namespace_scan_local_lpf_one(env, com, parent, ent);
6107
6108 skip:
6109                 down_write(&com->lc_sem);
6110                 com->lc_new_scanned++;
6111                 ns->ln_local_lpf_scanned++;
6112                 if (rc > 0)
6113                         ns->ln_local_lpf_moved++;
6114                 else if (rc == 0)
6115                         ns->ln_local_lpf_skipped++;
6116                 else
6117                         ns->ln_local_lpf_failed++;
6118                 up_write(&com->lc_sem);
6119
6120                 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
6121                         break;
6122
6123 next:
6124                 lfsck_control_speed_by_self(com);
6125                 if (unlikely(!thread_is_running(thread))) {
6126                         rc = 0;
6127                         break;
6128                 }
6129
6130                 rc = iops->next(env, di);
6131         }
6132
6133         iops->put(env, di);
6134         iops->fini(env, di);
6135
6136         EXIT;
6137
6138 out:
6139         CDEBUG(D_LFSCK, "%s: stop to scan backend /lost+found: rc = %d\n",
6140                lfsck_lfsck2name(lfsck), rc);
6141
6142         lfsck_object_put(env, parent);
6143 }
6144
6145 /**
6146  * Rescan the striped directory after the master LMV EA reset.
6147  *
6148  * Sometimes, the master LMV EA of the striped directory maybe lost, so when
6149  * the namespace LFSCK engine scan the striped directory for the first time,
6150  * it will be regarded as a normal directory. As the LFSCK processing, some
6151  * other LFSCK instance on other MDT will find the shard of this striped dir,
6152  * and find that the master MDT-object of the striped directory lost its LMV
6153  * EA, then such remote LFSCK instance will regenerate the master LMV EA and
6154  * notify the LFSCK instance on this MDT to rescan the striped directory.
6155  *
6156  * \param[in] env       pointer to the thread context
6157  * \param[in] com       pointer to the lfsck component
6158  * \param[in] llu       the lfsck_lmv_unit that contains the striped directory
6159  *                      to be rescanned.
6160  *
6161  * \retval              positive number for success
6162  * \retval              0 for LFSCK stopped/paused
6163  * \retval              negative error number on failure
6164  */
6165 static int lfsck_namespace_rescan_striped_dir(const struct lu_env *env,
6166                                               struct lfsck_component *com,
6167                                               struct lfsck_lmv_unit *llu)
6168 {
6169         struct lfsck_thread_info        *info   = lfsck_env_info(env);
6170         struct lfsck_instance           *lfsck  = com->lc_lfsck;
6171         struct lfsck_assistant_data     *lad    = com->lc_data;
6172         struct dt_object                *dir;
6173         const struct dt_it_ops          *iops;
6174         struct dt_it                    *di;
6175         struct lu_dirent                *ent    =
6176                         (struct lu_dirent *)info->lti_key;
6177         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
6178         struct ptlrpc_thread            *thread = &lfsck->li_thread;
6179         struct lfsck_assistant_object   *lso    = NULL;
6180         struct lfsck_namespace_req      *lnr;
6181         struct lfsck_assistant_req      *lar;
6182         int                              rc;
6183         __u16                            type;
6184         ENTRY;
6185
6186         LASSERT(list_empty(&lad->lad_req_list));
6187
6188         lfsck->li_lmv = &llu->llu_lmv;
6189         lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
6190         rc = lfsck_open_dir(env, lfsck, 0);
6191         if (rc != 0)
6192                 RETURN(rc);
6193
6194         dir = lfsck->li_obj_dir;
6195         di = lfsck->li_di_dir;
6196         iops = &dir->do_index_ops->dio_it;
6197         do {
6198                 rc = iops->rec(env, di, (struct dt_rec *)ent,
6199                                lfsck->li_args_dir);
6200                 if (rc == 0)
6201                         rc = lfsck_unpack_ent(ent, &lfsck->li_cookie_dir,
6202                                               &type);
6203
6204                 if (rc != 0) {
6205                         if (bk->lb_param & LPF_FAILOUT)
6206                                 GOTO(out, rc);
6207
6208                         goto next;
6209                 }
6210
6211                 if (name_is_dot_or_dotdot(ent->lde_name, ent->lde_namelen))
6212                         goto next;
6213
6214                 if (lso == NULL) {
6215                         lso = lfsck_assistant_object_init(env,
6216                                 lfsck_dto2fid(dir), NULL,
6217                                 lfsck->li_pos_current.lp_oit_cookie, true);
6218                         if (IS_ERR(lso)) {
6219                                 if (bk->lb_param & LPF_FAILOUT)
6220                                         GOTO(out, rc = PTR_ERR(lso));
6221
6222                                 lso = NULL;
6223                                 goto next;
6224                         }
6225                 }
6226
6227                 lnr = lfsck_namespace_assistant_req_init(lfsck, lso, ent, type);
6228                 if (IS_ERR(lnr)) {
6229                         if (bk->lb_param & LPF_FAILOUT)
6230                                 GOTO(out, rc = PTR_ERR(lnr));
6231
6232                         goto next;
6233                 }
6234
6235                 lar = &lnr->lnr_lar;
6236                 rc = lfsck_namespace_assistant_handler_p1(env, com, lar);
6237                 lfsck_namespace_assistant_req_fini(env, lar);
6238                 if (rc != 0 && bk->lb_param & LPF_FAILOUT)
6239                         GOTO(out, rc);
6240
6241                 if (unlikely(!thread_is_running(thread)))
6242                         GOTO(out, rc = 0);
6243
6244 next:
6245                 rc = iops->next(env, di);
6246         } while (rc == 0);
6247
6248 out:
6249         if (lso != NULL && !IS_ERR(lso))
6250                 lfsck_assistant_object_put(env, lso);
6251
6252         lfsck_close_dir(env, lfsck, rc);
6253         if (rc <= 0)
6254                 RETURN(rc);
6255
6256         /* The close_dir() may insert a dummy lnr in the lad->lad_req_list. */
6257         if (list_empty(&lad->lad_req_list))
6258                 RETURN(1);
6259
6260         spin_lock(&lad->lad_lock);
6261         lar = list_entry(lad->lad_req_list.next, struct lfsck_assistant_req,
6262                           lar_list);
6263         list_del_init(&lar->lar_list);
6264         spin_unlock(&lad->lad_lock);
6265
6266         rc = lfsck_namespace_assistant_handler_p1(env, com, lar);
6267         lfsck_namespace_assistant_req_fini(env, lar);
6268
6269         RETURN(rc == 0 ? 1 : rc);
6270 }
6271
6272 static int
6273 lfsck_namespace_double_scan_one_trace_file(const struct lu_env *env,
6274                                            struct lfsck_component *com,
6275                                            struct dt_object *obj, bool first)
6276 {
6277         struct lfsck_instance   *lfsck  = com->lc_lfsck;
6278         struct ptlrpc_thread    *thread = &lfsck->li_thread;
6279         struct lfsck_bookmark   *bk     = &lfsck->li_bookmark_ram;
6280         struct lfsck_namespace  *ns     = com->lc_file_ram;
6281         const struct dt_it_ops  *iops   = &obj->do_index_ops->dio_it;
6282         struct dt_object        *target;
6283         struct dt_it            *di;
6284         struct dt_key           *key;
6285         struct lu_fid            fid;
6286         int                      rc;
6287         __u8                     flags  = 0;
6288         ENTRY;
6289
6290         di = iops->init(env, obj, 0);
6291         if (IS_ERR(di))
6292                 RETURN(PTR_ERR(di));
6293
6294         if (first)
6295                 fid_cpu_to_be(&fid, &ns->ln_fid_latest_scanned_phase2);
6296         else
6297                 fid_zero(&fid);
6298         rc = iops->get(env, di, (const struct dt_key *)&fid);
6299         if (rc < 0)
6300                 GOTO(fini, rc);
6301
6302         if (first) {
6303                 /* The start one either has been processed or does not exist,
6304                  * skip it. */
6305                 rc = iops->next(env, di);
6306                 if (rc != 0)
6307                         GOTO(put, rc);
6308         }
6309
6310         do {
6311                 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY3, cfs_fail_val) &&
6312                     unlikely(!thread_is_running(thread)))
6313                         GOTO(put, rc = 0);
6314
6315                 key = iops->key(env, di);
6316                 if (IS_ERR(key)) {
6317                         rc = PTR_ERR(key);
6318                         if (rc == -ENOENT)
6319                                 GOTO(put, rc = 1);
6320
6321                         goto checkpoint;
6322                 }
6323
6324                 fid_be_to_cpu(&fid, (const struct lu_fid *)key);
6325                 if (!fid_is_sane(&fid)) {
6326                         rc = 0;
6327                         goto checkpoint;
6328                 }
6329
6330                 target = lfsck_object_find_bottom(env, lfsck, &fid);
6331                 if (IS_ERR(target)) {
6332                         rc = PTR_ERR(target);
6333                         goto checkpoint;
6334                 }
6335
6336                 if (dt_object_exists(target)) {
6337                         rc = iops->rec(env, di, (struct dt_rec *)&flags, 0);
6338                         if (rc == 0) {
6339                                 rc = lfsck_namespace_double_scan_one(env, com,
6340                                                                 target, flags);
6341                                 if (rc == -ENOENT)
6342                                         rc = 0;
6343                         }
6344                 }
6345
6346                 lfsck_object_put(env, target);
6347
6348 checkpoint:
6349                 down_write(&com->lc_sem);
6350                 com->lc_new_checked++;
6351                 com->lc_new_scanned++;
6352                 if (rc >= 0)
6353                         ns->ln_fid_latest_scanned_phase2 = fid;
6354
6355                 if (rc > 0)
6356                         ns->ln_objs_repaired_phase2++;
6357                 else if (rc < 0)
6358                         ns->ln_objs_failed_phase2++;
6359                 up_write(&com->lc_sem);
6360
6361                 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
6362                         GOTO(put, rc);
6363
6364                 if (unlikely(com->lc_time_next_checkpoint <=
6365                              ktime_get_seconds()) &&
6366                     com->lc_new_checked != 0) {
6367                         down_write(&com->lc_sem);
6368                         ns->ln_run_time_phase2 += ktime_get_seconds() -
6369                                                   com->lc_time_last_checkpoint;
6370                         ns->ln_time_last_checkpoint = ktime_get_real_seconds();
6371                         ns->ln_objs_checked_phase2 += com->lc_new_checked;
6372                         com->lc_new_checked = 0;
6373                         lfsck_namespace_store(env, com);
6374                         up_write(&com->lc_sem);
6375
6376                         com->lc_time_last_checkpoint = ktime_get_seconds();
6377                         com->lc_time_next_checkpoint =
6378                                 com->lc_time_last_checkpoint +
6379                                 LFSCK_CHECKPOINT_INTERVAL;
6380                 }
6381
6382                 lfsck_control_speed_by_self(com);
6383                 if (unlikely(!thread_is_running(thread)))
6384                         GOTO(put, rc = 0);
6385
6386                 rc = iops->next(env, di);
6387         } while (rc == 0);
6388
6389         GOTO(put, rc);
6390
6391 put:
6392         iops->put(env, di);
6393
6394 fini:
6395         iops->fini(env, di);
6396
6397         return rc;
6398 }
6399
6400 static int lfsck_namespace_assistant_handler_p2(const struct lu_env *env,
6401                                                 struct lfsck_component *com)
6402 {
6403         struct lfsck_instance   *lfsck  = com->lc_lfsck;
6404         struct lfsck_namespace  *ns     = com->lc_file_ram;
6405         int                      rc;
6406         int                      i;
6407         ENTRY;
6408
6409         while (!list_empty(&lfsck->li_list_lmv)) {
6410                 struct lfsck_lmv_unit *llu;
6411
6412                 spin_lock(&lfsck->li_lock);
6413                 llu = list_entry(lfsck->li_list_lmv.next,
6414                                  struct lfsck_lmv_unit, llu_link);
6415                 list_del_init(&llu->llu_link);
6416                 spin_unlock(&lfsck->li_lock);
6417
6418                 rc = lfsck_namespace_rescan_striped_dir(env, com, llu);
6419                 if (rc <= 0)
6420                         RETURN(rc);
6421         }
6422
6423         CDEBUG(D_LFSCK, "%s: namespace LFSCK phase2 scan start\n",
6424                lfsck_lfsck2name(lfsck));
6425
6426         lfsck_namespace_scan_local_lpf(env, com);
6427
6428         com->lc_new_checked = 0;
6429         com->lc_new_scanned = 0;
6430         com->lc_time_last_checkpoint = ktime_get_seconds();
6431         com->lc_time_next_checkpoint = com->lc_time_last_checkpoint +
6432                                        LFSCK_CHECKPOINT_INTERVAL;
6433
6434         i = lfsck_sub_trace_file_fid2idx(&ns->ln_fid_latest_scanned_phase2);
6435         rc = lfsck_namespace_double_scan_one_trace_file(env, com,
6436                                 com->lc_sub_trace_objs[i].lsto_obj, true);
6437         while (rc > 0 && ++i < LFSCK_STF_COUNT)
6438                 rc = lfsck_namespace_double_scan_one_trace_file(env, com,
6439                                 com->lc_sub_trace_objs[i].lsto_obj, false);
6440
6441         CDEBUG(D_LFSCK, "%s: namespace LFSCK phase2 scan stop at the No. %d "
6442                "trace file: rc = %d\n", lfsck_lfsck2name(lfsck), i, rc);
6443
6444         RETURN(rc);
6445 }
6446
6447 static void lfsck_namespace_assistant_fill_pos(const struct lu_env *env,
6448                                                struct lfsck_component *com,
6449                                                struct lfsck_position *pos)
6450 {
6451         struct lfsck_assistant_data     *lad = com->lc_data;
6452         struct lfsck_namespace_req      *lnr;
6453
6454         if (((struct lfsck_namespace *)(com->lc_file_ram))->ln_status !=
6455             LS_SCANNING_PHASE1)
6456                 return;
6457
6458         if (list_empty(&lad->lad_req_list))
6459                 return;
6460
6461         lnr = list_entry(lad->lad_req_list.next,
6462                          struct lfsck_namespace_req,
6463                          lnr_lar.lar_list);
6464         pos->lp_oit_cookie = lnr->lnr_lar.lar_parent->lso_oit_cookie;
6465         pos->lp_dir_cookie = lnr->lnr_dir_cookie - 1;
6466         pos->lp_dir_parent = lnr->lnr_lar.lar_parent->lso_fid;
6467 }
6468
6469 static int lfsck_namespace_double_scan_result(const struct lu_env *env,
6470                                               struct lfsck_component *com,
6471                                               int rc)
6472 {
6473         struct lfsck_instance   *lfsck  = com->lc_lfsck;
6474         struct lfsck_namespace  *ns     = com->lc_file_ram;
6475
6476         down_write(&com->lc_sem);
6477         ns->ln_run_time_phase2 += ktime_get_seconds() -
6478                                   com->lc_time_last_checkpoint;
6479         ns->ln_time_last_checkpoint = ktime_get_real_seconds();
6480         ns->ln_objs_checked_phase2 += com->lc_new_checked;
6481         com->lc_new_checked = 0;
6482
6483         if (rc > 0) {
6484                 if (ns->ln_flags & LF_INCOMPLETE)
6485                         ns->ln_status = LS_PARTIAL;
6486                 else
6487                         ns->ln_status = LS_COMPLETED;
6488                 ns->ln_flags &= ~LF_SCANNED_ONCE;
6489                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN))
6490                         ns->ln_flags &= ~LF_INCONSISTENT;
6491                 ns->ln_time_last_complete = ns->ln_time_last_checkpoint;
6492                 ns->ln_success_count++;
6493         } else if (rc == 0) {
6494                 if (lfsck->li_status != 0)
6495                         ns->ln_status = lfsck->li_status;
6496                 else
6497                         ns->ln_status = LS_STOPPED;
6498         } else {
6499                 ns->ln_status = LS_FAILED;
6500         }
6501
6502         rc = lfsck_namespace_store(env, com);
6503         up_write(&com->lc_sem);
6504
6505         return rc;
6506 }
6507
6508 static int
6509 lfsck_namespace_assistant_sync_failures_interpret(const struct lu_env *env,
6510                                                   struct ptlrpc_request *req,
6511                                                   void *args, int rc)
6512 {
6513         if (rc == 0) {
6514                 struct lfsck_async_interpret_args *laia = args;
6515                 struct lfsck_tgt_desc             *ltd  = laia->laia_ltd;
6516
6517                 ltd->ltd_synced_failures = 1;
6518         }
6519
6520         return 0;
6521 }
6522
6523 /**
6524  * Notify remote LFSCK instances about former failures.
6525  *
6526  * The local LFSCK instance has recorded which MDTs have ever failed to respond
6527  * some LFSCK verification requests (maybe because of network issues or the MDT
6528  * itself trouble). During the respond gap the MDT may missed some name entries
6529  * verification, then the MDT cannot know whether related MDT-objects have been
6530  * referenced by related name entries or not, then in the second-stage scanning,
6531  * these MDT-objects will be regarded as orphan, if the MDT-object contains bad
6532  * linkEA for back reference, then it will misguide the LFSCK to generate wrong
6533  * name entry for repairing the orphan.
6534  *
6535  * To avoid above trouble, when layout LFSCK finishes the first-stage scanning,
6536  * it will scan the bitmap for the ever failed MDTs, and notify them that they
6537  * have ever missed some name entries verification and should skip the handling
6538  * for orphan MDT-objects.
6539  *
6540  * \param[in] env       pointer to the thread context
6541  * \param[in] com       pointer to the lfsck component
6542  * \param[in] lr        pointer to the lfsck request
6543  */
6544 static void lfsck_namespace_assistant_sync_failures(const struct lu_env *env,
6545                                                     struct lfsck_component *com,
6546                                                     struct lfsck_request *lr)
6547 {
6548         struct lfsck_async_interpret_args *laia  =
6549                                 &lfsck_env_info(env)->lti_laia2;
6550         struct lfsck_assistant_data       *lad   = com->lc_data;
6551         struct lfsck_namespace            *ns    = com->lc_file_ram;
6552         struct lfsck_instance             *lfsck = com->lc_lfsck;
6553         struct lfsck_tgt_descs            *ltds  = &lfsck->li_mdt_descs;
6554         struct lfsck_tgt_desc             *ltd;
6555         struct ptlrpc_request_set         *set;
6556         __u32                              idx;
6557         int                                rc    = 0;
6558         ENTRY;
6559
6560         if (!test_bit(LAD_INCOMPLETE, &lad->lad_flags))
6561                 RETURN_EXIT;
6562
6563         set = ptlrpc_prep_set();
6564         if (set == NULL)
6565                 GOTO(out, rc = -ENOMEM);
6566
6567         lr->lr_flags2 = ns->ln_flags | LF_INCOMPLETE;
6568         memset(laia, 0, sizeof(*laia));
6569         lad->lad_touch_gen++;
6570
6571         down_read(&ltds->ltd_rw_sem);
6572         cfs_foreach_bit(lad->lad_bitmap, idx) {
6573                 ltd = lfsck_ltd2tgt(ltds, idx);
6574                 if (unlikely(!ltd))
6575                         continue;
6576
6577                 laia->laia_ltd = ltd;
6578                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
6579                         lfsck_namespace_assistant_sync_failures_interpret,
6580                         laia, LFSCK_NOTIFY);
6581                 if (rc != 0)
6582                         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail "
6583                                "to sync failure with MDT %x: rc = %d\n",
6584                                lfsck_lfsck2name(lfsck), ltd->ltd_index, rc);
6585         }
6586         up_read(&ltds->ltd_rw_sem);
6587
6588         rc = ptlrpc_set_wait(env, set);
6589         ptlrpc_set_destroy(set);
6590
6591         GOTO(out, rc);
6592
6593 out:
6594         if (rc != 0)
6595                 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail "
6596                        "to sync failure with MDTs, and related MDTs "
6597                        "may handle orphan improperly: rc = %d\n",
6598                        lfsck_lfsck2name(lfsck), rc);
6599
6600         EXIT;
6601 }
6602
6603 struct lfsck_assistant_operations lfsck_namespace_assistant_ops = {
6604         .la_handler_p1          = lfsck_namespace_assistant_handler_p1,
6605         .la_handler_p2          = lfsck_namespace_assistant_handler_p2,
6606         .la_fill_pos            = lfsck_namespace_assistant_fill_pos,
6607         .la_double_scan_result  = lfsck_namespace_double_scan_result,
6608         .la_req_fini            = lfsck_namespace_assistant_req_fini,
6609         .la_sync_failures       = lfsck_namespace_assistant_sync_failures,
6610 };
6611
6612 /**
6613  * Verify the specified linkEA entry for the given directory object.
6614  * If the object has no such linkEA entry or it has more other linkEA
6615  * entries, then re-generate the linkEA with the given information.
6616  *
6617  * \param[in] env       pointer to the thread context
6618  * \param[in] obj       pointer to the dt_object to be handled
6619  * \param[in] cname     the name for the child in the parent directory
6620  * \param[in] pfid      the parent directory's FID for the linkEA
6621  *
6622  * \retval              0 for success
6623  * \retval              negative error number on failure
6624  */
6625 int lfsck_verify_linkea(const struct lu_env *env, struct dt_object *obj,
6626                         const struct lu_name *cname, const struct lu_fid *pfid)
6627 {
6628         struct dt_device        *dev    = lfsck_obj2dev(obj);
6629         struct linkea_data       ldata  = { NULL };
6630         struct lu_buf            linkea_buf;
6631         struct thandle          *th;
6632         int                      rc;
6633         int                      fl     = LU_XATTR_CREATE;
6634         bool                     dirty  = false;
6635         ENTRY;
6636
6637         LASSERT(S_ISDIR(lfsck_object_type(obj)));
6638
6639         rc = lfsck_links_read_with_rec(env, obj, &ldata);
6640         if (rc == -ENODATA) {
6641                 dirty = true;
6642         } else if (rc == 0) {
6643                 fl = LU_XATTR_REPLACE;
6644                 if (ldata.ld_leh->leh_reccount != 1) {
6645                         dirty = true;
6646                 } else {
6647                         rc = linkea_links_find(&ldata, cname, pfid);
6648                         if (rc != 0)
6649                                 dirty = true;
6650                 }
6651         }
6652
6653         if (!dirty)
6654                 RETURN(rc);
6655
6656         rc = linkea_links_new(&ldata, &lfsck_env_info(env)->lti_linkea_buf,
6657                               cname, pfid);
6658         if (rc != 0)
6659                 RETURN(rc);
6660
6661         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
6662                        ldata.ld_leh->leh_len);
6663         th = dt_trans_create(env, dev);
6664         if (IS_ERR(th))
6665                 RETURN(PTR_ERR(th));
6666
6667         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
6668                                   XATTR_NAME_LINK, fl, th);
6669         if (rc != 0)
6670                 GOTO(stop, rc);
6671
6672         rc = dt_trans_start_local(env, dev, th);
6673         if (rc != 0)
6674                 GOTO(stop, rc);
6675
6676         dt_write_lock(env, obj, 0);
6677         rc = dt_xattr_set(env, obj, &linkea_buf,
6678                           XATTR_NAME_LINK, fl, th);
6679         dt_write_unlock(env, obj);
6680
6681         GOTO(stop, rc);
6682
6683 stop:
6684         dt_trans_stop(env, dev, th);
6685         return rc;
6686 }
6687
6688 /**
6689  * Get the name and parent directory's FID from the first linkEA entry.
6690  *
6691  * \param[in] env       pointer to the thread context
6692  * \param[in] obj       pointer to the object which get linkEA from
6693  * \param[out] name     pointer to the buffer to hold the name
6694  *                      in the first linkEA entry
6695  * \param[out] pfid     pointer to the buffer to hold the parent
6696  *                      directory's FID in the first linkEA entry
6697  *
6698  * \retval              0 for success
6699  * \retval              negative error number on failure
6700  */
6701 int lfsck_links_get_first(const struct lu_env *env, struct dt_object *obj,
6702                           char *name, struct lu_fid *pfid)
6703 {
6704         struct lu_name           *cname = &lfsck_env_info(env)->lti_name;
6705         struct linkea_data        ldata = { NULL };
6706         int                       rc;
6707
6708         rc = lfsck_links_read_with_rec(env, obj, &ldata);
6709         if (rc)
6710                 return rc;
6711
6712         linkea_first_entry(&ldata);
6713         linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen, cname, pfid);
6714         if (!linkea_entry_is_valid(&ldata, cname, pfid))
6715                 return -EINVAL;
6716
6717         /* To guarantee the 'name' is terminated with '0'. */
6718         memcpy(name, cname->ln_name, cname->ln_namelen);
6719         name[cname->ln_namelen] = 0;
6720
6721         return 0;
6722 }
6723
6724 /**
6725  * Update the object's name entry with the given FID.
6726  *
6727  * \param[in] env       pointer to the thread context
6728  * \param[in] lfsck     pointer to the lfsck instance
6729  * \param[in] dir       pointer to the directory that holds
6730  *                      the name entry
6731  * \param[in] name      the name for the entry to be updated
6732  * \param[in] fid       the new FID for the name entry referenced
6733  * \param[in] type      the type for the name entry to be updated
6734  *
6735  * \retval              0 for success
6736  * \retval              negative error number on failure
6737  */
6738 int lfsck_update_name_entry(const struct lu_env *env,
6739                             struct lfsck_instance *lfsck,
6740                             struct dt_object *dir, const char *name,
6741                             const struct lu_fid *fid, __u32 type)
6742 {
6743         struct lfsck_thread_info *info   = lfsck_env_info(env);
6744         struct dt_insert_rec     *rec    = &info->lti_dt_rec;
6745         struct lfsck_lock_handle *llh    = &info->lti_llh;
6746         struct dt_device         *dev    = lfsck_obj2dev(dir);
6747         struct thandle           *th;
6748         int                       rc;
6749         bool                      exists = true;
6750         ENTRY;
6751
6752         rc = lfsck_lock(env, lfsck, dir, name, llh,
6753                         MDS_INODELOCK_UPDATE, LCK_PW);
6754         if (rc != 0)
6755                 RETURN(rc);
6756
6757         th = dt_trans_create(env, dev);
6758         if (IS_ERR(th))
6759                 GOTO(unlock, rc = PTR_ERR(th));
6760
6761         rc = dt_declare_delete(env, dir, (const struct dt_key *)name, th);
6762         if (rc != 0)
6763                 GOTO(stop, rc);
6764
6765         rec->rec_type = type;
6766         rec->rec_fid = fid;
6767         rc = dt_declare_insert(env, dir, (const struct dt_rec *)rec,
6768                                (const struct dt_key *)name, th);
6769         if (rc != 0)
6770                 GOTO(stop, rc);
6771
6772         rc = dt_declare_ref_add(env, dir, th);
6773         if (rc != 0)
6774                 GOTO(stop, rc);
6775
6776         rc = dt_trans_start_local(env, dev, th);
6777         if (rc != 0)
6778                 GOTO(stop, rc);
6779
6780         rc = dt_delete(env, dir, (const struct dt_key *)name, th);
6781         if (rc == -ENOENT) {
6782                 exists = false;
6783                 rc = 0;
6784         }
6785
6786         if (rc != 0)
6787                 GOTO(stop, rc);
6788
6789         rc = dt_insert(env, dir, (const struct dt_rec *)rec,
6790                        (const struct dt_key *)name, th);
6791         if (rc == 0 && S_ISDIR(type) && !exists) {
6792                 dt_write_lock(env, dir, 0);
6793                 rc = dt_ref_add(env, dir, th);
6794                 dt_write_unlock(env, dir);
6795         }
6796
6797         GOTO(stop, rc);
6798
6799 stop:
6800         dt_trans_stop(env, dev, th);
6801
6802 unlock:
6803         lfsck_unlock(llh);
6804         CDEBUG(D_LFSCK, "%s: update name entry "DFID"/%s with the FID "DFID
6805                " and the type %o: rc = %d\n", lfsck_lfsck2name(lfsck),
6806                PFID(lfsck_dto2fid(dir)), name, PFID(fid), type, rc);
6807
6808         return rc;
6809 }
6810
6811 int lfsck_namespace_setup(const struct lu_env *env,
6812                           struct lfsck_instance *lfsck)
6813 {
6814         struct lfsck_component  *com;
6815         struct lfsck_namespace  *ns;
6816         struct dt_object        *root = NULL;
6817         struct dt_object        *obj;
6818         int                      i;
6819         int                      rc;
6820         ENTRY;
6821
6822         LASSERT(lfsck->li_master);
6823
6824         OBD_ALLOC_PTR(com);
6825         if (com == NULL)
6826                 RETURN(-ENOMEM);
6827
6828         INIT_LIST_HEAD(&com->lc_link);
6829         INIT_LIST_HEAD(&com->lc_link_dir);
6830         init_rwsem(&com->lc_sem);
6831         atomic_set(&com->lc_ref, 1);
6832         com->lc_lfsck = lfsck;
6833         com->lc_type = LFSCK_TYPE_NAMESPACE;
6834         com->lc_ops = &lfsck_namespace_ops;
6835         com->lc_data = lfsck_assistant_data_init(
6836                         &lfsck_namespace_assistant_ops,
6837                         LFSCK_NAMESPACE);
6838         if (com->lc_data == NULL)
6839                 GOTO(out, rc = -ENOMEM);
6840
6841         com->lc_file_size = sizeof(struct lfsck_namespace);
6842         OBD_ALLOC(com->lc_file_ram, com->lc_file_size);
6843         if (com->lc_file_ram == NULL)
6844                 GOTO(out, rc = -ENOMEM);
6845
6846         OBD_ALLOC(com->lc_file_disk, com->lc_file_size);
6847         if (com->lc_file_disk == NULL)
6848                 GOTO(out, rc = -ENOMEM);
6849
6850         for (i = 0; i < LFSCK_STF_COUNT; i++)
6851                 mutex_init(&com->lc_sub_trace_objs[i].lsto_mutex);
6852
6853         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
6854         if (IS_ERR(root))
6855                 GOTO(out, rc = PTR_ERR(root));
6856
6857         if (unlikely(!dt_try_as_dir(env, root)))
6858                 GOTO(out, rc = -ENOTDIR);
6859
6860         obj = local_index_find_or_create(env, lfsck->li_los, root,
6861                                          LFSCK_NAMESPACE,
6862                                          S_IFREG | S_IRUGO | S_IWUSR,
6863                                          &dt_lfsck_namespace_features);
6864         if (IS_ERR(obj))
6865                 GOTO(out, rc = PTR_ERR(obj));
6866
6867         com->lc_obj = obj;
6868         rc = lfsck_namespace_load(env, com);
6869         if (rc == -ENODATA) {
6870                 rc = lfsck_namespace_init(env, com);
6871         } else if (rc < 0) {
6872                 rc = lfsck_namespace_reset(env, com, true);
6873         } else {
6874                 rc = lfsck_load_sub_trace_files(env, com,
6875                         &dt_lfsck_namespace_features, LFSCK_NAMESPACE, false);
6876                 if (rc)
6877                         rc = lfsck_namespace_reset(env, com, true);
6878         }
6879         if (rc != 0)
6880                 GOTO(out, rc);
6881
6882         ns = com->lc_file_ram;
6883         switch (ns->ln_status) {
6884         case LS_INIT:
6885         case LS_COMPLETED:
6886         case LS_FAILED:
6887         case LS_STOPPED:
6888                 spin_lock(&lfsck->li_lock);
6889                 list_add_tail(&com->lc_link, &lfsck->li_list_idle);
6890                 spin_unlock(&lfsck->li_lock);
6891                 break;
6892         default:
6893                 CERROR("%s: unknown lfsck_namespace status %d\n",
6894                        lfsck_lfsck2name(lfsck), ns->ln_status);
6895                 /* fall through */
6896         case LS_SCANNING_PHASE1:
6897         case LS_SCANNING_PHASE2:
6898                 /* No need to store the status to disk right now.
6899                  * If the system crashed before the status stored,
6900                  * it will be loaded back when next time. */
6901                 ns->ln_status = LS_CRASHED;
6902                 /* fall through */
6903         case LS_PAUSED:
6904         case LS_CRASHED:
6905                 spin_lock(&lfsck->li_lock);
6906                 list_add_tail(&com->lc_link, &lfsck->li_list_scan);
6907                 list_add_tail(&com->lc_link_dir, &lfsck->li_list_dir);
6908                 spin_unlock(&lfsck->li_lock);
6909                 break;
6910         }
6911
6912         GOTO(out, rc = 0);
6913
6914 out:
6915         if (root != NULL && !IS_ERR(root))
6916                 lfsck_object_put(env, root);
6917         if (rc != 0) {
6918                 lfsck_component_cleanup(env, com);
6919                 CERROR("%s: fail to init namespace LFSCK component: rc = %d\n",
6920                        lfsck_lfsck2name(lfsck), rc);
6921         }
6922         return rc;
6923 }