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) 2012, 2013, Intel Corporation.
  24  */
  25 /*
  26  * lustre/lfsck/lfsck_namespace.c
  27  *
  28  * Author: Fan, Yong <fan.yong@intel.com>
  29  */
  30
  31 #define DEBUG_SUBSYSTEM S_LFSCK
  32
  33 #include <lustre/lustre_idl.h>
  34 #include <lu_object.h>
  35 #include <dt_object.h>
  36 #include <md_object.h>
  37 #include <lustre_fid.h>
  38 #include <lustre_lib.h>
  39 #include <lustre_net.h>
  40 #include <lustre/lustre_user.h>
  41
  42 #include "lfsck_internal.h"
  43
  44 #define LFSCK_NAMESPACE_MAGIC   0xA0629D03
  45
  46 enum lfsck_nameentry_check {
  47         LFSCK_NAMEENTRY_DEAD            = 1, /* The object has been unlinked. */
  48         LFSCK_NAMEENTRY_REMOVED         = 2, /* The entry has been removed. */
  49         LFSCK_NAMEENTRY_RECREATED       = 3, /* The entry has been recreated. */
  50 };
  51
  52 static const char lfsck_namespace_name[] = "lfsck_namespace";
  53
  54 static struct lfsck_namespace_req *
  55 lfsck_namespace_assistant_req_init(struct lfsck_instance *lfsck,
  56                                    struct lu_dirent *ent, __u16 type)
  57 {
  58         struct lfsck_namespace_req *lnr;
  59         int                         size;
  60
  61         size = sizeof(*lnr) + (ent->lde_namelen & ~3) + 4;
  62         OBD_ALLOC(lnr, size);
  63         if (lnr == NULL)
  64                 return ERR_PTR(-ENOMEM);
  65
  66         INIT_LIST_HEAD(&lnr->lnr_lar.lar_list);
  67         lu_object_get(&lfsck->li_obj_dir->do_lu);
  68         lnr->lnr_obj = lfsck->li_obj_dir;
  69         lnr->lnr_fid = ent->lde_fid;
  70         lnr->lnr_oit_cookie = lfsck->li_pos_current.lp_oit_cookie;
  71         lnr->lnr_dir_cookie = ent->lde_hash;
  72         lnr->lnr_attr = ent->lde_attrs;
  73         lnr->lnr_size = size;
  74         lnr->lnr_type = type;
  75         lnr->lnr_namelen = ent->lde_namelen;
  76         memcpy(lnr->lnr_name, ent->lde_name, ent->lde_namelen);
  77
  78         return lnr;
  79 }
  80
  81 static void lfsck_namespace_assistant_req_fini(const struct lu_env *env,
  82                                                struct lfsck_assistant_req *lar)
  83 {
  84         struct lfsck_namespace_req *lnr =
  85                         container_of0(lar, struct lfsck_namespace_req, lnr_lar);
  86
  87         lu_object_put(env, &lnr->lnr_obj->do_lu);
  88         OBD_FREE(lnr, lnr->lnr_size);
  89 }
  90
  91 static void lfsck_namespace_le_to_cpu(struct lfsck_namespace *dst,
  92                                       struct lfsck_namespace *src)
  93 {
  94         dst->ln_magic = le32_to_cpu(src->ln_magic);
  95         dst->ln_status = le32_to_cpu(src->ln_status);
  96         dst->ln_flags = le32_to_cpu(src->ln_flags);
  97         dst->ln_success_count = le32_to_cpu(src->ln_success_count);
  98         dst->ln_run_time_phase1 = le32_to_cpu(src->ln_run_time_phase1);
  99         dst->ln_run_time_phase2 = le32_to_cpu(src->ln_run_time_phase2);
 100         dst->ln_time_last_complete = le64_to_cpu(src->ln_time_last_complete);
 101         dst->ln_time_latest_start = le64_to_cpu(src->ln_time_latest_start);
 102         dst->ln_time_last_checkpoint =
 103                                 le64_to_cpu(src->ln_time_last_checkpoint);
 104         lfsck_position_le_to_cpu(&dst->ln_pos_latest_start,
 105                                  &src->ln_pos_latest_start);
 106         lfsck_position_le_to_cpu(&dst->ln_pos_last_checkpoint,
 107                                  &src->ln_pos_last_checkpoint);
 108         lfsck_position_le_to_cpu(&dst->ln_pos_first_inconsistent,
 109                                  &src->ln_pos_first_inconsistent);
 110         dst->ln_items_checked = le64_to_cpu(src->ln_items_checked);
 111         dst->ln_items_repaired = le64_to_cpu(src->ln_items_repaired);
 112         dst->ln_items_failed = le64_to_cpu(src->ln_items_failed);
 113         dst->ln_dirs_checked = le64_to_cpu(src->ln_dirs_checked);
 114         dst->ln_objs_checked_phase2 = le64_to_cpu(src->ln_objs_checked_phase2);
 115         dst->ln_objs_repaired_phase2 =
 116                                 le64_to_cpu(src->ln_objs_repaired_phase2);
 117         dst->ln_objs_failed_phase2 = le64_to_cpu(src->ln_objs_failed_phase2);
 118         dst->ln_objs_nlink_repaired = le64_to_cpu(src->ln_objs_nlink_repaired);
 119         fid_le_to_cpu(&dst->ln_fid_latest_scanned_phase2,
 120                       &src->ln_fid_latest_scanned_phase2);
 121         dst->ln_dirent_repaired = le64_to_cpu(src->ln_dirent_repaired);
 122         dst->ln_linkea_repaired = le64_to_cpu(src->ln_linkea_repaired);
 123         dst->ln_mul_linked_checked = le64_to_cpu(src->ln_mul_linked_checked);
 124         dst->ln_mul_linked_repaired = le64_to_cpu(src->ln_mul_linked_repaired);
 125         dst->ln_unknown_inconsistency =
 126                                 le64_to_cpu(src->ln_unknown_inconsistency);
 127         dst->ln_unmatched_pairs_repaired =
 128                                 le64_to_cpu(src->ln_unmatched_pairs_repaired);
 129         dst->ln_dangling_repaired = le64_to_cpu(src->ln_dangling_repaired);
 130         dst->ln_mul_ref_repaired = le64_to_cpu(src->ln_mul_ref_repaired);
 131         dst->ln_bad_type_repaired = le64_to_cpu(src->ln_bad_type_repaired);
 132         dst->ln_lost_dirent_repaired =
 133                                 le64_to_cpu(src->ln_lost_dirent_repaired);
 134 }
 135
 136 static void lfsck_namespace_cpu_to_le(struct lfsck_namespace *dst,
 137                                       struct lfsck_namespace *src)
 138 {
 139         dst->ln_magic = cpu_to_le32(src->ln_magic);
 140         dst->ln_status = cpu_to_le32(src->ln_status);
 141         dst->ln_flags = cpu_to_le32(src->ln_flags);
 142         dst->ln_success_count = cpu_to_le32(src->ln_success_count);
 143         dst->ln_run_time_phase1 = cpu_to_le32(src->ln_run_time_phase1);
 144         dst->ln_run_time_phase2 = cpu_to_le32(src->ln_run_time_phase2);
 145         dst->ln_time_last_complete = cpu_to_le64(src->ln_time_last_complete);
 146         dst->ln_time_latest_start = cpu_to_le64(src->ln_time_latest_start);
 147         dst->ln_time_last_checkpoint =
 148                                 cpu_to_le64(src->ln_time_last_checkpoint);
 149         lfsck_position_cpu_to_le(&dst->ln_pos_latest_start,
 150                                  &src->ln_pos_latest_start);
 151         lfsck_position_cpu_to_le(&dst->ln_pos_last_checkpoint,
 152                                  &src->ln_pos_last_checkpoint);
 153         lfsck_position_cpu_to_le(&dst->ln_pos_first_inconsistent,
 154                                  &src->ln_pos_first_inconsistent);
 155         dst->ln_items_checked = cpu_to_le64(src->ln_items_checked);
 156         dst->ln_items_repaired = cpu_to_le64(src->ln_items_repaired);
 157         dst->ln_items_failed = cpu_to_le64(src->ln_items_failed);
 158         dst->ln_dirs_checked = cpu_to_le64(src->ln_dirs_checked);
 159         dst->ln_objs_checked_phase2 = cpu_to_le64(src->ln_objs_checked_phase2);
 160         dst->ln_objs_repaired_phase2 =
 161                                 cpu_to_le64(src->ln_objs_repaired_phase2);
 162         dst->ln_objs_failed_phase2 = cpu_to_le64(src->ln_objs_failed_phase2);
 163         dst->ln_objs_nlink_repaired = cpu_to_le64(src->ln_objs_nlink_repaired);
 164         fid_cpu_to_le(&dst->ln_fid_latest_scanned_phase2,
 165                       &src->ln_fid_latest_scanned_phase2);
 166         dst->ln_dirent_repaired = cpu_to_le64(src->ln_dirent_repaired);
 167         dst->ln_linkea_repaired = cpu_to_le64(src->ln_linkea_repaired);
 168         dst->ln_mul_linked_checked = cpu_to_le64(src->ln_mul_linked_checked);
 169         dst->ln_mul_linked_repaired = cpu_to_le64(src->ln_mul_linked_repaired);
 170         dst->ln_unknown_inconsistency =
 171                                 cpu_to_le64(src->ln_unknown_inconsistency);
 172         dst->ln_unmatched_pairs_repaired =
 173                                 cpu_to_le64(src->ln_unmatched_pairs_repaired);
 174         dst->ln_dangling_repaired = cpu_to_le64(src->ln_dangling_repaired);
 175         dst->ln_mul_ref_repaired = cpu_to_le64(src->ln_mul_ref_repaired);
 176         dst->ln_bad_type_repaired = cpu_to_le64(src->ln_bad_type_repaired);
 177         dst->ln_lost_dirent_repaired =
 178                                 cpu_to_le64(src->ln_lost_dirent_repaired);
 179 }
 180
 181 static void lfsck_namespace_record_failure(const struct lu_env *env,
 182                                            struct lfsck_instance *lfsck,
 183                                            struct lfsck_namespace *ns)
 184 {
 185         struct lfsck_position pos;
 186
 187         ns->ln_items_failed++;
 188         lfsck_pos_fill(env, lfsck, &pos, false);
 189         if (lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent) ||
 190             lfsck_pos_is_eq(&pos, &ns->ln_pos_first_inconsistent) < 0) {
 191                 ns->ln_pos_first_inconsistent = pos;
 192
 193                 CDEBUG(D_LFSCK, "%s: namespace LFSCK hit first non-repaired "
 194                        "inconsistency at the pos ["LPU64", "DFID", "LPX64"]\n",
 195                        lfsck_lfsck2name(lfsck),
 196                        ns->ln_pos_first_inconsistent.lp_oit_cookie,
 197                        PFID(&ns->ln_pos_first_inconsistent.lp_dir_parent),
 198                        ns->ln_pos_first_inconsistent.lp_dir_cookie);
 199         }
 200 }
 201
 202 /**
 203  * \retval +ve: the lfsck_namespace is broken, the caller should reset it.
 204  * \retval 0: succeed.
 205  * \retval -ve: failed cases.
 206  */
 207 static int lfsck_namespace_load(const struct lu_env *env,
 208                                 struct lfsck_component *com)
 209 {
 210         int len = com->lc_file_size;
 211         int rc;
 212
 213         rc = dt_xattr_get(env, com->lc_obj,
 214                           lfsck_buf_get(env, com->lc_file_disk, len),
 215                           XATTR_NAME_LFSCK_NAMESPACE, BYPASS_CAPA);
 216         if (rc == len) {
 217                 struct lfsck_namespace *ns = com->lc_file_ram;
 218
 219                 lfsck_namespace_le_to_cpu(ns,
 220                                 (struct lfsck_namespace *)com->lc_file_disk);
 221                 if (ns->ln_magic != LFSCK_NAMESPACE_MAGIC) {
 222                         CDEBUG(D_LFSCK, "%s: invalid lfsck_namespace magic "
 223                                "%#x != %#x\n", lfsck_lfsck2name(com->lc_lfsck),
 224                                ns->ln_magic, LFSCK_NAMESPACE_MAGIC);
 225                         rc = 1;
 226                 } else {
 227                         rc = 0;
 228                 }
 229         } else if (rc != -ENODATA) {
 230                 CDEBUG(D_LFSCK, "%s: fail to load lfsck_namespace, "
 231                        "expected = %d: rc = %d\n",
 232                        lfsck_lfsck2name(com->lc_lfsck), len, rc);
 233                 if (rc >= 0)
 234                         rc = 1;
 235         }
 236         return rc;
 237 }
 238
 239 static int lfsck_namespace_store(const struct lu_env *env,
 240                                  struct lfsck_component *com, bool init)
 241 {
 242         struct dt_object        *obj    = com->lc_obj;
 243         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 244         struct thandle          *handle;
 245         int                      len    = com->lc_file_size;
 246         int                      rc;
 247         ENTRY;
 248
 249         lfsck_namespace_cpu_to_le((struct lfsck_namespace *)com->lc_file_disk,
 250                                   (struct lfsck_namespace *)com->lc_file_ram);
 251         handle = dt_trans_create(env, lfsck->li_bottom);
 252         if (IS_ERR(handle))
 253                 GOTO(log, rc = PTR_ERR(handle));
 254
 255         rc = dt_declare_xattr_set(env, obj,
 256                                   lfsck_buf_get(env, com->lc_file_disk, len),
 257                                   XATTR_NAME_LFSCK_NAMESPACE, 0, handle);
 258         if (rc != 0)
 259                 GOTO(out, rc);
 260
 261         rc = dt_trans_start_local(env, lfsck->li_bottom, handle);
 262         if (rc != 0)
 263                 GOTO(out, rc);
 264
 265         rc = dt_xattr_set(env, obj,
 266                           lfsck_buf_get(env, com->lc_file_disk, len),
 267                           XATTR_NAME_LFSCK_NAMESPACE,
 268                           init ? LU_XATTR_CREATE : LU_XATTR_REPLACE,
 269                           handle, BYPASS_CAPA);
 270
 271         GOTO(out, rc);
 272
 273 out:
 274         dt_trans_stop(env, lfsck->li_bottom, handle);
 275
 276 log:
 277         if (rc != 0)
 278                 CDEBUG(D_LFSCK, "%s: fail to store lfsck_namespace: rc = %d\n",
 279                        lfsck_lfsck2name(lfsck), rc);
 280         return rc;
 281 }
 282
 283 static int lfsck_namespace_init(const struct lu_env *env,
 284                                 struct lfsck_component *com)
 285 {
 286         struct lfsck_namespace *ns = com->lc_file_ram;
 287         int rc;
 288
 289         memset(ns, 0, sizeof(*ns));
 290         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
 291         ns->ln_status = LS_INIT;
 292         down_write(&com->lc_sem);
 293         rc = lfsck_namespace_store(env, com, true);
 294         up_write(&com->lc_sem);
 295         return rc;
 296 }
 297
 298 /**
 299  * Update the namespace LFSCK tracing file for the given @fid
 300  *
 301  * \param[in] env       pointer to the thread context
 302  * \param[in] com       pointer to the lfsck component
 303  * \param[in] fid       the fid which flags to be updated in the lfsck
 304  *                      tracing file
 305  * \param[in] add       true if add new flags, otherwise remove flags
 306  *
 307  * \retval              0 for succeed or nothing to be done
 308  * \retval              negative error number on failure
 309  */
 310 int lfsck_namespace_trace_update(const struct lu_env *env,
 311                                  struct lfsck_component *com,
 312                                  const struct lu_fid *fid,
 313                                  const __u8 flags, bool add)
 314 {
 315         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 316         struct dt_object        *obj    = com->lc_obj;
 317         struct lu_fid           *key    = &lfsck_env_info(env)->lti_fid3;
 318         struct dt_device        *dev    = lfsck->li_bottom;
 319         struct thandle          *th     = NULL;
 320         int                      rc     = 0;
 321         __u8                     old    = 0;
 322         __u8                     new    = 0;
 323         ENTRY;
 324
 325         LASSERT(flags != 0);
 326
 327         down_write(&com->lc_sem);
 328         fid_cpu_to_be(key, fid);
 329         rc = dt_lookup(env, obj, (struct dt_rec *)&old,
 330                        (const struct dt_key *)key, BYPASS_CAPA);
 331         if (rc == -ENOENT) {
 332                 if (!add)
 333                         GOTO(unlock, rc = 0);
 334
 335                 old = 0;
 336                 new = flags;
 337         } else if (rc == 0) {
 338                 if (add) {
 339                         if ((old & flags) == flags)
 340                                 GOTO(unlock, rc = 0);
 341
 342                         new = old | flags;
 343                 } else {
 344                         if ((old & flags) == 0)
 345                                 GOTO(unlock, rc = 0);
 346
 347                         new = old & ~flags;
 348                 }
 349         } else {
 350                 GOTO(log, rc);
 351         }
 352
 353         th = dt_trans_create(env, dev);
 354         if (IS_ERR(th))
 355                 GOTO(log, rc = PTR_ERR(th));
 356
 357         if (old != 0) {
 358                 rc = dt_declare_delete(env, obj,
 359                                        (const struct dt_key *)key, th);
 360                 if (rc != 0)
 361                         GOTO(log, rc);
 362         }
 363
 364         if (new != 0) {
 365                 rc = dt_declare_insert(env, obj,
 366                                        (const struct dt_rec *)&new,
 367                                        (const struct dt_key *)key, th);
 368                 if (rc != 0)
 369                         GOTO(log, rc);
 370         }
 371
 372         rc = dt_trans_start_local(env, dev, th);
 373         if (rc != 0)
 374                 GOTO(log, rc);
 375
 376         if (old != 0) {
 377                 rc = dt_delete(env, obj, (const struct dt_key *)key,
 378                                th, BYPASS_CAPA);
 379                 if (rc != 0)
 380                         GOTO(log, rc);
 381         }
 382
 383         if (new != 0) {
 384                 rc = dt_insert(env, obj, (const struct dt_rec *)&new,
 385                                (const struct dt_key *)key, th, BYPASS_CAPA, 1);
 386                 if (rc != 0)
 387                         GOTO(log, rc);
 388         }
 389
 390         GOTO(log, rc);
 391
 392 log:
 393         if (th != NULL && !IS_ERR(th))
 394                 dt_trans_stop(env, dev, th);
 395
 396         CDEBUG(D_LFSCK, "%s: namespace LFSCK %s flags for "DFID" in the "
 397                "tracing file, flags %x, old %x, new %x: rc = %d\n",
 398                lfsck_lfsck2name(lfsck), add ? "add" : "del", PFID(fid),
 399                (__u32)flags, (__u32)old, (__u32)new, rc);
 400
 401 unlock:
 402         up_write(&com->lc_sem);
 403
 404         return rc;
 405 }
 406
 407 static int lfsck_namespace_check_exist(const struct lu_env *env,
 408                                        struct dt_object *dir,
 409                                        struct dt_object *obj, const char *name)
 410 {
 411         struct lu_fid    *fid = &lfsck_env_info(env)->lti_fid;
 412         int               rc;
 413         ENTRY;
 414
 415         if (unlikely(lfsck_is_dead_obj(obj)))
 416                 RETURN(LFSCK_NAMEENTRY_DEAD);
 417
 418         rc = dt_lookup(env, dir, (struct dt_rec *)fid,
 419                        (const struct dt_key *)name, BYPASS_CAPA);
 420         if (rc == -ENOENT)
 421                 RETURN(LFSCK_NAMEENTRY_REMOVED);
 422
 423         if (rc < 0)
 424                 RETURN(rc);
 425
 426         if (!lu_fid_eq(fid, lfsck_dto2fid(obj)))
 427                 RETURN(LFSCK_NAMEENTRY_RECREATED);
 428
 429         RETURN(0);
 430 }
 431
 432 static int lfsck_declare_namespace_exec_dir(const struct lu_env *env,
 433                                             struct dt_object *obj,
 434                                             struct thandle *handle)
 435 {
 436         int rc;
 437
 438         /* For destroying all invalid linkEA entries. */
 439         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, handle);
 440         if (rc != 0)
 441                 return rc;
 442
 443         /* For insert new linkEA entry. */
 444         rc = dt_declare_xattr_set(env, obj,
 445                         lfsck_buf_get_const(env, NULL, DEFAULT_LINKEA_SIZE),
 446                         XATTR_NAME_LINK, 0, handle);
 447         return rc;
 448 }
 449
 450 int __lfsck_links_read(const struct lu_env *env, struct dt_object *obj,
 451                        struct linkea_data *ldata)
 452 {
 453         int rc;
 454
 455         if (ldata->ld_buf->lb_buf == NULL)
 456                 return -ENOMEM;
 457
 458         if (!dt_object_exists(obj))
 459                 return -ENOENT;
 460
 461         rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK, BYPASS_CAPA);
 462         if (rc == -ERANGE) {
 463                 /* Buf was too small, figure out what we need. */
 464                 rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LINK,
 465                                   BYPASS_CAPA);
 466                 if (rc <= 0)
 467                         return rc;
 468
 469                 lu_buf_realloc(ldata->ld_buf, rc);
 470                 if (ldata->ld_buf->lb_buf == NULL)
 471                         return -ENOMEM;
 472
 473                 rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK,
 474                                   BYPASS_CAPA);
 475         }
 476
 477         if (rc > 0)
 478                 rc = linkea_init(ldata);
 479
 480         return rc;
 481 }
 482
 483 /**
 484  * Remove linkEA for the given object.
 485  *
 486  * The caller should take the ldlm lock before the calling.
 487  *
 488  * \param[in] env       pointer to the thread context
 489  * \param[in] com       pointer to the lfsck component
 490  * \param[in] obj       pointer to the dt_object to be handled
 491  *
 492  * \retval              0 for repaired cases
 493  * \retval              negative error number on failure
 494  */
 495 static int lfsck_namespace_links_remove(const struct lu_env *env,
 496                                         struct lfsck_component *com,
 497                                         struct dt_object *obj)
 498 {
 499         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 500         struct dt_device                *dev    = lfsck->li_bottom;
 501         struct thandle                  *th     = NULL;
 502         int                              rc     = 0;
 503         ENTRY;
 504
 505         LASSERT(dt_object_remote(obj) == 0);
 506
 507         th = dt_trans_create(env, dev);
 508         if (IS_ERR(th))
 509                 GOTO(log, rc = PTR_ERR(th));
 510
 511         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, th);
 512         if (rc != 0)
 513                 GOTO(stop, rc);
 514
 515         rc = dt_trans_start_local(env, dev, th);
 516         if (rc != 0)
 517                 GOTO(stop, rc);
 518
 519         dt_write_lock(env, obj, 0);
 520         if (unlikely(lfsck_is_dead_obj(obj)))
 521                 GOTO(unlock, rc = -ENOENT);
 522
 523         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
 524                 GOTO(unlock, rc = 0);
 525
 526         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, th, BYPASS_CAPA);
 527
 528         GOTO(unlock, rc);
 529
 530 unlock:
 531         dt_write_unlock(env, obj);
 532
 533 stop:
 534         dt_trans_stop(env, dev, th);
 535
 536 log:
 537         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove invalid linkEA "
 538                "for the object "DFID": rc = %d\n",
 539                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
 540
 541         if (rc == 0) {
 542                 struct lfsck_namespace *ns = com->lc_file_ram;
 543
 544                 ns->ln_flags |= LF_INCONSISTENT;
 545         }
 546
 547         return rc;
 548 }
 549
 550 static int lfsck_links_write(const struct lu_env *env, struct dt_object *obj,
 551                              struct linkea_data *ldata, struct thandle *handle)
 552 {
 553         const struct lu_buf *buf = lfsck_buf_get_const(env,
 554                                                        ldata->ld_buf->lb_buf,
 555                                                        ldata->ld_leh->leh_len);
 556
 557         return dt_xattr_set(env, obj, buf, XATTR_NAME_LINK, 0, handle,
 558                             BYPASS_CAPA);
 559 }
 560
 561 static void lfsck_namespace_unpack_linkea_entry(struct linkea_data *ldata,
 562                                                 struct lu_name *cname,
 563                                                 struct lu_fid *pfid,
 564                                                 char *buf)
 565 {
 566         linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, cname, pfid);
 567         /* To guarantee the 'name' is terminated with '0'. */
 568         memcpy(buf, cname->ln_name, cname->ln_namelen);
 569         buf[cname->ln_namelen] = 0;
 570         cname->ln_name = buf;
 571 }
 572
 573 static int lfsck_namespace_filter_linkea_entry(struct linkea_data *ldata,
 574                                                struct lu_name *cname,
 575                                                struct lu_fid *pfid,
 576                                                bool remove)
 577 {
 578         struct link_ea_entry    *oldlee;
 579         int                      oldlen;
 580         int                      repeated = 0;
 581
 582         oldlee = ldata->ld_lee;
 583         oldlen = ldata->ld_reclen;
 584         linkea_next_entry(ldata);
 585         while (ldata->ld_lee != NULL) {
 586                 ldata->ld_reclen = (ldata->ld_lee->lee_reclen[0] << 8) |
 587                                    ldata->ld_lee->lee_reclen[1];
 588                 if (unlikely(ldata->ld_reclen == oldlen &&
 589                              memcmp(ldata->ld_lee, oldlee, oldlen) == 0)) {
 590                         repeated++;
 591                         if (!remove)
 592                                 break;
 593
 594                         linkea_del_buf(ldata, cname);
 595                 } else {
 596                         linkea_next_entry(ldata);
 597                 }
 598         }
 599         ldata->ld_lee = oldlee;
 600         ldata->ld_reclen = oldlen;
 601
 602         return repeated;
 603 }
 604
 605 /**
 606  * Insert orphan into .lustre/lost+found/MDTxxxx/ locally.
 607  *
 608  * Add the specified orphan MDT-object to the .lustre/lost+found/MDTxxxx/
 609  * with the given type to generate the name, the detailed rules for name
 610  * have been described as following.
 611  *
 612  * The function also generates the linkEA corresponding to the name entry
 613  * under the .lustre/lost+found/MDTxxxx/ for the orphan MDT-object.
 614  *
 615  * \param[in] env       pointer to the thread context
 616  * \param[in] com       pointer to the lfsck component
 617  * \param[in] orphan    pointer to the orphan MDT-object
 618  * \param[in] infix     additional information for the orphan name, such as
 619  *                      the FID for original
 620  * \param[in] type      the type for describing why the orphan MDT-object is
 621  *                      created. The rules are as following:
 622  *
 623  *  type "D":           The MDT-object is a directory, it may knows its parent
 624  *                      but because there is no valid linkEA, the LFSCK cannot
 625  *                      know where to put it back to the namespace.
 626  *  type "O":           The MDT-object has no linkEA, and there is no name
 627  *                      entry that references the MDT-object.
 628  *
 629  * \see lfsck_layout_recreate_parent() for more types.
 630  *
 631  * The orphan name will be like:
 632  * ${FID}-${infix}-${type}-${conflict_version}
 633  *
 634  * \param[out] count    if some others inserted some linkEA entries by race,
 635  *                      then return the linkEA entries count.
 636  *
 637  * \retval              positive number for repaired cases
 638  * \retval              0 if needs to repair nothing
 639  * \retval              negative error number on failure
 640  */
 641 static int lfsck_namespace_insert_orphan(const struct lu_env *env,
 642                                          struct lfsck_component *com,
 643                                          struct dt_object *orphan,
 644                                          const char *infix, const char *type,
 645                                          int *count)
 646 {
 647         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 648         struct lu_name                  *cname  = &info->lti_name;
 649         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
 650         struct lu_fid                   *tfid   = &info->lti_fid5;
 651         const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
 652         const struct lu_fid             *pfid;
 653         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 654         struct dt_device                *dev    = lfsck->li_bottom;
 655         struct dt_object                *parent;
 656         struct thandle                  *th     = NULL;
 657         struct lustre_handle             plh    = { 0 };
 658         struct lustre_handle             clh    = { 0 };
 659         struct linkea_data               ldata  = { 0 };
 660         struct lu_buf                    linkea_buf;
 661         int                              namelen;
 662         int                              idx    = 0;
 663         int                              rc     = 0;
 664         bool                             exist  = false;
 665         ENTRY;
 666
 667         cname->ln_name = NULL;
 668         /* Create .lustre/lost+found/MDTxxxx when needed. */
 669         if (unlikely(lfsck->li_lpf_obj == NULL)) {
 670                 rc = lfsck_create_lpf(env, lfsck);
 671                 if (rc != 0)
 672                         GOTO(log, rc);
 673         }
 674
 675         parent = lfsck->li_lpf_obj;
 676         pfid = lfsck_dto2fid(parent);
 677
 678         /* Hold update lock on the parent to prevent others to access. */
 679         rc = lfsck_ibits_lock(env, lfsck, parent, &plh,
 680                               MDS_INODELOCK_UPDATE, LCK_EX);
 681         if (rc != 0)
 682                 GOTO(log, rc);
 683
 684         do {
 685                 namelen = snprintf(info->lti_key, NAME_MAX, DFID"%s-%s-%d",
 686                                    PFID(cfid), infix, type, idx++);
 687                 rc = dt_lookup(env, parent, (struct dt_rec *)tfid,
 688                                (const struct dt_key *)info->lti_key,
 689                                BYPASS_CAPA);
 690                 if (rc != 0 && rc != -ENOENT)
 691                         GOTO(log, rc);
 692
 693                 if (unlikely(rc == 0 && lu_fid_eq(cfid, tfid)))
 694                         exist = true;
 695         } while (rc == 0 && !exist);
 696
 697         cname->ln_name = info->lti_key;
 698         cname->ln_namelen = namelen;
 699         rc = linkea_data_new(&ldata, &info->lti_linkea_buf2);
 700         if (rc != 0)
 701                 GOTO(log, rc);
 702
 703         rc = linkea_add_buf(&ldata, cname, pfid);
 704         if (rc != 0)
 705                 GOTO(log, rc);
 706
 707         rc = lfsck_ibits_lock(env, lfsck, orphan, &clh,
 708                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_LOOKUP,
 709                               LCK_EX);
 710         if (rc != 0)
 711                 GOTO(log, rc);
 712
 713         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
 714                        ldata.ld_leh->leh_len);
 715         th = dt_trans_create(env, dev);
 716         if (IS_ERR(th))
 717                 GOTO(log, rc = PTR_ERR(th));
 718
 719         if (S_ISDIR(lfsck_object_type(orphan))) {
 720                 rc = dt_declare_delete(env, orphan,
 721                                        (const struct dt_key *)dotdot, th);
 722                 if (rc != 0)
 723                         GOTO(stop, rc);
 724
 725                 rec->rec_type = S_IFDIR;
 726                 rec->rec_fid = pfid;
 727                 rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
 728                                        (const struct dt_key *)dotdot, th);
 729                 if (rc != 0)
 730                         GOTO(stop, rc);
 731         }
 732
 733         rc = dt_declare_xattr_set(env, orphan, &linkea_buf,
 734                                   XATTR_NAME_LINK, 0, th);
 735         if (rc != 0)
 736                 GOTO(stop, rc);
 737
 738         if (!exist) {
 739                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
 740                 rec->rec_fid = cfid;
 741                 rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
 742                                        (const struct dt_key *)cname->ln_name,
 743                                        th);
 744                 if (rc != 0)
 745                         GOTO(stop, rc);
 746
 747                 if (S_ISDIR(rec->rec_type)) {
 748                         rc = dt_declare_ref_add(env, parent, th);
 749                         if (rc != 0)
 750                                 GOTO(stop, rc);
 751                 }
 752         }
 753
 754         rc = dt_trans_start_local(env, dev, th);
 755         if (rc != 0)
 756                 GOTO(stop, rc);
 757
 758         dt_write_lock(env, orphan, 0);
 759         rc = lfsck_links_read(env, orphan, &ldata);
 760         if (likely((rc == -ENODATA) || (rc == -EINVAL) ||
 761                    (rc == 0 && ldata.ld_leh->leh_reccount == 0))) {
 762                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
 763                         GOTO(unlock, rc = 1);
 764
 765                 if (S_ISDIR(lfsck_object_type(orphan))) {
 766                         rc = dt_delete(env, orphan,
 767                                        (const struct dt_key *)dotdot, th,
 768                                        BYPASS_CAPA);
 769                         if (rc != 0)
 770                                 GOTO(unlock, rc);
 771
 772                         rec->rec_type = S_IFDIR;
 773                         rec->rec_fid = pfid;
 774                         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
 775                                        (const struct dt_key *)dotdot, th,
 776                                        BYPASS_CAPA, 1);
 777                         if (rc != 0)
 778                                 GOTO(unlock, rc);
 779                 }
 780
 781                 rc = dt_xattr_set(env, orphan, &linkea_buf, XATTR_NAME_LINK, 0,
 782                                   th, BYPASS_CAPA);
 783         } else {
 784                 if (rc == 0 && count != NULL)
 785                         *count = ldata.ld_leh->leh_reccount;
 786
 787                 GOTO(unlock, rc);
 788         }
 789         dt_write_unlock(env, orphan);
 790
 791         if (rc == 0 && !exist) {
 792                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
 793                 rec->rec_fid = cfid;
 794                 rc = dt_insert(env, parent, (const struct dt_rec *)rec,
 795                                (const struct dt_key *)cname->ln_name,
 796                                th, BYPASS_CAPA, 1);
 797                 if (rc == 0 && S_ISDIR(rec->rec_type)) {
 798                         dt_write_lock(env, parent, 0);
 799                         rc = dt_ref_add(env, parent, th);
 800                         dt_write_unlock(env, parent);
 801                 }
 802         }
 803
 804         GOTO(stop, rc = (rc == 0 ? 1 : rc));
 805
 806 unlock:
 807         dt_write_unlock(env, orphan);
 808
 809 stop:
 810         dt_trans_stop(env, dev, th);
 811
 812 log:
 813         lfsck_ibits_unlock(&clh, LCK_EX);
 814         lfsck_ibits_unlock(&plh, LCK_EX);
 815         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert orphan for the "
 816                "object "DFID", name = %s: rc = %d\n",
 817                lfsck_lfsck2name(lfsck), PFID(cfid),
 818                cname->ln_name != NULL ? cname->ln_name : "<NULL>", rc);
 819
 820         if (rc != 0) {
 821                 struct lfsck_namespace *ns = com->lc_file_ram;
 822
 823                 ns->ln_flags |= LF_INCONSISTENT;
 824         }
 825
 826         return rc;
 827 }
 828
 829 /**
 830  * Add the specified name entry back to namespace.
 831  *
 832  * If there is a linkEA entry that back references a name entry under
 833  * some parent directory, but such parent directory does not have the
 834  * claimed name entry. On the other hand, the linkEA entries count is
 835  * not larger than the MDT-object's hard link count. Under such case,
 836  * it is quite possible that the name entry is lost. Then the LFSCK
 837  * should add the name entry back to the namespace.
 838  *
 839  * \param[in] env       pointer to the thread context
 840  * \param[in] com       pointer to the lfsck component
 841  * \param[in] parent    pointer to the directory under which the name entry
 842  *                      will be inserted into
 843  * \param[in] child     pointer to the object referenced by the name entry
 844  *                      that to be inserted into the parent
 845  * \param[in] name      the name for the child in the parent directory
 846  *
 847  * \retval              positive number for repaired cases
 848  * \retval              0 if nothing to be repaired
 849  * \retval              negative error number on failure
 850  */
 851 static int lfsck_namespace_insert_normal(const struct lu_env *env,
 852                                          struct lfsck_component *com,
 853                                          struct dt_object *parent,
 854                                          struct dt_object *child,
 855                                          const char *name)
 856 {
 857         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 858         struct lu_attr                  *la     = &info->lti_la;
 859         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
 860         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 861         struct dt_device                *dev    = lfsck->li_next;
 862         struct thandle                  *th     = NULL;
 863         struct lustre_handle             lh     = { 0 };
 864         int                              rc     = 0;
 865         ENTRY;
 866
 867         if (unlikely(!dt_try_as_dir(env, parent)))
 868                 GOTO(log, rc = -ENOTDIR);
 869
 870         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
 871                 GOTO(log, rc = 1);
 872
 873         /* Hold update lock on the parent to prevent others to access. */
 874         rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
 875                               MDS_INODELOCK_UPDATE, LCK_EX);
 876         if (rc != 0)
 877                 GOTO(log, rc);
 878
 879         th = dt_trans_create(env, dev);
 880         if (IS_ERR(th))
 881                 GOTO(unlock, rc = PTR_ERR(th));
 882
 883         rec->rec_type = lfsck_object_type(child) & S_IFMT;
 884         rec->rec_fid = lfsck_dto2fid(child);
 885         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
 886                                (const struct dt_key *)name, th);
 887         if (rc != 0)
 888                 GOTO(stop, rc);
 889
 890         if (S_ISDIR(rec->rec_type)) {
 891                 rc = dt_declare_ref_add(env, parent, th);
 892                 if (rc != 0)
 893                         GOTO(stop, rc);
 894         }
 895
 896         memset(la, 0, sizeof(*la));
 897         la->la_ctime = cfs_time_current_sec();
 898         la->la_valid = LA_CTIME;
 899         rc = dt_declare_attr_set(env, parent, la, th);
 900         if (rc != 0)
 901                 GOTO(stop, rc);
 902
 903         rc = dt_trans_start_local(env, dev, th);
 904         if (rc != 0)
 905                 GOTO(stop, rc);
 906
 907         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
 908                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
 909         if (rc != 0)
 910                 GOTO(stop, rc);
 911
 912         if (S_ISDIR(rec->rec_type)) {
 913                 dt_write_lock(env, parent, 0);
 914                 rc = dt_ref_add(env, parent, th);
 915                 dt_write_unlock(env, parent);
 916                 if (rc != 0)
 917                         GOTO(stop, rc);
 918         }
 919
 920         la->la_ctime = cfs_time_current_sec();
 921         rc = dt_attr_set(env, parent, la, th, BYPASS_CAPA);
 922
 923         GOTO(stop, rc = (rc == 0 ? 1 : rc));
 924
 925 stop:
 926         dt_trans_stop(env, dev, th);
 927
 928 unlock:
 929         lfsck_ibits_unlock(&lh, LCK_EX);
 930
 931 log:
 932         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert object "DFID" with "
 933                "the name %s and type %o to the parent "DFID": rc = %d\n",
 934                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(child)), name,
 935                lfsck_object_type(child) & S_IFMT,
 936                PFID(lfsck_dto2fid(parent)), rc);
 937
 938         if (rc != 0) {
 939                 struct lfsck_namespace *ns = com->lc_file_ram;
 940
 941                 ns->ln_flags |= LF_INCONSISTENT;
 942                 if (rc > 0)
 943                         ns->ln_lost_dirent_repaired++;
 944         }
 945
 946         return rc;
 947 }
 948
 949 static int lfsck_namespace_create_orphan(const struct lu_env *env,
 950                                          struct lfsck_component *com,
 951                                          struct dt_object *orphan)
 952 {
 953         /* XXX: TBD */
 954         return 0;
 955 }
 956
 957 /**
 958  * Remove the specified entry from the linkEA.
 959  *
 960  * Locate the linkEA entry with the given @cname and @pfid, then
 961  * remove this entry or the other entries those are repeated with
 962  * this entry.
 963  *
 964  * \param[in] env       pointer to the thread context
 965  * \param[in] com       pointer to the lfsck component
 966  * \param[in] obj       pointer to the dt_object to be handled
 967  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
 968  * \param[in] cname     the name for the child in the parent directory
 969  * \param[in] pfid      the parent directory's FID for the linkEA
 970  * \param[in] next      if true, then remove the first found linkEA
 971  *                      entry, and move the ldata->ld_lee to next entry
 972  *
 973  * \retval              positive number for repaired cases
 974  * \retval              0 if nothing to be repaired
 975  * \retval              negative error number on failure
 976  */
 977 static int lfsck_namespace_shrink_linkea(const struct lu_env *env,
 978                                          struct lfsck_component *com,
 979                                          struct dt_object *obj,
 980                                          struct linkea_data *ldata,
 981                                          struct lu_name *cname,
 982                                          struct lu_fid *pfid,
 983                                          bool next)
 984 {
 985         struct lfsck_instance           *lfsck     = com->lc_lfsck;
 986         struct dt_device                *dev       = lfsck->li_bottom;
 987         struct lfsck_bookmark           *bk        = &lfsck->li_bookmark_ram;
 988         struct thandle                  *th        = NULL;
 989         struct lustre_handle             lh        = { 0 };
 990         struct linkea_data               ldata_new = { 0 };
 991         struct lu_buf                    linkea_buf;
 992         int                              rc        = 0;
 993         ENTRY;
 994
 995         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
 996                               MDS_INODELOCK_UPDATE |
 997                               MDS_INODELOCK_XATTR, LCK_EX);
 998         if (rc != 0)
 999                 GOTO(log, rc);
1000
1001         if (next)
1002                 linkea_del_buf(ldata, cname);
1003         else
1004                 lfsck_namespace_filter_linkea_entry(ldata, cname, pfid,
1005                                                     true);
1006         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
1007                        ldata->ld_leh->leh_len);
1008
1009 again:
1010         th = dt_trans_create(env, dev);
1011         if (IS_ERR(th))
1012                 GOTO(unlock1, rc = PTR_ERR(th));
1013
1014         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1015                                   XATTR_NAME_LINK, 0, th);
1016         if (rc != 0)
1017                 GOTO(stop, rc);
1018
1019         rc = dt_trans_start_local(env, dev, th);
1020         if (rc != 0)
1021                 GOTO(stop, rc);
1022
1023         dt_write_lock(env, obj, 0);
1024         if (unlikely(lfsck_is_dead_obj(obj)))
1025                 GOTO(unlock2, rc = -ENOENT);
1026
1027         rc = lfsck_links_read2(env, obj, &ldata_new);
1028         if (rc != 0)
1029                 GOTO(unlock2, rc);
1030
1031         /* The specified linkEA entry has been removed by race. */
1032         rc = linkea_links_find(&ldata_new, cname, pfid);
1033         if (rc != 0)
1034                 GOTO(unlock2, rc = 0);
1035
1036         if (bk->lb_param & LPF_DRYRUN)
1037                 GOTO(unlock2, rc = 1);
1038
1039         if (next)
1040                 linkea_del_buf(&ldata_new, cname);
1041         else
1042                 lfsck_namespace_filter_linkea_entry(&ldata_new, cname, pfid,
1043                                                     true);
1044
1045         if (linkea_buf.lb_len < ldata_new.ld_leh->leh_len) {
1046                 dt_write_unlock(env, obj);
1047                 dt_trans_stop(env, dev, th);
1048                 lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
1049                                ldata_new.ld_leh->leh_len);
1050                 goto again;
1051         }
1052
1053         lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
1054                        ldata_new.ld_leh->leh_len);
1055         rc = dt_xattr_set(env, obj, &linkea_buf,
1056                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
1057
1058         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
1059
1060 unlock2:
1061         dt_write_unlock(env, obj);
1062
1063 stop:
1064         dt_trans_stop(env, dev, th);
1065
1066 unlock1:
1067         lfsck_ibits_unlock(&lh, LCK_EX);
1068
1069 log:
1070         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove %s linkEA entry "
1071                "for the object: "DFID", parent "DFID", name %.*s\n",
1072                lfsck_lfsck2name(lfsck), next ? "invalid" : "redundant",
1073                PFID(lfsck_dto2fid(obj)), PFID(pfid), cname->ln_namelen,
1074                cname->ln_name);
1075
1076         if (rc != 0) {
1077                 struct lfsck_namespace *ns = com->lc_file_ram;
1078
1079                 ns->ln_flags |= LF_INCONSISTENT;
1080         }
1081
1082         return rc;
1083 }
1084
1085 /**
1086  * Conditionally remove the specified entry from the linkEA.
1087  *
1088  * Take the parent lock firstly, then check whether the specified
1089  * name entry exists or not: if yes, do nothing; otherwise, call
1090  * lfsck_namespace_shrink_linkea() to remove the linkea entry.
1091  *
1092  * \param[in] env       pointer to the thread context
1093  * \param[in] com       pointer to the lfsck component
1094  * \param[in] parent    pointer to the parent directory
1095  * \param[in] child     pointer to the child object that holds the linkEA
1096  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
1097  * \param[in] cname     the name for the child in the parent directory
1098  * \param[in] pfid      the parent directory's FID for the linkEA
1099  *
1100  * \retval              positive number for repaired cases
1101  * \retval              0 if nothing to be repaired
1102  * \retval              negative error number on failure
1103  */
1104 static int lfsck_namespace_shrink_linkea_cond(const struct lu_env *env,
1105                                               struct lfsck_component *com,
1106                                               struct dt_object *parent,
1107                                               struct dt_object *child,
1108                                               struct linkea_data *ldata,
1109                                               struct lu_name *cname,
1110                                               struct lu_fid *pfid)
1111 {
1112         struct lu_fid           *cfid   = &lfsck_env_info(env)->lti_fid3;
1113         struct lustre_handle     lh     = { 0 };
1114         int                      rc;
1115         ENTRY;
1116
1117         rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
1118                               MDS_INODELOCK_UPDATE, LCK_EX);
1119         if (rc != 0)
1120                 RETURN(rc);
1121
1122         dt_read_lock(env, parent, 0);
1123         if (unlikely(lfsck_is_dead_obj(parent))) {
1124                 dt_read_unlock(env, parent);
1125                 lfsck_ibits_unlock(&lh, LCK_EX);
1126                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1127                                                    cname, pfid, true);
1128
1129                 RETURN(rc);
1130         }
1131
1132         rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
1133                        (const struct dt_key *)cname->ln_name,
1134                        BYPASS_CAPA);
1135         dt_read_unlock(env, parent);
1136
1137         /* It is safe to release the ldlm lock, because when the logic come
1138          * here, we have got all the needed information above whether the
1139          * linkEA entry is valid or not. It is not important that others
1140          * may add new linkEA entry after the ldlm lock released. If other
1141          * has removed the specified linkEA entry by race, then it is OK,
1142          * because the subsequent lfsck_namespace_shrink_linkea() can handle
1143          * such case. */
1144         lfsck_ibits_unlock(&lh, LCK_EX);
1145         if (rc == -ENOENT) {
1146                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1147                                                    cname, pfid, true);
1148
1149                 RETURN(rc);
1150         }
1151
1152         if (rc != 0)
1153                 RETURN(rc);
1154
1155         /* The LFSCK just found some internal status of cross-MDTs
1156          * create operation. That is normal. */
1157         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
1158                 linkea_next_entry(ldata);
1159
1160                 RETURN(0);
1161         }
1162
1163         rc = lfsck_namespace_shrink_linkea(env, com, child, ldata, cname,
1164                                            pfid, true);
1165
1166         RETURN(rc);
1167 }
1168
1169 /**
1170  * Conditionally replace name entry in the parent.
1171  *
1172  * As required, the LFSCK may re-create the lost MDT-object for dangling
1173  * name entry, but such repairing may be wrong because of bad FID in the
1174  * name entry. As the LFSCK processing, the real MDT-object may be found,
1175  * then the LFSCK should check whether the former re-created MDT-object
1176  * has been modified or not, if not, then destroy it and update the name
1177  * entry in the parent to reference the real MDT-object.
1178  *
1179  * \param[in] env       pointer to the thread context
1180  * \param[in] com       pointer to the lfsck component
1181  * \param[in] parent    pointer to the parent directory
1182  * \param[in] child     pointer to the MDT-object that may be the real
1183  *                      MDT-object corresponding to the name entry in parent
1184  * \param[in] cfid      the current FID in the name entry
1185  * \param[in] cname     contains the name of the child in the parent directory
1186  *
1187  * \retval              positive number for repaired cases
1188  * \retval              0 if nothing to be repaired
1189  * \retval              negative error number on failure
1190  */
1191 static int lfsck_namespace_replace_cond(const struct lu_env *env,
1192                                         struct lfsck_component *com,
1193                                         struct dt_object *parent,
1194                                         struct dt_object *child,
1195                                         const struct lu_fid *cfid,
1196                                         const struct lu_name *cname)
1197 {
1198         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1199         struct lu_fid                   *tfid   = &info->lti_fid5;
1200         struct lu_attr                  *la     = &info->lti_la;
1201         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1202         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1203         struct dt_device                *dev    = lfsck->li_next;
1204         const char                      *name   = cname->ln_name;
1205         struct dt_object                *obj    = NULL;
1206         struct lustre_handle             plh    = { 0 };
1207         struct lustre_handle             clh    = { 0 };
1208         struct linkea_data               ldata  = { 0 };
1209         struct thandle                  *th     = NULL;
1210         bool                             exist  = true;
1211         int                              rc     = 0;
1212         ENTRY;
1213
1214         rc = lfsck_ibits_lock(env, lfsck, parent, &plh,
1215                               MDS_INODELOCK_UPDATE, LCK_EX);
1216         if (rc != 0)
1217                 GOTO(log, rc);
1218
1219         if (!fid_is_sane(cfid)) {
1220                 exist = false;
1221                 goto replace;
1222         }
1223
1224         obj = lfsck_object_find(env, lfsck, cfid);
1225         if (IS_ERR(obj)) {
1226                 rc = PTR_ERR(obj);
1227                 if (rc == -ENOENT) {
1228                         exist = false;
1229                         goto replace;
1230                 }
1231
1232                 GOTO(log, rc);
1233         }
1234
1235         if (!dt_object_exists(obj)) {
1236                 exist = false;
1237                 goto replace;
1238         }
1239
1240         rc = dt_lookup(env, parent, (struct dt_rec *)tfid,
1241                        (const struct dt_key *)name, BYPASS_CAPA);
1242         if (rc == -ENOENT) {
1243                 exist = false;
1244                 goto replace;
1245         }
1246
1247         if (rc != 0)
1248                 GOTO(log, rc);
1249
1250         /* Someone changed the name entry, cannot replace it. */
1251         if (!lu_fid_eq(cfid, tfid))
1252                 GOTO(log, rc = 0);
1253
1254         /* lock the object to be destroyed. */
1255         rc = lfsck_ibits_lock(env, lfsck, obj, &clh,
1256                               MDS_INODELOCK_UPDATE |
1257                               MDS_INODELOCK_XATTR, LCK_EX);
1258         if (rc != 0)
1259                 GOTO(log, rc);
1260
1261         if (unlikely(lfsck_is_dead_obj(obj))) {
1262                 exist = false;
1263                 goto replace;
1264         }
1265
1266         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
1267         if (rc != 0)
1268                 GOTO(log, rc);
1269
1270         /* The object has been modified by other(s), or it is not created by
1271          * LFSCK, the two cases are indistinguishable. So cannot replace it. */
1272         if (la->la_ctime != 0)
1273                 GOTO(log, rc);
1274
1275         if (S_ISREG(la->la_mode)) {
1276                 rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LOV,
1277                                   BYPASS_CAPA);
1278                 /* If someone has created related OST-object(s),
1279                  * then keep it. */
1280                 if ((rc > 0) || (rc < 0 && rc != -ENODATA))
1281                         GOTO(log, rc = (rc > 0 ? 0 : rc));
1282         }
1283
1284 replace:
1285         dt_read_lock(env, child, 0);
1286         rc = lfsck_links_read2(env, child, &ldata);
1287         dt_read_unlock(env, child);
1288
1289         /* Someone changed the child, no need to replace. */
1290         if (rc == -ENODATA)
1291                 GOTO(log, rc = 0);
1292
1293         if (rc != 0)
1294                 GOTO(log, rc);
1295
1296         rc = linkea_links_find(&ldata, cname, lfsck_dto2fid(parent));
1297         /* Someone moved the child, no need to replace. */
1298         if (rc != 0)
1299                 GOTO(log, rc = 0);
1300
1301         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1302                 GOTO(log, rc = 1);
1303
1304         th = dt_trans_create(env, dev);
1305         if (IS_ERR(th))
1306                 GOTO(log, rc = PTR_ERR(th));
1307
1308         if (exist) {
1309                 rc = dt_declare_destroy(env, obj, th);
1310                 if (rc != 0)
1311                         GOTO(stop, rc);
1312         }
1313
1314         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
1315         if (rc != 0)
1316                 GOTO(stop, rc);
1317
1318         rec->rec_type = S_IFDIR;
1319         rec->rec_fid = lfsck_dto2fid(child);
1320         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1321                                (const struct dt_key *)name, th);
1322         if (rc != 0)
1323                 GOTO(stop, rc);
1324
1325         rc = dt_trans_start(env, dev, th);
1326         if (rc != 0)
1327                 GOTO(stop, rc);
1328
1329         if (exist) {
1330                 rc = dt_destroy(env, obj, th);
1331                 if (rc != 0)
1332                         GOTO(stop, rc);
1333         }
1334
1335         /* The old name entry maybe not exist. */
1336         dt_delete(env, parent, (const struct dt_key *)name, th,
1337                   BYPASS_CAPA);
1338
1339         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1340                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
1341
1342         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1343
1344 stop:
1345         dt_trans_stop(env, dev, th);
1346
1347 log:
1348         lfsck_ibits_unlock(&clh, LCK_EX);
1349         lfsck_ibits_unlock(&plh, LCK_EX);
1350         if (obj != NULL && !IS_ERR(obj))
1351                 lfsck_object_put(env, obj);
1352
1353         CDEBUG(D_LFSCK, "%s: namespace LFSCK conditionally destroy the "
1354                "object "DFID" because of conflict with the object "DFID
1355                " under the parent "DFID" with name %s: rc = %d\n",
1356                lfsck_lfsck2name(lfsck), PFID(cfid),
1357                PFID(lfsck_dto2fid(child)), PFID(lfsck_dto2fid(parent)),
1358                name, rc);
1359
1360         return rc;
1361 }
1362
1363 /**
1364  * Overwrite the linkEA for the object with the given ldata.
1365  *
1366  * The caller should take the ldlm lock before the calling.
1367  *
1368  * \param[in] env       pointer to the thread context
1369  * \param[in] com       pointer to the lfsck component
1370  * \param[in] obj       pointer to the dt_object to be handled
1371  * \param[in] ldata     pointer to the new linkEA data
1372  *
1373  * \retval              positive number for repaired cases
1374  * \retval              0 if nothing to be repaired
1375  * \retval              negative error number on failure
1376  */
1377 int lfsck_namespace_rebuild_linkea(const struct lu_env *env,
1378                                    struct lfsck_component *com,
1379                                    struct dt_object *obj,
1380                                    struct linkea_data *ldata)
1381 {
1382         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1383         struct dt_device                *dev    = lfsck->li_bottom;
1384         struct thandle                  *th     = NULL;
1385         struct lu_buf                    linkea_buf;
1386         int                              rc     = 0;
1387         ENTRY;
1388
1389         LASSERT(!dt_object_remote(obj));
1390
1391         th = dt_trans_create(env, dev);
1392         if (IS_ERR(th))
1393                 GOTO(log, rc = PTR_ERR(th));
1394
1395         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
1396                        ldata->ld_leh->leh_len);
1397         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1398                                   XATTR_NAME_LINK, 0, th);
1399         if (rc != 0)
1400                 GOTO(stop, rc);
1401
1402         rc = dt_trans_start_local(env, dev, th);
1403         if (rc != 0)
1404                 GOTO(stop, rc);
1405
1406         dt_write_lock(env, obj, 0);
1407         if (unlikely(lfsck_is_dead_obj(obj)))
1408                 GOTO(unlock, rc = 0);
1409
1410         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1411                 GOTO(unlock, rc = 1);
1412
1413         rc = dt_xattr_set(env, obj, &linkea_buf,
1414                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
1415
1416         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
1417
1418 unlock:
1419         dt_write_unlock(env, obj);
1420
1421 stop:
1422         dt_trans_stop(env, dev, th);
1423
1424 log:
1425         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild linkEA for the "
1426                "object "DFID": rc = %d\n",
1427                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
1428
1429         if (rc != 0) {
1430                 struct lfsck_namespace *ns = com->lc_file_ram;
1431
1432                 ns->ln_flags |= LF_INCONSISTENT;
1433         }
1434
1435         return rc;
1436 }
1437
1438 /**
1439  * Repair invalid name entry.
1440  *
1441  * If the name entry contains invalid information, such as bad file type
1442  * or (and) corrupted object FID, then either remove the name entry or
1443  * udpate the name entry with the given (right) information.
1444  *
1445  * \param[in] env       pointer to the thread context
1446  * \param[in] com       pointer to the lfsck component
1447  * \param[in] parent    pointer to the parent directory
1448  * \param[in] child     pointer to the object referenced by the name entry
1449  * \param[in] name      the old name of the child under the parent directory
1450  * \param[in] name2     the new name of the child under the parent directory
1451  * \param[in] type      the type claimed by the name entry
1452  * \param[in] update    update the name entry if true; otherwise, remove it
1453  * \param[in] dec       decrease the parent nlink count if true
1454  *
1455  * \retval              positive number for repaired successfully
1456  * \retval              0 if nothing to be repaired
1457  * \retval              negative error number on failure
1458  */
1459 int lfsck_namespace_repair_dirent(const struct lu_env *env,
1460                                   struct lfsck_component *com,
1461                                   struct dt_object *parent,
1462                                   struct dt_object *child,
1463                                   const char *name, const char *name2,
1464                                   __u16 type, bool update, bool dec)
1465 {
1466         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1467         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1468         const struct lu_fid             *cfid   = lfsck_dto2fid(child);
1469         struct lu_fid                   *tfid   = &info->lti_fid5;
1470         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1471         struct dt_device                *dev    = lfsck->li_next;
1472         struct thandle                  *th     = NULL;
1473         struct lustre_handle             lh     = { 0 };
1474         int                              rc     = 0;
1475         ENTRY;
1476
1477         if (unlikely(!dt_try_as_dir(env, parent)))
1478                 GOTO(log, rc = -ENOTDIR);
1479
1480         rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
1481                               MDS_INODELOCK_UPDATE, LCK_EX);
1482         if (rc != 0)
1483                 GOTO(log, rc);
1484
1485         th = dt_trans_create(env, dev);
1486         if (IS_ERR(th))
1487                 GOTO(unlock1, rc = PTR_ERR(th));
1488
1489         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
1490         if (rc != 0)
1491                 GOTO(stop, rc);
1492
1493         if (update) {
1494                 rec->rec_type = lfsck_object_type(child) & S_IFMT;
1495                 rec->rec_fid = cfid;
1496                 rc = dt_declare_insert(env, parent,
1497                                        (const struct dt_rec *)rec,
1498                                        (const struct dt_key *)name2, th);
1499                 if (rc != 0)
1500                         GOTO(stop, rc);
1501         }
1502
1503         if (dec) {
1504                 rc = dt_declare_ref_del(env, parent, th);
1505                 if (rc != 0)
1506                         GOTO(stop, rc);
1507         }
1508
1509         rc = dt_trans_start(env, dev, th);
1510         if (rc != 0)
1511                 GOTO(stop, rc);
1512
1513         dt_write_lock(env, parent, 0);
1514         rc = dt_lookup(env, parent, (struct dt_rec *)tfid,
1515                        (const struct dt_key *)name, BYPASS_CAPA);
1516         /* Someone has removed the bad name entry by race. */
1517         if (rc == -ENOENT)
1518                 GOTO(unlock2, rc = 0);
1519
1520         if (rc != 0)
1521                 GOTO(unlock2, rc);
1522
1523         /* Someone has removed the bad name entry and reused it for other
1524          * object by race. */
1525         if (!lu_fid_eq(tfid, cfid))
1526                 GOTO(unlock2, rc = 0);
1527
1528         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1529                 GOTO(unlock2, rc = 1);
1530
1531         rc = dt_delete(env, parent, (const struct dt_key *)name, th,
1532                        BYPASS_CAPA);
1533         if (rc != 0)
1534                 GOTO(unlock2, rc);
1535
1536         if (update) {
1537                 rc = dt_insert(env, parent,
1538                                (const struct dt_rec *)rec,
1539                                (const struct dt_key *)name2, th,
1540                                BYPASS_CAPA, 1);
1541                 if (rc != 0)
1542                         GOTO(unlock2, rc);
1543         }
1544
1545         if (dec) {
1546                 rc = dt_ref_del(env, parent, th);
1547                 if (rc != 0)
1548                         GOTO(unlock2, rc);
1549         }
1550
1551         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
1552
1553 unlock2:
1554         dt_write_unlock(env, parent);
1555
1556 stop:
1557         dt_trans_stop(env, dev, th);
1558
1559         /* We are not sure whether the child will become orphan or not.
1560          * Record it in the LFSCK tracing file for further checking in
1561          * the second-stage scanning. */
1562         if (!update && !dec && rc == 0)
1563                 lfsck_namespace_trace_update(env, com, cfid,
1564                                              LNTF_CHECK_LINKEA, true);
1565
1566 unlock1:
1567         lfsck_ibits_unlock(&lh, LCK_EX);
1568
1569 log:
1570         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found bad name "
1571                "entry for: parent "DFID", child "DFID", name %s, type "
1572                "in name entry %o, type claimed by child %o. repair it "
1573                "by %s with new name2 %s: rc = %d\n", lfsck_lfsck2name(lfsck),
1574                PFID(lfsck_dto2fid(parent)), PFID(lfsck_dto2fid(child)),
1575                name, type, update ? lfsck_object_type(child) : 0,
1576                update ? "updating" : "removing", name2, rc);
1577
1578         if (rc != 0) {
1579                 struct lfsck_namespace *ns = com->lc_file_ram;
1580
1581                 ns->ln_flags |= LF_INCONSISTENT;
1582         }
1583
1584         return rc;
1585 }
1586
1587 /**
1588  * Update the ".." name entry for the given object.
1589  *
1590  * The object's ".." is corrupted, this function will update the ".." name
1591  * entry with the given pfid, and the linkEA with the given ldata.
1592  *
1593  * The caller should take the ldlm lock before the calling.
1594  *
1595  * \param[in] env       pointer to the thread context
1596  * \param[in] com       pointer to the lfsck component
1597  * \param[in] obj       pointer to the dt_object to be handled
1598  * \param[in] pfid      the new fid for the object's ".." name entry
1599  * \param[in] cname     the name for the @obj in the parent directory
1600  *
1601  * \retval              positive number for repaired cases
1602  * \retval              0 if nothing to be repaired
1603  * \retval              negative error number on failure
1604  */
1605 static int lfsck_namespace_repair_unmatched_pairs(const struct lu_env *env,
1606                                                   struct lfsck_component *com,
1607                                                   struct dt_object *obj,
1608                                                   const struct lu_fid *pfid,
1609                                                   struct lu_name *cname)
1610 {
1611         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1612         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1613         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1614         struct dt_device                *dev    = lfsck->li_bottom;
1615         struct thandle                  *th     = NULL;
1616         struct linkea_data               ldata  = { 0 };
1617         struct lu_buf                    linkea_buf;
1618         int                              rc     = 0;
1619         ENTRY;
1620
1621         LASSERT(!dt_object_remote(obj));
1622         LASSERT(S_ISDIR(lfsck_object_type(obj)));
1623
1624         rc = linkea_data_new(&ldata, &info->lti_big_buf);
1625         if (rc != 0)
1626                 GOTO(log, rc);
1627
1628         rc = linkea_add_buf(&ldata, cname, pfid);
1629         if (rc != 0)
1630                 GOTO(log, rc);
1631
1632         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
1633                        ldata.ld_leh->leh_len);
1634
1635         th = dt_trans_create(env, dev);
1636         if (IS_ERR(th))
1637                 GOTO(log, rc = PTR_ERR(th));
1638
1639         rc = dt_declare_delete(env, obj, (const struct dt_key *)dotdot, th);
1640         if (rc != 0)
1641                 GOTO(stop, rc);
1642
1643         rec->rec_type = S_IFDIR;
1644         rec->rec_fid = pfid;
1645         rc = dt_declare_insert(env, obj, (const struct dt_rec *)rec,
1646                                (const struct dt_key *)dotdot, th);
1647         if (rc != 0)
1648                 GOTO(stop, rc);
1649
1650         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1651                                   XATTR_NAME_LINK, 0, th);
1652         if (rc != 0)
1653                 GOTO(stop, rc);
1654
1655         rc = dt_trans_start_local(env, dev, th);
1656         if (rc != 0)
1657                 GOTO(stop, rc);
1658
1659         dt_write_lock(env, obj, 0);
1660         if (unlikely(lfsck_is_dead_obj(obj)))
1661                 GOTO(unlock, rc = 0);
1662
1663         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1664                 GOTO(unlock, rc = 1);
1665
1666         /* The old ".." name entry maybe not exist. */
1667         dt_delete(env, obj, (const struct dt_key *)dotdot, th,
1668                   BYPASS_CAPA);
1669
1670         rc = dt_insert(env, obj, (const struct dt_rec *)rec,
1671                        (const struct dt_key *)dotdot, th, BYPASS_CAPA, 1);
1672         if (rc != 0)
1673                 GOTO(unlock, rc);
1674
1675         rc = dt_xattr_set(env, obj, &linkea_buf,
1676                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
1677
1678         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
1679
1680 unlock:
1681         dt_write_unlock(env, obj);
1682
1683 stop:
1684         dt_trans_stop(env, dev, th);
1685
1686 log:
1687         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild dotdot name entry for "
1688                "the object "DFID", new parent "DFID": rc = %d\n",
1689                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)),
1690                PFID(pfid), rc);
1691
1692         if (rc != 0) {
1693                 struct lfsck_namespace *ns = com->lc_file_ram;
1694
1695                 ns->ln_flags |= LF_INCONSISTENT;
1696         }
1697
1698         return rc;
1699 }
1700
1701 /**
1702  * Handle orphan @obj during Double Scan Directory.
1703  *
1704  * Remove the @obj's current (invalid) linkEA entries, and insert
1705  * it in the directory .lustre/lost+found/MDTxxxx/ with the name:
1706  * ${FID}-${PFID}-D-${conflict_version}
1707  *
1708  * The caller should take the ldlm lock before the calling.
1709  *
1710  * \param[in] env       pointer to the thread context
1711  * \param[in] com       pointer to the lfsck component
1712  * \param[in] obj       pointer to the orphan object to be handled
1713  * \param[in] pfid      the new fid for the object's ".." name entry
1714  * \param[in,out] lh    ldlm lock handler for the given @obj
1715  * \param[out] type     to tell the caller what the inconsistency is
1716  *
1717  * \retval              positive number for repaired cases
1718  * \retval              0 if nothing to be repaired
1719  * \retval              negative error number on failure
1720  */
1721 static int
1722 lfsck_namespace_dsd_orphan(const struct lu_env *env,
1723                            struct lfsck_component *com,
1724                            struct dt_object *obj,
1725                            const struct lu_fid *pfid,
1726                            struct lustre_handle *lh,
1727                            enum lfsck_namespace_inconsistency_type *type)
1728 {
1729         struct lfsck_thread_info *info = lfsck_env_info(env);
1730         int                       rc;
1731         ENTRY;
1732
1733         /* Remove the unrecognized linkEA. */
1734         rc = lfsck_namespace_links_remove(env, com, obj);
1735         lfsck_ibits_unlock(lh, LCK_EX);
1736         if (rc < 0 && rc != -ENODATA)
1737                 RETURN(rc);
1738
1739         *type = LNIT_MUL_REF;
1740         /* The unique linkEA is invalid, even if the ".." name entry may be
1741          * valid, we still cannot know via which name entry this directory
1742          * will be referenced. Then handle it as pure orphan. */
1743         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
1744                  "-"DFID, PFID(pfid));
1745         rc = lfsck_namespace_insert_orphan(env, com, obj,
1746                                            info->lti_tmpbuf, "D", NULL);
1747
1748         RETURN(rc);
1749 }
1750
1751 /**
1752  * Double Scan Directory object for single linkEA entry case.
1753  *
1754  * The given @child has unique linkEA entry. If the linkEA entry is valid,
1755  * then check whether the name is in the namespace or not, if not, add the
1756  * missing name entry back to namespace. If the linkEA entry is invalid,
1757  * then remove it and insert the @child in the .lustre/lost+found/MDTxxxx/
1758  * as an orphan.
1759  *
1760  * \param[in] env       pointer to the thread context
1761  * \param[in] com       pointer to the lfsck component
1762  * \param[in] child     pointer to the directory to be double scanned
1763  * \param[in] pfid      the FID corresponding to the ".." entry
1764  * \param[in] ldata     pointer to the linkEA data for the given @child
1765  * \param[in,out] lh    ldlm lock handler for the given @child
1766  * \param[out] type     to tell the caller what the inconsistency is
1767  * \param[in] retry     if found inconsistency, but the caller does not hold
1768  *                      ldlm lock on the @child, then set @retry as true
1769  *
1770  * \retval              positive number for repaired cases
1771  * \retval              0 if nothing to be repaired
1772  * \retval              negative error number on failure
1773  */
1774 static int
1775 lfsck_namespace_dsd_single(const struct lu_env *env,
1776                            struct lfsck_component *com,
1777                            struct dt_object *child,
1778                            const struct lu_fid *pfid,
1779                            struct linkea_data *ldata,
1780                            struct lustre_handle *lh,
1781                            enum lfsck_namespace_inconsistency_type *type,
1782                            bool *retry)
1783 {
1784         struct lfsck_thread_info *info          = lfsck_env_info(env);
1785         struct lu_name           *cname         = &info->lti_name;
1786         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
1787         struct lu_fid            *tfid          = &info->lti_fid3;
1788         struct lfsck_instance    *lfsck         = com->lc_lfsck;
1789         struct dt_object         *parent        = NULL;
1790         int                       rc            = 0;
1791         ENTRY;
1792
1793         lfsck_namespace_unpack_linkea_entry(ldata, cname, tfid, info->lti_key);
1794         /* The unique linkEA entry with bad parent will be handled as orphan. */
1795         if (!fid_is_sane(tfid)) {
1796                 if (!lustre_handle_is_used(lh) && retry != NULL)
1797                         *retry = true;
1798                 else
1799                         rc = lfsck_namespace_dsd_orphan(env, com, child,
1800                                                         pfid, lh, type);
1801
1802                 GOTO(out, rc);
1803         }
1804
1805         parent = lfsck_object_find_bottom(env, lfsck, tfid);
1806         if (IS_ERR(parent))
1807                 GOTO(out, rc = PTR_ERR(parent));
1808
1809         /* We trust the unique linkEA entry in spite of whether it matches the
1810          * ".." name entry or not. Because even if the linkEA entry is wrong
1811          * and the ".." name entry is right, we still cannot know via which
1812          * name entry the child will be referenced, since all known entries
1813          * have been verified during the first-stage scanning. */
1814         if (!dt_object_exists(parent)) {
1815                 if (!lustre_handle_is_used(lh) && retry != NULL) {
1816                         *retry = true;
1817
1818                         GOTO(out, rc = 0);
1819                 }
1820
1821                 lfsck_ibits_unlock(lh, LCK_EX);
1822                 /* Create the lost parent as an orphan. */
1823                 rc = lfsck_namespace_create_orphan(env, com, parent);
1824                 if (rc >= 0) {
1825                         /* Add the missing name entry to the parent. */
1826                         rc = lfsck_namespace_insert_normal(env, com, parent,
1827                                                         child, cname->ln_name);
1828                         if (unlikely(rc == -EEXIST)) {
1829                                 /* Unfortunately, someone reused the name
1830                                  * under the parent by race. So we have
1831                                  * to remove the linkEA entry from
1832                                  * current child object. It means that the
1833                                  * LFSCK cannot recover the system
1834                                  * totally back to its original status,
1835                                  * but it is necessary to make the
1836                                  * current system to be consistent. */
1837                                 rc = lfsck_namespace_shrink_linkea(env,
1838                                                 com, child, ldata,
1839                                                 cname, tfid, true);
1840                                 if (rc >= 0) {
1841                                         snprintf(info->lti_tmpbuf,
1842                                                  sizeof(info->lti_tmpbuf),
1843                                                  "-"DFID, PFID(pfid));
1844                                         rc = lfsck_namespace_insert_orphan(env,
1845                                                 com, child, info->lti_tmpbuf,
1846                                                 "D", NULL);
1847                                 }
1848                         }
1849                 }
1850
1851                 GOTO(out, rc);
1852         }
1853
1854         /* The unique linkEA entry with bad parent will be handled as orphan. */
1855         if (unlikely(!dt_try_as_dir(env, parent))) {
1856                 if (!lustre_handle_is_used(lh) && retry != NULL)
1857                         *retry = true;
1858                 else
1859                         rc = lfsck_namespace_dsd_orphan(env, com, child,
1860                                                         pfid, lh, type);
1861
1862                 GOTO(out, rc);
1863         }
1864
1865         rc = dt_lookup(env, parent, (struct dt_rec *)tfid,
1866                        (const struct dt_key *)cname->ln_name, BYPASS_CAPA);
1867         if (rc == -ENOENT) {
1868                 if (!lustre_handle_is_used(lh) && retry != NULL) {
1869                         *retry = true;
1870
1871                         GOTO(out, rc = 0);
1872                 }
1873
1874                 lfsck_ibits_unlock(lh, LCK_EX);
1875                 /* Add the missing name entry back to the namespace. */
1876                 rc = lfsck_namespace_insert_normal(env, com, parent, child,
1877                                                    cname->ln_name);
1878                 if (unlikely(rc == -EEXIST)) {
1879                         /* Unfortunately, someone reused the name under the
1880                          * parent by race. So we have to remove the linkEA
1881                          * entry from current child object. It means that the
1882                          * LFSCK cannot recover the system totally back to
1883                          * its original status, but it is necessary to make
1884                          * the current system to be consistent.
1885                          *
1886                          * It also may be because of the LFSCK found some
1887                          * internal status of create operation. Under such
1888                          * case, nothing to be done. */
1889                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
1890                                         parent, child, ldata, cname, tfid);
1891                         if (rc >= 0) {
1892                                 snprintf(info->lti_tmpbuf,
1893                                          sizeof(info->lti_tmpbuf),
1894                                          "-"DFID, PFID(pfid));
1895                                 rc = lfsck_namespace_insert_orphan(env, com,
1896                                         child, info->lti_tmpbuf, "D", NULL);
1897                         }
1898                 }
1899
1900                 GOTO(out, rc);
1901         }
1902
1903         if (rc != 0)
1904                 GOTO(out, rc);
1905
1906         if (!lu_fid_eq(tfid, cfid)) {
1907                 if (!lustre_handle_is_used(lh) && retry != NULL) {
1908                         *retry = true;
1909
1910                         GOTO(out, rc = 0);
1911                 }
1912
1913                 lfsck_ibits_unlock(lh, LCK_EX);
1914                 /* The name entry references another MDT-object that
1915                  * may be created by the LFSCK for repairing dangling
1916                  * name entry. Try to replace it. */
1917                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
1918                                                   tfid, cname);
1919                 if (rc == 0)
1920                         rc = lfsck_namespace_dsd_orphan(env, com, child,
1921                                                         pfid, lh, type);
1922
1923                 GOTO(out, rc);
1924         }
1925
1926         /* The ".." name entry is wrong, update it. */
1927         if (!lu_fid_eq(pfid, lfsck_dto2fid(parent))) {
1928                 if (!lustre_handle_is_used(lh) && retry != NULL) {
1929                         *retry = true;
1930
1931                         GOTO(out, rc = 0);
1932                 }
1933
1934                 *type = LNIT_UNMATCHED_PAIRS;
1935                 rc = lfsck_namespace_repair_unmatched_pairs(env, com, child,
1936                                                 lfsck_dto2fid(parent), cname);
1937         }
1938
1939         GOTO(out, rc);
1940
1941 out:
1942         if (parent != NULL && !IS_ERR(parent))
1943                 lfsck_object_put(env, parent);
1944
1945         return rc;
1946 }
1947
1948 /**
1949  * Double Scan Directory object for multiple linkEA entries case.
1950  *
1951  * The given @child has multiple linkEA entries. There is at most one linkEA
1952  * entry will be valid, all the others will be removed. Firstly, the function
1953  * will try to find out the linkEA entry for which the name entry exists under
1954  * the given parent (@pfid). If there is no linkEA entry that matches the given
1955  * ".." name entry, then tries to find out the first linkEA entry that both the
1956  * parent and the name entry exist to rebuild a new ".." name entry.
1957  *
1958  * \param[in] env       pointer to the thread context
1959  * \param[in] com       pointer to the lfsck component
1960  * \param[in] child     pointer to the directory to be double scanned
1961  * \param[in] pfid      the FID corresponding to the ".." entry
1962  * \param[in] ldata     pointer to the linkEA data for the given @child
1963  * \param[in,out] lh    ldlm lock handler for the given @child
1964  * \param[out] type     to tell the caller what the inconsistency is
1965  * \param[in] lpf       true if the ".." entry is under lost+found/MDTxxxx/
1966  *
1967  * \retval              positive number for repaired cases
1968  * \retval              0 if nothing to be repaired
1969  * \retval              negative error number on failure
1970  */
1971 static int
1972 lfsck_namespace_dsd_multiple(const struct lu_env *env,
1973                              struct lfsck_component *com,
1974                              struct dt_object *child,
1975                              const struct lu_fid *pfid,
1976                              struct linkea_data *ldata,
1977                              struct lustre_handle *lh,
1978                              enum lfsck_namespace_inconsistency_type *type,
1979                              bool lpf)
1980 {
1981         struct lfsck_thread_info *info          = lfsck_env_info(env);
1982         struct lu_name           *cname         = &info->lti_name;
1983         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
1984         struct lu_fid            *tfid          = &info->lti_fid3;
1985         struct lu_fid            *pfid2         = &info->lti_fid4;
1986         struct lfsck_namespace   *ns            = com->lc_file_ram;
1987         struct lfsck_instance    *lfsck         = com->lc_lfsck;
1988         struct lfsck_bookmark    *bk            = &lfsck->li_bookmark_ram;
1989         struct dt_object         *parent        = NULL;
1990         struct linkea_data        ldata_new     = { 0 };
1991         int                       count         = 0;
1992         int                       rc            = 0;
1993         bool                      once          = true;
1994         ENTRY;
1995
1996 again:
1997         while (ldata->ld_lee != NULL) {
1998                 lfsck_namespace_unpack_linkea_entry(ldata, cname, tfid,
1999                                                     info->lti_key);
2000                 /* Drop repeated linkEA entries. */
2001                 lfsck_namespace_filter_linkea_entry(ldata, cname, tfid, true);
2002                 /* Drop invalid linkEA entry. */
2003                 if (!fid_is_sane(tfid)) {
2004                         linkea_del_buf(ldata, cname);
2005                         continue;
2006                 }
2007
2008                 /* If current dotdot is the .lustre/lost+found/MDTxxxx/,
2009                  * then it is possible that: the directry object has ever
2010                  * been lost, but its name entry was there. In the former
2011                  * LFSCK run, during the first-stage scanning, the LFSCK
2012                  * found the dangling name entry, but it did not recreate
2013                  * the lost object, and when moved to the second-stage
2014                  * scanning, some children objects of the lost directory
2015                  * object were found, then the LFSCK recreated such lost
2016                  * directory object as an orphan.
2017                  *
2018                  * When the LFSCK runs again, if the dangling name is still
2019                  * there, the LFSCK should move the orphan directory object
2020                  * back to the normal namespace. */
2021                 if (!lpf && !lu_fid_eq(pfid, tfid) && once) {
2022                         linkea_next_entry(ldata);
2023                         continue;
2024                 }
2025
2026                 parent = lfsck_object_find_bottom(env, lfsck, tfid);
2027                 if (IS_ERR(parent))
2028                         RETURN(PTR_ERR(parent));
2029
2030                 if (!dt_object_exists(parent)) {
2031                         lfsck_object_put(env, parent);
2032                         if (ldata->ld_leh->leh_reccount > 1) {
2033                                 /* If it is NOT the last linkEA entry, then
2034                                  * there is still other chance to make the
2035                                  * child to be visible via other parent, then
2036                                  * remove this linkEA entry. */
2037                                 linkea_del_buf(ldata, cname);
2038                                 continue;
2039                         }
2040
2041                         break;
2042                 }
2043
2044                 /* The linkEA entry with bad parent will be removed. */
2045                 if (unlikely(!dt_try_as_dir(env, parent))) {
2046                         lfsck_object_put(env, parent);
2047                         linkea_del_buf(ldata, cname);
2048                         continue;
2049                 }
2050
2051                 rc = dt_lookup(env, parent, (struct dt_rec *)tfid,
2052                                (const struct dt_key *)cname->ln_name,
2053                                BYPASS_CAPA);
2054                 *pfid2 = *lfsck_dto2fid(parent);
2055                 if (rc == -ENOENT) {
2056                         lfsck_object_put(env, parent);
2057                         linkea_next_entry(ldata);
2058                         continue;
2059                 }
2060
2061                 if (rc != 0) {
2062                         lfsck_object_put(env, parent);
2063
2064                         RETURN(rc);
2065                 }
2066
2067                 if (lu_fid_eq(tfid, cfid)) {
2068                         lfsck_object_put(env, parent);
2069                         if (!lu_fid_eq(pfid, pfid2)) {
2070                                 *type = LNIT_UNMATCHED_PAIRS;
2071                                 rc = lfsck_namespace_repair_unmatched_pairs(env,
2072                                                 com, child, pfid2, cname);
2073
2074                                 RETURN(rc);
2075                         }
2076
2077 rebuild:
2078                         /* It is the most common case that we find the
2079                          * name entry corresponding to the linkEA entry
2080                          * that matches the ".." name entry. */
2081                         rc = linkea_data_new(&ldata_new, &info->lti_big_buf);
2082                         if (rc != 0)
2083                                 RETURN(rc);
2084
2085                         rc = linkea_add_buf(&ldata_new, cname, pfid2);
2086                         if (rc != 0)
2087                                 RETURN(rc);
2088
2089                         rc = lfsck_namespace_rebuild_linkea(env, com, child,
2090                                                             &ldata_new);
2091                         if (rc < 0)
2092                                 RETURN(rc);
2093
2094                         linkea_del_buf(ldata, cname);
2095                         linkea_first_entry(ldata);
2096                         /* There may be some invalid dangling name entries under
2097                          * other parent directories, remove all of them. */
2098                         while (ldata->ld_lee != NULL) {
2099                                 lfsck_namespace_unpack_linkea_entry(ldata,
2100                                                 cname, tfid, info->lti_key);
2101                                 if (!fid_is_sane(tfid))
2102                                         goto next;
2103
2104                                 parent = lfsck_object_find_bottom(env, lfsck,
2105                                                                   tfid);
2106                                 if (IS_ERR(parent)) {
2107                                         rc = PTR_ERR(parent);
2108                                         if (rc != -ENOENT &&
2109                                             bk->lb_param & LPF_FAILOUT)
2110                                                 RETURN(rc);
2111
2112                                         goto next;
2113                                 }
2114
2115                                 if (!dt_object_exists(parent)) {
2116                                         lfsck_object_put(env, parent);
2117                                         goto next;
2118                                 }
2119
2120                                 rc = lfsck_namespace_repair_dirent(env, com,
2121                                         parent, child, cname->ln_name,
2122                                         cname->ln_name, S_IFDIR, false, true);
2123                                 lfsck_object_put(env, parent);
2124                                 if (rc < 0) {
2125                                         if (bk->lb_param & LPF_FAILOUT)
2126                                                 RETURN(rc);
2127
2128                                         goto next;
2129                                 }
2130
2131                                 count += rc;
2132
2133 next:
2134                                 linkea_del_buf(ldata, cname);
2135                         }
2136
2137                         ns->ln_dirent_repaired += count;
2138
2139                         RETURN(rc);
2140                 }
2141
2142                 lfsck_ibits_unlock(lh, LCK_EX);
2143                 /* The name entry references another MDT-object that may be
2144                  * created by the LFSCK for repairing dangling name entry.
2145                  * Try to replace it. */
2146                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
2147                                                   tfid, cname);
2148                 lfsck_object_put(env, parent);
2149                 if (rc < 0)
2150                         RETURN(rc);
2151
2152                 if (rc > 0)
2153                         goto rebuild;
2154
2155                 linkea_del_buf(ldata, cname);
2156         }
2157
2158         if (ldata->ld_leh->leh_reccount == 1) {
2159                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, ldata,
2160                                                 lh, type, NULL);
2161
2162                 RETURN(rc);
2163         }
2164
2165         /* All linkEA entries are invalid and removed, then handle the @child
2166          * as an orphan.*/
2167         if (ldata->ld_leh->leh_reccount == 0) {
2168                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, lh,
2169                                                 type);
2170
2171                 RETURN(rc);
2172         }
2173
2174         linkea_first_entry(ldata);
2175         /* If the dangling name entry for the orphan directory object has
2176          * been remvoed, then just check whether the directory object is
2177          * still under the .lustre/lost+found/MDTxxxx/ or not. */
2178         if (lpf) {
2179                 lpf = false;
2180                 goto again;
2181         }
2182
2183         /* There is no linkEA entry that matches the ".." name entry. Find
2184          * the first linkEA entry that both parent and name entry exist to
2185          * rebuild a new ".." name entry. */
2186         if (once) {
2187                 once = false;
2188                 goto again;
2189         }
2190
2191         RETURN(rc);
2192 }
2193
2194 /**
2195  * Double scan the directory object for namespace LFSCK.
2196  *
2197  * This function will verify the <parent, child> pairs in the namespace tree:
2198  * the parent references the child via some name entry that should be in the
2199  * child's linkEA entry, the child should back references the parent via its
2200  * ".." name entry.
2201  *
2202  * The LFSCK will scan every linkEA entry in turn until find out the first
2203  * matched pairs. If found, then all other linkEA entries will be dropped.
2204  * If all the linkEA entries cannot match the ".." name entry, then there
2205  * are serveral possible cases:
2206  *
2207  * 1) If there is only one linkEA entry, then trust it as long as the PFID
2208  *    in the linkEA entry is valid.
2209  *
2210  * 2) If there are multiple linkEA entries, then try to find the linkEA
2211  *    that matches the ".." name entry. If found, then all other entries
2212  *    are invalid; otherwise, it is quite possible that the ".." name entry
2213  *    is corrupted. Under such case, the LFSCK will rebuild the ".." name
2214  *    entry according to the first valid linkEA entry (both the parent and
2215  *    the name entry should exist).
2216  *
2217  * 3) If the directory object has no (valid) linkEA entry, then the
2218  *    directory object will be handled as pure orphan and inserted
2219  *    in the .lustre/lost+found/MDTxxxx/ with the name:
2220  *    ${self_FID}-${PFID}-D-${conflict_version}
2221  *
2222  * \param[in] env       pointer to the thread context
2223  * \param[in] com       pointer to the lfsck component
2224  * \param[in] child     pointer to the directory object to be handled
2225  * \param[in] flags     to indicate the specical checking on the @child
2226  *
2227  * \retval              positive number for repaired cases
2228  * \retval              0 if nothing to be repaired
2229  * \retval              negative error number on failure
2230  */
2231 static int lfsck_namespace_double_scan_dir(const struct lu_env *env,
2232                                            struct lfsck_component *com,
2233                                            struct dt_object *child, __u8 flags)
2234 {
2235         struct lfsck_thread_info *info          = lfsck_env_info(env);
2236         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2237         struct lu_fid            *pfid          = &info->lti_fid2;
2238         struct lfsck_namespace   *ns            = com->lc_file_ram;
2239         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2240         struct lustre_handle      lh            = { 0 };
2241         struct linkea_data        ldata         = { 0 };
2242         bool                      unknown       = false;
2243         bool                      lpf           = false;
2244         bool                      retry         = false;
2245         enum lfsck_namespace_inconsistency_type type = LNIT_BAD_LINKEA;
2246         int                       rc            = 0;
2247         ENTRY;
2248
2249         LASSERT(!dt_object_remote(child));
2250
2251         if (!(lfsck->li_bookmark_ram.lb_param & LPF_ALL_TGT)) {
2252                 CDEBUG(D_LFSCK, "%s: some MDT(s) maybe NOT take part in the"
2253                        "the namespace LFSCK, then the LFSCK cannot guarantee"
2254                        "all the name entries have been verified in first-stage"
2255                        "scanning. So have to skip orphan related handling for"
2256                        "the directory object "DFID" with remote name entry\n",
2257                        lfsck_lfsck2name(lfsck), PFID(cfid));
2258
2259                 RETURN(0);
2260         }
2261
2262         if (unlikely(!dt_try_as_dir(env, child)))
2263                 GOTO(out, rc = -ENOTDIR);
2264
2265         /* We only take ldlm lock on the @child when required. When the
2266          * logic comes here for the first time, it is always false. */
2267         if (0) {
2268
2269 lock:
2270                 rc = lfsck_ibits_lock(env, lfsck, child, &lh,
2271                                       MDS_INODELOCK_UPDATE |
2272                                       MDS_INODELOCK_XATTR, LCK_EX);
2273                 if (rc != 0)
2274                         GOTO(out, rc);
2275         }
2276
2277         dt_read_lock(env, child, 0);
2278         if (unlikely(lfsck_is_dead_obj(child))) {
2279                 dt_read_unlock(env, child);
2280
2281                 GOTO(out, rc = 0);
2282         }
2283
2284         rc = dt_lookup(env, child, (struct dt_rec *)pfid,
2285                        (const struct dt_key *)dotdot, BYPASS_CAPA);
2286         if (rc != 0) {
2287                 if (rc != -ENOENT && rc != -ENODATA && rc != -EINVAL) {
2288                         dt_read_unlock(env, child);
2289
2290                         GOTO(out, rc);
2291                 }
2292
2293                 if (!lustre_handle_is_used(&lh)) {
2294                         dt_read_unlock(env, child);
2295                         goto lock;
2296                 }
2297
2298                 fid_zero(pfid);
2299         } else if (lfsck->li_lpf_obj != NULL &&
2300                    lu_fid_eq(pfid, lfsck_dto2fid(lfsck->li_lpf_obj))) {
2301                 lpf = true;
2302         }
2303
2304         rc = lfsck_links_read(env, child, &ldata);
2305         dt_read_unlock(env, child);
2306         if (rc != 0) {
2307                 if (rc != -ENODATA && rc != -EINVAL)
2308                         GOTO(out, rc);
2309
2310                 if (!lustre_handle_is_used(&lh))
2311                         goto lock;
2312
2313                 if (rc == -EINVAL && !fid_is_zero(pfid)) {
2314                         /* Remove the corrupted linkEA. */
2315                         rc = lfsck_namespace_links_remove(env, com, child);
2316                         if (rc == 0)
2317                                 /* Here, because of the crashed linkEA, we
2318                                  * cannot know whether there is some parent
2319                                  * that references the child directory via
2320                                  * some name entry or not. So keep it there,
2321                                  * when the LFSCK run next time, if there is
2322                                  * some parent that references this object,
2323                                  * then the LFSCK can rebuild the linkEA;
2324                                  * otherwise, this object will be handled
2325                                  * as orphan as above. */
2326                                 unknown = true;
2327                 } else {
2328                         /* 1. If we have neither ".." nor linkEA,
2329                          *    then it is an orphan.
2330                          *
2331                          * 2. If we only have the ".." name entry,
2332                          *    but no parent references this child
2333                          *    directory, then handle it as orphan. */
2334                         lfsck_ibits_unlock(&lh, LCK_EX);
2335                         type = LNIT_MUL_REF;
2336                         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2337                                  "-"DFID, PFID(pfid));
2338                         rc = lfsck_namespace_insert_orphan(env, com, child,
2339                                                 info->lti_tmpbuf, "D", NULL);
2340                 }
2341
2342                 GOTO(out, rc);
2343         }
2344
2345         linkea_first_entry(&ldata);
2346         /* This is the most common case: the object has unique linkEA entry. */
2347         if (ldata.ld_leh->leh_reccount == 1) {
2348                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, &ldata,
2349                                                 &lh, &type, &retry);
2350                 if (retry) {
2351                         LASSERT(!lustre_handle_is_used(&lh));
2352
2353                         retry = false;
2354                         goto lock;
2355                 }
2356
2357                 GOTO(out, rc);
2358         }
2359
2360         if (!lustre_handle_is_used(&lh))
2361                 goto lock;
2362
2363         if (unlikely(ldata.ld_leh->leh_reccount == 0)) {
2364                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, &lh,
2365                                                 &type);
2366
2367                 GOTO(out, rc);
2368         }
2369
2370         /* When we come here, the cases usually like that:
2371          * 1) The directory object has a corrupted linkEA entry. During the
2372          *    first-stage scanning, the LFSCK cannot know such corruption,
2373          *    then it appends the right linkEA entry according to the found
2374          *    name entry after the bad one.
2375          *
2376          * 2) The directory object has a right linkEA entry. During the
2377          *    first-stage scanning, the LFSCK finds some bad name entry,
2378          *    but the LFSCK cannot aware that at that time, then it adds
2379          *    the bad linkEA entry for further processing. */
2380         rc = lfsck_namespace_dsd_multiple(env, com, child, pfid, &ldata,
2381                                           &lh, &type, lpf);
2382
2383         GOTO(out, rc);
2384
2385 out:
2386         lfsck_ibits_unlock(&lh, LCK_EX);
2387         if (rc > 0) {
2388                 switch (type) {
2389                 case LNIT_BAD_LINKEA:
2390                         ns->ln_linkea_repaired++;
2391                         break;
2392                 case LNIT_UNMATCHED_PAIRS:
2393                         ns->ln_unmatched_pairs_repaired++;
2394                         break;
2395                 case LNIT_MUL_REF:
2396                         ns->ln_mul_ref_repaired++;
2397                         break;
2398                 default:
2399                         break;
2400                 }
2401         }
2402
2403         if (unknown)
2404                 ns->ln_unknown_inconsistency++;
2405
2406         return rc;
2407 }
2408
2409 /**
2410  * Double scan the MDT-object for namespace LFSCK.
2411  *
2412  * If the MDT-object contains invalid or repeated linkEA entries, then drop
2413  * those entries from the linkEA; if the linkEA becomes empty or the object
2414  * has no linkEA, then it is an orphan and will be added into the directory
2415  * .lustre/lost+found/MDTxxxx/; if the remote parent is lost, then recreate
2416  * the remote parent; if the name entry corresponding to some linkEA entry
2417  * is lost, then add the name entry back to the namespace.
2418  *
2419  * \param[in] env       pointer to the thread context
2420  * \param[in] com       pointer to the lfsck component
2421  * \param[in] child     pointer to the dt_object to be handled
2422  * \param[in] flags     some hints to indicate how the @child should be handled
2423  *
2424  * \retval              positive number for repaired cases
2425  * \retval              0 if nothing to be repaired
2426  * \retval              negative error number on failure
2427  */
2428 static int lfsck_namespace_double_scan_one(const struct lu_env *env,
2429                                            struct lfsck_component *com,
2430                                            struct dt_object *child, __u8 flags)
2431 {
2432         struct lfsck_thread_info *info     = lfsck_env_info(env);
2433         struct lu_attr           *la       = &info->lti_la;
2434         struct lu_name           *cname    = &info->lti_name;
2435         struct lu_fid            *pfid     = &info->lti_fid;
2436         struct lu_fid            *cfid     = &info->lti_fid2;
2437         struct lfsck_instance    *lfsck    = com->lc_lfsck;
2438         struct lfsck_namespace   *ns       = com->lc_file_ram;
2439         struct dt_object         *parent   = NULL;
2440         struct linkea_data        ldata    = { 0 };
2441         bool                      repaired = false;
2442         int                       count    = 0;
2443         int                       rc;
2444         ENTRY;
2445
2446         dt_read_lock(env, child, 0);
2447         if (unlikely(lfsck_is_dead_obj(child))) {
2448                 dt_read_unlock(env, child);
2449
2450                 RETURN(0);
2451         }
2452
2453         if (S_ISDIR(lfsck_object_type(child))) {
2454                 dt_read_unlock(env, child);
2455                 rc = lfsck_namespace_double_scan_dir(env, com, child, flags);
2456
2457                 RETURN(rc);
2458         }
2459
2460         rc = lfsck_links_read(env, child, &ldata);
2461         dt_read_unlock(env, child);
2462         if (rc != 0)
2463                 GOTO(out, rc);
2464
2465         linkea_first_entry(&ldata);
2466         while (ldata.ld_lee != NULL) {
2467                 lfsck_namespace_unpack_linkea_entry(&ldata, cname, pfid,
2468                                                     info->lti_key);
2469                 rc = lfsck_namespace_filter_linkea_entry(&ldata, cname, pfid,
2470                                                          false);
2471                 /* Found repeated linkEA entries */
2472                 if (rc > 0) {
2473                         rc = lfsck_namespace_shrink_linkea(env, com, child,
2474                                                 &ldata, cname, pfid, false);
2475                         if (rc < 0)
2476                                 GOTO(out, rc);
2477
2478                         if (rc == 0)
2479                                 continue;
2480
2481                         repaired = true;
2482
2483                         /* fall through */
2484                 }
2485
2486                 /* Invalid PFID in the linkEA entry. */
2487                 if (!fid_is_sane(pfid)) {
2488                         rc = lfsck_namespace_shrink_linkea(env, com, child,
2489                                                 &ldata, cname, pfid, true);
2490                         if (rc < 0)
2491                                 GOTO(out, rc);
2492
2493                         if (rc > 0)
2494                                 repaired = true;
2495
2496                         continue;
2497                 }
2498
2499                 parent = lfsck_object_find_bottom(env, lfsck, pfid);
2500                 if (IS_ERR(parent))
2501                         GOTO(out, rc = PTR_ERR(parent));
2502
2503                 if (!dt_object_exists(parent)) {
2504                         if (ldata.ld_leh->leh_reccount > 1) {
2505                                 /* If it is NOT the last linkEA entry, then
2506                                  * there is still other chance to make the
2507                                  * child to be visible via other parent, then
2508                                  * remove this linkEA entry. */
2509                                 rc = lfsck_namespace_shrink_linkea(env, com,
2510                                         child, &ldata, cname, pfid, true);
2511                         } else {
2512                                 /* Create the lost parent as an orphan. */
2513                                 rc = lfsck_namespace_create_orphan(env, com,
2514                                                                    parent);
2515                                 if (rc < 0) {
2516                                         lfsck_object_put(env, parent);
2517
2518                                         GOTO(out, rc);
2519                                 }
2520
2521                                 if (rc > 0)
2522                                         repaired = true;
2523
2524                                 /* Add the missing name entry to the parent. */
2525                                 rc = lfsck_namespace_insert_normal(env, com,
2526                                                 parent, child, cname->ln_name);
2527                                 if (unlikely(rc == -EEXIST))
2528                                         /* Unfortunately, someone reused the
2529                                          * name under the parent by race. So we
2530                                          * have to remove the linkEA entry from
2531                                          * current child object. It means that
2532                                          * the LFSCK cannot recover the system
2533                                          * totally back to its original status,
2534                                          * but it is necessary to make the
2535                                          * current system to be consistent. */
2536                                         rc = lfsck_namespace_shrink_linkea(env,
2537                                                         com, child, &ldata,
2538                                                         cname, pfid, true);
2539                                 else
2540                                         linkea_next_entry(&ldata);
2541                         }
2542
2543                         lfsck_object_put(env, parent);
2544                         if (rc < 0)
2545                                 GOTO(out, rc);
2546
2547                         if (rc > 0)
2548                                 repaired = true;
2549
2550                         continue;
2551                 }
2552
2553                 /* The linkEA entry with bad parent will be removed. */
2554                 if (unlikely(!dt_try_as_dir(env, parent))) {
2555                         lfsck_object_put(env, parent);
2556                         rc = lfsck_namespace_shrink_linkea(env, com, child,
2557                                                 &ldata, cname, pfid, true);
2558                         if (rc < 0)
2559                                 GOTO(out, rc);
2560
2561                         if (rc > 0)
2562                                 repaired = true;
2563
2564                         continue;
2565                 }
2566
2567                 rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
2568                                (const struct dt_key *)cname->ln_name,
2569                                BYPASS_CAPA);
2570                 if (rc != 0 && rc != -ENOENT) {
2571                         lfsck_object_put(env, parent);
2572
2573                         GOTO(out, rc);
2574                 }
2575
2576                 if (rc == 0) {
2577                         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
2578                                 /* It is the most common case that we
2579                                  * find the name entry corresponding
2580                                  * to the linkEA entry. */
2581                                 lfsck_object_put(env, parent);
2582                                 linkea_next_entry(&ldata);
2583                         } else {
2584                                 /* The name entry references another
2585                                  * MDT-object that may be created by
2586                                  * the LFSCK for repairing dangling
2587                                  * name entry. Try to replace it. */
2588                                 rc = lfsck_namespace_replace_cond(env, com,
2589                                                 parent, child, cfid, cname);
2590                                 lfsck_object_put(env, parent);
2591                                 if (rc < 0)
2592                                         GOTO(out, rc);
2593
2594                                 if (rc > 0) {
2595                                         repaired = true;
2596                                         linkea_next_entry(&ldata);
2597                                 } else {
2598                                         rc = lfsck_namespace_shrink_linkea(env,
2599                                                         com, child, &ldata,
2600                                                         cname, pfid, true);
2601                                         if (rc < 0)
2602                                                 GOTO(out, rc);
2603
2604                                         if (rc > 0)
2605                                                 repaired = true;
2606                                 }
2607                         }
2608
2609                         continue;
2610                 }
2611
2612                 rc = dt_attr_get(env, child, la, BYPASS_CAPA);
2613                 if (rc != 0)
2614                         GOTO(out, rc);
2615
2616                 /* If there is no name entry in the parent dir and the object
2617                  * link count is less than the linkea entries count, then the
2618                  * linkea entry should be removed. */
2619                 if (ldata.ld_leh->leh_reccount > la->la_nlink) {
2620                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
2621                                         parent, child, &ldata, cname, pfid);
2622                         lfsck_object_put(env, parent);
2623                         if (rc < 0)
2624                                 GOTO(out, rc);
2625
2626                         if (rc > 0)
2627                                 repaired = true;
2628
2629                         continue;
2630                 }
2631
2632                 /* Add the missing name entry back to the namespace. */
2633                 rc = lfsck_namespace_insert_normal(env, com, parent, child,
2634                                                    cname->ln_name);
2635                 if (unlikely(rc == -EEXIST))
2636                         /* Unfortunately, someone reused the name under the
2637                          * parent by race. So we have to remove the linkEA
2638                          * entry from current child object. It means that the
2639                          * LFSCK cannot recover the system totally back to
2640                          * its original status, but it is necessary to make
2641                          * the current system to be consistent.
2642                          *
2643                          * It also may be because of the LFSCK found some
2644                          * internal status of create operation. Under such
2645                          * case, nothing to be done. */
2646                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
2647                                         parent, child, &ldata, cname, pfid);
2648                 else
2649                         linkea_next_entry(&ldata);
2650
2651                 lfsck_object_put(env, parent);
2652                 if (rc < 0)
2653                         GOTO(out, rc);
2654
2655                 if (rc > 0)
2656                         repaired = true;
2657         }
2658
2659         GOTO(out, rc = 0);
2660
2661 out:
2662         if (rc < 0 && rc != -ENODATA)
2663                 return rc;
2664
2665         if (rc == 0) {
2666                 LASSERT(ldata.ld_leh != NULL);
2667
2668                 count = ldata.ld_leh->leh_reccount;
2669         }
2670
2671         if (count == 0) {
2672                 /* If the child becomes orphan, then insert it into
2673                  * the global .lustre/lost+found/MDTxxxx directory. */
2674                 rc = lfsck_namespace_insert_orphan(env, com, child, "", "O",
2675                                                    &count);
2676                 if (rc < 0)
2677                         return rc;
2678
2679                 if (rc > 0) {
2680                         ns->ln_mul_ref_repaired++;
2681                         repaired = true;
2682                 }
2683         }
2684
2685         rc = dt_attr_get(env, child, la, BYPASS_CAPA);
2686         if (rc != 0)
2687                 return rc;
2688
2689         if (la->la_nlink != count) {
2690                 /* XXX: there will be other patch(es) for MDT-object
2691                  *      hard links verification. */
2692         }
2693
2694         if (repaired) {
2695                 if (la->la_nlink > 1)
2696                         ns->ln_mul_linked_repaired++;
2697
2698                 if (rc == 0)
2699                         rc = 1;
2700         }
2701
2702         return rc;
2703 }
2704
2705 static void lfsck_namespace_dump_statistics(struct seq_file *m,
2706                                             struct lfsck_namespace *ns,
2707                                             __u64 checked_phase1,
2708                                             __u64 checked_phase2,
2709                                             __u32 time_phase1,
2710                                             __u32 time_phase2)
2711 {
2712         seq_printf(m, "checked_phase1: "LPU64"\n"
2713                       "checked_phase2: "LPU64"\n"
2714                       "updated_phase1: "LPU64"\n"
2715                       "updated_phase2: "LPU64"\n"
2716                       "failed_phase1: "LPU64"\n"
2717                       "failed_phase2: "LPU64"\n"
2718                       "directories: "LPU64"\n"
2719                       "dirent_repaired: "LPU64"\n"
2720                       "linkea_repaired: "LPU64"\n"
2721                       "nlinks_repaired: "LPU64"\n"
2722                       "multiple_linked_checked: "LPU64"\n"
2723                       "multiple_linked_repaired: "LPU64"\n"
2724                       "unknown_inconsistency: "LPU64"\n"
2725                       "unmatched_pairs_repaired: "LPU64"\n"
2726                       "dangling_repaired: "LPU64"\n"
2727                       "multiple_referenced_repaired: "LPU64"\n"
2728                       "bad_file_type_repaired: "LPU64"\n"
2729                       "lost_dirent_repaired: "LPU64"\n"
2730                       "success_count: %u\n"
2731                       "run_time_phase1: %u seconds\n"
2732                       "run_time_phase2: %u seconds\n",
2733                       checked_phase1,
2734                       checked_phase2,
2735                       ns->ln_items_repaired,
2736                       ns->ln_objs_repaired_phase2,
2737                       ns->ln_items_failed,
2738                       ns->ln_objs_failed_phase2,
2739                       ns->ln_dirs_checked,
2740                       ns->ln_dirent_repaired,
2741                       ns->ln_linkea_repaired,
2742                       ns->ln_objs_nlink_repaired,
2743                       ns->ln_mul_linked_checked,
2744                       ns->ln_mul_linked_repaired,
2745                       ns->ln_unknown_inconsistency,
2746                       ns->ln_unmatched_pairs_repaired,
2747                       ns->ln_dangling_repaired,
2748                       ns->ln_mul_ref_repaired,
2749                       ns->ln_bad_type_repaired,
2750                       ns->ln_lost_dirent_repaired,
2751                       ns->ln_success_count,
2752                       time_phase1,
2753                       time_phase2);
2754 }
2755
2756 /* namespace APIs */
2757
2758 static int lfsck_namespace_reset(const struct lu_env *env,
2759                                  struct lfsck_component *com, bool init)
2760 {
2761         struct lfsck_instance   *lfsck = com->lc_lfsck;
2762         struct lfsck_namespace  *ns    = com->lc_file_ram;
2763         struct dt_object        *root;
2764         struct dt_object        *dto;
2765         int                      rc;
2766         ENTRY;
2767
2768         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
2769         if (IS_ERR(root))
2770                 GOTO(log, rc = PTR_ERR(root));
2771
2772         if (unlikely(!dt_try_as_dir(env, root)))
2773                 GOTO(put, rc = -ENOTDIR);
2774
2775         down_write(&com->lc_sem);
2776         if (init) {
2777                 memset(ns, 0, sizeof(*ns));
2778         } else {
2779                 __u32 count = ns->ln_success_count;
2780                 __u64 last_time = ns->ln_time_last_complete;
2781
2782                 memset(ns, 0, sizeof(*ns));
2783                 ns->ln_success_count = count;
2784                 ns->ln_time_last_complete = last_time;
2785         }
2786         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
2787         ns->ln_status = LS_INIT;
2788
2789         rc = local_object_unlink(env, lfsck->li_bottom, root,
2790                                  lfsck_namespace_name);
2791         if (rc != 0)
2792                 GOTO(out, rc);
2793
2794         lfsck_object_put(env, com->lc_obj);
2795         com->lc_obj = NULL;
2796         dto = local_index_find_or_create(env, lfsck->li_los, root,
2797                                          lfsck_namespace_name,
2798                                          S_IFREG | S_IRUGO | S_IWUSR,
2799                                          &dt_lfsck_features);
2800         if (IS_ERR(dto))
2801                 GOTO(out, rc = PTR_ERR(dto));
2802
2803         com->lc_obj = dto;
2804         rc = dto->do_ops->do_index_try(env, dto, &dt_lfsck_features);
2805         if (rc != 0)
2806                 GOTO(out, rc);
2807
2808         rc = lfsck_namespace_store(env, com, true);
2809
2810         GOTO(out, rc);
2811
2812 out:
2813         up_write(&com->lc_sem);
2814
2815 put:
2816         lu_object_put(env, &root->do_lu);
2817 log:
2818         CDEBUG(D_LFSCK, "%s: namespace LFSCK reset: rc = %d\n",
2819                lfsck_lfsck2name(lfsck), rc);
2820         return rc;
2821 }
2822
2823 static void
2824 lfsck_namespace_fail(const struct lu_env *env, struct lfsck_component *com,
2825                      bool new_checked)
2826 {
2827         struct lfsck_namespace *ns = com->lc_file_ram;
2828
2829         down_write(&com->lc_sem);
2830         if (new_checked)
2831                 com->lc_new_checked++;
2832         lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
2833         up_write(&com->lc_sem);
2834 }
2835
2836 static int lfsck_namespace_checkpoint(const struct lu_env *env,
2837                                       struct lfsck_component *com, bool init)
2838 {
2839         struct lfsck_instance   *lfsck = com->lc_lfsck;
2840         struct lfsck_namespace  *ns    = com->lc_file_ram;
2841         int                      rc;
2842
2843         if (!init) {
2844                 rc = lfsck_checkpoint_generic(env, com);
2845                 if (rc != 0)
2846                         goto log;
2847         }
2848
2849         down_write(&com->lc_sem);
2850         if (init) {
2851                 ns->ln_pos_latest_start = lfsck->li_pos_checkpoint;
2852         } else {
2853                 ns->ln_pos_last_checkpoint = lfsck->li_pos_checkpoint;
2854                 ns->ln_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
2855                                 HALF_SEC - lfsck->li_time_last_checkpoint);
2856                 ns->ln_time_last_checkpoint = cfs_time_current_sec();
2857                 ns->ln_items_checked += com->lc_new_checked;
2858                 com->lc_new_checked = 0;
2859         }
2860
2861         rc = lfsck_namespace_store(env, com, false);
2862         up_write(&com->lc_sem);
2863
2864 log:
2865         CDEBUG(D_LFSCK, "%s: namespace LFSCK checkpoint at the pos ["LPU64
2866                ", "DFID", "LPX64"]: rc = %d\n", lfsck_lfsck2name(lfsck),
2867                lfsck->li_pos_current.lp_oit_cookie,
2868                PFID(&lfsck->li_pos_current.lp_dir_parent),
2869                lfsck->li_pos_current.lp_dir_cookie, rc);
2870
2871         return rc > 0 ? 0 : rc;
2872 }
2873
2874 static int lfsck_namespace_prep(const struct lu_env *env,
2875                                 struct lfsck_component *com,
2876                                 struct lfsck_start_param *lsp)
2877 {
2878         struct lfsck_instance   *lfsck  = com->lc_lfsck;
2879         struct lfsck_namespace  *ns     = com->lc_file_ram;
2880         struct lfsck_position   *pos    = &com->lc_pos_start;
2881         int                      rc;
2882
2883         if (ns->ln_status == LS_COMPLETED) {
2884                 rc = lfsck_namespace_reset(env, com, false);
2885                 if (rc == 0)
2886                         rc = lfsck_set_param(env, lfsck, lsp->lsp_start, true);
2887
2888                 if (rc != 0) {
2889                         CDEBUG(D_LFSCK, "%s: namespace LFSCK prep failed: "
2890                                "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
2891
2892                         return rc;
2893                 }
2894         }
2895
2896         down_write(&com->lc_sem);
2897         ns->ln_time_latest_start = cfs_time_current_sec();
2898         spin_lock(&lfsck->li_lock);
2899
2900         if (ns->ln_flags & LF_SCANNED_ONCE) {
2901                 if (!lfsck->li_drop_dryrun ||
2902                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
2903                         ns->ln_status = LS_SCANNING_PHASE2;
2904                         list_move_tail(&com->lc_link,
2905                                        &lfsck->li_list_double_scan);
2906                         if (!list_empty(&com->lc_link_dir))
2907                                 list_del_init(&com->lc_link_dir);
2908                         lfsck_pos_set_zero(pos);
2909                 } else {
2910                         ns->ln_status = LS_SCANNING_PHASE1;
2911                         ns->ln_run_time_phase1 = 0;
2912                         ns->ln_run_time_phase2 = 0;
2913                         ns->ln_items_checked = 0;
2914                         ns->ln_items_repaired = 0;
2915                         ns->ln_items_failed = 0;
2916                         ns->ln_dirs_checked = 0;
2917                         ns->ln_objs_checked_phase2 = 0;
2918                         ns->ln_objs_repaired_phase2 = 0;
2919                         ns->ln_objs_failed_phase2 = 0;
2920                         ns->ln_objs_nlink_repaired = 0;
2921                         ns->ln_dirent_repaired = 0;
2922                         ns->ln_linkea_repaired = 0;
2923                         ns->ln_mul_linked_checked = 0;
2924                         ns->ln_mul_linked_repaired = 0;
2925                         ns->ln_unknown_inconsistency = 0;
2926                         ns->ln_unmatched_pairs_repaired = 0;
2927                         ns->ln_dangling_repaired = 0;
2928                         ns->ln_mul_ref_repaired = 0;
2929                         ns->ln_bad_type_repaired = 0;
2930                         ns->ln_lost_dirent_repaired = 0;
2931                         fid_zero(&ns->ln_fid_latest_scanned_phase2);
2932                         if (list_empty(&com->lc_link_dir))
2933                                 list_add_tail(&com->lc_link_dir,
2934                                               &lfsck->li_list_dir);
2935                         *pos = ns->ln_pos_first_inconsistent;
2936                 }
2937         } else {
2938                 ns->ln_status = LS_SCANNING_PHASE1;
2939                 if (list_empty(&com->lc_link_dir))
2940                         list_add_tail(&com->lc_link_dir,
2941                                       &lfsck->li_list_dir);
2942                 if (!lfsck->li_drop_dryrun ||
2943                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
2944                         *pos = ns->ln_pos_last_checkpoint;
2945                         pos->lp_oit_cookie++;
2946                 } else {
2947                         *pos = ns->ln_pos_first_inconsistent;
2948                 }
2949         }
2950
2951         spin_unlock(&lfsck->li_lock);
2952         up_write(&com->lc_sem);
2953
2954         rc = lfsck_start_assistant(env, com, lsp);
2955
2956         CDEBUG(D_LFSCK, "%s: namespace LFSCK prep done, start pos ["LPU64", "
2957                DFID", "LPX64"]: rc = %d\n",
2958                lfsck_lfsck2name(lfsck), pos->lp_oit_cookie,
2959                PFID(&pos->lp_dir_parent), pos->lp_dir_cookie, rc);
2960
2961         return rc;
2962 }
2963
2964 static int lfsck_namespace_exec_oit(const struct lu_env *env,
2965                                     struct lfsck_component *com,
2966                                     struct dt_object *obj)
2967 {
2968         struct lfsck_thread_info *info  = lfsck_env_info(env);
2969         struct lfsck_namespace   *ns    = com->lc_file_ram;
2970         struct lfsck_instance    *lfsck = com->lc_lfsck;
2971         const struct lu_fid      *fid   = lfsck_dto2fid(obj);
2972         struct lu_attr           *la    = &info->lti_la;
2973         struct lu_fid            *pfid  = &info->lti_fid2;
2974         struct lu_name           *cname = &info->lti_name;
2975         struct lu_seq_range      *range = &info->lti_range;
2976         struct dt_device         *dev   = lfsck->li_bottom;
2977         struct seq_server_site   *ss    =
2978                                 lu_site2seq(dev->dd_lu_dev.ld_site);
2979         struct linkea_data        ldata = { 0 };
2980         __u32                     idx   = lfsck_dev_idx(dev);
2981         int                       rc;
2982         ENTRY;
2983
2984         rc = lfsck_links_read(env, obj, &ldata);
2985         if (rc == -ENOENT)
2986                 GOTO(out, rc = 0);
2987
2988         /* -EINVAL means crashed linkEA, should be verified. */
2989         if (rc == -EINVAL) {
2990                 rc = lfsck_namespace_trace_update(env, com, fid,
2991                                                   LNTF_CHECK_LINKEA, true);
2992                 if (rc == 0) {
2993                         struct lustre_handle lh = { 0 };
2994
2995                         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
2996                                               MDS_INODELOCK_UPDATE |
2997                                               MDS_INODELOCK_XATTR, LCK_EX);
2998                         if (rc == 0) {
2999                                 rc = lfsck_namespace_links_remove(env, com,
3000                                                                   obj);
3001                                 lfsck_ibits_unlock(&lh, LCK_EX);
3002                         }
3003                 }
3004
3005                 GOTO(out, rc = (rc == -ENOENT ? 0 : rc));
3006         }
3007
3008         /* zero-linkEA object may be orphan, but it also maybe because
3009          * of upgrading. Currently, we cannot record it for double scan.
3010          * Because it may cause the LFSCK tracing file to be too large. */
3011         if (rc == -ENODATA) {
3012                 if (S_ISDIR(lfsck_object_type(obj)))
3013                         GOTO(out, rc = 0);
3014
3015                 rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
3016                 if (rc != 0)
3017                         GOTO(out, rc);
3018
3019                 if (la->la_nlink > 1)
3020                         rc = lfsck_namespace_trace_update(env, com, fid,
3021                                                 LNTF_CHECK_LINKEA, true);
3022
3023                 GOTO(out, rc);
3024         }
3025
3026         if (rc != 0)
3027                 GOTO(out, rc);
3028
3029         /* Record multiple-linked object. */
3030         if (ldata.ld_leh->leh_reccount > 1) {
3031                 rc = lfsck_namespace_trace_update(env, com, fid,
3032                                                   LNTF_CHECK_LINKEA, true);
3033
3034                 GOTO(out, rc);
3035         }
3036
3037         linkea_first_entry(&ldata);
3038         linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen, cname, pfid);
3039         if (!fid_is_sane(pfid)) {
3040                 rc = lfsck_namespace_trace_update(env, com, fid,
3041                                                   LNTF_CHECK_PARENT, true);
3042         } else {
3043                 fld_range_set_mdt(range);
3044                 rc = fld_local_lookup(env, ss->ss_server_fld,
3045                                       fid_seq(pfid), range);
3046                 if ((rc == -ENOENT) ||
3047                     (rc == 0 && range->lsr_index != idx)) {
3048                         rc = lfsck_namespace_trace_update(env, com, fid,
3049                                                 LNTF_CHECK_LINKEA, true);
3050                 } else {
3051                         if (S_ISDIR(lfsck_object_type(obj)))
3052                                 GOTO(out, rc = 0);
3053
3054                         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
3055                         if (rc != 0)
3056                                 GOTO(out, rc);
3057
3058                         if (la->la_nlink > 1)
3059                                 rc = lfsck_namespace_trace_update(env, com,
3060                                                 fid, LNTF_CHECK_LINKEA, true);
3061                 }
3062         }
3063
3064         GOTO(out, rc);
3065
3066 out:
3067         down_write(&com->lc_sem);
3068         com->lc_new_checked++;
3069         if (S_ISDIR(lfsck_object_type(obj)))
3070                 ns->ln_dirs_checked++;
3071         if (rc != 0)
3072                 lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
3073         up_write(&com->lc_sem);
3074
3075         return rc;
3076 }
3077
3078 static int lfsck_namespace_exec_dir(const struct lu_env *env,
3079                                     struct lfsck_component *com,
3080                                     struct lu_dirent *ent, __u16 type)
3081 {
3082         struct lfsck_assistant_data     *lad    = com->lc_data;
3083         struct lfsck_namespace_req      *lnr;
3084         bool                             wakeup = false;
3085
3086         lnr = lfsck_namespace_assistant_req_init(com->lc_lfsck, ent, type);
3087         if (IS_ERR(lnr)) {
3088                 struct lfsck_namespace *ns = com->lc_file_ram;
3089
3090                 lfsck_namespace_record_failure(env, com->lc_lfsck, ns);
3091                 return PTR_ERR(lnr);
3092         }
3093
3094         spin_lock(&lad->lad_lock);
3095         if (lad->lad_assistant_status < 0) {
3096                 spin_unlock(&lad->lad_lock);
3097                 lfsck_namespace_assistant_req_fini(env, &lnr->lnr_lar);
3098                 return lad->lad_assistant_status;
3099         }
3100
3101         list_add_tail(&lnr->lnr_lar.lar_list, &lad->lad_req_list);
3102         if (lad->lad_prefetched == 0)
3103                 wakeup = true;
3104
3105         lad->lad_prefetched++;
3106         spin_unlock(&lad->lad_lock);
3107         if (wakeup)
3108                 wake_up_all(&lad->lad_thread.t_ctl_waitq);
3109
3110         down_write(&com->lc_sem);
3111         com->lc_new_checked++;
3112         up_write(&com->lc_sem);
3113
3114         return 0;
3115 }
3116
3117 static int lfsck_namespace_post(const struct lu_env *env,
3118                                 struct lfsck_component *com,
3119                                 int result, bool init)
3120 {
3121         struct lfsck_instance   *lfsck = com->lc_lfsck;
3122         struct lfsck_namespace  *ns    = com->lc_file_ram;
3123         int                      rc;
3124         ENTRY;
3125
3126         lfsck_post_generic(env, com, &result);
3127
3128         down_write(&com->lc_sem);
3129         spin_lock(&lfsck->li_lock);
3130         if (!init)
3131                 ns->ln_pos_last_checkpoint = lfsck->li_pos_checkpoint;
3132         if (result > 0) {
3133                 ns->ln_status = LS_SCANNING_PHASE2;
3134                 ns->ln_flags |= LF_SCANNED_ONCE;
3135                 ns->ln_flags &= ~LF_UPGRADE;
3136                 list_del_init(&com->lc_link_dir);
3137                 list_move_tail(&com->lc_link, &lfsck->li_list_double_scan);
3138         } else if (result == 0) {
3139                 ns->ln_status = lfsck->li_status;
3140                 if (ns->ln_status == 0)
3141                         ns->ln_status = LS_STOPPED;
3142                 if (ns->ln_status != LS_PAUSED) {
3143                         list_del_init(&com->lc_link_dir);
3144                         list_move_tail(&com->lc_link, &lfsck->li_list_idle);
3145                 }
3146         } else {
3147                 ns->ln_status = LS_FAILED;
3148                 list_del_init(&com->lc_link_dir);
3149                 list_move_tail(&com->lc_link, &lfsck->li_list_idle);
3150         }
3151         spin_unlock(&lfsck->li_lock);
3152
3153         if (!init) {
3154                 ns->ln_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
3155                                 HALF_SEC - lfsck->li_time_last_checkpoint);
3156                 ns->ln_time_last_checkpoint = cfs_time_current_sec();
3157                 ns->ln_items_checked += com->lc_new_checked;
3158                 com->lc_new_checked = 0;
3159         }
3160
3161         rc = lfsck_namespace_store(env, com, false);
3162         up_write(&com->lc_sem);
3163
3164         CDEBUG(D_LFSCK, "%s: namespace LFSCK post done: rc = %d\n",
3165                lfsck_lfsck2name(lfsck), rc);
3166
3167         RETURN(rc);
3168 }
3169
3170 static int
3171 lfsck_namespace_dump(const struct lu_env *env, struct lfsck_component *com,
3172                      struct seq_file *m)
3173 {
3174         struct lfsck_instance   *lfsck = com->lc_lfsck;
3175         struct lfsck_bookmark   *bk    = &lfsck->li_bookmark_ram;
3176         struct lfsck_namespace  *ns    = com->lc_file_ram;
3177         int                      rc;
3178
3179         down_read(&com->lc_sem);
3180         seq_printf(m, "name: lfsck_namespace\n"
3181                    "magic: %#x\n"
3182                    "version: %d\n"
3183                    "status: %s\n",
3184                    ns->ln_magic,
3185                    bk->lb_version,
3186                    lfsck_status2names(ns->ln_status));
3187
3188         rc = lfsck_bits_dump(m, ns->ln_flags, lfsck_flags_names, "flags");
3189         if (rc < 0)
3190                 goto out;
3191
3192         rc = lfsck_bits_dump(m, bk->lb_param, lfsck_param_names, "param");
3193         if (rc < 0)
3194                 goto out;
3195
3196         rc = lfsck_time_dump(m, ns->ln_time_last_complete,
3197                              "time_since_last_completed");
3198         if (rc < 0)
3199                 goto out;
3200
3201         rc = lfsck_time_dump(m, ns->ln_time_latest_start,
3202                              "time_since_latest_start");
3203         if (rc < 0)
3204                 goto out;
3205
3206         rc = lfsck_time_dump(m, ns->ln_time_last_checkpoint,
3207                              "time_since_last_checkpoint");
3208         if (rc < 0)
3209                 goto out;
3210
3211         rc = lfsck_pos_dump(m, &ns->ln_pos_latest_start,
3212                             "latest_start_position");
3213         if (rc < 0)
3214                 goto out;
3215
3216         rc = lfsck_pos_dump(m, &ns->ln_pos_last_checkpoint,
3217                             "last_checkpoint_position");
3218         if (rc < 0)
3219                 goto out;
3220
3221         rc = lfsck_pos_dump(m, &ns->ln_pos_first_inconsistent,
3222                             "first_failure_position");
3223         if (rc < 0)
3224                 goto out;
3225
3226         if (ns->ln_status == LS_SCANNING_PHASE1) {
3227                 struct lfsck_position pos;
3228                 const struct dt_it_ops *iops;
3229                 cfs_duration_t duration = cfs_time_current() -
3230                                           lfsck->li_time_last_checkpoint;
3231                 __u64 checked = ns->ln_items_checked + com->lc_new_checked;
3232                 __u64 speed = checked;
3233                 __u64 new_checked = com->lc_new_checked * HZ;
3234                 __u32 rtime = ns->ln_run_time_phase1 +
3235                               cfs_duration_sec(duration + HALF_SEC);
3236
3237                 if (duration != 0)
3238                         do_div(new_checked, duration);
3239                 if (rtime != 0)
3240                         do_div(speed, rtime);
3241                 lfsck_namespace_dump_statistics(m, ns, checked,
3242                                                 ns->ln_objs_checked_phase2,
3243                                                 rtime, ns->ln_run_time_phase2);
3244
3245                 seq_printf(m, "average_speed_phase1: "LPU64" items/sec\n"
3246                               "average_speed_phase2: N/A\n"
3247                               "real_time_speed_phase1: "LPU64" items/sec\n"
3248                               "real_time_speed_phase2: N/A\n",
3249                               speed,
3250                               new_checked);
3251
3252                 LASSERT(lfsck->li_di_oit != NULL);
3253
3254                 iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
3255
3256                 /* The low layer otable-based iteration position may NOT
3257                  * exactly match the namespace-based directory traversal
3258                  * cookie. Generally, it is not a serious issue. But the
3259                  * caller should NOT make assumption on that. */
3260                 pos.lp_oit_cookie = iops->store(env, lfsck->li_di_oit);
3261                 if (!lfsck->li_current_oit_processed)
3262                         pos.lp_oit_cookie--;
3263
3264                 spin_lock(&lfsck->li_lock);
3265                 if (lfsck->li_di_dir != NULL) {
3266                         pos.lp_dir_cookie = lfsck->li_cookie_dir;
3267                         if (pos.lp_dir_cookie >= MDS_DIR_END_OFF) {
3268                                 fid_zero(&pos.lp_dir_parent);
3269                                 pos.lp_dir_cookie = 0;
3270                         } else {
3271                                 pos.lp_dir_parent =
3272                                         *lfsck_dto2fid(lfsck->li_obj_dir);
3273                         }
3274                 } else {
3275                         fid_zero(&pos.lp_dir_parent);
3276                         pos.lp_dir_cookie = 0;
3277                 }
3278                 spin_unlock(&lfsck->li_lock);
3279                 lfsck_pos_dump(m, &pos, "current_position");
3280         } else if (ns->ln_status == LS_SCANNING_PHASE2) {
3281                 cfs_duration_t duration = cfs_time_current() -
3282                                           lfsck->li_time_last_checkpoint;
3283                 __u64 checked = ns->ln_objs_checked_phase2 +
3284                                 com->lc_new_checked;
3285                 __u64 speed1 = ns->ln_items_checked;
3286                 __u64 speed2 = checked;
3287                 __u64 new_checked = com->lc_new_checked * HZ;
3288                 __u32 rtime = ns->ln_run_time_phase2 +
3289                               cfs_duration_sec(duration + HALF_SEC);
3290
3291                 if (duration != 0)
3292                         do_div(new_checked, duration);
3293                 if (ns->ln_run_time_phase1 != 0)
3294                         do_div(speed1, ns->ln_run_time_phase1);
3295                 if (rtime != 0)
3296                         do_div(speed2, rtime);
3297                 lfsck_namespace_dump_statistics(m, ns, ns->ln_items_checked,
3298                                                 checked,
3299                                                 ns->ln_run_time_phase1, rtime);
3300
3301                 seq_printf(m, "average_speed_phase1: "LPU64" items/sec\n"
3302                               "average_speed_phase2: "LPU64" objs/sec\n"
3303                               "real_time_speed_phase1: N/A\n"
3304                               "real_time_speed_phase2: "LPU64" objs/sec\n"
3305                               "current_position: "DFID"\n",
3306                               speed1,
3307                               speed2,
3308                               new_checked,
3309                               PFID(&ns->ln_fid_latest_scanned_phase2));
3310         } else {
3311                 __u64 speed1 = ns->ln_items_checked;
3312                 __u64 speed2 = ns->ln_objs_checked_phase2;
3313
3314                 if (ns->ln_run_time_phase1 != 0)
3315                         do_div(speed1, ns->ln_run_time_phase1);
3316                 if (ns->ln_run_time_phase2 != 0)
3317                         do_div(speed2, ns->ln_run_time_phase2);
3318                 lfsck_namespace_dump_statistics(m, ns, ns->ln_items_checked,
3319                                                 ns->ln_objs_checked_phase2,
3320                                                 ns->ln_run_time_phase1,
3321                                                 ns->ln_run_time_phase2);
3322
3323                 seq_printf(m, "average_speed_phase1: "LPU64" items/sec\n"
3324                               "average_speed_phase2: "LPU64" objs/sec\n"
3325                               "real_time_speed_phase1: N/A\n"
3326                               "real_time_speed_phase2: N/A\n"
3327                               "current_position: N/A\n",
3328                               speed1,
3329                               speed2);
3330         }
3331 out:
3332         up_read(&com->lc_sem);
3333         return 0;
3334 }
3335
3336 static int lfsck_namespace_double_scan(const struct lu_env *env,
3337                                        struct lfsck_component *com)
3338 {
3339         struct lfsck_namespace *ns = com->lc_file_ram;
3340
3341         return lfsck_double_scan_generic(env, com, ns->ln_status);
3342 }
3343
3344 static void lfsck_namespace_data_release(const struct lu_env *env,
3345                                          struct lfsck_component *com)
3346 {
3347         struct lfsck_assistant_data     *lad    = com->lc_data;
3348         struct lfsck_tgt_descs          *ltds   = &com->lc_lfsck->li_mdt_descs;
3349         struct lfsck_tgt_desc           *ltd;
3350         struct lfsck_tgt_desc           *next;
3351
3352         LASSERT(lad != NULL);
3353         LASSERT(thread_is_init(&lad->lad_thread) ||
3354                 thread_is_stopped(&lad->lad_thread));
3355         LASSERT(list_empty(&lad->lad_req_list));
3356
3357         com->lc_data = NULL;
3358
3359         spin_lock(&ltds->ltd_lock);
3360         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase1_list,
3361                                  ltd_namespace_phase_list) {
3362                 list_del_init(&ltd->ltd_namespace_phase_list);
3363         }
3364         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_phase2_list,
3365                                  ltd_namespace_phase_list) {
3366                 list_del_init(&ltd->ltd_namespace_phase_list);
3367         }
3368         list_for_each_entry_safe(ltd, next, &lad->lad_mdt_list,
3369                                  ltd_namespace_list) {
3370                 list_del_init(&ltd->ltd_namespace_list);
3371         }
3372         spin_unlock(&ltds->ltd_lock);
3373
3374         CFS_FREE_BITMAP(lad->lad_bitmap);
3375
3376         OBD_FREE_PTR(lad);
3377 }
3378
3379 static int lfsck_namespace_in_notify(const struct lu_env *env,
3380                                      struct lfsck_component *com,
3381                                      struct lfsck_request *lr)
3382 {
3383         struct lfsck_instance           *lfsck = com->lc_lfsck;
3384         struct lfsck_namespace          *ns    = com->lc_file_ram;
3385         struct lfsck_assistant_data     *lad   = com->lc_data;
3386         struct lfsck_tgt_descs          *ltds  = &lfsck->li_mdt_descs;
3387         struct lfsck_tgt_desc           *ltd;
3388         bool                             fail  = false;
3389         ENTRY;
3390
3391         if (lr->lr_event != LE_PHASE1_DONE &&
3392             lr->lr_event != LE_PHASE2_DONE &&
3393             lr->lr_event != LE_PEER_EXIT)
3394                 RETURN(-EINVAL);
3395
3396         CDEBUG(D_LFSCK, "%s: namespace LFSCK handles notify %u from MDT %x, "
3397                "status %d\n", lfsck_lfsck2name(lfsck), lr->lr_event,
3398                lr->lr_index, lr->lr_status);
3399
3400         spin_lock(&ltds->ltd_lock);
3401         ltd = LTD_TGT(ltds, lr->lr_index);
3402         if (ltd == NULL) {
3403                 spin_unlock(&ltds->ltd_lock);
3404
3405                 RETURN(-ENXIO);
3406         }
3407
3408         list_del_init(&ltd->ltd_namespace_phase_list);
3409         switch (lr->lr_event) {
3410         case LE_PHASE1_DONE:
3411                 if (lr->lr_status <= 0) {
3412                         ltd->ltd_namespace_done = 1;
3413                         list_del_init(&ltd->ltd_namespace_list);
3414                         CDEBUG(D_LFSCK, "%s: MDT %x failed/stopped at "
3415                                "phase1 for namespace LFSCK: rc = %d.\n",
3416                                lfsck_lfsck2name(lfsck),
3417                                ltd->ltd_index, lr->lr_status);
3418                         ns->ln_flags |= LF_INCOMPLETE;
3419                         fail = true;
3420                         break;
3421                 }
3422
3423                 if (list_empty(&ltd->ltd_namespace_list))
3424                         list_add_tail(&ltd->ltd_namespace_list,
3425                                       &lad->lad_mdt_list);
3426                 list_add_tail(&ltd->ltd_namespace_phase_list,
3427                               &lad->lad_mdt_phase2_list);
3428                 break;
3429         case LE_PHASE2_DONE:
3430                 ltd->ltd_namespace_done = 1;
3431                 list_del_init(&ltd->ltd_namespace_list);
3432                 break;
3433         case LE_PEER_EXIT:
3434                 fail = true;
3435                 ltd->ltd_namespace_done = 1;
3436                 list_del_init(&ltd->ltd_namespace_list);
3437                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT)) {
3438                         CDEBUG(D_LFSCK,
3439                                "%s: the peer MDT %x exit namespace LFSCK\n",
3440                                lfsck_lfsck2name(lfsck), ltd->ltd_index);
3441                         ns->ln_flags |= LF_INCOMPLETE;
3442                 }
3443                 break;
3444         default:
3445                 break;
3446         }
3447         spin_unlock(&ltds->ltd_lock);
3448
3449         if (fail && lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT) {
3450                 struct lfsck_stop *stop = &lfsck_env_info(env)->lti_stop;
3451
3452                 memset(stop, 0, sizeof(*stop));
3453                 stop->ls_status = lr->lr_status;
3454                 stop->ls_flags = lr->lr_param & ~LPF_BROADCAST;
3455                 lfsck_stop(env, lfsck->li_bottom, stop);
3456         } else if (lfsck_phase2_next_ready(lad)) {
3457                 wake_up_all(&lad->lad_thread.t_ctl_waitq);
3458         }
3459
3460         RETURN(0);
3461 }
3462
3463 static int lfsck_namespace_query(const struct lu_env *env,
3464                                  struct lfsck_component *com)
3465 {
3466         struct lfsck_namespace *ns = com->lc_file_ram;
3467
3468         return ns->ln_status;
3469 }
3470
3471 static struct lfsck_operations lfsck_namespace_ops = {
3472         .lfsck_reset            = lfsck_namespace_reset,
3473         .lfsck_fail             = lfsck_namespace_fail,
3474         .lfsck_checkpoint       = lfsck_namespace_checkpoint,
3475         .lfsck_prep             = lfsck_namespace_prep,
3476         .lfsck_exec_oit         = lfsck_namespace_exec_oit,
3477         .lfsck_exec_dir         = lfsck_namespace_exec_dir,
3478         .lfsck_post             = lfsck_namespace_post,
3479         .lfsck_dump             = lfsck_namespace_dump,
3480         .lfsck_double_scan      = lfsck_namespace_double_scan,
3481         .lfsck_data_release     = lfsck_namespace_data_release,
3482         .lfsck_quit             = lfsck_quit_generic,
3483         .lfsck_in_notify        = lfsck_namespace_in_notify,
3484         .lfsck_query            = lfsck_namespace_query,
3485 };
3486
3487 /**
3488  * Repair dangling name entry.
3489  *
3490  * For the name entry with dangling reference, we need to repare the
3491  * inconsistency according to the LFSCK sponsor's requirement:
3492  *
3493  * 1) Keep the inconsistency there and report the inconsistency case,
3494  *    then give the chance to the application to find related issues,
3495  *    and the users can make the decision about how to handle it with
3496  *    more human knownledge. (by default)
3497  *
3498  * 2) Re-create the missed MDT-object with the FID information.
3499  *
3500  * \param[in] env       pointer to the thread context
3501  * \param[in] com       pointer to the lfsck component
3502  * \param[in] child     pointer to the object corresponding to the dangling
3503  *                      name entry
3504  * \param[in] lnr       pointer to the namespace request that contains the
3505  *                      name's name, parent object, parent's LMV, and ect.
3506  *
3507  * \retval              positive number if no need to repair
3508  * \retval              zero for repaired successfully
3509  * \retval              negative error number on failure
3510  */
3511 int lfsck_namespace_repair_dangling(const struct lu_env *env,
3512                                     struct lfsck_component *com,
3513                                     struct dt_object *child,
3514                                     struct lfsck_namespace_req *lnr)
3515 {
3516         struct lfsck_thread_info        *info   = lfsck_env_info(env);
3517         struct lu_attr                  *la     = &info->lti_la;
3518         struct dt_allocation_hint       *hint   = &info->lti_hint;
3519         struct dt_object_format         *dof    = &info->lti_dof;
3520         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
3521         struct dt_object                *parent = lnr->lnr_obj;
3522         const struct lu_name            *cname;
3523         struct linkea_data               ldata  = { 0 };
3524         struct lustre_handle             lh     = { 0 };
3525         struct lu_buf                    linkea_buf;
3526         struct lfsck_instance           *lfsck  = com->lc_lfsck;
3527         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
3528         struct dt_device                *dev    = lfsck_obj2dt_dev(child);
3529         struct thandle                  *th     = NULL;
3530         int                              rc     = 0;
3531         __u16                            type   = lnr->lnr_type;
3532         bool                             create;
3533         ENTRY;
3534
3535         cname = lfsck_name_get_const(env, lnr->lnr_name, lnr->lnr_namelen);
3536         if (bk->lb_param & LPF_CREATE_MDTOBJ)
3537                 create = true;
3538         else
3539                 create = false;
3540
3541         if (!create || bk->lb_param & LPF_DRYRUN)
3542                 GOTO(log, rc = 0);
3543
3544         rc = linkea_data_new(&ldata, &info->lti_linkea_buf2);
3545         if (rc != 0)
3546                 GOTO(log, rc);
3547
3548         rc = linkea_add_buf(&ldata, cname, lfsck_dto2fid(parent));
3549         if (rc != 0)
3550                 GOTO(log, rc);
3551
3552         rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
3553                               MDS_INODELOCK_UPDATE, LCK_EX);
3554         if (rc != 0)
3555                 GOTO(log, rc);
3556
3557         rc = lfsck_namespace_check_exist(env, parent, child, lnr->lnr_name);
3558         if (rc != 0)
3559                 GOTO(log, rc);
3560
3561         th = dt_trans_create(env, dev);
3562         if (IS_ERR(th))
3563                 GOTO(log, rc = PTR_ERR(th));
3564
3565         /* Set the ctime as zero, then others can know it is created for
3566          * repairing dangling name entry by LFSCK. And if the LFSCK made
3567          * wrong decision and the real MDT-object has been found later,
3568          * then the LFSCK has chance to fix the incosistency properly. */
3569         memset(la, 0, sizeof(*la));
3570         la->la_mode = (type & S_IFMT) | 0600;
3571         la->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
3572                         LA_ATIME | LA_MTIME | LA_CTIME;
3573
3574         child->do_ops->do_ah_init(env, hint, parent, child,
3575                                   la->la_mode & S_IFMT);
3576
3577         memset(dof, 0, sizeof(*dof));
3578         dof->dof_type = dt_mode_to_dft(type);
3579         /* If the target is a regular file, then the LFSCK will only create
3580          * the MDT-object without stripes (dof->dof_reg.striped = 0). related
3581          * OST-objects will be created when write open. */
3582
3583         /* 1a. create child. */
3584         rc = dt_declare_create(env, child, la, hint, dof, th);
3585         if (rc != 0)
3586                 GOTO(stop, rc);
3587
3588         if (S_ISDIR(type)) {
3589                 if (unlikely(!dt_try_as_dir(env, child)))
3590                         GOTO(stop, rc = -ENOTDIR);
3591
3592                 /* 2a. insert dot into child dir */
3593                 rec->rec_type = S_IFDIR;
3594                 rec->rec_fid = lfsck_dto2fid(child);
3595                 rc = dt_declare_insert(env, child,
3596                                        (const struct dt_rec *)rec,
3597                                        (const struct dt_key *)dot, th);
3598                 if (rc != 0)
3599                         GOTO(stop, rc);
3600
3601                 /* 3a. insert dotdot into child dir */
3602                 rec->rec_fid = lfsck_dto2fid(parent);
3603                 rc = dt_declare_insert(env, child,
3604                                        (const struct dt_rec *)rec,
3605                                        (const struct dt_key *)dotdot, th);
3606                 if (rc != 0)
3607                         GOTO(stop, rc);
3608
3609                 /* 4a. increase child nlink */
3610                 rc = dt_declare_ref_add(env, child, th);
3611                 if (rc != 0)
3612                         GOTO(stop, rc);
3613         }
3614
3615         /* 5a. insert linkEA for child */
3616         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
3617                        ldata.ld_leh->leh_len);
3618         rc = dt_declare_xattr_set(env, child, &linkea_buf,
3619                                   XATTR_NAME_LINK, 0, th);
3620         if (rc != 0)
3621                 GOTO(stop, rc);
3622
3623         rc = dt_trans_start(env, dev, th);
3624         if (rc != 0)
3625                 GOTO(stop, rc = (rc == -EEXIST ? 1 : rc));
3626
3627         dt_write_lock(env, child, 0);
3628         /* 1b. create child */
3629         rc = dt_create(env, child, la, hint, dof, th);
3630         if (rc != 0)
3631                 GOTO(unlock, rc = (rc == -EEXIST ? 1 : rc));
3632
3633         if (S_ISDIR(type)) {
3634                 if (unlikely(!dt_try_as_dir(env, child)))
3635                         GOTO(unlock, rc = -ENOTDIR);
3636
3637                 /* 2b. insert dot into child dir */
3638                 rec->rec_type = S_IFDIR;
3639                 rec->rec_fid = lfsck_dto2fid(child);
3640                 rc = dt_insert(env, child, (const struct dt_rec *)rec,
3641                                (const struct dt_key *)dot, th, BYPASS_CAPA, 1);
3642                 if (rc != 0)
3643                         GOTO(unlock, rc);
3644
3645                 /* 3b. insert dotdot into child dir */
3646                 rec->rec_fid = lfsck_dto2fid(parent);
3647                 rc = dt_insert(env, child, (const struct dt_rec *)rec,
3648                                (const struct dt_key *)dotdot, th,
3649                                BYPASS_CAPA, 1);
3650                 if (rc != 0)
3651                         GOTO(unlock, rc);
3652
3653                 /* 4b. increase child nlink */
3654                 rc = dt_ref_add(env, child, th);
3655                 if (rc != 0)
3656                         GOTO(unlock, rc);
3657         }
3658
3659         /* 5b. insert linkEA for child. */
3660         rc = dt_xattr_set(env, child, &linkea_buf,
3661                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
3662
3663         GOTO(unlock, rc);
3664
3665 unlock:
3666         dt_write_unlock(env, child);
3667
3668 stop:
3669         dt_trans_stop(env, dev, th);
3670
3671 log:
3672         lfsck_ibits_unlock(&lh, LCK_EX);
3673         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found dangling "
3674                "reference for: parent "DFID", child "DFID", type %u, "
3675                "name %s. %s: rc = %d\n", lfsck_lfsck2name(lfsck),
3676                PFID(lfsck_dto2fid(parent)), PFID(lfsck_dto2fid(child)),
3677                type, cname->ln_name,
3678                create ? "Create the lost OST-object as required" :
3679                         "Keep the MDT-object there by default", rc);
3680
3681         if (rc <= 0) {
3682                 struct lfsck_namespace *ns = com->lc_file_ram;
3683
3684                 ns->ln_flags |= LF_INCONSISTENT;
3685         }
3686
3687         return rc;
3688 }
3689
3690 static int lfsck_namespace_assistant_handler_p1(const struct lu_env *env,
3691                                                 struct lfsck_component *com,
3692                                                 struct lfsck_assistant_req *lar)
3693 {
3694         struct lfsck_thread_info   *info     = lfsck_env_info(env);
3695         struct lu_attr             *la       = &info->lti_la;
3696         struct lfsck_instance      *lfsck    = com->lc_lfsck;
3697         struct lfsck_bookmark      *bk       = &lfsck->li_bookmark_ram;
3698         struct lfsck_namespace     *ns       = com->lc_file_ram;
3699         struct linkea_data          ldata    = { 0 };
3700         const struct lu_name       *cname;
3701         struct thandle             *handle   = NULL;
3702         struct lfsck_namespace_req *lnr      =
3703                         container_of0(lar, struct lfsck_namespace_req, lnr_lar);
3704         struct dt_object           *dir      = lnr->lnr_obj;
3705         struct dt_object           *obj      = NULL;
3706         const struct lu_fid        *pfid     = lfsck_dto2fid(dir);
3707         struct dt_device           *dev;
3708         struct lustre_handle        lh       = { 0 };
3709         bool                        repaired = false;
3710         bool                        dtlocked = false;
3711         bool                        remove;
3712         bool                        newdata;
3713         bool                        log      = false;
3714         int                         idx;
3715         int                         count    = 0;
3716         int                         rc;
3717         enum lfsck_namespace_inconsistency_type type = LNIT_NONE;
3718         ENTRY;
3719
3720         if (lnr->lnr_attr & LUDA_UPGRADE) {
3721                 ns->ln_flags |= LF_UPGRADE;
3722                 ns->ln_dirent_repaired++;
3723                 repaired = true;
3724         } else if (lnr->lnr_attr & LUDA_REPAIR) {
3725                 ns->ln_flags |= LF_INCONSISTENT;
3726                 ns->ln_dirent_repaired++;
3727                 repaired = true;
3728         }
3729
3730         if (unlikely(fid_is_zero(&lnr->lnr_fid))) {
3731                 if (strcmp(lnr->lnr_name, dotdot) != 0)
3732                         LBUG();
3733                 else
3734                         rc = lfsck_namespace_trace_update(env, com, pfid,
3735                                                 LNTF_CHECK_PARENT, true);
3736
3737                 GOTO(out, rc);
3738         }
3739
3740         if (lnr->lnr_name[0] == '.' &&
3741             (lnr->lnr_namelen == 1 || fid_seq_is_dot(fid_seq(&lnr->lnr_fid))))
3742                 GOTO(out, rc = 0);
3743
3744         idx = lfsck_find_mdt_idx_by_fid(env, lfsck, &lnr->lnr_fid);
3745         if (idx < 0)
3746                 GOTO(out, rc = idx);
3747
3748         if (idx == lfsck_dev_idx(lfsck->li_bottom)) {
3749                 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0))
3750                         GOTO(out, rc = 0);
3751
3752                 dev = lfsck->li_next;
3753         } else {
3754                 struct lfsck_tgt_desc *ltd;
3755
3756                 /* Usually, some local filesystem consistency verification
3757                  * tools can guarantee the local namespace tree consistenct.
3758                  * So the LFSCK will only verify the remote directory. */
3759                 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0)) {
3760                         rc = lfsck_namespace_trace_update(env, com, pfid,
3761                                                 LNTF_CHECK_PARENT, true);
3762
3763                         GOTO(out, rc);
3764                 }
3765
3766                 ltd = LTD_TGT(&lfsck->li_mdt_descs, idx);
3767                 if (unlikely(ltd == NULL)) {
3768                         CDEBUG(D_LFSCK, "%s: cannot talk with MDT %x which "
3769                                "did not join the namespace LFSCK\n",
3770                                lfsck_lfsck2name(lfsck), idx);
3771                         ns->ln_flags |= LF_INCOMPLETE;
3772
3773                         GOTO(out, rc = -ENODEV);
3774                 }
3775
3776                 dev = ltd->ltd_tgt;
3777         }
3778
3779         obj = lfsck_object_find_by_dev(env, dev, &lnr->lnr_fid);
3780         if (IS_ERR(obj))
3781                 GOTO(out, rc = PTR_ERR(obj));
3782
3783         cname = lfsck_name_get_const(env, lnr->lnr_name, lnr->lnr_namelen);
3784         if (dt_object_exists(obj) == 0) {
3785
3786 dangling:
3787                 rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
3788                 if (rc == 0) {
3789                         type = LNIT_DANGLING;
3790                         rc = lfsck_namespace_repair_dangling(env, com,
3791                                                              obj, lnr);
3792                         if (rc == 0)
3793                                 repaired = true;
3794                 }
3795
3796                 GOTO(out, rc);
3797         }
3798
3799         if (!(bk->lb_param & LPF_DRYRUN) && repaired) {
3800
3801 again:
3802                 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
3803                                       MDS_INODELOCK_UPDATE |
3804                                       MDS_INODELOCK_XATTR, LCK_EX);
3805                 if (rc != 0)
3806                         GOTO(out, rc);
3807
3808                 handle = dt_trans_create(env, dev);
3809                 if (IS_ERR(handle))
3810                         GOTO(out, rc = PTR_ERR(handle));
3811
3812                 rc = lfsck_declare_namespace_exec_dir(env, obj, handle);
3813                 if (rc != 0)
3814                         GOTO(stop, rc);
3815
3816                 rc = dt_trans_start(env, dev, handle);
3817                 if (rc != 0)
3818                         GOTO(stop, rc);
3819
3820                 dt_write_lock(env, obj, 0);
3821                 dtlocked = true;
3822         }
3823
3824         rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
3825         if (rc != 0)
3826                 GOTO(stop, rc);
3827
3828         rc = lfsck_links_read(env, obj, &ldata);
3829         if (unlikely(rc == -ENOENT)) {
3830                 if (handle != NULL) {
3831                         dt_write_unlock(env, obj);
3832                         dtlocked = false;
3833
3834                         dt_trans_stop(env, dev, handle);
3835                         handle = NULL;
3836
3837                         lfsck_ibits_unlock(&lh, LCK_EX);
3838                 }
3839
3840                 /* It may happen when the remote object has been removed,
3841                  * but the local MDT is not aware of that. */
3842                 goto dangling;
3843         } else if (rc == 0) {
3844                 count = ldata.ld_leh->leh_reccount;
3845                 rc = linkea_links_find(&ldata, cname, pfid);
3846                 if ((rc == 0) &&
3847                     (count == 1 || !S_ISDIR(lfsck_object_type(obj)))) {
3848                         if ((lfsck_object_type(obj) & S_IFMT) !=
3849                             lnr->lnr_type) {
3850                                 ns->ln_flags |= LF_INCONSISTENT;
3851                                 type = LNIT_BAD_TYPE;
3852                         }
3853
3854                         goto record;
3855                 }
3856
3857                 ns->ln_flags |= LF_INCONSISTENT;
3858
3859                 /* If the file type stored in the name entry does not match
3860                  * the file type claimed by the object, and the object does
3861                  * not recognize the name entry, then it is quite possible
3862                  * that the name entry is corrupted. */
3863                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type) {
3864                         type = LNIT_BAD_DIRENT;
3865
3866                         GOTO(stop, rc = 0);
3867                 }
3868
3869                 /* For sub-dir object, we cannot make sure whether the sub-dir
3870                  * back references the parent via ".." name entry correctly or
3871                  * not in the LFSCK first-stage scanning. It may be that the
3872                  * (remote) sub-dir ".." name entry has no parent FID after
3873                  * file-level backup/restore and its linkEA may be wrong.
3874                  * So under such case, we should replace the linkEA according
3875                  * to current name entry. But this needs to be done during the
3876                  * LFSCK second-stage scanning. The LFSCK will record the name
3877                  * entry for further possible using. */
3878                 remove = false;
3879                 newdata = false;
3880                 goto nodata;
3881         } else if (unlikely(rc == -EINVAL)) {
3882                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type)
3883                         type = LNIT_BAD_TYPE;
3884
3885                 count = 1;
3886                 ns->ln_flags |= LF_INCONSISTENT;
3887                 /* The magic crashed, we are not sure whether there are more
3888                  * corrupt data in the linkea, so remove all linkea entries. */
3889                 remove = true;
3890                 newdata = true;
3891                 goto nodata;
3892         } else if (rc == -ENODATA) {
3893                 if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type)
3894                         type = LNIT_BAD_TYPE;
3895
3896                 count = 1;
3897                 ns->ln_flags |= LF_UPGRADE;
3898                 remove = false;
3899                 newdata = true;
3900
3901 nodata:
3902                 if (bk->lb_param & LPF_DRYRUN) {
3903                         ns->ln_linkea_repaired++;
3904                         repaired = true;
3905                         log = true;
3906                         goto record;
3907                 }
3908
3909                 if (!lustre_handle_is_used(&lh))
3910                         goto again;
3911
3912                 if (remove) {
3913                         LASSERT(newdata);
3914
3915                         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, handle,
3916                                           BYPASS_CAPA);
3917                         if (rc != 0)
3918                                 GOTO(stop, rc);
3919                 }
3920
3921                 if (newdata) {
3922                         rc = linkea_data_new(&ldata,
3923                                         &lfsck_env_info(env)->lti_linkea_buf);
3924                         if (rc != 0)
3925                                 GOTO(stop, rc);
3926                 }
3927
3928                 rc = linkea_add_buf(&ldata, cname, pfid);
3929                 if (rc != 0)
3930                         GOTO(stop, rc);
3931
3932                 rc = lfsck_links_write(env, obj, &ldata, handle);
3933                 if (rc != 0)
3934                         GOTO(stop, rc);
3935
3936                 count = ldata.ld_leh->leh_reccount;
3937                 if (!S_ISDIR(lfsck_object_type(obj)) ||
3938                     !dt_object_remote(obj)) {
3939                         ns->ln_linkea_repaired++;
3940                         repaired = true;
3941                         log = true;
3942                 }
3943         } else {
3944                 GOTO(stop, rc);
3945         }
3946
3947 record:
3948         LASSERT(count > 0);
3949
3950         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
3951         if (rc != 0)
3952                 GOTO(stop, rc);
3953
3954         if ((count == 1 && la->la_nlink == 1) ||
3955             S_ISDIR(lfsck_object_type(obj)))
3956                 /* Usually, it is for single linked object or dir, do nothing.*/
3957                 GOTO(stop, rc);
3958
3959         /* Following modification will be in another transaction.  */
3960         if (handle != NULL) {
3961                 dt_write_unlock(env, obj);
3962                 dtlocked = false;
3963
3964                 dt_trans_stop(env, dev, handle);
3965                 handle = NULL;
3966
3967                 lfsck_ibits_unlock(&lh, LCK_EX);
3968         }
3969
3970         ns->ln_mul_linked_checked++;
3971         rc = lfsck_namespace_trace_update(env, com, &lnr->lnr_fid,
3972                                           LNTF_CHECK_LINKEA, true);
3973
3974         GOTO(out, rc);
3975
3976 stop:
3977         if (dtlocked)
3978                 dt_write_unlock(env, obj);
3979
3980         if (handle != NULL && !IS_ERR(handle))
3981                 dt_trans_stop(env, dev, handle);
3982
3983 out:
3984         lfsck_ibits_unlock(&lh, LCK_EX);
3985
3986         if (rc >= 0) {
3987                 switch (type) {
3988                 case LNIT_BAD_TYPE:
3989                         log = false;
3990                         rc = lfsck_namespace_repair_dirent(env, com, dir,
3991                                         obj, lnr->lnr_name, lnr->lnr_name,
3992                                         lnr->lnr_type, true, false);
3993                         if (rc > 0)
3994                                 repaired = true;
3995                         break;
3996                 case LNIT_BAD_DIRENT:
3997                         log = false;
3998                         /* XXX: This is a bad dirent, we do not know whether
3999                          *      the original name entry reference a regular
4000                          *      file or a directory, then keep the parent's
4001                          *      nlink count unchanged here. */
4002                         rc = lfsck_namespace_repair_dirent(env, com, dir,
4003                                         obj, lnr->lnr_name, lnr->lnr_name,
4004                                         lnr->lnr_type, false, false);
4005                         if (rc > 0)
4006                                 repaired = true;
4007                         break;
4008                 default:
4009                         break;
4010                 }
4011         }
4012
4013         down_write(&com->lc_sem);
4014         if (rc < 0) {
4015                 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail to handle "
4016                        "the entry: "DFID", parent "DFID", name %.*s: rc = %d\n",
4017                        lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid),
4018                        PFID(lfsck_dto2fid(lnr->lnr_obj)),
4019                        lnr->lnr_namelen, lnr->lnr_name, rc);
4020
4021                 lfsck_namespace_record_failure(env, lfsck, ns);
4022                 if (!(bk->lb_param & LPF_FAILOUT))
4023                         rc = 0;
4024         } else {
4025                 if (log)
4026                         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant "
4027                                "repaired the entry: "DFID", parent "DFID
4028                                ", name %.*s\n", lfsck_lfsck2name(lfsck),
4029                                PFID(&lnr->lnr_fid),
4030                                PFID(lfsck_dto2fid(lnr->lnr_obj)),
4031                                lnr->lnr_namelen, lnr->lnr_name);
4032
4033                 if (repaired) {
4034                         ns->ln_items_repaired++;
4035
4036                         switch (type) {
4037                         case LNIT_DANGLING:
4038                                 ns->ln_dangling_repaired++;
4039                                 break;
4040                         case LNIT_BAD_TYPE:
4041                                 ns->ln_bad_type_repaired++;
4042                                 break;
4043                         case LNIT_BAD_DIRENT:
4044                                 ns->ln_dirent_repaired++;
4045                                 break;
4046                         default:
4047                                 break;
4048                         }
4049
4050                         if (bk->lb_param & LPF_DRYRUN &&
4051                             lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
4052                                 lfsck_pos_fill(env, lfsck,
4053                                                &ns->ln_pos_first_inconsistent,
4054                                                false);
4055                 }
4056
4057                 rc = 0;
4058         }
4059         up_write(&com->lc_sem);
4060
4061         if (obj != NULL && !IS_ERR(obj))
4062                 lfsck_object_put(env, obj);
4063         return rc;
4064 }
4065
4066 static int lfsck_namespace_assistant_handler_p2(const struct lu_env *env,
4067                                                 struct lfsck_component *com)
4068 {
4069         struct lfsck_instance   *lfsck  = com->lc_lfsck;
4070         struct ptlrpc_thread    *thread = &lfsck->li_thread;
4071         struct lfsck_bookmark   *bk     = &lfsck->li_bookmark_ram;
4072         struct lfsck_namespace  *ns     = com->lc_file_ram;
4073         struct dt_object        *obj    = com->lc_obj;
4074         const struct dt_it_ops  *iops   = &obj->do_index_ops->dio_it;
4075         struct dt_object        *target;
4076         struct dt_it            *di;
4077         struct dt_key           *key;
4078         struct lu_fid            fid;
4079         int                      rc;
4080         __u8                     flags  = 0;
4081         ENTRY;
4082
4083         CDEBUG(D_LFSCK, "%s: namespace LFSCK phase2 scan start\n",
4084                lfsck_lfsck2name(lfsck));
4085
4086         com->lc_new_checked = 0;
4087         com->lc_new_scanned = 0;
4088         com->lc_time_last_checkpoint = cfs_time_current();
4089         com->lc_time_next_checkpoint = com->lc_time_last_checkpoint +
4090                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
4091
4092         di = iops->init(env, obj, 0, BYPASS_CAPA);
4093         if (IS_ERR(di))
4094                 RETURN(PTR_ERR(di));
4095
4096         fid_cpu_to_be(&fid, &ns->ln_fid_latest_scanned_phase2);
4097         rc = iops->get(env, di, (const struct dt_key *)&fid);
4098         if (rc < 0)
4099                 GOTO(fini, rc);
4100
4101         /* Skip the start one, which either has been processed or non-exist. */
4102         rc = iops->next(env, di);
4103         if (rc != 0)
4104                 GOTO(put, rc);
4105
4106         do {
4107                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_DELAY3) &&
4108                     cfs_fail_val > 0) {
4109                         struct l_wait_info lwi;
4110
4111                         lwi = LWI_TIMEOUT(cfs_time_seconds(cfs_fail_val),
4112                                           NULL, NULL);
4113                         l_wait_event(thread->t_ctl_waitq,
4114                                      !thread_is_running(thread),
4115                                      &lwi);
4116
4117                         if (unlikely(!thread_is_running(thread)))
4118                                 GOTO(put, rc = 0);
4119                 }
4120
4121                 key = iops->key(env, di);
4122                 fid_be_to_cpu(&fid, (const struct lu_fid *)key);
4123                 if (!fid_is_sane(&fid)) {
4124                         rc = 0;
4125                         goto checkpoint;
4126                 }
4127
4128                 target = lfsck_object_find(env, lfsck, &fid);
4129                 if (IS_ERR(target)) {
4130                         rc = PTR_ERR(target);
4131                         goto checkpoint;
4132                 }
4133
4134                 if (dt_object_exists(target)) {
4135                         rc = iops->rec(env, di, (struct dt_rec *)&flags, 0);
4136                         if (rc == 0) {
4137                                 rc = lfsck_namespace_double_scan_one(env, com,
4138                                                                 target, flags);
4139                                 if (rc == -ENOENT)
4140                                         rc = 0;
4141                         }
4142                 }
4143
4144                 lfsck_object_put(env, target);
4145
4146 checkpoint:
4147                 down_write(&com->lc_sem);
4148                 com->lc_new_checked++;
4149                 com->lc_new_scanned++;
4150                 ns->ln_fid_latest_scanned_phase2 = fid;
4151                 if (rc > 0)
4152                         ns->ln_objs_repaired_phase2++;
4153                 else if (rc < 0)
4154                         ns->ln_objs_failed_phase2++;
4155                 up_write(&com->lc_sem);
4156
4157                 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
4158                         GOTO(put, rc);
4159
4160                 if (unlikely(cfs_time_beforeq(com->lc_time_next_checkpoint,
4161                                               cfs_time_current())) &&
4162                     com->lc_new_checked != 0) {
4163                         down_write(&com->lc_sem);
4164                         ns->ln_run_time_phase2 +=
4165                                 cfs_duration_sec(cfs_time_current() +
4166                                 HALF_SEC - com->lc_time_last_checkpoint);
4167                         ns->ln_time_last_checkpoint = cfs_time_current_sec();
4168                         ns->ln_objs_checked_phase2 += com->lc_new_checked;
4169                         com->lc_new_checked = 0;
4170                         rc = lfsck_namespace_store(env, com, false);
4171                         up_write(&com->lc_sem);
4172                         if (rc != 0)
4173                                 GOTO(put, rc);
4174
4175                         com->lc_time_last_checkpoint = cfs_time_current();
4176                         com->lc_time_next_checkpoint =
4177                                 com->lc_time_last_checkpoint +
4178                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
4179                 }
4180
4181                 lfsck_control_speed_by_self(com);
4182                 if (unlikely(!thread_is_running(thread)))
4183                         GOTO(put, rc = 0);
4184
4185                 rc = iops->next(env, di);
4186         } while (rc == 0);
4187
4188         GOTO(put, rc);
4189
4190 put:
4191         iops->put(env, di);
4192
4193 fini:
4194         iops->fini(env, di);
4195
4196         CDEBUG(D_LFSCK, "%s: namespace LFSCK phase2 scan stop: rc = %d\n",
4197                lfsck_lfsck2name(lfsck), rc);
4198
4199         return rc;
4200 }
4201
4202 static void lfsck_namespace_assistant_fill_pos(const struct lu_env *env,
4203                                                struct lfsck_component *com,
4204                                                struct lfsck_position *pos)
4205 {
4206         struct lfsck_assistant_data     *lad = com->lc_data;
4207         struct lfsck_namespace_req      *lnr;
4208
4209         if (list_empty(&lad->lad_req_list))
4210                 return;
4211
4212         lnr = list_entry(lad->lad_req_list.next,
4213                          struct lfsck_namespace_req,
4214                          lnr_lar.lar_list);
4215         pos->lp_oit_cookie = lnr->lnr_oit_cookie;
4216         pos->lp_dir_cookie = lnr->lnr_dir_cookie - 1;
4217         pos->lp_dir_parent = *lfsck_dto2fid(lnr->lnr_obj);
4218 }
4219
4220 static int lfsck_namespace_double_scan_result(const struct lu_env *env,
4221                                               struct lfsck_component *com,
4222                                               int rc)
4223 {
4224         struct lfsck_instance   *lfsck  = com->lc_lfsck;
4225         struct lfsck_namespace  *ns     = com->lc_file_ram;
4226
4227         down_write(&com->lc_sem);
4228         ns->ln_run_time_phase2 += cfs_duration_sec(cfs_time_current() +
4229                                 HALF_SEC - lfsck->li_time_last_checkpoint);
4230         ns->ln_time_last_checkpoint = cfs_time_current_sec();
4231         ns->ln_objs_checked_phase2 += com->lc_new_checked;
4232         com->lc_new_checked = 0;
4233
4234         if (rc > 0) {
4235                 if (ns->ln_flags & LF_INCOMPLETE)
4236                         ns->ln_status = LS_PARTIAL;
4237                 else
4238                         ns->ln_status = LS_COMPLETED;
4239                 if (!(lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN))
4240                         ns->ln_flags &= ~(LF_SCANNED_ONCE | LF_INCONSISTENT);
4241                 ns->ln_time_last_complete = ns->ln_time_last_checkpoint;
4242                 ns->ln_success_count++;
4243         } else if (rc == 0) {
4244                 ns->ln_status = lfsck->li_status;
4245                 if (ns->ln_status == 0)
4246                         ns->ln_status = LS_STOPPED;
4247         } else {
4248                 ns->ln_status = LS_FAILED;
4249         }
4250
4251         rc = lfsck_namespace_store(env, com, false);
4252         up_write(&com->lc_sem);
4253
4254         return rc;
4255 }
4256
4257 static void lfsck_namespace_assistant_sync_failures(const struct lu_env *env,
4258                                                     struct lfsck_component *com,
4259                                                     struct lfsck_request *lr)
4260 {
4261         /* XXX: TBD */
4262 }
4263
4264 struct lfsck_assistant_operations lfsck_namespace_assistant_ops = {
4265         .la_handler_p1          = lfsck_namespace_assistant_handler_p1,
4266         .la_handler_p2          = lfsck_namespace_assistant_handler_p2,
4267         .la_fill_pos            = lfsck_namespace_assistant_fill_pos,
4268         .la_double_scan_result  = lfsck_namespace_double_scan_result,
4269         .la_req_fini            = lfsck_namespace_assistant_req_fini,
4270         .la_sync_failures       = lfsck_namespace_assistant_sync_failures,
4271 };
4272
4273 /**
4274  * Verify the specified linkEA entry for the given directory object.
4275  * If the object has no such linkEA entry or it has more other linkEA
4276  * entries, then re-generate the linkEA with the given information.
4277  *
4278  * \param[in] env       pointer to the thread context
4279  * \param[in] dev       pointer to the dt_device
4280  * \param[in] obj       pointer to the dt_object to be handled
4281  * \param[in] cname     the name for the child in the parent directory
4282  * \param[in] pfid      the parent directory's FID for the linkEA
4283  *
4284  * \retval              0 for success
4285  * \retval              negative error number on failure
4286  */
4287 int lfsck_verify_linkea(const struct lu_env *env, struct dt_device *dev,
4288                         struct dt_object *obj, const struct lu_name *cname,
4289                         const struct lu_fid *pfid)
4290 {
4291         struct linkea_data       ldata  = { 0 };
4292         struct lu_buf            linkea_buf;
4293         struct thandle          *th;
4294         int                      rc;
4295         int                      fl     = LU_XATTR_CREATE;
4296         bool                     dirty  = false;
4297         ENTRY;
4298
4299         LASSERT(S_ISDIR(lfsck_object_type(obj)));
4300
4301         rc = lfsck_links_read(env, obj, &ldata);
4302         if (rc == -ENODATA) {
4303                 dirty = true;
4304         } else if (rc == 0) {
4305                 fl = LU_XATTR_REPLACE;
4306                 if (ldata.ld_leh->leh_reccount != 1) {
4307                         dirty = true;
4308                 } else {
4309                         rc = linkea_links_find(&ldata, cname, pfid);
4310                         if (rc != 0)
4311                                 dirty = true;
4312                 }
4313         }
4314
4315         if (!dirty)
4316                 RETURN(rc);
4317
4318         rc = linkea_data_new(&ldata, &lfsck_env_info(env)->lti_linkea_buf);
4319         if (rc != 0)
4320                 RETURN(rc);
4321
4322         rc = linkea_add_buf(&ldata, cname, pfid);
4323         if (rc != 0)
4324                 RETURN(rc);
4325
4326         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
4327                        ldata.ld_leh->leh_len);
4328         th = dt_trans_create(env, dev);
4329         if (IS_ERR(th))
4330                 RETURN(PTR_ERR(th));
4331
4332         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
4333                                   XATTR_NAME_LINK, fl, th);
4334         if (rc != 0)
4335                 GOTO(stop, rc);
4336
4337         rc = dt_trans_start_local(env, dev, th);
4338         if (rc != 0)
4339                 GOTO(stop, rc);
4340
4341         dt_write_lock(env, obj, 0);
4342         rc = dt_xattr_set(env, obj, &linkea_buf,
4343                           XATTR_NAME_LINK, fl, th, BYPASS_CAPA);
4344         dt_write_unlock(env, obj);
4345
4346         GOTO(stop, rc);
4347
4348 stop:
4349         dt_trans_stop(env, dev, th);
4350         return rc;
4351 }
4352
4353 /**
4354  * Get the name and parent directory's FID from the first linkEA entry.
4355  *
4356  * \param[in] env       pointer to the thread context
4357  * \param[in] obj       pointer to the object which get linkEA from
4358  * \param[out] name     pointer to the buffer to hold the name
4359  *                      in the first linkEA entry
4360  * \param[out] pfid     pointer to the buffer to hold the parent
4361  *                      directory's FID in the first linkEA entry
4362  *
4363  * \retval              0 for success
4364  * \retval              negative error number on failure
4365  */
4366 int lfsck_links_get_first(const struct lu_env *env, struct dt_object *obj,
4367                           char *name, struct lu_fid *pfid)
4368 {
4369         struct lu_name           *cname = &lfsck_env_info(env)->lti_name;
4370         struct linkea_data        ldata = { 0 };
4371         int                       rc;
4372
4373         rc = lfsck_links_read(env, obj, &ldata);
4374         if (rc != 0)
4375                 return rc;
4376
4377         linkea_first_entry(&ldata);
4378         if (ldata.ld_lee == NULL)
4379                 return -ENODATA;
4380
4381         linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen, cname, pfid);
4382         /* To guarantee the 'name' is terminated with '0'. */
4383         memcpy(name, cname->ln_name, cname->ln_namelen);
4384         name[cname->ln_namelen] = 0;
4385
4386         return 0;
4387 }
4388
4389 /**
4390  * Remove the name entry from the parent directory.
4391  *
4392  * No need to care about the object referenced by the name entry,
4393  * either the name entry is invalid or redundant, or the referenced
4394  * object has been processed has been or will be handled by others.
4395  *
4396  * \param[in] env       pointer to the thread context
4397  * \param[in] lfsck     pointer to the lfsck instance
4398  * \param[in] parent    pointer to the lost+found object
4399  * \param[in] name      the name for the name entry to be removed
4400  * \param[in] type      the type for the name entry to be removed
4401  *
4402  * \retval              0 for success
4403  * \retval              negative error number on failure
4404  */
4405 int lfsck_remove_name_entry(const struct lu_env *env,
4406                             struct lfsck_instance *lfsck,
4407                             struct dt_object *parent,
4408                             const char *name, __u32 type)
4409 {
4410         struct dt_device        *dev    = lfsck->li_next;
4411         struct thandle          *th;
4412         struct lustre_handle     lh     = { 0 };
4413         int                      rc;
4414         ENTRY;
4415
4416         rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
4417                               MDS_INODELOCK_UPDATE, LCK_EX);
4418         if (rc != 0)
4419                 RETURN(rc);
4420
4421         th = dt_trans_create(env, dev);
4422         if (IS_ERR(th))
4423                 GOTO(unlock, rc = PTR_ERR(th));
4424
4425         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
4426         if (rc != 0)
4427                 GOTO(stop, rc);
4428
4429         if (S_ISDIR(type)) {
4430                 rc = dt_declare_ref_del(env, parent, th);
4431                 if (rc != 0)
4432                         GOTO(stop, rc);
4433         }
4434
4435         rc = dt_trans_start(env, dev, th);
4436         if (rc != 0)
4437                 GOTO(stop, rc);
4438
4439         rc = dt_delete(env, parent, (const struct dt_key *)name, th,
4440                        BYPASS_CAPA);
4441         if (rc != 0)
4442                 GOTO(stop, rc);
4443
4444         if (S_ISDIR(type)) {
4445                 dt_write_lock(env, parent, 0);
4446                 rc = dt_ref_del(env, parent, th);
4447                 dt_write_unlock(env, parent);
4448         }
4449
4450         GOTO(stop, rc);
4451
4452 stop:
4453         dt_trans_stop(env, dev, th);
4454
4455 unlock:
4456         lfsck_ibits_unlock(&lh, LCK_EX);
4457
4458         CDEBUG(D_LFSCK, "%s: remove name entry "DFID"/%s "
4459                "with type %o: rc = %d\n", lfsck_lfsck2name(lfsck),
4460                PFID(lfsck_dto2fid(parent)), name, type, rc);
4461
4462         return rc;
4463 }
4464
4465 /**
4466  * Update the object's name entry with the given FID.
4467  *
4468  * \param[in] env       pointer to the thread context
4469  * \param[in] lfsck     pointer to the lfsck instance
4470  * \param[in] parent    pointer to the parent directory that holds
4471  *                      the name entry
4472  * \param[in] name      the name for the entry to be updated
4473  * \param[in] pfid      the new PFID for the name entry
4474  * \param[in] type      the type for the name entry to be updated
4475  *
4476  * \retval              0 for success
4477  * \retval              negative error number on failure
4478  */
4479 int lfsck_update_name_entry(const struct lu_env *env,
4480                             struct lfsck_instance *lfsck,
4481                             struct dt_object *parent, const char *name,
4482                             const struct lu_fid *pfid, __u32 type)
4483 {
4484         struct dt_insert_rec    *rec    = &lfsck_env_info(env)->lti_dt_rec;
4485         struct dt_device        *dev    = lfsck->li_next;
4486         struct lustre_handle     lh     = { 0 };
4487         struct thandle          *th;
4488         int                      rc;
4489         bool                     exists = true;
4490         ENTRY;
4491
4492         rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
4493                               MDS_INODELOCK_UPDATE, LCK_EX);
4494         if (rc != 0)
4495                 RETURN(rc);
4496
4497         th = dt_trans_create(env, dev);
4498         if (IS_ERR(th))
4499                 GOTO(unlock, rc = PTR_ERR(th));
4500
4501         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
4502         if (rc != 0)
4503                 GOTO(stop, rc);
4504
4505         rec->rec_type = type;
4506         rec->rec_fid = pfid;
4507         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
4508                                (const struct dt_key *)name, th);
4509         if (rc != 0)
4510                 GOTO(stop, rc);
4511
4512         rc = dt_declare_ref_add(env, parent, th);
4513         if (rc != 0)
4514                 GOTO(stop, rc);
4515
4516         rc = dt_trans_start(env, dev, th);
4517         if (rc != 0)
4518                 GOTO(stop, rc);
4519
4520         rc = dt_delete(env, parent, (const struct dt_key *)name, th,
4521                        BYPASS_CAPA);
4522         if (rc == -ENOENT) {
4523                 exists = false;
4524                 rc = 0;
4525         }
4526
4527         if (rc != 0)
4528                 GOTO(stop, rc);
4529
4530         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
4531                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
4532         if (rc == 0 && S_ISDIR(type) && !exists) {
4533                 dt_write_lock(env, parent, 0);
4534                 rc = dt_ref_add(env, parent, th);
4535                 dt_write_unlock(env, parent);
4536         }
4537
4538         GOTO(stop, rc);
4539
4540 stop:
4541         dt_trans_stop(env, dev, th);
4542
4543 unlock:
4544         lfsck_ibits_unlock(&lh, LCK_EX);
4545
4546         CDEBUG(D_LFSCK, "%s: update name entry "DFID"/%s with the FID "DFID
4547                " and the type %o: rc = %d\n", lfsck_lfsck2name(lfsck),
4548                PFID(lfsck_dto2fid(parent)), name, PFID(pfid), type, rc);
4549
4550         return rc;
4551 }
4552
4553 int lfsck_namespace_setup(const struct lu_env *env,
4554                           struct lfsck_instance *lfsck)
4555 {
4556         struct lfsck_component  *com;
4557         struct lfsck_namespace  *ns;
4558         struct dt_object        *root = NULL;
4559         struct dt_object        *obj;
4560         int                      rc;
4561         ENTRY;
4562
4563         LASSERT(lfsck->li_master);
4564
4565         OBD_ALLOC_PTR(com);
4566         if (com == NULL)
4567                 RETURN(-ENOMEM);
4568
4569         INIT_LIST_HEAD(&com->lc_link);
4570         INIT_LIST_HEAD(&com->lc_link_dir);
4571         init_rwsem(&com->lc_sem);
4572         atomic_set(&com->lc_ref, 1);
4573         com->lc_lfsck = lfsck;
4574         com->lc_type = LFSCK_TYPE_NAMESPACE;
4575         com->lc_ops = &lfsck_namespace_ops;
4576         com->lc_data = lfsck_assistant_data_init(
4577                         &lfsck_namespace_assistant_ops,
4578                         "lfsck_namespace");
4579         if (com->lc_data == NULL)
4580                 GOTO(out, rc = -ENOMEM);
4581
4582         com->lc_file_size = sizeof(struct lfsck_namespace);
4583         OBD_ALLOC(com->lc_file_ram, com->lc_file_size);
4584         if (com->lc_file_ram == NULL)
4585                 GOTO(out, rc = -ENOMEM);
4586
4587         OBD_ALLOC(com->lc_file_disk, com->lc_file_size);
4588         if (com->lc_file_disk == NULL)
4589                 GOTO(out, rc = -ENOMEM);
4590
4591         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
4592         if (IS_ERR(root))
4593                 GOTO(out, rc = PTR_ERR(root));
4594
4595         if (unlikely(!dt_try_as_dir(env, root)))
4596                 GOTO(out, rc = -ENOTDIR);
4597
4598         obj = local_index_find_or_create(env, lfsck->li_los, root,
4599                                          lfsck_namespace_name,
4600                                          S_IFREG | S_IRUGO | S_IWUSR,
4601                                          &dt_lfsck_features);
4602         if (IS_ERR(obj))
4603                 GOTO(out, rc = PTR_ERR(obj));
4604
4605         com->lc_obj = obj;
4606         rc = obj->do_ops->do_index_try(env, obj, &dt_lfsck_features);
4607         if (rc != 0)
4608                 GOTO(out, rc);
4609
4610         rc = lfsck_namespace_load(env, com);
4611         if (rc > 0)
4612                 rc = lfsck_namespace_reset(env, com, true);
4613         else if (rc == -ENODATA)
4614                 rc = lfsck_namespace_init(env, com);
4615         if (rc != 0)
4616                 GOTO(out, rc);
4617
4618         ns = com->lc_file_ram;
4619         switch (ns->ln_status) {
4620         case LS_INIT:
4621         case LS_COMPLETED:
4622         case LS_FAILED:
4623         case LS_STOPPED:
4624                 spin_lock(&lfsck->li_lock);
4625                 list_add_tail(&com->lc_link, &lfsck->li_list_idle);
4626                 spin_unlock(&lfsck->li_lock);
4627                 break;
4628         default:
4629                 CERROR("%s: unknown lfsck_namespace status %d\n",
4630                        lfsck_lfsck2name(lfsck), ns->ln_status);
4631                 /* fall through */
4632         case LS_SCANNING_PHASE1:
4633         case LS_SCANNING_PHASE2:
4634                 /* No need to store the status to disk right now.
4635                  * If the system crashed before the status stored,
4636                  * it will be loaded back when next time. */
4637                 ns->ln_status = LS_CRASHED;
4638                 /* fall through */
4639         case LS_PAUSED:
4640         case LS_CRASHED:
4641                 spin_lock(&lfsck->li_lock);
4642                 list_add_tail(&com->lc_link, &lfsck->li_list_scan);
4643                 list_add_tail(&com->lc_link_dir, &lfsck->li_list_dir);
4644                 spin_unlock(&lfsck->li_lock);
4645                 break;
4646         }
4647
4648         GOTO(out, rc = 0);
4649
4650 out:
4651         if (root != NULL && !IS_ERR(root))
4652                 lu_object_put(env, &root->do_lu);
4653         if (rc != 0) {
4654                 lfsck_component_cleanup(env, com);
4655                 CERROR("%s: fail to init namespace LFSCK component: rc = %d\n",
4656                        lfsck_lfsck2name(lfsck), rc);
4657         }
4658         return rc;
4659 }