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         dst->ln_bitmap_size = le32_to_cpu(src->ln_bitmap_size);
 135 }
 136
 137 static void lfsck_namespace_cpu_to_le(struct lfsck_namespace *dst,
 138                                       struct lfsck_namespace *src)
 139 {
 140         dst->ln_magic = cpu_to_le32(src->ln_magic);
 141         dst->ln_status = cpu_to_le32(src->ln_status);
 142         dst->ln_flags = cpu_to_le32(src->ln_flags);
 143         dst->ln_success_count = cpu_to_le32(src->ln_success_count);
 144         dst->ln_run_time_phase1 = cpu_to_le32(src->ln_run_time_phase1);
 145         dst->ln_run_time_phase2 = cpu_to_le32(src->ln_run_time_phase2);
 146         dst->ln_time_last_complete = cpu_to_le64(src->ln_time_last_complete);
 147         dst->ln_time_latest_start = cpu_to_le64(src->ln_time_latest_start);
 148         dst->ln_time_last_checkpoint =
 149                                 cpu_to_le64(src->ln_time_last_checkpoint);
 150         lfsck_position_cpu_to_le(&dst->ln_pos_latest_start,
 151                                  &src->ln_pos_latest_start);
 152         lfsck_position_cpu_to_le(&dst->ln_pos_last_checkpoint,
 153                                  &src->ln_pos_last_checkpoint);
 154         lfsck_position_cpu_to_le(&dst->ln_pos_first_inconsistent,
 155                                  &src->ln_pos_first_inconsistent);
 156         dst->ln_items_checked = cpu_to_le64(src->ln_items_checked);
 157         dst->ln_items_repaired = cpu_to_le64(src->ln_items_repaired);
 158         dst->ln_items_failed = cpu_to_le64(src->ln_items_failed);
 159         dst->ln_dirs_checked = cpu_to_le64(src->ln_dirs_checked);
 160         dst->ln_objs_checked_phase2 = cpu_to_le64(src->ln_objs_checked_phase2);
 161         dst->ln_objs_repaired_phase2 =
 162                                 cpu_to_le64(src->ln_objs_repaired_phase2);
 163         dst->ln_objs_failed_phase2 = cpu_to_le64(src->ln_objs_failed_phase2);
 164         dst->ln_objs_nlink_repaired = cpu_to_le64(src->ln_objs_nlink_repaired);
 165         fid_cpu_to_le(&dst->ln_fid_latest_scanned_phase2,
 166                       &src->ln_fid_latest_scanned_phase2);
 167         dst->ln_dirent_repaired = cpu_to_le64(src->ln_dirent_repaired);
 168         dst->ln_linkea_repaired = cpu_to_le64(src->ln_linkea_repaired);
 169         dst->ln_mul_linked_checked = cpu_to_le64(src->ln_mul_linked_checked);
 170         dst->ln_mul_linked_repaired = cpu_to_le64(src->ln_mul_linked_repaired);
 171         dst->ln_unknown_inconsistency =
 172                                 cpu_to_le64(src->ln_unknown_inconsistency);
 173         dst->ln_unmatched_pairs_repaired =
 174                                 cpu_to_le64(src->ln_unmatched_pairs_repaired);
 175         dst->ln_dangling_repaired = cpu_to_le64(src->ln_dangling_repaired);
 176         dst->ln_mul_ref_repaired = cpu_to_le64(src->ln_mul_ref_repaired);
 177         dst->ln_bad_type_repaired = cpu_to_le64(src->ln_bad_type_repaired);
 178         dst->ln_lost_dirent_repaired =
 179                                 cpu_to_le64(src->ln_lost_dirent_repaired);
 180         dst->ln_bitmap_size = cpu_to_le32(src->ln_bitmap_size);
 181 }
 182
 183 static void lfsck_namespace_record_failure(const struct lu_env *env,
 184                                            struct lfsck_instance *lfsck,
 185                                            struct lfsck_namespace *ns)
 186 {
 187         struct lfsck_position pos;
 188
 189         ns->ln_items_failed++;
 190         lfsck_pos_fill(env, lfsck, &pos, false);
 191         if (lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent) ||
 192             lfsck_pos_is_eq(&pos, &ns->ln_pos_first_inconsistent) < 0) {
 193                 ns->ln_pos_first_inconsistent = pos;
 194
 195                 CDEBUG(D_LFSCK, "%s: namespace LFSCK hit first non-repaired "
 196                        "inconsistency at the pos ["LPU64", "DFID", "LPX64"]\n",
 197                        lfsck_lfsck2name(lfsck),
 198                        ns->ln_pos_first_inconsistent.lp_oit_cookie,
 199                        PFID(&ns->ln_pos_first_inconsistent.lp_dir_parent),
 200                        ns->ln_pos_first_inconsistent.lp_dir_cookie);
 201         }
 202 }
 203
 204 /**
 205  * Load the MDT bitmap from the lfsck_namespace tracing file.
 206  *
 207  * \param[in] env       pointer to the thread context
 208  * \param[in] com       pointer to the lfsck component
 209  *
 210  * \retval              0 for success
 211  * \retval              negative error number on failure or data corruption
 212  */
 213 static int lfsck_namespace_load_bitmap(const struct lu_env *env,
 214                                        struct lfsck_component *com)
 215 {
 216         struct dt_object                *obj    = com->lc_obj;
 217         struct lfsck_assistant_data     *lad    = com->lc_data;
 218         struct lfsck_namespace          *ns     = com->lc_file_ram;
 219         cfs_bitmap_t                    *bitmap = lad->lad_bitmap;
 220         ssize_t                          size;
 221         __u32                            nbits;
 222         int                              rc;
 223         ENTRY;
 224
 225         if (com->lc_lfsck->li_mdt_descs.ltd_tgts_bitmap->size >
 226             ns->ln_bitmap_size)
 227                 nbits = com->lc_lfsck->li_mdt_descs.ltd_tgts_bitmap->size;
 228         else
 229                 nbits = ns->ln_bitmap_size;
 230
 231         if (unlikely(nbits < BITS_PER_LONG))
 232                 nbits = BITS_PER_LONG;
 233
 234         if (nbits > bitmap->size) {
 235                 __u32 new_bits = bitmap->size;
 236                 cfs_bitmap_t *new_bitmap;
 237
 238                 while (new_bits < nbits)
 239                         new_bits <<= 1;
 240
 241                 new_bitmap = CFS_ALLOCATE_BITMAP(new_bits);
 242                 if (new_bitmap == NULL)
 243                         RETURN(-ENOMEM);
 244
 245                 lad->lad_bitmap = new_bitmap;
 246                 CFS_FREE_BITMAP(bitmap);
 247                 bitmap = new_bitmap;
 248         }
 249
 250         if (ns->ln_bitmap_size == 0) {
 251                 lad->lad_incomplete = 0;
 252                 CFS_RESET_BITMAP(bitmap);
 253
 254                 RETURN(0);
 255         }
 256
 257         size = (ns->ln_bitmap_size + 7) >> 3;
 258         rc = dt_xattr_get(env, obj,
 259                           lfsck_buf_get(env, bitmap->data, size),
 260                           XATTR_NAME_LFSCK_BITMAP, BYPASS_CAPA);
 261         if (rc != size)
 262                 RETURN(rc >= 0 ? -EINVAL : rc);
 263
 264         if (cfs_bitmap_check_empty(bitmap))
 265                 lad->lad_incomplete = 0;
 266         else
 267                 lad->lad_incomplete = 1;
 268
 269         RETURN(0);
 270 }
 271
 272 /**
 273  * \retval +ve: the lfsck_namespace is broken, the caller should reset it.
 274  * \retval 0: succeed.
 275  * \retval -ve: failed cases.
 276  */
 277 static int lfsck_namespace_load(const struct lu_env *env,
 278                                 struct lfsck_component *com)
 279 {
 280         int len = com->lc_file_size;
 281         int rc;
 282
 283         rc = dt_xattr_get(env, com->lc_obj,
 284                           lfsck_buf_get(env, com->lc_file_disk, len),
 285                           XATTR_NAME_LFSCK_NAMESPACE, BYPASS_CAPA);
 286         if (rc == len) {
 287                 struct lfsck_namespace *ns = com->lc_file_ram;
 288
 289                 lfsck_namespace_le_to_cpu(ns,
 290                                 (struct lfsck_namespace *)com->lc_file_disk);
 291                 if (ns->ln_magic != LFSCK_NAMESPACE_MAGIC) {
 292                         CDEBUG(D_LFSCK, "%s: invalid lfsck_namespace magic "
 293                                "%#x != %#x\n", lfsck_lfsck2name(com->lc_lfsck),
 294                                ns->ln_magic, LFSCK_NAMESPACE_MAGIC);
 295                         rc = 1;
 296                 } else {
 297                         rc = 0;
 298                 }
 299         } else if (rc != -ENODATA) {
 300                 CDEBUG(D_LFSCK, "%s: fail to load lfsck_namespace, "
 301                        "expected = %d: rc = %d\n",
 302                        lfsck_lfsck2name(com->lc_lfsck), len, rc);
 303                 if (rc >= 0)
 304                         rc = 1;
 305         }
 306         return rc;
 307 }
 308
 309 static int lfsck_namespace_store(const struct lu_env *env,
 310                                  struct lfsck_component *com)
 311 {
 312         struct dt_object                *obj    = com->lc_obj;
 313         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 314         struct lfsck_namespace          *ns     = com->lc_file_ram;
 315         struct lfsck_assistant_data     *lad    = com->lc_data;
 316         cfs_bitmap_t                    *bitmap = NULL;
 317         struct thandle                  *handle;
 318         __u32                            nbits  = 0;
 319         int                              len    = com->lc_file_size;
 320         int                              rc;
 321         ENTRY;
 322
 323         if (lad != NULL) {
 324                 bitmap = lad->lad_bitmap;
 325                 nbits = bitmap->size;
 326
 327                 LASSERT(nbits > 0);
 328                 LASSERTF((nbits & 7) == 0, "Invalid nbits %u\n", nbits);
 329         }
 330
 331         ns->ln_bitmap_size = nbits;
 332         lfsck_namespace_cpu_to_le((struct lfsck_namespace *)com->lc_file_disk,
 333                                   ns);
 334         handle = dt_trans_create(env, lfsck->li_bottom);
 335         if (IS_ERR(handle))
 336                 GOTO(log, rc = PTR_ERR(handle));
 337
 338         rc = dt_declare_xattr_set(env, obj,
 339                                   lfsck_buf_get(env, com->lc_file_disk, len),
 340                                   XATTR_NAME_LFSCK_NAMESPACE, 0, handle);
 341         if (rc != 0)
 342                 GOTO(out, rc);
 343
 344         if (bitmap != NULL) {
 345                 rc = dt_declare_xattr_set(env, obj,
 346                                 lfsck_buf_get(env, bitmap->data, nbits >> 3),
 347                                 XATTR_NAME_LFSCK_BITMAP, 0, handle);
 348                 if (rc != 0)
 349                         GOTO(out, rc);
 350         }
 351
 352         rc = dt_trans_start_local(env, lfsck->li_bottom, handle);
 353         if (rc != 0)
 354                 GOTO(out, rc);
 355
 356         rc = dt_xattr_set(env, obj,
 357                           lfsck_buf_get(env, com->lc_file_disk, len),
 358                           XATTR_NAME_LFSCK_NAMESPACE, 0, handle, BYPASS_CAPA);
 359         if (rc == 0 && bitmap != NULL)
 360                 rc = dt_xattr_set(env, obj,
 361                                   lfsck_buf_get(env, bitmap->data, nbits >> 3),
 362                                   XATTR_NAME_LFSCK_BITMAP, 0, handle,
 363                                   BYPASS_CAPA);
 364
 365         GOTO(out, rc);
 366
 367 out:
 368         dt_trans_stop(env, lfsck->li_bottom, handle);
 369
 370 log:
 371         if (rc != 0)
 372                 CDEBUG(D_LFSCK, "%s: fail to store lfsck_namespace: rc = %d\n",
 373                        lfsck_lfsck2name(lfsck), rc);
 374         return rc;
 375 }
 376
 377 static int lfsck_namespace_init(const struct lu_env *env,
 378                                 struct lfsck_component *com)
 379 {
 380         struct lfsck_namespace *ns = com->lc_file_ram;
 381         int rc;
 382
 383         memset(ns, 0, sizeof(*ns));
 384         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
 385         ns->ln_status = LS_INIT;
 386         down_write(&com->lc_sem);
 387         rc = lfsck_namespace_store(env, com);
 388         up_write(&com->lc_sem);
 389         return rc;
 390 }
 391
 392 /**
 393  * Update the namespace LFSCK tracing file for the given @fid
 394  *
 395  * \param[in] env       pointer to the thread context
 396  * \param[in] com       pointer to the lfsck component
 397  * \param[in] fid       the fid which flags to be updated in the lfsck
 398  *                      tracing file
 399  * \param[in] add       true if add new flags, otherwise remove flags
 400  *
 401  * \retval              0 for succeed or nothing to be done
 402  * \retval              negative error number on failure
 403  */
 404 int lfsck_namespace_trace_update(const struct lu_env *env,
 405                                  struct lfsck_component *com,
 406                                  const struct lu_fid *fid,
 407                                  const __u8 flags, bool add)
 408 {
 409         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 410         struct dt_object        *obj    = com->lc_obj;
 411         struct lu_fid           *key    = &lfsck_env_info(env)->lti_fid3;
 412         struct dt_device        *dev    = lfsck->li_bottom;
 413         struct thandle          *th     = NULL;
 414         int                      rc     = 0;
 415         __u8                     old    = 0;
 416         __u8                     new    = 0;
 417         ENTRY;
 418
 419         LASSERT(flags != 0);
 420
 421         down_write(&com->lc_sem);
 422         fid_cpu_to_be(key, fid);
 423         rc = dt_lookup(env, obj, (struct dt_rec *)&old,
 424                        (const struct dt_key *)key, BYPASS_CAPA);
 425         if (rc == -ENOENT) {
 426                 if (!add)
 427                         GOTO(unlock, rc = 0);
 428
 429                 old = 0;
 430                 new = flags;
 431         } else if (rc == 0) {
 432                 if (add) {
 433                         if ((old & flags) == flags)
 434                                 GOTO(unlock, rc = 0);
 435
 436                         new = old | flags;
 437                 } else {
 438                         if ((old & flags) == 0)
 439                                 GOTO(unlock, rc = 0);
 440
 441                         new = old & ~flags;
 442                 }
 443         } else {
 444                 GOTO(log, rc);
 445         }
 446
 447         th = dt_trans_create(env, dev);
 448         if (IS_ERR(th))
 449                 GOTO(log, rc = PTR_ERR(th));
 450
 451         if (old != 0) {
 452                 rc = dt_declare_delete(env, obj,
 453                                        (const struct dt_key *)key, th);
 454                 if (rc != 0)
 455                         GOTO(log, rc);
 456         }
 457
 458         if (new != 0) {
 459                 rc = dt_declare_insert(env, obj,
 460                                        (const struct dt_rec *)&new,
 461                                        (const struct dt_key *)key, th);
 462                 if (rc != 0)
 463                         GOTO(log, rc);
 464         }
 465
 466         rc = dt_trans_start_local(env, dev, th);
 467         if (rc != 0)
 468                 GOTO(log, rc);
 469
 470         if (old != 0) {
 471                 rc = dt_delete(env, obj, (const struct dt_key *)key,
 472                                th, BYPASS_CAPA);
 473                 if (rc != 0)
 474                         GOTO(log, rc);
 475         }
 476
 477         if (new != 0) {
 478                 rc = dt_insert(env, obj, (const struct dt_rec *)&new,
 479                                (const struct dt_key *)key, th, BYPASS_CAPA, 1);
 480                 if (rc != 0)
 481                         GOTO(log, rc);
 482         }
 483
 484         GOTO(log, rc);
 485
 486 log:
 487         if (th != NULL && !IS_ERR(th))
 488                 dt_trans_stop(env, dev, th);
 489
 490         CDEBUG(D_LFSCK, "%s: namespace LFSCK %s flags for "DFID" in the "
 491                "tracing file, flags %x, old %x, new %x: rc = %d\n",
 492                lfsck_lfsck2name(lfsck), add ? "add" : "del", PFID(fid),
 493                (__u32)flags, (__u32)old, (__u32)new, rc);
 494
 495 unlock:
 496         up_write(&com->lc_sem);
 497
 498         return rc;
 499 }
 500
 501 static int lfsck_namespace_check_exist(const struct lu_env *env,
 502                                        struct dt_object *dir,
 503                                        struct dt_object *obj, const char *name)
 504 {
 505         struct lu_fid    *fid = &lfsck_env_info(env)->lti_fid;
 506         int               rc;
 507         ENTRY;
 508
 509         if (unlikely(lfsck_is_dead_obj(obj)))
 510                 RETURN(LFSCK_NAMEENTRY_DEAD);
 511
 512         rc = dt_lookup(env, dir, (struct dt_rec *)fid,
 513                        (const struct dt_key *)name, BYPASS_CAPA);
 514         if (rc == -ENOENT)
 515                 RETURN(LFSCK_NAMEENTRY_REMOVED);
 516
 517         if (rc < 0)
 518                 RETURN(rc);
 519
 520         if (!lu_fid_eq(fid, lfsck_dto2fid(obj)))
 521                 RETURN(LFSCK_NAMEENTRY_RECREATED);
 522
 523         RETURN(0);
 524 }
 525
 526 static int lfsck_declare_namespace_exec_dir(const struct lu_env *env,
 527                                             struct dt_object *obj,
 528                                             struct thandle *handle)
 529 {
 530         int rc;
 531
 532         /* For destroying all invalid linkEA entries. */
 533         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, handle);
 534         if (rc != 0)
 535                 return rc;
 536
 537         /* For insert new linkEA entry. */
 538         rc = dt_declare_xattr_set(env, obj,
 539                         lfsck_buf_get_const(env, NULL, DEFAULT_LINKEA_SIZE),
 540                         XATTR_NAME_LINK, 0, handle);
 541         return rc;
 542 }
 543
 544 int __lfsck_links_read(const struct lu_env *env, struct dt_object *obj,
 545                        struct linkea_data *ldata)
 546 {
 547         int rc;
 548
 549         if (ldata->ld_buf->lb_buf == NULL)
 550                 return -ENOMEM;
 551
 552         if (!dt_object_exists(obj))
 553                 return -ENOENT;
 554
 555         rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK, BYPASS_CAPA);
 556         if (rc == -ERANGE) {
 557                 /* Buf was too small, figure out what we need. */
 558                 rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LINK,
 559                                   BYPASS_CAPA);
 560                 if (rc <= 0)
 561                         return rc;
 562
 563                 lu_buf_realloc(ldata->ld_buf, rc);
 564                 if (ldata->ld_buf->lb_buf == NULL)
 565                         return -ENOMEM;
 566
 567                 rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK,
 568                                   BYPASS_CAPA);
 569         }
 570
 571         if (rc > 0)
 572                 rc = linkea_init(ldata);
 573
 574         return rc;
 575 }
 576
 577 /**
 578  * Remove linkEA for the given object.
 579  *
 580  * The caller should take the ldlm lock before the calling.
 581  *
 582  * \param[in] env       pointer to the thread context
 583  * \param[in] com       pointer to the lfsck component
 584  * \param[in] obj       pointer to the dt_object to be handled
 585  *
 586  * \retval              0 for repaired cases
 587  * \retval              negative error number on failure
 588  */
 589 static int lfsck_namespace_links_remove(const struct lu_env *env,
 590                                         struct lfsck_component *com,
 591                                         struct dt_object *obj)
 592 {
 593         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 594         struct dt_device                *dev    = lfsck->li_bottom;
 595         struct thandle                  *th     = NULL;
 596         int                              rc     = 0;
 597         ENTRY;
 598
 599         LASSERT(dt_object_remote(obj) == 0);
 600
 601         th = dt_trans_create(env, dev);
 602         if (IS_ERR(th))
 603                 GOTO(log, rc = PTR_ERR(th));
 604
 605         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, th);
 606         if (rc != 0)
 607                 GOTO(stop, rc);
 608
 609         rc = dt_trans_start_local(env, dev, th);
 610         if (rc != 0)
 611                 GOTO(stop, rc);
 612
 613         dt_write_lock(env, obj, 0);
 614         if (unlikely(lfsck_is_dead_obj(obj)))
 615                 GOTO(unlock, rc = -ENOENT);
 616
 617         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
 618                 GOTO(unlock, rc = 0);
 619
 620         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, th, BYPASS_CAPA);
 621
 622         GOTO(unlock, rc);
 623
 624 unlock:
 625         dt_write_unlock(env, obj);
 626
 627 stop:
 628         dt_trans_stop(env, dev, th);
 629
 630 log:
 631         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove invalid linkEA "
 632                "for the object "DFID": rc = %d\n",
 633                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
 634
 635         if (rc == 0) {
 636                 struct lfsck_namespace *ns = com->lc_file_ram;
 637
 638                 ns->ln_flags |= LF_INCONSISTENT;
 639         }
 640
 641         return rc;
 642 }
 643
 644 static int lfsck_links_write(const struct lu_env *env, struct dt_object *obj,
 645                              struct linkea_data *ldata, struct thandle *handle)
 646 {
 647         const struct lu_buf *buf = lfsck_buf_get_const(env,
 648                                                        ldata->ld_buf->lb_buf,
 649                                                        ldata->ld_leh->leh_len);
 650
 651         return dt_xattr_set(env, obj, buf, XATTR_NAME_LINK, 0, handle,
 652                             BYPASS_CAPA);
 653 }
 654
 655 static void lfsck_namespace_unpack_linkea_entry(struct linkea_data *ldata,
 656                                                 struct lu_name *cname,
 657                                                 struct lu_fid *pfid,
 658                                                 char *buf)
 659 {
 660         linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, cname, pfid);
 661         /* To guarantee the 'name' is terminated with '0'. */
 662         memcpy(buf, cname->ln_name, cname->ln_namelen);
 663         buf[cname->ln_namelen] = 0;
 664         cname->ln_name = buf;
 665 }
 666
 667 static int lfsck_namespace_filter_linkea_entry(struct linkea_data *ldata,
 668                                                struct lu_name *cname,
 669                                                struct lu_fid *pfid,
 670                                                bool remove)
 671 {
 672         struct link_ea_entry    *oldlee;
 673         int                      oldlen;
 674         int                      repeated = 0;
 675
 676         oldlee = ldata->ld_lee;
 677         oldlen = ldata->ld_reclen;
 678         linkea_next_entry(ldata);
 679         while (ldata->ld_lee != NULL) {
 680                 ldata->ld_reclen = (ldata->ld_lee->lee_reclen[0] << 8) |
 681                                    ldata->ld_lee->lee_reclen[1];
 682                 if (unlikely(ldata->ld_reclen == oldlen &&
 683                              memcmp(ldata->ld_lee, oldlee, oldlen) == 0)) {
 684                         repeated++;
 685                         if (!remove)
 686                                 break;
 687
 688                         linkea_del_buf(ldata, cname);
 689                 } else {
 690                         linkea_next_entry(ldata);
 691                 }
 692         }
 693         ldata->ld_lee = oldlee;
 694         ldata->ld_reclen = oldlen;
 695
 696         return repeated;
 697 }
 698
 699 /**
 700  * Insert orphan into .lustre/lost+found/MDTxxxx/ locally.
 701  *
 702  * Add the specified orphan MDT-object to the .lustre/lost+found/MDTxxxx/
 703  * with the given type to generate the name, the detailed rules for name
 704  * have been described as following.
 705  *
 706  * The function also generates the linkEA corresponding to the name entry
 707  * under the .lustre/lost+found/MDTxxxx/ for the orphan MDT-object.
 708  *
 709  * \param[in] env       pointer to the thread context
 710  * \param[in] com       pointer to the lfsck component
 711  * \param[in] orphan    pointer to the orphan MDT-object
 712  * \param[in] infix     additional information for the orphan name, such as
 713  *                      the FID for original
 714  * \param[in] type      the type for describing why the orphan MDT-object is
 715  *                      created. The rules are as following:
 716  *
 717  *  type "D":           The MDT-object is a directory, it may knows its parent
 718  *                      but because there is no valid linkEA, the LFSCK cannot
 719  *                      know where to put it back to the namespace.
 720  *  type "O":           The MDT-object has no linkEA, and there is no name
 721  *                      entry that references the MDT-object.
 722  *
 723  * \see lfsck_layout_recreate_parent() for more types.
 724  *
 725  * The orphan name will be like:
 726  * ${FID}-${infix}-${type}-${conflict_version}
 727  *
 728  * \param[out] count    if some others inserted some linkEA entries by race,
 729  *                      then return the linkEA entries count.
 730  *
 731  * \retval              positive number for repaired cases
 732  * \retval              0 if needs to repair nothing
 733  * \retval              negative error number on failure
 734  */
 735 static int lfsck_namespace_insert_orphan(const struct lu_env *env,
 736                                          struct lfsck_component *com,
 737                                          struct dt_object *orphan,
 738                                          const char *infix, const char *type,
 739                                          int *count)
 740 {
 741         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 742         struct lu_name                  *cname  = &info->lti_name;
 743         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
 744         struct lu_fid                   *tfid   = &info->lti_fid5;
 745         const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
 746         const struct lu_fid             *pfid;
 747         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 748         struct dt_device                *dev    = lfsck->li_bottom;
 749         struct dt_object                *parent;
 750         struct thandle                  *th     = NULL;
 751         struct lustre_handle             plh    = { 0 };
 752         struct lustre_handle             clh    = { 0 };
 753         struct linkea_data               ldata  = { 0 };
 754         struct lu_buf                    linkea_buf;
 755         int                              namelen;
 756         int                              idx    = 0;
 757         int                              rc     = 0;
 758         bool                             exist  = false;
 759         ENTRY;
 760
 761         cname->ln_name = NULL;
 762         /* Create .lustre/lost+found/MDTxxxx when needed. */
 763         if (unlikely(lfsck->li_lpf_obj == NULL)) {
 764                 rc = lfsck_create_lpf(env, lfsck);
 765                 if (rc != 0)
 766                         GOTO(log, rc);
 767         }
 768
 769         parent = lfsck->li_lpf_obj;
 770         pfid = lfsck_dto2fid(parent);
 771
 772         /* Hold update lock on the parent to prevent others to access. */
 773         rc = lfsck_ibits_lock(env, lfsck, parent, &plh,
 774                               MDS_INODELOCK_UPDATE, LCK_EX);
 775         if (rc != 0)
 776                 GOTO(log, rc);
 777
 778         do {
 779                 namelen = snprintf(info->lti_key, NAME_MAX, DFID"%s-%s-%d",
 780                                    PFID(cfid), infix, type, idx++);
 781                 rc = dt_lookup(env, parent, (struct dt_rec *)tfid,
 782                                (const struct dt_key *)info->lti_key,
 783                                BYPASS_CAPA);
 784                 if (rc != 0 && rc != -ENOENT)
 785                         GOTO(log, rc);
 786
 787                 if (unlikely(rc == 0 && lu_fid_eq(cfid, tfid)))
 788                         exist = true;
 789         } while (rc == 0 && !exist);
 790
 791         cname->ln_name = info->lti_key;
 792         cname->ln_namelen = namelen;
 793         rc = linkea_data_new(&ldata, &info->lti_linkea_buf2);
 794         if (rc != 0)
 795                 GOTO(log, rc);
 796
 797         rc = linkea_add_buf(&ldata, cname, pfid);
 798         if (rc != 0)
 799                 GOTO(log, rc);
 800
 801         rc = lfsck_ibits_lock(env, lfsck, orphan, &clh,
 802                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_LOOKUP,
 803                               LCK_EX);
 804         if (rc != 0)
 805                 GOTO(log, rc);
 806
 807         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
 808                        ldata.ld_leh->leh_len);
 809         th = dt_trans_create(env, dev);
 810         if (IS_ERR(th))
 811                 GOTO(log, rc = PTR_ERR(th));
 812
 813         if (S_ISDIR(lfsck_object_type(orphan))) {
 814                 rc = dt_declare_delete(env, orphan,
 815                                        (const struct dt_key *)dotdot, th);
 816                 if (rc != 0)
 817                         GOTO(stop, rc);
 818
 819                 rec->rec_type = S_IFDIR;
 820                 rec->rec_fid = pfid;
 821                 rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
 822                                        (const struct dt_key *)dotdot, th);
 823                 if (rc != 0)
 824                         GOTO(stop, rc);
 825         }
 826
 827         rc = dt_declare_xattr_set(env, orphan, &linkea_buf,
 828                                   XATTR_NAME_LINK, 0, th);
 829         if (rc != 0)
 830                 GOTO(stop, rc);
 831
 832         if (!exist) {
 833                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
 834                 rec->rec_fid = cfid;
 835                 rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
 836                                        (const struct dt_key *)cname->ln_name,
 837                                        th);
 838                 if (rc != 0)
 839                         GOTO(stop, rc);
 840
 841                 if (S_ISDIR(rec->rec_type)) {
 842                         rc = dt_declare_ref_add(env, parent, th);
 843                         if (rc != 0)
 844                                 GOTO(stop, rc);
 845                 }
 846         }
 847
 848         rc = dt_trans_start_local(env, dev, th);
 849         if (rc != 0)
 850                 GOTO(stop, rc);
 851
 852         dt_write_lock(env, orphan, 0);
 853         rc = lfsck_links_read(env, orphan, &ldata);
 854         if (likely((rc == -ENODATA) || (rc == -EINVAL) ||
 855                    (rc == 0 && ldata.ld_leh->leh_reccount == 0))) {
 856                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
 857                         GOTO(unlock, rc = 1);
 858
 859                 if (S_ISDIR(lfsck_object_type(orphan))) {
 860                         rc = dt_delete(env, orphan,
 861                                        (const struct dt_key *)dotdot, th,
 862                                        BYPASS_CAPA);
 863                         if (rc != 0)
 864                                 GOTO(unlock, rc);
 865
 866                         rec->rec_type = S_IFDIR;
 867                         rec->rec_fid = pfid;
 868                         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
 869                                        (const struct dt_key *)dotdot, th,
 870                                        BYPASS_CAPA, 1);
 871                         if (rc != 0)
 872                                 GOTO(unlock, rc);
 873                 }
 874
 875                 rc = dt_xattr_set(env, orphan, &linkea_buf, XATTR_NAME_LINK, 0,
 876                                   th, BYPASS_CAPA);
 877         } else {
 878                 if (rc == 0 && count != NULL)
 879                         *count = ldata.ld_leh->leh_reccount;
 880
 881                 GOTO(unlock, rc);
 882         }
 883         dt_write_unlock(env, orphan);
 884
 885         if (rc == 0 && !exist) {
 886                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
 887                 rec->rec_fid = cfid;
 888                 rc = dt_insert(env, parent, (const struct dt_rec *)rec,
 889                                (const struct dt_key *)cname->ln_name,
 890                                th, BYPASS_CAPA, 1);
 891                 if (rc == 0 && S_ISDIR(rec->rec_type)) {
 892                         dt_write_lock(env, parent, 0);
 893                         rc = dt_ref_add(env, parent, th);
 894                         dt_write_unlock(env, parent);
 895                 }
 896         }
 897
 898         GOTO(stop, rc = (rc == 0 ? 1 : rc));
 899
 900 unlock:
 901         dt_write_unlock(env, orphan);
 902
 903 stop:
 904         dt_trans_stop(env, dev, th);
 905
 906 log:
 907         lfsck_ibits_unlock(&clh, LCK_EX);
 908         lfsck_ibits_unlock(&plh, LCK_EX);
 909         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert orphan for the "
 910                "object "DFID", name = %s: rc = %d\n",
 911                lfsck_lfsck2name(lfsck), PFID(cfid),
 912                cname->ln_name != NULL ? cname->ln_name : "<NULL>", rc);
 913
 914         if (rc != 0) {
 915                 struct lfsck_namespace *ns = com->lc_file_ram;
 916
 917                 ns->ln_flags |= LF_INCONSISTENT;
 918         }
 919
 920         return rc;
 921 }
 922
 923 /**
 924  * Add the specified name entry back to namespace.
 925  *
 926  * If there is a linkEA entry that back references a name entry under
 927  * some parent directory, but such parent directory does not have the
 928  * claimed name entry. On the other hand, the linkEA entries count is
 929  * not larger than the MDT-object's hard link count. Under such case,
 930  * it is quite possible that the name entry is lost. Then the LFSCK
 931  * should add the name entry back to the namespace.
 932  *
 933  * \param[in] env       pointer to the thread context
 934  * \param[in] com       pointer to the lfsck component
 935  * \param[in] parent    pointer to the directory under which the name entry
 936  *                      will be inserted into
 937  * \param[in] child     pointer to the object referenced by the name entry
 938  *                      that to be inserted into the parent
 939  * \param[in] name      the name for the child in the parent directory
 940  *
 941  * \retval              positive number for repaired cases
 942  * \retval              0 if nothing to be repaired
 943  * \retval              negative error number on failure
 944  */
 945 static int lfsck_namespace_insert_normal(const struct lu_env *env,
 946                                          struct lfsck_component *com,
 947                                          struct dt_object *parent,
 948                                          struct dt_object *child,
 949                                          const char *name)
 950 {
 951         struct lfsck_thread_info        *info   = lfsck_env_info(env);
 952         struct lu_attr                  *la     = &info->lti_la;
 953         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
 954         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 955         struct dt_device                *dev    = lfsck->li_next;
 956         struct thandle                  *th     = NULL;
 957         struct lustre_handle             lh     = { 0 };
 958         int                              rc     = 0;
 959         ENTRY;
 960
 961         if (unlikely(!dt_try_as_dir(env, parent)))
 962                 GOTO(log, rc = -ENOTDIR);
 963
 964         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
 965                 GOTO(log, rc = 1);
 966
 967         /* Hold update lock on the parent to prevent others to access. */
 968         rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
 969                               MDS_INODELOCK_UPDATE, LCK_EX);
 970         if (rc != 0)
 971                 GOTO(log, rc);
 972
 973         th = dt_trans_create(env, dev);
 974         if (IS_ERR(th))
 975                 GOTO(unlock, rc = PTR_ERR(th));
 976
 977         rec->rec_type = lfsck_object_type(child) & S_IFMT;
 978         rec->rec_fid = lfsck_dto2fid(child);
 979         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
 980                                (const struct dt_key *)name, th);
 981         if (rc != 0)
 982                 GOTO(stop, rc);
 983
 984         if (S_ISDIR(rec->rec_type)) {
 985                 rc = dt_declare_ref_add(env, parent, th);
 986                 if (rc != 0)
 987                         GOTO(stop, rc);
 988         }
 989
 990         memset(la, 0, sizeof(*la));
 991         la->la_ctime = cfs_time_current_sec();
 992         la->la_valid = LA_CTIME;
 993         rc = dt_declare_attr_set(env, parent, la, th);
 994         if (rc != 0)
 995                 GOTO(stop, rc);
 996
 997         rc = dt_trans_start_local(env, dev, th);
 998         if (rc != 0)
 999                 GOTO(stop, rc);
1000
1001         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1002                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
1003         if (rc != 0)
1004                 GOTO(stop, rc);
1005
1006         if (S_ISDIR(rec->rec_type)) {
1007                 dt_write_lock(env, parent, 0);
1008                 rc = dt_ref_add(env, parent, th);
1009                 dt_write_unlock(env, parent);
1010                 if (rc != 0)
1011                         GOTO(stop, rc);
1012         }
1013
1014         la->la_ctime = cfs_time_current_sec();
1015         rc = dt_attr_set(env, parent, la, th, BYPASS_CAPA);
1016
1017         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1018
1019 stop:
1020         dt_trans_stop(env, dev, th);
1021
1022 unlock:
1023         lfsck_ibits_unlock(&lh, LCK_EX);
1024
1025 log:
1026         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert object "DFID" with "
1027                "the name %s and type %o to the parent "DFID": rc = %d\n",
1028                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(child)), name,
1029                lfsck_object_type(child) & S_IFMT,
1030                PFID(lfsck_dto2fid(parent)), rc);
1031
1032         if (rc != 0) {
1033                 struct lfsck_namespace *ns = com->lc_file_ram;
1034
1035                 ns->ln_flags |= LF_INCONSISTENT;
1036                 if (rc > 0)
1037                         ns->ln_lost_dirent_repaired++;
1038         }
1039
1040         return rc;
1041 }
1042
1043 /**
1044  * Create the specified orphan MDT-object on remote MDT.
1045  *
1046  * The LFSCK instance on this MDT will send LFSCK RPC to remote MDT to
1047  * ask the remote LFSCK instance to create the specified orphan object
1048  * under .lustre/lost+found/MDTxxxx/ directory with the name:
1049  * ${FID}-P-${conflict_version}.
1050  *
1051  * \param[in] env       pointer to the thread context
1052  * \param[in] com       pointer to the lfsck component
1053  * \param[in] orphan    pointer to the orphan MDT-object
1054  * \param[in] type      the orphan's type to be created
1055  *
1056  *  type "P":           The orphan object to be created was a parent directory
1057  *                      of some MDT-object which linkEA shows that the @orphan
1058  *                      object is missing.
1059  *
1060  * \see lfsck_layout_recreate_parent() for more types.
1061  *
1062  * \retval              positive number for repaired cases
1063  * \retval              0 if needs to repair nothing
1064  * \retval              negative error number on failure
1065  */
1066 static int lfsck_namespace_create_orphan_remote(const struct lu_env *env,
1067                                                 struct lfsck_component *com,
1068                                                 struct dt_object *orphan,
1069                                                 __u32 type)
1070 {
1071         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1072         struct lfsck_request            *lr     = &info->lti_lr;
1073         struct lu_seq_range             *range  = &info->lti_range;
1074         const struct lu_fid             *fid    = lfsck_dto2fid(orphan);
1075         struct lfsck_namespace          *ns     = com->lc_file_ram;
1076         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1077         struct seq_server_site          *ss     =
1078                         lu_site2seq(lfsck->li_bottom->dd_lu_dev.ld_site);
1079         struct lfsck_tgt_desc           *ltd    = NULL;
1080         struct ptlrpc_request           *req    = NULL;
1081         int                              rc;
1082         ENTRY;
1083
1084         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1085                 GOTO(out, rc = 1);
1086
1087         fld_range_set_mdt(range);
1088         rc = fld_server_lookup(env, ss->ss_server_fld, fid_seq(fid), range);
1089         if (rc != 0)
1090                 GOTO(out, rc);
1091
1092         ltd = lfsck_tgt_get(&lfsck->li_mdt_descs, range->lsr_index);
1093         if (ltd == NULL) {
1094                 ns->ln_flags |= LF_INCOMPLETE;
1095
1096                 GOTO(out, rc = -ENODEV);
1097         }
1098
1099         req = ptlrpc_request_alloc(class_exp2cliimp(ltd->ltd_exp),
1100                                    &RQF_LFSCK_NOTIFY);
1101         if (req == NULL)
1102                 GOTO(out, rc = -ENOMEM);
1103
1104         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_NOTIFY);
1105         if (rc != 0) {
1106                 ptlrpc_request_free(req);
1107
1108                 GOTO(out, rc);
1109         }
1110
1111         lr = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
1112         memset(lr, 0, sizeof(*lr));
1113         lr->lr_event = LE_CREATE_ORPHAN;
1114         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
1115         lr->lr_active = LFSCK_TYPE_NAMESPACE;
1116         lr->lr_fid = *fid;
1117         lr->lr_type = type;
1118
1119         ptlrpc_request_set_replen(req);
1120         rc = ptlrpc_queue_wait(req);
1121         ptlrpc_req_finished(req);
1122
1123         if (rc == 0)
1124                 rc = 1;
1125         else if (rc == -EEXIST)
1126                 rc = 0;
1127
1128         GOTO(out, rc);
1129
1130 out:
1131         CDEBUG(D_LFSCK, "%s: namespace LFSCK create object "
1132                DFID" on the MDT %x remotely: rc = %d\n",
1133                lfsck_lfsck2name(lfsck), PFID(fid),
1134                ltd != NULL ? ltd->ltd_index : -1, rc);
1135
1136         if (ltd != NULL)
1137                 lfsck_tgt_put(ltd);
1138
1139         return rc;
1140 }
1141
1142 /**
1143  * Create the specified orphan MDT-object locally.
1144  *
1145  * For the case that the parent MDT-object stored in some MDT-object's
1146  * linkEA entry is lost, the LFSCK will re-create the parent object as
1147  * an orphan and insert it into .lustre/lost+found/MDTxxxx/ directory
1148  * with the name ${FID}-P-${conflict_version}.
1149  *
1150  * \param[in] env       pointer to the thread context
1151  * \param[in] com       pointer to the lfsck component
1152  * \param[in] orphan    pointer to the orphan MDT-object to be created
1153  * \param[in] type      the orphan's type to be created
1154  *
1155  *  type "P":           The orphan object to be created was a parent directory
1156  *                      of some MDT-object which linkEA shows that the @orphan
1157  *                      object is missing.
1158  *
1159  * \see lfsck_layout_recreate_parent() for more types.
1160  *
1161  * \retval              positive number for repaired cases
1162  * \retval              negative error number on failure
1163  */
1164 static int lfsck_namespace_create_orphan_local(const struct lu_env *env,
1165                                                struct lfsck_component *com,
1166                                                struct dt_object *orphan,
1167                                                __u32 type)
1168 {
1169         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1170         struct lu_attr                  *la     = &info->lti_la;
1171         struct dt_allocation_hint       *hint   = &info->lti_hint;
1172         struct dt_object_format         *dof    = &info->lti_dof;
1173         struct lu_name                  *cname  = &info->lti_name2;
1174         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1175         struct lu_fid                   *tfid   = &info->lti_fid;
1176         const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
1177         const struct lu_fid             *pfid;
1178         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1179         struct dt_device                *dev    = lfsck->li_bottom;
1180         struct dt_object                *parent = NULL;
1181         struct dt_object                *child  = NULL;
1182         struct thandle                  *th     = NULL;
1183         struct lustre_handle             lh     = { 0 };
1184         struct linkea_data               ldata  = { 0 };
1185         struct lu_buf                    linkea_buf;
1186         char                             name[32];
1187         int                              namelen;
1188         int                              idx    = 0;
1189         int                              rc     = 0;
1190         ENTRY;
1191
1192         LASSERT(!dt_object_exists(orphan));
1193         LASSERT(!dt_object_remote(orphan));
1194
1195         /* @orphan maybe not attached to lfsck->li_bottom */
1196         child = lfsck_object_find_by_dev(env, dev, cfid);
1197         if (IS_ERR(child))
1198                 GOTO(log, rc = PTR_ERR(child));
1199
1200         cname->ln_name = NULL;
1201         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1202                 GOTO(log, rc = 1);
1203
1204         /* Create .lustre/lost+found/MDTxxxx when needed. */
1205         if (unlikely(lfsck->li_lpf_obj == NULL)) {
1206                 rc = lfsck_create_lpf(env, lfsck);
1207                 if (rc != 0)
1208                         GOTO(log, rc);
1209         }
1210
1211         parent = lfsck->li_lpf_obj;
1212         pfid = lfsck_dto2fid(parent);
1213
1214         /* Hold update lock on the parent to prevent others to access. */
1215         rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
1216                               MDS_INODELOCK_UPDATE, LCK_EX);
1217         if (rc != 0)
1218                 GOTO(log, rc);
1219
1220         do {
1221                 namelen = snprintf(name, 31, DFID"-P-%d",
1222                                    PFID(cfid), idx++);
1223                 rc = dt_lookup(env, parent, (struct dt_rec *)tfid,
1224                                (const struct dt_key *)name, BYPASS_CAPA);
1225                 if (rc != 0 && rc != -ENOENT)
1226                         GOTO(unlock1, rc);
1227         } while (rc == 0);
1228
1229         cname->ln_name = name;
1230         cname->ln_namelen = namelen;
1231
1232         memset(la, 0, sizeof(*la));
1233         la->la_mode = type | (S_ISDIR(type) ? 0700 : 0600);
1234         la->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
1235                        LA_ATIME | LA_MTIME | LA_CTIME;
1236
1237         child->do_ops->do_ah_init(env, hint, parent, child,
1238                                   la->la_mode & S_IFMT);
1239
1240         memset(dof, 0, sizeof(*dof));
1241         dof->dof_type = dt_mode_to_dft(type);
1242
1243         rc = linkea_data_new(&ldata, &info->lti_linkea_buf2);
1244         if (rc != 0)
1245                 GOTO(unlock1, rc);
1246
1247         rc = linkea_add_buf(&ldata, cname, pfid);
1248         if (rc != 0)
1249                 GOTO(unlock1, rc);
1250
1251         th = dt_trans_create(env, dev);
1252         if (IS_ERR(th))
1253                 GOTO(unlock1, rc = PTR_ERR(th));
1254
1255         rc = dt_declare_create(env, child, la, hint, dof, th);
1256         if (rc == 0 && S_ISDIR(type))
1257                 rc = dt_declare_ref_add(env, child, th);
1258
1259         if (rc != 0)
1260                 GOTO(stop, rc);
1261
1262         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
1263                        ldata.ld_leh->leh_len);
1264         rc = dt_declare_xattr_set(env, child, &linkea_buf,
1265                                   XATTR_NAME_LINK, 0, th);
1266         if (rc != 0)
1267                 GOTO(stop, rc);
1268
1269         rec->rec_type = type;
1270         rec->rec_fid = cfid;
1271         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1272                                (const struct dt_key *)name, th);
1273         if (rc == 0 && S_ISDIR(type))
1274                 rc = dt_declare_ref_add(env, parent, th);
1275
1276         if (rc != 0)
1277                 GOTO(stop, rc);
1278
1279         rc = dt_trans_start_local(env, dev, th);
1280         if (rc != 0)
1281                 GOTO(stop, rc);
1282
1283         dt_write_lock(env, child, 0);
1284         rc = dt_create(env, child, la, hint, dof, th);
1285         if (rc != 0)
1286                 GOTO(unlock2, rc);
1287
1288         if (S_ISDIR(type)) {
1289                 if (unlikely(!dt_try_as_dir(env, child)))
1290                         GOTO(unlock2, rc = -ENOTDIR);
1291
1292                 rec->rec_type = S_IFDIR;
1293                 rec->rec_fid = cfid;
1294                 rc = dt_insert(env, child, (const struct dt_rec *)rec,
1295                                (const struct dt_key *)dot, th, BYPASS_CAPA, 1);
1296                 if (rc != 0)
1297                         GOTO(unlock2, rc);
1298
1299                 rec->rec_fid = pfid;
1300                 rc = dt_insert(env, child, (const struct dt_rec *)rec,
1301                                (const struct dt_key *)dotdot, th,
1302                                BYPASS_CAPA, 1);
1303                 if (rc != 0)
1304                         GOTO(unlock2, rc);
1305
1306                 rc = dt_ref_add(env, child, th);
1307                 if (rc != 0)
1308                         GOTO(unlock2, rc);
1309         }
1310
1311         rc = dt_xattr_set(env, child, &linkea_buf,
1312                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
1313         dt_write_unlock(env, child);
1314         if (rc != 0)
1315                 GOTO(stop, rc);
1316
1317         rec->rec_type = type;
1318         rec->rec_fid = cfid;
1319         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1320                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
1321         if (rc == 0 && S_ISDIR(type)) {
1322                 dt_write_lock(env, parent, 0);
1323                 rc = dt_ref_add(env, parent, th);
1324                 dt_write_unlock(env, parent);
1325         }
1326
1327         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1328
1329 unlock2:
1330         dt_write_unlock(env, child);
1331
1332 stop:
1333         dt_trans_stop(env, dev, th);
1334
1335 unlock1:
1336         lfsck_ibits_unlock(&lh, LCK_EX);
1337
1338 log:
1339         CDEBUG(D_LFSCK, "%s: namespace LFSCK create orphan locally for "
1340                "the object "DFID", name = %s, type %o: rc = %d\n",
1341                lfsck_lfsck2name(lfsck), PFID(cfid),
1342                cname->ln_name != NULL ? cname->ln_name : "<NULL>", type, rc);
1343
1344         if (child != NULL && !IS_ERR(child))
1345                 lfsck_object_put(env, child);
1346
1347         return rc;
1348 }
1349
1350 /**
1351  * Create the specified orphan MDT-object.
1352  *
1353  * For the case that the parent MDT-object stored in some MDT-object's
1354  * linkEA entry is lost, the LFSCK will re-create the parent object as
1355  * an orphan and insert it into .lustre/lost+found/MDTxxxx/ directory
1356  * with the name: ${FID}-P-${conflict_version}.
1357  *
1358  * \param[in] env       pointer to the thread context
1359  * \param[in] com       pointer to the lfsck component
1360  * \param[in] orphan    pointer to the orphan MDT-object
1361  *
1362  *  type "P":           The orphan object to be created was a parent directory
1363  *                      of some MDT-object which linkEA shows that the @orphan
1364  *                      object is missing.
1365  *
1366  * \see lfsck_layout_recreate_parent() for more types.
1367  *
1368  * \retval              positive number for repaired cases
1369  * \retval              0 if needs to repair nothing
1370  * \retval              negative error number on failure
1371  */
1372 static int lfsck_namespace_create_orphan(const struct lu_env *env,
1373                                          struct lfsck_component *com,
1374                                          struct dt_object *orphan)
1375 {
1376         struct lfsck_namespace *ns = com->lc_file_ram;
1377         int                     rc;
1378
1379         if (dt_object_remote(orphan))
1380                 rc = lfsck_namespace_create_orphan_remote(env, com, orphan,
1381                                                           S_IFDIR);
1382         else
1383                 rc = lfsck_namespace_create_orphan_local(env, com, orphan,
1384                                                          S_IFDIR);
1385
1386         if (rc != 0)
1387                 ns->ln_flags |= LF_INCONSISTENT;
1388
1389         return rc;
1390 }
1391
1392 /**
1393  * Remove the specified entry from the linkEA.
1394  *
1395  * Locate the linkEA entry with the given @cname and @pfid, then
1396  * remove this entry or the other entries those are repeated with
1397  * this entry.
1398  *
1399  * \param[in] env       pointer to the thread context
1400  * \param[in] com       pointer to the lfsck component
1401  * \param[in] obj       pointer to the dt_object to be handled
1402  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
1403  * \param[in] cname     the name for the child in the parent directory
1404  * \param[in] pfid      the parent directory's FID for the linkEA
1405  * \param[in] next      if true, then remove the first found linkEA
1406  *                      entry, and move the ldata->ld_lee to next entry
1407  *
1408  * \retval              positive number for repaired cases
1409  * \retval              0 if nothing to be repaired
1410  * \retval              negative error number on failure
1411  */
1412 static int lfsck_namespace_shrink_linkea(const struct lu_env *env,
1413                                          struct lfsck_component *com,
1414                                          struct dt_object *obj,
1415                                          struct linkea_data *ldata,
1416                                          struct lu_name *cname,
1417                                          struct lu_fid *pfid,
1418                                          bool next)
1419 {
1420         struct lfsck_instance           *lfsck     = com->lc_lfsck;
1421         struct dt_device                *dev       = lfsck->li_bottom;
1422         struct lfsck_bookmark           *bk        = &lfsck->li_bookmark_ram;
1423         struct thandle                  *th        = NULL;
1424         struct lustre_handle             lh        = { 0 };
1425         struct linkea_data               ldata_new = { 0 };
1426         struct lu_buf                    linkea_buf;
1427         int                              rc        = 0;
1428         ENTRY;
1429
1430         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
1431                               MDS_INODELOCK_UPDATE |
1432                               MDS_INODELOCK_XATTR, LCK_EX);
1433         if (rc != 0)
1434                 GOTO(log, rc);
1435
1436         if (next)
1437                 linkea_del_buf(ldata, cname);
1438         else
1439                 lfsck_namespace_filter_linkea_entry(ldata, cname, pfid,
1440                                                     true);
1441         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
1442                        ldata->ld_leh->leh_len);
1443
1444 again:
1445         th = dt_trans_create(env, dev);
1446         if (IS_ERR(th))
1447                 GOTO(unlock1, rc = PTR_ERR(th));
1448
1449         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1450                                   XATTR_NAME_LINK, 0, th);
1451         if (rc != 0)
1452                 GOTO(stop, rc);
1453
1454         rc = dt_trans_start_local(env, dev, th);
1455         if (rc != 0)
1456                 GOTO(stop, rc);
1457
1458         dt_write_lock(env, obj, 0);
1459         if (unlikely(lfsck_is_dead_obj(obj)))
1460                 GOTO(unlock2, rc = -ENOENT);
1461
1462         rc = lfsck_links_read2(env, obj, &ldata_new);
1463         if (rc != 0)
1464                 GOTO(unlock2, rc);
1465
1466         /* The specified linkEA entry has been removed by race. */
1467         rc = linkea_links_find(&ldata_new, cname, pfid);
1468         if (rc != 0)
1469                 GOTO(unlock2, rc = 0);
1470
1471         if (bk->lb_param & LPF_DRYRUN)
1472                 GOTO(unlock2, rc = 1);
1473
1474         if (next)
1475                 linkea_del_buf(&ldata_new, cname);
1476         else
1477                 lfsck_namespace_filter_linkea_entry(&ldata_new, cname, pfid,
1478                                                     true);
1479
1480         if (linkea_buf.lb_len < ldata_new.ld_leh->leh_len) {
1481                 dt_write_unlock(env, obj);
1482                 dt_trans_stop(env, dev, th);
1483                 lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
1484                                ldata_new.ld_leh->leh_len);
1485                 goto again;
1486         }
1487
1488         lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
1489                        ldata_new.ld_leh->leh_len);
1490         rc = dt_xattr_set(env, obj, &linkea_buf,
1491                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
1492
1493         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
1494
1495 unlock2:
1496         dt_write_unlock(env, obj);
1497
1498 stop:
1499         dt_trans_stop(env, dev, th);
1500
1501 unlock1:
1502         lfsck_ibits_unlock(&lh, LCK_EX);
1503
1504 log:
1505         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove %s linkEA entry "
1506                "for the object: "DFID", parent "DFID", name %.*s\n",
1507                lfsck_lfsck2name(lfsck), next ? "invalid" : "redundant",
1508                PFID(lfsck_dto2fid(obj)), PFID(pfid), cname->ln_namelen,
1509                cname->ln_name);
1510
1511         if (rc != 0) {
1512                 struct lfsck_namespace *ns = com->lc_file_ram;
1513
1514                 ns->ln_flags |= LF_INCONSISTENT;
1515         }
1516
1517         return rc;
1518 }
1519
1520 /**
1521  * Conditionally remove the specified entry from the linkEA.
1522  *
1523  * Take the parent lock firstly, then check whether the specified
1524  * name entry exists or not: if yes, do nothing; otherwise, call
1525  * lfsck_namespace_shrink_linkea() to remove the linkea entry.
1526  *
1527  * \param[in] env       pointer to the thread context
1528  * \param[in] com       pointer to the lfsck component
1529  * \param[in] parent    pointer to the parent directory
1530  * \param[in] child     pointer to the child object that holds the linkEA
1531  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
1532  * \param[in] cname     the name for the child in the parent directory
1533  * \param[in] pfid      the parent directory's FID for the linkEA
1534  *
1535  * \retval              positive number for repaired cases
1536  * \retval              0 if nothing to be repaired
1537  * \retval              negative error number on failure
1538  */
1539 static int lfsck_namespace_shrink_linkea_cond(const struct lu_env *env,
1540                                               struct lfsck_component *com,
1541                                               struct dt_object *parent,
1542                                               struct dt_object *child,
1543                                               struct linkea_data *ldata,
1544                                               struct lu_name *cname,
1545                                               struct lu_fid *pfid)
1546 {
1547         struct lu_fid           *cfid   = &lfsck_env_info(env)->lti_fid3;
1548         struct lustre_handle     lh     = { 0 };
1549         int                      rc;
1550         ENTRY;
1551
1552         rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
1553                               MDS_INODELOCK_UPDATE, LCK_EX);
1554         if (rc != 0)
1555                 RETURN(rc);
1556
1557         dt_read_lock(env, parent, 0);
1558         if (unlikely(lfsck_is_dead_obj(parent))) {
1559                 dt_read_unlock(env, parent);
1560                 lfsck_ibits_unlock(&lh, LCK_EX);
1561                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1562                                                    cname, pfid, true);
1563
1564                 RETURN(rc);
1565         }
1566
1567         rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
1568                        (const struct dt_key *)cname->ln_name,
1569                        BYPASS_CAPA);
1570         dt_read_unlock(env, parent);
1571
1572         /* It is safe to release the ldlm lock, because when the logic come
1573          * here, we have got all the needed information above whether the
1574          * linkEA entry is valid or not. It is not important that others
1575          * may add new linkEA entry after the ldlm lock released. If other
1576          * has removed the specified linkEA entry by race, then it is OK,
1577          * because the subsequent lfsck_namespace_shrink_linkea() can handle
1578          * such case. */
1579         lfsck_ibits_unlock(&lh, LCK_EX);
1580         if (rc == -ENOENT) {
1581                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1582                                                    cname, pfid, true);
1583
1584                 RETURN(rc);
1585         }
1586
1587         if (rc != 0)
1588                 RETURN(rc);
1589
1590         /* The LFSCK just found some internal status of cross-MDTs
1591          * create operation. That is normal. */
1592         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
1593                 linkea_next_entry(ldata);
1594
1595                 RETURN(0);
1596         }
1597
1598         rc = lfsck_namespace_shrink_linkea(env, com, child, ldata, cname,
1599                                            pfid, true);
1600
1601         RETURN(rc);
1602 }
1603
1604 /**
1605  * Conditionally replace name entry in the parent.
1606  *
1607  * As required, the LFSCK may re-create the lost MDT-object for dangling
1608  * name entry, but such repairing may be wrong because of bad FID in the
1609  * name entry. As the LFSCK processing, the real MDT-object may be found,
1610  * then the LFSCK should check whether the former re-created MDT-object
1611  * has been modified or not, if not, then destroy it and update the name
1612  * entry in the parent to reference the real MDT-object.
1613  *
1614  * \param[in] env       pointer to the thread context
1615  * \param[in] com       pointer to the lfsck component
1616  * \param[in] parent    pointer to the parent directory
1617  * \param[in] child     pointer to the MDT-object that may be the real
1618  *                      MDT-object corresponding to the name entry in parent
1619  * \param[in] cfid      the current FID in the name entry
1620  * \param[in] cname     contains the name of the child in the parent directory
1621  *
1622  * \retval              positive number for repaired cases
1623  * \retval              0 if nothing to be repaired
1624  * \retval              negative error number on failure
1625  */
1626 static int lfsck_namespace_replace_cond(const struct lu_env *env,
1627                                         struct lfsck_component *com,
1628                                         struct dt_object *parent,
1629                                         struct dt_object *child,
1630                                         const struct lu_fid *cfid,
1631                                         const struct lu_name *cname)
1632 {
1633         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1634         struct lu_fid                   *tfid   = &info->lti_fid5;
1635         struct lu_attr                  *la     = &info->lti_la;
1636         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1637         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1638         struct dt_device                *dev    = lfsck->li_next;
1639         const char                      *name   = cname->ln_name;
1640         struct dt_object                *obj    = NULL;
1641         struct lustre_handle             plh    = { 0 };
1642         struct lustre_handle             clh    = { 0 };
1643         struct linkea_data               ldata  = { 0 };
1644         struct thandle                  *th     = NULL;
1645         bool                             exist  = true;
1646         int                              rc     = 0;
1647         ENTRY;
1648
1649         rc = lfsck_ibits_lock(env, lfsck, parent, &plh,
1650                               MDS_INODELOCK_UPDATE, LCK_EX);
1651         if (rc != 0)
1652                 GOTO(log, rc);
1653
1654         if (!fid_is_sane(cfid)) {
1655                 exist = false;
1656                 goto replace;
1657         }
1658
1659         obj = lfsck_object_find(env, lfsck, cfid);
1660         if (IS_ERR(obj)) {
1661                 rc = PTR_ERR(obj);
1662                 if (rc == -ENOENT) {
1663                         exist = false;
1664                         goto replace;
1665                 }
1666
1667                 GOTO(log, rc);
1668         }
1669
1670         if (!dt_object_exists(obj)) {
1671                 exist = false;
1672                 goto replace;
1673         }
1674
1675         rc = dt_lookup(env, parent, (struct dt_rec *)tfid,
1676                        (const struct dt_key *)name, BYPASS_CAPA);
1677         if (rc == -ENOENT) {
1678                 exist = false;
1679                 goto replace;
1680         }
1681
1682         if (rc != 0)
1683                 GOTO(log, rc);
1684
1685         /* Someone changed the name entry, cannot replace it. */
1686         if (!lu_fid_eq(cfid, tfid))
1687                 GOTO(log, rc = 0);
1688
1689         /* lock the object to be destroyed. */
1690         rc = lfsck_ibits_lock(env, lfsck, obj, &clh,
1691                               MDS_INODELOCK_UPDATE |
1692                               MDS_INODELOCK_XATTR, LCK_EX);
1693         if (rc != 0)
1694                 GOTO(log, rc);
1695
1696         if (unlikely(lfsck_is_dead_obj(obj))) {
1697                 exist = false;
1698                 goto replace;
1699         }
1700
1701         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
1702         if (rc != 0)
1703                 GOTO(log, rc);
1704
1705         /* The object has been modified by other(s), or it is not created by
1706          * LFSCK, the two cases are indistinguishable. So cannot replace it. */
1707         if (la->la_ctime != 0)
1708                 GOTO(log, rc);
1709
1710         if (S_ISREG(la->la_mode)) {
1711                 rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LOV,
1712                                   BYPASS_CAPA);
1713                 /* If someone has created related OST-object(s),
1714                  * then keep it. */
1715                 if ((rc > 0) || (rc < 0 && rc != -ENODATA))
1716                         GOTO(log, rc = (rc > 0 ? 0 : rc));
1717         }
1718
1719 replace:
1720         dt_read_lock(env, child, 0);
1721         rc = lfsck_links_read2(env, child, &ldata);
1722         dt_read_unlock(env, child);
1723
1724         /* Someone changed the child, no need to replace. */
1725         if (rc == -ENODATA)
1726                 GOTO(log, rc = 0);
1727
1728         if (rc != 0)
1729                 GOTO(log, rc);
1730
1731         rc = linkea_links_find(&ldata, cname, lfsck_dto2fid(parent));
1732         /* Someone moved the child, no need to replace. */
1733         if (rc != 0)
1734                 GOTO(log, rc = 0);
1735
1736         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1737                 GOTO(log, rc = 1);
1738
1739         th = dt_trans_create(env, dev);
1740         if (IS_ERR(th))
1741                 GOTO(log, rc = PTR_ERR(th));
1742
1743         if (exist) {
1744                 rc = dt_declare_destroy(env, obj, th);
1745                 if (rc != 0)
1746                         GOTO(stop, rc);
1747         }
1748
1749         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
1750         if (rc != 0)
1751                 GOTO(stop, rc);
1752
1753         rec->rec_type = S_IFDIR;
1754         rec->rec_fid = lfsck_dto2fid(child);
1755         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1756                                (const struct dt_key *)name, th);
1757         if (rc != 0)
1758                 GOTO(stop, rc);
1759
1760         rc = dt_trans_start(env, dev, th);
1761         if (rc != 0)
1762                 GOTO(stop, rc);
1763
1764         if (exist) {
1765                 rc = dt_destroy(env, obj, th);
1766                 if (rc != 0)
1767                         GOTO(stop, rc);
1768         }
1769
1770         /* The old name entry maybe not exist. */
1771         dt_delete(env, parent, (const struct dt_key *)name, th,
1772                   BYPASS_CAPA);
1773
1774         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1775                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
1776
1777         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1778
1779 stop:
1780         dt_trans_stop(env, dev, th);
1781
1782 log:
1783         lfsck_ibits_unlock(&clh, LCK_EX);
1784         lfsck_ibits_unlock(&plh, LCK_EX);
1785         if (obj != NULL && !IS_ERR(obj))
1786                 lfsck_object_put(env, obj);
1787
1788         CDEBUG(D_LFSCK, "%s: namespace LFSCK conditionally destroy the "
1789                "object "DFID" because of conflict with the object "DFID
1790                " under the parent "DFID" with name %s: rc = %d\n",
1791                lfsck_lfsck2name(lfsck), PFID(cfid),
1792                PFID(lfsck_dto2fid(child)), PFID(lfsck_dto2fid(parent)),
1793                name, rc);
1794
1795         return rc;
1796 }
1797
1798 /**
1799  * Overwrite the linkEA for the object with the given ldata.
1800  *
1801  * The caller should take the ldlm lock before the calling.
1802  *
1803  * \param[in] env       pointer to the thread context
1804  * \param[in] com       pointer to the lfsck component
1805  * \param[in] obj       pointer to the dt_object to be handled
1806  * \param[in] ldata     pointer to the new linkEA data
1807  *
1808  * \retval              positive number for repaired cases
1809  * \retval              0 if nothing to be repaired
1810  * \retval              negative error number on failure
1811  */
1812 int lfsck_namespace_rebuild_linkea(const struct lu_env *env,
1813                                    struct lfsck_component *com,
1814                                    struct dt_object *obj,
1815                                    struct linkea_data *ldata)
1816 {
1817         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1818         struct dt_device                *dev    = lfsck->li_bottom;
1819         struct thandle                  *th     = NULL;
1820         struct lu_buf                    linkea_buf;
1821         int                              rc     = 0;
1822         ENTRY;
1823
1824         LASSERT(!dt_object_remote(obj));
1825
1826         th = dt_trans_create(env, dev);
1827         if (IS_ERR(th))
1828                 GOTO(log, rc = PTR_ERR(th));
1829
1830         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
1831                        ldata->ld_leh->leh_len);
1832         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1833                                   XATTR_NAME_LINK, 0, th);
1834         if (rc != 0)
1835                 GOTO(stop, rc);
1836
1837         rc = dt_trans_start_local(env, dev, th);
1838         if (rc != 0)
1839                 GOTO(stop, rc);
1840
1841         dt_write_lock(env, obj, 0);
1842         if (unlikely(lfsck_is_dead_obj(obj)))
1843                 GOTO(unlock, rc = 0);
1844
1845         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1846                 GOTO(unlock, rc = 1);
1847
1848         rc = dt_xattr_set(env, obj, &linkea_buf,
1849                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
1850
1851         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
1852
1853 unlock:
1854         dt_write_unlock(env, obj);
1855
1856 stop:
1857         dt_trans_stop(env, dev, th);
1858
1859 log:
1860         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild linkEA for the "
1861                "object "DFID": rc = %d\n",
1862                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
1863
1864         if (rc != 0) {
1865                 struct lfsck_namespace *ns = com->lc_file_ram;
1866
1867                 ns->ln_flags |= LF_INCONSISTENT;
1868         }
1869
1870         return rc;
1871 }
1872
1873 /**
1874  * Repair invalid name entry.
1875  *
1876  * If the name entry contains invalid information, such as bad file type
1877  * or (and) corrupted object FID, then either remove the name entry or
1878  * udpate the name entry with the given (right) information.
1879  *
1880  * \param[in] env       pointer to the thread context
1881  * \param[in] com       pointer to the lfsck component
1882  * \param[in] parent    pointer to the parent directory
1883  * \param[in] child     pointer to the object referenced by the name entry
1884  * \param[in] name      the old name of the child under the parent directory
1885  * \param[in] name2     the new name of the child under the parent directory
1886  * \param[in] type      the type claimed by the name entry
1887  * \param[in] update    update the name entry if true; otherwise, remove it
1888  * \param[in] dec       decrease the parent nlink count if true
1889  *
1890  * \retval              positive number for repaired successfully
1891  * \retval              0 if nothing to be repaired
1892  * \retval              negative error number on failure
1893  */
1894 int lfsck_namespace_repair_dirent(const struct lu_env *env,
1895                                   struct lfsck_component *com,
1896                                   struct dt_object *parent,
1897                                   struct dt_object *child,
1898                                   const char *name, const char *name2,
1899                                   __u16 type, bool update, bool dec)
1900 {
1901         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1902         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1903         const struct lu_fid             *cfid   = lfsck_dto2fid(child);
1904         struct lu_fid                   *tfid   = &info->lti_fid5;
1905         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1906         struct dt_device                *dev    = lfsck->li_next;
1907         struct thandle                  *th     = NULL;
1908         struct lustre_handle             lh     = { 0 };
1909         int                              rc     = 0;
1910         ENTRY;
1911
1912         if (unlikely(!dt_try_as_dir(env, parent)))
1913                 GOTO(log, rc = -ENOTDIR);
1914
1915         rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
1916                               MDS_INODELOCK_UPDATE, LCK_EX);
1917         if (rc != 0)
1918                 GOTO(log, rc);
1919
1920         th = dt_trans_create(env, dev);
1921         if (IS_ERR(th))
1922                 GOTO(unlock1, rc = PTR_ERR(th));
1923
1924         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
1925         if (rc != 0)
1926                 GOTO(stop, rc);
1927
1928         if (update) {
1929                 rec->rec_type = lfsck_object_type(child) & S_IFMT;
1930                 rec->rec_fid = cfid;
1931                 rc = dt_declare_insert(env, parent,
1932                                        (const struct dt_rec *)rec,
1933                                        (const struct dt_key *)name2, th);
1934                 if (rc != 0)
1935                         GOTO(stop, rc);
1936         }
1937
1938         if (dec) {
1939                 rc = dt_declare_ref_del(env, parent, th);
1940                 if (rc != 0)
1941                         GOTO(stop, rc);
1942         }
1943
1944         rc = dt_trans_start(env, dev, th);
1945         if (rc != 0)
1946                 GOTO(stop, rc);
1947
1948         dt_write_lock(env, parent, 0);
1949         rc = dt_lookup(env, parent, (struct dt_rec *)tfid,
1950                        (const struct dt_key *)name, BYPASS_CAPA);
1951         /* Someone has removed the bad name entry by race. */
1952         if (rc == -ENOENT)
1953                 GOTO(unlock2, rc = 0);
1954
1955         if (rc != 0)
1956                 GOTO(unlock2, rc);
1957
1958         /* Someone has removed the bad name entry and reused it for other
1959          * object by race. */
1960         if (!lu_fid_eq(tfid, cfid))
1961                 GOTO(unlock2, rc = 0);
1962
1963         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1964                 GOTO(unlock2, rc = 1);
1965
1966         rc = dt_delete(env, parent, (const struct dt_key *)name, th,
1967                        BYPASS_CAPA);
1968         if (rc != 0)
1969                 GOTO(unlock2, rc);
1970
1971         if (update) {
1972                 rc = dt_insert(env, parent,
1973                                (const struct dt_rec *)rec,
1974                                (const struct dt_key *)name2, th,
1975                                BYPASS_CAPA, 1);
1976                 if (rc != 0)
1977                         GOTO(unlock2, rc);
1978         }
1979
1980         if (dec) {
1981                 rc = dt_ref_del(env, parent, th);
1982                 if (rc != 0)
1983                         GOTO(unlock2, rc);
1984         }
1985
1986         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
1987
1988 unlock2:
1989         dt_write_unlock(env, parent);
1990
1991 stop:
1992         dt_trans_stop(env, dev, th);
1993
1994         /* We are not sure whether the child will become orphan or not.
1995          * Record it in the LFSCK tracing file for further checking in
1996          * the second-stage scanning. */
1997         if (!update && !dec && rc == 0)
1998                 lfsck_namespace_trace_update(env, com, cfid,
1999                                              LNTF_CHECK_LINKEA, true);
2000
2001 unlock1:
2002         lfsck_ibits_unlock(&lh, LCK_EX);
2003
2004 log:
2005         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found bad name "
2006                "entry for: parent "DFID", child "DFID", name %s, type "
2007                "in name entry %o, type claimed by child %o. repair it "
2008                "by %s with new name2 %s: rc = %d\n", lfsck_lfsck2name(lfsck),
2009                PFID(lfsck_dto2fid(parent)), PFID(lfsck_dto2fid(child)),
2010                name, type, update ? lfsck_object_type(child) : 0,
2011                update ? "updating" : "removing", name2, rc);
2012
2013         if (rc != 0) {
2014                 struct lfsck_namespace *ns = com->lc_file_ram;
2015
2016                 ns->ln_flags |= LF_INCONSISTENT;
2017         }
2018
2019         return rc;
2020 }
2021
2022 /**
2023  * Update the ".." name entry for the given object.
2024  *
2025  * The object's ".." is corrupted, this function will update the ".." name
2026  * entry with the given pfid, and the linkEA with the given ldata.
2027  *
2028  * The caller should take the ldlm lock before the calling.
2029  *
2030  * \param[in] env       pointer to the thread context
2031  * \param[in] com       pointer to the lfsck component
2032  * \param[in] obj       pointer to the dt_object to be handled
2033  * \param[in] pfid      the new fid for the object's ".." name entry
2034  * \param[in] cname     the name for the @obj in the parent directory
2035  *
2036  * \retval              positive number for repaired cases
2037  * \retval              0 if nothing to be repaired
2038  * \retval              negative error number on failure
2039  */
2040 static int lfsck_namespace_repair_unmatched_pairs(const struct lu_env *env,
2041                                                   struct lfsck_component *com,
2042                                                   struct dt_object *obj,
2043                                                   const struct lu_fid *pfid,
2044                                                   struct lu_name *cname)
2045 {
2046         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2047         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
2048         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2049         struct dt_device                *dev    = lfsck->li_bottom;
2050         struct thandle                  *th     = NULL;
2051         struct linkea_data               ldata  = { 0 };
2052         struct lu_buf                    linkea_buf;
2053         int                              rc     = 0;
2054         ENTRY;
2055
2056         LASSERT(!dt_object_remote(obj));
2057         LASSERT(S_ISDIR(lfsck_object_type(obj)));
2058
2059         rc = linkea_data_new(&ldata, &info->lti_big_buf);
2060         if (rc != 0)
2061                 GOTO(log, rc);
2062
2063         rc = linkea_add_buf(&ldata, cname, pfid);
2064         if (rc != 0)
2065                 GOTO(log, rc);
2066
2067         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
2068                        ldata.ld_leh->leh_len);
2069
2070         th = dt_trans_create(env, dev);
2071         if (IS_ERR(th))
2072                 GOTO(log, rc = PTR_ERR(th));
2073
2074         rc = dt_declare_delete(env, obj, (const struct dt_key *)dotdot, th);
2075         if (rc != 0)
2076                 GOTO(stop, rc);
2077
2078         rec->rec_type = S_IFDIR;
2079         rec->rec_fid = pfid;
2080         rc = dt_declare_insert(env, obj, (const struct dt_rec *)rec,
2081                                (const struct dt_key *)dotdot, th);
2082         if (rc != 0)
2083                 GOTO(stop, rc);
2084
2085         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
2086                                   XATTR_NAME_LINK, 0, th);
2087         if (rc != 0)
2088                 GOTO(stop, rc);
2089
2090         rc = dt_trans_start_local(env, dev, th);
2091         if (rc != 0)
2092                 GOTO(stop, rc);
2093
2094         dt_write_lock(env, obj, 0);
2095         if (unlikely(lfsck_is_dead_obj(obj)))
2096                 GOTO(unlock, rc = 0);
2097
2098         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2099                 GOTO(unlock, rc = 1);
2100
2101         /* The old ".." name entry maybe not exist. */
2102         dt_delete(env, obj, (const struct dt_key *)dotdot, th,
2103                   BYPASS_CAPA);
2104
2105         rc = dt_insert(env, obj, (const struct dt_rec *)rec,
2106                        (const struct dt_key *)dotdot, th, BYPASS_CAPA, 1);
2107         if (rc != 0)
2108                 GOTO(unlock, rc);
2109
2110         rc = dt_xattr_set(env, obj, &linkea_buf,
2111                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
2112
2113         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2114
2115 unlock:
2116         dt_write_unlock(env, obj);
2117
2118 stop:
2119         dt_trans_stop(env, dev, th);
2120
2121 log:
2122         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild dotdot name entry for "
2123                "the object "DFID", new parent "DFID": rc = %d\n",
2124                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)),
2125                PFID(pfid), rc);
2126
2127         if (rc != 0) {
2128                 struct lfsck_namespace *ns = com->lc_file_ram;
2129
2130                 ns->ln_flags |= LF_INCONSISTENT;
2131         }
2132
2133         return rc;
2134 }
2135
2136 /**
2137  * Handle orphan @obj during Double Scan Directory.
2138  *
2139  * Remove the @obj's current (invalid) linkEA entries, and insert
2140  * it in the directory .lustre/lost+found/MDTxxxx/ with the name:
2141  * ${FID}-${PFID}-D-${conflict_version}
2142  *
2143  * The caller should take the ldlm lock before the calling.
2144  *
2145  * \param[in] env       pointer to the thread context
2146  * \param[in] com       pointer to the lfsck component
2147  * \param[in] obj       pointer to the orphan object to be handled
2148  * \param[in] pfid      the new fid for the object's ".." name entry
2149  * \param[in,out] lh    ldlm lock handler for the given @obj
2150  * \param[out] type     to tell the caller what the inconsistency is
2151  *
2152  * \retval              positive number for repaired cases
2153  * \retval              0 if nothing to be repaired
2154  * \retval              negative error number on failure
2155  */
2156 static int
2157 lfsck_namespace_dsd_orphan(const struct lu_env *env,
2158                            struct lfsck_component *com,
2159                            struct dt_object *obj,
2160                            const struct lu_fid *pfid,
2161                            struct lustre_handle *lh,
2162                            enum lfsck_namespace_inconsistency_type *type)
2163 {
2164         struct lfsck_thread_info *info = lfsck_env_info(env);
2165         struct lfsck_namespace   *ns   = com->lc_file_ram;
2166         int                       rc;
2167         ENTRY;
2168
2169         /* Remove the unrecognized linkEA. */
2170         rc = lfsck_namespace_links_remove(env, com, obj);
2171         lfsck_ibits_unlock(lh, LCK_EX);
2172         if (rc < 0 && rc != -ENODATA)
2173                 RETURN(rc);
2174
2175         *type = LNIT_MUL_REF;
2176
2177         /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT has
2178          * ever tried to verify some remote MDT-object that resides on this
2179          * MDT, but this MDT failed to respond such request. So means there
2180          * may be some remote name entry on other MDT that references this
2181          * object with another name, so we cannot know whether this linkEA
2182          * is valid or not. So keep it there and maybe resolved when next
2183          * LFSCK run. */
2184         if (ns->ln_flags & LF_INCOMPLETE)
2185                 RETURN(0);
2186
2187         /* The unique linkEA is invalid, even if the ".." name entry may be
2188          * valid, we still cannot know via which name entry this directory
2189          * will be referenced. Then handle it as pure orphan. */
2190         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2191                  "-"DFID, PFID(pfid));
2192         rc = lfsck_namespace_insert_orphan(env, com, obj,
2193                                            info->lti_tmpbuf, "D", NULL);
2194
2195         RETURN(rc);
2196 }
2197
2198 /**
2199  * Double Scan Directory object for single linkEA entry case.
2200  *
2201  * The given @child has unique linkEA entry. If the linkEA entry is valid,
2202  * then check whether the name is in the namespace or not, if not, add the
2203  * missing name entry back to namespace. If the linkEA entry is invalid,
2204  * then remove it and insert the @child in the .lustre/lost+found/MDTxxxx/
2205  * as an orphan.
2206  *
2207  * \param[in] env       pointer to the thread context
2208  * \param[in] com       pointer to the lfsck component
2209  * \param[in] child     pointer to the directory to be double scanned
2210  * \param[in] pfid      the FID corresponding to the ".." entry
2211  * \param[in] ldata     pointer to the linkEA data for the given @child
2212  * \param[in,out] lh    ldlm lock handler for the given @child
2213  * \param[out] type     to tell the caller what the inconsistency is
2214  * \param[in] retry     if found inconsistency, but the caller does not hold
2215  *                      ldlm lock on the @child, then set @retry as true
2216  *
2217  * \retval              positive number for repaired cases
2218  * \retval              0 if nothing to be repaired
2219  * \retval              negative error number on failure
2220  */
2221 static int
2222 lfsck_namespace_dsd_single(const struct lu_env *env,
2223                            struct lfsck_component *com,
2224                            struct dt_object *child,
2225                            const struct lu_fid *pfid,
2226                            struct linkea_data *ldata,
2227                            struct lustre_handle *lh,
2228                            enum lfsck_namespace_inconsistency_type *type,
2229                            bool *retry)
2230 {
2231         struct lfsck_thread_info *info          = lfsck_env_info(env);
2232         struct lu_name           *cname         = &info->lti_name;
2233         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2234         struct lu_fid            *tfid          = &info->lti_fid3;
2235         struct lfsck_namespace   *ns            = com->lc_file_ram;
2236         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2237         struct dt_object         *parent        = NULL;
2238         int                       rc            = 0;
2239         ENTRY;
2240
2241         lfsck_namespace_unpack_linkea_entry(ldata, cname, tfid, info->lti_key);
2242         /* The unique linkEA entry with bad parent will be handled as orphan. */
2243         if (!fid_is_sane(tfid)) {
2244                 if (!lustre_handle_is_used(lh) && retry != NULL)
2245                         *retry = true;
2246                 else
2247                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2248                                                         pfid, lh, type);
2249
2250                 GOTO(out, rc);
2251         }
2252
2253         parent = lfsck_object_find_bottom(env, lfsck, tfid);
2254         if (IS_ERR(parent))
2255                 GOTO(out, rc = PTR_ERR(parent));
2256
2257         /* We trust the unique linkEA entry in spite of whether it matches the
2258          * ".." name entry or not. Because even if the linkEA entry is wrong
2259          * and the ".." name entry is right, we still cannot know via which
2260          * name entry the child will be referenced, since all known entries
2261          * have been verified during the first-stage scanning. */
2262         if (!dt_object_exists(parent)) {
2263                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT
2264                  * has ever tried to verify some remote MDT-object that resides
2265                  * on this MDT, but this MDT failed to respond such request. So
2266                  * means there may be some remote name entry on other MDT that
2267                  * references this object with another name, so we cannot know
2268                  * whether this linkEA is valid or not. So keep it there and
2269                  * maybe resolved when next LFSCK run. */
2270                 if (ns->ln_flags & LF_INCOMPLETE)
2271                         GOTO(out, rc = 0);
2272
2273                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2274                         *retry = true;
2275
2276                         GOTO(out, rc = 0);
2277                 }
2278
2279                 lfsck_ibits_unlock(lh, LCK_EX);
2280
2281 lost_parent:
2282                 /* Create the lost parent as an orphan. */
2283                 rc = lfsck_namespace_create_orphan(env, com, parent);
2284                 if (rc >= 0) {
2285                         /* Add the missing name entry to the parent. */
2286                         rc = lfsck_namespace_insert_normal(env, com, parent,
2287                                                         child, cname->ln_name);
2288                         if (unlikely(rc == -EEXIST)) {
2289                                 /* Unfortunately, someone reused the name
2290                                  * under the parent by race. So we have
2291                                  * to remove the linkEA entry from
2292                                  * current child object. It means that the
2293                                  * LFSCK cannot recover the system
2294                                  * totally back to its original status,
2295                                  * but it is necessary to make the
2296                                  * current system to be consistent. */
2297                                 rc = lfsck_namespace_shrink_linkea(env,
2298                                                 com, child, ldata,
2299                                                 cname, tfid, true);
2300                                 if (rc >= 0) {
2301                                         snprintf(info->lti_tmpbuf,
2302                                                  sizeof(info->lti_tmpbuf),
2303                                                  "-"DFID, PFID(pfid));
2304                                         rc = lfsck_namespace_insert_orphan(env,
2305                                                 com, child, info->lti_tmpbuf,
2306                                                 "D", NULL);
2307                                 }
2308                         }
2309                 }
2310
2311                 GOTO(out, rc);
2312         }
2313
2314         /* The unique linkEA entry with bad parent will be handled as orphan. */
2315         if (unlikely(!dt_try_as_dir(env, parent))) {
2316                 if (!lustre_handle_is_used(lh) && retry != NULL)
2317                         *retry = true;
2318                 else
2319                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2320                                                         pfid, lh, type);
2321
2322                 GOTO(out, rc);
2323         }
2324
2325         rc = dt_lookup(env, parent, (struct dt_rec *)tfid,
2326                        (const struct dt_key *)cname->ln_name, BYPASS_CAPA);
2327         if (rc == -ENOENT) {
2328                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT
2329                  * has ever tried to verify some remote MDT-object that resides
2330                  * on this MDT, but this MDT failed to respond such request. So
2331                  * means there may be some remote name entry on other MDT that
2332                  * references this object with another name, so we cannot know
2333                  * whether this linkEA is valid or not. So keep it there and
2334                  * maybe resolved when next LFSCK run. */
2335                 if (ns->ln_flags & LF_INCOMPLETE)
2336                         GOTO(out, rc = 0);
2337
2338                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2339                         *retry = true;
2340
2341                         GOTO(out, rc = 0);
2342                 }
2343
2344                 lfsck_ibits_unlock(lh, LCK_EX);
2345                 /* Add the missing name entry back to the namespace. */
2346                 rc = lfsck_namespace_insert_normal(env, com, parent, child,
2347                                                    cname->ln_name);
2348                 if (unlikely(rc == -ESTALE))
2349                         /* It may happen when the remote object has been
2350                          * removed, but the local MDT is not aware of that. */
2351                         goto lost_parent;
2352
2353                 if (unlikely(rc == -EEXIST)) {
2354                         /* Unfortunately, someone reused the name under the
2355                          * parent by race. So we have to remove the linkEA
2356                          * entry from current child object. It means that the
2357                          * LFSCK cannot recover the system totally back to
2358                          * its original status, but it is necessary to make
2359                          * the current system to be consistent.
2360                          *
2361                          * It also may be because of the LFSCK found some
2362                          * internal status of create operation. Under such
2363                          * case, nothing to be done. */
2364                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
2365                                         parent, child, ldata, cname, tfid);
2366                         if (rc >= 0) {
2367                                 snprintf(info->lti_tmpbuf,
2368                                          sizeof(info->lti_tmpbuf),
2369                                          "-"DFID, PFID(pfid));
2370                                 rc = lfsck_namespace_insert_orphan(env, com,
2371                                         child, info->lti_tmpbuf, "D", NULL);
2372                         }
2373                 }
2374
2375                 GOTO(out, rc);
2376         }
2377
2378         if (rc != 0)
2379                 GOTO(out, rc);
2380
2381         if (!lu_fid_eq(tfid, cfid)) {
2382                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2383                         *retry = true;
2384
2385                         GOTO(out, rc = 0);
2386                 }
2387
2388                 lfsck_ibits_unlock(lh, LCK_EX);
2389                 /* The name entry references another MDT-object that
2390                  * may be created by the LFSCK for repairing dangling
2391                  * name entry. Try to replace it. */
2392                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
2393                                                   tfid, cname);
2394                 if (rc == 0)
2395                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2396                                                         pfid, lh, type);
2397
2398                 GOTO(out, rc);
2399         }
2400
2401         /* The ".." name entry is wrong, update it. */
2402         if (!lu_fid_eq(pfid, lfsck_dto2fid(parent))) {
2403                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2404                         *retry = true;
2405
2406                         GOTO(out, rc = 0);
2407                 }
2408
2409                 *type = LNIT_UNMATCHED_PAIRS;
2410                 rc = lfsck_namespace_repair_unmatched_pairs(env, com, child,
2411                                                 lfsck_dto2fid(parent), cname);
2412         }
2413
2414         GOTO(out, rc);
2415
2416 out:
2417         if (parent != NULL && !IS_ERR(parent))
2418                 lfsck_object_put(env, parent);
2419
2420         return rc;
2421 }
2422
2423 /**
2424  * Double Scan Directory object for multiple linkEA entries case.
2425  *
2426  * The given @child has multiple linkEA entries. There is at most one linkEA
2427  * entry will be valid, all the others will be removed. Firstly, the function
2428  * will try to find out the linkEA entry for which the name entry exists under
2429  * the given parent (@pfid). If there is no linkEA entry that matches the given
2430  * ".." name entry, then tries to find out the first linkEA entry that both the
2431  * parent and the name entry exist to rebuild a new ".." name entry.
2432  *
2433  * \param[in] env       pointer to the thread context
2434  * \param[in] com       pointer to the lfsck component
2435  * \param[in] child     pointer to the directory to be double scanned
2436  * \param[in] pfid      the FID corresponding to the ".." entry
2437  * \param[in] ldata     pointer to the linkEA data for the given @child
2438  * \param[in,out] lh    ldlm lock handler for the given @child
2439  * \param[out] type     to tell the caller what the inconsistency is
2440  * \param[in] lpf       true if the ".." entry is under lost+found/MDTxxxx/
2441  *
2442  * \retval              positive number for repaired cases
2443  * \retval              0 if nothing to be repaired
2444  * \retval              negative error number on failure
2445  */
2446 static int
2447 lfsck_namespace_dsd_multiple(const struct lu_env *env,
2448                              struct lfsck_component *com,
2449                              struct dt_object *child,
2450                              const struct lu_fid *pfid,
2451                              struct linkea_data *ldata,
2452                              struct lustre_handle *lh,
2453                              enum lfsck_namespace_inconsistency_type *type,
2454                              bool lpf)
2455 {
2456         struct lfsck_thread_info *info          = lfsck_env_info(env);
2457         struct lu_name           *cname         = &info->lti_name;
2458         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2459         struct lu_fid            *tfid          = &info->lti_fid3;
2460         struct lu_fid            *pfid2         = &info->lti_fid4;
2461         struct lfsck_namespace   *ns            = com->lc_file_ram;
2462         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2463         struct lfsck_bookmark    *bk            = &lfsck->li_bookmark_ram;
2464         struct dt_object         *parent        = NULL;
2465         struct linkea_data        ldata_new     = { 0 };
2466         int                       count         = 0;
2467         int                       rc            = 0;
2468         bool                      once          = true;
2469         ENTRY;
2470
2471 again:
2472         while (ldata->ld_lee != NULL) {
2473                 lfsck_namespace_unpack_linkea_entry(ldata, cname, tfid,
2474                                                     info->lti_key);
2475                 /* Drop repeated linkEA entries. */
2476                 lfsck_namespace_filter_linkea_entry(ldata, cname, tfid, true);
2477                 /* Drop invalid linkEA entry. */
2478                 if (!fid_is_sane(tfid)) {
2479                         linkea_del_buf(ldata, cname);
2480                         continue;
2481                 }
2482
2483                 /* If current dotdot is the .lustre/lost+found/MDTxxxx/,
2484                  * then it is possible that: the directry object has ever
2485                  * been lost, but its name entry was there. In the former
2486                  * LFSCK run, during the first-stage scanning, the LFSCK
2487                  * found the dangling name entry, but it did not recreate
2488                  * the lost object, and when moved to the second-stage
2489                  * scanning, some children objects of the lost directory
2490                  * object were found, then the LFSCK recreated such lost
2491                  * directory object as an orphan.
2492                  *
2493                  * When the LFSCK runs again, if the dangling name is still
2494                  * there, the LFSCK should move the orphan directory object
2495                  * back to the normal namespace. */
2496                 if (!lpf && !lu_fid_eq(pfid, tfid) && once) {
2497                         linkea_next_entry(ldata);
2498                         continue;
2499                 }
2500
2501                 parent = lfsck_object_find_bottom(env, lfsck, tfid);
2502                 if (IS_ERR(parent))
2503                         RETURN(PTR_ERR(parent));
2504
2505                 if (!dt_object_exists(parent)) {
2506                         lfsck_object_put(env, parent);
2507                         if (ldata->ld_leh->leh_reccount > 1) {
2508                                 /* If it is NOT the last linkEA entry, then
2509                                  * there is still other chance to make the
2510                                  * child to be visible via other parent, then
2511                                  * remove this linkEA entry. */
2512                                 linkea_del_buf(ldata, cname);
2513                                 continue;
2514                         }
2515
2516                         break;
2517                 }
2518
2519                 /* The linkEA entry with bad parent will be removed. */
2520                 if (unlikely(!dt_try_as_dir(env, parent))) {
2521                         lfsck_object_put(env, parent);
2522                         linkea_del_buf(ldata, cname);
2523                         continue;
2524                 }
2525
2526                 rc = dt_lookup(env, parent, (struct dt_rec *)tfid,
2527                                (const struct dt_key *)cname->ln_name,
2528                                BYPASS_CAPA);
2529                 *pfid2 = *lfsck_dto2fid(parent);
2530                 if (rc == -ENOENT) {
2531                         lfsck_object_put(env, parent);
2532                         linkea_next_entry(ldata);
2533                         continue;
2534                 }
2535
2536                 if (rc != 0) {
2537                         lfsck_object_put(env, parent);
2538
2539                         RETURN(rc);
2540                 }
2541
2542                 if (lu_fid_eq(tfid, cfid)) {
2543                         lfsck_object_put(env, parent);
2544                         if (!lu_fid_eq(pfid, pfid2)) {
2545                                 *type = LNIT_UNMATCHED_PAIRS;
2546                                 rc = lfsck_namespace_repair_unmatched_pairs(env,
2547                                                 com, child, pfid2, cname);
2548
2549                                 RETURN(rc);
2550                         }
2551
2552 rebuild:
2553                         /* It is the most common case that we find the
2554                          * name entry corresponding to the linkEA entry
2555                          * that matches the ".." name entry. */
2556                         rc = linkea_data_new(&ldata_new, &info->lti_big_buf);
2557                         if (rc != 0)
2558                                 RETURN(rc);
2559
2560                         rc = linkea_add_buf(&ldata_new, cname, pfid2);
2561                         if (rc != 0)
2562                                 RETURN(rc);
2563
2564                         rc = lfsck_namespace_rebuild_linkea(env, com, child,
2565                                                             &ldata_new);
2566                         if (rc < 0)
2567                                 RETURN(rc);
2568
2569                         linkea_del_buf(ldata, cname);
2570                         linkea_first_entry(ldata);
2571                         /* There may be some invalid dangling name entries under
2572                          * other parent directories, remove all of them. */
2573                         while (ldata->ld_lee != NULL) {
2574                                 lfsck_namespace_unpack_linkea_entry(ldata,
2575                                                 cname, tfid, info->lti_key);
2576                                 if (!fid_is_sane(tfid))
2577                                         goto next;
2578
2579                                 parent = lfsck_object_find_bottom(env, lfsck,
2580                                                                   tfid);
2581                                 if (IS_ERR(parent)) {
2582                                         rc = PTR_ERR(parent);
2583                                         if (rc != -ENOENT &&
2584                                             bk->lb_param & LPF_FAILOUT)
2585                                                 RETURN(rc);
2586
2587                                         goto next;
2588                                 }
2589
2590                                 if (!dt_object_exists(parent)) {
2591                                         lfsck_object_put(env, parent);
2592                                         goto next;
2593                                 }
2594
2595                                 rc = lfsck_namespace_repair_dirent(env, com,
2596                                         parent, child, cname->ln_name,
2597                                         cname->ln_name, S_IFDIR, false, true);
2598                                 lfsck_object_put(env, parent);
2599                                 if (rc < 0) {
2600                                         if (bk->lb_param & LPF_FAILOUT)
2601                                                 RETURN(rc);
2602
2603                                         goto next;
2604                                 }
2605
2606                                 count += rc;
2607
2608 next:
2609                                 linkea_del_buf(ldata, cname);
2610                         }
2611
2612                         ns->ln_dirent_repaired += count;
2613
2614                         RETURN(rc);
2615                 }
2616
2617                 lfsck_ibits_unlock(lh, LCK_EX);
2618                 /* The name entry references another MDT-object that may be
2619                  * created by the LFSCK for repairing dangling name entry.
2620                  * Try to replace it. */
2621                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
2622                                                   tfid, cname);
2623                 lfsck_object_put(env, parent);
2624                 if (rc < 0)
2625                         RETURN(rc);
2626
2627                 if (rc > 0)
2628                         goto rebuild;
2629
2630                 linkea_del_buf(ldata, cname);
2631         }
2632
2633         if (ldata->ld_leh->leh_reccount == 1) {
2634                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, ldata,
2635                                                 lh, type, NULL);
2636
2637                 RETURN(rc);
2638         }
2639
2640         /* All linkEA entries are invalid and removed, then handle the @child
2641          * as an orphan.*/
2642         if (ldata->ld_leh->leh_reccount == 0) {
2643                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, lh,
2644                                                 type);
2645
2646                 RETURN(rc);
2647         }
2648
2649         linkea_first_entry(ldata);
2650         /* If the dangling name entry for the orphan directory object has
2651          * been remvoed, then just check whether the directory object is
2652          * still under the .lustre/lost+found/MDTxxxx/ or not. */
2653         if (lpf) {
2654                 lpf = false;
2655                 goto again;
2656         }
2657
2658         /* There is no linkEA entry that matches the ".." name entry. Find
2659          * the first linkEA entry that both parent and name entry exist to
2660          * rebuild a new ".." name entry. */
2661         if (once) {
2662                 once = false;
2663                 goto again;
2664         }
2665
2666         RETURN(rc);
2667 }
2668
2669 /**
2670  * Repair the object's nlink attribute.
2671  *
2672  * If all the known name entries have been verified, then the object's hard
2673  * link attribute should match the object's linkEA entries count unless the
2674  * object's has too much hard link to be recorded in the linkEA. Such cases
2675  * should have been marked in the LFSCK tracing file. Otherwise, trust the
2676  * linkEA to update the object's nlink attribute.
2677  *
2678  * \param[in] env       pointer to the thread context
2679  * \param[in] com       pointer to the lfsck component
2680  * \param[in] obj       pointer to the dt_object to be handled
2681  * \param[in,out] nlink pointer to buffer to object's hard lock count before
2682  *                      and after the repairing
2683  *
2684  * \retval              positive number for repaired cases
2685  * \retval              0 if nothing to be repaired
2686  * \retval              negative error number on failure
2687  */
2688 static int lfsck_namespace_repair_nlink(const struct lu_env *env,
2689                                         struct lfsck_component *com,
2690                                         struct dt_object *obj, __u32 *nlink)
2691 {
2692         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2693         struct lu_attr                  *la     = &info->lti_la3;
2694         struct lu_fid                   *tfid   = &info->lti_fid3;
2695         struct lfsck_namespace          *ns     = com->lc_file_ram;
2696         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2697         struct dt_device                *dev    = lfsck->li_bottom;
2698         const struct lu_fid             *cfid   = lfsck_dto2fid(obj);
2699         struct dt_object                *child  = NULL;
2700         struct thandle                  *th     = NULL;
2701         struct linkea_data               ldata  = { 0 };
2702         struct lustre_handle             lh     = { 0 };
2703         __u32                            old    = *nlink;
2704         int                              rc     = 0;
2705         __u8                             flags;
2706         ENTRY;
2707
2708         LASSERT(!dt_object_remote(obj));
2709         LASSERT(S_ISREG(lfsck_object_type(obj)));
2710
2711         child = lfsck_object_find_by_dev(env, dev, cfid);
2712         if (IS_ERR(child))
2713                 GOTO(log, rc = PTR_ERR(child));
2714
2715         rc = lfsck_ibits_lock(env, lfsck, child, &lh,
2716                               MDS_INODELOCK_UPDATE |
2717                               MDS_INODELOCK_XATTR, LCK_EX);
2718         if (rc != 0)
2719                 GOTO(log, rc);
2720
2721         th = dt_trans_create(env, dev);
2722         if (IS_ERR(th))
2723                 GOTO(log, rc = PTR_ERR(th));
2724
2725         la->la_valid = LA_NLINK;
2726         rc = dt_declare_attr_set(env, child, la, th);
2727         if (rc != 0)
2728                 GOTO(stop, rc);
2729
2730         rc = dt_trans_start_local(env, dev, th);
2731         if (rc != 0)
2732                 GOTO(stop, rc);
2733
2734         dt_write_lock(env, child, 0);
2735         /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT has
2736          * ever tried to verify some remote MDT-object that resides on this
2737          * MDT, but this MDT failed to respond such request. So means there
2738          * may be some remote name entry on other MDT that references this
2739          * object with another name, so we cannot know whether this linkEA
2740          * is valid or not. So keep it there and maybe resolved when next
2741          * LFSCK run. */
2742         if (ns->ln_flags & LF_INCOMPLETE)
2743                 GOTO(unlock, rc = 0);
2744
2745         fid_cpu_to_be(tfid, cfid);
2746         rc = dt_lookup(env, com->lc_obj, (struct dt_rec *)&flags,
2747                        (const struct dt_key *)tfid, BYPASS_CAPA);
2748         if (rc != 0)
2749                 GOTO(unlock, rc);
2750
2751         if (flags & LNTF_SKIP_NLINK)
2752                 GOTO(unlock, rc = 0);
2753
2754         rc = lfsck_links_read2(env, child, &ldata);
2755         if (rc == -ENODATA)
2756                 GOTO(unlock, rc = 0);
2757
2758         if (rc != 0)
2759                 GOTO(unlock, rc);
2760
2761         if (*nlink == ldata.ld_leh->leh_reccount)
2762                 GOTO(unlock, rc = 0);
2763
2764         la->la_nlink = *nlink = ldata.ld_leh->leh_reccount;
2765         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2766                 GOTO(unlock, rc = 1);
2767
2768         rc = dt_attr_set(env, child, la, th, BYPASS_CAPA);
2769
2770         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2771
2772 unlock:
2773         dt_write_unlock(env, child);
2774
2775 stop:
2776         dt_trans_stop(env, dev, th);
2777
2778 log:
2779         lfsck_ibits_unlock(&lh, LCK_EX);
2780         if (child != NULL && !IS_ERR(child))
2781                 lfsck_object_put(env, child);
2782
2783         CDEBUG(D_LFSCK, "%s: namespace LFSCK repaired the object "DFID"'s "
2784                "nlink count from %u to %u: rc = %d\n",
2785                lfsck_lfsck2name(lfsck), PFID(cfid), old, *nlink, rc);
2786
2787         if (rc != 0)
2788                 ns->ln_flags |= LF_INCONSISTENT;
2789
2790         return rc;
2791 }
2792
2793 /**
2794  * Double scan the directory object for namespace LFSCK.
2795  *
2796  * This function will verify the <parent, child> pairs in the namespace tree:
2797  * the parent references the child via some name entry that should be in the
2798  * child's linkEA entry, the child should back references the parent via its
2799  * ".." name entry.
2800  *
2801  * The LFSCK will scan every linkEA entry in turn until find out the first
2802  * matched pairs. If found, then all other linkEA entries will be dropped.
2803  * If all the linkEA entries cannot match the ".." name entry, then there
2804  * are serveral possible cases:
2805  *
2806  * 1) If there is only one linkEA entry, then trust it as long as the PFID
2807  *    in the linkEA entry is valid.
2808  *
2809  * 2) If there are multiple linkEA entries, then try to find the linkEA
2810  *    that matches the ".." name entry. If found, then all other entries
2811  *    are invalid; otherwise, it is quite possible that the ".." name entry
2812  *    is corrupted. Under such case, the LFSCK will rebuild the ".." name
2813  *    entry according to the first valid linkEA entry (both the parent and
2814  *    the name entry should exist).
2815  *
2816  * 3) If the directory object has no (valid) linkEA entry, then the
2817  *    directory object will be handled as pure orphan and inserted
2818  *    in the .lustre/lost+found/MDTxxxx/ with the name:
2819  *    ${self_FID}-${PFID}-D-${conflict_version}
2820  *
2821  * \param[in] env       pointer to the thread context
2822  * \param[in] com       pointer to the lfsck component
2823  * \param[in] child     pointer to the directory object to be handled
2824  * \param[in] flags     to indicate the specical checking on the @child
2825  *
2826  * \retval              positive number for repaired cases
2827  * \retval              0 if nothing to be repaired
2828  * \retval              negative error number on failure
2829  */
2830 static int lfsck_namespace_double_scan_dir(const struct lu_env *env,
2831                                            struct lfsck_component *com,
2832                                            struct dt_object *child, __u8 flags)
2833 {
2834         struct lfsck_thread_info *info          = lfsck_env_info(env);
2835         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2836         struct lu_fid            *pfid          = &info->lti_fid2;
2837         struct lfsck_namespace   *ns            = com->lc_file_ram;
2838         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2839         struct lustre_handle      lh            = { 0 };
2840         struct linkea_data        ldata         = { 0 };
2841         bool                      unknown       = false;
2842         bool                      lpf           = false;
2843         bool                      retry         = false;
2844         enum lfsck_namespace_inconsistency_type type = LNIT_BAD_LINKEA;
2845         int                       rc            = 0;
2846         ENTRY;
2847
2848         LASSERT(!dt_object_remote(child));
2849
2850         if (flags & (LNTF_CHECK_LINKEA | LNTF_CHECK_PARENT) &&
2851             !(lfsck->li_bookmark_ram.lb_param & LPF_ALL_TGT)) {
2852                 CDEBUG(D_LFSCK, "%s: some MDT(s) maybe NOT take part in the"
2853                        "the namespace LFSCK, then the LFSCK cannot guarantee"
2854                        "all the name entries have been verified in first-stage"
2855                        "scanning. So have to skip orphan related handling for"
2856                        "the directory object "DFID" with remote name entry\n",
2857                        lfsck_lfsck2name(lfsck), PFID(cfid));
2858
2859                 RETURN(0);
2860         }
2861
2862         if (unlikely(!dt_try_as_dir(env, child)))
2863                 GOTO(out, rc = -ENOTDIR);
2864
2865         /* We only take ldlm lock on the @child when required. When the
2866          * logic comes here for the first time, it is always false. */
2867         if (0) {
2868
2869 lock:
2870                 rc = lfsck_ibits_lock(env, lfsck, child, &lh,
2871                                       MDS_INODELOCK_UPDATE |
2872                                       MDS_INODELOCK_XATTR, LCK_EX);
2873                 if (rc != 0)
2874                         GOTO(out, rc);
2875         }
2876
2877         dt_read_lock(env, child, 0);
2878         if (unlikely(lfsck_is_dead_obj(child))) {
2879                 dt_read_unlock(env, child);
2880
2881                 GOTO(out, rc = 0);
2882         }
2883
2884         rc = dt_lookup(env, child, (struct dt_rec *)pfid,
2885                        (const struct dt_key *)dotdot, BYPASS_CAPA);
2886         if (rc != 0) {
2887                 if (rc != -ENOENT && rc != -ENODATA && rc != -EINVAL) {
2888                         dt_read_unlock(env, child);
2889
2890                         GOTO(out, rc);
2891                 }
2892
2893                 if (!lustre_handle_is_used(&lh)) {
2894                         dt_read_unlock(env, child);
2895                         goto lock;
2896                 }
2897
2898                 fid_zero(pfid);
2899         } else if (lfsck->li_lpf_obj != NULL &&
2900                    lu_fid_eq(pfid, lfsck_dto2fid(lfsck->li_lpf_obj))) {
2901                 lpf = true;
2902         }
2903
2904         rc = lfsck_links_read(env, child, &ldata);
2905         dt_read_unlock(env, child);
2906         if (rc != 0) {
2907                 if (rc != -ENODATA && rc != -EINVAL)
2908                         GOTO(out, rc);
2909
2910                 if (!lustre_handle_is_used(&lh))
2911                         goto lock;
2912
2913                 if (rc == -EINVAL && !fid_is_zero(pfid)) {
2914                         /* Remove the corrupted linkEA. */
2915                         rc = lfsck_namespace_links_remove(env, com, child);
2916                         if (rc == 0)
2917                                 /* Here, because of the crashed linkEA, we
2918                                  * cannot know whether there is some parent
2919                                  * that references the child directory via
2920                                  * some name entry or not. So keep it there,
2921                                  * when the LFSCK run next time, if there is
2922                                  * some parent that references this object,
2923                                  * then the LFSCK can rebuild the linkEA;
2924                                  * otherwise, this object will be handled
2925                                  * as orphan as above. */
2926                                 unknown = true;
2927                 } else {
2928                         /* 1. If we have neither ".." nor linkEA,
2929                          *    then it is an orphan.
2930                          *
2931                          * 2. If we only have the ".." name entry,
2932                          *    but no parent references this child
2933                          *    directory, then handle it as orphan. */
2934                         lfsck_ibits_unlock(&lh, LCK_EX);
2935                         type = LNIT_MUL_REF;
2936
2937                         /* If the LFSCK is marked as LF_INCOMPLETE,
2938                          * then means some MDT has ever tried to
2939                          * verify some remote MDT-object that resides
2940                          * on this MDT, but this MDT failed to respond
2941                          * such request. So means there may be some
2942                          * remote name entry on other MDT that
2943                          * references this object with another name,
2944                          * so we cannot know whether this linkEA is
2945                          * valid or not. So keep it there and maybe
2946                          * resolved when next LFSCK run. */
2947                         if (ns->ln_flags & LF_INCOMPLETE)
2948                                 GOTO(out, rc = 0);
2949
2950                         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2951                                  "-"DFID, PFID(pfid));
2952                         rc = lfsck_namespace_insert_orphan(env, com, child,
2953                                                 info->lti_tmpbuf, "D", NULL);
2954                 }
2955
2956                 GOTO(out, rc);
2957         }
2958
2959         linkea_first_entry(&ldata);
2960         /* This is the most common case: the object has unique linkEA entry. */
2961         if (ldata.ld_leh->leh_reccount == 1) {
2962                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, &ldata,
2963                                                 &lh, &type, &retry);
2964                 if (retry) {
2965                         LASSERT(!lustre_handle_is_used(&lh));
2966
2967                         retry = false;
2968                         goto lock;
2969                 }
2970
2971                 GOTO(out, rc);
2972         }
2973
2974         if (!lustre_handle_is_used(&lh))
2975                 goto lock;
2976
2977         if (unlikely(ldata.ld_leh->leh_reccount == 0)) {
2978                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, &lh,
2979                                                 &type);
2980
2981                 GOTO(out, rc);
2982         }
2983
2984         /* When we come here, the cases usually like that:
2985          * 1) The directory object has a corrupted linkEA entry. During the
2986          *    first-stage scanning, the LFSCK cannot know such corruption,
2987          *    then it appends the right linkEA entry according to the found
2988          *    name entry after the bad one.
2989          *
2990          * 2) The directory object has a right linkEA entry. During the
2991          *    first-stage scanning, the LFSCK finds some bad name entry,
2992          *    but the LFSCK cannot aware that at that time, then it adds
2993          *    the bad linkEA entry for further processing. */
2994         rc = lfsck_namespace_dsd_multiple(env, com, child, pfid, &ldata,
2995                                           &lh, &type, lpf);
2996
2997         GOTO(out, rc);
2998
2999 out:
3000         lfsck_ibits_unlock(&lh, LCK_EX);
3001         if (rc > 0) {
3002                 switch (type) {
3003                 case LNIT_BAD_LINKEA:
3004                         ns->ln_linkea_repaired++;
3005                         break;
3006                 case LNIT_UNMATCHED_PAIRS:
3007                         ns->ln_unmatched_pairs_repaired++;
3008                         break;
3009                 case LNIT_MUL_REF:
3010                         ns->ln_mul_ref_repaired++;
3011                         break;
3012                 default:
3013                         break;
3014                 }
3015         }
3016
3017         if (unknown)
3018                 ns->ln_unknown_inconsistency++;
3019
3020         return rc;
3021 }
3022
3023 /**
3024  * Double scan the MDT-object for namespace LFSCK.
3025  *
3026  * If the MDT-object contains invalid or repeated linkEA entries, then drop
3027  * those entries from the linkEA; if the linkEA becomes empty or the object
3028  * has no linkEA, then it is an orphan and will be added into the directory
3029  * .lustre/lost+found/MDTxxxx/; if the remote parent is lost, then recreate
3030  * the remote parent; if the name entry corresponding to some linkEA entry
3031  * is lost, then add the name entry back to the namespace.
3032  *
3033  * \param[in] env       pointer to the thread context
3034  * \param[in] com       pointer to the lfsck component
3035  * \param[in] child     pointer to the dt_object to be handled
3036  * \param[in] flags     some hints to indicate how the @child should be handled
3037  *
3038  * \retval              positive number for repaired cases
3039  * \retval              0 if nothing to be repaired
3040  * \retval              negative error number on failure
3041  */
3042 static int lfsck_namespace_double_scan_one(const struct lu_env *env,
3043                                            struct lfsck_component *com,
3044                                            struct dt_object *child, __u8 flags)
3045 {
3046         struct lfsck_thread_info *info     = lfsck_env_info(env);
3047         struct lu_attr           *la       = &info->lti_la;
3048         struct lu_name           *cname    = &info->lti_name;
3049         struct lu_fid            *pfid     = &info->lti_fid;
3050         struct lu_fid            *cfid     = &info->lti_fid2;
3051         struct lfsck_instance    *lfsck    = com->lc_lfsck;
3052         struct lfsck_namespace   *ns       = com->lc_file_ram;
3053         struct dt_object         *parent   = NULL;
3054         struct linkea_data        ldata    = { 0 };
3055         bool                      repaired = false;
3056         int                       count    = 0;
3057         int                       rc;
3058         ENTRY;
3059
3060         dt_read_lock(env, child, 0);
3061         if (unlikely(lfsck_is_dead_obj(child))) {
3062                 dt_read_unlock(env, child);
3063
3064                 RETURN(0);
3065         }
3066
3067         if (S_ISDIR(lfsck_object_type(child))) {
3068                 dt_read_unlock(env, child);
3069                 rc = lfsck_namespace_double_scan_dir(env, com, child, flags);
3070
3071                 RETURN(rc);
3072         }
3073
3074         rc = lfsck_links_read(env, child, &ldata);
3075         dt_read_unlock(env, child);
3076         if (rc != 0)
3077                 GOTO(out, rc);
3078
3079         linkea_first_entry(&ldata);
3080         while (ldata.ld_lee != NULL) {
3081                 lfsck_namespace_unpack_linkea_entry(&ldata, cname, pfid,
3082                                                     info->lti_key);
3083                 rc = lfsck_namespace_filter_linkea_entry(&ldata, cname, pfid,
3084                                                          false);
3085                 /* Found repeated linkEA entries */
3086                 if (rc > 0) {
3087                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3088                                                 &ldata, cname, pfid, false);
3089                         if (rc < 0)
3090                                 GOTO(out, rc);
3091
3092                         if (rc == 0)
3093                                 continue;
3094
3095                         repaired = true;
3096
3097                         /* fall through */
3098                 }
3099
3100                 /* Invalid PFID in the linkEA entry. */
3101                 if (!fid_is_sane(pfid)) {
3102                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3103                                                 &ldata, cname, pfid, true);
3104                         if (rc < 0)
3105                                 GOTO(out, rc);
3106
3107                         if (rc > 0)
3108                                 repaired = true;
3109
3110                         continue;
3111                 }
3112
3113                 parent = lfsck_object_find_bottom(env, lfsck, pfid);
3114                 if (IS_ERR(parent))
3115                         GOTO(out, rc = PTR_ERR(parent));
3116
3117                 if (!dt_object_exists(parent)) {
3118
3119 lost_parent:
3120                         if (ldata.ld_leh->leh_reccount > 1) {
3121                                 /* If it is NOT the last linkEA entry, then
3122                                  * there is still other chance to make the
3123                                  * child to be visible via other parent, then
3124                                  * remove this linkEA entry. */
3125                                 rc = lfsck_namespace_shrink_linkea(env, com,
3126                                         child, &ldata, cname, pfid, true);
3127                         } else {
3128                                 /* If the LFSCK is marked as LF_INCOMPLETE,
3129                                  * then means some MDT has ever tried to
3130                                  * verify some remote MDT-object that resides
3131                                  * on this MDT, but this MDT failed to respond
3132                                  * such request. So means there may be some
3133                                  * remote name entry on other MDT that
3134                                  * references this object with another name,
3135                                  * so we cannot know whether this linkEA is
3136                                  * valid or not. So keep it there and maybe
3137                                  * resolved when next LFSCK run. */
3138                                 if (ns->ln_flags & LF_INCOMPLETE) {
3139                                         lfsck_object_put(env, parent);
3140
3141                                         GOTO(out, rc = 0);
3142                                 }
3143
3144                                 /* Create the lost parent as an orphan. */
3145                                 rc = lfsck_namespace_create_orphan(env, com,
3146                                                                    parent);
3147                                 if (rc < 0) {
3148                                         lfsck_object_put(env, parent);
3149
3150                                         GOTO(out, rc);
3151                                 }
3152
3153                                 if (rc > 0)
3154                                         repaired = true;
3155
3156                                 /* Add the missing name entry to the parent. */
3157                                 rc = lfsck_namespace_insert_normal(env, com,
3158                                                 parent, child, cname->ln_name);
3159                                 if (unlikely(rc == -EEXIST))
3160                                         /* Unfortunately, someone reused the
3161                                          * name under the parent by race. So we
3162                                          * have to remove the linkEA entry from
3163                                          * current child object. It means that
3164                                          * the LFSCK cannot recover the system
3165                                          * totally back to its original status,
3166                                          * but it is necessary to make the
3167                                          * current system to be consistent. */
3168                                         rc = lfsck_namespace_shrink_linkea(env,
3169                                                         com, child, &ldata,
3170                                                         cname, pfid, true);
3171                                 else
3172                                         linkea_next_entry(&ldata);
3173                         }
3174
3175                         lfsck_object_put(env, parent);
3176                         if (rc < 0)
3177                                 GOTO(out, rc);
3178
3179                         if (rc > 0)
3180                                 repaired = true;
3181
3182                         continue;
3183                 }
3184
3185                 /* The linkEA entry with bad parent will be removed. */
3186                 if (unlikely(!dt_try_as_dir(env, parent))) {
3187                         lfsck_object_put(env, parent);
3188                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3189                                                 &ldata, cname, pfid, true);
3190                         if (rc < 0)
3191                                 GOTO(out, rc);
3192
3193                         if (rc > 0)
3194                                 repaired = true;
3195
3196                         continue;
3197                 }
3198
3199                 rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
3200                                (const struct dt_key *)cname->ln_name,
3201                                BYPASS_CAPA);
3202                 if (rc != 0 && rc != -ENOENT) {
3203                         lfsck_object_put(env, parent);
3204
3205                         GOTO(out, rc);
3206                 }
3207
3208                 if (rc == 0) {
3209                         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
3210                                 /* It is the most common case that we
3211                                  * find the name entry corresponding
3212                                  * to the linkEA entry. */
3213                                 lfsck_object_put(env, parent);
3214                                 linkea_next_entry(&ldata);
3215                         } else {
3216                                 /* The name entry references another
3217                                  * MDT-object that may be created by
3218                                  * the LFSCK for repairing dangling
3219                                  * name entry. Try to replace it. */
3220                                 rc = lfsck_namespace_replace_cond(env, com,
3221                                                 parent, child, cfid, cname);
3222                                 lfsck_object_put(env, parent);
3223                                 if (rc < 0)
3224                                         GOTO(out, rc);
3225
3226                                 if (rc > 0) {
3227                                         repaired = true;
3228                                         linkea_next_entry(&ldata);
3229                                 } else {
3230                                         rc = lfsck_namespace_shrink_linkea(env,
3231                                                         com, child, &ldata,
3232                                                         cname, pfid, true);
3233                                         if (rc < 0)
3234                                                 GOTO(out, rc);
3235
3236                                         if (rc > 0)
3237                                                 repaired = true;
3238                                 }
3239                         }
3240
3241                         continue;
3242                 }
3243
3244                 rc = dt_attr_get(env, child, la, BYPASS_CAPA);
3245                 if (rc != 0)
3246                         GOTO(out, rc);
3247
3248                 /* If there is no name entry in the parent dir and the object
3249                  * link count is less than the linkea entries count, then the
3250                  * linkea entry should be removed. */
3251                 if (ldata.ld_leh->leh_reccount > la->la_nlink) {
3252                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
3253                                         parent, child, &ldata, cname, pfid);
3254                         lfsck_object_put(env, parent);
3255                         if (rc < 0)
3256                                 GOTO(out, rc);
3257
3258                         if (rc > 0)
3259                                 repaired = true;
3260
3261                         continue;
3262                 }
3263
3264                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some
3265                  * MDT has ever tried to verify some remote MDT-object that
3266                  * resides on this MDT, but this MDT failed to respond such
3267                  * request. So means there may be some remote name entry on
3268                  * other MDT that references this object with another name,
3269                  * so we cannot know whether this linkEA is valid or not.
3270                  * So keep it there and maybe resolved when next LFSCK run. */
3271                 if (ns->ln_flags & LF_INCOMPLETE) {
3272                         lfsck_object_put(env, parent);
3273
3274                         GOTO(out, rc = 0);
3275                 }
3276
3277                 /* Add the missing name entry back to the namespace. */
3278                 rc = lfsck_namespace_insert_normal(env, com, parent, child,
3279                                                    cname->ln_name);
3280                 if (unlikely(rc == -ESTALE))
3281                         /* It may happen when the remote object has been
3282                          * removed, but the local MDT is not aware of that. */
3283                         goto lost_parent;
3284
3285                 if (unlikely(rc == -EEXIST))
3286                         /* Unfortunately, someone reused the name under the
3287                          * parent by race. So we have to remove the linkEA
3288                          * entry from current child object. It means that the
3289                          * LFSCK cannot recover the system totally back to
3290                          * its original status, but it is necessary to make
3291                          * the current system to be consistent.
3292                          *
3293                          * It also may be because of the LFSCK found some
3294                          * internal status of create operation. Under such
3295                          * case, nothing to be done. */
3296                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
3297                                         parent, child, &ldata, cname, pfid);
3298                 else
3299                         linkea_next_entry(&ldata);
3300
3301                 lfsck_object_put(env, parent);
3302                 if (rc < 0)
3303                         GOTO(out, rc);
3304
3305                 if (rc > 0)
3306                         repaired = true;
3307         }
3308
3309         GOTO(out, rc = 0);
3310
3311 out:
3312         if (rc < 0 && rc != -ENODATA)
3313                 return rc;
3314
3315         if (rc == 0) {
3316                 LASSERT(ldata.ld_leh != NULL);
3317
3318                 count = ldata.ld_leh->leh_reccount;
3319         }
3320
3321         /* If the LFSCK is marked as LF_INCOMPLETE, then means some
3322          * MDT has ever tried to verify some remote MDT-object that
3323          * resides on this MDT, but this MDT failed to respond such
3324          * request. So means there may be some remote name entry on
3325          * other MDT that references this object with another name,
3326          * so we cannot know whether this linkEA is valid or not.
3327          * So keep it there and maybe resolved when next LFSCK run. */
3328         if (count == 0 && !(ns->ln_flags & LF_INCOMPLETE)) {
3329                 /* If the child becomes orphan, then insert it into
3330                  * the global .lustre/lost+found/MDTxxxx directory. */
3331                 rc = lfsck_namespace_insert_orphan(env, com, child, "", "O",
3332                                                    &count);
3333                 if (rc < 0)
3334                         return rc;
3335
3336                 if (rc > 0) {
3337                         ns->ln_mul_ref_repaired++;
3338                         repaired = true;
3339                 }
3340         }
3341
3342         rc = dt_attr_get(env, child, la, BYPASS_CAPA);
3343         if (rc != 0)
3344                 return rc;
3345
3346         if (la->la_nlink != count) {
3347                 rc = lfsck_namespace_repair_nlink(env, com, child,
3348                                                   &la->la_nlink);
3349                 if (rc > 0) {
3350                         ns->ln_objs_nlink_repaired++;
3351                         rc = 0;
3352                 }
3353         }
3354
3355         if (repaired) {
3356                 if (la->la_nlink > 1)
3357                         ns->ln_mul_linked_repaired++;
3358
3359                 if (rc == 0)
3360                         rc = 1;
3361         }
3362
3363         return rc;
3364 }
3365
3366 static void lfsck_namespace_dump_statistics(struct seq_file *m,
3367                                             struct lfsck_namespace *ns,
3368                                             __u64 checked_phase1,
3369                                             __u64 checked_phase2,
3370                                             __u32 time_phase1,
3371                                             __u32 time_phase2)
3372 {
3373         seq_printf(m, "checked_phase1: "LPU64"\n"
3374                       "checked_phase2: "LPU64"\n"
3375                       "updated_phase1: "LPU64"\n"
3376                       "updated_phase2: "LPU64"\n"
3377                       "failed_phase1: "LPU64"\n"
3378                       "failed_phase2: "LPU64"\n"
3379                       "directories: "LPU64"\n"
3380                       "dirent_repaired: "LPU64"\n"
3381                       "linkea_repaired: "LPU64"\n"
3382                       "nlinks_repaired: "LPU64"\n"
3383                       "multiple_linked_checked: "LPU64"\n"
3384                       "multiple_linked_repaired: "LPU64"\n"
3385                       "unknown_inconsistency: "LPU64"\n"
3386                       "unmatched_pairs_repaired: "LPU64"\n"
3387                       "dangling_repaired: "LPU64"\n"
3388                       "multiple_referenced_repaired: "LPU64"\n"
3389                       "bad_file_type_repaired: "LPU64"\n"
3390                       "lost_dirent_repaired: "LPU64"\n"
3391                       "success_count: %u\n"
3392                       "run_time_phase1: %u seconds\n"
3393                       "run_time_phase2: %u seconds\n",
3394                       checked_phase1,
3395                       checked_phase2,
3396                       ns->ln_items_repaired,
3397                       ns->ln_objs_repaired_phase2,
3398                       ns->ln_items_failed,
3399                       ns->ln_objs_failed_phase2,
3400                       ns->ln_dirs_checked,
3401                       ns->ln_dirent_repaired,
3402                       ns->ln_linkea_repaired,
3403                       ns->ln_objs_nlink_repaired,
3404                       ns->ln_mul_linked_checked,
3405                       ns->ln_mul_linked_repaired,
3406                       ns->ln_unknown_inconsistency,
3407                       ns->ln_unmatched_pairs_repaired,
3408                       ns->ln_dangling_repaired,
3409                       ns->ln_mul_ref_repaired,
3410                       ns->ln_bad_type_repaired,
3411                       ns->ln_lost_dirent_repaired,
3412                       ns->ln_success_count,
3413                       time_phase1,
3414                       time_phase2);
3415 }
3416
3417 /* namespace APIs */
3418
3419 static int lfsck_namespace_reset(const struct lu_env *env,
3420                                  struct lfsck_component *com, bool init)
3421 {
3422         struct lfsck_instance           *lfsck  = com->lc_lfsck;
3423         struct lfsck_namespace          *ns     = com->lc_file_ram;
3424         struct lfsck_assistant_data     *lad    = com->lc_data;
3425         struct dt_object                *root;
3426         struct dt_object                *dto;
3427         int                              rc;