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LU-8301 lfsck: handle ROOT fid properly
[fs/lustre-release.git] / lustre / lfsck / lfsck_namespace.c
index 91e0355..cbac028 100644 (file)
@@ -20,7 +20,7 @@
  * GPL HEADER END
  */
 /*
- * Copyright (c) 2013, 2014, Intel Corporation.
+ * Copyright (c) 2013, 2015, Intel Corporation.
  */
 /*
  * lustre/lfsck/lfsck_namespace.c
@@ -59,6 +59,7 @@ enum lfsck_nameentry_check {
 
 static struct lfsck_namespace_req *
 lfsck_namespace_assistant_req_init(struct lfsck_instance *lfsck,
+                                  struct lfsck_assistant_object *lso,
                                   struct lu_dirent *ent, __u16 type)
 {
        struct lfsck_namespace_req *lnr;
@@ -70,10 +71,9 @@ lfsck_namespace_assistant_req_init(struct lfsck_instance *lfsck,
                return ERR_PTR(-ENOMEM);
 
        INIT_LIST_HEAD(&lnr->lnr_lar.lar_list);
-       lnr->lnr_obj = lfsck_object_get(lfsck->li_obj_dir);
+       lnr->lnr_lar.lar_parent = lfsck_assistant_object_get(lso);
        lnr->lnr_lmv = lfsck_lmv_get(lfsck->li_lmv);
        lnr->lnr_fid = ent->lde_fid;
-       lnr->lnr_oit_cookie = lfsck->li_pos_current.lp_oit_cookie;
        lnr->lnr_dir_cookie = ent->lde_hash;
        lnr->lnr_attr = ent->lde_attrs;
        lnr->lnr_size = size;
@@ -93,7 +93,7 @@ static void lfsck_namespace_assistant_req_fini(const struct lu_env *env,
        if (lnr->lnr_lmv != NULL)
                lfsck_lmv_put(env, lnr->lnr_lmv);
 
-       lu_object_put(env, &lnr->lnr_obj->do_lu);
+       lfsck_assistant_object_put(env, lar->lar_parent);
        OBD_FREE(lnr, lnr->lnr_size);
 }
 
@@ -248,7 +248,7 @@ static void lfsck_namespace_record_failure(const struct lu_env *env,
                ns->ln_pos_first_inconsistent = pos;
 
                CDEBUG(D_LFSCK, "%s: namespace LFSCK hit first non-repaired "
-                      "inconsistency at the pos ["LPU64", "DFID", "LPX64"]\n",
+                      "inconsistency at the pos [%llu, "DFID", %#llx]\n",
                       lfsck_lfsck2name(lfsck),
                       ns->ln_pos_first_inconsistent.lp_oit_cookie,
                       PFID(&ns->ln_pos_first_inconsistent.lp_dir_parent),
@@ -271,7 +271,7 @@ static int lfsck_namespace_load_bitmap(const struct lu_env *env,
        struct dt_object                *obj    = com->lc_obj;
        struct lfsck_assistant_data     *lad    = com->lc_data;
        struct lfsck_namespace          *ns     = com->lc_file_ram;
-       cfs_bitmap_t                    *bitmap = lad->lad_bitmap;
+       struct cfs_bitmap                       *bitmap = lad->lad_bitmap;
        ssize_t                          size;
        __u32                            nbits;
        int                              rc;
@@ -288,7 +288,7 @@ static int lfsck_namespace_load_bitmap(const struct lu_env *env,
 
        if (nbits > bitmap->size) {
                __u32 new_bits = bitmap->size;
-               cfs_bitmap_t *new_bitmap;
+               struct cfs_bitmap *new_bitmap;
 
                while (new_bits < nbits)
                        new_bits <<= 1;
@@ -312,7 +312,7 @@ static int lfsck_namespace_load_bitmap(const struct lu_env *env,
        size = (ns->ln_bitmap_size + 7) >> 3;
        rc = dt_xattr_get(env, obj,
                          lfsck_buf_get(env, bitmap->data, size),
-                         XATTR_NAME_LFSCK_BITMAP, BYPASS_CAPA);
+                         XATTR_NAME_LFSCK_BITMAP);
        if (rc != size)
                RETURN(rc >= 0 ? -EINVAL : rc);
 
@@ -327,12 +327,6 @@ static int lfsck_namespace_load_bitmap(const struct lu_env *env,
 /**
  * Load namespace LFSCK statistics information from the trace file.
  *
- * For old release (Lustre-2.6 or older), the statistics information was
- * stored as XATTR_NAME_LFSCK_NAMESPACE_OLD EA. But in Lustre-2.7, we need
- * more statistics information. To avoid confusing old MDT when downgrade,
- * Lustre-2.7 stores the namespace LFSCK statistics information as new
- * XATTR_NAME_LFSCK_NAMESPACE EA.
- *
  * \param[in] env      pointer to the thread context
  * \param[in] com      pointer to the lfsck component
  *
@@ -347,7 +341,7 @@ static int lfsck_namespace_load(const struct lu_env *env,
 
        rc = dt_xattr_get(env, com->lc_obj,
                          lfsck_buf_get(env, com->lc_file_disk, len),
-                         XATTR_NAME_LFSCK_NAMESPACE, BYPASS_CAPA);
+                         XATTR_NAME_LFSCK_NAMESPACE);
        if (rc == len) {
                struct lfsck_namespace *ns = com->lc_file_ram;
 
@@ -367,34 +361,24 @@ static int lfsck_namespace_load(const struct lu_env *env,
                       lfsck_lfsck2name(com->lc_lfsck), len, rc);
                if (rc >= 0)
                        rc = -ESTALE;
-       } else {
-               /* Check whether it is old trace file or not.
-                * If yes, it should be reset via returning -ESTALE. */
-               rc = dt_xattr_get(env, com->lc_obj,
-                                 lfsck_buf_get(env, com->lc_file_disk, len),
-                                 XATTR_NAME_LFSCK_NAMESPACE_OLD, BYPASS_CAPA);
-               if (rc >= 0)
-                       rc = -ESTALE;
        }
 
        return rc;
 }
 
 static int lfsck_namespace_store(const struct lu_env *env,
-                                struct lfsck_component *com, bool init)
+                                struct lfsck_component *com)
 {
        struct dt_object                *obj    = com->lc_obj;
        struct lfsck_instance           *lfsck  = com->lc_lfsck;
        struct lfsck_namespace          *ns     = com->lc_file_ram;
        struct lfsck_assistant_data     *lad    = com->lc_data;
-       cfs_bitmap_t                    *bitmap = NULL;
+       struct dt_device                *dev    = lfsck_obj2dev(obj);
+       struct cfs_bitmap               *bitmap = NULL;
        struct thandle                  *handle;
        __u32                            nbits  = 0;
        int                              len    = com->lc_file_size;
        int                              rc;
-#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 8, 53, 0)
-       struct lu_buf            tbuf   = { &len, sizeof(len) };
-#endif
        ENTRY;
 
        if (lad != NULL) {
@@ -408,7 +392,7 @@ static int lfsck_namespace_store(const struct lu_env *env,
        ns->ln_bitmap_size = nbits;
        lfsck_namespace_cpu_to_le((struct lfsck_namespace *)com->lc_file_disk,
                                  ns);
-       handle = dt_trans_create(env, lfsck->li_bottom);
+       handle = dt_trans_create(env, dev);
        if (IS_ERR(handle))
                GOTO(log, rc = PTR_ERR(handle));
 
@@ -426,44 +410,22 @@ static int lfsck_namespace_store(const struct lu_env *env,
                        GOTO(out, rc);
        }
 
-#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 8, 53, 0)
-       /* To be compatible with old Lustre-2.x MDT (x <= 6), generate dummy
-        * XATTR_NAME_LFSCK_NAMESPACE_OLD EA, then when downgrade to Lustre-2.x,
-        * the old LFSCK will find "invalid" XATTR_NAME_LFSCK_NAMESPACE_OLD EA,
-        * then reset the namespace LFSCK trace file. */
-       if (init) {
-               rc = dt_declare_xattr_set(env, obj, &tbuf,
-                                         XATTR_NAME_LFSCK_NAMESPACE_OLD,
-                                         LU_XATTR_CREATE, handle);
-               if (rc != 0)
-                       GOTO(out, rc);
-       }
-#endif
-
-       rc = dt_trans_start_local(env, lfsck->li_bottom, handle);
+       rc = dt_trans_start_local(env, dev, handle);
        if (rc != 0)
                GOTO(out, rc);
 
        rc = dt_xattr_set(env, obj,
                          lfsck_buf_get(env, com->lc_file_disk, len),
-                         XATTR_NAME_LFSCK_NAMESPACE, 0, handle, BYPASS_CAPA);
+                         XATTR_NAME_LFSCK_NAMESPACE, 0, handle);
        if (rc == 0 && bitmap != NULL)
                rc = dt_xattr_set(env, obj,
                                  lfsck_buf_get(env, bitmap->data, nbits >> 3),
-                                 XATTR_NAME_LFSCK_BITMAP, 0, handle,
-                                 BYPASS_CAPA);
-
-#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 8, 53, 0)
-       if (rc == 0 && init)
-               rc = dt_xattr_set(env, obj, &tbuf,
-                                 XATTR_NAME_LFSCK_NAMESPACE_OLD,
-                                 LU_XATTR_CREATE, handle, BYPASS_CAPA);
-#endif
+                                 XATTR_NAME_LFSCK_BITMAP, 0, handle);
 
        GOTO(out, rc);
 
 out:
-       dt_trans_stop(env, lfsck->li_bottom, handle);
+       dt_trans_stop(env, dev, handle);
 
 log:
        if (rc != 0)
@@ -476,9 +438,7 @@ static struct dt_object *
 lfsck_namespace_load_one_trace_file(const struct lu_env *env,
                                    struct lfsck_component *com,
                                    struct dt_object *parent,
-                                   const char *name,
-                                   const struct dt_index_features *ft,
-                                   bool reset)
+                                   const char *name, bool reset)
 {
        struct lfsck_instance   *lfsck = com->lc_lfsck;
        struct dt_object        *obj;
@@ -490,12 +450,9 @@ lfsck_namespace_load_one_trace_file(const struct lu_env *env,
                        return ERR_PTR(rc);
        }
 
-       if (ft != NULL)
-               obj = local_index_find_or_create(env, lfsck->li_los, parent,
-                                       name, S_IFREG | S_IRUGO | S_IWUSR, ft);
-       else
-               obj = local_file_find_or_create(env, lfsck->li_los, parent,
-                                       name, S_IFREG | S_IRUGO | S_IWUSR);
+       obj = local_index_find_or_create(env, lfsck->li_los, parent, name,
+                                        S_IFREG | S_IRUGO | S_IWUSR,
+                                        &dt_lfsck_features);
 
        return obj;
 }
@@ -517,13 +474,12 @@ static int lfsck_namespace_load_sub_trace_files(const struct lu_env *env,
                        if (!reset)
                                continue;
 
-                       lu_object_put(env, &lsto->lsto_obj->do_lu);
+                       lfsck_object_put(env, lsto->lsto_obj);
                        lsto->lsto_obj = NULL;
                }
 
                obj = lfsck_namespace_load_one_trace_file(env, com,
-                                       com->lc_lfsck->li_lfsck_dir,
-                                       name, &dt_lfsck_features, reset);
+                               com->lc_lfsck->li_lfsck_dir, name, reset);
                if (IS_ERR(obj))
                        return PTR_ERR(obj);
 
@@ -546,7 +502,7 @@ static int lfsck_namespace_init(const struct lu_env *env,
        ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
        ns->ln_status = LS_INIT;
        down_write(&com->lc_sem);
-       rc = lfsck_namespace_store(env, com, true);
+       rc = lfsck_namespace_store(env, com);
        up_write(&com->lc_sem);
        if (rc == 0)
                rc = lfsck_namespace_load_sub_trace_files(env, com, true);
@@ -563,7 +519,7 @@ static int lfsck_namespace_init(const struct lu_env *env,
  *                     trace file
  * \param[in] add      true if add new flags, otherwise remove flags
  *
- * \retval             0 for succeed or nothing to be done
+ * \retval             0 for success or nothing to be done
  * \retval             negative error number on failure
  */
 int lfsck_namespace_trace_update(const struct lu_env *env,
@@ -574,7 +530,7 @@ int lfsck_namespace_trace_update(const struct lu_env *env,
        struct lfsck_instance   *lfsck  = com->lc_lfsck;
        struct dt_object        *obj;
        struct lu_fid           *key    = &lfsck_env_info(env)->lti_fid3;
-       struct dt_device        *dev    = lfsck->li_bottom;
+       struct dt_device        *dev;
        struct thandle          *th     = NULL;
        int                      idx;
        int                      rc     = 0;
@@ -584,12 +540,16 @@ int lfsck_namespace_trace_update(const struct lu_env *env,
 
        LASSERT(flags != 0);
 
+       if (unlikely(!fid_is_sane(fid)))
+               RETURN(0);
+
        idx = lfsck_sub_trace_file_fid2idx(fid);
        obj = com->lc_sub_trace_objs[idx].lsto_obj;
+       dev = lfsck_obj2dev(obj);
        mutex_lock(&com->lc_sub_trace_objs[idx].lsto_mutex);
        fid_cpu_to_be(key, fid);
        rc = dt_lookup(env, obj, (struct dt_rec *)&old,
-                      (const struct dt_key *)key, BYPASS_CAPA);
+                      (const struct dt_key *)key);
        if (rc == -ENOENT) {
                if (!add)
                        GOTO(unlock, rc = 0);
@@ -636,15 +596,14 @@ int lfsck_namespace_trace_update(const struct lu_env *env,
                GOTO(log, rc);
 
        if (old != 0) {
-               rc = dt_delete(env, obj, (const struct dt_key *)key,
-                              th, BYPASS_CAPA);
+               rc = dt_delete(env, obj, (const struct dt_key *)key, th);
                if (rc != 0)
                        GOTO(log, rc);
        }
 
        if (new != 0) {
                rc = dt_insert(env, obj, (const struct dt_rec *)&new,
-                              (const struct dt_key *)key, th, BYPASS_CAPA, 1);
+                              (const struct dt_key *)key, th, 1);
                if (rc != 0)
                        GOTO(log, rc);
        }
@@ -678,7 +637,7 @@ int lfsck_namespace_check_exist(const struct lu_env *env,
                RETURN(LFSCK_NAMEENTRY_DEAD);
 
        rc = dt_lookup(env, dir, (struct dt_rec *)fid,
-                      (const struct dt_key *)name, BYPASS_CAPA);
+                      (const struct dt_key *)name);
        if (rc == -ENOENT)
                RETURN(LFSCK_NAMEENTRY_REMOVED);
 
@@ -699,11 +658,9 @@ static int lfsck_declare_namespace_exec_dir(const struct lu_env *env,
 
        /* For destroying all invalid linkEA entries. */
        rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, handle);
-       if (rc != 0)
-               return rc;
-
-       /* For insert new linkEA entry. */
-       rc = dt_declare_xattr_set(env, obj,
+       if (rc == 0)
+               /* For insert new linkEA entry. */
+               rc = dt_declare_xattr_set(env, obj,
                        lfsck_buf_get_const(env, NULL, DEFAULT_LINKEA_SIZE),
                        XATTR_NAME_LINK, 0, handle);
        return rc;
@@ -720,22 +677,26 @@ int __lfsck_links_read(const struct lu_env *env, struct dt_object *obj,
        if (!dt_object_exists(obj))
                return -ENOENT;
 
-       rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK, BYPASS_CAPA);
+       rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK);
        if (rc == -ERANGE) {
                /* Buf was too small, figure out what we need. */
-               rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LINK,
-                                 BYPASS_CAPA);
-               if (rc <= 0)
+               rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LINK);
+               if (unlikely(rc == 0))
+                       return -ENODATA;
+
+               if (rc < 0)
                        return rc;
 
                lu_buf_realloc(ldata->ld_buf, rc);
                if (ldata->ld_buf->lb_buf == NULL)
                        return -ENOMEM;
 
-               rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK,
-                                 BYPASS_CAPA);
+               rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK);
        }
 
+       if (unlikely(rc == 0))
+               return -ENODATA;
+
        if (rc > 0)
                rc = linkea_init(ldata);
 
@@ -759,7 +720,7 @@ static int lfsck_namespace_links_remove(const struct lu_env *env,
                                        struct dt_object *obj)
 {
        struct lfsck_instance           *lfsck  = com->lc_lfsck;
-       struct dt_device                *dev    = lfsck->li_bottom;
+       struct dt_device                *dev    = lfsck_obj2dev(obj);
        struct thandle                  *th     = NULL;
        int                              rc     = 0;
        ENTRY;
@@ -785,7 +746,7 @@ static int lfsck_namespace_links_remove(const struct lu_env *env,
        if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
                GOTO(unlock, rc = 0);
 
-       rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, th, BYPASS_CAPA);
+       rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, th);
 
        GOTO(unlock, rc);
 
@@ -816,20 +777,62 @@ static int lfsck_links_write(const struct lu_env *env, struct dt_object *obj,
                                                       ldata->ld_buf->lb_buf,
                                                       ldata->ld_leh->leh_len);
 
-       return dt_xattr_set(env, obj, buf, XATTR_NAME_LINK, 0, handle,
-                           BYPASS_CAPA);
+       return dt_xattr_set(env, obj, buf, XATTR_NAME_LINK, 0, handle);
 }
 
-static void lfsck_namespace_unpack_linkea_entry(struct linkea_data *ldata,
-                                               struct lu_name *cname,
-                                               struct lu_fid *pfid,
-                                               char *buf)
+static int lfsck_namespace_unpack_linkea_entry(struct linkea_data *ldata,
+                                              struct lu_name *cname,
+                                              struct lu_fid *pfid,
+                                              char *buf, const int buflen)
 {
        linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, cname, pfid);
+       if (unlikely(ldata->ld_reclen <= 0 ||
+                    ldata->ld_reclen + sizeof(struct link_ea_header) >
+                       ldata->ld_leh->leh_len ||
+                    cname->ln_namelen <= 0 ||
+                    cname->ln_namelen > NAME_MAX ||
+                    cname->ln_namelen >= buflen ||
+                    !fid_is_sane(pfid)))
+               return -EINVAL;
+
        /* To guarantee the 'name' is terminated with '0'. */
        memcpy(buf, cname->ln_name, cname->ln_namelen);
        buf[cname->ln_namelen] = 0;
        cname->ln_name = buf;
+
+       return 0;
+}
+
+static void lfsck_linkea_del_buf(struct linkea_data *ldata,
+                                const struct lu_name *lname)
+{
+       LASSERT(ldata->ld_leh != NULL && ldata->ld_lee != NULL);
+
+       /* If current record is corrupted, all the subsequent
+        * records will be dropped. */
+       if (unlikely(ldata->ld_reclen <= 0 ||
+                    ldata->ld_reclen + sizeof(struct link_ea_header) >
+                       ldata->ld_leh->leh_len)) {
+               void *ptr = ldata->ld_lee;
+
+               ldata->ld_leh->leh_len = sizeof(struct link_ea_header);
+               ldata->ld_leh->leh_reccount = 0;
+               linkea_first_entry(ldata);
+               while (ldata->ld_lee != NULL &&
+                      (char *)ldata->ld_lee < (char *)ptr) {
+                       int reclen = (ldata->ld_lee->lee_reclen[0] << 8) |
+                                    ldata->ld_lee->lee_reclen[1];
+
+                       ldata->ld_leh->leh_len += reclen;
+                       ldata->ld_leh->leh_reccount++;
+                       ldata->ld_lee = (struct link_ea_entry *)
+                                       ((char *)ldata->ld_lee + reclen);
+               }
+
+               ldata->ld_lee = NULL;
+       } else {
+               linkea_del_buf(ldata, lname);
+       }
 }
 
 static int lfsck_namespace_filter_linkea_entry(struct linkea_data *ldata,
@@ -853,7 +856,7 @@ static int lfsck_namespace_filter_linkea_entry(struct linkea_data *ldata,
                        if (!remove)
                                break;
 
-                       linkea_del_buf(ldata, cname);
+                       lfsck_linkea_del_buf(ldata, cname);
                } else {
                        linkea_next_entry(ldata);
                }
@@ -911,17 +914,17 @@ static int lfsck_namespace_insert_orphan(const struct lu_env *env,
        struct lfsck_thread_info        *info   = lfsck_env_info(env);
        struct lu_name                  *cname  = &info->lti_name;
        struct dt_insert_rec            *rec    = &info->lti_dt_rec;
-       struct lu_attr                  *la     = &info->lti_la3;
+       struct lu_attr                  *la     = &info->lti_la2;
        const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
        const struct lu_fid             *pfid;
        struct lu_fid                    tfid;
        struct lfsck_instance           *lfsck  = com->lc_lfsck;
-       struct dt_device                *dev    = lfsck->li_bottom;
+       struct dt_device                *dev    = lfsck_obj2dev(orphan);
        struct dt_object                *parent;
        struct thandle                  *th     = NULL;
-       struct lustre_handle             plh    = { 0 };
+       struct lfsck_lock_handle        *pllh   = &info->lti_llh;
        struct lustre_handle             clh    = { 0 };
-       struct linkea_data               ldata  = { NULL };
+       struct linkea_data               ldata2 = { NULL };
        struct lu_buf                    linkea_buf;
        int                              namelen;
        int                              idx    = 0;
@@ -936,18 +939,12 @@ static int lfsck_namespace_insert_orphan(const struct lu_env *env,
        parent = lfsck->li_lpf_obj;
        pfid = lfsck_dto2fid(parent);
 
-       /* Hold update lock on the parent to prevent others to access. */
-       rc = lfsck_ibits_lock(env, lfsck, parent, &plh,
-                             MDS_INODELOCK_UPDATE, LCK_EX);
-       if (rc != 0)
-               GOTO(log, rc);
-
+again:
        do {
                namelen = snprintf(info->lti_key, NAME_MAX, DFID"%s-%s-%d",
                                   PFID(cfid), infix, type, idx++);
                rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
-                              (const struct dt_key *)info->lti_key,
-                              BYPASS_CAPA);
+                              (const struct dt_key *)info->lti_key);
                if (rc != 0 && rc != -ENOENT)
                        GOTO(log, rc);
 
@@ -955,24 +952,47 @@ static int lfsck_namespace_insert_orphan(const struct lu_env *env,
                        exist = true;
        } while (rc == 0 && !exist);
 
+       rc = lfsck_lock(env, lfsck, parent, info->lti_key, pllh,
+                       MDS_INODELOCK_UPDATE, LCK_PW);
+       if (rc != 0)
+               GOTO(log, rc);
+
+       /* Re-check whether the name conflict with othrs after taken
+        * the ldlm lock. */
+       rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
+                      (const struct dt_key *)info->lti_key);
+       if (rc == 0) {
+               if (!lu_fid_eq(cfid, &tfid)) {
+                       exist = false;
+                       lfsck_unlock(pllh);
+                       goto again;
+               }
+
+               exist = true;
+       } else if (rc != -ENOENT) {
+               GOTO(log, rc);
+       } else {
+               exist = false;
+       }
+
        cname->ln_name = info->lti_key;
        cname->ln_namelen = namelen;
-       rc = linkea_data_new(&ldata, &info->lti_linkea_buf2);
+       rc = linkea_data_new(&ldata2, &info->lti_linkea_buf2);
        if (rc != 0)
                GOTO(log, rc);
 
-       rc = linkea_add_buf(&ldata, cname, pfid);
+       rc = linkea_add_buf(&ldata2, cname, pfid);
        if (rc != 0)
                GOTO(log, rc);
 
        rc = lfsck_ibits_lock(env, lfsck, orphan, &clh,
-                             MDS_INODELOCK_UPDATE | MDS_INODELOCK_LOOKUP,
-                             LCK_EX);
+                             MDS_INODELOCK_UPDATE | MDS_INODELOCK_LOOKUP |
+                             MDS_INODELOCK_XATTR, LCK_EX);
        if (rc != 0)
                GOTO(log, rc);
 
-       lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
-                      ldata.ld_leh->leh_len);
+       lfsck_buf_init(&linkea_buf, ldata2.ld_buf->lb_buf,
+                      ldata2.ld_leh->leh_len);
        th = dt_trans_create(env, dev);
        if (IS_ERR(th))
                GOTO(log, rc = PTR_ERR(th));
@@ -1024,33 +1044,32 @@ static int lfsck_namespace_insert_orphan(const struct lu_env *env,
                GOTO(stop, rc);
 
        dt_write_lock(env, orphan, 0);
-       rc = lfsck_links_read(env, orphan, &ldata);
+       rc = lfsck_links_read2(env, orphan, &ldata2);
        if (likely((rc == -ENODATA) || (rc == -EINVAL) ||
-                  (rc == 0 && ldata.ld_leh->leh_reccount == 0))) {
+                  (rc == 0 && ldata2.ld_leh != NULL &&
+                   ldata2.ld_leh->leh_reccount == 0))) {
                if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
                        GOTO(unlock, rc = 1);
 
                if (S_ISDIR(lfsck_object_type(orphan))) {
                        rc = dt_delete(env, orphan,
-                                      (const struct dt_key *)dotdot, th,
-                                      BYPASS_CAPA);
+                                      (const struct dt_key *)dotdot, th);
                        if (rc != 0)
                                GOTO(unlock, rc);
 
                        rec->rec_type = S_IFDIR;
                        rec->rec_fid = pfid;
                        rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
-                                      (const struct dt_key *)dotdot, th,
-                                      BYPASS_CAPA, 1);
+                                      (const struct dt_key *)dotdot, th, 1);
                        if (rc != 0)
                                GOTO(unlock, rc);
                }
 
                rc = dt_xattr_set(env, orphan, &linkea_buf, XATTR_NAME_LINK, 0,
-                                 th, BYPASS_CAPA);
+                                 th);
        } else {
                if (rc == 0 && count != NULL)
-                       *count = ldata.ld_leh->leh_reccount;
+                       *count = ldata2.ld_leh->leh_reccount;
 
                GOTO(unlock, rc);
        }
@@ -1060,8 +1079,7 @@ static int lfsck_namespace_insert_orphan(const struct lu_env *env,
                rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
                rec->rec_fid = cfid;
                rc = dt_insert(env, parent, (const struct dt_rec *)rec,
-                              (const struct dt_key *)cname->ln_name,
-                              th, BYPASS_CAPA, 1);
+                              (const struct dt_key *)cname->ln_name, th, 1);
                if (rc == 0 && S_ISDIR(rec->rec_type)) {
                        dt_write_lock(env, parent, 0);
                        rc = dt_ref_add(env, parent, th);
@@ -1070,7 +1088,7 @@ static int lfsck_namespace_insert_orphan(const struct lu_env *env,
        }
 
        if (rc == 0)
-               rc = dt_attr_set(env, orphan, la, th, BYPASS_CAPA);
+               rc = dt_attr_set(env, orphan, la, th);
 
        GOTO(stop, rc = (rc == 0 ? 1 : rc));
 
@@ -1082,7 +1100,7 @@ stop:
 
 log:
        lfsck_ibits_unlock(&clh, LCK_EX);
-       lfsck_ibits_unlock(&plh, LCK_EX);
+       lfsck_unlock(pllh);
        CDEBUG(D_LFSCK, "%s: namespace LFSCK insert orphan for the "
               "object "DFID", name = %s: rc = %d\n",
               lfsck_lfsck2name(lfsck), PFID(cfid),
@@ -1129,21 +1147,34 @@ static int lfsck_namespace_insert_normal(const struct lu_env *env,
        struct lu_attr                  *la     = &info->lti_la;
        struct dt_insert_rec            *rec    = &info->lti_dt_rec;
        struct lfsck_instance           *lfsck  = com->lc_lfsck;
+       /* The child and its name may be on different MDTs. */
+       const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
+       const struct lu_fid             *cfid   = lfsck_dto2fid(child);
        struct dt_device                *dev    = lfsck->li_next;
        struct thandle                  *th     = NULL;
-       struct lustre_handle             lh     = { 0 };
+       struct lfsck_lock_handle        *llh    = &info->lti_llh;
        int                              rc     = 0;
        ENTRY;
 
+       /* @parent/@child may be based on lfsck->li_bottom,
+        * but here we need the object based on the lfsck->li_next. */
+
+       parent = lfsck_object_locate(dev, parent);
+       if (IS_ERR(parent))
+               GOTO(log, rc = PTR_ERR(parent));
+
        if (unlikely(!dt_try_as_dir(env, parent)))
                GOTO(log, rc = -ENOTDIR);
 
+       child = lfsck_object_locate(dev, child);
+       if (IS_ERR(child))
+               GOTO(log, rc = PTR_ERR(child));
+
        if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
                GOTO(log, rc = 1);
 
-       /* Hold update lock on the parent to prevent others to access. */
-       rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
-                             MDS_INODELOCK_UPDATE, LCK_EX);
+       rc = lfsck_lock(env, lfsck, parent, name, llh,
+                       MDS_INODELOCK_UPDATE, LCK_PW);
        if (rc != 0)
                GOTO(log, rc);
 
@@ -1152,7 +1183,7 @@ static int lfsck_namespace_insert_normal(const struct lu_env *env,
                GOTO(unlock, rc = PTR_ERR(th));
 
        rec->rec_type = lfsck_object_type(child) & S_IFMT;
-       rec->rec_fid = lfsck_dto2fid(child);
+       rec->rec_fid = cfid;
        rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
                               (const struct dt_key *)name, th);
        if (rc != 0)
@@ -1180,7 +1211,7 @@ static int lfsck_namespace_insert_normal(const struct lu_env *env,
                GOTO(stop, rc);
 
        rc = dt_insert(env, parent, (const struct dt_rec *)rec,
-                      (const struct dt_key *)name, th, BYPASS_CAPA, 1);
+                      (const struct dt_key *)name, th, 1);
        if (rc != 0)
                GOTO(stop, rc);
 
@@ -1193,11 +1224,11 @@ static int lfsck_namespace_insert_normal(const struct lu_env *env,
        }
 
        la->la_ctime = cfs_time_current_sec();
-       rc = dt_attr_set(env, parent, la, th, BYPASS_CAPA);
+       rc = dt_attr_set(env, parent, la, th);
        if (rc != 0)
                GOTO(stop, rc);
 
-       rc = dt_attr_set(env, child, la, th, BYPASS_CAPA);
+       rc = dt_attr_set(env, child, la, th);
 
        GOTO(stop, rc = (rc == 0 ? 1 : rc));
 
@@ -1205,14 +1236,13 @@ stop:
        dt_trans_stop(env, dev, th);
 
 unlock:
-       lfsck_ibits_unlock(&lh, LCK_EX);
+       lfsck_unlock(llh);
 
 log:
        CDEBUG(D_LFSCK, "%s: namespace LFSCK insert object "DFID" with "
               "the name %s and type %o to the parent "DFID": rc = %d\n",
-              lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(child)), name,
-              lfsck_object_type(child) & S_IFMT,
-              PFID(lfsck_dto2fid(parent)), rc);
+              lfsck_lfsck2name(lfsck), PFID(cfid), name,
+              lfsck_object_type(child) & S_IFMT, PFID(pfid), rc);
 
        if (rc != 0) {
                struct lfsck_namespace *ns = com->lc_file_ram;
@@ -1257,11 +1287,10 @@ static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
        struct lu_fid                    tfid;
        struct lfsck_instance           *lfsck  = com->lc_lfsck;
        struct lfsck_namespace          *ns     = com->lc_file_ram;
-       struct dt_device                *dev;
+       struct dt_device                *dev    = lfsck_obj2dev(orphan);
        struct dt_object                *parent = NULL;
-       struct dt_object                *child  = NULL;
        struct thandle                  *th     = NULL;
-       struct lustre_handle             lh     = { 0 };
+       struct lfsck_lock_handle        *llh    = &info->lti_llh;
        struct linkea_data               ldata  = { NULL };
        struct lu_buf                    linkea_buf;
        struct lu_buf                    lmv_buf;
@@ -1269,6 +1298,7 @@ static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
        int                              namelen;
        int                              idx    = 0;
        int                              rc     = 0;
+       int                              rc1    = 0;
        ENTRY;
 
        LASSERT(!dt_object_exists(orphan));
@@ -1287,7 +1317,7 @@ static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
                snprintf(name, 8, "MDT%04x", idx);
                rc = dt_lookup(env, lfsck->li_lpf_root_obj,
                               (struct dt_rec *)&tfid,
-                              (const struct dt_key *)name, BYPASS_CAPA);
+                              (const struct dt_key *)name);
                if (rc != 0)
                        GOTO(log, rc = (rc == -ENOENT ? -ENXIO : rc));
 
@@ -1308,26 +1338,35 @@ static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
        if (IS_ERR(dev))
                GOTO(log, rc = PTR_ERR(dev));
 
-       child = lfsck_object_find_by_dev(env, dev, cfid);
-       if (IS_ERR(child))
-               GOTO(log, rc = PTR_ERR(child));
-
-       /* Hold update lock on the parent to prevent others to access. */
-       rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
-                             MDS_INODELOCK_UPDATE, LCK_EX);
-       if (rc != 0)
-               GOTO(log, rc);
-
        idx = 0;
+
+again:
        do {
                namelen = snprintf(name, 31, DFID"-P-%d",
                                   PFID(cfid), idx++);
                rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
-                              (const struct dt_key *)name, BYPASS_CAPA);
+                              (const struct dt_key *)name);
                if (rc != 0 && rc != -ENOENT)
-                       GOTO(unlock1, rc);
+                       GOTO(log, rc);
        } while (rc == 0);
 
+       rc = lfsck_lock(env, lfsck, parent, name, llh,
+                       MDS_INODELOCK_UPDATE, LCK_PW);
+       if (rc != 0)
+               GOTO(log, rc);
+
+       /* Re-check whether the name conflict with othrs after taken
+        * the ldlm lock. */
+       rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
+                      (const struct dt_key *)name);
+       if (unlikely(rc == 0)) {
+               lfsck_unlock(llh);
+               goto again;
+       }
+
+       if (rc != -ENOENT)
+               GOTO(unlock1, rc);
+
        cname->ln_name = name;
        cname->ln_namelen = namelen;
 
@@ -1336,8 +1375,8 @@ static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
        la->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
                       LA_ATIME | LA_MTIME | LA_CTIME;
 
-       child->do_ops->do_ah_init(env, hint, parent, child,
-                                 la->la_mode & S_IFMT);
+       orphan->do_ops->do_ah_init(env, hint, parent, orphan,
+                                  la->la_mode & S_IFMT);
 
        memset(dof, 0, sizeof(*dof));
        dof->dof_type = dt_mode_to_dft(S_IFDIR);
@@ -1359,39 +1398,36 @@ static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
        if (dt_object_remote(orphan))
                th->th_sync = 1;
 
-       rc = dt_declare_create(env, child, la, hint, dof, th);
+       rc = dt_declare_create(env, orphan, la, hint, dof, th);
        if (rc != 0)
                GOTO(stop, rc);
 
-       if (unlikely(!dt_try_as_dir(env, child)))
+       if (unlikely(!dt_try_as_dir(env, orphan)))
                GOTO(stop, rc = -ENOTDIR);
 
+       rc = dt_declare_ref_add(env, orphan, th);
+       if (rc != 0)
+               GOTO(stop, rc);
+
        rec->rec_type = S_IFDIR;
        rec->rec_fid = cfid;
-       rc = dt_declare_insert(env, child, (const struct dt_rec *)rec,
+       rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
                               (const struct dt_key *)dot, th);
        if (rc != 0)
                GOTO(stop, rc);
 
        rec->rec_fid = lfsck_dto2fid(parent);
-       rc = dt_declare_insert(env, child, (const struct dt_rec *)rec,
+       rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
                               (const struct dt_key *)dotdot, th);
-       if (rc == 0)
-               rc = dt_declare_ref_add(env, child, th);
-
-       if (rc != 0)
-               GOTO(stop, rc);
-
-       rc = dt_declare_ref_add(env, child, th);
        if (rc != 0)
                GOTO(stop, rc);
 
        if (lmv != NULL) {
                lmv->lmv_magic = LMV_MAGIC;
-               lmv->lmv_master_mdt_index = lfsck_dev_idx(dev);
+               lmv->lmv_master_mdt_index = lfsck_dev_idx(lfsck);
                lfsck_lmv_header_cpu_to_le(lmv2, lmv);
                lfsck_buf_init(&lmv_buf, lmv2, sizeof(*lmv2));
-               rc = dt_declare_xattr_set(env, child, &lmv_buf,
+               rc = dt_declare_xattr_set(env, orphan, &lmv_buf,
                                          XATTR_NAME_LMV, 0, th);
                if (rc != 0)
                        GOTO(stop, rc);
@@ -1399,7 +1435,7 @@ static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
 
        lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
                       ldata.ld_leh->leh_len);
-       rc = dt_declare_xattr_set(env, child, &linkea_buf,
+       rc = dt_declare_xattr_set(env, orphan, &linkea_buf,
                                  XATTR_NAME_LINK, 0, th);
        if (rc != 0)
                GOTO(stop, rc);
@@ -1417,44 +1453,42 @@ static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
        if (rc != 0)
                GOTO(stop, rc);
 
-       dt_write_lock(env, child, 0);
-       rc = dt_create(env, child, la, hint, dof, th);
+       dt_write_lock(env, orphan, 0);
+       rc = dt_create(env, orphan, la, hint, dof, th);
        if (rc != 0)
                GOTO(unlock2, rc);
 
-       rec->rec_fid = cfid;
-       rc = dt_insert(env, child, (const struct dt_rec *)rec,
-                      (const struct dt_key *)dot, th, BYPASS_CAPA, 1);
+       rc = dt_ref_add(env, orphan, th);
        if (rc != 0)
                GOTO(unlock2, rc);
 
-       rec->rec_fid = lfsck_dto2fid(parent);
-       rc = dt_insert(env, child, (const struct dt_rec *)rec,
-                      (const struct dt_key *)dotdot, th,
-                      BYPASS_CAPA, 1);
+       rec->rec_fid = cfid;
+       rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
+                      (const struct dt_key *)dot, th, 1);
        if (rc != 0)
                GOTO(unlock2, rc);
 
-       rc = dt_ref_add(env, child, th);
+       rec->rec_fid = lfsck_dto2fid(parent);
+       rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
+                      (const struct dt_key *)dotdot, th, 1);
        if (rc != 0)
                GOTO(unlock2, rc);
 
        if (lmv != NULL) {
-               rc = dt_xattr_set(env, child, &lmv_buf, XATTR_NAME_LMV, 0,
-                                 th, BYPASS_CAPA);
+               rc = dt_xattr_set(env, orphan, &lmv_buf, XATTR_NAME_LMV, 0, th);
                if (rc != 0)
                        GOTO(unlock2, rc);
        }
 
-       rc = dt_xattr_set(env, child, &linkea_buf,
-                         XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
-       dt_write_unlock(env, child);
+       rc = dt_xattr_set(env, orphan, &linkea_buf,
+                         XATTR_NAME_LINK, 0, th);
+       dt_write_unlock(env, orphan);
        if (rc != 0)
                GOTO(stop, rc);
 
        rec->rec_fid = cfid;
        rc = dt_insert(env, parent, (const struct dt_rec *)rec,
-                      (const struct dt_key *)name, th, BYPASS_CAPA, 1);
+                      (const struct dt_key *)name, th, 1);
        if (rc == 0) {
                dt_write_lock(env, parent, 0);
                rc = dt_ref_add(env, parent, th);
@@ -1464,13 +1498,15 @@ static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
        GOTO(stop, rc = (rc == 0 ? 1 : rc));
 
 unlock2:
-       dt_write_unlock(env, child);
+       dt_write_unlock(env, orphan);
 
 stop:
-       dt_trans_stop(env, dev, th);
+       rc1 = dt_trans_stop(env, dev, th);
+       if (rc1 != 0 && rc > 0)
+               rc = rc1;
 
 unlock1:
-       lfsck_ibits_unlock(&lh, LCK_EX);
+       lfsck_unlock(llh);
 
 log:
        CDEBUG(D_LFSCK, "%s: namespace LFSCK create orphan dir for "
@@ -1478,9 +1514,6 @@ log:
               lfsck_lfsck2name(lfsck), PFID(cfid),
               cname->ln_name != NULL ? cname->ln_name : "<NULL>", rc);
 
-       if (child != NULL && !IS_ERR(child))
-               lfsck_object_put(env, child);
-
        if (parent != NULL && !IS_ERR(parent) && parent != lfsck->li_lpf_obj)
                lfsck_object_put(env, parent);
 
@@ -1519,36 +1552,43 @@ static int lfsck_namespace_shrink_linkea(const struct lu_env *env,
                                         bool next)
 {
        struct lfsck_instance           *lfsck     = com->lc_lfsck;
-       struct dt_device                *dev       = lfsck->li_bottom;
+       struct dt_device                *dev       = lfsck_obj2dev(obj);
        struct lfsck_bookmark           *bk        = &lfsck->li_bookmark_ram;
        struct thandle                  *th        = NULL;
        struct lustre_handle             lh        = { 0 };
        struct linkea_data               ldata_new = { NULL };
        struct lu_buf                    linkea_buf;
+       int                              buflen    = 0;
        int                              rc        = 0;
        ENTRY;
 
        rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
-                             MDS_INODELOCK_UPDATE |
-                             MDS_INODELOCK_XATTR, LCK_EX);
+                             MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
+                             LCK_EX);
        if (rc != 0)
                GOTO(log, rc);
 
        if (next)
-               linkea_del_buf(ldata, cname);
+               lfsck_linkea_del_buf(ldata, cname);
        else
                lfsck_namespace_filter_linkea_entry(ldata, cname, pfid,
                                                    true);
-       lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
-                      ldata->ld_leh->leh_len);
+       if (ldata->ld_leh->leh_reccount > 0) {
+               lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
+                              ldata->ld_leh->leh_len);
+               buflen = linkea_buf.lb_len;
+       }
 
 again:
        th = dt_trans_create(env, dev);
        if (IS_ERR(th))
                GOTO(unlock1, rc = PTR_ERR(th));
 
-       rc = dt_declare_xattr_set(env, obj, &linkea_buf,
-                                 XATTR_NAME_LINK, 0, th);
+       if (buflen != 0)
+               rc = dt_declare_xattr_set(env, obj, &linkea_buf,
+                                         XATTR_NAME_LINK, 0, th);
+       else
+               rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, th);
        if (rc != 0)
                GOTO(stop, rc);
 
@@ -1562,7 +1602,8 @@ again:
 
        rc = lfsck_links_read2(env, obj, &ldata_new);
        if (rc != 0)
-               GOTO(unlock2, rc);
+               GOTO(unlock2,
+                    rc = (rc == -ENODATA ? 0 : rc));
 
        /* The specified linkEA entry has been removed by race. */
        rc = linkea_links_find(&ldata_new, cname, pfid);
@@ -1573,12 +1614,12 @@ again:
                GOTO(unlock2, rc = 1);
 
        if (next)
-               linkea_del_buf(&ldata_new, cname);
+               lfsck_linkea_del_buf(&ldata_new, cname);
        else
                lfsck_namespace_filter_linkea_entry(&ldata_new, cname, pfid,
                                                    true);
 
-       if (linkea_buf.lb_len < ldata_new.ld_leh->leh_len) {
+       if (buflen < ldata_new.ld_leh->leh_len) {
                dt_write_unlock(env, obj);
                dt_trans_stop(env, dev, th);
                lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
@@ -1586,10 +1627,14 @@ again:
                goto again;
        }
 
-       lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
-                      ldata_new.ld_leh->leh_len);
-       rc = dt_xattr_set(env, obj, &linkea_buf,
-                         XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
+       if (ldata_new.ld_leh->leh_reccount > 0) {
+               lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
+                              ldata_new.ld_leh->leh_len);
+               rc = dt_xattr_set(env, obj, &linkea_buf,
+                                 XATTR_NAME_LINK, 0, th);
+       } else {
+               rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, th);
+       }
 
        GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
 
@@ -1645,20 +1690,21 @@ static int lfsck_namespace_shrink_linkea_cond(const struct lu_env *env,
                                              struct lu_name *cname,
                                              struct lu_fid *pfid)
 {
-       struct lu_fid           *cfid   = &lfsck_env_info(env)->lti_fid3;
-       struct lustre_handle     lh     = { 0 };
-       int                      rc;
+       struct lfsck_thread_info *info  = lfsck_env_info(env);
+       struct lu_fid            *cfid  = &info->lti_fid3;
+       struct lfsck_lock_handle *llh   = &info->lti_llh;
+       int                       rc;
        ENTRY;
 
-       rc = lfsck_ibits_lock(env, com->lc_lfsck, parent, &lh,
-                             MDS_INODELOCK_UPDATE, LCK_EX);
+       rc = lfsck_lock(env, com->lc_lfsck, parent, cname->ln_name, llh,
+                       MDS_INODELOCK_UPDATE, LCK_PR);
        if (rc != 0)
                RETURN(rc);
 
        dt_read_lock(env, parent, 0);
        if (unlikely(lfsck_is_dead_obj(parent))) {
                dt_read_unlock(env, parent);
-               lfsck_ibits_unlock(&lh, LCK_EX);
+               lfsck_unlock(llh);
                rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
                                                   cname, pfid, true);
 
@@ -1666,8 +1712,7 @@ static int lfsck_namespace_shrink_linkea_cond(const struct lu_env *env,
        }
 
        rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
-                      (const struct dt_key *)cname->ln_name,
-                      BYPASS_CAPA);
+                      (const struct dt_key *)cname->ln_name);
        dt_read_unlock(env, parent);
 
        /* It is safe to release the ldlm lock, because when the logic come
@@ -1677,7 +1722,7 @@ static int lfsck_namespace_shrink_linkea_cond(const struct lu_env *env,
         * has removed the specified linkEA entry by race, then it is OK,
         * because the subsequent lfsck_namespace_shrink_linkea() can handle
         * such case. */
-       lfsck_ibits_unlock(&lh, LCK_EX);
+       lfsck_unlock(llh);
        if (rc == -ENOENT) {
                rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
                                                   cname, pfid, true);
@@ -1736,10 +1781,12 @@ static int lfsck_namespace_replace_cond(const struct lu_env *env,
        struct dt_insert_rec            *rec    = &info->lti_dt_rec;
        struct lu_fid                    tfid;
        struct lfsck_instance           *lfsck  = com->lc_lfsck;
+       /* The child and its name may be on different MDTs. */
        struct dt_device                *dev    = lfsck->li_next;
        const char                      *name   = cname->ln_name;
-       struct dt_object                *obj    = NULL;
-       struct lustre_handle             plh    = { 0 };
+       const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
+       struct dt_object                *cobj   = NULL;
+       struct lfsck_lock_handle        *pllh   = &info->lti_llh;
        struct lustre_handle             clh    = { 0 };
        struct linkea_data               ldata  = { NULL };
        struct thandle                  *th     = NULL;
@@ -1747,8 +1794,18 @@ static int lfsck_namespace_replace_cond(const struct lu_env *env,
        int                              rc     = 0;
        ENTRY;
 
-       rc = lfsck_ibits_lock(env, lfsck, parent, &plh,
-                             MDS_INODELOCK_UPDATE, LCK_EX);
+       /* @parent/@child may be based on lfsck->li_bottom,
+        * but here we need the object based on the lfsck->li_next. */
+
+       parent = lfsck_object_locate(dev, parent);
+       if (IS_ERR(parent))
+               GOTO(log, rc = PTR_ERR(parent));
+
+       if (unlikely(!dt_try_as_dir(env, parent)))
+               GOTO(log, rc = -ENOTDIR);
+
+       rc = lfsck_lock(env, lfsck, parent, name, pllh,
+                       MDS_INODELOCK_UPDATE, LCK_PW);
        if (rc != 0)
                GOTO(log, rc);
 
@@ -1757,9 +1814,9 @@ static int lfsck_namespace_replace_cond(const struct lu_env *env,
                goto replace;
        }
 
-       obj = lfsck_object_find(env, lfsck, cfid);
-       if (IS_ERR(obj)) {
-               rc = PTR_ERR(obj);
+       cobj = lfsck_object_find_by_dev(env, dev, cfid);
+       if (IS_ERR(cobj)) {
+               rc = PTR_ERR(cobj);
                if (rc == -ENOENT) {
                        exist = false;
                        goto replace;
@@ -1768,13 +1825,13 @@ static int lfsck_namespace_replace_cond(const struct lu_env *env,
                GOTO(log, rc);
        }
 
-       if (!dt_object_exists(obj)) {
+       if (!dt_object_exists(cobj)) {
                exist = false;
                goto replace;
        }
 
        rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
-                      (const struct dt_key *)name, BYPASS_CAPA);
+                      (const struct dt_key *)name);
        if (rc == -ENOENT) {
                exist = false;
                goto replace;
@@ -1788,18 +1845,19 @@ static int lfsck_namespace_replace_cond(const struct lu_env *env,
                GOTO(log, rc = 0);
 
        /* lock the object to be destroyed. */
-       rc = lfsck_ibits_lock(env, lfsck, obj, &clh,
+       rc = lfsck_ibits_lock(env, lfsck, cobj, &clh,
                              MDS_INODELOCK_UPDATE |
-                             MDS_INODELOCK_XATTR, LCK_EX);
+                             MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
+                             LCK_EX);
        if (rc != 0)
                GOTO(log, rc);
 
-       if (unlikely(lfsck_is_dead_obj(obj))) {
+       if (unlikely(lfsck_is_dead_obj(cobj))) {
                exist = false;
                goto replace;
        }
 
-       rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
+       rc = dt_attr_get(env, cobj, la);
        if (rc != 0)
                GOTO(log, rc);
 
@@ -1809,8 +1867,7 @@ static int lfsck_namespace_replace_cond(const struct lu_env *env,
                GOTO(log, rc);
 
        if (S_ISREG(la->la_mode)) {
-               rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LOV,
-                                 BYPASS_CAPA);
+               rc = dt_xattr_get(env, cobj, &LU_BUF_NULL, XATTR_NAME_LOV);
                /* If someone has created related OST-object(s),
                 * then keep it. */
                if ((rc > 0) || (rc < 0 && rc != -ENODATA))
@@ -1829,7 +1886,7 @@ replace:
        if (rc != 0)
                GOTO(log, rc);
 
-       rc = linkea_links_find(&ldata, cname, lfsck_dto2fid(parent));
+       rc = linkea_links_find(&ldata, cname, pfid);
        /* Someone moved the child, no need to replace. */
        if (rc != 0)
                GOTO(log, rc = 0);
@@ -1842,7 +1899,7 @@ replace:
                GOTO(log, rc = PTR_ERR(th));
 
        if (exist) {
-               rc = dt_declare_destroy(env, obj, th);
+               rc = dt_declare_destroy(env, cobj, th);
                if (rc != 0)
                        GOTO(stop, rc);
        }
@@ -1858,22 +1915,23 @@ replace:
        if (rc != 0)
                GOTO(stop, rc);
 
-       rc = dt_trans_start(env, dev, th);
+       rc = dt_trans_start_local(env, dev, th);
        if (rc != 0)
                GOTO(stop, rc);
 
        if (exist) {
-               rc = dt_destroy(env, obj, th);
+               rc = dt_destroy(env, cobj, th);
                if (rc != 0)
                        GOTO(stop, rc);
        }
 
        /* The old name entry maybe not exist. */
-       dt_delete(env, parent, (const struct dt_key *)name, th,
-                 BYPASS_CAPA);
+       rc = dt_delete(env, parent, (const struct dt_key *)name, th);
+       if (rc != 0 && rc != -ENOENT)
+               GOTO(stop, rc);
 
        rc = dt_insert(env, parent, (const struct dt_rec *)rec,
-                      (const struct dt_key *)name, th, BYPASS_CAPA, 1);
+                      (const struct dt_key *)name, th, 1);
 
        GOTO(stop, rc = (rc == 0 ? 1 : rc));
 
@@ -1882,16 +1940,16 @@ stop:
 
 log:
        lfsck_ibits_unlock(&clh, LCK_EX);
-       lfsck_ibits_unlock(&plh, LCK_EX);
-       if (obj != NULL && !IS_ERR(obj))
-               lfsck_object_put(env, obj);
+       lfsck_unlock(pllh);
+
+       if (cobj != NULL && !IS_ERR(cobj))
+               lfsck_object_put(env, cobj);
 
        CDEBUG(D_LFSCK, "%s: namespace LFSCK conditionally destroy the "
               "object "DFID" because of conflict with the object "DFID
               " under the parent "DFID" with name %s: rc = %d\n",
               lfsck_lfsck2name(lfsck), PFID(cfid),
-              PFID(lfsck_dto2fid(child)), PFID(lfsck_dto2fid(parent)),
-              name, rc);
+              PFID(lfsck_dto2fid(child)), PFID(pfid), name, rc);
 
        return rc;
 }
@@ -1916,7 +1974,7 @@ int lfsck_namespace_rebuild_linkea(const struct lu_env *env,
                                   struct linkea_data *ldata)
 {
        struct lfsck_instance           *lfsck  = com->lc_lfsck;
-       struct dt_device                *dev    = lfsck->li_bottom;
+       struct dt_device                *dev    = lfsck_obj2dev(obj);
        struct thandle                  *th     = NULL;
        struct lu_buf                    linkea_buf;
        int                              rc     = 0;
@@ -1945,7 +2003,7 @@ int lfsck_namespace_rebuild_linkea(const struct lu_env *env,
                GOTO(unlock, rc = 1);
 
        rc = dt_xattr_set(env, obj, &linkea_buf,
-                         XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
+                         XATTR_NAME_LINK, 0, th);
 
        GOTO(unlock, rc = (rc == 0 ? 1 : rc));
 
@@ -1997,21 +2055,32 @@ int lfsck_namespace_repair_dirent(const struct lu_env *env,
                                  const char *name, const char *name2,
                                  __u16 type, bool update, bool dec)
 {
-       struct dt_insert_rec    *rec    = &lfsck_env_info(env)->lti_dt_rec;
-       const struct lu_fid     *cfid   = lfsck_dto2fid(child);
-       struct lu_fid            tfid;
-       struct lfsck_instance   *lfsck  = com->lc_lfsck;
-       struct dt_device        *dev    = lfsck->li_next;
-       struct thandle          *th     = NULL;
-       struct lustre_handle     lh     = { 0 };
-       int                      rc     = 0;
+       struct lfsck_thread_info        *info   = lfsck_env_info(env);
+       struct dt_insert_rec            *rec    = &info->lti_dt_rec;
+       const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
+       const struct lu_fid             *cfid   = lfsck_dto2fid(child);
+       struct lu_fid                    tfid;
+       struct lfsck_instance           *lfsck  = com->lc_lfsck;
+       struct dt_device                *dev    = lfsck->li_next;
+       struct thandle                  *th     = NULL;
+       struct lfsck_lock_handle        *llh    = &info->lti_llh;
+       struct lustre_handle             lh     = { 0 };
+       int                              rc     = 0;
        ENTRY;
 
+       parent = lfsck_object_locate(dev, parent);
+       if (IS_ERR(parent))
+               GOTO(log, rc = PTR_ERR(parent));
+
        if (unlikely(!dt_try_as_dir(env, parent)))
                GOTO(log, rc = -ENOTDIR);
 
-       rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
-                             MDS_INODELOCK_UPDATE, LCK_EX);
+       if (!update || strcmp(name, name2) == 0)
+               rc = lfsck_lock(env, lfsck, parent, name, llh,
+                               MDS_INODELOCK_UPDATE, LCK_PW);
+       else
+               rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
+                                     MDS_INODELOCK_UPDATE, LCK_PW);
        if (rc != 0)
                GOTO(log, rc);
 
@@ -2033,19 +2102,20 @@ int lfsck_namespace_repair_dirent(const struct lu_env *env,
                        GOTO(stop, rc);
        }
 
-       if (dec) {
+       if (dec && S_ISDIR(type)) {
                rc = dt_declare_ref_del(env, parent, th);
                if (rc != 0)
                        GOTO(stop, rc);
        }
 
-       rc = dt_trans_start(env, dev, th);
+       rc = dt_trans_start_local(env, dev, th);
        if (rc != 0)
                GOTO(stop, rc);
 
+
        dt_write_lock(env, parent, 0);
        rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
-                      (const struct dt_key *)name, BYPASS_CAPA);
+                      (const struct dt_key *)name);
        /* Someone has removed the bad name entry by race. */
        if (rc == -ENOENT)
                GOTO(unlock2, rc = 0);
@@ -2061,21 +2131,19 @@ int lfsck_namespace_repair_dirent(const struct lu_env *env,
        if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
                GOTO(unlock2, rc = 1);
 
-       rc = dt_delete(env, parent, (const struct dt_key *)name, th,
-                      BYPASS_CAPA);
+       rc = dt_delete(env, parent, (const struct dt_key *)name, th);
        if (rc != 0)
                GOTO(unlock2, rc);
 
        if (update) {
                rc = dt_insert(env, parent,
                               (const struct dt_rec *)rec,
-                              (const struct dt_key *)name2, th,
-                              BYPASS_CAPA, 1);
+                              (const struct dt_key *)name2, th, 1);
                if (rc != 0)
                        GOTO(unlock2, rc);
        }
 
-       if (dec) {
+       if (dec && S_ISDIR(type)) {
                rc = dt_ref_del(env, parent, th);
                if (rc != 0)
                        GOTO(unlock2, rc);
@@ -2097,14 +2165,16 @@ stop:
                                             LNTF_CHECK_LINKEA, true);
 
 unlock1:
-       lfsck_ibits_unlock(&lh, LCK_EX);
+       /* It is harmless even if unlock the unused lock_handle */
+       lfsck_ibits_unlock(&lh, LCK_PW);
+       lfsck_unlock(llh);
 
 log:
        CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found bad name "
               "entry for: parent "DFID", child "DFID", name %s, type "
               "in name entry %o, type claimed by child %o. repair it "
-              "by %s with new name2 %s: rc = %d\n", lfsck_lfsck2name(lfsck),
-              PFID(lfsck_dto2fid(parent)), PFID(lfsck_dto2fid(child)),
+              "by %s with new name2 %s: rc = %d\n",
+              lfsck_lfsck2name(lfsck), PFID(pfid), PFID(cfid),
               name, type, update ? lfsck_object_type(child) : 0,
               update ? "updating" : "removing", name2, rc);
 
@@ -2144,7 +2214,7 @@ static int lfsck_namespace_repair_unmatched_pairs(const struct lu_env *env,
        struct lfsck_thread_info        *info   = lfsck_env_info(env);
        struct dt_insert_rec            *rec    = &info->lti_dt_rec;
        struct lfsck_instance           *lfsck  = com->lc_lfsck;
-       struct dt_device                *dev    = lfsck->li_bottom;
+       struct dt_device                *dev    = lfsck_obj2dev(obj);
        struct thandle                  *th     = NULL;
        struct linkea_data               ldata  = { NULL };
        struct lu_buf                    linkea_buf;
@@ -2197,16 +2267,15 @@ static int lfsck_namespace_repair_unmatched_pairs(const struct lu_env *env,
                GOTO(unlock, rc = 1);
 
        /* The old ".." name entry maybe not exist. */
-       dt_delete(env, obj, (const struct dt_key *)dotdot, th,
-                 BYPASS_CAPA);
+       dt_delete(env, obj, (const struct dt_key *)dotdot, th);
 
        rc = dt_insert(env, obj, (const struct dt_rec *)rec,
-                      (const struct dt_key *)dotdot, th, BYPASS_CAPA, 1);
+                      (const struct dt_key *)dotdot, th, 1);
        if (rc != 0)
                GOTO(unlock, rc);
 
        rc = dt_xattr_set(env, obj, &linkea_buf,
-                         XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
+                         XATTR_NAME_LINK, 0, th);
 
        GOTO(unlock, rc = (rc == 0 ? 1 : rc));
 
@@ -2311,6 +2380,7 @@ lfsck_namespace_dsd_orphan(const struct lu_env *env,
  * \param[out] type    to tell the caller what the inconsistency is
  * \param[in] retry    if found inconsistency, but the caller does not hold
  *                     ldlm lock on the @child, then set @retry as true
+ * \param[in] unknown  set if does not know how to repair the inconsistency
  *
  * \retval             positive number for repaired cases
  * \retval             0 if nothing to be repaired
@@ -2324,7 +2394,7 @@ lfsck_namespace_dsd_single(const struct lu_env *env,
                           struct linkea_data *ldata,
                           struct lustre_handle *lh,
                           enum lfsck_namespace_inconsistency_type *type,
-                          bool *retry)
+                          bool *retry, bool *unknown)
 {
        struct lfsck_thread_info *info          = lfsck_env_info(env);
        struct lu_name           *cname         = &info->lti_name;
@@ -2337,9 +2407,11 @@ lfsck_namespace_dsd_single(const struct lu_env *env,
        int                       rc            = 0;
        ENTRY;
 
-       lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid, info->lti_key);
+       rc = lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid,
+                                                info->lti_key,
+                                                sizeof(info->lti_key));
        /* The unique linkEA entry with bad parent will be handled as orphan. */
-       if (!fid_is_sane(&tfid)) {
+       if (rc != 0) {
                if (!lustre_handle_is_used(lh) && retry != NULL)
                        *retry = true;
                else
@@ -2433,7 +2505,7 @@ lost_parent:
                }
 
                GOTO(out, rc);
-       }
+       } /* !dt_object_exists(parent) */
 
        /* The unique linkEA entry with bad parent will be handled as orphan. */
        if (unlikely(!dt_try_as_dir(env, parent))) {
@@ -2447,7 +2519,7 @@ lost_parent:
        }
 
        rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
-                      (const struct dt_key *)cname->ln_name, BYPASS_CAPA);
+                      (const struct dt_key *)cname->ln_name);
        if (rc == -ENOENT) {
                /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT
                 * has ever tried to verify some remote MDT-object that resides
@@ -2519,7 +2591,7 @@ lost_parent:
                }
 
                GOTO(out, rc);
-       }
+       } /* rc == -ENOENT */
 
        if (rc != 0)
                GOTO(out, rc);
@@ -2544,8 +2616,18 @@ lost_parent:
                GOTO(out, rc);
        }
 
-       if (fid_is_zero(pfid))
+       /* Zero FID may because the remote directroy object has invalid linkEA,
+        * or lost linkEA. Under such case, the LFSCK on this MDT does not know
+        * how to repair the inconsistency, but the namespace LFSCK on the MDT
+        * where its name entry resides may has more information (name, FID) to
+        * repair such inconsistency. So here, keep the inconsistency to avoid
+        * some imporper repairing. */
+       if (fid_is_zero(pfid)) {
+               if (unknown)
+                       *unknown = true;
+
                GOTO(out, rc = 0);
+       }
 
        /* The ".." name entry is wrong, update it. */
        if (!lu_fid_eq(pfid, lfsck_dto2fid(parent))) {
@@ -2587,6 +2669,7 @@ out:
  * \param[in,out] lh   ldlm lock handler for the given @child
  * \param[out] type    to tell the caller what the inconsistency is
  * \param[in] lpf      true if the ".." entry is under lost+found/MDTxxxx/
+ * \param[in] unknown  set if does not know how to repair the inconsistency
  *
  * \retval             positive number for repaired cases
  * \retval             0 if nothing to be repaired
@@ -2600,7 +2683,7 @@ lfsck_namespace_dsd_multiple(const struct lu_env *env,
                             struct linkea_data *ldata,
                             struct lustre_handle *lh,
                             enum lfsck_namespace_inconsistency_type *type,
-                            bool lpf)
+                            bool lpf, bool *unknown)
 {
        struct lfsck_thread_info *info          = lfsck_env_info(env);
        struct lu_name           *cname         = &info->lti_name;
@@ -2613,24 +2696,24 @@ lfsck_namespace_dsd_multiple(const struct lu_env *env,
        struct dt_object         *parent        = NULL;
        struct linkea_data        ldata_new     = { NULL };
        int                       dirent_count  = 0;
-       int                       linkea_count  = 0;
        int                       rc            = 0;
        bool                      once          = true;
        ENTRY;
 
 again:
        while (ldata->ld_lee != NULL) {
-               lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid,
-                                                   info->lti_key);
-               /* Drop repeated linkEA entries. */
-               lfsck_namespace_filter_linkea_entry(ldata, cname, &tfid, true);
+               rc = lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid,
+                                                        info->lti_key,
+                                                        sizeof(info->lti_key));
                /* Drop invalid linkEA entry. */
-               if (!fid_is_sane(&tfid)) {
-                       linkea_del_buf(ldata, cname);
-                       linkea_count++;
+               if (rc != 0) {
+                       lfsck_linkea_del_buf(ldata, cname);
                        continue;
                }
 
+               /* Drop repeated linkEA entries. */
+               lfsck_namespace_filter_linkea_entry(ldata, cname, &tfid, true);
+
                /* If current dotdot is the .lustre/lost+found/MDTxxxx/,
                 * then it is possible that: the directry object has ever
                 * been lost, but its name entry was there. In the former
@@ -2660,8 +2743,7 @@ again:
                                 * there is still other chance to make the
                                 * child to be visible via other parent, then
                                 * remove this linkEA entry. */
-                               linkea_del_buf(ldata, cname);
-                               linkea_count++;
+                               lfsck_linkea_del_buf(ldata, cname);
                                continue;
                        }
 
@@ -2671,14 +2753,12 @@ again:
                /* The linkEA entry with bad parent will be removed. */
                if (unlikely(!dt_try_as_dir(env, parent))) {
                        lfsck_object_put(env, parent);
-                       linkea_del_buf(ldata, cname);
-                       linkea_count++;
+                       lfsck_linkea_del_buf(ldata, cname);
                        continue;
                }
 
                rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
-                              (const struct dt_key *)cname->ln_name,
-                              BYPASS_CAPA);
+                              (const struct dt_key *)cname->ln_name);
                *pfid2 = *lfsck_dto2fid(parent);
                if (rc == -ENOENT) {
                        lfsck_object_put(env, parent);
@@ -2694,6 +2774,10 @@ again:
 
                if (lu_fid_eq(&tfid, cfid)) {
                        lfsck_object_put(env, parent);
+                       /* If the parent (that is declared via linkEA entry)
+                        * directory contains the specified child, but such
+                        * parent does not match the dotdot name entry, then
+                        * trust the linkEA. */
                        if (!lu_fid_eq(pfid, pfid2)) {
                                *type = LNIT_UNMATCHED_PAIRS;
                                rc = lfsck_namespace_repair_unmatched_pairs(env,
@@ -2719,15 +2803,15 @@ rebuild:
                        if (rc < 0)
                                RETURN(rc);
 
-                       linkea_del_buf(ldata, cname);
-                       linkea_count++;
+                       lfsck_linkea_del_buf(ldata, cname);
                        linkea_first_entry(ldata);
                        /* There may be some invalid dangling name entries under
                         * other parent directories, remove all of them. */
                        while (ldata->ld_lee != NULL) {
-                               lfsck_namespace_unpack_linkea_entry(ldata,
-                                               cname, &tfid, info->lti_key);
-                               if (!fid_is_sane(&tfid))
+                               rc = lfsck_namespace_unpack_linkea_entry(ldata,
+                                               cname, &tfid, info->lti_key,
+                                               sizeof(info->lti_key));
+                               if (rc != 0)
                                        goto next;
 
                                parent = lfsck_object_find_bottom(env, lfsck,
@@ -2760,13 +2844,13 @@ rebuild:
                                dirent_count += rc;
 
 next:
-                               linkea_del_buf(ldata, cname);
+                               lfsck_linkea_del_buf(ldata, cname);
                        }
 
                        ns->ln_dirent_repaired += dirent_count;
 
                        RETURN(rc);
-               }
+               } /* lu_fid_eq(&tfid, lfsck_dto2fid(child)) */
 
                lfsck_ibits_unlock(lh, LCK_EX);
                /* The name entry references another MDT-object that may be
@@ -2781,17 +2865,13 @@ next:
                if (rc > 0)
                        goto rebuild;
 
-               linkea_del_buf(ldata, cname);
-       }
+               lfsck_linkea_del_buf(ldata, cname);
+       } /* while (ldata->ld_lee != NULL) */
 
        linkea_first_entry(ldata);
        if (ldata->ld_leh->leh_reccount == 1) {
                rc = lfsck_namespace_dsd_single(env, com, child, pfid, ldata,
-                                               lh, type, NULL);
-
-               if (rc == 0 && fid_is_zero(pfid) && linkea_count > 0)
-                       rc = lfsck_namespace_rebuild_linkea(env, com, child,
-                                                           ldata);
+                                               lh, type, NULL, unknown);
 
                RETURN(rc);
        }
@@ -2852,9 +2932,8 @@ static int lfsck_namespace_repair_nlink(const struct lu_env *env,
        struct lu_fid                   *tfid   = &info->lti_fid3;
        struct lfsck_namespace          *ns     = com->lc_file_ram;
        struct lfsck_instance           *lfsck  = com->lc_lfsck;
-       struct dt_device                *dev    = lfsck->li_bottom;
+       struct dt_device                *dev    = lfsck_obj2dev(obj);
        const struct lu_fid             *cfid   = lfsck_dto2fid(obj);
-       struct dt_object                *child  = NULL;
        struct thandle                  *th     = NULL;
        struct linkea_data               ldata  = { NULL };
        struct lustre_handle             lh     = { 0 };
@@ -2865,15 +2944,9 @@ static int lfsck_namespace_repair_nlink(const struct lu_env *env,
        ENTRY;
 
        LASSERT(!dt_object_remote(obj));
-       LASSERT(S_ISREG(lfsck_object_type(obj)));
 
-       child = lfsck_object_find_by_dev(env, dev, cfid);
-       if (IS_ERR(child))
-               GOTO(log, rc = PTR_ERR(child));
-
-       rc = lfsck_ibits_lock(env, lfsck, child, &lh,
-                             MDS_INODELOCK_UPDATE |
-                             MDS_INODELOCK_XATTR, LCK_EX);
+       rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
+                             MDS_INODELOCK_UPDATE, LCK_PW);
        if (rc != 0)
                GOTO(log, rc);
 
@@ -2882,7 +2955,7 @@ static int lfsck_namespace_repair_nlink(const struct lu_env *env,
                GOTO(log, rc = PTR_ERR(th));
 
        la->la_valid = LA_NLINK;
-       rc = dt_declare_attr_set(env, child, la, th);
+       rc = dt_declare_attr_set(env, obj, la, th);
        if (rc != 0)
                GOTO(stop, rc);
 
@@ -2890,7 +2963,7 @@ static int lfsck_namespace_repair_nlink(const struct lu_env *env,
        if (rc != 0)
                GOTO(stop, rc);
 
-       dt_write_lock(env, child, 0);
+       dt_write_lock(env, obj, 0);
        /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT has
         * ever tried to verify some remote MDT-object that resides on this
         * MDT, but this MDT failed to respond such request. So means there
@@ -2904,19 +2977,18 @@ static int lfsck_namespace_repair_nlink(const struct lu_env *env,
        fid_cpu_to_be(tfid, cfid);
        idx = lfsck_sub_trace_file_fid2idx(cfid);
        rc = dt_lookup(env, com->lc_sub_trace_objs[idx].lsto_obj,
-                      (struct dt_rec *)&flags, (const struct dt_key *)tfid,
-                      BYPASS_CAPA);
+                      (struct dt_rec *)&flags, (const struct dt_key *)tfid);
        if (rc != 0)
                GOTO(unlock, rc);
 
        if (flags & LNTF_SKIP_NLINK)
                GOTO(unlock, rc = 0);
 
-       rc = dt_attr_get(env, child, la, BYPASS_CAPA);
+       rc = dt_attr_get(env, obj, la);
        if (rc != 0)
                GOTO(unlock, rc = (rc == -ENOENT ? 0 : rc));
 
-       rc = lfsck_links_read2(env, child, &ldata);
+       rc = lfsck_links_read2(env, obj, &ldata);
        if (rc != 0)
                GOTO(unlock, rc = (rc == -ENODATA ? 0 : rc));
 
@@ -2928,21 +3000,18 @@ static int lfsck_namespace_repair_nlink(const struct lu_env *env,
        if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
                GOTO(unlock, rc = 1);
 
-       rc = dt_attr_set(env, child, la, th, BYPASS_CAPA);
+       rc = dt_attr_set(env, obj, la, th);
 
        GOTO(unlock, rc = (rc == 0 ? 1 : rc));
 
 unlock:
-       dt_write_unlock(env, child);
+       dt_write_unlock(env, obj);
 
 stop:
        dt_trans_stop(env, dev, th);
 
 log:
-       lfsck_ibits_unlock(&lh, LCK_EX);
-       if (child != NULL && !IS_ERR(child))
-               lfsck_object_put(env, child);
-
+       lfsck_ibits_unlock(&lh, LCK_PW);
        CDEBUG(D_LFSCK, "%s: namespace LFSCK repaired the object "DFID"'s "
               "nlink count from %u to %u: rc = %d\n",
               lfsck_lfsck2name(lfsck), PFID(cfid), old, la->la_nlink, rc);
@@ -3061,7 +3130,7 @@ lock:
        }
 
        rc = dt_lookup(env, child, (struct dt_rec *)pfid,
-                      (const struct dt_key *)dotdot, BYPASS_CAPA);
+                      (const struct dt_key *)dotdot);
        if (rc != 0) {
                if (rc != -ENOENT && rc != -ENODATA && rc != -EINVAL) {
                        dt_read_unlock(env, child);
@@ -3135,13 +3204,13 @@ lock:
                }
 
                GOTO(out, rc);
-       }
+       } /* rc != 0 */
 
        linkea_first_entry(&ldata);
        /* This is the most common case: the object has unique linkEA entry. */
        if (ldata.ld_leh->leh_reccount == 1) {
                rc = lfsck_namespace_dsd_single(env, com, child, pfid, &ldata,
-                                               &lh, &type, &retry);
+                                               &lh, &type, &retry, &unknown);
                if (retry) {
                        LASSERT(!lustre_handle_is_used(&lh));
 
@@ -3173,7 +3242,7 @@ lock:
         *    but the LFSCK cannot aware that at that time, then it adds
         *    the bad linkEA entry for further processing. */
        rc = lfsck_namespace_dsd_multiple(env, com, child, pfid, &ldata,
-                                         &lh, &type, lpf);
+                                         &lh, &type, lpf, &unknown);
 
        GOTO(out, rc);
 
@@ -3254,13 +3323,42 @@ static int lfsck_namespace_double_scan_one(const struct lu_env *env,
 
        rc = lfsck_links_read(env, child, &ldata);
        dt_read_unlock(env, child);
+
+       if (rc == -EINVAL) {
+               struct lustre_handle lh = { 0 };
+
+               rc = lfsck_ibits_lock(env, com->lc_lfsck, child, &lh,
+                                     MDS_INODELOCK_UPDATE |
+                                     MDS_INODELOCK_XATTR, LCK_EX);
+               if (rc == 0) {
+                       rc = lfsck_namespace_links_remove(env, com, child);
+                       lfsck_ibits_unlock(&lh, LCK_EX);
+               }
+
+               GOTO(out, rc = (rc == -ENOENT ? 0 : rc));
+       }
+
        if (rc != 0)
                GOTO(out, rc);
 
        linkea_first_entry(&ldata);
        while (ldata.ld_lee != NULL) {
-               lfsck_namespace_unpack_linkea_entry(&ldata, cname, pfid,
-                                                   info->lti_key);
+               rc = lfsck_namespace_unpack_linkea_entry(&ldata, cname, pfid,
+                                                        info->lti_key,
+                                                        sizeof(info->lti_key));
+               /* Invalid PFID in the linkEA entry. */
+               if (rc != 0) {
+                       rc = lfsck_namespace_shrink_linkea(env, com, child,
+                                               &ldata, cname, pfid, true);
+                       if (rc < 0)
+                               GOTO(out, rc);
+
+                       if (rc > 0)
+                               repaired = true;
+
+                       continue;
+               }
+
                rc = lfsck_namespace_filter_linkea_entry(&ldata, cname, pfid,
                                                         false);
                /* Found repeated linkEA entries */
@@ -3278,19 +3376,6 @@ static int lfsck_namespace_double_scan_one(const struct lu_env *env,
                        /* fall through */
                }
 
-               /* Invalid PFID in the linkEA entry. */
-               if (!fid_is_sane(pfid)) {
-                       rc = lfsck_namespace_shrink_linkea(env, com, child,
-                                               &ldata, cname, pfid, true);
-                       if (rc < 0)
-                               GOTO(out, rc);
-
-                       if (rc > 0)
-                               repaired = true;
-
-                       continue;
-               }
-
                parent = lfsck_object_find_bottom(env, lfsck, pfid);
                if (IS_ERR(parent))
                        GOTO(out, rc = PTR_ERR(parent));
@@ -3361,7 +3446,7 @@ lost_parent:
                                repaired = true;
 
                        continue;
-               }
+               } /* !dt_object_exists(parent) */
 
                /* The linkEA entry with bad parent will be removed. */
                if (unlikely(!dt_try_as_dir(env, parent))) {
@@ -3378,8 +3463,7 @@ lost_parent:
                }
 
                rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
-                              (const struct dt_key *)cname->ln_name,
-                              BYPASS_CAPA);
+                              (const struct dt_key *)cname->ln_name);
                if (rc != 0 && rc != -ENOENT) {
                        lfsck_object_put(env, parent);
 
@@ -3422,7 +3506,9 @@ lost_parent:
                        continue;
                }
 
-               rc = dt_attr_get(env, child, la, BYPASS_CAPA);
+               /* The following handles -ENOENT case */
+
+               rc = dt_attr_get(env, child, la);
                if (rc != 0)
                        GOTO(out, rc);
 
@@ -3517,11 +3603,8 @@ out:
        if (rc < 0 && rc != -ENODATA)
                return rc;
 
-       if (rc == 0) {
-               LASSERT(ldata.ld_leh != NULL);
-
+       if (rc == 0 && ldata.ld_leh != NULL)
                count = ldata.ld_leh->leh_reccount;
-       }
 
        if (count == 0) {
                /* If the LFSCK is marked as LF_INCOMPLETE, then means some
@@ -3545,15 +3628,28 @@ out:
                        }
                }
        } else {
-               rc = dt_attr_get(env, child, la, BYPASS_CAPA);
+               rc = dt_attr_get(env, child, la);
                if (rc != 0)
                        return rc;
 
                if (la->la_nlink != 0 && la->la_nlink != count) {
-                       rc = lfsck_namespace_repair_nlink(env, com, child, la);
-                       if (rc > 0) {
-                               ns->ln_objs_nlink_repaired++;
-                               rc = 0;
+                       if (unlikely(!S_ISREG(lfsck_object_type(child)) &&
+                                    !S_ISLNK(lfsck_object_type(child)))) {
+                               CDEBUG(D_LFSCK, "%s: namespace LFSCK finds "
+                                      "the object "DFID"'s nlink count %d "
+                                      "does not match linkEA count %d, "
+                                      "type %o, skip it.\n",
+                                      lfsck_lfsck2name(lfsck),
+                                      PFID(lfsck_dto2fid(child)),
+                                      la->la_nlink, count,
+                                      lfsck_object_type(child));
+                       } else {
+                               rc = lfsck_namespace_repair_nlink(env, com,
+                                                                 child, la);
+                               if (rc > 0) {
+                                       ns->ln_objs_nlink_repaired++;
+                                       rc = 0;
+                               }
                        }
                }
        }
@@ -3576,76 +3672,76 @@ static void lfsck_namespace_dump_statistics(struct seq_file *m,
                                            __u32 time_phase1,
                                            __u32 time_phase2)
 {
-       seq_printf(m, "checked_phase1: "LPU64"\n"
-                     "checked_phase2: "LPU64"\n"
-                     "updated_phase1: "LPU64"\n"
-                     "updated_phase2: "LPU64"\n"
-                     "failed_phase1: "LPU64"\n"
-                     "failed_phase2: "LPU64"\n"
-                     "directories: "LPU64"\n"
-                     "dirent_repaired: "LPU64"\n"
-                     "linkea_repaired: "LPU64"\n"
-                     "nlinks_repaired: "LPU64"\n"
-                     "multiple_linked_checked: "LPU64"\n"
-                     "multiple_linked_repaired: "LPU64"\n"
-                     "unknown_inconsistency: "LPU64"\n"
-                     "unmatched_pairs_repaired: "LPU64"\n"
-                     "dangling_repaired: "LPU64"\n"
-                     "multiple_referenced_repaired: "LPU64"\n"
-                     "bad_file_type_repaired: "LPU64"\n"
-                     "lost_dirent_repaired: "LPU64"\n"
-                     "local_lost_found_scanned: "LPU64"\n"
-                     "local_lost_found_moved: "LPU64"\n"
-                     "local_lost_found_skipped: "LPU64"\n"
-                     "local_lost_found_failed: "LPU64"\n"
-                     "striped_dirs_scanned: "LPU64"\n"
-                     "striped_dirs_repaired: "LPU64"\n"
-                     "striped_dirs_failed: "LPU64"\n"
-                     "striped_dirs_disabled: "LPU64"\n"
-                     "striped_dirs_skipped: "LPU64"\n"
-                     "striped_shards_scanned: "LPU64"\n"
-                     "striped_shards_repaired: "LPU64"\n"
-                     "striped_shards_failed: "LPU64"\n"
-                     "striped_shards_skipped: "LPU64"\n"
-                     "name_hash_repaired: "LPU64"\n"
-                     "success_count: %u\n"
-                     "run_time_phase1: %u seconds\n"
-                     "run_time_phase2: %u seconds\n",
-                     checked_phase1,
-                     checked_phase2,
-                     ns->ln_items_repaired,
-                     ns->ln_objs_repaired_phase2,
-                     ns->ln_items_failed,
-                     ns->ln_objs_failed_phase2,
-                     ns->ln_dirs_checked,
-                     ns->ln_dirent_repaired,
-                     ns->ln_linkea_repaired,
-                     ns->ln_objs_nlink_repaired,
-                     ns->ln_mul_linked_checked,
-                     ns->ln_mul_linked_repaired,
-                     ns->ln_unknown_inconsistency,
-                     ns->ln_unmatched_pairs_repaired,
-                     ns->ln_dangling_repaired,
-                     ns->ln_mul_ref_repaired,
-                     ns->ln_bad_type_repaired,
-                     ns->ln_lost_dirent_repaired,
-                     ns->ln_local_lpf_scanned,
-                     ns->ln_local_lpf_moved,
-                     ns->ln_local_lpf_skipped,
-                     ns->ln_local_lpf_failed,
-                     ns->ln_striped_dirs_scanned,
-                     ns->ln_striped_dirs_repaired,
-                     ns->ln_striped_dirs_failed,
-                     ns->ln_striped_dirs_disabled,
-                     ns->ln_striped_dirs_skipped,
-                     ns->ln_striped_shards_scanned,
-                     ns->ln_striped_shards_repaired,
-                     ns->ln_striped_shards_failed,
-                     ns->ln_striped_shards_skipped,
-                     ns->ln_name_hash_repaired,
-                     ns->ln_success_count,
-                     time_phase1,
-                     time_phase2);
+       seq_printf(m, "checked_phase1: %llu\n"
+                  "checked_phase2: %llu\n"
+                  "updated_phase1: %llu\n"
+                  "updated_phase2: %llu\n"
+                  "failed_phase1: %llu\n"
+                  "failed_phase2: %llu\n"
+                  "directories: %llu\n"
+                  "dirent_repaired: %llu\n"
+                  "linkea_repaired: %llu\n"
+                  "nlinks_repaired: %llu\n"
+                  "multiple_linked_checked: %llu\n"
+                  "multiple_linked_repaired: %llu\n"
+                  "unknown_inconsistency: %llu\n"
+                  "unmatched_pairs_repaired: %llu\n"
+                  "dangling_repaired: %llu\n"
+                  "multiple_referenced_repaired: %llu\n"
+                  "bad_file_type_repaired: %llu\n"
+                  "lost_dirent_repaired: %llu\n"
+                  "local_lost_found_scanned: %llu\n"
+                  "local_lost_found_moved: %llu\n"
+                  "local_lost_found_skipped: %llu\n"
+                  "local_lost_found_failed: %llu\n"
+                  "striped_dirs_scanned: %llu\n"
+                  "striped_dirs_repaired: %llu\n"
+                  "striped_dirs_failed: %llu\n"
+                  "striped_dirs_disabled: %llu\n"
+                  "striped_dirs_skipped: %llu\n"
+                  "striped_shards_scanned: %llu\n"
+                  "striped_shards_repaired: %llu\n"
+                  "striped_shards_failed: %llu\n"
+                  "striped_shards_skipped: %llu\n"
+                  "name_hash_repaired: %llu\n"
+                  "success_count: %u\n"
+                  "run_time_phase1: %u seconds\n"
+                  "run_time_phase2: %u seconds\n",
+                  checked_phase1,
+                  checked_phase2,
+                  ns->ln_items_repaired,
+                  ns->ln_objs_repaired_phase2,
+                  ns->ln_items_failed,
+                  ns->ln_objs_failed_phase2,
+                  ns->ln_dirs_checked,
+                  ns->ln_dirent_repaired,
+                  ns->ln_linkea_repaired,
+                  ns->ln_objs_nlink_repaired,
+                  ns->ln_mul_linked_checked,
+                  ns->ln_mul_linked_repaired,
+                  ns->ln_unknown_inconsistency,
+                  ns->ln_unmatched_pairs_repaired,
+                  ns->ln_dangling_repaired,
+                  ns->ln_mul_ref_repaired,
+                  ns->ln_bad_type_repaired,
+                  ns->ln_lost_dirent_repaired,
+                  ns->ln_local_lpf_scanned,
+                  ns->ln_local_lpf_moved,
+                  ns->ln_local_lpf_skipped,
+                  ns->ln_local_lpf_failed,
+                  ns->ln_striped_dirs_scanned,
+                  ns->ln_striped_dirs_repaired,
+                  ns->ln_striped_dirs_failed,
+                  ns->ln_striped_dirs_disabled,
+                  ns->ln_striped_dirs_skipped,
+                  ns->ln_striped_shards_scanned,
+                  ns->ln_striped_shards_repaired,
+                  ns->ln_striped_shards_failed,
+                  ns->ln_striped_shards_skipped,
+                  ns->ln_name_hash_repaired,
+                  ns->ln_success_count,
+                  time_phase1,
+                  time_phase2);
 }
 
 static void lfsck_namespace_release_lmv(const struct lu_env *env,
@@ -3678,7 +3774,7 @@ static int lfsck_namespace_check_for_double_scan(const struct lu_env *env,
        struct lu_attr *la = &lfsck_env_info(env)->lti_la;
        int             rc;
 
-       rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
+       rc = dt_attr_get(env, obj, la);
        if (rc != 0)
                return rc;
 
@@ -3735,7 +3831,7 @@ static int lfsck_namespace_reset(const struct lu_env *env,
        lfsck_object_put(env, com->lc_obj);
        com->lc_obj = NULL;
        dto = lfsck_namespace_load_one_trace_file(env, com, root,
-                               LFSCK_NAMESPACE, NULL, true);
+                                                 LFSCK_NAMESPACE, true);
        if (IS_ERR(dto))
                GOTO(out, rc = PTR_ERR(dto));
 
@@ -3747,7 +3843,7 @@ static int lfsck_namespace_reset(const struct lu_env *env,
        lad->lad_incomplete = 0;
        CFS_RESET_BITMAP(lad->lad_bitmap);
 
-       rc = lfsck_namespace_store(env, com, true);
+       rc = lfsck_namespace_store(env, com);
 
        GOTO(out, rc);
 
@@ -3755,7 +3851,7 @@ out:
        up_write(&com->lc_sem);
 
 put:
-       lu_object_put(env, &root->do_lu);
+       lfsck_object_put(env, root);
 log:
        CDEBUG(D_LFSCK, "%s: namespace LFSCK reset: rc = %d\n",
               lfsck_lfsck2name(lfsck), rc);
@@ -3780,6 +3876,7 @@ static void lfsck_namespace_close_dir(const struct lu_env *env,
 {
        struct lfsck_namespace          *ns     = com->lc_file_ram;
        struct lfsck_assistant_data     *lad    = com->lc_data;
+       struct lfsck_assistant_object   *lso    = NULL;
        struct lfsck_instance           *lfsck  = com->lc_lfsck;
        struct lfsck_lmv                *llmv   = lfsck->li_lmv;
        struct lfsck_namespace_req      *lnr;
@@ -3798,13 +3895,21 @@ static void lfsck_namespace_close_dir(const struct lu_env *env,
                RETURN_EXIT;
        }
 
+       lso = lfsck_assistant_object_init(env, lfsck_dto2fid(lfsck->li_obj_dir),
+                       NULL, lfsck->li_pos_current.lp_oit_cookie, true);
+       if (IS_ERR(lso)) {
+               OBD_FREE(lnr, size);
+               ns->ln_striped_dirs_skipped++;
+
+               RETURN_EXIT;
+       }
+
        /* Generate a dummy request to indicate that all shards' name entry
         * in this striped directory has been scanned for the first time. */
        INIT_LIST_HEAD(&lnr->lnr_lar.lar_list);
-       lnr->lnr_obj = lfsck_object_get(lfsck->li_obj_dir);
+       lnr->lnr_lar.lar_parent = lso;
        lnr->lnr_lmv = lfsck_lmv_get(llmv);
        lnr->lnr_fid = *lfsck_dto2fid(lfsck->li_obj_dir);
-       lnr->lnr_oit_cookie = lfsck->li_pos_current.lp_oit_cookie;
        lnr->lnr_dir_cookie = MDS_DIR_END_OFF;
        lnr->lnr_size = size;
 
@@ -3844,10 +3949,9 @@ static int lfsck_namespace_open_dir(const struct lu_env *env,
        if (llmv->ll_lmv_master) {
                struct lmv_mds_md_v1 *lmv = &llmv->ll_lmv;
 
-               if (lmv->lmv_master_mdt_index !=
-                   lfsck_dev_idx(lfsck->li_bottom)) {
+               if (lmv->lmv_master_mdt_index != lfsck_dev_idx(lfsck)) {
                        lmv->lmv_master_mdt_index =
-                               lfsck_dev_idx(lfsck->li_bottom);
+                               lfsck_dev_idx(lfsck);
                        ns->ln_flags |= LF_INCONSISTENT;
                        llmv->ll_lmv_updated = 1;
                }
@@ -3884,15 +3988,15 @@ static int lfsck_namespace_checkpoint(const struct lu_env *env,
                com->lc_new_checked = 0;
        }
 
-       rc = lfsck_namespace_store(env, com, false);
+       rc = lfsck_namespace_store(env, com);
        up_write(&com->lc_sem);
 
 log:
-       CDEBUG(D_LFSCK, "%s: namespace LFSCK checkpoint at the pos ["LPU64
-              ", "DFID", "LPX64"]: rc = %d\n", lfsck_lfsck2name(lfsck),
-              lfsck->li_pos_current.lp_oit_cookie,
+       CDEBUG(D_LFSCK, "%s: namespace LFSCK checkpoint at the pos [%llu"
+              ", "DFID", %#llx], status = %d: rc = %d\n",
+              lfsck_lfsck2name(lfsck), lfsck->li_pos_current.lp_oit_cookie,
               PFID(&lfsck->li_pos_current.lp_dir_parent),
-              lfsck->li_pos_current.lp_dir_cookie, rc);
+              lfsck->li_pos_current.lp_dir_cookie, ns->ln_status, rc);
 
        return rc > 0 ? 0 : rc;
 }
@@ -3990,8 +4094,8 @@ static int lfsck_namespace_prep(const struct lu_env *env,
 
        rc = lfsck_start_assistant(env, com, lsp);
 
-       CDEBUG(D_LFSCK, "%s: namespace LFSCK prep done, start pos ["LPU64", "
-              DFID", "LPX64"]: rc = %d\n",
+       CDEBUG(D_LFSCK, "%s: namespace LFSCK prep done, start pos [%llu, "
+              DFID", %#llx]: rc = %d\n",
               lfsck_lfsck2name(lfsck), pos->lp_oit_cookie,
               PFID(&pos->lp_dir_parent), pos->lp_dir_cookie, rc);
 
@@ -4009,11 +4113,9 @@ static int lfsck_namespace_exec_oit(const struct lu_env *env,
        struct lu_fid            *pfid  = &info->lti_fid2;
        struct lu_name           *cname = &info->lti_name;
        struct lu_seq_range      *range = &info->lti_range;
-       struct dt_device         *dev   = lfsck->li_bottom;
-       struct seq_server_site   *ss    =
-                               lu_site2seq(dev->dd_lu_dev.ld_site);
+       struct seq_server_site   *ss    = lfsck_dev_site(lfsck);
        struct linkea_data        ldata = { NULL };
-       __u32                     idx   = lfsck_dev_idx(dev);
+       __u32                     idx   = lfsck_dev_idx(lfsck);
        int                       rc;
        ENTRY;
 
@@ -4080,7 +4182,6 @@ static int lfsck_namespace_exec_oit(const struct lu_env *env,
 
 out:
        down_write(&com->lc_sem);
-       com->lc_new_checked++;
        if (S_ISDIR(lfsck_object_type(obj)))
                ns->ln_dirs_checked++;
        if (rc != 0)
@@ -4092,6 +4193,7 @@ out:
 
 static int lfsck_namespace_exec_dir(const struct lu_env *env,
                                    struct lfsck_component *com,
+                                   struct lfsck_assistant_object *lso,
                                    struct lu_dirent *ent, __u16 type)
 {
        struct lfsck_assistant_data     *lad     = com->lc_data;
@@ -4104,7 +4206,6 @@ static int lfsck_namespace_exec_dir(const struct lu_env *env,
        bool                             wakeup  = false;
 
        l_wait_event(mthread->t_ctl_waitq,
-                    bk->lb_async_windows == 0 ||
                     lad->lad_prefetched < bk->lb_async_windows ||
                     !thread_is_running(mthread) ||
                     thread_is_stopped(athread),
@@ -4117,7 +4218,7 @@ static int lfsck_namespace_exec_dir(const struct lu_env *env,
        if (unlikely(lfsck_is_dead_obj(lfsck->li_obj_dir)))
                return 0;
 
-       lnr = lfsck_namespace_assistant_req_init(com->lc_lfsck, ent, type);
+       lnr = lfsck_namespace_assistant_req_init(com->lc_lfsck, lso, ent, type);
        if (IS_ERR(lnr)) {
                struct lfsck_namespace *ns = com->lc_file_ram;
 
@@ -4195,7 +4296,7 @@ static int lfsck_namespace_post(const struct lu_env *env,
                com->lc_new_checked = 0;
        }
 
-       rc = lfsck_namespace_store(env, com, false);
+       rc = lfsck_namespace_store(env, com);
        up_write(&com->lc_sem);
 
        CDEBUG(D_LFSCK, "%s: namespace LFSCK post done: rc = %d\n",
@@ -4204,14 +4305,13 @@ static int lfsck_namespace_post(const struct lu_env *env,
        RETURN(rc);
 }
 
-static int
+static void
 lfsck_namespace_dump(const struct lu_env *env, struct lfsck_component *com,
                     struct seq_file *m)
 {
        struct lfsck_instance   *lfsck = com->lc_lfsck;
        struct lfsck_bookmark   *bk    = &lfsck->li_bookmark_ram;
        struct lfsck_namespace  *ns    = com->lc_file_ram;
-       int                      rc;
 
        down_read(&com->lc_sem);
        seq_printf(m, "name: lfsck_namespace\n"
@@ -4220,45 +4320,25 @@ lfsck_namespace_dump(const struct lu_env *env, struct lfsck_component *com,
                   "status: %s\n",
                   ns->ln_magic,
                   bk->lb_version,
-                  lfsck_status2names(ns->ln_status));
+                  lfsck_status2name(ns->ln_status));
 
-       rc = lfsck_bits_dump(m, ns->ln_flags, lfsck_flags_names, "flags");
-       if (rc < 0)
-               goto out;
+       lfsck_bits_dump(m, ns->ln_flags, lfsck_flags_names, "flags");
 
-       rc = lfsck_bits_dump(m, bk->lb_param, lfsck_param_names, "param");
-       if (rc < 0)
-               goto out;
+       lfsck_bits_dump(m, bk->lb_param, lfsck_param_names, "param");
 
-       rc = lfsck_time_dump(m, ns->ln_time_last_complete,
-                            "time_since_last_completed");
-       if (rc < 0)
-               goto out;
+       lfsck_time_dump(m, ns->ln_time_last_complete, "last_completed");
 
-       rc = lfsck_time_dump(m, ns->ln_time_latest_start,
-                            "time_since_latest_start");
-       if (rc < 0)
-               goto out;
+       lfsck_time_dump(m, ns->ln_time_latest_start, "latest_start");
 
-       rc = lfsck_time_dump(m, ns->ln_time_last_checkpoint,
-                            "time_since_last_checkpoint");
-       if (rc < 0)
-               goto out;
+       lfsck_time_dump(m, ns->ln_time_last_checkpoint, "last_checkpoint");
 
-       rc = lfsck_pos_dump(m, &ns->ln_pos_latest_start,
-                           "latest_start_position");
-       if (rc < 0)
-               goto out;
+       lfsck_pos_dump(m, &ns->ln_pos_latest_start, "latest_start_position");
 
-       rc = lfsck_pos_dump(m, &ns->ln_pos_last_checkpoint,
-                           "last_checkpoint_position");
-       if (rc < 0)
-               goto out;
+       lfsck_pos_dump(m, &ns->ln_pos_last_checkpoint,
+                      "last_checkpoint_position");
 
-       rc = lfsck_pos_dump(m, &ns->ln_pos_first_inconsistent,
-                           "first_failure_position");
-       if (rc < 0)
-               goto out;
+       lfsck_pos_dump(m, &ns->ln_pos_first_inconsistent,
+                      "first_failure_position");
 
        if (ns->ln_status == LS_SCANNING_PHASE1) {
                struct lfsck_position pos;
@@ -4274,18 +4354,19 @@ lfsck_namespace_dump(const struct lu_env *env, struct lfsck_component *com,
 
                if (duration != 0)
                        do_div(new_checked, duration);
+
                if (rtime != 0)
                        do_div(speed, rtime);
-               lfsck_namespace_dump_statistics(m, ns, checked,
-                                               ns->ln_objs_checked_phase2,
-                                               rtime, ns->ln_run_time_phase2);
 
-               seq_printf(m, "average_speed_phase1: "LPU64" items/sec\n"
-                             "average_speed_phase2: N/A\n"
-                             "real_time_speed_phase1: "LPU64" items/sec\n"
-                             "real_time_speed_phase2: N/A\n",
-                             speed,
-                             new_checked);
+               lfsck_namespace_dump_statistics(m, ns, checked, 0, rtime, 0);
+               seq_printf(m, "average_speed_phase1: %llu items/sec\n"
+                          "average_speed_phase2: N/A\n"
+                          "average_speed_total: %llu items/sec\n"
+                          "real_time_speed_phase1: %llu items/sec\n"
+                          "real_time_speed_phase2: N/A\n",
+                          speed,
+                          speed,
+                          new_checked);
 
                LASSERT(lfsck->li_di_oit != NULL);
 
@@ -4317,59 +4398,83 @@ lfsck_namespace_dump(const struct lu_env *env, struct lfsck_component *com,
                lfsck_pos_dump(m, &pos, "current_position");
        } else if (ns->ln_status == LS_SCANNING_PHASE2) {
                cfs_duration_t duration = cfs_time_current() -
-                                         lfsck->li_time_last_checkpoint;
+                                         com->lc_time_last_checkpoint;
                __u64 checked = ns->ln_objs_checked_phase2 +
                                com->lc_new_checked;
                __u64 speed1 = ns->ln_items_checked;
                __u64 speed2 = checked;
+               __u64 speed0 = speed1 + speed2;
                __u64 new_checked = com->lc_new_checked *
                                    msecs_to_jiffies(MSEC_PER_SEC);
                __u32 rtime = ns->ln_run_time_phase2 +
                              cfs_duration_sec(duration + HALF_SEC);
+               __u32 time0 = ns->ln_run_time_phase1 + rtime;
 
                if (duration != 0)
                        do_div(new_checked, duration);
+
                if (ns->ln_run_time_phase1 != 0)
                        do_div(speed1, ns->ln_run_time_phase1);
+               else if (ns->ln_items_checked != 0)
+                       time0++;
+
                if (rtime != 0)
                        do_div(speed2, rtime);
+               else if (checked != 0)
+                       time0++;
+
+               if (time0 != 0)
+                       do_div(speed0, time0);
+
                lfsck_namespace_dump_statistics(m, ns, ns->ln_items_checked,
                                                checked,
                                                ns->ln_run_time_phase1, rtime);
-
-               seq_printf(m, "average_speed_phase1: "LPU64" items/sec\n"
-                             "average_speed_phase2: "LPU64" objs/sec\n"
-                             "real_time_speed_phase1: N/A\n"
-                             "real_time_speed_phase2: "LPU64" objs/sec\n"
-                             "current_position: "DFID"\n",
-                             speed1,
-                             speed2,
-                             new_checked,
-                             PFID(&ns->ln_fid_latest_scanned_phase2));
+               seq_printf(m, "average_speed_phase1: %llu items/sec\n"
+                          "average_speed_phase2: %llu objs/sec\n"
+                          "average_speed_total: %llu items/sec\n"
+                          "real_time_speed_phase1: N/A\n"
+                          "real_time_speed_phase2: %llu objs/sec\n"
+                          "current_position: "DFID"\n",
+                          speed1,
+                          speed2,
+                          speed0,
+                          new_checked,
+                          PFID(&ns->ln_fid_latest_scanned_phase2));
        } else {
                __u64 speed1 = ns->ln_items_checked;
                __u64 speed2 = ns->ln_objs_checked_phase2;
+               __u64 speed0 = speed1 + speed2;
+               __u32 time0 = ns->ln_run_time_phase1 + ns->ln_run_time_phase2;
 
                if (ns->ln_run_time_phase1 != 0)
                        do_div(speed1, ns->ln_run_time_phase1);
+               else if (ns->ln_items_checked != 0)
+                       time0++;
+
                if (ns->ln_run_time_phase2 != 0)
                        do_div(speed2, ns->ln_run_time_phase2);
+               else if (ns->ln_objs_checked_phase2 != 0)
+                       time0++;
+
+               if (time0 != 0)
+                       do_div(speed0, time0);
+
                lfsck_namespace_dump_statistics(m, ns, ns->ln_items_checked,
                                                ns->ln_objs_checked_phase2,
                                                ns->ln_run_time_phase1,
                                                ns->ln_run_time_phase2);
-
-               seq_printf(m, "average_speed_phase1: "LPU64" items/sec\n"
-                             "average_speed_phase2: "LPU64" objs/sec\n"
-                             "real_time_speed_phase1: N/A\n"
-                             "real_time_speed_phase2: N/A\n"
-                             "current_position: N/A\n",
-                             speed1,
-                             speed2);
+               seq_printf(m, "average_speed_phase1: %llu items/sec\n"
+                          "average_speed_phase2: %llu objs/sec\n"
+                          "average_speed_total: %llu items/sec\n"
+                          "real_time_speed_phase1: N/A\n"
+                          "real_time_speed_phase2: N/A\n"
+                          "current_position: N/A\n",
+                          speed1,
+                          speed2,
+                          speed0);
        }
-out:
+
        up_read(&com->lc_sem);
-       return 0;
 }
 
 static int lfsck_namespace_double_scan(const struct lu_env *env,
@@ -4475,7 +4580,7 @@ static int lfsck_namespace_in_notify(const struct lu_env *env,
        struct lfsck_assistant_data     *lad   = com->lc_data;
        struct lfsck_tgt_descs          *ltds  = &lfsck->li_mdt_descs;
        struct lfsck_tgt_desc           *ltd;
-       int                              rc;
+       int                              rc    = 0;
        bool                             fail  = false;
        ENTRY;
 
@@ -4517,7 +4622,7 @@ static int lfsck_namespace_in_notify(const struct lu_env *env,
                fid_cpu_to_be(key, &lr->lr_fid);
                mutex_lock(&com->lc_sub_trace_objs[idx].lsto_mutex);
                rc = dt_lookup(env, obj, (struct dt_rec *)&flags,
-                              (const struct dt_key *)key, BYPASS_CAPA);
+                              (const struct dt_key *)key);
                if (rc == 0) {
                        if (flags & LNTF_SKIP_NLINK) {
                                mutex_unlock(
@@ -4534,13 +4639,13 @@ static int lfsck_namespace_in_notify(const struct lu_env *env,
                flags |= LNTF_SKIP_NLINK;
                if (exist) {
                        rc = dt_delete(env, obj, (const struct dt_key *)key,
-                                      th, BYPASS_CAPA);
+                                      th);
                        if (rc != 0)
                                GOTO(log, rc);
                }
 
                rc = dt_insert(env, obj, (const struct dt_rec *)&flags,
-                              (const struct dt_key *)key, th, BYPASS_CAPA, 1);
+                              (const struct dt_key *)key, th, 1);
 
                GOTO(log, rc);
 
@@ -4562,12 +4667,14 @@ log:
        case LE_SET_LMV_MASTER: {
                struct dt_object        *obj;
 
-               obj = lfsck_object_find_by_dev(env, lfsck->li_bottom,
-                                              &lr->lr_fid);
+               obj = lfsck_object_find_bottom(env, lfsck, &lr->lr_fid);
                if (IS_ERR(obj))
                        RETURN(PTR_ERR(obj));
 
-               rc = lfsck_namespace_notify_lmv_master_local(env, com, obj);
+               if (likely(dt_object_exists(obj)))
+                       rc = lfsck_namespace_notify_lmv_master_local(env, com,
+                                                                    obj);
+
                lfsck_object_put(env, obj);
 
                RETURN(rc > 0 ? 0 : rc);
@@ -4594,7 +4701,7 @@ log:
               lr->lr_index, lr->lr_status, lr->lr_flags2);
 
        spin_lock(&ltds->ltd_lock);
-       ltd = LTD_TGT(ltds, lr->lr_index);
+       ltd = lfsck_ltd2tgt(ltds, lr->lr_index);
        if (ltd == NULL) {
                spin_unlock(&ltds->ltd_lock);
 
@@ -4659,12 +4766,81 @@ log:
        RETURN(0);
 }
 
+static void lfsck_namespace_repaired(struct lfsck_namespace *ns, __u64 *count)
+{
+       *count += ns->ln_objs_nlink_repaired;
+       *count += ns->ln_dirent_repaired;
+       *count += ns->ln_linkea_repaired;
+       *count += ns->ln_mul_linked_repaired;
+       *count += ns->ln_unmatched_pairs_repaired;
+       *count += ns->ln_dangling_repaired;
+       *count += ns->ln_mul_ref_repaired;
+       *count += ns->ln_bad_type_repaired;
+       *count += ns->ln_lost_dirent_repaired;
+       *count += ns->ln_striped_dirs_disabled;
+       *count += ns->ln_striped_dirs_repaired;
+       *count += ns->ln_striped_shards_repaired;
+       *count += ns->ln_name_hash_repaired;
+       *count += ns->ln_local_lpf_moved;
+}
+
+static int lfsck_namespace_query_all(const struct lu_env *env,
+                                    struct lfsck_component *com,
+                                    __u32 *mdts_count, __u64 *repaired)
+{
+       struct lfsck_namespace *ns = com->lc_file_ram;
+       struct lfsck_tgt_descs *ltds = &com->lc_lfsck->li_mdt_descs;
+       struct lfsck_tgt_desc *ltd;
+       int idx;
+       int rc;
+       ENTRY;
+
+       rc = lfsck_query_all(env, com);
+       if (rc != 0)
+               RETURN(rc);
+
+       down_read(&ltds->ltd_rw_sem);
+       cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
+               ltd = lfsck_ltd2tgt(ltds, idx);
+               LASSERT(ltd != NULL);
+
+               mdts_count[ltd->ltd_namespace_status]++;
+               *repaired += ltd->ltd_namespace_repaired;
+       }
+       up_read(&ltds->ltd_rw_sem);
+
+       down_read(&com->lc_sem);
+       mdts_count[ns->ln_status]++;
+       lfsck_namespace_repaired(ns, repaired);
+       up_read(&com->lc_sem);
+
+       RETURN(0);
+}
+
 static int lfsck_namespace_query(const struct lu_env *env,
-                                struct lfsck_component *com)
+                                struct lfsck_component *com,
+                                struct lfsck_request *req,
+                                struct lfsck_reply *rep,
+                                struct lfsck_query *que, int idx)
 {
        struct lfsck_namespace *ns = com->lc_file_ram;
+       int rc = 0;
+
+       if (que != NULL) {
+               LASSERT(com->lc_lfsck->li_master);
 
-       return ns->ln_status;
+               rc = lfsck_namespace_query_all(env, com,
+                                              que->lu_mdts_count[idx],
+                                              &que->lu_repaired[idx]);
+       } else {
+               down_read(&com->lc_sem);
+               rep->lr_status = ns->ln_status;
+               if (req->lr_flags & LEF_QUERY_ALL)
+                       lfsck_namespace_repaired(ns, &rep->lr_repaired);
+               up_read(&com->lc_sem);
+       }
+
+       return rc;
 }
 
 static struct lfsck_operations lfsck_namespace_ops = {
@@ -4700,6 +4876,8 @@ static struct lfsck_operations lfsck_namespace_ops = {
  *
  * \param[in] env      pointer to the thread context
  * \param[in] com      pointer to the lfsck component
+ * \param[in] parent   pointer to the dir object that contains the dangling
+ *                     name entry
  * \param[in] child    pointer to the object corresponding to the dangling
  *                     name entry
  * \param[in] lnr      pointer to the namespace request that contains the
@@ -4711,6 +4889,7 @@ static struct lfsck_operations lfsck_namespace_ops = {
  */
 int lfsck_namespace_repair_dangling(const struct lu_env *env,
                                    struct lfsck_component *com,
+                                   struct dt_object *parent,
                                    struct dt_object *child,
                                    struct lfsck_namespace_req *lnr)
 {
@@ -4720,15 +4899,16 @@ int lfsck_namespace_repair_dangling(const struct lu_env *env,
        struct dt_object_format         *dof    = &info->lti_dof;
        struct dt_insert_rec            *rec    = &info->lti_dt_rec;
        struct lmv_mds_md_v1            *lmv2   = &info->lti_lmv2;
-       struct dt_object                *parent = lnr->lnr_obj;
        const struct lu_name            *cname;
+       const struct lu_fid             *pfid   = lfsck_dto2fid(parent);
+       const struct lu_fid             *cfid   = lfsck_dto2fid(child);
        struct linkea_data               ldata  = { NULL };
-       struct lustre_handle             lh     = { 0 };
+       struct lfsck_lock_handle        *llh    = &info->lti_llh;
        struct lu_buf                    linkea_buf;
        struct lu_buf                    lmv_buf;
        struct lfsck_instance           *lfsck  = com->lc_lfsck;
        struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
-       struct dt_device                *dev    = lfsck_obj2dt_dev(child);
+       struct dt_device                *dev    = lfsck->li_next;
        struct thandle                  *th     = NULL;
        int                              rc     = 0;
        __u16                            type   = lnr->lnr_type;
@@ -4744,16 +4924,30 @@ int lfsck_namespace_repair_dangling(const struct lu_env *env,
        if (!create || bk->lb_param & LPF_DRYRUN)
                GOTO(log, rc = 0);
 
+       /* We may need to create the sub-objects of the @child via LOD,
+        * so make the modification based on lfsck->li_next. */
+
+       parent = lfsck_object_locate(dev, parent);
+       if (IS_ERR(parent))
+               GOTO(log, rc = PTR_ERR(parent));
+
+       if (unlikely(!dt_try_as_dir(env, parent)))
+               GOTO(log, rc = -ENOTDIR);
+
+       child = lfsck_object_locate(dev, child);
+       if (IS_ERR(child))
+               GOTO(log, rc = PTR_ERR(child));
+
        rc = linkea_data_new(&ldata, &info->lti_linkea_buf2);
        if (rc != 0)
                GOTO(log, rc);
 
-       rc = linkea_add_buf(&ldata, cname, lfsck_dto2fid(parent));
+       rc = linkea_add_buf(&ldata, cname, pfid);
        if (rc != 0)
                GOTO(log, rc);
 
-       rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
-                             MDS_INODELOCK_UPDATE, LCK_EX);
+       rc = lfsck_lock(env, lfsck, parent, lnr->lnr_name, llh,
+                       MDS_INODELOCK_UPDATE, LCK_PR);
        if (rc != 0)
                GOTO(log, rc);
 
@@ -4761,10 +4955,6 @@ int lfsck_namespace_repair_dangling(const struct lu_env *env,
        if (rc != 0)
                GOTO(log, rc);
 
-       th = dt_trans_create(env, dev);
-       if (IS_ERR(th))
-               GOTO(log, rc = PTR_ERR(th));
-
        /* Set the ctime as zero, then others can know it is created for
         * repairing dangling name entry by LFSCK. And if the LFSCK made
         * wrong decision and the real MDT-object has been found later,
@@ -4775,7 +4965,7 @@ int lfsck_namespace_repair_dangling(const struct lu_env *env,
                        LA_ATIME | LA_MTIME | LA_CTIME;
 
        child->do_ops->do_ah_init(env, hint, parent, child,
-                                 la->la_mode & S_IFMT);
+                                la->la_mode & S_IFMT);
 
        memset(dof, 0, sizeof(*dof));
        dof->dof_type = dt_mode_to_dft(type);
@@ -4783,6 +4973,10 @@ int lfsck_namespace_repair_dangling(const struct lu_env *env,
         * the MDT-object without stripes (dof->dof_reg.striped = 0). related
         * OST-objects will be created when write open. */
 
+       th = dt_trans_create(env, dev);
+       if (IS_ERR(th))
+               GOTO(log, rc = PTR_ERR(th));
+
        /* 1a. create child. */
        rc = dt_declare_create(env, child, la, hint, dof, th);
        if (rc != 0)
@@ -4792,35 +4986,35 @@ int lfsck_namespace_repair_dangling(const struct lu_env *env,
                if (unlikely(!dt_try_as_dir(env, child)))
                        GOTO(stop, rc = -ENOTDIR);
 
-               /* 2a. insert dot into child dir */
+               /* 2a. increase child nlink */
+               rc = dt_declare_ref_add(env, child, th);
+               if (rc != 0)
+                       GOTO(stop, rc);
+
+               /* 3a. insert dot into child dir */
                rec->rec_type = S_IFDIR;
-               rec->rec_fid = lfsck_dto2fid(child);
+               rec->rec_fid = cfid;
                rc = dt_declare_insert(env, child,
                                       (const struct dt_rec *)rec,
                                       (const struct dt_key *)dot, th);
                if (rc != 0)
                        GOTO(stop, rc);
 
-               /* 3a. insert dotdot into child dir */
-               rec->rec_fid = lfsck_dto2fid(parent);
+               /* 4a. insert dotdot into child dir */
+               rec->rec_fid = pfid;
                rc = dt_declare_insert(env, child,
                                       (const struct dt_rec *)rec,
                                       (const struct dt_key *)dotdot, th);
                if (rc != 0)
                        GOTO(stop, rc);
 
-               /* 4a. increase child nlink */
-               rc = dt_declare_ref_add(env, child, th);
-               if (rc != 0)
-                       GOTO(stop, rc);
-
                /* 5a. generate slave LMV EA. */
                if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
                        int idx;
 
                        idx = lfsck_shard_name_to_index(env,
                                        lnr->lnr_name, lnr->lnr_namelen,
-                                       type, lfsck_dto2fid(child));
+                                       type, cfid);
                        if (unlikely(idx < 0))
                                GOTO(stop, rc = idx);
 
@@ -4845,7 +5039,7 @@ int lfsck_namespace_repair_dangling(const struct lu_env *env,
        if (rc != 0)
                GOTO(stop, rc);
 
-       rc = dt_trans_start(env, dev, th);
+       rc = dt_trans_start_local(env, dev, th);
        if (rc != 0)
                GOTO(stop, rc = (rc == -EEXIST ? 1 : rc));
 
@@ -4856,34 +5050,30 @@ int lfsck_namespace_repair_dangling(const struct lu_env *env,
                GOTO(unlock, rc = (rc == -EEXIST ? 1 : rc));
 
        if (S_ISDIR(type)) {
-               if (unlikely(!dt_try_as_dir(env, child)))
-                       GOTO(unlock, rc = -ENOTDIR);
-
-               /* 2b. insert dot into child dir */
-               rec->rec_type = S_IFDIR;
-               rec->rec_fid = lfsck_dto2fid(child);
-               rc = dt_insert(env, child, (const struct dt_rec *)rec,
-                              (const struct dt_key *)dot, th, BYPASS_CAPA, 1);
+               /* 2b. increase child nlink */
+               rc = dt_ref_add(env, child, th);
                if (rc != 0)
                        GOTO(unlock, rc);
 
-               /* 3b. insert dotdot into child dir */
-               rec->rec_fid = lfsck_dto2fid(parent);
+               /* 3b. insert dot into child dir */
+               rec->rec_type = S_IFDIR;
+               rec->rec_fid = cfid;
                rc = dt_insert(env, child, (const struct dt_rec *)rec,
-                              (const struct dt_key *)dotdot, th,
-                              BYPASS_CAPA, 1);
+                              (const struct dt_key *)dot, th, 1);
                if (rc != 0)
                        GOTO(unlock, rc);
 
-               /* 4b. increase child nlink */
-               rc = dt_ref_add(env, child, th);
+               /* 4b. insert dotdot into child dir */
+               rec->rec_fid = pfid;
+               rc = dt_insert(env, child, (const struct dt_rec *)rec,
+                              (const struct dt_key *)dotdot, th, 1);
                if (rc != 0)
                        GOTO(unlock, rc);
 
                /* 5b. generate slave LMV EA. */
                if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
                        rc = dt_xattr_set(env, child, &lmv_buf, XATTR_NAME_LMV,
-                                         0, th, BYPASS_CAPA);
+                                         0, th);
                        if (rc != 0)
                                GOTO(unlock, rc);
                }
@@ -4891,7 +5081,7 @@ int lfsck_namespace_repair_dangling(const struct lu_env *env,
 
        /* 6b. insert linkEA for child. */
        rc = dt_xattr_set(env, child, &linkea_buf,
-                         XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
+                         XATTR_NAME_LINK, 0, th);
 
        GOTO(unlock, rc);
 
@@ -4902,13 +5092,12 @@ stop:
        dt_trans_stop(env, dev, th);
 
 log:
-       lfsck_ibits_unlock(&lh, LCK_EX);
+       lfsck_unlock(llh);
        CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found dangling "
               "reference for: parent "DFID", child "DFID", type %u, "
               "name %s. %s: rc = %d\n", lfsck_lfsck2name(lfsck),
-              PFID(lfsck_dto2fid(parent)), PFID(lfsck_dto2fid(child)),
-              type, cname->ln_name,
-              create ? "Create the lost OST-object as required" :
+              PFID(pfid), PFID(cfid), type, cname->ln_name,
+              create ? "Create the lost MDT-object as required" :
                        "Keep the MDT-object there by default", rc);
 
        if (rc <= 0) {
@@ -4929,14 +5118,16 @@ static int lfsck_namespace_assistant_handler_p1(const struct lu_env *env,
        struct lfsck_instance      *lfsck    = com->lc_lfsck;
        struct lfsck_bookmark      *bk       = &lfsck->li_bookmark_ram;
        struct lfsck_namespace     *ns       = com->lc_file_ram;
+       struct lfsck_assistant_data *lad     = com->lc_data;
        struct linkea_data          ldata    = { NULL };
        const struct lu_name       *cname;
        struct thandle             *handle   = NULL;
        struct lfsck_namespace_req *lnr      =
                        container_of0(lar, struct lfsck_namespace_req, lnr_lar);
-       struct dt_object           *dir      = lnr->lnr_obj;
+       struct dt_object           *dir      = NULL;
        struct dt_object           *obj      = NULL;
-       const struct lu_fid        *pfid     = lfsck_dto2fid(dir);
+       struct lfsck_assistant_object *lso   = lar->lar_parent;
+       const struct lu_fid        *pfid     = &lso->lso_fid;
        struct dt_device           *dev      = NULL;
        struct lustre_handle        lh       = { 0 };
        bool                        repaired = false;
@@ -4945,12 +5136,16 @@ static int lfsck_namespace_assistant_handler_p1(const struct lu_env *env,
        bool                        newdata;
        bool                        log      = false;
        bool                        bad_hash = false;
+       bool                        bad_linkea = false;
        int                         idx      = 0;
        int                         count    = 0;
-       int                         rc;
+       int                         rc       = 0;
        enum lfsck_namespace_inconsistency_type type = LNIT_NONE;
        ENTRY;
 
+       if (lso->lso_dead)
+               RETURN(0);
+
        la->la_nlink = 0;
        if (lnr->lnr_attr & LUDA_UPGRADE) {
                ns->ln_flags |= LF_UPGRADE;
@@ -4972,14 +5167,31 @@ static int lfsck_namespace_assistant_handler_p1(const struct lu_env *env,
                GOTO(out, rc);
        }
 
+       if (unlikely(!fid_is_sane(&lnr->lnr_fid))) {
+               CDEBUG(D_LFSCK, "%s: dir scan find invalid FID "DFID
+                      " for the name entry %.*s under "DFID"\n",
+                      lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid),
+                      lnr->lnr_namelen, lnr->lnr_name, PFID(pfid));
+
+               if (strcmp(lnr->lnr_name, dotdot) != 0)
+                       /* invalid FID means bad name entry, remove it. */
+                       type = LNIT_BAD_DIRENT;
+               else
+                       /* If the parent FID is invalid, we cannot remove
+                        * the ".." entry directly. */
+                       rc = lfsck_namespace_trace_update(env, com, pfid,
+                                               LNTF_CHECK_PARENT, true);
+
+               GOTO(out, rc);
+       }
+
        if (unlikely(lnr->lnr_dir_cookie == MDS_DIR_END_OFF)) {
                rc = lfsck_namespace_striped_dir_rescan(env, com, lnr);
 
                RETURN(rc);
        }
 
-       if (lnr->lnr_name[0] == '.' &&
-           (lnr->lnr_namelen == 1 || fid_seq_is_dot(fid_seq(&lnr->lnr_fid))))
+       if (fid_seq_is_dot(fid_seq(&lnr->lnr_fid)))
                GOTO(out, rc = 0);
 
        if (lnr->lnr_lmv != NULL && lnr->lnr_lmv->ll_lmv_master) {
@@ -4992,11 +5204,11 @@ static int lfsck_namespace_assistant_handler_p1(const struct lu_env *env,
        if (idx < 0)
                GOTO(out, rc = idx);
 
-       if (idx == lfsck_dev_idx(lfsck->li_bottom)) {
+       if (idx == lfsck_dev_idx(lfsck)) {
                if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0))
                        GOTO(out, rc = 0);
 
-               dev = lfsck->li_next;
+               dev = lfsck->li_bottom;
        } else {
                struct lfsck_tgt_desc *ltd;
 
@@ -5010,7 +5222,7 @@ static int lfsck_namespace_assistant_handler_p1(const struct lu_env *env,
                        GOTO(out, rc);
                }
 
-               ltd = LTD_TGT(&lfsck->li_mdt_descs, idx);
+               ltd = lfsck_ltd2tgt(&lfsck->li_mdt_descs, idx);
                if (unlikely(ltd == NULL)) {
                        CDEBUG(D_LFSCK, "%s: cannot talk with MDT %x which "
                               "did not join the namespace LFSCK\n",
@@ -5031,6 +5243,15 @@ static int lfsck_namespace_assistant_handler_p1(const struct lu_env *env,
        if (dt_object_exists(obj) == 0) {
 
 dangling:
+               if (dir == NULL) {
+                       dir = lfsck_assistant_object_load(env, lfsck, lso);
+                       if (IS_ERR(dir)) {
+                               rc = PTR_ERR(dir);
+
+                               GOTO(trace, rc == -ENOENT ? 0 : rc);
+                       }
+               }
+
                rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
                if (rc == 0) {
                        if (!lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
@@ -5041,7 +5262,7 @@ dangling:
                        }
 
                        type = LNIT_DANGLING;
-                       rc = lfsck_namespace_repair_dangling(env, com,
+                       rc = lfsck_namespace_repair_dangling(env, com, dir,
                                                             obj, lnr);
                        if (rc == 0)
                                repaired = true;
@@ -5050,7 +5271,7 @@ dangling:
                GOTO(out, rc);
        }
 
-       if (!(bk->lb_param & LPF_DRYRUN) && repaired) {
+       if (!(bk->lb_param & LPF_DRYRUN) && lad->lad_advance_lock) {
 
 again:
                rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
@@ -5067,7 +5288,7 @@ again:
                if (rc != 0)
                        GOTO(stop, rc);
 
-               rc = dt_trans_start(env, dev, handle);
+               rc = dt_trans_start_local(env, dev, handle);
                if (rc != 0)
                        GOTO(stop, rc);
 
@@ -5075,10 +5296,6 @@ again:
                dtlocked = true;
        }
 
-       rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
-       if (rc != 0)
-               GOTO(stop, rc);
-
        rc = lfsck_links_read(env, obj, &ldata);
        if (unlikely(rc == -ENOENT)) {
                if (handle != NULL) {
@@ -5108,13 +5325,12 @@ again:
                        goto stop;
                }
 
-               ns->ln_flags |= LF_INCONSISTENT;
-
                /* If the name entry hash does not match the slave striped
                 * directory, and the name entry does not match also, then
                 * it is quite possible that name entry is corrupted. */
                if (!lfsck_is_valid_slave_name_entry(env, lnr->lnr_lmv,
                                        lnr->lnr_name, lnr->lnr_namelen)) {
+                       ns->ln_flags |= LF_INCONSISTENT;
                        type = LNIT_BAD_DIRENT;
 
                        GOTO(stop, rc = 0);
@@ -5125,6 +5341,7 @@ again:
                 * not recognize the name entry, then it is quite possible
                 * that the name entry is corrupted. */
                if ((lfsck_object_type(obj) & S_IFMT) != lnr->lnr_type) {
+                       ns->ln_flags |= LF_INCONSISTENT;
                        type = LNIT_BAD_DIRENT;
 
                        GOTO(stop, rc = 0);
@@ -5147,7 +5364,6 @@ again:
                        type = LNIT_BAD_TYPE;
 
                count = 1;
-               ns->ln_flags |= LF_INCONSISTENT;
                /* The magic crashed, we are not sure whether there are more
                 * corrupt data in the linkea, so remove all linkea entries. */
                remove = true;
@@ -5158,27 +5374,53 @@ again:
                        type = LNIT_BAD_TYPE;
 
                count = 1;
-               ns->ln_flags |= LF_UPGRADE;
                remove = false;
                newdata = true;
 
 nodata:
                if (bk->lb_param & LPF_DRYRUN) {
+                       if (rc == -ENODATA)
+                               ns->ln_flags |= LF_UPGRADE;
+                       else
+                               ns->ln_flags |= LF_INCONSISTENT;
                        ns->ln_linkea_repaired++;
                        repaired = true;
                        log = true;
                        goto stop;
                }
 
-               if (!lustre_handle_is_used(&lh))
+               if (!lustre_handle_is_used(&lh)) {
+                       remove = false;
+                       newdata = false;
+                       type = LNIT_NONE;
+
                        goto again;
+               }
+
+               if (dir == NULL) {
+                       dir = lfsck_assistant_object_load(env, lfsck, lso);
+                       if (IS_ERR(dir)) {
+                               rc = PTR_ERR(dir);
+
+                               GOTO(stop, rc == -ENOENT ? 0 : rc);
+                       }
+               }
+
+               rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
+               if (rc != 0)
+                       GOTO(stop, rc);
+
+               bad_linkea = true;
+               if (!remove && newdata)
+                       ns->ln_flags |= LF_UPGRADE;
+               else if (remove || !(ns->ln_flags & LF_UPGRADE))
+                       ns->ln_flags |= LF_INCONSISTENT;
 
                if (remove) {
                        LASSERT(newdata);
 
-                       rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, handle,
-                                         BYPASS_CAPA);
-                       if (rc != 0)
+                       rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, handle);
+                       if (rc != 0 && rc != -ENOENT && rc != -ENODATA)
                                GOTO(stop, rc);
                }
 
@@ -5252,13 +5494,31 @@ out:
                ns->ln_flags |= LF_INCONSISTENT;
 
                log = false;
+               if (dir == NULL) {
+                       dir = lfsck_assistant_object_load(env, lfsck, lso);
+                       if (IS_ERR(dir)) {
+                               rc = PTR_ERR(dir);
+
+                               GOTO(trace, rc == -ENOENT ? 0 : rc);
+                       }
+               }
+
                rc = lfsck_namespace_repair_bad_name_hash(env, com, dir,
                                                lnr->lnr_lmv, lnr->lnr_name);
-               if (rc >= 0)
+               if (rc == 0)
                        bad_hash = true;
        }
 
        if (rc >= 0) {
+               if (type != LNIT_NONE && dir == NULL) {
+                       dir = lfsck_assistant_object_load(env, lfsck, lso);
+                       if (IS_ERR(dir)) {
+                               rc = PTR_ERR(dir);
+
+                               GOTO(trace, rc == -ENOENT ? 0 : rc);
+                       }
+               }
+
                switch (type) {
                case LNIT_BAD_TYPE:
                        log = false;
@@ -5284,38 +5544,37 @@ out:
                        break;
                }
 
-               if (count == 1 && S_ISREG(lfsck_object_type(obj)))
-                       dt_attr_get(env, obj, la, BYPASS_CAPA);
+               if (obj != NULL && count == 1 &&
+                   S_ISREG(lfsck_object_type(obj)))
+                       dt_attr_get(env, obj, la);
        }
 
+trace:
        down_write(&com->lc_sem);
        if (rc < 0) {
                CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail to handle "
                       "the entry: "DFID", parent "DFID", name %.*s: rc = %d\n",
-                      lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid),
-                      PFID(lfsck_dto2fid(lnr->lnr_obj)),
+                      lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid), PFID(pfid),
                       lnr->lnr_namelen, lnr->lnr_name, rc);
 
                lfsck_namespace_record_failure(env, lfsck, ns);
                if ((rc == -ENOTCONN || rc == -ESHUTDOWN || rc == -EREMCHG ||
                     rc == -ETIMEDOUT || rc == -EHOSTDOWN ||
                     rc == -EHOSTUNREACH || rc == -EINPROGRESS) &&
-                   dev != NULL && dev != lfsck->li_next)
+                   dev != NULL && dev != lfsck->li_bottom)
                        lfsck_lad_set_bitmap(env, com, idx);
 
                if (!(bk->lb_param & LPF_FAILOUT))
                        rc = 0;
        } else {
-               if (log)
-                       CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant "
-                              "repaired the entry: "DFID", parent "DFID
-                              ", name %.*s\n", lfsck_lfsck2name(lfsck),
-                              PFID(&lnr->lnr_fid),
-                              PFID(lfsck_dto2fid(lnr->lnr_obj)),
-                              lnr->lnr_namelen, lnr->lnr_name);
-
                if (repaired) {
                        ns->ln_items_repaired++;
+                       if (log)
+                               CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant "
+                                      "repaired the entry: "DFID", parent "DFID
+                                      ", name %.*s\n", lfsck_lfsck2name(lfsck),
+                                      PFID(&lnr->lnr_fid), PFID(pfid),
+                                      lnr->lnr_namelen, lnr->lnr_name);
 
                        switch (type) {
                        case LNIT_DANGLING:
@@ -5342,8 +5601,17 @@ out:
                        ns->ln_name_hash_repaired++;
 
                        /* Not count repeatedly. */
-                       if (!repaired)
+                       if (!repaired) {
                                ns->ln_items_repaired++;
+                               if (log)
+                                       CDEBUG(D_LFSCK, "%s: namespace LFSCK "
+                                              "assistant repaired the entry: "
+                                              DFID", parent "DFID
+                                              ", name %.*s\n",
+                                              lfsck_lfsck2name(lfsck),
+                                              PFID(&lnr->lnr_fid), PFID(pfid),
+                                              lnr->lnr_namelen, lnr->lnr_name);
+                       }
 
                        if (bk->lb_param & LPF_DRYRUN &&
                            lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
@@ -5363,6 +5631,11 @@ out:
        if (obj != NULL && !IS_ERR(obj))
                lfsck_object_put(env, obj);
 
+       if (dir != NULL && !IS_ERR(dir))
+               lfsck_object_put(env, dir);
+
+       lad->lad_advance_lock = bad_linkea;
+
        return rc;
 }
 
@@ -5423,7 +5696,7 @@ static int lfsck_namespace_scan_local_lpf_one(const struct lu_env *env,
        obj = com->lc_sub_trace_objs[idx].lsto_obj;
        fid_cpu_to_be(key, &ent->lde_fid);
        rc = dt_lookup(env, obj, (struct dt_rec *)&flags,
-                      (const struct dt_key *)key, BYPASS_CAPA);
+                      (const struct dt_key *)key);
        if (rc == 0) {
                exist = true;
                flags |= LNTF_CHECK_ORPHAN;
@@ -5477,8 +5750,7 @@ static int lfsck_namespace_scan_local_lpf_one(const struct lu_env *env,
                GOTO(stop, rc);
 
        /* b1. remove name entry from backend /lost+found */
-       rc = dt_delete(env, parent, (const struct dt_key *)ent->lde_name, th,
-                      BYPASS_CAPA);
+       rc = dt_delete(env, parent, (const struct dt_key *)ent->lde_name, th);
        if (rc != 0)
                GOTO(stop, rc);
 
@@ -5493,20 +5765,19 @@ static int lfsck_namespace_scan_local_lpf_one(const struct lu_env *env,
 
        if (exist) {
                /* a3. remove child's FID from the LFSCK trace file. */
-               rc = dt_delete(env, obj, (const struct dt_key *)key, th,
-                              BYPASS_CAPA);
+               rc = dt_delete(env, obj, (const struct dt_key *)key, th);
                if (rc != 0)
                        GOTO(stop, rc);
        } else {
                /* b4. set child's ctime as 1 */
-               rc = dt_attr_set(env, child, la, th, BYPASS_CAPA);
+               rc = dt_attr_set(env, child, la, th);
                if (rc != 0)
                        GOTO(stop, rc);
        }
 
        /* b5. insert child's FID into the LFSCK trace file. */
        rc = dt_insert(env, obj, (const struct dt_rec *)&flags,
-                      (const struct dt_key *)key, th, BYPASS_CAPA, 1);
+                      (const struct dt_key *)key, th, 1);
 
        GOTO(stop, rc = (rc == 0 ? 1 : rc));
 
@@ -5514,7 +5785,7 @@ stop:
        dt_trans_stop(env, dev, th);
 
 out:
-       lu_object_put(env, &child->do_lu);
+       lfsck_object_put(env, child);
 
        return rc;
 }
@@ -5544,19 +5815,19 @@ static void lfsck_namespace_scan_local_lpf(const struct lu_env *env,
        struct lfsck_instance           *lfsck  = com->lc_lfsck;
        struct ptlrpc_thread            *thread = &lfsck->li_thread;
        struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
-       struct dt_device                *dev    = lfsck->li_bottom;
        struct lfsck_namespace          *ns     = com->lc_file_ram;
        struct dt_object                *parent;
        const struct dt_it_ops          *iops;
        struct dt_it                    *di;
-       struct seq_server_site          *ss     =
-                                       lu_site2seq(dev->dd_lu_dev.ld_site);
+       struct seq_server_site          *ss     = lfsck_dev_site(lfsck);
        __u64                            cookie;
+       __u32                            idx    = lfsck_dev_idx(lfsck);
        int                              rc     = 0;
        __u16                            type;
        ENTRY;
 
-       parent = lfsck_object_find_by_dev(env, dev, &LU_BACKEND_LPF_FID);
+       parent = lfsck_object_find_by_dev(env, lfsck->li_bottom,
+                                         &LU_BACKEND_LPF_FID);
        if (IS_ERR(parent)) {
                CERROR("%s: fail to find backend /lost+found: rc = %ld\n",
                       lfsck_lfsck2name(lfsck), PTR_ERR(parent));
@@ -5575,7 +5846,7 @@ static void lfsck_namespace_scan_local_lpf(const struct lu_env *env,
 
        com->lc_new_scanned = 0;
        iops = &parent->do_index_ops->dio_it;
-       di = iops->init(env, parent, LUDA_64BITHASH | LUDA_TYPE, BYPASS_CAPA);
+       di = iops->init(env, parent, LUDA_64BITHASH | LUDA_TYPE);
        if (IS_ERR(di))
                GOTO(out, rc = PTR_ERR(di));
 
@@ -5616,7 +5887,7 @@ static void lfsck_namespace_scan_local_lpf(const struct lu_env *env,
                                              fid_seq(&ent->lde_fid), range);
                        if (rc != 0)
                                goto skip;
-               } else if (lfsck_dev_idx(dev) != 0) {
+               } else if (idx != 0) {
                        /* If the returned FID is IGIF, then there are three
                         * possible cases:
                         *
@@ -5641,8 +5912,7 @@ static void lfsck_namespace_scan_local_lpf(const struct lu_env *env,
                               "in the backend /lost+found on the MDT %04x, "
                               "to be safe, skip it.\n",
                               lfsck_lfsck2name(lfsck), ent->lde_namelen,
-                              ent->lde_name, PFID(&ent->lde_fid),
-                              lfsck_dev_idx(dev));
+                              ent->lde_name, PFID(&ent->lde_fid), idx);
                        goto skip;
                }
 
@@ -5682,7 +5952,7 @@ out:
        CDEBUG(D_LFSCK, "%s: stop to scan backend /lost+found: rc = %d\n",
               lfsck_lfsck2name(lfsck), rc);
 
-       lu_object_put(env, &parent->do_lu);
+       lfsck_object_put(env, parent);
 }
 
 /**
@@ -5719,6 +5989,7 @@ static int lfsck_namespace_rescan_striped_dir(const struct lu_env *env,
                        (struct lu_dirent *)info->lti_key;
        struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
        struct ptlrpc_thread            *thread = &lfsck->li_thread;
+       struct lfsck_assistant_object   *lso    = NULL;
        struct lfsck_namespace_req      *lnr;
        struct lfsck_assistant_req      *lar;
        int                              rc;
@@ -5753,7 +6024,20 @@ static int lfsck_namespace_rescan_striped_dir(const struct lu_env *env,
                if (name_is_dot_or_dotdot(ent->lde_name, ent->lde_namelen))
                        goto next;
 
-               lnr = lfsck_namespace_assistant_req_init(lfsck, ent, type);
+               if (lso == NULL) {
+                       lso = lfsck_assistant_object_init(env,
+                               lfsck_dto2fid(dir), NULL,
+                               lfsck->li_pos_current.lp_oit_cookie, true);
+                       if (IS_ERR(lso)) {
+                               if (bk->lb_param & LPF_FAILOUT)
+                                       GOTO(out, rc = PTR_ERR(lso));
+
+                               lso = NULL;
+                               goto next;
+                       }
+               }
+
+               lnr = lfsck_namespace_assistant_req_init(lfsck, lso, ent, type);
                if (IS_ERR(lnr)) {
                        if (bk->lb_param & LPF_FAILOUT)
                                GOTO(out, rc = PTR_ERR(lnr));
@@ -5775,6 +6059,9 @@ next:
        } while (rc == 0);
 
 out:
+       if (lso != NULL && !IS_ERR(lso))
+               lfsck_assistant_object_put(env, lso);
+
        lfsck_close_dir(env, lfsck, rc);
        if (rc <= 0)
                RETURN(rc);
@@ -5813,7 +6100,7 @@ lfsck_namespace_double_scan_one_trace_file(const struct lu_env *env,
        __u8                     flags  = 0;
        ENTRY;
 
-       di = iops->init(env, obj, 0, BYPASS_CAPA);
+       di = iops->init(env, obj, 0);
        if (IS_ERR(di))
                RETURN(PTR_ERR(di));
 
@@ -5853,7 +6140,7 @@ lfsck_namespace_double_scan_one_trace_file(const struct lu_env *env,
                        goto checkpoint;
                }
 
-               target = lfsck_object_find_by_dev(env, lfsck->li_bottom, &fid);
+               target = lfsck_object_find_bottom(env, lfsck, &fid);
                if (IS_ERR(target)) {
                        rc = PTR_ERR(target);
                        goto checkpoint;
@@ -5896,7 +6183,7 @@ checkpoint:
                        ns->ln_time_last_checkpoint = cfs_time_current_sec();
                        ns->ln_objs_checked_phase2 += com->lc_new_checked;
                        com->lc_new_checked = 0;
-                       rc = lfsck_namespace_store(env, com, false);
+                       rc = lfsck_namespace_store(env, com);
                        up_write(&com->lc_sem);
                        if (rc != 0)
                                GOTO(put, rc);
@@ -5985,9 +6272,9 @@ static void lfsck_namespace_assistant_fill_pos(const struct lu_env *env,
        lnr = list_entry(lad->lad_req_list.next,
                         struct lfsck_namespace_req,
                         lnr_lar.lar_list);
-       pos->lp_oit_cookie = lnr->lnr_oit_cookie;
+       pos->lp_oit_cookie = lnr->lnr_lar.lar_parent->lso_oit_cookie;
        pos->lp_dir_cookie = lnr->lnr_dir_cookie - 1;
-       pos->lp_dir_parent = *lfsck_dto2fid(lnr->lnr_obj);
+       pos->lp_dir_parent = lnr->lnr_lar.lar_parent->lso_fid;
 }
 
 static int lfsck_namespace_double_scan_result(const struct lu_env *env,
@@ -5999,7 +6286,7 @@ static int lfsck_namespace_double_scan_result(const struct lu_env *env,
 
        down_write(&com->lc_sem);
        ns->ln_run_time_phase2 += cfs_duration_sec(cfs_time_current() +
-                               HALF_SEC - lfsck->li_time_last_checkpoint);
+                                 HALF_SEC - com->lc_time_last_checkpoint);
        ns->ln_time_last_checkpoint = cfs_time_current_sec();
        ns->ln_objs_checked_phase2 += com->lc_new_checked;
        com->lc_new_checked = 0;
@@ -6022,7 +6309,7 @@ static int lfsck_namespace_double_scan_result(const struct lu_env *env,
                ns->ln_status = LS_FAILED;
        }
 
-       rc = lfsck_namespace_store(env, com, false);
+       rc = lfsck_namespace_store(env, com);
        up_write(&com->lc_sem);
 
        return rc;
@@ -6033,6 +6320,13 @@ lfsck_namespace_assistant_sync_failures_interpret(const struct lu_env *env,
                                                  struct ptlrpc_request *req,
                                                  void *args, int rc)
 {
+       if (rc == 0) {
+               struct lfsck_async_interpret_args *laia = args;
+               struct lfsck_tgt_desc             *ltd  = laia->laia_ltd;
+
+               ltd->ltd_synced_failures = 1;
+       }
+
        return 0;
 }
 
@@ -6069,9 +6363,13 @@ static void lfsck_namespace_assistant_sync_failures(const struct lu_env *env,
        struct lfsck_tgt_descs            *ltds  = &lfsck->li_mdt_descs;
        struct lfsck_tgt_desc             *ltd;
        struct ptlrpc_request_set         *set;
+       __u32                              idx;
        int                                rc    = 0;
        ENTRY;
 
+       if (!lad->lad_incomplete)
+               RETURN_EXIT;
+
        set = ptlrpc_prep_set();
        if (set == NULL)
                GOTO(out, rc = -ENOMEM);
@@ -6080,25 +6378,12 @@ static void lfsck_namespace_assistant_sync_failures(const struct lu_env *env,
        memset(laia, 0, sizeof(*laia));
        lad->lad_touch_gen++;
 
-       spin_lock(&ltds->ltd_lock);
-       while (!list_empty(&lad->lad_mdt_list)) {
-               ltd = list_entry(lad->lad_mdt_list.next,
-                                struct lfsck_tgt_desc,
-                                ltd_namespace_list);
-               if (ltd->ltd_namespace_gen == lad->lad_touch_gen)
-                       break;
-
-               ltd->ltd_namespace_gen = lad->lad_touch_gen;
-               list_move_tail(&ltd->ltd_namespace_list,
-                              &lad->lad_mdt_list);
-               if (!lad->lad_incomplete ||
-                   !cfs_bitmap_check(lad->lad_bitmap, ltd->ltd_index)) {
-                       ltd->ltd_namespace_failed = 0;
-                       continue;
-               }
+       down_read(&ltds->ltd_rw_sem);
+       cfs_foreach_bit(lad->lad_bitmap, idx) {
+               ltd = lfsck_ltd2tgt(ltds, idx);
+               LASSERT(ltd != NULL);
 
-               ltd->ltd_namespace_failed = 1;
-               spin_unlock(&ltds->ltd_lock);
+               laia->laia_ltd = ltd;
                rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
                        lfsck_namespace_assistant_sync_failures_interpret,
                        laia, LFSCK_NOTIFY);
@@ -6106,10 +6391,8 @@ static void lfsck_namespace_assistant_sync_failures(const struct lu_env *env,
                        CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail "
                               "to sync failure with MDT %x: rc = %d\n",
                               lfsck_lfsck2name(lfsck), ltd->ltd_index, rc);
-
-               spin_lock(&ltds->ltd_lock);
        }
-       spin_unlock(&ltds->ltd_lock);
+       up_read(&ltds->ltd_rw_sem);
 
        rc = ptlrpc_set_wait(set);
        ptlrpc_set_destroy(set);
@@ -6141,7 +6424,6 @@ struct lfsck_assistant_operations lfsck_namespace_assistant_ops = {
  * entries, then re-generate the linkEA with the given information.
  *
  * \param[in] env      pointer to the thread context
- * \param[in] dev      pointer to the dt_device
  * \param[in] obj      pointer to the dt_object to be handled
  * \param[in] cname    the name for the child in the parent directory
  * \param[in] pfid     the parent directory's FID for the linkEA
@@ -6149,10 +6431,10 @@ struct lfsck_assistant_operations lfsck_namespace_assistant_ops = {
  * \retval             0 for success
  * \retval             negative error number on failure
  */
-int lfsck_verify_linkea(const struct lu_env *env, struct dt_device *dev,
-                       struct dt_object *obj, const struct lu_name *cname,
-                       const struct lu_fid *pfid)
+int lfsck_verify_linkea(const struct lu_env *env, struct dt_object *obj,
+                       const struct lu_name *cname, const struct lu_fid *pfid)
 {
+       struct dt_device        *dev    = lfsck_obj2dev(obj);
        struct linkea_data       ldata  = { NULL };
        struct lu_buf            linkea_buf;
        struct thandle          *th;
@@ -6205,7 +6487,7 @@ int lfsck_verify_linkea(const struct lu_env *env, struct dt_device *dev,
 
        dt_write_lock(env, obj, 0);
        rc = dt_xattr_set(env, obj, &linkea_buf,
-                         XATTR_NAME_LINK, fl, th, BYPASS_CAPA);
+                         XATTR_NAME_LINK, fl, th);
        dt_write_unlock(env, obj);
 
        GOTO(stop, rc);
@@ -6256,10 +6538,10 @@ int lfsck_links_get_first(const struct lu_env *env, struct dt_object *obj,
  *
  * \param[in] env      pointer to the thread context
  * \param[in] lfsck    pointer to the lfsck instance
- * \param[in] parent   pointer to the parent directory that holds
+ * \param[in] dir      pointer to the directory that holds
  *                     the name entry
  * \param[in] name     the name for the entry to be updated
- * \param[in] pfid     the new PFID for the name entry
+ * \param[in] fid      the new FID for the name entry referenced
  * \param[in] type     the type for the name entry to be updated
  *
  * \retval             0 for success
@@ -6267,19 +6549,20 @@ int lfsck_links_get_first(const struct lu_env *env, struct dt_object *obj,
  */
 int lfsck_update_name_entry(const struct lu_env *env,
                            struct lfsck_instance *lfsck,
-                           struct dt_object *parent, const char *name,
-                           const struct lu_fid *pfid, __u32 type)
+                           struct dt_object *dir, const char *name,
+                           const struct lu_fid *fid, __u32 type)
 {
-       struct dt_insert_rec    *rec    = &lfsck_env_info(env)->lti_dt_rec;
-       struct dt_device        *dev    = lfsck->li_next;
-       struct lustre_handle     lh     = { 0 };
-       struct thandle          *th;
-       int                      rc;
-       bool                     exists = true;
+       struct lfsck_thread_info *info   = lfsck_env_info(env);
+       struct dt_insert_rec     *rec    = &info->lti_dt_rec;
+       struct lfsck_lock_handle *llh    = &info->lti_llh;
+       struct dt_device         *dev    = lfsck_obj2dev(dir);
+       struct thandle           *th;
+       int                       rc;
+       bool                      exists = true;
        ENTRY;
 
-       rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
-                             MDS_INODELOCK_UPDATE, LCK_EX);
+       rc = lfsck_lock(env, lfsck, dir, name, llh,
+                       MDS_INODELOCK_UPDATE, LCK_PW);
        if (rc != 0)
                RETURN(rc);
 
@@ -6287,27 +6570,26 @@ int lfsck_update_name_entry(const struct lu_env *env,
        if (IS_ERR(th))
                GOTO(unlock, rc = PTR_ERR(th));
 
-       rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
+       rc = dt_declare_delete(env, dir, (const struct dt_key *)name, th);
        if (rc != 0)
                GOTO(stop, rc);
 
        rec->rec_type = type;
-       rec->rec_fid = pfid;
-       rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
+       rec->rec_fid = fid;
+       rc = dt_declare_insert(env, dir, (const struct dt_rec *)rec,
                               (const struct dt_key *)name, th);
        if (rc != 0)
                GOTO(stop, rc);
 
-       rc = dt_declare_ref_add(env, parent, th);
+       rc = dt_declare_ref_add(env, dir, th);
        if (rc != 0)
                GOTO(stop, rc);
 
-       rc = dt_trans_start(env, dev, th);
+       rc = dt_trans_start_local(env, dev, th);
        if (rc != 0)
                GOTO(stop, rc);
 
-       rc = dt_delete(env, parent, (const struct dt_key *)name, th,
-                      BYPASS_CAPA);
+       rc = dt_delete(env, dir, (const struct dt_key *)name, th);
        if (rc == -ENOENT) {
                exists = false;
                rc = 0;
@@ -6316,12 +6598,12 @@ int lfsck_update_name_entry(const struct lu_env *env,
        if (rc != 0)
                GOTO(stop, rc);
 
-       rc = dt_insert(env, parent, (const struct dt_rec *)rec,
-                      (const struct dt_key *)name, th, BYPASS_CAPA, 1);
+       rc = dt_insert(env, dir, (const struct dt_rec *)rec,
+                      (const struct dt_key *)name, th, 1);
        if (rc == 0 && S_ISDIR(type) && !exists) {
-               dt_write_lock(env, parent, 0);
-               rc = dt_ref_add(env, parent, th);
-               dt_write_unlock(env, parent);
+               dt_write_lock(env, dir, 0);
+               rc = dt_ref_add(env, dir, th);
+               dt_write_unlock(env, dir);
        }
 
        GOTO(stop, rc);
@@ -6330,11 +6612,10 @@ stop:
        dt_trans_stop(env, dev, th);
 
 unlock:
-       lfsck_ibits_unlock(&lh, LCK_EX);
-
+       lfsck_unlock(llh);
        CDEBUG(D_LFSCK, "%s: update name entry "DFID"/%s with the FID "DFID
               " and the type %o: rc = %d\n", lfsck_lfsck2name(lfsck),
-              PFID(lfsck_dto2fid(parent)), name, PFID(pfid), type, rc);
+              PFID(lfsck_dto2fid(dir)), name, PFID(fid), type, rc);
 
        return rc;
 }
@@ -6388,9 +6669,10 @@ int lfsck_namespace_setup(const struct lu_env *env,
        if (unlikely(!dt_try_as_dir(env, root)))
                GOTO(out, rc = -ENOTDIR);
 
-       obj = local_file_find_or_create(env, lfsck->li_los, root,
-                                       LFSCK_NAMESPACE,
-                                       S_IFREG | S_IRUGO | S_IWUSR);
+       obj = local_index_find_or_create(env, lfsck->li_los, root,
+                                        LFSCK_NAMESPACE,
+                                        S_IFREG | S_IRUGO | S_IWUSR,
+                                        &dt_lfsck_features);
        if (IS_ERR(obj))
                GOTO(out, rc = PTR_ERR(obj));
 
@@ -6439,7 +6721,7 @@ int lfsck_namespace_setup(const struct lu_env *env,
 
 out:
        if (root != NULL && !IS_ERR(root))
-               lu_object_put(env, &root->do_lu);
+               lfsck_object_put(env, root);
        if (rc != 0) {
                lfsck_component_cleanup(env, com);
                CERROR("%s: fail to init namespace LFSCK component: rc = %d\n",