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LU-6316 lfsck: skip dot name entry
[fs/lustre-release.git] / lustre / lfsck / lfsck_namespace.c
index 529b5d1..bf8dd2f 100644 (file)
@@ -386,6 +386,7 @@ static int lfsck_namespace_store(const struct lu_env *env,
        struct lfsck_instance           *lfsck  = com->lc_lfsck;
        struct lfsck_namespace          *ns     = com->lc_file_ram;
        struct lfsck_assistant_data     *lad    = com->lc_data;
+       struct dt_device                *dev    = lfsck_obj2dev(obj);
        cfs_bitmap_t                    *bitmap = NULL;
        struct thandle                  *handle;
        __u32                            nbits  = 0;
@@ -407,7 +408,7 @@ 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));
 
@@ -439,7 +440,7 @@ static int lfsck_namespace_store(const struct lu_env *env,
        }
 #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);
 
@@ -462,7 +463,7 @@ static int lfsck_namespace_store(const struct lu_env *env,
        GOTO(out, rc);
 
 out:
-       dt_trans_stop(env, lfsck->li_bottom, handle);
+       dt_trans_stop(env, dev, handle);
 
 log:
        if (rc != 0)
@@ -475,9 +476,7 @@ 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;
@@ -489,12 +488,9 @@ 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;
 }
@@ -516,13 +512,12 @@ 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);
 
@@ -573,7 +568,7 @@ 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;
@@ -588,6 +583,7 @@ int lfsck_namespace_trace_update(const struct lu_env *env,
 
        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,
@@ -761,7 +757,7 @@ 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;
@@ -918,10 +914,10 @@ static int lfsck_namespace_insert_orphan(const struct lu_env *env,
        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 lu_buf                    linkea_buf;
@@ -938,12 +934,7 @@ 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++);
@@ -957,6 +948,29 @@ 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, BYPASS_CAPA);
+       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);
@@ -968,8 +982,8 @@ static int lfsck_namespace_insert_orphan(const struct lu_env *env,
                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);
 
@@ -1084,7 +1098,7 @@ 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),
@@ -1131,21 +1145,34 @@ 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. */
        struct dt_device                *dev    = lfsck->li_next;
+       struct dt_object                *pobj   = NULL;
+       struct dt_object                *cobj   = NULL;
        struct thandle                  *th     = NULL;
-       struct lustre_handle             lh     = { 0 };
+       struct lfsck_lock_handle        *llh    = &info->lti_llh;
        int                              rc     = 0;
        ENTRY;
 
-       if (unlikely(!dt_try_as_dir(env, parent)))
+       /* @parent/@child may be based on lfsck->li_bottom,
+        * but here we need the object based on the lfsck->li_next. */
+
+       pobj = lfsck_object_locate(dev, parent);
+       if (IS_ERR(pobj))
+               GOTO(log, rc = PTR_ERR(pobj));
+
+       if (unlikely(!dt_try_as_dir(env, pobj)))
                GOTO(log, rc = -ENOTDIR);
 
+       cobj = lfsck_object_locate(dev, child);
+       if (IS_ERR(cobj))
+               GOTO(log, rc = PTR_ERR(cobj));
+
        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);
 
@@ -1153,15 +1180,15 @@ static int lfsck_namespace_insert_normal(const struct lu_env *env,
        if (IS_ERR(th))
                GOTO(unlock, rc = PTR_ERR(th));
 
-       rec->rec_type = lfsck_object_type(child) & S_IFMT;
-       rec->rec_fid = lfsck_dto2fid(child);
-       rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
+       rec->rec_type = lfsck_object_type(cobj) & S_IFMT;
+       rec->rec_fid = lfsck_dto2fid(cobj);
+       rc = dt_declare_insert(env, pobj, (const struct dt_rec *)rec,
                               (const struct dt_key *)name, th);
        if (rc != 0)
                GOTO(stop, rc);
 
        if (S_ISDIR(rec->rec_type)) {
-               rc = dt_declare_ref_add(env, parent, th);
+               rc = dt_declare_ref_add(env, pobj, th);
                if (rc != 0)
                        GOTO(stop, rc);
        }
@@ -1169,11 +1196,11 @@ static int lfsck_namespace_insert_normal(const struct lu_env *env,
        memset(la, 0, sizeof(*la));
        la->la_ctime = cfs_time_current_sec();
        la->la_valid = LA_CTIME;
-       rc = dt_declare_attr_set(env, parent, la, th);
+       rc = dt_declare_attr_set(env, pobj, la, th);
        if (rc != 0)
                GOTO(stop, rc);
 
-       rc = dt_declare_attr_set(env, child, la, th);
+       rc = dt_declare_attr_set(env, cobj, la, th);
        if (rc != 0)
                GOTO(stop, rc);
 
@@ -1181,25 +1208,25 @@ static int lfsck_namespace_insert_normal(const struct lu_env *env,
        if (rc != 0)
                GOTO(stop, rc);
 
-       rc = dt_insert(env, parent, (const struct dt_rec *)rec,
+       rc = dt_insert(env, pobj, (const struct dt_rec *)rec,
                       (const struct dt_key *)name, th, BYPASS_CAPA, 1);
        if (rc != 0)
                GOTO(stop, rc);
 
        if (S_ISDIR(rec->rec_type)) {
-               dt_write_lock(env, parent, 0);
-               rc = dt_ref_add(env, parent, th);
-               dt_write_unlock(env, parent);
+               dt_write_lock(env, pobj, 0);
+               rc = dt_ref_add(env, pobj, th);
+               dt_write_unlock(env, pobj);
                if (rc != 0)
                        GOTO(stop, rc);
        }
 
        la->la_ctime = cfs_time_current_sec();
-       rc = dt_attr_set(env, parent, la, th, BYPASS_CAPA);
+       rc = dt_attr_set(env, pobj, la, th, BYPASS_CAPA);
        if (rc != 0)
                GOTO(stop, rc);
 
-       rc = dt_attr_set(env, child, la, th, BYPASS_CAPA);
+       rc = dt_attr_set(env, cobj, la, th, BYPASS_CAPA);
 
        GOTO(stop, rc = (rc == 0 ? 1 : rc));
 
@@ -1207,7 +1234,7 @@ 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 "
@@ -1259,11 +1286,10 @@ 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;
@@ -1310,26 +1336,35 @@ 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);
                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, BYPASS_CAPA);
+       if (unlikely(rc == 0)) {
+               lfsck_unlock(llh);
+               goto again;
+       }
+
+       if (rc != -ENOENT)
+               GOTO(unlock1, rc);
+
        cname->ln_name = name;
        cname->ln_namelen = namelen;
 
@@ -1338,8 +1373,8 @@ 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);
@@ -1361,39 +1396,39 @@ 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);
 
        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);
+               rc = dt_declare_ref_add(env, orphan, th);
 
        if (rc != 0)
                GOTO(stop, rc);
 
-       rc = dt_declare_ref_add(env, child, th);
+       rc = dt_declare_ref_add(env, orphan, 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);
@@ -1401,7 +1436,7 @@ 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);
@@ -1419,38 +1454,38 @@ 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,
+       rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
                       (const struct dt_key *)dot, th, BYPASS_CAPA, 1);
        if (rc != 0)
                GOTO(unlock2, rc);
 
        rec->rec_fid = lfsck_dto2fid(parent);
-       rc = dt_insert(env, child, (const struct dt_rec *)rec,
+       rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
                       (const struct dt_key *)dotdot, th,
                       BYPASS_CAPA, 1);
        if (rc != 0)
                GOTO(unlock2, rc);
 
-       rc = dt_ref_add(env, child, th);
+       rc = dt_ref_add(env, orphan, th);
        if (rc != 0)
                GOTO(unlock2, rc);
 
        if (lmv != NULL) {
-               rc = dt_xattr_set(env, child, &lmv_buf, XATTR_NAME_LMV, 0,
+               rc = dt_xattr_set(env, orphan, &lmv_buf, XATTR_NAME_LMV, 0,
                                  th, BYPASS_CAPA);
                if (rc != 0)
                        GOTO(unlock2, rc);
        }
 
-       rc = dt_xattr_set(env, child, &linkea_buf,
+       rc = dt_xattr_set(env, orphan, &linkea_buf,
                          XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
-       dt_write_unlock(env, child);
+       dt_write_unlock(env, orphan);
        if (rc != 0)
                GOTO(stop, rc);
 
@@ -1466,13 +1501,13 @@ 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);
 
 unlock1:
-       lfsck_ibits_unlock(&lh, LCK_EX);
+       lfsck_unlock(llh);
 
 log:
        CDEBUG(D_LFSCK, "%s: namespace LFSCK create orphan dir for "
@@ -1480,9 +1515,6 @@ 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);
 
@@ -1521,7 +1553,7 @@ 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 };
@@ -1531,8 +1563,8 @@ static int lfsck_namespace_shrink_linkea(const struct lu_env *env,
        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);
 
@@ -1647,20 +1679,21 @@ 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);
 
@@ -1679,7 +1712,7 @@ 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);
@@ -1738,10 +1771,12 @@ 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 };
+       struct dt_object                *pobj   = NULL;
+       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;
@@ -1749,8 +1784,18 @@ 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. */
+
+       pobj = lfsck_object_locate(dev, parent);
+       if (IS_ERR(pobj))
+               GOTO(log, rc = PTR_ERR(pobj));
+
+       if (unlikely(!dt_try_as_dir(env, pobj)))
+               GOTO(log, rc = -ENOTDIR);
+
+       rc = lfsck_lock(env, lfsck, parent, name, pllh,
+                       MDS_INODELOCK_UPDATE, LCK_PW);
        if (rc != 0)
                GOTO(log, rc);
 
@@ -1759,9 +1804,9 @@ 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;
@@ -1770,12 +1815,12 @@ 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,
+       rc = dt_lookup(env, pobj, (struct dt_rec *)&tfid,
                       (const struct dt_key *)name, BYPASS_CAPA);
        if (rc == -ENOENT) {
                exist = false;
@@ -1790,18 +1835,19 @@ 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, BYPASS_CAPA);
        if (rc != 0)
                GOTO(log, rc);
 
@@ -1811,7 +1857,7 @@ 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,
+               rc = dt_xattr_get(env, cobj, &LU_BUF_NULL, XATTR_NAME_LOV,
                                  BYPASS_CAPA);
                /* If someone has created related OST-object(s),
                 * then keep it. */
@@ -1831,7 +1877,7 @@ replace:
        if (rc != 0)
                GOTO(log, rc);
 
-       rc = linkea_links_find(&ldata, cname, lfsck_dto2fid(parent));
+       rc = linkea_links_find(&ldata, cname, lfsck_dto2fid(pobj));
        /* Someone moved the child, no need to replace. */
        if (rc != 0)
                GOTO(log, rc = 0);
@@ -1844,37 +1890,38 @@ 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);
        }
 
-       rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
+       rc = dt_declare_delete(env, pobj, (const struct dt_key *)name, th);
        if (rc != 0)
                GOTO(stop, rc);
 
        rec->rec_type = S_IFDIR;
        rec->rec_fid = lfsck_dto2fid(child);
-       rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
+       rc = dt_declare_insert(env, pobj, (const struct dt_rec *)rec,
                               (const struct dt_key *)name, 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);
 
        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, pobj, (const struct dt_key *)name, th, BYPASS_CAPA);
+       if (rc != 0 && rc != -ENOENT)
+               GOTO(stop, rc);
 
-       rc = dt_insert(env, parent, (const struct dt_rec *)rec,
+       rc = dt_insert(env, pobj, (const struct dt_rec *)rec,
                       (const struct dt_key *)name, th, BYPASS_CAPA, 1);
 
        GOTO(stop, rc = (rc == 0 ? 1 : rc));
@@ -1884,9 +1931,10 @@ 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
@@ -1918,7 +1966,7 @@ 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;
@@ -1999,21 +2047,27 @@ 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             *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;
 
        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);
 
@@ -2041,7 +2095,7 @@ int lfsck_namespace_repair_dirent(const struct lu_env *env,
                        GOTO(stop, rc);
        }
 
-       rc = dt_trans_start(env, dev, th);
+       rc = dt_trans_start_local(env, dev, th);
        if (rc != 0)
                GOTO(stop, rc);
 
@@ -2099,7 +2153,9 @@ 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 "
@@ -2146,7 +2202,7 @@ 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;
@@ -2854,9 +2910,8 @@ 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 };
@@ -2869,13 +2924,8 @@ static int lfsck_namespace_repair_nlink(const struct lu_env *env,
        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);
 
@@ -2884,7 +2934,7 @@ 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);
 
@@ -2892,7 +2942,7 @@ 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
@@ -2914,11 +2964,11 @@ static int lfsck_namespace_repair_nlink(const struct lu_env *env,
        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, BYPASS_CAPA);
        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));
 
@@ -2930,21 +2980,18 @@ 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, BYPASS_CAPA);
 
        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);
@@ -3737,7 +3784,7 @@ 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));
 
@@ -3757,7 +3804,7 @@ 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);
@@ -3846,10 +3893,9 @@ 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;
                }
@@ -4011,11 +4057,9 @@ 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;
 
@@ -4106,7 +4150,6 @@ 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),
@@ -4564,8 +4607,7 @@ 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));
 
@@ -4725,14 +4767,16 @@ 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                *pobj   = NULL;
+       struct dt_object                *cobj   = NULL;
        const struct lu_name            *cname;
        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;
@@ -4748,27 +4792,37 @@ 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. */
+
+       pobj = lfsck_object_locate(dev, parent);
+       if (IS_ERR(pobj))
+               GOTO(log, rc = PTR_ERR(pobj));
+
+       if (unlikely(!dt_try_as_dir(env, pobj)))
+               GOTO(log, rc = -ENOTDIR);
+
+       cobj = lfsck_object_locate(dev, child);
+       if (IS_ERR(cobj))
+               GOTO(log, rc = PTR_ERR(cobj));
+
        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, lfsck_dto2fid(pobj));
        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);
 
-       rc = lfsck_namespace_check_exist(env, parent, child, lnr->lnr_name);
+       rc = lfsck_namespace_check_exist(env, pobj, cobj, lnr->lnr_name);
        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,
@@ -4778,8 +4832,8 @@ int lfsck_namespace_repair_dangling(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);
+       cobj->do_ops->do_ah_init(env, hint, pobj, cobj,
+                                la->la_mode & S_IFMT);
 
        memset(dof, 0, sizeof(*dof));
        dof->dof_type = dt_mode_to_dft(type);
@@ -4787,34 +4841,38 @@ 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);
+       rc = dt_declare_create(env, cobj, la, hint, dof, th);
        if (rc != 0)
                GOTO(stop, rc);
 
        if (S_ISDIR(type)) {
-               if (unlikely(!dt_try_as_dir(env, child)))
+               if (unlikely(!dt_try_as_dir(env, cobj)))
                        GOTO(stop, rc = -ENOTDIR);
 
                /* 2a. insert dot into child dir */
                rec->rec_type = S_IFDIR;
-               rec->rec_fid = lfsck_dto2fid(child);
-               rc = dt_declare_insert(env, child,
+               rec->rec_fid = lfsck_dto2fid(cobj);
+               rc = dt_declare_insert(env, cobj,
                                       (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);
-               rc = dt_declare_insert(env, child,
+               rec->rec_fid = lfsck_dto2fid(pobj);
+               rc = dt_declare_insert(env, cobj,
                                       (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);
+               rc = dt_declare_ref_add(env, cobj, th);
                if (rc != 0)
                        GOTO(stop, rc);
 
@@ -4824,7 +4882,7 @@ int lfsck_namespace_repair_dangling(const struct lu_env *env,
 
                        idx = lfsck_shard_name_to_index(env,
                                        lnr->lnr_name, lnr->lnr_namelen,
-                                       type, lfsck_dto2fid(child));
+                                       type, lfsck_dto2fid(cobj));
                        if (unlikely(idx < 0))
                                GOTO(stop, rc = idx);
 
@@ -4834,7 +4892,7 @@ int lfsck_namespace_repair_dangling(const struct lu_env *env,
 
                        lfsck_lmv_header_cpu_to_le(lmv2, lmv2);
                        lfsck_buf_init(&lmv_buf, lmv2, sizeof(*lmv2));
-                       rc = dt_declare_xattr_set(env, child, &lmv_buf,
+                       rc = dt_declare_xattr_set(env, cobj, &lmv_buf,
                                                  XATTR_NAME_LMV, 0, th);
                        if (rc != 0)
                                GOTO(stop, rc);
@@ -4844,49 +4902,46 @@ int lfsck_namespace_repair_dangling(const struct lu_env *env,
        /* 6a. insert linkEA for child */
        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, cobj, &linkea_buf,
                                  XATTR_NAME_LINK, 0, 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 == -EEXIST ? 1 : rc));
 
-       dt_write_lock(env, child, 0);
+       dt_write_lock(env, cobj, 0);
        /* 1b. create child */
-       rc = dt_create(env, child, la, hint, dof, th);
+       rc = dt_create(env, cobj, la, hint, dof, th);
        if (rc != 0)
                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,
+               rec->rec_fid = lfsck_dto2fid(cobj);
+               rc = dt_insert(env, cobj, (const struct dt_rec *)rec,
                               (const struct dt_key *)dot, th, BYPASS_CAPA, 1);
                if (rc != 0)
                        GOTO(unlock, rc);
 
                /* 3b. insert dotdot into child dir */
-               rec->rec_fid = lfsck_dto2fid(parent);
-               rc = dt_insert(env, child, (const struct dt_rec *)rec,
+               rec->rec_fid = lfsck_dto2fid(pobj);
+               rc = dt_insert(env, cobj, (const struct dt_rec *)rec,
                               (const struct dt_key *)dotdot, th,
                               BYPASS_CAPA, 1);
                if (rc != 0)
                        GOTO(unlock, rc);
 
                /* 4b. increase child nlink */
-               rc = dt_ref_add(env, child, th);
+               rc = dt_ref_add(env, cobj, th);
                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,
+                       rc = dt_xattr_set(env, cobj, &lmv_buf, XATTR_NAME_LMV,
                                          0, th, BYPASS_CAPA);
                        if (rc != 0)
                                GOTO(unlock, rc);
@@ -4894,23 +4949,23 @@ int lfsck_namespace_repair_dangling(const struct lu_env *env,
        }
 
        /* 6b. insert linkEA for child. */
-       rc = dt_xattr_set(env, child, &linkea_buf,
+       rc = dt_xattr_set(env, cobj, &linkea_buf,
                          XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
 
        GOTO(unlock, rc);
 
 unlock:
-       dt_write_unlock(env, child);
+       dt_write_unlock(env, cobj);
 
 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)),
+              PFID(&lnr->lnr_lar.lar_fid), PFID(lfsck_dto2fid(child)),
               type, cname->ln_name,
               create ? "Create the lost OST-object as required" :
                        "Keep the MDT-object there by default", rc);
@@ -4962,6 +5017,9 @@ static int lfsck_namespace_assistant_handler_p1(const struct lu_env *env,
        if (unlikely(lfsck_is_dead_obj(dir)))
                GOTO(put_dir, rc = 0);
 
+       if (unlikely(!dt_try_as_dir(env, dir)))
+               GOTO(put_dir, rc = -ENOTDIR);
+
        pfid = lfsck_dto2fid(dir);
        la->la_nlink = 0;
        if (lnr->lnr_attr & LUDA_UPGRADE) {
@@ -5008,8 +5066,7 @@ static int lfsck_namespace_assistant_handler_p1(const struct lu_env *env,
                GOTO(put_dir, 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) {
@@ -5022,7 +5079,7 @@ 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);
 
@@ -5097,7 +5154,7 @@ 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);
 
@@ -5330,7 +5387,7 @@ out:
                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))
@@ -5394,7 +5451,7 @@ out:
                lfsck_object_put(env, obj);
 
 put_dir:
-       lu_object_put(env, &dir->do_lu);
+       lfsck_object_put(env, dir);
 
        return rc;
 }
@@ -5547,7 +5604,7 @@ stop:
        dt_trans_stop(env, dev, th);
 
 out:
-       lu_object_put(env, &child->do_lu);
+       lfsck_object_put(env, child);
 
        return rc;
 }
@@ -5577,19 +5634,19 @@ 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));
@@ -5649,7 +5706,7 @@ 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:
                         *
@@ -5674,8 +5731,7 @@ 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;
                }
 
@@ -5715,7 +5771,7 @@ 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);
 }
 
 /**
@@ -5886,7 +5942,7 @@ 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;
@@ -6170,7 +6226,6 @@ 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
@@ -6178,10 +6233,10 @@ 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;
@@ -6285,10 +6340,10 @@ 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
@@ -6296,19 +6351,20 @@ 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);
 
@@ -6316,26 +6372,26 @@ 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,
+       rc = dt_delete(env, dir, (const struct dt_key *)name, th,
                       BYPASS_CAPA);
        if (rc == -ENOENT) {
                exists = false;
@@ -6345,12 +6401,12 @@ 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,
+       rc = dt_insert(env, dir, (const struct dt_rec *)rec,
                       (const struct dt_key *)name, th, BYPASS_CAPA, 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);
@@ -6359,11 +6415,10 @@ 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;
 }
@@ -6417,9 +6472,10 @@ 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));
 
@@ -6468,7 +6524,7 @@ 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",