X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Fofd%2Fofd_fs.c;h=9b61f58d41a2233d0cd50b610ff1d94e04a5fa46;hb=7bf1d7c6cb7d0a7231b3fdcb9e3d3ec3129fb427;hp=182875858a28eacdc9177797babac8dce58b2a9a;hpb=9e9efd99580c8e7d2064d7d1f76041843f8a2036;p=fs%2Flustre-release.git

diff --git a/lustre/ofd/ofd_fs.c b/lustre/ofd/ofd_fs.c
index 1828758..9b61f58 100644
--- a/lustre/ofd/ofd_fs.c
+++ b/lustre/ofd/ofd_fs.c
@@ -27,7 +27,7 @@
  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2011, 2012, Whamcloud, Inc.
+ * Copyright (c) 2012, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
@@ -68,30 +68,106 @@ int ofd_record_write(const struct lu_env *env, struct ofd_device *ofd,
 	RETURN(rc);
 }
 
-obd_id ofd_last_id(struct ofd_device *ofd, obd_seq group)
+int ofd_precreate_batch(struct ofd_device *ofd, int batch)
 {
-	obd_id id;
+	int count;
+
+	spin_lock(&ofd->ofd_batch_lock);
+	count = min(ofd->ofd_precreate_batch, batch);
+	spin_unlock(&ofd->ofd_batch_lock);
+
+	return count;
+}
+
+struct ofd_seq *ofd_seq_get(struct ofd_device *ofd, obd_seq seq)
+{
+	struct ofd_seq *oseq;
+
+	read_lock(&ofd->ofd_seq_list_lock);
+	cfs_list_for_each_entry(oseq, &ofd->ofd_seq_list, os_list) {
+		if (oseq->os_seq == seq) {
+			cfs_atomic_inc(&oseq->os_refc);
+			read_unlock(&ofd->ofd_seq_list_lock);
+			return oseq;
+		}
+	}
+	read_unlock(&ofd->ofd_seq_list_lock);
+	return NULL;
+}
 
-	LASSERT(group <= ofd->ofd_max_group);
+static void ofd_seq_destroy(const struct lu_env *env,
+			    struct ofd_seq *oseq)
+{
+	LASSERT(cfs_list_empty(&oseq->os_list));
+	LASSERT(oseq->os_lastid_obj != NULL);
+	lu_object_put(env, &oseq->os_lastid_obj->do_lu);
+	OBD_FREE_PTR(oseq);
+}
+
+void ofd_seq_put(const struct lu_env *env, struct ofd_seq *oseq)
+{
+	if (cfs_atomic_dec_and_test(&oseq->os_refc))
+		ofd_seq_destroy(env, oseq);
+}
+
+static void ofd_seq_delete(const struct lu_env *env, struct ofd_seq *oseq)
+{
+	cfs_list_del_init(&oseq->os_list);
+	ofd_seq_put(env, oseq);
+}
+
+/**
+ * Add a new sequence to the OFD device.
+ *
+ * \param ofd OFD device
+ * \param new_seq new sequence to be added
+ *
+ * \retval the seq to be added or the existing seq
+ **/
+static struct ofd_seq *ofd_seq_add(const struct lu_env *env,
+				   struct ofd_device *ofd,
+				   struct ofd_seq *new_seq)
+{
+	struct ofd_seq *os = NULL;
+
+	write_lock(&ofd->ofd_seq_list_lock);
+	cfs_list_for_each_entry(os, &ofd->ofd_seq_list, os_list) {
+		if (os->os_seq == new_seq->os_seq) {
+			cfs_atomic_inc(&os->os_refc);
+			write_unlock(&ofd->ofd_seq_list_lock);
+			/* The seq has not been added to the list */
+			ofd_seq_put(env, new_seq);
+			return os;
+		}
+	}
+	cfs_atomic_inc(&new_seq->os_refc);
+	cfs_list_add_tail(&new_seq->os_list, &ofd->ofd_seq_list);
+	ofd->ofd_seq_count++;
+	write_unlock(&ofd->ofd_seq_list_lock);
+	return new_seq;
+}
+
+obd_id ofd_seq_last_oid(struct ofd_seq *oseq)
+{
+	obd_id id;
 
-	cfs_spin_lock(&ofd->ofd_objid_lock);
-	id = ofd->ofd_last_objids[group];
-	cfs_spin_unlock(&ofd->ofd_objid_lock);
+	spin_lock(&oseq->os_last_oid_lock);
+	id = oseq->os_last_oid;
+	spin_unlock(&oseq->os_last_oid_lock);
 
 	return id;
 }
 
-void ofd_last_id_set(struct ofd_device *ofd, obd_id id, obd_seq group)
+void ofd_seq_last_oid_set(struct ofd_seq *oseq, obd_id id)
 {
-	LASSERT(group <= ofd->ofd_max_group);
-	cfs_spin_lock(&ofd->ofd_objid_lock);
-	if (ofd->ofd_last_objids[group] < id)
-		ofd->ofd_last_objids[group] = id;
-	cfs_spin_unlock(&ofd->ofd_objid_lock);
+	spin_lock(&oseq->os_last_oid_lock);
+	if (likely(oseq->os_last_oid < id))
+		oseq->os_last_oid = id;
+	spin_unlock(&oseq->os_last_oid_lock);
 }
 
-int ofd_last_id_write(const struct lu_env *env, struct ofd_device *ofd,
-		      obd_seq group)
+int ofd_seq_last_oid_write(const struct lu_env *env, struct ofd_device *ofd,
+			   struct ofd_seq *oseq)
 {
 	struct ofd_thread_info	*info = ofd_info(env);
 	obd_id			 tmp;
@@ -103,72 +179,126 @@ int ofd_last_id_write(const struct lu_env *env, struct ofd_device *ofd,
 	info->fti_buf.lb_len = sizeof(tmp);
 	info->fti_off = 0;
 
-	CDEBUG(D_INODE, "%s: write last_objid for group "LPU64": "LPU64"\n",
-	       ofd_obd(ofd)->obd_name, group, ofd_last_id(ofd, group));
+	CDEBUG(D_INODE, "%s: write last_objid for seq "LPX64" : "LPX64"\n",
+	       ofd_name(ofd), oseq->os_seq, ofd_seq_last_oid(oseq));
 
-	tmp = cpu_to_le64(ofd_last_id(ofd, group));
+	tmp = cpu_to_le64(ofd_seq_last_oid(oseq));
 
-	rc = ofd_record_write(env, ofd, ofd->ofd_lastid_obj[group],
-			      &info->fti_buf, &info->fti_off);
+	rc = ofd_record_write(env, ofd, oseq->os_lastid_obj, &info->fti_buf,
+			      &info->fti_off);
 	RETURN(rc);
 }
 
-int ofd_last_group_write(const struct lu_env *env, struct ofd_device *ofd)
+static void ofd_deregister_seq_exp(struct ofd_device *ofd)
 {
-	struct ofd_thread_info	*info = ofd_info(env);
-	obd_seq			 tmp;
-	int			 rc;
+	struct seq_server_site	*ss = &ofd->ofd_seq_site;
 
-	ENTRY;
+	if (ss->ss_client_seq != NULL) {
+		lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
+		ss->ss_client_seq->lcs_exp = NULL;
+	}
 
-	info->fti_buf.lb_buf = &tmp;
-	info->fti_buf.lb_len = sizeof(tmp);
-	info->fti_off = 0;
+	if (ss->ss_server_fld != NULL) {
+		lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
+		ss->ss_server_fld->lsf_control_exp = NULL;
+	}
+}
 
-	tmp = cpu_to_le32(ofd->ofd_max_group);
+static int ofd_fld_fini(const struct lu_env *env,
+			struct ofd_device *ofd)
+{
+	struct seq_server_site *ss = &ofd->ofd_seq_site;
+	ENTRY;
 
-	rc = ofd_record_write(env, ofd, ofd->ofd_last_group_file,
-			      &info->fti_buf, &info->fti_off);
+	if (ss && ss->ss_server_fld) {
+		fld_server_fini(env, ss->ss_server_fld);
+		OBD_FREE_PTR(ss->ss_server_fld);
+		ss->ss_server_fld = NULL;
+	}
 
-	RETURN(rc);
+	RETURN(0);
 }
 
-void ofd_group_fini(const struct lu_env *env, struct ofd_device *ofd,
-		    int group)
+void ofd_seqs_fini(const struct lu_env *env, struct ofd_device *ofd)
 {
-	LASSERT(ofd->ofd_lastid_obj[group]);
-	lu_object_put(env, &ofd->ofd_lastid_obj[group]->do_lu);
-	ofd->ofd_lastid_obj[group] = NULL;
+	struct ofd_seq  *oseq;
+	struct ofd_seq  *tmp;
+	cfs_list_t       dispose;
+	int		rc;
+
+	ofd_deregister_seq_exp(ofd);
+
+	rc = ofd_fid_fini(env, ofd);
+	if (rc != 0)
+		CERROR("%s: fid fini error: rc = %d\n", ofd_name(ofd), rc);
+
+	rc = ofd_fld_fini(env, ofd);
+	if (rc != 0)
+		CERROR("%s: fld fini error: rc = %d\n", ofd_name(ofd), rc);
+
+	CFS_INIT_LIST_HEAD(&dispose);
+	write_lock(&ofd->ofd_seq_list_lock);
+	cfs_list_for_each_entry_safe(oseq, tmp, &ofd->ofd_seq_list, os_list) {
+		cfs_list_move(&oseq->os_list, &dispose);
+	}
+	write_unlock(&ofd->ofd_seq_list_lock);
+
+	while (!cfs_list_empty(&dispose)) {
+		oseq = container_of0(dispose.next, struct ofd_seq, os_list);
+		ofd_seq_delete(env, oseq);
+	}
+
+	LASSERT(cfs_list_empty(&ofd->ofd_seq_list));
+	return;
 }
 
-int ofd_group_load(const struct lu_env *env, struct ofd_device *ofd, int group)
+/**
+ *
+ * \retval the seq with seq number or errno (never NULL)
+ */
+struct ofd_seq *ofd_seq_load(const struct lu_env *env, struct ofd_device *ofd,
+			     obd_seq seq)
 {
 	struct ofd_thread_info	*info = ofd_info(env);
+	struct ofd_seq		*oseq = NULL;
 	struct dt_object	*dob;
 	obd_id			 lastid;
 	int			 rc;
 
 	ENTRY;
 
-	/* if group is already initialized */
-	if (ofd->ofd_lastid_obj[group])
-		RETURN(0);
+	/* if seq is already initialized */
+	oseq = ofd_seq_get(ofd, seq);
+	if (oseq != NULL)
+		RETURN(oseq);
+
+	OBD_ALLOC_PTR(oseq);
+	if (oseq == NULL)
+		RETURN(ERR_PTR(-ENOMEM));
 
-	lu_local_obj_fid(&info->fti_fid, OFD_GROUP0_LAST_OID + group);
+	lu_last_id_fid(&info->fti_fid, seq);
 	memset(&info->fti_attr, 0, sizeof(info->fti_attr));
 	info->fti_attr.la_valid = LA_MODE;
 	info->fti_attr.la_mode = S_IFREG |  S_IRUGO | S_IWUSR;
 	info->fti_dof.dof_type = dt_mode_to_dft(S_IFREG);
 
-	/* create object tracking per-group last created
+	/* create object tracking per-seq last created
 	 * id to be used by orphan recovery mechanism */
 	dob = dt_find_or_create(env, ofd->ofd_osd, &info->fti_fid,
 				&info->fti_dof, &info->fti_attr);
-	if (IS_ERR(dob))
-		RETURN(PTR_ERR(dob));
+	if (IS_ERR(dob)) {
+		OBD_FREE_PTR(oseq);
+		RETURN((void *)dob);
+	}
 
-	ofd->ofd_lastid_obj[group] = dob;
-	cfs_mutex_init(&ofd->ofd_create_locks[group]);
+	oseq->os_lastid_obj = dob;
+
+	CFS_INIT_LIST_HEAD(&oseq->os_list);
+	mutex_init(&oseq->os_create_lock);
+	spin_lock_init(&oseq->os_last_oid_lock);
+	oseq->os_seq = seq;
+
+	cfs_atomic_set(&oseq->os_refc, 1);
 
 	rc = dt_attr_get(env, dob, &info->fti_attr, BYPASS_CAPA);
 	if (rc)
@@ -176,10 +306,8 @@ int ofd_group_load(const struct lu_env *env, struct ofd_device *ofd, int group)
 
 	if (info->fti_attr.la_size == 0) {
 		/* object is just created, initialize last id */
-		ofd->ofd_last_objids[group] = OFD_INIT_OBJID;
-		ofd_last_id_set(ofd, OFD_INIT_OBJID, group);
-		ofd_last_id_write(env, ofd, group);
-		ofd_last_group_write(env, ofd);
+		oseq->os_last_oid = OFD_INIT_OBJID;
+		ofd_seq_last_oid_write(env, ofd, oseq);
 	} else if (info->fti_attr.la_size == sizeof(lastid)) {
 		info->fti_off = 0;
 		info->fti_buf.lb_buf = &lastid;
@@ -187,78 +315,106 @@ int ofd_group_load(const struct lu_env *env, struct ofd_device *ofd, int group)
 
 		rc = dt_record_read(env, dob, &info->fti_buf, &info->fti_off);
 		if (rc) {
-			CERROR("can't read last_id: %d\n", rc);
+			CERROR("%s: can't read last_id: rc = %d\n",
+				ofd_name(ofd), rc);
 			GOTO(cleanup, rc);
 		}
-		ofd->ofd_last_objids[group] = le64_to_cpu(lastid);
+		oseq->os_last_oid = le64_to_cpu(lastid);
 	} else {
-		CERROR("corrupted size %Lu LAST_ID of group %u\n",
-		       (unsigned long long)info->fti_attr.la_size, group);
-		rc = -EINVAL;
+		CERROR("%s: corrupted size "LPU64" LAST_ID of seq "LPX64"\n",
+			ofd_name(ofd), (__u64)info->fti_attr.la_size, seq);
+		GOTO(cleanup, rc = -EINVAL);
 	}
 
-	RETURN(0);
+	oseq = ofd_seq_add(env, ofd, oseq);
+	RETURN((oseq != NULL) ? oseq : ERR_PTR(-ENOENT));
 cleanup:
-	ofd_group_fini(env, ofd, group);
-	RETURN(rc);
+	ofd_seq_put(env, oseq);
+	return ERR_PTR(rc);
 }
 
-/* ofd groups managements */
-int ofd_groups_init(const struct lu_env *env, struct ofd_device *ofd)
+static int ofd_fld_init(const struct lu_env *env, const char *uuid,
+			struct ofd_device *ofd)
 {
-	struct ofd_thread_info	*info = ofd_info(env);
-	unsigned long		 groups_size;
-	obd_seq			 last_group;
-	int			 rc = 0;
-	int			 i;
-
+	struct seq_server_site *ss = &ofd->ofd_seq_site;
+	int rc;
 	ENTRY;
 
-	cfs_spin_lock_init(&ofd->ofd_objid_lock);
+	OBD_ALLOC_PTR(ss->ss_server_fld);
+	if (ss->ss_server_fld == NULL)
+		RETURN(rc = -ENOMEM);
 
-	rc = dt_attr_get(env, ofd->ofd_last_group_file,
-			 &info->fti_attr, BYPASS_CAPA);
-	if (rc)
-		GOTO(cleanup, rc);
+	rc = fld_server_init(env, ss->ss_server_fld, ofd->ofd_osd, uuid,
+			     ss->ss_node_id, LU_SEQ_RANGE_OST);
+	if (rc) {
+		OBD_FREE_PTR(ss->ss_server_fld);
+		ss->ss_server_fld = NULL;
+		RETURN(rc);
+	}
+	RETURN(0);
+}
 
-	groups_size = (unsigned long)info->fti_attr.la_size;
+static int ofd_register_seq_exp(struct ofd_device *ofd)
+{
+	struct seq_server_site	*ss = &ofd->ofd_seq_site;
+	char			*lwp_name = NULL;
+	int			rc;
+
+	OBD_ALLOC(lwp_name, MAX_OBD_NAME);
+	if (lwp_name == NULL)
+		GOTO(out_free, rc = -ENOMEM);
+
+	rc = tgt_name2lwpname(ofd_name(ofd), lwp_name);
+	if (rc != 0)
+		GOTO(out_free, rc);
+
+	rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
+				      NULL, NULL);
+	if (rc != 0)
+		GOTO(out_free, rc);
+
+	rc = lustre_register_lwp_item(lwp_name,
+				      &ss->ss_server_fld->lsf_control_exp,
+				      NULL, NULL);
+	if (rc != 0) {
+		lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
+		ss->ss_client_seq->lcs_exp = NULL;
+		GOTO(out_free, rc);
+	}
+out_free:
+	if (lwp_name != NULL)
+		OBD_FREE(lwp_name, MAX_OBD_NAME);
 
-	if (groups_size == sizeof(last_group)) {
-		info->fti_off = 0;
-		info->fti_buf.lb_buf = &last_group;
-		info->fti_buf.lb_len = sizeof(last_group);
+	return rc;
+}
 
-		rc = dt_record_read(env, ofd->ofd_last_group_file,
-				    &info->fti_buf, &info->fti_off);
-		if (rc) {
-			CERROR("can't read LAST_GROUP: %d\n", rc);
-			GOTO(cleanup, rc);
-		}
+/* object sequence management */
+int ofd_seqs_init(const struct lu_env *env, struct ofd_device *ofd)
+{
+	int rc;
 
-		ofd->ofd_max_group = le32_to_cpu(last_group);
-		LASSERT(ofd->ofd_max_group <= OFD_MAX_GROUPS);
-	} else if (groups_size == 0) {
-		ofd->ofd_max_group = 0;
-	} else {
-		CERROR("groups file is corrupted? size = %lu\n", groups_size);
-		GOTO(cleanup, rc = -EIO);
+	rc = ofd_fid_init(env, ofd);
+	if (rc != 0) {
+		CERROR("%s: fid init error: rc = %d\n", ofd_name(ofd), rc);
+		return rc;
 	}
 
-	for (i = 0; i <= ofd->ofd_max_group; i++) {
-		rc = ofd_group_load(env, ofd, i);
-		if (rc) {
-			CERROR("can't load group %d: %d\n", i, rc);
-			/* Clean all previously set groups */
-			while (i > 0)
-				ofd_group_fini(env, ofd, --i);
-			GOTO(cleanup, rc);
-		}
+	rc = ofd_fld_init(env, ofd_name(ofd), ofd);
+	if (rc) {
+		CERROR("%s: Can't init fld, rc %d\n", ofd_name(ofd), rc);
+		return rc;
 	}
 
-	CWARN("%s: %u groups initialized\n",
-	      ofd_obd(ofd)->obd_name, ofd->ofd_max_group + 1);
-cleanup:
-	RETURN(rc);
+	rc = ofd_register_seq_exp(ofd);
+	if (rc) {
+		CERROR("%s: Can't init seq exp, rc %d\n", ofd_name(ofd), rc);
+		return rc;
+	}
+
+	rwlock_init(&ofd->ofd_seq_list_lock);
+	CFS_INIT_LIST_HEAD(&ofd->ofd_seq_list);
+	ofd->ofd_seq_count = 0;
+	return rc;
 }
 
 int ofd_clients_data_init(const struct lu_env *env, struct ofd_device *ofd,
@@ -287,10 +443,11 @@ int ofd_clients_data_init(const struct lu_env *env, struct ofd_device *ofd,
 		 * fsfilt_read_record(), in case sizeof(*lcd)
 		 * isn't the same as fsd->lsd_client_size.  */
 		off = lsd->lsd_client_start + cl_idx * lsd->lsd_client_size;
-		rc = lut_client_data_read(env, &ofd->ofd_lut, lcd, &off, cl_idx);
+		rc = tgt_client_data_read(env, &ofd->ofd_lut, lcd, &off, cl_idx);
 		if (rc) {
-			CERROR("error reading FILT %s idx %d off %llu: rc %d\n",
-			       LAST_RCVD, cl_idx, off, rc);
+			CERROR("%s: error reading FILT %s idx %d off %llu: "
+			       "rc = %d\n", ofd_name(ofd), LAST_RCVD, cl_idx,
+			       off, rc);
 			rc = 0;
 			break; /* read error shouldn't cause startup to fail */
 		}
@@ -315,7 +472,8 @@ int ofd_clients_data_init(const struct lu_env *env, struct ofd_device *ofd,
 		if (IS_ERR(exp)) {
 			if (PTR_ERR(exp) == -EALREADY) {
 				/* export already exists, zero out this one */
-				CERROR("Duplicate export %s!\n", lcd->lcd_uuid);
+				CERROR("%s: Duplicate export %s!\n",
+				       ofd_name(ofd), lcd->lcd_uuid);
 				continue;
 			}
 			GOTO(err_out, rc = PTR_ERR(exp));
@@ -324,14 +482,14 @@ int ofd_clients_data_init(const struct lu_env *env, struct ofd_device *ofd,
 		fed = &exp->exp_filter_data;
 		*fed->fed_ted.ted_lcd = *lcd;
 
-		rc = lut_client_add(env, exp, cl_idx);
+		rc = tgt_client_add(env, exp, cl_idx);
 		LASSERTF(rc == 0, "rc = %d\n", rc); /* can't fail existing */
 		/* VBR: set export last committed version */
 		exp->exp_last_committed = last_rcvd;
-		cfs_spin_lock(&exp->exp_lock);
+		spin_lock(&exp->exp_lock);
 		exp->exp_connecting = 0;
 		exp->exp_in_recovery = 0;
-		cfs_spin_unlock(&exp->exp_lock);
+		spin_unlock(&exp->exp_lock);
 		obd->obd_max_recoverable_clients++;
 		class_export_put(exp);
 
@@ -339,10 +497,10 @@ int ofd_clients_data_init(const struct lu_env *env, struct ofd_device *ofd,
 		CDEBUG(D_OTHER, "client at idx %d has last_rcvd = "LPU64"\n",
 		       cl_idx, last_rcvd);
 
-		cfs_spin_lock(&ofd->ofd_lut.lut_translock);
+		spin_lock(&ofd->ofd_lut.lut_translock);
 		if (last_rcvd > lsd->lsd_last_transno)
 			lsd->lsd_last_transno = last_rcvd;
-		cfs_spin_unlock(&ofd->ofd_lut.lut_translock);
+		spin_unlock(&ofd->ofd_lut.lut_translock);
 	}
 
 err_out:
@@ -355,8 +513,9 @@ int ofd_server_data_init(const struct lu_env *env, struct ofd_device *ofd)
 	struct ofd_thread_info	*info = ofd_info(env);
 	struct lr_server_data	*lsd = &ofd->ofd_lut.lut_lsd;
 	struct obd_device	*obd = ofd_obd(ofd);
-	unsigned long		 last_rcvd_size;
-	int			 rc;
+	unsigned long		last_rcvd_size;
+	__u32			index;
+	int			rc;
 
 	rc = dt_attr_get(env, ofd->ofd_lut.lut_last_rcvd, &info->fti_attr,
 			 BYPASS_CAPA);
@@ -369,6 +528,13 @@ int ofd_server_data_init(const struct lu_env *env, struct ofd_device *ofd)
 	CLASSERT (offsetof(struct lr_server_data, lsd_padding) +
 		  sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
 
+	rc = server_name2index(obd->obd_name, &index, NULL);
+	if (rc < 0) {
+		CERROR("%s: Can not get index from obd_name: rc = %d\n",
+		       obd->obd_name, rc);
+		RETURN(rc);
+	}
+
 	if (last_rcvd_size == 0) {
 		LCONSOLE_WARN("%s: new disk, initializing\n", obd->obd_name);
 
@@ -381,8 +547,9 @@ int ofd_server_data_init(const struct lu_env *env, struct ofd_device *ofd)
 		lsd->lsd_client_size = LR_CLIENT_SIZE;
 		lsd->lsd_subdir_count = FILTER_SUBDIR_COUNT;
 		lsd->lsd_feature_incompat = OBD_INCOMPAT_OST;
+		lsd->lsd_osd_index = index;
 	} else {
-		rc = lut_server_data_read(env, &ofd->ofd_lut);
+		rc = tgt_server_data_read(env, &ofd->ofd_lut);
 		if (rc) {
 			CDEBUG(D_INODE,"OBD ofd: error reading %s: rc %d\n",
 			       LAST_RCVD, rc);
@@ -396,6 +563,17 @@ int ofd_server_data_init(const struct lu_env *env, struct ofd_device *ofd)
 				       obd->obd_uuid.uuid, lsd->lsd_uuid);
 			GOTO(err_fsd, rc = -EINVAL);
 		}
+
+		if (lsd->lsd_osd_index == 0) {
+			lsd->lsd_osd_index = index;
+		} else if (lsd->lsd_osd_index != index) {
+			LCONSOLE_ERROR("%s: index %d in last rcvd is different"
+				       " with the index %d in config log."
+				       " It might be disk corruption!\n",
+				       obd->obd_name, lsd->lsd_osd_index,
+				       index);
+			GOTO(err_fsd, rc = -EINVAL);
+		}
 	}
 
 	lsd->lsd_mount_count++;
@@ -439,12 +617,13 @@ int ofd_server_data_init(const struct lu_env *env, struct ofd_device *ofd)
 
 	rc = ofd_clients_data_init(env, ofd, last_rcvd_size);
 
-	cfs_spin_lock(&ofd->ofd_lut.lut_translock);
+	spin_lock(&ofd->ofd_lut.lut_translock);
 	obd->obd_last_committed = lsd->lsd_last_transno;
-	cfs_spin_unlock(&ofd->ofd_lut.lut_translock);
+	ofd->ofd_lut.lut_last_transno = lsd->lsd_last_transno;
+	spin_unlock(&ofd->ofd_lut.lut_translock);
 
 	/* save it, so mount count and last_transno is current */
-	rc = lut_server_data_update(env, &ofd->ofd_lut, 0);
+	rc = tgt_server_data_update(env, &ofd->ofd_lut, 0);
 	if (rc)
 		GOTO(err_fsd, rc);
 
@@ -494,26 +673,11 @@ int ofd_fs_setup(const struct lu_env *env, struct ofd_device *ofd,
 
 	ofd->ofd_health_check_file = fo;
 
-	lu_local_obj_fid(&info->fti_fid, OFD_LAST_GROUP_OID);
-	memset(&info->fti_attr, 0, sizeof(info->fti_attr));
-	info->fti_attr.la_valid = LA_MODE;
-	info->fti_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
-	info->fti_dof.dof_type = dt_mode_to_dft(S_IFREG);
-
-	fo = dt_find_or_create(env, ofd->ofd_osd, &info->fti_fid,
-			       &info->fti_dof, &info->fti_attr);
-	if (IS_ERR(fo))
-		GOTO(out_hc, rc = PTR_ERR(fo));
-
-	ofd->ofd_last_group_file = fo;
-
-	rc = ofd_groups_init(env, ofd);
+	rc = ofd_seqs_init(env, ofd);
 	if (rc)
-		GOTO(out_lg, rc);
+		GOTO(out_hc, rc);
 
 	RETURN(0);
-out_lg:
-	lu_object_put(env, &ofd->ofd_last_group_file->do_lu);
 out_hc:
 	lu_object_put(env, &ofd->ofd_health_check_file->do_lu);
 out:
@@ -529,12 +693,7 @@ void ofd_fs_cleanup(const struct lu_env *env, struct ofd_device *ofd)
 
 	ofd_info_init(env, NULL);
 
-	for (i = 0; i <= ofd->ofd_max_group; i++) {
-		if (ofd->ofd_lastid_obj[i]) {
-			ofd_last_id_write(env, ofd, i);
-			ofd_group_fini(env, ofd, i);
-		}
-	}
+	ofd_seqs_fini(env, ofd);
 
 	i = dt_sync(env, ofd->ofd_osd);
 	if (i)
@@ -543,11 +702,6 @@ void ofd_fs_cleanup(const struct lu_env *env, struct ofd_device *ofd)
 	/* Remove transaction callback */
 	dt_txn_callback_del(ofd->ofd_osd, &ofd->ofd_txn_cb);
 
-	if (ofd->ofd_last_group_file) {
-		lu_object_put(env, &ofd->ofd_last_group_file->do_lu);
-		ofd->ofd_last_group_file = NULL;
-	}
-
 	if (ofd->ofd_health_check_file) {
 		lu_object_put(env, &ofd->ofd_health_check_file->do_lu);
 		ofd->ofd_health_check_file = NULL;