X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Fosp%2Fosp_object.c;h=966d75190bba13582b9f73179db8e6fefec7b614;hb=cd3aa902bfcf529a6774df3a207a2c3287c994fb;hp=337b71085843ac71d2cb6a492e2a7dc2521e81a3;hpb=57070c9a3ab4c5c17bb06c942fc0d4a2e5519e1b;p=fs%2Flustre-release.git

diff --git a/lustre/osp/osp_object.c b/lustre/osp/osp_object.c
index 337b710..966d751 100644
--- a/lustre/osp/osp_object.c
+++ b/lustre/osp/osp_object.c
@@ -27,7 +27,7 @@
  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2012, Intel Corporation.
+ * Copyright (c) 2012, 2013, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
@@ -41,13 +41,15 @@
  * Author: Mikhail Pershin <mike.tappro@intel.com>
  */
 
-#ifndef EXPORT_SYMTAB
-# define EXPORT_SYMTAB
-#endif
 #define DEBUG_SUBSYSTEM S_MDS
 
 #include "osp_internal.h"
 
+static inline bool is_ost_obj(struct lu_object *lo)
+{
+	return !lu2osp_dev(lo->lo_dev)->opd_connect_mdt;
+}
+
 static void osp_object_assign_fid(const struct lu_env *env,
 				 struct osp_device *d, struct osp_object *o)
 {
@@ -62,11 +64,323 @@ static void osp_object_assign_fid(const struct lu_env *env,
 	lu_object_assign_fid(env, &o->opo_obj.do_lu, &osi->osi_fid);
 }
 
+static int osp_oac_init(struct osp_object *obj)
+{
+	struct osp_object_attr *ooa;
+
+	OBD_ALLOC_PTR(ooa);
+	if (ooa == NULL)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&ooa->ooa_xattr_list);
+	spin_lock(&obj->opo_lock);
+	if (likely(obj->opo_ooa == NULL)) {
+		obj->opo_ooa = ooa;
+		spin_unlock(&obj->opo_lock);
+	} else {
+		spin_unlock(&obj->opo_lock);
+		OBD_FREE_PTR(ooa);
+	}
+
+	return 0;
+}
+
+static struct osp_xattr_entry *
+osp_oac_xattr_find_locked(struct osp_object_attr *ooa,
+			  const char *name, size_t namelen, bool unlink)
+{
+	struct osp_xattr_entry *oxe;
+
+	list_for_each_entry(oxe, &ooa->ooa_xattr_list, oxe_list) {
+		if (namelen == oxe->oxe_namelen &&
+		    strncmp(name, oxe->oxe_buf, namelen) == 0) {
+			if (unlink)
+				list_del_init(&oxe->oxe_list);
+			else
+				atomic_inc(&oxe->oxe_ref);
+
+			return oxe;
+		}
+	}
+
+	return NULL;
+}
+
+static struct osp_xattr_entry *osp_oac_xattr_find(struct osp_object *obj,
+						  const char *name)
+{
+	struct osp_xattr_entry *oxe = NULL;
+
+	spin_lock(&obj->opo_lock);
+	if (obj->opo_ooa != NULL)
+		oxe = osp_oac_xattr_find_locked(obj->opo_ooa, name,
+						strlen(name), false);
+	spin_unlock(&obj->opo_lock);
+
+	return oxe;
+}
+
+static struct osp_xattr_entry *
+osp_oac_xattr_find_or_add(struct osp_object *obj, const char *name, size_t len)
+{
+	struct osp_object_attr *ooa	= obj->opo_ooa;
+	struct osp_xattr_entry *oxe;
+	struct osp_xattr_entry *tmp	= NULL;
+	size_t			namelen = strlen(name);
+	size_t			size	= sizeof(*oxe) + namelen + 1 + len;
+
+	LASSERT(ooa != NULL);
+
+	oxe = osp_oac_xattr_find(obj, name);
+	if (oxe != NULL)
+		return oxe;
+
+	OBD_ALLOC(oxe, size);
+	if (unlikely(oxe == NULL))
+		return NULL;
+
+	INIT_LIST_HEAD(&oxe->oxe_list);
+	oxe->oxe_buflen = size;
+	oxe->oxe_namelen = namelen;
+	memcpy(oxe->oxe_buf, name, namelen);
+	oxe->oxe_value = oxe->oxe_buf + namelen + 1;
+	/* One ref is for the caller, the other is for the entry on the list. */
+	atomic_set(&oxe->oxe_ref, 2);
+
+	spin_lock(&obj->opo_lock);
+	tmp = osp_oac_xattr_find_locked(ooa, name, namelen, false);
+	if (tmp == NULL)
+		list_add_tail(&oxe->oxe_list, &ooa->ooa_xattr_list);
+	spin_unlock(&obj->opo_lock);
+
+	if (tmp != NULL) {
+		OBD_FREE(oxe, size);
+		oxe = tmp;
+	}
+
+	return oxe;
+}
+
+static struct osp_xattr_entry *
+osp_oac_xattr_replace(struct osp_object *obj,
+		      struct osp_xattr_entry **poxe, size_t len)
+{
+	struct osp_object_attr *ooa	= obj->opo_ooa;
+	struct osp_xattr_entry *old	= *poxe;
+	struct osp_xattr_entry *oxe;
+	struct osp_xattr_entry *tmp	= NULL;
+	size_t			namelen = old->oxe_namelen;
+	size_t			size	= sizeof(*oxe) + namelen + 1 + len;
+
+	LASSERT(ooa != NULL);
+
+	OBD_ALLOC(oxe, size);
+	if (unlikely(oxe == NULL))
+		return NULL;
+
+	INIT_LIST_HEAD(&oxe->oxe_list);
+	oxe->oxe_buflen = size;
+	oxe->oxe_namelen = namelen;
+	memcpy(oxe->oxe_buf, old->oxe_buf, namelen);
+	oxe->oxe_value = oxe->oxe_buf + namelen + 1;
+	/* One ref is for the caller, the other is for the entry on the list. */
+	atomic_set(&oxe->oxe_ref, 2);
+
+	spin_lock(&obj->opo_lock);
+	tmp = osp_oac_xattr_find_locked(ooa, oxe->oxe_buf, namelen, true);
+	list_add_tail(&oxe->oxe_list, &ooa->ooa_xattr_list);
+	spin_unlock(&obj->opo_lock);
+
+	*poxe = tmp;
+	LASSERT(tmp != NULL);
+
+	return oxe;
+}
+
+static inline void osp_oac_xattr_put(struct osp_xattr_entry *oxe)
+{
+	if (atomic_dec_and_test(&oxe->oxe_ref)) {
+		LASSERT(list_empty(&oxe->oxe_list));
+
+		OBD_FREE(oxe, oxe->oxe_buflen);
+	}
+}
+
+static int osp_get_attr_from_reply(const struct lu_env *env,
+				   struct object_update_reply *reply,
+				   struct ptlrpc_request *req,
+				   struct lu_attr *attr,
+				   struct osp_object *obj, int index)
+{
+	struct osp_thread_info	*osi	= osp_env_info(env);
+	struct lu_buf		*rbuf	= &osi->osi_lb2;
+	struct obdo		*lobdo	= &osi->osi_obdo;
+	struct obdo		*wobdo;
+	int			rc;
+
+	rc = object_update_result_data_get(reply, rbuf, index);
+	if (rc < 0)
+		return rc;
+
+	wobdo = rbuf->lb_buf;
+	if (rbuf->lb_len != sizeof(*wobdo))
+		return -EPROTO;
+
+	LASSERT(req != NULL);
+	if (ptlrpc_req_need_swab(req))
+		lustre_swab_obdo(wobdo);
+
+	lustre_get_wire_obdo(NULL, lobdo, wobdo);
+	spin_lock(&obj->opo_lock);
+	if (obj->opo_ooa != NULL) {
+		la_from_obdo(&obj->opo_ooa->ooa_attr, lobdo, lobdo->o_valid);
+		if (attr != NULL)
+			*attr = obj->opo_ooa->ooa_attr;
+	} else {
+		LASSERT(attr != NULL);
+
+		la_from_obdo(attr, lobdo, lobdo->o_valid);
+	}
+	spin_unlock(&obj->opo_lock);
+
+	return 0;
+}
+
+static int osp_attr_get_interpterer(const struct lu_env *env,
+				    struct object_update_reply *reply,
+				    struct ptlrpc_request *req,
+				    struct osp_object *obj,
+				    void *data, int index, int rc)
+{
+	struct lu_attr *attr = data;
+
+	LASSERT(obj->opo_ooa != NULL);
+
+	if (rc == 0) {
+		osp2lu_obj(obj)->lo_header->loh_attr |= LOHA_EXISTS;
+		obj->opo_non_exist = 0;
+
+		return osp_get_attr_from_reply(env, reply, req, NULL, obj,
+					       index);
+	} else {
+		if (rc == -ENOENT) {
+			osp2lu_obj(obj)->lo_header->loh_attr &= ~LOHA_EXISTS;
+			obj->opo_non_exist = 1;
+		}
+
+		spin_lock(&obj->opo_lock);
+		attr->la_valid = 0;
+		spin_unlock(&obj->opo_lock);
+	}
+
+	return 0;
+}
+
+static int osp_declare_attr_get(const struct lu_env *env, struct dt_object *dt,
+				struct lustre_capa *capa)
+{
+	struct osp_object	*obj	= dt2osp_obj(dt);
+	struct osp_device	*osp	= lu2osp_dev(dt->do_lu.lo_dev);
+	int			 rc	= 0;
+
+	if (obj->opo_ooa == NULL) {
+		rc = osp_oac_init(obj);
+		if (rc != 0)
+			return rc;
+	}
+
+	mutex_lock(&osp->opd_async_requests_mutex);
+	rc = osp_insert_async_request(env, OUT_ATTR_GET, obj, 0, NULL, NULL,
+				      &obj->opo_ooa->ooa_attr,
+				      osp_attr_get_interpterer);
+	mutex_unlock(&osp->opd_async_requests_mutex);
+
+	return rc;
+}
+
+int osp_attr_get(const struct lu_env *env, struct dt_object *dt,
+		 struct lu_attr *attr, struct lustre_capa *capa)
+{
+	struct osp_device		*osp = lu2osp_dev(dt->do_lu.lo_dev);
+	struct osp_object		*obj = dt2osp_obj(dt);
+	struct dt_device		*dev = &osp->opd_dt_dev;
+	struct dt_update_request	*update;
+	struct object_update_reply	*reply;
+	struct ptlrpc_request		*req = NULL;
+	int				rc = 0;
+	ENTRY;
+
+	if (is_ost_obj(&dt->do_lu) && obj->opo_non_exist)
+		RETURN(-ENOENT);
+
+	if (obj->opo_ooa != NULL) {
+		spin_lock(&obj->opo_lock);
+		if (obj->opo_ooa->ooa_attr.la_valid != 0) {
+			*attr = obj->opo_ooa->ooa_attr;
+			spin_unlock(&obj->opo_lock);
+
+			RETURN(0);
+		}
+		spin_unlock(&obj->opo_lock);
+	}
+
+	update = out_create_update_req(dev);
+	if (IS_ERR(update))
+		RETURN(PTR_ERR(update));
+
+	rc = out_insert_update(env, update, OUT_ATTR_GET,
+			       lu_object_fid(&dt->do_lu), 0, NULL, NULL);
+	if (rc != 0) {
+		CERROR("%s: Insert update error "DFID": rc = %d\n",
+		       dev->dd_lu_dev.ld_obd->obd_name,
+		       PFID(lu_object_fid(&dt->do_lu)), rc);
+
+		GOTO(out, rc);
+	}
+
+	rc = out_remote_sync(env, osp->opd_obd->u.cli.cl_import, update, &req);
+	if (rc != 0) {
+		if (rc == -ENOENT) {
+			osp2lu_obj(obj)->lo_header->loh_attr &= ~LOHA_EXISTS;
+			obj->opo_non_exist = 1;
+		} else {
+			CERROR("%s:osp_attr_get update error "DFID": rc = %d\n",
+			       dev->dd_lu_dev.ld_obd->obd_name,
+			       PFID(lu_object_fid(&dt->do_lu)), rc);
+		}
+
+		GOTO(out, rc);
+	}
+
+	osp2lu_obj(obj)->lo_header->loh_attr |= LOHA_EXISTS;
+	obj->opo_non_exist = 0;
+	reply = req_capsule_server_sized_get(&req->rq_pill,
+					     &RMF_OUT_UPDATE_REPLY,
+					     OUT_UPDATE_REPLY_SIZE);
+	if (reply == NULL || reply->ourp_magic != UPDATE_REPLY_MAGIC)
+		GOTO(out, rc = -EPROTO);
+
+	rc = osp_get_attr_from_reply(env, reply, req, attr, obj, 0);
+	if (rc != 0)
+		GOTO(out, rc);
+
+	GOTO(out, rc = 0);
+
+out:
+	if (req != NULL)
+		ptlrpc_req_finished(req);
+
+	out_destroy_update_req(update);
+
+	return rc;
+}
+
 static int osp_declare_attr_set(const struct lu_env *env, struct dt_object *dt,
 				const struct lu_attr *attr, struct thandle *th)
 {
 	struct osp_device	*d = lu2osp_dev(dt->do_lu.lo_dev);
 	struct osp_object	*o = dt2osp_obj(dt);
+	struct lu_attr		*la;
 	int			 rc = 0;
 
 	ENTRY;
@@ -94,7 +408,8 @@ static int osp_declare_attr_set(const struct lu_env *env, struct dt_object *dt,
 	if (attr == NULL)
 		RETURN(0);
 
-	if (attr->la_valid & LA_SIZE && attr->la_size > 0) {
+	if (attr->la_valid & LA_SIZE && attr->la_size > 0 &&
+	    fid_is_zero(lu_object_fid(&o->opo_obj.do_lu))) {
 		LASSERT(!dt_object_exists(dt));
 		osp_object_assign_fid(env, d, o);
 		rc = osp_object_truncate(env, dt, attr->la_size);
@@ -110,12 +425,33 @@ static int osp_declare_attr_set(const struct lu_env *env, struct dt_object *dt,
 	if (!(attr->la_valid & (LA_UID | LA_GID)))
 		RETURN(0);
 
-	/*
-	 * track all UID/GID changes via llog
-	 */
-	rc = osp_sync_declare_add(env, o, MDS_SETATTR64_REC, th);
+	if (!is_only_remote_trans(th))
+		/*
+		 * track all UID/GID changes via llog
+		 */
+		rc = osp_sync_declare_add(env, o, MDS_SETATTR64_REC, th);
+	else
+		/* It is for OST-object attr_set directly without updating
+		 * local MDT-object attribute. It is usually used by LFSCK. */
+		rc = osp_md_declare_attr_set(env, dt, attr, th);
+
+	if (rc != 0 || o->opo_ooa == NULL)
+		RETURN(rc);
 
-	RETURN(rc);
+	la = &o->opo_ooa->ooa_attr;
+	spin_lock(&o->opo_lock);
+	if (attr->la_valid & LA_UID) {
+		la->la_uid = attr->la_uid;
+		la->la_valid |= LA_UID;
+	}
+
+	if (attr->la_valid & LA_GID) {
+		la->la_gid = attr->la_gid;
+		la->la_valid |= LA_GID;
+	}
+	spin_unlock(&o->opo_lock);
+
+	RETURN(0);
 }
 
 static int osp_attr_set(const struct lu_env *env, struct dt_object *dt,
@@ -140,17 +476,412 @@ static int osp_attr_set(const struct lu_env *env, struct dt_object *dt,
 		RETURN(0);
 	}
 
-	/*
-	 * once transaction is committed put proper command on
-	 * the queue going to our OST
-	 */
-	rc = osp_sync_add(env, o, MDS_SETATTR64_REC, th, attr);
-
-	/* XXX: send new uid/gid to OST ASAP? */
+	if (!is_only_remote_trans(th))
+		/*
+		 * once transaction is committed put proper command on
+		 * the queue going to our OST
+		 */
+		rc = osp_sync_add(env, o, MDS_SETATTR64_REC, th, attr);
+		/* XXX: send new uid/gid to OST ASAP? */
+	else
+		/* It is for OST-object attr_set directly without updating
+		 * local MDT-object attribute. It is usually used by LFSCK. */
+		rc = osp_md_attr_set(env, dt, attr, th, capa);
 
 	RETURN(rc);
 }
 
+static int osp_xattr_get_interpterer(const struct lu_env *env,
+				     struct object_update_reply *reply,
+				     struct ptlrpc_request *req,
+				     struct osp_object *obj,
+				     void *data, int index, int rc)
+{
+	struct osp_object_attr	*ooa  = obj->opo_ooa;
+	struct osp_xattr_entry	*oxe  = data;
+	struct lu_buf		*rbuf = &osp_env_info(env)->osi_lb2;
+
+	LASSERT(ooa != NULL);
+
+	if (rc == 0) {
+		size_t len = sizeof(*oxe) + oxe->oxe_namelen + 1;
+
+		rc = object_update_result_data_get(reply, rbuf, index);
+		if (rc < 0 || rbuf->lb_len > (oxe->oxe_buflen - len)) {
+			spin_lock(&obj->opo_lock);
+			oxe->oxe_ready = 0;
+			spin_unlock(&obj->opo_lock);
+			osp_oac_xattr_put(oxe);
+
+			return rc < 0 ? rc : -ERANGE;
+		}
+
+		spin_lock(&obj->opo_lock);
+		oxe->oxe_vallen = rbuf->lb_len;
+		memcpy(oxe->oxe_value, rbuf->lb_buf, rbuf->lb_len);
+		oxe->oxe_exist = 1;
+		oxe->oxe_ready = 1;
+		spin_unlock(&obj->opo_lock);
+	} else if (rc == -ENOENT || rc == -ENODATA) {
+		spin_lock(&obj->opo_lock);
+		oxe->oxe_exist = 0;
+		oxe->oxe_ready = 1;
+		spin_unlock(&obj->opo_lock);
+	} else {
+		spin_lock(&obj->opo_lock);
+		oxe->oxe_ready = 0;
+		spin_unlock(&obj->opo_lock);
+	}
+
+	osp_oac_xattr_put(oxe);
+
+	return 0;
+}
+
+static int osp_declare_xattr_get(const struct lu_env *env, struct dt_object *dt,
+				 struct lu_buf *buf, const char *name,
+				 struct lustre_capa *capa)
+{
+	struct osp_object	*obj	 = dt2osp_obj(dt);
+	struct osp_device	*osp	 = lu2osp_dev(dt->do_lu.lo_dev);
+	struct osp_xattr_entry	*oxe;
+	int			 namelen = strlen(name);
+	int			 rc	 = 0;
+
+	LASSERT(buf != NULL);
+	LASSERT(name != NULL);
+
+	/* If only for xattr size, return directly. */
+	if (unlikely(buf->lb_len == 0))
+		return 0;
+
+	if (obj->opo_ooa == NULL) {
+		rc = osp_oac_init(obj);
+		if (rc != 0)
+			return rc;
+	}
+
+	oxe = osp_oac_xattr_find_or_add(obj, name, buf->lb_len);
+	if (oxe == NULL)
+		return -ENOMEM;
+
+	mutex_lock(&osp->opd_async_requests_mutex);
+	rc = osp_insert_async_request(env, OUT_XATTR_GET, obj, 1,
+				      &namelen, &name, oxe,
+				      osp_xattr_get_interpterer);
+	if (rc != 0) {
+		mutex_unlock(&osp->opd_async_requests_mutex);
+		osp_oac_xattr_put(oxe);
+	} else {
+		struct dt_update_request *update;
+
+		/* XXX: Currently, we trigger the batched async OUT
+		 *	RPC via dt_declare_xattr_get(). It is not
+		 *	perfect solution, but works well now.
+		 *
+		 *	We will improve it in the future. */
+		update = osp->opd_async_requests;
+		if (update != NULL && update->dur_req != NULL &&
+		    update->dur_req->ourq_count > 0) {
+			osp->opd_async_requests = NULL;
+			mutex_unlock(&osp->opd_async_requests_mutex);
+			rc = osp_unplug_async_request(env, osp, update);
+		} else {
+			mutex_unlock(&osp->opd_async_requests_mutex);
+		}
+	}
+
+	return rc;
+}
+
+int osp_xattr_get(const struct lu_env *env, struct dt_object *dt,
+		  struct lu_buf *buf, const char *name,
+		  struct lustre_capa *capa)
+{
+	struct osp_device	*osp	= lu2osp_dev(dt->do_lu.lo_dev);
+	struct osp_object	*obj	= dt2osp_obj(dt);
+	struct dt_device	*dev	= &osp->opd_dt_dev;
+	struct lu_buf		*rbuf	= &osp_env_info(env)->osi_lb2;
+	struct dt_update_request *update = NULL;
+	struct ptlrpc_request	*req	= NULL;
+	struct object_update_reply *reply;
+	struct osp_xattr_entry	*oxe	= NULL;
+	const char		*dname  = dt->do_lu.lo_dev->ld_obd->obd_name;
+	int			 namelen;
+	int			 rc	= 0;
+	ENTRY;
+
+	LASSERT(buf != NULL);
+	LASSERT(name != NULL);
+
+	if (unlikely(obj->opo_non_exist))
+		RETURN(-ENOENT);
+
+	oxe = osp_oac_xattr_find(obj, name);
+	if (oxe != NULL) {
+		spin_lock(&obj->opo_lock);
+		if (oxe->oxe_ready) {
+			if (!oxe->oxe_exist)
+				GOTO(unlock, rc = -ENODATA);
+
+			if (buf->lb_buf == NULL)
+				GOTO(unlock, rc = oxe->oxe_vallen);
+
+			if (buf->lb_len < oxe->oxe_vallen)
+				GOTO(unlock, rc = -ERANGE);
+
+			memcpy(buf->lb_buf, oxe->oxe_value, oxe->oxe_vallen);
+
+			GOTO(unlock, rc = oxe->oxe_vallen);
+
+unlock:
+			spin_unlock(&obj->opo_lock);
+			osp_oac_xattr_put(oxe);
+
+			return rc;
+		}
+		spin_unlock(&obj->opo_lock);
+	}
+
+	update = out_create_update_req(dev);
+	if (IS_ERR(update))
+		GOTO(out, rc = PTR_ERR(update));
+
+	namelen = strlen(name) + 1;
+	rc = out_insert_update(env, update, OUT_XATTR_GET,
+			       lu_object_fid(&dt->do_lu), 1, &namelen, &name);
+	if (rc != 0) {
+		CERROR("%s: Insert update error "DFID": rc = %d\n",
+		       dname, PFID(lu_object_fid(&dt->do_lu)), rc);
+
+		GOTO(out, rc);
+	}
+
+	rc = out_remote_sync(env, osp->opd_obd->u.cli.cl_import, update, &req);
+	if (rc != 0) {
+		if (obj->opo_ooa == NULL)
+			GOTO(out, rc);
+
+		if (oxe == NULL)
+			oxe = osp_oac_xattr_find_or_add(obj, name, buf->lb_len);
+
+		if (oxe == NULL) {
+			CWARN("%s: Fail to add xattr (%s) to cache for "
+			      DFID" (1): rc = %d\n", dname, name,
+			      PFID(lu_object_fid(&dt->do_lu)), rc);
+
+			GOTO(out, rc);
+		}
+
+		spin_lock(&obj->opo_lock);
+		if (rc == -ENOENT || rc == -ENODATA) {
+			oxe->oxe_exist = 0;
+			oxe->oxe_ready = 1;
+		} else {
+			oxe->oxe_ready = 0;
+		}
+		spin_unlock(&obj->opo_lock);
+
+		GOTO(out, rc);
+	}
+
+	reply = req_capsule_server_sized_get(&req->rq_pill,
+					     &RMF_OUT_UPDATE_REPLY,
+					     OUT_UPDATE_REPLY_SIZE);
+	if (reply->ourp_magic != UPDATE_REPLY_MAGIC) {
+		CERROR("%s: Wrong version %x expected %x "DFID": rc = %d\n",
+		       dname, reply->ourp_magic, UPDATE_REPLY_MAGIC,
+		       PFID(lu_object_fid(&dt->do_lu)), -EPROTO);
+
+		GOTO(out, rc = -EPROTO);
+	}
+
+	rc = object_update_result_data_get(reply, rbuf, 0);
+	if (rc < 0)
+		GOTO(out, rc);
+
+	if (buf->lb_buf == NULL)
+		GOTO(out, rc = rbuf->lb_len);
+
+	if (unlikely(buf->lb_len < rbuf->lb_len))
+		GOTO(out, rc = -ERANGE);
+
+	memcpy(buf->lb_buf, rbuf->lb_buf, rbuf->lb_len);
+	rc = rbuf->lb_len;
+	if (obj->opo_ooa == NULL)
+		GOTO(out, rc);
+
+	if (oxe == NULL) {
+		oxe = osp_oac_xattr_find_or_add(obj, name, rbuf->lb_len);
+		if (oxe == NULL) {
+			CWARN("%s: Fail to add xattr (%s) to "
+			      "cache for "DFID" (2): rc = %d\n",
+			      dname, name, PFID(lu_object_fid(&dt->do_lu)), rc);
+
+			GOTO(out, rc);
+		}
+	}
+
+	if (oxe->oxe_buflen - oxe->oxe_namelen - 1 < rbuf->lb_len) {
+		struct osp_xattr_entry *old = oxe;
+		struct osp_xattr_entry *tmp;
+
+		tmp = osp_oac_xattr_replace(obj, &old, rbuf->lb_len);
+		osp_oac_xattr_put(oxe);
+		oxe = tmp;
+		if (tmp == NULL) {
+			CWARN("%s: Fail to update xattr (%s) to "
+			      "cache for "DFID": rc = %d\n",
+			      dname, name, PFID(lu_object_fid(&dt->do_lu)), rc);
+			spin_lock(&obj->opo_lock);
+			old->oxe_ready = 0;
+			spin_unlock(&obj->opo_lock);
+
+			GOTO(out, rc);
+		}
+
+		/* Drop the ref for entry on list. */
+		osp_oac_xattr_put(old);
+	}
+
+	spin_lock(&obj->opo_lock);
+	oxe->oxe_vallen = rbuf->lb_len;
+	memcpy(oxe->oxe_value, rbuf->lb_buf, rbuf->lb_len);
+	oxe->oxe_exist = 1;
+	oxe->oxe_ready = 1;
+	spin_unlock(&obj->opo_lock);
+
+	GOTO(out, rc);
+
+out:
+	if (req != NULL)
+		ptlrpc_req_finished(req);
+
+	if (update != NULL && !IS_ERR(update))
+		out_destroy_update_req(update);
+
+	if (oxe != NULL)
+		osp_oac_xattr_put(oxe);
+
+	return rc;
+}
+
+int osp_declare_xattr_set(const struct lu_env *env, struct dt_object *dt,
+			  const struct lu_buf *buf, const char *name,
+			  int flag, struct thandle *th)
+{
+	struct osp_object	*o	 = dt2osp_obj(dt);
+	struct dt_update_request *update;
+	struct lu_fid		*fid;
+	struct osp_xattr_entry	*oxe;
+	int			sizes[3] = {strlen(name), buf->lb_len,
+					    sizeof(int)};
+	char			*bufs[3] = {(char *)name, (char *)buf->lb_buf };
+	int			rc;
+
+	LASSERT(buf->lb_len > 0 && buf->lb_buf != NULL);
+
+	update = out_find_create_update_loc(th, dt);
+	if (IS_ERR(update)) {
+		CERROR("%s: Get OSP update buf failed "DFID": rc = %d\n",
+		       dt->do_lu.lo_dev->ld_obd->obd_name,
+		       PFID(lu_object_fid(&dt->do_lu)),
+		       (int)PTR_ERR(update));
+
+		return PTR_ERR(update);
+	}
+
+	flag = cpu_to_le32(flag);
+	bufs[2] = (char *)&flag;
+
+	fid = (struct lu_fid *)lu_object_fid(&dt->do_lu);
+	rc = out_insert_update(env, update, OUT_XATTR_SET, fid,
+			       ARRAY_SIZE(sizes), sizes, (const char **)bufs);
+	if (rc != 0 || o->opo_ooa == NULL)
+		return rc;
+
+	oxe = osp_oac_xattr_find_or_add(o, name, buf->lb_len);
+	if (oxe == NULL) {
+		CWARN("%s: Fail to add xattr (%s) to cache for "DFID
+		      ": rc = %d\n", dt->do_lu.lo_dev->ld_obd->obd_name,
+		      name, PFID(lu_object_fid(&dt->do_lu)), rc);
+
+		return 0;
+	}
+
+	if (oxe->oxe_buflen - oxe->oxe_namelen - 1 < buf->lb_len) {
+		struct osp_xattr_entry *old = oxe;
+		struct osp_xattr_entry *tmp;
+
+		tmp = osp_oac_xattr_replace(o, &old, buf->lb_len);
+		osp_oac_xattr_put(oxe);
+		oxe = tmp;
+		if (tmp == NULL) {
+			CWARN("%s: Fail to update xattr (%s) to cache for "DFID
+			      ": rc = %d\n", dt->do_lu.lo_dev->ld_obd->obd_name,
+			      name, PFID(lu_object_fid(&dt->do_lu)), rc);
+			spin_lock(&o->opo_lock);
+			old->oxe_ready = 0;
+			spin_unlock(&o->opo_lock);
+
+			return 0;
+		}
+
+		/* Drop the ref for entry on list. */
+		osp_oac_xattr_put(old);
+	}
+
+	spin_lock(&o->opo_lock);
+	oxe->oxe_vallen = buf->lb_len;
+	memcpy(oxe->oxe_value, buf->lb_buf, buf->lb_len);
+	oxe->oxe_exist = 1;
+	oxe->oxe_ready = 1;
+	spin_unlock(&o->opo_lock);
+	osp_oac_xattr_put(oxe);
+
+	return 0;
+}
+
+int osp_xattr_set(const struct lu_env *env, struct dt_object *dt,
+		  const struct lu_buf *buf, const char *name, int fl,
+		  struct thandle *th, struct lustre_capa *capa)
+{
+	CDEBUG(D_INFO, "xattr %s set object "DFID"\n", name,
+	       PFID(&dt->do_lu.lo_header->loh_fid));
+
+	return 0;
+}
+
+int osp_declare_xattr_del(const struct lu_env *env, struct dt_object *dt,
+			  const char *name, struct thandle *th)
+{
+	struct dt_update_request *update;
+	const struct lu_fid	 *fid;
+	int			 size = strlen(name);
+	int			 rc;
+
+	update = out_find_create_update_loc(th, dt);
+	if (IS_ERR(update))
+		return PTR_ERR(update);
+
+	fid = lu_object_fid(&dt->do_lu);
+
+	rc = out_insert_update(env, update, OUT_XATTR_DEL, fid, 1, &size,
+			       (const char **)&name);
+
+	return rc;
+}
+
+int osp_xattr_del(const struct lu_env *env, struct dt_object *dt,
+		  const char *name, struct thandle *th,
+		  struct lustre_capa *capa)
+{
+	CDEBUG(D_INFO, "xattr %s del object "DFID"\n", name,
+	       PFID(&dt->do_lu.lo_header->loh_fid));
+
+	return 0;
+}
+
 static int osp_declare_object_create(const struct lu_env *env,
 				     struct dt_object *dt,
 				     struct lu_attr *attr,
@@ -161,11 +892,19 @@ static int osp_declare_object_create(const struct lu_env *env,
 	struct osp_thread_info	*osi = osp_env_info(env);
 	struct osp_device	*d = lu2osp_dev(dt->do_lu.lo_dev);
 	struct osp_object	*o = dt2osp_obj(dt);
-	const struct lu_fid	*fid;
+	const struct lu_fid	*fid = lu_object_fid(&dt->do_lu);
 	int			 rc = 0;
 
 	ENTRY;
 
+	if (is_only_remote_trans(th)) {
+		LASSERT(fid_is_sane(fid));
+
+		rc = osp_md_declare_object_create(env, dt, attr, hint, dof, th);
+
+		RETURN(rc);
+	}
+
 	/* should happen to non-0 OSP only so that at least one object
 	 * has been already declared in the scenario and LOD should
 	 * cleanup that */
@@ -173,7 +912,6 @@ static int osp_declare_object_create(const struct lu_env *env,
 		RETURN(-ENOSPC);
 
 	LASSERT(d->opd_last_used_oid_file);
-	fid = lu_object_fid(&dt->do_lu);
 
 	/*
 	 * There can be gaps in precreated ids and record to unlink llog
@@ -186,9 +924,10 @@ static int osp_declare_object_create(const struct lu_env *env,
 	if (unlikely(!fid_is_zero(fid))) {
 		/* replay case: caller knows fid */
 		osi->osi_off = sizeof(osi->osi_id) * d->opd_index;
+		osi->osi_lb.lb_len = sizeof(osi->osi_id);
+		osi->osi_lb.lb_buf = NULL;
 		rc = dt_declare_record_write(env, d->opd_last_used_oid_file,
-					     sizeof(osi->osi_id), osi->osi_off,
-					     th);
+					     &osi->osi_lb, osi->osi_off, th);
 		RETURN(rc);
 	}
 
@@ -210,9 +949,10 @@ static int osp_declare_object_create(const struct lu_env *env,
 
 		/* common for all OSPs file hystorically */
 		osi->osi_off = sizeof(osi->osi_id) * d->opd_index;
+		osi->osi_lb.lb_len = sizeof(osi->osi_id);
+		osi->osi_lb.lb_buf = NULL;
 		rc = dt_declare_record_write(env, d->opd_last_used_oid_file,
-					     sizeof(osi->osi_id), osi->osi_off,
-					     th);
+					     &osi->osi_lb, osi->osi_off, th);
 	} else {
 		/* not needed in the cache anymore */
 		set_bit(LU_OBJECT_HEARD_BANSHEE,
@@ -233,6 +973,17 @@ static int osp_object_create(const struct lu_env *env, struct dt_object *dt,
 	struct lu_fid		*fid = &osi->osi_fid;
 	ENTRY;
 
+	if (is_only_remote_trans(th)) {
+		LASSERT(fid_is_sane(lu_object_fid(&dt->do_lu)));
+
+		rc = osp_md_object_create(env, dt, attr, hint, dof, th);
+		if (rc == 0)
+			o->opo_non_exist = 0;
+
+		RETURN(rc);
+	}
+
+	o->opo_non_exist = 0;
 	if (o->opo_reserved) {
 		/* regular case, fid is assigned holding trunsaction open */
 		 osp_object_assign_fid(env, d, o);
@@ -240,18 +991,19 @@ static int osp_object_create(const struct lu_env *env, struct dt_object *dt,
 
 	memcpy(fid, lu_object_fid(&dt->do_lu), sizeof(*fid));
 
-	LASSERTF(fid_is_sane(fid), "fid for osp_obj %p is insane"DFID"!\n",
-		 osp_obj, PFID(fid));
+	LASSERTF(fid_is_sane(fid), "fid for osp_object %p is insane"DFID"!\n",
+		 o, PFID(fid));
 
 	if (!o->opo_reserved) {
 		/* special case, id was assigned outside of transaction
 		 * see comments in osp_declare_attr_set */
+		LASSERT(d->opd_pre != NULL);
 		spin_lock(&d->opd_pre_lock);
 		osp_update_last_fid(d, fid);
 		spin_unlock(&d->opd_pre_lock);
 	}
 
-	CDEBUG(D_INODE, "fid for osp_obj %p is "DFID"!\n", osp_obj, PFID(fid));
+	CDEBUG(D_INODE, "fid for osp_object %p is "DFID"\n", o, PFID(fid));
 
 	/* If the precreate ends, it means it will be ready to rollover to
 	 * the new sequence soon, all the creation should be synchronized,
@@ -269,10 +1021,13 @@ static int osp_object_create(const struct lu_env *env, struct dt_object *dt,
 
 	/* we might have lost precreated objects */
 	if (unlikely(d->opd_gap_count) > 0) {
+		LASSERT(d->opd_pre != NULL);
 		spin_lock(&d->opd_pre_lock);
 		if (d->opd_gap_count > 0) {
 			int count = d->opd_gap_count;
-			osi->osi_oi.oi_id = fid_oid(&d->opd_gap_start_fid);
+
+			ostid_set_id(&osi->osi_oi,
+				     fid_oid(&d->opd_gap_start_fid));
 			d->opd_gap_count = 0;
 			spin_unlock(&d->opd_pre_lock);
 
@@ -303,8 +1058,8 @@ static int osp_object_create(const struct lu_env *env, struct dt_object *dt,
 	RETURN(rc);
 }
 
-static int osp_declare_object_destroy(const struct lu_env *env,
-				      struct dt_object *dt, struct thandle *th)
+int osp_declare_object_destroy(const struct lu_env *env,
+			       struct dt_object *dt, struct thandle *th)
 {
 	struct osp_object	*o = dt2osp_obj(dt);
 	int			 rc = 0;
@@ -319,14 +1074,15 @@ static int osp_declare_object_destroy(const struct lu_env *env,
 	RETURN(rc);
 }
 
-static int osp_object_destroy(const struct lu_env *env, struct dt_object *dt,
-			      struct thandle *th)
+int osp_object_destroy(const struct lu_env *env, struct dt_object *dt,
+		       struct thandle *th)
 {
 	struct osp_object	*o = dt2osp_obj(dt);
 	int			 rc = 0;
 
 	ENTRY;
 
+	o->opo_non_exist = 1;
 	/*
 	 * once transaction is committed put proper command on
 	 * the queue going to our OST
@@ -339,23 +1095,469 @@ static int osp_object_destroy(const struct lu_env *env, struct dt_object *dt,
 	RETURN(rc);
 }
 
+static int osp_orphan_index_lookup(const struct lu_env *env,
+				   struct dt_object *dt,
+				   struct dt_rec *rec,
+				   const struct dt_key *key,
+				   struct lustre_capa *capa)
+{
+	return -EOPNOTSUPP;
+}
+
+static int osp_orphan_index_declare_insert(const struct lu_env *env,
+					   struct dt_object *dt,
+					   const struct dt_rec *rec,
+					   const struct dt_key *key,
+					   struct thandle *handle)
+{
+	return -EOPNOTSUPP;
+}
+
+static int osp_orphan_index_insert(const struct lu_env *env,
+				   struct dt_object *dt,
+				   const struct dt_rec *rec,
+				   const struct dt_key *key,
+				   struct thandle *handle,
+				   struct lustre_capa *capa,
+				   int ignore_quota)
+{
+	return -EOPNOTSUPP;
+}
+
+static int osp_orphan_index_declare_delete(const struct lu_env *env,
+					   struct dt_object *dt,
+					   const struct dt_key *key,
+					   struct thandle *handle)
+{
+	return -EOPNOTSUPP;
+}
+
+static int osp_orphan_index_delete(const struct lu_env *env,
+				   struct dt_object *dt,
+				   const struct dt_key *key,
+				   struct thandle *handle,
+				   struct lustre_capa *capa)
+{
+	return -EOPNOTSUPP;
+}
+
+struct dt_it *osp_it_init(const struct lu_env *env, struct dt_object *dt,
+			  __u32 attr, struct lustre_capa *capa)
+{
+	struct osp_it *it;
+
+	OBD_ALLOC_PTR(it);
+	if (it == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	it->ooi_pos_ent = -1;
+	it->ooi_obj = dt;
+
+	return (struct dt_it *)it;
+}
+
+void osp_it_fini(const struct lu_env *env, struct dt_it *di)
+{
+	struct osp_it	*it = (struct osp_it *)di;
+	struct page	**pages	= it->ooi_pages;
+	int		npages = it->ooi_total_npages;
+	int		i;
+
+	if (pages != NULL) {
+		for (i = 0; i < npages; i++) {
+			if (pages[i] != NULL) {
+				if (pages[i] == it->ooi_cur_page) {
+					kunmap(pages[i]);
+					it->ooi_cur_page = NULL;
+				}
+				__free_page(pages[i]);
+			}
+		}
+		OBD_FREE(pages, npages * sizeof(*pages));
+	}
+	OBD_FREE_PTR(it);
+}
+
+static int osp_it_fetch(const struct lu_env *env, struct osp_it *it)
+{
+	struct lu_device	 *dev	= it->ooi_obj->do_lu.lo_dev;
+	struct osp_device	 *osp	= lu2osp_dev(dev);
+	struct page		**pages;
+	struct ptlrpc_request	 *req	= NULL;
+	struct ptlrpc_bulk_desc  *desc;
+	struct idx_info 	 *ii;
+	int			  npages;
+	int			  rc;
+	int			  i;
+	ENTRY;
+
+	/* 1MB bulk */
+	npages = min_t(unsigned int, OFD_MAX_BRW_SIZE, 1 << 20);
+	npages /= PAGE_CACHE_SIZE;
+
+	OBD_ALLOC(pages, npages * sizeof(*pages));
+	if (pages == NULL)
+		RETURN(-ENOMEM);
+
+	it->ooi_pages = pages;
+	it->ooi_total_npages = npages;
+	for (i = 0; i < npages; i++) {
+		pages[i] = alloc_page(GFP_IOFS);
+		if (pages[i] == NULL)
+			RETURN(-ENOMEM);
+	}
+
+	req = ptlrpc_request_alloc(osp->opd_obd->u.cli.cl_import,
+				   &RQF_OBD_IDX_READ);
+	if (req == NULL)
+		RETURN(-ENOMEM);
+
+	rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, OBD_IDX_READ);
+	if (rc != 0) {
+		ptlrpc_request_free(req);
+		RETURN(rc);
+	}
+
+	req->rq_request_portal = OUT_PORTAL;
+	ii = req_capsule_client_get(&req->rq_pill, &RMF_IDX_INFO);
+	memset(ii, 0, sizeof(*ii));
+	if (fid_is_last_id(lu_object_fid(&it->ooi_obj->do_lu))) {
+		/* LFSCK will iterate orphan object[FID_SEQ_LAYOUT_BTREE,
+		 * ost_index, 0] with LAST_ID FID, so it needs to replace
+		 * the FID with orphan FID here */
+		ii->ii_fid.f_seq = FID_SEQ_LAYOUT_RBTREE;
+		ii->ii_fid.f_oid = osp->opd_index;
+		ii->ii_fid.f_ver = 0;
+		ii->ii_flags = II_FL_NOHASH;
+	} else {
+		ii->ii_fid = *lu_object_fid(&it->ooi_obj->do_lu);
+		ii->ii_flags = II_FL_NOHASH | II_FL_NOKEY | II_FL_VARKEY |
+			       II_FL_VARREC;
+	}
+	ii->ii_magic = IDX_INFO_MAGIC;
+	ii->ii_count = npages * LU_PAGE_COUNT;
+	ii->ii_hash_start = it->ooi_next;
+	ii->ii_attrs =
+		osp->opd_storage->dd_lu_dev.ld_site->ld_seq_site->ss_node_id;
+
+	ptlrpc_at_set_req_timeout(req);
+
+	desc = ptlrpc_prep_bulk_imp(req, npages, 1, BULK_PUT_SINK,
+				    MDS_BULK_PORTAL);
+	if (desc == NULL) {
+		ptlrpc_request_free(req);
+		RETURN(-ENOMEM);
+	}
+
+	for (i = 0; i < npages; i++)
+		ptlrpc_prep_bulk_page_pin(desc, pages[i], 0, PAGE_CACHE_SIZE);
+
+	ptlrpc_request_set_replen(req);
+	rc = ptlrpc_queue_wait(req);
+	if (rc != 0)
+		GOTO(out, rc);
+
+	rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk,
+					  req->rq_bulk->bd_nob_transferred);
+	if (rc < 0)
+		GOTO(out, rc);
+	rc = 0;
+
+	ii = req_capsule_server_get(&req->rq_pill, &RMF_IDX_INFO);
+	if (ii->ii_magic != IDX_INFO_MAGIC)
+		 GOTO(out, rc = -EPROTO);
+
+	npages = (ii->ii_count + LU_PAGE_COUNT - 1) >>
+		 (PAGE_CACHE_SHIFT - LU_PAGE_SHIFT);
+	if (npages > it->ooi_total_npages) {
+		CERROR("%s: returned more pages than expected, %u > %u\n",
+		       osp->opd_obd->obd_name, npages, it->ooi_total_npages);
+		GOTO(out, rc = -EINVAL);
+	}
+
+	it->ooi_valid_npages = npages;
+	if (ptlrpc_rep_need_swab(req))
+		it->ooi_swab = 1;
+
+	it->ooi_next = ii->ii_hash_end;
+
+out:
+	ptlrpc_req_finished(req);
+
+	return rc;
+}
+
+int osp_it_next_page(const struct lu_env *env, struct dt_it *di)
+{
+	struct osp_it		*it = (struct osp_it *)di;
+	struct lu_idxpage	*idxpage;
+	struct page		**pages;
+	int			rc;
+	int			i;
+	ENTRY;
+
+again2:
+	idxpage = it->ooi_cur_idxpage;
+	if (idxpage != NULL) {
+		if (idxpage->lip_nr == 0)
+			RETURN(1);
+
+		if (it->ooi_pos_ent < idxpage->lip_nr) {
+			CDEBUG(D_INFO, "ooi_pos %d nr %d\n",
+			       (int)it->ooi_pos_ent, (int)idxpage->lip_nr);
+			RETURN(0);
+		}
+		it->ooi_cur_idxpage = NULL;
+		it->ooi_pos_lu_page++;
+again1:
+		if (it->ooi_pos_lu_page < LU_PAGE_COUNT) {
+			it->ooi_cur_idxpage = (void *)it->ooi_cur_page +
+					 LU_PAGE_SIZE * it->ooi_pos_lu_page;
+			if (it->ooi_swab)
+				lustre_swab_lip_header(it->ooi_cur_idxpage);
+			if (it->ooi_cur_idxpage->lip_magic != LIP_MAGIC) {
+				struct osp_device *osp =
+					lu2osp_dev(it->ooi_obj->do_lu.lo_dev);
+
+				CERROR("%s: invalid magic (%x != %x) for page "
+				       "%d/%d while read layout orphan index\n",
+				       osp->opd_obd->obd_name,
+				       it->ooi_cur_idxpage->lip_magic,
+				       LIP_MAGIC, it->ooi_pos_page,
+				       it->ooi_pos_lu_page);
+				/* Skip this lu_page next time. */
+				it->ooi_pos_ent = idxpage->lip_nr - 1;
+				RETURN(-EINVAL);
+			}
+			it->ooi_pos_ent = -1;
+			goto again2;
+		}
+
+		kunmap(it->ooi_cur_page);
+		it->ooi_cur_page = NULL;
+		it->ooi_pos_page++;
+
+again0:
+		pages = it->ooi_pages;
+		if (it->ooi_pos_page < it->ooi_valid_npages) {
+			it->ooi_cur_page = kmap(pages[it->ooi_pos_page]);
+			it->ooi_pos_lu_page = 0;
+			goto again1;
+		}
+
+		for (i = 0; i < it->ooi_total_npages; i++) {
+			if (pages[i] != NULL)
+				__free_page(pages[i]);
+		}
+		OBD_FREE(pages, it->ooi_total_npages * sizeof(*pages));
+
+		it->ooi_pos_page = 0;
+		it->ooi_total_npages = 0;
+		it->ooi_valid_npages = 0;
+		it->ooi_swab = 0;
+		it->ooi_ent = NULL;
+		it->ooi_cur_page = NULL;
+		it->ooi_cur_idxpage = NULL;
+		it->ooi_pages = NULL;
+	}
+
+	if (it->ooi_next == II_END_OFF)
+		RETURN(1);
+
+	rc = osp_it_fetch(env, it);
+	if (rc == 0)
+		goto again0;
+
+	RETURN(rc);
+}
+
+int osp_orphan_it_next(const struct lu_env *env, struct dt_it *di)
+{
+	struct osp_it		*it = (struct osp_it *)di;
+	struct lu_idxpage	*idxpage;
+	int			rc;
+	ENTRY;
+
+again:
+	idxpage = it->ooi_cur_idxpage;
+	if (idxpage != NULL) {
+		if (idxpage->lip_nr == 0)
+			RETURN(1);
+
+		it->ooi_pos_ent++;
+		if (it->ooi_pos_ent < idxpage->lip_nr) {
+			it->ooi_ent =
+				(struct lu_orphan_ent *)idxpage->lip_entries +
+							it->ooi_pos_ent;
+			if (it->ooi_swab)
+				lustre_swab_orphan_ent(it->ooi_ent);
+			RETURN(0);
+		}
+	}
+
+	rc = osp_it_next_page(env, di);
+	if (rc == 0)
+		goto again;
+
+	RETURN(rc);
+}
+
+int osp_it_get(const struct lu_env *env, struct dt_it *di,
+	       const struct dt_key *key)
+{
+	return 1;
+}
+
+void osp_it_put(const struct lu_env *env, struct dt_it *di)
+{
+}
+
+struct dt_key *osp_orphan_it_key(const struct lu_env *env,
+				 const struct dt_it *di)
+{
+	struct osp_it	*it  = (struct osp_it *)di;
+	struct lu_orphan_ent	*ent = (struct lu_orphan_ent *)it->ooi_ent;
+
+	if (likely(ent != NULL))
+		return (struct dt_key *)(&ent->loe_key);
+
+	return NULL;
+}
+
+int osp_orphan_it_key_size(const struct lu_env *env, const struct dt_it *di)
+{
+	return sizeof(struct lu_fid);
+}
+
+int osp_orphan_it_rec(const struct lu_env *env, const struct dt_it *di,
+		      struct dt_rec *rec, __u32 attr)
+{
+	struct osp_it	*it  = (struct osp_it *)di;
+	struct lu_orphan_ent	*ent = (struct lu_orphan_ent *)it->ooi_ent;
+
+	if (likely(ent != NULL)) {
+		*(struct lu_orphan_rec *)rec = ent->loe_rec;
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+__u64 osp_it_store(const struct lu_env *env, const struct dt_it *di)
+{
+	struct osp_it	*it = (struct osp_it *)di;
+
+	return it->ooi_next;
+}
+
+/**
+ * \retval	 +1: locate to the exactly position
+ * \retval	  0: cannot locate to the exactly position,
+ *		     call next() to move to a valid position.
+ * \retval	-ve: on error
+ */
+int osp_orphan_it_load(const struct lu_env *env, const struct dt_it *di,
+		__u64 hash)
+{
+	struct osp_it	*it	= (struct osp_it *)di;
+	int			 rc;
+
+	it->ooi_next = hash;
+	rc = osp_orphan_it_next(env, (struct dt_it *)di);
+	if (rc == 1)
+		return 0;
+
+	if (rc == 0)
+		return 1;
+
+	return rc;
+}
+
+int osp_it_key_rec(const struct lu_env *env, const struct dt_it *di,
+		   void *key_rec)
+{
+	return 0;
+}
+
+static const struct dt_index_operations osp_orphan_index_ops = {
+	.dio_lookup		= osp_orphan_index_lookup,
+	.dio_declare_insert	= osp_orphan_index_declare_insert,
+	.dio_insert		= osp_orphan_index_insert,
+	.dio_declare_delete	= osp_orphan_index_declare_delete,
+	.dio_delete		= osp_orphan_index_delete,
+	.dio_it = {
+		.init		= osp_it_init,
+		.fini		= osp_it_fini,
+		.next		= osp_orphan_it_next,
+		.get		= osp_it_get,
+		.put		= osp_it_put,
+		.key		= osp_orphan_it_key,
+		.key_size	= osp_orphan_it_key_size,
+		.rec		= osp_orphan_it_rec,
+		.store		= osp_it_store,
+		.load		= osp_orphan_it_load,
+		.key_rec	= osp_it_key_rec,
+	}
+};
+
+static int osp_index_try(const struct lu_env *env,
+			 struct dt_object *dt,
+			 const struct dt_index_features *feat)
+{
+	const struct lu_fid *fid = lu_object_fid(&dt->do_lu);
+
+	if (fid_is_last_id(fid) && fid_is_idif(fid))
+		dt->do_index_ops = &osp_orphan_index_ops;
+	else
+		dt->do_index_ops = &osp_md_index_ops;
+	return 0;
+}
+
 struct dt_object_operations osp_obj_ops = {
+	.do_declare_attr_get	= osp_declare_attr_get,
+	.do_attr_get		= osp_attr_get,
 	.do_declare_attr_set	= osp_declare_attr_set,
 	.do_attr_set		= osp_attr_set,
+	.do_declare_xattr_get	= osp_declare_xattr_get,
+	.do_xattr_get		= osp_xattr_get,
+	.do_declare_xattr_set	= osp_declare_xattr_set,
+	.do_xattr_set		= osp_xattr_set,
 	.do_declare_create	= osp_declare_object_create,
 	.do_create		= osp_object_create,
 	.do_declare_destroy	= osp_declare_object_destroy,
 	.do_destroy		= osp_object_destroy,
+	.do_index_try		= osp_index_try,
 };
 
 static int osp_object_init(const struct lu_env *env, struct lu_object *o,
-			   const struct lu_object_conf *unused)
+			   const struct lu_object_conf *conf)
 {
-	struct osp_object *po = lu2osp_obj(o);
+	struct osp_object	*po = lu2osp_obj(o);
+	int			rc = 0;
+	ENTRY;
 
-	po->opo_obj.do_ops = &osp_obj_ops;
+	spin_lock_init(&po->opo_lock);
+	o->lo_header->loh_attr |= LOHA_REMOTE;
 
-	return 0;
+	if (is_ost_obj(o)) {
+		po->opo_obj.do_ops = &osp_obj_ops;
+	} else {
+		struct lu_attr *la = &osp_env_info(env)->osi_attr;
+
+		po->opo_obj.do_ops = &osp_md_obj_ops;
+		po->opo_obj.do_body_ops = &osp_md_body_ops;
+		rc = po->opo_obj.do_ops->do_attr_get(env, lu2dt_obj(o),
+						     la, NULL);
+		if (rc == 0)
+			o->lo_header->loh_attr |=
+				LOHA_EXISTS | (la->la_mode & S_IFMT);
+		if (rc == -ENOENT) {
+			po->opo_non_exist = 1;
+			rc = 0;
+		}
+		init_rwsem(&po->opo_sem);
+	}
+	RETURN(rc);
 }
 
 static void osp_object_free(const struct lu_env *env, struct lu_object *o)
@@ -365,6 +1567,24 @@ static void osp_object_free(const struct lu_env *env, struct lu_object *o)
 
 	dt_object_fini(&obj->opo_obj);
 	lu_object_header_fini(h);
+	if (obj->opo_ooa != NULL) {
+		struct osp_xattr_entry *oxe;
+		struct osp_xattr_entry *tmp;
+		int			count;
+
+		list_for_each_entry_safe(oxe, tmp,
+					 &obj->opo_ooa->ooa_xattr_list,
+					 oxe_list) {
+			list_del(&oxe->oxe_list);
+			count = atomic_read(&oxe->oxe_ref);
+			LASSERTF(count == 1,
+				 "Still has %d users on the xattr entry %.*s\n",
+				 count-1, (int)oxe->oxe_namelen, oxe->oxe_buf);
+
+			OBD_FREE(oxe, oxe->oxe_buflen);
+		}
+		OBD_FREE_PTR(obj->opo_ooa);
+	}
 	OBD_SLAB_FREE_PTR(obj, osp_object_kmem);
 }
 
@@ -380,6 +1600,7 @@ static void osp_object_release(const struct lu_env *env, struct lu_object *o)
 	 * this may require lu_object_put() in LOD
 	 */
 	if (unlikely(po->opo_reserved)) {
+		LASSERT(d->opd_pre != NULL);
 		LASSERT(d->opd_pre_reserved > 0);
 		spin_lock(&d->opd_pre_lock);
 		d->opd_pre_reserved--;
@@ -388,6 +1609,14 @@ static void osp_object_release(const struct lu_env *env, struct lu_object *o)
 		/* not needed in cache any more */
 		set_bit(LU_OBJECT_HEARD_BANSHEE, &o->lo_header->loh_flags);
 	}
+
+	if (is_ost_obj(o))
+		/* XXX: Currently, NOT cache OST-object on MDT because:
+		 *	1. it is not often accessed on MDT.
+		 *	2. avoid up layer (such as LFSCK) to load too many
+		 *	   once-used OST-objects. */
+		set_bit(LU_OBJECT_HEARD_BANSHEE, &o->lo_header->loh_flags);
+
 	EXIT;
 }