+ .do_object_unlock = osp_md_object_unlock,
+};
+
+/**
+ * Implementation of dt_body_operations::dbo_declare_write
+ *
+ * Create the osp_update_request to track the update for this OSP
+ * in the transaction.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to be written
+ * \param[in] buf buffer to write which includes an embedded size field
+ * \param[in] pos offet in the object to start writing at
+ * \param[in] th transaction handle
+ *
+ * \retval 0 if preparation succeeds.
+ * \retval negative errno if preparation fails.
+ */
+static ssize_t osp_md_declare_write(const struct lu_env *env,
+ struct dt_object *dt,
+ const struct lu_buf *buf,
+ loff_t pos, struct thandle *th)
+{
+ return osp_trans_update_request_create(th);
+}
+
+/**
+ * Implementation of dt_body_operations::dbo_write
+ *
+ * Pack the write object update into the RPC buffer, which will be sent
+ * to the remote MDT during transaction stop.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to be written
+ * \param[in] buf buffer to write which includes an embedded size field
+ * \param[in] pos offet in the object to start writing at
+ * \param[in] th transaction handle
+ * \param[in] ignore_quota quota enforcement for this write
+ *
+ * \retval the buffer size in bytes if packing succeeds.
+ * \retval negative errno if packing fails.
+ */
+static ssize_t osp_md_write(const struct lu_env *env, struct dt_object *dt,
+ const struct lu_buf *buf, loff_t *pos,
+ struct thandle *th, int ignore_quota)
+{
+ struct osp_object *obj = dt2osp_obj(dt);
+ struct osp_update_request *update;
+ struct osp_thandle *oth = thandle_to_osp_thandle(th);
+ ssize_t rc;
+ ENTRY;
+
+ update = thandle_to_osp_update_request(th);
+ LASSERT(update != NULL);
+
+ rc = osp_update_rpc_pack(env, write, update, OUT_WRITE,
+ lu_object_fid(&dt->do_lu), buf, *pos);
+ if (rc < 0)
+ RETURN(rc);
+
+ CDEBUG(D_INFO, "write "DFID" offset = "LPU64" length = %zu\n",
+ PFID(lu_object_fid(&dt->do_lu)), *pos, buf->lb_len);
+
+ /* XXX: how about the write error happened later? */
+ *pos += buf->lb_len;
+
+ if (obj->opo_ooa != NULL &&
+ obj->opo_ooa->ooa_attr.la_valid & LA_SIZE &&
+ obj->opo_ooa->ooa_attr.la_size < *pos)
+ obj->opo_ooa->ooa_attr.la_size = *pos;
+
+ rc = osp_check_and_set_rpc_version(oth);
+ if (rc < 0)
+ RETURN(rc);
+
+ RETURN(buf->lb_len);
+}
+
+static ssize_t osp_md_read(const struct lu_env *env, struct dt_object *dt,
+ struct lu_buf *rbuf, loff_t *pos)
+{
+ struct osp_device *osp = lu2osp_dev(dt->do_lu.lo_dev);
+ struct dt_device *dt_dev = &osp->opd_dt_dev;
+ struct lu_buf *lbuf = &osp_env_info(env)->osi_lb2;
+ struct osp_update_request *update = NULL;
+ struct object_update_reply *reply;
+ struct out_read_reply *orr;
+ char *ptr = rbuf->lb_buf;
+ struct ptlrpc_request *req = NULL;
+ size_t total_length = rbuf->lb_len;
+ size_t max_buf_size;
+ loff_t offset = *pos;
+ int rc;
+ ENTRY;
+
+ /* Calculate the maxium buffer length for each read request */
+ max_buf_size = OUT_UPDATE_REPLY_SIZE - cfs_size_round(sizeof(*orr)) -
+ cfs_size_round(sizeof(struct object_update_result)) -
+ cfs_size_round(offsetof(struct object_update_reply,
+ ourp_lens[1]));
+ while (total_length > 0) {
+ size_t read_length;
+
+ /* Because it needs send the update buffer right away,
+ * just create an update buffer, instead of attaching the
+ * update_remote list of the thandle. */
+ update = osp_update_request_create(dt_dev);
+ if (IS_ERR(update))
+ GOTO(out, rc = PTR_ERR(update));
+
+ read_length = total_length > max_buf_size ?
+ max_buf_size : total_length;
+
+ rc = osp_update_rpc_pack(env, read, update, OUT_READ,
+ lu_object_fid(&dt->do_lu),
+ read_length, offset);
+ if (rc != 0) {
+ CERROR("%s: cannot insert update: rc = %d\n",
+ dt_dev->dd_lu_dev.ld_obd->obd_name, rc);
+ GOTO(out, rc);
+ }
+
+ rc = osp_remote_sync(env, osp, update, &req);
+ if (rc < 0)
+ 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: invalid update reply magic %x expected %x:"
+ " rc = %d\n", dt_dev->dd_lu_dev.ld_obd->obd_name,
+ reply->ourp_magic, UPDATE_REPLY_MAGIC, -EPROTO);
+ GOTO(out, rc = -EPROTO);
+ }
+
+ rc = object_update_result_data_get(reply, lbuf, 0);
+ if (rc < 0)
+ GOTO(out, rc);
+
+ if (lbuf->lb_len < sizeof(*orr))
+ GOTO(out, rc = -EPROTO);
+
+ orr = lbuf->lb_buf;
+ orr_le_to_cpu(orr, orr);
+ offset = orr->orr_offset;
+ if (orr->orr_size > max_buf_size)
+ GOTO(out, rc = -EPROTO);
+
+ memcpy(ptr, orr->orr_data, orr->orr_size);
+ ptr += orr->orr_size;
+ total_length -= orr->orr_size;
+
+ CDEBUG(D_INFO, "%s: read "DFID" pos "LPU64" len %u left %zu\n",
+ osp->opd_obd->obd_name, PFID(lu_object_fid(&dt->do_lu)),
+ offset, orr->orr_size, total_length);
+
+ if (orr->orr_size < read_length)
+ break;
+
+ ptlrpc_req_finished(req);
+ osp_update_request_destroy(update);
+ req = NULL;
+ update = NULL;
+ }
+
+ total_length = rbuf->lb_len - total_length;
+ *pos = offset;
+ CDEBUG(D_INFO, "%s: total read "DFID" pos "LPU64" len %zu\n",
+ osp->opd_obd->obd_name, PFID(lu_object_fid(&dt->do_lu)),
+ *pos, total_length);
+ GOTO(out, rc = (int)total_length);
+out:
+ if (req != NULL)
+ ptlrpc_req_finished(req);
+
+ if (update != NULL)
+ osp_update_request_destroy(update);
+
+ return rc;
+}
+
+/* These body operation will be used to write symlinks during migration etc */
+struct dt_body_operations osp_md_body_ops = {
+ .dbo_declare_write = osp_md_declare_write,
+ .dbo_write = osp_md_write,
+ .dbo_read = osp_md_read,