+/**
+ * Echo Server request handler for OST_SETATTR RPC.
+ *
+ * This is Echo Server part of request handling. It sets common
+ * attributes from request to the Echo Server objects.
+ *
+ * \param[in] tsi target session environment for this request
+ *
+ * \retval 0 if successful
+ * \retval negative value on error
+ */
+static int esd_setattr_hdl(struct tgt_session_info *tsi)
+{
+ struct ost_body *body = tsi->tsi_ost_body;
+ struct obd_device *obd = tsi->tsi_exp->exp_obd;
+ struct ost_body *repbody;
+
+ ENTRY;
+
+ if (!(body->oa.o_valid & OBD_MD_FLID)) {
+ CERROR("%s: obdo missing FLID valid flag: %#llx\n",
+ tsi->tsi_exp->exp_obd->obd_name,
+ body->oa.o_valid);
+ RETURN(-EINVAL);
+ }
+
+ repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
+ if (!repbody)
+ RETURN(-ENOMEM);
+
+ repbody->oa.o_oi = body->oa.o_oi;
+ repbody->oa.o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
+
+ obd->u.echo.eo_oa = body->oa;
+
+ RETURN(0);
+}
+
+#define OBD_FAIL_OST_READ_NET OBD_FAIL_OST_BRW_NET
+#define OBD_FAIL_OST_WRITE_NET OBD_FAIL_OST_BRW_NET
+#define OST_BRW_READ OST_READ
+#define OST_BRW_WRITE OST_WRITE
+
+/**
+ * Table of Echo Server specific request handlers
+ *
+ * This table contains all opcodes accepted by Echo Server and
+ * specifies handlers for them. The tgt_request_handler()
+ * uses such table from each target to process incoming
+ * requests.
+ */
+static struct tgt_handler esd_tgt_handlers[] = {
+TGT_RPC_HANDLER(OST_FIRST_OPC, 0, OST_CONNECT, tgt_connect,
+ &RQF_CONNECT, LUSTRE_OBD_VERSION),
+TGT_RPC_HANDLER(OST_FIRST_OPC, 0, OST_DISCONNECT, tgt_disconnect,
+ &RQF_OST_DISCONNECT, LUSTRE_OBD_VERSION),
+TGT_OST_HDL(HAS_BODY | HAS_REPLY, OST_GETATTR, esd_getattr_hdl),
+TGT_OST_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, OST_SETATTR,
+ esd_setattr_hdl),
+TGT_OST_HDL(HAS_REPLY | IS_MUTABLE, OST_CREATE, esd_create_hdl),
+TGT_OST_HDL(HAS_REPLY | IS_MUTABLE, OST_DESTROY, esd_destroy_hdl),
+TGT_OST_HDL(HAS_BODY | HAS_REPLY, OST_BRW_READ, tgt_brw_read),
+TGT_OST_HDL(HAS_BODY | IS_MUTABLE, OST_BRW_WRITE, tgt_brw_write),
+};
+
+static struct tgt_opc_slice esd_common_slice[] = {
+ {
+ .tos_opc_start = OST_FIRST_OPC,
+ .tos_opc_end = OST_LAST_OPC,
+ .tos_hs = esd_tgt_handlers
+ },
+ {
+ .tos_opc_start = OBD_FIRST_OPC,
+ .tos_opc_end = OBD_LAST_OPC,
+ .tos_hs = tgt_obd_handlers
+ },
+ {
+ .tos_opc_start = LDLM_FIRST_OPC,
+ .tos_opc_end = LDLM_LAST_OPC,
+ .tos_hs = tgt_dlm_handlers
+ },
+ {
+ .tos_opc_start = SEC_FIRST_OPC,
+ .tos_opc_end = SEC_LAST_OPC,
+ .tos_hs = tgt_sec_ctx_handlers
+ },
+ {
+ .tos_hs = NULL
+ }
+};
+
+/**
+ * lu_device_operations matrix for ECHO SRV device is NULL,
+ * this device is just serving incoming requests immediately
+ * without building a stack of lu_devices.
+ */
+static struct lu_device_operations echo_srv_lu_ops = { 0 };
+
+/**
+ * Initialize Echo Server device with parameters in the config log \a cfg.
+ *
+ * This is the main starting point of Echo Server initialization. It fills all
+ * parameters with their initial values and starts Echo Server.
+ *
+ * \param[in] env execution environment
+ * \param[in] m Echo Server device
+ * \param[in] ldt LU device type of Echo Server
+ * \param[in] cfg configuration log
+ *
+ * \retval 0 if successful
+ * \retval negative value on error
+ */
+static int echo_srv_init0(const struct lu_env *env,
+ struct echo_srv_device *esd,
+ struct lu_device_type *ldt, struct lustre_cfg *cfg)
+{
+ const char *dev = lustre_cfg_string(cfg, 0);
+ struct obd_device *obd;
+ char ns_name[48];
+ int rc;
+
+ ENTRY;
+
+ obd = class_name2obd(dev);
+ if (!obd) {
+ CERROR("Cannot find obd with name %s\n", dev);
+ RETURN(-ENODEV);
+ }
+
+ spin_lock_init(&obd->u.echo.eo_lock);
+ obd->u.echo.eo_lastino = ECHO_INIT_OID;
+
+ esd->esd_dev.ld_ops = &echo_srv_lu_ops;
+ esd->esd_dev.ld_obd = obd;
+ /* set this lu_device to obd, because error handling need it */
+ obd->obd_lu_dev = &esd->esd_dev;
+
+ /* No connection accepted until configurations will finish */
+ spin_lock(&obd->obd_dev_lock);
+ obd->obd_no_conn = 1;
+ spin_unlock(&obd->obd_dev_lock);
+
+ /* non-replayable target */
+ obd->obd_replayable = 0;
+
+ snprintf(ns_name, sizeof(ns_name), "echotgt-%s", obd->obd_uuid.uuid);
+ obd->obd_namespace = ldlm_namespace_new(obd, ns_name,
+ LDLM_NAMESPACE_SERVER,
+ LDLM_NAMESPACE_MODEST,
+ LDLM_NS_TYPE_OST);
+ if (!obd->obd_namespace)
+ RETURN(-ENOMEM);
+
+ obd->obd_vars = lprocfs_echo_obd_vars;
+ if (!lprocfs_obd_setup(obd, true) &&
+ lprocfs_alloc_obd_stats(obd, LPROC_ECHO_LAST) == 0) {
+ lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_READ_BYTES,
+ LPROCFS_CNTR_AVGMINMAX,
+ "read_bytes", "bytes");
+ lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
+ LPROCFS_CNTR_AVGMINMAX,
+ "write_bytes", "bytes");
+ }
+
+ ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
+ "echo_ldlm_cb_client", &obd->obd_ldlm_client);
+
+ rc = tgt_init(env, &esd->esd_lut, obd, NULL, esd_common_slice,
+ OBD_FAIL_OST_ALL_REQUEST_NET,
+ OBD_FAIL_OST_ALL_REPLY_NET);
+ if (rc)
+ GOTO(err_out, rc);
+
+ spin_lock(&obd->obd_dev_lock);
+ obd->obd_no_conn = 0;
+ spin_unlock(&obd->obd_dev_lock);
+
+ RETURN(0);
+
+err_out:
+ ldlm_namespace_free(obd->obd_namespace, NULL, obd->obd_force);
+ obd->obd_namespace = NULL;
+
+ lprocfs_obd_cleanup(obd);
+ lprocfs_free_obd_stats(obd);
+ RETURN(rc);
+}
+
+/**
+ * Stop the Echo Server device.
+ *
+ * This function stops the Echo Server device and all its subsystems.
+ * This is the end of Echo Server lifecycle.
+ *
+ * \param[in] env execution environment
+ * \param[in] esd ESD device
+ */
+static void echo_srv_fini(const struct lu_env *env,
+ struct echo_srv_device *esd)
+{
+ struct obd_device *obd = echo_srv_obd(esd);
+ struct lu_device *d = &esd->esd_dev;
+ int leaked;
+
+ ENTRY;
+
+ class_disconnect_exports(obd);
+ if (obd->obd_namespace)
+ ldlm_namespace_free_prior(obd->obd_namespace, NULL,
+ obd->obd_force);
+
+ obd_exports_barrier(obd);
+ obd_zombie_barrier();
+
+ tgt_fini(env, &esd->esd_lut);
+
+ if (obd->obd_namespace) {
+ ldlm_namespace_free_post(obd->obd_namespace);
+ obd->obd_namespace = NULL;
+ }
+
+ lprocfs_obd_cleanup(obd);
+ lprocfs_free_obd_stats(obd);
+
+ leaked = atomic_read(&obd->u.echo.eo_prep);
+ if (leaked != 0)
+ CERROR("%d prep/commitrw pages leaked\n", leaked);
+
+ LASSERT(atomic_read(&d->ld_ref) == 0);
+ EXIT;
+}
+
+/**
+ * Implementation of lu_device_type_operations::ldto_device_fini.
+ *
+ * Finalize device. Dual to echo_srv_device_init(). It is called from
+ * obd_precleanup() and stops the current device.
+ *
+ * \param[in] env execution environment
+ * \param[in] d LU device of ESD
+ *
+ * \retval NULL
+ */
+static struct lu_device *echo_srv_device_fini(const struct lu_env *env,
+ struct lu_device *d)
+{
+ ENTRY;
+ echo_srv_fini(env, echo_srv_dev(d));
+ RETURN(NULL);
+}
+
+/**
+ * Implementation of lu_device_type_operations::ldto_device_free.
+ *
+ * Free Echo Server device. Dual to echo_srv_device_alloc().
+ *
+ * \param[in] env execution environment
+ * \param[in] d LU device of ESD
+ *
+ * \retval NULL
+ */
+static struct lu_device *echo_srv_device_free(const struct lu_env *env,
+ struct lu_device *d)
+{
+ struct echo_srv_device *esd = echo_srv_dev(d);
+
+ lu_device_fini(&esd->esd_dev);
+ OBD_FREE_PTR(esd);
+ RETURN(NULL);
+}
+
+/**
+ * Implementation of lu_device_type_operations::ldto_device_alloc.
+ *
+ * This function allocates the new Echo Server device. It is called from
+ * obd_setup() if OBD device had lu_device_type defined.
+ *
+ * \param[in] env execution environment
+ * \param[in] t lu_device_type of ESD device
+ * \param[in] cfg configuration log
+ *
+ * \retval pointer to the lu_device of just allocated OFD
+ * \retval ERR_PTR of return value on error
+ */
+static struct lu_device *echo_srv_device_alloc(const struct lu_env *env,
+ struct lu_device_type *t,
+ struct lustre_cfg *cfg)
+{
+ struct echo_srv_device *esd;
+ struct lu_device *l;
+ int rc;
+
+ OBD_ALLOC_PTR(esd);
+ if (!esd)
+ return ERR_PTR(-ENOMEM);
+
+ l = &esd->esd_dev;
+ lu_device_init(l, t);
+ rc = echo_srv_init0(env, esd, t, cfg);
+ if (rc != 0) {
+ echo_srv_device_free(env, l);
+ l = ERR_PTR(rc);
+ }
+
+ return l;
+}
+
+static const struct lu_device_type_operations echo_srv_type_ops = {
+ .ldto_device_alloc = echo_srv_device_alloc,
+ .ldto_device_free = echo_srv_device_free,
+ .ldto_device_fini = echo_srv_device_fini
+};
+
+struct lu_device_type echo_srv_type = {
+ .ldt_tags = LU_DEVICE_DT,
+ .ldt_name = LUSTRE_ECHO_NAME,
+ .ldt_ops = &echo_srv_type_ops,
+ .ldt_ctx_tags = LCT_DT_THREAD,