+static inline struct tgt_session_info *tgt_ses_info(const struct lu_env *env)
+{
+ struct tgt_session_info *tsi;
+
+ LASSERT(env->le_ses != NULL);
+ tsi = lu_context_key_get(env->le_ses, &tgt_session_key);
+ LASSERT(tsi);
+ return tsi;
+}
+
+/*
+ * Generic unified target support.
+ */
+enum tgt_handler_flags {
+ /*
+ * struct *_body is passed in the incoming message, and object
+ * identified by this fid exists on disk.
+ * *
+ * "habeo corpus" == "I have a body"
+ */
+ HABEO_CORPUS = (1 << 0),
+ /*
+ * struct ldlm_request is passed in the incoming message.
+ *
+ * "habeo clavis" == "I have a key"
+ * */
+ HABEO_CLAVIS = (1 << 1),
+ /*
+ * this request has fixed reply format, so that reply message can be
+ * packed by generic code.
+ *
+ * "habeo refero" == "I have a reply"
+ */
+ HABEO_REFERO = (1 << 2),
+ /*
+ * this request will modify something, so check whether the file system
+ * is readonly or not, then return -EROFS to client asap if necessary.
+ *
+ * "mutabor" == "I shall modify"
+ */
+ MUTABOR = (1 << 3)
+};
+
+struct tgt_handler {
+ /* The name of this handler. */
+ const char *th_name;
+ /* Fail id, check at the beginning */
+ int th_fail_id;
+ /* Operation code */
+ __u32 th_opc;
+ /* Flags in enum tgt_handler_flags */
+ __u32 th_flags;
+ /* Request version for this opcode */
+ int th_version;
+ /* Handler function */
+ int (*th_act)(struct tgt_session_info *tti);
+ /* Request format for this request */
+ const struct req_format *th_fmt;
+};
+
+struct tgt_opc_slice {
+ __u32 tos_opc_start; /* First op code */
+ __u32 tos_opc_end; /* Last op code */
+ struct tgt_handler *tos_hs; /* Registered handler */
+};
+
+static inline struct ptlrpc_request *tgt_ses_req(struct tgt_session_info *tsi)
+{
+ return tsi->tsi_pill ? tsi->tsi_pill->rc_req : NULL;
+}
+
+static inline __u64 tgt_conn_flags(struct tgt_session_info *tsi)
+{
+ LASSERT(tsi->tsi_exp);
+ return exp_connect_flags(tsi->tsi_exp);
+}
+
+static inline int req_is_replay(struct ptlrpc_request *req)
+{
+ LASSERT(req->rq_reqmsg);
+ return !!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY);
+}
+
+/* target/tgt_handler.c */
+int tgt_request_handle(struct ptlrpc_request *req);
+char *tgt_name(struct lu_target *tgt);
+void tgt_counter_incr(struct obd_export *exp, int opcode);
+int tgt_connect_check_sptlrpc(struct ptlrpc_request *req,
+ struct obd_export *exp);
+int tgt_connect(struct tgt_session_info *tsi);
+int tgt_disconnect(struct tgt_session_info *uti);
+int tgt_obd_ping(struct tgt_session_info *tsi);
+int tgt_enqueue(struct tgt_session_info *tsi);
+int tgt_convert(struct tgt_session_info *tsi);
+int tgt_bl_callback(struct tgt_session_info *tsi);
+int tgt_cp_callback(struct tgt_session_info *tsi);
+int tgt_llog_open(struct tgt_session_info *tsi);
+int tgt_llog_close(struct tgt_session_info *tsi);
+int tgt_llog_destroy(struct tgt_session_info *tsi);
+int tgt_llog_read_header(struct tgt_session_info *tsi);
+int tgt_llog_next_block(struct tgt_session_info *tsi);
+int tgt_llog_prev_block(struct tgt_session_info *tsi);
+int tgt_sec_ctx_init(struct tgt_session_info *tsi);
+int tgt_sec_ctx_init_cont(struct tgt_session_info *tsi);
+int tgt_sec_ctx_fini(struct tgt_session_info *tsi);
+
+extern struct tgt_handler tgt_sec_ctx_handlers[];
+extern struct tgt_handler tgt_obd_handlers[];
+extern struct tgt_handler tgt_dlm_handlers[];
+extern struct tgt_handler tgt_llog_handlers[];
+extern struct tgt_handler tgt_out_handlers[];
+extern struct tgt_handler fld_handlers[];
+extern struct tgt_handler seq_handlers[];
+
+typedef void (*tgt_cb_t)(struct lu_target *lut, __u64 transno,
+ void *data, int err);
+struct tgt_commit_cb {
+ tgt_cb_t tgt_cb_func;
+ void *tgt_cb_data;
+};
+
+/* target/tgt_main.c */
+void tgt_boot_epoch_update(struct lu_target *lut);
+int tgt_last_commit_cb_add(struct thandle *th, struct lu_target *lut,
+ struct obd_export *exp, __u64 transno);
+int tgt_new_client_cb_add(struct thandle *th, struct obd_export *exp);
+int tgt_init(const struct lu_env *env, struct lu_target *lut,
+ struct obd_device *obd, struct dt_device *dt,
+ struct tgt_opc_slice *slice,
+ int request_fail_id, int reply_fail_id);
+void tgt_fini(const struct lu_env *env, struct lu_target *lut);
+int tgt_client_alloc(struct obd_export *exp);
+void tgt_client_free(struct obd_export *exp);
+int tgt_client_del(const struct lu_env *env, struct obd_export *exp);
+int tgt_client_add(const struct lu_env *env, struct obd_export *exp, int);
+int tgt_client_new(const struct lu_env *env, struct obd_export *exp);
+int tgt_client_data_read(const struct lu_env *env, struct lu_target *tg,
+ struct lsd_client_data *lcd, loff_t *off, int index);
+int tgt_client_data_write(const struct lu_env *env, struct lu_target *tg,
+ struct lsd_client_data *lcd, loff_t *off, struct thandle *th);
+int tgt_server_data_read(const struct lu_env *env, struct lu_target *tg);
+int tgt_server_data_write(const struct lu_env *env, struct lu_target *tg,
+ struct thandle *th);
+int tgt_server_data_update(const struct lu_env *env, struct lu_target *tg,
+ int sync);
+int tgt_truncate_last_rcvd(const struct lu_env *env, struct lu_target *tg,
+ loff_t off);
+int tgt_last_rcvd_update(const struct lu_env *env, struct lu_target *tgt,
+ struct dt_object *obj, __u64 opdata,
+ struct thandle *th, struct ptlrpc_request *req);
+
+enum {
+ ESERIOUS = 0x0001000
+};
+
+static inline int err_serious(int rc)
+{
+ LASSERT(rc < 0);
+ return -(-rc | ESERIOUS);
+}
+
+static inline int clear_serious(int rc)
+{
+ if (rc < 0)
+ rc = -(-rc & ~ESERIOUS);
+ return rc;
+}
+
+static inline int is_serious(int rc)
+{
+ return (rc < 0 && -rc & ESERIOUS);
+}
+
+/*
+ * Unified target generic handers macros and generic functions.
+ */
+#define TGT_RPC_HANDLER(base, flags, opc, fn, fmt, version) \
+[opc - base] = { \
+ .th_name = #opc, \
+ .th_fail_id = OBD_FAIL_ ## opc ## _NET, \
+ .th_opc = opc, \
+ .th_flags = flags, \
+ .th_act = fn, \
+ .th_fmt = fmt, \
+ .th_version = version \
+}
+
+/* MDT Request with a format known in advance */
+#define TGT_MDT_HDL(flags, name, fn) \
+ TGT_RPC_HANDLER(MDS_FIRST_OPC, flags, name, fn, &RQF_ ## name, \
+ LUSTRE_MDS_VERSION)
+/* Request with a format we do not yet know */
+#define TGT_MDT_HDL_VAR(flags, name, fn) \
+ TGT_RPC_HANDLER(MDS_FIRST_OPC, flags, name, fn, NULL, \
+ LUSTRE_MDS_VERSION)
+
+/* MGS request with a format known in advance */
+#define TGT_MGS_HDL(flags, name, fn) \
+ TGT_RPC_HANDLER(MGS_FIRST_OPC, flags, name, fn, &RQF_ ## name, \
+ LUSTRE_MGS_VERSION)
+#define TGT_MGS_HDL_VAR(flags, name, fn) \
+ TGT_RPC_HANDLER(MGS_FIRST_OPC, flags, name, fn, NULL, \
+ LUSTRE_MGS_VERSION)
+
+/*
+ * OBD handler macros and generic functions.
+ */
+#define TGT_OBD_HDL(flags, name, fn) \
+ TGT_RPC_HANDLER(OBD_FIRST_OPC, flags, name, fn, &RQF_ ## name, \
+ LUSTRE_OBD_VERSION)
+#define TGT_OBD_HDL_VAR(flags, name, fn) \
+ TGT_RPC_HANDLER(OBD_FIRST_OPC, flags, name, fn, NULL, \
+ LUSTRE_OBD_VERSION)
+
+/*
+ * DLM handler macros and generic functions.
+ */
+#define TGT_DLM_HDL_VAR(flags, name, fn) \
+ TGT_RPC_HANDLER(LDLM_FIRST_OPC, flags, name, fn, NULL, \
+ LUSTRE_DLM_VERSION)
+#define TGT_DLM_HDL(flags, name, fn) \
+ TGT_RPC_HANDLER(LDLM_FIRST_OPC, flags, name, fn, &RQF_ ## name, \
+ LUSTRE_DLM_VERSION)
+
+/*
+ * LLOG handler macros and generic functions.
+ */
+#define TGT_LLOG_HDL_VAR(flags, name, fn) \
+ TGT_RPC_HANDLER(LLOG_FIRST_OPC, flags, name, fn, NULL, \
+ LUSTRE_LOG_VERSION)
+#define TGT_LLOG_HDL(flags, name, fn) \
+ TGT_RPC_HANDLER(LLOG_FIRST_OPC, flags, name, fn, &RQF_ ## name, \
+ LUSTRE_LOG_VERSION)
+
+/*
+ * Sec context handler macros and generic functions.
+ */
+#define TGT_SEC_HDL_VAR(flags, name, fn) \
+ TGT_RPC_HANDLER(SEC_FIRST_OPC, flags, name, fn, NULL, \
+ LUSTRE_OBD_VERSION)
+
+#define TGT_QUOTA_HDL(flags, name, fn) \
+ TGT_RPC_HANDLER(QUOTA_DQACQ, flags, name, fn, &RQF_ ## name, \
+ LUSTRE_MDS_VERSION)
+
+/* Sequence service handlers */
+#define TGT_SEQ_HDL(flags, name, fn) \
+ TGT_RPC_HANDLER(SEQ_QUERY, flags, name, fn, &RQF_ ## name, \
+ LUSTRE_MDS_VERSION)
+
+/* FID Location Database handlers */
+#define TGT_FLD_HDL(flags, name, fn) \
+ TGT_RPC_HANDLER(FLD_QUERY, flags, name, fn, &RQF_ ## name, \
+ LUSTRE_MDS_VERSION)
+
+/* Request with a format known in advance */
+#define TGT_UPDATE_HDL(flags, name, fn) \
+ TGT_RPC_HANDLER(UPDATE_OBJ, flags, name, fn, &RQF_ ## name, \
+ LUSTRE_MDS_VERSION)
+