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LU-3534 osp: move RPC pack from declare to execution phase
[fs/lustre-release.git] / lustre / osp / osp_trans.c
index d00dbe7..740270d 100644 (file)
  * will be called one by one to handle each own result.
  *
  *
+ * There are three kinds of transactions
+ *
+ * 1. Local transaction, all of updates of the transaction are in the local MDT.
+ * 2. Remote transaction, all of updates of the transaction are in one remote
+ * MDT, which only happens in LFSCK now.
+ * 3. Distribute transaction, updates for the transaction are in mulitple MDTs.
+ *
  * Author: Di Wang <di.wang@intel.com>
  * Author: Fan, Yong <fan.yong@intel.com>
  */
 
 #include "osp_internal.h"
 
-struct osp_async_update_args {
+/**
+ * The argument for the interpreter callback of osp request.
+ */
+struct osp_update_args {
        struct dt_update_request *oaua_update;
        atomic_t                 *oaua_count;
        wait_queue_head_t        *oaua_waitq;
        bool                      oaua_flow_control;
 };
 
-struct osp_async_request {
+/**
+ * Call back for each update request.
+ */
+struct osp_update_callback {
        /* list in the dt_update_request::dur_cb_items */
-       struct list_head                 oar_list;
+       struct list_head                 ouc_list;
 
        /* The target of the async update request. */
-       struct osp_object               *oar_obj;
+       struct osp_object               *ouc_obj;
 
-       /* The data used by oar_interpreter. */
-       void                            *oar_data;
+       /* The data used by or_interpreter. */
+       void                            *ouc_data;
 
        /* The interpreter function called after the async request handled. */
-       osp_async_request_interpreter_t  oar_interpreter;
+       osp_update_interpreter_t        ouc_interpreter;
 };
 
+static struct object_update_request *object_update_request_alloc(size_t size)
+{
+       struct object_update_request *ourq;
+
+       OBD_ALLOC_LARGE(ourq, size);
+       if (ourq == NULL)
+               return ERR_PTR(-ENOMEM);
+
+       ourq->ourq_magic = UPDATE_REQUEST_MAGIC;
+       ourq->ourq_count = 0;
+
+       return ourq;
+}
+
+static void object_update_request_free(struct object_update_request *ourq,
+                                      size_t ourq_size)
+{
+       if (ourq != NULL)
+               OBD_FREE_LARGE(ourq, ourq_size);
+}
+
+/**
+ * Allocate and initialize dt_update_request
+ *
+ * dt_update_request is being used to track updates being executed on
+ * this dt_device(OSD or OSP). The update buffer will be 4k initially,
+ * and increased if needed.
+ *
+ * \param [in] dt      dt device
+ *
+ * \retval             dt_update_request being allocated if succeed
+ * \retval             ERR_PTR(errno) if failed
+ */
+struct dt_update_request *dt_update_request_create(struct dt_device *dt)
+{
+       struct dt_update_request *dt_update;
+       struct object_update_request *ourq;
+
+       OBD_ALLOC_PTR(dt_update);
+       if (dt_update == NULL)
+               return ERR_PTR(-ENOMEM);
+
+       ourq = object_update_request_alloc(OUT_UPDATE_INIT_BUFFER_SIZE);
+       if (IS_ERR(ourq)) {
+               OBD_FREE_PTR(dt_update);
+               return ERR_CAST(ourq);
+       }
+
+       dt_update->dur_buf.ub_req = ourq;
+       dt_update->dur_buf.ub_req_size = OUT_UPDATE_INIT_BUFFER_SIZE;
+
+       dt_update->dur_dt = dt;
+       dt_update->dur_batchid = 0;
+       INIT_LIST_HEAD(&dt_update->dur_cb_items);
+
+       return dt_update;
+}
+
+/**
+ * Destroy dt_update_request
+ *
+ * \param [in] dt_update       dt_update_request being destroyed
+ */
+void dt_update_request_destroy(struct dt_update_request *dt_update)
+{
+       if (dt_update == NULL)
+               return;
+
+       object_update_request_free(dt_update->dur_buf.ub_req,
+                                  dt_update->dur_buf.ub_req_size);
+       OBD_FREE_PTR(dt_update);
+}
+
 /**
- * Allocate an asynchronous request and initialize it with the given parameters.
+ * Allocate an osp request and initialize it with the given parameters.
  *
  * \param[in] obj              pointer to the operation target
  * \param[in] data             pointer to the data used by the interpreter
@@ -92,38 +178,38 @@ struct osp_async_request {
  * \retval                     pointer to the asychronous request
  * \retval                     NULL if the allocation failed
  */
-static struct osp_async_request *
-osp_async_request_init(struct osp_object *obj, void *data,
-                      osp_async_request_interpreter_t interpreter)
+static struct osp_update_callback *
+osp_update_callback_init(struct osp_object *obj, void *data,
+                        osp_update_interpreter_t interpreter)
 {
-       struct osp_async_request *oar;
+       struct osp_update_callback *ouc;
 
-       OBD_ALLOC_PTR(oar);
-       if (oar == NULL)
+       OBD_ALLOC_PTR(ouc);
+       if (ouc == NULL)
                return NULL;
 
        lu_object_get(osp2lu_obj(obj));
-       INIT_LIST_HEAD(&oar->oar_list);
-       oar->oar_obj = obj;
-       oar->oar_data = data;
-       oar->oar_interpreter = interpreter;
+       INIT_LIST_HEAD(&ouc->ouc_list);
+       ouc->ouc_obj = obj;
+       ouc->ouc_data = data;
+       ouc->ouc_interpreter = interpreter;
 
-       return oar;
+       return ouc;
 }
 
 /**
- * Destroy the asychronous request.
+ * Destroy the osp_update_callback.
  *
  * \param[in] env      pointer to the thread context
- * \param[in] oar      pointer to asychronous request
+ * \param[in] ouc      pointer to osp_update_callback
  */
-static void osp_async_request_fini(const struct lu_env *env,
-                                  struct osp_async_request *oar)
+static void osp_update_callback_fini(const struct lu_env *env,
+                                    struct osp_update_callback *ouc)
 {
-       LASSERT(list_empty(&oar->oar_list));
+       LASSERT(list_empty(&ouc->ouc_list));
 
-       lu_object_put(env, osp2lu_obj(oar->oar_obj));
-       OBD_FREE_PTR(oar);
+       lu_object_put(env, osp2lu_obj(ouc->ouc_obj));
+       OBD_FREE_PTR(ouc);
 }
 
 /**
@@ -140,15 +226,14 @@ static void osp_async_request_fini(const struct lu_env *env,
  * \retval             0 for success
  * \retval             negative error number on failure
  */
-static int osp_async_update_interpret(const struct lu_env *env,
-                                     struct ptlrpc_request *req,
-                                     void *arg, int rc)
+static int osp_update_interpret(const struct lu_env *env,
+                               struct ptlrpc_request *req, void *arg, int rc)
 {
        struct object_update_reply      *reply  = NULL;
-       struct osp_async_update_args    *oaua   = arg;
+       struct osp_update_args          *oaua   = arg;
        struct dt_update_request        *dt_update = oaua->oaua_update;
-       struct osp_async_request        *oar;
-       struct osp_async_request        *next;
+       struct osp_update_callback      *ouc;
+       struct osp_update_callback      *next;
        int                              count  = 0;
        int                              index  = 0;
        int                              rc1    = 0;
@@ -170,9 +255,9 @@ static int osp_async_update_interpret(const struct lu_env *env,
                rc1 = rc;
        }
 
-       list_for_each_entry_safe(oar, next, &dt_update->dur_cb_items,
-                                oar_list) {
-               list_del_init(&oar->oar_list);
+       list_for_each_entry_safe(ouc, next, &dt_update->dur_cb_items,
+                                ouc_list) {
+               list_del_init(&ouc->ouc_list);
 
                /* The peer may only have handled some requests (indicated
                 * by the 'count') in the packaged OUT RPC, we can only get
@@ -191,9 +276,11 @@ static int osp_async_update_interpret(const struct lu_env *env,
                                rc1 = -EINVAL;
                }
 
-               oar->oar_interpreter(env, reply, req, oar->oar_obj,
-                                      oar->oar_data, index, rc1);
-               osp_async_request_fini(env, oar);
+               if (ouc->ouc_interpreter != NULL)
+                       ouc->ouc_interpreter(env, reply, req, ouc->ouc_obj,
+                                            ouc->ouc_data, index, rc1);
+
+               osp_update_callback_fini(env, ouc);
                index++;
        }
 
@@ -220,33 +307,33 @@ int osp_unplug_async_request(const struct lu_env *env,
                             struct osp_device *osp,
                             struct dt_update_request *update)
 {
-       struct osp_async_update_args    *args;
-       struct ptlrpc_request           *req = NULL;
-       int                              rc;
+       struct osp_update_args  *args;
+       struct ptlrpc_request   *req = NULL;
+       int                      rc;
 
        rc = osp_prep_update_req(env, osp->opd_obd->u.cli.cl_import,
                                 update->dur_buf.ub_req, &req);
        if (rc != 0) {
-               struct osp_async_request *oar;
-               struct osp_async_request *next;
-
-               list_for_each_entry_safe(oar, next,
-                                        &update->dur_cb_items, oar_list) {
-                       list_del_init(&oar->oar_list);
-                       oar->oar_interpreter(env, NULL, NULL, oar->oar_obj,
-                                              oar->oar_data, 0, rc);
-                       osp_async_request_fini(env, oar);
+               struct osp_update_callback *ouc;
+               struct osp_update_callback *next;
+
+               list_for_each_entry_safe(ouc, next,
+                                        &update->dur_cb_items, ouc_list) {
+                       list_del_init(&ouc->ouc_list);
+                       if (ouc->ouc_interpreter != NULL)
+                               ouc->ouc_interpreter(env, NULL, NULL,
+                                                    ouc->ouc_obj,
+                                                    ouc->ouc_data, 0, rc);
+                       osp_update_callback_fini(env, ouc);
                }
                dt_update_request_destroy(update);
        } else {
-               LASSERT(list_empty(&update->dur_list));
-
                args = ptlrpc_req_async_args(req);
                args->oaua_update = update;
                args->oaua_count = NULL;
                args->oaua_waitq = NULL;
                args->oaua_flow_control = false;
-               req->rq_interpret_reply = osp_async_update_interpret;
+               req->rq_interpret_reply = osp_update_interpret;
                ptlrpcd_add_req(req, PDL_POLICY_LOCAL, -1);
        }
 
@@ -281,6 +368,37 @@ osp_find_or_create_async_update_request(struct osp_device *osp)
 }
 
 /**
+ * Insert an osp_update_callback into the dt_update_request.
+ *
+ * Insert an osp_update_callback to the dt_update_request. Usually each update
+ * in the dt_update_request will have one correspondent callback, and these
+ * callbacks will be called in rq_interpret_reply.
+ *
+ * \param[in] env              pointer to the thread context
+ * \param[in] obj              pointer to the operation target object
+ * \param[in] data             pointer to the data used by the interpreter
+ * \param[in] interpreter      pointer to the interpreter function
+ *
+ * \retval                     0 for success
+ * \retval                     negative error number on failure
+ */
+int osp_insert_update_callback(const struct lu_env *env,
+                              struct dt_update_request *update,
+                              struct osp_object *obj, void *data,
+                              osp_update_interpreter_t interpreter)
+{
+       struct osp_update_callback  *ouc;
+
+       ouc = osp_update_callback_init(obj, data, interpreter);
+       if (ouc == NULL)
+               RETURN(-ENOMEM);
+
+       list_add_tail(&ouc->ouc_list, &update->dur_cb_items);
+
+       return 0;
+}
+
+/**
  * Insert an asynchronous idempotent request to the shared request queue that
  * is attached to the osp_device.
  *
@@ -307,21 +425,16 @@ osp_find_or_create_async_update_request(struct osp_device *osp)
 int osp_insert_async_request(const struct lu_env *env, enum update_type op,
                             struct osp_object *obj, int count,
                             __u16 *lens, const void **bufs, void *data,
-                            osp_async_request_interpreter_t interpreter)
+                            osp_update_interpreter_t interpreter)
 {
-       struct osp_async_request     *oar;
        struct osp_device            *osp = lu2osp_dev(osp2lu_obj(obj)->lo_dev);
        struct dt_update_request     *update;
        int                           rc  = 0;
        ENTRY;
 
-       oar = osp_async_request_init(obj, data, interpreter);
-       if (oar == NULL)
-               RETURN(-ENOMEM);
-
        update = osp_find_or_create_async_update_request(osp);
        if (IS_ERR(update))
-               GOTO(out, rc = PTR_ERR(update));
+               RETURN(PTR_ERR(update));
 
 again:
        /* The queue is full. */
@@ -335,27 +448,37 @@ again:
                rc = osp_unplug_async_request(env, osp, update);
                mutex_lock(&osp->opd_async_requests_mutex);
                if (rc != 0)
-                       GOTO(out, rc);
+                       RETURN(rc);
 
                update = osp_find_or_create_async_update_request(osp);
                if (IS_ERR(update))
-                       GOTO(out, rc = PTR_ERR(update));
+                       RETURN(PTR_ERR(update));
 
                goto again;
        }
 
-       if (rc == 0)
-               list_add_tail(&oar->oar_list, &update->dur_cb_items);
+       rc = osp_insert_update_callback(env, update, obj, data, interpreter);
+
+       RETURN(rc);
+}
+
+int osp_trans_update_request_create(struct thandle *th)
+{
+       struct osp_thandle              *oth = thandle_to_osp_thandle(th);
+       struct dt_update_request        *update;
 
-       GOTO(out, rc);
+       if (oth->ot_dur != NULL)
+               return 0;
 
-out:
-       if (rc != 0)
-               osp_async_request_fini(env, oar);
+       update = dt_update_request_create(th->th_dev);
+       if (IS_ERR(update)) {
+               th->th_result = PTR_ERR(update);
+               return PTR_ERR(update);
+       }
 
-       return rc;
+       oth->ot_dur = update;
+       return 0;
 }
-
 /**
  * The OSP layer dt_device_operations::dt_trans_create() interface
  * to create a transaction.
@@ -385,37 +508,19 @@ out:
  */
 struct thandle *osp_trans_create(const struct lu_env *env, struct dt_device *d)
 {
-       struct thandle          *th = NULL;
-       struct thandle_update   *tu = NULL;
-       int                      rc = 0;
+       struct osp_thandle              *oth;
+       struct thandle                  *th = NULL;
+       ENTRY;
 
-       OBD_ALLOC_PTR(th);
-       if (unlikely(th == NULL))
-               GOTO(out, rc = -ENOMEM);
+       OBD_ALLOC_PTR(oth);
+       if (unlikely(oth == NULL))
+               RETURN(ERR_PTR(-ENOMEM));
 
+       th = &oth->ot_super;
        th->th_dev = d;
        th->th_tags = LCT_TX_HANDLE;
-       atomic_set(&th->th_refc, 1);
-       th->th_alloc_size = sizeof(*th);
-
-       OBD_ALLOC_PTR(tu);
-       if (tu == NULL)
-               GOTO(out, rc = -ENOMEM);
-
-       INIT_LIST_HEAD(&tu->tu_remote_update_list);
-       tu->tu_only_remote_trans = 1;
-       th->th_update = tu;
-
-out:
-       if (rc != 0) {
-               if (tu != NULL)
-                       OBD_FREE_PTR(tu);
-               if (th != NULL)
-                       OBD_FREE_PTR(th);
-               th = ERR_PTR(rc);
-       }
 
-       return th;
+       RETURN(th);
 }
 
 /**
@@ -485,7 +590,7 @@ int osp_prep_update_req(const struct lu_env *env, struct obd_import *imp,
  */
 int osp_remote_sync(const struct lu_env *env, struct osp_device *osp,
                    struct dt_update_request *dt_update,
-                   struct ptlrpc_request **reqp, bool rpc_lock)
+                   struct ptlrpc_request **reqp)
 {
        struct obd_import       *imp = osp->opd_obd->u.cli.cl_import;
        struct ptlrpc_request   *req = NULL;
@@ -498,11 +603,7 @@ int osp_remote_sync(const struct lu_env *env, struct osp_device *osp,
 
        /* Note: some dt index api might return non-zero result here, like
         * osd_index_ea_lookup, so we should only check rc < 0 here */
-       if (rpc_lock)
-               osp_get_rpc_lock(osp);
        rc = ptlrpc_queue_wait(req);
-       if (rpc_lock)
-               osp_put_rpc_lock(osp);
        if (rc < 0) {
                ptlrpc_req_finished(req);
                dt_update->dur_rc = rc;
@@ -524,9 +625,8 @@ int osp_remote_sync(const struct lu_env *env, struct osp_device *osp,
 /**
  * Trigger the request for remote updates.
  *
- * If the transaction is not a remote one or it is required to be sync mode
- * (th->th_sync is set), then it will be sent synchronously; otherwise, the
- * RPC will be sent asynchronously.
+ * If th_sync is set, then the request will be sent synchronously,
+ * otherwise, the RPC will be sent asynchronously.
  *
  * Please refer to osp_trans_create() for transaction type.
  *
@@ -534,78 +634,107 @@ int osp_remote_sync(const struct lu_env *env, struct osp_device *osp,
  * \param[in] osp              pointer to the OSP device
  * \param[in] dt_update                pointer to the dt_update_request
  * \param[in] th               pointer to the transaction handler
- * \param[in] flow_control     whether need to control the flow
+ * \param[out] sent            whether the RPC has been sent
  *
  * \retval                     0 for success
  * \retval                     negative error number on failure
  */
 static int osp_trans_trigger(const struct lu_env *env, struct osp_device *osp,
                             struct dt_update_request *dt_update,
-                            struct thandle *th, bool flow_control)
+                            struct thandle *th, int *sent)
 {
-       struct thandle_update   *tu = th->th_update;
-       int                      rc = 0;
-
-       LASSERT(tu != NULL);
-
-       if (is_only_remote_trans(th)) {
-               struct osp_async_update_args    *args;
-               struct ptlrpc_request           *req;
+       struct osp_update_args  *args;
+       struct ptlrpc_request   *req;
+       int     rc = 0;
+       ENTRY;
 
-               list_del_init(&dt_update->dur_list);
-               if (th->th_sync) {
-                       rc = osp_remote_sync(env, osp, dt_update, NULL, true);
-                       dt_update_request_destroy(dt_update);
+       rc = osp_prep_update_req(env, osp->opd_obd->u.cli.cl_import,
+                                dt_update->dur_buf.ub_req, &req);
+       if (rc != 0)
+               RETURN(rc);
 
-                       return rc;
-               }
+       *sent = 1;
+       req->rq_interpret_reply = osp_update_interpret;
+       args = ptlrpc_req_async_args(req);
+       args->oaua_update = dt_update;
+       if (is_only_remote_trans(th) && !th->th_sync) {
+               args->oaua_flow_control = true;
 
-               rc = osp_prep_update_req(env, osp->opd_obd->u.cli.cl_import,
-                                        dt_update->dur_buf.ub_req, &req);
-               if (rc == 0) {
+               if (!osp->opd_connect_mdt) {
                        down_read(&osp->opd_async_updates_rwsem);
-
-                       args = ptlrpc_req_async_args(req);
-                       args->oaua_update = dt_update;
                        args->oaua_count = &osp->opd_async_updates_count;
                        args->oaua_waitq = &osp->opd_syn_barrier_waitq;
-                       args->oaua_flow_control = flow_control;
-                       req->rq_interpret_reply =
-                               osp_async_update_interpret;
-
-                       atomic_inc(args->oaua_count);
                        up_read(&osp->opd_async_updates_rwsem);
-
-                       ptlrpcd_add_req(req, PDL_POLICY_LOCAL, -1);
-               } else {
-                       dt_update_request_destroy(dt_update);
+                       atomic_inc(args->oaua_count);
                }
+
+               ptlrpcd_add_req(req, PDL_POLICY_LOCAL, -1);
        } else {
-               th->th_sync = 1;
-               rc = osp_remote_sync(env, osp, dt_update, NULL, true);
+               osp_get_rpc_lock(osp);
+               args->oaua_flow_control = false;
+               rc = ptlrpc_queue_wait(req);
+               osp_put_rpc_lock(osp);
+               ptlrpc_req_finished(req);
        }
 
-       return rc;
+       RETURN(rc);
 }
 
 /**
- * The OSP layer dt_device_operations::dt_trans_start() interface
- * to start the transaction.
+ * Get local thandle for osp_thandle
  *
- * If the transaction is a remote transaction, then related remote
- * updates will be triggered in the osp_trans_stop(); otherwise the
- * transaction contains both local and remote update(s), then when
- * the OUT RPC will be triggered depends on the operation, and is
- * indicated by the dt_device::tu_sent_after_local_trans, for example:
+ * Get the local OSD thandle from the OSP thandle. Currently, there
+ * are a few OSP API (osp_object_create() and osp_sync_add()) needs
+ * to update the object on local OSD device.
+ *
+ * If the osp_thandle comes from normal stack (MDD->LOD->OSP), then
+ * we will get local thandle by thandle_get_sub_by_dt.
+ *
+ * If the osp_thandle is remote thandle (th_top == NULL, only used
+ * by LFSCK), then it will create a local thandle, and stop it in
+ * osp_trans_stop(). And this only happens on OSP for OST.
  *
- * 1) If it is remote create, it will send the remote req after local
- * transaction. i.e. create the object locally first, then insert the
- * remote name entry.
+ * These are temporary solution, once OSP accessing OSD object is
+ * being fixed properly, this function should be removed. XXX
  *
- * 2) If it is remote unlink, it will send the remote req before the
- * local transaction, i.e. delete the name entry remotely first, then
- * destroy the local object.
+ * \param[in] env              pointer to the thread context
+ * \param[in] th               pointer to the transaction handler
+ * \param[in] dt               pointer to the OSP device
+ *
+ * \retval                     pointer to the local thandle
+ * \retval                     ERR_PTR(errno) if it fails.
+ **/
+struct thandle *osp_get_storage_thandle(const struct lu_env *env,
+                                       struct thandle *th,
+                                       struct osp_device *osp)
+{
+       struct osp_thandle      *oth;
+       struct thandle          *local_th;
+
+       if (th->th_top != NULL)
+               return thandle_get_sub_by_dt(env, th->th_top,
+                                            osp->opd_storage);
+
+       LASSERT(!osp->opd_connect_mdt);
+       oth = thandle_to_osp_thandle(th);
+       if (oth->ot_storage_th != NULL)
+               return oth->ot_storage_th;
+
+       local_th = dt_trans_create(env, osp->opd_storage);
+       if (IS_ERR(local_th))
+               return local_th;
+
+       oth->ot_storage_th = local_th;
+
+       return local_th;
+}
+
+/**
+ * The OSP layer dt_device_operations::dt_trans_start() interface
+ * to start the transaction.
  *
+ * If the transaction is a remote transaction, then related remote
+ * updates will be triggered in the osp_trans_stop().
  * Please refer to osp_trans_create() for transaction type.
  *
  * \param[in] env              pointer to the thread context
@@ -618,31 +747,20 @@ static int osp_trans_trigger(const struct lu_env *env, struct osp_device *osp,
 int osp_trans_start(const struct lu_env *env, struct dt_device *dt,
                    struct thandle *th)
 {
-       struct thandle_update           *tu = th->th_update;
-       struct dt_update_request        *dt_update;
-       int                              rc = 0;
-
-       if (tu == NULL)
-               return rc;
+       struct osp_thandle      *oth = thandle_to_osp_thandle(th);
 
-       /* Check whether there are updates related with this OSP */
-       dt_update = out_find_update(tu, dt);
-       if (dt_update == NULL)
-               return rc;
-
-       if (!is_only_remote_trans(th) && !tu->tu_sent_after_local_trans)
-               rc = osp_trans_trigger(env, dt2osp_dev(dt), dt_update, th,
-                                      false);
-
-       return rc;
+       /* For remote thandle, if there are local thandle, start it here*/
+       if (is_only_remote_trans(th) && oth->ot_storage_th != NULL)
+               return dt_trans_start(env, oth->ot_storage_th->th_dev,
+                                     oth->ot_storage_th);
+       return 0;
 }
 
 /**
  * The OSP layer dt_device_operations::dt_trans_stop() interface
  * to stop the transaction.
  *
- * If the transaction is a remote transaction, or the update handler
- * is marked as 'tu_sent_after_local_trans', then related remote
+ * If the transaction is a remote transaction, related remote
  * updates will be triggered here via osp_trans_trigger().
  *
  * For synchronous mode update or any failed update, the request
@@ -660,66 +778,76 @@ int osp_trans_start(const struct lu_env *env, struct dt_device *dt,
 int osp_trans_stop(const struct lu_env *env, struct dt_device *dt,
                   struct thandle *th)
 {
-       struct thandle_update           *tu = th->th_update;
-       struct dt_update_request        *dt_update;
-       int                              rc = 0;
+       struct osp_thandle       *oth = thandle_to_osp_thandle(th);
+       struct dt_update_request *dt_update;
+       int                      rc = 0;
+       int                      sent = 0;
        ENTRY;
 
-       LASSERT(tu != NULL);
-       LASSERT(tu != LP_POISON);
+       /* For remote transaction, if there is local storage thandle,
+        * stop it first */
+       if (oth->ot_storage_th != NULL && th->th_top == NULL) {
+               dt_trans_stop(env, oth->ot_storage_th->th_dev,
+                             oth->ot_storage_th);
+               oth->ot_storage_th = NULL;
+       }
 
-       /* Check whether there are updates related with this OSP */
-       dt_update = out_find_update(tu, dt);
-       if (dt_update == NULL) {
-               if (!is_only_remote_trans(th))
-                       RETURN(rc);
+       dt_update = oth->ot_dur;
+       if (dt_update == NULL)
+               GOTO(out, rc);
 
-               GOTO(put, rc);
-       }
+       LASSERT(dt_update != LP_POISON);
 
+       /* If there are no updates, destroy dt_update and thandle */
        if (dt_update->dur_buf.ub_req == NULL ||
            dt_update->dur_buf.ub_req->ourq_count == 0) {
                dt_update_request_destroy(dt_update);
-               GOTO(put, rc);
+               GOTO(out, rc);
        }
 
-       if (is_only_remote_trans(th)) {
-               if (th->th_result == 0) {
-                       struct osp_device *osp = dt2osp_dev(th->th_dev);
-                       struct client_obd *cli = &osp->opd_obd->u.cli;
+       if (is_only_remote_trans(th) && !th->th_sync) {
+               struct osp_device *osp = dt2osp_dev(th->th_dev);
+               struct client_obd *cli = &osp->opd_obd->u.cli;
 
-                       rc = obd_get_request_slot(cli);
-                       if (!osp->opd_imp_active || !osp->opd_imp_connected) {
-                               if (rc == 0)
-                                       obd_put_request_slot(cli);
+               rc = obd_get_request_slot(cli);
+               if (rc != 0)
+                       GOTO(out, rc);
 
-                               rc = -ENOTCONN;
-                       }
+               if (!osp->opd_imp_active || !osp->opd_imp_connected) {
+                       obd_put_request_slot(cli);
+                       GOTO(out, rc = -ENOTCONN);
+               }
 
-                       if (rc != 0) {
-                               dt_update_request_destroy(dt_update);
-                               GOTO(put, rc);
-                       }
+               rc = osp_trans_trigger(env, dt2osp_dev(dt),
+                                      dt_update, th, &sent);
+               if (rc != 0)
+                       obd_put_request_slot(cli);
+       } else {
+               rc = osp_trans_trigger(env, dt2osp_dev(dt), dt_update,
+                                      th, &sent);
+       }
 
-                       rc = osp_trans_trigger(env, dt2osp_dev(dt),
-                                              dt_update, th, true);
-                       if (rc != 0)
-                               obd_put_request_slot(cli);
-               } else {
-                       rc = th->th_result;
-                       dt_update_request_destroy(dt_update);
+out:
+       /* If RPC is triggered successfully, dt_update will be freed in
+        * osp_update_interpreter() */
+       if (rc != 0 && dt_update != NULL && sent == 0) {
+               struct osp_update_callback *ouc;
+               struct osp_update_callback *next;
+
+               list_for_each_entry_safe(ouc, next, &dt_update->dur_cb_items,
+                                ouc_list) {
+                       list_del_init(&ouc->ouc_list);
+                       if (ouc->ouc_interpreter != NULL)
+                               ouc->ouc_interpreter(env, NULL, NULL,
+                                                    ouc->ouc_obj,
+                                                    ouc->ouc_data, 0, rc);
+                       osp_update_callback_fini(env, ouc);
                }
-       } else {
-               if (tu->tu_sent_after_local_trans)
-                       rc = osp_trans_trigger(env, dt2osp_dev(dt),
-                                              dt_update, th, false);
-               rc = dt_update->dur_rc;
+
                dt_update_request_destroy(dt_update);
        }
 
-       GOTO(put, rc);
+       OBD_FREE_PTR(oth);
 
-put:
-       thandle_put(th);
-       return rc;
+       RETURN(rc);
 }