Fix: rotation may never complete in per-PID buffering mode
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
index e88ad0d0de4b3439f88d417ad58e82f58b9c99f3..0d860236e201551a8389969359e85b1caf133eaa 100644 (file)
@@ -2701,7 +2701,7 @@ int cmd_start_trace(struct ltt_session *session)
        session->rotated_after_last_stop = false;
 
        if (session->rotate_timer_period) {
-               ret = sessiond_rotate_timer_start(session,
+               ret = timer_session_rotation_schedule_timer_start(session,
                                session->rotate_timer_period);
                if (ret < 0) {
                        ERR("Failed to enable rotate timer");
@@ -2735,9 +2735,9 @@ int rename_active_chunk(struct ltt_session *session)
                goto end;
        }
 
-       ret = rename_complete_chunk(session, time(NULL));
+       ret = rename_completed_chunk(session, time(NULL));
        if (ret < 0) {
-               ERR("Failed to rename current rotate path");
+               ERR("Failed to rename current rotation's path");
                goto end;
        }
 
@@ -2782,15 +2782,23 @@ int cmd_stop_trace(struct ltt_session *session)
                goto error;
        }
 
-       if (session->rotate_relay_pending_timer_enabled) {
-               sessiond_timer_rotate_pending_stop(session);
+       if (session->rotation_pending_check_timer_enabled) {
+               if (timer_session_rotation_pending_check_stop(session)) {
+                       ERR("Failed to stop the \"rotation pending check\" timer of session %s",
+                                       session->name);
+               }
        }
 
-       if (session->rotate_timer_enabled) {
-               sessiond_rotate_timer_stop(session);
+       if (session->rotation_schedule_timer_enabled) {
+               if (timer_session_rotation_schedule_timer_stop(
+                               session)) {
+                       ERR("Failed to stop the \"rotation schedule\" timer of session %s",
+                                       session->name);
+               }
        }
 
-       if (session->current_archive_id > 0 && !session->rotate_pending) {
+       if (session->current_archive_id > 0 &&
+                       session->rotation_state != LTTNG_ROTATION_STATE_ONGOING) {
                ret = rename_active_chunk(session);
                if (ret) {
                        /*
@@ -3089,12 +3097,19 @@ int cmd_destroy_session(struct ltt_session *session, int wpipe,
 
        DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, session->id);
 
-       if (session->rotate_relay_pending_timer_enabled) {
-               sessiond_timer_rotate_pending_stop(session);
+       if (session->rotation_pending_check_timer_enabled) {
+               if (timer_session_rotation_pending_check_stop(session)) {
+                       ERR("Failed to stop the \"rotation pending check\" timer of session %s",
+                                       session->name);
+               }
        }
 
-       if (session->rotate_timer_enabled) {
-               sessiond_rotate_timer_stop(session);
+       if (session->rotation_schedule_timer_enabled) {
+               if (timer_session_rotation_schedule_timer_stop(
+                               session)) {
+                       ERR("Failed to stop the \"rotation schedule\" timer of session %s",
+                                       session->name);
+               }
        }
 
        if (session->rotate_size) {
@@ -3564,10 +3579,8 @@ int cmd_data_pending(struct ltt_session *session)
                }
        }
 
-       /*
-        * A rotation is still pending, we have to wait.
-        */
-       if (session->rotate_pending) {
+       /* A rotation is still pending, we have to wait. */
+       if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
                DBG("Rotate still pending for session %s", session->name);
                ret = 1;
                goto error;
@@ -4561,7 +4574,6 @@ int cmd_rotate_session(struct ltt_session *session,
        struct tm *timeinfo;
        char datetime[21];
        time_t now;
-       bool ust_active = false;
 
        assert(session);
 
@@ -4586,9 +4598,10 @@ int cmd_rotate_session(struct ltt_session *session,
                goto end;
        }
 
-       if (session->rotate_pending || session->rotate_pending_relay) {
+       if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
                ret = -LTTNG_ERR_ROTATION_PENDING;
-               DBG("Rotate already in progress");
+               DBG("Refusing to launch a rotation; a rotation is already in progress for session %s",
+                               session->name);
                goto end;
        }
 
@@ -4607,15 +4620,11 @@ int cmd_rotate_session(struct ltt_session *session,
        if (session->current_archive_id == 0) {
                const char *base_path = NULL;
 
+               assert(session->kernel_session || session->ust_session);
                /* Either one of the two sessions is enough to get the root path. */
-               if (session->kernel_session) {
-                       base_path = session_get_base_path(session);
-               } else if (session->ust_session) {
-                       base_path = session_get_base_path(session);
-               } else {
-                       assert(0);
-               }
+               base_path = session_get_base_path(session);
                assert(base_path);
+
                ret = lttng_strncpy(session->rotation_chunk.current_rotate_path,
                                base_path,
                                sizeof(session->rotation_chunk.current_rotate_path));
@@ -4640,21 +4649,29 @@ int cmd_rotate_session(struct ltt_session *session,
        }
        DBG("Current rotate path %s", session->rotation_chunk.current_rotate_path);
 
+       /*
+        * Channels created after this point will belong to the next
+        * archive id.
+        */
        session->current_archive_id++;
-       session->rotate_pending = true;
+       /*
+        * A rotation has a local step even if the destination is a relay
+        * daemon; the buffers must be consumed by the consumer daemon.
+        */
+       session->rotation_pending_local = true;
+       session->rotation_pending_relay =
+               session_get_consumer_destination_type(session) == CONSUMER_DST_NET;
        session->rotation_state = LTTNG_ROTATION_STATE_ONGOING;
        ret = notification_thread_command_session_rotation_ongoing(
                        notification_thread_handle,
                        session->name, session->uid, session->gid,
-                       session->current_archive_id);
+                       session->current_archive_id - 1);
        if (ret != LTTNG_OK) {
                ERR("Failed to notify notification thread that a session rotation is ongoing for session %s",
                                session->name);
        }
 
-       /*
-        * Create the path name for the next chunk.
-        */
+       /* Create the path name for the next chunk. */
        now = time(NULL);
        if (now == (time_t) -1) {
                ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE;
@@ -4752,41 +4769,16 @@ int cmd_rotate_session(struct ltt_session *session,
                        ret = -LTTNG_ERR_CREATE_DIR_FAIL;
                        goto end;
                }
-               ret = ust_app_rotate_session(session, &ust_active);
+               ret = ust_app_rotate_session(session);
                if (ret != LTTNG_OK) {
                        goto end;
                }
-               /*
-                * Handle the case where we did not start a rotation on any channel.
-                * The consumer will never wake up the rotation thread to perform the
-                * rename, so we have to do it here while we hold the session and
-                * session_list locks.
-                */
-               if (!session->kernel_session && !ust_active) {
-                       struct lttng_trace_archive_location *location;
-
-                       session->rotate_pending = false;
-                       session->rotation_state = LTTNG_ROTATION_STATE_COMPLETED;
-                       ret = rename_complete_chunk(session, now);
-                       if (ret < 0) {
-                               ERR("Failed to rename completed rotation chunk");
-                               goto end;
-                       }
+       }
 
-                       /* Ownership of location is transferred. */
-                       location = session_get_trace_archive_location(session);
-                       ret = notification_thread_command_session_rotation_completed(
-                                       notification_thread_handle,
-                                       session->name,
-                                       session->uid,
-                                       session->gid,
-                                       session->current_archive_id,
-                                       location);
-                       if (ret != LTTNG_OK) {
-                               ERR("Failed to notify notification thread that rotation is complete for session %s",
-                                               session->name);
-                       }
-               }
+       ret = timer_session_rotation_pending_check_start(session,
+                       DEFAULT_ROTATE_PENDING_TIMER);
+       if (ret) {
+               goto end;
        }
 
        if (!session->active) {
@@ -4797,8 +4789,8 @@ int cmd_rotate_session(struct ltt_session *session,
                rotate_return->rotation_id = session->current_archive_id;
        }
 
-       DBG("Cmd rotate session %s, current_archive_id %" PRIu64 " sent",
-                       session->name, session->current_archive_id);
+       DBG("Cmd rotate session %s, archive_id %" PRIu64 " sent",
+                       session->name, session->current_archive_id - 1);
        ret = LTTNG_OK;
 
 end:
@@ -4999,14 +4991,16 @@ int cmd_rotation_set_schedule(struct ltt_session *session,
                         * Only start the timer if the session is active,
                         * otherwise it will be started when the session starts.
                         */
-                       ret = sessiond_rotate_timer_start(session, new_value);
+                       ret = timer_session_rotation_schedule_timer_start(
+                                       session, new_value);
                        if (ret) {
                                ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command");
                                ret = LTTNG_ERR_UNK;
                                goto end;
                        }
                } else {
-                       ret = sessiond_rotate_timer_stop(session);
+                       ret = timer_session_rotation_schedule_timer_stop(
+                                       session);
                        if (ret) {
                                ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command");
                                ret = LTTNG_ERR_UNK;
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