* Ask the consumer to rotate the session output directory.
* The session lock must be held.
*
- * Return LTTNG_OK on success or else a LTTNG_ERR code.
+ * Returns LTTNG_OK on success or else a negative LTTng error code.
*/
int cmd_rotate_session(struct ltt_session *session,
struct lttng_rotate_session_return *rotate_return)
{
int ret;
+ enum lttng_error_code cmd_ret = LTTNG_OK;
size_t strf_ret;
struct tm *timeinfo;
char datetime[21];
time_t now;
+ /*
+ * Used to roll-back timestamps in case of failure to launch the
+ * rotation.
+ */
+ time_t original_last_chunk_start_ts, original_current_chunk_start_ts;
assert(session);
if (!session->has_been_started) {
- ret = -LTTNG_ERR_START_SESSION_ONCE;
+ cmd_ret = LTTNG_ERR_START_SESSION_ONCE;
goto end;
}
if (session->live_timer || session->snapshot_mode ||
!session->output_traces) {
- ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE;
+ cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE;
goto end;
}
if (session->consumer->type == CONSUMER_DST_NET &&
(session->consumer->relay_major_version == 2 &&
session->consumer->relay_minor_version < 11)) {
- ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY;
+ cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY;
goto end;
}
if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
- ret = -LTTNG_ERR_ROTATION_PENDING;
DBG("Refusing to launch a rotation; a rotation is already in progress for session %s",
session->name);
+ cmd_ret = LTTNG_ERR_ROTATION_PENDING;
goto end;
}
if (session->rotated_after_last_stop) {
DBG("Session \"%s\" was already rotated after stop, refusing rotation",
session->name);
- ret = -LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP;
+ cmd_ret = LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP;
goto end;
}
sizeof(session->rotation_chunk.current_rotate_path));
if (ret) {
ERR("Failed to copy session base path to current rotation chunk path");
- ret = -LTTNG_ERR_UNK;
+ cmd_ret = LTTNG_ERR_UNK;
goto end;
}
} else {
sizeof(session->rotation_chunk.current_rotate_path));
if (ret) {
ERR("Failed to copy the active tracing path to the current rotate path");
- ret = -LTTNG_ERR_UNK;
+ cmd_ret = LTTNG_ERR_UNK;
goto end;
}
}
* archive id.
*/
session->current_archive_id++;
- /*
- * 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 - 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. */
now = time(NULL);
if (now == (time_t) -1) {
- ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE;
+ cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE;
goto end;
}
+
+ /* Sample chunk bounds for roll-back in case of error. */
+ original_last_chunk_start_ts = session->last_chunk_start_ts;
+ original_current_chunk_start_ts = session->current_chunk_start_ts;
+
session->last_chunk_start_ts = session->current_chunk_start_ts;
session->current_chunk_start_ts = now;
timeinfo = localtime(&now);
if (!timeinfo) {
PERROR("Failed to sample local time in rotate session command");
- ret = -LTTNG_ERR_UNK;
+ cmd_ret = LTTNG_ERR_UNK;
goto end;
}
strf_ret = strftime(datetime, sizeof(datetime), "%Y%m%dT%H%M%S%z",
timeinfo);
if (!strf_ret) {
ERR("Failed to format local time timestamp in rotate session command");
- ret = -LTTNG_ERR_UNK;
+ cmd_ret = LTTNG_ERR_UNK;
goto end;
}
+
+ /*
+ * 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;
+
if (session->kernel_session) {
/*
* The active path for the next rotation/destroy.
datetime, session->current_archive_id + 1);
if (ret < 0 || ret == sizeof(session->rotation_chunk.active_tracing_path)) {
ERR("Failed to format active kernel tracing path in rotate session command");
- ret = -LTTNG_ERR_UNK;
- goto end;
+ cmd_ret = LTTNG_ERR_UNK;
+ goto error;
}
/*
* The sub-directory for the consumer
session->current_archive_id + 1);
if (ret < 0 || ret == sizeof(session->kernel_session->consumer->chunk_path)) {
ERR("Failed to format the kernel consumer's sub-directory in rotate session command");
- ret = -LTTNG_ERR_UNK;
- goto end;
+ cmd_ret = LTTNG_ERR_UNK;
+ goto error;
}
/*
* Create the new chunk folder, before the rotation begins so we don't
if (ret) {
ERR("Failed to create kernel session tracing path at %s",
session->kernel_session->consumer->chunk_path);
- ret = -LTTNG_ERR_CREATE_DIR_FAIL;
- goto end;
+ cmd_ret = LTTNG_ERR_CREATE_DIR_FAIL;
+ goto error;
}
- ret = kernel_rotate_session(session);
- if (ret != LTTNG_OK) {
- ret = -ret;
- goto end;
+ cmd_ret = kernel_rotate_session(session);
+ if (cmd_ret != LTTNG_OK) {
+ goto error;
}
}
if (session->ust_session) {
datetime, session->current_archive_id + 1);
if (ret < 0) {
ERR("Failed to format active UST tracing path in rotate session command");
- ret = -LTTNG_ERR_UNK;
- goto end;
+ cmd_ret = LTTNG_ERR_UNK;
+ goto error;
}
ret = snprintf(session->ust_session->consumer->chunk_path,
PATH_MAX, "/%s-%" PRIu64, datetime,
session->current_archive_id + 1);
if (ret < 0) {
ERR("Failed to format the UST consumer's sub-directory in rotate session command");
- ret = -LTTNG_ERR_UNK;
- goto end;
+ cmd_ret = LTTNG_ERR_UNK;
+ goto error;
}
/*
* Create the new chunk folder, before the rotation begins so we don't
session->ust_session->uid,
session->ust_session->gid);
if (ret) {
- ret = -LTTNG_ERR_CREATE_DIR_FAIL;
- goto end;
+ cmd_ret = LTTNG_ERR_CREATE_DIR_FAIL;
+ goto error;
}
- ret = ust_app_rotate_session(session);
- if (ret != LTTNG_OK) {
- goto end;
+ /*
+ * TODO: ust_app_rotate_session must be adapted to return
+ * an lttng_error_code, like its kernel counterpart.
+ */
+ cmd_ret = ust_app_rotate_session(session);
+ if (cmd_ret != LTTNG_OK) {
+ goto error;
}
}
ret = timer_session_rotation_pending_check_start(session,
DEFAULT_ROTATE_PENDING_TIMER);
if (ret) {
- goto end;
+ cmd_ret = LTTNG_ERR_UNK;
+ goto error;
}
if (!session->active) {
rotate_return->rotation_id = session->current_archive_id;
}
+ ret = notification_thread_command_session_rotation_ongoing(
+ notification_thread_handle,
+ session->name, session->uid, session->gid,
+ 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);
+ cmd_ret = ret;
+ }
+
DBG("Cmd rotate session %s, archive_id %" PRIu64 " sent",
session->name, session->current_archive_id - 1);
- ret = LTTNG_OK;
-
end:
+ ret = (cmd_ret == LTTNG_OK) ? cmd_ret : -((int) cmd_ret);
return ret;
+error:
+ session->last_chunk_start_ts = original_last_chunk_start_ts;
+ session->current_archive_id = original_current_chunk_start_ts;
+ if (session_reset_rotation_state(session,
+ LTTNG_ROTATION_STATE_NO_ROTATION)) {
+ ERR("Failed to reset rotation state of session \"%s\"",
+ session->name);
+ }
+ goto end;
}
/*
projects / lttng-tools.git / blobdiff