+int create_rotate_index_file(struct relay_stream *stream)
+{
+ int ret;
+ uint32_t major, minor;
+
+ /* Put ref on previous index_file. */
+ if (stream->index_file) {
+ lttng_index_file_put(stream->index_file);
+ stream->index_file = NULL;
+ }
+ major = stream->trace->session->major;
+ minor = stream->trace->session->minor;
+ stream->index_file = lttng_index_file_create(stream->path_name,
+ stream->channel_name,
+ -1, -1, stream->tracefile_size,
+ tracefile_array_get_file_index_head(stream->tfa),
+ lttng_to_index_major(major, minor),
+ lttng_to_index_minor(major, minor));
+ if (!stream->index_file) {
+ ret = -1;
+ goto end;
+ }
+
+ ret = 0;
+
+end:
+ return ret;
+}
+
+static
+int do_rotate_stream(struct relay_stream *stream)
+{
+ int ret;
+
+ /* Perform the stream rotation. */
+ ret = utils_rotate_stream_file(stream->path_name,
+ stream->channel_name, stream->tracefile_size,
+ stream->tracefile_count, -1,
+ -1, stream->stream_fd->fd,
+ NULL, &stream->stream_fd->fd);
+ if (ret < 0) {
+ ERR("Rotating stream output file");
+ goto end;
+ }
+ stream->tracefile_size_current = 0;
+
+ /* Rotate also the index if the stream is not a metadata stream. */
+ if (!stream->is_metadata) {
+ ret = create_rotate_index_file(stream);
+ if (ret < 0) {
+ ERR("Failed to rotate index file");
+ goto end;
+ }
+ }
+
+ stream->rotate_at_seq_num = -1ULL;
+ stream->pos_after_last_complete_data_index = 0;
+
+end:
+ return ret;
+}
+
+/*
+ * If too much data has been written in a tracefile before we received the
+ * rotation command, we have to move the excess data to the new tracefile and
+ * perform the rotation. This can happen because the control and data
+ * connections are separate, the indexes as well as the commands arrive from
+ * the control connection and we have no control over the order so we could be
+ * in a situation where too much data has been received on the data connection
+ * before the rotation command on the control connection arrives. We don't need
+ * to update the index because its order is guaranteed with the rotation
+ * command message.
+ */
+static
+int rotate_truncate_stream(struct relay_stream *stream)
+{
+ int ret, new_fd;
+ off_t lseek_ret;
+ uint64_t diff, pos = 0;
+ char buf[FILE_COPY_BUFFER_SIZE];
+
+ assert(!stream->is_metadata);
+
+ assert(stream->tracefile_size_current >
+ stream->pos_after_last_complete_data_index);
+ diff = stream->tracefile_size_current -
+ stream->pos_after_last_complete_data_index;
+
+ /* Create the new tracefile. */
+ new_fd = utils_create_stream_file(stream->path_name,
+ stream->channel_name,
+ stream->tracefile_size, stream->tracefile_count,
+ /* uid */ -1, /* gid */ -1, /* suffix */ NULL);
+ if (new_fd < 0) {
+ ERR("Failed to create new stream file at path %s for channel %s",
+ stream->path_name, stream->channel_name);
+ ret = -1;
+ goto end;
+ }
+
+ /*
+ * Rewind the current tracefile to the position at which the rotation
+ * should have occured.
+ */
+ lseek_ret = lseek(stream->stream_fd->fd,
+ stream->pos_after_last_complete_data_index, SEEK_SET);
+ if (lseek_ret < 0) {
+ PERROR("seek truncate stream");
+ ret = -1;
+ goto end;
+ }
+
+ /* Move data from the old file to the new file. */
+ while (pos < diff) {
+ uint64_t count, bytes_left;
+ ssize_t io_ret;
+
+ bytes_left = diff - pos;
+ count = bytes_left > sizeof(buf) ? sizeof(buf) : bytes_left;
+ assert(count <= SIZE_MAX);
+
+ io_ret = lttng_read(stream->stream_fd->fd, buf, count);
+ if (io_ret < (ssize_t) count) {
+ char error_string[256];
+
+ snprintf(error_string, sizeof(error_string),
+ "Failed to read %" PRIu64 " bytes from fd %i in rotate_truncate_stream(), returned %zi",
+ count, stream->stream_fd->fd, io_ret);
+ if (io_ret == -1) {
+ PERROR("%s", error_string);
+ } else {
+ ERR("%s", error_string);
+ }
+ ret = -1;
+ goto end;
+ }
+
+ io_ret = lttng_write(new_fd, buf, count);
+ if (io_ret < (ssize_t) count) {
+ char error_string[256];
+
+ snprintf(error_string, sizeof(error_string),
+ "Failed to write %" PRIu64 " bytes from fd %i in rotate_truncate_stream(), returned %zi",
+ count, new_fd, io_ret);
+ if (io_ret == -1) {
+ PERROR("%s", error_string);
+ } else {
+ ERR("%s", error_string);
+ }
+ ret = -1;
+ goto end;
+ }
+
+ pos += count;
+ }
+
+ /* Truncate the file to get rid of the excess data. */
+ ret = ftruncate(stream->stream_fd->fd,
+ stream->pos_after_last_complete_data_index);
+ if (ret) {
+ PERROR("ftruncate");
+ goto end;
+ }
+
+ ret = close(stream->stream_fd->fd);
+ if (ret < 0) {
+ PERROR("Closing tracefile");
+ goto end;
+ }
+
+ ret = create_rotate_index_file(stream);
+ if (ret < 0) {
+ ERR("Rotate stream index file");
+ goto end;
+ }
+
+ /*
+ * Update the offset and FD of all the eventual indexes created by the
+ * data connection before the rotation command arrived.
+ */
+ ret = relay_index_switch_all_files(stream);
+ if (ret < 0) {
+ ERR("Failed to rotate index file");
+ goto end;
+ }
+
+ stream->stream_fd->fd = new_fd;
+ stream->tracefile_size_current = diff;
+ stream->pos_after_last_complete_data_index = 0;
+ stream->rotate_at_seq_num = -1ULL;
+
+ ret = 0;
+
+end:
+ return ret;
+}
+
+/*
+ * Check if a stream should perform a rotation (for session rotation).
+ * Must be called with the stream lock held.
+ *
+ * Return 0 on success, a negative value on error.
+ */
+static
+int try_rotate_stream(struct relay_stream *stream)
+{
+ int ret = 0;
+
+ /* No rotation expected. */
+ if (stream->rotate_at_seq_num == -1ULL) {
+ goto end;
+ }
+
+ if (stream->prev_seq < stream->rotate_at_seq_num ||
+ stream->prev_seq == -1ULL) {
+ DBG("Stream %" PRIu64 " no yet ready for rotation",
+ stream->stream_handle);
+ goto end;
+ } else if (stream->prev_seq > stream->rotate_at_seq_num) {
+ DBG("Rotation after too much data has been written in tracefile "
+ "for stream %" PRIu64 ", need to truncate before "
+ "rotating", stream->stream_handle);
+ ret = rotate_truncate_stream(stream);
+ if (ret) {
+ ERR("Failed to truncate stream");
+ goto end;
+ }
+ } else {
+ /* stream->prev_seq == stream->rotate_at_seq_num */
+ DBG("Stream %" PRIu64 " ready for rotation",
+ stream->stream_handle);
+ ret = do_rotate_stream(stream);
+ }
+
+end:
+ return ret;
+}
+
+/*
+ * relay_recv_metadata: receive the metadata for the session.
+ */
+static int relay_recv_metadata(struct lttcomm_relayd_hdr *recv_hdr,