X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-relayd%2Fstream.h;h=5e23e7339cf4fcf7495f2ae4825fcdfdd57641d1;hb=bc26e826ebd59d3888e6db0d4985cfb3444f5c09;hp=fb3e1ed68b936e1fd7411273c4b7a9b338f76e0b;hpb=81164b6b222b4bafe1e3cec57c50429ab6dab30f;p=lttng-tools.git

diff --git a/src/bin/lttng-relayd/stream.h b/src/bin/lttng-relayd/stream.h
index fb3e1ed68..5e23e7339 100644
--- a/src/bin/lttng-relayd/stream.h
+++ b/src/bin/lttng-relayd/stream.h
@@ -52,8 +52,12 @@ struct relay_stream {
 	 * inside the ctf_trace lock.
 	 */
 	pthread_mutex_t lock;
-	uint64_t prev_seq;		/* previous data sequence number encountered. */
-	uint64_t last_net_seq_num;	/* seq num to encounter before closing. */
+	/* previous data sequence number written to disk. */
+	uint64_t prev_data_seq;
+	/* previous index sequence number written to disk. */
+	uint64_t prev_index_seq;
+	/* seq num to encounter before closing. */
+	uint64_t last_net_seq_num;
 
 	/* FD on which to write the stream data. */
 	struct stream_fd *stream_fd;
@@ -61,6 +65,20 @@ struct relay_stream {
 	struct lttng_index_file *index_file;
 
 	char *path_name;
+	/*
+	 * prev_path_name is only used for session rotation support.
+	 * It is essentially used to work around the fact that index
+	 * files are always created from the 'data' connection.
+	 *
+	 * Hence, it is possible to receive a ROTATE_STREAM command
+	 * which affects the stream's path_name before the creation of
+	 * an index file. In this situation, the index file of the
+	 * 'previous' chunk would be created in the new destination folder.
+	 *
+	 * It would then be unlinked when the actual index of the new chunk
+	 * is created.
+	 */
+	char *prev_path_name;
 	char *channel_name;
 
 	/* On-disk circular buffer of tracefiles. */
@@ -148,6 +166,14 @@ struct relay_stream {
 	 * Always access with stream lock held.
 	 */
 	uint64_t rotate_at_seq_num;
+	/*
+	 * When rotate_at_seq_num != -1ULL, meaning that a rotation is ongoing,
+	 * data_rotated and index_rotated respectively indicate if the stream's
+	 * data and index have been rotated. A rotation is considered completed
+	 * when both rotations have occurred.
+	 */
+	bool data_rotated;
+	bool index_rotated;
 	/*
 	 * This is the id of the chunk where we are writing to if no rotation is
 	 * pending (rotate_at_seq_num == -1ULL). If a rotation is pending, this