X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fcmd.c;h=02a92be1e07e45ba71e4c767ebca0f6a18050ec9;hp=5a122d8d3c8dcf7e7f361b34f69f46c4680c0d22;hb=a40a503f4218296700d791f1b79671bf3d0f1e22;hpb=1f4962443f25c371e4b54e97f9eb867d67cbf88e

diff --git a/src/bin/lttng-sessiond/cmd.c b/src/bin/lttng-sessiond/cmd.c
index 5a122d8d3..02a92be1e 100644
--- a/src/bin/lttng-sessiond/cmd.c
+++ b/src/bin/lttng-sessiond/cmd.c
@@ -1185,6 +1185,7 @@ int cmd_setup_relayd(struct ltt_session *session)
 
 	DBG("Setting relayd for session %s", session->name);
 
+	rcu_read_lock();
 	if (session->current_trace_chunk) {
 		enum lttng_trace_chunk_status status = lttng_trace_chunk_get_id(
 				session->current_trace_chunk, &current_chunk_id.value);
@@ -1198,8 +1199,6 @@ int cmd_setup_relayd(struct ltt_session *session)
 		}
 	}
 
-	rcu_read_lock();
-
 	if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
 			&& usess->consumer->enabled) {
 		/* For each consumer socket, send relayd sockets */
@@ -4908,6 +4907,12 @@ int cmd_rotate_session(struct ltt_session *session,
 		goto end;
 	}
 
+	/* Unsupported feature in lttng-modules before 2.8 (lack of sequence number). */
+	if (session->kernel_session && !kernel_supports_ring_buffer_packet_sequence_number()) {
+		cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_KERNEL;
+		goto end;
+	}
+
 	if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
 		DBG("Refusing to launch a rotation; a rotation is already in progress for session %s",
 				session->name);
@@ -4925,9 +4930,6 @@ int cmd_rotate_session(struct ltt_session *session,
 		cmd_ret = LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP;
 		goto end;
 	}
-
-	session->rotation_state = LTTNG_ROTATION_STATE_ONGOING;
-
 	if (session->active) {
 		new_trace_chunk = session_create_new_trace_chunk(session, NULL,
 				NULL, NULL);
@@ -4951,11 +4953,6 @@ int cmd_rotate_session(struct ltt_session *session,
 		goto error;
 	}
 
-	assert(chunk_being_archived);
-	chunk_status = lttng_trace_chunk_get_id(chunk_being_archived,
-			&ongoing_rotation_chunk_id);
-	assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
-
 	if (session->kernel_session) {
 		cmd_ret = kernel_rotate_session(session);
 		if (cmd_ret != LTTNG_OK) {
@@ -4971,6 +4968,26 @@ int cmd_rotate_session(struct ltt_session *session,
 		}
 	}
 
+	if (!session->active) {
+		session->rotated_after_last_stop = true;
+	}
+
+	if (!chunk_being_archived) {
+		DBG("Rotating session \"%s\" from a \"NULL\" trace chunk to a new trace chunk, skipping completion check",
+				session->name);
+		if (failed_to_rotate) {
+			cmd_ret = rotation_fail_code;
+			goto error;
+		}
+		cmd_ret = LTTNG_OK;
+		goto end;
+	}
+
+	session->rotation_state = LTTNG_ROTATION_STATE_ONGOING;
+	chunk_status = lttng_trace_chunk_get_id(chunk_being_archived,
+			&ongoing_rotation_chunk_id);
+	assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
+
 	ret = session_close_trace_chunk(session, chunk_being_archived,
 			quiet_rotation ?
 					NULL :
@@ -4995,10 +5012,6 @@ int cmd_rotate_session(struct ltt_session *session,
 		goto error;
 	}
 
-	if (!session->active) {
-		session->rotated_after_last_stop = true;
-	}
-
 	if (rotate_return) {
 		rotate_return->rotation_id = ongoing_rotation_chunk_id;
 	}