X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fkernel-consumer%2Fkernel-consumer.c;h=9e3540426620f64f89cf69c8bbefa3cbe08f8962;hp=e5c0c2e83a3930e1079ef96d056767b64893a7c7;hb=93ec662e687dc15a3601704a1e0c96c51ad228c9;hpb=b31610f2294a6a827fa2d0d19d71199567db8dc5

diff --git a/src/common/kernel-consumer/kernel-consumer.c b/src/common/kernel-consumer/kernel-consumer.c
index e5c0c2e83..9e3540426 100644
--- a/src/common/kernel-consumer/kernel-consumer.c
+++ b/src/common/kernel-consumer/kernel-consumer.c
@@ -1202,6 +1202,37 @@ end:
 	return ret;
 }
 
+/*
+ * Check if the local version of the metadata stream matches with the version
+ * of the metadata stream in the kernel. If it was updated, set the reset flag
+ * on the stream.
+ */
+static
+int metadata_stream_check_version(int infd, struct lttng_consumer_stream *stream)
+{
+	int ret;
+	uint64_t cur_version;
+
+	ret = kernctl_get_metadata_version(infd, &cur_version);
+	if (ret < 0) {
+		ERR("Failed to get the metadata version");
+		goto end;
+	}
+
+	if (stream->metadata_version == cur_version) {
+		ret = 0;
+		goto end;
+	}
+
+	DBG("New metadata version detected");
+	stream->metadata_version = cur_version;
+	stream->reset_metadata_flag = 1;
+	ret = 0;
+
+end:
+	return ret;
+}
+
 /*
  * Consume data on a file descriptor and write it on a trace file.
  */
@@ -1272,6 +1303,10 @@ ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
 		}
 	} else {
 		write_index = 0;
+		ret = metadata_stream_check_version(infd, stream);
+		if (ret < 0) {
+			goto end;
+		}
 	}
 
 	switch (stream->chan->output) {