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060e2e0)
In the shm-path mode, the metadata will be backuped to a metadata
file, when run the lttng command "lttng metadata regenerate" to
resample the wall time following a major NTP correction, the metadata
file will not be truncated and regenerated.
Add the function clear_metadata_file() to truncate and regenerate the
metadata file.
Signed-off-by: Liguang Li <liguang.li@windriver.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
+static
+int clear_metadata_file(int fd)
+{
+ int ret;
+
+ ret = lseek(fd, 0, SEEK_SET);
+ if (ret < 0) {
+ PERROR("lseek");
+ goto end;
+ }
+
+ ret = ftruncate(fd, 0);
+ if (ret < 0) {
+ PERROR("ftruncate");
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
static
int ust_regenerate_metadata(struct ltt_ust_session *usess)
{
static
int ust_regenerate_metadata(struct ltt_ust_session *usess)
{
memset(registry->metadata, 0, registry->metadata_alloc_len);
registry->metadata_len = 0;
registry->metadata_version++;
memset(registry->metadata, 0, registry->metadata_alloc_len);
registry->metadata_len = 0;
registry->metadata_version++;
+ if (registry->metadata_fd > 0) {
+ /* Clear the metadata file's content. */
+ ret = clear_metadata_file(registry->metadata_fd);
+ if (ret) {
+ pthread_mutex_unlock(®istry->lock);
+ goto end;
+ }
+ }
+
ret = ust_metadata_session_statedump(registry, NULL,
registry->major, registry->minor);
if (ret) {
ret = ust_metadata_session_statedump(registry, NULL,
registry->major, registry->minor);
if (ret) {