Fix: common: abort on rotation after time manipulation

[lttng-tools.git] / src / common / trace-chunk.c

diff --git a/src/common/trace-chunk.c b/src/common/trace-chunk.c
index 944743e0b585ba9458ba9e681aa974f80335fd56..bed6b73afb5d7cd79b3fab13552cb5d75a7df808 100644 (file)
--- a/src/common/trace-chunk.c
+++ b/src/common/trace-chunk.c
@@ -84,8 +84,14 @@ struct lttng_trace_chunk {
        char *name;
        /* An unset id means the chunk is anonymous. */
        LTTNG_OPTIONAL(uint64_t) id;
+
+       /*
+        * The creation and close timestamps are NOT monotonic.
+        * They must not be used in context were monotonicity is required.
+        */
        LTTNG_OPTIONAL(time_t) timestamp_creation;
        LTTNG_OPTIONAL(time_t) timestamp_close;
+
        LTTNG_OPTIONAL(struct chunk_credentials) credentials;
        LTTNG_OPTIONAL(struct lttng_directory_handle) session_output_directory;
        LTTNG_OPTIONAL(struct lttng_directory_handle) chunk_directory;
@@ -432,11 +438,20 @@ enum lttng_trace_chunk_status lttng_trace_chunk_set_close_timestamp(
                status = LTTNG_TRACE_CHUNK_STATUS_INVALID_OPERATION;
                goto end;
        }
+
+       /*
+        * Note: we do not enforce that the closing timestamp be greater or
+        * equal to the begin timestamp. These timestamps are used for
+        * generating the chunk name and should only be used in context where
+        * the monotonicity of time is not important. The source of those
+        * timestamps is NOT monotonic and represent the system calendar time,
+        * also know as the wall time.
+        */
        if (chunk->timestamp_creation.value > close_ts) {
-               ERR("Failed to set trace chunk close timestamp: close timestamp is before creation timestamp");
-               status = LTTNG_TRACE_CHUNK_STATUS_INVALID_ARGUMENT;
-               goto end;
+               WARN("Set trace chunk close timestamp: close timestamp is before creation timestamp, begin : %ld, close : %ld",
+                               chunk->timestamp_creation.value, close_ts);
        }
+
        LTTNG_OPTIONAL_SET(&chunk->timestamp_close, close_ts);
        if (!chunk->name_overridden) {
                free(chunk->name);