Fix: consumer: snapshot error return code
[lttng-tools.git] / src / common / ust-consumer / ust-consumer.c
index 5e34b1a36919773da0b51c751cc3ceb38b6514f9..73d27b57b04effa5ad3307576e3b1461be63699c 100644 (file)
@@ -987,15 +987,17 @@ end:
 
 /*
  * Snapshot the whole metadata.
+ * RCU read-side lock must be held across this function to ensure existence of
+ * metadata_channel.
  *
  * Returns 0 on success, < 0 on error
  */
-static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id,
+static int snapshot_metadata(struct lttng_consumer_channel *metadata_channel,
+               uint64_t key, char *path, uint64_t relayd_id,
                struct lttng_consumer_local_data *ctx,
                uint64_t trace_archive_id)
 {
        int ret = 0;
-       struct lttng_consumer_channel *metadata_channel;
        struct lttng_consumer_stream *metadata_stream;
 
        assert(path);
@@ -1006,13 +1008,6 @@ static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id,
 
        rcu_read_lock();
 
-       metadata_channel = consumer_find_channel(key);
-       if (!metadata_channel) {
-               ERR("UST snapshot metadata channel not found for key %" PRIu64,
-                       key);
-               ret = -1;
-               goto error;
-       }
        assert(!metadata_channel->monitor);
 
        health_code_update();
@@ -1083,17 +1078,19 @@ error:
 
 /*
  * Take a snapshot of all the stream of a channel.
+ * RCU read-side lock must be held across this function to ensure existence of
+ * channel.
  *
  * Returns 0 on success, < 0 on error
  */
-static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id,
+static int snapshot_channel(struct lttng_consumer_channel *channel,
+               uint64_t key, char *path, uint64_t relayd_id,
                uint64_t nb_packets_per_stream,
                struct lttng_consumer_local_data *ctx)
 {
        int ret;
        unsigned use_relayd = 0;
        unsigned long consumed_pos, produced_pos;
-       struct lttng_consumer_channel *channel;
        struct lttng_consumer_stream *stream;
 
        assert(path);
@@ -1105,12 +1102,6 @@ static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id,
                use_relayd = 1;
        }
 
-       channel = consumer_find_channel(key);
-       if (!channel) {
-               ERR("UST snapshot channel not found for key %" PRIu64, key);
-               ret = -1;
-               goto error;
-       }
        assert(!channel->monitor);
        DBG("UST consumer snapshot channel %" PRIu64, key);
 
@@ -1247,7 +1238,6 @@ error_close_stream:
        consumer_stream_close(stream);
 error_unlock:
        pthread_mutex_unlock(&stream->lock);
-error:
        rcu_read_unlock();
        return ret;
 }
@@ -1751,28 +1741,36 @@ int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
        }
        case LTTNG_CONSUMER_SNAPSHOT_CHANNEL:
        {
-               if (msg.u.snapshot_channel.metadata) {
-                       ret = snapshot_metadata(msg.u.snapshot_channel.key,
-                                       msg.u.snapshot_channel.pathname,
-                                       msg.u.snapshot_channel.relayd_id,
-                                       ctx,
-                                       msg.u.snapshot_channel.trace_archive_id);
-                       if (ret < 0) {
-                               ERR("Snapshot metadata failed");
-                               ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA;
-                       }
+               struct lttng_consumer_channel *channel;
+               uint64_t key = msg.u.snapshot_channel.key;
+
+               channel = consumer_find_channel(key);
+               if (!channel) {
+                       DBG("UST snapshot channel not found for key %" PRIu64, key);
+                       ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND;
                } else {
-                       ret = snapshot_channel(msg.u.snapshot_channel.key,
-                                       msg.u.snapshot_channel.pathname,
-                                       msg.u.snapshot_channel.relayd_id,
-                                       msg.u.snapshot_channel.nb_packets_per_stream,
-                                       ctx);
-                       if (ret < 0) {
-                               ERR("Snapshot channel failed");
-                               ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL;
+                       if (msg.u.snapshot_channel.metadata) {
+                               ret = snapshot_metadata(channel, key,
+                                               msg.u.snapshot_channel.pathname,
+                                               msg.u.snapshot_channel.relayd_id,
+                                               ctx,
+                                               msg.u.snapshot_channel.trace_archive_id);
+                               if (ret < 0) {
+                                       ERR("Snapshot metadata failed");
+                                       ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED;
+                               }
+                       } else {
+                               ret = snapshot_channel(channel, key,
+                                               msg.u.snapshot_channel.pathname,
+                                               msg.u.snapshot_channel.relayd_id,
+                                               msg.u.snapshot_channel.nb_packets_per_stream,
+                                               ctx);
+                               if (ret < 0) {
+                                       ERR("Snapshot channel failed");
+                                       ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED;
+                               }
                        }
                }
-
                health_code_update();
                ret = consumer_send_status_msg(sock, ret_code);
                if (ret < 0) {
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