Launch the notification thread using lttng_thread

[lttng-tools.git] / src / bin / lttng-sessiond / kernel.c

diff --git a/src/bin/lttng-sessiond/kernel.c b/src/bin/lttng-sessiond/kernel.c
index e7f1d54a02bde7ecb72ec2e16e122982aeae319c..8e972b0693cc28362fe36e9a80b040d128bed62c 100644 (file)
--- a/src/bin/lttng-sessiond/kernel.c
+++ b/src/bin/lttng-sessiond/kernel.c
@@ -1233,17 +1233,18 @@ void kernel_destroy_channel(struct ltt_kernel_channel *kchan)
 /*
  * Take a snapshot for a given kernel session.
  *
- * Return 0 on success or else return a LTTNG_ERR code.
+ * Return LTTNG_OK on success or else return a LTTNG_ERR code.
  */
-int kernel_snapshot_record(struct ltt_kernel_session *ksess,
+enum lttng_error_code kernel_snapshot_record(struct ltt_kernel_session *ksess,
                struct snapshot_output *output, int wait,
                uint64_t nb_packets_per_stream)
 {
        int err, ret, saved_metadata_fd;
+       enum lttng_error_code status = LTTNG_OK;
        struct consumer_socket *socket;
        struct lttng_ht_iter iter;
        struct ltt_kernel_metadata *saved_metadata;
-       struct ltt_session *session;
+       struct ltt_session *session = NULL;
        uint64_t trace_archive_id;
 
        assert(ksess);
@@ -1266,13 +1267,13 @@ int kernel_snapshot_record(struct ltt_kernel_session *ksess,
 
        ret = kernel_open_metadata(ksess);
        if (ret < 0) {
-               ret = LTTNG_ERR_KERN_META_FAIL;
+               status = LTTNG_ERR_KERN_META_FAIL;
                goto error;
        }
 
        ret = kernel_open_metadata_stream(ksess);
        if (ret < 0) {
-               ret = LTTNG_ERR_KERN_META_FAIL;
+               status = LTTNG_ERR_KERN_META_FAIL;
                goto error_open_stream;
        }
 
@@ -1296,19 +1297,18 @@ int kernel_snapshot_record(struct ltt_kernel_session *ksess,
                /* Put back the saved consumer output into the session. */
                ksess->consumer = saved_output;
                if (ret < 0) {
-                       ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
+                       status = LTTNG_ERR_KERN_CONSUMER_FAIL;
                        goto error_consumer;
                }
 
                /* For each channel, ask the consumer to snapshot it. */
                cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
-                       ret = consumer_snapshot_channel(socket, chan->key, output, 0,
+                       status = consumer_snapshot_channel(socket, chan->key, output, 0,
                                        ksess->uid, ksess->gid,
                                        DEFAULT_KERNEL_TRACE_DIR, wait,
                                        nb_packets_per_stream,
                                        trace_archive_id);
-                       if (ret < 0) {
-                               ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
+                       if (status != LTTNG_OK) {
                                (void) kernel_consumer_destroy_metadata(socket,
                                                ksess->metadata);
                                goto error_consumer;
@@ -1316,12 +1316,11 @@ int kernel_snapshot_record(struct ltt_kernel_session *ksess,
                }
 
                /* Snapshot metadata, */
-               ret = consumer_snapshot_channel(socket, ksess->metadata->key, output,
+               status = consumer_snapshot_channel(socket, ksess->metadata->key, output,
                                1, ksess->uid, ksess->gid,
                                DEFAULT_KERNEL_TRACE_DIR, wait, 0,
                                trace_archive_id);
-               if (ret < 0) {
-                       ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
+               if (status != LTTNG_OK) {
                        goto error_consumer;
                }
 
@@ -1332,8 +1331,6 @@ int kernel_snapshot_record(struct ltt_kernel_session *ksess,
                (void) kernel_consumer_destroy_metadata(socket, ksess->metadata);
        }
 
-       ret = LTTNG_OK;
-
 error_consumer:
        /* Close newly opened metadata stream. It's now on the consumer side. */
        err = close(ksess->metadata_stream_fd);
@@ -1347,9 +1344,11 @@ error:
        /* Restore metadata state.*/
        ksess->metadata = saved_metadata;
        ksess->metadata_stream_fd = saved_metadata_fd;
-
+       if (session) {
+               session_put(session);
+       }
        rcu_read_unlock();
-       return ret;
+       return status;
 }
 
 /*
@@ -1401,11 +1400,12 @@ error:
 /*
  * Rotate a kernel session.
  *
- * Return 0 on success or else return a LTTNG_ERR code.
+ * Return LTTNG_OK on success or else an LTTng error code.
  */
-int kernel_rotate_session(struct ltt_session *session)
+enum lttng_error_code kernel_rotate_session(struct ltt_session *session)
 {
        int ret;
+       enum lttng_error_code status = LTTNG_OK;
        struct consumer_socket *socket;
        struct lttng_ht_iter iter;
        struct ltt_kernel_session *ksess = session->kernel_session;
@@ -1426,37 +1426,17 @@ int kernel_rotate_session(struct ltt_session *session)
                        socket, node.node) {
                struct ltt_kernel_channel *chan;
 
-               /*
-                * Account the metadata channel first to make sure the
-                * number of channels waiting for a rotation cannot
-                * reach 0 before we complete the iteration over all
-                * the channels.
-                */
-               ret = rotate_add_channel_pending(ksess->metadata->key,
-                               LTTNG_DOMAIN_KERNEL, session);
-               if (ret < 0) {
-                       ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
-                       goto error;
-               }
-
                /* For each channel, ask the consumer to rotate it. */
                cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
-                       ret = rotate_add_channel_pending(chan->key,
-                                       LTTNG_DOMAIN_KERNEL, session);
-                       if (ret < 0) {
-                               ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
-                               goto error;
-                       }
-
-                       DBG("Rotate channel %" PRIu64 ", session %s", chan->key, session->name);
+                       DBG("Rotate kernel channel %" PRIu64 ", session %s",
+                                       chan->key, session->name);
                        ret = consumer_rotate_channel(socket, chan->key,
                                        ksess->uid, ksess->gid, ksess->consumer,
                                        ksess->consumer->subdir,
                                        /* is_metadata_channel */ false,
-                                       session->current_archive_id,
-                                       &session->rotate_pending_relay);
+                                       session->current_archive_id);
                        if (ret < 0) {
-                               ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
+                               status = LTTNG_ERR_KERN_CONSUMER_FAIL;
                                goto error;
                        }
                }
@@ -1468,17 +1448,14 @@ int kernel_rotate_session(struct ltt_session *session)
                                ksess->uid, ksess->gid, ksess->consumer,
                                ksess->consumer->subdir,
                                /* is_metadata_channel */ true,
-                               session->current_archive_id,
-                               &session->rotate_pending_relay);
+                               session->current_archive_id);
                if (ret < 0) {
-                       ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
+                       status = LTTNG_ERR_KERN_CONSUMER_FAIL;
                        goto error;
                }
        }
 
-       ret = LTTNG_OK;
-
 error:
        rcu_read_unlock();
-       return ret;
+       return status;
 }