Fix: rotation may never complete in per-PID buffering mode

[lttng-tools.git] / src / common / kernel-consumer / kernel-consumer.c

diff --git a/src/common/kernel-consumer/kernel-consumer.c b/src/common/kernel-consumer/kernel-consumer.c
index 3455f827b6b715c5415bcb3ee11c0d6147a46972..c223fa395af172525985e92bdaf8b39058647f6d 100644 (file)
--- a/src/common/kernel-consumer/kernel-consumer.c
+++ b/src/common/kernel-consumer/kernel-consumer.c
@@ -1082,47 +1082,6 @@ int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
                }
                break;
        }
-       case LTTNG_CONSUMER_SET_CHANNEL_ROTATE_PIPE:
-       {
-               int channel_rotate_pipe;
-               int flags;
-
-               ret_code = LTTCOMM_CONSUMERD_SUCCESS;
-               /* Successfully received the command's type. */
-               ret = consumer_send_status_msg(sock, ret_code);
-               if (ret < 0) {
-                       goto error_fatal;
-               }
-
-               ret = lttcomm_recv_fds_unix_sock(sock, &channel_rotate_pipe, 1);
-               if (ret != (ssize_t) sizeof(channel_rotate_pipe)) {
-                       ERR("Failed to receive channel rotate pipe");
-                       goto error_fatal;
-               }
-
-               DBG("Received channel rotate pipe (%d)", channel_rotate_pipe);
-               ctx->channel_rotate_pipe = channel_rotate_pipe;
-               /* Set the pipe as non-blocking. */
-               ret = fcntl(channel_rotate_pipe, F_GETFL, 0);
-               if (ret == -1) {
-                       PERROR("fcntl get flags of the channel rotate pipe");
-                       goto error_fatal;
-               }
-               flags = ret;
-
-               ret = fcntl(channel_rotate_pipe, F_SETFL, flags | O_NONBLOCK);
-               if (ret == -1) {
-                       PERROR("fcntl set O_NONBLOCK flag of the channel rotate pipe");
-                       goto error_fatal;
-               }
-               DBG("Channel rotate pipe set as non-blocking");
-               ret_code = LTTCOMM_CONSUMERD_SUCCESS;
-               ret = consumer_send_status_msg(sock, ret_code);
-               if (ret < 0) {
-                       goto error_fatal;
-               }
-               break;
-       }
        case LTTNG_CONSUMER_ROTATE_CHANNEL:
        {
                DBG("Consumer rotate channel %" PRIu64, msg.u.rotate_channel.key);
@@ -1183,19 +1142,18 @@ int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
                }
                break;
        }
-       case LTTNG_CONSUMER_ROTATE_PENDING_RELAY:
+       case LTTNG_CONSUMER_CHECK_ROTATION_PENDING_LOCAL:
        {
                int pending;
                uint32_t pending_reply;
 
-               DBG("Consumer rotate pending on relay for session %" PRIu64,
-                               msg.u.rotate_pending_relay.session_id);
-               pending = lttng_consumer_rotate_pending_relay(
-                               msg.u.rotate_pending_relay.session_id,
-                               msg.u.rotate_pending_relay.relayd_id,
-                               msg.u.rotate_pending_relay.chunk_id);
+               DBG("Perform local check of pending rotation for session id %" PRIu64,
+                               msg.u.check_rotation_pending_local.session_id);
+               pending = lttng_consumer_check_rotation_pending_local(
+                               msg.u.check_rotation_pending_local.session_id,
+                               msg.u.check_rotation_pending_local.chunk_id);
                if (pending < 0) {
-                       ERR("Rotate pending relay failed");
+                       ERR("Local rotation pending check failed with code %i", pending);
                        ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND;
                } else {
                        pending_reply = !!pending;
@@ -1222,7 +1180,51 @@ int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
                ret = lttcomm_send_unix_sock(sock, &pending_reply,
                                sizeof(pending_reply));
                if (ret < 0) {
-                       PERROR("send data pending ret code");
+                       PERROR("Failed to send rotation pending return code");
+                       goto error_fatal;
+               }
+               break;
+       }
+       case LTTNG_CONSUMER_CHECK_ROTATION_PENDING_RELAY:
+       {
+               int pending;
+               uint32_t pending_reply;
+
+               DBG("Perform relayd check of pending rotation for session id %" PRIu64,
+                               msg.u.check_rotation_pending_relay.session_id);
+               pending = lttng_consumer_check_rotation_pending_relay(
+                               msg.u.check_rotation_pending_relay.session_id,
+                               msg.u.check_rotation_pending_relay.relayd_id,
+                               msg.u.check_rotation_pending_relay.chunk_id);
+               if (pending < 0) {
+                       ERR("Relayd rotation pending check failed with code %i", pending);
+                       ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND;
+               } else {
+                       pending_reply = !!pending;
+               }
+
+               health_code_update();
+
+               ret = consumer_send_status_msg(sock, ret_code);
+               if (ret < 0) {
+                       /* Somehow, the session daemon is not responding anymore. */
+                       goto end_nosignal;
+               }
+
+               if (pending < 0) {
+                       /*
+                        * An error occured while running the command;
+                        * don't send the 'pending' flag as the sessiond
+                        * will not read it.
+                        */
+                       break;
+               }
+
+               /* Send back returned value to session daemon */
+               ret = lttcomm_send_unix_sock(sock, &pending_reply,
+                               sizeof(pending_reply));
+               if (ret < 0) {
+                       PERROR("Failed to send rotation pending return code");
                        goto error_fatal;
                }
                break;