SoW-2019-0002: Dynamic Snapshot

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

diff --git a/src/bin/lttng-sessiond/session.c b/src/bin/lttng-sessiond/session.c
index 0da2058fdf28dbbef05f0d2490cfbf49a089a294..03bec43fd9284009fbdb7e07e85519d8116f7746 100644 (file)
--- a/src/bin/lttng-sessiond/session.c
+++ b/src/bin/lttng-sessiond/session.c
@@ -1,18 +1,8 @@
 /*
- * Copyright (C)  2011 - David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
  *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #define _LGPL_SOURCE
@@ -589,6 +579,7 @@ struct lttng_trace_chunk *session_create_new_trace_chunk(
        };
        uint64_t next_chunk_id;
        const struct consumer_output *output;
+       const char *new_path;
 
        if (consumer_output_override) {
                output = consumer_output_override;
@@ -612,8 +603,26 @@ struct lttng_trace_chunk *session_create_new_trace_chunk(
        next_chunk_id = session->most_recent_chunk_id.is_set ?
                        session->most_recent_chunk_id.value + 1 : 0;
 
+       if (session->current_trace_chunk &&
+                       !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) {
+               chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk,
+                                       DEFAULT_CHUNK_TMP_OLD_DIRECTORY);
+               if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+                       goto error;
+               }
+       }
+       if (!session->current_trace_chunk) {
+               if (!session->rotated) {
+                       new_path = "";
+               } else {
+                       new_path = NULL;
+               }
+       } else {
+               new_path = DEFAULT_CHUNK_TMP_NEW_DIRECTORY;
+       }
+
        trace_chunk = lttng_trace_chunk_create(next_chunk_id,
-                       chunk_creation_ts);
+                       chunk_creation_ts, new_path);
        if (!trace_chunk) {
                goto error;
        }
@@ -678,6 +687,7 @@ int session_close_trace_chunk(struct ltt_session *session,
        struct consumer_socket *socket;
        enum lttng_trace_chunk_status chunk_status;
        const time_t chunk_close_timestamp = time(NULL);
+       const char *new_path;
 
        chunk_status = lttng_trace_chunk_set_close_command(
                        trace_chunk, close_command);
@@ -692,6 +702,44 @@ int session_close_trace_chunk(struct ltt_session *session,
                ret = -1;
                goto end;
        }
+
+       if (close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE && !session->rotated) {
+               /* New chunk stays in session output directory. */
+               new_path = "";
+       } else {
+               /* Use chunk name for new chunk. */
+               new_path = NULL;
+       }
+       if (session->current_trace_chunk &&
+                       !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) {
+               /* Rename new chunk path. */
+               chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk,
+                                       new_path);
+               if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+                       ret = -1;
+                       goto end;
+               }
+       }
+       if (!lttng_trace_chunk_get_name_overridden(trace_chunk) &&
+                       close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION) {
+               const char *old_path;
+
+               if (!session->rotated) {
+                       old_path = "";
+               } else {
+                       old_path = NULL;
+               }
+               /* We need to move back the .tmp_old_chunk to its rightful place. */
+               chunk_status = lttng_trace_chunk_rename_path(trace_chunk,
+                                       old_path);
+               if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+                       ret = -1;
+                       goto end;
+               }
+       }
+       if (close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED) {
+               session->rotated = true;
+       }
        chunk_status = lttng_trace_chunk_set_close_timestamp(trace_chunk,
                        chunk_close_timestamp);
        if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {