--- /dev/null
+/*
+ * Copyright (C) 2017 - Julien Desfossez <jdesfossez@efficios.com>
+ *
+ * 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.
+ *
+ * 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
+#include <lttng/trigger/trigger.h>
+#include <common/error.h>
+#include <common/config/session-config.h>
+#include <common/defaults.h>
+#include <common/utils.h>
+#include <common/futex.h>
+#include <common/align.h>
+#include <common/time.h>
+#include <common/hashtable/utils.h>
+#include <common/kernel-ctl/kernel-ctl.h>
+#include <sys/eventfd.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <signal.h>
+#include <inttypes.h>
+
+#include "session.h"
+#include "rotate.h"
+#include "rotation-thread.h"
+#include "lttng-sessiond.h"
+#include "health-sessiond.h"
+#include "cmd.h"
+#include "utils.h"
+
+#include <urcu.h>
+#include <urcu/list.h>
+#include <urcu/rculfhash.h>
+
+unsigned long hash_channel_key(struct rotation_channel_key *key)
+{
+ return hash_key_u64(&key->key, lttng_ht_seed) ^ hash_key_ulong(
+ (void *) (unsigned long) key->domain, lttng_ht_seed);
+}
+
+/* The session's lock must be held by the caller. */
+static
+int session_rename_chunk(struct ltt_session *session, char *current_path,
+ char *new_path)
+{
+ int ret;
+ struct consumer_socket *socket;
+ struct consumer_output *output;
+ struct lttng_ht_iter iter;
+ uid_t uid;
+ gid_t gid;
+
+ DBG("Renaming session chunk path of session \"%s\" from %s to %s",
+ session->name, current_path, new_path);
+
+ /*
+ * Either one of the sessions is enough to find the consumer_output
+ * and uid/gid.
+ */
+ if (session->kernel_session) {
+ output = session->kernel_session->consumer;
+ uid = session->kernel_session->uid;
+ gid = session->kernel_session->gid;
+ } else if (session->ust_session) {
+ output = session->ust_session->consumer;
+ uid = session->ust_session->uid;
+ gid = session->ust_session->gid;
+ } else {
+ assert(0);
+ }
+
+ if (!output || !output->socks) {
+ ERR("No consumer output found for session \"%s\"",
+ session->name);
+ ret = -1;
+ goto end;
+ }
+
+ rcu_read_lock();
+ /*
+ * We have to iterate to find a socket, but we only need to send the
+ * rename command to one consumer, so we break after the first one.
+ */
+ cds_lfht_for_each_entry(output->socks->ht, &iter.iter, socket, node.node) {
+ pthread_mutex_lock(socket->lock);
+ ret = consumer_rotate_rename(socket, session->id, output,
+ current_path, new_path, uid, gid);
+ pthread_mutex_unlock(socket->lock);
+ if (ret) {
+ ret = -1;
+ goto end_unlock;
+ }
+ break;
+ }
+
+ ret = 0;
+
+end_unlock:
+ rcu_read_unlock();
+end:
+ return ret;
+}
+
+/* The session's lock must be held by the caller. */
+static
+int rename_first_chunk(struct ltt_session *session,
+ struct consumer_output *consumer, char *new_path)
+{
+ int ret;
+ char current_full_path[LTTNG_PATH_MAX], new_full_path[LTTNG_PATH_MAX];
+
+ /* Current domain path: <session>/kernel */
+ if (session->net_handle > 0) {
+ ret = snprintf(current_full_path, sizeof(current_full_path), "%s/%s",
+ consumer->dst.net.base_dir, consumer->subdir);
+ if (ret < 0 || ret >= sizeof(current_full_path)) {
+ ERR("Failed to initialize current full path while renaming first rotation chunk of session \"%s\"",
+ session->name);
+ ret = -1;
+ goto error;
+ }
+ } else {
+ ret = snprintf(current_full_path, sizeof(current_full_path), "%s/%s",
+ consumer->dst.session_root_path, consumer->subdir);
+ if (ret < 0 || ret >= sizeof(current_full_path)) {
+ ERR("Failed to initialize current full path while renaming first rotation chunk of session \"%s\"",
+ session->name);
+ ret = -1;
+ goto error;
+ }
+ }
+ /* New domain path: <session>/<start-date>-<end-date>-<rotate-count>/kernel */
+ ret = snprintf(new_full_path, sizeof(new_full_path), "%s/%s",
+ new_path, consumer->subdir);
+ if (ret < 0 || ret >= sizeof(new_full_path)) {
+ ERR("Failed to initialize new full path while renaming first rotation chunk of session \"%s\"",
+ session->name);
+ ret = -1;
+ goto error;
+ }
+ /*
+ * Move the per-domain fcurrenter inside the first rotation
+ * fcurrenter.
+ */
+ ret = session_rename_chunk(session, current_full_path, new_full_path);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_UNK;
+ goto error;
+ }
+
+ ret = 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Rename a chunk folder after a rotation is complete.
+ * session_lock_list and session lock must be held.
+ *
+ * Returns 0 on success, a negative value on error.
+ */
+int rename_complete_chunk(struct ltt_session *session, time_t ts)
+{
+ struct tm *timeinfo;
+ char datetime[16], start_datetime[16];
+ char new_path[LTTNG_PATH_MAX];
+ int ret;
+ size_t strf_ret;
+
+ DBG("Renaming completed chunk for session %s", session->name);
+ timeinfo = localtime(&ts);
+ if (!timeinfo) {
+ ERR("Failed to retrieve local time while renaming completed chunk");
+ ret = -1;
+ goto end;
+ }
+ strf_ret = strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S",
+ timeinfo);
+ if (strf_ret == 0) {
+ ERR("Failed to format timestamp while renaming completed session chunk");
+ ret = -1;
+ goto end;
+ }
+
+ if (session->rotate_count == 1) {
+ char start_time[16];
+
+ timeinfo = localtime(&session->last_chunk_start_ts);
+ if (!timeinfo) {
+ ERR("Failed to retrieve local time while renaming completed chunk");
+ ret = -1;
+ goto end;
+ }
+
+ strf_ret = strftime(start_time, sizeof(start_time),
+ "%Y%m%d-%H%M%S", timeinfo);
+ if (strf_ret == 0) {
+ ERR("Failed to format timestamp while renaming completed session chunk");
+ ret = -1;
+ goto end;
+ }
+
+ /*
+ * On the first rotation, the current_rotate_path is the
+ * session_root_path, so we need to create the chunk folder
+ * and move the domain-specific folders inside it.
+ */
+ ret = snprintf(new_path, sizeof(new_path), "%s/%s-%s-%" PRIu64,
+ session->rotation_chunk.current_rotate_path,
+ start_time,
+ datetime, session->rotate_count);
+ if (ret < 0 || ret >= sizeof(new_path)) {
+ ERR("Failed to format new chunk path while renaming session \"%s\"'s first chunk",
+ session->name);
+ ret = -1;
+ goto end;
+ }
+
+ if (session->kernel_session) {
+ ret = rename_first_chunk(session,
+ session->kernel_session->consumer,
+ new_path);
+ if (ret) {
+ ERR("Failed to rename kernel session trace folder to %s", new_path);
+ /*
+ * This is not a fatal error for the rotation
+ * thread, we just need to inform the client
+ * that a problem occurred with the rotation.
+ * Returning 0, same for the other errors
+ * below.
+ */
+ ret = 0;
+ goto error;
+ }
+ }
+ if (session->ust_session) {
+ ret = rename_first_chunk(session,
+ session->ust_session->consumer,
+ new_path);
+ if (ret) {
+ ERR("Failed to rename userspace session trace folder to %s", new_path);
+ ret = 0;
+ goto error;
+ }
+ }
+ } else {
+ /*
+ * After the first rotation, all the trace data is already in
+ * its own chunk folder, we just need to append the suffix.
+ */
+ /* Recreate the session->rotation_chunk.current_rotate_path */
+ timeinfo = localtime(&session->last_chunk_start_ts);
+ if (!timeinfo) {
+ ERR("Failed to retrieve local time while renaming completed chunk");
+ ret = -1;
+ goto end;
+ }
+ strf_ret = strftime(start_datetime, sizeof(start_datetime), "%Y%m%d-%H%M%S", timeinfo);
+ if (!strf_ret) {
+ ERR("Failed to format timestamp while renaming completed session chunk");
+ ret = -1;
+ goto end;
+ }
+ ret = snprintf(new_path, sizeof(new_path), "%s/%s-%s-%" PRIu64,
+ session_get_base_path(session),
+ start_datetime,
+ datetime, session->rotate_count);
+ if (ret < 0 || ret >= sizeof(new_path)) {
+ ERR("Failed to format new chunk path while renaming chunk of session \"%s\"",
+ session->name);
+ ret = -1;
+ goto error;
+ }
+ ret = session_rename_chunk(session,
+ session->rotation_chunk.current_rotate_path,
+ new_path);
+ if (ret) {
+ ERR("Failed to rename session trace folder from %s to %s",
+ session->rotation_chunk.current_rotate_path,
+ new_path);
+ ret = 0;
+ goto error;
+ }
+ }
+
+ /*
+ * Store the path where the readable chunk is. This path is valid
+ * and can be queried by the client with rotate_pending until the next
+ * rotation is started.
+ */
+ ret = lttng_strncpy(session->rotation_chunk.current_rotate_path,
+ new_path,
+ sizeof(session->rotation_chunk.current_rotate_path));
+ if (ret) {
+ ERR("Failed the current chunk's path of session \"%s\"",
+ session->name);
+ ret = -1;
+ goto error;
+ }
+
+ goto end;
+
+error:
+ session->rotation_status = LTTNG_ROTATION_STATUS_ERROR;
+end:
+ return ret;
+}
projects / lttng-tools.git / blobdiff