| 1 | /* |
| 2 | * Copyright (C) 2017 Julien Desfossez <jdesfossez@efficios.com> |
| 3 | * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 4 | * |
| 5 | * SPDX-License-Identifier: GPL-2.0-only |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #define _LGPL_SOURCE |
| 10 | #include "cmd.hpp" |
| 11 | #include "health-sessiond.hpp" |
| 12 | #include "lttng-sessiond.hpp" |
| 13 | #include "notification-thread-commands.hpp" |
| 14 | #include "rotate.hpp" |
| 15 | #include "rotation-thread.hpp" |
| 16 | #include "session.hpp" |
| 17 | #include "utils.hpp" |
| 18 | |
| 19 | #include <common/align.hpp> |
| 20 | #include <common/config/session-config.hpp> |
| 21 | #include <common/credentials.hpp> |
| 22 | #include <common/defaults.hpp> |
| 23 | #include <common/error.hpp> |
| 24 | #include <common/futex.hpp> |
| 25 | #include <common/hashtable/utils.hpp> |
| 26 | #include <common/kernel-ctl/kernel-ctl.hpp> |
| 27 | #include <common/time.hpp> |
| 28 | #include <common/utils.hpp> |
| 29 | |
| 30 | #include <lttng/action/action-internal.hpp> |
| 31 | #include <lttng/condition/condition-internal.hpp> |
| 32 | #include <lttng/notification/channel-internal.hpp> |
| 33 | #include <lttng/rotate-internal.hpp> |
| 34 | #include <lttng/trigger/trigger.h> |
| 35 | |
| 36 | #include <inttypes.h> |
| 37 | #include <signal.h> |
| 38 | #include <sys/stat.h> |
| 39 | #include <time.h> |
| 40 | #include <urcu.h> |
| 41 | #include <urcu/list.h> |
| 42 | #include <urcu/rculfhash.h> |
| 43 | |
| 44 | int subscribe_session_consumed_size_rotation( |
| 45 | struct ltt_session *session, |
| 46 | uint64_t size, |
| 47 | struct notification_thread_handle *notification_thread_handle) |
| 48 | { |
| 49 | int ret; |
| 50 | enum lttng_condition_status condition_status; |
| 51 | enum lttng_notification_channel_status nc_status; |
| 52 | const uint64_t eventfd_increment_value = 1; |
| 53 | struct lttng_condition *rotate_condition = nullptr; |
| 54 | struct lttng_action *notify_action = nullptr; |
| 55 | const struct lttng_credentials session_creds = { |
| 56 | .uid = LTTNG_OPTIONAL_INIT_VALUE(session->uid), |
| 57 | .gid = LTTNG_OPTIONAL_INIT_VALUE(session->gid), |
| 58 | }; |
| 59 | |
| 60 | rotate_condition = lttng_condition_session_consumed_size_create(); |
| 61 | if (!rotate_condition) { |
| 62 | ERR("Failed to create session consumed size condition object"); |
| 63 | ret = -1; |
| 64 | goto end; |
| 65 | } |
| 66 | |
| 67 | condition_status = |
| 68 | lttng_condition_session_consumed_size_set_threshold(rotate_condition, size); |
| 69 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { |
| 70 | ERR("Could not set session consumed size condition threshold (size = %" PRIu64 ")", |
| 71 | size); |
| 72 | ret = -1; |
| 73 | goto end; |
| 74 | } |
| 75 | |
| 76 | condition_status = lttng_condition_session_consumed_size_set_session_name(rotate_condition, |
| 77 | session->name); |
| 78 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { |
| 79 | ERR("Could not set session consumed size condition session name (name = %s)", |
| 80 | session->name); |
| 81 | ret = -1; |
| 82 | goto end; |
| 83 | } |
| 84 | |
| 85 | notify_action = lttng_action_notify_create(); |
| 86 | if (!notify_action) { |
| 87 | ERR("Could not create notify action"); |
| 88 | ret = -1; |
| 89 | goto end; |
| 90 | } |
| 91 | |
| 92 | LTTNG_ASSERT(!session->rotate_trigger); |
| 93 | session->rotate_trigger = lttng_trigger_create(rotate_condition, notify_action); |
| 94 | if (!session->rotate_trigger) { |
| 95 | ERR("Could not create size-based rotation trigger"); |
| 96 | ret = -1; |
| 97 | goto end; |
| 98 | } |
| 99 | |
| 100 | /* Ensure this trigger is not visible to external users. */ |
| 101 | lttng_trigger_set_hidden(session->rotate_trigger); |
| 102 | lttng_trigger_set_credentials(session->rotate_trigger, &session_creds); |
| 103 | |
| 104 | nc_status = |
| 105 | lttng_notification_channel_subscribe(rotate_notification_channel, rotate_condition); |
| 106 | if (nc_status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) { |
| 107 | ERR("Could not subscribe to session consumed size notification"); |
| 108 | ret = -1; |
| 109 | goto end; |
| 110 | } |
| 111 | |
| 112 | ret = lttng_write(rotate_notification_channel_subscription_change_eventfd, |
| 113 | &eventfd_increment_value, |
| 114 | sizeof(eventfd_increment_value)); |
| 115 | if (ret != sizeof(eventfd_increment_value)) { |
| 116 | PERROR("Failed to wake up rotation thread as writing to the rotation thread notification channel subscription change eventfd failed"); |
| 117 | ret = -1; |
| 118 | goto end; |
| 119 | } |
| 120 | |
| 121 | ret = notification_thread_command_register_trigger( |
| 122 | notification_thread_handle, session->rotate_trigger, true); |
| 123 | if (ret < 0 && ret != -LTTNG_ERR_TRIGGER_EXISTS) { |
| 124 | ERR("Register trigger, %s", lttng_strerror(ret)); |
| 125 | ret = -1; |
| 126 | goto end; |
| 127 | } |
| 128 | |
| 129 | ret = 0; |
| 130 | |
| 131 | end: |
| 132 | lttng_condition_put(rotate_condition); |
| 133 | lttng_action_put(notify_action); |
| 134 | if (ret) { |
| 135 | lttng_trigger_put(session->rotate_trigger); |
| 136 | } |
| 137 | return ret; |
| 138 | } |
| 139 | |
| 140 | int unsubscribe_session_consumed_size_rotation( |
| 141 | struct ltt_session *session, struct notification_thread_handle *notification_thread_handle) |
| 142 | { |
| 143 | int ret = 0; |
| 144 | enum lttng_notification_channel_status status; |
| 145 | const uint64_t eventfd_increment_value = 1; |
| 146 | |
| 147 | LTTNG_ASSERT(session->rotate_trigger); |
| 148 | status = lttng_notification_channel_unsubscribe( |
| 149 | rotate_notification_channel, |
| 150 | lttng_trigger_get_const_condition(session->rotate_trigger)); |
| 151 | if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) { |
| 152 | ERR("Session unsubscribe error: %d", (int) status); |
| 153 | ret = -1; |
| 154 | goto end; |
| 155 | } |
| 156 | |
| 157 | ret = lttng_write(rotate_notification_channel_subscription_change_eventfd, |
| 158 | &eventfd_increment_value, |
| 159 | sizeof(eventfd_increment_value)); |
| 160 | if (ret != sizeof(eventfd_increment_value)) { |
| 161 | PERROR("Failed to wake up rotation thread as writing to the rotation thread notification channel subscription change eventfd failed"); |
| 162 | ret = -1; |
| 163 | goto end; |
| 164 | } |
| 165 | |
| 166 | ret = notification_thread_command_unregister_trigger(notification_thread_handle, |
| 167 | session->rotate_trigger); |
| 168 | if (ret != LTTNG_OK) { |
| 169 | ERR("Session unregister trigger error: %d", ret); |
| 170 | goto end; |
| 171 | } |
| 172 | |
| 173 | lttng_trigger_put(session->rotate_trigger); |
| 174 | session->rotate_trigger = nullptr; |
| 175 | |
| 176 | ret = 0; |
| 177 | end: |
| 178 | return ret; |
| 179 | } |