1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include <sys/epoll.h>
30 #include "unit-name.h"
31 #include "dbus-swap.h"
33 #include "exit-status.h"
34 #include "path-util.h"
36 #include "udev-util.h"
37 #include "fstab-util.h"
39 static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
40 [SWAP_DEAD] = UNIT_INACTIVE,
41 [SWAP_ACTIVATING] = UNIT_ACTIVATING,
42 [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE,
43 [SWAP_ACTIVE] = UNIT_ACTIVE,
44 [SWAP_DEACTIVATING] = UNIT_DEACTIVATING,
45 [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
46 [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
47 [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
48 [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
49 [SWAP_FAILED] = UNIT_FAILED
52 static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
53 static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
55 static void swap_unset_proc_swaps(Swap *s) {
58 if (!s->from_proc_swaps)
61 free(s->parameters_proc_swaps.what);
62 s->parameters_proc_swaps.what = NULL;
64 s->from_proc_swaps = false;
67 static int swap_set_devnode(Swap *s, const char *devnode) {
74 r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &string_hash_ops);
78 swaps = UNIT(s)->manager->swaps_by_devnode;
81 first = hashmap_get(swaps, s->devnode);
83 LIST_REMOVE(same_devnode, first, s);
85 hashmap_replace(swaps, first->devnode, first);
87 hashmap_remove(swaps, s->devnode);
94 s->devnode = strdup(devnode);
98 first = hashmap_get(swaps, s->devnode);
99 LIST_PREPEND(same_devnode, first, s);
101 return hashmap_replace(swaps, first->devnode, first);
107 static void swap_init(Unit *u) {
111 assert(UNIT(s)->load_state == UNIT_STUB);
113 s->timeout_usec = u->manager->default_timeout_start_usec;
115 s->exec_context.std_output = u->manager->default_std_output;
116 s->exec_context.std_error = u->manager->default_std_error;
118 s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1;
120 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
122 u->ignore_on_isolate = true;
125 static void swap_unwatch_control_pid(Swap *s) {
128 if (s->control_pid <= 0)
131 unit_unwatch_pid(UNIT(s), s->control_pid);
135 static void swap_done(Unit *u) {
140 swap_unset_proc_swaps(s);
141 swap_set_devnode(s, NULL);
146 free(s->parameters_fragment.what);
147 s->parameters_fragment.what = NULL;
149 free(s->parameters_fragment.options);
150 s->parameters_fragment.options = NULL;
152 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
153 exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
154 s->control_command = NULL;
156 swap_unwatch_control_pid(s);
158 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
161 static int swap_arm_timer(Swap *s) {
166 if (s->timeout_usec <= 0) {
167 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
171 if (s->timer_event_source) {
172 r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_usec);
176 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
179 return sd_event_add_time(
180 UNIT(s)->manager->event,
181 &s->timer_event_source,
183 now(CLOCK_MONOTONIC) + s->timeout_usec, 0,
184 swap_dispatch_timer, s);
187 static int swap_add_device_links(Swap *s) {
193 if (!s->from_fragment)
196 if (is_device_path(s->what))
197 return unit_add_node_link(UNIT(s), s->what, UNIT(s)->manager->running_as == SYSTEMD_SYSTEM);
199 /* File based swap devices need to be ordered after
200 * systemd-remount-fs.service, since they might need a
201 * writable file system. */
202 return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true);
205 static int swap_add_default_dependencies(Swap *s) {
208 if (UNIT(s)->manager->running_as != SYSTEMD_SYSTEM)
211 if (detect_container(NULL) > 0)
214 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
217 static int swap_verify(Swap *s) {
219 _cleanup_free_ char *e = NULL;
221 if (UNIT(s)->load_state != UNIT_LOADED)
224 e = unit_name_from_path(s->what, ".swap");
228 b = unit_has_name(UNIT(s), e);
230 log_unit_error(UNIT(s)->id, "%s: Value of \"What\" and unit name do not match, not loading.", UNIT(s)->id);
234 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
235 log_unit_error(UNIT(s)->id, "%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load.", UNIT(s)->id);
242 static int swap_load_devnode(Swap *s) {
243 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
249 if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode))
252 d = udev_device_new_from_devnum(UNIT(s)->manager->udev, 'b', st.st_rdev);
256 p = udev_device_get_devnode(d);
260 return swap_set_devnode(s, p);
263 static int swap_load(Unit *u) {
268 assert(u->load_state == UNIT_STUB);
270 /* Load a .swap file */
271 r = unit_load_fragment_and_dropin_optional(u);
275 if (u->load_state == UNIT_LOADED) {
277 if (UNIT(s)->fragment_path)
278 s->from_fragment = true;
281 if (s->parameters_fragment.what)
282 s->what = strdup(s->parameters_fragment.what);
283 else if (s->parameters_proc_swaps.what)
284 s->what = strdup(s->parameters_proc_swaps.what);
286 s->what = unit_name_to_path(u->id);
292 path_kill_slashes(s->what);
294 if (!UNIT(s)->description) {
295 r = unit_set_description(u, s->what);
300 r = unit_require_mounts_for(UNIT(s), s->what);
304 r = swap_add_device_links(s);
308 r = swap_load_devnode(s);
312 r = unit_patch_contexts(u);
316 r = unit_add_exec_dependencies(u, &s->exec_context);
320 r = unit_add_default_slice(u, &s->cgroup_context);
324 if (UNIT(s)->default_dependencies) {
325 r = swap_add_default_dependencies(s);
331 return swap_verify(s);
334 static int swap_setup_unit(
337 const char *what_proc_swaps,
341 _cleanup_free_ char *e = NULL;
349 assert(what_proc_swaps);
351 e = unit_name_from_path(what, ".swap");
355 u = manager_get_unit(m, e);
358 SWAP(u)->from_proc_swaps &&
359 !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) {
360 log_error("Swap %s appeared twice with different device paths %s and %s", e, SWAP(u)->parameters_proc_swaps.what, what_proc_swaps);
367 u = unit_new(m, sizeof(Swap));
371 r = unit_add_name(u, e);
375 SWAP(u)->what = strdup(what);
376 if (!SWAP(u)->what) {
381 unit_add_to_load_queue(u);
385 p = &SWAP(u)->parameters_proc_swaps;
388 p->what = strdup(what_proc_swaps);
396 SWAP(u)->is_active = true;
397 SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps;
400 SWAP(u)->from_proc_swaps = true;
402 p->priority = priority;
404 unit_add_to_dbus_queue(u);
408 log_unit_warning_errno(e, r, "Failed to load swap unit: %m");
416 static int swap_process_new(Manager *m, const char *device, int prio, bool set_flags) {
417 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
418 struct udev_list_entry *item = NULL, *first = NULL;
425 r = swap_setup_unit(m, device, device, prio, set_flags);
429 /* If this is a block device, then let's add duplicates for
430 * all other names of this block device */
431 if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode))
434 d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev);
438 /* Add the main device node */
439 dn = udev_device_get_devnode(d);
440 if (dn && !streq(dn, device))
441 swap_setup_unit(m, dn, device, prio, set_flags);
443 /* Add additional units for all symlinks */
444 first = udev_device_get_devlinks_list_entry(d);
445 udev_list_entry_foreach(item, first) {
448 /* Don't bother with the /dev/block links */
449 p = udev_list_entry_get_name(item);
451 if (streq(p, device))
454 if (path_startswith(p, "/dev/block/"))
457 if (stat(p, &st) >= 0)
458 if (!S_ISBLK(st.st_mode) ||
459 st.st_rdev != udev_device_get_devnum(d))
462 swap_setup_unit(m, p, device, prio, set_flags);
468 static void swap_set_state(Swap *s, SwapState state) {
474 old_state = s->state;
477 if (state != SWAP_ACTIVATING &&
478 state != SWAP_ACTIVATING_SIGTERM &&
479 state != SWAP_ACTIVATING_SIGKILL &&
480 state != SWAP_ACTIVATING_DONE &&
481 state != SWAP_DEACTIVATING &&
482 state != SWAP_DEACTIVATING_SIGTERM &&
483 state != SWAP_DEACTIVATING_SIGKILL) {
484 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
485 swap_unwatch_control_pid(s);
486 s->control_command = NULL;
487 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
490 if (state != old_state)
491 log_unit_debug(UNIT(s)->id,
492 "%s changed %s -> %s",
494 swap_state_to_string(old_state),
495 swap_state_to_string(state));
497 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
499 /* If there other units for the same device node have a job
500 queued it might be worth checking again if it is runnable
501 now. This is necessary, since swap_start() refuses
502 operation with EAGAIN if there's already another job for
503 the same device node queued. */
504 LIST_FOREACH_OTHERS(same_devnode, other, s)
505 if (UNIT(other)->job)
506 job_add_to_run_queue(UNIT(other)->job);
509 static int swap_coldplug(Unit *u) {
511 SwapState new_state = SWAP_DEAD;
515 assert(s->state == SWAP_DEAD);
517 if (s->deserialized_state != s->state)
518 new_state = s->deserialized_state;
519 else if (s->from_proc_swaps)
520 new_state = SWAP_ACTIVE;
522 if (new_state == s->state)
525 if (new_state == SWAP_ACTIVATING ||
526 new_state == SWAP_ACTIVATING_SIGTERM ||
527 new_state == SWAP_ACTIVATING_SIGKILL ||
528 new_state == SWAP_ACTIVATING_DONE ||
529 new_state == SWAP_DEACTIVATING ||
530 new_state == SWAP_DEACTIVATING_SIGTERM ||
531 new_state == SWAP_DEACTIVATING_SIGKILL) {
533 if (s->control_pid <= 0)
536 r = unit_watch_pid(UNIT(s), s->control_pid);
540 r = swap_arm_timer(s);
545 swap_set_state(s, new_state);
549 static void swap_dump(Unit *u, FILE *f, const char *prefix) {
556 if (s->from_proc_swaps)
557 p = &s->parameters_proc_swaps;
558 else if (s->from_fragment)
559 p = &s->parameters_fragment;
567 "%sFrom /proc/swaps: %s\n"
568 "%sFrom fragment: %s\n",
569 prefix, swap_state_to_string(s->state),
570 prefix, swap_result_to_string(s->result),
572 prefix, yes_no(s->from_proc_swaps),
573 prefix, yes_no(s->from_fragment));
576 fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode);
583 prefix, strempty(p->options));
585 if (s->control_pid > 0)
587 "%sControl PID: "PID_FMT"\n",
588 prefix, s->control_pid);
590 exec_context_dump(&s->exec_context, f, prefix);
591 kill_context_dump(&s->kill_context, f, prefix);
594 static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
597 ExecParameters exec_params = {
598 .apply_permissions = true,
599 .apply_chroot = true,
600 .apply_tty_stdin = true,
607 unit_realize_cgroup(UNIT(s));
609 r = unit_setup_exec_runtime(UNIT(s));
613 r = swap_arm_timer(s);
617 exec_params.environment = UNIT(s)->manager->environment;
618 exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn;
619 exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported;
620 exec_params.cgroup_path = UNIT(s)->cgroup_path;
621 exec_params.cgroup_delegate = s->cgroup_context.delegate;
622 exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager);
623 exec_params.unit_id = UNIT(s)->id;
633 r = unit_watch_pid(UNIT(s), pid);
635 /* FIXME: we need to do something here */
643 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
647 static void swap_enter_dead(Swap *s, SwapResult f) {
650 if (f != SWAP_SUCCESS)
653 exec_runtime_destroy(s->exec_runtime);
654 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
656 exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager));
658 swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD);
661 static void swap_enter_active(Swap *s, SwapResult f) {
664 if (f != SWAP_SUCCESS)
667 swap_set_state(s, SWAP_ACTIVE);
670 static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) {
675 if (f != SWAP_SUCCESS)
678 r = unit_kill_context(
681 (state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM) ?
682 KILL_KILL : KILL_TERMINATE,
690 r = swap_arm_timer(s);
694 swap_set_state(s, state);
695 } else if (state == SWAP_ACTIVATING_SIGTERM)
696 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_SUCCESS);
697 else if (state == SWAP_DEACTIVATING_SIGTERM)
698 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS);
700 swap_enter_dead(s, SWAP_SUCCESS);
705 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to kill processes: %m", UNIT(s)->id);
706 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
709 static void swap_enter_activating(Swap *s) {
710 _cleanup_free_ char *discard = NULL;
711 int r, priority = -1;
715 s->control_command_id = SWAP_EXEC_ACTIVATE;
716 s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
718 if (s->from_fragment) {
719 fstab_filter_options(s->parameters_fragment.options, "discard\0",
720 NULL, &discard, NULL);
722 priority = s->parameters_fragment.priority;
724 fstab_find_pri(s->parameters_fragment.options, &priority);
727 r = exec_command_set(s->control_command, "/sbin/swapon", NULL);
732 char p[DECIMAL_STR_MAX(int)];
734 sprintf(p, "%i", priority);
735 r = exec_command_append(s->control_command, "-p", p, NULL);
740 if (discard && !streq(discard, "none")) {
741 const char *discard_arg;
743 if (streq(discard, "all"))
744 discard_arg = "--discard";
746 discard_arg = strjoina("--discard=", discard);
748 r = exec_command_append(s->control_command, discard_arg, NULL);
753 r = exec_command_append(s->control_command, s->what, NULL);
757 swap_unwatch_control_pid(s);
759 r = swap_spawn(s, s->control_command, &s->control_pid);
763 swap_set_state(s, SWAP_ACTIVATING);
768 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to run 'swapon' task: %m", UNIT(s)->id);
769 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
772 static void swap_enter_deactivating(Swap *s) {
777 s->control_command_id = SWAP_EXEC_DEACTIVATE;
778 s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
780 r = exec_command_set(s->control_command,
787 swap_unwatch_control_pid(s);
789 r = swap_spawn(s, s->control_command, &s->control_pid);
793 swap_set_state(s, SWAP_DEACTIVATING);
798 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to run 'swapoff' task: %m", UNIT(s)->id);
799 swap_enter_active(s, SWAP_FAILURE_RESOURCES);
802 static int swap_start(Unit *u) {
803 Swap *s = SWAP(u), *other;
807 /* We cannot fulfill this request right now, try again later
810 if (s->state == SWAP_DEACTIVATING ||
811 s->state == SWAP_DEACTIVATING_SIGTERM ||
812 s->state == SWAP_DEACTIVATING_SIGKILL ||
813 s->state == SWAP_ACTIVATING_SIGTERM ||
814 s->state == SWAP_ACTIVATING_SIGKILL)
817 if (s->state == SWAP_ACTIVATING)
820 assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED);
822 if (detect_container(NULL) > 0)
825 /* If there's a job for another swap unit for the same node
826 * running, then let's not dispatch this one for now, and wait
827 * until that other job has finished. */
828 LIST_FOREACH_OTHERS(same_devnode, other, s)
829 if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING)
832 s->result = SWAP_SUCCESS;
833 swap_enter_activating(s);
837 static int swap_stop(Unit *u) {
842 if (s->state == SWAP_DEACTIVATING ||
843 s->state == SWAP_DEACTIVATING_SIGTERM ||
844 s->state == SWAP_DEACTIVATING_SIGKILL ||
845 s->state == SWAP_ACTIVATING_SIGTERM ||
846 s->state == SWAP_ACTIVATING_SIGKILL)
849 assert(s->state == SWAP_ACTIVATING ||
850 s->state == SWAP_ACTIVATING_DONE ||
851 s->state == SWAP_ACTIVE);
853 if (detect_container(NULL) > 0)
856 swap_enter_deactivating(s);
860 static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
867 unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
868 unit_serialize_item(u, f, "result", swap_result_to_string(s->result));
870 if (s->control_pid > 0)
871 unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid);
873 if (s->control_command_id >= 0)
874 unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id));
879 static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
885 if (streq(key, "state")) {
888 state = swap_state_from_string(value);
890 log_unit_debug(u->id, "Failed to parse state value %s", value);
892 s->deserialized_state = state;
893 } else if (streq(key, "result")) {
896 f = swap_result_from_string(value);
898 log_unit_debug(u->id, "Failed to parse result value %s", value);
899 else if (f != SWAP_SUCCESS)
901 } else if (streq(key, "control-pid")) {
904 if (parse_pid(value, &pid) < 0)
905 log_unit_debug(u->id, "Failed to parse control-pid value %s", value);
907 s->control_pid = pid;
909 } else if (streq(key, "control-command")) {
912 id = swap_exec_command_from_string(value);
914 log_unit_debug(u->id, "Failed to parse exec-command value %s", value);
916 s->control_command_id = id;
917 s->control_command = s->exec_command + id;
920 log_unit_debug(u->id, "Unknown serialization key '%s'", key);
925 _pure_ static UnitActiveState swap_active_state(Unit *u) {
928 return state_translation_table[SWAP(u)->state];
931 _pure_ static const char *swap_sub_state_to_string(Unit *u) {
934 return swap_state_to_string(SWAP(u)->state);
937 _pure_ static bool swap_check_gc(Unit *u) {
942 return s->from_proc_swaps;
945 static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
952 if (pid != s->control_pid)
957 if (is_clean_exit(code, status, NULL))
959 else if (code == CLD_EXITED)
960 f = SWAP_FAILURE_EXIT_CODE;
961 else if (code == CLD_KILLED)
962 f = SWAP_FAILURE_SIGNAL;
963 else if (code == CLD_DUMPED)
964 f = SWAP_FAILURE_CORE_DUMP;
966 assert_not_reached("Unknown code");
968 if (f != SWAP_SUCCESS)
971 if (s->control_command) {
972 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
974 s->control_command = NULL;
975 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
979 f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
980 "%s swap process exited, code=%s status=%i",
981 u->id, sigchld_code_to_string(code), status);
985 case SWAP_ACTIVATING:
986 case SWAP_ACTIVATING_DONE:
987 case SWAP_ACTIVATING_SIGTERM:
988 case SWAP_ACTIVATING_SIGKILL:
990 if (f == SWAP_SUCCESS)
991 swap_enter_active(s, f);
993 swap_enter_dead(s, f);
996 case SWAP_DEACTIVATING:
997 case SWAP_DEACTIVATING_SIGKILL:
998 case SWAP_DEACTIVATING_SIGTERM:
1000 swap_enter_dead(s, f);
1004 assert_not_reached("Uh, control process died at wrong time.");
1007 /* Notify clients about changed exit status */
1008 unit_add_to_dbus_queue(u);
1011 static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1012 Swap *s = SWAP(userdata);
1015 assert(s->timer_event_source == source);
1019 case SWAP_ACTIVATING:
1020 case SWAP_ACTIVATING_DONE:
1021 log_unit_warning(UNIT(s)->id, "%s activation timed out. Stopping.", UNIT(s)->id);
1022 swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1025 case SWAP_DEACTIVATING:
1026 log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Stopping.", UNIT(s)->id);
1027 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1030 case SWAP_ACTIVATING_SIGTERM:
1031 if (s->kill_context.send_sigkill) {
1032 log_unit_warning(UNIT(s)->id, "%s activation timed out. Killing.", UNIT(s)->id);
1033 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1035 log_unit_warning(UNIT(s)->id, "%s activation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
1036 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1040 case SWAP_DEACTIVATING_SIGTERM:
1041 if (s->kill_context.send_sigkill) {
1042 log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Killing.", UNIT(s)->id);
1043 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1045 log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
1046 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1050 case SWAP_ACTIVATING_SIGKILL:
1051 case SWAP_DEACTIVATING_SIGKILL:
1052 log_unit_warning(UNIT(s)->id, "%s swap process still around after SIGKILL. Ignoring.", UNIT(s)->id);
1053 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1057 assert_not_reached("Timeout at wrong time.");
1063 static int swap_load_proc_swaps(Manager *m, bool set_flags) {
1069 rewind(m->proc_swaps);
1071 (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
1074 _cleanup_free_ char *dev = NULL, *d = NULL;
1077 k = fscanf(m->proc_swaps,
1078 "%ms " /* device/file */
1079 "%*s " /* type of swap */
1080 "%*s " /* swap size */
1082 "%i\n", /* priority */
1088 log_warning("Failed to parse /proc/swaps:%u.", i);
1096 device_found_node(m, d, true, DEVICE_FOUND_SWAP, set_flags);
1098 k = swap_process_new(m, d, prio, set_flags);
1106 static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1107 Manager *m = userdata;
1112 assert(revents & EPOLLPRI);
1114 r = swap_load_proc_swaps(m, true);
1116 log_error_errno(r, "Failed to reread /proc/swaps: %m");
1118 /* Reset flags, just in case, for late calls */
1119 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1120 Swap *swap = SWAP(u);
1122 swap->is_active = swap->just_activated = false;
1128 manager_dispatch_load_queue(m);
1130 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1131 Swap *swap = SWAP(u);
1133 if (!swap->is_active) {
1134 /* This has just been deactivated */
1136 swap_unset_proc_swaps(swap);
1138 switch (swap->state) {
1141 swap_enter_dead(swap, SWAP_SUCCESS);
1146 swap_set_state(swap, swap->state);
1151 device_found_node(m, swap->what, false, DEVICE_FOUND_SWAP, true);
1153 } else if (swap->just_activated) {
1155 /* New swap entry */
1157 switch (swap->state) {
1161 swap_enter_active(swap, SWAP_SUCCESS);
1164 case SWAP_ACTIVATING:
1165 swap_set_state(swap, SWAP_ACTIVATING_DONE);
1169 /* Nothing really changed, but let's
1170 * issue an notification call
1171 * nonetheless, in case somebody is
1172 * waiting for this. */
1173 swap_set_state(swap, swap->state);
1178 /* Reset the flags for later calls */
1179 swap->is_active = swap->just_activated = false;
1185 static Unit *swap_following(Unit *u) {
1187 Swap *other, *first = NULL;
1191 /* If the user configured the swap through /etc/fstab or
1192 * a device unit, follow that. */
1194 if (s->from_fragment)
1197 LIST_FOREACH_OTHERS(same_devnode, other, s)
1198 if (other->from_fragment)
1201 /* Otherwise make everybody follow the unit that's named after
1202 * the swap device in the kernel */
1204 if (streq_ptr(s->what, s->devnode))
1207 LIST_FOREACH_AFTER(same_devnode, other, s)
1208 if (streq_ptr(other->what, other->devnode))
1211 LIST_FOREACH_BEFORE(same_devnode, other, s) {
1212 if (streq_ptr(other->what, other->devnode))
1218 /* Fall back to the first on the list */
1222 static int swap_following_set(Unit *u, Set **_set) {
1223 Swap *s = SWAP(u), *other;
1230 if (LIST_JUST_US(same_devnode, s)) {
1235 set = set_new(NULL);
1239 LIST_FOREACH_OTHERS(same_devnode, other, s) {
1240 r = set_put(set, other);
1253 static void swap_shutdown(Manager *m) {
1256 m->swap_event_source = sd_event_source_unref(m->swap_event_source);
1258 if (m->proc_swaps) {
1259 fclose(m->proc_swaps);
1260 m->proc_swaps = NULL;
1263 hashmap_free(m->swaps_by_devnode);
1264 m->swaps_by_devnode = NULL;
1267 static int swap_enumerate(Manager *m) {
1272 if (!m->proc_swaps) {
1273 m->proc_swaps = fopen("/proc/swaps", "re");
1275 return errno == ENOENT ? 0 : -errno;
1277 r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m);
1281 /* Dispatch this before we dispatch SIGCHLD, so that
1282 * we always get the events from /proc/swaps before
1283 * the SIGCHLD of /sbin/swapon. */
1284 r = sd_event_source_set_priority(m->swap_event_source, -10);
1289 r = swap_load_proc_swaps(m, false);
1300 int swap_process_device_new(Manager *m, struct udev_device *dev) {
1301 struct udev_list_entry *item = NULL, *first = NULL;
1302 _cleanup_free_ char *e = NULL;
1310 dn = udev_device_get_devnode(dev);
1314 e = unit_name_from_path(dn, ".swap");
1318 s = hashmap_get(m->units, e);
1320 r = swap_set_devnode(s, dn);
1322 first = udev_device_get_devlinks_list_entry(dev);
1323 udev_list_entry_foreach(item, first) {
1324 _cleanup_free_ char *n = NULL;
1326 n = unit_name_from_path(udev_list_entry_get_name(item), ".swap");
1330 s = hashmap_get(m->units, n);
1334 q = swap_set_devnode(s, dn);
1343 int swap_process_device_remove(Manager *m, struct udev_device *dev) {
1348 dn = udev_device_get_devnode(dev);
1352 while ((s = hashmap_get(m->swaps_by_devnode, dn))) {
1355 q = swap_set_devnode(s, NULL);
1363 static void swap_reset_failed(Unit *u) {
1368 if (s->state == SWAP_FAILED)
1369 swap_set_state(s, SWAP_DEAD);
1371 s->result = SWAP_SUCCESS;
1374 static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1375 return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error);
1378 static int swap_get_timeout(Unit *u, uint64_t *timeout) {
1382 if (!s->timer_event_source)
1385 r = sd_event_source_get_time(s->timer_event_source, timeout);
1392 static bool swap_supported(Manager *m) {
1393 static int supported = -1;
1395 /* If swap support is not available in the kernel, or we are
1396 * running in a container we don't support swap units, and any
1397 * attempts to starting one should fail immediately. */
1401 access("/proc/swaps", F_OK) >= 0 &&
1402 detect_container(NULL) <= 0;
1407 static const char* const swap_state_table[_SWAP_STATE_MAX] = {
1408 [SWAP_DEAD] = "dead",
1409 [SWAP_ACTIVATING] = "activating",
1410 [SWAP_ACTIVATING_DONE] = "activating-done",
1411 [SWAP_ACTIVE] = "active",
1412 [SWAP_DEACTIVATING] = "deactivating",
1413 [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm",
1414 [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill",
1415 [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm",
1416 [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill",
1417 [SWAP_FAILED] = "failed"
1420 DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
1422 static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
1423 [SWAP_EXEC_ACTIVATE] = "ExecActivate",
1424 [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
1427 DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
1429 static const char* const swap_result_table[_SWAP_RESULT_MAX] = {
1430 [SWAP_SUCCESS] = "success",
1431 [SWAP_FAILURE_RESOURCES] = "resources",
1432 [SWAP_FAILURE_TIMEOUT] = "timeout",
1433 [SWAP_FAILURE_EXIT_CODE] = "exit-code",
1434 [SWAP_FAILURE_SIGNAL] = "signal",
1435 [SWAP_FAILURE_CORE_DUMP] = "core-dump"
1438 DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult);
1440 const UnitVTable swap_vtable = {
1441 .object_size = sizeof(Swap),
1442 .exec_context_offset = offsetof(Swap, exec_context),
1443 .cgroup_context_offset = offsetof(Swap, cgroup_context),
1444 .kill_context_offset = offsetof(Swap, kill_context),
1445 .exec_runtime_offset = offsetof(Swap, exec_runtime),
1451 .private_section = "Swap",
1454 .no_instances = true,
1460 .coldplug = swap_coldplug,
1464 .start = swap_start,
1469 .get_timeout = swap_get_timeout,
1471 .serialize = swap_serialize,
1472 .deserialize_item = swap_deserialize_item,
1474 .active_state = swap_active_state,
1475 .sub_state_to_string = swap_sub_state_to_string,
1477 .check_gc = swap_check_gc,
1479 .sigchld_event = swap_sigchld_event,
1481 .reset_failed = swap_reset_failed,
1483 .bus_interface = "org.freedesktop.systemd1.Swap",
1484 .bus_vtable = bus_swap_vtable,
1485 .bus_set_property = bus_swap_set_property,
1486 .bus_commit_properties = bus_swap_commit_properties,
1488 .following = swap_following,
1489 .following_set = swap_following_set,
1491 .enumerate = swap_enumerate,
1492 .shutdown = swap_shutdown,
1493 .supported = swap_supported,
1495 .status_message_formats = {
1496 .starting_stopping = {
1497 [0] = "Activating swap %s...",
1498 [1] = "Deactivating swap %s...",
1500 .finished_start_job = {
1501 [JOB_DONE] = "Activated swap %s.",
1502 [JOB_FAILED] = "Failed to activate swap %s.",
1503 [JOB_DEPENDENCY] = "Dependency failed for %s.",
1504 [JOB_TIMEOUT] = "Timed out activating swap %s.",
1506 .finished_stop_job = {
1507 [JOB_DONE] = "Deactivated swap %s.",
1508 [JOB_FAILED] = "Failed deactivating swap %s.",
1509 [JOB_TIMEOUT] = "Timed out deactivating swap %s.",