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 (void) unit_realize_cgroup(UNIT(s));
608 if (s->reset_cpu_usage) {
609 (void) unit_reset_cpu_usage(UNIT(s));
610 s->reset_cpu_usage = false;
613 r = unit_setup_exec_runtime(UNIT(s));
617 r = swap_arm_timer(s);
621 exec_params.environment = UNIT(s)->manager->environment;
622 exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn;
623 exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported;
624 exec_params.cgroup_path = UNIT(s)->cgroup_path;
625 exec_params.cgroup_delegate = s->cgroup_context.delegate;
626 exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager);
627 exec_params.unit_id = UNIT(s)->id;
637 r = unit_watch_pid(UNIT(s), pid);
639 /* FIXME: we need to do something here */
647 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
651 static void swap_enter_dead(Swap *s, SwapResult f) {
654 if (f != SWAP_SUCCESS)
657 exec_runtime_destroy(s->exec_runtime);
658 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
660 exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager));
662 swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD);
665 static void swap_enter_active(Swap *s, SwapResult f) {
668 if (f != SWAP_SUCCESS)
671 swap_set_state(s, SWAP_ACTIVE);
674 static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) {
679 if (f != SWAP_SUCCESS)
682 r = unit_kill_context(
685 (state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM) ?
686 KILL_KILL : KILL_TERMINATE,
694 r = swap_arm_timer(s);
698 swap_set_state(s, state);
699 } else if (state == SWAP_ACTIVATING_SIGTERM)
700 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_SUCCESS);
701 else if (state == SWAP_DEACTIVATING_SIGTERM)
702 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS);
704 swap_enter_dead(s, SWAP_SUCCESS);
709 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to kill processes: %m", UNIT(s)->id);
710 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
713 static void swap_enter_activating(Swap *s) {
714 _cleanup_free_ char *discard = NULL;
715 int r, priority = -1;
719 s->control_command_id = SWAP_EXEC_ACTIVATE;
720 s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
722 if (s->from_fragment) {
723 fstab_filter_options(s->parameters_fragment.options, "discard\0",
724 NULL, &discard, NULL);
726 priority = s->parameters_fragment.priority;
728 fstab_find_pri(s->parameters_fragment.options, &priority);
731 r = exec_command_set(s->control_command, "/sbin/swapon", NULL);
736 char p[DECIMAL_STR_MAX(int)];
738 sprintf(p, "%i", priority);
739 r = exec_command_append(s->control_command, "-p", p, NULL);
744 if (discard && !streq(discard, "none")) {
745 const char *discard_arg;
747 if (streq(discard, "all"))
748 discard_arg = "--discard";
750 discard_arg = strjoina("--discard=", discard);
752 r = exec_command_append(s->control_command, discard_arg, NULL);
757 r = exec_command_append(s->control_command, s->what, NULL);
761 swap_unwatch_control_pid(s);
763 r = swap_spawn(s, s->control_command, &s->control_pid);
767 swap_set_state(s, SWAP_ACTIVATING);
772 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to run 'swapon' task: %m", UNIT(s)->id);
773 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
776 static void swap_enter_deactivating(Swap *s) {
781 s->control_command_id = SWAP_EXEC_DEACTIVATE;
782 s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
784 r = exec_command_set(s->control_command,
791 swap_unwatch_control_pid(s);
793 r = swap_spawn(s, s->control_command, &s->control_pid);
797 swap_set_state(s, SWAP_DEACTIVATING);
802 log_unit_warning_errno(UNIT(s)->id, r, "%s failed to run 'swapoff' task: %m", UNIT(s)->id);
803 swap_enter_active(s, SWAP_FAILURE_RESOURCES);
806 static int swap_start(Unit *u) {
807 Swap *s = SWAP(u), *other;
811 /* We cannot fulfill this request right now, try again later
814 if (s->state == SWAP_DEACTIVATING ||
815 s->state == SWAP_DEACTIVATING_SIGTERM ||
816 s->state == SWAP_DEACTIVATING_SIGKILL ||
817 s->state == SWAP_ACTIVATING_SIGTERM ||
818 s->state == SWAP_ACTIVATING_SIGKILL)
821 if (s->state == SWAP_ACTIVATING)
824 assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED);
826 if (detect_container(NULL) > 0)
829 /* If there's a job for another swap unit for the same node
830 * running, then let's not dispatch this one for now, and wait
831 * until that other job has finished. */
832 LIST_FOREACH_OTHERS(same_devnode, other, s)
833 if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING)
836 s->result = SWAP_SUCCESS;
837 s->reset_cpu_usage = true;
839 swap_enter_activating(s);
843 static int swap_stop(Unit *u) {
848 if (s->state == SWAP_DEACTIVATING ||
849 s->state == SWAP_DEACTIVATING_SIGTERM ||
850 s->state == SWAP_DEACTIVATING_SIGKILL ||
851 s->state == SWAP_ACTIVATING_SIGTERM ||
852 s->state == SWAP_ACTIVATING_SIGKILL)
855 assert(s->state == SWAP_ACTIVATING ||
856 s->state == SWAP_ACTIVATING_DONE ||
857 s->state == SWAP_ACTIVE);
859 if (detect_container(NULL) > 0)
862 swap_enter_deactivating(s);
866 static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
873 unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
874 unit_serialize_item(u, f, "result", swap_result_to_string(s->result));
876 if (s->control_pid > 0)
877 unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid);
879 if (s->control_command_id >= 0)
880 unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id));
885 static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
891 if (streq(key, "state")) {
894 state = swap_state_from_string(value);
896 log_unit_debug(u->id, "Failed to parse state value %s", value);
898 s->deserialized_state = state;
899 } else if (streq(key, "result")) {
902 f = swap_result_from_string(value);
904 log_unit_debug(u->id, "Failed to parse result value %s", value);
905 else if (f != SWAP_SUCCESS)
907 } else if (streq(key, "control-pid")) {
910 if (parse_pid(value, &pid) < 0)
911 log_unit_debug(u->id, "Failed to parse control-pid value %s", value);
913 s->control_pid = pid;
915 } else if (streq(key, "control-command")) {
918 id = swap_exec_command_from_string(value);
920 log_unit_debug(u->id, "Failed to parse exec-command value %s", value);
922 s->control_command_id = id;
923 s->control_command = s->exec_command + id;
926 log_unit_debug(u->id, "Unknown serialization key '%s'", key);
931 _pure_ static UnitActiveState swap_active_state(Unit *u) {
934 return state_translation_table[SWAP(u)->state];
937 _pure_ static const char *swap_sub_state_to_string(Unit *u) {
940 return swap_state_to_string(SWAP(u)->state);
943 _pure_ static bool swap_check_gc(Unit *u) {
948 return s->from_proc_swaps;
951 static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
958 if (pid != s->control_pid)
963 if (is_clean_exit(code, status, NULL))
965 else if (code == CLD_EXITED)
966 f = SWAP_FAILURE_EXIT_CODE;
967 else if (code == CLD_KILLED)
968 f = SWAP_FAILURE_SIGNAL;
969 else if (code == CLD_DUMPED)
970 f = SWAP_FAILURE_CORE_DUMP;
972 assert_not_reached("Unknown code");
974 if (f != SWAP_SUCCESS)
977 if (s->control_command) {
978 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
980 s->control_command = NULL;
981 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
985 f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
986 "%s swap process exited, code=%s status=%i",
987 u->id, sigchld_code_to_string(code), status);
991 case SWAP_ACTIVATING:
992 case SWAP_ACTIVATING_DONE:
993 case SWAP_ACTIVATING_SIGTERM:
994 case SWAP_ACTIVATING_SIGKILL:
996 if (f == SWAP_SUCCESS)
997 swap_enter_active(s, f);
999 swap_enter_dead(s, f);
1002 case SWAP_DEACTIVATING:
1003 case SWAP_DEACTIVATING_SIGKILL:
1004 case SWAP_DEACTIVATING_SIGTERM:
1006 swap_enter_dead(s, f);
1010 assert_not_reached("Uh, control process died at wrong time.");
1013 /* Notify clients about changed exit status */
1014 unit_add_to_dbus_queue(u);
1017 static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1018 Swap *s = SWAP(userdata);
1021 assert(s->timer_event_source == source);
1025 case SWAP_ACTIVATING:
1026 case SWAP_ACTIVATING_DONE:
1027 log_unit_warning(UNIT(s)->id, "%s activation timed out. Stopping.", UNIT(s)->id);
1028 swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1031 case SWAP_DEACTIVATING:
1032 log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Stopping.", UNIT(s)->id);
1033 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1036 case SWAP_ACTIVATING_SIGTERM:
1037 if (s->kill_context.send_sigkill) {
1038 log_unit_warning(UNIT(s)->id, "%s activation timed out. Killing.", UNIT(s)->id);
1039 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1041 log_unit_warning(UNIT(s)->id, "%s activation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
1042 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1046 case SWAP_DEACTIVATING_SIGTERM:
1047 if (s->kill_context.send_sigkill) {
1048 log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Killing.", UNIT(s)->id);
1049 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1051 log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
1052 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1056 case SWAP_ACTIVATING_SIGKILL:
1057 case SWAP_DEACTIVATING_SIGKILL:
1058 log_unit_warning(UNIT(s)->id, "%s swap process still around after SIGKILL. Ignoring.", UNIT(s)->id);
1059 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1063 assert_not_reached("Timeout at wrong time.");
1069 static int swap_load_proc_swaps(Manager *m, bool set_flags) {
1075 rewind(m->proc_swaps);
1077 (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
1080 _cleanup_free_ char *dev = NULL, *d = NULL;
1083 k = fscanf(m->proc_swaps,
1084 "%ms " /* device/file */
1085 "%*s " /* type of swap */
1086 "%*s " /* swap size */
1088 "%i\n", /* priority */
1094 log_warning("Failed to parse /proc/swaps:%u.", i);
1102 device_found_node(m, d, true, DEVICE_FOUND_SWAP, set_flags);
1104 k = swap_process_new(m, d, prio, set_flags);
1112 static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1113 Manager *m = userdata;
1118 assert(revents & EPOLLPRI);
1120 r = swap_load_proc_swaps(m, true);
1122 log_error_errno(r, "Failed to reread /proc/swaps: %m");
1124 /* Reset flags, just in case, for late calls */
1125 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1126 Swap *swap = SWAP(u);
1128 swap->is_active = swap->just_activated = false;
1134 manager_dispatch_load_queue(m);
1136 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1137 Swap *swap = SWAP(u);
1139 if (!swap->is_active) {
1140 /* This has just been deactivated */
1142 swap_unset_proc_swaps(swap);
1144 switch (swap->state) {
1147 swap_enter_dead(swap, SWAP_SUCCESS);
1152 swap_set_state(swap, swap->state);
1157 device_found_node(m, swap->what, false, DEVICE_FOUND_SWAP, true);
1159 } else if (swap->just_activated) {
1161 /* New swap entry */
1163 switch (swap->state) {
1167 swap_enter_active(swap, SWAP_SUCCESS);
1170 case SWAP_ACTIVATING:
1171 swap_set_state(swap, SWAP_ACTIVATING_DONE);
1175 /* Nothing really changed, but let's
1176 * issue an notification call
1177 * nonetheless, in case somebody is
1178 * waiting for this. */
1179 swap_set_state(swap, swap->state);
1184 /* Reset the flags for later calls */
1185 swap->is_active = swap->just_activated = false;
1191 static Unit *swap_following(Unit *u) {
1193 Swap *other, *first = NULL;
1197 /* If the user configured the swap through /etc/fstab or
1198 * a device unit, follow that. */
1200 if (s->from_fragment)
1203 LIST_FOREACH_OTHERS(same_devnode, other, s)
1204 if (other->from_fragment)
1207 /* Otherwise make everybody follow the unit that's named after
1208 * the swap device in the kernel */
1210 if (streq_ptr(s->what, s->devnode))
1213 LIST_FOREACH_AFTER(same_devnode, other, s)
1214 if (streq_ptr(other->what, other->devnode))
1217 LIST_FOREACH_BEFORE(same_devnode, other, s) {
1218 if (streq_ptr(other->what, other->devnode))
1224 /* Fall back to the first on the list */
1228 static int swap_following_set(Unit *u, Set **_set) {
1229 Swap *s = SWAP(u), *other;
1236 if (LIST_JUST_US(same_devnode, s)) {
1241 set = set_new(NULL);
1245 LIST_FOREACH_OTHERS(same_devnode, other, s) {
1246 r = set_put(set, other);
1259 static void swap_shutdown(Manager *m) {
1262 m->swap_event_source = sd_event_source_unref(m->swap_event_source);
1264 if (m->proc_swaps) {
1265 fclose(m->proc_swaps);
1266 m->proc_swaps = NULL;
1269 hashmap_free(m->swaps_by_devnode);
1270 m->swaps_by_devnode = NULL;
1273 static int swap_enumerate(Manager *m) {
1278 if (!m->proc_swaps) {
1279 m->proc_swaps = fopen("/proc/swaps", "re");
1281 return errno == ENOENT ? 0 : -errno;
1283 r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m);
1287 /* Dispatch this before we dispatch SIGCHLD, so that
1288 * we always get the events from /proc/swaps before
1289 * the SIGCHLD of /sbin/swapon. */
1290 r = sd_event_source_set_priority(m->swap_event_source, -10);
1295 r = swap_load_proc_swaps(m, false);
1306 int swap_process_device_new(Manager *m, struct udev_device *dev) {
1307 struct udev_list_entry *item = NULL, *first = NULL;
1308 _cleanup_free_ char *e = NULL;
1316 dn = udev_device_get_devnode(dev);
1320 e = unit_name_from_path(dn, ".swap");
1324 s = hashmap_get(m->units, e);
1326 r = swap_set_devnode(s, dn);
1328 first = udev_device_get_devlinks_list_entry(dev);
1329 udev_list_entry_foreach(item, first) {
1330 _cleanup_free_ char *n = NULL;
1332 n = unit_name_from_path(udev_list_entry_get_name(item), ".swap");
1336 s = hashmap_get(m->units, n);
1340 q = swap_set_devnode(s, dn);
1349 int swap_process_device_remove(Manager *m, struct udev_device *dev) {
1354 dn = udev_device_get_devnode(dev);
1358 while ((s = hashmap_get(m->swaps_by_devnode, dn))) {
1361 q = swap_set_devnode(s, NULL);
1369 static void swap_reset_failed(Unit *u) {
1374 if (s->state == SWAP_FAILED)
1375 swap_set_state(s, SWAP_DEAD);
1377 s->result = SWAP_SUCCESS;
1380 static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1381 return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error);
1384 static int swap_get_timeout(Unit *u, uint64_t *timeout) {
1388 if (!s->timer_event_source)
1391 r = sd_event_source_get_time(s->timer_event_source, timeout);
1398 static bool swap_supported(Manager *m) {
1399 static int supported = -1;
1401 /* If swap support is not available in the kernel, or we are
1402 * running in a container we don't support swap units, and any
1403 * attempts to starting one should fail immediately. */
1407 access("/proc/swaps", F_OK) >= 0 &&
1408 detect_container(NULL) <= 0;
1413 static const char* const swap_state_table[_SWAP_STATE_MAX] = {
1414 [SWAP_DEAD] = "dead",
1415 [SWAP_ACTIVATING] = "activating",
1416 [SWAP_ACTIVATING_DONE] = "activating-done",
1417 [SWAP_ACTIVE] = "active",
1418 [SWAP_DEACTIVATING] = "deactivating",
1419 [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm",
1420 [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill",
1421 [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm",
1422 [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill",
1423 [SWAP_FAILED] = "failed"
1426 DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
1428 static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
1429 [SWAP_EXEC_ACTIVATE] = "ExecActivate",
1430 [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
1433 DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
1435 static const char* const swap_result_table[_SWAP_RESULT_MAX] = {
1436 [SWAP_SUCCESS] = "success",
1437 [SWAP_FAILURE_RESOURCES] = "resources",
1438 [SWAP_FAILURE_TIMEOUT] = "timeout",
1439 [SWAP_FAILURE_EXIT_CODE] = "exit-code",
1440 [SWAP_FAILURE_SIGNAL] = "signal",
1441 [SWAP_FAILURE_CORE_DUMP] = "core-dump"
1444 DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult);
1446 const UnitVTable swap_vtable = {
1447 .object_size = sizeof(Swap),
1448 .exec_context_offset = offsetof(Swap, exec_context),
1449 .cgroup_context_offset = offsetof(Swap, cgroup_context),
1450 .kill_context_offset = offsetof(Swap, kill_context),
1451 .exec_runtime_offset = offsetof(Swap, exec_runtime),
1457 .private_section = "Swap",
1460 .no_instances = true,
1466 .coldplug = swap_coldplug,
1470 .start = swap_start,
1475 .get_timeout = swap_get_timeout,
1477 .serialize = swap_serialize,
1478 .deserialize_item = swap_deserialize_item,
1480 .active_state = swap_active_state,
1481 .sub_state_to_string = swap_sub_state_to_string,
1483 .check_gc = swap_check_gc,
1485 .sigchld_event = swap_sigchld_event,
1487 .reset_failed = swap_reset_failed,
1489 .bus_interface = "org.freedesktop.systemd1.Swap",
1490 .bus_vtable = bus_swap_vtable,
1491 .bus_set_property = bus_swap_set_property,
1492 .bus_commit_properties = bus_swap_commit_properties,
1494 .following = swap_following,
1495 .following_set = swap_following_set,
1497 .enumerate = swap_enumerate,
1498 .shutdown = swap_shutdown,
1499 .supported = swap_supported,
1501 .status_message_formats = {
1502 .starting_stopping = {
1503 [0] = "Activating swap %s...",
1504 [1] = "Deactivating swap %s...",
1506 .finished_start_job = {
1507 [JOB_DONE] = "Activated swap %s.",
1508 [JOB_FAILED] = "Failed to activate swap %s.",
1509 [JOB_DEPENDENCY] = "Dependency failed for %s.",
1510 [JOB_TIMEOUT] = "Timed out activating swap %s.",
1512 .finished_stop_job = {
1513 [JOB_DONE] = "Deactivated swap %s.",
1514 [JOB_FAILED] = "Failed deactivating swap %s.",
1515 [JOB_TIMEOUT] = "Timed out deactivating swap %s.",