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 General Public License as published by
10 the Free Software Foundation; either version 2 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 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include <sys/epoll.h>
33 #include "load-fragment.h"
34 #include "load-dropin.h"
35 #include "unit-name.h"
36 #include "dbus-swap.h"
38 #include "bus-errors.h"
39 #include "exit-status.h"
41 static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
42 [SWAP_DEAD] = UNIT_INACTIVE,
43 [SWAP_ACTIVATING] = UNIT_ACTIVATING,
44 [SWAP_ACTIVE] = UNIT_ACTIVE,
45 [SWAP_DEACTIVATING] = UNIT_DEACTIVATING,
46 [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
47 [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
48 [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
49 [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
50 [SWAP_FAILED] = UNIT_FAILED
53 static void swap_unset_proc_swaps(Swap *s) {
58 if (!s->parameters_proc_swaps.what)
61 /* Remove this unit from the chain of swaps which share the
62 * same kernel swap device. */
64 first = hashmap_get(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what);
65 LIST_REMOVE(Swap, same_proc_swaps, first, s);
68 hashmap_remove_and_replace(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first);
70 hashmap_remove(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what);
72 free(s->parameters_proc_swaps.what);
73 s->parameters_proc_swaps.what = NULL;
76 static void swap_init(Unit *u) {
80 assert(s->meta.load_state == UNIT_STUB);
82 s->timeout_usec = DEFAULT_TIMEOUT_USEC;
84 exec_context_init(&s->exec_context);
86 s->parameters_etc_fstab.priority = s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1;
88 s->timer_watch.type = WATCH_INVALID;
90 s->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
93 static void swap_unwatch_control_pid(Swap *s) {
96 if (s->control_pid <= 0)
99 unit_unwatch_pid(UNIT(s), s->control_pid);
103 static void swap_done(Unit *u) {
108 swap_unset_proc_swaps(s);
113 free(s->parameters_etc_fstab.what);
114 free(s->parameters_fragment.what);
115 s->parameters_etc_fstab.what = s->parameters_fragment.what = NULL;
117 exec_context_done(&s->exec_context);
118 exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
119 s->control_command = NULL;
121 swap_unwatch_control_pid(s);
123 unit_unwatch_timer(u, &s->timer_watch);
126 int swap_add_one_mount_link(Swap *s, Mount *m) {
132 if (s->meta.load_state != UNIT_LOADED ||
133 m->meta.load_state != UNIT_LOADED)
136 if (is_device_path(s->what))
139 if (!path_startswith(s->what, m->where))
142 if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
148 static int swap_add_mount_links(Swap *s) {
154 LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
155 if ((r = swap_add_one_mount_link(s, (Mount*) other)) < 0)
161 static int swap_add_target_links(Swap *s) {
168 if (s->from_fragment)
169 p = &s->parameters_fragment;
170 else if (s->from_etc_fstab)
171 p = &s->parameters_etc_fstab;
175 if ((r = manager_load_unit(s->meta.manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0)
179 (p->handle || s->meta.manager->swap_auto) &&
181 s->meta.manager->running_as == MANAGER_SYSTEM)
182 if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 0)
185 return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true);
188 static int swap_add_device_links(Swap *s) {
196 if (s->from_fragment)
197 p = &s->parameters_fragment;
198 else if (s->from_etc_fstab)
199 p = &s->parameters_etc_fstab;
203 if (is_device_path(s->what))
204 return unit_add_node_link(UNIT(s), s->what,
205 !p->noauto && p->nofail &&
206 s->meta.manager->running_as == MANAGER_SYSTEM);
208 /* File based swap devices need to be ordered after
209 * remount-rootfs.service, since they might need a
210 * writable file system. */
211 return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_ROOTFS_SERVICE, NULL, true);
214 static int swap_add_default_dependencies(Swap *s) {
219 if (s->meta.manager->running_as == MANAGER_SYSTEM) {
221 if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
228 static int swap_verify(Swap *s) {
232 if (s->meta.load_state != UNIT_LOADED)
235 if (!(e = unit_name_from_path(s->what, ".swap")))
238 b = unit_has_name(UNIT(s), e);
242 log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", s->meta.id);
246 if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
247 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id);
254 static int swap_load(Unit *u) {
259 assert(u->meta.load_state == UNIT_STUB);
261 /* Load a .swap file */
262 if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
265 if (u->meta.load_state == UNIT_LOADED) {
267 if (s->meta.fragment_path)
268 s->from_fragment = true;
271 if (s->parameters_fragment.what)
272 s->what = strdup(s->parameters_fragment.what);
273 else if (s->parameters_etc_fstab.what)
274 s->what = strdup(s->parameters_etc_fstab.what);
275 else if (s->parameters_proc_swaps.what)
276 s->what = strdup(s->parameters_proc_swaps.what);
278 s->what = unit_name_to_path(u->meta.id);
284 path_kill_slashes(s->what);
286 if (!s->meta.description)
287 if ((r = unit_set_description(u, s->what)) < 0)
290 if ((r = swap_add_device_links(s)) < 0)
293 if ((r = swap_add_mount_links(s)) < 0)
296 if ((r = swap_add_target_links(s)) < 0)
299 if ((r = unit_add_default_cgroups(u)) < 0)
302 if (s->meta.default_dependencies)
303 if ((r = swap_add_default_dependencies(s)) < 0)
307 return swap_verify(s);
313 const char *what_proc_swaps,
321 char *e = NULL, *wp = NULL;
329 if (!(e = unit_name_from_path(what, ".swap")))
332 u = manager_get_unit(m, e);
334 if (what_proc_swaps &&
336 SWAP(u)->from_proc_swaps &&
337 !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps))
343 if (!(u = unit_new(m))) {
348 if ((r = unit_add_name(u, e)) < 0)
351 if (!(SWAP(u)->what = strdup(what))) {
356 unit_add_to_load_queue(u);
360 if (what_proc_swaps) {
363 p = &SWAP(u)->parameters_proc_swaps;
366 if (!(wp = strdup(what_proc_swaps))) {
371 if (!m->swaps_by_proc_swaps)
372 if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) {
380 first = hashmap_get(m->swaps_by_proc_swaps, wp);
381 LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u));
383 if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 0)
388 SWAP(u)->is_active = true;
389 SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps;
392 SWAP(u)->from_proc_swaps = true;
395 p = &SWAP(u)->parameters_etc_fstab;
397 if (!(wp = strdup(what))) {
405 SWAP(u)->from_etc_fstab = true;
408 p->priority = priority;
413 unit_add_to_dbus_queue(u);
420 log_warning("Failed to load swap unit: %s", strerror(-r));
431 static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) {
437 if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) {
438 struct udev_device *d;
440 struct udev_list_entry *item = NULL, *first = NULL;
442 /* So this is a proper swap device. Create swap units
443 * for all names this swap device is known under */
445 if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev)))
448 if ((dn = udev_device_get_devnode(d)))
449 r = swap_add_one(m, dn, device, prio, false, false, false, set_flags);
451 /* Add additional units for all symlinks */
452 first = udev_device_get_devlinks_list_entry(d);
453 udev_list_entry_foreach(item, first) {
456 /* Don't bother with the /dev/block links */
457 p = udev_list_entry_get_name(item);
459 if (path_startswith(p, "/dev/block/"))
462 if (stat(p, &st) >= 0)
463 if ((!S_ISBLK(st.st_mode)) || st.st_rdev != udev_device_get_devnum(d))
466 if ((k = swap_add_one(m, p, device, prio, false, false, false, set_flags)) < 0)
470 udev_device_unref(d);
473 if ((k = swap_add_one(m, device, device, prio, false, false, false, set_flags)) < 0)
479 static void swap_set_state(Swap *s, SwapState state) {
484 old_state = s->state;
487 if (state != SWAP_ACTIVATING &&
488 state != SWAP_ACTIVATING_SIGTERM &&
489 state != SWAP_ACTIVATING_SIGKILL &&
490 state != SWAP_DEACTIVATING &&
491 state != SWAP_DEACTIVATING_SIGTERM &&
492 state != SWAP_DEACTIVATING_SIGKILL) {
493 unit_unwatch_timer(UNIT(s), &s->timer_watch);
494 swap_unwatch_control_pid(s);
495 s->control_command = NULL;
496 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
499 if (state != old_state)
500 log_debug("%s changed %s -> %s",
502 swap_state_to_string(old_state),
503 swap_state_to_string(state));
505 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
508 static int swap_coldplug(Unit *u) {
510 SwapState new_state = SWAP_DEAD;
514 assert(s->state == SWAP_DEAD);
516 if (s->deserialized_state != s->state)
517 new_state = s->deserialized_state;
518 else if (s->from_proc_swaps)
519 new_state = SWAP_ACTIVE;
521 if (new_state != s->state) {
523 if (new_state == SWAP_ACTIVATING ||
524 new_state == SWAP_ACTIVATING_SIGTERM ||
525 new_state == SWAP_ACTIVATING_SIGKILL ||
526 new_state == SWAP_DEACTIVATING ||
527 new_state == SWAP_DEACTIVATING_SIGTERM ||
528 new_state == SWAP_DEACTIVATING_SIGKILL) {
530 if (s->control_pid <= 0)
533 if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
536 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
540 swap_set_state(s, new_state);
546 static void swap_dump(Unit *u, FILE *f, const char *prefix) {
553 if (s->from_proc_swaps)
554 p = &s->parameters_proc_swaps;
555 else if (s->from_fragment)
556 p = &s->parameters_fragment;
558 p = &s->parameters_etc_fstab;
567 "%sFrom /etc/fstab: %s\n"
568 "%sFrom /proc/swaps: %s\n"
569 "%sFrom fragment: %s\n",
570 prefix, swap_state_to_string(s->state),
573 prefix, yes_no(p->noauto),
574 prefix, yes_no(p->nofail),
575 prefix, yes_no(p->handle),
576 prefix, yes_no(s->from_etc_fstab),
577 prefix, yes_no(s->from_proc_swaps),
578 prefix, yes_no(s->from_fragment));
580 if (s->control_pid > 0)
582 "%sControl PID: %lu\n",
583 prefix, (unsigned long) s->control_pid);
585 exec_context_dump(&s->exec_context, f, prefix);
588 static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
596 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
599 if ((r = exec_spawn(c,
603 s->meta.manager->environment,
607 s->meta.manager->confirm_spawn,
608 s->meta.cgroup_bondings,
612 if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
613 /* FIXME: we need to do something here */
621 unit_unwatch_timer(UNIT(s), &s->timer_watch);
626 static void swap_enter_dead(Swap *s, bool success) {
632 swap_set_state(s, s->failure ? SWAP_FAILED : SWAP_DEAD);
635 static void swap_enter_active(Swap *s, bool success) {
641 swap_set_state(s, SWAP_ACTIVE);
644 static void swap_enter_signal(Swap *s, SwapState state, bool success) {
647 bool wait_for_exit = false;
654 if (s->exec_context.kill_mode != KILL_NONE) {
655 int sig = (state == SWAP_ACTIVATING_SIGTERM ||
656 state == SWAP_DEACTIVATING_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
658 if (s->control_pid > 0) {
659 if (kill(s->exec_context.kill_mode == KILL_PROCESS_GROUP ?
661 s->control_pid, sig) < 0 && errno != ESRCH)
663 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
665 wait_for_exit = true;
668 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
670 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
675 /* Exclude the control pid from being killed via the cgroup */
676 if (s->control_pid > 0)
677 if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
680 if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, pid_set)) < 0) {
681 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
682 log_warning("Failed to kill control group: %s", strerror(-r));
684 wait_for_exit = true;
691 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
694 swap_set_state(s, state);
696 swap_enter_dead(s, true);
701 log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
703 swap_enter_dead(s, false);
709 static void swap_enter_activating(Swap *s) {
714 s->control_command_id = SWAP_EXEC_ACTIVATE;
715 s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
717 if (s->from_fragment)
718 priority = s->parameters_fragment.priority;
719 else if (s->from_etc_fstab)
720 priority = s->parameters_etc_fstab.priority;
727 snprintf(p, sizeof(p), "%i", priority);
730 r = exec_command_set(
738 r = exec_command_set(
747 swap_unwatch_control_pid(s);
749 if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0)
752 swap_set_state(s, SWAP_ACTIVATING);
757 log_warning("%s failed to run 'swapon' task: %s", s->meta.id, strerror(-r));
758 swap_enter_dead(s, false);
761 static void swap_enter_deactivating(Swap *s, bool success) {
769 s->control_command_id = SWAP_EXEC_DEACTIVATE;
770 s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
772 if ((r = exec_command_set(
779 swap_unwatch_control_pid(s);
781 if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0)
784 swap_set_state(s, SWAP_DEACTIVATING);
789 log_warning("%s failed to run 'swapoff' task: %s", s->meta.id, strerror(-r));
790 swap_enter_active(s, false);
793 static int swap_start(Unit *u) {
798 /* We cannot fulfill this request right now, try again later
801 if (s->state == SWAP_DEACTIVATING ||
802 s->state == SWAP_DEACTIVATING_SIGTERM ||
803 s->state == SWAP_DEACTIVATING_SIGKILL ||
804 s->state == SWAP_ACTIVATING_SIGTERM ||
805 s->state == SWAP_ACTIVATING_SIGKILL)
808 if (s->state == SWAP_ACTIVATING)
811 assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED);
814 swap_enter_activating(s);
818 static int swap_stop(Unit *u) {
823 if (s->state == SWAP_DEACTIVATING ||
824 s->state == SWAP_DEACTIVATING_SIGTERM ||
825 s->state == SWAP_DEACTIVATING_SIGKILL ||
826 s->state == SWAP_ACTIVATING_SIGTERM ||
827 s->state == SWAP_ACTIVATING_SIGKILL)
830 assert(s->state == SWAP_ACTIVATING ||
831 s->state == SWAP_ACTIVE);
833 swap_enter_deactivating(s, true);
837 static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
844 unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
845 unit_serialize_item(u, f, "failure", yes_no(s->failure));
847 if (s->control_pid > 0)
848 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
850 if (s->control_command_id >= 0)
851 unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id));
856 static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
862 if (streq(key, "state")) {
865 if ((state = swap_state_from_string(value)) < 0)
866 log_debug("Failed to parse state value %s", value);
868 s->deserialized_state = state;
869 } else if (streq(key, "failure")) {
872 if ((b = parse_boolean(value)) < 0)
873 log_debug("Failed to parse failure value %s", value);
875 s->failure = b || s->failure;
877 } else if (streq(key, "control-pid")) {
880 if (parse_pid(value, &pid) < 0)
881 log_debug("Failed to parse control-pid value %s", value);
883 s->control_pid = pid;
885 } else if (streq(key, "control-command")) {
888 if ((id = swap_exec_command_from_string(value)) < 0)
889 log_debug("Failed to parse exec-command value %s", value);
891 s->control_command_id = id;
892 s->control_command = s->exec_command + id;
896 log_debug("Unknown serialization key '%s'", key);
901 static UnitActiveState swap_active_state(Unit *u) {
904 return state_translation_table[SWAP(u)->state];
907 static const char *swap_sub_state_to_string(Unit *u) {
910 return swap_state_to_string(SWAP(u)->state);
913 static bool swap_check_gc(Unit *u) {
918 return s->from_etc_fstab || s->from_proc_swaps;
921 static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
928 if (pid != s->control_pid)
933 success = is_clean_exit(code, status);
934 s->failure = s->failure || !success;
936 if (s->control_command) {
937 exec_status_exit(&s->control_command->exec_status, pid, code, status, s->exec_context.utmp_id);
938 s->control_command = NULL;
939 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
942 log_full(success ? LOG_DEBUG : LOG_NOTICE,
943 "%s swap process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
947 case SWAP_ACTIVATING:
948 case SWAP_ACTIVATING_SIGTERM:
949 case SWAP_ACTIVATING_SIGKILL:
952 swap_enter_active(s, true);
954 swap_enter_dead(s, false);
957 case SWAP_DEACTIVATING:
958 case SWAP_DEACTIVATING_SIGKILL:
959 case SWAP_DEACTIVATING_SIGTERM:
962 swap_enter_dead(s, true);
964 swap_enter_dead(s, false);
968 assert_not_reached("Uh, control process died at wrong time.");
971 /* Notify clients about changed exit status */
972 unit_add_to_dbus_queue(u);
974 /* Request a reload of /proc/swaps, so that following units
975 * can follow our state change */
976 u->meta.manager->request_reload = true;
979 static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
983 assert(elapsed == 1);
984 assert(w == &s->timer_watch);
988 case SWAP_ACTIVATING:
989 log_warning("%s activation timed out. Stopping.", u->meta.id);
990 swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, false);
993 case SWAP_DEACTIVATING:
994 log_warning("%s deactivation timed out. Stopping.", u->meta.id);
995 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, false);
998 case SWAP_ACTIVATING_SIGTERM:
999 if (s->exec_context.send_sigkill) {
1000 log_warning("%s activation timed out. Killing.", u->meta.id);
1001 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, false);
1003 log_warning("%s activation timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1004 swap_enter_dead(s, false);
1008 case SWAP_DEACTIVATING_SIGTERM:
1009 if (s->exec_context.send_sigkill) {
1010 log_warning("%s deactivation timed out. Killing.", u->meta.id);
1011 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, false);
1013 log_warning("%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1014 swap_enter_dead(s, false);
1018 case SWAP_ACTIVATING_SIGKILL:
1019 case SWAP_DEACTIVATING_SIGKILL:
1020 log_warning("%s swap process still around after SIGKILL. Ignoring.", u->meta.id);
1021 swap_enter_dead(s, false);
1025 assert_not_reached("Timeout at wrong time.");
1029 static int swap_load_proc_swaps(Manager *m, bool set_flags) {
1035 rewind(m->proc_swaps);
1037 (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
1040 char *dev = NULL, *d;
1043 if ((k = fscanf(m->proc_swaps,
1044 "%ms " /* device/file */
1045 "%*s " /* type of swap */
1046 "%*s " /* swap size */
1048 "%i\n", /* priority */
1049 &dev, &prio)) != 2) {
1054 log_warning("Failed to parse /proc/swaps:%u.", i);
1065 k = swap_process_new_swap(m, d, prio, set_flags);
1075 int swap_dispatch_reload(Manager *m) {
1076 /* This function should go as soon as the kernel properly notifies us */
1078 if (_likely_(!m->request_reload))
1081 m->request_reload = false;
1083 return swap_fd_event(m, EPOLLPRI);
1086 int swap_fd_event(Manager *m, int events) {
1091 assert(events & EPOLLPRI);
1093 if ((r = swap_load_proc_swaps(m, true)) < 0) {
1094 log_error("Failed to reread /proc/swaps: %s", strerror(-r));
1096 /* Reset flags, just in case, for late calls */
1097 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_SWAP]) {
1098 Swap *swap = (Swap*) meta;
1100 swap->is_active = swap->just_activated = false;
1106 manager_dispatch_load_queue(m);
1108 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_SWAP]) {
1109 Swap *swap = (Swap*) meta;
1111 if (!swap->is_active) {
1112 /* This has just been deactivated */
1114 swap->from_proc_swaps = false;
1115 swap_unset_proc_swaps(swap);
1117 switch (swap->state) {
1120 swap_enter_dead(swap, true);
1124 swap_set_state(swap, swap->state);
1128 } else if (swap->just_activated) {
1130 /* New swap entry */
1132 switch (swap->state) {
1136 swap_enter_active(swap, true);
1140 /* Nothing really changed, but let's
1141 * issue an notification call
1142 * nonetheless, in case somebody is
1143 * waiting for this. */
1144 swap_set_state(swap, swap->state);
1149 /* Reset the flags for later calls */
1150 swap->is_active = swap->just_activated = false;
1156 static Unit *swap_following(Unit *u) {
1158 Swap *other, *first = NULL;
1162 if (streq_ptr(s->what, s->parameters_proc_swaps.what))
1165 /* Make everybody follow the unit that's named after the swap
1166 * device in the kernel */
1168 LIST_FOREACH_AFTER(same_proc_swaps, other, s)
1169 if (streq_ptr(other->what, other->parameters_proc_swaps.what))
1172 LIST_FOREACH_BEFORE(same_proc_swaps, other, s) {
1173 if (streq_ptr(other->what, other->parameters_proc_swaps.what))
1182 static int swap_following_set(Unit *u, Set **_set) {
1191 if (LIST_JUST_US(same_proc_swaps, s)) {
1196 if (!(set = set_new(NULL, NULL)))
1199 LIST_FOREACH_AFTER(same_proc_swaps, other, s)
1200 if ((r = set_put(set, other)) < 0)
1203 LIST_FOREACH_BEFORE(same_proc_swaps, other, s)
1204 if ((r = set_put(set, other)) < 0)
1215 static void swap_shutdown(Manager *m) {
1218 if (m->proc_swaps) {
1219 fclose(m->proc_swaps);
1220 m->proc_swaps = NULL;
1223 hashmap_free(m->swaps_by_proc_swaps);
1224 m->swaps_by_proc_swaps = NULL;
1227 static int swap_enumerate(Manager *m) {
1229 struct epoll_event ev;
1232 if (!m->proc_swaps) {
1233 if (!(m->proc_swaps = fopen("/proc/swaps", "re")))
1236 m->swap_watch.type = WATCH_SWAP;
1237 m->swap_watch.fd = fileno(m->proc_swaps);
1240 ev.events = EPOLLPRI;
1241 ev.data.ptr = &m->swap_watch;
1243 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0)
1247 /* We rely on mount.c to load /etc/fstab for us */
1249 if ((r = swap_load_proc_swaps(m, false)) < 0)
1255 static void swap_reset_failed(Unit *u) {
1260 if (s->state == SWAP_FAILED)
1261 swap_set_state(s, SWAP_DEAD);
1266 static int swap_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1269 Set *pid_set = NULL;
1273 if (who == KILL_MAIN) {
1274 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes");
1278 if (s->control_pid <= 0 && who == KILL_CONTROL) {
1279 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1283 if (s->control_pid > 0)
1284 if (kill(mode == KILL_PROCESS_GROUP ? -s->control_pid : s->control_pid, signo) < 0)
1287 if (mode == KILL_CONTROL_GROUP) {
1290 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1293 /* Exclude the control pid from being killed via the cgroup */
1294 if (s->control_pid > 0)
1295 if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
1300 if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, pid_set)) < 0)
1301 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1312 static const char* const swap_state_table[_SWAP_STATE_MAX] = {
1313 [SWAP_DEAD] = "dead",
1314 [SWAP_ACTIVATING] = "activating",
1315 [SWAP_ACTIVE] = "active",
1316 [SWAP_DEACTIVATING] = "deactivating",
1317 [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm",
1318 [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill",
1319 [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm",
1320 [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill",
1321 [SWAP_FAILED] = "failed"
1324 DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
1326 static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
1327 [SWAP_EXEC_ACTIVATE] = "ExecActivate",
1328 [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
1331 DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
1333 const UnitVTable swap_vtable = {
1337 .no_instances = true,
1339 .show_status = true,
1345 .coldplug = swap_coldplug,
1349 .start = swap_start,
1354 .serialize = swap_serialize,
1355 .deserialize_item = swap_deserialize_item,
1357 .active_state = swap_active_state,
1358 .sub_state_to_string = swap_sub_state_to_string,
1360 .check_gc = swap_check_gc,
1362 .sigchld_event = swap_sigchld_event,
1363 .timer_event = swap_timer_event,
1365 .reset_failed = swap_reset_failed,
1367 .bus_interface = "org.freedesktop.systemd1.Swap",
1368 .bus_message_handler = bus_swap_message_handler,
1369 .bus_invalidating_properties = bus_swap_invalidating_properties,
1371 .following = swap_following,
1372 .following_set = swap_following_set,
1374 .enumerate = swap_enumerate,
1375 .shutdown = swap_shutdown