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"
40 static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
41 [SWAP_DEAD] = UNIT_INACTIVE,
42 [SWAP_ACTIVATING] = UNIT_ACTIVATING,
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 void swap_unset_proc_swaps(Swap *s) {
57 if (!s->parameters_proc_swaps.what)
60 /* Remove this unit from the chain of swaps which share the
61 * same kernel swap device. */
63 first = hashmap_get(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what);
64 LIST_REMOVE(Swap, same_proc_swaps, first, s);
67 hashmap_remove_and_replace(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first);
69 hashmap_remove(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what);
71 free(s->parameters_proc_swaps.what);
72 s->parameters_proc_swaps.what = NULL;
75 static void swap_init(Unit *u) {
79 assert(s->meta.load_state == UNIT_STUB);
81 s->timeout_usec = DEFAULT_TIMEOUT_USEC;
83 exec_context_init(&s->exec_context);
85 s->parameters_etc_fstab.priority = s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1;
87 s->timer_watch.type = WATCH_INVALID;
89 s->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
92 static void swap_unwatch_control_pid(Swap *s) {
95 if (s->control_pid <= 0)
98 unit_unwatch_pid(UNIT(s), s->control_pid);
102 static void swap_done(Unit *u) {
107 swap_unset_proc_swaps(s);
112 free(s->parameters_etc_fstab.what);
113 free(s->parameters_fragment.what);
114 s->parameters_etc_fstab.what = s->parameters_fragment.what = NULL;
116 exec_context_done(&s->exec_context);
117 exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
118 s->control_command = NULL;
120 swap_unwatch_control_pid(s);
122 unit_unwatch_timer(u, &s->timer_watch);
125 int swap_add_one_mount_link(Swap *s, Mount *m) {
131 if (s->meta.load_state != UNIT_LOADED ||
132 m->meta.load_state != UNIT_LOADED)
135 if (is_device_path(s->what))
138 if (!path_startswith(s->what, m->where))
141 if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
147 static int swap_add_mount_links(Swap *s) {
153 LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
154 if ((r = swap_add_one_mount_link(s, (Mount*) other)) < 0)
160 static int swap_add_target_links(Swap *s) {
167 if (s->from_fragment)
168 p = &s->parameters_fragment;
169 else if (s->from_etc_fstab)
170 p = &s->parameters_etc_fstab;
174 if ((r = manager_load_unit(s->meta.manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0)
178 (p->handle || s->meta.manager->swap_auto) &&
180 s->meta.manager->running_as == MANAGER_SYSTEM)
181 if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 0)
184 return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true);
187 static int swap_add_device_links(Swap *s) {
195 if (s->from_fragment)
196 p = &s->parameters_fragment;
197 else if (s->from_etc_fstab)
198 p = &s->parameters_etc_fstab;
202 return unit_add_node_link(UNIT(s), s->what,
203 !p->noauto && p->nofail &&
204 s->meta.manager->running_as == MANAGER_SYSTEM);
207 static int swap_add_default_dependencies(Swap *s) {
212 if (s->meta.manager->running_as == MANAGER_SYSTEM) {
214 if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
221 static int swap_verify(Swap *s) {
225 if (s->meta.load_state != UNIT_LOADED)
228 if (!(e = unit_name_from_path(s->what, ".swap")))
231 b = unit_has_name(UNIT(s), e);
235 log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", s->meta.id);
239 if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
240 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id);
247 static int swap_load(Unit *u) {
252 assert(u->meta.load_state == UNIT_STUB);
254 /* Load a .swap file */
255 if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
258 if (u->meta.load_state == UNIT_LOADED) {
260 if (s->meta.fragment_path)
261 s->from_fragment = true;
264 if (s->parameters_fragment.what)
265 s->what = strdup(s->parameters_fragment.what);
266 else if (s->parameters_etc_fstab.what)
267 s->what = strdup(s->parameters_etc_fstab.what);
268 else if (s->parameters_proc_swaps.what)
269 s->what = strdup(s->parameters_proc_swaps.what);
271 s->what = unit_name_to_path(u->meta.id);
277 path_kill_slashes(s->what);
279 if (!s->meta.description)
280 if ((r = unit_set_description(u, s->what)) < 0)
283 if ((r = swap_add_device_links(s)) < 0)
286 if ((r = swap_add_mount_links(s)) < 0)
289 if ((r = swap_add_target_links(s)) < 0)
292 if ((r = unit_add_default_cgroups(u)) < 0)
295 if (s->meta.default_dependencies)
296 if ((r = swap_add_default_dependencies(s)) < 0)
300 return swap_verify(s);
306 const char *what_proc_swaps,
314 char *e = NULL, *wp = NULL;
322 if (!(e = unit_name_from_path(what, ".swap")))
325 u = manager_get_unit(m, e);
327 if (what_proc_swaps &&
329 SWAP(u)->from_proc_swaps &&
330 !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps))
336 if (!(u = unit_new(m))) {
341 if ((r = unit_add_name(u, e)) < 0)
344 if (!(SWAP(u)->what = strdup(what))) {
349 unit_add_to_load_queue(u);
353 if (what_proc_swaps) {
356 p = &SWAP(u)->parameters_proc_swaps;
359 if (!(wp = strdup(what_proc_swaps))) {
364 if (!m->swaps_by_proc_swaps)
365 if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) {
373 first = hashmap_get(m->swaps_by_proc_swaps, wp);
374 LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u));
376 if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 0)
381 SWAP(u)->is_active = true;
382 SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps;
385 SWAP(u)->from_proc_swaps = true;
388 p = &SWAP(u)->parameters_etc_fstab;
390 if (!(wp = strdup(what))) {
398 SWAP(u)->from_etc_fstab = true;
401 p->priority = priority;
406 unit_add_to_dbus_queue(u);
413 log_warning("Failed to load swap unit: %s", strerror(-r));
424 static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) {
430 if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) {
431 struct udev_device *d;
433 struct udev_list_entry *item = NULL, *first = NULL;
435 /* So this is a proper swap device. Create swap units
436 * for all names this swap device is known under */
438 if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev)))
441 if ((dn = udev_device_get_devnode(d)))
442 r = swap_add_one(m, dn, device, prio, false, false, false, set_flags);
444 /* Add additional units for all symlinks */
445 first = udev_device_get_devlinks_list_entry(d);
446 udev_list_entry_foreach(item, first) {
449 /* Don't bother with the /dev/block links */
450 p = udev_list_entry_get_name(item);
452 if (path_startswith(p, "/dev/block/"))
455 if (stat(p, &st) >= 0)
456 if ((!S_ISBLK(st.st_mode)) || st.st_rdev != udev_device_get_devnum(d))
459 if ((k = swap_add_one(m, p, device, prio, false, false, false, set_flags)) < 0)
463 udev_device_unref(d);
466 if ((k = swap_add_one(m, device, device, prio, false, false, false, set_flags)) < 0)
472 static void swap_set_state(Swap *s, SwapState state) {
477 old_state = s->state;
480 if (state != SWAP_ACTIVATING &&
481 state != SWAP_ACTIVATING_SIGTERM &&
482 state != SWAP_ACTIVATING_SIGKILL &&
483 state != SWAP_DEACTIVATING &&
484 state != SWAP_DEACTIVATING_SIGTERM &&
485 state != SWAP_DEACTIVATING_SIGKILL) {
486 unit_unwatch_timer(UNIT(s), &s->timer_watch);
487 swap_unwatch_control_pid(s);
488 s->control_command = NULL;
489 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
492 if (state != old_state)
493 log_debug("%s changed %s -> %s",
495 swap_state_to_string(old_state),
496 swap_state_to_string(state));
498 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
501 static int swap_coldplug(Unit *u) {
503 SwapState new_state = SWAP_DEAD;
507 assert(s->state == SWAP_DEAD);
509 if (s->deserialized_state != s->state)
510 new_state = s->deserialized_state;
511 else if (s->from_proc_swaps)
512 new_state = SWAP_ACTIVE;
514 if (new_state != s->state) {
516 if (new_state == SWAP_ACTIVATING ||
517 new_state == SWAP_ACTIVATING_SIGTERM ||
518 new_state == SWAP_ACTIVATING_SIGKILL ||
519 new_state == SWAP_DEACTIVATING ||
520 new_state == SWAP_DEACTIVATING_SIGTERM ||
521 new_state == SWAP_DEACTIVATING_SIGKILL) {
523 if (s->control_pid <= 0)
526 if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
529 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
533 swap_set_state(s, new_state);
539 static void swap_dump(Unit *u, FILE *f, const char *prefix) {
546 if (s->from_proc_swaps)
547 p = &s->parameters_proc_swaps;
548 else if (s->from_fragment)
549 p = &s->parameters_fragment;
551 p = &s->parameters_etc_fstab;
560 "%sFrom /etc/fstab: %s\n"
561 "%sFrom /proc/swaps: %s\n"
562 "%sFrom fragment: %s\n",
563 prefix, swap_state_to_string(s->state),
566 prefix, yes_no(p->noauto),
567 prefix, yes_no(p->nofail),
568 prefix, yes_no(p->handle),
569 prefix, yes_no(s->from_etc_fstab),
570 prefix, yes_no(s->from_proc_swaps),
571 prefix, yes_no(s->from_fragment));
573 if (s->control_pid > 0)
575 "%sControl PID: %lu\n",
576 prefix, (unsigned long) s->control_pid);
578 exec_context_dump(&s->exec_context, f, prefix);
581 static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
589 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
592 if ((r = exec_spawn(c,
596 s->meta.manager->environment,
600 s->meta.manager->confirm_spawn,
601 s->meta.cgroup_bondings,
605 if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
606 /* FIXME: we need to do something here */
614 unit_unwatch_timer(UNIT(s), &s->timer_watch);
619 static void swap_enter_dead(Swap *s, bool success) {
625 swap_set_state(s, s->failure ? SWAP_FAILED : SWAP_DEAD);
628 static void swap_enter_active(Swap *s, bool success) {
634 swap_set_state(s, SWAP_ACTIVE);
637 static void swap_enter_signal(Swap *s, SwapState state, bool success) {
640 bool wait_for_exit = false;
647 if (s->exec_context.kill_mode != KILL_NONE) {
648 int sig = (state == SWAP_ACTIVATING_SIGTERM ||
649 state == SWAP_DEACTIVATING_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
651 if (s->control_pid > 0) {
652 if (kill(s->exec_context.kill_mode == KILL_PROCESS_GROUP ?
654 s->control_pid, sig) < 0 && errno != ESRCH)
656 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
658 wait_for_exit = true;
661 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
663 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
668 /* Exclude the control pid from being killed via the cgroup */
669 if (s->control_pid > 0)
670 if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
673 if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, pid_set)) < 0) {
674 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
675 log_warning("Failed to kill control group: %s", strerror(-r));
677 wait_for_exit = true;
684 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
687 swap_set_state(s, state);
689 swap_enter_dead(s, true);
694 log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
696 swap_enter_dead(s, false);
702 static void swap_enter_activating(Swap *s) {
707 s->control_command_id = SWAP_EXEC_ACTIVATE;
708 s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
710 if (s->from_fragment)
711 priority = s->parameters_fragment.priority;
712 else if (s->from_etc_fstab)
713 priority = s->parameters_etc_fstab.priority;
720 snprintf(p, sizeof(p), "%i", priority);
723 r = exec_command_set(
731 r = exec_command_set(
740 swap_unwatch_control_pid(s);
742 if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0)
745 swap_set_state(s, SWAP_ACTIVATING);
750 log_warning("%s failed to run 'swapon' task: %s", s->meta.id, strerror(-r));
751 swap_enter_dead(s, false);
754 static void swap_enter_deactivating(Swap *s, bool success) {
762 s->control_command_id = SWAP_EXEC_DEACTIVATE;
763 s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
765 if ((r = exec_command_set(
772 swap_unwatch_control_pid(s);
774 if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0)
777 swap_set_state(s, SWAP_DEACTIVATING);
782 log_warning("%s failed to run 'swapoff' task: %s", s->meta.id, strerror(-r));
783 swap_enter_active(s, false);
786 static int swap_start(Unit *u) {
791 /* We cannot fulfill this request right now, try again later
794 if (s->state == SWAP_DEACTIVATING ||
795 s->state == SWAP_DEACTIVATING_SIGTERM ||
796 s->state == SWAP_DEACTIVATING_SIGKILL ||
797 s->state == SWAP_ACTIVATING_SIGTERM ||
798 s->state == SWAP_ACTIVATING_SIGKILL)
801 if (s->state == SWAP_ACTIVATING)
804 assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED);
807 swap_enter_activating(s);
811 static int swap_stop(Unit *u) {
816 if (s->state == SWAP_DEACTIVATING ||
817 s->state == SWAP_DEACTIVATING_SIGTERM ||
818 s->state == SWAP_DEACTIVATING_SIGKILL ||
819 s->state == SWAP_ACTIVATING_SIGTERM ||
820 s->state == SWAP_ACTIVATING_SIGKILL)
823 assert(s->state == SWAP_ACTIVATING ||
824 s->state == SWAP_ACTIVE);
826 swap_enter_deactivating(s, true);
830 static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
837 unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
838 unit_serialize_item(u, f, "failure", yes_no(s->failure));
840 if (s->control_pid > 0)
841 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
843 if (s->control_command_id >= 0)
844 unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id));
849 static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
855 if (streq(key, "state")) {
858 if ((state = swap_state_from_string(value)) < 0)
859 log_debug("Failed to parse state value %s", value);
861 s->deserialized_state = state;
862 } else if (streq(key, "failure")) {
865 if ((b = parse_boolean(value)) < 0)
866 log_debug("Failed to parse failure value %s", value);
868 s->failure = b || s->failure;
870 } else if (streq(key, "control-pid")) {
873 if (parse_pid(value, &pid) < 0)
874 log_debug("Failed to parse control-pid value %s", value);
876 s->control_pid = pid;
878 } else if (streq(key, "control-command")) {
881 if ((id = swap_exec_command_from_string(value)) < 0)
882 log_debug("Failed to parse exec-command value %s", value);
884 s->control_command_id = id;
885 s->control_command = s->exec_command + id;
889 log_debug("Unknown serialization key '%s'", key);
894 static UnitActiveState swap_active_state(Unit *u) {
897 return state_translation_table[SWAP(u)->state];
900 static const char *swap_sub_state_to_string(Unit *u) {
903 return swap_state_to_string(SWAP(u)->state);
906 static bool swap_check_gc(Unit *u) {
911 return s->from_etc_fstab || s->from_proc_swaps;
914 static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
921 if (pid != s->control_pid)
926 success = is_clean_exit(code, status);
927 s->failure = s->failure || !success;
929 if (s->control_command) {
930 exec_status_exit(&s->control_command->exec_status, pid, code, status, s->exec_context.utmp_id);
931 s->control_command = NULL;
932 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
935 log_full(success ? LOG_DEBUG : LOG_NOTICE,
936 "%s swap process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
940 case SWAP_ACTIVATING:
941 case SWAP_ACTIVATING_SIGTERM:
942 case SWAP_ACTIVATING_SIGKILL:
945 swap_enter_active(s, true);
947 swap_enter_dead(s, false);
950 case SWAP_DEACTIVATING:
951 case SWAP_DEACTIVATING_SIGKILL:
952 case SWAP_DEACTIVATING_SIGTERM:
955 swap_enter_dead(s, true);
957 swap_enter_dead(s, false);
961 assert_not_reached("Uh, control process died at wrong time.");
964 /* Notify clients about changed exit status */
965 unit_add_to_dbus_queue(u);
967 /* Request a reload of /proc/swaps, so that following units
968 * can follow our state change */
969 u->meta.manager->request_reload = true;
972 static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
976 assert(elapsed == 1);
977 assert(w == &s->timer_watch);
981 case SWAP_ACTIVATING:
982 log_warning("%s activation timed out. Stopping.", u->meta.id);
983 swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, false);
986 case SWAP_DEACTIVATING:
987 log_warning("%s deactivation timed out. Stopping.", u->meta.id);
988 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, false);
991 case SWAP_ACTIVATING_SIGTERM:
992 log_warning("%s activation timed out. Killing.", u->meta.id);
993 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, false);
996 case SWAP_DEACTIVATING_SIGTERM:
997 log_warning("%s deactivation timed out. Killing.", u->meta.id);
998 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, false);
1001 case SWAP_ACTIVATING_SIGKILL:
1002 case SWAP_DEACTIVATING_SIGKILL:
1003 log_warning("%s swap process still around after SIGKILL. Ignoring.", u->meta.id);
1004 swap_enter_dead(s, false);
1008 assert_not_reached("Timeout at wrong time.");
1012 static int swap_load_proc_swaps(Manager *m, bool set_flags) {
1018 rewind(m->proc_swaps);
1020 (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
1023 char *dev = NULL, *d;
1026 if ((k = fscanf(m->proc_swaps,
1027 "%ms " /* device/file */
1028 "%*s " /* type of swap */
1029 "%*s " /* swap size */
1031 "%i\n", /* priority */
1032 &dev, &prio)) != 2) {
1037 log_warning("Failed to parse /proc/swaps:%u.", i);
1048 k = swap_process_new_swap(m, d, prio, set_flags);
1058 int swap_dispatch_reload(Manager *m) {
1059 /* This function should go as soon as the kernel properly notifies us */
1061 if (_likely_(!m->request_reload))
1064 m->request_reload = false;
1066 return swap_fd_event(m, EPOLLPRI);
1069 int swap_fd_event(Manager *m, int events) {
1074 assert(events & EPOLLPRI);
1076 if ((r == swap_load_proc_swaps(m, true)) < 0) {
1077 log_error("Failed to reread /proc/swaps: %s", strerror(-r));
1079 /* Reset flags, just in case, for late calls */
1080 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_SWAP]) {
1081 Swap *swap = (Swap*) meta;
1083 swap->is_active = swap->just_activated = false;
1089 manager_dispatch_load_queue(m);
1091 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_SWAP]) {
1092 Swap *swap = (Swap*) meta;
1094 if (!swap->is_active) {
1095 /* This has just been deactivated */
1097 swap->from_proc_swaps = false;
1098 swap_unset_proc_swaps(swap);
1100 switch (swap->state) {
1103 swap_enter_dead(swap, true);
1107 swap_set_state(swap, swap->state);
1111 } else if (swap->just_activated) {
1113 /* New swap entry */
1115 switch (swap->state) {
1119 swap_enter_active(swap, true);
1123 /* Nothing really changed, but let's
1124 * issue an notification call
1125 * nonetheless, in case somebody is
1126 * waiting for this. */
1127 swap_set_state(swap, swap->state);
1132 /* Reset the flags for later calls */
1133 swap->is_active = swap->just_activated = false;
1139 static Unit *swap_following(Unit *u) {
1141 Swap *other, *first = NULL;
1145 if (streq_ptr(s->what, s->parameters_proc_swaps.what))
1148 /* Make everybody follow the unit that's named after the swap
1149 * device in the kernel */
1151 LIST_FOREACH_AFTER(same_proc_swaps, other, s)
1152 if (streq_ptr(other->what, other->parameters_proc_swaps.what))
1155 LIST_FOREACH_BEFORE(same_proc_swaps, other, s) {
1156 if (streq_ptr(other->what, other->parameters_proc_swaps.what))
1165 static int swap_following_set(Unit *u, Set **_set) {
1174 if (LIST_JUST_US(same_proc_swaps, s)) {
1179 if (!(set = set_new(NULL, NULL)))
1182 LIST_FOREACH_AFTER(same_proc_swaps, other, s)
1183 if ((r = set_put(set, other)) < 0)
1186 LIST_FOREACH_BEFORE(same_proc_swaps, other, s)
1187 if ((r = set_put(set, other)) < 0)
1198 static void swap_shutdown(Manager *m) {
1201 if (m->proc_swaps) {
1202 fclose(m->proc_swaps);
1203 m->proc_swaps = NULL;
1206 hashmap_free(m->swaps_by_proc_swaps);
1207 m->swaps_by_proc_swaps = NULL;
1210 static int swap_enumerate(Manager *m) {
1212 struct epoll_event ev;
1215 if (!m->proc_swaps) {
1216 if (!(m->proc_swaps = fopen("/proc/swaps", "re")))
1219 m->swap_watch.type = WATCH_SWAP;
1220 m->swap_watch.fd = fileno(m->proc_swaps);
1223 ev.events = EPOLLPRI;
1224 ev.data.ptr = &m->swap_watch;
1226 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0)
1230 /* We rely on mount.c to load /etc/fstab for us */
1232 if ((r = swap_load_proc_swaps(m, false)) < 0)
1238 static void swap_reset_failed(Unit *u) {
1243 if (s->state == SWAP_FAILED)
1244 swap_set_state(s, SWAP_DEAD);
1249 static int swap_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1252 Set *pid_set = NULL;
1256 if (who == KILL_MAIN) {
1257 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes");
1261 if (s->control_pid <= 0 && who == KILL_CONTROL) {
1262 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1266 if (s->control_pid > 0)
1267 if (kill(mode == KILL_PROCESS_GROUP ? -s->control_pid : s->control_pid, signo) < 0)
1270 if (mode == KILL_CONTROL_GROUP) {
1273 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1276 /* Exclude the control pid from being killed via the cgroup */
1277 if (s->control_pid > 0)
1278 if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
1283 if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, pid_set)) < 0)
1284 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1295 static const char* const swap_state_table[_SWAP_STATE_MAX] = {
1296 [SWAP_DEAD] = "dead",
1297 [SWAP_ACTIVATING] = "activating",
1298 [SWAP_ACTIVE] = "active",
1299 [SWAP_DEACTIVATING] = "deactivating",
1300 [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm",
1301 [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill",
1302 [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm",
1303 [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill",
1304 [SWAP_FAILED] = "failed"
1307 DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
1309 static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
1310 [SWAP_EXEC_ACTIVATE] = "ExecActivate",
1311 [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
1314 DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
1316 const UnitVTable swap_vtable = {
1320 .no_instances = true,
1322 .show_status = true,
1328 .coldplug = swap_coldplug,
1332 .start = swap_start,
1337 .serialize = swap_serialize,
1338 .deserialize_item = swap_deserialize_item,
1340 .active_state = swap_active_state,
1341 .sub_state_to_string = swap_sub_state_to_string,
1343 .check_gc = swap_check_gc,
1345 .sigchld_event = swap_sigchld_event,
1346 .timer_event = swap_timer_event,
1348 .reset_failed = swap_reset_failed,
1350 .bus_interface = "org.freedesktop.systemd1.Swap",
1351 .bus_message_handler = bus_swap_message_handler,
1352 .bus_invalidating_properties = bus_swap_invalidating_properties,
1354 .following = swap_following,
1355 .following_set = swap_following_set,
1357 .enumerate = swap_enumerate,
1358 .shutdown = swap_shutdown