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"
42 static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
43 [SWAP_DEAD] = UNIT_INACTIVE,
44 [SWAP_ACTIVATING] = UNIT_ACTIVATING,
45 [SWAP_ACTIVE] = UNIT_ACTIVE,
46 [SWAP_DEACTIVATING] = UNIT_DEACTIVATING,
47 [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
48 [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
49 [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
50 [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
51 [SWAP_FAILED] = UNIT_FAILED
54 static void swap_unset_proc_swaps(Swap *s) {
59 if (!s->parameters_proc_swaps.what)
62 /* Remove this unit from the chain of swaps which share the
63 * same kernel swap device. */
65 first = hashmap_get(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what);
66 LIST_REMOVE(Swap, same_proc_swaps, first, s);
69 hashmap_remove_and_replace(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first);
71 hashmap_remove(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what);
73 free(s->parameters_proc_swaps.what);
74 s->parameters_proc_swaps.what = NULL;
77 static void swap_init(Unit *u) {
81 assert(UNIT(s)->load_state == UNIT_STUB);
83 s->timeout_usec = DEFAULT_TIMEOUT_USEC;
85 exec_context_init(&s->exec_context);
86 s->exec_context.std_output = u->manager->default_std_output;
87 s->exec_context.std_error = u->manager->default_std_error;
89 s->parameters_etc_fstab.priority = s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1;
91 s->timer_watch.type = WATCH_INVALID;
93 s->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
95 UNIT(s)->ignore_on_isolate = true;
98 static void swap_unwatch_control_pid(Swap *s) {
101 if (s->control_pid <= 0)
104 unit_unwatch_pid(UNIT(s), s->control_pid);
108 static void swap_done(Unit *u) {
113 swap_unset_proc_swaps(s);
118 free(s->parameters_etc_fstab.what);
119 free(s->parameters_fragment.what);
120 s->parameters_etc_fstab.what = s->parameters_fragment.what = NULL;
122 exec_context_done(&s->exec_context);
123 exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
124 s->control_command = NULL;
126 swap_unwatch_control_pid(s);
128 unit_unwatch_timer(u, &s->timer_watch);
131 int swap_add_one_mount_link(Swap *s, Mount *m) {
137 if (UNIT(s)->load_state != UNIT_LOADED ||
138 UNIT(m)->load_state != UNIT_LOADED)
141 if (is_device_path(s->what))
144 if (!path_startswith(s->what, m->where))
147 if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
153 static int swap_add_mount_links(Swap *s) {
159 LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_MOUNT])
160 if ((r = swap_add_one_mount_link(s, MOUNT(other))) < 0)
166 static int swap_add_target_links(Swap *s) {
173 if (s->from_fragment)
174 p = &s->parameters_fragment;
175 else if (s->from_etc_fstab)
176 p = &s->parameters_etc_fstab;
180 if ((r = manager_load_unit(UNIT(s)->manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0)
185 (p->handle || UNIT(s)->manager->swap_auto) &&
187 UNIT(s)->manager->running_as == MANAGER_SYSTEM)
188 if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 0)
191 return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true);
194 static int swap_add_device_links(Swap *s) {
202 if (s->from_fragment)
203 p = &s->parameters_fragment;
204 else if (s->from_etc_fstab)
205 p = &s->parameters_etc_fstab;
209 if (is_device_path(s->what))
210 return unit_add_node_link(UNIT(s), s->what,
211 !p->noauto && p->nofail &&
212 UNIT(s)->manager->running_as == MANAGER_SYSTEM);
214 /* File based swap devices need to be ordered after
215 * remount-rootfs.service, since they might need a
216 * writable file system. */
217 return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_ROOTFS_SERVICE, NULL, true);
220 static int swap_add_default_dependencies(Swap *s) {
225 if (UNIT(s)->manager->running_as == MANAGER_SYSTEM) {
227 if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
234 static int swap_verify(Swap *s) {
238 if (UNIT(s)->load_state != UNIT_LOADED)
241 if (!(e = unit_name_from_path(s->what, ".swap")))
244 b = unit_has_name(UNIT(s), e);
248 log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", UNIT(s)->id);
252 if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
253 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(s)->id);
260 static int swap_load(Unit *u) {
265 assert(u->load_state == UNIT_STUB);
267 /* Load a .swap file */
268 if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
271 if (u->load_state == UNIT_LOADED) {
272 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
275 if (UNIT(s)->fragment_path)
276 s->from_fragment = true;
279 if (s->parameters_fragment.what)
280 s->what = strdup(s->parameters_fragment.what);
281 else if (s->parameters_etc_fstab.what)
282 s->what = strdup(s->parameters_etc_fstab.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 if ((r = unit_set_description(u, s->what)) < 0)
298 if ((r = swap_add_device_links(s)) < 0)
301 if ((r = swap_add_mount_links(s)) < 0)
304 if ((r = swap_add_target_links(s)) < 0)
307 if ((r = unit_add_default_cgroups(u)) < 0)
310 if (UNIT(s)->default_dependencies)
311 if ((r = swap_add_default_dependencies(s)) < 0)
315 return swap_verify(s);
321 const char *what_proc_swaps,
329 char *e = NULL, *wp = NULL;
337 e = unit_name_from_path(what, ".swap");
341 u = manager_get_unit(m, e);
343 if (what_proc_swaps &&
345 SWAP(u)->from_proc_swaps &&
346 !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps))
352 u = unit_new(m, sizeof(Swap));
358 r = unit_add_name(u, e);
362 SWAP(u)->what = strdup(what);
363 if (!SWAP(u)->what) {
368 unit_add_to_load_queue(u);
372 if (what_proc_swaps) {
375 p = &SWAP(u)->parameters_proc_swaps;
378 if (!(wp = strdup(what_proc_swaps))) {
383 if (!m->swaps_by_proc_swaps)
384 if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) {
392 first = hashmap_get(m->swaps_by_proc_swaps, wp);
393 LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u));
395 if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 0)
400 SWAP(u)->is_active = true;
401 SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps;
404 SWAP(u)->from_proc_swaps = true;
407 p = &SWAP(u)->parameters_etc_fstab;
409 if (!(wp = strdup(what))) {
417 SWAP(u)->from_etc_fstab = true;
420 p->priority = priority;
425 unit_add_to_dbus_queue(u);
432 log_warning("Failed to load swap unit: %s", strerror(-r));
443 static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) {
449 if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) {
450 struct udev_device *d;
452 struct udev_list_entry *item = NULL, *first = NULL;
454 /* So this is a proper swap device. Create swap units
455 * for all names this swap device is known under */
457 if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev)))
460 if ((dn = udev_device_get_devnode(d)))
461 r = swap_add_one(m, dn, device, prio, false, false, false, set_flags);
463 /* Add additional units for all symlinks */
464 first = udev_device_get_devlinks_list_entry(d);
465 udev_list_entry_foreach(item, first) {
468 /* Don't bother with the /dev/block links */
469 p = udev_list_entry_get_name(item);
471 if (path_startswith(p, "/dev/block/"))
474 if (stat(p, &st) >= 0)
475 if ((!S_ISBLK(st.st_mode)) || st.st_rdev != udev_device_get_devnum(d))
478 if ((k = swap_add_one(m, p, device, prio, false, false, false, set_flags)) < 0)
482 udev_device_unref(d);
485 if ((k = swap_add_one(m, device, device, prio, false, false, false, set_flags)) < 0)
491 static void swap_set_state(Swap *s, SwapState state) {
496 old_state = s->state;
499 if (state != SWAP_ACTIVATING &&
500 state != SWAP_ACTIVATING_SIGTERM &&
501 state != SWAP_ACTIVATING_SIGKILL &&
502 state != SWAP_DEACTIVATING &&
503 state != SWAP_DEACTIVATING_SIGTERM &&
504 state != SWAP_DEACTIVATING_SIGKILL) {
505 unit_unwatch_timer(UNIT(s), &s->timer_watch);
506 swap_unwatch_control_pid(s);
507 s->control_command = NULL;
508 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
511 if (state != old_state)
512 log_debug("%s changed %s -> %s",
514 swap_state_to_string(old_state),
515 swap_state_to_string(state));
517 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
520 static int swap_coldplug(Unit *u) {
522 SwapState new_state = SWAP_DEAD;
526 assert(s->state == SWAP_DEAD);
528 if (s->deserialized_state != s->state)
529 new_state = s->deserialized_state;
530 else if (s->from_proc_swaps)
531 new_state = SWAP_ACTIVE;
533 if (new_state != s->state) {
535 if (new_state == SWAP_ACTIVATING ||
536 new_state == SWAP_ACTIVATING_SIGTERM ||
537 new_state == SWAP_ACTIVATING_SIGKILL ||
538 new_state == SWAP_DEACTIVATING ||
539 new_state == SWAP_DEACTIVATING_SIGTERM ||
540 new_state == SWAP_DEACTIVATING_SIGKILL) {
542 if (s->control_pid <= 0)
545 if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
548 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
552 swap_set_state(s, new_state);
558 static void swap_dump(Unit *u, FILE *f, const char *prefix) {
565 if (s->from_proc_swaps)
566 p = &s->parameters_proc_swaps;
567 else if (s->from_fragment)
568 p = &s->parameters_fragment;
570 p = &s->parameters_etc_fstab;
579 "%sFrom /etc/fstab: %s\n"
580 "%sFrom /proc/swaps: %s\n"
581 "%sFrom fragment: %s\n",
582 prefix, swap_state_to_string(s->state),
585 prefix, yes_no(p->noauto),
586 prefix, yes_no(p->nofail),
587 prefix, yes_no(p->handle),
588 prefix, yes_no(s->from_etc_fstab),
589 prefix, yes_no(s->from_proc_swaps),
590 prefix, yes_no(s->from_fragment));
592 if (s->control_pid > 0)
594 "%sControl PID: %lu\n",
595 prefix, (unsigned long) s->control_pid);
597 exec_context_dump(&s->exec_context, f, prefix);
600 static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
608 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
611 if ((r = exec_spawn(c,
615 UNIT(s)->manager->environment,
619 UNIT(s)->manager->confirm_spawn,
620 UNIT(s)->cgroup_bondings,
621 UNIT(s)->cgroup_attributes,
625 if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
626 /* FIXME: we need to do something here */
634 unit_unwatch_timer(UNIT(s), &s->timer_watch);
639 static void swap_enter_dead(Swap *s, bool success) {
645 swap_set_state(s, s->failure ? SWAP_FAILED : SWAP_DEAD);
648 static void swap_enter_active(Swap *s, bool success) {
654 swap_set_state(s, SWAP_ACTIVE);
657 static void swap_enter_signal(Swap *s, SwapState state, bool success) {
660 bool wait_for_exit = false;
667 if (s->exec_context.kill_mode != KILL_NONE) {
668 int sig = (state == SWAP_ACTIVATING_SIGTERM ||
669 state == SWAP_DEACTIVATING_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
671 if (s->control_pid > 0) {
672 if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
674 log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
676 wait_for_exit = true;
679 if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
681 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
686 /* Exclude the control pid from being killed via the cgroup */
687 if (s->control_pid > 0)
688 if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
691 if ((r = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, sig, true, pid_set)) < 0) {
692 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
693 log_warning("Failed to kill control group: %s", strerror(-r));
695 wait_for_exit = true;
703 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
706 swap_set_state(s, state);
708 swap_enter_dead(s, true);
713 log_warning("%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
715 swap_enter_dead(s, false);
721 static void swap_enter_activating(Swap *s) {
726 s->control_command_id = SWAP_EXEC_ACTIVATE;
727 s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
729 if (s->from_fragment)
730 priority = s->parameters_fragment.priority;
731 else if (s->from_etc_fstab)
732 priority = s->parameters_etc_fstab.priority;
739 snprintf(p, sizeof(p), "%i", priority);
742 r = exec_command_set(
750 r = exec_command_set(
759 swap_unwatch_control_pid(s);
761 if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0)
764 swap_set_state(s, SWAP_ACTIVATING);
769 log_warning("%s failed to run 'swapon' task: %s", UNIT(s)->id, strerror(-r));
770 swap_enter_dead(s, false);
773 static void swap_enter_deactivating(Swap *s, bool success) {
781 s->control_command_id = SWAP_EXEC_DEACTIVATE;
782 s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
784 if ((r = exec_command_set(
791 swap_unwatch_control_pid(s);
793 if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0)
796 swap_set_state(s, SWAP_DEACTIVATING);
801 log_warning("%s failed to run 'swapoff' task: %s", UNIT(s)->id, strerror(-r));
802 swap_enter_active(s, false);
805 static int swap_start(Unit *u) {
810 /* We cannot fulfill this request right now, try again later
813 if (s->state == SWAP_DEACTIVATING ||
814 s->state == SWAP_DEACTIVATING_SIGTERM ||
815 s->state == SWAP_DEACTIVATING_SIGKILL ||
816 s->state == SWAP_ACTIVATING_SIGTERM ||
817 s->state == SWAP_ACTIVATING_SIGKILL)
820 if (s->state == SWAP_ACTIVATING)
823 assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED);
826 swap_enter_activating(s);
830 static int swap_stop(Unit *u) {
835 if (s->state == SWAP_DEACTIVATING ||
836 s->state == SWAP_DEACTIVATING_SIGTERM ||
837 s->state == SWAP_DEACTIVATING_SIGKILL ||
838 s->state == SWAP_ACTIVATING_SIGTERM ||
839 s->state == SWAP_ACTIVATING_SIGKILL)
842 assert(s->state == SWAP_ACTIVATING ||
843 s->state == SWAP_ACTIVE);
845 swap_enter_deactivating(s, true);
849 static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
856 unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
857 unit_serialize_item(u, f, "failure", yes_no(s->failure));
859 if (s->control_pid > 0)
860 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
862 if (s->control_command_id >= 0)
863 unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id));
868 static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
874 if (streq(key, "state")) {
877 if ((state = swap_state_from_string(value)) < 0)
878 log_debug("Failed to parse state value %s", value);
880 s->deserialized_state = state;
881 } else if (streq(key, "failure")) {
884 if ((b = parse_boolean(value)) < 0)
885 log_debug("Failed to parse failure value %s", value);
887 s->failure = b || s->failure;
889 } else if (streq(key, "control-pid")) {
892 if (parse_pid(value, &pid) < 0)
893 log_debug("Failed to parse control-pid value %s", value);
895 s->control_pid = pid;
897 } else if (streq(key, "control-command")) {
900 if ((id = swap_exec_command_from_string(value)) < 0)
901 log_debug("Failed to parse exec-command value %s", value);
903 s->control_command_id = id;
904 s->control_command = s->exec_command + id;
908 log_debug("Unknown serialization key '%s'", key);
913 static UnitActiveState swap_active_state(Unit *u) {
916 return state_translation_table[SWAP(u)->state];
919 static const char *swap_sub_state_to_string(Unit *u) {
922 return swap_state_to_string(SWAP(u)->state);
925 static bool swap_check_gc(Unit *u) {
930 return s->from_etc_fstab || s->from_proc_swaps;
933 static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
940 if (pid != s->control_pid)
945 success = is_clean_exit(code, status);
946 s->failure = s->failure || !success;
948 if (s->control_command) {
949 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
950 s->control_command = NULL;
951 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
954 log_full(success ? LOG_DEBUG : LOG_NOTICE,
955 "%s swap process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status);
959 case SWAP_ACTIVATING:
960 case SWAP_ACTIVATING_SIGTERM:
961 case SWAP_ACTIVATING_SIGKILL:
964 swap_enter_active(s, true);
966 swap_enter_dead(s, false);
969 case SWAP_DEACTIVATING:
970 case SWAP_DEACTIVATING_SIGKILL:
971 case SWAP_DEACTIVATING_SIGTERM:
974 swap_enter_dead(s, true);
976 swap_enter_dead(s, false);
980 assert_not_reached("Uh, control process died at wrong time.");
983 /* Notify clients about changed exit status */
984 unit_add_to_dbus_queue(u);
986 /* Request a reload of /proc/swaps, so that following units
987 * can follow our state change */
988 u->manager->request_reload = true;
991 static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
995 assert(elapsed == 1);
996 assert(w == &s->timer_watch);
1000 case SWAP_ACTIVATING:
1001 log_warning("%s activation timed out. Stopping.", u->id);
1002 swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, false);
1005 case SWAP_DEACTIVATING:
1006 log_warning("%s deactivation timed out. Stopping.", u->id);
1007 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, false);
1010 case SWAP_ACTIVATING_SIGTERM:
1011 if (s->exec_context.send_sigkill) {
1012 log_warning("%s activation timed out. Killing.", u->id);
1013 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, false);
1015 log_warning("%s activation timed out. Skipping SIGKILL. Ignoring.", u->id);
1016 swap_enter_dead(s, false);
1020 case SWAP_DEACTIVATING_SIGTERM:
1021 if (s->exec_context.send_sigkill) {
1022 log_warning("%s deactivation timed out. Killing.", u->id);
1023 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, false);
1025 log_warning("%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->id);
1026 swap_enter_dead(s, false);
1030 case SWAP_ACTIVATING_SIGKILL:
1031 case SWAP_DEACTIVATING_SIGKILL:
1032 log_warning("%s swap process still around after SIGKILL. Ignoring.", u->id);
1033 swap_enter_dead(s, false);
1037 assert_not_reached("Timeout at wrong time.");
1041 static int swap_load_proc_swaps(Manager *m, bool set_flags) {
1047 rewind(m->proc_swaps);
1049 (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
1052 char *dev = NULL, *d;
1055 if ((k = fscanf(m->proc_swaps,
1056 "%ms " /* device/file */
1057 "%*s " /* type of swap */
1058 "%*s " /* swap size */
1060 "%i\n", /* priority */
1061 &dev, &prio)) != 2) {
1066 log_warning("Failed to parse /proc/swaps:%u.", i);
1077 k = swap_process_new_swap(m, d, prio, set_flags);
1087 int swap_dispatch_reload(Manager *m) {
1088 /* This function should go as soon as the kernel properly notifies us */
1090 if (_likely_(!m->request_reload))
1093 m->request_reload = false;
1095 return swap_fd_event(m, EPOLLPRI);
1098 int swap_fd_event(Manager *m, int events) {
1103 assert(events & EPOLLPRI);
1105 if ((r = swap_load_proc_swaps(m, true)) < 0) {
1106 log_error("Failed to reread /proc/swaps: %s", strerror(-r));
1108 /* Reset flags, just in case, for late calls */
1109 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1110 Swap *swap = SWAP(u);
1112 swap->is_active = swap->just_activated = false;
1118 manager_dispatch_load_queue(m);
1120 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1121 Swap *swap = SWAP(u);
1123 if (!swap->is_active) {
1124 /* This has just been deactivated */
1126 swap->from_proc_swaps = false;
1127 swap_unset_proc_swaps(swap);
1129 switch (swap->state) {
1132 swap_enter_dead(swap, true);
1136 swap_set_state(swap, swap->state);
1140 } else if (swap->just_activated) {
1142 /* New swap entry */
1144 switch (swap->state) {
1148 swap_enter_active(swap, true);
1152 /* Nothing really changed, but let's
1153 * issue an notification call
1154 * nonetheless, in case somebody is
1155 * waiting for this. */
1156 swap_set_state(swap, swap->state);
1161 /* Reset the flags for later calls */
1162 swap->is_active = swap->just_activated = false;
1168 static Unit *swap_following(Unit *u) {
1170 Swap *other, *first = NULL;
1174 if (streq_ptr(s->what, s->parameters_proc_swaps.what))
1177 /* Make everybody follow the unit that's named after the swap
1178 * device in the kernel */
1180 LIST_FOREACH_AFTER(same_proc_swaps, other, s)
1181 if (streq_ptr(other->what, other->parameters_proc_swaps.what))
1184 LIST_FOREACH_BEFORE(same_proc_swaps, other, s) {
1185 if (streq_ptr(other->what, other->parameters_proc_swaps.what))
1194 static int swap_following_set(Unit *u, Set **_set) {
1203 if (LIST_JUST_US(same_proc_swaps, s)) {
1208 if (!(set = set_new(NULL, NULL)))
1211 LIST_FOREACH_AFTER(same_proc_swaps, other, s)
1212 if ((r = set_put(set, other)) < 0)
1215 LIST_FOREACH_BEFORE(same_proc_swaps, other, s)
1216 if ((r = set_put(set, other)) < 0)
1227 static void swap_shutdown(Manager *m) {
1230 if (m->proc_swaps) {
1231 fclose(m->proc_swaps);
1232 m->proc_swaps = NULL;
1235 hashmap_free(m->swaps_by_proc_swaps);
1236 m->swaps_by_proc_swaps = NULL;
1239 static int swap_enumerate(Manager *m) {
1241 struct epoll_event ev;
1244 if (!m->proc_swaps) {
1245 if (!(m->proc_swaps = fopen("/proc/swaps", "re")))
1246 return (errno == ENOENT) ? 0 : -errno;
1248 m->swap_watch.type = WATCH_SWAP;
1249 m->swap_watch.fd = fileno(m->proc_swaps);
1252 ev.events = EPOLLPRI;
1253 ev.data.ptr = &m->swap_watch;
1255 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0)
1259 /* We rely on mount.c to load /etc/fstab for us */
1261 if ((r = swap_load_proc_swaps(m, false)) < 0)
1267 static void swap_reset_failed(Unit *u) {
1272 if (s->state == SWAP_FAILED)
1273 swap_set_state(s, SWAP_DEAD);
1278 static int swap_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1281 Set *pid_set = NULL;
1285 if (who == KILL_MAIN) {
1286 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes");
1290 if (s->control_pid <= 0 && who == KILL_CONTROL) {
1291 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1295 if (who == KILL_CONTROL || who == KILL_ALL)
1296 if (s->control_pid > 0)
1297 if (kill(s->control_pid, signo) < 0)
1300 if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
1303 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1306 /* Exclude the control pid from being killed via the cgroup */
1307 if (s->control_pid > 0)
1308 if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
1313 if ((q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, pid_set)) < 0)
1314 if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
1325 static const char* const swap_state_table[_SWAP_STATE_MAX] = {
1326 [SWAP_DEAD] = "dead",
1327 [SWAP_ACTIVATING] = "activating",
1328 [SWAP_ACTIVE] = "active",
1329 [SWAP_DEACTIVATING] = "deactivating",
1330 [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm",
1331 [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill",
1332 [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm",
1333 [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill",
1334 [SWAP_FAILED] = "failed"
1337 DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
1339 static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
1340 [SWAP_EXEC_ACTIVATE] = "ExecActivate",
1341 [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
1344 DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
1346 const UnitVTable swap_vtable = {
1348 .object_size = sizeof(Swap),
1355 .no_instances = true,
1356 .show_status = true,
1362 .coldplug = swap_coldplug,
1366 .start = swap_start,
1371 .serialize = swap_serialize,
1372 .deserialize_item = swap_deserialize_item,
1374 .active_state = swap_active_state,
1375 .sub_state_to_string = swap_sub_state_to_string,
1377 .check_gc = swap_check_gc,
1379 .sigchld_event = swap_sigchld_event,
1380 .timer_event = swap_timer_event,
1382 .reset_failed = swap_reset_failed,
1384 .bus_interface = "org.freedesktop.systemd1.Swap",
1385 .bus_message_handler = bus_swap_message_handler,
1386 .bus_invalidating_properties = bus_swap_invalidating_properties,
1388 .following = swap_following,
1389 .following_set = swap_following_set,
1391 .enumerate = swap_enumerate,
1392 .shutdown = swap_shutdown