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/>.
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 #include "path-util.h"
43 #include "udev-util.h"
45 static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
46 [SWAP_DEAD] = UNIT_INACTIVE,
47 [SWAP_ACTIVATING] = UNIT_ACTIVATING,
48 [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE,
49 [SWAP_ACTIVE] = UNIT_ACTIVE,
50 [SWAP_DEACTIVATING] = UNIT_DEACTIVATING,
51 [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
52 [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
53 [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
54 [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
55 [SWAP_FAILED] = UNIT_FAILED
58 static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
59 static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
61 static void swap_unset_proc_swaps(Swap *s) {
64 if (!s->from_proc_swaps)
67 free(s->parameters_proc_swaps.what);
68 s->parameters_proc_swaps.what = NULL;
70 s->from_proc_swaps = false;
73 static int swap_set_devnode(Swap *s, const char *devnode) {
80 r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, string_hash_func, string_compare_func);
84 swaps = UNIT(s)->manager->swaps_by_devnode;
87 first = hashmap_get(swaps, s->devnode);
89 LIST_REMOVE(same_devnode, first, s);
91 hashmap_replace(swaps, first->devnode, first);
93 hashmap_remove(swaps, s->devnode);
100 s->devnode = strdup(devnode);
104 first = hashmap_get(swaps, s->devnode);
105 LIST_PREPEND(same_devnode, first, s);
107 return hashmap_replace(swaps, first->devnode, first);
113 static void swap_init(Unit *u) {
117 assert(UNIT(s)->load_state == UNIT_STUB);
119 s->timeout_usec = u->manager->default_timeout_start_usec;
121 exec_context_init(&s->exec_context);
122 s->exec_context.std_output = u->manager->default_std_output;
123 s->exec_context.std_error = u->manager->default_std_error;
124 kill_context_init(&s->kill_context);
125 cgroup_context_init(&s->cgroup_context);
127 s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1;
129 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
131 u->ignore_on_isolate = true;
134 static void swap_unwatch_control_pid(Swap *s) {
137 if (s->control_pid <= 0)
140 unit_unwatch_pid(UNIT(s), s->control_pid);
144 static void swap_done(Unit *u) {
149 swap_unset_proc_swaps(s);
150 swap_set_devnode(s, NULL);
155 free(s->parameters_fragment.what);
156 s->parameters_fragment.what = NULL;
158 cgroup_context_done(&s->cgroup_context);
159 exec_context_done(&s->exec_context);
160 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
161 exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
162 s->control_command = NULL;
164 swap_unwatch_control_pid(s);
166 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
169 static int swap_arm_timer(Swap *s) {
174 if (s->timeout_usec <= 0) {
175 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
179 if (s->timer_event_source) {
180 r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_usec);
184 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
187 return sd_event_add_monotonic(UNIT(s)->manager->event, now(CLOCK_MONOTONIC) + s->timeout_usec, 0, swap_dispatch_timer, s, &s->timer_event_source);
190 static int swap_add_device_links(Swap *s) {
198 if (s->from_fragment)
199 p = &s->parameters_fragment;
203 if (is_device_path(s->what))
204 return unit_add_node_link(UNIT(s), s->what, !p->noauto && UNIT(s)->manager->running_as == SYSTEMD_SYSTEM);
206 /* File based swap devices need to be ordered after
207 * systemd-remount-fs.service, since they might need a
208 * writable file system. */
209 return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true);
212 static int swap_add_default_dependencies(Swap *s) {
213 bool nofail = false, noauto = false;
218 if (UNIT(s)->manager->running_as != SYSTEMD_SYSTEM)
221 if (detect_container(NULL) > 0)
224 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
228 if (s->from_fragment) {
229 SwapParameters *p = &s->parameters_fragment;
237 r = unit_add_dependency_by_name_inverse(UNIT(s), UNIT_WANTS, SPECIAL_SWAP_TARGET, NULL, true);
239 r = unit_add_two_dependencies_by_name_inverse(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SWAP_TARGET, NULL, true);
247 static int swap_verify(Swap *s) {
249 _cleanup_free_ char *e = NULL;
251 if (UNIT(s)->load_state != UNIT_LOADED)
254 e = unit_name_from_path(s->what, ".swap");
258 b = unit_has_name(UNIT(s), e);
260 log_error_unit(UNIT(s)->id, "%s: Value of \"What\" and unit name do not match, not loading.", UNIT(s)->id);
264 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
265 log_error_unit(UNIT(s)->id, "%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load.", UNIT(s)->id);
272 static int swap_load_devnode(Swap *s) {
273 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
279 if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode))
282 d = udev_device_new_from_devnum(UNIT(s)->manager->udev, 'b', st.st_rdev);
286 p = udev_device_get_devnode(d);
290 return swap_set_devnode(s, p);
293 static int swap_load(Unit *u) {
298 assert(u->load_state == UNIT_STUB);
300 /* Load a .swap file */
301 r = unit_load_fragment_and_dropin_optional(u);
305 if (u->load_state == UNIT_LOADED) {
306 r = unit_add_exec_dependencies(u, &s->exec_context);
310 if (UNIT(s)->fragment_path)
311 s->from_fragment = true;
314 if (s->parameters_fragment.what)
315 s->what = strdup(s->parameters_fragment.what);
316 else if (s->parameters_proc_swaps.what)
317 s->what = strdup(s->parameters_proc_swaps.what);
319 s->what = unit_name_to_path(u->id);
325 path_kill_slashes(s->what);
327 if (!UNIT(s)->description) {
328 r = unit_set_description(u, s->what);
333 r = unit_require_mounts_for(UNIT(s), s->what);
337 r = swap_add_device_links(s);
341 r = swap_load_devnode(s);
345 r = unit_add_default_slice(u);
349 if (UNIT(s)->default_dependencies) {
350 r = swap_add_default_dependencies(s);
355 r = unit_exec_context_defaults(u, &s->exec_context);
360 return swap_verify(s);
363 static int swap_add_one(
366 const char *what_proc_swaps,
372 _cleanup_free_ char *e = NULL;
380 assert(what_proc_swaps);
382 e = unit_name_from_path(what, ".swap");
386 u = manager_get_unit(m, e);
389 SWAP(u)->from_proc_swaps &&
390 !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps))
396 u = unit_new(m, sizeof(Swap));
400 r = unit_add_name(u, e);
404 SWAP(u)->what = strdup(what);
405 if (!SWAP(u)->what) {
410 unit_add_to_load_queue(u);
414 p = &SWAP(u)->parameters_proc_swaps;
417 p->what = strdup(what_proc_swaps);
425 SWAP(u)->is_active = true;
426 SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps;
429 SWAP(u)->from_proc_swaps = true;
431 p->priority = priority;
435 unit_add_to_dbus_queue(u);
440 log_warning_unit(e, "Failed to load swap unit: %s", strerror(-r));
448 static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) {
449 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
450 struct udev_list_entry *item = NULL, *first = NULL;
457 r = swap_add_one(m, device, device, prio, false, false, set_flags);
461 /* If this is a block device, then let's add duplicates for
462 * all other names of this block device */
463 if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode))
466 d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev);
470 /* Add the main device node */
471 dn = udev_device_get_devnode(d);
472 if (dn && !streq(dn, device))
473 swap_add_one(m, dn, device, prio, false, false, set_flags);
475 /* Add additional units for all symlinks */
476 first = udev_device_get_devlinks_list_entry(d);
477 udev_list_entry_foreach(item, first) {
480 /* Don't bother with the /dev/block links */
481 p = udev_list_entry_get_name(item);
483 if (streq(p, device))
486 if (path_startswith(p, "/dev/block/"))
489 if (stat(p, &st) >= 0)
490 if (!S_ISBLK(st.st_mode) ||
491 st.st_rdev != udev_device_get_devnum(d))
494 swap_add_one(m, p, device, prio, false, false, set_flags);
500 static void swap_set_state(Swap *s, SwapState state) {
505 old_state = s->state;
508 if (state != SWAP_ACTIVATING &&
509 state != SWAP_ACTIVATING_SIGTERM &&
510 state != SWAP_ACTIVATING_SIGKILL &&
511 state != SWAP_ACTIVATING_DONE &&
512 state != SWAP_DEACTIVATING &&
513 state != SWAP_DEACTIVATING_SIGTERM &&
514 state != SWAP_DEACTIVATING_SIGKILL) {
515 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
516 swap_unwatch_control_pid(s);
517 s->control_command = NULL;
518 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
521 if (state != old_state)
522 log_debug_unit(UNIT(s)->id,
523 "%s changed %s -> %s",
525 swap_state_to_string(old_state),
526 swap_state_to_string(state));
528 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
531 static int swap_coldplug(Unit *u) {
533 SwapState new_state = SWAP_DEAD;
537 assert(s->state == SWAP_DEAD);
539 if (s->deserialized_state != s->state)
540 new_state = s->deserialized_state;
541 else if (s->from_proc_swaps)
542 new_state = SWAP_ACTIVE;
544 if (new_state == s->state)
547 if (new_state == SWAP_ACTIVATING ||
548 new_state == SWAP_ACTIVATING_SIGTERM ||
549 new_state == SWAP_ACTIVATING_SIGKILL ||
550 new_state == SWAP_ACTIVATING_DONE ||
551 new_state == SWAP_DEACTIVATING ||
552 new_state == SWAP_DEACTIVATING_SIGTERM ||
553 new_state == SWAP_DEACTIVATING_SIGKILL) {
555 if (s->control_pid <= 0)
558 r = unit_watch_pid(UNIT(s), s->control_pid);
562 r = swap_arm_timer(s);
567 swap_set_state(s, new_state);
571 static void swap_dump(Unit *u, FILE *f, const char *prefix) {
578 if (s->from_proc_swaps)
579 p = &s->parameters_proc_swaps;
580 else if (s->from_fragment)
581 p = &s->parameters_fragment;
589 "%sFrom /proc/swaps: %s\n"
590 "%sFrom fragment: %s\n",
591 prefix, swap_state_to_string(s->state),
592 prefix, swap_result_to_string(s->result),
594 prefix, yes_no(s->from_proc_swaps),
595 prefix, yes_no(s->from_fragment));
598 fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode);
606 prefix, yes_no(p->noauto),
607 prefix, yes_no(p->nofail));
609 if (s->control_pid > 0)
611 "%sControl PID: %lu\n",
612 prefix, (unsigned long) s->control_pid);
614 exec_context_dump(&s->exec_context, f, prefix);
615 kill_context_dump(&s->kill_context, f, prefix);
618 static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
626 unit_realize_cgroup(UNIT(s));
628 r = unit_setup_exec_runtime(UNIT(s));
632 r = swap_arm_timer(s);
640 UNIT(s)->manager->environment,
644 UNIT(s)->manager->confirm_spawn,
645 UNIT(s)->manager->cgroup_supported,
646 UNIT(s)->cgroup_path,
655 r = unit_watch_pid(UNIT(s), pid);
657 /* FIXME: we need to do something here */
665 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
670 static void swap_enter_dead(Swap *s, SwapResult f) {
673 if (f != SWAP_SUCCESS)
676 exec_runtime_destroy(s->exec_runtime);
677 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
679 swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD);
682 static void swap_enter_active(Swap *s, SwapResult f) {
685 if (f != SWAP_SUCCESS)
688 swap_set_state(s, SWAP_ACTIVE);
691 static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) {
696 if (f != SWAP_SUCCESS)
699 r = unit_kill_context(
702 state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM,
710 r = swap_arm_timer(s);
714 swap_set_state(s, state);
716 swap_enter_dead(s, SWAP_SUCCESS);
721 log_warning_unit(UNIT(s)->id,
722 "%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
724 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
727 static void swap_enter_activating(Swap *s) {
732 s->control_command_id = SWAP_EXEC_ACTIVATE;
733 s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
735 if (s->from_fragment)
736 priority = s->parameters_fragment.priority;
741 char p[DECIMAL_STR_MAX(int)];
743 sprintf(p, "%i", priority);
745 r = exec_command_set(
753 r = exec_command_set(
762 swap_unwatch_control_pid(s);
764 r = swap_spawn(s, s->control_command, &s->control_pid);
768 swap_set_state(s, SWAP_ACTIVATING);
773 log_warning_unit(UNIT(s)->id,
774 "%s failed to run 'swapon' task: %s",
775 UNIT(s)->id, strerror(-r));
776 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
779 static void swap_enter_deactivating(Swap *s) {
784 s->control_command_id = SWAP_EXEC_DEACTIVATE;
785 s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
787 r = exec_command_set(s->control_command,
794 swap_unwatch_control_pid(s);
796 r = swap_spawn(s, s->control_command, &s->control_pid);
800 swap_set_state(s, SWAP_DEACTIVATING);
805 log_warning_unit(UNIT(s)->id,
806 "%s failed to run 'swapoff' task: %s",
807 UNIT(s)->id, strerror(-r));
808 swap_enter_active(s, SWAP_FAILURE_RESOURCES);
811 static int swap_start(Unit *u) {
816 /* We cannot fulfill this request right now, try again later
819 if (s->state == SWAP_DEACTIVATING ||
820 s->state == SWAP_DEACTIVATING_SIGTERM ||
821 s->state == SWAP_DEACTIVATING_SIGKILL ||
822 s->state == SWAP_ACTIVATING_SIGTERM ||
823 s->state == SWAP_ACTIVATING_SIGKILL)
826 if (s->state == SWAP_ACTIVATING)
829 assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED);
831 if (detect_container(NULL) > 0)
834 s->result = SWAP_SUCCESS;
835 swap_enter_activating(s);
839 static int swap_stop(Unit *u) {
844 if (s->state == SWAP_DEACTIVATING ||
845 s->state == SWAP_DEACTIVATING_SIGTERM ||
846 s->state == SWAP_DEACTIVATING_SIGKILL ||
847 s->state == SWAP_ACTIVATING_SIGTERM ||
848 s->state == SWAP_ACTIVATING_SIGKILL)
851 assert(s->state == SWAP_ACTIVATING ||
852 s->state == SWAP_ACTIVATING_DONE ||
853 s->state == SWAP_ACTIVE);
855 if (detect_container(NULL) > 0)
858 swap_enter_deactivating(s);
862 static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
869 unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
870 unit_serialize_item(u, f, "result", swap_result_to_string(s->result));
872 if (s->control_pid > 0)
873 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
875 if (s->control_command_id >= 0)
876 unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id));
881 static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
887 if (streq(key, "state")) {
890 state = swap_state_from_string(value);
892 log_debug_unit(u->id, "Failed to parse state value %s", value);
894 s->deserialized_state = state;
895 } else if (streq(key, "result")) {
898 f = swap_result_from_string(value);
900 log_debug_unit(u->id, "Failed to parse result value %s", value);
901 else if (f != SWAP_SUCCESS)
903 } else if (streq(key, "control-pid")) {
906 if (parse_pid(value, &pid) < 0)
907 log_debug_unit(u->id, "Failed to parse control-pid value %s", value);
909 s->control_pid = pid;
911 } else if (streq(key, "control-command")) {
914 id = swap_exec_command_from_string(value);
916 log_debug_unit(u->id, "Failed to parse exec-command value %s", value);
918 s->control_command_id = id;
919 s->control_command = s->exec_command + id;
922 log_debug_unit(u->id, "Unknown serialization key '%s'", key);
927 _pure_ static UnitActiveState swap_active_state(Unit *u) {
930 return state_translation_table[SWAP(u)->state];
933 _pure_ static const char *swap_sub_state_to_string(Unit *u) {
936 return swap_state_to_string(SWAP(u)->state);
939 _pure_ static bool swap_check_gc(Unit *u) {
944 return s->from_proc_swaps;
947 static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
954 if (pid != s->control_pid)
959 if (is_clean_exit(code, status, NULL))
961 else if (code == CLD_EXITED)
962 f = SWAP_FAILURE_EXIT_CODE;
963 else if (code == CLD_KILLED)
964 f = SWAP_FAILURE_SIGNAL;
965 else if (code == CLD_DUMPED)
966 f = SWAP_FAILURE_CORE_DUMP;
968 assert_not_reached("Unknown code");
970 if (f != SWAP_SUCCESS)
973 if (s->control_command) {
974 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
976 s->control_command = NULL;
977 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
980 log_full_unit(f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
982 "%s swap process exited, code=%s status=%i",
983 u->id, sigchld_code_to_string(code), status);
987 case SWAP_ACTIVATING:
988 case SWAP_ACTIVATING_DONE:
989 case SWAP_ACTIVATING_SIGTERM:
990 case SWAP_ACTIVATING_SIGKILL:
992 if (f == SWAP_SUCCESS)
993 swap_enter_active(s, f);
995 swap_enter_dead(s, f);
998 case SWAP_DEACTIVATING:
999 case SWAP_DEACTIVATING_SIGKILL:
1000 case SWAP_DEACTIVATING_SIGTERM:
1002 swap_enter_dead(s, f);
1006 assert_not_reached("Uh, control process died at wrong time.");
1009 /* Notify clients about changed exit status */
1010 unit_add_to_dbus_queue(u);
1013 static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1014 Swap *s = SWAP(userdata);
1017 assert(s->timer_event_source == source);
1021 case SWAP_ACTIVATING:
1022 case SWAP_ACTIVATING_DONE:
1023 log_warning_unit(UNIT(s)->id, "%s activation timed out. Stopping.", UNIT(s)->id);
1024 swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1027 case SWAP_DEACTIVATING:
1028 log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Stopping.", UNIT(s)->id);
1029 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1032 case SWAP_ACTIVATING_SIGTERM:
1033 if (s->kill_context.send_sigkill) {
1034 log_warning_unit(UNIT(s)->id, "%s activation timed out. Killing.", UNIT(s)->id);
1035 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1037 log_warning_unit(UNIT(s)->id, "%s activation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
1038 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1042 case SWAP_DEACTIVATING_SIGTERM:
1043 if (s->kill_context.send_sigkill) {
1044 log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Killing.", UNIT(s)->id);
1045 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1047 log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
1048 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1052 case SWAP_ACTIVATING_SIGKILL:
1053 case SWAP_DEACTIVATING_SIGKILL:
1054 log_warning_unit(UNIT(s)->id, "%s swap process still around after SIGKILL. Ignoring.", UNIT(s)->id);
1055 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1059 assert_not_reached("Timeout at wrong time.");
1065 static int swap_load_proc_swaps(Manager *m, bool set_flags) {
1071 rewind(m->proc_swaps);
1073 (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
1076 _cleanup_free_ char *dev = NULL, *d = NULL;
1079 k = fscanf(m->proc_swaps,
1080 "%ms " /* device/file */
1081 "%*s " /* type of swap */
1082 "%*s " /* swap size */
1084 "%i\n", /* priority */
1090 log_warning("Failed to parse /proc/swaps:%u", i);
1098 k = swap_process_new_swap(m, d, prio, set_flags);
1106 static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1107 Manager *m = userdata;
1112 assert(revents & EPOLLPRI);
1114 r = swap_load_proc_swaps(m, true);
1116 log_error("Failed to reread /proc/swaps: %s", strerror(-r));
1118 /* Reset flags, just in case, for late calls */
1119 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1120 Swap *swap = SWAP(u);
1122 swap->is_active = swap->just_activated = false;
1128 manager_dispatch_load_queue(m);
1130 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1131 Swap *swap = SWAP(u);
1133 if (!swap->is_active) {
1134 /* This has just been deactivated */
1136 swap_unset_proc_swaps(swap);
1138 switch (swap->state) {
1141 swap_enter_dead(swap, SWAP_SUCCESS);
1146 swap_set_state(swap, swap->state);
1150 } else if (swap->just_activated) {
1152 /* New swap entry */
1154 switch (swap->state) {
1158 swap_enter_active(swap, SWAP_SUCCESS);
1161 case SWAP_ACTIVATING:
1162 swap_set_state(swap, SWAP_ACTIVATING_DONE);
1166 /* Nothing really changed, but let's
1167 * issue an notification call
1168 * nonetheless, in case somebody is
1169 * waiting for this. */
1170 swap_set_state(swap, swap->state);
1175 /* Reset the flags for later calls */
1176 swap->is_active = swap->just_activated = false;
1182 static Unit *swap_following(Unit *u) {
1184 Swap *other, *first = NULL;
1188 if (streq_ptr(s->what, s->devnode))
1191 /* Make everybody follow the unit that's named after the swap
1192 * device in the kernel */
1194 LIST_FOREACH_AFTER(same_devnode, other, s)
1195 if (streq_ptr(other->what, other->devnode))
1198 LIST_FOREACH_BEFORE(same_devnode, other, s) {
1199 if (streq_ptr(other->what, other->devnode))
1208 static int swap_following_set(Unit *u, Set **_set) {
1209 Swap *s = SWAP(u), *other;
1216 if (LIST_JUST_US(same_devnode, s)) {
1221 set = set_new(NULL, NULL);
1225 LIST_FOREACH_AFTER(same_devnode, other, s) {
1226 r = set_put(set, other);
1231 LIST_FOREACH_BEFORE(same_devnode, other, s) {
1232 r = set_put(set, other);
1245 static void swap_shutdown(Manager *m) {
1248 m->swap_event_source = sd_event_source_unref(m->swap_event_source);
1250 if (m->proc_swaps) {
1251 fclose(m->proc_swaps);
1252 m->proc_swaps = NULL;
1255 hashmap_free(m->swaps_by_devnode);
1256 m->swaps_by_devnode = NULL;
1259 static int swap_enumerate(Manager *m) {
1264 if (!m->proc_swaps) {
1265 m->proc_swaps = fopen("/proc/swaps", "re");
1267 return errno == ENOENT ? 0 : -errno;
1269 r = sd_event_add_io(m->event, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m, &m->swap_event_source);
1273 /* Dispatch this before we dispatch SIGCHLD, so that
1274 * we always get the events from /proc/swaps before
1275 * the SIGCHLD of /sbin/swapon. */
1276 r = sd_event_source_set_priority(m->swap_event_source, -10);
1281 r = swap_load_proc_swaps(m, false);
1292 int swap_process_new_device(Manager *m, struct udev_device *dev) {
1293 struct udev_list_entry *item = NULL, *first = NULL;
1294 _cleanup_free_ char *e = NULL;
1302 dn = udev_device_get_devnode(dev);
1306 e = unit_name_from_path(dn, ".swap");
1310 s = hashmap_get(m->units, e);
1312 r = swap_set_devnode(s, dn);
1314 first = udev_device_get_devlinks_list_entry(dev);
1315 udev_list_entry_foreach(item, first) {
1316 _cleanup_free_ char *n = NULL;
1318 n = unit_name_from_path(udev_list_entry_get_name(item), ".swap");
1322 s = hashmap_get(m->units, n);
1326 q = swap_set_devnode(s, dn);
1335 int swap_process_removed_device(Manager *m, struct udev_device *dev) {
1340 dn = udev_device_get_devnode(dev);
1344 while ((s = hashmap_get(m->swaps_by_devnode, dn))) {
1347 q = swap_set_devnode(s, NULL);
1355 static void swap_reset_failed(Unit *u) {
1360 if (s->state == SWAP_FAILED)
1361 swap_set_state(s, SWAP_DEAD);
1363 s->result = SWAP_SUCCESS;
1366 static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1367 return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error);
1370 static const char* const swap_state_table[_SWAP_STATE_MAX] = {
1371 [SWAP_DEAD] = "dead",
1372 [SWAP_ACTIVATING] = "activating",
1373 [SWAP_ACTIVATING_DONE] = "activating-done",
1374 [SWAP_ACTIVE] = "active",
1375 [SWAP_DEACTIVATING] = "deactivating",
1376 [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm",
1377 [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill",
1378 [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm",
1379 [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill",
1380 [SWAP_FAILED] = "failed"
1383 DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
1385 static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
1386 [SWAP_EXEC_ACTIVATE] = "ExecActivate",
1387 [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
1390 DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
1392 static const char* const swap_result_table[_SWAP_RESULT_MAX] = {
1393 [SWAP_SUCCESS] = "success",
1394 [SWAP_FAILURE_RESOURCES] = "resources",
1395 [SWAP_FAILURE_TIMEOUT] = "timeout",
1396 [SWAP_FAILURE_EXIT_CODE] = "exit-code",
1397 [SWAP_FAILURE_SIGNAL] = "signal",
1398 [SWAP_FAILURE_CORE_DUMP] = "core-dump"
1401 DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult);
1403 const UnitVTable swap_vtable = {
1404 .object_size = sizeof(Swap),
1405 .exec_context_offset = offsetof(Swap, exec_context),
1406 .cgroup_context_offset = offsetof(Swap, cgroup_context),
1407 .kill_context_offset = offsetof(Swap, kill_context),
1408 .exec_runtime_offset = offsetof(Swap, exec_runtime),
1414 .private_section = "Swap",
1417 .no_instances = true,
1423 .coldplug = swap_coldplug,
1427 .start = swap_start,
1432 .serialize = swap_serialize,
1433 .deserialize_item = swap_deserialize_item,
1435 .active_state = swap_active_state,
1436 .sub_state_to_string = swap_sub_state_to_string,
1438 .check_gc = swap_check_gc,
1440 .sigchld_event = swap_sigchld_event,
1442 .reset_failed = swap_reset_failed,
1444 .bus_interface = "org.freedesktop.systemd1.Swap",
1445 .bus_vtable = bus_swap_vtable,
1446 .bus_set_property = bus_swap_set_property,
1447 .bus_commit_properties = bus_swap_commit_properties,
1449 .following = swap_following,
1450 .following_set = swap_following_set,
1452 .enumerate = swap_enumerate,
1453 .shutdown = swap_shutdown,
1455 .status_message_formats = {
1456 .starting_stopping = {
1457 [0] = "Activating swap %s...",
1458 [1] = "Deactivating swap %s...",
1460 .finished_start_job = {
1461 [JOB_DONE] = "Activated swap %s.",
1462 [JOB_FAILED] = "Failed to activate swap %s.",
1463 [JOB_DEPENDENCY] = "Dependency failed for %s.",
1464 [JOB_TIMEOUT] = "Timed out activating swap %s.",
1466 .finished_stop_job = {
1467 [JOB_DONE] = "Deactivated swap %s.",
1468 [JOB_FAILED] = "Failed deactivating swap %s.",
1469 [JOB_TIMEOUT] = "Timed out deactivating swap %s.",