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 exec_context_done(&s->exec_context, manager_is_reloading_or_reexecuting(u->manager));
159 exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
160 s->control_command = NULL;
162 cgroup_context_done(&s->cgroup_context);
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 = swap_arm_timer(s);
636 UNIT(s)->manager->environment,
640 UNIT(s)->manager->confirm_spawn,
641 UNIT(s)->manager->cgroup_supported,
642 UNIT(s)->cgroup_path,
649 r = unit_watch_pid(UNIT(s), pid);
651 /* FIXME: we need to do something here */
659 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
664 static void swap_enter_dead(Swap *s, SwapResult f) {
667 if (f != SWAP_SUCCESS)
670 exec_context_tmp_dirs_done(&s->exec_context);
671 swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD);
674 static void swap_enter_active(Swap *s, SwapResult f) {
677 if (f != SWAP_SUCCESS)
680 swap_set_state(s, SWAP_ACTIVE);
683 static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) {
688 if (f != SWAP_SUCCESS)
691 r = unit_kill_context(
694 state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM,
702 r = swap_arm_timer(s);
706 swap_set_state(s, state);
708 swap_enter_dead(s, SWAP_SUCCESS);
713 log_warning_unit(UNIT(s)->id,
714 "%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
716 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
719 static void swap_enter_activating(Swap *s) {
724 s->control_command_id = SWAP_EXEC_ACTIVATE;
725 s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
727 if (s->from_fragment)
728 priority = s->parameters_fragment.priority;
733 char p[DECIMAL_STR_MAX(int)];
735 sprintf(p, "%i", priority);
737 r = exec_command_set(
745 r = exec_command_set(
754 swap_unwatch_control_pid(s);
756 r = swap_spawn(s, s->control_command, &s->control_pid);
760 swap_set_state(s, SWAP_ACTIVATING);
765 log_warning_unit(UNIT(s)->id,
766 "%s failed to run 'swapon' task: %s",
767 UNIT(s)->id, strerror(-r));
768 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
771 static void swap_enter_deactivating(Swap *s) {
776 s->control_command_id = SWAP_EXEC_DEACTIVATE;
777 s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
779 r = exec_command_set(s->control_command,
786 swap_unwatch_control_pid(s);
788 r = swap_spawn(s, s->control_command, &s->control_pid);
792 swap_set_state(s, SWAP_DEACTIVATING);
797 log_warning_unit(UNIT(s)->id,
798 "%s failed to run 'swapoff' task: %s",
799 UNIT(s)->id, strerror(-r));
800 swap_enter_active(s, SWAP_FAILURE_RESOURCES);
803 static int swap_start(Unit *u) {
808 /* We cannot fulfill this request right now, try again later
811 if (s->state == SWAP_DEACTIVATING ||
812 s->state == SWAP_DEACTIVATING_SIGTERM ||
813 s->state == SWAP_DEACTIVATING_SIGKILL ||
814 s->state == SWAP_ACTIVATING_SIGTERM ||
815 s->state == SWAP_ACTIVATING_SIGKILL)
818 if (s->state == SWAP_ACTIVATING)
821 assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED);
823 if (detect_container(NULL) > 0)
826 s->result = SWAP_SUCCESS;
827 swap_enter_activating(s);
831 static int swap_stop(Unit *u) {
836 if (s->state == SWAP_DEACTIVATING ||
837 s->state == SWAP_DEACTIVATING_SIGTERM ||
838 s->state == SWAP_DEACTIVATING_SIGKILL ||
839 s->state == SWAP_ACTIVATING_SIGTERM ||
840 s->state == SWAP_ACTIVATING_SIGKILL)
843 assert(s->state == SWAP_ACTIVATING ||
844 s->state == SWAP_ACTIVATING_DONE ||
845 s->state == SWAP_ACTIVE);
847 if (detect_container(NULL) > 0)
850 swap_enter_deactivating(s);
854 static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
861 unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
862 unit_serialize_item(u, f, "result", swap_result_to_string(s->result));
864 if (s->control_pid > 0)
865 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
867 if (s->control_command_id >= 0)
868 unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id));
870 exec_context_serialize(&s->exec_context, UNIT(s), f);
875 static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
881 if (streq(key, "state")) {
884 state = swap_state_from_string(value);
886 log_debug_unit(u->id, "Failed to parse state value %s", value);
888 s->deserialized_state = state;
889 } else if (streq(key, "result")) {
892 f = swap_result_from_string(value);
894 log_debug_unit(u->id, "Failed to parse result value %s", value);
895 else if (f != SWAP_SUCCESS)
897 } else if (streq(key, "control-pid")) {
900 if (parse_pid(value, &pid) < 0)
901 log_debug_unit(u->id, "Failed to parse control-pid value %s", value);
903 s->control_pid = pid;
905 } else if (streq(key, "control-command")) {
908 id = swap_exec_command_from_string(value);
910 log_debug_unit(u->id, "Failed to parse exec-command value %s", value);
912 s->control_command_id = id;
913 s->control_command = s->exec_command + id;
915 } else if (streq(key, "tmp-dir")) {
922 s->exec_context.tmp_dir = t;
923 } else if (streq(key, "var-tmp-dir")) {
930 s->exec_context.var_tmp_dir = t;
932 log_debug_unit(u->id, "Unknown serialization key '%s'", key);
937 _pure_ static UnitActiveState swap_active_state(Unit *u) {
940 return state_translation_table[SWAP(u)->state];
943 _pure_ static const char *swap_sub_state_to_string(Unit *u) {
946 return swap_state_to_string(SWAP(u)->state);
949 _pure_ static bool swap_check_gc(Unit *u) {
954 return s->from_proc_swaps;
957 static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
964 if (pid != s->control_pid)
969 if (is_clean_exit(code, status, NULL))
971 else if (code == CLD_EXITED)
972 f = SWAP_FAILURE_EXIT_CODE;
973 else if (code == CLD_KILLED)
974 f = SWAP_FAILURE_SIGNAL;
975 else if (code == CLD_DUMPED)
976 f = SWAP_FAILURE_CORE_DUMP;
978 assert_not_reached("Unknown code");
980 if (f != SWAP_SUCCESS)
983 if (s->control_command) {
984 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
986 s->control_command = NULL;
987 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
990 log_full_unit(f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
992 "%s swap process exited, code=%s status=%i",
993 u->id, sigchld_code_to_string(code), status);
997 case SWAP_ACTIVATING:
998 case SWAP_ACTIVATING_DONE:
999 case SWAP_ACTIVATING_SIGTERM:
1000 case SWAP_ACTIVATING_SIGKILL:
1002 if (f == SWAP_SUCCESS)
1003 swap_enter_active(s, f);
1005 swap_enter_dead(s, f);
1008 case SWAP_DEACTIVATING:
1009 case SWAP_DEACTIVATING_SIGKILL:
1010 case SWAP_DEACTIVATING_SIGTERM:
1012 if (f == SWAP_SUCCESS)
1013 swap_enter_dead(s, f);
1015 swap_enter_dead(s, f);
1019 assert_not_reached("Uh, control process died at wrong time.");
1022 /* Notify clients about changed exit status */
1023 unit_add_to_dbus_queue(u);
1026 static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1027 Swap *s = SWAP(userdata);
1030 assert(s->timer_event_source == source);
1034 case SWAP_ACTIVATING:
1035 case SWAP_ACTIVATING_DONE:
1036 log_warning_unit(UNIT(s)->id, "%s activation timed out. Stopping.", UNIT(s)->id);
1037 swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1040 case SWAP_DEACTIVATING:
1041 log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Stopping.", UNIT(s)->id);
1042 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1045 case SWAP_ACTIVATING_SIGTERM:
1046 if (s->kill_context.send_sigkill) {
1047 log_warning_unit(UNIT(s)->id, "%s activation timed out. Killing.", UNIT(s)->id);
1048 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1050 log_warning_unit(UNIT(s)->id, "%s activation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
1051 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1055 case SWAP_DEACTIVATING_SIGTERM:
1056 if (s->kill_context.send_sigkill) {
1057 log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Killing.", UNIT(s)->id);
1058 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1060 log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
1061 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1065 case SWAP_ACTIVATING_SIGKILL:
1066 case SWAP_DEACTIVATING_SIGKILL:
1067 log_warning_unit(UNIT(s)->id, "%s swap process still around after SIGKILL. Ignoring.", UNIT(s)->id);
1068 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1072 assert_not_reached("Timeout at wrong time.");
1078 static int swap_load_proc_swaps(Manager *m, bool set_flags) {
1084 rewind(m->proc_swaps);
1086 (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
1089 _cleanup_free_ char *dev = NULL, *d = NULL;
1092 k = fscanf(m->proc_swaps,
1093 "%ms " /* device/file */
1094 "%*s " /* type of swap */
1095 "%*s " /* swap size */
1097 "%i\n", /* priority */
1103 log_warning("Failed to parse /proc/swaps:%u", i);
1111 k = swap_process_new_swap(m, d, prio, set_flags);
1119 static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1120 Manager *m = userdata;
1125 assert(revents & EPOLLPRI);
1127 r = swap_load_proc_swaps(m, true);
1129 log_error("Failed to reread /proc/swaps: %s", strerror(-r));
1131 /* Reset flags, just in case, for late calls */
1132 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1133 Swap *swap = SWAP(u);
1135 swap->is_active = swap->just_activated = false;
1141 manager_dispatch_load_queue(m);
1143 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1144 Swap *swap = SWAP(u);
1146 if (!swap->is_active) {
1147 /* This has just been deactivated */
1149 swap_unset_proc_swaps(swap);
1151 switch (swap->state) {
1154 swap_enter_dead(swap, SWAP_SUCCESS);
1159 swap_set_state(swap, swap->state);
1163 } else if (swap->just_activated) {
1165 /* New swap entry */
1167 switch (swap->state) {
1171 swap_enter_active(swap, SWAP_SUCCESS);
1174 case SWAP_ACTIVATING:
1175 swap_set_state(swap, SWAP_ACTIVATING_DONE);
1179 /* Nothing really changed, but let's
1180 * issue an notification call
1181 * nonetheless, in case somebody is
1182 * waiting for this. */
1183 swap_set_state(swap, swap->state);
1188 /* Reset the flags for later calls */
1189 swap->is_active = swap->just_activated = false;
1195 static Unit *swap_following(Unit *u) {
1196 _cleanup_free_ char *p = NULL;
1198 Swap *other, *first = NULL;
1202 if (streq_ptr(s->what, s->devnode))
1205 /* Make everybody follow the unit that's named after the swap
1206 * device in the kernel */
1208 LIST_FOREACH_AFTER(same_devnode, other, s)
1209 if (streq_ptr(other->what, other->devnode))
1212 LIST_FOREACH_BEFORE(same_devnode, other, s) {
1213 if (streq_ptr(other->what, other->devnode))
1222 static int swap_following_set(Unit *u, Set **_set) {
1223 Swap *s = SWAP(u), *other;
1230 if (LIST_JUST_US(same_devnode, s)) {
1235 set = set_new(NULL, NULL);
1239 LIST_FOREACH_AFTER(same_devnode, other, s) {
1240 r = set_put(set, other);
1245 LIST_FOREACH_BEFORE(same_devnode, other, s) {
1246 r = set_put(set, other);
1259 static void swap_shutdown(Manager *m) {
1262 m->swap_event_source = sd_event_source_unref(m->swap_event_source);
1264 if (m->proc_swaps) {
1265 fclose(m->proc_swaps);
1266 m->proc_swaps = NULL;
1269 hashmap_free(m->swaps_by_devnode);
1270 m->swaps_by_devnode = NULL;
1273 static int swap_enumerate(Manager *m) {
1278 if (!m->proc_swaps) {
1279 m->proc_swaps = fopen("/proc/swaps", "re");
1281 return errno == ENOENT ? 0 : -errno;
1283 r = sd_event_add_io(m->event, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m, &m->swap_event_source);
1287 /* Dispatch this before we dispatch SIGCHLD, so that
1288 * we always get the events from /proc/swaps before
1289 * the SIGCHLD of /sbin/swapon. */
1290 r = sd_event_source_set_priority(m->swap_event_source, -10);
1295 r = swap_load_proc_swaps(m, false);
1306 int swap_process_new_device(Manager *m, struct udev_device *dev) {
1307 struct udev_list_entry *item = NULL, *first = NULL;
1308 _cleanup_free_ char *e = NULL;
1316 dn = udev_device_get_devnode(dev);
1320 e = unit_name_from_path(dn, ".swap");
1324 s = hashmap_get(m->units, e);
1326 r = swap_set_devnode(s, dn);
1328 first = udev_device_get_devlinks_list_entry(dev);
1329 udev_list_entry_foreach(item, first) {
1330 _cleanup_free_ char *n = NULL;
1332 n = unit_name_from_path(udev_list_entry_get_name(item), ".swap");
1336 s = hashmap_get(m->units, n);
1340 q = swap_set_devnode(s, dn);
1349 int swap_process_removed_device(Manager *m, struct udev_device *dev) {
1350 _cleanup_free_ char *e = NULL;
1355 dn = udev_device_get_devnode(dev);
1359 while ((s = hashmap_get(m->swaps_by_devnode, dn))) {
1362 q = swap_set_devnode(s, NULL);
1370 static void swap_reset_failed(Unit *u) {
1375 if (s->state == SWAP_FAILED)
1376 swap_set_state(s, SWAP_DEAD);
1378 s->result = SWAP_SUCCESS;
1381 static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1382 return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error);
1385 static const char* const swap_state_table[_SWAP_STATE_MAX] = {
1386 [SWAP_DEAD] = "dead",
1387 [SWAP_ACTIVATING] = "activating",
1388 [SWAP_ACTIVATING_DONE] = "activating-done",
1389 [SWAP_ACTIVE] = "active",
1390 [SWAP_DEACTIVATING] = "deactivating",
1391 [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm",
1392 [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill",
1393 [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm",
1394 [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill",
1395 [SWAP_FAILED] = "failed"
1398 DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
1400 static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
1401 [SWAP_EXEC_ACTIVATE] = "ExecActivate",
1402 [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
1405 DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
1407 static const char* const swap_result_table[_SWAP_RESULT_MAX] = {
1408 [SWAP_SUCCESS] = "success",
1409 [SWAP_FAILURE_RESOURCES] = "resources",
1410 [SWAP_FAILURE_TIMEOUT] = "timeout",
1411 [SWAP_FAILURE_EXIT_CODE] = "exit-code",
1412 [SWAP_FAILURE_SIGNAL] = "signal",
1413 [SWAP_FAILURE_CORE_DUMP] = "core-dump"
1416 DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult);
1418 const UnitVTable swap_vtable = {
1419 .object_size = sizeof(Swap),
1420 .exec_context_offset = offsetof(Swap, exec_context),
1421 .cgroup_context_offset = offsetof(Swap, cgroup_context),
1422 .kill_context_offset = offsetof(Swap, kill_context),
1428 .private_section = "Swap",
1431 .no_instances = true,
1437 .coldplug = swap_coldplug,
1441 .start = swap_start,
1446 .serialize = swap_serialize,
1447 .deserialize_item = swap_deserialize_item,
1449 .active_state = swap_active_state,
1450 .sub_state_to_string = swap_sub_state_to_string,
1452 .check_gc = swap_check_gc,
1454 .sigchld_event = swap_sigchld_event,
1456 .reset_failed = swap_reset_failed,
1458 .bus_interface = "org.freedesktop.systemd1.Swap",
1459 .bus_vtable = bus_swap_vtable,
1460 .bus_changing_properties = bus_swap_changing_properties,
1461 .bus_set_property = bus_swap_set_property,
1462 .bus_commit_properties = bus_swap_commit_properties,
1464 .following = swap_following,
1465 .following_set = swap_following_set,
1467 .enumerate = swap_enumerate,
1468 .shutdown = swap_shutdown,
1470 .status_message_formats = {
1471 .starting_stopping = {
1472 [0] = "Activating swap %s...",
1473 [1] = "Deactivating swap %s...",
1475 .finished_start_job = {
1476 [JOB_DONE] = "Activated swap %s.",
1477 [JOB_FAILED] = "Failed to activate swap %s.",
1478 [JOB_DEPENDENCY] = "Dependency failed for %s.",
1479 [JOB_TIMEOUT] = "Timed out activating swap %s.",
1481 .finished_stop_job = {
1482 [JOB_DONE] = "Deactivated swap %s.",
1483 [JOB_FAILED] = "Failed deactivating swap %s.",
1484 [JOB_TIMEOUT] = "Timed out deactivating swap %s.",