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,
654 r = unit_watch_pid(UNIT(s), pid);
656 /* FIXME: we need to do something here */
664 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
669 static void swap_enter_dead(Swap *s, SwapResult f) {
672 if (f != SWAP_SUCCESS)
675 exec_runtime_destroy(s->exec_runtime);
676 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
678 swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD);
681 static void swap_enter_active(Swap *s, SwapResult f) {
684 if (f != SWAP_SUCCESS)
687 swap_set_state(s, SWAP_ACTIVE);
690 static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) {
695 if (f != SWAP_SUCCESS)
698 r = unit_kill_context(
701 state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM,
709 r = swap_arm_timer(s);
713 swap_set_state(s, state);
715 swap_enter_dead(s, SWAP_SUCCESS);
720 log_warning_unit(UNIT(s)->id,
721 "%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
723 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
726 static void swap_enter_activating(Swap *s) {
731 s->control_command_id = SWAP_EXEC_ACTIVATE;
732 s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
734 if (s->from_fragment)
735 priority = s->parameters_fragment.priority;
740 char p[DECIMAL_STR_MAX(int)];
742 sprintf(p, "%i", priority);
744 r = exec_command_set(
752 r = exec_command_set(
761 swap_unwatch_control_pid(s);
763 r = swap_spawn(s, s->control_command, &s->control_pid);
767 swap_set_state(s, SWAP_ACTIVATING);
772 log_warning_unit(UNIT(s)->id,
773 "%s failed to run 'swapon' task: %s",
774 UNIT(s)->id, strerror(-r));
775 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
778 static void swap_enter_deactivating(Swap *s) {
783 s->control_command_id = SWAP_EXEC_DEACTIVATE;
784 s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
786 r = exec_command_set(s->control_command,
793 swap_unwatch_control_pid(s);
795 r = swap_spawn(s, s->control_command, &s->control_pid);
799 swap_set_state(s, SWAP_DEACTIVATING);
804 log_warning_unit(UNIT(s)->id,
805 "%s failed to run 'swapoff' task: %s",
806 UNIT(s)->id, strerror(-r));
807 swap_enter_active(s, SWAP_FAILURE_RESOURCES);
810 static int swap_start(Unit *u) {
815 /* We cannot fulfill this request right now, try again later
818 if (s->state == SWAP_DEACTIVATING ||
819 s->state == SWAP_DEACTIVATING_SIGTERM ||
820 s->state == SWAP_DEACTIVATING_SIGKILL ||
821 s->state == SWAP_ACTIVATING_SIGTERM ||
822 s->state == SWAP_ACTIVATING_SIGKILL)
825 if (s->state == SWAP_ACTIVATING)
828 assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED);
830 if (detect_container(NULL) > 0)
833 s->result = SWAP_SUCCESS;
834 swap_enter_activating(s);
838 static int swap_stop(Unit *u) {
843 if (s->state == SWAP_DEACTIVATING ||
844 s->state == SWAP_DEACTIVATING_SIGTERM ||
845 s->state == SWAP_DEACTIVATING_SIGKILL ||
846 s->state == SWAP_ACTIVATING_SIGTERM ||
847 s->state == SWAP_ACTIVATING_SIGKILL)
850 assert(s->state == SWAP_ACTIVATING ||
851 s->state == SWAP_ACTIVATING_DONE ||
852 s->state == SWAP_ACTIVE);
854 if (detect_container(NULL) > 0)
857 swap_enter_deactivating(s);
861 static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
868 unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
869 unit_serialize_item(u, f, "result", swap_result_to_string(s->result));
871 if (s->control_pid > 0)
872 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
874 if (s->control_command_id >= 0)
875 unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id));
880 static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
886 if (streq(key, "state")) {
889 state = swap_state_from_string(value);
891 log_debug_unit(u->id, "Failed to parse state value %s", value);
893 s->deserialized_state = state;
894 } else if (streq(key, "result")) {
897 f = swap_result_from_string(value);
899 log_debug_unit(u->id, "Failed to parse result value %s", value);
900 else if (f != SWAP_SUCCESS)
902 } else if (streq(key, "control-pid")) {
905 if (parse_pid(value, &pid) < 0)
906 log_debug_unit(u->id, "Failed to parse control-pid value %s", value);
908 s->control_pid = pid;
910 } else if (streq(key, "control-command")) {
913 id = swap_exec_command_from_string(value);
915 log_debug_unit(u->id, "Failed to parse exec-command value %s", value);
917 s->control_command_id = id;
918 s->control_command = s->exec_command + id;
921 log_debug_unit(u->id, "Unknown serialization key '%s'", key);
926 _pure_ static UnitActiveState swap_active_state(Unit *u) {
929 return state_translation_table[SWAP(u)->state];
932 _pure_ static const char *swap_sub_state_to_string(Unit *u) {
935 return swap_state_to_string(SWAP(u)->state);
938 _pure_ static bool swap_check_gc(Unit *u) {
943 return s->from_proc_swaps;
946 static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
953 if (pid != s->control_pid)
958 if (is_clean_exit(code, status, NULL))
960 else if (code == CLD_EXITED)
961 f = SWAP_FAILURE_EXIT_CODE;
962 else if (code == CLD_KILLED)
963 f = SWAP_FAILURE_SIGNAL;
964 else if (code == CLD_DUMPED)
965 f = SWAP_FAILURE_CORE_DUMP;
967 assert_not_reached("Unknown code");
969 if (f != SWAP_SUCCESS)
972 if (s->control_command) {
973 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
975 s->control_command = NULL;
976 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
979 log_full_unit(f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
981 "%s swap process exited, code=%s status=%i",
982 u->id, sigchld_code_to_string(code), status);
986 case SWAP_ACTIVATING:
987 case SWAP_ACTIVATING_DONE:
988 case SWAP_ACTIVATING_SIGTERM:
989 case SWAP_ACTIVATING_SIGKILL:
991 if (f == SWAP_SUCCESS)
992 swap_enter_active(s, f);
994 swap_enter_dead(s, f);
997 case SWAP_DEACTIVATING:
998 case SWAP_DEACTIVATING_SIGKILL:
999 case SWAP_DEACTIVATING_SIGTERM:
1001 if (f == SWAP_SUCCESS)
1002 swap_enter_dead(s, f);
1004 swap_enter_dead(s, f);
1008 assert_not_reached("Uh, control process died at wrong time.");
1011 /* Notify clients about changed exit status */
1012 unit_add_to_dbus_queue(u);
1015 static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1016 Swap *s = SWAP(userdata);
1019 assert(s->timer_event_source == source);
1023 case SWAP_ACTIVATING:
1024 case SWAP_ACTIVATING_DONE:
1025 log_warning_unit(UNIT(s)->id, "%s activation timed out. Stopping.", UNIT(s)->id);
1026 swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1029 case SWAP_DEACTIVATING:
1030 log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Stopping.", UNIT(s)->id);
1031 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1034 case SWAP_ACTIVATING_SIGTERM:
1035 if (s->kill_context.send_sigkill) {
1036 log_warning_unit(UNIT(s)->id, "%s activation timed out. Killing.", UNIT(s)->id);
1037 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1039 log_warning_unit(UNIT(s)->id, "%s activation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
1040 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1044 case SWAP_DEACTIVATING_SIGTERM:
1045 if (s->kill_context.send_sigkill) {
1046 log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Killing.", UNIT(s)->id);
1047 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1049 log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
1050 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1054 case SWAP_ACTIVATING_SIGKILL:
1055 case SWAP_DEACTIVATING_SIGKILL:
1056 log_warning_unit(UNIT(s)->id, "%s swap process still around after SIGKILL. Ignoring.", UNIT(s)->id);
1057 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1061 assert_not_reached("Timeout at wrong time.");
1067 static int swap_load_proc_swaps(Manager *m, bool set_flags) {
1073 rewind(m->proc_swaps);
1075 (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
1078 _cleanup_free_ char *dev = NULL, *d = NULL;
1081 k = fscanf(m->proc_swaps,
1082 "%ms " /* device/file */
1083 "%*s " /* type of swap */
1084 "%*s " /* swap size */
1086 "%i\n", /* priority */
1092 log_warning("Failed to parse /proc/swaps:%u", i);
1100 k = swap_process_new_swap(m, d, prio, set_flags);
1108 static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1109 Manager *m = userdata;
1114 assert(revents & EPOLLPRI);
1116 r = swap_load_proc_swaps(m, true);
1118 log_error("Failed to reread /proc/swaps: %s", strerror(-r));
1120 /* Reset flags, just in case, for late calls */
1121 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1122 Swap *swap = SWAP(u);
1124 swap->is_active = swap->just_activated = false;
1130 manager_dispatch_load_queue(m);
1132 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1133 Swap *swap = SWAP(u);
1135 if (!swap->is_active) {
1136 /* This has just been deactivated */
1138 swap_unset_proc_swaps(swap);
1140 switch (swap->state) {
1143 swap_enter_dead(swap, SWAP_SUCCESS);
1148 swap_set_state(swap, swap->state);
1152 } else if (swap->just_activated) {
1154 /* New swap entry */
1156 switch (swap->state) {
1160 swap_enter_active(swap, SWAP_SUCCESS);
1163 case SWAP_ACTIVATING:
1164 swap_set_state(swap, SWAP_ACTIVATING_DONE);
1168 /* Nothing really changed, but let's
1169 * issue an notification call
1170 * nonetheless, in case somebody is
1171 * waiting for this. */
1172 swap_set_state(swap, swap->state);
1177 /* Reset the flags for later calls */
1178 swap->is_active = swap->just_activated = false;
1184 static Unit *swap_following(Unit *u) {
1186 Swap *other, *first = NULL;
1190 if (streq_ptr(s->what, s->devnode))
1193 /* Make everybody follow the unit that's named after the swap
1194 * device in the kernel */
1196 LIST_FOREACH_AFTER(same_devnode, other, s)
1197 if (streq_ptr(other->what, other->devnode))
1200 LIST_FOREACH_BEFORE(same_devnode, other, s) {
1201 if (streq_ptr(other->what, other->devnode))
1210 static int swap_following_set(Unit *u, Set **_set) {
1211 Swap *s = SWAP(u), *other;
1218 if (LIST_JUST_US(same_devnode, s)) {
1223 set = set_new(NULL, NULL);
1227 LIST_FOREACH_AFTER(same_devnode, other, s) {
1228 r = set_put(set, other);
1233 LIST_FOREACH_BEFORE(same_devnode, other, s) {
1234 r = set_put(set, other);
1247 static void swap_shutdown(Manager *m) {
1250 m->swap_event_source = sd_event_source_unref(m->swap_event_source);
1252 if (m->proc_swaps) {
1253 fclose(m->proc_swaps);
1254 m->proc_swaps = NULL;
1257 hashmap_free(m->swaps_by_devnode);
1258 m->swaps_by_devnode = NULL;
1261 static int swap_enumerate(Manager *m) {
1266 if (!m->proc_swaps) {
1267 m->proc_swaps = fopen("/proc/swaps", "re");
1269 return errno == ENOENT ? 0 : -errno;
1271 r = sd_event_add_io(m->event, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m, &m->swap_event_source);
1275 /* Dispatch this before we dispatch SIGCHLD, so that
1276 * we always get the events from /proc/swaps before
1277 * the SIGCHLD of /sbin/swapon. */
1278 r = sd_event_source_set_priority(m->swap_event_source, -10);
1283 r = swap_load_proc_swaps(m, false);
1294 int swap_process_new_device(Manager *m, struct udev_device *dev) {
1295 struct udev_list_entry *item = NULL, *first = NULL;
1296 _cleanup_free_ char *e = NULL;
1304 dn = udev_device_get_devnode(dev);
1308 e = unit_name_from_path(dn, ".swap");
1312 s = hashmap_get(m->units, e);
1314 r = swap_set_devnode(s, dn);
1316 first = udev_device_get_devlinks_list_entry(dev);
1317 udev_list_entry_foreach(item, first) {
1318 _cleanup_free_ char *n = NULL;
1320 n = unit_name_from_path(udev_list_entry_get_name(item), ".swap");
1324 s = hashmap_get(m->units, n);
1328 q = swap_set_devnode(s, dn);
1337 int swap_process_removed_device(Manager *m, struct udev_device *dev) {
1342 dn = udev_device_get_devnode(dev);
1346 while ((s = hashmap_get(m->swaps_by_devnode, dn))) {
1349 q = swap_set_devnode(s, NULL);
1357 static void swap_reset_failed(Unit *u) {
1362 if (s->state == SWAP_FAILED)
1363 swap_set_state(s, SWAP_DEAD);
1365 s->result = SWAP_SUCCESS;
1368 static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1369 return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error);
1372 static const char* const swap_state_table[_SWAP_STATE_MAX] = {
1373 [SWAP_DEAD] = "dead",
1374 [SWAP_ACTIVATING] = "activating",
1375 [SWAP_ACTIVATING_DONE] = "activating-done",
1376 [SWAP_ACTIVE] = "active",
1377 [SWAP_DEACTIVATING] = "deactivating",
1378 [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm",
1379 [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill",
1380 [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm",
1381 [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill",
1382 [SWAP_FAILED] = "failed"
1385 DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
1387 static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
1388 [SWAP_EXEC_ACTIVATE] = "ExecActivate",
1389 [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
1392 DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
1394 static const char* const swap_result_table[_SWAP_RESULT_MAX] = {
1395 [SWAP_SUCCESS] = "success",
1396 [SWAP_FAILURE_RESOURCES] = "resources",
1397 [SWAP_FAILURE_TIMEOUT] = "timeout",
1398 [SWAP_FAILURE_EXIT_CODE] = "exit-code",
1399 [SWAP_FAILURE_SIGNAL] = "signal",
1400 [SWAP_FAILURE_CORE_DUMP] = "core-dump"
1403 DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult);
1405 const UnitVTable swap_vtable = {
1406 .object_size = sizeof(Swap),
1407 .exec_context_offset = offsetof(Swap, exec_context),
1408 .cgroup_context_offset = offsetof(Swap, cgroup_context),
1409 .kill_context_offset = offsetof(Swap, kill_context),
1410 .exec_runtime_offset = offsetof(Swap, exec_runtime),
1416 .private_section = "Swap",
1419 .no_instances = true,
1425 .coldplug = swap_coldplug,
1429 .start = swap_start,
1434 .serialize = swap_serialize,
1435 .deserialize_item = swap_deserialize_item,
1437 .active_state = swap_active_state,
1438 .sub_state_to_string = swap_sub_state_to_string,
1440 .check_gc = swap_check_gc,
1442 .sigchld_event = swap_sigchld_event,
1444 .reset_failed = swap_reset_failed,
1446 .bus_interface = "org.freedesktop.systemd1.Swap",
1447 .bus_vtable = bus_swap_vtable,
1448 .bus_changing_properties = bus_swap_changing_properties,
1449 .bus_set_property = bus_swap_set_property,
1450 .bus_commit_properties = bus_swap_commit_properties,
1452 .following = swap_following,
1453 .following_set = swap_following_set,
1455 .enumerate = swap_enumerate,
1456 .shutdown = swap_shutdown,
1458 .status_message_formats = {
1459 .starting_stopping = {
1460 [0] = "Activating swap %s...",
1461 [1] = "Deactivating swap %s...",
1463 .finished_start_job = {
1464 [JOB_DONE] = "Activated swap %s.",
1465 [JOB_FAILED] = "Failed to activate swap %s.",
1466 [JOB_DEPENDENCY] = "Dependency failed for %s.",
1467 [JOB_TIMEOUT] = "Timed out activating swap %s.",
1469 .finished_stop_job = {
1470 [JOB_DONE] = "Deactivated swap %s.",
1471 [JOB_FAILED] = "Failed deactivating swap %s.",
1472 [JOB_TIMEOUT] = "Timed out deactivating swap %s.",