1 /* SPDX-License-Identifier: LGPL-2.1+ */
10 #include "alloc-util.h"
11 #include "dbus-swap.h"
12 #include "dbus-unit.h"
13 #include "device-private.h"
14 #include "device-util.h"
17 #include "exit-status.h"
19 #include "format-util.h"
20 #include "fstab-util.h"
21 #include "parse-util.h"
22 #include "path-util.h"
23 #include "process-util.h"
24 #include "serialize.h"
26 #include "string-table.h"
27 #include "string-util.h"
29 #include "unit-name.h"
33 static const UnitActiveState state_translation_table
[_SWAP_STATE_MAX
] = {
34 [SWAP_DEAD
] = UNIT_INACTIVE
,
35 [SWAP_ACTIVATING
] = UNIT_ACTIVATING
,
36 [SWAP_ACTIVATING_DONE
] = UNIT_ACTIVE
,
37 [SWAP_ACTIVE
] = UNIT_ACTIVE
,
38 [SWAP_DEACTIVATING
] = UNIT_DEACTIVATING
,
39 [SWAP_DEACTIVATING_SIGTERM
] = UNIT_DEACTIVATING
,
40 [SWAP_DEACTIVATING_SIGKILL
] = UNIT_DEACTIVATING
,
41 [SWAP_FAILED
] = UNIT_FAILED
44 static int swap_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
);
45 static int swap_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
);
47 static bool SWAP_STATE_WITH_PROCESS(SwapState state
) {
52 SWAP_DEACTIVATING_SIGTERM
,
53 SWAP_DEACTIVATING_SIGKILL
);
56 static void swap_unset_proc_swaps(Swap
*s
) {
59 if (!s
->from_proc_swaps
)
62 s
->parameters_proc_swaps
.what
= mfree(s
->parameters_proc_swaps
.what
);
64 s
->from_proc_swaps
= false;
67 static int swap_set_devnode(Swap
*s
, const char *devnode
) {
74 r
= hashmap_ensure_allocated(&UNIT(s
)->manager
->swaps_by_devnode
, &path_hash_ops
);
78 swaps
= UNIT(s
)->manager
->swaps_by_devnode
;
81 first
= hashmap_get(swaps
, s
->devnode
);
83 LIST_REMOVE(same_devnode
, first
, s
);
85 hashmap_replace(swaps
, first
->devnode
, first
);
87 hashmap_remove(swaps
, s
->devnode
);
89 s
->devnode
= mfree(s
->devnode
);
93 s
->devnode
= strdup(devnode
);
97 first
= hashmap_get(swaps
, s
->devnode
);
98 LIST_PREPEND(same_devnode
, first
, s
);
100 return hashmap_replace(swaps
, first
->devnode
, first
);
106 static void swap_init(Unit
*u
) {
110 assert(UNIT(s
)->load_state
== UNIT_STUB
);
112 s
->timeout_usec
= u
->manager
->default_timeout_start_usec
;
114 s
->exec_context
.std_output
= u
->manager
->default_std_output
;
115 s
->exec_context
.std_error
= u
->manager
->default_std_error
;
117 s
->parameters_proc_swaps
.priority
= s
->parameters_fragment
.priority
= -1;
119 s
->control_command_id
= _SWAP_EXEC_COMMAND_INVALID
;
121 u
->ignore_on_isolate
= true;
124 static void swap_unwatch_control_pid(Swap
*s
) {
127 if (s
->control_pid
<= 0)
130 unit_unwatch_pid(UNIT(s
), s
->control_pid
);
134 static void swap_done(Unit
*u
) {
139 swap_unset_proc_swaps(s
);
140 swap_set_devnode(s
, NULL
);
142 s
->what
= mfree(s
->what
);
143 s
->parameters_fragment
.what
= mfree(s
->parameters_fragment
.what
);
144 s
->parameters_fragment
.options
= mfree(s
->parameters_fragment
.options
);
146 s
->exec_runtime
= exec_runtime_unref(s
->exec_runtime
, false);
147 exec_command_done_array(s
->exec_command
, _SWAP_EXEC_COMMAND_MAX
);
148 s
->control_command
= NULL
;
150 dynamic_creds_unref(&s
->dynamic_creds
);
152 swap_unwatch_control_pid(s
);
154 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
157 static int swap_arm_timer(Swap
*s
, usec_t usec
) {
162 if (s
->timer_event_source
) {
163 r
= sd_event_source_set_time(s
->timer_event_source
, usec
);
167 return sd_event_source_set_enabled(s
->timer_event_source
, SD_EVENT_ONESHOT
);
170 if (usec
== USEC_INFINITY
)
173 r
= sd_event_add_time(
174 UNIT(s
)->manager
->event
,
175 &s
->timer_event_source
,
178 swap_dispatch_timer
, s
);
182 (void) sd_event_source_set_description(s
->timer_event_source
, "swap-timer");
187 static int swap_add_device_dependencies(Swap
*s
) {
193 if (!s
->from_fragment
)
196 if (is_device_path(s
->what
))
197 return unit_add_node_dependency(UNIT(s
), s
->what
, MANAGER_IS_SYSTEM(UNIT(s
)->manager
), UNIT_BINDS_TO
, UNIT_DEPENDENCY_FILE
);
199 /* File based swap devices need to be ordered after
200 * systemd-remount-fs.service, since they might need a
201 * writable file system. */
202 return unit_add_dependency_by_name(UNIT(s
), UNIT_AFTER
, SPECIAL_REMOUNT_FS_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
205 static int swap_add_default_dependencies(Swap
*s
) {
210 if (!UNIT(s
)->default_dependencies
)
213 if (!MANAGER_IS_SYSTEM(UNIT(s
)->manager
))
216 if (detect_container() > 0)
219 /* swap units generated for the swap dev links are missing the
220 * ordering dep against the swap target. */
221 r
= unit_add_dependency_by_name(UNIT(s
), UNIT_BEFORE
, SPECIAL_SWAP_TARGET
, true, UNIT_DEPENDENCY_DEFAULT
);
225 return unit_add_two_dependencies_by_name(UNIT(s
), UNIT_BEFORE
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, true, UNIT_DEPENDENCY_DEFAULT
);
228 static int swap_verify(Swap
*s
) {
229 _cleanup_free_
char *e
= NULL
;
232 if (UNIT(s
)->load_state
!= UNIT_LOADED
)
235 r
= unit_name_from_path(s
->what
, ".swap", &e
);
237 return log_unit_error_errno(UNIT(s
), r
, "Failed to generate unit name from path: %m");
239 if (!unit_has_name(UNIT(s
), e
)) {
240 log_unit_error(UNIT(s
), "Value of What= and unit name do not match, not loading.");
244 if (s
->exec_context
.pam_name
&& s
->kill_context
.kill_mode
!= KILL_CONTROL_GROUP
) {
245 log_unit_error(UNIT(s
), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load.");
252 static int swap_load_devnode(Swap
*s
) {
253 _cleanup_(sd_device_unrefp
) sd_device
*d
= NULL
;
260 if (stat(s
->what
, &st
) < 0 || !S_ISBLK(st
.st_mode
))
263 r
= device_new_from_stat_rdev(&d
, &st
);
265 log_unit_full(UNIT(s
), r
== -ENOENT
? LOG_DEBUG
: LOG_WARNING
, r
,
266 "Failed to allocate device for swap %s: %m", s
->what
);
270 if (sd_device_get_devname(d
, &p
) < 0)
273 return swap_set_devnode(s
, p
);
276 static int swap_add_extras(Swap
*s
) {
281 if (UNIT(s
)->fragment_path
)
282 s
->from_fragment
= true;
285 if (s
->parameters_fragment
.what
)
286 s
->what
= strdup(s
->parameters_fragment
.what
);
287 else if (s
->parameters_proc_swaps
.what
)
288 s
->what
= strdup(s
->parameters_proc_swaps
.what
);
290 r
= unit_name_to_path(UNIT(s
)->id
, &s
->what
);
299 path_simplify(s
->what
, false);
301 if (!UNIT(s
)->description
) {
302 r
= unit_set_description(UNIT(s
), s
->what
);
307 r
= unit_require_mounts_for(UNIT(s
), s
->what
, UNIT_DEPENDENCY_IMPLICIT
);
311 r
= swap_add_device_dependencies(s
);
315 r
= swap_load_devnode(s
);
319 r
= unit_patch_contexts(UNIT(s
));
323 r
= unit_add_exec_dependencies(UNIT(s
), &s
->exec_context
);
327 r
= unit_set_default_slice(UNIT(s
));
331 r
= swap_add_default_dependencies(s
);
338 static int swap_load(Unit
*u
) {
343 assert(u
->load_state
== UNIT_STUB
);
345 /* Load a .swap file */
346 if (SWAP(u
)->from_proc_swaps
)
347 r
= unit_load_fragment_and_dropin_optional(u
);
349 r
= unit_load_fragment_and_dropin(u
);
351 /* Add in some extras, and do so either when we successfully loaded something or when /proc/swaps is already
353 if (u
->load_state
== UNIT_LOADED
|| s
->from_proc_swaps
)
354 q
= swap_add_extras(s
);
363 return swap_verify(s
);
366 static int swap_setup_unit(
369 const char *what_proc_swaps
,
373 _cleanup_free_
char *e
= NULL
;
381 assert(what_proc_swaps
);
383 r
= unit_name_from_path(what
, ".swap", &e
);
385 return log_unit_error_errno(u
, r
, "Failed to generate unit name from path: %m");
387 u
= manager_get_unit(m
, e
);
389 SWAP(u
)->from_proc_swaps
&&
390 !path_equal(SWAP(u
)->parameters_proc_swaps
.what
, what_proc_swaps
))
391 return log_error_errno(SYNTHETIC_ERRNO(EEXIST
),
392 "Swap %s appeared twice with different device paths %s and %s",
393 e
, SWAP(u
)->parameters_proc_swaps
.what
, what_proc_swaps
);
398 r
= unit_new_for_name(m
, sizeof(Swap
), e
, &u
);
402 SWAP(u
)->what
= strdup(what
);
403 if (!SWAP(u
)->what
) {
408 unit_add_to_load_queue(u
);
412 p
= &SWAP(u
)->parameters_proc_swaps
;
415 p
->what
= strdup(what_proc_swaps
);
422 /* The unit is definitely around now, mark it as loaded if it was previously referenced but could not be
423 * loaded. After all we can load it now, from the data in /proc/swaps. */
424 if (IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_BAD_SETTING
, UNIT_ERROR
)) {
425 u
->load_state
= UNIT_LOADED
;
430 SWAP(u
)->is_active
= true;
431 SWAP(u
)->just_activated
= !SWAP(u
)->from_proc_swaps
;
434 SWAP(u
)->from_proc_swaps
= true;
436 p
->priority
= priority
;
438 unit_add_to_dbus_queue(u
);
442 log_unit_warning_errno(u
, r
, "Failed to load swap unit: %m");
450 static int swap_process_new(Manager
*m
, const char *device
, int prio
, bool set_flags
) {
451 _cleanup_(sd_device_unrefp
) sd_device
*d
= NULL
;
452 const char *dn
, *devlink
;
453 struct stat st
, st_link
;
458 r
= swap_setup_unit(m
, device
, device
, prio
, set_flags
);
462 /* If this is a block device, then let's add duplicates for
463 * all other names of this block device */
464 if (stat(device
, &st
) < 0 || !S_ISBLK(st
.st_mode
))
467 r
= device_new_from_stat_rdev(&d
, &st
);
469 log_full_errno(r
== -ENOENT
? LOG_DEBUG
: LOG_WARNING
, r
,
470 "Failed to allocate device for swap %s: %m", device
);
474 /* Add the main device node */
475 if (sd_device_get_devname(d
, &dn
) >= 0 && !streq(dn
, device
))
476 swap_setup_unit(m
, dn
, device
, prio
, set_flags
);
478 /* Add additional units for all symlinks */
479 FOREACH_DEVICE_DEVLINK(d
, devlink
) {
481 /* Don't bother with the /dev/block links */
482 if (streq(devlink
, device
))
485 if (path_startswith(devlink
, "/dev/block/"))
488 if (stat(devlink
, &st_link
) >= 0 &&
489 (!S_ISBLK(st_link
.st_mode
) ||
490 st_link
.st_rdev
!= st
.st_rdev
))
493 swap_setup_unit(m
, devlink
, device
, prio
, set_flags
);
499 static void swap_set_state(Swap
*s
, SwapState state
) {
505 if (s
->state
!= state
)
506 bus_unit_send_pending_change_signal(UNIT(s
), false);
508 old_state
= s
->state
;
511 if (!SWAP_STATE_WITH_PROCESS(state
)) {
512 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
513 swap_unwatch_control_pid(s
);
514 s
->control_command
= NULL
;
515 s
->control_command_id
= _SWAP_EXEC_COMMAND_INVALID
;
518 if (state
!= old_state
)
519 log_unit_debug(UNIT(s
), "Changed %s -> %s", swap_state_to_string(old_state
), swap_state_to_string(state
));
521 unit_notify(UNIT(s
), state_translation_table
[old_state
], state_translation_table
[state
], 0);
523 /* If there other units for the same device node have a job
524 queued it might be worth checking again if it is runnable
525 now. This is necessary, since swap_start() refuses
526 operation with EAGAIN if there's already another job for
527 the same device node queued. */
528 LIST_FOREACH_OTHERS(same_devnode
, other
, s
)
529 if (UNIT(other
)->job
)
530 job_add_to_run_queue(UNIT(other
)->job
);
533 static int swap_coldplug(Unit
*u
) {
535 SwapState new_state
= SWAP_DEAD
;
539 assert(s
->state
== SWAP_DEAD
);
541 if (s
->deserialized_state
!= s
->state
)
542 new_state
= s
->deserialized_state
;
543 else if (s
->from_proc_swaps
)
544 new_state
= SWAP_ACTIVE
;
546 if (new_state
== s
->state
)
549 if (s
->control_pid
> 0 &&
550 pid_is_unwaited(s
->control_pid
) &&
551 SWAP_STATE_WITH_PROCESS(new_state
)) {
553 r
= unit_watch_pid(UNIT(s
), s
->control_pid
);
557 r
= swap_arm_timer(s
, usec_add(u
->state_change_timestamp
.monotonic
, s
->timeout_usec
));
562 if (!IN_SET(new_state
, SWAP_DEAD
, SWAP_FAILED
)) {
563 (void) unit_setup_dynamic_creds(u
);
564 (void) unit_setup_exec_runtime(u
);
567 swap_set_state(s
, new_state
);
571 static void swap_dump(Unit
*u
, FILE *f
, const char *prefix
) {
572 char buf
[FORMAT_TIMESPAN_MAX
];
579 if (s
->from_proc_swaps
)
580 p
= &s
->parameters_proc_swaps
;
581 else if (s
->from_fragment
)
582 p
= &s
->parameters_fragment
;
590 "%sFrom /proc/swaps: %s\n"
591 "%sFrom fragment: %s\n",
592 prefix
, swap_state_to_string(s
->state
),
593 prefix
, swap_result_to_string(s
->result
),
595 prefix
, yes_no(s
->from_proc_swaps
),
596 prefix
, yes_no(s
->from_fragment
));
599 fprintf(f
, "%sDevice Node: %s\n", prefix
, s
->devnode
);
606 prefix
, strempty(p
->options
));
609 "%sTimeoutSec: %s\n",
610 prefix
, format_timespan(buf
, sizeof(buf
), s
->timeout_usec
, USEC_PER_SEC
));
612 if (s
->control_pid
> 0)
614 "%sControl PID: "PID_FMT
"\n",
615 prefix
, s
->control_pid
);
617 exec_context_dump(&s
->exec_context
, f
, prefix
);
618 kill_context_dump(&s
->kill_context
, f
, prefix
);
619 cgroup_context_dump(&s
->cgroup_context
, f
, prefix
);
622 static int swap_spawn(Swap
*s
, ExecCommand
*c
, pid_t
*_pid
) {
624 _cleanup_(exec_params_clear
) ExecParameters exec_params
= {
625 .flags
= EXEC_APPLY_SANDBOXING
|EXEC_APPLY_CHROOT
|EXEC_APPLY_TTY_STDIN
,
638 r
= unit_prepare_exec(UNIT(s
));
642 r
= swap_arm_timer(s
, usec_add(now(CLOCK_MONOTONIC
), s
->timeout_usec
));
646 r
= unit_set_exec_params(UNIT(s
), &exec_params
);
650 r
= exec_spawn(UNIT(s
),
660 r
= unit_watch_pid(UNIT(s
), pid
);
662 /* FIXME: we need to do something here */
670 s
->timer_event_source
= sd_event_source_unref(s
->timer_event_source
);
675 static void swap_enter_dead(Swap
*s
, SwapResult f
) {
678 if (s
->result
== SWAP_SUCCESS
)
681 unit_log_result(UNIT(s
), s
->result
== SWAP_SUCCESS
, swap_result_to_string(s
->result
));
682 swap_set_state(s
, s
->result
!= SWAP_SUCCESS
? SWAP_FAILED
: SWAP_DEAD
);
684 s
->exec_runtime
= exec_runtime_unref(s
->exec_runtime
, true);
686 exec_context_destroy_runtime_directory(&s
->exec_context
, UNIT(s
)->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
688 unit_unref_uid_gid(UNIT(s
), true);
690 dynamic_creds_destroy(&s
->dynamic_creds
);
693 static void swap_enter_active(Swap
*s
, SwapResult f
) {
696 if (s
->result
== SWAP_SUCCESS
)
699 swap_set_state(s
, SWAP_ACTIVE
);
702 static void swap_enter_dead_or_active(Swap
*s
, SwapResult f
) {
705 if (s
->from_proc_swaps
)
706 swap_enter_active(s
, f
);
708 swap_enter_dead(s
, f
);
711 static void swap_enter_signal(Swap
*s
, SwapState state
, SwapResult f
) {
717 if (s
->result
== SWAP_SUCCESS
)
720 if (state
== SWAP_DEACTIVATING_SIGTERM
)
721 kop
= KILL_TERMINATE
;
725 r
= unit_kill_context(UNIT(s
), &s
->kill_context
, kop
, -1, s
->control_pid
, false);
730 r
= swap_arm_timer(s
, usec_add(now(CLOCK_MONOTONIC
), s
->timeout_usec
));
734 swap_set_state(s
, state
);
735 } else if (state
== SWAP_DEACTIVATING_SIGTERM
&& s
->kill_context
.send_sigkill
)
736 swap_enter_signal(s
, SWAP_DEACTIVATING_SIGKILL
, SWAP_SUCCESS
);
738 swap_enter_dead_or_active(s
, SWAP_SUCCESS
);
743 log_unit_warning_errno(UNIT(s
), r
, "Failed to kill processes: %m");
744 swap_enter_dead_or_active(s
, SWAP_FAILURE_RESOURCES
);
747 static void swap_enter_activating(Swap
*s
) {
748 _cleanup_free_
char *opts
= NULL
;
753 unit_warn_leftover_processes(UNIT(s
));
755 s
->control_command_id
= SWAP_EXEC_ACTIVATE
;
756 s
->control_command
= s
->exec_command
+ SWAP_EXEC_ACTIVATE
;
758 if (s
->from_fragment
) {
761 r
= fstab_find_pri(s
->parameters_fragment
.options
, &priority
);
763 log_warning_errno(r
, "Failed to parse swap priority \"%s\", ignoring: %m", s
->parameters_fragment
.options
);
764 else if (r
== 1 && s
->parameters_fragment
.priority
>= 0)
765 log_warning("Duplicate swap priority configuration by Priority and Options fields.");
767 if (r
<= 0 && s
->parameters_fragment
.priority
>= 0) {
768 if (s
->parameters_fragment
.options
)
769 r
= asprintf(&opts
, "%s,pri=%i", s
->parameters_fragment
.options
, s
->parameters_fragment
.priority
);
771 r
= asprintf(&opts
, "pri=%i", s
->parameters_fragment
.priority
);
777 r
= exec_command_set(s
->control_command
, "/sbin/swapon", NULL
);
781 if (s
->parameters_fragment
.options
|| opts
) {
782 r
= exec_command_append(s
->control_command
, "-o",
783 opts
? : s
->parameters_fragment
.options
, NULL
);
788 r
= exec_command_append(s
->control_command
, s
->what
, NULL
);
792 swap_unwatch_control_pid(s
);
794 r
= swap_spawn(s
, s
->control_command
, &s
->control_pid
);
798 swap_set_state(s
, SWAP_ACTIVATING
);
803 log_unit_warning_errno(UNIT(s
), r
, "Failed to run 'swapon' task: %m");
804 swap_enter_dead_or_active(s
, SWAP_FAILURE_RESOURCES
);
807 static void swap_enter_deactivating(Swap
*s
) {
812 s
->control_command_id
= SWAP_EXEC_DEACTIVATE
;
813 s
->control_command
= s
->exec_command
+ SWAP_EXEC_DEACTIVATE
;
815 r
= exec_command_set(s
->control_command
,
822 swap_unwatch_control_pid(s
);
824 r
= swap_spawn(s
, s
->control_command
, &s
->control_pid
);
828 swap_set_state(s
, SWAP_DEACTIVATING
);
833 log_unit_warning_errno(UNIT(s
), r
, "Failed to run 'swapoff' task: %m");
834 swap_enter_dead_or_active(s
, SWAP_FAILURE_RESOURCES
);
837 static void swap_cycle_clear(Swap
*s
) {
840 s
->result
= SWAP_SUCCESS
;
841 exec_command_reset_status_array(s
->exec_command
, _SWAP_EXEC_COMMAND_MAX
);
842 UNIT(s
)->reset_accounting
= true;
845 static int swap_start(Unit
*u
) {
846 Swap
*s
= SWAP(u
), *other
;
851 /* We cannot fulfill this request right now, try again later please! */
854 SWAP_DEACTIVATING_SIGTERM
,
855 SWAP_DEACTIVATING_SIGKILL
))
859 if (s
->state
== SWAP_ACTIVATING
)
862 assert(IN_SET(s
->state
, SWAP_DEAD
, SWAP_FAILED
));
864 if (detect_container() > 0)
867 /* If there's a job for another swap unit for the same node
868 * running, then let's not dispatch this one for now, and wait
869 * until that other job has finished. */
870 LIST_FOREACH_OTHERS(same_devnode
, other
, s
)
871 if (UNIT(other
)->job
&& UNIT(other
)->job
->state
== JOB_RUNNING
)
874 r
= unit_start_limit_test(u
);
876 swap_enter_dead(s
, SWAP_FAILURE_START_LIMIT_HIT
);
880 r
= unit_acquire_invocation_id(u
);
885 swap_enter_activating(s
);
889 static int swap_stop(Unit
*u
) {
896 case SWAP_DEACTIVATING
:
897 case SWAP_DEACTIVATING_SIGTERM
:
898 case SWAP_DEACTIVATING_SIGKILL
:
902 case SWAP_ACTIVATING
:
903 case SWAP_ACTIVATING_DONE
:
904 /* There's a control process pending, directly enter kill mode */
905 swap_enter_signal(s
, SWAP_DEACTIVATING_SIGTERM
, SWAP_SUCCESS
);
909 if (detect_container() > 0)
912 swap_enter_deactivating(s
);
916 assert_not_reached("Unexpected state.");
920 static int swap_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
927 (void) serialize_item(f
, "state", swap_state_to_string(s
->state
));
928 (void) serialize_item(f
, "result", swap_result_to_string(s
->result
));
930 if (s
->control_pid
> 0)
931 (void) serialize_item_format(f
, "control-pid", PID_FMT
, s
->control_pid
);
933 if (s
->control_command_id
>= 0)
934 (void) serialize_item(f
, "control-command", swap_exec_command_to_string(s
->control_command_id
));
939 static int swap_deserialize_item(Unit
*u
, const char *key
, const char *value
, FDSet
*fds
) {
945 if (streq(key
, "state")) {
948 state
= swap_state_from_string(value
);
950 log_unit_debug(u
, "Failed to parse state value: %s", value
);
952 s
->deserialized_state
= state
;
953 } else if (streq(key
, "result")) {
956 f
= swap_result_from_string(value
);
958 log_unit_debug(u
, "Failed to parse result value: %s", value
);
959 else if (f
!= SWAP_SUCCESS
)
961 } else if (streq(key
, "control-pid")) {
964 if (parse_pid(value
, &pid
) < 0)
965 log_unit_debug(u
, "Failed to parse control-pid value: %s", value
);
967 s
->control_pid
= pid
;
969 } else if (streq(key
, "control-command")) {
972 id
= swap_exec_command_from_string(value
);
974 log_unit_debug(u
, "Failed to parse exec-command value: %s", value
);
976 s
->control_command_id
= id
;
977 s
->control_command
= s
->exec_command
+ id
;
980 log_unit_debug(u
, "Unknown serialization key: %s", key
);
985 _pure_
static UnitActiveState
swap_active_state(Unit
*u
) {
988 return state_translation_table
[SWAP(u
)->state
];
991 _pure_
static const char *swap_sub_state_to_string(Unit
*u
) {
994 return swap_state_to_string(SWAP(u
)->state
);
997 _pure_
static bool swap_may_gc(Unit
*u
) {
1002 if (s
->from_proc_swaps
)
1008 static void swap_sigchld_event(Unit
*u
, pid_t pid
, int code
, int status
) {
1015 if (pid
!= s
->control_pid
)
1020 if (is_clean_exit(code
, status
, EXIT_CLEAN_COMMAND
, NULL
))
1022 else if (code
== CLD_EXITED
)
1023 f
= SWAP_FAILURE_EXIT_CODE
;
1024 else if (code
== CLD_KILLED
)
1025 f
= SWAP_FAILURE_SIGNAL
;
1026 else if (code
== CLD_DUMPED
)
1027 f
= SWAP_FAILURE_CORE_DUMP
;
1029 assert_not_reached("Unknown code");
1031 if (s
->result
== SWAP_SUCCESS
)
1034 if (s
->control_command
) {
1035 exec_status_exit(&s
->control_command
->exec_status
, &s
->exec_context
, pid
, code
, status
);
1037 s
->control_command
= NULL
;
1038 s
->control_command_id
= _SWAP_EXEC_COMMAND_INVALID
;
1041 unit_log_process_exit(
1042 u
, f
== SWAP_SUCCESS
? LOG_DEBUG
: LOG_NOTICE
,
1044 swap_exec_command_to_string(s
->control_command_id
),
1049 case SWAP_ACTIVATING
:
1050 case SWAP_ACTIVATING_DONE
:
1052 if (f
== SWAP_SUCCESS
|| s
->from_proc_swaps
)
1053 swap_enter_active(s
, f
);
1055 swap_enter_dead(s
, f
);
1058 case SWAP_DEACTIVATING
:
1059 case SWAP_DEACTIVATING_SIGKILL
:
1060 case SWAP_DEACTIVATING_SIGTERM
:
1062 swap_enter_dead_or_active(s
, f
);
1066 assert_not_reached("Uh, control process died at wrong time.");
1069 /* Notify clients about changed exit status */
1070 unit_add_to_dbus_queue(u
);
1073 static int swap_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
) {
1074 Swap
*s
= SWAP(userdata
);
1077 assert(s
->timer_event_source
== source
);
1081 case SWAP_ACTIVATING
:
1082 case SWAP_ACTIVATING_DONE
:
1083 log_unit_warning(UNIT(s
), "Activation timed out. Stopping.");
1084 swap_enter_signal(s
, SWAP_DEACTIVATING_SIGTERM
, SWAP_FAILURE_TIMEOUT
);
1087 case SWAP_DEACTIVATING
:
1088 log_unit_warning(UNIT(s
), "Deactivation timed out. Stopping.");
1089 swap_enter_signal(s
, SWAP_DEACTIVATING_SIGTERM
, SWAP_FAILURE_TIMEOUT
);
1092 case SWAP_DEACTIVATING_SIGTERM
:
1093 if (s
->kill_context
.send_sigkill
) {
1094 log_unit_warning(UNIT(s
), "Swap process timed out. Killing.");
1095 swap_enter_signal(s
, SWAP_DEACTIVATING_SIGKILL
, SWAP_FAILURE_TIMEOUT
);
1097 log_unit_warning(UNIT(s
), "Swap process timed out. Skipping SIGKILL. Ignoring.");
1098 swap_enter_dead_or_active(s
, SWAP_FAILURE_TIMEOUT
);
1102 case SWAP_DEACTIVATING_SIGKILL
:
1103 log_unit_warning(UNIT(s
), "Swap process still around after SIGKILL. Ignoring.");
1104 swap_enter_dead_or_active(s
, SWAP_FAILURE_TIMEOUT
);
1108 assert_not_reached("Timeout at wrong time.");
1114 static int swap_load_proc_swaps(Manager
*m
, bool set_flags
) {
1119 rewind(m
->proc_swaps
);
1121 (void) fscanf(m
->proc_swaps
, "%*s %*s %*s %*s %*s\n");
1124 _cleanup_free_
char *dev
= NULL
, *d
= NULL
;
1127 k
= fscanf(m
->proc_swaps
,
1128 "%ms " /* device/file */
1129 "%*s " /* type of swap */
1130 "%*s " /* swap size */
1132 "%i\n", /* priority */
1138 log_warning("Failed to parse /proc/swaps:%u.", i
);
1142 if (cunescape(dev
, UNESCAPE_RELAX
, &d
) < 0)
1145 device_found_node(m
, d
, DEVICE_FOUND_SWAP
, DEVICE_FOUND_SWAP
);
1147 (void) swap_process_new(m
, d
, prio
, set_flags
);
1153 static int swap_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
1154 Manager
*m
= userdata
;
1159 assert(revents
& EPOLLPRI
);
1161 r
= swap_load_proc_swaps(m
, true);
1163 log_error_errno(r
, "Failed to reread /proc/swaps: %m");
1165 /* Reset flags, just in case, for late calls */
1166 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_SWAP
]) {
1167 Swap
*swap
= SWAP(u
);
1169 swap
->is_active
= swap
->just_activated
= false;
1175 manager_dispatch_load_queue(m
);
1177 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_SWAP
]) {
1178 Swap
*swap
= SWAP(u
);
1180 if (!swap
->is_active
) {
1182 swap_unset_proc_swaps(swap
);
1184 switch (swap
->state
) {
1187 /* This has just been deactivated */
1188 swap_enter_dead(swap
, SWAP_SUCCESS
);
1193 swap_set_state(swap
, swap
->state
);
1198 device_found_node(m
, swap
->what
, 0, DEVICE_FOUND_SWAP
);
1200 } else if (swap
->just_activated
) {
1202 /* New swap entry */
1204 switch (swap
->state
) {
1208 (void) unit_acquire_invocation_id(u
);
1209 swap_cycle_clear(swap
);
1210 swap_enter_active(swap
, SWAP_SUCCESS
);
1213 case SWAP_ACTIVATING
:
1214 swap_set_state(swap
, SWAP_ACTIVATING_DONE
);
1218 /* Nothing really changed, but let's
1219 * issue an notification call
1220 * nonetheless, in case somebody is
1221 * waiting for this. */
1222 swap_set_state(swap
, swap
->state
);
1227 /* Reset the flags for later calls */
1228 swap
->is_active
= swap
->just_activated
= false;
1234 static Unit
*swap_following(Unit
*u
) {
1236 Swap
*other
, *first
= NULL
;
1240 /* If the user configured the swap through /etc/fstab or
1241 * a device unit, follow that. */
1243 if (s
->from_fragment
)
1246 LIST_FOREACH_OTHERS(same_devnode
, other
, s
)
1247 if (other
->from_fragment
)
1250 /* Otherwise, make everybody follow the unit that's named after
1251 * the swap device in the kernel */
1253 if (streq_ptr(s
->what
, s
->devnode
))
1256 LIST_FOREACH_AFTER(same_devnode
, other
, s
)
1257 if (streq_ptr(other
->what
, other
->devnode
))
1260 LIST_FOREACH_BEFORE(same_devnode
, other
, s
) {
1261 if (streq_ptr(other
->what
, other
->devnode
))
1267 /* Fall back to the first on the list */
1271 static int swap_following_set(Unit
*u
, Set
**_set
) {
1272 Swap
*s
= SWAP(u
), *other
;
1273 _cleanup_set_free_ Set
*set
= NULL
;
1279 if (LIST_JUST_US(same_devnode
, s
)) {
1284 set
= set_new(NULL
);
1288 LIST_FOREACH_OTHERS(same_devnode
, other
, s
) {
1289 r
= set_put(set
, other
);
1294 *_set
= TAKE_PTR(set
);
1298 static void swap_shutdown(Manager
*m
) {
1301 m
->swap_event_source
= sd_event_source_unref(m
->swap_event_source
);
1302 m
->proc_swaps
= safe_fclose(m
->proc_swaps
);
1303 m
->swaps_by_devnode
= hashmap_free(m
->swaps_by_devnode
);
1306 static void swap_enumerate(Manager
*m
) {
1311 if (!m
->proc_swaps
) {
1312 m
->proc_swaps
= fopen("/proc/swaps", "re");
1313 if (!m
->proc_swaps
) {
1314 if (errno
== ENOENT
)
1315 log_debug_errno(errno
, "Not swap enabled, skipping enumeration.");
1317 log_warning_errno(errno
, "Failed to open /proc/swaps, ignoring: %m");
1322 r
= sd_event_add_io(m
->event
, &m
->swap_event_source
, fileno(m
->proc_swaps
), EPOLLPRI
, swap_dispatch_io
, m
);
1324 log_error_errno(r
, "Failed to watch /proc/swaps: %m");
1328 /* Dispatch this before we dispatch SIGCHLD, so that
1329 * we always get the events from /proc/swaps before
1330 * the SIGCHLD of /sbin/swapon. */
1331 r
= sd_event_source_set_priority(m
->swap_event_source
, SD_EVENT_PRIORITY_NORMAL
-10);
1333 log_error_errno(r
, "Failed to change /proc/swaps priority: %m");
1337 (void) sd_event_source_set_description(m
->swap_event_source
, "swap-proc");
1340 r
= swap_load_proc_swaps(m
, false);
1350 int swap_process_device_new(Manager
*m
, sd_device
*dev
) {
1351 _cleanup_free_
char *e
= NULL
;
1352 const char *dn
, *devlink
;
1359 r
= sd_device_get_devname(dev
, &dn
);
1363 r
= unit_name_from_path(dn
, ".swap", &e
);
1367 u
= manager_get_unit(m
, e
);
1369 r
= swap_set_devnode(SWAP(u
), dn
);
1371 FOREACH_DEVICE_DEVLINK(dev
, devlink
) {
1372 _cleanup_free_
char *n
= NULL
;
1375 q
= unit_name_from_path(devlink
, ".swap", &n
);
1379 u
= manager_get_unit(m
, n
);
1381 q
= swap_set_devnode(SWAP(u
), dn
);
1390 int swap_process_device_remove(Manager
*m
, sd_device
*dev
) {
1395 r
= sd_device_get_devname(dev
, &dn
);
1399 while ((s
= hashmap_get(m
->swaps_by_devnode
, dn
))) {
1402 q
= swap_set_devnode(s
, NULL
);
1410 static void swap_reset_failed(Unit
*u
) {
1415 if (s
->state
== SWAP_FAILED
)
1416 swap_set_state(s
, SWAP_DEAD
);
1418 s
->result
= SWAP_SUCCESS
;
1421 static int swap_kill(Unit
*u
, KillWho who
, int signo
, sd_bus_error
*error
) {
1422 return unit_kill_common(u
, who
, signo
, -1, SWAP(u
)->control_pid
, error
);
1425 static int swap_get_timeout(Unit
*u
, usec_t
*timeout
) {
1430 if (!s
->timer_event_source
)
1433 r
= sd_event_source_get_time(s
->timer_event_source
, &t
);
1436 if (t
== USEC_INFINITY
)
1443 static bool swap_supported(void) {
1444 static int supported
= -1;
1446 /* If swap support is not available in the kernel, or we are
1447 * running in a container we don't support swap units, and any
1448 * attempts to starting one should fail immediately. */
1452 access("/proc/swaps", F_OK
) >= 0 &&
1453 detect_container() <= 0;
1458 static int swap_control_pid(Unit
*u
) {
1463 return s
->control_pid
;
1466 static const char* const swap_exec_command_table
[_SWAP_EXEC_COMMAND_MAX
] = {
1467 [SWAP_EXEC_ACTIVATE
] = "ExecActivate",
1468 [SWAP_EXEC_DEACTIVATE
] = "ExecDeactivate",
1471 DEFINE_STRING_TABLE_LOOKUP(swap_exec_command
, SwapExecCommand
);
1473 static const char* const swap_result_table
[_SWAP_RESULT_MAX
] = {
1474 [SWAP_SUCCESS
] = "success",
1475 [SWAP_FAILURE_RESOURCES
] = "resources",
1476 [SWAP_FAILURE_TIMEOUT
] = "timeout",
1477 [SWAP_FAILURE_EXIT_CODE
] = "exit-code",
1478 [SWAP_FAILURE_SIGNAL
] = "signal",
1479 [SWAP_FAILURE_CORE_DUMP
] = "core-dump",
1480 [SWAP_FAILURE_START_LIMIT_HIT
] = "start-limit-hit",
1483 DEFINE_STRING_TABLE_LOOKUP(swap_result
, SwapResult
);
1485 const UnitVTable swap_vtable
= {
1486 .object_size
= sizeof(Swap
),
1487 .exec_context_offset
= offsetof(Swap
, exec_context
),
1488 .cgroup_context_offset
= offsetof(Swap
, cgroup_context
),
1489 .kill_context_offset
= offsetof(Swap
, kill_context
),
1490 .exec_runtime_offset
= offsetof(Swap
, exec_runtime
),
1491 .dynamic_creds_offset
= offsetof(Swap
, dynamic_creds
),
1497 .private_section
= "Swap",
1503 .coldplug
= swap_coldplug
,
1507 .start
= swap_start
,
1512 .get_timeout
= swap_get_timeout
,
1514 .serialize
= swap_serialize
,
1515 .deserialize_item
= swap_deserialize_item
,
1517 .active_state
= swap_active_state
,
1518 .sub_state_to_string
= swap_sub_state_to_string
,
1520 .may_gc
= swap_may_gc
,
1522 .sigchld_event
= swap_sigchld_event
,
1524 .reset_failed
= swap_reset_failed
,
1526 .control_pid
= swap_control_pid
,
1528 .bus_vtable
= bus_swap_vtable
,
1529 .bus_set_property
= bus_swap_set_property
,
1530 .bus_commit_properties
= bus_swap_commit_properties
,
1532 .following
= swap_following
,
1533 .following_set
= swap_following_set
,
1535 .enumerate
= swap_enumerate
,
1536 .shutdown
= swap_shutdown
,
1537 .supported
= swap_supported
,
1539 .status_message_formats
= {
1540 .starting_stopping
= {
1541 [0] = "Activating swap %s...",
1542 [1] = "Deactivating swap %s...",
1544 .finished_start_job
= {
1545 [JOB_DONE
] = "Activated swap %s.",
1546 [JOB_FAILED
] = "Failed to activate swap %s.",
1547 [JOB_TIMEOUT
] = "Timed out activating swap %s.",
1549 .finished_stop_job
= {
1550 [JOB_DONE
] = "Deactivated swap %s.",
1551 [JOB_FAILED
] = "Failed deactivating swap %s.",
1552 [JOB_TIMEOUT
] = "Timed out deactivating swap %s.",