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swap.c
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swap.c
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <sys/epoll.h>
#include <sys/stat.h>
#include <unistd.h>
#include "sd-device.h"
#include "alloc-util.h"
#include "dbus-swap.h"
#include "dbus-unit.h"
#include "device-util.h"
#include "device.h"
#include "escape.h"
#include "exit-status.h"
#include "fd-util.h"
#include "format-util.h"
#include "fstab-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "process-util.h"
#include "serialize.h"
#include "special.h"
#include "string-table.h"
#include "string-util.h"
#include "swap.h"
#include "unit-name.h"
#include "unit.h"
#include "virt.h"
static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
[SWAP_DEAD] = UNIT_INACTIVE,
[SWAP_ACTIVATING] = UNIT_ACTIVATING,
[SWAP_ACTIVATING_DONE] = UNIT_ACTIVE,
[SWAP_ACTIVE] = UNIT_ACTIVE,
[SWAP_DEACTIVATING] = UNIT_DEACTIVATING,
[SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
[SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
[SWAP_FAILED] = UNIT_FAILED,
[SWAP_CLEANING] = UNIT_MAINTENANCE,
};
static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
static int swap_process_proc_swaps(Manager *m);
static bool SWAP_STATE_WITH_PROCESS(SwapState state) {
return IN_SET(state,
SWAP_ACTIVATING,
SWAP_ACTIVATING_DONE,
SWAP_DEACTIVATING,
SWAP_DEACTIVATING_SIGTERM,
SWAP_DEACTIVATING_SIGKILL,
SWAP_CLEANING);
}
_pure_ static UnitActiveState swap_active_state(Unit *u) {
assert(u);
return state_translation_table[SWAP(u)->state];
}
_pure_ static const char *swap_sub_state_to_string(Unit *u) {
assert(u);
return swap_state_to_string(SWAP(u)->state);
}
_pure_ static bool swap_may_gc(Unit *u) {
Swap *s = SWAP(u);
assert(s);
if (s->from_proc_swaps)
return false;
return true;
}
_pure_ static bool swap_is_extrinsic(Unit *u) {
assert(SWAP(u));
return MANAGER_IS_USER(u->manager);
}
static void swap_unset_proc_swaps(Swap *s) {
assert(s);
if (!s->from_proc_swaps)
return;
s->parameters_proc_swaps.what = mfree(s->parameters_proc_swaps.what);
s->from_proc_swaps = false;
}
static int swap_set_devnode(Swap *s, const char *devnode) {
Hashmap *swaps;
Swap *first;
int r;
assert(s);
r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &path_hash_ops);
if (r < 0)
return r;
swaps = UNIT(s)->manager->swaps_by_devnode;
if (s->devnode) {
first = hashmap_get(swaps, s->devnode);
LIST_REMOVE(same_devnode, first, s);
if (first)
hashmap_replace(swaps, first->devnode, first);
else
hashmap_remove(swaps, s->devnode);
s->devnode = mfree(s->devnode);
}
if (devnode) {
s->devnode = strdup(devnode);
if (!s->devnode)
return -ENOMEM;
first = hashmap_get(swaps, s->devnode);
LIST_PREPEND(same_devnode, first, s);
return hashmap_replace(swaps, first->devnode, first);
}
return 0;
}
static void swap_init(Unit *u) {
Swap *s = SWAP(u);
assert(s);
assert(UNIT(s)->load_state == UNIT_STUB);
s->timeout_usec = u->manager->default_timeout_start_usec;
s->exec_context.std_output = u->manager->default_std_output;
s->exec_context.std_error = u->manager->default_std_error;
s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
u->ignore_on_isolate = true;
}
static void swap_unwatch_control_pid(Swap *s) {
assert(s);
if (s->control_pid <= 0)
return;
unit_unwatch_pid(UNIT(s), s->control_pid);
s->control_pid = 0;
}
static void swap_done(Unit *u) {
Swap *s = SWAP(u);
assert(s);
swap_unset_proc_swaps(s);
swap_set_devnode(s, NULL);
s->what = mfree(s->what);
s->parameters_fragment.what = mfree(s->parameters_fragment.what);
s->parameters_fragment.options = mfree(s->parameters_fragment.options);
s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
s->control_command = NULL;
dynamic_creds_unref(&s->dynamic_creds);
swap_unwatch_control_pid(s);
s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
}
static int swap_arm_timer(Swap *s, usec_t usec) {
int r;
assert(s);
if (s->timer_event_source) {
r = sd_event_source_set_time(s->timer_event_source, usec);
if (r < 0)
return r;
return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
}
if (usec == USEC_INFINITY)
return 0;
r = sd_event_add_time(
UNIT(s)->manager->event,
&s->timer_event_source,
CLOCK_MONOTONIC,
usec, 0,
swap_dispatch_timer, s);
if (r < 0)
return r;
(void) sd_event_source_set_description(s->timer_event_source, "swap-timer");
return 0;
}
static SwapParameters* swap_get_parameters(Swap *s) {
assert(s);
if (s->from_proc_swaps)
return &s->parameters_proc_swaps;
if (s->from_fragment)
return &s->parameters_fragment;
return NULL;
}
static int swap_add_device_dependencies(Swap *s) {
UnitDependencyMask mask;
SwapParameters *p;
int r;
assert(s);
if (!s->what)
return 0;
p = swap_get_parameters(s);
if (!p || !p->what)
return 0;
mask = s->from_proc_swaps ? UNIT_DEPENDENCY_PROC_SWAP : UNIT_DEPENDENCY_FILE;
if (is_device_path(p->what)) {
r = unit_add_node_dependency(UNIT(s), p->what, UNIT_REQUIRES, mask);
if (r < 0)
return r;
return unit_add_blockdev_dependency(UNIT(s), p->what, mask);
}
/* File based swap devices need to be ordered after systemd-remount-fs.service, since they might need
* a writable file system. */
return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, true, mask);
}
static int swap_add_default_dependencies(Swap *s) {
int r;
assert(s);
if (!UNIT(s)->default_dependencies)
return 0;
if (!MANAGER_IS_SYSTEM(UNIT(s)->manager))
return 0;
if (detect_container() > 0)
return 0;
/* swap units generated for the swap dev links are missing the
* ordering dep against the swap target. */
r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SWAP_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
if (r < 0)
return r;
return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
}
static int swap_verify(Swap *s) {
_cleanup_free_ char *e = NULL;
int r;
assert(UNIT(s)->load_state == UNIT_LOADED);
r = unit_name_from_path(s->what, ".swap", &e);
if (r < 0)
return log_unit_error_errno(UNIT(s), r, "Failed to generate unit name from path: %m");
if (!unit_has_name(UNIT(s), e))
return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Value of What= and unit name do not match, not loading.");
if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP)
return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load.");
return 0;
}
static int swap_load_devnode(Swap *s) {
_cleanup_(sd_device_unrefp) sd_device *d = NULL;
struct stat st;
const char *p;
int r;
assert(s);
if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode))
return 0;
r = sd_device_new_from_stat_rdev(&d, &st);
if (r < 0) {
log_unit_full_errno(UNIT(s), r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
"Failed to allocate device for swap %s: %m", s->what);
return 0;
}
if (sd_device_get_devname(d, &p) < 0)
return 0;
return swap_set_devnode(s, p);
}
static int swap_add_extras(Swap *s) {
int r;
assert(s);
if (UNIT(s)->fragment_path)
s->from_fragment = true;
if (!s->what) {
if (s->parameters_fragment.what)
s->what = strdup(s->parameters_fragment.what);
else if (s->parameters_proc_swaps.what)
s->what = strdup(s->parameters_proc_swaps.what);
else {
r = unit_name_to_path(UNIT(s)->id, &s->what);
if (r < 0)
return r;
}
if (!s->what)
return -ENOMEM;
}
path_simplify(s->what, false);
if (!UNIT(s)->description) {
r = unit_set_description(UNIT(s), s->what);
if (r < 0)
return r;
}
r = unit_require_mounts_for(UNIT(s), s->what, UNIT_DEPENDENCY_IMPLICIT);
if (r < 0)
return r;
r = swap_add_device_dependencies(s);
if (r < 0)
return r;
r = swap_load_devnode(s);
if (r < 0)
return r;
r = unit_patch_contexts(UNIT(s));
if (r < 0)
return r;
r = unit_add_exec_dependencies(UNIT(s), &s->exec_context);
if (r < 0)
return r;
r = unit_set_default_slice(UNIT(s));
if (r < 0)
return r;
r = swap_add_default_dependencies(s);
if (r < 0)
return r;
return 0;
}
static int swap_load(Unit *u) {
Swap *s = SWAP(u);
int r, q = 0;
assert(s);
assert(u->load_state == UNIT_STUB);
/* Load a .swap file */
bool fragment_optional = s->from_proc_swaps;
r = unit_load_fragment_and_dropin(u, !fragment_optional);
/* Add in some extras, and do so either when we successfully loaded something or when /proc/swaps is
* already active. */
if (u->load_state == UNIT_LOADED || s->from_proc_swaps)
q = swap_add_extras(s);
if (r < 0)
return r;
if (q < 0)
return q;
if (u->load_state != UNIT_LOADED)
return 0;
return swap_verify(s);
}
static int swap_setup_unit(
Manager *m,
const char *what,
const char *what_proc_swaps,
int priority,
bool set_flags) {
_cleanup_free_ char *e = NULL;
bool delete = false;
Unit *u = NULL;
int r;
SwapParameters *p;
assert(m);
assert(what);
assert(what_proc_swaps);
r = unit_name_from_path(what, ".swap", &e);
if (r < 0)
return log_unit_error_errno(u, r, "Failed to generate unit name from path: %m");
u = manager_get_unit(m, e);
if (u &&
SWAP(u)->from_proc_swaps &&
!path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps))
return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
"Swap %s appeared twice with different device paths %s and %s",
e, SWAP(u)->parameters_proc_swaps.what, what_proc_swaps);
if (!u) {
delete = true;
r = unit_new_for_name(m, sizeof(Swap), e, &u);
if (r < 0)
goto fail;
SWAP(u)->what = strdup(what);
if (!SWAP(u)->what) {
r = -ENOMEM;
goto fail;
}
unit_add_to_load_queue(u);
} else
delete = false;
p = &SWAP(u)->parameters_proc_swaps;
if (!p->what) {
p->what = strdup(what_proc_swaps);
if (!p->what) {
r = -ENOMEM;
goto fail;
}
}
/* The unit is definitely around now, mark it as loaded if it was previously referenced but could not be
* loaded. After all we can load it now, from the data in /proc/swaps. */
if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) {
u->load_state = UNIT_LOADED;
u->load_error = 0;
}
if (set_flags) {
SWAP(u)->is_active = true;
SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps;
}
SWAP(u)->from_proc_swaps = true;
p->priority = priority;
p->priority_set = true;
unit_add_to_dbus_queue(u);
return 0;
fail:
log_unit_warning_errno(u, r, "Failed to load swap unit: %m");
if (delete)
unit_free(u);
return r;
}
static int swap_process_new(Manager *m, const char *device, int prio, bool set_flags) {
_cleanup_(sd_device_unrefp) sd_device *d = NULL;
const char *dn, *devlink;
struct stat st, st_link;
int r;
assert(m);
r = swap_setup_unit(m, device, device, prio, set_flags);
if (r < 0)
return r;
/* If this is a block device, then let's add duplicates for
* all other names of this block device */
if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode))
return 0;
r = sd_device_new_from_stat_rdev(&d, &st);
if (r < 0) {
log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
"Failed to allocate device for swap %s: %m", device);
return 0;
}
/* Add the main device node */
if (sd_device_get_devname(d, &dn) >= 0 && !streq(dn, device))
swap_setup_unit(m, dn, device, prio, set_flags);
/* Add additional units for all symlinks */
FOREACH_DEVICE_DEVLINK(d, devlink) {
/* Don't bother with the /dev/block links */
if (streq(devlink, device))
continue;
if (path_startswith(devlink, "/dev/block/"))
continue;
if (stat(devlink, &st_link) >= 0 &&
(!S_ISBLK(st_link.st_mode) ||
st_link.st_rdev != st.st_rdev))
continue;
swap_setup_unit(m, devlink, device, prio, set_flags);
}
return 0;
}
static void swap_set_state(Swap *s, SwapState state) {
SwapState old_state;
Swap *other;
assert(s);
if (s->state != state)
bus_unit_send_pending_change_signal(UNIT(s), false);
old_state = s->state;
s->state = state;
if (!SWAP_STATE_WITH_PROCESS(state)) {
s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
swap_unwatch_control_pid(s);
s->control_command = NULL;
s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
}
if (state != old_state)
log_unit_debug(UNIT(s), "Changed %s -> %s", swap_state_to_string(old_state), swap_state_to_string(state));
unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 0);
/* If there other units for the same device node have a job
queued it might be worth checking again if it is runnable
now. This is necessary, since swap_start() refuses
operation with EAGAIN if there's already another job for
the same device node queued. */
LIST_FOREACH_OTHERS(same_devnode, other, s)
if (UNIT(other)->job)
job_add_to_run_queue(UNIT(other)->job);
}
static int swap_coldplug(Unit *u) {
Swap *s = SWAP(u);
SwapState new_state = SWAP_DEAD;
int r;
assert(s);
assert(s->state == SWAP_DEAD);
if (s->deserialized_state != s->state)
new_state = s->deserialized_state;
else if (s->from_proc_swaps)
new_state = SWAP_ACTIVE;
if (new_state == s->state)
return 0;
if (s->control_pid > 0 &&
pid_is_unwaited(s->control_pid) &&
SWAP_STATE_WITH_PROCESS(new_state)) {
r = unit_watch_pid(UNIT(s), s->control_pid, false);
if (r < 0)
return r;
r = swap_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
if (r < 0)
return r;
}
if (!IN_SET(new_state, SWAP_DEAD, SWAP_FAILED)) {
(void) unit_setup_dynamic_creds(u);
(void) unit_setup_exec_runtime(u);
}
swap_set_state(s, new_state);
return 0;
}
static void swap_dump(Unit *u, FILE *f, const char *prefix) {
char buf[FORMAT_TIMESPAN_MAX];
Swap *s = SWAP(u);
SwapParameters *p;
assert(s);
assert(f);
if (s->from_proc_swaps)
p = &s->parameters_proc_swaps;
else if (s->from_fragment)
p = &s->parameters_fragment;
else
p = NULL;
fprintf(f,
"%sSwap State: %s\n"
"%sResult: %s\n"
"%sClean Result: %s\n"
"%sWhat: %s\n"
"%sFrom /proc/swaps: %s\n"
"%sFrom fragment: %s\n"
"%sExtrinsic: %s\n",
prefix, swap_state_to_string(s->state),
prefix, swap_result_to_string(s->result),
prefix, swap_result_to_string(s->clean_result),
prefix, s->what,
prefix, yes_no(s->from_proc_swaps),
prefix, yes_no(s->from_fragment),
prefix, yes_no(swap_is_extrinsic(u)));
if (s->devnode)
fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode);
if (p)
fprintf(f,
"%sPriority: %i\n"
"%sOptions: %s\n",
prefix, p->priority,
prefix, strempty(p->options));
fprintf(f,
"%sTimeoutSec: %s\n",
prefix, format_timespan(buf, sizeof(buf), s->timeout_usec, USEC_PER_SEC));
if (s->control_pid > 0)
fprintf(f,
"%sControl PID: "PID_FMT"\n",
prefix, s->control_pid);
exec_context_dump(&s->exec_context, f, prefix);
kill_context_dump(&s->kill_context, f, prefix);
cgroup_context_dump(UNIT(s), f, prefix);
}
static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
_cleanup_(exec_params_clear) ExecParameters exec_params = {
.flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
.stdin_fd = -1,
.stdout_fd = -1,
.stderr_fd = -1,
.exec_fd = -1,
};
pid_t pid;
int r;
assert(s);
assert(c);
assert(_pid);
r = unit_prepare_exec(UNIT(s));
if (r < 0)
return r;
r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
if (r < 0)
goto fail;
r = unit_set_exec_params(UNIT(s), &exec_params);
if (r < 0)
goto fail;
r = exec_spawn(UNIT(s),
c,
&s->exec_context,
&exec_params,
s->exec_runtime,
&s->dynamic_creds,
&pid);
if (r < 0)
goto fail;
r = unit_watch_pid(UNIT(s), pid, true);
if (r < 0)
goto fail;
*_pid = pid;
return 0;
fail:
s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
return r;
}
static void swap_enter_dead(Swap *s, SwapResult f) {
assert(s);
if (s->result == SWAP_SUCCESS)
s->result = f;
unit_log_result(UNIT(s), s->result == SWAP_SUCCESS, swap_result_to_string(s->result));
unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop);
swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD);
s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
unit_destroy_runtime_data(UNIT(s), &s->exec_context);
unit_unref_uid_gid(UNIT(s), true);
dynamic_creds_destroy(&s->dynamic_creds);
}
static void swap_enter_active(Swap *s, SwapResult f) {
assert(s);
if (s->result == SWAP_SUCCESS)
s->result = f;
swap_set_state(s, SWAP_ACTIVE);
}
static void swap_enter_dead_or_active(Swap *s, SwapResult f) {
assert(s);
if (s->from_proc_swaps) {
Swap *other;
swap_enter_active(s, f);
LIST_FOREACH_OTHERS(same_devnode, other, s)
if (UNIT(other)->job)
swap_enter_dead_or_active(other, f);
} else
swap_enter_dead(s, f);
}
static int state_to_kill_operation(Swap *s, SwapState state) {
if (state == SWAP_DEACTIVATING_SIGTERM) {
if (unit_has_job_type(UNIT(s), JOB_RESTART))
return KILL_RESTART;
else
return KILL_TERMINATE;
}
return KILL_KILL;
}
static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) {
int r;
assert(s);
if (s->result == SWAP_SUCCESS)
s->result = f;
r = unit_kill_context(UNIT(s),
&s->kill_context,
state_to_kill_operation(s, state),
-1,
s->control_pid,
false);
if (r < 0)
goto fail;
if (r > 0) {
r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
if (r < 0)
goto fail;
swap_set_state(s, state);
} else if (state == SWAP_DEACTIVATING_SIGTERM && s->kill_context.send_sigkill)
swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS);
else
swap_enter_dead_or_active(s, SWAP_SUCCESS);
return;
fail:
log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES);
}
static void swap_enter_activating(Swap *s) {
_cleanup_free_ char *opts = NULL;
int r;
assert(s);
unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start);
s->control_command_id = SWAP_EXEC_ACTIVATE;
s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
if (s->from_fragment) {
int priority = 0;
r = fstab_find_pri(s->parameters_fragment.options, &priority);
if (r < 0)
log_unit_warning_errno(UNIT(s), r, "Failed to parse swap priority \"%s\", ignoring: %m", s->parameters_fragment.options);
else if (r > 0 && s->parameters_fragment.priority_set)
log_unit_warning(UNIT(s), "Duplicate swap priority configuration by Priority= and Options= fields.");
if (r <= 0 && s->parameters_fragment.priority_set) {
if (s->parameters_fragment.options)
r = asprintf(&opts, "%s,pri=%i", s->parameters_fragment.options, s->parameters_fragment.priority);
else
r = asprintf(&opts, "pri=%i", s->parameters_fragment.priority);
if (r < 0) {
r = -ENOMEM;
goto fail;
}
}
}
r = exec_command_set(s->control_command, "/sbin/swapon", NULL);
if (r < 0)
goto fail;
if (s->parameters_fragment.options || opts) {
r = exec_command_append(s->control_command, "-o",
opts ?: s->parameters_fragment.options, NULL);
if (r < 0)
goto fail;
}
r = exec_command_append(s->control_command, s->what, NULL);
if (r < 0)
goto fail;
swap_unwatch_control_pid(s);
r = swap_spawn(s, s->control_command, &s->control_pid);
if (r < 0)
goto fail;
swap_set_state(s, SWAP_ACTIVATING);
return;
fail:
log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapon' task: %m");
swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES);
}
static void swap_enter_deactivating(Swap *s) {
int r;
assert(s);
s->control_command_id = SWAP_EXEC_DEACTIVATE;
s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
r = exec_command_set(s->control_command,
"/sbin/swapoff",
s->what,
NULL);
if (r < 0)
goto fail;
swap_unwatch_control_pid(s);
r = swap_spawn(s, s->control_command, &s->control_pid);
if (r < 0)
goto fail;
swap_set_state(s, SWAP_DEACTIVATING);
return;
fail:
log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapoff' task: %m");
swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES);
}
static void swap_cycle_clear(Swap *s) {
assert(s);
s->result = SWAP_SUCCESS;
exec_command_reset_status_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
UNIT(s)->reset_accounting = true;
}
static int swap_start(Unit *u) {
Swap *s = SWAP(u), *other;
int r;
assert(s);
/* We cannot fulfill this request right now, try again later please! */
if (IN_SET(s->state,
SWAP_DEACTIVATING,
SWAP_DEACTIVATING_SIGTERM,
SWAP_DEACTIVATING_SIGKILL,
SWAP_CLEANING))
return -EAGAIN;
/* Already on it! */
if (s->state == SWAP_ACTIVATING)
return 0;
assert(IN_SET(s->state, SWAP_DEAD, SWAP_FAILED));
if (detect_container() > 0)
return -EPERM;
/* If there's a job for another swap unit for the same node
* running, then let's not dispatch this one for now, and wait
* until that other job has finished. */
LIST_FOREACH_OTHERS(same_devnode, other, s)
if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING)
return -EAGAIN;
r = unit_test_start_limit(u);
if (r < 0) {
swap_enter_dead(s, SWAP_FAILURE_START_LIMIT_HIT);
return r;
}
r = unit_acquire_invocation_id(u);
if (r < 0)
return r;
swap_cycle_clear(s);
swap_enter_activating(s);
return 1;
}
static int swap_stop(Unit *u) {
Swap *s = SWAP(u);
assert(s);
switch (s->state) {
case SWAP_DEACTIVATING:
case SWAP_DEACTIVATING_SIGTERM:
case SWAP_DEACTIVATING_SIGKILL:
/* Already on it */
return 0;
case SWAP_ACTIVATING:
case SWAP_ACTIVATING_DONE:
/* There's a control process pending, directly enter kill mode */
swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_SUCCESS);
return 0;
case SWAP_ACTIVE:
if (detect_container() > 0)
return -EPERM;
swap_enter_deactivating(s);
return 1;
case SWAP_CLEANING:
/* If we are currently cleaning, then abort it, brutally. */
swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS);
return 0;
default:
assert_not_reached("Unexpected state.");
}
}
static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
Swap *s = SWAP(u);
assert(s);
assert(f);
assert(fds);
(void) serialize_item(f, "state", swap_state_to_string(s->state));
(void) serialize_item(f, "result", swap_result_to_string(s->result));