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Systemd/src/core/swap.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <limits.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/epoll.h>
#include <sys/stat.h>
#include <sys/swap.h>
#include <libudev.h>
#include "unit.h"
#include "swap.h"
#include "load-fragment.h"
#include "load-dropin.h"
#include "unit-name.h"
#include "dbus-swap.h"
#include "special.h"
#include "bus-errors.h"
#include "exit-status.h"
#include "def.h"
#include "path-util.h"
#include "virt.h"
static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
[SWAP_DEAD] = UNIT_INACTIVE,
[SWAP_ACTIVATING] = UNIT_ACTIVATING,
[SWAP_ACTIVE] = UNIT_ACTIVE,
[SWAP_DEACTIVATING] = UNIT_DEACTIVATING,
[SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
[SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
[SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
[SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
[SWAP_FAILED] = UNIT_FAILED
};
static void swap_unset_proc_swaps(Swap *s) {
Swap *first;
Hashmap *swaps;
assert(s);
if (!s->parameters_proc_swaps.what)
return;
/* Remove this unit from the chain of swaps which share the
* same kernel swap device. */
swaps = UNIT(s)->manager->swaps_by_proc_swaps;
first = hashmap_get(swaps, s->parameters_proc_swaps.what);
LIST_REMOVE(Swap, same_proc_swaps, first, s);
if (first)
hashmap_remove_and_replace(swaps,
s->parameters_proc_swaps.what,
first->parameters_proc_swaps.what,
first);
else
hashmap_remove(swaps, s->parameters_proc_swaps.what);
free(s->parameters_proc_swaps.what);
s->parameters_proc_swaps.what = NULL;
}
static void swap_init(Unit *u) {
Swap *s = SWAP(u);
assert(s);
assert(UNIT(s)->load_state == UNIT_STUB);
s->timeout_usec = DEFAULT_TIMEOUT_USEC;
exec_context_init(&s->exec_context);
s->exec_context.std_output = u->manager->default_std_output;
s->exec_context.std_error = u->manager->default_std_error;
kill_context_init(&s->kill_context);
s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1;
s->timer_watch.type = WATCH_INVALID;
s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
UNIT(s)->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);
free(s->what);
s->what = NULL;
free(s->parameters_fragment.what);
s->parameters_fragment.what = NULL;
exec_context_done(&s->exec_context);
exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
s->control_command = NULL;
swap_unwatch_control_pid(s);
unit_unwatch_timer(u, &s->timer_watch);
}
int swap_add_one_mount_link(Swap *s, Mount *m) {
int r;
assert(s);
assert(m);
if (UNIT(s)->load_state != UNIT_LOADED ||
UNIT(m)->load_state != UNIT_LOADED)
return 0;
if (is_device_path(s->what))
return 0;
if (!path_startswith(s->what, m->where))
return 0;
r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
if (r < 0)
return r;
return 0;
}
static int swap_add_mount_links(Swap *s) {
Unit *other;
int r;
assert(s);
LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_MOUNT])
if ((r = swap_add_one_mount_link(s, MOUNT(other))) < 0)
return r;
return 0;
}
static int swap_add_device_links(Swap *s) {
SwapParameters *p;
assert(s);
if (!s->what)
return 0;
if (s->from_fragment)
p = &s->parameters_fragment;
else
return 0;
if (is_device_path(s->what))
return unit_add_node_link(UNIT(s), s->what,
!p->noauto && p->nofail &&
UNIT(s)->manager->running_as == SYSTEMD_SYSTEM);
else
/* 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, NULL, true);
}
static int swap_add_default_dependencies(Swap *s) {
int r;
assert(s);
if (UNIT(s)->manager->running_as != SYSTEMD_SYSTEM)
return 0;
if (detect_container(NULL) > 0)
return 0;
r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
if (r < 0)
return r;
return 0;
}
static int swap_verify(Swap *s) {
bool b;
char _cleanup_free_ *e = NULL;
if (UNIT(s)->load_state != UNIT_LOADED)
return 0;
e = unit_name_from_path(s->what, ".swap");
if (e == NULL)
return log_oom();
b = unit_has_name(UNIT(s), e);
if (!b) {
log_error("%s: Value of \"What\" and unit name do not match, not loading.", UNIT(s)->id);
return -EINVAL;
}
if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load.", UNIT(s)->id);
return -EINVAL;
}
return 0;
}
static int swap_load(Unit *u) {
int r;
Swap *s = SWAP(u);
assert(s);
assert(u->load_state == UNIT_STUB);
/* Load a .swap file */
r = unit_load_fragment_and_dropin_optional(u);
if (r < 0)
return r;
if (u->load_state == UNIT_LOADED) {
r = unit_add_exec_dependencies(u, &s->exec_context);
if (r < 0)
return r;
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
s->what = unit_name_to_path(u->id);
if (!s->what)
return -ENOMEM;
}
path_kill_slashes(s->what);
if (!UNIT(s)->description)
if ((r = unit_set_description(u, s->what)) < 0)
return r;
r = swap_add_device_links(s);
if (r < 0)
return r;
r = swap_add_mount_links(s);
if (r < 0)
return r;
r = unit_add_default_cgroups(u);
if (r < 0)
return r;
if (UNIT(s)->default_dependencies) {
r = swap_add_default_dependencies(s);
if (r < 0)
return r;
}
r = unit_exec_context_defaults(u, &s->exec_context);
if (r < 0)
return r;
}
return swap_verify(s);
}
static int swap_add_one(
Manager *m,
const char *what,
const char *what_proc_swaps,
int priority,
bool noauto,
bool nofail,
bool set_flags) {
Unit *u = NULL;
char _cleanup_free_ *e = NULL;
char *wp = NULL;
bool delete = false;
int r;
SwapParameters *p;
Swap *first;
assert(m);
assert(what);
assert(what_proc_swaps);
e = unit_name_from_path(what, ".swap");
if (!e)
return log_oom();
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 -EEXIST;
if (!u) {
delete = true;
u = unit_new(m, sizeof(Swap));
if (!u)
return log_oom();
r = unit_add_name(u, e);
if (r < 0)
goto fail;
SWAP(u)->what = strdup(what);
if (!SWAP(u)->what) {
r = log_oom();
goto fail;
}
unit_add_to_load_queue(u);
} else
delete = false;
p = &SWAP(u)->parameters_proc_swaps;
if (!p->what) {
wp = strdup(what_proc_swaps);
if (!wp) {
r = log_oom();
goto fail;
}
if (!m->swaps_by_proc_swaps) {
m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func);
if (!m->swaps_by_proc_swaps) {
r = log_oom();
goto fail;
}
}
free(p->what);
p->what = wp;
first = hashmap_get(m->swaps_by_proc_swaps, wp);
LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u));
r = hashmap_replace(m->swaps_by_proc_swaps, wp, first);
if (r < 0)
goto fail;
}
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->noauto = noauto;
p->nofail = nofail;
unit_add_to_dbus_queue(u);
return 0;
fail:
log_warning("Failed to load swap unit: %s", strerror(-r));
free(wp);
if (delete && u)
unit_free(u);
return r;
}
static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) {
struct stat st;
int r = 0, k;
assert(m);
if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) {
struct udev_device *d;
const char *dn;
struct udev_list_entry *item = NULL, *first = NULL;
/* So this is a proper swap device. Create swap units
* for all names this swap device is known under */
d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev);
if (!d)
return log_oom();
dn = udev_device_get_devnode(d);
/* Skip dn==device, since that case will be handled below */
if (dn && !streq(dn, device))
r = swap_add_one(m, dn, device, prio, false, false, set_flags);
/* Add additional units for all symlinks */
first = udev_device_get_devlinks_list_entry(d);
udev_list_entry_foreach(item, first) {
const char *p;
/* Don't bother with the /dev/block links */
p = udev_list_entry_get_name(item);
if (path_startswith(p, "/dev/block/"))
continue;
if (stat(p, &st) >= 0)
if ((!S_ISBLK(st.st_mode)) ||
st.st_rdev != udev_device_get_devnum(d))
continue;
k = swap_add_one(m, p, device, prio, false, false, set_flags);
if (k < 0)
r = k;
}
udev_device_unref(d);
}
k = swap_add_one(m, device, device, prio, false, false, set_flags);
if (k < 0)
r = k;
return r;
}
static void swap_set_state(Swap *s, SwapState state) {
SwapState old_state;
assert(s);
old_state = s->state;
s->state = state;
if (state != SWAP_ACTIVATING &&
state != SWAP_ACTIVATING_SIGTERM &&
state != SWAP_ACTIVATING_SIGKILL &&
state != SWAP_DEACTIVATING &&
state != SWAP_DEACTIVATING_SIGTERM &&
state != SWAP_DEACTIVATING_SIGKILL) {
unit_unwatch_timer(UNIT(s), &s->timer_watch);
swap_unwatch_control_pid(s);
s->control_command = NULL;
s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
}
if (state != old_state)
log_debug("%s changed %s -> %s",
UNIT(s)->id,
swap_state_to_string(old_state),
swap_state_to_string(state));
unit_notify(UNIT(s), state_translation_table[old_state],
state_translation_table[state], true);
}
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) {
if (new_state == SWAP_ACTIVATING ||
new_state == SWAP_ACTIVATING_SIGTERM ||
new_state == SWAP_ACTIVATING_SIGKILL ||
new_state == SWAP_DEACTIVATING ||
new_state == SWAP_DEACTIVATING_SIGTERM ||
new_state == SWAP_DEACTIVATING_SIGKILL) {
if (s->control_pid <= 0)
return -EBADMSG;
r = unit_watch_pid(UNIT(s), s->control_pid);
if (r < 0)
return r;
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch);
if (r < 0)
return r;
}
swap_set_state(s, new_state);
}
return 0;
}
static void swap_dump(Unit *u, FILE *f, const char *prefix) {
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"
"%sWhat: %s\n"
"%sFrom /proc/swaps: %s\n"
"%sFrom fragment: %s\n",
prefix, swap_state_to_string(s->state),
prefix, swap_result_to_string(s->result),
prefix, s->what,
prefix, yes_no(s->from_proc_swaps),
prefix, yes_no(s->from_fragment));
if (p)
fprintf(f,
"%sPriority: %i\n"
"%sNoAuto: %s\n"
"%sNoFail: %s\n",
prefix, p->priority,
prefix, yes_no(p->noauto),
prefix, yes_no(p->nofail));
if (s->control_pid > 0)
fprintf(f,
"%sControl PID: %lu\n",
prefix, (unsigned long) s->control_pid);
exec_context_dump(&s->exec_context, f, prefix);
kill_context_dump(&s->kill_context, f, prefix);
}
static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
pid_t pid;
int r;
assert(s);
assert(c);
assert(_pid);
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch);
if (r < 0)
goto fail;
r = exec_spawn(c,
NULL,
&s->exec_context,
NULL, 0,
UNIT(s)->manager->environment,
true,
true,
true,
UNIT(s)->manager->confirm_spawn,
UNIT(s)->cgroup_bondings,
UNIT(s)->cgroup_attributes,
NULL,
UNIT(s)->id,
NULL,
&pid);
if (r < 0)
goto fail;
r = unit_watch_pid(UNIT(s), pid);
if (r < 0)
/* FIXME: we need to do something here */
goto fail;
*_pid = pid;
return 0;
fail:
unit_unwatch_timer(UNIT(s), &s->timer_watch);
return r;
}
static void swap_enter_dead(Swap *s, SwapResult f) {
assert(s);
if (f != SWAP_SUCCESS)
s->result = f;
swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD);
}
static void swap_enter_active(Swap *s, SwapResult f) {
assert(s);
if (f != SWAP_SUCCESS)
s->result = f;
swap_set_state(s, SWAP_ACTIVE);
}
static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) {
int r;
Set *pid_set = NULL;
bool wait_for_exit = false;
assert(s);
if (f != SWAP_SUCCESS)
s->result = f;
if (s->kill_context.kill_mode != KILL_NONE) {
int sig = (state == SWAP_ACTIVATING_SIGTERM ||
state == SWAP_DEACTIVATING_SIGTERM) ? s->kill_context.kill_signal : SIGKILL;
if (s->control_pid > 0) {
if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
else
wait_for_exit = true;
}
if (s->kill_context.kill_mode == KILL_CONTROL_GROUP) {
pid_set = set_new(trivial_hash_func, trivial_compare_func);
if (!pid_set) {
r = log_oom();
goto fail;
}
/* Exclude the control pid from being killed via the cgroup */
if (s->control_pid > 0) {
r = set_put(pid_set, LONG_TO_PTR(s->control_pid));
if (r < 0)
goto fail;
}
r = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, sig, true, false, pid_set, NULL);
if (r < 0) {
if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
log_warning("Failed to kill control group: %s", strerror(-r));
} else if (r > 0)
wait_for_exit = true;
set_free(pid_set);
pid_set = NULL;
}
}
if (wait_for_exit) {
r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch);
if (r < 0)
goto fail;
swap_set_state(s, state);
} else
swap_enter_dead(s, SWAP_SUCCESS);
return;
fail:
log_warning("%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
if (pid_set)
set_free(pid_set);
}
static void swap_enter_activating(Swap *s) {
int r, priority;
assert(s);
s->control_command_id = SWAP_EXEC_ACTIVATE;
s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
if (s->from_fragment)
priority = s->parameters_fragment.priority;
else
priority = -1;
if (priority >= 0) {
char p[LINE_MAX];
snprintf(p, sizeof(p), "%i", priority);
char_array_0(p);
r = exec_command_set(
s->control_command,
"/sbin/swapon",
"-p",
p,
s->what,
NULL);
} else
r = exec_command_set(
s->control_command,
"/sbin/swapon",
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_warning("%s failed to run 'swapon' task: %s", UNIT(s)->id, strerror(-r));
swap_enter_dead(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_warning("%s failed to run 'swapoff' task: %s", UNIT(s)->id, strerror(-r));
swap_enter_active(s, SWAP_FAILURE_RESOURCES);
}
static int swap_start(Unit *u) {
Swap *s = SWAP(u);
assert(s);
/* We cannot fulfill this request right now, try again later
* please! */
if (s->state == SWAP_DEACTIVATING ||
s->state == SWAP_DEACTIVATING_SIGTERM ||
s->state == SWAP_DEACTIVATING_SIGKILL ||
s->state == SWAP_ACTIVATING_SIGTERM ||
s->state == SWAP_ACTIVATING_SIGKILL)
return -EAGAIN;
if (s->state == SWAP_ACTIVATING)
return 0;
assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED);
if (detect_container(NULL) > 0)
return -EPERM;
s->result = SWAP_SUCCESS;
swap_enter_activating(s);
return 0;
}
static int swap_stop(Unit *u) {
Swap *s = SWAP(u);
assert(s);
if (s->state == SWAP_DEACTIVATING ||
s->state == SWAP_DEACTIVATING_SIGTERM ||
s->state == SWAP_DEACTIVATING_SIGKILL ||
s->state == SWAP_ACTIVATING_SIGTERM ||
s->state == SWAP_ACTIVATING_SIGKILL)
return 0;
assert(s->state == SWAP_ACTIVATING ||
s->state == SWAP_ACTIVE);
if (detect_container(NULL) > 0)
return -EPERM;
swap_enter_deactivating(s);
return 0;
}
static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
Swap *s = SWAP(u);
assert(s);
assert(f);
assert(fds);
unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
unit_serialize_item(u, f, "result", swap_result_to_string(s->result));
if (s->control_pid > 0)
unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
if (s->control_command_id >= 0)
unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id));
return 0;
}
static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
Swap *s = SWAP(u);
assert(s);
assert(fds);
if (streq(key, "state")) {
SwapState state;
state = swap_state_from_string(value);
if (state < 0)
log_debug("Failed to parse state value %s", value);
else
s->deserialized_state = state;
} else if (streq(key, "result")) {
SwapResult f;
f = swap_result_from_string(value);
if (f < 0)
log_debug("Failed to parse result value %s", value);
else if (f != SWAP_SUCCESS)
s->result = f;
} else if (streq(key, "control-pid")) {
pid_t pid;
if (parse_pid(value, &pid) < 0)
log_debug("Failed to parse control-pid value %s", value);
else
s->control_pid = pid;
} else if (streq(key, "control-command")) {
SwapExecCommand id;
id = swap_exec_command_from_string(value);
if (id < 0)
log_debug("Failed to parse exec-command value %s", value);
else {
s->control_command_id = id;
s->control_command = s->exec_command + id;
}
} else
log_debug("Unknown serialization key '%s'", key);
return 0;
}
static UnitActiveState swap_active_state(Unit *u) {
assert(u);
return state_translation_table[SWAP(u)->state];
}
static const char *swap_sub_state_to_string(Unit *u) {
assert(u);
return swap_state_to_string(SWAP(u)->state);
}
static bool swap_check_gc(Unit *u) {
Swap *s = SWAP(u);
assert(s);
return s->from_proc_swaps;
}
static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
Swap *s = SWAP(u);
SwapResult f;
assert(s);
assert(pid >= 0);
if (pid != s->control_pid)
return;
s->control_pid = 0;
if (is_clean_exit(code, status, NULL))
f = SWAP_SUCCESS;
else if (code == CLD_EXITED)
f = SWAP_FAILURE_EXIT_CODE;
else if (code == CLD_KILLED)
f = SWAP_FAILURE_SIGNAL;
else if (code == CLD_DUMPED)
f = SWAP_FAILURE_CORE_DUMP;
else
assert_not_reached("Unknown code");
if (f != SWAP_SUCCESS)
s->result = f;
if (s->control_command) {
exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
s->control_command = NULL;
s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
}
log_full(f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
"%s swap process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status);
switch (s->state) {
case SWAP_ACTIVATING:
case SWAP_ACTIVATING_SIGTERM:
case SWAP_ACTIVATING_SIGKILL:
if (f == SWAP_SUCCESS)
swap_enter_active(s, f);
else
swap_enter_dead(s, f);
break;
case SWAP_DEACTIVATING:
case SWAP_DEACTIVATING_SIGKILL:
case SWAP_DEACTIVATING_SIGTERM:
if (f == SWAP_SUCCESS)
swap_enter_dead(s, f);
else
swap_enter_dead(s, f);
break;
default:
assert_not_reached("Uh, control process died at wrong time.");
}
/* Notify clients about changed exit status */
unit_add_to_dbus_queue(u);
/* Request a reload of /proc/swaps, so that following units
* can follow our state change */
u->manager->request_reload = true;
}
static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
Swap *s = SWAP(u);
assert(s);
assert(elapsed == 1);
assert(w == &s->timer_watch);
switch (s->state) {
case SWAP_ACTIVATING:
log_warning("%s activation timed out. Stopping.", u->id);
swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
break;
case SWAP_DEACTIVATING:
log_warning("%s deactivation timed out. Stopping.", u->id);
swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
break;
case SWAP_ACTIVATING_SIGTERM:
if (s->kill_context.send_sigkill) {
log_warning("%s activation timed out. Killing.", u->id);
swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
} else {
log_warning("%s activation timed out. Skipping SIGKILL. Ignoring.", u->id);
swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
}
break;
case SWAP_DEACTIVATING_SIGTERM:
if (s->kill_context.send_sigkill) {
log_warning("%s deactivation timed out. Killing.", u->id);
swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
} else {
log_warning("%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->id);
swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
}
break;
case SWAP_ACTIVATING_SIGKILL:
case SWAP_DEACTIVATING_SIGKILL:
log_warning("%s swap process still around after SIGKILL. Ignoring.", u->id);
swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
break;
default:
assert_not_reached("Timeout at wrong time.");
}
}
static int swap_load_proc_swaps(Manager *m, bool set_flags) {
unsigned i;
int r = 0;
assert(m);
rewind(m->proc_swaps);
(void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
for (i = 1;; i++) {
char *dev = NULL, *d;
int prio = 0, k;
k = fscanf(m->proc_swaps,
"%ms " /* device/file */
"%*s " /* type of swap */
"%*s " /* swap size */
"%*s " /* used */
"%i\n", /* priority */
&dev, &prio);
if (k != 2) {
if (k == EOF)
break;
log_warning("Failed to parse /proc/swaps:%u", i);
free(dev);
continue;
}
d = cunescape(dev);
free(dev);
if (!d)
return -ENOMEM;
k = swap_process_new_swap(m, d, prio, set_flags);
free(d);
if (k < 0)
r = k;
}
return r;
}
int swap_dispatch_reload(Manager *m) {
/* This function should go as soon as the kernel properly notifies us */
if (_likely_(!m->request_reload))
return 0;
m->request_reload = false;
return swap_fd_event(m, EPOLLPRI);
}
int swap_fd_event(Manager *m, int events) {
Unit *u;
int r;
assert(m);
assert(events & EPOLLPRI);
r = swap_load_proc_swaps(m, true);
if (r < 0) {
log_error("Failed to reread /proc/swaps: %s", strerror(-r));
/* Reset flags, just in case, for late calls */
LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
Swap *swap = SWAP(u);
swap->is_active = swap->just_activated = false;
}
return 0;
}
manager_dispatch_load_queue(m);
LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
Swap *swap = SWAP(u);
if (!swap->is_active) {
/* This has just been deactivated */
swap->from_proc_swaps = false;
swap_unset_proc_swaps(swap);
switch (swap->state) {
case SWAP_ACTIVE:
swap_enter_dead(swap, SWAP_SUCCESS);
break;
default:
swap_set_state(swap, swap->state);
break;
}
} else if (swap->just_activated) {
/* New swap entry */
switch (swap->state) {
case SWAP_DEAD:
case SWAP_FAILED:
swap_enter_active(swap, SWAP_SUCCESS);
break;
default:
/* Nothing really changed, but let's
* issue an notification call
* nonetheless, in case somebody is
* waiting for this. */
swap_set_state(swap, swap->state);
break;
}
}
/* Reset the flags for later calls */
swap->is_active = swap->just_activated = false;
}
return 1;
}
static Unit *swap_following(Unit *u) {
Swap *s = SWAP(u);
Swap *other, *first = NULL;
assert(s);
if (streq_ptr(s->what, s->parameters_proc_swaps.what))
return NULL;
/* Make everybody follow the unit that's named after the swap
* device in the kernel */
LIST_FOREACH_AFTER(same_proc_swaps, other, s)
if (streq_ptr(other->what, other->parameters_proc_swaps.what))
return UNIT(other);
LIST_FOREACH_BEFORE(same_proc_swaps, other, s) {
if (streq_ptr(other->what, other->parameters_proc_swaps.what))
return UNIT(other);
first = other;
}
return UNIT(first);
}
static int swap_following_set(Unit *u, Set **_set) {
Swap *s = SWAP(u);
Swap *other;
Set *set;
int r;
assert(s);
assert(_set);
if (LIST_JUST_US(same_proc_swaps, s)) {
*_set = NULL;
return 0;
}
if (!(set = set_new(NULL, NULL)))
return -ENOMEM;
LIST_FOREACH_AFTER(same_proc_swaps, other, s)
if ((r = set_put(set, other)) < 0)
goto fail;
LIST_FOREACH_BEFORE(same_proc_swaps, other, s)
if ((r = set_put(set, other)) < 0)
goto fail;
*_set = set;
return 1;
fail:
set_free(set);
return r;
}
static void swap_shutdown(Manager *m) {
assert(m);
if (m->proc_swaps) {
fclose(m->proc_swaps);
m->proc_swaps = NULL;
}
hashmap_free(m->swaps_by_proc_swaps);
m->swaps_by_proc_swaps = NULL;
}
static int swap_enumerate(Manager *m) {
int r;
struct epoll_event ev;
assert(m);
if (!m->proc_swaps) {
m->proc_swaps = fopen("/proc/swaps", "re");
if (!m->proc_swaps)
return (errno == ENOENT) ? 0 : -errno;
m->swap_watch.type = WATCH_SWAP;
m->swap_watch.fd = fileno(m->proc_swaps);
zero(ev);
ev.events = EPOLLPRI;
ev.data.ptr = &m->swap_watch;
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0)
return -errno;
}
r = swap_load_proc_swaps(m, false);
if (r < 0)
swap_shutdown(m);
return r;
}
static void swap_reset_failed(Unit *u) {
Swap *s = SWAP(u);
assert(s);
if (s->state == SWAP_FAILED)
swap_set_state(s, SWAP_DEAD);
s->result = SWAP_SUCCESS;
}
static int swap_kill(Unit *u, KillWho who, int signo, DBusError *error) {
Swap *s = SWAP(u);
int r = 0;
Set *pid_set = NULL;
assert(s);
if (who == KILL_MAIN) {
dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes");
return -ESRCH;
}
if (s->control_pid <= 0 && who == KILL_CONTROL) {
dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
return -ESRCH;
}
if (who == KILL_CONTROL || who == KILL_ALL)
if (s->control_pid > 0)
if (kill(s->control_pid, signo) < 0)
r = -errno;
if (who == KILL_ALL) {
int q;
pid_set = set_new(trivial_hash_func, trivial_compare_func);
if (!pid_set)
return -ENOMEM;
/* Exclude the control pid from being killed via the cgroup */
if (s->control_pid > 0) {
q = set_put(pid_set, LONG_TO_PTR(s->control_pid));
if (q < 0) {
r = q;
goto finish;
}
}
q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, false, pid_set, NULL);
if (q < 0 && q != -EAGAIN && q != -ESRCH && q != -ENOENT)
r = q;
}
finish:
if (pid_set)
set_free(pid_set);
return r;
}
static const char* const swap_state_table[_SWAP_STATE_MAX] = {
[SWAP_DEAD] = "dead",
[SWAP_ACTIVATING] = "activating",
[SWAP_ACTIVE] = "active",
[SWAP_DEACTIVATING] = "deactivating",
[SWAP_ACTIVATING_SIGTERM] = "activating-sigterm",
[SWAP_ACTIVATING_SIGKILL] = "activating-sigkill",
[SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm",
[SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill",
[SWAP_FAILED] = "failed"
};
DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
[SWAP_EXEC_ACTIVATE] = "ExecActivate",
[SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
};
DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
static const char* const swap_result_table[_SWAP_RESULT_MAX] = {
[SWAP_SUCCESS] = "success",
[SWAP_FAILURE_RESOURCES] = "resources",
[SWAP_FAILURE_TIMEOUT] = "timeout",
[SWAP_FAILURE_EXIT_CODE] = "exit-code",
[SWAP_FAILURE_SIGNAL] = "signal",
[SWAP_FAILURE_CORE_DUMP] = "core-dump"
};
DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult);
const UnitVTable swap_vtable = {
.object_size = sizeof(Swap),
.exec_context_offset = offsetof(Swap, exec_context),
.sections =
"Unit\0"
"Swap\0"
"Install\0",
.no_alias = true,
.no_instances = true,
.init = swap_init,
.load = swap_load,
.done = swap_done,
.coldplug = swap_coldplug,
.dump = swap_dump,
.start = swap_start,
.stop = swap_stop,
.kill = swap_kill,
.serialize = swap_serialize,
.deserialize_item = swap_deserialize_item,
.active_state = swap_active_state,
.sub_state_to_string = swap_sub_state_to_string,
.check_gc = swap_check_gc,
.sigchld_event = swap_sigchld_event,
.timer_event = swap_timer_event,
.reset_failed = swap_reset_failed,
.bus_interface = "org.freedesktop.systemd1.Swap",
.bus_message_handler = bus_swap_message_handler,
.bus_invalidating_properties = bus_swap_invalidating_properties,
.following = swap_following,
.following_set = swap_following_set,
.enumerate = swap_enumerate,
.shutdown = swap_shutdown,
.status_message_formats = {
.starting_stopping = {
[0] = "Activating swap %s...",
[1] = "Deactivating swap %s...",
},
.finished_start_job = {
[JOB_DONE] = "Activated swap %s.",
[JOB_FAILED] = "Failed to activate swap %s.",
[JOB_DEPENDENCY] = "Dependency failed for %s.",
[JOB_TIMEOUT] = "Timed out activating swap %s.",
},
.finished_stop_job = {
[JOB_DONE] = "Deactivated swap %s.",
[JOB_FAILED] = "Failed deactivating swap %s.",
[JOB_TIMEOUT] = "Timed out deactivating swap %s.",
},
},
};
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