summaryrefslogtreecommitdiff
path: root/src/core/swap.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/core/swap.c')
-rw-r--r--src/core/swap.c1415
1 files changed, 1415 insertions, 0 deletions
diff --git a/src/core/swap.c b/src/core/swap.c
new file mode 100644
index 0000000000..9c72732b94
--- /dev/null
+++ b/src/core/swap.c
@@ -0,0 +1,1415 @@
+/*-*- 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 General Public License as published by
+ the Free Software Foundation; either version 2 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU 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"
+
+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;
+
+ assert(s);
+
+ if (!s->parameters_proc_swaps.what)
+ return;
+
+ /* Remove this unit from the chain of swaps which share the
+ * same kernel swap device. */
+
+ first = hashmap_get(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what);
+ LIST_REMOVE(Swap, same_proc_swaps, first, s);
+
+ if (first)
+ hashmap_remove_and_replace(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first);
+ else
+ hashmap_remove(UNIT(s)->manager->swaps_by_proc_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;
+
+ s->parameters_etc_fstab.priority = 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_etc_fstab.what);
+ free(s->parameters_fragment.what);
+ s->parameters_etc_fstab.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;
+
+ if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 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_target_links(Swap *s) {
+ Unit *tu;
+ SwapParameters *p;
+ int r;
+
+ assert(s);
+
+ if (s->from_fragment)
+ p = &s->parameters_fragment;
+ else if (s->from_etc_fstab)
+ p = &s->parameters_etc_fstab;
+ else
+ return 0;
+
+ if ((r = manager_load_unit(UNIT(s)->manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0)
+ return r;
+
+ if (!p->noauto &&
+ !p->nofail &&
+ (p->handle || UNIT(s)->manager->swap_auto) &&
+ s->from_etc_fstab &&
+ UNIT(s)->manager->running_as == MANAGER_SYSTEM)
+ if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 0)
+ return r;
+
+ return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true);
+}
+
+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 if (s->from_etc_fstab)
+ p = &s->parameters_etc_fstab;
+ 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 == MANAGER_SYSTEM);
+ else
+ /* File based swap devices need to be ordered after
+ * remount-rootfs.service, since they might need a
+ * writable file system. */
+ return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_ROOTFS_SERVICE, NULL, true);
+}
+
+static int swap_add_default_dependencies(Swap *s) {
+ int r;
+
+ assert(s);
+
+ if (UNIT(s)->manager->running_as == MANAGER_SYSTEM) {
+
+ if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int swap_verify(Swap *s) {
+ bool b;
+ char *e;
+
+ if (UNIT(s)->load_state != UNIT_LOADED)
+ return 0;
+
+ if (!(e = unit_name_from_path(s->what, ".swap")))
+ return -ENOMEM;
+
+ b = unit_has_name(UNIT(s), e);
+ free(e);
+
+ if (!b) {
+ log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", UNIT(s)->id);
+ return -EINVAL;
+ }
+
+ if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
+ log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", 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 */
+ if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
+ return r;
+
+ if (u->load_state == UNIT_LOADED) {
+ if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 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_etc_fstab.what)
+ s->what = strdup(s->parameters_etc_fstab.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;
+
+ if ((r = swap_add_device_links(s)) < 0)
+ return r;
+
+ if ((r = swap_add_mount_links(s)) < 0)
+ return r;
+
+ if ((r = swap_add_target_links(s)) < 0)
+ return r;
+
+ if ((r = unit_add_default_cgroups(u)) < 0)
+ return r;
+
+ if (UNIT(s)->default_dependencies)
+ if ((r = swap_add_default_dependencies(s)) < 0)
+ return r;
+ }
+
+ return swap_verify(s);
+}
+
+int swap_add_one(
+ Manager *m,
+ const char *what,
+ const char *what_proc_swaps,
+ int priority,
+ bool noauto,
+ bool nofail,
+ bool handle,
+ bool set_flags) {
+
+ Unit *u = NULL;
+ char *e = NULL, *wp = NULL;
+ bool delete = false;
+ int r;
+ SwapParameters *p;
+
+ assert(m);
+ assert(what);
+
+ e = unit_name_from_path(what, ".swap");
+ if (!e)
+ return -ENOMEM;
+
+ u = manager_get_unit(m, e);
+
+ if (what_proc_swaps &&
+ 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) {
+ free(e);
+ return -ENOMEM;
+ }
+
+ r = unit_add_name(u, e);
+ 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;
+
+ if (what_proc_swaps) {
+ Swap *first;
+
+ p = &SWAP(u)->parameters_proc_swaps;
+
+ if (!p->what) {
+ if (!(wp = strdup(what_proc_swaps))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ if (!m->swaps_by_proc_swaps)
+ if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) {
+ r = -ENOMEM;
+ 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));
+
+ if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 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;
+
+ } else {
+ p = &SWAP(u)->parameters_etc_fstab;
+
+ if (!(wp = strdup(what))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ free(p->what);
+ p->what = wp;
+
+ SWAP(u)->from_etc_fstab = true;
+ }
+
+ p->priority = priority;
+ p->noauto = noauto;
+ p->nofail = nofail;
+ p->handle = handle;
+
+ unit_add_to_dbus_queue(u);
+
+ free(e);
+
+ return 0;
+
+fail:
+ log_warning("Failed to load swap unit: %s", strerror(-r));
+
+ free(wp);
+ free(e);
+
+ 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 */
+
+ if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev)))
+ return -ENOMEM;
+
+ if ((dn = udev_device_get_devnode(d)))
+ r = swap_add_one(m, dn, device, prio, false, 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;
+
+ if ((k = swap_add_one(m, p, device, prio, false, false, false, set_flags)) < 0)
+ r = k;
+ }
+
+ udev_device_unref(d);
+ }
+
+ if ((k = swap_add_one(m, device, device, prio, false, false, false, set_flags)) < 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;
+
+ if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
+ return r;
+
+ if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 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 = &s->parameters_etc_fstab;
+
+ fprintf(f,
+ "%sSwap State: %s\n"
+ "%sResult: %s\n"
+ "%sWhat: %s\n"
+ "%sPriority: %i\n"
+ "%sNoAuto: %s\n"
+ "%sNoFail: %s\n"
+ "%sHandle: %s\n"
+ "%sFrom /etc/fstab: %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, p->priority,
+ prefix, yes_no(p->noauto),
+ prefix, yes_no(p->nofail),
+ prefix, yes_no(p->handle),
+ prefix, yes_no(s->from_etc_fstab),
+ prefix, yes_no(s->from_proc_swaps),
+ prefix, yes_no(s->from_fragment));
+
+ 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);
+}
+
+static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
+ pid_t pid;
+ int r;
+
+ assert(s);
+ assert(c);
+ assert(_pid);
+
+ if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
+ goto fail;
+
+ if ((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,
+ &pid)) < 0)
+ goto fail;
+
+ if ((r = unit_watch_pid(UNIT(s), pid)) < 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->exec_context.kill_mode != KILL_NONE) {
+ int sig = (state == SWAP_ACTIVATING_SIGTERM ||
+ state == SWAP_DEACTIVATING_SIGTERM) ? s->exec_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->exec_context.kill_mode == KILL_CONTROL_GROUP) {
+
+ if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ /* Exclude the control pid from being killed via the cgroup */
+ if (s->control_pid > 0)
+ if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
+ goto fail;
+
+ if ((r = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, sig, true, pid_set)) < 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) {
+ if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 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 if (s->from_etc_fstab)
+ priority = s->parameters_etc_fstab.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);
+
+ if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 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;
+
+ if ((r = exec_command_set(
+ s->control_command,
+ "/sbin/swapoff",
+ s->what,
+ NULL)) < 0)
+ goto fail;
+
+ swap_unwatch_control_pid(s);
+
+ if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 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);
+
+ 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);
+
+ 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;
+
+ if ((state = swap_state_from_string(value)) < 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;
+
+ if ((id = swap_exec_command_from_string(value)) < 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_etc_fstab || 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))
+ 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->exec_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->exec_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;
+
+ if ((k = fscanf(m->proc_swaps,
+ "%ms " /* device/file */
+ "%*s " /* type of swap */
+ "%*s " /* swap size */
+ "%*s " /* used */
+ "%i\n", /* priority */
+ &dev, &prio)) != 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);
+
+ if ((r = swap_load_proc_swaps(m, true)) < 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) {
+ if (!(m->proc_swaps = fopen("/proc/swaps", "re")))
+ 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;
+ }
+
+ /* We rely on mount.c to load /etc/fstab for us */
+
+ if ((r = swap_load_proc_swaps(m, false)) < 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, KillMode mode, 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 && mode == KILL_CONTROL_GROUP) {
+ int q;
+
+ if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
+ return -ENOMEM;
+
+ /* Exclude the control pid from being killed via the cgroup */
+ if (s->control_pid > 0)
+ if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
+ r = q;
+ goto finish;
+ }
+
+ if ((q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, pid_set)) < 0)
+ if (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 = {
+ .suffix = ".swap",
+ .object_size = sizeof(Swap),
+ .sections =
+ "Unit\0"
+ "Swap\0"
+ "Install\0",
+
+ .no_alias = true,
+ .no_instances = true,
+ .show_status = 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
+};