+++ /dev/null
-/*-*- 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
-};
~ianmdlvl / elogind.git / blobdiff