+++ /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 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 <unistd.h>
-#include <sys/epoll.h>
-#include <sys/stat.h>
-#include <libudev.h>
-
-#include "unit.h"
-#include "swap.h"
-#include "unit-name.h"
-#include "dbus-swap.h"
-#include "special.h"
-#include "exit-status.h"
-#include "path-util.h"
-#include "virt.h"
-#include "udev-util.h"
-#include "fstab-util.h"
-
-static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
- [SWAP_DEAD] = UNIT_INACTIVE,
- [SWAP_ACTIVATING] = UNIT_ACTIVATING,
- [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE,
- [SWAP_ACTIVE] = UNIT_ACTIVE,
- [SWAP_DEACTIVATING] = UNIT_DEACTIVATING,
- [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
- [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
- [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
- [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
- [SWAP_FAILED] = UNIT_FAILED
-};
-
-static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
-static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
-
-static void swap_unset_proc_swaps(Swap *s) {
- assert(s);
-
- if (!s->from_proc_swaps)
- return;
-
- free(s->parameters_proc_swaps.what);
- s->parameters_proc_swaps.what = NULL;
-
- s->from_proc_swaps = false;
-}
-
-static int swap_set_devnode(Swap *s, const char *devnode) {
- Hashmap *swaps;
- Swap *first;
- int r;
-
- assert(s);
-
- r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &string_hash_ops);
- if (r < 0)
- return r;
-
- swaps = UNIT(s)->manager->swaps_by_devnode;
-
- if (s->devnode) {
- first = hashmap_get(swaps, s->devnode);
-
- LIST_REMOVE(same_devnode, first, s);
- if (first)
- hashmap_replace(swaps, first->devnode, first);
- else
- hashmap_remove(swaps, s->devnode);
-
- free(s->devnode);
- s->devnode = NULL;
- }
-
- if (devnode) {
- s->devnode = strdup(devnode);
- if (!s->devnode)
- return -ENOMEM;
-
- first = hashmap_get(swaps, s->devnode);
- LIST_PREPEND(same_devnode, first, s);
-
- return hashmap_replace(swaps, first->devnode, first);
- }
-
- return 0;
-}
-
-static void swap_init(Unit *u) {
- Swap *s = SWAP(u);
-
- assert(s);
- assert(UNIT(s)->load_state == UNIT_STUB);
-
- s->timeout_usec = u->manager->default_timeout_start_usec;
-
- s->exec_context.std_output = u->manager->default_std_output;
- s->exec_context.std_error = u->manager->default_std_error;
-
- s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1;
-
- s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
-
- u->ignore_on_isolate = true;
-}
-
-static void swap_unwatch_control_pid(Swap *s) {
- assert(s);
-
- if (s->control_pid <= 0)
- return;
-
- unit_unwatch_pid(UNIT(s), s->control_pid);
- s->control_pid = 0;
-}
-
-static void swap_done(Unit *u) {
- Swap *s = SWAP(u);
-
- assert(s);
-
- swap_unset_proc_swaps(s);
- swap_set_devnode(s, NULL);
-
- free(s->what);
- s->what = NULL;
-
- free(s->parameters_fragment.what);
- s->parameters_fragment.what = NULL;
-
- free(s->parameters_fragment.options);
- s->parameters_fragment.options = NULL;
-
- s->exec_runtime = exec_runtime_unref(s->exec_runtime);
- exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
- s->control_command = NULL;
-
- swap_unwatch_control_pid(s);
-
- s->timer_event_source = sd_event_source_unref(s->timer_event_source);
-}
-
-static int swap_arm_timer(Swap *s) {
- int r;
-
- assert(s);
-
- if (s->timeout_usec <= 0) {
- s->timer_event_source = sd_event_source_unref(s->timer_event_source);
- return 0;
- }
-
- if (s->timer_event_source) {
- r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_usec);
- if (r < 0)
- return r;
-
- return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
- }
-
- return sd_event_add_time(
- UNIT(s)->manager->event,
- &s->timer_event_source,
- CLOCK_MONOTONIC,
- now(CLOCK_MONOTONIC) + s->timeout_usec, 0,
- swap_dispatch_timer, s);
-}
-
-static int swap_add_device_links(Swap *s) {
- assert(s);
-
- if (!s->what)
- return 0;
-
- if (!s->from_fragment)
- return 0;
-
- if (is_device_path(s->what))
- return unit_add_node_link(UNIT(s), s->what, 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) {
- assert(s);
-
- if (UNIT(s)->manager->running_as != SYSTEMD_SYSTEM)
- return 0;
-
- if (detect_container(NULL) > 0)
- return 0;
-
- return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
-}
-
-static int swap_verify(Swap *s) {
- bool b;
- _cleanup_free_ char *e = NULL;
-
- if (UNIT(s)->load_state != UNIT_LOADED)
- return 0;
-
- e = unit_name_from_path(s->what, ".swap");
- if (!e)
- return log_oom();
-
- b = unit_has_name(UNIT(s), e);
- if (!b) {
- log_unit_error(UNIT(s)->id, "%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_unit_error(UNIT(s)->id, "%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_devnode(Swap *s) {
- _cleanup_udev_device_unref_ struct udev_device *d = NULL;
- struct stat st;
- const char *p;
-
- assert(s);
-
- if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode))
- return 0;
-
- d = udev_device_new_from_devnum(UNIT(s)->manager->udev, 'b', st.st_rdev);
- if (!d)
- return 0;
-
- p = udev_device_get_devnode(d);
- if (!p)
- return 0;
-
- return swap_set_devnode(s, p);
-}
-
-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) {
-
- 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) {
- r = unit_set_description(u, s->what);
- if (r < 0)
- return r;
- }
-
- r = unit_require_mounts_for(UNIT(s), s->what);
- if (r < 0)
- return r;
-
- r = swap_add_device_links(s);
- if (r < 0)
- return r;
-
- r = swap_load_devnode(s);
- if (r < 0)
- return r;
-
- r = unit_patch_contexts(u);
- if (r < 0)
- return r;
-
- r = unit_add_exec_dependencies(u, &s->exec_context);
- if (r < 0)
- return r;
-
- r = unit_add_default_slice(u, &s->cgroup_context);
- if (r < 0)
- return r;
-
- if (UNIT(s)->default_dependencies) {
- r = swap_add_default_dependencies(s);
- if (r < 0)
- return r;
- }
- }
-
- return swap_verify(s);
-}
-
-static int swap_setup_unit(
- Manager *m,
- const char *what,
- const char *what_proc_swaps,
- int priority,
- bool set_flags) {
-
- _cleanup_free_ char *e = NULL;
- bool delete = false;
- Unit *u = NULL;
- int r;
- SwapParameters *p;
-
- assert(m);
- assert(what);
- assert(what_proc_swaps);
-
- 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)) {
- log_error("Swap %s appeared twice with different device paths %s and %s", e, 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 = -ENOMEM;
- goto fail;
- }
-
- unit_add_to_load_queue(u);
- } else
- delete = false;
-
- p = &SWAP(u)->parameters_proc_swaps;
-
- if (!p->what) {
- p->what = strdup(what_proc_swaps);
- if (!p->what) {
- r = -ENOMEM;
- goto fail;
- }
- }
-
- 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;
-
- unit_add_to_dbus_queue(u);
- return 0;
-
-fail:
- log_unit_warning_errno(e, r, "Failed to load swap unit: %m");
-
- if (delete && u)
- unit_free(u);
-
- return r;
-}
-
-static int swap_process_new(Manager *m, const char *device, int prio, bool set_flags) {
- _cleanup_udev_device_unref_ struct udev_device *d = NULL;
- struct udev_list_entry *item = NULL, *first = NULL;
- const char *dn;
- struct stat st;
- int r;
-
- assert(m);
-
- r = swap_setup_unit(m, device, device, prio, set_flags);
- if (r < 0)
- return r;
-
- /* If this is a block device, then let's add duplicates for
- * all other names of this block device */
- if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode))
- return 0;
-
- d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev);
- if (!d)
- return 0;
-
- /* Add the main device node */
- dn = udev_device_get_devnode(d);
- if (dn && !streq(dn, device))
- swap_setup_unit(m, dn, device, prio, 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 (streq(p, device))
- continue;
-
- 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;
-
- swap_setup_unit(m, p, device, prio, set_flags);
- }
-
- return r;
-}
-
-static void swap_set_state(Swap *s, SwapState state) {
- SwapState old_state;
- Swap *other;
-
- assert(s);
-
- old_state = s->state;
- s->state = state;
-
- if (state != SWAP_ACTIVATING &&
- state != SWAP_ACTIVATING_SIGTERM &&
- state != SWAP_ACTIVATING_SIGKILL &&
- state != SWAP_ACTIVATING_DONE &&
- state != SWAP_DEACTIVATING &&
- state != SWAP_DEACTIVATING_SIGTERM &&
- state != SWAP_DEACTIVATING_SIGKILL) {
- s->timer_event_source = sd_event_source_unref(s->timer_event_source);
- swap_unwatch_control_pid(s);
- s->control_command = NULL;
- s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
- }
-
- if (state != old_state)
- log_unit_debug(UNIT(s)->id,
- "%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);
-
- /* If there other units for the same device node have a job
- queued it might be worth checking again if it is runnable
- now. This is necessary, since swap_start() refuses
- operation with EAGAIN if there's already another job for
- the same device node queued. */
- LIST_FOREACH_OTHERS(same_devnode, other, s)
- if (UNIT(other)->job)
- job_add_to_run_queue(UNIT(other)->job);
-}
-
-static int swap_coldplug(Unit *u, Hashmap *deferred_work) {
- Swap *s = SWAP(u);
- SwapState new_state = SWAP_DEAD;
- int r;
-
- assert(s);
- assert(s->state == SWAP_DEAD);
-
- if (s->deserialized_state != s->state)
- new_state = s->deserialized_state;
- else if (s->from_proc_swaps)
- new_state = SWAP_ACTIVE;
-
- if (new_state == s->state)
- return 0;
-
- if (new_state == SWAP_ACTIVATING ||
- new_state == SWAP_ACTIVATING_SIGTERM ||
- new_state == SWAP_ACTIVATING_SIGKILL ||
- new_state == SWAP_ACTIVATING_DONE ||
- 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 = swap_arm_timer(s);
- 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 (s->devnode)
- fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode);
-
- if (p)
- fprintf(f,
- "%sPriority: %i\n"
- "%sOptions: %s\n",
- prefix, p->priority,
- prefix, strempty(p->options));
-
- if (s->control_pid > 0)
- fprintf(f,
- "%sControl PID: "PID_FMT"\n",
- prefix, s->control_pid);
-
- exec_context_dump(&s->exec_context, f, prefix);
- kill_context_dump(&s->kill_context, f, prefix);
-}
-
-static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
- pid_t pid;
- int r;
- ExecParameters exec_params = {
- .apply_permissions = true,
- .apply_chroot = true,
- .apply_tty_stdin = true,
- };
-
- assert(s);
- assert(c);
- assert(_pid);
-
- (void) unit_realize_cgroup(UNIT(s));
- if (s->reset_cpu_usage) {
- (void) unit_reset_cpu_usage(UNIT(s));
- s->reset_cpu_usage = false;
- }
-
- r = unit_setup_exec_runtime(UNIT(s));
- if (r < 0)
- goto fail;
-
- r = swap_arm_timer(s);
- if (r < 0)
- goto fail;
-
- exec_params.environment = UNIT(s)->manager->environment;
- exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn;
- exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported;
- exec_params.cgroup_path = UNIT(s)->cgroup_path;
- exec_params.cgroup_delegate = s->cgroup_context.delegate;
- exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager);
- exec_params.unit_id = UNIT(s)->id;
-
- r = exec_spawn(c,
- &s->exec_context,
- &exec_params,
- s->exec_runtime,
- &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:
- s->timer_event_source = sd_event_source_unref(s->timer_event_source);
- return r;
-}
-
-static void swap_enter_dead(Swap *s, SwapResult f) {
- assert(s);
-
- if (f != SWAP_SUCCESS)
- s->result = f;
-
- exec_runtime_destroy(s->exec_runtime);
- s->exec_runtime = exec_runtime_unref(s->exec_runtime);
-
- exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager));
-
- 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;
-
- assert(s);
-
- if (f != SWAP_SUCCESS)
- s->result = f;
-
- r = unit_kill_context(
- UNIT(s),
- &s->kill_context,
- (state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM) ?
- KILL_KILL : KILL_TERMINATE,
- -1,
- s->control_pid,
- false);
- if (r < 0)
- goto fail;
-
- if (r > 0) {
- r = swap_arm_timer(s);
- if (r < 0)
- goto fail;
-
- swap_set_state(s, state);
- } else if (state == SWAP_ACTIVATING_SIGTERM)
- swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_SUCCESS);
- else if (state == SWAP_DEACTIVATING_SIGTERM)
- swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS);
- else
- swap_enter_dead(s, SWAP_SUCCESS);
-
- return;
-
-fail:
- log_unit_warning_errno(UNIT(s)->id, r, "%s failed to kill processes: %m", UNIT(s)->id);
- swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
-}
-
-static void swap_enter_activating(Swap *s) {
- _cleanup_free_ char *discard = NULL;
- int r, priority = -1;
-
- assert(s);
-
- s->control_command_id = SWAP_EXEC_ACTIVATE;
- s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
-
- if (s->from_fragment) {
- fstab_filter_options(s->parameters_fragment.options, "discard\0",
- NULL, &discard, NULL);
-
- priority = s->parameters_fragment.priority;
- if (priority < 0) {
- r = fstab_find_pri(s->parameters_fragment.options, &priority);
- if (r < 0)
- log_notice_errno(r, "Failed to parse swap priority \"%s\", ignoring: %m",
- s->parameters_fragment.options);
- }
- }
-
- r = exec_command_set(s->control_command, "/sbin/swapon", NULL);
- if (r < 0)
- goto fail;
-
- if (priority >= 0) {
- char p[DECIMAL_STR_MAX(int)];
-
- sprintf(p, "%i", priority);
- r = exec_command_append(s->control_command, "-p", p, NULL);
- if (r < 0)
- goto fail;
- }
-
- if (discard && !streq(discard, "none")) {
- const char *discard_arg;
-
- if (streq(discard, "all"))
- discard_arg = "--discard";
- else
- discard_arg = strjoina("--discard=", discard);
-
- r = exec_command_append(s->control_command, discard_arg, NULL);
- if (r < 0)
- goto fail;
- }
-
- r = exec_command_append(s->control_command, s->what, NULL);
- if (r < 0)
- goto fail;
-
- swap_unwatch_control_pid(s);
-
- r = swap_spawn(s, s->control_command, &s->control_pid);
- if (r < 0)
- goto fail;
-
- swap_set_state(s, SWAP_ACTIVATING);
-
- return;
-
-fail:
- log_unit_warning_errno(UNIT(s)->id, r, "%s failed to run 'swapon' task: %m", UNIT(s)->id);
- 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_unit_warning_errno(UNIT(s)->id, r, "%s failed to run 'swapoff' task: %m", UNIT(s)->id);
- swap_enter_active(s, SWAP_FAILURE_RESOURCES);
-}
-
-static int swap_start(Unit *u) {
- Swap *s = SWAP(u), *other;
-
- 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;
-
- /* If there's a job for another swap unit for the same node
- * running, then let's not dispatch this one for now, and wait
- * until that other job has finished. */
- LIST_FOREACH_OTHERS(same_devnode, other, s)
- if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING)
- return -EAGAIN;
-
- s->result = SWAP_SUCCESS;
- s->reset_cpu_usage = true;
-
- swap_enter_activating(s);
- return 1;
-}
-
-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_ACTIVATING_DONE ||
- s->state == SWAP_ACTIVE);
-
- if (detect_container(NULL) > 0)
- return -EPERM;
-
- swap_enter_deactivating(s);
- return 1;
-}
-
-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", PID_FMT, 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_unit_debug(u->id, "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_unit_debug(u->id, "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_unit_debug(u->id, "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_unit_debug(u->id, "Failed to parse exec-command value %s", value);
- else {
- s->control_command_id = id;
- s->control_command = s->exec_command + id;
- }
- } else
- log_unit_debug(u->id, "Unknown serialization key '%s'", key);
-
- return 0;
-}
-
-_pure_ static UnitActiveState swap_active_state(Unit *u) {
- assert(u);
-
- return state_translation_table[SWAP(u)->state];
-}
-
-_pure_ static const char *swap_sub_state_to_string(Unit *u) {
- assert(u);
-
- return swap_state_to_string(SWAP(u)->state);
-}
-
-_pure_ static bool swap_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_unit_full(u->id,
- 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_DONE:
- 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:
-
- 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);
-}
-
-static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
- Swap *s = SWAP(userdata);
-
- assert(s);
- assert(s->timer_event_source == source);
-
- switch (s->state) {
-
- case SWAP_ACTIVATING:
- case SWAP_ACTIVATING_DONE:
- log_unit_warning(UNIT(s)->id, "%s activation timed out. Stopping.", UNIT(s)->id);
- swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
- break;
-
- case SWAP_DEACTIVATING:
- log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Stopping.", UNIT(s)->id);
- swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
- break;
-
- case SWAP_ACTIVATING_SIGTERM:
- if (s->kill_context.send_sigkill) {
- log_unit_warning(UNIT(s)->id, "%s activation timed out. Killing.", UNIT(s)->id);
- swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
- } else {
- log_unit_warning(UNIT(s)->id, "%s activation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
- swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
- }
- break;
-
- case SWAP_DEACTIVATING_SIGTERM:
- if (s->kill_context.send_sigkill) {
- log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Killing.", UNIT(s)->id);
- swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
- } else {
- log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
- swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
- }
- break;
-
- case SWAP_ACTIVATING_SIGKILL:
- case SWAP_DEACTIVATING_SIGKILL:
- log_unit_warning(UNIT(s)->id, "%s swap process still around after SIGKILL. Ignoring.", UNIT(s)->id);
- swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
- break;
-
- default:
- assert_not_reached("Timeout at wrong time.");
- }
-
- return 0;
-}
-
-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++) {
- _cleanup_free_ char *dev = NULL, *d = NULL;
- 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);
- continue;
- }
-
- d = cunescape(dev);
- if (!d)
- return log_oom();
-
- device_found_node(m, d, true, DEVICE_FOUND_SWAP, set_flags);
-
- k = swap_process_new(m, d, prio, set_flags);
- if (k < 0)
- r = k;
- }
-
- return r;
-}
-
-static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
- Manager *m = userdata;
- Unit *u;
- int r;
-
- assert(m);
- assert(revents & EPOLLPRI);
-
- r = swap_load_proc_swaps(m, true);
- if (r < 0) {
- log_error_errno(r, "Failed to reread /proc/swaps: %m");
-
- /* 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_unset_proc_swaps(swap);
-
- switch (swap->state) {
-
- case SWAP_ACTIVE:
- swap_enter_dead(swap, SWAP_SUCCESS);
- break;
-
- default:
- /* Fire again */
- swap_set_state(swap, swap->state);
- break;
- }
-
- if (swap->what)
- device_found_node(m, swap->what, false, DEVICE_FOUND_SWAP, true);
-
- } else if (swap->just_activated) {
-
- /* New swap entry */
-
- switch (swap->state) {
-
- case SWAP_DEAD:
- case SWAP_FAILED:
- swap_enter_active(swap, SWAP_SUCCESS);
- break;
-
- case SWAP_ACTIVATING:
- swap_set_state(swap, SWAP_ACTIVATING_DONE);
- 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 the user configured the swap through /etc/fstab or
- * a device unit, follow that. */
-
- if (s->from_fragment)
- return NULL;
-
- LIST_FOREACH_OTHERS(same_devnode, other, s)
- if (other->from_fragment)
- return UNIT(other);
-
- /* Otherwise make everybody follow the unit that's named after
- * the swap device in the kernel */
-
- if (streq_ptr(s->what, s->devnode))
- return NULL;
-
- LIST_FOREACH_AFTER(same_devnode, other, s)
- if (streq_ptr(other->what, other->devnode))
- return UNIT(other);
-
- LIST_FOREACH_BEFORE(same_devnode, other, s) {
- if (streq_ptr(other->what, other->devnode))
- return UNIT(other);
-
- first = other;
- }
-
- /* Fall back to the first on the list */
- return UNIT(first);
-}
-
-static int swap_following_set(Unit *u, Set **_set) {
- Swap *s = SWAP(u), *other;
- Set *set;
- int r;
-
- assert(s);
- assert(_set);
-
- if (LIST_JUST_US(same_devnode, s)) {
- *_set = NULL;
- return 0;
- }
-
- set = set_new(NULL);
- if (!set)
- return -ENOMEM;
-
- LIST_FOREACH_OTHERS(same_devnode, other, s) {
- r = set_put(set, other);
- if (r < 0)
- goto fail;
- }
-
- *_set = set;
- return 1;
-
-fail:
- set_free(set);
- return r;
-}
-
-static void swap_shutdown(Manager *m) {
- assert(m);
-
- m->swap_event_source = sd_event_source_unref(m->swap_event_source);
-
- if (m->proc_swaps) {
- fclose(m->proc_swaps);
- m->proc_swaps = NULL;
- }
-
- hashmap_free(m->swaps_by_devnode);
- m->swaps_by_devnode = NULL;
-}
-
-static int swap_enumerate(Manager *m) {
- int r;
-
- assert(m);
-
- if (!m->proc_swaps) {
- m->proc_swaps = fopen("/proc/swaps", "re");
- if (!m->proc_swaps)
- return errno == ENOENT ? 0 : -errno;
-
- r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m);
- if (r < 0)
- goto fail;
-
- /* Dispatch this before we dispatch SIGCHLD, so that
- * we always get the events from /proc/swaps before
- * the SIGCHLD of /sbin/swapon. */
- r = sd_event_source_set_priority(m->swap_event_source, -10);
- if (r < 0)
- goto fail;
- }
-
- r = swap_load_proc_swaps(m, false);
- if (r < 0)
- goto fail;
-
- return 0;
-
-fail:
- swap_shutdown(m);
- return r;
-}
-
-int swap_process_device_new(Manager *m, struct udev_device *dev) {
- struct udev_list_entry *item = NULL, *first = NULL;
- _cleanup_free_ char *e = NULL;
- const char *dn;
- Swap *s;
- int r = 0;
-
- assert(m);
- assert(dev);
-
- dn = udev_device_get_devnode(dev);
- if (!dn)
- return 0;
-
- e = unit_name_from_path(dn, ".swap");
- if (!e)
- return -ENOMEM;
-
- s = hashmap_get(m->units, e);
- if (s)
- r = swap_set_devnode(s, dn);
-
- first = udev_device_get_devlinks_list_entry(dev);
- udev_list_entry_foreach(item, first) {
- _cleanup_free_ char *n = NULL;
-
- n = unit_name_from_path(udev_list_entry_get_name(item), ".swap");
- if (!n)
- return -ENOMEM;
-
- s = hashmap_get(m->units, n);
- if (s) {
- int q;
-
- q = swap_set_devnode(s, dn);
- if (q < 0)
- r = q;
- }
- }
-
- return r;
-}
-
-int swap_process_device_remove(Manager *m, struct udev_device *dev) {
- const char *dn;
- int r = 0;
- Swap *s;
-
- dn = udev_device_get_devnode(dev);
- if (!dn)
- return 0;
-
- while ((s = hashmap_get(m->swaps_by_devnode, dn))) {
- int q;
-
- q = swap_set_devnode(s, NULL);
- if (q < 0)
- r = q;
- }
-
- 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, sd_bus_error *error) {
- return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error);
-}
-
-static int swap_get_timeout(Unit *u, uint64_t *timeout) {
- Swap *s = SWAP(u);
- int r;
-
- if (!s->timer_event_source)
- return 0;
-
- r = sd_event_source_get_time(s->timer_event_source, timeout);
- if (r < 0)
- return r;
-
- return 1;
-}
-
-static bool swap_supported(Manager *m) {
- static int supported = -1;
-
- /* If swap support is not available in the kernel, or we are
- * running in a container we don't support swap units, and any
- * attempts to starting one should fail immediately. */
-
- if (supported < 0)
- supported =
- access("/proc/swaps", F_OK) >= 0 &&
- detect_container(NULL) <= 0;
-
- return supported;
-}
-
-static const char* const swap_state_table[_SWAP_STATE_MAX] = {
- [SWAP_DEAD] = "dead",
- [SWAP_ACTIVATING] = "activating",
- [SWAP_ACTIVATING_DONE] = "activating-done",
- [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),
- .cgroup_context_offset = offsetof(Swap, cgroup_context),
- .kill_context_offset = offsetof(Swap, kill_context),
- .exec_runtime_offset = offsetof(Swap, exec_runtime),
-
- .sections =
- "Unit\0"
- "Swap\0"
- "Install\0",
- .private_section = "Swap",
-
- .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,
-
- .get_timeout = swap_get_timeout,
-
- .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,
-
- .reset_failed = swap_reset_failed,
-
- .bus_interface = "org.freedesktop.systemd1.Swap",
- .bus_vtable = bus_swap_vtable,
- .bus_set_property = bus_swap_set_property,
- .bus_commit_properties = bus_swap_commit_properties,
-
- .following = swap_following,
- .following_set = swap_following_set,
-
- .enumerate = swap_enumerate,
- .shutdown = swap_shutdown,
- .supported = swap_supported,
-
- .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.",
- },
- },
-};
~ianmdlvl / elogind.git / blobdiff