diff options
Diffstat (limited to 'src/core/swap.c')
| -rw-r--r-- | src/core/swap.c | 1546 |
1 files changed, 0 insertions, 1546 deletions
diff --git a/src/core/swap.c b/src/core/swap.c deleted file mode 100644 index 2228a254bb..0000000000 --- a/src/core/swap.c +++ /dev/null @@ -1,1546 +0,0 @@ -/*** - 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 <sys/epoll.h> -#include <sys/stat.h> -#include <unistd.h> - -#include "libudev.h" - -#include "alloc-util.h" -#include "dbus-swap.h" -#include "escape.h" -#include "exit-status.h" -#include "fd-util.h" -#include "formats-util.h" -#include "fstab-util.h" -#include "parse-util.h" -#include "path-util.h" -#include "process-util.h" -#include "special.h" -#include "string-table.h" -#include "string-util.h" -#include "swap.h" -#include "udev-util.h" -#include "unit-name.h" -#include "unit.h" -#include "virt.h" - -static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { - [SWAP_DEAD] = UNIT_INACTIVE, - [SWAP_ACTIVATING] = UNIT_ACTIVATING, - [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE, - [SWAP_ACTIVE] = UNIT_ACTIVE, - [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, - [SWAP_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; - - s->parameters_proc_swaps.what = mfree(s->parameters_proc_swaps.what); - - s->from_proc_swaps = false; -} - -static int swap_set_devnode(Swap *s, const char *devnode) { - Hashmap *swaps; - Swap *first; - int r; - - assert(s); - - r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &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); - - s->devnode = mfree(s->devnode); - } - - if (devnode) { - s->devnode = strdup(devnode); - if (!s->devnode) - return -ENOMEM; - - first = hashmap_get(swaps, s->devnode); - LIST_PREPEND(same_devnode, first, s); - - return hashmap_replace(swaps, first->devnode, first); - } - - return 0; -} - -static void swap_init(Unit *u) { - Swap *s = SWAP(u); - - assert(s); - assert(UNIT(s)->load_state == UNIT_STUB); - - s->timeout_usec = u->manager->default_timeout_start_usec; - - s->exec_context.std_output = u->manager->default_std_output; - s->exec_context.std_error = u->manager->default_std_error; - - s->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); - - s->what = mfree(s->what); - s->parameters_fragment.what = mfree(s->parameters_fragment.what); - s->parameters_fragment.options = mfree(s->parameters_fragment.options); - - s->exec_runtime = exec_runtime_unref(s->exec_runtime); - exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); - s->control_command = NULL; - - dynamic_creds_unref(&s->dynamic_creds); - - swap_unwatch_control_pid(s); - - s->timer_event_source = sd_event_source_unref(s->timer_event_source); -} - -static int swap_arm_timer(Swap *s, usec_t usec) { - int r; - - assert(s); - - if (s->timer_event_source) { - r = sd_event_source_set_time(s->timer_event_source, usec); - if (r < 0) - return r; - - return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); - } - - if (usec == USEC_INFINITY) - return 0; - - r = sd_event_add_time( - UNIT(s)->manager->event, - &s->timer_event_source, - CLOCK_MONOTONIC, - usec, 0, - swap_dispatch_timer, s); - if (r < 0) - return r; - - (void) sd_event_source_set_description(s->timer_event_source, "swap-timer"); - - return 0; -} - -static 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, MANAGER_IS_SYSTEM(UNIT(s)->manager), UNIT_BINDS_TO); - else - /* File based swap devices need to be ordered after - * systemd-remount-fs.service, since they might need a - * writable file system. */ - return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true); -} - -static int swap_add_default_dependencies(Swap *s) { - int r; - - assert(s); - - if (!UNIT(s)->default_dependencies) - return 0; - - if (!MANAGER_IS_SYSTEM(UNIT(s)->manager)) - return 0; - - if (detect_container() > 0) - return 0; - - /* swap units generated for the swap dev links are missing the - * ordering dep against the swap target. */ - r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SWAP_TARGET, NULL, true); - if (r < 0) - return r; - - return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); -} - -static int swap_verify(Swap *s) { - _cleanup_free_ char *e = NULL; - int r; - - if (UNIT(s)->load_state != UNIT_LOADED) - return 0; - - r = unit_name_from_path(s->what, ".swap", &e); - if (r < 0) - return log_unit_error_errno(UNIT(s), r, "Failed to generate unit name from path: %m"); - - if (!unit_has_name(UNIT(s), e)) { - log_unit_error(UNIT(s), "Value of What= and unit name do not match, not loading."); - return -EINVAL; - } - - if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) { - log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load."); - 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 { - r = unit_name_to_path(u->id, &s->what); - if (r < 0) - return r; - } - - 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_set_default_slice(u); - if (r < 0) - return r; - - 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); - - r = unit_name_from_path(what, ".swap", &e); - if (r < 0) - return log_unit_error_errno(u, r, "Failed to generate unit name from path: %m"); - - u = manager_get_unit(m, e); - - if (u && - SWAP(u)->from_proc_swaps && - !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) { - 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; - - r = unit_new_for_name(m, sizeof(Swap), e, &u); - if (r < 0) - goto fail; - - SWAP(u)->what = strdup(what); - if (!SWAP(u)->what) { - r = -ENOMEM; - goto fail; - } - - unit_add_to_load_queue(u); - } else - delete = false; - - p = &SWAP(u)->parameters_proc_swaps; - - if (!p->what) { - p->what = strdup(what_proc_swaps); - if (!p->what) { - r = -ENOMEM; - goto fail; - } - } - - 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(u, 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), "Changed %s -> %s", swap_state_to_string(old_state), swap_state_to_string(state)); - - unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 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) { - Swap *s = SWAP(u); - SwapState new_state = SWAP_DEAD; - int r; - - assert(s); - assert(s->state == SWAP_DEAD); - - if (s->deserialized_state != s->state) - new_state = s->deserialized_state; - else if (s->from_proc_swaps) - new_state = SWAP_ACTIVE; - - if (new_state == s->state) - return 0; - - if (s->control_pid > 0 && - pid_is_unwaited(s->control_pid) && - IN_SET(new_state, - SWAP_ACTIVATING, - SWAP_ACTIVATING_SIGTERM, - SWAP_ACTIVATING_SIGKILL, - SWAP_ACTIVATING_DONE, - SWAP_DEACTIVATING, - SWAP_DEACTIVATING_SIGTERM, - SWAP_DEACTIVATING_SIGKILL)) { - - r = unit_watch_pid(UNIT(s), s->control_pid); - if (r < 0) - return r; - - r = swap_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec)); - if (r < 0) - return r; - } - - if (!IN_SET(new_state, SWAP_DEAD, SWAP_FAILED)) - (void) unit_setup_dynamic_creds(u); - - 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 = { - .flags = EXEC_APPLY_PERMISSIONS|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN, - .stdin_fd = -1, - .stdout_fd = -1, - .stderr_fd = -1, - }; - - 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 = unit_setup_dynamic_creds(UNIT(s)); - if (r < 0) - return r; - - r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec)); - if (r < 0) - goto fail; - - exec_params.environment = UNIT(s)->manager->environment; - exec_params.flags |= UNIT(s)->manager->confirm_spawn ? EXEC_CONFIRM_SPAWN : 0; - 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); - - r = exec_spawn(UNIT(s), - c, - &s->exec_context, - &exec_params, - s->exec_runtime, - &s->dynamic_creds, - &pid); - if (r < 0) - goto fail; - - r = unit_watch_pid(UNIT(s), pid); - 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 (s->result == SWAP_SUCCESS) - s->result = f; - - swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); - - 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)); - - unit_unref_uid_gid(UNIT(s), true); - - dynamic_creds_destroy(&s->dynamic_creds); -} - -static void swap_enter_active(Swap *s, SwapResult f) { - assert(s); - - if (s->result == SWAP_SUCCESS) - s->result = f; - - swap_set_state(s, SWAP_ACTIVE); -} - -static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { - int r; - - assert(s); - - if (s->result == SWAP_SUCCESS) - s->result = f; - - r = unit_kill_context( - UNIT(s), - &s->kill_context, - (state != 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, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec)); - 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), r, "Failed to kill processes: %m"); - swap_enter_dead(s, SWAP_FAILURE_RESOURCES); -} - -static void swap_enter_activating(Swap *s) { - _cleanup_free_ char *opts = NULL; - int r; - - assert(s); - - s->control_command_id = SWAP_EXEC_ACTIVATE; - s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; - - if (s->from_fragment) { - int priority = -1; - - r = fstab_find_pri(s->parameters_fragment.options, &priority); - if (r < 0) - log_warning_errno(r, "Failed to parse swap priority \"%s\", ignoring: %m", s->parameters_fragment.options); - else if (r == 1 && s->parameters_fragment.priority >= 0) - log_warning("Duplicate swap priority configuration by Priority and Options fields."); - - if (r <= 0 && s->parameters_fragment.priority >= 0) { - if (s->parameters_fragment.options) - r = asprintf(&opts, "%s,pri=%i", s->parameters_fragment.options, s->parameters_fragment.priority); - else - r = asprintf(&opts, "pri=%i", s->parameters_fragment.priority); - if (r < 0) - goto fail; - } - } - - r = exec_command_set(s->control_command, "/sbin/swapon", NULL); - if (r < 0) - goto fail; - - if (s->parameters_fragment.options || opts) { - r = exec_command_append(s->control_command, "-o", - opts ? : s->parameters_fragment.options, NULL); - if (r < 0) - goto fail; - } - - r = exec_command_append(s->control_command, s->what, NULL); - if (r < 0) - goto fail; - - swap_unwatch_control_pid(s); - - r = swap_spawn(s, s->control_command, &s->control_pid); - if (r < 0) - goto fail; - - swap_set_state(s, SWAP_ACTIVATING); - - return; - -fail: - log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapon' task: %m"); - swap_enter_dead(s, SWAP_FAILURE_RESOURCES); -} - -static void swap_enter_deactivating(Swap *s) { - int r; - - assert(s); - - s->control_command_id = SWAP_EXEC_DEACTIVATE; - s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; - - r = exec_command_set(s->control_command, - "/sbin/swapoff", - s->what, - NULL); - if (r < 0) - goto fail; - - swap_unwatch_control_pid(s); - - r = swap_spawn(s, s->control_command, &s->control_pid); - if (r < 0) - goto fail; - - swap_set_state(s, SWAP_DEACTIVATING); - - return; - -fail: - log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapoff' task: %m"); - swap_enter_active(s, SWAP_FAILURE_RESOURCES); -} - -static int swap_start(Unit *u) { - Swap *s = SWAP(u), *other; - int r; - - assert(s); - - /* We cannot fulfill this request right now, try again later - * please! */ - - if (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() > 0) - return -EPERM; - - /* If there's a job for another swap unit for the same node - * running, then let's not dispatch this one for now, and wait - * until that other job has finished. */ - LIST_FOREACH_OTHERS(same_devnode, other, s) - if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING) - return -EAGAIN; - - r = unit_start_limit_test(u); - if (r < 0) { - swap_enter_dead(s, SWAP_FAILURE_START_LIMIT_HIT); - return r; - } - - r = unit_acquire_invocation_id(u); - if (r < 0) - return r; - - 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() > 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, "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, "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, "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, "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, "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, EXIT_CLEAN_COMMAND, 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 (s->result == 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, f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, - "Swap process exited, code=%s status=%i", 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), "Activation timed out. Stopping."); - swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); - break; - - case SWAP_DEACTIVATING: - log_unit_warning(UNIT(s), "Deactivation timed out. Stopping."); - 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), "Activation timed out. Killing."); - swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); - } else { - log_unit_warning(UNIT(s), "Activation timed out. Skipping SIGKILL. Ignoring."); - swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); - } - break; - - case SWAP_DEACTIVATING_SIGTERM: - if (s->kill_context.send_sigkill) { - log_unit_warning(UNIT(s), "Deactivation timed out. Killing."); - swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); - } else { - log_unit_warning(UNIT(s), "Deactivation timed out. Skipping SIGKILL. Ignoring."); - swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); - } - break; - - case SWAP_ACTIVATING_SIGKILL: - case SWAP_DEACTIVATING_SIGKILL: - log_unit_warning(UNIT(s), "Swap process still around after SIGKILL. Ignoring."); - 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; - } - - if (cunescape(dev, UNESCAPE_RELAX, &d) < 0) - 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: - (void) unit_acquire_invocation_id(UNIT(swap)); - 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); - - m->proc_swaps = safe_fclose(m->proc_swaps); - - m->swaps_by_devnode = hashmap_free(m->swaps_by_devnode); -} - -static void swap_enumerate(Manager *m) { - int r; - - assert(m); - - if (!m->proc_swaps) { - m->proc_swaps = fopen("/proc/swaps", "re"); - if (!m->proc_swaps) { - if (errno == ENOENT) - log_debug("Not swap enabled, skipping enumeration"); - else - log_error_errno(errno, "Failed to open /proc/swaps: %m"); - - return; - } - - r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m); - if (r < 0) { - log_error_errno(r, "Failed to watch /proc/swaps: %m"); - 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) { - log_error_errno(r, "Failed to change /proc/swaps priority: %m"); - goto fail; - } - - (void) sd_event_source_set_description(m->swap_event_source, "swap-proc"); - } - - r = swap_load_proc_swaps(m, false); - if (r < 0) - goto fail; - - return; - -fail: - swap_shutdown(m); -} - -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; - - r = unit_name_from_path(dn, ".swap", &e); - if (r < 0) - return r; - - 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; - int q; - - q = unit_name_from_path(udev_list_entry_get_name(item), ".swap", &n); - if (q < 0) - return q; - - s = hashmap_get(m->units, n); - if (s) { - 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, usec_t *timeout) { - Swap *s = SWAP(u); - usec_t t; - int r; - - if (!s->timer_event_source) - return 0; - - r = sd_event_source_get_time(s->timer_event_source, &t); - if (r < 0) - return r; - if (t == USEC_INFINITY) - return 0; - - *timeout = t; - return 1; -} - -static bool swap_supported(void) { - 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() <= 0; - - return supported; -} - -static int swap_control_pid(Unit *u) { - Swap *s = SWAP(u); - - assert(s); - - return s->control_pid; -} - -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", - [SWAP_FAILURE_START_LIMIT_HIT] = "start-limit-hit", -}; - -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), - .dynamic_creds_offset = offsetof(Swap, dynamic_creds), - - .sections = - "Unit\0" - "Swap\0" - "Install\0", - .private_section = "Swap", - - .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, - - .control_pid = swap_control_pid, - - .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_TIMEOUT] = "Timed out activating swap %s.", - }, - .finished_stop_job = { - [JOB_DONE] = "Deactivated swap %s.", - [JOB_FAILED] = "Failed deactivating swap %s.", - [JOB_TIMEOUT] = "Timed out deactivating swap %s.", - }, - }, -}; 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