| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <errno.h> |
| #include <sys/epoll.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| |
| #include "sd-device.h" |
| |
| #include "alloc-util.h" |
| #include "dbus-swap.h" |
| #include "dbus-unit.h" |
| #include "device-util.h" |
| #include "device.h" |
| #include "escape.h" |
| #include "exit-status.h" |
| #include "fd-util.h" |
| #include "format-util.h" |
| #include "fstab-util.h" |
| #include "parse-util.h" |
| #include "path-util.h" |
| #include "process-util.h" |
| #include "serialize.h" |
| #include "special.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "swap.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_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, |
| [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, |
| [SWAP_FAILED] = UNIT_FAILED, |
| [SWAP_CLEANING] = UNIT_MAINTENANCE, |
| }; |
| |
| 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 int swap_process_proc_swaps(Manager *m); |
| |
| static bool SWAP_STATE_WITH_PROCESS(SwapState state) { |
| return IN_SET(state, |
| SWAP_ACTIVATING, |
| SWAP_ACTIVATING_DONE, |
| SWAP_DEACTIVATING, |
| SWAP_DEACTIVATING_SIGTERM, |
| SWAP_DEACTIVATING_SIGKILL, |
| SWAP_CLEANING); |
| } |
| |
| _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_may_gc(Unit *u) { |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| |
| if (s->from_proc_swaps) |
| return false; |
| |
| return true; |
| } |
| |
| _pure_ static bool swap_is_extrinsic(Unit *u) { |
| assert(SWAP(u)); |
| |
| return MANAGER_IS_USER(u->manager); |
| } |
| |
| 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, &path_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->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), TAKE_PID(s->control_pid)); |
| } |
| |
| 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, false); |
| 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_disable_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 SwapParameters* swap_get_parameters(Swap *s) { |
| assert(s); |
| |
| if (s->from_proc_swaps) |
| return &s->parameters_proc_swaps; |
| |
| if (s->from_fragment) |
| return &s->parameters_fragment; |
| |
| return NULL; |
| } |
| |
| static int swap_add_device_dependencies(Swap *s) { |
| UnitDependencyMask mask; |
| SwapParameters *p; |
| int r; |
| |
| assert(s); |
| |
| if (!s->what) |
| return 0; |
| |
| p = swap_get_parameters(s); |
| if (!p || !p->what) |
| return 0; |
| |
| mask = s->from_proc_swaps ? UNIT_DEPENDENCY_PROC_SWAP : UNIT_DEPENDENCY_FILE; |
| |
| if (is_device_path(p->what)) { |
| r = unit_add_node_dependency(UNIT(s), p->what, UNIT_REQUIRES, mask); |
| if (r < 0) |
| return r; |
| |
| return unit_add_blockdev_dependency(UNIT(s), p->what, mask); |
| } |
| |
| /* 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, true, mask); |
| } |
| |
| 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, true, UNIT_DEPENDENCY_DEFAULT); |
| if (r < 0) |
| return r; |
| |
| return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
| } |
| |
| static int swap_verify(Swap *s) { |
| _cleanup_free_ char *e = NULL; |
| int r; |
| |
| assert(UNIT(s)->load_state == UNIT_LOADED); |
| |
| 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)) |
| return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Value of What= and unit name do not match, not loading."); |
| |
| if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) |
| return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load."); |
| |
| return 0; |
| } |
| |
| static int swap_load_devnode(Swap *s) { |
| _cleanup_free_ char *p = NULL; |
| struct stat st; |
| int r; |
| |
| assert(s); |
| |
| if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode)) |
| return 0; |
| |
| r = devname_from_stat_rdev(&st, &p); |
| if (r < 0) { |
| log_unit_full_errno(UNIT(s), r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r, |
| "Failed to get device node for swap %s: %m", s->what); |
| return 0; |
| } |
| |
| return swap_set_devnode(s, p); |
| } |
| |
| static int swap_add_extras(Swap *s) { |
| int r; |
| |
| assert(s); |
| |
| 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(UNIT(s)->id, &s->what); |
| if (r < 0) |
| return r; |
| } |
| |
| if (!s->what) |
| return -ENOMEM; |
| } |
| |
| path_simplify(s->what); |
| |
| if (!UNIT(s)->description) { |
| r = unit_set_description(UNIT(s), s->what); |
| if (r < 0) |
| return r; |
| } |
| |
| r = unit_require_mounts_for(UNIT(s), s->what, UNIT_DEPENDENCY_IMPLICIT); |
| if (r < 0) |
| return r; |
| |
| r = swap_add_device_dependencies(s); |
| if (r < 0) |
| return r; |
| |
| r = swap_load_devnode(s); |
| if (r < 0) |
| return r; |
| |
| r = unit_patch_contexts(UNIT(s)); |
| if (r < 0) |
| return r; |
| |
| r = unit_add_exec_dependencies(UNIT(s), &s->exec_context); |
| if (r < 0) |
| return r; |
| |
| r = unit_set_default_slice(UNIT(s)); |
| if (r < 0) |
| return r; |
| |
| r = swap_add_default_dependencies(s); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| static int swap_load(Unit *u) { |
| Swap *s = SWAP(u); |
| int r, q = 0; |
| |
| assert(s); |
| assert(u->load_state == UNIT_STUB); |
| |
| /* Load a .swap file */ |
| bool fragment_optional = s->from_proc_swaps; |
| r = unit_load_fragment_and_dropin(u, !fragment_optional); |
| |
| /* Add in some extras, and do so either when we successfully loaded something or when /proc/swaps is |
| * already active. */ |
| if (u->load_state == UNIT_LOADED || s->from_proc_swaps) |
| q = swap_add_extras(s); |
| |
| if (r < 0) |
| return r; |
| if (q < 0) |
| return q; |
| if (u->load_state != UNIT_LOADED) |
| return 0; |
| |
| 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)) |
| return log_error_errno(SYNTHETIC_ERRNO(EEXIST), |
| "Swap %s appeared twice with different device paths %s and %s", |
| e, SWAP(u)->parameters_proc_swaps.what, what_proc_swaps); |
| |
| 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; |
| } |
| } |
| |
| /* The unit is definitely around now, mark it as loaded if it was previously referenced but could not be |
| * loaded. After all we can load it now, from the data in /proc/swaps. */ |
| if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) { |
| u->load_state = UNIT_LOADED; |
| u->load_error = 0; |
| } |
| |
| if (set_flags) { |
| SWAP(u)->is_active = true; |
| SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; |
| } |
| |
| SWAP(u)->from_proc_swaps = true; |
| |
| p->priority = priority; |
| p->priority_set = true; |
| |
| unit_add_to_dbus_queue(u); |
| return 0; |
| |
| fail: |
| log_unit_warning_errno(u, r, "Failed to load swap unit: %m"); |
| |
| if (delete) |
| unit_free(u); |
| |
| return r; |
| } |
| |
| static void swap_process_new(Manager *m, const char *device, int prio, bool set_flags) { |
| _cleanup_(sd_device_unrefp) sd_device *d = NULL; |
| const char *dn, *devlink; |
| struct stat st, st_link; |
| int r; |
| |
| assert(m); |
| |
| if (swap_setup_unit(m, device, device, prio, set_flags) < 0) |
| return; |
| |
| /* 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; |
| |
| r = sd_device_new_from_stat_rdev(&d, &st); |
| if (r < 0) |
| return (void) log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r, |
| "Failed to allocate device for swap %s: %m", device); |
| |
| /* Add the main device node */ |
| if (sd_device_get_devname(d, &dn) >= 0 && !streq(dn, device)) |
| (void) swap_setup_unit(m, dn, device, prio, set_flags); |
| |
| /* Add additional units for all symlinks */ |
| FOREACH_DEVICE_DEVLINK(d, devlink) { |
| |
| /* Don't bother with the /dev/block links */ |
| if (streq(devlink, device)) |
| continue; |
| |
| if (path_startswith(devlink, "/dev/block/")) |
| continue; |
| |
| if (stat(devlink, &st_link) >= 0 && |
| (!S_ISBLK(st_link.st_mode) || |
| st_link.st_rdev != st.st_rdev)) |
| continue; |
| |
| (void) swap_setup_unit(m, devlink, device, prio, set_flags); |
| } |
| } |
| |
| static void swap_set_state(Swap *s, SwapState state) { |
| SwapState old_state; |
| |
| assert(s); |
| |
| if (s->state != state) |
| bus_unit_send_pending_change_signal(UNIT(s), false); |
| |
| old_state = s->state; |
| s->state = state; |
| |
| if (!SWAP_STATE_WITH_PROCESS(state)) { |
| s->timer_event_source = sd_event_source_disable_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], 0); |
| |
| /* 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) && |
| SWAP_STATE_WITH_PROCESS(new_state)) { |
| |
| r = unit_watch_pid(UNIT(s), s->control_pid, false); |
| 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); |
| (void) unit_setup_exec_runtime(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" |
| "%sClean Result: %s\n" |
| "%sWhat: %s\n" |
| "%sFrom /proc/swaps: %s\n" |
| "%sFrom fragment: %s\n" |
| "%sExtrinsic: %s\n", |
| prefix, swap_state_to_string(s->state), |
| prefix, swap_result_to_string(s->result), |
| prefix, swap_result_to_string(s->clean_result), |
| prefix, s->what, |
| prefix, yes_no(s->from_proc_swaps), |
| prefix, yes_no(s->from_fragment), |
| prefix, yes_no(swap_is_extrinsic(u))); |
| |
| 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)); |
| |
| fprintf(f, |
| "%sTimeoutSec: %s\n", |
| prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC)); |
| |
| 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); |
| cgroup_context_dump(UNIT(s), f, prefix); |
| } |
| |
| static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { |
| |
| _cleanup_(exec_params_clear) ExecParameters exec_params = { |
| .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN, |
| .stdin_fd = -EBADF, |
| .stdout_fd = -EBADF, |
| .stderr_fd = -EBADF, |
| .exec_fd = -EBADF, |
| }; |
| pid_t pid; |
| int r; |
| |
| assert(s); |
| assert(c); |
| assert(_pid); |
| |
| r = unit_prepare_exec(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; |
| |
| r = unit_set_exec_params(UNIT(s), &exec_params); |
| if (r < 0) |
| goto fail; |
| |
| 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, true); |
| if (r < 0) |
| goto fail; |
| |
| *_pid = pid; |
| |
| return 0; |
| |
| fail: |
| s->timer_event_source = sd_event_source_disable_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; |
| |
| unit_log_result(UNIT(s), s->result == SWAP_SUCCESS, swap_result_to_string(s->result)); |
| unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop); |
| swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
| |
| s->exec_runtime = exec_runtime_unref(s->exec_runtime, true); |
| |
| unit_destroy_runtime_data(UNIT(s), &s->exec_context); |
| |
| 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_dead_or_active(Swap *s, SwapResult f) { |
| assert(s); |
| |
| if (s->from_proc_swaps) { |
| swap_enter_active(s, f); |
| |
| LIST_FOREACH_OTHERS(same_devnode, other, s) |
| if (UNIT(other)->job) |
| swap_enter_dead_or_active(other, f); |
| } else |
| swap_enter_dead(s, f); |
| } |
| |
| static int state_to_kill_operation(Swap *s, SwapState state) { |
| if (state == SWAP_DEACTIVATING_SIGTERM) { |
| if (unit_has_job_type(UNIT(s), JOB_RESTART)) |
| return KILL_RESTART; |
| else |
| return KILL_TERMINATE; |
| } |
| |
| return KILL_KILL; |
| } |
| |
| 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_to_kill_operation(s, state), |
| -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_DEACTIVATING_SIGTERM && s->kill_context.send_sigkill) |
| swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); |
| else |
| swap_enter_dead_or_active(s, SWAP_SUCCESS); |
| |
| return; |
| |
| fail: |
| log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m"); |
| swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
| } |
| |
| static void swap_enter_activating(Swap *s) { |
| _cleanup_free_ char *opts = NULL; |
| int r; |
| |
| assert(s); |
| |
| unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start); |
| |
| s->control_command_id = SWAP_EXEC_ACTIVATE; |
| s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; |
| |
| if (s->from_fragment) { |
| int priority = 0; |
| |
| r = fstab_find_pri(s->parameters_fragment.options, &priority); |
| if (r < 0) |
| log_unit_warning_errno(UNIT(s), r, "Failed to parse swap priority \"%s\", ignoring: %m", s->parameters_fragment.options); |
| else if (r > 0 && s->parameters_fragment.priority_set) |
| log_unit_warning(UNIT(s), "Duplicate swap priority configuration by Priority= and Options= fields."); |
| |
| if (r <= 0 && s->parameters_fragment.priority_set) { |
| 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) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| } |
| } |
| |
| r = exec_command_set(s->control_command, "/sbin/swapon", "--fixpgsz", 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_or_active(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_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
| } |
| |
| static void swap_cycle_clear(Swap *s) { |
| assert(s); |
| |
| s->result = SWAP_SUCCESS; |
| exec_command_reset_status_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); |
| UNIT(s)->reset_accounting = true; |
| } |
| |
| static int swap_start(Unit *u) { |
| Swap *s = SWAP(u); |
| int r; |
| |
| assert(s); |
| |
| /* We cannot fulfill this request right now, try again later please! */ |
| if (IN_SET(s->state, |
| SWAP_DEACTIVATING, |
| SWAP_DEACTIVATING_SIGTERM, |
| SWAP_DEACTIVATING_SIGKILL, |
| SWAP_CLEANING)) |
| return -EAGAIN; |
| |
| /* Already on it! */ |
| if (s->state == SWAP_ACTIVATING) |
| return 0; |
| |
| assert(IN_SET(s->state, SWAP_DEAD, 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_acquire_invocation_id(u); |
| if (r < 0) |
| return r; |
| |
| swap_cycle_clear(s); |
| swap_enter_activating(s); |
| return 1; |
| } |
| |
| static int swap_stop(Unit *u) { |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| |
| switch (s->state) { |
| |
| case SWAP_DEACTIVATING: |
| case SWAP_DEACTIVATING_SIGTERM: |
| case SWAP_DEACTIVATING_SIGKILL: |
| /* Already on it */ |
| return 0; |
| |
| case SWAP_ACTIVATING: |
| case SWAP_ACTIVATING_DONE: |
| /* There's a control process pending, directly enter kill mode */ |
| swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_SUCCESS); |
| return 0; |
| |
| case SWAP_ACTIVE: |
| if (detect_container() > 0) |
| return -EPERM; |
| |
| swap_enter_deactivating(s); |
| return 1; |
| |
| case SWAP_CLEANING: |
| /* If we are currently cleaning, then abort it, brutally. */ |
| swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); |
| return 0; |
| |
| default: |
| assert_not_reached(); |
| } |
| } |
| |
| static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| assert(f); |
| assert(fds); |
| |
| (void) serialize_item(f, "state", swap_state_to_string(s->state)); |
| (void) serialize_item(f, "result", swap_result_to_string(s->result)); |
| |
| if (s->control_pid > 0) |
| (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid); |
| |
| if (s->control_command_id >= 0) |
| (void) serialize_item(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; |
| } |
| |
| 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; |
| |
| /* Let's scan /proc/swaps before we process SIGCHLD. For the reasoning see the similar code in |
| * mount.c */ |
| (void) swap_process_proc_swaps(u->manager); |
| |
| 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(); |
| |
| 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; |
| } |
| |
| unit_log_process_exit( |
| u, |
| "Swap process", |
| swap_exec_command_to_string(s->control_command_id), |
| f == SWAP_SUCCESS, |
| code, status); |
| |
| switch (s->state) { |
| |
| case SWAP_ACTIVATING: |
| case SWAP_ACTIVATING_DONE: |
| |
| if (f == SWAP_SUCCESS || s->from_proc_swaps) |
| 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_or_active(s, f); |
| break; |
| |
| case SWAP_CLEANING: |
| if (s->clean_result == SWAP_SUCCESS) |
| s->clean_result = f; |
| |
| swap_enter_dead(s, SWAP_SUCCESS); |
| break; |
| |
| default: |
| assert_not_reached(); |
| } |
| |
| /* 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_DEACTIVATING_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_DEACTIVATING_SIGTERM: |
| if (s->kill_context.send_sigkill) { |
| log_unit_warning(UNIT(s), "Swap process timed out. Killing."); |
| swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
| } else { |
| log_unit_warning(UNIT(s), "Swap process timed out. Skipping SIGKILL. Ignoring."); |
| swap_enter_dead_or_active(s, SWAP_FAILURE_TIMEOUT); |
| } |
| break; |
| |
| case SWAP_DEACTIVATING_SIGKILL: |
| log_unit_warning(UNIT(s), "Swap process still around after SIGKILL. Ignoring."); |
| swap_enter_dead_or_active(s, SWAP_FAILURE_TIMEOUT); |
| break; |
| |
| case SWAP_CLEANING: |
| log_unit_warning(UNIT(s), "Cleaning timed out. killing."); |
| |
| if (s->clean_result == SWAP_SUCCESS) |
| s->clean_result = SWAP_FAILURE_TIMEOUT; |
| |
| swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, 0); |
| break; |
| |
| default: |
| assert_not_reached(); |
| } |
| |
| return 0; |
| } |
| |
| static int swap_load_proc_swaps(Manager *m, bool set_flags) { |
| assert(m); |
| |
| rewind(m->proc_swaps); |
| |
| (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
| |
| for (unsigned 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; |
| } |
| |
| ssize_t l = cunescape(dev, UNESCAPE_RELAX, &d); |
| if (l < 0) |
| return log_error_errno(l, "Failed to unescape device path: %m"); |
| |
| device_found_node(m, d, DEVICE_FOUND_SWAP, DEVICE_FOUND_SWAP); |
| |
| (void) swap_process_new(m, d, prio, set_flags); |
| } |
| |
| return 0; |
| } |
| |
| static int swap_process_proc_swaps(Manager *m) { |
| int r; |
| |
| assert(m); |
| |
| 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); |
| |
| assert(swap); |
| |
| 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); |
| |
| assert(swap); |
| |
| if (!swap->is_active) { |
| |
| swap_unset_proc_swaps(swap); |
| |
| switch (swap->state) { |
| |
| case SWAP_ACTIVE: |
| /* This has just been deactivated */ |
| 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, DEVICE_NOT_FOUND, DEVICE_FOUND_SWAP); |
| |
| } else if (swap->just_activated) { |
| |
| /* New swap entry */ |
| |
| switch (swap->state) { |
| |
| case SWAP_DEAD: |
| case SWAP_FAILED: |
| (void) unit_acquire_invocation_id(u); |
| swap_cycle_clear(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 int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
| Manager *m = ASSERT_PTR(userdata); |
| |
| assert(revents & EPOLLPRI); |
| |
| return swap_process_proc_swaps(m); |
| } |
| |
| static Unit *swap_following(Unit *u) { |
| Swap *s = SWAP(u); |
| Swap *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(same_devnode, other, s->same_devnode_next) |
| if (streq_ptr(other->what, other->devnode)) |
| return UNIT(other); |
| |
| LIST_FOREACH_BACKWARDS(same_devnode, other, s->same_devnode_prev) { |
| 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); |
| _cleanup_set_free_ Set *set = NULL; |
| 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) |
| return r; |
| } |
| |
| *_set = TAKE_PTR(set); |
| return 1; |
| } |
| |
| static void swap_shutdown(Manager *m) { |
| assert(m); |
| |
| m->swap_event_source = sd_event_source_disable_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_errno(errno, "Not swap enabled, skipping enumeration."); |
| else |
| log_warning_errno(errno, "Failed to open /proc/swaps, ignoring: %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, SD_EVENT_PRIORITY_NORMAL-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, sd_device *dev) { |
| _cleanup_free_ char *e = NULL; |
| const char *dn, *devlink; |
| Unit *u; |
| int r; |
| |
| assert(m); |
| assert(dev); |
| |
| if (sd_device_get_devname(dev, &dn) < 0) |
| return 0; |
| |
| r = unit_name_from_path(dn, ".swap", &e); |
| if (r < 0) { |
| log_debug_errno(r, "Cannot convert device name '%s' to unit name, ignoring: %m", dn); |
| return 0; |
| } |
| |
| u = manager_get_unit(m, e); |
| if (u) |
| r = swap_set_devnode(SWAP(u), dn); |
| |
| FOREACH_DEVICE_DEVLINK(dev, devlink) { |
| _cleanup_free_ char *n = NULL; |
| int q; |
| |
| q = unit_name_from_path(devlink, ".swap", &n); |
| if (q == -EINVAL) /* If the name is not convertible to unit name, we can't manage it */ |
| continue; |
| if (q < 0) |
| return q; |
| |
| u = manager_get_unit(m, n); |
| if (u) { |
| q = swap_set_devnode(SWAP(u), dn); |
| if (q < 0) |
| r = q; |
| } |
| } |
| |
| return r; |
| } |
| |
| int swap_process_device_remove(Manager *m, sd_device *dev) { |
| const char *dn; |
| int r; |
| Swap *s; |
| |
| r = sd_device_get_devname(dev, &dn); |
| if (r < 0) |
| 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; |
| s->clean_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; |
| |
| assert(s); |
| assert(u); |
| |
| 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 int swap_clean(Unit *u, ExecCleanMask mask) { |
| _cleanup_strv_free_ char **l = NULL; |
| Swap *s = SWAP(u); |
| int r; |
| |
| assert(s); |
| assert(mask != 0); |
| |
| if (s->state != SWAP_DEAD) |
| return -EBUSY; |
| |
| r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l); |
| if (r < 0) |
| return r; |
| |
| if (strv_isempty(l)) |
| return -EUNATCH; |
| |
| swap_unwatch_control_pid(s); |
| s->clean_result = SWAP_SUCCESS; |
| s->control_command = NULL; |
| s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
| |
| r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec)); |
| if (r < 0) |
| goto fail; |
| |
| r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid); |
| if (r < 0) |
| goto fail; |
| |
| swap_set_state(s, SWAP_CLEANING); |
| |
| return 0; |
| |
| fail: |
| log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m"); |
| s->clean_result = SWAP_FAILURE_RESOURCES; |
| s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source); |
| return r; |
| } |
| |
| static int swap_can_clean(Unit *u, ExecCleanMask *ret) { |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| |
| return exec_context_get_clean_mask(&s->exec_context, ret); |
| } |
| |
| static int swap_can_start(Unit *u) { |
| Swap *s = SWAP(u); |
| int r; |
| |
| assert(s); |
| |
| r = unit_test_start_limit(u); |
| if (r < 0) { |
| swap_enter_dead(s, SWAP_FAILURE_START_LIMIT_HIT); |
| return r; |
| } |
| |
| return 1; |
| } |
| |
| 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", |
| |
| .can_fail = 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, |
| .clean = swap_clean, |
| .can_clean = swap_can_clean, |
| |
| .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, |
| |
| .will_restart = unit_will_restart_default, |
| |
| .may_gc = swap_may_gc, |
| .is_extrinsic = swap_is_extrinsic, |
| |
| .sigchld_event = swap_sigchld_event, |
| |
| .reset_failed = swap_reset_failed, |
| |
| .control_pid = swap_control_pid, |
| |
| .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.", |
| }, |
| }, |
| |
| .can_start = swap_can_start, |
| }; |
