| /*-*- 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 <limits.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <sys/epoll.h> |
| #include <sys/stat.h> |
| #include <sys/swap.h> |
| #include <libudev.h> |
| |
| #include "unit.h" |
| #include "swap.h" |
| #include "load-fragment.h" |
| #include "load-dropin.h" |
| #include "unit-name.h" |
| #include "dbus-swap.h" |
| #include "special.h" |
| #include "bus-errors.h" |
| #include "exit-status.h" |
| #include "def.h" |
| #include "path-util.h" |
| |
| static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { |
| [SWAP_DEAD] = UNIT_INACTIVE, |
| [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
| [SWAP_ACTIVE] = UNIT_ACTIVE, |
| [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
| [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING, |
| [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING, |
| [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, |
| [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, |
| [SWAP_FAILED] = UNIT_FAILED |
| }; |
| |
| static void swap_unset_proc_swaps(Swap *s) { |
| Swap *first; |
| |
| assert(s); |
| |
| if (!s->parameters_proc_swaps.what) |
| return; |
| |
| /* Remove this unit from the chain of swaps which share the |
| * same kernel swap device. */ |
| |
| first = hashmap_get(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); |
| LIST_REMOVE(Swap, same_proc_swaps, first, s); |
| |
| if (first) |
| hashmap_remove_and_replace(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first); |
| else |
| hashmap_remove(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); |
| |
| free(s->parameters_proc_swaps.what); |
| s->parameters_proc_swaps.what = NULL; |
| } |
| |
| static void swap_init(Unit *u) { |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| assert(UNIT(s)->load_state == UNIT_STUB); |
| |
| s->timeout_usec = DEFAULT_TIMEOUT_USEC; |
| |
| exec_context_init(&s->exec_context); |
| s->exec_context.std_output = u->manager->default_std_output; |
| s->exec_context.std_error = u->manager->default_std_error; |
| kill_context_init(&s->kill_context); |
| |
| s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
| |
| s->timer_watch.type = WATCH_INVALID; |
| |
| s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
| |
| UNIT(s)->ignore_on_isolate = true; |
| } |
| |
| static void swap_unwatch_control_pid(Swap *s) { |
| assert(s); |
| |
| if (s->control_pid <= 0) |
| return; |
| |
| unit_unwatch_pid(UNIT(s), s->control_pid); |
| s->control_pid = 0; |
| } |
| |
| static void swap_done(Unit *u) { |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| |
| swap_unset_proc_swaps(s); |
| |
| free(s->what); |
| s->what = NULL; |
| |
| free(s->parameters_fragment.what); |
| s->parameters_fragment.what = NULL; |
| |
| exec_context_done(&s->exec_context); |
| exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); |
| s->control_command = NULL; |
| |
| swap_unwatch_control_pid(s); |
| |
| unit_unwatch_timer(u, &s->timer_watch); |
| } |
| |
| int swap_add_one_mount_link(Swap *s, Mount *m) { |
| int r; |
| |
| assert(s); |
| assert(m); |
| |
| if (UNIT(s)->load_state != UNIT_LOADED || |
| UNIT(m)->load_state != UNIT_LOADED) |
| return 0; |
| |
| if (is_device_path(s->what)) |
| return 0; |
| |
| if (!path_startswith(s->what, m->where)) |
| return 0; |
| |
| if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| static int swap_add_mount_links(Swap *s) { |
| Unit *other; |
| int r; |
| |
| assert(s); |
| |
| LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_MOUNT]) |
| if ((r = swap_add_one_mount_link(s, MOUNT(other))) < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| static int swap_add_target_links(Swap *s) { |
| Unit *tu; |
| int r; |
| |
| assert(s); |
| |
| if (!s->from_fragment) |
| return 0; |
| |
| if ((r = manager_load_unit(UNIT(s)->manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0) |
| return r; |
| |
| return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true); |
| } |
| |
| static int swap_add_device_links(Swap *s) { |
| SwapParameters *p; |
| |
| assert(s); |
| |
| if (!s->what) |
| return 0; |
| |
| if (s->from_fragment) |
| p = &s->parameters_fragment; |
| else |
| return 0; |
| |
| if (is_device_path(s->what)) |
| return unit_add_node_link(UNIT(s), s->what, |
| !p->noauto && p->nofail && |
| UNIT(s)->manager->running_as == MANAGER_SYSTEM); |
| else |
| /* File based swap devices need to be ordered after |
| * 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)->manager->running_as != MANAGER_SYSTEM) |
| return 0; |
| |
| r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| static int swap_verify(Swap *s) { |
| bool b; |
| char *e; |
| |
| if (UNIT(s)->load_state != UNIT_LOADED) |
| return 0; |
| |
| if (!(e = unit_name_from_path(s->what, ".swap"))) |
| return -ENOMEM; |
| |
| b = unit_has_name(UNIT(s), e); |
| free(e); |
| |
| if (!b) { |
| log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", UNIT(s)->id); |
| return -EINVAL; |
| } |
| |
| if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) { |
| log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(s)->id); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int swap_load(Unit *u) { |
| int r; |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| assert(u->load_state == UNIT_STUB); |
| |
| /* Load a .swap file */ |
| if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) |
| return r; |
| |
| if (u->load_state == UNIT_LOADED) { |
| if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0) |
| return r; |
| |
| if (UNIT(s)->fragment_path) |
| s->from_fragment = true; |
| |
| if (!s->what) { |
| if (s->parameters_fragment.what) |
| s->what = strdup(s->parameters_fragment.what); |
| else if (s->parameters_proc_swaps.what) |
| s->what = strdup(s->parameters_proc_swaps.what); |
| else |
| s->what = unit_name_to_path(u->id); |
| |
| if (!s->what) |
| return -ENOMEM; |
| } |
| |
| path_kill_slashes(s->what); |
| |
| if (!UNIT(s)->description) |
| if ((r = unit_set_description(u, s->what)) < 0) |
| return r; |
| |
| if ((r = swap_add_device_links(s)) < 0) |
| return r; |
| |
| if ((r = swap_add_mount_links(s)) < 0) |
| return r; |
| |
| if ((r = swap_add_target_links(s)) < 0) |
| return r; |
| |
| if ((r = unit_add_default_cgroups(u)) < 0) |
| return r; |
| |
| if (UNIT(s)->default_dependencies) |
| if ((r = swap_add_default_dependencies(s)) < 0) |
| return r; |
| |
| r = unit_exec_context_defaults(u, &s->exec_context); |
| if (r < 0) |
| return r; |
| } |
| |
| return swap_verify(s); |
| } |
| |
| static int swap_add_one( |
| Manager *m, |
| const char *what, |
| const char *what_proc_swaps, |
| int priority, |
| bool noauto, |
| bool nofail, |
| bool set_flags) { |
| |
| Unit *u = NULL; |
| char *e = NULL, *wp = NULL; |
| bool delete = false; |
| int r; |
| SwapParameters *p; |
| Swap *first; |
| |
| assert(m); |
| assert(what); |
| assert(what_proc_swaps); |
| |
| e = unit_name_from_path(what, ".swap"); |
| if (!e) |
| return -ENOMEM; |
| |
| 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 -EEXIST; |
| |
| if (!u) { |
| delete = true; |
| |
| u = unit_new(m, sizeof(Swap)); |
| if (!u) { |
| free(e); |
| return -ENOMEM; |
| } |
| |
| r = unit_add_name(u, e); |
| if (r < 0) |
| goto fail; |
| |
| SWAP(u)->what = strdup(what); |
| if (!SWAP(u)->what) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| unit_add_to_load_queue(u); |
| } else |
| delete = false; |
| |
| p = &SWAP(u)->parameters_proc_swaps; |
| |
| if (!p->what) { |
| if (!(wp = strdup(what_proc_swaps))) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| if (!m->swaps_by_proc_swaps) |
| if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| free(p->what); |
| p->what = wp; |
| |
| first = hashmap_get(m->swaps_by_proc_swaps, wp); |
| LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u)); |
| |
| if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 0) |
| goto fail; |
| } |
| |
| if (set_flags) { |
| SWAP(u)->is_active = true; |
| SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; |
| } |
| |
| SWAP(u)->from_proc_swaps = true; |
| |
| p->priority = priority; |
| p->noauto = noauto; |
| p->nofail = nofail; |
| |
| unit_add_to_dbus_queue(u); |
| |
| free(e); |
| |
| return 0; |
| |
| fail: |
| log_warning("Failed to load swap unit: %s", strerror(-r)); |
| |
| free(wp); |
| free(e); |
| |
| if (delete && u) |
| unit_free(u); |
| |
| return r; |
| } |
| |
| static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) { |
| struct stat st; |
| int r = 0, k; |
| |
| assert(m); |
| |
| if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) { |
| struct udev_device *d; |
| const char *dn; |
| struct udev_list_entry *item = NULL, *first = NULL; |
| |
| /* So this is a proper swap device. Create swap units |
| * for all names this swap device is known under */ |
| |
| if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev))) |
| return -ENOMEM; |
| |
| dn = udev_device_get_devnode(d); |
| if (dn) |
| r = swap_add_one(m, dn, device, prio, false, false, set_flags); |
| |
| /* Add additional units for all symlinks */ |
| first = udev_device_get_devlinks_list_entry(d); |
| udev_list_entry_foreach(item, first) { |
| const char *p; |
| |
| /* Don't bother with the /dev/block links */ |
| p = udev_list_entry_get_name(item); |
| |
| if (path_startswith(p, "/dev/block/")) |
| continue; |
| |
| if (stat(p, &st) >= 0) |
| if ((!S_ISBLK(st.st_mode)) || st.st_rdev != udev_device_get_devnum(d)) |
| continue; |
| |
| k = swap_add_one(m, p, device, prio, false, false, set_flags); |
| if (k < 0) |
| r = k; |
| } |
| |
| udev_device_unref(d); |
| } |
| |
| k = swap_add_one(m, device, device, prio, false, false, set_flags); |
| if (k < 0) |
| r = k; |
| |
| return r; |
| } |
| |
| static void swap_set_state(Swap *s, SwapState state) { |
| SwapState old_state; |
| |
| assert(s); |
| |
| old_state = s->state; |
| s->state = state; |
| |
| if (state != SWAP_ACTIVATING && |
| state != SWAP_ACTIVATING_SIGTERM && |
| state != SWAP_ACTIVATING_SIGKILL && |
| state != SWAP_DEACTIVATING && |
| state != SWAP_DEACTIVATING_SIGTERM && |
| state != SWAP_DEACTIVATING_SIGKILL) { |
| unit_unwatch_timer(UNIT(s), &s->timer_watch); |
| swap_unwatch_control_pid(s); |
| s->control_command = NULL; |
| s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
| } |
| |
| if (state != old_state) |
| log_debug("%s changed %s -> %s", |
| UNIT(s)->id, |
| swap_state_to_string(old_state), |
| swap_state_to_string(state)); |
| |
| unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
| } |
| |
| static int swap_coldplug(Unit *u) { |
| Swap *s = SWAP(u); |
| SwapState new_state = SWAP_DEAD; |
| int r; |
| |
| assert(s); |
| assert(s->state == SWAP_DEAD); |
| |
| if (s->deserialized_state != s->state) |
| new_state = s->deserialized_state; |
| else if (s->from_proc_swaps) |
| new_state = SWAP_ACTIVE; |
| |
| if (new_state != s->state) { |
| |
| if (new_state == SWAP_ACTIVATING || |
| new_state == SWAP_ACTIVATING_SIGTERM || |
| new_state == SWAP_ACTIVATING_SIGKILL || |
| new_state == SWAP_DEACTIVATING || |
| new_state == SWAP_DEACTIVATING_SIGTERM || |
| new_state == SWAP_DEACTIVATING_SIGKILL) { |
| |
| if (s->control_pid <= 0) |
| return -EBADMSG; |
| |
| if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0) |
| return r; |
| |
| if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) |
| return r; |
| } |
| |
| swap_set_state(s, new_state); |
| } |
| |
| return 0; |
| } |
| |
| static void swap_dump(Unit *u, FILE *f, const char *prefix) { |
| Swap *s = SWAP(u); |
| SwapParameters *p; |
| |
| assert(s); |
| assert(f); |
| |
| if (s->from_proc_swaps) |
| p = &s->parameters_proc_swaps; |
| else if (s->from_fragment) |
| p = &s->parameters_fragment; |
| else |
| p = 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 (p) |
| fprintf(f, |
| "%sPriority: %i\n" |
| "%sNoAuto: %s\n" |
| "%sNoFail: %s\n", |
| prefix, p->priority, |
| prefix, yes_no(p->noauto), |
| prefix, yes_no(p->nofail)); |
| |
| if (s->control_pid > 0) |
| fprintf(f, |
| "%sControl PID: %lu\n", |
| prefix, (unsigned long) s->control_pid); |
| |
| exec_context_dump(&s->exec_context, f, prefix); |
| kill_context_dump(&s->kill_context, f, prefix); |
| } |
| |
| static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { |
| pid_t pid; |
| int r; |
| |
| assert(s); |
| assert(c); |
| assert(_pid); |
| |
| if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) |
| goto fail; |
| |
| if ((r = exec_spawn(c, |
| NULL, |
| &s->exec_context, |
| NULL, 0, |
| UNIT(s)->manager->environment, |
| true, |
| true, |
| true, |
| UNIT(s)->manager->confirm_spawn, |
| UNIT(s)->cgroup_bondings, |
| UNIT(s)->cgroup_attributes, |
| NULL, |
| UNIT(s)->id, |
| NULL, |
| &pid)) < 0) |
| goto fail; |
| |
| if ((r = unit_watch_pid(UNIT(s), pid)) < 0) |
| /* FIXME: we need to do something here */ |
| goto fail; |
| |
| *_pid = pid; |
| |
| return 0; |
| |
| fail: |
| unit_unwatch_timer(UNIT(s), &s->timer_watch); |
| |
| return r; |
| } |
| |
| static void swap_enter_dead(Swap *s, SwapResult f) { |
| assert(s); |
| |
| if (f != SWAP_SUCCESS) |
| s->result = f; |
| |
| swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
| } |
| |
| static void swap_enter_active(Swap *s, SwapResult f) { |
| assert(s); |
| |
| if (f != SWAP_SUCCESS) |
| s->result = f; |
| |
| swap_set_state(s, SWAP_ACTIVE); |
| } |
| |
| static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
| int r; |
| Set *pid_set = NULL; |
| bool wait_for_exit = false; |
| |
| assert(s); |
| |
| if (f != SWAP_SUCCESS) |
| s->result = f; |
| |
| if (s->kill_context.kill_mode != KILL_NONE) { |
| int sig = (state == SWAP_ACTIVATING_SIGTERM || |
| state == SWAP_DEACTIVATING_SIGTERM) ? s->kill_context.kill_signal : SIGKILL; |
| |
| if (s->control_pid > 0) { |
| if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH) |
| |
| log_warning("Failed to kill control process %li: %m", (long) s->control_pid); |
| else |
| wait_for_exit = true; |
| } |
| |
| if (s->kill_context.kill_mode == KILL_CONTROL_GROUP) { |
| |
| if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| /* Exclude the control pid from being killed via the cgroup */ |
| if (s->control_pid > 0) |
| if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) |
| goto fail; |
| |
| r = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, sig, true, false, pid_set, NULL); |
| if (r < 0) { |
| if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) |
| log_warning("Failed to kill control group: %s", strerror(-r)); |
| } else if (r > 0) |
| wait_for_exit = true; |
| |
| set_free(pid_set); |
| pid_set = NULL; |
| } |
| } |
| |
| if (wait_for_exit) { |
| if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) |
| goto fail; |
| |
| swap_set_state(s, state); |
| } else |
| swap_enter_dead(s, SWAP_SUCCESS); |
| |
| return; |
| |
| fail: |
| log_warning("%s failed to kill processes: %s", UNIT(s)->id, strerror(-r)); |
| |
| swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
| |
| if (pid_set) |
| set_free(pid_set); |
| } |
| |
| static void swap_enter_activating(Swap *s) { |
| int r, priority; |
| |
| assert(s); |
| |
| s->control_command_id = SWAP_EXEC_ACTIVATE; |
| s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; |
| |
| if (s->from_fragment) |
| priority = s->parameters_fragment.priority; |
| else |
| priority = -1; |
| |
| if (priority >= 0) { |
| char p[LINE_MAX]; |
| |
| snprintf(p, sizeof(p), "%i", priority); |
| char_array_0(p); |
| |
| r = exec_command_set( |
| s->control_command, |
| "/sbin/swapon", |
| "-p", |
| p, |
| s->what, |
| NULL); |
| } else |
| r = exec_command_set( |
| s->control_command, |
| "/sbin/swapon", |
| s->what, |
| NULL); |
| |
| if (r < 0) |
| goto fail; |
| |
| swap_unwatch_control_pid(s); |
| |
| if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) |
| goto fail; |
| |
| swap_set_state(s, SWAP_ACTIVATING); |
| |
| return; |
| |
| fail: |
| log_warning("%s failed to run 'swapon' task: %s", UNIT(s)->id, strerror(-r)); |
| swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
| } |
| |
| static void swap_enter_deactivating(Swap *s) { |
| int r; |
| |
| assert(s); |
| |
| s->control_command_id = SWAP_EXEC_DEACTIVATE; |
| s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; |
| |
| if ((r = exec_command_set( |
| s->control_command, |
| "/sbin/swapoff", |
| s->what, |
| NULL)) < 0) |
| goto fail; |
| |
| swap_unwatch_control_pid(s); |
| |
| if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) |
| goto fail; |
| |
| swap_set_state(s, SWAP_DEACTIVATING); |
| |
| return; |
| |
| fail: |
| log_warning("%s failed to run 'swapoff' task: %s", UNIT(s)->id, strerror(-r)); |
| swap_enter_active(s, SWAP_FAILURE_RESOURCES); |
| } |
| |
| static int swap_start(Unit *u) { |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| |
| /* We cannot fulfill this request right now, try again later |
| * please! */ |
| |
| if (s->state == SWAP_DEACTIVATING || |
| s->state == SWAP_DEACTIVATING_SIGTERM || |
| s->state == SWAP_DEACTIVATING_SIGKILL || |
| s->state == SWAP_ACTIVATING_SIGTERM || |
| s->state == SWAP_ACTIVATING_SIGKILL) |
| return -EAGAIN; |
| |
| if (s->state == SWAP_ACTIVATING) |
| return 0; |
| |
| assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); |
| |
| s->result = SWAP_SUCCESS; |
| swap_enter_activating(s); |
| return 0; |
| } |
| |
| static int swap_stop(Unit *u) { |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| |
| if (s->state == SWAP_DEACTIVATING || |
| s->state == SWAP_DEACTIVATING_SIGTERM || |
| s->state == SWAP_DEACTIVATING_SIGKILL || |
| s->state == SWAP_ACTIVATING_SIGTERM || |
| s->state == SWAP_ACTIVATING_SIGKILL) |
| return 0; |
| |
| assert(s->state == SWAP_ACTIVATING || |
| s->state == SWAP_ACTIVE); |
| |
| swap_enter_deactivating(s); |
| return 0; |
| } |
| |
| static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| assert(f); |
| assert(fds); |
| |
| unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); |
| unit_serialize_item(u, f, "result", swap_result_to_string(s->result)); |
| |
| if (s->control_pid > 0) |
| unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid); |
| |
| if (s->control_command_id >= 0) |
| unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); |
| |
| return 0; |
| } |
| |
| static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| assert(fds); |
| |
| if (streq(key, "state")) { |
| SwapState state; |
| |
| if ((state = swap_state_from_string(value)) < 0) |
| log_debug("Failed to parse state value %s", value); |
| else |
| s->deserialized_state = state; |
| } else if (streq(key, "result")) { |
| SwapResult f; |
| |
| f = swap_result_from_string(value); |
| if (f < 0) |
| log_debug("Failed to parse result value %s", value); |
| else if (f != SWAP_SUCCESS) |
| s->result = f; |
| } else if (streq(key, "control-pid")) { |
| pid_t pid; |
| |
| if (parse_pid(value, &pid) < 0) |
| log_debug("Failed to parse control-pid value %s", value); |
| else |
| s->control_pid = pid; |
| |
| } else if (streq(key, "control-command")) { |
| SwapExecCommand id; |
| |
| if ((id = swap_exec_command_from_string(value)) < 0) |
| log_debug("Failed to parse exec-command value %s", value); |
| else { |
| s->control_command_id = id; |
| s->control_command = s->exec_command + id; |
| } |
| |
| } else |
| log_debug("Unknown serialization key '%s'", key); |
| |
| return 0; |
| } |
| |
| static UnitActiveState swap_active_state(Unit *u) { |
| assert(u); |
| |
| return state_translation_table[SWAP(u)->state]; |
| } |
| |
| static const char *swap_sub_state_to_string(Unit *u) { |
| assert(u); |
| |
| return swap_state_to_string(SWAP(u)->state); |
| } |
| |
| static bool swap_check_gc(Unit *u) { |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| |
| return s->from_proc_swaps; |
| } |
| |
| static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
| Swap *s = SWAP(u); |
| SwapResult f; |
| |
| assert(s); |
| assert(pid >= 0); |
| |
| if (pid != s->control_pid) |
| return; |
| |
| s->control_pid = 0; |
| |
| if (is_clean_exit(code, status)) |
| f = SWAP_SUCCESS; |
| else if (code == CLD_EXITED) |
| f = SWAP_FAILURE_EXIT_CODE; |
| else if (code == CLD_KILLED) |
| f = SWAP_FAILURE_SIGNAL; |
| else if (code == CLD_DUMPED) |
| f = SWAP_FAILURE_CORE_DUMP; |
| else |
| assert_not_reached("Unknown code"); |
| |
| if (f != SWAP_SUCCESS) |
| s->result = f; |
| |
| if (s->control_command) { |
| exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
| |
| s->control_command = NULL; |
| s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
| } |
| |
| log_full(f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, |
| "%s swap process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status); |
| |
| switch (s->state) { |
| |
| case SWAP_ACTIVATING: |
| case SWAP_ACTIVATING_SIGTERM: |
| case SWAP_ACTIVATING_SIGKILL: |
| |
| if (f == SWAP_SUCCESS) |
| swap_enter_active(s, f); |
| else |
| swap_enter_dead(s, f); |
| break; |
| |
| case SWAP_DEACTIVATING: |
| case SWAP_DEACTIVATING_SIGKILL: |
| case SWAP_DEACTIVATING_SIGTERM: |
| |
| if (f == SWAP_SUCCESS) |
| swap_enter_dead(s, f); |
| else |
| swap_enter_dead(s, f); |
| break; |
| |
| default: |
| assert_not_reached("Uh, control process died at wrong time."); |
| } |
| |
| /* Notify clients about changed exit status */ |
| unit_add_to_dbus_queue(u); |
| |
| /* Request a reload of /proc/swaps, so that following units |
| * can follow our state change */ |
| u->manager->request_reload = true; |
| } |
| |
| static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) { |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| assert(elapsed == 1); |
| assert(w == &s->timer_watch); |
| |
| switch (s->state) { |
| |
| case SWAP_ACTIVATING: |
| log_warning("%s activation timed out. Stopping.", u->id); |
| swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
| break; |
| |
| case SWAP_DEACTIVATING: |
| log_warning("%s deactivation timed out. Stopping.", u->id); |
| swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
| break; |
| |
| case SWAP_ACTIVATING_SIGTERM: |
| if (s->kill_context.send_sigkill) { |
| log_warning("%s activation timed out. Killing.", u->id); |
| swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
| } else { |
| log_warning("%s activation timed out. Skipping SIGKILL. Ignoring.", u->id); |
| swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
| } |
| break; |
| |
| case SWAP_DEACTIVATING_SIGTERM: |
| if (s->kill_context.send_sigkill) { |
| log_warning("%s deactivation timed out. Killing.", u->id); |
| swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
| } else { |
| log_warning("%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->id); |
| swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
| } |
| break; |
| |
| case SWAP_ACTIVATING_SIGKILL: |
| case SWAP_DEACTIVATING_SIGKILL: |
| log_warning("%s swap process still around after SIGKILL. Ignoring.", u->id); |
| swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
| break; |
| |
| default: |
| assert_not_reached("Timeout at wrong time."); |
| } |
| } |
| |
| static int swap_load_proc_swaps(Manager *m, bool set_flags) { |
| unsigned i; |
| int r = 0; |
| |
| assert(m); |
| |
| rewind(m->proc_swaps); |
| |
| (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
| |
| for (i = 1;; i++) { |
| char *dev = NULL, *d; |
| int prio = 0, k; |
| |
| if ((k = fscanf(m->proc_swaps, |
| "%ms " /* device/file */ |
| "%*s " /* type of swap */ |
| "%*s " /* swap size */ |
| "%*s " /* used */ |
| "%i\n", /* priority */ |
| &dev, &prio)) != 2) { |
| |
| if (k == EOF) |
| break; |
| |
| log_warning("Failed to parse /proc/swaps:%u.", i); |
| free(dev); |
| continue; |
| } |
| |
| d = cunescape(dev); |
| free(dev); |
| |
| if (!d) |
| return -ENOMEM; |
| |
| k = swap_process_new_swap(m, d, prio, set_flags); |
| free(d); |
| |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| int swap_dispatch_reload(Manager *m) { |
| /* This function should go as soon as the kernel properly notifies us */ |
| |
| if (_likely_(!m->request_reload)) |
| return 0; |
| |
| m->request_reload = false; |
| |
| return swap_fd_event(m, EPOLLPRI); |
| } |
| |
| int swap_fd_event(Manager *m, int events) { |
| Unit *u; |
| int r; |
| |
| assert(m); |
| assert(events & EPOLLPRI); |
| |
| if ((r = swap_load_proc_swaps(m, true)) < 0) { |
| log_error("Failed to reread /proc/swaps: %s", strerror(-r)); |
| |
| /* Reset flags, just in case, for late calls */ |
| LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
| Swap *swap = SWAP(u); |
| |
| swap->is_active = swap->just_activated = false; |
| } |
| |
| return 0; |
| } |
| |
| manager_dispatch_load_queue(m); |
| |
| LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
| Swap *swap = SWAP(u); |
| |
| if (!swap->is_active) { |
| /* This has just been deactivated */ |
| |
| swap->from_proc_swaps = false; |
| swap_unset_proc_swaps(swap); |
| |
| switch (swap->state) { |
| |
| case SWAP_ACTIVE: |
| swap_enter_dead(swap, SWAP_SUCCESS); |
| break; |
| |
| default: |
| swap_set_state(swap, swap->state); |
| break; |
| } |
| |
| } else if (swap->just_activated) { |
| |
| /* New swap entry */ |
| |
| switch (swap->state) { |
| |
| case SWAP_DEAD: |
| case SWAP_FAILED: |
| swap_enter_active(swap, SWAP_SUCCESS); |
| break; |
| |
| default: |
| /* Nothing really changed, but let's |
| * issue an notification call |
| * nonetheless, in case somebody is |
| * waiting for this. */ |
| swap_set_state(swap, swap->state); |
| break; |
| } |
| } |
| |
| /* Reset the flags for later calls */ |
| swap->is_active = swap->just_activated = false; |
| } |
| |
| return 1; |
| } |
| |
| static Unit *swap_following(Unit *u) { |
| Swap *s = SWAP(u); |
| Swap *other, *first = NULL; |
| |
| assert(s); |
| |
| if (streq_ptr(s->what, s->parameters_proc_swaps.what)) |
| return NULL; |
| |
| /* Make everybody follow the unit that's named after the swap |
| * device in the kernel */ |
| |
| LIST_FOREACH_AFTER(same_proc_swaps, other, s) |
| if (streq_ptr(other->what, other->parameters_proc_swaps.what)) |
| return UNIT(other); |
| |
| LIST_FOREACH_BEFORE(same_proc_swaps, other, s) { |
| if (streq_ptr(other->what, other->parameters_proc_swaps.what)) |
| return UNIT(other); |
| |
| first = other; |
| } |
| |
| return UNIT(first); |
| } |
| |
| static int swap_following_set(Unit *u, Set **_set) { |
| Swap *s = SWAP(u); |
| Swap *other; |
| Set *set; |
| int r; |
| |
| assert(s); |
| assert(_set); |
| |
| if (LIST_JUST_US(same_proc_swaps, s)) { |
| *_set = NULL; |
| return 0; |
| } |
| |
| if (!(set = set_new(NULL, NULL))) |
| return -ENOMEM; |
| |
| LIST_FOREACH_AFTER(same_proc_swaps, other, s) |
| if ((r = set_put(set, other)) < 0) |
| goto fail; |
| |
| LIST_FOREACH_BEFORE(same_proc_swaps, other, s) |
| if ((r = set_put(set, other)) < 0) |
| goto fail; |
| |
| *_set = set; |
| return 1; |
| |
| fail: |
| set_free(set); |
| return r; |
| } |
| |
| static void swap_shutdown(Manager *m) { |
| assert(m); |
| |
| if (m->proc_swaps) { |
| fclose(m->proc_swaps); |
| m->proc_swaps = NULL; |
| } |
| |
| hashmap_free(m->swaps_by_proc_swaps); |
| m->swaps_by_proc_swaps = NULL; |
| } |
| |
| static int swap_enumerate(Manager *m) { |
| int r; |
| struct epoll_event ev; |
| assert(m); |
| |
| if (!m->proc_swaps) { |
| if (!(m->proc_swaps = fopen("/proc/swaps", "re"))) |
| return (errno == ENOENT) ? 0 : -errno; |
| |
| m->swap_watch.type = WATCH_SWAP; |
| m->swap_watch.fd = fileno(m->proc_swaps); |
| |
| zero(ev); |
| ev.events = EPOLLPRI; |
| ev.data.ptr = &m->swap_watch; |
| |
| if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0) |
| return -errno; |
| } |
| |
| if ((r = swap_load_proc_swaps(m, false)) < 0) |
| swap_shutdown(m); |
| |
| return r; |
| } |
| |
| static void swap_reset_failed(Unit *u) { |
| Swap *s = SWAP(u); |
| |
| assert(s); |
| |
| if (s->state == SWAP_FAILED) |
| swap_set_state(s, SWAP_DEAD); |
| |
| s->result = SWAP_SUCCESS; |
| } |
| |
| static int swap_kill(Unit *u, KillWho who, int signo, DBusError *error) { |
| Swap *s = SWAP(u); |
| int r = 0; |
| Set *pid_set = NULL; |
| |
| assert(s); |
| |
| if (who == KILL_MAIN) { |
| dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes"); |
| return -ESRCH; |
| } |
| |
| if (s->control_pid <= 0 && who == KILL_CONTROL) { |
| dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill"); |
| return -ESRCH; |
| } |
| |
| if (who == KILL_CONTROL || who == KILL_ALL) |
| if (s->control_pid > 0) |
| if (kill(s->control_pid, signo) < 0) |
| r = -errno; |
| |
| if (who == KILL_ALL) { |
| int q; |
| |
| pid_set = set_new(trivial_hash_func, trivial_compare_func); |
| if (!pid_set) |
| return -ENOMEM; |
| |
| /* Exclude the control pid from being killed via the cgroup */ |
| if (s->control_pid > 0) { |
| q = set_put(pid_set, LONG_TO_PTR(s->control_pid)); |
| if (q < 0) { |
| r = q; |
| goto finish; |
| } |
| } |
| |
| q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, false, pid_set, NULL); |
| if (q < 0 && q != -EAGAIN && q != -ESRCH && q != -ENOENT) |
| r = q; |
| } |
| |
| finish: |
| if (pid_set) |
| set_free(pid_set); |
| |
| return r; |
| } |
| |
| static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
| [SWAP_DEAD] = "dead", |
| [SWAP_ACTIVATING] = "activating", |
| [SWAP_ACTIVE] = "active", |
| [SWAP_DEACTIVATING] = "deactivating", |
| [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", |
| [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", |
| [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", |
| [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", |
| [SWAP_FAILED] = "failed" |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); |
| |
| static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
| [SWAP_EXEC_ACTIVATE] = "ExecActivate", |
| [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); |
| |
| static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
| [SWAP_SUCCESS] = "success", |
| [SWAP_FAILURE_RESOURCES] = "resources", |
| [SWAP_FAILURE_TIMEOUT] = "timeout", |
| [SWAP_FAILURE_EXIT_CODE] = "exit-code", |
| [SWAP_FAILURE_SIGNAL] = "signal", |
| [SWAP_FAILURE_CORE_DUMP] = "core-dump" |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); |
| |
| const UnitVTable swap_vtable = { |
| .object_size = sizeof(Swap), |
| .sections = |
| "Unit\0" |
| "Swap\0" |
| "Install\0", |
| |
| .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, |
| |
| .serialize = swap_serialize, |
| .deserialize_item = swap_deserialize_item, |
| |
| .active_state = swap_active_state, |
| .sub_state_to_string = swap_sub_state_to_string, |
| |
| .check_gc = swap_check_gc, |
| |
| .sigchld_event = swap_sigchld_event, |
| .timer_event = swap_timer_event, |
| |
| .reset_failed = swap_reset_failed, |
| |
| .bus_interface = "org.freedesktop.systemd1.Swap", |
| .bus_message_handler = bus_swap_message_handler, |
| .bus_invalidating_properties = bus_swap_invalidating_properties, |
| |
| .following = swap_following, |
| .following_set = swap_following_set, |
| |
| .enumerate = swap_enumerate, |
| .shutdown = swap_shutdown, |
| |
| .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.", |
| }, |
| }, |
| }; |