diff options
Diffstat (limited to 'src/core/swap.c')
| -rw-r--r-- | src/core/swap.c | 1433 |
1 files changed, 0 insertions, 1433 deletions
diff --git a/src/core/swap.c b/src/core/swap.c deleted file mode 100644 index 97145a9974..0000000000 --- a/src/core/swap.c +++ /dev/null @@ -1,1433 +0,0 @@ -/*-*- 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" -#include "virt.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; - Hashmap *swaps; - - assert(s); - - if (!s->parameters_proc_swaps.what) - return; - - /* Remove this unit from the chain of swaps which share the - * same kernel swap device. */ - swaps = UNIT(s)->manager->swaps_by_proc_swaps; - first = hashmap_get(swaps, s->parameters_proc_swaps.what); - LIST_REMOVE(Swap, same_proc_swaps, first, s); - - if (first) - hashmap_remove_and_replace(swaps, - s->parameters_proc_swaps.what, - first->parameters_proc_swaps.what, - first); - else - hashmap_remove(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; - - r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true); - if (r < 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_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 == SYSTEMD_SYSTEM); - else - /* File based swap devices need to be ordered after - * systemd-remount-fs.service, since they might need a - * writable file system. */ - return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true); -} - -static int swap_add_default_dependencies(Swap *s) { - int r; - - assert(s); - - if (UNIT(s)->manager->running_as != SYSTEMD_SYSTEM) - return 0; - - if (detect_container(NULL) > 0) - 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 _cleanup_free_ *e = NULL; - - if (UNIT(s)->load_state != UNIT_LOADED) - return 0; - - e = unit_name_from_path(s->what, ".swap"); - if (e == NULL) - return log_oom(); - - b = unit_has_name(UNIT(s), e); - if (!b) { - log_error("%s: Value of \"What\" and unit name do not match, not loading.", UNIT(s)->id); - return -EINVAL; - } - - if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) { - log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load.", UNIT(s)->id); - return -EINVAL; - } - - return 0; -} - -static int swap_load(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) { - r = unit_add_exec_dependencies(u, &s->exec_context); - if (r < 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; - - r = swap_add_device_links(s); - if (r < 0) - return r; - - r = swap_add_mount_links(s); - if (r < 0) - return r; - - r = unit_add_default_cgroups(u); - if (r < 0) - return r; - - if (UNIT(s)->default_dependencies) { - r = swap_add_default_dependencies(s); - if (r < 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 _cleanup_free_ *e = NULL; - char *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 log_oom(); - - u = manager_get_unit(m, e); - - if (u && - SWAP(u)->from_proc_swaps && - !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) - return -EEXIST; - - if (!u) { - delete = true; - - u = unit_new(m, sizeof(Swap)); - if (!u) - return log_oom(); - - r = unit_add_name(u, e); - if (r < 0) - goto fail; - - SWAP(u)->what = strdup(what); - if (!SWAP(u)->what) { - r = log_oom(); - goto fail; - } - - unit_add_to_load_queue(u); - } else - delete = false; - - p = &SWAP(u)->parameters_proc_swaps; - - if (!p->what) { - wp = strdup(what_proc_swaps); - if (!wp) { - r = log_oom(); - goto fail; - } - - if (!m->swaps_by_proc_swaps) { - m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func); - if (!m->swaps_by_proc_swaps) { - r = log_oom(); - 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)); - - r = hashmap_replace(m->swaps_by_proc_swaps, wp, first); - if (r < 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); - - return 0; - -fail: - log_warning("Failed to load swap unit: %s", strerror(-r)); - - free(wp); - - 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 */ - - d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev); - if (!d) - return log_oom(); - - dn = udev_device_get_devnode(d); - /* Skip dn==device, since that case will be handled below */ - if (dn && !streq(dn, device)) - 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; - - r = unit_watch_pid(UNIT(s), s->control_pid); - if (r < 0) - return r; - - r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch); - if (r < 0) - return r; - } - - swap_set_state(s, new_state); - } - - return 0; -} - -static void swap_dump(Unit *u, FILE *f, const char *prefix) { - Swap *s = SWAP(u); - SwapParameters *p; - - assert(s); - assert(f); - - if (s->from_proc_swaps) - p = &s->parameters_proc_swaps; - else if (s->from_fragment) - p = &s->parameters_fragment; - else - p = NULL; - - fprintf(f, - "%sSwap State: %s\n" - "%sResult: %s\n" - "%sWhat: %s\n" - "%sFrom /proc/swaps: %s\n" - "%sFrom fragment: %s\n", - prefix, swap_state_to_string(s->state), - prefix, swap_result_to_string(s->result), - prefix, s->what, - prefix, yes_no(s->from_proc_swaps), - prefix, yes_no(s->from_fragment)); - - if (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); - - r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch); - if (r < 0) - goto fail; - - 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); - 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: - 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) { - - pid_set = set_new(trivial_hash_func, trivial_compare_func); - if (!pid_set) { - r = log_oom(); - goto fail; - } - - /* Exclude the control pid from being killed via the cgroup */ - if (s->control_pid > 0) { - r = set_put(pid_set, LONG_TO_PTR(s->control_pid)); - if (r < 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) { - r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch); - if (r < 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); - - r = swap_spawn(s, s->control_command, &s->control_pid); - if (r < 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; - - 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_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); - - if (detect_container(NULL) > 0) - return -EPERM; - - 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); - - if (detect_container(NULL) > 0) - return -EPERM; - - 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; - - state = swap_state_from_string(value); - if (state < 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; - - id = swap_exec_command_from_string(value); - if (id < 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, NULL)) - f = SWAP_SUCCESS; - else if (code == CLD_EXITED) - f = SWAP_FAILURE_EXIT_CODE; - else if (code == CLD_KILLED) - f = SWAP_FAILURE_SIGNAL; - else if (code == CLD_DUMPED) - f = SWAP_FAILURE_CORE_DUMP; - else - assert_not_reached("Unknown code"); - - if (f != SWAP_SUCCESS) - s->result = f; - - if (s->control_command) { - exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); - - s->control_command = NULL; - s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; - } - - log_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; - - 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); - 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); - - r = swap_load_proc_swaps(m, true); - if (r < 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) { - m->proc_swaps = fopen("/proc/swaps", "re"); - if (!m->proc_swaps) - 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; - } - - r = swap_load_proc_swaps(m, false); - if (r < 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), - .exec_context_offset = offsetof(Swap, exec_context), - - .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.", - }, - }, -}; |