/*-*- 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 General Public License as published by the Free Software Foundation; either version 2 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 General Public License for more details. You should have received a copy of the GNU 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" 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(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); LIST_REMOVE(Swap, same_proc_swaps, first, s); if (first) hashmap_remove_and_replace(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first); else hashmap_remove(s->meta.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(s->meta.load_state == UNIT_STUB); s->timeout_usec = DEFAULT_TIMEOUT_USEC; exec_context_init(&s->exec_context); s->parameters_etc_fstab.priority = s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; s->timer_watch.type = WATCH_INVALID; s->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; } 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_etc_fstab.what); free(s->parameters_fragment.what); s->parameters_etc_fstab.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 (s->meta.load_state != UNIT_LOADED || m->meta.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) { Meta *other; int r; assert(s); LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_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; SwapParameters *p; int r; assert(s); if (s->from_fragment) p = &s->parameters_fragment; else if (s->from_etc_fstab) p = &s->parameters_etc_fstab; else return 0; if ((r = manager_load_unit(s->meta.manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0) return r; if (!p->noauto && (p->handle || s->meta.manager->swap_auto) && s->from_etc_fstab && s->meta.manager->running_as == MANAGER_SYSTEM) if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 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 if (s->from_etc_fstab) p = &s->parameters_etc_fstab; else return 0; return unit_add_node_link(UNIT(s), s->what, !p->noauto && p->nofail && s->meta.manager->running_as == MANAGER_SYSTEM); } static int swap_add_default_dependencies(Swap *s) { int r; assert(s); if (s->meta.manager->running_as == MANAGER_SYSTEM) { if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0) return r; } return 0; } static int swap_verify(Swap *s) { bool b; char *e; if (s->meta.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", s->meta.id); return -EINVAL; } if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) { log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id); return -EINVAL; } return 0; } static int swap_load(Unit *u) { int r; Swap *s = SWAP(u); assert(s); assert(u->meta.load_state == UNIT_STUB); /* Load a .swap file */ if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) return r; if (u->meta.load_state == UNIT_LOADED) { if (s->meta.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_etc_fstab.what) s->what = strdup(s->parameters_etc_fstab.what); else if (s->parameters_proc_swaps.what) s->what = strdup(s->parameters_proc_swaps.what); else s->what = unit_name_to_path(u->meta.id); if (!s->what) return -ENOMEM; } path_kill_slashes(s->what); if (!s->meta.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_cgroup(u)) < 0) return r; if (s->meta.default_dependencies) if ((r = swap_add_default_dependencies(s)) < 0) return r; } return swap_verify(s); } int swap_add_one( Manager *m, const char *what, const char *what_proc_swaps, int priority, bool noauto, bool nofail, bool handle, bool set_flags) { Unit *u = NULL; char *e = NULL, *wp = NULL; bool delete = false; int r; SwapParameters *p; assert(m); assert(what); if (!(e = unit_name_from_path(what, ".swap"))) return -ENOMEM; u = manager_get_unit(m, e); if (what_proc_swaps && u && SWAP(u)->from_proc_swaps && !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) return -EEXIST; if (!u) { delete = true; if (!(u = unit_new(m))) { free(e); return -ENOMEM; } if ((r = unit_add_name(u, e)) < 0) goto fail; if (!(SWAP(u)->what = strdup(what))) { r = -ENOMEM; goto fail; } unit_add_to_load_queue(u); } else delete = false; if (what_proc_swaps) { Swap *first; 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; } else { p = &SWAP(u)->parameters_etc_fstab; if (!(wp = strdup(what))) { r = -ENOMEM; goto fail; } free(p->what); p->what = wp; SWAP(u)->from_etc_fstab = true; } p->priority = priority; p->noauto = noauto; p->nofail = nofail; p->handle = handle; 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; if ((dn = udev_device_get_devnode(d))) r = swap_add_one(m, dn, device, prio, false, 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; if ((k = swap_add_one(m, p, device, prio, false, false, false, set_flags)) < 0) r = k; } udev_device_unref(d); } if ((k = swap_add_one(m, device, device, prio, false, false, false, set_flags)) < 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", s->meta.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]); } 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 = &s->parameters_etc_fstab; fprintf(f, "%sSwap State: %s\n" "%sWhat: %s\n" "%sPriority: %i\n" "%sNoAuto: %s\n" "%sNoFail: %s\n" "%sHandle: %s\n" "%sFrom /etc/fstab: %s\n" "%sFrom /proc/swaps: %s\n" "%sFrom fragment: %s\n", prefix, swap_state_to_string(s->state), prefix, s->what, prefix, p->priority, prefix, yes_no(p->noauto), prefix, yes_no(p->nofail), prefix, yes_no(p->handle), prefix, yes_no(s->from_etc_fstab), prefix, yes_no(s->from_proc_swaps), prefix, yes_no(s->from_fragment)); 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); } 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, s->meta.manager->environment, true, true, true, s->meta.manager->confirm_spawn, s->meta.cgroup_bondings, &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, bool success) { assert(s); if (!success) s->failure = true; swap_set_state(s, s->failure ? SWAP_FAILED : SWAP_DEAD); } static void swap_enter_active(Swap *s, bool success) { assert(s); if (!success) s->failure = true; swap_set_state(s, SWAP_ACTIVE); } static void swap_enter_signal(Swap *s, SwapState state, bool success) { int r; Set *pid_set = NULL; bool wait_for_exit = false; assert(s); if (!success) s->failure = true; if (s->exec_context.kill_mode != KILL_NONE) { int sig = (state == SWAP_ACTIVATING_SIGTERM || state == SWAP_DEACTIVATING_SIGTERM) ? s->exec_context.kill_signal : SIGKILL; if (s->control_pid > 0) { if (kill(s->exec_context.kill_mode == KILL_PROCESS_GROUP ? -s->control_pid : 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->exec_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; if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, pid_set)) < 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); } } 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, true); return; fail: log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r)); swap_enter_dead(s, false); 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 if (s->from_etc_fstab) priority = s->parameters_etc_fstab.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", s->meta.id, strerror(-r)); swap_enter_dead(s, false); } static void swap_enter_deactivating(Swap *s, bool success) { int r; assert(s); if (!success) s->failure = true; 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", s->meta.id, strerror(-r)); swap_enter_active(s, false); } 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->failure = false; 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, true); 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, "failure", yes_no(s->failure)); 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, "failure")) { int b; if ((b = parse_boolean(value)) < 0) log_debug("Failed to parse failure value %s", value); else s->failure = b || s->failure; } 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_etc_fstab || s->from_proc_swaps; } static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { Swap *s = SWAP(u); bool success; assert(s); assert(pid >= 0); if (pid != s->control_pid) return; s->control_pid = 0; success = is_clean_exit(code, status); s->failure = s->failure || !success; if (s->control_command) { exec_status_exit(&s->control_command->exec_status, pid, code, status, s->exec_context.utmp_id); s->control_command = NULL; s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; } log_full(success ? LOG_DEBUG : LOG_NOTICE, "%s swap process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status); switch (s->state) { case SWAP_ACTIVATING: case SWAP_ACTIVATING_SIGTERM: case SWAP_ACTIVATING_SIGKILL: if (success) swap_enter_active(s, true); else swap_enter_dead(s, false); break; case SWAP_DEACTIVATING: case SWAP_DEACTIVATING_SIGKILL: case SWAP_DEACTIVATING_SIGTERM: if (success) swap_enter_dead(s, true); else swap_enter_dead(s, false); 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->meta.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->meta.id); swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, false); break; case SWAP_DEACTIVATING: log_warning("%s deactivation timed out. Stopping.", u->meta.id); swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, false); break; case SWAP_ACTIVATING_SIGTERM: log_warning("%s activation timed out. Killing.", u->meta.id); swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, false); break; case SWAP_DEACTIVATING_SIGTERM: log_warning("%s deactivation timed out. Killing.", u->meta.id); swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, false); break; case SWAP_ACTIVATING_SIGKILL: case SWAP_DEACTIVATING_SIGKILL: log_warning("%s swap process still around after SIGKILL. Ignoring.", u->meta.id); swap_enter_dead(s, false); 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) { Meta *meta; 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_per_type, meta, m->units_per_type[UNIT_SWAP]) { Swap *swap = (Swap*) meta; swap->is_active = swap->just_activated = false; } return 0; } manager_dispatch_load_queue(m); LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_SWAP]) { Swap *swap = (Swap*) meta; 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, true); 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, true); 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 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; 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; } /* We rely on mount.c to load /etc/fstab for us */ 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->failure = false; } static int swap_kill(Unit *u, KillWho who, KillMode mode, 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 -EINVAL; } if (s->control_pid <= 0 && who == KILL_CONTROL) { dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill"); return -ENOENT; } if (s->control_pid > 0) if (kill(mode == KILL_PROCESS_GROUP ? -s->control_pid : s->control_pid, signo) < 0) r = -errno; if (mode == KILL_CONTROL_GROUP) { int q; if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) return -ENOMEM; /* Exclude the control pid from being killed via the cgroup */ if (s->control_pid > 0) if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) { r = q; goto finish; } if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, pid_set)) < 0) if (r != -EAGAIN && r != -ESRCH && r != -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); const UnitVTable swap_vtable = { .suffix = ".swap", .no_alias = true, .no_instances = true, .no_isolate = true, .show_status = 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, .enumerate = swap_enumerate, .shutdown = swap_shutdown };