/* SPDX-License-Identifier: LGPL-2.1+ */ /*** This file is part of systemd. Copyright 2013 Lennart Poettering ***/ #include #include "alloc-util.h" #include "dbus-slice.h" #include "log.h" #include "slice.h" #include "special.h" #include "string-util.h" #include "strv.h" #include "unit-name.h" #include "unit.h" static const UnitActiveState state_translation_table[_SLICE_STATE_MAX] = { [SLICE_DEAD] = UNIT_INACTIVE, [SLICE_ACTIVE] = UNIT_ACTIVE }; static void slice_init(Unit *u) { assert(u); assert(u->load_state == UNIT_STUB); u->ignore_on_isolate = true; } static void slice_set_state(Slice *t, SliceState state) { SliceState old_state; assert(t); old_state = t->state; t->state = state; if (state != old_state) log_debug("%s changed %s -> %s", UNIT(t)->id, slice_state_to_string(old_state), slice_state_to_string(state)); unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], 0); } static int slice_add_parent_slice(Slice *s) { Unit *u = UNIT(s), *parent; _cleanup_free_ char *a = NULL; int r; assert(s); if (UNIT_ISSET(u->slice)) return 0; r = slice_build_parent_slice(u->id, &a); if (r <= 0) /* 0 means root slice */ return r; r = manager_load_unit(u->manager, a, NULL, NULL, &parent); if (r < 0) return r; unit_ref_set(&u->slice, u, parent); return 0; } static int slice_add_default_dependencies(Slice *s) { int r; assert(s); if (!UNIT(s)->default_dependencies) return 0; /* Make sure slices are unloaded on shutdown */ r = unit_add_two_dependencies_by_name( UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT); if (r < 0) return r; return 0; } static int slice_verify(Slice *s) { _cleanup_free_ char *parent = NULL; int r; assert(s); if (UNIT(s)->load_state != UNIT_LOADED) return 0; if (!slice_name_is_valid(UNIT(s)->id)) { log_unit_error(UNIT(s), "Slice name %s is not valid. Refusing.", UNIT(s)->id); return -ENOEXEC; } r = slice_build_parent_slice(UNIT(s)->id, &parent); if (r < 0) return log_unit_error_errno(UNIT(s), r, "Failed to determine parent slice: %m"); if (parent ? !unit_has_name(UNIT_DEREF(UNIT(s)->slice), parent) : UNIT_ISSET(UNIT(s)->slice)) { log_unit_error(UNIT(s), "Located outside of parent slice. Refusing."); return -ENOEXEC; } return 0; } static int slice_load_root_slice(Unit *u) { assert(u); if (!unit_has_name(u, SPECIAL_ROOT_SLICE)) return 0; u->perpetual = true; /* The root slice is a bit special. For example it is always running and cannot be terminated. Because of its * special semantics we synthesize it here, instead of relying on the unit file on disk. */ u->default_dependencies = false; if (!u->description) u->description = strdup("Root Slice"); if (!u->documentation) u->documentation = strv_new("man:systemd.special(7)", NULL); return 1; } static int slice_load_system_slice(Unit *u) { assert(u); if (!MANAGER_IS_SYSTEM(u->manager)) return 0; if (!unit_has_name(u, SPECIAL_SYSTEM_SLICE)) return 0; u->perpetual = true; /* The system slice is a bit special. For example it is always running and cannot be terminated. Because of its * special semantics we synthesize it here, instead of relying on the unit file on disk. */ u->default_dependencies = false; if (!u->description) u->description = strdup("System Slice"); if (!u->documentation) u->documentation = strv_new("man:systemd.special(7)", NULL); return 1; } static int slice_load(Unit *u) { Slice *s = SLICE(u); int r; assert(s); assert(u->load_state == UNIT_STUB); r = slice_load_root_slice(u); if (r < 0) return r; r = slice_load_system_slice(u); if (r < 0) return r; r = unit_load_fragment_and_dropin_optional(u); if (r < 0) return r; /* This is a new unit? Then let's add in some extras */ if (u->load_state == UNIT_LOADED) { r = unit_patch_contexts(u); if (r < 0) return r; r = slice_add_parent_slice(s); if (r < 0) return r; r = slice_add_default_dependencies(s); if (r < 0) return r; } return slice_verify(s); } static int slice_coldplug(Unit *u) { Slice *t = SLICE(u); assert(t); assert(t->state == SLICE_DEAD); if (t->deserialized_state != t->state) slice_set_state(t, t->deserialized_state); return 0; } static void slice_dump(Unit *u, FILE *f, const char *prefix) { Slice *t = SLICE(u); assert(t); assert(f); fprintf(f, "%sSlice State: %s\n", prefix, slice_state_to_string(t->state)); cgroup_context_dump(&t->cgroup_context, f, prefix); } static int slice_start(Unit *u) { Slice *t = SLICE(u); int r; assert(t); assert(t->state == SLICE_DEAD); r = unit_acquire_invocation_id(u); if (r < 0) return r; (void) unit_realize_cgroup(u); (void) unit_reset_cpu_accounting(u); (void) unit_reset_ip_accounting(u); slice_set_state(t, SLICE_ACTIVE); return 1; } static int slice_stop(Unit *u) { Slice *t = SLICE(u); assert(t); assert(t->state == SLICE_ACTIVE); /* We do not need to destroy the cgroup explicitly, * unit_notify() will do that for us anyway. */ slice_set_state(t, SLICE_DEAD); return 1; } static int slice_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { return unit_kill_common(u, who, signo, -1, -1, error); } static int slice_serialize(Unit *u, FILE *f, FDSet *fds) { Slice *s = SLICE(u); assert(s); assert(f); assert(fds); unit_serialize_item(u, f, "state", slice_state_to_string(s->state)); return 0; } static int slice_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { Slice *s = SLICE(u); assert(u); assert(key); assert(value); assert(fds); if (streq(key, "state")) { SliceState state; state = slice_state_from_string(value); if (state < 0) log_debug("Failed to parse state value %s", value); else s->deserialized_state = state; } else log_debug("Unknown serialization key '%s'", key); return 0; } _pure_ static UnitActiveState slice_active_state(Unit *u) { assert(u); return state_translation_table[SLICE(u)->state]; } _pure_ static const char *slice_sub_state_to_string(Unit *u) { assert(u); return slice_state_to_string(SLICE(u)->state); } static int slice_make_perpetual(Manager *m, const char *name, Unit **ret) { Unit *u; int r; assert(m); assert(name); u = manager_get_unit(m, name); if (!u) { r = unit_new_for_name(m, sizeof(Slice), name, &u); if (r < 0) return log_error_errno(r, "Failed to allocate the special %s unit: %m", name); } u->perpetual = true; SLICE(u)->deserialized_state = SLICE_ACTIVE; unit_add_to_load_queue(u); unit_add_to_dbus_queue(u); if (ret) *ret = u; return 0; } static void slice_enumerate_perpetual(Manager *m) { Unit *u; int r; assert(m); r = slice_make_perpetual(m, SPECIAL_ROOT_SLICE, &u); if (r >= 0 && manager_owns_root_cgroup(m)) { Slice *s = SLICE(u); /* If we are managing the root cgroup then this means our root slice covers the whole system, which * means the kernel will track CPU/tasks/memory for us anyway, and it is all available in /proc. Let's * hence turn accounting on here, so that our APIs to query this data are available. */ s->cgroup_context.cpu_accounting = true; s->cgroup_context.tasks_accounting = true; s->cgroup_context.memory_accounting = true; } if (MANAGER_IS_SYSTEM(m)) (void) slice_make_perpetual(m, SPECIAL_SYSTEM_SLICE, NULL); } const UnitVTable slice_vtable = { .object_size = sizeof(Slice), .cgroup_context_offset = offsetof(Slice, cgroup_context), .sections = "Unit\0" "Slice\0" "Install\0", .private_section = "Slice", .can_transient = true, .init = slice_init, .load = slice_load, .coldplug = slice_coldplug, .dump = slice_dump, .start = slice_start, .stop = slice_stop, .kill = slice_kill, .serialize = slice_serialize, .deserialize_item = slice_deserialize_item, .active_state = slice_active_state, .sub_state_to_string = slice_sub_state_to_string, .bus_vtable = bus_slice_vtable, .bus_set_property = bus_slice_set_property, .bus_commit_properties = bus_slice_commit_properties, .enumerate_perpetual = slice_enumerate_perpetual, .status_message_formats = { .finished_start_job = { [JOB_DONE] = "Created slice %s.", }, .finished_stop_job = { [JOB_DONE] = "Removed slice %s.", }, }, };