352 lines
9.0 KiB
C
352 lines
9.0 KiB
C
/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include "alloc-util.h"
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#include "dbus-slice.h"
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#include "log.h"
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#include "slice.h"
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#include "special.h"
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#include "string-util.h"
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#include "strv.h"
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#include "unit-name.h"
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#include "unit.h"
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static const UnitActiveState state_translation_table[_SLICE_STATE_MAX] = {
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[SLICE_DEAD] = UNIT_INACTIVE,
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[SLICE_ACTIVE] = UNIT_ACTIVE
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};
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static void slice_init(Unit *u) {
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assert(u);
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assert(u->load_state == UNIT_STUB);
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u->ignore_on_isolate = true;
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}
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static void slice_set_state(Slice *t, SliceState state) {
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SliceState old_state;
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assert(t);
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old_state = t->state;
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t->state = state;
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if (state != old_state)
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log_debug("%s changed %s -> %s",
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UNIT(t)->id,
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slice_state_to_string(old_state),
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slice_state_to_string(state));
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unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], true);
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}
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static int slice_add_parent_slice(Slice *s) {
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char *a, *dash;
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Unit *parent;
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int r;
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assert(s);
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if (UNIT_ISSET(UNIT(s)->slice))
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return 0;
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if (unit_has_name(UNIT(s), SPECIAL_ROOT_SLICE))
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return 0;
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a = strdupa(UNIT(s)->id);
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dash = strrchr(a, '-');
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if (dash)
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strcpy(dash, ".slice");
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else
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a = (char*) SPECIAL_ROOT_SLICE;
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r = manager_load_unit(UNIT(s)->manager, a, NULL, NULL, &parent);
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if (r < 0)
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return r;
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unit_ref_set(&UNIT(s)->slice, parent);
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return 0;
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}
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static int slice_add_default_dependencies(Slice *s) {
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int r;
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assert(s);
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if (!UNIT(s)->default_dependencies)
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return 0;
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/* Make sure slices are unloaded on shutdown */
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r = unit_add_two_dependencies_by_name(
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UNIT(s),
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UNIT_BEFORE, UNIT_CONFLICTS,
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SPECIAL_SHUTDOWN_TARGET, NULL, true);
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if (r < 0)
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return r;
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return 0;
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}
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static int slice_verify(Slice *s) {
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_cleanup_free_ char *parent = NULL;
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int r;
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assert(s);
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if (UNIT(s)->load_state != UNIT_LOADED)
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return 0;
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if (!slice_name_is_valid(UNIT(s)->id)) {
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log_unit_error(UNIT(s), "Slice name %s is not valid. Refusing.", UNIT(s)->id);
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return -EINVAL;
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}
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r = slice_build_parent_slice(UNIT(s)->id, &parent);
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if (r < 0)
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return log_unit_error_errno(UNIT(s), r, "Failed to determine parent slice: %m");
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if (parent ? !unit_has_name(UNIT_DEREF(UNIT(s)->slice), parent) : UNIT_ISSET(UNIT(s)->slice)) {
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log_unit_error(UNIT(s), "Located outside of parent slice. Refusing.");
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return -EINVAL;
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}
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return 0;
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}
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static int slice_load(Unit *u) {
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Slice *s = SLICE(u);
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int r;
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assert(s);
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assert(u->load_state == UNIT_STUB);
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r = unit_load_fragment_and_dropin_optional(u);
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if (r < 0)
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return r;
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/* This is a new unit? Then let's add in some extras */
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if (u->load_state == UNIT_LOADED) {
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r = unit_patch_contexts(u);
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if (r < 0)
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return r;
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r = slice_add_parent_slice(s);
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if (r < 0)
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return r;
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r = slice_add_default_dependencies(s);
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if (r < 0)
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return r;
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}
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return slice_verify(s);
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}
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static int slice_coldplug(Unit *u) {
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Slice *t = SLICE(u);
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assert(t);
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assert(t->state == SLICE_DEAD);
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if (t->deserialized_state != t->state)
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slice_set_state(t, t->deserialized_state);
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return 0;
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}
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static void slice_dump(Unit *u, FILE *f, const char *prefix) {
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Slice *t = SLICE(u);
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assert(t);
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assert(f);
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fprintf(f,
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"%sSlice State: %s\n",
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prefix, slice_state_to_string(t->state));
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cgroup_context_dump(&t->cgroup_context, f, prefix);
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}
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static int slice_start(Unit *u) {
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Slice *t = SLICE(u);
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int r;
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assert(t);
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assert(t->state == SLICE_DEAD);
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r = unit_acquire_invocation_id(u);
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if (r < 0)
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return r;
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(void) unit_realize_cgroup(u);
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(void) unit_reset_cpu_usage(u);
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slice_set_state(t, SLICE_ACTIVE);
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return 1;
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}
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static int slice_stop(Unit *u) {
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Slice *t = SLICE(u);
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assert(t);
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assert(t->state == SLICE_ACTIVE);
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/* We do not need to destroy the cgroup explicitly,
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* unit_notify() will do that for us anyway. */
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slice_set_state(t, SLICE_DEAD);
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return 1;
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}
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static int slice_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
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return unit_kill_common(u, who, signo, -1, -1, error);
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}
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static int slice_serialize(Unit *u, FILE *f, FDSet *fds) {
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Slice *s = SLICE(u);
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assert(s);
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assert(f);
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assert(fds);
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unit_serialize_item(u, f, "state", slice_state_to_string(s->state));
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return 0;
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}
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static int slice_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
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Slice *s = SLICE(u);
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assert(u);
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assert(key);
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assert(value);
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assert(fds);
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if (streq(key, "state")) {
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SliceState state;
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state = slice_state_from_string(value);
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if (state < 0)
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log_debug("Failed to parse state value %s", value);
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else
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s->deserialized_state = state;
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} else
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log_debug("Unknown serialization key '%s'", key);
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return 0;
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}
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_pure_ static UnitActiveState slice_active_state(Unit *u) {
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assert(u);
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return state_translation_table[SLICE(u)->state];
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}
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_pure_ static const char *slice_sub_state_to_string(Unit *u) {
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assert(u);
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return slice_state_to_string(SLICE(u)->state);
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}
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static void slice_enumerate(Manager *m) {
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Unit *u;
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int r;
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assert(m);
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u = manager_get_unit(m, SPECIAL_ROOT_SLICE);
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if (!u) {
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u = unit_new(m, sizeof(Slice));
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if (!u) {
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log_oom();
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return;
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}
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r = unit_add_name(u, SPECIAL_ROOT_SLICE);
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if (r < 0) {
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unit_free(u);
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log_error_errno(r, "Failed to add -.slice name");
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return;
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}
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}
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u->default_dependencies = false;
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u->no_gc = true;
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u->ignore_on_isolate = true;
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u->refuse_manual_start = true;
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u->refuse_manual_stop = true;
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SLICE(u)->deserialized_state = SLICE_ACTIVE;
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if (!u->description)
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u->description = strdup("Root Slice");
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if (!u->documentation)
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(void) strv_extend(&u->documentation, "man:systemd.special(7)");
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unit_add_to_load_queue(u);
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unit_add_to_dbus_queue(u);
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}
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const UnitVTable slice_vtable = {
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.object_size = sizeof(Slice),
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.cgroup_context_offset = offsetof(Slice, cgroup_context),
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.sections =
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"Unit\0"
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"Slice\0"
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"Install\0",
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.private_section = "Slice",
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.can_transient = true,
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.init = slice_init,
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.load = slice_load,
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.coldplug = slice_coldplug,
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.dump = slice_dump,
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.start = slice_start,
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.stop = slice_stop,
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.kill = slice_kill,
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.serialize = slice_serialize,
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.deserialize_item = slice_deserialize_item,
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.active_state = slice_active_state,
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.sub_state_to_string = slice_sub_state_to_string,
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.bus_vtable = bus_slice_vtable,
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.bus_set_property = bus_slice_set_property,
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.bus_commit_properties = bus_slice_commit_properties,
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.enumerate = slice_enumerate,
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.status_message_formats = {
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.finished_start_job = {
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[JOB_DONE] = "Created slice %s.",
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},
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.finished_stop_job = {
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[JOB_DONE] = "Removed slice %s.",
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},
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},
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};
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