353 lines
9.2 KiB
C
353 lines
9.2 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
|
|
|
|
/***
|
|
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 <assert.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <signal.h>
|
|
#include <sys/mount.h>
|
|
|
|
#include <libcgroup.h>
|
|
|
|
#include "cgroup.h"
|
|
#include "cgroup-util.h"
|
|
#include "log.h"
|
|
|
|
int cgroup_bonding_realize(CGroupBonding *b) {
|
|
int r;
|
|
|
|
assert(b);
|
|
assert(b->path);
|
|
assert(b->controller);
|
|
|
|
if (b->realized)
|
|
return 0;
|
|
|
|
if ((r = cg_create(b->controller, b->path)) < 0)
|
|
return r;
|
|
|
|
b->realized = true;
|
|
|
|
if (b->only_us && b->clean_up)
|
|
cg_trim(b->controller, b->path, false);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cgroup_bonding_realize_list(CGroupBonding *first) {
|
|
CGroupBonding *b;
|
|
int r;
|
|
|
|
LIST_FOREACH(by_unit, b, first)
|
|
if ((r = cgroup_bonding_realize(b)) < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void cgroup_bonding_free(CGroupBonding *b) {
|
|
assert(b);
|
|
|
|
if (b->unit) {
|
|
CGroupBonding *f;
|
|
|
|
LIST_REMOVE(CGroupBonding, by_unit, b->unit->meta.cgroup_bondings, b);
|
|
|
|
assert_se(f = hashmap_get(b->unit->meta.manager->cgroup_bondings, b->path));
|
|
LIST_REMOVE(CGroupBonding, by_path, f, b);
|
|
|
|
if (f)
|
|
hashmap_replace(b->unit->meta.manager->cgroup_bondings, b->path, f);
|
|
else
|
|
hashmap_remove(b->unit->meta.manager->cgroup_bondings, b->path);
|
|
}
|
|
|
|
if (b->realized && b->only_us && b->clean_up) {
|
|
|
|
if (cgroup_bonding_is_empty(b) > 0)
|
|
cg_delete(b->controller, b->path);
|
|
else
|
|
cg_trim(b->controller, b->path, false);
|
|
}
|
|
|
|
free(b->controller);
|
|
free(b->path);
|
|
free(b);
|
|
}
|
|
|
|
void cgroup_bonding_free_list(CGroupBonding *first) {
|
|
CGroupBonding *b, *n;
|
|
|
|
LIST_FOREACH_SAFE(by_unit, b, n, first)
|
|
cgroup_bonding_free(b);
|
|
}
|
|
|
|
int cgroup_bonding_install(CGroupBonding *b, pid_t pid) {
|
|
int r;
|
|
|
|
assert(b);
|
|
assert(pid >= 0);
|
|
|
|
if ((r = cg_create_and_attach(b->controller, b->path, pid)) < 0)
|
|
return r;
|
|
|
|
b->realized = true;
|
|
return 0;
|
|
}
|
|
|
|
int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid) {
|
|
CGroupBonding *b;
|
|
int r;
|
|
|
|
LIST_FOREACH(by_unit, b, first)
|
|
if ((r = cgroup_bonding_install(b, pid)) < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cgroup_bonding_kill(CGroupBonding *b, int sig) {
|
|
int r;
|
|
|
|
assert(b);
|
|
assert(sig >= 0);
|
|
|
|
if ((r = cgroup_bonding_realize(b)) < 0)
|
|
return r;
|
|
|
|
assert(b->realized);
|
|
|
|
return cg_kill_recursive(b->controller, b->path, sig, true);
|
|
}
|
|
|
|
int cgroup_bonding_kill_list(CGroupBonding *first, int sig) {
|
|
CGroupBonding *b;
|
|
int r = -EAGAIN;
|
|
|
|
LIST_FOREACH(by_unit, b, first) {
|
|
if ((r = cgroup_bonding_kill(b, sig)) < 0) {
|
|
if (r == -EAGAIN || r == -ESRCH)
|
|
continue;
|
|
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we
|
|
* cannot know */
|
|
int cgroup_bonding_is_empty(CGroupBonding *b) {
|
|
int r;
|
|
|
|
assert(b);
|
|
|
|
if ((r = cg_is_empty_recursive(b->controller, b->path, true)) < 0)
|
|
return r;
|
|
|
|
/* If it is empty it is empty */
|
|
if (r > 0)
|
|
return 1;
|
|
|
|
/* It's not only us using this cgroup, so we just don't know */
|
|
return b->only_us ? 0 : -EAGAIN;
|
|
}
|
|
|
|
int cgroup_bonding_is_empty_list(CGroupBonding *first) {
|
|
CGroupBonding *b;
|
|
|
|
LIST_FOREACH(by_unit, b, first) {
|
|
int r;
|
|
|
|
if ((r = cgroup_bonding_is_empty(b)) < 0) {
|
|
/* If this returned -EAGAIN, then we don't know if the
|
|
* group is empty, so let's see if another group can
|
|
* tell us */
|
|
|
|
if (r != -EAGAIN)
|
|
return r;
|
|
} else
|
|
return r;
|
|
}
|
|
|
|
return -EAGAIN;
|
|
}
|
|
|
|
int manager_setup_cgroup(Manager *m) {
|
|
char *cp;
|
|
int r;
|
|
pid_t pid;
|
|
char suffix[32];
|
|
|
|
assert(m);
|
|
|
|
if ((r = cgroup_init()) != 0) {
|
|
log_error("Failed to initialize libcg: %s", cgroup_strerror(r));
|
|
return cg_translate_error(r, errno);
|
|
}
|
|
|
|
free(m->cgroup_controller);
|
|
if (!(m->cgroup_controller = strdup("name=systemd")))
|
|
return -ENOMEM;
|
|
|
|
free(m->cgroup_mount_point);
|
|
m->cgroup_mount_point = NULL;
|
|
if ((r = cgroup_get_subsys_mount_point(m->cgroup_controller, &m->cgroup_mount_point)))
|
|
return cg_translate_error(r, errno);
|
|
|
|
pid = getpid();
|
|
|
|
if ((r = cgroup_get_current_controller_path(pid, m->cgroup_controller, &cp)))
|
|
return cg_translate_error(r, errno);
|
|
|
|
snprintf(suffix, sizeof(suffix), "/systemd-%u", (unsigned) pid);
|
|
char_array_0(suffix);
|
|
|
|
free(m->cgroup_hierarchy);
|
|
|
|
if (endswith(cp, suffix))
|
|
/* We probably got reexecuted and can continue to use our root cgroup */
|
|
m->cgroup_hierarchy = cp;
|
|
else {
|
|
/* We need a new root cgroup */
|
|
|
|
m->cgroup_hierarchy = NULL;
|
|
r = asprintf(&m->cgroup_hierarchy, "%s%s", streq(cp, "/") ? "" : cp, suffix);
|
|
free(cp);
|
|
|
|
if (r < 0)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
log_debug("Using cgroup controller <%s>, hierarchy mounted at <%s>, using root group <%s>.",
|
|
m->cgroup_controller,
|
|
m->cgroup_mount_point,
|
|
m->cgroup_hierarchy);
|
|
|
|
if ((r = cg_install_release_agent(m->cgroup_controller, CGROUP_AGENT_PATH)) < 0)
|
|
log_warning("Failed to install release agent, ignoring: %s", strerror(-r));
|
|
else
|
|
log_debug("Installed release agent, or already installed.");
|
|
|
|
if ((r = cg_create_and_attach(m->cgroup_controller, m->cgroup_hierarchy, 0)) < 0)
|
|
log_error("Failed to create root cgroup hierarchy: %s", strerror(-r));
|
|
else
|
|
log_debug("Created root group.");
|
|
|
|
return r;
|
|
}
|
|
|
|
int manager_shutdown_cgroup(Manager *m) {
|
|
assert(m);
|
|
|
|
if (!m->cgroup_controller || !m->cgroup_hierarchy)
|
|
return 0;
|
|
|
|
return cg_delete(m->cgroup_controller, m->cgroup_hierarchy);
|
|
}
|
|
|
|
int cgroup_notify_empty(Manager *m, const char *group) {
|
|
CGroupBonding *l, *b;
|
|
|
|
assert(m);
|
|
assert(group);
|
|
|
|
if (!(l = hashmap_get(m->cgroup_bondings, group)))
|
|
return 0;
|
|
|
|
LIST_FOREACH(by_path, b, l) {
|
|
int t;
|
|
|
|
if (!b->unit)
|
|
continue;
|
|
|
|
if ((t = cgroup_bonding_is_empty_list(b)) < 0) {
|
|
|
|
/* If we don't know, we don't know */
|
|
if (t != -EAGAIN)
|
|
log_warning("Failed to check whether cgroup is empty: %s", strerror(errno));
|
|
|
|
continue;
|
|
}
|
|
|
|
if (t > 0)
|
|
if (UNIT_VTABLE(b->unit)->cgroup_notify_empty)
|
|
UNIT_VTABLE(b->unit)->cgroup_notify_empty(b->unit);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) {
|
|
CGroupBonding *l, *b;
|
|
char *group = NULL;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
if (pid <= 1)
|
|
return NULL;
|
|
|
|
if ((r = cg_get_by_pid(m->cgroup_controller, pid, &group)))
|
|
return NULL;
|
|
|
|
l = hashmap_get(m->cgroup_bondings, group);
|
|
free(group);
|
|
|
|
LIST_FOREACH(by_path, b, l) {
|
|
|
|
if (!b->unit)
|
|
continue;
|
|
|
|
if (b->only_us)
|
|
return b->unit;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
CGroupBonding *cgroup_bonding_find_list(CGroupBonding *first, const char *controller) {
|
|
CGroupBonding *b;
|
|
|
|
assert(controller);
|
|
|
|
LIST_FOREACH(by_unit, b, first)
|
|
if (streq(b->controller, controller))
|
|
return b;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
char *cgroup_bonding_to_string(CGroupBonding *b) {
|
|
char *r;
|
|
|
|
assert(b);
|
|
|
|
if (asprintf(&r, "%s:%s", b->controller, b->path) < 0)
|
|
return NULL;
|
|
|
|
return r;
|
|
}
|