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/*
* vircgroupbackend.c: methods for cgroups backend
*
* Copyright (C) 2018 Red Hat, Inc.
*
* This library 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.
*
* This library 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 this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include "vircgroupbackend.h"
#define LIBVIRT_VIRCGROUPPRIV_H_ALLOW
#include "vircgrouppriv.h"
#include "vircgroupv1.h"
#include "vircgroupv2.h"
#include "virerror.h"
#include "virthread.h"
#define VIR_FROM_THIS VIR_FROM_CGROUP
VIR_ENUM_IMPL(virCgroupBackend,
VIR_CGROUP_BACKEND_TYPE_LAST,
"cgroup V2",
"cgroup V1",
);
static virOnceControl virCgroupBackendOnce = VIR_ONCE_CONTROL_INITIALIZER;
static virCgroupBackend *virCgroupBackends[VIR_CGROUP_BACKEND_TYPE_LAST] = { 0 };
void
virCgroupBackendRegister(virCgroupBackend *backend)
{
if (virCgroupBackends[backend->type]) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Cgroup backend '%1$s' already registered."),
virCgroupBackendTypeToString(backend->type));
return;
}
virCgroupBackends[backend->type] = backend;
}
static void
virCgroupBackendOnceInit(void)
{
virCgroupV2Register();
virCgroupV1Register();
}
virCgroupBackend **
virCgroupBackendGetAll(void)
{
if (virOnce(&virCgroupBackendOnce, virCgroupBackendOnceInit) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Failed to initialize cgroup backend."));
return NULL;
}
return virCgroupBackends;
}
virCgroupBackend *
virCgroupBackendForController(virCgroup *group,
unsigned int controller)
{
size_t i;
for (i = 0; i < VIR_CGROUP_BACKEND_TYPE_LAST; i++) {
if (group->backends[i] &&
group->backends[i]->hasController(group, controller)) {
return group->backends[i];
}
}
return NULL;
}
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