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3a365ef697
When reconnecting to a domain we are validating the cgroup name.
In case of cgroup v2 we need to validate only the new format for host
without systemd '{machinename}.libvirt-{drivername}' or scope name
generated by systemd.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
157 lines
4.0 KiB
C
157 lines
4.0 KiB
C
/*
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* vircgroupv2.c: methods for cgroups v2 backend
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*
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* Copyright (C) 2018 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#ifdef __linux__
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# include <mntent.h>
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#endif /* __linux__ */
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#include "internal.h"
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#define __VIR_CGROUP_ALLOW_INCLUDE_PRIV_H__
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#include "vircgrouppriv.h"
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#undef __VIR_CGROUP_ALLOW_INCLUDE_PRIV_H__
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#include "vircgroup.h"
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#include "vircgroupbackend.h"
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#include "vircgroupv2.h"
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#include "virfile.h"
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#include "virlog.h"
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#include "virstring.h"
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#include "virsystemd.h"
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VIR_LOG_INIT("util.cgroup");
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#define VIR_FROM_THIS VIR_FROM_CGROUP
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VIR_ENUM_DECL(virCgroupV2Controller);
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VIR_ENUM_IMPL(virCgroupV2Controller, VIR_CGROUP_CONTROLLER_LAST,
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"cpu", "cpuacct", "cpuset", "memory", "devices",
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"freezer", "io", "net_cls", "perf_event", "name=systemd");
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#ifdef __linux__
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/* We're looking for one 'cgroup2' fs mount which has some
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* controllers enabled. */
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static bool
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virCgroupV2Available(void)
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{
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bool ret = false;
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FILE *mounts = NULL;
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struct mntent entry;
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char buf[CGROUP_MAX_VAL];
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if (!(mounts = fopen("/proc/mounts", "r")))
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return false;
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while (getmntent_r(mounts, &entry, buf, sizeof(buf)) != NULL) {
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VIR_AUTOFREE(char *) contFile = NULL;
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VIR_AUTOFREE(char *) contStr = NULL;
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if (STRNEQ(entry.mnt_type, "cgroup2"))
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continue;
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/* Systemd uses cgroup v2 for process tracking but no controller is
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* available. We should consider this configuration as cgroup v2 is
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* not available. */
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if (virAsprintf(&contFile, "%s/cgroup.controllers", entry.mnt_dir) < 0)
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goto cleanup;
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if (virFileReadAll(contFile, 1024 * 1024, &contStr) < 0)
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goto cleanup;
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if (STREQ(contStr, ""))
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continue;
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ret = true;
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break;
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}
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cleanup:
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VIR_FORCE_FCLOSE(mounts);
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return ret;
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}
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static bool
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virCgroupV2ValidateMachineGroup(virCgroupPtr group,
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const char *name ATTRIBUTE_UNUSED,
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const char *drivername,
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const char *machinename)
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{
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VIR_AUTOFREE(char *) partmachinename = NULL;
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VIR_AUTOFREE(char *) scopename = NULL;
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char *tmp;
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if (virAsprintf(&partmachinename, "%s.libvirt-%s", machinename,
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drivername) < 0) {
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return false;
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}
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if (virCgroupPartitionEscape(&partmachinename) < 0)
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return false;
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if (!(scopename = virSystemdMakeScopeName(machinename, drivername,
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false))) {
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return false;
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}
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if (virCgroupPartitionEscape(&scopename) < 0)
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return false;
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if (!(tmp = strrchr(group->unified.placement, '/')))
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return false;
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tmp++;
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if (STRNEQ(tmp, partmachinename) &&
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STRNEQ(tmp, scopename)) {
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VIR_DEBUG("Name '%s' for unified does not match '%s' or '%s'",
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tmp, partmachinename, scopename);
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return false;
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}
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return true;
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}
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virCgroupBackend virCgroupV2Backend = {
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.type = VIR_CGROUP_BACKEND_TYPE_V2,
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.available = virCgroupV2Available,
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.validateMachineGroup = virCgroupV2ValidateMachineGroup,
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};
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void
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virCgroupV2Register(void)
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{
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virCgroupBackendRegister(&virCgroupV2Backend);
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}
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#else /* !__linux__ */
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void
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virCgroupV2Register(void)
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{
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VIR_INFO("Control groups not supported on this platform");
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}
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#endif /* !__linux__ */
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