2018-08-17 08:19:59 +00:00
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/*
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* vircgroupv1.c: methods for cgroups v1 backend
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*
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* Copyright (C) 2010-2015,2018 Red Hat, Inc.
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* Copyright IBM Corp. 2008
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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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2018-09-13 14:27:56 +00:00
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#if defined HAVE_MNTENT_H && defined HAVE_GETMNTENT_R
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# include <mntent.h>
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#endif
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2018-09-14 10:51:27 +00:00
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#include <sys/stat.h>
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2018-09-13 14:27:56 +00:00
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2018-08-17 08:19:59 +00:00
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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 "vircgroupv1.h"
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2018-09-13 14:27:56 +00:00
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#include "virfile.h"
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2018-08-17 08:19:59 +00:00
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#include "virlog.h"
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2018-09-14 11:21:19 +00:00
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#include "virstring.h"
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#include "virsystemd.h"
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2018-09-14 10:51:27 +00:00
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#include "virerror.h"
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2018-08-17 08:19:59 +00:00
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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(virCgroupV1Controller);
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VIR_ENUM_IMPL(virCgroupV1Controller, VIR_CGROUP_CONTROLLER_LAST,
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"cpu", "cpuacct", "cpuset", "memory", "devices",
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"freezer", "blkio", "net_cls", "perf_event",
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"name=systemd");
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2018-09-13 14:27:56 +00:00
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/* We're looking for at least one 'cgroup' fs mount,
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* which is *not* a named mount. */
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static bool
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virCgroupV1Available(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 (!virFileExists("/proc/cgroups"))
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return false;
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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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if (STREQ(entry.mnt_type, "cgroup") && !strstr(entry.mnt_opts, "name=")) {
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ret = true;
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break;
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}
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}
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VIR_FORCE_FCLOSE(mounts);
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return ret;
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}
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2018-09-14 11:21:19 +00:00
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static bool
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virCgroupV1ValidateMachineGroup(virCgroupPtr group,
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const char *name,
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const char *drivername,
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const char *machinename)
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{
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size_t i;
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VIR_AUTOFREE(char *) partname = NULL;
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VIR_AUTOFREE(char *) scopename_old = NULL;
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VIR_AUTOFREE(char *) scopename_new = NULL;
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VIR_AUTOFREE(char *) partmachinename = NULL;
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if (virAsprintf(&partname, "%s.libvirt-%s",
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name, drivername) < 0)
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return false;
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if (virCgroupPartitionEscape(&partname) < 0)
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return false;
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if (virAsprintf(&partmachinename, "%s.libvirt-%s",
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machinename, drivername) < 0 ||
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virCgroupPartitionEscape(&partmachinename) < 0)
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return false;
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if (!(scopename_old = virSystemdMakeScopeName(name, drivername, true)))
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return false;
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if (!(scopename_new = virSystemdMakeScopeName(machinename,
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drivername, false)))
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return false;
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if (virCgroupPartitionEscape(&scopename_old) < 0)
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return false;
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if (virCgroupPartitionEscape(&scopename_new) < 0)
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return false;
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for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
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char *tmp;
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if (i == VIR_CGROUP_CONTROLLER_SYSTEMD)
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continue;
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if (!group->controllers[i].placement)
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continue;
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tmp = strrchr(group->controllers[i].placement, '/');
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if (!tmp)
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return false;
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if (i == VIR_CGROUP_CONTROLLER_CPU ||
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i == VIR_CGROUP_CONTROLLER_CPUACCT ||
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i == VIR_CGROUP_CONTROLLER_CPUSET) {
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if (STREQ(tmp, "/emulator"))
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*tmp = '\0';
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tmp = strrchr(group->controllers[i].placement, '/');
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if (!tmp)
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return false;
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}
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tmp++;
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if (STRNEQ(tmp, name) &&
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STRNEQ(tmp, machinename) &&
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STRNEQ(tmp, partname) &&
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STRNEQ(tmp, partmachinename) &&
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STRNEQ(tmp, scopename_old) &&
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STRNEQ(tmp, scopename_new)) {
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VIR_DEBUG("Name '%s' for controller '%s' does not match "
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"'%s', '%s', '%s', '%s' or '%s'",
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tmp, virCgroupV1ControllerTypeToString(i),
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name, machinename, partname,
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scopename_old, scopename_new);
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return false;
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}
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}
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return true;
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}
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2018-08-17 07:46:10 +00:00
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static int
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virCgroupV1CopyMounts(virCgroupPtr group,
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virCgroupPtr parent)
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{
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size_t i;
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for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
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if (!parent->controllers[i].mountPoint)
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continue;
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if (VIR_STRDUP(group->controllers[i].mountPoint,
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parent->controllers[i].mountPoint) < 0)
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return -1;
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if (VIR_STRDUP(group->controllers[i].linkPoint,
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parent->controllers[i].linkPoint) < 0)
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return -1;
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}
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return 0;
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}
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2018-09-14 10:53:47 +00:00
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static int
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virCgroupV1CopyPlacement(virCgroupPtr group,
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const char *path,
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virCgroupPtr parent)
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{
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size_t i;
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for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
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if (!group->controllers[i].mountPoint)
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continue;
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if (i == VIR_CGROUP_CONTROLLER_SYSTEMD)
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continue;
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if (path[0] == '/') {
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if (VIR_STRDUP(group->controllers[i].placement, path) < 0)
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return -1;
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} else {
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/*
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* parent == "/" + path="" => "/"
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* parent == "/libvirt.service" + path == "" => "/libvirt.service"
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* parent == "/libvirt.service" + path == "foo" => "/libvirt.service/foo"
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*/
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if (virAsprintf(&group->controllers[i].placement,
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"%s%s%s",
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parent->controllers[i].placement,
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(STREQ(parent->controllers[i].placement, "/") ||
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STREQ(path, "") ? "" : "/"),
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path) < 0)
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return -1;
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}
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}
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return 0;
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}
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2018-09-14 10:51:27 +00:00
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static int
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virCgroupV1ResolveMountLink(const char *mntDir,
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const char *typeStr,
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virCgroupControllerPtr controller)
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{
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VIR_AUTOFREE(char *) linkSrc = NULL;
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VIR_AUTOFREE(char *) tmp = NULL;
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char *dirName;
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struct stat sb;
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if (VIR_STRDUP(tmp, mntDir) < 0)
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return -1;
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dirName = strrchr(tmp, '/');
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if (!dirName) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Missing '/' separator in cgroup mount '%s'"), tmp);
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return -1;
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}
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if (!strchr(dirName + 1, ','))
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return 0;
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*dirName = '\0';
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if (virAsprintf(&linkSrc, "%s/%s", tmp, typeStr) < 0)
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return -1;
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*dirName = '/';
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if (lstat(linkSrc, &sb) < 0) {
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if (errno == ENOENT) {
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VIR_WARN("Controller %s co-mounted at %s is missing symlink at %s",
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typeStr, tmp, linkSrc);
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} else {
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virReportSystemError(errno, _("Cannot stat %s"), linkSrc);
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return -1;
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}
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} else {
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if (!S_ISLNK(sb.st_mode)) {
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VIR_WARN("Expecting a symlink at %s for controller %s",
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linkSrc, typeStr);
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} else {
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VIR_STEAL_PTR(controller->linkPoint, linkSrc);
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}
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}
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return 0;
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}
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static bool
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virCgroupV1MountOptsMatchController(const char *mntOpts,
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const char *typeStr)
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{
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const char *tmp = mntOpts;
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int typeLen = strlen(typeStr);
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while (tmp) {
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const char *next = strchr(tmp, ',');
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int len;
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if (next) {
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len = next - tmp;
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next++;
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} else {
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len = strlen(tmp);
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}
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if (typeLen == len && STREQLEN(typeStr, tmp, len))
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return true;
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tmp = next;
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}
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return false;
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}
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static int
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virCgroupV1DetectMounts(virCgroupPtr group,
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const char *mntType,
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const char *mntOpts,
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const char *mntDir)
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{
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size_t i;
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if (STRNEQ(mntType, "cgroup"))
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return 0;
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for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
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const char *typestr = virCgroupV1ControllerTypeToString(i);
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if (virCgroupV1MountOptsMatchController(mntOpts, typestr)) {
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/* Note that the lines in /proc/mounts have the same
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* order than the mount operations, and that there may
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* be duplicates due to bind mounts. This means
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* that the same mount point may be processed more than
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* once. We need to save the results of the last one,
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* and we need to be careful to release the memory used
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* by previous processing. */
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virCgroupControllerPtr controller = &group->controllers[i];
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VIR_FREE(controller->mountPoint);
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VIR_FREE(controller->linkPoint);
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if (VIR_STRDUP(controller->mountPoint, mntDir) < 0)
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return -1;
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/* If it is a co-mount it has a filename like "cpu,cpuacct"
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* and we must identify the symlink path */
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if (virCgroupV1ResolveMountLink(mntDir, typestr, controller) < 0)
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return -1;
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}
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}
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return 0;
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}
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static int
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virCgroupV1DetectPlacement(virCgroupPtr group,
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const char *path,
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const char *controllers,
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const char *selfpath)
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{
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size_t i;
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for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
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const char *typestr = virCgroupV1ControllerTypeToString(i);
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if (virCgroupV1MountOptsMatchController(controllers, typestr) &&
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group->controllers[i].mountPoint != NULL &&
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group->controllers[i].placement == NULL) {
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/*
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* selfpath == "/" + path="" -> "/"
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* selfpath == "/libvirt.service" + path == "" -> "/libvirt.service"
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* selfpath == "/libvirt.service" + path == "foo" -> "/libvirt.service/foo"
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*/
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if (i == VIR_CGROUP_CONTROLLER_SYSTEMD) {
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if (VIR_STRDUP(group->controllers[i].placement,
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selfpath) < 0)
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return -1;
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} else {
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if (virAsprintf(&group->controllers[i].placement,
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"%s%s%s", selfpath,
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(STREQ(selfpath, "/") ||
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STREQ(path, "") ? "" : "/"),
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path) < 0)
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return -1;
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}
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}
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}
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return 0;
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}
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2018-08-24 13:15:23 +00:00
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static int
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|
|
virCgroupV1ValidatePlacement(virCgroupPtr group,
|
|
|
|
pid_t pid)
|
|
|
|
{
|
|
|
|
size_t i;
|
|
|
|
|
|
|
|
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
|
|
|
|
if (!group->controllers[i].mountPoint)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (!group->controllers[i].placement) {
|
|
|
|
virReportError(VIR_ERR_INTERNAL_ERROR,
|
|
|
|
_("Could not find placement for v1 controller %s at %s"),
|
|
|
|
virCgroupV1ControllerTypeToString(i),
|
|
|
|
group->controllers[i].placement);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
VIR_DEBUG("Detected mount/mapping %zu:%s at %s in %s for pid %lld",
|
|
|
|
i,
|
|
|
|
virCgroupV1ControllerTypeToString(i),
|
|
|
|
group->controllers[i].mountPoint,
|
|
|
|
group->controllers[i].placement,
|
|
|
|
(long long) pid);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2018-08-17 10:00:29 +00:00
|
|
|
static char *
|
|
|
|
virCgroupV1StealPlacement(virCgroupPtr group)
|
|
|
|
{
|
|
|
|
char *ret = NULL;
|
|
|
|
|
|
|
|
VIR_STEAL_PTR(ret, group->controllers[VIR_CGROUP_CONTROLLER_SYSTEMD].placement);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2018-09-24 23:12:22 +00:00
|
|
|
static int
|
|
|
|
virCgroupV1DetectControllers(virCgroupPtr group,
|
|
|
|
int controllers)
|
|
|
|
{
|
|
|
|
size_t i;
|
|
|
|
size_t j;
|
|
|
|
|
|
|
|
if (controllers >= 0) {
|
|
|
|
VIR_DEBUG("Filtering controllers %d", controllers);
|
|
|
|
/* First mark requested but non-existing controllers to be ignored */
|
|
|
|
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
|
|
|
|
if (((1 << i) & controllers)) {
|
|
|
|
/* Remove non-existent controllers */
|
|
|
|
if (!group->controllers[i].mountPoint) {
|
|
|
|
VIR_DEBUG("Requested controller '%s' not mounted, ignoring",
|
|
|
|
virCgroupV1ControllerTypeToString(i));
|
|
|
|
controllers &= ~(1 << i);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
|
|
|
|
VIR_DEBUG("Controller '%s' wanted=%s, mount='%s'",
|
|
|
|
virCgroupV1ControllerTypeToString(i),
|
|
|
|
(1 << i) & controllers ? "yes" : "no",
|
|
|
|
NULLSTR(group->controllers[i].mountPoint));
|
|
|
|
if (!((1 << i) & controllers) &&
|
|
|
|
group->controllers[i].mountPoint) {
|
|
|
|
/* Check whether a request to disable a controller
|
|
|
|
* clashes with co-mounting of controllers */
|
|
|
|
for (j = 0; j < VIR_CGROUP_CONTROLLER_LAST; j++) {
|
|
|
|
if (j == i)
|
|
|
|
continue;
|
|
|
|
if (!((1 << j) & controllers))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (STREQ_NULLABLE(group->controllers[i].mountPoint,
|
|
|
|
group->controllers[j].mountPoint)) {
|
|
|
|
virReportSystemError(EINVAL,
|
|
|
|
_("V1 controller '%s' is not wanted, but '%s' is co-mounted"),
|
|
|
|
virCgroupV1ControllerTypeToString(i),
|
|
|
|
virCgroupV1ControllerTypeToString(j));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
VIR_FREE(group->controllers[i].mountPoint);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
VIR_DEBUG("Auto-detecting controllers");
|
|
|
|
controllers = 0;
|
|
|
|
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
|
|
|
|
VIR_DEBUG("Controller '%s' present=%s",
|
|
|
|
virCgroupV1ControllerTypeToString(i),
|
|
|
|
group->controllers[i].mountPoint ? "yes" : "no");
|
|
|
|
if (group->controllers[i].mountPoint == NULL)
|
|
|
|
continue;
|
|
|
|
controllers |= (1 << i);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return controllers;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2018-08-19 17:17:27 +00:00
|
|
|
static bool
|
|
|
|
virCgroupV1HasController(virCgroupPtr group,
|
|
|
|
int controller)
|
|
|
|
{
|
|
|
|
return group->controllers[controller].mountPoint != NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2018-08-19 17:20:25 +00:00
|
|
|
static int
|
|
|
|
virCgroupV1GetAnyController(virCgroupPtr group)
|
|
|
|
{
|
|
|
|
size_t i;
|
|
|
|
|
|
|
|
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
|
|
|
|
/* Reject any controller with a placement
|
|
|
|
* of '/' to avoid doing bad stuff to the root
|
|
|
|
* cgroup
|
|
|
|
*/
|
|
|
|
if (group->controllers[i].mountPoint &&
|
|
|
|
group->controllers[i].placement &&
|
|
|
|
STRNEQ(group->controllers[i].placement, "/")) {
|
|
|
|
return i;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2018-08-17 08:19:59 +00:00
|
|
|
virCgroupBackend virCgroupV1Backend = {
|
|
|
|
.type = VIR_CGROUP_BACKEND_TYPE_V1,
|
2018-09-13 14:27:56 +00:00
|
|
|
|
|
|
|
.available = virCgroupV1Available,
|
2018-09-14 11:21:19 +00:00
|
|
|
.validateMachineGroup = virCgroupV1ValidateMachineGroup,
|
2018-08-17 07:46:10 +00:00
|
|
|
.copyMounts = virCgroupV1CopyMounts,
|
2018-09-14 10:53:47 +00:00
|
|
|
.copyPlacement = virCgroupV1CopyPlacement,
|
2018-09-14 10:51:27 +00:00
|
|
|
.detectMounts = virCgroupV1DetectMounts,
|
|
|
|
.detectPlacement = virCgroupV1DetectPlacement,
|
2018-08-24 13:15:23 +00:00
|
|
|
.validatePlacement = virCgroupV1ValidatePlacement,
|
2018-08-17 10:00:29 +00:00
|
|
|
.stealPlacement = virCgroupV1StealPlacement,
|
2018-09-24 23:12:22 +00:00
|
|
|
.detectControllers = virCgroupV1DetectControllers,
|
2018-08-19 17:17:27 +00:00
|
|
|
.hasController = virCgroupV1HasController,
|
2018-08-19 17:20:25 +00:00
|
|
|
.getAnyController = virCgroupV1GetAnyController,
|
2018-08-17 08:19:59 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
virCgroupV1Register(void)
|
|
|
|
{
|
|
|
|
virCgroupBackendRegister(&virCgroupV1Backend);
|
|
|
|
}
|