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libvirt/src/util/vircgroupv1.c
Scott Davis 8833b42f3b vircgroupv1: fix null string specifier argument in virCgroupV1ValidatePlacement 
Detected by gcc 11 -Wformat-overflow:
../../src/util/vircgroupv1.c: In function ‘virCgroupV1ValidatePlacement’:
../../src/util/virerror.h:176:5: warning: ‘%s’ directive argument is null [-Wformat-overflow=]
  176 |     virReportErrorHelper(VIR_FROM_THIS, code, __FILE__, \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  177 |                          __FUNCTION__, __LINE__, __VA_ARGS__)
      |                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../src/util/vircgroupv1.c:411:13: note: in expansion of macro ‘virReportError’
  411 |             virReportError(VIR_ERR_INTERNAL_ERROR,
      |             ^~~~~~~~~~~~~~
../../src/util/vircgroupv1.c:412:80: note: format string is defined here
  412 |                            _("Could not find placement for v1 controller %s at %s"),
      |                                                                                ^~

Signed-off-by: Scott Davis <scott.davis@starlab.io>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
2022-05-26 10:14:49 +02:00

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/*
* vircgroupv1.c: methods for cgroups v1 backend
*
* Copyright (C) 2010-2015,2018 Red Hat, Inc.
* Copyright IBM Corp. 2008
*
* 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 <unistd.h>
#ifdef __linux__
# include <mntent.h>
# include <sys/stat.h>
# include <sys/mount.h>
#endif /* __linux__ */
#include "internal.h"
#define LIBVIRT_VIRCGROUPPRIV_H_ALLOW
#include "vircgrouppriv.h"
#include "vircgroup.h"
#include "vircgroupbackend.h"
#include "vircgroupv1.h"
#include "virfile.h"
#include "virlog.h"
#include "virstring.h"
#include "virsystemd.h"
#include "virerror.h"
#include "viralloc.h"
#include "virthread.h"
VIR_LOG_INIT("util.cgroup");
#define VIR_FROM_THIS VIR_FROM_CGROUP
VIR_ENUM_DECL(virCgroupV1Controller);
VIR_ENUM_IMPL(virCgroupV1Controller,
VIR_CGROUP_CONTROLLER_LAST,
"cpu", "cpuacct", "cpuset", "memory", "devices",
"freezer", "blkio", "net_cls", "perf_event",
"name=systemd",
);
#ifdef __linux__
/* We're looking for at least one 'cgroup' fs mount,
* which is *not* a named mount. */
static bool
virCgroupV1Available(void)
{
bool ret = false;
FILE *mounts = NULL;
struct mntent entry;
char buf[CGROUP_MAX_VAL];
if (!virFileExists("/proc/cgroups"))
return false;
if (!(mounts = fopen("/proc/mounts", "r")))
return false;
while (getmntent_r(mounts, &entry, buf, sizeof(buf)) != NULL) {
if (STREQ(entry.mnt_type, "cgroup") && !strstr(entry.mnt_opts, "name=")) {
ret = true;
break;
}
}
VIR_FORCE_FCLOSE(mounts);
return ret;
}
static bool
virCgroupV1ValidateMachineGroup(virCgroup *group,
const char *name,
const char *drivername,
const char *machinename)
{
size_t i;
g_autofree char *partname = NULL;
g_autofree char *scopename_old = NULL;
g_autofree char *scopename_new = NULL;
g_autofree char *partmachinename = NULL;
partname = g_strdup_printf("%s.libvirt-%s", name, drivername);
if (virCgroupPartitionEscape(&partname) < 0)
return false;
partmachinename = g_strdup_printf("%s.libvirt-%s",
machinename, drivername);
if (virCgroupPartitionEscape(&partmachinename) < 0)
return false;
if (!(scopename_old = virSystemdMakeScopeName(name, drivername, true)))
return false;
if (!(scopename_new = virSystemdMakeScopeName(machinename,
drivername, false)))
return false;
if (virCgroupPartitionEscape(&scopename_old) < 0)
return false;
if (virCgroupPartitionEscape(&scopename_new) < 0)
return false;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
char *tmp;
if (i == VIR_CGROUP_CONTROLLER_SYSTEMD)
continue;
if (!group->legacy[i].placement)
continue;
tmp = strrchr(group->legacy[i].placement, '/');
if (!tmp)
return false;
if (i == VIR_CGROUP_CONTROLLER_CPU ||
i == VIR_CGROUP_CONTROLLER_CPUACCT ||
i == VIR_CGROUP_CONTROLLER_CPUSET) {
if (STREQ(tmp, "/emulator"))
*tmp = '\0';
tmp = strrchr(group->legacy[i].placement, '/');
if (!tmp)
return false;
}
tmp++;
if (STRNEQ(tmp, name) &&
STRNEQ(tmp, machinename) &&
STRNEQ(tmp, partname) &&
STRNEQ(tmp, partmachinename) &&
STRNEQ(tmp, scopename_old) &&
STRNEQ(tmp, scopename_new)) {
VIR_DEBUG("Name '%s' for controller '%s' does not match "
"'%s', '%s', '%s', '%s' or '%s'",
tmp, virCgroupV1ControllerTypeToString(i),
name, machinename, partname,
scopename_old, scopename_new);
return false;
}
}
return true;
}
static int
virCgroupV1CopyMounts(virCgroup *group,
virCgroup *parent)
{
size_t i;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
if (!parent->legacy[i].mountPoint)
continue;
group->legacy[i].mountPoint = g_strdup(parent->legacy[i].mountPoint);
group->legacy[i].linkPoint = g_strdup(parent->legacy[i].linkPoint);
}
return 0;
}
static int
virCgroupV1CopyPlacement(virCgroup *group,
const char *path,
virCgroup *parent)
{
size_t i;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
bool delim;
if (!group->legacy[i].mountPoint)
continue;
if (i == VIR_CGROUP_CONTROLLER_SYSTEMD)
continue;
delim = STREQ(parent->legacy[i].placement, "/") || STREQ(path, "");
/*
* parent == "/" + path="" => "/"
* parent == "/libvirt.service" + path == "" => "/libvirt.service"
* parent == "/libvirt.service" + path == "foo" => "/libvirt.service/foo"
*/
group->legacy[i].placement = g_strdup_printf("%s%s%s",
parent->legacy[i].placement,
delim ? "" : "/",
path);
}
return 0;
}
static int
virCgroupV1ResolveMountLink(const char *mntDir,
const char *typeStr,
virCgroupV1Controller *controller)
{
g_autofree char *linkSrc = NULL;
g_autofree char *tmp = NULL;
char *dirName;
GStatBuf sb;
tmp = g_strdup(mntDir);
dirName = strrchr(tmp, '/');
if (!dirName) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Missing '/' separator in cgroup mount '%s'"), tmp);
return -1;
}
if (!strchr(dirName + 1, ','))
return 0;
*dirName = '\0';
linkSrc = g_strdup_printf("%s/%s", tmp, typeStr);
*dirName = '/';
if (g_lstat(linkSrc, &sb) < 0) {
if (errno == ENOENT) {
VIR_WARN("Controller %s co-mounted at %s is missing symlink at %s",
typeStr, tmp, linkSrc);
} else {
virReportSystemError(errno, _("Cannot stat %s"), linkSrc);
return -1;
}
} else {
if (!S_ISLNK(sb.st_mode)) {
VIR_WARN("Expecting a symlink at %s for controller %s",
linkSrc, typeStr);
} else {
controller->linkPoint = g_steal_pointer(&linkSrc);
}
}
return 0;
}
static bool
virCgroupV1MountOptsMatchController(const char *mntOpts,
const char *typeStr)
{
const char *tmp = mntOpts;
int typeLen = strlen(typeStr);
while (tmp) {
const char *next = strchr(tmp, ',');
int len;
if (next) {
len = next - tmp;
next++;
} else {
len = strlen(tmp);
}
if (typeLen == len && STREQLEN(typeStr, tmp, len))
return true;
tmp = next;
}
return false;
}
static int
virCgroupV1DetectMounts(virCgroup *group,
const char *mntType,
const char *mntOpts,
const char *mntDir)
{
size_t i;
if (STRNEQ(mntType, "cgroup"))
return 0;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
const char *typestr = virCgroupV1ControllerTypeToString(i);
if (virCgroupV1MountOptsMatchController(mntOpts, typestr)) {
/* Note that the lines in /proc/mounts have the same
* order than the mount operations, and that there may
* be duplicates due to bind mounts. This means
* that the same mount point may be processed more than
* once. We need to save the results of the last one,
* and we need to be careful to release the memory used
* by previous processing. */
virCgroupV1Controller *controller = &group->legacy[i];
VIR_FREE(controller->mountPoint);
VIR_FREE(controller->linkPoint);
controller->mountPoint = g_strdup(mntDir);
/* If it is a co-mount it has a filename like "cpu,cpuacct"
* and we must identify the symlink path */
if (virCgroupV1ResolveMountLink(mntDir, typestr, controller) < 0)
return -1;
}
}
return 0;
}
static int
virCgroupV1DetectPlacement(virCgroup *group,
const char *path,
const char *controllers,
const char *selfpath)
{
size_t i;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
const char *typestr = virCgroupV1ControllerTypeToString(i);
g_autofree char* placement = NULL;
char *tmp = NULL;
if (!virCgroupV1MountOptsMatchController(controllers, typestr))
continue;
if (!group->legacy[i].mountPoint)
continue;
if (group->legacy[i].placement)
continue;
/* On systemd we create a nested cgroup for some cgroup tasks
* but the placement should point to the root cgroup. */
placement = g_strdup(selfpath);
tmp = g_strrstr(placement, "/libvirt");
if (tmp)
*tmp = '\0';
/*
* selfpath == "/" + path="" -> "/"
* selfpath == "/libvirt.service" + path == "" -> "/libvirt.service"
* selfpath == "/libvirt.service" + path == "foo" -> "/libvirt.service/foo"
*/
if (i == VIR_CGROUP_CONTROLLER_SYSTEMD) {
group->legacy[i].placement = g_strdup(placement);
} else {
bool delim = STREQ(placement, "/") || STREQ(path, "");
group->legacy[i].placement = g_strdup_printf("%s%s%s", placement,
delim ? "" : "/",
path);
}
}
return 0;
}
static int
virCgroupV1SetPlacement(virCgroup *group,
const char *path)
{
size_t i;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
if (!group->legacy[i].mountPoint)
continue;
if (i == VIR_CGROUP_CONTROLLER_SYSTEMD)
continue;
group->legacy[i].placement = g_strdup(path);
}
return 0;
}
static int
virCgroupV1ValidatePlacement(virCgroup *group,
pid_t pid)
{
size_t i;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
if (!group->legacy[i].mountPoint)
continue;
if (!group->legacy[i].placement) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Could not find placement for v1 controller %s"),
virCgroupV1ControllerTypeToString(i));
return -1;
}
VIR_DEBUG("Detected mount/mapping %zu:%s at %s in %s for pid %lld",
i,
virCgroupV1ControllerTypeToString(i),
group->legacy[i].mountPoint,
group->legacy[i].placement,
(long long) pid);
}
return 0;
}
static char *
virCgroupV1StealPlacement(virCgroup *group)
{
return g_steal_pointer(&group->legacy[VIR_CGROUP_CONTROLLER_SYSTEMD].placement);
}
static int
virCgroupV1DetectControllers(virCgroup *group,
int controllers,
virCgroup *parent G_GNUC_UNUSED,
int detected)
{
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)) {
int type = 1 << i;
if (type & detected) {
VIR_FREE(group->legacy[i].mountPoint);
VIR_FREE(group->legacy[i].placement);
}
/* Remove non-existent controllers */
if (!group->legacy[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->legacy[i].mountPoint));
if (!((1 << i) & controllers) &&
group->legacy[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->legacy[i].mountPoint,
group->legacy[j].mountPoint)) {
virReportSystemError(EINVAL,
_("V1 controller '%s' is not wanted, but '%s' is co-mounted"),
virCgroupV1ControllerTypeToString(i),
virCgroupV1ControllerTypeToString(j));
return -1;
}
}
VIR_FREE(group->legacy[i].mountPoint);
VIR_FREE(group->legacy[i].placement);
}
}
} else {
VIR_DEBUG("Auto-detecting controllers");
controllers = 0;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
int type = 1 << i;
if (type & detected) {
VIR_FREE(group->legacy[i].mountPoint);
VIR_FREE(group->legacy[i].placement);
}
VIR_DEBUG("Controller '%s' present=%s",
virCgroupV1ControllerTypeToString(i),
group->legacy[i].mountPoint ? "yes" : "no");
if (group->legacy[i].mountPoint == NULL)
continue;
controllers |= (1 << i);
}
}
return controllers;
}
static bool
virCgroupV1HasController(virCgroup *group,
int controller)
{
return group->legacy[controller].mountPoint != NULL;
}
static int
virCgroupV1GetAnyController(virCgroup *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->legacy[i].mountPoint &&
group->legacy[i].placement &&
STRNEQ(group->legacy[i].placement, "/")) {
return i;
}
}
return -1;
}
static int
virCgroupV1PathOfController(virCgroup *group,
int controller,
const char *key,
char **path)
{
if (group->legacy[controller].mountPoint == NULL) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("v1 controller '%s' is not mounted"),
virCgroupV1ControllerTypeToString(controller));
return -1;
}
if (group->legacy[controller].placement == NULL) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("v1 controller '%s' is not enabled for group"),
virCgroupV1ControllerTypeToString(controller));
return -1;
}
*path = g_strdup_printf("%s%s/%s", group->legacy[controller].mountPoint,
group->legacy[controller].placement, NULLSTR_EMPTY(key));
return 0;
}
static int
virCgroupV1CpuSetInherit(virCgroup *parent,
virCgroup *group)
{
size_t i;
const char *inherit_values[] = {
"cpuset.cpus",
"cpuset.mems",
"cpuset.memory_migrate",
};
VIR_DEBUG("Setting up inheritance %s -> %s",
parent->legacy[VIR_CGROUP_CONTROLLER_CPUSET].placement,
group->legacy[VIR_CGROUP_CONTROLLER_CPUSET].placement);
for (i = 0; i < G_N_ELEMENTS(inherit_values); i++) {
g_autofree char *value = NULL;
if (virCgroupGetValueStr(parent,
VIR_CGROUP_CONTROLLER_CPUSET,
inherit_values[i],
&value) < 0)
return -1;
VIR_DEBUG("Inherit %s = %s", inherit_values[i], value);
if (virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_CPUSET,
inherit_values[i],
value) < 0)
return -1;
}
return 0;
}
static int
virCgroupV1SetMemoryUseHierarchy(virCgroup *group)
{
unsigned long long value;
const char *filename = "memory.use_hierarchy";
if (virCgroupGetValueU64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
filename, &value) < 0)
return -1;
/* Setting twice causes error, so if already enabled, skip setting */
if (value == 1)
return 0;
if (virCgroupSetValueU64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
filename, 1) < 0)
return -1;
return 0;
}
static int
virCgroupV1MakeGroup(virCgroup *parent,
virCgroup *group,
bool create,
pid_t pid G_GNUC_UNUSED,
unsigned int flags)
{
size_t i;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
g_autofree char *path = NULL;
/* We must never mkdir() in systemd's hierarchy */
if (i == VIR_CGROUP_CONTROLLER_SYSTEMD) {
VIR_DEBUG("Not creating systemd controller group");
continue;
}
/* Skip over controllers that aren't mounted */
if (!group->legacy[i].mountPoint) {
VIR_DEBUG("Skipping unmounted controller %s",
virCgroupV1ControllerTypeToString(i));
continue;
}
if (virCgroupV1PathOfController(group, i, "", &path) < 0)
return -1;
VIR_DEBUG("Make controller %s", path);
if (!virFileExists(path)) {
if (!create ||
mkdir(path, 0755) < 0) {
if (errno == EEXIST)
continue;
/* With a kernel that doesn't support multi-level directory
* for blkio controller, libvirt will fail and disable all
* other controllers even though they are available. So
* treat blkio as unmounted if mkdir fails. */
if (i == VIR_CGROUP_CONTROLLER_BLKIO) {
VIR_DEBUG("Ignoring mkdir failure with blkio controller. Kernel probably too old");
VIR_FREE(group->legacy[i].mountPoint);
continue;
} else {
virReportSystemError(errno,
_("Failed to create v1 controller %s for group"),
virCgroupV1ControllerTypeToString(i));
return -1;
}
}
if (i == VIR_CGROUP_CONTROLLER_CPUSET &&
group->legacy[i].mountPoint != NULL &&
virCgroupV1CpuSetInherit(parent, group) < 0) {
return -1;
}
/*
* Note that virCgroupV1SetMemoryUseHierarchy should always be
* called prior to creating subcgroups and attaching tasks.
*/
if ((flags & VIR_CGROUP_MEM_HIERACHY) &&
i == VIR_CGROUP_CONTROLLER_MEMORY &&
group->legacy[i].mountPoint != NULL &&
virCgroupV1SetMemoryUseHierarchy(group) < 0) {
return -1;
}
}
}
VIR_DEBUG("Done making controllers for group");
return 0;
}
static bool
virCgroupV1Exists(virCgroup *group)
{
size_t i;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
g_autofree char *path = NULL;
if (i == VIR_CGROUP_CONTROLLER_SYSTEMD)
continue;
if (!group->legacy[i].mountPoint)
continue;
if (virCgroupV1PathOfController(group, i, "", &path) < 0)
return false;
if (!virFileExists(path)) {
return false;
}
}
return true;
}
static int
virCgroupV1Remove(virCgroup *group)
{
int rc = 0;
size_t i;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
g_autofree char *grppath = NULL;
/* Skip over controllers not mounted */
if (!group->legacy[i].mountPoint)
continue;
/* We must never rmdir() in systemd's hierarchy */
if (i == VIR_CGROUP_CONTROLLER_SYSTEMD)
continue;
/* Don't delete the root group, if we accidentally
ended up in it for some reason */
if (STREQ(group->legacy[i].placement, "/"))
continue;
if (virCgroupV1PathOfController(group,
i,
NULL,
&grppath) != 0)
continue;
VIR_DEBUG("Removing cgroup %s and all child cgroups", grppath);
rc = virCgroupRemoveRecursively(grppath);
}
return rc;
}
static int
virCgroupV1AddTask(virCgroup *group,
pid_t pid,
unsigned int flags)
{
size_t i;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
/* Skip over controllers not mounted */
if (!group->legacy[i].mountPoint)
continue;
/* We must never add tasks in systemd's hierarchy
* unless we're intentionally trying to move a
* task into a systemd machine scope */
if (i == VIR_CGROUP_CONTROLLER_SYSTEMD &&
!(flags & VIR_CGROUP_TASK_SYSTEMD))
continue;
if (virCgroupSetValueI64(group, i, "tasks", pid) < 0)
return -1;
}
return 0;
}
static int
virCgroupV1HasEmptyTasks(virCgroup *cgroup,
int controller)
{
int ret = -1;
g_autofree char *content = NULL;
if (!cgroup)
return -1;
ret = virCgroupGetValueStr(cgroup, controller, "tasks", &content);
if (ret == 0 && content[0] == '\0')
ret = 1;
return ret;
}
static int
virCgroupV1KillRecursive(virCgroup *group,
int signum,
GHashTable *pids)
{
return virCgroupKillRecursiveInternal(group, signum, pids,
"tasks", false);
}
static char *
virCgroupV1IdentifyRoot(virCgroup *group)
{
char *ret = NULL;
size_t i;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
char *tmp;
if (!group->legacy[i].mountPoint)
continue;
if (!(tmp = strrchr(group->legacy[i].mountPoint, '/'))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Could not find directory separator in %s"),
group->legacy[i].mountPoint);
return NULL;
}
ret = g_strndup(group->legacy[i].mountPoint,
tmp - group->legacy[i].mountPoint);
return ret;
}
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Could not find any mounted v1 controllers"));
return NULL;
}
static int
virCgroupV1BindMount(virCgroup *group,
const char *oldroot,
const char *mountopts)
{
size_t i;
g_autofree char *opts = NULL;
g_autofree char *root = NULL;
if (!(root = virCgroupV1IdentifyRoot(group)))
return -1;
VIR_DEBUG("Mounting cgroups at '%s'", root);
if (g_mkdir_with_parents(root, 0777) < 0) {
virReportSystemError(errno,
_("Unable to create directory %s"),
root);
return -1;
}
opts = g_strdup_printf("mode=755,size=65536%s", mountopts);
if (mount("tmpfs", root, "tmpfs", MS_NOSUID|MS_NODEV|MS_NOEXEC, opts) < 0) {
virReportSystemError(errno,
_("Failed to mount %s on %s type %s"),
"tmpfs", root, "tmpfs");
return -1;
}
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
if (!group->legacy[i].mountPoint)
continue;
if (!virFileExists(group->legacy[i].mountPoint)) {
g_autofree char *src = NULL;
src = g_strdup_printf("%s%s", oldroot, group->legacy[i].mountPoint);
VIR_DEBUG("Create mount point '%s'",
group->legacy[i].mountPoint);
if (g_mkdir_with_parents(group->legacy[i].mountPoint, 0777) < 0) {
virReportSystemError(errno,
_("Unable to create directory %s"),
group->legacy[i].mountPoint);
return -1;
}
if (mount(src, group->legacy[i].mountPoint, "none", MS_BIND,
NULL) < 0) {
virReportSystemError(errno,
_("Failed to bind cgroup '%s' on '%s'"),
src, group->legacy[i].mountPoint);
return -1;
}
}
if (group->legacy[i].linkPoint) {
VIR_DEBUG("Link mount point '%s' to '%s'",
group->legacy[i].mountPoint,
group->legacy[i].linkPoint);
if (symlink(group->legacy[i].mountPoint,
group->legacy[i].linkPoint) < 0) {
virReportSystemError(errno,
_("Unable to symlink directory %s to %s"),
group->legacy[i].mountPoint,
group->legacy[i].linkPoint);
return -1;
}
}
}
return 0;
}
static int
virCgroupV1SetOwner(virCgroup *cgroup,
uid_t uid,
gid_t gid,
int controllers)
{
size_t i;
int direrr;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
g_autofree char *base = NULL;
struct dirent *de;
g_autoptr(DIR) dh = NULL;
if (!((1 << i) & controllers))
continue;
if (!cgroup->legacy[i].mountPoint)
continue;
base = g_strdup_printf("%s%s", cgroup->legacy[i].mountPoint,
cgroup->legacy[i].placement);
if (virDirOpen(&dh, base) < 0)
return -1;
while ((direrr = virDirRead(dh, &de, base)) > 0) {
g_autofree char *entry = NULL;
entry = g_strdup_printf("%s/%s", base, de->d_name);
if (chown(entry, uid, gid) < 0) {
virReportSystemError(errno,
_("cannot chown '%s' to (%u, %u)"),
entry, uid, gid);
return -1;
}
}
if (direrr < 0)
return -1;
if (chown(base, uid, gid) < 0) {
virReportSystemError(errno,
_("cannot chown '%s' to (%u, %u)"),
base, uid, gid);
return -1;
}
}
return 0;
}
static int
virCgroupV1SetBlkioWeight(virCgroup *group,
unsigned int weight)
{
g_autofree char *path = NULL;
if (virCgroupV1PathOfController(group, VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.bfq.weight", &path) < 0) {
return -1;
}
if (!virFileExists(path)) {
VIR_FREE(path);
if (virCgroupV1PathOfController(group, VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.weight", &path) < 0) {
return -1;
}
}
if (!virFileExists(path)) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("blkio device weight is valid only for bfq or cfq scheduler"));
return -1;
}
if (group->unitName) {
GVariant *value = g_variant_new("t", weight);
return virCgroupSetValueDBus(group->unitName, "BlockIOWeight", value);
} else {
g_autofree char *value = g_strdup_printf("%u", weight);
return virCgroupSetValueRaw(path, value);
}
}
static int
virCgroupV1GetBlkioWeight(virCgroup *group,
unsigned int *weight)
{
g_autofree char *path = NULL;
g_autofree char *value = NULL;
if (virCgroupV1PathOfController(group, VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.bfq.weight", &path) < 0) {
return -1;
}
if (!virFileExists(path)) {
VIR_FREE(path);
if (virCgroupV1PathOfController(group, VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.weight", &path) < 0) {
return -1;
}
}
if (!virFileExists(path)) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("blkio device weight is valid only for bfq or cfq scheduler"));
return -1;
}
if (virCgroupGetValueRaw(path, &value) < 0)
return -1;
if (virStrToLong_ui(value, NULL, 10, weight) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to parse '%s' as an integer"),
value);
return -1;
}
return 0;
}
static int
virCgroupV1GetBlkioIoServiced(virCgroup *group,
long long *bytes_read,
long long *bytes_write,
long long *requests_read,
long long *requests_write)
{
long long stats_val;
g_autofree char *str1 = NULL;
g_autofree char *str2 = NULL;
char *p1 = NULL;
char *p2 = NULL;
size_t i;
const char *value_names[] = {
"Read ",
"Write "
};
long long *bytes_ptrs[] = {
bytes_read,
bytes_write
};
long long *requests_ptrs[] = {
requests_read,
requests_write
};
*bytes_read = 0;
*bytes_write = 0;
*requests_read = 0;
*requests_write = 0;
if (virCgroupGetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.io_service_bytes", &str1) < 0)
return -1;
if (virCgroupGetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.io_serviced", &str2) < 0)
return -1;
/* sum up all entries of the same kind, from all devices */
for (i = 0; i < G_N_ELEMENTS(value_names); i++) {
p1 = str1;
p2 = str2;
while ((p1 = strstr(p1, value_names[i]))) {
p1 += strlen(value_names[i]);
if (virStrToLong_ll(p1, &p1, 10, &stats_val) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Cannot parse byte %sstat '%s'"),
value_names[i],
p1);
return -1;
}
if (stats_val < 0 ||
(stats_val > 0 && *bytes_ptrs[i] > (LLONG_MAX - stats_val)))
{
virReportError(VIR_ERR_OVERFLOW,
_("Sum of byte %sstat overflows"),
value_names[i]);
return -1;
}
*bytes_ptrs[i] += stats_val;
}
while ((p2 = strstr(p2, value_names[i]))) {
p2 += strlen(value_names[i]);
if (virStrToLong_ll(p2, &p2, 10, &stats_val) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Cannot parse %srequest stat '%s'"),
value_names[i],
p2);
return -1;
}
if (stats_val < 0 ||
(stats_val > 0 && *requests_ptrs[i] > (LLONG_MAX - stats_val)))
{
virReportError(VIR_ERR_OVERFLOW,
_("Sum of %srequest stat overflows"),
value_names[i]);
return -1;
}
*requests_ptrs[i] += stats_val;
}
}
return 0;
}
static int
virCgroupV1GetBlkioIoDeviceServiced(virCgroup *group,
const char *path,
long long *bytes_read,
long long *bytes_write,
long long *requests_read,
long long *requests_write)
{
g_autofree char *str1 = NULL;
g_autofree char *str2 = NULL;
g_autofree char *str3 = NULL;
char *p1 = NULL;
char *p2 = NULL;
size_t i;
const char *value_names[] = {
"Read ",
"Write "
};
long long *bytes_ptrs[] = {
bytes_read,
bytes_write
};
long long *requests_ptrs[] = {
requests_read,
requests_write
};
if (virCgroupGetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.io_service_bytes", &str1) < 0)
return -1;
if (virCgroupGetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.io_serviced", &str2) < 0)
return -1;
if (!(str3 = virCgroupGetBlockDevString(path)))
return -1;
if (!(p1 = strstr(str1, str3))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Cannot find byte stats for block device '%s'"),
str3);
return -1;
}
if (!(p2 = strstr(str2, str3))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Cannot find request stats for block device '%s'"),
str3);
return -1;
}
for (i = 0; i < G_N_ELEMENTS(value_names); i++) {
if (!(p1 = strstr(p1, value_names[i]))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Cannot find byte %sstats for block device '%s'"),
value_names[i], str3);
return -1;
}
if (virStrToLong_ll(p1 + strlen(value_names[i]), &p1, 10, bytes_ptrs[i]) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Cannot parse %sstat '%s'"),
value_names[i], p1 + strlen(value_names[i]));
return -1;
}
if (!(p2 = strstr(p2, value_names[i]))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Cannot find request %sstats for block device '%s'"),
value_names[i], str3);
return -1;
}
if (virStrToLong_ll(p2 + strlen(value_names[i]), &p2, 10, requests_ptrs[i]) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Cannot parse %sstat '%s'"),
value_names[i], p2 + strlen(value_names[i]));
return -1;
}
}
return 0;
}
static int
virCgroupV1SetBlkioDeviceWeight(virCgroup *group,
const char *devPath,
unsigned int weight)
{
g_autofree char *path = NULL;
if (virCgroupV1PathOfController(group, VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.weight_device", &path) < 0) {
return -1;
}
if (!virFileExists(path)) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("blkio device weight is valid only for cfq scheduler"));
return -1;
}
if (group->unitName) {
GVariant *value = NULL;
value = g_variant_new_parsed("[(%s, uint64 %u)]", path, weight);
return virCgroupSetValueDBus(group->unitName, "BlockIODeviceWeight", value);
} else {
g_autofree char *str = NULL;
g_autofree char *blkstr = NULL;
if (!(blkstr = virCgroupGetBlockDevString(devPath)))
return -1;
str = g_strdup_printf("%s%d", blkstr, weight);
return virCgroupSetValueRaw(path, str);
}
}
static int
virCgroupV1GetBlkioDeviceWeight(virCgroup *group,
const char *devPath,
unsigned int *weight)
{
g_autofree char *str = NULL;
g_autofree char *value = NULL;
g_autofree char *path = NULL;
if (virCgroupV1PathOfController(group, VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.weight_device", &path) < 0) {
return -1;
}
if (!virFileExists(path)) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("blkio device weight is valid only for cfq scheduler"));
return -1;
}
if (virCgroupGetValueRaw(path, &value) < 0)
return -1;
if (virCgroupGetValueForBlkDev(value, devPath, &str) < 0)
return -1;
if (!str) {
*weight = 0;
} else if (virStrToLong_ui(str, NULL, 10, weight) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to parse '%s' as an integer"),
str);
return -1;
}
return 0;
}
static int
virCgroupV1SetBlkioDeviceReadIops(virCgroup *group,
const char *path,
unsigned int riops)
{
g_autofree char *str = NULL;
g_autofree char *blkstr = NULL;
if (!(blkstr = virCgroupGetBlockDevString(path)))
return -1;
str = g_strdup_printf("%s%u", blkstr, riops);
return virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.read_iops_device",
str);
}
static int
virCgroupV1GetBlkioDeviceReadIops(virCgroup *group,
const char *path,
unsigned int *riops)
{
g_autofree char *str = NULL;
g_autofree char *value = NULL;
if (virCgroupGetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.read_iops_device",
&value) < 0) {
return -1;
}
if (virCgroupGetValueForBlkDev(value, path, &str) < 0)
return -1;
if (!str) {
*riops = 0;
} else if (virStrToLong_ui(str, NULL, 10, riops) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to parse '%s' as an integer"),
str);
return -1;
}
return 0;
}
static int
virCgroupV1SetBlkioDeviceWriteIops(virCgroup *group,
const char *path,
unsigned int wiops)
{
g_autofree char *str = NULL;
g_autofree char *blkstr = NULL;
if (!(blkstr = virCgroupGetBlockDevString(path)))
return -1;
str = g_strdup_printf("%s%u", blkstr, wiops);
return virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.write_iops_device",
str);
}
static int
virCgroupV1GetBlkioDeviceWriteIops(virCgroup *group,
const char *path,
unsigned int *wiops)
{
g_autofree char *str = NULL;
g_autofree char *value = NULL;
if (virCgroupGetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.write_iops_device",
&value) < 0) {
return -1;
}
if (virCgroupGetValueForBlkDev(value, path, &str) < 0)
return -1;
if (!str) {
*wiops = 0;
} else if (virStrToLong_ui(str, NULL, 10, wiops) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to parse '%s' as an integer"),
str);
return -1;
}
return 0;
}
static int
virCgroupV1SetBlkioDeviceReadBps(virCgroup *group,
const char *path,
unsigned long long rbps)
{
g_autofree char *str = NULL;
g_autofree char *blkstr = NULL;
if (!(blkstr = virCgroupGetBlockDevString(path)))
return -1;
str = g_strdup_printf("%s%llu", blkstr, rbps);
return virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.read_bps_device",
str);
}
static int
virCgroupV1GetBlkioDeviceReadBps(virCgroup *group,
const char *path,
unsigned long long *rbps)
{
g_autofree char *str = NULL;
g_autofree char *value = NULL;
if (virCgroupGetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.read_bps_device",
&value) < 0) {
return -1;
}
if (virCgroupGetValueForBlkDev(value, path, &str) < 0)
return -1;
if (!str) {
*rbps = 0;
} else if (virStrToLong_ull(str, NULL, 10, rbps) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to parse '%s' as an integer"),
str);
return -1;
}
return 0;
}
static int
virCgroupV1SetBlkioDeviceWriteBps(virCgroup *group,
const char *path,
unsigned long long wbps)
{
g_autofree char *str = NULL;
g_autofree char *blkstr = NULL;
if (!(blkstr = virCgroupGetBlockDevString(path)))
return -1;
str = g_strdup_printf("%s%llu", blkstr, wbps);
return virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.write_bps_device",
str);
}
static int
virCgroupV1GetBlkioDeviceWriteBps(virCgroup *group,
const char *path,
unsigned long long *wbps)
{
g_autofree char *str = NULL;
g_autofree char *value = NULL;
if (virCgroupGetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.write_bps_device",
&value) < 0) {
return -1;
}
if (virCgroupGetValueForBlkDev(value, path, &str) < 0)
return -1;
if (!str) {
*wbps = 0;
} else if (virStrToLong_ull(str, NULL, 10, wbps) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to parse '%s' as an integer"),
str);
return -1;
}
return 0;
}
/*
* Retrieve the "memory.limit_in_bytes" value from the memory controller
* root dir. This value cannot be modified by userspace and therefore
* is the maximum limit value supported by cgroups on the local system.
* Returns this value scaled to KB or falls back to the original
* VIR_DOMAIN_MEMORY_PARAM_UNLIMITED. Either way, remember the return
* value to avoid unnecessary cgroup filesystem access.
*/
static unsigned long long int virCgroupV1MemoryUnlimitedKB;
static virOnceControl virCgroupV1MemoryOnce = VIR_ONCE_CONTROL_INITIALIZER;
static void
virCgroupV1MemoryOnceInit(void)
{
g_autoptr(virCgroup) group = NULL;
unsigned long long int mem_unlimited = 0ULL;
if (virCgroupNew("/", -1, &group) < 0)
return;
if (!virCgroupV1HasController(group, VIR_CGROUP_CONTROLLER_MEMORY))
return;
ignore_value(virCgroupGetValueU64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
"memory.limit_in_bytes",
&mem_unlimited));
virCgroupV1MemoryUnlimitedKB = mem_unlimited >> 10;
}
static unsigned long long int
virCgroupV1GetMemoryUnlimitedKB(void)
{
if (virOnce(&virCgroupV1MemoryOnce, virCgroupV1MemoryOnceInit) < 0)
VIR_DEBUG("Init failed, will fall back to defaults.");
if (virCgroupV1MemoryUnlimitedKB)
return virCgroupV1MemoryUnlimitedKB;
else
return VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
}
static int
virCgroupV1SetMemory(virCgroup *group,
unsigned long long kb)
{
unsigned long long maxkb = VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
if (kb > maxkb) {
virReportError(VIR_ERR_INVALID_ARG,
_("Memory '%llu' must be less than %llu"),
kb, maxkb);
return -1;
}
if (kb == maxkb)
return virCgroupSetValueI64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
"memory.limit_in_bytes",
-1);
else
return virCgroupSetValueU64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
"memory.limit_in_bytes",
kb << 10);
}
static int
virCgroupV1GetMemoryStat(virCgroup *group,
unsigned long long *cache,
unsigned long long *activeAnon,
unsigned long long *inactiveAnon,
unsigned long long *activeFile,
unsigned long long *inactiveFile,
unsigned long long *unevictable)
{
g_autofree char *stat = NULL;
char *line = NULL;
unsigned long long cacheVal = 0;
unsigned long long activeAnonVal = 0;
unsigned long long inactiveAnonVal = 0;
unsigned long long activeFileVal = 0;
unsigned long long inactiveFileVal = 0;
unsigned long long unevictableVal = 0;
if (virCgroupGetValueStr(group,
VIR_CGROUP_CONTROLLER_MEMORY,
"memory.stat",
&stat) < 0) {
return -1;
}
line = stat;
while (*line) {
char *newLine = strchr(line, '\n');
char *valueStr = strchr(line, ' ');
unsigned long long value;
if (newLine)
*newLine = '\0';
if (!valueStr) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Cannot parse 'memory.stat' cgroup file."));
return -1;
}
*valueStr = '\0';
if (virStrToLong_ull(valueStr + 1, NULL, 10, &value) < 0)
return -1;
if (STREQ(line, "cache"))
cacheVal = value >> 10;
else if (STREQ(line, "active_anon"))
activeAnonVal = value >> 10;
else if (STREQ(line, "inactive_anon"))
inactiveAnonVal = value >> 10;
else if (STREQ(line, "active_file"))
activeFileVal = value >> 10;
else if (STREQ(line, "inactive_file"))
inactiveFileVal = value >> 10;
else if (STREQ(line, "unevictable"))
unevictableVal = value >> 10;
if (newLine)
line = newLine + 1;
else
break;
}
*cache = cacheVal;
*activeAnon = activeAnonVal;
*inactiveAnon = inactiveAnonVal;
*activeFile = activeFileVal;
*inactiveFile = inactiveFileVal;
*unevictable = unevictableVal;
return 0;
}
static int
virCgroupV1GetMemoryUsage(virCgroup *group,
unsigned long *kb)
{
long long unsigned int usage_in_bytes;
int ret;
ret = virCgroupGetValueU64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
"memory.usage_in_bytes", &usage_in_bytes);
if (ret == 0)
*kb = (unsigned long) usage_in_bytes >> 10;
return ret;
}
static int
virCgroupV1SetMemoryHardLimit(virCgroup *group,
unsigned long long kb)
{
return virCgroupV1SetMemory(group, kb);
}
static int
virCgroupV1GetMemoryHardLimit(virCgroup *group,
unsigned long long *kb)
{
long long unsigned int limit_in_bytes;
if (virCgroupGetValueU64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
"memory.limit_in_bytes", &limit_in_bytes) < 0)
return -1;
*kb = limit_in_bytes >> 10;
if (*kb >= virCgroupV1GetMemoryUnlimitedKB())
*kb = VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
return 0;
}
static int
virCgroupV1SetMemorySoftLimit(virCgroup *group,
unsigned long long kb)
{
unsigned long long maxkb = VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
if (kb > maxkb) {
virReportError(VIR_ERR_INVALID_ARG,
_("Memory '%llu' must be less than %llu"),
kb, maxkb);
return -1;
}
if (kb == maxkb)
return virCgroupSetValueI64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
"memory.soft_limit_in_bytes",
-1);
else
return virCgroupSetValueU64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
"memory.soft_limit_in_bytes",
kb << 10);
}
static int
virCgroupV1GetMemorySoftLimit(virCgroup *group,
unsigned long long *kb)
{
long long unsigned int limit_in_bytes;
if (virCgroupGetValueU64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
"memory.soft_limit_in_bytes", &limit_in_bytes) < 0)
return -1;
*kb = limit_in_bytes >> 10;
if (*kb >= virCgroupV1GetMemoryUnlimitedKB())
*kb = VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
return 0;
}
static int
virCgroupV1SetMemSwapHardLimit(virCgroup *group,
unsigned long long kb)
{
unsigned long long maxkb = VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
if (kb > maxkb) {
virReportError(VIR_ERR_INVALID_ARG,
_("Memory '%llu' must be less than %llu"),
kb, maxkb);
return -1;
}
if (kb == maxkb)
return virCgroupSetValueI64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
"memory.memsw.limit_in_bytes",
-1);
else
return virCgroupSetValueU64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
"memory.memsw.limit_in_bytes",
kb << 10);
}
static int
virCgroupV1GetMemSwapHardLimit(virCgroup *group,
unsigned long long *kb)
{
long long unsigned int limit_in_bytes;
if (virCgroupGetValueU64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
"memory.memsw.limit_in_bytes", &limit_in_bytes) < 0)
return -1;
*kb = limit_in_bytes >> 10;
if (*kb >= virCgroupV1GetMemoryUnlimitedKB())
*kb = VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
return 0;
}
static int
virCgroupV1GetMemSwapUsage(virCgroup *group,
unsigned long long *kb)
{
long long unsigned int usage_in_bytes;
int ret;
ret = virCgroupGetValueU64(group,
VIR_CGROUP_CONTROLLER_MEMORY,
"memory.memsw.usage_in_bytes", &usage_in_bytes);
if (ret == 0)
*kb = usage_in_bytes >> 10;
return ret;
}
static int
virCgroupV1AllowDevice(virCgroup *group,
char type,
int major,
int minor,
int perms)
{
g_autofree char *devstr = NULL;
g_autofree char *majorstr = NULL;
g_autofree char *minorstr = NULL;
if (major < 0)
majorstr = g_strdup("*");
else
majorstr = g_strdup_printf("%i", major);
if (minor < 0)
minorstr = g_strdup("*");
else
minorstr = g_strdup_printf("%i", minor);
devstr = g_strdup_printf("%c %s:%s %s", type, majorstr, minorstr,
virCgroupGetDevicePermsString(perms));
if (virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_DEVICES,
"devices.allow",
devstr) < 0)
return -1;
return 0;
}
static int
virCgroupV1DenyDevice(virCgroup *group,
char type,
int major,
int minor,
int perms)
{
g_autofree char *devstr = NULL;
g_autofree char *majorstr = NULL;
g_autofree char *minorstr = NULL;
if (major < 0)
majorstr = g_strdup("*");
else
majorstr = g_strdup_printf("%i", major);
if (minor < 0)
minorstr = g_strdup("*");
else
minorstr = g_strdup_printf("%i", minor);
devstr = g_strdup_printf("%c %s:%s %s", type, majorstr, minorstr,
virCgroupGetDevicePermsString(perms));
if (virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_DEVICES,
"devices.deny",
devstr) < 0)
return -1;
return 0;
}
static int
virCgroupV1AllowAllDevices(virCgroup *group,
int perms)
{
if (virCgroupV1AllowDevice(group, 'b', -1, -1, perms) < 0)
return -1;
if (virCgroupV1AllowDevice(group, 'c', -1, -1, perms) < 0)
return -1;
return 0;
}
static int
virCgroupV1DenyAllDevices(virCgroup *group)
{
return virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_DEVICES,
"devices.deny",
"a");
}
static int
virCgroupV1SetCpuShares(virCgroup *group,
unsigned long long shares)
{
if (shares < VIR_CGROUP_CPU_SHARES_MIN ||
shares > VIR_CGROUP_CPU_SHARES_MAX) {
virReportError(VIR_ERR_INVALID_ARG,
_("shares '%llu' must be in range [%llu, %llu]"),
shares,
VIR_CGROUP_CPU_SHARES_MIN,
VIR_CGROUP_CPU_SHARES_MAX);
return -1;
}
if (group->unitName) {
GVariant *value = g_variant_new("t", shares);
return virCgroupSetValueDBus(group->unitName, "CPUShares", value);
} else {
return virCgroupSetValueU64(group,
VIR_CGROUP_CONTROLLER_CPU,
"cpu.shares", shares);
}
}
static int
virCgroupV1GetCpuShares(virCgroup *group,
unsigned long long *shares)
{
return virCgroupGetValueU64(group,
VIR_CGROUP_CONTROLLER_CPU,
"cpu.shares", shares);
}
static int
virCgroupV1SetCpuCfsPeriod(virCgroup *group,
unsigned long long cfs_period)
{
if (cfs_period < VIR_CGROUP_CPU_PERIOD_MIN ||
cfs_period > VIR_CGROUP_CPU_PERIOD_MAX) {
virReportError(VIR_ERR_INVALID_ARG,
_("cfs_period '%llu' must be in range (%llu, %llu)"),
cfs_period,
VIR_CGROUP_CPU_PERIOD_MIN,
VIR_CGROUP_CPU_PERIOD_MAX);
return -1;
}
return virCgroupSetValueU64(group,
VIR_CGROUP_CONTROLLER_CPU,
"cpu.cfs_period_us", cfs_period);
}
static int
virCgroupV1GetCpuCfsPeriod(virCgroup *group,
unsigned long long *cfs_period)
{
return virCgroupGetValueU64(group,
VIR_CGROUP_CONTROLLER_CPU,
"cpu.cfs_period_us", cfs_period);
}
static int
virCgroupV1SetCpuCfsQuota(virCgroup *group,
long long cfs_quota)
{
if (cfs_quota >= 0 &&
(cfs_quota < VIR_CGROUP_CPU_QUOTA_MIN ||
cfs_quota > VIR_CGROUP_CPU_QUOTA_MAX)) {
virReportError(VIR_ERR_INVALID_ARG,
_("cfs_quota '%lld' must be in range (%llu, %llu)"),
cfs_quota,
VIR_CGROUP_CPU_QUOTA_MIN,
VIR_CGROUP_CPU_QUOTA_MAX);
return -1;
}
return virCgroupSetValueI64(group,
VIR_CGROUP_CONTROLLER_CPU,
"cpu.cfs_quota_us", cfs_quota);
}
static int
virCgroupV1GetCpuCfsQuota(virCgroup *group,
long long *cfs_quota)
{
return virCgroupGetValueI64(group,
VIR_CGROUP_CONTROLLER_CPU,
"cpu.cfs_quota_us", cfs_quota);
}
static bool
virCgroupV1SupportsCpuBW(virCgroup *cgroup)
{
g_autofree char *path = NULL;
if (!cgroup)
return false;
if (virCgroupV1PathOfController(cgroup, VIR_CGROUP_CONTROLLER_CPU,
"cpu.cfs_period_us", &path) < 0) {
virResetLastError();
return false;
}
return virFileExists(path);
}
static int
virCgroupV1GetCpuacctUsage(virCgroup *group,
unsigned long long *usage)
{
return virCgroupGetValueU64(group,
VIR_CGROUP_CONTROLLER_CPUACCT,
"cpuacct.usage", usage);
}
static int
virCgroupV1GetCpuacctPercpuUsage(virCgroup *group,
char **usage)
{
return virCgroupGetValueStr(group, VIR_CGROUP_CONTROLLER_CPUACCT,
"cpuacct.usage_percpu", usage);
}
static int
virCgroupV1GetCpuacctStat(virCgroup *group,
unsigned long long *user,
unsigned long long *sys)
{
g_autofree char *str = NULL;
char *p;
static double scale = -1.0;
if (virCgroupGetValueStr(group, VIR_CGROUP_CONTROLLER_CPUACCT,
"cpuacct.stat", &str) < 0)
return -1;
if (!(p = STRSKIP(str, "user ")) ||
virStrToLong_ull(p, &p, 10, user) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Cannot parse user stat '%s'"),
p);
return -1;
}
if (!(p = STRSKIP(p, "\nsystem ")) ||
virStrToLong_ull(p, NULL, 10, sys) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Cannot parse sys stat '%s'"),
p);
return -1;
}
/* times reported are in system ticks (generally 100 Hz), but that
* rate can theoretically vary between machines. Scale things
* into approximate nanoseconds. */
if (scale < 0) {
long ticks_per_sec = sysconf(_SC_CLK_TCK);
if (ticks_per_sec == -1) {
virReportSystemError(errno, "%s",
_("Cannot determine system clock HZ"));
return -1;
}
scale = 1000000000.0 / ticks_per_sec;
}
*user *= scale;
*sys *= scale;
return 0;
}
static int
virCgroupV1SetFreezerState(virCgroup *group,
const char *state)
{
return virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_FREEZER,
"freezer.state", state);
}
static int
virCgroupV1GetFreezerState(virCgroup *group,
char **state)
{
return virCgroupGetValueStr(group,
VIR_CGROUP_CONTROLLER_FREEZER,
"freezer.state", state);
}
static int
virCgroupV1SetCpusetMems(virCgroup *group,
const char *mems)
{
return virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_CPUSET,
"cpuset.mems",
mems);
}
static int
virCgroupV1GetCpusetMems(virCgroup *group,
char **mems)
{
return virCgroupGetValueStr(group,
VIR_CGROUP_CONTROLLER_CPUSET,
"cpuset.mems",
mems);
}
static int
virCgroupV1SetCpusetMemoryMigrate(virCgroup *group,
bool migrate)
{
return virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_CPUSET,
"cpuset.memory_migrate",
migrate ? "1" : "0");
}
static int
virCgroupV1GetCpusetMemoryMigrate(virCgroup *group,
bool *migrate)
{
unsigned long long value = 0;
int ret = virCgroupGetValueU64(group,
VIR_CGROUP_CONTROLLER_CPUSET,
"cpuset.memory_migrate",
&value);
*migrate = !!value;
return ret;
}
static int
virCgroupV1SetCpusetCpus(virCgroup *group,
const char *cpus)
{
return virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_CPUSET,
"cpuset.cpus",
cpus);
}
static int
virCgroupV1GetCpusetCpus(virCgroup *group,
char **cpus)
{
return virCgroupGetValueStr(group,
VIR_CGROUP_CONTROLLER_CPUSET,
"cpuset.cpus",
cpus);
}
virCgroupBackend virCgroupV1Backend = {
.type = VIR_CGROUP_BACKEND_TYPE_V1,
.available = virCgroupV1Available,
.validateMachineGroup = virCgroupV1ValidateMachineGroup,
.copyMounts = virCgroupV1CopyMounts,
.copyPlacement = virCgroupV1CopyPlacement,
.detectMounts = virCgroupV1DetectMounts,
.detectPlacement = virCgroupV1DetectPlacement,
.setPlacement = virCgroupV1SetPlacement,
.validatePlacement = virCgroupV1ValidatePlacement,
.stealPlacement = virCgroupV1StealPlacement,
.detectControllers = virCgroupV1DetectControllers,
.hasController = virCgroupV1HasController,
.getAnyController = virCgroupV1GetAnyController,
.pathOfController = virCgroupV1PathOfController,
.makeGroup = virCgroupV1MakeGroup,
.exists = virCgroupV1Exists,
.remove = virCgroupV1Remove,
.addTask = virCgroupV1AddTask,
.hasEmptyTasks = virCgroupV1HasEmptyTasks,
.killRecursive = virCgroupV1KillRecursive,
.bindMount = virCgroupV1BindMount,
.setOwner = virCgroupV1SetOwner,
.setBlkioWeight = virCgroupV1SetBlkioWeight,
.getBlkioWeight = virCgroupV1GetBlkioWeight,
.getBlkioIoServiced = virCgroupV1GetBlkioIoServiced,
.getBlkioIoDeviceServiced = virCgroupV1GetBlkioIoDeviceServiced,
.setBlkioDeviceWeight = virCgroupV1SetBlkioDeviceWeight,
.getBlkioDeviceWeight = virCgroupV1GetBlkioDeviceWeight,
.setBlkioDeviceReadIops = virCgroupV1SetBlkioDeviceReadIops,
.getBlkioDeviceReadIops = virCgroupV1GetBlkioDeviceReadIops,
.setBlkioDeviceWriteIops = virCgroupV1SetBlkioDeviceWriteIops,
.getBlkioDeviceWriteIops = virCgroupV1GetBlkioDeviceWriteIops,
.setBlkioDeviceReadBps = virCgroupV1SetBlkioDeviceReadBps,
.getBlkioDeviceReadBps = virCgroupV1GetBlkioDeviceReadBps,
.setBlkioDeviceWriteBps = virCgroupV1SetBlkioDeviceWriteBps,
.getBlkioDeviceWriteBps = virCgroupV1GetBlkioDeviceWriteBps,
.setMemory = virCgroupV1SetMemory,
.getMemoryStat = virCgroupV1GetMemoryStat,
.getMemoryUsage = virCgroupV1GetMemoryUsage,
.setMemoryHardLimit = virCgroupV1SetMemoryHardLimit,
.getMemoryHardLimit = virCgroupV1GetMemoryHardLimit,
.setMemorySoftLimit = virCgroupV1SetMemorySoftLimit,
.getMemorySoftLimit = virCgroupV1GetMemorySoftLimit,
.setMemSwapHardLimit = virCgroupV1SetMemSwapHardLimit,
.getMemSwapHardLimit = virCgroupV1GetMemSwapHardLimit,
.getMemSwapUsage = virCgroupV1GetMemSwapUsage,
.allowDevice = virCgroupV1AllowDevice,
.denyDevice = virCgroupV1DenyDevice,
.allowAllDevices = virCgroupV1AllowAllDevices,
.denyAllDevices = virCgroupV1DenyAllDevices,
.setCpuShares = virCgroupV1SetCpuShares,
.getCpuShares = virCgroupV1GetCpuShares,
.setCpuCfsPeriod = virCgroupV1SetCpuCfsPeriod,
.getCpuCfsPeriod = virCgroupV1GetCpuCfsPeriod,
.setCpuCfsQuota = virCgroupV1SetCpuCfsQuota,
.getCpuCfsQuota = virCgroupV1GetCpuCfsQuota,
.supportsCpuBW = virCgroupV1SupportsCpuBW,
.getCpuacctUsage = virCgroupV1GetCpuacctUsage,
.getCpuacctPercpuUsage = virCgroupV1GetCpuacctPercpuUsage,
.getCpuacctStat = virCgroupV1GetCpuacctStat,
.setFreezerState = virCgroupV1SetFreezerState,
.getFreezerState = virCgroupV1GetFreezerState,
.setCpusetMems = virCgroupV1SetCpusetMems,
.getCpusetMems = virCgroupV1GetCpusetMems,
.setCpusetMemoryMigrate = virCgroupV1SetCpusetMemoryMigrate,
.getCpusetMemoryMigrate = virCgroupV1GetCpusetMemoryMigrate,
.setCpusetCpus = virCgroupV1SetCpusetCpus,
.getCpusetCpus = virCgroupV1GetCpusetCpus,
};
void
virCgroupV1Register(void)
{
virCgroupBackendRegister(&virCgroupV1Backend);
}
#else /* !__linux__ */
void
virCgroupV1Register(void)
{
VIR_INFO("Control groups not supported on this platform");
}
#endif /* !__linux__ */
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