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vircgroup: extract virCgroupV1Available

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Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
This commit is contained in:
Pavel Hrdina 2018-09-13 16:27:56 +02:00
parent 1f221d610d
commit 57d35b72c9
3 changed files with 50 additions and 20 deletions
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28
src/util/vircgroup.c
View File

@ -47,6 +47,7 @@
#include "virutil.h"
#include "viralloc.h"
#include "vircgroupbackend.h"
#include "virerror.h"
#include "virlog.h"
#include "virfile.h"
@ -60,8 +61,6 @@
VIR_LOG_INIT("util.cgroup");
#define CGROUP_MAX_VAL 512
#define VIR_FROM_THIS VIR_FROM_CGROUP
#define CGROUP_NB_TOTAL_CPU_STAT_PARAM 3
@ -128,29 +127,18 @@ virCgroupGetDevicePermsString(int perms)
bool
virCgroupAvailable(void)
{
bool ret = false;
FILE *mounts = NULL;
struct mntent entry;
char buf[CGROUP_MAX_VAL];
size_t i;
virCgroupBackendPtr *backends = virCgroupBackendGetAll();
if (!virFileExists("/proc/cgroups"))
if (!backends)
return false;
if (!(mounts = fopen("/proc/mounts", "r")))
return false;
while (getmntent_r(mounts, &entry, buf, sizeof(buf)) != NULL) {
/* We're looking for at least one 'cgroup' fs mount,
* which is *not* a named mount. */
if (STREQ(entry.mnt_type, "cgroup") &&
!strstr(entry.mnt_opts, "name=")) {
ret = true;
break;
}
for (i = 0; i < VIR_CGROUP_BACKEND_TYPE_LAST; i++) {
if (backends[i] && backends[i]->available())
return true;
}
VIR_FORCE_FCLOSE(mounts);
return ret;
return false;
}

7
src/util/vircgroupbackend.h
View File

@ -25,14 +25,21 @@
# include "vircgroup.h"
# define CGROUP_MAX_VAL 512
typedef enum {
VIR_CGROUP_BACKEND_TYPE_V1 = 0,
VIR_CGROUP_BACKEND_TYPE_LAST,
} virCgroupBackendType;
typedef bool
(*virCgroupAvailableCB)(void);
struct _virCgroupBackend {
virCgroupBackendType type;
/* Mandatory callbacks that need to be implemented for every backend. */
virCgroupAvailableCB available;
};
typedef struct _virCgroupBackend virCgroupBackend;
typedef virCgroupBackend *virCgroupBackendPtr;

35
src/util/vircgroupv1.c
View File

@ -20,6 +20,10 @@
*/
#include <config.h>
#if defined HAVE_MNTENT_H && defined HAVE_GETMNTENT_R
# include <mntent.h>
#endif
#include "internal.h"
#define __VIR_CGROUP_ALLOW_INCLUDE_PRIV_H__
@ -29,6 +33,7 @@
#include "vircgroup.h"
#include "vircgroupbackend.h"
#include "vircgroupv1.h"
#include "virfile.h"
#include "virlog.h"
VIR_LOG_INIT("util.cgroup");
@ -43,8 +48,38 @@ VIR_ENUM_IMPL(virCgroupV1Controller, VIR_CGROUP_CONTROLLER_LAST,
"name=systemd");
/* 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;
}
virCgroupBackend virCgroupV1Backend = {
.type = VIR_CGROUP_BACKEND_TYPE_V1,
.available = virCgroupV1Available,
};