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Revert "cgroup/LXC: Do not condition availability of v2 by controllers"

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This reverts commit e49313b54e.
This reverts commit a0f37232b9.

Revert them together to not break build.

This fix of the issue is incorrect and breaks usage of other controllers
in hybrid mode that systemd creates, specifically usage of devices and
cpuacct controllers as they are now assumed to be part of the cgroup v2
topology which is not true.

We need to find different solution to the issue.

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Pavel Hrdina 2022-10-25 11:34:43 +02:00
parent 122064d449
commit 76c6e91402
2 changed files with 17 additions and 4 deletions
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6
src/util/vircgroup.c
View File

@ -2921,12 +2921,10 @@ int
virCgroupBindMount(virCgroup *group, const char *oldroot,
const char *mountopts)
{
ssize_t i;
size_t i;
virCgroup *parent = virCgroupGetNested(group);
/* In hybrid environments, V2 may be mounted over V1.
* Mount the backends in reverse order. */
for (i = VIR_CGROUP_BACKEND_TYPE_LAST - 1; i >= 0; i--) {
for (i = 0; i < VIR_CGROUP_BACKEND_TYPE_LAST; i++) {
if (parent->backends[i] &&
parent->backends[i]->bindMount(parent, oldroot, mountopts) < 0) {
return -1;

15
src/util/vircgroupv2.c
View File

@ -69,13 +69,28 @@ virCgroupV2Available(void)
return false;
while (getmntent_r(mounts, &entry, buf, sizeof(buf)) != NULL) {
g_autofree char *contFile = NULL;
g_autofree char *contStr = NULL;
if (STRNEQ(entry.mnt_type, "cgroup2"))
continue;
/* Systemd uses cgroup v2 for process tracking but no controller is
* available. We should consider this configuration as cgroup v2 is
* not available. */
contFile = g_strdup_printf("%s/cgroup.controllers", entry.mnt_dir);
if (virFileReadAll(contFile, 1024 * 1024, &contStr) < 0)
goto cleanup;
if (STREQ(contStr, ""))
continue;
ret = true;
break;
}
cleanup:
VIR_FORCE_FCLOSE(mounts);
return ret;
}