libvirt/SOURCES/libvirt-vircgroup-detect-available-backend-for-cgroup.patch

From 81bf1dade08ee40a9ecc32f5d384fdf35e3edbf3 Mon Sep 17 00:00:00 2001
Message-Id: <81bf1dade08ee40a9ecc32f5d384fdf35e3edbf3@dist-git>
From: Pavel Hrdina <phrdina@redhat.com>
Date: Mon, 1 Jul 2019 17:06:24 +0200
Subject: [PATCH] vircgroup: detect available backend for cgroup
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

We need to update one test-case because now new cgroup object will be
created only if there is any cgroup backend available.

Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
(cherry picked from commit f60af21594801088fff217aebf33b58825bd8a80)

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1689297

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Message-Id: <2815d54d5cffdef81bf9a41136b2d6a7e1d75b55.1561993100.git.phrdina@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
---
 src/util/vircgroup.c     | 18 ++++++++++++++++++
 src/util/vircgrouppriv.h |  3 +++
 tests/vircgrouptest.c    | 38 +++-----------------------------------
 3 files changed, 24 insertions(+), 35 deletions(-)

diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c
index 47a3b9ed58..15d0cb65ac 100644
--- a/src/util/vircgroup.c
+++ b/src/util/vircgroup.c
@@ -711,10 +711,28 @@ virCgroupDetect(virCgroupPtr group,
                 virCgroupPtr parent)
 {
     int rc;
+    size_t i;
+    virCgroupBackendPtr *backends = virCgroupBackendGetAll();
 
     VIR_DEBUG("group=%p controllers=%d path=%s parent=%p",
               group, controllers, path, parent);
 
+    if (!backends)
+        return -1;
+
+    for (i = 0; i < VIR_CGROUP_BACKEND_TYPE_LAST; i++) {
+        if (backends[i] && backends[i]->available()) {
+            group->backend = backends[i];
+            break;
+        }
+    }
+
+    if (!group->backend) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("no cgroup backend available"));
+        return -1;
+    }
+
     if (parent) {
         if (virCgroupCopyMounts(group, parent) < 0)
             return -1;
diff --git a/src/util/vircgrouppriv.h b/src/util/vircgrouppriv.h
index 046c96c52c..2caa966fee 100644
--- a/src/util/vircgrouppriv.h
+++ b/src/util/vircgrouppriv.h
@@ -30,6 +30,7 @@
 # define __VIR_CGROUP_PRIV_H__
 
 # include "vircgroup.h"
+# include "vircgroupbackend.h"
 
 struct _virCgroupController {
     int type;
@@ -47,6 +48,8 @@ typedef virCgroupController *virCgroupControllerPtr;
 struct _virCgroup {
     char *path;
 
+    virCgroupBackendPtr backend;
+
     virCgroupController controllers[VIR_CGROUP_CONTROLLER_LAST];
 };
 
diff --git a/tests/vircgrouptest.c b/tests/vircgrouptest.c
index 5031a2973d..588a6e824d 100644
--- a/tests/vircgrouptest.c
+++ b/tests/vircgrouptest.c
@@ -114,16 +114,6 @@ const char *mountsAllInOne[VIR_CGROUP_CONTROLLER_LAST] = {
     [VIR_CGROUP_CONTROLLER_BLKIO] = "/not/really/sys/fs/cgroup",
     [VIR_CGROUP_CONTROLLER_SYSTEMD] = NULL,
 };
-const char *mountsLogind[VIR_CGROUP_CONTROLLER_LAST] = {
-    [VIR_CGROUP_CONTROLLER_CPU] = NULL,
-    [VIR_CGROUP_CONTROLLER_CPUACCT] = NULL,
-    [VIR_CGROUP_CONTROLLER_CPUSET] = NULL,
-    [VIR_CGROUP_CONTROLLER_MEMORY] = NULL,
-    [VIR_CGROUP_CONTROLLER_DEVICES] = NULL,
-    [VIR_CGROUP_CONTROLLER_FREEZER] = NULL,
-    [VIR_CGROUP_CONTROLLER_BLKIO] = NULL,
-    [VIR_CGROUP_CONTROLLER_SYSTEMD] = "/not/really/sys/fs/cgroup/systemd",
-};
 
 const char *links[VIR_CGROUP_CONTROLLER_LAST] = {
     [VIR_CGROUP_CONTROLLER_CPU] = "/not/really/sys/fs/cgroup/cpu",
@@ -147,17 +137,6 @@ const char *linksAllInOne[VIR_CGROUP_CONTROLLER_LAST] = {
     [VIR_CGROUP_CONTROLLER_SYSTEMD] = NULL,
 };
 
-const char *linksLogind[VIR_CGROUP_CONTROLLER_LAST] = {
-    [VIR_CGROUP_CONTROLLER_CPU] = NULL,
-    [VIR_CGROUP_CONTROLLER_CPUACCT] = NULL,
-    [VIR_CGROUP_CONTROLLER_CPUSET] = NULL,
-    [VIR_CGROUP_CONTROLLER_MEMORY] = NULL,
-    [VIR_CGROUP_CONTROLLER_DEVICES] = NULL,
-    [VIR_CGROUP_CONTROLLER_FREEZER] = NULL,
-    [VIR_CGROUP_CONTROLLER_BLKIO] = NULL,
-    [VIR_CGROUP_CONTROLLER_SYSTEMD] = NULL,
-};
-
 
 struct _detectMountsData {
     const char *file;
@@ -555,24 +534,13 @@ static int testCgroupNewForSelfLogind(const void *args ATTRIBUTE_UNUSED)
 {
     virCgroupPtr cgroup = NULL;
     int ret = -1;
-    const char *placement[VIR_CGROUP_CONTROLLER_LAST] = {
-        [VIR_CGROUP_CONTROLLER_CPU] = NULL,
-        [VIR_CGROUP_CONTROLLER_CPUACCT] = NULL,
-        [VIR_CGROUP_CONTROLLER_CPUSET] = NULL,
-        [VIR_CGROUP_CONTROLLER_MEMORY] = NULL,
-        [VIR_CGROUP_CONTROLLER_DEVICES] = NULL,
-        [VIR_CGROUP_CONTROLLER_FREEZER] = NULL,
-        [VIR_CGROUP_CONTROLLER_BLKIO] = NULL,
-        [VIR_CGROUP_CONTROLLER_SYSTEMD] = "/",
-    };
 
-    if (virCgroupNewSelf(&cgroup) < 0) {
-        fprintf(stderr, "Cannot create cgroup for self\n");
+    if (virCgroupNewSelf(&cgroup) == 0) {
+        fprintf(stderr, "Expected cgroup creation to fail.\n");
         goto cleanup;
     }
 
-    ret = validateCgroup(cgroup, "", mountsLogind, linksLogind, placement);
-
+    ret = 0;
  cleanup:
     virCgroupFree(&cgroup);
     return ret;
-- 
2.22.0