[libvirt] [PATCH v3 07/15] vircgroup: introduce virCgroupV2DevicesRemoveProg

[Pavel Hrdina]

We need to close our FD that we have for BPF program and map in order
to let kernel remove all resources once the cgroup is removed as well.

Signed-off-by: Pavel Hrdina <phrdina at redhat.com>
---
 src/libvirt_private.syms      |  1 +
 src/util/vircgroupv2.c        |  3 +++
 src/util/vircgroupv2devices.c | 26 ++++++++++++++++++++++++++
 src/util/vircgroupv2devices.h |  3 +++
 4 files changed, 33 insertions(+)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 9ab07de06d..f42bdad9ef 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1658,6 +1658,7 @@ virCgroupV2DevicesAvailable;
 virCgroupV2DevicesCreateProg;
 virCgroupV2DevicesDetectProg;
 virCgroupV2DevicesPrepareProg;
+virCgroupV2DevicesRemoveProg;
 
 # util/virclosecallbacks.h
 virCloseCallbacksGet;
diff --git a/src/util/vircgroupv2.c b/src/util/vircgroupv2.c
index dc7573e05c..ce19169fe7 100644
--- a/src/util/vircgroupv2.c
+++ b/src/util/vircgroupv2.c
@@ -448,6 +448,9 @@ virCgroupV2Remove(virCgroupPtr group)
     if (virCgroupV2PathOfController(group, controller, "", &grppath) < 0)
         return 0;
 
+    if (virCgroupV2DevicesRemoveProg(group) < 0)
+        return -1;
+
     return virCgroupRemoveRecursively(grppath);
 }
 
diff --git a/src/util/vircgroupv2devices.c b/src/util/vircgroupv2devices.c
index e8c6f74091..70e29b8470 100644
--- a/src/util/vircgroupv2devices.c
+++ b/src/util/vircgroupv2devices.c
@@ -551,6 +551,25 @@ virCgroupV2DevicesPrepareProg(virCgroupPtr group)
 
     return 0;
 }
+
+
+int
+virCgroupV2DevicesRemoveProg(virCgroupPtr group)
+{
+    if (virCgroupV2DevicesDetectProg(group) < 0)
+        return -1;
+
+    if (group->unified.devices.progfd <= 0 && group->unified.devices.mapfd <= 0)
+        return 0;
+
+    if (group->unified.devices.mapfd >= 0)
+        VIR_FORCE_CLOSE(group->unified.devices.mapfd);
+
+    if (group->unified.devices.progfd >= 0)
+        VIR_FORCE_CLOSE(group->unified.devices.progfd);
+
+    return 0;
+}
 #else /* !HAVE_DECL_BPF_CGROUP_DEVICE */
 bool
 virCgroupV2DevicesAvailable(virCgroupPtr group ATTRIBUTE_UNUSED)
@@ -599,4 +618,11 @@ virCgroupV2DevicesPrepareProg(virCgroupPtr group ATTRIBUTE_UNUSED)
                            "with this kernel"));
     return -1;
 }
+
+
+int
+virCgroupV2DevicesRemoveProg(virCgroupPtr group ATTRIBUTE_UNUSED)
+{
+    return 0;
+}
 #endif /* !HAVE_DECL_BPF_CGROUP_DEVICE */
diff --git a/src/util/vircgroupv2devices.h b/src/util/vircgroupv2devices.h
index 10c80c8ae4..ae02f9c334 100644
--- a/src/util/vircgroupv2devices.h
+++ b/src/util/vircgroupv2devices.h
@@ -38,4 +38,7 @@ virCgroupV2DevicesCreateProg(virCgroupPtr group);
 int
 virCgroupV2DevicesPrepareProg(virCgroupPtr group);
 
+int
+virCgroupV2DevicesRemoveProg(virCgroupPtr group);
+
 #endif /* LIBVIRT_VIRCGROUPV2DEVICES_H */
-- 
2.20.1