[libvirt] [PATCH v2 4/9] vircgroup: introduce virCgroupTaskFlags

[Pavel Hrdina]

Use flags in virCgroupAddTaskInternal instead of boolean parameter.
Following patch will add new flag to indicate thread instead of process.

Signed-off-by: Pavel Hrdina <phrdina at redhat.com>
---

Notes:
    changes in v2:
        - added comments for new flags

 src/util/vircgroup.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c
index 30ffb658d9..490cbc03a0 100644
--- a/src/util/vircgroup.c
+++ b/src/util/vircgroup.c
@@ -1152,8 +1152,21 @@ virCgroupNew(pid_t pid,
 }
 
 
+typedef enum {
+    /* Adds a whole process with all threads to specific cgroup except
+     * to systemd named controller. */
+    VIR_CGROUP_TASK_PROCESS = 0,
+
+    /* Same as VIR_CGROUP_TASK_PROCESS but it also adds the task to systemd
+     * named controller. */
+    VIR_CGROUP_TASK_SYSTEMD = 1 << 0,
+} virCgroupTaskFlags;
+
+
 static int
-virCgroupAddTaskInternal(virCgroupPtr group, pid_t pid, bool withSystemd)
+virCgroupAddTaskInternal(virCgroupPtr group,
+                         pid_t pid,
+                         unsigned int flags)
 {
     int ret = -1;
     size_t i;
@@ -1166,7 +1179,8 @@ virCgroupAddTaskInternal(virCgroupPtr group, pid_t pid, bool withSystemd)
         /* 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 && !withSystemd)
+        if (i == VIR_CGROUP_CONTROLLER_SYSTEMD &&
+            !(flags & VIR_CGROUP_TASK_SYSTEMD))
             continue;
 
         if (virCgroupSetValueI64(group, i, "tasks", pid) < 0)
@@ -1192,7 +1206,7 @@ virCgroupAddTaskInternal(virCgroupPtr group, pid_t pid, bool withSystemd)
 int
 virCgroupAddProcess(virCgroupPtr group, pid_t pid)
 {
-    return virCgroupAddTaskInternal(group, pid, false);
+    return virCgroupAddTaskInternal(group, pid, VIR_CGROUP_TASK_PROCESS);
 }
 
 /**
@@ -1209,7 +1223,9 @@ virCgroupAddProcess(virCgroupPtr group, pid_t pid)
 int
 virCgroupAddMachineProcess(virCgroupPtr group, pid_t pid)
 {
-    return virCgroupAddTaskInternal(group, pid, true);
+    return virCgroupAddTaskInternal(group, pid,
+                                    VIR_CGROUP_TASK_PROCESS |
+                                    VIR_CGROUP_TASK_SYSTEMD);
 }
 
 
-- 
2.17.1