[PATCHv4 05/18] util: Refactor code for determining allocation path

[Wang Huaqiang <huaqiang.wang@xxxxxxxxx>]

The code for determining resctrl allocation path could be reused
for monitor. Refactor it for reusing.

Signed-off-by: Wang Huaqiang <huaqiang.wang@xxxxxxxxx>
---
 src/util/virresctrl.c | 33 +++++++++++++++++++++++++++------
 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index f2c94d2..5beed92 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -2269,6 +2269,26 @@ virResctrlAllocAssign(virResctrlInfoPtr resctrl,
 }
 
 
+static char *
+virResctrlDeterminePath(const char *pathparent,
+                        const char *prefix,
+                        const char *id)
+{
+    char *path = NULL;
+
+    if (!id) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("Resctrl resource ID must be set before creation"));
+        return NULL;
+    }
+
+    if (virAsprintf(&path, "%s/%s-%s", pathparent, prefix, id) < 0)
+        return NULL;
+
+    return path;
+}
+
+
 int
 virResctrlAllocDeterminePath(virResctrlAllocPtr alloc,
                              const char *machinename)
@@ -2276,15 +2296,16 @@ virResctrlAllocDeterminePath(virResctrlAllocPtr alloc,
     if (!alloc)
         return 0;
 
-    if (!alloc->id) {
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                       _("Resctrl Allocation ID must be set before creation"));
+    if (alloc->path) {
+        virReportError(VIR_ERR_INVALID_ARG, "%s",
+                       _("Resctrl group path is expected to be NULL"));
         return -1;
     }
 
-    if (!alloc->path &&
-        virAsprintf(&alloc->path, "%s/%s-%s",
-                    SYSFS_RESCTRL_PATH, machinename, alloc->id) < 0)
+    alloc->path = virResctrlDeterminePath(SYSFS_RESCTRL_PATH,
+                                          machinename,
+                                          alloc->id);
+    if (!alloc->path)
         return -1;
 
     return 0;
-- 
2.7.4

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