qemu: block: Don't lookup node names if they are already known

Move the check that skips node name detection if they are already
present earlier so that the hash table lookup is skipped.

diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
index 3437302dd15f933bc4c1b4e1efbde00896b2f26e..a3da80f88886060c8f5b03f8b75d6649c90ef1ec 100644 (file)
--- a/src/qemu/qemu_block.c
+++ b/src/qemu/qemu_block.c
@@ -272,13 +272,13 @@ qemuBlockDiskDetectNodes(virDomainDiskDefPtr disk,
     qemuBlockNodeNameBackingChainDataPtr entry = NULL;
     virStorageSourcePtr src = disk->src;
 
-    if (!(entry = virHashLookup(disktable, disk->info.alias)))
-        return 0;
-
     /* don't attempt the detection if the top level already has node names */
     if (src->nodeformat || src->nodestorage)
         return 0;
 
+    if (!(entry = virHashLookup(disktable, disk->info.alias)))
+        return 0;
+
     while (src && entry) {
         if (src->nodeformat || src->nodestorage) {
             if (STRNEQ_NULLABLE(src->nodeformat, entry->nodeformat) ||