[libvirt] [PATCH] Allow rbd backing stores

[Peter Feiner]

Prevents libvirt from treating RBD backing stores as files. Without this
patch,
creating a domain with a qcow2 overlay on an RBD would fail.

This patch essentially extends 9c7c4a4fc533598e59e9a0038ec783e61a38e664,
which allows nbd backing stores, to allow rbd backing stores.

diff --git a/src/util/storage_file.c b/src/util/storage_file.c
index f38aa8e..101518a 100644
--- a/src/util/storage_file.c
+++ b/src/util/storage_file.c
@@ -589,8 +589,8 @@ virStorageFileMatchesVersion(int format,
 static bool
 virBackingStoreIsFile(const char *backing)
 {
-    /* Backing store is a network block device */
-    if (STRPREFIX(backing, "nbd:"))
+    /* Backing store is a network block device or Rados block device */
+    if (STRPREFIX(backing, "nbd:") || STRPREFIX(backing, "rbd:"))
         return false;
     return true;
 }
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