--- libvirt-0.7.1/src/qemu_driver.c	2010-06-17 11:30:54.501983000 -0400
+++ new/src/qemu_driver.c	2010-06-17 11:20:13.032900000 -0400
@@ -69,7 +69,7 @@
 #include "hostusb.h"
 #include "security.h"
 #include "cgroup.h"
-
+#include "storage_file.h"
 
 #define VIR_FROM_THIS VIR_FROM_QEMU
 
@@ -1895,6 +1895,7 @@ static int qemuDomainSetDeviceOwnership(
 {
     uid_t uid;
     gid_t gid;
+    const char *path;
 
     if (!driver->privileged)
         return 0;
@@ -1912,6 +1913,35 @@ static int qemuDomainSetDeviceOwnership(
             (def->data.disk->readonly || def->data.disk->shared))
             return 0;
 
+        if (!def->data.disk->src)
+            return 0;
+
+        path = def->data.disk->src;
+        do {
+            virStorageFileMetadata meta;
+            int ret;
+
+            memset(&meta, 0, sizeof(meta));
+
+            ret = virStorageFileGetMetadata(conn, path, &meta);
+
+            if (path != def->data.disk->src)
+                VIR_FREE(path);
+            path = NULL;
+
+            if (ret < 0)
+                return -1;
+
+            if (meta.backingStore != NULL &&
+                qemuDomainSetFileOwnership(conn,
+                                           meta.backingStore, uid, gid) < 0) {
+                VIR_FREE(meta.backingStore);
+                return -1;
+            }
+
+            path = meta.backingStore;
+        } while (path != NULL);
+
         return qemuDomainSetFileOwnership(conn, def->data.disk->src, uid, gid);
 
     case VIR_DOMAIN_DEVICE_HOSTDEV:
@@ -1929,6 +1959,7 @@ static int qemuDomainSetAllDeviceOwnersh
     int i;
     uid_t uid;
     gid_t gid;
+    const char *path;
 
     if (!driver->privileged)
         return 0;
@@ -1949,6 +1980,35 @@ static int qemuDomainSetAllDeviceOwnersh
             (def->disks[i]->readonly || def->disks[i]->shared))
             continue;
 
+        if (!def->disks[i]->src)
+            continue;
+
+        path = def->disks[i]->src;
+        do {
+            virStorageFileMetadata meta;
+            int ret;
+
+            memset(&meta, 0, sizeof(meta));
+
+            ret = virStorageFileGetMetadata(conn, path, &meta);
+
+            if (path != def->disks[i]->src)
+                VIR_FREE(path);
+            path = NULL;
+
+            if (ret < 0)
+                return -1;
+
+            if (meta.backingStore != NULL &&
+                qemuDomainSetFileOwnership(conn,
+                                           meta.backingStore, uid, gid) < 0) {
+                VIR_FREE(meta.backingStore);
+                return -1;
+            }
+
+            path = meta.backingStore;
+        } while (path != NULL);
+
         if (qemuDomainSetFileOwnership(conn, def->disks[i]->src, uid, gid) < 0)
             return -1;
     }