Increase size of driver table to make UML work again

The driver table only has 10 slots, but there are potentially
11 drivers that need activating. Improve the error message
when driver registration fails

* src/libvirt.c: Increase driver table size & improve errors

src/libvirt.c

@@ -79,7 +79,7 @@
  * - use reference counting to guarantee coherent pointer state ?
  */
 
-#define MAX_DRIVERS 10
+#define MAX_DRIVERS 20
 
 static virDriverPtr virDriverTab[MAX_DRIVERS];
 static int virDriverTabCount = 0;
@@ -523,7 +523,9 @@ virRegisterNetworkDriver(virNetworkDriverPtr driver)
     }
 
     if (virNetworkDriverTabCount >= MAX_DRIVERS) {
-        virLibConnError(VIR_ERR_INVALID_ARG, __FUNCTION__);
+        virLibConnError(VIR_ERR_INTERNAL_ERROR,
+                        _("Too many drivers, cannot register %s"),
+                        driver->name);
         return(-1);
     }
 
@@ -554,7 +556,9 @@ virRegisterInterfaceDriver(virInterfaceDriverPtr driver)
     }
 
     if (virInterfaceDriverTabCount >= MAX_DRIVERS) {
-        virLibConnError(VIR_ERR_INVALID_ARG, __FUNCTION__);
+        virLibConnError(VIR_ERR_INTERNAL_ERROR,
+                        _("Too many drivers, cannot register %s"),
+                        driver->name);
         return(-1);
     }
 
@@ -585,7 +589,9 @@ virRegisterStorageDriver(virStorageDriverPtr driver)
     }
 
     if (virStorageDriverTabCount >= MAX_DRIVERS) {
-        virLibConnError(VIR_ERR_INVALID_ARG, __FUNCTION__);
+        virLibConnError(VIR_ERR_INTERNAL_ERROR,
+                        _("Too many drivers, cannot register %s"),
+                        driver->name);
         return(-1);
     }
 
@@ -616,7 +622,9 @@ virRegisterDeviceMonitor(virDeviceMonitorPtr driver)
     }
 
     if (virDeviceMonitorTabCount >= MAX_DRIVERS) {
-        virLibConnError(VIR_ERR_INVALID_ARG, __FUNCTION__);
+        virLibConnError(VIR_ERR_INTERNAL_ERROR,
+                        _("Too many drivers, cannot register %s"),
+                        driver->name);
         return(-1);
     }
 
@@ -647,7 +655,9 @@ virRegisterSecretDriver(virSecretDriverPtr driver)
     }
 
     if (virSecretDriverTabCount >= MAX_DRIVERS) {
-        virLibConnError(VIR_ERR_INVALID_ARG, __FUNCTION__);
+        virLibConnError(VIR_ERR_INTERNAL_ERROR,
+                        _("Too many drivers, cannot register %s"),
+                        driver->name);
         return(-1);
     }
 
@@ -678,7 +688,9 @@ virRegisterNWFilterDriver(virNWFilterDriverPtr driver)
     }
 
     if (virNWFilterDriverTabCount >= MAX_DRIVERS) {
-        virLibConnError(VIR_ERR_INVALID_ARG, __FUNCTION__);
+        virLibConnError(VIR_ERR_INTERNAL_ERROR,
+                        _("Too many drivers, cannot register %s"),
+                        driver->name);
         return -1;
     }
 
@@ -712,7 +724,9 @@ virRegisterDriver(virDriverPtr driver)
     }
 
     if (virDriverTabCount >= MAX_DRIVERS) {
-        virLibConnError(VIR_ERR_INVALID_ARG, __FUNCTION__);
+        virLibConnError(VIR_ERR_INTERNAL_ERROR,
+                        _("Too many drivers, cannot register %s"),
+                        driver->name);
         return(-1);
     }
 
@@ -750,7 +764,9 @@ virRegisterStateDriver(virStateDriverPtr driver)
     }
 
     if (virStateDriverTabCount >= MAX_DRIVERS) {
-        virLibConnError(VIR_ERR_INVALID_ARG, __FUNCTION__);
+        virLibConnError(VIR_ERR_INTERNAL_ERROR,
+                        _("Too many drivers, cannot register %s"),
+                        driver->name);
         return(-1);
     }