add QERR_BASE_NOT_FOUND

This qerror will be raised when a given streaming base (backing file)
cannot be found.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

qapi-schema.json

@@ -1493,6 +1493,7 @@
 #          If streaming is already active on this device, DeviceInUse
 #          If @device does not exist, DeviceNotFound
 #          If image streaming is not supported by this device, NotSupported
+#          If @base does not exist, BaseNotFound
 #
 # Since: 1.1
 ##

qerror.c

@@ -51,6 +51,10 @@ static const QErrorStringTable qerror_table[] = {
         .error_fmt = QERR_BAD_BUS_FOR_DEVICE,
         .desc      = "Device '%(device)' can't go on a %(bad_bus_type) bus",
     },
+    {
+        .error_fmt = QERR_BASE_NOT_FOUND,
+        .desc      = "Base '%(base)' not found",
+    },
     {
         .error_fmt = QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
         .desc      = "Block format '%(format)' used by device '%(name)' does not support feature '%(feature)'",

qerror.h

@@ -57,6 +57,9 @@ QError *qobject_to_qerror(const QObject *obj);
 #define QERR_BAD_BUS_FOR_DEVICE \
     "{ 'class': 'BadBusForDevice', 'data': { 'device': %s, 'bad_bus_type': %s } }"
 
+#define QERR_BASE_NOT_FOUND \
+    "{ 'class': 'BaseNotFound', 'data': { 'base': %s } }"
+
 #define QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED \
     "{ 'class': 'BlockFormatFeatureNotSupported', 'data': { 'format': %s, 'name': %s, 'feature': %s } }"