conf: accessors for common source information

A future patch will split virDomainDiskDef, in order to track
multiple host resources per guest <disk>.  To reduce the size
of that patch, I've factored out the four most common accesses
into functions, so that I can incrementally upgrade the code
base to use the accessors, and so that code that doesn't care
about the distinction of per-file details won't have to be
changed when the struct changes.

* src/conf/domain_conf.h (virDomainDiskGetType)
(virDomainDiskSetType, virDomainDiskGetSource)
(virDomainDiskSetSource, virDomainDiskGetDriver)
(virDomainDiskSetDriver, virDomainDiskGetFormat)
(virDomainDiskSetFormat): New prototypes.
* src/conf/domain_conf.c (virDomainDiskGetType)
(virDomainDiskSetType, virDomainDiskGetSource)
(virDomainDiskSetSource, virDomainDiskGetDriver)
(virDomainDiskSetDriver, virDomainDiskGetFormat)
(virDomainDiskSetFormat): Implement them.
* src/libvirt_private.syms (domain_conf.h): Export them.
Signed-off-by: NEric Blake <eblake@redhat.com>

src/conf/domain_conf.c

@@ -1354,6 +1354,20 @@ error:
 }
 
 
+int
+virDomainDiskGetType(virDomainDiskDefPtr def)
+{
+    return def->type;
+}
+
+
+void
+virDomainDiskSetType(virDomainDiskDefPtr def, int type)
+{
+    def->type = type;
+}
+
+
 int
 virDomainDiskGetActualType(virDomainDiskDefPtr def)
 {
@@ -1364,6 +1378,64 @@ virDomainDiskGetActualType(virDomainDiskDefPtr def)
 }
 
 
+const char *
+virDomainDiskGetSource(virDomainDiskDefPtr def)
+{
+    return def->src;
+}
+
+
+int
+virDomainDiskSetSource(virDomainDiskDefPtr def, const char *src)
+{
+    int ret;
+    char *tmp = def->src;
+
+    ret = VIR_STRDUP(def->src, src);
+    if (ret < 0)
+        def->src = tmp;
+    else
+        VIR_FREE(tmp);
+    return ret;
+}
+
+
+const char *
+virDomainDiskGetDriver(virDomainDiskDefPtr def)
+{
+    return def->driverName;
+}
+
+
+int
+virDomainDiskSetDriver(virDomainDiskDefPtr def, const char *name)
+{
+    int ret;
+    char *tmp = def->driverName;
+
+    ret = VIR_STRDUP(def->driverName, name);
+    if (ret < 0)
+        def->driverName = tmp;
+    else
+        VIR_FREE(tmp);
+    return ret;
+}
+
+
+int
+virDomainDiskGetFormat(virDomainDiskDefPtr def)
+{
+    return def->format;
+}
+
+
+void
+virDomainDiskSetFormat(virDomainDiskDefPtr def, int format)
+{
+    def->format = format;
+}
+
+
 void virDomainControllerDefFree(virDomainControllerDefPtr def)
 {
     if (!def)

src/conf/domain_conf.h

@@ -2256,7 +2256,17 @@ void virDomainDiskHostDefClear(virDomainDiskHostDefPtr def);
 void virDomainDiskHostDefFree(size_t nhosts, virDomainDiskHostDefPtr hosts);
 virDomainDiskHostDefPtr virDomainDiskHostDefCopy(size_t nhosts,
                                                  virDomainDiskHostDefPtr hosts);
+int virDomainDiskGetType(virDomainDiskDefPtr def);
+void virDomainDiskSetType(virDomainDiskDefPtr def, int type);
 int virDomainDiskGetActualType(virDomainDiskDefPtr def);
+const char *virDomainDiskGetSource(virDomainDiskDefPtr def);
+int virDomainDiskSetSource(virDomainDiskDefPtr def, const char *src)
+    ATTRIBUTE_RETURN_CHECK;
+const char *virDomainDiskGetDriver(virDomainDiskDefPtr def);
+int virDomainDiskSetDriver(virDomainDiskDefPtr def, const char *name)
+    ATTRIBUTE_RETURN_CHECK;
+int virDomainDiskGetFormat(virDomainDiskDefPtr def);
+void virDomainDiskSetFormat(virDomainDiskDefPtr def, int format);
 int virDomainDeviceFindControllerModel(virDomainDefPtr def,
                                        virDomainDeviceInfoPtr info,
                                        int controllerType);

src/libvirt_private.syms

@@ -201,6 +201,10 @@ virDomainDiskFindByBusAndDst;
 virDomainDiskGeometryTransTypeFromString;
 virDomainDiskGeometryTransTypeToString;
 virDomainDiskGetActualType;
+virDomainDiskGetDriver;
+virDomainDiskGetFormat;
+virDomainDiskGetSource;
+virDomainDiskGetType;
 virDomainDiskHostDefClear;
 virDomainDiskHostDefCopy;
 virDomainDiskHostDefFree;
@@ -215,6 +219,10 @@ virDomainDiskProtocolTransportTypeToString;
 virDomainDiskProtocolTypeToString;
 virDomainDiskRemove;
 virDomainDiskRemoveByName;
+virDomainDiskSetDriver;
+virDomainDiskSetFormat;
+virDomainDiskSetSource;
+virDomainDiskSetType;
 virDomainDiskSourceIsBlockType;
 virDomainDiskTypeFromString;
 virDomainDiskTypeToString;