packagefs: Add ioctl to get basic volume information

Also rename the MountType enum and members, since they are no longer
packagefs private.

headers/private/package/packagefs.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2013, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Ingo Weinhold <[email protected]>
+ */
+#ifndef _PACKAGE__PRIVATE__PACKAGE_FS_H_
+#define _PACKAGE__PRIVATE__PACKAGE_FS_H_
+
+
+#include <Drivers.h>
+
+
+enum PackageFSMountType {
+	PACKAGE_FS_MOUNT_TYPE_SYSTEM,
+	PACKAGE_FS_MOUNT_TYPE_COMMON,
+	PACKAGE_FS_MOUNT_TYPE_HOME,
+	PACKAGE_FS_MOUNT_TYPE_CUSTOM
+};
+
+
+enum {
+	PACKAGE_FS_OPERATION_GET_VOLUME_INFO	= B_DEVICE_OP_CODES_END + 1
+};
+
+
+struct PackageFSVolumeInfo {
+	PackageFSMountType	mountType;
+
+	// device and node id of the respective package FS root scope (e.g. "/boot"
+	// for the three standard volumes)
+	dev_t				rootDeviceID;
+	ino_t				rootDirectoryID;
+};
+
+
+#endif	// _PACKAGE__PRIVATE__PACKAGE_FS_H_