packagefs: ioctls for getting and changing package activation

* Add PACKAGE_FS_OPERATION_GET_PACKAGE_INFOS which returns the node refs
  of all packages activated.
* Add PACKAGE_FS_OPERATION_CHANGE_ACTIVATION to activate/deactivate
  multiple packages.

headers/private/package/packagefs.h

@@ -21,10 +21,14 @@ enum PackageFSMountType {
 
 
 enum {
-	PACKAGE_FS_OPERATION_GET_VOLUME_INFO	= B_DEVICE_OP_CODES_END + 1
+	PACKAGE_FS_OPERATION_GET_VOLUME_INFO		= B_DEVICE_OP_CODES_END + 1,
+	PACKAGE_FS_OPERATION_GET_PACKAGE_INFOS,
+	PACKAGE_FS_OPERATION_CHANGE_ACTIVATION
 };
 
 
+// PACKAGE_FS_OPERATION_GET_VOLUME_INFO
+
 struct PackageFSVolumeInfo {
 	PackageFSMountType	mountType;
 
@@ -32,6 +36,55 @@ struct PackageFSVolumeInfo {
 	// for the three standard volumes)
 	dev_t				rootDeviceID;
 	ino_t				rootDirectoryID;
+
+	// device and node id of the volume's packages directory
+	dev_t				packagesDeviceID;
+	ino_t				packagesDirectoryID;
+};
+
+
+// PACKAGE_FS_OPERATION_GET_PACKAGE_INFOS
+
+struct PackageFSPackageInfo {
+	// node_ref of the package file
+	dev_t							packageDeviceID;
+	ino_t							packageNodeID;
+};
+
+struct PackageFSGetPackageInfosRequest {
+	// Filled in by the FS. packageCount is set to the actual package count,
+	// even if it is greater than the array, so the caller can determine whether
+	// the array was large enough.
+	uint32							packageCount;
+	PackageFSPackageInfo			infos[1];
+};
+
+
+// PACKAGE_FS_OPERATION_CHANGE_ACTIVATION
+
+enum PackageFSActivationChangeType {
+	PACKAGE_FS_ACTIVATE_PACKAGE,
+	PACKAGE_FS_DEACTIVATE_PACKAGE,
+	PACKAGE_FS_REACTIVATE_PACKAGE
+};
+
+struct PackageFSActivationChangeItem {
+	PackageFSActivationChangeType	type;
+
+	// node_ref of the package file
+	dev_t							packageDeviceID;
+	ino_t							packageNodeID;
+
+	// entry_ref of the package file
+	uint32							nameLength;
+	dev_t							parentDeviceID;
+	ino_t							parentDirectoryID;
+	char							name[1];
+};
+
+struct PackageFSActivationChangeRequest {
+	uint32							itemCount;
+	PackageFSActivationChangeItem	items[1];
 };