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diff --git a/src/db/update/Walk.hxx b/src/db/update/Walk.hxx
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+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_UPDATE_WALK_HXX
+#define MPD_UPDATE_WALK_HXX
+
+#include "check.h"
+#include "Editor.hxx"
+#include "Compiler.h"
+
+#include <sys/stat.h>
+
+struct stat;
+struct FileInfo;
+struct Directory;
+struct ArchivePlugin;
+class Storage;
+class ExcludeList;
+
+class UpdateWalk final {
+#ifdef ENABLE_ARCHIVE
+ friend class UpdateArchiveVisitor;
+#endif
+
+#ifndef WIN32
+ static constexpr bool DEFAULT_FOLLOW_INSIDE_SYMLINKS = true;
+ static constexpr bool DEFAULT_FOLLOW_OUTSIDE_SYMLINKS = true;
+
+ bool follow_inside_symlinks;
+ bool follow_outside_symlinks;
+#endif
+
+ bool walk_discard;
+ bool modified;
+
+ /**
+ * Set to true by the main thread when the update thread shall
+ * cancel as quickly as possible. Access to this flag is
+ * unprotected.
+ */
+ volatile bool cancel;
+
+ Storage &storage;
+
+ DatabaseEditor editor;
+
+public:
+ UpdateWalk(EventLoop &_loop, DatabaseListener &_listener,
+ Storage &_storage);
+
+ /**
+ * Cancel the current update and quit the Walk() method as
+ * soon as possible.
+ */
+ void Cancel() {
+ cancel = true;
+ }
+
+ /**
+ * Returns true if the database was modified.
+ */
+ bool Walk(Directory &root, const char *path, bool discard);
+
+private:
+ gcc_pure
+ bool SkipSymlink(const Directory *directory,
+ const char *utf8_name) const;
+
+ void RemoveExcludedFromDirectory(Directory &directory,
+ const ExcludeList &exclude_list);
+
+ void PurgeDeletedFromDirectory(Directory &directory);
+
+ void UpdateSongFile2(Directory &directory,
+ const char *name, const char *suffix,
+ const FileInfo &info);
+
+ bool UpdateSongFile(Directory &directory,
+ const char *name, const char *suffix,
+ const FileInfo &info);
+
+ bool UpdateContainerFile(Directory &directory,
+ const char *name, const char *suffix,
+ const FileInfo &info);
+
+
+#ifdef ENABLE_ARCHIVE
+ void UpdateArchiveTree(Directory &parent, const char *name);
+
+ bool UpdateArchiveFile(Directory &directory,
+ const char *name, const char *suffix,
+ const FileInfo &info);
+
+ void UpdateArchiveFile(Directory &directory, const char *name,
+ const FileInfo &info,
+ const ArchivePlugin &plugin);
+
+
+#else
+ bool UpdateArchiveFile(gcc_unused Directory &directory,
+ gcc_unused const char *name,
+ gcc_unused const char *suffix,
+ gcc_unused const FileInfo &info) {
+ return false;
+ }
+#endif
+
+ bool UpdatePlaylistFile(Directory &directory,
+ const char *name, const char *suffix,
+ const FileInfo &info);
+
+ bool UpdateRegularFile(Directory &directory,
+ const char *name, const FileInfo &info);
+
+ void UpdateDirectoryChild(Directory &directory,
+ const char *name, const FileInfo &info);
+
+ bool UpdateDirectory(Directory &directory, const FileInfo &info);
+
+ /**
+ * Create the specified directory object if it does not exist
+ * already or if the #stat object indicates that it has been
+ * modified since the last update. Returns nullptr when it
+ * exists already and is unmodified.
+ *
+ * The caller must lock the database.
+ */
+ Directory *MakeDirectoryIfModified(Directory &parent, const char *name,
+ const FileInfo &info);
+
+ Directory *DirectoryMakeChildChecked(Directory &parent,
+ const char *uri_utf8,
+ const char *name_utf8);
+
+ Directory *DirectoryMakeUriParentChecked(Directory &root,
+ const char *uri);
+
+ void UpdateUri(Directory &root, const char *uri);
+};
+
+#endif