diff --git a/Makefile.am b/Makefile.am
index cb7dafa1b..2e5d8b613 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -410,6 +410,7 @@ libfs_a_SOURCES = \
 	src/fs/TextFile.cxx src/fs/TextFile.hxx \
 	src/fs/FileSystem.cxx src/fs/FileSystem.hxx \
 	src/fs/StandardDirectory.cxx src/fs/StandardDirectory.hxx \
+	src/fs/CheckFile.cxx src/fs/CheckFile.hxx \
 	src/fs/DirectoryReader.hxx
 
 # Storage library
diff --git a/src/Mapper.cxx b/src/Mapper.cxx
index e6d7c3900..be58b49c9 100644
--- a/src/Mapper.cxx
+++ b/src/Mapper.cxx
@@ -26,16 +26,9 @@
 #include "fs/AllocatedPath.hxx"
 #include "fs/Traits.hxx"
 #include "fs/Charset.hxx"
-#include "fs/FileSystem.hxx"
-#include "fs/DirectoryReader.hxx"
-#include "util/Domain.hxx"
-#include "Log.hxx"
+#include "fs/CheckFile.hxx"
 
 #include <assert.h>
-#include <sys/stat.h>
-#include <errno.h>
-
-static constexpr Domain mapper_domain("mapper");
 
 #ifdef ENABLE_DATABASE
 
@@ -53,37 +46,6 @@ static AllocatedPath music_dir_fs = AllocatedPath::Null();
  */
 static AllocatedPath playlist_dir_fs = AllocatedPath::Null();
 
-static void
-check_directory(const char *path_utf8, const AllocatedPath &path_fs)
-{
-	struct stat st;
-	if (!StatFile(path_fs, st)) {
-		FormatErrno(mapper_domain,
-			    "Failed to stat directory \"%s\"",
-			    path_utf8);
-		return;
-	}
-
-	if (!S_ISDIR(st.st_mode)) {
-		FormatError(mapper_domain,
-			    "Not a directory: %s", path_utf8);
-		return;
-	}
-
-#ifndef WIN32
-	const auto x = AllocatedPath::Build(path_fs, ".");
-	if (!StatFile(x, st) && errno == EACCES)
-		FormatError(mapper_domain,
-			    "No permission to traverse (\"execute\") directory: %s",
-			    path_utf8);
-#endif
-
-	const DirectoryReader reader(path_fs);
-	if (reader.HasFailed() && errno == EACCES)
-		FormatError(mapper_domain,
-			    "No permission to read directory: %s", path_utf8);
-}
-
 #ifdef ENABLE_DATABASE
 
 static void
@@ -93,9 +55,7 @@ mapper_set_music_dir(AllocatedPath &&path)
 
 	music_dir_fs = std::move(path);
 
-	const auto music_dir_utf8 = music_dir_fs.ToUTF8();
-
-	check_directory(music_dir_utf8.c_str(), music_dir_fs);
+	CheckDirectoryReadable(music_dir_fs);
 }
 
 #endif
@@ -107,8 +67,7 @@ mapper_set_playlist_dir(AllocatedPath &&path)
 
 	playlist_dir_fs = std::move(path);
 
-	const auto utf8 = playlist_dir_fs.ToUTF8();
-	check_directory(utf8.c_str(), playlist_dir_fs);
+	CheckDirectoryReadable(playlist_dir_fs);
 }
 
 void
diff --git a/src/fs/CheckFile.cxx b/src/fs/CheckFile.cxx
new file mode 100644
index 000000000..a35443674
--- /dev/null
+++ b/src/fs/CheckFile.cxx
@@ -0,0 +1,62 @@
+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "CheckFile.hxx"
+#include "Log.hxx"
+#include "config/ConfigError.hxx"
+#include "FileSystem.hxx"
+#include "Path.hxx"
+#include "AllocatedPath.hxx"
+#include "DirectoryReader.hxx"
+
+#include <errno.h>
+#include <sys/stat.h>
+
+void
+CheckDirectoryReadable(Path path_fs)
+{
+	struct stat st;
+	if (!StatFile(path_fs, st)) {
+		FormatErrno(config_domain,
+			    "Failed to stat directory \"%s\"",
+			    path_fs.c_str());
+		return;
+	}
+
+	if (!S_ISDIR(st.st_mode)) {
+		FormatError(config_domain,
+			    "Not a directory: %s", path_fs.c_str());
+		return;
+	}
+
+#ifndef WIN32
+	const auto x = AllocatedPath::Build(path_fs, ".");
+	if (!StatFile(x, st) && errno == EACCES)
+		FormatError(config_domain,
+			    "No permission to traverse (\"execute\") directory: %s",
+			    path_fs.c_str());
+#endif
+
+	const DirectoryReader reader(path_fs);
+	if (reader.HasFailed() && errno == EACCES)
+		FormatError(config_domain,
+			    "No permission to read directory: %s", path_fs.c_str());
+
+}
diff --git a/src/fs/CheckFile.hxx b/src/fs/CheckFile.hxx
new file mode 100644
index 000000000..00559647d
--- /dev/null
+++ b/src/fs/CheckFile.hxx
@@ -0,0 +1,34 @@
+/*
+ * 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_FS_CHECK_FILE_HXX
+#define MPD_FS_CHECK_FILE_HXX
+
+#include "check.h"
+
+class Path;
+
+/**
+ * Check whether the directory is readable and usable.  Logs a warning
+ * if there is a problem.
+ */
+void
+CheckDirectoryReadable(Path path_fs);
+
+#endif